Skocz do pozycji: 1.

Tytuł:

Study on pre-concentration efficiency of wolframite from tungsten ore using gravity and magnetic separations

Autorzy:

Lu, D.
Wang, Y.
Jiang, T.
Sun, W.
Hu, Y.

Powiązania:

https://bibliotekanauki.pl/articles/109597.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

tungsten ore
pre-concentration
separation efficiency
gravity separation
magnetic separation

Opis:

Pre-concentration is effectively applied in recovering wolframite from tungsten ore, due to its benefits of further upgrading tungsten ore and improving separation efficiency. The most important pre-concentration techniques for tungsten ore include gravity separation and magnetic separation, based on the fact that there are appreciable differences, between the desired wolframite and the gangue minerals, in density and magnetic susceptibility. This study investigated the separation efficiency of gravity pre-concentration (Falcon Concentrator) and high-gradient magnetic pre-concentration (SLon VPHGMS) for the beneficiation of a Canada tungsten ore. It is a low-grade type of ore with high silica and arsenic content, and an average content of WO3 is about 0.45%. The optimum conditions for different operational parameters of two pre-concentration separators were studied on this low-grade material. The results presented in this paper suggested that although both pre-concentration techniques were effective for producing pre-concentrates containing high WO3, magnetic pre-concentration showed significantly better separation efficiency. Over 90% of the feed was rejected as the final tailings, meanwhile, over 85% of arsenic minerals were removed with tailings, while the WO3 loss was less than 15%.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 718-728
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

CAMERA SEPARATORIA, czyli krótka historia nauki o rozdzielaniu i uzasadnienie tytułu nowego czasopisma
CAMERA SEPARATORIA: short history of the separation science and ground for a new journal name

Autorzy:

Głód, B. K.
Kamiński, M.

Powiązania:

https://bibliotekanauki.pl/articles/92257.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach

Tematy:

nauka o rozdzielaniu
technologie rozdzielania
rozdzielanie
separation science
technology of separation
separation

Opis:

Od niedawna nauka o rozdzielaniu wyodrębniła się w odrębny dział nauki, mocno powiązany z techniką i technologią rozdzielania. W pracy przedstawiono krótką historię ich rozwoju oraz szczegółowy podział. W następnym numerze zamierzamy przedstawić wkład Polaków w ich rozwój.
Recently, the separation science has been rised (created). It is strongly associated with the technique as well as technology of separation. The paper presents a brief history of their development and a detailed division on the different sections and techniques. In the next issue we intend to present a contribution to the Polish scientists in their development.

Źródło:

Camera Separatoria; 2011, 3, 1; 17-32
2083-6392
2299-6265

Pojawia się w:

Camera Separatoria

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:

Recovery of Fe and V via selective reduction–magnetic separation of vanadium-titanium magnetite concentrate

Autorzy:

Liu, Liwei
Li, Guofeng
Zhao, Libing
Li, Jinpeng
Li, Yanfeng

Powiązania:

https://bibliotekanauki.pl/articles/2146847.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

vanadium-titanium magnetite concentrate
selective reduction
magnetic separation
Fe separation
V separation

Opis:

With the aim of separating Fe and V, a vanadium-titanium magnetite concentrate was selectively reduced, followed by magnetic separation. The processes accompanying reduction of the vanadium-titanium magnetite concentrate were investigated using thermodynamic simulation, experiments, scanning electron microscopy, and electron probe microanalysis. Appropriate reduction conditions and controlling the amount of CaCO3 promoted the reduction of Fe-containing minerals to metallic Fe. V was released from magnetite, ilmenite, and titanomagnetite, and was inhibited to reduce to metallic V, leading to V enrichment in the non-magnetic products in the form of oxides. Moreover, the Fe particles wrapped the slag phase when the amount of CaCO3 exceeded 8%, which is unfavourable for the magnetic separation of Fe and V. Magnetic products with an Fe content of 87.19%, Fe recovery of 82.62%, V content of 0.09% and non-magnetic products with a V content of 1.00% and a V recovery of 85.49% were obtained when the vanadium-titanium magnetite concentrate was reduced for 100 min at 1623 K with a C/O molar ratio of 2.5 and 8% CaCO3, followed by separating at a magnetic field strength of 85 mT.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 1; 50--62
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Kinetic separation curves based on process rate considerations

Autorzy:

Drzymala, J.
Ratajczak, T.
Kowalczuk, P. B.

Powiązania:

https://bibliotekanauki.pl/articles/110027.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

separation
flotation
kinetics
separation curves
process rate

Opis:

There are many graphical representations of separation results involving time as a crucial parameter determining the kinetics of a process. The graphical representations of results of separation are usually in the form of 2D plots relating two parameters which one of them is time. Time can also be utilized as a complex parameter such as a process rate. The plots involving time are called kinetic curves. Theoretically, the number of kinetic curves is infinite. The basic process kinetic curves, relating either yield (or recovery) and time can be modified to obtain numerous local and global efficiency curves. The global efficiency kinetic curves provide characteristic constants which do not change with the time and yield of a process. In this paper the local and global efficiency plots were created using experimental data which followed the so-called first order kinetics. It was shown that the integral 1st order kinetic equation provided the kinetic constant k which was numerically identical with the 1st order specific rate v, while their units were different (k, 1/min; v, %/(%·min). The global efficiency parameters plotted versus the maximum yield provided another type of plot, which can be called the limits kinetic curve. The limits kinetic curves are very useful for characterizing, quantification and classification of separation systems. The limits kinetic curves can be normalized providing one universal curve with a characteristic point, for instance, v50 indicating the specific rate (or kinetic) constant at the maximum recovery equal to 50%. The mathematical equation of the normalized limits kinetic curve was given in the paper.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 983-995
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

New composite polymer membranes for biogas separation

Autorzy:

Bojarska, M.
Szwast, M.
Piątkiewicz, W.

Powiązania:

https://bibliotekanauki.pl/articles/115604.pdf

Data publikacji:

2011

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

biogas
gas separation
membranes for gas separation

Opis:

Biogas can be used as an alternative energy source. Unfortunately presence of carbon dioxide in a composition of biogas makes compression and transportation difficult. In addition CO2 makes biogas lower calorific. That is why new methods for carbon dioxide separation from biogas are to be explored. Obtained results for polypropylene membranes modifications by polydimethylosiloxanes are presented in this paper.

Źródło:

Challenges of Modern Technology; 2011, 2, 1; 65-68
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Digital image processing (DIP) application on the evaluation of ironrich heavy mineral concentrates produced from river sand using a sequential mineral processing approach

Autorzy:

Terzi, Mert
Kursun, Ilgin
Cinar, Mustafa
Ozdemir, Orhan

Powiązania:

https://bibliotekanauki.pl/articles/1447186.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

gravity separation
magnetic separation
flotation
silica
iron
magnetitte

Opis:

In this study, the iron-rich heavy mineral concentrate production from river sand as a byproduct of an alternative resource by gravity, magnetic separation, and flotation methods were investigated in detail. For the physical separation of the sample and increasing the Fe2O3 content, a shaking table and a wet high-intensity magnetic separator were used, respectively. The gravity and magnetic separation experiments included rougher, cleaner, and scavenger circuits. In the flotation experiments, cationic flotation with ethylenediamine under acidic conditions, and anionic flotation with sodium oleate under alkaline conditions were performed. The iron and silica content of the products obtained were determined by digital image processing (DIP) methods and compared with the classical analytical procedures. Finally, a flow chart was proposed for the processing of the ore according to the optimum enrichment parameters were determined from the experiments. The results obtained in this study show that it is possible to produce an iron-rich heavy mineral concentrate with Fe2O3 grade and recovery rate of 79.13% and 57.81%, respectively, in addition to a potential feed for the production of quartz sand and feldspar concentrates.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 3; 21-35
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Characterization and beneficiation of iranian low-grade manganese ore

Autorzy:

Mehdilo, A.
Irannajad, M.
Hojjati-Rad, M. R.

Powiązania:

https://bibliotekanauki.pl/articles/110939.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrolusite
manganese ore
ore characterization
gravity separation
magnetic separation

Opis:

The mineralogical studies indicated that the Charagah ore deposit contains approximately 17% pyrolusite, 78% calcite and 3–4% quartz. Pyrolusite as a main valuable mineral is found in the forms of coarse and fine pyrolusites. The coarse grains pyrolusite with simple texture is liberated at 180 micrometers. Another kind of pyrolusite with particle size finer than 10 m is disseminated inside gangue phases. This kind of pyrolusite has important effect in beneficiation processes and can affect the manganese grade of the concentrate and its recovery negatively. By jigging machine a pre-concentrate with 20% MnO and a final tailing with about 13% manganese loss are obtained. Using tabling technique or wet high intensity magnetic separation (WHIMS) and also their combination with jigging machine, production of a final pyrolusite concentrate with suitable grade but average recovery is possible. By jigging-tabling a concentrate with – 500+45 m size fraction, 44.3% MnO and 61.3% recovery is obtained while jigging-WHIMS produces a concentrate containing 52.6% MnO with a recovery up to 56.6% and d80 = 180 m.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 725-741
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Struktura procesów separacji i sposoby analizy wyników separacji
Structure of separation processes and ways of analysis of separation results

Autorzy:

Drzymała, J.

Powiązania:

https://bibliotekanauki.pl/articles/319402.pdf

Data publikacji:

2005

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

procesy separacji
separacja
analiza wyników
separation processes
separation
result analysis

Opis:

W różnych dziedzinach mamy do czynienia z różnymi procesami separacji. Mogą one być proste lub skomplikowane, rzeczywiste lub wirtualne, czy też małe lub duże. Procesy separacji dostarczają dwóch lub więcej produktów i dotyczą jednego lub więcej składników. Separacja jest wynikiem działania sił porządkujących, rozpraszających oraz sił rozdzielających. Ponieważ procesy separacji powinny mieć podobną strukturę, istnieje potrzeba spójnego opisania jej organizacji oraz nomenklatury, którą można użyć do analizy, oceny i porównania procesów separacji i ich wyników. W tej pracy zaprezentowano i przedyskutowano sposoby analizy wyników separacji. Analiza została oparta na pogrupowaniu właściwości układów separacji na cztery rodziny takie jak nazwa, ilość oraz jakość składników, a także główna cecha wykorzystywana do separacji. Takie pogrupowanie i ich kombinacje dostarczają sześciu różnych dwuparametrowych sposobów analizy wyników separacji i ich form graficznych. Nazwano je jako: a) wzbogacanie (ilości względem jakości) , b) klasyfikacja (jakość względem wartości cechy), c) dystrybucja (ilość względem nazwy), d) rozdział (ilość względem nazwy), e) sortowanie (jakość względem nazwy), oraz f) opis. Zaprezentowana struktura układów separacji jest prosta i pozwala na lepsze rozumienie procesu separacji i jego ocenę, jak również porównanie różnych procesów separacji.
Various separation processes are encountered in different fields. They can be simple or complex, real or virtual, micro or macro. The separation processes involve two or more products and one or more components. The separation results from the action of ordering, disordering and splitting forces of separation systems. Since all separation processes have similar structure, there is a need for a self-consistent delineation of their organization and nomenclature that can be used for analysis, evaluation, and comparison of separation processes and their results. In the paper, structure and ways of analysis of separation results is presented and discussed. The analysis is based on grouping the properties of separation systems into four families that is name, quality, quantity of components, and the main property utilized for separation of the components. Such groupings and their combinations provide six different approaches that can be used for analysis of separation data and presenting them in a graphical form. They were termed as: a) upgrading (quality vs. quantity), b) classification (quality vs. feature value), c) distribution (quantity vs. feature value), d) splitting (quantity vs. name), e) sorting (quality vs. name), and f) description (feature value vs. name). The presented structure of separation systems is simple and provide a better understanding of separation process and their evaluation as well as comparison of different separation systems.

Źródło:

Inżynieria Mineralna; 2005, R. 6, nr 2, 2; 3-11
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Analysis of the pneumatic separation process of agricultural materials

Autorzy:

Panasiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/24769.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

aerodynamic property
air separation
crushed seed
separation process
protein
moisture content
agricultural material
lupin
pneumatic separation process
seed

Źródło:

International Agrophysics; 1999, 13, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Tworzenie i kategoryzacja parametrów separacji
Creation and categorization of separation parameters

Autorzy:

Drzymała, J.

Powiązania:

https://bibliotekanauki.pl/articles/318602.pdf

Data publikacji:

2002

Wydawca:

Polskie Towarzystwo Przeróbki Kopalin

Tematy:

parametry separacji
tworzenie parametrów separacji
kategoryzacja parametrów separacji
separation parameters
creation of separation parameters
categorization of separation parameters

Opis:

Różne wskaźniki nazywane jako indeks, wskaźnik, czynnik, liczba, efektywność, sprawność, uzysk, stopień, czy też współczynnik są stosowane do oceny procesów separacji. Ponieważ oparte są one o takie wielkości jak wychód i zawartość, a użyte osobno nie są przydatne do oceny procesu separacji, w istocie są one parametrami separacji. W tej pracy pokazano, że istnieje nieskończona liczba parametrów separacji. Mogą być one generowane za pomocą prostych wzorów i zasad stosując wychód, który charakteryzuje ilość produktu, oraz zawartości, które opisują jakość produktu separacji i nadawy. W tej pracy parametry separacji podzielono na grupy i cztery najważniejsze z nich scharakteryzowano. Parametry separacji mogą być łączone w pary, co pozwala na utworzenie nieskończonej liczby krzywych wzbogacania i klasyfikacji. Ponieważ dowolna para parametrów separacji zawiera w sobie te same informacje o procesie, nie jest możliwe powiedzieć, który parametr, przez innych autorów nazywany także indeksem czy efektywnością, jest lepszy.Tylko ich graficzne i matematyczne postacie są różne.
Different indicators referred to as indices, factors, numbers, ratios, efficiencies, recoveries, degrees, coefficients, etc. are used for evaluation of separation processes. Since they are based on yields and contents, and when used alone are not able to evaluate separation process, in fact all of them are separation parameters. It was shown in this paper that there is unlimited number of separation parameters. They can be generated by means of simple formulas and rules using yield, which characterizes the quantity, and the contents, which describe the quality of separation products and the feed. In this paper the separation parameters were divided into families and four most important groups were characterized and discussed in the paper. The separation parameters can be combined into pairs to create unlimited number of either upgrading or classification plots. Since any pair of separation parameters carries the same information about the process, it is not possible to say which parameter (by others also called index, efficiency, etc.) is better. Only their graphical and mathematical forms are different.

Źródło:

Inżynieria Mineralna; 2002, R. 3, nr 1, 1; 11-19
1640-4920

Pojawia się w:

Inżynieria Mineralna

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:

Vybor modeli dinamiki sploshnojj sredy dlja opisanija procsessov vibroseparirovanija semennykh smesejj
The choice of model for the dynamics of a fluid for the description of processes of vibrating separate seed mixtures

Autorzy:

Lukyanenko, V.

Powiązania:

https://bibliotekanauki.pl/articles/76667.pdf

Data publikacji:

2015

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

dynamics model
fluid
vibration
separation
mixture separation
seed
optimization
fluid mechanics

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 7
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:

Actinide ion exchange technology in the back end of the nuclear fuel cycle

Autorzy:

Navratil, J.
Wei, Y.

Powiązania:

https://bibliotekanauki.pl/articles/147559.pdf

Data publikacji:

2001

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

actinide separation and purification
adsorption and elution
ion-exchange resin
separation

Opis:

Ion exchange is used extensively in nuclear power technology, especially for uranium ore processing, removal of contaminants from power reactor waters and in the back end of the nuclear fuel cycle. In nuclear fuel reprocessing plants, ion exchange is used for the purification of actinide elements for further use, for the solidification of low- and medium-active waste solutions, and for the partitioning of high-level wastes. This paper reviews selected technological uses of ion exchange in these operations for recovery, separation and purification of selected actinides (Pu, U, Np, etc.). Recent research and development on ion exchange technologies for actinides are also summarized.

Źródło:

Nukleonika; 2001, 46, 2; 75-80
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Application of superconducting magnetic separation to an artificial mixture of chalcopyrite and molybdenite

Autorzy:

Li, Daokui
Kou, Jue
Sun, Chunbao
Yu, Baoqiang
Wang, Chao

Powiązania:

https://bibliotekanauki.pl/articles/110786.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnetic matrices
superconducting magnetic separation
buildup behavior
chalcopyrite and molybdenite separation

Opis:

Superconducting magnetic separation of chalcopyrite and molybdenite was studied, along with the effects of the magnetic flux density, slurry concentration, and pulsation amplitude on the separation. According to the force equilibrium model of magnetic particles that accumulated on magnetic matrices during the superconducting magnetic separation, the saturated buildup of magnetic particles was calculated. The saturated buildup of magnetic particles was an approximate fan ring and had a positive correlation with the background magnetic flux density. Superconducting magnetic separation tests results showed that a Mo concentrate with a Mo grade of 31.86% and recovery of 87.24% and a Cu concentrate with a Cu grade of 30.57% and recovery of 94.76% could be obtained. This verified the feasibility of separating mixed Cu and Mo minerals via superconducting magnetic separation.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 3; 597-604
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Separacja stała podczas trwania węzła małżeńskiego
La seprazione perpetua manente vincolo

Autorzy:

Dzierżon, Ginter

Powiązania:

https://bibliotekanauki.pl/articles/662993.pdf

Data publikacji:

2000

Wydawca:

Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie

Tematy:

separacja stała
permanent separation

Opis:

Questo articolo presenta lo sviluppo storico di quella istituzione. Fonti di diritto canonico indicano che l’adulterio è rimasto sempre la causa principale per una ricorso all’uso della seprazione conjugale. Esso è ritenuto un comportamemto fortamente turbativo della convivenza coniugale, dall punto di vista etico, personale e sociale. La separazione perpetua è considerata come un estremo ed eccezionale rimedio per salvaguardare il bene del coniuge innocente. Poiché le norme canonice sollecitano una disponibilita del coniuge innocente a un attegiamento di cristiana caritatevole compresione e al perdono verso il coniuge colpevole.

Źródło:

Ius Matrimoniale; 2000, 11, 5; 151-168
1429-3803
2353-8120

Pojawia się w:

Ius Matrimoniale

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

The issue of intellectual intuition in metaphysics

Autorzy:

Piętka, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/1070366.pdf

Data publikacji:

2020-12-31

Wydawca:

Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie

Tematy:

intuition
meaning
understanding
separation

Opis:

The article presents problems of intellectual intuition in metaphysics from a semiotic point of view. There are various types of intuition in philosophy: rational intuition, irrational intuition, and sensual intuition. All of them are immediate ways of cognition. Classical metaphysics uses intellectual intuition as its main method to find out and justify its statements. The main problem of intellectual intuition is an intersubjective approach to the object of metaphysics. The main aim of this paper is the objectivization and rationalization of intellectual intuition in language. The semantic notion of meaning and the pragmatic notion of understanding are the fundamental tools which are used to translate the issue of intuition from the subject-ma$er level into the language level. This operation allows to look at intuition in a non-psychological manner. It enables the objectivization of the method of intellectual intuition in the light of the understanding of meanings.

Źródło:

Studia Philosophiae Christianae; 2020, 56, S1; 165-185
0585-5470

Pojawia się w:

Studia Philosophiae Christianae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Separacja małżonków : instytucja funkcjonująca w polskim prawie rodzinnym i w prawie kanonicznym
La separazione dei coniugi - l’istituzione di diritto polacco e di diritto canonico

Autorzy:

Kasprzyk, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/663443.pdf

Data publikacji:

2003

Wydawca:

Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie

Tematy:

separacja małżonków
separacja w polskim prawie rodzinnym
separacja w prawie kanonicznym
separacja
separation of the spouses
separation in Polish family law
separation in canonical law
separation

Opis:

L’autore presenta l’istituzione della sparazione dei coniugi secondo il diritto polacco e il dritto canonico sottolineando il ruolo della separazione come uno strumento che serve a tutelare il vincolo matrimoniale.

Źródło:

Ius Matrimoniale; 2003, 14, 8; 87-118
1429-3803
2353-8120

Pojawia się w:

Ius Matrimoniale

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

New Pairwise Separation Axioms in Bitopological Spaces

Autorzy:

Arwini, Khadiga Ali
Almrtadi, Hanan Musbah

Powiązania:

https://bibliotekanauki.pl/articles/1030774.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

bitopological spaces
separation axioms

Opis:

Several pairwise concepts for bitopological spaces (BTS) have been studied by many researchers. In this paper we introduce new pairwise separation axioms p'-Ti (I = 0, 1, 2, 3, 4) and p'-Ri (I = 0, 1) in bitopological spaces, then we study their properties and their relations with the standard separation axioms in BTS.

Źródło:

World Scientific News; 2020, 145; 31-45
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Role of ore mineralogy in selecting beneficiation route for magnesite-dolomite separation

Autorzy:

Yehia, A.
Al-Wakeel, M.

Powiązania:

https://bibliotekanauki.pl/articles/110660.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnetic separation
refractory materials

Opis:

Characterization and beneficiation of magnesite-dolomite sample were performed. The role of ore mineralogy in selecting the most adequate concentration method for magnesite-dolomite separation was found to be detrimental. The microscopic analysis showed that dolomite is stained with goethite and lepidocrocite (weakly magnetic minerals), while magnesite is stained with hematite and magnetite (highly magnetic mineral). A dry magnetic separation technique was used to separate dolomite from magnesite. The magnetic separation of the sample resulted in a magnesite concentrate product assaying 1.12% CaO with 46.02% recovery and CaO/SiO2 molar ratio = 1.62. This magnesite product is suitable for basic refractory. Besides, middling fraction was produced, containing 44.63% magnesite and 10.95% dolomite. This product is suitable for making low-loss forsterite dielectrics.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 525-534
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Advanced sorting technologies and its potential in mineral processing
Zaawansowane technologie sortowania i ich zastosowanie w przeróbce surowców mineralnych

Autorzy:

Kolacz, J.

Powiązania:

https://bibliotekanauki.pl/articles/348599.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

separacja optyczna
separacja elektroniczna
sortowanie optyczne
optical separation
electronic separation
optical sorting

Opis:

A new optical sorting system based on a complex image analysis and high definition imaging has been developed by Comex. The image analysis is based on high definition image analysis, X-ray attenuation and advanced filtration tools. Different mineral properties are used to identify the processed material. The system is further combined with a high speed rejection mechanism based on FPGA technology and operating in real time conditions. This provides a minimal error when removing waste particles from the sorted material.
Nowy system sortowania optycznego oparty na złożonej analizie obrazu i obrazach wysokiej rozdzielczości został opracowany przez Comex. Analiza obrazu oparta jest na obrazach wysokiej rozdzielczości, tłumieniu promieni rentgenowskich oraz zaawansowanych narzędzi filtracyjnych. Różne właściwości minerałów zostały zastosowane w celu identyfikacji przerabianego materiału. System zaopatrzony został w mechanizm odrzucający wysokiej prędkości oparty na technologii FPGA oraz pracujący w warunkach czasu rzeczywistego. Pozwala to zminimalizować błąd przy usuwaniu ziaren odpadowych z sortowanego materiału.

Źródło:

AGH Journal of Mining and Geoengineering; 2012, 36, 4; 39-48
1732-6702

Pojawia się w:

AGH Journal of Mining and Geoengineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Matematicheskoe opisanie povedenija zernovok podsolnechnika v vozdushnom potoke razdelitelnykh ustanovok
Mathematical description of the behavior of sunflower kernels in the air flow separation units

Autorzy:

Kolodijj, A.
Kjurchev, S.

Powiązania:

https://bibliotekanauki.pl/articles/77957.pdf

Data publikacji:

2015

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

mathematical description
sunflower
productivity
sowing material
grain separation
air flow
separation
aspiration channel

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 9
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Analiza rozdziału w separatorze magnetycznym bębnowym
Analysis of separation in the drum magnetic separator

Autorzy:

Brożek, M.

Powiązania:

https://bibliotekanauki.pl/articles/216901.pdf

Data publikacji:

2009

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

separacja magnetyczna
separator bębnowy
pole magnetyczne
model rozdziału
prędkość separacji
magnetic separation
drum separator
magnetic field
separation model
separation rate constant

Opis:

Separatory magnetyczne bębnowe stanowią najbardziej rozpowszechniony typ separatorów stosowanych w procesach wzbogacania rud magnetytowych oraz regeneracji cieczy zawiesinowych w układach wzbogacania grawitacyjnego w cieczach zawiesinowych. Efekty wzbogacania są zależne od szeregu czynników, takich jak: wydajność separatora, zawartość części stałych w zawiesinie, natężenie pola magnetycznego w przestrzeni roboczej separatora, prędkość obrotowa bębna, uziarnienie nadawy oraz rozkład właściwości magnetycznych w nadawie. Ze względu na zjawisko flokulacji magnetycznej dla uzyskania produktów o określonej jakości stosuje się wielokrotne separacje czyszczące lub uzupełniające. W artykule wyznaczono charakterystykę przestrzeni roboczej separatora magnetycznego w postaci rozkładu pola magnetycznego i siły magnetycznej działającej na ziarno, określono optymalną wartość podziałki biegunów układu magnetycznego separatora. Z bilansu sił wyliczono wartość magnetycznej podziałowej przy wzbogacaniu na sucho oraz zawartość magnetytu w ziarnach podziałowych. Dla przeprowadzenia analizy rozdziału opracowano model wielokrotnego wzbogacenia w procesie ciągłym, uzyskując na jego podstawie ogólne wyrażenie na uzysk ziaren magnetycznych w produkcie magnetycznym po kilkukrotnych separacjach uzupełniających produktu niemagnetycznego oraz zależność zawartości składnika magnetycznego w produkcie niemagnetycznym od długości drogi separacji w pojedynczym stadium. Wykorzystując empiryczną zależność składnika magnetycznego w produkcie niemagnetycznym od liczby obrotów bębna, wyznaczono na podstawie modelu zależność stałej prędkości separacji składnika magnetycznego od liczby obrotów bębna.
Drum magnetic separators constitute the most common type of separators applied in the magnetic ore enrichment processes and in dense-medium recovery in the systems of gravitational enrichment in heavy medium suspensions. The separation effects depend on many factors, such as separator efficiency, content of solid parts in the suspension, magnetic field intensity in the separator working space, drum rotational speed, feed particle size and distribution of magnetic properties in the feed. Due to the phenomenon of magnetic flocculation, multiple cleaning or supplementing separations are used to obtain products of fixed quality. In the paper, by means of solving Laplace's equation in the polar system (Eqs 1 and 2), the author determined the characteristics of the working space in the magnetic separator in the form of magnetic field distribution (Eqs 9 and 13) and magnetic force acting upon the particle (Eqs 15a and 15b), determined the optimum value of pole pitch of the separator magnetic system (Eq 23). The dependence of pole pitch on particle size for two values of the drum radius was presented in Fig. 3. The value of magnetic separation susceptibility at dry enrichment was calculated from the force balance together with the content of magnetite in separation particles (Eqs 27 and 29, respectively). The model of multiple separation in the continuous process was elaborated in order to execute the separation analysis, obtaining a general expression for the recovery of magnetic particles in the magnetic products after several supplementing separations of the non-magnetic product (Eq 42) as well as the dependence of the content of magnetic component in the non-magnetic product upon the length of separation path in a single stage (Eq 50). In equation (42) and (50) denotes the separation rate constant of magnetic particles. Applying the empirical dependence of content of the magnetic component in the non-magnetic product upon the number of drum rotations the author, according to the model, determined the dependence of separation rate constant of the magnetic components upon the number of drum rotations. Figure 8 presents this dependence. The analysis of separation, presented in this article, is based upon heuristic considerations. Magnetic interactions between particles should be taken into account when calculating the dependence of the separation rate constant of the magnetic component upon the process efficiency. On the other hand, in order to determine the dependence of the separation rate constant upon the number of drum rotations, the separation process should be considered as a birth and death stochastic process in the continuous separation system.

Źródło:

Gospodarka Surowcami Mineralnymi; 2009, 25, 1; 65-83
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Aehrodinamicheskaja separacija semjan sel'skokhozjajjstvennykh kul'tur v malogabaritnykh ustrojjstvakh
Aerodynamic separation of seed of agricultural cultures is in small devices

Autorzy:

Volozhaninov, C.
Zavalijj, A.
Kuzovkin, O.

Powiązania:

https://bibliotekanauki.pl/articles/76966.pdf

Data publikacji:

2014

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

seed processing
aerodynamic separation
cleaning
separation
high quality
seed
agricultural culture
agricultural enterprise

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 5
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Is Separation of Powers a Useless Concept? Part II: Tripartite System Criticism and Application Problems

Autorzy:

Hapla, Martin

Powiązania:

https://bibliotekanauki.pl/articles/962410.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

Separation of powers
state functions
tripartite separation of powers
formalism
functionalism
political theory

Opis:

In this paper, the author raised the question of whether the separation of powers is a useless concept. It summarizes some critical arguments against the tripartite separation of powers. The paper deals with application issues related to the separation of powers and distinguishes several attitudes toward them, which it then analyses in more detail. Great attention is dedicated to formalism and functionalism. Eventually, the author wonders whether it would be better to innovate the idea of separation of powers, or to dismiss and replace it with some other principle. He concludes that the separation of powers has problems, but we need to evaluate this idea in relation to its possible alternatives. In such a light it still sounds promising.

Źródło:

Adam Mickiewicz University Law Review; 2019, 9
2450-0976

Pojawia się w:

Adam Mickiewicz University Law Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Filters and sequences

Autorzy:

Solecki, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/1205111.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

filters
separation property
Fatou's lemma

Opis:

We consider two situations which relate properties of filters with properties of the limit operators with respect to these filters. In the first one, we show that the space of sequences having limits with respect to a $Π^0_3$ filter is itself $Π^0_3$ and therefore, by a result of Dobrowolski and Marciszewski, such spaces are topologically indistinguishable. This answers a question of Dobrowolski and Marciszewski. In the second one, we characterize universally measurable filters which fulfill Fatou's lemma.

Źródło:

Fundamenta Mathematicae; 2000, 163, 3; 215-228
0016-2736

Pojawia się w:

Fundamenta Mathematicae

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Two mathematical formulas for assessing seed separation efficiency

Autorzy:

Kaliniewicz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/297999.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

seeds
separation process
indicators
comparison

Opis:

Two mathematical formulas for assessing the efficiency of seed mixture separation were analyzed. Increases in the crop seed yield and the efficiency of impurity separation were accompanied by higher seed separation efficiency regardless of the adopted formula. One of the examined formulas carried more information, and it could be used to determine the improvement in the purity of the separated product relative to the raw material. The difference in the analyzed formulas’ ability to determine the efficiency of seed separation was minimized when the separation process was more efficient, i.e. when the value of partial indicators of separation efficiency was closer to 1. Both formulas could be successfully used to describe seed separation efficiency because in most practical applications, the error generated by the evaluated formulas did not exceed 1.5%.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2013, 16(2); 109-117
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Flotation after a direct contact of flotation reagents with carbonate particles. Part 1, Model investigations

Autorzy:

Ahmed, H. A. M.
Aljuhani, M. S.
Drzymala, J.

Powiązania:

https://bibliotekanauki.pl/articles/109753.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

phosphates
flotation
microemulsion
separation Introduction

Opis:

Carbonate fluorapatite (francolite), calcite and dolomite separately, as well as their model mixtures, were subjected to flotation after conditioning the particles with microemulsion consisting of 20% of Custafloat AR27 (collector, blend of fatty acid soaps and sulfates), 55% fuel oil #5 and 25% water at 70% solids density and subsequent pulp dilution with water to 25% solids. The best separation of carbonate fluorapatite from calcite and dolomite occurred at pH 8.5 and microemulsion dose between 0.9 and 1.5 kg/Mg, 1.5 min conditioning time and 2 minutes of flotation time. The obtained flotation concentrates using 1.5 kg/Mg of collector contained 84% carbonate fluorapatite (34% P2O5) with 84% recovery. The 84/84 separation efficiency in terms of grade-recovery indices points to promising results which can be obtained for real phosphate ores.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 713-723
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Purification of halloysite by magnetic separation

Autorzy:

Sakiewicz, P.
Lutynski, M.
Soltys, J.
Pytlinski, A.

Powiązania:

https://bibliotekanauki.pl/articles/110768.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

halloysite
magnetic separation
HCl treatment

Opis:

Rational use of mineral resources requires advanced separation methods in order to obtain high quality products. In this study chemical treatment with magnetic separation of halloysite from Dunino (Poland) is presented. Initial crushing, hydrochloric acid absorption treatment, sedimentation (settling) and polygradient magnetic separation in weak magnetic field were applied to separate aluminosilicates from iron and titanium oxides (impurities). The process allowed to obtain a product of approximately 98% purity of the aluminosilicate fraction (halloysite + kaolinite). The tailings from magnetic separation consisted of iron oxides, while the intermediate product consisted mainly of aluminosilicate and iron chlorides resulting from the HCl treatment. The obtained products can be used as a component of polymer nanocomposites, sorbents and in ceramics industry.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 991-1001
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Impact of Sedimentation Supported by Coagulation Process on Effectiveness of Separation of the Solid Phase from Wastewater Stream

Autorzy:

Maciołek, P.
Szymański, K.
Schmidt, R.

Powiązania:

https://bibliotekanauki.pl/articles/123962.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

wastewater treatment
coagulation
flocculation
separation

Opis:

The objective of this work was to test the impact of coagulant and flocculant at the stage of mechanical wastewater treatment on the wastewater treatment plant operation, performed in the A2O process. In this paper, the principles of correct conduct of coagulation in wastewater treatment have been discussed. It appears from the research performed that significant elimination of BOD₅ such as 20÷30%, total suspended matter up to 90%, COD up to 50% and total nitrogen at 30% level was achieved supported by the coagulation process in the pre-settling tanks. Approximately 50% of phosphorus was eliminated after the mechanical part. Additionally, a significant impact of Superfloc flocculant on the effectiveness of the solid phase separation (activated sludge) in the secondary settling tank was noted under diversified flow conditions.

Źródło:

Journal of Ecological Engineering; 2018, 19, 6; 81-87
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Povyshenie proizvoditel'nosti vibracionnojj semjaochistitel'nojj mashiny s neperforirovannymi rabochimi ploskostjami
Increase of the productivity of oscillation machine for separation of seed with the unperforated workers planes

Autorzy:

Luk'janenko, V.
Galich, I.

Powiązania:

https://bibliotekanauki.pl/articles/77438.pdf

Data publikacji:

2013

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

machine
vibration
cleaning
seed
separation

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

The effects of the staff separation on employees, a case study of AMREF Kenya

Autorzy:

Wafula, Mathias Wesamba

Powiązania:

https://bibliotekanauki.pl/articles/1182804.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

AMREF Kenya
Staff separation process

Opis:

This paper assesses the effects of the staff separation process on the employees of AMREF Kenya. The Survey Research Design was used to carry out this study with the aim of accurately reflecting the real figure in the wider population of AMREF Kenya employees and to find out the effects of AMREF Kenya’s Separation Process towards the employees. The study population consisted of men and women who are employees of AMREF Kenya Country Office. The Systematic Random Sampling technique was used to obtain a sample size of 50 employees, 42 of whom participated in the study. Approval was sort by the Principal Investigator from the management of AMREF Kenya Country Office; a brief introduction and purpose of the study was given, and a written /oral consent to take part in the study was then obtained. This was followed by data collection using questionnaires that had both quantitative and qualitative properties. The questionnaires were collected after a month from all the 42 participants and were stored, then the data analyzed. Data entry was done during analysis where the questionnaires’ serial numbers were cross checked to confirm if all questionnaires were returned. Data entry was carried out using the Microsoft Excel package. The data was then edited to correct errors and verification was done to eliminate any discrepancies in the numbers entered. The data was summarized appropriately using means and proportions, and it was analyzed using the IBM SPSS version 20.0 where the findings were presented in tables and figures for easy interpretation. The findings show that majority of the separated staff were stressed as a result of their job loss; this was followed by financial difficulties, depression, poor health and family problems. The paper further shows that the employees of AMREF Kenya experienced high levels of uncertainty after layoffs; their trust towards management reduced; they were angered by layoffs and their loyalty towards the organization slightly reduced. Employee productivity and participation, and their confidence towards the management of AMREF Kenya worsened. It was concluded that the effects of the staff separation at AMREF Kenya negatively impacted on both the separated and retained staff. The findings show that separated employees face a plethora of challenges as a result of the layoff which affects their morale and way of life. The layoffs are also detrimental to the retained staff as they negatively affect their productivity, loyalty and confidence towards AMREF Kenya’s management thus causing them to seek for employment opportunities with job security in mind. The study recommended that AMREF’s management should carry out employee engagement surveys on a regular basis to find out the various implications that both the separated and retained staff experience as a result of the layoffs and ways to mitigate them.

Źródło:

World Scientific News; 2017, 65; 1-19
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

On Personal Security Issues of Soldiers from Polish Military Contingent in Iraq

Autorzy:

Żukowska, Irena

Powiązania:

https://bibliotekanauki.pl/articles/1861594.pdf

Data publikacji:

2016

Wydawca:

Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie

Tematy:

military family
mission
separation
Iraq

Opis:

Going on a mission undoubtedly constitutes a real threat to the stability of a military family. The fact of being temporarily separated, together with all the related emotional problems, seem to cause a number of dysfunctions in the partners’ relations. The departure of the spouse for a mission is an important social phenomenon which creates a new situation in which the widely acknowledged patterns of family behavior do not guarantee the fulfillment of the family’s needs. Hence, there is a necessity to renegotiate family roles and their scope. In the families of soldiers who go on a mission it is the wife who takes over all the duties and the responsibility for the family’s general wellbeing. They have to face the dull reality: paying the bills, making renovations and bringing up children. When back home, the soldiers take over the man’s responsibilities. From one moment to the next, they have to became fathers, husbands and the heads of their families again. Unfortunately, it is difficult for both spouses to cope with such a situation.

Źródło:

Security Dimensions; 2016, 17(17); 42-54
2353-7000

Pojawia się w:

Security Dimensions

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Influence of selected work parameters of the rolling screen operation on screening effects

Autorzy:

Gawenda, T.
Saramak, D.

Powiązania:

https://bibliotekanauki.pl/articles/110507.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

screen
screening
effectiveness
separation sharpness

Opis:

The paper deals with effectiveness of particle size separation. The investigations of limestone screening were run on a laboratory scale using a rolling screen. Batch tests were run for various batch outputs as well as different angles of deviation of motovibrators. Quantitative and qualitative effectiveness indices were calculated as well as the imperfection and probable error, which depend on the sieve mesh. A model of determining the screening effectiveness as a function of four independent variables: the amplitude of vertical vibrations of sieve decks (described by means of the angle of deviation of motovibrators), screening time, batch output and the mesh sizes of respective sieves was proposed. The results presented in the paper and the applied approach to stochastic modeling can be used under industrial conditions for rolling screens with variable dynamic parameters at different screening parameters.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 337-347
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Effect of depressants in the selective flotation of smithsonite and calcite using potassium lauryl phosphate as collector

Autorzy:

Sun, Qing
Feng, Qiming
Shi, Qing

Powiązania:

https://bibliotekanauki.pl/articles/110635.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

smithsonite
calcite
flotation
depressant
separation

Opis:

In order to selectively separate smithsonite and calcite using potassium lauryl phosphate as collector and reveal the depression mechanism, the approaches of micro-flotation and zeta potential measurements were adopted. The effects of sodium hexametaphosphate (SHMP), water glass (WG), carboxymethyl cellulose (CMC) and lignosulfonate calcium (LSC) as depressants on smithsonite and calcite have been studied through micro-flotation. The single mineral flotation tests show that LSC can depress calcite, but it has little effect on smithsonite flotation. Flotation separation of a mixture of smithsonite and calcite can be completed to obtain a zinc concentrate grade up to 33.85% Zn with a recovery of 70.06%. The zeta potential results illustrate that LSC has higher tendency to be adsorbed on the surface of calcite. However, there is little adsorption of LSC on smithsonite.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 89-96
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Utilization of aqueous-tar condensates formed during gasification

Autorzy:

Kwiecińska, A.
Iluk, T.
Kochel, M.

Powiązania:

https://bibliotekanauki.pl/articles/125021.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

gasification
wastewater
treatment
membrane separation

Opis:

Gasification of solid fuels is an alternative process for energy production using conventional and renewable fuels. Apart from desired compounds, i.e. carbon oxide, hydrogen and methane, the produced gas contains complex organic (tars) and inorganic (carbonizate, ammonia) contaminants. Those substances, together with water vapor, condensate during cooling of the process gas, what results in the formation of aqueous-tar condensate, which requires proper methods of utilization. The management of this stream is crucial for commercialization and application of the gasification technology. In the paper the treatment of aqueous-tar condensates formed during biomass gasification process is discussed. The removal of tars from the stream was based on their spontaneous separation. The aqueous stream was subjected to ultrafiltration operated at different pressures. Such a treatment configuration enabled to obtain highly concentrated retentate, which could be recycled to the gasifier, and filtrate, which could be subjected to further treatment.

Źródło:

Journal of Ecological Engineering; 2016, 17, 5; 132-137
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Effect of depressants in the selective flotation of smithsonite and calcite using cationic collector

Autorzy:

Liu, Hongjiang
Zhang, Guofan
Luo, Yuanjia

Powiązania:

https://bibliotekanauki.pl/articles/1449481.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

smithsonite
calcite
selective separation
depressant

Opis:

This work studied the effects of sodium hexametaphosphate (SHMP), tanning extract, water glass (WG) and calcium lignosulfonate (CLS) as depressants for the separation of smithsonite from calcite by using a cationic collector called octadecylamine acetate (ODA). Micro-flotation experimental tests showed that CLS can greatly and selectively depress calcite. When the dosages of CLS used were 20 and 40 mg/L, a concentrate with Zn grades of 42.54% and 49.32% and Zn recoveries of 81.66% and 68.00% was achieved in the flotation separation of mixed mineral (1:1 smithsonite:calcite). Zeta potential and adsorption measurements revealed that the adsorption of CLS on calcite’s surface was greater than that on smithsonite’s surface. When CLS was added, the adsorption of ODA was hindered greatly on the calcite’s surface but slightly on the smithsonite’s surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 1; 1-10
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Concentration Characteristics of a Complex Antimony Ore

Autorzy:

Gülcan, Ergin
Can, İlkay B.
Can, N. Metin
Ergün, Levent Ş.

Powiązania:

https://bibliotekanauki.pl/articles/109673.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

stibnite beneficiation
heavy medium separation
shaking table
electrostatic separation
ore sorting
modelling and simulation

Opis:

Selection of a proper concentration method for a sustainable production of antimony metal from an ore deposit has its unique challenges and crucial of importance due to the growing use of antimony compounds and increasing strategic importance. Therefore, detailed laboratory scale beneficiation studies of a complex stibnite ore and modeling & simulation studies based on the experimental results were investigated within this study. Quantitative mineralogical characterization, chemical analyses, sieve tests and the heavy liquid tests were performed in the scope of ore characterization. Froth flotation, gravity concentration, electrostatic separation and ore sorting were conducted to introduce the best possible flowsheet for the individual industrial sample. It was concluded that heavy medium separation would be the only method can be used for subjected stibnite ore. Therefore, four conjectural beneficiation scenarios were tested by simulation studies for the cases proposedly allowing to produce concentrates having 10, 12, 14 and 16% Sb content. Within the simulation studies substantiating the real-life processing operation in terms of realistic performance figures, flowsheet design covered the processing of -10+0.5 mm fraction and relatively fine sizes separately via heavy medium cyclone and shaking tables, respectively. Following the itemized mass and water balances, the simulation results showed that when the grade of the concentrates were requested in between 10-16%, the total recovery of the concentrates changed between 46-49% in case of feeding 1.18% Sb with 20 tones per hour feed rate.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 4; 823-839
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

A new approach in separation process evaluation. Efficiency ratio and upgrading curves

Autorzy:

Irannajad, M.
Nuri, O. S.
Allahkarami, E.

Powiązania:

https://bibliotekanauki.pl/articles/110189.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

separation efficiency
mineral processing
selectivity index
process evaluation
efficiency ratio
operation efficiency
Separation Process

Opis:

In mineral processing separation efficiency (SE), operation efficiency (OE), selectivity index (SI) and other indices have been used to evaluate the separation process. Up to now, no study has been conducted on the relationship between the SE, OE and SI indices. In this research, two upgrading curves are proposed based on the above indices for process and selectivity evaluation. The first upgrading curve is based on recovery R, SE, and OE as a function of concentrate grade. This curve has three background lines, including no upgrading line, ideal upgrading line and the ideal mixing line. The proposed upgrading curve is applicable not only for process evaluation by specification of OE and SE, but also for selectivity evaluation with the lowest difference between SE and OE. The curve showed that the recovery value is always greater than the SE and OE values. The parameters of OE, SE and R were used for plotting the upgrading curve as a function of concentrate grade taking into consideration all of them at a time. A new selectivity indicator, namely Efficiency Ratio (ER) as the selectivity parameter, is proposed as the ratio of OE to SE. The ER values fluctuate between 1 and . It can be presented as a function of concentrate and tailing grades (ER = [c(1-t)]/[1(c-t)]). The results showed that ER is insensitive to the feed grade and has the inverse relationship with SI. To measure the separation selectivity, another upgrading curve is proposed based on ER and SI parameters. This curve is divided into seven separation classes for evaluation the class of a separation process from ideal class to no separation one. The results of this research can be useful for separation process evaluation.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 847-857
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Teoreticheskoe obosnovanie kachestvennykh pokazatelejj processa pnevmoseparacii dlja mnogourovnevogo vvedenija zerna
The theoretical justification of air separation process quality factors for the multilevel grain introduction

Autorzy:

Nesterenko, A.
Leschenko, S.
Petrenko, D.
Bogatyrev, D.
Kislun, O.

Powiązania:

https://bibliotekanauki.pl/articles/77122.pdf

Data publikacji:

2013

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

air separation
feeder operator
grain mixture
grain introduction
air flow resistance
separation process
theoretical analysis

Opis:

The article is devoted to the theoretical analysis of the work of the aspirating channel with the feeder for the multilevel grain mixture introduction for the purpose of efficiency improving and air flow drag reduction. There are the formulas suggested for the definition of separation process quality factors and their connection with the main separator characteristics.

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Czy w dyskusji o separacji funkcjonalnej telekomunikacja może skorzystać z doświadczeń kolei?
Can Telecommunications Use the Experiences of Railways When Discussing Functional Separation?

Autorzy:

Król, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/508108.pdf

Data publikacji:

2015-10-31

Wydawca:

Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania

Tematy:

K23
separacja funkcjonalna
separacja strukturalna
telekomunikacja
transport kolejowy
functional separation
structural separation
telecommunications
railways

Opis:

W artykule podjęto próbę wskazania tych doświadczeń transportu kolejowego z separacją struk-turalną, które mogą być cenne dla telekomunikacji. W pierwszej części nakreślono kontekst rozważań. Drugą część poświęcono możliwości transferu doświadczeń związanych z separacją strukturalną między branżami infrastrukturalnymi. W trzeciej części sformułowano kluczowe dla telekomunikacji wnioski wynikające z doświadczenia kolei w tym zakresie.
The article aims to show these areas of experiences with structural separation in Railways which might prove useful for Telecommunications. The context of the analysis is presented in the first part of the paper. Part II discusses the possibility to transfer experiences with structural separation among infrastructure industries. Key conclusions for the Telecommunications sector regarding structural separation applied in Railways are identifi ed in the third part of the paper.

Źródło:

internetowy Kwartalnik Antymonopolowy i Regulacyjny; 2015, 4, 6; 18-27
2299-5749

Pojawia się w:

internetowy Kwartalnik Antymonopolowy i Regulacyjny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Technology of oxygen production in the membrane-cryogenic air separation system for a 600 MW oxy-type pulverized bed boiler

Autorzy:

Berdowska, S.
Skorek-Osikowska, A.

Powiązania:

https://bibliotekanauki.pl/articles/240451.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

kriogeniczny rozdział powietrza
membranowy separator
produkcja tlenu
cryogenic air separation
membrane air separation
oxygen production

Opis:

In this paper the results of the thermodynamic analysis of the oxy-combustion type pulverized bed boiler integrated with a hybrid, membrane-cryogenic oxygen separation installation are presented. For the calculations a 600 MW boiler with live steam parameters at 31.1 MPa /654.9[degrees]C and reheated steam at 6.15 MPa/672.4[degrees]C was chosen. In this paper the hybrid membrane-cryogenic technology as oxygen production unit for pulverized bed boiler was proposed. Such an installation consists of a membrane module and two cryogenic distillation columns. Models of these installations were built in the Aspen software. The energy intensity of the oxygen production process in the hybrid system was compared with the cryogenic technology. The analysis of the influence of membrane surface area on the energy intensity of the process of air separation as well as the influence of oxygen concentration at the inlet to the cryogenic installation on the energy intensity of a hybrid unit was performed.

Źródło:

Archives of Thermodynamics; 2012, 33, 3; 65-76
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant

Autorzy:

Zhou, Hepeng
Wu, Handan
Guo, Jiangfeng
Tang, Xuekun
Huang, Wen
Luo, Xianping

Powiązania:

https://bibliotekanauki.pl/articles/24086193.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

scheelite
calcite
inhibition mechanism
flotation separation

Opis:

It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Removal of iron from sandstone by magnetic separation and leaching: case of El-Aouana deposit (Algeria)

Autorzy:

Bouabdallah, S.
Bounouala, M.
Chaib, A. S.

Powiązania:

https://bibliotekanauki.pl/articles/89037.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

leaching
magnetic separation
sandstone
mineral processing

Opis:

To improve the quality of raw materials from North East Algeria and their application in the field of flat glass manufacturing, the sandstone of El-Aouana (Jijel) was subjected to a physicochemical characterization. Analysis techniques such as X-ray diffraction, atomic absorption spectrophotometry and a chemical analysis of size fractions by sieving were used. According to this characterization it is noticed that sandstone feedstock contains primarily quartz (SiO2), as well as ferriferous minerals considered as impurities during glass manufacturing. This work concerns the removal of iron oxide from silica sandstone to obtain a material acceptable for flat glass manufacturing. For this, we have studied the silica enrichment process using a magnetic separation. Moreover, a leaching process by using hydrochloric acid has been studied under various experimental conditions; the parameters studied were: hydrochloric concentration, temperature, and time of contact. The results obtained show that the leaching studied presents a better removal of iron oxide after 150 min of treatment at temperature 90°C with a 3 mol/L, a concentrate obtained final of 99.16% SiO2 with a content of 0.01% Fe2O3.

Źródło:

Mining Science; 2015, 22; 33-44
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Effective methods of chalcedonite processing

Autorzy:

Naziemiec, Zdzisław
Saramak, Daniel

Powiązania:

https://bibliotekanauki.pl/articles/2016525.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

chalcedonite
density separation
raw materials processing

Opis:

Chalcedonite is an unique mineral with high variability in its density, which may cause problems in its industrial utilization. This study was aimed to find more effective methods for chalcedonite processing based on density separation. The method presented in the paper has been patented, and the results from this study showed that separation product were of a higher quality. Products of density separation have also lower variations in their density values what may results in their more effective industrial utilization.

Źródło:

Mining Science; 2021, 28; 7-18
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Separation Axioms Weaker Than T1

Autorzy:

Arwini, Khadiga Ali
Almrgni, Mabrouka Mohammed

Powiązania:

https://bibliotekanauki.pl/articles/1030516.pdf

Data publikacji:

2020

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Subspaces
lower separation axioms
product spaces

Opis:

The purpose of this paper is to introduce a new type of separation axioms via dense sets, called DT_i-spaces (i = 0‚1/( 4) ‚1/( 3) ‚1/( 2)‚3/( 4)‚1), where a DT_i-space is a topological space which contains a dense T_i-subspace (i = 0‚1/( 4) ‚1/( 3) ‚ 1/( 2) ‚3/( 4)‚1). These new axioms are weaker than the axiom of T_□1. We provide the basic properties of DT_i- spaces (i = 0‚1/( 4)‚1/( 3) ‚1/( 2) ‚3/( 4)‚1), and we show that the axioms of DT_□((1 )/4), DT_□(1/3),〖 DT〗_□(1/2), DT_□(3/4), DT_□1 are open hereditary. Moreover, we study the connections between these axioms and the axioms of T_i where (i = 0‚1/( 4) ‚1/( 3) ‚1/( 2) ‚3/( 4)‚1).

Źródło:

World Scientific News; 2020, 144; 158-168
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Analysis of variations in and correlations between selected physical parameters of common beech (Fagus silvatica L.) nuts

Autorzy:

Kaliniewicz, Z.
Markowski, P.
Anders, A.
Tylek, P.
Krzysiak, Z.
Wasielewski, W.

Powiązania:

https://bibliotekanauki.pl/articles/298426.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

geometric parameters
mass
aspect ratio
separation

Opis:

The basic dimensions and the mass of common beech nuts and seeds from five nut batches, harvested from tree stands in northern Poland, were determined. Environmental conditions had a greater influence on seed plumpness than the age of tree stands. The results of measurements were analyzed statistically by analysis of variance, correlation analysis and linear regression analysis. Despite differences in their plumpness, nuts were characterized by nearly identical cross-sections which resembled an equilateral triangle. The thickness of nuts and seeds was highly correlated with their mass, and this information can facilitate seed husking and separation into mass categories. Before and after husking, seeds should be separated with the use of a mesh screen with longitudinal openings. Medium-sized (most numerous) seeds were separated into the following plumpness categories using a screen separator with ≠6 mm and ≠7 mm openings: 84% of moderately plump seeds, 3% of seeds with reduced plumpness, and 13% of plump seeds.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(1); 49-63
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Possibilities of recovery and separation of rare earth elements

Autorzy:

Fila, Dominika

Powiązania:

https://bibliotekanauki.pl/articles/2079965.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

rare earth elements
resources
recovery
separation

Opis:

Rare earth metals are a group of elements widely used in high technology products. They are included in the group of critical mineral resources for the EU economy. Rare earth elements are found in computers and mobile phones, as well as in low-emission energy technologies. They are also applied in chemical processes as catalysts in the oil refining. Some of them occur even in considerable quantities in the earth's crust but not very often in the concentrations justifying the profitability of their extraction. Additionally, the constantly growing demand and the current market situation cause that alternative resources of rare earth elements recovery are sought after. Therefore, the recovery and separation methods as well as recovery from the secondary sources are becoming more and more important. The following paper presents the possibilities of recovery and separation of rare earth elements from primary and secondary sources.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 99-110
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Consolidation of a porous multilayered subsoil undergoing large deformation
Konsolidacja wielowarstwowego podłoża porowatego w warunkach dużych deformacji

Autorzy:

Szefer, G.
Mikołajek, M.

Powiązania:

https://bibliotekanauki.pl/articles/281348.pdf

Data publikacji:

1998

Wydawca:

Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej

Tematy:

consolidation
porous skeleton
separation
large deformation

Opis:

In the paper the process of deformation of an elastic porous skeleton at finite strains and the associated transport of fluid through the pores is considered. Undergoing large deformations these coupled interaction phenomena require skilful analysis. Numerical results for a three-layered subsoil resting on a rigid foundation under different permeability conditions in the uni-axial state of strains are given.
W pracy rozważono proces deformacji porowatego szkieletu sprężystego przy skończonych odkształceniach oraz towarzyszącego transportu cieczy. W warunkach dużych deformacji te sprzężone zjawiska interakcji wymagają subtelnej analizy. Podano numeryczne rezultaty dla trójwarstwowego podłoża leżącego na sztywnym podkładzie przy różnych warunkach przepuszczalności w jednoosiowym stanie odkształcenia.

Źródło:

Journal of Theoretical and Applied Mechanics; 1998, 3; 759-773
1429-2955

Pojawia się w:

Journal of Theoretical and Applied Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Geopolitical position of Poland - from time of partitions to the independence

Autorzy:

Brudnicka, Jowita

Powiązania:

https://bibliotekanauki.pl/articles/526976.pdf

Data publikacji:

2016

Wydawca:

Collegium Civitas

Tematy:

Geopolitics
Polska
Middle Europe
unification/separation

Opis:

To understand contemporary geopolitics, especially Polish geopolitics you have to refer to the history. Polish geopolitical philosophy has flourished in a crucial period in the history of the country - the To understand contemporary geopolitics, especially Polish geopolitics you have to refer to the history. Polish geopolitical philosophy has flourished in a crucial period in the history of the country - the time of the fall of the First Republic and partitions. Sketch of Polish geopolitics is well composed into the broader plan of European thought. This is not just a simpple analitycal exercise. Article contains the suggestion, that the events, experiences and geopolitical configurations may exhibit amazing repeatability.

Źródło:

Securitologia; 2016, 1 (23); 87-102
1898-4509

Pojawia się w:

Securitologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

PARENT–CHILD SEPARATION IN ANGOLAN TRANSNATIONAL FAMILIES

Autorzy:

Marinho, Luena

Powiązania:

https://bibliotekanauki.pl/articles/579709.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

PARENT- CHILD SEPARATION
TRANSNATIONAL FAMILIES
MIGRATION

Opis:

Globalization increased the number of transnational families all over the world. The way of life created by transnationalism leads to changes in family relationships, creates a specific dynamics, implies care at distance and produces various forms of parenting. Starting from the analysis of transnational families between Angola and Portugal, the aim of this paper is to understand the effects of migration on parent-child relationship trying to perceive how parenting at a distance is conceived by the actors: migrant parents in Portugal and children in Angola. Drawing on interviews made with migrant parents and children, the paper explores the functioning of the parental relationship at distance.

Źródło:

Studia Migracyjne - Przegląd Polonijny; 2014, 40, 3(153); 187-202
2081-4488
2544-4972

Pojawia się w:

Studia Migracyjne - Przegląd Polonijny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

« Les marques » de l’absence dans le théâtre de Maurice Maeterlinck
« The Markers » of Absence in Maurice Maeterlinck’s Theater

Autorzy:

Enache, Eugenia

Powiązania:

https://bibliotekanauki.pl/articles/483550.pdf

Data publikacji:

2012

Wydawca:

Katolicki Uniwersytet Lubelski Jana Pawła II. Wydawnictwo Werset

Tematy:

absence
Maurice Maeterlinck
alienation
separation
death

Opis:

Our approach is focused on the issue of the “markers” of absence as well as on the expression and materialization of that absence in a corpus of works formed of the following plays: L’Intruse, Les Aveugles, Intérieur by Maurice Maeterlinck. The acceptions the concept of “absence” may receive throughout our analysis are parts of the phenomenon of progressive alienation seen, for instance, as separation (stressing the idea of distance and departure), or as solitude, then omission (in the sense of forgetting), and culminating with the inability of perception that anticipates isolation, physical imprisonment and announces death (designated through a privative prefix) as an absence that is always present and obscurity. We attempt to reveal the “markers” of absence on the level of certain constituents of the play: the character, formed of a discursive feature, infinitely simple and repetitive, much more diminished and developing without individuality, like a silent, mysterious ghost; and the action where it is rather inaction that represents our primary direction of research. As a secondary direction, we consider the markers of absence in a language that, in the case of Maeterlinck, is remarkably pure and lacks any syntactic or lexical complication, from lexical structures (the reassessment of short expressions makes the utterances seem captivatingly strange, revealing, beyond words, unutterable, unspeakable) and the grammar, especially the semantics of its forms – the 3rd person pronouns, a form we may consider as deprived of referential content, the indefinite pronouns which indicate absence –, the semantics of punctuation, especially that of the suspension points.

Źródło:

Quêtes littéraires; 2012, 2; 46-53
2084-8099
2657-487X

Pojawia się w:

Quêtes littéraires

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 51.

Tytuł:

Solvent extraction of copper(ii) from concentrated leach liquors

Autorzy:

Ochromowicz, K.
Chmielewski, T.

Powiązania:

https://bibliotekanauki.pl/articles/109873.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

copper ore
hydrometallurgy
separation
Acorga
LIX

Opis:

Hydrometallurgical treatment of complex copper sulfidic ores, by-products and concentrates requires aggressive, oxidative leaching methods and application of Fe(III) ions and oxygen or bacteria assisted environment. Leach liquors generated in the process are usually copper and iron-rich solutions of high acidity. Such conditions require the application of suitably strong and selective reagent to extract copper in SX operations. This paper discusses the copper extraction behavior of commercial copper rea-gents: LIX 984N, LIX 612N-LV and Acorga M5640. Aqueous feed solutions used in SX studies were PLS’ generated in atmospheric leaching of commercial flotation concentrate, produced at Lubin Concen-trator (KGHM). McCabe-Thiele diagrams were generated and copper net transfer values were compared and discussed. It was shown that stronger modified aldoxime reagents (Acorga, LIX 612) are superior over non-modified salicylaldoxime/ketoxime mixture (LIX 984N). Particularly, the ester modified Acor-ga M5640 showed advantages in recovery and copper net transfer values.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 1; 357-367
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 52.

Tytuł:

Research on the mechanism of a mixed collector onto magnesite surface to improve the flotation separation of magnesite from hornblende

Autorzy:

Wang, Enlei
Li, Xiaoan
Dai, Shujuan
Li, Zhao
Zhao, Tonglin
Song, Baoxu
Han, Baisui

Powiązania:

https://bibliotekanauki.pl/articles/1445774.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnesite
hornblende
mixed collector
flotation separation

Opis:

Low-grade magnesite is not effectively used mainly due to high silicon content, especially the separation of magnesite and hornblende. In this research, a novel mixture of sodium oleate and dodecyl phosphate collector was used to increase the flotation difference between magnesite and hornblende. Artificially mixed mineral concentrates grade 47.10% (MgO content) concentrate recovery of 84.45% was obtained by micro flotation test, the results showed that the mixed collector of sodium oleate and dodecyl phosphate played a better selective promotion role in the flotation of magnesite. The interaction mechanism of this mixed collector with hornblende and magnesite surfaces was investigated using Fourier transform infrared spectroscopy (FTIR), zeta potential, and X-ray photoelectron spectroscopy (XPS), which showed that the mixed collector in terms of magnesium selection was mainly adsorbed on these magnesium sites of magnesite, and the surface of magnesite thus became hydrophobic, allowing magnesite to float and separate from hornblende.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 4; 125-138
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 53.

Tytuł:

Recovery of pure palladium compound from the spent electroplating solutions by hydrometallurgical method

Autorzy:

Nguyen, Viet Nhan Hoa
Song, Si Jeong
Lee, Man Seung

Powiązania:

https://bibliotekanauki.pl/articles/2146854.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

leaching
solvent extraction
palladium
separation
precipitation

Opis:

Electroplating of palladium (Pd) is practiced in the manufacture of electronic materials. The increasing demand for Pd metal necessitates the recovery of Pd(II) from the spent electroplating solutions. In this work, the recovery of Pd compound was studied from the cemented Pd by zinc (Zn) metal from spent electroplating solutions. Initially, the selective extraction ability of ionic liquids synthesized from commercial extractants for Pd(II) over Zn(II) from the synthetic HCl solution was investigated. Pd(II) was selectively extracted over Zn(II) from 9 M HCl solution by ALi-CY301(Nmethyl-N,N,N-trioctylammonium bis(2,4,4-trimethylpentyl) dithiophosphinic) and by ALi-I (N-methylN,N,N-trioctylammonium iodide) from weak HCl solution (pH 1). Since 9 M HCl was needed to completely dissolve Pd from the cemented Pd, ALi-CY301 was employed for the separation of Pd(II) and Zn(II) from the real HCl leaching solution of the cemented Pd. Two-stages counter-current extraction of the real HCl solution with ALi-CY301 resulted in selective extraction of Pd(II). Pd(II) was effectively stripped from the loaded ALi-CY301 by a mixture of HCl and NaClO. After oxidizing Pd(II) in the stripping solution to Pd(IV) by adding NaClO, Pd(IV) compound was synthesized by adding NH4Cl as a precipitant. By comparing leaching and extraction efficiency between hydrochloric and sulfuric acid solutions, a hydrometallurgical process consisted of HCl leaching, extraction with ALiCY301 and precipitation with NH4Cl was recommended for the recovery of pure (NH4)2PdCl6 from the cemented Pd.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 1; 88--100
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 54.

Tytuł:

Investigating the selectivity of calcium hypochlorite for flotation separation of chalcopyrite and pyrite pre-adsorbed collector

Autorzy:

Yang, Wenhui
Qiu, Xianhui
Yan, Huashan
Wu, Hao
Yang, Liu
Lai, Ruisen
Qiu, Tingsheng

Powiązania:

https://bibliotekanauki.pl/articles/2146919.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrite
chalcopyrite
calcium hypochlorite
flotation separation

Opis:

Bulk flotation is usually used in the flotation of Cu-Fe sulfide ore, and the subsequent concentrate is difficult to be separated because the minerals have adsorbed the collector. In this paper, flotation tests showed that calcium hypochlorite (Ca(ClO)2) had a stronger depression effect on pyrite pre-adsorbed sodium butyl xanthate (SBX), while having a negligible depressive effect on chalcopyrite. A copper concentrate with Cu grade of 33.32% and Cu recovery of 94.47% could be obtained from flotation tests of mixed minerals. The depression performance and mechanism of Ca(ClO)2 were studied by contact angle measurements, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses, the results suggested that Ca(ClO)2 can decomposes SBX on the pyrite surface and oxidizes the mineral surface to form hydrophilic substances, which enhances the hydrophilicity of the pyrite surface. In contrast, Ca(ClO)2 has little effect on chalcopyrite pre-adsorbed SBX, the possible depression model is discussed.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150703
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 55.

Tytuł:

Praca ojca za granicą a problem wychowania dziecka
Fathers Work Abroad and the Problem of Education of the Child

Autorzy:

Wojaczek, Krystian

Powiązania:

https://bibliotekanauki.pl/articles/475367.pdf

Data publikacji:

2011

Wydawca:

Uniwersytet Opolski. Redakcja Wydawnictw Wydziału Teologicznego

Tematy:

separation, education, father's authority, predominant feelings

Opis:

The separation of the father from his family, when he is working abroad, creates the abnormal emotional atmosphere in the educational environment of the child. Presence of the predominant emotion (hankering, loneliness and the lack of feeling of safety) disturbs the education of the child staying at home with his mother. Both parents should be present in the educational process of their child. The presence is broken even in the case of the oscillating presence home of the father, working abroad. Apart from the emotional environment, separation disturbs the cognitive aspect of the relation between the father and his child. There are disturbed the following: learning of the child’s needs, its emotional state and problems. Very important is father’s authority. Change of the traditional father’s role in the family makes him look for the new shape of the authority. He has to build his authority day by day, being near his children. The separation from the family, because of his work abroad disturbs this process.

Źródło:

Family Forum; 2011, 1; 133-153
2084-1698

Pojawia się w:

Family Forum

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 56.

Tytuł:

Extraction and separation of zinc, lead, silver, and bismuth from bismuth slag

Autorzy:

Xing, Peng
Ma, Baozhong
Wang, Chengyan
Chen, Yongqiang

Powiązania:

https://bibliotekanauki.pl/articles/109744.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

bismuth
zinc
lead
silver
extraction
separation

Opis:

The present paper deals with the extraction and separation of zinc, lead, silver, and bismuth from a refractory bismuth refining slag via a hydrometallurgical route. The process consists of a preliminary leaching of zinc with water, followed by the selective leaching of lead and silver with a calcium chloride solution, leading to the crystallization of lead chloride and the cementation of silver. The diagrams of the total concentrations of [Pb]/[Ag] versus [Cl-] and temperature in the Pb/Ag-Cl-H2O system were drawn, respectively, to determine the optimum concentration of leaching agent and leaching temperature. The potential-pH diagram of the Pb/Ag/Bi-H2O system indicates that the preferential leaching of lead and silver could be achieved. Finally, 98.8% of lead and 90.4% of silver were selectively removed by further leaching the water leaching residue with 400 g/dm3 of CaCl2 solution at pH 4.5 and 80 °C, while only 3.7% of bismuth was leached in this stage. Fifty-nine percent of lead in the leach liquor was separated out as PbCl2 by natural cooling. Ninety-five percent of silver in mother liquor was recovered by cementation with a lead sheet. The depleted CaCl2 solution can be sent to the leaching step again to close the loop.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 173-183
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 57.

Tytuł:

Effect of pulp temperature on separation of magnesite from dolomite in sodium oleate flotation system

Autorzy:

Yin, Wanzhong
Sun, Haoran
Tang, Yuan
Hong, Jongsu
Yang, Bin
Fu, Yafeng
Han, Huili

Powiązania:

https://bibliotekanauki.pl/articles/109912.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

magnesite
dolomite
temperature
adsorption
flotation separation

Opis:

The influence of pulp temperature on the floatability of magnesite and dolomite were studied by flotation test. Inductive Coupled Plasma Emission Spectrometer (ICP) was used to measure the dissolved metal ion content in the pulp by minerals in solution. X-ray photoelectron spectroscopy (XPS) was used to measure the presence and relative content of metal ions on mineral surfaces and the amount of sodium oleate adsorbed on mineral surfaces was measured by UV-Visible Spectrophotometer (UV-Vis). The results show that magnesite and dolomite have a great difference in flotation performance when the pulp temperature is 15 ℃ and the effective separation of magnesite from dolomite can be achieved. The main reason is that after the pulp is stirred at a pulp temperature of 15 ℃ and the pH of the pulp is adjusted with HCl and NaOH, the amount of metal ions remaining on the surface of the magnesite is much larger than that on the surface of the dolomite. Therefore, the active targets (metal ion) adsorbing oleate ions on the surface of the magnesite are more than that on the dolomite. When magnesite and dolomite coexist, oleic acid ion mainly acts on the surface of magnesite at the optimum temperature, which makes magnesite float up and the separation of magnesite from dolomite could be achieved.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 4; 1049-1058
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 58.

Tytuł:

Flotation separation of chalcopyrite from talc using carboxymethyl chitosan as depressant

Autorzy:

Qian, G.
Bo, F.
Danping, Z.
Jujie, G.

Powiązania:

https://bibliotekanauki.pl/articles/110249.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

talc
chalcopyrite
flotation
separation
carboxymethyl chitosan

Opis:

Flotation separation of chalcopyrite from talc using carboxymethyl chitosan as a depressant was studied. Flotation tests indicated that carboxymethyl chitosan had a selective depression effect on talc and the use of carboxymethyl chitosan as the depressant could achieve flotation separation of chalcopyrite from talc at pH 7. Adsorption studies showed that carboxymethyl chitosan only adsorbed on the surface of talc. This was the reason why carboxymethyl chitosan had high depression selectivity for talc. The zeta potential measurements and XPS analysis indicated that carboxymethyl chitosan adsorbed on the talc surface mainly through physical interaction and hydrophobic interaction may be the main driving force.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1255-1263
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 59.

Tytuł:

Behavior and mechanism of collophane and dolomite separation using alkyl hydroxamic acid as a flotation collector

Autorzy:

Yu, J.
Ge, Y.
Hou, J.

Powiązania:

https://bibliotekanauki.pl/articles/110455.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

hydroxamic acid
collophane
dolomite
separation mechanism

Opis:

Flotation response of collophane and dolomite using alkyl hydroxamic acid (AH) (chelating collector) was investigated in the paper. The experiments were performed using pure and artificially mixed minerals as well as a real phosphate ore. Their separation mechanisms were studied by means of zeta potential measurements, infrared analysis, adsorption measurements, thermodynamics, and quantum chemical calculations. The results indicated that AH exhibited an excellent performance in the flotation separation of collophane from dolomite in neutral medium. The P2O5 grade of the concentrate increased from 19.84% to 30.51% without any other reagents when the pH value was about 7. The zeta potential and adsorption studies showed that the adsorption of AH at the cellophane/aqueous interface was greater than that at dolomite surface, which was the essential reason that separation of collophane from dolomite. The results of Fourier Transform Infrared (FTIR) spectrum and thermodynamics calculation indicated that the adsorption of AH at collophane was attributed to the chemical bonding. Moreover, AH molecule formed O-O five-membered ring with calcium ion on the collophane surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 155-169
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 60.

Tytuł:

Membrane separation of carbon dioxide in the integrated gasification combined cycle systems

Autorzy:

Kotowicz, J.
Skorek-Osikowska, A.
Janusz-Szymańska, K.

Powiązania:

https://bibliotekanauki.pl/articles/240308.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

IGCC
separacja membranowa
CCS
membrane separation

Opis:

Integrated gasification combined cycle systems (IGCC) are becoming more popular because of the characteristics, by which they are characterized, including low pollutants emissions, relatively high efficiency of electricity production and the ability to integrate the installation of carbon capture and storage (CCS). Currently, the most frequently used CO2 capture technology in IGCC systems is based on the absorption process. This method causes a significant increase of the internal load and decreases the efficiency of the entire system. It is therefore necessary to look for new methods of carbon dioxide capture. The authors of the present paper propose the use of membrane separation. The paper reviews available membranes for use in IGCC systems, indicates, inter alia, possible places of their implementation in the system and the required operation parameters. Attention is drawn to the most important parameters of membranes (among other selectivity and permeability) influencing the cost and performance of the whole installation. Numerical model of a membrane was used, among others, to analyze the influence of the basic parameters of the selected membranes on the purity and recovery ratio of the obtained permeate, as well as to determine the energetic cost of the use of membranes for the CO2 separation in IGCC systems. The calculations were made within the environment of the commercial package Aspen Plus. For the calculations both, membranes selective for carbon dioxide and membranes selective for hydrogen were used. Properly selected pressure before and after membrane module allowed for minimization of energy input on CCS installation assuring high purity and recovery ratio of separated gas.

Źródło:

Archives of Thermodynamics; 2010, 31, 3; 145-164
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 61.

Tytuł:

Flotation separation of rutile from almandine using octadecyl amine polyoxyethylene ether as collector

Autorzy:

Li, Hongqiang
Zheng, Huifang
Chen, Qian
Kasomo, Richard M.
Leng, Jiahao
Weng, Xiaoqing
Song, Shaoxian
Xiao, Linbo
Tian, Chengtao

Powiązania:

https://bibliotekanauki.pl/articles/1449410.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

rutile
almandine
flotation separation
adsorption mechanism

Opis:

In this study, the flotation separation of rutile from almandine using cationic surfactant Octadecyl amine polyoxyethylene ether (AC1815) as a new collector was investigated. The adsorption mechanism of AC1815 on rutile was illustrated through zeta potential measurement, infrared spectrum and XPS analyses. The flotation experiments demonstrated that AC1815 exhibited an excellent collecting ability and selectivity for rutile. The results of zeta potential measurements and XPS analysis indicated that more AC1815 was adsorbed on rutile surface instead of almandine. The adsorption mechanism of AC1815on rutile was mainly attributed to the electrostatic interaction between the positively charged molecules of AC1815 and the negatively charged rutile surface, and the hydrogen bonding between the protonated $≡NH^+$, $≡N$ group of AC1815 and $Ti-OH$ on rutile surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 4; 653-664
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 62.

Tytuł:

Kinetic modelling and optimization of flotation process of electrum

Autorzy:

Aydın, Ş. Beste
Gül, Alim

Powiązania:

https://bibliotekanauki.pl/articles/2146860.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

electrum
flotation
separation efficiency
kinetic models

Opis:

The investigation of flotation as an alternative method to cyanide leaching of gold ores is significant in terms of economic and environmental aspects. In this study, a gold ore sample containing 4.79 ppm Au and 7.72 ppm Ag was used. Gold and silver were observed to be present as liberated electrum or associated with or within quartz, galena, and sphalerite. Initially, five-stage rougher flotation tests were conducted, and then three-stage scavenger circuits and four-stage cleaning flotation circuits were performed in order to obtain high-content gold concentrate and decrease losses of Au and Ag in tailings. As a result of tests, the flotation concentrate assayed as 437 ppm Au and 511 ppm Ag was obtained with recoveries of 76.3% and 58.5%, respectively. This study reveals that the concentrates ready for direct smelting without any additional process can be obtained with flotation. In order to determine kinetic characteristic of electrum in the sample, the tests were conducted using firstorder model, first-order model with rectangular distribution of rate constants, second-order model and second-order model with rectangular distribution of rate constant. The second-order model was considered as most reasonable for fitting the recoveries of gold as a function of flotation time during the flotation process.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 6; 80--94
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 63.

Tytuł:

Study on flotation behavior and mechanism of separating chalcopyrite and Molybdenite with ethyl mercaptoglycolate as inhibitor

Autorzy:

Yang, Xiao-Feng
Xu-Zhao
Liu, Yao-Yao

Powiązania:

https://bibliotekanauki.pl/articles/24085868.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ethyl thioglycolate
chalcopyrite
molybdenite
inhibitor
separation

Opis:

The effect of ethyl thioglycolate organic small molecule inhibitors on chalcopyrite molybdenite flotation behaviour is investigated via single mineral micro-flotation tests, zeta potential tests, and X-ray photoelectron spectroscopy (XPS) analysis. Results of the flotation test indicate that ethyl thioglycolate organic small-molecule inhibitors can effectively separate Cu and Mo and selectively inhibit chalcopyrite under weak alkaline conditions. Infrared spectroscopy and XPS analysis show that hydrophilic functional groups C=O and -COOH in the ethyl thioglycolate organic small molecules can chemically adsorb onto the chalcopyrite surface. Moreover, ethyl thioglycolate has no obvious effect on zeta potential of molybdenite. Therefore, ethyl thioglycolate can effectively separate chalcopyrite and molybdenite.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162824
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 64.

Tytuł:

Ocena dokładności rozdziału drobnych (< 2 mm) ziaren miałów węglowych w procesie odsiarczania w separatorach zwojowych
Evaluation of the sharpness of fine coal particles (< 2 mm) separation during desulphurization process performed in spiral separators

Autorzy:

Nowak, A.
Surowiak, A.

Powiązania:

https://bibliotekanauki.pl/articles/349946.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

krzywe rozdziału
ostrość rozdziału
separatory zwojowe
miały węglowe
separation curves
separation sharpness
spiral separators
fine coals

Opis:

W artykule przedstawiono rezultaty przemysłowych badań procesu odsiarczania drobnych (< 2 mm) klas ziarnowych miałów węglowych. Celem badań była ocena ostrości rozdziału najdrobniejszych ziaren miału w separatorach zwojowych. Realizując założony cel, w dwóch zakładach wzbogacania miałów węgli energetycznych pobrano reprezentatywne próbki nadawy i produktów rozdziału w separatorach. Wykonano analizy granulometryczne i densymetryczne próbek oraz analizy chemiczne poszczególnych klasofrakcji. Z aproksymowanych rozkładem Weibulla krzywych rozdziału wyznaczono wskaźniki dokładności rozdziału. Na tej podstawie wyciągnięto wnioski odnośnie prawidłowości doboru parametrów pracy separatorów i układu technologicznego.
The paper presents the industrial results of the fine coal particle fractions (< 2 mm) desulphurization process investigation. The purpose of the research was to evaluate the sharpness of the finest coal particles separation in spiral separators. Performing this task, the representative samples of the feed and separation products were collected in two energetic fine coal beneficiation plants. The granulometric and densimetric analyzes of the samples, as well the chemical analyzes of individual class-fractions were performed. Then, the separation sharpness factors were calculated on the basis of the separation curves approximated by Weibull distribution function. This was the basis for making conclusions concerning the adequacy of selecting separators working and technological system parameters.

Źródło:

Górnictwo i Geoinżynieria; 2009, 33, 4; 245-257
1732-6702

Pojawia się w:

Górnictwo i Geoinżynieria

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 65.

Tytuł:

Wpływ parametrów procesowych na przebieg separacji pianowej białek mlecznych
Influence of process parameters on the course of milk protein foam separation

Autorzy:

Kawalec-Pietrenko, B.
Hołowacz, I.
Kucharska, K.
Zander, L.

Powiązania:

https://bibliotekanauki.pl/articles/2071243.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

białka mleczne
separacja pianowa
stała szybkości separacji pianowej
milk protein
foam separation
foam separation rate constant

Opis:

Badano przebieg separacji pianowej białek mlecznych we współprądowej kolumnie barbotażowej. Wyznaczono stałe szybkości flotacji. Ze wzrostem prędkości przepływu powietrza zaobserwowano korzystny dla procesu wzrost stałych szybkości procesu. Stała szybkości flotacji osiąga wartość maksymalną dla pil odpowiadającego naturalnemu pH roztworów białek mlecznych. Szybkość flotacji spada wyraźnie, jeśli stężenie białka przewyższy 40 g-m3.
A course of foam separation of milk proteins was studied in a cocurrent bubble column. Flotation rate constant values were determined. An increase of flotation rate constant was observed with the increase of air flow rate. A value of flotation rate constant reached its maximum for the natural pH value of milk proteins solutions. The rate of foam separation diminished distinctly if the initial milk protein concentration is higher than 40 g-m3.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 3; 45-46
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 66.

Tytuł:

Microfluidic design for continuous separation of blood particles and plasma using dielectrophoretic force principle

Autorzy:

Pakhira, Writtick
Kumar, Rajagopal
Panwala, Fenil Chetankuma
Ibrahimi, Khalid Mohd

Powiązania:

https://bibliotekanauki.pl/articles/38702917.pdf

Data publikacji:

2023

Wydawca:

Instytut Podstawowych Problemów Techniki PAN

Tematy:

blood cell separation
dielectrophoresis
microfluidic device
plasma separation
separacja komórek krwi
dielektroforeza
urządzenie mikroprzepływowe
separacja plazmy

Opis:

Nowadays, various microfluidic platforms are developed with a focus on point-of-care diagnostics in the biomedical field. Segregation of blood cells and plasma remains an essential part of medical diagnosis in which isolation of platelets (PLTs), red blood cells (RBCs), and white blood cells (WBCs) is a requirement for analysis of diseases associated with thrombocytopenia, anemia, and leukopenia. However, a separated plasma contains proteins, nucleic acids, and viruses, for which a microfluidic device is introduced for continuous separation of PLTs, RBCs, and WBCs with a diameter range of 1.8–2 m, 5–6 m, and 9.4–14 m, respectively, and plasma using the negative dielectrophoresis (DEP) force principle. In this study, design of the device is explored utilizing COMSOL Multiphysics 5.4 tool. This design consists of triangular micro-tip electrodes at the top, which are effective in generating a nonuniform electrical field with a significantly small AC voltage. Furthermore, the blood cells are subjected to the negative DEP force resulting in deflection toward their respective outlets, due to which blood cell separation purity and efficiency from the sample, i.e., of PLTs, RBCs, and WBCs, improve and are obtained at a blood sample flow velocity of 700 m/s and buffer solution flow velocity of 1200 m/s with 12 Vpp electrode voltage, after experimenting and testing at multiple flow velocities. Additionally, a curved microchannel is introduced, producing better plasma flow velocity than a flat microchannel at the side outlets (top and bottom). The cell-free diluted plasma is collected at side outlets (top and bottom) with high purity and improved separation efficiency.

Źródło:

Computer Assisted Methods in Engineering and Science; 2023, 30, 3; 323-345
2299-3649

Pojawia się w:

Computer Assisted Methods in Engineering and Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 67.

Tytuł:

Membranowe oczyszczanie biogazu pochodzenia rolniczego
Upgrading agricultural biogas by membrane separation process

Autorzy:

Polak, A.
Chmielewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/2070995.pdf

Data publikacji:

2010

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

oczyszczanie biogazu
membrana poliimidowa
separacja membranowa
biogazownia rolnicza
biogas separation
polyimide membrane
membrane separation
biogas plant

Opis:

Fermentacja metanowa jest nie tylko skuteczną metodą zagospodarowania odpadów, ale stanowi również cenne źródło energii, wziąwszy pod uwagę wartość opałową powstającego podczas niej biogazu. Membranowe oczyszczenie biogazu powoduje znaczne wzbogacenie w metan, powiększając tym samym możliwości zastosowania biogazu w energetyce. Przy zastosowaniu poliimidowych membran i modułów hollow-fiber uzyskano produkt o stężeniu metanu przekraczającym 80% obj., co umożliwia zastosowanie biogazu w CHP.
The methane fermentation process has long been used as a method of organic matter utilization and biogas production. In this work a polyimide membrane was used with success to enhance the methane content in biogas from the Polish agricultural plant. At 68% CH4 in feed gas, 82% methane content was achieved. Biogas with methane content over 70% is very promising as an alternative energy source and it can be the feed in a cogeneration generator.

Źródło:

Inżynieria i Aparatura Chemiczna; 2010, 2; 101-102
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 68.

Tytuł:

Magnetic separation of lunar regolith as its beneficiation for construction effort on the Moon

Autorzy:

Kobaka, Janusz
Katzer, Jacek
Seweryn, Karol

Powiązania:

https://bibliotekanauki.pl/articles/27314466.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Centrum Badań Kosmicznych PAN

Tematy:

regolith
beneficiation
magnetic separation
building material
Moon

Opis:

A concept of magnetic separation of regolith for production of lunar aggregate is presented in the paper. Future construction effort on the Moon will require significant amounts of concrete-like composites. The authors formulate a hypothesis that magnetic separation of regolith would be a very efficient beneficiation procedure solving multiple civil engineering problems associated with properties of raw lunar soil. For the research program, 10 lunar soil simulants were used. The magnetic separation was feasible in majority of cases. Acquired lunar aggregate would be useful for both concrete-like composite production and covering the surface of a habitat. The aims of future research are pointed out in the paper.

Źródło:

Artificial Satellites. Journal of Planetary Geodesy; 2023, 58, Special Issue 1; 203--213
2083-6104

Pojawia się w:

Artificial Satellites. Journal of Planetary Geodesy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 69.

Tytuł:

K primeneniju metod mekhaniki splosnykh sred dlja opisanija dvizhenija zernovykh smesejj na vibroreshetakh
To the application methods of continuum mechanics to describe the motion of grain mixes on vibrating sieves

Autorzy:

Tishhenko, L.
Kharchenko, S.

Powiązania:

https://bibliotekanauki.pl/articles/78243.pdf

Data publikacji:

2013

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

grain mixture
sieve
vibration
separation
dynamics model

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 7
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 70.

Tytuł:

The Abstraction Principle and the Separation Principle in German Law

Autorzy:

Sadowski, Kornel

Powiązania:

https://bibliotekanauki.pl/articles/684917.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

abstraction principle
separation principle
German law system

Opis:

The aim of the study is to evaluate the selected principles applied in German law system – the abstraction principle and the separation principle. Presenting the proposed subject the author focus on the obligatory and dispositive legal acts and practical dimensions of the functioning of the selected principles.

Źródło:

Adam Mickiewicz University Law Review; 2014, 4; 237-243
2450-0976

Pojawia się w:

Adam Mickiewicz University Law Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 71.

Tytuł:

Influence of membrane amplitude and forcing frequency on synthetic jet velocity

Autorzy:

Kurowski, M.
Doerffer, P.

Powiązania:

https://bibliotekanauki.pl/articles/1938641.pdf

Data publikacji:

2015

Wydawca:

Politechnika Gdańska

Tematy:

synthetic jet
active flow control
flow separation

Opis:

This paper presents the results of numerical investigations of a synthetic jet actuator for an active flow control system. The Moving-Deforming-Mesh method as a boundary condition is used to capture the real physical phenomenon. This approach allows precise investigation of the influence of the membrane amplitude, the forcing frequency and cavity effect on the jet velocity. A synthetic jet actuator is simulated using a membrane perpendicular to the surface arrangement. Two cases are investigated to maximize the jet velocity – an actuator with one and two membranes in a cavity. Two main forcing frequencies can be specified in the synthetic jet actuator application. One corresponds to the diaphragm natural frequency and the other corresponds to the cavity resonant frequency (the Helmholtz frequency). This study presents the results of actuators operating at the two abovementioned forcing frequencies. The simulation results show an increase in the jet velocity as a result of an increase in the membrane peak-topeak displacement. This study was a preliminary study of the synthetic jet actuator for single and double membrane systems. The optimization process of the synthetic jet actuator geometry and parameters is ongoing. Numerical results obtained in these investigations are to be validated in the experimental campaign.

Źródło:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2015, 19, 2; 111-120
1428-6394

Pojawia się w:

TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 72.

Tytuł:

Recovery of metals from printed circuit boards by means of electrostatic separation

Autorzy:

Franke, Dawid
Suponik, Tomasz
Nuckowski, Paweł M.
Gołombek, Klaudiusz
Hyra, Kamila

Powiązania:

https://bibliotekanauki.pl/articles/409724.pdf

Data publikacji:

2020

Wydawca:

STE GROUP

Tematy:

electrostatic separation
metals recovery
PCB
SEM
XRD

Opis:

Without the use of appropriate recycling technologies, the growing amount of electronic waste in the world can be a threat to the development of new technologies, and in the case of improper waste management, may have a negative impact on the environment. This is due to the fact that this waste contains large amounts of valuable metals and toxic polymers. Therefore, it should be recycled in accordance with the assumptions of the circular economy. The methods of mechanical recovery of metals from electronic waste, including printed circuits, may be widely used in the future by waste management companies as well as metal production and processing companies. That is why, a well-known and easily applicable electrostatic separation (ES) method was used to recover metals from printed circuit boards. The grain class of 0.32 - 0.10 mm, obtained after grinding the boards, was fed to a separator. Feed and separation products were analyzed by means of ICP-AES, SEM/EDS and XRD. The concentrate yield obtained after electrostatic separation amounted to 32.3% of the feed. Its density was 11.1 g/cc. Out of the 91.44% elements identified in the concentrate, over 90% were metals. XRD, SEM observations and EDS analysis confirmed the presence of non-metallic materials in the concentrate. This relatively high content of impurities indicates the need to grind printed circuit board into grain classes smaller than 0.32-0.10 mm.

Źródło:

Management Systems in Production Engineering; 2020, 4 (28); 213-219
2299-0461

Pojawia się w:

Management Systems in Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 73.

Tytuł:

Opracowanie nowej immobilizowanej membrany ciekłej do rozdziału składników gazowych
Development of a new immobilized liquid membrane for separation of gaseous components

Autorzy:

Szwast, M.

Powiązania:

https://bibliotekanauki.pl/articles/2072179.pdf

Data publikacji:

2013

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

membrany
SLM
separacja gazów
membranes
gas separation

Opis:

W pracy wykonano i przebadano własną membranę immobilizowaną(SLM) zbudowaną z mikroporowatej membrany polipropylenowej i oleju silikonowego. W tym celu opracowano metodę uzyskiwania modułów membranowych zawierających membrany SLM. Przeprowadzono badania z użyciem gazów 02, N2 i C02. Uzyskane wyniki wskazują, że tego typu membrana charakteryzuje się dużymi przepuszczalnościami, ale jednocześnie dość niskimi współczynnikami separacji.
In this paper the authors' own SLM membrane is presented. For the purpose of this work a new immobilized membrane was prepared using a micropo- rous polypropylene membrane and silicone oil. A new method for obtaining such membrane modules was developed. Tests were conducted using such gases as 02, N2 and C02. The obtained results indicate that this type of mem-brane is characterized by large permeability factors but also by quite small separation factors.

Źródło:

Inżynieria i Aparatura Chemiczna; 2013, 5; 485--486
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 74.

Tytuł:

Selective chromium III/VI separation in polymer inclusion membrane system

Autorzy:

Rajewski, J.
Religa, P.
Wojasiński, M.
Gierycz, P.

Powiązania:

https://bibliotekanauki.pl/articles/115544.pdf

Data publikacji:

2014

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

chromium separation
selectivity
D2EHPA
PIM

Opis:

Analyze of chromium(III) transport process from mixtures of Cr(III)/Cr(VI) ions with polymer inclusion membrane (PIM) system have been done. Di(2-ethylhexyl) phosphoric acid (D2EHPA) have been used as a carrier. It was found that the transport efficiency in PIM is dependent on the carrier concentration in the membrane. It was found that there is an optimal range of carrier concentration in the membrane, which ensures rapid and efficient transport. In studied system optimal D2EHPA concentration was in range between 0,9- 1,5 mol/dm3. Membrane worked as selective barrier for Cr(VI) ions. However increase of Cr(VI) concentration above 0,0005 mol/dm3 negatively influenced Cr(III) transport. It was caused by degradation of the polymer inclusion membrane made of cellulose triacetate (CTA) . Strongly oxidizing Cr(VI) ions can damage polymer inclusion membrane with CTA matrix. The chemical attack of strongly oxidant Cr(VI) ions could lead either to hydrolysis of the pendant acetyl group or to oxidation of polymer backbone leading to chain scission. Moreover, oxidation is accelerated at high concentration of Cr(VI) ions. The membrane containing D2EHPA as a carrier can be recommended for selective separation of Cr(III) ions only from diluted Cr(VI)/Cr(III) mixtures. However the polymer inclusion membrane need a change the polymer matrix.

Źródło:

Challenges of Modern Technology; 2014, 5, 1; 15-19
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 75.

Tytuł:

On the value function for multi-isotope mixtures separation

Autorzy:

Palkin, V. A.

Powiązania:

https://bibliotekanauki.pl/articles/347060.pdf

Data publikacji:

2004

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

isotope separation
value function
multi-isotope mixtures

Opis:

One of the possible approaches to the introduction of the value function in the case of multi-isotope mixtures is presented. It is based on a simplified model of separation processes in cascades and elements with multiplication of elementary effects of separation. A differential equation, being a necessary condition of the determination of the value function, is derived from the analysis of this model. Its general solution contains arbitrary constants which should be obtained considering boundary conditions and specific features of the separation process. Additional conditions concerning use of the found solutions in cascade criteria of an estimation of separation efficiency are stipulated. The applicability of various kinds of the value function forming at different conditions is analyzed. The forms of the value function which reflect best the optimal cascade with assigned external concentrations of the desired isotope and the matched abundance ratio cascade (MARC) are established.

Źródło:

Ars Separatoria Acta; 2004, 3; 51-61
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 76.

Tytuł:

Religijność instytucjonalna jako czynnik adaptacji polskich imigrantów w Irlandii
Institutional Religiosity as a Factor in the Adaptation of Polish Immigrants in Ireland

Autorzy:

Lisak, Marcin

Powiązania:

https://bibliotekanauki.pl/articles/579697.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

POLISH MIGRANTS
IRELAND
RELIGION
CATHOLICISM
INTEGRATION
SEPARATION

Opis:

A high level of adherence with Catholicism is one of the cultural similarities between the cohort of Polish immigrants living in Ireland and the rest of the Republic of Ireland’s population. Sharing the same religious beliefs seems to be a social bridge that accelerates mutual acceptance and adjustment at the time of massive migration. Therefore, the article aims to evaluate the integrative function of institutional religiousness. The fi ndings show that both the Polish immigrants and the natives tend to separate from one another instead of integrating, though. With regard to the bonding function of institutional religiousness, a high level of intercultural competence among religious leaders is required. It is evident, however, that neither the Irish Catholic church nor the chaplaincy for Polish immigrants have such skilful and integrative leaders.

Źródło:

Studia Migracyjne - Przegląd Polonijny; 2015, 41, 2 (156); 97-121
2081-4488
2544-4972

Pojawia się w:

Studia Migracyjne - Przegląd Polonijny

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 77.

Tytuł:

Beneficiation and concentration of feldspar from syenite ore in Medina, Saudi Arabia for industrial utilization

Autorzy:

Gougazeh, Mousa

Powiązania:

https://bibliotekanauki.pl/articles/2175450.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

syenite
dry magnetic separation
floatation
grade
recovery

Opis:

The objective of this study was to reduce the contents of iron and titanium heavy minerals of feldspar from Medina syenite ore by a combination of magnetic separation and flotation to obtain the commercial scale of feldspar concentrate for glass and ceramics industries. For the first time, a process flowchart was provided in the light of this study to produce a high-quality K-feldspar product from syenite ore, which meets the requirements of feldspar for glass and ceramics productions. The results reflect that the best performance separation of iron and titanium contents was produced by a dry magnetic separator at 16.000 gauss. The produced feldspar concentrate by magnetic separation yielding 0.54% Fe2O3 with 87% Fe2O3 recovery and 0.57% TiO2 with 16% recovery. The flotation tests were performed on the non-magnetic fraction of the syenite ore. In this stage, the most effective for removal of Fe2O3 and TiO2 from syenite ore was obtained at a 300 g/ton dosage of a mixture of Aeromine 3030C and Aeromine 801 + Aeromine 825 as a collector in an acidic medium (pH 3). The final feldspar concentrate with 0.07% Fe2O3 and 0.06%TiO2 grades was obtained with 89% Fe2O3 recovery and 86% TiO2 recovery. The commercial scale of feldspar concentrate from syenite ore can meet the desired specification of grades 1 and 2 for glass, porcelain, and ceramics industries.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 155056
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 78.

Tytuł:

Olympiodorus and Damascius on the Philosopher’s Practice of Dying in Plato’s Phaedo

Autorzy:

Mouzala, Melina G.

Powiązania:

https://bibliotekanauki.pl/articles/633492.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet im. Adama Mickiewicza w Poznaniu

Tematy:

Plato
Phaedo
Neoplatonism
death
soul
purification
separation

Opis:

This paper presents Olympiodorus’ and Damascius’ explanations of the philosopher’s practice of dying in Plato’s Phaedo. It also includes a presentation of Ammonius’ exegesis of the practice of death (meletē thanatou). The Neoplatonic commentators discern two kinds of death, the bodily or physical death and the voluntary death. Olympiodorus suggests that bodily death is only an image of voluntary death and cannot be recognized as an original death, because original death presupposes the preparation for death and the constant effort for the purification of the soul during the philosopher’s life-time. Only preparation for death and purification can ensure the complete separation of the soul from the body. Relative to this distinction is that between apothnēskein and tethnanai; these infinitives denote the dual meaning of death: death as an event or a process and death as a state. Our study examines thoroughly the subtle distinctions made by Olympiodorus and Damascius and offers a comparative analysis of the two definitions of death as well as that of purification. It reaches the conclusion that apothnēskein is a necessary condition of tethnanai, i.e. of a definitive release and parting of the soul from the body. On the other hand, the process of eventual purification, a notion which betrays the religious character of purification, can be identified with apothnēskein, which is the practice of dying by the true philosopher. Finally, our study also emphasizes and explains the difference between the voluntary philosophical death and the voluntary unphilosophical suicide; the latter guaranteeing only bodily or physical death.

Źródło:

Peitho. Examina Antiqua; 2014, 5, 1; 177-198
2082-7539

Pojawia się w:

Peitho. Examina Antiqua

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 79.

Tytuł:

Production and quality control of 66Ga radionuclide

Autorzy:

Sabet, M.
Rowshanfarzad, P.
Jalilian, A.
Ensaf, M.
Rajamand, A.

Powiązania:

https://bibliotekanauki.pl/articles/146278.pdf

Data publikacji:

2006

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

gallium-66
cyclotron
radiochemical separation
target recovery

Opis:

The purpose of this study was to develop the required targetry and radiochemical methods for production of 66Ga, according to its increasing applications in various fields of science. The 66Zn(p,n)66Ga reaction was selected as the best choice for the production of 66Ga. The targets were bombarded with 15 MeV protons from cyclotron (IBA-Cyclone 30) at the Nuclear Research Center for Agriculture and Medicine (NRCAM) with a current of 180 mA for 67 min. ALICE and SRIM (Stopping and Range of Ions in Matter) nuclear codes were used to predict the optimum energy and target thickness. Targets were prepared by electroplating 95.73% enriched 66Zn on a copper backing. Chemical processing was performed by a no-carrier-added method consisting of ion exchange chromatography and liquid-liquid extraction. Anion exchange chromatography was also used for the recovery of target material. Quality control of the product was carried out in two steps of chemical and radionuclide purity control. The activity of 66Ga was 82.12 GBq at EOB and the production yield was 410.6 MBq/mAh. The radiochemical separation yield was 93% and the yield of chemical recovery of the target material was 97%. Quality control tests showed a radionuclide purity higher than 97% and the amounts of chemical impurities were in accordance with the United States Pharmacopoeiae levels.

Źródło:

Nukleonika; 2006, 51, 3; 147-154
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 80.

Tytuł:

Numerical investigation of particle separation in a centrifugal air separator

Autorzy:

Kaczyński, J.
Kraft, M.

Powiązania:

https://bibliotekanauki.pl/articles/175534.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

CFD simulation
discrete particle model
particle separation

Opis:

This paper presents the modeling approaches and results of numerical investigations into particle separation in a production-scale industrial centrifugal air separator. The gaseous phase was modeled using an Eulerian formulation, while the particle phase was modeled using a Lagrangian particle tracking approach. Two-way coupling between continuous and disperse phase was included and turbulence modeled using the realizable k-ε model. The resulting comprehensive system model provides correct predictions of the power consumption and of pressure losses in the device over the full operation range, and proved ability of accurately predicting the size-dependent particle separation efficiencies down to nominal particle sizes of 2 µm.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 57-71
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 81.

Tytuł:

Simultaneous Analysis of Vibrations and Noise in the Task of Minimizing Vibroacoustic Activity of Machines

Autorzy:

Dąbrowski, Z.
Dziurdź, J.

Powiązania:

https://bibliotekanauki.pl/articles/177692.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

signal separation
noise minimizing
frequency response function

Opis:

Simultaneous propagation of vibrations and noise has an important role in the task of minimizing vibroacoustic hazards on the station of operator of the construction machinery. In many cases vibrations transferred by the construction are processed to noise in different points of the machine. As a result, they may increase the level of noise at the workplace. The paper presents the proposition of a simple estimation of noise and vibration propagation paths of the machine. On the basis of the analysis of hydraulic excavator an effectiveness of a proposed procedure was shown. This procedure helps to minimize the transfer of vibrations of power unit in selected frequency ranges which led to the change of overall noise level in operator’s cab about 5 dB.

Źródło:

Archives of Acoustics; 2016, 41, 2; 303-308
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 82.

Tytuł:

The theory of isotope separation in cascades: problems and solutions

Autorzy:

Borisevich, V. D.
Sulaberidze, G. A.
Wood, H.

Powiązania:

https://bibliotekanauki.pl/articles/347051.pdf

Data publikacji:

2003

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

isotope separation
cascade
binary and multicomponent mixtures

Opis:

The status of the theory of isotope mixture separation in cascades is presented. The problems that limit the concept of an ideal cascade in the case of separation of binary mixtures and arbitrary separation factors at cascade stages are discussed. A new type of separating cascades which have a total flow less than the flow of the corresponding ideal cascade is presented. Furthermore, these “optimum” cascades may permit mixing concentrations and still produce higher cascade separative work. In the paper, a criterion to define efficiency for the separation of multi-isotope mixtures is analyzed. The analysis is based on the concept of the match-abundance ratio cascade (MARC). The approach has demonstrated that in order to obtain the optimum parameters of a single stage in a cascade it is necessary to minimize the linear combination of the inverse values of “partial separative powers” for all mixture components.

Źródło:

Ars Separatoria Acta; 2003, 2; 107-124
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 83.

Tytuł:

Cryoadsorption as universal route to dihydrogens of high and ultrahigh individual purity

Autorzy:

Parbuzin, V. S.
Yakovlev, V. A.
Lukyanov, A. A.
Leshchev, Y. A.

Powiązania:

https://bibliotekanauki.pl/articles/347055.pdf

Data publikacji:

2003

Wydawca:

Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej

Tematy:

dihydrogens
ultrahigh individual purity
cryoadsorptive separation cascade

Opis:

The paper describes a new efficient cryoadsorptive method of dihydrogens p-H2, o-H2, HD, o-D2, p-D2, HT, DT, T2 separation with moving temperature gradient on the adsorbent fixed bed. The method was developed at the Department of Chemistry, Moscow State University, as a result of many years’ experimental and theoretical investigations. The separation method, and corresponding periodical action apparatus named MTGA (Moving Temperature Gradient Adsorption), and MGU DETRA (Multispecious Gas Separator-Upgrader: DEuterium, TRitium, Adsorption), respectively, are applied to prepare individual dihydrogens in very pure isotopic or nuclear-spin forms. In this paper, the basic design and possibilities of a typical three – stage laboratory adsorption separative cascade are given. The cascade was used to prepare two gases of ultrahigh isotopic purity (99.9998 mol.% deuterium and 99.98 mol.% deuterium hydride HD) for the first time. Moreover, the paper presents the results of successful studies on enriching microquantities of tritium-containing molecules HT, DT, T2 from macrocomponents H2 and D2.

Źródło:

Ars Separatoria Acta; 2003, 2; 84-96
1731-6340

Pojawia się w:

Ars Separatoria Acta

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 84.

Tytuł:

Proper intersection multiplicity and regular separation of analytic sets

Autorzy:

Cygan, Ewa
Tworzewski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/1311692.pdf

Data publikacji:

1994

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

proper intersection
multiplicity
exponent of regular separation

Opis:

We consider complex analytic sets with proper intersection. We find their regular separation exponent using basic notions of intersection multiplicity theory.

Źródło:

Annales Polonici Mathematici; 1994, 59, 3; 293-298
0066-2216

Pojawia się w:

Annales Polonici Mathematici

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 85.

Tytuł:

Design concept and parameters of a conical bar separator

Autorzy:

Jadwisieńczak, B.
Kaliniewicz, Z.

Powiązania:

https://bibliotekanauki.pl/articles/298140.pdf

Data publikacji:

2017

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

seeds
cleaning and separation
separator
geometrical relationships

Opis:

The process of adapting a screen separator to seeds of a given species and variety requires a corresponding set of replaceable screens. Screen replacement is a time-consuming process. Screens are often selected from the available size range, therefore, cleaning and separation processes are not always optimized. This study proposes a design concept of a new device for cleaning and separating seeds, which features a conical bar screen that rotates around its own axis. The screen has grooves whose width is smallest at the beginning of the screen and increases along the screen surface. Seeds can be sorted into various size fractions by changing the position of collecting buckets under the screen. The functional parameters of the separating device were designed based on a review of publications describing the size of the most popular agricultural seeds. The basic geometrical relationships in the proposed conical bar screen were described. The geometrical parameters of the screen were selected on the assumption that the radius at which bars are fixed to the screen can range from 200 mm to 400 mm and that bar diameter can range from 5 mm to 10 mm. Two variants of the device were proposed as a replacement for one universal separating screen. The first variant will be used to sort small seeds, including seeds of small-seeded legumes, seeds of major cereal species and medium-sized seeds with dimensions similar to cereal seeds, whereas the second variant will be applied to separate large seeds, including seeds of large-seeded legumes and plumper seeds from the medium-size fraction. The width of grooves at the beginning and end of the screen should equal 1 mm and 5 mm in the first variant and 2.5 mm and 13 mm in the second variant, respectively.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(3); 275-288
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 86.

Tytuł:

Utilization of N-carboxymethyl chitosan as a selective depressant for talc in flotation of chalcopyrite

Autorzy:

Liu, Cheng
Feng, Qiming
Shi, Qing
Zhang, Wencai
Song, Shaoxian

Powiązania:

https://bibliotekanauki.pl/articles/110512.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

chalcopyrite
talc
flotation separation
N-carboxymethyl chitosan

Opis:

Flotation separation of chalcopyrite from talc is difficult because of the natural hydrophobicity of two minerals. In this work, the flotation separation of chalcopyrite from talc using N-carboxymethyl chitosan as a depressant for talc was studied. The micro-flotation results indicated that the flotation separation of chalcopyrite from talc cannot be realized effectively at pH 9 with low concentration of N-carboxymethyl chitosan, in the presence of calcium ions, talc was more efficiently depressed by N-carboxymethyl chitosan, while the chalcopyrite recovery was not influenced. Contact angle, zeta potential and adsorption results showed that Ca2+ and CaOH+ absorbed on the talc surface and increased the absorption amount of N-carboxymethyl chitosan on the mineral surface, and increased hydrophilicity of talc surface, resulting the selective depression for talc in chalcopyrite flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 108-115
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 87.

Tytuł:

QSAR study of amine collectors for iron ore reverse flotation

Autorzy:

Wang, Benying
Xu, Xinyang
Duan, Hao
Wang, Xinyang

Powiązania:

https://bibliotekanauki.pl/articles/110929.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

QSAR
separation efficiency
reverse flotation
amine collectors

Opis:

In order to reveal the relationship between flotation behaviors of collectors and their structures, quantitative structure–activity relationship (QSAR) study about separation efficiency of quartz from hematite using amine collectors was performed. The genetic function approximation (GFA) algorithm was applied to generate the correlation models and model with acceptable R² and R_cv² (cross validated R-squared) correlation coefficients (R²=0.9666, R_cv²=0.9201) was developed. The model revealed that the Lowest Unoccupied Molecular Orbital (LUMO) energy of the molecule, the charge of nitrogen and the electronegativity of polar group were the major factors that affected the separation efficiency of collectors. The higher nitrogen charge, the larger electronegativity of polar group and the more positive of LUMO energy of amine collectors were, the higher separation efficiency would be.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1059-1069
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 88.

Tytuł:

Mineralogical study and enhanced gravity separation of gold-bearing mineral, South Eastern Desert, Egypt

Autorzy:

El-Sayed, Samah
Abdel-Khalek, N. A.
El-Shatoury, E. H.
Abdel-Motelib, A.
Hassan, M. S.
Abdel-Khalek, M.A.

Powiązania:

https://bibliotekanauki.pl/articles/1845207.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

gold
mineralogy
petrography
gravity separation
Falcon concentrator

Opis:

El-Hudi gold deposit, located in the South Eastern Desert of Egypt, represent large vein- type gold occurrence. The representative sample revealed the abundance of quartz as main constituent with minor amounts of mineral impurities. Gold was detectable (12 g/t) as determined using atomic absorption. The petrographic study revealed that the gold grains ranged from 10-40 μm. The grain boundaries of quartz are highly stained with iron minerals as hematite and limonite. Sericite mineral is common in discrete gold-bearing veins. Eroded pyrite was detected with high alteration leaving only cubic-shaped cavities behind. Different techniques for gravity separation were used to separate gold from the quartz mineral. After crushing and grinding of the sample, shaking table was used to upgrade the coarser fractions while Falcon concentrator was employed to upgrade the fine fraction. The best concentrate was obtained through grinding the whole sample to less than 0.2 mm, followed by cleaning steps. The gold content is increased from 12 to 145 g/t with total recovery of 78%.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 5; 839-848
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 89.

Tytuł:

Enrichment of wollastonite with high calcite content

Autorzy:

Şavran, Ceyda
Türk, Tülay
Kangal, Murat Olgaç
Irgasheva, Ganjinakhon

Powiązania:

https://bibliotekanauki.pl/articles/2146878.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

wollastonite
calcite
flotation
magnetic separation
lankropol OPA

Opis:

Wollastonite plays a significant role as an industrial raw material in many fields; its exclusive properties mean that it is used in ceramics, paint, metallurgy and coatings. In nature, wollastonite mostly occurs with calcite. While the most common method for separating wollastonite from calcite is calcination, flotation is one of the methods for separating two minerals in a more economic, environmentally friendly way. In this study, the ore contains a large amount of calcite and augite, which is an iron bearing mineral that is subjected to magnetic separation, followed by flotation in order to obtain wollastonite and calcite concentrations individually. The SiO2, CaO and Fe2O3 contents in the ore are 28.00%, 48.20% and 0.45%, respectively. After magnetic separation has reduced the iron content, flotation experiments are carried out to find the optimum conditions. For the flotation process, the effect of particle size, pH and collector dosage are investigated. A wollastonite concentration of 84% purity is successfully achieved, with a 0.17% iron concentration under the optimal conditions of 100 micron particle size, pH 8 and 500 g/t collector dosage. The purity of the calcite is raised to 95% with the application of a cleaning stage.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 153058
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 90.

Tytuł:

A nanoparticle cationic polystyrene-co-poly(n-butylacrylate) collector to eliminate the negative effect of lizardite slimes in pyrite flotation

Autorzy:

Ai, Guanghua
Liu, Cheng
Zhu, Guangli
Yang, Siyuan

Powiązania:

https://bibliotekanauki.pl/articles/24085927.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

nanoparticle collector
pyrite
lizardite slimes
flotation separation

Opis:

Lizardite slime coating is one of significant factors in the deterioration of the floatability of sulphide minerals. In this study, a nanoparticle cationic polystyrene-co-poly(n-butylacrylate)(PS-PBNH) collector was introduced to eliminate the negative impact of lizardite slimes in pyrite flotation. Microflotation results demonstrated that lizardite slims did not affect the recovery of pyrite in the presence of PS-PBNH. Good flotation separation of pyrite from lizardite was achieved when the nanoparticle PS-PBNH collector was used. The results from adsorption study indicated that PS-PBNH exhibited a significant adsorption on the pyrite surface in the presence of lizardite slimes. Sedimentation tests showed that hetero-aggregation occurred between lizardite slimes and pyrite, whereas the introduction of PS-PBNH collector resulted in a heterogeneous dispersion between them. Zeta potential measurements suggested that PS-PBNH collector interacted with pyrite surface, and the PS-PBNH adsorption changed the surface charge of pyrite from negative to be positive. As a result, the interaction of pyrite with lizardite shifted from electrostatic attraction to electrostatic repulsion, as supported by the DLVO calculations. These results indicated PS-PBNH can be used as a potential collector for pyrite flotation in pyrite/lizardite slimes system without the need for a depressant.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 170899
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 91.

Tytuł:

Effect of spiral vanes width on the separation performance of a hydrocyclone

Autorzy:

Liu, Peikun
Wang, Xiaoguo
Jiang, Lanyue
Zhang, Yuekan
Yang, Xinghua
Li, Xiaoyu
Wang, Hui

Powiązania:

https://bibliotekanauki.pl/articles/27323656.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

hydrocyclone
vane width
numerical simulation
separation performance

Opis:

Aiming at the problem of “entrainment fine particles in underflow” of hydrocyclone in grinding and classification process, a hydrocyclone with spiral vanes (the SV hydrocyclone) was proposed. The CFD techniques were used to study the pressure field, velocity field, turbulence field, particle field and classification efficiency of hydrocyclones with spiral vanes of different widths. The results show that the pressure drop, axial velocity, tangential velocity, turbulence intensity of SV hydrocyclone are reduced in different degrees compared with conventional hydrocyclone, and the reduction becomes more obvious with the increase of vane width. In the case of a vane width of 0.04D, the underflow recovery rate of 5μm and 10μm fine particles was reduced by 16.2% and 15.7%. The selection of spiral vanes with small widths is beneficial to improve the separation accuracy of fine particles and reduce the cut particle size.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 173563
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 92.

Tytuł:

Threshing and grain separating mechanism with differentiate concave for intensification of threshing and grain separation
Urządzenie młócąco-separujące kombajnu ze zmienną szczeliną nad klepiskiem intensyfikującą omłot i czyszczenie ziarna

Autorzy:

Klochkov, A. V.
Gusarov, V. V.
Kuboń, M.
Kamiński, J. R.

Powiązania:

https://bibliotekanauki.pl/articles/94003.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Inżynierii Rolniczej

Tematy:

combine harvester
threshing mechanism
separation mechanism
differentiate concave
threshing
separation
kombajn zbożowy
urządzenie młócąco-separujące
klepisko
omłot
separacja

Opis:

The objective of the paper was intensification of the process of thresh-ing and grain separation by a rasp-bar threshing mechanism of a combine harvester with a differentiate concave; substantiation of a regular-style design and differentiate concave parameters as well as threshing and separating mechanism operation modes. Theoretical research has been conducted based on laws of motion, experimental investigation - in accordance with methods devised on the basis of conventional methodologies. Standard computing methods as well as Microsoft Exсel and Mathcad application packages have been used for processing experimental data. Measuring and recording equipment has been used in the research process. Experimental investigation has been carried out on specially devised experimental assemblies. The research has enabled: to substantiate the design-manufacturing process of the threshing and separating mechanism with a differentiate concave; to establish analytical dependencies to determine the area of typical influence zones of a threshing drum and concave on threshing mass; to ascertain the regularity of stem deformation under the influence of different forces regulated by changing the distance between concave transverse slats; to figure out the regression equation enabling finding optimal process variables for a threshing and separating mechanism with a differentiate concave. The scientific novelty of the engineering solutions is confirmed by a patent of the Republic of Belarus for the utility model № 6335 « Tresking mechanism». The results of theoreti-cal and experimental research have been used in developing design documentation for the production of a differentiate concave for combine harvesters PA «Gomselmash».
Celem badań była intensyfikacja procesu omłotu i separacji ziarna bębnowym młócąco-separującym urządzeniem kombajnu zbożowego, mającym zmienną szczelinę nad klepiskiem. Określenie racjonalnej konstrukcji i parametrów szczeliny klepiska, a także reżimów pracy bębna młócącego. Rozważania teoretyczne prowadzono na bazie zasad mechaniki, a eksperymenty w oparciu o metodyki ogólne i specjalne. Do obróbki wyników wykorzystano metody standardowe obliczeń i pakiety praktycznych programów Microsoft Excel i MathCAD. Do pomiarów wykorzystano aparaturę pomiarowo-rejestrującą. Badania eksperymentalne prowadzono na specjalnie przygotowanych eksperymentalnych stanowiskach. Przeprowadzone badania pozwoliły: uzasadnić konstrukcyjno-technologiczne schematy bębna młócącego ze zmienną szczeliną nad klepiskiem, znaleźć analityczne zależności dla określenia charakterystycznych zakresów powierzchni oddziaływania bębna młócącego i klepiska na młóconą masę, ustalić zasady odkształcania słomy pod działaniem różnych sił przy zmiennym rozstawie między poprzecznymi listwami klepiska, otrzymać równania regresji, pozwalające określić optymalne technologiczne parametry pracy bębna młócącego ze zmienną szczeliną nad klepiskiem. Nowość naukowa opracowanych rozwiązań technicznych została potwierdzona patentem Republiki Białoruskiej na wzór użytkowy Nr 6335 „Bęben młócący”. Rezultaty teoretycznych i eksperymentalnych badań wykorzystano podczas opracowania dokumentacji konstrukcyjnej do wykonania drgającego klepiska do kombajnów produkcji ПО «Гомсельмаш».

Źródło:

Agricultural Engineering; 2017, 21, 3; 29-45
2083-1587

Pojawia się w:

Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 93.

Tytuł:

Effectiveness of the pneumatic separation of Norway spruce Picea abies (L.) Karst seeds

Autorzy:

Tylek, P
Walczyk, J.

Powiązania:

https://bibliotekanauki.pl/articles/41337.pdf

Data publikacji:

2004

Wydawca:

Polska Akademia Nauk. Instytut Dendrologii PAN

Tematy:

Norway spruce
Picea abies
seed
pneumatic separation
separation effectiveness
critical velocity
seed sorting
seed mass
seed fraction
seed density

Opis:

The paper presents the theoretical basis for the pneumatic separation of Norway spruce seeds along with the results of investigations into the effectiveness of separation conducted in a pneumatic separator with a vertical air column. Such a separator was designed and produced at the Department of Forest Works Mechanization of the Agricultural University of Kraków. The device makes it possible to separate a mixture into three fractions based on the differences in critical velocities. The variation in density among different seed fractions is about two times lower than the variation in seed mass. This result supports the suggestion that omitting the size calibration of seeds before their pneumatic separation could lead to the dominance of seed density as a distinguishing feature.

Źródło:

Dendrobiology; 2004, 51 Supplement
1641-1307

Pojawia się w:

Dendrobiology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 94.

Tytuł:

Study on the mechanism of the difference in flotation performance between fine-grained crystalline SiO2 and amorphous SiO2

Autorzy:

Ma, Saisai
Li, Jie
Wang, Yonglun
Wei, Bangqi

Powiązania:

https://bibliotekanauki.pl/articles/27323646.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation separation
heteromorphism
infrared spectrum calculation
DLVO theory

Opis:

Numerous minerals found in nature contain silica, including quartz, cristobalite, opal, etc. They have the same chemical composition but different crystal structures, and this phenomenon is called “polymorphism” in mineralogy. For these polymorphic and multi-like minerals, in the flotation process, will it directly or indirectly affect the flotation effect. Based on this, this study mainly explores the difference between crystalline SiO2 and amorphous SiO2 in flotation. In this study, two crystal forms of SiO2 were subjected to flotation and adsorption capacity tests. FTIR, other test techniques, the chemical calculation of the flotation solution, and the theoretical calculation of the DLVO can all be used to provide an explanation. Finally, in the flotation experiment, the feedbacks of the two minerals to the change of the pH value of the pulp and the change of the concentration of the reagent are different. Through the comprehensive analysis of the adsorption capacity test and semi-quantitative calculation of the infrared spectrum, the adsorption capacity of crystalline SiO2 to drugs is about 23% higher than amorphous SiO2. Furthermore, during the flotation process, the amorphous SiO2 particles will agglomerate together and entrain into the foam through, resulting in concentrate pollution. So amorphous SiO2 will undoubtedly increase the difficulty of flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174567
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 95.

Tytuł:

Purification and Characterization of a Low Molecular Weight Neutral Non-Starch Polysaccharide from Panax ginseng by Enzymatic Hydrolysis

Autorzy:

Ying, Ying
Ma, Chao
Zhang, Yajie
Li, Xiaoping
Wu, Hongxin

Powiązania:

https://bibliotekanauki.pl/articles/16538536.pdf

Data publikacji:

2023-02-21

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

ginseng polysaccharide
chromatographic separation
monosaccharide composition
structure analysis

Opis:

In this study, a novel neutral non-starch polysaccharide (GP1A) was extracted using hot water from ginseng roots. Chemical characteristics, monosaccharide compositions and structure of GP1A were investigated using scanning electron microscopy, gel permeation chromatography, X-ray diffraction, Fourier transform infrared spectroscopy, gas chromatography with mass spectrometer, one-dimensional and two-dimensional nuclear magnetic resonance. The results indicated that the lyophilized GP1A was a homogeneous polysaccharide with a low molecular weight of 1.03 kDa. The dominating monosaccharides of GP1A were D-glucose, D-galactose, D-mannose, D-xylose and D-arabinose. The structure analysis indicated the main chain residues sequence of GP1A was α-D-Glcp-(6→3)-α-D-Galp-(1→1)-α-D-Glcp-(3→4)-β-D-Manp-(2→2)-β-D-Arap with branch chains of α-D-Glcp substituted at α-D-Galp and β-D-Xylp substituted at β-D-Manp.

Źródło:

Polish Journal of Food and Nutrition Sciences; 2023, 73, 1; 70-79
1230-0322
2083-6007

Pojawia się w:

Polish Journal of Food and Nutrition Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 96.

Tytuł:

Vlijanie grupp tribologicheskikh parametrov na koehfficienty trenija semjan po frikcionnykh poverkhnostjakh separatorov
Influence group tribological parameters on the friction coefficient of the friction surfaces seeds separators

Autorzy:

Kovalyshyn, S.
Kovalchyk, Y.
Dadak, V.

Powiązania:

https://bibliotekanauki.pl/articles/77749.pdf

Data publikacji:

2015

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

seed
separation
friction coefficient
friction surface
contact area

Źródło:

Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
1730-8658

Pojawia się w:

Motrol. Motoryzacja i Energetyka Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 97.

Tytuł:

Zastosowanie separacji membranowej do uzdatniania biogazu
The biogas upgrading by membrane separation

Autorzy:

Janusz-Cygan, Aleksandra
Tańczyk, Marek
Jaschik, Jolanta
Wojdyła, Artur
Sołtys, Elżbieta

Powiązania:

https://bibliotekanauki.pl/articles/1955369.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN

Tematy:

separacja membranowa
biogaz
biometan
membrane separation
biogas
biomethane

Opis:

Przeprowadzono analizę możliwości zatężania metanu pochodzącego z syntetycznych mieszanin gazowych o składzie zbliżonym do biogazu w komercyjnym module membranowym firmy Air Products. Przeprowadzono doświadczalne badania procesu permeacji czystego metanu i ditlenku węgla oraz badania separacji mieszanin CH4/CO2 zawierających 50 lub 60% obj. CH4. W wyniku przeprowadzonych badań stwierdzono, że moduł ten można zastosować do uzdatniania biogazu do biometanu.
An analysis was carried out of the possibility of concentrating methane from a synthetic biogas in an Air Products membrane module. Experimental investigations concerning the permeation of pure gases and mixture of these gases containing 50 and 60 vol.% of methane and carbon dioxide, were carried out. An important conclusion from the investigationt is that this module can be used for the upgrading of biogas to biomethane.

Źródło:

Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2020, 24; 83-94
1509-0760

Pojawia się w:

Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 98.

Tytuł:

On the intersection product of analytic cycles

Autorzy:

Rams, Sławomir

Powiązania:

https://bibliotekanauki.pl/articles/1208021.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Matematyczny PAN

Tematy:

improper intersection
regular separation
extended index of intersection

Opis:

We prove that the generalized index of intersection of an analytic set with a closed submanifold (Thm. 4.3) and the intersection product of analytic cycles (Thm. 5.4), which are defined in [T₂], are intrinsic. We define the intersection product of analytic cycles on a reduced analytic space (Def. 5.8) and prove a relation of its degree and the exponent of proper separation (Thm. 6.3).

Źródło:

Annales Polonici Mathematici; 2000, 73, 2; 135-146
0066-2216

Pojawia się w:

Annales Polonici Mathematici

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 99.

Tytuł:

Wpływ jakości nadawy na jakość produktów wzbogacania ocenianych za pomocą wykresu Fuerstenaua dla przypadku symetrycznej krzywej separacji
Influence of feed quality on quality of separation products evaluated by means of the fuerstenau plot for symmetrical separation curves

Autorzy:

Duchnowska, M.
Drzymała, J.

Powiązania:

https://bibliotekanauki.pl/articles/216515.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN

Tematy:

wzbogacanie
separacja
selektywność
flotacja
upgrading
separation
selectivity
flotation

Opis:

Jeżeli wyniki wzbogacania dają się opisać na tzw. wykresie Fuerstenaua krzywą opisywaną równaniem matematycznym z jednym dopasowywanym parametrem, wtedy parametr ten może być wykorzystany jako wskaźnik selektywności wzbogacania. Jeżeli równanie to ma postać [...] (gdzie \epsilon oznacza uzysk składnika użytecznego w koncentracie, a [...] uzysk nieużytecznego składnika w odpadzie), wtedy przy stałej selektywności wzbogacania (stałe a) wzrost zawartości składnika użytecznego w nadawie \alfa powoduje, że następuje wzrost ilości składnika użytecznego zarówno w koncentracie \beta jak i w odpadzie \theta, przy czym przy stałym uzysku składnika użytecznego w koncentracie \epsilon stosunek \theta do \beta rośnie liniowo z \alfa. Oznacza to, że przy stałej selektywności procesu separacji a oraz stałym uzysku składnika użytecznego w koncentracie \epsilon wzrost zawartości składnika użytecznego w nadawie \alfa powoduje większy wzrost ilości składnika użytecznego w odpadzie niż w koncentracie.
When mineral processing separation results, for either constant or varying quality of the feed, can be approximated on the so-called Fuerstenau upgrading plots with the same one-fitting parameter a, then this parameter can be used as a selectivity indicator. If the equation has a form [...], where [...] stands for recovery of non-useful component in tailing while\ksi is the recovery of useful component in the concentrate, then at the same selectivity of upgrading (constant a) the increase of the useful component in the feed \alfa results in an increased amount of this component in both concentrate \beta and tailing [...] while the ratio of [...] to \beta is linearly dependent on \alfa when \epsilon is constant. Thus, at a constant selectivity a and constant \epsilon an increase in \alfa leads to a greater increase of the considered component in the tailing \theta than in the concentrate \beta.

Źródło:

Gospodarka Surowcami Mineralnymi; 2011, 27, 2; 33-41
0860-0953

Pojawia się w:

Gospodarka Surowcami Mineralnymi

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:

Manufacturing and characterization of resorbable PLGA membranes for biomedical applications

Autorzy:

Krok, M.
Ferreira, C.
Fernandes, S.
Kościelniak, D.
Dobrzyński, P.
Pamuła, E.

Powiązania:

https://bibliotekanauki.pl/articles/284710.pdf

Data publikacji:

2011

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

PLGA
PEG
porous membrane
phase-separation method
GTR

Opis:

Porous poly(L-lactide-co-glycolide) (PLGA) membranes were prepared by solvent-casting/porogen leaching method. Poly(ethylene-glycol) (PEG) with two molecular weights was used as a pore former. Mechanical properties of the membranes were analyzed in tensile test. Topography, pore size and surface roughness were characterized by atomic force microscopy on both sites of the membranes. PEG leached out percentage, thickness and wettability were also measured. Osteoblast-like cells were cultured on the membranes for 24 h and 6 days, and morphology, distribution and number of adhered cells as well as secretion of proteins and nitric oxide were measured. The results show that PEG molecular weight affected size and distribution of pores on both surfaces of the membranes. It resulted also in different mechanical characteristics of the membranes. In vitro experiments show that the membranes support adhesion and growth of osteoblast-like cells suggesting their usefulness for guided tissue regeneration (GTR).

Źródło:

Engineering of Biomaterials; 2011, 14, 104; 8-13
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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