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Tytuł:
$L^q$-spectrum of the Bernoulli convolution associated with the golden ratio
Autorzy:
Lau, Ka-Sing
Ngai, Sze-Man
Powiązania:
https://bibliotekanauki.pl/articles/1217803.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
Bernoulli convolution
golden ratio
multifractal measure
$L^q$-spectrum
$L^q$-dimension
Hausdorff dimension
renewal equation
self-similarity
Opis:
Based on a set of higher order self-similar identities for the Bernoulli convolution measure for (√5-1)/2 given by Strichartz et al., we derive a formula for the $L^q$-spectrum, q >0, of the measure. This formula is the first obtained in the case where the open set condition does not hold.
Źródło:
Studia Mathematica; 1998, 131, 3; 225-251
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The dynamics of the surface layer of lipid membranes doped by vanadium complex : computer modeling and EPR studies
Autorzy:
Olchawa, R.
Man, D.
Pytel, B.
Powiązania:
https://bibliotekanauki.pl/articles/147585.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EPR probe
lipid membrane
membrane fluidity
Monte Carlo simulation
Opis:
Penetration of the liposome membranes doped with vanadium complex formed in the liquid-crystalline phase from egg yolk lecithin (EYL) by the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) spin probes has been investigated. The penetration process was followed by 360 hours at 24◦C, using the electron spin resonance (EPR) method. The spectroscopic parameter of the partition (F) of this probe indicated that a maximum rigidity of the membrane was at 3% concentration of the vanadium complex. Computer simulations showed that the increase in the rigidity of the membrane corresponds to the closure of gaps in the surface layer of the membrane, and indicates the essential role of the membrane surface in transport processes.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 395-398
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historic cost versus fair value
Koszt historyczny kontra realna wartość rynkowa
Autorzy:
Man, M.
Ravas, B.
Gadau, L.
Powiązania:
https://bibliotekanauki.pl/articles/406165.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
koszt historyczny
wartość rynkowa
międzynarodowe standardy rachunkowości
MSR
międzynarodowe standardy sprawozdawczości finansowej
MSSF
dane księgowe
zasady rachunkowości
wydajność
historic cost
fair value
International Accounting Standards
IAS
International Financial Reporting Standards
IFRS
accounting data
accounting principles
performance
Opis:
The value of accounting registering based upon historic cost is a sure and checkable value, written in a document that certifies a property right upon a certain good, a debt right or a debt. Historic costs' evaluation consists in registering goods in-comings into the company's patrimony at their buying cost, namely their historic cost, with no further modification although the real value changes. Fair value is the foundation of IFRS referential which displays basic principles, largely inspired by US GAAP, although they are not mentioned by them. Fair value evaluation is opposed to the principle of prudence, one of the main principles of French accounting law (also taken over by Romanian accounting standards) owing to which only possible losses are registered while potential profits are ignored. The issues that occur refer to the impact of the evaluation according to the fair value upon the accounting data of the company, namely upon the balance sheet and the results account drawn out on the basis of the fair value registrations. At the same time, the evaluation according to the fair value has determined a new foundation in displaying a company's performance. This issue determines the following question: "Which is closer to the truth and more credible? A result calculated according to the fair value or one which is founded upon historic cost?".
Wartość ewidencji księgowej oparta o koszt historyczny jest z pewnością wartością sprawdzalną, zapisaną w dokumencie, który poświadcza prawo własności do określonych dóbr, prawo do długu i dług. Ocena kosztu historycznego polega na ewidencji dóbr wchodzących w skład dziedzictwa przedsiębiorstwa po kosztach zakupu, mianowicie ich koszt historyczny bez dalszych modyfikacji, mimo że wartość rzeczywista zmienia się. Realna wartość rynkowa jest podstawą odniesienia IFRS, który przedstawia podstawowe zasady, szeroko proponowane przez US GAAP, chociaż nie są przez nich wspominane. Realna wartość rynkowa jest w opozycji do zasady przezorności, jednej z głównych zasad francuskiego prawa księgowego (przejętego także przez rumuńskie standard księgowe), zgodnie z którą tylko możliwe straty są ewidencjonowane podczas gdy potencjalne zyski są ignorowane. Podjęte zagadnienie odnosi się do wpływu oceny zgodnie z realną wartością rynkową na podstawie danych księgowych przedsiębiorstwa, mianowicie na podstawie bilansu i wyników księgowych otrzymanych na podstawie ewidencji realnej wartości rynkowej. Jednoczśnie, ocena na podstawie realnej wartości rynkowej określiła nowe podstawy w prezentacji wydajności przedsiębiorstwa. Zagadnienie warunkuje następujące pytanie: Które jest bliżej prawdy i bardziej wiarygodne? Wynik obliczony zgodnie z realną wartością rynkową czy ten oparty na koszcie historycznym?.
Źródło:
Polish Journal of Management Studies; 2011, 4; 135-150
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of humic substances on the liposome structures : ESR method
Autorzy:
Man, D.
Pisarek, I.
Braczkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/147392.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EYL liposome
ESR method
humic substances
Opis:
In this paper the changes of membrane fluidity of liposome with additions of humic substances (humic and fulvic acids) were examined. Liposome were done by the sonication of lecithin EYL. Concentrations of humic substances in attitude to EYL varied between 0–10% of weight. The technique of electron spin resonance (ESR) were used for the examination followed by three spin probes with a variety placement of the membrane located. TEMPO probe melted in the hydrophobic membrane and in the aquatic solution which allowed to determine the spectroscopic partition parameter (F), indicating the changes that occur in water-lipid interphase. Probe 5-DOXYL placed directly under the heads of polar lipids and the order parameter measuring by the TII showed the changing of membrane fluidity at surface area. 16-DOXYL probe penetrated the middle of the lipid bilayer membrane and allowed to determine the rotational correlation time τ parameter, which gives us information about changing of the liquidity lipid bilayer. Studies showed that the tested humic substances significantly changed the membrane fluidity of liposome. The dynamics of this process depends on both: the fraction of humic substances and its quality and quantity as well as the placement area of the membrane.
Źródło:
Nukleonika; 2013, 58, 3; 439-442
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A case study on the determination of the excavated trench depth in unsaturated soil constructed by trench method without supporting structures
Określania głębokości wykopu w gruncie suchym metodą wykopu bez konstrukcji wsporczych case study
Autorzy:
Nguyen, Xuan Man
Do, Thi Them
Powiązania:
https://bibliotekanauki.pl/articles/317802.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
wykopy
głębokość
badania
excavation
depth
testing
Opis:
Together with the excavated width, the depth of trench play a vital role in stability as well as economics effectiveness of a trench constructed by open trench method. It is widely recognized that a steeper angle of an open trench, a smaller amount the excavated soil required; however, the trench is unstable. In this case, an external supporting structure system is obliged to prevent the trench from falling into the excavation zone. In addition, an open trench is normally located above the water table, hence under unsaturated condition. One of the most important characteristics of unsaturated soil is negative pore water pressure which brings about the matric suction, higher negative pore water pressure, higher matric suction; consequently, higher shear strength of soil. On the other hand, there is a few theories and research works have been reported on the method of determining a suitable depth of a trench under unsaturated condition. Previous works tend to assume that the distribution of matric suction is either constant or linear with depth; as a result of this, the designed results are often overestimated compared to practical results. In this paper, the effect of distribution of matric suction was taken into account to propose an equation to estimate the depth of a trench that can be applied without supporting structure. Finally, an example of numerical calculation of a depth of the open trench was described.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 80-88
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acoustic analysis of monophthongs, diphthongs, and triphthongs in Mandarin for 3- to 5-year-old children with articulatory phonological disorders
Autorzy:
Chu, Man-ni
Syu, Jia-ling
Powiązania:
https://bibliotekanauki.pl/articles/1040263.pdf
Data publikacji:
2018-12-30
Wydawca:
Katolicki Uniwersytet Lubelski Jana Pawła II
Tematy:
articulatory phonological disorders
monophthong
diphthong
triphthong
Mandarin
Opis:
Ten 3- to 5-year old children (5M, 5F) who were diagnosed as children with articulatory phonological disorders (CWAPD) and attending a therapy program were recruited to participate in a ‘repeat-after-her’ experiment. They were asked to produce a total of 85 real Mandarin words, including 28 monophthongs, 41 diphthongs, and 16 triphthongs. The results indicated that CWAPD have no problem producing monophthongs. However, attempts to articulate diphthongs and triphthongs induced more errors. CWAPD showed more errors when producing words with 1st sonorant diphthongs than words with 2nd sonorant diphthongs—this is because the least sonorant segment in the last position is prone to distortion. Similar phenomena were found in other triphthongs, except with /iai/ and /iou/, which did not see deviant pronunciation. Comparing our study to the information provided by two therapists showed that the participating CWAPD encountered difficulties in producing multi-vowel syllables, where the position and sonorant matters. In addition, our results also reveal a similar vowel acquisition order among CWAPD as among normal children.
Źródło:
Linguistics Beyond and Within; 2018, 4; 7-21
2450-5188
Pojawia się w:
Linguistics Beyond and Within
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Plesiomonas shigelloides strain CNCTC 144/92 lipopolysaccharide on DPPC liposome membranes: EPR method
Autorzy:
Man, D.
Pytel, B.
Pisarek, I.
Powiązania:
https://bibliotekanauki.pl/articles/1054999.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.16.Dg
87.64.kh
87.80.Lg
Opis:
Membrane fluidity measurements were performed for synthetic DPPC liposomes sonicated in aqueous solution and doped by Plesiomonas shigelloides strain CNCTC 144/92 (serotype O74:H5) lipopolysaccharide (LPS) extracted from the phenol (LPS_{PhOH}) and water (LPS_{H₂O}) phases. Concentrations of LPS in relation to DPPC ranged from 0 to 1.4% (molar ratio). The EPR spin probe method was used to describe physicochemical properties of different regions of the lipid bilayer. Since TEMPO spin probe dissolves both in the hydrophobic region of the membrane and in an aquatic environment it is possible to determine the spectroscopic partition parameter F, indicating the changes that occur in the water-lipid interface. The 16-DOXYL probe distributed in the middle of the lipid bilayer makes it possible to obtain the rotational correlation time τ parameter, which provides information about fluidity changes in the liposome membrane. Here we report that increasing concentrations (mainly in the range of 0.4-0.8%) of investigated LPS_{PhOH} and LPS_{H₂O} significantly influence spectroscopic parameters (F and τ). The surface area of the DPPC liposomes membranes was affected predominantly by LPS_{H₂O} while the lipid bilayer was most influenced by LPS_{PhOH}.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 77-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the seismic performances of structures reinforced by self-centering buckling-restrained braces
Autorzy:
Jin, Yongxu
Xu, Man
Jia, Jie
Powiązania:
https://bibliotekanauki.pl/articles/27312160.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
budynek wysokościowy
stabilizator wyboczeniowy samocentrujący
wysięgnik
rozpraszanie energii
właściwości sejsmiczne
super-high raise building
self-centering buckling-restrained brace
outrigger truss
energy dissipation
seismic performance
Opis:
The self-centering buckling-restrained brace (SC-BRB) may achieve self-restoration for structures and, to a certain degree, diminish the substantial seismic residual deformation following rare earthquakes when compared to the usage of the conventional buckling-restrained brace (BRB). It may be possible to reduce the abrupt change in stiffness at the location of the strengthened stories and make the outrigger better at dissipating energy by improving the design of the energy-dissipation outrigger. This study compares the seismic performances of two types of energy-dissipation outriggers with BRB and SC-BRB web member designs during rare earthquakes so that the changes can be measured. The results show that using the SC-BRB web member design reduces the maximum inter-story drift ratio by an average of 7.68% and increases the average plastic-energy dissipation of the outrigger truss by 8.75%. The evaluation results showthat the SC-BRB outrigger truss structure has better structural regularity and energy-dissipation performance. It has the ability to efficiently regulate the structural seismic response and lessen primary-structure damage.
Źródło:
Archives of Civil Engineering; 2023, 69, 3; 645--663
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Towards a pluralistic epistemology: understanding human-technology interactions in shipping from psychological, sociological and ecological perspectives
Autorzy:
Man, Y.
Lundh, M.
MacKinnon, S. N.
Powiązania:
https://bibliotekanauki.pl/articles/116821.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
pluralistic epistemology
epistemology
human-technology interactions
shipping
psychological perspective
sociological perspective
ecological perspective
Human Computer Interaction (HCI)
Opis:
In the shipping domain, many innovative technical systems have been designed and developed in the past decades, aiming to enable the maritime users to achieve the goal of safety, efficiency and effectiveness. The introduction of advanced technologies into workplaces have also created unprecedented challenges. Human users frequently find themselves in a supporting role to serve technology, being responsible for automation issues and blamed for “human errors” that sometimes result in tragic results. These challenges are closely associated with the design and use of technologies. Human‐technology interactions has become an important multidisciplinary research topic for shipping. This article reviews theoretical concepts relative to the dimensions of psychology, sociology and ecology in Human Computer Interaction (HCI) in order to form a deeper understanding of human‐technology interactions. This paper also discusses the theoretical constructs’ practical relevance by showing how a few cases exemplifying ongoing development sectors in shipping, such as energy efficiency optimisation, supervisory control of autonomous unmanned ships, and eco‐systems in engine control rooms, are understood with these theoretical perspectives. By presenting multidisciplinary understandings of human‐technology interaction, this paper aims to derive knowledge pertinent to methodological approaches and philosophical stances of future maritime human factors and HCI research.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 4; 795-811
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Abraham Maslow's motivation theory for setting consumers' satisfaction-non-satisfaction
Wykorzystanie teorii motywacji Abrahama Maslowa w kształtowaniu satysfakcji bądź dyssatysfakcji klientów
Autorzy:
Dima, I. C.
Man, M.
Kot, S.
Powiązania:
https://bibliotekanauki.pl/articles/405979.pdf
Data publikacji:
2010
Wydawca:
Politechnika Częstochowska
Tematy:
potrzeba motywacji
satysfakcja
niezadowolenie
postrzeganie jakości
realne oczekiwania
need motivation
satisfaction
dissatisfaction
perceived quality
reality expected
Opis:
Behind a consumer's decision to purchase a product/service there is always a reason or a complex of reasons, and behind rejecting a product/service there is always the consumer's conclusion that, by its competences, that respective product/service will not fulfil that respective need at the level one desires. In order to explain the internal origins of consumers' behaviour, the contemporary psychology applies to the concepts of "needs" (necessities) and "motivations". The relation between these two categories consists in the needs which become antecedent conditions for determining the occurrence of motivations.
Każda decyzja klienta dotycząca nabycia produktu lub usługi poparta jest jakimś powodem lub zespołem takich powodów. Rezygnacja z produktu/usługi wiąże się z wnioskowaniem klienta, który dzięki swoim kompetencjom wie, że dany produkt/usługa nie spełni jego indywidualnych potrzeb na wymaganym przez niego poziomie. Aby wyjaśnić pierwotne pochodzenie zachowania konsumentów, współczesna psychologia stosuje koncept potrzeby oraz motywacji. Związek pomiędzy tymi dwoma kategoriami wywodzi się od potrzeb, które są czynnikami poprzedzającymi wystąpienie motywacji.
Źródło:
Polish Journal of Management Studies; 2010, 2; 132-138
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The risk management organizational entities
Zarządzanie ryzykiem w jednostkach organizacyjnych
Autorzy:
Man, M.
Radu, S. M.
Tabor, J.
Powiązania:
https://bibliotekanauki.pl/articles/406235.pdf
Data publikacji:
2015
Wydawca:
Politechnika Częstochowska
Tematy:
risk
uncertainty
risk assessment
failure
unpredictability
ryzyko
niepewność
ocean ryzyka
błąd
nieprzewidywalność
Opis:
The place and role of risk in managerial activity must be analysed by taking into account the relation where the two concepts about risk are, namely: The concept suggested by the decision theory and concept suggested by managers. It is necessary to take into account managers’ behaviour towards the risk defined by the theory of choice, which leads to the following conclusion: managers actually assume risks and express preferences in terms of risk, using techniques and procedures – other than the traditional ones – such as media, variation of probabilistic distributions of possible outcomes, etc. Understanding the concept of "risk" by managers leads to a certain attitude they have towards risk characterised by three essential features and namely: managers' low sensitivity to probabilistic assessments of the possible results; managers' wilful mobilisation on some key objectives and decisive influence of this mobilisation on managerial decisions; clear distinction between managers assuming the rick and game of hazard. These features combined with the individual and organisational decisions highlight the impossibility of the classical conception of "risk" to enable a thorough and meaningful of the behavioural phenomenon of assuming the risk.
Miejsce i rola ryzyka w działalności menedżerskiej, muszą być analizowane z uwzględnieniem relacji, jaka zachodzi pomiędzy dwiema koncepcjami dotyczącymi ryzyka: koncepcją zaproponowaną przez teorię decyzji i koncepcją zaproponowaną przez menedżerów. Konieczne jest wzięcie pod uwagę zachowanie menedżerów, odnośnie ryzyka, zdefiniowanego przez teorię wyboru, z której wynikają następujące konkluzje: menedżerowie faktycznie przyjmują ryzyko i wyrażają pewne preferencje odnośnie ryzyka, przy wykorzystaniu technik i procedur – innych niż te tradycyjne – takie jak mediana, zmiany probalistycznych rozkładów możliwych wyników, itp. Rozumienie pojęcia "ryzyka" przez menedżerów prowadzi do określonej postawy wobec ryzyka, charakteryzującej się trzema zasadniczymi cechami, mianowicie: niską wrażliwością menedżerów na możliwe oceny probabilistyczne otrzymanych wyników; mobilizacją menedżerów odnośnie określonych, kluczowych celów i wpływem tej mobilizacji na podejmowane decyzje zarządcze; jasnym rozróżnieniem pomiędzy menedżerami podejmującymi ryzykowną grę. Te cechy, w połączeniu z indywidualnymi i organizacyjnymi decyzjami, podkreślają niemożliwość klasycznej koncepcji "ryzyka" umożliwiającej dokładne i znaczące pojmowanie ryzyko jako behawioralnego zjawiska.
Źródło:
Polish Journal of Management Studies; 2015, 11, 2; 115-126
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodical approach to Corporate Sustainability Planning
Podejście metodologiczne do Zbiorowego Planowania Stabilności
Autorzy:
Modrak, V.
Dima, I. C.
Man, M.
Powiązania:
https://bibliotekanauki.pl/articles/406239.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
zbiorowe planowanie stabilności
CSP
stabilność
analiza SWOT
corporate sustainability planning
sustainability
SWOT analysis
Opis:
The aim of this article is to present some methodical aspects of CSF. Corporate Sustainability Planning (CSP) can be defined as "the process of specific strategies and action plan development to help ensure the long-term goals". In generally, this presents a complex process and task which includes considering the full range of resources and competencies such as financial, political, administrative and managerial.
Celem niniejszego artykułu jest przedstawienie metodycznych aspektów CSF. Zbiorowego Planowania Stabilności (CSP-Corporate Sustainability Planning) można zdefiniować jako "proces konkretnych strategii i rozwoju planu działania na rzecz zapewnienia długoterminowych celów". Ogólnie artykuł przedstawia skomplikowane procesy i zadania, które należy rozważyć, w pełnym zakresie zasobów i kompetencji takich jak sprawozdania finansowe, polityczne, administracyjne i kierownicze.
Źródło:
Polish Journal of Management Studies; 2011, 3; 156-166
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the economical-mathematical modelling in the constructive preparation of production
Autorzy:
Dima, I. C.
Man, M.
Grabara, J.
Powiązania:
https://bibliotekanauki.pl/articles/123019.pdf
Data publikacji:
2013
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
constructive preparation
usage value
exchange value
esteem value
market value
customer value
integration of production
production scheduling
Opis:
The constructive preparation of industrial production aims at determining the physical and chemical properties, the external appearance and other elements regarding quality, which shall allow the product in question to meet the requirements of national economy in the fields of usage and consumer requirements. The starting point lies in the knowledge of the pursued goal, i.e. the product type and the requirements it must meet in terms of consumers and national economy. The knowledge of the destination of the new product and the usage thereof determines the technical solutions to be adopted.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2013, 12, 1; 21-32
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positioning of pre-university education into the national system of education of Romania
Znaczenie średniej edukacji w rumuńskim narodowym systemie edukacji
Autorzy:
Dima, I. C.
Man, M.
Ciurea, V.
Powiązania:
https://bibliotekanauki.pl/articles/405917.pdf
Data publikacji:
2010
Wydawca:
Politechnika Częstochowska
Tematy:
wykształcenie średnie
edukacja
kształcenie
system edukacji
proces zarządzania
pre-university education
cybernetic patterns
management process
Opis:
Defining the pre-university educational institution as fundamental unit of the national pre-university educational system takes into account the social function of the pre-university educational institution in relation to the structures this can define in time and space. The social function of the pre-university educational institution is determined by the teaching-learning-evaluating structure, based on: general pedagogic norms and principles, which, from a value point of view, orient the projects for organising the pre-university educational institution into the future; pedagogic programs socially accredited, stating a certain division of the work at the level of the pre-university educational institution; open pedagogic communication channels, providing the efficiency of the pre-university educational institution at a methodological level and in the durable relations with educative territorial and local communication. (JEL: I23, C51).
Określanie instytucji średniej edukacyjnej jako podstawowej jednostki narodowego systemu edukacji średniej należy uwzględnić funkcję społeczną takiej instytucji w odniesieniu do struktur definiowanych w danym miejscu i czasie. Społeczna funkcja instytucji średniej edukacji jest określona przez strukturę uczenie - nauczanie - ocenianie, opartą na: ogólnych normach pedagogicznych i zasadach, które z punktu widzenia wartości ustalają priorytety dla tych organizacji na przyszłość; programach pedagogicznych akredytowanych społecznie, wskazując pewien podział pracy w instytucji średniej edukacji; otwartych pedagogicznych kanałach komunikacyjnych, które zapewniają efektywność instytucji średniej edukacji pod względem metodologicznym i w powiązaniu z obszarami edukacyjnymi oraz lokalną komunikacją.
Źródło:
Polish Journal of Management Studies; 2010, 1; 104-112
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Marginal cost of industrial production
Marginalny koszt produkcji przemysłowej
Autorzy:
Man, M.
Modrak, V.
Grabara, J. K.
Powiązania:
https://bibliotekanauki.pl/articles/406200.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
koszt krańcowy
produkcja
wielkość produkcji
marginal cost
production
product volume
Opis:
One of the important issues of production management is the most efficient possible use of the production capacity as the global level of the production fixed expenses depends on the unit's production capacity and their level per product unit diminishes as the degree of employment of such a capacity tends to be optimum. Accordingly, to a certain volume of achieved production one may add or subtract, under certain circumstances, a certain volume (lot, stratum, and margin) of products; at the same time, the increase or the decrease of production volume determines the change of the total production costs of the unit. As the level of the total costs corresponding to the production that is going to be achieved until the adoption of the decision of increasing or decreasing production level already exists, and the sum total production costs are modified with is determined by the added or subtracted production volume (stratum, lot, and margin).
Jednym z ważnych zagadnień zarządzania produkcją jest jak najbardziej efektywne wykorzystanie mocy produkcyjnych jako globalnego poziomu dostosowanych wydatków produkcyjnych zależnych od mocy produkcyjnej jednostki a ich poziomu według zmniejszenia jednostki produkcji jako stopnia zatrudnienia jaki wydaje się być optymalny. W związku z powyższym, do pewnej wielkości osiągniętej przez produkcję może dodać lub odjąć, w pewnych okolicznościach, określonej wielkości (partii, warstwy, lub marży) produktów, w tym samym czasie, wzrost lub spadek wielkości produkcji określa zmiany całkowitych kosztów produkcji jednostki. Ponieważ poziom całkowitych kosztów odpowiadającej produkcji, który ma zostać osiągnięty do dnia przyjęcia decyzji zwiększenie lub zmniejszenie poziomu produkcji już istnieje, a sumy kosztów produkcji są modyfikowane co ustalane jest przez dodanie lub odjęcie wielkości produkcji (warstwy, partii, a marży).
Źródło:
Polish Journal of Management Studies; 2011, 3; 61-68
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of metal separation process from synthetic hydrochloric acid leaching solution of spent lithium ion batteries by solvent extraction and ion exchange
Autorzy:
Nguyen, Viet Nhan Hoa
Lee, Man Seung
Powiązania:
https://bibliotekanauki.pl/articles/1446393.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
spent lithium-ion batteries
solvent extraction
ion exchange
separation
Opis:
Spent lithium-ion batteries (LIBs) are good secondary resources for recycle and reuse. To develop a process for the separation of Cu(II), Co(II), Mn(II), Ni(II) and Li(I) with high purity from spent LIBs and circumvent some drawbacks of the previous work, solvent extraction and ion exchange experiments were done in this work. The synthetic hydrochloric acid leaching solution of 3 M was employed. Compared to Aliquat 336 (N-Methyl- N, N, N-trioctyl ammonium chloride), extraction with Cyanex 301 (bis(2,4,4-trimethylpentyl) dithiophosphinic acid) led to selective extraction of Cu(II) over other metal ions. Employing ion exchange with TEVA-SCN resin can completely separate Co(II) over Mn(II). After adjusting the pH of Co(II) free raffinate to 3, Mn(II) was quantitatively extracted by the mixture of Alamine 336 (mixture of tri-octyl/decyl amine) and PC 88A (2-ethylhexyl hydrogen-2-ethylhexylphosphonate) with two stage cross-current extraction. The synthesized ionic liquid (ALi-CY) was used for complete extraction of Ni(II), whereas Li(I) remained in final raffinate. The metal ions in the loaded organic phase were completely stripped with the proper agents (5% aqua regia for Cu(II), 5% $NH_3$ for Co(II), weak $H_2SO_4$ solution for Mn(II) and Ni(II) stripping, respectively). The experimental results revealed that purity of the metal ions in stripping solution was higher than 99.9%. A flowsheet was suggested to separate metal ions from the HCl leaching solutions of spent LIBs.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 4; 1-17
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of Co(II), Cu(II), Ni(II) and Mn(II) from synthetic hydrochloric acid leaching solution of spent lithium ion batteries by solvent extraction
Autorzy:
Nguyen, Viet Nhan Hoa
Lee, Man Seung
Powiązania:
https://bibliotekanauki.pl/articles/1449331.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
spent lithium-ion batteries
divalent metal ions
solvent extraction
separation
Opis:
Spent lithium ion batteries contain valuable critical metals such as cobalt, copper, lithium and nickel. In order to develop a process for the separation of the divalent metal ions from spent lithium ion batteries, solvent extraction experiments were performed by employing synthetic hydrochloric acid leaching solution. The synthetic solution contained Cu(II), Co(II), Mn(II) and Ni(II) and its acidity was 3 M HCl. Extraction with Aliquat 336 led to selective extraction of Cu(II) with a small amount of Co(II). After adding NaCl to the Cu(II) free raffinate to enhance the complex formation of Co(II), Co(II) was selectively extracted into Aliquat 336 together with Mn(II). The small amount of Mn(II) in the loaded Aliquat 336 was scrubbed by pure Co(II) solution. After adjusting the pH of the raffinate to 3, 91,3% of Mn(II) was selectively extracted over Ni(II) by the mixture of D2EHPA and Alamine 336. In this extraction, the mole fraction of D2EHPA in the mixture affected the extraction of Mn(II). McCabe-Thiele diagrams for the extraction of Cu(II) and Co(II) were constructed. Batch simulation experiments for the three stage counter-current extraction verified the selective extraction of the target metal ions in each extraction step. Namely, the total extraction percentage of Cu(II) and Co(II) was 71.6% and 98.8% respectively. Most metals in the loaded organic phase were stripped completely with the appropriate agents (1.0 M $H_2SO_4$ for Cu(II), 0.1 M H2SO4 for Co(II) and 0.3 M $HCl$ for Mn(II) stripping). A process was proposed to separate the metal ions by solvent extraction.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 4; 599-610
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Vanadium(IV)-Oxy Acetylacetonate and Vanadium(III) Acetylacetonatel on the DPPC Liposome Membranes: EPR Studies
Autorzy:
Man, D.
Mrówka, I.
Wójcik, A.
Pytel, B.
Powiązania:
https://bibliotekanauki.pl/articles/1032414.pdf
Data publikacji:
2017-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.16.Dg
87.64.kh
87.80.Lg
Opis:
The effect of vanadium (IV)-oxy acetylacetonate (V4) and vanadium(III) acetylacetonate (V3) on the liposome membranes formed of synthetic lecithin (DPPC) was presented in this paper. Liposomes were formed during the sonication of DPPC lecithin in an aqueous medium. The concentration of the vanadium compounds changed in the range of 0% to 2.4% in molar ratio to the lecithin. The EPR technique made use of three spin probes penetrating the different areas of the membrane (as follows: TEMPO, 16-DOXYL stearic acid methyl ester, stearic acid 5-DOXYL methyl ester). TEMPO probe penetrates the interphase water-lipid (partition parameter F), the probe 16-DOXYL locates in the middle of the lipid bilayer (rotational correlation time τ), the probe 5-DOXYL gives a picture of membrane fluidity (the order parameter) just below the polar head groups. The results of our research showed the following conclusions. The change of membrane fluidity, as a function of admixture concentration, was dependent on the type of additives. TEMPO probe recorded an increase in liquidity interphase water-lipid for both admixtures: V3 and V4. 16-DOXYL probe indicated that the admixture V3 increases the fluidity in the center of the lipid bilayer. Admixture V4 significantly less impacted on the change of the membrane middle. The 5-DOXYL probe did not influence on the membrane surface portion, there were not observed significant changes under the impact of admixtures. V3 showed stronger impact on membrane fluidity.
Źródło:
Acta Physica Polonica A; 2017, 132, 1; 52-56
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Empathy: A Double Edged Sword
Autorzy:
Cheung-Blundena, Violet
Yoke Moke, Man
Ramanan, Pranita
Powiązania:
https://bibliotekanauki.pl/articles/2049007.pdf
Data publikacji:
2014-10-31
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
empathy
ethnocultural empathy
ingroup and outgroup
aggression
war
peace
Opis:
In the domain of interpersonal relations empathy has been widely regarded as a valuable tool for peacebuilding. Past research has shown that if enough empathy is extended to a victim of violence, insight into the victim’s plight tends to give pause to the aggressor and also prompt bystanders to help. While the victim is the sole recipient of empathy in an interpersonal conflict, elevating the concept of empathy from an individual level analysis to a group level analysis encounters further complications. In intergroup conflicts, both parties in the conflict stand to receive empathy. In light of this, one theoretical question is whether both kinds of empathy, those directed to the ingroup members and the outgroup members, have similar utilities in peacebuilding. We reference the literature on intergroup contact and intergroup threats, to scrutinize the role of empathy in intergroup conflicts. We argue that ingroup and outgroup empathy have the opposite effects on group violence – directing empathy to the outgroup results in the denouncement of aggression, whereas directing empathy to the ingroup may lead to a desire to counterattack. Thus, rather than boosting the overall amplitude of empathy, striking the right balance is the key of leveraging empathy towards peace.
Źródło:
Kultura i Edukacja; 2014, 5(105); 193-210
1230-266X
Pojawia się w:
Kultura i Edukacja
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of SiC Coating of Carbon Fiber on Mechanical Properties in Short Carbon Fiber Reinforced Al Matrix Composite
Autorzy:
Jang, Jin Man
Ko, Se-Hyun
Lee, Wonsik
Powiązania:
https://bibliotekanauki.pl/articles/2049151.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
short carbon fiber
Al composite
SiC coating
mechanical property
Opis:
A356 Al composites reinforced by short carbon fiber were prepared through the 2-step process: fabrication of a composite precursor and ultrasonication of the precursor melt. The short carbon fibers were coated with 0.15~1.5 μm thick SiC layer by a car-bothermal reaction, and an amount of the carbon fiber reinforcement was determined to be 1.5 vol.% and 4.0 vol.%, respectively. The addition of the carbon fiber increased the hardness of A356 alloy. However, tensile strength did not increase in the as-cast composites regardless of the SiC coating and volume fraction of the carbon fiber, due to the debonding which reduced load transfer efficiency from matrix to fiber at the interface. After T6-treatment of the composites, a significant increase in strength occurred only in the composite reinforced by the SiC-coated short carbon fiber, which was considered to result from the formation of a precipitate improving the Al/SiC interfacial strength.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 941-946
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Grain Boundary Structures on Mechanical Properties in Nanocrystalline Al Alloy
Autorzy:
Jang, Jin Man
Lee, Wonsik
Ko, Se-Hyun
Powiązania:
https://bibliotekanauki.pl/articles/2049173.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanocrystalline Al alloy
Young’s modulus
hardness
nanoindentation
low and high angle grain boundary
Opis:
This study investigates the effects of grain boundary structures on mechanical properties of nanocrystalline Al-0.7Mg-1.0Cu alloy using nanoindentation system. Grain boundary structure transforms to high angle grain boundaries from low angle ones with increase of heat treatment temperature and the transformation temperature is about 400°C. Young’s modulus and hardness are higher in sample with low angle grain boundaries, while creep length is larger in sample with high angle ones. These results indicate that progress of plastic deformation at room temperature is more difficult in sample with low angle ones. During compression test at 200°C, strain softening occurs in all samples. However, yield strength in sample with low angle grain boundaries is higher twice than that with high angle ones due to higher activation energy for grain boundary sliding.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 971-975
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the topological dimension of the solutions sets for some classes of operator and differential inclusions
Autorzy:
Bader, Ralf
Gel'man, Boris
Kamenskii, Mikhail
Obukhovskii, Valeri
Powiązania:
https://bibliotekanauki.pl/articles/729534.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
solutions set
fixed points set
topological dimension
multivalued map
condensing map
topological degree
differential inclusion
periodic problem
Opis:
In the present paper, we give the lower estimation for the topological dimension of the fixed points set of a condensing continuous multimap in a Banach space. The abstract result is applied to the fixed point set of the multioperator of the form $ = S _F$ where $_F$ is the superposition multioperator generated by the Carathéodory type multifunction F and S is the shift of a linear injective operator. We present sufficient conditions under which this set has the infinite topological dimension. In the last section of the paper, we consider the applications of the solutions sets for Cauchy and periodic problems for semilinear differential inclusions in a Banach space.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2002, 22, 1; 17-32
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental structure of discourse: mapping the discourse formations of Bauhaus ideals
Autorzy:
Lam, Ka-man
Gorle, Jyotsna
Wilde, Michael
Saad, Patrick
Powiązania:
https://bibliotekanauki.pl/articles/1403665.pdf
Data publikacji:
2020
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
epistemology
digital humanities
graph algorithms
spatial interface
map-territory relation
software studies
media architecture
Opis:
In the relativistic world of the 21st century, if the Bauhaus would still be upheld as doctrine, we must face the truth: it can hardly be considered a provocation. Rather, we most often find ourselves caught between contradictory wishes to preserve an intact past and to make sense of a resolute avant-gardism. This paper proposes that the Bauhaus, as a discursive knowledge body, be structuralistically analyzed with Foucauldian Discourse Analysis. Our claim is substantiated by: first, that a F oucaultian concept of discourse offers an alternative to the practice of history and theory; second, that the publication of Bauhaus reveals a discursive structure in a F oucaultian sense; third, that discourse-analysis-search-engine can perform the analysis on the Bauhaus corpus, contributing to emergent epistemological positions; fourth, that this revealed structure of discourse could be mapped and re-materialized to invite interferences on today’s territory of Bauhaus Discourse. The research and development process in the accompanying project “Bauhaus Orbits – scenographic apparatus for discourse analysis” (bauhausorbits.de) will be discussed.
Źródło:
Architecturae et Artibus; 2020, 12, 1; 15-28
2080-9638
Pojawia się w:
Architecturae et Artibus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
Autorzy:
Lee, Hyun-Ho
Yoon, Kyung-Taek
Choi, Young-Man
Powiązania:
https://bibliotekanauki.pl/articles/1849107.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
checkweigher
magnetic spring
electromagnetic force compensation
Opis:
A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 465-478
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Master Curve Model for Characterization of Decomposition and Densification Behavior of PbAlNbO3-PbZrTiO3 Ceramics
Autorzy:
Han, Jun Sae
Park, Jae Man
Park, Seong Jin
Powiązania:
https://bibliotekanauki.pl/articles/355280.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
master debinding curve
master sintering curve
PAN-PZT
powder injection molding
dilatometer
Opis:
In this study, decomposition and densification behavior of PbAlNbO3-PbZrTiO3 (PAN-PZT) ceramics were characterized for powder injection molding process. Thermal gravity analysis and in-situ dilatometer experiment were carried out to construct master curve. Based on master curve model approach, one-combined master debinding curve (MDC) and master sintering curve (MSC) were constructed for piezoelectric PAN-PZT ceramics. Derived curves matched well with the experimental data. Process optimization and material development will be conducted based on characterization of master curve parameters.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1099-1103
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolution of primary and secondary education in Romania in terms of EU integration
Ewolucja szkolnictwa podstawowego i średniego w Rumunii w zakresie integracji UE
Autorzy:
Dima, I. C.
Ciurea, V.
Grabara, I.
Man, M.
Powiązania:
https://bibliotekanauki.pl/articles/406216.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
ewolucja
edukacja
integracja z UE
evolution
education
EU integration
Opis:
Evolution of preuniversity educational institution - taking into account the preuniversity educational institution in developing the human society, the following stages are distinguished in its development since its appearance until now and namely. The educational institution - basic unit of the national system of preuniversity education. The definition of the preuniversity educational institution as basic unit of the national system of the preuniversity education takes into account the social function of the preuniversity educational institution in relation to the structures which it can define in time and space.
Ewolucja przed-uniwersyteckich instytucji edukacyjnych, biorąc pod uwagę instytucje odkrywające społeczeństwo ludzkie, różnią się następujące etapy w rozwoju, ponieważ jego wygląd do tej pory, a mianowicie, instytucja edukacyjna - podstawowa jednostka krajowego systemu edukacji. Definicja przed-uniwersyteckiej instytucji edukacyjnej jako podstawowej jednostki krajowego systemu edukacji, uwzględnia społeczną funkcję tych instytucji edukacyjnych w odniesieniu do struktur, które można określić w czasie i przestrzeni.
Źródło:
Polish Journal of Management Studies; 2011, 3; 89-98
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the influence of financial factors on corporate social responsibility: evidence from Romania
Analiza wpływu czynników finansowych na społeczną odpowiedzialność biznesu: dowody z Rumunii
Autorzy:
Man, Mariana
Păunescu, Carmen Florentina
Bogeanu-Popa, Maria-Mădălina
Powiązania:
https://bibliotekanauki.pl/articles/2147294.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska
Tematy:
CSR
czynniki finansowe
wielkość podmiotu gospodarczego
rentowność
płynność
financial factors
size of economic entity
profitability
liquidity
Opis:
The novelty element of this paper is given by the Corporate Social Responsibility (CSR) connected with the three financial factors: the economic entity’s dimension, the rentability and the liquidity of the companies listed on Bucharest Stock Exchange (BSE). The sample consists of 83 companies listed on BSE on the regulated market during the year 2020. The data collected was processed using qualitative and quantitative research. A series of econometric models were used to analyze the data and determine the results, such as descriptive statistics, the Jarque-Bera test (J-B), the correlation between independent variables, the coefficient of determination, the F test and the T-test. The research results have shown that the size of the economic entity and profitability have had a significant influence on CSR elements, as demonstrated by the significance coefficient registered for the two independent variables. The testing of the issued hypotheses was through multiple regressions and significance coefficient (p-value). According to which the size of the economic entity and profitability influence the social responsibility of the companies listed on BSE, the hypotheses are validated, registering high correlations and, thus, significantly influencing CSR.
Nowatorski element niniejszego opracowania stanowi Społeczna Odpowiedzialność Biznesu (CSR) związana z trzema czynnikami finansowymi: wymiarem podmiotu gospodarczego, rentownością i płynnością spółek notowanych na Giełdzie Papierów Wartościowych w Bukareszcie (BSE). Próba składa się z 83 spółek notowanych na BSE na rynku regulowanym w 2020 roku. Zebrane dane zostały przetworzone w ramach badań jakościowych i ilościowych. Do analizy danych i określenia wyników wykorzystano szereg modeli ekonometrycznych, takich jak statystyka opisowa, test Jarque-Bera (J-B), korelacja między zmiennymi niezależnymi, współczynnik determinacji, test F i T-test. Wyniki badań wykazały, że wielkość podmiotu gospodarczego i rentowność miały istotny wpływ na elementy CSR, o czym świadczy współczynnik istotności zarejestrowany dla dwóch zmiennych niezależnych. Testowanie stawianych hipotez odbywało się za pomocą regresji wielokrotnych i współczynnika istotności (wartość p). Zgodnie z tym, że wielkość podmiotu gospodarczego i rentowność wpływają na społeczną odpowiedzialność spółek notowanych na BSE, hipotezy są walidowane, rejestrując wysokie korelacje, a tym samym znacząco wpływając na CSR.
Źródło:
Polish Journal of Management Studies; 2021, 24, 1; 202--219
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expert systems used in industrial production management
Systemy eksperckie wykorzystywane w zarządzaniu produkcją przemysłową
Autorzy:
Dima, I. C.
Man, M.
Grabara, I.
Ciurea, V.
Powiązania:
https://bibliotekanauki.pl/articles/405839.pdf
Data publikacji:
2010
Wydawca:
Politechnika Częstochowska
Tematy:
system ekspercki
sztuczna inteligencja
interfejs
wyszukiwarka
wdrażanie systemu eksperckiego
expert system
artificial intelligence
interface
search engine
implementation of expert system
Opis:
In the conditions of computing the human society, the operational management activities can be improved by using artificial intelligence. Therefore, an expert system is proposed, for the metallurgical industry, for the casting activity for parts necessary in mining industry.
Sztuczna inteligencja może przyczynić się do poprawy działań związanych z zarządzaniem operacyjnym w przypadku informatyzacji społeczeństwa. W związku z powyższym, w artykule zaproponowano wykorzystanie systemu eksperckiego w przemyśle metalurgicznym, szczególnie w procesach odlewania części niezbędnych w przemyśle kopalnianym.
Źródło:
Polish Journal of Management Studies; 2010, 2; 57-67
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The cost for the entire life cycle of the product respecting quality standards
Autorzy:
Man, M.
Modrak, V.
Dima, I. C.
Pachura, P.
Powiązania:
https://bibliotekanauki.pl/articles/406128.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
cykl życia produktu
standardy jakości
optymalizacja
life cycle of product
quality standards
optimization
Opis:
This article presents issues concerning life cycle of products. Taking into account the limitation of the life cycle of products and strategic investments that require the use of certain technologies, the decision of setting forth a new product on the market should rely upon the costs of its life cycle.
Artykuł prezentuje kwestie dotyczące cyklu życia produktów. Biorąc pod uwagę ograniczenia cyklu życia produktów oraz inwestycje strategiczne, które wymagają wykorzystania określonych technologii, decyzja o wdrożeniu nowego produktu na rynek powinna opierać się na kosztach ich cyklu życia.
Źródło:
Polish Journal of Management Studies; 2011, 4; 15-22
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
Autorzy:
Lee, Hyun-Ho
Yoon, Kyung-Taek
Choi, Young-Man
Powiązania:
https://bibliotekanauki.pl/articles/1849003.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
checkweigher
magnetic spring
electromagnetic force compensation
Opis:
A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 465-478
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Checkweigher using an EMFC weighing cell with magnetic springs and air-bearings
Autorzy:
Lee, Hyun-Ho
Yoon, Kyung-Taek
Choi, Young-Man
Powiązania:
https://bibliotekanauki.pl/articles/1849051.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
checkweigher
magnetic spring
electromagnetic force compensation
Opis:
A dynamic weighing system or a checkweigher is an automated inspection system that measures the weight of objects while transferring them between processes. In our previous study, we developed a new electromagnetic force compensation (EMFC) weighing cell using magnetic springs and air bearings. This weighing cell is free from flexure hinges which are vulnerable to shock and fatigue and also eliminates the resonance characteristics and implements a very low stiffness of only a few N/m due to the nature of the Halbach array magnetic spring. In this study, we implemented a checkweigher with the weighing cell including a loading and unloading conveyor to evaluate its dynamic weighing performances. The magnetic springs are optimized and re-designed to compensate for the weight of a weighing conveyor on the weighing cell. The checkweigher has a weighing repeatability of 23 mg (1σ) in static situation. Since there is no low-frequency resonance in our checkweigher that influences the dynamic weighing signal, we could measure the weight by using only a notch filter at high conveyor speeds. To determine the effective measurement time, a dynamic weighing process model is used. Finally, the proposed checkweigher meets Class XIII of OIML R51-1 of verification scale e 0.5 g at a conveyor speed of up to 2.7 m/s.
Źródło:
Metrology and Measurement Systems; 2021, 28, 3; 465-478
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Econometric patterns and methods used for analysis of technological innovations in workshops and production departments equipped with flexible manufacturing systems
Metody oraz modele ekonometryczne wykorzystywane do analizy innowacji technologicznych w wytwórniach i działach produkcyjnych wyposażonych w elastyczne systemy produkcyjne
Autorzy:
Dima, I. C.
Man, M.
Nowicka-Skowron, M.
Grabara, I.
Powiązania:
https://bibliotekanauki.pl/articles/406206.pdf
Data publikacji:
2011
Wydawca:
Politechnika Częstochowska
Tematy:
analiza
warsztaty
model ekonometryczny
elastyczny system produkcyjny
analysis
workshops
econometric patterns
flexible manufacturing system
Opis:
Pursuant to the analysis of the assessment method of the structures of the production process, in the construction of machines, we find that, due to the requirements of diversification of assortments and features of products, criteria of the quality level and work productivity, the reduction of fabrication costs, the structure of the production process develops continuously. Starting from workshops specialized on technological procedures, the structure developed onto production lines in a sole object flow, then onto production lines in a multi-object flow, and, currently, onto flexible production forms. To this purpose, flexible fabrication cells develop. The latter form develops continuously, but especially after the accomplishment of machine-tools with number command. Thus, we pass from production structures in automatic rigid flow lines, efficient for mass and widerange production, to flexible structures, especially efficient in low and medium-range production.
Na podstawie analizy metod oceny struktury procesu produkcyjnego, w konstrukcji maszyn, okazuje się, że ze względu na wymogi dywersyfikacji asortymentu i cechy produktów, kryteria poziomu jakości i wydajności pracy, obniżenie kosztów produkcji, struktura procesu produkcji rozwija się w sposób ciągły. Począwszy od wytwórni wyspecjalizowanych w procedurach technologicznych, z rozwiniętą strukturą na liniach produkcyjnych w przepływie pojedynczego obiektu do linii produkcyjnych z przepływem wielu obiektów, a obecnie do elastycznych form produkcji. W tym celu rozwijają się komórki elastycznego wytwarzania. Ostatnia forma rozwija się w sposób ciągły, zwłaszcza po wykonaniu obrabiarek z poleceniem numerycznym. W ten sposób przechodzimy od struktury produkcji w automatycznych sztywnych liniach przepływu, wydajnych dla masowej i szerokiej zakresowo produkcji, do struktur elastycznych, szczególnie skutecznych w produkcji niskiego i średniego zasięgu.
Źródło:
Polish Journal of Management Studies; 2011, 3; 7-31
2081-7452
Pojawia się w:
Polish Journal of Management Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication, Structural Characterization and Optical Properties of the Flower-Like ZnO Nanowires
Autorzy:
Feng, L.
Liu, A.
Ma, Y.
Liu, M.
Man, B.
Powiązania:
https://bibliotekanauki.pl/articles/1538755.pdf
Data publikacji:
2010-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Bc
81.05.Dz
81.10.Aj
Opis:
Multipod flower-like zinc oxide (ZnO) nanowires have been successfully synthesized on Si(111) substrates using a pulsed laser deposition prepared Zn film as "self-catalyst" by the simple thermal evaporation oxidation of the metallic zinc powder at 850°C without any other catalysts or additives. The pre-deposited Zn films by pulsed laser deposition on the substrates can promote the formation of the ZnO nuclei effectively. Also it can further advance the growth of the flower-like ZnO nanowires accordingly. X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscopy, Fourier transform infrared spectrum, and photoluminescence were used to analyze the structure, morphology, composition and optical properties of the as-synthesized products. The results demonstrate that the nanowires were single crystalline with hexagonal wurzite structure, grown along the [0001] in the c-axis direction. Room temperature photoluminescence spectrum of the ZnO nanowires shows a nearband-edge ultraviolet emission (peak at ≈ 384 nm) and a deep-level green emission (peak at ≈ 513 nm). In addition, the growth mechanism of the flower-like ZnO nanowires is discussed in detail.
Źródło:
Acta Physica Polonica A; 2010, 117, 3; 512-517
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Helicobacter pylori cytotoxin-associated gene A impairs the filtration barrier function of podocytes via p38 MAPK signaling pathway
Autorzy:
Yang, Man
Wang, Ling
Gu, Li-jie
Yuan, Wei-jie
Powiązania:
https://bibliotekanauki.pl/articles/1038590.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
CagA
ZO-1
p38 MAPK
podocyte
proteinuria
Opis:
Helicobacter pylori (Hp) specific antigens were found deposited in the glomeruli in some kidney diseases. However, the underlying molecular mechanisms remain to be elucidated. The aim of this study was to investigate the effect of cytotoxin associated gene A protein (CagA), a key virulence factor of Hp, on mouse podocytes. Cells were cultured and treated with recombinant CagA protein. The expression of the tight junction protein ZO-1 and p38 MAPK signaling pathway activation were measured with real-time RT-PCR and western blotting. The filtration barrier function of podocytes was evaluated with albumin influx assay. CagA decreased the expression and membrane distribution of ZO-1, impaired the filtration barrier function of podocytes, while activating p38 MAPK signaling pathway in these cells. Selective p38 MAPK inhibition partly prevented CagA-induced filtration barrier dysfunction of podocytes through ameliorating ZO-1 downregulation. Taken together, the results suggested that CagA, at least via p38 MAPK signaling pathway, may induce podocyte injury. Anti-Hp therapy may be beneficial for the treatment of kidney diseases related to Hp antigen deposition.
Źródło:
Acta Biochimica Polonica; 2017, 64, 3; 471-475
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected amino acids on the dynamic properties of the liposome membranes : ESR study
Autorzy:
Man, D.
Broda, M.
Buczek, A.
Kawecka, A.
Siodłak, D.
Powiązania:
https://bibliotekanauki.pl/articles/146690.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EYL liposomes
electron spin resonance (ESR) method
N-methylation
amino acids
peptides
Opis:
In this work the changes in the fluidity of liposome membranes caused by alanine and butyrine derivatives (Ac-Ala-NMe2 and Ac-Abu-NMe2) were investigated. Liposomes were obtained in the process of egg yolk lecithin (EYL) sonication. The concentration of the admixture in the proportion to EYL varied from 0 to 25% mole. The electron spin resonance (ESR) spectroscopy was used with two different spins probes. Each spin probe penetrates different regions of liposome membrane. The TEMPO probe occurs both in the hydrophobic part of the membrane and in the water environment what allows to determine the spectroscopic parameter F of division of this probe into the membrane and its water surrounding. DOXYL is localized in the central part of the lipid bilayer and is used to obtain the spectroscopic parameter τ – rotation correlation time – whose value gives information about fluidity changes in the middle of the lipid bilayer. The study indicated that the tested as admixtures N-methylated model peptides significantly changed the fluidity of liposome membranes. The dynamic of this process depends both on amino acids derivative and on the membrane region. Both studied compounds increased the fluidity of the surface layer of liposome membrane. At the same time, butyrine derivative caused the stiffening of the middle part of liposome bilayer, but alanine derivative slightly increased the fluidity of this region.
Źródło:
Nukleonika; 2013, 58, 3; 443-446
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of humic acids on EYL liposome membranes : ESR method
Autorzy:
Pytel, B.
Filipiak, A.
Pisarek, I.
Olchawa, R.
Man, D.
Powiązania:
https://bibliotekanauki.pl/articles/146924.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
EYL liposomes
ESR method
humic substances
Opis:
In this paper, the effects of model (commercial) and natural (extracted from peat) humic substances on the membrane of liposomes formed with egg yolk lecithin (EYL) are presented. In our research, mass concentrations of fulvic and humic acids were used, which in relation to lecithin varied from 0% to 13%. To study membrane fluidity, electron spin resonance (EPR) was used with two spin probes, penetrating various regions of the lipid bilayer. The effects of model and natural humic substances (humic acids – HAs and fulvic acids – FAs) on the lipid membrane in different regions were researched: the lipid-water interphase, and in the middle of the lipid bilayer. It was shown that FA and HA impact the fluidity of liposome membranes in different ways. Increased mass concentrations of HAs decreased membrane fluidity in both acids: extracted from peat and the model. However, increased mass concentration of FAs extracted from peat, decreased membrane fluidity in the surface region, at the same time stiffening the central part of the bilayer. Increasing the concentration of FAs extracted from peat had the opposite effect when compared to model FA. This effect may be related to the complexation of xenobiotics present in the soil environment and their impact on biological membranes.
Źródło:
Nukleonika; 2015, 60, No. 3, part 1; 455-459
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Deashing and desulphurization of fine oxidized coal by falcon concentrator and flotation
Autorzy:
Zhu, X.
Tao, Y.
Sun, Q.
Man, Z.
Xian, Y.
Powiązania:
https://bibliotekanauki.pl/articles/951856.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
fine oxidized coal
desulphurization
deashing
flotation
enhanced gravity separation
Opis:
Flotation and enhanced gravity separation based on different separation principles were carried out to investigate the desulphurization and deashing efficiency of fine oxidized coal. Surface properties of fresh and oxidized coals were tested by XPS and results showed that the contents of hydrophobic functional groups decreased while the content of hydrophilic functional groups increased after oxidization. Floatability and density analysis results showed that the floatability of coal samples decreased sharply because of oxidation, however, density composition of coal sample only had slight changes. Separation results showed that yields of gravity concentrates outclassed that of flotation concentrates, meanwhile, ash contents and sulfur contents of gravity concentrates were far lower than that of flotation concentrates. Yields and ash contents increased with the collector dosage and achieved to be 17.83 and 26.94% respectively when the collector dosage was 1600 g•Mg-1. Yields and ash contents of gravity concentrates decreased with the centrifugal force and increased with the recoil water flow with similar sulfur content. Clean coal with yield of 53.86%, ash content of 9.81%, sulfur content of 1.47% and with a corresponding desulphurization efficiency of 44.53% was achieved at centrifugal force of 107 g and recoil water flow of 13.3 dm3•min-1. For fine oxidized coal, enhanced gravity separation has a significant advantage of the separation efficiency compared with flotation.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 634-646
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Drilling Machinability of γ-TiAl Alloy
Autorzy:
Yang, Hyunseok
Jung, Woo-Chul
Kong, Man-Sik
Lee, Changhee
Powiązania:
https://bibliotekanauki.pl/articles/2049153.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
γ-TiAl alloy
drilling
machinability
thrust
torque
Opis:
Intermetallic γ-TiAl alloy has excellent properties at high temperatures and is thus attracting attention as a substitute for nickel-based superalloy parts for turbine engines. However, γ-TiAl alloy is reported to be a difficult material to be machined due to its low ductility at room temperature, tensile strength, and thermal conductivity. in this study, a system capable of measuring thrust force (Tf) and torque (Tc) during the drilling process was constructed, and drilling processability according to the heat treated microstructure of γ-TiAl alloy was compared. As a result, it was confirmed that the thrust and torque of the γ-TiAl alloy having a microstructure in which the grains were refined by the heat treatment process was relatively low and rapidly stabilized, which is advantageous for drilling.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 951-954
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Drilling Machinability of γ-TiAl Alloy
Autorzy:
Yang, Hyunseok
Jung, Woo-Chul
Kong, Man-Sik
Lee, Changhee
Powiązania:
https://bibliotekanauki.pl/articles/2049167.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
γ-TiAl alloy
drilling
machinability
thrust
torque
Opis:
Intermetallic γ-TiAl alloy has excellent properties at high temperatures and is thus attracting attention as a substitute for nickel-based superalloy parts for turbine engines. However, γ-TiAl alloy is reported to be a difficult material to be machined due to its low ductility at room temperature, tensile strength, and thermal conductivity. in this study, a system capable of measuring thrust force (Tf) and torque (Tc) during the drilling process was constructed, and drilling processability according to the heat treated microstructure of γ-TiAl alloy was compared. As a result, it was confirmed that the thrust and torque of the γ-TiAl alloy having a microstructure in which the grains were refined by the heat treatment process was relatively low and rapidly stabilized, which is advantageous for drilling.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 951-954
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of primary musculocutaneous Hodgkin’s lymphoma with the aid of 18F FDG PET/CT – a rare entity
Autorzy:
Kakkar, Lavish
Singh, Man Mohan
Deswal, Satyawati
Thakur, Priyamedha Bose
Powiązania:
https://bibliotekanauki.pl/articles/40614539.pdf
Data publikacji:
2024-06-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
cutaneous lymphoma
muscular lymphoma
musculocutaneous Hodgkin’s lymphoma
refractory
Opis:
Introduction and aim. Primary musculocutaneous lymphoma is extremely rare and associated with poor prognosis. Here, we present a case of refractory primary muscular lymphoma with overlying cutaneous involvement with the aid of 18F-Fluorodeoxyglucose positron emission tomography/computed tomography (18F FDG PET/CT) for staging and treatment. Description of the case. We present the case of a 52-year-old man presented with musculocutaneous Hodgkin’s lymphoma having swelling and discolored areas over the left leg and right arm associated with itchiness. Upon examination, there was scaling, erythema over the body with Gottron’s papules on knuckles and heliotrope rash. Skin and muscle biopsy were suggestive of Hodgkin’s lymphoma. This patient was had primary musculocutaneous lymphoma. His diagnosis was delayed. PET/CT was performed for staging and response to treatment, which was suggestive of refractory disease. Conclusion. PET/CT plays a vital role in diagnosis, staging, response to therapy and helps in optimized treatment for these specific patients.
Źródło:
European Journal of Clinical and Experimental Medicine; 2024, 22, 2; 452-456
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Flux on the Recovery Behavior of Valuable Metals during the Melting Process of Aluminum Can Scrap
Autorzy:
Han, Chulwoong
Kim, Yong Hwan
Kim, Dae-Geun
Lee, Man Seung
Powiązania:
https://bibliotekanauki.pl/articles/2048886.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum
can scrap
flux
gas bubbling filtration
GBF
recycling
Opis:
This study investigated the effect of flux type and amounts on recovery behavior of aluminum alloy during the melting process of Al can scrap. The heat treatment was conducted to remove the coating layer on the surface of can scrap at 500°C for 30 min. The molten metal treatment of the scrap was performed at 750°C in a high-frequency induction furnace with different flux types and amounts. It was observed that the optimum condition for recovery of Al alloy was to add about 3 wt.% flux with a salt and MgCl2 mixing ratio of 70:30 during melting process. The mechanical properties of recovered Al alloy were about 254.8 mPa, which is similar to that of the virgin Al5083 alloy.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 1023-1027
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent extraction of Terbium(III) from chloride solution using organophosphorus extractant, its mixture and ionic liquid in the presence of organic acids
Autorzy:
Tran, Thanh Tuan
Song, Si Jeong
Oh, Chang Geun
Lee, Man Seung
Powiązania:
https://bibliotekanauki.pl/articles/24085863.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
extraction
Terbium(III)
organic acid
ionic liquid
buffer effect
Opis:
Addition of organic acids to dilute hydrochloric acid solution can improve the extraction of rare earth elements by single cationic extractants. However, the correlation between the chemical structure of organic acids and the extraction of REEs as well as the variation in equilibrium pH has not been elucidated. In this study, we investigated the extraction of Tb(III) from dilute HCl solutions containing an organic acid like formic, lactic, fumaric, or maleic acid. As extractants, single Cyanex 272, a mixture of Cyanex 272 and Alamine 336 (Ala336-Cy272), and an ionic liquid (ALi-Cy272) synthesized by Cyanex 272 and Aliquat 336 were used. The speciation of Tb(III) in dilute HCl solutions containing organic acids was analyzed. In extraction of Tb(III), organic acids showed two roles as complexing and buffering agent, which depended on the chemical structure of the acids. There was some difference in the extraction of Tb(III) between single Cyanex 272 and ionic liquid, ALi-Cy272. During extraction with ALi-Cy272, formic and lactic acid negatively affected the extraction of Tb(III). The fact that the chemical structure of organic acids affected the extraction of Tb(III) from dilute HCl solution by the studied extractants can provide important information on the selection of suitable extraction systems.
Źródło:
Physicochemical Problems of Mineral Processing; 2023, 59, 2; art. no. 162714
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bivariate distribution characteristics of spatial structure in five different Pinus massoniana forests
Autorzy:
Zhang, Ren-bo
Ding, Gui-jie
Luo, Xiao-man
Chen, Mo-fang
Powiązania:
https://bibliotekanauki.pl/articles/956829.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:
uniform angle index
mingling
dominance
structure-based forest management
Opis:
Bivariate distribution is an effective approach to spatial structure analysis. Combined with two of the three structure parameters (uniform angle index (W), dominance (U) and mingling (M)), the structural bivariate characteristics of five different Pinus massoniana forests were explored in this study. Our objective was to provide a theoretical direction for structure-based and detailed management in P. massoniana forests. The bivariate traits showed that mixed artificial or secondary forests predominated by P. massoniana trees do not typically achieve the highest mingling level. Trees under extreme mingling conditions were rare and typically comprised of non-dominant species instead of dominant ones in P. massoniana forests; these trees were generally overtopped and randomly distributed. Management implications can be extracted comparing the bivariate traits between all species and dominant species. The original community structure, development stage, and mixed-tree species number affect the univariate M and, furthermore, the two bivariate U-M and W-M distributions in mixed forests. Forest type has little effect on all-species W-U traits compared to those of the dominant species. U-M traits should be adjusted first if the random frequency values are highest in W-U and W-M bivariate distribution, and it is necessary to determine whether these two bivariate traits shade the W univariate. Adjustments made based on bivariate distribution can reveal poor frequency combinations for foresters to target; this allows the simultaneous adjustment of dual aspects of forest structure based on one bivariate index. Our results show that bivariate distribution may provide very useful information for the management of P. massoniana and other forests.
Źródło:
Dendrobiology; 2017, 78; 75-84
1641-1307
Pojawia się w:
Dendrobiology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Temperature Random Stack Creep Property of Ni-Cr-Al based Powder Porous Metal Manufactured with Powder Sintering Process
Autorzy:
Kang, Tae-Hoon
Kim, Kyu-Sik
Park, Man-Ho
Lee, Kee-Ahn
Powiązania:
https://bibliotekanauki.pl/articles/353154.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
powder porous metal
high-temperature
compression test
creep property
Opis:
Recently, attempts have been made to use porous metal as catalysts in a reactor for the hydrogen manufacturing process using steam methane reforming (SMR). This study manufactured Ni-Cr-Al based powder porous metal, stacked cubic form porous blocks, and investigated high temperature random stack creep property. To establish an environment similar to the actual situation, a random stack jig with a 1-inch diameter and height of 75 mm was used. The porous metal used for this study had an average pore size of ~1161 μm by rolling direction. The relative density of the powder porous metal was measured as 6.72%. A compression test performed at 1073K identified that the powder porous metal had high temperature (800°C) compressive strength of 0.76 MPa. A 800°C random stack creep test at 0.38 MPa measured a steady-state creep rate of 8.58×10-10 s-1, confirming outstanding high temperature creep properties. Compared to a single cubic powder porous metal with an identical stress ratio, this is a 1,000-times lower (better) steady-state creep rate. Based on the findings above, the reason of difference in creep properties between a single creep test and random stack creep test was discussed.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 513-518
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of High–resolution Reflection Seismic Attributes for Researching 3D Shallow Marine Geology Structures
Zastosowanie atrybutów sejsmicznych odbić o wysokiej rozdzielczości do badania struktur 3D płytkiej geologii morskiej
Autorzy:
Le, Cuong Van Anh
Duong, Man Ba
Nguyen, Thuan Van
Nguyen, Truong Ngoc
Powiązania:
https://bibliotekanauki.pl/articles/2201256.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
high-resolution seismic
textural attribute
bathymetry
color-blend
sejsmika wysokiej rozdzielczości
atrybut tekstury
batymetria
mieszanie kolorów
Opis:
In river sedimentology and bathymetry study, high–resolution seismic approach equipped with a sub–bottom profiler is necessary. Difference of acoustic impedances resulted by varies of sediment stratigraphy layers can be visualized through dynamic seismic vibration. In marine environments, detection of young sediment as sand dunes or mud, mixtures of sand and clay, and clay formations can help policy makers to launch policies or regulations in safety of water transportation as well as civil building infrastructure. We have measured, analyzed, and interpreted an enormous collection of 2D seismic sub-bottom profiles in Can Gio offshore, Ho Chi Minh City, Vietnam for understanding its shallow subsurface young deposits. Our approach is to combine three key seismic textural attributes (i.e., Correlation, Variance, and Homogeneity) in the representation of color-blended attribute for picking distinguished geological features. In our result, 2D seismic horizons representing boundaries of diverse types of sediments can provide a great input for modeling 3D seabed and distribution of sand, sand-clay mixture, and clay sediments within the interest area. The sand layer useful for mining in this area is strongly affected by channels stemming from Soai Rap river.
W badaniach sedymentologicznych i batymetrycznych rzek konieczne jest podejście sejsmiczne o wysokiej rozdzielczości wyposażone w profiler poddenny. Różnicę impedancji akustycznych wynikającą ze zmienności warstw stratygraficznych osadów można zwizualizować za pomocą dynamicznych drgań sejsmicznych. W środowiskach morskich wykrywanie młodych osadów, takich jak wydmy lub błoto, mieszanki piasku i gliny oraz formacje gliny, może pomoc decydentom we wprowadzaniu polityk lub przepisów dotyczących bezpieczeństwa transportu wodnego, a także infrastruktury budynków cywilnych. Zmierzyliśmy, przeanalizowaliśmy i zinterpretowaliśmy ogromny zbiór profili sejsmicznych 2D pod dnem w Can Gio na morzu w mieście Ho Chi Minh w Wietnamie, aby zrozumieć jego płytkie, podpowierzchniowe młode złoża. Nasze podejście polega na połączeniu trzech kluczowych atrybutów tekstury sejsmicznej (tj. Korelacji, Wariancji i Jednorodności) w reprezentacji atrybutu mieszania kolorów w celu wybrania wyróżniających się cech geologicznych. W naszym wyniku, poziomy sejsmiczne 2D reprezentujące granice rożnych typów osadów mogą stanowić doskonały materiał wejściowy do modelowania 3D dna morskiego i rozmieszczenia piasku, mieszanki piaskowo-gliniastej i osadów gliniastych w obszarze zainteresowania. Na warstwę piasku przydatnego do wydobycia na tym obszarze duży wpływ mają kanały wychodzące z rzeki Soai Rap..
Źródło:
Inżynieria Mineralna; 2023, 1; 175--184
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical Studies of High-nitrogen-containing Energetic Compounds Based on the s-Tetrazine Unit
Autorzy:
Man, T. T.
Wang, K.
Zhang, J.G.
Niu, X. Q.
Zhang, T. L.
Powiązania:
https://bibliotekanauki.pl/articles/358527.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
high-energy-density materials (HEDMs)
substituted s-tetrazine
compounds
electronic properties
thermodynamic properties
detonation
properties
Opis:
In order to develop new high-energy-density materials (HEDMs), we have investigated 12 substituted s-tetrazine (TZ) compounds, where s-tetrazine was substituted by amino, amido and related groups. Density functional theory (DFT) was used to predict the optimized geometries, electronic structures, total energy, heats of formation (HOFs) and densities. In addition the detonation properties were evaluated by using the VLW equation of state (EOS). The standard enthalpy of formation, the Gibbs free energy, entropy and equilibrium constants were used to estimate the success of the synthetic substitution reactions, which provided theoretical support for practical work. The bond dissociation energy (BDE) of bond C-R was calculated at each stage of the substitution reaction. The calculated results showed that substitution of amino, amido and their derivatives in the TZ ring enhances the HOF values and is favorable for increasing the thermal stability. The calculated detonation properties indicated that incorporating the above groups into the TZ ring is benefcial for improving the explosive performance. Considering the detonation properties and thermal stability, the 12 derivatives may be regarded as promising candidates as high-energy-density materials (HEDMs).
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 2; 171-189
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Semisolid and Strontium Addition on Dry Sliding Wear Behavior of Hypoeutectic Al-Si Alloy
Autorzy:
Anas, Noraz Man
Zakaria, S. A.
Anasyida, A. S.
Mohamad, Hasmaliza
Dhindaw, Brij Kumar
Powiązania:
https://bibliotekanauki.pl/articles/2203750.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hypoeutectic Al-Si alloy
semisolid
cooling slope
Sr
wear resistance
Opis:
The study aims to investigate the effect of semisolid structure and strontium (Sr) addition on the wear behavior of hypoeutectic Al-Si alloy. Semisolid hypoeutectic Al-Si alloy was prepared using cooling slope casting with addition of 0 to 0.93 wt.% Sr. Microstructural study was done using an optical microscope. Vicker microhardness and pin on disc tribometer were used for microhardness and wear testing. When compared to conventional casting, the microhardness of the semisolid hypoeutectic Al-Si alloy improved by 9.8%. Sr addition at 0.43 wt.% resulted in a refined eutectic structure with a 17% increase in hardness over conventional casting. The globular structure α-Al formed during semisolid casting reduced porosity, and the addition of Sr refined the eutectic silicon into a fine fibrous structure that is tightly bound with the Al matrix. These are the primary factors that contribute to the high wear resistance in modified-Sr semisolid alloys.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 1; 307--317
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Improvement of resistance to plant pathogens and pests by DNA technology.
Autorzy:
Ueng, Peter P.
Hwang, Shaw-Yhi
Yang, Man-Miao
Cui, Kai-Rong
Hsu, Hei-Ti
Powiązania:
https://bibliotekanauki.pl/articles/2198797.pdf
Data publikacji:
2001-12-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Opis:
To improve crop yield, DNA technology has been used to enhance plant resistance toward pathogens and pests. Genes identified through understanding of host-pathogen interactions in viral, bacterial and fungal diseases, the mechanism of hypersensitive reaction in Arabidopsis and insect toxicity of natural peptides are used for their expression in plants. Progress on the use of simple sequence repeats (SSR) markers for resistance gene identification, development of virus-specific antibody gene expression in plants for virus control, construction of genes for multi-pathogen resistance, and use of viral vectors for gene efficiency evaluation are discussed.
Źródło:
Plant Breeding and Seed Science; 2001, 45, supplement; 45-58
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Carbon Content on Austenite Stability and Strain-induced Transformation of Nanocrystalline FeNiC Alloy by Spark Plasma Sintering
Autorzy:
Oh, Seung-Jin
Kim, Byoung-Cheol
Suh, Man-Chul
Shon, In-Jin
Lee, Seok-Jae
Powiązania:
https://bibliotekanauki.pl/articles/355534.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FeNiC alloy
austenite stability
strain-induced transformation
spark plasma sintering
Opis:
The effects of carbon content on the austenite stability and strain-induced transformation of nanocrystalline Fe-11%Ni alloys were investigated using X-ray analysis and mechanical tests. The nanocrystalline FeNiC alloy samples were rapidly fabricated using spark plasma sintering because of the extremely short densification time, which not only helped attain the theoretical density value but also prevented grain growth. The increased austenite stability resulted from nanosized crystallites in the sintered alloys. Increasing compressive deformation increased the volume fraction of strain-induced martensite from austenite decomposition. The kinetics of the strain-induced martensite formation were evaluated using an empirical equation considering the austenite stability factor. As the carbon content increased, the austenite stability was enhanced, contributing to not only a higher volume fraction of austenite after sintering, but also to the suppression of its strain-induced martensite transformation.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 863-867
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review of optimum temperature, humidity, and vapour pressure deficit for microclimate evaluation and control in greenhouse cultivation of tomato: a review
Autorzy:
Shamshiri, R.R.
Jones, J.W.
Thorp, K.R.
Ahmad, D.
Che Man, H.
Taheri, S.
Powiązania:
https://bibliotekanauki.pl/articles/26637.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Źródło:
International Agrophysics; 2018, 32, 2
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Cashew Apple Pomace Powder in Pasta Making: Effects of Powder Ratio on the Product Quality
Autorzy:
Nguyen, Thi Phuong Trang
Tran, Thi Thu Tra
Ton, Nu Minh Nguyet
Le, Van Viet Man
Powiązania:
https://bibliotekanauki.pl/articles/16538534.pdf
Data publikacji:
2023-02-21
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidant capacity
by-product
dietary fiber
pasta
Opis:
The production of cashew apple juice generates fruit pomace which is rich in dietary fiber and phenolic compounds and shows high antioxidant capacity. In this research, the effects of different ratios of cashew apple pomace powder (CAPP) in the pasta formulation on the product quality were investigated. Increase in CAPP level in the pasta recipe from 0 to 20% enhanced the total dietary fiber and total phenolic content of the product by 4.1 times and 11.8 times, respectively, as well as improved the 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity and ferric reducing antioxidant power by 18.2 times and 28.6 times, respectively. Nevertheless, the increased level of CAPP in the pasta recipe resulted in decreased cooking quality, textural properties and overall acceptability of the pasta. Pasta sample with 10% CAPP level in the recipe was considered high-fiber food with acceptable sensory quality. Therefore, CAPP may be considered a promising source of dietary fiber and antioxidants for the development of healthy food products.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2023, 73, 1; 50-58
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Facile Synthesis and Characterization of Novel CdS/BiOI Heterojunctions with Enhanced Visible-Light Photocatalytic Performances
Autorzy:
Fang, Shanshan
Lu, Min
Zhou, Man
Li, Zhongyu
Xu, Song
Peng, Yanyan
Li, Qinchi
Lu, Dayong
Powiązania:
https://bibliotekanauki.pl/articles/1030343.pdf
Data publikacji:
2017-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
CdS/BiOI heterojunctions
visible-light photocatalyst
photocatalytic activity
nanocomposites
Opis:
Novel CdS/BiOI heterojunction photocatalysts were successfully prepared by facile method. The as-prepared samples were characterized by transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, the Raman spectroscopy, UV-vis diffuse reflectance spectra, the Fourier transform infrared spectra, and photoluminescence. It was found that CdS nanoparticles were uniformly distributed on the surface of BiOI microspheres. The photodegradation tests showed that the photocatalytic efficiency was increased at first and then decreased when further increasing CdS content in the nanocomposites. The highest activity was obtained by 3%-CdS/BiOI nanocomposites. The enhanced photocatalytic performances were attributed to the matched band potentials of CdS and BiOI, which resulted in the efficient separation of photogenerated electron-hole pairs. Based on the experimental results, a reasonable photocatalytic mechanism of CdS/BiOI photocatalysts was also proposed.
Źródło:
Acta Physica Polonica A; 2017, 131, 2; 263-270
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anion Removal Potential of Complex Metal Oxides Estimated from Their Atomic Scale Structural Properties
Autorzy:
Chubar, N.
Gerda, V.
Mičušík, M.
Omastova, M.
Heister, K.
Man, P.
Yablokova, G.
Banerjee, D.
Fraissard, J.
Powiązania:
https://bibliotekanauki.pl/articles/1030882.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Rm
68.43.-h
82.80.-d
Opis:
The main common idea of two conference papers delivered at OMEE-2017 was to demonstrate an importance of the speciation level knowledge in modern adsorption materials science. In order to prove this, two groups of adsorptive materials were used: three samples of Mg-Al-CO₃ layered double hydroxides produced by different synthesis methods and ten samples of Fe-Ce oxide-based composites with various ratios of Fe-to-Ce. In both cases of studies, it was not possible to find direct correlation between adsorptive performances of the materials and their structural properties obtained by conventional characterisation techniques. However, anion adsorptive removals of each group of inorganic composites correlated with their structural properties studied on the level of speciation. It was shown that strong anion removal potential of Mg-Al-CO₃ layered double hydroxides was associated with richness in speciation of chemical elements (Mg, Al) and interlayer anions (CO₃²¯) as well as with generous hydration. Adsorptive performances of inorganic anion exchangers based on Fe-Ce hydrous oxides were explained by simulation extended X-ray absorption fine structures simulation. The best anion removers were found to be those Fe/Ce oxide-based composites whose Fe outer shells were formed from backscattering oscillations from both O and Fe atoms.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1091-1096
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing Moon Crescent Visibility Using Contrast-Limited Adaptive Histogram Equalization and Bilateral Filtering Techniques
Autorzy:
Yussof, Wan Nural Jawahir Hj Wan
Man, Mustafa
Umar, Roslan
Zulkeflee, Ahmad Najmuddin
Awalludin, Ezmahamrul Afreen
Ahmad, Nazhatulshima
Powiązania:
https://bibliotekanauki.pl/articles/2058508.pdf
Data publikacji:
2022
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
bilateral filtering
CIELab
CLAHE
image enhancement
moon crescent
Opis:
Image enhancement is becoming increasingly im portant with the advancement of space exploration techniques and the technological development of more durable and sci entifically sound observatories equipped with more powerful telescopes. The enhancement of images helps astronomers an alyze the results and act toward determining the dates of religious festivals. This work describes a technique known as contrast-limited adaptive histogram equalization (CLAHE) with grayscale contrast enhancement and bilateral filtering. We apply CLAHE on the L component of the CIE-Lab color space to adjust lightness contrast. Subsequently, grayscale contrast enhancement is performed to increase the visibility of the moon crescent. Noise caused by grayscale contrast en hancement is reduced using bilateral filtering. Two quantitative measures are selected (PSNR and MSE) to show the visual improvement achieved by the proposed algorithm.
Źródło:
Journal of Telecommunications and Information Technology; 2022, 1; 3--13
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Study on Pore Properties of Hastelloy Powder Porous Metal Fabricated by Electrostatic Powder Coating
Autorzy:
Lee, Min-Jeong
Yi, Yu-Jeong
Kim, Hyeon-Ju
Park, Man-Ho
Kim, Byoung-Kee
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/353929.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
electrostatic powder coating
Hastelloy
porous metal
pore properties
powder coating amount
Opis:
Porous metals show not only extremely low density, but also excellent physical, mechanical and acoustic properties. In this study, Hastelloy powders prepared by gas atomization are used to manufacture 3D geometries of Hastelloy porous metal with above 90% porosity using electrostatic powder coating process. In order to control pore size and porosity, foam is sintered at 1200~1300°C and different powder coating amount. The pore properties are evaluated using SEM and Archimedes method. As powder coating amount and sintering temperature increased, porosity is decreased from 96.4 to 94.4%. And foam density is increased from 0.323 to 0.497 g/cm3 and pore size is decreased from 98 to 560 μm. When the sintering temperature is increased, foam thickness and strut thickness are decreased from 9.85 to 8.13 mm and from 366 to 292 μm.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 547-550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Forming of Acid Mine Drainage Based on Characteristics of Coal Mining, East Kalimantan, Indonesia
Autorzy:
Widayati Amy, Sri
Dani, Umar
Nu'man, Harits
Muslim, Dicky
Nasruddin, Dudi
Nuryahya, Himawan
Nurhasan, Rully
Agustin, Daryl Sarah
Powiązania:
https://bibliotekanauki.pl/articles/27323828.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
coal
sulfur
acid mine drainage
NAPP
net acid production potential
Opis:
As one of the world’s coal producers, Indonesia continues to increase its coal production. The purpose of this study is to identify and analyze the characteristics of coal that has the potential to produce acid mine drainage. The research method is coal mapping and zoning based on formation, observation, and description of coal characteristics, coal sampling, ultimate and proximate testing, and analysis. The results of the study describe the characteristics of coal related to distribution in the early stages of evaluating the potential for acid mine formation, besides that it can be used as a basis for classifying the potential for acid mine drainage which has a high enough total sulfur based on the results of testing on 15 samples. To prevent the reaction to acid mine drainage, it can be based on the geochemical characteristics of coal by constructing a mine reservoir or making water drainage in a mine that is not close to the stockpile, because there is a possibility that water has the potential to form acid mine drainage (AMD) when it comes in contact with coal potential. So that coal does not have the potential to be a source of acid mine drainage.
Źródło:
Journal of Ecological Engineering; 2023, 24, 7; 301--310
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Powder Shape and Sintering Temperature on the Preparation of Ni-Based Porous Metal
Autorzy:
Yi, Yu-Jeong
Lee, Min-Jeong
Kim, Hyeon-Ju
Yang, Sangsun
Park, Man-Ho
Kim, Byoung-Kee
Yun, Jung-Yeul
Powiązania:
https://bibliotekanauki.pl/articles/351782.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Hastelloy
porosity
porous metal
powder shape
sintering temperature
Opis:
Usually porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability for exhaust gas filter, hydrogen reformer catalyst support. The Ni alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. In this study, the Ni-based porous metals have been developed with Hastelloy powder by gas atomization and water atomization in order to find the effects of powder shape on porous metal. Each Hastelloy powder is pressed on disk shape of 2 mm thickness with 12 tons using uniaxial press machine. The specimens are sintered at various temperatures in high vacuum condition. The pore properties were evaluated using Porometer and microstructures were observed with SEM.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 917-920
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System
Autorzy:
Moon, Tae Boong
Han, Chulwoong
Hyun, Soong-Keun
Park, Sung Cheol
Son, Seong Ho
Lee, Man Seung
Kim, Yong Hwan
Powiązania:
https://bibliotekanauki.pl/articles/2049176.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spent lithium-ion battery
smelting
Al2O3-SiO2-CaO-Fe2O3
recovery
slag
Opis:
This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250°C for 30 min on the 20 Al2O3-40SiO2-20Cao-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O2 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20 Al2O3-40SiO2-Cao-Fe2O3 (Cao + Fe2O3 = 40 mass%). in addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 4; 983-986
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The contribution of geophysics to archaeology: a case study of an ancient canal of the Oc Eo culture in the Mekong Delta, Vietnam
Autorzy:
Le, Ngoc Thanh
Nguyen, Quang Dung
Nguyen, Quang Bac
Nguyen, Quang Mien
Nguyen, Dan Vu
Duong, Ba Man
Nguyen, Dinh Chau
Powiązania:
https://bibliotekanauki.pl/articles/184367.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
electromagnetic profiling
electrical resistivity tomography
hand-auger
radiocarbon dating
ancient canal
alluvial deposits
Oc Eo culture
Ba The mountain
Opis:
Generally, underground ancient canals are infilled with alluvial materials, with the canal bed and substrate often having different resistivity values. This study aimed to determine the location and morphology of Malleret’s ancient canal 16 located to the southeast of the Ba The mountain, Mekong Delta, Vietnam by means of geophysical techniques. Two geophysical methods were used: electromagnetic profile and electric resisitivity tomography. A geoelectric structure 70 m long with 70–95 mS/m of apparent conductivity was found. On the electrical resistivity tomography section, a resistivity zone of 10–20 Ω∙m, 1–4 m deep, 70 m wide corresponds to the mentioned above geoelectric structure, which is in an asymmetric U-shape extending toward the southeastern bank of canal 16. Hand-augering confirmed that the canal bed is fully incised into Holocene sediments as a substrate which stretches down to the Pleistocene. The sediments are composed of loams mixed with plant remains with a resistivity ρ ~ 10–15 Ω∙m. Both of the canal banks at a depth of 5 m are made up of Holocene sedi-ments (ρ ~ 4–10 Ω∙m). The 14C measurements determined the age of the organic matter in the canal as being equal to 1210 ±85 BP, suggesting canal 16 ceased being operational at that time. The precise positioning of canal 16 on the ground surface, as well as identifying the morphology of the canal bed, were corroborated by geophysical techniques. The obtained results are of considerable value to archaeologists.
Źródło:
Geology, Geophysics and Environment; 2019, 45, 1; 45-56
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Mulberry Pomace Addition and Transglutaminase Treatment on the Quality of Pasta Enriched with Antioxidants and Dietary Fiber
Autorzy:
Ta, Thi Minh Ngoc
Hoang, Chi Hieu
Nguyen, Thao Mi
Tran, Thi Thu Tra
Ton, Nu Minh Nguyet
Van Viet Man, Le
Powiązania:
https://bibliotekanauki.pl/articles/24024618.pdf
Data publikacji:
2023-10-10
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidant
dietary fiber
mulberry pomace
pasta
transglutaminase
Opis:
Mulberry pomace powder, a by-product of mulberry juice processing, was added to pasta recipe to make pasta with high dietary fiber and antioxidant contents. The effects of mulberry pomace ratio on the nutritional, textural and cooking properties as well as the sensory overall acceptance of the product were investigated. A significant increment in dietary fiber and total anthocyanin contents as well as decrement in cooking quality, texture and color change were observed. The cooking loss increased with the substitution level of mulberry pomace while the optimal cooking time, swelling index and water absorption index decreased. The quality improvement of 10% mulberry pomace fortified pasta was investigated by adding a transglutaminase preparation with enzyme dosage from 0.25 to 1.00 U/g protein. The fortified pasta treated with transglutaminase at 0.50 U/g protein showed a significant improvement in chewiness, tensile strength and elongation rate but was not significantly affected in terms of the swelling index and water absorption. The use of transglutaminase also improved the overall acceptability of the fortified pasta. Mulberry pomace powder may, therefore, be considered a potential antioxidant-rich and dietary fiber-rich material for incorporation into pasta products.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2023, 73, 4; 301-310
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Fiber Crackers Supplemented with Asparagus Hard-Stem: Impacts of Supplementation Ratios and Water Amounts in Cracker Recipe on the Product Quality
Autorzy:
Tran, Thi Thu Tra
Ngo, Le Hong Ngoc
Ton, Nu Minh Nguyet
Le, Thi Hong Nhung
Le, Thi Thuy
Le, Van Viet Man
Powiązania:
https://bibliotekanauki.pl/articles/31341115.pdf
Data publikacji:
2024-05-17
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Tematy:
antioxidant capacity
Asparagus officinalis L
color parameters
consumer acceptability
dietary fiber
hardness
Opis:
Spears or cladophylls are edible parts of asparagus (Asparagus officinalis L.) implemented in a human diet while its hard-stem by-products have been used for animal feeding. In this study, the asparagus hard-stem was proved to be rich in dietary fiber and total phenolics with high antioxidant capacity. Wheat flour was partially replaced by asparagus hard-stem powder (AHP) in the cracker recipe and the AHP ratios were 0 (control), 5, 10, 15, 20% of the blend weight; the nutritional constituents, antioxidant capacities, physical attributes, and sensory overall acceptability of crackers were then evaluated. As the AHP ratio increased from 0 to 20%, the dietary fiber and total phenolic contents of the fortified crackers were improved by 5.0 times and 3.2 times, respectively, while their ferric reducing antioxidant power and DPPH scavenging capacity were enhanced by 6.1 and 1.4 times, respectively. Besides, the elevated ratio of AHP also increased the product hardness and reduced its overall acceptability. The impacts of water amount used in the dough kneading on the high-fiber cracker quality were then investigated. At 20% AHP level, the appropriate water amount was 55 g/100 g of the flour blend to reduce hardness and improve overall acceptability of the fortified crackers. The study results show that AHP is a potential dietary fiber and antioxidant ingredient for high-fiber cracker making.
Źródło:
Polish Journal of Food and Nutrition Sciences; 2024, 74, 2; 162-168
1230-0322
2083-6007
Pojawia się w:
Polish Journal of Food and Nutrition Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sediment discharge and storage over the last deglacial highstand period on the central Vietnam shelf off Nha Trang
Autorzy:
Dung, Bui Viet
Stattegger, Karl
Kieu, Nguyen Van
Thanh, Nguyen Trung
Thong, Bui Xuan
Vu, Pham Nguyen Ha
Man, Ha Quang
Trang, Pham Hong
Powiązania:
https://bibliotekanauki.pl/articles/2058662.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
sediment budget
Nha Trang shelf
central Vietnam
Holocene highstand
sequence stratigraphy
Opis:
A sediment budget for the central Vietnam shelf off Nha Trang over the last deglacial Holocene highstand period has been investigated on the basis of shallow seismic and sediment core data and empirical equations. The annual suspended sediment discharge to the Nha Trang shelf ranges from: 4.3 to 5.4 Mt/year. Estimates based on published empirical equations suggest that the sediment discharge by three main local mountainous rivers (the Cai, Dinh and Van Phong rivers) that enter the Nha Trang shelf ranges between 1.7 and 4 Mt/year, which implies that the local rivers discharge approximately 75% of the total annual sediment input to the shelf. The annual sediment supply of the Cai River is approximately 2 and 6 times higher than that of the Dinh and Van Phong rivers, respectively. The highstand sediment depocentre of the Nha Trang shelf is mostly attached to the local river outflows, indicating their importance as the principal sediment supply sources to the shelf. Additional sources of sediment supply to the Nha Trang shelf can probably be related to along-shore transport from the nearby shelves. Calculations based on seismic and sediment core data indicate that the net sediment volume storage on the Nha Trang shelf is approximately 2.15 Mt/year. Approximately 50% of the total sediment yield supplied to the shelf is probably transported along-shore to the south. The sediment budget model for highstand deposits on the Nha Trang shelf is typical for a small mountainous river basin, which is significantly different from that of the large river delta systems in Vietnam such as the Mekong and Red rivers where 90% of the river sediments are captured on the delta plain/subaqueous part and only 10% of the river sediments are transported to the nearby shelf. In contrast, most of the sediments supplied by small mountainous rivers off Nha Trang are transported to the mid-shelf, forming a shore-parallel mud depocentre.
Źródło:
Geological Quarterly; 2019, 63, 2; 395--406
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 101-168 z 168

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