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Wyświetlanie 1-15 z 18
Tytuł:
Critical Coalescence Concetration (CCC) as a parameter for evaluation of selected quaternary ammonium compounds
Krytyczne stężenie koalescencji (CCC) jako parametr oceny czwartorzędowych związków amoniowych
Autorzy:
Szyszka, D.
Powiązania:
https://bibliotekanauki.pl/articles/89122.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
flotation
surfactants
Critical Coalescence Concentration (CCC)
Opis:
The objective of this paper was to determine the Critical Coalescence Concentration (CCC) of surfactants such as N(dodecyloxycarboxymethyl) N,N,N(trimethylammonium) bromide (DMGM-12), N-[2-(dodecyoxycarboxy)ethyl] N,N,N-(trimethylammonium) bromide (DMALM-12) and N-[3-(dodecanoyloxycarboxy)prophyl] N,N,N-(trimethylammonium) bromide (DMPM-11). The surfactants used represent quaternary ammonium compounds containing a hydrophobic moiety with an ester group (commonly known as “esterquats”). The CCC value was determined by analysis of the relationship between concentration of surfactant and average air bubble diameter. The values of the critical coalescence concentration (CCC) were estimated using a graphical method.
Celem pracy było wyznaczenie krytycznego stężenia koalescencji CCC surfaktantów, takich jak: bromek N-(dodecylooksykarboksymetylo)-N,N,N-trimetyloamoniowy (DMGM-12), bromek N-[2-(dodecylooksykarboksy)etylo]-N,N,N-trimetyloamoniowy (DMALM-12) oraz bromek N-[3-(dodekanoylooksy)propylo]-N,N,N-trimetyloamoniowy (DMPM-11). Zastosowane odczynniki to czwartorzędowe związki amoniowe, zawierające hydrofobową grupę zawierającą grupę estrową (powszechnie nazywane, jako „esterquaty”). Określenie wartości krytycznego stężenia polegało na przeanalizowaniu zależności stężenia badanego surfaktantu od średniej średnicy pęcherzyka powietrza. Wartości krytycznego stężenia koalescencji (CCC) określono za pomocą metody graficznej.
Źródło:
Mining Science; 2013, 20; 101-113
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Population Genetics Models for the Statistics of dna Samples Under Different Demographic Scenarios---Maximum Likelihood Versus Approximate Methods
Autorzy:
Polański, A.
Kimmel, M.
Powiązania:
https://bibliotekanauki.pl/articles/908157.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
demografia
statystyka
DNA samples
demography
coalescence
Opis:
The paper reviews the basic mathematical methodology of modeling neutral genetic evolution, including the statistics of the Fisher-Wright process, models of mutation and the coalescence method under various demographic scenarios. The basic approach is the use of maximum likelihood techniques. However, due to computational problems, intuitive or approximate methods are also of great importance.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2003, 13, 3; 347-355
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Minimal self-joinings and positive topological entropy II
Autorzy:
Blanchard, François
Kwiatkowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/1218579.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
topological coalescence
self-joinings
topological entropy
Opis:
An effective construction of positive-entropy almost one-to-one topological extensions of the Chacón flow is given. These extensions have the property of almost minimal power joinings. For each possible value of entropy there are uncountably many pairwise non-conjugate such extensions.
Źródło:
Studia Mathematica; 1998, 128, 2; 121-133
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forming Limit Diagram, Void Analysis, Strain Distribution and Surface Roughness for SS430 Sheets During Multipoint Incremental Forming
Autorzy:
Ramkumar, K.
Paulraj, G.
Elangovan, K.
Sathiya Narayanan, C.
Powiązania:
https://bibliotekanauki.pl/articles/354796.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FLD
SPIF
MPIF
void coalescence
strain distribution
Opis:
Single point incremental forming process is a most economical Die-less forming process. The major constraint of it is that it is a time consuming process. In this work, a new attempt was made in incremental forming process using Multipoint tool for SS430 sheets to increase the formability and to reduce forming time. Fractography analysis was made to study the size of voids that were formed during fracture. The forming limit diagrams were drawn and compared for single point incremental forming and the multipoint incremental forming of SS430 sheet. It was proved that the formability of SS430 sheet in the multipoint forming was better than the formability of that in single point forming and the time consumed was reduced. The strain distribution in both processes had also been studied along with surface roughness.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1709-1714
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation of air/water interface in mixed aqueous solutions of KCl, NaCl, and DAH
Autorzy:
Gungoren, Can
Powiązania:
https://bibliotekanauki.pl/articles/110641.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bubble coalescence
surface tension
KCl
NaCl
DAH
Opis:
Flotation of soluble salts such as borax, potash, and trona is carried out in their saturated solutions. The high ion concentration of the flotation suspension can affect the floatability of the minerals as well as the coalescence behaviors of the bubbles. The bubble coalescence can be inhibited in the presence of dissolved ions at high ion concentrations as well as with the use of surfactants. In this study, the effect of the mixtures of KCl, NaCl, and dodecyl amine hydrochloride (DAH) on air/water interface was investigated with surface tension and bubble coalescence time measurements for potash flotation. The surface tension measurements indicated that lower surface tension values obtained with mixed KCl and NaCl solutions than their single solutions. In addition, the surface tension of the mixed KCl and NaCl solutions increased with the NaCl and the ionic strength of the solution. The dynamic surface tension measurements indicated that while ion adsorption on air/water interface was so fast, DAH molecules required more time for adsorption probably related to the viscosity of the solution. In addition, the bubble coalescence time measurements showed that the bubble coalescence could be inhibited with the use of DAH in the absence and presence of KCl and NaCl. In the absence of DAH, the bubble coalescence time was determined as 100 ms, 270 ms, and 650 ms, respectively for 100% KCl, 100% NaCl, and 50%KCl+50% NaCl salt solutions. Therefore, the trend in the success of the salt solutions for the inhibition of bubble coalescence can be written as 100%KCl<50%KCl+50%NaCl<100% NaCl according to the bubble coalescence time. The results of this study indicated that there was no clear relationship between the surface tension and the inhibition of the bubble coalescence. However, the bubble coalescence time measurements showed that while the bubble coalescence time was 650 ms in the presence of Na+ ions, it was 100 ms in the presence of K+ ions 100 ms. It can be concluded from the results obtained from this study that the bubble coalescence phenomena may be managed by the specific ion pairing types in solutions which significantly affect the flotation recovery of minerals.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1259-1270
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation of copper-bearing carbonaceous shale in the presence of amine type frothers
Autorzy:
Stodulski, Michał
Drzymała, Jan
Powiązania:
https://bibliotekanauki.pl/articles/764016.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
flotation frothers, copper shale, critical coalescence concentration
Opis:
Hexylamine, chloro-derivative of propylamine, and ammonium chloride were used for flotation of Permian carbonaceous copper bearing shale from the Legnica-Glogow Copper Basin region in SW Poland. It was confirmed that naturally hydrophobic shale, known as Kupferschiefer, can be made floatable by application of short chain amines as frothers. It was also established that the short chain amine chloro-derivatives as well as salmiac, the first member of the amine family, can be used as a frother for flotation of the investigated shale sample. It results from the paper that the investigated amine frothers work similarly if the comparison of the flotation results is made using their concentration expressed in relative form taking into account the critical coalescence concentration of the frother.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel technique to investigate the bubble coalescence in the presence of surfactant (MIBC) and electrolytes (NaCl and CaCl2)
Autorzy:
Gungoren, C.
İslek, E.
Baktarhan, Y.
Kursun, I.
Ozdemir, O.
Powiązania:
https://bibliotekanauki.pl/articles/110886.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
surface tension
salt
Bubble Coalescence Time Measurement
Opis:
An efficiency of flotation process is strongly dependent upon the collecting ability of air bubbles. On the other hand, the liquid film formed beetween two fully or partially mobile air/liquid interfaces being in contact has low stability, which leads to fast liquid drainage. Therefore, when they approach to each other, they tend to coalescence. Therefore, bubble coalescence is usually controlled with frothers in flotation process. Meanwhile, it is known that dissolved ions inhibit bubble coalescence. In this study, the bubble coalescence in the presence of MIBC was determined using a novel technique with a modified bubble-particle attachment timer. Additionally, the effect of NaCl and CaCl2 on bubble behavior was investigated along with surface tension and bubble coalescence time aspects. As a result of study, it is seen that the bubble coalescence time can be successfully determined with a bubble-bubble coalescence timer.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1215-1222
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The collapse of sequential Bayesian estimator in two-target tracking problem
Autorzy:
Stano, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/92973.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
track coalescence
Bayesian operator
target tracking
particle filter
Opis:
Track coalescence is a phenomenon that occurs in multi-target tracking applications where certain types of manoeuvres performed simultaneously by several targets can utterly confuse algorithms that track their positions. In its simplest form, the phenomenon occurs when two similar objects, initially well separated, get close to each other and follow similar manoeuvres for a period of time sufficient to confound the tracking algorithm so that when the objects finally depart from each other the tracking algorithm is prone to provide erroneous estimates. This two-target track coalescence is discussed in this paper with the focus on the compound coalescence, when two identical tracks follow the midpoint of two well separated targets. First, the problem is illustrated on a classic problem of tracking two targets manoeuvring in a clutter, which is modeled as a nonlinear stochastic system. It is shown how, otherwise accurate and precise, estimates obtained by a standard particle filter eventually collapse leading to the coalescence of tracks. The phenomenon is given theoretical explanation by the analysis of Bayesian update operator acting on L2-space of probability densities that reveals that the coalescence is an unavoidable consequence of the probabilistic mixing between distributions describing positions of two targets. Finally, the practical consequences of these theoretical results are discussed together with potential approaches to deal with track coalescence in real applications.
Źródło:
Studia Informatica : systems and information technology; 2018, 1-2(22); 32-45
1731-2264
Pojawia się w:
Studia Informatica : systems and information technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of bubble approach velocity on coalescence in α-terpineol and n-octanol solutions
Autorzy:
Orvalho, S.
Stikova, L.
Stanovsky, P.
Zednikova, M.
Vejrazka, J.
Ruzicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/109759.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bubble
coalescence
frother
approach velocity
non-ionic surfactant
Opis:
This work presents results of an experimental study of the influence of the approach velocity on the coalescence of bubbles in aqueous solutions of n-octanol and α-terpineol. Experiments were performed in a coalescence cell allowing synchronized growth of a pair of bubbles in a liquid. High speed camera imaging was used to characterize the growth of bubbles and their interaction in aqueous solution of different concentrations of surfactants. The coalescence efficiency and contact time till coalescence were determined as a function of the approach velocity between bubbles and the concentration of surfactant. It was found that, for both surfactants, when the approach velocity between bubbles was higher than ~1 mm/s, the coalescence efficiency was independent of the approach velocity and that the contact time was independent of the concentration of surfactant. Below ~1 mm/s, both the coalescence efficiency and the contact time were the function of surfactant concentration. For the higher velocities, the suppression of coalescence occurred at concentrations similar to the concentration of immobilization of the surface of free rising bubbles.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 1; 73-80
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of air flow rate and froth depth on the flotation performance : an industrial case study in a 10 m3 cell
Autorzy:
Ostadrahimi, Mahdi
Farrokhpay, Saeed
Pirmoradi, Saeed
Noparast, Mohamad
Powiązania:
https://bibliotekanauki.pl/articles/2146876.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
entrainment
bubble coalescence
air flow rate
froth depth
Opis:
The main purpose of the froth zone in flotation is to transport all the valuable particles from the pulp zone into the concentrate. However, in practice, a complete recovery of these particles is rarely achieved since some of them are detachment from the bubbles and return to the pulp zone. While this is an important topic in the mineral flotation industry, the previously published papers are mainly limited to small laboratory scales. Therefore, this study aimed to examine the effect of two main flotation variables (air flowrate and froth depth) on the flotation of iron ore in a 10 m3 industrial scale cell. It was found that, when the air flowrate increased from 45 to 146 m3/h, the velocity of the bubble coalescence also increased. In addition, when the froth depth increased from 5 to 30 cm, the product grade showed on average 2 unit increase (for instance, from 12% to 14%) due to the detachment of particles and liquid drainage. It was also found that the flotation concentrates recovery decreased with the increasing froth depth and air flowrate.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 154852
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Frother critical coalescence concentration and dose in flotation of copper-bearing carbonaceous shale
Autorzy:
Szyszka, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/88992.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
frothers
floatation
copper-bearing shale
Critical Coalescence Concentration
CCC
Opis:
The paper presents the yield of carbon-and-cooper-bearing shale from the Legnica and Glogow Copper Basin flotation also called Kupferschiefer in the presence of ethylene, diethylene and trithylene glycol butyl ethers (C4E1, C4E2, C4E3) frothers characterized by frother normalized concentration that is ratio of the frother concentration, and its critical coalescence concentration expressed in different units. It was found that the oucome of flotation is identical provided that the frother concentration is expressed in milimoles per Mg.
Źródło:
Mining Science; 2019, 26; 289-295
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of oil-in-water emulsions using polymer coalescence structures
Autorzy:
Krasiński, A.
Powiązania:
https://bibliotekanauki.pl/articles/207999.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
coalescence structure
application of polymers
oil droplets
struktura koalescencyjna
krople oleju
Opis:
Application of polymer media for coalescence of oil droplets and separation of O/W emulsion was studied. The research was focused on the structural design of a primary coalescence layer. High efficiencies of separation were obtained for structures made of finest fibres. The increase of the average fibre diameter led to a decrease of pressure drop and reduced efficiency of oil droplets removal. Thick fibres performed well as the drainage media and enabled detachment of large droplets. In addition the influence of the material wettability and resulting saturation of coalescence structures on their operation performance was studied.
Źródło:
Environment Protection Engineering; 2016, 42, 2; 19-39
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A cyclonic-static micro bubble flotation column for enhancing coalescence of oil droplets from emulsion
Autorzy:
Li, X.
Yan, X.
Zhang, H.
Powiązania:
https://bibliotekanauki.pl/articles/109842.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
cyclonic-static micro-bubble flotation column
coalescence
multi-flow pattern
oily wastewater
Opis:
In this work a novel cyclonic-static micro bubble flotation column, using hydraulic separator with a conventional flotation column, was developed to separate oil droplets from emulsions. The system integrated the cyclonic and laminar flow coalescence with the pipe flow coalescence. The effect of process parameters such as circulation pressure, aeration rate, feed volumetric flow rate and viscosity of fluid on the efficiency of multi-flow pattern coalescence was investigated. The obtained results indicated that the coalescence efficiency increased with the circulation pressure, feed volumetric flow rate and aeration rate, whereas an increase in viscosity of fluid reduced the extent of coalescence. Besides, the size distribution of oil droplets in the cyclonic separator, pipe flow section and column flotation section were simulated in the flotation column using a special software. The simulation was compared with experimental data on the mean size of oil droplets.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 307-320
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bubbling properties of frothers and collectors mix system
Autorzy:
Batjargal, Khandjamts
Guven, Onur
Ozdemir, Orhan
Karakashev, Stoyan I.
Grozev, Nikolay A.
Boylu, Feridun
Çelik, Mehmet Sabri
Powiązania:
https://bibliotekanauki.pl/articles/2146880.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
critical coalescence concentration (CCC)
Sauter diameter (d32)
bubble size distribution (BSD)
Opis:
This paper studies the effect of the type and concentration of selected frothers and collectors mix system on the bubble sizes (Sauter mean diameter, SMD) of bubbling flow produced in a micro flotation cell and the determination of bubble size distribution (BSD). The usage of dodecyl amine hydrochloride (DAH) collector on the critical coalescence concentration of commercial frothers PPG200, PPG400, and PPG600 was investigated in detail. The results of these studies showed that the usage of DAH decreased the CCC of these frothers. Each frother + collector mixing system exhibited its unique ability in preventing coalescence of the bubbles in the order of PPG200 < PPG400 < PPG600. The factorial experiments established that the type of the frother, collector, and their concentration had a major effect on the size of the bubbles. The BSD in the presence of PPG600 + DAH mix system resulted in a little bit wider BSD which indicated the effect of frother type in mixed systems.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152890
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hermeneutic Dimension of Lexical-Syntactic Word Formation (in Ukrainian Language and Literature)
Autorzy:
Andrishko, Oleh
Popovskyi, Anatolii
Powiązania:
https://bibliotekanauki.pl/articles/2231299.pdf
Data publikacji:
2022-10-06
Wydawca:
Komisja Nauk Filologicznych Polskiej Akademii Nauk, Oddział we Wrocławiu
Tematy:
lexical-syntactic word formation
coalescence
Ukrainian language
Ukrainian literature
a priori and a posteriori occasionalisms
Opis:
The article considers lexical and syntactic word formation based on works of Ukrainian literature. Hermeneutics is closely related to philology, but most often examines the text from the point of view of literary criticism. The linguistic aspect, namely the study of occasionalisms, is much less studied. Attention to Ukrainian culture is growing, and in this context it can be an interesting source of hermeneutic research. This article examines the most interesting examples of occasionalisms, which by their function and non-standard structure are divided into two types – a priori and a posteriori. The difference between coalescences (words formed in a lexical-syntactic way) and similar words and phenomena has also been clarified. Most of these words are related to holophrases, but in Ukrainian literature there are examples that we call a posteriori coalescences, they are formed according to individual authorial models and have almost no analogues in the texts of other writers. We hope that this study will be an important step in the study of Ukrainian language and literature in the world and will draw attention to Ukrainian culture – a culture with millennial traditions.
Źródło:
Academic Journal of Modern Philology; 2022, 15; 49-59
2299-7164
2353-3218
Pojawia się w:
Academic Journal of Modern Philology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 18

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