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Tytuł:
Dispersive effect of low molecular weight sodium polyacrylate on pyrite-serpentine flotation system
Autorzy:
Zhao, K.
Yan, W.
Wang, X.
Gu, G.
Deng, J.
Zhou, X.
Hui, B.
Powiązania:
https://bibliotekanauki.pl/articles/110158.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
dispersant
serpentine
flotation
surface potential
dispersion mechanism
Opis:
In this work, the dispersive effect of low molecular weight sodium polyacrylate (PAAS) on serpentine, and its dispersion mechanism were systematically investigated through zeta potential measurements, micro and batch flotation as well as adsorption tests. At pH 5, where flotation of iron sulphide was routinely performed, pyrite and serpentine minerals were oppositely charged, and therefore they were attracted to each other. Slime coatings of serpentine adhered to the surface of pyrite, decreasing the adsorption density of a collector on the pyrite surface, but also reducing the flotation recovery. PAAS increased the flotation recovery of pyrite by promoting dispersion between pyrite and serpentine. The effective flotation separation of pyrite from the refractory iron sulphide ore was possible by using PAAS as a dispersant. Anionic PAAS adjusted the surface potential of serpentine through adsorption on the serpentine surface and changed the interaction between pyrite and serpentine particles from attractive to repulsive, and then dispersed pyrite and serpentine.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 1200-1213
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffuse-layer surface potentials of colemanites mined in Turkey
Autorzy:
Senol-Arslan, Dilek
Drelich, Jaroslaw W.
Powiązania:
https://bibliotekanauki.pl/articles/2146938.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
colemanite
surface potential
atomic force microscopy
boron
DLVO
Opis:
Colemanite crystal specimens were handpicked at Kestelek, Emet (Hisarcik, Espey), Bigadic mines in Turkey for characterization of their composition and surface potential. X-ray diffraction analysis revealed no differences in mineralogical makeup of the crystals, but elemental analysis indicated differences in the type of trace (<0.1 wt%) elements. Zeta potential measurements showed small differences in zeta potential values, with isoelectric points (iep) varying from about pH = 9.6 to pH = 10.2. However, no correlation was found between iep and the type of trace elements. Additionally, atomic force microscopy (AFM) was employed to measure the colloidal interactions between a silicon nitride (Si3N4) cantilever tip and colemanite crystal surfaces in 1 wt% colemanite-saturated aqueous solutions at three different pHs (8.4, 9.4 and 11). The Derjaguin-Landau-Verwey-Overbeek theory (DLVO) was applied to examine the AFM tip interactions with colemanite surfaces in an aqueous solution of colemanite saturated solutions. The results revealed attractive forces at pH = 8.4 and 9.4 and repulsive forces at pH = 11, confirming the location of an isoelectric point for colemanite specimens somewhere between pH = 9.5 and pH = 10.1. Theoretical analysis of the force curves using the DLVO theory allowed for assessment of both surface charge density and surface potential for colemanite specimens used in this study.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 151933
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fundamental solution of the problem describing ship motion in waves
Autorzy:
Jankowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/255889.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
ship hydrodynamics
boundary value problem
free-surface potential flows
fundamental solution
Opis:
The problem describing a ship motion in waves comprises the Laplace equation, boundary condition on wetted surface of the ship, condition on the free surface of the sea in the form of a differential equation, the radiation condition, and a condition at infinity. This problem can be transformed to a Fredholm equation of second kind, and then numerically solved using the boundary element method, if the fundamental solution of the problem is known. This paper presents the derivation of the fundamental solution. In physical interpretation, the fundamental solution represents the moving and pulsating source under free surface of the sea. The free surface elevation, generated by the source for different forward speed and frequency of pulsation, is presented in this paper.
Źródło:
Opuscula Mathematica; 2006, 26, 3; 471-481
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of liquid motion in a partly filled tank
Autorzy:
Warmowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/255682.pdf
Data publikacji:
2006
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
nonlinear boundary value problem
linear elliptic equations
sloshing
free-surface potential flows
Opis:
The paper presents the problem of liquid motion in a 2D partly filled tank. It is assumed that the flow of liquid in tank is a potential, hence it can be described by Laplace equations with appropriate boundary conditions. The problem is solved using the boundary element method. The developed numerical algorithm makes it possible to determine the free surface elevation, the velocity field and the pressure field during the liquid motion in the tank. The area occupied by liquid is represented by a mesh changing in time. Numerical computations are performed for translatory and rotational motion of the tank. The results of numerical computations are verified by experiment.
Źródło:
Opuscula Mathematica; 2006, 26, 3; 529-540
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fizyczne parametry powierzchni ciał stałych i ich zależność od warunków zewnętrznych. Cz. 1, Podstawy teoretyczne niektórych pojęć (wielkości) powierzchniowych
Physical parameters of solid surfaces and their dependence on the outside conditions. Part 1, Basic theoretical principles of some surface concepts
Autorzy:
Wojas, W.
Wojas, J.
Powiązania:
https://bibliotekanauki.pl/articles/210573.pdf
Data publikacji:
2009
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
potencjał
napięcie
powierzchniowa bariera potencjału
różnica potencjałów kontaktowych
kondensator sferyczny
potential
voltage
surface potential barrier
contact potential difference
spherical capacitor
Opis:
W pracy przeprowadzono analizę teorii podstawowych zjawisk fizycznych występujących na powierzchni metali i półprzewodników. Przedyskutowano powstawanie na powierzchni: potencjału elektrycznego, bariery potencjału, kontaktowej różnicy potencjałów (napięcia kontaktowego) i innych parametrów powierzchni. Omówiono spektroskopię fotonapięcia powierzchniowego i jego inwersję. Podano przykładowe wartości różnicy potencjałów kontaktowych na granicy zetknięcia się metali lub między kolektorem a emiterem w próżniowym kondensatorze kulistym służącym do badania fotoemisji elektronów.
In this paper we analyse the theory of basic physical phenomena on the surface of metals and semiconductors. We discuss a phenomenon of: electrical potential, potential barrier, contact potential difference, and other surface parameters arising on the surface. The spectroscopy of surface voltage and its inversion are described. We present the examples of values of the contact potential difference for metals or between collector and emitter in vacuous spherical capacitor for investigation of electron photoemission.
Źródło:
Biuletyn Wojskowej Akademii Technicznej; 2009, 58, 2; 377-390
1234-5865
Pojawia się w:
Biuletyn Wojskowej Akademii Technicznej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Relationship Between the Heats of Formation and the Molecular Electrostatic Potentials of Polyazaarenes
Autorzy:
Bartošková, M.
Friedl, Z.
Powiązania:
https://bibliotekanauki.pl/articles/358483.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
high-nitrogen compounds
azines
azoles
heat of formation
molecular surface electrostatic potential
Opis:
In order to characterize the explosive properties of high-nitrogen, energetic compounds, the heats of formation, either in the gas or the solid state, are often used as preliminary data. Their relationship to the number of nitrogen atoms involved is usually known, so exploring it cannot furnish any new information. However, the very promising, quantitative structure property relationship (QSPR) approach utilizes the molecular surface electrostatic potential V(r). We have therefore performed calculations for 12 azines and 10 azoles by the DFT B3PW91/cc-pVTZ method, and constructed their gas phase heats of formation Δf H°(298,g) by means of the isodesmic reaction approach. The acquired gas phase heats of formation Δf H°(298,g) were correlated with the molecular surface electrostatic potentials VS,max, VS,min, and VS(ring), which were calculated by the B3LYP/6-31G(d,p)//B3PW91/cc-pVTZ method. It is shown that the VS(ring) electrostatic potential describes very precisely the structures of high-nitrogen N-heteroaromatics, with both consecutive and isolated nitrogen atoms, and their thermodynamic properties.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 1; 103-112
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwój metod badawczych związanych z Dyrektywą ATEX w Laboratorium Badań Stosowanych
Development of testing methods associated with ATEX Directive in the Laboratory of Applied Tests
Autorzy:
Kamiński, T.
Lesiak, K.
Orzech, Ł.
Talarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/198920.pdf
Data publikacji:
2014
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
zaplecze naukowo-badawcze
ATEX
wyładowanie elektrostatyczne
potencjał powierzchniowy
osłona ognioszczelna
testing infrastructure
electrostatic discharge
surface potential
fire-proof shields
Opis:
W artykule przedstawiono nowe metody badawcze związane z Dyrektywą ATEX wdrożone do stosowania w Laboratorium Badań Stosowanych. Przedstawiono możliwości badawcze nowo zakupionego wyposażenia i stanowisk badawczych. Zaprezentowano wyniki badań rozkładu potencjału powierzchniowego po wystąpieniu wyładowania z powierzchni materiałów nieprzewodzących. Zaprezentowano przebieg wybuchu mieszaniny metanowo-powietrznej podczas badań małych elementów. Opisano stanowisko do badań osłon ognioszczelnych „d” i zaprezentowano zarejestrowany przebieg zmian ciśnienia podczas wybuchu podstawowych mieszanin gazowych stosowanych w badaniach.
New testing methods associated with ATEX Directive implemented in the Laboratory of Applied Tests are presented. Testing potential of newly purchased equipment and tests stands is given. The results of testing the distribution of surface potential after discharge from non-conducting materials are presented. Process of explosion of methane-air mixture during testing of small components is given. Stand for testing the “d” fireproof shields is described and the recorded curve of pressure changes during explosion of tested main flammable gases is shown.
Źródło:
Maszyny Górnicze; 2014, 32, 1; 29-35
0209-3693
2450-9442
Pojawia się w:
Maszyny Górnicze
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Swobodna powierzchnia wody i jej fizykochemiczne właściwości
Free surface of water and its physicochemical properties
Autorzy:
Paluch, M.
Powiązania:
https://bibliotekanauki.pl/articles/171602.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
granica faz woda/powietrze
swobodna powierzchnia wody
struktura powierzchni swobodnej wody
potencjał powierzchniowy wody
water air interface
structure of free surface of water surface potential of water
Opis:
The purpose of this paper is to show how interesting is free surface of water and how many problems connected with its properties were investigated. Some of them were studied in twenty century, another are quite new. The special attention was drawn to orientation of water molecules at water/air interface and connected with this orientation electric surface potential drop existing at the free surface. To date, there is no consensus both as to its value and sign. This is due to the impossibility of direct measurement of the surface potential, which caused that many scientists have attempted to estimate the value and sign of this potential indirectly by measuring other physical parameters or using simulation methods. The paper present also such properties of water/air interface as: surface density, surface viscosity, dielectric permittivity, surface conductivity ,surface tension and their changes as a result of adsorption process. As we can see from the review outlined in the paper the free surface of water in spite of long and different of studies is still fascinating for many scientists.
Źródło:
Wiadomości Chemiczne; 2015, 69, 7-8; 541-557
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Potential Energy Surface (PES) scan of gas-phase L-proline
Autorzy:
El Guerdaoui, A.
El Kahoui, Y.
Bourjila, M.
Tijar, R.
El Gridani, A.
Powiązania:
https://bibliotekanauki.pl/articles/412094.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ab initio calculations
L-proline
density functional theory
potential energy surface
Opis:
We performed here a systematic ab initio calculations on neutral gas-phase L-proline. A total of 8 local minima were located by geometry optimization of the trial structures using density functional theory (DFT) with B3LYP three parameter hybrid potential coupled with the 6-31G)d( basis set. The absolute minimum obtained will be subject to a rigid potential energy surface (PES) scan by rotating its carboxylic group using the same method with more accurate basis set B3LYP/6-311++G(d,p), to get a deeper idea about its conformational stability. The main aim of the present work was the study of the rigidity of the L-proline structure and the puckering of its pyrrolidine ring.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 19, 1; 26-34
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation Analysis of CMOS Technologies Using Surface-Potential MOSFET Model
Autorzy:
Mattausch, H. J.
Yumisaki, A.
Sadachika, N.
Kaya, A.
Johguchi, K.
Koide, T.
Miura-Mattausch, M.
Powiązania:
https://bibliotekanauki.pl/articles/308251.pdf
Data publikacji:
2009
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
compact model
fabrication inaccuracy
field-effect transistor
macroscopic
microscopic
potential at channel surface
silicon
within wafer
Opis:
An analysis of the measured macroscopic withinwafer variations for threshold voltage (Vth) and on-current (Ion) over several technology generations (180 nm, 100 nm and 65 nm) is reported. It is verified that the dominant microscopic variations of the MOSFET device can be extracted quantitatively from these macroscopic variation data by applying the surface-potential compact model Hiroshima University STARC IGFET model 2 (HiSIM2), which is presently brought into industrial application. Only a small number of microscopic parameters, representing substrate doping (NSUBC), pocket-implantation doping (NSUBP), carrier-mobility degradation due to gate-interface roughness (MUESR1) and channel-length variation during the gate formation (XLD) are found sufficient to quantitatively reproduce the measured macroscopic within-wafer variations of Vth and Ion for all channel length Lg and all technology generations. Quantitative improvements from 180 nm to 65 nm are confirmed to be quite large for MUESR1 (about 70%) and Lmin(XLD) (55%) variations, related to the gate-oxide interface and the gate-stack structuring, respectively. On the other hand, doping-related technology advances, which are reflected by the variation magnitudes of NSUBC (30%) and NSUBP (25%), are found to be considerably smaller. Furthermore, specific combinations of extreme microscopic parameter-variation values are able to represent the boundaries of macroscopic fabrication inaccuracies for Vth and Ion. These combinations are found to remain identical, not only for all Lg of a given technology node, but also for all investigated technologies with minimum Lg of 180 nm, 100 nm and 65 nm.
Źródło:
Journal of Telecommunications and Information Technology; 2009, 4; 37-44
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical study of kinetic isotope effects on hydrogen abstraction reactions
Autorzy:
Kurosaki, Y.
Powiązania:
https://bibliotekanauki.pl/articles/147000.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ab initio molecular orbital method
hyrogen abstraction reaction
potential energy surface
secondary isotope effect
transition state theory
tunneling
Opis:
Effects of isotopic substitutions of "spectator" hydrogens on rate constants have been theoretically examined for the CH3 + H2 ' CH4 + H (I) and C2H + H2 ' C2H2 + H (II) reactions using variational transition state theory with the multidimensional semiclassical tunneling correction. A small but significant secondary isotope effect was found for reaction (I) but almost no isotope effect was found for reaction (II). This is because the potential energy surface for reaction (II) has an "early" character.
Źródło:
Nukleonika; 2002, 47,suppl.1; 81-88
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of mesoporous silica: laboratory exercises for students
Autorzy:
Kosmulski, Marek
Mączka, Edward
Powiązania:
https://bibliotekanauki.pl/articles/763958.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
SBA-15
specific surface area
zeta potential
Opis:
Synthesis and characterization of SBA-15 were proposed as a laboratory course: linked series of exercises for graduate students. The standard preparation method was modified to fit a typical schedule of students’ classes, that is, 3-hours units every second week. The properties of materials obtained by different students’ groups were compared with the properties of materials obtained by means of a standard method.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 2
2083-358X
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of oxidation roasting on ilmenite flotation
Autorzy:
Mehdilo, A.
Irannajad, M.
Rezai, B.
Powiązania:
https://bibliotekanauki.pl/articles/109387.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation
ilmenite
oxidation roasting
surface chemistry
zeta potential
Opis:
In this study, the oxidation roasting was used to modify the ilmenite chemistry to improve the collector adsorption and ilmenite flotation behavior. The results indicated that the increase of the roasting temperature up to 600 ºC increased the ilmenite flotation recovery. The maximum collector adsorption density occurred on ilmenite roasted at 600 °C which resulted in the increase of ilmenite flotation recovery from 73.5% to 91% at pH 6.3. This improvement was attributed to a greater conversion of Fe2+ to Fe3+ ions and significant decrease in the zeta potential of ilmenite. At the roasting temperatures of 750 °C and 950 °C, ilmenite was converted to rutile and some trivalent iron containing phases such as hematite and pseudobrookite. Under these conditions, the collector adsorption and hence ilmenite flotation improved, however the flotation recovery decreased after the roasting at 950 °C.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 493-505
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zeta potential of Teflon in presence of monovalent and divalent ions
Autorzy:
Gulgonul, Ilhan
Powiązania:
https://bibliotekanauki.pl/articles/110571.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
polytetrafluoroethylene
PTFE surface
natural hydrophobic
zeta potential
contact angle
Opis:
In this study, the specific effects of Na+ and Ca2+ ions on natural hydrophobic Teflon particles and flat Teflon surfaces were investigated using zeta potential and contact angle measurements, respectively. The zeta potential measurements showed that the surface charge of Teflon was negative at all pH values in the absence of salt ions, and became the positive with the increased salt concentration, and obtained an iso electric point (iep) between pH 3 and 4. The results also indicated that Ca+2 ions more adsorbed on the Teflon surface compared to Na+ ions in the case of the compression of the electrical double layer. The contact angle measurements with Teflon sample showed that while the flat Teflon had a contact angle of 107° at pure water, and the contact angle considerably reduced as a function of salt concentration. This decrease was more effective in the presence of Ca2+ ions rather than Na+ ions. While calcium is a strong water structure maker cation, sodium is a weak structure maker cation, but the role of calcium is more effective at the Teflon-water interface according to zeta potential and contact angle measurements. It is revealed that the Ca+2 ions have a specific effect on Teflon surface due to low salt concentrations and ion charges. The different effects of these cations on Teflon-water interface can be attributed to use in mineral processing, especially in flotation enrichment.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 3; 792-801
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Leaf Area Formation and Photosynthetic Activity of Sunflower Plants Depending on Fertilizers and Growth Regulators
Autorzy:
Domaratskyi, Yevhenii
Powiązania:
https://bibliotekanauki.pl/articles/1838274.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
sunflower
photosynthesis
photosynthetic potential
chlorophyll
fractional composition
assimilation surface
Opis:
The study presents scientific substantiation and determination of the dependence of leaf area formation and photosynthetic activity of sunflower plants under the influence of fertilizers and growth regulators. The field research was conducted in 2015-2017 in the fields of the Voznesensk district in the Mykolaiv region, Ukraine (GPS: 47.630518, 32.078974). The soil of the research field is common black soil with little humus accumulation and the content of hydrolyzed nitrogen – 1.5-1.8; the content of highly absorbable phosphorous – 4.5-7.0 and the content of exchangeable potassium – 12-15 mg/100 g of soil. The research was carried out by a two-factor scheme, where Factor A – the rate of mineral nutrition (the test plot without fertilizers; N30P45; N60P90); and Factor В – foliar feeding with the Wuxal Microplant, Khelafit Combi and Fitomare preparations. The weather conditions in the years of the research were typical for this growing zone. It was established that the year 2017 was the least favorable with excessively low soil moisture and high temperature regime for growing the crop, and the weather conditions of 2015 and 2016 were the most favorable for cultivating sunflower. The research made it possible to determine that fertilizers combined with multifunctional preparations had a considerable impact on the leaf area and photosynthetic potential of agrocenosis. It proves that foliar feeding of sunflower plants at the stage of 6-8 true leaves with growth regulators contributed not only to a change in the total chlorophyll content, but also to its fractional composition. In all the cases there was a major increase in the content of the fraction "а". In particular, the maximal increase in this fraction was 90%, whereas the difference did not exceed 76% in the fraction "b". Under nonfertilized conditions these indices were 48 and 13%, respectively.
Źródło:
Journal of Ecological Engineering; 2021, 22, 6; 99-105
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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