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    Wyświetlanie 1-26 z 26
    Tytuł:
    The influence of pre-aeration on cyanide leaching of a non-refractory sulphide gold and silver ore
    Autorzy:
    Aydin, B.
    Basturkcu, H.
    Gul, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/951867.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nonrefractory sulphide gold–silver
    cyanidation
    lead nitrate
    hydrogen peroxide
    aeration
    Opis:
    The leaching behaviour of a sulphide gold-silver ore was investigated in terms of a relationship between gold and silver extractions and cyanide consumption. Ninity five Au % and 88.0% Ag extractions were obtained under the determined conditions of 24 h leaching duration, -74 μm particle size, 40% solids ratio, 4 g/dm3 NaCN concentration, and 450 rpm stirring speed with NaCN consumption of 3.35 g/dm3. Since the NaCN consumption was higher than in industrial applications, Pb(NO3)2 and H2O2 additions and aeration using an air pump were tested during leaching in order to decrease the consumption. While Pb(NO3)2 addition with aeration caused a decrease in the metal extractions, the individual or combined additions of H2O2 and aeration could not provide a reduction in the cyanide consumption. Therefore, the effect of the pre-aeration followed by cyanidation was tested. Eventually, applying 4 h of pre-aeration before a shorter leaching duration of 12 h provided 92.0% Au and 90.5% Ag extractions with a reduced NaCN consumption of 2.44 g/dm3.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 647-660
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Beneficiation of arsenic bearing complex sulphide ore by flotation
    Autorzy:
    Gul, A.
    Bulut, G.
    Sirkeci, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/110834.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    arsenic
    non-toxic depressants
    sulphide minerals
    flotation
    Opis:
    In this study beneficiation of a sulphide ore from the Gümüşhane-Black Sea Region of Turkey was investigated. Detailed flotation studies were carried out with the ore sample which contained 2.95% Pb, 6.72% Zn and 0.32% Cu. Mineralogical analyses showed that the sample includes pyrite, galena, sphalerite, chalcopyrite, tennantite, cerussite, anglesite and smithsonite. On the other hand, hematite, goethite, limonite, calcite and quartz were determined as gangue minerals. Selective sulphide concentrates with low arsenic content were tried to be produced by froth flotation. Individual concentrates of Pb, Zn and Cu assayed 67.54% Pb, and 61.49% Zn and 23.31% Cu where corresponding recoveries were 73.0% and 77.1% and 38.7%, respectively. Arsenic contents were less than 2000 ppm in the lead and zinc con-centrates. Copper concentrate assayed 5.03% As since the major copper minerals were in tennantite form (copper arsenic sulphide mineral). In flotation tests, non-toxic reagents such as metabisulphite, caustified starch, and activated carbon were used to depress minerals in relevant circuits.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2013, 49, 1; 203-212
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quick survey for detection, identification and characterization of Acanthamoeba genotypes from some selected soil and water samples across Pakistan
    Autorzy:
    Tanveer, T.
    Hameed, A.
    Gul, A.
    Matin, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/51342.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of mechanical strength of iron ore pellets using raw and activated bentonites as binders
    Autorzy:
    Gul, A.
    Sirkeci, A. A.
    Boylu, F.
    Guldan, G.
    Burat, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/109658.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bentonite
    pelletizing
    iron ore concentrate
    binder
    sodium bicarbonate
    Opis:
    In this study, sodium, calcium, and mixed bentonite samples were used as binders in the pelletizing fine iron ore concentrate obtained from the Divrigi Iron Ore Concentration Plant in Turkey. In the pelletizing tests, sodium bentonite sample was used as received and after upgrading process. Additionally, the calcium bentonite sample required activation by sodium bicarbonate while the mixed bentonites sample was used untreated and as well as activated. The pellets produced were tested for compressive strengths, drop number, and porosity in order to characterize the pellets. The results showed that untreated and upgraded sodium bentonite samples provided relatively stronger pellets compared to calcium and the mixed type bentonite samples needed activation with sodium bicarbonate to increase the strength of the pellets. Based on the results of the drop number, compressive strengths, and porosity, it is possible to make pellets which meet the standards by adequate addition of type and amount of bentonite.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 1; 23-36
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of crushing type on the efficiency of flowing film separation
    Autorzy:
    Sirkeci, A. A.
    Gul, A.
    Bulut, G.
    Ozer, M.
    Guven, O.
    Perek, K. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/109918.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    particle shape characteristics
    liberation degree
    chromite
    shaking table
    Opis:
    In recent years, the influence of different crushing systems (compression, impact, attrition) has been receiving more attention due to their significant role on particle liberation and shape of particles. The objective of this study was to investigate the effects of different crushing systems on both liberation degree and shape factors of chromite particles along with their enrichment conditions by shaking table. The tests were conducted on -1+0.5, -0.5+0.212 and -0.212 mm size fractions using the Wilfley type shaking table. The results of these tests showed that concentrates with higher metal contents were obtained by impact crushing of chromite in proportion to higher liberation degree and roundness of particles. Therefore, it was found that selective breakage can well be obtained by impact crushing in all fractions. The results of this study demonstrated the importance of crushing type on the liberation and enrichment processes.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 2; 601-608
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cryptosporidiosis outbreak on a dairy farm: Detection of Cryptosporidium parvum as a causative agent in the water source
    Autorzy:
    Karakavuk, M.
    Can, H.
    Döşkaya, M.
    Karakavuk, T.
    Erkunt-Alak, S.
    Köseoğlu, A.E.
    Gül, A.
    Ün, C.
    Gürüz, Y.
    Değirmenci-Döşkaya, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087099.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neonatal calves
    Cryptosporidium parvum
    diarrhea
    Real-time PCR
    calf lose
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 3; 323-333
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coaxial Circular Jet Flows with Conical Attachments
    Autorzy:
    Inan, A.
    Gul, M.
    Isikan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401427.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.27.wg
    47.80.Cb
    Opis:
    This study is devoted to experiments on jet flows, which have many application areas. It shows the obtained jet flow structure. The experiments were carried out in a subsonic sucking wind tunnel having cross-section of 32×32 cm², length of 75 cm, and turbulence densities of 0.5%. One-channel hot-wire anemometer (HWA) was used in measurements. For circular jet, a steel pipe was used with a length of 120 cm and a diameter of 8 mm. Air generator was used for generating air into the jet flow and measurements were done at different jet flow velocities. Moreover, a conical diffuser with a length of 21 cm and 6° slope was attached to the nozzle exit and effect of this diffuser on jet flow was examined. Seven types of measurement in three different categories were carried out. In experimental studies, velocity and turbulence distribution, axial velocity variation, jet half widths and, using these, jet diffusion rates and angles were measured. Moreover, flow analyses were done by drawing moment and frequency distribution for measurement sensitivity. These experimental results were compared with the studies on jet flow.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1373-1379
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Speciation of heavy metals during co-composting of livestock manure
    Autorzy:
    Gul, S.
    Naz, A.
    Fareed, I.
    Khan, A.
    Irshad, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/778398.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    heavy metals
    fractionation
    composting
    manure
    temporal changes
    Opis:
    Heavy metals determination in manures provides beneficial information to predict the availability and the potential contamination of environment. Therefore, a study was carried out to investigate heavy metals changes in livestock manure during a co-composting process. The metals were stepwise fractionated into exchangeable, adsorbed, organically bound, carbonate precipitated and residual forms by extracting with 0.5M KNO3, de-ionized water, 0.5M NaOH, 0.05M Na2EDTA and 4M HNO3, respectively. During the extraction process, the amount of metals remained highly dependent on an extraction method and stage of manure composting. Extractions released heavy metals contents in the final composted manure as Zn > Cu > Pb > Cr > Ni > Cd. Irrespective of the days of composting, extracting agents differed in the order HNO3 > Na2EDTA > NaOH > KNO3 > H2O for all heavy metals. Higher concentrations of heavy metals were observed during the early stages of composting. Conversely, there was a progressive increase in the concentrations of K, Ca and Mg during composting of manure. Total C in the manure reduced with composting days.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 3; 19-23
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Situation of Women of a Refugee and Immigrant Background in the Netherlands
    Autorzy:
    Gul-Rechlewicz, Violetta
    Powiązania:
    https://bibliotekanauki.pl/articles/1811320.pdf
    Data publikacji:
    2021-10-28
    Wydawca:
    Uniwersytet Warszawski. Centrum Europejskie
    Tematy:
    Refugees
    Women
    Immigrants
    Discrimination
    Integration
    Labour Market
    Emancipation
    Netherlands
    Opis:
    The problem of discrimination and unequal treatment of women from culturally diverse backgrounds affects countries such as the Netherlands. The centuries of tolerance and openness to an “alien” seem to be ending. This is evidenced by numerous reports and scientific studies, statements from specialists, and experts on the issues of immigrant integration. Increasingly, feeling marginalised and deprived of development opportunities, immigrant or refugee women come to the fore. Some of them (those remaining in isolation) are represented by aid organisations, i.e. foundations, associations, volunteer groups, and the municipalities themselves. This article covers the existing issue of the increasing number of refugees and immigrants in the Netherlands, especially refugee and immigrant women towards whom, according to specialists, integration policy should be redefined.
    Źródło:
    Studia Europejskie - Studies in European Affairs; 2021, 25, 3; 59-82
    1428-149X
    2719-3780
    Pojawia się w:
    Studia Europejskie - Studies in European Affairs
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Agregacja ocen decydentów dla systemu predykcji czasów realizacji procesów budowlanych
    Aggregation of decision maker ratings for a construction processes durations prediction system
    Autorzy:
    Tomczak, Michał
    Polat, Gül
    Powiązania:
    https://bibliotekanauki.pl/articles/27323950.pdf
    Data publikacji:
    2023
    Wydawca:
    PWB MEDIA Zdziebłowski
    Opis:
    Jednym z najistotniejszych i najbardziej wymagających zagadnień występujących w ramach inżynierii przedsięwzięć budowlanych jest problem opóźnień w realizacji przedsięwzięć budowalnych. Znaczna liczba czynników ryzyka niezbędnych do uwzględnienia oraz stopień skomplikowania opisu ich wpływu na poszczególne procesy przedsięwzięcia budowlanego sprawiają, że zagadnienie predykcji czasów realizacji procesów i przedsięwzięć budowlanych jest zagadnieniem trudnym. W odpowiedzi na dostrzeżony problem opracowano metodę agregacji ocen decydentów za pomocą rozmytej obwiedni typu 2 rozszerzonego wahającego się rozmytego zbioru terminów lingwistycznych służącą predykcji czasów realizacji procesów budowlanych. W proponowanym podejściu decydenci mogą wyrażać swoje oceny poprzez porównywanie parami, tak jak ma to miejsce w powszechnie akceptowanej metodzie AHP. Decydenci mogą wyrażać swoje preferencje tak swobodnie, jak to możliwe, za pomocą wyrażeń językowych zamiast wartości liczbowych, co jest bliższe ludzkiej kognitywistce i naturze. Decydenci nie muszą ograniczać się do wyrażania preferencji za pomocą pojedynczych słów, mogą używać całych wyrażeń dostarczonych przez zdefiniowaną gramatykę. W celu zobrazowania funkcjonowania metody wykonano predykcję czasów realizacji przykładowego przedsięwzięcia budowlanego z wykorzystaniem opracowanej metody.
    One of the most important and challenging issues occurring in construction project engineering is the problem of delays in the execution of construction projects. The significant number of risk factors necessary to take into account and the complexity of describing their impact on the various processes of a construction project make the issue of predicting the execution times of construction processes and projects a difficult one. In response to the perceived problem, a method of aggregating decision makers' assessments using a fuzzy envelope type-2 extended hesitant fuzzy set of linguistic terms was developed for predicting the execution times of construction processes. In the proposed approach, decision makers can express their evaluations through pairwise comparisons, as in the widely accepted AHP method. Decision makers can express their preferences as freely as possible using linguistic expressions instead of numerical values, which is closer to human cognition and nature. Decision makers do not have to limit themselves to expressing preferences with single words, they can use whole expressions provided by a defined grammar. In order to illustrate how the method works, a prediction of the execution times of an example construction project was made using the developed method.
    Źródło:
    Builder; 2023, 27, 12; 95--99
    1896-0642
    Pojawia się w:
    Builder
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Travelling wave solutions of the non-linear wave equations
    Autorzy:
    Haider, Jamil A.
    Rahman, Jamshaid U.
    Zaman, Fiazud D.
    Gul, Sana
    Powiązania:
    https://bibliotekanauki.pl/articles/2204690.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    nonlinear evolution problems
    coupled equations
    Jacobi elliptic functions
    periodic solutions
    Opis:
    This article focuses on the exact periodic solutions of nonlinear wave equations using the well-known Jacobi elliptic function expansion method. This method is more general than the hyperbolic tangent function expansion method. The periodic solutions are found using this method which contains both solitary wave and shock wave solutions. In this paper, the new results are computed using the closed-form solution including solitary or shock wave solutions which are obtained using Jacobi elliptic function method. The corresponding solitary or shock wave solutions are compared with the actual results. The results are visualised and the periodic behaviour of the solution is described in detail. The shock waves are found to break with time, whereas, solitary waves are found to be improved continuously with time.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 2; 239--245
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Behavior of Copper/MWCNT Nanocomposites Produced by Pulse Electrodeposition
    Autorzy:
    Gül, H.
    Uysal, M.
    Akbulut, H.
    Alp, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1181744.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Pq
    78.67.Sc
    81.40.Pq
    61.48.De
    Opis:
    Copper coatings containing well-distributed multiwalled carbon nanotubes were obtained by pulse electrodeposition in acidic sulfate bath in order to improve the microhardness and wear resistance of coatings. Multiwalled carbon nanotubes concentration was determined as the most significant factor for the incorporation of multiwalled carbon nanotubes in copper based electrolyte. The amount of embedded multiwalled carbon nanotubes and the microhardness of nanocomposites were found to increase with the increase of multiwalled carbon nanotubes in the electrolyte. The tribological properties of nanocomposites deposited by pulse electrocodeposition technique were studied by reciprocating ball on-disk method. The characterization of the coatings was investigated by scanning electron microscopy and X-ray diffraction facilities. The experimental results indicated that the wear resistance of copper composite is superior to that of pure copper. The friction coefficient and wear rates decreased with the increase in the concentration of multiwalled carbon nanotubes in the electrolyte.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 254-256
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A System of B-C-N-O: Synthesis, Characterization and Determination of Unit Cell Parameters
    Autorzy:
    Gül, G.
    Kurtuluş, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033375.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.20.Ea
    61.66.-f
    61.66.Fn
    84.40.-x
    Opis:
    Boron-rich solids are good candidates to apply instead of diamond. Boron has a unique crystal structure and compounds of it are resistant to heat treatment. These structures have light density, high hardness, and chemically inertness. Also, boron compounds display thermal and electronic properties as a thermoelectric power at high temperatures. A boron, carbon, nitrogen, and oxygen containing compound was synthesized for the first time by classical microwave method using elemental amorphous boron, active carbon, and urea with 1:1:1 molar ratio. The compound is crystallized in monoclinic system with unit cell parameters a=12.9575 Å, b=9.3264 Å, c=9.6529 Å, β =113.277° which are calculated by POWD indexing program. The X-ray diffraction, POWD, the Fourier transform infrared, scanning electron microscopy/energy X-ray diffraction spectroscopy and thermogravimetric/different thermal analysis were achieved.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 36-38
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiotracer investigations of municipal sewage treatment stations
    Autorzy:
    Farooq, M.
    Khan, I.
    Ghiyas-ud-Din, Ghiyas-ud-Din
    Gul, S.
    Palige, J.
    Dobrowolski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/971492.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    wastewater treatment
    residence time distribution
    activated sludge
    radiotracer
    Opis:
    Tracer techniques, which are well-established methods in process dynamics studies in industry, were applied to investigate the dynamics of sewage treatment process. The concept of residence time distribution (RTD) was used to investigate the efficiency of the primary clarifier, aeration tank and secondary clarifier of a sewage treatment plant. Preliminary treatment and modeling of the tracer data was performed using the software DTS Pro Ver. 4.20. A big short - circuiting (by-passing) with a large volume of stagnant zones were found in the primary and secondary clarifiers, while no stagnant zone was detected in the aeration tank.
    Źródło:
    Nukleonika; 2003, 48, 1; 57-61
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barriers to immigrant entrepreneurship: A causal relationship analysis of the Asian immigrant entrepreneurs in Germany employing the DEMATEL approach
    Autorzy:
    Sabary, Gul Shah
    Ključnikov, Aleksandr
    Powiązania:
    https://bibliotekanauki.pl/articles/22401196.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    immigrant entrepreneurship
    causal relationship
    immigrant barriers
    DEMATEL method
    Opis:
    Research background: Entrepreneurship and migration are top priorities on many national and international agendas. As a result, entrepreneurship is one of the most popular strategies immigrants use to avoid unemployment in a host country. However, studies lack to discuss causal relationships among key barriers to immigrant entrepreneurs. Purpose of the article: This study attempts to fill the knowledge gap and investigate the causal relationship between the primary obstacles faced by Asian immigrant entrepreneurs in Germany. Methods: A predesigned questionnaire was used in face-to-face interviews with Asian business owners in Germany for the study, and the Decision-Making Trial and Evaluation Laboratory (DEMATEL) method of data analysis was used. Findings & value added: The findings reveal that lack of sufficient financial resources to establish a business, high market competition, and a lack of knowledge of the local language of the host country are the most significant barriers, among others, which may severely hamper Asian immigrant business performance and have a considerable impact on their entrepreneurial decision. At the same time, lack of professional knowledge & skills, problems with rules & regulations, and cultural differences are among the least essential obstacles for Asian immigrant entrepreneurs. The findings show that unfamiliarity with the local language, problems with rules and regulations, cultural differences, and lack of international business experience are associated with the causer category. However, lack of enough capital to establish a venture, lack of professional knowledge and skills, difficulty in access to financial resources, and high market competition relate to the receiver category. This research generates value for policymakers, particularly those participating in migration studies. One of the study's novelties is using the DEMATEL framework for decision-making on barriers to immigrant entrepreneurship in the European context.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2023, 18, 2; 491-522
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating
    Autorzy:
    Uysal, M.
    Cetinkaya, T.
    Gul, H.
    Kartal, M.
    Algul, H.
    Tokur, M.
    Alp, A.
    Akbulut, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401294.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.47.Aa
    81.15.-z
    73.61.At
    Opis:
    In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was varied by using different concentrations of SnSO₄ in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 1106-1108
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reverse osmosis as one-step wastewater treatment: a case study on groundwater pollution
    Autorzy:
    Ali, W.
    Rehman, W. U.
    Younas, M.
    Ahmad, M. I.
    Gul, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/779416.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    reverse osmosis (RO)
    membrane separation
    Total Dissolved Solids (TDS)
    Total Coliform
    E. Coli
    Opis:
    The present case study is focused on performance evaluation of a Reverse Osmosis (RO) membrane based pilot plant to treat the ground/surface drinking water sources polluted by flood, rivers and/or canals. The RO plant was designed, fabricated and then operated with polluted water. Two feed water samples having a TDS of 2.000 mg · L−1 and 10.000 mg · L−1 respectively, were taken and analyzed for physical, chemical and microbiological contaminants. The RO plant was run once through over a span of 100 hrs at an operating pressure of 15 bar. TDS rejections were found to be more than 94% while permeate flux was measured to be 25.82 L · m−2 · hr−1 to 40.55 L · m−2 · hr−1. Results show that RO plant has a potential to remove physical, chemical and microbiological contaminants like Total Coliform and E. Coli in one step.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 4; 42-48
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Darcy-Forchheimer 3D Williamson nanofluid flow with generalized Fourier and Fick’s laws in a stratified medium
    Autorzy:
    Ramzan, M.
    Gul, H.
    Zahri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199972.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Generalized Fourier and Fick’s laws
    Darcy-Forchheimer porous medium
    Thermal and solutal stratification
    Williamson nanofluid
    Opis:
    Mathematical analysis for 3D Williamson nanofluid flow past a bi-directional stretched surface in Darcy-Forchheimer permeable media constitutes the focus of this study. The novelty of the proposed model is augmented by the addition of thermal and solutal stratification with chemical species and variable thermal conductivity. Calculations of the suggested model are conducted via the renowned homotopy analysis method (HAM). The results obtained are validated by comparing them in a limiting form with an already published article. Excellent harmony is achieved in this regard. Graphical structures, depicting impacts of assorted arising parameters versus the profiles involved are also provided. It is noticed that the velocity profile is a dwindling function of the Williamson parameter and Hartmann number. It is also stated that the Cattaneo-Christov heat flux exhibits conventional Fourier and Fick’s laws behavior when both coefficients of thermal and concentration relaxations are zero.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 327-335
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical risk assessment in hospital settings: A comparison of workers perceptions, expert opinions, and occupational hygiene measurements
    Autorzy:
    Coşkun Beyan, Ayşe
    Tuna, Gamze
    Emerce, Esra
    İşlekel, Gül
    Powiązania:
    https://bibliotekanauki.pl/articles/22391038.pdf
    Data publikacji:
    2023-11-14
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    occupational exposure
    risk perception
    chemical risk
    quantitative assessment
    health care workers
    occupational hygiene measurement
    Opis:
    Background Harmful chemicals are used in various forms from different sources in hospital settings. The standard gold method in risk control studies still determines exposure by personal or ambient measurements. In the absence of trained personnel, resources, or sufficient time, qualitative methods should be used to assess exposure. This study aims to compare quantitative and qualitative results of chemical risk exposure. Material and Methods Both qualitative (perceptions without monitoring data of the workers and experts) and quantitative perceptions (perceptions with monitoring data) were recorded. Two experts were asked to evaluate exposure intensity in pathology department workers, secretary workers, and cleaning workers. Occupational hygiene measurements were taken based on the occupational health and safety department risk assessment results, expert job analysis, and pilot study measurements. Results While most workers reported feeling highly exposed to chemical risks, the majority of experts reported medium-risk exposures and high-risk exposures. Three occupational hygiene measurements (3/45: 6.6%) exceeded the permissible time-weighted average, and the other results were within the acceptable range. Conclusions There was a significant difference between the estimated exposure and the measured exposure in hospital settings. A correlation was not found between workers’ perceptions of chemical risk exposure and the chemical risk levels measured in this study.
    Źródło:
    Medycyna Pracy. Workers’ Health and Safety; 2023, 74, 4; 241-250
    0465-5893
    2353-1339
    Pojawia się w:
    Medycyna Pracy. Workers’ Health and Safety
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wykluczenie i marginalizacja jako zapora dla integracji imigrantów w europejskich społeczeństwach zróżnicowanych kulturowo i etnicznie
    Exclusion And Marginalization As A Barrier To The Integration Of Immigrants In European Culturally And Ethnically Diverse Societies
    Autorzy:
    Gul-Rechlewicz, Violetta
    Powiązania:
    https://bibliotekanauki.pl/articles/1402247.pdf
    Data publikacji:
    2020
    Wydawca:
    Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej
    Tematy:
    immigrants
    integration
    discrimination
    mulriculturalism
    West Europe
    Netherlands
    Opis:
    The integration of immigrants and refugees (especially since the migration crisis) is at the heart of the world’s socio-political discourse. Acceptance of the arrivals by the receiving societies is nowadays in considerable doubt. The countries of the European Union (especially the so-called old Union) have found themselves at a crossroads. On the one hand, they want to respect their traditions, values such as tolerance and openness to „strangers,” while on the other hand, an alarmingly high percentage of European citizens do not accept the growing number of foreigners (especially those of Muslim origin) within their countries, according to statistical data. The article points out worrying, growing phenomena of racial discrimination, unequal treatment, and exclusion, making it difficult for immigrants and refugees to find themselves in a new reality for them, mainly blocking their integration in the new society.
    Źródło:
    Polonia Journal; 2020, 11; 85-107
    2083-3121
    Pojawia się w:
    Polonia Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hopelessness against desire to pursue a career in tourism: An empirical analysis of Sinop University, Turkey
    Autorzy:
    Bayram, Ali Turan
    Kavlak, Hasan Tahsin
    Dogra, Jeet
    Bayram, Gül Erkol
    Powiązania:
    https://bibliotekanauki.pl/articles/1797715.pdf
    Data publikacji:
    2020-12-30
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    tourism education
    careers of tourism students
    careers in tourism
    level of hopelessness and desire
    tourism students
    Opis:
    The aim of this work is to demonstrate the relationship between the level of hopelessness of students in tourism education and their desire to make a career in tourism. The data was collected from bachelor-level students in Sinop, a city at the top of Turkey’s life satisfaction and happiness index, by using a survey technique. In order to describe the data collected, frequency and arithmetic mean tests were used, whereas t-tests and variance analysis were used to determine differences between variables, and correlation was used to determine the relationship. As a result of the research, it was found that there is a negative relationship between the desire to make a career in tourism and level of hopelessness amongst the students.
    Źródło:
    Turyzm; 2020, 30, 2; 115-123
    0867-5856
    2080-6922
    Pojawia się w:
    Turyzm
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odczuwanie braku nadziei a pragnienie budowania kariery w turystyce: analiza empiryczna przeprowadzona na Uniwersytecie w Synopie, Turcja
    Autorzy:
    Bayram, Ali Turan
    Kavlak, Hasan Tahsin
    Dogra, Jeet
    Bayram, Gül Erkol
    Powiązania:
    https://bibliotekanauki.pl/articles/1797695.pdf
    Data publikacji:
    2020-12-30
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    kierunki turystyczne
    kariera zawodowa studentów turystyki
    kariera w branży turystycznej
    poziom braku nadziei i zwątpienia
    Opis:
    Celem niniejszej pracy jest przedstawienie związku pomiędzy poziomem nadziei studentów kierunków turystycznych a ich pragnieniem zrobienia kariery w branży turystycznej. Dane zostały zebrane za pomocą ankiety, w której udział wzięli studenci studiów licencjackich w Synopie – mieście cieszącym się w Turcji najwyższym wskaźnikiem szczęścia oraz zadowolenia z życia. W celu opisu zebranych informacji wykorzystano test średniej częstotliwości oraz test średniej arytmetycznej; test T oraz analizę wariancji przeprowadzono, by określić różnice pomiędzy zmiennymi, z kolei analizę korelacji – by ustalić zależności pomiędzy nimi. W wyniku badania odkryto, że istnieje korelacja negatywna pomiędzy pragnieniem zrobienia kariery w branży turystycznej a odczuwaniem braku nadziei wśród studentów.
    Źródło:
    Turyzm; 2020, 30, 2; 129-137
    0867-5856
    2080-6922
    Pojawia się w:
    Turyzm
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1.28 Tbps DWDM optical network design using a dispersion compensating distributed Raman amplifier over S-band
    Autorzy:
    Gul, Baseerat
    Ahmad, Faroze
    Powiązania:
    https://bibliotekanauki.pl/articles/2206823.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    dense wavelength division multiplexing
    conventional single mode fibre
    optical signal to noise ratio
    stimulated Raman scattering
    S-band
    dispersion compensating fibre
    Opis:
    A 100 km long dense wavelength division multiplexed optical network design with a capacity of 1.28 Tbps is proposed in this paper. The novelty of this work is the use of a dispersion compensating fibre as a Raman amplifier in the S-band for a high-capacity dense wavelength division multiplexing network. The transmission is accomplished auspiciously in the wavelength range from 196 THz to 202. 35THz. The coupling of a Raman amplifier made the realisation of the S-band possible in the network, as the erbium-doped fibre amplifier is competent for amplification in C- and L-bands only. Further, a pump coupler is used for multiple pumping to enlarge the gain spectrum for a high-capacity optical network. The performance analysis of the network is carried out systematically in terms of bit error rate (BER), eye diagram, Q-factor, and optical signal to noise ratio (OSNR). The results demonstrate that the proposed set-up shows adequately low BER, sufficient Q-factor values, wide eye-opening, and commendable OSNR for all receiving channels.
    Źródło:
    Opto-Electronics Review; 2023, 31, 2; art. no. e146104
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key motivational factors behind Asian immigrant entrepreneurship: A causal relationship analysis employing the DEMATEL approach for Germany
    Autorzy:
    Sabary, Gul Shah
    Durda, Lukáš
    Asad, Arif Ibne
    Ključnikov, Aleksandr
    Powiązania:
    https://bibliotekanauki.pl/articles/22443108.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    immigrant entrepreneurship
    causal relationship
    pull and push factors
    the Decision-Making Trial and Evaluation Laboratory (DEMATEL) method
    Opis:
    Research background: Immigrant entrepreneurship remains a key issue for researchers, politicians, and policymakers. It has been widely discussed from different angles among various researchers in recent studies ? particularly in Europe. However, there is a lack of studies to present the motivation of the causal relationship between immigrant entrepreneurs. Purpose of the article: This study aims to fill the gap and analyze the causal relationship between the motivations of Asian immigrant entrepreneurs in Germany. Methods: The study was conducted through a face-to-face interview using a predesigned questionnaire from Asian business owners in Germany and the Decision-Making Trial and Evaluation Laboratory (DEMATEL) approach was applied to analyze the data. Findings & value added: The results show that capital acquisition, employment, financial problems in the family, and existence opportunities in the market are the factors that have higher priority, and may highly impact the Asian immigrant entrepreneurial decision. On the other hand, relatives or social networks remain the lowest priority factor that encourages Asian immigrants towards self-employment. The study has also found that entrepreneurship in the family, the state support policy for immigrants, low level of education, unfamiliarity with the local language, and dissatisfaction with the previous job belong to the cause group. However, some of the motivating factors relate to the effect group, such as capital acquisition, opportunity in the market, immigrant community ties or social networks, unemployment, and financial problems in the family. The most affected factor among the effect group is unemployment, while immigrant community ties or social network is the least affected factor. This study includes a novel interpretation of the DEMATEL approach that researchers have not yet addressed; therefore, it is highly relevant for policymakers, especially those interested in migration studies. Finding out the main driving forces behind Asian immigrant entrepreneurs in a developed European nation like Germany and how these drivers affect cause-and-effect interactions between them are the contributions that add value to the field.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2023, 18, 1; 287-318
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water-related diseases following flooding in South Asian countries – a healthcare crisis
    Autorzy:
    Ahmed, Syed Hassan
    Shaikh, Taha Gul
    Waseem, Summaiyya
    Zahid, Maha
    Mohamed Ahmed, Khabab Abbasher Hussien
    Irfan, Ullah
    Hasibuzzaman, Md Al
    Powiązania:
    https://bibliotekanauki.pl/articles/40554755.pdf
    Data publikacji:
    2024-03-30
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    floods
    South Asia
    vector-borne disease
    water-based disease
    water-borne disease
    water-washed disease
    Opis:
    Introduction and aim. Industrialization and elevated greenhouse gas emissions pose significant threats to the environment, raising atmospheric carbon dioxide levels and leading to climate change. Climate change may impact human health either directly via increasing extreme weather frequency and altering disease patterns or indirectly via social institutions and disrupted global supply chain resulting in consequences like undernutrition. Material and methods. This review conducted a comprehensive literature search on PubMed, Google Scholar, and Cochrane Library, from inception to September 2022, using relevant keywords. Analysis of the literature. Massive flooding in South Asia is leading to a surge in water-related diseases. Cholera outbreaks have occurred in countries like Pakistan, India, and Bangladesh following floods, and waterborne diseases like typhoid, rotavirus, hepatitis A, and leptospirosis are prevalent in flood-affected regions. Additionally, Cryptosporidium, Campylobacter, Shigella, and Polio outbreaks are reported. Water-scarce diseases, including scabies, impetigo, and cellulitis, are also on the rise in flood-affected areas. Water-based diseases, such as dracunculiasis, schistosomiasis, and Leishmaniasis, pose significant risks. Vector-borne diseases, including malaria, dengue, and Leishmaniasis, are becoming more prevalent due to flooded areas providing breeding grounds for disease vectors like mosquitoes and sandflies. These diseases are now more common in flood-affected regions, affecting millions of people. Conclusion. Urgent measures are needed, including early warning systems, resilient infrastructure, drainage maintenance, and stricter land-use regulations, to reduce the impact of these natural disasters. International cooperation and immediate action at national and global levels are essential to mitigate the health crises caused by flooding and other natural disasters.
    Źródło:
    European Journal of Clinical and Experimental Medicine; 2024, 22, 1; 232-242
    2544-2406
    2544-1361
    Pojawia się w:
    European Journal of Clinical and Experimental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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