Autor: Castro, S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Physico-chemical factors in flotation of Cu-Mo-Fe ores with seawater: a critical review
Autorzy:: Castro, S.
Powiązania:: https://bibliotekanauki.pl/articles/109447.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: pyrite
chalcopyrite
molybdenite
Seawater flotation
Metabisulfite
Opis:: This paper aims to provide a comprehensive review on the physico-chemical factors governing the flotation of Cu-Mo-Fe sulfide ores in seawater, which is different from NaCl or KCl solutions because it contains hydrolysable ions such as Mg²⁺, Ca²⁺, HCO3-, CO3^2-, etc., which can precipitate with lime as hydroxides, Ca, and Mg insoluble salts. Under pH 9.0 Mg²⁺ ions do not depress molybdenite. However, over the critical pH of precipitation of Mg(OH)2 (pH>10.0), molybdenite is strongly depressed in seawater. This detrimental effect on molybdenite discards the use of lime to depress pyrite in Cu-Mo-Fe ores floated in seawater. In plant practice, the use of sodium metabisulfite (MBS) has replaced lime as a pyrite depressant. It works at pH 6.5-7.0 where the natural floatability of molybdenite is enhanced. Consequently, pH control in rougher and cleaning circuits, and the use of MBS to depress pyrite, have allowed the successful use of non-desalinated seawater in flotation of Cu-Mo-Fe sulfide ores at industrial scale.
Źródło:: Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1223-1236
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Effect of seawater main components on frothability in the flotation of Cu-Mo sulfide ore
Autorzy:: Laskowski, J. S.
Castro, S.
Ramos, O.
Powiązania:: https://bibliotekanauki.pl/articles/109747.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: seawater
froth stability
Cu-Mo flotation
magnesium ions
molybdenite flotation
Opis:: The main problem in the flotation of Cu-Mo sulfide ores in seawater is poor floatability of molybdenite at pH>9.5. Froth stability plays a very important role in determining concentrate grade and recovery in flotation operations and in this paper both floatability and frothability have been tested. The frothability have been studied by measuring froth equilibrium layer thickness in a modified laboratory flotation cell. Two chemical aspects of seawater need to be considered: the content of NaCl (around 87% of salinity), and the concentration of secondary ions (around 13%) (sulfate, magnesium, calcium, bicarbonate ions, etc.). Seawater, NaCl solutions, and seawater’s ions were found to depress frothability. The effect of pH on frothability over the pH range from 9.5 to 11, which is very strong in freshwater, becomes negligible in seawater and the tested electrolyte solutions. The analysis of the relationship between the mechanisms of molybdenite depression and the loss of frothability in seawater implies that the effects of the studied ions on molybdenite floatability and on pulp frothability are different. While depression of molybdenite floatability could be tracked down to magnesium hydroxide precipitation as a main culprit, the depression of frothability is a much more complicated issue.
Źródło:: Physicochemical Problems of Mineral Processing; 2014, 50, 1; 17-29
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Role of calcium and magnesium cations in the interactions between kaolinite and chalcopyrite in seawater
Autorzy:: Uribe, L.
Gutierrez, L.
Laskowski, J. S.
Castro, S.
Powiązania:: https://bibliotekanauki.pl/articles/109955.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: froth flotation
chalcopyrite
chalcopyrite flotation
clay minerals
kaolinite
seawater
slime coating
Opis:: A number of flotation plants around the world have increased the use of seawater due to limited sources of fresh water. The aim of this research work is to study the role that Mg2+ and Ca2+ ions play in the interactions between kaolinite and chalcopyrite in seawater. In order to achieve this objective, the effect of kaolinite on flotation of chalcopyrite is studied over the pH range from 8 to 11, when flotation is carried out in seawater and in a 0.01M NaCl solution. The influence of calcium, magnesium, sodium, and potassium ions on the extent of depression by kaolinite is evaluated. The micro-flotation results indicate that chalcopyrite is depressed by kaolinite in both 0.01 NaCl solution and seawater. In the 0.01 NaCl solution, the depressing effect of kaolinite decreases as the pH increases from 8 to 11. However, the results obtained using seawater show that the depressing effect of kaolinite is similar to what is observed in a 0.01 NaCl solution only at pH values below 9, but above this pH kaolinite significantly affects the recovery of chalcopyrite. The results from experiments with using solutions containing individual cations show that the depressing action of kaolinite in the presence of Mg2+ and Ca2+ is more obvious at pH values of 9 and 10, respectively, which correlates with the pH values at which the first hydroxy-complexes of these divalent cations start forming. This seems to indicate that depressing effect of kaolinite on chalcopyrite in seawater may be related to formation of hydrolyzed species of calcium and magnesium. These species can induce heterocoagulation between kaolinite and chalcopyrite. The trends observed in the micro-flotation experiments are in good agreement with the results of the induction time measurements and slime coating tests.
Źródło:: Physicochemical Problems of Mineral Processing; 2017, 53, 2; 737-749
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: School-based physical activity and good practices in Europe
Dobre praktyki w zakresie szkolnej aktywności fizycznej w Europie
Autorzy:: Nash Castro, L.S.
Svastisalee, C.M.
Mendes, R.
Fontaine, O.
Breda, J.
Powiązania:: https://bibliotekanauki.pl/articles/2053446.pdf
Data publikacji:: 2019
Wydawca:: Akademia Bialska Nauk Stosowanych im. Jana Pawła II w Białej Podlaskiej
Tematy:: physical activity
child
school
health policy
preschool
aktywność fizyczna
dziecko
szkoła
polityka zdrowotna
przedszkole
Opis:: Background. Despite the known benefits of physical activity for children, inactivity levels remain high in Europe. Schools are considered ideal settings for promoting physical activity. Nonetheless, they often fail to achieve their full potential in increasing the levels of exercise among students. This study aimed to examine the current evidence regarding physical activity promotion in the European Union school context, and to understand how key scientific evidence and World Health Organization (WHO) guidance are used. Material and methods. Representatives of all 28 European Union Member States were asked to complete a survey to understand their national school-based physical activity practices. Results. Responses from 22 countries were received. Of all the initiatives, most included fostering of positive attitudes to physical activity or health, while a few incorporated genderbased considerations in their design. Lastly, intersectoral collaboration in the creation of the physical education curricula is yet to be fully integrated among European Union Member States. Conclusions. There is a substantial focus on physical activity promotion in schools across the European Union, although the school context could be utilized to a greater degree. In general, further efforts in this area are required in order to have a stronger positive effect on physical activity levels in European Union children.
Wprowadzenie. Pomimo powszechnie znanych korzyści wynikających z aktywności fizycznej dzieci, jej poziom w Europie nadal pozostaje niski. Szkoły są uważane za idealne miejsca do promowania aktywności fizycznej, jednak ich potencjał często nie jest w pełni wykorzystywany. Celem tego badania jest analiza aktualnych danych dotyczących promowania aktywności fizycznej w szkołach w Unii Europejskiej oraz zrozumienie sposobów wykorzystywania kluczowych dowodów naukowych oraz wytycznych WHO. Materiał i metody. Reprezentantów wszystkich 28 państw członkowskich Unii Europejskiej poproszono o wypełnienie ankiety, której celem było poznanie szkolnych praktyk w zakresie aktywności fizycznej. Wyniki. Otrzymano odpowiedzi z 22 krajów. Spośród przedstawionych inicjatyw większość obejmowała promowanie pozytywnego nastawienia do aktywności fizycznej i zdrowia. Tylko w niewielu przypadkach uwzględniono aspekty związane z płcią. Okazało się, że międzysektorowa współpraca w tworzeniu programów nauczania wychowania fizycznego nie jest jeszcze w pełni zintegrowana wśród państw członkowskich Unii Europejskiej. Wnioski. W całej Unii Europejskiej kładzie się duży nacisk na promowanie aktywności fizycznej w szkołach, choć rola szkoły w tym zakresie powinna być wykorzystana w większym stopniu. Reasumując, należy podjąć dalsze działania, które mogą podnieść poziom aktywności fizycznej dzieci w Unii Europejskiej.
Źródło:: Health Problems of Civilization; 2019, 13, 1; 9-18
2353-6942
2354-0265
Pojawia się w:: Health Problems of Civilization
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Development of User Guide on Interactive Way-Finder and E-Notices System
Autorzy:: Ganiron Jr, Tomas U.
Manlutac, Karen B.
Castro, Monino S. P.
Jerusalem, Catherine R.
Powiązania:: https://bibliotekanauki.pl/articles/1059524.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Announcement
interactive way finder
map locator
schedule
software engineering
wayfinding
Opis:: Time is everything and with people demanding everything to be faster with the little patient, working with old school conventional technology is losing out. The primary goals of this research are to understand the benefits of fast and easy access through the interactive touch screen way-finder. The Interactive Way-Finder and E-Notices on Display for University campus is a collaborative map locator using a touch screen monitor with kiosk, plotting schedule for the faculty and announcement display. the system is running smoothly, It is ready to be implemented and can be used by the beneficiary. A modified questionnaire was used to seek the needed data in evaluating the functionalities of the system. The criteria of evaluation of software quality were adapted in ISO/IEC 25010:2011.
Źródło:: World Scientific News; 2019, 128, 2; 363-390
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: 4-amine-2-mercaptopyrimidine modified silica gel applied in Cd(II) and Pb(II) extraction from an aqueous medium
Autorzy:: Pereira, A.S.
Ferreira, G.
Caetano, L.
Castro, R.S.D.
dos Santos, A.
Padilha, P.M.
Castro, G.R.
Powiązania:: https://bibliotekanauki.pl/articles/778413.pdf
Data publikacji:: 2010
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: 4-amino-2-merkaptopirymidyna
krzemionka
ekstrakcja metali
środowisko wodne
4-amine-2-mercaptopyrimidine
silica
metal extraction
aqueous medium
Opis:: This paper discusses silica surface modification by a process involving a two-step reaction: anchoring of a silylating agent, followed by an attachment of a 4-amino-2-mercaptopyrimidine molecule. The modified material (Si-BP) was successfully characterized by the FTIR spectra, which revealed amine absorption bands, and through 13C and 29Si NMR spectra, which confirm the proposed structure of the modified silica (Si-BP). Si-BP was used to extract cadmium and lead from an aqueous medium at 298 K. The Si-BP kinetics towards metal ions was very fast, i.e., about 10 minutes, although extraction was significantly impaired at pH 3. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum extraction capacity was 0.193 and 0.387 mmol g-1 for Cd(II) and Pb(II), respectively. An analysis of the Ř values lead to the inference that the resulting metal ligand complex was type 1:1.
Źródło:: Polish Journal of Chemical Technology; 2010, 12, 1; 7-11
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Radiation-induced cancer risk and decision-making in a simulated Cs-137 urban event
Autorzy:: Andrade, Edson R.
Gomes, Renato G.
Stenders, Ricardo
Brum, Tercio
Lima, Sergio X.
Castro, Mariana S. C.
Silva, Ademir X.
Powiązania:: https://bibliotekanauki.pl/articles/146858.pdf
Data publikacji:: 2020
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: environmental contamination
dispersive device
decision-making
Opis:: The triggering of a “dirty bomb” generates a complex scenario, with enormous challenges for the responders due to initial misinformation and the urgency to act quickly yet effectively. Normally, the first 100 h are decisive for perceiving the risk in a more realistic dimension, but the support of methodologies that rely on computational simulations can be valuable when making key decisions. This work seeks to provide support for the early decision-making process by using a Gaussian model for the distribution of a quantity of Cs-137 spread by a radiological dispersive device (RDD). By sequentially joining two independent programs, HotSpot Health Physics codes and RESidual RADiation (RESRAD)-RDD family of codes, we came up with results that suggest a segmented approach to the potentially affected population. These results advocate that (a) the atmospheric stability conditions represented by the Pasquill–Gifford classes and (b) the population subgroups defi ned by radiation exposure conditions strongly influence the postdetonation radiological effects. These variables should be taken into account in the elaboration of flexible strategies that include many climatic conditions and to prioritize attention to different groups of public at risk. During the initial phases of such an event, it is believed that simulations using Gaussian models may be of value in anticipating the possible changes in key variables during the decision-making process. These variables may severely affect the effectiveness of the actions of responders and the general public’s safety.
Źródło:: Nukleonika; 2020, 65, 1; 37-43
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Convolutions, integral transforms and integral equations by means of the theory of reproducing kernels
Autorzy:: Castro, L. P.
Saitoh, S.
Tuan, N. M.
Powiązania:: https://bibliotekanauki.pl/articles/256011.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: Hilbert space
linear transform
reproducing kernel
linear mapping
convolution
norm inequality
integral equation
Tikhonov regularization
Opis:: This paper introduces a general concept of convolutions by means of the theory of reproducing kernels which turns out to be useful for several concrete examples and applications. Consequent properties are exposed (including, in particular, associated norm inequalities).
Źródło:: Opuscula Mathematica; 2012, 32, 4; 633-646
1232-9274
2300-6919
Pojawia się w:: Opuscula Mathematica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Using complex networks to understand the mental lexicon
Autorzy:: Vitevitch, Michael S.
Goldstein, Rutherford
Siew, Cynthia S.Q.
Castro, Nichol
Powiązania:: https://bibliotekanauki.pl/articles/1151864.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: mental lexicon
network science
word recognition
word production
Opis:: Network science is an emerging discipline drawing from sociology, computer science, physics and a number of other fields to examine complex systems in economical, biological, social, and technological domains. To examine these complex systems, nodes are used to represent individual entities, and links are used to represent relationships between entities, forming a web-like structure, or network, of the entire system. The structure that emerges in these complex networks influences the dynamics of that system. We provide a short review of how this mathematical approach has been used to examine the structure found in the phonological lexicon, and of how subsequent psycholinguistic investigations demonstrate that several of the structural characteristics of the phonological network influence various language-related processes, including word retrieval during the recognition and production of spoken words, recovery from instances of failed lexical retrieval, and the acquisition of word-forms. This approach allows researchers to examine the lexicon at the micro-, meso-, and macro-levels, holding much promise for increasing our understanding of language-related processes and representations.
Źródło:: Yearbook of the Poznań Linguistic Meeting; 2014, 1, 1
2449-7525
Pojawia się w:: Yearbook of the Poznań Linguistic Meeting
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Susceptibility of Hypsipyla grandella (Lepidoptera: Pyralidae) to Bacillus thuringiensis strains
Autorzy:: Castro, M.T.
Montalvao, S.C.L.
Monnerat, R.G.
Powiązania:: https://bibliotekanauki.pl/articles/66443.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Hypsipyla grandella
Lepidoptera
Pyralidae
susceptibility
Bacillus thuringiensis
pest
Meliaceae
insect attack
mahogany
Swietenia macrophylla
cedar
Cedrella odorata
andiroba
Carapa guianensis
branch
shoot
leaf
fruit
bark
root
Brazil
Opis:: The use of Bacillus thuringiensis (Bt) to control insect pests has already been established in various agronomic and forest crops. It is a bacterium that does not pollute the environment, is safe for mammals and vertebrates, lacks toxicity to plants and specifically targets insects. To date in-depth studies have not been conducted about the use of Bt to control the main pest of mahogany (Swietenia macrophylla King) and other Meliaceae species, the Hypsipyla grandella Zeller (Lepidoptera: Pyralidae). Therefore, this study aimed to test the pathogenicity of Bt strains on H. grandella caterpillars, as well to determine the lethal concentration required to kill 50% of the population (LC50) of the most promising strains. Ten strains of Bt toxic to lepidopteran proven in previous trials were used and these were incorporated into a natural diet with mahogany seeds to check their mortality. The LC50 of the top five strains was determined. The results indicate that H. grandella is highly susceptible to Bt toxins and the S1905 strain is highly toxic. Therefore, the use of Bt strains may be a tool to be incorporated into the integrated management of this important pest.
Źródło:: Journal of Plant Protection Research; 2018, 58, 1
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Anthropometric indicators of obesity in policemen: A systematic review of observational studies
Autorzy:: Da Silva, Franciele C.
Hernandez, Salma S.
Gonçalves, Elizandra
Arancibia, Beatriz A.
Da Silva Castro, Thiago L.
Da Silva, Rudney
Powiązania:: https://bibliotekanauki.pl/articles/2178909.pdf
Data publikacji:: 2014-12-01
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: obesity
police
systematic review
observational study
Opis:: The aim of this paper was to summarize scientific literature on obesity in policemen through a systematic review of observational studies. For this purpose the following electronic databases were selected: Medline by Pubmed, CINAHL, and Scopus; and a manual search of the referenced studies concerning this topic was performed. There were no restrictions with respect to the year or language of the publication. Twenty-three studies were identified and 9 articles, considered as potentially relevant, were included. The labor time, shift and career progression promoted changes in body composition. Most of the policemen taking part in the studies included in this paper were overweight (BMI: 25.2–29.3), obese (body fat ≥ 25%), had increased waist (90.4–102 cm) and abdominal perimeters (18.9–90.5 cm), and had a higher risk of chronic disease, which is associated with depression and stress development. Interventional studies are needed for the purpose of proposing preventive and rehabilitation programs, which would result in providing physical and mental well-being, improvement of life quality and, especially, prevention of obesity related to police work.
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2014, 27, 6; 891-901
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Naphthalic anhydride increases tolerance of common bean to herbicides
Autorzy:: Krenchinski, F.H.
Batista de Castro, E.
Cesto, V.J.S.
Belapart, D.
Rodrigues, D.M.
Carbonari, C.A.
Velini, E.D.
Powiązania:: https://bibliotekanauki.pl/articles/2084688.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electron transport
Phaseolus vulgaris
protection
safeners
Opis:: The aim of this work was to evaluate the use of the naphthalic anhydride safener on the protection of common bean cultivars BRS-Estilo (carioca) and BRS-Esplendor (black) from negative effects of herbicides. Two experiments were conducted, one for each cultivar in a complete randomized design with five replications, in a 6 × 3 factorial scheme, with six herbicide treatments: bentazon, fluazifop-P + fomesafen, bentazon + imazamox, fomesafen, cloransulam, and control without application, and three naphthalic anhydride treatments: without application, foliar application, and application via seed treatment. Visible injuries at 7, 14 and 21 days after application, photosystem II electron transport rate, and plant dry weight were evaluated. The naphthalic anhydride applied via foliar, and seed treatment reduced significantly the visible injuries in relation to the control when using the herbicides bentazon, fluazifop-P + fomesafen, bentazon + imazamox, and cloransulam. The photosystem II electron transport rate was protected by anhydride applied via foliar and seed treatment when using the herbicides bentazon, fluazifop-P + fomesafen and bentazon + + imazamox. The application of naphthalic anhydride via seed treatment protected the BRS-Estilo and BRS-Esplendor common bean cultivars, with no reductions in the plant dry weight when using the herbicides fluazifop-P + fomesafen, and fomesafen. The use of naphthalic anhydride via seed treatment and foliar application protected BRS-Estilo and BRSEsplendor common bean cultivars, from the negative effects of fluazifop-P + fomesafen and fomesafen herbicides. Thus, this practice has potential to be used in common beans.
Źródło:: Journal of Plant Protection Research; 2019, 59, 3; 383-391
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Aluminium Morphological Modification by Nitrogen-Argon Mixture PIII
Autorzy:: Muñoz-Castro, A.
López-Callejas, R.
Valencia Alvarado, R.
Peña-Eguiluz, R.
Mercado-Cabrera, A.
Barocio, S.
Rodríguez-Méndez, B.
de la Piedad-Beneitez, A.
Powiązania:: https://bibliotekanauki.pl/articles/1504099.pdf
Data publikacji:: 2011-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.40.Hf
52.77.Dq
81.65.-b
61.05.cp
62.20.Qp
68.37.Hk
Opis:: With incident fluences of ≈ $10^{12}$ atoms/$cm^2$ aluminium samples have been plasma immersion ion implanted with either pure nitrogen or argon/nitrogen mixtures at temperatures around 450°C. X-ray diffraction studies have validated the formation of the cubic phase of AlN, in samples treated with both the gas mixtures and pure nitrogen. Likewise, the presence of the hexagonal phase of AlN has been detected when either pure nitrogen or a 70%N/30%Ar mixture have been used. The signature peak of AlN has also been confirmed by the Raman spectroscopy. The maximal microhardness values were found in samples treated with the mixture. The maximal roughness was achieved with the equal part mixture in all cases, although increasing with the implantation pulse width up to a 300 nm peak at 150 μs. The latter critical value remains invariant under the pure nitrogen plasma treatment, provided that implantation periods in the order of 4.5 h are carried out.
Źródło:: Acta Physica Polonica A; 2011, 120, 1; 167-170
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Nitriding of 4140 Annealed Low Alloy Steel in RF Plasma
Autorzy:: de la Piedad-Beneitez, A.
Muñoz-Castro, A.
Valencia-Alvarado, R.
López-Callejas, R.
Mercado-Cabrera, A.
Peña-Eguiluz, R.
Rodriguez-Mendez, B.
Barocio, S.
Powiązania:: https://bibliotekanauki.pl/articles/1400469.pdf
Data publikacji:: 2013-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.77.Dq
52.80.Pi
62.20.Qp
81.40.Pq
81.70.Cv
Opis:: The annealed low alloy 4140 steel samples have been nitrided for different treatment periods (1-6 h) in an RF inductive plasma discharge with very low bias voltage ( ≈ 400 V). The resulting nitrided layer has been observed by means of an optical microscope whereas the nitride phases have been characterised by X-ray analysis. The corrosion response, assessed by the potentiodynamic tests in the 3.5% NaCl solution, presents both higher noble potential values and lower corrosion rates when compared with the untreated sample. The Vickers microhardness tests values show an appreciable increment compared to that of the untreated sample. The process is characterized by a high overall efficiency because similar average Vickers tests values were obtained, no matter for how long the treatment was extended. Likewise, the scanning electron micrographs confirmed no appreciable size evolution of the compound layer microstructure at different times of treatment.
Źródło:: Acta Physica Polonica A; 2013, 123, 5; 904-906
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: New concrete additive by chemical recycling of PET
Autorzy:: Mendivil-Escalante, J M
Almaral-Sánchez, J L
Gómez-Soberón, J M
Arredondo-Rea, S P
Corral-Higuera, R
Castro-Beltrán, A
Cabrera-Covarrubias, F G
Powiązania:: https://bibliotekanauki.pl/articles/102237.pdf
Data publikacji:: 2014
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: concrete admixture
glycolysis
polymeric resins
polyethylene terephthalate
Opis:: Due to the problem that represents the accelerated production of waste from the consumption of polyethylene terephthalate (PET), it becomes necessary to look for alternative solutions; chemical recycling is a suitable method for conversion into a material with potential application in concrete additive, such as unsaturated polyester resins; with the above improvements and conservation of non-renewable raw materials can reduce the environmental impact. This investigation was focused on obtaining the synthesis of a polymeric resin by the method of glycolysis, and their characterization by Infrared Spectroscopy (FT-IR); the results show that the recycled materials (PET and its processing) are similar to reagents made from primary materials so that it is considered feasible to use in the intended application.
Źródło:: Advances in Science and Technology. Research Journal; 2014, 8, 23; 1-5
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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