Temat: extraction - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Comparison of commonly used extraction methods for ergosterol in soil samples
Autorzy:: Sae-Tun, O.
Maftukhah, R.
Noller, C.
Remlinger, V.I.
Meyer-Laker, V.
Sorensen, A.C.T.
Sustic, D.
Socianu, S.I.
Bernardini, L.G.
Mentler, A.
Keiblinger, K.M.
Tematy:: soil
alkaline extraction
ergosterol extraction
glass bead beating
ultrasonication extraction; Pokaż więcej
Data publikacji:: 2020
Powiązania:: https://bibliotekanauki.pl/articles/2082954.pdf Link otwiera się w nowym oknie
Źródło:: International Agrophysics; 2020, 34, 4; 425-432
0236-8722
Pojawia się w:: International Agrophysics
Opis:: Concerning the contribution of fungi to soil carbon sequestration, various methods have been used to extract ergosterol from soil samples. This study aims to explore the extraction ability and applicability of commonly used methods to extract ergosterol from two contrasting soils. An agricultural soil (chernozem) and a forest soil (podzol) were extracted with different types of cell lysis such as alkaline, glass bead, and ultrasonication methods in association with simple shaking. The ergosterol concentration was measured by high pressure liquid chromatography. Regardless of the method applied, ergosterol yield was higher in podzol than in chernozem. Alkaline extraction resulted in the highest ergosterol concentrations for both soils and miniaturized glass bead extraction produced comparable results in the case of chernozem. In terms of applicability, the non-alkaline methods were simpler to conduct and less demanding of labour, chemical use and glassware and more flexible in terms of the equipment used for mechanical disruption. Despite the limit of the two soil types in the present study, only the simple shaking method was revealed to be dependent on soil type. Based on our results, we recommend the miniaturized glass bead method for agricultural soils, low in organic matter for high throughput. However, not all of the methods described allow for the proper separation of coextracted organic substances from organic-rich soil.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Separation of nickel and zinc ions in a synthetic acidic solution by solvent extraction using D2EHPA and Cyanex 272
Autorzy:: Gharabaghi, M.
Irannajad, M.
Azadmehr, A. R.
Tematy:: D2EHPA
Cyanex 272
nickel extraction
zinc extraction; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/110275.pdf Link otwiera się w nowym oknie
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 1; 233-242
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Opis:: Solvent extraction was used to recover nickel and zinc from synthetic acidic solution. Many leaching solution and waste waters contain both zinc and nickel at the same time. Bis (2,4,4trimethylpentyl) phosphinic acid (Cyanex 272) and Di(2-ethylhexyl) phosphoric acid (D2EHPA) were used to separate nickel and zinc. In the D2EHPA system, at equilibrium pH of 2, zinc extraction was more than 98% whereas nickel extraction was only 0.36%. The extraction of metals was found to increase with an increase of pH of the aqueous phase. At equilibrium pH 3.5, zinc extraction was completed and higher than 99% zinc was extracted using Cyanex 272. The maximum nickel extractions using D2EHPA and Cyanex 272 were achieved at equilibrium pH 4.5 and 7.5, respectively. Both extractants showed the relatively good separation levels between nickel and zinc. D2EHPA and Cyanex 272 isotherms for single metal solutions showed that the extraction order was Zn2+>Ni2+. ΔpH1/2 value showed that the separation of nickel and zinc using Cyanex 272 was simpler than D2EHPA system. The stripping study was performed using sulphuric acid and it was shown that above 98% zinc and nickel could be extracted. These results demonstrated separation of zinc and nickel from sulphate solutions to be favorable.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The model of mineral extraction by the underground leaching method with taking into account non-homogeneity of initial mineral distribution [abstract]
Autorzy:: Tungatarova, M.
Kaltayev, A.
Nagy, S.
Tematy:: eksploatacja
mineral extraction; Pokaż więcej
Data publikacji:: 2007
Powiązania:: https://bibliotekanauki.pl/articles/300039.pdf Link otwiera się w nowym oknie
Źródło:: Wiertnictwo, Nafta, Gaz; 2007, 24, 1; 55-56
1507-0042
Pojawia się w:: Wiertnictwo, Nafta, Gaz
Opis:: The underground leaching method or method of In-Situ Leaching (ISL) is used at the low concentrated mineral deposits exploitation. The underground leaching method is distinguished by high ecological safety and profitability in comparison with the traditional method of production. In-situ leaching is a method for development of ore deposits without lifting the ore to the surface by selective transfer of ions of natural uranium into productive solution in subsurface. This method is performed by drilling of wells through mineral ore bodies, supply of solution into mineral ore bodies, lifting of mineral containing solutions to the surface and extraction of mineral in sorption ion-exchanging units, addition of acid into mother solutions and injection into subsurface. Thus, the method of in-situ leaching, without exaggeration, is the most economical and ecologically safe method of production compared with all other known methods. The problems dealing with the increasing of mineral's excavation rate and the optimal wells locations arise at minerals extraction by ULM. The mineral's excavation rate depends on the types of wells location, the distribution of minerals in layer, the structure of layers and deposit's exploitation conditions. In this work the influence of wells location on mineral's extraction rate is investigated. The study of liquid filtration in layer and dissolution of salt are based on the Darcy's law and one-step chemistry model of dissolution. In addition, the leaching processes in the layer (porous media) is simulated using conservation equations of mass and species. The computer models of mineral extraction by the method of In-Situ Leaching with taking into account of layer's anisotropy and non-homogeneity initial mineral distribution are elaborated in given work.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The IBA self-extracting cyclotron project
Autorzy:: Kleeven, W.
Lucas, S.
Delvaux, J.
Swoboda, F.
Zaremba, S.
Beeckman, W.
Vandeplassche, D.
Abs, M.
Tematy:: cyclotron
extraction
radioisotopes; Pokaż więcej
Data publikacji:: 2003
Powiązania:: https://bibliotekanauki.pl/articles/148721.pdf Link otwiera się w nowym oknie
Źródło:: Nukleonika; 2003, 48,suppl.2; 59-67
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Opis:: The self-extracting cyclotron is a high-intensity 14 MeV H+ machine for isotope production. There is no electrostatic deflector. Extraction is achieved with a special shaping of the magnetic field. There are two long poles and two short poles, both with an elliptical gap profile; this provides a steep fall off of the magnetic field at the pole radii. An extraction groove is machined in the iron of one of the longer poles. First harmonic coils create a large orbit separation at the entrance of the extraction path and extract the beam. The machine is presently installed in the industrial isotope production site where the final commissioning and tests took place. Beams of more than 1.5 mA have been extracted and transported. Further development is ongoing in order to increase the current on target to at least 2 mA in the coming months. Commercial isotope production will start in the course of this year. The concept of the machine is explained and the layout of the machine and beam lines is presented. Results of orbit calculations and central region optimizations are given. Results of the measurement of extracted beam shapes and emittances are given. The progress and present status of the project are discussed.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Intelligent Recognition of Colour and Contour from Ancient Chinese Embroidery Images
Autorzy:: Ju, Fei
Wang, Qiang
Tan, Zhenke
Li, Quan
Tematy:: Chinese ancient embroidery
colour level adjustment
sharpening
contour extraction
colour extraction; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2172004.pdf Link otwiera się w nowym oknie
Źródło:: Fibres & Textiles in Eastern Europe; 2022, 3 (151); 79--92
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Opis:: Ancient Chinese embroidery is an important intangible part of the cultural heritage of mankind. Its colours and contours are a major source of oriental inspiration and design elements for designers today. This study presents an effective intelligent recognition of colour and contour based on K-means++ clustering and the Canny operator for colour and contour application of ancient Chinese embroidery images and for digital inheritance and innovation. First, digital cameras and portable scanners were used in embroidery image acquisition. Second, colour level adjustment, sharpening and smoothing were specially added to the preprocessing, because of the ancient embroidery age or colour errors caused by the shooting angle. Third, K-means++ clustering was used for colour clustering. Fourth, the Canny operator was used for contour detection. After the addition of colour level adjustment and sharpening in the preprocessing, the colours and contours could be acquired accurately and more effectively from embroidery images and be read and edited independently.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Niekonwencjonalne metody ekstrakcji : ekstrakcja ekologiczna
Unconventional methods of extractions : green extraction
Autorzy:: Nowosad, Karolina
Sujka, Monika
Tematy:: ekstrakcja ekologiczna
ekstrakcja płynem nadkrytycznym
ekstrakcja za pomocą ultradźwięków
ekstrakcja za pomocą pulsacyjnego pola elektrycznego
ekstrakcja za pomocą enzymów
green extraction
extraction with supercritical fluid
extraction using ultrasound
extraction using a pulsed electric field
extraction using enzymes; Pokaż więcej
Data publikacji:: 2019
Powiązania:: https://bibliotekanauki.pl/articles/972309.pdf Link otwiera się w nowym oknie
Źródło:: Wiadomości Chemiczne; 2019, 73, 9-10; 465-479
0043-5104
2300-0295
Pojawia się w:: Wiadomości Chemiczne
Opis:: Extraction is a method of extracting a chemical from a solution or mixture of solid substances. Conventional methods of extraction, for example, Soxhlet method, require the use of hazardous solvents, are time-consuming and cause degradation of the extracted compounds. Green extraction is characterized by the speed, it gives a quantitative recovery of the extract and does not cause degradation of the components. It takes place at a lower energy consumption than conventional extraction. A number of novel alternatives to conventional extraction techniques have been proposed, including ultrasonic assisted extraction (UAE), supercritical fluid extraction (SFE), enzyme extraction or pulsed electric field. These techniques allow to reduce or eliminate the use of toxic solvents, improve process efficiency and extract quality. The temperature of the above-mentioned processes is low, which affects the behavior of temperature-sensitive substances. The widely used "green extraction" is SFE - extraction with supercritical fluid. The solvent is a supercritical fluid, most often carbon dioxide. Ultrasonic extraction is environmentally friendly, easy to use, versatile and relatively cheap compared to other innovative techniques. This technique can be used to extract, for example, polysaccharides, essential oils, proteins, peptides, dyes, pigments and bioactive substances. Extraction with the use of pulsed electric field is used to extract mainly polyphenols and other bioactive components. Extraction with enzymes (mainly pectinases, cellulases and hemicellulases) is widely used in the food industry, eg for clarifying beer and juices. The extraction yield depends on the solvent system, temperature, enzyme function, substrate availability and pH.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Ontology-Based Information Extraction: Current Approaches
Autorzy:: Białek, M.
Tematy:: Ontology-Based Information Extraction
Information Extraction
semantic web
ontology
Knowledge
Representation; Pokaż więcej
Data publikacji:: 2010
Powiązania:: https://bibliotekanauki.pl/articles/115891.pdf Link otwiera się w nowym oknie
Źródło:: Challenges of Modern Technology; 2010, 1, 1; 69-75
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Opis:: The purpose of Information Extraction (IE) is extracting information from unstructured, or semi structured machine readable documents by automatic means. Generally this means dealing with human language texts using natural language processing (NLP) techniques. Recently on the market of IE systems a new player emerged. Ontology-Based IE (OBIE) idea consequently gains more and more supporters. In this approach a crucial role in the IE process is played by ontology (formal representation of the knowledge by a set of concepts within a domain and the relationships between those concepts). Using Ontology as one of the IE tools makes OBIE very convenient approach for gathering information that can be later on used in construction of Semantic Web. In this paper I will explain the idea of OBIE with its fl aws and advantages. I will try not only to provide theoretical approach, but also to review current trends in this fi eld. This will be done to point out some common architecture in currently used systems and in the end classify them based on diff erent factors depending on their usability in real life application. As a conclusion an attempt to identify possible trends and directions in this fi eld will be made.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Copper recovery from chalcopyrite concentrate acid leach solutions by Acorga M5397
Autorzy:: El Amari, K.
Jdid, E.-A.
Blazy, P.
Tematy:: copper solvent extraction
solvent extraction selectivity
nitro-fluorosilic acid
AcorgaM5397; Pokaż więcej
Data publikacji:: 2013
Powiązania:: https://bibliotekanauki.pl/articles/110601.pdf Link otwiera się w nowym oknie
Źródło:: Physicochemical Problems of Mineral Processing; 2013, 49, 1; 329-339
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Opis:: Chalcopyrite concentrate from Hajar Mine, Morocco, was leached with nitro-fluosilicic acid leach solution. The pregnant leach solution obtained contained 19.3 g/dm3 Cu, 18.1 g/dm3 Fe, 4.5 g/dm3 Zn and 0.03 g/dm3 Pb. Copper recovery from this pregnant leach liquor was performed by solvent extrac-tion using Acorga M5397 diluted in Escaid 110. McCabe–Thiele distribution isotherms showed that at pH 1.7 complete and selective copper extraction can be achieved with φo/φa =1.5/1 in 3 stages of extraction. Stripping of the loaded copper by treating the organic phases by a fresh sulphuric acid solution was easily realized.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Zasady proekologicznej zrywki drewna w warunkach gospodarki lesnej w gorach
Autorzy:: Sosnowski, J.
Tematy:: zrywka drewna
lasy gorskie
zrywka proekologiczna
lesnictwo
timber extraction
proecological extraction
mountains; Pokaż więcej
Data publikacji:: 2003
Powiązania:: https://bibliotekanauki.pl/articles/1026678.pdf Link otwiera się w nowym oknie
Źródło:: Sylwan; 2003, 147, 05; 58-64
0039-7660
Pojawia się w:: Sylwan
Opis:: The paper concentrates on the problems connected with timber extraction in difficult mountain conditions. The use of extraction machines has to be in line with the requirements of the multifunctional forest management. It has been underlined that the analysis of the conditions (site, stand, technical infrastructure) in the area where proecological (least harmful) timber extraction is to be carried out is done prior to such an undertaking.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Effect of Mg Ratio on the Extraction of Dy from (Nd,Dy)-Fe-B Permanent Magnet Using Liquid Mg
Autorzy:: Park, Sang-Min
Nam, Sun-Woo
Cho, Ju-Young
Lee, Sang-Hoon
Hyun, Seung-Keun
Kim, Taek-Soo
Tematy:: dysprosium
liquid metal extraction
(Nd,Dy)-Fe-B magnet
extraction behavior
diffusion; Pokaż więcej
Data publikacji:: 2020
Powiązania:: https://bibliotekanauki.pl/articles/353657.pdf Link otwiera się w nowym oknie
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1281-1285
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Opis:: Recently, since the demand of rare earth permanent magnet for high temperature applications such as an electric motor has increased, dysprosium (Dy), a heavy rare earth element, is becoming important due to severe bias in its production. To fulfillthe increasing need of Dy, recycling offers as a promising alternative. In recycling of rare earths, Hydro-metallurgical extraction method is mainly used however it has adverse environmental effects. Liquid metal extraction on the other hand, is an eco-friendly and simple method as far as the reduction of rare earth metal oxide is concerned. Therefore, liquid metal extraction was studied in this research as an alternative to the hydro-metallurgical recycling method. Magnesium (Mg) is selected as solvent metal because it doesn’t form intermetallic compounds with Fe, B and has a low melting and low boiling point. Extraction behavior of Dy in (Nd,Dy)-Fe-B magnet is observed and effect of Mg ratio on extraction of Dy is confirmed.
Dostawca treści:: Biblioteka Nauki

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