scholarly journals Supergene gold transformation in technogenic mineral formations

2019 ◽  
Vol 98 ◽  
pp. 01028
Author(s):  
Alfiia Khusainova ◽  
Vladimir Naumov ◽  
Oksana Naumova
Keyword(s):  
Chemical Composition ◽  
Mine Wastes ◽  
Supergene Zone ◽  
Physical Chemical ◽  
Solid Phases

This article is about the research on gold obtained from mine wastes and other technogenic mineral formations. The authors investigated how solid phases of gold in supergene zone transform from various deposits. Results show the following supergene gold transformations by various physical, chemical, biological and mechanical processes occurring in the wastes. Transformations result in changes in morphology and chemical composition, and special redistribution of gold in wastes.

Pathways and Mechanisms for Removal of Dissolved Organic Carbon from Leaf Leachate in Streams

1981 ◽  
Vol 38 (1) ◽  
pp. 68-76 ◽  
Author(s):  
Clifford N. Dahm
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Clay Minerals ◽  
Iron Oxides ◽  
Amorphous Solid ◽  
Microbial Utilization ◽  
Physical Chemical ◽  
Fine Particulate ◽  
Solid Phases ◽  
Aluminum And Iron Oxides

Removal of dissolved organic carbon (DOC) from water resulting from adsorption and microbial uptake was examined to determine the importance of biotic and abiotic pathways. Physical–chemical adsorption to components of the stream sediment or water and biotic assimilation associated with the microbial population was determined in recirculating chambers utilizing leachate from alder (Alnus rubra). Adsorptive mechanisms were further separated into interactions involving (1) specific clay minerals, (2) amorphous solid phases of hydrous aluminum and iron oxides, and (3) fine particulate organic matter. Physical–chemical adsorptive mechanisms for alder leachate removal exhibited rapid kinetic equilibration between the DOC and solid phases, but only a specific fraction of the DOC, likely containing certain chemical functional groups, was adsorbed. The amorphous aluminum and iron oxides possessed a much higher potential capacity than the clay minerals or fine particulate organics for DOC adsorption. Microbial uptake of DOC from the alder leachate was kinetically slower than adsorptive uptake. However, microbial activity was overall much more effective in the removal and degradation of the total DOC pool leached from alder leaves. Over a 48-h period, 97% of added 14C labeled leachate was removed from solution by adsorption (~ 20%) and microbial utilization (~ 77%). The rate of microbial uptake was 45 μg C/g sediment C∙h−1 or 14 mg C∙m−2∙h−1.

scholarly journals Effect of pretreatment and enzymatic hydrolysis on the physical-chemical composition and morphologic structure of sugarcane bagasse and sugarcane straw

2016 ◽  
Vol 219 ◽  
pp. 773-777 ◽  
Author(s):  
Marcia Maria de Souza Moretti ◽  
Olavo Micali Perrone ◽  
Christiane da Costa Carreira Nunes ◽  
Sebastião Taboga ◽  
Maurício Boscolo ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Enzymatic Hydrolysis ◽  
Sugarcane Bagasse ◽  
Sugarcane Straw ◽  
Physical Chemical

scholarly journals Unified analytical algorithm for identification of component composition of winemaking products

2021 ◽  
pp. 58-75
Author(s):  
A. Kolesnov ◽  
S. Tsimbalaev ◽  
V. Ivlev ◽  
V. Vassiliev ◽  
F. Lamerdonova
Keyword(s):  
Chemical Composition ◽  
Component Composition ◽  
Scientific Data ◽  
National Standard ◽  
Technological Factors ◽  
Physical Chemical ◽  
Foreign Countries ◽  
Analytical Algorithm ◽  
Composition Of Products

The article discusses a unified analytical algorithm for identification of component composition of winemaking products, established in the new national standard GOST R 59570-2021 «Winemaking products. Identification of component in terms of determination of the origin of ethanol and other compounds of physical-chemical composition». The standard provides modern scientific data on winemaking products, as well as data on natural, agrotechnical and technological factors that can impact the component composition of products to interpret the results of analytical evaluations. The article provides practical examples of use of analytical methods established in the standard for the study of winemaking products produced in Russia, Kazakhstan, Armenia and foreign countries.

ChemInform Abstract: An Overview of Characteristics of Municipal Solid Waste Fuel in China: Physical, Chemical Composition and Heating Value

ChemInform ◽  
2015 ◽  
Vol 46 (30) ◽  
pp. no-no
Author(s):  
Hui Zhou ◽  
Ai Hong Meng ◽  
Yan Qiu Long ◽  
Qing Hai Li ◽  
Yan Guo Zhang
Keyword(s):  
Chemical Composition ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Heating Value ◽  
Physical Chemical

scholarly journals Review of Different Materials that can be CAD/CAM Processed Description, chemical composition, indications in dentistry areas

2019 ◽  
Vol 70 (11) ◽  
pp. 4029-4034
Author(s):  
Daniela Popa ◽  
Mariana Constantiniuc ◽  
Kamel Earar ◽  
Veronica Mercut ◽  
Monica Scrieciu ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Glass Ceramics ◽  
Chemical Properties ◽  
Restorative Dentistry ◽  
Physical Chemical ◽  
Cad Cam ◽  
Materials Used ◽  
Cam Systems ◽  
The Ideal ◽  
Design And Production

The objective of this paper is to inform on the indications, appearance and advantages offered by each category of materials used in CAD / CAM technique for different prosthetic restorations.Modern techniques in restorative dentistry include CAD/CAM systems and materials that can be CAD/CAM processed. It is very important to know the physical-chemical properties and the indications of these materials to translate the patient�s wishes to reality providing the ideal restoration. There are a variety of CAD/CAM materials to choose from, all designed to provide efficient restoration design and production. We can choose from available materiales including glass ceramics, nano ceramics, zirconia, hybrid ceramics, BioHPP, in blocks or disks form.

scholarly journals Barra de cereal proteica a base de quinoa e amendoim enriquecido com frutooli-gossacarídeo

2020 ◽  
Vol 1 (49) ◽  
pp. 106
Author(s):  
Naiara Menezes Bezerra ◽  
Wênia Maria Vieira Cosmo ◽  
Edsania Princelânia Xavier Nézio ◽  
Laiza Oliveira Pessoa ◽  
Dalany Menezes Oliveira ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Food Industry ◽  
Functional Foods ◽  
Nutritional Content ◽  
High Protein Content ◽  
Tukey Test ◽  
Physical Chemical ◽  
High Lipid ◽  
Nutritional Characteristics ◽  
Binding Agents

<p class="Normal1">The food industry has sought to adapt to the trend of healthy consumption habits and, for this, it has invested in the research and production of products with functional purposes, since functional foods have proven to bring several health benefits. Therefore, it was proposed, with this research, the elaboration of a functional bar, rich in functional and protein ingredients, taking into account the nutritional content and its practicality of consumption. For this, varied proportions of quinoa (10%, 17% and 15%, for F1, F2 and F3, respectively) and peanuts (20%, 15% and 17%, for F1, F2 and F3, respectively), were used, and the functional bars were enriched with fructooligosaccharide (FOS), with a ratio between dry ingredients and binding agents of 70% and 30%, respectively. The design of the binary mixture was used for the various compositions of formulations. Analysis of variance (ANOVA) was applied to evaluate the physical-chemical composition and its average in relation to the Tukey test at 5% confidence. The three formulations were considered to have a high protein content (21.54%, for F1; 18.17%, for F2; 20.00%, for F3), according to legislation, with a high lipid content (22.02%, for F1; 13.42%, for F2; 22.40%, for F3), coming from good sources, and considerable carbohydrate content (49.62%, for F1; 54.44%, for F2; 47.84% , for F3), including fibers. The proposed functional bar proved to be balanced in nutrients and calories, presenting nutritional characteristics compatible with a diet rich in proteins.</p>

scholarly journals Impact of Accelerated Carbonation on Microstructure and Phase Assemblage

2018 ◽  
Vol 59 (1) ◽  
pp. 111-126 ◽  
Author(s):  
Andres Belda Revert ◽  
Klaartje De Weerdt ◽  
Ulla Hjorth Jakobsen ◽  
Mette Rica Geiker
Keyword(s):  
Chemical Composition ◽  
Cold Water ◽  
Pore Solution ◽  
Phase Assemblage ◽  
Accelerated Carbonation ◽  
Natural Conditions ◽  
Point Analysis ◽  
Solid Phases ◽  
Natural Carbonation

Abstract The paper summarizes preliminary results on characterization of the microstructure and phase assemblage of mortar and concrete samples containing Portland and Portland-fly ash cement carbonated at either natural conditions, 60% RH and 1% CO2, 90% RH and 5% CO2 or 60% RH and 100% CO2. Different characterization techniques were used: thermogravimetric analysis to study the solid phases, SEM-EDS point analysis to investigate the chemical composition of the solid phases, optical microscopy to investigate the microstructure, and cold water extraction to characterize the chemical composition of the pore solution. The combined results on microstructure and phase assemblage indicate that carbonation up to 5% CO2 appears representative for natural carbonation. Pore solution analysis revealed similar trends for the three accelerated carbonation conditions.

ZEBU COW’S MILK: ASSOCIATION OF PHYSICAL-CHEMICAL COMPOSITION WITH ELECTRICAL CONDUCTIVITY AND SOMATIC CELL COUNT

2021 ◽  
pp. 194-205
Author(s):  
Emmanuella de Oliveira Moura Araújo ◽  
José Geraldo Bezerra Galvão Júnior ◽  
Guilherme Ferreira da Costa Lima ◽  
Stela Antas Urbano ◽  
Adriano Henrique do Nascimento Rangel
Keyword(s):  
Electrical Conductivity ◽  
Chemical Composition ◽  
Somatic Cell ◽  
Cell Count ◽  
Somatic Cell Count ◽  
Cow’S Milk ◽  
Cow's Milk ◽  
Physical Chemical
Sign in / Sign up

Export Citation Format

Share Document