Using New Technology Material to Make Inclusion Sheet

2021 ◽  
Vol 1026 ◽  
pp. 183-188
Author(s):  
Liu Yang ◽  
Liu Shuang
Keyword(s):  
Low Temperature ◽  
Fluid Inclusion ◽  
Ph Value ◽  
New Technology ◽  
Temperature Environment ◽  
Chemical Conditions ◽  
Slice Method ◽  
Physical And Chemical ◽  
Technological Methods ◽  
Made In

The research of fluid inclusion thin section is to understand the physical and chemical conditions (such as temperature, pressure, density, pH value, composition, etc.) of minerals, rocks and deposits, and to solve the genesis of rocks and deposits; in the process of production, gas inclusions or liquid inclusions should be produced at low temperature, otherwise the inclusions will be destroyed, especially quartz sandstone, weathered rock, mudstone and other minerals Therefore, when the film is made in a humid temperature environment, it is very easy to be deliquesced, especially for the rocks with developed cleavage and many cracks, after rough grinding after polishing, it is easy to produce warping edge, warping angle, bubbles, etc., thus causing the sample piece to deteriorate after polishing; therefore, a large number of pockmarks and cracks will be produced under the microscope. In this paper, starting from the applicable conditions of materials and technological methods, the practical problems of making materials and technological process in rock slice method are introduced in detail. Keywords Inclusion,Manufacturing, Grinding,Polishing,Filming

scholarly journals AVALIAÇÃO PRELIMINAR DAS CONDIÇÕES HIDROGEOLÓGICAS NA ÁREA DO MUNICÍPIO DE OURO PRETO, MG.

2013 ◽  
Author(s):  
Quênia de Cássia Goulart Ferreira ◽  
Luis de Almeida Prado Bacellar
Keyword(s):  
Crystalline Basement ◽  
Primary Data ◽  
Inorganic Elements ◽  
Aquifer System ◽  
Aquifer Systems ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
The City ◽  
Iron Formations ◽  
Made In

O conhecimento da dinâmica natural e da qualidade das águas subterrâneas no município de Ouro Preto éainda deficiente. Em vista disto, foi elaborado um banco de dados hidrogeológicos com o intuito de avaliarde forma preliminar o potencial hídrico subterrâneo desta área. A análise e tratamento dos dados secundáriose primários obtidos permitiu a identificação de oito sistemas aqüíferos. O sistema do Grupo Itabira, ondese encontram as formações ferríferas da Formação Cauê, é o de maior potencial. Os sistemas em rochasdo embasamento cristalino destacam-se pelo maior número de poços tubulares cadastrados. Análises deparâmetros físico-químicos e de elementos inorgânicos na água subterrânea revelaram que a maioria apresentaconcentrações inferiores aos máximos permitidos pela legislação para água potável. Contudo, como o sistemade proteção sanitária dos poços se mostrou muitas vezes inadequado, é possível que haja alguma contaminaçãopor elementos ou compostos não analisados e que deverão ser futuramente investigados.Palavras-chaves: hidrogeologia, sistemas aqüíferos, hidroquímica, Ouro Preto. ABSTRACT: The knowledge of physical and chemical conditions of groundwater in the city of Ouro Preto is still deficient.Therefore, in this paper a hydrogeological database was made, in order to estimate the groundwater potentialof the area. The analysis and processing of secondary and primary data allowed the identification of eightaquifer systems. The aquifer system of the Itabira Group, with iron formations, was considered the best,while the crystalline basement system has the highest number of registered wells. Analysis of physicalchemicalparameters and inorganic elements in groundwater has revealed that most concentrations are belowthe maximum allowed by law for drinking water. owever, the sanitary protection of the wells is frequentlyinadequate and there are ossibly other contaminants, which should be further investigated.Keywords: hydrogeology, aquifer systems, hydrochemistry, Ouro Preto.

scholarly journals Re-Os dating, and Pb-H-O isotope characteristics, of the Abra Cu-Ag-Pb-Au polymetallic deposit in Western Australia

2021 ◽  
Author(s):  
Chaozhuang Xi ◽  
Minghong Zheng ◽  
Ling He ◽  
Haodong Xia
Keyword(s):  
Low Temperature ◽  
Western Australia ◽  
Atmospheric Precipitation ◽  
Low Salinity ◽  
Polymetallic Deposit ◽  
Metallogenic Belt ◽  
Copper Gold ◽  
Value Range ◽  
Chemical Conditions ◽  
Physical And Chemical

AbstractThe Abra deposit, a large lead-silver-copper–gold polymetallic deposit in Western Australia, is located at the eastern of the metallogenic belt of the Jillawarra basin in the Bangemall basin. The 4th to the 6th rock section of the Irrigully Group of Edmund Series are the principal ore-host strata, composed mainly of sandstone and fine sandstone. The orebody in Abra can be classified into two types as upper layer-like lead-silver and lower veins or netvein copper–gold. The metal minerals are mainly galena, chalcopyrite, and pyrite, while the gangue minerals are mainly quartz, dolomite, and barite. Both Re-Os isotopic age of the pyrite (1329.5 ± 98 Ma) with the initial (187Os/188Os) = 5.0 ± 3.8 and Pb isotopic compositions (206Pb/204Pb = 15.914–15.967, 207Pb/204Pb = 15.425–15.454, 208Pb/204Pb = 35.584–35.667) suggests that the metal minerals were sourced from the wall-rocks. δDV-SMOW values of quartz range from -35‰ to -17‰ whereas δ18OV-SMOW value range from 12‰ to 16‰ which indicates that the ore-forming fluids of Abra were medium–low temperature and medium–low salinity, and were mainly metamorphic water and secondary atmospheric precipitation. When the medium–low temperature ore-forming fluids are mixed with oxidizing reducing fluids carrying a large number of metal substances, a large number of ore-forming substances will be precipitated when the physical and chemical conditions change, thus it can be considered that the Abra deposit is a medium–low temperature hydrothermal polymetallic deposit.

scholarly journals Physico-chemical conditions of existence of early Cambrian chemotrophic microbiota in zone of influence of ore-forming hydrothermal solutions

2019 ◽  
Vol 486 (3) ◽  
pp. 331-335
Author(s):  
V. A. Simonov ◽  
A. A. Terleev ◽  
A. V. Kotlyarov ◽  
D. A. Tokarev ◽  
A. V. Kanygin
Keyword(s):  
Low Temperature ◽  
Hydrothermal Systems ◽  
Early Cambrian ◽  
Hydrothermal Solutions ◽  
Ore Body ◽  
Physico Chemical ◽  
Zone Of Influence ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
Operating Zone

Complex researches of the pyrite Early Cambrian Kyzyl-Tashtyg deposit (East Tuva) have allowed to reconstruct paleohydrothermal systems, to find out physical and chemical conditions of hydrothermal processes, and also to establish features of existence of ancient hydrothermal biota in the operating zone of the solutions, participating at all stages of formation of ore-bearing structures, since influence of postmagmatic fluids and finishing low temperature hydrotherms. The representative data on biota has been received at studying of the objects, which were in a zone of influence of rather low temperature hydrothermal systems. In one cases findings of microorganisms are dated for basalt complexes, containing ore body, and in other cases the found fauna is connected with ferruginous-siliceous sediments. It has been found out that microorganisms in the tonsil cavities of basalts evolved at the temperatures nearby 110-140°С under the influence of hydrothermal solutions. Much lower temperatures (to 100 °С) existed at development of micro-fossils in the quartz-hematite hydrothermal constructions of Kyzyl-Tashtyg deposit.

scholarly journals Spontaneous Serpentine Carbonation Controlled by Underground Dynamic Microclimate at the Montecastelli Copper Mine, Italy

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 1 ◽  
Author(s):  
Chiara Boschi ◽  
Federica Bedini ◽  
Ilaria Baneschi ◽  
Andrea Rielli ◽  
Lukas Baumgartner ◽  
...  
Keyword(s):  
Low Temperature ◽  
Mine Water ◽  
Geochemical Modeling ◽  
High Reactivity ◽  
Condensation Process ◽  
Copper Mine ◽  
Fine Grained ◽  
Evaporation And Condensation ◽  
Chemical Conditions ◽  
Physical And Chemical

Understanding low temperature carbon sequestration through serpentinite–H2O–CO2 interaction is becoming increasingly important as it is considered a potential approach for carbon storage required to offset anthropogenic CO2 emissions. In this study, we present new insights into spontaneous CO2 mineral sequestration through the formation of hydromagnesite + kerolite with minor aragonite incrustations on serpentinite walls of the Montecastelli copper mine located in Southern Tuscany, Italy. On the basis of field, petrological, and geochemical observations coupled with geochemical modeling, we show that precipitation of the wall coating paragenesis is driven by a sequential evaporation and condensation process starting from meteoric waters which emerge from fractures into the mine walls and ceiling. A direct precipitation of the coating paragenesis is not compatible with the chemical composition of the mine water. Instead, geochemical modeling shows that its formation can be explained through evaporation of mine water and its progressive condensation onto the mine walls, where a layer of serpentinite powder was accumulated during the excavation of the mine adits. Condensed water produces a homogeneous film on the mine walls where it can interact with the serpentinite powder and become enriched in Mg, Si, and minor Ca, which are necessary for the precipitation of the observed coating paragenesis. The evaporation and condensation processes are driven by changes in the air flow inside the mine, which in turns are driven by seasonal changes of the outside temperature. The presence of “kerolite”, a Mg-silicate, is indicative of the dissolution of Si-rich minerals, such as serpentine, through the water–powder interaction on the mine walls at low temperature (~17.0 to 18.1 °C). The spontaneous carbonation of serpentine at low temperature is a peculiar feature of this occurrence, which has only rarely been observed in ultramafic outcrops exposed on the Earth’s surface, where instead hydromagnesite predominantly forms through the dissolution of brucite. The high reactivity of serpentine observed, in this study, is most likely due to the presence of fine-grained serpentine fines in the mine walls. Further study of the peculiar conditions of underground environments hosted in Mg-rich lithologies, such as that of the Montecastelli Copper mine, can lead to a better understanding of the physical and chemical conditions necessary to enhance serpentine carbonation at ambient temperature.

scholarly journals Estrategias modernas para la conservación de forrajes en sistemas de producción bovina tropical

2005 ◽  
Vol 6 (2) ◽  
pp. 69 ◽  
Author(s):  
Leonardo Sánchez Matta
Keyword(s):  
Nutritional Quality ◽  
Production Systems ◽  
Climatic Variation ◽  
Seasonal Effects ◽  
Manual Labour ◽  
Animal Growth ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
Made In

<p>Los sistemas de producción bovina en Colombia emplean el pastoreo de especies forrajeras para la alimentación básicamente porque este sistema demanda menor uso de mano de obra. No obstante, la dependencia de las praderas de pastoreo tiene como desventajas los efectos de las variaciones climáticas y las condiciones químicas y físicas del suelo que ocasionan considerables reducciones en la disponibilidad y calidad nutricional del forraje; este efecto se denomina 'estacionalidad forrajera' y acompaña las épocas secas, lo cual impacta negativamente las tasas de crecimiento animal y su producción,  además de reducir la carga animal. Por otra parte, durante las épocas de lluvias se presentan excedentes de forrajes que no se conservan o se ofrecen en estados avanzados de madurez, lo que afecta su calidad nutricional y la productividad. Si bien ha habido avances en las prácticas de conservación de forrajes, es necesario intensificar estos procesos así como desarrollar otras alternativas, como los forrajes resistentes a la sequía, para enfrentar los efectos adversos de la estacionalidad. En este artículo se revisan algunas estrategias y tecnologías disponibles para optimizar los procesos fermentativos que aseguren la calidad del producto ensilado, altos niveles de consumo y una alta productividad animal.</p><p> </p><p><strong>Modern strategies for conserving forage in tropical bovine production systems</strong></p><p>Colombian bovine production systems basically employ grazing on pasture forages since as this is an economic system involving little manual labour.  However, dependence on pasture for grazing carries with it the disadvantages of the effects of climatic variation and a particular soil's physical and chemical conditions. Significant reductions in the availability and quality of forage thus occur during the dry season an effect known as the 'seasonal nature of fodder', leading to reducing animal load production levels and animal growth rates. Conversely, there is a surplus of forage during the rainy season which is not preserved or is offered in an advanced state of maturity; this also affects its nutritional quality and therefore productivity. Some progress has been made in the practice of conserving forage; however, such processes must be intensified and altematives developed using drought-resistant materials, thereby counteracting the seasonal effects determined by climatic variation. Current strategies and/or technologies must thus be reviewed as they have a direct effect on the process and/or type of fermentation leading to maintaining and/or improving product quality or ensuring that it is preserved for ensuring high levels of consurnption and animal productivity.</p>

ЦИФРОВОЙ ИЗОЛЯТОР В СПЕЦИАЛИЗИРОВАННОМ КОРПУСЕ, ВЫПОЛНЕННОМ ПО ТЕХНОЛОГИИ LTCC

2020 ◽  
Vol 96 (3s) ◽  
pp. 392-395
Author(s):  
В.А. Бутузов ◽  
А.Е. Назаренко ◽  
Н.Ю. Дмитриев ◽  
В.А. Трофимов ◽  
В.А. Косевский ◽  
...  
Keyword(s):  
Low Temperature ◽  
Data Rate ◽  
Test Results ◽  
Made In

Представлены результаты разработки цифрового изолятора на основе интегрального микротрансформатора в специализированном корпусе, выполненном по технологии низкотемпературной совместно обжигаемой керамики (LTCC). Согласно результатам измерений тестовых образцов максимальная скорость передачи данных разработанного цифрового изолятора - не менее 30 Мбит/с. The paper presents the results of the development of a digital insulator based on an integral microtransformer in a specialized package made in technology of low-temperature co-fired ceramics. The isolator is a microassembly consisting of a transceiver chip and an integrated transformer. According to the test results, the maximum data rate speed of the developed digital insulator is not less than 30 Mbit/s.

Permeability to albumin in isolated coronary venules

1993 ◽  
Vol 265 (2) ◽  
pp. H543-H552 ◽  
Author(s):  
Y. Yuan ◽  
W. M. Chilian ◽  
H. J. Granger ◽  
D. C. Zawieja
Keyword(s):  
Permeability Coefficient ◽  
Filtration Rate ◽  
Intraluminal Pressure ◽  
Apparent Permeability ◽  
Filtration Pressure ◽  
Diffusive Permeability ◽  
Apparent Permeability Coefficient ◽  
Chemical Conditions ◽  
Physical And Chemical ◽  
Intravascular Pressure

This study reports measurements of albumin permeability in isolated coronary venules. The isolated microvessel technique allows the quantification of transmural exchange of macromolecules under tightly controlled physical and chemical conditions. Transvenular exchange of albumin was studied in isolated coronary venules during alterations in filtration rate caused by changes in intravascular pressure. The apparent permeability coefficient of albumin (Pa) at an intraluminal pressure of 11 cmH2O was 3.92 +/- 0.43 x 10(-6) cm/s. Elevating intraluminal pressure to 16 and 21 cmH2O increased Pa to 5.13 +/- 0.57 x 10(-6) and 6.78 +/- 0.66 x 10(-6) cm/s, respectively. Calculation of the true diffusive permeability coefficient of albumin (Pd) at zero filtration rate was 1.54 x 10(-6) cm/s. The product of hydraulic conductance (Lp) and (1 - sigma), where sigma is the solute reflection coefficient, was 3.25 x 10(-7) cm.s-1 x cmH2O-1. At a net filtration pressure of 4-5 cmH2O, diffusion accounts for > 60% of total albumin transport across the venular wall. Transmural albumin flux is very sensitive to filtration rate, rising 6.7% for each cmH2O elevation of net filtration pressure. At 11 cmH2O net filtration pressure, convection accounts for nearly 70% of net albumin extravasation from the venular lumen. We suggest that the isolated coronary venule is a suitable preparation for the study of solute exchange in the heart.

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

scholarly journals Origin of Life on Mars: Suitability and Opportunities

Life ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 539
Author(s):  
Benton C. Clark ◽  
Vera M. Kolb ◽  
Andrew Steele ◽  
Christopher H. House ◽  
Nina L. Lanza ◽  
...  
Keyword(s):  
Origin Of Life ◽  
Energy Sources ◽  
Early Earth ◽  
Sediment Samples ◽  
Life On Mars ◽  
Eventual Return ◽  
History Of ◽  
Early Mars ◽  
Chemical Conditions ◽  
Physical And Chemical

Although the habitability of early Mars is now well established, its suitability for conditions favorable to an independent origin of life (OoL) has been less certain. With continued exploration, evidence has mounted for a widespread diversity of physical and chemical conditions on Mars that mimic those variously hypothesized as settings in which life first arose on Earth. Mars has also provided water, energy sources, CHNOPS elements, critical catalytic transition metal elements, as well as B, Mg, Ca, Na and K, all of which are elements associated with life as we know it. With its highly favorable sulfur abundance and land/ocean ratio, early wet Mars remains a prime candidate for its own OoL, in many respects superior to Earth. The relatively well-preserved ancient surface of planet Mars helps inform the range of possible analogous conditions during the now-obliterated history of early Earth. Continued exploration of Mars also contributes to the understanding of the opportunities for settings enabling an OoL on exoplanets. Favoring geochemical sediment samples for eventual return to Earth will enhance assessments of the likelihood of a Martian OoL.

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