scholarly journals OBTAINING CLINKERLESS CEMENTS THROUGH THE SYNTHESIS OF BASIC SOLUTIONS OF SODIUM SILICATE FROM SILICA-CONTAINING ROCKS

2019 ◽  
Vol 46 (3) ◽  
pp. 149-158
Author(s):  
M. Sh. Salamanova ◽  
S.-A. Yu. Murtazaev ◽  
Z. H. Ismailova ◽  
R. G. Bisultanov
Keyword(s):  
Atmospheric Pressure ◽  
Active Role ◽  
Important Research ◽  
Alkaline Metals ◽  
Technical Parameters ◽  
High Dispersal ◽  
Research Task ◽  
Basic Solutions ◽  
High Temperature Processing ◽  
Insoluble Compounds

 Objectives The creation of clinkerless cements that do not require high-temperature processing and significant natural resources, at the same time as exhibiting good technical parameters, seems to be an important research task. Cements of alkaline instillation, in which alkaline metals play an active role, are capable of interacting with minerals of aluminosilicate nature forming strong and insoluble compounds.Methods Concrete composites from binding substances activated by alkaline were developed on the basis of Russian and foreign experience of using cinder slag composites in construction.Results In this work, energy-dispersion microanalysis of the developed clinkerless compositions based on alkaline silicate sodium solutions from silica-containing rocks was carried out.Conclusion Formulations of clinkerless cements based on high-dispersal powders of different natures mixed by the alkaline solution obtained using the wet technique at temperatures of up to 95 °C and atmospheric pressure are proposed. This technology will expand the use of alkaline cements, thus leading to the development of concrete having desired properties. 

scholarly journals PREPARATION OF LIQUID-GLASS SILICATE-SODIUM ALKALINE SOLUTIONS FROM SILICON-CONTAINING ADDITIVES

2019 ◽  
Author(s):  
С.-А. Муртазаев ◽  
М.Ш. Саламанова
Keyword(s):  
Alkaline Solution ◽  
Atmospheric Pressure ◽  
Liquid Glass ◽  
Active Component ◽  
Energy Dispersive ◽  
Alkaline Solutions ◽  
Alkaline Metals ◽  
Highly Dispersed ◽  
Energy Dispersive Microanalysis ◽  
Insoluble Compounds

В основу получения бетонных композитов на вяжущих щелочной активации положен отечественный и зарубежный опыт применения шлакощелочных композитов в строительстве. В данной работе проведен энергодисперсионный микроанализ исследуемых бесклинкерных композиций на основе щелочных силикат натриевых растворов из кремнеземсодержащих горных пород. Разработанные рецептуры бесклинкерных вяжущих на основе высокодисперсных порошков различной природы, затворенных щелочным раствором, приготовленным мокрым способом при температурах до 950С и атмосферном давлении. Данная технология позволит расширить область применения щелочных цементов и получать бетоны с заданными свойствами. Работа выполнена в рамках исследований по реализации научного проекта 1848200001 Высококачественные бетоны с повышенными эксплуатационными свойствами на основе местного природного и техногенного сырья , получившего поддержку Российского фонда фундаментальных исследований (РФФИ). Alkaline mixing cements in which the alkaline metals will be the active component can interact with aluminosilicate minerals during hydration to form strong and insoluble compounds. The basis for the production of concrete composites on alkaline binding binders is based on domestic and foreign experience in the use of slag base composites in construction. In this work, an energy dispersive microanalysis of the clinkerfree compositions under study based on alkaline silicate sodium solutions from silicacontaining rocks was carried out. Developed formulations of clinkerless binders on the basis of highly dispersed powders of various nature, closed with an alkaline solution prepared by the wet method at temperatures up to 95 C and atmospheric pressure. This technology will allow you to expand the scope of alkaline cements and get concretes with desired properties.

Analogues of the active and inactive sodium carbonate

1982 ◽  
Vol 47 (12) ◽  
pp. 3348-3361 ◽  
Author(s):  
Erich Lippert ◽  
Karel Mocek ◽  
Emerich Erdös
Keyword(s):  
Thermal Decomposition ◽  
Time Dependence ◽  
Water Vapour ◽  
Sulphur Dioxide ◽  
Atmospheric Pressure ◽  
Flow Reactor ◽  
Kinetic Measurements ◽  
Sodium Potassium ◽  
Alkaline Metals ◽  
Hydrogen Carbonates

The reactivity of the anhydrous carbonates of alkaline metals with sulphur dioxide has been studied experimentally in dependence both on the nature of the cation and on the way of preparation of the anhydrous carbonate. The carbonates were prepared either by thermal decomposition of hydrogen carbonates or by thermal dehydration of carbonate hydrates. The carbonates of lithium, sodium, potassium, rubidium and caesium have been investigated. Kinetic measurements were carried out in a flow reactor in the integral regime at 423 K under atmospheric pressure, with a gas containing 0.2 vol.% of sulphur dioxide and 2.0 vol.% of water vapour in the nitrogen as a carrier gas. The reactivities have been compared on the basis of time dependence of the conversion of carbonate to sulphite.

scholarly journals Influence of vacuumetric pressure on thermal properties of high-temperature radioactive graphite-nitrogen system

2021 ◽  
Vol 2119 (1) ◽  
pp. 012095
Author(s):  
M R Shavaleev ◽  
N M Barbin ◽  
D I Terentyev ◽  
S I Osipenko ◽  
D S Belkin
Keyword(s):  
Thermal Properties ◽  
High Temperature ◽  
Atmospheric Pressure ◽  
Thermodynamic Data ◽  
Nitrogen Atmosphere ◽  
Vacuum Pressure ◽  
Radioactive Graphite ◽  
Reactor Graphite ◽  
High Temperature Processing

Abstract To improve and specify the method proposed by the authors for high-temperature processing of reactor graphite in a nitrogen atmosphere, the thermodynamic data of the formed nitride compounds are supplemented and the system is calculated at a vacuum pressure of 0.5 atm. The data obtained are compared with the values at atmospheric pressure.

scholarly journals Influence of Pressure Equalisation Elements on the Quality of Insulating Glass Units

2018 ◽  
Vol 1 (1) ◽  
pp. 48-54
Author(s):  
Zbigniew Respondek
Keyword(s):  
Thermal Properties ◽  
Thermal Insulation ◽  
Atmospheric Pressure ◽  
Pressure Level ◽  
Extreme Pressure ◽  
Glass Pane ◽  
Continuous Increase ◽  
Technical Parameters ◽  
Reasonable Solution

Abstract Continuous increase of expectations concerning improvement in quality of building partitions by means of increasing their thermal insulation properties brings, among others, a need of modification in standards that have been applied to the double glazed windows so far. Triple-glazed and quadruple-glazed IGUs are used more and more often. Such elements have better thermal properties, but they are more prone to deflection and stress resulting from climatic load, i.e. changes in temperature, atmospheric pressure and wind load. Due to the above certain concepts occurred that consist in equalising gas pressure in the gas-filled gaps with the atmospheric pressure. The article contains assessment of such solutions in the context of providing suitable technical parameters of glass panes: thermal insulation and susceptibility to climatic load. It was stated that the pressure-equalizing elements (capillaries) can result in a significant reduction in the quality of the glass partition in the event of the argon purging chamber or damage to the low-E emissions. The lower risk of using required thermal properties occurs when periodically active valves are used, they operate only in case of extreme pressure level differences. Further analysis concerned the idea of pressure equalisation between the gaps of a triple-glazed unit, as that can be done by using an edge spacer of appropriate design. On the basis of comparative analysis of static values it was shown that it is a reasonable solution. Such a unit maintains the properties of a tight unit, while the possibility of gas exchange between the gaps leads to relief of the central glass pane in the unit, thus allowing for decreasing its thickness to 2 mm.

scholarly journals Search for anomalies in pulse flows of acoustic and electromagnetic emissions

2020 ◽  
Vol 196 ◽  
pp. 03006
Author(s):  
Yury Senkevich
Keyword(s):  
Electromagnetic Emission ◽  
Structural Features ◽  
Seismic Events ◽  
Important Research ◽  
Near Surface ◽  
Kamchatka Region ◽  
Research Task ◽  
Electromagnetic Emissions ◽  
Pulse Streams ◽  
Timely Warning

Timely warning of disasters caused by earthquakes ensures life safety. Therefore, the search for markers of pre-seismic events preceding earthquakes remains an important research task. The article presents experimental methods for assessing seismic activity in the Kamchatka region based on the results of processing and analysis of geoacoustic and electromagnetic emission signals. The research is aimed at detecting anomalies in quantitative and qualitative indicators that characterize the pulse streams of acoustic emission of near-surface rocks and electromagnetic emission in the surface layer of the atmosphere. Signal processing and analysis are carried out using special algorithms that take into account the structural features of the variety of pulse shapes and their distribution over time.

Construction of a lower body negative pressure chamber

2007 ◽  
Vol 31 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Ben T. A. Esch ◽  
Jessica M. Scott ◽  
Darren E. R. Warburton
Keyword(s):  
Negative Pressure ◽  
Atmospheric Pressure ◽  
Lower Body Negative Pressure ◽  
Physiological Responses ◽  
Pressure Chamber ◽  
Orthostatic Tolerance ◽  
Lower Body ◽  
Important Research ◽  
Gravitational Stress ◽  
Design Plan

Lower body negative pressure (LBNP) is an established and important technique used to physiologically stress the human body, particularly the cardiovascular system. LBNP is most often used to simulate gravitational stress, but it has also been used to simulate hemorrhage, alter preload, and manipulate baroreceptors. During experimentation, the consequences of LBNP and the reflex increases in heart rate and blood pressure can be manipulated and observed in a well-controlled manner, thus making LBNP an important research tool. Numerous laboratories have developed LBNP devices for use in research settings, and a few devices are commercially available. However, it is often difficult for new users to find adequately described design plans. Furthermore, many available plans require sophisticated and expensive materials and/or technical support. Therefore, we have created an affordable design plan for a LBNP chamber. The purpose of this article was to share our design template with others. In particular, we hope that this information will be of use in academic and research settings. Our pressure chamber has been stress tested to 100 mmHg below atmospheric pressure and has been used successfully to test orthostatic tolerance and physiological responses to −50 mmHg.

A hand–eye calibration algorithm based on screw motions

Robotica ◽  
2009 ◽  
Vol 27 (2) ◽  
pp. 217-223 ◽  
Author(s):  
Zijian Zhao ◽  
Yuncai Liu
Keyword(s):  
Computer Vision ◽  
Linear Equations ◽  
High Accuracy ◽  
Robotic Hand ◽  
Important Research ◽  
Research Task ◽  
Screw Motions ◽  
Calibration Algorithm ◽  
Vision Technique ◽  
Computer Vision Technique

SUMMARYWhen computer vision technique is used in robotics, robotic hand–eye calibration is a very important research task. Many algorithms have been proposed for hand–eye calibration. Based on these algorithms, we introduce a new hand–eye calibration algorithm in this paper, which employs the screw motion theory to establish a hand–eye matrix equation by using quaternion and gets a simultaneous result for rotation and translation by solving linear equations. The algorithm proposed in this paper has high accuracy and stable computational efficiency and can be understood easily. Both simulations and real experiments show the superiority of our algorithm over the comparative algorithms.

scholarly journals Funeral and Memorial Rites of Mishar Tatars of the Republic of Mordovia

Islamovedenie ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 83-94
Author(s):  
Agishev Ruslan Ryafatevich ◽  
◽  
Barinova Olga Nikolaevna ◽  
Irina Vladimirovna Manaeva
Keyword(s):  
20Th Century ◽  
21St Century ◽  
Distinctive Feature ◽  
Ritual Practice ◽  
Important Research ◽  
Funeral Rites ◽  
Research Task ◽  
The Republic ◽  
Muslim Communities

In Muslim communities of contemporary Russia, the processes of re-Islamization are ac-tively taking place, leading to the transformation of traditional ritual. The study of the ongoing changes (usually accompanied by the disappearance of ethnic rituals) is an important research task. The article examines the funeral rites of Mishar Tatars of the Republic of Mordovia – their content and transformations. The analysis shows that in the territory of the region in the second half of the 20th century there was a syncretic tradition of carrying out funeral rites of the Mishar Tatars. The funeral and memorial combination included rituals and elements of rituals of a non-Islamic nature, borrowed from other religious, ethnic, cultural and ideological systems. At the beginning of the 21st century, the process of bringing the burial and memorial rites of Mishar Tatars of the Republic of Mordovia to Islamic canon was intensified. A distinctive feature of the process was the exclusion from the ritual practice of all rites and elements of rites that do not correspond to Muslim canons.

scholarly journals Poland in the Period of Economic Transition and Germany After Reunification an Attempt at Assessing Σ-Convergence

2010 ◽  
Vol 17 (2) ◽  
pp. 71-94
Author(s):  
Marta Götz
Keyword(s):  
Regional Differences ◽  
Economic Transition ◽  
Important Research ◽  
Berlin Wall ◽  
Preliminary Results ◽  
Research Task ◽  
The Eu

In 2009 and 2010 Poland and Germany are celebrating some important anniversaries – 20 years of the first free elections and the fall of the Berlin Wall. These jubilees inspire research aiming at taking stock of developments having unfolded over this time. Since the economic cohesion is high on the EU agenda, examining international and interregional differences seems an important research task. This article aims at evaluating and comparing σ-convergence (diminishing discrepancies of GDP p.c.) in Poland (1995–2005) and Germany (1992–2006) on three NUTS levels. Preliminary results point to inequalities regularly diminishing in Germany, however, growing in Poland. A tentative reasoning suggests that increasing values of regional differences observed in Poland might be a temporary phenomenon.

Personalized Web Information Recommendation Based on Data Mining

2011 ◽  
Vol 225-226 ◽  
pp. 546-549 ◽  
Author(s):  
Bo He
Keyword(s):  
Data Mining ◽  
Recommendation System ◽  
Experimental Results ◽  
User Profiles ◽  
Important Research ◽  
Web Information ◽  
Research Task ◽  
Information Recommendation ◽  
Recommendation Strategy

Personalized web information recommendation service had becoming an important research task increasingly as the time goes by. This paper established user profiles and put forward a recommendation strategy. On the base of these, the paper designed a personalized web information recommendation system based on data mining, namely, PWIRS. The experimental results indicate that the recommendation strategy of PWIRS is feasible.

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