ABOUT EFFICIENCY OF INDIVIDUAL PROTECTION EQUIPMENT OF RESPIRATORY ORGANS AS PROPHYLACTICS OF DISEASES (REVIEW)

2018 ◽  
pp. 2-6 ◽  
Author(s):  
V. A. Kaptsov ◽  
A. V. Chirkin
Keyword(s):  
Respiratory Protection ◽  
Ability To Work ◽  
Individual Protection ◽  
High Degree ◽  
Degree Of Purification

The review of publications evaluating the effectiveness of personal respiratory protection (RPE) as means of reducing morbidity (occupational and morbidity with temporary loss of ability to work) and indicators of the degree of purification of the inhaled air is presented. It is revealed that with a high degree of probability, systematic studies in this field were not carried out and that in some cases the effectiveness was overestimated by incorrect justification.

Reduction o Air Pollution from Fine Dust by Increasing Efficiency of Gas Emission Purification Sintering Furnaces

2021 ◽  
Vol 25 (12) ◽  
pp. 4-9
Author(s):  
E.V. Kiryushin ◽  
O.V. Pilyaeva ◽  
I.I. Shepelev ◽  
E.N. Eskova
Keyword(s):  
Air Pollution ◽  
Gas Purification ◽  
Fine Dust ◽  
Gas Emission ◽  
Atmospheric Air ◽  
Gas Cleaning ◽  
Waste Gas ◽  
Purification Unit ◽  
High Degree ◽  
Degree Of Purification

The installation of an additional stage of the "wet" waste gas purification unit at the alumina sintering furnaces ensured the achievement of a high degree of purification of gas emissions from fine impurities up to 96 % and the standards of maximum permissible emissions of solid pollutants into the atmosphere established for an industrial enterprise. The formed slude after gas cleaning is proposed to be sent for further processing to the hydrochemistry workshop, thereby ensuring its disposal without contamination of the natural environment. The analysis of air pollution indicators confirmed a decrease in emissions of solid pollutants in the atmospheric air of Achinsk.

scholarly journals Separation of Contaminants in The Freeze/Thaw Process

2017 ◽  
Vol 38 (2) ◽  
pp. 249-264 ◽  
Author(s):  
Janusz A. Szpaczyński ◽  
Jeffrey A. White ◽  
Caroline L. Côté
Keyword(s):  
High Efficiency ◽  
Solid Particles ◽  
Liquid Volume ◽  
Freezing And Thawing ◽  
Repeated Freezing ◽  
Clay Slurry ◽  
Thawing Processes ◽  
High Degree ◽  
Degree Of Purification ◽  
Significant Concentration

AbstractThese studies examined the concept of concentration and purification of several types of wastewater by freezing and thawing. The experiments demonstrated that freezing of contaminated liquid contributed to concentration of contaminants in solution as well as significant concentration and agglomeration of solid particles. A high degree of purification was achieved for many parameters. The results of comparative laboratory tests for single and multiple freezing are presented. It was found that there was a higher degree of concentration of pollutants in wastewater frozen as man-made snow than in bulk ice. Furthermore, the hypothesis that long storage time of liquid as snow and sufficient temperature gradient metamorphism allows for high efficiency of the concentration process was confirmed. It was reported that the first 30% of the melted liquid volume contained over 90% of all impurities. It gives great opportunities to use this method to concentrate pollutants. The results revealed that the application of this process in full scale is possible. Significant agglomeration of solid particles was also noted. Tests with clay slurry showed that repeated freezing and thawing processes significantly improve the characteristics of slurry for sedimentation and filtration.

IMPROVEMENT OF ELECTROSTATIC FILTRATION AIR OF INDUSTRIAL SPACES OF AGRIBUSINESS

2020 ◽  
Vol 18 (4) ◽  
pp. 117-123
Author(s):  
S.A. Dobrin ◽  
◽  
S.Yu. Shubkin ◽  
S.S. Buneev ◽  
S.V. Eletskikh ◽  
...  
Keyword(s):  
Aerosol Particles ◽  
Operating Principle ◽  
Fine Dust ◽  
Cleaning Efficiency ◽  
Food Industries ◽  
Clean Technologies ◽  
High Degree ◽  
Degree Of Purification

The aim of the study was to develop a promising filtering device for cleaning industrial premises from fine dust of aerosol particles, providing increased cleaning efficiency and safety. A high degree of purification is guaranteed by electrostatic filters of the order of 90-95%. However, they also have a number of disadvantages that require improvements in the operating principle and design. In connection with the development of "clean" technologies in medicine, in the electronic and food industries, this direction of research is relevant.

VI.—Note on the Lakes of Zurich and Wallen

1893 ◽  
Vol 10 (5) ◽  
pp. 222-225
Author(s):  
C. S. Du Riche Preller
Keyword(s):  
Drainage Area ◽  
High Degree ◽  
Degree Of Purification

In the course of the summer 1892, I had occasion to visit and examine the drainage area of the Lake of Zurich, including that of the Wallensee; and this gave rise to some interesting observations relating more especially to the origin of those lakes, to the high degree of purification of their waters by chemical and mechanical agency, and to some noteworthy effects of certain geological changes in their watersheds.

scholarly journals Calculation and Development of the Device for Determining the Beginning, End and Extremum of Peak at the Output of the Adsorption Unit

2019 ◽  
Vol 9 (2) ◽  
pp. 3908-3910
Keyword(s):  
Electrical Energy ◽  
Direct Conversion ◽  
General Purpose ◽  
Necessary Condition ◽  
Test Substance ◽  
Analog To Digital ◽  
Distillation Columns ◽  
Pure Substances ◽  
High Degree ◽  
Degree Of Purification

It is known that the solution of such fundamental problems as the direct conversion of thermal and solar energy into electrical energy, the creation of superconducting materials, thermally stable materials and the development of the nanotechnology industry is directly dependent on the solution to the problem of obtaining highly pure substances. In practice, purification systems such as distillation columns, centrifugebased devices, surface tension-based devices and adsorptionbased devices are used to purify substances from impurities. The development of technology currently predisposes to the use of adsorption separation of the method in the analysis of multicomponent mixtures in many industries and the national economy and is gradually taking the place of traditional chemical and physico-chemical methods. The production of highly pure substances with a percentage of microimpurities less than 10-6% is possible only when using an adsorption unit with a large number of columns used. In industrial production, the number of columns in this installation is from 5000 to 10000 pieces. In this case, the signals coming from the adsorption unit in the form of a peak described by the Gauss function characterize the percentage of the test substance and to automate this process, the necessary condition is the use of devices for processing this signal. The efficiency of adsorption methods is significantly increased due to the automation of data processing at the output of the adsorption installation, which develops mainly in three directions: the use of universal general purpose personal computers for processing, the use of specialized computing devices. In general, the automation process involves pairing the adsorption unit with a personal computer, and to achieve this, it is necessary to use such devices for processing signals at the output of the adsorption unit as amplifiers, analog-to-digital converters, and a device for determining the beginning and end of the peak. This article is devoted to the calculation and development of a device for determining the beginning and end of a peak at the output of an adsorption tube. The developed device can be used in the production of high-purity silicon. Having available silicon of high degree of purification there is a possibility of production of such electronic devices as-the diode, the transistor, chips and other various semiconductor devices which essentially differ on the qualitative indicators. Along with this, the use of materials with a high degree of purification gives ample opportunities to improve the quality of manufacturing solar cells and LEDs of increased power.

225Ac/213Bi generator based on inorganic sorbents

2019 ◽  
Vol 107 (12) ◽  
pp. 1203-1211 ◽  
Author(s):  
Aleksandr N. Vasiliev ◽  
Stanislav V. Ermolaev ◽  
Elena V. Lapshina ◽  
Boris L. Zhuikov ◽  
Nikolay D. Betenekov
Keyword(s):  
Processing Time ◽  
High Yield ◽  
Inorganic Sorbent ◽  
Inverse Generator ◽  
High Degree ◽  
Degree Of Purification

Abstract A scheme of an “inverse” generator based on an inorganic sorbent (annealed zirconium and yttrium mixture oxides) has been proposed and tested. The generator demonstrated high yield of the 213Bi product (up to 97 % in 0.5 mL of eluate), high degree of purification from the actinium isotopes (up to 10−2 % of initial 225Ac in 3 M NaNO3 solution), as well as the products of 227Ac decay, and low radiation impact on the sorbent. Application of circulating approach to the sorption of 213Bi provides decreasing processing time to 5 min at higher yield of the product.

scholarly journals Prospects and Development of Research of Composite Elastomer Materials

2021 ◽  
Vol 14 (4) ◽  
pp. 464-476
Author(s):  
Bekhzod B. Yoqubov ◽  
◽  
Akhmadjon Ibadullaev ◽  
Dilnora Q. Yoqubova ◽  
Elmira U. Teshabaeva ◽  
...  
Keyword(s):  
Functional Groups ◽  
Interfacial Interaction ◽  
Paramagnetic State ◽  
Rubber Compounds ◽  
Elastomeric Materials ◽  
Temperature Exposure ◽  
Mineral Fillers ◽  
High Degree ◽  
Degree Of Purification ◽  
Rubber Filler

The aim of this work is to study the effect of new modified ingredients on the complex of properties of composite elastomeric materials. It was found that the introduction of modified ingredients into the composition of elastomeric compositions enhances interfacial interaction at the «rubber-filler» interface and the formation of additional bonds between rubber macromolecules and functional groups, as a result of which an improvement in the complex of properties of the compositions is observed. The introduction of modified carbon into the composition of elastomeric compositions enhances interfacial interaction at the «rubber-filler» interface and the formation of additional bonds between rubber macromolecules and functional groups of the oligomer, as a result of which an improvement in the complex of properties of the compositions is observed. The technology of purification of mineral fillers from metal oxides has been developed. A sufficiently high degree of purification by this method is due to the fact that in the process of temperature exposure at 950 K, iron ions from the paramagnetic state (d-form Fe2O3) pass into ferromagnetic (r-form Fe3O4). Feasibility and prospects of using modified fillers, both mineral and organic, in the formulations of rubber compounds for the production of various types of rubber products

Tissue section lifting for electron microscopy

1978 ◽  
Vol 36 (2) ◽  
pp. 86-87
Author(s):  
Adrian F. van Dellen
Keyword(s):  
Infectious Disease ◽  
Electron Microscopy ◽  
Tissue Culture ◽  
Organ System ◽  
Surrounding Tissue ◽  
Paraffin Sections ◽  
Surface Areas ◽  
Specific Determination ◽  
High Degree ◽  
Accuracy And Repeatability

The morphologic pathologist may require information on the ultrastructure of a non-specific lesion seen under the light microscope before he can make a specific determination. Such lesions, when caused by infectious disease agents, may be sparsely distributed in any organ system. Tissue culture systems, too, may only have widely dispersed foci suitable for ultrastructural study. In these situations, when only a few, small foci in large tissue areas are useful for electron microscopy, it is advantageous to employ a methodology which rapidly selects a single tissue focus that is expected to yield beneficial ultrastructural data from amongst the surrounding tissue. This is in essence what "LIFTING" accomplishes. We have developed LIFTING to a high degree of accuracy and repeatability utilizing the Microlift (Fig 1), and have successfully applied it to tissue culture monolayers, histologic paraffin sections, and tissue blocks with large surface areas that had been initially fixed for either light or electron microscopy.

Electron Microscopy in Molecular Biology

1967 ◽  
Vol 25 ◽  
pp. 2-3
Author(s):  
Cecil E. Hall
Keyword(s):  
Electron Microscopy ◽  
Molecular Biology ◽  
Noise Level ◽  
Molecular Structures ◽  
Material Structure ◽  
The Arts ◽  
Shadow Casting ◽  
Electron Image ◽  
High Degree ◽  
Very High

The visualization of organic macromolecules such as proteins, nucleic acids, viruses and virus components has reached its high degree of effectiveness owing to refinements and reliability of instruments and to the invention of methods for enhancing the structure of these materials within the electron image. The latter techniques have been most important because what can be seen depends upon the molecular and atomic character of the object as modified which is rarely evident in the pristine material. Structure may thus be displayed by the arts of positive and negative staining, shadow casting, replication and other techniques. Enhancement of contrast, which delineates bounds of isolated macromolecules has been effected progressively over the years as illustrated in Figs. 1, 2, 3 and 4 by these methods. We now look to the future wondering what other visions are waiting to be seen. The instrument designers will need to exact from the arts of fabrication the performance that theory has prescribed as well as methods for phase and interference contrast with explorations of the potentialities of very high and very low voltages. Chemistry must play an increasingly important part in future progress by providing specific stain molecules of high visibility, substrates of vanishing “noise” level and means for preservation of molecular structures that usually exist in a solvated condition.

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