Physiological and hygienic substantiation of development of a technique of an estimation of overalls for protection working in the heating environment on indicators of a thermal condition

2019 ◽  
pp. 1013-1019 ◽  
Author(s):  
O. V. Burmistrova ◽  
T. K. Losik ◽  
E. S. Shuporin
Keyword(s):  
Thermal State ◽  
Experimental Studies ◽  
The Body ◽  
Labor Process ◽  
Physical Work ◽  
Vapor Permeability ◽  
New Materials ◽  
Protective Properties ◽  
Heat And Moisture ◽  
Made In

Sanitary and hygienic assessment of overalls for workers in a heating environment is currently carried out only on the physical, mechanical and hygienic properties of the materials from which it is made, not taking into account the effect of clothing on the thermal state of the human body and its heat and moisture exchange with the environment. Th e results of studies of the thermal and functional state of a person performing physical work in a heating environment showed differences in the formation of the thermal load on the body depending on the air temperature and the type of workwear used to protect against production hazards, as well as the significance of the thermophysical parameters of the materials (air permeability, vapor permeability, hygroscopicity) of which it is made. In addition, the development and manufacture of new materials with special protective properties, including using nanotechnology, expanding their assortment for the manufacture of workwear dictates the need to test their protective properties not only at the stands, but also in finished products in experimental studies involving humans. Th erefore, it is urgent to develop a methodology for evaluating workwear according to indicators of a person’s thermal state, which allows determining the degree of influence of the whole complex of environmental factors, labor process and workwear on the thermal state of people working in a heating environment in order to predict it and establish the work schedule in relation to specific conditions. Th e technique is intended for organizations involved in the design and development of workwear used in a heating environment, as well as materials for its manufacture; for testing laboratories performing sanitary-hygienic assessment of personal protective equipment.

FEATURES OF THE HUMANS’ THERMAL STATE WHEN USING A PERSONAL PROTECTIVE EQUIPMENT AGAINST POWER-FREQUENCY ELECTRIC FIELDS

2021 ◽  
Author(s):  
M.V. Gusarova ◽  
◽  
I.S. Malakhova ◽  
O.V. Burmistrova
Keyword(s):  
Electric Fields ◽  
Thermal Load ◽  
Thermal State ◽  
Negative Impact ◽  
The Body ◽  
Physical Work ◽  
Hot Environment ◽  
Before And After ◽  
Power Frequency ◽  
The Impact

Abstract. Introduction. When using personal protective equipment (PPE) against power-frequency electric fields (PFEF), there is a problem associated with the deterioration of the humans thermal state during a workshift when working in a hot environment. The shielding and shunting elements of the PPE increase the weight of the PPE and has an additional thermal load on a person working in a hot environment and so have a negative impact on his thermal state. The change in the indicators of the persons’ thermal state can be considered as a criteria for the impact of a complex of factors that determine the body heat exchange with the environment. Also, in addition to the impact of the PFEF and the hot environment, workers are exposed to physical exertion associated with moving around the area and lifting weights, which additionally burdens their functional state. Purpose. To study the thermal state of a person using PPE from the PFEF, when performing physical work at different thermal load levels of the environment. Materials and methods. Four practically healthy men were involved as volunteers. Before and after the experiment, the initial skin temperature indicators were recorded in 11 areas of the body surface as well as the tympanic membrane temperature and the heart rate (HR). During physical activity and rest, subjective heat and humidity sensations were also recorded every 5 minutes on the 11 areas of the body surface and the temperature of the inner surface of the clothing was determined. Before and after the experiment, the body weight of the naked volunteer and the weight of all the items included in the PPE kit were recorded. Results and discussion. During physical work at WBGT 28.0°C, ΔQts reached the permissible level (2.6 kJ/kg) after 10 minutes from the start of the work, and when working in WBGT 23.3°C – after 20 minutes, which indicated the highest rate of overheating of the human body at a higher level of the thermal load. The moisture sensitivity score at WBGT of 28.0°C by the end of the working period was 3.3. Stabilization of the HR was observed at a lower level of the thermal load, but at WBGT 28.0°C there was a HR continuous increase, which indicates a greater tension of the thermoregulation mechanisms. Conclusion. The obtained data allowed us to establish the fact of the negative impact of the use of EP-4(0) kits on the humans’ thermal state. When using the EP-4(0), it is necessary to regulate the time of continuous work in the open air: no more than 2 hours with a subsequent rest for at least 30 minutes in order to compensate heat loss as a result of using such PPE, which hinders heat and moisture exchange.

Experimental estimation of the temperature regime of the model reservoir with a protective wall type "glass in glass" under fire conditions

2020 ◽  
Vol 90 ◽  
pp. 32-48
Author(s):  
D. N. Rubtsov ◽  
◽  
A. N. Egorov ◽  
Keyword(s):  
Temperature Measurement ◽  
Experimental Research ◽  
Thermal State ◽  
Experimental Studies ◽  
Heating Time ◽  
The Body ◽  
Steel Shell ◽  
Contact Method ◽  
Fire Tests ◽  
Wall Model

Introduction. The publication contains a description and results of a series of fire tests of a model of a "glass in a glass" oil product tank, obtained inter alia using the method of contact temperature measurement. The paper presents the formulation of the problem of experimental research, the conditions and methods for their implementation, a description of the instrumental base and the results obtained. The aims and goals. An experimental study is carried out to assess the effect of heat loads of a fire on the body of the protective wall in the event of a fire in the main tank as well as for further use of the obtained empirical dependences of the temperature of the body of the protective wall on the heating time for carrying out the verification procedure of the mathematical model for its adequacy to the investigated physical process. Methodology. Experimental research method, contact method of temperature measurement, observation, analysis, generalization. The results of the study. The paper presents the results of experimental studies on the basis of which empirical dependences were obtained for calculating the change in the temperature values of the protective wall model depending on the time of its heating. Fire tests made it possible to establish the general thermal state of the "main reservoir with oil product – protective wall" system. The contribution of the influence of different speeds of wind flows on the heating of the protective wall of the reservoir is determined. Conclusion. The data obtained in the experiments will be used for the numerical assessment of the stress-strain state of the steel shell of the tank protective wall in case of fire in the main tank, which is necessary for the design of fire-fighting systems for water sprinkling and foam fire extinguishing on the protective wall of the tank of the "glass in glass" type. Key words: protective wall, model, oil product, fire tests, fire, tank, stand, thermocouple, experiment.

Features of the thermal state of medical workers when using personal protective equipment against biological factors

2020 ◽  
Vol 60 (11) ◽  
pp. 801-803
Author(s):  
Alexey V. Konyukhov ◽  
Andrey M. Geregei ◽  
Vladislav I. Lemeshko
Keyword(s):  
Personal Protective Equipment ◽  
Thermal State ◽  
Medical Personnel ◽  
The Body ◽  
Vapor Permeability ◽  
Protective Equipment ◽  
Biological Factors ◽  
Coronavirus Infection ◽  
Working Day ◽  
Materials Used

Introduction. Biological personal protective equipment (PPE) is currently in particular demand, primarily when working with patients with a new coronavirus infection (COVID-19). Many materials used in the manufacture of such PPE have low air and vapor permeability, which ultimately can contribute to overheating of the body even in a comfortable temperature environment. The aim of study - physiological and hygienic assessment of the thermal state of the body of medical workers dressed in PPE from biological factors during the working day. Materials and methods. The study was conducted on the basis of an infectious hospital clinic of the FSBSI "Izmerov Research Institute of Occupational Health" during the COVID-19 epidemic on practically healthy volunteers: orderlies, nurses and doctors, who during the study performed their duties in the "infectious" zone. Results. The volunteers were equipped with sensors that measure the temperature of the skin and body, heart rate and humidity of the underwear. The indicators obtained during the experiment were evaluated in accordance with the current regulatory documentation. Conclusion. The data obtained as a result of the study showed an increase in most of the criteria indicators of the thermal state of the body of medical workers, which made it possible to assess the intensity of the thermal state of medical personnel.

Experimental studies of new design solutions for the fencing of refrigerated car and container bodies

2020 ◽  
Vol 17 (4) ◽  
pp. 498-513
Author(s):  
Yu. P. Boronenko ◽  
◽  
B. A. Abdullaev ◽  
Keyword(s):  
Thermal Properties ◽  
Practical Importance ◽  
Experimental Studies ◽  
The Body ◽  
New Materials ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation ◽  
Perishable Goods ◽  
Heat Transfer Coeffi ◽  
Technical Solutions

Objective: To choose materials and technical solutions for thermal insulation in the structure of the fencing of refrigerated car and container bodies. Methods: Experimental studies of the thermal properties of the selected materials were carried out on a physical model using climatic and test chambers, analytical calculations using thermal conductivity equation. Results: The thermal properties of the thermal fencing structures of the body of refrigerated cars and containers were determined. Practical importance: New materials reduce the heat transfer coeffi cient of the fence, which will reduce fuel consumption and increase the safety of perishable goods, reduce weight and increase the volume of the body

Features of development of functional overstrain at workers of physical work

2020 ◽  
pp. 643-643
Author(s):  
A. V. Kapustina ◽  
V. V. Elizarova ◽  
O. V. Bykova
Keyword(s):  
Functional State ◽  
The Body ◽  
Physical Work ◽  
Manual Labor ◽  
Production Studies ◽  
Professional Groups

The results of the production studies of professional groups of manual labor (stone saws, packers, slingers) are presented. It is shown that a change in the functional state of the body of workers leads to the development of fatigue and overstrain of the body systems of workers.

Soil and ecological division into districts of the Baikal region

2018 ◽  
Vol 940 (10) ◽  
pp. 54-64 ◽  
Author(s):  
I.A. Belozertseva ◽  
A.A. Sorokovoj
Keyword(s):  
Baikal Region ◽  
Soil Cover ◽  
Soil Formation ◽  
Forest Steppe ◽  
Leading Role ◽  
Soil Cover Structure ◽  
Reflecting Surface ◽  
Heat And Moisture ◽  
Made In

On the basis of long-term researches of soils in the territory of Russia and Mongolia soil and ecological division into districts of the Baikal region is carried out. At division into districts the whole set of an environment of soil formation was considered. On the map of soil and ecological division into districts 13 mountain, mid-mountain, low-mountain taiga, foothill, hollow-valley, forest-steppe and steppe provinces reflecting surface device originality as the ratio of balance of heat and moisture forming a basis to zoning is shown against the background of difficult orography are allocated. In total 42 districts on lithologic-geomorphological features are allocated. In formation of distinctions of a soil cover of these provinces the leading role is played by bioclimatic factors and inside them the lithologic-geomorphological ones. In the view of structural approach of the district they are considered as territories with a certain natural change of several types of the soil cover structure caused by features of a relief and the parent rock. The map is made in the MapInfo program. It is revealed that on ill-defined width zoning of soils the vertical one which has a greater influence on soils of this region is imposed. Soils of the Baikal region are not similar to the soils located at the same latitude of the flat European territory of Russia. Zone soils of this territory are specific and original.

Introduction

2018 ◽  
Author(s):  
Nora Goldschmidt ◽  
Barbara Graziosi
Keyword(s):  
Material Culture ◽  
The Body ◽  
Specific Site ◽  
Entire Volume ◽  
The Third ◽  
Religious Significance ◽  
Classical Poetry ◽  
Life Of The Mind ◽  
The Mind ◽  
Made In

The Introduction sheds light on the reception of classical poetry by focusing on the materiality of the poets’ bodies and their tombs. It outlines four sets of issues, or commonplaces, that govern the organization of the entire volume. The first concerns the opposition between literature and material culture, the life of the mind vs the apprehensions of the body—which fails to acknowledge that poetry emerges from and is attended to by the mortal body. The second concerns the religious significance of the tomb and its location in a mythical landscape which is shaped, in part, by poetry. The third investigates the literary graveyard as a place where poets’ bodies and poetic corpora are collected. Finally, the alleged ‘tomb of Virgil’ provides a specific site where the major claims made in this volume can be most easily be tested.

scholarly journals Trapping liquid drugs inside crystals

2014 ◽  
Vol 70 (a1) ◽  
pp. C984-C984
Author(s):  
Alessia Bacchi ◽  
Davide Capucci ◽  
Paolo Pelagatti
Keyword(s):  
Human Health ◽  
Crystal Engineering ◽  
Room Temperature ◽  
The Body ◽  
New Materials ◽  
Active Molecule ◽  
Crystalline Materials ◽  
Pharmaceutical Ingredients ◽  
Solid Dosage ◽  
Intellectual Properties

The objective of this work is to embed liquid or volatile pharmaceuticals inside crystalline materials, in order to tune their delivery properties in medicine or agrochemistry, and to explore new regulatory and intellectual properties issues. Liquid or volatile formulations of active pharmaceutical ingredients (APIs) are intrinsically less stable and durable than solid forms; in fact most drugs are formulated as solid dosage because they tend to be stable, reproducible, and amenable to purification. Most drugs and agrochemicals are manufactured and distributed as crystalline materials, and their action involves the delivery of the active molecule by a solubilization process either in the body or on the environment. However some important compounds for the human health or for the environment occur as liquids at room temperature. The formation of co-crystals has been demonstrated as a means of tuning solubility properties of solid phases, and therefore it is widely investigated by companies and by solid state scientists especially in the fields of pharmaceuticals, agrochemicals, pigments, dyestuffs, foods, and explosives. In spite of this extremely high interest towards co-crystallization as a tool to alter solubility, practically no emphasis has been paid to using it as a means to stabilize volatile or labile or low-melting products. In this work we trap and stabilize volatile and liquid APIs and agrochemicals in crystalline matrices by engineering suitable co-crystals. These new materials alter the physic state of the active ingredients allowing to expand the phase space accessible to manufacturing and delivery. We have defined a benchmark of molecules relevant to human health and environment that have been combined with suitable partners according to the well known methods of crystal engineering in order to obtain cocrystals. The first successful results will be discussed; the Figure shows a cocrystal of propofol, a worldwide use anesthetic.

scholarly journals Non-destructive handheld XRF study of archaeological composite silver objects—the case study of the late Roman Seuso Treasure

2021 ◽  
Vol 13 (5) ◽  
Author(s):  
Viktória Mozgai ◽  
Bernadett Bajnóczi ◽  
Zoltán May ◽  
Zsolt Mráv
Keyword(s):  
Fluorescence Analysis ◽  
The Body ◽  
High Quality ◽  
X Ray ◽  
Composite Objects ◽  
Mechanical Attachment ◽  
Non Destructive ◽  
Made In ◽  
Late Roman

AbstractThis study details the non-destructive chemical analysis of composite silver objects (ewers, situlas, amphora and casket) from one of the most significant late Roman finds, the Seuso Treasure. The Seuso Treasure consists of fourteen large silver vessels that were made in the fourth–early fifth centuries AD and used for dining during festive banquets and for washing and beautification. The measurements were systematically performed along a pre-designed grid at several points using handheld X-ray fluorescence analysis. The results demonstrate that all the objects were made from high-quality silver (above 90 wt% Ag), with the exception of the base of the Geometric Ewer B. Copper was added intentionally to improve the mechanical properties of soft silver. The gold and lead content of the objects shows constant values (less than 1 wt% Au and Pb). The chemical composition as well as the Bi/Pb ratio suggests that the parts of the composite objects were manufactured from different silver ingots. The ewers were constructed in two ways: (i) the base and the body were made separately, or (ii) the ewer was raised from a single silver sheet. The composite objects were assembled using three methods: (i) mechanical attachment; (ii) low-temperature, lead-tin soft solders; or (iii) high-temperature, copper-silver hard solders. Additionally, two types of gilding were revealed by the XRF analysis, one with remnants of mercury, i.e. fire-gilding, and another type without remnants of mercury, presumably diffusion bonding.

scholarly journals Study of the industrial contaminations containing hydrocarbon components and their effect on correlation of protective properties of textiles for clothes

2018 ◽  
Vol 226 ◽  
pp. 02027
Author(s):  
Irina Cherunova ◽  
Elena Yakovleva ◽  
Ekaterina Stefanova
Keyword(s):  
Ministry Of Education ◽  
State Technical ◽  
Potential Influence ◽  
Saturated Hydrocarbons ◽  
Protective Properties ◽  
Textile Materials ◽  
Wet Processing ◽  
Main Components ◽  
High Level ◽  
Made In

The article represents trends and results of world investigations for safety of textile materials for humans and environment. The algorithm for identification of potential influence vector of chemical emissions from textile and the environmentally aimed methods based on the alternative chemical substances for textile wet processing were presented. Using the procedure for oleophobic effect determination, the oil resistance levels of a number of modern fabrics for clothes were established. The experimental research results of the oil products concentration in the textile materials after chemical treatment based on the method of the capillary gas chromatography were presented. It was found out that hydrocarbons from C14H30 Tetradecane to С36Н74 Hexatriacontane are the main components with high level of contaminants concentration. The average values of hydrocarbon concentration on the cleaned up samples for the main areas of the clothe surface were determined. Accumulation of residual contaminations, based on saturated hydrocarbons (С17Н36 – С25Н52 block) and related special-purpose clothes areas, was identified. Recommendations for target-oriented correlation of the clothes protective properties were proposed. UWO (unified work order). The research was made in Don State Technical University within the framework of State Assignment of the Ministry of education and science of Russia under the project 11.9194.2017/BCh.

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