DETERMINATION OF THE COEFFICIENT OF THE DYNAMIC SHAPE OF DUST PARTICLES RELEASED IN THE AREA OF GRINDING MACHINES

2021 ◽  
pp. 19-27
Author(s):  
Иван Александрович Бурьянов ◽  
Иван Николаевич Логачев ◽  
Константин Иванович Логачев ◽  
Александр Борисович Гольцов
Keyword(s):  
Occupational Diseases ◽  
Prolonged Exposure ◽  
The Body ◽  
Dust Particles ◽  
Dust Collector ◽  
Shape Coefficient ◽  
Grinding Machines ◽  
The Village ◽  
Dynamic Shape

При проведении работ по заточке твердосплавных инструментов абразивными кругами на универсальных заточных станках образуется значительное количество пылевых частиц. Часть пылевых частиц, в зависимости от размеров, находится во взвешенном состоянии. Длительное воздействие пылевых аэрозолей на организм рабочих может привезти к развитию большого количества профессиональных заболеваний дыхательных путей. Установлено, что на характер движения пылевых частиц в рабочей зоне и скорость их осаждения влияет такой параметр, как форма пылевой частицы. Материал для исследования и расчета был собран на предприятии ООО «Русский инструмент», которое расположено в пгт. Северный, Белгородского района. Отбор проб производился в разных зонах заточного участка. На основе имеющихся проб пылевых частиц, на базе лаборатории БГТУ им. В. Г. Шухова, были получены результаты электронной микроскопии. Целью данной работы является определение коэффициента формы пылевых частиц, с использованием существующих методик определения данного коэффициента. Полученные результаты позволяют дополнить исходные данные для разработки математической модели процессов течения пылевых частиц вблизи местного отсоса и последующего компьютерного моделирования течений пылевых аэрозолей в кожухе-пылеуловителе. When working on sharpening carbide tools with abrasive wheels on universal grinding machines, a significant amount of dust particles is formed. A certain part of the dust particles, depending on the size, is suspended. Prolonged exposure to dust aerosols on the body of machine turners can lead to the development of a large number of occupational diseases of the respiratory tract. It is established that in the working area, the nature of the movement of dust particles, as well as the rate of their deposition, is affected by such a parameter as the shape of the dust particle. The material for the study, calculation and subsequent computer simulation of the dust aerosol flows in the dust collector casing was collected at the OOO Russian Tool, which is located in the village Severny, Belgorod district. The samples were taken in different zones of the grinding area. Based on the available samples of dust particles, the results of electron microscopy were obtained at the laboratory of BSTU named after V. G. Shukhov. The purpose of this work is to describe the results obtained and determine the shape coefficient of dust particles, using existing methods for determining this coefficient. The material of the work allows us to supplement the initial data for the development of a mathematical model of the processes of the flow of dust particles near the local suction.

Evaluasi Ukuran Tubuh Turunan Sapi Aceh dengan Sistem Pemeliharaan Berbeda di Kecamatan Indrapuri, Aceh Besar

2017 ◽  
Vol 2 (4) ◽  
Author(s):  
Furkan Herry ◽  
Mohammad Agus Nashri A. ◽  
Asril Asril
Keyword(s):  
Body Size ◽  
Body Length ◽  
The Body ◽  
Chest Circumference ◽  
Maintenance System ◽  
Weaning Age ◽  
Maintenance Systems ◽  
Observation Method ◽  
The Village

Penelitian ini dilaksanakan di 3 desa yang berbeda di Kecamatan Indrapuri, Kabupaten Aceh Besar. Penelitian berlangsung selama 30 hari yang dimulai dari tanggal 18 Februari - 19 Maret 2017. Penelitian ini bertujuan untuk mengevaluasi ukuran tubuh turunan sapi aceh pada umur sapih dengan sisitem pemeliharaan yang berbeda. Materi  yang digunakan dalam penelitian ini adalah anak sapi Aceh lepas sapih sebanyak 24 ekor. Metode penelitian ini menggunakan metode observasi yaitu dengan cara mengukur ternak turunan sapi Aceh lepas sapih tersebut. Penentuan desa dengan mempertimbangkan adanya sistem pemeliharaan sapi secara ekstensif dan intensif dan jumlah ternak sapi lepas sapih terpenuhi untuk pengambilan sampel. Parameter yang diamati dalam penelitian ini adalah lingkar dada, panjang badan, dan tinggi pundak. Hasil penelitian menunjukkan ukuran lingkar dada turunan sapi Aceh pada umur sapih yang di pelihara dengan system intensif menunjukkan ukuran yang lebih tinggi di bandingkan dengan ukuran lingkar dada yang dipelihara dengan system pemeliharaan ekstensif dan pada pengukuran panjang badan dan tinggi gumba turunan sapi Aceh yang di pelihara dengan system ekstensif menunjukkan ukuran yang lebih tinggi dibandingkan dengan ukuran  panjang badan dan tinggi gumba yang di pelihara dengan sistem intensifEvaluation of Body Size of Aceh Cow Beans with Different Maintenance System in Indrapuri Sub-district, Aceh BesarThis research was conducted in 3 different villages in Indrapuri Sub-district, Aceh Besar District. The study lasted for 30 days starting from February 18 to March 19, 2017. This study aims to evaluate the body size of aceh cows at the weaning age with different maintenance systems. The material used in this study is Aceh calf off weeds as much as 24 tail. This research method using the observation method that is by measuring the cattle of Aceh cattle derivatives off the weaning. Determination of the village taking into account the existence of an extensive and intensive cattle breeding system and the number of loose weaning cattle is fulfilled for sampling. Parameters observed in this study were chest circumference, body length, and shoulder height. The results showed that the size of the chest circumference of cows of Aceh cattle at the age of weaning with intensive care system showed a higher size in comparison with the size of the chest circumference maintained with extensive maintenance system and on the measurement of the length and height of the gumba derived from Aceh cows Extensive systems show a higher size compared to the size of the body length and height of the gumba maintained in an intensive system

scholarly journals Prevalence of Non-Occupational Disorders in Men with Occupational Vibration Disease

2021 ◽  
pp. 4-8
Author(s):  
AV Gurev ◽  
AR Tukov ◽  
AYu Bushmanov
Keyword(s):  
Musculoskeletal Disorders ◽  
Occupational Diseases ◽  
Endocrine System ◽  
Precise Determination ◽  
The Body ◽  
Health Centers ◽  
Study Cohort ◽  
Vibration Disease ◽  
Reliable Source

Introduction: Industrial vibration has a complex effect on the body, increasing the risk of diseases from the circulatory and respiratory systems, disorders of the liver and endocrine system, which are not recognized by medical boards as occupational. The objective of our study was to analyze the prevalence of non-occupational diseases in workers suffering from occupational vibration disease and employed in industries and institutions served by health facilities of the Russian Federal Medical-Biological Agency (FMBA). Materials and methods: As a reliable source of information, we used the Industry Register of Persons with Occupational Diseases containing data on 95 cases of occupational vibration disease aged 65.1 ± 1.5 (90 men aged 64.8 ± 1.5 years and 5 women aged 70.6 ± 2.6 years). The prevalence rates are given per 1,000 cases of occupational vibration disease with an error of the intensive indicator and the proportion of the pathology in the structure of non-occupational diseases. Results: The prevalence of non-occupational diseases in men was 755.6 ± 91.6. Of these, musculoskeletal disorders (288.9±47.8; 39.4 %) ranked first, followed by diseases of the cardiovascular (177.8 ± 40.3; 24.2 %), respiratory (111.1 ± 33.1; 15.2 %), and digestive (66.7 ± 26.3; 9.1 %) systems. Discussion: We established that diseases of the musculoskeletal system and other disorders potentially related to occupational vibration dominated in the structure of non-occupational diseases in the study cohort. Conclusion: Cases of occupational vibration disease often suffer from musculoskeletal disorders, diseases of the circulatory, respiratory and digestive systems, accounting for 87.9 % of all non-occupational illnesses in this research. We recommend a more precise determination of occupational or non-occupational genesis of musculoskeletal disorders in people exposed to vibration at work in occupational health centers.

scholarly journals DETERMINATION OF THE MAIN PROPERTIES OF DUST PARTICLES IN THE GRINDING AREA

2020 ◽  
Vol 5 (10) ◽  
pp. 23-32
Author(s):  
I. Bur'yanov ◽  
K. Logachev ◽  
Valerij Uvarov
Keyword(s):  
Metal Cutting ◽  
Negative Impact ◽  
Dust Particles ◽  
Dust Collector ◽  
Dust Emissions ◽  
Aspiration System ◽  
Work Area ◽  
Production Company ◽  
Metal Tools

The abrasive processing of metal products is accompanied by harmful dust emissions into the work area. Exceeding the MPC of dust particles in the work area has a negative impact on the health of working personnel-it leads to occupational diseases of dust etiology. To localize harmful dust emissions when working on grinding machines, there are various dust collectors and their modifications, which allow to deal with harmful dust emissions with different efficiency. The design of the dust collector shrouds may involve connecting to an aspiration system that creates a low-pressure zone in the housing of the shroud, and thereby helps to remove harmful particles released during work. To correctly calculate the costs of air removed by local suction systems, it is necessary to analyze the dust situation and determine the properties of dust aerosols at a specific enterprise. In this work, the analysis of samples of dust particles selected at the grinding site of the plant for the manufacture of metal-cutting and metal tools, as well as technological equipment of LLC Production Company "Russian tool". Obtaining correct and up-to-date data on the size and chemical analysis of dust particles is necessary for the development of an energy-efficient aspiration system, as well as a mathematical model of the movement of dust particles.

Gender determination of caucasoid hair using image analysis

1993 ◽  
Vol 51 ◽  
pp. 216-217
Author(s):  
T.B. Ball ◽  
W.M. Hess
Keyword(s):  
Image Analysis ◽  
Cross Sections ◽  
Scalp Hair ◽  
The Body ◽  
Equivalent Diameter ◽  
Cross Sectional ◽  
Hair Samples ◽  
Length Width ◽  
Morphological Differences

It has been demonstrated that cross sections of bundles of hair can be effectively studied using image analysis. These studies can help to elucidate morphological differences of hair from one region of the body to another. The purpose of the present investigation was to use image analysis to determine whether morphological differences could be demonstrated between male and female human Caucasian terminal scalp hair.Hair samples were taken from the back of the head from 18 caucasoid males and 13 caucasoid females (Figs. 1-2). Bundles of 50 hairs were processed for cross-sectional examination and then analyzed using Prism Image Analysis software on a Macintosh llci computer. Twenty morphological parameters of size and shape were evaluated for each hair cross-section. The size parameters evaluated were area, convex area, perimeter, convex perimeter, length, breadth, fiber length, width, equivalent diameter, and inscribed radius. The shape parameters considered were formfactor, roundness, convexity, solidity, compactness, aspect ratio, elongation, curl, and fractal dimension.

Determination of the profile of the temperature field of material heated by continuous laser radiation

2020 ◽  
pp. 51-10
Author(s):  
B.A. Lapshinov ◽  
◽  
N.I. Timchenko ◽  
Keyword(s):  
Temperature Field ◽  
Optical Fiber ◽  
Prolonged Exposure ◽  
Radiation Spectrum ◽  
Visible Range ◽  
Continuous Laser ◽  
Surface Temperature Distribution ◽  
Continuous Radiation ◽  
Spectral Pyrometry

Spectral pyrometry was used to determine the surface temperature distribution of Si, Nb, Cu, and graphite samples when they were locally heated by continuous radiation of an Nd:YAG laser (λ = 1.064 μm). With prolonged exposure to radiation, a stationary temperature field was established in the samples. The thermal spectra were recorded with a small spectrometer in the visible range in the temperature range above 850 K. The optical fiber used to transmit the radiation spectrum to the spectrometer had an additional diaphragm with a diameter of 1 mm located at a certain distance from the fiber end, which ensured the locality of the recorded spectra. The optical fiber moved continuously along the sample, and the spectrometer recorded up to 100 spectra with a frequency of 5-10 Hz. The temperature profile of the samples was calculated based on the results of processing the spectra using the Spectral Pyrometry program.

Determination of Lead Content in Red Colored Lipsticks from Mandalay Market by Flame Atomic Absorption Spectrophotometer

2018 ◽  
Vol 30 (3) ◽  
pp. 167-173
Keyword(s):  
Sampling Procedure ◽  
The Body ◽  
Lead Content ◽  
Social Psychological ◽  
Allowable Limit ◽  
Flame Atomic Absorption ◽  
Therapeutic Benefits ◽  
Flame Atomic Absorption Spectrophotometer ◽  
Exposure Levels

Red colored lipstick is the most widely used cosmetic product. Although lipstick gives a lot of social, psychological and therapeutic benefits, it may harm the consumers. Because some lipsticks contain a considerable amount of heavy metal especially lead. Lead is being used in lipstick mainly for the pigments required to obtain needed colors. Lead accumulates in the body over time and lead-containing lipstick applied several times a day, every day, combined with lead in water and other sources, could add up to significant exposure levels. Therefore, this study was aimed to determine lead content in red colored lipsticks from market. This study was laboratorybased, analytical study by using 25 lipstick samples. Red colored lipsticks were bought from Mandalay Market by random sampling procedure and they were completely coded to avoid the bias. Then, lead content in coded samples was determined by Flame AAS according to International Conference on Harmonization (ICH) guideline. Lead contents of 88% of the lipsticks samples were more than specified limit (20 ppm) of Food and Drug Administration, United States. All of them, lead content was highest in counterfeit lipsticks group. Among the tested lipstick samples, lipstick with lowest lead content was LE-RL 01 (15.74 ppm) and the lipstick with highest lead content was CF-RL 01(60.09 ppm). In conclusion, lead contents of red colored lipsticks (22 out of 25) from market samples were higher than allowable limit (20 ppm).

DINAMIKA POLITIK PERSETUJUAN BERSAMA TENTANG PENETAPAN DESA ADAT DI KABUPATEN ROKAN HULU TAHUN 2014

2017 ◽  
Vol 15 (1) ◽  
pp. 21
Author(s):  
Haryo Suganda ◽  
Raja Muhammad Amin
Keyword(s):  
Regulatory Region ◽  
Field Research ◽  
Analysis Techniques ◽  
Political Dynamics ◽  
Political Interests ◽  
Wide Range ◽  
Information Method ◽  
Qualitative Descriptive ◽  
The Village

This study is motivated the identification of policies issued by the regional Governmentof Rokan Hulu in the form of Regulatory region number 1 by 2015 on the determination of thevillage and Indigenous Village. Political dynamics based on various interests against themanufacture of, and decision-making in the process of formation of the corresponding localregulations determination of Indigenous Villages in the Rokan Hulu is impacted to a verysignificantamount of changes from the initial draft of the number i.e. 21 (twenty one) the villagebecame Customary 89 (eighty-nine) the Indigenous Villages who have passed. Type of thisresearch is a qualitative descriptive data analysis techniques. The research aims to describe theState of the real situation in a systematic and accurate fact analysis unit or related research, aswell as observations of the field based on the data (information). Method of data collectionwas done with interviews, documentation, and observations through fieldwork (field research).The results of the research on the process of discussion of the draft local regulations andmutual agreement about Designation of Indigenous Villages in the Rokan Hulu is, showed thatthe political dynamics that occur due to the presence of various political interests, rejectionorally by Villagers who were judged to have met the requirements of Draft Regulations to beformulated and the area for the set to be Indigenous Villages, and also there is a desire fromsome villages in the yet to Draft local regulations in order to set the Indigenous village , there isa wide range of interests of these aspects influenced the agreement to assign the entire localVillage which is in the Rokan Hulu become Indigenous village, and the village of Transmigrationinto administrative Villages where the initiator of the changes in the number of IndigenousVillages in the Rokan Hulu it is the desire of the local Government of its own.

Fast Method for the Determination of Residual Solvents in Radiopharmaceutical Products

2017 ◽  
Vol 68 (4) ◽  
pp. 666-670 ◽  
Author(s):  
Mirela Mihon ◽  
Catalin Stelian Tuta ◽  
Alina Catrinel Ion ◽  
Dana Niculae ◽  
Vasile Lavric
Keyword(s):  
Gas Chromatography ◽  
Control Method ◽  
Limit Of Detection ◽  
The Body ◽  
Biologically Active ◽  
Injection Technique ◽  
Fast Method ◽  
Residual Solvent ◽  
Residual Solvents

The aim of this work was the development and validation of a fast analytical method to determine the residual solvents content in radiopharmaceuticals such as: 18F-Fluorodeoxyglucose (18F-FDG), 18F-Fluoroestradiol (18F-FES), 18F-Fluorothymidine (18F-FLT),18F-Fluoromisonidazole (18F-FMISO). Radiopharmaceuticals are radioactive preparations for medical purposes used in nuclear medicine as tracers in diagnostic imaging and treatment of certain diseases. Positron Emission Tomography (PET) is a medical imaging technique that consists in introducing into the body of a small amount of a biologically active chemical compound labelled with a short lived positron-emitting radioisotope (18F, 11C, 68Ga). Residual solvents are critical impurities in radiopharmaceuticals that can affect labelling, stability and physicochemical properties of drugs. Therefore, the determination of these solvents is essential for quality control of radiopharmaceuticals. Validation of the control method for residual solvents by gas chromatography is referred by the European Pharmacopoeia using a special injection technique (head space). The parameters of the method, which comply with International Conference on Harmonization guidelines, are: accuracy, precision, linearity, limit of detection, limit of quantification and robustness. The proposed method (direct gas chromatography injection) proved to be linear, precise, accurate and robust. Good linearity was achieved for all the solvents and correlation coefficients (R2) for each residual solvent were found more than 0.99.

scholarly journals Mathematical Modeling and Numerical Simulation of Atherosclerosis Based on a Novel Surgeon’s View

2021 ◽  
Author(s):  
Meisam Soleimani ◽  
Axel Haverich ◽  
Peter Wriggers
Keyword(s):  
Mathematical Modeling ◽  
Inflammatory Response ◽  
Phase Field ◽  
Mechanical Response ◽  
Type Equation ◽  
The Body ◽  
Vasa Vasorum ◽  
Diffusion Reaction ◽  
Dust Particles ◽  
Driving Mechanism

AbstractThis paper deals with the mathematical modeling of atherosclerosis based on a novel hypothesis proposed by a surgeon, Prof. Dr. Axel Haverich (Circulation 135(3):205–207, 2017). Atherosclerosis is referred as the thickening of the artery walls. Currently, there are two schools of thoughts for explaining the root of such phenomenon: thickening due to substance deposition and thickening as a result of inflammatory overgrowth. The hypothesis favored here is the second paradigm stating that the atherosclerosis is nothing else than the inflammatory response of of the wall tissues as a result of disruption in wall nourishment. It is known that a network of capillaries called vasa vasorum (VV) accounts for the nourishment of the wall in addition to the natural diffusion of nutrient from the blood passing through the lumen. Disruption of nutrient flow to the wall tissues may take place due to the occlusion of vasa vasorums with viruses, bacteria and very fine dust particles such as air pollutants referred to as PM 2.5. They can enter the body through the respiratory system at the first place and then reach the circulatory system. Hence in the new hypothesis, the root of atherosclerotic vessel is perceived as the malfunction of microvessels that nourish the vessel. A large number of clinical observation support this hypothesis. Recently and highly related to this work, and after the COVID-19 pandemic, one of the most prevalent disease in the lungs are attributed to the atherosclerotic pulmonary arteries, see Boyle and Haverich (Eur J Cardio Thorac Surg 58(6):1109–1110, 2020). In this work, a general framework is developed based on a multiphysics mathematical model to capture the wall deformation, nutrient availability and the inflammatory response. For the mechanical response an anisotropic constitutive relation is invoked in order to account for the presence of collagen fibers in the artery wall. A diffusion–reaction equation governs the transport of the nutrient within the wall. The inflammation (overgrowth) is described using a phase-field type equation with a double well potential which captures a sharp interface between two regions of the tissues, namely the healthy and the overgrowing part. The kinematics of the growth is treated by classical multiplicative decomposition of the gradient deformation. The inflammation is represented by means of a phase-field variable. A novel driving mechanism for the phase field is proposed for modeling the progression of the pathology. The model is 3D and fully based on the continuum description of the problem. The numerical implementation is carried out using FEM. Predictions of the model are compared with the clinical observations. The versatility and applicability of the model and the numerical tool allow.

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