scholarly journals Impact of the High-Energy Dynamic Compaction by Multiple Compactors on the Surrounding Environment

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Chunlin Jiang ◽  
Yanhui Ge ◽  
Baoqun Wang ◽  
Luchen Zhang ◽  
Youbo Liu
Keyword(s):  
Working Conditions ◽  
High Energy ◽  
Measured Data ◽  
Dynamic Compaction ◽  
Time Interval ◽  
Response Model ◽  
Surrounding Environment ◽  
Compaction Energy ◽  
Explicit Dynamic ◽  
The Impact

Dynamic compaction machine (DCM) is a widely adopted ground reinforcement technology. However, dynamic compaction energy has a very significant impact on the surrounding environment. At present, the research on the impact of dynamic compaction mainly focuses on the effect of the tamping behavior of a single compactor in the working state, whereas the research on the impact of multiple compactors working jointly is rare. To study the impact of the dynamic compaction energy of multiple compactors working jointly on the surrounding environment, the dynamic response model for multiple compactors working in the same field was established based on the explicit dynamic analysis module in ABAQUS. The validity of the model was verified by comparison with the measured data. Based on this, the impact of the dynamic compaction energy of multiple compactors with different working conditions in terms of the arrangement, spacing, and working time interval was analyzed. The results showed that the arrangement and spacing of the compactors had a remarkable influence on the distribution of the dynamic compaction energy in the surrounding environment. Under the condition of multiple compactors working with a time interval of less than 10 s, the impact of the superimposed dynamic compaction energy due to the interaction of multiple compactors had to be considered.

The Effectiveness of Dynamic Compaction Under Various Water Levels

2009 ◽  
Author(s):  
Jing-Wen Chen ◽  
Fu-Cheng Chen
Keyword(s):  
Boundary Effect ◽  
Single Point ◽  
Cost Effective ◽  
Soil Liquefaction ◽  
Water Levels ◽  
Dynamic Compaction ◽  
Cost Effective Method ◽  
Compaction Energy ◽  
Soil Densification ◽  
The Impact

Dynamic compaction is currently regarded as one of the quick but cost-effective method for soil densification to resist the potential of soil liquefaction during earthquake. Most practices and studies reveal the depth of densification is mainly limited by the compaction energy without considering the effect of water table. In this experimental study, the impact performances under both presence and absence of water level without changing the compaction energy were presented. The Single-point Impact Test is developed to perform a series of tests on soils under different water levels and drained conditions. Meanwhile, an automatic cone penetrometer is also developed to evaluate the effectiveness. The boundary effect of soil container used in the test is also discussed. The impact-induced pore pressures and dissipation periods are measured and compared with a field measurement. The relationship between the effective dynamic stresses and corresponding cone resistances in soils is highlighted. The performance of dynamic impacts is evaluated by a term of improvement ratio.

Self-assessment by medical workers of the degree of influence of working conditions on the development of occupational diseases

2019 ◽  
pp. 463-467 ◽  
Author(s):  
N. N. Petrukhin ◽  
O. N. Andreenko ◽  
I. V. Boyko ◽  
S. V. Grebenkov
Keyword(s):  
Health Care ◽  
Working Conditions ◽  
Occupational Diseases ◽  
Health Workers ◽  
Medical Personnel ◽  
Long Term Memory ◽  
Self Assessment ◽  
Medical Institutions ◽  
Care Workers ◽  
The Impact

Introduction. The activities of health workers are associated with the impact of many harmful factors that lead to loss of health. Compared with other professional groups, health care workers are ill longer and harder, which may be due to polymorbidity pathology.The aim of the study based on the survey data to study the representation of health workers about working conditions and to identify their impact on the formation of occupational diseases.Materials and methods. In order to get a real idea of the attitude of medical workers to their working conditions in 2018, an anonymous survey was conducted of 1129 doctors and 776 employees of secondary and junior medical personnel working in health care institutions in St. Petersburg, Moscow, Krasnoyarsk, Vologda and Orel.Results. Research of working conditions and health of physicians allowed to establish that work in medical institutions imposes considerable requirements to an organism of working, its physical condition and endurance, volume of operational and long-term memory, ability to resist to mental, moral and ethical overloads.Conclusions: The most important method of combating the development of occupational diseases is their prevention. Organizational and preventive measures should be aimed primarily at monitoring the working conditions and health of medical staff .

Working conditions and occupational pathology of coal miners in the Arctic

2019 ◽  
pp. 452-457 ◽  
Author(s):  
S. A. Gorbanev ◽  
S. A. Syurin ◽  
N. M. Frolova
Keyword(s):  
Coal Mining ◽  
Working Conditions ◽  
Occupational Diseases ◽  
Climatic Factors ◽  
Coal Mines ◽  
The Arctic ◽  
Morbidity Rate ◽  
Coal Miners ◽  
Increased Risk ◽  
The Impact

Introduction. Due to the impact of adverse working conditions and climate, workers in coal-mining enterprises in the Arctic are at increased risk of occupational diseases (OD).The aim of the study was to study the working conditions, causes, structure and prevalence of occupational diseases in miners of coal mines in the Arctic.Materials and methods. Th e data of social and hygienic monitoring “Working conditions and occupational morbidity” of the population of Vorkuta and Chukotka Autonomous District in 2007–2017 are studied.Results. It was established that in 2007–2017 years, 2,296 ODs were diagnosed for the first time in 1851 coal mines, mainly in the drifters, clearing face miners, repairmen and machinists of mining excavating machines. Most often, the ODs occurred when exposed to the severity of labor, fibrogenic aerosols and hand-arm vibration. The development of professional pathology in 98% of cases was due to design flaws of machines and mechanisms, as well as imperfections of workplaces and technological processes. Diseases of the musculoskeletal system (36.2%), respiratory organs (28.9%) and nervous system (22.5%) prevailed in the structure of professional pathology of miners of coal mines. Among the three most common nosological forms of OD were radiculopathy (32.1%), chronic bronchitis (27.7%) and mono-polyneuropathy (15.4%). In 2017, coal miners in the Arctic had a professional morbidity rate of 2.82 times higher than the national rates for coal mining.Conclusions. To preserve the health of miners of coal mining enterprises, technical measures to improve working conditions and medical interventions aimed at increasing the body’s resistance to the effects of harmful production and climatic factors are necessary.

Working conditions and the formation of health risks among workers of the petrochemical industry engaged in the production of methanol and its derivatives

2019 ◽  
pp. 266-271
Author(s):  
Nina M. Meshchakova ◽  
Marina P. Dyakovich ◽  
Salim F. Shayakhmetov
Keyword(s):  
Working Conditions ◽  
Health Risks ◽  
Quantitative Assessment ◽  
Circulatory System ◽  
Medical Examination ◽  
Physical Factors ◽  
Labor Intensity ◽  
Industrial Noise ◽  
Harmful Substances ◽  
The Impact

Introduction.Methanol and its derivatives occupy one of the leading places among the main organic synthesis intermediates in terms of their importance and scale of production. According to experts, by 2027 the global demand for methanol can reach 135 million tons, the annual growth will be about 5.5%. However, there is little information regarding the assessment of working conditions and occupational risks for workers in modern methanol production and its derivatives.The aim of the studyis hygienic assessment of working conditions and the formation of health risks in workers of modern production of methanol and methylamines.Materials and methods.The assessment of the main adverse factors of production is given. When studying the state of health, objective indicators (the results of an in-depth medical examination) and subjective (the results of a quantitative assessment of the risks of the main pathological syndromes associated with health) are considered.Results.According to long-term observations, the concentration of harmful substances in the air of the working area, indicators of labor severity, parameters of physical factors met hygienic requirements, with the exception of industrial noise exceeding the maximum permissible level, as well as labor intensity of 1 degree. The General assessment of working conditions corresponds to the category of harmful 2 degrees (3.2). According to the results of the medical examination and quantitative assessment of the risks of health disorders in workers, the most significant were functional disorders and diseases of the circulatory system. The levels of somatic pathology on the part of the main body systems were significantly higher in apparatchiks compared to the engineering and technical personnel (ETP).Conclusions:In the production of methyl alcohol and methylamines, the main hygienic importance is the impact on workers of the complex of harmful substances of 1-IV hazard classes in low concentrations, increased levels of industrial noise, labor intensity of 1 degree. According to the subjective assessment of health and medical examination, the greatest prevalence of health risks in workers was observed from the circulatory system, and the levels of the revealed somatic pathology were statistically significantly higher in apparatchiks compared with the ETP.

Surveying adherence of dental clinic patients to preventive measures in oral cavity

2019 ◽  
Vol 24 (2) ◽  
pp. 167-172 ◽  
Author(s):  
T. V. Kudryavtseva ◽  
V. V. Tachalov ◽  
E. S. Loboda ◽  
L. Yu. Orekhova ◽  
E. Yu. Nechai ◽  
...  
Keyword(s):  
Oral Cavity ◽  
Working Conditions ◽  
Oral Hygiene ◽  
Preventive Measures ◽  
Periodontal Diseases ◽  
Dental Health ◽  
Developed Countries ◽  
Dental Clinic ◽  
The Many ◽  
The Impact

Relevance. Periodontal diseases are a medical and social problem due to the wide spread among the population of developed countries and the impact on the quality of life. Among the many factors that are important in the development of inflammatory periodontal diseases, an important role is played by adherence to the recommendations of the dentist in respecting oral hygiene. Aim of the work was to study the adherence of patients of the dental clinic to compliance with preventive measures in the oral cavity.Materials and methods. A total of 98 patients of dental clinic, 62 female (medial age 38,6 ± 14,0 years) and 36 male (medial age 37,2±13,1 years) participated in survey. The study participants flled in the profle and answered questions about age, gender, harmful working conditions and bad habits, frequency of visits to the dental clinic, attitudes to the prevention of dental diseases, knowledge about the means and methods of oral hygiene.Results. As a result of the study, it was found that in the vast majority of cases, respondents are employed in production that does not adversely affect their health (91%), only 8% of patients indicated harmful working conditions.Conclusions. The study revealed that, despite the recommendations of the dentist, patients are not always committed to the implementation of preventive measures in the oral cavity. Dentists need to motivate patients to use not only the usual methods and means of hygiene, but also additional ones necessary for maintaining dental health.

Professional risk in processing processes complex (review of literature)

2020 ◽  
pp. 29-37
Author(s):  
L. Mavrina ◽  
E. Shaikhlislamova ◽  
I. Khasanova ◽  
L. Karimova ◽  
N. Muldasheva ◽  
...  
Keyword(s):  
Working Conditions ◽  
Urgent Problem ◽  
Review Of Literature ◽  
Complex Materials ◽  
Work Analysis ◽  
Production Factors ◽  
Bibliographic Data ◽  
Industrial Injuries ◽  
The Impact ◽  
Safe Working

The relevance of the problem. Ensuring safe working conditions is currently an urgent problem of our time. Purpose of work. Analysis of bibliographic data on issues of occupational risk, industrial injuries among workers of the processing complex. Materials and methods. To achieve this goal, materials related to this topic were studied in the works of domestic and foreign scientists. Results. A lot of scientific works are devoted to the problem of assessing professional risk in the production of a processing complex. Modern research has proved that risk assessment is one of the main methods for analyzing the impact of various production factors on an employee. Conclusion Occupational morbidity and industrial injuries are a consequence of unsatisfactory conditions and labor protection in enterprises.

scholarly journals Shock interactions in inviscid air and $$\hbox {CO}_2$$–$$\hbox {N}_2$$ flows in thermochemical non-equilibrium

Shock Waves ◽  
2021 ◽  
Author(s):  
C. Garbacz ◽  
W. T. Maier ◽  
J. B. Scoggins ◽  
T. D. Economon ◽  
T. Magin ◽  
...  
Keyword(s):  
Chemical Species ◽  
High Energy ◽  
Ideal Gas ◽  
Shock Interaction ◽  
Interaction Patterns ◽  
Shock Interactions ◽  
Wave Interference ◽  
Type V ◽  
The Impact ◽  
Non Equilibrium

AbstractThe present study aims at providing insights into shock wave interference patterns in gas flows when a mixture different than air is considered. High-energy non-equilibrium flows of air and $$\hbox {CO}_2$$ CO 2 –$$\hbox {N}_2$$ N 2 over a double-wedge geometry are studied numerically. The impact of freestream temperature on the non-equilibrium shock interaction patterns is investigated by simulating two different sets of freestream conditions. To this purpose, the SU2 solver has been extended to account for the conservation of chemical species as well as multiple energies and coupled to the Mutation++ library (Multicomponent Thermodynamic And Transport properties for IONized gases in C++) that provides all the necessary thermochemical properties of the mixture and chemical species. An analysis of the shock interference patterns is presented with respect to the existing taxonomy of interactions. A comparison between calorically perfect ideal gas and non-equilibrium simulations confirms that non-equilibrium effects greatly influence the shock interaction patterns. When thermochemical relaxation is considered, a type VI interaction is obtained for the $$\hbox {CO}_2$$ CO 2 -dominated flow, for both freestream temperatures of 300 K and 1000 K; for air, a type V six-shock interaction and a type VI interaction are obtained, respectively. We conclude that the increase in freestream temperature has a large impact on the shock interaction pattern of the air flow, whereas for the $$\hbox {CO}_2$$ CO 2 –$$\hbox {N}_2$$ N 2 flow the pattern does not change.

scholarly journals Time-to-Treatment in Oral Cancer: Causes and Implications for Survival

Cancers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1321
Author(s):  
Constanza Saka-Herrán ◽  
Enric Jané-Salas ◽  
Antoni Mari-Roig ◽  
Albert Estrugo-Devesa ◽  
José López-López
Keyword(s):  
Oral Cancer ◽  
Previous Treatment ◽  
Diagnostic Procedures ◽  
Original Data ◽  
Primary Treatment ◽  
Medical Attention ◽  
Time Interval ◽  
Pre Treatment ◽  
The Impact ◽  
Lack Of Knowledge

The purpose of this review was to identify and describe the causes that influence the time-intervals in the pathway of diagnosis and treatment of oral cancer and to assess its impact on prognosis and survival. The review was structured according to the recommendations of the Aarhus statement, considering original data from individual studies and systematic reviews that reported outcomes related to the patient, diagnostic and pre-treatment intervals. The patient interval is the major contributor to the total time-interval. Unawareness of signs and/or symptoms, denial and lack of knowledge about oral cancer are the major contributors to the process of seeking medical attention. The diagnostic interval is influenced by tumor factors, delays in referral due to higher number of consultations and previous treatment with different medicines or dental procedures and by professional factors such as experience and lack of knowledge related to the disease and diagnostic procedures. Patients with advanced stage disease, primary treatment with radiotherapy, treatment at an academic facility and transitions in care are associated with prolonged pre-treatment intervals. An emerging body of evidence supports the impact of prolonged pre-treatment and treatment intervals with poorer survival from oral cancer.

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