Occupational pneumoconiosis remains the most common occupational disease in China, with occupational mineral dust exposure being its primary causative factor. Although national standards for online monitoring and early warning systems of coal mine dust concentrations have been established, national occupational health standards for rapid and online monitoring of dust concentration and particle size distribution in other industries are still limited. Among dust concentration sensor technologies, the light scattering method is the preferred choice for online dust monitoring owing to its wide measurement range and low cost. The beta-ray absorption method is mature but highly sensitive to humidity. The electrostatic induction method offers high sensitivity, simple structure, and low maintenance costs but exhibits high errors in low-concentration dust monitoring. The tapered element oscillating microbalance method is highly sensitive but costly. Multi-sensor data fusion technology can improve monitoring reliability, however, mature domestic products are not yet available. For monitoring dust particle size distribution, sieving and sedimentation methods are cumbersome. The aerodynamic method shows broad prospects in the online monitoring of respirable dust but has obvious measurement errors for larger dust particles. The use of optical measurement method is limited by dust morphology and is not suitable for monitoring coal dust particle size distribution. The electrical mobility method is primarily applicable to submicron dust. Future research should focus on promoting the application of monitoring technology for respirable dust particle size distribution in online monitoring of industrial dust. By integrating Internet of Things, data mining, and artificial intelligence technologies, along with multi-sensor data fusion and numerical simulation, dust concentration prediction models can be established to achieve accurate dust concentration monitoring and early warning of exceedances. The advancements of technologies will provide scientific support for the assessment of industrial dust hazards and the prevention and control of occupational pneumoconiosis.

Objective:To understand the status quo of nutrition knowledge, attitude and behavior of nurses in class A tertiary hospital and its influencing factors, and to provide reference for the development of reasonable and standard nutrition training courses.Methods:The knowledge, attitude and behavior of nutrition of 207 nurses in 28 class A tertiary hospitals from 17 provinces cities on October 25-26, 2019 were investigated Questionnaire on Nutritional Knowledge, Attitude and Behavior Cognition of Nurses.Results:The scores of nurses′ nutritional knowledge, attitude and behavior were (69.70 ± 2.92), (82.76 ± 4.97) and (64.90 ± 4.77) respectively. There were significant differences in nurses′ nutritional knowledge, attitude and behavior at different ages, nursing ages, whether they had children, the highest educational background, department rotation, technical titles, administrative positions, employment methods, article publication, whether they had participated in nutrition training courses and in different regions ( F values were 6.80-60.95, t values were 2.94-7.08, all P<0.05). The main factors affecting nutrition knowledge were region, nursing age, the highest educational background, department rotation and whether they had participated in nutrition training courses ( t values were -6.88-6.73, all P<0.05). The main factors affecting nutritional attitude were region, nursing age and the highest educational background ( t=-2.22, 6.84, 3.21, all P<0.05). The main factor affecting nutritional behavior was nursing age ( t=5.45, P<0.05). Conclusions:Nurses′ nutritional attitude level is excellent, but their mastery of nutritional knowledge and nutritional nursing behavior level need to be improved. Reasonable, scientific and feasible nutritional training courses should be formulated according to the influencing factors of their nutritional knowledge, attitude and behavior, so as to improve nurses′ nutritional knowledge, belief and behavior level and improve the nutritional status and prognosis of hospitalized patients.

In order to solve the problem of dust hazard of vibrating screen machine and difficult treatment in catalyst production process, computational fluid dynamics software Fluent was used to carry out numerical simulation calculation of the local exhaust dust removal system for the main dust dispersing points of the vibrating screen machine, including fine/coarse particles outlet and product outlet blowing and cleaning the dust points. The optimal design scheme and key technical parameters of local ventilation and dust removal system of vibrating screen machine were proposed. The results showed that the dust diffusion could be prevented by setting up an upper suction hood without air blowing, but the exhaust air volume needed to be calculated accurately. On the premise of purge, it is necessary to control the air volume to form a wind speed band of 8 m/s with a height of 15 cm at the feed port, so as to effectively remove the dust on the surface of solid particles of catalyst products and ensure that the catalyst products will not be blown away when falling into the feed barrel. The simulated design was applied to the vibrating sieve powder machine of a catalyst company, and the maximum dust concentration in the workplace was reduced from 45.80 mg/m 3 to 5.46mg/m 3, which effectively improved the working environment in the workplace.

Objective:To retrieve the evidence for the prevention and control of lung infection risk factors after hip fracture surgery in geratic patients at home and abroad, so as to summarize the best evidence.Methods:Clinical decision-making, guidelines and evidence summary were systematically retrieved in UpToDate, British Medical Journal (BMJ) Best Practice, Guidelines International Network, National Guideline Clearinghouse, National Institute for Health and Care Excellence, British Orthopaedic Association, Australian and New Zealand Society for Geriatric Medicine, European Society of Trauma and Emergency Surgery, European Respiratory Society and Chinese Medical Association, and the search time limit was from the establishment of the database to September 30, 2020. The thematic evidence summary literature was supplementally searched in PubMed, Cochrane Library, China National Knowledge Infrastructure (CNKI) and other databases, and the search time limit was from January 1, 2018 to September 30, 2020.Results:Totals of 2 clinical decisions, 15 evidence-based guidelines, and 1 evidence summary were included. A total of 64 pieces of evidence were summarized from the aspects of perioperative multidisciplinary team construction, personnel training, risk factor screening and evaluation, and risk factor control.Conclusions:Prevention of lung infections after hip fractures in geratic patients requires multidisciplinary collaboration. It is of positive significance to transform the evidence included in this study into a clustered, multidisciplinary clinical implementation plan for the purpose of prevention and control.

Objective:To systematically evaluate and analyze the risk factors for postoperative pulmonary infection in elderly patients with hip fractures.Methods:Two researchers independently searched PubMed, Cochrarne Library, Web of Science, Embase, CINAHL, Chinese Biomedical Literature Database, China National Knowledge Internet (CNKI), VIP, Wanfang database on the cohort or case-control studies on risk factors for postoperative lung infection in elderly patients with hip fracture hip fractures. The search time limit was from the establishment of the databases to June 15, 2020. After literature screening, literature quality evaluation and data extraction, Meta-analysis was performed using RevMan 5.4 software.Results:A total of 17 literatures were included, including 11 Chinese literatures and 6 English literatures. Meta-analysis results showed that male, age of 75 years or older, surgery waiting time greater than 48 hours, surgery time greater than 2 hours, general anesthesia, smoking (history), combination with stroke, anemia, combination with chronic obstructive pulmonary disease (COPD), combination with respiratory disease, hypoproteinemia, American Society of Anesthesiologists gradeⅢ orⅣ, mechanical ventilation, serum vitamin 25 (OH) D deficiency, admission to Intensive Care Unit, combination with diabetes mellitus, the number of preoperative complications greater than 3, cognitive dysfunction and low functional status were risk factors of postoperative lung infection in elderly patients with hip fractures ( P<0.05) . Conclusions:The postoperative pulmonary infection in elderly patients with hip fractures is affected by many factors. It is suggested to establish a multidisciplinary team to timely and accurately identify risk factors of postoperative pulmonary infection and take active measures to prevent the occurrence of postoperative pulmonary infection.

Objective:To understand the current situation of the ideological and political cognition of the postgraduate courses for the master degree of nursing and the analysis of the demand for the ideological and political curriculum of the community nursing, and provide preliminary experience for the integration of ideological and political elements into the teaching practice of community nursing.Methods:Using phenomenological research method, the semi-structured interviews were conducted with 15 full-time nursing master degree postgraduates from Tongji University in Shanghai. Colaizzi 7-step analysis was used to analyze the data.Results:Under the mode of curriculum ideological and political education, the cognition and needs of nursing master students can be summarized into four themes: the deficiency of curriculum ideological and political cognition, changes in professional cognition, recognition of the role and importance of curriculum ideological and political education, expectations and needs of community nursing curriculum ideological and political education.Conclusion:Nursing students with master′s degree have a vague understanding of "curriculum ideological and political". In the future, they can add diversified teaching methods starting from professional quality, humanistic care and patriotism education, so as to make the community nursing curriculum ideological and political concept more popular, and strive to cultivate senior nursing talents with both ability and morality.

In order to solve the problem of dust hazard of vibrating screen machine and difficult treatment in catalyst production process, computational fluid dynamics software Fluent was used to carry out numerical simulation calculation of the local exhaust dust removal system for the main dust dispersing points of the vibrating screen machine, including fine/coarse particles outlet and product outlet blowing and cleaning the dust points. The optimal design scheme and key technical parameters of local ventilation and dust removal system of vibrating screen machine were proposed. The results showed that the dust diffusion could be prevented by setting up an upper suction hood without air blowing, but the exhaust air volume needed to be calculated accurately. On the premise of purge, it is necessary to control the air volume to form a wind speed band of 8 m/s with a height of 15 cm at the feed port, so as to effectively remove the dust on the surface of solid particles of catalyst products and ensure that the catalyst products will not be blown away when falling into the feed barrel. The simulated design was applied to the vibrating sieve powder machine of a catalyst company, and the maximum dust concentration in the workplace was reduced from 45.80 mg/m 3 to 5.46mg/m 3, which effectively improved the working environment in the workplace.

Objective:To investigate the relationship between SNP and noise-induced hearing loss (NIHL) susceptibility in occupational noise exposure population in China.Methods:From 6297 for a certain steel works in contact with noise, contact length of 3 years or more and workplace noise exposure intensity of 80 dB (A) , ears or high frequency (3 000, 4 000, 6 000 Hz) average of hearing acuity 40 dB (HL) , or high frequency loss in both ears, on the basis of single whisper frequency (500, 1, 000, 2 000 Hz) average threshold of 26 dB (HL) or object as case group. A case-control study was designed with 1:1 matching. Subjects with the same gender, the same type of work, age ±5 years old, and working age ±2 years after noise exposure were selected as the control group. Subjects with any whisper frequency (500, 1, 000, 2, 000 Hz) whose hearing threshold in any frequency band was ≤25 dB (A) and whose average high-frequency hearing threshold in pure tone hearing test was <35 dB (A) were selected as the control group. Four sites of PON2 gene were genotyped by medium-and high-throughput SNP genotyping. Univariate logistic regression was used to analyze the relationship between single SNP polymorphism and NIHL.Results:A total of 286 case-control pairs were included. Smoking was statistically significant difference between cases and controls ( P<0.001) . Conclusion:No statistical difference has been found between single SNP polymorphism and NIHL. At the level of greater than 92 dB of high noise exposure, rs7785846 (CT+TT) genotype is a risk factor for occupational noise deafness, and its OR is 2.74 (95% CI: 1.09-6.89) compared with wild homozygous type (CC) . Conclusion. The rs7785846 (CT+TT) genotype carriers of PON2 gene are more susceptible to hearing impairment when exposed to high noise intensity.

Objective:To investigate the relationship between SNP and noise-induced hearing loss (NIHL) susceptibility in occupational noise exposure population in China.Methods:From 6297 for a certain steel works in contact with noise, contact length of 3 years or more and workplace noise exposure intensity of 80 dB (A) , ears or high frequency (3 000, 4 000, 6 000 Hz) average of hearing acuity 40 dB (HL) , or high frequency loss in both ears, on the basis of single whisper frequency (500, 1, 000, 2 000 Hz) average threshold of 26 dB (HL) or object as case group. A case-control study was designed with 1:1 matching. Subjects with the same gender, the same type of work, age ±5 years old, and working age ±2 years after noise exposure were selected as the control group. Subjects with any whisper frequency (500, 1, 000, 2, 000 Hz) whose hearing threshold in any frequency band was ≤25 dB (A) and whose average high-frequency hearing threshold in pure tone hearing test was <35 dB (A) were selected as the control group. Four sites of PON2 gene were genotyped by medium-and high-throughput SNP genotyping. Univariate logistic regression was used to analyze the relationship between single SNP polymorphism and NIHL.Results:A total of 286 case-control pairs were included. Smoking was statistically significant difference between cases and controls ( P<0.001) . Conclusion:No statistical difference has been found between single SNP polymorphism and NIHL. At the level of greater than 92 dB of high noise exposure, rs7785846 (CT+TT) genotype is a risk factor for occupational noise deafness, and its OR is 2.74 (95% CI: 1.09-6.89) compared with wild homozygous type (CC) . Conclusion. The rs7785846 (CT+TT) genotype carriers of PON2 gene are more susceptible to hearing impairment when exposed to high noise intensity.

Heat shock protein 27 (HSP27) is an important member of the heat shock protein family. In addition to its well-known chaperone function, recent studies have shown that it has been expressed in some malignant tumors. A large number of studies have shown that there is a significant correlation between HSP27 and thyroid carcinoma. This article reviews the research progress of HSP27 in thyroid carcinoma.