Objective To evaluate the effect of Tai Chi exercise on cognitive function of the aged.Methods Searched China National Knowledge Infrastructure database,Wanfang data knowledge service platform,Chongqing VIP Chinese science and technology periodical database,China biomedical literature database,PubMed,The Cochrane Library and Embase.Collected the clinical research literature in which the elder population practiced Tai Chi and cognitive function outcomes were researched.Conducted Cochrane bias risk assessment.Conducted systematic review and Meta-analysis for the effective information.Results Included 8 randomized controlled trials in total.All studies were described as random,but only two studies described the random method,with one study with blinding.The overall methodological quality was low.Meta-analysis results showed that,the cognitive function outcome evaluation in the aged with cognitive function defect,the overall cognitive function [MD =0.91,95％ CI (0.37,1.46),I2=0,P=0.001],language fluency [MD=2.17,95％CI (0.88,3.45),I2=0,P＜0.001] and delayed recall test [MD =0.7,95％ CI (0.29,1.11),I2 =0,P ＜0.001] evaluation in the Tai Chi group were significantly better than that in the control group,with no significant improvement in memory span [MD =0.16,95％ CI (-0.14,0.45),I2 =55 ％,P =0.30].In the outcome indicators evaluation of the healthy elder people,the overall cognitive function evaluation [MD =0.7,95％ CI (0.11,1.29),P =0.02] in the Tai Chi group was significantly better than the control group.In language fluency evaluation [MD =0.32,95％ CI (0.01,0.64),I2 =0 P =0.05],the difference was not statistically significant,but there is a potential advantage;in evaluation of execution of test line A (TMT-A) [MD =1.53,95％ CI (0.1,2.96),I2 =26％,P =0.04],the Tai Chi group was better than the control group;in evaluation of execution of test line B (TMT-B) [MD =1.24,95％CI (-5.20,7.67),I2 =94％,P =0.71] the difference between the Tai Chi group and the control group was not significant.Conclusion Tai Chi could effectively improve cognitive function of the healthy elder people and those with cognitive impairment.

Objective: To Investigation of industrial sites involving coal tar pitch to detect PAHs in the occupational environment and to assess their occupational health risks to workers. Methods: Taking coal tar pitch enterprises as the research object, and making the occupational health field investigation and inspection. Detecting the 16 PAHs in the samples by high performance liquid chromatography (HPLC) , analyze the PAHs exposed dose of the workers in the place, and using cumulative toxic equivalent quantity method, loss of life expectancy method and carcinogenic risk factor method to assessment worker's occupational health risk. Results: In the 15 posts involved, Some workers' exposed to the total concentration of PAHs is higher than others, the maximum exposure concentration is 1931.45ng/m3. There are different hazard risk levels in different working post due to different processes.The lifetime risk of workers is significantly higher than the acceptable range. Some workers has higher carcinogenic risk and workers' life expectancy loss is up to 1033.95 hours. Conclusion Part of the coal tar pitch workers exposed to higher concentrations of PAHs, and beyond the occupational exposure limits.And there is a high occupational health risk due to high exposure to PAHs.

OBJECTIVE: To compare the occupational health risk assessment results of 3 risk assessment methods in workers exposed to methyl isoamyl ketone(MIAK). METHODS: A rubber antiaging agent manufacturer and its workers in Shandong Province were selected as study subjects. An on-site occupational health survey was conducted and MIAK levels in workplace detected. We chose Romania occupational accidents and occupational disease risk assessment method(hereinafter referred to as “the qualitative assessment method”), Singapore harmful chemicals contact ratio method occupational exposure to risk assessment(hereinafter referred to as the “half-quantitative assessment method”) and the occupational hazards risk index method to conduct occupational health risk assessment for MIAK exposure in workers in the enterprise, and use risk ratio method to compare the results of the 3 different risk assessment methods at the same time. RESULTS: All the results of qualitative assessment method on the risk grade of inspectors, dose inspectors, recovery inspectors in the production workshop, laboratory analysts and warehouse keepers were grade 2. The results of semi-quantitative assessment method on the risk ratio of inspectors, dose inspectors, recovery inspectors in the production workshop were grade 2, while the risk ratios of laboratory analysts and warehouse keepers were grade 1. The assessment result of occupational hazard risk index method on the risk level of inspectors in the production workshop was grade 4, and the assessment results of dose inspectors, recovery inspectors in the production workshop, laboratory analysts and warehouse keepers were grade 3.CONCLUSION: Compared with the qualitative assessment method and the semi-quantitative assessment method, the occupational hazard risk index method has a higher risk ratio of occupational health risk of MIAK and the assessment results were relatively more comprehensive, reasonable and objective.

Objective: To understand the status of occupational health surveillance for workers on offshore platforms. Methods: The research period was from 2014 to 2016. From 2014 to 2016, a cross-sectional survey method was adopted to select 429 people for offshore oil production, drilling and operation platforms and their first-line workers to conduct workplace occupational hygiene. Investigation, occupational hazard factor testing, occupational health check of workers, collation and statistical analysis of surveys and test data, and comparison of occupational health surveillance among workers of different types of offshore platforms. Results: From 2014 to 2016, the results of chemical harmful factors detection of occupational diseases in the offshore platform were in line with the national occupational health exposure limit requirements. The noise of some platform posts exceeded the standard, such as: oil platform oil, oil and oil and gas processing workers, diesel engines for drilling and working platforms. Worker noise exceeds national occupational health limits p[L_{ex, 8 h}>85 dB(A)].There was a statistically significant difference in the occupational health of workers on the same platform with the age and length of service (P<0.05). Conclusion Workers on different platforms at sea may be subject to different levels of occupational health damage, and the occupational hazards brought by noise to platform workers are particularly prominent.