石油化工企业化验工人职业健康现状调查

目的了解石油化工企业化验工人职业健康现状,为化验室分析工作人员身心健康改进措施提供依据。方法抽取石油化工企业化验工人的职业健康检查报告、职业卫生检测与评价报告,进行分析评价。结果化验工人血常规异常检出率为7.4%,不同接触时间的检出率差异有统计学意义,职业病危害因素检测合格率为91.5%,通风橱通风效果合格率为93.5%,通风橱规范使用率为53.3%,防毒面具配备率占72.3%,滤毒盒型号符合率为84.7%,佩戴率为57.2%。结论石油化工企业化验工人接触时间越长,工龄越长,白细胞减少检出率越高。加强通风效果可有效降低化验室内有机溶剂的浓度。

Peptic ulcer and childhood adversities experienced by working-aged people

AIM: To study the association between self-reported peptic ulcer and childhood adversities.METHODS: The Health and Social Support Study (HeS-Sup) population consisted of a stratif ied random sample drawn from the Finnish Population Register in four age groups: 20-24, 30-34, 40-44 and 50-54. The survey was carried out by postal questionnaire during 1998, with a response rate of 40.0%. A follow-up questionnaire was sent during 2003 to all those who responded to the f irst. Altogether 19 626 individuals returned the follow-up questionnaire; a response rate of 75.8%. The subjects were asked whether a doctor had told them that they have or have had peptic ulcer. The analyses covered those who responded aff irmatively to both the baseline and the follow-up enquiries (n = 718). Those not re-porting a peptic ulcer in either of the two questionnaires (n = 17 677) were taken as controls. The subjects were further requested (through six questions) to think about their childhood adversities.RESULTS: The most common adversities mentioned were long-lasting financial difficulties in the family, serious conflicts in the family, and a family member seriously or chronically ill. All the adversities reported, except parental divorce, were more common among peptic ulcer patients than among controls (P values varied between < 0.001 and 0.003). Age- and sex-adjusted odds ratios (OR) of childhood adversities in the multivariate logistic analysis for self-reported pep-tic ulcer varied between 1.45 and 2.01. Adjusting for smoking, heavy drinking, stress and nonsteroidal anti-inflammatory drug use had no further influence (ORs between 1.22 and 1.73).CONCLUSION: Our findings suggest that childhood adversities maintain a connection with and have a predictive role in the development of peptic ulcer.

Verifying Fossil-Fuel Carbon Dioxide Emissions Forecasted by an Artificial Neural Network with the GEOS-Chem Model

In this study, the authors developed an en- semble of Elman neural networks to forecast the spatial and temporal distribution of fossil-fuel emissions （ff） in 2009. The authors built and trained 29 Elman neural net- works based on the monthly average grid emission data （1979-2008） from different geographical regions. A three-dimensional global chemical transport model, God- dard Earth Observing System （GEOS）-Chem, was applied to verify the effectiveness of the networks. The results showed that the networks captured the annual increasing trend and interannual variation of ff well. The difference between the simulations with the original and predicted ff ranged from -1 ppmv to 1 ppmv globally. Meanwhile, the authors evaluated the observed and simulated north-south gradient of the atmospheric CO2 concentrations near the surface. The two simulated gradients appeared to have a similar changing pattern to the observations, with a slightly higher background CO2 concentration, - 1 ppmv. The results indicate that the Elman neural network is a useful tool for better understanding the spatial and tem- poral distribution of the atmospheric C02 concentration and ft.

Paint-bake response of AZ80 and AZ31 Mg alloys

Aging behaviors of extruded and rolled AZ80 and AZ31 Mg alloys were investigated under conditions similar to the paint-bake cycle currently used in automotive industry.Artificial aging at 170℃ from 0.5 to 12 h was conducted on solution-treated specimens to study the effects of aging on mechanical properties.SEM observations and EDS data show thatβ-phase of Al12Mg17 precipitates continuously or discontinuously fromα-Mg matrix and distributes along grain boundaries of the AZ80 alloy during artificial aging.Data of tensile tests and Vickers hardness tests show that an optimum mechanical property is achieved after baking at 170℃ for 6-8 h when Vickers hardness,tensile strength,and elongation are increased by 6.35%,15.30%,and 7.88%,respectively, while the AZ31 alloy does not exhibit significant hardening behavior over the aging period.

Community Endowment Service Supply of the Third Sector to Participate in Research in China

Under the background of population aging, unilateral by the government mode of community endowment service more and more cannot satisfy the require of the elderly, and community as working platform, the third sector participation, in situ solve the problem of the community elderly, multivariate supply of the community elderly service mode gradually. The purpose of this paper is to research and practice experience at home and abroad, based on the literature method, interdisciplinary study, induction, etc on the current situation of the third sector to participate in community service, in order to understand and grasp the third sector in the form of participation in community endowment service as well as the advantages and disadvantages. Finally gives the countermeasures and Suggestions, to promote third sector to actively participate in community endowment services, promote social endowment service system construction in China.