Using geometry principle of the spiral CT localization , functional relation was deduced between the bed coordinates and the diagram layers coordinates, i.e.when gantry angle is zero degree, the function relation type is Twm= S190/Cos? + M; Otherwise, it is Twm= S190/Cos? +M. Combined with the actual operation of CT localization, the formula of the CT localization is:Twm=S190/Cos?+M. Finally, the physical meaning and the simplified condition of the formula were discussed.

Objective: To investigate the incidence of occupational diseases in Chongqing, China, from 2006 to 2014, and to analyze the harm, features, and trend of occupational diseases in Chongqing. Methods: The data of new cases of occupational diseases from 2006 to 2014 were collected, and the patients with a confirmed diagnosis of occupational diseases were selected as study subjects to analyze the incidence of occupational diseases in Chongqing. Results: There were 17499 cases of occupational diseases in total in Chongqing from 2006 to 2014. Among these patients, 17124 (97.86%) were male, most of whom (95.40%) had occupational pneumoconiosis, and 375 (2.14%) were female, most of whom (72.80%) had occupational chemical poisoning. There were 16400 cases (93.72%) of occupational pneumoconiosis in total, mainly coal workers' pneumoconiosis (55.87%) and silicosis (43.02%) , and the main industries involved were coal mining and washing, railway transport equipment manufacturing, and mining and washing of bituminous coal and anthracite. There were 724 cases of occupational poisoning in total; there were 281 cases of acute occupational poisoning, mainly gas poisoning (39.86%) and carbon monoxide poisoning (33.10%) ; there were 443 cases of chronic occupational poisoning, mainly poisoning caused by benzene (47.63%) , mercury and its inorganic compounds (32.74%) , and lead and its inorganic compounds (9.03%) . Conclusion Occupational diseases in Chongqing are mainly occupational pneumoconiosis, and occupational health supervision should be enhanced in the industries of coal mining and washing and railway transport equipment manufacturing to protect workers’ health.

Objective : To investigate the role of lncSIL in transforming growth factor-β1(TGF-β1)-induced alveo- lar epithelial interstitial transformation (EMT) and its related signaling pathways . Methods : Western blot was used to detect the effect of lncSIL silencing on the expression of E-cadherin ( E-cad) , alpha-smooth muscle actin ( α- SMA) and Collagen I (Col I) in the process of EMT induced by TGF-β1 . LncSIL interacting proteins were ana- lyzed by RNA pulldown . Western blot was used to detect the effect of overexpression or silencing of lncSIL on the expression of its target gene enhancer of zeste homolog 2 (EZH2) and its downstream factors P21 and cyclin-de- pendent kinase 6 (CDK6) . Flow cytometry was used to analyze the effect of lncSIL on cell cycle progression . Results: After lncSIL silencing , the expression of α-SMA and Col I increased , the expression of E-cad decreased . RNA pulldown assay showed that EZH2 was the target protein that interacted with lncSIL , and the expression of EZH2 increased after silencing lncSIL , the expression of EZH2 downstream gene P21 decreased , CDK6 increased . Flow cytometry showed that the number of cells in S phase significantly increased . When lncSIL was overexpressed , the expression of EZH2 and CDK6 was down-regulated , the expression of P21 was up-regulated , and the number of S phase cells significantly decreased . Conclusion LncSIL inhibits TGF-β1-induced alveolar epithelial cell mesen- chymal transition by negatively regulating EZH2/P21 /CDK6 signaling pathway to inhibit cell cycle progression .