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Background Accumulating data have reported that GSTM1 polymorphism may be related to nasopharyngeal cancer (NPC) and laryngeal cancer (LC). This meta-analysis was performed to investigate the relationship between GSTM1 polymorphism and risks of NPC and LC. Methods Pubmed, Embase, and China National Knowledge Infrastructure (CNKI) databases were searched for potential articles. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to evaluate the relationship of GSTM1 polymorphism with the risks of NPC and LC. I2>50% or P

By placing the thermocouples inside the steel plate and measuring the actual temperature in the normalizing process, combined with the numerical calculation, the temperature variation law of different thickness steel plate is simulated and calculated. The calculation shows that the core cooling rate is the lowest at the beginning of cooling. With the decrease of temperature, the cooling rate changes and then continues to decrease. The maximum cooling rate is 0.53°C/s-0.35°C/s. When the plate surface temperature reaches 642°C-673°C, the cooling rate of steel plate surface is consistent with that of core.

The FEM model of temperature field was built using FEM soft of ANSYS according to flash butt welding parameters: the amount of burnt the time of burnt and the velocity of burnt which come from four manufacturing vehicle wheels factories. Then the heat affected zone width of four factories was analyzed, as a result that the higher of the velocity of burnt, the narrower of the heat affected zone width, consequently, the guidance of flash butt welding parametres can be offered to manufacturing vehicle wheels factories.

Fengying Zhang,1,* Xijiang Wu,2,* Jinming Niu,1 Xiufeng Kang,3 Liya Cheng,1 Yanchun Lv,1 Meimei Wu1 1Otorhinolaryngological Department, Wei Fang Traditional Chinese Hospital, Weifang, Shandong Province, China; 2Otorhinolaryngological Department, Shouguang Peoples Hospital, Shouguang, Shandong Province, China; 3Medical insurance office, Shouguang Peoples Hospital, Shouguang, Shandong Province, China *These authors contributed equally to this work Background: Accumulating data have reported that GSTM1 polymorphism may be related to nasopharyngeal cancer (NPC) and laryngeal cancer (LC). This meta-analysis was performed to investigate the relationship between GSTM1 polymorphism and risks of NPC and LC. Methods: Pubmed, Embase, and China National Knowledge Infrastructure (CNKI) databases were searched for potential articles. Odds ratios (ORs) and 95% confidence intervals (CIs) were used to evaluate the relationship of GSTM1 polymorphism with the risks of NPC and LC. I2>50% or P

With the exploitation of gas mixed with sulfur, the requirement of hydrogen induced cracking (HIC) resistance for medium carbon vessels serving at environmental with hydrogen sulfide solution become more rigorous. Through the research on HIC, the formation reasons of those are: MnS inclusions, Al2O3 inclusions, P segregation, Bainites and Macro segregation of slab. Thus if these parameters are controlled appropriately, the qualified medium carbon vessels for resistance to HIC steel will be produced. The conclusions are following: the controlled measurements to cleanliness on liquid steel, macro segregation controlled on slab, large reduction at rolling and normalizing are used to produce the HIC resistance vessels. The properties of tensile strength and low temperature impact meet the standard properly. Meanwhile there aren’t hydrogen induced cracking found in any samples.