Search

Dibutyl phthalate (DBP), an accepted environmental endocrine disrupting compound, which has anti-androgenic effects,is widely used in many industries such as plastics, pharmaceuticals, plastic food packaging materials. This article intends to study the effect on JNK/MAPK pathways in the damage of rat testicle sertoli cells induced by DBP via vitro test. Testicular sertoli cells of rates were incubated by medium containing DBP in different concentrations (0μg/ml,1μg/ml,10μg/ml, 100μg/ml). after culturing for 24 hours the expression of vimentin was detected by immunofluorescence; the expression of vimentin mRNA detected by RT-PCR; Western blot analyzed the expression of related protein of JNK/MAPK pathways in sertoli cells. The results showed that vimentin highly express in sertoli cells and gradually decrease with the increase of poisonous doses. The mRNA expression of vimentin in each exposure group has a downtrend with the increase of does. The total protein of JNK and P-JNK protein increased gradually in a dose effect manner. These results suggested that DBP can decrease the expression of vimentin mRNA, the decrease of which was regulated by JNK/MAPK signal transduction pathway that activated by DBP, and then induced the apoptosis of Sertoli cell.

The present work dealt with the fatigue and residual stress (RS) effects of a soft buffer layer (BL) between the parent metal and the weld metal (WM) on welded high-strength low-alloy (HSLA) steel. Six strategies were pursued by varying BL thickness and changing U-notch position with respect to the WM in extended-compact tension specimen. The U-notch position was changed to study the effect of welding RS field, acting along the fatigue crack growth path. The welded HSLAs with BLs strategies were compared to the specimens without BLs strategies, before and after releasing RS respectively. The results demonstrated that the incorporation of a thin BL of 4 mm significantly reduced the fatigue crack growth rate (da/dN) when the RS in the welded HSLA was released by machining a U-notch in the WM. A thick BL of 10 mm was found to be beneficial to fatigue resistance when a U-notch was in the PM.

This article is based on China's Gansu Jiuquan areas of natural environment,in view of field operations commonly used wild barrack winter heating requirements,design the solar energy storage and auxiliary electrical heating heating system,and the flat collector to use double working medium indirect heating mode,with antifreeze as collection hot flowing,with water as storage and heating medium,effectively solved the extreme temperatures anti-freeze、guard against sandstorm problem,achieve the safe、energy-saving and environmental protection heating goal.

Based on the natural environment of YuMen oilfield, we designed solar collector and auxiliary power heating system. We lay great emphasis on the area of the collector , auxiliary electrical heating power,the volume of water tank and pipeline design in this system. After being used, this system warmth achieves the expected effect and meets the requirement of heating in severe condition such as Yumen in china.

The tension-torsion thin walled tube specimens were used as the researching object in this paper. The method of determination to the critical plane which has the maximum normal strain and maximum shear strain was expounded. The strain state on the critical plane under non-proportional loading was analyzed, and the unified prediction model was used to calculate the fatigue life. In order to research the influence of phase difference on fatigue life under the non-proportional loading, the relation of the equivalent strain and the phase difference in different positive strain amplitude and different strain amplitude ratio were analyzed. It’s found that the dangerous phase difference which has the shortest fatigue life is in direct relation with the strain amplitude ratio. The general formula of dangerous phase difference is presented. Through the material mechanics performance and fatigue parameters of uniaxial stress state, the coefficients in the formula can be obtained and the coefficients of 15 kinds of common materials are given for practical application.

FASH160KE profiling machine manufactured in Germany is imported by our company in the late 1970s. The electrical element of this equipment is seriously ageing. What is worse, there have no substitution for AC drive, which will cause speed could not be regulated. Besides, the function of hydraulic pressure copying is beyond repair. We make CNC system reforming for this machine by using SINUMERIK 802D CNC and MICROMASTER-440 transducer. The wireless communication system

This article that based on the communication technology of 2.4G global free frequency range adopts technical route which can stabilize and reliable work in high—intensity magnetic field and other disturb spot acquisition of signal technology. The technical route is that collecting the spot signal and making the wireless communication, then restoring the signal to logging. The modern information communication in oil log will come true through this process. This technology not only overcome many malpractice which exist in the wired communication but also allow the logging cabin far from well site, which both reduce the cost of logging and improve the work efficiency

Magnesium reduction Jar can be critical, consumable parts in magnesium reduction process, this paper Introduced the working environment and the common failure modes of magnesium reduction can, based on the failure can cause magnesium reduction, presents a The new structure, developed a new material, and magnesium can restore the original structure was modified, the use of new casting technology to produce a good magnesium reduction tank.

The detritus of drilling well carry the important information of stratum, which is the important basis for discovering and evaluating oil and gas layer. So it is important to get detritus from the viscous drilling mud. In this paper, it studies the technology of cleaning detritus. According to the requirements of cleaning process and water - saving on the drilling well spot, DF - Windspout separator cleaner is designed, which is used to clean detritus. The mixture of viscous drilling mud and the detritus are accelerated through the double fluid (DF) system. Then they go into the windspout separation, they are separated to fluid and solid at here. Next the fluid is purified by ultrasonic microfiltration plant. The water can be recycled again. It can ensure the clean debris, the accuracy of collecting debris, accurate, remove the fake block and solves the lack of the dis - continuity of sampling.