摘要：Due to their special anatomical and physiological features,central nervous system diseases still presented challenges,despite the fact that some advances have been made in early diagnosis and precision *** of the complexities in treating tumors is the tumor microenvironment,which includes mesenchymal stem cells(MSCs)that exhibit tumor tropism and can be used for cell ***,whether MSCs promote or suppress gliomas is still unclear,especially in glioma *** this study,a coaxial microfiber was designed to mimic the tumor microenvironment and to reveal the effect of MSCs on glioma *** fiber shell was composed of MSCs and alginate,and the core was filled with U87 MG(glioblastoma)cells and gelatin *** Shell-MSC/Core-U87 MG microenvironment improved the proliferation,survival,invasion,metastasis,and drug resistance of glioma cells,while simultaneously maintaining the stemness of glioma *** summary,coaxial extrusion bioprinted Shell-MSC/Core-U87 MG microfiber is an ideal platform for tumor and stromal cell coculture to observe tumor biological behavior in vitro.

摘要：The high pressure waves generated due to muzzle blast flow of tank gun during firing is a critical issue to examine. The impulsive noise from the gun has various negative effects such as damage of human bodies, damage of structures, creating an environmental, social problem and also military problems such as exposure of location of troops. This high pressure impulsive sound, generated during the blast flow, was studied and attenuated. An axisymmetric computational domain was constructed by employing Spalart Allmaras turbulence model. Approximately 90% of pressure and 20 dB of sound level are reduced due to the use of the three baffle silencer at the muzzle end of the gun barrel, in comparison with the tank gun without silencer. Also, the sound pressure level at different points in the ambient region shows the same attenuation in results. This study will be helpful to understand the blast wave characteristics and also to get a good idea to design silencer for large caliber weapon system.

摘要：二基于硅紫外(紫外) 并且扩大蓝色的光电二极管被介绍，它为轻察觉被制作在紫外 / 蓝光谱范围。塑造条纹、八边形圆形的结构被设计验证 UV-responsivity 的参数，紫外选择，故障电压，和反应时间。极端浅的侧面的 pn 连接成功地在标准 0.5-m 被认识到扩大 pn 连接区域，提高紫外光的吸收，并且改进 responsivity 和量效率的互补金属氧化物半导体(互补金属氧化物半导体) 过程。说明的测试结果塑造条纹的结构有更低的故障电压，更高的 UV-responsicity，并且更高紫外选择。但是八边形圆形的结构有更低的黑暗电流。两结构的反应时间是几乎一样。

摘要：Based on the D-H notation, kinematics model and inverse kinematics model of 6R industrial robots are established. Using graphical method, the boundary curve equations of the 6R industrial robot workspace are obtained. Based on the prescribed workspace, the D-H parameter optimization method of 6R industrial robots is proposed. Using the genetic algorithm to determine the structural dimensions of a 6R robot, we make sure that its workspace can exactly contain the prescribed workspace. This method can be used to reduce the overall size of the robot, save materials and reduce the power consumption of the robot during its work time.

摘要：A new experimental device has been developed for analyzing compression load deflection of the door seal by using stereovision theory. precision instruments of optical grating and force sensor are also integrated in this device. Force-displacement response characteristics of compression at varied speed can be controlled. Solid foundations for characteristic and structure as well as optimization design of the car door seal are elucidated.