Study on the genotoxicity of HA/ZrO2 composite particles in vitro

To evaluate the genotoxicity of the HA/ZrO₂ composite particles by using the micronucleus test (MNT) in vitro. HA/ZrO₂ composite particles prepared by sintering at high temperature and pressure, that used powder of HA and ZrO₂ of different proportions, were compared with pure HA particles and pure ZrO₂ particles. The effect of the composite particles on cell proliferation of rabbit mesenchymal stem cells, and its the genotoxicity to rabbit mesenchymal stem cells were detected by MNT method. The MTT test showed that both pure HA particles and composite particles which contained HA promoted cell proliferation of rabbit mesenchymal stem cells, while pure ZrO₂ particles did not, and there was a significant difference (P < 0.05). The MNT test showed no significant difference between the HA group and the negative control group (P > 0.05), but a significant difference between the HA group and the positive control group (P < 0.05). The difference between the ZrO₂ group and the negative control group was significant (P < 0.01), while the difference between the ZrO₂ group and the positive control group was insignificant (P > 0.05). The genotoxicity of the HA/ZrO₂ composite particle increased with a higher proportion of ZrO₂ and an increase in the concentration of the composite, and the 30 wt.% HA/70% ZrO₂ composite with 200 μg/mL concentration showed significant genotoxicity (P < 0.01).     

刑事附带民事诉讼调解的现实困境及出路

分析公诉案件附带民事诉讼的调解工作面临的困境,论证了附带民事诉讼调解的轻刑化功能的正当性,提出了附带民事诉讼调解轻刑化的具体设想.     

微型涡旋式空气压缩机

涡旋压缩机是继活塞压缩机和螺杆压缩机之后的一种新型高效的流体机械。它是依靠加工精度很高且相互啮合的两个涡盘的相互运动而工作的,其中一个固定在机架上,称为静涡盘;另一个由偏心轴驱动绕静涡盘基圆中心平动,称为动涡盘,工作原理如图1所示。与其他容积式压缩机相比,涡旋压缩机具有许多不可替代的优越性。首先,它结构简单、体积小、重量轻,其主要零部件数量仅为往复式压缩机的1/10,体积减小约40%,重量减轻15%以上。其次,涡旋压缩机的吸气、压缩和排气过程是同时而且连续进行的,吸、排气腔不直接相邻,故泄漏较小,效率较高。压缩机工作腔…     

The effects of noradrenergic activation of the nucleus tractus solitarius on memory and in potentiating norepinephrine release in the amygdala.

Although it is known that norepinephrine (NE) modulates memory by acting on limbic areas, few studies describe how structures supplying NE to the limbic system such as the nucleus tractus solitarius (NTS) contribute to this process. The present study examined the effects on memory of activating the NE pathway between the NTS and the amygdala (AMYG). Rats received buffer or the β-noradrenergic agonist clenbuterol (CLN; 10, 50, or 100 ng/0.5 μl) into the NTS after footshock training in a Y-maze discrimination task. Infusion of 100 ng CLN significantly improved memory when retention was tested in the absence or presence of cues associated with the footshock. Experiment 2 used in vivo microdialysis to determine whether the mnemonic effects of CLN are mediated by influencing NE output in the AMYG. Subjects were given an intra-NTS infusion of CLN or phosphate buffered saline, footshock (0.8 mA, 1 s) and injected with epinephrine (EPI; 0.3 mg/kg ip) or saline. CLN or EPI injection produced a significant increase in NE sampled from the AMYG. These findings indicate that activation of NTS neurons that project to and release NE in the AMYG modulates memory storage processing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

第二代机器人控制器体系结构

本文讨论了第二代机器人控制器的设计及基于Transputer并行途径的实现.机器人新的应用要求和电子技术的进展推动机器人计算机体系结构向专用化亦即VLSI化方向发展.本文提出的机器人控制系统的设计体现了分层递阶结构的控制思想,并且选用了Inmos公司的TRANSPUTER作为研制该系统的主要元件.因此,该系统能够提供比已有结构更高的计算能力、可扩展性和灵活性.     

A Computer Model of Magnetic Saturation and Hysteresis for Use on SPICE2

Magnetic saturation and hysteresis are simulated on SPICE2 using a model containing two nonlinear controlled sources. The model is applied to inductors and transformers made from a variety of core materials, and procedures are given for determining the model parameters directly from magnetic core catalog data. Four examples of circuit applications are given: a saturating instrumentation transformer, a saturating snubber inductor, a ferroresonant regulator transformer, and a Royer saturation oscillator.     

Crowdsourcing large scale wrapper inference

Distributed and Parallel Databases - We present a crowdsourcing system for large-scale production of accurate wrappers to extract data from data-intensive websites. Our approach is based on...     

基于Seebeck效应的配电变压器绕组材质无损鉴别装置及测试分析

基于配电变压器绕组回路Seebeck效应,研发绕组材质鉴别装置并进行测试分析。结合实际情况分析了干式变压器绕组回路Seebeck效应。根据实际回路温度分布及绕组材料特性,对铜、铝绕组回路的热电势进行理论计算,得出了绕组材质判断阈值。基于理论研究成果研发变压器绕组材质鉴别装置,对多台配电变压器进行测试分析。测试结果证明该绕组材质鉴别装置能有效鉴别铜、铝绕组材质。     

注塑机拉杆与模板的有限元分析

注塑机拉杆和模板是重要的承载零件,易因设计不良而发生早期断裂或出现裂纹的现象。本文采用整体有限元分析方法对肘杆式注塑机的拉杆和模板进行应力分析,并就分析结果对注塑机拉杆与模板的设计提出了改进措施。     

Collaborative Passivation for Dual Charge Transporting Layers Based on 4-(chloromethyl)benzonitrile Additive toward Efficient and Stable Inverted Perovskite Solar Cells

Poor carrier transport capacity and numerous surface defects of charge transporting layers (CTLs), coupled with misalignment of energy levels between perovskites and CTLs, impact photoelectric conversion efficiency (PCE) of inverted perovskite solar cells (PSCs) profoundly. Herein, a collaborative passivation strategy is proposed based on 4-(chloromethyl) benzonitrile (CBN) as a solution additive for fabrication of both [6,6]-phenyl-C61-butyric acid methylester (PCBM) and poly(triarylamine) (PTAA) CTLs. This additive can improve wettability of PTAA and reduce the agglomeration of PCBM particles, which enhance the PCE and device stability of the PSCs. As a result, a PCE exceeding 20% with a remarkable short circuit current of 23.9 mA cm⁻², and an improved fill factor of 81% is obtained for the CBN- modified inverted PSCs. Devices maintain 80% and 70% of the initial PCE after storage under 30% and 85% humidity ambient conditions for 1000 h without encapsulation, as well as negligible light state PCE loss. This strategy demonstrates feasibility of the additive engineering to improve interfacial contact between the CTLs and perovskites for fabrication of efficient and stable inverted PSCs.