一种功率晶体管自适应基极驱动原理

研究了采用微分变压器实现理想的隔离耦合,探测集电极电压实施运行监控与脉宽限流式保护;采用“贝克箝位”的原理实现临界饱和状态工作,探测输出电流的变化率,预报大电流的出现,实现无延迟的速断保护与短路运行,同时给出了GTR理想的基极驱动电流的一种自适应的基极驱动的原理电路.     

伯努利方程求解公式

本文使用全微分法和常数变易法,从不同角度给出伯努利方程通解的公式.     

牦牛群体血清运铁蛋白位点遗传分化的探讨

根据中国，蒙古，前苏联等３国９个牦牛地方品种（类群）血清运铁蛋白位点的基因频率，探讨了各牦牛群体的遗传分化程度，结果表明，血清运铁蛋白各等位基因频率在不同的牦牛群体中，具有明显的种群特异性，中国牦牛品种（类群）间遗传分化程度大，而蒙古牦牛品种（类群）间遗传分化程度较低，这反映了牦牛起源进化上的差异。     

薏苡花序形态及分化的研究

本文研究了薏苡的花序形态及其分化的过程。观察到薏苡可育雌小穗有两花均结实、雌蕊有三个柱头及雄穗有结实(无壳)的现象。将其穗分化过程划分为五个主要时期。     

“古文”“古文字”与“古汉字”辨析

对“古文”“古文字”“古汉字”这一组汉字学术语的使用情况进行了分析和辨别,并在此基础之上分别给这几个术语进行了定义,希望能够有助于消除以往的一些错误认识,正确地使用相关术语。     

Acylphosphatase overexpression triggers SH-SY5Y differentiation towards neuronal phenotype

An acylphosphatase (AcPase) overexpression study was carried out on SH-SY5Y neuroblastoma cells, using a green fluorescent fusion protein (AcP-GFP), with GFP acting as a reporter protein. The cellular proliferation rate was significantly reduced by overexpression of AcPase by a factor of ten. In contrast, clones transfected with two inactive AcPase mutants showed a growth rate comparable to control cells. This suggests that AcPase catalyzes the proliferative down-regulation. AcPase-overexpressing clones showed a physiological mortality rate as assessed by an MTT reduction test and by evaluation of necrotic markers. DNA fragmentation analysis and assays of caspase-3 and poly (ADP-ribose) polymerase (PARP)-active fragments showed no evidence of any apoptotic pattern. AcPase overexpression led to a marked increase in PARP activity as well as Bcl-2 content; these are commonly up-regulated during differentiative processes in neuronal cells. In fact, the typical differentiation marker, growth-associated-protein 43, was significantly up-regulated. Microscopic observations also showed a clear increase in the differentiative phenotype in AcPase-overexpressing cells. Our results clearly show that AcPase plays a primary causative role in neuronal differentiation.Received 3 May 2004; accepted 25 May 2004     

复杂性与社会分化——卢曼社会系统理论研究

在卢曼看来,社会系统总是处于极端的复杂状态,同时也处于一种复杂化的过程之中。系统的复杂性征使其在面对环境的影响时,出现各种内在的危机和各种不平衡现象,并产生一系列的运作难题,使社会系统无法以其原来对付环境的原则进行实际运作,迫使社会系统不断地进行复杂性的化约和自我的区分化以化解危机,而社会系统也在此一过程中实现自身的演化和进化。     

Principle, traits and functions of electrochemical fingerprint of Chinese traditional medicine

In regard to such challenging analysis problems as scientific identification and quality evaluation of Chinese traditional medicine, the electrochemical fingerprint technique of Chinese traditional medi- cine has been researched. The principle, traits, functions, etc., of the electrochemical fingerprint have detailedly been analyzed and discussed by the B-Z oscillatory system using malonic acid as main dissipation substance, characterized by the fact that different influences of different Chinese traditional medicines on the mechanism of the oscillatory reaction cause different changes of the shape of the potential-time curve of the oscillatory system under the conditions of constant tem- perature and pressure. An economical, simple and convenient, easy pushing and effective scientific method for distinguishing and evaluating multifarious Chinese traditional medicines has success- fully been put forward.