Trench insulated gate bipolar transistor - a high power switching device

This paper presents a comprehensive theoretical study of the Trench Insulated Gate Bipolar Transistors (TIGBT). Specific physical and geometrical effects, such as the accumulation layer injection, increased channel density, increased channel charge and transversal electric field modulation are discussed. The potential advantages of the Trench IGBT over its conventional planar variant are highlighted. It is concluded that the Trench IGBT is one of the most promising structures in the area of high voltage MOS-controllable switching devices.

Dual-mode thin film bulk acoustic wave resonators for parallel sensing of temperature and mass loading.

Thin film bulk acoustic wave resonator (FBAR) devices supporting simultaneously multiple resonance modes have been designed for gravimetric sensing. The mechanism for dual-mode generation within a single device has been discussed, and theoretical calculations based on finite element analysis allowed the fabrication of FBARs whose resonance modes have opposite reactions to temperature changes; one of the modes exhibiting a positive frequency shift for a rise of temperature whilst the other mode exhibits a negative shift. Both modes exhibit negative frequency shift for a mass load and hence by monitoring simultaneously both modes it is possible to distinguish whether a change in the resonance frequency is due to a mass load or temperature variation (or a combination of both), avoiding false positive/negative responses in gravimetric sensing without the need of additional reference devices or complex electronics.

Dual-mode thin film bulk acoustic wave resonators for parallel sensing of temperature and mass loading

Thin film bulk acoustic wave resonator (FBAR) devices supporting simultaneously multiple resonance modes have been designed for gravimetric sensing. The mechanism for dual-mode generation within a single device has been discussed, and theoretical calculations based on finite element analysis allowed the fabrication of FBARs whose resonance modes have opposite reactions to temperature changes; one of the modes exhibiting a positive frequency shift for a rise of temperature whilst the other mode exhibits a negative shift. Both modes exhibit negative frequency shift for a mass load and hence by monitoring simultaneously both modes it is possible to distinguish whether a change in the resonance frequency is due to a mass load or temperature variation (or a combination of both), avoiding false positive/negative responses in gravimetric sensing without the need of additional reference devices or complex electronics. © 2012 Elsevier B.V.

饵料中类雌激素对稀有鮈鲫体内VTG的诱导

利用卵黄蛋白原(VTG)作为生物标志物评价了两种不同饵料(污水处理厂采集的水蚯蚓和丰年虫)喂养对稀有鮈鲫的雌激素效应。结果显示:饵料喂养15 d后,饲喂水蚯蚓组幼鱼体内VTG含量要显著高于饲喂丰年虫组。因此,在毒理学实验中,实验模型鱼的饵料选择对实验结果的准确保证是至关重要的。

武汉后湖长角涵螺的周年生产量

采用两种方法对后湖长角涵螺(Alocinma longicornis)的周年生产量进行了测算,结果表明,两种方法得到的生产量较为吻合.生产量的带壳湿重和去壳干重分别是:体长频率法,2.22 g/(m2·a),0.111 g/(m2·a);瞬时生长率法,2.177 g/(m2·a),0.109 g/(m2·a).对应的P/B系数为4.0,5.4.

环境胁迫对鱼类免疫系统影响的研究概况

<正> 环境胁迫(environmental stress)是指环境对鱼类所处的生存状态产生的压力,可以分为急性环境胁迫和慢性环境胁迫。捉捞(handling)和干扰(disturbance)等引起急性环境胁迫,而水质逐渐恶化和高密度放养等造成慢性胁迫。随着世界人口的增长和消费水平的提高,世界渔业也得到了长足的发展。但与此同时,由于人类活动范围的扩大、程度的加深,

从我国分离的3株蛙虹彩病毒与蛙病毒3型主要衣壳蛋白基因同源性的比较

中国科学院王宽诚基金 ( 1999) ; 中国科学院生物特支费 (STZ -0 0 -13); 国家重点基础 ( 973)项目 (G19990 5 390 8)基金的部分资助

氯霉素在草鱼和复合四倍体异育银鲫体内的比较药代动力学

研究并比较了给草鱼和复合四倍体异育银鲫（简称高倍体鲫鱼）单次腹腔注射氯霉素１００ｍｇ／ｋｇ后的药代动力学特征。采用ＨＰＬＣ测定血液中氯霉素的浓度。试验期间水温为（２０±２）℃。结果表明，氯霉素在这２种鱼体内的处置过程相似，均可用带一级吸收的二室开放模型进行描述；药物从腹腔吸收迅速，给药后分别在０．９２ｈ和０．６３ｈ血中浓度达到高峰，无吸收时滞；在草鱼和高倍体鲫鱼体内药物的ｔ１２β相近，分别为１１．９ｈ和１１．１ｈ，但体清除率（ＣｌＢ）相差较大；氯霉素在高倍体鲫鱼体内比在草鱼体内有更强的亲组织性，总表观分布

中国鼓藻目新资料

本文报道浙江省东钱湖和西湖鼓藻目8个属的1个新种、3个新变种、20个中国新记录种及变种。

中国隆背溞属（甲壳纲：双甲目）一新记录

描述了中国隆背　属的一新记录，补充了属的特征并编制了本属的分种检索表。