不同60Coγ剂量率下10位双极D/A转换器的总剂量效应

为探索电离辐射对数模混合电路的影响，对国产10位双极D/A转换器在60Coγ射线不同剂量率辐照下的电离辐射效应及退火特性进行研究。结果表明：D/A转换器对辐照剂量率十分敏感，在大剂量率辐照时，电路功能正常，各功能参数变化较小;在低剂量率辐照下，各参数变化显著，电路功能出现异常，表现出明显的低剂量率损伤增强效应。最后，结合空间电荷模型对其电离辐射损伤机理进行了初步探讨。     

Creative mythconceptions: A closer look at the evidence for the "mad genius" hypothesis.

Many people believe that the “mad genius” notion, which has been a favorite cultural fixture for centuries, is based on established scientific fact. Much of the evidence for the connection between great creativity and great pathology, particularly affective disorder, comes from the writings of psychiatrists Nancy Andreasen and Arnold K. Ludwig and psychologist Kay Redfield Jamison. For two decades, their studies and books have been widely referenced in both the popular and professional press without critique or comment and often without much detail, suggesting that few people have spent much time with the originals. This article examines their most influential works, encouraging readers to evaluate this evidence for themselves, because the author believes that many of their claims have had unfortunate implications for the perception of creativity and the credibility of psychological research in general. The author considers the inherent difficulties of generating any scientific findings in this area, and concludes by discussing the signs of a hopeful trend to celebrate, rather than pathologize, people with exceptional gifts. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Temporal discounting of rewards in patients with bipolar disorder and schizophrenia.

Patients with bipolar disorder (BD) and schizophrenia (SZ) often show decision-making deficits in everyday circumstances. A failure to appropriately weigh immediate versus future consequences of choices may contribute to these deficits. We used the delay discounting task in individuals with BD or SZ to investigate their temporal decision making. Twenty-two individuals with BD, 21 individuals with SZ, and 30 healthy individuals completed the delay discounting task along with neuropsychological measures of working memory and cognitive function. Both BD and SZ groups discounted delayed rewards more steeply than did the healthy group even after controlling for current substance use, age, gender, and employment. Hierarchical multiple regression analyses showed that discounting rate was associated with both diagnostic group and working memory or intelligence scores. In each group, working memory or intelligence scores negatively correlated with discounting rate. The results suggest that (a) both BD and SZ groups value smaller, immediate rewards more than larger, delayed rewards compared with the healthy group and (b) working memory or intelligence is related to temporal decision making in individuals with BD or SZ as well as in healthy individuals. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Are working memory deficits in bipolar disorder markers for psychosis?

Working memory deficits have been identified in bipolar disorder, but there is evidence suggesting that these deficits may be markers for psychosis rather than affective disorder. The current study examined this issue by comparing two groups of individuals with bipolar disorder, one with psychotic features and one without psychotic features, with a group of normal controls. Working memory was conceptualized as a multicomponent system that includes auditory and visuospatial short-term stores, executive control processes, and an episodic buffer that allows for communication between short- and long-term memory stores (Baddeley & Logie, 1999). Results indicated that only executive control processes significantly differentiated the psychotic and nonpsychotic bipolar groups, although visuospatial working memory differentiated both bipolar groups from controls. The results support the idea that some aspects of working memory performance are markers for psychosis, while others may be more general markers for bipolar disorders. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

集成双极晶体管基区表面电流的准二维模型及其参数的提取

考虑到少子准费米能级沿基区表面的非均匀分布,建立了集成双极晶体管基区表面电流的准二维模型。利用栅控晶体管作为测试结构,提取出了主要的基区表面参数。     

双铝电凝聚气浮强化一级处理城镇生活污水

研究双铝电极电凝聚气浮强化一级处理城市污水的有效性和可行性．进行电解时间、电流密度、电解质等影响因素的静态试验，并通过动态试验，分析水力停留时间、电流密度、电流波形的影响，研究有机污染物去除特性．试验结果表明：COD、SS及色度去除率分别在75．11％、80％和80％以上，其COD、色度可达城镇二级污水处理厂二级标准，对处理小规模、分散性的城镇生活污水具有一定的推广价值．     

Growth of InGaN HBTs by MOCVD

The design and growth of GaN/InGaN heterojunction bipolar transistors (HBTs) by metalorganic chemical vapor deposition (MOCVD) are studied. Atomic-force microscopy (AFM) images of p⁺InGaN base layers (∼100 nm) deposited under various growth conditions indicate that the optimal growth temperature is limited to the range between 810 and 830°C due to a trade-off between surface roughness and indium incorporation. At these temperatures, the growth pressure must be kept above 300 Torr in order to keep surface pit density under control. An InGaN graded-composition emitter is adopted in order to reduce the number of V-shaped defects, which appear at the interface between GaN emitter and InGaN base and render an abrupt emitter-base heterojunction nearly impossible. However, the device performance is severely limited by the high p-type base contact resistance due to surface etching damage, which resulted from the emitter mesa etch.     

UHV/CVD生长本征硅外延层的研究

在微波双极型晶体管中,收集区的厚度是影响其截止频率的一个重要因素。普通的常压外延难以生长出杂质浓度变化陡峭的薄外延层。文章利用自行研制的超高真空化学气相淀积(UHV/CVD)系统SGE500,在N型(掺As)重掺杂衬底上进行了薄本征硅外延层生长规律的研究;并采用扩展电阻(SPR)、原子力显微镜(AFM)、双晶衍射(DCXRD)等方法,对外延层的质量进行了评价。采用该外延材料制作的锗硅异质结双极型晶体管(SiGe HBT)器件击穿特性良好。     

射频功率HBT自加热效应及补偿方法

从器件I-V特性的角度,表征了射频功率异质结双极晶体管(HBT)的自加热效应。研究了器件热阻、工作电压、电流增益、发射结价带不连续性(ΔEV)等诸多因素对器件I-V特性的影响。进而研究了为补偿自加热效应所加镇流电阻对热稳定性的改善情况,给出了器件热稳定所需最小镇流电阻(REmin)与这些因素的关系。结果表明,HBT的REmin要小于同质结双极晶体管(BJT)的REmin,因此,射频功率HBT将有更大的输出功率、功率增益和功率附加效率(PAE)。     

质子交换膜燃料电池流道设计

质子交换膜燃料电池(PEMFC)以其高效率、高比能量、低污染等优点被认为是一种适合人类发展和环境要求的理想电源.双极板(流场板)是质子交换膜燃料电池的重要部件,其质量占电池堆60%以上.流场板上的流道设计对电池性能、运行效率和制造成本有很大影响.系统地综述了现有的流道设计,剖析了流道的功能及其对电池性能的影响,并在此基础上讨论了流道设计的发展趋势.