基于互信息的四螺旋模型创新协同度研究

本文分析了&ldquo;政-产-研&rdquo;三螺旋模型的局限性和第四螺旋现有研究的不足之处，提出了以科技服务机构为第四螺旋构建&ldquo;政-产-研-服&rdquo;四螺旋模型的观点。随后，本文基于互信息和三螺旋算法设计了四螺旋创新协同度计量指标Tgias，并采用各主体科技论文产出数据作为其创新产出表征，利用Tgias指标量化测度了四螺旋各主体间的创新协同程度。量化分析结果表明，科技服务机构加入螺旋结构后全方位提升了政-产、政-研、产-研、政-产-研既有的协同度，反映出科技服务机构作为第四螺旋对原有三螺旋体系创新发展的催化和促进作用。对四螺旋模型的研究和应用有利于提高科技情报、技术转移等方面工作的协同创新效率。</p

Measurement of the Static Optoelectronic Characteristics of InGaAs/InP Avalanche Photodiode

建立了雪崩二极管的静态光电特性的自动测试系统。利用该系统对光敏面的直径为500μm的台面型InGaAs/InP雪崩光电二极管(APDs)进行测试。测试结果表明,该APD器件在90%击穿电压下的暗电流为151nA,在直径500μm的光敏面上其光响应均匀性良好。提出一种测量雪崩二极管倍增因子的方法,只需利用普通的测量电流-电压的测试仪器,就可以获得开始倍增时的光电流,从而得到APD的倍增因子。通过该方法得到的InGaAs/InPAPD器件最大倍增因子的典型值在10～100量级。A measurement system is set up which could measure static optoelectronic characteristics of avalanche photodiodes (APDs). By using this system, the mesa-structure InP/InGaAs APDs is measured. The results show that the APDs have a relatively low dark current (～150 nA at 90% of breakdown) and a uniform photoresponse profile of about 500 μm diameter. A method of getting APDs's multiplication gain is also proposed. Through getting the photocurrent at the point where multiplication is beginning, the multiplication gain can be obtained by the simple current-voltage equipment. For InP/InGaAs APDs, the typical maximum multiplication gain measured by this method is about 10～100

Research on Emotional Conflict in Generalized Anxiety Disorder

目的 考察广泛焦虑障碍患者的情绪冲突效应及时间因素的影响。 方法 以17名广泛性焦虑障碍患者为被试,采用情绪启动范式,以积极词、一般消极词和焦虑相关词为启动刺激,积极和消极人脸为目标刺激,变换 3种不同的 SOA ( 100ms、0ms、 - 100ms) ,考察了不包含焦虑相关词的“一般情绪冲突效应”(即情绪一致性效应),以及包含焦虑相关词的“特殊情绪冲突效应”。 结果 在目标刺激为积极人脸的情况下, SOA为 100ms和 -100ms时,均发现了显著的“一般”和“特殊”情绪冲突效应;在目标刺激为消极人脸的情况下,“一般情绪冲突效应”在 3种 SOA条件下均没有出现,但“特殊情绪冲突效应”均出现了。结论 广泛焦虑障碍患者的情绪冲突效应与时间因素密切相关;在他们身上发现的“特殊情绪冲突效应”模式,可能反映了广泛焦虑障碍患者对焦虑相关刺激的敏感性和注意偏向

Testing System of Phosphor Excited by Blue LED Based on Integral Sphere

为尽可能反映荧光粉在实际工作条件下的发光性质,准确测量荧光粉的发光性能,提出了一种基于积分球的荧光粉发光性能测试系统。该系统采用蓝光lEd作为激发光源,配置有TEC控温系统对光源有效实施控温,可提供持续稳定的激发荧光粉发光。采用出光筒控制光源方向和积分球收集光线,能有效防止能量损失,提高测试的精确性。通过实验得到了不同强度蓝光激发下的荧光粉光谱功率分布以及发光效能、量子效率、光转换效率等参数的变化规律。随着驱动电流的增大,由于蓝光芯片内量子限制斯塔克效应,从而导致蓝光峰值波长出现小幅度的蓝移。三种效率在小电流下基本呈线性下降趋势,且在大电流下趋于平缓。实验结果表明,该系统及方法可以有效地评价实际lEd芯片工作状态下的荧光粉发光性能。A testing system for phosphor luminous characteristics based on integral sphere is proposed so as to show luminous characteristics of phosphor at actual operation circumstances and measure its luminous characteristics accurately.Blue LED is used as an excited source in the system.TEC temperature control system is used to control the temperature of the source effectively.And continuous and stable excited light is provided to excite phosphor illumining.Energy loss is prevented effectively and testing accuracy is enhanced for the direction of source controlled by a light tube and light ray collected by integral sphere.Based on experiments,spectrum power distributions of phosphor excited by blue light with difference light strength and variation rules of parameters such as luminous efficiency,quantum efficiency and light conversion efficiency are got.With the increasing of driving current,a small blue shift appears in blue light peak wavelength for quantum confined Stark effect in blue light chip.Three kinds of efficiency almost show linear decline trend at low current and then approach to constant at high current.Experimental results show that luminous characteristics of phosphor on real LED chip at operation state can be evaluated effectively by the system and method.国家自然科学基金项目(11104230); 福建省重点科技项目(2011H6025;2012H0039