中小学生智力与反应时相关性研究

研究以小学四年级（10岁）,初中二年级（13岁）,高中二年级（16岁）的学生为被试,测试了个体智商、简单反应时、感知活动中复杂反应时、短时记忆活动中复杂反应时．并考察了它们的相关性。研究结果表明：（1）从总体上看,各个加工任务过程中的反应时与智商密切相关。（2）不同任务过程中反应时与智商的关系有各自特点。首先简单反应时与智商的相关系数较复杂反应时与智商的相关系数小;其次,感知过程中的复杂反应时与智商的相关系数较短时记忆过程中复杂反应时与智商的相关系数小。（3）中小学生的反应时与智商的相关性具有一定的年龄特征,随年龄的增长,反应时与与智商的相关程度逐渐减小,变化情况呈先快后慢趋势。     

基于PowerPC处理器硬核的1553B总线远置终端的实现

MIL-STD-1553B总线是目前在航空、航天、军事等领域的电子联网系统中广泛应用的一种标准总线。本课题采用新型的嵌入PowerPC405处理器硬核的FPGA片上可编程系统（SOPC）和美国DDC公司1553B协议芯片65170构建1553B总线的远置终端（RT）系统。文中介绍了PowerPC405处理器硬核和Virtex-II Pro系列FPGA芯片的基本特点,系统的软硬件实现方法和设计验证结果。     

Using relief texture for interactive and tangible virtual environments

This paper first introduces a way to improve interactivity with high polygon count virtual objects through the ＂mixed＂ use of image-based representation within one object. That is, both 3D polygonal and image-based representations are maintained for an object, and switched for rendering depending on the functional requirement of the object. Furthermore, in order to reduce the popping effect and provide smooth and gradual transition during the object representation switch, the object is subdivided with the subdivided parts possibly represented differently, i.e., using 3D models or images. As for the image-based representation, the relief texture （RT） method is used. In particular, through the use of the mixed representation, a new way called TangibleScreen is proposed to provide object tangibility by associating the image-based representation with a physical prop （projecting the RTs） in a selective and flexible way. Overall, the proposed method provides a way to maintain an interactive frame rate with selective perceptual details in a large-scale virtual environment, while allowing the user to interact with virtual objects in a tangible way.     

基于MPLS的VPN技术分析及应用

介绍了MPLS工作原理,从MPLS VPN的网络结构、体系架构来分析MPLS VPN的工作原理.通过MPLS VPN的基本配置实例来说明如何应用它,从而实现MPLS VPN的强大功能.     

县级电大为"三农"服务的必要性和可行性

在我国,“三农“问题已经严重影响到国民经济的整体发展和社会的全面进步.电大作为面向地方、面向基层、面向农村、面向边远和民族地区开展远程教育的开放型大学,在推进农村经济结构的战略性调整,实现农业增长方式转变,提高农民素质等方面大有可为.     

概念整合理论和关联理论的比较研究

作为目前两大主要的认知语用推理理论,概念整合理论和关联理论具有很多相同之处。作者旨在通过分析概念整合理论和关联理论共同的理论前提和相似的在线推理观,对比这两种理论的不同与相同之处,指出这两种方法在解释语言方面实际上是互为补充的,而并不是两个完全不同的、相互竞争的理论。     

MLSI-RT: memorize LOS range measurements identified residual test location algorithm and performance analysis

The dominant error source of mobile terminal location in wireless sensor networks (WSNs) is the non-line-of-sight (NLOS) propagation error. Among the algorithms proposed to mitigate the influence of NLOS propagation error, residual test (RT) is an efficient one, however with high computational complexity (CC). An improved algorithm that memorizes the light of sight (LOS) range measurements (RMs) identified memorize LOS range measurements identified residual test (MLSI-RT) is presented in this paper to addre...     

高压缓冲器的焊接

辽河石油勘探局油建二公司是全国石油基建系统具有A1A2级压力容器生产资质的极少数企业之一.2005年10月,首次为某石化厂成功地焊接制造了一批高压缓冲器.在制造过程中,对容器的焊接特性进行了理论分析,制定了GTAW+SHAW和多层多道焊的工艺方法,采取预热+PWHT的措施.有效地控制了焊接缺陷,保证了焊接质量.截止到目前为止已经成功焊接上百台高压缓冲器,取得了很好的效果.     

Motor Pool Excitability to a Reaction Time Stimulus Preceded by a Varied Foreperiod

Abstract

Motor pool excitability, H-reflex amplitude, was studied in RT responses preceded by varied foreperiods. Rapid plantar flexion of the foot followed auditory warning signals, varied foreperiods, and visual RT stimuli. Response speed was latency of EMG onset in the soleus muscle (PMT). The H-reflex stimulus was either omitted (none), or presented at one of three intervals in the movement response period: 0 (simultaneous with RT stimulus), 100 or 200 ms following stimulus. Control H-reflexes were taken before and after RT trials. The motor pool was not differentially excited following the random foreperiods. In fact it was not elevated over control values until late into the preparatory period (200 ms) which probably reflects the direct expression of the motor command. Using the H-reflex paradigm in combination with a RT response strongly altered the PMT when the H-reflex was presented early in the preparatory period (0). Since motor pool excitability changes were not evident early in the movement preparation period, they poorly predicted PMTs.     

低氧运动对骨骼肌胰岛素受体亲和力的影响

目的:观察低氧运动对骨骼肌胰岛素受体亲和力的影响.方法:各组大鼠经过跑台运动和低氧暴露后,用受体放射性配基结合分析法(RBA)测定大鼠骨骼肌胰岛素受体亲和力.结果:1 d急性低氧运动后,常氧运动组和高住低训组骨骼肌胰岛素受体高亲和力常数(KD1)显著性增加(P＜0.05),高亲和力受体结合容量(RT1)、低亲和力常数(KD2)和受体结合容量(RT2),在各组之间无显著性差异(P＞0.05).28 d低氧运动后,各组之间高亲和力受体常数(KD1)、受体结合容量(RT1)无显著性差异(P＞0.05),但低氧暴露组、常氧运动组及高住低训组的低亲和力受体常数(KD2)和受体结合容量(RT2)均有非常显著性增加(P＜0.01).结论:低氧和/或运动对胰岛素低亲和力受体的影响更为显著,使胰岛素受体亲和力下降,但同时使胰岛素受体密度显著增加,从而增强胰岛素对低氧和/或运动的反应能力.