低温日用光泽透明釉的研制

研制了一种以硅灰石、锂辉石为主要助熔剂，烧结温度在1150℃的低温日用光泽透明釉，性能达到了国家标准。文章通过对其烧成过程和显微结构观测，探讨了其烧成机理，以及助熔剂在成釉过程中的作用。     

Single neurons in the medial prefrontal cortex of the rat exhibit tonic and phasic coding during trace fear conditioning.

Trace fear conditioning is a learning task that requires the association of an auditory conditioned stimulus (CS) and a shock unconditioned stimulus (US) that are separated by a 20-s trace interval. Single neuron activity was recorded from the prelimbic and infralimbic areas of the medial prefrontal cortex in rats during trace fear conditioning or nonassociative unpaired training. Prelimbic neurons showed learning-related increases in activity to the CS and US, whereas infralimbic neurons showed learning-related decreases in activity to these stimuli. A subset of prelimbic neurons exhibited sustained increases in activity during the trace interval. These sustained prelimbic responses may provide a bridging code that allows for overlapping representations of CS and US information within the trace fear conditioning circuit. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

CPM中相关同步技术的研究

针对连续相位调制系统,提出了一种利用相关器来辅助实现同步的方法,分为差分相关、绝对相位相关两种方法.通过MATLAB仿真,分析了两种相关方法的性能.在性能最佳的基础上,提出了一种利用FPGA实现的简化算法,节省了FPGA芯片的逻辑资源,使相关器的FPGA有效实现变为可能.     

Controlling free flight of a robotic fly using an onboard vision sensor inspired by insect ocelli

Scaling a flying robot down to the size of a fly or bee requires advances in manufacturing, sensing and control, and will provide insights into mechanisms used by their biological counterparts. Controlled flight at this scale has previously required external cameras to provide the feedback to regulate the continuous corrective manoeuvres necessary to keep the unstable robot from tumbling. One stabilization mechanism used by flying insects may be to sense the horizon or Sun using the ocelli, a set of three light sensors distinct from the compound eyes. Here, we present an ocelli-inspired visual sensor and use it to stabilize a fly-sized robot. We propose a feedback controller that applies torque in proportion to the angular velocity of the source of light estimated by the ocelli. We demonstrate theoretically and empirically that this is sufficient to stabilize the robot''s upright orientation. This constitutes the first known use of onboard sensors at this scale. Dipteran flies use halteres to provide gyroscopic velocity feedback, but it is unknown how other insects such as honeybees stabilize flight without these sensory organs. Our results, using a vehicle of similar size and dynamics to the honeybee, suggest how the ocelli could serve this role.     

基于C8051F的电量测量与传输系统

介绍一种利用高速51系列单片机C8051F020组成的电量测量及数据传输系统,系统能比较实时准确地监测三相电压、电流、功率、电能和功率因数等。详细介绍了频率、相位差的测量原理和A/D转换,以及系统所需电源的电路设计。并且讨论了几种数据传输的方式:RS 485通信、CAN通信及GPRS通信。此系统可以用于电力系统中家庭用户以及变压器的远程电量监测。     

Tonic and phasic processes in the acute effects of alcohol.

This article presents a novel method for measuring the acute effects of alcohol. One hundred twenty nonproblem drinkers aged 21-28 participated in 3 alcohol administration sessions that produced peak blood alcohol concentrations (BACs) near .09 g%. Subjective intoxication ratings were taken at multiple points across rising and falling BACs. Mathematical modeling techniques decomposed intoxication ratings into a tonic component sensitive to BAC level and a phasic component sensitive to BAC rate of change. This model provided a good fit to observed data. Tonic and phasic gain parameters showed high repeatability across sessions. The average phasic gain parameter was about 4 times larger than the average tonic gain parameter, indicating that subjective intoxication is usually more affected by BAC change than by BAC level. The associations of drinking practices with tonic and phasic gain parameters varied by gender and family history of alcoholism. Tonic-phasic modeling allows individual and group differences in the acute effects of alcohol to be studied as time-dynamic processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

相位编组方法提取直线

相位编组方法的提出,是针对大多数直线抽取方法的两个主要弱点：１）利用灰度变化的幅度,作为局部边缘重要性的主要度量,受噪声影响较大;２）对边缘特征作局部决策前,缺乏对图像结构的全局理解。该方法有效地解决了以往方法中关于边缘检测算子尺寸方面的难题,可以从复杂的图像中抽取出低对比度的直线,并能获得不同类型的边缘图。     

Pupillometric assessment of compensatory effort in a memory search task under physical and pharmacologically-induced suboptimal states

Extensive research has shown that the phasic pupil size (peak level on each trial) is a sensitive measure of the degree of mental effort demanded by a task. In the present study, the validity of the pupil response as an index of mental effort in suboptimal conditions was investigated. Thirteen males (19-29 years) performed a memory and display-search task in a practice session, followed in random order by an oxazepam session, a placebo session, a physical exercise session, and a control session. After both oxazepam and physical exercise, decision times increased, but pupil response increased only after physical exercise. This result was explained by the possibility that under physical fatigue, compensatory effort was exerted, whereas under drug-induced fatigue, subjects seemed unable to compensate for the performance decrement. The pupil response appears to be a valuable tool for gaining more insight into different effects of suboptimal states.     

Autonomic correlates of chronic schizophrenia: A reaction time paradigm.

Assessed basal, tonic, and 2 phasic measures of heart rate and skin conductance among 16 drug-free, chronic, process, nonparanoid schizophrenics, and 2 groups of control Ss (hospital staff and prison inmates). Of particular interest were changes in autonomic activity that attended manipulation of "go" signal intensity within a reaction time paradigm. Among control Ss, increased signal intensity produced increases in tonic levels and amplitude of anticipatory responding. Among schizophrenics, however, the reverse occurred: Increased signal intensity resulted in decreased tonic levels and inhibition of anticipatory responding. Schizophrenic responses occurred in the absence of basal level differences between groups. Results are interpreted as indicating the presence of a learned anticipatory set that serves to reduce the impact of stimulus intensity. This inhibitory set would also appear to reduce receptivity to the cue component of stimuli. (16 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Alerting and orienting in Alzheimer's disease.

Recently, researchers (E. Festa-Martino, B. R. Ott, & W. C. Heindel, 2004, see record 2004-12990-007; A. Tales, J. L. Muir, A. Bayer, R. Jones, & R. J. Snowden, 2002; A. Tales, J. L. Muir, A. Bayer, & R. J. Snowden, 2002; see record 2002-06031-015) have found significantly abnormal spatial orienting together with the abolishment of the alerting effect in Alzheimer's disease (AD). However, these research groups differed in their interpretation of the results. A. Tales, J. L. Muir, A. Bayer, R. Jones, and R. J. Snowden (2002) and A. Tales, J. L. Muir, A. Bayer, and R. J. Snowden (2002) explained their data in terms of two independent processes, whereas E. Festa-Martino et al. (2004) interpreted their findings as indicative of an inverse association, namely that the increased spatial orienting effect in AD was the direct result of the abolition of the phasic alerting effect. In this further study examining exogenous spatial orienting and phasic alerting, the authors present evidence to suggest that the increased spatial orienting effect in AD is not the result of a decreased phasic alerting effect. (PsycINFO Database Record (c) 2010 APA, all rights reserved)