在轻水堆上用模拟机落棒法测量反应性时一种消除空间效应的方法

推出一种以实验为基础，引入理论计算空间通量畸变因子Ｋ的修正公式来消除模拟机落棒法测量反应性空间效应的方法。用两个实例验证了该方法的效果；与脉冲中子源法结果作了比较，符合很好。该修正公式用微机输入参数作在线运算，将使落棒法在保持原有优点的前提下获得满足工程需要的精度。还列举两种典型的Ｋ因子平面分布图来说明其分布的规律，指出寻找到Ｋ在０８至１２之间区域内放置探测器，可得到一次落棒小于±３％的实测精度，而不需作任何修正。     

The human startle reflex and alcohol cue reactivity: Effects of early versus late abstinence.

This study investigated the human eyeblink startle reflex as a measure of alcohol cue reactivity. Alcohol-dependent participants early (n?=?36) and late (n?=?34) in abstinence received presentations of alcohol and water cues. Consistent with previous research, greater salivation and higher ratings of urge to drink occurred in response to the alcohol cues. Differential salivary and urge responding to alcohol versus water cues did not vary as a function of abstinence duration. Of special interest was the finding that startle response magnitudes were relatively elevated to alcohol cues, but only in individuals early in abstinence. Affective ratings of alcohol cues suggested that alcohol cues were perceived as aversive. Methodological and theoretical implications of the findings are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

铀氢锆脉冲堆及其在科学技术上的应用

简述了我国铀氢锆脉冲堆的结构和特点及其在科学技术上的应用前景。     

Formation and relative reactivity of comonomer H-complexes in the radical copolymerization of acrylic acid with 1-vinyl-2-pyrrolidone

The dimerization constant (K_g) of acrylic acid and the association constant of the comonomer complex between acrylic acid and 1-vinyl-2-pyrrolidone (K₁) have been determined in chloroform by means of IR and ¹H NMR spectroscopy: K_d=(2.0±0.2) × 10³litre mol^?1 and K₁=68.5±0.5 litre mol^?1. A detailed equation for the copolymer composition considering the participation of the intermolecular complexes in the chain propagation has been derived with the help of a specific regular three addition states Markov chain. Applying a numerical procedure for fitting the experimental curve for the comonomer composition, this equation has been used in the estimation of the dimer and the comonomer complex relative reactivities. The considerably higher reactivities of the two complexes compared with that of the monomers are accounted for by the π-electrons' greater delocalization in the transition states involving the complexes species.     

H-complex formation and influence on the radical copolymerization of acrylic acid and 1-vinyl-2-pyrrolidone in tetrahydrofuran

The association constant of the H-complex formation between acrylic acid and 1-vinyl-2-pyrrolidone in tetrahydrofuran at 22°C (K₁ = 1350 mol 1^?1) was determined by means of ¹H NMR spectroscopy. A detailed equation for the copolymer composition, accounting for the participation in the chain propagation of the above complex and that between acid and solvent molecules, was derived. It was used for evalution of the relative reactivities of the complexes discussed and of the uncomplexed 1-vinyl-2-pyrrolidone molecules.     

基于SEED微计算机的实时数据获取与处理系统的软件

本文叙述了基于SEED-80微型计算机的实时数据获取与处理统软件的设计及其功能。该软件系统灵活、方便。其主要功能监视与控制各实时数据获取通道,管理计算机各外围设备并按用户的要求进行数据处理。在程序设计上,由于采用了类似于模块程序方法和复盖技术,因而对计算机内存进行了有效的分配与管理并实现了前后台操作。     

Effects of Ultrasonic Vibration on the Electroinitiated Copolymerisation of Styrene and Isoprene

Copolymerisation of styrene and isoprene by constant potential electrolysis in dichloromethane was achieved at different polymerisation potentials. Effect of ultrasonic vibration on the rate and the yield of polymerisation has been discussed. The composition of the copolymers was found to be affected by the vibration as well as the polymerisation potential (E_pol). At E_pol=+3.30 V we found that r₁=r₂ and mole percents of isoprene and styrene in copolymer were equal to each other. Equality was also observed on reacted monomer concentrations, at that potential, which can be called critical polymerisation potential. At E_pol values above or below the critical polymerisation potential none of the above-mentioned properties were equal. Monomer reactivity ratios were determined by the integrated Lewis-Mayo equation. Ultrasonic vibration as well as polymerisation potential was found to affect reactivity ratios.     

Psychophysiological reactions to films by chronic schizophrenics: II. Individual differences in resting levels and reactivity.

Resting skin-resistance, heart-rate, and reactivity data to 1 of 2 tension-arousing films were obtained from 2 normal comparison groups and a sample of drug-free chronic schizophrenics. The schizophrenics were subdivided into 3 subsamples on the basis of the number of deviant associations given to a word-association test. The resting skin-resistance data failed to discriminate between normals and schizophrenics; however, meaningful differences were found among the schizophrenic subsamples such that increasing thought disturbance was associated with increasing basal resistance levels. Basal heart-rate data did indicate faster heart rate for all schizophrenic subsamples compared with both normal groups. Reactivity data also indicated different results for the 2 indexes. Skin-resistance indexes failed to indicate any differences between schizophrenics and normals or among the schizophrenic samples. 1 heart-rate index suggested less reactivity for schizophrenics than for normals. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Recent Advances with Glycidylamine Resins

A new procedure for the glycidylation of aromatic amines has been developed recently, which leads to resins of lower viscosity, longer shelf-life and higher purity than methods used previously. Resins made by the new process show considerable processing and applications advantages over those made by earlier methods. The new process has also made accessible high purity glycidyl derivatives of amines which have hitherto proved difficult to glycidylate effectively.     

Activité Cardiaque et Comportement: Mesures des Premiers Processus D'Interaction Entre L'Organisme Naissant et Son Environnement.

Two hypotheses are examined in order to explain the interactive mechanisms between the neonate and its environment: at birth, the organism is passive and its response to the outer world is defensive, or, in the contrary, it possesses active interactive and learning capacities. Recent work on the neonate's spontaneous cyclic activities and his motor and physiological reactivity gave evidence of his discriminative and adaptative capacities. Analysing the interrelations between many variables, it was possible to demonstrate a neonatal cardiac orienting response. The meaning of the stimulus and its signal value (attention or action) would determine the nature of the behavioral and cardiac responses of the organism. The meaning of the measured responses and the nature of the interaction between the organism and the environment could be precised by the correlated analysis of motor and physiological systems. By such a method it was possible to demonstrate that, at first, development starts as an active interactive and learning process in a specific environment. (PsycINFO Database Record (c) 2010 APA, all rights reserved)