纤维素吸附材料的研究进展

文章结合近些年国内外研究,概述了纤维素吸附材料的制备、吸附机理以及应用研究进展,总结存在的问题并展望其美好前景。     

Attentional Patterns Involved in Coping Strategies in a Sport Context

We investigated the relationship between coping strategies and attentional bias after a sport competition. We administered the Ways of Coping Checklist (Paulhan, Nuissier, Quintard, Cousson, & Bourgeois, 1994) to 145 athletes immediately after they had participated in a sport competition. We also assessed attentional bias using a dot probe detection task. Results revealed that emotion-focused coping strategies led athletes to orient their attention away from threat, whereas athletes who adopted problem-focused coping strategies focused their attention toward threat. More precisely, problem-focused coping strategies are related to a facilitated detection of threat, not to disengagement difficulties. The vigilance attentional bias seems to be a compensatory strategy to cope with a stressful situation, such as sport competition.     

武夷山大气降雨中阴离子的分析

采用离子色谱法探索了离子色谱法测定降水中F-、Cl-、NO3-、SO42-的方法,本方法灵敏度高,线性好,结果精密度与准确度良好,能满足雨水分析要求。     

超强度激光与等离子体相互作用的数值研究

用超粒子模拟方法（Particle in Cell Method）数值研究了超强激光（10^20W/cm^2）与等离子体相互作用后产生的粒子束收缩问题.结果表明,由于超强激光照射的等离子体靶形的改变,直接影响被加速的粒子束收缩.阐述了激光辐照三角形壳靶时,等离子体向心会聚过程的数值模拟实验结果.     

University non-admittance and anomie: Reconsidering the promise of an egalitarian society

Abstract

The core theme of this article is the emerging tension between the egalitarian discourse that increases the general aspiration of people to become more educated and actual admission constraints. A desire to attend a university and not being allowed to (i.e. non-admittance) is a loss that can potentially result in an anomic condition. Anomie theory gives a sociological explanation for a painful situation in which there is a cultural overemphasis on success combined with structurally limited opportunities. In this study, the focus is on the experiences of prospective students who have been applying to a selective university in Finland without gaining admission. The data consists of 50 personal online narratives. The analysis is presented in accordance with a conceptual typology of individual responses to the conditions of non-admittance. The findings yield important insights regarding university choice, meritocratic selection and formulation of equitable admission policies.     

平行强外磁场中的氢分子离子的能量计算

采用单中心展开方法和Bohn-Oppenheimer近似,用B-splines技术研究平行强外场下的氢分子离子的基态和低激发态能量的收敛性.在计算中,将径向波函数和角向波函数用B-splines基函数展开.外加磁场强度为2.35×103→2.35×106T,计算能量可以收敛到±10-6~±10-8eV.与其他计算结果比较表明,B-splines技术很适合用来研究强外磁场下的分子能量的计算,在强外磁场B=2.35×106T的情况下,仍可以获得±10-6eV精度.     

Synthesis of 3-O-Benzoyl-1 ,2-O-isopropylidene-a-D-allofuranose and Its Dimesylated Derivative

Diisopropylidenated a-D-glucofuranose (1) was oxidated with CrO;-Pyridine complex. Oxidated product and its hydrate were separated and were reduced together to synthesize diisopro-pylidenated a-D-allofuranose (3 ). The yield of 3 increased by 8% than that with only oxidated prod-uct as reduction substrate. Benzoylated derivative of 3 was selectively hydrolyzed and dimesylated to synthesize 3-O-benzoyl-l ,2-O-isopropylidene-a-D-allofuranose (5) and its dimesylated deriva-tive respectively. The overall yield of 5 from 1 was 36%. Each step and final products were analyzed by 'H-NMR spectra and other methods. The experiments showed that the influence of acetic acid concentration on selective hydrolysis was obvious. The hydrolysis yield was 81. 8%. Oxidation, re-duction and other procedures were practical and had application potential.     

基于广义预测算法的罐头杀菌温度控制系统研究

一般罐头杀菌温度控制都采用PID算法，PID算法存在控制精度不高，鲁棒性差等缺点.广义预测控制（GPC）是应用“多步预测、滚动优化、反馈校正”的思想，其算法鲁棒性好，控制效果佳。本文研究采用广义预测控制方法对软罐头杀菌锅的温度控制，并通过计算机仿真说明其控制算法的有效性。     

植物体β-胡萝卜素传感电极的研制及应用

利用从胡萝卜中提取的 β -胡萝卜素研制出的PVC(聚氯乙烯 )膜 β -胡萝卜素传感电极 ,测验其特性及Nernest响应范围 .检测限为 5 .0× 10 -7mol/L ,可直接用于植物胡萝卜中的 β -胡萝卜素的测定 ,选择性好 ,干扰少 ,方法简便快速 .     

碳酸盐热稳定性的定量探讨

探讨了碳酸盐热稳定性与离子极化作用之间的定量关系，并应用中心原子稳定势预测其分解温度。