纵横家的外交策略及其现代意义——古代外交和谐论

纵横家是先秦时期著名的智慧群体,也是当时列国外交活动的主体。他们的有的放矢、善抓机遇、国无常友亦无常敌的思想认识以及外交活动须以国力为本的外交策略对于当前国际社会之间的交往具有重要的参考价值和启迪意义。     

Further evidence for the summation of latent inhibition and overshadowing in rats’ conditioned taste aversion

Repeated exposures to a target taste (X) attenuated subsequent development of rats’ conditioned aversion to X (latent inhibition effect). Presentation of another taste (A) after X in conditioning (serial X-A compound conditioning) also attenuated conditioned X aversion compared with conditioning without A (overshadowing). Furthermore, the latent inhibition and overshadowing effects summed to show the least conditioned aversion in the rats given both the target preexposures and the serial X-A compound conditioning treatment. These results question the validity of the comparator hypothesis as an explanation for Pavlovian conditioning of rats’ conditioned taste aversion.     

Asymmetrical retention functions for sequences of light flashes or tone bursts in the rat

In Experiment 1, rats were trained in a symbolic delayed matching-to-sample task to discriminate sample stimuli that consisted of sequences of magazine light flashes. The intertrial interval was illuminated by the houselight for Group Light, and it was dark for Group Dark. Retention functions exhibited a choose-many response bias when the delay interval was illuminated by the houselight in both groups, and no consistent response bias when the delay interval was dark. In Experiment 2, rats were trained to discriminate sample stimuli that consisted of sequences of tone bursts. During delay testing, a different tone (i.e., different frequency and location than the sample tone) was present or absent during the delay interval. The retention functions exhibited a significant choose-many bias when tone was present during the delay and a choose-few bias when tone was absent. Asymmetrical retention functions for tone burst and light flash sequences are due to the similarity between the stimulus conditions of the delay interval and the modality of the sequential event being discriminated. These results are consistent with an instructional ambiguity explanation of response biases in memory for number.     

Spontaneous recovery of consummatory behavior, but not of consummatory successive negative contrast

Five experiments were designed to study spontaneous recovery (SR) in two situations involving consummatory behavior: consummatory successive negative contrast (cSNC) and consummatory extinction (cE). SR of consummatory suppression should occur if incentive downshift induces an egocentric memory encoding information about the emotional reaction to the downshift that is counterconditioned or extinguished during exposure to the downshifted reward. SR of cSNC failed to occur after resting periods of 24, 96, or 336 h interpolated following complete (Experiment 1) and incomplete (Experiment 2) recuperation of consummatory behavior, and was not induced by the opioid-receptor antagonist naloxone (2 mg/kg), known to enhance cSNC (Experiment 3). However, SR of consummatory behavior occurred across sessions in cSNC (Experiment 3) and cE (Experiments 4-5). Furthermore, naloxone facilitated cE without affecting SR (Experiments 4-5). These results are discussed in relation to evidence for the development of an egocentric memory of the aversive downshift experience in consummatory situations.     

阿司匹林抵抗及对策

阿司匹林广泛应用于心血管事件的预防,减少了心血管事件的发生。阿司匹林通过不可逆地和脂肪酸环氧化酶结合,抑制血小板聚集的激动剂血栓素A2的合成,发挥抗血小板聚集作用。但也有一些患者服用阿司匹林过程中有的血小板聚集能力和临床缺血事件不能被抑制。阿司匹林抵抗通常是指阿司匹林治疗未能引起预期的生物学效应抑制血栓素的生物合成或未能预防血栓事件的现象。导致这种现象的确切原因较复杂,包括不适当应用药物的相互作用,剂量不足,环氧化酶-1基因的多态性,及非血小板依赖血栓形成途径等有关。临床医生应该了解这些导致阿司匹林抵抗的因素,规范阿司匹林的应用剂量,适当地联合应用其他药物治疗。     

医患间的人际冲突与管理策略

医患间人际冲突是影响医患关系的重要因素,它对医患关系不仅能够产生消极的结果,还能够产生建设性的结果。分析了医患间人际冲突的本质、来源、影响以及冲突管理策略,旨在促进人们通过理解冲突的本质和产生的原因,实行有效的冲突管理策略,使冲突得到建设性解决,促进良好的医患关系的建立。     

小学一年级儿童简算策略发现的意识性研究

考察不同问题呈现方式和不同问题情境对小学一年级儿童简算策略发现的影响,及策略发现有无意识性。结果表明,问题呈现方式与问题情景对相反数策略发现影响显著,完整呈现比不完整呈现,封闭问题情景比混合问题情景更容易促使儿童发现新策略。研究证实了无意识策略的存在。通常情况下是先出现无意识策略,再出现有意识策略。但并非所有有意识策略出现之前都出现无意识策略。     

Optimal Partitioning of Testing Time: Theoretical Properties and Practical Implications

This paper deals with optimal partitioning of limited testing time in order to achieve maximum total test score. Nonlinear optimization theory was used to analyze this problem. A general case using a generic item response model is first presented. A special case that applies a response time model proposed by Wang and Hanson (2005) is also presented. Theoretical properties of the optimal solution are derived. Their practical implications to optimal test-taking strategies are also discussed. The theoretical properties are in general agreement with the conventional advice to the examinees on pacing strategy.     

医学专科能力评审的争议及规避策略

医院的医学重点专科建设是医院发展的重要战略,如何认定某医院某专科为地方的重点专科,是一个系统工程。地方卫生行政主管部门如何把握评审认定标准,展示政府执政的公正公平,是十分敏感的问题,它蕴藏着很大的风险。在重点专科的评定过程中如何体现政府形象,规避行政风险,需要认真探讨。结合某市重点专科检查的实际情况进行分析,就此种争议及规避策略提出建议。     

中学生学习策略的结构与使用特点

本文采用修订的中学生学习策略量表,系统考察了初一到高三1341名中学生学习策略的使用情况。结果表明:①本次修订的中学生学习策略量表具有良好的信度和效度,划分为认知策略、元认知策略和资源管理策略的结构合理;②中学生在认知策略、元认知策略和资源管理策略的使用上有随年级增长而下降的趋势,在资源管理策略上女生得分明显高于男生;③时间管理策略、努力策略和支持寻求策略对初中生的学习成绩有正向预测作用,调节策略和努力策略对高中生的学习成绩有正向预测作用,而支持寻求策略有负向预测作用。