试论介词“於”字在《史记》名词性补语中的分布规律

介词“於”字在名词性补语中的分布问题 (也就是说什么时候该用“於”字,什么时候不该用“於”字),是一个众说纷纭、争论已久的重要的语法问题。王力在指导研究生时说:“我们可以做一篇文章专谈《史记》中这种所谓省略‘於’,字的情况:在什么情况下用‘於’字,在什么情况下不用‘於’字。”这种建议,以点带面,显然有助于说明“於”字在古汉语名词性补语中的分布问题。根据个人的考察,“於”字在《史记》名词性补语中的分布是有规律的:“於”字的有无,严格地说不是由句式决定的,而是由补语所表示的不同意义决定的。换言之,在《史记》名词性补语中,就句式看,“於”字有无是任意的;而就补语意义看,“於”字有无不是任意的。     

Predictive performance of ‘Diprifusor＇ TCI system in patients during upper abdominal surgery under propofol／fentanyl anesthesia

Objective: To evaluate the predictive performance of ‘Diprifusor‘ TCI (target-controlled infusion) system for its better application in clinical anesthesia. Methods: The predictive performance of a ‘Diprifusor‘ TCI system was investigated in 27 Chinese patients (16 males and 11 females) during upper abdominal surgery under total intravenous anesthesia (TIVA) with propofol/fentanyl. Measured arterial propofol concentrations were compared with the values predicted by the TCI infusion system.Performance was determined by the median performance error (MDPE), the median absolute performance error (MDAPE), the divergence (the percentage change of the absolute PE with time), and the wobble (the median absolute deviation of each PE from the MDPE). Results: The median (range) values of 14.9% (-21.6%～42.9%) for MDPE, 23.3% (6.9%～62.5%) for MDAPE, -1.9% h^-1(-32.7%～23.0% h^-1) for divergence, and 18.9% (4.2%～59.6%) for wobble were obtained from 227 samples from all patients.For the studied population, the PE did not increase with time but with increasing target propofol concentration, particularly following induction. Conclusions: The control of depth of anaesthesia was good in all patients undergoing upper abdominal surgical operation and the predictive performance of the ‘Diprifusor‘ target controlled infusion system was considered acceptable for clinical purposes. But the relatively bigger wobble showed that the pharmacokinetic model is not so suitable and requires improvement.     

汽轮机冷凝器污垢自转塑料纽带连续清洗节能技术

本介绍了作对水垢-汽轮机冷凝器真空度影响状况的调查及其水垢引起的经济损失估计，叙述了自转塑料纽带的连续清洗和传热强化原理，试验表明自转塑料扭带的连续清洗能力能够满足冷凝器污垢清洗的要求，并且兼有幅度为9％-15％的传热强化作用，长时间的考核试验运行没有发现扭带对钢管壁的磨损问题，计算分析说明连续清洗纽带对提高机组真空度、出力和增产增效的作用显。     

职教部门在地质工作改革中如何进一步 发挥作用

我国正处在社会主义初级阶段。初级阶段的基本特征,一是社会主义制度已经建立,二是生产力落后,商品经济不发达。这个阶段所面临的主要矛盾,是人民日益增长的物质文化需要同落后的社会生产之间的矛盾。因此,这个阶段的中心任务是发展生产力。     

U.S. and Korean children's comprehension of fraction names: a reexamination of cross-national differences

Two experiments tested the claim that the transparency of Korean fraction names promotes fraction concepts (Miura, Okamoto, Vlahovic-Stetic, Kim, & Han, 1999). In Experiment 1, U.S. and Korean first and second graders made similar errors on a fraction-identification task, by treating fractions as whole numbers. Contrary to previous findings, Korean children performed at chance when a whole-number representation was included. Nonetheless, Korean children outperformed their U.S. peers overall. In Experiment 2, U.S. children's performance improved when fraction names were used that explicitly referred to part-whole relations like Korean fraction names. U.S. children's scores actually exceeded those of Korean children. Thus, although the differences in fraction names may influence children's performance, this may not account for the reported cross-national differences.     

挖掘潜力，训练能力，发展智力

挖掘教材中习题的潜在功能，通过纠正学生习题中的错误，加深对概念的理解；结合教材中习题的多种解法，灵活运用概念法则，提高学生的解题运算能力；解答教材习题时充分引导方法伸延，发展学生创新智力。     

Study on the comprehensive combustion kinetics of MSW

The combustion behavior of typical components of MSW was examined with a thermal gravimetric analyzer (TGA). The experiments were done over the temperature range of room temperature to 1000℃ at a heating rate of 10 oC/min and in an oxidizing atmosphere. The results indicated that the entire weight loss process of each typical component of MSW consists of one to three distinct combustion stages. The combustion of typical components of MSW could be modeled by one to three independent reactions. The corresponding parameters of typical components of MSW such as activation energy, pre-exponential factor, and reaction order were determined. The calculated results using the comprehensive kinetic model composed of one to three independent and consecutive reactions, agreed well with experimental results.     

面向21世纪的有机化学

提出了21世纪有机化学面临的机遇和挑战,揭示了当今有机化学的研究热点,阐述了21世纪有机化学的发展趋势及研究方向。