流约束通讯网络可靠度的一个新算法

提出了流约束通讯网络的一个快速有效算法，系统是可靠的当且仅当特殊指定的流能从源点传递到汇点，中算法与传统算法有所区别，将传统的两阶段算法转化为一阶段算法，算法Ⅰ以任何一个有效组为初始有效组，所有的有效组都可以从此初始有效组中生成，且由此生成的所有有效组彼此不交，算法Ⅱ是第一个算法的对偶算法，同时中给出一个反例表明[8]中算法会遗漏有效组。     

教育者的信心与教育效果的长期性--论影响力与教育期望两者的背景水平

每项教育活动都会对受教育者产生短期或长期影响。大多数教师都较重视教育行为的短期效果。但是人的发展 ,尤其是思想和心理水平的发展是一个长达一生的过程。教育效果的长短取决于教育期望水平和影响力背景水平的一致程度     

两种除草剂对加拿大一枝黄花的防除效果比较研究

鉴于对加拿大一枝黄花这一外来入侵物种危害性的了解,以及控制其扩展蔓延的困难。本文研究使它隆乳油2 g/L、Round-up 15mL/L、以及两者的混合液对开花期的加拿大一枝黄花的防除效果。结果表明:无论鲜重防效还是根系生理指标的测定,Round-up防除效果最好。药后20天,Round-up对地上部和根系鲜重防效分别达到49.18%和62.63%,而使它隆只有7.05%和30.18%。生理上,Round-up能明显抑制根系活力、过氧化物酶的活性、显著地降低可溶性糖的含量和提高丙二醛的含量。     

试从翻译效应学角度看中国文化的嬗变

本文从翻译效应学角度，通过对中国翻译史上几次大的翻译活动的考察，来论述翻译作为一种传播文化的手段。对译入语固有文化的影响或曰翻译效应，从而理清中国文化从远古走向现代的发展历程和嬗变脉络，并给当代中国文化的建设提供某种借鉴或启示。     

Minimal energy maneuvering control of a rigid spacecraft with momentum transfer

The main goal of this study is to investigate a minimal energy rest-to-rest maneuvering control problem with open final time of a rigid spacecraft actuated by three orthogonal momentum wheels. Different from conventional shooting methods, this control problem is formulated and solved as a constrained nonlinear programming (NLP) one by utilizing an iterative procedure. In this novel method, the count of control steps is fixed initially and the sampling period is treated as a variable in the optimization process. An approach to find the initial feasible solutions of the NLP problem is also proposed. Since initial feasible solutions can be found easily, the optimization process of the NLP problem can be started from different points to find the minimal energy rest-to-rest maneuver of the rigid spacecraft between two attitudes. To show the feasibility of the proposed method, simulation results are included for illustration.     

茴香醛抗真菌作用的实验研究

本文以琼脂稀释法测定了茴香醛对10种真菌的最低抑菌浓度.实验发现茴香醛对所试10种真菌均有抑和杀菌作用,对其中自色念珠菌、新型隐球菌及孢子丝菌等条件致病真菌也具有抗真菌活性.其临床意义有待于进一步探讨。     

切实搞好课堂内外结合确保中学英语教学质量

能否确保中学英语教学质量，关键是营造一个良好的学习氛围，科学设置情景教学，优化教学的各个环节，分层施教，以优带劣，最大限度地激活学生学习英语的动因，方能达到预期的效果。     

林农复合生态系统中的生态效应分析

本文对林农复合生态系统中的生态效应,如净生产力与经济产量,物质、能量转化,光能利用率,温、湿效应,时、空效应,土壤水分、理化性状的改变,刘病虫害的抑制效应以及刘间种作物产品的有效成分和质量的影响等等,进行了分析。结果表明,林农复合生态系统的生态效应是十分显著的,是一类行之有效的、值得推广的经营方式。     

A Study of Disciplinary, Structural, and Behavioral Effects on Course Outcomes in Online MBA Courses

This article reports the results of a 2‐year study examining the effects of subject matter, course structure, and participant behaviors on students' perceived learning and satisfaction with delivery medium in Web‐based courses of an MBA program in the midwestern United States. Using finance as the referent discipline, we found statistically significant differences in the mean course outcomes (students' perceived learning and satisfaction with delivery medium) associated with 13 business disciplines. Although most of these disciplinary differences ceased to be significant predictors of student perceived learning as structural and behavioral characteristics were incorporated into the model, these differences remained significant predictors of perceived delivery medium satisfaction. We also found that some structural and behavioral characteristics were significant predictors of course outcomes, but in opposite directions. For instance, media variety was a positive predictor of delivery medium satisfaction but a negative predictor of perceived learning, while learner–learner interaction positively predicted perceived learning but negatively predicted delivery medium satisfaction. These findings suggest that instructors of online graduate courses must manage trade‐offs in balancing students' learning with their perceptions of the internet as a course delivery medium.     

湍流大气激光束扩展效应的研究

本文讨论了激光扩展的机制问题,给出了短期和长期扩展光斑半径ps和PL的均方值的近似计算方法,提供了一套测量短期扩展效应的技术,进行了在静态空气、湍流空气和暖风场下光束扩展的测量,所得结果与理论值比较吻合,光束扩展谱的统计分布近似于正态分布。