转子动不平衡载荷的在线识别

本文提出用复模态影响系数来解决转了大衡的在线以别和诊断问题，讨论了影响系数矩阵的力学意义．试验中可不加试重求出影响系数，并编制了相应的计算程序．     

大学生英语交际能力的培养

培养学生用英语进行交际的能力是大学英语教学的重点。要提高学生的交际能力 ,就要注意学生听说能力的培养 ,这需要我们教师从课堂教学入手。     

论大学生的消费心理与艰苦奋斗的革命传统教育

目前在大学生中存在着盲目消费的趋势,因此,经常对大学生进行艰苦奋斗的革命传统教育,就成为我们思想政治工作中的一项重要任务。     

对三农问题的哲学思考

农业在国民经济中的重要性众所周知。本文通过对最能体现农业重要性的例子、四大文明的诞生和英国的工业革命等人类文明史的阐述,用哲学的思维对当代中国的农业、农村、农民做了初步的探讨。     

基础设施定价与城市规模的经济分析

建立了基础设施与城市规模的时间序列动态模型，分析基础设施市场化运营中，因定价收费方式不同，理论上对城市最优规模的影响。对比分析了基础设施以边际成本定价和以平均成本定价的区别，用数值模拟的方法，得出按照基础设施边际成本定价，有利于获得最优的城市规模和实现城市收益最大化的结论，并为城市发展提供了相应对策。     

Bootstrap Estimation of Benchmark Doses and Confidence Limits with Clustered Quantal Data

The benchmark dose (BMD) is an exposure level that would induce a small risk increase (BMR level) above the background. The BMD approach to deriving a reference dose for risk assessment of noncancer effects is advantageous in that the estimate of BMD is not restricted to experimental doses and utilizes most available dose-response information. To quantify statistical uncertainty of a BMD estimate, we often calculate and report its lower confidence limit (i.e., BMDL), and may even consider it as a more conservative alternative to BMD itself. Computation of BMDL may involve normal confidence limits to BMD in conjunction with the delta method. Therefore, factors, such as small sample size and nonlinearity in model parameters, can affect the performance of the delta method BMDL, and alternative methods are useful. In this article, we propose a bootstrap method to estimate BMDL utilizing a scheme that consists of a resampling of residuals after model fitting and a one-step formula for parameter estimation. We illustrate the method with clustered binary data from developmental toxicity experiments. Our analysis shows that with moderately elevated dose-response data, the distribution of BMD estimator tends to be left-skewed and bootstrap BMDL s are smaller than the delta method BMDL s on average, hence quantifying risk more conservatively. Statistically, the bootstrap BMDL quantifies the uncertainty of the true BMD more honestly than the delta method BMDL as its coverage probability is closer to the nominal level than that of delta method BMDL. We find that BMD and BMDL estimates are generally insensitive to model choices provided that the models fit the data comparably well near the region of BMD. Our analysis also suggests that, in the presence of a significant and moderately strong dose-response relationship, the developmental toxicity experiments under the standard protocol support dose-response assessment at 5% BMR for BMD and 95% confidence level for BMDL.     

江泽民同志关于“文化纽带”的重要论述

江泽民同志对文化纽带的两次深刻论述 ,主要是针对祖国统一和维护世界和平、促进共同发展的历史任务 ,强调了中华文化团结人民、凝聚人心的巨大作用。因此 ,文化纽带的内涵 ,实质就是中华文化的凝聚力问题。这是我们必须继承的宝贵精神财富 ,也是推进民族复兴大业的极为重要的力量     

新中国成立之初的外交形象塑造

面对驱除旧中国屈辱的外交形象和赢得国际社会理解与认同的要求,新中国提出了主动塑造外交新形象的思想,设计了新的外交形象的基本内涵,规定了塑造者的基本素质,确立了塑造的基本原则,对外交形象作了全新的塑造,使新中国获得了并不完全与国力相称的良好的外交形象。     

论太平天国时期的周庄枪匪集团

:以费秀元、费金绶父子为首的周庄枪匪集团 ,是清末太湖地区众多枪匪中势力较大的一支。费氏通过捐输取得官衔、功名 ,约束土匪劣性 ,获地主士绅和清政府的支持。太平军攻占苏州后 ,该集团负隅顽抗 ,继而被迫假意受抚 ,最终公开投降清军。在李鸿章率淮军攻占太平天国苏福省的战斗中 ,周庄枪匪绘呈地图、担任向导、随军作战 ,出力颇巨 ,后为李鸿章收编。     

传染性浆膜炎对鸭免疫功能的影响

本文报道鸭人工感染鸭疫里默氏杆菌后主要免疫器官的病理组织学研究结果 ,发现法氏囊、脾脏病理变化严重 ,胸腺的病变较轻微 ,血清中γ -球蛋白含量显著下降。结果表明 :鸭传染性浆膜炎对体液免疫功能有较大的影响