用瞬态激励法标定压力传感器参考灵敏度

介绍一种用瞬态激励法测定压力传感器参考灵敏度的方法.通过对已知和未知力传感器频谱、频响函数幅值及相位图等的分析,测定未知力传感器的参考灵敏度.此法测试简单,对木材工业的结构动力学测试工作具有一定的实用价值.     

近海拖网渔船机舱布置实例

近海拖网渔船虽然主尺度小,但动力装置比较复杂,机舱内的设备也较多,如何利用好有限的空间,在满足各方面要求的前提下,合理安排各机械设备的相互位置,作者给出了机舱布置的具体实例。     

抗日根据地基层权力结构变迁初探——以抗战时期晋西北根据地为例

抗日根据地基层权力结构的嬗替不是一蹴而就的，它是由初期的利用传统权威，到中期的培养新式权威，再到后期利用基层“村选”来实现新旧权威的替换，它经历了整个抗战时期。在此过程中，中共不仅实现了行政人员的替换，而且进一步完成了乡村社会的整合。中共培植起来的劳模英雄成为乡村社会新式权威，在政治运行和社会运动中发挥了核心作用，乡村社会从此被彻底发动起来了。     

关于基层支行领导班子建设的思考

加强银行基层机构领导班子建设,培养德才兼备的领导干部是金融事业成功的关键。作为一个基层行的领导班子,如何把党和国家的各项方针、政策、规章制度以及上级行决策部署不折不扣地落到实处,是一项重要的任务。本文分析论述了基层支行领导班子建设的重要意义,以及基层支行领导班子建设的重点和目标,探讨如何加强基层支行领导班子建设,并提出基层支行领导班子建设的建议措施。     

关于农网改造工程两个突出问题的探讨

文章作者为多年网改工作技术管理工作多年,作者针对10KV电缆套管敷设保护管的优化选择和改造后漏电保护器的安装与管理等两个突出问题进行分析,并提出解决措施,以确保电网安全、稳定运行,提高供电质量和供电可靠性.     

输变电工程造价控制

电力工程造价的控制和管理是电力基本建设投资管理的重要内容。从输变电工程建设的实际情况出发,对输变电工程造价超支等方面存在的问题进行分析,提出一些应对措施和建议,为今后的工程造价控制与管理提供一些参考。     

天津市农村劳动力文化程度历史变迁研究

分析了天津市1978~2010年农民教育的历史沿革及现状,研究了天津市农村劳动力文化程度的变化并探讨了天津市农村农民教育存在的问题。在此基础上,从转变农民教育观念、政府管理、投资、培训模式等方面提出了政策建议。     

Nitrogen accumulation in nodulated and non‐nodulated pea plants,grown in a sandy soil at different acidities

Abstract

The growth of nitrate‐supplied and dinitrogen‐fixing pea plants was studied in a pot experiment with a sandy soil in a pH‐H_?O range from 3.4 to 5.6. Optimum growth in both treatments occurred at pH 5.0. At low pH, N₂‐plants yielded significantly less than NO₃‐plants. Planting of nodulated seedlings did not enhance yield in comparison with sowing in inoculated soil, indicating that nodulation was not the most sensitive process in restricting yield. Comparison of the nitrogen contents of shoots of planted and sown N₂‐plants allowed the suggestion that the synthesis of nitrogenous compounds was also not limiting yield. At low pH, root growth was severely reduced in dinitrogen‐fixing plants in comparison with nitrate‐supplied plants. This difference could be explained by the influence of the form of nitrogen nutrition on the cation‐anion uptake pattern of the plant and the resulting pH‐shift in the rhizosphere. It is to be expected that in an acid soil under field conditions the indirect effect of nitrate on root growth and nodulation via increase of the pH is more extensive than its direct negative effect on nodulation.     

The effect of tibial plateau leveling osteotomy position on cranial tibial subluxation: an in vitro study

OBJECTIVES: To compare centered versus distal tibial plateau leveling osteotomy (TPLO) position on cranial tibial subluxation, postoperative tibial plateau angle (TPA), and tibial long axis shift (TLAS). STUDY DESIGN: In vitro biomechanical evaluation. ANIMALS: Six pairs of canine cadaveric hind limbs. METHODS: One limb of each pair was randomly assigned to the distal (TPLO-D) or centered (TPLO-C) osteotomy group. Cranial tibial subluxation (CTS) under load was quantified sequentially under 3 conditions: intact, after cranial cruciate ligament transection, and after TPLO; a corrected CTS value was also calculated. Postoperative TPA and TLAS were measured. Comparisons were made using 1-way repeated measures ANOVA with a Tukey's multiple comparison post hoc test for CTS, and a Wilcoxon's sign rank test for TPA and TLAS. Significance was set at P<.05. RESULTS: TPLO-C had a significantly lower mean CTS than TPLO-D (P<.01). Corrected CTS was also significantly lower in TPLO-C than in TPLO-D (P<.001). Postoperative TPA and TLAS were less in TPLO-C than in TPLO-D (P=.0312). CONCLUSION: Our results confirm that distal centering of the TPLO leads to craniodistal translation of the tibial plateau, TLAS, and a postoperative TPA that is greater than expected. This geometric effect has the biomechanical effect expected of inadequate tibial plateau leveling, namely incomplete neutralization of cranial tibial thrust. CLINICAL RELEVANCE: The centered osteotomy position is geometrically more precise, and biomechanically more effective than the distal position.     

西方权力制约途径之检讨--从福柯的权力立场出发

迄今为止,权力制约途径主要有二一是"以权力制约权力",二是"以社会制约权力".从福柯式的权力立场出发,对权力的法律化概念进行了反思,以此为起点,检讨了西方权力制约的两条途径.其中,认为立法权、行政权与司法权的分立与制衡构成了"以权力制约权力"的核心,而"以社会权力制约国家权力"则成为现代西方权力制约途径的发展趋势.最后,文章指出,西方的权力制约途径既有宏观的,也有微观的,西方现代社会的权力制约权力途径已形成了一项系统性机制.