波动方程的混合问题     

张健 《青海师专学报》2007,27(5):30-32

本文应用拉普拉斯变换,求出了一个波动方程第二边界条件的混合问题的解.  相似文献   

秀珍菇原生质体的分离与再生的研究     

万南安 《岳阳职业技术学院学报》2006,21(5):69-70

通过对秀珍菇原生质体的分离与再生的影响因素的试验研究,表明以0.6M甘露醇为渗稳剂用1%纤维素酶 1%蜗牛酶,30℃酶解3～4小时原生质体产生最高,原生质体再生则以0.6M甘露醇或0.6M蔗糖为渗稳剂较好。  相似文献   

Lonely schools: the relationship between geographic isolation and academic attainment     

Evan Odell 《Educational research; a review for teachers and all concerned with progress in education》2017,59(3):257-272

  相似文献   

Performance of the geometric approach to fault detection and isolation in SISO, MISO, SIMO and MIMO systems     

RAHIMI N SADEGHI M. H. MAHJOOB M.J. 《浙江大学学报(A卷英文版)》2007,8(9):1443-1451

In this paper,a geometric approach to fault detection and isolation (FDI) is applied to a Multiple-Input Multi-ple-Output (MIMO) model of a frame and the FDI results are compared to the ones obtained in the Single-Input Single-Output (SISO),Multiple-Input Single-Output (MISO),and Single-Input Multiple-Output (SIMO) cases. A proper distance function based on parameters obtained from parametric system identification method is used in the geometric approach. ARX (Auto Regressive with eXogenous input) and VARX (Vector ARX) models with 12 parameters are used in all of the above-mentioned models. The obtained results reveal that by increasing the number of inputs,the classification errors reduce,even in the case of applying only one of the inputs in the computations. Furthermore,increasing the number of measured outputs in the FDI scheme results in decreasing classification errors. Also,it is shown that by using probabilistic space in the distance function,fault diagnosis scheme has better performance in comparison with the deterministic one.  相似文献   

Action learning sets and social capital: ameliorating the burden of clergy isolation in one rural diocese     

Judith A. Muskett  Andrew Village 《Action Learning: Research and Practice》2016,13(3):219-234

Rural clergy often lack colleagues and may struggle with isolation, especially if over-extended in multi-parish benefices. Theory suggests that this sense of isolation could be addressed by launching clergy action learning sets, which have the potential to establish a peer support network through the formation of social capital as a by-product of the pedagogical process. This case study looks at the effect of action learning set membership upon clergy involved in a new ministry development programme in one rural Church of England diocese. Markers of social capital (networks, norms and social trust) were found among set members, some of whom were prepared to draw on the new resource for assistance with problems, while others were ready to support such colleagues. Pre-existing support networks were one reason for clergy not intending to capitalize on the new links; another was the geographically dispersed set memberships. Geography may militate against exploiting social capital, but a distance of many miles between priest and trusted confidant can be advantageous. The study demonstrates that the notion that social capital formed through action learning will ameliorate isolation among some geographically scattered clergy is grounded not only in theory but also in practice.  相似文献   

刚架水平振动分析和振动控制     

Han Yinquan) Cui Chunxia) 《石家庄铁路工程职业技术学院学报》2006,(4)

结构振动现象随处可见,振动控制技术可有效避免一些振动诱发灾害。为便于掌握结构振动控制的基本思想,由简单的两层刚架水平振动分析入手,动力方程利用直接求解法,逐步引导出两类振动控制的设计思路,基底隔震结构和TMD控制结构。  相似文献   

高寒地区小型水电站防冰冻运行发电措施的探讨     

吴文斌 《杨凌职业技术学院学报》2005,4(1):8-11

本文对冬季高寒地区小型水电站,防冰冻运行发电措施及对冰的形成进行了分析研究,对上游浮冰进入引水渠道进行了隔离措施(在西藏自治区当雄县水电站进行了实验),对高寒区小型水电站冬季运行存在的问题,进行了深入的研究,采用了三种方法措施,保证小型水电站在冬季正常运行。  相似文献   

A Blast Shock Isolation System with MRFD and Its Semi-Active Control Analysis     

LIU Jingbo  WANG Libin  DU Yixin  WANG Yan 《天津大学学报(英文版)》2006,12(Z1)

To effectively reduce the damage to people and devices in civil defense engineering subjected to blast shock, a blast shock isolation system with magnetorheological fluid dampers (MRFD) is proposed. MRFD can provide continuously adjustable Coulomb friction and has many advantages for semi-active control. Numerical simulation of this isolation system is finished using Matlab simulink toolbox. General semi-active control algorithms are consided based on instantaneous optimal active control algorithm. And the results indicate that the shock isolation system can work efficiently, decreasing about 93% of the peak acceleration of the isolation floor.  相似文献   

隔震技术与应用   总被引：2，自引：0，他引：2  

马卫华  郝婷玥  李晓芝 《唐山学院学报》2005,18(3):104-106

介绍了几种隔震技术的工作原理及应用情况,总结了我国隔震技术的应用现状及发展前景。  相似文献   

多媒体课堂教学中介质阻隔问题的研究与探讨     

杨慧玉  孙临君 《中国教育技术装备》2007,(9):6-8

在多媒体课堂教学活动中,由于不能恰当、灵活地运用多媒体介质,使多媒体不但不能提高教学效果,反而成为教学的干扰源,阻隔了教学流的顺畅流转,使师生之间教与学的互动作用被割裂,严重地影响了教学效果和教学质量。本文通过对介质阻隔问题的研究,提出了适宜的解决方案。  相似文献