Solutions of Two-point BVP in Banach Spaces

IntroductionGuoetal.[1]discussedthetwo-pointboundaryvalueproblem(BVP)forordinarydifferentialequationsinBanachspaces,-u″=f(t,u),　t∈I=[0,1]u(0)=u(1)=0andgavesomeconclusions.Usingthemonotoneiterationtechnique,SongFumindiscussedthesameBVP[1]andshoweditsmaximalandminimalsolutions[2].Inmoregeneralboundaryvaluecondi-tions,GuoandSun[3]discussedBVPinreflexiveBanachspacesandmadeseveralconclusions.InthisworkthefollowingBVPinrealBanachspace,E,isconsidered.Lu(-p(t)u′)′ q(t)u=f(t,u),B0uau(0)-…     

神经网络多参数诊断法

讨论了机械故障诊断中采用多参数诊断法的必要性,阐述了神经网络理论用于多参数诊断的理论依据,归纳了神经网络多参数诊断法的实施步骤,并以滚动轴承故障诊断为例,对该方法进行了实验验证,证明了该方法的实用性。     

热动力学研究的时间参量法(Ⅲ)——简单级数反应的热谱面积比法

根据热导式量热计的理论基础——Ｔｉａｎ′ｓ方程,将时间作为已知参量,提出了一种新的热谱数据解析方法——简单级数反应的热谱面积比法．应用该法研究了几种简单反应的热动力学,实验结果验证了热谱面积比法的正确性．     

Molecular evidence for increased hematopoietic proliferation in the spleen of the b/b laboratory rat

The splenomegaly and the appearance of a significant number of CFU-E (erythroid colony-forming units) and BFU-E¹ (erythroid burst-forming units) in the Belgrade laboratory rat (b/b) spleen prompted us to analyse further the molecular evidence for increased hematopoietic proliferation in the b/b spleen. Messenger RNAs (mRNAs) specific for globins, proteins for iron transport and deposition and the band 3 protein were used in rat erythropoietic tissues as markers for proliferation and erythroid differentiation. In the b/b spleen, all mRNAs analysed display an erythroid-specific pattern of expression. This analysis also revealed an enhanced level of mRNA for ferritin in the +/b spleen, whereas erythrocyte-specific mRNA production was normal.     

Migration of lymphoid cells to the bone marrow of rat following eradication of cells in DNA synthesis and in mitosis

Summary Eradication of replicating bone marrow cells of rat by means of combined administration of single doses of hydroxyurea and vinblastin is followed within 9–10 h by an inflow of lymphoid cells of extramedullary origin in the range of 13,200,000/femur. The rat bone marrow with a high content of lymphoid cells was previously shown to be concentrated in stem cells. The factor(s) which convey the information of decrease of replicating marrow cells to extramedullary sites is at present unknown.Acknowledgment. This study was supported by a grant from the Chief Scientist Office, Ministry of Health, Israel.Hydroxyurea for this investigation was given as a gift by the Squibb Institute of Medical Research, Princeton, N.J. USA, to which the authors are indebted.     

Experimental desquamation of intestinal epithelium for in vivo studies of regeneration

Summary Complete removal of villous as well as upper-crypt epithelium was achieved in vivo by vibration of an intestinal segment using tetraphenylboron sodium (TPB) as a disassociation agent.Acknowledgments. The authors thank Hicol Industrieterrein De Bosschen for supplying TPB. Research was supported by MR-II 1.3.14.p.2 grant.     

Leydig cell function in streptozotocin-induced diabetic rats.

Streptozotocin diabetic rats were infertile as a result of decreased Leydig cell function of the testes. The major changes found were: decreased number of Leydig cells and their spontaneous secretion of testosterone. No change in the receptors to LH on the Leydig cells was observed. LH was found to be obligatory for the regulation of Leydig cell function and fertility.     

无刷直流电机模糊控制系统的建模与仿真

从无刷直流电机的基本原理出发,提出了无刷直流电机控制系统仿真建模的新方法.该方法在Mat-lab/Simulink中按功能进行模块化建模,用M文件来编写功能函数,实现了电流滞环和转速模糊控制的双闭环调速系统的仿真.利用该模型分析了电机的动静态性能,得到了电机运行时的反电动势、相电流、转矩和速度曲线,与一般比例积分与微分控制相比,系统响应时间缩短一半,且无超调,具有较强的鲁棒性和自适应能力.该模型准确易行,便于替换和修改,为今后分析该类电机和对其控制策略的研究提供了新的方法.     

SQL注入漏洞的分析及防范

阐述了SQL注入的原理,对SQL注入的一般思路进行了详细分析;通过整形参数和字符串参数来判断是否存在注入漏洞,再通过判断数据库类型和数据库表名及字段名来达到注入的不同目的;介绍了多种注入方式,并从服务器管理员和程序员2个方面对SQL注入漏洞提出了防范措施。     

论信息环境变化下的高校图书馆信息服务工作

论述当前信息环境变化的新特点，分析这一变化给高校图书馆信息服务工作带来的新要求和新问题，并针对这些新问题，提出改进信息服务工作的新举措。