一类二阶非线性时滞脉冲微分方程解的振动性质

利用Lakshmikantham等人建立的脉冲微分不等式讨论了一类二阶非线性脉冲微分方程解的振动性质,获得了此类方程振动所应具备的充分条件,改进了一些已知的结果,并用一个具体的例子说明了脉冲项对微分方程的振动性有很大的影响.     

一类脉冲中立型抛物方程解的强迫振动性

讨论了一类具有连续分布滞量的脉冲中立型抛物方程解的强迫振动性，利用微分不等式方法将所讨论的脉冲中立型偏微分方程转化为脉冲中立型时滞微分方程的问题，获得了其一切解振动的充分性判据；将脉冲中立型微分方程的振动性质推广到具时滞的脉冲中立型偏微分方程．     

一类奇数阶非线性脉冲微分方程的振动性与渐近性

研究了一类奇数阶非线性脉冲微分方程解的振动和渐近性态.应用脉冲微分不等式和Ricatti变换,得到这类奇数阶非线性脉冲微分方程或者振动,或者渐近的若干充分性判定定理.     

二阶线性脉冲微分方程的振动性

研究一类二阶线性脉冲微分方程解的振动性,揭示了此类方程与相应的非脉冲方程在振动性方面的联系．     

脉冲中立型时滞抛物偏微分方程组的振动准则

讨论了一类脉冲中立型时滞抛物偏微分方程组的振动性质,运用脉冲微分不等式和积分的方法,获得了其所有解振动的一些充分条件.     

二阶非线性脉冲微分方程的振动性

利用R iccati变换、函数平均法和辅助函数,讨论了一类带脉冲二阶非线性时脉冲微分方程解的振动性,并得到了这类方程所有解振动的一组充分条件.     

脉冲中立抛物型偏微分方程振动的一个充要条件(英文)

研究一类脉冲中立抛物型偏微分方程的振动性,借助Green散度定理和脉冲中立型微分方程,得到了该类方程在Dirichlet边界条件下所有解振动的一个充要条件。     

二阶非线性脉冲时滞微分方程的振动性

讨论了二阶非线性脉冲时滞微分方程的振动性.在文献[1]的基础上,引入函数r(t),利用脉冲微分不等式和Riccati变换,从而得到方程振动的条件,结果推广了原有文献中的结论。     

一类拟线性脉冲时滞双曲系统的（强）振动性

讨论一类具拟线性扩散项的脉冲时滞双曲系统解的（强）振动性质,利用脉冲微分不等式,得到了该类系统在Neumann边值条件下所有解（强）振动的若干充分条件。     

脉冲时滞差分方程振动的充分条件

本文讨论一类脉冲滞差分方程的振动性,得到了它的所有解振动的充分条件。     

钢筋砼L-形截面双向拉弯构件正截面承载力的研究

对钢筋砼 L-形截面双向拉弯构件的正截面承载力进行了研究 ,还对三根钢筋砼 L-形截面双向拉弯构件进行了试验研究 .编制了计算机程序 ,可用于各种类型截面的计算 ;并用此程序对 L-形截面在双向拉弯作用下的 N- M相关曲线、等轴力下的 Mx- My相关曲线进行了计算分析 ,理论计算结果与试验结果吻合较好     

二阶非线性阻尼微分方程解的振动性质

本文讨论了二阶非线性阻尼微分方程 (a(t)Ψ(x(t))x′(t))′+p(t)x′(t)+q(t)f(x(t))=0的解的振动性质。在一定条件下,建立了方程(1)的有五个新的振动性定理。推广和改进了已知的一些结果。     

527株解脲脲原体的分布及药敏结果分析

目的分析襄阳市泌尿生殖道感染患者解脲脲原体（Uu）感染情况及药敏试验结果,以指导临床合理用药。方法使用支原体培养、鉴定及药敏试剂盒对泌尿生殖道感染患者进行Uu培养,培养阳性者做药物敏感试验,并对试验结果进行分析。结果在Uu感染患者中,以20～40岁（87.10%）患者为主要感染人群,女性（57.31%）多于男性（42.69%）;对10种常用药物药敏试验结果显示对克拉霉素、强力霉素、罗红霉素敏感率较高,依次是92.60%、81.02%、73.62%。而对司帕沙星、氧氟沙星耐药性较高,依次是71.16%、42.70%。结论 Uu引起的泌尿生殖道感染及其耐药性问题应引起临床高度重视,Uu已对常规抗生素产生较高的耐药性,临床医生应根据药敏试验结果合理使用抗生素,建议襄阳地区对Uu感染者可以首选克拉霉素,强力霉素进行治疗。     

L2(Rd)上Gabor框架的一个充分条件

研究了L2(Rd)上的以矩阵平移和调制的Gabor框架的一个充分条件.首先在时域上给出了以矩阵平移和调制的Gabor框架恒等式的证明,然后给出了Gabor框架的一个充分条件的证明.最后在频域上也给出了相应的结论.     

基于变周期三角函数—灰色GM(1，1)模型的设备故障间隔时间预测

针对设备故障预测模型难以精确建立的特点,为提高故障间隔时间预测的精确度,提出了变周期三角函数-灰色模型GM(1,1)的预测方法。该方法在三角函数-灰色模型GM(1,1)基础上,建立了变周期三角函数—灰色GM(1,1)的组合模型,实现了对设备故障间隔时间的预测;并将预测结果与三角函数-灰色模型GM(1,1)进行对比,结果表明,采用变周期三角函数-灰色模型GM(1,1)对故障间隔时间进行预测,其预测结果的相对误差由24.16%降到3.24%,提高了预测结果的精度。     

Technological Pedagogical Content Knowledge (TPACK) Literature Using Confidence Intervals

The validity and reliability of Technological Pedagogical Content Knowledge (TPACK) as a framework to measure the extent to which teachers can teach with technology hinges on the ability to aggregate results across empirical studies. The results of data collected using the survey of pre-service teacher knowledge of teaching with technology (TKTT) were synthesized using confidence intervals (CIs). Mean pre-service teacher TPACK point estimates were characterized by graphing CIs across studies from 2009 until 2011. The results present approximations of TPACK population parameters and implications for researchers and teacher educators.     

The overall knowledge of genetics in Serbian speech and language pathologists

ABSTRACT

An increase in the number of children with speech–language pathology also having a genetic disorder imposes the need for speech and language pathologists (SLPs) to have sufficient knowledge about genetic basis of speech–language disorders. Research aim was to estimate in Serbian SLPs different aspects of theoretical and practical knowledge about intercorrelation of genetics and speech and language pathology and to compare obtained results with the results of SLPs in the United States. The questionnaire from Tramontana’s study was used in our study. Comparison of the results that obtained in our study with those in Tramontana’s study has shown that our study respondents have higher General Knowledge Index (78.6%: 66.2%), higher mean confidence summary score (22.2: 16.7) and higher mean score of ‘overall’ attitudes about genetics and its relation with communication disorders (20.8: 13.6). Differences which emerge from educational programmes, educational levels and practical experience in the observed groups are indicated as possible causes of differences in the obtained results. On the basis of the obtained results, it may be concluded that it is necessary to elevate SLPs’ level of general knowledge about genetics and to acquire their knowledge through clinical practice.     

Strengthening reinforced concrete beams using prestressed glass fiber-reinforced polymer-Part II:Analytical study

INTRODUCTION When the flexural load-carrying capacities of existing R. C. or P. C. structures are not sufficient for the service loads, structural strengthening becomes necessary. Using steel plates to strengthen concrete members is a traditional method (Raithby, 1980) and is still an important and popular way at the present time. Fiber-reinforced polymer (FRP) sheets and plates have been used recently as an alternative to steel plates for strengthening concrete structures be-cause th…     

GFRP布与钢筋混凝土梁界面之间应力行为

为了解玻璃纤维(GFRP)布与钢筋混凝土梁界面之间的粘结性能,进行了7根GFRP布加固的钢筋混凝土梁与2根对比梁的试验研究.试验的变化参数为GFRP布层数、粘结长度及配筋率.试验结果表明,GFRP布加固的钢筋混凝土梁极限荷载显著提高,但是发生剥离破坏的试验梁极限荷载有所降低,粘结长度是影响加固梁剥离破坏的主要因素.根据试验结果提出了GFRP布与钢筋混凝土梁界面粘结剪应力的试验分析方法并分析了界面间粘结剪应力的分布.同时,提出了GFRP布加固的钢筋混凝土梁剥离正应力与粘结剪应力的理论分析方法.最后,给出了GFRP布加固钢筋混凝土梁剥离荷载的计算方法.为验证理论分析方法的正确性,计算了试验梁界面间的粘结剪应力、剥离正应力及剥离荷载.计算结果表明,所提出的理论分析方法与试验值吻合较好.     

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

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.