截断B－样条小波分解

本文讨论有限区间截断Ｂ－样条小波分解，给出具体计算方法与分解公式，实践表明它是比一般有限区间样条小波更为简单的方法     

皖北旅游区旅游合作初步研究

阐述了区域旅游合作的内涵及意义,提出了区域旅游合作是我国旅游业可持续发展的必然选择;在分析了皖北旅游区旅游合作的可能性和必要性的基础上,探讨了这一区域旅游合作的空间组织模式和合作机制,提出了合作发展旅游的若干建议。     

动力学分光光度法测蚂蚁和水的痕量铁

利用痕量铁在pH=4.0的HAc-NaAc介质中能催化H2O2、氧化苯酚红的反应.在催化条件下,表观活化能增加55%的原理,建立了动力学分光光度法测定痕量铁的新方法.此法线性范围为0.1-0.8 μg/ml.     

应力敏感性承压含水层渗流规律研究

基于应力敏感性渗流特征,针对承压含水层完全井,建立了带有渗透率应力敏感性系数的渗流数学模型。计算结果表明随着应力敏感性系数系数的增大,水位降深-流量关系曲线逐渐偏离线性关系,应力敏感性系数越大,在相同的水位降深条件下,出水量越小;同时,随着应力敏感性系数的增大,水头损失幅度也增大,任一流量下,应力敏感性系数越大,靠近井底附近位置处的水头损失幅度也越大。     

传统养身功法与现代体育健身运动养身理念之比较

自古人们就注重养生,并为后世留下了众多的养身功法.随着社会的进步,人们对健康有了许多新的认识,健身活动更已成为许多人生活的重要组成部分.在人们的健身活动实践中,也不断形成和发展出许多新的理念.文章重点探讨了传统养生功法与现代体育健身运动养身理念的区别与联系,并探讨了两者对于现代人健康生活的促进意义,并对现代人的健身提出了合理化建议.     

哈工大"中华冰雪网"网站介绍及实施的意义

哈工大"中华冰雪网"是由哈工大体育部主办并独立制作完成的以冰雪项目为主导,以哈工大博士生、硕士生,以及本科生的体育选项课项目为辅的大型体育专业网站.它的建成,不仅丰富延伸了广大学生的体育课堂,实现了网络化教学,同时也为体育课教学模式的探讨开辟了一条新路.通过对该网站的简要介绍,阐明网站目的以及实施的重大意义.     

Specified-time bearing-based formation control of multi-agent systems via a dynamic gain approach

In this paper, the specified-time bearing-based formation control problem is investigated via a dynamic gain approach. Both the leader-follower and leaderless cases for single- and double-integral multi-agent systems are considered with bearing measurement, respectively. By considering the communication graph as bearing rigid, distributed bearing-based controllers with a time-varying gain are designed. By using time transformation method and Lyapunov stability theory, the close-loop systems under the proposed protocols can achieve the target formation within the specified time. Comparing with some existing results, the proposed approaches can make multi-agent systems converge to the desired formation within any preset time without dependence on the initial conditions or system parameters. Finally, some simulations and experiments are presented to demonstrate the effectiveness of the proposed algorithms.     

Determination of theophylline concentration in serum by chemiluminescent immunoassay

INTRODUCTION Theophylline is one of the antiasthmatic drugs commonly used in a clinic.The individual difference of its bio-availability and the elimination rate in vivo is very large(Vergin et al.,2003).Its valid blood drug level is10~20mg/L,and it has a narrow safety range(Dawson and Whyte,1999;Li et al.,2000).As it is apt to result in the serious side-effect if the blood drug level exceeds20mg/L,monitoring the blood drug level of theophylline is necessary.In many different methods fo…     

Protective effect of recombinant Lactobacillus plantarum against H2O2-induced oxidative stress in HUVEC cells

This study probed the protective effect of recombinant Lactobacillus plantarum against hydrogen peroxide(H_2O_2)-induced oxidative stress in human umbilical vein endothelial cells(HUVECs). We constructed a new functional L. plantarum(NC8-p SIP409-alr-angiotensin-converting enzyme inhibitory peptide(ACEIP)) with a double-gene-labeled non-resistant screen as an expression vector. A 3-(4, 5-dimethyl-2-thiazolyl)-2, 5-diphenyl-2 H-tetrazolium bromide(MTT) colorimetric assay was carried out to determine the cell viability of HUVEC cells following pretreatment with NC8-p SIP409-alr-ACEIP. Flow cytometry(FCM) was used to determine the apoptosis rate of HUVEC cells. Cysteinyl aspartate specific proteinase(caspase)-3/8/9 activity was also assayed and western blotting was used to determine protein expression of B-cell lymphoma 2(Bcl-2), Bcl-2-associated X protein(Bax), inducible nitric oxide synthase(i NOS), nicotinamide adenine dinucleotide phosphate oxidase 2(gp91 phox), angiotensin II(Ang II), and angiotensin-converting enzyme 2(ACE2), as well as corresponding indicators of oxidative stress, such as reactive oxygen species(ROS), mitochondrial membrane potential(MMP), malondialdehyde(MDA),and superoxide dismutase(SOD). NC8-p SIP409-alr-ACEIP attenuated H_2O_2-induced cell death, as determined by the MTT assay. NC8-p SIP409-alr-ACEIP reduced apoptosis of HUVEC cells by FCM. In addition, compared to the positive control, the oxidative stress index of the H_2O_2-induced HUVEC(Hy-HUVEC), which was pretreated by NC8-p SIP409-alr-ACEIP, i NOS,gp91 phox, MDA, and ROS, was decreased obviously; SOD expression level was increased; caspase-3 or-9 was decreased, but caspase-8 did not change; Bcl-2/Bax ratio was increased; permeability changes of mitochondria were inhibited; and loss of transmembrane potential was prevented. Expression of the hypertension-related protein(Ang II protein) in HUVEC cells protected by NC8-p SIP409-alr-ACEIP decreased and expression of ACE2 protein increased. These plantarum results suggested that NC8-p SIP409-alr-ACEIP protects against H_2O_2-induced injury in HUVEC cells. The mechanism for this effect is related to enhancement of antioxidant capacity and apoptosis.     

国家综合档案馆数字档案资源建设策略探析

基于提升服务质量的导向,综合档案馆需要探索与实施数字档案资源建设的新策略。总结国内外部分数字资源建设实践的成功经验,提出了引入公众参与、开展跨界合作、注重新技术应用、实行项目化运作、共建共享资源五个方面的策略。