污水排海管扩散器中盐水楔阻塞的研究

通过物理模型试验，研究了污水排海管扩散器中盐水楔阻塞的形成和冲洗的机理以及影响因素；建立了盐水楔阻塞的临界冲洗流量及相应的临界密度弗劳德数的理论计算模式，并在试验中得到了很好的验证     

带压堵漏技术在供水管道抢修中的应用

介绍马鞍管卡的构造、特点及其使用,指出在带压堵漏中应注意的问题。     

An IEEE 802.3 Compatible Real Time Medium Access Control with Length-based Priority

IntroductionEthernet has become the most successful LANtechnology today .It is even regarded as the core to conceiveunified data communication systemin the future . However ,due to the non-deterministic essence of CSMA/CD,Ethernetis unsuitable for applications with stringent ti me constrains ,as inindustrial floors , where violation of such requirementswill result in great degradation of system performance oreven make whole systemparalyzed .Determinismproblemhas been studiedinthelast decad…     

污水排海管扩散器中海水循环阻塞的研究

通过物理模型试验，研究了海水入侵具有上升管的扩散器形成循环阻塞的机理和影响循环阻塞冲洗的因素，建立了循环阻塞的临界冲洗流量及相应的临界密度佛荣德数的理论计算模式，并在试验中得到了很好的验证。     

钙拮抗剂的临床应用

钙拮抗剂是一类化学结构不同，但都是能阻滞细胞膜上钙通道，防碍钙离子内流的药物。本文综述了近年来经临床验证较为有效的钙拮抗剂的临床用途。     

对关联及科里奥利力对准粒子能谱的影响

本文利用简化的HFB推转Hamiltonian,求出了对力、Coriolis力对准粒子能谱的影响,且用PNC理论对HFB中所作的近似作了估计.     

基于改进的混合免疫算法的动态信道分配

为保证在蜂窝移动通信网络中信道间最大程度的紧致分配,降低语音呼叫堵塞率和掉话率,提出了一种改进的混合免疫算法,并将其应用于动态信道分配中.该算法采用自适应的初始化种群、交叉和重组算子、改进的选择性变异技术和改进的疫苗接种方法.在话务量增加80%时,算法的堵塞率和掉话率分别为3.48%和1.90%,平均收敛代数仅为9.98次.仿真结果表明,改进后的算法有效地提高了收敛率,减少了算法收敛所需的运行代数;明显地降低了语音呼叫的堵塞率和掉话率,有更强的话务携带能力.     

高效铝-胺基封堵防塌钻井液体系探讨*

为了阻缓泥岩中孔隙压力传递、提高泥岩井壁稳定性,研制出了新型腐植酸–铝封堵防塌剂。泥岩压力传递测试结果表明,腐植酸–铝（HA–Al）较聚合醇和硅酸盐更能有效阻缓泥岩中的压力传递,与其作用后的泥岩样品中传递1 MPa的压差需要20.0 h,较作用前的泥岩（约为1.5 h）有大幅度提高。将腐植酸–铝与聚胺两种新型井壁稳定剂优化组合,构建了高效铝–胺基封堵防塌体系,该体系抗氯化钠达8%以上,抗钙能力在1.0%以上,抗劣土达8%以上,抗温能力处于150℃以上,180℃以下,具有较优的耐温能力、流变性、滤失性、抑制性、抗污染性能以及抗温耐温性能。     

Analysis of proteins that interact with nucleocapsid protein of SARS-CoV using 1 5-mer phage-displayed library

Analysis of proteins that interact with N protein of SARS-CoV using 15-mer phage-displayed library will help to explore the virus pathogenesis and to develop new drugs and vaccines against SARS. In this study, we cloned, expressed and purified N protein of SARS-CoV. This 46-kD N protein was verified by SDS-PAGE and Western-blot. Then, the peptides binding-specific to N protein were identified using 15-mer phage-displayed library. Surprisingly, all of the 89 clones from monoclonal ELISA were positive （S/N〉2.1） and the result was further confirmed experimentally once again. Six N protein-binding peptides, designated separately as SNA1, SNA2, SNA4, SNA5, SNA9 and SNG11, were selected for sequencing. Sequence analysis suggested that SNA5 shared approximatively 100% sequence identity to SNA4, SNA2, SNA9 and SNA1. In addition, the binding specificity of the 15-mer peptides with the SARS-CoV N protein was further demonstrated by blocking ELISA using the synthetical 15-mer peptide according to the deduced amino acid sequence of SNA5. Also, the deduced amino sequence of SNA5 was compared with proteins in translated database using the tblastx program, and the results showed that the proteins with the highest homology were Ubiquinol-cytochrome c reductase iron-sulfur subunits （UCRI or UQCR）, otherwise known as the Rieske iron-sulfur proteins （RISP）. Notablely, in the [2Fe-2S] redox centre of UCRI, there were 6 residues [GGW（Y）F（Y）CP] compatible to the residues （position 2→7, GGWFCP7） of the NH2-terminal of the 15-mer peptide, which indicated higher binding specificity between the N protein of SARS-CoV and the redox centre of UCRI to some extent. Here, the possible molecular mechanisms of SARS-CoV N protein in the pathogenesis of SARS are discussed.     

波长路由WDM光网络阻塞率的分析与计算

波长路由的全光网络可以在很广的范围内提供骨干网的连接并运行于极高的速度之上.对波长路由的WDM光网络引入两种分析模型,即独立模型和关联模型,分别对L跳路径的阻塞率进行了分析计算;研究了全网平均阻塞率的计算,对研究的一些结论做出了讨论.