Output feedback stabilization of an unstable wave equation with observations subject to time delay

This paper focuses on boundary stabilization of a one-dimensional wave equation with an unstable boundary condition, in which observations are subject to arbitrary fixed time delay. The observability inequality indicates that the open-loop system is observable, based on which the observer and predictor are designed: The state of system is estimated with available observation and then predicted without observation. After that equivalently the authors transform the original system to the well-posed and exponentially stable system by backstepping method. The equivalent system together with the design of observer and predictor give the estimated output feedback. It is shown that the closed-loop system is exponentially stable. Numerical simulations are presented to illustrate the effect of the stabilizing controller.     

电除尘器本体结构的优化设计

根据电除尘器本体结构的特点，采用混合单元的办法对本体结构进行了有限元分析，采用约束变尺度法对电除尘器体结构进行了结构优化，用ＦＯＲＴＲＡＮ语言编制了本体结构优化设计程序，具有较强的功能和通用性。     

一种新型水处理方法——SBR法

通过介绍序批式活性污泥法（ＳＢＲ）用于污废水处理的原理、运行方式及优点，指出ＳＢＲ法在中小型常规污水处理领域较传统的连续流式活性污泥法（ＣＦＳ）有更广阔的应用前景，并将在一定程度上取代ＣＦＳ，降低建设成本和运行费用．     

浅谈建筑工程施工中的安全管理

文章从建筑工程施工中安全工作的重要性谈起,分别讨论了美国、英国、日本及我国的建筑业在施工安全管理工作中的一些情况,就建筑施工过程中的3个相关因素作了相关论述,最后提出了自己的意见和建议,特别是对我国建筑工程施工中的安全管理工作提出了比较乐观的估计.     

Cloning,expression and binding specificity analysis of odorant binding protein 3 of the lucerne plant bug, <Emphasis Type="Italic">Adelphocoris lineolatus</Emphasis> (Goeze)

Credible evidence shows that odorant binding proteins (OBPs) are required for insect olfaction perception and play a key role in transporting hydrophobic odorants across the sensillum lymph to the olfactory receptors (ORs). In the present study, a novel OBP (AlinOBP3) gene from the lucerne plant bug, Adelphocoris lineolatus, was cloned and expressed. The expression pattern of AlinOBP3 was evaluated by qPCR, which indicated that AlinOBP3 was dominantly expressed in antennae. The binding properties of AlinOBP3 with 9 cotton volatiles and 5 sex pheromone analogs were measured by fluorescence competitive binding assays with the fluorescence probe 1-NPN. The results revealed that of 9 cotton volatiles, Myrcene, β-Ocimene and α-Phellandrene can bind with AlinOBP3. α-Phellandrene especially bound to AlinOBP3 with a high binding affinity, with a dissociation constant of 56.68 μmol/L. Of the 5 sex pheromone analogs, Hexyl butyrate had the strongest binding affinity with AlinOBP3, with a dissociation constant as 59.53 μmol/L. Butyl butyrate, trans-2-Hexenyl butyrate and Ethyl butyrate had medium binding affinities with AlinOBP3, with dissociation constants of 227.39, 108.77 and 143.47 μmol/L, respectively. The results suggest that AlinOBP3 might be a pheromone binding protein (PBP) with a dual-function for the perception of sex pheromones and plant volatiles.     

关于线性NDDE振动性的代数判据Ⅱ

本文为［２］的继续，给出双滞量线性ＮＤＤＥ，当Ｐ（σ－τ）＜０时一切解振动的充要条件。     

模拟草地内黑麦草叶游离脯氨酸含量与叶含水量、土壤含水量之间的相互关系研究

实验植物黑麦草种植于自行设计和制作的圆形土壤柱中作为模拟草地，柱内土壤含水量采用称重法加以控制，通过调节灌水次数和每次灌入水量在各柱之间建立起土壤水分梯度。从柱内植物形成稳定的种群开始到生长季末，共进行了两个周期的之分处理实验，期间以固定的间隔在草群内取最新完全展开的叶片测定其含水量和游离脯氨酸含量。将每一次取样得到的脯氨酸含量、土壤含水量和叶片含水量这三组数据作相关与回归分析发现，脯氨酸含量与土     

济南城市贫困人口特征及空间差异研究

作为中国东部沿海经济大省--山东省省会,济南在城市化快速发展的进程中,城市贫困问题日益凸显.如何有效地减少城市贫困人口,已经成为现阶段政府科学发展及构建和谐社会迫在眉睫的重要任务.笔者着重对济南城市贫困人口的规模、结构特征以及空间分布差异等方面进行研究,分析空间差异的形成原因,并提出若干解困对策与建议.     

电厂余热利用的分析与探讨

文章通过分析国内外大型火电厂水冷机组循环水的余热利用情况,提出由水源热泵提高温度后的循环水为农业日光大棚供热.目前,由于在冬季北方日光大棚的农业生产效益受到环境气候条件的限制,其生产效率比较低,影响了市场的农产品供应.通过这种方式,既能减少对供热系统的投资,又可以减少供热系统的热量损失.     

将酱油中苯甲酸钠含量的测定设计为GC—MS联用教学实验的探讨

将酱油样品中苯甲酸钠的定量测定设计为本科生或研究生的气相色谱-质谱（GC—MS）联用技术的教学实验，以帮助学生充分掌握GC—MS联用仪强大的定性及定量功能。