三峡工程初期蓄水回水变动区涪陵河段泥沙模型试验研究

三峡工程初期蓄水运用阶段，涪陵河段处于回水变动区，该河段较之重庆河段，受水库壅水影响早，水位抬升高，泥沙淤积对航运设施的影响早。通过全沙模型试验研究，揭示了该河段的水流泥沙运动特性和河床冲淤规律，及其对船舶安全航行和靠泊的影响。     

Rapid Analysis of Bitertanol in Agro-products Using Molecularly Imprinted Polymers-Surface-Enhanced Raman Spectroscopy

In this work, we first reported molecularly imprinted polymers-surface-enhanced Raman spectroscopy (MIP-SERS) for rapid detection and quantification of bitertanol in cucumber and peaches. In order to remove interference-mitigation effects and avoid template leakage, MIPs were successfully synthesized based on triadimefon molecules as the dummy template, methacrylic acid (MAA) as a functional monomer, trimethylolpropane trimethacrylate (TRIM) as a cross-linker, and 2,2-azobis-isobutyronitrile (AIBN) as an initiator. Static adsorption experiments and Scatchard analysis were then conducted and results showed that the synthesized MIPs could rapidly and selectively adsorb and separate bitertanol from cucumber and peaches due to their predetermined recognition sites. The capacity of MIPs for absorbing bitertanol (～ 2.21 mg/g) was approximately 1.5 times that of non-imprinted polymers (NIPs) (～ 1.55 mg/g). Gold nanoparticles (AuNPs) synthesized by sodium citrate reduction method were validated as a suitable SERS colloid for enhancing Raman signals. SERS spectral peaks (760, 985, 1190, and 1279 cm^?1) were used to develop quantitative analysis based on partial least-squares regression (PLSR) for bitertanol in cucumber and peaches. The LODs for this method were 0.041 and 0.029 mg/kg in cucumber and peaches, respectively. The entire analysis process required 15 min or less. More importantly, the MIP-SERS system provided not only a rapid, sensitive, and reliable method for bitertanol detection, but also a routine for overcoming the interference-mitigation effects in the SERS technology.     

钛合金亚β锻造与热处理组织与性能的研究

钛合金经不同锻造—热处理规范加工后,其显微组织的变化是比较复杂的,尤其是亚β锻造以后研获得的网篮组织的形态是多种多样的。本文研究的是TC6、TC11钛合金加热到高于β相变点及接近β相变温度开始进行的变形及在(α β)两相区终锻并经等温退火后,其显微组织的特殊变化,同时比较分析不同热处理后的组织一性能关系,为在生产实践中制订热加工工艺规范提供可靠的依据,以便充分挖掘钛合金性能方面的潜力。     

直流数字电压表低量限检定线路的改进及测量不确定度评定

本文详细地叙述了利用YJV—1直流标准电压源作为信号源采用比较法检定直流数字电压表低量值时所存在的问题,并设计一种改进电路,同时按照JJF1059-1999《测量不确定度评定与表示》规范的要求,对上述方法中所阐述的直流数字电压表低量值部分示值误差测量结果的不确定度进行了评定。     

OMNET的安装与版本间区别

随着信息技术的进步与发展,无线传感器网络(WSN)在无线通信技术中占有着举足轻重的地位,在诸如环境监测、医疗护理、军事领域有着广泛的应用,其综合了传感器技术、无线通信技术等技术,是当前国际上备受关注的前沿热点研究领域.本文主要研究现阶段经典的路由算法,并对其进行了仿真实现,时LEACH算法进行了改进,降低无线传感器网络节点能耗,延长无线传感器网络节点的寿命,提高整个网络的工作效率.     

钢样传送、分析及其与信息系统的集成

利用风动这样系统,辅以计算机及网络技术,把钢样的传送、分析与信息系统有效地集成在一起,达到了快速送样、分析、报出成分的目的,满足炼钢生产的需要。     

饮酒后人体血液中酒精含量变化规律的数学模型

本主要讨论饮酒后酒精含量在人体血液中的变化规律。根据已知的一组数据，利用MATLAB软件，采用分段非线性拟合的方法，得到酒精含量变化规律的数学模型。本得到的数学模型与已知数据的拟合效果好。以此为基本模型，推出了在几种不同的饮酒方式下，产生的相应的酒精含量变化规律的数学模型。并且根据我们的模型，通过图象及其数据分析，首先对某个司机碰到的违章情况给予了解释；其次对司机喝了3瓶啤酒后多长时间内驾车会违章给出了回答；第三估计了血液中酒精含量在什么时候最高；第四对司机天天喝酒。是否还能开车，进行初步分析。     

Non-fragile delay-dependent H ∞ control of linear time-delay system with uncertainties in state and control input

The problem of designing a non-fragile delay-dependent H∞ state-feedback controller was investigated for a linear time-delay system with uncertainties in state and control input. First, a recently derived integral inequality method and Lyapunov-Krasovskii stability theory were used to derive new delay-dependent bounded real lemmas for a non-fragile state-feedback controller containing additive or multiplicative uncertainties. They ensure that the closed-loop system is internally stable and has a given H∞ disturbance attenuation level. Then, methods of designing a non-fragile H∞ state feedback controller were presented. No parameters need to be tuned and can be easily determined by solving linear matrix inequalities. Finally, the validity of the proposed methods was demonstrated by a numerical example with the asymptotically stable curves of system state and controller output under the initial condition of x（0）=[1 0 -1]^T and h=0.8 time-delay boundary.