高速公路沿线植物声屏障设计与应用研究

对高速公路交通噪声特性和治污降噪机理进行分析,阐述了利用植物声屏障降低高速公路沿线交通噪声的可行性和优越性,介绍了植物声屏障的设计模型与设计方法,以及植物选择原则及范围。在此基础上,以云南楚大高速公路K37＋100～K37＋250段为例,对植物声屏障设计应用进行实例研究,分析了试验项目概况、设计方案,并提出了其中的注意事项,结合大量统计资料分析和云南楚大高速公路植物降噪试验项目的研究,以期为类似工程项目的实施提供参考。     

约束集值优化问题的高阶Wolfe型对偶

利用集值映射的广义高阶邻接上图导数,构建了约束集值优化问题的一类高阶Wolfe型对偶,并建立了相应的弱对偶、强对偶和逆对偶定理.     

我国观光农业发展的探讨

介绍了国内外观光农业的发展情况,分析了我国观光农业发展存在的主要问题,提出了发展我国观光农业的建议。     

传感器网络同步态的节点故障诊断算法

首先介绍了复杂网络同步态的概念,以传感器量测数据为节点,定义了随时间动态变化的传感器网络,采用数学分析方法定量描述了传感器网络的动力学机制,给出了传感器网络同步态的数学定义、计算方法及其实际的物理含义。理论推导表明,同步态从全局角度评价传感器网络的健康程度,以量测数据距离关联性定义复杂网络的耦合矩阵A=（a_ij）_N×N,并以该耦合矩阵零特征值对应的左特征向量（ξ₁,ξ₂,...,ξ_N）来刻画传感器网络节点的局部细节信息,进而衍生出基于传感器网络同步态的节点故障诊断算法,实现传感器网络的故障诊断。实验仿真了由100个传感器组成的复杂网络,采集了在稳定运动60 s期间的的量测数据,每个量测数据长度为5 000,其中有3个传感器处于间歇增益故障状态,以此来验证基于传感器网络同步态的节点故障诊断算法的有效性。结果表明,该算法不仅可以很好地跟踪整个传感器网络的工作状态,实时监测每个传感器网络节点的故障,而且可以利用传感器网络节点故障之间的相关性有效地识别出传感器量测数据的异常是由外界量测对象的改变还是由传感器本身故障引起的。该算法为全局评估传感器网络的工作状态和监测网络节点的局部故障提供了一个新颖可行的研究思路,期望为相关领域的研究学者提供有益的参考。     

Experimental Analysis of Deformation Characteristic for Soil Bank Slope Under Reservoir Water Level Fluctuation

Under reservoir water level fluctuation, soil bank slope water sucking, stress concentration and slip deformation in Three Gorges Reservoir area form slope cracks system at different periods and different spatial parts. In this study, laws of cracks spatial evolution in different deformation periods for soil bank slope were analyzed during a water cycle of impoundment and decline by model test. The test results indicated that, in the initial impoundment period, cracks appeared near the water line at the bank slope leading edge with high appearance frequency, and scale increased gradually and partial bank slope collapsed and damaged. In the middle impoundment period, cracks appeared in the front and trailing edges of bank slope, the frequency of occurrence and the scale of which decreased. And in the late impoundment period, the leading edge of the cracks development disappeared, the trailing edge of the cracks continued to develop and the bank slope crept along the sliding surface as a whole. Cracks expanded slowly in the pause impoundment as the water level raised. In the water level decline stage, tensile cracks mainly occurred in the back edges of bank slope. In the early water level decline, cracks appeared in low frequency and it grew slowly. In the late water level decline, cracks appeared in high frequency and large scale, and where the bank slope produced lower seat deformation and dislocated berm. Moreover, in water level decline stage, bank slope crept along the sliding surface as a whole.     

Safety Evaluation of High cutting Slope along Highway in Mountainous Area

Slope safety stability is the bottleneck problem for the development of mountainous highway, especially high class highway in China, which results from greatness slopes along highway in mountainous area, complex geological environment and short forming age. The important degree arrangement of various indexes was carried out based on simple dependent function. And weighting system of indexes was modified with analytic hierarchy process and expert reliability. With indexes and weighting system, matter element extension model for high cutting slope along highway in mountainous area was proposed by matter element extension method. A case study was undertaken for K88+680 high cutting slopes along Wushan Wuxi road in Chongqing city based on the model. It was indicated that the safety grade is Ⅲ and the slope is instable.     

Anti sliding pile performance under acid stress coupling

Anti sliding piles are an important engineering structure used extensively in landslide prevention. Their durability influences their work lives. In a laboratory model experiment of a cantilevered anti sliding pile under acid stress coupling, the pile body displacement variation is monitored continuously, and both concrete strength and neutralization depth are tested. The results indicate that the concrete strength decreases gradually under acid stress coupling, while the displacement increases continuously. The neutralization depth of the concrete in the anti sliding pile is linear to the square of duration in acid stress coupling.     

Methods of Rock Crack Density Determination and Their Application

By the methods of micro damage theory, the relations of rock mass parameters and rock parameters in experiments were obtained; it is considered that to make the micro damage theory for determining the rock parameters possible only in condition that the crack density parameters are obtained reasonably. The methods to determine rock mass crack density have been set up through the intactness index of rock mass and elastic wave equation as well as the geological investigating statistical method, The differences of rock crack density given by these three methods were discussed; based on the statistical data, the Taylor method and generalized self consistent method and the Taylor medium method were compared in respect of the influence of crack interaction and the adaptability to the rock parameters . The results show that the reasonable results can be obtained by determining rock crack density from intactness index of rock mass and rock mass parameters by the Taylor medium method.     

Properties of Steel Fiber Asphalt Concrete and Its Application

To prevent asphalt pavement from cracking under low temperatures and prolong its fatigue life, we tested the properties of a new type of steel fiber asphalt pavement. The tests evaluated Marshall stability, dynamic ruts, and cleavage strength under both low and normal temperature conditions. We also analyzed the anti-corrosion property of steel fiber and the factors affecting the properties of the steel fiber asphalt mixture. The steel fiber asphalt pavement was installed on a highway in Chongqing, P. R. China to investigate the construction art of the steel fiber asphalt mixture and examine its effect in field use. The test results and concrete use in the field show that the cleavage strength and flexibility of steel fiber asphalt concrete increase due to the action of steel fiber. We conclude that the anti-cracking capacity of asphalt pavement under low temperature conditions can be improved by steel fiber. The construction art of steel fiber asphalt pavement is the same as common asphalt pavement without the necessity of anti-corrosion processing for steel fiber. The research results are useful for pavement material selection in low temperature regions and heavy traffic road pavement designs.     

A method to generate pseudorandom phases in transform domain communication system by chaos mapping

The traditional method of generating pseudorandom phase vector through a linear feedback shift register (LFSR) and a pre set combination of taps in transform domain communication system(TDCS) was studied. Based on the requirements of the pseudorandom phase vector in TDCS, a new method using chaos mapping to generate the pseudorandom phases in TDCS was proposed. This method generated binary quantization chaotic sequences by using chaos mapping with different initial values, and then creates a pseudorandom phase vector by using a phase mapper. Finally, the basis function was obtained. The implementation method of chaos mapping and the simulation results regarding the correlation performance for the basis function were discussed in detail. Compared with the basis functions generated by LFSR, the basis functions generated by chaos mapping have better correlation performance. Because many basis functions with small cross correlation coefficients can be generated by chaos mapping, this method is advantageous for multiple access applications.