一种新的抖动调制方法

本文在脉冲延迟发生的基础上提供了一种用调相方法实现抖动调制的方案。该采用数字电路，与传统的调频方法比较具有易实现，精度高等优点，并为进一步开发出抖动测试集资打下了基础。     

Optical properties and cooling performance analyses of single-layer radiative cooling coating with mixture of TiO2 particles and SiO2 particles

Radiative cooling can achieve cooling effect without consuming any energy by delivering energy into outer space(3K) through"atmospheric window"(8–13 μm). Conventional radiative cooling coating with multi-layer structure was severely restricted during application due to its complex preparation process and high cost. In this study, a single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles was proposed. The algorithm for calculating the radiative properties of the multi-particle system was developed. Monte Carlo ray-tracing method combined with that algorithm was used to solve the radiative transfer equation(RTE) of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles.The effects of particle diameter, volume fraction and coating thickness on radiative cooling performance were analyzed to obtain the best radiative cooling performance. The numerical results indicated that the average reflectivity of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles in the solar spectrum can reach 95.6%, while and the average emissivity in the "atmospheric window" spectrum can reach 94.9% without additional silver-reflectance layer. The average reflectivity in the solar spectrum and average emissivity in the "atmospheric window" spectrum of the single-layer radiative cooling coating with mixture of TiO_2 particles and SiO_2 particles can increase 4.6% and 4.8% compared to the double-layer radiative cooling coating. This numerical research results can provide a theoretical guidance for design and optimization of single-layer radiative cooling coatings containing mixed nanoparticles.     

Construction of highly nonlinear resilient Boolean functions satisfying strict avalanche criterion

Boolean functions with high nonlinearity, high resiliency and strict avalanche criterion （SAC） play an important role in the designs of conventional cryptographic systems. In this paper, a method is proposed to construct resilient Boolean functions on n variables （n even） satisfying SAC with nonlinearity 〉 2n-1 -2n/2. A large class of cryptographic Boolean functions that were not known earlier were obtained.     

Numerical and experimental investigation on emission performance of a fuel staged combustor

The low NOx emission technology has become an important feature of advanced aviation engine.A wide range of applications attempt to take advantage of the fact that staged combustion under lean-premixed-prevaporized(LPP)conditions can significantly cut down emission and improve combustion efficiency.This paper proposes a scheme with fuel centrally staged and multi-point injection.The mixing of fuel and air is improved,and the flame temperature is relative low in combustion zone,minimizing the formation of nitrogen oxides(NOx),especially thermal NOx.In terms of the field distribution of equivalence ratio and temperature obtained from Computational Fluid Dynamics(CFD),a chemical reactor network(CRN),including several different ideal reactor,namely perfectly stirred reactor(PSR)and plug flow reactor(PFR),is constructed to simulate the combustion process and predict pollution emission.The influences of the pilot equivalence ratio and percentage of pilot/main fuel on NOx and carbon monoxide(CO)emission were investigated by CRN model.The effects of the pilot fuel and primary fuel on pollution emission were investigated experimentally.Finally,the effects of pilot equivalence ratio and pilot fuel proportion on NOx emission were discussed in detail by comparing predict of CRN and experimental results.     

Analysis of the effect of regional lateral inflow on the flood peak of the Three Gorges Reservoir

The Three Gorges Region(TGR),located at the lower reach of the Upper Yangtze River Basin(UYRB) in China,suffers from heavy rainstorm frequently.The runoff generated from TGR composes an important part of the total flood at the famous Three Gorges Reservoir(TGRe).During the severe flood period in 1954,for example,the water from TGR accounted for up to 13.2% of the 30-days maximum flood volume of the UYRB.Considering the short and steep tributaries with rapid concentration,the regional lateral inflow(RLI) may...     

导弹挂架载荷标定试验与模型求解

根据飞机导弹挂架结构分析与实际受力情况,在导弹挂架受载结构部件处粘贴应变传感器.通过地面加载标定以及试验数据分析处理,建立导弹挂架载荷输入与应变输出本构方程关系式,得到导弹挂架在实际飞行过程中的载荷-时间历程,对导弹挂架的结构设计与优化、寿命估算和地面模拟试验具有参考意义.     

Thermodynamic watershed hydrological model: Constitutive relationship

The representative elementary watershed (REW) approach proposed by Reggiani et al. was the first attempt to develop scale adaptable equations applicable directly at the macro scale. Tian et al. extended the initial definition of REW for simulating the energy related processes, and re-organized the deriving procedure of balance equations so that additional sub-regions and substances could be easily incorporated. The resultant ordinary differential equation set can simulate various hydrological processes in a physically reasonable way. However, constitutive and geometric relationships have not been developed for Tian et al.’s equation set, which are necessary for the thermodynamic watershed hydrological model to apply in hydrological modeling practice. In this work, the constitutive equations for mass exchange terms and momentum exchange terms were developed as well as geometric relationships. The closed ordinary differential equation set with nine equations was finally obtained. Supported by the National Natural Science Foundation of China (Grant No. 50509013)     

Spatial averaging infiltration model for layered soil

To quantify the influences of soil heterogeneity on infiltration, a spatial averaging infiltration model for layered soil (SAI model) is developed by coupling the spatial averaging approach proposed by Chen et al. and the Generalized Green-Ampt model proposed by Jia et al. In the SAI model, the spatial hetero- geneity along the horizontal direction is described by a probability distribution function, while that along the vertical direction is represented by the layered soils. The SAI model is tested on a ty...     

上部组块海上浮装仿真技术

分析了大型结构物海上浮装关键装置,包括桩腿耦合装置、平台支撑装置、纵荡与横荡护舷等。研究了上述关键装置的结构组成与功能、力学属性和基于MOSES软件的建模技术,重点解决了驳船、结构物(上部组块)、基础结构(导管架)、桩腿耦合装置、平台支撑装置、纵荡与横荡护舷以及驳船系泊系统的建模技术难题,最终建立了包括上述各部分的大型结构物海上浮装一体化计算机仿真环境,为进行海上浮装过程中各阶段驳船、插尖运动计算和腿耦合装置、平台支撑装置等的受力分析打下了基础。该项研究结果可以为大型结构物海上浮装的计算分析提供指导。     

一种复合材料层合板的S-N曲线模型

基于纤维增强复合材料疲劳机理和试验数据,文中给出一个描述纤维增强复合材料拉一拉疲劳的S-N曲线模型.此模型同时考虑复合材料受载方向的静抗拉强度、纤维静强度、疲劳载荷应力比等诸多因素对S-N曲线的影响,且模型中所用参数容易得到.