Estimating clear-sky land surface longwave upwelling radiation from MODIS data using a hybrid method

Surface longwave upwelling radiation (LWUP) is one of the four components for calculating the earth’s surface radiation budget. Under the general framework of the hybrid method, we developed linear models for estimating the global 1-km instantaneous clear-sky LWUP from the top-of-atmosphere (TOA) radiance of the Moderate Resolution Imaging Spectroradiometer (MODIS) thermal infrared channels 29, 31, and 32. Extensive radiative transfer simulations were conducted to produce a large number of representative samples, from which the linear model was derived. The derived hybrid model was first evaluated using ground measurements collected at 15 sites from two networks (SURFRAD and ASRCOP). According to the validation results, the average bias and root mean square error (RMSE) of ?0.55 and 15.76 W m^?2, respectively, were obtained by averaging the mean bias and RMSE for the two networks. Compared to a hybrid method developed by a previous study and the temperature-emissivity method, our linear model had a superior performance.     

The simulation and visual test contact process of a MEMS inertial switch with flexible electrodes

A MEMS inertial switch with flexible electrodes to contact-enhanced is designed and fabricated. ANSYS software is used to simulate the displacement of the mass, deformation of the flexible electrode and contact time of the switch. A high-speed video measurement has been used to visualize the switch contact process instead of electrical measurement for a deeper understanding of the dynamic contact process, and these images are used to visually validate simulation results. Comparisons between the simulation and image results are discussed. The image results are seen to be in good agreement with the dynamics simulation results.     

COS和H_2S毒化F-T合成催化剂热力学分析

利用热力学基础数据和相关软件对F-T合成催化剂COS和H_2S中毒的热力学进行了计算。在热力学上,Ru、Fe、Co的COS中毒在F-T合成反应可以发生的条件下均是自发过程。F-T合成反应体系中10~(-9)级的COS即可使Ru基催化剂中的金属Ru生成RuS_2而中毒。Fe和Co毒化后生成的硫化物种类较多,对这些反应的热力学计算结果表明,对于不同的反应,其平衡常数的差异很大,对应中毒反应发生时,所需的COS和H_2S的浓度也不同,对COS的要求更为严格。由于Fe基F-T合成催化剂活性相的复杂性,利用对催化剂相关性质的修饰开发具有一定抗硫性的铁基F-T合成催化剂是可行的;对于Co催化剂,利用F-T合成的反应特点和催化剂改性开发具有一定抗硫性催化剂是可能的。     

基于二总线结构的监测系统设计

介绍了二总线通信基本原理,并给出了基于二总线结构的监测系统的构成。该监测系统已在军事领域中得到应用。     

火力发电机组计算机监控系统高可靠性的设计

介绍了火力发电机组计算机监控系统的网络结构、软硬件设计思想及其具体实现方法。     

Automatic cage generation by improved OBBs for mesh deformation

In cage-based deformation, the most tedious task is to construct the coarse cage bounding a model. Currently, the coarse cage is constructed mainly by hand, and the construction usually takes several hours, even longer. Therefore, it is important to develop a convenient method to generate the coarse cage bounding a model. In this paper, we devise a method to construct the coarse cage automatically using the improved OBB tree, while allowing the users to modify the cage easily. Firstly, the OBB tree bounding the model is generated, where we propose an improved OBB slicing rule to make the generated OBBs close to the model it contains. Secondly, the OBBs are adjusted and merged into a whole entity by the boolean union operation. Finally, the outer surface of the entity is extracted as the coarse cage. Empirical results demonstrate the effectiveness and efficiency of the automatic coarse cage-generation method.     

Operation speed limited by the electric properties of?the?photorefractive spatial light modulator

With excellent photo-electric and electro-optical effects, the photorefractive spatial light modulators can work as optically addressed modulators in optical information processing systems and parallel optical computing systems. The photo-induced current pulses of the photorefractive spatial light modulator observed in the experiments are analyzed to conclude the characteristics, and to find the relationship between the properties of the current pulse and the structural parameters. Furthermore, the origin of the photo-induced current pulse is analyzed, and the methods to improve the operation speed of the spatial light modulators are proposed. The research results will be significant for extending the applications of the photorefractive spatial light modulators, and pushing ahead the research of all-optical modulation materials and devices for optical supercomputing.     

基于嵌入式系统开发平台的设计与实现

本文首先介绍了EVB2107评估板、评估板的系统开发工具和集成开发环境,然后对扩展板上各模块都从原理入手结合该模块要实现的功能说明其设计思想和实现原理,并就各模块驱动程序的编程思想及流程进行了论述。     

校园网病毒的入侵途径和防毒策略

本文从校园网病毒的入侵途径入手,对校园网的安全管理发表见解,重点对网络病毒的防御策略进行了介绍,给读者提供了一些有参考价值的策略,以保障校园网的安全运行。     

秦沈客运专线路堑段基床结构动态测试分析

通过对我国第一条铁路客运专线———秦沈客运专线路堑段基床表层的动态测试,得到了厚度分别为40cm与60cm的基床表层在不同车速下的动应力与加速度值,分析了它们在基床表层横向与深度方向的分布规律及其与速度的关系。