被动微波土壤水分反演中消除植被影响的方法研究

针对被动微波反演土壤水分中,ω-τ模型忽略植被内部多次散射的局限,将光线跟踪原理的双矩阵(Matrix Doubling)算法应用到植被覆盖地区的地表辐射以及植被与地表之间多次散射问题.这种方法可以有效地弥补ω-τ模型的缺陷,但需要的参数较多且形式复杂,很难被直接应用到模拟计算和土壤水分反演中.针对这些问题,本文将基于双矩阵(Matrix Doubling)的算法进行简化,分别考虑植被内仅存在一次散射、两次散射、三次散射以及多次散射的情况.将散射矩阵和传输矩阵表达式简化,利用野外楸树林实验得到的植被参数进行模拟.结果显示当仅考虑两次散射时模拟结果与原始模型的差别已经很小.     

基于板卡的视频监控系统的设计与实现

在Windows平台下采用VisualC＋＋设计和实现了一个视频监控系统。本文详细介绍了系统开发的步骤,提供了主要功能模块实现的关键代码,该系统人机界面友好,可靠性高,而且便于开发升级。     

Algorithms to Minimize Data Transfer for Code Update on Wireless Sensor Network

In Wireless Sensor Networks, the preloaded program code and data on sensor nodes often need to be updated due to changes in user requirements and environmental conditions. Sensor nodes are severely restricted by energy constraints. It is especially energy consuming for sensor nodes to transfer data through wireless radios. To efficiently reprogram sensor nodes through radio, we propose an algorithm, Minimum Data transferred by Copying and Downloading (MDCD) and its extension E-MDCD, to minimize the number of bytes needed to be transferred from the host machine to the sensor nodes. Experimental results show that the E-MDCD algorithm reduces the number of bytes transferred by 93.25 % for small code change compared with the Rsync based algorithm. In average, E-MDCD can reduce 59.82 % compared with the existing the Rsync based algorithm and 16.14 % compared with the Vdelta algorithm.     

Energy-efficient power allocation for non-regenerative OFDM relay links

We consider a two-hop non-regenerative (amplify-and-forward) relay link with one source, one destination and one relay, in which orthogonal frequency division multiplexing (OFDM) is used. The power allocation (PA) to maximize the energy efficiency for the whole link is investigated under quality of service (Qos) require- ment and separate power constraints. An approximation method with low complexity is first proposed to convert the PA problem into a quasi-concave problem, which can obtain a tight lower bound in high SNR region. Furthermore, a more accurate approximation method with higher complexity is raised, which can approach the actual performance both in the low SNR and high SNR regions. We also introduce subcarrier pairing scheme to further enhance the energy efficiency for the link. Simulation results are shown to compare the performance of the two proposed methods.     

大通县城路灯改造浅析

文章从大通县县路灯的现状出发，对路灯改造中迫切需要解决的问题进行了分析和探讨，对大通县城市基础设施的建设具有一定的参考价值。同时，希望与各位同仁共同对此问题进行进一步分析和探讨。     

Successful Treatment of Liver Aspergilloma by Caspofungin Acetate First-Line Therapy in a Non-Immunocompromised Patient

Aspergillosis remains to be a life-threatening complication in immunocompromised patients. However, Aspergillus infection can be observed in non-immunocompromised individuals in rare cases. We report a case of liver aspergilloma in a chronic aplastic anemia patient under relatively intact immune status. Therapeutic strategy for this rare condition was extensively discussed and caspofungin acetate single agent first-line therapy was applied after careful consideration. Encouraging clinical and radiologic improvements were achieved in response to the antifungal salvage. Our long-term follow-up study also revealed a favorable prognosis. Based on this experience, we suggest caspofungin acetate as first-line therapy for treatment plans of liver aspergilloma.     

5-羟甲基噻唑的合成

标题化合物是合成第二代抗AIDS药物利托那韦(Ritonavir)的中间体.以2-氯-5-氯甲基噻唑为原料,经过乙醇-氢氧化钠溶液水解,锌粉/醋酸还原脱氯,氢氧化钠水解合成5-羟甲基噻唑.在适宜的条件下,5-羟甲基噻唑总收率为66.2%.     

Five Key Relationships Shall Be Well Treated in Power Reform——An interview with Dr.Yu Yanshan from SERC

The interviewee.being the deputy director of the Department of General Administration and concurrently the director of the Department of Research of the State Electricity Regulatory Commission(SERC),is in charge of the researches on supervisory policies about power industry.     

颗粒粘结高燃速推进剂药柱中溶剂迁移的研究

研究了颗粒粘结高燃速固体推进剂药柱中粘结剂与小粒药之间的溶剂双向迁移现象，并利用计算机模拟估算了溶剂迁移量的大致范围。     

政务信息资源目录体系技术概述

政务信息资源目录体系是政务信息资源开发和利用的基础设施，主要介绍了包括政务信息资源目录体系的基本概念、主要作用．关键标准。支撑技术及应用模式。