基于离群点分析的分布式光伏发电量异常检测算法

针对分布式光伏有带病运行以及骗取国家补贴的现象,本文基于离群点分析中的格拉布斯准则和分布式光伏的自身特点,提出了一种分布式光伏发电量异常检测算法。该算法可以筛选出单位容量日发电量过高与过低的分布式光伏用户,进而可以避免分布式光伏长期带病运行,以及遏制骗取国家补贴的行为。最后以某县的分布式光伏数据进行了算例分析,验证了该算法的有效性。     

High Manganese Steel Alloying Process and Its Influence on Microstructure and Properties of the Steel

The influence of two kinds of alloying processes, adding Nb (or Ti) and N-Mn alloy as well as adding Nb (or Ti) and spraying N2, on microstructures and properties of a high manganese steel has been studied. It has been found that adding Nb(or Ti), accompanying with N-Mn alloy, is unfavourable to microstructure compactness of the high manganese steel, but adding Nb (or Ti)and spraying N2 into the melt is good for refining austenitic grain, forming a lot of hard particles and improving microstructure compactness. The mechanical properties of the high manganese steel have relation to the content of elements Nb or Ti. Its fracture mode will turn ductile fracture into brittle cleavage fracture gradually. By X-ray and TEM analysis, it is proved that the austenite can be transformed to deformation-induced α martensite after adding a certain amount of element Nb (or Ti). The microstructure transformation of alloying high manganese steels through deformation is one of methods for strengthening austenite matrix and increasing the work-hardening rate as well as improving antiwear property.     

PDHA：一种移动Agent保护协议研究

针对移动Agent本身的安全性问题，提出了一种基于软件防护的移动Agent保护协议—PDHA（a protocol to detect malicious hosts’attacks），并对该协议进行了安全性分析和性能分析。该协议的核心思想是通过关联密钥链加密机制对移动Agent的数据进行加密，并应用参考状态分析机制对移动Agent的代码、状态进行保护，从而形成一种全面的移动Agent保护协议。实验表明，PDHA协议功能是可以达到的，安全性也更强。     

I~2C总线技术在智能电表系统中的应用

智能电表系统中数据的有效存储和管理一直是系统设计的重点和难点,介绍了TMS320F240的DSP系统基本结构、I2C技术和非易失性存储器AT24LC256,对AT24LC256的存储空间进行合理的划分,确保了存储空间高效利用和管理;利用TMS320LF2407的I/O口实现了其与AT24LC256接口的虚拟I2C软件设计,并完成了智能电表系统中重要数据的保存。     

Knowledge Engineering Application in maintainability Design and Analysis

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高截止频率异质结双极晶体管的研制

本文介绍了研制异质结双极晶体管(HBT)的工艺过程。使用MOCVD生长的GaAlAs/GaAs多层结构外延材料,采用离子注入隔离和湿法腐蚀技术,实现基极与发射极台面自对准工艺,研制出截止频率为22GHz的HBT。     

放射性核素在地下水中的迁移

本文叙述了放射性核素~(137)Cs、~(90)Sr-~(90)Y和~(144)Ce-~(144)Pr在地下水和岩石间的分配系数K_d的实验室测定方法,研究了放射性核素浓度、岩石种类及岩石粒度对K_d值的影响。测定了这三种核素模拟在三万吨TNT地下核爆炸空腔充满水时的浓度下的分配系数K_d值,计算了它们在地下水中的迁移速率。     

Non-isothermal decomposition kinetics and lifetime of Tb2(0-MBA)6(PHEN)2

The thermal decomposition of Tb2(O-MBA)6(PHEN)2 (O-MBA: o-methylbenzoate; PHEN: 1,10-phenanthroline) and its kinetics were studied under the non-isothermal condition by thermogravimetry-derivative thermogravimetry (TG-DTG) techniques. Kinetic parameters were obtained from analysis of TG-DTG curves by the Achar method and the Madhusudanan-Krishnan-Ninan (MKN) method. The most probable mechanism function was suggested by comparing the kinetic parameters. The kinetic equation for the first stage can be expressed as dcddt = Aexp(-E/RT) 3(1 - α)2/3 The lifetime equation at mass loss of 10% was deduced as lnr= -28.7429 + 19797.795/Tby isothermal thermogravimetric analysis.     

Research on dynamics of a class of heavy vehicle-tire-road coupling system

The dynamic tire force of heavy vehicle is a primary reason for road damage. This paper presents a mathematic model to restore the interacting process of vehicle-tire-road system and tries to find out the mechanics of interaction. A nonlinear tri-axle vehicle model with IBS (integral balanced suspension) is firstly proposed based on the detailed analysis of structural features of a heavy vehicle (DFL1250). The results indicate that the nonlinearities in the vehicle suspension contribute to improvement of ri...     

EFFECT OF P ON IMPACT TOUGHNESS OF Cr-Mn-Si STEEL

用系列冲击试验法研究了30CrMnsiA钢在常规热处理工艺条件下,不同磷含量与冲击韧性的关系.试验结果表明,当磷含量≥0.012wt-%时,随磷含量的增加,冲击韧性明显下降.扫描电镜和Auger能谱分析发现,随磷含量增加,沿晶断裂面积及晶界上磷偏析增加.回火后缓慢冷却促进磷向晶界偏析,并使低温冲击韧性显著下降.550℃为本实验钢的高温回火脆性温度.