基于资产组合理论的发电商电能分配策略研究

如何将有限的电能在各个细分电能市场进行合理的分配从而获得利润最大化,是发电厂商当前急需解决的问题.将发电商在电能市场和备用市场的能量分配策略看成投资者对风险资产的投资组合策略,运用Markowitz的均值-方差分析理论建立了相应的分析模型,通过对模型的求解,得到了发电商的最优能量分配策略.     

PWR蒸汽发生器中一、二次汽水分离器加装挡水器研究

在水－空气实验台架上，对PWR蒸汽发生器中一次汽水分离器和一、二次水分离器加装挡水器进行了一系列实验研究，实验表明，在循环倍率不大的条件下，一、二次汽水分离器加装档水器，可降低汽水分离器的上携带，挡水器的集水效果与挡水器的轴向位置有关。     

次声波武器及其物理基础

分析了两次声波武器的工作原理，并在此基础上对其主要特征加以简要分析。概述了次声波武器的发展现状。     

微型贯流水轮发电机组

介绍了一种新型的低水头全贯流微型水轮发电机组。它不需励磁,不必调速,采用晶闸管变流技术,保证电压的频率、幅值、相位的稳定。它适合山区分散的独立用户,也可以并网运行。     

Mathematical modeling of a steam generator for sensor fault detection

A dynamic model for a nuclear power plant steam generator (vertical, preheated, U-tube recirculation-type) is formulated as a sixth-order nonlinear system. The model integrates nodal mass and energy balances for the primary water, the U-tube metal and the secondary water and steam. The downcomer flow is determined by a static balance of momentum. The mathematical system is solved using transient input data from the Philippsburg 2 (FRG) nuclear power plant. The results of the calculation are compared with actual measured values. The proposed model provides a low-cost tool for the automatic control and simulation of the steam generating process. The “parity-space” algorithm is used to demonstrate the applicability of the mathematical model for sensor fault detection and identification purposes. This technique provides a powerful means of generating temporal analytic redundancy between sensor signals. It demonstrates good detection rates of sensor errors using relatively few steps of scanning time and allows the reconfiguration of faulty signals.     

CHARACTERISTIC CONDITIONS FOR THECOMPLETE INFINITESIMAL GENERATORS OFANALYTIC SEMIGROUPS OF GROWTH ORDER α

1IntroductionandMainResultLetXbeacomPlexBanachspaceandletB(X)bethesetofaJlboundedlinearoperatorsfromXintoitselLAccordingtoDaPratol1],Sobole.skii[4]andZafievskii[6],aoneparameter~ly{T(t);t>o}CB(X)iscalledasemigroupofgrowtl1ordercr>Oif(Al)T(t s)=T(t)T(s)fort,s>oandT(t)xiscolltinuousillt>oforeachxEX;(Az)IfT(t)z=oforallt>O,thenx=o;(As)Ilt"T(t)IIisboundedast-O ;(A4)Xo=U,>.T(t)XisdenseinX.TheinfinitesimalgeneratorAoof{T(t);t>o}isdefinedbyItisknown[2]thatAoisclosable.LetA=Ao,thenA…     

Control strategy of central pattern generator gait movement under condition of attention selection

As a typical rhythmic movement, human being’s rhythmic gait movement can be generated by a central pattern generator (CPG) located in a spinal cord by self-oscillation. Some kinds of gait movements are caused by gait frequency and amplitude variances. As an important property of human being’s motion vision, the attention selection mechanism plays a vital part in the regulation of gait movement. In this paper, the CPG model is amended under the condition of attention selection on the theoretical basis of Matsuoka neural oscillators. Regulation of attention selection signal for the CPG model parameters and structure is studied, which consequentially causes the frequency and amplitude changes of gait movement output. Further, the control strategy of the CPG model gait movement under the condition of attention selection is discussed, showing that the attention selection model can regulate the output model of CPG gait movement in three different ways. The realization of regulation on the gait movement frequency and amplitude shows a variety of regulation on the CPG gait movement made by attention selection and enriches the controllability of CPG gait movement, which demonstrates potential influence in engineering applications.     

Spin and charge Nernst effect in a four-terminal double-dot interferometer

We investigate the spin and charge Nernst effect of a four-terminal Aharonov–Bohm interferometer with Rashba spin–orbit interaction (RSOI). It is shown that a pure spin Nernst effect or a fully spin-polarized Nernst effect can be obtained by modulating the magnetic flux phase ? and the RSOI induced phase φ. It is also demonstrated that some windows of ? (or φ) for maintaining an almost fully spin-polarized Nernst effect exist and their width is under the control of the other phase. Moreover, for the charge Nernst coefficient $N_c$ and spin Nernst coefficient $N_s$ the relationship $N_c(?,\phi )=?N_s(\phi ,?)$ always holds. These results suggest that our proposal may act as a controllable thermospin generator.     

化学激光器1/4环柱型增益发生器

设计并搭建了化学激光器1/4环柱型增益发生器的实验系统。按设计流量进行了出光实验,功率计探测到的出光功率在60 W左右。测量了燃烧室温度及压力,与Alpha激光器HL911-3实验数据类似,燃烧室温度及压力曲线都存在一个爬升阶段。环柱型增益发生器沿角向扩张的特点使得光腔区压力很低,仅为0.5 kPa左右。为验证环柱状增益区的有效形成,对3对取光孔分别进行了出光实验,结果表明每对取光孔都有功率输出,证明设计的增益发生器运行正常。

     

皮秒脉冲功率技术理论模型及其优化设计

为了产生100~500 ps,200~500 kV,1~10 kA数量级的皮秒放电脉冲,建立了一个皮秒脉冲发生器理论模型,并提出利用增益系数极值法,确定其最大兼容工作点,相对于纳秒脉冲成形线,皮秒脉冲成形线实现了90%,70%,85%的归一化电压增益、能量增益和放电功率增益。为了最大限度地降低皮秒脉冲成形线的载压时间,提高系统的绝缘安全因子,利用华罗庚0.618优算法,设计了电压传输系数。在纳秒脉冲成形线与皮秒脉冲成形线阻抗比值等于1.63条件下,在4倍和6倍皮秒脉冲成形线时间之内,归一化电压增益、能量增益和放电功率增益就可以分别达到94%,72%,89%与99%,53%,97%。