孤立子—一种非线性效应

本文较为系统地介绍了非线性效应孤立子的发现历史和研究发展过程;较详细地讨论了几种典型孤子方程及其对应孤子解的数学形式与物理意义;同时还简要地介绍了孤子的研究现状和实际应用。     

Photon-Assisted Electron Transport for a λ-shaped Carbon Nanotube Junction

We theoretically study the electron transport properties for two coupled single-walled caxbon nanotube quantum dots connected to metallic electrodes under the irradiation of an external electromagnetic field at low tempera- tures. Using the standaxd nonequilibrium Green＇s function techniques, we examine the time-averaged transmission coefficient and linear conductance. It is shown that by some numerical examples, the photon-assisted inter-dot coupling causes Fano resonance and the conductance of the system is sensitive to the external field parameters. The transport dependence on the external field parameters may be used to detect the high-frequency microwave irradiation.     

非线性互补问题的两种数值解法

本文研究了非线性互补问题的两类数值求解方法.在经典LQP算法及LevenbergMarquardt算法的基础上,构造了两种新算法,并证明了这两种新算法的收敛性.数值实验表明,新算法对测试问题优于已有算法.     

Alternating-Current Conductivity for a Two-Channel Interacting Quantum Wire

We investigate theoretically the ac conductivity of a dean two-channel spinless quantum wire in the presence of both short-ranged intra- and inter-channel electron-electron interactions. In the Luttinger-liquid regime, we formulize the action functional of the system with an external time-varying electric field. The obtained expression of ac conductivity for the system within linear response theory is generally an oscillation function of the interaction strength, the driving frequency as well as the measured position in the wire. The numerical examples demonstrate that the amplitude of ac conductivity is renormalized by the both interactions, and the dc conductivity of the system with inter-channel interaction is smaller than that without inter-channel interaction.     

中央空调末端设备温度控制与分户计量系统研究

根据现代智能大厦物业管理的实际要求,对中央空调末端设备温度控制与分户计量系统进行研究,重点阐述了一种基于PIC单片微控制器为控制核心,应用电力线载波通信技术的空调冷量计费管理系统,详细介绍了该系统硬件及软件设计方案和关键技术。     

地源热泵的应用对环境的影响分析

地源热泵被认为是一种高效、节能、环保、有利于可持续发展的技术,它被认为是21世纪最有效的空调技术。然而地源热泵的大量使用也带来了一系列的环境问题。分别针对地表水源热泵、地下水源热泵以及土壤源热泵的使用对环境的影响进行了深入分析,并对可能的解决方案进行了讨论。     

无反射势的Schrdinger方程严格解的三维推广

文献[1]给出无反射势V(x)=-N(N+1)sech~2x当N为任意正整数时schrodinger方程束缚态和散射态的严格解。本文推广文献[1]的工作,继续给出三维情况下无反射势Schrodinger方程束缚态和散射态的严格解,并得到了与一维情况不同的一些物理结果。     

低压补气新型冷藏系统的实验研究

针对冷藏机组存在冷藏设备落后、系统运行不稳定、排气温度过高导致停机等问题,开发了一套库内外采用平行流换热器且基于准双级压缩理论的低压补气的新型冷藏系统,并研究了过热度、低压补气对冷藏系统制冷性能的影响.结果表明:正常冷藏工况下,主阀过热度为5 K、补阀过热度为30 K时,冷藏系统运行稳定、匹配性优、节能性好.库内温度由...     

变风量客车空调系统性能实验研究

针对纯电动客车热泵空调系统制冷与制热性能衰减严重、耗能较高等问题,设计并搭建了一款基于R410A纯电动客车热泵空调系统实验台.该实验研究了变车外风机风量对热泵系统性能的影响.实验结果表明:低压补气制冷工况下:车内风量为100％,车外风量从40％增加到100％时,系统制冷量增加1.45％,COP1上升12.7％,COP2...