Polaron in Bose-Einstein-Condensation System

We consider the motion of an impurity in a Bose-Einstein condensate system at T = 0 K with the contact interaztions for boson-boson and boson-impurity. Under the forward-scattering approximation, we obtain a Fr6hlich-like Hamiltonian for this system, which means that a polaron can be formed. The effective mass, the phonon number and the energy to form a polaron are obtained. We also discuss the validity of the forwardscattering approximation for this system.     

静态冷凝水试验方法及评价指标概述

静态冷凝水试验是评定涂层耐湿性能的重要方法,确定涂层在潮湿环境下的性能及腐蚀防护的缺陷;介绍了静态冷凝水试验方法及测试过程中应当注意的问题;起泡和生锈是涂层进行静态冷凝水气候测试后最常见的缺陷,详细描述了常用评价标准ISO4628-2、ASTM D714、ASTM D610对起泡和生锈的评级指标及差异。     

Finite Size Effect on the in-Medium Chiral Condensate at Finite Density

The in-medium quark condensate is studied with an equivalent quark mass approach that has the advantage of no need for extra assumptions on the current mass derivatives of model parameters with respect to the quark current mass. It is found that the ratio of the quark condensate in a medium to that in a vacuum depends not only on density but also on the finite size. With decreasing volume, it decreases to a minimum, and then saturates at a radius of about 1 fro. The condensate approaches to its bulk value when the volume becomes infinitely large, and it decreases finearly with increasing density if the density is extremely low.     

冷凝水在家用空调中回收利用技术的研究进展

随着空调在生活中的广泛使用,产生的冷凝水随意排放也引起众多问题,回收空调冷凝水已是必然。本文立足于空调冷凝水的产生原理,介绍了冷凝水在家用空调中回收利用的研究现状,并对各种回收利用技术进行了比较,指出冷凝水在家用空调中回收利用所存在的问题,为冷凝水在家用空调中高效回收利用提出了相应的方案,达到节能环保的目的。     

带有冷凝水回收利用装置的家用空调性能试验研究

针对家用空调冷凝水随意排放的现状,设计了一种冷凝水回收利用装置,并将其用于家用空调系统中进行了试验研究。试验表明:在最小运行制冷、额定制冷和最大运行制冷工况下,带有冷凝水利用装置的空调性能与空调原型机的性能相比,输入功率分别降低2.31W、0.67W、8.68W;制冷量分别增加2W、29W、20W;系统的COP分别提升0.47%、0.94%、1.20%。在下一步的试验中,通过增大冷凝水与铜管和翅片的接触面积,进一步提高系统的性能。     

Analytic Method to Study Influence of Finite Chemical Potential in QED3

Adopting the approximation to the first order of chemical potential μ, we resolve rigidly the influence on fermion condensate from μ in QED3. We show that this condensate does not respond linear expression to μ. Moreover, the influence on fermion chiral condensate from chemieal potential is investigated.     

Adiabatic Fidelity of Coherent Atom-Heteronuclear Molecule Conversion

We study the adiabatic dark-state evolutions in coherent creations of heteronuclear diatomic or triatomic molecules from an ultracold two-species atomic condensate. We find that, for different nonlinear systems, the relations between the adiabatic fidelities and the adiabatic parameters are in a universal power law but with quite different parameters.     

不同工质房间空调器的冷凝水应用对能效比的影响

本文在对比分析风冷和蒸发式冷却方式的优缺点后,从房间空调器冷凝水应用这个角度,分析正在使用的和将来可能替代使用的五种不同工质:R22、R32、R410A、R134a、R290,其应用冷凝水对能效比的影响。经理论计算比较,房间空调器应用冷凝水能效比提高,最大达17.81%,为工质R410A;最小为12.87%,为工质R32;能效比平均提高15%,节能效果比较明显。因此冷凝水利用技术对工质为R410A的房间空调器更值得推广。     

空调冷凝水净化直饮水装置的研制

分析了空调冷凝水产生、特点,对空调冷凝水水量进行了计算,详细介绍了空调冷凝水净化处理的工艺过程,研制出了空调冷凝水净化直饮水装置。经初步化验,该装置处理的空调冷凝水符合国家纯净水标准。