聚酰亚胺粘结MoS2基固体润滑涂层在油介质中的摩擦学性能

为了探讨聚酰亚胺粘结MoS2基固体润滑涂层在油介质中的摩擦学性能及其作用机理,采用MHK-500型摩擦磨损试验机对聚酰亚胺粘结MoS2基固体润滑涂层在4种油介质(RP-3煤油、SG 15W-40机油、0＃柴油和液体石蜡)中的摩擦磨损性能进行了评价,并对其机理进行了初步的探讨.结果表明：与干摩擦相比,涂层在此4种油介质中的摩擦学性能均得到显著提高,其中涂层在柴油介质中的抗磨性能的提高最为突出;同种油介质中,涂层在高速(2.56 m/s)、低载(1 120 N)下的耐磨性明显优于低速(1.54 m/s)、高载(2 120 N)下的耐磨性;在低速(1.54 m/s)、高载(2 120 N)下的煤油介质中,涂层表面的物理状态在摩擦过程中的变化最终导致涂层摩擦系数的起伏和较大的磨损率.     

A Security Proof of Measurement Device Independent Quantum Key Distribution： From the View of Information Theory

Although some ideal quantum key distribution protocols have been proved to be secure, there have been some demonstrations that practical quantum key distribution implementations were hacked due to some real-life imperfections. Among these attacks, detector side channel attacks may be the most serious. Recently, a measurement device independent quantum key distribution protocol [Phys. Rev. Lett. 108 （2012） 130503] was proposed and all detector side channel attacks are removed in this scheme. Here a new security proof based on quantum information theory is given. The eavesdropper＇s information of the sifted key bits is bounded. Then with this bound, the final secure key bit rate can be obtained.     

Effects of shape and dopant on structural,optical absorption,Raman, and vibrational properties of silver and copper quantum clusters: A density functional theory study

We investigate the effects of shape and single-atom doping on the structural, optical absorption, Raman, and vibra- tional properties of Ag13, Ag12CUl, CUl3, and Cul2Agl clusters by using the （time-dependent） density functional the- ory. The results show that the most stable structures are cuboctahedron （COh） for Ag13 and icosahedron （Ih） for CUl3, Agl2CUlcore, and Cul2Aglsur. In the visible-near infrared optical absorption, the transitions consist of the interband and the intraband transitions. Moreover, red shifts are observed as follows： 1） clusters change from Agl2CUlcore to Ag13 to Ag12Culsur with the same motifs, 2） the shapes of pure Agl3 and Agl2CUlcore clusters change from COh to Ih to decahe- dron （Dh）, 3） the shape of Agl2CUlsur clusters changes from Ih to COh to Dh, and 4） the shapes of pure CU13 and Cu12Agl clusters change from Ih to Dh to COb. All of the Raman and vibrational spectra exhibit many significant vibrational modes related to the shapes and the compositions of the clusters. The ranges of vibrational spectra of Ag13, Agl2CUl or CU13, and Cu12Agl clusters become narrower and the vibrational intensities increase as the shape of the clusters changes from Ih to Dh to COh.     

Effect of electromagnetic disturbance on the practical QKD system in the smart grid

To improve the security of the smart grid, quantum key distribution（QKD） is an excellent choice. The rapid fluctuations on the power aerial optical cable and electromagnetic disturbance in substations are two main challenges for implementation of QKD. Due to insensitivity to birefringence of the channel, the stable phase-coding Faraday–Michelson QKD system is very practical in the smart grid. However, the electromagnetic disturbance in substations on this practical QKD system should be considered. The disturbance might change the rotation angle of the Faraday mirror, and would introduce an additional quantum bit error rate（QBER）. We derive the new fringe visibility of the system and the additional QBER from the electromagnetic disturbance. In the worst case, the average additional QBER only increases about 0.17% due to the disturbance, which is relatively small to normal QBER values. We also find the way to degrade the electromagnetic disturbance on the QKD system.     

粘结固体润滑膜及其应用

粘结固体润滑膜是固体润滑材料的主要类型之一，因其性能优异而获得了从民用机械到空间技术等各个方面的广泛应用，几乎可以用到工程实际中所有的摩擦部件上．近年来，我国粘结固体润滑膜的应用除在航空航天等尖端技术方面继续保持原有的优势外，其在民用机械中的应用也在逐年增多．但是，由于大多数工程技术人员目前对粘结固体润滑膜还不够了解，实际使用中尚有一定的困难．针对这种情况，并且为了推动国内粘结固体润滑膜之研究与应用的更快发展，系统地对这类固体膜的分类、性能特点、制备工艺和典型应用等进行了综合介绍与评述，指出要充分发挥粘结固体润滑膜的优势，利用其创造更大的社会效益和经济效益，就应当重视开展对这种固体润滑材料与技术的工业应用研究．     

光泵亚毫米波激光的理论模型及计算方法(Ⅰ)

该作者曾对光泵亚毫米波激光作过系统深入地的研究。重点论述在小型光泵亚毫米波激光的理论研究中所应用的量子系统的半经典密度矩阵理论。     

光泵亚毫米波激光的理论模型及计算方法(Ⅰ)——半经典密度矩阵理论

该作者曾对光泵亚毫米波激光作过系统深入地的研究。重点论述在小型光泵亚毫米波激光的理论研究中所应用的量子系统的半经典密度矩阵理论。     

含二硫化钼、石墨和三氧化二锑的水性环氧树脂粘结固体润滑涂层的摩擦磨损性能

以水作为分散介质,制备了含MoS2、石墨和Sb2O3等组分的水性环氧树脂粘结固体润滑涂层;其具有价格低廉、无毒、不燃等优点,并且不含挥发性有机化合物（VOC）,是一类具有很好发展前景的环保型固体润滑涂层。采用MFT-R 4000型往复摩擦磨损试验机考察了所制备的水性环氧树脂粘结固体润滑涂层的摩擦磨损性能;利用扫描电镜和X射线光电子能谱仪分析了涂层磨损表面和转移膜的形貌,以及涂层磨损表面典型元素的化学状态,进而探讨了其润滑失效机理。结果表明：所制备的水性环氧树脂粘结固体润滑涂层具有良好的减摩抗磨性能;Sb2O3与MoS2之间,以及石墨与MoS2之间具有一定的协同减摩抗磨作用。相应的协同减摩抗磨作用分别源于机械相互作用以及水蒸气吸附导致的石墨层间吸引力减弱;而涂层发生润滑失效的主要原因为疲劳磨损和微断裂。     

Cr/Cr2O3多层薄膜的制备、力学及摩擦学性能研究

为了提高Cr2O3陶瓷薄膜的韧性及摩擦学性能,设计制备了Cr/Cr2O3软硬交替的多层薄膜,通过复配韧性层提高Cr2O3陶瓷薄膜的韧性及摩擦学性能,同时研究了调制周期对Cr/Cr2O3薄膜力学性能及摩擦学性能的影响.研究结果表明多层薄膜的韧性和第一临界载荷随调制周期的减小而增大,而其硬度随调制周期的减小而降低.调制周期为1 075 nm的薄膜表现出了最好的综合性能,即薄膜具有较好的膜基结合强度、较高的韧性和硬度,同时薄膜具有最好的抗磨损性能.     

基于PSO–GPR含缺陷管道失效应力预测

传统对含缺陷管道失效应力的预测方法存在误差偏大的问题。针对该问题，利用MATLAB软件建立基于PSO–GPR(particle swarm optimization–Gaussian process regression)含缺陷管道失效应力预测模型。通过对60组含缺陷管道的试验数据进行测试，发现预测结果与实测结果均在95%置信区间内，表明可以将均值作为预测结果。对预测结果进行分析表明：高斯过程回归的预测结果与实测结果的最小相对误差为0.003%，最大相对误差为1.205%，平均相对误差为0.319%，基于预测结果和实测结果的散点均落在曲线y=x的±1.3%误差带中，验证了高斯过程回归预测模型的准确性，为管道的工程实际应用与维修提供较为精准的判断依据。