AHP中增加一组元素的严格保序性条件

给出了左主特征向量法（LEM）下增加一组元素严格保序的充要条件,通过研究在右主特征向量法（REM）,左主特征向量法（LEM）,几何平均特征向量法（GMEM）下增加一组元素严格保序的条件之间的关系,从而给出GMEM下增加一组元素严格保序的充分条件。     

Tribological properties of diamond-like carbon films deposited by pulsed laser arc deposition

A novel method, pulsed laser arc deposition combining the advantages of pulsed laser deposition and cathode vacuum arc techniques, was used to deposit the diamond-like carbon (DLC) nanofilms with different thicknesses. Spectroscopic ellipsometer, Auger electron spectroscopy, x-ray photoelectron spectroscopy, Raman spectroscopy, atomic force microscopy, scanning electron microscopy and multi-functional friction and wear tester were employed to investigate the physical and tribological properties of the deposited films. The results show that the deposited films are amorphous and the sp$^{2}$, sp$^{3}$ and C--O bonds at the top surface of the films are identified. The Raman peak intensity and surface roughness increase with increasing film thickness. Friction coefficients are about 0.1, 0.15, 0.18, when the film thicknesses are in the range of 17--21~nm, 30--57~nm, 67--123~nm, respectively. This is attributed to the united effects of substrate and surface roughness. The wear mechanism of DLC films is mainly abrasive wear when film thickness is in the range of 17--41~nm, while it transforms to abrasive and adhesive wear, when the film thickness lies between 72 and 123~nm.     

磷钼酸对直接甲醇燃料电池阴极氧还原的促进作用

以磷钼酸(H₄PMo₁₂O₄0·xH₂O,PMo₁₂)为直接甲醇燃料电池(DMFC)阴极添加剂,制备了Pt-PMo₁₂/C复合催化剂.电化学测试表明,该添加剂对于DMFC阴极氧还原具有明显的促进作用,与常规的Pt/C催化剂相比,相同载量下极限扩散电流提高了56.3%.在单电池性能测试中,这种促进作用使电池的最大输出功率提高了28%.     

攀援植物的行为及其生态适应方式和原则

攀援植物的攀援方式、化学性防御等行为遵循进化稳定性的原则;攀援植物在异质生境,如不同的光环境及不同的支撑条件下的觅食行为,遵循形态可塑性的原则.攀援植物行为的生态适应意义主要体现在保证了其个体的生存和种群的延续.     

如何理解argz

学习一个重要的数学概念,一要把握基本,二要横向联系,三要纵向深化,四能运用自如,即所谓“学懂、学通、学深、学透”．argz是复数的一个重点,也是一个难点,本文拟对其进行多层面剖析,以期对同学们的学习有所帮助．     

胶体法制备Mn2+掺杂Ⅱ-Ⅵ族稀磁性半导体纳米晶体材料的研究进展

近年来兴起的稀磁性半导体纳米晶体(DMSNC)是一种新型的半导体材料,由于其优异的光电磁性能得到了国内外研究人员的重视,并取得了快速发展,有望在多个领域得到应用。本文对以胶体法制备的Mn2 掺杂的ZnS、ZnSe、CdS、CdSe等为代表的Ⅱ-Ⅵ族DMSNC的主要研究进展和掺杂原理进行了综述,指出了现阶段所存在的问题,并对其未来发展进行了展望。     

钌催化末端炔丙醇经亚丙二烯基卡宾中间体氧化产生亚甲基烯酮:α,β-不饱和羧酸衍生物的合成

报道了钌催化末端炔丙醇经亚丙二烯基卡宾中间体氧化产生亚甲基烯酮合成α,β-不饱和羧酸衍生物的高效方法.机理研究实验表明,催化剂CpRuC1(PPh3)2/NaBPh4和末端炔丙醇反应产生的钌亚丙二烯基卡宾与吡啶氧化物发生氧转移,生成高活性的亚甲基烯酮中间体,再发生亲核加成得到α,β-不饱和产物.该反应提供了一个机理上完...     

Rapid Thermal Annealing Effects on Structural and Optical Properties of Self-Assembled InAs／GaAs Quantum Dots Capped by InAIAs／InGaAs Layers

Effects of rapid thermal annealing on the optical and structural properties of self-assembled InAs/GaAs quantum dots capped by the InAlAs/InGaAs combination layers are studied by photoluminescence and transmission electron microscopy. The photoluminescence measurement shows that the photoluminescence peak of the sample after 850℃ rapid thermal annealing is blue shifted with 370meV and the excitation peak intensity increases by a factor of about 2.7 after the rapid thermal annealing, which indicates that the InAs quantum dots have experienced an abnormal transformation during the annealing. The transmission electron microscopy shows that the quantum dots disappear and a new InAlGaAs single quantum well structure forms after the rapid thermal annealing treatment. The transformation mechanism is discussed. These abnormal optical properties are attributed to the structural transformation of these quantum dots into a single quantum well.     

大孔径静态干涉光谱仪图像压缩技术

从图像压缩的角度分析了大孔径静态干涉成像光谱仪成像原理，并提出了一种新的遥感多光谱图像压缩方案。新方案利用大孔径静态干涉成像光谱仪推扫成像特点提出了一种低存储量，帧间小波域匹配的图像序列压缩方法，提高图像质量3～4dB。为了保证图像的光谱信息在8倍压缩比下有效应用，系统采用了一种新的感兴趣区域(ROD编码技术。感兴趣区域编码时，由于方案中采用率失真优化斜率提升，而不是比特平面移位，从而使图像在相同的光谱分辨率下拥有更好的空间分辨率。实验结果表明，算法大大保护了图像的光谱特性，在8倍压缩比下，满足了该类干涉多光谱遥感图像的质量要求。     

Effect of the Initial Laser Phase on the Interaction Between Relativistic Electron and Ultra－Intense Laser Field in a Strong Uniform Magnetic Field

We investigate the influence of the initial laser phase on the interaction between relativistic electron and ultraintense linear polarized laser field in a strong uniform magnetic field. It is found that the dynamic behaviour of the relativistic electron and the emission spectrum varies dramatically with different initial laser field phases.The effect of changing initial phase is contrary in the two parameter regions divided by the resonance condition.The phase dependence of the electron energy and velocity components are also studied. Some beat structure is found when the initial laser phase is zero and this structure is absent when the initial laser phase is a quarter of a period.