系统组分数的确定

分析了组分数表达式中各个量的意义,并举例说明组分数的计算。讨论了化学平衡和反应进行到底2种情形对系统组分数的影响:化学平衡中生成物只有1相的,化学平衡考虑与否不会影响组分数;可进行到底的反应,在特定条件下可按照化学平衡来处理。最后总结了快速确定系统组分数的步骤。     

硅树脂对多孔氧化铝基陶瓷的制备及强化效应的影响

以氧化铝粉为基体,热固性硅树脂为粘结剂,利用热压注方法制备出多孔氧化铝基陶瓷试样,接着又用液态硅树脂对该试样进行强化处理.结果表明:以硅树脂为粘结剂,制备的氧化铝基陶瓷在1500℃烧结后,具有46.99;的显气孔率,22.15 MPa的抗弯强度,0.23;的收缩率,但其1600℃高温抗弯强度仅为2.04 MPa.在液态硅树脂强化后,其室温强度达到了37.67 MPa,高温强度也相继增加,在1600℃下,其强度增加到10.18 MPa.     

Sm填充型方钴矿化合物的高温高压合成及电输运特性研究

利用高温高压方法在2 ~ 5.0 GPa和900 K的合成条件下成功合成出系列立方相Sm填充型方钴矿化合物SmxCo4Sb12 ( x= 0.2, 0.6, 0.8 ) 体热电材料,并系统地研究了合成压力及不同的Sm填充分数对其室温下的电输运特性（电阻率、Seebeck系数、功率因子）的影响. 研究结果表明, Sm填充型方钴矿化合物SmxCo4Sb12为n型半导体. 在不同压力下,随着Sm填充分数的增加,Seebeck系数的绝对值和电阻率均呈现降低趋势. 在2 GPa,900 K条件下合成的Sm0.8Co4Sb12化合物功率因子达到最大值5.88 μW /( cm·K2).     

设计控温装置研究液体表面张力系数与温度的关系

介绍了自行设计、搭建的测量液体表面张力系数与温度关系的实验装置,用毛细管法测量了不同温度下水和乙醇的表面张力系数,得到了它们与温度的线性关系.利用此装置还可以进行其他对样品温度测控要求较高的实验.     

RAP晶体积分衍射效率的实验研究

以北京同步辐射装置的4B7中能束线为光源,对RAP（邻苯二甲酸氢銣）晶体的积分衍射效率进行了实验标定.结果显示:晶体在不同能量段都得到了完整的衍射峰,扭摆曲线的光滑性和对称性较好,在偏离布喇格角以后衍射效率都迅速下降到本底量级.在2.1~5.8 keV范围内,晶体的积分衍射效率在1×10－4rad左右.     

平行摄像机阵列移位法获取视差图像的研究

平行摄像机阵列移位法是一种摄像机阵列获取三维场景的视差图像的新方法.该方法在平行摄像机阵列法的基础上,将获取的视差图像进行平移处理,获得了立体显示所需的具有正、负水平视差的视差图像,且这些视差图像没有楔形失真和垂直视差.该方法集中了会聚摄像机阵列法和平行摄像机阵列法两种常规方法各自的优点并摒弃了其缺点.实验证实,所获取的视差图像在光栅式自由立体显示器上得到了三维场景的清晰逼真再现显示效果.     

池水瞬态闪蒸时间的实验研究

实验研究了过热度、初始水温及水位高度对方腔内池水瞬态闪蒸时间的影响.实验条件为:水位高度40 mm、60mm、100 mm,初始水温36～88℃,过热度2.1～48℃.实验结果表明:过热度及水位高度是影响闪蒸时间的主要因素,过热度及水位高度越大,闪蒸时间越长;过热度相同时,初始水温对闪蒸时间的影响很小.通过对实验数据分析,拟合出瞬态闪蒸时间的计算关联式.     

On General MOiler Transformation

We give a study on the general Moiler transformation and emphatically introduce its differential form. In this paper, a definition of acceleration is given in spacetime language and the inertial reference frame is also settled. With a discussion of the geodesic equations of motion, the differential form of the general MФller transformation at arbitrary direction is presented.     

Formation of Hot Images in Laser Beams through a Self-defocusing Kerr Medium Slab

A nonlinear hot image is usually thought as of a special case of self-focusing, and thus occurs when a laser beam propagates through a slab of self-focusing medium. Here we show theoretically that a hot image may also be formed by a thin slab of self-defocusing medium. The physical origin for this hot image formation is akin to the in-line volume-phase holographic imaging due to the intensity-dependent refractive-index modulation of the self- defocusing medium. NumericM simulations confirm the theoretical prediction and further identify the dependence of the hot image on the beam power, the modulation depth of obscuration and the thickness of self-defocusing medium. The analysis presented here brings new insight into the physics of hot image formation in the high power laser system.     

Anomalous Pressure Behavior of N-Cluster Emissions in GaAs0.973Sb0.022N0.005

Photoluminescence of GaAs0.973Sb0.022N0.005 is investigated at different temperatures and pressures. Both the alloy band edge and the N-related emissions, which show different temperature and pressure dependences, are observed. The pressure coefficients obtained in the pressure range 0-1.4GPa for the band edge and N-related emissions are 67 and 45meV/GPa, respectively. The N-related emissions shift to a higher energy in the lower pressure range and then begin to redshift at about 8.5GPa. This redshift is possibly caused by the increase of the X-valley component in the N-related states with increasing pressure.