浅析民国广州粤语影片的查禁与“救亡”

1936年,出于政治和现实的考量,南京国民政府颁布粤语影片禁令。对此,华南电影协会发起了粤语影片“救亡”运动。广州与中央就粤语影片“禁”与“缓禁”的问题,反复博弈,因广州当局积极从中斡旋及抗日战争的全面爆发,国民政府无力执行严厉的查禁政策．“救亡”运动最后以双方的妥协而告终．     

Theoretical investigation of Ag_n@(ZnS)_(42)(n=6-16) using first principles:Structural,electronic and optical properties

Ag@ZnS nanoparticles display enhanced photocatalytic efficiency and good photoelectric properties compared to their single-component counterparts in the process of forming a core-shell structure using an Ag cluster as the inner core of a ZnS outer shell.In this study,first-principles calculations were used to investigate the structural,electronic,and optical properties of Ag_n@(ZnS)_(42)(n=6-16)core-shell nanocomposites.The calculated results show significant even-odd oscillations in the structural stability,that is,Ag@ZnS nanostructures with an even number of Ag_n core atoms are relatively more stable than those with an odd number of core atoms.The secondorder differences in the total energies(Δ_2E)and the core-shell interaction energy E_(cs) indicate that a Ag_(12)@(ZnS)_(42)nanostructure is the most stable configuration.A significant red shift was found in Ag_n@(ZnS)_(42)nanoparticles in the absorption spectrum compared with a(ZnS)_(48) nanostructure,which is likely attributed to the strong electron interactions between the Ag core and the ZnS shell.     

AISI 329不锈钢表面制备纳米薄膜

通过对激光作用热环境的数值模拟估算出表面温度变化和冷却速率,说明了不锈钢表面纳米和亚微米薄膜的形成过程。X射线分析可得:不同激光能量密度作用下,不锈钢表面后所得薄膜相组成与原始不锈钢相组成相同。     

中国商业电影题材趋同性经验研究

中国商业电影题材有明显的趋同现象,题材趋同主要源于电影制片商采取的产品差异最小化策略。研究首先以Hotelling模型为基础构造一个双寡头竞争模型,论证了电影题材趋同现象发生的必然性;其次,进行描述性统计分析,以近五年全国票房收入前十的商业影片来估计观众对电影题材的偏好,以检验制片商策略的有效性,从而对理论进行经验验证;最后,分析了影响中国电影题材趋同的外部因素,包括中国电影的融资环境、制片商规模以及宏观政策调控,这些因素加速了中国电影题材的趋同趋势。     

基于FPGA的数字下变频模块设计

雷达数字下变频模块电路的主要作用是对接收到的中频回波信号进行A/D变换,并进行数字下变频处理。数字下变频(DDC:Digital Down Convert)技术是将中频信号数字下变频至零中频,且使信号速率降至通用DSP器件能处理的速率的技术。本文介绍了一种基于FPGA的6通道数字下变频模块设计,接收6路中频模拟信号,经ADC进行模数变换后送至FPGA进行数字下变频处理,数字信号经光纤收发模块传输至信号处理单元。     

制备条件对反式聚合物稳定胆甾相织构膜电光性能的影响

选用1,4-双[4-(6-丙烯酰氧基己氧基)苯甲酰氧基]-2-甲苯(C6M)/(S)-4'-(2-甲基丁基)-4-联苯腈(CB15)/安息香二甲醚(IRG651)/SLC1717复合体系,通过紫外光聚合诱导相分离法制备了反式聚合物稳定胆甾相织构(R-PSCT)膜.研究了聚合温度和紫外光辐照度对所制备的R-PSCT膜电光性能的影响.随着聚合温度的升高或紫外光辐照度的减小,R-PSCT膜的驱动电压、对比度和开态响应时间减小,而关态响应时间增大.在聚合温度为293 K和紫外光辐照度为0.75 mW·cm-2时,所制备的R-PSCT膜具有较佳的电光性能.     

基于人工免疫算法的光学影像与SAR影像配准方法

提出了一种基于人工免疫算法的光学影像和SAR影像配准方法,该方法从影像上的面状地物入手,仅从识别性较好的光学影像上提取面状地物,先随机给定一组配准参数,将光学影像上面状地物的坐标经仿射变换获得新的坐标,以转换后新坐标在SAR影像上对应区域的均质性为评价标准,并利用人工免疫算法对配准参数进行优化,从而得到影像配准结果.最后,利用WorldView-2和RadarSat-2影像的配准实验验证该方法的有效性,结果表明该方法配准精度可优于2像素.     

超声喷雾热解法制备AZO薄膜及其光致发光性能研究

利用超声喷雾热解法以乙酸锌、硝酸铝为Zn、Al源配制前驱体溶液,按不同的Z n、A l原子比（1∶0．02,1∶0．03,1∶0．04,1∶0．05和1∶0．06）在单晶硅（100）衬底上制备出具有较好光致发光性能的ZnO ：Al（AZO）薄膜．采用X射线衍射仪（XRD）、扫描电子显微镜（SEM ）和光致发光谱（PL ）表征了样品的晶体结构、表面形貌和光致发光性能．结果表明：所制备样品属于纤锌矿ZnO 结构,且择（002）取向生长,薄膜表面比较平整,具有较好的光致发光性能．并且Al掺杂量对AZO薄膜的紫外发射性能有重要影响,随着Al掺杂量的增加,紫外发射峰先蓝移后红移．在Zn、Al原子比为1∶0．04时得到的AZO薄膜结晶质量最好,蓝移量最大,光致发光性能最佳．     

Characteristic analysis on the physical properties of nanostructured Mg-doped CdO thin films—Doping concentration effect

Highly conductive and transparent magnesium-doped cadmium oxide(CdO :Mg) thin films have been deposited on suitably cleaned glass substrates maintained at 375℃ by spray pyrolysis technique using perfume atomizer. The magnesium content in the films is varied from 0 to 8 at%in steps of 2 at%. The effect of Mg doping on the structural, morphological, optical and electrical properties of the CdO thin films has been studied.All the films exhibited cubic structure with a preferential orientation along the(1 1 1) plane irrespective of the Mg doping level. SEM analysis showed that the film morphology modifies from spherical shaped grains to closely packed cauliflower shaped nanostructures with Mg doping.Except for the film coated with 2 at% Mg dopant, all the other doped films exhibited a blue shift in the optical band gap. Electrical studies revealed that the Cd O:Mg film coated with 8 at% Mg dopant had a minimum resistivity of 0.0853*10~1Ω-cm.     

涂层弹性模量的测量方法

弹性模量是一个特别重要的材料参数,经常用来评价涂层（薄膜）的特性,对接触应力场、涂层的剥离、断裂和涂层内部的残余应力状态有重要影响。本文介绍了当前测量涂层弹性模量的方法及其原理,并分析了各种方法适用的涂层范围,为涂层弹性模量测量方法的选择提供依据。