以就业为导向的“数字印刷”课程教学改革研究

结合高等教育本科类院校印刷工程专业的特点,本研究提出了采用以促进学生就业为导向的＂数字印刷＂课程教学改革思路与方法。主要包括对＂数字印刷＂课程的教学内容进行模块化的整合优化、加强互动式和启发式教学方法的创新运用、设计整合性实验、积极建设校外教学实习基地,并对课程实习与生产实习的内容与方法进行了改革创新。     

丙烯酸酯乳液共聚物胶粘剂的合成性能及应用

本文对近十几年来国内在丙烯酸酯类乳液胶粘剂的合成，性能及应用方面所做的工作进行了综述。在合成方面，涉及了配方中各成份的作用，合成工艺条件及影响合成的因素等．在性能方面论述了影响性能的各因素，并阐述了丙烯酸酯乳液胶粘剂的用途。     

Enhanced band-edge photoluminescence from ZnO-passivated ZnO nanoflowers by atomic layer deposition

The ZnO nanoflowers were synthesized by reactive vapor deposition. A secondary nucleation in the stalk/leaves interface was suggested. The photoluminescence revealed that there were many oxygen vacancies in the nanoflowers. To tune the optical properties of ZnO nanoflowers, ZnO thin films with varying thicknesses were coated on the nanoflowers by atomic layer deposition, which can distinctly improve the band-edge photoluminescence properties.     

汽柴液收率下降原因分析及应对措施

近期我装置汽柴液的总收率下降近2个百分点,文章就此问题做了具体分析,最终确定是催化剂重金属中毒的缘故,后经调整催化剂配方,并大量置换中毒催化剂使得汽柴液总收率达到原来的水平。     

基于热失重法的热塑性聚氨酯热氧老化特性分析及其降解动力学模型

采用热塑性聚氨酯（TPU）在40℃、50℃、60℃、70℃下进行人工加速热老化,利用热失重分析法（TG）对TPU热降解过程进行分析,探讨了TPU在老化过程中的热失重特性及其热降解动力学模型。测试结果表明,TPu热失重过程可分为硬段和软段热裂解两个阶段;硬段和软段各自最快热降解速率随老化温度和时间的增加没有明显变化。然而,通过对TPU热失重5％时对应的温度进行分析,得出该温度随着热氧老化时间的延长而逐渐下降,说明TPu的热稳定性随老化时间的延长而逐渐降低。采用Coats—Redfern方法对TPU的热降解动力学进行研究,结果表明,TPU的热降解符合0级反应动力学方程。     

丁苯橡胶凝聚水中防老剂含量的测定及其对COD的影响

设计了不同防老剂配方量的丁苯橡胶凝聚水,采用高效液相色谱法(HPLC)测定了环保型丁苯橡胶(SBR)1500E凝聚水中的防老剂烷基-芳基-对苯二胺复配物(EPPD)含量。配制不同质量浓度(ρ)的防老剂EPPD水溶液并检测其化学需氧量(COD),进而确定了的ρ-COD标准曲线,根据HPLC检测结果和ρ-COD标准曲线可得出凝聚水样品中防老剂对水体COD的贡献率。     

Experiment and analysis of the effect of fine tracking system on the unstable platform in laser communication

Atmospheric turbulence and platform vibration in the space optical communication can cause the offset and jitter of beam, which further result in the fluctuations of received optical power. To resist this effect, a communication system with fine tracking systems in the receiver and transmitter is designed. The system is used in the experiment of laser communication between high-rise buildings over a distance of 3.5 km. After adding a vibration source to the transmitter, the centroids of spots captured by the camera of the transmitter and the optical power of receiver are recorded for the purpose of analysis. When the vibration source works at the designated frequency, a peak appears at the corresponding frequency in the spectrum of the spot centroids and the optical power of receiver. Then the peak disappears once the fine tracking system begins to work. Compared with the condition without the fine tracking system, the minimum value of the optical power of receiver is increased by 5 dB, and the standard deviation is decreased by 30%.     

基于激光测距的自动防撞系统方案设计

利用Matlab/Simulink软件对汽车仿真系统进行建模,模拟当汽车行驶过程中遇到障碍物情况下,驾驶员未及时采取防御措施时,对汽车的自动防撞系统进行仿真,给出了系统的工作过程中行车与障碍物的距离与行车速度的仿真图形。结果表明：该系统对降低汽车碰撞发生率与碰撞造成的交通损失具有理论可行性。     

高速铁路场景下时变信道的平稳区间研究

The non-stationary behavior, caused by the train movement, is the main factor for the variation of high speed railway channel. To measure the time-variant effect, the parameter of stationarity interval, in which the channel keeps constant or has no great change, is adopted based on Zhengzhou-Xi'an (Zhengxi) passenger dedicated line measurement with different train speeds. The stationarity interval is calculated through the definition of Local Region of Stationarity (LRS) under three train velocities. Furthermore, the time non-stationary characteristic of high speed railway channel is compared with five standard Multiple-Input Multiple-Output (MIMO) channel models, i.e. Spatial Channel Model (SCM), extended version of SCM (SCME), Wireless World Initiative New Radio Phase II (WINNERII), International Mobile Telecommunications-Advanced (IMT-Advanced) and WiMAX models which contain the high speed moving scenario. The stationarity interval of real channel is 9 ms in 80% of the cases, which is shorter than those of the standard models. Hence the real channel of high speed railway changes more rapidly. The stationarity intervals of standard models are different due to different modeling methods and scenario definitions. And the compared results are instructive for wireless system design in high speed railway.