双动态显示方式的软硬件设计

本文通过一个实例，介绍了利用并行口和串行口实现双动态显示的软硬件设计方法，并重点介绍了汉字显示方法。     

改性二胺扩链剂对合成聚脲性质的影响

为解决聚脲反应高活性方面存在的问题,对二胺扩链剂进行了改性。以己二胺为原料,在冰乙酸和磷酸条件下一步合成得到白色针状晶体产品即新型位阻型扩链剂二乙酰己二胺。并用红外光谱、凯氏定氮法和1H-NMR对其结构进行了表征,确定了合成产物的化学结构。将它和端氨基聚醚和4,4’-二苯甲烷二异氰酸酯(MDI)通过二步溶液法合成新型聚脲,考察二胺扩链剂改性对聚脲性能的影响。当用二乙酰己二胺代替己二胺合成聚脲时,其凝胶时间由原来的11s增加到52s,且拉伸强度大大提高。     

Influence of carbon on the synthesis of AlN powder from combustion synthesis precursors

AlN powders were synthesized by carbothermal reduction of combustion synthesis precursors. Water-soluble organics and carbon black were used as carbon sources. The effects of carbon on the synthesis of AlN powders were studied. Results showed that AlN powders were synthesized directly from γ-Al₂O₃ without γ-Al₂O₃ to α-Al₂O₃ phase transition when water-soluble organics were used as carbon sources, and the nitridation of the precursors could be completed at 1400 °C. However, AlN powders were synthesized from the nitridation of α-Al₂O₃ when carbon black was used as carbon source, and the reaction temperature for a complete conversion increased to 1500 °C. The particles of AlN powders synthesized with water-soluble organics was smaller than the particles of AlN powders synthesized with carbon black and their particle size distribution was sharper. The specific surface area of synthesized AlN powders increased with the increase of carbon content in the precursors.     

Effects of rare earth elements on properties of AB5-type electrode materials at different temperature

Discharge property is an important factor to evaluate electrode materials. The discharge capacity of the hydrogen-storing alloys are not only influenced by its thermodynamic property but also closely related to its dynamic property. When the temperature changes, the degrees of influence of the above-mentioned two factors on the discharge performance vary accordingly. As a consequence, adjusting compositions of the alloys to make them have good discharge performance under a relatively wide range of temperature is of great significance. On the basis of great deal of experimental investigation, the optimum combination of rare earth elements in hydrogen-storing electrode materials using at-30-55℃ is determined and the relationships between the cell parameters and discharge performance of alloys at -30℃ are discussed. Additionally, the DFEC calculation method has been improved to predict the discharge capacities, which is in good agreement with the experimental ones. This is of theoretical significance in investigating new hydrogen-storing alloys of the AB5 type.     

基于交流斩波的新型照明节电器研究

针对城市照明系统,设计了一种基于交流斩波技术的新型城市照明节电器。介绍了交流斩波技术的原理以及交流斩波调压控制技术。经仿真和样机试验结果证明,该节电器具有结构简单、效率高、工作可靠、无级调压等优点,用于城市照明可有效节省电能,产生巨大的经济效益和社会效益。     

船体板材成形模具与装备耦合分析

通过对船体板材成形模具与装备的一体化耦合建模,采用有限元分析模拟软件ANSYS对其刚度和强度进行模拟分析,然后与装备自身的刚度和强度进行对比分析,找出成形模具与装备各自对船体板材成形精度的影响,从而优化船体板材成形模具与装备的刚度和强度设计.在保证船体板材成形精度的前提下,可以合理简化成形模具与装备的结构,降低生产成本,获得更高的经济效益.     

可逆变流器正弦滞环宽度控制方法

滞环控制方法具有动态响应速度快和电路结构简单的优点,该方法获得了广泛的应用和发展。从改善系统的输入电流谐波总畸变率THD（Total Harmonic Distortion）角度,提出一种改进的正弦滞环宽度控制方法,可有效减小脉宽调制（PWM）可逆变流器系统的THD。在PWM可逆变流器系统状态空间模型的基础上利用Psim仿真软件进行分析。和固定滞环宽度控制方法相比．应用改进的正弦滞环宽度控制方法,系统具有更小的THD。快速傅里叶变换结果表明,应用改进的正弦滞环宽度控制方法．系统具有更小的谐波含量。     

Study of microstructures and of domestic X70 properties for girth welding pipeline steels

With the development of domestic pipeline steels, it is necessary to develop suitable welding technology which can improve the properties of the welded pipeline. In this paper, the microstructures and mechanical properties of domestic XTO pipeline steels and welded joints are discussed. The welding consumables of BOHLER E6010 and HOBART 81N1 are matched for girth welding. The following characteristics in heat-affected zone（ HAZ） are indicated that microstructures of intercritical HAZ（ ICHAZ） is finer and more uniform, the grain sizes of fine-grain HAZ （ FGHAZ） and subcritical HAZ （ SCHAZ） are smaller than that of coarse-grain HAZ（ CGHAZ）. The hardness, tensile strength and toughness of welded joints come up to the standard. The micrographs of impact specimens in welded joints are cleavage, quasi-cleavage and dimple which shows there is typical ductile rupture.     

氮掺杂金刚石膜的生长特性

采用电子辅助化学气相沉积法(EA-CVD),在含氮气氛中制备出金刚石膜,利用SEM、Raman光谱、EPR测试手段研究了氮气对金刚石膜品质的影响及氮掺杂特性.结果表明,在950℃基片温度下,沉积气氛中掺入氮气后,金刚石膜晶形变为"菜花状", 非金刚石碳的含量增加,膜的品质下降.在800℃基片温度下,沉积气氛中掺入氮气后,孪晶和二次成核减少,金刚石膜的结晶形貌得到改善.通过Raman光谱和EPR分析发现,在金刚石膜中氮杂质主要以Ns0,[N-V]0和[N-v]-1的形式存在,而且随着氮气流量的增加,Ns0的含量增加,[N-V]0含量减少,[N-V]-1含量变化不明显.     

环介导等温扩增技术在转基因成分检测中的应用

随着全球转基因作物商业化种植面积持续增长,转基因成分检测作为转基因作物安全管理的重要技术支撑受到越来越多的关注,世界各国与地区不断致力于转基因成分检测技术的开发。环介导等温扩增（loop-mediatedisothermal amplification,LAMP）技术由于简单快速等特点,近年来在转基因检测领域备受青睐。本文对LAMP技术在转基因成分检测中的最新研究与应用及其发展前景加以综述。