纳米四氧化三钴的合成表征及各自在电化学性能的研究

以六水合硝酸钴(Ⅱ)、六水合氯化钴(Ⅱ)为原料制备纳米级别的棒状四氧化三钴、管状四氧化三钴及片状四氧化三钴.利用XRD对制备的产物与原料、中间体进行对比研究,利用SEM观察产物形貌,并利用电化学工作站对不同产物的电化学性能进行研究.经研究发现,在以2 mol/L KOH溶液为电解液的条件下,四氧化三钴纳米棒的电化学性能...     

1.55μm AlGaInAs/InP小发散角量子阱激光器的仿真和制备

理论仿真和实验制备了AlGaInAs/InP材料1.55 μm小发散角量子阱激光器。为了扩展近场光场并减小内损耗,将一个非对称模式扩展层插入到外延结构的下盖层当中。仿真结果表明,该模式扩展层除了少量增加激光器阈值电流以外,在不影响激光器其它性能的情况下能显著减小激光器的垂直远场发散角。实验结果与理论仿真高度吻合。成功制备出脊宽4 μm,腔长1000 μm的脊波导小发散角激光器。在端面未镀膜的情况下,该激光器阈值电流为56 mA,输出功率为17.38 mw@120 mA,斜率效率可以达到0.272 W/A。实验测得垂直远场发散角为29.6°,相比较传统激光器减小了约35.3%。     

精氨酸微生物限度检查方法的验证

目的建立精氨酸微生物限度检查方法,并对方法进行验证。方法用薄膜过滤法进行细菌、酵母菌、霉菌计数;用薄膜过滤法进行控制菌检查。结果 5株试验菌回收率均大于70%,符合中国药典2010年版验证试验的基本要求。结论该方法消除了样品的抑菌性,可用于该品种的微生物限度检查。     

用高低温循环加速试验评估光源模块长期贮存寿命的研究

Light source modules are the most crucial and fragile devices that affect the life and reliability of the interferometric fiber optic gyroscope （IFOG）. While the light emitting chips were stable in most cases, the module packaging proved to be less satisfactory. In long-term storage or the working environment, the ambient temperature changes constantly and thus the packaging and coupling performance of light source modules are more likely to degrade slowly due to different materials with different coefficients of thermal expansion in the bonding interface. A constant temperature accelerated life test cannot evaluate the impact of temperature variation on the performance of a module package, so the temperature cycling accelerated life test was studied. The main failure mechanism affecting light source modules is package failure due to solder fatigue failure including a fiber coupling shift, loss of cooling efficiency and thermal resistor degradation, so the Norris-Landzberg model was used to model solder fatigue life and determine the activation energy related to solder fatigue failure mechanism. By analyzing the test data, activation energy was determined and then the mean life of light source modules in different storage environments with a continuously changing temperature was simulated, which has provided direct reference data for the storage life prediction of IFOG.     

高边模抑制比高稳频的980nm光纤光栅外腔半导体激光器

The coupling cavity theory is used to analyze the impact of high side mode suppression ratio （SMSR） on fiber grating external cavity semiconductor lasers （FGECSL）. The high SMSR and high stable frequency FGECSLs were obtained by experiment. The center wavelength is 974 nm, SMSR is 45 dB, the center wavelength change rate reaches 3.08 ppm/℃ in the temperature range of -20 to 80 ℃.     

煤与废塑料的共液化研究进展

介绍了煤和废塑料共液化的机理、工艺条件以及近期的研究结果,并为今后的深入研究提供了思路。     

柚皮化学改性及其对Fe3+、Zn2+吸附性能的研究

利用异丙醇和氢氧化钠对柚皮进行化学改性,发现其对Fe3+和Zn2+的吸附能力大大提高,而且经两种试剂处理后的柚皮,比单独用异丙醇处理的吸附性能更好.经异丙醇和氢氧化钠处理后的吸附剂对Zn2+的吸附量随着Zn2+浓度增大而增大,当Zn2+浓度达到0.75×10-3 mol/L后趋于平衡;且对Fe3+的吸附量也随Fe3+浓...     

具有高催化活性的P-TiO_2结构及制备条件的探究

通过简便的凝胶-溶胶法成功地将P5+引入TiO_2晶格内部,从而提高光催化活性。当P和Ti的摩尔比为1∶15时,P-TiO_2的光催化性能达到最佳,对亚甲基蓝的降解率达到73. 55%,与TiO_2相比降解率提高11. 83%。该工艺具有经济、环保、高效的优点,适用于处理水体和大气中有机污染物的处理,以及其他环保领域的应用。     

建筑工程资料存在的问题与对策

就工程资料的管理、收集、归档各环节存在的一些普遍问题，通过分析问题产生的原因，提出了相应的解决措施。提出工程资料真实、准确、完整、规范，才能确保工程质量有据可查。