嵌入式二维码数据无线多点传输系统设计

设计了一种基于FreeRTOS嵌入式操作系统的二维条码无线传输系统,描述了系统的软硬件实现方法和多点数据传输的链路控制机制。系统主控芯片采用通用的MCU芯片STM32,结合二维码扫描引擎和蓝牙传输模组实现多个扫描终端与基座间的数据传输。     

Ni纳米粉体及其合金的制备与研究进展

纳米Ni及其合金是一类重要的磁性材料和抗磨损材料,被广泛用于催化剂、电池、涂层、通讯以及电子等诸多领域。本文就纳米Ni及其合金的制备进行综述,描述和分析了目前各种主要制备方法的特征及各自的优缺点,并对其应用前景作出了进一步的展望。     

Texaco与Shell煤气化工艺比较分析

煤气化技术对于促进煤炭的综合利用、改善当前资源紧缺状况,并减少环境污染具有重要的意义。阐述了Texaco和Shell煤气化的工艺流程,并对2种煤气化工艺进行了比较分析,找出各自的优缺点,为煤气化工艺的选择提供参考。     

纳米羟基磷灰石合成方法研究新进展

介绍了纳米羟基磷灰石合成的有效方法，对各种方法进行了比较分析，提出相应的改进方向。     

融合语言学统计特征的韵律发音质量自动评测方法

在发音质量自动评测任务中,韵律发音质量评测是非常重要的高级环节,对语音的自然度和可理解程度方面有着直接和重要的影响。本文在韵律相关的多种声学特征的基础上,进一步融合了韵律相关的多种语言学统计特征,并使用支持向量机为分类模型,实现对韵律发音质量的有效评测,人机相关性达到0.779,相对提升了3.45%。同时,采用基于浮动思想的SFFS算法进行特征筛选,去除了目标无关的特征,提高了支持向量机模型的精度和泛化能力,进一步提升了评测性能。     

Preparation and surface activity of modified soy protein

A series of novel surfactants have been prepared by the reaction of hydrolyzed soy protein with alkyl succinic anhydride. These novel surfactants exhibit excellent surface active properties including surface tension, foaming, emulsifying, wetting power, and buffer ability. The hydrophobic modified protein exhibit more surface activity than original protein because of the enhanced hydrophobicity in structure. The increase in hydrophobic chain length leads to an increase in the surface activity. The surface tension reduction is correlated to the hydrophobicity of the modified molecule, which was determined by a fluorescent probe. In application on cotton bleaching procedures, these surfactants increase the whiteness of fabrics. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3498–3503, 2006     

Zeolite‐catalyzed isomerization of oleic acid to branched‐chain isomers

Branched‐chain (bc) saturated fatty acids (SFA) have potential as oleochemical intermediates since they have better oxidative stability than linear unsaturated fatty acids (UFA) and have better low‐temperature properties than linear SFA. Previous studies in converting UFA to bc‐FA using clay catalysts have resulted in only modest yields and conversions. Recent reports, however, have suggested that certain zeolites can be effective catalysts for converting UFA to bc‐FA in higher yields and conversions. In this work, we examined the scope and potential of the zeolite‐catalyzed synthesis of bc‐FA starting from readily available monounsaturated linear FA. Our results show that common UFA such as oleic acid can be converted to bc‐isomers using modified Ferrierite zeolite catalysts with high conversions (98%) and high selectivity (85%) and that the zeolite catalysts are reusable for at least three cycles. The positions of branching (methyl) on the FA chain were determined from the GC‐MS spectra of the picolinyl esters of the bc‐FA.     

高温下煤焦气化反应特性(Ⅰ)灰分熔融对煤焦气化反应的影响

在900～1500℃灰分的熔融温度范围内和常压下,研究了煤焦与二氧化碳的气化反应。实验研究发现,活化能随气化过程而变化,除反应初期外,气化反应严重受内扩散过程的影响。高温下的煤焦气化存在一个特性温度,在该温度下,反应中、后期气化速率显著降低,其影响范围在特性温度上下约200～300℃。特性温度与煤种及灰分性质等因素有关,一般低于其相应灰分的软化点温度。     

两种高压直流电源的比较及在铜冶炼烟气制酸装置电除雾器中的应用

论述恒压源与恒流源两种高压直流电源的工作原理和技术特点.对两种电源常见故障的原因进行分析，提出相应的解决方法。介绍两种电源在230kt／a诺兰达炉冶炼烟气和270kt／a转炉冶炼烟气制酸装置的电除雾器中的使用情况.     

PVC用ACR加工助剂的作用

简要介绍了ACR加工助剂发展历史及其改进PVC加工性能的作用，包括对PVC的离模膨胀、熔体破裂、熔体粘度和融化的影响。并讨论了不同生产商的ACR加工助剂及其在PVC中的不同用途。