Synthesis of pH-responsive isolated soy protein/carboxymethyl chitosan microspheres for sustained pesticide release

In order to improve the utilization rate of avermectin (AVM), a complex was prepared by electrostatic self-assembly using isolated soy protein (ISP) and carboxymethyl chitosan (CMCS) for loading AVM to obtain ISP/CMCS@AVM microspheres. The encapsulation efficiency (EE), sustained release property, ultraviolet (UV) protective ability, and toxicity of the microspheres were evaluated, and the release kinetics of AVM from the microsphere at different pHs were investigated. The results demonstrated that the average particle size of ISP/CMCS@AVM was 283.95 nm, and the EE reached 88.42% for AVM after denaturation. After 70 h of exposure to UV light, the residual rate of AVM in ISP/CMCS@AVM was 78.12%, which was significantly higher than 35.18% in the AVM emulsion. Moreover, the formulation imparted pH sensitivity and sustained-release property to AVM and was consistent with the Korsmeyer–Peppas model, controlled by Fick diffusion. Finally, the insecticidal toxicity of ISP/CMCS@AVM did not differ significantly from that of unmodified AVM. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48358.     

基于局部振动测试的约束子结构模型修正方法

针对大型复杂结构模型修正中待识别参数过多、修正效率低等问题,提出一种基于局部振动测试的约束子结构模型修正方法。首先,利用子结构部分的振动测试响应构造约束子结构,从而将子结构从整体结构中隔离出来,形成独立简单的结构,有效地隔绝整体结构对子结构的影响。然后,基于构造的约束子结构响应数据,直接对待修正的目标子结构进行模型修正。最后,以一个T形钢管焊接结构和某发射台骨架为例,对所提方法的有效性进行了验证分析。结果表明,该方法不仅能够减少待识别参数,简化修正过程,而且修正效率及精度也较高,为大型复杂结构的模型修正提供了一种新思路。     

基于汉语声母韵母发音模型的语音识别

每个汉字的发音都是由声母、韵母两部分构成的，声母部分发音时音短，信号变化剧烈；而韵母部分发音时间长、信号相对比较平稳。传统的孤立字识别方案是以线性预测系数作为语音模型系数，用动态时间弯折算法进行模式匹配，但它不完全适用于汉语的单音节识别。本文中利用语音信号相邻帧间LPC距离的变化进行声母、韵母分割，并根据声母、韵母的不同特性分别建立模式，提高了声母部分在整个音节模式中的比重，同时大幅度降低了模式的数据量，实验结果表明，汉语单音节的识别速度较传统的PLC/DTW算法提高一倍以上，识别正确率达到95%。     

高噪声环境下的语音识别

本文介绍多码本离散隐马尔可夫模型用于含噪声语音识别的研究成果.特定人识别系统对孤立数字的识别率,在低噪声环境下可达100%,在高噪声环境下(信噪比 SNR 低于-7 dB)达63.9%.     

工业废石膏在研制新型隔热材料中的应用

本文利用陶瓷厂的废石膏为主要原料,通过加入合适的添加剂,研制出性能优异的新型轻质隔热材料,废石膏的加入量可达４０ｗｔ％,开辟了工业废石膏再利用的又一新途径。     

羧甲基葡甘聚糖/大豆分离蛋白复合膜的制备及表征

以溶液共混法制备羧甲基葡甘聚糖/大豆分离蛋白复合物.正交实验确定了羧甲基葡甘聚糖与大豆分离蛋白质量比为1.5∶1、pH10、6 mL/100g干粉质量的三氯氧磷作用下,40℃水浴反应3 h,羧甲基葡甘聚糖与大豆分离蛋白有良好的相互作用,复合膜的力学性能、抗潮性能及阻气性能均有明显提高,其中拉伸强度较羧甲基葡甘聚糖提高了117.6%,吸湿增重较羧甲基葡甘聚糖下降了19.02%,透湿系数降至6.7 g/mm·h·Pa,用红外光谱、Tg测定表征了其结构.     

适用于海岛的独立供电电源规划设计

针对我国浙江省舟山嵊泗列岛中的第二大岛嵊山岛负荷特点,规划设计了独立的可再生能源多能互补供电系统,包括风能、太阳能、波浪能,以及储能蓄电池等。采用回归分析方法对海岛用电负荷进行预测,在此基础上搭建海岛多能互补的混合发电系统的基本框架和模型,通过按机组类型优化的电源规划模型寻找出合适的计算方法进行供电电源优化,基于线性规划的原则得出各可再生能源电源在供电系统中的容量分配比例,即优化的供电电源规划设计方案,具有经济、环保、可靠的特点。     

Replacement of Diesel Generator Sets in Isolated Communities with More Efficient Biomass Combustion Process

Electrical power supply to communities isolated from urban areas is typically complex and expensive. Their geographical situation and the lack of infrastructure and qualified workforce impede the provision of electricity. Many are the sources of energy available, but few are appropriate or sustainable. Combustion of diesel fuel is a good technical solution; however, it is neither economic nor environmentally tenable. This paper presents the advantages of using biomass as an energy source, along with its potential increase in efficiency when steam is generated in specific circumstances of temperature and pressure.     

地方煤矿隔爆设施安装方法探讨

通过对地方煤矿隔爆设施现状的深入了解，结合地方煤矿生产布局和开采条件等实际情况，阐述了适合地方煤矿的隔爆水袋和岩粉棚安装的基本要求、方法及特点。     

电缆故障引起的停电及高压电机绝缘击穿事故

对电缆故障引起局部停电及高压电机绝缘电击绝缘击穿的事故原因进行了分析,提出了解决这一问题的防范措施。