一种横向耦合改进型结构极窄带声表面波滤波器研究

该文采用波导法分析了横向耦合极窄带声表面波滤波器速度变化模式,并用多物理场COMSOL软件对横向耦合声表面波滤波器的中心耦合条结构和耦合距离的变化建模进行计算,并分析频响特性。采用石英晶体作为底衬,设计了频率为898.144 MHz,插入损耗约为6 dB的极窄带声表面波滤波器并进行验证。结果表明,中心耦合条开腔结构的声表面波滤波器的相对带宽达到7.2‰,与不开腔结构5.2‰相对带宽相比,提升了2‰。这说明横向耦合声表面波滤波器的中心耦合条结构变化,能改变极窄带声表面波滤波器的相对带宽。     

主客体胶束水凝胶的制备及对神经生长因子的包载

通过可逆加成-断裂链转移聚合(RAFT)反应制备了一种亲水性两嵌段聚合物——聚乙二醇/聚N-异丙基丙烯酰胺(PEG-PNIPAM),利用α-环糊精(α-CD)与其中PEG链段的选择性包合形成了一种独特的主客体胶束,这种胶束由于具备中空结构,可对亲水性药物起到很好的负载作用。其对神经生长因子的包载率为经典普朗尼克F127胶束的2倍。进一步利用主客体胶束为大分子交联剂制备丙烯酰胺水凝胶,可赋予水凝胶优异的力学性能,拉伸伸长率为化学交联对照组5倍,并且强度高于对照组2倍以上。循环拉伸测试表明,该水凝胶具有良好的应力耗散机制。     

Synthesis and Characterization of Disodium Hydrogen Phosphate Dodecahydrate-Lauric-Palmitic Acid Used for Indoor Energy Storage Floor Units

Organic and inorganic phase change materials(PCMs) are considered potential materials for thermal energy storage(TES) with different phase change characteristics. In this study, a novel organic-inorganic composite phase change material(PCM) called disodium hydrogen phosphate dodecahydrate-lauric-palmitic acid(D-LA-PACM) was prepared. Expanded graphite(EG) was selected as the support material, and the novel organic-inorganic form-stable PCM called D-LA-PAPCM/EG was prepared using the vacuum adsor...     

Characteristics of Nitric-Oxide Emissions from Traditional Flame and MILD Combustion Operating in a Laboratory-Scale Furnace

This study investigated the formation and emission characteristics of nitric oxide(NO) from flameless MILD(moderate or intensive low-oxygen dilution) combustion(MILDC) versus traditional visible-flame combustion(TC) in a 30-k W furnace. Both combustion processes were experimentally operated successively in the same furnace, burning natural gas at a fixed rate of 19 k W and the equivalence ratio of 0.86. Numerical simulations of TC and MILDC were carried out to explain their distinction in the me...     

低压计量箱节点温升监测装置的设计

针对低压计量箱中计量设备端子节点接触不良导致异常温升的问题,采用无源、非接触测温以及电力高速载波通信技术进行监测,结合节点的工作参数,对端子工作状态进行判定,从而实现故障的早期发现和处理,避免事故.装置采用RFID技术,应用测温标签实现端子温度的采集,使用ESP32模组实现现场的控制管理,采用HPLC通信模块实现数据的...     

浅析集群演播室TALLY系统的设计与实现

TALLY系统是演播室系统的一个重要组成部分,本文围绕着集群演播室TALLY系统如何满足集群多个演播室并发节目制作的需求,简单介绍了系统的组成、连接方式、软件配置及实现原理.     

RESEARCH ON SEEPAGE MONITORING MODEL OF EARTH-ROCK DAM

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Application of Discrete Lumped Kinetic Modeling on Vacuum Gas Oil Hydrocracking

The kinetic model of vacuum gas oil (VGO) hydrocracking based on discrete lumped approach was investigated, and some improvement was put forward at the same time in this article. A parallel reaction scheme to describe the conversion of VGO into products (gases, gasoline, and diesel) proposed by Orochko was used. The different experimental data were analyzed statistically and then the product distribution and kinetic parameters were simulated by available data. Furthermore, the kinetic parameters were correlated based on the feed property, reaction temperature, and catalyst activity. An optimization code in Matlab 2011b was written to fine-tune these parameters. The model had a favorable ability to predict the product distribution and there was a good agreement between the model predictions and experiment data. Hence, the kinetic parameters indeed had something to do with feed properties, reaction temperature and catalyst activity.     

液压缸有限元应力分析

提出了一种液压缸液压模型。通过计算和实验应力测试表明，该模型有限元分析方法是正确可行的。