Research of technique for synthesizing carbonyl diethyl malonate

Diethyl malonate being an initial raw material,processed with chlorination-replacement-desalination-vacuum rectification,is used to produce carbonyl diethyl malonate.An experiment for optimization determines that the best reaction condition was:① reaction for 7 h at 10 ℃ with mole-ratio being 2.4︰1 between chloride and raw material(diethyl malonate);② reaction for 4.5 h at 118 ℃ with mole-ratio being 1.2︰1 between the anhydrous sodium acetate and intermediate Ⅰ.The final product carbonyl diethyl malonate recovery ratio reaches up to as high as 79.12% with a purity of 96.4%,which meets the market requirement.This synthesis technique has the advantages of simple process,moderate reaction conditions,high yield and low cost,being suitable for industrial scale production.     

Exploring non-equilibrium statistical ensembles

Since Gibbs synthesized a general equilibrium statistical ensemble theory, generalizing the Gibbsian theory to non-equilibrium phenomena has been a dream for some theorists. However, the status of the theory for the non-equilibrium ensemble formalism is not as well established as the Gibbsian ensemble theory. In this work, we explore the formalism behind the non-equilibrium statistical ensemble theory based on the sub-dynamic kinetic equation originating from the Brussels-Austin school and develop...     

基于LabView的桥梁阴极保护监控系统研究与设计

设计了一种基于Labview的桥梁安全的阴极防腐保护监控平台,详细论述了该平台的系统结构、硬件、软件设计和通讯方式的应用设计。通过现场采集数据的网络化传输实现了远程数据采集、实时数据显示、分析和数据管理。本平台可以广泛应用于桥墩的防腐保护系统、大坝、输油管道、深海隧道等场合的远程健康状态监测。提高工程的使用安全和使用寿命,并能及时监测异常状态,为工程的运行提供了安全保障。     

PEMFC中液态水沿程分布的机理研究

通过分析流道和扩散层中的压力损失,并根据理想气体状态方程,得出了沿流道方向气体总压力以及水蒸气分压力沿程分布的表达式.根据液滴生成的机理分析,得出了PEMFC阴、阳两极扩散层中液态水沿程分布的表达式.结果表明:阳极中一般很难有水生成;阴极中加湿度越大,进口压力越大,过量系数越小,液体出现的位置离进口越近,且同一位置液态水的生成速率越大,当阴极气体完全加湿时,液态水的生成速率仅与其到进口的距离、电流密度、膜中水传输系数以及流道的宽度有关,而受流道的高度、过量系数、进口压力以及温度等影响较小.     

基于BSC的我国大中型化工企业综合竞争力评价

化工是一个国家基础性产业之一。加强化工企业运营管理,提升化工企业竞争力在国内外有许多成功经验。基于BSC(平衡记分卡)的我国大中型化工企业综合竞争力评价方法通过确定企业发展愿景,构建企业发展战略、设计评价指标以及求指标权重等多维度提升企业核心竞争力,可以将其作为企业战略管理体系的重要部分,同时也为我国化工企业提高核心竞争力指明了方向。     

三元层状氮化物Ti_4AlN_3的抗腐蚀性能

研究了以热压烧结合成的Ti_4AlN_3块体材料在浓和稀HCl,HNO_3以及NaOH中浸泡100 d的腐蚀行为。结果表明,Ti_4AlN_3在HCl中主要表现为孔蚀和晶间腐蚀,且在浓HCl中的失重要大于稀HCl;由失重曲线可见Ti_4AlN_2在浓HNO_3中失重最大,为11.73 mg/cm~2,由腐蚀面SEM照片可见较严重的全面腐蚀和剥蚀,XRD图谱显示一部分Ti_4AlN_3由于失去Al层从而转变为在酸碱中更为稳定的TiN。在酸溶液中,Ti_4AlN_3晶体的Ti-Al,Ti-Ti和Al-Al键发生断裂,Ti,Al原子溶解在溶液中。Ti_4AlN_3在NaOH中几乎没有失重,表现出良好的耐碱性能。     

乡镇域测土施肥分区创新实验设计与应用

结合当前正在全国进行的测土配方施肥项目,针对大学生创新能力培养,设计并实施了乡镇级测土施肥分区创新实验。实验引导学生综合应用G IS和GPS技术,土壤学、植物营养学和作物施肥等专业知识,面向乡镇、面向作物,为农户提供具体作物的施肥指导。通过实验,提高了学生服务"三农"的意识,锻炼了学生应用交叉学科知识、理论联系实际的学风,培养了学生的创新思维的能力。     

Automatic Measurement of LED Colorimetric Parameters Based on LabVIEW

In order to accurately and automatically measure the light emitting diode ( LED ) colorimetric parameters,the design of a measurement system by adopting a high-performance spectrometer and looking-up t...     

Research on Multi-stage Optimum Design Technology for Virtual Supply Chain Based on Cybermediary in Manufacturing Industry

Virtual supply chain based on cybermediary (VSC-CM)is an innovative VSC pattern meeting informationization development requirements in the manufacturing industry.Methods and features of customer-demand-oriented optimum VSC design adopted by CM are discussed.A customer demand goal system applying to VSC-CM design and quantifying methods of these goals are accordingly given.Then a three-stage optimum VSC design scheme based on dynamic goals is designed,which considers both the holistic optimization of VSC and individuation demands of member enterprises.To implement the scheme,an optimum algorithm synthesizing fuzzy c-means clustering algorithm and topsis comprchensive evaluation algorithm is presented.Feasibility and rapidity of this scheme is proved through a case analysis finally.     

资产未来收益率的分段指数光滑预测

提出了一种改进指数光滑模型——分段指数光滑模型,并用此模型对资产的未来收益率进行预测,实证发现此预测方法比移动平均预测有更好的效果.