农村经济发展中生态农业建设与乡镇企业发展之间的关系

阐述了生态农业原理和基本内涵,论述了生态农业和乡镇企业之间的相互关系,提出了分析建议和对策.     

Computation of concentrations of characteristic atoms of alloys in BCC structure

In this paper,taking Nb-Mo alloy system as an example,the equations of concentration of characteristic atoms of alloys in BCC structure were obtained on the basis of the idea of systematic science of alloys and the number of coordination atoms.The concentrations of characteristic atoms in B2-NbMo type ordered alloys were calculated as functions of ordering degree(s) and composition xMo.When s=smax,the concentrations of characteristic atoms of stoichiometric B2-NbMo intermetallic compound are equal to that o...     

3C认证中需要补充的质量管理体系文件

阐述了在3C认证过程中，质量管理体系文件的补充如何既能满足ISO9000标准又能涵盖工厂质量保证能力要求。     

远程监测中多用户数据共享平台的设计与实现

在基于虚拟仪器的远程数据监测中,利用网络和数据库平台实现利用较少的数据源提供较多的实验者完成工作,是虚拟仪器实验网络应用中的系统创新。所阐述的共享平台将数据采集、共享和基于互联网的远程传输技术融为一体,从而实现多用户、多目标的并发数据采集和处理,实现了采用较少的设备实现较多用户的个性化虚拟实验环境。通过以一个典型的采用设置中间数据平台层的设计、虚拟化试验系统中的数据源和传输环节的解决方案而实现的远程多用户并发虚拟实验环境,详细阐述了基于LabVIEW的该类系统在现实过程中的信息共享机制设计与实现。     

Production of thick-walled hollow glass microspheres for inertial confinement fusion targets by sol-gel technology

To fabricate thick-walled hollow glass microspheres(HGMs)for inertial confinement fusion(ICF)targets by sol-gel technology,we investigated the effects of glass composition,blowing agent,refining temperature,pressure and composition of furnace atmosphere on the wall thickness of HGMs by numerical simulation and experiments.The results showed that the residence times of the thick-walled HGMs in the encapsulating and refining phases decreased with the increase of wall thickness of HGMs.As a response to this ch...     

Well-dispersed Palladium Nanoparticles Catalysts Prepared by Wood Nanomaterials for Suzuki Coupling Reaction

Herein, well-dispersed Palladium (Pd) nanoparticles (NPs) with good catalytic activities were prepared using a wood nanomaterial (WNM) as a reductant and a supporting agent. Various factors that influenced the NP morphologies, including reaction time, temperature, and precursor concentration were studied. The as-prepared Pd NPs/WNM showed good catalytic performance for Suzuki coupling reactions.     

Fabrication and characterization of novel bowknot-like CeO2 crystallites and applications for Methyl-orange Sensors

Bowknot-like CeO₂ bundles crystals were successfully prepared from a single precursor via a thermal decomposition route. The precursor was synthesized by a hydrothermal reaction using Ce(NO₃)₃ · 6H₂O with CO(NH₂)₂ at 150 °C in a water-glycerol complex solution. Glycerol plays a very important role for the formation of precursor bowknot-like structures. The morphology of the precursor was maintained during the heating process. The optical absorption spectrum indicates that the CeO₂ dendrites have a direct band gap of 3.42 eV, which is mostly larger than values of bulk powders due to the quantum size effect. The electrochemical characters of the CeO₂ bundles structures are studied by their investigation of cyclic voltammetry (CV). It was found that the CeO₂ bundles can greatly improve the electron transfer ability.     

Development of high-energy-density materials

The performance of an energetic compound is mainly decided by parameters such as density, oxygen balance, heat of formation,and stability. Among these properties, density is the most important factor because it determines the detonation pressure and velocity. One of the trends in the development of high-energy-density materials(HEDMs) involves the study of energetic materials with high nitrogen levels. A compound with high nitrogen content can obtain substantial energy from the heat of formation rather than from the intramolecular oxidation of carbon skeleton to release energy in the form of a nitro group or nitrate ester. In addition to excellent performance, the newly developed energetic materials should also possess high working power and insensitivity toward external influences for ensuring the safety of charge and service, high energy release rate, long service life,good compatibility, excellent biological performance, low toxicity, safe battlefield environment, and low moisture absorption,which meet the requirements of military and civilian use. This review summarizes the research progress on global HEDMs.TNAZ, FOX-7, octanitrocubanane, TAM, TKX-50, and N5 were believed to show promise in achieving application goals. The prospective vision of HEDMs containing ions, total nitrogen, metal hydrogen, and nuclear energetic isomers, overcoming technical barriers, synthesis of all-nitrogen materials, theoretical studies on desorption/adsorption system, and challenging technical problems that need to be solved for the safety of synthetic nitrogen compounds were discussed to further elucidate the effect of this subject.     

旋转叶片异步振动参数辨识方法及试验验证

基于叶尖定时原理和单自由度振动理论,利用全相位FFT(apFFT)和最小二乘法建立了叶片异步振动参数辨识算法,通过数值仿真验证了参数辨识算法的正确性,给出了传感器布置合理性的检验参数及经验值.采用高压氮气冲击叶片使叶片产生某一单频绝对占有的振动,在风扇转子试验器上开展了1 971 r/min、2 326 r/min两个异步转速下的振动参数辨识试验.结果表明:辨识方法均能准确辨识出叶片异步振动,且获得的不同叶片的振动频率完全相同;以叶片应变信号为基准,振动频率辨识误差最大为1.12％,频率辨识准确率高,验证了异步振动参数辨识方法的正确性.     

温芯盒法聚丙烯酸酯树脂砂的研究

研究了以聚丙烯酸酯树脂为粘结剂，温芯盒固化的树脂砂制芯新工艺；对芯砂的工艺性能和高温性能作了较系统的探讨，介绍了浇注情况。