后置拉结筋技术质量保证

采用框架柱后置拉结筋技术，避免了传统预埋拉结筋因混凝土施工时，由于振捣等原因而造成的预埋拉结筋位置不准确，不用为寻找拉结筋而剔凿混凝土，可以保证混凝土结构表面观感质量，做到文明施工方便墙体砌筑。     

Analysis and experiments of self-injection magnetron

Magnetrons are widely used in microwave-based industrial applications, which are rapidly developing. However, the coupling between their output frequency and power as well as their wideband spectra restricts their further application. In this work, the output frequency and power of a magnetron are decoupled by self-injection. Moreover, the spectral bandwidth is narrowed, and the phase noise is reduced for most loop phase values. In order to predict the frequency variation with loop phase and injection ratio, a theoretical model based on a circuit equivalent to the magnetron is developed. Furthermore,the developed model also shows that the self-injection magnetron is stabler than the free-running magnetron and that the magnetron's phase noise can be reduced significantly for most loop phase values. Experimental results confirm the conclusions obtained using the proposed model.     

CO2分子的屈曲

用分子动力学方法模拟了CO2线形分子在纵向压力作用下的屈曲,与连续介质弹性稳定理论得到的计算结果一致.     

房地产企业住宅商品房开发建设成本控制研究

随着我国现代经济政策的不断调整和社会结构的不断变革,对于房地产行业的宏观调控和人口结构控制都存在较大的限制性.随着人们生活水平的不断提高,对房地产的需求逐渐提升.在这个过程中,社会经济结构不断变化,房地产企业所建设的住宅商品房价格持续升高,也就使得整个房地产行业的利润居高不下.在目前的经济整体结构来看,房地产开发企业体...     

一种吡啶三唑修饰的香豆素类荧光探针对Cu2+的选择性识别

成功设计且合成了一个基于吡啶三唑修饰的香豆素席夫碱荧光探针CPTH。分别利用¹H NMR、¹³C NMR、FT-IR和LC/MS对其进行了表征。CPTH在溶液中发射出强烈的黄色荧光并对铜离子表现出快速、优良的选择响应性。同时,CPTH的灵敏度较高,其检出限低至2 μmol·L^-1。     

Modeling and experimental studies of a side band power re-injection locked magnetron

A side band power re-injection locked(SBPRIL) magnetron is presented in this paper. A tuning stub is placed between the external injection locked(EIL) magnetron and the circulator. Side band power of the EIL magnetron is reflected back to the magnetron. The reflected side band power is reused and pulled back to the central frequency. A phase-locking model is developed from circuit theory to explain the process of reuse of side band power in SBPRIL magnetron. Theoretical analysis proves that the side band power is pulled back to the central frequency of the SBPRIL magnetron, then the amplitude of the RF voltage increases and the phase noise performance is improved. Particle-in-cell(PIC) simulation of a 10-vane continuous wave(CW) magnetron model is presented. Computer simulation predicts that the frequency spectrum's peak of the SBPRIL magnetron has an increase of 3.25 d B compared with the free running magnetron. The phase noise performance at the side band offset reduces 12.05 d B for the SBPRIL magnetron. Besides, the SBPRIL magnetron experiment is presented. Experimental results show that the spectrum peak rises by 14.29% for SBPRIL magnetron compared with the free running magnetron. The phase noise reduces more than 25 d B at 45-k Hz offset compared with the free running magnetron.     

实时交通量的灰色马尔柯夫预测方法

灰色预测适合于原始数据序列按指数规律变化的问题,而马尔柯夫适用于预测随机波动大的动态过程．有机地结合两者构成灰色马尔柯夫预测方法,可发挥两者的优势,从而提高预测精度．该方法首先用GM（1,1）模型进行预测,而后对相对误差序列进行马尔柯夫预测,最后用该预测值修正GM（1,1）的预测结果,因而具有较高的预测精度．使用灰色马尔柯夫预测方法对苏州某交叉口实时交通量进行预测,预测结果优于单一灰色GM（1,1）预测．实验表明,灰色马尔柯夫预测方法用于交通量预测是有效可行的．     

极化电磁研磨装置的工艺参数及磁路计算

实验研究了极化电磁研磨装置的工艺参数,计算磁路和分析运动间隙的影响.结果表明,该装置结构简单、振动频率高,能够实现强力研磨.