HPLC中火炸药组分的容量因子与流动相组成的关系

]本文从29种火炸药组分的数据详细讨论了两方程,lnk'=a+blnφ+cφ和lnk'=A+B+C,之间的关系。同时还讨论了用溶剂极性参数P'来代替上述两方程中的的可能性。结果发现,两方程不仅适用于二元溶剂系统,而且也适用于三元溶剂系统。     

二(正丁基)苝四酰二亚胺微纤的制备及其发光性质

在功能染料中,由于苝四酰二亚胺独特的光学及光物理性质,引起了人们广泛重视,但是制备一维苝四酰二亚胺结构尚是一种挑战。合成了二(正丁基)苝四酰二亚胺衍生物,通过对溶剂的选择,用自组装方法得到了其一维微纤结构,FESEM及TEM表明该微纤结构有1 ～2个微米宽,几百个微米长。XRD结果表明其内部结构高度有序。对其机理研究表明,苝四酰二亚胺核之间的π-π堆积和憎溶剂效应以及正丁基较小的空间位阻对微纤的形成起重要作用,由于微纤中苝四酰二亚胺分子的紧密堆积,引起苝四酰二亚胺核强烈的π-π相互作用使得苝四酰二亚胺激发态分子间电荷迁移作用增强,不论是其UV-Vis吸收光谱还是其发光光谱都有较大红移,其光学性能同相应的溶液比较有很大差别。苝四酰二亚胺在维度可控光电器件的应用方面提供了有益的实验数据,使其在光捕集系统、光电电池、场效应晶体管以及发光二级管的应用研究方面可能成为有前途的材料之一。     

右转常绿信号交叉口短右转车道通行能力研究

为了估算右转常绿信号交叉口短右转车道通行能力,应用概率论相关方法,将右转车辆到达直行、右转共用车道的情况分成右转车辆被直行车阻挡、右转车辆溢出后被直行车辆阻挡和没有被阻挡三种情况.提出前两种情况发生的概率模型及均值模型,第三种情况的概率及通行能力,以此为基础建立出短右转车道的通行能力计算模型.用福州市信号交叉口实测数据对模型进行标定,应用VISSIM仿真软件验证模型.结果表明,右转车道通行能力随着短右转车道长度的增加而增大,车道长度越长,通行能力增长的趋势越缓.模型能较好的反映短右转车道对右转车道通行能力影响的实际情况,可为短右转车道设置提供理论依据.     

Effective generation of optical quadruple frequency millimeter-wave based on fiber laser using injection rational harmonic mode-locked technique

A method to generate the optical quadruple frequency millimeter-wave with high power efficiency is pro- posed and demonstrated based on the combination of the injection 2nd-order rational harmonic mode- locked fiber ring laser technique and the fiber grating notch filter. In this approach, the fiber Bragg grating notch filter is inserted into the laser cavity to prevent the undesired optical carrier, so that the pump power can be converted to 2nd-order harmonic wave more efficiently. In our experiment, the power efficiency of optical quadruple frequency millimeter-wave （40 GHz） generation is ten folds of that of our previous method based only on the rational harmonic mode-locked technique.     

水下传感网络拓扑部署

水下传感网络在进行水下状态监控与数据探测的过程中,需要根据不同的对象有着相应拓扑要求,本文介绍在静态下的二维结构、三维结构及混合结构的部署及移动漂移情况下的部署结构,详细描述了当前研究中相关的部署特点,并详细阐述了各个拓扑部署结构的优缺点及部署场景。     

基于BP神经网络的急倾斜煤层耦合致裂方案优化

为准确优化急倾斜煤层顶煤耦合致裂方法,根据碱沟煤矿+495水平B1+2工作面开采技术条件,梳理制约顶煤冒放性的7个主要因素;构建了预测顶煤冒放性的BP神经网络模型,并对不同的耦合致裂方案效果进行了预测与分析。结果表明,随顶煤裂化率增加,顶煤冒放性逐步提高,当劣化率大于43%时,弱化后顶煤达到Ⅰ类冒放性标准。考虑经济和实施环境等,选定注水压力为5 MPa,炸药单耗为0.3 kg/m~3为最优方案参数。优化方案实施后,碱沟煤矿顶煤冒放性由第Ⅳ类向第Ⅰ类转化,顶煤冒放性与回采率大幅提升,为安全高效开采提供了理论依据。     

A novel NOLM structure with nonreciprocal phase shift bias for power fluctuation reduction of pulse trains

A novel nonlinear optical loop mirror (NOLM) with a nonreciprocal phase shift bias (NPSB), called power equalization NOLM (PE-NOLM), is proposed for reducing the power fluctuation of pulse trains. NPSB provides part of the nonreciprocal phase difference so that the required input power is reduced, and nonsymmetrical coupling ratio of coupler can adjust the transmission curve to improve the equalization range. It has been shown theoretically that compared with earlier PE-NOLM, about 1.6 dB of equalization power reduction and about 2.2 dB of equalization range enhancement could be achieved. Experiments have demonstrated that the output power fluctuation is reduced to less than 0.4 dB, while the required input peak power range is 4.5 dBm (15.6-20.1 dBm).     

The final limitation of receiver terminal performance with remotely pumped preamplifiers

In this paper, the performance of receiver terminals with remotely pumped preamplifiers (RPPAs) is analyzed by numerical simulation and experiment. Both simulation and experiment show that there is an optimal RPPA location and optimal pump power according to the highest performance. The amplified spontaneous Raman scattering (ASRS) self-oscillation caused by Rayleigh backscattering (RBS) and the lump reflector in transmission line are the final performance limitation.     

A novel control method for on-off gain and gain tilt of fiber Raman amplifiers

Considering spectrum tilt due to signal-to-signal Raman scattering (SSRS) in backward distributed fiber Raman amplifiers (B-DFRA),an inverse tilted on-off gain profile is adopted to achieve flat net gain.A simple approximate linear relationship of pump power at each wavelength versus on-off gain level and tilt was derived numerically and experimentally so that a novel control method was established.Since there are only 3 pre-determinable constants required for individual pump wave,it is easy to be realized.As an example,maximum errors less than 0.2 and 0.4 dB respectively for average gain and gain tilt were achieved over C+L band in 100-km back-pumped standard single-mode fiber (SMF) experimentally.