分体型COIL谐振腔支撑致稳系统设计与仿真分析北大核心CSCD

采用工字型光学平台、调平支腿与钢丝绳弹簧进行有机组合,设计了一种分体型COIL光学谐振腔支撑致稳系统。首先建立了工字型光学平台的有限元分析模型,以提高系统的第一阶固有频率、最大化材料利用率为目标,开展结构优化分析与设计,并对光学平台优化设计结果进行了验证,结果表明,优化设计是有效的,提高了光学平台的第一阶固有频率,优化了材料的分布情况。进一步,建立了支撑减振致稳系统的动力学模型,对平台系统的减振致稳性能进行了评估,分析了钢丝绳弹簧大阻尼比特性对平台系统减振致稳性能的影响,结果表明,钢丝绳弹簧较大程度上提高了平台系统的减振致稳性能。     

平行共轴线圈的磁场特征研究与实验设计

通过计算机及相关的传感器和数据采集接口辅助,研究了平行共轴双线圈间距分别为0.5R,R,1.5R时,轴线方向磁场强度的分布规律及特征.从平行共轴双线圈间距为R的亥姆霍兹线圈所形成的均匀磁场出发,结合理论推导,自己设计并组装了三线圈实验装置,实现了平行共轴三线圈均匀磁场区域扩大、强度增强的实验设计,在一定程度上弥补了传统亥姆霍兹线圈磁场测量的不足并有助于对其深入的理解和研究.     

低功耗聚合物Mach-Zehnder热光开关

采用传统的半导体工艺制作了聚合物Mach-Zehnder型热光开关.利用扫描电镜观测波导形貌,通过红外摄像机观测波导的近场输出光斑,在通信波段1 550 nm波长下测试了器件的输出光谱.在电极上施加直流信号,测得热光开关的消光比为－15 dB,驱动功率为16 mW.引入直流偏置网络,获得了器件的开关特性曲线,经测量开关上升时间为1.2 ms,下降时间为0.8 ms.     

荧光标记微管的光敏断裂及机理

荧光标记的微管经激发光照射会引起微管的断裂，但其断裂过程及机理并不清楚.通过光镊研究了微管光敏断裂的动态过程.实验结果表明组成微管的原丝并不是同时断裂的，而是相继断裂最终导致微管的断裂.经过一系列生物学实验，确定了活性氧中的自由基是造成微管光敏断裂的主要因素.根据光镊研究的结果推测了自由基作用于微管的机理. 关键词： 光镊 微管 断裂 自由基     

Atomic structure and collision dynamics with highly charged ions

The research progresses on the investigations of atomic structure and collision dynamics with highly charged ions based on the heavy ion storage rings and electron ion beam traps in recent 20 years are reviewed. The structure part covers test of quantum electrodynamics and electron correlation in strong Coulomb field studied through dielectronic recombination spectroscopy and VUV/x-ray spectroscopy. The collision dynamics part includes charge exchange dynamics in ion-atom collisions mainly in Bohr velocity region, ion-induced fragmentation mechanisms of molecules, hydrogen-bound and van de Waals bound clusters, interference, and phase information observed in ion-atom/molecule collisions. With this achievements, two aspects of theoretical studies related to low energy and relativistic energy collisions are presented. The applications of data relevant to key atomic processes like dielectronic recombination and charge exchanges involving highly charged ions are discussed. At the end of this review, some future prospects of research related to highly charged ions are proposed.     

投稿须知

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Analysis of the generation mechanism of the S-shaped J—V curves of MoS2/Si-based solar cells

Amorphous-microcrystalline MoS$_{2}$ thin films are fabricated using the sol-gel method to produce MoS$_{2}$/Si-based solar cells. The generation mechanisms of the S-shaped current density-voltage ($J$-$V$) curves of the solar cells are analyzed. To improve the performance of the solar cells and address the problem of the S-shaped $J$-$V$ curve, a MoS$_{2}$ film and a p$^+$ layer are introduced into the front and back interfaces of the solar cell, respectively, which leads to the formation of a p-n junction between the p-Si and the MoS$_{2}$ film as well as ohmic contacts between the MoS$_{2}$ film and the ITO, improving the S-shaped $J$-$V$ curve. As a result of the high doping characteristics and the high work function of the p$^+$ layer, a high-low junction is formed between the p$^+$ and p layers along with ohmic contacts between the p$^+$ layer and the Ag electrode. Consequently, the S-shaped $J$-$V$ curve is eliminated, and a significantly higher current density is achieved at a high voltage. The device exhibits ideal p-n junction rectification characteristics and achieves a high power-conversion efficiency (CE) of 7.55%. The findings of this study may improve the application of MoS$_{2}$ thin films in silicon-based solar cells, which are expected to be widely used in various silicon-based electronic and optical devices.     

结构可靠性仿真方法研究简

可靠性仿真是对复杂结构系统进行可靠性分析计算最为有效的方法,引起了研究者越来越广泛的关注. 综合目前结构可靠性仿真方法研究现状,介绍了蒙特卡罗（Monte-Carlo,MC）法、极限状态方程重构法、随机有限元法（stochastic finite element method,SFEM）进行结构可靠性仿真计算的特点及发展现状,归纳了固体火箭发动机（solid rocket motor,SRM）结构可靠性的特点及当前进行仿真的方法;并在此基础上分析了目前结构可靠性仿真方法及对SRM 结构可靠性进行仿真分析计算时存在的不足及需要进一步研究的内容.     

超高效液相色谱-串联质谱联用法同步检测抗生素生产废水中螺旋霉素与新螺旋霉素残留

采用超高效液相色谱-串联质谱法同步测定了抗生素生产废水中残留的螺旋霉素(SPM-Ⅰ)和新螺旋霉素(NSPM-Ⅰ)。考察了萃取溶剂种类、水样pH值、萃取次数、水样与萃取溶剂的体积比等因素对目标物回收率的影响。以ACQUITY UPLC BEH C18(100 mm×2.1 mm i.d.,1.7 μm)为分析柱,0.1%甲酸水溶液和乙腈为流动相梯度淋洗,流速0.2 mL/min,电喷雾正离子多重反应监测模式检测。标准曲线在0.02~1.00 mg/L范围内线性关系良好,r2均大于0.999。方法回收率为70% ~ 88%,相对标准偏差小于10%,检出限(S/N=3)分别为0.03 μg/L(SPM-Ⅰ)和0.06 μg/L(NSPM-Ⅰ)。该方法应用于无锡市某制药厂抗生素生产废水中SPM-Ⅰ和NSPM-Ⅰ的检测,检出质量浓度分别为（115.6±2.7） mg/L和（5.3±0.4） mg/L。     

摘箬山海岛新能源电网设计关键技术

拟建设的浙江舟山地区摘箬山海岛电网供电容量大于5MW,主要采用海流能机组、风电机组、太阳能机组、以及混合储能系统供电,着重介绍摘箬山海岛电网设计中需要解决的若干关键技术,包括电网的负荷平衡方案、电网电气设计和电网集中控制策略等方案.