MPT－X磁偏滤器位形的数值计算

ＭＰＴ－Ｘ是带４个内导体坏的托卡马克装置。本文用差分法计算了ＭＰＴ－Ｘ磁偏滤器的平衡磁面位形。结果表明，迭加上各种强度的八极场都能形成磁偏滤器位形，形成电流的放电中心区域随八极场的增加而收缩。还模拟了从多极器运行模式向托卡马克的过渡。     

铽铕-水杨基羟肟酸配合物的合成及发光性质

应用光谱技术研究铽及铕与水杨基羟肟酸所形成的配合物的发光性能,并探讨配合物的形成,以及溶剂、pH值及稀土含量对发光强度和能量传递的影响。     

各向异性渗流条件下弹性波的传播特征

研究了弹性波在非均匀裂纹孔隙介质中的传播特性,建立了各向异性喷射流模型.当弹性波通过裂纹孔隙介质时,由于波的扰动及裂纹和孔隙几何结构的不一致,导致在裂纹内部及裂纹与周边孔隙之间同时存在着流体压力梯度.此时的弹性波波动响应中包含着裂纹内连通性特征和背景孔隙渗透率信息.流体的动态流动过程使得介质的等效弹性参数为复数(非完全弹性),并且具有频率依赖性.当弹性波为低频和高频极限时,介质为完全弹性;当处于中间频段时,波有衰减和频率依赖.裂纹孔隙介质的各向异性连通性(渗透率)对应着各向异性特征频率(当渗流长度等于非均匀尺度时的弹性波频率),波的传播受到裂纹内连通性的影响.在一定频段内,随着裂纹厚度的增加,将出现第二峰值,峰值大小同时受到裂纹厚度和半径的影响.     

氢化氧化铝的同位素效应研究

在B3LYP/6-311++G(d,p)水平上预测了Al2O3H3分子的较低能量构型.其基态构型具有C s对称性,电子态为1A′.通过研究Al2O3M3和M2(M=H,D,T)的能量E、定容热容C V和熵S,用电子振动近似讨论了Al2O3+3/2M2→Al2O3M3反应的氢同位素效应,得到了Al2O3氢化的热力学函数?H0,?S0,?G0,及平衡压力与温度的关系.研究表明,氧化物Al2O3吸附氢(氘,氚)反应的同位素排代效应顺序为氚排代氘,氘排代氢,与钛等金属的同位素排代顺序相反.但排代效应都非常弱,且随着温度的增加趋于消失.     

仲胺修饰聚硅氧烷调控的一锅法Cu（I）催化多组分点击反应

在仲胺修饰聚硅氧烷的调控下，Cu（I）可在温和的条件下催化炔、叠氮化钠以及有机溴化合物的点击反应，收率较高，反应底物有比较广的适用性，不同的底物可以中等到较高的收率得到对应产物。     

不定型高温耐磨衬里材料的制备及应用

不定型高温耐磨衬里材料主要是针对火电、冶金、化工等行业物料输送、通风、除尘等系统设备进行内衬保护和修复而设计的。该产品采用三元复合胶结料，以刚玉为骨、粉料，并引入一定的纤维材料和少量的超微粉料及其它添加剂，使产品在相当宽的温度范围内具有很高的抗折强度和耐压强度．热震稳定性和耐磨性能优异。     

两个不同江豚群体ISSR遗传多样性初步分析

采用ISSR分子标记对中国水域隶属于不同江豚（Neophocaena phocaenoides）亚种的两个群体即长江群体和渤海群体的遗传多样性进行分析。用19条ISSR引物及3对引物组合对两个群体共36个样品的基因组DNA进行PCR扩增,共得到115个清晰的扩增位点,其中多态性位点48个,多态位点百分率（PPL）为41．71％。POPGENE分析结果表明：两个江豚群体的总体遗传多样性水平相对较低（He=0．1643;Ho=0．2413）;长江群体的遗传多样性水平（He=0．1530;Ho=0．2223）稍高于渤海群体（He=0．1402;Ho=0．2059）。Nei＇s遗传多样性分析结果表明群体结构水平较低而基因流水平较高（Gst=0．1049;Nm=4．2676）,提示在历史上可能发生过较强的基因交流。我们建议在保护上将两个群体划分为不同的管理单元。     

Generation of few-cycle laser pulses:Comparison between atomic and molecular gases in a hollow-core fiber

We numerically study the pulse compression approaches based on atomic or molecular gases in a hollow-core fiber.From the perspective of self-phase modulation(SPM), we give the extensive study of the SPM influence on a probe pulse with molecular phase modulation(MPM) effect. By comparing the two compression methods, we summarize their advantages and drawbacks to obtain the few-cycle pulses with micro- or millijoule energies. It is also shown that the double pump-probe approach can be used as a tunable dual-color source by adjusting the time delay between pump and probe pulses to proper values.     

Field-free molecular orientation enhanced by tuning the intensity ratio of a three-color laser field

We theoretically study the field-free molecular orientation induced by a three-color laser field. The three-color laser field with a large asymmetric degree can effectively enhance the molecular orientation. In particular, when the intensity ratio of the three-color laser field is tuned to a proper value of I_3: I_2: I_1= 0.09 : 0.5 : 1, the molecular orientation can be improved by ～ 20% compared with that of the two-color laser field at intensity ratio I_2: I_1= 1 : 1 for the same total laser intensity of 2×10~(13)W/cm~2. Moreover, we investigate the effect of the carrier-envelope phase(CEP) on the molecular orientation and use the asymmetric degree of the laser field to explain the result. We also show the influences of the laser intensity, rotational temperature, and pulse duration on the molecular orientation. These results are meaningful for the theoretical and experimental studies on the molecular orientation.     

Self-compression of 1.8-μm pulses in gas-filled hollow-core fibers

We numerically study the self-compression of the optical pulses centered at 1.8-μm in a hollow-core fiber(HCF) filled with argon. It is found that the pulse can be self-compressed to 2 optical cycles when the input pulse energy is 0.2-m J and the gas pressure is 500-mbar(1 bar = 10~5 Pa). Inducing a proper positive chirp into the input pulse can lead to a shorter temporal duration after self-compression. These results will benefit the generation of energetic few-cycle mid-infrared pulses.