对做好奥运火炬传递无线电管理工作的几点思考

0前言北京奥运火炬传递的无线电频率保障任务责任大、任务重、时间紧,对无线电管理工作者提出了很高的要求。笔者全面参与了北京奥运火炬武汉市接力的无线电通信保障工作,以下向读者介绍湖北省在奥运火炬传递中的无线电管理工作,并分析、总结无线电保障经验。     

K0 Condensation in Hyperonic Neutron Star Matter

In the framework of the relativistic mean field theory, we investigate K^0 condensation along with K^- condensation in neutron star matter including the baryon octet. The results show that both K^0 and K^- condensations can occur well in the core of the maximum mass stars for relatively shallow optical potentials of K^- in the range of-100 MeV～ -160 MeV. With the increasing optical potential of K^-, the critical densities of K^- decrease and the species of baryons appearing in neutron stars become fewer. The main role of K^0 condensation is to make the abundances of particles become identical leading to isospin saturated symmetric matter including antikaons, nucleons and hyperons. K^- condensation is chiefly responsible for the softening of the corresponding equation of state, which leads to a large reduction in the maximum masses of neutron stars. In the core of massive neutron stars, neutron star matter including rich particle species, such as antikaons, nucleons and hyperons, may exist.     

A New Desirable Molecular Species for Stark Deceleration

We demonstrate a new molecular sample （CH radical） for Stark deceleration by Monte Carlo simulation, study the dependences of the decelerating effect on the different phase angles, stage number and decelerating voltages, and obtain some new optimized conditions and parameters. We also calculate the Stark energy shift of different quantum states of CH radical in the Stark decelerator electrostatic field and their populations in a supersonic CH molecular beam. Our study shows that the mean velocity of the supersonic CH molecular beam in the 2^∏1/2 state can be decelerated from 380 m/s to 24 m/s, and the corresponding translation temperature is lowered from 2.8 K to 27mK. It is thus clear that the CH radical is a new and desirable candidate for Stark deceleration.     

Synthesis and Structural Characterization of [Cu(DMF)_6][(η~5-C_5Me_5)WS_3(CuBr)_3]_2·Et_2O

1 INTRODUCTION In the last decade, we have been interested in the synthesis of [PPh4][(h5-C5Me5)MS3] (M = Mo, W)[1, 2] , Whose organometallic trisulfido anions show high reactivity towards various transition metals[3~6] . We once reported that the reaction of [PPh4][(h5-C5Me5)WS3] with CuBr in CH3CN afforded a double incomplete-cubane cluster [PPh4]2[(h5-C5Me5)WS3(CuBr)3]2[3], while the analogous reaction of [PPh4][(h5-C5Me5)WS3] with CuBr in CHCl3 gave rise to a 揻our-…     

集成原子光学及其原子芯片

随着原子激光冷却、囚禁与操控技术以及微米、纳米微电子制作技术的快速发展与不断完善,一个新兴的原子光学分支学科一“集成原子光学及其原子芯片”正在形成。本文重点介绍了集成原子光学及其原子芯片的集成方案、实验结果及其最新进展：包括表面微结构原子光学元器件、微磁结构集成原子光学、微光结构集成原子光学和微磁光结构集成原子光学及其原子芯片的设计方案与微制作技术及其最新实验结果。最后,简单总结了原子芯片的设计原则,讨论了芯片设计与研制中尚待解决的问题,并就集成原子光学的潜在应用及其未来发展作一简单展望。     

刚体转动方程的矢量式

就刚体动力学中角动量公式和转动方程进行了分析, 指出转动惯量张量不是常量, 得到了相关的矢量 式, 并分析了一些对公式L=J ω 和M =J β的常见误解     

介孔碳负载铂催化剂的分散性和电催化活性

以介孔硅SBA-15为模板, 糠醇为碳源制备了高度有序的介孔碳(CMK-5), 并用微波法合成碳负载的铂纳米粒子的催化剂. 为改善铂微粒的分散性能, 在微波碳载过程中添加了适量的阳离子表面活性剂(CTAB). XRD和TEM测试结果表明, CTAB的加入改善了铂催化剂的分散性, 且使铂微粒的平均粒径降至2.9 nm左右. 循环伏安测试结果显示, 加入CTAB后所得Pt/CMK-5催化剂的电化学活性面积大于未加CTAB的以及商业Johnson Matthey公司的Pt/C催化剂的活性面积.     

Synthesis of 1-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones

l-Benzoyl-3-aryl-4-hydroxy-4-phenylimidazolidin-2-thiones can be synthesized readily from the cyclization of 1-benzoyl-3-arylthioureas with bromine-acetophenone in the presence of excess triethylamiqe.     

咸宁市饮食从业人员乙型肝炎检测结果的分析

以饮食从业人员为检测对象.每人静脉采血5 mL,分离血清,应用ELISA方法进行检测.共检1 640人,HBsAg阳性96人,阳性率为5.85%(96/1640),其中HBsAg阳性血清进一步做HBeAg、抗-HBe、抗-HBc检测,阳性率分别为7.29%(7/96)、67.7%(65/96)、91.6%(88/96).其中男性722人,阳性62名,阳性率为8.59%(62/722),女性918人,阳性34名,阳性率为3.70%.HBsAg阳性率5.85%低于全国平均水平的8.08%.男性阳性率8.59%略低于我国1992年调查的11.3%,女性阳性率3.70%则明显低于我国同期调查的女性HBsAg阳性率8.23%.     

Sr-Y-Cu-O体系的超导电性

制备了名义组分为Sr_xY_(1-x)CuO_3(0.050相似文献