氧化物－NaZSM－5催化剂的研究 Ⅱ．ZnO－NaZSM－5的催化性能

研究了不同ＺｎＯ负载量的ＺｎＯ－ＮａＺＳＭ－５催化剂对甲醇、乙醇和王丙胺转化反应的催化行为．与ＮａＺＳＭ－５和ＺｎＯ相比，ＺｎＯ－ＮａＺＳＭ－５系列催化剂具有更高的催化活性和独特的产物选择性．ＺｎＯ高度分散的样品在甲醇、乙醇和正丙胺转化反应中表现出更有效的酸－碱双功能催化作用．还讨论了酸－碱对中心Ｚｎ－Ｏ在这些催化反应中的作用．     

Application of the parametric for mulae for electromagnetic showers in unconverted γ/π~0 discrimination

In the LHC experiment, the neutral pions produced during jet fragmentation are the background sources for all physics channels with high-energy photons in their final state. In this paper, the application of the three-dimensional parametric formula for electromagnetic (EM) showers, which we developed in the Alpha Magnetic Spectrometer II experiment, is presented to distinguish the unconverted photons from the neutral pions. With the constructed electromagnetic calorimeter (ECAL) in a GEANT4 simulation, the parametric formulae were validated and the unconverted γπ⁰ discrimination was performed with the Toolkit for Multivariate Data Analysis (TMVA) package in ROOT for different transverse energies ranging from 15 GeV to 75 GeV, which is the most sensitive region for light Higgs (with mass ～120 GeV) searches with the channel H→γγ. With this discrimination method and the selected transverse energy region, we can reject π⁰ with the efficiency from ～40% (65--75 GeV) to ～90% (15--25 GeV) when keeping 90% γ efficiency.     

纳米Pt/MgO催化剂的表征和催化性能

"用浸渍法制备了Pt/MgO催化剂,采用X射线衍射、X射线光电子能谱、透射电子显微镜和程序升温表面反应等技术对反应前后的催化剂进行了表征．甲烷部分氧化制备合成气的反应被用来考察催化剂的催化活性和稳定性．TEM结果显示活性组分Pt粒子的尺寸小于10 nm,而载体MgO的晶粒大小在50~200 nm．在固定床微反应器上进行．在800 ℃时,Pt/MgO催化剂表现了非常高的POM催化活性和稳定性,甲烷转化率和合成气的选择性在120 h内保持稳定．活性组分Pt以金属状态存在于载体的表面上,其存在状态和分散状态都很     

国际空间站上的AMS 实验

 AMS 实验
阿尔法磁谱仪(Alpha Magnetic Spectrometer,简称AMS)是国际空间站(International Space Station,简称ISS)上唯一的大型高能粒子探测器,也是人类送入太空的第一个大型磁谱仪。AMS 实验是丁肇中教授领导的大型国际合作项目,其科学目标是寻找宇宙中的反物质、暗物质及精确测量宇宙线的成分和能谱。参加AMS 实验的科学工作者来自三大洲(美洲、欧洲、亚洲)的16 个国家(地区),共有60 个大学或研究机构,600 多人。     

ZnFe0.25Al1.75O4催化剂在苯酚催化湿式氧化中的活性和稳定性

利用溶胶-凝胶法制备了ZnFe0.25Al1.75O4尖晶石复合氧化物催化剂,并将其用于苯酚催化湿式氧化反应.结果表明,这种催化剂对苯酚降解有较好的催化活性和稳定性.连续反应5次后,苯酚转化率为100%,COD去除率为88.7%.反应过程中,铁离子的溶出量先增加后减小,最终的出水金属离子浓度很低.第5次反应后的出水铁离子浓度为2.15 mg/L,锌离子浓度为1.53 mg/L.     

氧化物－NaZSM－5催化剂的研究Ⅲ．ZrO_2－NaZSM－5催化剂的表征和催化性能

氧化物┐ＮａＺＳＭ┐５催化剂的研究Ⅲ．ＺｒＯ２┐ＮａＺＳＭ┐５催化剂的表征和催化性能杨民（大连铁道学院应用化学系，大连１１６０２８）徐柏庆（大连理工大学化工学院化学系，大连１１６０１２）关键词ＺＳＭ－５沸石，氧化锆，强相互作用，乙醇，正丙胺，催化转化...     

由类水滑石前驱体制备的CuZnAl复合氧化物催化剂催化湿氧化处理苯酚

The efficiency of several noble metals for catalytic wet oxidation (CWO) of various pollutants has been demonstrated[1,2]. However, the noble metals are expensive, affecting greatly the economics of the corresponding process.     

Mn掺杂对Ni/ZnO吸附剂脱硫性能的改进

合成了5%Ni/Mn-ZnO吸附剂体系, 并在固定床上考察了Mn的掺杂对该吸附剂的吸附脱硫性能的影响. 8%MnO掺杂的5%Ni/MnO-ZnO吸附剂抗烧结性能显著提高, 并且吸附剂的脱硫活性和再生活性均有较大提高, 三次再生后的脱硫率仍比一次再生的无Mn掺杂的5%Ni/ZnO吸附剂的脱硫率高出约4%. XRD表征显示掺杂后的吸附剂有ZnMnO3生成.     

Study of new boson W±1 in the Minimal Higgsless Model at the LHC

The Minimal Higgsless Model predicts the existence of new vector gauge boson W1^±, By the process PP →W1^±qq →W^±Z^0qq, Z^0→ 1^＋1^-, W^±→ qq （1=e,μ; q is hadronized to be jets）, we study the sensitivity of searching for this possible vector gauge boson in the level of generator events of signal and backgrounds, then give integrated luminosity required to discover 5σ signal as a function of W1^± mass. The generator for the signal PP → W1^±qq →W^±Z^0qq at tree level is developed with the Minimal Higgsless Model and then interfaced with PYTHIA for the patton showers and hadronization. The backgrounds are produced with MadGraph and PYTHIA.     

Three dimensional parametrization of electromagnetic shower in Alpha Magnetic Spectrometer Ⅱ ECAL

We develop an empirical formula to parameterize the 3-dimension