理性看待特许经营

目前，国内许多企业为了在较短的时间内迅速扩大规模，纷纷采取特许经营模式，有些已经取得了较大的进展，但其中也不乏盲目跟刚才是，文章从国内特许经营存在的问题入手，指出了特许经营中的陷阱及对策。     

负载BaCeO3/γ-Al2O3催化剂的储氮和抗硫特性

用XRD、FT-IR等手段研究了钙钛矿型BaCeO3系列样品的晶相和氮氧化物吸收物种,并测定了它们的储氮量(NSC). 结果表明:加入贵金属反而使NSC降低. 而对于负载的BaCeO3/γ-Al2O3样品,加入贵金属后,NSC值提高了3倍以上,其顺序为Pt>Rh>Pt-Rh. 结果还表明,BaCeO3和Pt/BaCeO3样品在φ(SO2)<0.006 %时,仍具有较高的NSC值,而Pt/BaCeO3/γ-Al2O3样品不但具有很高的储氮能力而且具有更好的抗硫性能.     

网络购物陷阱分析

介绍了网上购物的流程以及网络购物过程中存在的诸多陷阱,并提出了一些解决问题的建议.     

海南岛西北部几处新发现的海滩岩及其意义

在海南岛新发现了三处海滩岩露头。本文从岩石学、沉积学和地球化学等方面探讨了它们的成岩环境,结合~(11)C测年分析,估算出琼西北沿海地区4000多年来的平均构造沉降量大于0.5mm/a。     

盐构造与油气圈闭及其综合利用

简单介绍了近年来盐构造学中发展起来的新概念和新术语，并初步总结它们与油气圈闭及其它矿产的关系。根据盐体与其上覆沉积层的接触关系，盐构造可分为整合型和非整合型二大类。     

广利油田沙四上亚段成藏地质特征与勘探方向

广利油田位于东营凹陷中央隆起带东端南翼,根据地质特征及测井剖面的综合分析,认为该区沙四上亚段发育了辫状河三角洲前缘沉积,辫状河道和前缘砂坝共同控制了辫状河三角洲前缘砂体的形态展布.辫状河道砂体和前缘砂坝砂体是广利油田的优质储层.广利油田西部的牛庄洼陷有沙三中、下亚段和沙四上亚段2套烃源岩,特别是沙四上亚段的油页岩可以为广利油田提供充足的油气.广利油田鼻状构造和辫状河三角洲前缘砂体的良好配置是油气聚集成藏的关键因素,鼻状背斜的西翼是广利油田下一步勘探的有利方向.     

One-dimensional non-nearest-neighbor random walks in the presence of traps

A one-dimensional lattice random walk in the presence ofm equally spaced traps is considered. The step length distribution is a symmetric exponential. An explicit analytic expression is obtained for the probability that the random walk will be trapped at thejth trapping site.     

X-ray excited fluorescence and phosphorescence of CaSO4: Sm phosphors

Calcium sulphate phosphors activated with samarium as an impurity with various percentage composition have been prepared and their fluorescence rise and phosphorescence decay behaviours have been studied. The growth curve is investigated to study the density of traps. The process of filling of traps during x-ray excitation is revealed. The decay curves are analysed to study the distribution of traps, the nature of decay and kinetics involved in the luminescence process. The concentration dependence of fluorescence emission of the phosphors is also discussed.     

Long-time asymptotics in the one-dimensional trapping problem with large bias

The survival probability of a particle which moves according to a biased random walk in a one-dimensional lattice containing randomly distributed deep traps is studied at large times. Exact asymptotic expansions are deduced for fields exceeding a certain threshold, using the method of images. In order to cover the whole range of fields, we also derive the behavior of the survival probability below this threshold, using the eigenvalue expansion method. The connection with the continuous diffusion model is discussed.     

Tests of quantum electrodynamics using ion traps

Experiments in ion traps on the g factors for the free and the bound electron in low-Z, hydrogen-like ions have provided the most accurate tests of quantum-electrodynamics calculations. Moreover they have been used to determine new and precise values for fundamental constants. Extensions to more stringent tests using ions of higher values of the nuclear charge Z are on the way. Also other QED tests such as Lamb shifts or hyperfine structures in H-like ions using traps will be feasible in the near future. The tests in bound systems, however, will be limited by nuclear structure effects which are difficult to calculate. Assuming the QED calculations as correct, the experimental results may be used to determine nuclear contributions and thus support nuclear models. Contribution presented at the TCP06, Vancouver Island, 2006.