芳基硅烷、锗烷、锡烷的合成与表征

有机金属聚合物的研究近几年得到了很大的发展,含金属Ｓｉ、Ｇｅ、Ｓｎ的有机聚合物表现出特殊的导电性、非线性光学性等。我们合成了含Ｓｉ、Ｇｅ、Ｓｎ的有机金属聚合物的中间体芳基硅烷、锗烷、锡烷。合成路线如下:ａ:Ｒ=Ｍｅ,Ｍ=Ｓｉ;ｂ:Ｒ=Ｐｈ,Ｍ=Ｓｉ;ｃ:Ｒ=Ｐｈ,Ｍ=Ｇｅ;ｄ:Ｒ=Ｐｈ,Ｍ=Ｓｎ1　实验部分1 1　仪器和试剂原料均为化学纯,所有溶剂都经过严格的无水、无氧处理,所有反应均与Ｓｃｈｌｅｎｋ操作线连接;质谱:ＨＥＮＬＥＴＴＰＡＣＫＡＲＤＭＳ5989;1ＨＮＭＲ:ＢＲＵＫＥＲＡＣ80ＭＨｚ;熔点测量:ＬＥＩＴＺＢＩＯＭＥＤ…     

Resonant two-photon ionization with high-order continuum states

In this paper,the resonant two-photon ionization of atoms with high-order con-tinuum state is studied.It's found that the C-C coupling among the continuum states enhancesthe two-level atomic Rabi oscillation,and the direct transition from the intermidiate excitedstate to the continuum weakens the Rabi oscillation.Therefore the photoelectron energy spec-tra and the population are changed.     

FINITELY GENERATED COMMUTATIVE ARCHIMEDEAN SEMIGROUPS

In this work commutative Archimedean finitely generated semigroups are characterized in terms of ideal extensions.     

DRAG ON SUBMICRON NANOPARTICLE AGGREGATES

A new procedure was developed for estimating the effective collision diameter of an aggregate composed of primary particles of any size. The coagulation coefficient of two oppositely charged particles was measured experimentally and compared with classic Fuchs theory, including a new method to account for particle non-sphericity. A second set of experiments were performed on well-defined nanoparticle aggregates at different stages of sintering, i.e. from the aggregate to the fully sintered stage. Here, electrical mobility was used to characterize the particle drag. The aggregates are being built from two different size-fractionated nanoparticle aerosols, the non-aggregated particles are discarded by an electrofilter and then they are passed through a furnace at concentrations low enough not to induce coagulation.     

ON THE EXISTENCE OF POSITIVE ENTIRE SOLUTIONS FOR SINGULAR p-LAPLACE EQUATIONS

In this paper N-dimensional singular, p-Laplace equations of the following form are considered, where p ≥N, β > 0, and f : [0,∞)×(0,∞)×[0, ∞)→[0,∞) is a continuous function. Some sufficient conditions are obtained for the existence of infinitely many radially positive entire solutions of the equation which are asymptotic to positive constant multiples of |x|(p-N)/(p-1) for p > N or log|x| for N = p as |x|→∞.     

The PC—Based ATLAS Event Filter Prototype：Supervision Design,Implementation and Tests

The studies undertaken to prepare the Technical Design Report of the ATLAS 3^rd Level Trigger(Event Filter)are performed on different prototypes based on different technologies.we present here the most recent results obtained for the supervision of the prototype based on conventional,off-the-shelf PC machines and Java Moblie agent technology.     

MAXIMUM NORM ERROR ESTIMATES OF CROUZEIX-RAVIART NONCONFORMING FINITE ELEMENT APPROXIMATION OF NAVIER-STOKES PROBLEM

1. IntroductionThere are many research works on finite element approximation of Navier-Stokesproblem in the case of lower Reynold number, by using the so-called velocity--pressuremixed by Teman [26], the optimal results were also obtained. The other nonconforming finiteelement schemes for Navie--Stokes problem may be found in [4,8,9,14,15,23,26]. But sofar, maximum norm error estimates for any nonconforming finite element schemes werenot considered.Recently, the quasi--optimal maximum norm …     

MICROSTRUCTURAL CHARACTERIZATION OF SPIN—VALVE MULTILAYERS BY X—RAY ANOMALYOUS DIFFRACTION TECHNIQUE

It is impossible to directly analyze the microstructure of spin-valve multilayers based on Ni,F,Cu and Mn by a conventional X-ray diffraction technique because the lattice parameter and atomic sattering factor sof them are very close.To solve this problem, we use an x-ray anomalous diffraction technique to characterize the microstructures of the [Ni80Fe20/Fe50Mn50]15 and [Ni80Fe20/Cu]15 superlattice systems.The results show that more diffraction peaks and higher internsity in the reflectivety profile are observed when the incident energy is close to the absorption edge of the lighter element(Mn) in [Ni80Fe20/Fe50Mn50]15 multilayer systems and to the absorption edge of the heavier element (Cu) in the [Ni80Fe20/Cu]15 multilayer systems.The interface and periodic structure of [Ni80F20/Fe50Mn50]15 are more perfect than that of the [Ni80Fe20/Cu]15 superlattices.The above results are disussed in this paper.     

Study on mode-filtered light sensor for methane detection

A novel mode-filtered light gas sensor has been reported.It was constructed by inserting an optical fiber deposited by a thin silicone cladding of cryptophane A into a fused-silica capillary.When different concentration of methane gas was introduced to the sensor,the phenomenon that mode-filtered light intensity decreased with the increasing concentration of methane was observed. And a linear relationship was obtained within the methane concentration range of 0.0-16.0%(v/v).The detection limit was 0.06% ...