牙齿磷光检测技术研究

本文分析了牙齿磷光测量技术一直不能进一步发展的原因,提出了一种新的检测技术。这种技术利用光纤传输紫外光和磷光,利用光电接收器作为传感器,解决了牙齿磷光现象一直不能定量分析的问题,使得牙齿磷光现象与牙齿疾病之间关系的研究得到了进一步的发展。     

CONVERGENCE OF THE NONCONFORMING WILSON''''S BRICK FOR ARBITRARY HEXAHEDRAL MESHES

The nonconforming Wilson's brick classically is restricted to regular hexahedral meshes. Lesaint and Zlamal[6] relaxed this constraint for the two-dimensional analonue of this element In this paper we extend their results to three dimensions and prove that and where u is the exact solution, u_h is the approximate solution and is the usual norm for the Sobolev space H~1(?).     

Bound state solutions of d-dimensional Schrdinger equation with Eckart potential plus modified deformed Hylleraas potential

We study the d-dimensional Schrdinger equation for Eckart plus modified deformed Hylleraas potentials using the generalized parametric form of Nikiforov-Uvarov method.We obtain energy eigenvalues and the corresponding wave function expressed in terms of a Jacobi polynomial.We also discuss two special cases of this potential comprised of the Hulthen potential and the Rosen-Morse potential in three dimensions.Numerical results are also computed for the energy spectrum and the potentials.     

Influence of arsenic,antimony and cobalt impurities on the cathodic process in zinc electrowinning

By means of an electrochemical study,the influence of arsenic,antimony and cobalt on cathodic polarization in the zinc electrowinning process,the associated kinetic equations and parameters,and the polarization mechanism have been studied.The results show that the experimental values of the kinetic parameters are in accord with the theoretical values in the ZnSO4/H2SO4 solution with a single impurity is added.In contrast,the charge transfer coefficient α is smaller than the theoretical value in the ZnSO4/H2...     

Aminolysis of methoxy groups in pyrimidine derivatives. Activation by 5‐nitroso

The nucleophilic substitution of 2‐mefhoxy groups in pyrimidine derivatives was strongly activated by introduction of a 5‐nitroso group on to the pyrimidine ring. The aminolysis of several 2‐methoxy‐5‐nitrosopyrimidine derivatives was performed at room temperature in hydroxylic as well as in non‐hydroxylic media with different primary amines in short time and good yields. The aminolysed substrates include 6‐[(per‐O‐acetyl)glycosyl]aminopyrimidines which afforded the corresponding 2‐aminopyrimidines without harming the acetyl protecting groups of the sugar moiety.     

TEST BEAM STUDIES OF BES BARREL SHOWER COUNTER PROTOTYPE

The BES barrel shower counter prototype was tested with electron and pion beam in the momentum range from 0.2 to 2.0GeV/c at 12GeV PS test beam line of KEK, the preliminary results were reported. Four types of gas mixtures which were used in prototype have been tested: 40% Ar/60% Isobutane, 44.5% Ar/44.5%CH₄/11% Methylel, 47%Ar/47%%CH₄/6% Methylel, 49.3%Ar/49.3%CH₄/1.4% Ethyl alcohol. The results show that using SQS tube as sampling means in BES shower is feasible way for BEPC region.     

PHOTOCATALYTIC HYDROGEN EVOLUTION FROM WATER SPLITTING UNDER VISIBLE LIGHT IRRADIATION ON NOVEL PHOTOCATALYST FULLENES-PVP-ZN_(0.999)NI(0.001)S

1. INTRODUCTION1. INTRODUCTIONOne of the most widely discussed subjects these days is the energy crisis, i.e. the oil shortage and the oil price rising, which encouraged us to research and develop new green energy-hydrogen energy in the 21st century. Therefore, hydrogen produced from water splittingwith photocatalyst has been extensively studied from the viewpoint of photo energy, such as solar energy conversion to chemical and electricity energy, and environmental concerns. To date, …     

A note on transient thermometry with inert thermometers

Zusammenfassung Der Einfluss der Trägheit von Thermometern mit Wärmekapazität wird berechnet für den Fall zweier Thermometer im Kontakt mit einem langen Stab. Temperaturleitfähigkeit und die Lage von Wärmequellen können aus den Therniometerablesungen für kleine Zeitwerte erhalten werden.