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Yan Jiaan 《数学年刊B辑(英文版)》1982,3(3):285-292
In this note we improve two conditions given by Lepingle and Memin^[3,4] for the uniform integrability of exponential martingales,and given some conditions for their L^r-integrability. 相似文献
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1 Introduction Inrecentyears ,increasingattentionhasbeen paidtohigh peak powerall solid statepulsedblue greenlasersforsomeapplicationssuchasspectroscopy ,display ,opticaldatastorage ,underseacommunicationsandsoon .Suchlaserscanberealizedbyintracavityorexter… 相似文献
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Beam quality factor (M2) and far-field scattering angle of LD end-pump Nd : YVO4 laser were measured by slit-scanning method. The experimental results showed that the laser operated on a multi-mode state. The corresponding analytical treatments for slit-scanning method and M2 factor measurement also were presented in this paper. 相似文献
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Shengzhi Zhao Xingyu Zhang Qingpu Wang Jiaan Zheng Qidi Zhang Shujun Zhang Lianke Sun Huanchu Chen 《Optics & Laser Technology》2001,33(5)
Nd3+ : Ca4GdO(BO3)3, known as Nd : GdCOB, is a new self-frequency doubling laser crystal. Using Cr4+ : YAG as passive Q-switch, we have realized the Q-switched laser running at 0.53 μm with an Nd : GdCOB crystal. Meanwhile, the pulse width, the single pulse energy and the repetition rate under different small-signal transmission of Cr4+ : YAG and different pump conditions are measured and the numerical solutions of the coupling wave rate equations agree with the experimental results. 相似文献
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Poly(3-difluoroaminomethyl-3-methyl oxetane (DFAMO)/3-azidomethyl-3-methyl oxetane (AMMO)) (PDA) can be used as an energetic pre-polymer in the binder systems of solid propellants and polymer-bonded explosives (PBXs). The cationic solution polymerization affords PDA using butane diol (BDO) and boron trifluride etherate (TFBE) as initiator and catalyst, separately. Its molecular structure is characterized and thermal decomposition behavior is investigated by thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). The copolymer has good thermal stability and exhibits a three-step mass-loss process with the first two steps mainly belonging to the thermal decomposition of difluoroamino and azido groups, respectively. DSC method is performed to evaluate the compatibility of PDA with some energetic components and inert materials. More than half of the selected materials are compatible with PDA, which including cyclotrimethylenetrinitramine (RDX), 2,4,6-trinitrotoluene (TNT), 1,3,5-triamino-2,4,6-trinitrobenzene (TATB), pentaerythritol tetranitrate (PETN), ammonium perchlorate (AP), ammonium nitrate (AN), potassium nitrate (KNO3), aluminum powder (Al), aluminum oxide (Al2O3), 2-nitrodiphenylamine (NDPA) and 1,3-diethyl-1,3-diphenyl urea (C1). 相似文献
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Let D be a bounded C~3-domain in R~d and(a_(ij))be a bounded symmetric matrixdefined on D.Consider the symmetric form(u,v)=1/2∫_D a_(ij)(x)(u(x))/(x_i) (v(x))/(x_j)dx,u,v∈H~1(D).Under some assumptions it is shown that the diffusion process associated with the regularDirichlet space(,(H~1(D))on L~2(D)can be characterized as a unique solution of acertain stochastic differential equation. 相似文献
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A novel copolymer with naphthalimide pendant group was prepared, in which a tertiary amine acts as an electron donor and quenches the fluorescence of the 4‐amino‐1,8‐naphthalimide fluorophore via the photo‐induced electron transfer process. When a photoacid generator was added, fluorescence enhancement of the copolymer in the net film was induced, this would be applied to generate patterned fluorescent images. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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The Gaussian kernel operators on white noise functional spaces, including second quantization, Fourier-Mehler transform, scaling,
renormalization, etc. are studied by means of symbol calculus, and characterized by the intertwining relations with annihilation
and creation operators. The infinitesimal generators of the Gaussian kernel operators are second order white noise operators
of which the number operator and the Gross Laplacian are particular examples. 相似文献