SU(3)C×SU(2)I×U(1)Y Theory of Composite Leptons

Assuming Higgs Assuming coupling to be the only origin of parity non-conservation, an SU(3)_C×SU(2)_I×U(1)_Y theory of composite leptons is established in the Scheme of three generations and supersymmetry.     

SU(3)L×U(1)X Model and a New Candidate for Dark Matter

We consider a gauge model based on SU(3)_L×U(1)_X symmetry. In the model each lepton family contains a new neutral fermion (N-Particle). We calculate the lifetime of the N-particle and estimate the value of its mass. We show that the N-particle can act as dark matter particle.     

THE CHIRAL SU(2)L SU(2)R σ-MODEL WITH MASSIVE π MESONS

The chiral SU(2)_L SU(2)_R σ-Model with both spontaneous and dynamical symmetry breaking is investigated and massive π mesons are obtained.The physical mechanism of how π mesons acquire mass is discussed.     

可重整的SU(2)L×U(1)Y模型中的轴矢Ward恒等式和维数正规化

利用维数正规化方法, 通过到单圈的明显计算, 证明了包含重轻子的无Adler-Bell-Jackiw(ABJ)反常的SU(2)_L×U(1)_Y模型中的轴矢Ward恒等式的成立性是与γ₅的两个在n维中的定义无关的. 它的一个自然的推论是维数正规化方法适用于我们的有轴矢耦合费米子的模型. 当把AVV三角形嵌入到轴矢费米子顶角中时, 发现在n→4的物理极限下它并不会引起任何新的有限的反常, 从而至少到两圈的水平证明了Frampton有关存在新的与质量相关的反常的猜测在我们的非Abel情况下同样是不成立的.     

Nd∶KY(WO4)2和Nd∶KG(WO4)2晶体吸收光谱性能分析

通过研究分析钨酸盐晶体Nd∶KY(WO₄)₂和Nd∶KG(WO₄)₂在室温下的吸收光谱，发现这2种晶体具有作为激光晶体的优良特性。根据Judd-Ofelt理论和测试所得的吸收光谱及数据，用VC++编程计算出晶体的谱线强度、振子强度、吸收截面等，拟合得Nd³⁺离子的3个晶场调节参数Ω_λ(λ=2，4，6)的值，并从理论上计算了自发跃迁几率、能级寿命、荧光分支比和积分发射截面。从计算得出的荧光分支比β可以看出，Nd∶KY(WO₄)₂(β_1060nm=0.4380)和Nd∶KG(WO₄)₂(β_1060nm=0.4618)晶体荧光分支比都较大，计算了该晶体的X=Ω₄/Ω₆，并将其X值与其他晶体的X值加以比较，Nd∶KY(WO₄)₂和Nd∶KG(WO₄)₂均易于实现1.06μm激光输出，适合作为LD泵浦的钨酸盐晶体激光器。     

闪光灯泵浦的Nd:KGd(WO4)2激光器

报道了用闪光灯泵浦的掺钕的钨酸钆镓(Nd³⁺:KGd(WO₄)₂激光器.在重复频率1Hz,脉宽120μs的灯泵下,测量了不同透过率下激光输出能量,获得最大输出能量384mJ,斜率效率1.0%,外推阈值0.54J.在调Q运行时,Nd:KGW晶体的斜率效率为0.16%,最大输出能量46mJ.     

重离子辐照SiO2 的光致发光(英文)

基于荷能离子与固体相互作用特点 ,提出了一种新的制备光致发光材料的方法——高能重离子辐照 .用这种方法研究了SiO₂ 薄膜的光致发光特性 ,发现高能 84Kr和40Ar离子辐照可在注碳Si O₂ 薄膜样品中产生强的蓝-紫光发射带 ,掺杂碳增强了辐照样品的发光特性.     

Study of semileptonic decays Bs→Ds1(2536)lν and Bs→Ds2(2573) lν in the CQM model

Based on the assumption that D_s1(2536) and D_s2(2573) belong to T doublet (1⁺,2⁺), we calculate the semileptonic decays of B_s to D_s1(2536) and D_s2(2573) in terms of the Constituent Quark Meson (CQM) model. For B_s→D_s1(2536)+lν and B_s→D_s2(2573)+lν, the order of magnitude of the obtained branching ratios is 10^－3. Our numerical results of the semileptonic decays of B_s to D_s1(2536) and D_s2(2573) are large, which implies that two semileptonic decays should be seen     

U(6/20)超对称性的U(5)极限

本文讨论U(6/20)超对称性的U(5)极限, 先在数学上导出有关的约化公式, 接着在M=1情况下, 讨论了动力学对称性, 画出典型能谱, 然后就¹⁰³₄₄Ru₅₉核将理论与实验作了比较.     

(Fe0.03Ni0.97)8(Si0.79P0.21)3的等温状态方程研究

 采用固态高温烧结反应方法,成功合成出了陨硅镍铁石样品(Fe_0.03Ni_0.97)₈(Si_0.79P_0.21)₃。X射线衍射结果表明,合成样品的结构为R3'c,对应的晶胞参数为a=b=0.663 8(1) nm,c=3.789 2(2) nm,V=1.446 15(6) nm³。在室温下,对样品进行原位高压X射线衍射研究,实验最高压力达到21.3 GPa,随着压力的升高,晶胞体积逐渐减小,但并没有观察到结构相变。利用Birch-Murnaghan状态方程对体积与压力的关系进行拟合,获得常温常压下的体积V₀=1.441 4(24) nm³,体积模量K₀=220(7) GPa。晶轴与压力的关系利用Murnaghan状态方程拟合,获得a轴和c轴的模量分别为K_a=257(9)和K_c=165(4),c轴较a轴容易压缩。     

Laser Resistance of Ta2O5/SiO2 and ZrO2/SiO2 Optical Coatings under 2μm Femtosecond Pulsed Irradiation

Ta₂O₅/SiO₂ and ZrO₂/SiO₂ high reflecting (HR) coatings are prepared by ion beam sputtering and electron beam evaporation, respectively. The laser-induced damage thresholds (LIDTs) of these samples are investigated with 2 μm femtosecond pulse lasers (80 fs, 1 kHz). It is found that the Ta₂O₅/SiO₂ HR coating has a higher capability of laser damage resistance than the ZrO₂/SiO₂ HR coating in the 2 μm femtosecond regime. The scanning electron microscope results show that the damage sites of the ZrO₂/SiO₂ HR coating have a relatively porous structure, the loose structure of coatings will provide more sites for water molecules, and the LIDTs of HR coatings will be reduced as a result of the strong water absorption at the wavelength of 2 μm.     

KH2PO4和(CH3NHCH2COOH)CaCl2在高压下的状态方程与相变

 在活塞圆筒式p-V关系测量装置上，研究了KH₂PO₄（KDP）和(CH₃NHCH₂COOH)CaCl₂［Tris-sarcosine calcium chloride（TSCC）］在室温下、4.5 GPa内的p-V关系。实验结果表明：KDP在2.1 GPa左右有一个相变；TSCC在0.8 GPa和3.2 GPa左右各有一个相变。本工作还给出了它们在相变前后的状态方程，以及它们的格临爱森参数γ₀、体积模量B₀和B₀的压力导数B₀'。     

LaF5(51)试制小结

L_aF₅光学玻璃,N_D=1.78427,N_F-N_c=0.01787,V_D=43.89,具有高折射率,低色散,化学稳定性较好等优越光学性能。它对于高级光学系统用来扩大相对孔径,提高成像质量,简化镜头设计等方面,都极为重要。它是光学设计所急需的新品种光学玻璃牌号之一。     

ZF13(51)试制小结

ZF₁₃光学璃玻,N_D=1.78446、N_F-N_c=0.03046,v_D=25.75,具有高折射率、高色散的优越光学性能。它是光学设计上迫切需要的一个牌号。     

U(2)L×U(2)R介子手征理论中对衰变ρ→ππ的重求和研究

把U(2)_L×U(2)_R介子手征理论中对矢量介子的O(p⁴)计算用重求和方法进行了改进,并重新研究了衰变ρ→ππ.由此得到了f_ρππ(p²)直到O(p^∞)的完整表达式,并基于收敛性条件和么正性条件给出了一个重要的非微扰结论.     

Study for Superdeformed Bands in A～190 Region with Quantum Group Uqp(u2) Model

superdeformed bands in the A～190 region are systematically analyzed by using the twoparameter expansion of quantum group U_qp(u₂) Model. The calculated results of E2 transition γ ray energies are in agreement with experimental data. According to three different methods for the spin assignment of rotational bands, the spin values of the band head I₀ of the yrast SD bands in ¹⁹⁴Hg(1) and ¹⁹⁴Pb(1) are assigned. Furthermore, the physical meaning of the nuclear softness is discussed, and these nuclear softness values of a signature partner are almost equal.     

Eu-Gd区域的破缺U(3)限U(6/12)模型

本文从超对称性破缺的角度讨论了位于典型U(3)限区域的奇A核₆₃Eu^₁₅₃, 在能谱和B(E2)方面得到了一些定量符合的结果.     

电子束脱除SO2和NOx的概述

综述了电子束脱硫脱氮的原理、特点和发展．中国成都电厂的电子束脱硫脱氮装置的运行，标志着我国工业应用阶段的开始.Removal SO 2 and NO x by electron beam is reviewed. Its basic procedure is described. The electron beam method has many advantages compared to chemical one. The first industrial facility in China has been built in Chengdu Electric Power Plant and it is ruming successfully.     

SU(2)×U(1)×S3模型及类K0-K0系统的混合和CP破坏效应

本文内容包括:(ⅰ)进一步给出SU(2)×U(1)×S₃模型的结果S₂≈S₃≈(m_s²)/(m_b²);sin δ≤(m_um_d)/(m_cm_s),并预言b夸克的主要衰变道是b→u+W,b夸克的寿命可能长到10^-9秒.(ⅱ)给出类K⁰-K⁰系统混合时的精确表达式ρ=错号事例数/对号事例数=(1/2)(|p/q|²+|q/p|²)([Γ²+(Δm)²]²-(γ1γ2)²)/([Γ²+(Δm)²]²+(γ1γ2)²);并给出CP破坏的精确表达式:A=(1-ρ')/(1+ρ')=(I_M12Γ₁₂^*)/(|M₁₂|²+1/4|Γ₁₂|²),这里ρ′=(负电错号事例数)/(正电错号事例数)。     

Comprehensive analysis of e+e-→γηc(2S)

We discuss the production of η_c(2S) through the process e⁺e^-→γη_c(2S), where the leading contribution originates from 1-loop electroweak corrections. Adopting some reasonable light-cone distribution amplitudes, we analyze the cross section of this process. As the electron-positron center of mass energy √s=3770 MeV, the typical production cross section of this process is about 1 fb.