Temperature-Dependent Imaginary Part of the Off-Shell Nucleon Self-Energy and the Second Order Correction of Real Part of the Nucleon Self-Energy

The imaginary part of the off-shell nucleon self-energy at finite temperature in nuclear matter, where the polarization and correlation contributions of exchanges of the meson are taken into account, is investigated based on Walecka's meson-nucleon model and thermofield dynamics. The second order correction of temperature-dependent real part of the nucleon self-energy is calculated in terms of the dispersion relation. The Schrodinger equivalent potential of relativistic microscopic optical potential of a nucleon at finite temperature in nuclear medium is also studied.     

联立方程组新解法测定小儿退烧片的含量

本文采用联立方程组新解法,不经提取分离,直接测定小儿退烧片中阿斯匹林和扑热息痛的含量。阿斯匹林和扑热息痛的平均回收率和变异系数分别为９９．９５％,１．７４％和１００．１％,０．９３％（ｎ＝１０）,方法简便、快速、准确。     

SCINTILLATION COUNTER ARRAY LOCALIZATION SYSTEM

A scintillation counter array localization system, i.e, scintillation counter hodoscope, was studied and made for selecting events and triggering the streamer chamber in 1980. With this facility the penetrating position of the charged particles can be determined and it can be used as a trigger counter too. As soon as the charged particles penetrated this array and other scintillation telescope, the generated coincidence signal triggers the control system of the streamer chamber with the time delay 74 ns.On the other hand, this system also has a ability of selecting charged particle number penetrating the counter array, thus, the streamer chamber is able to record the event with certain multiplicity.This hodoscope contains a 8×8 scintillation counter array. Each plastic scintillator (type ST401) has the dimensions of 40×5×0.6 cm³ and the type of photomultipliers used is GDB50. The array area is 40×40 cm².The fast electronics and data handling system were made by ourselves. The whole system works well during the test with the on-line microcomputer TRS-80 and is not expensive.     

IRREDUCIBLE REPRESENTATIONS OF THE GRADED LIE ALGEBRA SU(m/n)

Using the definition of irreducible tensor operators of the Lie group SU(n), we ive a method of calculating the irreducible representations of the graded Lie algebra U(m/n). We also give some simple examples of irreducible representations of U(3/2) and SU(m/n).     

THE MOMENTUM SELECTOR OF BIG CLOUD CHAMBER SET

Using a“preselection-register-operation for reselection”program,a selection systemof the Yunan big cloud chamber set used for cosmic ray reseach is projected andconstructed.A small on-line digital computation technigue is applied to the momentumselector of the system,and a special computation element is designed.According tothe deflection angle and momentum of a charged particle passing through the magniticfield,computation and logieal judgment can be done immediately for the track signal registered before.     

商洛钒尾矿烧制轻质高强陶粒的研究

采用80wt;商洛钒尾矿为主要原料,加入钾长石、粘土为辅助原料,以SiC为发泡剂,制备性能优异的轻质高强陶瓷颗粒.采用单因素变量分析法研究钒尾矿含量、SiC添加量、烧成温度和保温时间对陶粒结构及性能的影响.研究结果表明:随着发泡剂SiC含量的增加、烧成温度的提高和保温时间的延长,陶粒的堆积密度和筒压强度均降低,吸水率均升高.最终加入2wt;SiC为发泡剂,在1125℃下保温30min制得堆积密度631kg/m3,筒压强度9.1MPa,吸水率3.1;的轻质高强陶瓷颗粒.     

CP Violation in W Pair Production via Photon-Photon Collisions Within the THDM-Ⅲ with FCNC

The CP-violating effects in the W pair production via photon-photon collisions are investigated in the fram'e of the THDM-111 with complex neutral current couplings. The numerical calculations manifest the resonance effect and the counteractive behaviour in CP asymmetries between the two CP-violating contributing parts from the h⁰ and H⁰ exchanging s-channel diagrams. We conclude that if the masses of the two neutral Higgs bosons H⁰ and h⁰ are quantitatively largely separated and the colliding energy of photons √s is close to the mass of h⁰ or H⁰, the CP-violating effect is possibly to be observed in this process.     

Collision of Bare Ion Si~(14 ) with the Same Z Slow-atom Si

1　ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｈｉｓｐａｐｅｒｗｅｄｉｓｃｕｓｓｔｈｅｃｏｌｌｉｓｉｏｎｏｆｂａｒｅｉｏｎＳｉ14 ｗｉｔｈｔｈｅｓａｍｅＺｓｌｏｗａｔｏｍＳｉ.Ｉｎｒｅｃｅｎｔｐｕｂｌｉｃａｔｉｏｎｂａｒｅｈｉｇｈ-Ｚｉｏｎｓｃｏｌｌｉｓｉｏｎｗｉｔ...     

类锂等电子系列高位三激发态2p2np4So能量和到1s2pmp4P态的辐射跃迁

利用多组态相互作用方法及Rayleigh-Ritz变分法,计算了类锂离子2p²np⁴S^o(n=2—4)和1s2pmp⁴P(m=2,3)的能量.运用截断变分方法得到能量的改进量.计算了相对论修正、质量极化效应,从而获得了高精度的能量计算值.同时还计算了该系统之间的辐射跃迁波长、振子强度和辐射跃迁率.计算结果与实验符合得很好. 关键词： 三激发态 类锂离子 振子强度 辐射跃迁     

铁电屏蔽理论

利用电极化的边界屏蔽近似,可计算出一些典型铁电单晶的自发极化强度．铁电屏蔽电荷处于表面束缚极化子偶状态;其产生和湮没要跨越位垒．由统计方法给出的一些常见晶体和陶瓷的四种典型电滞回线形状,和实验观察到的结果一致 关键词：