加速器高频D电路Q值的计算与测量

介绍了回旋加速器高频单D型盒D电路Q值的计算与测量方法。重点对Q值的理论计算进行推导,并对计算原理进行说明。然后对计算结果和测量结果进行比较。得出的计算和测量结果基本吻合。误差产生的主要原因是计算过程中的近似和短路片接触电阻的取值,其中短路片接触电阻是一个重要因素,在设计腔体时应引起足够的重视。

关于量化和A/D-D/A的讨论

数字、量化、量化效应、模拟、模拟量、A/D转换、D/A转换是计算机控制工程和控制理论上的常见概念。静心推敲,发现有不少流行性的误解。例如:不是“量化”而是截尾或四舍五入,不是“数字量”而是bit量,不是“模拟量”而是物理量等。

Tree-ring-derived precipitation records from inner Mongolia；China；since a.d. 1627

IEECAS SKLLQG

Tree-ringbased drought reconstruction (a.d. 1855-2001) for the Qilian mountains；northwestern China

IEECAS SKLLQG

Compound specific D/H ratios and molecular distributions of higher plant leaf waxes as novel pale oenvironmental indicators in the Chinese Loess Plateau

IEECAS SKLLQG

HIRFLSFC高频D电压测量

介绍了用韧致辐射能谱测量高频 D电压方法及测量结果。此方法的优点在于不受高频频率、主磁场及分布参数的影响

低能氘离子束轰击固体靶产生的远程D-D核聚变现象研究

利用强流低能氘离子束轰击由吸氢金属形成的氘自吸收靶，研究固体内Ｄ－Ｄ聚变反应规律。并通过对实验测得的Ｄ－Ｄ聚变伴随粒子能谱，探索Ｄ－Ｄ聚变反应与靶材料结构的相关性。同时，利用氘团族离子（ｄ３＋）和氘核（ｄ＋）来轰击吸氘固体，研究固体内Ｄ－Ｄ聚变反应的特性。实验中观测到了伴随离子能谱中介于质子峰（３ＭｅＶ）和氚峰（１ＭｅＶ）之间的一个宽峰。结果分析表明。该峰是由固体靶内超出离子射程几倍至十几倍处发生的Ｄ－Ｄ聚变反应出射的质子所形成。同时还发现独立氘核产生的这种深部Ｄ－Ｄ核聚变的反应率高于速度相同的氘团簇离子中的氘核的反应率。

Evidence of N-*(1535) resonance contribution in the pn -> d phi reaction

The N ∗(1535) resonance contributions to the pn → dφ reaction are evaluated in an effective Lagrangian model. The π-, η-, and ρ-meson exchange are considered. It is shown that the contributions from π- and ρ-meson exchange are dominant, while the contribution from η-meson exchange is negligibly small. Our theoretical results reproduce the experimental data of both total cross section and angular distribution well. This is more evidence that the N ∗(1535) resonance has a large s ¯s component leading to a large coupling to Nφ, which may be the real origin of the Okubo-Zweig-Iizuka rule violation in the πN and pN reactions.

Theoretical study of p-d hybridization in Co perovskite

The real-space recursion method and unrestricted Hartree-Fock approximation have been applied to calculate the density of states of various Co perovskite, CeCoO3, SrCoO3 and Sr1-xCexCoO3. We have studied the magnetically ordered states of these Co perovskites in an enlarged double cell, and find its various magnetic structures due to the occupancy of 3d band and its interaction with neighboring Co ions. In this study, we have studied the p-d hybridization of the three Co perovskites, we find t(2g) electrons are localized and the flat e(g) band is responsible for the itinerant behavior, and although the rare earth elements itself contribute little to the DOS at the Fermi energy, the DOS at Fermi energy and the magnetic moment changed consequently because of different valence of Co ions in these compounds and p-d hybridization effect is very important. (C) 2009 Elsevier B.V. All rights reserved.

N*(1535) contribution in pp -> pp eta ' and pn -> d phi

In an effective Lagrangian model we find that the N*(1535) resonance contribution might be important to the interpretation of the present data of the pp -> pp eta' and pn -> d phi reactions. The strong coupling strength of N*(1.535) to eta' and phi are indicated, and the possible implication to the intrinsic component of N*(1535) is explored. These results may provide hints to the real origin of the OZI rule violation. It is stressed that further measurements could be performed at the Cooling Storage Ring (CSR) at Lanzhou of China.

Observed charmed hadron Lambda(c)(2940)(+) and the D* N interaction

In this work, we systematically study the interaction of D* and nucleon, which is stimulated by the observation of Lambda(c)(2940)(+) close to the threshold of D* p. Our numerical result obtained by the dynamical investigation indicates the existence of the D* N systems with J(P) = 1/2(+/-), 3/2(+/-), which not only provides valuable information to understand the underlying structure of Lambda(c)(2940)(+) but also improves our knowledge of the interaction of D* and nucleon. Additionally, the bottom partners of the D* N systems are predicted, which might be as one of the tasks in LHCb experiment.