碳纳米管的功能化及其电化学性能

超级电容器作为一种新型的储能元件,以其快速储存、释放能量等优点,近年来成为各国科研工作的研究重点和焦点[1￣3],并在数据记忆存储系统、便携式仪器设备、后备电源、通讯设备、计算机、燃料电池、电动车混合电源等许多领域都有广泛的应用前景[4]。目前,超级电容器用的电极材     

Quantum action-angle variables for harmonic oscillators

The well-known difficulties of defining a phase operator of an oscillator, caused by the lower bound on the number operator, is overcome by enlarging the physical Hilbert space by means of a spin-like, two-valued quantum number. On the enlarged space a phase representation exists on which trigonometric functions of the phase are numbers, and the “number of quanta” is a differential operator. Physical results are recovered by projection on the “upper components.” Coherent states, indeterminacy relations, as well as generalizations to other Hamiltonians, including the quantum analog of the quasi-periodic case, are discussed.     

Overcomplete multicenter basis sets

The distribution of eigenvalues of the overlap matrix is analyzed for large and, in the limit, infinite overcomplete multicenter basis sets. It is shown that in the limit the eigenvalues become infinitely degenerate. A numerical example is given and discussed in terms of a semiclassical distribution in phase space.     

不完全信息研发合作的形成及参与人行为选择因素

本通过囚徒困境重复博弈模型的思想研究合作研发中参与人合作策略形成的条件，考察了不完全信息研发合作中参与人合作行为的基础，并在此基础上讨论了研发合作中合作预期收益、不合作激励和合作机会成本对参与人研发合作行为选择的影响。     

Photoproduction of ω mesons from complex nuclei targets

Measurements are presented of the cross sections for omega meson photoproduction at a mean energy of 3.9 GeV from nuclear targets of D, Be, C, Al, Cu, Ag, Au. An optical and Glauber model analysis of the coherent cross sections has been performed to obtain the ω-nucleon cross section, σ_ωN, and the photon-omega coupling constant γ_ω²/4π. Our results are summarised in table 4. We find good agreement with the quark model prediction that σ_ωN = σ_?N, and with the value of γ_ω2/4π determined from the storage ring experiments and from an earlier complex nuclei measurement. However, we disagree with more recent complex nuclei measurements which found a high value of γ_ω²/4π.     

A New Chiral β-Sulfiny Dienophile for Asymmetric Diels-Alder Reaction

Reaction of a chiral cis-β-sulfinylacrylate, prepared from (1R,2S,3R)-3-mercapto-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol, and cyclopentadiene produced Diels-Alder cycloadductswith extremely high diastereoselectivity.     

Nitrogen in diamond studied by magnetic resonance

Nitrogen is the most common substitutional impurity in diamond. Much of the information about the many different defects in diamond containing nitrogen atoms has been found by magnetic resonance. This information is reviewed, and the possibility is discussed of finding information about more such centres, mechanisms of their formation and alteration by external influences. The unambiguously identified centres involve either: (a) only substitutional nitrogen atoms, up to three in number, (b) a combination, of substitutional nitrogen atoms and vacancies, (c) substitutional nitrogen and other foreign atoms. Speculations are made about the atomic models of less well characterized centres, as well as about some simple possible centres which have not yet been identified.     

六角密堆结构的Mbius变换及镁的对势

提出并证明了一个适用于六角密堆(hcp)结构的Mbius变换公式.从晶体中原子的结合能出发，利用这个公式可以得到具有hcp结构的晶体中原子间的相互作用对势.作为例子，利用这一方法计算了镁的对势. 关键词：     

Rotational bands in the light odd-mass Tl nuclei

The odd-mass nuclei ^191–197Tl have been formed in a variety of (HI, xn) reactions and studied by in-beam spectroscopic techniques. The decay of the high-spin Pb isomers, also formed in (HI, xn) reactions, leading to ^193–197Tl has also been investigated. Evidence is presented for the existence of levels of the previously proposed $\text{9}\text{2}{}^{\mathrm{?}}\text{[505]}$rotational bands in the nuclei. Tentative evidence is given for the existence of oblate rotational bands, based on the $\text{13}\text{2}{}^{\mathrm{+}}\text{[606]}$ state, in ^191–195Tl.