[en] By using quantum mechanics calculation, we present a straightforward method to give the bounds for the electronic density of state in tetrahedrally bonded amorphous solids. The results are quite consistent with Weaire's which are obtained using the diagram method. (author)

[en] The coefficients of the nonlinear terms in a modified Altarelli-Parisi evolution equation with parton recombination are determined in the leading logarithmic (Q²) approximation. The results are valid in the whole x region and contain the translation GG → qq-bar, which is inhibited in the double leading logarithmic approximation. The comparisons of the new evolution equation with the Gribov-Levin-Ryskin equation are presented

[en] By using the valon model, the electric form factor of the proton in the nucleus G_E^P(Q²), and π decay constant f_π are discussed. After combining the (e, e') reaction on the ⁵⁶Fe near the quasi-elastic peak, it is found that G_E^P(Q²) and f_π are influnced by the nuclear medium and their modifications resulting from increased hadron size as the distortions of structure functions (EMC effect) do

[en] Relay protection device of nuclear power plant transformer provided by Russia to Tianwan Nuclear Power Plant had mal-operated in service. In order to raise its operational reliability, Tianwan NPP modified the Russian device, and put domestic device into practice. The paper sums up the technology feature, R and D innovation and the operational condition of domestic relay protection device. Some feedback and experience can be learned for the follow-up expansion project or similar units. (authors)

[en] Parton recombination corrections to the standard spin-dependent Altarelli-Parisi evolution equation are considered in a nonlinear evolution equation. The properties of this recombination equation and its relation with the spin-averaged form are discussed

[en] Authors have discussed the effect of valence quark mixing in DIS process. This effect, together with the pion cloud effect, dominates the violation of Gottfried sum rule

[en] Standard evolution equation including virtual graphs is derived in time ordered perturbative theory. The authors propose a new cutting rule in deep inelastic scattering processes, which provides a useful tool for discussing the connections among the real and virtual cut diagrams and better understanding of evolution equation

[en] Importance of the bag skin effect to determine the parameters of the Friedberg-Lee model is pointed out. The European Muon Collaboration (EMC) effect regarded as a bag skin effect can be used to determine the parameters of this model

[en] In this paper, the forms of the gluon distribution function at different Q² are discussed with the aid of the three quark model and the dynamical calculations of QCD (the leading logarithm approximation). The Buras-Gaemers parametrization is improved and the gluon distribution function obtained can be parametrized by the simple parameter form xG(x,Q²) = xG₁(x,Q²) +xG₂(x,Q²) = [1+B(s)]< xG₁(Q²)>₂ (1-x)/sup /(s)] +[1+D(s)] < xG(x,Q²)>(1-x)/sup D/(s). The form satisfies the QCD evolution equation and does not contradict evidently the existing experimental data. The properties of the gluon content in a nucleon are analyzed on this basis. The result indicates that the gluon distribution function can be considered as consisting of two different parts: a soft component and a hard component

[en] The gluon recombination functions in the twist-4 QCD evolution equations are studied at the leading logarithmic approximation using both the covariant and noncovariant methods. The authors point out that the gluon recombination functions in the GLR-MQ evolution equation are unavailable. The methods avoiding the IR divergences are discussed, which can be used in the derivations of the evolution kernels and coefficient functions at higher twist level