A green and novel procedure for the preparation of ionic liquid

A green and novel procedure is described for the preparation of a series of ionic liquid containing alkylimidazolium-based or N-alkylpyridinium-based cations and hexafluorophosphate-based or tetrafluoroborate-based anions in one-pot solvent-free conditions to give excellent yields with shortened time.     

The Contribution of the Fourth Order Exchange Diagrams to The Relativistic Microscopic Optical Potential

The contribution of the fourth order exchange diagrams is first studied to the imaginary part of nucleon self-energy,the relativistic microscopic optical potential and the Schrodinger equivalent potential of the relativistic microscopic optical potential based on Walecka's meson-nucleon model.     

Second Order Correction of Relativistic Optical Potential

The imaginary part of the off-energy shell optical potential of a nucleon in nuclear matter, where the polarization and correlation contribution of the exchanges of the σ and ω mesons are taken into account, is derived in the framework of the relativistic meson-nucleon field theory. The second order correction of the real part of the optical potential is calculated in terms of the dispersion relation and the effective mass of a nucleon in the nuclear medium is also investigated in this paper.     

Neutron Relativistic Phenomenological and Microscopic Optical Potentials

The experimental data of the neutron total cross section σ_t,nonelastic cross section σ_non and elastic scattering angular distribution σ_el(θ) for ten target nuclei ranging from ¹²C to ²³⁸U with incident energies E_n=20—1000MeV were used to optimize the relativistic phenomenological optical potential (RPOP) through automatic search of the best parameters by computer.In addition,a relativistic microscopic optical potential (RMOP) based on Walecka model were also used to analyze the same data and compare with the RPOP.
Through comparison between these two kinds of relativistic optical potential hints in improving both the RMOP and RPOP is indicated.     

Three-Parameter Liquid-Drop Model Describing a Large-Amplitude Collective Nuclear Motion

In this paper, the liquid-drop model with three parameters {c, h,a} is used to describe symmetric or asymmetric fission process. The analytical expression of the effective moment of inertia is given. The inertial and frictional tensors of nucleus are evaluated by the Werner-Wheeler method. Based on a standard liquid-drop model, the Coulomb energy and surface energy are accurately calculated. The scission point of the fissioning nucleus is defined by energy criteria. The salient features of the dynamical coefficients are discussed.     

EFFECT OF NUCLEAR VISCOSITY ON FISSION PROCESS

According to the fission diffusion model,the deformation motion of fission nucleues is regarded as a diffusion process of quasi-Brownian particles under fission potential,Through simulating such Brownian motion in two dimensional phase space by Monte-Carlo method,the effect of nuclear viscosity on Brownian particle diffusion is studied,Dynamical quantities,suchas fission rate,kinetic energy distribution on scission,and so on are numerally calculated for various viscosity coefficients,The results are reasonable in physics,This method can be easily extended to deal with multi-dimensional diffusion problems.     

The Reaction of Japanese Reagent with Aminoacetamide with Alkyl Group

2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide¹,commonly known as Lawesson's reagent (LR,1a),and Japanese Reagent (1b),are not only thiating agent for diverse carbonyl compounds^1-3, but also they undergoes ring-closure reactions with contain substrates containing two functional groups to give phosphorus heterocycles which contain phosphonothioyliene {C₆H₄-P(S)〈} moiety. These heterocyclic compounds are of potential interest as herbicides,insecticides,and fungicides^4,5. Glycinamides are known as biologically active materials, for example, herbicides, plant-growth regulator⁶. In order to look for potent herbicides⁷ and to extent the use of Japanese Reagent to other bifunctional substrates,its reactions with 3-alkyl-glycinamides 2 have been investigated and found to give new phosphorus heterocycles which possess Significant selective herbicidal activity against rape. Here are our results.     

Study on the Reaction of Tricovalent Chlorophosphines with Aldehydes Containing Withdrawing Electron Groups

α-Polychloroalkyl phosphoric dichlorides and their derivatives 2,3,4 has insecticidal activity^1-4 and may be used as an intermediate to make other insecticides by reaction with alcohol, phenol, thiophenol or mercaptan. They can be prepared by various conventional methods of preparing phosphorus thioesters. Here we wish to report the addition reaction of tricovalent chlorophosphines with aldehydes containing withdrawing electron groups and its application in preparing of polychloroalkyl phosphorus dichlorides and their derivatives. The process can be represented by the following equation.     

A CHIRAL SOLITON MODEL OF N AND △ WITH FOUR-FERMION INTERACTION

The four-fermion terms are introduced to investigate the effects of vector mesons in the σ model. A self-consistent solution is achieved in the mean field approximation by using the hedgehog ansatz.The static properties of nucleon are calculated, which are found to be in reasonable agreement with experiments.