A Microporous Hydrogen-Bonded Organic Framework Based on Hydrogen-Bonding Tetramers for Efficient Xe/Kr Separation

Hydrogen-bonded organic frameworks (HOFs) have been emerging as a new type of very promising microporous materials for gas separation and purification, but few HOFs structures constructed through hydrogen-bonding tetramers have been explored in this field. Herein, we report the first microporous HOF (termed as HOF-FJU-46) afforded by hydrogen-bonding tetramers with 4-fold interpenetrated diamond networks, which shows excellent chemical and thermal stability. What's more, activated HOF-FJU-46 exhibits the highest xenon (Xe) uptake of 2.51 mmol g⁻¹ and xenon/krypton (Kr) selectivity of 19.9 at the ambient condition among the reported HOFs up to date. Dynamic breakthrough tests confirmed the excellent Xe/Kr separation of HOF-FJU-46a, showing high Kr productivity (110 mL g⁻¹) and Xe uptake (1.29 mmol g⁻¹), as well as good recyclability. The single crystal X-ray diffraction and the molecular simulations revealed that the abundant accessible aromatic and pyrazole rings in the pore channels of HOF-FJU-46a can provide the multiple strong C−H⋅⋅⋅Xe interactions with Xe atoms.     

Continuous-Time Independent Edge-Markovian Random Graph Process

In this paper, the continuous-time independent edge-Markovian random graph process model is constructed. The authors also define the interval isolated nodes of the random graph process, study the distribution sequence of the number of isolated nodes and the probability of having no isolated nodes when the initial distribution of the random graph process is stationary distribution, derive the lower limit of the probability in which two arbitrary nodes are connected and the random graph is also connected, and prove that the random graph is almost everywhere connected when the number of nodes is sufficiently large.     

与玻色-爱因斯坦凝聚体相互作用的量子光场的非经典特性

文章研究与玻色－爱因斯坦凝聚体相互作用的量子光场的非红典特性,表明当光场初始处于相干态,原子初始处于数态时,量子光场在时间演化过程中表现出松光子统计。发现对任意的初始原子数态和寝光强度,量子８光场的动力学都有不具有光场正交分量的二阶压缩,但在一定条件下,可以表现出高阶压缩,我们详细研究了量子光场的四阶压缩特性,给出了四阶压缩的条件。     

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.     

A Note on Algebraically Special,Asymptotically Simple and Empty Spacetime

It is proved that subject to certain physically reasonable restrictions on the curvature of spacetime, an algebraically special, asymptotically simple and empty spacetime is necessarily a copy of the Minkowski space. This imposes further requirements a nontrivial asymptotically simple and empty spacetime has to satisfy.     

The Higher-Order Approximation in General Theory of Self-consistent Field Beyond Hartree-Fock

In this paper, the higher-order approximation in the general theory of self-consistent field is presented by the Wick's theorem, and the solution of equations is discussed.     

U(1/1)q q-Coherent States and Path Integrals for the q-Deformed Jaynes-Cummings Model

The q-coherent states for the quantum superalgebra U(1/1)_q, are introduced. Path integrals in the q-coherent state representations of the U(1/1)_q, are constructed and applied to the q-deformed Jaynes-Cummings model whose dynamical superalgebra is the quantum superalgebra U(1/1)_q.     

THEORETICAL INVESTIGATION OF THE ISOSPIN VIOLATING HADRONIC TRANSITIONS Ψ'→Ψ(11P1)+π° AND T"→T(11P1)+π°

The isospin violating processes Ψ'→Ψ(1¹P₁)+π° and T"→T(1¹P₁)+π° are investigated in the framework of the multipole expansion in quantum chromodynamics. Using the rate of Ψ'→Ψ+π° as an input to determine the isospin violating vertex, we obtain the following branching ratios for the processes BR(Ψ'→Ψ(1¹P₁)+π°)～10^-6-10^-5, BR(T"→T(1¹P₁)+π°)～10^-5-10^-3 for M₁1_p1=1/9(5M₁3_p2+3M₁3_p1+M₁3_p0). These are too small to be detected in the present experiments.     

SEEKING FOR THE U(5) LIMITING CASE OF IBA-Ⅱ

In the region of even-even nuclei from A=96 to A=120, only the energy spectrum of ¹¹⁰₄₈Cd₆₂ may be described by IBA-Ⅱ involving the states {N_π +N _L -1,1}. But it can be described by IBA-Ⅰ too. To distinguish these two schemes, more angular momentum measurement is needed.     

快波少数离子加热

对快波少数离子加热的机理进行了比较详细的讨论.通过射线轨迹算法对两种离子的等离子体快波加热进行了数值模拟,并给出了两种离子不同浓度比的计算结果.