China Three Gorges University

About: China Three Gorges University is a education organization based out in Yichang, China. It is known for research contribution in the topics: Catalysis & Landslide. The organization has 11161 authors who have published 8011 publications receiving 82224 citations. The organization is also known as: Sanxia Daxue.

Structural diversity and properties of ZnII and CdII complexes with a flexible dicarboxylate building block 1,3-phenylenediacetate and various heterocyclic co-ligands

Abstract: A series of ZnII and CdII complexes with a flexible dicarboxylate building block and various heterocyclic co-ligands, formulated as {[Zn2(pda)2(phen)2]·2H2O}n (1), {[Zn(pda)(dpe)]·H2O}n (2), [Zn(pda)(bpp)]n (3), {[Cd2(pda)2(2,2′-bipy)2]·2H2O}n (4), {[Cd(pda)(4,4′-bipy)(H2O)]·H2O}n (5) and {[Cd2(pda)2(bpp)3]·14H2O}n (6) (pda = 1,3-phenylenediacetate, phen = 1,10-phenanthroline, dpe = 1,2-di(4-pyridyl)ethylene, bpp = 1,3-bi(4-pyridyl)propane, 2,2′-bipy = 2,2′-bipyridine, and 4,4′-bipy = 4,4′-bipyridine), have been synthesized and structurally characterized. In 1, the (H2O)8clusters interlink the cyclic coordination dimers to give a 3D network through hydrogen bonding. Both 2 and 3 feature 2D corrugated (4,4) layers, which are of 2-fold interpenetrating for 3. In 4, the dimeric CdII subunits are connected by the 1,3-pda ligands to generate a rampart-shaped 1D chain motif. As for 5, the [Cd(pda)]2 rings are connected by the paired 4,4′-bipy ligands to afford a tube-shaped 1D motif. In contrast to 1–5, complex 6 displays a 3D diamond network and, interestingly, the T5(0)A(0)A(2) water tapes are found to locate in the channels of this 3-D array. A structural comparison of these complexes demonstrates that the characteristics of auxiliary ligands (from chelating to bridging) play a key role in governing the coordination motifs as well as the 3-D supramolecular lattices. Solid-state properties such as photoluminescence and thermal stability of 1–6 have also been studied.

The Stellar Kinematics in the Solar Neighborhood from LAMOST Data

Abstract: We use about 200,000 FGK-type main-sequence stars from the LAMOST DR1 data to map the local stellar kinematics. With the velocity deprojection technique, we are able to derive the averaged three-dimensional velocity and velocity ellipsoids using only the line-of-sight velocity for the stars with various effective temperatures within pc. Using the mean velocities of the cool stars, we derive the solar motion of (, , ) = (9.58 ± 2.39, 10.52 ± 1.96, 7.01 ± 1.67) with respect to the local standard of rest. Moreover, we find that the stars with K show a net asymmetric motion of ∼3 in compared to the stars with K. And their azimuthal velocity increases when increases. This peculiar motion in the warmer stars is likely because they are young and not completely relaxed, although other reasons, such as the resonance induced by the central rotating bar or the spiral structures and the perturbation of the merging dwarf galaxies, cannot be ruled out. The derived velocity dispersions and cross-terms for the data are approximately consistent with previous studies. We also find that the vertical gradients of and are larger than that of . And the vertical gradient of shows a clear correlation with , while the other two do not. Finally, our sample shows a vertex deviation of about at pc, but roughly zero at pc.

Chainmail co-catalyst of NiO shell-encapsulated Ni for improving photocatalytic CO2 reduction over g-C3N4

Abstract: Nickel element cannot exist stably on its own, but with an bared of an NiO shell, nickel element can realize desirable stable existence. Herein, Ni2+ was photoreduced to Ni particles and deposited on graphite carbon nitride (g-C3N4) under vacuum. The surface of Ni particles was oxidized to form an NiO shell after the samples were exposed to air, and elemental Ni was protected by the encapsulation of the NiO shell to realize the coexistence of Ni and NiO. The chainmail co-catalyst of NiO shell-encapsulated Ni over g-C3N4 (Ni/NiO/g-C3N4) was prepared and applied in the photocatalytic reduction of CO2 and showed the best photocatalytic activity when the Ni/NiO loading was 3 wt%. After illumination for 2 h, the CO generation rate reached a value of 27.9 μmol g−1 h−1, which was about nine times that of pure g-C3N4. The steady-state surface photovoltage spectrum (SPV), ultrafast spectrum of transient photovoltage (TPV) and time-resolved photoluminescence (PL) spectra as well as electrochemical tests showed that Ni/NiO/g-C3N4 has a low recombination rate of photogenerated electron–hole pairs. In situ Fourier transform infrared spectroscopy (FT-IR) and DFT calculations were used to explain the photocatalytic mechanism at the molecular level.

A Hybrid Bat Algorithm for Economic Dispatch With Random Wind Power

Abstract: We present a hybrid metaheuristic optimization algorithm for solving economic dispatch problems in power systems. The proposed algorithm, based on bat algorithm, combines chaotic map and random black hole model together. Chaotic map is used to prevent premature convergence, and the random black hole model is helpful not only in avoiding premature convergence, but also in increasing the global search ability, enlarging exploitation area and accelerating convergence speed. The pseudocode and related parameters of the proposed algorithm are also given in this paper. Different from other related works, the costs of conventional thermal generators and random wind power are both included in the cost function because of the increasing penetration of wind power. The proposed algorithm has no requirement on the convexity or continuous differentiability of the cost function, although the effect on fuel cost, caused by the underestimation and overestimation of wind power, is included. This makes it feasible to take more practical nonlinear constraints into account, such as prohibited operating zones and ramp rate limits. Three test cases are given to illustrate the effectiveness of the proposed method.