摘要：Let F be the underlying base field of characteristic p 〉 3 and denote by M the even part of the finite-dimensional simple modular Lie superalgebra M. In this paper, the generator sets of the Lie algebra M which will be heavily used to consider the derivation algebra Der（M） are given. Furthermore, the derivation algebra of M is determined by reducing derivations and a torus of M, i.e., Der（m）=ad（m） spanF{∏l ad （ξr＋1ξl）} spanF{adxi,ad（xiξ^v）∏ad（ξr＋1ξl）}. As a result, the derivation algebra of the even part of M does not equal the even part of the derivation superalgebra of M.

摘要：The oxygen reduction reaction(ORR)is an important half-reaction for various energy devices,such as fuel cells and metal-air *** sluggish kinetics of the four-electron ORR needs the development of electrocatalysts with high efficiency and activity to replace precious metal ***,metal±nitrogen±carbon catalysts,particularly Fe±N±C,are considered the most promising candidates because their rich active sites can reduce the energy barrier of oxygenic *** this review,the recent research breakthroughs of Fe±N±C catalysts in theoretical and experimental studies are summarized in ***,the mechanistic understanding of the electrocatalytic ORR based on Fe±N±C catalysts is ***,the design strategies of Fe±N±C catalysts and classifications of active sites are expounded,after which the connection between the active site and catalytic performance is ***,the application status of Fe±N±C catalysts in polymer membrane fuel cells and zinc-air batteries is ***,the challenges and opportunities of Fe±N±C catalysts regarding controllable synthesis,mechanism,and applications in energy devices are further proposed.

摘要：Multi-interface engineering is deemed as an effective strategy to boost catalytic activity via electronic structure modulation. However, it is still a big challenge due to the phase-separation tendency. Herein, we designed CoP-WP heterojunctions with multi-touch interfaces using Co_(8)W_(18), a definite structure polyoxometalate-based polynuclear cobalt molecular cluster, as a precursor. The Co P-WP heterojunctions anchored on reduced graphene oxide(Co P-WP/r GO)were obtained by growing Co_(8)W_(18)on GO followed by phosphorization. The intrinsic {Co-O-W} coordination modes in Co_(8)W_(18)are conducive to the formation of the multiple interfaces between CoP and WP. The abundant intimate interfaces in Co P-WP heterojunctions promote the electron transfer from WP to Co P, thus regulating the interfacial electronic structure and optimizing the hydrogen adsorption free energy(ΔGH*), as verified by X-ray photoelectron spectroscopy analysis and theoretical calculations. Furthermore, the integration of r GO provides Co P-WP/r GO with a large surface area and high conductivity, aiding mass transport and charge transfer. Co P-WP/r GO exhibits remarkable hydrogen evolution reaction(HER) activity with low overpotentials of 96, 130,and 138 m V at 10 m A cm^(-2)in alkaline, acidic and neutral media, respectively, and has long-term durability. Our discovery provides an opportunity to design heterojunction materials with multi-coupled interfaces at low-cost and efficient HER catalysts.

摘要：The plow of the submarine plowing trencher is one of the main functional mechanisms, and its optimization is very important. The design parameters play a very significant role in determining the requirements of the towing force of a vessel. A multi-objective genetic algorithm based on analytical models of the plow surface has been examined and applied in efforts to obtain optimal design of the plow. For a specific soil condition, the draft force and moldboard surface area which are the key parameters in the working process of the plow are optimized by finding the corresponding optimal values of the plow blade penetration angle and two surface angles of the main cutting blade of the plow. Parameters such as the moldboard side angle of deviation, moldboard lift angle, angular variation of the tangent line, and the spanning length are also analyzed with respect to the force of the moldboard surface along soil flow direction. Results show that the optimized plow has an improved plow performance. The draft forces of the main cutting blade and the moldboard are 10.6% and 7%, respectively, less than the original design. The standard deviation of Gaussian curvature of moldboard is lowered by 64.5%, which implies that the smoothness of the optimized moldboard surface is much greater than the original.

摘要：Gas sensors have received extensive attention because of the gas pollution caused by rapid construction of urbanization and *** sensors based on semiconductor metal oxide(SMO)have the advantages of high response,excellent repeatability,stability,and cost-effectiveness,and have become extremely important components in the gas sensor *** with regular structures and controllable morphology exhibit more consistent and repeatable ***,during the process of material synthesis,because of the uncontrollability of the microcosm,nanomaterials often show irregularities,unevenness,and other ***,the synthesis of gas sensors with well-aligned one-dimensional(1D)structures,two-dimensional(2D)layered structures,and three-dimensional(3D)hierarchical structures has received extensive *** obtain regular structured nanomaterials with desired morphologies and dimensions,a template-assisted synthesis method with low cost and controllable process seems a very efficient *** this review,we introduce the morphology and performance of SMO sensors with 1D,2D,and 3D structures,discuss the impact of a variety of morphologies on gas sensor performance(response and stability),and shed new light on the synthesis of gas sensing materials with stable structure and excellent performance.

摘要：This paper proposes an intelligent low-thrust orbit phasing control method for multiple spacecraft by simultaneously considering fuel optimization and collision avoidance. Firstly,the minimum-fuel orbit phasing control database is generated by the indirect method associated with the homotopy technique. Then,a deep network representing the minimum-fuel solution is trained. To avoid collision for multiple spacecraft,an artificial potential function is introduced in the collision-avoidance controller. Finally,an intelligent orbit phasing control method by combining the minimum-fuel neural network controller and the collision-avoidance controller is proposed. Numerical results show that the proposed intelligent orbit phasing control is valid for the multi-satellite constellation initialization without collision.

摘要：We have theoretically investigated two series of cyclometalated Pt（II） complexes, a series [Pt （C, N, N） Cl] and b series [Pt （C, N, Npyrazolyl） Cl]. The geometrical and electronic structures are calculated at the ECP60MWB//6-31G＊（H, C, Cl, N, S） basis set level using DFT method; one-photon absorption （OPA） properties are calculated by using both TDDFT and ZINDO methods and two-photon absorption （TPA） properties are obtained with the ZINDO/SOS method. The resonance integrals parameters （βsp and βd） for Pt are adjusted to -1 and -28.5 eV, respectively, to make max OPA wavelength calculated by ZINDO closest to the experimental data and TDDFT results. The calculated results indicate the molecule 2b （[Pt （Cnaphthyl, N, Npyrazolyl） Cl]） has the biggest potential as outstanding TPA materials because （i） the TPA properties of b series are more outstanding in IR wavelength range, the molecules in b series have good transparencies and possess 1-pyrazolyl-NH that is also available for another metal coordination （e.g., dimerization） and chemical interactions; （ii） when C is CnaphthyI in the C, N, N ligand of cyclometalated Pt（II） complexes, the molecules have the best conjugation effect and the best TPA properties.

摘要：This paper is concerned with the free vibration analysis of open circular cylindrical shells with either the two straight edges or the two curved edges simply supported and the remaining two edges supported by arbitrary classical boundary conditions. Based on the Donnell-Mushtari-Vlasov thin shell theory, an analytical solution of the traveling wave form along the simply supported edges and the modal wave form along the remaining two edges is obtained. With such a unidirectional traveling wave form solution, the method of the reverberation-ray matrix is introduced to derive the equation of natural frequencies of the shell with different classical boundary conditions. The exact solutions for natural frequencies of the open circular cylindrical shell are obtained with the employment of a golden section search algorithm. The calculation results are compared with those obtained by the finite element method and the methods in the available literature. The influence of length, thickness, radius, included angle, and the boundary conditions of the open circular cylindrical shell on the natural frequencies is investigated. The exact calculation results can be used as benchmark values for researchers to check their numerical methods and for engineers to design structures with thin shell components.

摘要：In this paper,the mechatronic design and maneuverability analysis of a novel robotic shark are *** obtain good maneuverability,a barycenter regulating device is designed to assist the posture adjustment at low *** on the Newton-Euler approach,an analytical dynamic model is established with particular consideration of pectoral fins for threedimensional *** hydrodynamic coefficients are computed using computational fluid dynamics(CFD)*** amplitudes and phases are determined by fitting an optimized fish body *** performance of the robotic shark is estimated by varying the oscillation frequency and offset *** results show that with oscillation frequency increasing,the swimming speed increases *** robotic shark reaches the maximum swimming speed of 1.05 m/s with an oscillation frequency of 1.2 ***,the turning radius decreases nonlinearly as the offset angle *** robotic shark reaches the minimum turning radius of 1.4 times the body length with 0.2 Hz frequency and 12°offset *** the vertical plane,as the pectoral fin angle increases,the diving velocity increases nonlinearly with increase rate slowing down.

摘要：利用溶胶-凝胶和溶剂热联合技术制备了Pr-N-P三元掺杂锐钛矿TiO2(PrNPTO)纳米片,并采用X射线衍射、透射电镜、N2吸附、X射线光电子能谱、UV-vis吸收谱和光致荧光光谱分析技术对其进行了表征.当Pr掺杂量为1.75 wt%,焙烧温度为550°C时,制得的PrNPTO在可见和紫外光下光催化降解亚甲基蓝(MB)活性最佳.在模拟太阳光照射下,PrNPTO也表现出优越的光催化降解4-氯酚性能(kapp=3.90×10-2 min-1),优于未掺杂、单掺杂和双掺杂TiO2样品,其光活性是P25 TiO2的3.33倍(kapp=1.17×10-2min-1).PrNPTO光活性的提高归因于Pr-N-P三元掺杂增强了紫外和可见光吸收,降低了光生载流子复合,增加了表面羟基以及改善了表面织构特性.在模拟太阳光照射下,PrNPTO光催化效率高且光催化性能稳定,适合于环境净化领域的实际应用..