A complementary visible-light photocatalytic construction of beta-functionalized thioethers from odorless sulfonyl chlorides or sodium sulfinates is described via PPh3-mediated deoxygenation to generate thiyl radicals, establishing two distinct pathways. In the alkene difunctionalization mode, thiyl radical addition followed by radical-polar crossover affords beta-substituted thioethers (C-N, C-C, C-O, C-S). In contrast, the radical-radical cross-coupling with 1,2-dichloroethane likely enabled by Con-PET reduction could furnish beta-chlorothioethers, whose chlorine handle allows diverse derivatizations and late-stage functionalization. This odorless, mild platform provides unified access to structurally diverse beta-functionalized thioethers.

We have developed a versatile photocatalytic platform for the direct benzylation of diverse C(sp3)-H bonds using N-acyl carbamothioates derived from readily available alcohols as benzyl radical precursors. This protocol operates through two complementary manifolds: a consecutive photoinduced electron transfer (Con-PET) process for the benzylation of N-α-C(sp3)-H bonds and a thiol-mediated hydrogen atom transfer (HAT) cycle for more challenging substrates including alkenes, ethers, thioethers and toluenes. This deoxygenative strategy enables efficient C(sp3)-C(sp3) radical-radical cross-coupling without transition-metal-coupling catalysts, external oxidants, or radical stabilizers, delivering the desired products in moderate to good yields (up to 70%).

Abstract Reported herein is a stereoselective synthesis of 9-aryl-1-vinyl-tetrahydro-β-carbolines via a Pictet–Spengler reaction. This reaction proceeds via Brønsted acid-catalyzed cyclization of N-indole-tethered allenamides with >20:1 dr under mild conditions, while chiral phosphoric acid catalysis installs the C–N axial chirality with high enantioselectivity (up to 98% ee). An ortho-amide directing group and proper choice of catalyst prove crucial for the stereocontrol. Furthermore, divergent derivatizations of the products, particularly elaboration of the vinyl group, highlight the synthetic utility of this protocol.

Herein, a visible-light-driven tandem Wolff rearrangement/Staudinger cycloaddition of α-diazoketones with quinone imine ketals (QIKs) is developed, generating spiro β-lactams that undergo divergent C3-C4 bond cleavage under acid or thermal conditions to afford 3,3-disubstituted oxindoles or 2-arylacrylamides, respectively. Extensive mechanistic studies reveal distinct concerted and stepwise pathways. This one-pot, one-step protocol proceeds under mild, metal-free conditions, releasing only N2 and methanol as byproducts, which also provides a rare example of condition-controlled divergent ring manipulation of β-lactams via C3-C4 bond cleavage.

Herein, we report a photocatalytic redox-neutral and reductive deoxygenative alkylation of N-acyl carbamothioates from benzylic alcohols, with substituted Hantzsch esters and allylic sulfones to afford unsymmetrical 1,2-diaryl ethanes and allylarylmethanes, respectively. This protocol facilitates facile deoxyalkylation of primary, secondary, and tertiary benzylic alcohol-derived N-acyl carbamothioates, which features mild reaction conditions, broad functional group tolerance, and the obviation of external S/O trapping reagents as well as transition metal-coupling catalysts.

Herein, the N-heterocyclic carbene (NHC) catalyzed ring opening of bicyclo[1.1.0]butanes (BCBs) with aldehydes and Togni I reagents through a three-component radical relay process is reported, which affords 1,1,3,3-tetrasubstituted cyclobutanes. This reaction exhibits exclusive regioselectivity and up to excellent diastereoselectivity under mild and operating-simple conditions. Gram-scale synthesis and several product derivatizations demonstrate their potential utilities as versatile building blocks in synthetic chemistry.

Directly with arylsulfonyl chlorides, a green and efficient deborylativesulfonylation of aryl(alkenyl)boronic acids has been developed to access both diarylsulfones and vinylarylsulfones in moderate to excellent yields at room temperature under visible-light irradiation. This protocol features broad C(sp2)-arylsulfone applicability, simple operation, accessibility of raw materials and ease of scale-up. The key to the success of this photoredox transformation is introducing catalytic amounts of additives, naphthalen-2-ols, thus boosting the formed electron donor-acceptor (EDA) complexes, which can dramatically improve not only the reaction efficiency but also the selectivity. This strategy was inspired and derived from specific substrates, representing a rare paradigm of how to exploit a more general reaction system. Moreover, extensive control experiments provide insights into the proposed mechanism.

Herein, we disclosed a protocol for the deoxygenation of allyl arylsulfones to access the corresponding thioethers under photoredox conditions by a "cut-sew" strategy. The key to the success of the deoxygenation process is using triarylphosphines not only as the terminal reductants, but also as the reaction initiators. Deeper understanding of this deoxygenation process enabled the intermolecular deoxygenative allylation.

Lewis base and Bronsted base controlled chemodivergent annulations of alpha-methyl substituted allenyl imide and o-aminotrifluoroacetophenones are realized to afford highly valuable furo[3,2-b]indol-2-ones and dihydroquinolines bearing a CF3-substituted quaternary stereogenic center. The possible reaction mechanisms are proposed through deuterium labelling experiments. This work demonstrates the unprecedented dual reactivities of alpha-methyl substituted allenyl imide with electrophilic-nucleophilic compounds in annulation reactions, and features chemodivergence in transforming allenyl imide through beta'-C-H functionalization via phosphine catalysis and beta/gamma-bisfunctionalization via Bronsted base catalysis.

Layered double hydroxide (LDH) based heterojunction is a potential material for photodegradation of organic pollutants due to the high carrier separation efficiency, strong redox ability, and excellent mineral morphology features, while the conventional wet method for the fabrication of LDH-based heterojunction is a complicated process with potential secondary risks. In this paper, Bi2WO6/Zn-Al LDH heterostructures as highly effective photocatalysts were successfully fabricated by a facile two-step mechanochemical method. The phase composition, micromorphology, superficial chemical properties, optical utilization capability, and electrochemical characteristics of the as-prepared samples were tested, and the photocatalytic capacity was evaluated by degrading bisphenol A. With the inspired migration and restricted recombination of photogenerated carriers enabled by the heterostructure, Bi2WO6/LDH composites were found to exhibit greatly enhanced photocatalytic capacity compared to pristine Bi2WO6 and LDH. The energy band structure and transfer route for photogenerated charge carriers are discussed according to DFT calculations and ESR techniques, thereby illuminating the corresponding reaction mechanism for the photocatalysis process. With these results, this work provides a novel concept for the oriented design and facile fabrication of LDH-based heterostructures with high effectiveness.

为保障群桥水域通航安全和桥梁自身安全,以长江武汉段桥梁为研究对象,分析群桥水域通航环境特征,得出群桥水域具有桥梁间距小、通航孔交错分布、桥梁轴线不平行和交通流复杂等结论.在此基础上,建立群桥水域通航环境模型,以航路长度代价、碍航物碍航代价和航路平滑代价为目标建立群桥水域航路规划代价模型,从船舶操纵性角度分析群桥水域船舶航路规划的约束条件,分别采用内罚-PSO和外罚-PSO方法实现群桥水域多约束航路规划,规划出船舶在给定条件下的最优航路.通过对比分析发现,内罚-PSO算法无论是在求解精度上还是收敛速度上均略优于外罚-PSO算法,可很好地应用于群桥水域航路规划研究中.

To solve the problem of ship route planning in multi‐bridges water area ,the route cost model based on length of route and was established after analyzing the water features .Then ,the PSO ,ABC and AFSA algorithm are used to solve the model .It turns out that all of the three bionic intelligent al‐gorithm are able to be used to solve this problem .The pros and cons are analyzed ,which lays the foundation for the further study on this question .

Aiming at the characteristics of the Yangtze River Nan‐liu section an evaluation index system is set up .Combined the AHP method with the cloud model ,a mathematics model of aids to navigation efficiency evaluation is established ,then by using the MATLAB GUI tool the Aids to navigation the efficiency evaluation visualization software is developed .Finally ,according to the evaluation results some improvements related to the efficiency of Aids to navigation are put forward .

To solve the problem of ship route planning in multi‐bridges water area ,the route cost model was established after analyzing the water features .Then ,the Hybrid based PSO ,Natural Selection based PSO ,and Simulated Annealing based PSO algorithm are used to solve the model .It turns out that all of the Hybrid PSO algorithms are better than the standard PSO algorithm ,w hich lays the foundation for the further study on this question .

该文综述了赤泥的形成以及赤泥的物理性质、化学成分、矿物组成。并对赤泥在水泥基材料中的综合应用:水泥生料和混合材、生产碱激发水泥、混凝土掺合料以及路面基层的研究进展进行了报道,也总结了其在陶瓷、微晶玻璃中的应用研究的进展情况。

According to the technoloy plan science fund project "intelligence simulation in concrete structure existing environment (2008CDB396)",in caption of hubei.For the deficency of present concrete s tructure endurance test installment.We design a type of concrete durability test corrosion solution concentration control system in concrete structure existing environment,which is based on the study of the pre-211 project-"single-axis constraint adjustable concrete temperature-stress testing machine",using C51 Microcontroller as the main controller.The system is used in the concrete durability experiment,simulated the corroded solution chloride ion density in the enviromental cabinet,guaranteed that the density o f chloride ion in which the concrete durability experiment test sample locates stabilze in the hypothesis scope.The system uses the buffer solution into the regulation and cycle way ;the controller uses the direct-reading ion concentration controller,signal acquisition ismore convenient.The system we designed not only has simple structure,high reliablity of work,but also to reduce human waste,improve operational economy.

Discusses the mobile database of SQL server CE and its characteristics,analyzes in detail its RDA(Remote Data Access) and Replication data synchronization technologies,including their respective characteristics and application environment,and describes the implementation processes of two kinds of data synchronization technologies,compares which environment that is fit for these two technologies.

本文在相关汽车零部件产业竞争力评价研究综述的基础上,从产业规模、产业效益、产业研发投入、产业链地位、产业进出口等方面对中国乘用车零部件产业竞争力进行了分析,得出中国乘用车零部件产业竞争力与世界先进国家还有较大差距的结论,并提出了提高中国乘用车零部件产业竞争力的方向。

在中国汽车零部件出口保持高速增长的背景下,从出口规模、出口产品的种类、出口区域、出口企业性质等方面分析中国汽车零部件的出口现状及存在的问题,结果表明,中国零部件出口产品附加值低,关键零部件大多由外资企业所控制,中国汽车整车企业与汽车零部件企业的协作程度较低。