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Stereoselective Addition of N-Alkylhydroxylamines to α,β-Unsaturated Nitro Compounds

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Chinese Chemical Letters 2006年第7期17卷 859-862页

作者： Ai Jun LI Ji Cheng CHU hong sheng guo Xue Qin ZHOU Dong Zhi LIU School of Chemical Engineering and Technology Tianjin University Tianjin 300072 Medical College Chinese People＇s Armed Police Force Tianjin 300071

N-Alkylhydroxylamines have been shown to undergo a stereospecific cis addition to 1-phenyl-2 -nitropropene compounds, whereas the corresponding O-alkylhydroxylamines give no diastereoselectivity. The concerted additio... 详细信息

关键词： N-Alkylhydroxylamines O-alkylhydroxylamines concerted addition mechanism α,β-unsaturated nitro compounds stereoselectivity.

Rural Infrastructure Construction in New Socialist Countryside Construction

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Asian Agricultural Research 2012年第5期4卷 64-66,70页

作者： guo hong-sheng ,guo Yue-jun Agricultural University of Hebei,Baoding 071000,China

In the background of new socialist countryside construction,rural infrastructure construction is favorable to consolidating fundamental position of agriculture,expanding rural job opportunities,increasing farmers' income,and favorable to development of rural economy and the national economy. Rural infrastructure construction mainly includes construction of agricultural basic production conditions,construction of rural ecological environment,construction of agricultural service system,and construction of rural living facilities. Finally,we put forward approaches and methods for strengthening rural infrastructure construction: firstly,increase fund input to provide financial support for rural infrastructure construction; second ly,make scientific village planning to ensure sustainability of rural infrastructure construction; thirdly,arouse farmers' enthusiasm and initiative to promote stable development of rural infrastructure construction.

关键词： New socialist countryside construction Rural infra

Effects of chest compressions on cardiorespiratory function in a non-arrested porcine model

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Chinese Medical Journal 2013年第12期126卷 2348-2353页

作者： CONG Lu-hong LI Chun-sheng guo Zhi-jun WANG Shuo WU Jun-yuan YUAN Wei Department of Emergency Medicine Beijing Chaoyang Hospital Capital Medical University Beijing 100020 China

Background The effects of chest compressions to hemodynamic and respiratory parameters during hands-only cardiopulmonary resuscitation （CPR） in a non-arrested patient who suddenly collapses are *** this research,we investigated the effects of chest compressions in a non-arrested porcine *** Fourteen male domestic pigs were randomized into sham control group （SHAM group,only anesthetized and instrumented without chest compression,n=6） or chest compression group （CC group,2 minutes of chest compressions,n=8）.Continuous hemodynamic parameters,dynamic lung compliance （Cdyn）,and blood gas analysis outcomes were *** levels of catecholamine were measured at baseline and 2 minutes,30 minutes,4 hours,and 24 hours after chest *** computed tomography （CT） was performed at 30 minutes and 24 *** histopathology evaluation was *** After two minutes of chest compressions in the CC group,heart rate and extravascular lung water increased significantly; mean arterial pressure,stroke volume,and global ejection fraction significantly *** significantly decreased to valley levels at 30 minutes and slowly *** with the baseline,serum levels of catecholamine significantly increased at 2 minutes and rapidly decreased 24 hours *** 30 minutes after chest compressions,chest CT showed local exudation,which was absorbed 24 hours *** This research showed that 2 minutes of chest compressions causes various heart and lung tissue damage in the normal a normal porcine *** also impacts the hemodynamic and Cdyn.

关键词： chest compression lung contusion cardiopulmonary function non-arrested

Preparation and Selectivity of Molecularly Imprinted Polymer Coating on the Micro Pore Membrane of Polytetrafluoroethylene

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Chinese Chemical Letters 2003年第9期14卷 979-982页

作者： hong sheng guo, Yu Mei JIA, Xi Wen HEState Key Laboratory of Functional Polymer Materials for Adsorption and Separation,Department of Chemistry, Nankai University, Tianjin 300071 The College of Pharmaceuticals and Biotechnology, Tianjin University, Tianjin 300072 State Laboratory of Functional Polymer Materials for Adsorption and Separation Department of Chemistry Nankai University The College of Pharmaceuticals and Biotechnology Tianjin University

In order to obtain mechanically stable membrane for practical application, the imprinted polymer was synthesized in the pores of polyfluoromembrane, the binding and transport ability of the membrane were studied.

关键词： Molecular imprinting trimethoprim membrane of polytetrafluoroethylene.

支板火箭引射冲压发动机引射模态燃烧流动 (Ⅰ)瞬时掺混燃烧流场的数值模拟

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推进技术 2003年第2期24卷 160-165页

作者：黄生洪何国强何洪庆西北工业大学航天工程学院陕西西安710072

针对一种适用于多种工作模态的支板火箭引射冲压组合发动机构型,Ma在0～1来流范围的瞬时掺混(SMC)引射燃烧流场进行了数值模拟。详细分析了低速模态SMC湍流流场的流动结构及特征,并对其Ma在0～1范围的性能进行了分析,结果Ma在大于等于0.... 详细信息

针对一种适用于多种工作模态的支板火箭引射冲压组合发动机构型,Ma在0～1来流范围的瞬时掺混(SMC)引射燃烧流场进行了数值模拟。详细分析了低速模态SMC湍流流场的流动结构及特征,并对其Ma在0～1范围的性能进行了分析,结果Ma在大于等于0.7范围内获得了推力增强。结论认为该种构型的组合发动机适用于作为机载导弹的动力装置,而更低马赫数范围(包括Ma=0)内的推力增强取决于多种因素的优化匹配。

关键词：火箭基组合动力循环冲压火箭发动机引射式冲压发动机燃烧数值仿真

Sequence-activated chemiluminescence probes: programmable illumination for high-contrast in vivo sensing and imaging

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Science China Chemistry 2025年第01期 26-34页

作者： Yutao Zhang Juan Li Wei-hong Zhu Zhiqian guo Shanghai Key Laboratory of Functional Materials Chemistry Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology State Key Laboratory of Bioreactor Engineering Shanghai Frontier Science Research Base of Optogenetic Techniques for Cell MetabolismEast China University of Science & Technology

Sequence-activated chemiluminescence(CL) technique offers a unique approach to detecting specific biomolecules or cellular events with high sensitivity and spatial resolution. The fundamental principle behind sequence-activated CL probes involves tailoring highly-controllable CL signals in response to specific sequences or events of interest, thus enabling high-contrast signals under complex physiological conditions. This sequential activation could be triggered by enzymes, reactive oxygen species(ROS), biothiols or changes in the microenvironment. These unique sequence-activated CL probes bestow several advantages, including minimal background, deep-tissue penetration, and the ability of non-invasive or minimally invasive detection. The sequence-activated CL techniques represent a significant advancement in molecular imaging and diagnostics. In this mini-review, we focus on the latest developments in sequential CL probes, addressing the technical challenges and discussing the future trajectory by harnessing CL signaling and molecular recognition.

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Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi Ding Zhe Sui hong Su Xu guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

Plasmonic tandem heterojunctions enable high-efficiency charge transfer for broad spectrum photocatalytic hydrogen production

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Journal of Energy Chemistry 2025年第1期100卷 710-720页

作者： Wenxuan Chen Xiu-Qing Qiao guo Hui Bojing Sun Dongfang Hou Meidi Wang Xueqian Wu Tao Wu Dong-sheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Hubei Three Gorges Laboratory College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry Jinan University

Rational engineering of semiconductor photocatalysts for efficient hydrogen production is of great significance but still challenging,primarily due to the limitations in charge transfer ***,a fascinating plasmonic tandem heterojunction with the hc-CdS/Mo2C@C heterostructure is aimfully prepared for effectively promoting the charge separation kinetics of the CdS photocatalyst via the synergistic strategy of phase junction,Schottky junction,and photothermal *** difference in atomic configuration between cubic-CdS （c-CdS） and hexagonal-CdS （h-CdS） leads to effective charge separation through a typical Ⅱ charge transfer mechanism,and plasmonic Schottky junction further extracts the electrons in the hc-CdS phase junction to realize gradient charge ***,the photothermal effect of Mo2C@C helps to expand the light absorption,accelerate charge transfer kinetics,and reduce the hydrogen evolution energy *** carbon layer provides a fast channel for charge transfer and protects the photocatalyst from *** a result,the optimized hc-CMC photocatalyst exhibits a significantly high photocatalytic H2production activity of 28.63 mmol/g/h and apparent quantum efficiency of 61.8%,surpassing most of the reported *** study provides a feasible strategy to enhance the charge transfer kinetics and photocatalytic activity of CdS by constructing plasmonic tandem heterogeneous junctions.

关键词： Heterojunctions LSPR Photocatalyst Phase junction Schottky junction Photothermal effect

Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 97-108页

作者： Pan guo hong-Bo Jin Cong-Feng Qiao Yue-Liang Wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of Sciences The School of Physical Sciences University of Chinese Academy of Sciences Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University National Astronomical Observatories Chinese Academy of Sciences Institute of Theoretical Physics Chinese Academy of Sciences

For space-based gravitational wave （GW） detection,the main noise source for massive black hole binaries （MBHBs） is attributed to approximately 10～7double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratio ?DL/DLat the 95%confidence level,is enhanced by factors of ～*** angular resolutions,denoted by??s,are enhanced by a factor of ～*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries