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某大跨度现浇楼盖结构中框架边梁裂缝原因分析

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四川建筑科学研究 2024年第2期50卷 63-68页

作者：张国强黎杰张洪霞栾学立苏哲山东建筑大学工程鉴定加固研究院有限公司山东济南250013 山东建筑大学土木工程学院山东济南250101 济南市城乡建设发展服务中心山东济南250102

通过对某大跨度现浇楼盖结构中框架边梁破坏现象的观察和计算结果的分析,得出以下结论:框架边梁与楼盖次梁整体现浇时,端部存在嵌固约束作用,特别是支承多根大跨度次梁的框架边梁始终处于弯剪扭复合受力状态。框架边梁两端1/3跨度内协... 详细信息

通过对某大跨度现浇楼盖结构中框架边梁破坏现象的观察和计算结果的分析,得出以下结论:框架边梁与楼盖次梁整体现浇时,端部存在嵌固约束作用,特别是支承多根大跨度次梁的框架边梁始终处于弯剪扭复合受力状态。框架边梁两端1/3跨度内协调扭转嵌固约束作用显著,应高度重视,不可折减或忽略,设计时应考虑抗扭作用;框架边梁中部约1/3跨度内次梁的嵌固约束作用不显著,可不计边梁的约束影响,边梁的最大扭矩变化较小,中部约1/3跨度内次梁可按照两端简支梁设计。

关键词：大跨度次梁协调扭矩扭转刚度框架边梁

Pyrimidine donor induced built-in electric field between melon chains in crystalline carbon nitride to facilitate excitons dissociation

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Chinese Chemical Letters 2023年第3期34卷 546-552页

作者： guoqiang zhang Yangsen Xu Guoshuai Liu Yongliang Li Chuanxin He Xiangzhong Ren Peixin zhang Hongwei Mi College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Guangdong Flexible Wearable Energy and Tools Engineering Technology Research Centre Shenzhen University Shenzhen 518060China Research Centre for Information Technology Shenzhen Institute of Information TechnologyShenzhen 518172China School of Environmental and Civil Engineering Jiangnan UniversityWuxi 214122China

The strong intrinsic Coulomb interactions of Frenkel excitons in crystalline carbon nitride(CCN) greatly limits their dissociation into electrons and holes, resulting in unsatisfactory charges separation and photocatalytic efficiency. Herein, we propose a strategy to facilitate excitons dissociation by molecular regulation induced built-in electric field(BIEF). The electron-rich pyrimidine-ring into CCN changes the charge density distribution over heptazine-rings to induce BIEF between melon chains. Such BIEF is sufficient to overcome the considerable exciton binding energy(EBE) and reduce it from 38.4 meV to 16.4 meV,increasing the excitons dissociation efficiency(EDE) from 21.5% to 51.9%. Our results establish a strategy to facilitate excitons dissociation through molecular regulation induced BIEF, targeting the intrinsic high EBE and low EDE of polymer photocatalysts.

关键词： Crystalline carbon nitride Exciton binding energy Built-in electric field Pyrimidine donor Excitons dissociation

Symmetry energy dependence of the pygmy and giant dipole resonances in an isospin dependent quantum molecular dynamics model

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Nuclear Science and Techniques 2013年第3期24卷 55-60页

作者： TAO Cheng MA Yugang zhang guoqiang CAO Xiguang FANG Deqing WANG Hongwei Shanghai Institute of Applied Physics Chinese Academy of SciencesJiading Campus University of Chinese Academy of Sciences

Isospin-dependent Quantum Molecular Dynamics model (IQMD) has been applied to investigate the Pygmy Dipole Resonance (PDR) and Giant Dipole Resonance (GDR) in Ni isotopes by Coulomb excitation. By Gaussian fitting to the photon emission spectra, the peak energies and strengths of PDR and GDR are extracted. Their sensitivities to impact parameter, incident energy and the symmetry energy are discussed. By the comparison of energy-weighted sum rule (EWSR) with the data and other calculations for 68 Ni, the parameters of density-dependence of symmetry energy in the IQMD are constrained. In addition, the N/Z dependence of PDR and GDR parameters of Ni isotopes are investigated, and the results that the EWSR increases linearly with the N/Z are obtained.

关键词：量子分子动力学模型巨偶极共振同位旋相关对称能能源侏儒 IQMD 峰值能量

Integrating local and partial network view for routing on scale-free networks

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Science China(Information Sciences) 2013年第10期56卷 117-126页

作者： TANG MingDong zhang guoqiang SUN Yi LIU JianXun YANG Jing LIN Tao Key Lab of Knowledge Processing and Networked Manufacturing Hunan University of Science and Technology School of Computer Science and Technology Nanjing Normal University Institute of Computing Technology Chinese Academy of Sciences China Mobile Research Institute Institute of Acoustics Chinese Academy of Sciences

Traditional routing schemes,such as OSPF,optimize data plane routing efciency by maintaining full view of the network at the control ***,maintaining full network view and handling frequent routing information updates are costly in large-scale complex networks,which are considered to be the root causes for the routing scalability ***,it is suggested that routing on local or partial information is plausible if slight performance degradation is *** paper proposes a routing scheme,operating on an integrated network view at each node that consists of its local neighborhood and a globally unique skeleton *** scheme signifcantly reduces storage,communication and processing *** scale-free networks,this beneft only comes at the cost of marginal performance degradation,which implies that it is not worthwhile to do shortest path routing based on full view of the network on scale-free *** contrast,the routing efciency is severely aggravated on purely random networks,indicating the inappropriateness of this scheme and the rationality of maintaining full network view on random networks.

关键词： routing scale-free networks complex networks power-law

Effect of defects on photocatalytic activity of rutile TiO2 nanorods

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Nano Research 2015年第12期8卷 4061-4071页

作者： Zhao Zhao Xiaoyan zhang guoqiang zhang Zhenyu Liu Dan Qu Xiang Miao Pingyun Feng Zaicheng Sun State Key Laboratory of Luminescence and Applications Changchun Institute of Optics Fine Mechanics and Physics CAS.3888 East Nanhu Road Changchun 130033 China Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical Engineering Beijing University ot Technology Beijing 100124 China University of Chinese Academy of Sciences No. 19A Yuquan Road Beijing 100049 China Department of Chemistry University of California Riverside CA 92521 USA

To further understand the effect of structural defects on the electrochemical and photocatalytic properties of TiO2, two synthetic approaches based on hydrothermal synthesis and post-synthetic chemical reduction to achieve oxygen defect- implantation were developed herein. These approaches led to the formation of TiO2 nanorods with uniformly distributed defects in either the bulk or on the surface, or the combination of both, in the formed TiO2 nanorods （NRs）. Both approaches utilize unique TiN nanoparticles as the reaction precursor. Electron microscopy and Brunauer-Emmett-Teller （BET） analyses indicate that all the studied samples exhibit similar morphology and similar specific surface areas. X-ray photoelectron spectroscopy （XPS） and electron paramagnetic resonance （EPR） data confirm the existence of oxygen defects （Vo）. The photocatalytic properties of TiO2 with different types of implanted Vo were evaluated based on photocatalytic H2 production. By optimizing the concentration of Vo among the TiO2 NRs subjected to different treatments, significantly higher photocatalytic activities than that of the stoichiometric TiO2 NRs was achieved. The incident photon-to-current efficiency （IPCE） data indicate that the enhanced photocatalytic activity arises mainly from defect-assisted charge separation, which implies that photo-generated electrons or holes can be captured by Vo and suppress the charge recombination process. The results show that the defective TiO2 obtained by combining the two approaches exhibits the greatest photocatalytic activity enhancement amon~ all the samples.

关键词： TiO2 oxygen vacancies photocatalytic H2 generation defects charge separation

烟梗化学组分分析及其制浆与配抄纸张性能研究

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中国造纸 2024年第7期43卷 64-73页

作者：潘鹏宇施建在李安琪陈欣杨伟凯张静楠陈礼辉李建国张国强福建农林大学材料工程学院植物纤维功能材料国家林和草原局重点实验室福建福州350108 福建金闽再造烟叶发展有限公司福建福州350600 福建中烟工业有限责任公司福建厦门361012

本研究通过水热预处理-机械磨浆方式制备烟梗纸浆纤维,并与漂白硫酸盐阔叶木浆配抄纸张。烟梗化学组分析表明,烟梗原料中木质素和综纤维素含量较低(木质素含量为5%~8%、综纤维素含量为29%~35%)、抽出物和灰分含量较高(抽出物含量>50%、... 详细信息

本研究通过水热预处理-机械磨浆方式制备烟梗纸浆纤维,并与漂白硫酸盐阔叶木浆配抄纸张。烟梗化学组分析表明,烟梗原料中木质素和综纤维素含量较低(木质素含量为5%~8%、综纤维素含量为29%~35%)、抽出物和灰分含量较高(抽出物含量>50%、灰分含量为~15%),比较适宜制备机械浆纤维。探究水热预处理条件、H_(2) O_(2)漂白工艺参数以及配抄条件对烟梗纤维和纸张性能的影响。结果表明,80℃、90 min的水热预处理后通过H_(2) O_(2)漂白60 min(H_(2) O_(2)用量3%),可以制备纤维重均长度为0.395 mm、重均宽度为32.3µm、扭结角为98°、卷曲指数为15.3%的烟梗浆纤维;利用制备的烟梗浆纤维与漂白硫酸盐阔叶木浆在质量比3∶7配抄条件下,所制纸张松厚度、白度、不透明度、撕裂指数和抗张指数分别为1.68 cm^(3)/g、62.1%、94.6%、5.92 mN·m^(2)/g和33.8 N·m/g。

关键词：烟梗原料漂白硫酸盐阔叶木浆纤维形态物理性能

A state-of-the-art review on shallow geothermal ventilation systems with thermal performance enhancement-system classifications,advanced technologies and applications

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Energy and Built Environment 2023年第2期4卷 148-168页

作者： Zhengxuan Liu Mingjing Xie Yuekuan Zhou Yingdong He Lei zhang guoqiang zhang Dachuan Chen College of Civil Engineering National Center for International Research Collaboration in Building Safety and EnvironmentHunan UniversityChangsha410082China Faculty of Architecture and The Built Environment Delft University of TechnologyJulianalaan 1342628 BLDelftthe Netherlands School of Architecture and Art Central South UniversityChangsha410012China Sustainable Energy and Environment Thrust Function HubThe Hong Kong University of Science and TechnologyGuangzhouChina Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayHong Kong SARChina Center for the Built Environment University of CaliforniaBerkeleyBerkeleyCAUSA Xuhui Design Co. LtdZhengzhou 450018China

Geothermal energy with abundance and large quantity can partially cover building heating/cooling loads and promote the carbon-neutrality *** geothermal ventilation(SGV)system,with a little initial in-vestment cost,is one of promising technologies to partly replace the conventional air-conditioning system for air pre-cooling/*** paper reviews applications of SGV system for improving thermal performance over latest two decades,which mainly includes the reclassification of SGV system,coupling with other advanced energy-saving technologies,application potentials for building cooling/heating under various weather *** transfer mechanism and mathematical modelling techniques have been reviewed,together with in-depth analysis on current research trends,existing limitations,and recommendations of SGV *** change materials,with considerable latent energy density,can stabilize the thermal performance with high *** review identifies that optimization designs and advanced approaches need to be investigated to address the existing urgent issues of SGV system(e.g.,large land occupation,difficulty in centralized collection of condensate water timely for horizontal buried pipe,bacteria growth,polluted supply air,and high construction cost for ver-tical buried pipe).A plenty of studies show that the SGV system could greatly expand the application scope and improve system energy efficiency by combining with other energy-saving *** paper will provide some guidelines for the scientific researchers and engineers to keep track on recent advancements and research trends of SGV system for the building thermal performance enhancement and pave path for future research works.

关键词： Geothermal energy Shallow geothermal ventilation Building thermal performance enhancement Energy saving Cooling/heating

Observation of negative differential resistance in diketopyrrolopyrrole-based copolymer films

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Science China Chemistry 2011年第4期54卷 636-640页

作者： YANG LiGong XU Hao zhang guoqiang WANG Mang LI Yang CHEN HongZheng State Key Laboratory of Silicon Materials Zhejiang-California International Nanosystems Institute Zhejiang UniversityHangzhou 310027China MOE Key Laboratory of Macromolecule Synthesis & Functionalization Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China

Remarkable and repeatable negative differential resistance (NDR) phenomenon was observed in a metal-polymer-metal structure diode based on bishexyloxy-divinyl-benzene-alt-diketopyrrolopyrrole (C6DPPPPV),a type of donor-acceptor (D-A) conjugated *** dependence of the devices implied that the observed NDR characteristics were *** device performance was considered to depend on the slow trapping and releasing processes related to the local deep states,which was enhanced by the growth and thermal rupture of conducting filaments through the organic *** results suggest that the D-A conjugated copolymer is a promising memory material based on NDR effect.

关键词： negative differential resistance donor-acceptor conjugated copolymer memories

Combined use of choledochoscope and duodenoscope in treatment of bile peritonitis after removal of T-tube

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Hepatobiliary & Pancreatic Diseases International 2006年第4期5卷 624-626页

作者： guoqiang zhang YuHui zhang ChaoMin Shen JinRong Liang Department of Hepatobiliary Surgery People's Hospital of Zhoushan Zhoushan 316000 China.

BACKGROUND:Biliary leakage after removal of a T-tube has significant morbidity and mortality. Its etiology is multifactorial. The treatment and outcome of this complication vary. In the present study we evaluated the procedures and efficacy of combined use of choledochoscope and duodenoscope in the treatment of bile peritonitis after T-tube removal.;METHODS:The procedures and results of 11 cases of biliary leakage after removal of T-tube who had been treated from January 1998 to June 2004 by combined use of choledochoscope and duodenoscope were analyzed retrospectively.;RESULTS:After the treatment, 9 patients were cured, and 2 were reoperated on and cured.;CONCLUSIONS:Biliary leakage after removal of T-tube can be cured successfully by combined use of choledochoscope and duodenoscope. Importantly, the method is simple, effective and safe, and mostly reoperation can be avoided.

关键词： biliary leakage combined treatment T-tube choledochoscope duodenoscope