检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

常见干字型输电塔地震易损性分析

华北地震科学 2024年第3期42卷 11-16页

作者：陈刚王郁李茂峰刘波陈强唐勇岑关李小军荣棉水中国南方电网有限责任公司超高压输电公司百色局广西百色533000 北京工业大学城市与工程安全减灾教育部重点实验室北京100124

为了研究输电塔-线体系中输电塔破坏的问题,根据某实际输电塔进行有限元建模,基于分析结果确定并定义损伤状态极限,选择20条地震动记录进行调幅,使用增量动力分析方法,以输电塔主材和斜材的杆件节间相对位移角为地震需求参数,地震动峰... 详细信息

为了研究输电塔-线体系中输电塔破坏的问题,根据某实际输电塔进行有限元建模,基于分析结果确定并定义损伤状态极限,选择20条地震动记录进行调幅,使用增量动力分析方法,以输电塔主材和斜材的杆件节间相对位移角为地震需求参数,地震动峰值加速度为强度参数,通过IDA分析方法得到输电塔的易损性曲线,对输电塔进行震害分析。通过体系中输电塔的易损性曲线可以与输电塔单塔的易损性曲线进行对比,得到塔-线体系耦连对输电塔的影响。

关键词：实际输电塔震害增量动力分析地震易损性

Stabilized quantum coherence and remote state preparation in structured environments

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第29期59卷 3841-3846页

作者： Ping Zhang bo You Li-Xiang cen center of Theoretical Physics College of Physical Science and TechnologySichuan University

The radiation decay of a two-level atom could be inhibited within structured environments even under longtime *** investigate the stabilized quantum coherence of composite systems undergoing local dissipation and exploit it further as a resource for remote state *** focus on outputs of quantum states with solely quantum discord(i.e.,without entanglement)and demonstrate that they could be resulted from various initial states providing specific spectral structure of the *** detail,we elaborate the behavior of stabilized quantum discord and the corresponding fidelity for remote state preparation in connection with structural spectra of Ohmic class reservoir and of photonic band gap mediums.

关键词：远程态制备量子相干性结构化环境稳定初始状态二能级原子复合系统储层结构

三种机器学习算法预测心力衰竭死亡的价值研究

在线全文

学校读者我要写书评

暂无评论

医学信息 2024年第11期37卷 11-15页

作者：陈晓彤岑梓熹谭静仪栾雅彭师师严波何震广州新华学院健康学院江苏科技大学材料工程学院

目的用机器学习三种不同算法建立心力衰竭分类预测模型，比较模型的准确率，并分析心力衰竭死亡事件重要性特征，对人群尽早发现和实施介入措施提供援助，努力提高人们的健康水平和生活质量。方法使用Kaggle平台发布的心力衰竭数据集... 详细信息

目的用机器学习三种不同算法建立心力衰竭分类预测模型，比较模型的准确率，并分析心力衰竭死亡事件重要性特征，对人群尽早发现和实施介入措施提供援助，努力提高人们的健康水平和生活质量。方法使用Kaggle平台发布的心力衰竭数据集，通过缺失值填充法、数据标准化处理、SMOTE方法进行数据预处理。基于随机森林、C4.5、Adaboost算法建立心力衰竭预测模型。使用性能评估指标混淆矩阵、ROC曲线、均方根误差以及均值绝对误差评估评价模型性能。结果 PermutationImportance给出的变量重要性排序中，血清肌酐水平、年龄、血清钠离水平排序靠前。三种模型中，随机森林模型准确率为85%，精确率为81%，召回率为68%;C4.5模型准确率为83%，精确率为80%，召回率为63%;Adaboost模型准确率为80%，精确率为71%，召回率为63%。结论基于所用数据集，随机森林模型优于C4.5模型与Adaboost模型，心力衰竭死亡风险预测模型能为心力衰竭早期预防控制及诊断提供参考依据。

关键词：心力衰竭死亡预测模型 C4.5 随机森林 Adaboost

Simultaneous removal of ethyl acetate, benzene and toluene with gliding arc gas discharge

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第5期9卷 695-701页

作者： Zheng bo Jian-hua YAN Xiao-dong LI Yong CHI Ke-fa cen State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

The simultaneous removal of ethyl acetate, benzene and toluene with relatively low or high initial concentration is studied using a laboratory scale gliding arc gas discharge (GA) reactor. Good decomposition efficiencies are obtained which proves that the GA is effective for the treatment of volatile organic compounds (VOCs) with either low or high concentration. A theoretical decomposition mechanism is proposed based on detection of the species in the plasma region and analysis of the decomposition by-products. This preliminary investigation reveals that the GA has potential to be applied to the treatment of exhaust air during color printing and coating works, by either direct removal or combination with activated carbon adsorption/desorption process.

关键词：等离子体滑动性能气体放电挥发性有机化合物

Shell-model study on properties of proton dripline nuclides with Z,N=30-50 including uncertainty analysis

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第8期46卷 196-210页

作者：蔡博帅陈广尚袁岑溪何建军 Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Key Laboratory of Beam Technology and Materials Modification of Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Beijing Radiation center Beijing 100875China

The binding and proton separation energies of nuclides with Z,N=30-50 are investigated based on the shell model,with an uncertainty analysis via statistical *** formulas are used to obtain the binding and proton separation energies according to shell-model *** non-parametric bootstrap method is applied to establish an uncertainty decomposition and recomposition ***,this is used to estimate the stability of proton(s) emission for each *** formulas for calculating the binding energies with a systematic uncertainty of~0.3 Me V are proposed,and a reliable extrapolation ability is *** binding energy formulas deduce similar forms for their respective S_(p) and S_(2 p) energies,which predict the extension of the nuclear boundary of this region.A good description of the binding and proton separation energies is *** one-and twoproton separation energies and partial half-lives of proton emission are predicted,thus revealing a new ***,there are 30 unstable nuclides predicted to be bound against proton(s)-*** nuclear properties will be useful in nuclear astrophysics.

关键词： shell model proton dripline uncertainty analysis

Flow behavior of high-temperature flue gas in the heat transfer chamber of a pilot-scale coal-water slurry combustion furnace

在线全文

学校读者我要写书评

暂无评论

Particuology 2014年第6期12卷 114-124页

作者： Yanwei Zhang Yu bo Yingchun Wu Xuecheng Wu Zhenyu Huang Junhu Zhou Kefa cen State Key Laboratory of Clean Energy Utilization Zhejiang University

The flow characteristics of high-temperature flue gas are important in the heat transfer of coal-water slurry（CWS） combustion *** flow field of a 250 kg/h vertical-type slag tap cyclone furnace was non-intrusively investigated,using two-dimensional particle-image velocimetry（2D PIV）.The method was verified using traceable fly ash particles in high-temperature flue *** flow field of the flue gas was analyzed with a time-averaged method,based on which the effects of excess air ratio and loading were *** flue gas separated by a gas separator maintained good rigidity near the furnace wall,rather than eroding the heating *** simulations validated the reliability of PIV under the actual circumstances within the *** study provides guidelines for applying 2D PIV in analyzing flue gas in thermal test boilers.

关键词： PIV cws Flow field High-temperature flue gas Slag tap cyclone furnace

Design of Supercapacitor Electrodes Using Molecular Dynamics Simulations

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2018年第2期10卷 162-184页

作者： Zheng bo Changwen Li Huachao Yang Kostya Ostrikov Jianhua Yan Kefa cen State Key Laboratory of Clean Energy Utilization College of Energy Engineering Zhejiang University School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology Joint CSIRO-QUT Sustainable Processes and Devices Laboratory

Electric double-layer capacitors(EDLCs) are advanced electrochemical devices for energy storage and have attracted strong interest due to their outstanding properties. Rational optimization of electrode–electrolyte interactions is of vital importance to enhance device performance for practical applications. Molecular dynamics(MD) simulations could provide theoretical guidelines for the optimal design of electrodes and the improvement of capacitive performances, e.g., energy density and power density. Here we discuss recent MD simulation studies on energy storage performance of electrode materials containing porous to nanostructures. The energy storage properties are related to the electrode structures, including electrode geometry and electrode modifications. Altering electrode geometry, i.e., pore size and surface topography,can influence EDL capacitance. We critically examine different types of electrode modifications, such as altering the arrangement of carbon atoms, doping heteroatoms and defects, which can change the quantum capacitance. The enhancement of power density can be achieved by the intensified ion dynamics and shortened ion *** control of the electrode morphology helps improve the ion dynamics by decreasing the ion diffusion pathway. Tuning the surface properties(e.g., the affinity between the electrode and the ions) can affect the ionpacking phenomena. Our critical analysis helps enhance the energy and power densities of EDLCs by modulating the corresponding electrode structures and surface properties.

关键词： Electric double-layer capacitors Molecular dynamics Porous structure Nanostructure

Preliminary studies of constructing a tissue-engineered lamellar corneal graft by culturing mesenchymal stem cells onto decellularized corneal matrix

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2021年第1期14卷 10-18页

作者： Yu-Jie cen De-bo You Wei Wang Yun Feng Department of Ophthalmology Peking University Third HospitalBeijing 100191China Beijing Key Laboratory of Restoration of Damaged Ocular Nerve Peking University Third HospitalBeijing 100191China

AIM:To construct a competent corneal lamellar substitute in order to alleviate the shortage of human corneal ***:Rabbit mesenchymal stem cells(MSCs)were isolated from bone marrow and identified by flow cytometric,osteogenic and adipogenic *** decellularized corneal matrix(XDCM)was generated from dog *** were seeded and cultured on XDCM to construct the tissueengineered ***-transplantation biocompatibility of engineered corneal graft were tested by animal *** were divided into two groups then underwent lamellar keratoplasty(LK)with different corneal grafts:1)XDCM group(n=5):XDCM;2)XDCM-MSCs groups(n=4):tissue-engineered cornea made up with XDCM and *** ocular surface recovery procedure was observed while corneal transparency,neovascularization and epithelium defection were measured and *** vivo on focal exam was performed 3 mo ***:Rabbit MSCs were isolated and *** cytometry demonstrated isolated cells were CD90 positive and CD34,CD45 *** and adipogenic induction verified their multipotent ***-XDCM grafts were constructed and *** vivo transplantation showed the neovascularization in XDCMMSC group was much less than that in XDCM group ***-transplant 3-month confocal test showed less nerve regeneration and bigger cell-absent area in XDCM-MSC ***:This study present a novel corneal tissue-engineered graft that could reduce post-operatively neovascularization and remain transparency,meanwhile shows that co-transplantation of MSCs may help increase corneal transplantation successful rate and enlarge the source range of corneal substitute to overcome cornea donor shortage.

关键词： mesenchymal stem cells xenogenic decellularized corneal matrix acellular corneal matrix neovascularization tissue-engineered cornea

Graphene Array-Based Anti-fouling Solar Vapour Gap Membrane Distillation with High Energy Efficiency

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2019年第3期11卷 249-262页

作者： Biyao Gong Huachao Yang shenghao Wu Guoping Xiong Jianhua Yan Kefa cen Zheng bo Kostya Ostrikov State Key Laboratory of Clean Energy Utilization College of Energy EngineeringZhejiang UniversityHangzhou310027ZhejiangPeople’s Republic of China Department of Mechanical Engineering University of NevadaRenoNV89557USA Joint CSIRO-QUT Sustainable Processes and Devices Laboratory P.O.Box218LindfieldNSW2070Australia School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQLD4000Australia

Photothermal membrane distillation(MD)is a promising technology for desalination and water ***,solar-thermal conversion suffers from low energy efficiency(a typical solar-water efficiency of ~50%),while complex modifications are needed to reduce membrane ***,we demonstrate a new concept of solar vapour gap membrane distillation(SVGMD)synergistically combining self-guided water transport,localized heating,and separation of membrane from feed solution.A free-standing,multifunctional light absorber based on graphene array is custom-designed to locally heat the thin water layer transporting through graphene *** as-generated vapour passes through a gap and condenses,while salt/contaminants are rejected before reaching the *** high solar-water efficiency(73.4% at 1 sun),clean water collection ratio(82.3%),excellent anti-fouling performance,and stable permeate flux in continuous operation over 72 h are simultaneously ***,SVGMD inherits the advantage of MD in microorganism removal and water collection,enabling the solar-water efficiency 3.5 times higher compared to state-of-the-art solar vapour systems.A scaled system to treat oil/seawater mixtures under natural sunlight is developed with a purified water yield of 92.8 kg m-2 *** results can be applied for diverse mixed-phase feeds,leading to the next-generation solar-driven MD technology.

关键词： Solar energy Plasma-made nanostructures Photothermal conversion Water purification