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螺旋管内超临界CO_(2)对流换热特性数值研究

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当代化工研究 2024年第2期 17-19页

作者：朱旭涛颜建国何丹朱凤岭西安理工大学省部共建西北旱区生态水利国家重点实验室陕西710048

本文模拟了超临界CO_(2)在竖直螺旋管内对流换热过程,研究了质量流速、压力、热流密度等参数对其传热系数的影响,并对比了超临界CO_(2)在螺旋管与直管对流换热性能。结果表明,提高质量流速、降低热流密度能够有效提高换热系数。相比于圆... 详细信息

本文模拟了超临界CO_(2)在竖直螺旋管内对流换热过程,研究了质量流速、压力、热流密度等参数对其传热系数的影响,并对比了超临界CO_(2)在螺旋管与直管对流换热性能。结果表明,提高质量流速、降低热流密度能够有效提高换热系数。相比于圆管,螺旋管能够有效提高超临界CO_(2)对流换热系数,最高平均增幅为11.2%。

关键词：超临界二氧化碳对流换热传热强化螺旋管

Rapid and Sparse Labeling of Neurons Based on the Mutant Virus-Like Particle of Semliki Forest Virus

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Neuroscience Bulletin 2019年第3期35卷 378-388页

作者： Fan Jia xutao zhu Pei Lv Liang Hu Qing Liu Sen Jin Fuqiang Xu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Brain Research Center Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China University of the Chinese Academy of Sciences Beijing 100049China Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of SciencesShanghai 200031China

Sparse labeling of neurons contributes to uncovering their morphology, and rapid expression of a fluorescent protein reduces the experiment range. To achieve the goal of rapid and sparse labeling of neurons in vivo, we established a rapid method for depicting the fine structure of neurons at 24 h post-infection based on a mutant viruslike particle of Semliki Forest virus. Approximately 0.014 fluorescent focus-forming units of the mutant virus-like particle transferred enhanced green fluorescent protein into neurons in vivo, and its affinity for neurons in vivo was stronger than for neurons in vitro and BHK21(baby hamster kidney) cells. Collectively, the mutant virus-likeparticle provides a robust and convenient way to reveal the fine structure of neurons and is expected to be a helper virus for combining with other tools to determine their connectivity. Our work adds a new tool to the approaches for rapid and sparse labeling of neurons in vivo.

关键词： Semliki Forest virus Mutant virus-like particle Rapid labeling Sparse labeling Neuronal morphology

PROXY-BASED PATCHING STREAM TRANSMISSION STRATEGY IN MOBILE STREAMING MEDIA SYSTEM

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Journal of Electronics(China) 2006年第4期23卷 515-519页

作者： Liao Jianxin Lei Zhengxiong Ma xutao zhu Xiaomin State Key Laboratory of Networking and Switching Technology Beo＇ing University of Posts and Telecommunications Beijing 100876 China

A mobile transmission strategy, PMPatching (Proxy-based Mobile Patching) transmission strat-egy is proposed, it applies to the proxy-based mobile streaming media system in Wideband Code Division Multiple Access (WCDMA) network. Performance of the whole system can be improved by using patching stream to transmit anterior part of the suffix that had been played back, and by batching all the demands for the suffix arrived in prefix period and patching stream transmission threshold period. Experimental results show that this strategy can efficiently reduce average network transmission cost and number of channels consumed in central streaming media server.

关键词： Mobile streaming media system Proxy-based Mobile Patching (PMPatching) transmission strategy Patching stream Batching

Rabies Virus Pseudotyped with CVS-N2C Glycoprotein as a Powerful Tool for Retrograde Neuronal Network Tracing

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Neuroscience Bulletin 2020年第3期36卷 202-216页

作者： xutao zhu Kunzhang Lin Qing Liu Xinpei Yue Huijie Mi Xiaoping Huang Xiaobin He Ruiqi Wu Danhao Zheng Dong Wei Liangliang Jia Weilin Wang Anne Manyande Jie Wang Zhijian Zhang Fuqiang Xu Shenzhen Key Lab of Neuropsychiatric Modulation and Collaborative Innovation Center for Brain Science Guangdong Provincial Key Laboratory of Brain Connectome and BehaviorCAS Center for Excellence in Brain Science and Intelligence TechnologyBrain Cognition and Brain Disease Institute(BCBDI)Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research InstitutionsShenzhen 518055China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Key Laboratory of Magnetic Resonance in Biological SystemsWuhan Center for Magnetic ResonanceWuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430071China College of Life Sciences Wuhan UniversityWuhan 430071China School of Human and Social Sciences University of West LondonLondonUK University of the Chinese Academy of Sciences Beijing 100049China

Efficient viral vectors for mapping and manipulating long-projection neuronal circuits are crucial in structural and functional studies of the brain. The SAD strain rabies virus with the glycoprotein gene deleted pseudotyped with the N2 C glycoprotein(SAD-RV(DG)-N2 C(G)) shows strong neuro-tropism in cell culture, but its in vivo efficiency for retrograde gene transduction and neuro-tropism have not been systematically *** compared these features in different mouse brain regions for SAD-RV-N2 C(G) and two other widely-used retrograde tracers, SAD-RV(DG)-B19(G) and r AAV2-retro. We found that SAD-RV(DG)-N2 C(G) enhanced the infection efficiency of long-projecting neurons by^10 times but with very similar neuro-tropism, compared with SAD-RV(DG)-B19(G). On the other hand, SAD-RV(DG)-N2 C(G) had an infection efficiency comparable with r AAV2-retro, but a more restricted diffusion range, and broader tropism to different types and regions of longprojecting neuronal populations. These results demonstrate that SAD-RV(DG)-N2 C(G) can serve as an effective retrograde vector for studying neuronal circuits.

关键词： Viral vector N2C glycoprotein Neuronal circuits Retrograde tracing

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考虑故障的集装箱码头岸桥多阶段再调度决策

系统工程理论与实践 2021年第12期41卷 3321-3335页

作者：郑红星王钟逸朱徐涛大连海事大学交通运输工程学院大连116001

考虑集装箱码头在实际作业中岸桥故障频发,研究了在某集装箱码头确定泊位上单艘船舶的岸桥多阶段再调度问题.针对岸桥故障场景多变的特征,设计了变长滚动的多阶段再调度机制;重点考虑作业岸桥的故障对该船岸桥调度方案的影响,兼顾作业... 详细信息

考虑集装箱码头在实际作业中岸桥故障频发,研究了在某集装箱码头确定泊位上单艘船舶的岸桥多阶段再调度问题.针对岸桥故障场景多变的特征,设计了变长滚动的多阶段再调度机制;重点考虑作业岸桥的故障对该船岸桥调度方案的影响,兼顾作业岸桥装卸过程中不可跨越和保持安全距离等现实条件以及因岸桥故障引起的约束,构建了以岸桥最大完工时间最小为目标的线性规划模型,得出每个滚动阶段决策点处最优的岸桥再调度方案;针对模型的动态性设计了嵌入基因修复和解空间切割的两阶段量子差分进化算法.通过数值实验,验证了方案及算法的有效性,并分析了岸桥故障位置、时机以及出现频次对岸桥调度方案的影响,可为集装箱码头的岸桥调度提供决策支持.

关键词：集装箱码头岸桥故障变长滚动多阶段再调度机制量子差分进化算法

沿河县上覆第四系堆积物下伏泥岩类型滑坡失稳机制分析

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大地测量与地球动力学 2017年第8期37卷 813-818页

作者：汪旭涛王凯朱念中国地震局地震研究所(地震预警湖北省重点实验室) 武汉市洪山侧路40号430071 武汉地震工程研究院武汉市洪山侧路40号430071 中国电建集团昆明勘测设计研究院有限公司昆明市人民东路115号650051

建立小寨滑坡水文地质模型,模拟其在不同降雨条件下的渗流场分布及稳定性变化。结果表明,该类型滑坡的失稳演化过程主要分为上覆Q_4^(el+dl)堆积阶段、接触带泥岩富水风化阶段和风化带富水软化阶段,风化带富水软化程度与滑体的高渗透性... 详细信息

建立小寨滑坡水文地质模型,模拟其在不同降雨条件下的渗流场分布及稳定性变化。结果表明,该类型滑坡的失稳演化过程主要分为上覆Q_4^(el+dl)堆积阶段、接触带泥岩富水风化阶段和风化带富水软化阶段,风化带富水软化程度与滑体的高渗透性和滑床的隔水特性密切相关,是滑坡失稳破坏的决定性因素;滑坡的发生是因地表降雨下渗受阻,在上覆堆积层及下伏泥岩层间形成富水带,富水加速泥岩风化,并在坡体内形成强风化泥岩软弱层,随地质过程持续,泥岩强风化层逐渐加厚形成软弱带,在极端暴雨气候条件下,软弱带发生蠕变,地表开裂,滑坡形成。

关键词：沿河县上覆第四系堆积物下伏泥岩滑坡失稳机制渗流场模拟

Few-shot incremental radar target recognition framework based on scattering-topology properties

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Chinese Journal of Aeronautics 2024年第8期37卷 246-260页

作者： Chenxuan LI Weigang zhu Bakun zhu Yonggang LI Graduate School Space Engineering UniversityBeijing 101400China Department of Electronic and Optical Engineering Space Engineering UniversityBeijing 101400China

The continuous emergence of new targets in open scenarios leads to a substantial decrease in the performance of Inverse Synthetic Aperture Radar(ISAR)recognition ***,data scarcity further exacerbates the challenge of identifying new classes of ISAR *** this paper,a few-shot incremental target recognition framework based on Scattering-Topology Properties(STPIL)is ***,STPIL extracts scattering-topology properties of ISAR targets as recognition ***,the pseudo-incremental training strategy effectively alleviates the algorithm’s forgetting of old knowledge,and improves compatibility with new ***,a feature embedding network,with few parameters,is designed based on the graph neural *** embedding network is highly adaptable to changes in data ***,STPIL fully considers the joint distribution and marginal distribution in scattering features,and uses the Brownian distance metric module to make the scattering-topology features more *** results on both the simulation dataset and the public measured data indicate that STPIL can effectively balance new classes with old classes,and has superior performance to other advanced methods in the incremental recognition of targets.

关键词： Brownian distance metric Graph neural networks Incremental learning Inverse Synthetic Aperture Radar(ISAR) Scattering

Stress-strain relationship for reactive powder concrete with recycled powder under uniaxial compression

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Frontiers of Structural and Civil Engineering 2024年第7期18卷 1015-1027页

作者： Peng zhu Yunming zhu Wenjun QU Liyu XIE College of Civil Engineering Tongji UniversityShanghai 200092China Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education Tongji UniversityShanghai 200092China

The recycled powder(RP)from construction wastes can be used to partially replace cement in the preparation of reactive powder *** this paper,reactive powder concrete mixtures with RP partially replacing cement,and natural sand instead of quartz,are *** curing is used,instead of steam curing that is normally requested by standard for reactive powder *** influences of RP replacement ratio(0%,10%,20%,30%),silica fume proportion(10%,15%,20%),and steel fiber proportion(0%,1%,2%)are *** effects of RP,silica fume,and steel fiber proportion on compressive strength,elastic modulus,and relative absorption energy are analyzed,and theoretical models for compressive strength,elastic modulus,and relative absorption energy are established.A constitutive model for the uniaxial compressive stress-strain relationship of reactive powder concrete with RP is *** the increase of RP replacement ratio from 0% to 30%,the compressive strength decreases by 42% and elastic modulus decreases by 24%.

关键词： recycled powder reactive powder concrete elastic modulus relative absorbed energy stress-strain relationship

Carbon Emission Effects Driven by Evolution of Chinese Dietary Structure from 1987 to 2020

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Chinese Geographical Science 2024年第1期34卷 181-194页

作者： zhu Yuanyuan ZHANG Yan zhu Xiaohua Key Laboratory of Geographic Process Analysis&Simulation Hubei Province Central China Normal UniversityWuhan430079China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing100101China

Exploring carbon emission effects based on the evolution of residents’ dietary structure to achieve the carbon neutrality goal and mitigate climate change is an important *** study took China as the research object(data excluding Hong Kong,Macao and Taiwan) and used the carbon emission coefficient method to quantitatively measure the food carbon emissions from 1987–2020,then analyzed the carbon emission effects under the evolution of dietary *** results showed that during the study period,the Chinese dietary structure gradually changed to a high-carbon consumption *** dietary structure of urban residents developed to a balanced one,while that of rural residents developed to a high-quality *** the study period,the per capita food carbon emissions and total food consumption of Chinese showed an increasing *** per capita food carbon emissions of residents in urban and rural showed an overall upward *** total food carbon emissions in urban increased significantly,while that in rural increased first and then *** influence of beef and mutton on carbon emissions is the highest in dietary *** with the balanced dietary pattern,the food carbon emissions of Chinese residents had not yet reached the peak,but were evolving to a high-carbon consumption pattern.

关键词： dietary structure structural evolution carbon emission effects carbon neutrality China