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支链氨基酸与衰老和老年人健康的关系

华西医学 2024年第8期39卷 1327-1332页

作者：蒲琳文曰卢春燕陈亿四川大学华西医院普外科胃肠外科病房成都610041

骨骼肌以及机体代谢功能是影响老年人健康状态的重要因素。支链氨基酸(branched-chain amino acid,BCAA)可以改善肌肉恢复,减少运动后的肌肉酸痛,同时BCAA还可以改善代谢健康,有助于调节老年人的血糖水平和提高胰岛素敏感性。此外,BCAA... 详细信息

骨骼肌以及机体代谢功能是影响老年人健康状态的重要因素。支链氨基酸(branched-chain amino acid,BCAA)可以改善肌肉恢复,减少运动后的肌肉酸痛,同时BCAA还可以改善代谢健康,有助于调节老年人的血糖水平和提高胰岛素敏感性。此外,BCAA还可以改善认知功能,降低与年龄相关的认知能力下降的风险。该文综述了BCAA与衰老、骨骼肌及代谢性疾病的关系,阐述了BCAA可以支持和促进老年人的肌肉质量和功能,还可以对代谢健康和认知功能产生积极影响。

关键词：支链氨基酸衰老骨骼肌代谢性疾病

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Charge Accumulation Characteristics of SF6-Epoxy Interface Under Negative Repetitive Nanosecond Pulses

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1808-1815页

作者： Shaocong Wu Geng chen Yuming Shao Hao Xu Xuanning Zhang Yanyu Liang Youping Tu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and the Beijing Key Laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China

Repetitve nanosecond impulses in gas-insulated metal-enclosed switchgear (GIS) are likely to trigger inside flashover. Interface charges on the spacer in GIS are considered one of the main factors damaging insulation performance and may be induced by overvoltage. For good understanding of insulation failures, accumulation characteristics of charges between SF6 and epoxy spacers under repetitive nanosecond impulses are investigated. It can be found under nanosecond impulses, the charge source in gas volume contributes to interface charge accumulation predominantly. Interface charges will be promoted by impulse number and amplitude. Accumulation processes are analyzed based on runaway electrons mechanism. When impulse amplitude exceeds a threshold value, discharge in the gas volume turns to a runaway mode. A runaway electron leads to the interface charge accumulation. Affected by motion of the runaway electrons, the potential peak gradually moves close to the grounded electrode when impulse amplitude is raised. Meanwhile, increasing impulse number can enhance surface potential. Surface potential will reach saturation eventually. However, memory effect of the repetitive impulse discharge makes the half-peak width of the surface potential at the interface change little. Design of GIS gas-solid insulations can refer to this research.

关键词： GIS interface charge repetitive nano-second pulse SF6

Uncertainty-Aware Physical Simulation of Neural Radiance Fields for Fluids

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 1143-1163页

作者： Haojie Lian Jiaqi Wang Leilei chen Shengze Li Ruochen Cao Qingyuan Hu Peiyun Zhao Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education Taiyuan University of TechnologyTaiyuan030024China Henan International Joint Laboratory of Structural Mechanics and Computational Simulation College of Architectural and Civil EngineeringHuanghuai UniversityZhumadian463000China National Innovation Institute of Defense Technology Academy of Military ScienceBeijing100091China School of Software Taiyuan University of TechnologyJinzhong030600China School of Science Jiangnan UniversityWuxi214122China

This paper presents a novel framework aimed at quantifying uncertainties associated with the 3D reconstruction of smoke *** approach reconstructs color and density fields from 2D images using Neural Radiance Field(NeRF)and improves image quality using frequency *** NeRF model is obtained via joint training ofmultiple artificial neural networks,whereby the expectation and standard deviation of density fields and RGB values can be evaluated for each *** addition,customized physics-informed neural network(PINN)with residual blocks and two-layer activation functions are utilized to input the density fields of the NeRF into Navier-Stokes equations and convection-diffusion equations to reconstruct the velocity *** velocity uncertainties are also evaluated through ensemble *** effectiveness of the proposed algorithm is demonstrated through numerical *** presentmethod is an important step towards downstream tasks such as reliability analysis and robust optimization in engineering design.

关键词： Uncertainty quantification neural radiance field physics-informed neural network frequency regularization twolayer activation function ensemble learning

有限场地内立井施工地面布置与设备选型方案研究

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建井技术 2024年第2期45卷 6-9页

作者：陈弦王箫张书胤温永亮陕西煤业化工建设(集团)有限公司陕西西安710021

针对陕煤建庄煤矿回风立井井筒施工时场地狭小、距离既有建筑物近等现场条件,通过计算与分析制定了双绞车单侧布置、单侧排矸的地面布置方案;根据井筒工程特征确定了井筒施工的相关配套设备,并验算了整体井架在工作时的稳定性;同时对爆... 详细信息

针对陕煤建庄煤矿回风立井井筒施工时场地狭小、距离既有建筑物近等现场条件,通过计算与分析制定了双绞车单侧布置、单侧排矸的地面布置方案;根据井筒工程特征确定了井筒施工的相关配套设备,并验算了整体井架在工作时的稳定性;同时对爆破作业对既有建筑物的振动影响进行了验算,确定了不同井筒深度施工时的一次起爆最大药量,并制定了相应的减震措施。通过实践表明,在有限场地内采取双提升单侧布置的施工方案是可行的,能够保证安全生产,为类似条件的井筒施工提供了借鉴经验。

关键词：矿井建设有限场地井筒施工爆破绞车

Screening current in ultra-high-field non-insulated superconducting magnets

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Science China(Technological Sciences) 2024年第7期67卷 2255-2273页

作者： ZHOU BenZhe WANG Lei chen Yong WANG QiuLiang WANG KangShuai ZHANG ZiLi LIU JianHua University of Chinese Academy of Sciences Beijing 100049China Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China

Screening current is recognized as one of the critical elements limiting the progression of superconducting magnets toward achieving higher magnetic fields. Currently, most non-insulated(NI) superconducting magnets consider the magnet as insulated when addressing the issue of screening current. However, the bypass current in the NI magnet can modify the actual history of magnetization, so the screening current in NI magnet will be different from that in the insulated magnet. This paper presents a novel method based on the homogenized T-A formulation(T is the current vector potential, and A is the magnetic vector potential), which enables real-time simulation of both the bypass current behavior and the implications of screening current in NI superconducting magnets, even when these magnets contain tens of thousands of turns. We have developed a 32 T NI hybrid superconducting magnet and validated the effectiveness of this method through experiments. Employing this efficacious method,we conducted a comprehensive calculation of screening current in NI magnets, comparing them with insulated magnets in terms of screening current-induced stress(SCIS), screening current-induced field(SCIF), and losses. The results indicate that in the NI insert coils, the sequential excitation of background coils and insert coils induces a reverse screening current, resulting in slightly lower SCIF and SCIS compared to those in the insulated magnets. The method and results can contribute to the enhancement of magnet design and provide valuable insights for the development of ultra-high fields(UHF) NI magnets.

关键词： ultra-high-field superconducting magnet screening current REBCO coil NI coil stress loss

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Geographical Information Visualization on a Panoramic Sphere in an Immersive Environment

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Journal of Ocean University of China 2023年第4期22卷 961-974页

作者： MA Ying TIAN Fenglin LIU wen TANG Moran LI Jinyu chen Ge Frontiers Science Center for Deep Ocean Multispheres and Earth System School of Marine TechnologyOcean University of ChinaQingdao 266100China Laboratory for Regional Oceanography and Numerical Modeling Laoshan LaboratoryQingdao 266100China Faculty of Information Science and Engineering Ocean University of ChinaQingdao 266100China

In this paper,we propose a novel approach to visualizing global geographical information:a panoramic sphere in an immersive *** whole geographical surface can be observed through the rotating of heads as the viewpoint of the panoramic sphere is inside the *** compared three approaches to visualizing the earth for rendering the geographical information in a virtual reality *** the tasks of terrestrial and marine geographical information,we compare the visualization effects on a)a globe,b)a flat map and c)a panoramic *** geographical information tasks include the area comparison and direction *** geographical information tasks contain the visualization of sea surface temperature and sea surface *** terrestrial geographical information tasks,the experimental results show that the panoramic sphere outperforms the globe and the flat map,with a higher average accuracy and a shorter *** marine geographical information task,the panoramic sphere visualization is also superior to the flat map and the globe in an immersive environment for the sea surface temperature data and the sea surface current *** all three visualization experiments,the panoramic sphere is most preferred by the participants,particularly for global,transcontinental and transoceanic needs.

关键词： the panoramic sphere immersive environment virtual reality oceanographic information visualization

A Survey on Blockchain-Based Federated Learning:Categorization,Application and Analysis

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 2451-2477页

作者： Yuming Tang Yitian Zhang Tao Niu Zhen Li Zijian Zhang Huaping chen Long Zhang School of Cyberspace Science&Technology Beijing Institute of TechnologyBeijing100081China School of Computer Science&Technology Beijing Institute of TechnologyBeijing100081China Southeast Institute of Information Technology Beijing Institute of TechnologyPutian351100China Qianxin Technology Group Co. Ltd.Beijing100044China

Federated Learning(FL),as an emergent paradigm in privacy-preserving machine learning,has garnered significant interest from scholars and engineers across both academic and industrial *** its innovative approach to model training across distributed networks,FL has its vulnerabilities;the centralized server-client architecture introduces risks of single-point ***,the integrity of the global model—a cornerstone of FL—is susceptible to compromise through poisoning attacks by malicious *** attacks and the potential for privacy leakage via inference starkly undermine FL’s foundational privacy and security *** these reasons,some participants unwilling use their private data to train a model,which is a bottleneck in the development and industrialization of federated *** technology,characterized by its decentralized ledger system,offers a compelling solution to these *** inherently prevents single-point failures and,through its incentive mechanisms,motivates participants to contribute computing ***,blockchain-based FL(BCFL)emerges as a natural progression to address FL’s *** study begins with concise introductions to federated learning and blockchain technologies,followed by a formal analysis of the specific problems that FL *** discusses the challenges of combining the two technologies and presents an overview of the latest cryptographic solutions that prevent privacy leakage during communication and incentives in *** addition,this research examines the use of BCFL in various fields,such as the Internet of Things and the Internet of ***,it assesses the effectiveness of these solutions.

关键词： Federated learning blockchain privacy-preserving

不同呈现方式对城市公园自然体验的疗愈效益的影响研究

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艺术与设计（理论版） 2024年第3期 65-69页

作者：张一嵩郝石盟王晨侯锐陈文北京建筑大学建筑与城市规划学院北京100044 北京市新安教育矫治所北京100028 中国电子工程设计院股份有限公司北京100089

城市公园的自然体验有助于缓解城市人口的生活压力,提高他们的幸福感和生活质量。随着媒体技术的发展,越来越多的研究表明,观看自然景观的2D和360°全景照片或视频也有助于改善人们的身心健康水平。然而,目前缺乏关于不同呈现方式对观... 详细信息

城市公园的自然体验有助于缓解城市人口的生活压力,提高他们的幸福感和生活质量。随着媒体技术的发展,越来越多的研究表明,观看自然景观的2D和360°全景照片或视频也有助于改善人们的身心健康水平。然而,目前缺乏关于不同呈现方式对观看体验影响的研究。因此,本研究设计了一个随机对照实验,以确定不同类型的虚拟公园体验对参与者情绪疗愈效益和恢复性的效果。结果表明:(1)不同自然场景都能缓解参与者的负面情绪,提升他们对场景的恢复性感知。其中,对紧张、易怒和烦躁不安的缓解最为明显。(2)虚拟现实(VR)场景中的虚拟自然体验通常优于2D屏幕场景。(3)360°静态场景的放松效果是最理想的,也最适合作为身心疗愈场景。此外,360°动态场景更容易引起人们的好奇和探索,但也让参与者感到更疲劳。研究结果为虚拟自然疗愈的应用提供了实际证据,表明应灵活使用不同的呈现方式和疗愈内容来应对各种疗愈需求。

关键词：虚拟现实沉浸体验自然体验减压情绪恢复

卵巢-附件超声报告和数据系统分类联合超声图像特征对卵巢附件良恶性肿块的鉴别诊断价值

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癌症进展 2024年第10期22卷 1067-1070页

作者：陈伟萍温家霖黄琳赵雅广东省第二中医院超声科广州510095 广州医科大学药学院广州5114360

目的探讨卵巢-附件超声报告和数据系统(O-RADS)分类联合超声图像特征对卵巢附件良恶性肿块的鉴别诊断价值。方法选取O-RADS分类为3~5类的140例卵巢附件肿块患者,所有患者均接受彩色多普勒超声检查。以病理检查结果为金标准,绘制受试... 详细信息

目的探讨卵巢-附件超声报告和数据系统(O-RADS)分类联合超声图像特征对卵巢附件良恶性肿块的鉴别诊断价值。方法选取O-RADS分类为3~5类的140例卵巢附件肿块患者,所有患者均接受彩色多普勒超声检查。以病理检查结果为金标准,绘制受试者工作特征曲线,计算曲线下面积(AUC),分析O-RADS分类、多项超声图像特征单独及联合检查对卵巢附件恶性肿块的诊断价值。结果病理检查结果显示,140例患者中共147个卵巢附件肿块,恶性56个(包括交界性肿瘤),良性91个;O-RADS分类3类46个,4类61个,5类40个。O-RADS分类联合肿块实性部分最大径、血流评分、肿块形态诊断卵巢附件恶性肿块的AUC为0.959,高于各指标单独检查的0.738、0.882、0.913、0.894。结论在O-RADS分类定性诊断卵巢附件肿块的基础上,结合肿块实性部分最大径线、血流评分、肿块形态等彩色多普勒超声图像特征可进一步提高卵巢附件良恶性肿块的鉴别诊断效能。

关键词：卵巢-附件超声报告和数据系统卵巢附件肿块良恶性鉴别诊断价值