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Three-dimensional analysis of natural convection in nanofluid-filled parallelogrammic enclosure opened from top and heated with square heater 被引量:1
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作者 Abdullah A.A.A AL-RASHED Walid HASSEN +3 位作者 Lioua KOLSI Hakan F. OZTOP Ali J. CHAMKHA Nidal ABU-HAMDEH 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第5期1077-1088,共12页
A numerical study based on the finite volume method has been performed to study the three-dimension natural convection in a parallelogrammic top side opened cavity filled nanofluid with partially heated square at the ... A numerical study based on the finite volume method has been performed to study the three-dimension natural convection in a parallelogrammic top side opened cavity filled nanofluid with partially heated square at the bottom side.Results are obtained for different governing parameters such as nanoparticle concentration (φ) from 0 to 0.05,inclination angle of the back and front walls (α) from 5° to 75°,Rayleigh number from 10^3 to 10^5,and length of heater changer from 0.1 to 1.The main finding from the obtained result showed that the inclination angle and nanoparticle volume fraction affect the flow structure and enhance the heat transfer. 展开更多
关键词 3D analysis open enclosure partial heating PARALLELOGRAM nanofluids
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Open TBM Tunnel Intelligent Construction Technology 被引量:2
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作者 LIU Yongsheng CHEN Qiao +4 位作者 ZHANG Hepei LI Shu′ao LIN Chungang YIN Long LI Mengyu 《隧道建设(中英文)》 北大核心 2025年第4期816-833,I0025-I0042,共36页
To fully leverage the advantages of mechanization and informatization in tunnel boring machine(TBM)operations,the authors aim to promote the advancement of tunnel construction technology toward intelligent development... To fully leverage the advantages of mechanization and informatization in tunnel boring machine(TBM)operations,the authors aim to promote the advancement of tunnel construction technology toward intelligent development.This involved exploring the deep integration of next-generation artificial intelligence technologies,such as sensing technology,automatic control technology,big data technology,deep learning,and machine vision,with key operational processes,including TBM excavation,direction adjustment,step changes,inverted arch block assembly,material transportation,and operation status assurance.The results of this integration are summarized as follows.(1)TBM key excavation parameter prediction algorithm was developed with an accuracy rate exceeding 90%.The TBM intelligent step-change control algorithm,based on machine vision,achieved an image segmentation accuracy rate of 95%and gripper shoe positioning error of±5 mm.(2)An automatic positioning system for inverted arch blocks was developed,enabling real-time perception of the spatial position and deviation during the assembly process.The system maintains an elevation positioning deviation within±3 mm and a horizontal positioning deviation within±10 mm,reducing the number of surveyors in each work team.(3)A TBM intelligent rail transportation system that achieves real-time human-machine positioning,automatic switch opening and closing,automatic obstacle avoidance,intelligent transportation planning,and integrated scheduling and command was designed.Each locomotive formation reduces one shunter and improves comprehensive transportation efficiency by more than 20%.(4)Intelligent analysis and prediction algorithms were developed to monitor and predict the trends of the hydraulic and gear oil parameters in real time,enhancing the proactive maintenance and system reliability. 展开更多
关键词 TUNNEL open TBM intelligent construction deep learning machine vision
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Call for Papers from Agricultural Products Processing and Storage
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《肉类研究》 北大核心 2025年第9期I0017-I0017,共1页
Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim ... Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim to offer a platform for the rapid dissemination of signifi cant,novel,and high-impact research in the fi elds of agricultural product processing science,technology,engineering,and nutrition.Additionally,supplemental issues are curated and published to facilitate in-depth discussions on special topics. 展开更多
关键词 NUTRITION SCIENCE agricultural products open access journal agricultural products processing STORAGE technology engineering
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Call for Papers from Agricultural Products Processing and Storage
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《肉类研究》 北大核心 2025年第11期I0017-I0017,共1页
Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim ... Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim to offer a platform for the rapid dissemination of signifi cant,novel,and high-impact research in the fi elds of agricultural product processing science,technology,engineering,and nutrition.Additionally,supplemental issues are curated and published to facilitate in-depth discussions on special topics. 展开更多
关键词 NUTRITION SCIENCE agricultural products open access journal agricultural products processing STORAGE technology engineering
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Call for Papers from Agricultural Products Processing and Storage
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《肉类研究》 北大核心 2025年第10期I0017-I0017,共1页
Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim ... Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim to offer a platform for the rapid dissemination of signifi cant,novel,and high-impact research in the fi elds of agricultural product processing science,technology,engineering,and nutrition.Additionally,supplemental issues are curated and published to facilitate in-depth discussions on special topics. 展开更多
关键词 NUTRITION SCIENCE agricultural products open access journal agricultural products processing STORAGE technology engineering
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Call for Papers from Agricultural Products Processing and Storage
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《食品科学》 北大核心 2025年第20期I0022-I0022,共1页
Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim ... Agricultural Products Processing and Storage(ISSN 3059-4510,Owner:Hunan Academy of Agricultural Sciences,China.Production and hosting:Springer Nature)is an international,peer-reviewed open access journal with the aim to offer a platform for the rapid dissemination of signifi cant,novel,and high-impact research in the fi elds of agricultural product processing science,technology,engineering,and nutrition.Additionally,supplemental issues are curated and published to facilitate in-depth discussions on special topics. 展开更多
关键词 NUTRITION SCIENCE agricultural products open access journal agricultural products processing STORAGE technology engineering
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国际全科学术对话——ILD是肺癌独立高危因素!
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《中国全科医学》 北大核心 2025年第25期M0003-M0003,共1页
国际顶级期刊JAMA Network Open最新发表一项覆盖542万瑞典人群、随访30年的大型队列研究(https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2836167),通过兄弟姐妹对照设计有效控制遗传与早期环境混杂因素,确证了间质性... 国际顶级期刊JAMA Network Open最新发表一项覆盖542万瑞典人群、随访30年的大型队列研究(https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2836167),通过兄弟姐妹对照设计有效控制遗传与早期环境混杂因素,确证了间质性肺疾病(ILD)是肺癌的独立危险因素:(1)风险倍增:ILD患者肺癌发病率(355.4/10万人年)显著高于普通人群(26.2/10万人年)。调整性别、年龄、教育、吸烟相关疾病等因素后,ILD患者患肺癌的总体风险增加2.16倍(HR=2.16,95%CI=1.89~2.46)。 展开更多
关键词 肺癌 ILD JAMA Network Open 独立危险因素 大型队列研究
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Future China-Africa research collaboration in geoscience:Challenges and opportunities
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作者 Michael H.STEPHENSON Hassina MOURI +5 位作者 Gbenga OKUNLOLA CHENG Li WANG Meng ZHAO Yu GU Liping WANG Chengshan 《地学前缘》 北大核心 2025年第1期459-465,共7页
At the 19th G20 Summit in Brazil in November 2024,China promoted the development of sustainable solutions to climate change,biodiversity loss,and environmental pollution.This continued the theme of the 2016 G20 Hangzh... At the 19th G20 Summit in Brazil in November 2024,China promoted the development of sustainable solutions to climate change,biodiversity loss,and environmental pollution.This continued the theme of the 2016 G20 Hangzhou Summit,at which China placed development at the center of the G20’s macroeconomic policy coordination for the first time,adopting the G20 Action Plan on the United Nations 2030 Agenda for Sustainable Development and the G20 Initiative on Supporting Industrialization in Africa and Least Developed Countries.In Brazil,China announced actions on advancing modernization in Africa over the next three years with a Chinese commitment of RMB360 billion yuan in financial support.In this article,we examine the potential role of geoscience research and practice in development,particularly in the sustainable use of natural resources,the prevention of climate change impacts,as well as mitigation of geo-hazards and their health implications,indicating the areas where China’s geoscience for Africa is strong and where it requires more effort.We find that although China is the world’s leading publisher of scientific papers,its contribution to geoscience in Africa(the globe’s fastest-growing economic area),as shown by bibliometric research,appears to be rather small and inconsistent with the research priorities of Africa.Amongst the priorities for geoscience research in Africa,which are not addressed substantially by the research conducted so far,are sustainable mineral and hydrocarbon development,hydrology and hydrogeology,climate change and resilience,natural hazards,medical geology,agrominerals,and geoscience education and training.A particular opportunity for African nations is the presence of critical minerals-minerals needed for the energy transition and for batteries for electric cars in particular.Africa is well-endowed with many of these critical materials,such as rare earth elements and platinum group metals.Several research groups stress the need for the agency on the part of African institutions to map out these valuable resources,understand their value and the economics and sustainability of their extraction,encourage local business,attract investment,and scrutinize proposals from potential international investors to get the best deals.A strong point of existing China-led geoscience development includes the Deep-time Digital Earth(DDE)program online computing platform and its artificial intelligence tool GeoGPT,which is being developed in partnership with Zhejiang Laboratory.These are being developed with strong China funding support for free and wide global access,with a particular focus on Africa.These advanced tools will help to place the agency of development squarely in the hands of African scientists and institutions.In summary,the following are recommended:(1)a more coordinated and strategic approach to China-led geoscience research in Africa;(2)an Africa-centered,geoscience funding initiative that concentrates on relevant topics to the continent such as critical minerals exploration and other geological resources,materials and processes and their health implications on the populations and ecosystems in general,as well as climate change and climate change resilience;and(3)continued support for China-led international initiatives that seek to increase the agency and capacity of Africa geoscience researchers,for example the Deep-time Digital Earth platform. 展开更多
关键词 open science sustainable development digital empowerment China-Africa geo-collaboration Deep-Time Digital Earth
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国际全科学术对话——全科医生“安慰剂处方”现象的国际调查:频率不高但影响深远
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《中国全科医学》 北大核心 2025年第34期M0003-M0003,共1页
在JAMA Network Open 2025年9月发表的原创研究《21个国家全科医生开具本质安慰剂治疗处方的调查》(https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2839063)中,研究者对一个长期存在但缺乏准确数据的医疗现象进行了深... 在JAMA Network Open 2025年9月发表的原创研究《21个国家全科医生开具本质安慰剂治疗处方的调查》(https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2839063)中,研究者对一个长期存在但缺乏准确数据的医疗现象进行了深入调查。这项涉及21个国家952名全科医生的大规模调查研究发现,84%的受访医生承认至少曾经开具过一次本质安慰剂处方,即医生明知该治疗不会通过生理机制改善患者症状的处方。 展开更多
关键词 国际调查 JAMA Network Open 全科医生 安慰剂处方
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注塑模具浇注系统的快速设计系统开发
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作者 郝俊珂 安东海 马丙闯 《工程塑料应用》 北大核心 2025年第2期118-125,共8页
浇注系统是注塑模具中必不可少的一部分,设计过程需要考虑多方面的因素,如塑件壁厚、材质等。传统设计方法耗时、易出错,且优化修改过程复杂。借助于Visual studio和UG NX软件,结合浇注系统设计流程,研发了浇注系统的快速设计系统。该... 浇注系统是注塑模具中必不可少的一部分,设计过程需要考虑多方面的因素,如塑件壁厚、材质等。传统设计方法耗时、易出错,且优化修改过程复杂。借助于Visual studio和UG NX软件,结合浇注系统设计流程,研发了浇注系统的快速设计系统。该系统通过采用参数计算集成模块、规则推理技术、特征判断、两点建模法关键技术来实现。参数计算集成模块将浇注系统所用到的计算公式进行集成,大大节约了前期的计算时间;规则推理技术将设计师的经验融入设计过程之中,在一定程度上实现了智能化设计;特征判断浇注系统的几何特征,能够快速选择代码设计的操作函数类型。两点建模法只需指定两点的位置即可确定出主流道、分流道、浇口的建模轴向和长度,能够适用大部分类型和规格的注塑模具结构。这些关键技术通过设计对话框、菜单条、工具条,编程代码驱动动态链接库运行,完成建模。最后,以具体的实例展示了浇注系统的设计过程。结果表明,设计的注塑模具浇注系统提升了设计研发人员的建模速度,节约了前期的模具研发时间。 展开更多
关键词 注塑模具 模具设计 浇注系统 UG/OPEN二次开发 快速设计
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Call for Papers from Journal of Future Foods
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《肉类研究》 北大核心 2025年第11期I0011-I0011,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《肉类研究》 北大核心 2025年第7期I0012-I0012,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《食品科学》 北大核心 2025年第12期I0021-I0021,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《肉类研究》 北大核心 2025年第8期I0017-I0017,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《肉类研究》 北大核心 2025年第9期I0011-I0011,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《食品科学》 北大核心 2025年第9期I0030-I0030,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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Call for Papers from Journal of Future Foods
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《食品科学》 北大核心 2025年第11期I0015-I0015,共1页
Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belongi... Journal of Future Foods(ISSN 2772-5669.Owner:Beijing Academy of Food Sciences.Production and Hosting:Elsevier B.V.on behalf of KeAi Communications Co.,Ltd.)is an international,peer-reviewed open access journal belonging to the discipline of food science and technology.The aim of the journal is to report latest research results of high-tech in food science.We welcome submissions that drive the field of food science towards whole food nutrition,intelligence and high technology. 展开更多
关键词 whole food nutritionintelligence high technology high tech open access journal whole food nutrition food science technology INTELLIGENCE
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开源GIS在乡村景观营建中的应用与展望
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作者 张文超 《现代园艺》 2025年第15期127-129,共3页
新时代,乡村振兴进程不断推进,但发展质量参差不齐,对这一现象进行有效量化分析十分重要。在总结国内外GIS相关研究的基础上,以乡村景观营建的实际项目为依托,对开源软件在乡村振兴及乡村景观项目中的融合应用进行了探讨和展望,以期能... 新时代,乡村振兴进程不断推进,但发展质量参差不齐,对这一现象进行有效量化分析十分重要。在总结国内外GIS相关研究的基础上,以乡村景观营建的实际项目为依托,对开源软件在乡村振兴及乡村景观项目中的融合应用进行了探讨和展望,以期能够降低地理信息使用的门槛,促进地理信息资源的深层次应用,以信息化助力乡村振兴战略。 展开更多
关键词 乡村景观 营建 开源GIS 地理信息系统 QGIS Open Drone Map
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A novel asymptotic linear method for micro-pressure wave mitigation at high-speed maglev tunnel exit:A case study with various open ratios on tunnel hoods
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作者 ZHANG Jie ZHANG Mo-lin +2 位作者 HAN Shuai LIU Tang-hong GAO Guang-jun 《Journal of Central South University》 2025年第5期1955-1972,共18页
A high-speed train travelling from the open air into a narrow tunnel will cause the“sonic boom”at tunnel exit.When the maglev train’s speed reaches 600 km/h,the train-tunnel aerodynamic effect is intensified,so a n... A high-speed train travelling from the open air into a narrow tunnel will cause the“sonic boom”at tunnel exit.When the maglev train’s speed reaches 600 km/h,the train-tunnel aerodynamic effect is intensified,so a new mitigation method is urgently expected to be explored.This study proposed a novel asymptotic linear method(ALM)for micro pressure wave(MPW)mitigation to achieve a constant gradient of initial c ompression waves(ICWs),via a study with various open ratios on hoods.The properties of ICWs and MPWs under various open ratios of hoods were analyzed.The results show that as the open ratio increases,the MPW amplitude at the tunnel exit initially decreases before rising.At the open ratio of 2.28%,the slope of the ICW curve is linearly coincident with a supposed straight line in the ALM,which further reduces the MPW amplitude by 26.9%at 20 m and 20.0%at 50 m from the exit,as compared to the unvented hood.Therefore,the proposed method effectively mitigates MPW and quickly determines the upper limit of alleviation for the MPW amplitude at a fixed train-tunnel operation condition.All achievements provide a ne w potential measure for the adaptive design of tunnel hoods. 展开更多
关键词 novel asymptotic linear method high-speed maglev train micro-pressure wave tunnel hood with various open ratios
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网络大模型专题导读
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作者 唐宏 熊先奎 《中兴通讯技术》 北大核心 2024年第2期1-1,共1页
OpenAI公司基于“Scaling Law”哲学,通过堆叠算力,使用模块化易于扩展且擅长捕捉长距离依赖关系的Transformer神经网络,构建了自回归、生成式的千亿以上参数量大模型,在多个人工智能(AI)领域取得了SOTA效果。目前,OpenAI正在通过图像... OpenAI公司基于“Scaling Law”哲学,通过堆叠算力,使用模块化易于扩展且擅长捕捉长距离依赖关系的Transformer神经网络,构建了自回归、生成式的千亿以上参数量大模型,在多个人工智能(AI)领域取得了SOTA效果。目前,OpenAI正在通过图像、视频等一系列多模态学习,力图实现“World Model”“World Simulator”,以建立物理世界映射。它的实战成果给全世界AI从业者提供了一种目前看来行之有效且朝向通用人工智能(AGI)发展的方法论和技术路线。 展开更多
关键词 OPEN 长距离依赖 World 神经网络 易于扩展 自回归 参数量 多模态学习
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