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Critical Heat Flux(CHF)Correlations for Subcooled Water Flow Boiling at High Pressure and High Heat Flux

Journal of Thermal Science 2021年第1期30卷 279-293页

作者： LIU Ping guo yusheng DING Wenlong TANG Mingyun SONG Yuntao PENG Xuebing JI Jiadong CHEN Qinghua MAO Xin State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China School of Mechanical Engineering Anhui University of Science and TechnologyHuainan 232001China Anhui Key Laboratory of Mine Intelligent Equipment and Technology Anhui University of Science and TechnologyHuainan 232001China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China School of Mining and Safety Engineering Anhui University of Science and TechnologyHuainan 232001China

The subcooled water flow boiling is beneficial for removing the high heat flux from the divertor in the fusion reactor,for which an accurate critical heat flux(CHF)correlation is necessary.Up to now,there are many CHF correlations mentioned for subcooled water flow boiling in the open literatures.However,the CHF correlations’accuracies for the prediction of subcooled water flow boiling are not satisfactory at high heat flux and high pressure for reactor divertor.The present paper compiled 1356 CHF experimental data points from 15 independent open literatures and evaluated 10 existing CHF correlations in subcooled water flow boiling.From the evaluation,the W-2 CHF correlation performs best for the experimental CHF data in all existing critical heat flux correlations.However,the predicted mean absolute error(MAE)of the W-2 correlation is not very ideal for all database and the MAE of the W-2 correlation is from 30%to 50%for some database.In order to enhance the CHF prediction accuracy in subcooled water flow boiling at high heat flux and high pressure,the present paper developed a new CHF correlation.Compared with other existing CHF correlations,the new CHF correlation greatly enhances the prediction accuracy over a broad range of pressures and heat fluxes which are desired in the cooling of high heat flux devices,such as those in the fusion reactor divertor.The validation results show that the new correlation has a MAE of 10.05%and a root mean squared error(RMSE)of 16.61%,predicting 68.1%of the entire database within±10%and 81.5%within±15%.The MAE of the new CHF correlation is 7.4%less than that of the best existing one(W-2 correlation),further confirming its superior prediction accuracy and reliability.Besides,the new CHF correlation works well not only for a uniform power profile but also for a non-uniform power profile in subcooled water flow boiling at high pressure and high heat flux.

关键词： reactor divertor correlations subcooled water flow boiling critical heat flux(CHF) high heat flux high pressure

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深度神经网络模型水印研究进展

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上海理工大学学报 2024年第3期46卷 225-242页

作者：谭景轩钟楠郭钰生钱振兴张新鹏复旦大学计算机科学技术学院上海200433

随着深度神经网络在诸多领域的成功应用,以神经网络水印为代表的深度模型知识产权保护技术在近年来受到了广泛关注。对现有的深度神经网络模型水印方法进行综述,梳理了目前为了保护模型知识产权而提出的各类水印方案,按照提取水印时所... 详细信息

随着深度神经网络在诸多领域的成功应用,以神经网络水印为代表的深度模型知识产权保护技术在近年来受到了广泛关注。对现有的深度神经网络模型水印方法进行综述,梳理了目前为了保护模型知识产权而提出的各类水印方案,按照提取水印时所具备的不同条件,将其分为白盒水印、黑盒水印和无盒水印3类方法,并对各类方法按照水印嵌入机制或适用模型对象的不同进行细分,深入分析了各类方法的主要原理、实现手段和发展趋势。然后,对模型水印的攻击方法进行了系统总结和归类,揭示了神经网络水印面对的主要威胁和安全问题。在此基础上,对各类模型水印中的经典方法进行了性能比较和分析,明确了各个方法的优势和不足,帮助研究者根据实际的应用场景选用合适的水印方法,为后续研究提供基础。最后,讨论了当前深度神经网络模型水印面临的挑战,并展望未来可能的研究方向,旨在为相关的研究提供参考。

关键词：深度神经网络知识产权保护神经网络水印白盒水印黑盒水印无盒水印水印攻击模型安全

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紧邻热力管线小空间静态爆破安全防护技术

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施工技术（中英文） 2024年第8期53卷 77-80页

作者：曹国伟郭淯晟谢龙安姚俊张波秦晓龙中国建筑第二工程局有限公司华南分公司广东珠海519000

广东省珠海市高栏石化片区排涝整治工程项目在修建山体截洪沟过程中,需采用静态爆破。爆破施工时易发生小范围滑坡或飞石、落石等现象,在小空间内对坡脚热力、天然气等管线有较大威胁。因此,采用钢结构框架对现状热力管线进行保护并在... 详细信息

广东省珠海市高栏石化片区排涝整治工程项目在修建山体截洪沟过程中,需采用静态爆破。爆破施工时易发生小范围滑坡或飞石、落石等现象,在小空间内对坡脚热力、天然气等管线有较大威胁。因此,采用钢结构框架对现状热力管线进行保护并在迎面侧及上方增加砂袋缓冲区。详细介绍钢结构框架防护方案设计及施工工艺要求,并对边坡顶及电塔基座顶位移进行监测。实践表明,钢结构框架防护技术最大程度地保证了管线安全,坡顶及电塔基座顶位移得到了有效控制。

关键词：边坡静态爆破管线钢结构监测位移施工技术

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基于AMMI模型的花生新品种区域试验分析

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东北农业科学 2024年第1期49卷 54-58页

作者：李飞韩昕君周彦忠姬小玲李斯佳郭玉生漯河市农业科学院河南漯河462000

为进一步了解国家北方片花生新品种多点试验中小粒花生新品种的高产、稳产潜力以及各试点鉴别力,本研究以2019年国家北方片花生多点试验中小粒二组花生品种的荚果产量为依据,运用AMMI模型对11个花生品种在18个试点的荚果产量进行分析,... 详细信息

为进一步了解国家北方片花生新品种多点试验中小粒花生新品种的高产、稳产潜力以及各试点鉴别力,本研究以2019年国家北方片花生多点试验中小粒二组花生品种的荚果产量为依据,运用AMMI模型对11个花生品种在18个试点的荚果产量进行分析,结果表明,品种间、试点间、品种与试点间互作、交互效应主成分值(IPCA)均达到了显著差异,且IPCA1、IPCA2、IPCA3共占互作效应的71.36%。在参加试验的11个品种中,丰产性前3位的品种依次为:冀农花16号、开农111、漯花22号;稳产性前3位的品种依次为:花育20号、漯花22号、商花588;高产稳产前3位的品种依次为:冀农花16号、漯花22号、商花588。18个试点中鉴别力前3位的试点依次为:山东菏泽、河南漯河、河南驻马店;鉴别力较差的试点为:辽宁锦州、河北保定、河南濮阳。

关键词：花生 AMMI模型区域试验稳定性

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隐伏振动源的地震定位技术

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工程地球物理学报 2024年第4期21卷 722-733页

作者：冯凡苏荣华刘劲松张春贺郭玉胜范建国王赟中国地质大学“多波多分量”地震研究组北京100083 军事科学院国防工程研究院北京100850 中国地质调查局油气资源调查中心北京100083 北京自动化控制设备研究所北京100074 山东能源集团有限公司山东济南250014

隐伏目标探测是军事防护的重点之一,但是难以借助常规的光学或图像技术实现。针对这一问题,本文首先回溯和总结地震定位技术的发展和应用,展示了地震方法在隐伏振动目标探测和定位上具有显著的优势;然后利用中国柴达木盆地西部采集的微... 详细信息

隐伏目标探测是军事防护的重点之一,但是难以借助常规的光学或图像技术实现。针对这一问题,本文首先回溯和总结地震定位技术的发展和应用,展示了地震方法在隐伏振动目标探测和定位上具有显著的优势;然后利用中国柴达木盆地西部采集的微地震资料,采用非线性定位法和双差法对微地震事件进行了定位。最终结果表明:1)与非线性定位方法相比,重定位的微震震源分布得更集中,震群之间的边界更清晰,与已知的断裂构造相符;2)重定位的误差降低了一个量级,绝大多数地震事件经过非线性定位后的水平和深度误差在1000 m以内,而双差法的误差则控制在100 m以内。该实例证实了利用地震定位技术探测隐伏振动目标的可行性。

关键词：隐伏目标地震定位双差法微震柴达木盆地

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Innovations in metallurgical and materials processes:advancing liquid theory and honoring Prof.Han-jie guo's contributions to physical chemistry in metallurgy

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Journal of Iron and Steel Research(International) 2024年第1期31卷 1-2页

作者： Shuai Liu Jing guo Han-jie guo School of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,Prof.Han-jie guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of metallurgy.Operating under the a... 详细信息

关键词： chemistry liquid complexes

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Effect of Slash Burning on Nutrient Removal and Soil Fertility in Chinese Fir and Evergreen Broadleaved Forests of Mid-Subtropical China

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Pedosphere 2003年第1期13卷 87-96页

作者： YANG yusheng, guo JIANFEN, CHEN GUANGSHUI, HE ZONGMING and XIE JINSHENGFujian Agriculture and Forestry University, Nanping 353001 (China) Fujian Agricultureand Forestry University Nanping 353001

A Chinese fir forest (Cunninghamia lanceolata, CF) and an evergreen broadleaved forest (EB) located inFujian Province, southeastern China, were examined following slash burning to compare nutrient capital andtopsoil properties with pre-burn levels. After fire, nutrient (N, P and K) removal from burning residues wasestimated at 302.5 kg ha-1 in the CF and 644.8 kg ha-1 in the EB. Fire reduced the topsoil capitals of totalN and P by about 20% and 10%, respectively, in both forests, while K capital was increased in the topsoils ofboth forests following fire. Total site nutrient loss through surface erosion was 28.4 kg (N) ha-1, 8.4 kg (P)ha-1 and 328.7 kg (K) ha-1 in the CF. In the EB, the losses of total N, P and K were 58.5, 10.5 and 396.3kg ha-1, respectively. Improvement of soil structure and increase in mineralization of nutrients associatedwith increased microbe number and enzyme activities and elevated soil respiration occurred 5 days after fire.However, organic matter and available nutrient contents and most of other soil parameters declined one yearafter fire on the burned CF and EB topsoils. These results suggest that short-term site productivity canbe stimulated immediately, but reduced subsequently by soil and water losses, especially in South China,where high-intensity precipitation, steep slopes and fragile soil can be expected. Therefore, the silviculturalmeasurements should be developed in plantation management.

关键词：杉木土壤肥力常绿阔叶林营养物质亚热带地区中国

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Light People:Prof.Eric Mazur speaks about ultrafast optics and education

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Light(Science & Applications) 2024年第3期13卷 402-406页

作者： Chenzi guo Yang Li Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina State Key Laboratory of Precision Measurement Technology and Instrument Department of Precision InstrumentTsinghua UniversityBeijingChina

Prof.Eric Mazur is a great influencer over and beyond the optics community.As a physicist,he is a pioneer of ultrafast optics and was one of the inventors of colliding-pulse mode-locked laser.As an educator,he not only gave talks to thousands,but also revolutionized teaching with his globally renowned methodology“Peer Instruction”.As a leader and entrepreneur,he co-founded several companies and was President of Optica(formerly the Optical Society)and currently is the Chair of the Optica Foundation.Here,Light:Science&Applications talked with Prof.Eric Mazur about his opinions on research,education and industry.The full interview video can be found in the Supplementary File.

关键词： optics education companies

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Emerging direct current triboelectric nanogenerator for high-entropy mechanical energy harvesting

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Science China(Technological Sciences) 2024年第5期67卷 1297-1316页

作者： CHEN Jie guo RuiLong guo HengYu College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Department of Applied Physics Chongqing UniversityChongqing 401331China

In the era of the Internet of Things(IoT),the provision of sustainable power to distributed,mobile,and low-power-consumption electronic devices is a critical challenge.To overcome this challenge,the triboelectric nanogenerator(TENG),a highly efficient high-entropy mechanical energy harvesting device,was developed in 2012.This device enables the direct conversion of irregular and low-frequency mechanical energy into pulsed alternating current(AC)signals.However,the incompatibility of most electronic devices with AC signals necessitates rectifier circuits or generators that deliver direct current(DC)signals.In recent years,DC-TENGs have undergone extensive development,achieving significant milestones in various application fields while also facing crucial challenges that require solutions.In this review,three categories of DC-TENG devices with distinct operating mechanisms are comprehensively explored:multiphase coupling,mechanical rectification,and air breakdown.Their typical structures and working mechanisms are thoroughly discussed,and specific output performance limitations,along with corresponding optimization strategies,are identified.Furthermore,the applications of DC-TENGs in various scenarios are summarized.Finally,the challenges faced by DC-TENGs and potential solutions are analyzed to guide further advancements in this technology.

关键词： TENG direct current working mechanisms output performance limitations optimization strategies

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Light People:Prof.Kei May Lau,newly elected US NAE member in Hong Kong,talks about future of photonics and women in science

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Light(Science & Applications) 2024年第4期13卷 602-608页

作者： Yating Wan Chenzi guo Electrical and Computer Engineering the ComputerElectrical and Mathematical Sciences and Engineering DivisionKing Abdullah University of Science and Technology23955-6900 ThuwalSaudi Arabia Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina

Editorial Photonics technology remains a driving force in today’s scientific landscape,marked by continuous innovation and crossdisciplinary relevance.In an enlighting conversation with Light:Science&Applications,Prof.Kei May Lau,a pioneer in photonics research,shares her deep insights on the evolution of technologies of LEDs,lasers,challenges of hetero-epitaxy,and the future of micro-LEDs and quantum dot lasers.Recently honored as a member of the US National Academy of Engineering(NAE)for her significant contributions to photonics and electronics using III-V semiconductors on silicon,Prof.Lau stands out as the sole Hong Kong scholar inducted into the NAE this year,joining 114 new and 21 international members.In this exclusive Light People interview,Prof.Lau shares her journey as a pioneering woman in engineering,her commitment to mentorship and academia,and her perspective on advancing female representation in science.The summary provided is distilled from Prof.Lau’s thoughtful responses during the interview.For a deeper exploration of Prof.Lau’s experiences and advice,the full interview is available in the Supplementary material.

关键词： interview lighting driving

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