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Recent advances in graphene-based phase change composites for thermal energy storage and management

Nano Materials Science 2024年第2期6卷 115-138页

作者： qiang Zhu Pin Jin ong Si Hui Angela Goh Reuben J.Yeo Suxi Wang Zhiyuan Liu xian Jun Loh Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis WayInnovis#08-03138634Singapore Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)1 Pesek RoadJurong Island627833Singapore School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang Link637371Singapore Shenzhen Institutes of Advanced Technology(SIAT) Chinese Academy of Sciences(CAS)1068 Xueyuan AvenueShenzhen518055China Department of Material Science and Engineering National University of Singapore9 Engineering Drive 1#03-09 EA117575Singapore

Energy storage and conservation are receiving increased attention due to rising global energy ***,the development of energy storage materials is *** energy storage(TES)systems based on phase change materials(PCMs)have increased in prominence over the past two decades,not only because of their outstanding heat storage capacities but also their superior thermal energy regulation ***,issues such as leakage and low thermal conductivity limit their applicability in a variety of ***-based materials such as graphene and its derivatives can be utilized to surmount these *** study examines the recent advancements in graphene-based phase change composites(PCCs),where graphene-based nanostructures such as graphene,graphene oxide(GO),functionalized graphene/GO,and graphene aerogel(GA)are incorporated into PCMs to substantially enhance their shape stability and thermal conductivity that could be translated to better storage capacity,durability,and temperature response,thus boosting their attractiveness for TES *** addition,the applications of these graphene-based PCCs in various TES disciplines,such as energy conservation in buildings,solar utilization,and battery thermal management,are discussed and summarized.

关键词： Phase change material Nanocomposites Solar energy Sustainable energy Thermo-regulation

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PGPR调控植物响应逆境胁迫的作用机制

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草业学报 2024年第6期33卷 203-218页

作者：伍国强于祖隆魏明兰州理工大学生命科学与工程学院甘肃兰州730050

盐碱、干旱等非生物胁迫是限制植物生长和产量的重要环境因子。植物根际促生菌(PGPR)是一类定殖于植物根系的有益微生物,利用其生物学功能制成的生物菌剂具有低成本、高效和环保等优点,不仅可促进植物生长与作物产量,还能提高植物对非... 详细信息

盐碱、干旱等非生物胁迫是限制植物生长和产量的重要环境因子。植物根际促生菌(PGPR)是一类定殖于植物根系的有益微生物,利用其生物学功能制成的生物菌剂具有低成本、高效和环保等优点,不仅可促进植物生长与作物产量,还能提高植物对非生物胁迫的耐受性。本研究对PGPR定义和种类、生物学功能及其在植物响应盐碱、干旱、高低温及重金属等非生物胁迫中的作用加以综述,并对其未来研究方向进行展望,以期为今后PGPR介导植物抗逆性的研究与生物菌剂的开发和应用提供理论支撑。

关键词：植物根际促生菌固氮菌溶磷菌植物激素非生物胁迫抗逆性

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复合夹芯导流罩流激噪声数值模拟与控制研究

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舰船科学技术 2024年第8期46卷 75-80页

作者：徐强夏茂龙李永正江苏科技大学船舶与海洋工程学院江苏镇江212000

航行过程中,潜艇壁面与周围流场相互作用而产生的流激噪声会对透声窗结构产生严重危害,因此,有效控制流激噪声具有非常重要的意义。首先采用统计能量法对潜艇首部模型进行流激噪声预报,根据不同航速以及距湍流层前端距离进行分析,得出... 详细信息

航行过程中,潜艇壁面与周围流场相互作用而产生的流激噪声会对透声窗结构产生严重危害,因此,有效控制流激噪声具有非常重要的意义。首先采用统计能量法对潜艇首部模型进行流激噪声预报,根据不同航速以及距湍流层前端距离进行分析,得出不同材料对流激噪声的影响规律;其次,针对导流罩低噪声和高透声的要求提出一种3层复合夹芯结构设计,通过选用阻尼材料和设计4种铺层方案对比分析。结果表明,铺层方案为碳纤维/阻尼材料2/钛合金,铺层厚度为10 mm/10 mm/3.55 mm是降噪性能好、透声性强的最优方案,研究成果可为实际应用提供参考。

关键词：统计能量法流激噪声导流罩复合夹芯结构

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回火热处理在复合消音锯片加工过程中的影响和作用

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热处理技术与装备 2024年第1期45卷 20-23页

作者：夏昌龙韩涛张露方发强黑旋风锯业股份有限公司湖北宜昌443003

针对复合消音锯片生产过程中的点焊热变形问题,通过优化回火工艺参数,采用中温上限回火和缩短保温时间的二次梯度回火工艺,使点焊后的热应力得到最大程度消除,从而改善二次回火后消音锯片的平面度和端跳值等指标。为后续磨削和校平的处... 详细信息

针对复合消音锯片生产过程中的点焊热变形问题,通过优化回火工艺参数,采用中温上限回火和缩短保温时间的二次梯度回火工艺,使点焊后的热应力得到最大程度消除,从而改善二次回火后消音锯片的平面度和端跳值等指标。为后续磨削和校平的处理减轻加工难度,同时稳定地控制和保证复合消音锯片的实物质量水平。

关键词：金刚石复合消音锯片点焊热应力变形回火平面度

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基于景观格局的玉溪市“三湖”流域生态风险演化分析

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水生态学杂志 2024年第2期45卷 54-62页

作者：孙咏琦李约翰李强军陈永志刘士鑫李言龙李建华云南农业大学水利学院云南昆明650201 云南农业大学自然资源科学技术工程研究中心云南昆明650201 云南省地矿测绘院有限公司云南昆明650218 云南农业大学资源与环境学院云南昆明650201

以玉溪市“三湖”流域为研究对象,对研究区内生态风险状况进行研究,揭示其20年生态风险演化特征。对2000-2020年的土地利用数据进行等间距采样,基于景观格局指数建立生态风险模型并利用空间自相关分析、地统计学分析、重心转移等方法对... 详细信息

以玉溪市“三湖”流域为研究对象,对研究区内生态风险状况进行研究,揭示其20年生态风险演化特征。对2000-2020年的土地利用数据进行等间距采样,基于景观格局指数建立生态风险模型并利用空间自相关分析、地统计学分析、重心转移等方法对研究区内景观格局变化特征以及生态风险演变进行探究。结果表明:(1)社会发展及人类活动导致建筑用地的分离度等在研究期内呈线性减少趋势,而草地的破碎度在20年里呈上升趋势,由2000年的0.55增长到2020年的0.93;(2)生态风险格局在空间上呈现显著正相关,Moran’s I指数由2000年的0.522下降至2022年的0.513,表明研究区内景观生态风险值在空间分布上的依赖性减弱,空间趋同性逐渐降低;(3)研究区内多年间生态风险呈现先上升后下降的趋势且生态风险格局重心整体向西南偏移,高风险区主要分布在研究区北部的林草地带以及湖泊周围,20年面积增加了6 212.07 hm^(2)。研究结果可为流域内水资源开发、生态安全保护等决策提供支持。

关键词：生态风险景观格局指数标准差椭圆空间自相关地统计学玉溪市

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Recent advances in graphene-based phase change composites for thermal energy storage and management

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纳米材料科学 2024年第2期 115页

作者： qiang Zhu Pin Jin ong Si Hui Angela Goh Reuben J.Yeo Suxi Wang Zhiyuan Liu xian Jun Loh

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Federated Learning with Privacy-preserving and Model IP-right-protection

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Machine Intelligence Research 2023年第1期20卷 19-37页

作者： qiang Yang Anbu Huang Lixin Fan Chee Seng Chan Jian Han Lim Kam Woh Ng Ding Sheng ong Bowen Li WeBank Shenzhen 518057China Hong Kong University of Science and Technology Hong Kong 999077China University of Malaya Kuala Lumpur 50603Malaysia University of Surrey Guildford GU27XHUK University of Aberystwyth Wales SY233DDUK Shanghai Jiao Tong University Shanghai 200240China

In the past decades,artificial intelligence(AI)has achieved unprecedented success,where statistical models become the central entity in ***,the centralized training and inference paradigm for building and using these models is facing more and more privacy and legal *** bridge the gap between data privacy and the need for data fusion,an emerging AI paradigm feder-ated learning(FL)has emerged as an approach for solving data silos and data privacy *** on secure distributed AI,feder-ated learning emphasizes data security throughout the lifecycle,which includes the following steps:data preprocessing,training,evalu-ation,and *** keeps data security by using methods,such as secure multi-party computation(MPC),differential privacy,and hardware solutions,to build and use distributed multiple-party machine-learning systems and statistical models over different data *** data privacy concerns,we argue that the concept of“model”matters,when developing and deploying federated models,they are easy to expose to various kinds of risks including plagiarism,illegal copy,and *** address these issues,we introduce FedIPR,a novel ownership verification scheme,by embedding watermarks into FL models to verify the ownership of FL models and protect model intellectual property rights(IPR or IP-right for short).While security is at the core of FL,there are still many articles re-ferred to distributed machine learning with no security guarantee as“federated learning”,which are not satisfied with the FL definition supposed to *** this end,in this paper,we reiterate the concept of federated learning and propose secure federated learning(SFL),where the ultimate goal is to build trustworthy and safe AI with strong privacy-preserving and *** provide a com-prehensive overview of existing works,including threats,attacks,and defenses in each phase of SFL from the lifecycle perspective.

关键词： Federated learning privacy-preserving machine learning security decentralized learning intellectual property protection

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RNA G-quadruplex stabilizers as novel therapeutics for anticancer therapy

RNA G-quadruplex stabilizers as novel therapeutics for antic...

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第六届全国化学生物学学术会议

作者： Wei qiang ong National University of Singapore Department of Chemistry 3 Science Drive 3Singapore 117543

＜正＞Telomere shortening contributes to replicative senescence that limits cellular life *** 80-90%of cancerous cells overcome this limitation by over-expressing telomerase,an enzyme that catalyzes the extension of t...

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Apolipoprotein E gene polymorphisms associated with processing speed and executive functions in healthy Han Chinese

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Neuroscience Bulletin 2015年第3期31卷 368-370页

作者： Cheng-Cheng Zhang H ong-Yan Ren Ming-LiLi qiang Wang Wei Deng Wan-Jun Guo Wei Lei Bo xiang Lian-Sheng Zhao xiao-Hong Ma Yong-Gang Yao Tao Li The Mental Health Center West China Hospital Sichuan University The Psychiatric Laboratory State Key Laboratory of Biotherapy West China Hospital Sichuan University Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences a nd Yunnan Province Kunming Institute of Zoology

Dear Editor,A few studies have focused on exploring APOE gene- related effects on cognitive functions and brain activities in healthy populations. Bondi et aL found that ε4 carriers perform significantly worse on the California Verbal Learning Test than non-carriers in non-demented old subjects （mean age, 72 years）ε11. But the results are not entirely consistent. For example, Scarmeas et aL found no effect of the E4 allele on neuropsychological performance[2] in young adults, and Jochemsen et al. found that the ε4 allele is associated with age-related cognitive decline[3]. Furthermore, protective and negative effects of the E2 allele on cognition are inconsistent[4＇ s]. APOE E2 is thought to be a protective allele for AD in the elderly population due to its role in the superior cognitive performance of ε2 carriers compared to E3 or E4 carriers[5]. However, the ε2 allele has also been found to have a negative effect on AD pathology[4].

关键词： Apolipoprotein E gene polymorphisms associated with processing speed and executive functions in healthy Han Chinese gene

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Wax from Pyrolysis of Waste Plastics as a Potential Source of Phase Change Material for Thermal Energy Storage

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Transactions of Tianjin University 2023年第3期29卷 225-234页

作者： Pin Jin ong Zhi x.ong Jerry Heng Zhenxiang xing Hnin Yu Yu Ko Pei Wang Hongfei Liu Rong Ji xizu Wang Beng Hoon Tan Zibiao Li Jian Wei xu xian Jun Loh Enyi Ye qiang Zhu Institute of Materials Research and Engineering A*STAR(Agency for ScienceTechnology and Research)2 Fusionopolis WayInnovis#08-03Singapore 138634Singapore Institute of Sustainability for Chemicals Energy and EnvironmentA*STAR(Agency for ScienceTechnology and Research)1 Pesek RoadJurong IslandSingapore 627833Singapore Department of Chemistry National University of Singapore3 Science Drive 3Singapore 117543Singapore Department of Material Science and Engineering National University of Singapore9 Engineering Drive 1#03-09 EASingapore 117575Singapore School of Chemistry Chemical Engineering and BiotechnologyNanyang Technological University21 Nanyang LinkSingapore 637371Singapore

Over the past half-century, plastic consumption has grown rapidly due to its versatility, low cost, and unrivaled functional properties. Among the diff erent implemented strategies for recycling waste plastics, pyrolysis is deemed the most economical option. Currently, the wax obtained from the pyrolysis of waste plastics is mainly used as a feedstock to manufacture chemicals and fuels or added to asphalt for pavement construction, with no other applications of wax being reported. Herein, the thermal pyrolysis of three common waste polyolefin plastics: high-density polyethylene(HDPE), low-density polyethylene(LDPE), and polypropylene(PP), was conducted at 450 ℃. The waste plastics-derived waxes were characterized and studied for a potential new application: phase change materials(PCMs) for thermal energy storage(TES). Gas chromatography–mass spectrometry analysis showed that paraffin makes up most of the composition of HDPE and LDPE waxes, whereas PP wax contains a mixture of naphthene, isoparaffin, olefin, and paraffin. Diff erential scanning calorimetry(DSC) analysis indicated that HDPE and LDPE waxes have a peak melting temperature of 33.8 ℃ and 40.3 ℃, with a relatively high latent heat of 103.2 J/g and 88.3 J/g, respectively, whereas the PP wax was found to have almost negligible latent heat. Fourier transform infrared spectroscopy and DSC results revealed good chemical and thermal stability of HDPE and LDPE waxes after 100 cycles of thermal cycling. Performance evaluation of the waxes was also conducted using a thermal storage pad to understand their thermoregulation characteristics for TES applications.

关键词： Pyrolysis Waste plastics Recycling Wax Phase change materials

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