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Coaxial Wet Spinning of Boron Nitride Nanosheet‑Based Composite Fibers with Enhanced Thermal Conductivity and Mechanical Strength

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Nano-Micro Letters 2024年第2期16卷 126-138页

作者： Wenjiang Lu qixuan Deng Minsu Liu Baofu Ding Zhiyuan Xiong Ling Qiu Tsinghua Shenzhen International Graduate School(TSIGS) Tsinghua UniversityShenzhen 518055People’s Republic of China Monash Suzhou Research Institute(MSRI) Monash UniversitySuzhou 215000People’s Republic of China Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Shenzhen Key Laboratory of Energy Materials for Carbon Neutrality Shenzhen 518055People’s Republic of China School of Light Industry and Engineering South China University of TechnologyGuangzhou 510614People’s Republic of China

hexagonal boron nitride nanosheets(BNNSs)exhibit remarkable thermal and dielectric ***,their self-assembly and alignment in macroscopic forms remain challenging due to the chemical inertness of boron nitride,thereby limiting their performance in applications such as thermal *** this study,we present a coaxial wet spinning approach for the fabrication of BNNSs/polymer composite fibers with high nanosheet *** composite fibers were prepared using a superacid-based solvent system and showed a layered structure comprising an aramid core and an aramid/BNNSs ***,the coaxial fibers exhibited significantly higher BNNSs alignment compared to uniaxial aramid/BNNSs fibers,primarily due to the additional compressive forces exerted at the core-sheath interface during the hot drawing *** a BNNSs loading of 60 wt%,the resulting coaxial fibers showed exceptional properties,including an ultrahigh herman orientation parameter of 0.81,thermal conductivity of 17.2 W m^(-1)K^(-1),and tensile strength of 192.5 *** results surpassed those of uniaxial fibers and previously reported BNNSs composite fibers,making them highly suitable for applications such as wearable thermal management *** findings present a promising strategy for fabricating high-performance composite fibers based on BNNSs.

关键词： Boron nitride nanosheets Coaxial fiber Interfacial compression Nanosheet aligning Wearable thermal management

Dealuminated Hβ zeolite for selective conversion of fructose to furfural and formic acid

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Green Energy & Environment 2024年第2期9卷 311-320页

作者： Rui Li qixuan Lin Junli Ren Xiaobao Yang Yingxiong Wang Lingzhao Kong State Key Laboratory of Pulp and Paper Engineering School of Light Industry and EngineeringSouth China University of TechnologyGuangzhou510640China Institute of Coal Chemistry Chinese Academy of Sciences27 South Taoyuan RoadTaiyuan030001China CAS Key Laboratory of Low-Carbon Conversion Science and Engineering Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201210China School of Environmental Science and Technology Suzhou University of Science and Technology Suzhou Jiangsu215009China

The fructose-to-furfural transformation is facing major challenges in the selectivity and high efficiency. herein, we have developed a simple and effective approach for the selective conversion of fructose to furfural using Hβ zeolite modified by organic acids for dealuminization to regulate its textural and acidic properties. It was found that citric acid-dealuminized Hβ zeolite possessed high specific surface areas, wide channels and high Brønsted acid amount, which facilitated the selective conversion of fructose to furfural with a maximum yield of 76.2% at433 K for 1 h in the γ-butyrolactone(GBL)-H_(2)O system, as well as the concomitant formation of 83.0% formic acid. The^(13)C-isotope labelling experiments and the mechanism revealed that the selective cleavage of C1–C2 or C5–C6 bond on fructose was firstly occurred to form pentose or C5 intermediate by weak Brønsted acid, which was then dehydrated to furfural by strong Brønsted acid. Also this dealuminized Hβ catalyst showed the great recycling performance and was active for the conversion of glucose and mannose.

关键词： Fructose Dealuminated-Hb zeolite Selective conversion Furfural

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欧洲“中国风”中的性别美学

甘肃社会科学 2022年第3期 151-159页

作者：王大桥何琪萱兰州大学文学院兰州730000

中国风经由茶叶、绘画与瓷器纹饰,形成了一种以女性审美感受与生活经验为主导的女托邦形象。女托邦形象溢出了欧洲传统美学家的性别凝视,重塑和改写了合法性审美趣味的意义分配,以女性个体生活情感的真实在场,推动着女性审美趣味及其意... 详细信息

中国风经由茶叶、绘画与瓷器纹饰,形成了一种以女性审美感受与生活经验为主导的女托邦形象。女托邦形象溢出了欧洲传统美学家的性别凝视,重塑和改写了合法性审美趣味的意义分配,以女性个体生活情感的真实在场,推动着女性审美趣味及其意义的生产。经由上行下效的流行机制,欧洲不同阶层的女性通过挪用、改造与戏仿等艺术方式,将中国风作为复数的审美符码系统,孕育出多元叠合的特殊审美文化活动。中国风融入欧洲女性审美趣味的建构过程,松动了古典主义美学趣味,在西方与中国、男性与女性的张力关系中,以跨地域、跨文化的形式,参与和推动了西方现代审美文化观念的生成。

关键词：欧洲中国风性别美学女托邦

Review on piezoelectric actuators:materials,classifications,applications,and recent trends

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Frontiers of Mechanical Engineering 2024年第1期19卷 5-33页

作者： Xuyang ZHOU Shuang WU Xiaoxu WANG Zhenshan WANG qixuan ZHU Jinshuai SUN Panfeng HUANG Xuewen WANG Wei HUANG Qianbo LU Institute of Flexible Electronics(IFE) Northwestern Polytechnical UniversityXi’an 710072China School of Automation Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China

Piezoelectric actuators are a class of actuators that precisely transfer input electric energy into displacement,force,or movement outputs efficiently via inverse piezoelectric effect-based electromechanical *** types of piezoelectric actuators have sprung up and gained widespread use in various applications in terms of compelling attributes,such as high precision,flexibility of stoke,immunity to electromagnetic interference,and structural *** paper systematically reviews the piezoelectric materials,operating principles,representative schemes,characteristics,and potential applications of each mainstream type of piezoelectric ***,we intend to provide a more scientific and nuanced perspective to classify piezoelectric actuators into direct and indirect categories with several *** addition,this review outlines the pros and cons and the future development trends for all kinds of piezoelectric actuators by exploring the relations and mechanisms behind *** rich content and detailed comparison can help build an in-depth and holistic understanding of piezoelectric actuators and pave the way for future research and the selection of practical applications.

关键词： piezoelectric actuator piezoelectric effect amplified piezoelectric actuator ultrasonic actuator stepping actuator piezoelectric polymer

Pathology of pain and its implications for therapeutic interventions

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Signal Transduction and Targeted Therapy 2024年第7期9卷 2851-2899页

作者： Bo Cao qixuan Xu Yajiao Shi Ruiyang Zhao Hanghang Li Jie Zheng Fengyu Liu You Wan Bo Wei Department of General Surgery First Medical CenterChinese PLA General HospitalBeijing 100853China Medical School of Chinese PLA Beijing 100853China Neuroscience Research Institute and Department of Neurobiology School of Basic Medical SciencesKey Laboratory for NeuroscienceMinistry of Education/National Health CommissionPeking UniversityBeijing 100191China

Pain is estimated to affect more than 20%of the global population,imposing incalculable health and economic *** pain management is crucial for individuals suffering from ***,the current methods for pain assessment and treatment fall short of clinical *** from advances in neuroscience and biotechnology,the neuronal circuits and molecular mechanisms critically involved in pain modulation have been *** research achievements have incited progress in identifying new diagnostic and therapeutic *** this review,we first introduce fundamental knowledge about pain,setting the stage for the subsequent *** review next delves into the molecular mechanisms underlying pain disorders,including gene mutation,epigenetic modification,posttranslational modification,inflammasome,signaling pathways and *** better present a comprehensive view of pain research,two prominent issues,sexual dimorphism and pain comorbidities,are discussed in detail based on current *** status quo of pain evaluation and manipulation is summarized.A series of improved and innovative pain management strategies,such as gene therapy,monoclonal antibody,brain-computer interface and microbial intervention,are making strides towards clinical *** highlight existing limitations and future directions for enhancing the quality of preclinical and clinical *** to decipher the complexities of pain pathology will be instrumental in translating scientific discoveries into clinical practice,thereby improving pain management from bench to bedside.

关键词： pain thereby summarized

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冲击式水轮机水斗设计方法及性能优化

清华大学学报（自然科学版） 2024年第5期64卷 852-859页

作者：孙启轩谭磊清华大学能源与动力工程系水圈科学与水利工程全国重点实验室北京100084

雅鲁藏布江下游蕴藏着丰富的水电资源,具有高水头、大容量等特点,冲击式水轮机是优选机型。转轮是冲击式水轮机的核心过流部件和做功部件,水斗形状对转轮性能至关重要。该文将水斗三维几何形状的构造线划分为轮廓线、过流剖面线和引导线... 详细信息

雅鲁藏布江下游蕴藏着丰富的水电资源,具有高水头、大容量等特点,冲击式水轮机是优选机型。转轮是冲击式水轮机的核心过流部件和做功部件,水斗形状对转轮性能至关重要。该文将水斗三维几何形状的构造线划分为轮廓线、过流剖面线和引导线3类,给定若干特征参数,提出了一种可控参数的冲击式水轮机水斗三维设计方法。选择水斗深度、宽度增量、出水边角度、分水刃角度和缺口圆直径等参数对冲击式水轮机水斗开展正交优化。由极差分析可知,宽度增量对转轮效率的影响最大,对出水边角度、缺口圆直径和水斗深度的影响较小,对分水刃角度的影响最小。优化后,冲击式水轮机的水力效率增加了6.71%。相比于原型水斗,优化水斗的总扭矩更大,在扭矩减少至0的过程中平缓过渡,有利于提高机组的水力效率和运行稳定性。

关键词：冲击式水轮机水斗设计方法正交优化数值模拟

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画布上的女性自传:中国视觉现代性中的潘玉良

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现代传记研究

现代传记研究 2023年第1期 219-233页

作者：王大桥何琪萱兰州大学文学院

潘玉良的系列自画像和人物画作为自传作品群,成为展现现代女性主体意识和性别意识的重要方式。女性形象及其审美表达的现代变革彰显了现代视觉经验与古典审美趣味的断裂,表现出中国视觉经验的现代转换:潘玉良自画像以女性主体视角进行... 详细信息

潘玉良的系列自画像和人物画作为自传作品群,成为展现现代女性主体意识和性别意识的重要方式。女性形象及其审美表达的现代变革彰显了现代视觉经验与古典审美趣味的断裂,表现出中国视觉经验的现代转换:潘玉良自画像以女性主体视角进行自我表征,颠覆了中国传统仕女图中的女性形象刻画方式,同时对欧洲传统美学中隐含的男性主体视角发起挑战;画展中的女性身体形象作为中国现代性视觉经验的典型代表,在“看”与“被看”的多重关系中建构了新的观看主体与观看方式;对女性个体情感经受与感性经验的细腻刻画,转换了以往艺术作品中被捕捉和操纵的女性客体,生成了现代女性主体对自我情感经验的主动表达;以中西合璧的审美主张影响欧洲国家的现代性观念,为中欧审美共同体的建立奠定了坚实的情感基础。

关键词：潘玉良自传视觉现代性自画像人物画

“动批”的新生——北京动物园公交枢纽更新实践

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建筑技艺 2023年第4期29卷 88-91页

作者：刘京贺奇轩刘璐北京城建设计发展集团股份有限公司城市院北京城建设计发展集团股份有限公司城市院综合二所北京城建设计发展集团股份有限公司

在北京城市更新背景下,曾经的北京动物园公交枢纽作为北展地区和“动物园批发市场”区域产业转型的示范项目,从尊重街道空间的立面更新、激发创新活力的办公空间、看得见风景的大厦、节能舒适的室内环境、全天候建筑、公共交通一体化等... 详细信息

在北京城市更新背景下,曾经的北京动物园公交枢纽作为北展地区和“动物园批发市场”区域产业转型的示范项目,从尊重街道空间的立面更新、激发创新活力的办公空间、看得见风景的大厦、节能舒适的室内环境、全天候建筑、公共交通一体化等多方面进行升级改造,从而使其成为一座具有活力的城市综合体。

关键词：城市更新交通枢纽新型办公 TOD 屋顶花园

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北海市臭氧污染天气分型及特征分析

气象研究与应用 2023年第3期44卷 72-76页

作者：何启玄廖国莲北海市气象台广西北海536000 广西壮族自治区气象台南宁530022

利用欧洲中期天气预报中心全球气候第五代大气再分析数据(ERA5),采用聚类分析方法,对2019—2021年北海市臭氧污染天气的环流形势进行分类,并通过Mann-Whitney U非参数检验法检验臭氧污染发生与否的环流形势差异显著性。结果表明,北海臭... 详细信息

利用欧洲中期天气预报中心全球气候第五代大气再分析数据(ERA5),采用聚类分析方法,对2019—2021年北海市臭氧污染天气的环流形势进行分类,并通过Mann-Whitney U非参数检验法检验臭氧污染发生与否的环流形势差异显著性。结果表明,北海臭氧污染天气分型主要有:北方低压型、南方低压型、南下冷高压东出型和冷高压南下前型四类,其中南下冷高压东出型和冷高压南下前型占81.82%。基于Mann-Whitney U非参数检验的交集,既是臭氧污染预报指标,也是每种天气分型之间显著性差异的区域。两种低压型主要出现在北半球夏半年,两种高压型则主要出现在北半球冬半年。所有天气分型均具有利于污染物在底层堆积、扩散条件弱的特征。

关键词：分型臭氧天气形势空气污染