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Journal of Bionic Engineering 2019年第4期16卷 608-620页

作者： jie Chen Zhongchao Liang Yanhe zhu jie Zhao School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

This paper explores the design of leg morphology in a six-legged *** by nature,where animals have different leg morphology,we examined how the difference in leg morphology influences behaviors of the *** this end,a systematic search was conducted by scanning over the parameter space consisting of default angles of leg joints of the six-legged robot,with two main objectives:to maximize the kinematic flexibility and walking performance of the *** show that(1)to have a high kinematic flexibility with both the torso and swing legs,the femur segment should tilt downwards by 5°-10°and the tibia segment should be vertically downwards or with a slight inward tilt;(2)to achieve relatively energy-efficient and steady walking,the tibia segment should be approximately vertically downwards,with the femur segment tilting upwards to lower the torso *** results of this study suggest that behaviors of legged robots can be passively enhanced by careful mechanical design choices,thereby leading to more competent legged machines.

关键词： six-legged robot leg morphology kinematic flexibility walking performance

Performance Analysis and Improvement of Flat Torque Converters Using DOE Method

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 101-109页

作者： Guang-Qiang Wu jie Chen Wen-jie zhu School of Automotive Studies Tongji University Institute of Industrial Science The University of Tokyo

Automotive torque converters have recently been designed with an increasingly narrower profile for the purpose of achieving a smaller axial size and reducing weight. Design of experiment(DOE) and computational fluid dynamics(CFD) techniques are applied to improve the performance of a flat torque converter. Four torque converters with different flatness ratios(0.204, 0.186, 0.172, and 0.158) are designed and simulated first to investigate the effects of flatness ratio on their overall performance, including efficiency, torque ratio, and impeller torque factor. The simulation results show that the overall performance tends to deteriorate as the flatness ratio decreases. Then a parametric study covering six geometric parameters, namely, inlet and outlet angles of impeller, turbine, and stator is carried out. The results demonstrate that the inlet and outlet angles play an important role in determining the performance characteristics of a torque converter. Furthermore, the relative importance of the six design parameters is investigated using DOE method for each response(stall torque ratio and peak efficiency). The turbine outlet angle is found to exert the greatest influence on both responses. After DOE analysis, an optimized design for the flat torque converter geometry is obtained. Compared to the conventional product, the width of the optimized flat torque converter torus is reduced by about 20% while the values of stall torque ratio and peak efficiency are only decreased by 0.4% and 1.7%, *** proposed new optimization strategy based on DOE method together with desirability function approach can be used for performance enhancement in the design process of flat torque converters.

关键词： Torque converter Flatness ratio Computational fluid dynamics(CFD) Parametric study Design of experiment(DOE)

A Molecular Hepatocellular Carcinoma Prognostic Score System Precisely Predicts Overall Survival of Hepatocellular Carcinoma Patients

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Journal of Clinical and Translational Hepatology 2022年第2期10卷 273-283页

作者： jie jia Jing Tang Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWu-hanHubeiChina Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubeiChina

Background and Aims:With high rates of recurrence post-treatment,hepatocellular carcinoma(HCC)is one of the most common types of cancer worldwide and the major cause of cancer *** improve the overall survival of HCC patients,identification of a reliable biomarker and precise early diagnosis of HCC remain major unsolved ***:We initially screened data from the Cancer Genome Atlas liver cancer cohort to identify potential prognosis-related ***,a metaanalysis of five international HCC cohorts was implemented to validate such ***,artificial intelligence models(random forest and neural network)were trained to predict prognosis accurately,and a log-rank test was performed for ***,the correlation between the molecular hepatocellular carcinoma prognostic score(mHPS)and the stromal and immune scoring in HCC were ***:A comprehensive list of 65 prognosis-related genes was obtained,most of which have been not extensively studied thus far.A universal HCC mHPS system depending on the expression pattern of only 23 genes was *** mHPS system had general applicability to HCC patients(log-rank p<0.05)in a platform-independent manner(RNA sequencing or microarray).The mHPS was also correlated with the stromal and immune scoring in HCC,reflecting the status of the tumor immune ***:Overall,the mHPS is an easy and cost-effective prognosis predicting system,which can disclose previously uncovered heterogeneity among patient *** mHPS system can further stratify patients who are at the same clinical stage and should be valuable for precise ***,the prognosis-related genes recog-nized in this study have potential in targeted and immune therapy.

关键词： Hepatocellular carcinoma Random forest Neural network Prog-nostic scoring system Personalized medicine

Designing hierarchical structures for innovative cooling textile

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Nano Research 2024年第10期17卷 9202-9224页

作者： Xiran Du Jinlei Li Bin zhu jia zhu National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210023China School of Sustainable Energy and Resources Nanjing UniversitySuzhou 215163China

The potential of personal cooling technologies in reducing air conditioning energy consumption and enhancing human thermal comfort is *** review focuses on recent advancements in hierarchical structure design for innovative cooling *** with insights into fundamental heat transfer processes between the human body,textile,and the surroundings,we uncover key control *** the advanced hierarchical structure designs enabling effective radiation,sweat evaporation,conduction management,and integration of cold energy sources for realizing effective human body cooling are systematically ***,we explore multifunctional designs beyond cooling,including switchable cooling-heating and ***,we engage in discussions on unifying cooling performance tests and additional multiple requirements to make strides toward practical *** review is anticipated to be a valuable resource,providing the scientific and industrial communities with a quick grasp of past advancements,current challenges,and future directions in achieving effective human body cooling.

关键词： thermal comfort personal cooling textile hierarchical structures

Decontamination of Cr(Ⅵ) from water using sewage sludge-derived biochar: Role of environmentally persistent free radicals

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Chinese Journal of Chemical Engineering 2023年第4期56卷 97-103页

作者： Yuhan zhu jia Wei Jun Li Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing 100124China

Biochar is a well-known material for pollutant removal owing to its low cost and rich surface functionality. A kind of highly active substance, called environmentally persistent free radicals(EPFRs), can be produced in the preparation process of biochar, playing an important role in the removal of *** this study, sludge-derived biochars(SBC_(120) and SBC_(270)) were prepared by the hydrothermal carbonization under two temperatures(120℃ and 270℃) to investigate their removal abilities of Cr(Ⅵ). The maximum removal amounts of Cr(Ⅵ) by SBC_(120) and SBC_(270) were 16.58 and 22.93 mg·g^(-1), respectively. It was further revealed that the appearance of Cr(Ⅲ), as a result of EPFRs on sludge-derived biochar(SBC) transferred electrons to Cr(Ⅵ) in neutral solutions. That is to say, oxygen-centered(O-centered) EPFRs on SBC_(120) and carbon-centered(C-centered) EPFRs on SBC_(270) all could be used as electron donors to Cr(Ⅵ) to make it become Cr(Ⅲ). This study not only provides a theoretical basis for the mechanism of pollutants removal by sludge-derived biochar but also offers a new perspective on the direct effect of EPFRs on pollutants.

关键词： Sludge-derived biochar Environmentally persistent free radicals Chromium Removal Reduction

Cachazo-Svrcek-Witten rules for tree-level gluonic amplitudes revisited

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 20-31页

作者： Wen-jie Zhang Jun-Bao Wu Chuan-jie zhu Center for Joint Quantum Studies and Department of Physics School of ScienceTianjin UniversityTianjin 300350China Peng Huanwu Center for Fundamental Theory Hefei 230026China College of Mathematics and Physics Science Hunan University of Arts and ScienceChangde 415000China

We provide a new proof of Cachazo-Svrcek-Witten rules for tree-level gluonic *** a key step,we explicitly demonstrate the cancellation of spurious poles originating from the maximally helicity violating vertices in these *** achieve this,we introduce specially-defined two-off-shell-line sub-amplitudes and examine their residues at spurious poles.

关键词： general properties of perturbation theory perturbative calculations dualities in gauge field theories

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Emerging theory and phenomena in thermal conduction: A selective review

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Science China(Physics,Mechanics & Astronomy) 2022年第11期65卷 2-17页

作者： jie Chen jia He Dongkai Pan Xiaotian Wang Nuo Yang jiaojiao zhu Shengyuan A.Yang Gang Zhang Center for Phononics and Thermal Energy Science China-EU Joint Lab for NanophononicsMOE Key Laboratory of Advanced Microstructured MaterialsSchool of Physics Science and EngineeringTongji UniversityShanghai 200092China School of Energy and Power Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074China School of Physical Science and Technology Southwest UniversityChongqing 400715China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore Institute of High Performance Computing Agency for ScienceTechnology and Research(A*STAR)Singapore 138632Singapore

Recently, emerging phonon phenomena have been discovered and rapidly developed, which have become an active hot research topic. In this review article, we present state-of-the-art advances in several fascinating phonon transport phenomena. First, we summarize the recent progress on the wave nature of phonons, including phonon coherence and its effects on thermal conductivity and the topological properties of phonons. Then, we discuss the particle nature of phonons, including the weak coupling of phonons and the high-order phonon anharmonicity. Finally, we present the summary and a brief outlook. This review presents the advanced understanding of some emerging phonon phenomena in solid materials, which provides new opportunities for further advancement in a wide variety of applications.

关键词： phonon transport coherence topological phonon high-order phonon interaction

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Bioinspired flexible,high-strength,and versatile hydrogel with the fiberboard-and-mortar hierarchically ordered structure

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Nano Research 2021年第10期14卷 3643-3652页

作者： Han-Ping Yu Ying-jie zhu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The synthetic hydrogels with high water contents are promising for various applications,however,they usually exhibit low mechanical *** this work,inspired by the natural biological soft tissues,whose hierarchically ordered fibrous structures result in high strength and good flexibility,a flexible,high-strength,and versatile hydrogel with the fiberboard-and-mortar hierarchically ordered structure(HFMOS)is developed based on ultralong hydroxyapatite(HAP)nanowires and polyacrylic acid(PAA).The as-prepared HFMOS hydrogel has a high water content(~70 wt.%),dense structure,and excellent mechanical properties,and these properties are similar to those of the human cartilage and are superior to many hydrogels reported in the *** excellent mechanical properties of the HFMOS hydrogel originate from the combination of the fiberboard-and-mortar hierarchically ordered structure,reinforcement of ultralong HAP nanowires,strong interfacial strength,and multiple energy dissipation ***,thanks to the controllable components and injection procedure,the HFMOS hydrogel with a Janus structure is prepared for particular *** HFMOS hydrogel possesses abundant ordered water channels,and can be used for loading,release,and directed delivery of various functional ***,the as-prepared flexible,high-strength,and versatile HFMOS hydrogel possesses a great potential for various applications such as water purification,pollution treatment,biomedicine,nanofluidic devices,and high-performance structural materials.

关键词： hydrogel nanowire hydroxyapatite ordered structure

Twin-roll strip casting of advanced metallic materials

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Science China(Technological Sciences) 2022年第3期65卷 493-518页

作者： zhu ChenYang ZENG jie WANG WanLin School of Metallurgy and Environment Central South UniversityChangsha 410083China National Center for International Research of Clean Metallurgy Central South UniversityChangsha 410083China Department of Materials Science and Engineering Faculty of EngineeringNational University of SingaporeSingapore 117576Singapore

Metallic materials have historic and served as critical enablers of human progress,wealth,and wellbeing over ***,the global demand for the development of environment-friendly and energy-saving technology has been increasing,with the aim to support the sustainability of metallic ***-roll strip casting(TRC)is one of the most cutting-edge technologies and a near-net-shape manufacturing method in the steel industry,which conforms to the green fabrication trend of next-generation high-performance metallic *** utilizing the dominant characteristics of sub-rapid solidification,and integration of solidification,solid-state transformation,and deformation;TRC has become a meaningful way to deal with the most challenging issues in the processing of metallic materials,and made a significant contribution to materials ***,we review the TRC process of various metallic materials,including plain carbon steels,stainless steels,Fe-Si electrical steels,high-strength steels,clad steels,aluminum alloys,magnesium alloys,metallic glasses,and so *** paper offers an outlook of future opportunities for various advanced metallic materials development through the TRC process,and inspires more in-depth research.

关键词： twin-roll strip casting metallic materials steels alloys

Low-dimensional metal halide perovskites and related optoelectronic applications

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InfoMat 2020年第2期2卷 341-378页

作者： Pengchen zhu jia zhu National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesNanjing UniversityNanjingChina

Low-dimensional materials have pivotal significance in modern photonic,electronic,and optoelectronic areas due to their unique properties of the scale *** halide perovskites have revived in the optoelectronic fields recently,drawing intensive attention in photovoltaic devices,light-emitting diodes,lasers,photodetectors,and so *** to their three-dimensional counterparts,the role of low-dimensional perovskites is becoming crucial,requiring a comprehensive understanding and exploration *** this review,we examine low-dimensional perovskite of different forms and clarify various synthesis methods with morphological and dimensional ***,we also summarize potential optoelectronic applications based on their advantageous optical/electrical properties and enhanced mechanical integrity and ***,we propose a future perspective and possible developing directions in the exploration of novel perovskite-derived materials,new physics,and promising applications.

关键词： applications low-dimension metal halide perovskites synthesis