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review on the Progress and Issues in Liquid Tank Sloshing of Ships

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China Ocean Engineering 2023年第5期37卷 709-724页

作者： ZHANG Zhen TAO Ai-feng WU Qiao-rui XIE Yong-he Key Laboratory of Ministry of Education for Coastal disaster and Protection Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 210098China College of Naval Architecture and Maritime Zhejiang Ocean UniversityZhoushan 316022China

With the development of large liquid cargo ships,liquid tank sloshing has gradually become a hot research topic in the area of shipping and ocean *** tank sloshing,characterized by strong nonlinearity and randomness,not only affects the stability of the ship but also generates a huge impact force on the wall of the *** further investigate liquid tank sloshing,a comprehensive review is given on the research process of the most focused subjects of liquid *** the existing research will help to identify issues in the current field and provide useful *** methods for investigating sloshing,the research progress and the situations worldwide are *** advantages and defects of experiments and numerical simulations are also *** problems which need to be explored in the future are subsequently proposed.

关键词： naval architecture and marine engineering liquid tank sloshing liquid cargo ship large deformation progress review

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Numerical Calculation of Transient Thermal Characteristics of Nozzle Flowmeter

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Frontiers in Heat and Mass Transfer 2023年第1期21卷 245-264页

作者： Xin Li Shaohan Zheng Yuliang Zhang Minfeng Lv College of Mechanical Engineering Quzhou UniversityQuzhou324000China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310023China zhejiang Zhigao Machinery Co. Ltd.Quzhou324024China

This article aims to reveal the transient thermal characteristics of the solid domain in a nozzle flowmeter when measuring fluids of varying *** on finite element method,the transient numerical calculation of the thermal characteristics of each component of the nozzle flowmeter has been *** research shows that:as the fluid passes through the flowmeter,the high heat flux area inside the nozzle flowmeter gradually transfer from the center of the nozzle to the inlet and outlet,as well as the pressure tapping points upstream and downstream;High thermal stress zones are present near the upstream and downstream pressure tapping points and inlet and outlet area;High thermal deformation zones occur near the upstream and downstream pressure tapping points and eight slot nozzle.

关键词： Nozzle flowmeters numerical calculation transient thermal characteristics

Experimental Analysis of radial Centrifugal Pump Shutdown

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Fluid dynamics & Materials Processing 2024年第4期20卷 725-737页

作者： Xiao Sun Jiangbo Tong Yuliang Zhang Haibing Cai Wen Zhou Xiaoqi Jia Litao Ou School of Mechanical Engineering Hunan University of TechnologyZhuzhou412007China College of Mechanical Engineering Quzhou UniversityQuzhou324000China zhejiang Testing&Inspection Institute for Mechanical and Electrical Products Quality Co. Ltd.Hangzhou310014China Quzhou Special Equipment Inspection Center Quzhou324000China The zhejiang Provincial Key Lab of Fluid Transmission Technology Zhejiang Sci-Tech UniversityHangzhou310018China Zhuzhou Nanfang Valve Co. Ltd.Zhuzhou412000China

Centrifugal pumps are widely used in the metallurgy,coal,and building *** order to study the hydraulic characteristics of a closed impeller centrifugal pump during its shutdown in the so-called power frequency and frequency conversion modes,experiments were carried to determine the characteristic evolution of parameters such as speed,inlet and outlet pressure,head,flow rate and shaft power.A quasi-steady-state method was also used to further investigate these transient *** results show that,compared to the power frequency input,the performance parameter curves for the frequency conversion input are less volatile and *** characteristic time is longer and the response to shutdown is *** quasi-steady-state theoretical head-flow curves match the experimental head-flow curves more closely at low flow rates when the frequency conversion input is ***,in this case,the similarity law predicts the hydraulic performance more accurately.

关键词： Centrifugal pump power frequency frequency conversion shutdown external characteristic experimental study

Fundamental aspects of alkyne semi-hydrogenation over heterogeneous catalysts

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Nano research 2022年第12期15卷 10044-10062页

作者： Zhe Wang Qian Luo Shanjun Mao Chunpeng Wang Jinqi Xiong Zhirong Chen Yong Wang Advanced Materials and Catalysis Group Center of Chemistry for Frontier TechnologiesState Key Laboratory of Clean Energy UtilizationInstitute of CatalysisDepartment of ChemistryZhejiang UniversityHangzhou310028China College of Chemical and Biological Engineering Zhejiang UniversityHangzhou310028China

Alkyne semi-hydrogenation is extremely significant for the production of polymer-grade ethylene and lots of fine chemicals in modem *** efforts had been devoted to regulate the electronic and geometric structure of active ensembles for suppressing side reactions,including over-hydrogenation and *** strategies,such as alloying,surface decoration,atomization of metal centers,and others,were developed to promote the selective production of target alkenes in alkyne *** this review,the basic principles within reaction mechanisms and catalyst optimization would be discussed in *** an updated perspective to the fabrication of next-generation catalysts for alkyne semi-hydrogenation is also provided.

关键词： heterogeneous catalysis alkyne semi-hydrogenation metal-based catalysts catalytic mechanism

dMT:A model detecting multispecies of tea buds in multi-seasons

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 199-208页

作者： Taojie Yu Jianneng Chen Zhiwei Chen Yatao Li Junhua Tong Xiaoqiang du School of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Transplanting Equipment and Technology of zhejiang Province Hangzhou 310018China

In China,tea products made from fresh leaves characterized by one leaf with one bud(1L1B)are classified as“Famous Tea”,which has better taste and higher economic value,but suffers from a labor *** at picking automation,existing studies focus on visual detection of 1L1B,but algorithm validation is limited to a specific variety of tea sprouting in a certain harvest season at a certain location,which limits the engineering application of developed tea picking robots working in various natural tea *** address this gap,a deep learning model dMT(detecting multispecies of tea)based on YOLOX-S was proposed in this *** dMT network takes YOLOX-S as a baseline and adds ECA-Net to the CSP darknet and FPN of *** average precision(AP),precision,and recall of dMT are 94.23%,93.39%,and 88.02%,respectively,for detecting 1L1B sprouting in spring;93.92%,93.56%,and 87.88%,respectively,for detecting 1L1Bsprouting in *** experimental results are better than those of the five current object detection *** fine-tuning the dMT network with another dataset composed of multiple tea varieties,the dMT network can detect 1L1B for different varieties of tea in multiple picking *** results can promote the engineering application of picking automation of fresh tea leaves.

关键词： tea buds detection model multispecies of tea multi-season

Engineering phosphorus-containing lignin for epoxy biocomposites with enhanced thermal stability,fire retardancy and mechanical properties

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Journal of Materials Science & Technology 2023年第36期167卷 82-93页

作者： Anlin Zhang Jianzhong Zhang Lina Liu Jinfeng dai Xinyu Lu Siqi Huo Min Hong Xiaohuan Liu Mark Lynch Xuesen Zeng Paulomi Burey Pingan Song College of Chemistry and Materials Science Zhejiang A&F UniversityHangzhou 311300China Centre for Future Materials University of Southern QueenslandSpringfieldQLD 4300Australia College of Life Science Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and ConservationTaizhou UniversityTaizhou 318000China School of Agriculture and Environmental Science University of Southern QueenslandSpringfieldQLD 4300Australia

Fabricating a high-performing thermoset using bio-based flame retardant is critical for the sustain-able development of engineering materials with superior fire safety and robust mechanical ***,the epoxy(EP)composites with the industrial requirements are manufactured with a novel high-efficient,lignin-based flame retardant named dAL-x,which is fabricated by grafting 9,10-dihydro-9-oxa-10-phosphaze-10-oxide(dOPO)onto *** resulting dAL-x/EP composite exhibits excellent flame retardancy with a desirable UL-94 V-0 rating and a satisfactory limiting oxygen index(LOI)of 29.8%due to the appropriate phosphorus content of dAL-x with adjustable molecular chain ***-over,the dAL-x/EP composite shows an unexpected improvement in the elastic modulus(∼36%)and well-preserved strength and ductility compared with those of pure *** work offers a feasible strat-egy for creating efficient bio-based flame retardants utilizing industrial waste lignin and preparing high-performance EP composites that meet the demanding requirement of fire retardancy in industries,con-tributing to the circular economy and sustainability.

关键词： Epoxy resin Lignin Flame retardancy Thermal stability Mechanical property

Homojunction structure amorphous oxide thin film transistors with ultra-high mobility

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Journal of Semiconductors 2023年第5期44卷 19-26页

作者： rongkai Lu Siqin Li Jianguo Lu Bojing Lu ruqi Yang Yangdan Lu Wenyi Shao Yi Zhao Liping Zhu Fei Zhuge Zhizhen Ye State Key Laboratory of Silicon Materials Key Laboratory for Biomedical Engineering of Ministry of EducationSchool of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials Institute of WenzhouZhejiang UniversityWenzhou 325006China department of Electronic Science and Technology College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China

Amorphous oxide semiconductors(AOS)have unique advantages in transparent and flexible thin film transistors(TFTs)applications,compared to low-temperature polycrystalline-Si(LTPS).However,intrinsic AOS TFTs are difficult to obtain field-effect mobility(μFE)higher than LTPS(100 cm^(2)/(V·s)).Here,we design ZnAlSnO(ZATO)homojunction structure TFTs to obtainμFE=113.8 cm^(2)/(V·s).The device demonstrates optimized comprehensive electrical properties with an off-current of about1.5×10^(-11)A,a threshold voltage of–1.71 V,and a subthreshold swing of 0.372 V/*** are two kinds of gradient coupled in the homojunction active layer,which are micro-crystallization and carrier suppressor concentration gradient distribution so that the device can reduce off-current and shift the threshold voltage positively while maintaining high field-effect *** research in the homojunction active layer points to a promising direction for obtaining excellent-performance AOS TFTs.

关键词： thin film transistors homojunction carrier mobility amorphous oxides

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Precise mode control of laser-written waveguides for broadband,low-dispersion 3d integrated optics

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Light(Science & Applications) 2024年第6期13卷 1186-1195页

作者： Yuying Wang Lijing Zhong Kuen Yao Lau Xuhu Han Yi Yang Jiacheng Hu Sergei Firstov Zhi Chen Zhijun Ma Limin Tong Kin Seng Chiang dezhi Tan Jianrong Qiu College of Optical Science and Engineering Zhejiang University310027HangzhouChina Institute of Light+X Science and Technology College of Information Science and EngineeringNingbo University315211NingboChina School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University215006SuzhouChina Prokhorov General Physics Institute of the russian Academy of Sciences Dianov Fiber Optics Research Center38 Vavilov str.Moscow119333Russia zhejiang Lab 311121HangzhouChina College of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and Technology650093KunmingYunnanChina department of Electrical Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong SARChina School of Materials Science and Engineering Zhejiang University310027HangzhouChina

Three-dimensional(3d)glass chips are promising waveguide platforms for building hybrid 3d photonic circuits due to their 3d topological capabilities,large transparent windows,and low coupling *** present,the key challenge in scaling down a benchtop optical system to a glass chip is the lack of precise methods for controlling the mode field and optical coupling of 3d waveguide ***,we propose an overlap-controlled multi-scan(OCMS)method based on laser-direct lithography that allows customizing the refractive index profile of 3d waveguides with high spatial precision in a variety of *** the basis of this method,we achieve variable mode-field distribution,robust and broadband coupling,and thereby demonstrate dispersionless LP21-mode conversion of supercontinuum pulses with the largest deviation ofdB in coupling ratios on 210 nm *** approach provides a route to achieve ultra-broadband and low-dispersion coupling in 3d photonic circuits,with overwhelming advantages over conventional planar waveguide-optic platforms for on-chip transmission and manipulation of ultrashort laser pulses and broadband supercontinuum.

关键词： waveguide mode dispersion

Effect of rice cultivar on greenhouse-gas emissions from rice-fish co-culture

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The Crop Journal 2024年第3期12卷 888-896页

作者： Kexin Xie Mengjie Wang Xiaodan Wang Fengbo Li Chunchun Xu Jinfei Feng Fuping Fang China National rice research Institute Hangzhou 310006ZhejiangChina

In aquaculture,co-culturing rice with fish may mitigate greenhouse-gas *** this study,co-culture of four rice cultivars in a laboratory-scale rice–fish system reduced CH_(4)and N_(2)O emissions relative to fish *** in CH_(4)and N_(2)O emissions among rice cultivars primarily stem from the differential effects of rice plants on plant-mediated CH_(4)transport,CH_(4)oxidation and nitrogen absorption.

关键词： Greenhouse gas emissions Aquaculture rice-fish system rice cultivar

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