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Development of hydraulic power unit and accumulator charging circuit for electricity generation,storage and distribution

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Journal of Harbin institute of Technology(New Series) 2008年第1期15卷 60-64页

作者：姜继海刘海昌 School of Mechatronic Engineering Harbin Institute of Technology

It is the purpose of the present paper to convert hydraulic energy to electric energy and saves both the pressure and electrical energy for re - use during the next system upstroke using two secondary units coupled to induction motor to drive cylinder loads. During upstroke operation, the variable pump/motor （P/M） driven by both electric motor and the second （P/M） works as hydraulic pump and output flow to the cylinders which drive the load. During load deceleration, the cylinders work as pump while the operation of the two secondary units are reversed, the variable （P/M） works as a motor generating a torque with the electric motor to drive the other （P/M） which transforms mechanical energy to hydraulic energy that is saved in the accumulator. When the energy storage capacity of the accumulator is attained as the operation continues, energy storage to the accumulator is thermostatically stopped while the induction motor begins to work as a generator and generates electricity that is stored in the power distribution unit. Simulations were performed using a limited PT2 Block, i.e. 2nd-order transfer function with limitation of slope and signal output to determine suitable velocity of the cylinder which will match high performance and system stability. A mathematical model suited to the simulation of the hydraulic accumulator both in an open-or close-loop system is presented. The quest for improvement of lower energy capacity storage, saving and re-utilization of the conventional accumulator resulting in the short cycle time usage of hydraulic accumulators both in domestic and industrial purposes necessitates this research. The outcome of the research appears to be very efficient for generating fluctuation free electricity, power quality and reliability, energy saving/reutilization and system noise reduction.

关键词： electricity generation accumulator charging circuit hydraulic accumulator energy-reutilization

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Bidirectional rotating direct-current triboelectric nanogenerator with self-adaptive mechanical switching for harvesting reciprocating motion

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International Journal of Extreme Manufacturing 2024年第4期6卷 324-335页

作者： Donghan Lee Joonmin Chae Sumin Cho Jong Woo Kim Awais Ahmad Mohammad Rezaul Karim Moonwoo La Sung Jea Park Dongwhi Choi Department of mechanical Engineering(Integrated Engineering Program) Kyung Hee University1732 Deogyeong-daeroYonginGyeonggi 17104Republic of Korea Department of Chemistry University of LahoreLahorePakistan Department of mechanical Engineering College of EngineeringKing Saud UniversityRiyadh 11421Saudi Arabia School of mechanical Engineering Korea University of Technology and Education1600 Chungjeol-roCheonanChungnam 31253Republic of Korea

Amid the growing interest in triboelectric nanogenerators(TENGs)as novel energy-harvesting devices,several studies have focused on direct current(DC)TENGs to generate a stable DC output for operating electronic ***,owing to the working mechanisms of conventional DC TENGs,generating a stable DC output from reciprocating motion remains a ***,we propose a bidirectional rotating DC TENG(BiR-TENG),which can generate DC outputs,regardless of the direction of rotation,from reciprocating *** distinct design of the BiR-TENG enables the mechanical rectification of the alternating current output into a rotational-direction-dependent DC ***,it allows the conversion of the rotational-direction-dependent DC output into a unidirectional DC output by adapting the configurations depending on the rotational *** to these tailored design strategies and subsequent optimizations,the BiR-TENG could generate an effective unidirectional DC *** of the BiR-TENG for the reciprocating motions of swinging doors and waves were demonstrated by harnessing this *** study demonstrates the potential of the BiR-TENG design strategy as an effective and versatile solution for energy harvesting from reciprocating motions,highlighting the suitability of DC outputs as an energy source for electronic devices.

关键词： direct-current triboelectric nanogenerator mechanical rectification self-adaptive mechanical design harvesting reciprocation motion

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Intrinsic ferroelectrics and carrier doping-induced metallic multiferroics in an atomic wire

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Journal of Materiomics 2023年第5期9卷 892-898页

作者： Tao Xu Jingtong Zhang Chunyu Wang Xiaoyuan Wang Takahiro Shimada Jie Wang Hongxin Yang Ningbo institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo315201China Department of mechanical Engineering and Science Kyoto UniversityNishikyo-kuKyoto615-8540Japan Department of Engineering Mechanics School of Aeronautics and Astronautics Zhejiang UniversityHangzhou310027China Zhejiang Laboratory Hangzhou311100ZhejiangChina Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and TechnologyShanghai200237China

Low-dimensional multiferroic metals characterized by the simultaneous coexistence of ferroelectricity,conductivity,and magnetism hold tremendous potential for scientific and technological ***,the mutually exclusive mechanisms among these properties impede the discovery of multifunctional conducting multiferroics,especially at the ***,based on first-principles calculations,we design and demonstrate intrinsic one-dimensional(1D)ferroelectrics and carrier dopinginduced metallic multiferroics in an atomicWOF4 ***4 atomic wire that can be derived from a 1D van derWaals crystal exhibits pronounced ferroelectricity manifested in the form of large cooperative atomic *** performing Monte Carlo simulations with an effective Hamiltonian method,we obtain the nanowire that can sustain a high Curie temperature,indicating its potential for roomtemperature ***,doping with electrons is found to induce magnetism and metallic conductivity that coexists with the ferroelectric distortion in the *** appealing properties in conjunction with the experimental feasibility enable the doped WOF4 nanowire to act as a promising atomic-scale multifunctional material.

关键词： 1D materials Ferroelectrics Metallic multiferroics First-principles calculations Electron doping

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Recent research of peptide-based hydrogel in nervous regeneration

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Bioactive Materials 2024年第10期40卷 503-523页

作者： Chunmei Xie Yueyang Chen Lang Wang Kin Liao Bin Xue Yulong Han Lan Li Qing Jiang State Key Laboratory of Mechanics and Control of mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China Advanced Digital and Additive Manufacturing Center Khalifa University of Science and TechnologyPo Box 127788Abu DhabiUnited Arab Emirates National Laboratory of Solid State Microstructures Department of PhysicsNanjing UniversityNanjingChina State Key Laboratory of Pharmaceutical Biotechnology Division of Sports Medicine and Adult Reconstructive SurgeryDepartment of Orthopedic SurgeryDrum Tower Hospital Affiliated to Medical School of Nanjing UniversityNanjingChina Jiangsu Engineering research Center for 3D Bioprinting NanjingChina institute of Medical 3D Printing Nanjing UniversityNanjingChina

Neurological disorders exert significantly affect the quality of life for patients,necessitating effective strategies for nerve *** traditional autologous nerve transplantation and emerging therapeutic approaches encounter scientific challenges due to the complex nature of the nervous system and the unsuitability of the surrounding environment for cell *** engineering techniques offer a promising path for *** neural tissue engineering relies on modulating cell differentiation behavior and tissue repair by developing biomaterials that mimic the natural extracellular matrix(ECM)and establish a threedimensional ***-based hydrogels have emerged as a potent option among these biomaterials due to their ability to replicate the structure and complexity of the *** review aims to explore the diverse range of peptide-based hydrogels used in nerve regeneration with a specific focus on dipeptide hydrogels,tripeptide hydrogels,oligopeptide hydrogels,multidomain peptides(MDPs),and amphiphilic peptide hydrogels(PAs).Peptide-based hydrogels offer numerous advantages,including biocompatibility,structural diversity,adjustable mechanical properties,and degradation without adverse ***,hydrogels formed from self-assembled polypeptide nanofibers,derived from amino acids,show promising potential in engineering neural tissues,outperforming conventional materials like alginate,poly(ε-caprolactone),and ***,the simple design and cost-effectiveness of dipeptidebased hydrogels have enabled the creation of various functional supramolecular structures,with significant implications for nervous system *** hydrogels are expected to play a crucial role in future neural tissue engineering *** review aims to highlight the benefits and potential applications of peptidebased hydrogels,contributing to the advancement of neural tissue engineering.

关键词： Self-assembled Dipeptide Cyclic dipeptide Hydrogels Nervous regeneration

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Triaxial high-gaccelerometer of microelectro mechanical systems

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Journal of Beijing institute of Technology 2015年第4期24卷 427-431页

作者：何昫张振海李科杰林然 School of Mechatronical Engineering Beijing Institute of Technology

A triaxial high-g accelerometer of microelectro mechanical systems （MEMS） has a struc- ture of multi-chips combination and will be used in aerospace field, civil and military fields. The ac- celerometer can measure the acceleration of the carrier. The chips with island-membrane structures on its back surfaces are made by MEMS dry processing. The chip is reasonable and can work well under high impact load; Titanium alloy base is also stronger in high shock environment, these are proved by finite element analysis. Finally, the MEMS combined triaxial high-g accelerometer is vali- dated by high impact calibration experiments in order to get a key performance index, including range, sensitivity and transverse sensitivity and so on. These data can satisfy the need of design but some problems remain, these will be eliminated by improvement of the processing technology and materials.

关键词： combined finite element analysis triaxial high-g accelerometer

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One-step In-situ Synthesis of Vacancy-rich CoFe2O4@Defective Graphene Hybrids as Bifunctional Oxygen Electrocatalysts for Rechargeable Zn-Air Batteries

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Chemical research in Chinese Universities 2020年第3期36卷 479-487页

作者： WANG X in ZHUANG Linzhou JIA Yi ZHANG Lijie YANG Qin XU Wenjia YANG Dongjiang YAN Xuecheng ZHANG Longzhou ZHU Zhonghua BROWN Christopher L YUAN Pei YAO Xiangdong School of Environment and Science ami Queensland Micro-and Nanotechnology CentreGriffith UniversityNathan CampusQueensland 4111Australia School of Chemistry Physics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQueensland 4000Australia Collaborative Innovation Center for Mahne Biomass Fibers Materials ami Textiles of Shandong ProvinceInstitute of Marine Biobased MaterialsCollege of Environmental Science and EngineeringQingdao UniversityQingdao 266071P.R.China National Engineering research Center of Chemical Fertilizer Catalyst College of Chemical EngineeringFuzhou UniversityFuzhou 350002P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin UniversityChangchun 130012P.R.China

Developing efficient catalysts toward both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is the core task for rechargeable metal-air *** integration of two active components should be an effective method to produce the bifunctional catalysts in principle,traditional techniques still can not attain fine tunable surface structure during material-hybridization ***,we present a facile short-time in-situ argon(Ar)plasma strategy to fabricate a high-performance bifunctional hybrid catalyst of vacancy-rich CoFe2O4 synergized with defective graphence(r-CoFe2O4@DG).Reflected by the low voltage gap of 0.79V in two half-reaction measurements,the striking capability to catalyze ORR/OER endows it excellent and durable performance in rechargeable Zn-air batteries,with a maximum power density of 155.2mW/cm^2 and robust stablility(up to 60h).Further experimental and theoretical studies validate its remarkable bifunctional energetics root from plasma-induced surface vacancy defects and interfacial charge polarization between DG and CoFe2O4.

关键词： Defect CoFe2O4 Oxygen reduction Oxygen evolution Zn-air battery

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A Novel Artificial Neuron-Like Gas Sensor Constructed from CuS Quantum Dots/Bi2S3 Nanosheets

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Nano-Micro Letters 2022年第1期14卷 167-181页

作者： Xinwei Chen Tao Wang Jia Shi Wen Lv Yutong Han Min Zeng Jianhua Yang Nantao Hu Yanjie Su Hao Wei Zhihua Zhou Zhi Yang Yafei Zhang Key Laboratory of Thin Film and Microfabrication(Ministry of Education) Department of Micro/Nano ElectronicsSchool of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Real-time rapid detection of toxic gases at room temperature is particularly important for public health and environmental *** sensors based on conventional bulk materials often suffer from their poor surface-sensitive sites,leading to a very low gas adsorption ***,the charge transportation efficiency is usually inhibited by the low defect density of surface-sensitive area than that in the *** this work,a gas sensing structure model based on CuS quantum dots/Bi_(2)S_(3) nanosheets(CuS QDs/Bi_(2)S_(3) NSs)inspired by artificial neuron network is *** analysis by density functional calculation revealed that CuS QDs and Bi_(2)S_(3) NSs can be used as the main adsorption sites and charge transport pathways,***,the high-sensitivity sensing of NO_(2) can be realized by designing the artificial neuron-like *** experimental results showed that the CuS QDs with a size of about 8 nm are highly adsorbable,which can enhance the NO_(2) sensitivity due to the rich sensitive sites and quantum size *** Bi_(2)S_(3) NSs can be used as a charge transfer network channel to achieve efficient charge collection and *** neuron-like sensor that simulates biological smell shows a significantly enhanced response value(3.4),excellent responsiveness(18 s)and recovery rate(338 s),low theoretical detection limit of 78 ppb,and excellent selectivity for NO_(2).Furthermore,the developed wearable device can also realize the visual detection of NO2 through real-time signal changes.

关键词： Artificial neuron-like gas sensor Heterostructure design Nitrogen dioxide detection Wearable device

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Comparison between hospital- and community-acquired septic shockin children: a single-center retrospective cohort study

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World Journal of Pediatrics 2022年第11期18卷 734-745页

作者： Guo-Yun Su Chao-Nan Fan Bo-Liang Fang Zheng-De Xie Su-Yun Qian Pediatric Intensive Care Unit National Center for Children’s HealthBeijing Children’s HospitalCapital Medical UniversityNo.56 Nan-Li-Shi RoadBeijing 100045China research Unit of Critical Infection in Children Chinese Academy of Medical Sciences(DIFMS)2019-12M-5-026BeijingChina Beijing Key Laboratory of Pediatric Respiratory Infection Diseases Key Laboratory of Major Diseases in ChildrenMinistry of EducationNational Clinical Research Center for Respiratory DiseasesResearch Unit of Critical Infection in ChildrenChinese Academy of Medical Sciences2019RU016Laboratory of Infection and VirologyBeijing Pediatric Research InstituteBeijing Children’s HospitalNational Center for Children’s HealthCapital Medical UniversityBeijingChina

Background We explored the differences in baseline characteristics, pathogens, complications, outcomes, and risk factorsbetween children with hospital-acquired septic shock (HASS) and community-acquired septic shock (CASS) in the pediatricintensive care unit (PICU).Methods This retrospective study enrolled children with septic shock at the PICU of Beijing Children’s Hospital from January1, 2016, to December 31, 2019. The patients were followed up until 28 days after shock or death and were divided intothe HASS and CASS group. Logistic regression analysis was used to identify risk factors for *** A total of 298 children were enrolled. Among them, 65.9% (n = 91) of HASS patients had hematologic/oncologicdiseases, mainly with Gram-negative bacterial bloodstream infections (47.3%). Additionally, 67.7% (n = 207) of CASSpatients had no obvious underlying disease, and most experienced Gram-positive bacterial infections (30.9%) of the respiratoryor central nervous system. The 28-day mortality was 62.6% and 32.7% in the HASS and CASS groups, respectively(P mechanical ventilation (OR = 8.114, 95% CI = 1.806–36.465, P = 0.006) were risk factors for 28-daymortality in patients with *** The underlying diseases, pathogens, complications, prognosis, and mortality rates varied widely between theHASS and CASS groups. The predictors of 28-day mortality were different between HASS and CASS pediatric patientswith septic shock.

关键词： 28-day mortality Children Community-acquired septic shock Hospital-acquired septic shock Septic shock

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Establishing age-group specific reference intervals of human salivary proteome and its preliminary application for epilepsy diagnosis

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Science China Life Sciences 2024年

作者： Nianci Xue Xia Xia Yini Wang Xianju Li Nairen Zheng Yi Wang Baoying Gong Bin Zhang Yanjia Chen Yue Chen Yanjuan Li Hong Cao Wofeng Liu Hongqiang Huang Shuo Yang Lisen Sui Lin Meng Jianwen Guo Jun Qin State Key Laboratory of Traditional Chinese Medicine Syndrome State Key Laboratory of Dampness Syndrome of Chinese Medicine SyndromeDepartment of NeurologyThe Secondary Affiliated Hospital of Guangzhou University of Chinese MedicineGuangdong Provincial Hospital of Chinese MedicineGuangdong Provincial Academy of Chinese Medical Sciences State Key Laboratory of Medical Proteomics Beijing Proteome Research CenterNational Center for Protein Sciences (Beijing)Beijing Institute of Lifeomics Guangzhou University of Chinese Medicine Guangdong mechanical&electrical Polytechnic Department of epilepsy The Secondary Hospital of Guangzhou University of Chinese MedicineGuangdong Provincial Hospital of Traditional Chinese Medicine Guangzhou Cadre and Talent Health Management Center (Guangzhou 11th People's Hospital)

Salivary proteins serve multifaceted roles in maintaining oral health and hold significant potential for diagnosing and monitoring diseases due to the non-invasive nature of saliva ***,the clinical utility of current saliva biomarker studies is limited by the lack of reference intervals (RIs) to correctly interpret the testing ***,we developed a rapid and robust saliva proteome profiling workflow,obtaining coverage of>1,200 proteins from a 50-μL unstimulated salivary flow with 30 min *** the workflow,we investigated protein variation in a cohort of 1,743 healthy *** significant differences in non-linear saliva proteomes among age groups resulted in the establishment of age-related RIs covering 1,123 salivary protein *** then utilized a cohort of 30 epilepsy patients as a case study to illustrate the practical application of RIs in identifying disease-enriched outlier proteins,elucidating their cellular origins,determining disease diagnosis,and visualizing outlier proteins in each epilepsy *** study showed the classification model based on the RI achieved PR-AUC of 0.815 (95%CI:0.813–0.826).Additionally,we validated these results in an independent test ***,the epilepsy cohort could be further stratified into 2 major subtypes,with one subtype characterized by disrupted metabolic proteins and containing mostly Focal Cortical Dysplasia (FCD) type III epilepsy ***,our study provided a proof-of-principle workflow for the use of salivary proteome for health monitoring,epilepsy diagnosis and subtyping.

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Customized design for Ergonomic Products via Additive Manufacturing Considering Joint Biomechanics

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Chinese Journal of mechanical Engineering(Additive Manufacturing Frontiers) 2023年第3期2卷 84-94页

作者： Jinghua Xu Zhengxin Tu Shuyou Zhang Jianrong Tan Guanyun Wang State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou310058China Zhejiang Key Lab of Advanced Manufacturing Technology Zhejiang UniversityHangzhou310058China Zhejiang-Singapore Innovation and AI Joint research Lab Zhejiang UniversityHangzhou310058China institute of design Engineering Zhejiang UniversityHangzhou310058China

This paper presents a customized design method for ergonomic products via additive manufacturing(AM)con-sidering joint *** ergonomic customized design model can be built based on kinesiology involving human joint *** of the human bone can be reconstructed from X-rays,computed tomog-raphy(CT),magnetic resonance imaging(MRI),and direct 3D *** conceptual and detailed design of customized products were implemented on ergonomic shoes and insoles.A lightweight lattice structure with vari-able porosity was generated via structural topology optimization for an ergonomic customized ***,the upper surface of the custom-made insole may adhere perfectly to the plantar surface of the patient,resulting in a lower peak plantar *** element analysis(FEA)can be employed to simulate the static or dynamic biomechanical *** conceptual ergonomic products were forwarded to the machine and fabricated via AM,driven by visual digital twin *** experiments proved that a customized design suitability method for wearable ergonomic products via 3D printing is specifically tailored to the rehabilitation needs of individual customers,while consuming the least cost,time,and materials.

关键词： Customized design Wearable ergonomic products Additive manufacturing(AM) Human joint biomechanics Structural topology optimization

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