检索结果-内蒙古大学图书馆

Design and development of an integrated enset processing machine suitable for central highland farmers of west shewa zone Ethiopia

引用

Discover Agriculture 2025年第1期3卷 1-26页

作者： Jima, Beka Adugna Kolhe, Kishor Purushottam Jiru, Moera Gutu Agricultural Machinery Engineering Program Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering at Adama Science and Technology University Adama Ethiopia Department of Mechanical Engineering School of Mechanical Chemical and Materials Engineering at Adama Science and Technology University Adama Ethiopia

The development of Integrated Enset processing technology is significant for the easy availability of stable food in the current condition for fulfilling the pangs of hunger in Ethiopia, currently; individual manual technologies such as decortication, corm granting, bulla extraction, and fermenting techniques eventually contribute to utilizing food security such as Kocho, which is not affordable for the marginal farmers of Ethiopia. However, there is a lack of integrated compromise of the all-function process of corm granting, decortication, and pulverization in one machine wholesome of the product such as Kocho, and bulla within consuming time and labor. Therefore, it is decided to design and develop an integrated enset processing machine for central high land of Ethiopian farmers with high-quality production. The physical and mechanical properties of the enset is studied to get an efficient and robust design of the various components. The overall design and development of proposed machine components were carried out at Adama science and Technology University, Ethiopia by using ANSYS 2023 R1 software by considering the engineering economics and material specifications as per ASTM standards. The process parameters of the proposed machine are identified as feed rate, drum speed, concave to drum clearance, power requirement, etc. Also, the enset characteristics were considered as decorticating and granting, fiber cutting resistance, fiber length, dimension, shape, and weight. The overall developed enset integrated machine assembles are analyzed for granting and decorticating with drum clearance and bulla extraction throughput capacity, reliability, simplicity, safety, and overall cost. The machine's safety from a Design Perspective is checked and validated by a simulation study on the critical parts subjected to higher stresses. The cost of available individual decorticators, granting, pulverized, and bulla squeezer machines is costly to the farmer’s community. Theref

关键词：

来源：评论

学校读者我要写书评

暂无评论

Ultrahigh Energy and Power Density in Ni-Zn Aqueous Battery via Superoxide-Activated Three-Electron Transfer

引用

Nano-Micro Letters 2025年第4期17卷 63-76页

作者： Yixue Duan Bolong Li Kai Yang Zheng Gong Xuqiao Peng Liang He Derek Ho School of Mechanical Engineering State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground EngineeringSichuan UniversityChengdu 610065People’s Republic of China Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077People’s Republic of China Hong Kong Centre for Cerebro-Cardiovascular Health Engineering Hong Kong Science ParkHong Kong 999077People’s Republic of China School of Mechanical Engineering Sichuan UniversityChengdu 610065People’s Republic of China

Aqueous Ni-Zn microbatteries are safe,reliable and inexpensive but notoriously suffer from inadequate energy and power ***,we present a novel mechanism of superoxide-activated Ni substrate that realizes the redox reaction featuring three-electron transfers(Ni↔Ni3+).The superoxide activates the direct redox reaction between Ni substrate and KNiO_(2)by lowering the reaction Gibbs free energy,supported by in-situ Raman and density functional theory *** prepared chronopotentiostatic superoxidation-activated Ni(CPS-Ni)electrodes exhibit an ultrahigh capacity of 3.21 mAh cm^(-2)at the current density of 5 mA cm^(-2),nearly 8 times that of traditional one-electron processes *** under the ultrahigh 200 mA cm^(-2)current density,the CPS-Ni electrodes show 86.4%capacity retention with a Columbic efficiency of 99.2%after 10,000 *** CPS-Ni||Zn microbattery achieves an exceptional energy density of 6.88 mWh cm^(-2)and power density of 339.56 mW cm^(-2).Device demonstration shows that the power source can continuously operate for more than 7 days in powering the sensing and computation intensive practical application of photoplethysmographic waveform *** work paves the way to the development of multi-electron transfer mechanisms for advanced aqueous Ni-Zn batteries with high capacity and long lifetime.

关键词： Superoxide Multiple electron transfer Ni aqueous battery AIoT power source Wearable health monitoring

来源：评论

学校读者我要写书评

暂无评论

High-Pressure Torsion Affects mechanical Properties, Electrochemical Behavior, and Cellular Response to a Biomedical Ti-Nb-Zr-Ta Alloy

引用

materials Transactions 2025年第5期66卷 490-500页

作者： Sahay, Saurish Kesavan, Praveenkumar Yadav, Mayank Kumar Nilawar, Sagar Manivasagam, Geetha Chatterjee, Kaushik Department of Mechanical Engineering Vellore Institute of Technology Vellore632 014 India Department of Materials Engineering Indian Institute of Science Bangalore560012 India Department of Mechanical and Industrial Engineering Tallinn University of Technology Tallinn19086 Estonia Centre for Biomaterials Cellular and Molecular Theranostics CBCMT Vellore Institute of Technology Vellore632 014 India School of Healthcare Science and Engineering Vellore Institute of Technology Vellore632 014 India

This study investigates the microstructural evolution, mechanical properties, and biological response of the Ti-34Nb-2Ta-3Zr-0.5O (mass%) alloy processed by High-Pressure Torsion (HPT) at ambient temperature, focusing on its suitability for biomedical applications. The HPT process significantly increased the fraction of high-angle grain boundaries, particularly in the range of 50–60°. Grain refinement was observed after both 2 and 4 turns of HPT;ultra-fine grain fraction increased with an increase in the number of turns of HPT. No phase transformations occurred during deformation. The bulk texture indicates the formation of a fibrous texture post-HPT processing. The hardness of the samples increased up to 348 HV after 4 turns compared to the alloy not subjected to HPT (280 HV). The HPT samples demonstrated higher Ecorr and lower Icorr values, indicating improved corrosion resistance in phosphate-buffered saline. In vitro cell studies revealed that HPT did significantly affect the viability and growth of osteoblasts on the TNTZ alloy. Taken together, these results establish HPT as a promising processing route for enhancing the biomedical performance of TNTZ toward developing high-performance bone implants. [doi:10.2320/***-MC2024013] ©2025 The Japan Institute of Metals and materials.

关键词： Microhardness

来源：评论

学校读者我要写书评

暂无评论

Unlocking Novel Functionality:Pseudocapacitive Sensing in MXene-Based Flexible Supercapacitors

引用

Nano-Micro Letters 2025年第4期17卷 212-229页

作者： Eunji Kim Seongbeen Kim Hyeong Min Jin Gyungtae Kim Hwi-Heon Ha Yunhui Choi Kyoungha Min Su-Ho Cho Hee Han Chi Won Ahn Jaewoo Roh Il-Kwon Oh Jinwoo Lee Yonghee Lee Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea National Nano Fab Center(NNFC) 291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Department of Organic Materials Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Materials Science and Engineering Chungnam National University99 Daehak-RoYuseong-GuDaejeon 34134Republic of Korea Department of Nano&Advanced Materials Science and Engineering Kyungpook National University2559Gyeongsang-DaeroSangju-SiGyeongsangbuk-Do 37224Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea

Extensively explored for their distinctive pseudocapacitance characteristics,MXenes,a distinguished group of 2D materials,have led to remarkable achievements,particularly in the realm of energy storage *** work presents an innovative Pseudocapacitive *** key lies in switching the energy storage kinetics from pseudocapacitor to electrical double layer capacitor by employing the change of local pH(-log[H^(+)])in MXene-based flexible supercapacitors during *** sensing is observed in acidic electrolyte but absent in neutral *** shearing during bending causes liquid-crystalline MXene sheets to increase in their degree of anisotropic *** blocking of H+mobility due to the higher diffusion barrier,local pH *** electrochemical energy storage kinetics transits from Faradaic chemical protonation(intercalation)to non-Faradaic physical *** utilize the phenomenon of capacitance change due to shifting energy storage kinetics for strain sensing *** developed highly sensitive Pseudocapacitive Sensors feature a remarkable gauge factor(GF)of approximately 1200,far surpassing conventional strain sensors(GF:~1 for dielectric-cap sensor).The introduction of the Pseudocapacitive Sensor represents a paradigm shift,expanding the application of pseudocapacitance from being solely confined to energy devices to the realm of multifunctional *** technological leap enriches our understanding of the pseudocapacitance mechanism of MXenes,and will drive innovation in cutting-edge technology areas,including advanced robotics,implantable biomedical devices,and health monitoring systems.

关键词： MXenes Supercapacitors Pseudocapacitive sensing Local pH Operando measurements

来源：评论

学校读者我要写书评

暂无评论

Efficient Recycling of Magnesium Alloys via Partial Distillation Using Gravity-Multiple Effect Thermal System (G-METS)

Efficient Recycling of Magnesium Alloys via Partial Distilla...

引用

Magnesium Technology Symposium, 2025, held as part of the TMS Annual Meeting and Exhibition, TMS 2025

作者： McArthur Sehar, Daniel Saito, Kenichi Telgerafchi, Armaghan Gallego, Maya Sridhar, Meera Iurkovskyi, Artem Powell, Adam Department of Materials Science and Engineering Program Worcester Polytechnic Institute 100 Institute Rd. WorcesterMA01609 United States Department of Mechanical Engineering Shibaura Institute of Technology Tokyo Japan Department of Mechanical Engineering Worcester Polytechnic Institute WorcesterMA United States

ISBN: (纸本)9783031810602

MagnesiumMagnesium’s remarkable stiffnessStiffness-to-weight and high strengthStrength-to-weight ratios could enable substantial vehicle lightweighting versus aluminum and steel. However, primary production is very energy- and emissions-intensive, and recyclingRecycling cannot cost-effectively produce magnesiumMagnesium of sufficient purity for die casting and other structural applications. Distillation can produce high-purity magnesiumMagnesium but is capital- and energy-intensive. Gravity-Driven Multiple Effect Thermal System (G-METS) is a continuous low-pressure magnesiumMagnesium distillation process used in primary production or recyclingRecycling in which heat re-use leads to just 0.5–1 kWh energy consumption per kgMg Mg product—which is 80–90% less energy than current Mg distillation. This paper presents new partial distillation experiments showing 99.96% product purity. An industrial distiller design can help to estimate capital costs. New modeling work describes temperature and pressure change in the vapor conduit, energy use and losses in the industrial distiller, and effects of evaporator flow vanes on the separation of volatile elements such as zinc. © The Minerals, Metals & materials Society 2025.

关键词： Magnesium alloys

来源：评论

学校读者我要写书评

暂无评论

Planar structure of organic photodetector for low dark current

引用

Chinese Physics B 2025年第2期34卷 290-295页

作者： Mohammad Nofil Amirul Ashraf Md Sabri Fadlan Arif Natashah Tahani M Bawazeer Mohammad S Alsoufi Nur Adilah Roslan Azzuliani Supangat Low Dimensional Materials Research Centre Department of PhysicsFaculty of ScienceUniversiti MalayaKuala Lumpur50603Malaysia Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMakkahSaudi Arabia Mechanical Engineering Department College of Engineering and Islamic ArchitectureUmm Al-Qura UniversityMakkahSaudi Arabia Department of Physics Faculty of ScienceUniversiti Putra MalaysiaSerdang43400Malaysia

The focus of this study is on investigating the vanadyl 2,9,16,23-tetraphenoxy-29H, 31H-phthalocyanine(VOPc Ph O)and its blend with o-xylenyl C60 bis-adduct(OXCBA), for use as a lateral ultraviolet organic photodetector. The research focuses on improving dark current reduction, which is a challenge in lateral organic photodetector. By integrating the OXCBA, low dark current values of 4.83 nA·cm^(-2)(D_(shot)^(*)= 1.414 × 10^(11)Jones) have been achieved as compared to the stand-alone VoPcPhO device of 14.06 nA·cm^(-2). The major contributing factors to dark current reduction are due to the efficient charge transfer at the photoactive-electrode interface, the deep highest occupied molecular orbital(HOMO)level of OXCBA, which leads to favorable energy level alignments hindering hole injection, and the occurrence of bulk heterojunction vertical phase segregation between VOPcPhO and OXCBA. These findings shed light on the relationship between the organic photoconductor's material composition, morphology, and performance metrics and open new avenues for metal phthalocyanine-based lateral ultraviolet organic photodetectors with low dark current and enhanced performance.

关键词： small molecule dark current ultra-violet(UV)sensor device physics

来源：评论

学校读者我要写书评

暂无评论

Boosting bulk photovoltaic effect in transition metal dichalcogenide by edge semimetal contact

引用

Light(science & Applications) 2025年第1期14卷 197-205页

作者： Shuang Qiao Jihong Liu Chengdong Yao Ni Yang Fangyuan Zheng Wanqing Meng Yi Wan Philip C.Y.Chow Dong-Keun Ki Lijie Zhang Yumeng Shi Lain-Jong Li Hebei Key Laboratory of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei University071002BaodingChina Department of Mechanical Engineering The University of Hong KongHong KongChina Department of Physics and HK Institute of Quantum Science&Technology The University of Hong KongHong KongChina Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhouChina Key Laboratory of Luminescence and Optical Information Ministry of EducationSchool of Physical Science and EngineeringBeijing Jiaotong University100044BeijingChina

Oxide materials with a non-centrosymmetric structure exhibit bulk photovoltaic effect(BPVE)but with a low cell *** the past few years,relatively larger BPVE coefficients have been reported for two-dimensional(2D)layers and stacks with asymmety-induced spontaneous ***,we report a crucial breakthrough in boosting the BPVE in 3R-MoS2 by adopting edge contact(EC)geometry using bismuth semimetal *** clear contrast to the typically used top contact(TC)geometry,the EC metal which strongly adheres to the edges and the subtrates can induce a pronounced tensile strain to the 3R-MoS2,and the lateral contact geometry allows to completely access to in-plane polarization from underneath layers reachable by light,leading to>100 times of BPVE enhancement in *** further design a 3R-MoS2/WSe2 heterojunction to demonstrate constructive coupling of BPVE with the conventional photovoltaic effect,indicating their potential in photodetectors and photovoltaic devices.

关键词： effect geometry breakthrough

来源：评论

学校读者我要写书评

暂无评论

Mesoporous WO3-Dot-Decorated Flexible Electrodes for the Determination of Industrial Pollutants

引用

Energy & Environmental materials 2025年第2期8卷 277-287页

作者： Aneesh Koyappayil Hyunho Seok Gwan Hyun Choi Sachin Chavan Sangho Yeon Sihoon Son Anna Go Jinhyoung Lee Keon-Woo Kim Dongho Lee Hyun-Bin Choi Hyeong-U Kim Jin Kon Kim Taesung Kim Min-Ho Lee School of Integrative Engineering Chung-Ang University SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Materials Architecturing Research Center Korea Institute of Science and Technology (KIST) School of Mechanical Engineering Sungkyunkwan University National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer Pohang University of Science and Technology (POSTECH) Department of Semiconductor Convergence Engineering Sungkyunkwan University Semicondcutor Manufacturing Research Center Korea Institute of Machinery and Materials (KIMM) Department of Nano-Mechatronics University of Science and Technology (UST)

This study demonstrates the fabrication of mesoporous tungsten trioxide（WO3）-decorated flexible polyimide（PI） electrodes for the highly sensitive detection of catechol（CC） and hydroquinone（HQ）,two environmental ***-inorganic composite dots are formed on flexible PI electrodes using evaporation-induced self-assembly（EISA） and electrospray *** EISA process is induced by a temperature gradient during electrospray,and the heated substrate partially decomposes the organic parts etched by O2plasma,creating mesoporous *** pulse voltammetry and cyclic voltammetry demonstrate a linear correlation between analyte concentration and the electrochemical *** studies support the spontaneous adsorption of CC and HQ molecules on model *** proposed sensor shows high sensitivity,a wide linear range,and a low detection limit for both individual and simultaneous determination of CC and *** sample analysis on river water confirms practical *** WO3-decorated PI electrode presents an efficient and reliable approach for detecting these pollutants,contributing to environmental safety measures.

关键词： catechol flexible sensor hydroquinone mesoporous WO3 simultaneous determination

来源：评论

学校读者我要写书评

暂无评论

Design of A Novel Statically Balanced Mechanism for End-effector-type Upper Limb Assistance

Design of A Novel Statically Balanced Mechanism for End-effe...

引用

2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Meng, Qizhi Jiang, Ming Tang, Ruijie Kuo, Chin-Hsing Ceccarelli, Marco Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan Tsinghua University Department of Mechanical Engineering Beijing China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Partial loss of upper limb motor function is a typical sequela of stroke. To help such patients actively cope with daily challenges and improve their quality of life, limb functional assistances play important roles. To this end, this paper proposes a three-degree-of-freedom parallel mechanism, which can be used for human upper limb assistance. The base of the proposed mechanism is a circular track that can be attached to the waist of the human body. The mechanism consists of two chains containing parallelogram linkage, which presents good constraints for the mobile platform and facilitates the static balance design by adding springs, thereby providing reliable assistive functions and lightweight portability. The mobility of the proposed mechanism is analyzed via the screw theory, and it is verified that the mechanism generates the aimed movements. Then, the kinematic analysis of the mechanism is presented. Finally, the static balance design is carried out in detail, and the spring constants of the three added springs are calculated. The result shows that the mechanism can achieve perfect static balance. The proposed mechanism is expected to provide a potential candidate for assistive devices and be developed into a prototype providing upper limb assistance. © 2025 IEEE.

关键词： End effectors

来源：评论

学校读者我要写书评

暂无评论

Analysis of void formation and crack propagation at grain boundaries in Al-Zn-Mg-Cu alloy

引用

Keikinzoku/Journal of Japan Institute of Light Metals 2025年第2期75卷 96-102页

作者： Tsuchiya, Shota Shimizu, Kazuyuki Kamada, Yasuhiro Toda, Hiroyuki Fujihara, Hiro Hirayama, Kyosuke Koyama, Motomichi Uesugi, Masayuki Takeuchi, Akihisa Faculty of Science and Engineering Iwate University 4-3-5 Ueda Iwate Morioka-shi020-8551 Japan Faculty of Engineering Tottori University Tottori-shi Tottori Japan Department of Physical Science and Materials Engineering Iwate University Iwate Morioka-shi Japan Department of Mechanical Engineering Kyusyu University Fukuoka-shi Fukuoka Japan Department of Materials Science and Engineering Kyoto University Kyoto-shi Kyoto Japan Institute for Materials Research Tohoku University Sendai-shi Miyagi Japan Japan Synchrotron Radiation Research Institute Sayo-gun Hyogo Japan

Hydrogen embrittlement in Al-Zn-Mg-Cu alloys is suggested to originate from debonding of the η phase interface. Previous studies have shown that intragranular T phase precipitation, facilitated by increased Mg content, contributes to the mitigation of quasi-cleavage fracture. However, the role of T phase precipitation on the grain boundary in suppressing intergranular fracture remains unclear. In this study, in-situ observational techniques were used to examine the relationship between grain boundary precipitates and hydrogen-induce intergranular cracking. Obtained results showed that while the T phase precipitates in the matrix of Mg-enhanced alloy, the η phase predominates on grain boundaries, which lead intergranular fracture. The presence of numerous voids at intergranular crack tips suggests that void nucleation along grain boundaries and subsequent coalescence is the primary mechanism of crack propagation. The observed void formation at η phase interfaces is consistent with first-principles calculations and supports the concept that intergranular fracture originates from debonding at η phase interfaces. © 2025 The Japan Institute of Light Metals.

关键词： Grain boundaries

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：