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Effect of piston and cylinder head swirl generation techniques on the performance of ceiba pentandra and nigella sativa B20 biodiesel blended diesel engine operation

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materials Today: Proceedings 2022年 59卷 413-420页

作者： Pradeep, S.G. Banapurmath, N.R. Basavarajappa, Y.H. Yaliwal, V.S. Harari, P.A. Nataraja, K.M. Department of Mechanical Engineering KLE Institute of Technology Karnataka Hubballi India Centre for Material Science School of Mechanical Engineering KLE Technological University Hubballi India Department of Mechanical Engineering PES Institute of Technology and Management Karnataka Shivamogga India Department of Mechanical Engineering SDM College of Engineering and Technology Karnataka Dharwad India Department of Mechanical Engineering School of Engineering and Technology CMR University Karnataka Bengaluru India Department of Mechanical Engineering R.V. Institute of Technology and Management Karnataka Bengaluru India

Biodiesels are renewable fuels and their usage in diesel engine can decrease the dependence on fossil-based fuels which are exhaustive in nature. Further they can effectively address the alarming increase in emission levels in the atmosphere and provide savings in the foreign exchange. The present work mainly focuses on the effect of swirl techniques adopted on the performance of the modified diesel engine powered with two B20 based biodiesels derived from Ceiba Pentandra (CPNTOME B20) and Nigella Sativa (NIZSAOME B20) respectively. The swirl techniques are adopted by suitable modifications on both the piston and cylinder head surfaces respectively. Optimized number of cavities on piston and cavities and domes on the cylinder head improved the diesel engine performance powered with selected biodiesel blended fuels. Accordingly, 6 number of cavities on the piston and 2 domes and 3 cavities on the cylinder head surfaces provided higher brake thermal break efficiency (BTE), lower hydrocarbons (HC), carbon monoxide (CO), smoke emissions while nitric oxide (NOx) emissions were increased for the diesel engine powered with two B20 blends compared to other swirl combinations used. Among the two biodiesels used CPNTOME B20 showed higher engine performance compared to NIZSAOME B20. BTE of engine fuelled with diesel increased by 4.86% and 6.54% respectively when compared with B20 blends of CPNTOME and NIZSAOME. Smoke emissions of engine fuelled with diesel decreased by 8.27% and 11.43% respectively when compared with B20 blends of CPNTOME and NIZSAOME. © 2021

关键词： Diesel engines

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Investigation on Spark Plasma Sintering of Calcareous Waste Concrete Powder and Coal Fly Ash

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2023年第11期70卷 451-460页

作者： Kanda, Yasuyuki Shinjo, Tomohide Mechanical Engineering Program School of Engineering Faculty of Engineering University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan Solid Mechanics and Materials Engineering Graduate School of Engineering and Science University of the Ryukyus 1 Senbaru Nishihara-cho Okinawa Nakagami-gun903-0213 Japan

This paper aims to fabricate a composite material using calcareous waste concrete powder and coal fly ash (FA) by spark plasma sintering. The effect of FA addition on the mechanical properties of the composite material were investigated. The maximum FA content was 7.5 wt%. The relative density of the composite material was approximately 1.0, independent of FA content. In contrast, the Vickers hardness, flexural strength, and flexural modulus increased with increasing FA content. However, the dispersion state of FA in the composite material was not observed by scanning electron microscopy. Powder X-ray diffraction of the composite material revealed that spurrite and wollastonite were formed identically, independent of FA content. Therefore, FA serves as a reinforcement in the composite material. © 2023 Japan Society of Powder and Powder Metallurgy.

关键词： Spark plasma sintering

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Inhibiting scar formation via wearable multilayer stacked electret patch:Self-creation of persistent and customizable DC electric field for fibrogenic activity restriction

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InfoMat 2024年第3期6卷 66-80页

作者： Sung-Won Kim Sumin Cho Donghan Lee Jiyu Hyun Sunmin Jang Inwoo Seo Hyun Su Park Hee Jae Hwang Hyung-Seop Han Dae Hyeok Yang Heung Jae Chun Suk Ho Bhang Dongwhi Choi School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Department of Mechanical Engineering(Integrated Engineering Program) Kyung Hee UniversityYonginGyeonggiRepublic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Department of Medical Life Sciences College of MedicineInstitute of Cell and Tissue EngineeringThe Catholic University of KoreaSeoulRepublic of Korea

Electrical stimulation has recently received attention as noninvasive treatment in skin wound healing with its outstanding biological property for clinical ***,the complexity of equipment for applying appropriate electrical stimulation remains an ongoing ***,we proposed a strategy for skin scar inhibition by providing electrical stimulation via a multilayer stacked electret(MS-electret),which can generate direct current(DC)electric field(EF)without any power supply *** addition,the MS-electret can easily control the intensity of EFs by simply stacking electret layers and maintain stable EF with the surface potential of 3400 V over 5 days owing to the injected charges on the electret *** confirmed inhibition of type 1 collagen andα-SMA expression of human dermal fibroblasts(hDFs)by 90%and 44%in vitro,indicating that the transition of hDFs to myofibroblasts was restricted by applying stable electrical *** further revealed a 20%significant decrease in the ratio of myofibroblasts caused by the MS-electret in *** findings present that the MS-electret is an outstanding candidate for effective skin scar inhibition with a battery-free,physiological electrical microenvironment,and noninvasive treatment that allows it to prevent external infection.

关键词： DC electric field dermal fibroblasts electret scar formation restriction self-creation of electrical stimulation

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Significantly enhanced performance and conductivity mechanism in Nb/Mn co-doped CaBi_(4)Ti_(4)O_(15)ferroelectrics

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Journal of Materiomics 2024年第3期10卷 652-669页

作者： Jiageng Xu Shaoxiong Xie Qian Xu Jie Xing Qingyuan Wang Jianguo Zhu School of Aeronautics and Astronautics Sichuan UniversityChengdu610000China Institute for Advanced Study Chengdu UniversityChengdu610106China Department of Mechanical Engineering Kyushu UniversityFukuoka819-0395Japan College of Architecture and Environment Sichuan UniversityChengdu610065China College of Material Science and Engineering Sichuan UniversityChengdu610065China

With the rapid development of high-end industries,the demand for high-temperature piezoelectric materials is significantly ***,realizing the ultra-high performance to meet more ap-plications still faces major scientific and engineering challenges of our ***,a new Nb/Mn co-doped CaBi_(4)Ti_(4)O_(15)(CBT)high-temperature piezoelectric material system of CaBi_(4)Ti_(4-x)(Nb_(2/3)Mn_(1/3))_(x)O_(15)was synthesized by the conventional solid-state sintering *** results show that the addition of the dopants tends to break the long-range ferroelectric chain and soften the flexibility of polarization,resulting in more distorted crystal structure and better ferroelectric properties of CBT *** ultra-high piezoelectric constant(d_(33)=26.8 pC/N)is thus attained in CBT-based ceramics with x=0.12,which is about several times larger than that of pure CBT ***,numerous nano-sized layered domain structures that lie on the lateral plane of grains are observed in ceramics,with lower domain wall energy and better dynamic features under electric fields,mainly responsible for the origin of enhanced ***,excess dopants could make the conductivity mechanism of CBT ceramics transform from p-type to n-type,and also result in a shift of conduction relaxation mechanism from defect dipole rotation polarization to electron relaxation *** work not only provides a promising candidate for high-temperature piezoelectric materials,but also opens a window for opti-mizing performance by tailoring domain structures using chemical modification.

关键词： CaBi_(4)Ti_(4)O_(15) Lattice distortion Electrical performance Domain structure Conductivity mechanism

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Metal-organic frameworks (MOFs) in aqueous batteries (ABs):unlocking potential through innovative materials design

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science China Chemistry 2025年

作者： Bo Han Erhai Hu Bei-Er Jia Ziyang Liu Shuen Tso Afriyanti Sumboja Ivandini T.Anggraningrum Anne Zulfia Syahrial Qingyu Yan SCARCE Laboratory Energy Research Institute NTU (ERIN) Nanyang Technological University School of Materials Science and Engineering Nanyang Technological University Material Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Department of Chemistry University of Indonesia Metallurgical & Materials Engineering Department Fakultas Teknik Universitas Indonesia

Metal-organic frameworks (MOFs) represent a revolutionary class of materials in the field of energy storage,particularly for aqueous batteries (ABs).Distinguished by their large surface area,tuneable porosity,and adaptable chemical activity,MOFs offer significant advantages over conventional materials in battery *** article provides a thorough analysis of the crucial role that MOFs play in improving the efficiency of *** includes a concise review of the current research progress,emphasizing the fundamental processes by which MOFs enhance electrochemical ***,the review examines the synthesis and design strategies for the structure of MOFs to maximize ion transport,improve conductivity,and enhance *** structural advantages,chemical versatility,stability,durability and functionalization potential of MOFs are comprehensively ***,we explore the distinct advantages of MOFs in overcoming common challenges encountered in ABs,such as declining capacity,inadequate cycling stability,and limited energy *** paper also highlights the future research directions needed to fully harness their *** goal is to develop a fundamental understanding and stimulate further progress in the use of MOFs for advanced energy storage solutions.

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Simultaneous Solar-driven Steam and Electricity Generation by Cost-effective,Easy Scale-up MnO 2-based Flexible Membranes

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Energy & Environmental materials 2023年第3期6卷 184-192页

作者： Jiaxin Ren Yang Ding Jiang Gong Jinping Qu Ran Niu Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureHubei Engineering Research Center for Biomaterials and Medical Protective MaterialsSemiconductor Chemistry CenterSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing EngineeringMinistry of EducationGuangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced ManufacturingSchool of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou 510641China

Harvesting solar energy in an effective manner for steam and electricity generation is a promising technique to simultaneously cope with the energy and water ***,the construction of efficient and easy scale-up photothermal materials for steam and electricity cogeneration remains ***,we report a facile and cost-effective strategy to prepare MnO_(2)-decorated cotton cloth(MCx).The wide adsorption spectrum and excellent photothermal conversion ability of the in situ-formed MnO_(2)nanoparticles make the MCx to be advanced photothermal ***,the hybrid device integrated with MCx as the photothermal layer and the thermoelectric(TE)module for electricity power conversion exhibits an extremely high evaporation rate of 2.24 kg m^(−2)h^(−1)under 1 kW m^(−2)irradiation,which is ranked among the most powerful solar *** importantly,during solar evaporation,the hybrid device produces an open-circuit voltage of 0.3 V and a power output of 1.6 W m^(−2)under 3 Sun irradiation,and outperforms most of the previously reported solar-driven electricity generation ***,the integrated device with synergistic solar-thermal utilization opens up a green way toward simultaneous solar vapor and electric power generation in remote and resource-constrained areas.

关键词： photothermal material solar desalination solar energy solar steam generator thermoelectrics

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Effect of infill pattern on fatigue characteristics of 3D printed polymers

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materials Today: Proceedings 2023年 78卷 263-269页

作者： Dudescu, Mircea Cristian Racz, Laszlo Popa, Florin Department of Mechanical Engineering Technical University of Cluj-Napoca 103-105 Muncii Boulevard Cluj-Napoca 400641 Romania Department of Material Science and Engineering Technical University of Cluj-Napoca 103-105 Muncii Boulevard Cluj-Napoca 400641 Romania

The effect of the structure that is printed inside an object, known as infill pattern, on fatigue life of 3D printed specimens made of ABS was investigated in this paper. There are several infill pattern geometries, each with benefits and compromises between material usage, printing time or mechanical strength of the obtained part. Standard specimens with 100 % infill rate and rectilinear 0° and 90°, grid 0°–90° and ± 45°, triangular 60°, fast honeycomb, full honeycomb and wiggle infill patterns were tested. Following the completion of tensile tests to determine the ultimate tensile strength (UTS) of specimens, axial fatigue tests for each combination of infill pattern were conducted to measure the fatigue life for 90 %, 75 %, 60 %, 45 % and 40 % UTS. Comparative evaluation of the measured values revealed the strong influence of the printing patterns upon fatigue life. A simple mathematical model of the fatigue proprieties has been proposed for each infill patterns, statistical data shows that the proposed model ensures reasonably accurate prediction of fatigue life. The examination of fracture areas using electronic microscopy indicated the microstructural interaction between filaments underlying the main failure mechanisms, crazing, delamination and disbonding of the filaments and layers and their fracture. The results indicate that pattern with inclined filaments about tensile axis (grid±45°, rectilinear 0° and triangular 60°) have the maximum fatigue life compared with those with most of the filaments perpendicular to tensile direction (fast honeycomb, full honeycomb and rectilinear 90°). The pattern like grid 0°–90° and wiggle are very close to the first group, having filaments inclined (wiggle) or along and perpendicular to the tensile direction (grid 0°–90°). © 2022

关键词： Tensile strength

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Effect of Sintering Temperature on Adhesion Strength of Hydroxyapatite Coating Layer of Titanium TNTZ Prepared by Dip Coating Method 4

Effect of Sintering Temperature on Adhesion Strength of Hydr...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Gunawarman Affi, Jon Zaky, Fakhar Chandra, Devi Niinomi, Mitsuo Akahori, Toshikazu Dept. of Mechanical Engineering Universitas Andalas Padang25163 Indonesia Institute for Materials Research Tohoku University Sendai Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Japan Dept. of Material Science and Engineering Graduate School of Science and Technology Meijo University Nagoya Japan

This study investigates the effect of sintering temperatures on the adhesion strength of hydroxyapatite (HA)-coated Ti–29Nb–13Ta-4.6Zr (TNTZ) prepared using the dip coating method. TNTZ samples were coin-type specimens with a diameter of 15 mm and a thickness of 4 mm, and polished surfaces. The sol-gel, which is used to help the hydroxyapatite adhere to the metal surface of the material, was prepared by mixing KH2PO4 liquid, Ca(NO3)2 liquid, and NH4OH as a catalyst. The coating process uses the dip coating method with an immersion time of 30 seconds and a withdrawal speed of 4 mm/s. The sintering process was carried out at a temperature of 700 ?, 800 ?, and 900 ? for 1 hour, respectively. The surface morphologies were then examined using optical and scanning electron microscopes. Coating layer thickness, covered surface, and addition strength were then measured by using related equipment. The results show that the measured surface properties depend significantly on the sintering temperatures. The additional strength decreases with increasing temperature although layer thickness increases. The higher sintering temperatures seem to lead to more cracks and detachment of the hydroxyapatite layer, reducing the covered surface area and adhesion strength. The low sintering temperature of 700? achieves better coating characteristics and adhesion strength of titanium TNTZ. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Sintering

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A Novel Movement Behavior Control Method for Carp Robot through the Stimulation of Medial Longitudinal Fasciculus Nucleus of Midbrain

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Journal of Bionic engineering 2022年第5期19卷 1302-1313页

作者： Yang Zhao Yong Peng Yudong Wen Lingjun Han Hui Zhang Zheng Zhao Xiaoyue Liu School of Electrical Engineering Yanshan UniversityQinhuangdao 066004China Key Laboratory of National Defense of Mechanical Structure and Material Science Under Extreme Conditions Yanshan UniversityQinhuangdao 066004China Institute of Marine Science and Engineering Yanshan UniversityQinhuangdao 066004China

Biological robot is a kind of creature controlled by human beings by applying intervention signals through control technology to regulate biological *** present,the research on bio-robot mainly focuses on terrestrial mammals and insects,while the research on aquatic animal robot is *** studies have shown that the medial longitudinal fasciculus nucleus(NFLM)of carp midbrain was related to tail wagging,but the research has not been applied to the navigation control of the carp *** purpose of this study is to realize the quantitative control of the forward and steering behavior of the carp robot by NFLM electrical *** the condition of no craniotomy,brain electrode was implanted into the NFLM of the carp midbrain,and the underwater control experiment was carried out by applying different electrical stimulation *** the ImageJ software and self-programmed,the forward motion speed and steering angle of steering motion of the carp robot before and after being stimulated were *** experimental results showed for the carp robot that was induced the steering motion,the left and right steering motion of 30°to 150°could be achieved by adjusting the stimulation parameters,for the carp robot that was induced the forward motion,the speed of forward motion could be controlled to reach 100 cm/*** research lays a foundation for the accurate control of the forward and steering motion of the aquatic animal robot.

关键词： Carp robot Midbrain Medial longitudinal fasciculus nucleus Electrical stimulation Steering motion control Forward motion control

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

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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

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