Materials Engineering eJournal最新文献_第7页

Current Density Regulating Lithium Metal Directional Deposition for Long Cycle Life Lithium Metal Batteries 长循环寿命锂金属电池的电流密度调节定向沉积

Materials Engineering eJournal Pub Date : 2020-12-19 DOI: 10.2139/ssrn.3751761

Heng Mao, Wei Yu, Zhuanyun Cai, Guixian Liu, Limin Liu, R. Wen, Yaqiong Su, Kai Xi, Benqiang Li, Xinyu Da, H. Kou, Wei Yan, Shujiang Ding

{"title":"Current Density Regulating Lithium Metal Directional Deposition for Long Cycle Life Lithium Metal Batteries","authors":"Heng Mao, Wei Yu, Zhuanyun Cai, Guixian Liu, Limin Liu, R. Wen, Yaqiong Su, Kai Xi, Benqiang Li, Xinyu Da, H. Kou, Wei Yan, Shujiang Ding","doi":"10.2139/ssrn.3751761","DOIUrl":"https://doi.org/10.2139/ssrn.3751761","url":null,"abstract":"Uncontrolled dendrite formation in the high energy density of lithium metal batteries (LMBs) may pose serious safety risks. Numerous works have been reported to protect separator. However, these methods still couldn’t inhibit the dendrite upward growth to protect the separator, effectively. Here, we introduce a novel “orientated-growth” strategy that makes the depositional interface transfer to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (CCA-Li). This layer works as the charge organizer; it induces a higher current density distribution and makes Li prefer to deposit in the bottom CCA layer of CCA-Li electrode. Both in-situ and ex-situ images of the electrode demonstrate the anode part of the cell has been flipped; with the new deposited particles facing the current collector and smooth surface facing the separator. Electrochemical characterization of the electrode in half and full cells showed outstanding cyclic stability and rate capability, with the CCA-Li/LPF full cell able to maintain 94% of its initial capacity after 1000 cycles. We believe that the innovative strategy would promote the leapfrog development for LMBs.","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"146 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88644661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-Cleaning and Self-Cooling Cellulose-Fiber-Based Hierarchical Composites 自清洁和自冷却纤维素-纤维基分层复合材料

Materials Engineering eJournal Pub Date : 2020-12-14 DOI: 10.2139/ssrn.3748560

Yanpei Tian, Hong Shao, Xiaojie Liu, Fangqi Chen, Yongsheng Li, Changyu Tang, Y. Zheng

{"title":"Self-Cleaning and Self-Cooling Cellulose-Fiber-Based Hierarchical Composites","authors":"Yanpei Tian, Hong Shao, Xiaojie Liu, Fangqi Chen, Yongsheng Li, Changyu Tang, Y. Zheng","doi":"10.2139/ssrn.3748560","DOIUrl":"https://doi.org/10.2139/ssrn.3748560","url":null,"abstract":"Passive daytime radiative cooling (PDRC) cools an object down by simultaneously reflecting sunlight and thermally radiating heat to the cold outer space through the Earth's atmospheric window. However, for practical applications, current PDRC materials are facing unprecedented challenges such as complicated and expensive fabrication approaches and performance degradation arising from surface contamination. Here, we develop scalable cellulose-fiber-based hierarchical composites with excellent self-cleaning and self-cooling capabilities, through air-spraying ethanolic polytetrafluoroethylene (PTFE) microparticles suspensions embedded within the micropores of the cellulose fiber. The formed superhydrophobic PTFE coating not only protects the cellulose-fiber-based paper from water wetting and dust contamination for real-life applications but also reinforces its solar reflectance by sunlight backscattering. It results in a sub-ambient cooling performance of 5°C and radiative cooling power of 104 W/m2 under direct solar irradiance of 834 W/m2 and 671 W/m2, respectively. The self-cleaning surface of the hierarchical composites extends its lifespan and keep its good cooling performance for outdoor applications. Additionally, dyed cellulose-fiber-based paper can absorb appropriate visible wavelengths to display specific colors and effectively reflect near-infrared lights to reduce solar heating, which synchronously achieves effective radiative cooling and aesthetic varieties.","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"12 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80404188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of Technological Restrictions When Operating Disc Polymer-Abrasive Brushes 盘式聚合物磨料刷操作技术限制的发展

Materials Engineering eJournal Pub Date : 2020-12-11 DOI: 10.15587/1729-4061.2020.212820

P. Tryshyn, N. Honchar, Eduard Kondratiuk, D. Stepanov

{"title":"Development of Technological Restrictions When Operating Disc Polymer-Abrasive Brushes","authors":"P. Tryshyn, N. Honchar, Eduard Kondratiuk, D. Stepanov","doi":"10.15587/1729-4061.2020.212820","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.212820","url":null,"abstract":"Polymer-abrasive brush rotating tools are increasingly used for finishing operations in automated manufacturing. Given this, studying the process of their fibers’ wear has become important; and such a type of wear as the detachment of a whole fiber at the point of fixing has not been investigated in detail up to now. This phenomenon can lead to the disruption of stable equipment operation and the catastrophic wear of brushes. Therefore, it is a relevant task to search for and identify those limitations that could prevent fibers from detachment. This study involved the disc and cylindrical polymer-abrasive brushes as the most common in production. The current study has established that the detachment occurs at an unfavorable combination of the processing regimes and brushes’ parameters at rotations close to the limits specified by the manufacturer. When checking the temperature level at the fiber anchoring point, it was determined that the heating of the fibers in this region during operation was not enough to melt the polymeric base of the fibers and detach them. It has been established that the reason for the detachment of fibers is the accumulation of fatigue changes, which significantly accelerate under the limit modes. Studying the cyclical durability of fibers has made it possible to determine the ratios of critical processing modes to the tool parameters, which lead to the fatigue destruction of fibers at their fixing point. The following technological restrictions have been defined to warrant that fibers are not detached: ‒ it is not recommended to use circumferential cutting speeds exceeding 40 m/s; ‒ the tension during operation should not exceed 10 % of the fibers’ overhang magnitude. These limitations ensure the integrity of the tool, its high durability, as well as the stability of the process of parts’ finishing machining under an automated mode","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79095809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Giant Heterogeneous Magnetostriction Induced by Charge Accumulation-Mediated Nanoinclusion Formation in Dual-Phase Nanostructured Systems 电荷积累介导的双相纳米结构体系中纳米包裹体形成诱导的巨非均相磁致伸缩

Materials Engineering eJournal Pub Date : 2020-12-04 DOI: 10.2139/ssrn.3742924

Yijun Chen, Z. Fu, Yuye Wu, Yichen Xu, Yu Xiao, Jingmin Wang, Ruifeng Zhang, Chengbao Jiang

{"title":"Giant Heterogeneous Magnetostriction Induced by Charge Accumulation-Mediated Nanoinclusion Formation in Dual-Phase Nanostructured Systems","authors":"Yijun Chen, Z. Fu, Yuye Wu, Yichen Xu, Yu Xiao, Jingmin Wang, Ruifeng Zhang, Chengbao Jiang","doi":"10.2139/ssrn.3742924","DOIUrl":"https://doi.org/10.2139/ssrn.3742924","url":null,"abstract":"The fundamental origin of the giant magnetostriction in the dual-phase nanostructured systems is under energetic discussion in recent years. Previous studies have revealed that the formation of tetragonal nanoinclusions induced the enlargement in local magnetocrystalline anisotropy, leading to a strengthened magneto-elastic coupling coefficient, which was considered to promote magnetostriction. As the other key factor of magnetostriction, the influence of the nanoinclusions on the elastic constants of the lattices is still unnoticeably. In this work, we propose a mechanism based on the experimental and theoretical results of binary and rare-earth (RE) doped FeGa single-crystals. Doping traces of RE atoms effectively increase the density of nanoinclusions in the A2 matrix, because of the high selectivity of RE atoms so that they possess stronger bonding interaction with Fe atoms rather than Ga atoms. As a sequence, the elastic constant ς 12 significantly increases with the rising density of tetragonal nanoinclusions as opposed to a constant ς 11, resulting in a remarkable enhancement in magnetostriction due to the inversely proportional relationship between magnetostriction (λ 001) and ς 11 - ς 11. A superior magnetostriction of 390 ppm is obtained in the RE-doped single-crystal due to the lattice softening induced by the nanoinclusions. This model sheds light into the contribution of RE atoms to magnetostriction in FeGa single-crystals, and establishes a foundation for developing new-generation dual-phase magnetostrictive materials to achieve unprecedented levels of magnetostriction.","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77582078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Heterogeneous Lamella Design to Tune the Mechanical Behaviour of a New Cost-Effective Compositionally Complicated Alloy 非均相片层设计以调整一种新型高效复合合金的力学行为

Materials Engineering eJournal Pub Date : 2020-12-01 DOI: 10.2139/ssrn.3751555

Yu Yin, Qiyang Tan, Qiang Sun, W. Ren, Jingqi Zhang, Shiyang Liu, Yingang Liu, M. Bermingham, Houwen Chen, Mingxing Zhang

{"title":"Heterogeneous Lamella Design to Tune the Mechanical Behaviour of a New Cost-Effective Compositionally Complicated Alloy","authors":"Yu Yin, Qiyang Tan, Qiang Sun, W. Ren, Jingqi Zhang, Shiyang Liu, Yingang Liu, M. Bermingham, Houwen Chen, Mingxing Zhang","doi":"10.2139/ssrn.3751555","DOIUrl":"https://doi.org/10.2139/ssrn.3751555","url":null,"abstract":"A novel heterogeneous lamella (HL) design strategy was proposed to improve mechanical properties of a new cost-effective Fe 35 Ni 35 Cr 25 Mo 5 compositionally complicated alloy (CCA). A HL structure was produced by single-step heat treatment (800 °C for 1h) after cold rolling. This HL structure consists of alternative lamellae regions of coarse-grained FCC matrix (5∼20 μm), and regions containing ultra-fine grains or subgrains (200∼500 nm) together with nanoprecipitates (20-500 nm) and annealing twins. The 800 °C annealed sample with HL structure demonstrated a superior tensile property, with yield strength over 1.0 GPa and ductility of ~13%. Formation of the annealing twins and nanoprecipitates decorated HL structure was a result of the concurrent partial recrystallization and precipitation of σ phase at the shear bands with a high density of lattice defects (e.g. high-density dislocation walls and deformation twins). The latter restricted the growth of recrystallized grains, leading to the formation of ultrafine subgrains within the HL structure. The high yield strength resulted from the multistage hetero-deformation induced (HDI) strengthening and precipitation strengthening associated with heterogeneous lamella structures containing nanoprecipitates. The ductility was originated from the coexistence of multiple deformation mechanisms, which started with dislocation slip and formation of stacking faults at the initial stage, followed by nano-twinning at the higher strain level. This HL design strategy, comprising of composition and thermomechanical process designs, and the resultant microstructure tuning, open a broader window for development of cost-effective CCAs with enhanced performance.","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83036114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Precise Measurement of Activation Parameters for Individual Dislocation Nucleation During in Situ Tem Tensile Testing of Single Crystal Nickel 镍单晶原位拉伸试验中单个位错成核激活参数的精确测量

Materials Engineering eJournal Pub Date : 2020-11-25 DOI: 10.2139/ssrn.3737304

Xiaoqing Li, A. Minor

引用次数: 6

Using Entropy Weight and Over All Evaluation Criteria Optimize the Parameters in EDM of Al–20 Wt. % SICP MMC 利用熵权和总体评价标准对al - 20wt . % SICP MMC电火花加工工艺参数进行优化

Materials Engineering eJournal Pub Date : 2020-11-23 DOI: 10.2139/ssrn.3735855

R. Bhuyan, A. Parida, P. Behera

引用次数: 2

Children Longitudinal Face Recognition Using Random Forest 使用随机森林的儿童纵向人脸识别

Materials Engineering eJournal Pub Date : 2020-11-23 DOI: 10.2139/ssrn.3735819

S. R., D. S. Guru, Manjunath Aradhya, Anitha Raghavendra

引用次数: 1

Implementing Trust Aware Routing Protocols for Privacy Preservation in MANET: Implementation & Synthesis 在MANET中实现信任感知路由协议的隐私保护:实现与综合

Materials Engineering eJournal Pub Date : 2020-11-23 DOI: 10.2139/ssrn.3735719

Shubham Joshi, D. Mishra

引用次数: 1

Optimization of CNN Model With Hyper Parameter Tuning for Enhancing Sturdiness in Classification of Histopathological Images 用超参数调整优化CNN模型增强组织病理图像分类的稳健性

Materials Engineering eJournal Pub Date : 2020-11-23 DOI: 10.2139/ssrn.3735831

Anil Johny, Dr. Madhusoodanan K. N., Dr. Tom J Nallikuzhy

{"title":"Optimization of CNN Model With Hyper Parameter Tuning for Enhancing Sturdiness in Classification of Histopathological Images","authors":"Anil Johny, Dr. Madhusoodanan K. N., Dr. Tom J Nallikuzhy","doi":"10.2139/ssrn.3735831","DOIUrl":"https://doi.org/10.2139/ssrn.3735831","url":null,"abstract":"The field of pathology has advanced so rapidly that it is now possible to produce whole slide images (WSI) from glass slides with digital scanners producing high-quality images. Image analysis algorithms applied to such digitized images facilitate automatic diagnostic tasks whilst assisting a medical expert. Successful detection of malignancy in histopathological images largely depends on the expertise of radiologists, though they sometimes disagree with their decisions. Computer-aided diagnosis provides a platform for a second opinion in diagnosis, which can improve the reliability of an expert's opinion. Deep learning provides promising results compared to the conventional approach that relies on manual extraction of features which is time-consuming and labor-intense. Due to the huge size, whole slide images are converted into patches and trained using a Convolutional Neural Network (CNN), a variant of the deep learning model for images. Experimental results show that the proposed native model achieved patch wise classification accuracy of 92.8% and area under ROC curve 0.97 which is close to the values while comparing with the existing pre-trained models.","PeriodicalId":18268,"journal":{"name":"Materials Engineering eJournal","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80915793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3