检索结果-南通市图书馆

Journal of Magnesium and Alloys 2022年第9期10卷 2475-2490页

作者： Jong un Lee Sang-Hoon Kim Dong Hee Lee Hyun Ji Kim Young Min Kim Sung Hyuk Park School of Materials Science and engineering Kyungpook National UniversityDaegu 41566Republic of Korea Agency for Defense Development Daejeon 34186Republic of Korea Implementation Research Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study, the bending formability of an extruded Mg–9Al–1Zn–0.3Mn–0.9Ca–0.6Y–0.5 MM(AZXWMM91100, wt%) alloy at room temperature is significantly improved through application of a combined precompression and subsequent annealing(PCA) treatment. As the amount of precompression applied along the extrusion direction(eD)(i.e., the total strain) increases from 4% to 6%, the area fraction of eD-oriented grains of the PCA-treated alloy increases, which consequently causes an improvement in its bending formability because these grains accommodate larger tensile strain along the eD during bending. As the temperature of the subsequent annealing treatment increases from 350 ℃ to 450 ℃, both the area fraction of the eD-oriented grains and the average grain size increase, and the residual dislocation density decreases owing to the promotion of boundary migration and occurrence of the recovery process at higher ***, the bending formability of both the 4%-precompressed and the 6%-precompressed samples increases with an increase in the annealing temperature. However, when the precompressed samples are annealed at 300 ℃, their bending formability is lower than that of the extruded alloy because the dislocations formed by precompression remain even after the subsequent annealing at this temperature.

关键词： Magnesium extrusion Bending Formability Texture

Dynamic recrystallization behavior and microstructural evolution of Mg alloy AZ31 through high-speed rolling

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第10期34卷 1747-1755页

作者： Jeong Hun Lee Jong un Lee Sang-Hoon Kim Seok Weon Song Chong Soo Lee Sung Hyuk Park Ulsan Regional Division Korea Institute of Industrial Technology School of Materials Science and engineering Kyungpook National University Technical Research Laboratories POSCO Graduate Institute of Ferrous Technology Pohang University of Science and Technology

High-speed rolling （HSR） is known to improve the workability of Mg alloys significantly, which makes it possible to impose a large reduction in a single pass without fracture. In the present study, dynamic recrystallization （DRX） behavior and microstructural and textural variations of Mg alloy AZ31 dur-ing a HSR process were investigated by conducting rolling with different imposed reductions in the range of 20%-80% at a high rolling speed of 470 m/min and 400℃. High-strain-rate deformation during HSR suppresses dislocation slips but promotes twinning, which results in the formation of numer-ous twins of several types, i.e., {10-12} extension twins, {10-11} and {10-13} contraction twins, and {10-11}-{10-12} double twins. After twinning, high strain energy is accumulated in twin bands because their crystallographic orientations are favorable for basal slips, leading to subsequent DRX at the twin bands. Accordingly, twinning activation and twinning-induced DRX behavior play crucial roles in accommodating plastic deformation during HSR and in varying microstructure and texture of the high- speed-rolled （HSRed） sheets. Area fraction of fine DRXed grains formed at the twin bands increases with increasing rolling reduction, which is attributed to the combined effects of increased strain, strain rate, and deformation temperature and a decreased critical strain for DRX. Size, internal strain, and texture intensity of the DRXed grains are smaller than those of unDRXed grains. Therefore, as rolling reduction increases, average grain size, stored internal energy, microstructural inhomogeneity, and basal texture intensity of the HSRed sheets gradually decrease owing to an increase in the area fraction of the DRXed grains.

关键词： Magnesium alloy High-speed rolling Twinning Dynamic recrystallization Microstructure

Feature Fusion-Based Deep Learning Network to Recognize Table Tennis Actions

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第1期74卷 83-99页

作者： Chih-Ta Yen Tz-Yun Chen un-Hung Chen Guo-Chang WangZong-Xian Chen Department of electrical engineering Taiwan Ocean UniversityKeelung City202301Taiwanchina Office of Physical education National Formosa UniversityYunlin County632Taiwan Department of electrical engineering National Formosa UniversityYunlin County 632Taiwan

A system for classifying four basic table tennis strokes using wearable devices and deep learning networks is proposed in this *** wearable device consisted of a six-axis sensor,Raspberry Pi 3,and a power *** kernel sizes were used in convolutional neural network(CNN)to evaluate their performance for extracting ***,a multiscale CNN with two kernel sizes was used to perform feature fusion at different scales in a concatenated *** CNN achieved recognition of the four table tennis *** data were obtained from20 research participants who wore sensors on the back of their hands while performing the four table tennis strokes in a laboratory *** data were collected to verify the performance of the proposed models for wearable ***,the sensor and multi-scale CNN designed in this study achieved accuracy and F1 scores of 99.58%and 99.16%,respectively,for the four *** accuracy for five-fold cross validation was 99.87%.This result also shows that the multi-scale convolutional neural network has better robustness after fivefold cross validation.

关键词： Wearable devices deep learning six-axis sensor feature fusion multi-scale convolutional neural networks action recognit

A Compact Rhombus Shaped Antenna with extended Stubs for Ultra-Wideband Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第11期73卷 2637-2650页

作者： Syed Misbah un Noor Muhammad Amir Khan Shahid Khan NZ Jhanjhi Mamoona Humayun Hesham A.Alhumyan Department of electrical engineering IIC University of TechnologyPhnom PenhCambodia Department of Computer Science COMSATS University IslamabadAbbottabad Campus22060Pakistan Department of electrical and Computer engineering COMSATS University IslamabadAbbottabad Campus22060Pakistan School of Computer Science SCSTaylor’s UniversitySubang Jaya47500SelangorMalaysia 5Center for Smart Society 0 CSS5 Faculty of Innovation and TechnologyTaylor’s UniversitySubang Jaya47500Malaysia Department of Information Systems College of Computer and Information SciencesJouf UniversityAl-JoufKSA

Ultra-wideband(UWB)is highly preferred for short distance *** a result of this significance,this project targets the design of a compact UWB *** paper describes a printed UWB rhombusshaped antenna with a partial ground *** achieve wideband response,two stubs and a notch are incorporated at both sides of the rhombus design and ground plane *** excite the antenna,a simple microstrip feed line is *** suggested antenna is built on a 1.6 mm thick FR4 *** proposed design is very compact with overall electrical size of 0.18λ×0.25λ(14×18 mm2).The rhombus shaped antenna covers frequency ranging from 3.5 to 11 GHz with 7.5 GHz impedance *** proposed design simulated and measured bandwidths are 83.33%and 80%,*** pattern in terms of e-field and H-field are discussed at 4,5.5 and 10 GHz *** proposed design has 65%radiation efficiency and 1.5 dBi peak *** proposed design is simulated in CST(Computer Simulation Technology)simulator and the simulated design is fabricated for the measured *** simulated and measured findings are in close *** obtained results confirm the application of the proposed design for the ultra-wide band applications.

关键词： Ultra-wideband impedance bandwidth radiation pattern CST electrical size

Dynamic connectedness and network in the high moments of cryptocurrency,stock,and commodity markets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Financial Innovation 2023年第1期9卷 2388-2427页

作者： Waqas Hanif Hee‑un Ko Linh Pham Sang Hoon Kang CeFAGe‑Center for Advanced Studies in Management and economics University of AlgarveFaroPortugal Department of Management Sciences COMSATS University IslamabadAttock CampusAttockPakistan Korea Housing and Urban Guarantee Corporation BusanRepublic of Korea economics Business and Finance DepartmentLake Forest CollegeLake ForestIL 60045USA PNU Business School Pusan National UniversityJangjeon2‑DongGeumjeong‑GuBusan 609‑735Republic of Korea

This study examines the connectedness in high-order moments between cryptocurrency,major stock(U.S.,U.K.,eurozone,and Japan),and commodity(gold and oil)*** intraday data from 2020 to 2022 and the time and frequency connectedness models of Diebold and Yilmaz(Int J Forecast 28(1):57–66,2012)and Barunik and Křehlik(J Financ econom 16(2):271–296,2018),we investigate spillovers among the markets in realized volatility,the jump component of realized volatility,realized skewness,and realized *** higher-order moments allow us to identify the unique characteristics of financial returns,such as asymmetry and fat tails,thereby capturing various market risks such as downside risk and tail *** results show that the cryptocurrency,stock,and commodity markets are highly connected in terms of volatility and in the jump component of volatility,while their connectedness in skewness and kurtosis is ***,jump and volatility connectedness are more persistent than that of skewness and kurtosis *** rolling-window analysis of the connectedness models shows that connectedness varies over time across all moments,and tends to increase during periods of high ***,we show the potential of gold and oil as hedging and safe-haven investments for other markets given that they are the least connected to other markets across all moments and investment *** findings provide useful information for designing effective portfolio management and cryptocurrency regulations.

关键词： Spillovers High moments High frequency Hedging

Tree assemblages and diversity patterns in Tropical Juri Forest,Bangladesh

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2015年第1期26卷 159-169页

作者： Swapan Kumar Sarker Muhammad Nur-un-Nabi Md.Mohasinul Haque Mahmuda Sharmin Sanjay Saha Sonet Sourav Das Niamjit Das Department of Forestry and environmental Science Shahjalal University of Science & Technology

Juri is a biodiversity-rich primary forest in Bangladesh, which remains ecologically unexplored. We identified tree species and examined the richness, alpha（a）diversity and floristic similarity patterns within the identified communities. Vegetation and environmental data were sampled in 120（0.04 ha） study plots. Tree communities were delimited by two-way indicator species analysis（TWINSPAN）. In total, 78 tree species of 35 families and58 genera were identified. TWINSPAN identified six tree communities： A—Tricalysia singularis; B—Kydia calycina-Castanopsis tribuloides; C—Polyalthia simiarum-Duabanga grandiflora; D—Ficus roxburghii; e—Artocarpus lacucha; F—Artocarpus lacucha. Mean richness, Shannon and Gini-Simpson indices were highest for the Polyalthia simiarum-Duabanga grandiflora community, while Ficus roxburghii showed lowest diversity. Significant differences（p = 0.05） in three diversity indices were recorded between Polyalthia simiarum-Duabanga grandiflora and Ficus roxburghii. Tree compositional similarity was greatest between Kydia calycina-Castanopsis tribuloides and Polyalthia simiarum-Duabanga grandiflora（0.712）.

关键词： Two-way indicator species analysis(TWINSPAN) Richness index Shannon index Gini-Simpson index Tropical forest Conservation

evidence-based universal health coverage interventions delivery in infectious disease of poverty elimination and eradication

在线全文

学校读者我要写书评

暂无评论

Infectious Diseases of Poverty 2024年第1期13卷 90-90页

作者： ernest Tambo Chidiebere e.Ugwu Amberbir Alemayehu Anil Krishna Agnes Binagwaho Center for Leadership in Global Health equity University of Global HealthEquityKigaliRwanda Africa Disease Intelligence Preparedness and Response(ADIPR)YaoundeCameroon Higher Institute of Health Sciences Faculty of MedicineBangangteCameroon Institute for Global Health equity Research University of Global Health EquityKigaliRwanda Department of Human Biochemistry Nnamdi Azikiwe UniversityNnewiAnambraNigeria

The recent 78th united Nations General Assembly(unGA)declaration relaunched a new health priority and political commitment in accelerating universal Health Coverage(UHC),adopted by the united Nations(un)in 2015 and are intended to be met by *** mid-way point of UHC implementation,we advocate for the much needed program-matic implementation research,evidence-based interventions(eBls)policies and strategies leadership and manage-ment capacity building to enable robust,resilient and sustainable multi-sectoral partnerships,integrated coordination and governance mechanisms capabilities in accelerating UHC package mainly infectious diseases of poverty elimina-tion and eradication agenda.

关键词： elimination enable poverty

Antiinflammatory and analgesic effect of herbal cocktail Hongbaekjeong via inhibition of proinflammatory cytokines and prostaglandin e2 release

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2014年第25期59卷 3127-3133页

作者： Jinwon Lim Hyo-Jung Lee Bonglee Kim Jeong-un Choi Yoeok Shin eun Jung Sohn Sung-Hoon Kim Cancer Preventive Material Development Research Center College of Oriental Medicine Kyung Hee University

Though Hongbaekjeong(HBJ),a hebal mixture of three medicinal plants,has been traditionally used for arthritis and muscular pain,its scientific evidence still remains ***,in the present study,analgesic and anti-inflammatory mechanism of HBJ was evaluated in vitro and in *** significantly reduced NO production and prostaglandin e2(PGe2)release and also attenuated the expression of cyclooxygenase 2(COX-2)in lipopolysaccharides(LPS)and interferon(IFN)-c treated RAW 264.7 ***,HBJ abrogated the production of proinflammatory cytokines such as interleukin(IL)1b,IL-6,IL-8 and monocyte chemoattractant protein-1(MCP-1)in LPS and IFN-c treated RAW 264.7 *** addition,HBJ significantly decreased the number of writhing syndrome induced by acetic acid,and also increased latency in hot-plate method and tail flick test in ***,HBJ significantly reduced the edema volume in the hind paw of the rats with arthritis induced by Freund’s complete adjuvant(FCA)compared to untreated ***,our findings demonstrate the antiinflammatory and analgesic potential of HBJ via inhibition of proinflammatory cytokines and PGe2 release for treatment of arthritis and muscular pain.

关键词：前列腺素e2 炎性细胞因子和镇痛抗炎单核细胞趋化蛋白-1 鸡尾酒 IFN-γ

Proteomic identification and functional characterization of MYH9, Hsc70, and DNAJA1 as novel substrates of HDAC6 deacetylase activity

在线全文

学校读者我要写书评

暂无评论

Protein & Cell 2015年第1期6卷 42-54页

作者： Linlin Zhang Shanshan Liu Ningning Liu Yong Zhang Min Liu Dengwen Li edward Seto Tso-PangYao Wenqing Shui J-un Zhou State Key Laboratory of Medicinal Chemical Biology College of Life Sciences Nankai University Tianjin 300071 China High-throughput Molecular Drug Discovery Center Tianjin Joint Academy of Biotechnology and Medicine Tianjin 300457 China Molecular Oncology Program H. Lee Moffitt Cancer Center and Research Institute Tampa FL 33612 USA Department of Pharmacology and Cancer Biology Duke University Durham NC 27710 USA

Histone deacetylase 6 （HDAC6）, a predominantly cyto- plasmic protein deacetylase, participates in a wide range of cellular processes through its deacetylase activity. However, the diverse functions of HDAC6 can- not be fully elucidated with its known substrates. In an attempt to explore the substrate diversity of HDAC6, we performed quantitative proteomic analyses to monitor changes in the abundance of protein lysine acetylation in response to HDAC6 deficiency. We identified 107 proteins with elevated acetylation in the liver of HDAC6 knockout mice. Three cytoplasmic proteins, including myosin heavy chain 9 （MYH9）, heat shock cognate pro- tein 70 （HscT0）, and dnaJ homolog subfamily A member 1 （DNAJA1）, were verified to interact with HDAC6. The acetylation levels of these proteins were negatively regulated by HDAC6 both in the mouse liver and in cultured cells. Functional studies reveal that HDAC6- mediated deacetylation modulates the actin-binding ability of MYH9 and the interaction between Hsc70 and DNAJA1. These findings consolidate the notion that HDAC6 serves as a critical regulator of proteinacetylation with the capability of coordinating various cellular functions.

关键词： HDAC6 substrate lysine acetylation,quantitative proteomics interaction

Synthesis,Crystal Structure and Spectroscopic Properties of 1,2-Benzothiazine Derivatives:An experimental and DFT Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2015年第1期34卷 15-25页

作者： MUHAMMAD Nadeem Arshad TARIQ Mahmood ATHeR Faroque Khan MUHAMMAD Zia-Ur-Rehman ABDULLAH M.Asiri ISLAM Ullah Khan RIFFAT-un-Nisa KHURSHID Ayub AZAM Mukhtar MUHAMMAD Tariq Saeed Chemistry Department Faculty of ScienceKing Abdulaziz University Centre of excellence for Advanced Materials Research (CeAMR) King Abdulaziz University Department of Chemistry COMSATS Institute of Information TechnologyAbbottabad IRCBM COMSATS Institute of Information Technology Applied Chemistry Research Center PCSIR Laboratories ComplexFerozpur RoadLahore 54600Pakistan Materials Chemistry Laboratory Department of ChemistryGC University Department of Chemistry College of ScienceKing Faisal University Department of Chemistry University of EducationOkara CampusOkara-Pakistan

1,2-Benzothiazine derivatives methyl 3-methoxy-4-oxo-3,4-dihydro-2H-benzo[e] [1,2]thiazine-3-carboxylate 1,1-dioxide（1） and methyl 2-ethyl-3-hydroxy-4-oxo-3,4-dihydro-2Hbenzo[e][1,2]thiazine-3-carboxylate 1,1-dioxide（2） were synthesized, and characterized by spectroscopic techniques; 1H-NMR and infrared（IR） spectroscopy. Crystals of 1 and 2 were grown by slow evaporation of methanol and ethyl acetate, respectively and their crystal structures were investigated by single-crystal X-ray diffraction analysis. Geometric properties were calculated by the B3 LYP method of density functional theory（DFT） at the 6-31G＋（d） basis set to compare with the experimental data. Simulated properties were found in strong agreement with the experimental ones. Intermolecular forces have also been modeled in order to investigate the strength of packing and strong hydrogen bonding was observed in both compounds 1 and 2. electronic properties such as Ionization Potential（IP）, electron Affinities（eA） and coefficients of the highest occupied molecular orbital（HOMO） and the lowest unoccupied molecular orbital（LUMO） of com- pounds 1 and 2 were simulated for the first time.

关键词： 1,2-benzothiazine B3LYP/6-31+G (d) density functional theory (DFT) HUMO-LUMO crystal structures