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Pyridinic-N doping carbon layers coupled with tensile strain of FeNi alloy for activating water and urea oxidation 被引量:1
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作者 Guangfu Qian Wei Chen +5 位作者 Jinli Chen Li Yong Gan Tianqi Yu Miaojing Pan Xiaoyan Zhuo Shibin Yin 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第4期684-694,共11页
Exploitation of oxygen evolution reaction(OER)and urea oxidation reaction(UOR)catalysts with high activity and stability at large current density is a major challenge for energy-saving H_(2) production in water electr... Exploitation of oxygen evolution reaction(OER)and urea oxidation reaction(UOR)catalysts with high activity and stability at large current density is a major challenge for energy-saving H_(2) production in water electrolysis.Herein,we use the pyridinic-N doping carbon layers coupled with tensile strain of FeNi alloy activated by NiFe_(2)O_(4)(FeNi/NiFe_(2)O_(4)@NC)for efficiently increasing the performance of water and urea oxidation.Due to the tensile strain effect on FeNi/NiFe_(2)O_(4)@NC,it provides a favorable modulation on the electronic properties of the active center,thus enabling amazing OER(η_(100)=196 mV)and UOR(E_(10)=1.32 V)intrinsic activity.Besides,the carbon-coated layers can be used as armor to prevent FeNi alloy from being corroded by the electrolyte for enhancing the OER/UOR stability at large current density,showing high industrial practicability.This work thus provides a simple way to prepare high-efficiency catalyst for activating water and urea oxidation. 展开更多
关键词 Carbon-encapsulated tensile strain Catalyst Oxygen evolution reaction Urea oxidation reaction
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Tensile Strain Capacity Prediction of Engineered Cementitious Composites (ECC) Using Soft Computing Techniques
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作者 Rabar H.Faraj Hemn Unis Ahmed +2 位作者 Hardi Saadullah Fathullah Alan Saeed Abdulrahman Farid Abed 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第3期2925-2954,共30页
Plain concrete is strong in compression but brittle in tension,having a low tensile strain capacity that can significantly degrade the long-term performance of concrete structures,even when steel reinforcing is presen... Plain concrete is strong in compression but brittle in tension,having a low tensile strain capacity that can significantly degrade the long-term performance of concrete structures,even when steel reinforcing is present.In order to address these challenges,short polymer fibers are randomly dispersed in a cement-based matrix to forma highly ductile engineered cementitious composite(ECC).Thismaterial exhibits high ductility under tensile forces,with its tensile strain being several hundred times greater than conventional concrete.Since concrete is inherently weak in tension,the tensile strain capacity(TSC)has become one of the most extensively researched properties.As a result,developing a model to predict the TSC of the ECC and to optimize the mixture proportions becomes challenging.Meanwhile,the effort required for laboratory trial batches to determine the TSC is reduced.To achieve the research objectives,five distinct models,artificial neural network(ANN),nonlinear model(NLR),linear relationship model(LR),multi-logistic model(MLR),and M5P-tree model(M5P),are investigated and employed to predict the TSCof ECCmixtures containing fly ash.Data from115 mixtures are gathered and analyzed to develop a new model.The input variables include mixture proportions,fiber length and diameter,and the time required for curing the various mixtures.The model’s effectiveness is evaluated and verified based on statistical parameters such as R2,mean absolute error(MAE),scatter index(SI),root mean squared error(RMSE),and objective function(OBJ)value.Consequently,the ANN model outperforms the others in predicting the TSC of the ECC,with RMSE,MAE,OBJ,SI,and R2 values of 0.42%,0.3%,0.33%,0.135%,and 0.98,respectively. 展开更多
关键词 Engineered cementitious composites fly ash curing time tensile strain capacity MODELING
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Engineering Ru(IV)charge density in Ru@RuO2 core-shell electrocatalyst via tensile strain for efficient oxygen evolution in acidic media 被引量:5
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作者 Yizhi Wen Tao Yang +3 位作者 Chuanqi Cheng Xueru Zhao Enzuo Liu Jing Yang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第8期1161-1167,共7页
The design of efficient Ru-based electrocatalysts with high intrinsic activities for acidic water oxidation is highly desirable and challenging for water splitting in proton exchange membrane electrolyzers.Here,for th... The design of efficient Ru-based electrocatalysts with high intrinsic activities for acidic water oxidation is highly desirable and challenging for water splitting in proton exchange membrane electrolyzers.Here,for the first time,we engineer the charge density of Ru(IV)by creating tensile strains in the RuO2 shell of Ru@RuO2 core-shell nanoparticles,viz.Ru@RuO2-L.High-resolution spectroscopic characterizations confirm the presence of av.6%tensile strain in Ru-O bonds,which results in an effective reduction of the Ru(IV)charge density.The resultant Ru^X+(4<X<5)active sites greatly accelerate the oxygen evolution reaction(OER)in an acidic electrolyte,leading to a remarkably low overpotential of 191 mV at 10 mA cm^-2.These values are lower than those for the benchmark RuO2 catalyst and are also among the lowest for efficient Ru-based electrocatalysts reported thus far.The specific activity and mass activity are also greatly enhanced 4.2-fold and 17.7-fold compared to those of RuO2,respectively.The acidic OER activity improvement is ascribed to the lowered adsorption energy of*OOH,owing to the reduced charge density of Ru(IV),and the rapid charge transport owing to the Ru core.Ru@RuO2-L also demonstrates high feasibility as the anode catalyst for the overall water splitting in acidic media. 展开更多
关键词 tensile strain Core-shell structure Ruthenium oxide Charge density Oxygen evolution reaction Acidic media
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Study of valence intersubband absorption in tensile strained Si/SiGe quantum wells
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作者 林桂江 赖虹凯 +2 位作者 李成 陈松岩 余金中 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第9期3479-3483,共5页
The hole subband structures and effective masses of tensile strained Si/Sil-yGey quantum wells are calculated by using the 6 × 6 k·p method. The results show that when the tensile strain is induced in the qu... The hole subband structures and effective masses of tensile strained Si/Sil-yGey quantum wells are calculated by using the 6 × 6 k·p method. The results show that when the tensile strain is induced in the quantum well, the light-hole state becomes the ground state, and the light hole effective masses in the growth direction are strongly reduced while the in-plane effective masses are considerable. Quantitative calculation of the valence intersubband transition between two light hole states in a 7nm tensile strained Si/Si0.55Ge0.45 quantum well grown on a relaxed Si0.5Ge0.5 (100) substrates shows a large absorption coefficient of 8400 cm^-1. 展开更多
关键词 SI/SIGE tensile strain effective mass valence intersubband transition
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Valence band structure and density of states effective mass model of biaxial tensile strained silicon based on k·p theory
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作者 匡潜玮 刘红侠 +2 位作者 王树龙 秦珊珊 王志林 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第12期335-340,共6页
After constructing a stress and strain model, the valence bands of in-plane biaxial tensile strained Si is calculated by k·p method. In the paper we calculate the accurate anisotropy valance bands and the splitti... After constructing a stress and strain model, the valence bands of in-plane biaxial tensile strained Si is calculated by k·p method. In the paper we calculate the accurate anisotropy valance bands and the splitting energy between light and heavy hole bands. The results show that the valance bands are highly distorted, and the anisotropy is more obvious. To obtain the density of states (DOS) effective mass, which is a very important parameter for device modeling, a DOS effective mass model of biaxial tensile strained Si is constructed based on the valance band calculation. This model can be directly used in the device model of metal-oxide semiconductor field effect transistor (MOSFET). It also a provides valuable reference for biaxial tensile strained silicon MOSFET design. 展开更多
关键词 biaxial tensile strained Si k · p theory valance band density of state effective mass
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The role of strain in oxygen evolution reaction
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作者 Zihang Feng Chuanlin Dai +5 位作者 Zhe Zhang Xuefei Lei Wenning Mu Rui Guo Xuanwen Liu Junhua You 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第6期322-344,I0009,共24页
The oxygen evolution reaction(OER)is a crucial step in metal-air batteries and water splitting technologies,playing a significant role in the efficiency and achievable heights of these two technologies.However,the OER... The oxygen evolution reaction(OER)is a crucial step in metal-air batteries and water splitting technologies,playing a significant role in the efficiency and achievable heights of these two technologies.However,the OER is a four-step,four-electron reaction,and its slow kinetics result in high overpotentials,posing a challenge.To address this issue,numerous strategies involving modified catalysts have been proposed and proven to be highly efficient.In these strategies,the introduction of strain has been widely reported because it is generally believed to effectively regulate the electronic structure of metal sites and alter the adsorption energy of catalyst surfaces with reaction intermediates.However,strain has many other effects that are not well known,making it an important yet unexplored area.Based on this,this review provides a detailed introduction to the various roles of strain in OER.To better explain these roles,the review also presents the definition of strain and elucidates the potential mechanisms of strain in OER based on the d-band center theory and adsorption volcano plot.Additionally,the review showcases various ways of introducing strain in OER through examples reported in the latest literature,aiming to provide a comprehensive perspective for the development of strain engineering.Finally,the review analyzes the appropriate proportion of strain introduction,compares compressive and tensile strain,and examines the impact of strain on stability.And the review offers prospects for future research directions in this emerging field. 展开更多
关键词 Oxygen evolution reaction strain generation tensile strain Compressive strain strain mechanism strain effects
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Direct-bandgap electroluminescence from tensile-strained Ge/SiGe multiple quantum wells at room temperature
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作者 何超 刘智 +3 位作者 张旭 黄文奇 薛春来 成步文 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第11期427-430,共4页
Tensile-strained Ge/SiGe multiple quantum wells (MQWs) were grown on a Ge-on-Si virtual substrate using ultrahigh vacuum chemical vapor deposition on an n+-Si (001) substrate. Direct-bandgap electroluminescence f... Tensile-strained Ge/SiGe multiple quantum wells (MQWs) were grown on a Ge-on-Si virtual substrate using ultrahigh vacuum chemical vapor deposition on an n+-Si (001) substrate. Direct-bandgap electroluminescence from the MQWs light emitting diode was observed at room temperature. The quantum confinement effect of the direct-bandgap transitions is in good agreement with the theoretical calculated results. The redshift mechanism of emission wavelength related to the thermal effect is discussed, 展开更多
关键词 Ge multiple quantum wells tensile strain ELECTROLUMINESCENCE
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Cell membrane tensile strain under cyclic compression:A viscoelastic myoblast finite element model
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作者 Jingyi Jia Shurui Chong +1 位作者 Lu Yu Yifei Yao 《Medicine in Novel Technology and Devices》 2022年第4期87-94,共8页
Cyclic mechanical stimulation could lead to subsequent biomechanical and biological effects on cells.Viscoelastic cells could deform or show energy dissipation with hysteresis behavior in response to external cyclic c... Cyclic mechanical stimulation could lead to subsequent biomechanical and biological effects on cells.Viscoelastic cells could deform or show energy dissipation with hysteresis behavior in response to external cyclic compression.The aim of this study was to investigate the effect of cyclic compression on a single viscoelastic myoblast through a confocal–based cell–specific finite element model,including cell membrane tensile strain and damaged elements.Sinusoidal compression was applied to the apical surface of the myoblast(cell membrane)with compressive stress of 500500 Pa(with stress offset at 500 Pa and amplitude of 500 Pa)at 0 Hz(static compression of 500 Pa),0.25 Hz,0.5 Hz,0.75 Hz,1 Hz,5 Hz,and 10 Hz.Results showed that the ratio of average tensile strain integral in all cell membrane elements over a certain period of time(T)to that duration(T)(MAS index)decreased under cyclic compression compared to that of static compression in the short term(within 4 s).Furthermore,compared to static compression,the percentage of damaged elements of cell membrane under cyclic compression decreased assuming a 3%cell membrane tensile strain damage threshold.The optimal cyclic compression frequency 0.25 Hz led to the largest difference of MAS index under cyclic compression and static compression.These results may provide support for the application of cyclic compressive stimulation in the prevention of cell damage. 展开更多
关键词 Cell membrane tensile strain VISCOELASTICITY Cyclic compression Finite element analysis
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Wide-Band Polarization-Independent Semiconductor Optical Amplifier Gate with Tensile-Strained Quasi-Bulk InGaAs
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作者 王书荣 刘志宏 +6 位作者 王圩 朱洪亮 张瑞英 丁颖 赵玲娟 周帆 王鲁峰 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2004年第8期898-902,共5页
A semiconductor optical amplifier gate based on tensile strained quasi bulk InGaAs is developed.At injection current of 80mA,a 3dB optical bandwidth of more than 85nm is achieved due to dominant band filling effect... A semiconductor optical amplifier gate based on tensile strained quasi bulk InGaAs is developed.At injection current of 80mA,a 3dB optical bandwidth of more than 85nm is achieved due to dominant band filling effect.Moreover,the most important is that very low polarization dependence of gain (<0 7dB),fiber to fiber lossless operation current (70~90mA) and a high extinction ratio (>50dB) are simultaneously obtained over this wide 3dB optical bandwidth (1520~1609nm) which nearly covers the spectral region of the whole C band (1525~1565nm) and the whole L band (1570~1610nm).The gating time is also improved by decreasing carrier lifetime.The wide band polarization insensitive SOA gate is promising for use in future dense wavelength division multiplexing (DWDM) communication systems. 展开更多
关键词 semiconductor optical amplifier gate wide bandwidth polarization insensitive tensile strained quasi bulk InGaAs fiber to fiber lossless operation current extinction ratio
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ON THE TENSILE MECHANICAL PROPERTY OF Si-Mn TRIP STEELS AT HIGH STRAIN RATE 被引量:8
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作者 X.C. Wei, L. Li, R.Y. Fu and W. ShiSchool of Materials Science and Engineering, Shanghai University, Shanghai 200072, China Manuscript received 18 June 2001 in revised form 7 November 2001 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2002年第3期285-294,共10页
Tensile mechanical properties of 1.6Si-1.58Mn-0.195C TRIP (transformation-induced plasticity) steels under high strain rate and effects of DP (dual-phase) treatments were studied and compared to the quasi-static tensi... Tensile mechanical properties of 1.6Si-1.58Mn-0.195C TRIP (transformation-induced plasticity) steels under high strain rate and effects of DP (dual-phase) treatments were studied and compared to the quasi-static tensile behavior. The results show that the increasing of strain rate leads to increasing in their strengths and decreasing in the uniform elongation remarkably. Because the stable retained austenite in TRIP steel can transform to martensite during tensile testing and the material exhibits excellent characteristic of transformation induced plasticity, the plastic deformation behavior is evidently improved and the combination of strength and elongation is superior to that of dual-phase steel, although its strength is smaller than that of DP steel. However, DP treated steel shown lower elongation under dynamic tension in spite of higher strength. A model was proposed to explain the excellent elongation rate of TRIP steel compared with DP steel on the basis of SEM analysis and the strength of the components in microstructure. 展开更多
关键词 automobile sheet steel TRIP steel high strain rate tensile impact
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Effects of Strain Rate and Texture on the Tensile Behavior of Pre-strained NiCr Microwires
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作者 周秀文 QI Yidong +6 位作者 LIU Xudong NIU Gao YANG Bo YANG Yi ZHU Ye YU Bin 吴卫东 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2018年第2期459-465,共7页
The stress–strain behavior and strain rate sensitivity of pre-strained Ni80Cr20(Ni20Cr) were studied at strain rates from 4.8×10^(–4)s^(–1) to 1.1×10^(–1)s^(–1). Specimens were prepared throug... The stress–strain behavior and strain rate sensitivity of pre-strained Ni80Cr20(Ni20Cr) were studied at strain rates from 4.8×10^(–4)s^(–1) to 1.1×10^(–1)s^(–1). Specimens were prepared through cold drawing with abnormal plastic deformation. The texture of the specimen was characterized using electron backscatter diffraction. Results revealed that the ultimate tensile strength and ductility of the pre-strained Ni20Cr microwires simultaneously increased with increasing strain rate. Twinning-induced negative strain rate sensitivity was discovered. Positive strain rate sensitivity was present in fracture flow stress, whereas negative strain rate sensitivity was detected in flow stress values of σ_(0.5%) and σ_(1%). Tensile test of the pre-strained Ni20Cr showed that twinning deformation predominated, whereas dislocation slip deformation dominated when twinning deformation reached saturation. The trends observed in the fractions of 2°-5°, 5°-15°, and 15°-180° grain boundaries confirmed that twinning deformation dominated the first stage. 展开更多
关键词 tensile behavior strain rate sensitivity Ni20Cr microstructure characterization microwire
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Stress and strain analysis on the anastomosis site sutured with either epineurial or perineurial sutures after simulation of sciatic nerve injury 被引量:4
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作者 Guangyao Liu Qiao Zhang +1 位作者 Yan Jin Zhongli Gao 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第29期2299-2304,共6页
The magnitude of tensile stress and tensile strain at an anastomosis site under physiological stress is an important factor for the success of anastomosis following suturing in peripheral nerve injury treatment. Sciat... The magnitude of tensile stress and tensile strain at an anastomosis site under physiological stress is an important factor for the success of anastomosis following suturing in peripheral nerve injury treatment. Sciatic nerves from fresh adult cadavers were used to create models of sciatic nerve injury. The denervated specimens underwent epineurial and perineurial suturing. The elastic modulus (40.96 + 2.59 MPa) and Poisson ratio (0.37 + 0.02) of the normal sciatic nerve were measured by strain electrical measurement. A resistance strain gauge was pasted on the front, back left, and right of the edge of the anastomosis site after suturing. Strain electrical measurement results showed that the stress and strain values of the sciatic nerve following perineurial suturing were lower than those following epineurial suturing. Scanning electron microscopy revealed that the sciatic nerve fibers were disordered following epineurial compared with perineurial suturing. These results indicate that the effect of perineurial suturing in sciatic nerve injury repair is better than that of epineurial suturing. 展开更多
关键词 sciatic nerve injury epineurial suture perineurial suture strain electrical measurement anastomosis site tensile stress tensile strain elastic modulus Poisson ratio BIOMECHANICS peripheral nerve injury neural regeneration
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Achieving ultra-large tensile strain in nanoscale Si mechanical metamaterials
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作者 Yuheng Huang Kuibo Yin +3 位作者 Zijian Gao Binghui Li Meng Nie Litao Sun 《Science China Materials》 SCIE EI CAS 2024年第12期4040-4048,共9页
Compared with the inherent brittleness of bulk silicon(Si)at ambient temperature,the nanosized Si materials with very high strength,plasticity,and anelasticity due to size effect,are all well-documented.However,the ul... Compared with the inherent brittleness of bulk silicon(Si)at ambient temperature,the nanosized Si materials with very high strength,plasticity,and anelasticity due to size effect,are all well-documented.However,the ultimate stretchability of Si nanostructure has not yet been demonstrated due to the difficulties in experimental design.Herein,directly performing in-situ tensile tests in a scanning electron microscope after developing a protocol for sample transfer,shaping and straining,we report the customized nanosized Si mechanical metamaterial which overcomes brittle limitations and achieves an ultra-large tensile strain of up to 95%using the maskless focused ion beam(FIB)technology.The unprecedented characteristic is achieved synergistically through FIB-induced size-softening effect and engineering modification of mechanical metamaterials,revealed through analyses of finite element analysis,atomic-scale transmission electron microscope characterization and molecular dynamics simulations.This work is not only instructive for tailoring the strength and deformation behavior of nanosized Si mechanical metamaterials or other bulk materials,but also of practical relevance to the application of Si nanomaterials in nanoelectromechanical system and nanoscale strain engineering. 展开更多
关键词 Si size effect mechanical metamaterial nanostructure tensile strain
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Uneven deposition on the Al electrode under tension strain
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作者 Jie He Le Yang +4 位作者 Na Li Wei-Li Song Shuqiang Jiao Hao-Sen Chen Daining Fang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第8期98-103,I0004,共7页
Structural deformation and dendrite formation, which would impact the electrochemical processes of rechargeable metal batteries, are usually observed in the high-energy density metal electrodes. Herein,we design an in... Structural deformation and dendrite formation, which would impact the electrochemical processes of rechargeable metal batteries, are usually observed in the high-energy density metal electrodes. Herein,we design an in-situ optical mechano-electrochemical system to study Al deposition on the Al electrode in non-aqueous Al batteries under non-uniform strain. Inhomogeneous distribution of applied strain is realized by creating an oval hole in the Al electrode. The results of the in-situ experiments suggest that the dense Al deposition, which is related to the evolution of surface morphology and increasing reactive sites, is achieved in the regions of stress concentration. The evolution of surface morphology is monitored by the in-situ tension experiments using scanning electron microscope and atomic force microscope.Besides, a qualitative mathematical model is employed to analyze the changes of the local reaction rate owing to the changed surface morphology and the cracks of oxide film under tensile stress. The results are useful to understand the Al deposition when the mechanical force is applied to the metal electrode. 展开更多
关键词 Metal electrode In-situ devices Al deposition Surface morphology tensile strain
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Tensile behaviors of ecological high ductility cementitious composites exposed to interactive freeze-thaw-carbonation and single carbonation
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作者 Chai Lijuan Guo Liping +2 位作者 Chen Bo Tang Yongjian Fei Xiangpeng 《Journal of Southeast University(English Edition)》 EI CAS 2019年第3期367-373,共7页
To explore the tensile property parameters in the structural design of bridge deck link slabs made by ecological high ductility cementitious composites (Eco-HDCC), the tensile properties of Eco-HDCC exposed to interac... To explore the tensile property parameters in the structural design of bridge deck link slabs made by ecological high ductility cementitious composites (Eco-HDCC), the tensile properties of Eco-HDCC exposed to interactive freeze-thaw-carbonation cycles and single carbonation cycles were studied. The carbonation front of Eco-HDCC was determined by X-ray diffraction and differential scanning calorimetry-thermal gravimetric methods. Results indicate that the carbonation front of Eco-HDCC after interaction tests is deeper than that of Eco-HDCC after single carbonation tests. In addition, the ultimate tensile strength for Eco-HDCC shows an increasing trend after the interaction of 1 to 5 cycles compared with that of virgin specimens, while the ultimate tensile strength decreases after the interaction of 10 to 15 cycles. For single carbonation tests, the ultimate tensile strength of Eco-HDCC increases as cycles increase. After being subjected to interaction and single carbonation environments, both the ultimate tensile strain and tensile strain energy of Eco-HDCC decrease as cycles increase, and the decrease degrees of Eco-HDCC after interaction cycles are larger than those of Eco-HDCC after single carbonation. For general consideration, the tensile stress-strain relationship of Eco-HDCC after the interaction of 15 cycles can be adopted in the design of bridge deck link slabs for the purpose of safety. 展开更多
关键词 ecological high ductility cementitious composites (Eco-HDCC) interaction cycle single carbonation carbona-tion front tensile stress-strain curve tensile strain energy
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Strain-induced magnetism in ReS_2 monolayer with defects 被引量:2
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作者 张小欧 李庆芳 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第11期430-433,共4页
We investigate the effects of strain on the electronic and magnetic properties of ReS2 monolayer with sulfur vacancies using density functional theory.Unstrained ReS2 monolayer with monosulfur vacancy(Vs) and disulf... We investigate the effects of strain on the electronic and magnetic properties of ReS2 monolayer with sulfur vacancies using density functional theory.Unstrained ReS2 monolayer with monosulfur vacancy(Vs) and disulfur vacancy(V(2S))both are nonmagnetic.However,as strain increases to 8%,VS-doped ReS2 monolayer appears a magnetic half-metal behavior with zero total magnetic moment.In particular,for V(2S)-doped ReS2 monolayer,the system becomes a magnetic semiconductor under 6%strain,in which Re atoms at vicinity of vacancy couple anti-ferromagnetically with each other,and continues to show a ferromagnetic metal characteristic with total magnetic moment of 1.60μb under 7%strain.Our results imply that the strain-manipulated ReS2 monolayer with VS and V(2S) can be a possible candidate for new spintronic applications. 展开更多
关键词 monolayer defects magnetism ferromagnetic candidate vicinity fabrication strain magnetization tensile
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Deformation behaviour in advanced heat resistant materials during slow strain rate testing at elevated temperature
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作者 Mattias Calmunger Guocai Chai +1 位作者 Sten Johansson Johan Moverare 《Theoretical & Applied Mechanics Letters》 CAS 2014年第4期20-25,共6页
In this study, slow strain rate tensile testing at elevated temperature is used to evaluate the influence of temperature and strain rate on deformation behaviour in two different austenitic alloys. One austenitic stai... In this study, slow strain rate tensile testing at elevated temperature is used to evaluate the influence of temperature and strain rate on deformation behaviour in two different austenitic alloys. One austenitic stainless steel (AISI 316L) and one nickel-base alloy (Alloy 617) have been investigated. Scanning electron microscopy related techniques as electron channelling contrast imaging and electron backscattering diffraction have been used to study the damage and fracture micromechanisms. For both alloys the dominante damage micromech- anisms are slip bands and planar slip interacting with grain bounderies or precipitates causing strain concentrations. The dominante fracture micromechanism when using a slow strain rate at elevated temperature, is microcracks at grain bounderies due to grain boundery embrittlement caused by precipitates. The decrease in strain rate seems to have a small influence on dynamic strain ageing at 650℃. 展开更多
关键词 dynamic strain ageing slow strain rate tensile testing FRACTURE DAMAGE
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Effect of Lattice Mismatch on Luminescence of ZnO/Si Hetero-Structure 被引量:2
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作者 傅竹西 孙贤开 +1 位作者 朱俊杰 林碧霞 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第2期239-244,共6页
The photoluminescence (PL) and Raman spectra of undoped ZnO films deposited directly on Si substrate (sample A),on Si substrate through a SiC buffer layer (sample B),and on a ZnO crystal wafer (sample C) are i... The photoluminescence (PL) and Raman spectra of undoped ZnO films deposited directly on Si substrate (sample A),on Si substrate through a SiC buffer layer (sample B),and on a ZnO crystal wafer (sample C) are investigated. There are emission peaks centered at 3.18eV (ultraviolet,UV) and 2.38eV (green) in these sampies. Comparing the Raman spectra and the variation of the PL peak intensities with annealing atmosphere, we conclude that the luminescence of the samples is related to the tensile strain in the ZnO film due to the lattice mismatch between the film and the substrate. In particular, the tensile strain reduces the formation energy of OZn antisite oxygen defects,which generate the green emission center. After annealing in oxygen-rich atmosphere, many OZn defects are generated. Thus, the intensity of green emission in ZnO/Si hetero-structure materials increases due to tensile strain in ZnO films. 展开更多
关键词 ZnO/Si hetero-structure LUMINESCENCE lattice mismatch biaxial tensile strain
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Self-healing of engineered cementitious composites at simulated summer conditions
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作者 LEPECH M.D 《Rare Metals》 SCIE EI CAS CSCD 2007年第S1期267-273,共7页
Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this paper.Uniaxial tension tests were used to generate ... Self-healing of engineered cementitious composites(ECC) subjected to a cyclic drying and wetting regime simulated summer outdoor environment was investigated in this paper.Uniaxial tension tests were used to generate multiple cracks in ECC specimens deformed to varying tensile strains.To quantify self-healing,resonant frequency measurements were conducted throughout drying-wetting cycles followed by tensile testing of self-healing ECC specimens.It was found that through self-healing the resonant frequency of ECC can recover 81% to 90% of initial values while showing a distinct rebound in stiffness of cracked ECC after self-healing.For specimens pre-loaded to high levels of strain between 2% and 3%,the tensile strain after self-healing can recover from 1.8% to 2.2%.Also,the effects of temperature during cyclic regime can lead to an increase in the ultimate strength of the material while slightly decreasing the strain-hardening capacity of ECC due to further hydration of unreacted cement and fly ash. 展开更多
关键词 ECC SELF-HEALING cyclic drying and wetting resonance frequency tensile stress tensile strain
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Effects of high temperature rapid thermal annealing on Ge films grown on Si(001) substrate
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作者 刘智 成步文 +3 位作者 李亚明 李传波 薛春来 王启明 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第11期463-466,共4页
Tensile strain, crystal quality, and surface morphology of 500 nm thick Ge films were improved after rapid thermal annealing at 900 ℃ for a short period (〈 20 s). The films were grown on Si(001) substrates by ul... Tensile strain, crystal quality, and surface morphology of 500 nm thick Ge films were improved after rapid thermal annealing at 900 ℃ for a short period (〈 20 s). The films were grown on Si(001) substrates by ultra-high vacuum chemical vapor deposition. These improvements are attributed to relaxation and defect annihilation in the Ge films. However, after prolonged (〉 20 s) rapid thermal annealing, tensile strain and crystal quality degenerated. This phenomenon results from intensive Si-Ge mixing at high temperature. 展开更多
关键词 Ge film rapid thermal annealing tensile strain Si-Ge mixing
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