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hybrid reinforced thermoset polymer composite in energy absorption tube application:A review

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Defence Technology（防务技术） 2018年第4期14卷 291-305页

作者： A.b.M.supian s.M.sapuan M.Y.M.Zuhri E.s.Zainudin h.h.Ya Department of Mechanical and Manufacturing Engineering Universiti Putra Malaysia Laboratory of bio Composite Technology Institute of Tropical Forestry and Research Products (INTROP)Universiti Putra Malaysia Department of Mechanical Engineering Universiti Teknologi Petronas

The custom of hybridization fibre composite in energy absorption tube application has gained the attention of structural crashworthiness in composite material industry. Thus, the approach of this review is to understand the effect in hybridization within metal/synthetic fibre composite, synthetic/synthetic fibre composite and nature/synthetic fibre composite as energy absorption tube, which reflects on the energy absorption characteristics and crashworthiness behaviors in previous the study. by way of instance, a wide range of methodology and particular parameter in previous study such as the effect in fibre arrangement, matrix polymer, technique of fabrication, fibre treatment(natural fibre), design in geometry/cross-section and others mechanism of hybrid fibre composite tube are highlighted which to comprehend the capability of the mechanical performance and collapsible behavior as sacrificial structure in high-performance structure applications. Moreover, in the recently studies there have been many of the research regarding structural materials as energy absorption tube has been introduced such as metal/matrix composites, new alloy metals and polymer composites which intended to evaluate the performance of these materials into circumstance in loading and impact characteristic. Therefore, this review article is trying to explore the research articles related to the effect of hybridization fibres and thermoset polymer as reinforcement for energy absorption tube research and expected would provide an information and idea which to expend the knowledge in future study of hybridization effect for energy absorption tube, moreover the development for future potential as new hybrid composite fibre materials from the natural/synthetic fibres reinforced composite material in employing of high-performance energy absorption tube application is still less discover and highlighted.

关键词： Energy absorption tube hybrid composites Collapse behavior Crashworthiness

Analysis of global and local stress changes in a longwall gateroad

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International Journal of Mining science and Technology 2018年第1期28卷 127-135页

作者： I.b.Tulu G.s.Esterhuizen D.Gearhart T.M.Klemetti K.M.Mohamed D.w.h.su Department of Mining Engineering West Virginia University NIOsh Pittsburgh Mining Research Division

A numerical-model-based approach was recently developed for estimating the changes in both the horizontal and vertical loading conditions induced by an approaching longwall *** this approach, a systematic procedure is used to estimate the model's *** along the bedding planes is modeled with ubiquitous joint elements and interface *** is modeled with a newly developed coal mass *** response of the gob is calibrated with back analysis of subsidence data and the results of previously published laboratory tests on rock *** model results were verified with the subsidence and stress data recently collected from a longwall mine in the eastern United states.

关键词： Longwall mining Gateroad design Flac3D horizontal angle Gob loading hollow inclusion cells

Effect of corrosion product films on the in vitro degradation behavior of Mg-3%Al-1%Zn(in wt%) alloy in hank's solution

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Journal of Materials science & Technology 2018年第10期34卷 1756-1764页

作者： b.J.wang D.K.Xu J.h.Dong w.Ke school of Environmental and Chemical Engineering Shenyang Ligong University CAs Key Laboratory of Nuclear Materials and safety Assessment Institute of Metal Research Chinese Academy of Sciences Environmental Corrosion Center Institute of Metal Research Chinese Academy of Sciences

Through investigating the corrosion behavior of an as-extruded Mg-3wt%gAl-lwt%Zn （AZ31） alloy in a simulated physiological fluid of hank＇s solution, it demonstrates that the corrosion process was depen- dent on the immersion time. Further analyses revealed that the highest corrosion resistance could be obtained at 24 h due to the formation of a compact layer of corrosion products on the sample surface. with increasing the immersion time to up to 48 h, the thickness of surface films increased gradually but obvious de-bonding of such film from the substrate could take place, resulting in a certain resilience of the overall corrosion resistance.

关键词： Magnesium surface layer Corrosion product Interface

Revisiting Laser-Intensity-Dependent Ionization and Fragmentation of C60

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Chinese Physics Letters 2021年第8期38卷 32-37页

作者： D.P.Dong b.h.Yang D.b.Qian w.C.Zhou s.F.Zhang X.Ma Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of sciences Beijing 100049China

we revisit the laser-intensity-dependent ionization and fragmentation yields of C60 molecules irradiated by 25-fs,798-nm laser pulses based on the approach in which photoions are measured via a velocity map imaging spectrometer working in a time-sliced *** approach dramatically improves the signal-to-background ratio compared to those using a simple(traditional)time-of-flight mode(spectrometer),and thus allows us to measure the laser-intensity dependences down to a previously untouched region,which is expected to provide new insights into the intense-field ionization and fragmentation of ***,we find that the saturation intensities for C60 ionizations and the onset intensity for C60 fragmentation are much lower than those reported in previous ***,the derived saturation-intensity dependence on charge distribution demonstrates the validity of the over-the-barrier ionization using a conducting sphere model.

关键词： fragmentation saturation ionization

sIMULATION OF ThE MAGNETIZATION REVERsAL PROCEss OF RECTANGLE-shAPED NiFe FILM ELEMENTs UNDER AN ORThOGONAL MAGNETIC FIELD

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Acta Metallurgica sinica(English Letters) 2005年第5期18卷 642-646页

作者： w.L. Zhang R.J. Tang w.X. Zhang b. Peng h. C. Jiang h.w. Zhang school of Microelectronics and solid-state Electronics University of Electronic science and Technology of China Chengdu 610054 China

The magnetization reversal process of nano-size rectangle-shaped NiFe film elements with different aspect ratios have been investigated under the orthogonally applied magnetic fields by micromagnetic simulation. Different magnetization reversal modes can appear depending on whether the bias field is applied or not. when there is no bias field, double “C” state is the initial reversal state. however, when there is a bias field, “s” state is the starting mode. The larger the aspect ratio is, the larger the switching field is. but, when the aspect ratio is larger than 3, the increase of the switching field ceases. These results can provide useful information to the application of the patterned NiFe film with rectangular elements.

关键词： NiFe film element micromagnetics aspect ratio magnetization reversal,switching field

Dispersion and Damage of Carbon Nanotubes in Carbon Nanotube/7055Al Composites During high-Energy ball Milling Process

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Acta Metallurgica sinica(English Letters) 2021年第2期34卷 196-204页

作者： s.bi b.L.Xiao Z.h.Ji b.s.Liu Z.Y.Liu Z.Y.Ma shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China school of Material science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China AVIC Manufacturing Technology Institute Beijing 100024China

high-energy ball milling(hEbM)combined with powder metallurgy route was used to fabricate carbon nanotube(CNT)reinforced 7055 Al *** powder morphology evolution processes(hEbM-1 and hEbM-2)were designed to investigate the dispersion and damage of CNTs during hEbM ***-1 evolution process involved powder fl attening,cold-welding and fracture,while hEbM-2 evolution process consisted of powder fl attening and *** hEbM-1,the repetitive fracture and cold-welding process was effective for dispersing ***,the powder fl attening process in hEbM-2 was unsuccessful in dispersing CNTs due to two reasons:(1)the thickness of fl aky Al powders exceeded the critical value,and(2)the clustered CNTs embedded in fl aky Al powders could not be *** of the broadening of D band and the appearance of a new defect-related D’band,product of I D/I G and full width half maximum of D band,rather than I D/I G,was used to evaluate the actual damage of *** indicates that the damage of CNTs was severe in powder fl attening and fracture stages,while the damage of CNTs was small in powder cold-welding stage.

关键词： Metal matrix composites Carbon nanotubes Powder evolution Dispersion and damage Powder metallurgy

Control of purity and entanglement for two spatially two-separated qubits via phase damping

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Chinese Physics b 2012年第10期21卷 115-121页

作者： A.s.F.Obada h.A.hessian A.b.A.Mohamed M.hashem Faculty of science Al-Azhar UniversityNasr CityCairoEgypt Faculty of science Assiut UniversityAssiutEgypt Faculty of science Al-Baha UniversityAl-BahaSaudi Arabia Al-Aflaj Community College Salman Bin Abdulaziz University Al-AflajSaudi Arabia

Control of purity and entanglement of two two-qubits dispersively coupled to a field with a reservoir are *** the qubits are entangled,while the field is either in a coherent state or a statistical mixture of two coherent *** an alternative entanglement measure we calculate the negativity of the eigenvalues of the partially transposed density matrix.A measure related to the mutual entropy,namely the index of entropy,is employed to measure the *** results agree well with the *** is found that the entanglement and purity have strong sensitivity to phase *** asymptotic behaviour of the states of the field,the two two-qubits,and the total system fall into mixed states.

关键词： entanglement phase damping purity separated qubits

Robust half-Metallicity in a Chromium-substituted AlN

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Chinese Physics Letters 2011年第10期28卷 270-273页

作者： s.Arif Iftikhar Ahmad b.Amin h.A.Rahnamaye Aliabad Materials Modeling Laboratory Department of PhysicsHazara UniversityMansehraPakistan Department of Physics University of MalakandChakdaraPakistan Department of Physics Sabzevar Tarbiat Moallem UniversitySabzevarIran

we investigate half metallicity in a chromium(Cr)-substituted AlN dilute magnetic semiconductor using the full-potential linearized augmented plane-wave *** results show that Al_(0.75)Cr_(0.25)N is half metal and holds a net integer magnetic moment of 3μβwith lattice *** half−metallic nature is maintained from the relaxed lattice constant 4.36Åto 4.09Å.An abrupt change of the physical properties is observed at a robust transition lattice constant of 4.09Å,and the material transforms from half metal to *** find that up to 6%compression,the material maintains its half-metallic ***,we also confirm that the origin of ferromagnetism in Al_(0.75)Cr_(0.25)N is double exchange.

关键词： metallic lattice chromium

Cohomogeneity One de sitter space s1 n

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Acta Mathematica sinica,English series 2010年第10期26卷 1915-1926页

作者： P.AhMADI s.M.b.KAshANI h.AbEDI Department of Pure Mathematics Faculty of Mathematical SciencesTarbiat Modares University Group of Mathematics School of Sciences Bu-Ali Sina University

In this paper we study the cohomogeneity one de sitter space s1 n. we consider the actions in both proper and non-proper cases. In the first case we characterize the acting groups and orbits and we prove that the orbit space is homeomorphic to R. In the latter case we determine the groups and consequently the orbits in some different cases and prove that the orbit space is not hausdorff.

关键词： Cohomogeneity one Lorentzian space de sitter space