Materials Literature
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The dissimilar metal weld joint(DMWJ) in primary water system of pressurized water reactors(PWRs) has been proven to be a vulnerable component owing to its proneness to different type of flaws. Thus,maintaining integrity of such joint in case of defect presence is of great importance to the design and safe management…
As a newly-developed method, acoustic cloak made of pentamode materials is on its speedway to the promising potential application. However, physical fabrication of pentamode cloak with continuously varying material parameters can be a tough work, if not totally impossible. Layering is a natural compromise to bypass th…
Molybdenum disulfide (MoS 2 ), a new binary transition-metal compoundhas attracted much attention due to its unique physical and chemical properties. MoS 2 with different morphology structures were firstly reviewed, including inorganic fullerene-like, sphere-like, flower-like, wire, plate, rod, tube and so on. And the…
Carbon microspheres(CMSs) were surface modified by the acid oxidation method and then grafted with aniline(An) by chemical synthesis to prepare compound CMSs-An. The CMSs-An/PET composite materials were prepared by melt blending CMSs- An and polyethylene glycol terephthalate(PET). The morphology, dispersiveness, therm…
Abstractauthoren We study the vibrational, magnetic and transport properties of Few Layer Graphene (FLG) using Raman and electron spin resonance spectroscopy and microwave conductivity measurements. FLG samples were produced using wet chemical exfoliation with different post-processing, namely ultrasound treatment, sh…
Two-dimensional (2D) electron gas with high-mobility is found in wurtzite ZnO/Zn(Mg)O heterostructure, which probably arises from the polarization discontinuity at the ZnO/Zn(Mg)O interface, and the 2D electron gas in the heterostructure is usually also regarded as resulting from polarization-induced charge. In order…
A series of Ge-Se chalcogenide glasses incorporated with same molar percentage of Ga, Sn, Sb and Te are synthesized by melt-quenching method. The variations of optical band gaps doped with different elements are investigated by absorption spectra, and the relationship of optical band gap with glass network structure i…
The lattice parameters and band-gap of native rutile TiO2 are investigated by the first-principles calculations of local density approximation+U method with different U values for Ti-3d (0 U 9 eV). The electronic structures and optical properties of different content C doped rutile TiO2 systems are also studied by the…
Based on the properties of the artificial magnetic conductor (AMC), a broadband low radar cross-section (RCS) reflection screen covering X and Ku band is designed and fabricated. The reflection screen is formed by combining two AMC cells, i.e., AMC1 with a dual band Jerusalem cross structure, and AMC2 with a wideband…
In this paper, the process of the free dendritic growth of Mg-0.5 wt.%Al alloy in the basal plane (0001) is simulated in two-dimensional system by using a quantitative phase-field model. A convergence study is carried out to choose the optimal coupling parameter λ and grid width Δx/W0 in simulation. Then we systematic…
The excellent surface passivation scheme for suppression of surface recombination is a basic prerequisite to obtain high efficiency solar cells. Particularly, the HIT (heterojunction with intrinsic thin-layer) solar cell, which possesses an abrupt discontinuity of the crystal network at an interface between the crysta…
A nanometer scale mechanism for micro crack propagation under uniaxial tension in single crystals is investigated using phase field crystal (PFC) simulation. The uniaxial tensile loading is strain controlled. And three initial typical stresses of pre-existing center crack in (111) crystal plane of face centered cubic…
It is well known that diamond is one of the most ideal cutting tool for materials, but the rapid tool wear can make surface integrity of the machined surface decline sharply during the nanometric cutting process for a single crystal silicon. Thus, a research on the wear mechanism of the diamond tool is of tremendous i…
Previously reported crystalline structures obtained by an iterative phase retrieval reconstruction of their diffraction patterns seem to be free from displaying any irregularities or defects in the lattice, which appears to be unrealistic. We demonstrate here that the structure of a nanocrystal including its atomic de…
Water extracts of cassava leaves (Manihot esculenta) has been studied as a corrosion inhibitor for steel in sulfuric acid solution. Cassava Leaf Extracts are Soluble in Water (CLESW) is obtained by evaporation. Cassava leaves so that the hot steam flows wither. Cassava leaves are withered squeezed resulting in a water…
In this work, a zero index magnetic metamaterial (ZIMM) is designed based on the two-dimensional array of ferrite rods periodically arranged in the air. By calculating the photonic band structures within the framework of multiple scattering theory and retrieving the effective electric permittivity εeff and effective m…
Li2MnSiO4 is one of the potential cathode materials for lithium batteries due to its high capacities, but the poor conductivity hinders its further development. The cycling performance and electrochemical property of Li2MnSiO4 cathode material can be improved by doping metal cation. Twelve structures LixMn1-yMySiO4 (x…
摘要： 碎米蕨属(Cheilosoria Trevis.)隶属碎米蕨类, 由于形态上的趋同进化, 使得该类群的系统分类一直存在争议。该研究对该碎米蕨属植物的4种叶绿体DNA序列片段(rbcL/matK/rps4/rps4-trnS)进行PCR扩增和序列分析, 再结合其它相关类群, 用贝叶斯法和最大似然法构建系统树并探讨其系统发育关系。结果表明, 碎米蕨属不是一个单系类群, 旧世界分布的碎米蕨属植物(薄叶碎米蕨除外)均聚在亚洲Cheilanthes群内, 与粉背蕨属(Aleuritopteris Fée)等类群形成不同亚支。该属孢子形态具有明显异质性。薄叶碎米蕨(Cheilosoria tenuifolia (Burm. f.) T…
КОМПЬЮТЕРНОЕ МОДЕЛИРОВАНИЕ МЕСТНЫХ И ОБЩИХ ФОРМПОТЕРИ УСТОЙЧИВОСТИ ТОНКОСТЕННЫХ ОБОЛОЧЕК Д.А.Баранова, В.В
Holographic three-dimensional (3D) display is a true 3D display technique, which can provide realistic image of a real object or a scene because holography has the ability to reconstruct both the intensity and phase information, i.e., the wave front of the object or scene. Therefore, it could allow the observers to pe…