Materials Literature
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We systematically study the pristine and doped chromium arsenide (CrAs) in six different crystal structures to investigate the structural, magnetic, and optical properties for real applications by first-principles calculations. First, we found that the ground-state structure is an orthorhombic MnP-type structure with…
研究了Zr的添加对含Ti和Hf的NiAl/Cr(Mo)基共晶合金微观组织及压缩性能的影响.结果表明,少量Zr的添加会显著细化合金共晶胞内的NiAl/Cr(Mo)层片,优化共晶胞界区域的NiAl和Cr(Mo)相尺寸;随着Zr含量的增加,共晶胞界的NiAl和Cr(Mo)相明显粗化,且共晶胞界的Heusler相呈半连续状分布;当Zr的含量增加至1%(原子分数)时,共晶胞界的Heusler相形成连续的网状,且有粗大的富Cr相形成.Zr的添加促进了合金中NiAl和Cr(Mo)相中粗大b-NiAl和a-Cr相的析出,且Heusler相形成元素在析出相界面的偏聚导致了大量界面位错的形成.此外,Zr的添加导致...
综合评述了作者几年来先后完成的Hf含量对Ni-16Si,Hf和Sn对Ni-20Ti-5Cr-3Al-18Si,Zr含量对Ni-22Ti-16Si,Ta含量对Nb-22Ti-16Si-7Cr-3Al和稀土元素Dy和Ho对Ni-23Ti-10Ta-2Cr-18Si和Ni-22Ti-16Si-7Cr-3Al-3Ta-2Hf等合金组织结构和力学性能影响的研究工作.合金元素Hf,Zr,Sn+Hf,Ta,Dy和Ho加入Nb-Si二元系或多元系合金,明显提高其室温和高温屈服强度和塑性以及断裂韧性.强度的提高与合金元素的固溶强化有关,塑性、韧性的改善与组织的细化和超过临界尺寸的固溶体(Nb,Ti)ss颗粒增多...
采用OM,SEM和TEM研究了一种Ni-Cr-W-Fe合金在760℃长期时效过程中的显微组织变化,测试了合金室温和高温力学性能,对拉伸断口进行了分析.结果表明,1100℃固溶后合金平均晶粒尺寸约为80 mm,晶内包含退火孪晶.760℃时效后合金中析出M23C6和g'相.g'相尺寸约为29 nm,体积分数约为19%.760℃长期时效后,g'颗粒平均尺寸与时间t满足Ostwald方程.固溶态合金具有优异的室温塑性,拉伸断口具有韧性断裂形貌.时效态合金室温屈服强度明显增加,塑性下降.随760℃保温时间延长,合金室温和高温屈服强度缓慢降低.与时效态合金相比,1000~3000 h时效后的合金室温塑性降...
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space grou…
An experimental technique for the indirect manipulation and detection of electron spins entangled in two-dimensional magnetoexcitons has been developed. The kinetics of the spin relaxation has been investigated. Photoexcited spin-magnetoexcitons were found to exhibit extremely slow relaxation in specific quantum Hall…
Graphene, a one-atom thick sheet of carbon, exhibits incredible structural flexibility, electrical transport, and optical responses. And remarkably, the graphene electronic structure can be varied through interlayer coupling, nanoscale patterning, and electrical gating. In this project we made significant contribution…
TiO2 nanocrystals (rod shape, ≤ 100 nm) were synthesized from TTIP/H2O2/H2O systems, and utilized as photocatalysts for degradation of humic acids (HAs) in the aqueous solution. The high purity TiO2 nanocrystals were obtained by excluding the use of inorganic acids that might consequently cause contamination of active…
Cellular reorientation upon cyclic stretch is an intriguing phenomenon, which has drawn intensive scientific attentions lately. When applying uni-axial cyclic stretches to cells on substrate, they gradually rotated themselves to almost perpendicular to the stretch direction [1]. The characteristic time of the cellular…
Electron transfer organic reaction rates are considered employing the classic physical picture of Marcus wherein the heats of reaction are deposited as the energy of low frequency mechanical oscillations of reconfigured molecular positions. If such electron transfer chemical reaction events occur in the neighborhood o…
We determine the distribution of free ends and the monomer insertion potential in the strongly-stretched limit for regularly and statistically branched polymer brushes. We find that the end density flattens in the limit of very strong branching with a concomitant enhancement of the grafting surface end density. This e…
Objective: Collagen is an important biomaterial in medical applications due to its special characteristics of biodegradability and weak antigenicity. Collagens from many sources possess specific biological properties that make potential ingredient of health promoting food. Jellyfish is a rich source of collagen, which…
CdS thin films were deposited on glass substrates by using successive ionic layer adsorption and reaction (SILAR) method at room temperature. The effect of SILAR growth cycles on structural, morphological, optical and electrical properties of the films has been studied. The thickness of the deposited film is measured…
In this report we analyze a subset of chemical equations that have equal numbers of elements and unknown coefficients; linear algebraically, these relate to n X n matrix systems. Here we associate inhomogeneous eigenvector occurrences to structural properties of chemical equations.
By using cyclohexanol as feedstock and potassium permanganate and heteropoly acid as feedstock, adipic acid can be obtained with the aid of ultrasonic wave. The quality of adipic acid is significantly improved. The effects of the reaction conditions on oxidation of cyclohexanol to adipic are mainly discussed. The expe…
We systematically study chromium arsenide in various crystal structures in order to investigate the structural, magnetic and electronic properties for real applications. The calculations are performed within the density functional framework using the projected augmented plane wave method as employed in VASP code. Usin…
The In Vessel Viewing System (IVVS) will be one of the essential machine diagnostic systems at ITER to provide information about the status of in-vessel and plasma facing components and to evaluate the dust inside the Vacuum Vessel. The current design consists of six scanning probes and their deployment systems, which…
When producing ammonium fluoric salts, NH+4 ions, the concentration of which can vary in a broad range, enter the acidic wastewater. The peculiarity of wastewater that is formed at enterprises for production of ammonium fluoric salts is its inconstant composition dependent on the assortment of fabricated products, whi…
The present study deals with the investigation of effect of reinforcement (Zirconium dioxide) particles on mechanical properties of aluminium alloy (Al6061) composites, fabricated by stir casting method. The MMC’s specimens were prepared by varying weight fraction of the reinforced particles as 0 Wt.%, 2.5 Wt.%, 5 Wt.…
Objective: The aim of this study is to synthesis zinc substituted magnetite nanoparticles with higher values of saturation magnetization and testing its antibacterial activity. Methods: The particles of zinc substituted magnetite with the composition ofZn x Fe 3- x O 4 (х = 0.0, 0.2, 0.3, 0.4, 0.5) were prepared using…