Materials Literature
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There has been fewer new hydraulic power plants being built in Korea, and the existing power equipment has gradually been aged. Understandably, older plants require more maintenance to keep up the system performance. An effective asset management of power equipment has become a great necessity from both economical and…
Two sets of samples (CdTe solar cells) were investigated at -1V within a temperature range of 300K-393K. We discuss Shockley-Read-Hall recombination /generation (SRH R-G) as applied to CdTe and the assumptions used to yield trap energy levels in CdTe. Observed activation energies of the J-V characterization made with…
The effect of self-generated seeded thermal hydrolysis factors, such as TiOSO4 solution concentration, grey aging time, volume ratio of TiOSO4 to pre-adding water, and heating rate on high-purity TiO2 size for PTC thermistor were studied. The samples were characterized by particle size distribution, and SEM. The resul…
A functionally graded material (FGM) spacer, which the distribution of dielectric permittivity inside an insulator changes spatially, can considerably reduce the electric field concentration around a high-voltage electrode and along the gas-insulator interface when compared to a conventional spacer with a uniform perm…
Rhodamine 6G (R6G) and Poly(methyl methacrylate) (PMMA) light-guided films accompanied with titanium dioxide thin layer were prepared by spin-coating process onto on glass substrate. Dichloromethane was used as disperser for blending R6G and PMMA. The TiO2 layer thickness was varied by controlling spinning speed. The…
the properties of the alumina ceramics depends directly on the ceramic slurry performance, effects of slurry polymerization of many factors, mainly including the slurry pH value, temperature, initiator. This paper focuses on the study of the factors affecting the performance of slurry, received a specific parameter va…
Thin films of Cu(In,Ga)Se2with various copper contents as functions of the copper and gallium contents were deposited by co-evaporation onto thermally oxidized silicon wafer (100). In-situ Real Time Spectroscopic Ellipsometry (RTSE) is used to understand the effect of the Ga/(In+Ga) ratio and the Cu atomic % on the gr…
The composites composed of micro-sized calcium copper titanate (CCTO) and nano-sized metallic nickel (Ni) fillers in the polyvinylidene fluoride (PVDF) matrix (Ni/CCTO/PVDF) were prepared, in which the filler content (volume fraction) of Ni and CCTO was set at 60 %. The impedance spectra and a serial equivalent circui…
H-BN coatings can be achieved by the Polymer Derived Ceramics (PDCs) route on metallic substrate, i.e. titanium. The ceramization process is led via an optical treatment by IR irradiation to overcome the problem of the metal stability at high temperature (needed in classical process). Structural and chemical character…
Porcelain insulator has a long history of being used in power transmission and distribution due to the good strength, chemical resistance capacity and mature manufacturing technology. However, there are some disadvantages of porcelain materials which could be the barrier for the development of porcelain insulators suc…
This paper studies the effect of impact damage on carbon/epoxy laminates which have undergone hygrothermal ageing. Three stratifications have been chosen whereby the first layup is the classical type used in the industry and the other two are of quasi-isotropic/quasi-homogeneous properties consisting fibres orientated…
The highly uniform spherical Si-based oxynitride core-shell structured phosphors with narrow size distribution and non-aggregation were successfully fabricated by the h-BN protective method for the first time. Firstly, the raw metallic ions (rare earth and alkaline earth ions) were coated on the surface of SiO2 templa…
The atomic behavior of epoxy groups on a graphene oxide sheet was observed during high thermal heat annealing using a reactive force-field based on molecular dynamics simulations. We found the oxygen-containing functional groups interplay with each other and desorbed from the graphene oxide sheet by a form of O2 gas i…
In traditional NC systems, the linear, index and S curve acceleration and deceleration control methods exist lots of problems that jerk is discontinuous or algorithm is too complex, seeking a more superior acceleration and deceleration control method to make up these shortages is needed. In this paper, the Four polyno…
Generally, there are two ways available for porosity measurement of porous metals. One is by calculating density ratio of a porous metal and a corresponding non-porous metal, called as relative density method. The other is by counting the percentage of pores on cross section of a porous metal, called as image analysis…
Abstract A cheaper, greener approach for the synthesis of highly monodisperse and tunable size CdSe semiconductor quantum dots was developed by thermolysis of a mixed solution of CdO and Se in non‐coordinating solvent 1‐octadecene at 240°C. Systematic vary of the precursor molar ratios allowed the particle size (from…
The hexagonal phase NaYF4 (Na(Y1.5Na0.5)F6, β-NaYF4 type) is a kind of ideal host materials for upconversion luminescence with high efficiency. The synthesis of monophase hexagonal NaYF4:Yb3+/Er3+ nanoparticles has been investigated by solvothermal processing under 200° for 24hrs. It was found that solvents adopted ha…
CBN particles coated with borosilicate glass-aluminum composite coating (Glass-Al-CBN) were prepared by a multilayer coating method. The coated composite particles were sintered at 800°C for 2h. XRD, DTA-TG, SEM techniques were used to characterize the samples. It was found that AlN was formed by the reaction of Al an…
Currently the most efficient solar cells are based on III–V semiconductor materials. When combined with Concentrated Photovoltaic (CPV) systems, the efficiency is further increased and the required amount of semiconductor material is decreased, which makes CPV a potential candidate to achieve low cost solar energy [1]…
The twin boundary motion in Ni-Mn-Ga Heusler alloys has been investigated using Monte Carlo simulations. The Hamiltonian of system includes magnetic and elastic parts and two magnetoelastic terms. It is shown that the twin boundary shifts in a magnetic field at the constant temperature. The spin and strain volume frac…