Materials Literature
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-glucose, and is prepared by the alkaline deacetylation of chitin obtained from crab shells. Chitosan has become of great interest not only as an underutilized resource, but also as a new functional material with high potential in various fields, such as environmental and biomedical engineering (Dodane and Vilvalam, 1…
This paper studies crystallization rule of oxidized pellet based on mineralogical compositions and microstructure under different technological conditions. The research showed that the progress of crystallization can be divided into three stages, i.e coarse-grain, developing crystal and interconnection crystal. The re…
Irregular β-SiC particles were prepared by a sol-gel and carbothermal reduction route,in which(tetraethoxysilane) and phenolic resin were employed to prepare carbonaceous silicon xerogels,the precursor of the SiC.The samples were characterized by XRD,FTIR,SEM and BET.Results indicated that β-SiC was not produced in th…
The effects of yttrium on the microstructure and mechanical properties of AZ91 magnesium alloy were studied in this paper.The experimental results show that magnesium alloy (Mg-7.5Al-0.7Zn-0.15Mn-xY) organization is composed mainly of α(Mg) matrix,β(Mg_(17)Al_(12)) phase and λ(Al_2Y) phase.The Y with fixed quantity wi…
Non-isothermal crystallization behaviors of the composites consisted of poly(phenylene sulfide) and silicon dioxide nanoparticles were studied by means of differential scanning calorimetry.The Mo equation is firstly used to analyze the differential scanning calorimetry data.The results show that Mo equation can charac…
The joining of graphite, ceramic SiC and C_f/SiC composites via preceramic silicone resin(SR) at high temperature (8001400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished…
Ti2SnC dispersion-strengthened (DS) copper matrix composites were prepared by the hot-pressing method. The change of microstructure, mechanical properties, and electrical resistivity of the composites as a function of Ti2SnC volume fraction were studied. The results demonstrated that the grain size of Cu decreased pro…
Feeder pipes in CANDU® reactors are an integral part of the circulating heat transport system, connecting the in-reactor fuel channels with the primary heat transport pipes. The feeder pipes are 1.5” to 3.5” in nominal size and made out of SA-106 Grade B material. A typical CANDU 6 station has 760 feeder pipes, half o…
Permanent mould casting may be regarded as a near net shape manufacturing process where simple to very complex shaped engineering components are fabricated with high degree of precision in a metallic mould. In this group High Pressure Die Casting, HPDC, have attracted more attention because of its production rate, whe…
Myocardial delivery of genes holds great promise for treating many heart diseases; however, the optimal delivery technique, which maximizes safety and efficacy, has not been established. Two delivery techniques were evaluated in swine; percutaneous retrograde coronary venous delivery (RCVD) and direct intramyocardial…
Non-destructive space charge measurement techniques have been used to investigate space charge behavior in insulating materials. Direct multi-dimensional space charge measurement systems are also required to observe for the localized space charge distribution in applications of the insulating material. Some multi-dime…
The revision of the relevant recommendations allows to introduce new definitions of lightning impulse parameters. Experimental results have shown that the breakdown voltage of insulating materials depends on the frequency of the oscillations or overshoot near the peak and that this behaviour can be described by a test…
The Large Burn Laboratory, located at the FM Global Research Campus, is the first facility in which calorimetry techniques have been become a standard means of evaluating both sprinklered and non-sprinklered fire tests. The geometry and dimensions of the new facility result in signal distortions which are not typicall…
Woven polypropylene fabrics were impregnated with hydroxy-anthraquinone (HAQ) derivatives compounds by supercritical carbon dioxide where the HAQ worked as a dyestuff. The HAQ-impregnated fabrics were tested to adsorb metal ions dissolved in water forming the “dye-metal chelate” under specific conditions of pH for one…
The geometric and electronic local structure of LaMnO3 across the cooperative Jahn–Teller (JT) transition at TJT = 750 K has been studied by means of X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) at the Mn K-edge. XANES spectra, as a function of temperature, do not s…
Magnetostrictive bulk Fe–17 at%Ga alloy was fabricated by combining laminates of rapid-solidified ribbons (80 μm in thickness) using the spark plasma sintering/joining (SPSJ). The SPSJ is characterized by a short time, low temperature heating and sintering process. The laminated sample made by the SPSJ maintained a un…
This study examined a sample-preparation procedure in the glow-discharge mass analysis of yttria-stabilized zirconia (YSZ). We investigated a procedure for mixing it with high-purity gallium to guarantee the electrical conductivity. Several chips of single-crystal specimens were placed in the center of a homemade PTFE…
Derivatives of N‐phenyl pyrrole with a para‐donor substituent on the acceptor benzene ring are compared. It is shown that by a suitable increase of the donor strength of the pyrrolo group, CT fluorescence can be achieved even for donor‐donor substituted benzenes. On the other hand, introducing fluoro substituents into…
Structural changes of pyromellitimido-oxydianiline (PMDA-ODA) polyimide (PI) films by UV irradiation were studied by means of XAFS and XPS. UV irradiation in air was found to cause oxidative cleavage of the imide ring of the PMDA part, whereas that in vacuum changed the conjugated structure involving nitrogen but did…
The author studies the convective Cahn–Hilliard equation. Some results on the existence of classical solutions and asymptotic behavior of solutions are established. The instability of the traveling waves is also discussed.