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Analysis of Phase Structure of Al-Al3(Ti,V,Zr) Composite Alloy Prepared by Vacuum Arc Melting
No full textBONDING STRUCTURE AND OPTICAL BANDGAP OF RF-SPUTTERED HYDROGENATED AMORPHOUS-SILICON CARBIDE ALLOY-FILMS
No full textHydrogenated amorphous silicon carbide (a-Si1-xCx:H) alloy films were deposited by radio frequency (rf) magnetron sputtering at room temperature with variable rf powers. Effects of deposition parameters on the bonding structure and optical properties of the films were measured. Infrared (IR) absorption and optical transmittance measurements of films deposited under methane gas flow rates of 2 and 3 sccm showed that they differed. In the case of 2 sccm flow rate, the optical bandgaps gradually decreased with increasing rf power and slopes, B, of the Tauc plot increased up to a power of 5 W/cm2. In the case of 3 sccm flow rate, optical bandgaps increased and the slopes were invariant with power. This difference is attributed to the differences in the bond structure of the films. Under the condition of flow methane gas flow rate as in the former case, the Si-C bonding concentration is saturated and those of Si-H(n) bonds still increase while those of C-H(n) bonds decrease with power. However in the latter, both concentrations of Si-C and Si-H(n) bonds increase and those of C-H(n) bonds decrease. As a result, optical bandgaps of rf sputtered films which have a high fraction of carbon, greater than 0.65, are more influenced by the Si-C bonds than by the hydrogen-related bonds
Compositional Effect on Phase Stability and Hardness of Al66Mn9(Ti,Zr)25 Intermetallic Compounds
No full textSynthesis of Al3M and (AlM)3M Intermetallic Dispersion-Strengthened Al Alloys by Mechanical Alloying
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A correction to optimum alloy composition for design of high-temperature high-strength Al-Ti-V-Zr alloys through thermodynamic calculations
No full textCOARSENING PHENOMENON OF L1(2) PRECIPITATES IN RAPIDLY SOLIDIFIED AL-3AT-PERCENT(TI,V,ZR) SYSTEM
No full textDynamic-response of a laminated plate with friction damping
No full textA sandwich-type plate with metal facings and felt core, fastened by bolts, was studied using both test and finite-element analysis. This type of plate is cheap, light, damping-effective and without pollution; therefore, it is widely used in astronautical engineering. The tests were conducted for different felt thicknesses, bolt numbers, and fastening forces. The results show that the damping depends on friction between the plates and the felt. As compared with an identical stiffness solid plate, the damping of laminated plates can be increased up to 30 times. A mesh with rectangular elements was adopted in the finite-element analysis. In accordance with the slipping mechanism, a rectangular plate clamped on one edge was analyzed with the foregoing elements to determine the resonant frequency and the damping. The difference between the calculated and tested results was within 5 percent for the resonant frequency.</div
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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