Materials Literature
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SiC/AIN composites with controlled interfacial solid solution were employed in the present work for investigating the effects of interfacial bonding and A1N polytypes on the mechanical properties. Platelike A1N polytypes and interfacial bonding were found to have substantial effects on the flexural strength, hardness,…
Shrinking device geometry has produced a need for lower dielectric constant materials for intermetal dielectric to reduce circuit RC time constants and intertrace ‘‘cross-talk’’ capacitance and reduce power consumption at high frequency. One such material is F-doped SiO2. This study utilized an electron cyclotron reso…
The nucleation and evolution of deformation patterns occurring during transgranular stress corrosion cracking (TGSCC) were studied in an attempt to produce new alternatives for addressing the nature of the embrittlement process. Flat, tensile α-brass (72% Cu-28% Zn) specimens were tested in 5 M aqueous ammonia (NH4OH)…
To simulate the electrochemical properties of acceptor‐doped lanthanum chromites as interconnectors for solid oxide fuel cells, theoretical analyses of the distribution of oxygen chemical potential, ionic leak current density, and area specific resistance are given. The results of the calculations using previously rep…
Facet formation and competition in selective epitaxial growth (SEG) of Si on SiO2− masked nanometer growth windows were studied experimentally and theoretically in gas source molecular beam epitaxy. The windows were patterned along [110] on Si(100) substrates. Mass accumulation around the edge of the SEG mesa top surf…
Hot-fillable, re-fillable, high oxygen-barrier and high UV-barrier containers cannot be conveniently made with poly(ethylene terephthalate). Copolyesters of terephthalic acid, 2,6-naphthalenedicarboxylic acid and ethylene glycol, prepared through either melt-polycondensation or blending, are very promising material fo…
When surface plasmon polaritons propagate on a corrugated surface, an energy gap opens up in the dispersion of the surface mode. We present the results of an experimental technique that directly images this gap. The technique is used to measure the width and the central frequency of the gap as a function of the gratin…
The heat transfer rate and efficiency of TE (thermoelectric) cooling systems were investigated. The emphasis of the present study is focused on the use of large-scale TE refrigerators for air conditioning applications. A one-dimensional heat transfer analysis was performed to determine the cooling power and electricit…
As the semiconductor industry inches towards integrated circuit technology based on silicon chips with features just 200 nm wide, researchers are trying to build carbon-based electronic devices that are hundreds of times smaller. These devices would be based on the remarkable electronic properties of carbon nanotubes…
We calculated the electronic states of ferroelectric perovskite oxides, A TiO 3 , using the discrete variational Xα cluster method. The bond order of the π bonds between Ti 3 d and O 2 p as a function of titanium ion displacement in PbTiO 3 shows a maximum. This result suggests that the magnitude of ferroelectricity i…
The stability and kinetics of unfolding and refolding of the P167T mutant of the TEM-1 beta-lactamase have been investigated as a function of guanidine hydrochloride concentration. The activity of the mutant enzyme was not significantly modified, which strongly suggests that the Glu166-Thr167 peptide bond, like the Gl…
Isoelectric focusing of MCF-7 cell extracts revealed an association of the glycolytic enzymes glyceraldehyde 3-phosphate-dehydrogenase, phosphoglycerate kinase, enolase, and pyruvate kinase. This complex between the glycolytic enzymes is sensitive to RNase. p36 could not be detected within this association of glycolyt…
By using high conductivity carbon fibers in a graphitizable carbon matrix, very high values for the thermal conductivity of a composite can be obtained in the direction parallel to the fibers. The carbon matrix of this material exhibits anisotropy and is oriented in the direction of the fibers. Thermal conductivity of…
Bacterial and fungal strains were isolated from enrichment cultures using diethylphthalate, diethylterephthalate, or ethylene glycol dibenzoate as sole carbon sources.Aureobacterium, Flavobacterium, andMicrococcus species were isolated from diethylphthalate enrichments;Rhodococcus andXanthomonas species were isolated…
The miscibility of pectin (P), starch (S), and glycerol (G) in films was investigated by dynamic mechanical analysis (DMA), tensile measurements, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and film dissolution studies. DMA revealed that P/S/G films exhibit up to three thermody…
The atmospheric corrosion of zinc in the presence of particles has been investigated at 300 and 373 K in air‐water vapor mixtures. The development of corrosion products was followed by several in situ techniques, including Fourier transform infrared spectroscopy, x‐ray diffraction, pH measurements, and scanning Kelvin…
The occurrence of ester-interchange reactions during PET/PBT blend processing has been confirmed by 13C-NMR measurements. The limitations of the method for precise quantification of the extent of reaction between high molecular weight polyester blends have also been pointed out. Titanium alkoxide has been confirmed as…
Nanotube formation is not limited to carbon , and in fact seems to be a general feature of layered materials. The classes of new nanotubes that have been synthesized, e.g., boron‐nitride‐containing compounds and transition‐metal dichalcogenides, are briefly reviewed. Theoretical predictions, such as the type II BC 2 N…
A continuous culture system that allows bacteria to be grown in steady-state populations under pressures of up to 700 atm (71 MPa) was constructed and tested. With readily available or slightly modified high-pressure chromatography equipment, a continuous flow of sterile medium is pressurized and passed through a 500-…
A conducting polymer-based chemical sensor was fabricated by depositing a film containing polyaniline blended with polyethylene oxide and doped with copper chloride onto interdigitated electrodes in a surface cell configuration. It was found to be very sensitive to alcoholic vapours, especially methanol. Its character…