Materials Literature
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Abstract The effect of pH on inhibition and enhancement of luminol‐H 2 O 2 ‐CO 2+ chemiluminescence (CL) by 18 phenolic compounds and 20 amino acids was studied. It was found that most of the tested compounds showed an inhibiting effect of lower pH and an enhancing effect at higher pH. At a midrange pH, for some pheno…
A propagating brush discharge (PBD) usually occurs on a highly charged thin film with a grounded metal backing plate and often becomes energetic enough to ignite a flammable gas/vapor and even a dust cloud. In an actual situation, a PBD is seen on the surface of a large-sized flexible intermediate bulk container (FIBC…
Highly-oriented ZnO films were deposited on Y2O3/Si(111) and Y2O3/Si(100) substrates by atmospheric pressure metal-organic chemical vapor deposition (MOCVD) using zinc acetylacetonate (Zn(C5H7O2)2) and oxygen as sources. The substrate temperature and O2 gas temperature were all kept at 500 °C. Y2O3, thermodynamically…
In this study we examine the mixture carbon dioxide (CO2) and 2-propanol (PrOH) as foaming agents for poly(methyl methacrylate). Gaseous CO2 was dissolved in liquid PrOH, allowing for injection of a homogenous liquid mixture into the extruder. The advantage of such a system is that the CO2/PrOH ratio remains stable, a…
The phases of variable composition Ca 3 − 3 x Nd 2 x ( A O 4 ) 2 ( A = P, V; 0 ≤ x ≤ 0.14) based on calcium orthophosphate or orthovanadate are studied by Raman spectroscopy. The influence of the composition and temperature on the structural features of these compounds is considered. The changes observed in the Raman…
Abstract There is a high interest in modifying the rheological properties of polyethylene terephthalate (PET) through structural modifications while maintaining its thermoplastic nature. This article reports real‐time spectroscopic and rheological monitoring of the effects of reactive melt modification of PET with a m…
Abstract Single‐source precursors of the type (RO) 3 Si‐X‐M, where X represents a tethering organic group and M a metal‐containing unit (metal ion or metal alkoxide group), allow the preparation of MO x /SiO 2 or M/SiO 2 nanocomposites with a controllable nanoparticle size. After sol‐gel processing, the organic groups…
The alkaline dissolution behaviour of sea–island type polyester microfibres were successfully monitored using a cationic dye staining method. Weight reduction behaviour of the alkali‐treated microfibre fabrics and the treated fabrics stained with cationic dye were investigated in a comparative manner. The termination…
The effect of temperature and type of physical foaming agent (HCFC-142b, n-pentane, and carbon dioxide) on the shear viscosity have been investigated for various types of polyolefin resins (PP, LLDPE, and HDPE). The viscosity changes have been monitored using a commercial on-line process control rheometer mounted on a…
The recently proposed split ring resonator (SRR) loaded waveguide as a simulator of a left-handed medium (LHM) is extended to the simulation of negative magnetic permeability media (NMPM) and used for the study of wave propagation in these media. The experimental results are compared with those provided by the discret…
Characterization of iron containing alumina supported catalysts was performed by transmission electron microcopy (TEM), Mo/spl uml/ssbauer, and XPS spectroscopy during formation of multiwall carbon nanotubes from acetylene at 1000 K. TEM images showed that carbon fibers (outer diameter is around 20-40 nm) were generat…
A kinetic study including dissolution process and diffusion of the dissolved molecules for a stressed solid in contact with its solution is analyzed. We estimate a condition fixing the prevailing dissipation mechanism and analyze it with a linear stability criterion. This criterion depends on which process is limiting…
For the purpose to demonstrate effectiveness of high-temperature nuclear heat utilization, Japan Atomic Energy Research Institute has been developing a hydrogen production system and has planned to connect the hydrogen production system to High Temperature Engineering Test Reactor (HTTR). Prior to construction of a HT…
In thermobonded nonwovens, the design of the bond point geometry is of major importance to the desired mechanical behavior. Despite the geometry's significance the selection is subject to a trial and error approach. This paper describes a numerical method for the prediction of the nonwovens tensile behavior depending…
ABSTRACT: A natrolite-cemented palagonite ash tuff unit is reported in a palaeo-basin in northeast Jordan. Phillipsite and chabazite are also identified. The zeolites were formed due to transformation of volcanic glass granules into palagonite by the reaction with percolating water in a closed hydrological system. Con…
The effects of alloying elements (Cu-Ni, Mo, and Ti) in line pipe steels on the susceptibility to sulfide stress cracking (SSC) was studied with respect to hydrogen permeation, crack nucleation, and crack propagation. The SSC susceptibility was evaluated using a constant elongation rate test (CERT) method in a NACE St…
Hydrophilic and chemically reactive porous media were prepared by adsorbing functional polymers at the surface of sintered polyethylene membranes. Modification of the membrane was accomplished by first exposing the membrane to an oxygen glow discharge gas plasma to introduce an electrostatic charge at the membrane sur…
Abstract Supported molybdena catalysts, with TiO 2 , CeO 2 and Al 2 O 3 supports, were studied by XPS and ISS. It was found that reliable results are obtained only when samples are calcined and transferred into the ultrahigh vacuum system without further contact with the ambient atmosphere (‘ in situ calcination’). Th…
Abstract This paper discusses how detailed studies on flammability at elevated pressures and temperatures can be applied to liquid‐phase oxidation of cyclohexane using air/oxygen and lead to an inherently safer process with better productivity. Flammability tests of cyclohexane/oxygen vapor and vapor bubbles under act…
We measured the angles produced in the Plateau border region of ‘dry’ soap films. In a simple experimental geometry, we demonstrated that a negative line tension can be attributed to these regions. This result has important consequences for the theoretical description of foams approaching the dry limit.