Surface potential measurements: Implementation and interpretation
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Synthesis of carbon nanoflasks
The catalytic reaction of Co(CO)3NO and Mg at 900 °C has led to the formation of multi-walled carbon nanoflasks.
Nucleation and Growth Process of Sticking Particles in Ferritic Stainless Steel.
Nucleation and growth process of sticking particle in ferritic stainless steels was investigated using a two-disk type hot rolling simulator. The sticking behavior was strongly dependent on the surface roughness of a high speed steel roll (HSS) and the oxidation resistance of the ferritic stainless steels. A sticking…
Experimental investigation into mechanical destruction of intumescent chars
The paper presents a broad discussion on the problem of mechanical destruction of intumescent chars in the application to fire protection of buildings in conditions of fires and protection of rocket engines in conditions of intensive mass and heat flows. Data on mechanical strength of various types of chars in hot and…
Organic hybrid of chlorinated polyethylene and hindered phenol. III. Influence of the molecular weight and chlorine content of the polymer on the viscoelastic properties
The influences of the molecular weight and chlorine content of chlorinated polyethylene (CPE) on the dynamic mechanical propertiesof an organic hybrid consisting of CPE and 3,9-bis[1,1-dimethyl-2{β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane (AO-80) were investigated…
Utilization of oxidative pressure for enhanced production of poly-beta-hydroxybutyrate and poly(3-hydroxybutyrate-3-hydroxyvalerate) in Ralstonia eutropha.
Ralstonia eutropha was cultivated under oxidative conditions in the presence of hydrogen peroxide and methyl viologen to stimulate the flux of NADPH to the PHA biosynthesis pathway. The effects of oxidants on the biosynthesis of poly-beta-hydroxybutyrate(PHB) and poly(3-hydroxybutyrate-3-hydroxyvalerate)[P(3HB-3HV)] w…
Explicit Computation of Orthonormal Symmetrized Harmonics with Application to the Identity Representation of the Icosahedral Group
A novel method to explicitly compute orthonormal symmetrized harmonics is presented and the method is applied to the identity representation of the icosahedral group. Spherical viruses have icosahedral symmetry and the motivating application is the parametric representation of spherical viruses for use in inverse prob…
Dielectric‐State Analysis in Solid‐Solution Pb(Yb 1/2 Ta 1/2 )O 3 –Pb(Lu 1/2 Nb 1/2 )O 3
The structure and temperature dependence of complex lead perovskite dielectrics were investigated for the system (1 − x )Pb(Yb 1/2 Ta 1/2 )O 3 – x Pb(Lu 1/2 Nb 1/2 )O 3 . Superlattice reflections for the compositions 0.8 < x < 1.0 were observed by X‐ray diffractometry, and the temperature‐composition dielectric‐…
Nanocrystalline $Mg{Al}_2{O}_4$:Measurement of Thermodynamic Properties Using a Solid State Cell
Most materials in their nanocrystalline state exhibit unusual properties. The tremendous enhancement of mechanical, physical, and chemical properties caused by the fine admixture of order (inside the crystallites) and disorder (in the grain boundary regions) is being exploited in a number of frontier technologies. A c…
Competitive Grain Growth and Texture Evolution during Directional Solidification of Superalloys
The development of crystallographic texture during directional solidification has been analysed quantitatively in columnar castings of the Ni-base superalloys, CMSX4 and CM186LC, produced with a range of cooling rates. The area density of grains having axiaI orientations within a specified scatter from <OOl> and the i…
Synthesis of Poly-Titanosilazanes and Conversion into Si3N4-TiN Ceramics.
(1) Poly-titanosilazanes were synthesized by chemical modification with Ti(X)4 [X=N(CH3)2, OCH(CH3)2]. The chemical structure of the synthesized precursors was studied using IR and 1H NMR techniques. The polytitanosilazanes were found to contain some N-Ti bonds.(2) [Si-Ti-O-C-N] multicomponent amorphous powders were s…
Porous mullite and mullite-based composites by chemical processing of kaolinite and aluminium metal wastes
Porous mullite and mullite-based composites have been prepared from a chemical processing route starting from a precursor obtained using an aqueous suspension of kaolinite and aluminium hydroxide. This was coprecipitated with kaolinite using ammonium hydroxide or hexamethylenediamine (HMDA), and a solution of aluminiu…
Analysis of characteristics of water flash evaporation under low-pressure conditions
The relation between the maximum heat transfer coefficient and the saturation temperature of vapor for water flash evaporation under low-pressure conditions is theoretically analyzed. The optimum evaporation time is introduced by analytical consideration to reflect the experimental result of the linearity of the super…
The liquid crystal phases: Physics and technology
Liquid crystals are interesting both for fundamental reasons and because of their application in display device technology. I give an overview of the liquid crystal phases. I then describe in more detail some of the basic physics of nematic liquid crystals, concentrating on those pieces of physics which underly displa…
Development in the Active Packaging of Foods
Active packaging is one of the innovative food packaging concepts that has been introduced as a response to the continuous changes in current consumer demands and market trends. Major active packaging techniques are concerned with substances that absorb oxygen, ethylene, moisture, carbon dioxide, flavours/odours and t…
Effect of silicon and phosphorus on the degradation of polyurethanes
A series of polyurethanes containing silicon and phosphorus was prepared from 4,4′-diphenylmethane diisocyanate (MDI), poly(tetramethylene ether glycol) (PTMG), diphenylsilanediol (DSiD), and methylphosponic acid (MPA). 1H-NMR spectra determined the qualitative and quantitative characteristics of these polymers. The t…
DSC and solid state NMR characterization of hydroxyethylcellulose/polyether films
Thin solid films of hydroxyethylcellulose/oligoether were obtained by a grafting reaction of HEC with diisocyanates, and were then characterized by DSC, FTIR, NMR and complex impedance techniques. The transparency of these films in the visible range of the electromagnetic spectrum, the low Tg, the good chain mobility…
XPS analysis of the activation process in non-evaporable getter thin films
The surface activation process of sputter-coated non-evaporable getter (NEG) thin films based on Ti–Zr and Ti–Zr–V alloys has been studied in situ by means of x-ray photoelectron spectroscopy. After exposure of the NEG thin films to ambient air they become reactivated after a thermal treatment in an ultrahigh vacuum.…
Spontaneous phase transition from relaxor to macrodomain ferroelectric state in single-crystal PbSc0.5Nb0.5O3-BaSc0.5Nb0.5O3 solid solutions
The cooling of Pb 1− x Ba x Sc 0.5 Nb 0.5 O 3 solid solutions with x ≤0.04 leads to a spontaneous transition from a relaxor to a macrodomain ferroelectric state, accompanied by anomalous variation of the dielectric and optical properties of the material. As the barium content in the system increases, the relaxor state…
Synthesis and polarized light-induced birefringence of new polymethacrylates containing carbazolyl and azobenzene pendant groups
Low Tg copolymers of [11(N-carbazolyl)undecylmethacrylate] and [2,5-dimethylphenyl-[(4-nitrophenyl)azo]-phenoxyalkylmethacrylate] have been synthesized and the polarized light-induced birefringence of thick films (70 μm) has been investigated at a constant deducted temperature relative to Tg (T − Tg = 10 °C). The opti…