Is there a re-entrant spinodal in liquid water ?
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Estimation of Quality of Mixing
Abstract The character of mixing was interpreted through the energy consumption. It was correlated with the quality of mixing which is described by two parameters: average degree of dispersion and coefficient of heterogeneity. Experiments were carried out for polyethylene-based compounds with various fillers and typic…
High pressure electrical resistivity studies on Ga-Te glasses
Bulk, semiconducting GaxTe100-x (17 ≤ x ≤ 25) glasses are prepared by the meltingh quenching method and electrical resistivity measurements are carried out at high pressures up to 8 GPa and low temperatures down to 77 K in a Bridgman anvil system. It is found that all the GaxTe100-x, glasses exhibit metallization unde…
Positive photosensitive polyimides with cyclobutane structure
Abstract A new family of positive photosensitive polyimide (PPI) systems composed of solvent soluble polyimides (Pls) with cyclobutane (CBDA) structures and diazonaphthoquinone compounds (DNQ) has been prepared. Heat and catalytic imidizations were carried out to obtain CBDA Pls; the former was better than the latter…
Nonlinear optical properties of polymers and thin polymer films
Abstract An introduction to nonlinear optics (NLO) and the major challenges in the field of NLO‐properties of polymeric materials, is given in this paper. Methods for the investigation of nonlinear optical properties of [4‐(2‐methacryloxyethyl)methylamino]‐4′‐cyanoazobenzene copolymers with methyl methacrylate (MMA) a…
<title>Large-aperture, high-efficiency holographic gratings for high-power laser systems</title>
An inherently fringe stable interferometer, with uniform recording-plane exposure, produces transmission gratings with uniformly high efficiency. The surface-relief structures recorded in positive photoresist are ideal for their transfer into specialized candidate materials. These structures have many applications in…
Frequency Dependence of Permeability in Fe-Zr-N Film
The effects of the thickness, uniaxial anisotropy field, electrical resistivity and addition of other elements on the frequency dependence of permeability in Fe-Zr-N films were investigated. Film thicknesses were varied up to 8 μm. The purpose of this study was to identify the main origin of the high-frequency loss in…
Polytetrafluoroethylene fiber-based composite antifriction coatings
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolytetrafluoroethylene fiber-based composite antifriction coatingsAlexander S. KuzharovCite this: Ind. Eng. Chem. Res. 1993, 32, 5, 763–773Publication Date (Print):May 1, 1993Publication History Published online1 May 2002Published inissue 1 May 1993https://pubs.acs.org/doi/…
Development and commercialization of ionic‐type photosensitive polyimides
Abstract Toray's ionic‐type photosensitive polyimide, “Photoneece”, is widely used as an interdielectric and as a protection layer for microelectronics, because of its properties, such as the removal of photoreactive groups at low temperature, excellent thermal, mechanical and electrical film properties and excellent…
Absorbed-Dose Buildup Factors in Air for 10- to 100-MeV Photons
Buildup factors are reported for the absorbed dose in air resulting from point isotropic sources of monoenergetic photons with energies from 10 to 100 MeV. Factors were calculated from photon fluences computed by the EGS4 code for coupled photon and electron transport. Comparisons are made with results of moments meth…
EXTRACELLULAR STRUCTURES PRODUCED BY MARINE SPECIES OFMASTOGLOIA
Diatom taxa of the genus Mastogloia collected near Lee Stocking Island, Bahamas and in Shark Bay, Australia were observed to produce extracellular structures. The shape, arrangement, and number of these structures is species-specific and related to the number of partecta. Structures observed in 20 Mastogloia taxa incl…
Vapour permeability: Suitability and consistency of current test procedures
The avoidance of condensation problems in the future depends on designers having available accurate and reliable vapour permeability values. The emergence of free trade within the European Community requires the transferability of measurement data between countries, as well as between individual laboratories. This pap…
Phase transitions of sulfur at high pressure: Influence of temperature and pressure environment
Phase transitions of orthorhombic sulfur were investigated above 10 GPa by Raman spectroscopy using red light excitation. Transitions into several phases that have been reported in previous studies using green light excitation, are confirmed. The phase behaviour is observed to depend strongly on the preparation method…
UV IRRADIATION OF NUCLEIC ACIDS: CHARACTERIZATION OF PHOTOPRODUCTS OF THYMIDYLYL‐(3′→5′)‐2′‐DEOXY‐5‐FLUOROURIDINE
The acetone-sensitized irradiation using UV-B (ultraviolet light, 280-320 nm; sunlamps) of thymidylyl(3'-->5')deoxyfluorouridine monophosphate produces two main photoproducts. The distribution of these photoproducts is dependent on the pH of the irradiation solution. At pH 6, the cis-syn cyclobutane-type photodimer is…
Craspedopleura (Bacillariophyta), a new diatom genus of arctic sea ice assemblages
Sea ice algal assemblages in the arctic region are mainly represented by marine diatoms (Bacillariophyta), dominated by species of Navicula Bory, Pinnularia Ehrenberg, Gyrosigma Hassall and Pleurosigma W. Smith. The examination of historical and modern ice diatom collections reveals that Navicula kryophila, first desc…
THIN ALUMINA AND SILICA FILMS BY CHEMICAL VAPOR DEPOSITION (CVD)
Alumina and silica coatings have been deposited by MOCVD (Metal Organic Chemical Vapor Deposition) on alloys to protect them against high temperature corrosion. Aluminium Tri-lsopropoxide (ATI) and DiAcetoxyDitertiaryButoxySilane (DAOBS) have been used as metal organic precursors to prepare these ceramic coatings. The…
Bond-orientational correlation in liquids and glasses
The nature of atomic bond-orientational anisotropy and order in liquids and glasses is considered based upon recent molecular dynamics studies. A possibility of spin-glass-like freezing of the local bond-orientational order (BOO) parameter is demonstrated. A close relationship between the anelasticity of metallic glas…
Thermodynamic evaluation of Ti–W system
The thermodynamic properties of the Ti–W system have been assessed on the basis of the descriptions of pure Ti and W included in the Scientific Group Thermodata Europe database. The assessment method involves the use of models for the Gibbs energy of the various phases of the system, and interaction parameters in the…
Magnetism in Rare-Earth-Transition Metal Systems. Magnetization Reversal and Ultra-High Susceptibility in Sandwiched Thin Films Based on Rare-earth and Cobalt Alloys
This paper is composed of two parts: theoretical and experimental. The theoretical part is divided into several sections. The main characteristic properties of 3d (transition metals) and 4f (rare-earth metals) magnetism are explained in the second section. The properties of rare-earth-transition metal compounds are di…
Infra‐red microspectroscopy as a complementary technique to electron‐probe microanalysis for the investigation of natural corrosion on potash glasses
Summary Natural corrosion crusts on potash—lime—silica glasses, that have been buried in soil for very long periods, were examined using infra‐red reflectance microspectroscopy and electron‐probe techniques. Individually these techniques are useful: infra‐red provides information on which functional groups are present…