Quantities for Dosimetry of Ionizing Radiations in Liquid Water
Quantities for Dosimetry of Ionizing Radiations in Liquid Water , Quantities for Dosimetry of Ionizing Radiations in Liquid Water , کتابخانه الکترونیک و دیجیتال - آذرسا
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Wide band gap materials for field emission devices
An analysis of wide band gap materials from the point of view of their application in cold emission devices is presented, and criteria of material choice for device application are discussed. Not only material but also technological parameters are taken into consideration. Among the material parameters, the following…
Evaluation by Fourier Transform Infrared Spectroscopy of the different crystalline forms in syndiotactic polystyrene samples
Fourier transform infrared (FTIR) spectra of syndiotactic polystyrene (s-PS) semicrystalline samples have been examined by using the spectral subtraction approach. For the crystalline forms including trans-planar chains (trigonal α and orthorhombic β) a number of conformational and structural order effects, not previo…
Surface-Enhanced Raman Spectra of Pyridine and Pyrazine Adsorbed on a Au(210) Single-Crystal Electrode
Surface-enhanced Raman scattering (SERS) spectra of pyrazine and pyridine adsorbed on an “unroughened” Au(210) electrode surface have been obtained for the first time. The SERS spectra indicate that both pyridine and pyrazine adsorb on the Au(210) electrode via their nitrogen lone pairs (end-on configuration). The int…
Synthesis of α-Carboxyl, ω-Amino Heterodifunctional Polystyrene and Its Intramolecular Cyclization
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of α-Carboxyl, ω-Amino Heterodifunctional Polystyrene and Its Intramolecular CyclizationMasataka Kubo, Takeshi Hayashi, Hidenori Kobayashi, Kae Tsuboi, and Takahito ItohView Author Information Department of Chemistry for M…
Crystal Structure at 2.0 Å Resolution of Phosphoribosyl Anthranilate Isomerase from the Hyperthermophile Thermotoga maritima: Possible Determinants of Protein Stability,
The structural basis of thermostability of proteins is of great scientific and biotechnological interest. Differences in the X-ray structues of orthologous proteins from hyperthermophilic and mesophilic organisms can indicate crucial stabilizing interactions. To this end the crystal structure of dimeric phosphoribosyl…
Single Process to Deposit Lead Zirconate Titanate (PZT) Thin Film by a Hydrothermal Method
The hydrothermal method to deposit lead zirconate titanate (PZT) thin film is a new method reported by Tsurumi et al. . in 1991. This method consists of two linked processes. We have found that the film deposited by the first process is not PZT but separated lead zirconate (PZ) and lead titanate (PT). In this paper, w…
Termination kinetics of free‐radical polymerization of styrene over an extended temperature and pressure range
Abstract The termination rate coefficient k t of the free radical bulk polymerization of styrene is determined between 30 and 90°C up to a maximum pressure of 2800 bar. The majority of polymerization experiments has been carried out at monomer conversions up to 20 per cent. In this range a single value of k t is suffi…
Diastereoselective Catalytic Epoxidation of Chiral Allylic Alcohols by the TS-1 and Ti-β Zeolites: Evidence for a Hydrogen-Bonded, Peroxy-Type Loaded Complex as Oxidizing Species
The similar diastereoselectivities as for peracids implicate a pentacoordinated metal peroxy species in the epoxidation of chiral allylic alcohols by the titanium-containing zeolites TS-1 and Ti-β. In the loaded complex, the allylic alcohol substrate is fixed through hydrogen bonding to the metal center, with A 1,3 st…
Constraints, metastability, and inherent structures in liquids
Void-size distributions have been calculated for the shifted-force Lennard-Jones fluid over substantial temperature and density ranges, both for the liquid-state configurations themselves, as well as for their inherent structures (local potential energy minima). The latter distribution is far more structured than the…
Characterization of metal clusters (Pd and Au) supported on various metal oxide surfaces (MgO and TiO2)
Au clusters supported on the TiO2(001)/Mo(100) surface and Pd clusters supported on the MgO(100)/Mo(100) surface have been studied using temperature programmed desorption, ion scattering spectroscopy, scanning tunneling microscopy, and scanning tunneling spectroscopy. Three dimensional growth has been observed at 300…
Chemical Strategies for Template Syntheses of Composite Micro- and Nanostructures
This paper describes chemical strategies, used in conjunction with the template method, for preparing composite micro- and nanostructures. An example is shown here. Each pore in the template membrane (A) is first filled with a tubule of Au (B). An electropolymerization method is then used to deposit a tubule of an ins…
Concentration dependence of the low-shear viscosity of suspensions of hard-sphere colloids
Experimental measurements are presented of the concentration dependence of the low-shear limit viscosity of nearly monodisperse polymethylmethacrylate spheres dispersed in cis-decalin, a system that models a suspension of hard spheres. The suspension volume fractions are calibrated with reference to the volume fractio…
Further Improvements in the Long-Range Order of MCM-41 Materials
Synthetic methods for making an all-silica MCM-41 mesoporous silicate of high long-range order are reported. The product shows up to seven orders of X-ray diffraction and good stability under calcination conditions. The greatest improvement in structure occurs when the pH is held between 9 and 10 during synthesis and…
Dendritic Bipyridine Ligands and Their Tris(Bipyridine)Ruthenium(II) Chelates—Syntheses, Absorption Spectra, and Photophysical Properties
Abstract Several synthetic strategies have been explored to prepare dendrimers having the [Ru(bpy) 3 ] 2+ complex as their core (bpy = 2,2′‐bipyridine). Dendritic ligands have been synthesized by attaching branches in the 4,4′‐positions of bpy. The largest dendritic bipyridine ligand contains 54 peripherical methylest…
Reverse Micelle Based Formation of BaCO3 Nanowires
A reverse micelle based approach is reported for the synthesis of BaCO 3 nanowires with lengths up to 100 μm and diameters as small as 10−30 nm, each of which is a continuous single crystal with the c -axis along the wire length axis. The synthesis is achieved by the reaction of barium and carbonate ions solubilized i…
Stepped‐up reactivity of a simple lanthanoid initiator. Polymerization of methyl methacrylate initiated with a lanthanoid alkoxide – ketene system
Abstract Polymerization of MMA is achieved by using a novel initiator, most probably the lanthanum enolate growing species formed in the polymeritation of ketene with La(O i Pr) 3 . The design of this simple initiator is based on the stimulation of the reactivity of La(O i Pr) 3 , which by itself is inactive, upon the…
Accelerated thermal aging of NBR and other materials under air or oxygen pressures
Abstract Accelerated thermal degradation of nitrile‐butadiene rubber, ethylene‐propylene rubber, low density polyethylene and glass reinforced epoxy resin was studied (a) in air, at atmospheric pressure, and various temperatures and (b) in air or oxygen at various pressures ( P > 1 atm) and temperatures. On the bas…
Biodegradation of estolides from monounsaturated fatty acids
Abstract Mono‐ and polyestolides, made from oleic acid, meadowfoam oil fatty acids and erucic acid, were subjected to biodegradation with mixed cultures of Penicillium verucosum, Mucor racemosus , and Enterobacter aerogenes . Fermentations were continued for 3, 5, 10, 15, 20, or 30 d. Meadowfoam oil and its fatty acid…
Effects of flow induced orientation of ferromagnetic particles on relative magnetic permeability of injection molded composites
Abstract Composite samples consisting of ferromagnetic asymmetric particles incorporated into a polyolefin binder were injection molded using custom designed molds which produced preferential fiber orientations. The relative magnetic permeability values of the composites were measured as a function of the filler volum…