Materials Literature
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Random porous silicon dielectric multilayers are proposed as interesting materials for applications as optical components. Distributed Bragg reflectors and interferential Fabry - Pérot filters are demonstrated. The randomness is obtained as a variation in the layer thicknesses. The advantage in the use of random inste…
Abstract Surface barriers, designed to limit recharge and biointrusion, have been identified as a critical component in long‐term management of buried wastes. However, surface barrier technology remains largely unproven at the field scale. Recently, a prototype of a field‐scale (2.5 ha), vegetated, capillary surface b…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTStopped-Flow Photo-CIDNP Observation of Protein FoldingP. J. Hore, Stephen L. Winder, Claire H. Roberts, and Christopher M. DobsonView Author Information Oxford Centre for Molecular Sciences Physical and Theoretical Chemistry Laboratory and New Chemistry Laboratory, Un…
We have used magic‐angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy to examine the polyhedral arrangements in ternary lanthanum aluminoborate glasses. We have characterized two glass‐forming series: x Al 2 O 3 ·(1− x )LaB 3 O 6 and 0.25La 2 O 3 · y Al 2 O 3 (1− y )‐B 2 O 3 . 11 B MAS NMR reve…
Cellulose and its chemical analogs chitin and chitosan are abundant and technologically important fibrous polysaccharides. Cellulose and chitin are, respectively, the first [1] and second [2] most abundant natural polysaccharides. Chitosan, though less prevalent in nature, is a useful and easily accessible derivative…
ZrW2O8 has a negative coefficient of thermal expansion from 0.3 K to its decomposition temperature around 1050 K. The negative thermal expansion is isotropic and is not disrupted by the structural phase transition at 430 K. A complicated distribution in reciprocal space of Rigid Unit Mode (RUM) phonons has been found…
We have carried out a femtosecond transient absorption spectroscopic study on nickel(II) porphyrins in various solvents in order to obtain detailed information on vibrational relaxation processes occurring in the initial stage after photoexcitation to the highly excited states. We found the decay process of time const…
The interactions between molecules of a low molecular weight diblock copolymer of poly(ethylene oxide) (E) and poly(butylene oxide) (B), B 8 E 41, at hydrophobic surfaces were investigated experimentally by using two surface force techniques and ellipsometry. Extended mean-field theory was employed to describe the ads…
The Pt-catalyzed reduction of NO by propene exhibits strong electrochemical promotion by spillover Na supplied from a β‘‘-alumina solid electrolyte. In the promoted regime, rate increases by an order of magnitude are achievable. At sufficiently high loadings of Na the system exhibits poisoning, and excursions between…
A new approach for designing optically switchable molecular communication devices based on spin-exchange interactions is proposed in the present paper. The device is constituted from two parts, i.e., a paramagnetic block (PMB) and a coupling control block (CCB). As a prototype of this model, nickel nitroprusside, Ni[F…
Quantities for Dosimetry of Ionizing Radiations in Liquid Water , Quantities for Dosimetry of Ionizing Radiations in Liquid Water , کتابخانه الکترونیک و دیجیتال - آذرسا
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…
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 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…
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…
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…
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…
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…
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…
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…