Electron diffraction study on the two crystalline phases occurring in native cellulose from an algal cell wall
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Alternating current susceptibility, high field magnetization, and millimeter band EPR evidence for a ground S = 10 state in [Mn12O12(Ch3COO)16(H2O)4].2CH3COOH.4H2O
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A mechanism of magnetic hysteresis in heterogeneous alloys
It is suggested that in many ferromagnetic materials there may occur particles distinct in magnetic character from the general matrix, and below the critical size, depending on shape, for which domain boundary formation is energetically possible. For such single-domain particles, change of magnetization can take place…
Theoretical x-ray absorption fine structure standards
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical x-ray absorption fine structure standardsJ. J. Rehr, J. Mustre de Leon, S. I. Zabinsky, and R. C. AlbersCite this: J. Am. Chem. Soc. 1991, 113, 14, 5135–5140Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 Jul…
The exchange-spring magnet: a new material principle for permanent magnets
It is proposed that permanent magnets can be made of composite materials consisting of two suitably dispersed ferromagnetic and mutually exchange-coupled phases, one of which is hard magnetic in order to provide a high coercive field, while the other may be soft magnetic, just providing a high saturation J/sub s/, and…
Accurate bond and angle parameters for X-ray protein structure refinement
Bond-length and bond-angle parameters are derived from a statistical survey of X-ray structures of small compounds from the Cambridge Structural Database. The side chains of the common amino acids and the polypeptide backbone were represented by appropriate chemical fragments taken from the Database. Average bond leng…
Sensitization of neodymium ion luminescence by divalent tin
Sensitization of the Nd 3+ ion luminescence by Sn (II) oxygen complexes in glasses was observed and investigated. It was established that excitation was transferred to the rare-earth activator from singlet and triplet states of the sensitizer and the maximum efficiency of this process was achieved at low sensitizer co…
Localization and Its Absence: A New Metallic State for Conducting Polymers
A widely held view in solid-state physics is that disorder precludes the presence of long-range transport in one dimension. A series of models has been recently proposed that do not conform to this view. The primary model is the random dimer model, in which the site energies for pairs of lattice sites along a linear c…
ChemInform Abstract: Raman Studies of Corrosion Films Grown on Fe and Fe‐6Mo in Pitting Conditions.
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
The ferroelectric phase transition in pure and lightly doped barium titanate
The effect of light doping on the phase transition to the ferroelectric state in BaTiO 3 has been studied using synchrotron radiation at Daresbury Laboratory, UK. The results indicate that the presence of dilute impurities, which turn BaTiO 3 from a wide band-gap intrinsic semiconductor into an extrinsic n-type semico…
Electrochirally controlled bistable surface switching in nematic liquid crystals
We present an electrically controlled bistable surface switching for nematic liquid crystals, in cells with the usual display geometry. The surface bistability is controlled by means of an electrochiral effect, by doping a nematic with chiral ions. The alternate transient commutation between the two surface states is…
Ferroelectric properties of lead-zirconate-titanate films prepared by laser ablation
Ferroelectric lead-zirconate-titanate (PZT) thin films have been deposited by excimer laser ablation on sapphire substrates with and without an electrode. In preparation for the films, O2 gas pressure has greatly influenced the film structure and morphology. For the first time, we have confirmed the ferroelectric prop…
Vinylic graft copolymers of cellulose. II. Thermal degradation of cellulose and its vinylic copolymers and blends by differential scanning calorimetry
Abstract Cotton cellulose with different % NaOH treatments (mercerized), graft copolymers of cellulose prepared with vinyl acetate (VA) and methyl acrylate (MA) and Ce (IV) ions as initiator, and some blends of cellulose–copolymer PVA–PMA were submitted to differential scanning calorimetry (DSC) analysis in nitrogen a…
Static scattering in filled nematic: new liquid crystal display technique
A new bistable liquid crystal display is described that uses a nematic phase in which solid particles are dispersed. The display effects rely on direct static light scattering so that no polarisers are required. A two-frequency addressing scheme provides, in principle, a method for electrical control.
1.9-.ANG. Structures of ternary complexes of citrate synthase with D- and L-malate: mechanistic implications
The structures of four isomorphous crystals of ternary complexes of chicken heart citrate synthase with D- or L-malate and acetyl coenzyme A or carboxymethyl coenzyme A have been determined by X-ray crystallography and fully refined at 1.9-A resolution. The structures show that both L-malate and D-malate bind in a ver…
Weak pinning and hexatic order in a doped two-dimensional charge-density-wave system
Scanning tunneling microscopy has been used to characterize the effects of Nm impurities on the incommensurate charge-density-wave (CDW) phase in 1T-${\mathrm{TaS}}_{2}$. Real- and reciprocal-space data indicate that disorder in the CDW is due to dislocations and small random rotations of the CDW. The dislocations des…
Growth inhibition of lysozyme crystals at high hydrostatic pressure
The influence of high hydrostatic pressures on the crystallization of hen egg-white lysozyme has been determined by growing lysozyme crystals with a capillary technique adapted to high pressure conditions and monitoring the residual protein concentration remaining in the supernatant. Pressure is found to reduce the ra…
Static structure factors of binary suspensions of charged polystyrene spheres: experiment against theory and computer simulation
The microscopic static structure of dilute binary colloidal suspensions, for compositions covering the full molar fraction range, are investigated using static light scattering experiments. The mixtures of liquid-like ordered suspensions are made from charged polystyrene particles having averaged radii of 42 nm and 65…
Microstructure of erbium-implanted Si
A study is presented of the relation between microstructure and 1.54 μm photoluminescence (PL) in high-energy ion-implantated Er in Si as a function of implant dose, energy, and temperature and subsequent anneal. Transmission electron microscopy (TEM) of material implanted at 500 keV and ≳100 °C and annealed at 900 °C…
Universal elastic scattering cross sections for electrons in the range 1–100 keV
For high atomic numbers the total cross section for electron-atom elastic scattering calculated using the partial-wave method is found to fall into two regimes over the range 1–100 keV. The cross section in the higher energy regime scales as E−1, and in the lower energy regime as E−0.5. An empirical equation has been…