Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Photodegradable Polymers Having Biodegradability and Their Biodegradations and PhotolysisYoichi Hiraguri and Yutaka TokiwaView Author Information National Institute of Bioscience & Human-Technology, 1-1, Higashi, Tuskuba, Ibaraki 305, Japan Cite this: Macromolecule…
The internal stress effect on the temperature dependence of the dielectric and lattice constant in a Sm-doped BaTiO 3 ceramic was investigated using various particle sizes of starting barium titanate, pressure-dielectric spectroscopy and a high pressure X-ray diffractometer. The grain size was nearly proportional to t…
A research program was conducted at the St. Anthony Falls Laboratory to investigate impulse pressures caused by the collapse of transient cavitation bubbles. The impulsive pressures associated with vibratory as well as hydrodynamic cavitation were measured. Both a stationary specimen subjected to vibratory cavitation…
The radical copolymerization of N-(2,6-dimethylphenyl)maleimide (DMPhMI) and 2,4,4-trimethylpentene (TP) was investigated in several solvents at 60°C. The copolymerization rate and the molecular weight of the resulting copolymers were dependent on the kind of solvent used. It was also revealed that the monomer reactiv…
The mode I, mode II, and combined mode Imode II fracture behavior of ceria‐doped tetragonal zirconia polycrystalline (Ce‐TZP) ceramic was studied. The single‐edge‐precracked‐beam (SEPB) samples were fractured using the asymmetric four‐point‐bend geometry. The ratio of mode I to mode II loading was varied by varying th…
In this paper we explore the validity of the technologically important Manning relations which connect the phenomenological coefficients to the tracer diffusion coefficients in alloys. Derived originally for the random alloy, here the Manning relations are shown analytically to be equally valid for an isotropic binary…
Energetic stability of loop defects in nematic liquid crystal is analyzed using Mori-Nakanishi ansatz and Frank-Oseen theory with non-zero K 24 divergence term. The ratio of the bulk and divergence elastic constants defines a characteristic material length, which is the equilibrium radius a* of the disclination ring.…
The feasibility of evaluating thermodynamic interactions between polymer species by small-angle neutron scattering (SANS) measurements on ternary blends was investigated. Results were analyzed for two ternary systems of saturated hydrocarbon polymers by means of the multicomponent random phase approximation (RPA) as a…
Este trabalho analisa alguns aspectos da fotodegradação heterogênea do polipropileno (PP) e compósitos de PP com talco. Amostras moldadas por compressão e por injeção foram expostas à radiação ultravioleta em laboratório por períodos de até 48 semanas. Procedimentos sistemáticos de exposição e coleta de material para…
Abstract This study was carried out to investigate the feasibility of developing a continuous compounding process for wood‐fiber/thermoplastic composites using the Szego mill, a unique, high speed planetary ring‐roller grinding mill. Prior to compounding, air‐dried sawdust was ground to evaluate the grinding effect in…
We have successfully substituted 240 Pu 3+ for Ca 2+ in the calcium-binding protein calmodulin and used neutron resonance scattering from the bound 240 Pu to demonstrate that the Pu binds specifically to the Ca 2+ sites and also to measure the distance between the ion binding sites within individual domains of the pro…
This paper deals with ionising radiation effects (X or γ-rays) in ferroelectric materials for electronic non-volatile memories. After the recall of main observations, mechanisms are analysed and proposed to take into account the effects in PZT-based capacitors. Fatigue of the hysteresis cycle are studied and linked to…
Glass transition in supercooled Ga0.15Zn0.15Mg0.7 metallic liquid has been simulated by making use of a constant-pressure molecular dynamics technique via the pairwise interatomic potentials calculated from a self-consistent nonlocal model pseudopotential theory. The structures of liquids and glasses are analyzed thro…
Cobalt thin films were prepared by low-temperature atmospheric-pressure chemical vapor deposition from cobalt(II) acetylacetonate and cobalt(III) acetylacetonate. The resistivity was low ( 10–30 µ Ω·cm) and independent of film thickness, when the film thickness ranged from 150 to 700 nm. The thin films deposited from…
The first edition of Woolfson's An Introduction to X-ray Crystallography was published in 1970. It was a popular textbook for the senior undergraduate or graduate student beginning a serious study of x-ray crystallography. It was exactly what it claimed to be, a sound and uncompromising introduction for those intendin…
Several polypropene samples, synthesized with different catalytic systems based on TiCl4 supported on activated MgCl2 and different electron donors, were studied using both preparative and analytical temperature-rising elution fractionation (TREF). The experimental results show that each variation in the catalytic sys…
The fatigue crack growth resistance of α–β titanium alloys can be altered by microstructural modification. During welding, the fusion zone microstructure depends on cooling rate. In the present work, the alloy Ti-6Al-4V was welded over a range of heat inputs, using electron beam and gas tungsten arc welding. The weld…
The electronic states of indium oxide are calculated by a molecular orbital method. The conduction band consists mainly of oxygen 2 p and indium 5 p . The valence band consists of O-2 p . When there is an oxygen vacancy in the indium oxide, a localized orbital appears at the indium site near the oxygen vacancy, which…
The crystal structure of trans-diaquabis(methoxyacetato)copper(II), C(6)H(14)O(8)Cu, has been determined by neutron diffraction at 4.2 K (monoclinic, P2(1)/n, a = 6.88(1), b = 7.19(1), c = 9.77(2) Å, gamma = 95.7(1) degrees, (Z = 2)) and by X-ray diffraction at 125, 165, 205, 240, 265, 295, and 325 K. These measuremen…
An atomistic step of growth to a faulted loop, a stacking fault tetrahedron (sft) and a void by clustering of vacancies in fcc metals was studied by molecular dynamics computer simulation with an isotropic EAM potential due to Daw and Baskes [1]. In aluminum, a tri-vacancy relaxes to the Damask-Dienes-Weizer structure…