Materials Literature
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The slow dynamics (10 −6 s–10 4 s) of the magnetization in the paramagnetic phase, predicted by Glauber for the 1d Ising model, has been observed with ac susceptibility and SQUID magnetometry measurements in a molecular chain comprising alternating Co 2+ spins and organic radical spins strongly antiferromagnetically c…
Dynamics in the production of extracellular polymeric substances (EPS) were investigated for the benthic diatoms Cylindrotheca closterium (Ehrenberg) and Nitzschia sp. The effect of growth phase and light:dark conditions were examined using axenic cultures. Two EPS fractions were distinguished. Soluble EPS was recover…
The primary damage formation in Mo is investigated using molecular dynamics (MD) simulation with embedded-defect (ED) and embedded-atom method (EAM) interatomic potentials. The former is similar in spirit to the latter but includes an approximate treatment of bond directionality in the many-body interaction. MD simula…
This paper reports on a study of the transient optical absorption exhibited by Li 2 B 4 O 7 (LTB) in the visible and UV spectral regions. Using absorption optical spectroscopy with nanosecond time resolution, it is established that the transient optical absorption (TOA) in these crystals originates from optical transi…
The role of delocalization and hybridization in complex magnetic oxides has been investigated by magnetic oxygen K -edge absorption of circular polarized soft X-rays in epitaxial grown CrO 2 as a function of the azimuthal angle at grazing incidence. Unusual strong variations in the typically small X-ray magnetic circu…
In this paper, we present the results of a study on pure silica fibers where both the spectral and kinetic behavior are explored during irradiation in spent fuel gamma facilities. Basic kinetic models are considered, as they provide insight into fundamental dependencies on temperature and dose-rate. Other popular mode…
Foamed propellants based on polymer bonded nitramines show high conversion rates due to their porous structure. The properties of the material can be varied in a wide range by using different explosive fillers, energetic binders and porous structures. Foamed propellants with high energy content and variable burning an…
Infrared spectra of synthetic, semicrystalline aluminosilicates in the region 500–1200 cm −1 show a dominant band due to Si–O stretching at 980–1030 cm −1 and two combined bands due to Si–O–Al bending at 600–700 cm −1 . These bands can be used to determine quantitatively the Si/Al ratio of the aluminosilicates. A cali…
The dependence of the single bubble sonoluminescence (SBSL) on the waveforms of the driving ultrasound has been investigated by both experiment and numerical calculation. Three types of non-simple-harmonic waves, the rectangular, triangular and as well as the sinusoidal wave with a pulse, are used to drive the SBSL in…
Capacitance-voltage (C-V) measurements up to 800 VDC were made on a modified lead-zirconate (PbZrO/sub 3/) 20-layer multilayer ceramic (MLC) antiferroelectric power-electronic capacitor, with large energy-density storage capability. For these a precision impedance analyzer was used, in conjunction with a high-voltage…
Several organic spin systems based on 4-(N-alkyl)amino-TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidinyl-1-oxy) radicals were prepared in which cholesterol or biphenyl mesogenic cores with long alkyl or alkoxy substituents were incorporated in order to investigate the possible occurrence of liquid crystalline properties.…
In a basic study to identify low-loss optics for applications in F2 lithography, five potential coating materials (AlF3, Na3AlF6, MgF2, LaF8, and GdF3) and three deposition methods (thermal evaporation by a resistance heater and by electron beam and ion-beam sputtering) were investigated in the vacuum ultraviolet (VUV…
Chemical routes for the synthesis of nanoparticles and films are proving to be highly efficient and versatile in tailoring the elemental combination and intrinsic properties of the target materials. The use of molecular compounds allows a controlled interaction of atoms or molecules, when compared to the solid-state m…
Mechanical alloying of Ti 45 Zr 38 Ni 17 powder mixture forms an amorphous phase, but subsequent annealing causes the formation of an icosahedral ( i ) phase. The maximum hydrogen concentration that can be loaded at 573K at a hydrogen pressure of 3.8MPa is the same (\[H]/\[M] 1.5) for the amorphous and i -phase powder…
A micromechanically based model for the deformation, strength, and stress‐rupture life of a ceramic‐matrix composite is developed for materials that do not degrade by oxidative attack. The rupture model for a unidirectional composite incorporates fiber‐strength statistics, fiber degradation with time at temperature an…
This article reports on the ecological preferences of benthic diatoms in relation to pH, conductivity and organic pollution-eutrophication and their tolerance spectrums. Three Pampean streams subjected to different human impacts were studied. The bottom substrate of these streams is mostly composed of slime-clay with…
Some properties of electron field emitters based on various types of carbon are difficult to measure and are not well known. This is particularly true for amorphous carbon films, for nanotubes and for nanotips grown by carbon contamination in a scanning electron microscope. We show that by combining together experimen…
Results of spin-polarized, gradient-corrected, periodic density functional theory calculations are reported for the dissociative adsorption of molecular oxygen over the oxide surface of La 2 O 3 (001). The diatomic surface oxygen species formed from O 2 dissociation are characterized structurally by a bent orientation…
This paper reports on the full electrochemical synthesis of electrically conducting polymers chemically grafted to conducting surfaces (e.g., glassy carbon, stainless steel, nickel, gold). It is based on new functional acrylate monomers, i.e., 3-(2-acryloyloxyethyl)thiophene and N -(2-acryloyloxyethyl)pyrrole, whose t…
Using STM, we have directly confirmed the incommensurate stacking of double atomic layers of graphene and monolayer h-BN on Ni(111). The formation of a graphene layer weakens the interfacial interaction between monolayer h-BN and Ni(111), resulting in insulating h-BN layers, while a pristine monolayer h-BN on Ni(111)…