Materials Literature
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Projectile impact generates severe fragmentation in ceramics which propagates at high velocities and precedes the penetration of the projectile. The high‐speed photographic technique of the Edge‐On Impact (EOI) has been developed at the Ernst‐Mach‐Institute (EMI) in order to visualize dynamic fracture in brittle mater…
Phosphoenolpyruvate carboxykinase (PCK), which catalyzes the nucleotide-dependent, reversible decarboxylation of oxaloacetate to yield phosphoenolpyruvate and CO2, is one of the important enzymes in the interconversion between C3 and C4 metabolites. This study focused on the first characterization of the enzymatic pro…
Abstract The present study describes the preparation of low‐substituted hydroxypropyl (HP) starches and investigation of their suitability for the development of flexible, highly transparent cast films. Changes in molecular composition due to processing conditions were identified by determining molar mass distribution…
It is empirically known that an armor ceramic should be as hard or harder than the projectile it intends to defeat. Quasi‐static indentation testing is one of the most widely utilized techniques for determining the hardness of armor ceramics. Hardness measurements can also be used to generate other property values tha…
A multi-walled carbon nanotube/polypyrrole (CNT/PPy) nanocomposite with cable-like morphology has been synthesized using an in situ chemical oxidative polymerization method. The temperature dependences of the conductivity and magnetoresistance (MR) have been studied. We found that the room temperature conductivity inc…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Cell culture in a biomimetic environment is known to improve the mechanical endurance of tissue-engineered cardiovascular components. Our goal was to generate a bioreactor that can reproduce a wide range of pulsatile flows with a completely physiological pressure profile. The morphology and biochemical properties of t…
Experiments simulating loss-of-coolant accident (LOCA) conditions were performed to evaluate the effect of pre-hydriding on the thermal-shock resistance of oxidized Zircaloy-4 cladding. Test rods fabricated with 580-mm long claddings were isothermally oxidized at temperatures ranging from 1,220 to 1,530 K in steam and…
The films of ZnO–SnO2 system were deposited on glass substrates by simultaneous dc magnetron sputtering apparatus, in which ZnO and SnO2:Sb (Sb2O5 3 wt % doped) targets faced each other. The substrate temperatures were maintained at 150, 250, and 350 °C, respectively. As an experimental parameter, current ratio δ=IZn/…
We review recent theoretical studies aimed at understanding gas/surface and gas-phase collisions at hyperthermal energies. The review is restricted to interactions between neutral species, and particular attention is given to the interactions of hyperthermal ground-state atomic oxygen (O(3P)) with hydrocarbons. Quantu…
A single‐phase material (HfMg)(WO 4 ) 3 with an orthorhombic structure, A 2 (WO 4 ) 3 ‐type tungstate, has been successfully prepared for the first time by the calcination of HfO 2 , MgO, and WO 3 , substituting Hf 4+ and Mg 2+ for A 3+ cations in A 2 (WO 4 ) 3 . The new material shows a negative thermal expansion coe…
Abstract A micropolar elastoplastic model for soils is formulated and a series of finite element analyses are employed to demonstrate the use of a micropolar continuum in overcoming the numerical difficulties encountered in application of finite element method in standard Cauchy–Boltzmann continuum. Three examples of…
A highly loaded ZnS nanoparticle (NP) array within mesoporous channels was prepared by repetitive insertion of ZnS reverse micelles. Contrary to the ZnS NPs in the water pool of reverse micelles exhibiting blue emission, the ZnS NPs incorporated within the organically functionalized mesoporous channels showed the emis…
The penetration of ceramic armor by a kinetic energy penetrator is complex, involving a continual process of material damage, micro‐crack nucleation, growth and coalescence, and multiaxial failure, all under conditions of high loading rate and inertial confinement. It will be shown that at sufficiently high stress, wh…
Abstract In this short review an introduction to the phenomenon of protein adsorption will be given. Protein adsorption often plays the central role in a wide variety of processes occurring in medicine, biochemistry, biotechnology and daily life. The main types of interactions ruling protein adsorption are summarized…
The first titanium phosphate nanotubes with alternating interlayer spacings have been successfully prepared and characterized. The synthesis is accomplished in a reverse microemulsion formed in an amine extraction system. TEM data from samples made after different times of reaction suggest a scrolling-formation mechan…
Tailoring glass compositions can raise the viscosity of SiREAl oxynitride glasses. In the present study, viscosity data are obtained by determining the compressive creep response of bulk glasses in air. The findings reveal that increasing both the nitrogen‐to‐oxygen and the yttrium‐to‐aluminum ratios of the glasses sh…
Two‐ and three‐dimensional SiC r /SiC composites have been prepared starting from Tyranno SA(tm) fiber preforms. Preform densification has been performed by a modified preceramic polymer impregnation and pyrolysis (PIP) process consisting of filling the preform large interbundle voids with SiC powder before the PIP pr…
Two compositions of the Y 2 O 3 –MgO (YM) and Yb 2 O 3 –MgO (YbM) systems were chosen to study the effect of the sintering additive composition on the processing and thermal conductivity of sintered reaction‐bonded silicon nitride (SRBSN). The nitridation, postdensification, microstructural evolution, and thermal cond…
Raman spectroscopy has been applied to the study of basic Cu sulfates including antlerite, brochiantite, posnjakite, langite, and wroewolfeite and selected complex Cu sulfate minerals. Published X-ray diffraction data were used to estimate possible hydrogen bond distances for the basic Cu sulfate minerals. A Libowitzk…