Algues d'eau douce de Porto Alegre, Brésil (les Diatomophycées exclues)
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Solubilities of the two ternary systems water + lithium bromide + lithium iodide and water + lithium chloride + lithium nitrate at various temperatures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of the two ternary systems water + lithium bromide + lithium iodide and water + lithium chloride + lithium nitrate at various temperaturesShigeki Iyoki, Shozo Iwasaki, Yutaka Kuriyama, and Tadashi UemuraCite this: J. Chem. Eng. Data 1993, 38, 3, 396–398Publicati…
Slow modes in crystals: A method to study elastic constants
We propose a microscopic expression for a displacement field in a crystal and derive nondissipative equations of motion for the slow hydrodynamic and broken-symmetry modes, including the vacancy-diffusion mode. Comparing these equations with the macroscopic ideal equations of elasticity we obtain exact expressions for…
The influence of rubber‐matrix interfaces on the crystallization kinetics of isotactic polypropylene blended with ethylene‐propylene‐diene terpolymer (EPDM)
Abstract Blends of isotactic polypropylene with amorphous and slightly crystalline ethylene‐propylene‐diene terpolymer (EPDM), prepared by solution blending, have been investigated by optical microscopy and differential scanning calorimetry. Nucleation and crystallization kinetic parameters, such as nucleation rates,…
New Photochemically Labile Protecting Group for Phosphates
Abstract New photochemically labile phosphate protecting group was developed. These phosphate esters have high molar extinction coefficient (ε340 = 34500 dm3 mol−1 cm−1) and rapidly release parent phosphates upon irradiation ( >300 nm) with high quantum efficiency for disappearance (φdis = 0.22 at 340 nm).
THE EFFECT OF TIME, TEMPERATURE AND PARTICLE SIZE ON SUBMICRON PARTICLE REMOVAL USING ULTRASONIC CLEANING
Ultrasonic cleaning is an established method for removing micron-size particles or larger from hard substrates. This paper presents the effect of the ultrasonic frequency and time functions on submicron particle removal effectiveness. The effect of the particle size, concentration and the cleaning liquid temperature i…
High velocity atomic oxygen/surface accommodation studies
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.
Evidence of Grain‐Boundary‐Sliding‐Induced Cavitation in Ceramics under Compression
Detailed microscopy of two crept aluminas, one with (AD99) and one without (Lucalox) a grain boundary glassy phase, has been performed to determine the pertinent damage mechanisms during creep. Evidence is presented for a nucleation‐controlled cavitation process where creep cavities nucleate primarily on two‐grain fac…
The SMART Wrist-Hand Orthosis (WHO) for Quadriplegic Patients
The SMART® Wrist-Hand Orthosis (WHO) is a new method of providing grasping function for quadriplegic patients. The use of shape memory alloy (SMA) actuators in rehabilitation technology (SMART) allows for a new type of actuator in addition to traditional actuators such as Bowden cables, pneumatic cylinders, electric m…
Tensile Fatigue Behavior of Staple Yarns
The failure of warp yarns on a loom is often caused by repeated cyclical elongation at small stresses well below the breaking point applied under static load. The phenom enon, commonly known as fatigue, is caused by the gradually diminishing resistance of the material, attributable to cumulative damage. Generally, the…
3D probabilistic modelling of equiaxed eutectic solidification
The equiaxed solidification of eutectic alloys is modelled by a probablistic method. The volume of the specimen is divided into a regular network of cubic cells and the temperature is assumed to be uniform. The temperature of the specimen is calculated in a time-stepping scheme from a simple heat balance and a knowled…
High-temperature kinetics of silicon atom oxidation by nitric oxide based on silicon, nitrogen, and oxygen atom measurements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature kinetics of silicon atom oxidation by nitric oxide based on silicon, nitrogen, and oxygen atom measurementsH. J. Mick, H. Matsui, and P. RothCite this: J. Phys. Chem. 1993, 97, 26, 6839–6842Publication Date (Print):July 1, 1993Publication History Published o…
Structure and bonding of pentaaquanitrosylchromium(2+) sulfate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and bonding of pentaaquanitrosylchromium(2+) sulfateMichael Ardon and Shmuel CohenCite this: Inorg. Chem. 1993, 32, 15, 3241–3243Publication Date (Print):July 1, 1993Publication History Published online1 May 2002Published inissue 1 July 1993https://pubs.acs.org/doi…
Broadening of the glass transition in blends of poly(aryl ether ketones) and a poly(ether imide) as studied by thermally stimulated currents
Abstract Blends of poly(aryl ether ketones) (PAEKs) and an amorphous poly(ether imide) (PEI) were used as model systems to study the broadening of the glass transition due to crystallization and the resulting depletion of PAEK from the amorphous phase. Two different PAEKs were studied, which are completely miscible wi…
The Sorption of 210Pb, 210Bi and 210Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides
Article The Sorption of 210Pb, 210Bi and 210Po on Montmorillonite: A Study with Emphasis on Reversibility Aspects and on the Effect of the Radioactive Decay of Adsorbed Nuclides was published on July 1, 1993 in the journal Radiochimica Acta (volume 62, issue 1-2).
Postcondensation and oxidation processes in molten polyamide 6
Abstract Polyamide samples were heated under vacuum or mixed in a Brabender plastograph. UV absorbance, chain end concentration, and molecular weight were studied. Postcondensation was observed for polyamide heated under vacuum. For polyamide samples mixed in the plastograph, atmosphere, shear rate, and temperature ch…
Indigo dyeing of cotton denim yarn: correlating theory with practice
The previously reported correlations in indigo dyeing of cotton denim between distribution of indigo in the cross‐section of denim yarn, colour yield and dyebath pH are reviewed. Statistical analysis reveals that even with the experimental uncertainty of the absolute p K a values associated with the ionisation of the…
Skeletal Isomerization of n-Butane Catalyzed by an Acidic Cesium Salt of 12-Tungstophosphoric Acid
Abstract A salt of H3PW12O40, Cs2.5H0.5PW12O40, catalyzed efficiently the skeletal isomerization of n-butane to isobutane at 300 °C. The activity and selectivity were much higher than those of SO22−/ZrO2. H-ZSM-5 was more active than Cs2.5H0.5PW12O40, but the selectivity was very low.
Solvent and polymer dynamics in concentrated polystyrene/toluene solutions
Depolarized Rayleigh scattering (DRS) and dielectric spectroscopy (DS) are employed to study the solvent and polymer dynamics in the polystyrene (PS)/toluene system and for PS concentration up to 0.6 g/ml. The DRS measurements were made in the temperature range from 255 to 373 K with different interferometers making p…
Effect of Y 2 O 3 Additions on the Densification of an Al 2 O 3 –TiC Composite
The densification of Al 2 O 3 –30TiC (in weight percent) composite is investigated as a function of Y 2 O 3 additions. It is observed that very small amounts of Y 2 O 3 are effective in aiding the densification. The density was observed to pass through a maximum at 0.35 wt% of Y 2 O 3 . The gas‐generating reaction of…