Materials Literature
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Abstract The compound Mg 2+ -Al 3+ -(Fe(CN) 6 ) 4− , with a structure similar to hydrotalcite Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O, is prepared by a coprecipitation method. Chemical, thermal, and X-ray analysis of the compound lead to the formula: <mml:math xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mnf="http://cambri…
Probenecid induced major alterations in the half‐life. renal clearance, and metabolism of naproxen. In 6 healthy subjects who received 500‐mg single oral doses of naproxen alone and (following two days of probenecid loading) with 500 mg of probenecid 4 times a day, there was an increase in naproxen plasma half‐life fr…
The 10-nm filaments of baby hamster kidney (BHK-21) cells, when examined either in the form of native filament caps or polymerized in vitro, are long tubes of protein 8--10 nm in diameter. They contain about 42% alpha-helix, which, on the basis of x-ray diffraction data, is arranged in a coiled-coil conformation chara…
ABSTRACT Edaphic diatoms were collected on a seasonal basis from beneath five monospecific stands of spermatophytes on Graveline Bay Marsh (Mississippi) from 14 October 1976 through 21 June 1977. Of the 119 diatom taxa encountered. only seven were restricted to a single edaphic habitat, and five of these accounted for…
Abstract The variations in surface area of a sepiolite (Toledo, Spain) after acid and heat treatments (1 n to 5 n , HNO 3 , 110°C to 900°C for 100 h) have been studied. Surface areas have been determined from N 2 adsorption isotherms at 77 K using B.E.T., Langmuir and Dubinin-Radushkevich equations. S BET values range…
In the Van der Waals theory of liquids, very short-ranged intermolecular repulsions are approximated by hard-particle exclusions and somewhat longer-ranged intermolecular attractions are subject to a self-consistent mean-field treatment. This approach, which has recently been applied to pure nematogens, is here extend…
Ein neues, einfaches und schnelles Verfahren, das auf der Methode der Ausschluß-Chromatographie beruht, ermöglicht bei Festkörpern wie Silicagelen die Bestimmung des Porenvolumens, der spezifischen Oberfläche, des Volumens der geschlossenen Poren sowie der Porendurchmesser-Verteilung für Porendurchmesser zwischen 10 Å…
The depolarization ratios of the Raman vibrational bands from the terminal C≡N and the central C–C biphenyl link of an oriented nematic liquid crystal [p-n-pentyl-p′-cyanobiphenyl (5CB)] have been measured. The orientational order parameters 〈P2〉 and 〈P4〉 were calculated. The parameter 〈P4〉 remained far less than the…
Certain properties of vacuum-deposited thin films of a-Se were measured and compared with those of melt-quenched Se glass. After annealing in the temperature range 25–50 °C, the creep, heat capacities, and far-infrared behaviors of the vapor-deposited films were indistinguishable from those of melt-quenched specimens.…
Abstract In gamma-ray logging for radioactive source material, the logging system response depends on a variety of internal and external influences, such as the type of material, disequilibrium, source geometry, logging medium, and system components. Of paramount importance is the constant of proportionality that rela…
ABSTRACT Thirteen genera of algae were collected and identified from 110 swimming pools in the metropolitan area of Phoenix, Arizona. They included seven cyanophytes (Calothrix, Lyngbya, Oscillatoria, Nostoc, Phormidium, Plectonema, Pleurocapsa), four chlorophytes (Chlamydomonas, Diogenes, Oocystis, Roya), and two chr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal tetrathiolenes. 3. Structural study of the first bimetallic tetrathiolene complex, tetrakis(triphenylphosphine)diplatinum tetrathionapthalene, (Ph3P)4Pt2(C10H4S4) revealing an unexpected molecular distortionBoon-Keng Teo and P. A. Snyder-RobinsonCite this: Inorg. Chem.…
It has been demonstrated that the natural atmospheric corrosion behavior of low alloy steels in marine environments can be accurately described by an equation of the form: ∆W = KtN. With this relationship, reliable predictions of long term weight losses can be made from as few as two sets of determinations obtained in…
Abstract The polymers of lithium, sodium, potassium, and caesium salts of methacrylic acid have been prepared by free radical polymerization of the respective monomers in methanol solution. The degradation behavior of the polymers has been investigated by thermal volatilization analysis, thermogravimetry, and product…
Abstract A technique suitable for computer application has been developed whereby whole rock major element analyses are corrected for X-ray detectable nonclay minerals and used to set up simultaneous equations which are solved to give clay mineral abundances. A theoretical evaluation of the approach by graphical metho…
Gas-gun impact techniques have been used to pulse charge nanofarad capacitors from the shock depoling of PZT 56/44 and PZT 95/5 ferroelectric ceramics. The PZT materials were depoled in the normal mode. Pulse powers of hundreds of kilowatts were produced in a few microseconds. The PZT 56/44 material was impacted in th…
The characteristic pitting potentials of Ti and Ti6Al4V were determined by measurement of potentiodynamic current-potential curves in solutions of 1N NaCl, 1N Nal, and 1N NaBr. Under the same conditions current-time curves were measured for various potentials after generation of a new metallic surface. By means of the…
Air travel is becoming increasingly more accessible to people both\nthrough the availability of low cost flights. Health problems may arise due to anxiety\nand unfamiliarity with airport departure procedures prior to flying, whilst\nduring the air travel, problems may arise as a result of the food served on board,\ndi…
Abstract Besides the well-known argyrodite (Ag 8 GeS 6 ), the new compound Ag 2 GeS 3 could be synthesized from Ag 2 S-GeS 2 mixtures. Ag 2 GeS 3 crystallizes in an orthorhombic variant of the Wurtzite structure. Treatment of Ag 2 GeS 3 in a AgI/AgCl-eutectic yields the quaternary compound Ag 7 GeS 5 I. Crystal data f…
Heating experiments on natural omphacite at 15 to 18 kbar, using a piston-cylinder solid-media apparatus, have established the critical temperature for the order-disorder P2/n = C2/c transition at 725 plus or minus 20 degrees C. The disordering reaction P2/n-C2/c is quite abrupt, and the observed transformation temper…