Materials Literature
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Protective clothing against heat and flames should be evaluated not only for flame-rwistance but also for protection. against various heat exposures from convection, radiation, and conduction sources, depending on the end-use, to ensure a realistic assessment of the potential protection offered and required. Evaluatio…
Abstract A group of natural materials having anhydroglucose units linked by glycosidic bonds, as well as other related compounds, were irradiated with plasmas generated by a radio frequency field (13.56 MHz). Reactive sites created were characterized by electron spin resonance, chemiluminescence, infrared, and x‐ray p…
For certain occupations special clothing is worn t provide protection against heat and fire; the amount of protection needed varies widely with the specific occupation. Fabrics made from natural fibers have been traditionally used for ordinary protection such as that needed in routine work situations of foundary worke…
Acute animal experiments indicate that ventricular vulnerability to fibrillation or multiple premature contractions is greater during bipolar or anodal stimulation than with unipolar cathodal (with electrodes of equal cathodal and anodal surface area) because the anodal and bipolar absolute refractory periods are shor…
We report observations of magnetic, transport, and NMR properties in the charge-density-wave (CDW) states of V${\mathrm{Se}}_{2}$. Both the $^{51}\mathrm{V}$ Knight shift and the Hall constant are proportional to the intrinsic temperature-dependent magnetic susceptibility of V${\mathrm{Se}}_{2}$, with distinct breaks…
The systematics of the experimental data on neutron-resonance density is studied taking into account the effect of pair correlations and collective effects on the level density of excited nuclei. The consistency of the results of this analysis with the available experimental and theoretical information on the value of…
I The effects of a slow release form of tiflorex (TFX-SR, formerly known as flutiorex), a new anorectic drug. on subjective measures of hunger, arousal, and mood, and on objective measures of food intake, critical flicker fusion, pupil diameter, pulse rate and blood pressure, were observed in a two-phase placebo-contr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRevival of troponoid chemistryFrancesco PietraCite this: Acc. Chem. Res. 1979, 12, 4, 132–138Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1 April 1979https://pubs.acs.org/doi/10.1021/ar50136a004https://doi.org/10.1021/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDerivatives of heteropolyanions. 2. Metal-metal-bonded derivativesW. H. KnothCite this: J. Am. Chem. Soc. 1979, 101, 8, 2211–2213Publication Date (Print):April 1, 1979Publication History Published online1 May 2002Published inissue 1 April 1979https://pubs.acs.org/doi/10.1021…
In this paper we examine the stability of corona- and electron-beam-charged 25-μm FEP-A in open circuit by using thermally stimulated (TSC) measurements. We show that electrets charged with electron beams of 10 keV or higher are more stable than corona-charged foils. The inferior stability of corona-charged samples is…
Abstract The catalytic activity of metal porphyrins for the electroreduction of carbon dioxide was investigated by the measurements of current-potential curves on the Hg(Pt) electrode in aqueous electrolytic solutions. Metal-free, cobalt, iron and copper porphyrins(mesotetracarboxyphenylporphyrins, tetraphenylporphine…
The ability of Salmonella typhimurium to synthesize enterochelin (enterobactin; ENT) affects its capacity to grow both in vivo and in vitro. An ENT mutant (96-1), blocked in the conversion of chorismate to 2,3-dihydroxybenzoate, was derived from SR-11, a strain of high mouse virulence. This mutant was unchanged in the…
Abstract A new analysis has been made on studies of the influence of imino acid content on the changes of collagen thermal stability ( t m ). It is shown that, for the interstitial vertebrate collagens, there is a strict regularity in the changes of t m depending on hydroxyproline content. No correlation is observed b…
A theoretical study of domain walls in uniaxial displacive ferrodistortive systems is presented. We start from a generalized Langevin equation of motion for the movements of the ions, which includes dissipative terms and external fields, in addition to anharmonic and strain-force terms. We obtain large- and small-ampl…
The kinetics of the electrochromic process and the stability with different electrodes (evaporated film, electrodes obtained by anodic oxidation of W, polycrystalline, and single crystal) were studied. Cyclic voltammetry and chronoamperometry, together with optical absorption measurements in the electrochromic region…
Abstract A permanganic etchant has been developed which reveals lamellar and other fine detail in surfaces of at least three crystalline polyolefines, viz., polyethylene (of both high and low density), isotactic polypropylene, and isotactic poly(4‐methylpentene‐1). In typical treatments of high‐density polyethylene ca…
Isolated air crazes have been produced in thin films of polystyrene (PS) bonded to copper grids by straining these in tension. The craze thickness profile, r(x), was directly determined from a series of transmission electron micrographs taken along the craze. Local values of the craze fibril volume fraction v 1 and fi…
Abstract The crystal structure of a synthetic boehmite sample has been refined to an R of 0.047 in the space group Amam from X-ray powder diffraction data. Inclusion of hydrogen atoms and/or refinement in the space group A2 1 am gave poorer results. Cell dimensions were determined as a = 3.6936 (± 0.0003), b = 12.214…
We have grown and measured the optical second-harmonic coefficient dijk of the new nonlinear crystal 2-methyl-4-nitroaniline (MNA). We find that the dijk are very large with d12 being 5.8 times larger than d31 of LiNbO3 giving a birefringence phase-matching figure of merit d2/n3 which is 45 times larger than LiNbO3. T…
A theory is presented which quantitatively accounts for the important features of conduction in ZnO-based metal-oxide varistors. This theory has no adjustable parameters. Using the known values of the ZnO band gap, donor concentration n0, and low-voltage varistor leakage-current activation energy, we predict a varisto…