Materials Literature
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This report discusses fourteen tests which were conducted to investigate the perforation of thin unreinforced concrete slabs. The 4340-steel projectile used in the test series is 50.8 mm in diameter, 355.6 mm in length, has a mass of 2.34 kg. and an ogive nose with caliber radius head of 3. The slabs, contained within…
Abstract Reduction of aldehydes and ketones with 2-propanol proceeded efficiently over silica-supported zirconium catalyst, and the corresponding alcohols were obtained in high yields. In the reduction of aldehyde, the acetalization did not occur and the side reaction, the aldol condensation, was inhibited.
The preparation of liquid-crystalline 2,5-bis(4-alkyloxyphenyl) thiazolo [5,4-d] dithiazoles (ATT n ), in which the alkyl group is C n H2n + 1 (where n = 1 to 10, 12), has been described. Mesomorphic properties and phase transitions as determined by polarizing hot stage microscopy and differential scanning calorimetry…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract Weathering of spodumene in a lateritized pegmatite in Western Australia was studied by investigating in situ samples by electron-beam techniques. The spodumene had mostly altered to smectite. However, some non-crystalline material adjacent to smectite and intermixed with smectite was also observed. No crystal…
Abstract— Large‐area (12 × 100 cm) flexible displays were successfully fabricated using ferroelectric liquid‐crystalline polymers (FLCPs). The polymers were comb‐shaped and had side chains which consisted of a flexible spacer unit, a rigid core moiety, and an optically active end‐group. These displays are lightweight…
Amorphous Al 2 O 3 –ZrO 2 composite powders with 5–30 mol% ZrO 2 have been prepared by adding aqueous ammonia to the mixed solution of aqueous aluminum sulfate and zirconium alkoxide containing 2‐propanol. Simultaneous crystallization of γ‐Al 2 O 3 and t ‐ZrO 2 occurs at 870°–980°C. The γ‐Al 2 O 3 transforms to α‐Al 2…
Abstract The unwanted scattering of electrons in electron spectrometers leads to a loss of sensitivity, distortion of the spectral background and problems in calibrating spectrometer intensity/energy transmission functions. Here we develop three methods to analyse the extent of the contribution and how to reduce it to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGrowth of electropolymerized polyaniline thin filmsA. Guiseppi-Elie, S. R. Pradhan, A. M. Wilson, D. L. Allara, P. Zhang, R. W. Collins, and Y. T. KimCite this: Chem. Mater. 1993, 5, 10, 1474–1480Publication Date (Print):October 1, 1993Publication History Published online1 M…
A comparision between the measured dielectric spectra of a compound exhibiting ferroelectric Sm C*, antiferroelectric Sm CA* and the intermediate ferrielectric Sm Cγ* phase with a calculated spectra emerging from a phenomenological Landau type theory is presented.
Potassium titanium bronze K 1.0 Ti 8 O 16 and its chemically oxidized «exuviae» oxide K 0.0 Ti 8 O 16 crystallize in a tetragonal system, I4/m, with the hollandite-type one-dimensional tunnel structure. For K 1.0 Ti 8 O 16 , M r =678.13, a=10.1776 (5), c=2.9614 (2) A, V=306.75 (3) A 3 , Z=1, D x =3.67 Mg m -3 , λ(Mo K…
We consider the shape of a slowly growing single crystal, which in equilibrium contains both facets and rounded regions. In a restricted regime of growth drive, a simple modification of the surface-free-energy minimization relevant to equilibrium reproduces experimentally observed behavior during growth and evaporatio…
A study was conducted to investigate the relationship between the thermo-oxidative stability of PMR-15 matrix resin and the stability of graphite-fiber-reinforced composites that contain this resin as the matrix material. Three areas were investigated. The first was the effect of fiber/matrix interfacial bond strength…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, magnetism, and electrical properties of lanthanum barium titanate (La1-xBaxTiO3) (0.0 .ltoreq. x .ltoreq. 0.5)Joseph E. Sunstrom, IV and Susan M. KauzlarichCite this: Chem. Mater. 1993, 5, 10, 1539–1544Publication Date (Print):October 1, 1993Publication History Pu…
Four kinds of BN powders—amorphous BN with B 2 O 3 , partially crystallized BN without B 2 O 3 , well‐crystallized hBN with B 2 O 3 , and well‐crystallized hBN without B 2 O 3 —were prepared to determine the effect of B 2 O 3 on the crystallization of amorphous BN and the effect of BN crystallinity on the formation of…
Electron-lattice interactions in nonmetallic materials are reexamined in the many-electron scheme. The difference in the stable atomic configuration between two electronic states is the origin of the electron-lattice interaction. We show the relationship among the adiabatic potentials, one electron (hole) energy and t…
A study of the mechanical properties of basic warp-knitted, fabric-rein forced composites is presented. Three basic knitted structures have been adopted. It is found that knitted structures greatly affect the in-plane anisotropic nature, tensile strength, and modulus of warp-knitted, fabric-reinforced composites. The…
The electro-optic coefficients for the chromophore nitroamino tolane [NAT:HOCH2CH2-N(C2H5)-ϕ-C≡ C-ϕ-NO2] attached to either a poly(methyl methacrylate) or an epoxy polymer have been measured by three different techniques: attenuated total reflection, ellipsometric reflection, and Mach–Zehnder interferometry. All the r…
The objective of this study is to determine the effects of the location and concentration of synthetic absorbable yarn components in bicomponent vascular graft fabrics on their structure and properties in a controlled in vitro hydrolytic environment. Bicomponent vascular fabrics were made from Dacron and polyglycolic…
Summary Measurements of skin mechanics are required to understand better cracking and flaking of the epidermis and loss of 'elasticity'with age in the dermis. Improvements in torsional testing are described here. The resulting data was fitted to algebraic models, the parameters of which can serve both as a concise des…