Materials Literature
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The formation process of field induced smectic C* layer structures known as 'horizontal chevrons' has been investigated as a function of external parameters. Characteristic dimensions of field induced domains, as well as the dynamics of their formation process are reported for a variation of cell gap, applied electric…
Single crystals of the uniform n-alkane C294H590 were grown from dilute solution in toluene in the temperature range 75°C to 85°C; the subsequent dissolution behavior during reheating was determined using calorimetry. Two crystal forms were recorded corresponding to once-and twice-folded chains. During isothermal crys…
Three novel triaromatic diepoxides, 1,4-phenylene bis(4-(2,3-epoxypropoxy)benzoate) (1), methyl-1,4-phenylene bis(4-(2,3-epoxypropoxy)benzoate) (2), and chloro-1,4-phenylene bis(4-(2,3-epoxypropoxy)benzoate) (3), were synthesized and their mesogenic properties studied. 1 and 2 were reacted with 4,4′-diaminobiphenyl (4…
La présente étude a permis de déterminer la flore diatomifère de quatre sources thermales situées au Canada (Îles de la Reine-Charlotte en Colombie Britannique et Takhini au Yukon), au sud-ouest de l'Islande et au Japon (mont Hakone). La composition en espèces des assemblages de chaque échantillon est décrite et appuy…
All articles of this category Treatment of unprotected pentitols and hexitols with RhH(PPh 3 ) 4 -benzalacetone system leads exclusively to glycono-1,4-lactones in 60-96% yield. unprotected itols - oxidation - T.C.H - RhH(PPh 3 ) 4 -benzalacetone - glyconolactones
States that computer simulations of seam pucker were executed. The simulations were based on the computer program which predicts the shape of virtual fabric with an assumption that the relationship between stress and strain of the virtual fabric is linear. The simulations predicted the shape of fabric with the conditi…
This paper reports the fabrication and evaluation of Mo/Al and Mo/Si multilayer films (MLs) for a wavelength of 18.5 nm. Calculated reflectivities of Mo/Al MLs at an incident angle of 10 degrees were about 7% higher than those of Mo/Si MLs. MLs were fabricated using an RF-magnetron sputtering deposition system. The me…
Deformation of a spunbonded nonwoven fabric specimen is extremely nonuniform during a uniaxial tensile test. Complex stress/strain fields are generated in the specimen due to the effect of the jaws, the nonlinear nature of deformation, and the low shear stiffness of the fabric, causing "necking" to take place in the u…
A collection of aerophilous diatoms from northern Madagascar was found to contain two taxa assignable to the modern concept of Orthoseira (but not in the sense of Thwaites). The morphological variability of the valve and cingulum of these two taxa is described and compared. The degree of valve silicification influence…
Dissolution characteristics for the photo-anodization of n-Si with three different doping levels (1015–1019 cm−3) are studied. Three regions are observed: porous layer formation, illumination-limited current plateau and electropolishing. The limiting current is determined by the illumination intensity and the effectiv…
Elastic differential, integral, and momentum-transfer cross sections are reported for electron scattering by ${\mathrm{C}}_{2}{\mathrm{H}}_{4}$ at impact energies ranging from 1 to 50 eV. The Schwinger iterative variational method in the fixed-nuclei, static-exchange plus correlation-polarization approximation is used…
Abstract Two novel liquid crystal display modes are proposed for wide viewing angle applications. One is named as “electrically‐induced optical compensation (EOC) mode”. It adopts the homeotropic alignment, positive dielectric liquid crystal as well as self domain divided method. The other is named as “Reverse Twisted…
A silicon micromechanical magnetometer was constructed and successfully used in 60-tesla pulsed magnetic fields of less than 100-millisecond duration. The device is small, inexpensive to fabricate, and easy to use. It features a fast mechanical response (up to 50,000 hertz) and extremely high sensitivity yet is relati…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT2-(4'-Nitrenophenyl)-4,4,5,5-tetramethyl-4,5-dihydro- 1H-imidazole-3-oxide-1-oxyl: Photogeneration of a Quartet State Organic Molecule with Both Localized and Delocalized SpinsPaul M. Lahti, Burak Esat, and Richard WaltonView Author Information Department of Chemistry,…
Localized axisymmetric inhomogeneous states with a continuous distribution of the director field can exist in nematics. Such structures are compressed into dense filaments under the influence of a magnetic or electric field. It is hypothesized that the given states can be achieved in filamentary nematic textures. This…
In the flexoelectrooptic (FEO) effect an electric field E, applied perpendicular to the helix axis of a short-pitch cholesteric makes the director turn an angle φ(E) and thereby the optic axis by the same amount. The director rotation is coupled to a periodic splay-bend director pattern (inverse flexoelectric effect)…
It is a well-known fact that the spectra of oxygen-rich circumstellar dust envelopes around evolved stars show great diversity, especially in the 10 μm silicate band profiles, but also in the longer infrared wavelength range covered by ISO. This supports earlier conclusions that the concept of a universal cosmic silic…
Temperature dependencies of magnetic properties were measured in barium-ferrite thin films with grains having in-plane aligned as well as randomly oriented easy axes. The temperature dependence of H/sub c/ was shown to be similar to that of the effective anisotropy field, which is determined by the crystalline and sha…
Real time dosimetry was used to analyze nuclear medicine technologist dose from performing positron emission tomography clinical imaging procedures. The purpose was to identify which tasks in the procedure were the greatest contributors to dose. Results identified the patient positioning task as the single largest sou…
The murein wall in Gram-negative bacteria is so thin that the mechanism of growth is necessarily complicated. From analytical data of murein components, Höltje suggested a model for the growth mechanism that would lead to safe wall enlargement. The model depended on the formation of trimers of peptidoglycan disacchari…