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Some novel nematic 4-cyanophenyl esters incorporating a lateral substituent
Ester derivatives of a novel phenol, 4-cyano-2-fluorophenol, have been prepared and found to exhibit wide-range nematic phases; many of these esters exhibit higher clearing points than those of the corresponding esters containing a hydrogen atom in place of the fluorine atom.
Biddulphioid Diatoms. II: The Morphology and Systematics of the Pseudocellate Species, Biddulphia biddulphiana (Smith) Boyer, B. alternans (Bailey) Van Heurck, and Trigonium arcticum (Brightwell) Cleve
Article Biddulphioid Diatoms. II: The Morphology and Systematics of the Pseudocellate Species, Biddulphia biddulphiana (Smith) Boyer, B. alternans (Bailey) Van Heurck, and Trigonium arcticum (Brightwell) Cleve was published on January 1, 1983 in the journal Botanica Marina (volume 26, issue 6).
Cation distribution in the complex oxide, W3Nb14O44; a time-of-flight neutron diffraction study
The cation distribution in W3Nb14O44, determined by time-of-flight, powder diffraction on a pulsed neutron source, is found to be consistent with the site potentials calculated using an electrostatic model.
A CHELATE RING SIZE EFFECT ON SPIN STATES OF IRON(III) COMPLEXES WITH HEXADENTATE LIGANDS DERIVED FROM SALICYLALDEHYDE AND 4,8-DIAZAUNDECANE-1,11-DIAMINE(3,3,3-tet) OR 4,7-DIAZADECANE-1,10-DIAMINE(3,2,3-tet), AND THEIR X-RAY STRUCTURES
Abstract High- and low-spin Fe(III) complexes with the titled ligands, [Fe(Sal23,3,3-tet)](NO3) (S=5/2) (1) and [Fe(Sal23,2,3-tet)](NO3) (S=1/2) (2), have been synthesized. X-ray analyses for 1 and 2 show that, in each complex, the metal environment is pseudo octahedral with the two O atoms being trans. Difference of…
End Products of Glucose Fermentation by Brochothrix thermosphacta
Anaerobically, Brochothrix thermosphacta fermented glucose primarily to l-lactate, acetate, formate, and ethanol. The ratio of these end products varied with growth conditions. Both the presence of acetate and formate and a pH below about 6 increased l-lactate production from glucose. Small amounts of butane-2,3-diol…
Diffusion in concentrated monodisperse colloidal solutions. The hard sphere—thermodynamic or hydrodynamic?
An empirical two-particle mobility tensor can be obtained by fitting the calculated mutual and local self-diffusion constants to available experimental data for hard-sphere-like dispersions. This mobility tensor, along with DLVO theory for the interparticle potentials, is used to calculate the mutual, local and long-t…
Synthesis and Properties of Thermotropic Compounds with Two Terminal Mesogenic Units and a Central Spacer (II). Homologous Series of $\alpha,\;\omega$-Bis (4-p-substituted phenoxycarbonyl)phenoxyalkanes
A series of new liquid crystalline compounds having two identical mesogenic terminal units, the 4-(p-nitrobenzoyloxy)phenoxy group, attached to both ends of a central polymethylene spacer of various lengths was prepared. The mesomorphic properties of the compounds were investigated by differential scanning calorimetry…
Tool and manufacturing engineers handbook : a reference book for manufacturing engineers, managers, and technicians
Tool and manufacturing engineers handbook: a reference book for manufacturing engineers, managers and technicians , Tool and manufacturing engineers handbook: a reference book for manufacturing engineers, managers an... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی
Density and Surface Tension of Binary Ferrite Melts
The density and the surface tension of Na2O-Fe2O3 and RO(R=Ca, Sr, Ba)-Fe2O3 melts have been measured to investigate the structure of these melts. Fe3+-ions may be amphoteric ions in these melts, that is, an oxygen 4 coordinated Fe3+ ion forms an oxygen complex anion such as SiO2 and an oxygen 6 coordinated Fe3+ ion a…
<I>In situ</I> Analysis of Passive and Transpassive Films on Nickel by Modulated UV-Visible Reflection Spectroscopy
Modulated reflection spectra have been measured on Ni at passive and transpassive potentials in 0.5 kmol·m−3 H2SO4 (pH 0.3), 1 kmo·m−3 Na2SO4 (pH 2.0–12.0), 0.1 kmol·m−3 NaOH (pH 13.1), and 1 kmol·m−3 NaOH (pH 13.7). By comparing the spectra with those of several reference Ni oxides and oxyhydroxides, constituent subs…
Dynamics of helical wormlike chains. III. Eigenvalue spectra and time-correlation functions
Some preliminary numerical results for the eigenvalue spectra and the time-correlation functions computed from the formulas derived in the preceding paper (paper II) are presented. First, it is claimed that certain conditions must be imposed on the translational and rotatory friction coefficients ζt and ζr of each of…
Testing of Materials
Tests on materials are necessary for many reasons, and the subject of materials testing is a very broad one. Some of the purposes for the testing of materials are: To determine the quality of a material. This may be one aspect of process control in a production plant. To determine such properties as strength, hardness…
Electrochemical and spectroscopic properties of manganese tetra(4-NN′N″-trimethylanilinium)porphyrin
The electrochemistry of the manganese(III)/manganese(II) tetra(4-NN′N″-trimethylanilinium)-porphyrin couple (abbreviated as MnIII/MnIITMAP) has been investigated in aqueous solutions in the entire pH range by means of cyclic voltammetry and thin-layer coulometry. The spectroscopic characteristics of the oxidized and r…
Nematic Droplets With a New Structure
We have found nematic droplets with a new structure, suspended in the isotropic phase of some mixtures of a nematogen with a nonmesomorphic compound. The molecules are oriented at an angle of ∼45° to the nematic-isotropic interface. This leads to an arrangement of the molecules in the droplets such that there are two…
Raman Study on the High Temperature Transition in V2O3
We have measured the Raman scatterings of V 2 O 3 and (V 0.985 Cr 0.015 ) 2 O 3 in the temperature range between 300 and 600 K. The Raman frequencies of A 1 g phonon modes in V 2 O 3 show some softening and recovery with a minimum at 480 K in the region of the high temperature transition. Those in (V 0.985 Cr 0.015 )…
Isotope effects in the multiphonon relaxation of hydrated and deuterated cesium chloromanganate (CsMnCl3·2H2O,·2D2O)
The electronic transition between the $^{4}T_{1}$ and $^{6}A_{1}$ states of the ${\mathrm{Mn}}^{2+}$ ion in CsMn${\mathrm{Cl}}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}2${\mathrm{H}}_{2}$O has been observed to be weak compared to the same transition in other hosts, due to vibrational quenching. We have observed f…
Homeotropic nematics heated from above under magnetic fields: convective thresholds and geometry
The thermal convective instability of a nematic layer aligned perpendicular to horizontal plates displays original characteristics, due to the coupling of the nematic distortion with the temperature gradient; in particular the adverse temperature gradient threshold Δ T c can be modified by the application of a vertica…
Relation between Graphitic Corrosion and Strength-degradation of Cast Iron Pipe
The corrosion behavior and the degradation of the gray cast-iron pipes, which had been buried for 22 to 79 years and used for natural water, have been investigated. The rate of the graphitic corrosion of pipes was in the range of 0.167 to 0.25mm/yr. The graphitization reduced the real wall thickness so that the streng…
Herstellung von Phenolharzen unter Verwendung von Stärkeprodukten
Abstract Bei der Herstellung von Phenolharzen vom Novolak‐ und Resol‐Typ wurde die Mitverwendung von Stärken und Stärkehydrolysaten untersucht; die Kohlenhydrate wurden hierbei in situ durch saure Katalyse zu 5‐Hydroxymethylfurfural (HMF) dehydratisiert, das in Gegenwart von Phenol und Formaldehyd in die Harze eingeba…