Local changes of solubility induced by electrolytes: salting-out and ionic hydration
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Ocular toxicity of beta-blockers and benzalkonium chloride in pigmented rabbits: electrophysiological and morphological studies.
Subconjunctival injection of 0.2 ml of the following solutions was carried out once a day for two weeks in the albino and pigmented rabbit: commercial 0.5% timolol or 1% befunolol ophthalmic solutions, both containing benzalkonium chloride, and also these drug solutions containing no preservative, ophthalmic base solu…
Studies on the constituents of Asclepiadaceae plants. LIX. The structures of five new glycosides from Dregea volubilis (L.) BENTH.
The glycosides of Dregea volubilis (L). BENTH. were further investigated. Five new glycosides named dregeosides H (1), Dp1 (2), Da1 (3), Gp1 (4), and Ga1 (5) were isolated and their structures were characterized on the basis of chemical and spectral evidence.
Fluorine and chlorine effects on radiation-induced loss for GeO2-doped silica optical fibers
Fluorine and chlorine effects on radiation-induced loss associated with the preexisting defects have been investigated. It is found that preexisting defects in fibers are closely related to radiation-induced loss. Fluorine and chlorine doping in GeO2-doped silica core optical fibers decreases GeO absorption at 0.24 μm…
Distribution Transformer No-Load Losses
This paper considers the subject of distribution transformers no-load losses and the factors that influence these losses. This paper reviews methods to correct errors in no-load loss measurement caused by excitation voltage distortion and temperature. These methods depend on the ability to separate no-load losses into…
Bestimmung der funktionellen Gruppe und des durchschnittlichen Substitutionsgrades von Carboxymethylstärke
Abstract Für die Charakterisierung chemisch modifizierter Stärkederivate ist die Kenntnis ihres Anteiles an funktionellen Gruppen erforderlich. Bei der Carboxymethylstärke ist es die CH 2 COONa‐Gruppe, deren molare Relation zu den Glucose‐Einheiten des Stärkemoleküls den durchschnittlichen Substitutionsgrad ergibt. M…
On the Relationship of Thermodynamic and Physical Properties of Polymers With Ice Adhesion
The purpose of this work is to study the relationship of energetic and physical properties of polymetric materials with ice adhesion, and to develop the material to prevent ice adhesion. From various parameters of water and ice, dispersion and hydrogen bond contribution of surface free energy of ice were calculated. U…
ENGINEERING PROPERTIES OF FIRST GENERATION PLASTICIZED SULFUR BINDERS AND LOW TEMPERATURE FRACTURE EVALUATION OF PLASTICIZED SULFUR PAVING MIXTURES
The low temperature fracture potential, fatigue potential, and deformation characteristics of first generation plasticized sulfur binders in paving mixtures are discussed. Fracture mechanics techniques were used in the characterization of these materials. Recommendations, based on properties of first generation materi…
Open‐cell flexible polyurethane foams: Comparison of static and dynamic compression properties
Abstract Dynamic stress–strain diagrams of polyurethane packaging foams have been obtained from free fall drop tests. The dynamic curves become higher as the deformation rates increase. An equation is proposed to describe the stress–strain dependence for different deformation rates. The model of filament buckling expl…
Toxicology of Iohexol
This review summarizes the biological profile of the nonionic contrast medium, iohexol, with particular emphasis on neurovascular and myelographic applications. Iohexol was compared with conventional ionic media and with newer nonionic agents in a variety of animal models. Studies of systemic toxicity (teratogenicity,…
Unusual thermal expansion of a B – O bond in the structure of danburite CaB2Si2O8
The crystal structure of danburite has been studied at high temperatures up to 900°C based on single-crystal diffraction intensities collected on a four-circle diffractometer. The thermal response of the structure is basically characterized by an unusual expansion of a specific bond, B – O(2b), of the borate tetrahedr…
Specific surface energies and dissolution behavior of aspirin crystal.
The displacement velocity of each crystalline face of aspirin on dissolution in distilled water was determined by using large single crystals grown from ethanolic solution. It was found that each crystalline face of aspirin has its own displacement velocity. The specific surface energies for those crystalline surfaces…
Structural studies of Technetium Complexes. VIII. The Crystal Structure of Tetraphenylarsonium Tetrabromonitridotechnetate(VI)
The crystal structure of [AsPh4] [TcNBr4] has been determined by single- crystal X-ray diffraction methods at 20±1°C. Crystals are tetragonal, space group P4/n, with a 12.875(2), c 7.992(1)?, and Z 2. Full-matrix least-squares refinement gave a final R value of 0.039 for 1263 independent reflections. The compound is i…
Darstellung und Kristallstruktur von Ba3CdSn2S8 mit einer Anmerkung über Ba6CdAg2Sn4S16
Abstract Die Sulfide Ba 3 CdSn 2 S 8 (A) und Ba 6 CdAg 2 Sn 4 S 16 (B) wurden erstmals dargestellt und die Kristallstruktur mit Einkristalldaten von (A) bestimmt. (A) und (B) sind isotyp und kristallisieren in der Raumgruppe I 4 3d‐T (Nr. 220) mit a = 14,7235 ± 0,0007 (Z = 8) für (A) und a = 14,7253 ± 0,0007 Å (Z = 4)…
Fluorene Analogues of Biphenyls: Comparison of Mesogenic Behaviour
A variety of 2, 7-disubstituted fluorenes has been synthesised including 2-alkyl-7-cyanofluorenes, 2-pentyl-7-fluorenyl esters and esters of 7-pentyl-2-fluorenecarboxylic acid. Transition temperatures have been determined and are compared with those of analogous biphenyl compounds: it is found that the melting points…
An overview on defect studies in MCT
Major advances in recent studies of defects in MCT are reviewed, including our current understanding of defect formation mechanisms, dynamics, and their electronic properties. New attempts to control the defects are also discussed. Several key technical issues are raised which should serve as guidelines for future res…
Changes of Lattice Geometries Upon Charge Transfer
General perturbation theoretical arguments are given for the opposite effect of small positive and negative charge transfer on the geometry of solids. Applications to π-conductors, such as intercalated graphites and doped polyacetylenes, indicate C-C bond elongation for donor compounds and shortning for acceptor compo…
Verfahren zur Minderung von NOx‐Emissionen in Rauchgasen
Abstract Processes for lowering NO x emissions in flue gases . The authors survey processes currently under development for reducing NO x emission levels of combustion units. Primary measures, i.e. acting upon the combustion process itself, do not suffice to meet the recently stiffened limiting emission values; partic…
Size Determination of Latex Particles by Electron Microscopy
The diameters of Dow latex particles in the size range from 0.085 to 0.330 μm were determined by electron microscopy. The effects of electron irradiation and the vacuum conditions in the microscope on the measured particle diameter were investigated. A comparison among latex samples was also made. The results confirme…
DC conductivity of voltalit epoxy spacers in SF6
In order to determine the stremes in high voltage DC cable accessering containing a combination of Voltalit (a proprietary epoxy Insulation), SF4 and paper/oil inxulation, a knowledge of the surface and bulk conductivily of the Voltalit is required. It ii also necessary to determine the coefficient govering the depend…