Organic superconductors
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Ba5(GaS4)2: Das erste ortho-Thiogallat(III) / Ba5(GaS4)2: The First ortho-Thiogallate(III)
The new compound Ba 5 (GaS 4 ) 2 crystallizes in the orthorhombic system (space group: Cmca) with lattice constants a = 2249.4(12) pm, b = 1214.6(8) pm, c = 1188.7(8) pm. In the structure there are isolated GaS 4 5- -tetrahedra. According to stoichiometry and structure this compound belongs to the complex salts, and i…
Efficient synthesis of 2-oxy-5,10,15,20-tetraphenylporphyrins from a nitroporphyrin by a novel multi-step cine-substitution sequence
(2-Nitro-5,10,15,20-tetraphenylporphyrinato)copper(II)(1) reacts with sodium benzylate or sodium methoxide in dimethylformamide by a novel aromatic nucleophilic substitution-nucleophilic addition sequence in which hydrogen is the leaving group to give the corresponding 2,2-dialkoxy-3-dihydroporphyrins which are effici…
Incipient Phenomena of Frost Formation
Experiments have been performed to investigate the effect of cooled-plate characteristic on frost formation under the condition of forced convection. Two kinds of plates having the different contact angles to water, were utilized. Special attention was focused on the incipient phenomena of the effect of the plate cont…
Thermal cracking of kerosine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal cracking of kerosineCarl E. Van Camp, Paul S. Van Damme, and Gilbert F. FromentCite this: Ind. Eng. Chem. Process Des. Dev. 1984, 23, 1, 155–162Publication Date (Print):January 1, 1984Publication History Published online1 May 2002Published inissue 1 January 1984https…
Theory of magnetic susceptibility in acceptor and donor graphite intercalation compounds
The tight binding calculation of the orbital magnetic susceptibility in Graphite Intercalation Compounds is reexamined to account for the different behaviour of Donor and Acceptor Compounds. The two dimensional tight binding model for π electrons treating symmetrically valence and conduction bands cannot explain exper…
Development of a Device for Measuring Heat-Moisture Transfer Properties of Apparel Fabrics
A new device has been developed to measure the heat transfer properties of apparel fabrics and is reported in this paper with some examples of an application of this device. The basic functions of this device are as follows : (1) Detection of the heat absorption by a fabric ; This absorption starts just after the touc…
The induction of skin tightness by surfactants
We have examined the relationship between surfactant structure and the sensation of tightness which ordinarily occurs on facial skin a few minutes after face washing. Most anionic surfactants cause various degrees of skin tightness, the order being, TEA-lauryl phosphate < potassium myristate = TEA-cocoyl glutamate < s…
The structural properties of synthetic Sr-gehlenite, Sr2Al2SiO7
The crystal structure of Sr-gehlenite Sr 2 Al 2 SiO 7 is tetragonal with space group P [unk]2 1 m , a = 7.820(1), c = 5.264(1) Å, Z = 2 and D x = 3.821 g · cm −1 , and was refined to R = 3.6% using 345 non-equivalent reflections. This compound is confirmed to be isotypic with gehlenite Ca 2 Al 2 SiO 7 . In this Sr-geh…
The synthesis and electrochemical study of new electrochromic viologen-based materials
A range of diquaternary salts of 4,4′-bipyridine and 3,8-phenanthroline were prepared and subsequently screened using electrochemical and spectroscopic techniques. It was determined that the stability of the radical film deposited on cathodic reduction of aqueous solutions of these salts may be strongly influenced by…
Spectroscopic study of the adsorption of carbon monoxide on solutions of nickel oxide and magnesium oxide. Part 2.—Samples pretreated with hydrogen
MgO–NiO solid solutions can be reduced by H2 in two steps: in the first (temperature range 673–1093 K) mainly the Ni2+ ions located on the surface are involved, while in the second (T > 1093 K) those located in the bulk are also reduced.The dimensions of the Ni particles formed during the reduction process increase wi…
Semiconducting properties and band structure of MoTe2 single crystals
Transport coefficients measurements (electrical conductivity, Hall effect, thermoelectric power) have been performed on monocrystalline MoTe2 samples in a wide temperature range (77-700 K). The samples were prepared by a based Te flux method. Experimentals results are interpreted on the basis of a p-type semi-conducto…
REPRODUCTIVE BIOLOGY OF THE MUGGER CROCODYLUS-PALUSTRIS
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Nitrido-bridged iron phthalocyanine dimers: synthesis and characterization
A new macrocyclic N-bridged species of formula [PcFe–N–FePc](Pc = phthalocyaninato anion, C32H16N82–) has been prepared by reaction of PcFe with NaN3 in α-chloronaphthalene and structurally and electronically characterized by i.r., visible, X-Ray powder, and e.s.r. measurements: one-electron oxidation leads to the cat…
BACKSCATTERED ELECTRON IMAGES OF POLISHED CEMENT SECTIONS IN THE SCANNING ELECTRON MICROSCOPE
Using a pair of backscattered electron detectors in the scanning electron microscope, images can be produced in which the intensity is dependent solely on the molecular weight of the imaged area, and independent of small fluctuations in topography. The use of this technique with polished, unetched cement sections, rev…
New Techniques Rapid Deparaffinization for Electron Microscopy
The authors present a method by which the number of steps required for the ultrastructural study of material originally embedded in paraffin can be greatly reduced. The process reduces deparaffinization, post-fixation, and re-embedding to four steps that take little more than 30 min to complete.
Pressure Tube Development for CANDU Reactors
A development program is described in which reactor grade Zr-2.5Nb pressure tubes were produced with properties comparable to current reactor tubes but which are expected to show lower in-reactor creep and growth. Lower creep and growth rates would mean smaller axial elongations of tubes in service. Evaluation of the…
Viscosity behavior of the polyelectrolyte poly(vinyl alcohol) having some intrachain crosslinks
Abstract The viscosity behavior of aqueous poly(vinyl alcohol) (PVA)‐borax‐NaCl systems was investigated. The intrinsic viscosity [η] of PVA in borax solution increases with increasing borax concentration. In solutions containing both borax and NaCl, on the other hand, [η] decreases with increasing concentration of Na…
Quantum-Chemical Study of the Corrosion Inhibition of Mild Steel in 6% (wt/wt) HCl by means of Cyanoguanidine Derivatives
Corrosion inhibitive efficiencies of Biguanide monohydrochloride, Dicyandiamide, Guanyl urea-o-hydrochloride and Biuret have been determined by the gravimetric method. It has been shown that the energy eigen values, and the π-electron distributions of the compounds, obtained using the Hückel method, can offer a very u…
Separation of marine seston and density determination of marine diatoms by density gradient centrifugation
An attempt has been made to separate constituents of marine seston samples: inorganic material, detritus and the algal species, by density gradient centrifugation, without affecting the physiological state of the algae. A relatively inert gradient material, consisting of Percoll, salt and sucrose, was composed. Since…