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The Preparation Of High Purity Boron Via The Iodide
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Book Synopsis The Preparation of High-purity Boron Via the Iodide by : A. F. Armington
Download or read book The Preparation of High-purity Boron Via the Iodide written by A. F. Armington and published by . This book was released on 1964 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper the present methods of boron preparation are discussed with emphasis on the iodide intermediate. Several methods of boron triiodide preparation were investigated, the most satisfactory method being the preparation from the elements. A yield of 60 pct based on iodine is found for this method. Zone-refining, sublimation, distillation, and fractionalrecrystallization results are given for the boron triiodide, with distillation producing the best results. Several methods of decomposition are also discussed. The purity of the resulting iodide boron approximates the purity of the best available bromide boron. (Author).
Book Synopsis The Preparation of High-purity Boron Via the Iodide by : Alton F. Armington
Download or read book The Preparation of High-purity Boron Via the Iodide written by Alton F. Armington and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper the present methods of boron preparation are discussed with emphasis on the iodide intermediate. Several methods of boron triiodide preparation were investigated, the most satisfactory method being the preparation from the elements. A yield of 60 pct based on iodine is found for this method. Zone-refining, sublimation, distillation, and fractionalrecrystallization results are given for the boron triiodide, with distillation producing the best results. Several methods of decomposition are also discussed. The purity of the resulting iodide boron approximates the purity of the best available bromide boron. (Author)
Book Synopsis The Preparation of High-purity Boron by :
Download or read book The Preparation of High-purity Boron written by and published by . This book was released on 1950 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Investigation of the Preparation and Evaluation of High Purity Elemental Boron by : J. T. Buford
Download or read book The Investigation of the Preparation and Evaluation of High Purity Elemental Boron written by J. T. Buford and published by . This book was released on 1966 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrapure boron was produced via the boron triiodide intermediate. The BI3 was synthesized from crude elemental boron and C.P. grade iodine at various temperatures. A conversion efficiency of 56% was obtained using a charge of -4 +6 mesh boron at a temperature of 900-950C. Purification of the boron triiodide was performed by distillation in a 30 plate Oldershaw distillation apparatus, by batch zoning of the BI3 matrix, and by vacuum distillation. Thermal decomposition of the distilled BI3 produced boron with approximately 50 ppm carbon as the major impurity. The carbon impurity was measured by a gas chromatographic technique. Boron was crystallized for electrical measurements by vacuum zoning, using induction heating and by melting in a high pressure resistance heated furnace. Using this same high pressure equipment the synthesis of boron phosphide, boron arsenide and boron antimonide was studied. (Author).
Book Synopsis Preparation of High-Purity Single-Crystal Boron by :
Download or read book Preparation of High-Purity Single-Crystal Boron written by and published by . This book was released on 1962 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preparation of High-purity Boron Nitride Powder by : C. R. Schmitt
Download or read book Preparation of High-purity Boron Nitride Powder written by C. R. Schmitt and published by . This book was released on 1969 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Boron and Refractory Borides by : G.V. Samsonov
Download or read book Boron and Refractory Borides written by G.V. Samsonov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: V. I. MATKOVICH During the meeting of the International Symposium on Boron held in October, 1972 in Tbilisi, U.S.S.R., the idea was proposed to assemble a review of boron and refractory borides by the specialists present. The advantages of such a work were immediately apparent. Such diverse applications of borides as in protective armor, nuclear reactors, coat ings, reinforcement, etc. can hardly all be presented in sufficient detail by a single author. On the other hand it was also recognized that with so much specialization, some areas of interest may not be covered. Within the last decade or two a number of areas have been developed in which the use of refractory borides is growing and improvements are being actively explored. Thus, a number of borides have considerable potential as reinforcing material for plastics or light metals, though only boron fibers have been firmly established up to the present. Ap plication of flakes and films for two-dimensional reinforcement appears attractive, although the high cost of materials and development repre sents a considerable barrier. A number of borides have been used to manufacture lightweight protec tive armor. In this area relatively fast changes seem to be taking place as improvements in performance and weight are made. Boron carbide has found considerable use in this application and new developments exploit the light weight of beryllium borides.
Book Synopsis Geometry and First-order Error Statistics for Three- and Four-station Hyperbolic Fixes on a Spherical Earth by : Edward A. Lewis
Download or read book Geometry and First-order Error Statistics for Three- and Four-station Hyperbolic Fixes on a Spherical Earth written by Edward A. Lewis and published by . This book was released on 1964 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Certain fundamental geometric properties of hyperbolas and ellipses on the surface of a sphere are developed. A first-order theory is then presented for the random errors in the location of a point on a spherical earth, by the intersection of spherical hyperbolas physically determined by a time difference technique in which the individual errors are 'normally' distributed and uncorrelated. Two cases are treated: (a) Four time-measuring stations working as two independent pairs, and (b) Three time-measuring stations working on a common time-base. In both cases, the contours of equal error probability density are shown to be ellipses and their properties are discussed. In both cases the distribution of radial error without regard to direction is given by a generalized distribution function which contains the Rayleigh distribution as a special case. Using the general form, the most probable mean, root mean square, and median radial errors are obtained. The results are adaptable to include errors in ordinary direction finders as well as those of the hyperbolic type. Numerical examples are included. (Author).
Book Synopsis Absorption Spectra of H2 in the Vacuum Ultraviolet Region by : Takeshi Namioka
Download or read book Absorption Spectra of H2 in the Vacuum Ultraviolet Region written by Takeshi Namioka and published by . This book was released on 1965 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dolph-Tchebyscheff Arrays of Many Elements and Arbitrary Uniform Spacing by : Charles J. Drane (Jr.)
Download or read book Dolph-Tchebyscheff Arrays of Many Elements and Arbitrary Uniform Spacing written by Charles J. Drane (Jr.) and published by . This book was released on 1964 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optimum design of Dolph-Tchebyscheff broadside arrays of an odd number of elements presents definite computational problems in terms of existing excitation coefficient design procedures, particularly for element spacings of less than a half-wavelength. This paper presents approximate representations for these coefficients in terms of Bessel functions for arrays of, say, more than twenty elements of arbitrary but uniform spacing. To facilitate comparison of the approximations with exact theory, graphs and tables are presented for various main beam--sidelobe ratios, numbers of array elements, and element spacing. (Author).
Book Synopsis Wave Interaction in Oxygen Magnetoplasmas by : K. V. Narasinga Rao
Download or read book Wave Interaction in Oxygen Magnetoplasmas written by K. V. Narasinga Rao and published by . This book was released on 1965 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Machine-aided Design of Context-free Grammars by : Thomas G. Evans
Download or read book Machine-aided Design of Context-free Grammars written by Thomas G. Evans and published by . This book was released on 1965 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The following paper represents work to date on the deformation method for quadratic programming and thus may be regarded as a sequel to Zahl, S. (1964) A Deformation Method for Quadratic Programming, Research Note AFCRL-63-132. It gives an explanation of a modified Iverson programming language and uses this to give a detailed algorithm for the Zahl Deformation Method of Quadratic Programming.
Book Synopsis The Dielectric and Wire Grid Transmission Line by : Otho E. Kerr (Jr.)
Download or read book The Dielectric and Wire Grid Transmission Line written by Otho E. Kerr (Jr.) and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A surface wave antenna which has six parameters is discussed. The formulas developed permit a somewhat independent control of the phase and amplitude distribution along surface wave and leaky wave antennas. This design lends itself more readily to the fabrication of non endfire surface wave antennas that were previously designed for the same purpose. Finally it is noted that the formulas developed can be used to design a large number of well known wave guides and surface wave transmission lines. (Author).
Book Synopsis Substituted Perinaphthenyl Anion Radicals by : Tapan K. Mukherjee
Download or read book Substituted Perinaphthenyl Anion Radicals written by Tapan K. Mukherjee and published by . This book was released on 1965 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Resolving Power of Ground Mapping Radar Antennas by : J. F. McIlvenna
Download or read book On the Resolving Power of Ground Mapping Radar Antennas written by J. F. McIlvenna and published by . This book was released on 1965 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mapping of extended, cultural ground targets by an airborne radar is examined using communication theory concepts including those of the antenna transfer function and the target spatial frequency spectrum. Use of the set of transfer functions that correspond to Taylor aperture distributions and specification of the targets directly in terms of their spatial frequency spectra, permits one to examine the antenna images for quality and resolution. The results obtained indicate that resolution for a class of ground targets can be much better than is predicted by the two-point Rayleigh resolution criterion. It is also true that there can be situations in which the shape of the antenna images are quite independent of the radiation pattern. Several types of spatial noise were also included in the input spectrum to investigate noise effects on image quality and resolution. (Author).
Book Synopsis On the Convergence and Ultimate Reliability of Iterated Neural Nets by : R. H. Urbano
Download or read book On the Convergence and Ultimate Reliability of Iterated Neural Nets written by R. H. Urbano and published by . This book was released on 1964 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Experimental Parameters on Thermoluminescence of a Type II-a Diamond by : Albert D. Johnson
Download or read book Effects of Experimental Parameters on Thermoluminescence of a Type II-a Diamond written by Albert D. Johnson and published by . This book was released on 1965 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoluminescence provides a method for studying properties of those crystalline imperfections which behave as electron traps and recombination centers in wide bandgap materials. This approach, however, has been used relatively little, possibly due to the fact that the shapes and intensities of thermoluminescent glow curves are functions of several experimental parameters and are often complicated by the overlapping of a number of individual glow peaks. In the present work, experimental parameters were isolated and some of their effects on thermoluminescent glow curves were analyzed. This yielded information on activation energies associated with trapping levels, the nature of the kinetics involved in electron transitions, and electron retrapping. A Type II-a diamond, which has a wide distribution of thermoluminescent glow peaks, was used in this work. (Author).
