Synthesis of δ-Hydroxy-β-oxo Esters using Sonochemical Blaise Reaction
All articles of this category δ -hydroxy- β -oxo esters - Blaise reaction - β -hydroxynitriles - sonication - zinc
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Removal of Tetravalent NOx from Flue Gases Using Solutions Containing Hydrogen Peroxide
The absorption of NOx(IV) into nitric acid solutions containing a low concentration of hydrogen peroxide was studied in a small packed column. A simple mathematical model developed for this absorption was used for the determination of kinetic parameters relative to NO2 and N2O4in such solutions. Results obtained at 10…
The Discovery of Magnesioferrite from Au (Fe, Cu) Magnesian Skarn Deposits and Study of the Magnesioferrite‐Magnesiomagnetite Series
Abstract: Magnesioferrite, a rare metasomatic mineral, was discovered for the first time in China from the Qinlou Au (Fe, Cu) magnesian skarn deposit, Sanpu, Huaibei, Auhui Province, and the Mulonggou Fe (Mo, Cu) magnesian skarn deposit, Luonan County, Shaanxi Province. In this paper, the geological setting, mineral a…
Effects of Oxide Content on the Glass‐Forming Ability of the Ga 2 S 3 ‐Na 2 S System
Gallium–sodium–sulfide glasses have been shown to be the most promising host for the 1.3 μm fiber optic amplifier so far. However, the current study has revealed that the formation of stable glasses in this system relies on the existence of a certain amount of oxide in the composition. A glass‐forming region was ident…
Availability of Nutrients in Wood Ash Amended Tropical Acid Soils
A greenhouse study was conducted to assess nutrient availability in wood ash when applied to surface soil samples of three tropical acid soils (Kandiudult) from Cameroon. Amendments were applied at rates to attain target pH values of 5.5, 6.0 and 6.5. Lime treatments were included as a control. Rye grass (Lolium peren…
Underdoped manganites: Canted antiferromagnetic ordering or two-phase ferro-antiferromagnetic state?
We calculate the energy of charge-carrier-induced canted ordering in conducting layered antiferromagnetic systems with double exchange. The quantum approach to the d -spins is used. In the jellium model the energy of the canted state is lower than the energies of both collinear ferro-and antiferromagnetic states over…
Formation of porous silicon using an ammonium fluoride based electrolyte for application as a sacrificial layer
A new electrolyte is presented for the electrochemical formation of porous silicon. The electrolyte, an ammonium fluoride etch mixture (AFEM), is used instead of hydrofluoric acid (HF) which is normally used for porous silicon (PS) formation. The main advantage of AFEM is that it attacks aluminium at a significantly l…
Statistical Considerations in Microanalysis by Energy-Dispersive Spectrometry
: X-ray counting statistics plays a key role in establishing confidence limits in composition determination by X-ray microanalysis. The process starts with measurements of intensity on one or more samples and standards as well as related background determinations. Since each individual measurement is subject to variab…
The bcc-to-fcc phase transformation during dezincification of β-phase Cu-Zn
β-phase Cu-48at% Zn single-crystal slices with (100)β and (110)p surface orientations have been dezincified in vacuum at 450 and 600°C for various times, and the resulting surfaces have been studied by optical microscopy, and also by scanning and transmission electron microscopy. On dezincification, the β phase become…
Characterization of neoformed illite from hydrothermal experiments at 250 degrees C and P (sub v,soln) ; an HRTEM/ATEM study
Other| December 01, 1998 Characterization of neoformed illite from hydrothermal experiments at 250 degrees C and P (sub v,soln) ; an HRTEM/ATEM study Douglas M. Yates; Douglas M. Yates Washington State University, Department of Geology, Pullman, WA, United States Search for other works by this author on: GSW Google Sc…
Structure and Properties of Injection Moldings of β-Crystal Nucleator-added PP
Abstract Aiming at a synergism of improvements of impact strength of polypropylene by the addition of β-crystal nucleator and of its rigidity by the filling of particulate, the addition of the nucleator to particulate-filled polypropylenes has been studied. 0 to 3000 ppm of γ-quinacridone (GQ) which is a β-crystal nuc…
Poly[4-(2-heteroaryl)benzenamines]: Novel Electrically Conducting Alternating Copolymers of Aniline and Chalcophenes
Polyaniline (PAN)—an electrically conductive conjugated polymer—was always of major interest due to its unique properties. However, the insolubility of PAN in common organic solvents hampered commercial exploitation. The synthesis of new copolymers of aniline and chalcophenes is reported. The Figure shows a scanning e…
Multiple Light Scattering Model Applied to Reflective Display Materials
An estimate for the minimum film thickness required to give the scattering state of a reflective display material, such as a polymer dispersed liquid crystal (PDLC) or polymer stabilized cholesteric texture (PSCT), a desired diffuse luminous reflectance is presented. It is concluded that single scattering models are n…
Comparison of the Molecular Weight Distribution of Gelatin Fractions by Size-exclusion Chromatography and Light Scattering
Commercial gelatin is a heterogeneous proteinaceous product with a broad range of molecular weights. The use of gelatin to prepare insoluble nanoparticles depends largely on the presence of high molecular weight fractions that can be separated by size-exclusion chromatography. The purpose of this study was to determin…
The Interlayer Structure of La-Vermiculite
Abstract The structure of the interlayer cation-water system in La-vermiculite with a unit cell of a = 5.33(5), b = 9.18(6), c = 15.13(9) Å and β = 96.82(7)° has been determined in space group C 2/ m . Under ambient conditions, the interlayer La cations are distributed on a 3 a × b superlattice which disappears on deh…
Analysis of dislocation microstructures: Impact of force truncation and slip systems
We present a systematic investigation of the microstructures resulting from simulations of overdamped dislocation dynamics and quantitatively assess the impact of various slip system constraints and force truncation schemes. We show that the degree of local ordering in these structures correlates with the number of ac…
High Temperature Reactive Ion Etching of Indium‐Tin Oxide with HBr and CH 4 Mixtures
Reactive ion etching of indium‐tin oxide using HBr/ feed gas at 250°C has been studied in four areas: feed gas composition, power, loading factor, and surface analysis. The result was compared with that using HCl/ as the feed gas. There was no anomalous high rate peak throughout the whole concentration range. Etch rat…
On the complex zonality in grandite garnets and implications
Abstract The available data on compositional zoning in grossular-andradite (grandite) garnets occurring at different scales, mainly due to the variations of their Fe 3+ /Al ratios, and the hypotheses on the origin of this zoning are reviewed. Four zoned crystals of grandites showing different optical properties have b…
Oxygen uptake measurements to identify the cause of unexpected differences between accelerated and outdoor weathering
For unstabilised PE the rate of oxygen uptake and CO and CO2 formation, the increase in carbonyl absorbance and the deterioration of the elongation at break are highest for two different accelerated weathering tests and less high in outdoor weathering tests in Florida and in the south of France. These rates are lowest…
Brillouin-scattering studies of ferroelectric[NH3(CH3)]5Bi2Cl11
High-resolution Brillouin spectroscopy was used to investigate the elastic properties of $[{\mathrm{NH}}_{3}{(\mathrm{C}\mathrm{H}}_{3}{)]}_{5}{\mathrm{Bi}}_{2}{\mathrm{Cl}}_{11}.$ The temperature dependences of nine phonon modes propagating in the directions [100], [010], [001], [110], [101], and [011] were obtained…