Hydrogention and Oxidation of Allyl Alcohol in the Presence of Colloid Palladium In Situ

Kinetic regularities of hydrogenation, oxidation with oxygen, and condensation of allyl alcohol in the presence of colloid palladium in situ were revealed. A mechanism of the reactions was proposed.     

Structure of the Products of Stimulated Carbonization of Aromatic Hydrocarbons

This paper deals with X-ray photoelectron and electron microscopy studies of the structure of carbon–metal-containing micro- and nanotubulenes. Ab initio quantum-chemical calculations were performed to analyze the possibility and mechanism of tubulene formation.     

IR Emission Spectra of Carbonate-Chloride Melts 2CsCl-NaCl-Cs2CO3 Containing Lithium and Beryllium Ions

The IR emission spectra of the molten systems NaCl-CsCl-Cs₂CO₃-MCl _n (M = Li, Be) have been obtained. Spectral data shows that, at a definite limiting molar ratio n _lim = [CO₃]/[Mⁿ⁺] characteristic for each Mⁿ⁺, carbonate-chloride melts based on the NaCl-CsCl eutectic contain carbonate complexes [Li(CO₃)₃]^5? and [Be(CO₃)₃]^4? and, if n < n _lim, carbonato chloro complexes [M(CO₃) _m Cl_4?m ], where m = 1–2.     

Kinetics of Reaction between Oxygen and Hydrogen in Water in the Presence of Pd(0)-containing Compounds

Kinetic features of the reaction of oxygen with hydrogen in water in the presence of colloidal palladium in situ, palladium black, and the giant Pd cluster Pd_{5 6 1}Phen_{6 0}(OAc)_{1 8 0} are studied, and the reaction mechanism is proposed.     

High-temperature calibration of a multi-anvil high pressure apparatus

Fusion and solidification of Al and Ag samples, as well as Fe₉₃–Al₃–C₄, Fe₅₆–Co₃₇–Al₃–C₄, and Fe_57.5–Co₃₈–Al₁–Pb_0.5–C₃ alloys (in wt%), have been investigated at 6.3?GPa. Heater power jumps due to heat consumption and release on metal fusion and solidification, respectively, were used to calibrate the thermal electromotive force of the thermocouple against the melting points (mp) for Ag and Al. Thus, obtained corrections are +100°C (for sample periphery) and +65°C (center) within the 1070–1320°C range. For small samples positioned randomly in the low-gradient zone of a high pressure cell, the corrections should be +80°C and +84°C at the temperatures 1070°C and 1320°C, respectively. The temperature contrast recorded in the low-gradient cell zone gives an error about ±17°C. The method has been applied to identify the mp of the systems, which is especially important for temperature-gradient growth of large type IIa synthetic diamonds.     

Classification of alpha-active workplace aerosols based on coefficient of transportability as measured by the dialysis method

The speciation of the products from the reaction of⁵¹Cr(VI) with concentrated perchloric and trifluoromethanesulfonnic acids was carried out by ion chromatography, using HCIO₄ and Ca(CIO₄)₂ as eluents. The reaction (1 h) of high specific activity⁵¹Cr(VI) with 99% CF₃SO₃H produces 47.6% of the⁵¹Cr as a 3+ species (hexaaquochromium(III), 27.6% as a 2+ species and 1.7% as a 1+ species. The reaction with 70% HClO₄ gave 82.5% of the⁵¹Cr as a 3+ species, 14.0% as a 2+ species and 2.9% as a 1+ species. The 1+ and 2+ species undergo slow reactions to give the hexaaquo form.     

A scintillation method for determination of actinide alpha-activity in samples

This report describes an efficient, easy to use, and inexpensive method for detection of alpha-activity in biological samples, the alpha radiometer. The actinide elements are coprecipitated from acid-dissolved, ashed samples with bismuth phosphate and the precipitate is then mixed with ZnS(Ag) scintillation powder. The mixture is dried, in a thin layer, on the surface of a polystyrene cuvet and scintillations from the layer are detected with a photomultiplier tube. An optimal counting efficiency is obtained with a scintillation powder thickness between 25 and 40 mg·cm⁻².     

IR and electronic spectra of complex Co<Superscript>2+</Superscript> groups in chloride-fluoride and carbonate-chloride melts

The IR and electronic absorption spectra of molten mixtures in the NaCl-CsCl-NaF-CoCl₂, NaCl-KCl-NaF-CoCl₂, and NaCl-KCl-NaKCO₃-CoCl₂ systems have been studied. The spectral data show that, for all molten mixtures, the composition ranges exist in which chloro fluoro Co(Cl _n F _m )(n + m = 4–6) and carbonato chloro CoCl(CO₃)_{4 − n} (n = 1–3) complex groups are formed at δ₁ < δ₁^* and δ₂ < δ₂^* (δ₁^* = F/Co and δ₂^* = CO₃/Co). At δ₁ ≥ δ₁^* and δ₂ ≥ δ₂^*, the mixtures contain complexes homoligand Co and CoF₆⁴⁻ and Co(CO₃)₄⁶⁻.     

Analysis for actinides in tissue samples from plutonium workers of two countries

For more than 25 years, the United States Transuranium and Uranium Registries (USTUR) and the Dosimetry Registry of the Mayak Industrial Association (DRMIA) of the Russian Federation have, each independently, collected tissues at autopsy from workers with potential or confirmed body burdens of actinide elements resulting from occupational exposures. Tissues, thus obtained, were radiochemically analyzed for actinides for the purpose of evaluating the biokinetics of these elements in the human body. Scientists of these two organizations have recently begun a collaborative research program to compare, combine and analyze the data to verify or refine biokinetic models needed for radiation dosimetry.     

Crystallomorphological and Crystallochemical Indicators of Diamond Formation Conditions

Crystallography Reports - An analytical review of the results of experimental studies of diamond crystallization and dissolution in systems with different compositions and mantle P–T...