Pirometalurška obdelava katalizatorja z vsebnostjo srebra

The following article describes the thermal process for the recovery of used silver from Ag catalysts using an 80-kVA plasma reactor, along with an appropriate flux and reducing agent. An Ag catalyst was melted in three separate experiments with different weights. The overall recovery of silver from the melted Ag catalysts was high (93.8-96.4) %. The byproducts of the melting of the Ag catalysts were the inert vitrified slag, synthesis gas and fly ash. The chemical analysis of fly ash confirmed that, in addition to mechanically stripped oxides that were present in the batch (CaO, SiO2, MgO, and Al2O3), fly ash also contained a high amount of condensed silver. Indeed, silver evaporated at a high temperature during the melting process. The silver condensed in fly ash was at a level of 37.08-48.37 % of the total weight of fly ash. Therefore, fly ash had to be recycled. The synthesis gas from the process had a relatively low heating value (0.6335 MJ m(-3)).Članek opisuje termični način pridobivanja srebra iz rabljenih Ag katalizatorjev v 80 kVA plazemskem reaktorju v prisotnosti ustreznih talil in redukcijskega sredstva. Ag katalizator se je talil v treh poskusih z različno maso. Skupi iznos srebra pri procesu taljenja Ag katalizatorjev je bil visok (od 93,8 % do 96,4 %). Pri taljenju katalizatorja je nastajala inertna vitrificirana žlindra, sintezni plin in ostale ubežne emisije. Kemična analiza ubežnih emisij je potrdila, da so poleg mehansko odtrganih oksidov iz vhodnega materiala (CaO, SiO2, MgO, Al2O3) vsebovale tudi višjo vsebnost kondenziranega srebra. Srebro je v procesu taljenja izparelo pri visoki temperaturi. V ubežnih emisijah kondenzirano srebro je bilo na nivoju od 37,08 % do 48,37 %. Ubežne emisije je bilo treba zato reciklirati. S procesom pridobljeni sintezni plin je bil razmeroma nizke kalorične vrednosti (0.6335 MJ m–3).Web of Science52213813

On Real Solutions of the Equation Φ\u3csup\u3e\u3cem\u3et\u3c/em\u3e\u3c/sup\u3e (\u3cem\u3eA\u3c/em\u3e) = 1/\u3cem\u3en\u3c/em\u3e J\u3csub\u3e\u3cem\u3en\u3c/em\u3e\u3c/sub\u3e

For a class of n × n-matrices, we get related real solutions to the matrix equation Φt (A) = 1/n Jn by generalizing the approach of and applying the results of Zhang, Yang, and Cao [SIAM J. Matrix Anal. Appl., 21 (1999), pp. 642–645]. These solutions contain not only those obtained by Zhang, Yang, and Cao but also some which are neither diagonally nor permutation equivalent to those obtained by Zhang, Yang, and Cao. Therefore, the open problem proposed by Zhang, Yang, and Cao in the cited paper is solved

On the hyper-order of solutions of nonhomogeneous linear differential equations

In this paper, we study the hyper-order of solutions of higher order linear differential equation begin{equation*} f^{(k)}+A_{k-1}(z)f^{(k-1)}+ldots A_{1}(z)f^{prime }+A_{0}(z)f=H(z),end{equation*} where $kgeq 2$ is an integer, $A_{j}left( zright)$ $(j=0,1,ldots,k-1)$ and $Hleft( zright)$ $left( notequiv 0right)$ are entire functions or polynomials. We improve previous results given by Xu and Cao

Model Selection based on the Angular-Diameter Distance to the Compact Structure in Radio Quasars

Of all the distance and temporal measures in cosmology, the angular-diameter distance, d_A(z), uniquely reaches a maximum value at some finite redshift z_max and then decreases to zero towards the big bang. This effect has been difficult to observe due to a lack of reliable, standard rulers, though refinements to the identification of the compact structure in radio quasars may have overcome this deficiency. In this Letter, we assemble a catalog of 140 such sources with 0 < z < 3 for model selection and the measurement of z_max. In flat LCDM, we find that Omega_m= 0.24^{+0.1}_{-0.09}, fully consistent with Planck, with z_max=1.69. Both of these values are associated with a d_A(z) indistinguishable from that predicted by the zero active mass condition, rho+3p=0, in terms of the total pressure p and total energy density rho of the cosmic fluid. An expansion driven by this constraint, known as the R_h=ct universe, has z_max=1.718, which differs from the measured value by less than ~1.6%. Indeed, the Bayes Information Criterion favours R_h=ct over flat LCDM with a likelihood of ~81% versus 19%, suggesting that the optimized parameters in Planck LCDM mimic the constraint p=-rho/3.Comment: 6 pages, 3 figures, 1 table. Accepted for publication in EP

Light Gluino, Light Bottom Squark Scenario, and LEP Predictions

The scenario of light gluinos and light sbottoms was advocated to explain the discrepancy between the measured and theoretical production of $b$ quarks at the Tevatron. This scenario will have model-independent predictions for $Z\to q\bar q \tilde{g} \tilde{g}$ at the $Z^0$-pole, and $e^+ e^- \to q\bar q \tilde{g} \tilde{g}$ at LEPII. We show that the data for $Z\to q \bar q g^* \to q\bar q b \bar b$ at LEPI cannot constrain the scenario, because the ratio $\Gamma(Z \to q\bar q \tilde{g} \tilde{g})/ \Gamma(Z \to q \bar q g^* \to q\bar q b \bar b) = 0.15 - 0.04$ for $m_{\tilde{g}}= 12-16$ GeV is smaller than the uncertainty of the data. However, at LEPII the ratio $\sigma(e^+ e^- \to q\bar q \tilde{g} \tilde{g})/ \sigma(e^+ e^- \to q \bar q g^* \to q\bar q b \bar b) \simeq 0.4 - 0.2$ for $m_{\tilde{g}}= 12-16$ GeV, which may give an observable excess in $q\bar q b\bar b$ events; especially, the $4b$ events.Comment: to match the published version in PR