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Relevant bibliographies by topics / Valence du Ni

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Academic literature on the topic 'Valence du Ni'

Author: Grafiati

Published: 25 May 2024

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Journal articles on the topic "Valence du Ni"

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KUMARI, KAMLESH, R. K. SINGHAL, K. B. GARG, et al. "A COMPREHENSIVE STUDY OF THE ELECTRONIC STRUCTURE OF BOROCARBIDES BY XPS TECHNIQUE." International Journal of Modern Physics B 17, no. 03 (2003): 361–71. http://dx.doi.org/10.1142/s0217979203015772.

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Polycrystalline samples of YNi 2 B 2 C and magnetic ErNi 2 B 2 C prepared by arc melting technique have been investigated. Resistivity and magnetization measurements yield superconducting transition temperatures for the two samples of ~ 15 K and ~ 11 K respectively. Core level spectroscopic studies on C (1s), B (1s), Ni (2p), Er (4d) and Y (3d) as well as valence band measurements were performed in order to investigate the electronic structure. The results are interpreted to deduce the valence of Y, Er and Ni. Ni is found to exist in 2+ and y in 3+ valence state. The Er spectra indicate that E

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Hsu, Li-Shing, K. L. Tsang, and S. C. Chung. "Resonant Valence-Band Satellites at the Ni-3p Edge of Ni3Al, Ni3Ga and Ni3In." International Journal of Modern Physics B 12, no. 26 (1998): 2757–67. http://dx.doi.org/10.1142/s0217979298001605.

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Valence-band photoemission sspectra of Ni 3 Al , Ni 3 Ga and Ni 3 In were measured with synchrotron radiation at photon energies around the Ni-3p core excitation threshold. The valence-band satellites are resonantly enhanced. The number of holes per Ni atom in the Ni-d band for Ni 3 Al , Ni 3 Ga and Ni 3 In is estimated to be 0.37, 0.30 and 0.34, respectively. The self-energy correction due to the configuration interaction is 0.72, 0.71 and 0.72 eV, respectively, for Ni 3 Al , Ni 3 Ga and Ni 3 In . The Fano parameters and the effective Coulomb interactions between two 3D holes for these interm

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Hacisalihoglu, M. Y., L. Tortora, G. Tomassucci, L. Simonelli, and N. L. Saini. "Anisotropic Local Structure of SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) Superconductor Probed by Polarized X-ray Absorption Fine Structure Measurements." Materials 17, no. 6 (2024): 1301. http://dx.doi.org/10.3390/ma17061301.

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We have investigated the effect of the Ni substitution on the local structure and the valence electronic states of the SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) superconductor with a multi-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy. The As K-edge and Fe K-edge EXAFS measurements in the two polarizations (E‖ab and E‖c) show a clear change in the local structure with Ni concentration. The near-neighbor bondlengths and the related mean-square relative displacements (MSRDs) decrease as the Ni content increases. The polarized X

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Liqing, Chen, Liu Zuqin, and Zhang Wei. "Valence state analysis of elements by EPMA and its application." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (1990): 230–31. http://dx.doi.org/10.1017/s0424820100134752.

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Valence state analyses of Fe and Mn in oxides by EPMA have been reported in literature. In this paper, the effects of valence state on intensity ratios ILα/IKα and ILα/ILβ of Cu, Ni, Co, Fe, Mn, Cr and their oxides, and on intensity ratios ILβ2/ILα1 and ILγ1/ILα1 of Mo, Nb, Zr and their oxides were studied. It was observed that intensity ratios change with valence states in accordance with some regularities, and these effects could be utilized for analyzing the valence states of catalysts.Valence state analysis of elements by EPMA is based on the fact that changes in the states of valence elec

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Hatakeyama, Makoto, Yuki Sakamoto, Koji Ogata, et al. "A study on an unusual SN2 mechanism in the methylation of benzyne through nickel-complexation." Phys. Chem. Chem. Phys. 19, no. 39 (2017): 26926–33. http://dx.doi.org/10.1039/c7cp04739h.

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D'Souza, S. W., R. S. Dhaka, Abhishek Rai, et al. "Surface Study of Ni₂MnGa(100)." Materials Science Forum 684 (May 2011): 215–30. http://dx.doi.org/10.4028/www.scientific.net/msf.684.215.

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The (100) surface of Ni2MnGa ferromagnetic shape memory alloy exhibits intrinsic surface property dissimilar to the bulk as well as influence of compositional variation at the surface. It is shown that by sputtering at room temperature and annealing at high temperature, it is possible to obtain a clean, ordered and stoichiometric surface. However, for even higher annealing temperatures, the surface becomes Mn rich. The (100) surface of Ni2MnGa is found to have Mn–Ga termination. A surface reconstruction to p4gm symmetry is observed in the austenite phase, while the expected bulk truncated symm

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Vereshchagin, Oleg, Olga Frank-Kamenetskaya, and Ira Rozhdestvenskaya. "Bond valence constraints on the composition of 3d-elements bearing tourmalines." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1118. http://dx.doi.org/10.1107/s2053273314088810.

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F.C. Hawthorne (2002) and F. Bosi (2011) showed that bond valence approach is to be applied to stability prediction of tourmaline structure with different chemical composition. Using this approach we considered bond valence constraints on occupation of Y, Z, V and W sites of Cu-, Ni-bearing tourmalines. From the standpoint of the bond valence approach, [3YW] unit is unstable if W site is fully occupied by O2-. The stability of [3YW] unit decreases along a row: 3 divalent cations → 2 divalent cations + 1 trivalent cation → 2 trivalent cation + 1 divalent cations → 3 trivalent cations if W site

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HAGIWARA, M., and K. KATSUMATA. "OBSERVATION OF FRACTIONAL SPIN DEGREES OF FREEDOM IN AN S=1 LINEAR CHAIN HEISENBERG ANTIFERROMAGNET." Modern Physics Letters B 05, no. 11 (1991): 741–46. http://dx.doi.org/10.1142/s0217984991000915.

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We have studied the typical spin one linear chain Heisenberg antiferromagnet, Ni ( C 2 H 8 N 2)2 NO 2( ClO 4) containing a small amount of Cu2+ by electron spin resonance (ESR) technique. The ESR results are successfully explained by the model that the valence bonds in the valence bond solid state are broken at the Cu 2+ sites resulting in fractional spin degrees of freedom at the Ni 2+ sites neighboring the Cu 2+.

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MUN, B. S., M. WATANABE, M. ROSSI, V. STAMENKOVIC, N. M. MARKOVIC, and P. N. ROSS. "THE STUDY OF SURFACE SEGREGATION, STRUCTURE, AND VALENCE BAND DENSITY OF STATES OF Pt3Ni(100), (110), AND (111) CRYSTALS." Surface Review and Letters 13, no. 05 (2006): 697–702. http://dx.doi.org/10.1142/s0218625x06008682.

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The surface segregation, structure, and valence band density of states of Pt 3 Ni (100), (110), and (111) single crystals are characterized with low energy ion scattering (LEIS), low energy electron diffraction (LEED), and ultraviolet photoemission spectroscopy (UPS). The results of LEIS clearly reveal the complete surface segregation of Pt to the top layer on all crystal alloys. LEED indicates the (5 × 1) surface reconstruction on the Pt 3 Ni (100), while (110) and (111) surfaces show (2 × 1) and (1 × 1) patterns, respectively, identical to Pt single crystals. The valence bands density of sta

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Wang, Shuli, Xudong Yang, Zong Liu, Dawen Yang, and Ligang Feng. "Efficient nanointerface hybridization in a nickel/cobalt oxide nanorod bundle structure for urea electrolysis." Nanoscale 12, no. 19 (2020): 10827–33. http://dx.doi.org/10.1039/d0nr01386b.

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Efficient Ni valence state synergism was found active in the electrocatalysis reaction, resulting from the crystal lattice hybridization in the interface of Ni/Co oxide nanoparticles assembled as a nanorod bundle structure.

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Dissertations / Theses on the topic "Valence du Ni"

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BARBEY, LAURENCE. "Oxydes a valence mixte des systemes cu, fe, ni, co. Structures et proprietes magnetiques." Caen, 1994. http://www.theses.fr/1994CAEN2039.

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Les proprietes magnetiques et structurales des oxydes de cuivre ybaco#2##xcu#xo#5 et ybacocu#1##xfe#xo#5, de structure type 112, ont ete etudiees. L'influence des elements co#2#+, co#3#+, cu#2#+ et fe#3#+ sur le magnetisme de ces phases a ete mise en evidence grace aux etudes par diffraction neutronique, par spectroscopie mossbauer et grace a des mesures de susceptibilite magnetique. Une correlation entre la distorsion des pyramides et l'orientation des spins de ces elements, determinee par diffraction neutronique, a ainsi ete etablie. Dans ces phases, le co#3#+ adopte la configuration electro

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Wieling, Sönke. "Besetzte und unbesetzte elektronische Struktur von geordneten Dünnschichtverbindungen der Seltenen Erden Eu und Yb mit den Übergangsmetallen Pd und Ni." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2003. http://nbn-resolving.de/urn:nbn:de:swb:14-1064490965781-71077.

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The present thesis deals with the occupied and unoccupied electronic states of intermetallic compounds of the rare-earth metals (RE) Eu and Yb with the transition metals Pd and Ni. The compounds were prepared in-situ as epitaxial thin films on single-crystalline substrates. For comparison, the experiments were extended to a Ba/Pd compound, which was prepared in the same way. All samples were characterised by low-energy electron diffraction (LEED), photoelectron spectroscopy (PES) and inverse photoemission (IPE). For the IPE experiments an appropriate spectrometer was built. It consists of a co

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Dahab, Hassan-Dahab. "Synthèse, cristallochimie et propriétés physiques de nickelates de terre rare (La, Nd) de structure dérivée de la perovskite à degré d’oxydation inusuel." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0047.

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Ces travaux qui s’inscrivent dans le cadre d’une collaboration entre l’ICMCB et l’institut Néel portent sur les nickelates (RE1-xSrxNiO2 ou RE = La et Nd) sous forme de poudres. Dans le cadre de cette thèse je présente la synthèse et design chimique de ces nouveaux matériaux par voie chimique innovante, incluant la chimie douce (voie citrate – nitrate), la synthèse sous haute pression d’oxygène (PO2 < 650 bars) (phases RENiO3) à haute température (T = 900°C) et enfin la réduction topochimique utilisant l’hydrure de calcium CaH2 à basse température (T<300°C), dans le but de stabiliser le

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Cushman, Christopher Scott. "Destruction of chlorinated hydrocarbons by zero-valent zinc and bimetallic zinc reductants in bench-scale investigations." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1398342299.

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Pan, WenLih, and 潘文立. "Crystalline Structure, Mixed Valence States, and Magnetic Behavior in Single Crystalline Fe-Ni-O Thin Films." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/22201701488253251244.

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碩士<br>國立中正大學<br>物理系<br>92<br>In order to understand the structural transformation of the Fe - Ni - O mixture film formations, we use (MBE) molecular beam epitaxy to generate a series of Fe Ni O on MgO(001) substrate. During it’s developing process, we maintain its temperature at 250 0C and film in 1000  thickness. Regarding the film measurement, we use the x-ray diffraction instrument to measure the film’s crystal lattice constant transformation. We also use x-ray absorption spectroscopy to measure film’s electronic structure,and VSM to measure the film’s magnetic. Our laboratorial measureme

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Hesse, Hans-Josef. "Hochdruckuntersuchungen zur Eu-Valenz in intermetallischen EuM2Ge2-Systemen (M = Ni, Pd, Pt) /." 1997. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007747511&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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張吉辰. "The study of decoloration of azo dye Acid Blue 113 wastewater using nanoscale zero-valent iron and Fe/Ni and Fe/Zn." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/85602084392761210663.

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碩士<br>弘光科技大學<br>環境工程研究所<br>97<br>In general, effluents discharged from dye manufacturing and industries with strong color and high level of chemical oxygen demand (COD) which can not meet the stricter Taiwan’s Nation Effluent Standard by convention wasterwater treatment system. Thus, it demands urgently to develop an economic and effective technique for increase of color removal of wastewater treatment efficiency and time-saving operation. This study proposed decoloration of azo dye Acid Blue 113 wastewater using nanoscale zero-valent iron (NZVI) and bimetal Fe/Ni, Fe/Zn by considering the ope

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Cloutier, Jean-Philippe. "Complexes NCN de Ni(II) et Ni(III) : synthèse, caractérisation et rôle dans le mécanisme de couplage C-O, C-N et C-halogènes." Thèse, 2018. http://hdl.handle.net/1866/21694.

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Books on the topic "Valence du Ni"

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editor, Reyero Carlos, ed. Ni clásicos ni modernos: Buscando la verdad en el Museo de Bellas Artes de València. Generalitat Valenciana, 2020.

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Félix, Báez-Jorge. Olor de santidad: San Rafael Guízar y Valencia: articulaciones históricas, políticas y simbólicas de una devoción popular. Universidad Veracruzana, 2006. http://dx.doi.org/10.25009/uv.282.1401.

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Esta obra nos introduce a las articulaciones históricas, políticas y simbólicas de una devoción popular: la que se dedica a Rafael Guízar y Valencia, y constituye la esperada biografía de este varón al que por muchos años se tuvo por santo y que terminó siendo canonizado. Sin embargo Báez-Jorge no se detiene ni es limitado por la fama de santidad, sino que busca lo que tuvo de ser de carne y hueso.

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Baltasar Rull Villar, Alcalde de Valencia (1951-1955): "ni lo he solicitado ni lo he apetecido", la Valencia de los años cincuenta. B. Torralba, 2015.

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Ni contigo ni sin ti: Socialismo y republicanismo histórico en la Valencia de los años treinta. Institució Alfons el Magnànim, 2015.

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Fortich-Navarro, Mónica Patricia. La mujer del porvenir : Concepción Arenal Ponte. Universidad Libre Sede Principal, 2022. http://dx.doi.org/10.18041/978-958-5578-95-1.

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Concepción Arenal Ponte (Ferrol, España, enero 31 de 1820-Vigo, España, 4 de febrero de 1893). Abogada, poeta, ensayista y periodista cuya obra se inscribe dentro del Realismo literario, es precursora del feminismo español con sus escritos y acciones sociales en defensa de los derechos y la dignidad de las mujeres. No es difícil imaginar las angustias de su tiempo. La literatura nos da la licencia, lo que siguen son los detalles de vida, los lugares, las personas. Primero una biblioteca y el contacto con los libros, luego el plan, las injusticias y carencias de muchas mujeres y el ritual de la

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Book chapters on the topic "Valence du Ni"

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Ammarguellat, C., C. Godart, P. Haen, and G. Krill. "Physical Properties of CeM2Si2 (M = Mn, Fe, Co, Ni, Cu)." In Theoretical and Experimental Aspects of Valence Fluctuations and Heavy Fermions. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0947-5_66.

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Janaki, J., and G. V. Subba Rao. "Studies on ZrSiS and ZrMSiAs(M=Cu,Ni) Phases with the PbFCl Structure." In Theoretical and Experimental Aspects of Valence Fluctuations and Heavy Fermions. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-0947-5_124.

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Zou, Zheng Guang, Yi Wu, Fei Long, Wen Wu Xu, and Dong Ye Yao. "Effects of Mo(Ni) on Valence Electron Structures of TiC/Fe Cermets." In High-Performance Ceramics V. Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/0-87849-473-1.1119.

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Canich, J. M., and G. L. Gard. "Synthesis of High-Valent Fluorides, Oxide Fluorides and Fluorocomplexes of Fe, Co, NI." In Inorganic Reactions and Methods. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145180.ch172.

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Kakizaki, A., K. Ono, and Y. Saitoh. "Spin-resolved Photoemission of Valence Band and Core Level Satellites of Ni." In Proceedings of the 11th International Conference on Vacuum Ultraviolet Radiation Physics. Elsevier, 1996. http://dx.doi.org/10.1016/b978-0-444-82245-1.50079-0.

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Lal, Pyare. "An Advanced Study on Temperature Affected Electro-optic Properties of In0.73Al0.07Ga0.20As/InP in Fiber-optic Communications under Bi-modes." In Intelligent Technologies for Scientific Research and Engineering. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815079395123010007.

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This fundamental research work has aimed to investigate an advanced study on temperature-affected electro-optic characteristics of In0.73Al0.07Ga0.20As/. In Pheterointerface nanostructure in fiber-optic communication systems underpolarizing transverse bi-modes. In this advanced computing, under the various effects of temperatures, the various energies values of C-V(Conduction-Valence),quasi-Fermi sublevels with the various values of carriers of charge (in cm-3) have been illustrated curvedly. Next, the temperature-dependent computing performances of NI(Near Infrared) material gains within the photon's wavelength and concentration values of carriers under polarizing transverse bi-modes have been investigated graphically in this chapter. In addition, temperature-influenced performances of ROFs (Relaxation Oscillation Frequencies) in Hz with various current values in Acm-2 have been computed graphically. Further, the graphical performances of peak RIC (Refractive Index Change) with various temperature values for both polarize TE & TM-modes. In the computational investigation through the results, the crest values of NI-material gain amplification have been found corresponding to two peaks at the photon's wavelengths ~ 1331 nm and 1551 nm for various effects of temperatures under TE-mode. Although, under TM-mode, the crest value of NI-material gain amplification has been found,corresponding to a single peak at the wavelength ~ 1331 nm for various effects of temperatures. The NI-emitting light of peak intensity emitted by the proposed nanoscale-heterogeneous junction-based nanostructure of wavelengths ~ 1331 nm and 1551 nm has been largely utilized in the FCs (Fiber-optic Cables) based NItelecommunications and several NI-therapies by TIM (Total Internal-reflection Method) with minimal attenuation loss of appropriate NI-signals (in dB km-1) on account of no dispersions, no scattering and no absorptions in the emerging and advanced nanotechnology, medical nanosciences and nanoscale-biotechnology.

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Moná Ramírez, Daniela. "Gloria Valencia de Castaño tradición y trasgresión en voz de la primera dama de la radio colombiana, 1951-1966." In Ni calladas ni sumisas. Trasgresión femenina en Colombia, siglos XVII – XX. Editorial Uniagustiniana, 2021. http://dx.doi.org/10.28970/9789585498662.04.

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Este estudio se ocupa de la participación de Gloria Valencia de Castaño en la radiodifusión colombiana entre el comienzo de la década de 1950 y mediados de la década de 1960. Valencia de Castaño es conocida como “la primera dama de la televisión colombiana”. Hoy en día siguen siendo muchas las personas que la recuerdan por su aparición en programas como “Carta de Colombia” (RTI Televisión, 1970-1979) y “Naturalia” (RTI, 1974-1993). Aun cuando fue su participación en la televisión lo que la posicionó en la memoria de los colombianos, este capítulo postula que su triunfo en la pantalla chica es “la puntada final” de una carrera adelantada y consolidada en la radio. Analizamos la voz femenina en la radio en general y, específicamente, la importancia que tuvo el quehacer radiofónico de Valencia de Castaño para abrirle espacios a la participación de mujeres en contextos tradicionalmente masculinizados. Nuestras principales fuentes documentales son registros de los programas radiales “Cosas de mujeres” (1951-1955) y “El espacio de Gloria” (1965-1966). Este material fue producido y difundido en su momento por la HJCK: el mundo en Bogotá, una de las primeras emisoras culturales independientes en el país y donde Valencia era la principal voz femenina.

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Heberer, Neil, Chi-Herng Hu, and Liviu M. Mirica. "High-Valent Ni Coordination Compounds." In Comprehensive Coordination Chemistry III. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-08-102688-5.00104-5.

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Tiwari, Ashish, R. H. Talwekar, and Ravi Kumar. "Theoretical Analysis and Design of Microphotodiodes Material for Artificial Retina Implant." In Nanoelectronics Devices: Design, Materials, and Applications Part II. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815179361123010005.

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As a typical member of two-dimensional TMDs, molybdenum disulfide (MoS2 ) has excellent carrier mobility, a sizable surface area, thermal stability, and optoelectronic features. Due to its tunable bandgap, strong valence–conduction band bonding, and use in optoelectronic sensors, photodiodes, and phototransistors, MoS2 has emerged as a possible substitute for graphene. For better optoelectronic properties, MoS2 -based monolayers and crystals have recently been investigated using a variety of heterostructures, including MoS2 /graphene, MoS2 /CNT and MoS2 /WS2 . It was also mentioned that MoS2 phototransistors and sensors had poor light sensitivity because of their insufficient ability to absorb light. The right choice of material is essential for biomedical implants, including retinal implants, neuroprosthetic implants, and others where photodiodes are used to generate electrical currents in reaction to incident light Au-based nanoparticles and nanoarrays have been added to the MoS2 monolayer to address the low absorption problem. For increased quantum efficiency, MoS2 monolayers based on solar cells and light-emitting diodes have also recently been created. In some of the other research, other transition metal (TM) atoms, such as Au, Ag, Cu, Nb, Tc, Ta, Re, Co, Ni, Fe, and Mn, were substituted into the monolayer of MoS2 , enhancing the material's electrical, magnetic, electrocatalytic, and gas adsorption capabilities. The combined electrical and optical properties of TM-doped and alkaline metal (AM) doped MoS2 bulk layers haven't received much attention, though. In this study, the effects of doping MoS2 bulk layers with TM atoms (Au, Ag, and Cu) and AM atoms (Na, Li) were investigated using first-principles DFT calculations. We investigated the density of states (DOS), band structures, structural features, optical conductivity, absorption, and reflectivity of five different doped MoS2 bulk layers. The results show that AM atom doping narrows the MoS2 bulk layer's bandgap more than TM doping. Bandgap values ranged from 1.42 eV for the undoped MoS2 layer to 0.609 eV for the Li-MoS2 layer. Additionally, it was discovered that bulk layers of MoS2 doped with AM had higher optical conductivity and absorption qualities and lower reflectivity. In applications of MoS2 - based photodiode/phototransistor sensors, doping of AM atoms may show to be a successful substitute for conventionally used TM (Au) doped arrays.

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Conference papers on the topic "Valence du Ni"

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Kinyanjui, Michael. "Nature and origin of the spectral features observed in the valence energy loss of Li-Mn-Ni-O spinel oxides spectra with respect to Mn valency changes." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.1200.

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SEIDOU, Abdul Herrim. "Differential thermal analysis to assist the design of corrosion-resistant high entropy alloys for laser powder bed fusion." In Material Forming. Materials Research Forum LLC, 2024. http://dx.doi.org/10.21741/9781644903131-40.

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Abstract. In this study, Al, Cr, Fe, Mn, and Ni are selected and pure elemental powders were used to prepare several medium entropy alloys (MEAs) and high entropy alloys (HEAs). Differential Thermal Analysis (DTA) is used as a tool for pre-screening of the compositions suitable to design corrosion-resistant alloys for Laser Powder Bed Fusion (LPBF). The advantage of DTA lies in the precise temperature control and in the small quantity of powder necessary to perform the test in near-equilibrium conditions. The powder mixtures were heated up to 1550°C, fully melted, and then cooled down to room

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Punanova, Svetlana. "ORE CONCENTRATIONS OF METALS IN NAPHTHIDES OF HYPERGENESIS ZONE: ASSESSMENT AND ENVIRONMENTAL ASPECT." In GEOLINKS International Conference. SAIMA Consult Ltd, 2020. http://dx.doi.org/10.32008/geolinks2020/b1/v2/17.

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The study examines the formation of secondary-altered crude oils associated with the processes of modern or ancient hypergenesis. As a result of geological processes during intense upward movement of the earth's crust, oil undergoes physical weathering, inorganic oxidation, washing out with water, biodegradation and sulfurization, and turn into heavy oils and hard bitumen. In zones of hypergenesis, the loss of light fractions occurs and the absolute concentration of trace elements (TE) associated with resinous-asphaltene components, such as V, Ni, Co, Mo, Cr, Cu, etc. sharply increases. In add

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Codreanu, Liviu. "Chromium bioaccumulation potential of edaphic cyanobacterium nostoc linckia grown on multimetallic systems." In 5th International Scientific Conference on Microbial Biotechnology. Institute of Microbiology and Biotechnology, Republic of Moldova, 2022. http://dx.doi.org/10.52757/imb22.16.

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Over the past few decades, chromium contamination of both terrestrial and aquatic ecosystems has increased as a result of various anthropogenic activities. In this regard, various useful and practical remediation technologies have been emerging to control chromium content in water, soil and other resources. Chromium remediation through microorganisms may be the best technology currently available for cleaning up Cr contaminated sites. These technologies using biological agents are cheaper, safer and ecofriendly than chemical treatment methods. Cr exists in several oxidation states, but the mos

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Hameed, Areeba, Khulood Logade, Naba Ali, et al. "Highly active Bifunctional Lamo3 (M=Cr, Mn, Fe, Co, Ni) Perovskites for Oxygen Reduction and Oxygen Evolution Reaction in Alkaline Media." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0106.

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Lanthanum based electrocatalytically active perovskites, LaMO3 (M=Cr, Mn, Fe, Co, Ni), were synthesized using a single step solution combustion synthesis technique. The perovskites showed exceptional performance for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline medium. Based on the experimental results and literature survey, it is suggested that the exceptional activity of Mn and Co based lanthanum perovskite catalyst could be due to the optimum stabilization of reaction intermediates involved in the rate-determining step (RDS) of ORR/OER. According to crystal

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Manabe, Toshio, Masahiro Yamashita, Takuya Kawashima, et al. "Competition between electron correlation of NiIIIstates and electron-phonon interaction of PdII-PdIVmixed-valence states in quasi-one-dimensional halogen-bridged mixed-metal complexes, Ni 1- x Pd X (chxn) 2 Br 3." In Optical Science, Engineering and Instrumentation '97, edited by Z. Valy Vardeny and Lewis J. Rothberg. SPIE, 1997. http://dx.doi.org/10.1117/12.279273.

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Chen, H. C., Q. Z. Jiang, X. L. Lu, and L. Chen. "Doping Modification Of Photorefractive Crystal Potassium Sodium Strontium Barium Niobate." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/cleo_europe.1996.ctuk75.

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During recent year, the photorefractive materials are attractive in many applications such as optical image processing and optical computing because they have more lower threshold power and easily realize phase conjugation Potassium sodium strontium barium niobate crystal is one of the best candidates. It has open structure and large structure tolerance for dopants with different valence There are two different ways to improve the photorefractive properties of the materials. 1) by adjusting the composition of materials and 2) doping cation ions. This paper is to describe the doping effects on

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Kasatenkova, Maria, Maria Kasatenkova, Nicolay Kasimov, Nicolay Kasimov, Mihail Lychagin, and Mihail Lychagin. "CHANGES IN BACKGROUND CONCENTRATIONS OF METALS IN THE SEDIMENTS OF MARSH-LAGOON LANDSCAPES OF THE WESTERN CASPIAN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b937de4b5c6.59040974.

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The last 1978-1995 transgression of the Caspian Sea caused the development of marsh-lagoon system along the Western Caspian seashore. Due to salt marshes are very vulnerable to sea-level fluctuations, complex and dynamic system, they may be considered as a regional model of rapid environmental transformation. Changing conditions of migration in the soils of marsh-lagoon landscapes during the sea-level rise influenced on the migration of elements of variable valency, primarily Fe and Mn, but also Zn, Cu, Pb, Ni, Co, leading to their mobilization in slightly alkaline and neutral reducing conditi

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Kasatenkova, Maria, Maria Kasatenkova, Nicolay Kasimov, Nicolay Kasimov, Mihail Lychagin, and Mihail Lychagin. "CHANGES IN BACKGROUND CONCENTRATIONS OF METALS IN THE SEDIMENTS OF MARSH-LAGOON LANDSCAPES OF THE WESTERN CASPIAN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4315901d72.

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Abstract:

The last 1978-1995 transgression of the Caspian Sea caused the development of marsh-lagoon system along the Western Caspian seashore. Due to salt marshes are very vulnerable to sea-level fluctuations, complex and dynamic system, they may be considered as a regional model of rapid environmental transformation. Changing conditions of migration in the soils of marsh-lagoon landscapes during the sea-level rise influenced on the migration of elements of variable valency, primarily Fe and Mn, but also Zn, Cu, Pb, Ni, Co, leading to their mobilization in slightly alkaline and neutral reducing conditi

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Muñoz Suárez, Daniel, María Vanessa Galindo Ramírez, and Yair Martínez Martínez. "La evaluación formativa a través de los medios formales, semiformales y no formales, el caso de expresiones y polinomios algebraicos." In IN-RED 2019: V Congreso de Innovación Educativa y Docencia en Red. Editorial Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/inred2019.2019.10488.

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El presente trabajo describe la relación entre la satisfacción percibida por los estudiantes con los medios de evaluación, en función de los logros y el rendimiento académico al adquirir competencias y formación en expresiones y polinomios algebraicos. Es por lo anterior, que la evaluaciòn se convierte en el eje fundamental de la estrategìa metodològica para la enseñanza-aprendizaje, requiriendo señalar que ambas no tienen objetivos separados ni ausentes una de la otra; es decir, que no se entenderán como la consecución de un procedimiento que está constituido por la planeación, la ejecución y

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