Search results for "CONST"
showing 10 items of 7706 documents
Enhanced nitrogen removal of low carbon wastewater in denitrification bioreactors by utilizing industrial waste toward circular economy
2020
Abstract Aquaculture needs practical solutions for nutrient removal to achieve sustainable fish production. Passive denitrifying bioreactors may provide an ecological, low-cost and low-maintenance approach for wastewater nitrogen removal. However, innovative organic materials are needed to enhance nitrate removal from the low carbon effluents in intensive recirculating aquaculture systems (RAS). In this study, we tested three additional carbon sources, including biochar, dried Sphagnum sp. moss and industrial potato residues, to enhance the performance of woodchip bioreactors treating the low carbon RAS wastewater. We assessed nitrate (NO3−) removal and microbial community composition durin…
Effective pseudopotential for energy density functionals with higher-order derivatives
2011
We derive a zero-range pseudopotential that includes all possible terms up to sixth order in derivatives. Within the Hartree-Fock approximation, it gives the average energy that corresponds to a quasi-local nuclear Energy Density Functional (EDF) built of derivatives of the one-body density matrix up to sixth order. The direct reference of the EDF to the pseudopotential acts as a constraint that divides the number of independent coupling constants of the EDF by two. This allows, e.g., for expressing the isovector part of the functional in terms of the isoscalar part, or vice versa. We also derive the analogous set of constraints for the coupling constants of the EDF that is restricted by sp…
Solution and solid state studies with the bis-oxalato building block [Cr(pyim)(C2O4)2]− [pyim = 2-(2′-pyridyl)imidazole]
2013
The preparation, X-ray structure, and variable temperature magnetic study of the new compound {Ba(H2O)3/2[Cr(pyim)(C2O4)2]2}n·9/2nH2O (1) [pyim = 2-(2′-pyridyl)imidazole and C2O42− = dianion of oxalic acid], together with the potentiometric and spectrophotometric studies of the protonation/deprotonation equilibria of the pyim ligand and the ternary complex [Cr(pyim)(C2O4)2]−, are reported herein. The crystal structure of 1 consists of neutral chains, with diamond-shaped units sharing barium(II), with the two other corners occupied by chromium(III). The two metal centers are connected through bis(bidentate) oxalate. Very weak antiferromagnetic interactions between the chromium(III) ions occu…
DNA-binding of nickel(II), copper(II) and zinc(II) complexes: structure-affinity relationships
2013
Abstract Nickel(II), copper(II) and zinc(II) complexes with the same ligands normally display analogous coordination geometry and binding mode toward DNA. However, although qualitatively alike in structure and properties, different DNA-binding ability has often been observed. This review surveys the most recent examples of binding of the three metal ions complexed with monodentate and chelating bidentate to tetradentate ligands to DNA. An attempt has also been made to rationalize the observed trend in the values of the intrinsic DNA-binding constant, Kb, in terms of structural and chemical features.
Effects of preorganization in the chelation of UO22+ by hydroxamate ligands: cyclic PIPO– vs linear NMA–
2018
International audience; Many siderophores incorporate as bidentate chelating subunits linear and more seldomly cyclic hydroxamate groups. In this work, a comparative study of the uranyl binding properties in aqueous solution of two monohydroxamic acids, the prototypical linear N-methylacetohydroxamic acid (NMAH) and the cyclic analog 1-hydroxypiperidine-2-one (PIPOH), has been carried out. The complex [UO2(PIPO)(2)(H2O)] crystallized from slightly acidic water solutions (pH < 5), and its molecular structure was determined by X-ray diffraction. The uranyl speciation in the presence of both ligands has been thoroughly investigated in a 0.1 M KNO3 medium at 298.2 K by the combined use of four …
Rehabilitation of the severely atrophied dentoalveolar ridge in the aesthetic region with corticocancellous grafts from the iliac crest and dental im…
2016
Background The aim of this study was to assess changes in bone volume after block bone augmentation and placement of dental implants and further evaluate the aesthetic outcome of the treatment. Material and Methods 9 Patients with atrophied anterior maxilla were included in this study. They received total of 21 implants. Dimensions of the alveolar ridge were measured from cone-beam computed tomography x-rays. The bone level at the implant sites was analysed from intraoral x-rays and the aesthetic outcome was assessed from clinical photographs using a pink aesthetic score (PES) scaling. Results The mean gained horizontal bone width at the marginal crest and 5 mm apically was accordingly 2.7m…
Indoor air quality in schools of a highly polluted south Mediterranean area
2019
This study aimed at surveying lower secondary schools in southern Italy, in a highly polluted area. A community close to an industrial area and three villages in rural areas was investigated. Indoor temperature, relative humidity (RH), gaseous pollutants (CO 2 and NO 2 ), selected biological pollutants in indoor dust, and the indoor/outdoor mass concentration and elemental composition of PM 2.5 were ascertained. Temperature and RH were within, or close to, the comfort range, while CO 2 frequently exceeded the threshold of 1000 ppm, indicating inadequate air exchange rate. In all the classrooms, median NO 2 levels were above the WHO threshold value. Dermatophagoides p. allergen concentration…
El control constitucional de la justicia indígena en el Estado Plurinacional: el caso ecuatoriano
2016
El trabajo tiene por objeto estudiar las especificidades, particularidades, dilemas y desafíos que se le presentan al Órgano de control constitucional de la justicia indígena, la Corte Constitucional, al momento de realizar la evaluación constitucional de los actos de las autoridades indígenas que han resuelto conflictos internos con base en sus tradiciones ancestrales y su derecho propio; así como sus efectos para el Derecho Constitucional y el carácter democrático del Estado de Derecho. Este análisis tendrá en cuenta que esta modalidad de constitucionalismo plural quedó instaurado en el Ecuador a partir de la definición del Estado constitucional de derechos y justicia, plurinacional e int…
La convergencia de las telecomunicaciones, los medios de comunicación y las tecnologías de la información
2020
Europa vive en un punto de inflexión histórico sin parangón. El surgimiento, en el siglo XXI, de lo que se conoce como la Cuarta Revolución Industrial no oculta el hecho de que no solo las telecomunicaciones, sino también los medios de comunicación y las tecnologías de la información se enfrentan a nuevos desafíos en un escenario global. El traje original, especialmente diseñado para los medios de comunicación y las telecomunicaciones, se está volviendo pequeño como resultado de un fenómeno que ha marcado un momento decisivo entre los dos sectores, internet. En consecuencia, en el presente estudio se intenta representar los retos a los que se enfrenta el legislador ante el surgimiento de la…
Pluralismo jurídico en Bolivia. La coexistencia del Derecho indígena y el Derecho estatal en Bolivia
2016
A partir de la reforma constitucional de 1994 en Bolivia, se visibilizó a los pueblos indígenas y se reconocieron sus derechos, aunque inicialmente de manera tímida y con limitaciones establecidas inclusive por las leyes y no solo por la Constitución. Con la aprobación y puesta en vigencia de la CPE de 7 de febrero de 2009 , Bolivia se declara como un Estado unitario social de Derecho, comunitario, plurinacional, intercultural, que se funda en la pluralidad y pluralismo político, económico, jurídico, cultural y lingüístico; asimismo, reconoce expresamente la jurisdicción indígena originaria campesina a la cual coloca en igualdad jerárquica con las jurisdicciones ordinaria y agroambiental. D…