The aim of this work was to demonstrate that the average chemical structure asphaltenes a crude oil sample is unique compared with crudes other wells from Colorado Oil field, Colombia. Six oils extracted several depths (from 2112 6178 ft) were studied; these have very critical problem deposition paraffins and low concentrations (<1% w/w), although been found them in organic deposits. To research problem, first, we studied asphaltenes; information will be used future understand influence...

In the present work, chemical changes in asphaltenes, solid residues, when they are treated with hydrogen plasma were analyzed. H2 was characterized by presence of electrons, H+ and H2+ ions, at kinetic energies as low 30 eV. These species can interact asphaltenes to produce structure different mechanisms such bond cleavage, recombination, condensation. Asphaltene samples exposed treatment times (up 120 min). The optical emission spectroscopy (OES) well products created reactions...

Article TRANSFORMATIONS OF 4-N-ARYLAMINO-4-(8-QUINOLINYL)-I-BUTENES AND 3-ARYL-2-(8-QUINOLINYL)-4-THIAZOLIDINONES was published on April 1, 2001 in the journal Heterocyclic Communications (volume 7, issue 2).

Optical emission spectroscopy was applied for plasma characterization during erosion of substrates asphaltene. The amount 100 mg asphaltene carefully to an electrode and exposed air glow discharge at a pressure 1.0 Torr. generated in stainless steel chamber by AC generator with frequency 60 Hz output power about W. electron temperature found be 6.88 eV, the ion density is 3.5 × 1016 cm−3. As plasma, surface etched. from molecular bands CS2, O3, N2+, NO, O2, CS, S2, CN, C7H7, C2, H2, C2−,...

Synthesis of new dihydrospiro[quinoline-2,4-piperidines] by a two-step synthetic route based on 4-piperidone imine reactivity is reported. An acetyl migration in 1-acetyl-1-benzyl-4-methyl-3,4- under debenzylation conditions (HCOONH4 / Pd C MeOH) found. Keywords: spiropiperidines, intramolecular alkene friedel-crafts alkylation, debenzylation,

Optical emission spectroscopy (OES) was applied for plasma characterization during the erosion of asphaltene substrates. An amount 100 mg carefully to an electrode and exposed air-plasma glow discharge at a pressure 1.0 Torr. The generated in stainless steel chamber by ac generator frequency 60 Hz, output power 50 W gas flow rate 1.8 L/min. electron temperature ion density were estimated be 2.15±0.11 eV (1.24±0.05) × 1016 m-3, respectively, using double Langmuir probe. OES employed observe...

Absolute total and differential cross sections have been measured for neutral Li formation in single collisions of ${\mathrm{Li}}^{+}$ on ${\mathrm{H}}_{2}$ from 1 to 5 keV. Total were obtained by direct integration are good agreement with earlier cross-sectional measurements. A comparison the plotted as a function reduced variables $\ensuremath{\theta}\mathrm{sin}\ensuremath{\theta}d\ensuremath{\sigma}/d\ensuremath{\Omega}$ vs $E\ensuremath{\theta}$ is also presented maximum curves present...

Small-Angle X-ray Scattering (SAXS) technique was used to characterize the structure of Asphaltene aggregates as a function its concentration in Toluene solutions. ranged from 0.01 1% w/v. Solid Asphaltenes were obtained Colombian heavy crude oil following ASTM D6560-12 standard method by precipitation with n- heptane. Structural properties interpreted terms radius gyration (Rg) and power-law exponents (d). The spectra for Asphaltene-Toluene systems allowed&nbsp; us explore two regions. At...

The multiphoton dissociation-ionization of tetracene at 355 nm using 6.5 nanosecond laser pulses, with and without argon as a carrier gas (CG), has been studied compared. Ion fragments were analyzed in time-of-flight mass spectrometer separated according to their mass-to-charge ratio (m/z). results show that the dynamic photodissociation ~1010 W⋅cm-2 intensities is strongly influenced by CG. suppression fragmentation channels primarily those relating formation CHm+ (m = 2, 4), C2H4+ C5H4+2...

Este artículo analiza la composición religiosa del estado de Yucatán desde 1990 a 2020, centrándose en las iglesias cristianas no católicas una perspectiva demografía histórica. Utilizando como fuentes los censos nacionales población 1990, 2000, 2010 y investigación examina ubicación geográfica (diferenciando el centro urbano –Mérida– con resto estado), sexo edad. Sostenemos que hegemonía católica estuvo ligeramente amenazada finales siglo xx principios xxi por proliferación nuevas ofertas...

El artículo examina la vida social de tres revistas pentecostales pioneras en Chile, que circularon entre las décadas 1910 y 1920: Chile Evangélico, Pentecostal Fuego Pentecostés. Se parte premisa dichas publicaciones no solamente representan fuentes documentales, pueden ser consultadas por los estudiosos del hecho religioso para “extraer” información sus investigaciones concretas, sino concebidas como “artefactos culturales” con agencia, articularon relaciones, saberes, experiencias...

Este artículo presenta una caracterización de las asociaciones mujeres y dejóvenes en Colombia la primera mitad del sigloXX, cuales sirvieron comoestrategias fundamentales a dicha opción religiosa para ganar un espacio laesfera pública nacional posicionarse frente los heraldos poder hegemónico,como también extender su ideario entre población. A través categoría“sociabilidad” se busca dilucidar el grado incidencia evangélicos duranteel periodo, así como manera que sus agendas religiosas...

In the present study, optical microscopy in stereoscopic mode coupled to laser- induced p-breakdown spectroscopy (μ-LIBS) was applied for analysing HP-40 steel samples. microLIBS is a new growing area that employs low energy laser pulses generation of plasma emission, which allow realization localized microanalysis [1]. This LIBS instrument used surface characterization samples spectral range from 356 401nm. Elements such as Cr, Ni, Fe, Nb, Pb, Mo, C, Mn and Si were investigated. The results...

This article presents the photo induced dehydrogenation of a cooled molecular jet coronene, exposed to 266 nm laser radiation. Using unfocused radiation 1064 nm, synchronously coupled with ionization pulses, system recently developed. Molecular beams were produced by desorption coronene. Analysis photoproducts made time-of flight mass spectrometer showed that wide variety ionic species formed; more than 300 different observed. The results carbon clusters C+n n up 24 as well carbon/hydrogen...

Este artículo analiza la sociabilidad intelectual presbiteriana articulada al periódico El Evangelista Colombiano. periodo de estudios inicia con fundación publicación en 1912 y cierra salida del director Alexander Allan 1945. En términos metodológicos, se examinó ciertos aspectos materiales —impresión, distribución, canjes—; igual que contenidos relacionados participación vida pública —cartas, informes, artículos—. Datos complementados autobiografía Allan, relato pone contexto su gestión...

Abstract Low-pressure DC plasma discharges sustained in a glow discharge of CH2Cl2 are studied. The conditions were: 1.0 Torr, 20 W and 12 l/min. electron temperature ion density were estimated to be 5.47±0.27 eV (1.57±0.06)×1016 m−3, using double Langmuir probe. diagnostic the species was made by optical emission spectroscopy spectrometer. main identified at 339.61, 358.60 377.96 nm for C2(c’1Πg–b1Πu); 392.50 C3(‘Πu–‘); 431.42 CH(A2Δ–X2Π); 778.28 Cl; 657.80 C+; 471.90 487.30 H2; 380.61...