Diagnóstico y cuadernillos de diseño de los oficios de cestería y talla en madera, macramé y tejeduría en lana de Duitama y Tópaga.

67 hojas : ilustraciones, fotografías a color.

The formation of nanotubes and nanocoils of molybdenum disulphide

This work reports the successful realization of MoS2 nanotubes by a novel intercalation chemistry and hydrothermal treatment. An inorganic-organic precursor of hexadecylamine (HDA) and molybdenum disulphide (MoS2) were used in synthesizing the nanocomposite comprising laminar MoS2 with HDA intercalated in the interlaminar spacing. The formation of MoS2 nanotubes occurred during hydrothermal treatment (HT) by a self-organized rolling mechanism. The nanotubes were observed to have dimensions 2-12 µm in length and inner diameters typically in the range of 25-100 nm. We also report the formation of amorphous nanocoils of MoS2 obtained during similar procedures.

Functionalization of lamellar molybdenum disulphide nanocomposite with gold nanoparticles

This work explores the functionalization of an organic-inorganic MoS2 lamellar compound, prepared by a Chemical Liquid Deposition Method (CLD), that has an interlamellar distance of ~5.2 nm, using clusters of gold nanoparticles. The gold nanoparticles have a mean diameter of 1.2 nm, a stability of ~85 days, and a zeta potential measured to be ζ = -6.8 mV (solid). The nanoparticles are localized in the hydrophilic zones, defined by the presence of amine groups of the surfactant between the lamella of MoS2. SEM, TEM, EDAX and electron diffraction provide conclusive evidence of the interlamellar insertion of the gold nanoparticles in the MoS2.

Nano-urchin: The formation and structure of high-density spherical clusters of vanadium oxide nanotubes

We report the observation of urchin-like nanostructures consisting of high-density spherical nanotube radial arrays of vanadium oxide nanocomposite, successfully synthesized by a simple chemical route using an ethanolic solution of vanadium tri-isopropoxide and alkyl amine hexadecylamine for 7 days at 180oC. The results show that the growth process of the NanoUrchin occurs in stages, starting with a radial self-organized arrangement of lamina followed by the rolling of the lamina into nanotubes. The longest nanotubes are measured to be several micrometers in length with diameters of ~120 nm and hollow centers typically measured to be ~75 nm. The NanoUrchin have an estimated density of nanotubes of ~40 sr-1. The tube walls comprise layers of vanadium oxide with the organic surfactant intercalated between atomic layers. The interlayer distance is measured to be 2.9 ± 0.1 nm and electron diffraction identified the vanadate phase in the VOx nanocomposite as orthorhombic V2O5. These nanostructures may be used as three-dimensional composite materials and as supports for other materials.

Pressure induced anisotropy of electrical conductivity in polycrystalline molybdenum disulfide

Anisotropic specimens of MoS2 are obtained by pressing the microcrystalline powder into special die. This inelastic compression results in a rearrangement of the disulfide micro platelets observed by Atomic Force Microscopy and reflected in the macroscopic anisotropy in electrical conductivity in these samples. The conductivity measured parallel and perpendicular to the direction of applied pressure exhibits an anisotropy factor of ∼10 at 1 GPa. This behaviour of the conductivity as a function of applied pressure is explained as the result of the simultaneous influence of a rearrangement of the micro platelets in the solid and the change of the inter-grain distances.

Evangélicos en América Latina

Considerada tradicionalmente "el continente católico" por excelencia, Latinoamérica siempre ha contado con una presencia minoritaria protestante, y en los últimos treinta años, a pesar de llegar a concentrar en su territorio a la mitad de los católicos del mundo, ha visto una acelerada diversificación del universo religioso, con una proliferación impresionante de denominaciones y grupos, cuya mayorÍa se declara "evangélica". Este proceso, con frecuencia descrito con expresión simplista "invasión de las sectas", se muestra complejo en sus características y articulado en su composición. Frente a tal crecimiento numérico, que en el año 2000 deberÍa involucrar al 20% de la población del continente, la Iglesia Católica parece oscilar entre la crÍtica al papel "alienante" de estos movimientos y la adopción de sus formas culturales celebrativas y espiritualizantes. Además, desde la mitad de los años 80, luego -y acaso como consecuencia- de tal expansión, los evangélicos empezaron a afirmar una inédita presencia polÍtica, culminada en l991 con la obtención en Guatemala del máximo cargo del Estado por parte de Jorge Serrano, primer presidente evangélico elegido en Latinoamérica. Contando con un sólido arraigo popular, los partidos y políticos evangélicos ya están difundidos en todos los paÍses, con un papel que alterna el conservadorismo milenarista, el corporativismo confesional y la concientización liberadora. Con este número especial, SIAL pretende principalmente ofrecer algunos materiales para un mejor conocimiento de este dinámico y complejo fenómeno religioso y social.

Aerial view of the Chapman College campus, Orange, California, 1966

Aerial view of the Chapman College campus, Orange, California, 1966. Looking diagonally to the northeast. Corner of North Glassell Street and Palm Avenue in lower middle, with the five original buildings just beyond. The old gymnasium is by the oval playing field and stadium. Photographed by Rene Laursen, 702 N. Grand, Santa Ana, California [No. 1499#1].

Aerial view of the Chapman College campus, Orange, California, 1973

Aerial view of the Chapman College campus, Orange, California, February 23, 1973. Looking north; athletic field and stadium in center. Photographed by "Aerial Eye Inc. - Custom Aerial Photography - 1330 Bristol S. E. #103 - Santa Ana, California 92707." [#9]

Aerial view of the Chapman College campus, Orange, California, 1973

Aerial view of the Chapman College campus, Orange, California, January, 1973. North at left; athletic field and stadium in center. Photographed by "Aerial Eye Inc. - Custom Aerial Photography - 1330 Palisades #92 - Santa Ana, California 92707." [#1]

Architectural rendering of Davis Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974 at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.

Davis Community Center and Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974 at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.

Davis Community Center and Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974, at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.

Davis Community Center and Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974 at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.

Davis Community Center and Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974, at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.

Davis Community Center and Apartments, Chapman College, Orange, California

Davis Community Center and Apartments opened September, 1974, at 625 North Grand Street, Orange, California, named in honor of Chapman College's fourth president, Dr. John L. Davis. The five two-story apartment buildings were designed by Harold Gimeno & Associates of Santa Ana and built by the J. Ray Construction Company, Inc. of Costa Mesa.