Términos

Molecular breakdown effected by the action of heat; the chemical process by which a compound is converted into one or more products initiated by this thermal reaction.

Method of chemical analysis in which the sample is subjected to pyrolysis and the pyrolysate is then analyzed by mass spectrometry.

A method of chemical analysis in which a small sample of material is inserted into a pyrolysis unit before subsequently analyzed using the techniques of gas- chromatography and mass spectrometry in tandem. This method enables a reproducible characterisation of the macromolecular complexes found in virtually all materials in the natural environment.

Branch of metallurgy which extracts metals from raw materials at high temperatures using processes of reduction, oxidizing, refining.

A major class of silicate minerals and its members which include about twenty mineral species, among them diopside, rhodonite, jadeite. Pyroxenes are found in many igneous and metamorphic rocks. They are distinguished from the second major class of silicate minerals, amphiboles, by their cleavage planes, characterized by prismatic cleavage at nearly 90 degrees, and a structure of single chains of SiO4 tetrahedra as distinct from amphiboles' double chains.

Genus containing around 30 species of medium sized trees native to coastal and mildly temperate regions of the Old World, from western Europe, north Africa, and Asia. It is one of the most important fruit trees of the world and is cultivated in all temperate-zone countries of both hemispheres. Valued for fleshy edible fruit (a pome), typically having a broad base and tapering or constricted towards the stalk, and having sweet taste, soft texture, and distinguished by the presence of hard cells in the flesh, the so-called grit, or stone cells. Pear trees are relatively long-lived (50 to 75 years), may reach considerable size unless carefully trained and pruned, and are valued for timber.

Species of medium sized, fruit-bearing tree that is probably of European origin, and has been cultivated since long before the Christian era. Thousands of varieties have been bred and named since ancient times in Europe alone. It is propagated by budding or grafting onto a rootstock. In Europe the main rootstock used is quince, which produces a dwarfed tree that fruits at an earlier age than most of the trees on pear rootstocks. The common pear was introduced into the New World by British and other Europeans as soon as the colonies were established. Also at an early date, Spanish missionaries carried the fruit to Mexico and California.

Refers to the culture associated with a city-kingdom in ancient Burma that flourished from about 1 CE to 9 CE and encompasses the southern regions Binnaka, Mongamo, Sri Ksetra, and Halingyi. Architecture in the region features vaulted temples, houses, palaces, and monasteries built of timber, roofed with tiles of lead and tin, and containing walls comprised of glazed brick. Decorative arts and crafts within households included kitchen utensils made from gold and household figurines made from gold, green glass, jade, and crystal. Cylindrical stupas or large burial urns of various dimensions adorned the periphery of the kingdom's city walls and temples.

Vasijas relativamente pequeñas y achaparradas en forma de caja y con tapa para contener cosméticos y artículos de tocador.

Tipo de vaso griego antiguo de nombre del alfarero Nikosthenes. Cuenta con una tapa abovedada con remate, un cuerpo con forma de campana invertida establecida en un tallo corto, y un pie de apoyo.

Un tipo de pyxis con una tapa plana, manilla y un cuerpo cóncavo. Es ya sea sin pies o tiene un pie de anillo que a veces se divide en tres o cuatro secciones.

Un tipo de pyxis con una forma baja y ancha, cuerpo de paredes rectas, y labio superior. Se asemeja a una caja de polvo moderna.

Un tipo de pyxis con una tapa convexa y un cuerpo cóncavo como el pyxis tipo A, pero más baja y ancha. Sólo se encuentra en figuras rojas.

Un tipo de pyxis con un cuerpo similar a la del tipo pyxis B, pero con una tapa más pequeñaenor, tapa en lugar de una tapa deslizante. Se encuentra solamente en figuras rojas.

Un tipo de pyxis que tiene una tapa con cubierta ornamental y un cuerpo en forma de cuenco apoyado en tres pies cóncavos.

Se refiere al período paleolítico en Nubia, entre aproximadamente el 15.000 a 10.000 a.C. El período se caracteriza por piedras trituradas y cuchillas que posiblemente indican experimentos en agricultura así como la presencia de cementerios y evidencia de enterramiento ritual.

Se refiere a una de las dos ramas del movimiento islámico moderno de Ahmadiyya. Esta rama mantiene la herética creencia Ahmadiyya que Ghulam Ahmad era un profeta. Los creyentes en esta secta viven principalmente en Pakistán con otras comunidades encontradas en India y Oeste de Africa y a alguna magnitud en Gran Bretaña, Europa, y los Estados Unidos. Los Qadi son una comunidad muy organizada con una base financiera considerable y son misioneros entusiastas, proselitizando Ahmadiyya como el único y verdadero Islam. Después de la fundación de Pakistán en 1947, la secta se trasladó desde Qadian, lugar de nacimiento del fundador, a Rabwah, Pakistán.

Sistema de irrigación subterráneo consistente en túneles inclinados que parten de un manantial de agua y que se encuentran conectados a la superficie por medio de una serie de ejes verticales regularmente espaciados.

Salterios del Cercano Oriente, Turquía, Africa del Norte, partes de Asia y del sudeste de Europa, con 50 a 100 cuerdas de tripa, metal o nailon, encordadas en órdenes de tres sobre una caja trapezoidal poco profunda cuyo vientre está parcialmente cubierto con piel de animal. Algunos modelos actuales tienen pequeñas palancas de bronce para controlar la tensión de las cuerdas.