Gasoline produced in Mexico by the productive company of state Petróleos Mexicanos (PEMEX) mainly uses oil-derived ethers as oxygenators to reach Mexican Regulatory ‘Framework’s octane number. An alternative complying with these regulations could be use bioethanol an oxygenate. However, a gasoline component, this affect ‘Mexico’s food markets since sugar cane, and grains are primary inputs for ...

Se documenta un afloramiento en el centro-oriente de México con ejemplar amonite cuyos rasgos morfológicos indican una nueva especie del Género Crioceratites denominada C. tepehuaense. Aunque la morfología andinus Gerth, 1925, es que mejor coincide los presente entre todos crioceratítidos conocidos, también presenta suficiente diferencia específica las costillas y espinas para apoyar especie. E...

Mexico is a large country (population 109 million) with a per capita income of US$8,300 (purchasing power parity US$12,800) in 2007, and as can be seen in Table 1, a highly stratified society [1]. In 2006, Mexico spent about 6.6% of its gross domestic product (GDP) on health care, of which 44% was public expenditure (see Table 1) [2]. Constitutionally, Mexico is a federation of 31 states and th...

Petroleum refining industry uses large volumes of water. The water demand is up to 3 m3 of water for every ton of petroleum processed (US EPA, 1980, 1982; WB, 1998). Almost 56% of this quantity is used in cooling systems, 16% in boiling systems, 19% in production processes and the rest in auxiliary operations. The water usage in the Mexican refineries is almost 155 millions m3 per year; it is 2...

As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured particulate polycyclic aromatic hydrocarbons (PAHs) and other gaseous species and particulate properties, including light absorbing carbon or effective black carbon (BC), at six locations throughout the city. The measurements were intended ...

This article challenges the tendency of the information systems literature to subsume IT innovation in processes of organizational change, either with the role of `̀ enabler'' of organizational objectives, or as an instrument appropriated by situated organizational actors. Using institutionalist theory, the relationship between information systems development and organizational transformation is...

Computing on the 21 st century is rapidly moving from the personal computer model, into a ubiquitous configuration, where technology will weave into the fabric of everyday life. These ubiquitous or pervasive computing is enabled by Wireless Sensor Networks (WSNs). Engineers deploy WSNs in a myriad applications ranging from implanted medical monitoring devices to industrial control systems. Node...

Rosenfeld and Pindell (2002, 2003) hypothesized that the Gulf of Mexico evaporated to a level below the world ocean for a brief interval during the Paleocene-Eocene. Further study and the results of recent drilling support this idea and suggest that a major change in the interpretation of the Gulf’s history may be warranted. The idea originally arose to explain several major Paleocene-Eocene pa...