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Mostrando ítems 31-40 de 61
Dinámica de redes y el modelo del ión rígido en cristales del tipo R2MX6
(Polytechnic University of Puerto Rico, 1992-12)
The theory of lattice dynamics in the harmonic approximation and the Born and Huang's rigid-ion model are used to study ionic crystals of R2MX6 type with antifluorite structure. The rigid-ion model expresses the potential ...
Un universo de radiación
(Polytechnic University of Puerto Rico, 1998-06)
During the last two decades there has been an increase in the worrines of the people regarding the proliferation of electromagnetic fields and their effects on the human body. In this article we explain the basic principles ...
Architects and engineers: What makes the difference?
(Polytechnic University of Puerto Rico, 1997-12)
The historic dispute between architects and engineers, particularly civil engineers, is nonsense. Both professions are prestigious and dedicate themselves to covering separate and distinct aspects of the design of buildings ...
Experiencia con el proceso de mejoramiento de la calidad en una empresa manufacturera
(Polytechnic University of Puerto Rico, 1997-06)
The successful implementation of a continuous quality improvement process in a manufacturing enterprise requires that certain
vital conditions are present. It is also essential that those conditions be fully developed ...
Group technology and cellular manufacturing systems: an introduction
(Polytechnic University of Puerto Rico, 1997-12)
Global market competition is changing the nature of the present and future marketplace to a highly dynamic environment. Product variety is high and individual product demands are low. Also, customer's demand
for faster ...
Nonoccupational noise exposures and their hazards: a literature review
(Polytechnic University of Puerto Rico, 1998-06)
Noise pollution has been extensively studied during the last 30 years. Although most of the government regulations protect the vast majority of the workforce in the in the United States, they fail to consider the workers' ...
Dynamic analysis of rigid pavements and bridges under moving vibrating trucks
(Polytechnic University of Puerto Rico, 1997-12)
The computer program UPR-PAVI2 was developed to perform the dynamic analysis of a pavement slab or a bridge superstructure loaded with moving vibrating trucks. UPR-PAVI2 can model the soil, slab and truck, considering their ...
Strain gauge and micrometer instrumentation of a truss structure
(Polytechnic University of Puerto Rico, 1997-12)
This project was performed as part of the Structural Analysis courses in order to compare theoretical results of the response of simple structures with the experimental results obtained at the Structures Engineering ...
Determination of interface roughness and its correlation in amorphous-silicon/ amorphous-germanium multilayers
(Polytechnic University of Puerto Rico, 1996-06)
The importance of surfaces and interfaces of materials is increasing in many technological areas. In the microelectronic industry, for example, the J current trend is toward even faster and smaller electronic devices. ...
Perspectivas futuras de la demanda energética mundial: el enfoque social de un problema global
(Polytechnic University of Puerto Rico, 1996-06)
Future perspectives of the energy demand of the world: social focusing of a global problem This article attempts explaining the short- and long-range perspectives of energy consumption as a function of social factors such ...