Kevin Cortez

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Papers by Kevin Cortez

Influence of metal stress on RF MEMS capacitive switches

Sensors and Actuators A-physical, 2007

The electrical and mechanical response of radio frequency (RF) microelectromechanical systems (ME... more The electrical and mechanical response of radio frequency (RF) microelectromechanical systems (MEMS) switches depends critically on the profile of the released structure. Stress gradients within the material can significantly alter the structural profile thereby changing the spring constant and the resulting switch release times. To investigate the influence of metal stress on spring constant and release time, a series of

Growth of II-IV-V 2 chalcopyrite nitrides by molecular beam epitaxy

Journal of Electronic Materials, 2005

Synthesis of crystalline MgGeN2 thin solid films is achieved using the technique of molecular bea... more Synthesis of crystalline MgGeN2 thin solid films is achieved using the technique of molecular beam epitaxy (MBE). The details of the epitaxial process are described. The microstructures of these films are investigated by both x-ray diffraction (XRD) and cross-sectional transmission electron microscopy (XTEM). Comparison of the lattice structure with powder diffraction standards suggests the lattice structure may be orthorhombic with a high degree of texture. Morphology is evaluated by atomic force microscopy, and a periodic pattern of growth mounds is observed. A formalism for dynamical roughening is applied to quantify the mounded surface features. Mounds are found to have an average spacing of 235 nm, and the surface exhibits a saturation value of 22 nm for the root mean correlated height difference. Diffusion bias is discussed as a mechanism for the formation of surface mounds.

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Tapered LIGA HARMs

Journal of Micromechanics and Microengineering, 2003

... Microeng. 8 293300 [7] Tabata O, You H, Matsuzuka N, Yamaji T, Uemura S and Dama I 2002 Movi... more

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Drafts by Kevin Cortez

Teorias del todo - John D Barrow.pdf

En el corazón del Universo se encierra un secreto matemático y la clave para desentrañarlo es la ... more En el corazón del Universo se encierra un secreto matemático y la clave para desentrañarlo es la Teoría del Todo, una propuesta única y global que explique las leyes de la naturaleza y de la cual pueda derivarse con lógica irrefutable el conocimiento de todas las cosas que nos rodean. En este libro, escrito con un estilo y una claridad inusuales, John D. Barrow, uno de los cosmólogos más reconocidos del mundo, conduce al lector hacia un apasionante viaje desde la creación de los viejos mitos hasta las últimas teorías sobre el big bang, las supercuerdas, los agujeros de gusano, los universos bebé y el misterio cuántico del tiempo.

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