An accessible student-oriented approach to radiowave propagation

Propagation-the process whereby a signal is conveyed between transmitter and receiver-has a profound influence on communication systems design. "Radiowave Propagation" provides an overview of the physical mechanisms that govern electromagnetic wave propagation in the Earth's troposphere and ionosphere. Developed in conjunction with a graduate-level wave propagation course at The Ohio State University, this text offers a balance of physical and empirical models to provide basic physical insight as well as practical methods for system design.

Beginning with discussions of propagation media properties, plane waves, and antenna and system concepts, successive chapters consider the most important wave propagation mechanisms for frequencies ranging from LF up to the millimeter wave range, including:

Direct line-of-sight propagation through the atmosphere

Rain attenuation

The basic theory of reflection and refraction at material interfaces and in the Earth's atmosphere

Reflection, refraction, and diffraction analysis in microwave link design for a specified terrain profile

Empirical path loss models for point-to-point ground links

Statistical fading models

Standard techniques for prediction of ground wave propagation

Ionospheric propagation, with emphasis on the skywave mechanism at MF and HF and on ionospheric perturbations for Earth-space links at VHF and higher frequencies

A survey of other propagation mechanisms, including tropospheric scatter, meteor scatter, and propagation effects on GPS systems

"Radiowave Propagation" incorporates fundamental materials to help senior undergraduate and graduate engineering students review and strengthen electromagnetic physics skills as well as the most current empirical methods recommended by the International Telecommunication Union. This book can also serve as a valuable teaching and reference text for engineers working with wireless communication, radar, or remote sensing systems.

Signal Measurement and Estimation Techniques for Micro and Nanotechnology discusses micro, nano and robotic cells and gives a state-of-the-art presentation of the different techniques and solutions to measure and estimate signals at the micro and nano scale. New technologies and applications such as micromanipulation (artificial components, biological objects), micro-assembly (MEMS, MOEMS, NEMS) and material and surface force characterization are covered. The importance of sensing at the micro and nano scale is presented as a key issue in control systems, as well as for understanding the physical phenomena of these systems. The book also: Explains issues that make signal measurement and estimation techniques difficult at the micro-nano-scale and offers solutions Discusses automated micro-assembly, and control of micro-nano robotic devices Presents and links signal measurement and estimation techniques for micro-nano scale systems with microfabrication methods, sensors integration and control schemes Signal Measurement and Estimation Techniques for Micro and Nanotechnology is a must-read for researchers and engineers working in MEMS and control systems.

Perspectives that shatter the stereotypes and expand understanding of a complex island nation Essays by Matthew Casey, Myriam J. A. Chancy, Bethany Aery Clerico, J. Michael Dash, Christopher Garland, Sibylle Fischer, Jeff Karem, David P. Kilroy, Nadeve Menard, and Lindsay Twa Haiti has long played an important role in global perception of the western hemisphere, but ideas about Haiti often appear paradoxical. Is it a land of tyranny and oppression or a beacon of freedom as site of the world's only successful slave revolution? A bastion of devilish practices or a devoutly religious island? Does its status as the second independent nation in the hemisphere give it special lessons to teach about postcolonialism, or is its main lesson one of failure? Haiti and the Americas brings together an interdisciplinary group of essays to examine the influence of Haiti throughout the hemisphere, to contextualize the ways that Haiti has been represented over time, and to look at Haiti's own cultural expressions in order to think about alternative ways of imagining its culture and history. Thinking about Haiti requires breaking through a thick layer of stereotypes. Haiti is often represented as the region's nadir of poverty, of political dysfunction, and of savagery. Contemporary media coverage fits very easily into the narrative of Haiti as a dependent nation, unable to govern or even fend for itself, a site of lawlessness that is in need of more powerful neighbors to take control. Essayists in Haiti and the Americas present a fuller picture, developing approaches that can account for the complexity of Haitian history and culture. Carla Calarge, Boca Raton, Florida, is assistant professor of French and Francophone studies at Florida Atlantic University. Her work has appeared in French Forum, French Review, and Presence Francophone, among others. Raphael Dalleo, Delray Beach, Florida, is associate professor of English at Florida Atlantic University. He is author of Caribbean Literature and the Public Sphere: From the Plantation to the Postcolonial and coauthor of The Latino/a Canon and the Emergence of Post-Sixties Literature. Luis Duno-Gottberg, Houston, Texas, is associate professor of Caribbean studies and film at Rice University. He is the author of Solventar las diferencias: La ideologia del mestizaje en Cuba and Albert Camus, Naturaleza: Patria y Exilio. Clevis Headley, Delray Beach, Florida, is associate professor of philosophy at Florida Atlantic University. He is the coeditor of Shifting the Geography of Reason: Gender, Science and Religion.

Signal Measurement and Estimation Techniques for Micro and Nanotechnology discusses micro, nano and robotic cells and gives a state-of-the-art presentation of the different techniques and solutions to measure and estimate signals at the micro and nano scale. New technologies and applications such as micromanipulation (artificial components, biological objects), micro-assembly (MEMS, MOEMS, NEMS) and material and surface force characterization are covered. The importance of sensing at the micro and nano scale is presented as a key issue in control systems, as well as for understanding the physical phenomena of these systems. The book also:
Explains issues that make signal measurement and estimation techniques difficult at the micro-nano-scale and offers solutions
Discusses automated micro-assembly, and control of micro-nano roboticdevices
Presents and links signal measurement and estimation techniques for micro-nano scale systems with microfabrication methods, sensors integration and control schemes
Signal Measurement and Estimation Techniques for Micro and Nanotechnology is a must-read for researchers and engineers working in MEMS and control systems."

The Black male scholars within this important book are painfully aware that the brutal murder of George Floyd was not due to a few "bad apples." They understand that they are perceived as "threats" and "criminals" within a distorted white imaginary that is embedded with processes of mythopoetic construction, racial capitalism, and a deep anti-Black male social ontology. Edited by prominent philosopher George Yancy, Black Men from behind the Veil: Ontological Interrogations emphasizes the importance of Black male epistemic agency and courage to speak the truth regarding an America that values Black male life on the cheap and that attempts to control the movement of Black men, their capacity to breathe, and their being through anti-Black technologies of surveillance, confinement, policing, and white nation-building. There is no single monolithic Black male voice that dominates this crucial and necessary text. Each voice speaks of pain behind the Veil, revealing narrative specificity and an important recursive truth: Black men, within the white American psyche, are both necessary and yet disposable. The existential and sociohistorical weight of this truth is made painfully clear through the voices of these Black men.

This collection gives George Yancy's transformative work in social and political philosophy and the philosophy of race the critical attention it has long deserved. Contributors apply perspectives from disciplines including philosophy, sociology, education, communication, peace and conflict studies, religion, and psychology.

Le micro-assemblage consiste a realiser une sequence d'operations elementaires conduisant a l'obtention de micro-composants constitues de differentes pieces (dimensions comprises entre 1 um et 1 mm). La manipulation de chacune de ces pieces necessite d'utiliser des effecteurs dedies, adaptes a leurs particularites (geometrie, dimensions, proprietes mecaniques). Differents types d'outils doivent ainsi etre utilises sequentiellement. Dans ce but, une station de micromanipulation a ete realisee. Elle est composee d'une micropince montee sur un manipulateur a trois degres de liberte et d'un systeme permettant de changer automatiquement l'extremite de la micropince (i.e. les outils). Il permet de fixer alternativement les outils a l'actionneur de la micropince ou a un magasin en utilisant une colle thermique. Celle-ci est liquefiee par chauffage ou solidifiee par refroidissement. Ce systeme de changement d'outils apporte une flexibilite notablement accrue a la station de micromanipulation et permet de realiser des operations de micro-assemblage dans des espaces restreints comme par exemple la chambre d'un microscope electronique a balayage.

"Here stands the first of a series of important collective statements on the proverbial problem of reason that once fled those spaces in which the person of color reached for a meeting. What other resources are left for those of us who rely on ideas in a world that offers few options short of violence or, worse, apathy but to transcend the struggle for recognition into the sphere of building new intellectual homes? One must read this courageous celebration of thinking and of asserting the value of intelligence."Lewis R. Gordon, President of the Caribbean Philosophical Association and Laura H. Carnell Professor of Philosophy at Temple University and Ongoing Visiting Professor at the University of the West Indies at Mona, Jamaica