The idea of using periodic magnetic fields for properly bending the trajectories of
relativistic electrons, and making them generate coherent tunable radiation, appeared
as early as the middle of the last century. Further study of this subject, concerning both
fundamentals and practice, received a new impetus at the beginning of the seventies.
Since then, a huge amount of knowledge has been accumulated in this rapidly
developing field of research, creating a new class of lasers, the free electron lasers....
Over many years, RF-MEMS have been a hot topic in research at the technology
and device level. In particular, various kinds of mechanical Si-MEMS resonators
and piezoelectric BAW (bulk acoustic wave) resonators have been developed. The
BAW technology has made its way to commercial products for passive RF filters,
in particular for duplexers in RF transceiver front ends for cellular communications.
Beyond their use in filters, micromachined resonators can also be used in
conjunction with active devices in innovative circuits and architectures.
This book is an entry-level text on the technology of telecommunications. It has been
crafted with the newcomer in mind. The twenty-one chapters of text have been prepared
for high-school graduates who understand algebra, logarithms, and the basic principles of
electricity such as Ohm’s law. However, it is appreciated that many readers require support
in these areas. Appendices A and B review the essentials of electricity and mathematics
up through logarithms.
The microstrip ring resonator was first proposed by P. Troughton in 1969
for the measurements of the phase velocity and dispersive characteristics of
a microstrip line. In the first 10 years most applications were concentrated
on the measurements of characteristics of discontinuities of microstrip lines.
Sophisticated field analyses were developed to give accurate modeling and
prediction of a ring resonator. In the 1980s, applications using ring circuits as
antennas, and frequency-selective surfaces emerged...
Họ do đó thường được sử dụng như các bộ khuếch đại chứ không phải dao động. Thải avalanche Preionized đã được sử dụng để tạo ra một plasma thống nhất. Các electron năng lượng thấp trong huyết tương có được năng lượng đủ để kích thích
Cd1-xMnxS nanoparticles (NPs) with size quantum confinement belong to the diluted
magnetic semiconductor (DMS) quantum dot (QD) class of materials that has been widely
studied in the last few years. The study of quasi-zero-dimensional Diluted Magnetic
Semiconductors (DMS), such as Cd1-xMnxS Quantum Dots (QDs), is strongly motivated due
to the localization of magnetic ions in the same places as the free-like electron and hole
carriers occurring in these nanomaterials [1,2].
This book provides an overview of the synthesis and characterization of nanocrystals.
Nanocrystals, owing to their unique behavior with reduction in size, have been a
significant part of the novel materials developed for applications such as biosensors,
optics, catalysts to semiconductor devices. Over the years, various synthesis methods
are discovered to develop nanostructures with tunable properties such as optical,
electronic magnetic and mechanical properties. The chapters in this book cover a
broad range of properties of nanocrystals synthesized for various applications....