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RF bulk acoustic wave filters for communications
For years, surface acoustic wave (SAW) filters have been widely used as radio frequency front-end filters and duplexers for mobile communication systems. Recently, bulk acoustic wave (BAW) filters are gaining more popularly for their performance benefits and are being utilized more and more in the design of today's cutting-edge mobile devices and systems. This timely book presents a thorough overview of RF BAW filters, covering a vast range of technologies, optimal device design, filter topologies, packaging, fabrication processes, and high quality piezoelectric thin films. Moreover, the book discusses the integration of BAW filters in RF systems.
eBook
Great electronic gadget designs : 1900-today
Discover the most amazing gadget designs since 1900. From the Japanese Tamagotchi to the iPhone, this book charts the story of design that led to some amazing games and gadgets. We look at the needs that prompted their design, the designers responsible for breaking boundariesand the technology that made them possible.
Book
PerfectVision Founder Accused of Abuse
According to a Jan. 18 news release from PerfectVision, Fleming no longer has any involvement in the company. Conspiracy Allegations In addition to the human trafficking allegations, two women allege a conspiracy among Fleming, PerfectVision, attorney Charles Darwin \"Skip\" Davidson of Little Rock and his law firm, Davidson Enterprises PLLC, and others. [...]Perfect 10 became the largest dollar volume distributor of satellite dishes and receivers for DirecTV digital programming. According to Withrow, Fleming said the \"money I'm giving you is
Journal Article
Huawei : leadership, culture, and connectivity
\"The inspirational business story of Huawei: how to grow from start up to world leader in two decades...With over 170,000 employees in more than 170 countries and regions, serving more than one-third of the world's population, how does entrepreneur Ren Zhengfei manage a telcoms giant called Huawei? What is the secret to Huawei's global success? In 1987, a 44-year-old man founded a telecom equipment-trading firm in Shenzhen, China, with start-up capital of $5,000. In 29 years, it grew to become the largest telecoms company in the world. This book goes behind the scenes to explore the story of what Ren Zhengfei did differently, how the company he started reached the top spot, and why Huawei is known as a \"collective\" and not a private company: *Learn how this Chinese start up business became an international success *Understand the business strategy, leadership skills and management philosophy of Huawei's entrepreneurial founder *Get tips, inspiration and motivation for your own business start-up.14 years of meticulous research and 136 senior management and employee interviews reveal how Huawei's international business success lies in its ability to transform the intellectual elite into a band of soldiers with the same set of values and resolve, while at the same time preventing a culture of subservience. This fascinating story provides a unique glimpse into the machinations of one of the world's most powerful companies. \"The company serves as an example for many Chinese entrepreneurs striving to go global, and also presents valuable lessons for Western companies striving to integrate Eastern and Western values and ways of looking at business\"-- Publisher description.
Book
Towards Global Localization (Routledge Library Editions: Economic Geography)
This volume redefines the genre of sector studies. The first part of the book compares the experiences of Britain and France in the very voltaile world of high-tech industries during the 1980s. The macroeconomic regulation approach is carried over a microeconomic level in the empirical chapters through an analysis of studies of firms, each chapter written by authors well-placed to give a pan-European perspective.
‘(The authors) research a contemporary complex of themes with admirable theoretical and empirical depth and make a valubale contribution to industrial geography.’ Erdkunde
‘Essential reading for social scientists concerned for how high-tech industry is leading our world towards ever-increasing globalization.’ Environment and Planning
1. Computing and Communications in the UK and France: Innovation, Regulation and Spatial Dynamics – An Introduction Philip Cooke 2. High Technology and Flexibility Olivier Weinstein 3. Accumulation and Organization in Computing and Communications Industries: A Regulationist Approach Frank Moulaert & Erik Swyngedouw 4. Globalization and Its Management in Computing and Communications Philip Cooke and Peter Wells 5. The Regional Patterns of Computing and Communications Industries in the UK and France Erik Swyngedouw, Martine Lemattre, Peter Wells 6. The Computer Hardware Industry in the 1980s: Technological Change, Competition and Structural Change Peter Wells & Philip Cooke 7. The Telecommunications Equipment Industry: The Great Transformation Olivier Weinstein 8. Services: The Bridge Between Computing and Communications Frank Moulaert 9. Global Localization in Computing and Communications: Conclusions Philip Cooke
eBook
Efficient two-dimensional packing algorithms for Mobile WiMAX
We present the result of research, developed within Nokia Siemens Networks, to solve the downlink sub frame allocation problem in Mobile WiMAX (IEEE 802.16) technology in its full complexity, while simultaneously fulfilling real-life constraints on processing power and delay. We describe the IEEE 802.16 standard, and introduce two system models. A theoretical analysis of the two-dimensional packing problems originated by such models shows that they are both NP-hard in the strong sense. From a practical point of view, the processing budget for scheduling in the base station was estimated to be 1 ms on a state-of-the-art PC. Thus, we introduce two highly efficient heuristics that were developed to handle the system practically. A thorough computational analysis of their optimization characteristics and a system-level evaluation in realistic scenarios proved that the algorithms offer significant capacity gain in Mobile WiMAX systems that translate to increased operator revenues.
Journal Article
Arctic black carbon during PAMARCMiP 2018 and previous aircraft experiments in spring
Vertical profiles of the mass concentration of black carbon (BC) were measured at altitudes up to 5 km during the PAMARCMiP (Polar Airborne Measurements and Arctic Regional Climate Model simulation Project) aircraft-based field experiment conducted around the northern Greenland Sea (Fram Strait) during March and April 2018 from operation base Station Nord (81.6.sup.\" N, 16.7.sup.\" W). Median BC mass concentrations in individual altitude ranges were 7-18 ng m.sup.-3 at standard temperature and pressure at altitudes below 4.5 km. These concentrations were systematically lower than previous observations in the Arctic in spring, conducted by ARCTAS-A in 2008 and NETCARE in 2015, and similar to those observed during HIPPO3 in 2010. Column amounts of BC for altitudes below 5 km in the Arctic (66.5.sup.\" N; COL.sub.BC ), observed during the ARCTAS-A and NETCARE experiments, were higher by factors of 4.2 and 2.7, respectively, than those of the PAMARCMiP experiment. These differences could not be explained solely by the different locations of the experiments. The year-to-year variation of COL.sub.BC values generally corresponded to that of biomass burning activities in northern midlatitudes over western and eastern Eurasia. Furthermore, numerical model simulations estimated the year-to-year variation of contributions from anthropogenic sources to be smaller than 30 %-40 %. These results suggest that the year-to-year variation of biomass burning activities likely affected BC amounts in the Arctic troposphere in spring, at least in the years examined in this study. The year-to-year variations in BC mass concentrations were also observed at the surface at high Arctic sites Ny-Ãlesund and UtqiaÄ¡vik (formerly known as Barrow, the location of Barrow Atmospheric Baseline Observatory), although their magnitudes were slightly lower than those in COL.sub.BC.
Journal Article
Overcoming the rate–distance limit of quantum key distribution without quantum repeaters
Quantum key distribution (QKD)
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,
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allows two distant parties to share encryption keys with security based on physical laws. Experimentally, QKD has been implemented via optical means, achieving key rates of 1.26 megabits per second over 50 kilometres of standard optical fibre
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and of 1.16 bits per hour over 404 kilometres of ultralow-loss fibre in a measurement-device-independent configuration
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. Increasing the bit rate and range of QKD is a formidable, but important, challenge. A related target, which is currently considered to be unfeasible without quantum repeaters
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–
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, is overcoming the fundamental rate–distance limit of QKD
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. This limit defines the maximum possible secret key rate that two parties can distil at a given distance using QKD and is quantified by the secret-key capacity of the quantum channel
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that connects the parties. Here we introduce an alternative scheme for QKD whereby pairs of phase-randomized optical fields are first generated at two distant locations and then combined at a central measuring station. Fields imparted with the same random phase are ‘twins’ and can be used to distil a quantum key. The key rate of this twin-field QKD exhibits the same dependence on distance as does a quantum repeater, scaling with the square-root of the channel transmittance, irrespective of who (malicious or otherwise) is in control of the measuring station. However, unlike schemes that involve quantum repeaters, ours is feasible with current technology and presents manageable levels of noise even on 550 kilometres of standard optical fibre. This scheme is a promising step towards overcoming the rate–distance limit of QKD and greatly extending the range of secure quantum communications.
Twin optical fields enable a form of quantum key distribution that can exceed the secret-key capacity without using quantum repeaters and that has security independent of the measuring devices.
Journal Article
First in-Lab Testing of a Cost-Effective Prototype for PMsub.2.5 Monitoring: The P.ALP Assessment
The goal of the present research was to assess, under controlled laboratory conditions, the accuracy and precision of a prototype device (named ‘P.ALP’: Ph.D. Air-quality Low-cost Project) developed for PM[sub.2.5] concentration level monitoring. Indeed, this study follows a complementary manuscript (previously published) focusing on the in-field evaluation of the device’s performance. Four P.ALP prototypes were co-located with the reference instrument in a calm-air aerosol chamber at the NIOSH laboratories in Pittsburgh, PA (USA), used by the Center for Direct Reading and Sensor Technologies. The devices were tested for 10 monitoring days under several exposure conditions. To evaluate the performance of the prototypes, different approaches were employed. After the data from the devices were stored and prepared for analysis, to assess the accuracy (comparing the reference instrument with the prototypes) and the precision (comparing all the possible pairs of devices) of the P.ALPs, linear regression analysis was performed. Moreover, to find out the applicability field of this device, the US EPA’s suggested criteria were adopted, and to assess error trends of the prototype in the process of data acquisition, Bland–Altman plots were built. The findings show that, by introducing ad hoc calibration factors, the P.ALP’s performance needs to be further implemented, but the device can monitor the concentration trend variations with satisfying accuracy. Overall, the P.ALP can be involved in and adapted to a wide range of applications because of the inexpensive nature of the components, the small dimensions, and the high data storage capacity.
Journal Article