scholarly journals Scheduling High-Rate Unpredictable Traffic in IEEE 802.15.4 TSCH Networks

2017 ◽  
Author(s):  
Atis Elsts ◽  
Xenofon Fafoutis ◽  
James Pope ◽  
George Oikonomou ◽  
Robert Piechocki ◽  
...  
Keyword(s):  
Ieee 802.15.4 ◽  
High Rate

scholarly journals Integration and Prototyping of a Pulsed Rf Oscillator with an Uwb Antenna for Low-Cost, Low-Power Rtls Applications.

2021 ◽  
Author(s):  
Stefano Bottigliero ◽  
Riccardo Maggiora
Keyword(s):  
Low Power ◽  
Printed Circuit Board ◽  
Ieee 802.15.4 ◽  
Circuit Simulation ◽  
Low Cost ◽  
Parameter Tuning ◽  
Simulation Method ◽  
Dipole Antenna ◽  
Circuit Board ◽  
High Rate

The goal of this paper is to present a low-cost, low-power prototype of a pulsed Ultra Wide Band UWB) oscillator and an UWB elliptical dipole antenna integrated on the same Radio Frequency (RF) Printed Circuit Board (PCB) and its digital control board for Real Time Locating System (RTLS) applications. The design is compatible with IEEE 802.15.4 high rate pulse repetition UWB standard being able to work between 6 GHz and 8.5 GHz with 500 MHz bandwidth and with a pulse duration of 2 ns. The UWB system has been designed using the CST Microwave Studio transient Electro-Magnetic (EM) circuit co-simulation method. This method integrates the functional circuit simulation together with the full wave (EM) simulation of the PCB’s 3D model allowing fast parameter tuning. The PCB has been manufactured and the entire system has been assembled and measured. Simulated and measured results are in excellent agreement with respect to the radiation performances as well as the power consumptions.

scholarly journals Integration and Prototyping of a Pulsed RF Oscillator with an UWB Antenna for Low-Cost, Low-Power RTLS Applications

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6060
Author(s):  
Stefano Bottigliero ◽  
Riccardo Maggiora
Keyword(s):  
Low Power ◽  
Printed Circuit Board ◽  
Ieee 802.15.4 ◽  
Circuit Simulation ◽  
Low Cost ◽  
Parameter Tuning ◽  
Simulation Method ◽  
Dipole Antenna ◽  
Circuit Board ◽  
High Rate

The goal of this paper is to present a compact low-cost and low-power prototype of a pulsed Ultra Wide Band (UWB) oscillator and an UWB elliptical dipole antenna integrated on the same Radio Frequency (RF) Printed Circuit Board (PCB) and its digital control board for Real Time Locating System (RTLS) applications. The design is compatible with IEEE 802.15.4 high rate pulse repetition UWB standard being able to work between 6 GHz and 8.5 GHz with 500 MHz bandwidth and with a pulse duration of 2 ns. The UWB system has been designed using the CST Microwave Studio transient Electro-Magnetic (EM) circuit co-simulation method. This method integrates the functional circuit simulation together with the full wave (EM) simulation of the PCB’s 3D model allowing fast parameter tuning. The PCB has been manufactured and the entire system has been assembled and measured. Simulated and measured results are in excellent agreement with respect to the radiation performances as well as the power consumption. A compact, very low-power and low-cost system has been designed and validated.

Structure of Palladium Single-Crystal Films Prepared by Flash Evaporation onto (001) NaCl Substrates

1970 ◽  
Vol 28 ◽  
pp. 456-457
Author(s):  
L. E. Murr ◽  
G. Wong
Keyword(s):  
Single Crystal ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
High Rate ◽  
Flash Evaporation ◽  
Optimum Load ◽  
Single Crystal Films ◽  
Crystal Films ◽  
A Current

Palladium single-crystal films have been prepared by Matthews in ultra-high vacuum by evaporation onto (001) NaCl substrates cleaved in-situ, and maintained at ∼ 350° C. Murr has also produced large-grained and single-crystal Pd films by high-rate evaporation onto (001) NaCl air-cleaved substrates at 350°C. In the present work, very large (∼ 3cm2), continuous single-crystal films of Pd have been prepared by flash evaporation onto air-cleaved (001) NaCl substrates at temperatures at or below 250°C. Evaporation rates estimated to be ≧ 2000 Å/sec, were obtained by effectively short-circuiting 1 mil tungsten evaporation boats in a self-regulating system which maintained an optimum load current of approximately 90 amperes; corresponding to a current density through the boat of ∼ 4 × 104 amperes/cm2.

Rapid Freezing of Freeze-Etch Specimens

1980 ◽  
Vol 38 ◽  
pp. 752-755
Author(s):  
A. Elgsaeter ◽  
T. Espevik ◽  
G. Kopstad
Keyword(s):  
Low Temperature ◽  
Metal Surface ◽  
Relative Velocity ◽  
Thermal Contact ◽  
High Rate ◽  
Rapid Freezing ◽  
Temperature Decrease ◽  
Freeze Etching

The importance of a high rate of temperature decrease (“rapid freezing”) when freezing specimens for freeze-etching has long been recognized1. The two basic methods for achieving rapid freezing are: 1) dropping the specimen onto a metal surface at low temperature, 2) bringing the specimen instantaneously into thermal contact with a liquid at low temperature and subsequently maintaining a high relative velocity between the liquid and the specimen. Over the last couple of years the first method has received strong renewed interest, particularily as the result of a series of important studies by Heuser and coworkers 2,3. In this paper we will compare these two freezing methods theoretically and experimentally.

Why the high rate of dropout from individualized cognitive-behavior therapy for bulimia nervosa?

2001 ◽  
Author(s):  
Z. Steel ◽  
J. Jones ◽  
S Adcock ◽  
R Clancy ◽  
L. Bridgford-West ◽  
...  
Keyword(s):  
Bulimia Nervosa ◽  
Behavior Therapy ◽  
Cognitive Behavior Therapy ◽  
High Rate ◽  
Cognitive Behavior

Pruned-trellis search technique for high-rate convolutional codes

1989 ◽  
Vol 136 (5) ◽  
pp. 405 ◽  
Author(s):  
J. Sun ◽  
I.S. Reed ◽  
H.E. Huey ◽  
T.K. Truong
Keyword(s):  
Convolutional Codes ◽  
High Rate ◽  
Search Technique
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