scispace - formally typeset
Search or ask a question
Topic

Blocking (radio)

About: Blocking (radio) is a research topic. Over the lifetime, 13786 publications have been published within this topic receiving 89784 citations.


Papers
More filters
Journal ArticleDOI
01 May 1990-Tellus A
TL;DR: In this article, the authors used the entire 7-year archive of ECMWF operational analysis and forecast data to assess the skill of the Centre's model in short and medium-range forecasting of atmospheric blocking.
Abstract: The entire 7-year archive of ECMWF operational analysis and forecast data is used to assess the skill of the Centre's model in short- and medium-range forecasting of atmospheric blocking. The assessment covers 7100-day periods, from 1 December to 10 March of all winters from 1980-81 to 1986-87, inclusive. A slightly modified version of the Legenas and Okland objective zonal index is used to quantify both observed and forecast occurrence of blocking. The study is performed on 500 hPa geopotential height and on Euro-Atlantic and Pacific blocking separately. It is found that blocking frequency is severely underestimated in medium-range forecasts; the model is, on average, reasonably skilful if the initial conditions are blocked, but blocking onset is poorly represented if it occurs more than a few days into the forecast. This inability in entering the blocking regime has a substantial impact on the systematic error of the model. DOI: 10.1034/j.1600-0870.1990.t01-2-00003.x

716 citations

Patent
31 Jul 2006
TL;DR: In this article, a portable device includes a safety feature that prevents some forms of use when the device is moving, which can be partially overridden based on a safety policy, which is managed and customized.
Abstract: A portable device includes a safety feature that prevents some forms of use when the device is moving. The device may detect its speed or movement, compare that to a threshold, and provide a response or blocking function upon exceeding that threshold. The device may be a cell phone configured to disable transmission and reception of voice/text, conceal its display screen, and disable incorporated features and functions, if the cell phone is moving faster than walking speed or the movement is uncharacteristic of walking. The blocking function may be partially overridden based on a safety policy, which can be managed and customized. The introduction of hands-free devices may serve to override a blocking function and enable other functions.

687 citations

Journal ArticleDOI
01 Jan 1950-Tellus A
TL;DR: In this paper, a comparative study of five cases of blocking action in the upper westerlies is presented with the twofold objective of obtaining a more complete description of this phenomenon and of attempting a...
Abstract: A comparative study of five cases of blocking action in the upper westerlies is presented with the two-fold objective of obtaining a more complete description of this phenomenon and of attempting a...

559 citations

Journal ArticleDOI
01 Aug 1950-Tellus A
TL;DR: The results of a semi-statistical study of 112 cases of blocking action in the upper westerlies are presented; areas of most frequent occurrence, characteristic movement and persistence, and seasonal and yearly trends of blocking activity are determined; regional precipitation and mean surface temperature anomalies associated with blocking over Europe are illustrated and compared with those produced by strong zonal flow aloft as discussed by the authors.
Abstract: The results of a semi-statistical study of 112 cases of blocking action in the upper westerlies are presented; areas of most frequent occurrence, characteristic movement and persistence, and seasonal and yearly trends of blocking activity are determined The regional precipitation and mean surface-temperature anomalies associated with blocking over Europe are illustrated and compared with those produced by strong zonal flow aloft The effects produced by variations in blocking activity upon European climatic trends are discussed The influence of blocking action upon Scandinavian glaciation and certain indications as to the role played by blocking in an ice-age climatic cycle are discussed DOI: 101111/j2153-34901950tb00339x

534 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
2021329
2020620
2019727
2018664
2017568