نتایج جستجو برای: blackout

تعداد نتایج: 1044  

2016
Yanpeng Li Xiang Li Hongqiang Wang Bin Deng Yuliang Qin

Radar is a very important sensor in surveillance applications. Near-space vehicle-borne radar (NSVBR) is a novel installation of a radar system, which offers many benefits, like being highly suited to the remote sensing of extremely large areas, having a rapidly deployable capability and having low vulnerability to electronic countermeasures. Unfortunately, a target detection challenge arises b...

2012
Alfredo Burlando

Determining whether power outages have significant fertility effects is an important policy question in developing countries, where blackouts are common and modern forms of family planning scarce. Using birth records from Zanzibar, this paper shows that a 2008 month-long blackout caused a significant, 20% increase in the number of births eight to ten months later. The increase is similar across...

2014
Pierre Henneaux Daniel Kirschen Pierre-Etienne Labeau

Blackouts result from cascading failure in transmission power systems. The typical development of a cascading failure can be split in two phases. In an initial slow cascade phase, an initiating contingency triggers a thermal transient developing on characteristic times much larger than the electrical time constants. This transient increases significantly the likelihood of additional contingenci...

Journal: :Journal of the experimental analysis of behavior 1994
T W Belke M L Spetch

Pigeons' choices between a reliable alternative that always provided food after a delay (i.e., 100% reinforcement) and an unreliable one that provided food or blackout equally often after a delay (i.e., 50% reinforcement) was studied using a discrete-trials concurrent-chains procedure modified to prevent choice between alternatives following a blackout outcome. Initial links were fixed-ratio 1 ...

Journal: :Clinical physiology and functional imaging 2009
Johan P A Andersson Mats H Linér Henrik Jönsson

Many competitive breath-hold divers use 'glossopharyngeal insufflation', also called 'lung packing', to overfill their lungs above normal total lung capacity. This increases intrathoracic pressure, decreases venous return, compromises cardiac pumping, and reduces arterial blood pressure, possibly resulting in a syncope breath-hold divers call 'packing blackout'. We report a case with a breath-h...

Journal: :Perception & psychophysics 1995
J F Larish G J Andersen

Gibson (1966, 1979) suggested that an important property of perception is that the observer is active. Two experiments were conducted to examine the benefits of active observation in determining dynamic spatial orientation. Subjects were presented with displays simulating locomotion through a three-dimensional environment. Active observers continuously controlled locomotion, whereas passive obs...

Journal: :Journal of the experimental analysis of behavior 1997
M McDevitt M Spetch R Dunn

In a baseline condition, pigeons chose between an alternative that always provided food following a 30-s delay (100% reinforcement) and an alternative that provided food half of the time and blackout half of the time following 30-s delays (50% reinforcement). The different outcomes were signaled by different-colored keylights. On average, each alternative was chosen approximately equally often,...

Journal: :Chaos 2007
Ian Dobson Benjamin A Carreras Vickie E Lynch David E Newman

We give an overview of a complex systems approach to large blackouts of electric power transmission systems caused by cascading failure. Instead of looking at the details of particular blackouts, we study the statistics and dynamics of series of blackouts with approximate global models. Blackout data from several countries suggest that the frequency of large blackouts is governed by a power law...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید