scholarly journals The Commensal Real-Time ASKAP Fast-Transients (CRAFT) Survey

2010 ◽  
Vol 27 (3) ◽  
pp. 272-282 ◽  
Author(s):  
Jean-Pierre Macquart ◽  
M. Bailes ◽  
N. D. R. Bhat ◽  
G. C. Bower ◽  
J. D. Bunton ◽  
...  
Keyword(s):  
Real Time ◽  
Data Stream ◽  
High Time Resolution ◽  
Radio Sources ◽  
Survey Experiment ◽  
High Brightness ◽  
Gravitational Fields ◽  
Fast Transients ◽  
Strong Gravitational Fields ◽  
The Universe

AbstractWe are developing a purely commensal survey experiment for fast (<5 s) transient radio sources. Short-timescale transients are associated with the most energetic and brightest single events in the Universe. Our objective is to cover the enormous volume of transients parameter space made available by ASKAP, with an unprecedented combination of sensitivity and field of view. Fast timescale transients open new vistas on the physics of high brightness temperature emission, extreme states of matter and the physics of strong gravitational fields. In addition, the detection of extragalactic objects affords us an entirely new and extremely sensitive probe on the huge reservoir of baryons present in the IGM. We outline here our approach to the considerable challenge involved in detecting fast transients, particularly the development of hardware fast enough to dedisperse and search the ASKAP data stream at or near real-time rates. Through CRAFT, ASKAP will provide the testbed of many of the key technologies and survey modes proposed for high time resolution science with the SKA.

scholarly journals Ejection Phenomena in Galaxies and QSOs: Are We Going Far Enough?

1998 ◽  
Vol 164 ◽  
pp. 33-34
Author(s):  
G. Burbidge
Keyword(s):  
Observational Evidence ◽  
Active Galaxies ◽  
Radio Sources ◽  
Gravitational Fields ◽  
Strong Gravitational Fields ◽  
Compact Sources

AbstractI summarize the observational evidence which suggests: (1) that many of the compact radio sources associated with QSOs and related objects have been ejected from active galaxies so that their redshifts are not measures of their distances, and (2), that the energy emitted by compact sources is not gravitational in origin, but arises through creation processes in regions of galaxies with very strong gravitational fields.

scholarly journals LOFT-e: Localisation Of Fast Transients with e-MERLIN

2017 ◽  
Vol 13 (S337) ◽  
pp. 422-423
Author(s):  
C. R. H. Walker ◽  
R. P. Breton ◽  
P. A. Harrison ◽  
A. Holloway ◽  
M. J. Keith ◽  
...  
Keyword(s):  
Full Advantage ◽  
Real Time ◽  
Time Resolution ◽  
Observation Time ◽  
Field Of View ◽  
High Time ◽  
High Time Resolution ◽  
Radio Bursts ◽  
Raw Data ◽  
Fast Transients

AbstractThe majority of fast radio bursts (FRBs) are poorly localised, hindering their potential scientific yield as galactic, intergalactic, and cosmological probes. LOFT-e, a digital backend for the U.K.’s e-MERLIN seven-telescope interferometer will provide commensal search and real-time detection of FRBs, taking full advantage of its field of view (FoV), sensitivity, and observation time. Upon burst detection, LOFT-e will store raw data offline, enabling the sub-arcsecond localisation provided by e-MERLIN and expanding the pool of localised FRBs. The high-time resolution backend will additionally introduce pulsar observing capabilities to e-MERLIN.

scholarly journals Re-Stream: Real-time and energy-efficient resource scheduling in big data stream computing environments

2015 ◽  
Vol 319 ◽  
pp. 92-112 ◽  
Author(s):  
Dawei Sun ◽  
Guangyan Zhang ◽  
Songlin Yang ◽  
Weimin Zheng ◽  
Samee U. Khan ◽  
...  
Keyword(s):  
Big Data ◽  
Real Time ◽  
Energy Efficient ◽  
Data Stream ◽  
Resource Scheduling ◽  
Stream Computing ◽  
Efficient Resource ◽  
Computing Environments ◽  
Time And Energy

Absorption in Radio Sources of High Brightness Temperature

Nature ◽  
1963 ◽  
Vol 200 (4901) ◽  
pp. 56-57 ◽  
Author(s):  
P. J. S. WILLIAMS
Keyword(s):  
Brightness Temperature ◽  
Radio Sources ◽  
High Brightness

Abstract P466: Circadian Rhythm Disruptions in a Novel Diabetic db/db-mPer2 Luc Mouse Model

Hypertension ◽  
2017 ◽  
Vol 70 (suppl_1) ◽  
Author(s):  
Tianfei Hou ◽  
Wen Su ◽  
Ming C Gong ◽  
Zhenheng Guo
Keyword(s):  
Blood Pressure ◽  
Circadian Rhythms ◽  
Real Time ◽  
Clock Gene ◽  
Ex Vivo ◽  
Phase Advance ◽  
Luciferase Reporter ◽  
High Time Resolution ◽  
Peripheral Tissues

Db/db mouse, which lacks functional leptin receptor, is an extensively used model of obesity and type 2 diabetes. We and others have demonstrated that db/db mouse has disruptions in circadian rhythms of behavior, physiology and some clock genes. However, systemic investigations of the alterations in clock gene oscillations in multiple systems with high time resolution in this model are impeded by the impractical demand for large number of animals. To overcome this limitation, we cross bred the db/db mouse with mPer2 Luc mouse in which the clock gene Period2 is fused with a luciferase reporter thus allow real-time monitoring of the clock gene Per2 oscillations. The generated db/db-mPer2 Luc mice had the typical diabetic mellitus including obesity, hyperglycemia, hyperinsulinemia, glucose intolerance and insulin resistance. In addition, the db/db-mPer2 Luc mice also exhibited disruptions in circadian rhythms in behavior (locomotor activity), physiology (blood pressure) and metabolism (respiratory exchange ratio and energy expenditure). Using the LumiCycle system, we monitored in real-time of the Per2 oscillations in both the SCN central clock and multiple peripheral tissues ex vivo . The results showed no difference in the phase of the central SCN Per2 oscillation. However, the peripheral tissues that related to metabolism, such as liver and white adipose clocks, displayed 3.28±0.86 and 4.64±1.06 hours of phase advance respectively. Aorta, mesentery artery and kidney, organs play important role in blood pressure homeostasis, showed 0.99±0.37, and 2.12±0.4, and 2.21±0.5 hours phase advance respectively. Interestingly, no difference was observed in the lung and adrenal gland. We then investigated the Per2 oscillation in vivo by using the IVIS imaging system. Consistent with the ex vivo results, the liver Per2 oscillation were phase advanced in vivo. Our findings demonstrated that clock gene Per2 oscillations were disrupted in multiple peripheral tissues but not in central SCN. Moreover, the extent of phase advance in peripheral tissue varies largely. Our results suggest dyssynchrony of the clock oscillations among various peripheral systems likely contribute to the multiple disruptions in physiology and metabolism in diabetic db/db mice.

COMMENT ON "ANGULAR SIZE TEST ON THE EXPANSION OF THE UNIVERSE," BY M. LÓPEZ-CORREDOIRA

2011 ◽  
Vol 20 (06) ◽  
pp. 1167-1169 ◽  
Author(s):  
D. L. KHOKHLOV
Keyword(s):  
Angular Size ◽  
Radio Sources ◽  
Expansion Of The Universe ◽  
The Difference ◽  
The Universe

The results of the angular size test in the paper under comment are at variance with those for compact radio sources. The possible reason for the difference between the two results is discussed.

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