9,675 research outputs found
Formation of Black Holes from Collapsed Cosmic String Loops
The fraction of cosmic string loops which collapse to form black holes is
estimated using a set of realistic loops generated by loop fragmentation. The
smallest radius sphere into which each cosmic string loop may fit is obtained
by monitoring the loop through one period of oscillation. For a loop with
invariant length which contracts to within a sphere of radius , the
minimum mass-per-unit length necessary for the cosmic string
loop to form a black hole according to the hoop conjecture is . Analyzing loops, we obtain the empirical estimate for the fraction of cosmic string
loops which collapse to form black holes as a function of the mass-per-unit
length in the range . We
use this power law to extrapolate to , obtaining the
fraction of physically interesting cosmic string loops which
collapse to form black holes within one oscillation period of formation.
Comparing this fraction with the observational bounds on a population of
evaporating black holes, we obtain the limit on the cosmic string mass-per-unit-length. This limit is consistent
with all other observational bounds.Comment: uuencoded, compressed postscript; 20 pages including 7 figure
Study of guidance techniques for aerial application of agricultural compounds
Candidate systems were identified for evaluation of suitability in meeting specified accuracy requirements for a swath guidance system in an agriculture aircraft. Further examination reduced the list of potential candidates to a single category, i.e., transponder type systems, for detailed evaluation. Within this category three systems were found which met the basic accuracy requirements of the work statement. The Flying Flagman, the Electronic Flagging and the Raydist Director System. In addition to evaluating the systems against the specified requirements, each system was compared with the other two systems on a relative basis. The conclusions supported by the analyses show the Flying Flagman system to be the most suitable system currently available to meet the requirements
The Circumstellar Extinction of Planetary Nebulae
We analyze the dependence of circumstellar extinction on core mass for the
brightest planetary nebulae (PNe) in the Magellanic Clouds and M31. We show
that in all three galaxies, a statistically significant correlation exists
between the two quantities, such that high core mass objects have greater
extinction. We model this behavior, and show that the relation is a simple
consequence of the greater mass loss and faster evolution times of high mass
stars. The relation is important because it provides a natural explanation for
the invariance of the [O III] 5007 planetary nebula luminosity function (PNLF)
with population age: bright Population I PNe are extinguished below the cutoff
of the PNLF. It also explains the counter-intuitive observation that
intrinsically luminous Population I PNe often appear fainter than PNe from
older, low-mass progenitors.Comment: 12 pages, 2 figures, accepted for ApJ, April 10, 199
Climate change and public health situations in the coastal areas of Bangladesh
This study aims to investigate the population health of climate change affected people in the coastal areas of Bangladesh. The relationship between climate change and health lacks clarity in the existing literature. This study uses data collected from the area affected by cyclone Sidr in 2009. Results show that climate change triggered natural disasters such as Sidr can is affect the physical and mental health of this population. The prevalence of diarrhoea, skin diseases, dengue fever, hepatitis (jaundice) and other infectious diseases has increased after the natural disaster. The risk of injury and death also increased during the time of natural disaster. Children and older adults are the most vulnerable groups facing serious health problems including mental health. The majority of the health professionals, service providers and local community of coastal areas are more aware of the health impacts of climate change, yet their knowledge is limited regarding health protection measures
Climate change impact: the experience of the coastal areas of Bangladesh affected by cyclones Sidr and Aila
Bangladesh is considered one of the countries most at risk to the effects of climate change and its coastal area is most vulnerable. This study tries to explore the experiences of cyclones Sidr and Aila affected people living in the coastal areas of Bangladesh. This study was conducted in the cyclone Sidr affected Amtali Upazila of Barguna District and in the cyclone Aila affected Koyra Upazila of Khulna District. Primary data collection was done using Focus Group Interview and then a thematic analysis approach was used for analysis. Three core themes emerged from the analysis and they are, firstly, impacts of climate change on the socioeconomic condition of the people, secondly, the impact on the health status of the population, and finally the impact on vulnerable people. Findings show that the effects of climate change have serious consequences on the livelihood patterns of the affected population and on their overall health status. As a result, the unfavorable health condition of these affected people makes them more vulnerable to various emerging diseases
Sweet cream butter
Citation: Caldwell, R. E. and Wright, A. H. Sweet cream butter. Senior thesis, Kansas State Agricultural College, 1908.Introduction: Experiment stations of late years have been working upon the subject of flavor and keeping quality of butter. They have taken up the subject of the bacterial content of milk, ripening of cream by control of temperature, and control by commercial starters, but practically no work has been done with regard to producing sweet cream butter
A Sweetheart Of My Own : Song
https://digitalcommons.library.umaine.edu/mmb-vp/3734/thumbnail.jp
The Girl Who Keeps Me Guessing : Song
https://digitalcommons.library.umaine.edu/mmb-vp/6027/thumbnail.jp
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