1,880 research outputs found
Generation of a North/South Magnetic Field Component from Variations in the Photospheric Magnetic Field
We address the problem of calculating the transverse magnetic field in the
solar wind outside of the hypothetical sphere called the source surface where
the solar wind originates. This calculation must overcome a widely used
fundamental assumption about the source surface -- the field is normally
required to purely radial at the source surface. Our model rests on the fact
that a change in the radial field strength at the source surface is a change in
the field line density. Surrounding field lines must move laterally in order to
accommodate this field line density change. As the outward wind velocity drags
field lines past the source surface this lateral component of motion produces a
tilt implying there is a transverse component to the field.
An analytic method of calculating the lateral translation speed of the field
lines is developed. We apply the technique to an interval of approximately two
Carrington rotations at the beginning of 2011 using 2-h averages of data from
the Helioseismic Magnetic Imager instrument on the Solar Dynamics Observatory
spacecraft. We find that the value of the transverse magnetic field is
dominated on a global scale by the effects of high latitude concentrations of
field lines being buffetted by supergranular motions.Comment: 23 pages with 8 figures. Accepted by Solar Physics (LaTeX processing
with aastex6.cls instead of solarphysics.cls due to compatibility issues
Markers of automaticity in sleep-associated consolidation of novel words
Two experiments investigated effects of sleep on consolidation and integration of novel form-meaning mappings using size congruity and semantic distance paradigms. Both paradigms have been used in previous studies to measure automatic access to word meanings. When participants compare semantic or physical font size of written word-pairs (e.g. BEE–COW), judgments are typically faster if relative sizes are congruent across both dimensions. Semantic distance effects are also found for wellestablished words, with semantic size judgements faster for pairs that differ substantially on this dimension. English-speaking participants learned novel form-meaning mappings with Mandarin (Experiment 1) or Malay (Experiment 2) words and were tested following overnight sleep or a similar duration awake. Judgements on English words controlled for circadian effects. The sleep group demonstrated selective stronger size congruity and semantic distance effects for novel word-pairs. This benefit occurred in Experiment 1 for semantic size comparisons of novel words, and in Experiment 2 on comparisons where novel pairs had large distances and font differences (for congruity effects) or in congruent trials (for semantic distance effects). Conversely, these effects were equivalent across sleep and wake for English words. Experiment 2 included polysomnography data and revealed that changes in the strength of semantic distance and congruity effects were positively correlated with slow-wave sleep and sleep spindles respectively. These findings support systems consolidation accounts of declarative learning and suggest that sleep plays an active role in integrating new words with existing knowledge, resulting in increased automatic access of the acquired knowledge
Effectiveness of a personalized ventilation system in reducing personal exposure against directly released simulated cough droplets
A Study on Causes of Condemnation of Carcass and Organs at Shah Alam Abattoir
A two-week study of the causes of condemnation at Shah Alam abattoir was conducted. In the bovine
species, liver and lungs w.ere the main organs condemned due to fluke infestation. and emphysema respectively.
Ninety-five percent of pig lungs were condemned because of back bleeding, while in sheep caseous lymphadenitis
was the major cause of organ condemnedtion affectingg mainly the lungs and lymph nodes. No total carcass
condemnation was observed in any species during the study perio
Photospheric Velocities Measured at Mt. Wilson Show Zonal and Sectoral Flows Compose the Torsional Oscillations
The methods for reducing the observations from the 150-foot Tower Telescope
on Mt.~Wilson are reviewed and a new method for determining the North/South
(sectoral) and the East/West (zonal) velocity components is described and
applied. Due to a calibration problem with the data prior to 1983, only
observations between 1983 and 2013 are presented at this time. After
subtraction of latitude dependent averages over the 30-year period of
observation the residual deviations in the sectoral and zonal flow velocities
are well synchronized and correspond to what is widely recognized as the
Torsional Oscillations. Both flow components need to be included in any model
that replicates the Torsional Oscillations.Comment: 15 pages, 5 figures, 1 table. Submitted to Solar Physics 7/12/202
Energy Balance of Laying Hens under Different Climates
A series of short term (3-4 weeks) energy balance experiments on laying hens were carried out under temperate and tropical climates. The results indicated that hens on ME restriction could produce egg while at the same time maintained positive energy balance. This was possible because nutrient requirements to maintain higher body weight which resulted from energy restriction, could have been reduced. Total heat production data obtained for temperate and tropical climates were 172 and 187 kcal(kgo.75 respectively
Experimental Demonstration of Quantum Fully Homomorphic Encryption with Application in a Two-Party Secure Protocol
A fully homomorphic encryption system hides data from unauthorized parties while still allowing them to perform computations on the encrypted data. Aside from the straightforward benefit of allowing users to delegate computations to a more powerful server without revealing their inputs, a fully homomorphic cryptosystem can be used as a building block in the construction of a number of cryptographic functionalities. Designing such a scheme remained an open problem until 2009, decades after the idea was first conceived, and the past few years have seen the generalization of this functionality to the world of quantum machines. Quantum schemes prior to the one implemented here were able to replicate some features in particular use cases often associated with homomorphic encryption but lacked other crucial properties, for example, relying on continual interaction to perform a computation or leaking information about the encrypted data. We present the first experimental realization of a quantum fully homomorphic encryption scheme. To demonstrate the versatility of a a quantum fully homomorphic encryption scheme, we further present a toy two-party secure computation task enabled by our scheme
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