5,778 research outputs found
Two-directional-flow, axial-motion-joint flow liner
Flow liner eliminates high-cycle fatigue in ducts carrying cryogenic fluids. It is capable of handling two-directional, high-velocity cryogenic liquid flow with a 3-inch axial motion without binding within a 25-inch length
An assessment of the use of crown structure for the determination of the health of beech (Fagus sylvatica)
Considerable difficulties exist with the standardization and interpretation of assessments of crown defoliation, the most commonly used index of tree health in Europe. A variety of other measures of crown condition exist and one that has received considerable attention, particularly for beech (Fagus sylvatica L.), is crown architecture. Four stages of crown development are generally recognized, termed the exploration, degeneration, stagnation and resignation phases. An analysis of the available literature suggests that there are a number of problems surrounding the use of these classes to describe trees. Although the classes probably reflect the progressive deterioration of the crown of a tree, there are many factors that affect the assessment and interpretation of the scores, as is the case for defoliation estimates. Measurements of shoot elongation in the upper crown provide a more useful measure, but involve destructive sampling and are very time-consuming. Consequently, while crown architectural assessments should only be incorporated into large-scale inventories of forest health with great care, they may be useful for case studies involving the detailed examination of a small number of site
Spotted Horses
Of late much has been said about the great increase in light horse interest. More fairs have had classes for light horses than ever before, and much more material has been written about them. With this interest and publicity two breeds of spotted horses, the Morocco Spotted Horse and the Appaloosa, or Leopard Spotted horse, remain rather obscure. It is not that these horses are of recent development nor that they are not good horses. They have been going through a period of fixation of breed characters and now are coming to the forefront as animals which can uniformly transmit their desired characters
Secondary Rayleigh-Taylor type Instabilities in the Reconnection Exhaust Jet as a Mechanism for Supra-Arcade Downflows
Supra-arcade downflows (hereafter referred to as SADs) are low-emission,
elongated, finger-like features usually observed in active-region coronae above
post-eruption flare arcades. Observations exhibit downward moving SADs
intertwined with bright upward moving spikes. Whereas SADs are dark voids,
spikes are brighter, denser structures. Although SADs have been observed for
decades, the mechanism of formation of SADs remains an open issue. In our
three-dimensional resistive magnetohydrodynamic simulations, we demonstrate
that secondary Rayleigh-Taylor type instabilities develop in the downstream
region of a reconnecting current sheet. The instability results in the
formation of low-density coherent structures that resemble SADs, and
high-density structures that appear to be spike-like. Comparison between the
simulation results and observations suggests that secondary Rayleigh-Taylor
type instabilities in the exhaust of reconnecting current sheets provide a
plausible mechanism for observed SADs and spikes
Dental Involvements in the Equine
On February 27, 1945, a 4-year-old mare was presented to the Stange Memorial Clinic. A swelling on the right side of the face had been noted the previous day. The tongue was swollen and she was unable to open her mouth. The temperature was normal and the general condition good
Distribution et détection du Sirococcus clavigignenti-juglandacearum au Québec
La maladie du chancre du noyer cendré, causée par le Sirococcus clavigignenti-juglandacearum, affecte principalement le noyer cendré, Juglans cinerea, bien que le noyer noir, Juglans nigra, et les noyers hybrides puissent en être atteints. La maladie est présente dans plusieurs États américains ainsi qu'en Ontario et au Québec. Au Québec, elle a été rapportée pour la première fois en 1990, dans la région de Fort-Coulonge, en Outaouais. Depuis, de nouveaux foyers d'infection ont été notés en forêt naturelle ainsi que dans une plantation. En 1995, elle a été observée pour la première fois sur des semis de noyer dans deux pépinières forestières québécoises. Cette détection constitue le premier cas documenté de la maladie sur des semis de noyer cendré et de noyer noir dans des pépinières forestières.Although the Sirococcus canker of butternut, caused by Sirococcus clavigignenti-juglandacearum, has caused damage only to butternut, Juglans cinerea, black walnut, Juglans nigra, and hybrids of walnut are also susceptible to a certain degree. The disease is present in the United States, in Ontario and in Quebec. In Quebec, the disease was first reported in 1990 near Fort-Coulonge, in the Outaouais region. Since then, new infection sites have been observed in natural stands and in one plantation. In 1995, this disease was isolated for the first time from seedlings in two forest nurseries in Quebec. This constitutes the first report of the disease on butternut and black walnut seedlings in forest nurseries
Participant recruitment to FiCTION, a primary dental care trial – survey of facilitators and barriers
Objective To identify reasons behind a lower than expected participant recruitment rate within the FiCTION trial, a multi-centre paediatric primary dental care randomised controlled trial (RCT).
Subjects (materials) and methods An online survey, based on a previously published tool, consisting of both quantitative and qualitative responses, completed by staff in dental practices recruiting to FiCTION. Ratings from quantitative responses were aggregated to give overall scores for factors related to participant recruitment. Qualitative responses were independently grouped into themes.
Results Thirty-nine anonymous responses were received. Main facilitators related to the support received from the central research team and importance of the research question. The main barriers related to low child eligibility rates and the integration of trial processes within routine workloads.
Conclusions These findings have directed strategies for enhancing participant recruitment at existing practices and informed recruitment of further practices. The results help provide a profile of the features required of practices to successfully screen and recruit participants. Future trials in this setting should consider the level of interest in the research question within practices, and ensure trial processes are as streamlined as possible. Research teams should actively support practices with participant recruitment and maintain enthusiasm among the entire practice team
Destabilization of a Solar Prominence/Filament Field System by a Series of Eight Homologous Eruptive Flares
Homologous flares are flares that occur repetitively in the same active
region, with similar structure and morphology. A series of at least eight
homologous flares occurred in active region NOAA 11237 over 16 - 17 June 2011.
A nearby prominence/filament was rooted in the active region, and situated near
the bottom of a coronal cavity. The active region was on the southeast solar
limb as seen from SDO/AIA, and on the disk as viewed from STEREO/EUVI-B. The
dual perspective allows us to study in detail behavior of the
prominence/filament material entrained in the magnetic field of the
repeatedly-erupting system. Each of the eruptions was mainly confined, but
expelled hot material into the prominence/filament cavity system (PFCS). The
field carrying and containing the ejected hot material interacted with the PFCS
and caused it to inflate, resulting in a step-wise rise of the PFCS
approximately in step with the homologous eruptions. The eighth eruption
triggered the PFCS to move outward slowly, accompanied by a weak coronal
dimming. As this slow PFCS eruption was underway, a final ejective flare
occurred in the core of the active region, resulting in strong dimming in the
EUVI-B images and expulsion of a coronal mass ejection (CME). A plausible
scenario is that the repeated homologous flares could have gradually
destabilized the PFCS, and its subsequent eruption removed field above the
acitive region and in turn led to the ejective flare, strong dimming, and CME.Comment: 11 pages, 12 figures, Accepted for publication in Ap
EIS/Hinode observations of Doppler flow seen through the 40 arcsec wide slit
The Extreme ultraviolet Imaging Spectrometer (EIS) on board Hinode is the
first solar telescope to obtain wide slit spectral images that can be used for
detecting Doppler flows in transition region and coronal lines on the Sun and
to relate them to their surrounding small scale dynamics. We select EIS lines
covering the temperature range 6x10^4 K to 2x10^6 K that give spectrally pure
images of the Sun with the 40 arcsec slit. In these images Doppler shifts are
seen as horizontal brightenings. Inside the image it is difficult to
distinguish shifts from horizontal structures but emission beyond the image
edge can be unambiguously identified as a line shift in several lines separated
from others on their blue or red side by more than the width of the
spectrometer slit (40 pixels). In the blue wing of He II, we find a large
number of events with properties (size and lifetime) similar to the
well-studied explosive events seen in the ultraviolet spectral range.
Comparison with X-Ray Telescope (XRT) images shows many Doppler shift events at
the footpoints of small X-ray loops. The most spectacular event observed showed
a strong blue shift in transition region and lower corona lines from a small
X-ray spot that lasted less than 7 min. The emission appears to be near a cool
coronal loop connecting an X-ray bright point to an adjacent region of quiet
Sun. The width of the emission implies a line-of-sight velocity of 220 km/s. In
addition, we show an example of an Fe XV shift with a velocity about 120 km/s,
coming from what looks like a narrow loop leg connecting a small X-ray
brightening to a larger region of X-ray emission.Comment: 12 pages, 8 figures, to be published in Solar Physic
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