284 research outputs found
Crossing barriers in planetesimal formation: The growth of mm-dust aggregates with large constituent grains
No full textCollisions of mm-size dust aggregates play a crucial role in the early phases of planet formation. It is for example currently unclear whether there is a bouncing barrier where millimeter aggregates no longer grow by sticking. We developed a laboratory setup that allowed us to observe collisions of dust aggregates levitating at mbar pressures and elevated temperatures of 800 K. We report on collisions between basalt dust aggregates of from 0.3 to 5 mm in size at velocities between 0.1 and 15 cm/s. Individual grains are smaller than 25 μm in size. We find that for all impact energies in the studied range sticking occurs at a probability of 32.1 ± 2.5% on average. In general, the sticking probability decreases with increasing impact parameter. The sticking probability increases with energy density (impact energy per contact area). We also observe collisions of aggregates that were formed by a previous sticking of two larger aggregates. Partners of these aggregates can be detached by a second collision with a probability of on average 19.8 ± 4.0%. The measured accretion efficiencies are remarkably high compared to other experimental results. We attribute this to the relatively large dust grains used in our experiments, which make aggregates more susceptible to restructuring and energy dissipation. Collisional hardening by compaction might not occur as the aggregates are already very compact with only 54 ± 1% porosity. The disassembly of previously grown aggregates in collisions might stall further aggregate growth. However, owing to the levitation technique and the limited data statistics, no conclusive statement about this aspect can yet be given. We find that the detachment efficiency decreases with increasing velocities and accretion dominates in the higher velocity range. For high accretion efficiencies, our experiments suggest that continued growth in the mm-range with larger constituent grains would be a viable way to produce larger aggregates, which might in turn form the seeds to proceed to growing planetesimals. © 2012 ESO
Mother Goose , or The old nursery rhymes /
No full textRBC donor: James Webb, from the library of Lucile Kelling Henderson.Illustrated t.-p. and endpapers in color."Engraved and printed by Edmund Evans, Ltd., ... London."Mode of access: Internet
Olfaction in houseflies : morphology and electrophysiology
No full texthis thesis is aimed at the improvement of housefly pest control using attractive odours in traps and baits. To achieve this aim, a further understanding is required of how houseflies detect and discriminate odours and how their olfactory sensitivity depends on physiological circumstances. Furthermore, the identity of compounds making up thefragrance of attractive substances is investigated. ...
Zie: Chapter 8
Crossing barriers in planetesimal formation: The growth of mm-dust aggregates with large constituent grains
No full textCollisions of mm-size dust aggregates play a crucial role in the early phases of planet formation. It is for example currently unclear whether there is a bouncing barrier where millimeter aggregates no longer grow by sticking. We developed a laboratory setup that allowed us to observe collisions of dust aggregates levitating at mbar pressures and elevated temperatures of 800 K. We report on collisions between basalt dust aggregates of from 0.3 to 5 mm in size at velocities between 0.1 and 15 cm/s. Individual grains are smaller than 25 μm in size. We find that for all impact energies in the studied range sticking occurs at a probability of 32.1 ± 2.5% on average. In general, the sticking probability decreases with increasing impact parameter. The sticking probability increases with energy density (impact energy per contact area). We also observe collisions of aggregates that were formed by a previous sticking of two larger aggregates. Partners of these aggregates can be detached by a second collision with a probability of on average 19.8 ± 4.0%. The measured accretion efficiencies are remarkably high compared to other experimental results. We attribute this to the relatively large dust grains used in our experiments, which make aggregates more susceptible to restructuring and energy dissipation. Collisional hardening by compaction might not occur as the aggregates are already very compact with only 54 ± 1% porosity. The disassembly of previously grown aggregates in collisions might stall further aggregate growth. However, owing to the levitation technique and the limited data statistics, no conclusive statement about this aspect can yet be given. We find that the detachment efficiency decreases with increasing velocities and accretion dominates in the higher velocity range. For high accretion efficiencies, our experiments suggest that continued growth in the mm-range with larger constituent grains would be a viable way to produce larger aggregates, which might in turn form the seeds to proceed to growing planetesimals
Improving stroke patients' care: a patient held record is not enough
No full textBackground: Stroke patients' care in hospital tends to be poorly organised, with poor communication and a lack of information being frequent sources of complaint. The purpose of this study was to evaluate whether a patient-held record (PHR) would result in greater patient satisfaction and better care planning for stroke patients.Methods: A time series control (6 months) - intervention (8 months) - control ( 6 months) was used among London teaching hospital general medical and geriatric medicine inpatient wards. All stroke patients admitted to the wards during the intervention phase received a PHR and were instructed in its use. Demographic, stroke severity, social factors and outcomes were collected from all stroke patients during all phases of the study.Results: Of 252 stroke patients aged 46 to 98 years entered into the study, by six months after admission 118 (46.8%) had died. PHR and control group patients were well matched in terms of socio-demographic characteristics and pre-stroke ability. At six months after admission, 119 (97%) patients responded to the questionnaire. Just over half (56%, 13) of intervention group patients recalled receiving a PHR. Of those patients, 59% reported reading the PHR, 27% had lost their PHR, and two-thirds said they had difficulties encouraging staff to write in the PHR. Half felt that possession of the PHR was more trouble than it was worth. PHR group patients were more satisfied with the recovery they had made (79% vs. 59%, p = 0.04), but felt less able to talk to staff about their problems (61% vs. 82%, p = 0.02). PHR group patients reported receiving fewer explanations about their condition (18% vs. 33%, p = 0.12) and treatment (26% vs. 45%, p = 0.07), and were more afraid of asking doctors questions (21% vs. 4%, p = 0.01) than controls. PHR group patients were no better prepared for hospital discharge than control group patients, and both groups were ill-informed about services and benefits that might have helped after discharge from hospital.Conclusions: Stroke patients received poor information and explanations regardless of whether they received a PHR. A PHR did not appear to improve patient satisfaction or discharge planning, and may have reduced opportunities for communication and explanation
Toelichting bij het fabrieksschema voor de ureumbereiding volgens het Pechiney proces
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
BirdVox-scaper-10k: a synthetic dataset for multilabel species classification of flight calls from 10-second audio recordings
No full text<p>BirdVox-scaper-10k: a synthetic dataset for multilabel species classification of flight calls from 10-second audio recordings<br>
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Version 1.0, September 2019.</p>
<p> </p>
<p>Created By<br>
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<p>Elizabeth Mendoza (1), Vincent Lostanlen (2, 3, 4), Justin Salamon (3, 4), Andrew Farnsworth (2), Steve Kelling (2), and Juan Pablo Bello (3, 4).</p>
<p> </p>
<p>(1): Forest Hills High School, New York, NY, USA<br>
(2): Cornell Lab of Ornithology, Cornell University, Ithaca, NY, USA<br>
(3): Center for Urban Science and Progress, New York University, New York, NY, USA<br>
(4): Music and Audio Research Lab, New York University, New York, NY, USA</p>
<p>https://wp.nyu.edu/birdvox</p>
<p> </p>
<p>Description<br>
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<p>The BirdVox-scaper-10k dataset contains 9983 artificial soundscapes. Each soundscape lasts exactly ten seconds and contains one or several avian flight calls from up to 30 different species of New World warblers (Parulidae). Alongside each audio file, we include an annotation file describing the start time and end time of each flight call in the corresponding soundscape, as well as the species of warbler it belongs to.</p>
<p>In order to synthesize soundscapes in BirdVox-scaper-10k, we mixed natural sounds from various pre-recorded sources. First, we extracted isolated recordings of flight calls containing little or no background noise from the CLO-43SD dataset [1]. Secondly, we extracted 10-second "empty" acoustic scenes from the BirdVox-DCASE-20k dataset [2]. These acoustic scenes contain various sources of real-world background noise, including biophony (insects) and anthropophony (vehicles), yet are guaranteed to be devoid of any flight calls. Lastly, we "fill" each acoustic scene by mixing it with flight calls sampled at random.</p>
<p>Although the BirdVox-scaper-10k does not consist of natural recordings, we have taken several measures to ensure the plausibility of each synthesized soundscape, both from qualitative and quantitative standpoints.<br>
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The BirdVox-scaper-10k dataset can be used, among other things, for the research, development, and testing of bioacoustic classification models.</p>
<p>For details on the hardware of ROBIN recording units, we refer the reader to [2].</p>
<p>[1] J. Salamon, J. Bello. Fusing shallow and deep learning for bioacoustic bird species classification. Proc. IEEE ICASSP, 2017.</p>
<p>[2] V. Lostanlen, J. Salamon, A. Farnsworth, S. Kelling, and J. Bello. BirdVox-full-night: a dataset and benchmark for avian flight call detection. Proc. IEEE ICASSP, 2018.</p>
<p>[3] J. Salamon, J. P. Bello, A. Farnsworth, M. Robbins, S. Keen, H. Klinck, and S. Kelling. Towards the Automatic Classification of Avian Flight Calls for Bioacoustic Monitoring. PLoS One, 2016.</p>
<p> </p>
<p> </p>
<p> </p>
<p>@inproceedings{lostanlen2018icassp,<br>
title = {BirdVox-full-night: a dataset and benchmark for avian flight call detection},<br>
author = {Lostanlen, Vincent and Salamon, Justin and Farnsworth, Andrew and Kelling, Steve and Bello, Juan Pablo},<br>
booktitle = {Proc. IEEE ICASSP},<br>
year = {2018},<br>
published = {IEEE},<br>
venue = {Calgary, Canada},<br>
month = {April},<br>
}</p>
The Tertiary Breath System: Inquiry into Achieving Autonomous Breath
No full textWhen considering the problems faced by astronauts, we find a wide gambit of opportunistic threats. Beyond standard Countermeasures, Human-countermeasures (H-CMS) – those countermeasures systems that are already engrained in our biology and can be trained or utilized through extraneous support technologies – offer unique, novel tools against these threats. One H-CMS is breath. Breath, or respiration, has a deep body of research to support numerous physiological and psychological (often creating a psychophysiological loop) response mechanisms that can have both acute and wide-ranging impacts on our human state. Further, the dualistic nature of breath (i.e., its ability to be both manually and automatically controlled) makes it the only human vital function that can be conditioned. This investigation explores the use of Galvanic Vestibular Stimulation (GVS) as a display (i.e., stimulus delivery) technology, in attending to limitations of display landscapes (e.g., audio/visual environments are heavily polluted with data demands on a user). GVS uses electrical current to stimulate vestibular nuclei and has been demonstrated to be removed from self-motion commands at high-frequency.
The study showed clear stimulus control of the subject through the GVS cue (with correct, conditioned response rates of M = 97.1%, SD = 5.08) and showed a statistically significant effect on the reduction of breathing frequency, t(26) = 8.36, p<.001; d = 1.61– as is expected both by a) the presence of the deep slow breathing (DSB) behavior being cued, as well as via b) the cascading effects of parasympathetic nervous system engagement initiated by DSB design. While the study did also there was no support for the research hypothesis – that there would be a relationship between the idealized breath topography and the conditioned-gamified (i.e., distracted, conditioned) performance – for, both, duration, t(26) = 9.95, p<.001; d = 1.91, and depth, t(26) = 3.28, p = 0.003; d = 0.631, extended comparative assessments against the subject under load (i.e., gamified pacman, unconditioned) for duration, t(26) = 21.4, p<.001; d = 4.11, and depth, t(26) = 13.4, p<.001; d = 2.58, suggest that the executed breath is much more like the idealized breath than the subject’s nominal breath. Overall, while further trails/time could improve the topography of the skill, there is a clear opportunity present in conditioning breath.
Expansion of this work would enable increased respiration complexity and the creation of autonomous breath pathways to enhance human potential, especially in austere environments (i.e., allowing artificial intelligence to optimize breath protocols based on other missions, self, and environmental conditions or deltas)
Kelling, John F. (Death, 1893-04-01)
No full textAddress: City Hospital - Sherwood Home-6th & RaceAge at death: 48-1-101/Pg. 33/1893/M W M/U.S./Dr. S.J.D. Meade/J.& T. Reed/Chicago, I11.Original record filed in drawer labeled 'Kelley-Kennealy'
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