William H. Allen
A5065824077- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Network Security and Intrusion Detection
- Astrophysical Phenomena and Observations
- Advanced Malware Detection Techniques
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Software Engineering Research
- Mobile Ad Hoc Networks
- Information and Cyber Security
- American Constitutional Law and Politics
- Opportunistic and Delay-Tolerant Networks
- Pulsars and Gravitational Waves Research
- Planetary Science and Exploration
- Business Law and Ethics
- IoT-based Smart Home Systems
- High-pressure geophysics and materials
- Advanced Software Engineering Methodologies
- Spacecraft Design and Technology
- Context-Aware Activity Recognition Systems
- Space Exploration and Technology
Rensselaer Polytechnic Institute
2022
Carter Observatory
2002-2022
Florida Institute of Technology
2012-2021
Migration Policy Institute
2021
University of California, Berkeley
2021
Institut d'Etudes Politiques de Paris
2021
Aalborg University
2021
Lancaster University
2021
Government of Victoria
2021
University of Miami
2021
We present the first measurement of planet frequency beyond "snow line," for planet-to-star mass-ratio interval −4.5 < log q −2, corresponding to range ice giants gas giants. find at mean mass ratio = 5 × 10−4 with no discernible deviation from a flat (Öpik's law) distribution in log-projected separation s. The determination is based on sample six planets detected intensive follow-up observations high-magnification (A>200) microlensing events during 2005–2008. sampled host stars have typical...
Cloud computing changed the world around us. Now people are moving their data to cloud since is getting bigger and needs be accessible from many devices. Therefore, storing on becomes a norm. However, there issues that counter stored in starting virtual machine which mean share resources ending storage itself issues. In this paper, we present those preventing adopting give survey solutions have been done minimize risks of these For example, confidential, preserving integrity available....
Abstract We report the first unambiguous detection and mass measurement of an isolated stellar-mass black hole (BH). used Hubble Space Telescope (HST) to carry out precise astrometry source star long-duration ( t E ≃ 270 days), high-magnification microlensing event MOA-2011-BLG-191/OGLE-2011-BLG-0462 (hereafter designated as MOA-11-191/OGLE-11-462), in direction Galactic bulge. HST imaging, conducted at eight epochs over interval 6 yr, reveals a clear relativistic astrometric deflection...
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with planet–star mass ratio q = [9.5 ± 2.1] × 10−5 via gravitational microlensing. The planetary deviation was detected in real-time thanks to high cadence Microlensing Observations Astrophysics survey, light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns stellar distance at Ml 0.64+0.21−0.26 M☉ Dl 5.9+0.9−1.4 kpc, respectively, so separation are Mp 20+7−8 M⊕ 3.3+1.4−0.8 AU,...
Aims. We report the discovery of a planet with high planet-to-star mass ratio in microlensing event MOA-2009-BLG-387, which exhibited pronounced deviations over 12-day interval, one longest for any planetary event. The host is an M dwarf, range 0.07 M⊙ < Mhost 0.49 at 90% confidence. planet-star q = 0.0132 ± 0.003 has been measured extremely well, so best-estimated mass, mp 2.6 Jupiter masses median 0.19 M⊙.
We present the first example of binary microlensing for which parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible a confluence two relatively unusual circumstances. First, lens bright enough (I=15.6) to permit measurements. Second, we measure not only usual 7 binary-lens parameters, but also 'microlens parallax' (which yields mass) and components instantaneous orbital velocity. Thus measure, effectively, 6 'Kepler+1' parameters...
Parallax is the most fundamental technique for measuring distances to astronomical objects. Although terrestrial parallax was pioneered over 2000 years ago by Hipparchus (ca. 140 B.C.E.) measure distance Moon, baseline of Earth so small that can generally only be applied objects in Solar System. However, there exists a class extreme gravitational microlensing events which effects readily detected and permit measurement distance, mass, transverse velocity lens. Here we report observations...
Because of the development large-format, wide-field cameras, microlensing surveys are now able to monitor millions stars with sufficient cadence detect planets. These new discoveries will span full range significance levels including planetary signals too small be distinguished from noise. At present, we do not understand where threshold is for detecting MOA-2011-BLG-293Lb first planet published surveys, and it also has substantial follow-up observations. This robustly detected in...
We present the analysis of first circumbinary planet microlensing event, OGLE-2007-BLG-349. This event has a strong planetary signal that is best fit with mass ratio $q \approx 3.4\times10^{-4}$, but there an additional due to lens mass, either another or star. find acceptable light curve fits two classes models: 2-planet models (with single host star) and models. The also reveals significant parallax effect, which constrains system be $M_L 0.7 M_\odot$. Hubble Space Telescope images resolve...
ABSTRACT We present results from a multi-chord Pluto stellar occultation observed on 2015 June 29 New Zealand and Australia. This occurred only two weeks before the NASA Horizons flyby of system serves as useful comparison between ground-based space results. find that Pluto's atmosphere is still expanding, with significant pressure increase 5 ± 2% since 2013 factor almost three 1988. trend rules out, today, an atmospheric collapse associated recession Sun. A central flash, rare occurrence,...
We present analysis of MACHO Alert 95-30, a dramatic gravitational microlensing event toward the Galactic bulge whose peak magnification departs significantly from standard point-source model. 95-30 was observed in real time by Global Microlensing Network (GMAN), which obtained densely sampled photometric and spectroscopic data throughout event. interpret light-curve "fine structure" as indicating transit lens across extended face source star. This signifies resolution star several...
A five-year follow-up of 888 asymptomatic men and women without known coronary heart disease (CHD) who had a maximal treadmill stress test (MTST) revealed CHD incidence 1.1% per year. In women, exercise duration 3 minutes or less by the Ellestad protocol correlated with subsequent development (p than 0.001), although abnormal ST-segment R-wave responses did not. 40 years age younger, MTST not correlate CHD. older years, ischemic ST response 0.01), an increase no change in R wave 5 0.001) all...
We report the results of a worldwide campaign to observe WZ Sagittae during its 2001 superoutburst. After 23 yr slumber at V = 15.5, star rose within 2 days peak brightness 8.2, and showed main eruption lasting 25 days. The return quiescence was punctuated by 12 small eruptions, ∼1 mag amplitude day recurrence time; these "echo outbursts" are uncertain origin, but somewhat resemble normal outbursts dwarf novae. 52 days, began slow decline quiescence.
ABSTRACT We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ∼ 1600 on 2008 May 30. The peak this exhibits both finite-source effects and terrestrial parallax, from we determine mass lens, M l = 0.64 ± 0.10 ☉ , its distance, D 4.0 0.6 kpc. rule out Jupiter-mass planetary companions to lens star for projected separations in range 0.5–20 AU. More generally, find that was sensitive planets with masses as small <?CDATA $0.2...
Microlensing detections of cool planets are important for the construction an unbiased sample to estimate frequency beyond snow line, which is where giant thought form according core accretion theory planet formation. In this paper, we report discovery a detected from analysis light curve high-magnification microlensing event MOA 2010-BLG-477. The measured planet–star mass ratio q = (2.181 ± 0.004) × 10−3 and projected separation s 1.1228 0.0006 in units Einstein radius. angular radius...
We report the gravitational microlensing discovery of a sub-Saturn mass planet, MOA-2009-BLG-319Lb, orbiting K or M-dwarf star in inner Galactic disk bulge. The high cadence observations MOA-II survey discovered this event and enabled its identification as magnification approximately 24 hours prior to peak magnification. As result, planetary signal at light curve was observed by 20 different telescopes, which is largest number telescopes contribute date. model for indicates planet-star ratio...
For indoor smart grids, the proper operation of building environmental systems is essential to energy efficiency, so automatic detection and classification abnormal conditions are important. The application computational intelligence tools a building's that include automation system (BAS) heating ventilating air conditioning (HVAC) loads used develop diagnostic for health monitoring, fault detection, diagnostics. A novel monitoring (HMS) variable volume (VAV) unit developed using fuzzy logic...
Abstract A simplified model using a modified effectiveness–Number of Transfer Units (NTU) method for thermal performance simulation indirect evaporative heat exchangers is presented and then validated utilizing experimental data from the literature. The objective this to facilitate efficient computer cooling or hybrid cooling/direct expansion vapor compression systems, both which include an exchanger as core component. Through some approximations, governing differential equations that...
Context. Pluto's tenuous nitrogen (N2) atmosphere undergoes strong seasonal effects due to high obliquity and orbital eccentricity, has been recently (July 2015) observed by the New Horizons spacecraft. Goals are (i) construct a well calibrated record of evolution surface pressure on Pluto (ii) constrain structure lower using central flash in 2015. Method: eleven stellar occultations between 2002 2016 used retrieve atmospheric profiles (density, pressure, temperature) $\sim$5 km $\sim$380...
Article1 October 1936ACUTE PNEUMONITISWILLIAM H. ALLEN, M.D., F.A.C.P.WILLIAM F.A.C.P.Search for more papers by this authorAuthor, Article, and Disclosure Informationhttps://doi.org/10.7326/0003-4819-10-4-441 SectionsAboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinkedInRedditEmail ExcerptIt is doubtful if there anything in medicine presenting greater difficulty classification than the so-called respiratory diseases. In every outbreak problem...
We present the analysis of gravitational microlensing event OGLE-2011-BLG-0251. This anomalous was observed by several survey and follow-up collaborations conducting observations towards Galactic Bulge. Based on detailed modelling light curve, we find that lens is composed two masses with a mass ratio q=1.9 x 10^-3. Thanks to our detection higher-order effects curve due Earth's orbital motion finite size source, are able measure distance unambiguously. made up planet 0.53 +- 0.21,M_Jup...
We present the analysis of light curves 9 high-magnification single-lens gravitational microlensing events with lenses passing over source stars, including OGLE-2004-BLG-254, MOA-2007-BLG-176, MOA-2007-BLG-233/OGLE-2007-BLG-302, MOA-2009-BLG-174, MOA-2010-BLG-436, MOA-2011-BLG-093, MOA-2011-BLG-274, OGLE-2011-BLG-0990/MOA-2011-BLG-300, and OGLE-2011-BLG-1101/MOA-2011-BLG-325. For all events, we measure linear limb-darkening coefficients surface brightness profile stars by measuring deviation...