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Articles 1 - 9 of 9
Full-Text Articles in Science and Technology Studies
The Evolution In The Stellar Mass Of Brightest Cluster Galaxies Over The Past 10 Billion Years, Sabine Bellstedt, Christopher E. Lidman, Adam Muzzin, Marijn Franx, Susanna Guatelli, Allison R. Hill, Henk Hoekstra, Noah Kurinsky, Ivo Labbe, Danilo Marchesini, Z. Cemile Marsan, Mitra Safavi-Naeini, Cristobal Sifon, Mauro Stefanon, Jesse Van De Sande, Pieter Van Dokkum, Catherine Weigel
The Evolution In The Stellar Mass Of Brightest Cluster Galaxies Over The Past 10 Billion Years, Sabine Bellstedt, Christopher E. Lidman, Adam Muzzin, Marijn Franx, Susanna Guatelli, Allison R. Hill, Henk Hoekstra, Noah Kurinsky, Ivo Labbe, Danilo Marchesini, Z. Cemile Marsan, Mitra Safavi-Naeini, Cristobal Sifon, Mauro Stefanon, Jesse Van De Sande, Pieter Van Dokkum, Catherine Weigel
Faculty of Engineering and Information Sciences - Papers: Part A
Using a sample of 98 galaxy clusters recently imaged in the near-infrared with the European Southern Observatory (ESO) New Technology Telescope, WIYN telescope and William Her- schel Telescope, supplemented with 33 clusters from the ESO archive, we measure how the stellar mass of the most massive galaxies in the universe, namely brightest cluster galaxies (BCGs), increases with time. Most of the BCGs in this new sample lie in the redshift range 0.2
Dipole Antenna Array Cluster For Cubesats, Sining Liu, Raad Raad, Kwan-Wu Chin, Faisel Em M Tubbal
Dipole Antenna Array Cluster For Cubesats, Sining Liu, Raad Raad, Kwan-Wu Chin, Faisel Em M Tubbal
Faculty of Engineering and Information Sciences - Papers: Part A
CubeSats are attracting interest from both the industry and academia because of their affordability. Specifically, they are made from commercial Off-The-Shelf (COTS) electronic circuit chips, and are thus seen as a cost effective replacement for traditional, expensive satellites. Moreover, they are expected to have higher capabilities to better support demanding missions. To date, most CubeSats rely on a single element antenna that usually has a relatively low gain and are not steerable. Thus, they are not suitable for long-distance communications and for use by missions requiring high-speed links and adjustable radiation patterns. Existing single element antennas also increase the probability …
A Sensor Fault Detection Strategy For Air Handling Units Using Cluster Analysis, Rui Yan, Zhenjun Ma, Georgios Kokogiannakis, Yang Zhao
A Sensor Fault Detection Strategy For Air Handling Units Using Cluster Analysis, Rui Yan, Zhenjun Ma, Georgios Kokogiannakis, Yang Zhao
Faculty of Engineering and Information Sciences - Papers: Part A
Sensors are an essential component in the control systems of air handling units (AHUs). A biased sensor reading could result in inappropriate control and thereby increased energy consumption or unsatisfied indoor thermal comfort. This paper presents an unsupervised learning based strategy using cluster analysis for AHU sensor fault detection. The historical data recorded from sensors is first pre-processed to reduce the dimensions using principal component analysis (PCA). The clustering algorithmOrdering Points to Identify the Clustering Structure (OPTICS) is then employed to identify the spatial separated data groups (i.e. clusters),which possibly indicate the occurrence of sensor faults. The data points in …
Butyrate-Producing Clostridium Cluster Xiva Species Specifically Colonize Mucins In An In Vitro Gut Model, Pieter Van Den Abbeele, Clara Belzer, Margot Goossens, Michiel Kleerebezem, William M. De Vos, Olivier Thas, Rosemarie De Weirdt, Frederiek-Maarten Kerckhof, Tom Van De Wiele
Butyrate-Producing Clostridium Cluster Xiva Species Specifically Colonize Mucins In An In Vitro Gut Model, Pieter Van Den Abbeele, Clara Belzer, Margot Goossens, Michiel Kleerebezem, William M. De Vos, Olivier Thas, Rosemarie De Weirdt, Frederiek-Maarten Kerckhof, Tom Van De Wiele
Faculty of Engineering and Information Sciences - Papers: Part A
The human gut is colonized by a complex microbiota with multiple benefits. Although the surface-attached, mucosal microbiota has a unique composition and potential to influence human health, it remains difficult to study in vivo. Therefore, we performed an in-depth microbial characterization (human intestinal tract chip (HITChip)) of a recently developed dynamic in vitro gut model, which simulates both luminal and mucosal gut microbes (mucosal-simulator of human intestinal microbial ecosystem (M-SHIME)). Inter-individual differences among human subjects were confirmed and microbial patterns unique for each individual were preserved in vitro. Furthermore, in correspondence with in vivo studies, Bacteroidetes and Proteobacteria were enriched …
Fitting Position Latent Cluster Models For Social Networks With Latentnet, Pavel N. Krivitsky, M Handcock
Fitting Position Latent Cluster Models For Social Networks With Latentnet, Pavel N. Krivitsky, M Handcock
Faculty of Engineering and Information Sciences - Papers: Part A
latentnet is a package to fit and evaluate statistical latent position and cluster models for networks. Hoff, Raftery, and Handcock (2002) suggested an approach to modeling networks based on positing the existence of an latent space of characteristics of the actors. Relationships form as a function of distances between these characteristics as well as functions of observed dyadic level covariates. In latentnet social distances are represented in a Euclidean space. It also includes a variant of the extension of the latent position model to allow for clustering of the positions developed in Handcock, Raftery, and Tantrum (2007). The package implements …
Chandra Observations Of Nuclear Outflows In The Elliptical Galaxy Ngc 4552 In The Virgo Cluster, M Machacek, Paul E. J Nulsen, C Jones, W R. Forman
Chandra Observations Of Nuclear Outflows In The Elliptical Galaxy Ngc 4552 In The Virgo Cluster, M Machacek, Paul E. J Nulsen, C Jones, W R. Forman
Faculty of Engineering and Information Sciences - Papers: Part A
We use a 54.4 ks Chandra observation to study nuclear outflow activity in NGC 4552 (M89), an elliptical galaxy in the Virgo Cluster. Chandra images in the 0.5–2 keV band show two ringlike features ∼1.7 kpc in diameter in the core of NGC 4552, as reported previously by Filho et al. We use spherically symmetric point explosion shock models to argue that the shape of the surface brightness profile across the rims of the rings and the temperature of hot gas in the rings are consistent with a Mach 1.7 shock carrying mean mechanical power Lshock ∼ 3 × 1041 …
Asca And Rosat Observations Of Nearby Cluster Cooling Flows, S W. Allen, A C. Fabian, R M. Johnstone, K A. Arnaud, Paul E J Nulsen
Asca And Rosat Observations Of Nearby Cluster Cooling Flows, S W. Allen, A C. Fabian, R M. Johnstone, K A. Arnaud, Paul E J Nulsen
Faculty of Engineering and Information Sciences - Papers: Part A
We present a detailed analysis of the X-ray properties of the cooling flows in a sample of nearby, X-ray-bright clusters of galaxies using high-quality ASCA spectra and ROSAT X-ray images. We demonstrate the need for multiphase models to consistently explain the spectral and imaging X-ray data for the clusters. The mass deposition rates of the cooling flows, independently determined from the ASCA spectra and ROSAT images, exhibit reasonable agreement. We confirm the presence of intrinsic X-ray absorption in the clusters using a variety of spectral models. We also report detections of 100-μm infrared emission, spatially coincident with the cooling flows, …
Chandra X-Ray Observations Of The 3c 295 Cluster Core, S W. Allen, G B. Taylor, Paul E J Nulsen, R M. Johnstone, L P. David, S Ettori, A C. Fabian, W R. Forman, C Jones, B Mcnamara
Chandra X-Ray Observations Of The 3c 295 Cluster Core, S W. Allen, G B. Taylor, Paul E J Nulsen, R M. Johnstone, L P. David, S Ettori, A C. Fabian, W R. Forman, C Jones, B Mcnamara
Faculty of Engineering and Information Sciences - Papers: Part A
We examine the properties of the X-ray gas in the central regions of the distant (z=0.46), X-ray luminous cluster of galaxies surrounding the powerful radio source 3C 295, using observations made with the Chandra Observatory. Between radii of 50 and 500 kpc, the cluster gas is approximately isothermal with an emission-weighted temperature, kT∼5 keV. Within the central 50-kpc radius this value drops to kT∼3.7 keV. The spectral and imaging Chandra data indicate the presence of a cooling flow within the central 50-kpc radius of the cluster, with a mass deposition rate of approximately 280 M⊙ …
Molecular Epidemiology Of Escherichia Coli 0157:H7 Strains By Bacteriophage A Restriction Fragment Length Polymorphism Analysis: Application To A Multistate Foodborne Outbreak And A Day-Care Center Cluster, Mansour Samadpour, Linda M. Grimm, B Desai, Dalia Alfi, Jerry E. Ongerth, Phillip I. Tarr
Molecular Epidemiology Of Escherichia Coli 0157:H7 Strains By Bacteriophage A Restriction Fragment Length Polymorphism Analysis: Application To A Multistate Foodborne Outbreak And A Day-Care Center Cluster, Mansour Samadpour, Linda M. Grimm, B Desai, Dalia Alfi, Jerry E. Ongerth, Phillip I. Tarr
Faculty of Engineering and Information Sciences - Papers: Part A
Genomic DNAs prepared from 168 isolates of Escherichia coli 0157:H7 were analyzed for restriction fragment length polymorphisms on Southern blots probed with bacteriophage A DNA. The isolates analyzed included strains from a recent large multistate outbreak of E. coli 0157:H7 infection associated with consumption of poorly cooked beef in restaurants, a day-care center cluster, and temporally and geographically unrelated isolates. E. coli 0157:H7 isolates recovered from the incriminated meat and from 61 (96.8%) of 63 patients from Washington and Nevada possessed identical A restriction fragment length patterns. The A restriction fragment length polymorphisms observed in 11 (91.7%) of 12 day-care …