519 research outputs found
How do variations in Urban Heat Islands in space and time influence household water use? The case of Phoenix, Arizona
No full textabstract: This paper explores how urbanization, through its role in the evolution of Urban Heat Island (UHI), affects residential water consumption. Using longitudinal data and drawing on a mesoscale atmospheric model, we examine how variations in surface temperature at the census tract level have affected water use in single family residences in Phoenix, Arizona. Results show that each Fahrenheit rise in nighttime temperature increases water consumption by 1.4%. This temperature effect is found to vary significantly with lot size and pool size. The study provides insights into the links between urban form and water use, through the dynamics of UHI.Corresponding Author:
Rimjhim M. Aggarwal
Arizona State University
[email protected]
Caste, religion and power: an Indian case study
No full textReviews the book "Caste, Religion and Power: An Indian Case Study," by Pratap C. Aggarwal.; Reviews the book "Caste, Religion and Power: An Indian Case Study," by Pratap C. Aggarwal
Data mining : the textbook / Charu C. Aggarwal.
No full textcomputer bookfair2016Includes bibliographical references and index.xxix, 734 pages
Searching Harder, Localizing Better, Classifying Faster: Optimizing Fast Radio Burst Detection And Analysis
No full textFast Radio Bursts (or FRBs) are millisecond-duration transients of extragalactic origin. They exhibit dispersion caused by propagation through an ionized medium, and quantified by Dispersion Measure (DM). Around 800 FRBs (24 repeaters) have been discovered; so far, 24 FRBs have been confidently associated with a host galaxy. In this thesis, we discuss multiple new FRB search and analysis techniques and the corresponding tools that enable us to search for FRBs harder, localize them better, and classify candidates faster.
We discuss five open-source software suites that can be used in FRB analysis. These suites are used to distinguish between FRBs and radio frequency interference (RFI), model FRB properties, search for periodic activity, calculate the probability of an association between an FRB and the host galaxy, and unify data processing across multiple data formats.
We then present a robust comparative analysis of clustering algorithms to group candidates from REALFAST transient search system at the Karl G. Jansky Very Large Array. We design a performance metric that optimizes for a few pure clusters, i.e., clusters with either astrophysical or noise candidates. We show that using sky location along with DM/time improves clustering performance, and propose a strategy that can be used to decide which clustering algorithm is most fit for a particular application.
We present a dense sample of bursts from the repeating FRB\,121102, discovered using our software. Using the Arecibo Telescope, we detected 133 bursts in 3~hours of data observed at 1.4\,GHz. We determine the properties of the bursts using robust spectro-temporal modeling. We find that the bursts are band-limited, with a lack of emission below 1.3\,GHz. We find the wait time distribution to be log-normal in form with a peak at 75\,s. Poissonian and Weibull distributions do not describe the burst rate distribution well. The cumulative energy distribution can be described using a broken power-law model, with the break at ~ergs and a high-energy slope of .
Motivated by the banded nature of FRB\,121102 bursts, we perform a simulation study to show that commonly used analyses of band-limited FRBs lead to observational biases. We show that all the observed shapes in the energy distributions of repeaters can be explained using these biases. We then recommend techniques to correct these biases: modeling burst spectra to robustly estimate the intrinsic properties, and using bursts that are within the observing band for energy distribution analyses.
Finally, we discuss the REALFAST search and analysis pipeline, compare it to the search pipelines on single-dish telescopes, and highlight the advantages of using an interferometer. Primarily, every detection with REALFAST comes with a precise localization that can be used to associate the FRB to a host galaxy. We then discuss five repeating FRBs that were localized using REALFAST
Decoding "Public authority" under the RTI act: a comment on Subhash Chandra Aggarwal v. Indian national congress
No full textThe June, 2013 order of the Central Information Commission ("CIC") in Subhash Chandra Aggarwal v. Indian National Congress which brought political parties within the scope of the Right to Information ("RTI") Act, has highlighted some issues regarding the drafting and interpretation of the RTI Act. The CIC held that the six national political parties which were respondents
in the case, have the ingredients that qualify them as "public authorities" within the meaning of section 2(h) of the RTI Act. In this comment the author argues that the reasoning for holding what constitutes substantial financing that makes a body a "public authority" is not clear and the interpretation of the definition of "public authority" is inconsisten
devanshkv/fetch: Software release with the manuscript
No full textA set of deep learning models for FRB/RFI binary classification
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