scispace - formally typeset
Search or ask a question
Author

Parminder Singh

Bio: Parminder Singh is an academic researcher from Guru Nanak Dev University. The author has contributed to research in topics: Population & Scale parameter. The author has an hindex of 12, co-authored 65 publications receiving 408 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, indoor radon, thoron and their decay products concentrations have been measured using the newly developed LR-115 type- ǫ based Radon-Thoron discriminating twin-cup dosimeters with single entry face, direct radon and thoron progeny sensors (DRPS/DTPS) respectively.

61 citations

Journal ArticleDOI
TL;DR: Average value of uranium content in water samples of SW Punjab is observed to be higher than WHO, USEPA recommended safe limit of 30µgl-1 as well as AERB proposed limit of 60µ gl-1, whereas, for W and NE region of Punjab, average level of uranium concentration was within AERb recommended limit of60µGL-1.

47 citations

Journal ArticleDOI
TL;DR: In this article, the gamma ray spectroscopy in surface soil samples collected from the historical city Panipat and its surrounding areas has been used to determine the natural radioactivity levels.

42 citations

Journal ArticleDOI
TL;DR: The values of 222Rn/220Rn concentrations and annual effective doses obtained in the present study are within the safe limits as recommended by the International Commission on Radiological Protection for indoor dwelling exposure conditions.
Abstract: In this study, measurements of indoor radon ((222)Rn), thoron ((220)Rn) and their equilibrium equivalent concentration (EEC) were carried out in 96 dwellings from 22 different villages situated in Hamirpur district, Himachal Pradesh, India, by using LR-115 type II-based pinhole twin cup dosimeters and deposition-based progeny sensors (DRPS/DTPS). The annual average indoor (222)Rn and (220)Rn concentrations observed in these dwellings were 63.82 and 89.59 Bq/m(3), respectively, while the average EEC (attached + unattached) for (222)Rn and (220)Rn was 29.28 and 2.74 Bq/m(3). For (222)Rn (f Rn) and (220)Rn (f Tn), the average values of unattached fraction were 0.11 and 0.09, respectively. The equilibrium factors for radon (F Rn) and thoron (F Tn) varied from 0.12 to 0.77 with an average of 0.50, and from 0.01 to 0.34 with an average of 0.05, respectively. The annual inhalation dose due to mouth and nasal breathing was calculated using dose conversion factors and unattached fractions. The indoor annual effective doses for (222)Rn (AEDR) and (220)Rn (AEDT) were found to be 1.92 and 0.83 mSv a(-1), respectively. The values of (222)Rn/(220)Rn concentrations and annual effective doses obtained in the present study are within the safe limits as recommended by the International Commission on Radiological Protection for indoor dwelling exposure conditions.

25 citations

Journal ArticleDOI
TL;DR: In this paper, the formation of benzoindolizines is postulated to involve regioselective addition of 1,3-dipole to C2-C3 π bond of allenic esters/ketones followed by domino transformation of the cycloadducts, which involve an intramolecular aza Diels-Alder reaction in the intermediate C.

25 citations


Cited by
More filters
Journal ArticleDOI
01 May 1975
TL;DR: The Fundamentals of Queueing Theory, Fourth Edition as discussed by the authors provides a comprehensive overview of simple and more advanced queuing models, with a self-contained presentation of key concepts and formulae.
Abstract: Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

2,562 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comparison of multiple comparative methods in theory and methods for quality assurance in the field of quality assurance. Journal of Quality Technology: Vol. 29, No. 3, No 3, pp. 359-359.
Abstract: (1997). Multiple Comparisons: Theory and Methods. Journal of Quality Technology: Vol. 29, No. 3, pp. 359-359.

402 citations

Journal ArticleDOI
19 Apr 1985-JAMA
TL;DR: The fifth edition of this classic publication is better and more useful than ever, but now the published case reports with the inclusion of clinical experimental research articles expand its role as a reference book and make it doubly effective and valuable.
Abstract: The fifth edition of this classic publication is better and more useful than ever. Its format remains the same, but now the published case reports with the inclusion of clinical experimental research articles expand its role as a reference book and make it doubly effective and valuable. All sections have been enlarged and updated. For example, Section II, "Ingredients Index," has been increased from 273 pages to 460 pages, offering a comprehensive listing and toxicity review of individual product ingredients. This and the "General Formulations" section, which lists in alphabetical order the numerous products and agents commonly found in households and on farms, give ready information and potential ingredient toxicity of the more common products that are involved in accidental and willful poisoning in the United States. Such information is urgently needed in emergencies, when specific product details are required for proper treatment. The latter can be found in Section

181 citations

01 May 1995

107 citations