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American Journal of Applied Mathematics

Archive

2024, Volume 12
1. Issue 2, Apr.
2. Issue 1, Feb.
2023, Volume 11
2022, Volume 10
2021, Volume 9
2020, Volume 8
2019, Volume 7
2018, Volume 6
2017, Volume 5
2016, Volume 4
2015, Volume 3
2014, Volume 2
2013, Volume 1

Volume 9, Issue 6, December 2021

Using Full Cohort Information to Improve the Estimation Efficiency of Marginal Hazard Model for Multivariate Failure Times in Case-Cohort Studies

Hongtao Zhang, Haibo Zhou, David Couper, Jianwen Cai

Issue: Volume 9, Issue 6, December 2021

Pages: 192-210

Received: 8 June 2021

Accepted: 2 December 2021

Published: 24 December 2021

DOI: 10.11648/j.ajam.20210906.11

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Abstract: The case-cohort design is widely used in large cohort studies when it is prohibitively costly to measure some exposures for all subjects in the full cohort, especially in studies where the disease rate is low. To investigate the effect of a risk factor on different diseases, multiple case-cohort studies using the same subcohort are usually conducte... Show More

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Natural Gas Pipeline Transportation as the Thermodynamic Process

Vladimir Alekber Suleymanov

Issue: Volume 9, Issue 6, December 2021

Pages: 211-215

Received: 22 November 2021

Accepted: 28 December 2021

Published: 30 October 2021

DOI: 10.11648/j.ajam.20210906.12

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Abstract: A verification of commonly used approval in pipeline hydraulics is carried out that the work of friction forces performed at the movement of real gas on the gas pipeline completely turns into thermal energy. It is obvious that measurements of the actual temperature of the transported gas cannot confirm this hypothesis due to the inaccuracy of measu... Show More

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