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作者:Paolo Leonetti , Carlo Sanna
来源:[J].Journal of Number Theory(IF 0.466), 2020, Vol.207, pp.145-155
摘要:Abstract(#br)A practical number is a positive integer n such that every positive integer less than n can be written as a sum of distinct divisors of n . We prove that most of the binomial coefficients are practical numbers. Precisely, letting f ( n ) denote the number of binomi...
作者:Bichao Lu , Fanyong Zeng , Wen Xing ...
来源:[J].Clinica Chimica Acta(IF 2.85), 2020, Vol.503, pp.122-127
摘要:Abstract(#br)Background(#br)Mitochondrial DNA copy number is a potential biomarker for mitochondrial dysfunction and is involved in a variety of disease states including autism, neurodegenerative diseases and traumatic brain injury, but few studies on mitochondrial DNA copy number...
作者:Tatsuya Ohshita
来源:[J].Journal of Number Theory(IF 0.466), 2020, Vol.211, pp.95-112
摘要:Abstract(#br)Let T be a free Z p -module of finite rank equipped with a continuous Z p -linear action of the absolute Galois group of a number field K satisfying certain conditions. In this article, by using a Selmer group corresponding to T , we give a lower bound of the addi...
作者:Friedrich Götze , Anna Gusakova
来源:[J].Journal of Number Theory(IF 0.466), 2020
摘要:Abstract(#br)In this paper we study the problem of counting Salem numbers of fixed degree. Given a set of disjoint intervals I 1 , … , I k ⊂ [ 0 ; π ] , 1 ≤ k ≤ m let S a l m , k ( Q , I 1 , … , I k ) denote the set of ordered ( k + 1 ) -tuples ( α 0 , … , α k ) ...
作者:Ilkyoo Choi , Michitaka Furuya , Ringi Kim ...
来源:[J].Discrete Mathematics(IF 0.578), 2020, Vol.343 (2)
摘要:... The classical Ramsey’s theorem deals with the case when the graph parameter under consideration is the number of vertices. There is also a Ramsey-type theorem regarding connected graphs, namely, every sufficiently large connected graph contains a large induced connecte...
作者:Wang Yu-qin , Ding Ze-wen
来源:[J].Vacuum(IF 1.53), 2020, Vol.172
摘要:Abstract(#br)In order to study the influence of blade number on flow-induced noise of the centrifugal pump, a computational method based on the combination of computational fluid dynamics and computational acoustics was proposed to numerically calculate the acoustic field of...
作者:Naoki Matsumoto , Yumiko Ohno
来源:[J].Discrete Mathematics(IF 0.578), 2020, Vol.343 (2)
摘要:... The maximum number n such that G has a (proper) facial t -complete n -coloring is called the (proper) facial t -achromatic number . In this paper, we shall consider the (proper) facial 3-achromatic number of triangulations on the sphere. We first show that if the number of v...
作者:Shutao Wang , Shiyu Liu , Jingkun Zhang ...
来源:[J].Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy(IF 1.977), 2020, Vol.228
摘要:Abstract(#br)Octane number is an anti-knock index of fuel gasoline, which has an important impact on the service life of engine components and the safety of vehicles. Therefore, it is a basic work involving safety to predict the gasoline octane number accurately. This work was ai...
作者:Youyin Wang , Kunlin Cheng , Jingfeng Tang ...
来源:[J].Aerospace Science and Technology(IF 0.873), 2020, Vol.98
摘要:Abstract(#br)Scramjet is the optimal propulsion system for hypersonic vehicles, and it is important to study its maximum flight Mach number. Upper limit and its influence factors of the flight Mach number of dual-mode scramjet used in hypersonic vehicles are investigated in this ...
作者:B. Hema Sundar Raju , Dipjyoti Nath , Sukumar Pati
来源:[J].International Communications in Heat and Mass Transfer(IF 2.208), 2018, Vol.98, pp.191-199
摘要:Abstract(#br)In this paper, we numerically investigate the influence of Prandtl number on the thermo-fluidic transport characteristics for steady laminar mixed convection from a sphere in an assisting flow configuration. The stream function-vorticity formulation with a higher...

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