Results 21 to 30 of about 4,070,624 (297)

A note on almost periodic variational equations [PDF]

Communications on Pure and Applied Analysis, 2011
The variational equation of a nonautonomous differential equation (x) over dot = F(t, x) along a solution mu is given by (x) over dot = DxF(t, mu(t))x. We consider the question whether the variational equation is almost periodic provided that the original equation is almost periodic by a discussion of the following problem: Is the derivative DxF almost
Giesl, Peter, Rasmussen, Martin
openaire   +1 more source

Allocating Jobs with Periodic Demand Variations [PDF]

, 2015
In the context of service hosting in large-scale datacenters, we consider the problem faced by a provider for allocating services to machines. Based on an analysis of a public Google trace correspond-ing to the use of a production cluster over a long period, we propose a model where long-running services experience demand variations with a periodic ...
Beaumont, Olivier, Belaid, Ikbel, Eyraud-Dubois, Lionel, Lorenzo-Del-Castillo, Juan-Angel   +3 more
openaire   +1 more source

Variation in dosimeter calibration factor (Ndw) over a period of 20 years

Journal of Medical Physics, 2021
Long delays in renewal of calibration of secondary standards radiation dosimeters in radiation oncology centers due to the COVID19 pandemic have aroused concerns regarding accuracy in dose delivery to patients.
Manoj Kumar Semwal, Harishchandra Gupta, Sakshi Singhal, Ashok Kumar, Aruna Kaushik   +4 more
doaj   +1 more source

Variational Calculation of the Period of Nonlinear Oscillators [PDF]

Journal of Statistical Physics, 2004
The problem of calculating the period of second order nonlinear autonomous oscillators is formulated as an eigenvalue problem. We show that the period can be obtained from two integral variational principles dual to each other. Upper and lower bounds on the period can be obtained to any desired degree of accuracy.
Benguria Donoso, Rafael, Depassier Terán, María Cristina   +1 more
openaire   +7 more sources

Impacts of climate change and human activities on runoff change in a typical arid watershed, NW China

Ecological Indicators, 2021
The Shiyang River Basin is a typical arid watershed in Northwest China. Scientific understanding of the driving mechanism of runoff change is the basis of scientific utilization of water resources and regional sustainable development.
Dongxiang Xue, Junju Zhou, Xi Zhao, Chunfang Liu, Wei Wei, Xuemei Yang, Qiaoqiao Li, Yaru Zhao   +7 more
doaj   +1 more source

On the stability of high-speed milling with spindle speed variation [PDF]

, 2010
Spindle speed variation is a well-known technique to suppress regenerative machine tool vibrations, but it is usually considered to be effective only for low spindle speeds.
BP Mann, E Al-Regib, E Budak, E Solis, F Yang, Gilles Dessein, Grégoire Peigné, GS Duncan, H Paris, H Zhang, J Tlusty, J Tlusty, JS Sexton, JS Sexton, JS Sexton, Lionel Arnaud, M Zatarain, MA Davies, ML Campomanes, ND Sims, PV Bayly, R Radulescu, RPH Faassen, S Jayaram, S Sastry, S Seguy, S Seguy, S Smith, SA Tobias, SC Lin, SD Merdol, Sébastien Seguy, T Insperger, T Insperger, T Insperger, T Insperger, T Surmann, T Takemura, Tamás Insperger, TC Tsao, XH Long, Y Altintas, Y Altintas, Y Altintas   +43 more
core   +4 more sources

The variation of the average water flow from the Căliman Mountains [PDF]

Riscuri şi Catastrofe, 2021
The variation of river water runoff is a normal phenomenon, given the close link between runoff and atmospheric precipitation, both components of the water balance.
C. HÎRLAV
doaj   +1 more source

Radial Velocity Confirmation of a Binary Detected from Pulse Timings [PDF]

, 2011
A periodic variation in the pulse timings of the pulsating hot subdwarf B star CS 1246 was recently discovered via the O-C diagram and suggests the presence of a binary companion with an orbital period of two weeks.
Barlow, Brad N., Clemens, J. Christopher, Dunlap, Bart H.   +2 more
core   +3 more sources

A possible solution of the puzzling variation of the orbital period of MXB 1659-298 [PDF]

, 2017
MXB 1659-298 is a transient neutron star Low-Mass X-ray binary system that shows eclipses with a periodicity of 7.1 hr. The source went to outburst in August 2015 after 14 years of quiescence.
Burderi, L., D'Aì, A., Di Salvo, T., Gambino, A. F., Iaria, R., Matranga, M., Riggio, A., Sanna, A., Scarano, F.   +8 more
core   +3 more sources

The runoff variation characteristics of Dongting Lake, China

Tecnología y ciencias del agua, 2017
Mao, D., Feng, C., Zhou, H., Hu, G., Li, Z., & Guo, R. (MarchApril, 2017). The runoff variation characteristics of Dongting Lake, China. Water Technology and Sciences (in Spanish), 8(2), 77-91.
Mao Dehua, Feng Chang, Zhou Hui, Hu Guangwei, Li Zhengzui, Guo Ruizhi   +5 more
doaj   +1 more source