Forward Decay: A Practical Time Decay Model for Streaming Systems

2009 ◽  
Author(s):  
Graham Cormode ◽  
Vladislav Shkapenyuk ◽  
Divesh Srivastava ◽  
Bojian Xu
Keyword(s):  
Time Decay ◽  
Decay Model ◽  
Streaming Systems

scholarly journals Compaction and subsidence of the Groningen gas field in the Netherlands

2015 ◽  
Vol 372 ◽  
pp. 367-373 ◽  
Author(s):  
K. van Thienen-Visser ◽  
J. P. Pruiksma ◽  
J. N. Breunese
Keyword(s):  
The Netherlands ◽  
Time Decay ◽  
Good Match ◽  
Gas Field ◽  
Decay Model ◽  
Groningen Gas Field ◽  
Rate Type

Abstract. The Groningen gas field in the Netherlands is Europe's largest gas field. It has been produced since 1963 and production is expected to continue until 2080. The pressure decline in the field causes compaction in the reservoir which is observed as subsidence at the surface. Measured subsidence is characterized by a delay at the start of production. As linear compaction models cannot explain this behavior, alternative compaction models (e.g. Rate Type Compaction Model and Time Decay model) have been investigated that may explain the measured subsidence. Although the compaction models considered in this study give a good match to this delay, their forecasts are significantly different. Future measurements of subsidence in this area will indicate which type of compaction model is preferred. This will lead to better forecasts of subsidence in future. The pattern of over- and underestimation of the subsidence is similar for the compaction models investigated and tested. The pattern can be explained by differences in modeled porosity and aquifer activity illustrating the improvement of subsurface knowledge on the reservoir using subsidence measurements.

scholarly journals Time Decay for Nonlinear Dissipative Schrödinger Equations in Optical Fields

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Nakao Hayashi ◽  
Chunhua Li ◽  
Pavel I. Naumkin
Keyword(s):  
Lower Bound ◽  
Positive Root ◽  
Schrodinger Equations ◽  
Schrödinger Equations ◽  
Time Decay ◽  
Large Initial Data ◽  
Initial Value ◽  
Optical Fields ◽  
Gauge Invariant ◽  
Dissipative Condition

We consider the initial value problem for the nonlinear dissipative Schrödinger equations with a gauge invariant nonlinearityλup-1uof orderpn<p≤1+2/nfor arbitrarily large initial data, where the lower boundpnis a positive root ofn+2p2-6p-n=0forn≥2andp1=1+2forn=1.Our purpose is to extend the previous results for higher space dimensions concerningL2-time decay and to improve the lower bound ofpunder the same dissipative condition onλ∈C:Im⁡ λ<0andIm⁡ λ>p-1/2pRe λas in the previous works.

scholarly journals Analysis and control of a fractional chaotic tumour growth and decay model

2021 ◽  
Vol 20 ◽  
pp. 103677
Author(s):  
Emad E. Mahmoud ◽  
Lone Seth Jahanzaib ◽  
Pushali Trikha ◽  
Kholod M. Abualnaja
Keyword(s):  
Tumour Growth ◽  
Decay Model ◽  
And Control
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