Potential Intensification Rate of Tropical Cyclones in a Simplified Energetically Based Dynamical System Model: An Observational Analysis

2022 ◽  
Keyword(s):  
Dynamical System ◽  
Numerical Simulations ◽  
Relative Intensity ◽  
Intensity Change ◽  
Future Directions ◽  
Intensity Dependence ◽  
The North ◽  
System A ◽  
Detailed Evaluation ◽  
Basic Features

Abstract In a recent study by Wang et al. (2021a) that introduced a dynamical efficiency to the intensification potential of a tropical cyclone (TC) system, a simplified energetically based dynamical system (EBDS) model was shown to be able to capture the intensity-dependence of TC potential intensification rate (PIR) in both idealized numerical simulations and observations. Although the EBDS model can capture the intensity-dependence of TC intensification as in observations, a detailed evaluation has not yet been done. This study provides an evaluation of the EBDS model in reproducing the intensity-dependent feature of the observed TC PIR based on the best-track data for TCs over the North Atlantic, central, eastern and western North Pacific during 1982–2019. Results show that the theoretical PIR estimated by the EBDS model can capture basic features of the observed PIR reasonably well. The TC PIR in the best-track data increases with increasing relative TC intensity (intensity normalized by its corresponding maximum potential intensity–MPI) and reaches a maximum at an intermediate relative intensity around 0.6, and then decreases with increasing relative intensity to zero as the TC approaches its MPI, as in idealized numerical simulations. Results also show that the PIR for a given relative intensity increases with the increasing MPI and thus increasing sea surface temperature, which is also consistent with the theoretical PIR implied by the EBDS model. In addition, future directions to include environmental effects and make the EBDS model applicable to predict intensity change of real TCs are also discussed.

scholarly journals Adaptive Control and Synchronization of Sprott J System With Estimation Of Fully Unknown Parameters

2015 ◽  
Vol 45 (2) ◽  
pp. 45-58 ◽  
Author(s):  
Mitul Islam ◽  
Nurul Islam ◽  
Svetoslav Nikolov
Keyword(s):  
Dynamical System ◽  
Adaptive Control ◽  
Lyapunov Function ◽  
Numerical Simulations ◽  
Unknown Parameters ◽  
Adaptive Scheme ◽  
System A ◽  
Control And Synchronization ◽  
Synchronization Scheme ◽  
Derivatives Of

Abstract This communication develops an adaptive scheme for control and synchronization of Sprott J system with fully unknown parameters. The scheme provides an elegant strategy of designing estimators for identification of the unknown parameters of the underlying dynamical system. Adaptive control and update laws are proposed to globally stabilize the chaotic Sprott J system. A pair of identical Sprott J systems with un- known parameters are globally synchronized with the help of adaptive control and parameter update laws. The results are established using LaSalle invariance principle, which lays down weaker restrictions on the derivatives of the Lyapunov function, and producing more general results. All the results obtained in the paper are global in nature. Numerical simulations are performed to illustrate the validity and effectiveness of the proposed adaptive control and synchronization scheme in the context of the Sprott J system. The parameter identification capability of the scheme is also explored.

Chinese Historiography in the Age of Maturity, 960–1368

2018 ◽  
Author(s):  
Charles Hartman
Keyword(s):  
South China ◽  
Song Dynasty ◽  
Political Power ◽  
Examination System ◽  
Economic Expansion ◽  
New Class ◽  
The Song Dynasty ◽  
The North ◽  
System A ◽  
Age Of Maturity

This chapter looks at how the Song dynasty (960–1279) reconsolidated central power and eliminated the provincial regimes that had developed in the wake of Tang decentralization. During the first thirty years after 960, they fostered astute policies that promoted and took advantage of continuing economic expansion. To administer their new polity, the Song emperors recruited through the examination system a new class of bureaucratic elite that Western writings on China often call the ‘literati’. The aristocrats of Tang had given way to the merchants and bureaucrats of Song. However, although the Song expanded Chinese economic and political power into South China, it never completed the conquest of all the traditional Chinese lands in the north. The Song coexisted with a series of alien or conquest dynasties to its north and west.

Suppressing Chaos in a Nonideal Double-Well Oscillator Using an Based Electromechanical Damped Device

2014 ◽  
Vol 706 ◽  
pp. 25-34 ◽  
Author(s):  
G. Füsun Alişverişçi ◽  
Hüseyin Bayiroğlu ◽  
José Manoel Balthazar ◽  
Jorge Luiz Palacios Felix
Keyword(s):  
Numerical Simulations ◽  
Chaotic Dynamics ◽  
Duffing Oscillator ◽  
Vibration Energy ◽  
Vibration Absorber ◽  
Electrical System ◽  
Chaotic Vibration ◽  
System A ◽  
Ideal System ◽  
Double Well Potential

In this paper, we analyzed chaotic dynamics of an electromechanical damped Duffing oscillator coupled to a rotor. The electromechanical damped device or electromechanical vibration absorber consists of an electrical system coupled magnetically to a mechanical structure (represented by the Duffing oscillator), and that works by transferring the vibration energy of the mechanical system to the electrical system. A Duffing oscillator with double-well potential is considered. Numerical simulations results are presented to demonstrate the effectiveness of the electromechanical vibration absorber. Lyapunov exponents are numerically calculated to prove the occurrence of a chaotic vibration in the non-ideal system and the suppressing of chaotic vibration in the system using the electromechanical damped device.

scholarly journals Inverse-square law between time and amplitude for crossing tipping thresholds

2019 ◽  
Vol 475 (2222) ◽  
pp. 20180504 ◽  
Author(s):  
Paul Ritchie ◽  
Özkan Karabacak ◽  
Jan Sieber
Keyword(s):  
Dynamical System ◽  
Feedback Loop ◽  
Tipping Point ◽  
Dimensional System ◽  
Stochastic Forcing ◽  
Inverse Square Law ◽  
System A ◽  
Asymptotic Expressions ◽  
Higher Dimensional ◽  
Random Disturbances

A classical scenario for tipping is that a dynamical system experiences a slow parameter drift across a fold tipping point, caused by a run-away positive feedback loop. We study what happens if one turns around after one has crossed the threshold. We derive a simple criterion that relates how far the parameter exceeds the tipping threshold maximally and how long the parameter stays above the threshold to avoid tipping in an inverse-square law to observable properties of the dynamical system near the fold. For the case when the dynamical system is subject to stochastic forcing we give an approximation to the probability of tipping if a parameter changing in time reverses near the tipping point. The derived approximations are valid if the parameter change in time is sufficiently slow. We demonstrate for a higher-dimensional system, a model for the Indian summer monsoon, how numerically observed escape from the equilibrium converge to our asymptotic expressions. The inverse-square law between peak of the parameter forcing and the time the parameter spends above a given threshold is also visible in the level curves of equal probability when the system is subject to random disturbances.

scholarly journals Early Social Environment Affects the Endogenous Oxytocin System: A Review and Future Directions

2015 ◽  
Vol 6 ◽  
Author(s):  
Emily Alves ◽  
Andrea Fielder ◽  
Nerelle Ghabriel ◽  
Michael Sawyer ◽  
Femke T. A. Buisman-Pijlman
Keyword(s):  
Social Environment ◽  
Future Directions ◽  
System A

scholarly journals The North-South Gas Corridor in the Context of Poland’s Gas Transmission System—A Perfect Opportunity to Diversify Gas Resources

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7188
Author(s):  
Wiktor Hebda
Keyword(s):  
Energy Security ◽  
Field Research ◽  
Green Energy ◽  
Coal Production ◽  
The North ◽  
System A ◽  
State Of Affairs ◽  
High Level ◽  
Huge Challenge ◽  
Gas Supply

The energy sector in Poland is currently calling for dynamic redevelopment and cleaner energy. This country is world famous for its high level of coal production, from which it does not want to retreat in the next two decades. For this reason, it is safer to gradually reduce the use of coal while increasing the consumption of gas and simultaneously developing green energy. However, the Polish gas sector is still dependent on Russian gas supplied through the Yamal gas pipeline. Taking into consideration Polish geopolitics, this state of affairs poses a huge challenge and a threat to Poland’s energy security. That is why the concept of the North-South Gas Corridor was introduced. It is intended to be a network of gas pipelines that connect the countries of Central and South Europe to two gas terminals (in Poland and Croatia), which will supply gas from a chosen source. This article presents the current condition of the gas sector in Poland. It focuses on the North-South Gas Corridor project and its impact on the energy security of Poland. An analysis of documents and field research shows that the North-South Gas Corridor provides Poland with an opportunity to diversify the sources and directions of gas supply over the next few years.

B2B, B2C and Virtual Enterprise Management Systems

2020 ◽  
pp. 118-127
Author(s):  
Yong Geng Chen
Keyword(s):  
Virtual Enterprise ◽  
Enterprise Management ◽  
Virtual Enterprises ◽  
Future Directions ◽  
Web Based ◽  
Goods And Services ◽  
Detailed Evaluation ◽  
Business To Consumer ◽  
Definition Of ◽  
Business To Business

This research paper provides a detailed evaluation of the business concepts in Electronic Commerce (E-Commerce). The concept of E-Commerce defines the exchange of goods and services with monetary value between consumers and companies. E-Commerce is a web-based catalogue whereby buyers can possibly place order and sellers possibly accept payments. E-Commerce incorporates two forms of business: Business-to-Business (B2B) and Business-to-Consumer (B2C), which provides a definition of the commerce transactions between enterprises, such as between the wholesalers and the manufacturers or the retailers. B2C E-Commerce provides enterprises with the model which allows businesses to deliver purchasers to the relevant merchants and achieve from the commission rewards given by the merchants. This paper evaluates two forms of business with relation to management of Virtual Enterprises (VE) in the field of E-Commerce. The paper will end with an analysis of VE before projecting future directions for health of B2B and B2C in business.

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