A New Class of Dynamic Macrosystem Models with Self-Reproduction

1989 ◽  
Vol 21 (6) ◽  
pp. 739-751 ◽  
Author(s):  
Yu S Popkov
Keyword(s):  
Relaxation Time ◽  
Structural Analysis ◽  
The Self ◽  
Mathematical Programming Problem ◽  
System Of Differential Equations ◽  
New Class ◽  
Proposed Model ◽  
Reproduction Process ◽  
Distribution Process ◽  
Demographic Modelling

The author considers a class of macrosystems where the relaxation time of the distribution process of elements is significantly less than the relaxation time of the self-reproduction process. The proposed model of such macrosystems defines the system of differential equations with nonlinearity generated by the solution of a mathematical programming problem with an entropy objective function. Methods for the structural analysis of this model are considered, and applications to demographic modelling, biological dynamics, and chemical kinetics are given.

Analysis of a New Class of Impulsive Implicit Sequential Fractional Differential Equations

2020 ◽  
Vol 21 (6) ◽  
pp. 571-587 ◽  
Author(s):  
Akbar Zada ◽  
Sartaj Ali ◽  
Tongxing Li
Keyword(s):  
Differential Equations ◽  
Fractional Order ◽  
Fractional Differential Equations ◽  
Sufficient Conditions ◽  
Uniqueness Of Solutions ◽  
Integer Order ◽  
New Class ◽  
Proposed Model ◽  
Fractional Differential ◽  
Sequential Fractional Differential Equations

AbstractIn this paper, we study an implicit sequential fractional order differential equation with non-instantaneous impulses and multi-point boundary conditions. The article comprehensively elaborate four different types of Ulam’s stability in the lights of generalized Diaz Margolis’s fixed point theorem. Moreover, some sufficient conditions are constructed to observe the existence and uniqueness of solutions for the proposed model. The proposed model contains both the integer order and fractional order derivatives. Thus, the exponential function appearers in the solution of the proposed model which will lead researchers to study fractional differential equations with well known methods of integer order differential equations. In the last, few examples are provided to show the applicability of our main results.

Vibration-Induced Loosening Performance of Preloaded Threaded Fasteners

2010 ◽  
Author(s):  
Xianjie Yang ◽  
Sayed Nassar
Keyword(s):  
Nonlinear Model ◽  
Excitation Amplitude ◽  
The Self ◽  
Transverse Displacement ◽  
Transverse Loading ◽  
Threaded Fasteners ◽  
Bolt Preload ◽  
Proposed Model ◽  
Number Of Cycles ◽  
Insight Into

In an effort to establish a theoretical outline of a criterion for preventing the vibration-induced loosening of preloaded threaded fasteners, this paper provides an experimental and analytical insight into the effect of the initial bolt preload and the excitation amplitude on the self loosening performance of cap screw fastener. A nonlinear model is used for predicting the clamp load loss caused by the vibration-induced loosening of cap screw fasteners under cyclic transverse loading. Experimental verification was conducted on the twisting torque variation and the effect of the preload level and transverse displacement amplitude. Comparison of the experimental and analytical results on the clamp load loss with the number of cycles verifies that the proposed model accurately predicts self-loosening performance.

Theoretical Tire Model Considering Two-Dimensional Contact Patch for Force and Moment

2021 ◽  
Author(s):  
Y. Nakajima ◽  
S. Hidano
Keyword(s):  
Finite Element Method ◽  
Shear Force ◽  
The Self ◽  
Slip Angle ◽  
Force Distribution ◽  
Two Dimensional ◽  
Tire Model ◽  
Side Force ◽  
Contact Patch ◽  
Proposed Model

ABSTRACT The new theoretical tire model for force and moment has been developed by considering a two-dimensional contact patch of a tire with rib pattern. The force and moment are compared with the calculation by finite element method (FEM). The side force predicted by the theoretical tire model is somewhat undervalued as compared with the FEM calculation, while the self-aligning torque predicted by the theoretical tire model agrees well with the FEM calculation. The shear force distribution in a two-dimensional contact patch under slip angle predicted by the proposed model qualitatively agrees with the FEM calculation. Furthermore, the distribution of the adhesion region and sliding region in a two-dimensional contact patch predicted by the theoretical tire model qualitatively agrees with the FEM calculation.

scholarly journals Duration Perception Versus Perception Duration: A Proposed Model for the Consciously Experienced Moment

2019 ◽  
Vol 7 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Lachlan Kent
Keyword(s):  
Information Theory ◽  
Prediction Error ◽  
Intermediate Stage ◽  
The Self ◽  
Global Integration ◽  
Candidate Model ◽  
Time Space ◽  
Proposed Model ◽  
Concrete Objects ◽  
Integrated Information Theory

Duration perception is not the same as perception duration. Time is an object of perception in its own right and is qualitatively different to exteroceptive or interoceptive perception of concrete objects or sensations originating within the self. In reviewing evidence for and against the experienced moment, White (2017, Psychol. Bull., 143, 735–756) proposed a model of global integration of information dense envelopes of integration. This is a valuable addition to the literature because it supposes that, like Tononi’s (2004, BMC Neurosci., 5, 42) Integrated Information Theory, consciousness is an integral step above perception of objects or the self. Consciousness includes the perception of abstract contents such as time, space, and magnitude, as well as post-perceptual contents drawn from memory. The present review takes this logic a step further and sketches a potential neurobiological pathway through the salience, default mode, and central executive networks that culminates in a candidate model of how duration perception and consciousness arises. Global integration is viewed as a process of Bayesian Prediction Error Minimisation according to a model put forward by Hohwy, Paton and Palmer (2016, Phenomenol. Cogn. Sci., 15, 315–335) called ‘distrusting the present’. The proposed model also expresses global integration as an intermediate stage between perception and memory that spans an approximate one second duration, an analogue of Wittmann’s (2011, Front. Integr. Neurosci., 5, 66) experienced moment.

A constitutive model for Fe-based shape memory alloy considering martensitic transformation and plastic sliding coupling: Application to a finite element structural analysis

2012 ◽  
Vol 23 (10) ◽  
pp. 1143-1160 ◽  
Author(s):  
Walid Khalil ◽  
Alain Mikolajczak ◽  
Céline Bouby ◽  
Tarak Ben Zineb
Keyword(s):  
Finite Element ◽  
Phase Transformation ◽  
Structural Analysis ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Internal Variables ◽  
Thermomechanical Loading ◽  
Proposed Model ◽  
Numerical Tool

In this article, we propose a finite element numerical tool adapted to a Fe-based shape memory alloy structural analysis, based on a developed constitutive model that describes the effect of phase transformation, plastic sliding, and their interactions on the thermomechanical behavior. This model was derived from an assumed expression of the Gibbs free energy taking into account nonlinear interaction quantities related to inter- and intragranular incompatibilities as well as mechanical and chemical quantities. Two scalar internal variables were considered to describe the phase transformation and plastic sliding effects. The hysteretic and specific behavior patterns of Fe-based shape memory alloy during reverse transformation were studied by assuming a dissipation expression. The proposed model effectively describes the complex thermomechanical loading paths. The numerical tool derived from the implicit resolution of the nonlinear partial derivative constitutive equations was implemented into the Abaqus® finite element code via the User MATerial (UMAT) subroutine. After tests to verify the model for homogeneous and heterogeneous thermomechanical loadings, an example of Fe-based shape memory alloy application was studied, which corresponds to a tightening system made up of fishplates for crane rails. The results we obtained were compared to experimental ones.

scholarly journals A Family of Loss Distributions with an Application to the Vehicle Insurance Loss Data

2019 ◽  
pp. 731-744 ◽  
Author(s):  
Zubair Ahmad Ahmad ◽  
Eisa Mahmoudi Mahmoudi ◽  
G. G. Hamedani
Keyword(s):  
Maximum Likelihood ◽  
Financial Risk ◽  
Maximum Likelihood Estimates ◽  
Model Parameters ◽  
Data Set ◽  
Loss Model ◽  
New Class ◽  
Proposed Model ◽  
Loss Distributions ◽  
Loss Data

Actuaries are often in search of nding an adequate loss model in the scenario of actuarial and financial risk management problems. In this work, we propose a new approach to obtain a new class of loss distributions. A special sub-model of the proposed family, called the Weibull-loss model isconsidered in detail. Some mathematical properties are derived and maximum likelihood estimates of the model parameters are obtained. Certain characterizations of the proposed family are also provided. A simulation study is done to evaluate the performance of the maximum likelihood estimators. Finally, an application of the proposed model to the vehicle insurance loss data set is presented.

scholarly journals Let Them Learn

2021 ◽  
Vol 7 (2) ◽  
pp. 230-260
Author(s):  
Christian Martinez
Keyword(s):  
Critical Analysis ◽  
Oil And Gas ◽  
Common Law ◽  
Case Law ◽  
The Self ◽  
Self Assessment ◽  
Proposed Model ◽  
Design Build ◽  
Free Flow Of Information ◽  
Flow Of Information

Organizations often conduct probing self-studies to review internally existing policies, procedures, and business methods. Yet, despite an increasing social need for these studies, the Texas legislature has yet to construct a privilege designed to protect an organization from being harmed from these studies by adverse litigants. The self-critical analysis privilege, or SCAP, is an alluring, common law doctrine that protects the free flow of information sharing through an organization’s self-assessment. This Comment proposes a model statute for the codification of the SCAP for the consideration of the Texas legislature. This model statute is not a general codification of the privilege. Instead, the statute is meant to apply only to Texas’s Design-Build industry. This Comment discusses the significant policy considerations supporting the SCAP and analyzes case law to derive proper drafting language. Although this proposed model statute narrowly applies to Texas’s Design-Build industry, the hope is to have a workable statute that could apply to general products, oil and gas, and other property related industries.

Loading and Structural Analysis of the Self-Aligning HyStOH Floating Wind Turbine Concept

2019 ◽  
Author(s):  
Andreas Manjock ◽  
Markus S. Starr
Keyword(s):  
Structural Analysis ◽  
Wind Turbine ◽  
The Self ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Structure Representation ◽  
Flexible Support ◽  
Analysis Methodology ◽  
Elastic Load ◽  
Load Simulation

Abstract This paper summarizes the results of the implementation and verification of a hydro-aero-servo-elastic load simulation model for a self-aligning floating offshore wind turbine (FOWT) combined with a structural analysis methodology of this FOWT structure. The main focus is a comparison of a rigid and a flexible support structure representation in the load simulation. This investigation is part of the multiparty project for the ‘Hydrodynamic and Structural Optimization of a Semi-submersible Offshore Wind Turbine’ (HyStOH), joining partners from science and industry and financially supported by the German Ministry of Economics Affairs and Energy, BMWi (Bundesministerium für Wirtschaft und Energie).

How does political skill lead to job and organization engagement? Role of self-evaluations

2020 ◽  
Vol 39 (7/8) ◽  
pp. 895-910
Author(s):  
Ameer A. Basit
Keyword(s):  
Employee Engagement ◽  
Organizational Identification ◽  
Structural Equation ◽  
Political Skill ◽  
The Self ◽  
Equation Modeling ◽  
Survey Method ◽  
Conservation Of Resources ◽  
Content Type ◽  
Proposed Model

PurposePolitical skill is a valued resource employees use to achieve success. Earlier research has mostly focused on the effect of political skill on others rather than on the self of the politically skilled individuals. Specifically, there is disconnect between political skill and employee engagement research as both these fields have been growing in isolation. Drawing from theories of engagement and conservation of resources, this study bridges this gap in knowledge by investigating how political skill leads to job and organization engagement of politically skilled employees via impacting their self-evaluations of organization-based self-esteem (OBSE) and organizational identification.Design/methodology/approachUsing a survey method, data were obtained from 188 employees who worked in three private schools of Lahore, Pakistan. Structural equation modeling was used to test the proposed model.FindingsThis study found that individuals who used political skill by practicing social astuteness, interpersonal influence, networking and sincerity rated themselves high in OBSE and organizational identification. As a consequence, high OBSE enhanced their job engagement, whereas high organizational identification increased their organization engagement.Originality/valueThis study is one of the first studies to present political skill as a driver of job and organization engagement. It reveals that the self-evaluations of OBSE and organizational identification mediate the political skill–engagement relations in unique manners.

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