scholarly journals Stability of a reaction–diffusion alcohol model with the impact of tax policy

2017 ◽  
Vol 74 (4) ◽  
pp. 613-633 ◽  
Author(s):  
Cheng-Cheng Zhu ◽  
Jiang Zhu
Keyword(s):  
Tax Policy ◽  
Reaction Diffusion ◽  
The Impact

TAX POLICY IN THE FIELD OF EXCISE TAXES ON TOBACCO PRODUCTS IN RUSSIA

2020 ◽  
Vol 3 (3) ◽  
pp. 36-40
Author(s):  
A. A. IDRISOV ◽  
Keyword(s):  
Tax Policy ◽  
Negative Impact ◽  
Tobacco Products ◽  
Excise Tax ◽  
Trade Relations ◽  
Excise Taxes ◽  
Tax Revenues ◽  
Eurasian Economic Union ◽  
Economic Union ◽  
The Impact

The article is devoted to the analysis of the features of excise tax revenues to the budget of the Russian Federation. The analysis of the negative impact on the economy of the distribution of illegal tobacco prod-ucts - cigarettes, as well as the impact of new substitutes for this product. The issues of harmonization of the excise policy of the countries of the Eurasian Economic Union and the regulation of the tax policy in the field of excise taxes on tobacco products, the introduction of new excise taxes on electronic substitutes are considered. These measures are aimed at creating sustainable export-import foreign trade relations and a single market of legalized smoking products. The article is aimed at developing recommendations on strengthening the economy of tobacco production in the context of the creation of the Eurasian Economic Union, as well as on increasing tax revenues from them.

scholarly journals The influence of density in population dynamics with strong and weak Allee effect

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
Kamrun Nahar Keya ◽  
Md. Kamrujjaman ◽  
Md. Shafiqul Islam
Keyword(s):  
Population Dynamics ◽  
Allee Effect ◽  
Global Bifurcation ◽  
Reaction Diffusion ◽  
Logistic Growth ◽  
Allee Effects ◽  
Reaction Diffusion Model ◽  
Positive Steady States ◽  
The Stability ◽  
The Impact

AbstractIn this paper, we consider a reaction–diffusion model in population dynamics and study the impact of different types of Allee effects with logistic growth in the heterogeneous closed region. For strong Allee effects, usually, species unconditionally die out and an extinction-survival situation occurs when the effect is weak according to the resource and sparse functions. In particular, we study the impact of the multiplicative Allee effect in classical diffusion when the sparsity is either positive or negative. Negative sparsity implies a weak Allee effect, and the population survives in some domain and diverges otherwise. Positive sparsity gives a strong Allee effect, and the population extinct without any condition. The influence of Allee effects on the existence and persistence of positive steady states as well as global bifurcation diagrams is presented. The method of sub-super solutions is used for analyzing equations. The stability conditions and the region of positive solutions (multiple solutions may exist) are presented. When the diffusion is absent, we consider the model with and without harvesting, which are initial value problems (IVPs) and study the local stability analysis and present bifurcation analysis. We present a number of numerical examples to verify analytical results.

scholarly journals Pandemics and Tax Innovations: What can we Learn from History?

2020 ◽  
Vol 6 (3) ◽  
pp. 270-297
Author(s):  
A. I. Pogorletskiy ◽  
◽  
F. Söllner ◽  
Keyword(s):  
Tax Policy ◽  
Large Scale ◽  
Inductive Method ◽  
Tax Administration ◽  
The European Union ◽  
The Past ◽  
Tax Incentive ◽  
Tax Systems ◽  
The Impact ◽  
Tax Regulation

In this article, we shall see how pandemics of deadly diseases have changed tax systems over the past two millennia, each time leading to the emergence of new forms of taxation and tax administration. The purpose of the article is to prove that pandemics and the most notable innovations in tax policy are closely interrelated and that the consequences of the largest pandemics in the history of mankind are new approaches to the organization of national tax systems as well as the formation of interstate tax regulation. The lessons from history can be applied to the current corona crisis and may help us devise the appropriate anti-crisis tax policy. The study is based on the historical empirical-inductive method applied to reliable facts of the past related to pandemics and taxation. We trace the evolution of tax policy under the impact of the most significant pandemics and identify patterns of taxation and tax administration that are specific to their eras and are still relevant in the course of the pandemic COVID-19. Our analysis allows us to draw the following conclusions: (1) There is a historical link between pandemics and tax regulation. Many tax innovations originated in response to the consequences of large-scale epidemics of deadly diseases. (2) Many of the tax incentive tools used today in the fight against the corona crisis have already been used during previous pandemics so that we may learn from the experience of earlier times. (3) The COVID-19 pandemic can be expected to have several important consequences for taxation and public finance: innovations in tax administration with an emphasis on remote fiscal audits and digital control; innovations in the taxation of digital companies and their operations at the national and international level; possibly fundamental changes in the tax system of the European Union; and possibly a return of the inflation tax.

A Study on the Impact of Fiscal and Tax Policy on R&D Innovation in SMEs: Evidence from China

2021 ◽  
Vol 17 (2) ◽  
pp. 57-68
Author(s):  
Yan-Xu Yan ◽  
Yeong-Gil Kim ◽  
Hyun-Jung Shin
Keyword(s):  
Tax Policy ◽  
The Impact

scholarly journals Letter to Turing

2018 ◽  
Vol 36 (6) ◽  
pp. 73-94 ◽  
Author(s):  
Giuseppe Longo
Keyword(s):  
Scientific Method ◽  
Reaction Diffusion ◽  
Neural Nets ◽  
Scientific Letter ◽  
Alan Turing ◽  
Diffusion Dynamics ◽  
Human Attitude ◽  
Scientific Quest ◽  
The Impact ◽  
Made In

This personal, yet scientific, letter to Alan Turing, reflects on Turing's personality in order to better understand his scientific quest. It then focuses on the impact of his work today. By joining human attitude and particular scientific method, Turing is able to “immerse himself” into the phenomena on which he works. This peculiar blend justifies the epistolary style. Turing makes himself a “human computer”, he lives the dramatic quest for an undetectable imitation of a man, a woman, a machine. He makes us see the continuous deformations of a material action/reaction/diffusion dynamics of hardware with no software. Each of these investigations opens the way to new scientific paths with major consequences for contemporary live and for knowledge. The uses and the effects of these investigations will be discussed: the passage from classical AI to today's neural nets, the relevance of non-linearity in biological dynamics, but also their abuses, such as the myth of a computational world, from a Turing-machine like universe to an encoded homunculus in the DNA. It is shown that these latter ideas, which are sometimes even made in Turing's name, contradict his views.

Reflood Oxidation Model Based on Reaction-Diffusion Equations

2010 ◽  
Author(s):  
Xiaoqiang He ◽  
Hongxing Yu ◽  
Guangming Jiang
Keyword(s):  
Metal Layer ◽  
Reaction Diffusion ◽  
Reaction Diffusion Equations ◽  
Diffusion Equations ◽  
Severe Accident ◽  
Model Based ◽  
Oxidation Model ◽  
The Impact ◽  
Relap5 Code ◽  
Good Agreement

An important accident management measure in PWRs is the injection of water to cool the degrading core, in which process the temperature and hydrogen production will significantly increase due to enhanced oxidation after shattering of zircaloy fuel rod. This phenomenon can be described by Zr oxidation model and shattering model. The process of Zr oxidation is usually represented by parabolic rate correlations. But, after consumption of primary β-Zr, or in steam starvation conditions, the correlation approach is restricted. Besides, using this approach, it is impossible to obtain detailed oxygen distribution in the cladding which impacts the detailed mechanical behavior, such as shattering of cladding. The shattering of cladding is mainly contributed by deep cracks penetrating the oxide layer as well as the adjacent metallic. In SCDAP/RELAP5, the shattering criterion is relevant to the thickness of β-Zr, the cladding temperature, and the cooldown rate. After shattering of cladding, the oxide scale is simply removed. This shattering criterion deviates from the experiment of Chung and Kassner when the maximum cladding temperature exceeds 1560 K, and the model can’t reveal the impact of the cladding surface temperature before cooldown on cladding conditions after shattered. An oxidation model based on reaction-diffusion equations at the temperature range from 923K to 2098K is developed in this study. By comparison with experimental data, the model shows reasonable results. Based on the oxidation model, the advanced shattering criterion is adopted, and a new empirical model to describe the cladding conditions after shattered is proposed. In present shattering model, R(T, m), which is the ratio between the area of new crack surfaces in the metal layer and the area of outer cladding surface, is the function of T (the temperature of the cladding surface before cooldown) and m (the thickness of the metal layer). With the help of single-rod QUENCH experiment, the preliminary expression of R(T, m) is obtained, and the results are in a good agreement qualitatively with the observation in this experiment. Further activities should focus on the impact of m and T on R(T, m), which needs more detailed single-rod experiments. Those developed models can be implemented into the SCDAP/RELAP5 code easily and used in the severe accident analysis in the future.

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