scholarly journals Data analysis on Coronavirus spreading by macroscopic growth laws

2020 ◽  
Vol 31 (07) ◽  
pp. 2050103 ◽  
Author(s):  
P. Castorina ◽  
A. Iorio ◽  
D. Lanteri
Keyword(s):  
Growth Rate ◽  
Data Analysis ◽  
South Korea ◽  
Time Evolution ◽  
Epidemic Spreading ◽  
Daily Data ◽  
Large Growth ◽  
Gompertz Law ◽  
Growth Laws ◽  
Containment Policy

To evaluate the effectiveness of the containment on the epidemic spreading of the new Coronavirus disease 2019, we carry on an analysis of the time evolution of the infection in a selected number of different Countries, by considering well-known macroscopic growth laws, the Gompertz law, and the logistic law. We also propose here a generalization of Gompertz law. Our data analysis permits an evaluation of the maximum number of infected individuals. The daily data must be compared with the obtained fits, to verify if the spreading is under control. From our analysis, it appears that the spreading reached saturation in China, due to the strong containment policy of the national government. In Singapore a large growth rate, recently observed, suggests the start of a new strong spreading. For South Korea and Italy, instead, the next data on new infections will be crucial to understand if the saturation will be reached for lower or higher numbers of infected individuals.

scholarly journals Ostwald Growth Rate in Controlled Covid-19 Epidemic Spreading as in Arrested Growth in Quantum Complex Matter

2020 ◽  
Vol 5 (2) ◽  
pp. 23 ◽  
Author(s):  
Antonio Bianconi ◽  
Augusto Marcelli ◽  
Gaetano Campi ◽  
Andrea Perali
Keyword(s):  
Growth Rate ◽  
Metastable Phase ◽  
Quantitative Measure ◽  
Epidemic Spread ◽  
Epidemic Spreading ◽  
Oxygen Interstitial ◽  
S Factor ◽  
Successful Approach ◽  
Containment Policy ◽  
Complex Matter

Here, we focus on the data analysis of the growth of epidemic spread of Covid-19 in countries where different policies of containment were activated. It is known that the growth of pandemic spread at its threshold is exponential, but it is not known how to quantify the success of different containment policies. We identify that a successful approach gives an arrested phase regime following the Ostwald growth, where, over the course of time, one phase transforms into another metastable phase with a similar free energy as observed in oxygen interstitial diffusion in quantum complex matter and in crystallization of proteins. We introduce the s factor which provides a quantitative measure of the efficiency and speed of the adopted containment policy, which is very helpful not only to monitor the Covid-19 pandemic spread but also for other countries to choose the best containment policy. The results show that a policy based on joint confinement, targeted tests, and tracking positive cases is the most rapid pandemic containment policy; in fact, we found values of 9, 5, and 31 for the success s factor for China, South Korea, and Italy, respectively, where the lowest s factor indicates the best containment policy.

scholarly journals ECONOMIC ENVIRONMENT OF ARCTIC LIQUEFIED NATURAL GAS SUPPLIESTO THE ASIAN-PACIFIC REGION COUNTRIES UNDER THE END OF THE “TRADE WAR” BETWEEN THE USA AND CHINA

2020 ◽  
Vol 68 (2/2020) ◽  
pp. 12-21
Author(s):  
M. V. Ulchenko ◽  
Keyword(s):  
United States ◽  
Growth Rate ◽  
Natural Gas ◽  
South Korea ◽  
The United States ◽  
Liquefied Natural Gas ◽  
Asia Pacific ◽  
Russian Arctic ◽  
Pacific Region ◽  
Asia Pacific Region

Currently, the Asia-Pacific market is a priority goal for almost all major producers of liquefied natural gas(LNG). This is due to the relatively high price that local consumers are willing to pay, as well as the accelerated growth rate of natural gas consumption. At the same time, China is the main driver of growth in demand for LNGin the world, has concluded a trade agreement with the United States, which involves the purchase of energy resources worth more than $ 52 billion over two years. Given the decline in LNG prices, as well as increased competition, the issue of the prospects for sales of Russian Arctic gas on the market of the Asia-Pacific region becomes particularly relevant.The study provides a generalized assessment of the needs of the main importers of LNG ––China, South Korea and Japan, with a planning horizon of 4–5 years. The relatively high growth rates of the economy, partial rejection of nuclear energy, struggle to improve the environmental situation, as well as the desire to diversify supply routes explain the needs of the countries in the Asia-Pacific region for additional volumes of LNGin the near future. The analysis showed that both Japan and South Korea are interested in increasing the volume of imports of Russian arctic LNG, whose key advantages over most competitors are the price and relative proximity of sales markets. At the same time, the reduction in the number of operating gas drilling rigs in the United States indicates that it will not be possible to maintain the growth rate of LNG production at the level of 2018 and 2019.

Microstructural Evolution during the Directional Transient Solidification of a Hypomonotectic Al-0.9wt%Pb Alloy

2012 ◽  
Vol 730-732 ◽  
pp. 829-834
Author(s):  
Adrina P. Silva ◽  
Pedro R. Goulart ◽  
José Eduardo Spinelli ◽  
Amauri Garcia
Keyword(s):  
Growth Rate ◽  
Heat Flow ◽  
Thermal Parameters ◽  
Cooling Curves ◽  
Flow Conditions ◽  
Directionally Solidified ◽  
Microstructural Transition ◽  
Transient Heat Flow ◽  
Growth Laws ◽  
Casting Length

In the present study a hypomonotectic Al-0.9wt%Pb alloy was directionally solidified under transient heat flow conditions and the microstructure evolution was analyzed. The solidification thermal parameters such as the growth rate, the cooling rate and the temperature gradient were experimentally determined by cooling curves recorded by thermocouples positioned along the casting length. The monotectic structure was characterized by metallography and a microstructural transition was observed. From the casting cooled surface up to a certain position in the casting the microstructure was characterized by well-distributed Pb-rich droplets in the aluminum-rich matrix, followed by a mixture of fibers and strings of pearls from this point to the top of the casting. The interphase spacing (λ) and the diameter of Pb-rich particles were also measured along the casting length and experimental growth laws relating these microstructural features to the experimental thermal parameters are proposed.

Technological progress, non-price factors competitiveness, and changes in trade income elasticities: empirical evidence from South Korea and Hong Kong

2020 ◽  
pp. 1-26
Author(s):  
Marco Flávio Cunha Resende ◽  
Vitor Leone ◽  
Daniele Almeida Raposo Torres ◽  
Simeon Coleman
Keyword(s):  
Growth Rate ◽  
Hong Kong ◽  
South Korea ◽  
Empirical Evidence ◽  
Technological Progress ◽  
Innovation System ◽  
Balance Of Payments ◽  
Income Elasticities ◽  
Long Run ◽  
Catch Up

In the balance-of-payments-constrained growth model literature, income elasticities (IEs) are considered as the crucial element determining a country's long-run growth rate. Although the extant literature accepts that technology matters for IEs magnitude, explanations linking technology and IEs magnitude are limited. In this paper, we make use of the National Innovation System (NIS) concept from the Evolutionary School to explain the channels through which the size of a country's IEs is influenced by the level of development of its NIS, which in turn is a channel through which the non-price competitiveness factors work. Additionally, we empirically test the hypothesis that the catch-up allowed by NIS developments achieved in South Korea and Hong Kong improved their IEs over the 1980–1995 period. Our empirical results suggest a link between the level of NIS development and the size of the IEs.

The evolution and bifurcation of a pendant drop

1994 ◽  
Vol 278 ◽  
pp. 83-100 ◽  
Author(s):  
R. M. S. M. Schulkes
Keyword(s):  
Experimental Data ◽  
Growth Rate ◽  
Satisfactory Agreement ◽  
Growth Rates ◽  
Pendant Drop ◽  
Large Growth ◽  
Comparison With Experimental Data

In this paper we calculate how a pendant drop evolves at the end of a nozzle when the volume of the drop increases steadily with time. We find that the character of the evolution is strongly dependent on the growth rate of the drop and the radius of the nozzle. Typically we find that once the drop has become unstable, two bifurcations occur shortly after each other when the growth rate of the drop is slow. For large growth rates the bifurcations are well-separated in time. We are able to calculate the volumes of the drops after the bifurcations. A comparison with experimental data shows a satisfactory agreement.

scholarly journals The Role of Eco-Friendly Edible Insect Restaurants in the Field of Sustainable Tourism

2020 ◽  
Vol 17 (11) ◽  
pp. 4064 ◽  
Author(s):  
Jinsoo Hwang ◽  
Hyunjoon Kim ◽  
Ja Young Choe
Keyword(s):  
Data Analysis ◽  
Theoretical Model ◽  
South Korea ◽  
Behavioral Intentions ◽  
Word Of Mouth ◽  
Sustainable Tourism ◽  
Positive Influence ◽  
Edible Insect

The purpose of this study is to apply the concept of a green image in order to explore how to form behavioral intentions in the context of eco-friendly edible insect restaurants. This study analyzed 444 samples collected in South Korea in order to evaluate the theoretical model including 12 hypotheses. The data analysis results showed that a green image has a positive influence on attitude. In addition, attitude helps to increase desire, which in turn positively affects two sub-dimensions of behavioral intentions, such as intentions to use and word-of-mouth intentions.

scholarly journals Anxiety of Older Persons Living Alone in the Community

Healthcare ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 287 ◽  
Author(s):  
Jinna Yu ◽  
Kwisoon Choe ◽  
Youngmi Kang
Keyword(s):  
Mental Health ◽  
Data Analysis ◽  
South Korea ◽  
Mental Health Problem ◽  
Health Problem ◽  
Older Persons ◽  
Phenomenological Approach ◽  
Interview Data ◽  
Living Alone ◽  
Common Mental Health Problem

Anxiety is a common mental health problem among older persons, and the prevalence is higher in those who live alone than those who live with others. This study aimed to explore the experiences of anxiety in older persons living alone. A descriptive phenomenological approach was used to collect and analyze the interview data from 15 older persons (5 males, 10 females) living alone in Seoul, South Korea. Four main themes emerged from the data analysis: fear of being alone, concern about having an aged body, apprehension mixed with depression and loneliness, and fear of economic difficulties. These findings indicate that older persons living alone should receive continuous attention to prevent them from being neglected and their anxiety from worsening. Above all, it is vital to ensure comprehensive support for older persons living alone to alleviate their anxiety.

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