Coal Production by Longwall mining- A Study and Analysis of Equipment Breakdown Cause Patterns
Krishna Reddy Bhimavarapu
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Coal production is a very complex process. It involves several causes of equipment breakdowns leading to down times. These down times reduce the production drastically depending up on their nature and type of breakdown. Ultimate result of these breakdowns is low productivity and stress on the managerial personal for repairing and bringing back the equipment into working condition. The present paper attempts to identify the causes of down times of equipment and to find out the inter relationships between them. To check for the association between the occurrences of C1 to C12 a bi-variate frequency table has been obtained from among the occurrences of the variables and a Chi-square test has been applied.
Optimal Asset Allocation Using Predicting Stock and Coin outputs in the Iranian Capital Market
Leila Torki, Mahmoud Botshekan, Soheila Mohamadghasemi
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One of the most important factors in deciding on investment is the amount of risk and output on capital assets. Choosing a set of optimal assets is often done by exchanging between risk and output, the higher the risk, so investors expect higher outputs. Portfolio optimization is about choosing the best combination of assets to maximize output on investment and minimize risk as much as possible. Therefore, one of the important steps in portfolio formation is to determine the optimal ratio or weight of assets to reduce the risk of investment portfolio. This important step is made by choosing the right strategy. The present study investigates the optimal allocation of assets (coins and stocks) using macroeconomic variables. The purpose of this study is to compare the performance of a predictability-based portfolio with a strategy-based portfolio (H H ). The data of this study were collected from internet databases stock exchange and central bank of Iran. The data are collected monthly from the beginning of March 2001 until the end of March 2017. In order to form predictability-based portfolios, first, out-of-sample stock and coin return forecasts were made by recursive and rolling regression models by five (24, 48, 60, 90, 120) month windows regression models. Then, by comparing the predictive power of the models within the sample, the optimal model is selected to predict the next periodic output and to predict the output on both stocks and gold. Then, using the predicted output on assets per month and in each window, two investment portfolios based on the variance mean strategy (investment strategy in tangent portfolio and variance-mean investment strategy with 3 and 5 aversion coefficient and another portfolio based on the minimum variance strategy have been performed and the performance of each of these portfolios with equal weight portfolios has been investigated through means comparison test, variance comparison test and Sharp Ratio. The results of the comparative test of variances and the Sharp ratio showed that the strategy of mean variance with a specified risk aversion coefficient (three and five) in all windows was able to defeat the strategy (H H ). The reason for the better performance of the mean variance strategy is that the underlying decision making is the predictability of asset outputs, and the weighting of each asset is based on the projected maximum output per month. The weighting of each asset per month is based on the maximum expected output.
Tourism Crises Management and the Role of Governments: Post-COVID-19 Tourism and Government Interventions, Case Study of China
Anastasia Belashov, Anthony Ward, PdD.
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Tourism is one of the major industries but also is a vulnerable venture. Currently tourism is severally impacted by
COVID-19 pandemic worldwide. Pandemics are known to effect civilizations since the ancient times. Coronavirus
pandemic is not the first one but so far, it is by far the greatest in its impact on economies, politics and other
aspects of human life. Tourism is especially hurt since travel acts as a major vehicle for spreading the virus and
thus, governments around the globe restrict tourism to prevent contamination. This study, conducted as a
qualitative and descriptive research, investigates government’s role in crisis management in tourism. An overview
of pandemics in historical perspective and government interventions in different crisis situations are included.
COVID-19, as a global pandemic has been chosen as a cataclysm for the case study. We focus on China since the
Chinese government has almost full control over every aspect of its citizens’ lives, including travel. Measures and
regulations implemented by Chinese government to control COVID-19 spread including full shut down of
domestic, outbound and inbound tourism are studied through government issued posts and announcements,
industry reports and Chinese media coverage. Current expansion of domestic tourism in China, future feasible
scenarios for Chinese outbound and inbound travel and possible applications of Chinese experience for other
countries are also discussed.
Italian Migration and Entrepreneurship’s Origins In the United States of America. A Business History Analysis From the Post Second World War Period to The Present Day
Vittoria Ferrandino, Valentina Sgro
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The opening of international markets following World War II highlighted the differences between territories at
regional and national level in terms of the attractiveness of economic activities, investment and human resources.
In this context, an important aspect concerned the entrepreneurial process: businesses and entrepreneurs have
played a leading role in the activation of the paths of economic growth on the product value, employment and
international competitiveness.
Covid-19, contact tracing and GDPR
Giuliana Amore
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Provisions recently issued relating to the Covid-19 pandemic spread emergency showed a considerable impact (also) about personal data processing and, consequently, on the right to their protection. Among the measures adopted (in several countries, including Italy) to cope the pandemic emergency, there are those based on collection and tracking of personal health data in order to control and contain the virus and in particular the so-called “Immuni” app, involving, prima facie, an invasive control in people’s lives: hence, once the terms and characteristics of this tracking system have been reconstructed, the need to identify its legal basis in light of the General Data Protection Regulation (GDPR) and, in the event of a positive outcome of this assessment, the guarantees capable to ensure the necessary balance between the protection of public health and the protection of the private sphere from excessive compression or intrusiveness.
The Impact of Remittances on Economic Growth: The Evidence from Morocco
MAKHLOUF Farid, NAAMANE Adil
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The purpose of this article is to contribute to the empirical literature and to enrich the debate on the impact of worker’s remittances on growth, in home countries. By using the VAR model, we analyzed the impact of the worker’s remittances transfers on the economic growth in Morocco. Impulse response functions and variance decomposition show that the worker’s remittances have a positive impact on GDP per capita. The results also show that remittances affect economic growth through financial development.
The adoption of electric vehicles: challenges and issues for a future research agenda
Lifeng Geng
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Sales of electric vehicles (EVs) grew rapidly in recent years. The vast literature on EV adoption, however, has generated regional, mixed, and sometimes contradictory results. A careful examination of the literature reveals overreliance on quantitative research methods and a dearth of qualitative, exploratory studies. The mixed findings may not stem directly from flaws in research methodology or research design, but rather reflect the inherent nature of the domain being studied. A research agenda in the tradition of qualitative, grounded theory is proposed.