bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal Conductivity of CNT - Wated Nanofluids: a Review
Authors: Akhilesh M. , Santarao K. , Babu M. V. S. 
Published: August 2020

Abstract
In heat transportation applications, water is most commonly used fluid. The efficiency of equipment used in these applications depends on thermal characteristics of water used. The thermal characteristics of water could be upgraded by suspending high thermal conducting solid nanoparticles. In this paper an attempt has been made to know how the use of surfactants and functionalization of carbon nanotube walls can affect the thermal characteristics and stability of nanofluid. A thorough analysis of collected literature revealed that carbon nanotubes have much higher thermal conductivity than any other nanoparticles and hence improve the thermal properties of water when suspended in them. Further it is concluded that suspension of carbon nanotubes in water requires use of surfactant or functionalization of carbon nanotube walls with proper group. By setting optimum pH and better dispersion, better thermal conductivity is possible. Experimental studies in the literature survey reveal that chemical stabilization techniques and physical stabilization techniques together decide the stability of the nanofluid.
An Axisymmetric Contact Problem of an Elastic Layer on a Rigid Circular Base
Authors: Kebli B. , Berkane S. , Guerrache F. 
Published: August 2020

Abstract
An analytical solution is presented to a doubly mixed boundary value problem of an elastic layer partially resting on a rigid smooth base. A circular rigid punch is applied to the upper surface of the medium where the contact is supposed to be smooth. The case of the layer with a cylindrical hole was considered by Toshiaki and all [5]. The studied problem is reduced to a system of dual integral equations using the Boussinesq stress functions and the Hankel integral transforms. With the help of the Gegenbauer formula we get an infinite algebraic system of simultaneous equations for calculating the unknown function of the problem. The truncation method is used for getting the system coefficients. A closed form solution is given for the displacements, stresses and the stress singularity factors. The stresses and displacements are then obtained as Bessel function series. For the numerical application we give some conclusions on the effects of the radius of the punch with the rigid base and the layer thickness on the displacements, stresses, the load and the stress singularity factors are discussed.
Mechanical Properties of Sisal Fibre Reinforced Polymer Matrix Composite
Authors: Francis A. , Rajaram S. , Mohanakrishnan A. , Ashok B. 
Published: August 2020

Abstract
The composite materials plays a vital role in increase the strength and weight reduction purpose. The natural fibers increase the additional strength to the composites. This paper is related to the mechanical properties of the sisal fiber reinforced composites and it is compared with the another preparation of sisal fiber reinforced composite. The graphs shows the comparison about the mechanical properties on the fiber reinforced composites. The strength can be improved by using some melted polypropylene to increase the bonding between the matrix and the fiber. The sample material is immersed in water for twenty four hours and at the same time the properties also measured by using various testing methods. The final comparison indicates the better process for the preparation of the composite.
Rotation, Initial Stress, Gravity and Electromagnetic Field Effect on P Wave Reflection from Stress-Free Surface Elastic Half-Space with Voids under Three Thermoelastic Models
Authors: Abo-Dahab S. M. , Rida S. Z. , Mohamed R. A. , Kilany A. A. 
Published: August 2020

Abstract
The present paper is devoted to investigate the influence of the rotation, thermal field, initial stress, gravity field, electromagnetic and voids on the reflection of P wave under three models of generalized thermoelasticity: Classical and Dynamical coupled model (CD), Lord-Shulman model (LS), Green-Lindsay model (GL), The boundary conditions at stress-free thermally insulated surface are satisfied to obtain Algebraic system of four equations in the reflection coefficients of various reflected waves. It is shown that there exist four plane waves; P
1, P
2, P
3 and P
4. In addition, the reflection coefficients from insulated and isothermal stress-free surface for the incident P wave are obtained. Finally, numerical values of the complex modulus of the reflection coefficients are visualized graphically to display the effects of the rotation, initial stress, gravity field magnetic field, thermal relaxation times and voids parameters.
Growth, structural and optical properties of novel nonlinear optical potassium phthalate di lithium borate (KPDLiB) single crystals
Authors: Mohanraj K. , Balasubramanian D. , Jhansi N. 
Published: August 2020

Abstract
Novel nonlinear optical semi-organic, potassium phthalate di lithium borate (KPDLiB) single crystals were successfully grown by the slow solvent evaporation technique. Good crystalline nature and an orthorhombic structure were confirmed by powder X-ray diffraction and single crystal X-ray diffraction studies. The functional groups of KPDLiB were identified using FT-IR spectrum recorded in the range of 4000 cm−1 to 450 cm−1. UV-Vis spectrum showed transmitting ability of the crystals in the entire visible region. The photoluminescence spectrum exhibited good fluorescence emission in a visible region at 384 nm, 416 nm and 578 nm. The second harmonic generation efficiency of the grown crystal was evaluated from Kurtz powder technique.
Determining the Permissible Longwall Face Advance in the Protective Pillar Conditioning the Liquidation of a Mining Shaft
Authors: Mielimąka Ryszard , Kleta Henryk 
Published: August 2020

Abstract
The presented research subject involved the assessment of the possibility of mining operations within the area of shaft protection pillar with simultaneous liquidation of the shaft. In such a situation, the basic condition is to avoid damage to shaft lining, which can hinder or even prevent safe liquidation of the shaft by backfilling. The procedure to follow in order to assess the possibility and scope of mining exploitation within the shaft protection pillar is demonstrated on the example of shaft X. The applied assessment method involving the possibility and scope of mining exploitation within the protective pillar of the shaft was based on the forecast of rock mass deformation at the shaft site, which was the basis to calculate vertical stresses in the shaft lining and then to compare them with permissible values. The carried out calculations allowed us to determine the permissible face advance of longwall No. 5 at which no damage to the lining and its equipment would occur, ensuring the planned safe liquidation of the shaft by backfilling.
Methods and Proposals for Meeting Energy Needs
Authors: Grebski Wes , Czerwiński Stefan , Kania Jan 
Published: August 2020

Abstract
The article includes a comparative analysis of different methods of solving energy problems especially meeting the demand for electricity. Energy problems became a global concern due to the rapid increase in the world population. Energy consumption reflects the habits of the society and the nature of the economy. The focus of the article is the analysis of the United States (USA) energy economy in terms of meeting the needs of industry and society. It includes a comparison of costs of generating electricity obtained from various sources. It also includes an analysis of opportunities and threats related to the energy sector’s dependence on individual energy sources. Meeting the demand for electricity cannot be solved by increasing only the energy generation. The cost of increasing electricity production is always higher compared to increasing energy efficiency. The impact of energy efficiency of devices on energy management was also assessed. The publication also contains practical conclusions and recommendations regarding energy management on a global scale.
The Influence of an Operating Conditions on the Friction Coefficient in Transportation Machines Drives
Authors: Kasza Piotr , Kulinowski Piotr , Zarzycki Jacek 
Published: August 2020

Abstract
The publication presents the construction of the station for testing the friction coefficient under high pressure and low slip velocity values. These conditions of cooperation of friction pairs occur in the drives of transport machines such as belt conveyors and suspended monorails. The value of the friction coefficient, depending on the operating conditions such as moisture and rock or coal dust pollution, has a significant impact on the correct and efficient operation of such drives. The features of the station allow mapping the operating conditions on a laboratory scale. As part of the research, appropriate friction samples made of rubber or polyurethane were prepared. Referring to the conditions of conveyor operation and conditions of contact of the conveyor belt with the drive drum, the values of unit pressures and values of slip speed occurring in the drum drive of the belt conveyor were determined. A series of laboratory tests were carried out for the friction pair rubber drum lining – conveyor belt cover. The tests were carried out for four different states of friction vapor surfaces, namely for dry and wet samples, as well as for samples in clean or contaminated with stone dust. As a result of the tests, the values of friction coefficients for various surface states were determined, which will be valuable information for designers of friction drive systems of transport devices.
Rehabilitation of Post-Mining Areas in the Bohumin City Area (Czech Republic). Case Study
Authors: Biały Witold , Moni Vlastimil , Gibesova Beata , Stalmachova Barbara , Mikolas Milan 
Published: August 2020

Abstract
Rehabilitation of post-industrial areas involves many areas. The area after hard coal mines, requires many specific actions and funds in order to eliminate any remnants of the former infrastructure that is located in this area. The area of Upper Silesia, which includes areas on both the Polish and Czech borders, belongs to the area where the process of underground hard coal mining is being extinguished. As a result of the completion of mining works, the mine areas and adjacent sites begin to undergo transformations. Thus, the landscape of this area changes, various types of land, residential buildings and roads are destroyed. The activities related to restoring the utility value to degraded areas should be carried out consistently, primarily from their inhabitants’ perspective. The rehabilitation of post-mining area and its proper management can bring great benefits to the city and its inhabitants in the future. The publication presents a proposal for land development solutions for the former hard coal mine in Bohumin, Vrbice district in the Czech Republic.
Subsidies as Financing Opportunities – the Development of Renewable Energy Sources in Poland
Authors: Maruszewska Ewa W. , Navickas Kęstutis , Navickienė Renata 
Published: August 2020

Abstract
As Poland is considered a coal country, renewable energy resources still do not have a significant share in energy production. Further, 14% contribution of renewable energy to total primary energy production in 2020 is endangered. Thus, in order to speed up with renewable energy sources new actions should be stimulated. The aim of the article is to describe the most popular renewable energy installations in Poland and further to search for a case study indicating that an investment in renewable sources is profitable without financial support. The results indicate that prior literature does not present any analysis of profitable renewable energy investment without financial support. It states the need for regulators to implement additional financial support not only on the European Union level but also on the national one.
Art and Religion as Invitation. An Exploration Based on John Dewey’s Theory of Experience and Imagination
Authors: Alma Hans 
Published: August 2020

Abstract
In this essay, the relation between art and religion is explored using the concepts experience and imagination as understood by the American philosopher John Dewey. In Dewey’s view, experience involves both the experiencer and the experienced: it is a phenomenon of the in-between. When we are really touched by what we meet in interacting with our physical and social surroundings, experience acquires an aesthetic quality that opens us to the value and the potential of what we perceive. We can see the factual in light of the possible, thus enriching it with new layers of meaning. We experience this as resonance between us and the world. It is the work of the imagination. Due to their imaginative capacity, humans can aspire to a ‘good life’. This aspiration is discussed in terms of invitation and response. Can we experience ourselves as being invited to respond to this unruly world with attachment and care? Here art and religion come into play. Art is understood as the domain of the possible: it explores the world behind or beyond what we usually accept as fact. An aesthetic experience acquires religious quality when it evokes in us an ideal that guides our sense of self and world, stimulating us to realize our ideals in daily actions. If inspired by imagination, art and religion may evoke intense experiences of resonance and invite us to new ways of connecting and transformative action. This is explored with the help of a hermeneutical circle, a ‘cycle of imagination’.
Literatura De Controversia Religiosa Judío-Cristiana Medieval En Portugal (Siglos Xiii-Xv): Estado De La Cuestión. Discursos Y Motivaciones
Authors: Tavares Alice 
Published: August 2020

Abstract
The case study presented in this article is an analysis of Portuguese literary manuscripts which deal with religious Jewish controversies during the Middle Ages (13th to the 15th centuries). These documents came down to us through the subsequent centuries and are available in the Libraries of Portugal. The article is intended to make known variegated documents of religious controversies over three centuries, while, at the same time, we shall draft a brief presentation of their authors, except for anonymous works. In the second part, we shall proceed with a definition of this particlar literary genre as well as analyze the characteristics and also the common features of the different works. In the end, we shall investigaate the discourses, motivations, and the different authors who have influenced the writing of these medieval controversies.
Energy Trading Perspectives in the Digital Era
Authors: Puskás-Tompos András 
Published: August 2020

Abstract
The aim of the paper research is to identify and improve business models in energy trading by analyzing the current situation and developing scenarios for the evolution of business models in the Digital Era. It is very important to analyze, identify and track those directions that we believe will drive energy trading in order to be able to design and create new sustainable business models. We highlight the possibilities and ways of improving the energy trading, analyzing the rapid evolution of the field, generated by the emergence of several new factors that can influence this industry. Beside those directions at which electricity trading is heading in the Digital Era, the research also describes main innovations in the field such as Smart Grids, Blockchain Technology, Peer-to-peer trading platforms and Demand Response through which the purpose is to attract final consumers to the energy trading on web platforms or mobile applications with which they can properly control their electric appliances and self-generation units in their homes, all these supervised and guided by artificial intelligence. The type of research proposed to identify the current condition and to be able to develop new trading models is empirical research through qualitative analysis. Beyond incentives and monetary benefits, the focus is on final consumer education and increased awareness towards a more conscious, optimal and rational consumption of electricity that can lead to both a better use of the energy production from renewable sources and a reduction of pollutant fossil fuel electricity generation and carbon dioxide emissions without endangering the proper functioning of the electricity systems. Previous researches are based more on incentivizing or penalizing end consumers in present paper, more emphasis is placed on attracting the end consumer to his own electricity trading through mentioned innovation, but also supervised and guided by artificial intelligence.
Public policies in the First District of Bucharest - Sustainable solutions for increasing energy efficiency
Authors: Munteanu Răzvan-Aurelian 
Published: August 2020

Abstract
The paper represents an analysis of the public policies implemented in the First District of Bucharest related to the energy efficiency. Energy represents a strategic factor for the socio-economic development of Romania and finding the best solutions for increasing energy efficiency will contribute to the objectives for durability and competitiveness in the European Union. The importance of the theme is given by the requirement of the European Union through Energy Efficiency Directive that require member states to set up plans at every three years and evaluate the progress towards energy efficiency annually. Also, for the next period, 2021-2030, all member states must elaborate the 10-year integrated national energy and climate plan (NECP), presenting the solutions in order to meet the different targets for 2030, including energy efficiency. The objective of the article is to find the best solutions for increasing the energy efficiency, having as case study the 1-st District of Bucharest. The author is presenting three solutions, as follows: multistorey thermal rehabilitation, domestic elevators modernization, individual houses thermal rehabilitation. The impact of the solutions presented in the paper are the following: decrease of energy consumption, decrease of CO2 emissions, safety increase.
The valences of improving the quality of life in the new logic of leadership
Authors: Zavera Ioana Coralia 
Published: August 2020

Abstract
The literature regarding the new organizational philosophies has constantly enriched and has approached the challenges related to the desire to increase the organizational sustainability. On this thematic background, in which is increasing the role of the decision makers who move the organizations from the place they are to where they should be, the issues such as the attitude, the organizational behavior, the positioning of the firm actor at the level of the leadership architecture becomes the priority topics. In the context in which specialists have more and more arguments to claim that a new techno-industrial paradigm has been advanced (one specific to the fourth industrial revolution) one can even speak of drivers that boost analysts from the academic environment but also from business and institutional decision makers to quantify the impact that progress can have on cognitive skills, aptitudes and abilities. A leader must hold the organization and guide its employees in a turbulent and uncertain environment. For this, it is necessary for them to develop a comprehensive vision on how technology affects the quality of life of their employees and how to reshape the economic, social, cultural environments at the macro level. The present paper aims to highlight the main challenges of leadership in relation to the fourth industrial revolution, but also what are the transformations through which it is necessary to undergo it for a good correlation of human capital with technological progress and moreover with those indicators that fall under the umbrella of quality of life. The focus is on new skills, creativity, innovation, so that new business models can be developed and applied in a constantly changing environment.
Identifying and capitalizing new sources of competitive advantages is a vital prerequisite for corporate sustainability
Authors: Jianu Galav Roberta-Laura 
Published: August 2020

Abstract
On both the research agendas of the specialists in the academic field and those of the decision makers in the field of public policies, there are a series of topics of reflection among the most provocative which calls on researchers to identify solutions to new challenges. These include the prevalence of topics such as: threats to climate balance, deepening inequalities in welfare and prosperity, paradigm shifts in management and leadership, the emergence of on demand economy, just transition or the new scale of competitive advantages. At the microeconomic level, one of the most complex issues is that of business sustainability, which, under the conditions of the new global economic picture, must be equally efficient, economically, sustainable, socially, and resilient from an ecological point of view. Despite the most renowned experts analyzing the concept of competitive advantage, having highlighted the epistemological and praxiological foundations and clarified the variables on which its scope depends, the regional and global economic picture in dynamic change makes the analytical space continue. for this thematic area. This paper starts from the methodological assumption that the decision makers at the level of the companies must ensure the possible but synergistic combination between: the objective of maximizing the profit and the one of taking into account the plenary of maximizing the sales or of extending the relational capital. The main purpose of this paper is to study the deepest changes at the microeconomic level of the competitive advantage scale, the factors that influence these changes and propose a series of ways by which the companies that operate in Romania can be repositioned sustainably at the level of the most powerful regional supply chains.
Determination by the Settlement Systems of the Required Collateral Imposed to Participants
Authors: Baranga Laurentiu Paul , Zalinca Iulian 
Published: August 2020

Abstract
The dynamics of the increase in volume and amount of the financial or commercial transactions during the last decennials has amplified the role of clearing and settlement systems, along with the payment ones. From the quality of these systems as a financial markets stability provider also derives the concern for the management of financial risks mainly generated by the participants in these systems. The clearing-settlement systems, operated by infrastructure entities of the capital markets, ensure, within certain limits, a risk management for the incidents that could occur in the settlement activity regarding the financial transactions concluded between participants. We are going to present a methodology for determining the required collateral that must be maintained/updated by the debtor participants of a clearing-settlement system in order to ensure a robust management of the risks that could occur in the settlement operations. This methodology can be applied by any infrastructure entity of the capital market that manages collateral systems to limit the number of cases of settlement fails in financial transactions.