Miracle-dz/UniFAR-FTUs huggingface dataset:
Synthesis and tribological properties of graphene: A review

The target of this review is to explore the fundamental tribological behaviour of graphene, the first existing two-dimensional (2-D) material and evaluate its performance as a self-lubricating material. The importance and potential impact of this new class of material was recognised by the whole scientific community when the Noble prize was awarded to Geim and Konstantin Novoselov for their discovery and development of graphene in 2010. Graphene is the strongest material, chemically and thermally stable, gas-impermeable, and atomically-thin. The fundamental tribological behaviour of graphene and other 2-D materials under sliding conditions is recently being studied. Mainly, the wear of graphene has hardly been investigated. In this paper, the latest developments in tribological applications of graphene, and preparation methods are reviewed. It is shown that various graphene coatings, graphene as lubricant additive and as reinforcement in metal matrix can be successfully employed to decrease friction and wear in tribological applications. A comprehensive review is provided with the aim to analyse such properties of graphene. Moreover, the application of graphene in the field of tribology for reducing friction and wear for better lubrication will be explored.
HIP-2015-31 / TH INT-PUB-15-048 Conformal quantum mechanics and holographic quench

Recently, there has been much interest in holographic computations of two-point nonequilibrium Green functions from AdS-Vaidya backgrounds. In the strongly coupled quantum field theory on the boundary, the dual interpretation of the background is an equilibration process called a holographic quench. The two dimensional AdS-Vaidya spacetime is a special case, dual to conformal quantum mechanics. We study how the quench is incorporated into a Hamiltonian H + θ(t)∆H and into correlation functions. With the help of recent work on correlation functions in conformal quantum mechanics, we first rederive the known two point functions, and then compute non-equilibrium 3and 4-point functions. We also compute the 3-point function Witten diagram in the two-dimensional AdS-Vaidya background, and find agreement with the conformal quantum mechanics result. ∗jarkko.jarvela@helsinki.fi †vkeranen1@gmail.com ‡esko.keski-vakkuri@helsinki.fi 1 ar X iv :1 50 9. 01 09 2v 2 [ he pth ] 1 8 Fe b 20 16
TUTWPE No 152 Entrepreneurship Education and Finnish Society

The discussion between entrepreneurship and education strengthened towards the end of the 20 century due to the increasing impact of small businesses on societies. It is therefore reasonable to assume that present-day students may soon experience the small business context in some form as their future work environment. The supply of entrepreneurship courses is, in fact, one of the fastest growing themes in university teaching in both sides of the Atlantic. The Finnish government has also taken this fact as one of the key issues in its policy programme and committed to entrepreneurship education throughout its school system. The dilemma will be faced however when it comes to the current contribution of the education to the educational theories. The discussion of how to learn entrepreneurship and develop pedagogy for it has only taken very preliminary steps. So far the focus has changed from the trait theories of biological heritage, i.e. assuming that we are born to be entrepreneurs, towards the belief that we learn to be entrepreneurs and we learn how to behave like entrepreneurs. This education-oriented focus has, however, generated studies in entrepreneurship research rather than attracted education researchers. This article suggests that the lack of this contribution appears as an apparent shortage of pedagogical discussion. In order to encourage this debate as an interplay between these two sciences, this paper delineates some elements of entrepreneurial pedagogy, compares them to the available learning paradigms and thus gives some ideas for further enhancing entrepreneurial learning in different levels of school system. JEL Classification Numbers: A2, R5
Modelling of noise-like pulses generated in fibre lasers

The present paper for the first time proposes and studies a relatively simple model of noise-like pulses that matches the experimental data well and suggests that there is a correlation between phases of adjacent spectral components of noiselike pulses. Comparison of a relatively basic model of ‘random’ pulses with the results of noise-like pulse modelling in mode-locked fibre lasers based on coupled non-linear Schrödinger equations demonstrates that it adequately reproduces temporal and spectral properties of noise-like pulses as well as correlation between adjacent modes so that it’s possible to use the proposed model for highly efficient simulations of promising applications of noise-like pulses, such as material processing, non-linear frequency conversion, microscopy, and others.
ANALYSIS FOR FREE VIBRATION OF LAMINATED COMPOSITE & SANDWICH PLATES WITH THE HELP OF EULER-LAGRANGE EQUATION BASED ON FIRST ORDER SHEAR DEFORMATION THEORY, FORMULATIONS AND SOLUTION TO THE NATURAL FREQUENCY & COMPARE TO OBTAINED RESULTS

This paper present the analytical solution for free vibration of Laminated composite and sandwich plates with the help of Euler-Lagrange Equation based on first order shear deformation theory to analytical formulations and solution to the natural frequency, analysis of simply supported composite and sandwich plates on compared to obtained results, nondimensionalized fundamental frequencies. Theoretical model presented herein incorporates laminate deformations which accounts for the effect of transverse shear deformation, transverse normal strain/stress and none-linear variation of In-plane displacement with respect to the thickness coordinate-thus modeling warping of transverse cross-section more accurately and eliminating the need for shear correction coefficients. Inthis present article the result is compared from obtained result of previous literature.
A COLLABORATIVE SIMULATION FOR ACTIVE FLOW-INDUCED VIBRATION CONTROL OF A CIRCULAR CYLINDER

In this paper a collaborative simulation between Matlab/Simulink and Fluent softwares is done to active control of an elastically mounted circular cylinder, free to move in in-line and cross-flow directions. The control goal is reduction of the two-dimensional vortex-induced vibrations (VIV) of cylinder. The natural oscillator frequency is complemented with the vortex shedding frequency of a stationary cylinder. A parallel simulation scheme is realized by linking the PID controller employed in Matlab/Simulink to the plant model constructed in Fluent, aiming at calculation of the control force necessary for total annihilation of the transverse cylinder vibrations. The simulation results reveal the high performance and effectiveness of the adopted control algorithm in diminishing the VIV of elastic cylinder. Once the control algorithm is turned on, there is a extreme reduction in the transverse and in-line cylinder oscillation amplitudes as well as lift and drag coefficients values. In particular, it is observed that the coalesced vortices in the far wake region of the uncontrolled cylinder are seprated and displaying wake vortices of weaker strengths.
Efficiency of removing organic pollutants from wastewater in a household wastewater treatment plant with a hybrid reactor

The purpose of the study is to evaluate the efficiency of removing organic pollutants from wastewater in a household wastewater treatment plant with a hybrid reactor. The efficiency of the plant was analysed in terms of decreasing BOD5, COD and the content of total suspended solids in differentiated technological conditions. The variable parameter was the length of the reactor aeration phase and the dwell phase. Six different aeration variants were analysed. The efficiency of a wastewater treatment plant with a hybrid reactor in terms of reducing BOD5 oscillated from 81 to 90%, COD – 64–84%, whereas total suspended solids – 66–89% which, as a rule, was not sufficient to achieve standard levels. The best results were achieved for the following variants: 2h aeration – 2h dwell and 1h aeration – 0.5h dwell. Lower efficiency of the plant could have been attributed to operational problems, mainly failures of the plant control system and uneven conditions such as air temperature, volume and composition of wastewater received in the plant.
Designing Unimodular Waveform with Low Range Sidelobes and Stopband for Cognitive Radar via Relaxed Alternating Projection

Cognitive radar could adapt the spectrum of waveforms in response to information regarding the changing environment, so as to avoid narrowband interference or electronic jamming. Besides stopband constraints, low range sidelobes and unimodular property are also desired. In this paper, we propose a Spectral Approximation Relaxed Alternating Projection (SARAP) method, to synthesize unimodular waveform with low range sidelobes and spectral power suppressed. This novel method, based on phase retrieval and relaxed alternating projection, could convert the correlation optimization into the spectrum approximation via the Fast Fourier Transform (FFT). Moreover, by virtue of the relaxation factor and accelerated factor, SARAP can exploit local area and more likely converge to the global solution. Numerical trials have demonstrated that SARAP could achieve excellent performance and computational efficiency which will facilitate the real-time design.
Twitter Data Preprocessing for Spam Detection

Detecting Twitter spammer accounts using various classification machines learning algorithms was explored from an aspect of data preprocessing techniques. Data normalization, discretization and transformation were methods used for preprocessing in our study. Additionally, attribute reduction was performed by computing correlation coefficients among attributes and by other attribute selection methods to obtain high classification rates with classifiers,such as Support Vector Machine, Neural Networks, J4.8, and Random Forests. When top 24 attributes were selected and used for these classifiers, the overall classification rates obtained were very close in range 84.30% and 89%. There was no unique subset of attributes which performed the best, and there were various different sets of attributes playing
Molecular Phylogeny of four bivalve species collected from Egyptian Mediterranean and Red Sea based on mitochondrial CO1 gene sequences

The marine bivalve (family Veneridae and Mytilidae) are dominant groups in terms of species numbers, diversity of habitat and economical importance. The aim of the current study is to gain new insights onto the phylogeny of four different species of bivalvein Egypt. Partial sequence of the mitochondrialcytochrome oxidase subunit 1 (CO1) is sequenced to assess whether different species of bivalve could be distinguished by DNA barcoding technique. The obtained molecular results revealed the efficacy of DNA barcoding in species identification and differentiation between the different species.
Changes in Anti-Oxidant Enzyme Profile during Haematological Malignancy

Abstract Reactive oxygen species can initiate lipid peroxidation and DNA damage leading to mutagenesis, carcinogenesis and cell death, if the antioxidant system is impaired. The present work aimed to study the changes in the quantitative in vitro activities of the antioxidant enzymes – glutathione peroxidase and superoxide dismutase in the whole blood of our study group. Our study group included both blood cancer patients and age, sex matched healthy controls. We found significant decreases in the activities of both glutathione peroxidase and superoxide dismutase in patients as compared with healthy controls. Our previous work has indicated elevated arsenic concentration in the biosamples of patients. Thus, haematological malignancy is found to be associated with changes in the antioxidant defense system which is correlated with arsenic toxicity.
Training, exhaustion, and commitment of temporary agency workers: A test of employability perceptions

The aim of this study was to analyse whether the social exchange between temporary agency workers (TAWs) and the client organization is associated with a perception of training. In this study, we developed and tested a moderated mediation model that accounts for TAWs’ exhaustion and desire to obtain a direct contract with the client company in the relationship between the perception of training and affective commitment. Our hypotheses were tested on a sample of 425 blue-collar workers from four Portuguese companies with temporary agency work contracts. Our findings support a conditional indirect relationship between the perception of TAWs that the training provided by the client company facilitates their internal employability and their commitment towards this company via exhaustion for those TAWs who have a low desire to have a direct contract with this company. In addition, our findings show that TAWs do not reciprocally respond to the training that promotes external employability, as this factor is not associated with the affective commitment of these individuals, although exhaustion is associated with this perception. Moreover, we discuss the implications of these findings for the human resource management of TAWs.
VIBRATION FREQUENCY OF PRESTRESS SLENDER BEAMS RESTING ON WINKLER ELASTIC FOUNDATION

The present paper investigates the vibration frequency of slender beams prestressing by axial force and resting on an elastic Winkler foundation by the finite element method. A beam element taking the effects of both the prestress and foundation support into account is formulated using the expression of strain energy. Using the developed element, the natural frequencies of beams having various boundary conditions are computed for different values of the axial force and foundation stiffness. The influence of the axial force and the foundation stiffness on the frequency of the beams is investigated . The effect of partial support by the foundation and the type of mass matrices on the vibration frequency of the beam is also studied and highlighted.
ASYMMETRIC INFORMATION IN CREDIT MARKETS AND ITS IMPLICATIONS FOR MACRO-ECONOMICS

In this paper we investigate the macroeconomic equilibria of an economy in which credit contracts have both the adverse selection and incentive effects. The terms of credit contracts include both an interest rate and a collateral requirement. We show that in this richer model all types of borrowers may be rationed. Whether or not the economy is in a rationing regime, interest rates charged borrowers may move either pro- or counter-cyclically. If pro-cyclical shocks have a greater effect on the success probabilities of risky techniques than on safe ones, then the interest rate offered depositors may also move counter-cyclically. Increases in the supply of loanable assets can increase or decrease the average interest rate charged borrowers. Finally, we show that the impact of monetary policy on the macroeconomic equilibrium is affected by whether or not the economy is in a regime in which credit is rationed. Copyright 1992 by Royal Economic Society.
Productivity, Export Performance, and Financing of the Czech Corporate Sector: The Effects of Foreign Direct Investment

The article looks in both theoretical and empirical terms at whether large foreign presence has affected domestic firms. Foreign firms might both intentionally and unintentionally influence the productivity, financing, and export performance of local firms within the same industry or across industries along the production chain via supplier and client linkages. Economic theory does not suggest an unambiguous answer to the question of whether the influence is positive or negative. To answer this question, both firm-level and industry-level data on performance, financing, and exports and interactions of firms within the production chain in the Czech Republic are analyzed.
Influence of rock-pool characteristics on the distribution and abundance of inter-tidal fishes

Rock pools can be found in inter-tidal marine environments worldwide; however, there have been few studies exploring what drives their, fish species composition, especially in Australia. The rock-pool environment is highly dynamic and offers a unique natural laboratory to study the habitat choices, physiological limitations and adaptations of inter-tidal fish species. In this study rock pools of the Sydney region were sampled to determine how the physical (volume, depth, rock cover and vertical position) and biological (algal cover and predator presence) parameters of pools influence fish distribution and abundance. A total of 27 fish species representing 14 families was observed in tide pools at the four study locations. The five most abundant species were Bathygobius cocosensis, Centropogon australis, Enneapterygius atrogulare, Lepidoblennius haplodactylus and Microcanthus strigatus, which together represented 71% of the total number of fish recorded. Larger rock pools containing more algal and rock ledge cover hosted a larger and more diverse population of fish. Furthermore, certain species were only found in pools with specific characteristics, such as the presence of loose shells, a variety algae or rock cover, suggesting a high degree of habitat specificity. By contrast, some species were ubiquitous and thus can likely tolerate a wide variety of physical conditions.
The probable causes for the espoused inadequacies in science student teachers’ practice teaching in schools at the National University of Lesotho

The observed and reported pervasive inadequacy with both pre-service and in-service teachers in classroom teaching still abounds despite the various efforts made in many countries to improve teacher education and teacher preparation programs. This study has been conducted in Lesotho, a small mountainous landlocked country in the Republic of South Africa with a population of about 2 million. In Lesotho there are currently only two teacher training institutions, the National University of Lesotho and the Lesotho College of Education. The purpose of this study was to explore where the shortfall might lie in the pre-service teacher training that led to science student teachers’ reported inadequacies in classroom teaching. The data were collected through the semi-structured interviews of the directly involved people comprising 20 student teachers 20 teaching practice tutors, 2 teacher educators and 2 regular practicing teachers. The Data from the interviews were complemented with the analysis of the documents using template analysis strategy and constant comparison method. The main findings of the study revealed that the courses and the procedures for teacher preparation embraced the development of the pre-service teachers’ professional knowledge and qualities. However, the major constraints for attainment of the aspired teacher product were time and procedures. It was hoped that the context in which it was conducted would inform and influence policy and practice in education at various levels, extending into the general field of research.
Is the Physical World the Math/Platonic-World Only?

Mathematical states of the infinite cosmos should be preferred as the initial conditions. Creation of physical world is impossible without two different ground states. In the limit we obtain grainy mathematical spacetime with grains composed of infinite sets of finite velocities of sizeless points placed in (true) nothingness. Such model is coherent for nontransparent grains. Can the mathematical grains be nontransparent? Probability that we cannot formulate coherent mathematical theory of Nature without plenums moving in nothingness is very high. Existence of the plenums causes that in the limit we do not lose information about inertial mass. Next, due to the inertial mass directly proportional to volume of the grains of velocities, we can replace densities by dimensionless numbers i.e. there is possible the transition from the dynamical quantities to kinematical ones. Can be the infinite physical cosmos built from mathematical objects only? What is the transition from math to physics? What are the moving pieces of space? What is the origin of their inertia? What is the origin of the critical/Planck values? Is there a lower limit for the General Relativity and Quantum Physics? Do we need new physics?
Fairway Navigation - Observing Safety-Related Performance in a Bridge Simulator

ABSTRACT: This paper proposes an approach of measuring navigation performance using a full mission bridge simu-lator. The motivation for this research is the updates in equipment and that the desire of using new instruments and technology not always is accompanied by analyses of the impact of the changes. The task of navigating in a fairway is proposed to be assessed through various methods to answer questions related to performance and the experience of using bridge equipment. The overall aim is to reach a higher degree of understanding and knowledge through the test-ing of different instrumentation setups.
The determinants of markups on export markets: A firm-product-market analysis ∗

In this paper, we extend the production function estimation to a multi-product setting to generate firm-product level estimates of productivity and markups. We use detailed information about domestic production and international trade transactions for a large sample of Belgian firms over a long period of time (1995-2009). We then move our framework to an international trade context and investigate why export prices vary by destination for the same firms and how it affects our understanding of what productivity and markups mean for a multi-product firm involved on multiple markets. We find sensible estimates for our output elasticities and markups, and substantial evidence of pricing to market, as firms charge higher prices on more distant and richer markets.
Master Degree Project in International Business and Trade Master Degree Project in Innovation and Industrial Management

Ideas are the basis of what can lead to innovation, where the latter is crucial to obtain and sustain competitive advantage. MNCs have the possibility to internally connect globally diverse knowledge to create ideas through organisation-wide collaboration. However, MNCs experience difficulties with sharing ideas internally. IT platforms have been presented as a solution, but have received limited attention in previous research, therefore this study explores the interdisciplinary gap of the two fields, MNCs knowledge sharing and IT platforms. This qualitative study aims to increase the understanding of how IT platforms can be used for sharing ideas in the daily operations within an MNC, where the platforms are available to all employees. The findings show that IT platforms can be used as wikis, suggestion boxes, social media platforms and Q&As for sharing ideas in the daily operations. This study identifies the use of the IT platforms and the elements that affect the use, without providing best practice recommendations. However, the use of these platforms in MNCs is impacted by elements related to knowledge sharing barriers for MNCs as well as the support mechanisms needed for IT platforms. Finally, the result of this study implies that MNCs can use the four explored IT platforms for sharing ideas in a variety of ways, e.g. from creating discussions for ideas, to having standardised forms for idea sharing.