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Joanna Piepiórka-Stepuk

Abstract

The paper presents the results of analysis concerning the impact of temperature on sedimentation in the caustic soda solution that constitute a contamination after the process of cleaning utensils and pipes for hopped wort transport in the brewery. The solution was collected from the production plant after the process of cleaning and subjected to 12-hour sedimentation and changes of the solid particles participation, their size and percentage share in the solution was determined. The study was carried out with the Shadow Sizing method. The results were subjected to statistical analysis and the surface area of the response of the relation between the time and temperature of sedimentation and the number of particles which stay in the solution was calculated. The research results proved that the temperature significantly affects the cleaning degree of solutions by sedimentation and its duration. After sedimentation in solutions, particles with the surface area from 0.001-0.003 mm2 remain. Those particles are not subject to sedimentation and constitute a coloidal suspension in the solution.

Open access

Alexandros Koulis, George Kaimakamis and Christina Beneki

Abstract

This paper investigates the hedging effectiveness of the International Index Futures Markets using daily settlement prices for the period 4 January 2010 to 31 December 2015. Standard OLS regressions, Error Correction Model (ECM), as well as Autoregressive Distributed Lag (ARDL) cointegration model are employed to estimate corresponding hedge ratios that can be employed in risk management. The analyzed sample consists of daily closing market rates of the stock market indexes of the USA and the European futures contracts. The findings indicate that the time varying hedge ratios, if estimated through the ARDL model, are more efficient than the fixed hedge ratios in terms of minimizing the risk. Additionally, there is evidence that the comparative advantage of advanced econometric approaches compared to conventional models is enhanced further for capital markets within peripheral EU countries

Open access

Derling José Mendoza, Derling Isaac Mendoza and Enderson José Mendoza

Abstract

This study focuses on the importance of implementing guidelines to strengthen positive attitudes towards the study among students at Universidad Iberoamericana del Ecuador (UNIB.E). The teaching action-research was used to respond to the situation detected. Twenty-two students were the key informants. The information was also collected through the observation and survey process, which revealed technical difficulties in maintaining interest in the study. In this order of ideas, they are considered necessary the different processes framed in the planning and execution of diverse strategies that project the motivation towards the study. In the development of the different actions applied, it is carried out an evaluation to measure the achievements obtained in order to give greater objectivity and productivity in the fulfillment of the objectives proposed in the present study. Therefore, it is clear that the apathy of students for academic activities is due to the lack of appropriate strategies because these are not meaningful to them. That means, they do not awaken the motivation to generate the necessary interest to develop positive attitudes towards the study.

Open access

Asma Abdul Aziz, Mehmood Ul Hassan, Hisham Dzakiria and Qaisar Mahmood

Abstract

The study explores growing trends of using mobile in English language learning among higher secondary school learners in Pakistan. A survey is conducted to collect data from randomly selected students in district Okara (Punjab), Pakistan. Questionnaire based on five likert scale used to collect quantitative data. Analysis done on SPSS, to acquire mean score and frequency analysis reveals that higher secondary school students of English have great tendency for using mobile to learn English. Besides Students’ perception as obtained from survey prove that using mobile for English language learning makes their job easy and they are able to develop their listening and communicative habits. Findings of this study also reveal that using mobile for English language learning makes the students, independent and self-evaluator.

Open access

Kranravee Komoldit, Malai Tawisook and Nataya Pilanthananond

Abstract

With modern society impacted by globalization, declining birth rates and technological advancement, higher education institutions struggle to produce graduates ready to enter the workforce in adequate quality and number in an increasingly competitive atmosphere. In countries such as Thailand, outdated instruction and social inequalities add further complication. This study aims to examine the management characteristics of such institutions that will effectively promote graduate production and competitiveness in the digital era. Data was collected using Ethnographic Delphi Future Research, with interviews and questionnaires conducted with specialists in the fields of education and management. Results from information gathered and analyzed underline the necessity for supplementing graduate education with information systems technology and digital resources and aligning curricula and practices to meet the demands of industries in need of future manpower. The research identified mechanisms and policies with which higher education management can encourage new knowledge creation through research and provide accessible and convenient avenues for learning to enhance institutional competitiveness and help shape improved, intelligent, better qualified and more marketable human resources for future generations.

Open access

Polona Pavlovčič

Abstract

Background: Determining the location, boundaries and areas of land properties accurately in the land cadastre is essential. The named data are provided using coordinates, acquired from field measurements. Since 2008, the Slovenian land cadastre claims positioning in the national realization of the ETRS89, so the GNSS use is practically indispensable. Objectives: Contrary to real-time, we can change parameters in GNSS post-processing. The aim of this paper is to simulate different measurement conditions for GNSS in order to determine how to acquire the best possible coordinates for further use in land area calculation. Methods/Approach: Simulations of obstacles near points followed the increasing of the cut-off angle. Furthermore, shortening the observation interval resulted in different occupation duration. The final condition evaluation for coordinate quality acquisition followed from fuzzy logic. Results: The results show that for short baselines, occupation duration is the most important factor in acquiring high quality coordinates and avoiding the multipath. Differences in coordinates from specific strategies can sometimes exceed the tolerance and evidently affect the area calculation. Conclusions: The findings confirm that only good measurement conditions lead to high quality coordinates and well-defined areas of land properties, which are the fundamental factor in relation to the issues of property valuation and assessing land taxes or rents

Open access

Lida Issazadeh, Mustafa Ismail Umar, Said I.A. Al-Sulaivany and Jian Hassanpour

Summary

Estimating soil hydraulic properties are so important for hydrological modeling, designing irrigation-drainage systems and soil transmission of soluble salts and pollutants, although measurements of such parameters have been found costly and time-consuming. Owing to a high spatial variability of soil hydraulic characteristics, a large number of soil samples are required for proper analysis. Nowadays, geostatistical methods are used to estimate soil parameters on the basis of limited data. The purpose of this research is to investigate the spatial variability of the permeability coefficient in different soil textures (26 soil samples) found in the Kurdistan region of Iraq. The parameter values obtained indicated a normal trend in particle size distribution, whereas the values of permeability coefficient showed aberrant distribution patterns. Geostatistical analysis results indicated the best fitted theoretical model was Gaussian model and the proportion of sill/(sill + nugget) was 0.17 indicated strong spatial dependency of soil permeability. Furthermore, the optimal distance for estimating the soil permeability coefficient was 109,119 meters. A comparison of the kriging and IDW interpolation methods showed that both methods can estimate soil permeability with high accuracy and less error. The prediction maps of the applied methods indicated that high soil permeability rates were recorded in the south-east of the Kurdistan region of Iraq compared to low soil permeability rates recorded in the remainder of this region. It is recommended other interpolation methods such as co-kriging and indicator or simple kriging methods could be used to simulate data in large scale areas as well.

Open access

John Karkazis and Georgios C. Baltos

Abstract

In this paper the concept of the “Geo-Economic Gravity System” will be discussed as a methodological tool in regard with the key issue of “regional efficiency”, as well as a modeling tool in the effort to face relevant socio-economic problems. As a case study, the fierce opposition between oriental and westernoriented political powers, other words neo-ottomans versus kemalists in the Turkish society, is being respectively examined. The Geo-economic Gravity Systems explain the socio-economic rifts, heading back to the 90’s and demonstrating the multiple and prevailing societal polarization. On its second part, however, this study exhibits that, in the aftermath of the R.T. Erdogan’s governments, despite that the political dichotomy lines remain, at least the severe economic disparities have been smoothed due to policies, incentives and infrastructure investments accomplished. The analysis of Turkey’s internal geoeconomic trends offers notable insight into the mechanism controlling in general the regional socioeconomic attractiveness and efficiency. Consequently, such an analysis can remarkably contribute in the research of the spatial dimension as a catalyst for emerging development opportunities in any country.

Open access

Mostafa Mamdouh Elshenawy, Galal Bakr Anis, Walid Hassan Elgamal and Ebrahim Abd-Elsalam Ramadan

Summary

Line × Tester experiment was carried out at the Experimental Farm of Rice Research and Training Center (RRTC), Sakha, Kafrelsheikh, Egypt during three growing seasons to evaluate the performance of 21 F1 hybrids along with their parents. Three cytoplasmic male sterile lines, two wild abortive (Wild Abortive); IR69625A, IR70368A and one (Kalinga) K17A as female were tested with seven cultivars/lines as testers. The analysis of variance detected that, highly significant variations among genotypes (parental lines with their crosses) for all traits in both seasons and in their combined analysis. Two hybrid combinations; IR69625A×Giza178 and IR69625A×Giza179 were recorded the best values for grain yield under both seasons and their combined. General combining ability (GCA) and specific combining ability (SCA) effects of genotypes for the studied traits were estimated. The results indicated that, K17A (female) and Giza 179 (male) were the best combiner for early heading date and could be useful to breed early maturing rice cultivars. The CMS line IR69625A and Giza178, Giza179 gave highly significant and positive GCA value and so appeared to be good parental lines combiner in hybrid combinations for high grain yield/plant. The positive values of GCA mean increased for grain yield/plant, which could be useful in breeding programs for high yield potential rice cultivars. The hybrid combination IR69625A×Giza179 showed highly significant and positive SCA estimates under both seasons and their combined. In conclusion, it is clear that this hybrid seemed promising hybrid for earliness and high grain yield under Egyptian conditions.

Open access

Emanuele Munarini

Abstract

In 1997, Richard André-Jeannin obtained a symmetric identity involving the reciprocal of the Horadam numbers Wn, defined by a three-term recurrence Wn +2 = P Wn +1 − QWn with constant coefficients. In this paper, we extend this identity to sequences {an}n ∈ℕ satisfying a three-term recurrence an +2 = pn +1 an +1 + qn +1 an with arbitrary coefficients. Then, we specialize such an identity to several q-polynomials of combinatorial interest, such as the q-Fibonacci, q-Lucas, q-Pell, q-Jacobsthal, q-Chebyshev and q-Morgan-Voyce polynomials.