bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Role of the Universities in Shaping the Entrepreneurial Ecosystem. A Qualitative Approach
Authors: Lina Diana Manuela 
Published: January 2019

Abstract
Studies addressing the concept of entrepreneurial ecosystem generally focus on identifying its constituent elements and less on the interaction between them. To fill this gap, the study’s objective is to explore the interaction between the university and the other components of the entrepreneurial ecosystem, from a semantic perspective. Using the method of qualitative analysis, respectively the semantic analysis method, the study analyses the role of universities from the North East region of Romania in creating the regional entrepreneurial ecosystem through the influence of regional development strategies. The tools used to achieve the proposed objective were bibliometric analysis and the Tropes software. The obtained results reflect the increased interest of the researchers towards the university and its role in the entrepreneurial development of the communities. On the other hand, regional policy documents do not reflect (at least at semantic level) the role that universities have in creating the regional entrepreneurial ecosystem.
Can Marketing Communication Prime You to Act ‘Green’?
Authors: Chwialkowska Agnieszka 
Published: January 2019

Abstract
As popularity of eco-friendly products has increased over the past decade, brands utilize green advertising and position their products as green to appeal to the taste of environmentally conscious customers. Even though many customers are concerned about the state of environment, they are discouraged from purchasing eco-friendly products and engaging in other sustainable behaviors due to economic and social barriers. This research poses a question how marketing communication can capitalize on environmental concern to promote desired green behaviors by priming customers to think about their proenvironmental values and motivations to act green. To answer this question, we analyze over 1500 customer responses to marketing communications on social media. In this content analysis study we utilize logistic regression to discover which primers are the most effective at activating green behaviors. This research provides managerial implications helping marketing communicators employ effective primers that will generate desired customer behaviors.
Genetic variability in Acidithiobacillus spp. – a working horse of environmental biotechnologies
Authors: Pristas Peter , Kiskova Jana , Timkova Ivana , Malinicova Lenka , Luptakova Alena , Kusnierova Maria , Sedlakova-Kadukova Jana 
Published: January 2019

AbstractThe genus Acidithiobacillus comprises 7 species of Gram-negative obligatory acidophilic chemolithotrophic bacteria that derive energy mainly from the oxidation of reduced sulphur compounds. Four of the species also catalyse the dissimilatory oxidation of ferrous iron while three (A. thiooxidans, A. albertensis, and A. caldus) do not. Bacteria from the genus Acidithiobacillus are often associated with mineral biotechnologies (biomining) and acid mine drainage. While acceleration of mineral solubilisation is a positive aspect in environmental biotechnologies, it is undesirable in acid mine drainage with strong negative ecological impact and there is profound interest in genetics and genomics of these bacteria. Representatives of Acidithiobacillus genus occur world-wide, however there are limited data on Acidithiobacillus spp. variability from Slovakia. In our work the variability of Acidithiobacillus spp., from Slovakia was analysed and the presence of A ferrooxidans was detected. In addition, for the first time we report here on the occurrence of A. albertensis as well. Comparative analyses confirmed pronounced genetic and genomic diversity within the genus, especially within A. ferrooxidans and A. thioxidans complexes. Based on data presented, several Acidithiobacillus species could be considered as a complex species and the description of several new species is very probable in the near future.
Determination of selected phenolic acid and majoritarian avenanthramides in different varieties of naked oats (Avena sativa L.) grown in Slovakia
Authors: Kulichová Katarína , Maliarová Mária , Sokol Jozef , Lašáková Katarína , Havrlentová Michaela 
Published: January 2019

Abstract
Oats are important cereals. Oats are a good source of protein and lipids, polyphenolics, phenolic acids, flavonoids and avenanthramides. Avenanthramides is phenolic group, which is unique in oats and have antioxidant activity, anti-inflammatory, anti-atherogenic and anti-proliferative effect. The aim of study is determination of the majoritarian avenanthramides (2c, 2p and 2f) and phenolic acids (p-coumaric and ferulic) in selected varieties of oat (Avena sativa L.) grown in two consecutive years using the HPLC method. The oats were exposed to ultrasound supported extraction (two 15 min cycles).The simultaneous separation was performed using C18 type of stationary phase. The method showed a good linearity in the concentration range 0.04 - 5.24 μg/mL for p-coumaric acid, 0.04 - 5.13 μg/mL for ferulic acid, 0.19 - 24.5 μg/mL for avenanthramide 2c, 0.53 - 17.1 μg/mL for avenanthramide 2p, 0.8 - 25.6 μg/mL for avenanthramide 2f. Correlation coefficients were higher than 0.9997. Detector operated at a wavelength 320 nm. The repeatability of the method was evaluated in three concentration levels with satisfactory results for each analyte. The content of both phenolic acids is significantly lower (50- - 100-times) compared to the total content of avenanthramides in both years’ harvests for all analyzed varieties. Content of total avenanthramides was the highest in varieties Racoon (723.28 mg/kg) followed by Oliver (578.59 mg/kg) and Kamil (384.17 mg/kg).
Bioanalytical HPLC method development for simultaneous determination of valsartan and co-administered clopidogrel bisulfate and fenofibrate in stroke prevention in raw materials, spiked human plasma and tablets
Authors: Ragab Gamal H. , Bahgat Eman A. 
Published: January 2019

Abstract
This study reports about simple, robust and reproducible method for simultaneous bioanalytical determination of Valsartan (VAL) and co-administered Clopidogrel bisulfate (CGB) and Fenofibrate (FEN) in raw materials, spiked human plasma and tablets using isocratic RP-HPLC method. The chromatographic separation is carried out using isocratic binary mobile phase consisting of 80 mM phosphate buffer pH 3: Acetonitrile (30: 70 %; v/v) at the flow rate of 1.1 mL/min and 33 °C. A Diode array detector at wavelength 214 nm was used. Retention times for VAL, CGB and FEN were 3.1, 5.1 and 6.4 min, respectively. The calibration curves obtained were linear over the concentration ranges of 2.5 - 100 μg/mL for both VAL and CGB and 5 -100 μg/mL for FEN. The mean extraction recoveries of VAL, CGB and FEN from spiked plasma were 75.38±1.34 %, 89.91±2.17 % and 96.92±6.02 %, respectively. The limits of detection and quantification were 0.86, 0.67, 1.11 μg/mL and 2.60, 2.03, 3.36 μg/mL for VAL, CGB and FEN, respectively. The method was applied to the analysis of these drugs in spiked human plasma and in tablets as they are commonly used as a combination for prevention of stroke. Results obtained show good accuracy, precision and acceptable recoveries from plasma samples.
Treatment of produced water by induced air flotation: effect of both TWEEN 80 and ethanol concentrations on the recovery of PAHs
Authors: Chebbi Salima , Allouche Atmane , Schwarz Marian , Rabhi Souhila , Belkacemi Hayet , Merabet Djoudi 
Published: January 2019

Abstract
The present study investigates the application of induced air flotation (IAF) technique on PAHs (PAHs) removal performance from a real oilfield produced water of a separator cell. The quantification of total PAHs (PAHtot) was done using ultraviolet-visible spectrometry (UV-Vis) according to the naphthalene calibration curve. The UV-Vis spectra of naphthalene dissolved in a mixture of the binary solvent (water-ethanol) and the Tween 80 showed stability in the molecular orbital of C10H8. The use of small concentration of Tween 80 was revealed to be discrete in the quantification of PAHtot. The flotation process was improved at the critical micelle concentration of Tween 80 (CMC) of 2 % and the critical coalescence concentration of ethanol (CCC) of 0.5 mL/L for the PAHtot recovery of 49.76 % and the PAHtot content in the pulp of 50.24 %. At these concentrations, half of PAHtot was removed from produced water PW. Above the CMC and the CCC, the PAHtot recovery decreased and the PAHtot content in the pulp increased. It was found that there is a collector concentration at which the amount of water carrying from the pulp to the concentrate was increased and in parallel, the PAHtot recovery increased and the PAHtot content in the pulp decreased. Both of the CMC and the CCC have promoted the decrease on the conditioning time from 30 to 10 min and the flotation time from 20 to 6 min. Since the impeller speed and air flow rate were constant, the flotation of PAHs was limited. The flotation kinetics of PAHtot was described by the Higuchi model.
Synthesis and structure-physicochemical properties relationship of thiophene-substituted bis(5,4-d)thiazoles
Authors: Tokárová Zita , Biathová Anna 
Published: January 2019

Abstract
Substituted thiophene-2-carbaldehydes 1a-dwere utilized in the synthesis of symmetrically substituted thiazolo[5,4-d]thiazoles 3a-d. Bis(5,4-d)thiazoles with thiophene core at the termini are the most employed in the chemistry of materials but exhibit insufficient solubility in majority of organic solvents with notable impact on the low yields of products. Accordingly, the synthetic approach towards 2,5-dithiophen- 2-yl-thiazolo[5,4-d]thiazole (3a) and its substituted derivatives 3b-d is discussed under the various reaction conditions. Appropriate structural characterisations are included with emphasis on relationship between structure and physicochemical properties highlighting the UV-Vis and fluorescence.
Studies on hydrometallurgical processes using nuclear techniques to be applied in copper industry. II. Application of radiotracers in copper leaching from flotation tailings
Authors: Rogowski Marcin , Smoliński Tomasz , Pyszynska Marta , Brykała Marcin , Chmielewski Andrzej G. 
Published: January 2019

Abstract
The use of radiotracers in the present study is intended to replace traditional steps of metal quantitative analysis (solution sampling and instrumental chemical analysis) and to allow real-time measurements of metal concentrations during the leaching process. In this study, 64Cu, an isotope of copper, was selected as a radiotracer. Samples of copper flotation tailings were irradiated in the Maria research reactor (Świerk, Poland) and mixed with an inactive portion of the milled fl otation waste. The leaching process was carried out in a glass reactor, and the radiation spectrum was measured using a gamma spectrometer. The material was then treated using various acids (sulphuric acid, nitric acid, acetic acid, citric acid, and ascorbic acid) in a wide range of their concentrations. Experiments with the radiotracer were conducted in sulphuric and nitric acids. The amount of the leached metal (copper) was calculated on the basis of the peak area ratio in the gamma-ray spectrum of the activated tailings and standard samples. Inductively coupled plasma mass spectrometry (ICP-MS) was also used to analyse the metal content. Maximum recovery of 56% Cu was achieved using 9 M HNO3, whereas the recovery was lowest for ascorbic acid (<1%). Both analytical methods were compared, and the results presented in this paper are in good agreement with radiometric measurements obtained using ICP-MS analysis.
Dynamically Positioned Ship Steering Making Use of Backstepping Method and Artificial Neural Networks
Authors: Witkowska Anna , Rynkiewicz Tacjana Niksa 
Published: January 2019

Abstract
The article discusses the issue of designing a dynamic ship positioning system making use of the adaptive vectorial backstepping method and RBF type artificial neural networks. In the article, the backstepping controller is used to determine control laws and neural network weight adaptation laws. The artificial neural network is applied at each time instant to approximate nonlinear functions containing parametric uncertainties. The proposed control system does not require precise knowledge of the model of ship dynamics and external disturbances, it also eliminates the problem of analytical determination of the regression matrix when designing the control law with the aid of the adaptive backstepping procedure.
Mapping Marine Traffic Density by Using AIS Data: An Application in the Northern Aegean Sea
Authors: Kundakçi Burak , Nas Selçuk 
Published: January 2019

Abstract
Automatic Identification System (AIS) data is used for monitoring the movements of vessels live movements through instant transmission of vessel information while, at the same time, historical AIS data is used for marine traffic analysis by researchers. There are several methods and computer programs developed for the analysis of marine traffic by the use of AIS data. Combining the intersection algorithm proposed by Antonio (1992) and distance calculation method, this study develops a method to analyse vessel distribution on a selected cross sectional line (SCS) in the Northern Aegean Sea. As a complementary to the new methods proposed, a desktop application is developed in C# programming language to visualize the vessel distribution on the SCS line. SQL server is used for AIS data storage and analysis. The study is conducted over 7-day AIS data, specifically 2.382.469 rows and 42.884.442 data in total, belonging to the Northern Aegean Sea marine traffic. As a result, the mapping of the movements of different types of vessels in the Northern Aegean Sea is effectively performed and Frequency-Distance, Draught-Distance, SOG-Distance, SOG-COG distributions on the SCS line are successfully analysed by the new method introduced.
Simple Computational Methods in Predicting Limit Load of High-Strength Cold-Formed Sections due to Local Buckling: A Case Study
Authors: Bielski Paweł , Samson Leszek , Wysocki Oskar , Czyżewicz Jacek 
Published: January 2019

Abstract
Cold-formed thin-walled sections are prone to local buckling caused by residual stresses, geometrical imperfections and inconsistency of material properties. We present a real case of buckling failure and conduct a numerical and experimental study aimed to identify methods capable of predicting such failures. It is important because designers of structures are getting more FEA-oriented and tend to avoid lengthy procedures of cold-formed structures design. Currently adopted methods are complicated and require patience and caution from a designer which is reasonable in case of the most important structural members but not necessarily so in ordinary design. Since it is important, we offer an insight into several FEA and manual methods which were sufficient to predict the failure while remaining fairly simple. Using a non-uniform partial safety factor was still necessary. We hope that this paper will be of interest for people performing a lot of routine analyses and worrying about reliability of their computations.
Reliability Based Analysis and Design of a Tripod Offshore Wind Turbine Structure Assuring Serviceability Performance
Authors: Zhang Jianhua , Kang Won-Hee , Zhang Chunwei , Sun Ke 
Published: January 2019

Abstract
Typical tripod foundations are designed using deterministic computational models according to relevant standards and codes. However, for more cost-safety balanced design, uncertainties in significant parameters should be considered in preliminary design to ensure meeting a specific probabilistic safety target in the context of the complex configuration of a tripod structure. In this article, uncertainties associated with design parameters and modelling errors are considered using Monte Carlo simulations, in order to determine the key structural design parameters, and to determine the optimal balance between design parameters and design requirements. A Spearman rank-order correlation based analysis is carried out to understand the effects of design variables on maximum deformation, total weight, and natural frequency, and to have insight about important design parameters for improvement of a preliminary design. It is found that the tower diameter has the most significant effect on the maximum displacement on the hub as validated through engineering case studies. In addition, a statistical framework, which identifies influential design parameters and provides reliability evaluation, is proposed for the structural design of a tripod OWT system. The design cases considered in this study indicate that a simple deterministic design check cannot guarantee the required reliability level of the structure, and the cost-safety balance can be achieved by a reliability analysis with the consideration of the uncertainties in the structure.
The Concept of the Process Approach in Corporate Real Estate Management
Authors: Kłosowski Sławomir 
Published: January 2019

Abstract
The paper presents the concept of the process approach in corporate real estate management (CREM). Its objective is to identify and attempt to define the corporate in: corporate real estate and the property management process. In its first part, the paper deals with corporate real estate management and the CREM process approach. The second part presents the concept of the process approach, defining the process of CREM in the context of its determinants and objectives. Further research is presented in the conclusion.
Listing of Developer Companies as a Predictor of the Situation on the Residential Real Estate Market
Authors: Wolski Rafal 
Published: January 2019

Abstract
The stock exchange is considered one of the most important financial institutions in the market economy. The stock market reacts to the state of the economy almost immediately, and, in the end, the quotations of companies affect the state of other markets. The author decided to look at companies from the WIG Real Estate index as important entities shaping the real estate market. When comparing the situation on the capital market with the situation on the residential real estate market, one could, building an appropriate model, conclude how much these markets interact. Purpose - The purpose of the article is to present the links between two important markets, the capital market, with real estate companies as its representatives, and the secondary housing market. In order to achieve the goal, a research hypothesis was formulated: the economic situation on the real estate companies market will be reflected in the situation on the secondary housing market. Design/methodology/approach - Cross-sectional regression analysis was used in the study. Using the data from the Warsaw Stock Exchange and the National Bank of Poland, regression models where price changes in the secondary housing market are explained by the quotations of real estate companies and selected stock exchange indices were built. The study was carried out from the first quarter of 2011 to the third quarter of 2017. Findings - Two models were built in which the rates of return on investments in real estate companies explain the price changes in the secondary housing market in a statistically significant way. Thus, the research hypothesis was positively verified, showing that the real estate market and the stock market of real estate companies are interrelated. Originality/Value - The alternative method of analyzing the real estate market can be considered as the original value of the presented results. A demonstration of the connections between both markets allows us to validate the methods used on the stock market to analyze the real estate market. An example application is the use of methods for estimating the cost of capital from the stock market in the real estate market.
Price as a Measure of Market Value on the Real Estate Market
Authors: Gaca Radosław 
Published: January 2019

Abstract
Issues related to the relationship between prices and values of goods have occupied the minds of economists since the beginnings of economic thought. These considerations concern both general issues and the direct, practical dimension of values. For the real estate market, the main value category considered and used is market value. Its concept has been defined at different levels of legislation, but regardless of how detailed the content of the definitions, they all refer to price as the main basis for reasoning. On the other hand, a part of the economic trends call into question the possibility of measuring values directly on the basis of prices. Consequently, in the light of existing divergences in interpretation, can prices be a good yardstick for value, particularly in the light of the evolving concepts of Highest and Best Use (HaBU) and Hope Value? In an attempt to answer the question, the paper presents considerations on the relationship between prices and value on the real estate market, in particular in the context of the significance of this relationship for the determination of market value. Theoretical studies were supported by empirical research, which allowed for disproving the research hypothesis concerning the relations between the analyzed economic values.
Analysis of Prices in the Housing Market Using Mixed Models
Authors: Cichulska Aneta , Cellmer Radosław 
Published: January 2019

Abstract
Hedonic models, commonly applied for analyzing prices in the property market, do not always fulfil their role, mainly due to the application of simplified assumptions concerning the distribution of variables, the nature of relations or spatial heterogeneity. Classical regression models assumed that the variation of the explained variable (price) is explained by the effect of market features (fixed effects) and the residual component. The hierarchical structure of market data, both as regards market segments and the spatial division, suggests that statistical models of prices should also include random effects for selected subgroups of properties and interactions between variables. The mixed model provides an alternative for constructing various regression models for individual groups or for using binary variables within one model. With its appropriate structure, it makes it possible to take into account both the spatial heterogeneity and to examine the effects of individual features on prices within various property groups. It can also identify synergy effects. The article presents the issue of mixed modelling in the property market and an example of its application in a market of dwellings in Olsztyn. The research used transaction data from the price and value register, supplemented with spatial data. The obtained model was compared with classical regression models and geographically weighted regression. The study also covered the usefulness of mixed models in the mass evaluation of properties, and the possibility of using them in spatial analyses and for the development of property value maps.