bluuebunny/crossref_metadata_2025_split huggingface dataset:
First-Principles Calculation of Cr/S Co-doped Rutile TiO2
Authors: Li Jianning , Wu Fang , Shi Jianying , Ma Lei , Yan Xiaobing , Yang Nan , Ding Bangfu , Zheng Shukai 
Published: November 2020

Abstract
The electronic structures and optical properties of pure, Cr, S single- and Cr/S co-doped rutile TiO2 were calculated by the first-principle plane wave pseudopotential method based on density functional theory. The calculated results indicate that the three different doping ways can lead to lattice distortion in the rutile TiO2 and introduce local electronic states in the forbidden band of TiO2. The local energy levels in the forbidden band of TiO2 are mainly contributed by Cr-3d and S-3p orbital. Compared with pure TiO2, the absorption edges (i.e. the edge of the main peak) of the doped TiO2 have different blue shifts; however, the light response ranges of the doped systems are extended, especially in the case of Cr single- and Cr/S co-doped TiO2. The extension of the visible light response range of the doped TiO2 may enhance its visible light photocatalytic performance. In addition, the co-doped TiO2 has a stronger oxidation ability, which may increase the catalytic efficiency of TiO2.
Building superior lighting properties for WLEDs utilizing two-layered remote phosphor configurations
Authors: Anh Nguyen Doan Quoc , Van Ngoc Hoang 
Published: November 2020

Abstract
The remote phosphor structure produces higher luminous flux but delivers poorer color quality than the conformal or in-cup phosphor structure. To eliminate this weakness, researchers have attempted to improve the chromatic properties of remote phosphor package. This study tends to enhance lighting features for WLEDs including color quality and luminous flux in general or color rendering index (CRI) and color quality scale (CQS) in particular by applying dual-layer remote phosphor structure. In the simulation section, we utilize two identical LEDs that only differ in correlated color temperature values which are 6600 K and 7700 K. The study offers an idea of placing a yellow-green phosphor layer SrBaSiO4:Eu2+ or a red phosphor layer SrwFxByOz:Eu2+,Sm2+ on the yellow phosphor layer YAG:Ce3+ and then modifying the concentrations of SrwFxByOz:Eu2+,Sm2+ and SrBaSiO4:Eu2+ to the suitable values to improve the color quality and lumen output of WLEDs. The results show that red phosphor layer SrwFxByOz:Eu2+,Sm2+ has a significant influence on CRI and CQS improvement. Particularly, the increase of SrwFxByOz:Eu2+,Sm2+ concentration leads to increased CRI and CQS because the red light component increases in WLEDs. On the other hand, the green phosphor layer SrBaSiO4:Eu2+ only brings benefit to the luminous flux. However, the WLEDs’ luminous flux and color quality drop sharply, when SrwFxByOz:Eu2+,Sm2+ and SrBaSiO4:Eu2+ concentrations rise extremely, which is verified based on the Mie-scattering theory and the Lambert-Beer law. In short, the article provides general knowledge and primary information for the production of higher-quality WLEDs.
Development of X-ray scanning system Sowa
Authors: Bogowicz Józef , Chabera Mariusz , Dziewiecki Wojciech , Kaźmierczak Kacper , Klimaszewski Jan , Kosiński Tymoteusz , Łubian Andrzej , Matusiak Michał , Wasilewski Adam , Wojciechowski Marcin , Wronka Sławomir , Zakrzewski Tomasz 
Published: November 2020

Abstract
The new vehicle scanning system Sowa has been developed in the National Centre for Nuclear Research. This innovative device is equipped with a 300 kV X-ray tube, U-shape imaging detector line, transport system, and fully shielded container. Sowa allows for a detailed inspection of the car and the detection of illegal transported items. This article presents the design, applied solutions, and achieved results of Sowa scanning system.
The Effect of External Attentional Focus and Self-Controlled Feedback on Motor Learning in Older Adults
Authors: Razaghi Sima , Saemi Esmaeel , Abedanzadeh Rasool 
Published: November 2020

Abstract

Introduction. External focus instruction and self-controlled feedback have beneficial effects on motor learning. The purpose of the present study was to investigate the benefits of combined effects of external focus instruction and self-controlled feedback on balance performance in older adults.

Material and Methods. Forty older adults (mean age: 63.21 ± 3.6 years; all female) were selected and randomly divided into 4 groups: self-controlled feedback, external attention, external attention/self-controlled feedback and control group. The task of standing on the platform of the stabilometer device and trying to keep the platform horizontally as much as possible was performed in each 30-sec. trial. The participants of self-controlled group received feedback on the timing of balance after the trials. In the external focus of attention, participants noticed the signs that were located horizontally ahead of their feet. The test was conducted in two sessions. In the acquisition phase, 10 trials of 30 seconds were performed and the retention test was completed 24 hours later as 5 trials of 30 seconds.

Results. The results of mixed ANOVA on time data as an indicator of balance in the acquisition phase showed that the mixed group of external focus of attention and self-controlled feedback had better performance than the other groups (p = 0.004). In the retention test, the results of mixed ANOVA showed that the participants in the combined group of external focus and self-controlled feedback had better performance than the other groups (p = 0.006). The external focus of attention and self-controlled feedback performed similarly, and both were superior to the control group (p < 0.05).

Conclusions. The results of this study, supporting the OPTIMAL theory of motor learning in the elderly, showed that the combination of two factors of external focus and self-controlled feedback has a double advantage over the presence of each of the factors. Therefore, it is suggested that the combinations of external focus instructions and self-controlled feedback should be used to improve performance and motor learning in the classes of practical and clinical rehabilitation fields.
Influence of Surface Texture Parameters on Friction Characteristics Under Starved Lubrication
Authors: Wu Shen , Zhang Pan , Wei Haijun , Chen Lei 
Published: November 2020

Abstract
A cylinder liner and piston ring running under starved lubrication near the top dead centre (TDC) and bottom dead centre (BDC) cause abnormal friction and wear during operation of a marine diesel engine. The method of laser texturing is proposed to improve the surface friction property under this condition. Spherical crown pits with different parameters were formed on the surface of samples by femtosecond laser processing. The BDC and TDC conditions of oil starvation were simulated in a reciprocating friction and wear experiment, and a numerical model of surface texture lubrication based on the Reynolds equation was established. The influence of the distribution density, diameter, and depth parameters of the texture on the surface properties was studied. In the BDC condition, compared with the untextured surface, the average coefficient of friction (COF) can be reduced by up to 24% and the average friction force can be reduced by up to 18%. In the TDC condition, the COF can be reduced by up to 19%, and the average friction force can be reduced by up to 18%. Therefore, the textures with various parameters should be arranged in different positions on the cylinder liner; more attention should be paid to the optimisation of diameter in the texture of the cylinder liner near the BDC, whereas more attention should be paid to the optimisation of distribution density in the texture of the cylinder liner near the TDC
The Influence of Water and Mineral Oil on Mechanical Losses in a Hydraulic Motor for Offshore and Marine Applications
Authors: Śliwiński Paweł 
Published: November 2020

Abstract
In this paper, mechanical losses in a hydraulic motor supplied with water and mineral oil (two liquids having significantly different viscosity and lubricating properties) are described and compared. The experimental tests were conducted using a special design (prototype) of a hydraulic satellite motor. The design of the satellite motor is presented. This motor was developed to supply both with water and mineral oil and features a non-circular tooth working mechanism. The paper also characterizes sources of mechanical losses in this motor. On this basis, a mathematical model of these losses has been developed and presented. The results of calculation of mechanical losses according to the model are compared with the experimental results. Experimental studies have shown that the mechanical losses in the motor supplied with water are 2.8 times greater than those in the motor supplied with oil. The work demonstrates that the mechanical losses in both the motor supplied with water and the one supplied with oil are described well by the mathematical model. It has been found that for the loaded motor working at high speed, the simulation results differ from experimental ones by no more than 3% for oil and 4% for water.
Continuous Improvement Challenges: Implementing PBL in One University in Romania
Authors: Mihaela Bârsan Raluca , Ştefania Kifor 
Published: November 2020

Abstract
What do business and education have in common when it comes to continuous improvements? The answer is Lean Principles. Case studies and implementation challenges from some pilot PBL projects in one university, in Romania, are analysed and described in depth, while comparing the educational experience in the university to the challenges and resistance to change that facilitators in the private sector face inside their own companies. Taking this into consideration and based on qualitative data retrieved from interviews carried out in the private sector and in the educational sector, the authors of this paper will present deep insights that are meant to serve as a basis for understanding the “wicked problem” of scalling continuous improvements like Problem Based Learning throughout the entire teaching organization.
Selectivity and Market Timing Skills in Emerging Greek Equity Mutual Funds During the Sovereign Debt Crisis
Authors: Nikolaos Kyriazis A. , Alexandros Koulis , Stephanos Papadamou , Christina Beneki 
Published: November 2020

Abstract
This paper evaluates the performance of seventeen Greek equity mutual funds before and after the sovereign debt crisis. By being based on the Capital Asset Pricing Model (CAPM), the selectivity and market timing skills of these funds are under scrutiny. This takes place by assigning a linear form to the Beta coefficient and transforming the traditional CAPM equation into a second order polynomial. Results provide evidence of an improvement in selectivity and market timing skills for the majority of these emerging funds after the outburst of the debt crisis and the adoption of measures by Troika. Thereby, the potential of excess profit-making possibilities for capable fund managers in the Greek fund market is enhanced during non-conventional periods in comparison to normal times, even though the Efficient Markets Hypothesis (EMH) still holds.
How Do Socially Responsible Human Resource Management and Voluntary Green Behavior Influence Organizational Competitiveness?
Authors: Uddin Md. Aftab , Akter Refa , Al-Amin Md. , Rahman Md. Sahidur , Ferdausy Shameema 
Published: November 2020

Abstract
Environmental sustainability, employees’ green behavior, and socially responsible human resource management (SRHRM) are now becoming the key focuses for many organizations all over the world because of the increasing pressures on them to reduce negative environmental impacts of their activities and to maintain environmental issues. Nowadays, organizational sustainability or competitiveness is also depending on how far an organization is responsible for environmental issues. Hence, the study is an attempt to explore the impact of SRHRM and voluntary green behavior (VGB) on organizational competitiveness (OC). We followed the deductive reasoning approach and applied the second generation regression model, such as a structural equation model (SEM) via AMOS. The result shows that SRHRM significantly explains VGB. Further both SRHRM and VGB are significantly predicting organizational competitiveness. One of the critical implications of the study is to use the SRHRM to stimulate the employees towards VGB for enriching their organizational sustainability leading to its competitiveness. The most important limitation of this study is its sample size (N<200), which prevents the generalizability of the results. Thus, the future studies are directed to use more replies for delimiting the causality of the study.
Reinforced evidence on partial compatibility between Pinus sylvestris and Pinus mugo and on maternal inheritance of chloroplast DNA in the Pinus mugo × Pinus sylvestris cross
Authors: Kormutak Andrej , Galgoci Martin , Bolecek Peter , Gőmőry Dusan , Libantova Jana 
Published: November 2020

Abstract
The crossability relationship between Scots pine (Pinus sylvestris L.) and mountain dwarf pine (Pinus mugo Turra) was tested under field conditions using an artificial pollination approach. There was partial compatibility between the parental species, as evidenced by the amount of filled seeds in their reciprocal crossings and in control variants from self-pollination, controlled intraspecific outcrossing and open pollination of mother trees. The crossability degree in P. sylvestris × P. mugo was characterised by the index 0.15, and the reciprocal crossing by the index 0.18. Crossability of P. sylvestris and P. mugo with their putative hybrid individuals was much higher; the number of filled seeds was comparable with that of the control variants. The reciprocal crossings of P. sylvestris and P. mugo species were highlighted by the opposite inheritance of their chloroplast DNA (cpDNA). The paternal cpDNA inheritance in P. sylvestris × P. mugo and maternal cpDNA inheritance in P. mugo × P. sylvestris was repeatedly confirmed using the cpDNA trnV-trnH/HinfI marker as well as the newly developed partial cpDNA trnV-trnH/AseI marker. The nature of the latter is described in terms of the nucleotide sequence.
The Effect on Constant Heel on Circulation of a Vessel Calculated on the Basis of Investigations of M/S “Ziemia Zamojska” Model
Authors: Mironiuk Waldemar , Panasiuk Arkadiusz , Szymoński Marek 
Published: November 2020

Abstract
The article presents modeling research on the M/S “Ziemia Zamojska” reduced model, carried out in an open fresh water area by a team of employees of the Department of Operating of Floating Vessels, Polish Naval Academy, Gdynia. The research involved circulating the model with constant angle of heel on the selected side, and the main engine set to full speed ahead. Using a real ship to carry this type of investigations is risky. It may lead to some failures like e.g. rudder failure, steering gear malfunction, overload and in some circumstances even main engine seizure. For this reason, ships are not tested with the rudder put to starboard or to port at the full speed ahead setting, even during a “Crash Stop” maneuver. However, based on the analysis of accidents at sea, and practical experience, it appears that during real operating conditions of vessels, there may occur situations when, for the sake of safety, the maneuver mentioned above must be carried out. Therefore, the authors had to conduct model tests of a floating vessel for the described case of ship operation
Ice Drift in the Arctic Ocean
Authors: Dyrcz Czesław 
Published: November 2020

Abstract
The paper presents results of research based on analysis of historical and present studies of the Arctic ice drift. Current information about Arctic ice drift comes from the scientific expedition organized by the Alfred-Wrgener-Institut Helmholtz Centre for Polar and Marine Research (AWI) from Bremerhaven (Germany) in the Arctic Ocean, as a part of the Multidiscipli-nary drifting Observatory for the Study of Arctic Climate (MOSAiC), coming from the deck of the icebreaker RV “Polarstern”. The main purpose of the article was to collect and illustrate information on the phenomenon of ice drift in the Arctic Ocean, considering data from ongoing research during the MOSAiC expedition. The average movement speed of the icebreaker RV “Polarstern” frozen in Arctic ice during the first three legs of the expedition was over 5 Nm/day, which is characteristic of the current data relating to the speed of the Arctic ice drift in the place of research. On the other hand, the article is popular science, and presents the overall characteristics of Arctic ice drift with an indication of the general directions, and speed of its movement. Ice drift speeds in the Arctic can reach exceptionally high values under favorable conditions. The drift of sea ice reaching at its intensity/intensity values close to the limit (dangerous criterion) in these extreme cases is called the “ice river”. The speed of “ice rivers” can reach up to 1–2 knots, however, in extreme conditions up to 9 knots. Based on data from the AWI, correlation points were identified between the speed of Arctic ice drift and the speed of winds and atmospheric pressure values.
Is Church’s Thesis Still Relevant?
Authors: Mycka Jerzy , Olszewski Adam 
Published: November 2020

Abstract
The article analyses the role of Church’s Thesis (hereinafter CT) in the context of the development of hypercomputation research. The text begins by presenting various views on the essence of computer science and the limitations of its methods. Then CT and its importance in determining the limits of methods used by computer science is presented. Basing on the above explanations, the work goes on to characterize various proposals of hypercomputation showing their relative power in relation to the arithmetic hierarchy.
The general theme of the article is the analysis of mutual relations between the content of CT and the theories of hypercomputation. In the main part of the paper the arguments for abolition of CT caused by the introduction of hypercomputable methods in computer science are presented and critique of these views is presented. The role of the efficiency condition contained in the formulation of CT is stressed. The discussion ends with a summary defending the current status of Church’s thesis within the framework of philosophy and computer science as an important point of reference for determining what the notion of effective calculability really is. The considerations included in this article seem to be quite up-to-date relative to the current state of affairs in computer science.1
Heuristic Potential of Antoni Kępiński’s Information Metabolism Model and Data Smog
Authors: Stelmach Michał 
Published: November 2020

Abstract
In this paper I present the explanatory potential of Antoni Kępiński’s model of information metabolism in the question of data smog (data glut, information overload). Kępiński’s model is not well known and the bibliography concerning the model of information metabolism is still rather poor. In the article I present the model as a good heuristics for explaining information exchange between the system and the environment. The particular aim of my deliberations is to use the model of information metabolism to discuss the pathological, although common phenomenon of data smog. This allows for a holistic view of the problem and allows for new statements on data smog, ethical consequences and counteracting the negative consequences of information overload.
Two Entropy Theory Wings as a New Trend for the Modern Means of Air Transport Operational Reliability Measure
Authors: Goncharenko Andriy Viktorovich 
Published: November 2020

Abstract
The paper deals with the uncertainty of the operated system’s possible states hybrid combined optional functions. Traditionally, the probabilities of the system’s possible states are treated as the reliability measures. However, in the framework of the proposed doctrine, the optimality (for example, the maximal probability of the system’s state) is determined based upon a plausible assumption of the intrinsic objectively existing parameters. The two entropy theory wings consider on one hand the subjective preferences functions in subjective analysis, concerning the multi-alternativeness of the operational situation at an individual’s choice problems, and on the other hand the objectively existing characteristics used in theoretical physics. The discussed in the paper entropy paradigm proceeds with the objectively presented phenomena of the state’s probability and the probability’s maximum. The theoretical speculations and mathematical derivations are illustrated with the necessary plotted diagrams.
Some Remark on Oscillation of Second Order Impulsive Delay Dynamic Equations on Time Scales
Authors: Chhatria Gokula Nanda 
Published: November 2020

Abstract
This article deals with the oscillation criteria for a very extensively studied second order impulsive delay dynamic equations on time scale by using the Riccati transformation technique. Some examples are given to show the effect of impulse and to illustrate our main results.
The Weyl Curvature Tensor of Hypersurfaces Under the Mean Curvature Flow
Authors: Moazzaf Ghodrat , Abedi Esmaiel 
Published: November 2020

Abstract
In this paper, we study the evolution of the Weyl curvature tensor W of hypersurfaces in 𝕉
n

+1 under the mean curvature flow. We find a bound for the Weyl curvature tensor of hypersurfaces during the evolution in terms of time. As a consequence, we suppose that the initial hypersurface is conformally flat, i.e., W =0 at t = 0 and then we find an upper estimate for W during the evolution in terms of time.
Rozwój przedmieść a globalizacja: zróżnicowanie przebiegu procesów suburbanizacji na świecie i w Polsce
Authors: Koj Jacek 
Published: November 2020

AbstraktProcesy suburbanizacji, jak każde zjawisko o charakterze przestrzennym, wykazują zróżnicowanie w zależności od odmiennych systemów politycznych, prawno-instytucjonalnych, gospodarczych i społecznych. Z drugiej jednak strony globalizacja rynków, nasilanie powiązań międzynarodowych poprzez migracje oraz łatwy przepływ informacji mogą przyczyniać się do zacierania regionalnych i lokalnych odmienności tego zjawiska. Celem artykułu jest identyfikacja regionalnej i lokalnej specyfiki przebiegu suburbanizacji zarówno pod względem ilościowym, jak i jakościowym. Tekst oparty został na przeglądzie zagranicznej i krajowej literatury naukowej dokonanym metodą wyszukiwania według słów kluczowych. Aby zrealizować cel, dokonano analizy i porównania charakterystyki procesów suburbanizacji w Stanach Zjednoczonych, Europie Zachodniej oraz w krajach postsocjalistycznych, w tym w Polsce. Najłatwiej dostrzegalne różnice to czas trwania procesu – najdłuższy w Stanach Zjednoczonych, a najkrótszy w krajach postsocjalistycznych – oraz udział funkcji innych niż mieszkaniowa w rozwoju przedmieść – największy w USA. Spośród cech ilościowych zwrócono szczególną uwagę na zróżnicowanie zasięgu, skali i dynamiki procesu w omawianych obszarach, natomiast pod względem jakościowym istotne różnice zaobserwowano w zakresie struktury społecznej mieszkańców suburbiów i układów przestrzennych zabudowy. Jednak, co istotne, analizując przebieg zjawiska w Polsce pod kątem powyższych cech, nie zaobserwowano jednoznacznych wyróżników na tle innych państw Europy Środkowo-Wschodniej.