bluuebunny/crossref_metadata_2025_split huggingface dataset:
Lessons Not Learned: Why is There Still a Crisis-Level Shortage of Accounting Ph.D.s?
Authors: Plumlee R. David , Reckers Philip M. J. 
Published: January 2014

SYNOPSIS:
In 2005, an ad hoc committee appointed by the American Accounting Association (AAA) documented a crisis-level shortage of accounting Ph.D.s and recommended significant structural changes to doctoral programs (Kachelmeier, Madeo, Plumlee, Pratt, and Krull 2005). However, subsequent studies show that the shortage continues and the cumulative costs grow (e.g., Fogarty and Holder 2012; Brink, Glasscock, and Wier 2012). The Association to Advance Collegiate Schools of Business (AACSB) recently called for renewed attention to the problem (AACSB 2013b). We contribute to the literature by providing updated information regarding responses by doctoral programs and, from the eyes of potential candidates, of continuing impediments to solving the doctoral shortage. In this paper, we present information gathered through surveys of program administrators and master's and Accounting Doctoral Scholars Program (ADS) students. We explore (1) the cumulative impact of the Ph.D. shortage as of 2013, including its impact on accounting faculty composition, across different types of institutions, (2) negative student perceptions of Ph.D. programs and academic accounting careers, which discourage applicants from pursuing Ph.D. programs, and (3) impediments facing institutions in expanding doctoral programs.
Acoustic Absorption of a New Class of Alumina Foams with Various High-Porosity Levels
Authors: Zieliński Tomasz G. , Potoczek Marek , Śliwa Romana E. , Nowak Łukasz J. 
Published: January 2014

Abstract
Recently, a new class of ceramic foams with porosity levels up to 90% has been developed as a result of the association of the gelcasting process and aeration of the ceramic suspension. This paper presents and discusses original results advertising sound absorbing capabilities of such foams. The authors man- ufactured three types of alumina foams in order to investigate three porosity levels, namely: 72, 88, and 90%. The microstructure of foams was examined and typical dimensions and average sizes of cells (pores) and cell-linking windows were found for each porosity case. Then, the acoustic absorption coefficient was measured in a wide frequency range for several samples of various thickness cut out from the foams. The results were discussed and compared with the acoustic absorption of typical polyurethane foams proving that the alumina foams with high porosity of 88-90% have excellent sound absorbing properties competitive with the quality of sound absorbing PU foams of higher porosity.
Are law-invariant risk functions concave on
distributions?
Authors: Acciaio Beatrice , Svindland Gregor 
Published: January 2014

Abstract
While it is reasonable to assume that convex combinations
on the level of random variables lead to a reduction of risk
(diversification effect), this is no more true on the level of distributions.
In the latter case, taking convex combinations corresponds
to adding a risk factor. Hence, whereas asking for
convexity of risk functions defined on random variables makes
sense, convexity is not a good property to require on risk functions
defined on distributions. In this paper we study the interplay
between convexity of law-invariant risk functions on random
variables and convexity/concavity of their counterparts
on distributions. We show that, given a law-invariant convex
risk measure, on the level of distributions, if at all, concavity
holds true. In particular, this is always the case under the
additional assumption of comonotonicity.
Prediction of time series by statistical learning:
general losses and fast rates
Authors: Alquier Pierre , Li Xiaoyin , Wintenberger Olivier 
Published: January 2014

Abstract
We establish rates of convergences in statistical learning for
time series forecasting. Using the PAC-Bayesian approach,
slow rates of convergence
√ d/n for the Gibbs estimator under
the absolute loss were given in a previous work [7], where
n is the sample size and d the dimension of the set of predictors.
Under the same weak dependence conditions, we
extend this result to any convex Lipschitz loss function. We
also identify a condition on the parameter space that ensures
similar rates for the classical penalized ERM procedure. We
apply this method for quantile forecasting of the French GDP.
Under additional conditions on the loss functions (satisfied
by the quadratic loss function) and for uniformly mixing processes,
we prove that the Gibbs estimator actually achieves
fast rates of convergence d/n. We discuss the optimality of
these different rates pointing out references to lower bounds
when they are available. In particular, these results bring a
generalization the results of [29] on sparse regression estimation
to some autoregression.
Importance of Motivating Factors for International Mobility of Students: Empirical Findings on Selected Higher Education Institutions in Europe
Authors: Novak Riko , Slatinšek Anja , Devetak Gabrijel 
Published: January 2014

Abstract
This article explores the importance of motivating factors for the international mobility of undergraduate students who participated in a mobility programme and completed part of their studies at selected higher education institutions. The empirical research was conducted on a population of 3,539 mobile undergraduate students, who took part in mobility programmes between 2006 and 2011 at three selected higher education institutions in three different European countries (1 - Germany: Duale Hochschule Baden‑Württemberg Karlsruhe, 2 - Norway: University of Tromsø, 3 - Slovenia: University of Primorska, Faculty of Management). The purpose of this article is to present the underlying motivating factors in relation to the selected institution on a sample of 288 undergraduate students during the period studied. On the basis of these findings, we came to the conclusion that most of the students participated in students’ mobility programmes especially to gain international study and life experiences. Furthermore, we established a statistically significant difference in the duration of a mobility period in connection with gender and the satisfaction with the mobility programme.
Removal of low molecular organic acids from aqueous solutions with reactive extraction
Authors: Szternel Dominika , Regel-Rosocka Magdalena , Wiśniewski Maciej 
Published: January 2014

Abstract
This paper presents investigation on removal of low molecular organic acids (acetic, lactic, succinic and fumaric) from aqueous solutions with reactive extraction. The results specifically show that the extraction efficiency of acids depends on the type of extractant, diluents of the organic phase and the initial pH of the aqueous phase. It is possible to separate succinic or fumaric from lactic and acetic acids with high selectivity with the use of TOA and Aliquat 336, respectively. Increasing the pH of the aqueous phase results in a reduction of fumaric acid extraction efficiency with solvating extractants. This can be explained by the decreasing share of acidic form, whose extraction is favored by these extractants. Efficient extraction of both fumaric acid and fumarate using Aliquat 336 can be explained by the ionic structure of the quaternary ammonium salt, capable of transporting both forms of the acid.
Synthesis and physicochemical characterization of silicafillers modified with octakis({3-methacryloxypropyl}dimethylsiloxy) octasilsesquioxane
Authors: Szwarc-Rzepka K. , Gogola N. , Siwińska-Stefańska K. , Marciniec B. , Jesionowski T. 
Published: January 2014

Abstract
Hybrid nanofillers of silica grafted with octakis({3-methacryloxypropyl}dimethylsiloxy) octasilsesquioxane were obtained by the method based on solvent evaporation with the use of both hydrated or emulsion spherical silica. Octakis({3-methacryloxypropyl}dimethylsiloxy) octasilsesquioxane was applied as a modifying agent and it was synthesized by employing the hydrosilylation reaction. The effectiveness of modification of the hybrid nanofillers obtained was verified using Fourier transform infrared spectroscopy and nuclear magnetic resonance (29Si and 13C CP MAS NMR). The products obtained were characterized by determination of their physicochemical properties and porous structure, including specific surface area, pore diameter and pore volume. Dispersion degree and particle size of the nanofillers was characterized by NIBS (Non-Invasive Back-scatter) method and laser diffraction technique, while their morphology by transmission electron microscopy.
Remediation of heavy metals from soil using quartz sand functionalized with organic amino silanes
Authors: Grzesiak Piotr , Łukaszyk Joanna , Schroeder Grzegorz , Kurczewska Joanna 
Published: January 2014

Abstract
The results of the research studies concerning the binding of heavy metals (HMs) by quartz sand functionalized with amino silanes have been described. The studies have been carried out on soils sampled from the areas affected by emissions from Copper Smelter and Refinery. The research aims to increase the food safety in the areas of industrial impact. The presence of polyamine chain in the hybrid materials obtained enables a binding of heavy metals (nickel, copper, cobalt). The best results are observed for the hybrid material having four amine groups (four coordination centers) per molecule. For this material the highest content after two extraction cycles (pH 7.0 and 5.0) is observed for copper (98.2%), but for other ions (nickel, cobalt) it is at least 85% of the initial amount of components available for plants.
Existence of mild solutions for semilinear differential equations with nonlocal and impulsive conditions
Authors: Olszowy Leszek 
Published: January 2014

Abstract
This paper is concerned with the existence of mild solutions for impulsive semilinear differential equations with nonlocal conditions. Using the technique of measures of noncompactness in Banach and Fréchet spaces of piecewise continuous functions, existence results are obtained both on bounded and unbounded intervals, when the impulsive functions and the nonlocal item are not compact in the space of piecewise continuous functions but they are continuous and Lipschitzian with respect to some measure of noncompactness, and the linear part generates only a strongly continuous evolution system.
Variability of Abies alba-dominated forests in Central Europe
Authors: Świerkosz Krzysztof , Reczyńska Kamila , Boublík Karel 
Published: January 2014

Abstract
Using vegetation databases from Poland, the Czech Republic, Austria, Slovakia and our own material collected during a field work, we have analysed the variability of species composition of Abies alba-dominated communities in Central Europe. Analysis was performed using a modified TWINSPAN algorithm in the JUICE software. Ecological analysis was performed on the basis of mean Ellenberg indicator values with a MoPeT_v1.0.r script prepared in R software. In general, the findings indicated that there are at least 8 types of Central European silver fir-dominated forests with different patterns in species composition and habitat conditions. These are the oligotrophic subcontinental silver fir forests of the Polish highlands, oligotrophic (sub)montane silver fir forest, hygrophilous silver fir forests, oligo-mesotrophic (sub)montane silver fir forests, mesotrophic (sub)montane silver fir forests, submontane and montane calcicolous silver fir forests of the Alps and the Carpathians, eutrophic silver fir-beech forests and silver fir ravine forests. The main conclusion is that the diversity of species composition of Abies alba-dominated forests in Central Europe is lower than described in current regional synthesis, which was confirmed by ecological analyses.
Percussion signals of Lygus rugulipennis Poppius (Heteroptera: Miridae)
Authors: Koczor Sándor , Cokl Andrej 
Published: January 2014

Abstract
The European tarnished plant bug (Lygus rugulipennis Poppius) is among the most serious pests in the family Miridae, and therefore there is increasing interest in understanding the behaviour of this species. In the present study, laboratory recordings were taken using a laser vibrometer on adult males and females to ascertain whether acoustic signals are involved in intraspecific communication. Recordings were both carried out on plant and loudspeaker membrane substrates. Males and females emitted vibratory signals and the present results indicate that these signals are important during courtship. The basic signal characteristics measured were the dominant frequency, pulse duration, repetition time and number of pulses per group within the signal. Male and female signals did not differ in respect to any of these characteristics. Plant recorded signals were longer because of different mechanical properties of substrates. Additionally, the high frequency components were attenuated due to the low-pass filtering properties of plants. As this is the first study on vibratory communication of the European tarnished plant bug, we believe these findings may contribute considerably to the better understanding of the mating behavior of this important pest species.
High intraspecific genetic and morphological variation in the pioneer lichen Cladonia rei colonising slag dumps
Authors: Osyczka Piotr , Rola Kaja , Lenart-Boroń Anna , Boroń Piotr 
Published: January 2014

Abstract
This study investigates the genetic and morphological variability of the lichen Cladonia rei inhabiting strongly contaminated postsmelting slag dumps in southern Poland. Altogether, 27 C. rei samples were analysed, including 17 from a single population in one dump. The phylogenetic analysis includes samples of C. rei, outgroup species, and external sequences of Cladonia section representatives from GenBank. Comparative analysis of the internal transcribed spacer (ITS) rDNA sequences revealed the presence of 19 C. rei haplotypes overall, including several of the most frequent, of which 11 are represented by single individuals only. As many as 12 haplotypes were recorded within a single population. Three strongly supported monophyletic clades comprised of specimens from different geographical regions were recovered. Morphometric analysis showed great phenotypic variability within particular clades. Apart from a full range of previously known morphological forms of the species, an additional specific morphotype was recognised in the dumps; however, its representatives do not create a monophyletic group. High genetic variability within a single population suggests that C. rei has a great potential for colonising anthropogenic habitats. This attribute emphasises the role of this lichen as an essential pioneer in the early stages of natural regeneration of such sites.
Acute and joint toxicity of twelve substituted benzene compounds to Propsilocerus akamusi Tokunaga
Authors: Cao Chuan-Wang , Niu Fang , Li Xiao-Peng , Ge Shi-Lin , Wang Zhi-Ying 
Published: January 2014

Abstract
This study investigated the toxic effects of 12 substituted benzenes exposed to Propsilocerus akamusi larvae singly and as mixtures. Their toxicities were quantified in terms of median effective concentration (EC50) killing 50% of the larvae. For individual substituted benzenes to 4th-instar P. akamusi larvae, the toxicity was in decreasing order of p-chlorophenol > nitrobenzene > phenol > 1,2-dimethylbenzene > 1,3-dimethylbenzene > chlorobenzene > p-phenylenediamine > 1,4-dimethylbenzene > m-phenylenediamine > methylbenzene > benzene > aniline. The order of toxicity among three isomers of dimethylbenzene was 1,2-dimethylbenzene > 1,3-dimethylbenzene > 1,4-dimethylbenzene while p-phenylenediamine > m-phenylenediamine. The binary substituted benzene compounds’ toxicities were evaluated by toxic unit (TU), additive index (AI), mixture toxicity index (MTI) and similarity parameter index (λ). The evaluation results of TU and MTI for 9 substituted benzene compounds were completely consistent while the results of AI were the same as the results of λ based on 24 h EC50 of binary substituted benzenes. The evaluation results of 10 substituted benzene compounds were consistent using TU, MTI, AI and λ evaluation methods. 52.63% and 47.37% of binary substituted benzene tests on P. akamusi larvae showed synergism and partial addition/antagonism, respectively, under mixtures of equal proportions. These results suggest that substituted benzenes indicate acute and binary joint toxicity to P. akamusi.
Synthesis, crystal structures, spectral, electrochemical and magnetic properties of di-µ-phenoxido-bridged dinuclear copper(II) complexes with N-salicylidene-2-hydroxybenzylamine derivatives: axial coordination effect of dimethyl sulphoxide molecule
Authors: Kakuta Yoshihisa , Masuda Naoyuki , Kurushima Michihiro , Hashimoto Takashi , Yoshioka Daisuke , Sakiyama Hiroshi , Hiraoka Yuya , Handa Makoto , Mikuriya Masahiro 
Published: January 2014

AbstractThe template reaction of salicylaldehyde and its substituted derivatives and 2-hydroxy-5-bromobenzylamine or 2-hydroxy-5-chlorobenzylamine with copper(II) acetate in dimethyl sulphoxide (dmso) afforded eight dinuclear Cu(II) complexes, [Cu2(L)2(dmso)2] (H2 L = N-salicylidene-2-hydroxy-5-bromobenzylamine, N-salicylidene-2-hydroxy-5-chlorobenzylamine and their 5-bromo, 5-nitro and 5-methyl-substituted salicylidene derivatives). These Cu(II) complexes were characterised by IR and UV-VIS-NIR spectroscopy, electric conductivity, cyclic voltammetry, and temperature dependence of magnetic susceptibilities (4.5–300 K). In the THF solution, the complexes are nonelectrolytes and exhibit a characteristic CT band due to phenoxido-bridging at 360–384 nm. In the cyclic voltammograms, an irreversible reduction process was observed at −1.18–1.54 V vs Fc/Fc+. Single-crystal X-ray crystallography revealed that two Cu(II) ions were bridged by the two phenoxido-oxygen atoms of the two Schiff-base ligands with axial coordination of dmso molecules forming a square pyramid with a Cu-Cu distance of 3.0628(8)–3.0931(6) °A. In accordance with the crystal structures, the magnetic interaction between the two Cu(II) ions is relatively anti-ferromagnetic with −2J value of 386–575 cm−1. The axial coordination effect of the dmso molecule was discussed in relation to the correlation between the Cu-O-Cu angle and the −2J value.
Hemilabile imino-phosphine palladium(II) complexes: synthesis, molecular structure, and evaluation in Heck reactions
Authors: Motswainyana William , Onani Martin , Lalancette Roger , Tarus Paul 
Published: January 2014

AbstractThe ligands 2-(diphenylphosphino)benzyl-(2-thiophene)methylimine (V) and 2-(diphenylphosphino) benzyl-(2-thiophene)ethylimine (VI) were prepared from 2-(diphenylphosphino)benzaldehyde and thiophene amines with very good yields. An equimolar reaction of V and VI with either PdCl2(cod) (cod = cyclooctadiene) or PdClMe(cod) afforded palladium(II) complexes I–IV. The molecular structure of II was confirmed by X-ray crystallography. The coordination geometry around the palladium atom exhibited distorted square planar geometry at the palladium centre. Complexes I, II, and IV were evaluated as catalysts for Heck coupling reactions of iodobenzene with methyl acrylate under mild reaction conditions; 0.1 mole % catalyst, Et3N base, MeCN reflux for 8 h, 80°C; isolated yield on a 10 mmol scale with catalyst I (64 %), II (68 %), and IV (58 %). They all exhibited significant activities.
Alkaline hydrogen peroxide pretreatment of energy crops for biogas production
Authors: Michalsk Karina , Ledakowicz Stanisław 
Published: January 2014

AbstractIn this study, the influence of alkaline hydrogen peroxide (H2O2) pretreatment of the three different plant sources: Miscanthus giganteus, Sorghum Moench, and Sida hermaphrodita, for biogas production was investigated. The influence of temperature, reaction time, and H2O2 concentration on the efficiency of biomass degradation and on the further methanogenic fermentation were studied. The results obtained after chemical pretreatment indicate that using H2O2 at alkaline conditions leads to the decomposition of three major structures: lignin, hemicellulose, and cellulose. The best results were achieved for the process performed at 25°C for 24 h with the use of a 5 mass % H2O2 solution. Although the degradation level was very high for all three plant sources, the biogas production from the energy crops pretreated chemically was strongly inhibited by byproducts and the residual oxygen formed after H2O2 decomposition. This fact indicates that alkaline H2O2 pretreatment is a very promising method for plant material degradation for further biogas production, but pretreated biomass must be separated from supernatant before the fermentation process because of the high concentration of inhibitors in the hydrolysates. The best results were obtained for Sida with biogas and methane production of 2.29 Ndm3 and 1.06 Ndm3, respectively.
Exergames as a Teaching Tool in Physical Education?
Authors: Meckbach Jane , Gibbs Béatrice , Almqvist Jonas , Öhman Marie , Quennerstedt Mikael 
Published: January 2014

Abstract
Video games are often highlighted as risk factors in relation to physical inactivity and increasing levels of obesity. Now a new type of video game, the exergame, has entered the market. In recent years, several countries have increasingly foregrounded exergames as a possible activity for use in school PE and as perhaps improving young people’s knowledge, skills, attitudes, and behaviors in relation to health and physical exercise. The purpose of this study is to explore Swedish PE teachers’ perceptions and use of exergames and also the barriers to and reasons for using exergames based on a survey containing closed- and open-ended questions. A total of 493 teachers (10% of all Swedish PE teachers) answered the questionnaire. The responses were coded and entered into SPSS, allowing for both descriptive data and cross-table analyses. The results show that 80 percent are familiar with exergames, 17 percent are recreational exergamers, and a few (3%) have tried using exergames in physical education and health. The reasons for introducing exergames are generally as follows: encouraging physical activity, offering different types of movement, and having fun. The barriers to introducing exergames are mainly: financial, prioritizing other activities, and the teachers’ own knowledge. The majority of the PE teachers are generally positive to introducing exergames as a teaching aid into their subject. However, this requires developing the teachers’ own knowledge of exergames. The choice of teaching content and the introduction of new activities and teaching tools also involve critically examining the games, and this, in turn, entails didactic reflection.