bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Matrix Viscosity on Rheological and Microwave Properties of Polymer Nanocomposites with Multiwall Carbon Nanotubes
Authors: Kotsilkova R. , Ivanov E. , Bychanok D. , Paddubskaya A. , Kuzhir P. 
Published: June 2014

Abstract
Nanocomposites of multiwalled carbon nanotubes (MWCNTs) in epoxy resin and polypropylene (PP) are studied. The effect of matrix viscosity on the degree of dispersion of nanotubes is determined by rheological methods. Rheology and microwave properties are correlated to estimate the optimal limits of nanofiller content required for improving the performance of nanocomposites. Rheological percolation threshold is determined for both types nanocomposites, ϕp=0.27% for the epoxy/MWCNT and; ϕp=1.5% for the PP/MWCNT, as found critical for achieving a network structure of interacting nanotubes in the matrix polymer. Good electromagnetic shielding efficiency was obtained for nanocomposites at nanotube contents above the rheological percolation. Low viscosity matrix facilitates contacts between MWCNTs, resulting in appearance of electromagnetic shielding at very low percolation threshold.
An Investigation of Planning Practices in Select Companies
Authors: Wyrozębski Paweł , Spałek Seweryn 
Published: June 2014

Abstract
The aim of the article is to answer two research questions concerning the influence of organizational factors and shape of project portfolio on the content and scope, as well as on the stakeholders engagement in project planning. The research strategy included a questionnairebased method. The respondents were representatives of the chosen companies located in Poland, from varied types of industries. The key research finding is that most frequently addressed areas of project planning are those of the iron-triangle of project constraints. There is still lack of understanding for communication, risk and quality planning in projects, which is consonant with recent studies of maturity in project management areas. There are significant differences between industries in terms of areas of project planning. Power engineering seems to be more mature in terms of more frequent practices of planning the project schedule, resources and risk. The research showed a number of significant correlations between components of project planning and both organizational and project portfolio factors, which justifies the statement that those factors can be seen as determinants of project planning practices.
Characteristics of a national sample of victims of intimate partner violence (IPV): Associations between perpetrator substance use and physical IPV
Authors: Lund Ingunn Olea 
Published: June 2014

Background This paper provides a characterisation of a national sample of intimate partner violence (IPV) victim shelter residents. The study also examines whether perpetrator substance use contributed to physical IPV in 2 subsamples: 1) Norwegian victims and perpetrators, and 2) immigrant victims and perpetrators. Methods A national sample (N=1363) of women at IPV shelters in Norway in 2011. Results The majority (62.2%) of the women had immigrant background, and social security was the most common employment/income status (42.6%). A combination of psychological and physical IPV was most frequently reported (56.1%). Perpetrator substance use was common in the Norwegian sample (57.5%). while many in the immigrant sample (47.1%) were unsure about perpetrator substance use. Perpetrator substance use was associated with physical IPV in both subsamples. Conclusion Immigrant IPV victims are overrepresented in the shelter population, as are women on social security. While substance use is associated with physical IPV among Norwegians and immigrants, the association is more obvious in the Norwegian sample. The high rates of immigrant women stating they are unsure about perpetrator substance use underscore the importance that future studies address this question in a culturally sensitive matter.
Role of Creative Industries in the Post-Socialist Urban Transformation
Authors: Stryjakiewicz Tadeusz , Męczyński Michał , Stachowiak Krzysztof 
Published: June 2014

Abstract
Over the past two decades the cities in Central and Eastern Europe have witnessed a wide-ranging transformation in many aspects. The introduction of a market-oriented economy after half a century of socialism has brought about deep social, economic, cultural and political changes. The first stage of the changes, the 1990s, involved the patching up of structural holes left by the previous system. The post-socialist city had to face challenges of the future while carrying the ballast of the past. Rapid progress in catching up with the West transformed the city a great deal. Later on, the advent of the 21st century brought a new wave of development processes based, among other things, on creativity and innovation. Hence our contribution aims to explore the role of creativity and creative industries in the post-socialist urban transformation. The article consists of three basic parts. In the first we present the concept of a ‘creative post-socialist city’ and define the position of creative industries in it. We also indicate some similarities to and differences from the West European approaches to this issue. In the second part, examples from Central and Eastern Europe are used in an attempt to elucidate the concept of a ‘creative post-socialist city’ by identifying some basic features of creative actions /processes as well as a creative environment, both exogenous and endogenous. The former is embedded in different local networks, both formal (institutionalised) and informal, whereas the structure of the latter is strongly path-dependent. In the third part we critically discuss the role of local policies on the development of creative industries, pointing out some of their shortcomings and drawing up recommendations for future policy measures.
Contemporary Determinants of the Development of Socio-Economic Regions
Authors: Czyż Teresa 
Published: June 2014

Abstract
This article examines the effect on the development of socio-economic regions in Poland of contemporary external determinants considered at the European and the world scale. It consists of two parts. The first gives a description of the main general processes that are external determinants of regional development today: modernisation changes, globalisation, metropolitanisation, and European integration. Part two is empirical in character and seeks to find regional manifestations and effects of those determinants in Poland, and to establish how they influence regional income and spatial differences in its value.
Agrarian-Economic Structure of Agricultural Holdings in Poland and East Germany: Selected Elements of Comparative Analysis
Authors: Jezierska-Thöle Aleksandra , Janzen Jörg , Rudnicki Roman 
Published: June 2014

Abstract
The aim of this study was to determine differences in the development of farms in Poland against the agriculture of East Germany, and to show areas with similar conditions for development. The time range of the research covered the years 2002-2010, i.e. the stage of preparation of Polish agriculture for accession to the European Union, the implementation of pre-accession aid programmes, and the establishment and implementation of the tools of the Common Agricultural Policy. To assess the level of agricultural development, natural, productive and social characteristics were adopted. Spatial variations in the analysed features were based on the variation coefficient (Vz), and the level of agricultural development, on Perkal’s index (Wi). In the analysed period the range of variation and the degree of the spatial dispersion of sub-indices changed, indicating a deepening of the polarisation processes in agriculture. The implementation of CAP intensified the process of specialisation and modernisation in agriculture, an example of which is the increase in the average farm size and in agricultural productivity. On the other hand, agricultural production intensified, as exemplified by a decrease in the minimum value in six of the analysed characteristics, which indicates growing disparities.
Social Inclusion by Revitalisation? The Potential of Disused Industrial Areas as an Opportunity for Mitigating Social Polarisation
Authors: Otto Marius , Chmielewska Marta 
Published: June 2014

Abstract
The paper concerns the relation between revitalisation projects and socio-economic polarisation, and discusses the potential of new urban spaces for social inclusion. The phenomenon is considered on the example of recreational facilities that have emerged from brownfields located in the Ruhr region (Germany). It was ascertained that the diversity of implemented projects was important in terms of the significance of revitalisation processes for social polarisation tendencies. It allowed regional authorities to create income-generating facilities and spaces that can be used regardless of income, and to resolve deficits in urban recreational facilities. It was also noted that the Ruhr examples could provide guidance for the recently begun revitalisation processes in the Upper Silesian industrial area (Poland).
Metformin Impacts the Prognosis of Cancer Patients with Type 2 Diabetes
Authors: Aldea Mihaela , Craciun Lucian , Crivii Carmen 
Published: June 2014

Abstract
A long term complication of diabetes is the increased susceptibility to develop various malignancies and also to negatively impact the progression of cancer. However, metformin, widely used in the treatment of type II diabetes, seems to impact the outcome of several types of cancer, in terms of overall survival, disease-free survival or rates of recurrences. Metformin might impact cancer through various mechanisms, including reduced insulin and insulin-like growth factor-mediated signaling as well as modulation of inflammation and adipokine activity. This review presents the clinical studies that deal with the prognostic impact of metformin on cancer and discuss the possible reasons for why certain types of cancer are affected by anti-diabetic therapy. In addition, it tries to integrate the preclinical and clinical evidence into guidelines for future prospective clinical studies
Management of Diabetes Mellitus in Patients with Acquired Immunodeficiency Syndrome
Authors: Miulescu Rucsandra Dănciulescu , Neamțu Marius Cristian , Dănoiu Suzana , Culman Mirela , Păun Diana Loreta , Poiană Cătalina 
Published: June 2014

Abstract
Acquired immunodeficiency syndrome (AIDS) is a human immune system disease characterized by increased susceptibility to opportunistic infections, certain cancers and neurological disorders. The syndrome is caused by the human immunodeficiency virus (HIV) that is transmitted through blood or blood products, sexual contact or contaminated hypodermic needles. Antiretroviral treatment reduces the mortality and the morbidity of HIV infection but is increasingly reported to be associated with increasing reports of metabolic abnormalities. The prevalence and incidence of diabetes mellitus in patients on antiretroviral therapy is high. Recently, a joint panel of American Diabetes Association (ADA) and European Association for the Study of Diabetes (EASD) experts updated the treatment recommendations for type 2 diabetes (T2DM) in a consensus statement which provides guidance to health care providers. The ADA and EASD consensus statement concur that intervention in T2DM should be early, intensive, and uncompromisingly focused on maintaining glycemic levels as close as possible to the nondiabetic range. Intensive glucose management has been shown to reduce microvascular complications of diabetes but no significant benefits on cardiovascular diseases. Patients with diabetes have a high risk for cardiovascular disease and the treatment of diabetes should emphasize reduction of the cardiovascular factors risk. The treatment of diabetes mellitus in AIDS patients often involves polypharmacy, which increases the risk of suboptimal adherence
A classification of the torsion tensors on almost contact manifolds with B-metric
Authors: Manev Mancho , Ivanova Miroslava 
Published: June 2014

AbstractThe space of the torsion (0,3)-tensors of the linear connections on almost contact manifolds with B-metric is decomposed in 15 orthogonal and invariant subspaces with respect to the action of the structure group. Three known connections, preserving the structure, are characterized regarding this classification.
Partial regularity of solution to generalized Navier-Stokes problem
Authors: Mácha Václav 
Published: June 2014

AbstractIn the presented work, we study the regularity of solutions to the generalized Navier-Stokes problem up to a C 2 boundary in dimensions two and three. The point of our generalization is an assumption that a deviatoric part of a stress tensor depends on a shear rate and on a pressure. We focus on estimates of the Hausdorff measure of a singular set which is defined as a complement of a set where a solution is Hölder continuous. We use so-called indirect approach to show partial regularity, for dimension 2 we get even an empty set of singular points.
Eigenvalues and eigenfunctions of the anharmonic oscillator V(x, y) = x 2 y 2
Authors: Fernández Francisco , Garcia Javier 
Published: June 2014

AbstractWe obtain sufficiently accurate eigenvalues and eigenfunctions for the anharmonic oscillator with potential V(x, y) = x 2 y 2 by means of three different methods. Our results strongly suggest that the spectrum of this oscillator is discrete in agreement with early rigorous mathematical proofs and against a recent statement that cast doubts about it
Travelling wave solutions: A new approach to the analysis of nonlinear physical phenomena
Authors: Sayevand Khosro , Baleanu Dumitru , Fardi Mojtaba 
Published: June 2014

AbstractIn this manuscript, a reliable scheme based on a general functional transformation is applied to construct the exact travelling wave solution for nonlinear differential equations. Our methodology is investigated by means of the modified homotopy analysis method which contains two convergence-control parameters. The obtained results reveal that the proposed approach is a very effective. Several illustrative examples are investigated in detail.
A new method of calculation in the Fractional Quantum Hall Effect regime
Authors: Bentalha Zine , Moumen Larabi , Ouahrani Tarik 
Published: June 2014

AbstractThe electron-electron and electron-background interaction energies are calculated analytically for systems with up to N = 6 electrons. The method consists of describing the position vectors of electrons using complex coordinates and all the interaction energies with complex notation, whereby simplifications become possible. As is known, in this type of calculation, complicated expressions involving integrals over many variables are encountered and the trick of using complex coordinates greatly facilitates the exact calculation of various quantities. Contrary to previous analytical calculations, using complex coordinates avoids complicated trigonometric functions from appearing in the integrand, simplifying the exact evaluation of the integrals. The method we have used can be straightforwardly extended to larger systems with N > 6 electrons.
One-dimensional Bose-Hubbard model with pure three-body interactions
Authors: Sowiński Tomasz 
Published: June 2014

AbstractThe extended Bose-Hubbard model with pure three-body local interactions is studied using the Density Matrix Renormalization Group approach. The shapes of the first two insulating lobes are discussed, and the values of the critical tunneling for which the system undergoes the quantum phase transition from insulating to superfluid phase are predicted. It is shown that stability of insulating phases, in contrast to the standard Bose-Hubbard model, is enhanced for larger fillings. It is also shown that, on the tip of the boundary of the insulating phase, the model under consideration belongs to the Berenzinskii-Kosterlitz-Thouless universality class.
The use of simulation in neurosurgical education and training
Authors: Kirkman Matthew A. , Ahmed Maria , Albert Angelique F. , Wilson Mark H. , Nandi Dipankar , Sevdalis Nick 
Published: June 2014

Object
There is increasing evidence that simulation provides high-quality, time-effective training in an era of resident duty-hour restrictions. Simulation may also permit trainees to acquire key skills in a safe environment, important in a specialty such as neurosurgery, where technical error can result in devastating consequences. The authors systematically reviewed the application of simulation within neurosurgical training and explored the state of the art in simulation within this specialty. To their knowledge this is the first systematic review published on this topic to date.

Methods
The authors searched the Ovid MEDLINE, Embase, and PsycINFO databases and identified 4101 articles; 195 abstracts were screened by 2 authors for inclusion. The authors reviewed data on study population, study design and setting, outcome measures, key findings, and limitations.

Results
Twenty-eight articles formed the basis of this systematic review. Several different simulators are at the neurosurgeon's disposal, including those for ventriculostomy, neuroendoscopic procedures, and spinal surgery, with evidence for improved performance in a range of procedures. Feedback from participants has generally been favorable. However, study quality was found to be poor overall, with many studies hampered by nonrandomized design, presenting normal rather than abnormal anatomy, lack of control groups and long-term follow-up, poor study reporting, lack of evidence of improved simulator performance translating into clinical benefit, and poor reliability and validity evidence. The mean Medical Education Research Study Quality Instrument score of included studies was 9.21 ± 1.95 (± SD) out of a possible score of 18.

Conclusions
The authors demonstrate qualitative and quantitative benefits of a range of neurosurgical simulators but find significant shortfalls in methodology and design. Future studies should seek to improve study design and reporting, and provide long-term follow-up data on simulated and ideally patient outcomes.
Prediction of methylguanine methyltransferase promoter methylation in glioblastoma using dynamic contrast-enhanced magnetic resonance and diffusion tensor imaging
Authors: Ahn Sung Soo , Shin Na-Young , Chang Jong Hee , Kim Se Hoon , Kim Eui Hyun , Kim Dong Wook , Lee Seung-Koo 
Published: June 2014

Object
The methylation status of the methylguanine methyltransferase (MGMT) promoter has been associated with treatment response in glioblastoma. The authors aimed to assess whether MGMT methylation status can be predicted by dynamic contrast-enhanced (DCE) MRI and diffusion tensor imaging (DTI).

Methods
This retrospective study included 43 patients with pathologically diagnosed glioblastoma who had undergone preoperative DCE-MRI and DTI and whose MGMT methylation status was available. The imaging features were qualitatively assessed using conventional MR images. Regions of interest analyses for DCE-MRI permeability parameters (transfer constant [Ktrans], rate transfer coefficient [Kep], and volume fraction of extravascular extracellular space [Ve]) and DTI parameters (apparent diffusion coefficient [ADC] and fractional anisotropy [FA]) were performed on the enhancing solid portion of the glioblastoma. Chi-square or Mann-Whitney tests were used to evaluate relationships between MGMT methylation and imaging parameters. The authors performed receiver operating characteristic curve analysis to find the optimal cutoff value for the presence of MGMT methylation.

Results
MGMT methylation was not significantly associated with any imaging features on conventional MR images. Ktrans values were significantly higher in the MGMT methylated group (median 0.091 vs 0.053 min−1, p = 0.018). However, Kep, Ve, ADC, and FA were not significantly different between the 2 groups. The optimal cutoff value for the presence of MGMT methylation was Ktrans > 0.086 min−1 with an area under the curve of 0.756, a sensitivity of 56.3%, and a specificity of 85.2%.

Conclusions
Ktrans may serve as a potential imaging biomarker to predict MGMT methylation status preoperatively in glioblastoma; however, further investigation with a larger cohort is necessary.
Poor correlation between head circumference and cranial ultrasound findings in premature infants with intraventricular hemorrhage
Authors: Ingram Martha-Conley E. , Huguenard Anna L. , Miller Brandon A. , Chern Joshua J. 
Published: June 2014

Object
Intraventricular hemorrhage (IVH) is the most common cause of hydrocephalus in the pediatric population and is particularly common in preterm infants. The decision to place a ventriculoperitoneal shunt or ventricular access device is based on physical examination findings and radiographic imaging. The authors undertook this study to determine if head circumference (HC) measurements correlated with the Evans ratio (ER) and if changes in ventricular size could be detected by HC measurements.

Methods
All cranial ultrasound (CUS) reports at the authors' institution between 2008 and 2011 were queried for terms related to hydrocephalus and IVH, from which a patient cohort was determined. A review of radiology reports, HC measurements, operative interventions, and significant clinical events was performed for each patient in the study. Additional radiographic measurements, such as an ER, were calculated by the authors. Significance was set at a statistical threshold of p < 0.05 for this study.

Results
One hundred forty-four patients were studied, of which 45 (31%) underwent CSF diversion. The mean gestational age and birth weight did not differ between patients who did and those who did not undergo CSF diversion. The CSF diversion procedures were reserved almost entirely for patients with IVH categorized as Grade III or IV. Both initial ER and HC were significantly larger for patients who underwent CSF diversion. The average ER and HC at presentation were 0.59 and 28.2 cm, respectively, for patients undergoing CSF diversion, and 0.34 and 25.2 cm for those who did not undergo CSF diversion. There was poor correlation between ER and HC measurements regardless of gestational age (r = 0.13). Additionally, increasing HC was not found to correlate with increasing ERs on consecutive CUSs (φ = −0.01, p = 0.90). Patients who underwent CSF diversion after being followed with multiple CUSs (10 of 45 patients) presented with smaller ERs and HC than those who underwent CSF diversion after a single CUS. Just prior to CSF diversion surgery, the patients who received multiple CUSs had ERs, but not HC measurements, that were similar to those in patients who underwent CSF diversion after a single CUS.

Conclusions
The HC measurement does not correlate with the ER or with changes in ER and therefore does not appear to be an adequate surrogate for serial CUSs. In patients who are followed for longer periods of time before CSF shunting procedures, the ER may play a larger role in the decision to proceed with surgery. Clinicians should be aware that the ER and HC are not surrogates for one another and may reflect different pathological processes. Future studies that take into account other physical examination findings and long-term clinical outcomes will aid in developing standardized protocols for evaluating preterm infants for ventriculoperitoneal shunt or ventricular access device placement.