bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asymptomatic Double Aortic Arch Accidentally Diagnosed for a Child with T-Cell Lymphoma - Case Report
Authors: Ioana Hălmaciu , Andrei Suciu Bogdan , Sorin Roşca , Cristina Nagy Bota Monica , Cristian Trâmbiţaş , Klara Brînzaniuc , Adrian Ivănescu 
Published: January 2019

Abstract
Introduction. Double aortic arch (DAA) represents a vascular malformation generated by the persistence of the right dorsal aorta from the intrauterine life. An aortic ring is formed, that surrounds the trachea and esophagus, resulting in difficulty in breathing and swallowing.
Case report. We report the case of a 13 years old male child who was admitted to the pediatric surgery department accusing the presence of a paravertebral subcutaneous lesions. Histopathological result of the excised lesion revealed the presence of peripheral T-cell lymphoma. Examination of computer tomography angiography (Angio-CT) revealed the presence of a complete arterial chain (aortic double arch - DAA) around the trachea and esophagus, without signs of compression.
Most cases are diagnosed in the first year of life, the literature reports a few cases of DAA diagnosed late, to the adolescent or adult. Clinically most of the anatomical variants are usually symptomatic especially that are associated with congenital heart defects, including also Fallot tetralogy.
Conclusions. Angio-CT is a very useful method in diagnosing arterial or venous malformations, symptomatic or asymptomatic.
New faunistic records of Hydroptilidae (Insecta, Trichoptera) from the Czech Republic
Authors: Komzák Petr , Kroča Jiří 
Published: January 2019

Abstract
Two species, Orthotrichia angustella (McLachlan, 1865) and Oxyethira tristella Klapálek, 1895, previously considered to be regionally extinct in the Czech Republic, are reported from the Dyje River (South Moravia) as new records for Moravia. Hydroptila martini Marshall, 1977 and Oxyethira falcata Morton, 1893 endangered species are for the first time recorded from Moravia (incl. Silesia). New faunistic data on rare species Hydroptila occulta (Eaton, 1873) and Hydroptila tineoides Dalman, 1819 are also provided.
Low-frequency ultrasound can drive the transport of nanoparticles and molecules in polymer gels for biotechnology applications
Authors: Martin Donald K. 
Published: January 2019

Abstract
This paper reports the use of low-frequency ultrasound to influence transport in porous hydrogels with a transducer attached in direct contact with the hydrogel. This is a different configuration than for ultrasound-generating devices utilized previously for enhancing transport of molecules. The advantages of the system reported in this manuscript are that (i) much less acoustic power is required to influence the transport in the hydrogel that is in direct contact with the ultrasonic transducer, and (ii) no cavitation is induced in the hydrogel to influence the transport. This system was first tested in bench-top in vitro experiments by quantifying the transport of gold nanoparticles stimulated by low-frequency ultrasound. Then, to provide an in vivo example for potential biotechology applications, the system was demonstrated to be capable of transporting drugs across the tunics of a rabbit eye into the ocular circulation so as to target the transported drug to the outer retina.
Characterization of coniferous forest soils in the arid zone
Authors: Zouidi Mohamed , Borsali Amine Habib , Allam Ayoub , Gros Raphael 
Published: January 2019

Abstract
Arid zones are very harsh environments characterized by binding edaphic and climatic factors, their rainfall is low and irregular accentuated by high temperatures and their soils are fragile and vulnerable. In recent years, it has been noted that vegetation is regressing and that the majority of reforestation has been a failure. Our study aims to know the physico-chemical and microbiological characteristics of forest soils in the pinewoods of an area of the highlands of western Algeria (Naama). For this we analyzed several soil samples spread over five sampling stations in a forest of Aleppo pine. The results show that the forest soils of our study area are characterized by a generally sandy texture and an orange color for all the selected stations. They are characterized by: a very high C/N ratio that indicates a slow evolution of organic matter and a nitrogen deficiency that is necessary for carbon decomposition. The conductivity shows that the soil contains some salinity, its permeability is strong and its humidity fairly low with an alkaline pH (> 8) due to the increase in the limestone level in the area. Basal respiration is low compared to microbial biomass due to poor physico-chemical quality of soils and the effect of water stresses that slow down microbial activities. Soils in this arid forest are generally characterized by soil homogeneity sensitive to the influence of environmental factors mainly poverty into elements necessary for its proper functioning such as nitrogen and water that accentuate soil degradation of these forest formations, which results in the risk of degradation being triggered.
Opportunities to Develop Intercultural Communicative Competence in Czech lower-secondary schools: Findings of the IRSE Video Study of German
Authors: Zerzová Jana 
Published: January 2019

Abstract
The empirical study deals with the topic of teaching intercultural communicative competence (ICC) in Czech lower-secondary German classes. The aim of the study is to investigate the quantity and quality of the opportunities to develop ICC, the proportion of activities aimed at developing the cognitive, affective, and behavioural component of ICC, the proportion of activities focused on Big-C Culture and small-c culture and culture-general and culture-specific topics. The introductory part and the following part of the study introduce its theoretical background, and terminology is then followed by the methodological part describing the sample (28 German lessons of 7 teachers videotaped in the 8th and 9th grades of Czech lower-secondary classes at seven schools in Jihomoravský region within the IRSE Video Study of German1 project), the way of processing the data (recording, transcription, coding), the research questions and a system of categories (a system for assessing teaching ICC), that was used for analyses of the videotaped lessons. The findings show that emphasis is put on the cognitive component of ICC, while the other components (behavioural and affective) stay at the background. These results are consistent with the results of the IRSE Video Study of English project (Zerzová, 2012), which has the potential of initiating discussion for both English and German language teaching methodologies.
Evaluation of mechanical properties of gas pipeline DN 500 after more than 40 years of its operation
Authors: Hagarová M. , Jakubéczyová D. , Baranová G. , Fujda M. 
Published: January 2019

Abstract
The paper deals with the mechanical properties of steel gas pipeline DN 500 after more than 40 years of operation. Mechanical properties of the pipeline were established by a tensile test at an ambient temperature according to the standard EN ISO 6892-1. The resistance of the pipeline against brittle failure was evaluated by using Charpy impact test according to EN 10045-1. The character of fracture surface after the Charpy test was analysed by using scanning electron microscopy. A high proportion of transcrystalline cleavage was a characteristic feature of fracture surfaces. Mechanical characteristics obtained by static tensile testing were compared with the values obtained from steel manufacturer. Higher elongation was observed in a parallel direction compared to the perpendicular direction to the axis of the pipe. The observed anisotropy of properties was related to the distribution of inclusions in the direction of the deformation of the steel sheets used for the pipeline construction.
A groundwater flow model for the Wolin Island area, including glaciotectonic deformation
Authors: Hoc Ryszard , Sadurski Andrzej , Wiśniowski Zenon 
Published: January 2019

Abstract
During the construction of mathematical models for mapping hydrogeological conditions it is necessary to apply simplifications, both in the geological structure and in hydrogeological parameters used. The present note discusses problems surrounding the mapping of glaciotectonic disturbances that occur in the northern part of Wolin Island (northwest Poland). For this part of the island, a direct outflow of groundwater towards the Baltic Sea basin has been determined on the basis of geophysical survey results. An important feature in the hydrogeological conditions here is the isolation of groundwater from both the Baltic Sea and Szczecin Lagoon by clay with a Cretaceous xenolith. Such a geological structure explains the presence of perched water at considerable heights in zones close to the cliffs, without any significant hydraulic connection with surrounding reservoirs. Hydrogeological conditions of Wolin Island have been modelled using the Visual MODFLOW package v.4.2. In the vertical section, these conditions can be simplified to one aquifer (Pleistocene-Holocene), in which two aquifers can be distinguished. In a large part of the island, these remain in mutual hydraulic contact: layer I – upper, with an unconfined aquifer, and layer II – lower, with a confined aquifer, locally an unconfined one. The schematisation of hydrogeological conditions adopted here has allowed to reproduce present groundwater dynamics in the study area.
Groundwater flow modelling of main groundwater reservoirs in the Gdańsk region, Poland
Authors: Kordalski Zbigniew , Sadurski Andrzej 
Published: January 2019

Abstract
During the last nine years, the 133 main groundwater reservoirs in Poland (MGR) have been documented; these were published last year. Some of these are situated in the coastal zone of the southern Baltic Sea. MGR numbers 111 and 112 are in the Gdańsk area and are discussed in the present paper. The study area is situated on the border region of the moraine plateau of the Cashubian Lakeland, the western part of the Vistula River delta plain and the Bay of Gdańsk. The area of the main groundwater reservoir in no. 112 is developed in Quaternary strata and referred to as Żuławy Gdańskie; it comprises predominantly the city of Gdańsk and slightly exceeds 100 km2. There is also a Cretaceous aquifer, rich in groundwater resources, which is named MGR no. 111, beneath the Quaternary reservoir mentioned above. The area studied and modelled totalled 364 km2, on account of the hydraulic connection between these aquifers. Methods of hydrogeological research, groundwater flow simulations, resources calculation are outlined in the present paper.
Relative fixed Internet connection speed experiences as antecedents of customer satisfaction and loyalty: An empirical analysis of consumers in Germany
Authors: Gerpott Torsten J. 
Published: January 2019

Abstract
So far, management practitioners and scholars alike assume that raises in the contractual absolute maximum bandwidth of Internet connections increase the attitudinal bonds of customers with their access provider. The present study broadens this perspective: In a sample of up to 752 German-speaking Internet users with a wireline Internet access at home, it explores two relative speed characteristics of broadband connections as potential determinants of customer affinity with an access provider. The two reference-dependent aspects comprise customer quality experiences in terms of delivered transmission speeds (1) relative to the maximum down- and upload bandwidths as per customer contract, and (2) relative to speeds emphasized in advertisements of a consumer’s access provider. Furthermore, correlations are analyzed between the frequency with which customers use speed tests to check the quality of their wireline Internet connection and their attitudinal bonds with their access provider. Attitudinal bonding is broken down into customer satisfaction with the performance of the current wireline Internet access at home and propensity to churn at the earliest opportunity. Multivariate regression analysis reveals that the impression that advertised wireline access bandwidths are exaggerated compared to the speeds actually delivered and – to a lesser extent – the perception that the contractual maximum speed is reached only in a low share of a customer’s Internet sessions significantly decrease customer satisfaction and significantly increase customer inclination to churn. The effects of the two speed assessments are not independent of one another: Perceived speed exaggerations in a provider’s ads impair customer bonds less (more) strongly if the experienced share of Internet sessions with speeds below the contractual maximum bandwidth is high (low). More frequent speed testing reduces customer bonding, especially in case that advertised speeds of a customer’s provider are experienced as overblown. The results suggest that wireline Internet access providers can increase the attitudinal bonds with their customers by abstaining from emphasizing maximum speeds in their advertising, which customers rarely reach under standard everyday conditions.
The impact of Digital Platforms on Business Models: an empirical investigation on innovative start-ups
Authors: Ruggieri Roberto , Savastano Marco , Scalingi Alessandra , Bala Dorina , D’Ascenzo Fabrizio 
Published: January 2019

Abstract
Digital platforms have the ability to connect people, organizations and resources with the aim of facilitating the core interactions between businesses and consumers as well as assuring a greater efficiency for the business management. New business concepts, such as innovative start-ups, are therefore created based on innovation, scalability and the relationships within the community around them. The purpose of this work is to deeply understand the evolution of business models brought by innovative and dynamic companies operating through online platforms. In order to achieve the objectives set, an exploratory multiple-case study was designed based on in-depth structured interviews. The aim was to conduct a mixed analysis, in order to rely both on qualitative and quantitative data. The structured interview protocol was therefore designed to collect and then analyse data concerning the company profile and managers’ perspectives on the phenomenon of interest. The interview protocol was submitted in advance and then face-to-face interviews were carried out with the following professional figures: Chief Executive Officer (CEO), General Manager, Chief Technology Officer (CTO), Marketing Manager and Developers. Collected data were analysed and processed through the Canvas Business Model in order to clearly outline similarities and differences among the sample. Results can be considered under two viewpoints. On the one hand, this work provides a detailed overview of the companies interviewed, according to the dimensions of: reference market dynamics, type and number of customers, scalability. On the other one, they allow to identify some success patterns regarding key activities, key resources, channel mix strategy, costs management, value proposition, customer segmentation, key partners and the way to obtain revenues. Results from the multiple-case study with 15 Italian start-ups provide interesting insights by comparing the innovative business models developed and highlighting key differences and similarities. Overall, the start-ups analyzed, operating in several sectors, showed great growth prospects and the possibility to create value for their customers through innovative products and services offered through digital platforms.
Rethinking the state-market relations in the New Age of development
Authors: Dobrescu Paul , Durach Flavia 
Published: January 2019

Abstract
This paper discusses, from a conceptual and theoretical perspective, the recent debates on the relation between the state and the market as drivers of national development. Since the end of the Cold War, three periods are distinguishable according to the way in which development is discussed, envisaged, and designed through state policies. The first one starts from the end of the Cold War and leads to the 2008-2009 crisis, the second includes the ten years of recovery, while the last is unfolding at the moment. The argument takes globalization into account as the background for development, during the three decades observed. The paper analyses the way in which the state-market relationship was envisaged during each period, both in the developed and emerging economies. The paper identifies the factors that ensure steady development, with an emphasis on current challenges. Lastly, the paper presents the particular experience of Central and Eastern Europe during its transition from the communist regime to democracy. The conclusion is that the better understanding of the relationship between globalization and development, the faster their evolution for a given country.
Stochastic Differential Equations Describing Systems with Coloured Noise
Authors: Kolářová Edita , Brančík Lubomír 
Published: January 2019

Abstract
In this paper we deal with stochastic differential equations, that describe systems effected by coloured noise. In electrical systems this can be the case, when e.g. transmission line is modelled by means of proper higher-order ladder network. We define the mathematical representation of the coloured noise as a solution of the Langevin equation and formulate the corresponding Itô type stochastic differential equation. Applying this theory we derive the stochastic model of the network and find sets of individual stochastic trajectories numerically via a stochastic version of the backward Euler scheme. Afterwards respective confi-dence intervals are computed statistically while utilizing Student’s t distribution. The theoretical results are illustrated by an example of a higher-order ladder network. Numerical simulations in the example are carried out using Matlab.
Control of Conservation Laws – An Application
Authors: Răsvan Vladimir 
Published: January 2019

Abstract
We present here three types of controlled boundary value problems for conservation laws arising from energy co-generation, hydraulic flows and water hammer for hydroelectric power plants and control of the open channel flows (shallow water). The novelty of these models, from the mathematical point of view, is that they are described by nonlinear hyperbolic partial differential equations of the conservation laws with (possibly) nonlinear boundary conditions. At their turn these boundary conditions are controlled by some systems of ordinary differential equations. The engineering requirements for such systems are asymptotic stability and disturbance rejection: these properties have to be achieved by feedback control. In our setting the main tool for tackling these problems is a suitable Lyapunov functional arising from the energy identity. The hints for “guessing” this functional are to be found in the linearized version of the aforementioned mathematical objects.
Discrepancy Results for The Van Der Corput Sequence
Authors: Spiegelhofer Lukas 
Published: January 2019

Abstract
Let dN
= NDN
(ω) be the discrepancy of the van der Corput sequence in base 2. We improve on the known bounds for the number of indices N such that dN ≤ log N/100. Moreover, we show that the summatory function of dN
satisfies an exact formula involving a 1-periodic, continuous function. Finally, we give a new proof of the fact that dN
is invariant under digit reversal in base 2.
Jenis - Jenis Mamalia Di Koto Baru Nagari Paninggahan Kabupaten Solok Sumatera Barat
Authors: Rahma Fikriya - , Novarino Wilson - , Rizaldi Rizaldi - 
Published: January 2019

An inventory of mammalian species from Koto Baru Paninggahan Solok West Sumatera was conducted from August to October and continued from November to December 2015. The animals were identified through photographes from camera traps, personal encounters as well as indirect observations including foot prints and interviews to local inhabitants. This study has documented 15 species of mammals which belong to 11 families and 6 orders. From a total 511 identified photograps, it was known that pig-tailed macaque (Macaca nemestrina) was the most frequently photographed (212 images) and sambar deer (Rusa unicolor) was the least frequently photographed (3 images).
Analisis Kebutuhan Personel Air Traffic Controller (ATC) Di Pusat Pengendalian Lalu Lintas Penerbangan Makassar
Authors: Susanti Susanti 
Published: January 2019

Peristiwa kecelakaan Sukhoi Super Jet 100 pemah menyisakan praduga atas peranan ATC yang salah dalam memberikan panduan lalu lintas penerbangan. Tanggung jawab A TC memang memegang peranan penting dalam menjaga keselamatan penerbangan. Jumlah ATC yang jauh dari kondisi ideal sering mengemuka menjadi salah satu penyebab dari kondisi kerja mereka yang turut mempengaruhi keselamatan penerbangan. Dalam upaya mengetahui kondisi kerja ATC yang meliputi tingkat kelelahan, kondisi jam kerja, serta kebutuhan minimal jumlah personel ATC di lapangan diperlukan penelitian akan hal tersebut. Analisis tingkat kelelahan dilakukan dengan metode paired sample T-test, sedangkan untuk mengetahui jumlah minimal ATC digunakan pedoman ICAO Doc. 9426AN /924 First Edition Advisory Circular (AC 69-01). Kesimpulan penelitian adalah adanya tingkat kelelahan yang signifikan meliputi faktor fisik dan psikologis petugas ATC di Makassar, serta jumlah A TC masih jauh dari kondisi minimal yang dipersyaratkan sesuai aturan ICAO.
Influência da técnica de alta frequência no processo cicatricial da micropigmentação de sobrancelhas: revisão de literatura
Authors: Silva Maísa da , Cândido Juliana Oliveira Martins , Lima Larissa Pereira 
Published: January 2019

Objetivo: Avaliar o processo de aceleração cicatricial, com o uso da técnica de alta frequência, após o procedimento de micropigmentação nas sobrancelhas. Metodologia: Os métodos empregados nesta pesquisa baseiam-se em pesquisas bibliográficas. Foram utilizados artigos das bases de dados Scielo, Lilacs, PubMed e MedLine, com os descritores Sobrancelhas, Cicatrização e Tatuagem, no período de agosto a novembro de 2018. Os critérios na escolha dos artigos foram apenas que representasse relação com o tema proposto, artigos na língua portuguesa e inglesa e artigos clínicos e experimentais. Resultados: Através desta revisão de literatura exploratória qualitativa, com base em 4 artigos, pode-se observar que a técnica da alta frequência é amplamente eficiente, podendo trazer grandes resultados em diversas disfunções. Conclusão: Obteve-se com a presente revisão de literatura a análise esperada, a alta frequência apresentou efeitos benéficos no processo cicatricial nas lesões causadas pela micropigmentação de sobrancelhas. Em virtude do baixo número de pesquisas sobre o uso clínico da alta frequência na técnica de micropigmentação, sugerem-se novas pesquisas.