bluuebunny/crossref_metadata_2025_split huggingface dataset:
Intrahepatic mass-forming cholangiocarcinoma and solitary hypovascular liver metastases: is the differential diagnosis using diffusion-weighted MRI possible?
Authors: Kovač Jelena Djokić , Galun Danijel , Đurić-Stefanović Aleksandra , Lilić Gordana , Vasin Dragan , Lazić Ljubica , Mašulović Dragan , Šaranović Đorđije 
Published: March 2017

Background Intrahepatic mass-forming cholangiocellular carcinoma (IMC) is the second most common primary liver tumor. The differentiation between IMC and solitary hypovascular liver metastases (SHLM) represents a diagnostic challenge due to many overlapping magnetic resonance imaging (MRI) features. Purpose To determine the value of diffusion-weighted imaging (DWI) in addition to conventional MRI for the distinction between intrahepatic mass-forming cholangiocarcinoma and solitary hypovascular liver metastases. Material and Methods Fifty-three patients with pathologically proven IMC (n = 31) and SHLM (n = 22) who had undergone MRI and DWI before surgery or percutaneous biopsy were enrolled in this study. The following MRI features were analyzed: the size and shape of the lesion, presence of capsular retraction and segmental biliary dilatation, T2-weighted (T2W) signal intensity, the presence of target sign on DWI and enhancement pattern. Apparent diffusion coefficient (ADC) values were calculated for each lesion ( b = 800 s/mm2). Univariate and multivariate logistic regression analyses were used to identify significant differentiating features between IMCs and SHLMs. Results Univariate analysis revealed that following parameters favor diagnosis of IMCs over SHLMs: lobulating shape, heterogeneous T2W signal intensity, capsular retraction, segmental biliary dilatation, target sign on DWI and rim-like enhancement on arterial phase followed by progressive enhancement in delayed phases. ADC values measured in the periphery of the lesion were significantly lower in IMCs in comparison to SHLMs. Multivariate analysis revealed that target sign on DWI was the most significant predictor of IMCs. Conclusion Qualitative DWI analysis with target sign significantly improves diagnostic accuracy for differentiation among IMC and SHLM lesions.
Inconsistencies in the Diagnosis of Aggressive Posterior Retinopathy of Prematurity
Authors: Patel Samir N. , Singh Ranjodh , Jonas Karyn E. , Ostmo Susan , Petrakos Paul , Gupta Mrinali P. , Campbell J. Peter , Chiang Michael F. , Chan R. V. Paul 
Published: March 2017

Purpose: To determine the accuracy and reliability of diagnosing aggressive posterior retinopathy of prematurity (AP-ROP). Methods: A total of 1220 eye examinations from 230 infants were prospectively obtained at 8 major ROP centers. An ophthalmologist at each center provided a clinical diagnosis using indirect ophthalmoscopy. Wide-angle retinal images were then obtained, which were independently read by 2 ROP experts using a web-based system for an image-based diagnosis. Sensitivity and specificity of image-based AP-ROP diagnosis by the ROP experts were calculated using the clinical diagnosis as the reference standard. Agreement of AP-ROP diagnosis through image-based diagnosis and clinical diagnosis was calculated using the unweighted κ statistic. Results: One hundred four (9%) of the 1220 examinations had a clinical diagnosis of AP-ROP. Sensitivity and specificity for the presence of AP-ROP were 35% and 96% for expert 1 and 17% and 99% for expert 2. Using the κ statistic, expert image-based versus clinical diagnostic agreement for the diagnosis of AP-ROP was 0.34 (fair) for expert 1 and 0.24 (fair) for expert 2. Agreement for the diagnosis of AP-ROP between the image-based diagnoses of expert 1 and expert 2 was 0.49 (moderate). Conclusion: There are inconsistencies between the clinical diagnosis of AP-ROP (as determined by indirect ophthalmoscopy) and the image-based diagnosis of AP-ROP. This may have important implications for ROP management and the current international ROP classification system.
Single-crystal X-ray diffraction, EMPA, FTIR and X-ray photoelectron spectroscopy study of narsarsukite from Murun Massif, Russia
Authors: Schingaro E. , Mesto E. , Lacalamita M. , Scordari F. , Kaneva E. , Vladykin F. N. 
Published: March 2017

AbstractA crystal chemical study of narsarsukite from the Murun alkaline massif, Russia has been carried out combining single-crystal X-ray diffraction, electron microprobe analyses, micro-Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). The narsarsukite single crystals are tetragonal (space group I4/m) with unit-cell parameters: 10.7140(1) ≤ a ≤ 10.7183(2) Å and 7.9478(1) ≤ c ≤ 7.9511(1) Å. The XPS analysis showed that Fe occurs in the mineral as Fe3+, whereas the FTIR spectrum showed that the sample studied is anhydrous. The average crystal chemical formula of the Murun narsarsukite is: Na2.04K0.01(V0.015+Ti0.74Zr0.01Al0.01Fe0.223+Mg0.01)1.00Si4.00(O10.74F0.23OH0.03)11.00. Structural disorder at octahedral and interstitial sites was modelled and also discussed in consideration of the main substitutional mechanism Ti4+ + O2– ↔ Fe3+ + (F–, OH–) active in the structure of the mineral.
Inhibition of WNT signaling in the bone marrow niche prevents the development of MDS in the Apcdel/+ MDS mouse model
Authors: Stoddart Angela , Wang Jianghong , Hu Chunmei , Fernald Anthony A. , Davis Elizabeth M. , Cheng Jason X. , Le Beau Michelle M. 
Published: March 2017

Key PointsLoss of 1 copy of Ctnnb1 (encoding β-catenin) in an Apc-haploinsufficient microenvironment prevents the development of MDS. Modulation of WNT signaling in the niche using pyrvinium inhibits the development of MDS in Apc-haploinsufficient mice.
Single-Particle Tracking Reveals a Dynamic Role of Actin Filaments in Assisting Long-Range Axonal Transport in Neurons
Authors: Osakada Yasuko , Zhang Kai 
Published: March 2017

Abstract
Here, we demonstrated that actin filaments mediate axonal transport in dorsal root ganglia (DRG) neurons using fluorescence single-particle tracking. We employed a compartmentalized microfluidic cell culturing chamber that allows depolymerization of actin filaments within an axonal segment. We observed that local actin depolymerization results in a two-fold increase in the average pausing duration, whereas the microtubule-dependent instantaneous transport speed is not perturbed. Collectively, our data reveal an important role of actin filaments in assisting microtubule-dependent long-range NGF axonal transport in DRG neurons.
Ação antrópica e risco de ravinamento: o exemplo da ravina do Corgo (rio Alva)
Authors: Martins Bruno , Lourenço Luciano , Lima Hudson Rodrigues 
Published: March 2017

A partir do estudo da ravina do Corgo, localizada na margem direita do rio Alva, a jusante da povoação de Penalva de Alva e em frente à das Caldas de São Paulo, no concelho de Oliveira do Hospital (Centro de Portugal), procuram-se analisar os principais factores que estiveram na sua génese e, desta forma, contribuir para o conhecimento de um dos processos erosivos que mais concorrem para a evolução das vertentes, como é o caso dos ravinamentos. https://doi.org/10.14195/1647-7723_24_16
Cambios de uso y erosión de suelos: análisis diacrónico (1960-2012) mediante SIG en la cuenca del Guiniguada (Gran Canaria, Islas Canarias, España)
Authors: Romero Martín Lidia Esther , García Romero Leví , Hernández Cordero Antonio , Pérez-Chacón Espino Emma 
Published: March 2017

Se analiza la evolución de las tasas de erosión tras los cambios de usos del suelo producidos entre 1960 y 2012. Para ello se adapta el modelo empírico USLE a las especificidades de Gran Canaria, y se implementa mediante un SIG. Los resultados muestran que la eficacia antierosiva y la calidad paisajística, de las superficies abancaladas de la cuenca, se han visto desigualmente afectadas por el incremento de las tasas de erosión. https://doi.org/10.14195/1647-7723_24_5
Communal Identity Transformation in Soqotra: From Status Hierarchy to Ethnic Ranking
Authors: Elie Serge D. 
Published: March 2017

Abstract
This article examines the transformation of communal identities and social hierarchies on Soqotra Island. This is done through a “structural anatomy” of Soqotra’s changing social organization and a “lexical genealogy” of the collective identities ascribed to, or assumed by, Soqotrans in response to the polity formation strategies of a succession of British and Yemeni political regimes from the late nineteenth century until the present. Following a brief historical and theoretical introduction, Part I outlines the status stratification system that prevailed only a generation ago in the form of an ascriptive hierarchy based on ethno-occupational specializations and territorial segmentation linked to distinct ecological habitats, which continues to mediate the integration of Soqotrans into the emergent modern social formation. Part II describes how communal identities over the past generation have been leveraged by various national and transregional political and cultural forces, leading to an emerging hierarchy of ethnicity-based identities. The concluding section updates the current status of Soqotra’s traditional social groups and highlights the dynamic relationality between communal identity transformation and political and historical contingencies.
The Political Thought of Mawdudi as a Template for Democratic Sustainability in Nigeria
Authors: Adebayo Rafiu Ibrahim 
Published: March 2017

The inseparability of religion and politics is demonstrated in the involvement of prominent ulama (religious scholars) in politics directly or indirectly. Being an important stakeholder in politics, such scholars have been raising their voices on political matters and influencing political decisions in their respective countries. In some cases, such religious scholars performed oppositional role with a view to forcing the ruling government to check their actions which were contradictory to the dictate of their religion. The Islamic revolution in Iran is a living testimony to the fact that religious scholars are relevant to effect new sociological and religio-political paradigms for their countries. It is on this basis that this paper shall explore the political thought of a seasoned reforming Mogul whose thought is significant to democratic sustenance in Nigeria, Maulana Abul A’la Mawdudi (1903 -1979). This sage enunciated some political principles which if strictly studied and adhered to, will help in no small measure in ensuring sustainable democratic governance whose leadership will not regret leading its people and the populace will not eventually curse such a leader. [Agama dan politik dalam banyak hal tidak dapat dipisahkan. Hal ini ditunjukkan antara lain oleh keterlibatan ulama dalam politik, langsung atau tidak. Menjadi bagian dari sistem politik, ulama dapat menyuarakan pandangan mereka dan mempengaruhi keputusan politik di negara masing-masing. Dalam beberapa kasus, para ulama juga melakukan oposisi untuk memaksa pemerintah melihat kebijakan yang bertentangan dengan ajaran agama. Revolusi Islam di Iran adalah contoh nyata dengan fakta bahwa ulama memiliki peran yang erat terkait dengan paradigma sosiologis dan religio-politik baru bagi negara. Makalah ini akan mengeksplorasi pandangan Maulana Abul A’la Maududi (1903 -1979), tokoh reformist yang pemikirannya sangat penting untuk pengembangan demokrasi di Nigeria. Beberapa prinsip politik akan membantu dalam memastikan pemerintahan yang demokratis berkelanjutan, jika dipelajari dan diikuti dengan benar.]
Ein Fischlein mit Lästermaul Ibrāhīm al-Miʿmārs liebster Feind, Aḥmad b. Ismāʿīl as-Sumayka
Authors: Özkan Hakan 
Published: March 2017

Abstract:
The poet known by the moniker Sumayka (“little fish”) is arguably one of the most bad-mouthed poets of the eighth/fifteenth century. At least this is the impression one gets when reading the zajal and several epigrams about him by Ibrāhīm al-Miʿmār, the distinguished zajjāl and author of epigrams from Cairo. As his foe Sumayka, al-Miʿmār died in the plague of 749/1348. This paper introduces Sumayka as a minor poet of the Mamluk times who made his way into some bio-bibliographies and historiographic works of his time and got famous especially for his defamatory verses. It includes his complete works of which there are only a few and all the poems that Ibrāhīm al-Miʿmār, his favorite enemy, wrote on or rather against him.
Auf der Suche nach einer verlorenen Zeit? – Visuelle Perspektiven der Kindheit in Mittelasien vor 1917
Authors: Sidikov Bakhodir 
Published: March 2017

Abstract
The following article argues that vintage postcard photographies from Russian Central Asia before 1917 could be read as “conventional” historical sources. The way that provides access to their historical contents beyond the photographers’ intentions and no matter how staged the photographies were could be the praxeology, i. e. the conception that vintage postcards images are a manifestation of both local and central social practices in the Central Asian region under Russian rule. Using the example of the debate on childhood in traditional society initiated by French historian Philippe Ariès in his book The Child and Family Life in the Old Régime (1960) the author discusses theoretical and methodological approaches to his topic based on the praxeology.
Transfer Equation in General Curvilinear Coordinates
Authors: Freimanis J. 
Published: March 2017

Abstract
The differential operator of the monochromatic polarized radiative transfer equation is studied in case of statistically homogeneous turbid medium in Euclidean three-dimensional space, with arbitrary curvilinear coordinate system defined in it. An apparent rotation of the polarization plane along the light ray with respect to the chosen polarization reference plane generally takes place, due to purely geometric reasons. Using methods of tensor analysis, analytic expressions for the differential operator of the transfer equation depending on the components of the metric tensor and their derivatives are found. Considerable simplifications take place if the coordinate system is orthogonal. As an example, the differential operator of the vector radiative transfer equation in both elliptical conical coordinate system and oblate spheroidal coordinate system is written down. Nonstandard parameterization of standard elliptical conical coordinate system is proposed.
Some Studies of Terrestrial Impact Cratering Rate
Authors: Jetsu L. 
Published: March 2017

Abstract
In 1984, a 28.4 Myr periodicity was detected in the ages of terrestrial impact craters and a 26 Myr periodicity in the epochs of mass extinctions of species. Periodic comet showers from the Oort cloud seemed to cause catastrophic events linked to mass extinctions of species. Our first study revealed that the only significant detected periodicity is the “human signal” caused by the rounding of these data into integer numbers. The second study confirmed that the original 28.4 Myr periodicity detection was not significant. The third study revealed that the quality and the quantity of the currently available data would allow detection of real periodicity only if all impacts have been periodic, which cannot be the case. The detection of a periodic signal, if present, requires that more craters should be discovered and the accuracy of age estimates improved. If we sometimes will be able to find the difference between the craters caused by asteroid and comet impacts, the aperiodic component could be removed. The lunar impact craters may eventually provide the required supplementary data.
Microlensing-Based Studies of the Unresolved Structure of AGNs and the Composition of Lensing Galaxies
Authors: Gradolph Teresa Mediavilla , Gradolph Evencio Mediavilla , Muñoz Jose Antonio 
Published: March 2017

AbstractMultiple images of quasars formed by gravitational lensing are typically seen through the lensing galaxy. The granulation of the galaxy in stars or other compact objects induces local (‘microscopic’) but strong fluctuations in the gravitational potential that subdivide each image in several micro-images changing the expected flux of the image (flux anomalies). This phenomenon, quasar microlensing, allows to study both the unresolved structure of the source and the composition of the lensing galaxy. We have applied a statistical analysis based on caustic crossing to the multiply imaged quasar QSO B2237+0305. The results indicate that the abundance of low-mass stars in the distribution of microlenses could be estimated with 10 years of monitoring.
Influence of Black Hole Spin on the Shape of the Fe Kα Spectral Line: The Case of 3C 405
Authors: Jovanović P. , Jovanović V. Borka , Borka D. 
Published: March 2017

AbstractHere we analyze how the angular momenta (spins) of black holes in the centers of Active Galactic Nuclei (AGN) affect the shape of the FeK line emitted from their accretion disks. For that purpose, we compared the observed line profile in the case of radio galaxy 3C 405 (Cygnus A) with its profiles, obtained by numerical simulations based on ray-tracing method in the Kerr metric. Our results show that the spins of rotating central black holes of AGN have significant influence on their FeKα line shapes. Also, we found that in the case of Cygnus A the observed line is probably emitted from the innermost region of its slightly inclined accretion disk around very slowly rotating or even stationary central black hole.
Influence of Microlensing on Spectral Anomalies of the Lensed Objects
Authors: Simić S. , Popović L. Č. , Jovanović P. 
Published: March 2017

AbstractHere we consider the influence of microlensing on the spectrum of a lensed object with the angular size 5 μas accepting that the composite emission of this object originates from three different regions arranged around its center. We assume that the lensed object has three concentric regions with a black-body emission; the temperatures of these regions are 10 000 K, 7500 K and 5000 K. We investigate how the integral spectral energy distribution (SED) of such stratified source changes due to microlensing by a group of solarmass stars. We find that the SED and flux ratios in the photometric B, V and R passbands show considerable changes during a microlens event. This indicates that the flux anomaly observed in some lensed quasars may be caused by microlensing of a stratified object.
A Statistical Study of the Si IV Resonance Line Parameters in 19 Be Stars
Authors: Antoniou A. , Danezis E. , Lyratzi E. , Stathopoulos D. , Dimitrijević M. S. 
Published: March 2017

Abstract
Using the GR model, we analyze the ultraviolet Si IV resonance lines in the spectra of 19 Be stars of different spectral subtypes, in order to detect the presence of absorption components and to analyze their characteristics. From this analysis we can calculate the values of a group of physical parameters, such as the apparent rotational and radial velocities, the random velocities of the ion thermal motions, as well as the absorbed energy and the logarithm of the column density of the independent regions of matter which produce the main and the satellite components of the studied spectral lines.
Analysis of Hydrogen Cyanide Hyperfine Spectral Components towards Star Forming Cores
Authors: Loughnane R. M. , Redman M. P. , Keto E. R. , Lo N. , Cunningham M. R. 
Published: March 2017

Abstract
Although hydrogen cyanide has become quite a common molecular tracing species for a variety of astrophysical sources, it, however, exhibits dramatic non-LTE behaviour in its hyperfine line structure. Individual hyperfine components can be strongly boosted or suppressed. If these so-called hyperfine line anomalies are present in the HCN rotational spectra towards low or high mass cores, this will affect the interpretation of various physical properties such as the line opacity and excitation temperature in the case of low mass objects and infall velocities in the case of their higher mass counterparts. Anomalous line ratios are present either through the relative strengths of neighboring hyperfine lines or through the varying widths of hyperfine lines belonging to a particular rotational line. This work involves the first observational investigation of these anomalies in two HCN rotational transitions, J=1→0 and J=3→2, towards both low mass starless cores and high mass protostellar objects. The degree of anomaly in these two rotational transitions is considered by computing the ratios of neighboring hyperfine lines in individual spectra. Results indicate some degree of anomaly is present in all cores considered in our survey, the most likely cause being line overlap effects among hyperfine components in higher rotational transitions.
Studying the UV Mg II Resonance Lines in 20 Be Stars
Authors: Antoniou A. , Stathopoulos D. , Danezis E. , Lyratzi E. 
Published: March 2017

Abstract
Using the GR model, we analyze the UV Mg II resonance lines in the spectra of 20 Be stars of different spectral subtypes, in order to detect the presence of satellite or discrete absorption components. The values of some physical parameters – rotational, radial and random velocities, as well as the FWHM and the absorbed energy, as a function of the effective temperature for the studied stars are determined.
Characterizing the Photometric Response of the ANS Collaboration Monitoring Program
Authors: Munari U. , Moretti S. 
Published: March 2017

Abstract
the ANS Collaboration uses the UBV RCIC filters from various commercial manufacturers (Omega Optical, Custom Scientific, Schuler, Optec, Astrodon) for its ongoing photometric monitoring of symbiotic stars. We measured their transmittance profiles over the range 2000 Å to 1.1 μm for various operating conditions, and we are monitoring their evolution over time. Their field performance in terms of color equations has been evaluated by analyzing the transformations from local to standard system of the 14602 observing runs so far collected on symbiotic stars with the ANS Collaboration telescopes. Ageing effects, red leaks and transmittance vs. angle of incidence are also evaluated.
An Extremely Massive White Dwarf of the Symbiotic Classical Nova V407 Cyg as Suggested by the RS Oph and U SCO Models
Authors: Hachisu I. , Kato M. 
Published: March 2017

Abstract
We have analyzed the optical light curve of the symbiotic star V407 Cyg that underwent a classical nova outburst in 2010 March. Being guided by a supersoft X-ray phase observed during days 20-40 after the nova outburst, we are able to reproduce the light curve during a very early phase of the nova outburst. Our model consists of an outbursting white dwarf and an extended equatorial disk. An extremely massive white dwarf of 1.35-1.37 M⊙ is suggested. the optical light curve is also consistent with a sharp drop 47 days after the outburst, which is the end of hydrogen shell-burning on the white dwarf. Although the extremely massive white dwarf is favourable to the interpretation that V407 Cyg is a recurrent nova, enrichment of heavy elements in the ejecta suggests that the white dwarf is eroded and, as a result, its mass is not increasing. Therefore, V407 Cyg may not explode as a Type Ia supernova even if it is a carbon-oxygen white dwarf.
Mass Transfer in Mira-Type Binaries
Authors: Mohamed S. , Podsiadlowski Ph. 
Published: March 2017

Abstract
Detached, symbiotic binaries are generally assumed to interact via Bondi-Hoyle-Littleton (BHL) wind accretion. However, the accretion rates and outflow geometries that result from this mass-transfer mechanism cannot adequately explain the observations of the nearest and best studied symbiotic binary, Mira, or the formation of some post-AGB binaries, e.g. barium stars. We propose a new mass-transfer mode for Mira-type binaries, which we call ‘wind Roche-lobe overflow’ (WRLOF), and which we demonstrate with 3D hydrodynamic simulations. Importantly, we show that the circumstellar outflows which result from WRLOF tend to be highly aspherical and strongly focused towards the binary orbital plane. Furthermore, the subsequent mass-transfer rates are at least an order of magnitude greater than the analogous BHL values. We discuss the implications of these results for the shaping of bipolar (proto)-planetary nebulae and other related systems.