bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical Spectroscopy with the Technology of Virtual Observatory
Authors: Škoda P. 
Published: March 2017

Abstract
The contemporary astronomy is flooded with an exponentially growing petabyte-scaled data volumes produced by powerful ground and space-based instrumentation as well as a product of extensive computer simulations and computations of complex numerical models. The efficient organization and seamless handling of this information avalanche stored in a world-wide spread heterogeneous databases and the facilitation of extraction of new physical knowledge about the Universe is a primary goal of the rapidly evolving astronomical Virtual Observatory (VO). We give an overview of current spectroscopic capabilities of VO and identify the future requirements indispensable for detailed multi-wavelength analysis of huge amounts of spectra in a semi-automatic manner.
On the Gas Temperature Determination from Van Der Waals Broadening in Argon - Neon Microwave Plasmas
Authors: Muñoz José , Dimitrijević Milan S. , Calzada M. D. 
Published: March 2017

Abstract
Recently we proposed a method to determine the gas temperature using the van der Waals broadening of atomic spectral lines for atmospheric pressure Ar-He plasma. Here our investigations are continued by studying the influence of Ar*-Ne interactions in order to enlarge the applicability of the proposed method for the determination of gas temperature in argon - neon mixtures. The Ar I 425.9 nm line is found to be suitable for the gas temperature determination.
The ANS Collaboration Monitoring Program
Authors: Munari U. , Bacci S. , Baldinelli L. , Castellani F. , Cetrulo G. , Cherini G. , Dallaporta S. , Dallavia G. , Englaro A. , Frigo A. , Graziani M. , Luppi V. , Maitan A. , Marangoni C. , Milani A. , Moretti S. , Moschini F. , Ochner P. , Siviero A. , Righetti G. L. , Tomaselli S. , Tomasoni S. , Vagnozzi A. , Valisa P. 
Published: March 2017

Abstract
ANS Collaboration is a growing Italian network of small and medium size telescopes performing spectroscopy (low and medium resolution single dispersion, and Echelle high resolution modes) and UBV RCIC CCD photometry of symbiotic stars and novae mainly, but with interest also on other types of objects like optical transients, eclipsing binaries, X-ray source counterparts and on-call follow-up observations of selected targets from some surveys like IPHAS or RAVE. In the present form ANS started operations in 2005, and at the time of writing has logged on symbiotic stars 14602 photometric runs and a rich ensemble of low and high resolution, absolutely fluxed spectra. the paper describes the internal organization, operation modes and procedures, and presents sample data and performance statistics.
New Symbiotic Stars Monitored with the Hermes Spectrograph: A Case Study of Orbital Hα Modulation
Authors: Jorissen Alain , Van Eck S. , Dermine T. , Van Winckel H. , Gorlova N. 
Published: March 2017

Abstract
We present new orbital elements for two symbiotic systems involving a giant of spectral type S, namely V420 Hya and ER Del. These orbital elements are compared with existing elements for S-type binaries and for symbiotic binaries with M-giant primaries. It is shown that among the S-type binaries, most of the short-period systems (with P in the range 300 - 1000 d) exhibit some kind of symbiotic activity (Hα emission, UV continuum, hard X-rays), but symbiotic systems are not restricted to the short-period systems. the complex and varying Hα profile of V420 Hya has been decomposed to several components (broad emission with σ ~ 140 km/s, narrow emission with σ ~ 60 km/s, and narrow absorption components). Their orbital modulation reveals that the broad emission is located close to the companion (under the hypothesis of a system with a mass ratio Mg/Mc = 2), and that this broad emission is mutilated by absorption from matter located along the line of sight and flowing towards the observer (faster than the giant) at all orbital phases.
Spectroscopic Monotoring of the Symbiotic Star BX Monocerotis
Authors: Anupama G. C. , Kamath U. S. , Gurugubelli U. K. , Mikołajewska J. 
Published: March 2017

Abstract
Low resolution optical spectra of the symbiotic star BX Monocerotis in the 3500-9000 Å range obtained during 1999–2010 are described. the spectrum of BX Mon at all phases is dominated by the cool component, with a red continuum and TiO absorption. Emission lines, predominantly due to HI, He I, He II, Fe II, Ca II and [O III] are seen superimposed on the spectrum of the M5III star, with variable intensities. the observed variations in the spectra seem to be correlated with the orbital phases.
SBS 0802+529: A New Variable Star from the Second Byurakan Survey
Authors: Chavushyan V. , Erastova L. , Tovmassian G. , Torrealba J. , Valdez J. R. 
Published: March 2017

Abstract
A new emission line star was discovered on the plates of the Second Byurakan Survey (SBS). the follow up spectroscopy demonstrated that the object had a spectrum dominated by a late-type giant star with superposed hydrogen emission lines. the object resembles a pulsating Mira, but the amplitude of variability and a rapid UV variability are quite unusual for a single star, and we tentatively classify the object as a symbiotic star.
Science with the VO: Spectroscopic Studies of Herbig Ae/Be Stars
Authors: Baines D. , Gonzalez J. , Arviset C. , Barbarisi I. , Laruelo A. , Leon I. , Landaluce I. Ortiz de , Osuna P. , Rios C. , Salgado J. 
Published: March 2017

AbstractThe Virtual Observatory (VO) is opening up new ways of exploiting the huge amount of data provided by the ever growing number of ground-based and space facilities. Using VOSpec, a multi-wavelength spectral analysis tool developed by the ESA-VO Team at ESAC, and new developments on scripting with VOSpec (VOScript), we have started to undertake a comprehensive study of spectroscopic and photometric data in the VO on Herbig Ae/Be stars. By studying line strengths, variabilities and spectral energy distributions, from the X-ray to sub-millimeter ranges, we aim to gain insights into processes and disk properties of a large sample of these objects. This paper presents initial findings of the spectroscopic analysis and initial spectral energy distribution classifications.
The Lower Main Sequence of Stars in the Solar Neighborhood: Model Predictions Versus Observation
Authors: Bartašiūtė S. , Deveikis V. , Raudeliūnas S. , Sperauskas J. 
Published: March 2017

Abstract
We have used the Simbad database and VizieR catalogue access tools to construct the observational color-absolute magnitude diagrams of nearby K-M dwarfs with precise Hipparcos parallaxes (σπ/π ≤ 0:05). Particular attention has been paid to removing unresolved double/multiple stars and variables. In addition to archival data, we have made use of nearly 2000 new radial-velocity measurements of K-M dwarfs to identify spectroscopic binary candidates. The main sequences, cleaned from unresolved binaries, variable stars, and old population stars which can also widen the sequence due to their presumably lower metallicity, were compared to available solar-metallicity models. Significant offsets of most of the model main-sequence lines are seen with respect to observational data, especially for the lower-mass stars. Only the location and slope of the Victoria-Regina and, partly, BaSTI isochrones match the data quite well.
Chemical Composition of a Young Star HD 377
Authors: Kipper Tõnu 
Published: March 2017

AbstractA high resolution spectrum of a pre-main sequence star HD 377 is analyzed. The atmospheric parameters are found to be: Teff=5875 K, log g = 4.25 and the microturbulent velocity ξt= 1.40 kms−1. The metallicity of HD377 is slightly higher than of the Sun, [Fe/H]=0.21. The lithium abundance is very high log ε(Li) = 3.02.
A novel keratin 10 gene mutation causing epidermolytic hyperkeratosis (bullous congenital ichthyosiform erythroderma) in a term neonate
Authors: Pegu Satyaranjan , Bodani Jaya. P. , Lemire Edmond G. , Holfeld Karen I. 
Published: March 2017

Abstract
Epidermolytic hyperkeratosis (EHK) is a rare skin condition characterized by erythroderma and blistering at birth, leading to generalized hyperkeratosis of varying severity in adulthood. EHK is frequently mistaken for staphylococcal scalded skin syndrome (SSSS) or epidermolysis bullosa. EHK is usually inherited in an autosomal dominant fashion, but very rare autosomal recessive families have been reported. Molecular genetic testing in this patient identified a novel homozygous keratin-10 gene (KRT10) mutation consistent with autosomal recessive inheritance. Furthermore, diagnosis was achieved by molecular genetic testing circumventing the need to perform a skin biopsy.
On the gate complexity of reversible circuits consisting of NOT, CNOT and 2-CNOT gates
Authors: Zakablukov Dmitry V. 
Published: March 2017

Abstract
The paper is concerned with the problem of complexity of reversible circuits consisting of NOT, CNOT and 2-CNOT gates. For a reversible circuit implementing a map

f
:

Z

2
n

→

Z

2
n

$f: \mathbb Z_2^n\, \to\, \mathbb Z_2^n$

we define the Shannon complexity function L(n, q) as a function of n and the number q of additional inputs in the circuit. We prove the lower estimate

L
(
n
,
q
)

⩾

2
n

(
n
−
2
)

3

log
2

⁡
(
n
+
q
)

−

n
3

$L(n,q)\, \geqslant\, \displaystyle\frac{2^n(n-2)}{3\log_2(n+q)} - \frac{n}{3}$

for the complexity of a reversible circuit and derive the upper estimate L(n, 0) ⩽ 48n2
n
(1 + o(1)) / log2
n if there are no additional inputs. The asymptotic upper estimate for the complexity is shown to be L(n, q
0) ≲ 2
n
with q
0 ∽ n2
n−o(n) additional inputs.
A Simple Ultra-Wideband Magneto-Electric Dipole Antenna With High Gain
Authors: Shuai Chen-yang , Wang Guang-ming 
Published: March 2017

AbstractA simple ultra-wideband magneto-electric dipole antenna utilizing a differential-fed structure is designed. The antenna mainly comprises three parts, including a novel circular horned reflector, two vertical semicircular shorted patches as a magnetic dipole, and a horizontal U-shaped semicircular electric dipole. A differential feeding structure working as a perfect balun excites the designed antenna. The results of simulation have a good match with the ones of measurement. Results indicate that the designed antenna achieves a wide frequency bandwidth of 107 % which is 3.19~10.61 GHz, when VSWR is below 2. Via introducing the circular horned reflector, the designed antenna attains a steady and high gain of 12±1.5dBi. Moreover, settled broadside direction main beam, high front-to-back ratio, low cross polarization, and the symmetrical and relatively stable radiation patterns in the E-and H-plane are gotten in the impedance bandwidth range. In the practical applications, the proposed antenna that is dc grounded and has a simple structure satisfies the requirement of many outdoor antennas.
Effects of Rare Earth on Mechanical Properties of LZ50 Axle Steels and Its Formation Mechanism
Authors: Zhang Jin-ling , Yu Yan-chong , Wang She-bin , Hou Yang , Yin Shu-chun 
Published: March 2017

AbstractTo study the mechanism of rare earth (RE) elements on the mechanical properties of axle steels, trace RE were added to LZ50 axle steel, which was melted in vacuum induction furnace. By calculating the thermodynamic and kinetic of RE inclusions, the formation mechanism of inclusions was discussed. And the effects of RE elements on the microstructures and mechanical properties were investigated. The results show that RE and O elements in the molten steels diffused into the interface and increased the thickness of the liquid film. The inclusions transform into 1–3 μm spherical RE compound inclusions instead of 5 μm Al2O3-SiO2 with sharp edges. The grain sizes of the steels containing 0.0010 %～0.0026 % RE were decreased, impact toughness and fatigue resistance were improved greatly, compared with the steel without RE. The impact toughness and fatigue resistance of the LZ50 steel with the addition of 0.0010 % RE were increased by 1.65 and 2 times, respectively.
Optimization of Esterification of Propionic Acid with Ethanol Catalyzed by Solid Acid Catalysts using Response Surface Methodology (RSM): A Kinetic Approach
Authors: Tiwari Anurag , Keshav Amit , Bhowmick Shubhankar 
Published: March 2017

Abstract
The esterification of propionic acid and ethanol using waste material as catalyst is emerging and a new technology. In this section a carbon based solid acid catalyst was prepared in laboratory by sulfonating waste rice husk char using concentrated H2SO4 and was compared with a commercial catalyst Dowex 50Wx8-400. Characterization analysis of the catalyst was performed using scaning electron microscope (SEM), EDEX and FTIR. Various reaction parameters such as effect of temperature, effect of the molar ratio of ethanol to propionic acid and effect of catalyst loading were investigated. Reusability of catalyst was also performed 4 cycles for efficiency of prepared catalyst. The activation energy (Ea) of esterification was found to be 39.782 kJ mol−1 using rice husk catalyst and 65.306 kJ mol–1 for Dowex 50wx8-400 catalyst. Response surface methodology (RSM) was applied to find the optimal operating conditions in order to maximize the ethyl propionate conversion.
Causal Inference via Algebraic Geometry: Feasibility Tests for Functional Causal Structures with Two Binary Observed Variables
Authors: Lee Ciarán M. , Spekkens Robert W. 
Published: March 2017

AbstractWe provide a scheme for inferring causal relations from uncontrolled statistical data based on tools from computational algebraic geometry, in particular, the computation of Groebner bases. We focus on causal structures containing just two observed variables, each of which is binary. We consider the consequences of imposing different restrictions on the number and cardinality of latent variables and of assuming different functional dependences of the observed variables on the latent ones (in particular, the noise need not be additive). We provide an inductive scheme for classifying functional causal structures into distinct observational equivalence classes. For each observational equivalence class, we provide a procedure for deriving constraints on the joint distribution that are necessary and sufficient conditions for it to arise from a model in that class. We also demonstrate how this sort of approach provides a means of determining which causal parameters are identifiable and how to solve for these. Prospects for expanding the scope of our scheme, in particular to the problem of quantum causal inference, are also discussed.
Effect of Channel Spacing on the Design of Mixed Line Rate Optical Wavelength Division Multiplexed Networks
Authors: Iyer Sridhar , Singh Shree Prakash 
Published: March 2017

Abstract
The ever increasing heterogeneity and growing traffic volume has resulted in significant innovations and paradigm shifts within the telecom backbone networks. In order to cost-effectively respond to the diverse variety of traffic requirements having heterogeneous service demands, wavelength division multiplexed (WDM) optical networks have adopted the mixed line rate (MLR) strategy. In MLR networks, many wavelength channels with various line rates can co-exist within the same fiber which, however, raises many important design issues; one of them being the choice of the channel spacing. The quality of signal is affected by the channel spacing in terms of the bit-error rate (BER), which in turn affects the maximum optical reach of the lightpaths that depends on the line rates. In regard to the aforementioned, different methods can be adopted in order to set the width of the channel spacing, viz., (a) choice of a 50 GHz uniform fixed channel spacing specified by the ITU-T grid, (b) exploring various channel spacing values for different line rates so as to optimize the usage of the fiber spectrum, or (c) seek for an optimal value of the channel spacing which results in the minimum network cost. In the current work, we evaluate the MLR network cost for various channel spacings; hence, we find an optimal value of the channel spacing that leads to the minimum MLR network cost. The simulation results reveal that, for a MLR network, even with the assumption of uniform channel spacing, optimal values of the channel spacing for a minimum cost network can be identified.
Cost Efficient 4 × 2.5 Gb/s Transparent WDM Ring Network using DML and MetroCor Fiber for Long Reach Applications
Authors: Sheetal Anu , Singh Harjit 
Published: March 2017

Abstract
In this paper, we analyze the performance of the 4 × 2.5 Gb/s wavelength division multiplexing (WDM) transparent metro ring network comprising of one network node and eight access nodes. Here, the power requirement of 360 km ring network has been evaluated using the optical signal to noise ratio (OSNR), Q-factor, inter-symbol interference (ISI) and power penalty. The metro network utilized the cost-effective directly modulated laser (DML) and a negative dispersion fiber called MetroCor in order to give enhanced performance in terms of Q-factor. The power requirement of the network is optimized for the signals over SMF-28 and MetroCor fibers. Also, the comparison is drawn between uncompensated and compensated (with -post and -symmetrical) SMF-28 fibers in the metro environment. The excellent value of Q-factor is obtained at all the nodes. Also, the results show higher OSNR values in the metro environment. Although, smaller power penalties are detected for nodes closer to the network node, but distant nodes require higher power for better transmission.
Research Article. Geodesic equations and their numerical solutions in geodetic and Cartesian coordinates on an oblate spheroid
Authors: Panou G. , Korakitis R. 
Published: March 2017

Abstract
The direct geodesic problem on an oblate spheroid is described as an initial value problem and is solved numerically using both geodetic and Cartesian coordinates. The geodesic equations are formulated by means of the theory of differential geometry. The initial value problem under consideration is reduced to a system of first-order ordinary differential equations, which is solved using a numerical method. The solution provides the coordinates and the azimuths at any point along the geodesic. The Clairaut constant is not used for the solution but it is computed, allowing to check the precision of the method. An extensive data set of geodesics is used, in order to evaluate the performance of the method in each coordinate system. The results for the direct geodesic problem are validated by comparison to Karney’s method. We conclude that a complete, stable, precise, accurate and fast solution of the problem in Cartesian coordinates is accomplished.
Participatory selection of orange-fleshed sweetpotato varieties in north and north-east Côte d’Ivoire
Authors: Brice Dibi Konan Evrard , Essis Brice Sidoine , N’zué Boni , Kouakou Amani Michel , Zohouri Goli Pierre , Assouan Amon Brice , Van Mourik Tom 
Published: March 2017

Abstract
Sweetpotato is cultivated in all the regions of Côte d’Ivoire for consumption and as a source of income. Only varieties with white or yellow flesh are grown. Production of nutritious orange-fleshed sweetpotato (OFSP) is hampered by the lack of genetic resources and planting material. To evaluate and release OFSP varieties, on-farm demonstration tests were conducted with women farmer groups in Bondoukou, Nassian, Korhogo and Bondiali in the north and northeast Côte d’Ivoire. Six varieties- ‘Kabode’, ‘Kakamega7’ (‘Irene’), ‘Tacha’, ‘Bela Bela’, ‘Vita’ and TIB-440060-were evaluated in comparison with locally grown varieties. The on-farm demonstration was laid out in a randomised complete block design with replicated three times per location. Assessments were made on yield, disease and pests; and consumer preference on attractiveness of skin color and flesh of the root (fresh and boiled), taste, texture and starchiness. Results showed that introduced varieties have generally recorded higher yields than the local varieties: Yields of about 25 t/ha have been recorded on the sites. The best average yield of about 15 t/ha, was recorded for TIB-440060 and ‘Irene’ varieties. Farmers’ acceptance of OFSP varieties based on the attraction of their color, the dry matter content and taste was more than 90%. At the end of the sensory tests, ‘Irene’, which achieved the best compromise between all observed and measured parameters, was most appreciated and was the farmers’ first choice, followed by varieties TIB-440060 and ‘Bela bela’.
Unsicherheitsbetrachtung für bildbasierte minimalinvasive Eingriffe an der Otobasis
Authors: Bredemann Judith , Voigtmann Christoph , Schmitt Robert H. 
Published: March 2017

Zusammenfassung
Neue, minimalinvasive Operationsverfahren können nur eingeführt werden, wenn das resultierende Risiko für den Patienten
vertretbar ist. Einheitliche Verfahren zur Abschätzung des Patientenrisikos gibt es bisher nicht. Im Rahmen der
Entwicklung der Multi-Port-Knochenchirurgie am Beispiel der Otobasis (MUKNO) wurde ein Modell erarbeitet, mit dem das
Risiko für minimalinvasive Eingriffe an der Otobasis präoperativ und patientenindividuell abgeschätzt werden kann. Das
Modell basiert auf der Abschätzung von Unsicherheitsbeiträgen entlang des gesamten
Operationsprozesses. Ein Unsicherheitsbeitrag, der für die Risikoabschätzung quantifiziert werden muss, ist
die Messunsicherheit medizinischer Computer-tomographiemessungen. In diesem Beitrag werden die Ergebnisse der
Messunsicherheitsbestimmung für verschiedene
Messaufgaben im Kontext bildbasierter, minimalinvasiver Eingriffe an der Otobasis beschrieben und diskutiert.
Crystallographic aspects of hydrated salts of 4,6-diaminopyrimidine with the first five dicarboxylic acids
Authors: Matulková Irena , Andreoni Renata , Císařová Ivana , Němec Ivan , Fábry Jan 
Published: March 2017

Abstract
The preparation, X-ray single-crystal structure determination and vibrational spectroscopic characterisation of five novel salts, i.e. bis(4,6-diaminopyrimidinium(1+)) oxalate tetrahydrate; 4,6-diaminopyrimidinium(1+) hydrogen malonate monohydrate; bis(4,6-diaminopyrimidinium(1+)) succinate octahydrate; bis(4,6-diaminopyrimidinium(1+)) glutarate dihydrate and bis(4,6-diaminopyrimidinium (1+)) adipate octahydrate, are presented. It is the first crystallographic study with the title cation. All the structures are centrosymmetric. The oxalate, succinate and adipate anions are situated about inversion centres in their respective structures. The dependence on the parity of the number of carbon atoms in the anions is apparent in the interplanar angles of the carboxylate or carboxylic groups. In all of the structures, there are intermolecular N–H···N, N–H···Oacid, N–H···Owater, Owater–H···Oacid and Owater–H···Owater hydrogen-bonds of moderate strength. The most common graph set motif, R
2
2(8), describes the arrangement of the involved carboxylic as well as of the primary- and secondary-amine groups. There is a growing complexity of arrangement of water molecules in the structures with longer anionic molecules. In 4,6-diaminopyrimidinium(1+) hydrogen malonate monohydrate, there is an intramolecular Oacid–H···Oacid bond, and the conformation of the hydrogen malonate ions with non-parallel carboxylic and carboxylate groups is not often observed. The structural parameters of the carboxylic or carboxylate groups in the dicarboxylic acids or their derivatives found in the Cambridge Structural Database (CSD) are compared with the title structures.