bluuebunny/crossref_metadata_2025_split huggingface dataset:
A thin shell of ionized gas as the explanation for infrared excess among classical Cepheids
Authors: Hocdé V. , Nardetto N. , Lagadec E. , Niccolini G. , Domiciano de Souza A. , Mérand A. , Kervella P. , Gallenne A. , Marengo M. , Trahin B. , Gieren W. , Pietrzyński G. , Borgniet S. , Breuval L. , Javanmardi B. 
Published: November 2019

Context. The infrared (IR) excess of classical Cepheids is seldom studied and poorly understood despite observational evidence and the potential for its contribution to induce systematics on the period-luminosity (PL) relation used in the calibration of the extragalactic distance scale.
Aims. This study aims to understand the physical origin of the IR excess found in the spectral energy distribution (SED) of 5 Cepheids: RS Pup (P = 41.46d), ζ Gem (P = 10.15d), η Aql (P = 7.18d), V Cen (P = 5.49d) and SU Cyg (P = 3.85d).
Methods. A time series of atmospheric models along the pulsation cycle were fitted to a compilation of data, including optical and near-IR photometry, Spitzer spectra (secured at a specific phase), interferometric angular diameters, effective temperature estimates, and radial velocity measurements. Herschel images in two bands were also analyzed qualitatively. In this fitting process, based on the SPIPS algorithm, a residual was found in the SED, whatever the pulsation phase, and for wavelengths larger than about 1.2 μm, which corresponds to the so-determined infrared excess of Cepheids. This IR excess was then corrected from interstellar medium absorption in order to infer the presence (or absence) of dust shells and was, ultimately, used in order to fit a model for a shell of ionized gas.
Results. For all Cepheids, we find a continuum IR excess increasing up to approximately −0.1 magnitudes at 30 μm, which cannot be explained by a hot or cold dust model of CircumStellar Environment (CSE). However, a weak but significant dust emission at 9.7 μm is found for ζ Gem, η Aql and RS Pup, while clear interstellar clouds are seen in the Herschel images for V Cen and RS Pup. We show, for the first time, that the IR excess of Cepheids can be explained by free–free emission from a thin shell of ionized gas, with a thickness of ≃15% of the star radius, a mass of 10−9−10−7M⊙ and a temperature ranging between 3500 and 4500 K.
Conclusions. The presence of a thin shell of ionized gas around Cepheids must be tested with interferometers operating in the visible or mid-IR, or using radio telescopes. The impact of such CSEs of ionized gas on the PL relation of Cepheids also calls for further investigation.
Pleomorphic Adenoma in the Lower Lip: A Case Report and a Review
Authors: Nourwali Ibrahim , Dar-Odeh Najla 
Published: November 2019

AbstractPleomorphic adenoma constitutes 50% of salivary gland tumors affecting mostly the parotid gland extraorally, and the palate intraorally. While the upper lip is a common site, it is unusual to encounter this tumor in the lower lip. A 26-year-old man complained of a persistent lump affecting the lower lip. The lesion was excised and was shown on histopathological examination to be a pleomorphic adenoma with squamous metaplasia. At the 18-month review appointment, there was complete healing and no recurrence. Pleomorphic adenoma in the lower lip should be considered among the differential diagnosis of lower labial swellings, especially in young patients. There needs to be reconsideration of the epidemiological and histological characteristics.
Completeness of commutative Sokolov-Odesskii subalgebras and Nijenhuis operators on
Authors: Konyaev A. Yu. 
Published: November 2019

Abstract
We prove the completeness of commutative subalgebras in the algebra

constructed from the algebraic Nijenhuis operators. The operators in question were proposed by Sokolov and Odesskii.
Bibliography: 17 titles.
Racial Inequities in U.S. Naloxone Prescriptions
Authors: Madden Erin Fanning , Qeadan Fares 
Published: November 2019

Background: Research indicates U.S. racial and ethnic minority patients are prescribed opioids for pain less often than non-Hispanic Whites. Racial inequities are strongest for pain conditions with uncertain prognosis (e.g., chronic pain syndrome) compared to acute pain with defined duration (e.g., fractures). As naloxone, an opioid overdose reversal drug, becomes more popular among prescribers in clinical contexts, it is unclear whether racial inequities also extend to naloxone prescriptions. Methods: Patients diagnosed with bone fracture ( n = 551,103) or chronic pain syndrome [CPS] ( n = 173,341) were identified using ICD-9 and ICD-10 codes in electronic health records from the Health Facts® Database. Logistic regressions were used to determine whether the likelihood of receiving a prescription for opioids or a co-prescription for opioids and naloxone differ by patient race/ethnicity, which included African American, Native American, Non-Hispanic White, Asian/Pacific Islander, Hispanic, and “other” categories. Results: Multiple logistic regressions show naloxone prescriptions do not consistently mirror trends in opioid prescriptions when broken down by patient race/ethnicity and diagnosis. Patients of color with bone fracture or CPS are largely less likely to receive prescriptions for outpatient opioid analgesics than their non-Hispanic White counterparts. Among bone fracture patients prescribed opioids, African Americans and patients of “other” race/ethnicity are also significantly less likely to receive naloxone prescriptions. However, Native American and Hispanic CPS patients prescribed opioids are more likely to get naloxone prescriptions despite being less likely to get opioid prescriptions. And while Native American and Asian/Pacific Islander fracture patients and “other” race/ethnicity CPS patients are less likely to receive an opioid prescription than non-Hispanic Whites, there is no difference from non-Hispanic Whites in their likelihood of receiving a naloxone prescription. Conclusions: Among patients prescribed opioids, naloxone prescriptions vary by patient race/ethnicity and by health condition, indicating the need for efforts to assure equitable diffusion of this harm reduction intervention.
Robustness analysis of decoding SSVEPs in humans with head movements using a moving visual flicker
Authors: Kanoga Suguru , Nakanishi Masaki , Murai Akihiko , Tada Mitsunori , Kanemura Atsunori 
Published: November 2019

Abstract

Objective. The emergence of mobile electroencephalogram (EEG) platforms have expanded the use cases of brain–computer interfaces (BCIs) from laboratory-oriented experiments to our daily life. In challenging situations where humans’ natural behaviors such as head movements are unrestrained, various artifacts could deteriorate the performance of BCI applications. This paper explored the effect of muscular artifacts generated by participants’ head movements on the signal characteristics and classification performance of steady-state visual evoked potentials (SSVEPs). Approach. A moving visual flicker was employed to induce not only SSVEPs but also horizontal and vertical head movements at controlled speeds, leading to acquiring EEG signals with intensity-manipulated muscular artifacts. To properly induce neck muscular activities, a laser light was attached to participants’ heads to give visual feedback; the laser light indicates the direction of the head independently from eye movements. The visual stimulus was also modulated by four distinct frequencies (10, 11, 12, and 13 Hz). The amplitude and signal-to-noise ratio (SNR) were estimated to quantify the effects of head movements on the signal characteristics of the elicited SSVEPs. The frequency identification accuracy was also estimated by using well-established decoding algorithms including calibration-free and fully-calibrated approaches. Main results. The amplitude and SNR of SSVEPs tended to deteriorate when the participants moved their heads, and this tendency was significantly stronger in the vertical head movements than in the horizontal movements. The frequency identification accuracy also deteriorated in proportion to the speed of head movements. Importantly, the accuracy was significantly higher than its chance-level regardless of the level of artifact contamination and algorithms. Significance. The results suggested the feasibility of decoding SSVEPs in humans freely moving their head directions, facilitating the real-world applications of mobile BCIs.
Determination of the proportion of natural light in solar radiation using the method of conversion of lighting units into energy
Authors: Sterhov A I , Loshkarev I Yu 
Published: November 2019

Abstract
In the article the method for the determination of the fraction of visible light in solar radiation was proposed. The solar spectrum was divided into three regions: ultraviolet, visible and infrared radiation. The spectral distribution of the intensity of solar radiation under various conditions was considered. With the help of the Mathcad software package, the spectral luminosity of a black body was calculated. Further, the proportion of natural light in solar radiation was estimated. The proposed method of converting lumens to watts consisted of 5 stages: normalization of the spectral luminosity curve of BB in the visible range by one; determination of the energy fraction of each wavelength introduced into the radiation intensity; obtaining the dependence of the illumination distribution on the radiation wavelength in lumens on the basis of the eye visibility curve; multiplying the values of the normalized spectral luminance curve with the values of the eye visibility curve in lumens; summation (integration) of the obtained values. This calculation showed that 1 W/m2 of natural light is 213 lm/m2, which was confirmed by 100,000 lux (lm/m2) with solar radiation of 1000 W/m2.
Calculation of the critical power density of natural light in a polymer optical fiber
Authors: Sterhov A I , Petrov K A , Loshkarev I Yu 
Published: November 2019

Abstract
This article discusses the advantages of polymer fiber over quartz one. The comparison is made between the absorption spectra of polymethylmethacrylate, perfluoropolymer and quartz fibers. The scheme of thermophysical processes occurring during the interaction of radiation with matter is considered. The formulas for calculating the threshold (critical) power density necessary for heating the surface to a given temperature for pulsed and continuous heating are derived. Further, the calculations of the critical power density and the allowable size of the area are made, with which the concentration of natural light in the POF could be determined.
Engineering design of solar concentrator for transporting sunlight through optical fiber
Authors: Sterhov A I , Petrov K A , Loshkarev I Yu 
Published: November 2019

Abstract
This article presents the development of an optical system for the concentration of natural radiation. The optical system for the developed system of natural illumination based on fiber - Cassegrain system with a two-mirror lens - is considered. A system with a square section of mirrors is justified and calculated. Next, the reflection from the surface of the protective glass made of acrylic is evaluated and the required size of the end face of the polymer fiber used to transmit light to the room is justified. In conclusion, the radiation intensity at the output end of the polymer fiber is calculated. The system parameters were determined: a large mirror diameter of 198 mm, a small mirror diameter of 34.9 mm, a large mirror focal length of 49.5 mm, a small mirror focal length of 7.189 mm, the distance between the surfaces of the mirrors is 40 mm. The evaluation of the reflection from the surface of the protective glass made of acrylic showed that for the protective window of flat geometry the reflection coefficient is 7.74% and the convex geometry is 8.83%. The calculation of the radiation intensity at the output end of the polymer fiber showed that the total output power of the system will be determined by the number of fibers in the system.
Acceleration methods for modelling the static modes of electronic devices
Authors: Chye E U , Shein A B , Levenets A V 
Published: November 2019

Abstract
The modelling of the static modes of complicated electronic devices on the basis of the solution of the differential equations is their long integration by known numerical methods until establishment of model periodically repeating decisions. For slowly fading transition processes it leads to the increase of modelling time. The article considers the algorithms of the accelerated calculation of the set modes of the electro technical devices described by the differential equations with periodically changing coefficients. The first algorithm based on the solution of the state equation with previously defined values of the initial state vector is transferring the decision to the established values area. The second algorithm is based on a finding of an entry conditions vector for formulas of the exact solution of the state equations transferring the decision to the established values area by use for this purpose of exact decision formulas.
GIS-based models for transport network emergency management
Authors: Mikheeva T I , Osmushin A A , Mikheev S V , Golovnin O K 
Published: November 2019

Abstract
The authors investigated the methods of structural-parametric synthesis, mathematical modeling and optimal control of transport networks from the position of the system analysis. The goals of ensuring the transport infrastructure safety with the positions of the transport network optimal load are determined especially in case of emergency situations. The paper describes the requirements for the development of a mathematical model of the transport network loading. A large number of studies on the transport network load is carried out in the environment of the “ITSGIS” intelligent transport geographic information system and was aimed at the development of the algorithm for automatic detection of emergency situations and congestion. The emergency situation types are characterized by its location, i.e. its coordinates on the electronic map. The emergency time is considered from various positions, such as time of occurrence, normative and actual time of elimination. The geofences of an emergency situation influence are divided into areas of direct and indirect emergency situation influence on transport processes and transport infrastructure objects. On the basis of the constructed models developed management methods of transport network loading and emergency situations analysis, including the collection and processing of raw data, the emergency situations determination and their characteristics, the optimal response strategy choice, the performance of management functions.
Magnetization dynamics of the material with spin triplet states under the action of a weak varying field and spin-lattice interaction in zero constant field
Authors: Fokina N P , Elizbarashvili M O 
Published: November 2019

Abstract
The anisotropic dynamics of spin triplet states (STS) of molecular single crystals in zero constant and weak varying magnetic fields (weakness means the absence of saturation at the steady state and of the nutation at the pulse EPR) directed along the molecular axes, is analytically investigated. The equations are derived for the free motion of the sample magnetization, describing its linear oscillations along that molecular axis, along which its nonzero initial value was created. The tensor of the steady-state dynamical susceptibility to the varying field is found. The result of the action of a short MW pulse on STS is analytically described, containing a periodic dependence on the pulse duration and its detuning. Abovementioned results can be applied also to I=1 NMR, what is important for nitrogen-containing explosives and narcotics monitoring. The anisotropic dynamics of electron spin-lattice relaxation (SLR) at its one-phonon mechanism is investigated without the high temperature approximation over the phonon temperature; the SLR rates of the separate transitions of STS are calculated; the corresponding SLR probabilities are written in the form, which supposes the fractal dimensionality d of a lattice; the results with d=4/3 agree well with the experimental data in STS of the buried tryptophan of ribonuclease T1.
Design of onboard data server for the implementation as a part of onboard avionics equipment using concept of integrated modular avionics
Authors: Titov A G , Neretin E S , Dudkin S O , Brusnikin P M 
Published: November 2019

Abstract
Modern onboard equipment (OBE) includes systems that require storage and processing of large amount of information. At the same time real-time access to data is required. On the samples of national aircrafts, information is most often stored in computers, where the main functions are not data storage, but data processing. Most of the computing resources are spent on running applications. This results in slow processing of requests to a database (DB), which in turn affects the speed of systems that need data from the database or that keep records to the database. The article is devoted to the development of Onboard Data server (ODS) using the concept of integrated modular avionics (IMA) for the onboard avionics equipment of medium-range MS-21 aircraft. ODS is a separate data server computing platform, which provides running of several independent functional applications and carrying out interaction with onboard equipment via AFDX, USB, Ethernet, RS-232 interfaces. The article provides the requirements for the Onboard Data Server, software requirements, architecture, calculation of reliability indicators, four modes of operation: start mode, operating mode, extended control mode and technological mode, describes the algorithm of transition between the modes of operation of the ODS. The use of the ODS will allow reducing the load on the computers of the functional applications of the aircraft systems, simplifying the work of the ground crew interacting with the onboard maintenance system and the aircraft crew, which prepares the flight plan using the navigation data processed on the server.
Small size phase shifter on compact structures
Authors: Khiem N K , Hung L Q 
Published: November 2019

Abstract
This article is devoted to the description of a miniature phase shifter of the reflective type. Its dimensions were reduced with the help of compact structures – they were replaced by structures, both quarter-wave segments and plug-in plumes allowing changing the phase at the output. Phase shifters are used in phased array antennas to change the phase on the emitters and thus change the amplitude-phase distribution, which leads to a change in the radiation pattern. For a large number of emitters, a large number of phase shifters are required, which is why at low frequencies they can occupy a sufficiently large area. For this reason, it is possible to use compact structures that have identical characteristics with transmission lines in a certain frequency band. Such replacement allows saving the occupied area of the power supply circuit of the antenna array (material saving), but at the same time reduces the permissible power. The design of a phase shifter with a Central frequency of 2 GHz, whose area was reduced by 63% in relation to the typical implementation of the design, was investigated.
Microstrip Antenna Topologies for 5G Communication Systems
Authors: Nho L C , Hung L Q 
Published: November 2019

Abstract
In this paper the antenna array designs operating at 28 GHz frequency, which is approved by the Federal Communications Commission for 5G communication systems is presented. The antennas are designed on a standard FAF4D microwave material with a dielectric constant of 2.5 and a thickness of 0.5 mm. Since the frequency band is limited both by the radiator itself and the quarter-wave transformers used, passive radiators have increased the band of operating frequencies of the square array antenna, approximately 5-fold. Also in this paper the authors describe the construction of a diagram-forming circuit (DFC) for supplying microstrip radiators. The whole process of designing the proposed antennas was realized in the Anfost HFSS software, specializing in this software, and the design of the DFC was implemented in NI-AWR.
Analysis of the simulation modeling results of flow of negative impacts on adaptive system to ensure the sustainability of communication system
Authors: Zaitsev M A , Filatov V I , Borukaeva A O 
Published: November 2019

Abstract
The paper presents results of a simulation of flow possible negative effects on the stability of the system perspective. For the simulation, two variants of organization of adaptive management of the communication system were presented, reviewed 20 different options for process control of the organization. Query parameters and flow parameters of the adaptive sustainability system communication systems were defined.
Energy efficiency improvement of 0.4 kV power supply systems in the far North districts
Authors: Dresvianskii E , Panteleev V , Castaneda R , Pokushko M , Shmeleva Zh 
Published: November 2019

Abstract
The article considers the method of energy efficiency improvement of 0.4 kV power supply systems for the enterprise located in the North of the Krasnoyarsk territory. The theoretical substantiation of the necessity of reactive power compensation is presented. The method for reducing reactive power in power supply networks through the use of devices compensating reactive power is proposed. The use of this method allowed reducing energy costs, as well as decreasing the level of reactive power in the network by 48.5% and 45% for the 1st and the 2nd inputs, respectively. Also, while using reactive power compensation devices for power supply networks, the following indicators can be achieved: the increase in the throughput capacity of electric networks, the reduction in active power losses and the rational electric energy use.
Simulating hybrid protection against ultrashort pulse based on its modal decomposition
Authors: Nosov A V , Belousov A O , Surovtsev R S , Gazizov T R 
Published: November 2019

Abstract
The paper considers the possibility of hybrid protection against an ultrashort pulse which is based on cascade connection of a modal filter and a turn of a meander line. A qualitative analysis of ultrashort pulse decomposition into 9 pulses of smaller amplitude in this hybrid device is performed and the conditions for such decomposition are formulated. The quasistatic simulation of the time response showed 9.8 times attenuation of the ultrashort pulse.
Effect of close coupling on performance of a modal filter with the passive conductor in the reference plane cutout
Authors: Samoylichenko M A , Gazizov T R 
Published: November 2019

Abstract
The improvement of protection against an ultrashort pulse (USP) using a modal filter with the passive conductor implemented in the reference plane cutout is considered. The influence of segmentation on the simulation results is shown. The effect of close coupling on the difference between mode delays and the amplitudes of decomposition pulses was studied. Minimization and alignment of the pulse amplitudes are achieved. The possibility of increasing USP attenuation to 5 times for a given material is shown.