bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reassessment of Pediatric Tension-Type Headaches
Authors: Vaiman Michael , Mametov Kadri , Roitblat Yulia , Abba Michael , Nehuliaieva Liliia , Foonberg Maya , Frank Charles , Kaliberdenko Vitalii B. , Shterenshis Michael 
Published: December 2020

AbstractA retrospective multicenter chart review was conducted with the objective of evaluating the hypothesis that certain cases diagnosed as tension-type headache (TTH) in pediatric neurology are not stress-related or central sensitization-related conditions but may mimic an autoimmune disorder of the dura mater. Of the 29,642 patient charts reviewed, 12,424 charts (42%) were excluded because of incomplete data and 17,218 cases were analyzed. For all the 29,642 charts, TTH or chronic daily headaches were diagnosed in 29.2% of cases. Among the 17,218 cases subjected to detailed diagnostic procedures, TTH was diagnosed in only 5%. In 7,044 cases, the initial diagnosis of TTH was changed to headache attributed to infection (87.4%), which was supported by the presence of meningeal signs, high antistreptolysin-O titers, and, in 46% of cases, magnetic resonance imaging (MRI)-detected thickening of the cranial dura mater. The initial diagnosis of migraine was confirmed in 87.7% of cases (8,034/9,162). In some cases of treatment-resistant pediatric recurrent headaches, which are initially diagnosed as TTH, a secondary type of headache may be suspected as the underlying cause. Usually this type of headache has streptococcal infection-related laboratory findings, the meninges as the site of the lesion, and meningism as the clinical presentation.
Management of Chronic Total Occlusion of Coronary Artery
Authors: Mares Adriana , Mukherjee Debabrata 
Published: December 2020

AbstractChronic total occlusion (CTO) of a coronary artery is typically defined as a completely occluded artery without any antegrade flow and a duration of at least 3 months. We reviewed the current literature describing the optimal management of CTO including the role of revascularization and choice of modality, i.e., percutaneous coronary intervention (PCI) or coronary artery bypass graft surgery. Databases (PubMed, the Cochrane Library, Embase, EBSCO, Web of Science, and CINAHL) were searched and relevant studies of patients with CTO were selected for review. The prevalence of coronary artery CTOs is approximately 25% among patients undergoing coronary angiography for angina. Available data suggests that PCI of CTO can be a technically complex procedure with relatively lower success rates compared with non-CTO PCI and typically associated with a higher complication rate especially at nonspecialized centers. Furthermore, successful CTO-PCI is associated with symptomatic improvement but does not appear to improve mortality, myocardial infarction, stroke, and repeat revascularization rates. Based on contemporary data, PCI of CTO lesions may be considered in patients with incapacitating angina despite treatment with optimal guideline-directed medical therapy and in whom based on coronary anatomy there is a reasonable chance of technical success with an acceptable risk.
Achalasia Cardia: A Mimicker of Pulmonary Tuberculosis in a High-Burden Setting
Authors: Sharma Pratibha , Ganga Ranganath T. 
Published: December 2020

AbstractBRICS (Brazil, Russia, India, China, and South Africa) countries account for more than two-thirds of the global tuberculosis burden. Tuberculosis is a common diagnosis in patients presenting with chronic respiratory symptoms in these high-burden countries, which results in other diseases being missed easily. The national tuberculosis elimination program encourages to start antitubercular treatment on a clinical basis even without any confirmatory evidence. This has resulted in missing many nontuberculosis cases and unnecessarily exposing to adverse effects of antitubercular drugs. Here we report one such instance where achalasia cardia was missed for a long time.
Back to basics: Behavioral theory and internationalization
Authors: Surdu Irina , Greve Henrich R. , Benito Gabriel R. G. 
Published: December 2020

AbstractInternational business (IB) scholars’ over-reliance on a select few theories leaves our understanding of firm internationalization incomplete. The behavioral theory of the firm (BTF) can offer new insights and can be used to model a broad range of firm actions. We focus on the three basic BTF components: problemistic search, learning by doing, and vicarious learning. These components help us understand why firm behaviors are more dynamic and heterogeneous than other theories allow. BTF, with its emphasis on how firms assess performance according to aspiration levels, selectively learn and update routines, and selectively incorporate the learning of others, is better suited to examine the diversity and change increasingly observed in internationalization decisions. We explain why scholars should move beyond “dynamizing” static theories and show BTF’s applicability to behaviors involving change such as multi-mode market entries and market re-entries. BTF also helps examine the decision to internationalize in the first place, nascent firm internationalization, location choices, international market adaptation, and headquarter–subsidiary relationships. We encourage IB scholars to use theories that can handle the complexity increasingly associated with modern firm growth, and propose BTF as a promising starting point.
Configuration of transition-metal atoms on iridium-doped graphene
Authors: Han Yan , Wan Jian-Guo , Wan Xiaodan , Chang Yuan , Liu Hongsheng , Gao Junfeng , Wang Guang-Hou 
Published: December 2020

Abstract
Our theoretical calculation and analysis show that the configuration of transition-metal (TM) atoms on iridium-doped graphene depends on the number of the d-state valence electrons of the TM atoms. TM atoms with three or less d-state valence electrons prefer to form a horizontal configuration and destroy the original C3v symmetry of the substrate. If there are more than three (but not five) d-state valence electrons in a TM atom, the TM atom selects the site just on the top of the iridium atoms and thus forms a vertical configuration, and the C3v symmetry of the iridium-doped graphene remains. For TM atoms with five d-state valence electrons and a closed s shell, the TM atoms and the iridium-doped graphene prefer to form an inclined configuration. The configuration regularity of the iridium-doped graphene-adsorbing TM atoms is attributed to the unique spin and orbital angular momentum of the electron in the iridium-doped graphene and the unique selection rule of the charge transfer under spin polarization.
Uniqueness and stability of activated dislocation shapes in crystals
Authors: Gröger Roman , Šremr Jiří , Vydrová Jana 
Published: December 2020

Abstract
Simplified models of thermally activated dislocation glide constitute an important link between atomic-level studies of isolated dislocations and macroscopic thermodynamic properties of materials. These models rest upon the activation enthalpy, which is the energy to transform an initially straight dislocation into its activated state at finite applied stresses. Minimizing this activation enthalpy leads to a boundary value problem for the shape of the dislocation line. Besides two constant solutions corresponding to a straight dislocation in its stable and unstable states at the applied stress, there exist an infinite number of non-constant solutions. We investigate the characters of these solutions for dislocations anchored at their ends. Using the second variation of the activation enthalpy, we derive a set of conditions that define a unique activated state of the dislocation. The corresponding analysis demonstrates that the shape of the dislocation in this activated state must change with the applied stress to maintain the state of minimum activation enthalpy.
Influence of transverse magnetic field on the properties of laser ablation produced nickel oxide nanoparticles
Authors: Safa Mina , Dorranian Davoud , Masoudi Amir Ali , Matin Laleh Farhang 
Published: December 2020

Abstract
Influence of transverse magnetic field on the nickel produced plasma plume and structural and optical properties of nickel oxide nanoparticles produced by pulsed laser ablation (PLA) method have been investigated experimentally. Ablation container was placed between the poles of permanent magnets. Strength of external magnetic field was controlled by the distance between magnets. The direction of the magnetic field was perpendicular to the direction of laser pulse propagation. 5 samples were synthesized in the presence of magnetic fields with different strengths in distilled water. Ablation was carried out by 1064 nm wavelength beam of pulsed Nd:YAG laser of 7 ns pulse width. Effects of external magnetic field on the properties of nickel oxide nanoparticles were characterized by X-ray diffraction patterns, field emission scanning electron microscope images, transmission electron microscope microimages, UV–Vis-NIR absorption spectra, dynamic light scattering patterns, FTIR and photoluminescence spectra. Furthermore, magnetic properties of synthesized nanoparticles were studied using their hysteresis curve which were recorded by vibrating sample magnetometer. Results show that with increasing the strength of external magnetic field, the intensity of XRD peaks of synthesized nanoparticles was increased while their size was decreased. Applying the external magnetic field caused the cyclotron motion of the charged particles in the plasma plume on the surface of target which increased their energy, and decreased their agglomeration.
On the use of patterns obtained from LSTM and feature-based methods for time series analysis: application in automatic classification of the CAP A phase subtypes
Authors: Mendonça Fábio , Mostafa Sheikh Shanawaz , Morgado-Dias Fernando , Ravelo-García Antonio G 
Published: December 2020

Abstract

Objective. The cyclic alternating pattern is a marker of sleep instability identified in the electroencephalogram signals whose sequence of transient variations compose the A phases. These phases are divided into three subtypes (A1, A2, and A3) according to the presented patterns. The traditional approach of manually scoring the cyclic alternating pattern events for the full night is unpractical, with a high probability of miss classification, due to the large quantity of information that is produced during a full night recording. To address this concern, automatic methodologies were proposed using a long short-term memory to perform the classification of one electroencephalogram monopolar derivation signal. Approach. The proposed model is composed of three classifiers, one for each subtype, performing binary classification in a one versus all procedure. Two methodologies were tested: feed the pre-processed electroencephalogram signal to the classifiers; create features from the pre-processed electroencephalogram signal which were fed to the classifiers (feature-based methods). Main results. It was verified that the A1 subtype classification performance was similar for both methods and the A2 subtype classification was higher for the feature-based methods. However, the A3 subtype classification was found to be the most challenging to be performed, and for this classification, the feature-based methods were superior. A characterization analysis was also performed using a recurrence quantification analysis to further examine the subtypes characteristics. Significance. The average accuracy and area under the receiver operating characteristic curve for the A1, A2, and A3 subtypes of the feature-based methods were respectively: 82% and 0.92; 80% and 0.88; 85% and 0.86.
Laser-driven acceleration of ion beams for high-gain inertial confinement fusion
Authors: Badziak Jan , Domański Jarosław 
Published: December 2020

Abstract
Inertial confinement fusion (ICF) is currently one of the two main paths towards an energy source based on thermonuclear fusion. A promising ICF option is ion fast ignition (IFI), in which the ignition of nuclear fuel is initiated by an intense laser-driven ion beam. This paper presents the results of systematic numerical (particle-in-cell) studies of the properties of laser-driven carbon ion beams produced under conditions relevant for IFI, and the feasibility of achieving beam parameters required for fuel ignition is discussed. It was found that a 1 ps 200 kJ infrared laser driver is capable of producing ion beams with parameters required for IFI, even with a simple non-optimised target, but only at small distances (⩽0.1 mm) from the target. At such distances, the beam intensity and fluence exceeds 5 × 1021 W cm−2 and 2 GJ cm−2, respectively, while the beam energy approaches 30 kJ. The ion beam parameters can be significantly improved by carefully selecting the target thickness and shape. However, even with an optimised target, achieving the beam parameters required for IFI is possible only at distances from the target below 0.5 mm. The ion acceleration is accompanied by the emission of powerful (⩾50 PW) pulses of short-wavelength synchrotron radiation which are the source of significant ion energy losses and may pose a threat to the fusion infrastructure. In addition to ICF, the extremely intense ion beams demonstrated in the paper can be a unique research tool for research in nuclear physics, high energy-density physics or materials science.
Analysis of static electric field characteristics of ships in flowing medium
Authors: Fang Fang , Wang Xiangjun , Liu Dehong , Xu Qinglin 
Published: December 2020

Abstract
At present, the model of ship corrosion electrostatic field mainly analyzes the electrostatic field distribution in the static medium under the given boundary conditions, without considering the actual corrosion of the metal on the ship’s surface in the flowing seawater, and the relationship between the electrochemical corrosion of the metal and the flow of the medium is very large, which results in a large error between the simulation results and the actual measurement results. In this paper, the relationship between corrosion electrostatic field and flow rate in flowing medium is theoretically deduced. Firstly, the distribution of liquid flow rate is analyzed, the thickness of boundary layer on the surface of metal plate is calculated, then the mass transfer process in flowing electrolyte is calculated by combining the flow rate distribution of metal surface medium, and the corrosion current density on the metal surface under the control of mass transfer process is calculated. Finally, the corrosion current density on the metal surface under the control of mass transfer process is calculated. The equivalent source model of electric field is established based on the current density, and the distribution of corrosion electrostatic field in the medium is analyzed. The correctness of the conclusion is verified by the finite element simulation and the ship model experiment.
Prediction method of formation pressure for the adjustment well in the reservoir with fault
Authors: Zhong Liguo , Zhu Tianyin , Hao Tongchun , Zhang Xiaocheng , Wang Xiaopeng , Zhang Lei 
Published: December 2020

Abstract
Adjustment wells need to be deployed in the middle and late stages of oilfield development to improve development efficiency. However, the multiple pressure systems would be happened in the fault block oilfields due to the geological faults are developed and multi-layer joint water injection. The well kick and leakage would happen during drilling and completion operations of adjustment well because of the large dynamic pressure changes such as high-pressure or low-pressure. A pressure prediction method established base on seepage theory and fluid mechanics theory in order to ensure the safety operations during the adjustment well drilling and completion. This method could predict the maximum formation pressure of adjustment wells in complex fault block reservoirs by considering the influence of faults and surrounding injection-production wells. The error between prediction results and numerical simulation results is less than 10% based on Bohai fault block oilfield. The scheme of shut-in of surrounding water injection wells during drilling and completion of adjustment wells in fault block oilfield is given. This method has significance guidance for the design of shut in adjustment well drilling and completion.
Study on the behavior of a light sphere rising in a square tube using the lattice Boltzmann method
Authors: Guan Geng , Ying Yuxiang , Nie Deming 
Published: December 2020

Abstract
In this study the motion of a light sphere under gravity in a square tube was numerically investigated through a three-dimensional lattice Boltzmann method. The width of the square tube is fixed at five times the diameter of the sphere. Simulations were carried out in the Reynolds number range of 140 to 200. Three types of behavior of the rising sphere behavior were revealed, namely the steady state, periodic state and chaotic state. In particular, the sphere exhibits a spiral path in the periodic regime. The effects of the Reynolds number on the oscillations of the sphere were also examined.
Post-1980s shift in the sensitivity of tundra vegetation to climate revealed by the first dendrochronological record from Bear Island (Bjørnøya), western Barents Sea
Authors: Owczarek Piotr , Opała-Owczarek Magdalena , Migała Krzysztof 
Published: December 2020

Abstract
Tundra vegetation dynamics are an excellent indicator of Arctic climate change. In many places in the Arctic, greening of tundra has been observed since the 1980s due to rapid increases in temperature. However, in some areas the opposite process has taken place in connection with a reduction in biomass production. The spatial patterns of tundra ‘greening’ and ‘browning’ constitute important issues in the contemporary analysis of polar ecosystems. The aim of our study was to assess recent tundra vegetation dynamics on the basis of changes in annual growth ring widths of the polar willow. Bjørnøya (Bear Island), located in the western part of the Barents Sea is an important site in the transition zone between the high and low Arctic. No dendrochronological studies have been conducted to date due to the island’s isolation, which makes access very difficult. In 2012 and 2016, 43 samples of Salix polaris Wahlenb. were taken from the south-eastern part of Bear Island. An average chronology of the 29 most closely correlated measurement series was then compiled, covering 95 years (1922–2016); however, the time span 1946–2016 was used for the climate-growth analysis. Beginning in the mid-1980s, an increase in the width of annual increments was observed, whereas over the last decade (since 2005) the growth rate has declined rapidly. Simple correlation analyses showed that temperatures in spring and summer had the positive influence on the radial growth of the polar willow; however, the results of the moving correlation analysis made it possible to conclude that this relationship is more complex and time-dependent. Sensitivity of radial growth to temperature was strongest in the years 1955–2005, whereas the decrease in the strength of positive correlation with temperature since 2005 has been accompanied by a significant increase in the importance of summer precipitation.
Residue in the Mangrove Surface Sediment with the Feasibility of Phytoremediation Application
Authors: Suttiarporn P , Hongsawat P , Siripokharattana K , Thongboonmee N , Dalert M , Thongsai P , Sombut W 
Published: December 2020

Abstract
The present study investigated heavy metal contaminations in the mangrove surface sediment of Rayong coast, Thailand. Sediment samples were collected from 5 locations with each 3 sampling sites and analyzed for heavy metal (Cu, Pb, Cr, Zn and Mn) contents using microwave digestion and MP-AES. The results revealed that concentrations of the heavy metals ranged from 10.54-66.53 mg/kg for Cu, 21.71-116.40 mg/kg for Pb, 21.21-66.66 mg/kg for Cr, 17.67-397.01 mg/kg for Zn and 46.55-1609.53 mg/kg for Mn. Although, the concentrations of Cu, Pb and Zn in surface sediments exceed the effects range low (ERL), did not exceed the effects range median (ERM) of the guidelines. Meanwhile, the feasibility of treating a heavy metal-contaminated soil via mangrove phytoremediation showed the removal efficiency of heavy metals contaminated in sediment occurred in descending order of Mn>Pb>Cr>Cu>Zn (93.11, 80.42, 70.03, 67.09 and 52.50 %, respectively). After spiked more concentration of heavy metals, decreasing removal efficiency was occurred in all treatments that might be caused of the higher heavy metal intake. Beside of these contaminated conditions, the mangrove plants can still survived after 30 days. Which indicated the tolerated to the high level of heavy metals.
The Emerging Trends of Risk Management in Renewable Energy Projects
Authors: Xue Jiao , Fan Heng , Yue Gaoyu 
Published: December 2020

Abstract
The development of renewable energy (RE), due to the ever-growing increase in energy demand and the negative impact of fossil fuels on the environment, has become an increasingly important development area at present, with broad prospects. However, compared with traditional energy projects, RE projects often involve long life cycles, complex uncertainties, and they exert for-reaching impacts on risk management. The Citespace software was used to systematically summarize the research hotspots development, and frontiers of researches on the risk management in renewable energy projects in China from 1997 to 2018. Results show that the overall evolutionary trend of risk management in renewable energy field is from RM practice to technology driven integration system. Based on the trend, knowledge gaps and future research directions were found out and discussed.
Experimental Study on the Presence of Mineral Admixtures and Steel Fiber on the Elastic Properties of Self-Compacting Concrete (SCC)
Authors: Vijaya Kumar S. , Swami B L P , Dean Kumar B. 
Published: December 2020

Abstract
The elastic properties like young’s modulus and poison’s ratio are critical issues in the design of concrete structures. This technical paper focuses on the influence of the mineral admixtures like flyash and condensed silica fume along with percentage of steel fibers on the compressive strength and elastic properties of self-compacting concrete (SCC). The flow ability, passing ability along with the segregation resistance tests were conducted. Designed the M40 grade of SCC as per American concrete institute (ACI) provisions. The cement is mingle with flyash(FA) at 20% and condensed silica fume(CSF) at 10% as partial replacement by weight. The steel fiber of diameter 1mm and aspect ratio of 40 mixed at 0.2, 0.4, 0.6, and 0.8 percentages by volume of the concrete. The Young’s modulus and Poisson’s ratio are resolved as per American standard for testing materials (ASTM) specifications. Based on the experimental investigation, conclusions drawn on the contribution of mineral admixtures and steel fiber on the compressive strength and elastic properties of SCC. A mathematical model developed and checked the validity of the equation with the experimental results.