bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reworking Protocols in the Ophthalmology Department during the COVID-19 Crisis
Authors: Gupta Parul Chawla , Kumar-M Praveen , Ram Jagat 
Published: June 2020

AbstractEye care professionals are susceptible to contract COVID-19 infection due to the presence of the virus in tears and conjunctival secretions and, also, partly due to the proximity required during ophthalmic examination. Although infrequent, ocular features include conjunctivitis (predominant), chemosis, follicles, itching, dry eye, and tearing. In this article, we have outlined salient safety recommendations at outpatient, inpatient and operation theater level for both patients as well as health care workers. Some of them being, creation of special triage areas at ophthalmology clinic for the screening of patients, things to be avoided at each level, procedures to manage appointments, examination room modifications, operation theater protocols, a suggestion for prioritizing cases, and finally airflow and hospital staff management. These suggestions, along with local hospital-specific modifications, will help us to go a long way in the battle against COVID-19.
Understanding the underlying mechanisms of Quiet Eye: The role of microsaccades, small saccades and pupil‐size before final movement initiation in a soccer penalty kick
Authors: Piras Alessandro , Timmis Matthew , Trofè Aurelio , Raffi Milena 
Published: June 2020

AbstractExperts keep a steady final fixation at a specific location just before final movement initiation, the so‐called “quiet eye” (QE). However, the eyes are rarely “quiet”, and small eye movements occur during visual fixation. The current research investigated the subtle eye movements and underlying mechanisms immediately prior to and during QE. The gaze behaviour of 8 intermediate‐level goalkeepers was recorded as they moved (either left or right) in an attempt to predict the future direction of the ball during a soccer penalty kick. Goalkeepers were more likely to predict the direction of the penalty, which was coupled with delaying movement initiation. The temporal sequence of microsaccade rates dropped ∼1000 ms before goalkeepers’ final movement initiation. Saccade rates increased, reaching a peak ∼500 ms before final movement initiation, concomitant with microsaccades reduction. Microsaccades predicted the goalkeepers’ direction, oriented to the right when goalkeepers moved to the right, and conversely to the left when they moved to the left. Microsaccades may be modulated by attention and appear functionally related to saccadic intrusions. Pupil‐size increased proportionally with the lead up to the instance of the penalty being kicked, reaching a plateau at final movement initiation. In conclusion, microsaccades and small saccades could improve the perception of the soccer penalty kick, helping athletes during the period that precedes the critical movement initiation, shifting from covert to overt attention for identifying the useful cues necessary to guide the action.
Gentle plasma process for embedded silver-nanowire flexible transparent electrodes on temperature-sensitive polymer substrates
Authors: Kinner Lukas , List-Kratochvil Emil J W , Dimopoulos Theodoros 
Published: June 2020

Abstract
The present study investigates processing routes to obtain highly conductive and transparent electrodes of silver nanowires (AgNWs) on flexible polyethylene terephthalate (PET) substrate. The AgNWs are embedded into a UV-curable polymer to reduce the electrode roughness and enhance its stability. For the purpose of device integration, the AgNWs must partially protrude from the polymer, which demands that their embedding is followed by a transfer step from a host substrate to the final substrate. Since the AgNWs require some sort of curing (thermal or plasma) to reduce the electrode sheet resistance, a thermally stable host substrate is generally used. This study shows that both thermally stable polyimide, as well as temperature-sensitive PET can be used as flexible host substrates, combined with a gentle, AgNW plasma curing. This is possible by adjusting the fabrication sequence to accommodate the plasma curing step, depending on the host substrate. As a result, embedded AgNW electrodes, transferred from polyimide-to-PET and from PET-to-PET are obtained, with optical transmittance of ∼80% (including the substrate) and sheet resistance of ∼13 Ω/sq., similar to electrodes transferred from glass-to-glass substrates. The embedded AgNW electrodes on PET show superior performance in bending tests, as compared to indium-tin-oxide electrodes. The introduced approach, involving low-cost flexible substrates, AgNW spray-coating and plasma curing, is compatible with high-throughput, roll-to-roll processing.
Flux pinning and microstructure of a bulk MgB2 doped with diverse additives
Authors: Jirsa M , Rameš M , Miryala M , Svora P , Duchoň J , Molnárová O , Arvapalli S S , Murakami M 
Published: June 2020

Abstract
In bulk high-temperature superconductors, Ag is usually used as an additive thus improving mechanical performance. In MgB2 doped with Ag, the Ag reacts with Mg, forming Mg–Ag phases acting as a vortex pinning medium. In this work, we analyze the electromagnetic and pinning properties of bulk MgB2 doped with 1 wt% MgB4, 4 wt% Ag, and 1 wt% Dy2O3, prepared at the Shibaura Institute of Technology (SIT), Tokyo. In three compounds of MgxB2 + 4 wt% Ag with x = 1, 1.075, and 1.1, the effect of Mg excess was studied. The magnetic moment was measured by a vibrating sample magnetometer (VSM). Pinning was studied in terms of a pinning diagram, i.e. the field dependence of the normalized pinning force density, F
n = F/F
max. In all studied samples, the peak of the F
n (b) dependence (b= B/B
irr, B
irr being the irreversibility field) was observed at around b= 0.2, indicating a prevailing flux pinning at grain boundaries. A slight shift of the peak with decreasing temperature indicated a defect size distribution in the pinning landscape. Transmission electron microscopy (TEM) showed a granular structure of all samples composed of MgB2 grains of about 230 nm (average size), with ensembles of small grains (22 nm in average) of Ag3Mg, AgMg, Ag, Dy2O3, and MgB4. While the large MgB2 grains control the main pinning mechanism, the small precipitates seem to determine details of the current flow through the grain boundaries.
Kinetics laws as the base for mathematical simulation of microwave vacuum drying process
Authors: Antipov S T , Arapov V M , Kazartsev D A 
Published: June 2020

Abstract
The process of drying food is extremely complex. Therefore, the mathematical modeling of the process needs high requirements. The combination of approaches in modeling is of practical interest. On the one hand, analytical solutions based on the application of physical laws or phenomenological equations are used. On the other hand, experimental identification of the relationship between temperature and body moisture, which is considered as a peculiar characteristic of heat and mass transfer for each material. It is proposed to consider vacuum microwave drying from the standpoint of physical chemistry as a quasitopochemical heterogeneous reaction and perform mathematical modeling of this process based on the laws of chemical kinetics.
Measuring Probability of Failure of Thermoelectric Legs through Lognormal and Weibull Distribution
Authors: Sattar S 
Published: June 2020

Abstract
Thermoelectric devices are potential candidates to recover energy from dissipated waste heat and are environmentally friendly. It produces energy through temperature differences. Regarding to its fundamental characters, heat plays a significant role for effective energy conversion. At the same moment, creating high-performance thermoelectric generators at higher temperature with a reliable operational life is one of the main challenges. When the temperature of the device goes up, in order to get maximum output, the device encounters stress at his edges and within volume. This whole phenomenon makes calculation of reliability complex, especially measuring the operational life of thermoelectric device. In this paper TE materials composed of Bismuth Telluride were studied. Stress data was collected from different experiments and analyzed through Lognormal and Weibull distribution in order to calculate probability of failure of TE legs. The simulation was done on MATLAB.
Software for analysis of parameters and characteristics of Semiconductor Optical Amplifier
Authors: Kozhanova E R , Belyaev V V , Tkachenko I M , Yazbeck H 
Published: June 2020

Abstract
The article discusses the prospects of modernization of the author’s software «labpraktikum_osnov_wavelet» for studying and analyzing the parameters and characteristics of a semiconductor optical amplifier (SOA) by expanding the list of wavelet analysis types in order to select the most informative type of wavelet analysis and wavelet function to interpret the results.
The dielectric properties of nematic LC-1289 in microwave range
Authors: Emelianov V A , Gevorkyan E V , Barabanova N N , Zhachkin V A 
Published: June 2020

Abstract
The paper presents data on the anisotropic complex dielectric permeability of nematic LC-1289 in microwave range. The obtained data allow us to build a Cole-Cole diagram. It indicates the existence of two dispersion regions for transversal permittivity and one dispersion region for longitudinal permittivity and corresponding relaxation times.
Investigation of the effect of electric pulse heat treatment of rapid-quenched Ti50Ni25Cu25 alloy ribbons with a thin surface crystal layer on the structure formation from an amorphous state
Authors: Sitnikov N N , Khabibullina I A , Shelyakov A V , Mashchenko V I , Sivtsova G V 
Published: June 2020

Abstract
This work is devoted to the study of the influence of electric pulse heat treatment of rapid-quenched Ti50Ni25Cu25 alloy ribbons (at. %) with a surface crystal layer. The object of the study was a rapid-quenched layered amorphous-crystal ribbon with a thickness of about 30 µm and a width of about 1.5 mm, in which a thin surface crystal layer (2.5 µm) was present on the non-contact side relative to the quenching wheel. The alloy samples were subjected to electric pulse treatment by passing a single pulse of electric current through the sample with a variable duration. For comparison, samples of the alloy were obtained, crystallized by standard isothermal heat treatment. The samples were characterized by means of scanning electron microscopy techniques, energy dispersive X-ray analysis and differential scanning calorimetry. It was shown that electric pulse treatment with an exposure time of less than 1 second leads to a significant change in the formed crystalline structure in comparison with the structure obtained by isothermal treatment. The microstructure of such samples in cross section is characterized by an uneven distribution of crystals over the thickness of the ribbon: columnar crystals are observed from the contact and non-contact sides of the ribbon, and large crystals are present in the inner part of the ribbon.
Procedure for determining the dye solution concentration distribution in laminar water flow in glass channel
Authors: Sultanov F O , Bykhalo I B , Levchenko A A 
Published: June 2020

Abstract
An experimental technique has been developed aimed at determining a dependence of the distribution of Rhodamine G concentration in a water solution flow in a glass channel. It has been demonstrated that in the water flow moving in the glass channel, a stationary pattern of the distribution of solution concentration in water along the channel is established. The dye concentration is distributed uniformly over the channel due to molecular diffusion.
The kinetic inductance of single-walled carbon nanotube metal type
Authors: Ivliev P A 
Published: June 2020

Abstract
The results of theoretical studies of the kinetic inductance Lk metallic single-walled carbon nanotube type, taking into account the electron-electron interaction in the approximation of a right circular cylinder are presented. The system under consideration is a cylindrically symmetric potential well with a final height of the wall. As part of the response of the theory of two-dimensional electron gas in the external electromagnetic disturbance obtained in the form of kinetic inductance depending on the nanotube diameter, frequency and intensity of the radiation. Established that Lk value increases with increasing frequency, and decreases with increasing radiation intensity.
Registration of vortex motion in the bulk of superfluid helium by injected charges
Authors: Sultanova M R , Remizov I A 
Published: June 2020

Abstract
We developed a technique for studying the vortex motion created by waves on the surface of superfluid helium-4 using charges injected into the bulk of the liquid. The charges move from the source to the five sectional collector mounted on the opposite side. The interaction of charges with vortices formed by the waves on the surface leads to a change in the distribution of currents recorded by the collector segments.
Study of light-scattering properties of protein-containing microparticles with a small difference in refractive indices
Authors: Chirikov S N , Shkirin A V , Konnova A S , Savchenko I V , Vasilievich N V , Bunkin N F 
Published: June 2020

Abstract
The refractive indices of fodder yeast grown on oil paraffins (paprin) and natural gas (gaprin) were measured by phase microscopy. The scattering matrices of aqueous suspensions of paprin and gaprin are calculated within the framework of the model of spherically symmetric particles. The possibility of identifying the suspensions by their scattering matrices is analyzed for a small difference in the real parts of the refractive index. Experimental measurements of the light scattering matrices show that in the region of small values of the size parameter (≈ 1) the identification of paprin and gaprin can be based only on the difference in the shapes of the particles, and the difference in the refractive indices is manifested for the values of the size parameter greater than 3.
Programming teaching methodological foundation improvement
Authors: Gramakov D A , Shevchuk M V , Shevchenko V G , Chukalovskaya E M 
Published: June 2020

Abstract
Annotation. In the paper an analysis of various programming languages previously used for educational process are carried out. Criteria are proposed to be followed for choosing a language in programming courses that will result in the improvements in the study. The basic methodological approaches to teaching programming in the course “Languages and programming methods” are described. The requirements for training tasks are developed, which will gain the interest in programming. Ways of further improvements to the teaching process are discussed.
Faber polynomial coefficient estimates for a subclass of bi-univalent functions involving q-analogue of Ruscheweyh operator
Authors: Elhaddad Suhila , Darus Maslina 
Published: June 2020

Abstract
In this article, we introduce a new subclass of analytic bi-univalent functions using the Ruscheweyh type q-analogue operator. In addition, we estimate upper bounds for general and early bounds of Taylor-Maclaurin coefficients in functions of the class which is considered by using Faber polynomial expansions.
Survey on topological indices and graphs associated with a commutative ring
Authors: Abdussakir  , Sudarman  , Jauhari M N , Ali F 
Published: June 2020

AbstractThe researches on topological indices are initially related to graphs obtained from biological activities or chemical structures and reactivity. Recently, the research on this topic has evolved on graphs in general and even on graphs obtained from algebraic structures, such as groups, rings or modules. This paper will present various topological index concepts, various graph concepts obtained from a commutative ring and some previous studies that are relevant to those two concepts. Based on the various concepts presented, research topics related to topological indices of a graph associated with a commutative ring can be found and carried out.
Segmentation of Leaf Spots Disease in Apple Plants Using Particle Swarm Optimization and K-means Algorithm
Authors: Anam Syaiful 
Published: June 2020

Abstract
Leaf spot disease is one of the causes of a decrease in apple production. Early detection of this disease will increase the quality and amount of apple production. Monitoring the health of apple plants in larger area is traditionally a job that requires a lot of time and effort. The use of drones to detect the leaf spot disease is an alternative technology to monitor the health of apple plants in large areas. The image of an apple leaf taken by a drone needs to be processed by segmenting the apple leaves into the infected and the healthy leaves to detect apple leaf spot disease. K-means clustering offers an algorithm that is simple, fast and works unsupervised to segment images compared to level set algorithms. Random selection of centroid will cause K-means to be trapped at the local optimum point and result in unsatisfactory image segmentation. To solve this problem, Particle Swarm Optimization offers a good solution to optimization problems to avoid convergence problems at the local optimum. Therefore, in this paper, we study how to segment leaf spot disease on apple leaves using the Particle Swarm Optimization and K-means algorithm. The objective function of K-means algorithm optimized by Particle Swarm Optimization is used for segmenting the leaf spot disease. The first step in this proposed method is to convert the leaf image from RGB to CIE L * a * b format. The a component’s of L * a * b format are taken and clustered by using the Particle Swarm Optimization. The global best of the Particle Swarm Optimization becomes an initial centroid of K-means algorithm. The experimental results show that the Particle Swarm Optimization-K-means (PSOK) has a better performance than the K-means algorithm in segmenting leaf spot disease.
Hardness optimization of epoxy filled PTFE with/without TiO2 filler
Authors: Hidayah Ibrahim Nur , Zafir Romli Dr. Ahmad , Noor Idayu Nik Ibrahim Dr Nik 
Published: June 2020

Abstract
Osteoporosis is one of the bone diseases that have the highest number of patients. Throughout the years, there are multiple choices of material that has been used for bone implant such as metals or plastics. The uses of these materials in medical implant are not permanent and they needed to be changed because of its low hardness that would cause pain. In this paper, a new micro bearing concept system by using polymer composite was introduced where epoxy was used as the matrix to improve hardness of micro filler and this composite later can be used in medical implant. PTFE powder filler was used and incorporated at 1%, 3%, 5%, 7% and 10% in the epoxy system respectively. Acetone was used as diluents in the epoxy to improve filler dispersion. Another set of epoxy filled PTFE at 1%, 3%, 5%, 7% and 10% was added with 2% of titanium oxide (TiO2) and results were compared in terms of hardness and density. Result showed composite with TiO2 incorporation obtained highest values which were 5% increase at 3%PTFE loading and 1% increase at 10%PTFE loading for hardness and density respectively compared to the composite without TiO2.
Stress-strain behaviour and strength properties of ambient cured geo-polymer concrete
Authors: Talha Junaid M , Saboor Karzad Abdul , Altoubat Salah 
Published: June 2020

Abstract
Given the high environmental impact of OPC concrete on CO2 emissions, the construction industry is moving towards low carbon alternate binders. In recent years geo-polymer concrete (GPC) has come to the forefront of such efforts. However, challenges remain for GPC to be considered as a main-stream construction material. Since GPC is relatively new material in construction industry, many of its mechanical properties are still not fully understood. The current work looks at the strength properties of ambient cured GPC. This research paper is part of an ongoing investigation on GPC and reports some results of the mechanical properties of ambient-cured GPC. In this study, the stress-strain behavior and compressive strength of such GPC and its dependency on various parameters (ratio and type of activator and proportions & type of pre-cursor materials) is investigated. The results indicate that the compressive strength of GPC is greatly dependent on the proportion of Ground Granulated Blast Furnace Slag (GGBFS) and ratio of activators. It was found that increasing the percentage of GGBFS increased the compressive strength but at the expense of setting time of the mix. The mixes that had GGBFS around 20% of the binder material returned a compressive strength of less than 25 MPa which may not be suitable for structural applications. Whereas, the increase in percentage of GGBFS from 20 to 80% resulted in compressive strength of 40 MPa and higher. The stress-strain relationship of the mixes was compared to two analytical models existed in the literature.
Stress corrosion cracking for dissimilar capacitive discharge welding joint with varied surface preparation and inputted energy
Authors: Lobo Osmar B , Darmadi Djarot B , Novareza Oyong 
Published: June 2020

Abstract
In this article is presented dissimilar welding joint that joins steel and brass bars. Due to its varied melting point the welding process of dissimilar metal has a higher degree of difficulties. Naturally, welding process embeds residual stress and provides voids at least in micro scale. The voids then act as a trigger to develop initial cracks which will grow under external load. Once, the welding joint is exposed to corrosive environment, it will be susceptible to Stress-Corrosion-Cracking (SCC) failure. The quality of the welded joints is considered based on SCC resilience. Two parameters of the Capacitive Discharge Welding Joint which have prominent effects were evaluated: surface preparation and inputted energy. With a proper surface preparation it is hoped optimum welded joints can be obtained. The experiment results show that the oc1 surface preparation, i.e. the sharpened steel interface while the brass is kept on perpendicular edge, provides better performance under SCC load. Highest inputted energy (120J) always provides the longest duration for joint exposed to SCC load before the failure. The high inputted energy gives high heat to melt the interface which in turn produces compact joint at the interface.
Modeling of cleaning up forest debris technology from wood natural mortality
Authors: Karpachev S P , Shadrin A A , Burmistrova O N , Diev R I 
Published: June 2020

Abstract
The article considers the problem of cleaning up forest debris caused by fallen dead wood or wood natural mortality (WNM). Solution to the problem of cleaning and utilization of the WNM and quality control of these sanitary measures in forest was proposed. For conditions of “Medynskiy forestry” enterprise it was proposed technological process of cleaning forest from the WNM. A mathematical model and a conceptual model of the technological process were developed. The maximum values of the utilization coefficients of the winch and the feller are achieved at 30-meter length of the rope (Figure 8). With the increase in the volume of the WNM, the utilization coefficient of the winch increases, and the utilization coefficient of the feller are falls (Figure 9). However, these changes are insignificant (no more than 3.5%) and may not be taken into account in practice. Therefore, for the conditions adopted in the experiments, the length of the traction rope equal to 30 m can be considered optimal for portable hand winches.