bluuebunny/crossref_metadata_2025 huggingface dataset:
Post-swim oxygen consumption: assessment methodologies and kinetics analysis
Authors: Monteiro Ana Sofia , Carvalho Diogo D , Azevedo Rui , Vilas-Boas João Paulo , Zacca Rodrigo , Fernandes Ricardo J
Published: August 2020

Objective: This study aimed at comparing different recovery-based methods to assess the highest exercise oxygen uptake value (

V
˙

O2peak) when swimming at low-moderate, heavy and severe intensities. Complementarily, the different recovery curve kinetics were analysed. Approach: Eighteen competitive swimmers performed a 5 × 200 m front crawl intermittent protocol (0.05 m · s−1 increments and 3 min intervals), with respiratory gas exchange being continuously measured breath-by-breath during and post-exercise using a portable gas analyser. The directly determined

V
˙

O2peak (

V
˙

O2dir) was compared with the values obtained by linear and exponential backward extrapolations (of different intervals) and the recovery curve mathematical modelling. Main results:

V
˙

O2dir rose with intensity increase: 41.96 ± 6.22, 46.36 ± 6.89 and 50.97 ± 7.28 ml · kg−1 min−1 for low-moderate, heavy and severe swims. Linear and exponential regressions applied to the first 20 s of recovery presented the

V
˙

O2peak values closest to

V
˙

O2dir at low-moderate (42.80 ± 5.54 vs 42.88 ± 5.58 ml kg−1 min−1), heavy (47.12 ± 4.91 vs 47.48 ± 5.09 ml kg−1 min−1) and severe intensity domains (51.24 ± 6.89 vs 53.60 ± 8.54 ml kg−1 · min−1, respectively; r = 0.5–0.8, p < 0.05). The mono-exponential function was the best fit at low-moderate and heavy intensities, while the bi-exponential function better characterized the severe exercise domain (with a slow component amplitude, time delay and time constant of 6.2 ± 2.3 ml kg−1 min−1, 116.6 ± 24.3 and 39.9 ± 15.2 s, respectively). Significance: The backward extrapolation of the first 20 s of recovery is the best method to assess the

V
˙

O2peak for a large spectrum of swimming intensities. Complementarily, intensity increases imply different recovery curve kinetics, particularly a mono-exponential behaviour for low-moderate and heavy exertions and a bi-exponential dynamics for severe paces.
Depression evaluation based on prefrontal EEG signals in resting state using fuzzy measure entropy
Authors: Chen Feifei , Zhao Lulu , Li Baimin , Yang Licai
Published: August 2020

Objective: Depression is a mental disorder that causes emotional changes and even suicide. However, there is still a lack of objective physiological data to support current clinical depression diagnosis. Accurate computer-aided diagnosis systems are becoming more and more crucial and urgent for future depression diagnosis. The purpose of this study is to analyze the electroencephalogram (EEG) regularity of depression using fuzzy measure entropy (FMEn), and thus to explore its role in the computer-aided diagnosis of depression. Approach: Three-channel EEG signals among 35 subjects (divided into two groups according to the severity of the disease) were recorded in this study. First, the frontal delta, theta, alpha and beta frequency bands were extracted after preprocessing, and the sample entropy (SEn) and the FMEn were calculated. Then, the difference between the two groups and the correlation between the entropy values and the Hamilton Depression Rating Scale scores were analyzed using statistical analysis. Finally, the results of FMEn were compared with those of SEn. Main results: A better statistically significant difference between the two groups using FMEn was revealed, with p < 0.01 in the theta and alpha bands. In terms of SEn, only SEn_Fp2 in the delta band, SEn_Fp2 in the theta band and SEn_Fp1 in the alpha band performed better, showing significant differences with p = 0.0006, p = 0.002 and p = 0.0114. Significance: These findings suggest that frontal EEG signal complexity analysis with depression using FMEn might be more sensitive than that using SEn. FMEn could be considered as a promising biomarker for future clinical depression detection.
Low-temperature deposition of 2D SnS nanoflakes on PET substrates for flexible photodetectors with broadband response
Authors: Dong Aodi , Tian Tian , Zhao Hongxiao , Li Shasha , Deng Shuwen , Song Xiaohui , Yan Yong , Xia Congxin , Li Jingbo
Published: August 2020

Flexible photodetectors based on two-dimensional (2D) materials hold the promise to open up an unprecedented era for wearable optoelectronic systems. However, there is a major challenge of the inability to directly deposit 2D materials on polymeric substrates due to their high growth temperature. Here, we demonstrate a novel low-cost method to directly fabricate SnS nanoflakes on the poly-ethylene terephthalate substrates. Moreover, the flexible photodetectors based on SnS nanoflakes feature broadband spectral responses from 355 nm to 1550 nm. The responsivity and detectivity can approach up to 1.28 × 103 A W−1 and 3.02 × 1011 Jones, respectively, under the ultraviolet laser of 355 nm. The devices also exhibit excellent NIR photodetection with a speciﬁc responsivity of 69 A W−1 towards the 1550 nm regime. Our research represents an important step toward scalable fabrication of the SnS nanoflakes and this method may pave a path for the future commercialization of flexible broadband optoelectronic devices.
High voltage trench insulated gate bipolar transistor with MOS structure for self-adjustable hole extraction
Authors: Zhao Yishang , Li Zehong , Peng Xin , Yang Yang , Zeng Xiao , Ren Min , Zhang Jinping , Gao Wei , Zhang Bo
Published: August 2020

In this letter, a novel high voltage trench insulated gate bipolar transistor (IGBT) with MOS structure for self-adjustable hole extraction (MOS-SH-IGBT) is proposed. It features the adjustable hole path (AHP) region controlled by the MOS structure. The AHP region stores holes during on-state, extracts holes swiftly to reduce switching loss during turn-off and provides an extra hole path to avoid latch-up during short-circuit. Because of shielding effects of the AHP region, MOS-SH-IGBT could also increase breakdown voltage (BV) and decrease Miller capacitance. Based on simulated results, the BV of the proposed device is increased by 10% compared with the conventional separate floating P-base IGBT. Furthermore, the Miller capacitance and switching loss of MOS-SH-IGBT are decreased by 64% and 29%, respectively. As for the same E
on of 117.3mJ cm−2, the dIce/dt of the MOS-SH-IGBT is decreased by 38.7%, and for the same E
off of 64.1mJ cm−2, the |dIce/dt| is decreased by 23.4%, which realizes lower EMI noise.
Dynamic noninvasive imaging through turbid media under low signal-noise-ratio
Authors: Yuan Yuan , Chen Hui
Published: August 2020

In turbid media, scattering of light scrambles information of the incident beam and represents an obstacle to optical imaging. Noninvasive imaging through opaque layers is especially challenging for reliable image reconstruction and dynamic objects. We here propose a solution to these problems: rather than using the full point-spread function or its Fourier transform (optical transfer function, OTF), the wave distortions in scattering layers can be characterized and diffraction-limited imaging performed using only the phase of OTF. Based on this understanding, we develop a method that exploits the redundant information from multiple measurements, which reliably yields OTF phases within several iterations. This method enables noninvasive imaging through turbid media with low signal-to-noise ratios in the measurements, which is not possible with previous methods. We then demonstrate noninvasive video imaging of a moving object hidden between scattering layers at 25–200 Hz. This imaging approach may inspire many other applications in scattering materials.
An ultra-compact x-ray free-electron laser
Authors: Rosenzweig J B , Majernik N , Robles R R , Andonian G , Camacho O , Fukasawa A , Kogar A , Lawler G , Miao Jianwei , Musumeci P , Naranjo B , Sakai Y , Candler R , Pound B , Pellegrini C , Emma C , Halavanau A , Hastings J , Li Z , Nasr M , Tantawi S , Anisimov P. , Carlsten B , Krawczyk F , Simakov E , Faillace L , Ferrario M , Spataro B , Karkare S , Maxson J , Ma Y , Wurtele J , Murokh A , Zholents A , Cianchi A , Cocco D , van der Geer S B
Published: August 2020

In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are: advanced, high gradient acceleration techniques, and x-ray free electron lasers (XFELs). Further, there is intense interest in the marriage of these two fields, with the goal of producing a very compact XFEL. In this context, recent advances in high gradient radio-frequency cryogenic copper structure research have opened the door to the use of surface electric fields between 250 and 500 MV m−1. Such an approach is foreseen to enable a new generation of photoinjectors with six-dimensional beam brightness beyond the current state-of-the-art by well over an order of magnitude. This advance is an essential ingredient enabling an ultra-compact XFEL (UC-XFEL). In addition, one may accelerate these bright beams to GeV scale in less than 10 m. Such an injector, when combined with inverse free electron laser-based bunching techniques can produce multi-kA beams with unprecedented beam quality, quantified by 50 nm-rad normalized emittances. The emittance, we note, is the effective area in transverse phase space (x, p

x
/m
e
c) or (y, p

y
/m
e
c) occupied by the beam distribution, and it is relevant to achievable beam sizes as well as setting a limit on FEL wavelength. These beams, when injected into innovative, short-period (1–10 mm) undulators uniquely enable UC-XFELs having footprints consistent with university-scale laboratories. We describe the architecture and predicted performance of this novel light source, which promises photon production per pulse of a few percent of existing XFEL sources. We review implementation issues including collective beam effects, compact x-ray optics systems, and other relevant technical challenges. To illustrate the potential of such a light source to fundamentally change the current paradigm of XFELs with their limited access, we examine possible applications in biology, chemistry, materials, atomic physics, industry, and medicine—including the imaging of virus particles—which may profit from this new model of performing XFEL science.
Energy correction based on fluorescence attenuation of DAMPE
Authors: Wu Li-Bo , Zhang Yun-Long , Zhang Zhi-Yong , Wei Yi-Feng , Wen Si-Cheng , Dai Hao-Ting , Liu Cheng-Ming , Wang Xiao-Lian , Xu Zi-Zong , Huang Guang-Shun
Published: August 2020

The major scientific goals of the DArk Matter Particle Explorer (DAMPE) are to study cosmic-ray electrons (including positrons) and gamma rays from 5 GeV to 10 TeV and nuclei from Z = 1 to 26 up to 100 TeV. The deposited energy measured by the Bismuth Germanate Oxide (BGO) calorimeter of DAMPE is affected by fluorescence attenuation in BGO crystals that are 600 mm long. In this work, an in-orbit attenuation calibration method is reported, and energy correction of the sensitive detector unit of the BGO calorimeter is also presented.
Long-period eclipsing binaries: towards the true mass-luminosity relation. I. the test sample, observations and data analysis
Authors: Kniazev Alexei Yu. , Malkov Oleg Yu. , Katkov Ivan Yu. , Berdnikov Leonid N.
Published: August 2020

The mass-luminosity relation is a fundamental law of astrophysics. We have suggested that the currently used mass-luminosity relation is not correct for the M/M
⊙ > 2.7 range of mass since it was created utilizing double-lined eclipsing binaries, where the components are synchronized and consequently change each other’s evolutionary path. To exclude this effect, we have started a project to study long-period massive eclipsing binaries in order to construct radial velocity curves and determine masses for the components. We outline our project and present the selected test sample together with the first HRS/SALT spectral observations and the software package, Fitting Binary Stars (fbs), that we developed for the analysis of our spectral data. As the first result, we present the radial velocity curves and best-fit orbital elements for the two components of the FP Car binary system from our test sample.
Investigation of the parameters of spiral pattern in galaxies: the arm width
Authors: Mosenkov Aleksandr , Savchenko Sergey , Marchuk Alexander
Published: August 2020

In this work, we determine the parameters of spiral structure for a sample of face-on spiral galaxies. In practice, the solution to this problem is a hard task because of the diversity of observed characteristics associated with spiral structure, such as the number of arms, their shape, arm contrast, etc. We study spiral structure in galaxies based on an analysis of photometric cuts perpendicular to the arm direction. The method is based on an approximation of these slices with an analytical function and derivation of the parameters of spiral structure (arm width, asymmetry, pitch angle) using the fitted parameters from this approximation. The algorithm has been applied to a sample of 155 galaxies selected from the Sloan Digital Sky Survey in different passbands. In this paper, we only consider the results on arm width: most spirals exhibit an increase in their width with galactocentric distance. Only 14 per cent of galaxies in our sample show an opposite trend or have an almost constant arm width at all radii.
Influence of the convective mixing-length parameter α on the chemical abundances in the case of metal-poor giant HD 122563
Authors: Song Nan , Alexeeva Sofya , Zhao Gang
Published: August 2020

One-dimensional (1D) model atmospheres are still the most commonly used tool for the determination of stellar chemical composition. Convection in the model is usually treated by mixing-length theory (MLT). The mixing-length parameter α is generally calibrated from the Sun and applied to all other stars. The metal-poor giant, HD 122563, is an important benchmark star to test stellar atmosphere and interior physics. We investigate the influence of the convection mixing-length parameter α on the determination of chemical abundances of Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, Sr, Y, Zr and Ba in the case of HD 122563, taking advantage of a high resolution and high signal-to-noise ratio HARPS spectrum. The abundance discrepancies Δ[X/H] that occur due to α variation rarely exceed 0.05 dex and most are less than 0.03 dex. We calculate the discrepancy Δ[X/H] using a line-by-line differential analysis. The abundance discrepancies do not have direct relation with either line strength or the excitation potential. For 1D stellar atmospheric analysis of HD 122563, the accuracy of abundance determination does not strongly depend on the choice of mixing-length parameter α (causing average discrepancies of < 0.03 dex), while the uncertainties in the effective temperature and surface gravity play a more important role.
Neutrino spin-flavor oscillations in solar environment
Authors: Joshi Sandeep , Jain Sudhir R.
Published: August 2020

We study the phenomenon of neutrino spin-flavor oscillations due to solar magnetic fields. This allows us to examine how significantly the electron neutrinos produced in the solar interior undergo a resonant spin-flavor conversion. We construct analytical models for the solar magnetic field in all the three regions of the Sun. Neutrino spin-flavor oscillations in this magnetic field are examined by studying the level crossing phenomenon and comparing the two cases of zero and non-zero vacuum mixing respectively. Results from the Borexino experiment are used to place an upper limit on the magnetic field in the solar core. Related phenomena such as effects of matter on neutrino spin transitions and differences between Dirac and Majorana transitions in the solar magnetic fields are also discussed.
Detection of hydroxyacetone in protostar IRAS 16293-2422 B
Authors: Zhou Yan , Quan Dong-Hui , Zhang Xia , Qin Sheng-Li
Published: August 2020

Hydroxyacetone (CH3COCH2OH) is one of the smallest molecules that contain both hydroxyl and carbonyl group on neighboring carbon atoms. This steric configuration is characteristic of saccharides and determines their biochemical activity. The attempt to search for hydroxyacetone toward the massive star formation region Sagittarius B2(N) was unsuccessful. Here we report the first detection of CH3COCH2OH in the solar-type protostar IRAS 16293–2422 B, using the Atacama Large Millimeter Array science verification data at Band 4. In a total of 11 unblended transitions of CH3COCH2OH with upper level energies ranging from 86 to 246 K are identified. From our local thermodynamic equilibrium analysis, we derived that the rotational temperature of CH3COCH2OH is 160±21 K and the column density is (1.2±1.0) ×1016 cm−2, which results in a fractional abundance of 7×10−10 with respect to molecular hydrogen. In this work, we present the identification of CH3COCH2OH in IRAS 16293–2422 B and propose a simple formation mechanism. The unambiguous identification of hydroxyacetone may provide the basis for future study of the origin and evolution of saccharides in the interstellar medium.
Inversion of Venus internal structure based on geodetic data
Authors: Xiao Chi , Li Fei , Yan Jian-Guo , Hao Wei-Feng , Harada Yuji , Ye Mao , Barriot Jean-Pierre
Published: August 2020

Understanding the internal structure of Venus promotes the exploration of the evolutionary history of this planet. However, the existing research concerning the internal structure of Venus has not used any inversion methods. In this work we employed an inversion method to determine the internal structure of Venus using observational or hypothetical geodetic data; these data include mass, mean radius, mean moment of inertia and second degree tidal Love number k
2. To determine the core state of Venus, we created two models of Venus, an isotropic 3-layer model with entire liquid core and an isotropic 4-layer model with liquid outer core and a solid inner core, assuming that the interior of Venus is spherically symmetric and in hydrostatic equilibrium. A series of the sensitivity analysis of interior structure parameters to the geodetic data considered in here shows that not all of the parameters can be constrained by the geodetic data from Venus. On this basis, a Markov Chain Monte Carlo algorithm was used to determine the posterior probability distribution and the optimal values of the internal structure parameters of Venus with the geodetic data. We found that the 3-layer model is more credible than the 4-layer model via currently geodetic data. For the assumption of the 3-layer model with the k
2 = 0.295 ± 0.066, I/MR
2 = 0.33 ± 0.0165, and

ρ
¯

=
5242.7
±
2.6

kgm−3, the liquid iron-rich core of Venus has a radius of

3294

−
261

+
215

km, which suggests a larger core than previous research has indicated. The average density of the mantle and liquid core of Venus are

4101

−
375

+
325

and

11885

−
1242

+
955

kgm−3, respectively.
Age and chemical composition of the globular cluster NGC 6652
Authors: Sharina Margarita Eugene , Shimansky Vladislav Vladimirovich
Published: August 2020

We present the results of determination of the age, helium mass fraction (Y), metallicity ([Fe/H]), and abundances of the elements C, N, O, Na, Mg, Ca, Ti, C and Mn for the Galactic globular cluster NGC 6652. We use its medium-resolution integrated-light spectrum from the library of Schiavon and our population synthesis method to fulfill this task. We select the evolutionary isochrone and stellar mass function for our analysis, which provide the best approximation to the shapes and intensities of the observed Balmer line profiles. The determined elemental abundances, age and metallicity are characteristic of stellar populations in the Galactic Bulge.
NLTE analysis of high-resolution H-band spectra IV: neutral copper
Authors: Xu Xiao-Dong , Shi Jian-Rong , Zhang Jun-Bo , Zhou Ze-Ming
Published: August 2020

To obtain reliable Cu abundances with the APOGEE H-band spectra, it is important to investigate the non-local thermodynamic equilibrium (NLTE) effects on the formation of the H-band Cu I lines. In addition, the Cu atomic model needs to be tested. Based on both the high-resolution and high signal-to-noise ratio H-band spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) and optical data, we derived the LTE and NLTE copper abundances of 13 FGK sample stars with the spectral synthesis method. We find that the NLTE effects are negligible for the Cu I 16005.7Å line in the IR H-band. Consistent copper abundances within the uncertainties from these two sets of lines have been obtained, which indicates the reliability of our NLTE copper atomic model. We note that the [Cu/Fe] ratios increase with increasing metallicity when ∼ – 1.4 dex < [Fe/H] < ∼ – 0.5 dex, favoring a secondary (metallicity-dependent) copper production.
Eclipsing binary XZ CMi in a hierarchical quadruple system
Authors: Wang Zhi-Hua , Zhu Li-Ying
Published: August 2020

The new complete BVRcIc
light curves and spectra of the short-period eclipsing binary XZ CMi are presented. The results from the combined analysis based on the photometric and spectroscopic data show that XZ CMi is a near contact binary with the secondary component filling its critical Roche lobe while the primary filling 91% of its Roche lobe. The investigation of the O – C diagram reveals that its orbital period is continuously increasing, which is consistent with the derived configuration and caused by the mass transfer from the less massive star to the more massive one. In addition, an obvious periodic modulation with the amplitude of0.0187(±0.0016) d and a high eccentric of 0.86(±0.04) is detected, which could be the results of the light time effect as a third star with the mass no less than 0.42(±0.09) M
⊙ orbiting around the central eclipsing binary once every 95.7(±2.1) yr. Furthermore, we found a visual companion star at 2.4” east by south of this system at a much greater distance by direct image. The large third light contribution found from the light curve analysis could be well explained by the existence of the third star and the fourth visual one. The similar parallax and proper motion imply that the components of this hierarchical quadruple system might be bounded by gravitation. Spectroscopic observations for two visual components were carried out by the LAMOST and 2.16 m telescopes, respectively. Their different values of [Fe/H] suggest that they were not born from the same origin. Thus, XZ CMi system is an interesting and important target to study the formation of the multiple stars.
Effect of induced magnetic field and linear / non-linear vertical stretching sheet on mixed convection Jeffrey fluid near a stagnation-point flow through a porous medium with suction or injection
Authors: Katyayani G. , Lakshmi Devi R.
Published: August 2020

The present study deals with the effect of induced magnetic field on mixed convective near a stagnation point flow with linear / non-linear vertical stretching sheet of Jeffrey fluid flow through porous medium in the presence of slip flow regime. The set of governing non-linear coupled partial differential equations are transformed into a set of non-linear coupled ordinary differential equations using suitable similarity transformations, which are then solved numerically using Runge-Kutta fourth order in association with shooting technique in MATLAB. The effects of non-dimensional parameters such as Jeffrey parameter, magnetic force number, magnetic Prandtl number, magnetic parameter, suction/injection parameter, slip velocity parameter, linear or non-linearity parameter, permeability parameter, velocity ratio parameter, Prandtl number, thermal radiation parameter and Eckert number on velocity, induced magnetic field and temperature are presented graphically while the skin friction and local Nusselt number are represented numerically.
Dynamical analysis of a discrete fractional order prey-predator system incorporating a prey refuge with Holling type II response
Authors: George Maria Selvam A , Janagaraj R , Jacintha Mary
Published: August 2020

In this present work, a class of Fractional Order Predator-Prey System (FOPP) in discrete time with Holling type II functional response incorporating a prey refuge of the form

x
(
i
+
1
)
=
x
(
i
)
+

h
v

Γ
(
1
+
v
)

[

r
x
(
i
)
−
r

x
2

(
i
)
−
a

(

(

1
−
μ

)

x
(
i
)

(

1
−
μ

)

x
(
i
)
+
b

)

y
(
i
)

]

y
(
i
+
1
)
=
y
(
i
)
+

h
v

Γ
(
1
+
v
)

[

−
c
y
(
i
)
+
d

(

(

1
−
μ

)

x
(
i
)

(

1
−
μ

)

x
(
i
)
+
b

)

y
(
i
)

]

is considered. The stability of the proposed system is discussed by analyzing the characteristic equation at the equilibrium points along with the existence, uniqueness, non-negativity and boundedness of the solutions. Theoretical findings are supported by numerical examples and enhanced by pictorial representations such as time series, bifurcation diagrams and phase portraits.
Chirality and small scale effects on embedded thermo elastic carbon nanotube conveying fluid
Authors: Mahaveersree Jayan M , Selvamani R
Published: August 2020

This paper presents the mechanical buckling properties of fluid conveying thermo elastic embedded single walled carbon nanotube (SWCNT) with small scale and chirality effect. The analytical formulation is developed based on Eringen’s non local elasticity theory. The nonlocal form of governing equations that contains partial differential equations for (SWCNT) single walled carbon nanotube is derived by considering thermal and chirality effect. The analytical solution is obtained by using Euler–Bernoulli beam theory. The equivalent Young’s modulus and shear modulus of chirality SWCNT is derived. The computed non dimensional wave frequency, phase velocity and group velocity are presented in the form of dispersion curves and the physical characteristic are studied.
Thermo piezoelectric sound waves in a nanofiber using Timoshenko beam theory incorporated with surface effect
Authors: Rexy J , Selvamani R , Anitha L
Published: August 2020

This study investigates that the sound wave propagation of Nanofibers under the influence of surface effect via piezo thermo elasticity using Timoshenko form of beam equation. The equation of analytical model is obtained for Nanofiber through shear and rotation effect. Curves are drawn for frequency, phase velocity, piezoelectric strain and dynamic displacement at different vibration modes of Nanofibers. From the result obtained, it is seen that the surface effect gives significant contribution to the physical variables. The presented study is expected to be more helpful for the design of piezo-thermo-mechanical Nanofiber-based devices.
Bending analysis of generalized thermoelastic waves in a multilayered cylinder using theory of dual phase lagging
Authors: Mahesh S , Selvamani R
Published: August 2020

In this present problem, we construct the analytical model for wave propagation in a generalized thermoelastic multilayered composite hollow cylinder construct of inner and outer viscothermo layer fastened together by linear Elastic materials with voids (LEMV). To uncouple the equation of motion, and heat conduction equations, displacement potential functions are introduced. The frequency equations are derived for longitudinal and flexural modes of vibration and are studied numerically for heat conducting viscothermoelastic material. The computed dimensionless frequency is presented in the form of scattering curves against various physical variables. Adhesive layer LEMV is compared with Carbon Fiber Reinforced Polymer (CFRP).We found that the frequency wave characteristics are more in physical variables in the presence of thermal parameter.
A study on Zalcman conjecture and third Hankel determinant
Authors: Suman Kumar V , Sharma R B
Published: August 2020

In this present work, we define a new subclass of holomorphic functions denoted by Re
. We estimate an upperbound of

|

H
3

(
1
)

|

,

|

a
3
2

−

a
5

|

for the function f in these classes associated with exponential function. Also we estimate an upperbound of coefficient inequality for the functions

(
f
*
g
)
,

f

−
1

and

z

f
(
z
)

.
Fuzzy triangular numbers in - Sierpinski triangle and right angle triangle
Authors: Sudha T , Jayalalitha G
Published: August 2020

Sierpinski Triangle or Sierpinski Gasket or Sierpinski Sieve is a fractal and attractive fixed set with the overall shape of an equilateral triangle, subdivided recursively into smaller equilateral triangles. In this paper the number theoretical aspect of Fuzzy Triangular Numbers (FTN) in Sierpinski Triangle and Right Angle Triangle have been established and some arithmetic operations of α – Cut, Centroid of the Triangle, Approximation of the Triangular Fuzzy Numbers are explained.
Radio analytic mean labeling of some graphs
Authors: Poomalai P , Vikramaprasad R , Malliga P
Published: August 2020

A Radio Analytic mean Labeling of an associated diagram G is a balanced guide V from the vertex set v(G) to the arrangement of z^+ with the end goal that for any two distinct vertices x and y of G.

d
(
x
,
y
)
+

⌈

|

(
f
(
u
)
)
−
(
f
(
v
)
)

|

2

⌉

≥
1
+
diam G

. The Radio Analytic mean number of n, RAMN (n) is the greatest number relegated to any vertex of G. The Radio Analytic mean number of G, is the least value of RAMN(n) taken over all Radio Analytic mean labeling n of G. In this paper we locate the radio Analytic mean number of splitting of Bistar graph, standing graph, wheel graph.
Hyers-Ulam stability of first order linear differential equation using Fourier transform method
Authors: Mohanapriya A , Ganesh A
Published: August 2020

This research paper aims to identify and also tries to prove differential equation of first order that has Hyers-Ulam and Generalized Hyers-Ulam stability by inducing Fourier Transform method.The analysis of the Hyers-Ulam stability had resulted in providing a constant value for homogeneous and non-homogeneous differential equation with implementation of Fourier transform. In order to prove these facts, few application of non-homogeneous linear differential equation in connect with the main results are provided.
The Fourier transform approach to Hyers-Ulam stability of differential equation of second order
Authors: Mohanapriya A , Ganesh A , Gunasekaran Nallappan
Published: August 2020

The use of Fourier transform has increased in the light of recent events in different application. Fourier transform is also seen as the easiest and an effective way among the other transformation. In line with this, the research deals with the Hyers-Ulam stability of second order differential equation using Fourier transform. The study aims at deriving a generalized Hyers-Ulam results for second order differential equations with constant co-efficient

H
″
(
v
)
+
a
H
′
(
v
)
+
b
H
(
v
)
=
r
(
t
)

with the help of Fourier Transform.
Exponential mean labeling of some graphs obtained from duplicating operations
Authors: Rajesh Kannan A , Manivannan P , Durai Baskar A
Published: August 2020

In this manuscript, we have examined the exponential mean labeling of some graphs obtained from duplicating operations.
Exponential meanness of some ladder related graphs
Authors: Rajesh Kannan A , Ratha Jeyalakshmi R , Manivannan P , Durai Baskar A
Published: August 2020

For a graph G = (V, E) define an injective function χ from V (G) to the set {1, 2, 3…, q + 1} and an induced bijective function χ* from E(G) to the set {1, 2, 3…, q} as

χ
*
(
u
v
)
=

⌊

1
e

(

χ

(
v
)

χ
(
v
)

χ

(
u
)

χ
(
u
)

)

1

χ
(
v
)
−
χ
(
u
)

⌋

,

for all

u
v
∈
E
(
G
)
.

Then χ is called an exponential mean labeling of G. A graph which allows an exponential mean labeling is called an exponential mean graph. In this article, we discuss an exponential mean labeling of some ladder graphs.
Operation -regular spaces, normal spaces with α
(γ, γ′)-open sets in topological spaces
Authors: Kalaivani N , Saravanakumar D
Published: August 2020

In this paper the α
(γ, γ′)-regular spaces, α
(γ, γ′)-normal spaces have been introduced also some of its properties have been studied.
β

ee0-excellence in graphs
Authors: Lakshmanaraj D , Muthusubramanian L , Swaminathan V
Published: August 2020

The concept of equitability was first introduced by W. Meyer in his paper titled Equitable Coloring[4]. In this paper, cardinality equitability between color classes was considered. Prof. E. Sampathkumar introduced the concept of degree equitability for vertices in a graph. Several types of equitability have been considered[1][2]. External equitability has been introduced in [3]. A subset T of the vertex set V of a graph G, one can define externally equitable, that is, if for any x,y in the complement of T, ‖N(x)∩T|−N(y)∩T‖ ≤ 1. A subset S of the vertex set of a graph is externally equitably independent if S is independent and S is externally equitable. The maximum cardinality of an externally equitable and independent set is denoted by

β
0

e
e

(
G
)

and an externally equitable and independent set with cardinality

β
0

e
e

(
G
)

is called a

β
0

e
e

(
G
)

-set of G. A vertex u is said to be

β
0

e
e

(
G
)

-good if u belongs to a

β
0

e
e

(
G
)

-set of G. If every vertex of G is

β
0

e
e

(
G
)

-good, then G is said to be

β
0

e
e

-excellent graph. In this paper, this concept is introduced and studied.
Linear modal analysis of ring shaped - elliptical plate using finite element method
Authors: Suganthi G , Karthikeyan S
Published: August 2020

In this paper, the wave propagation of a transversely isotropic thin ring - shaped elliptical plate made up of piezo electric material is considered. The surfaces are assumed to be traction free and coated with electrodes. The trail functions are introduced to uncouple the equations of motion and electric property. A computer program solving the finite element method (FEM) is developed and the numerical calculations are given for an array of six-noded shell elements. The non-dimensionalized natural frequencies of the elliptical plate in different wave numbers under different boundary condition for symmetric and antisymmetric modes are calculated and are plotted as dispersion curves. The proposed model is effective and simple and can be applied to problems with exact solution or a finite element approximation to the governing equations.
Stability of an non-additive functional equation
Authors: Govindan Vediyappan , Gunasekaran Nallappan , Pinelas Sandra
Published: August 2020

In this paper, the authors investigated the general solution and generalized Hyers-Ulam stability of Non additive functional equation of the form Ω(2θ
1±θ
2±θ
3) + 2Ω(θ
2) + 2Ω(θ
3) = 2Ω(θ
1±θ
2) + 2Ω(θ
1±θ
3) + Ω(θ
2±θ
3) in Banch space using direct and fixed point methods.
Eccentric connectivity polynomial [ECP] of some standard graphs
Authors: Rajeshwari M , Itagi Huilgol Medha
Published: August 2020

Eccentric connectivity index of a graphGdenoted byξc(G), can be defined asξc(G)=∑v∈V(G)degG(v).ecc(v)heredeqG(v) represents the vertex degree ofvinGand andecc(v) =max[(x,v)//x∈V(G)] eccentricity ofv, is the distance to a farthest vertex fromvand it is denoted byξc(G). Also corresponding Eccentric connectivity polynomial [ECP] is denoted byECP(G,x) is given by,ECP(G,x)=∑v∈V(G)degG(v).xeccv. This paper consists of Eccentric Connectivity polynomial [ECP] of some standard graphs and for some class of graphs.
Uniqueness along with value distribution of q-shift linear difference polynomials
Authors: Harina Waghamore P , Anand Sangeetha
Published: August 2020

This research article investigates the value distribution of linear difference polynomial

L
(
ϕ
)
=

∑

j
−
1

s

b
j

ϕ
(

q
j

z
+

c
j

)

where

b
j

,

c
j

∈
ℂ

. We look into the uniqueness problems when two difference products of entire functions share one value with finite weight. Our results generalizes the previous theorems of existing studies.
NS(WG) separation axioms in Neutrosophic topological spaces
Authors: Suresh R , Palaniammal S
Published: August 2020

Smarandache presented and built up the new idea of Neutrosophic concepts from the Neutrosophic sets. A.A. Salama presented Neutrosophic topological spaces by utilizing the Neutrosophic sets. Point of this paper is we present and concentrate the Neutrosophic topological spaces. Neutrosophic wgTg spaces, Neutrosophic wgTα spaces and Neutrosophic wgTαg spaces and its Properties are talked about subtleties.
Numerical simulation on mixed magneto-convection in a tilted lid-driven box with sinusoidal heating
Authors: Sivasankaran S , Alshomrani Ali S , Alshumrani Majed
Published: August 2020

An unsteady combined convective flow and energy transfer in an inclined lid-driven square box with sinusoidal boundary temperatures at the vertical sidewalls in the presence of uniform magnetic field is numerically investigated. The horizontal sides of the box are thermally insulated. The governing equations are numerically solved by using finite difference method. The results are discussed for various groupings of the governing parameters, inclination angle, phase deviation, amplitude ratio, Richardson number and Hartmann number. The sinusoidal heating provides a higher energy transfer than a constant thermal distribution while the amplitude ratio can be raised to attain such heat distribution along any sidewall of the box.
On Pseudo-slant sub-manifolds of generalised sasakian space form
Authors: Bhavya K , Somashekhara G
Published: August 2020

In this article, we investigate pseudo-slant sub-manifold (PSSM) of generalised sasakian space form(GSSF). We obtain some integrability aspects of the distributions on the PSSM.
Star-rainbow coloring in some corona product graphs
Authors: Sunita Jagannatharao Kulkarni , Murali R
Published: August 2020

A “rainbow connected graph” is a connected graph in which every pair of distinct vertices in it has a rainbow path, in the sense that no two edges in this path are colored the same. The rainbow connection number of a connected graph G, denoted by rc(G), is the “minimum” number colors necessary to color G such that it has a rainbow path between every pair of its vertices. Further, G is said to be star-rainbow colored if every path on four vertices in it is rainbow colored. The “minimum” number of colors that are necessary to color G such that it is star-rainbow colored is called the “star-rainbow connection number” of G, denoted by strrc(G). In this article, we consider some corona product graphs involving Pn
, Kn
, Cn
and K
1,n
and find strrc(G) for such graphs.
Status of CME Search Before Isobar Collisions and Methods of Blind Analysis From STAR
Authors: Tribedy Prithwish
Published: August 2020

The STAR collaboration is currently pursuing the blind analysis of the data for isobar collisions that was performed at RHIC in the year 2018 to make a decisive test of the Chiral Magnetic Effect (CME). Why is it so difficult to detect signals of CME in the experiment? Do we really understand different sources of background? Why observing similar charge separation between p/d + A and A + A does not stop us from pursuing the search for CME? In this contribution, I attempt to address some of these questions and briefly outline a few recent STAR analyses based on new methods and observables to isolate the possible CME-driven signal and non-CME background contributions at the top RHIC energy. Finally, I describe the procedure for the blind analysis of the isobar data. An outstanding question remains – what happens if we go down in energy? I address this by discussing how the new event-plane detector (EPD) upgrade provides a new capability at STAR towards CME search using the data from the RHIC BES-II program.
Probing the QCD phase structure using event-by-event fluctuations
Authors: Nayak Tapan K.
Published: August 2020

Heavy-ion collisions at relativistic energies probe matter at extreme conditions of temperatures and energy densities. The study of event-by-event fluctuations of experimental observables is crucial to probe the QCD phase transition, locate the critical point, and learn about the associated critical phenomena. At the critical point, all thermodynamic quantities behave anomalously. Fluctuation measurements provide access to thermodynamic response functions. We discuss the methods for obtaining the isothermal compressibility using particle multiplicity fluctuation, and specific heat using fluctuations in mean transverse momentum, temperature, and energy. Lattice QCD calculations have predicted non-monotonic behavior in the higher-order cumulants of conserved quantities at the critical point. Fluctuations in the multiplicity of charged to neutral particles have been measured to understand the formation of domains of disoriented chiral condensates. We review the recent fluctuation results as a function of collision centrality and energy from experiments at SPS, RHIC, and LHC. In addition, we propose to map the temperature fluctuations in η-φ plane to probe local fluctuations of temperature and energy density.
The QCD transition line from lattice simulations
Authors: Ratti Claudia , Bellwied Rene , Borsanyi Szabolcs , Fodor Zoltan , Guenther Jana N. , Kara Ruben , Katz Sandor , Parotto Paolo , Pasztor Attila , Szabo Kalman
Published: August 2020

We present our new results for the QCD transition line at finite chemical potential μB
from first principle, lattice QCD simulations. We extrapolate our results from imaginary chemical potentials, up to

μ
B

≈
300
​

MeV

. We obtain the most precise value for the transition temperature, the curvature of the QCD phase diagram and its fourth order correction. The results are continuum extrapolated, based on Nt
= 10, 12, 16 lattices. We also study the height and width of the peak of the chiral susceptibility and how they change with increasing chemical potential. We find that both of them are consistent with a constant, which does not indicate any criticality in our explored
New channels of prompt-photon production by magnetic fields in heavy-ion collisions
Authors: Ayala Alejandro , David Castaño-Yepes Jorge , Dominguez Jimenez Isabel , Salinas San Martín Jordi , Elena Tejeda-Yeomans María
Published: August 2020

In this work I present recent results on the photon yield and elliptic flow coefficient in relativistic heavy-ion collisions for different centralities. In our calculation, we take into account gluon fusion and splitting channels which become available due to an intense and short-lived magnetic field. We show that with reasonable values for the saturation scale, our calculation helps to better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum at different centralities.
Direct photon production and scaling properties in large and small system collisions
Authors: Khachatryan Vladimir
Published: August 2020

We present recent measurement results of low momentum direct photons obtained by the PHENIX collaboration from Cu+Cu at 200 GeV and Au+Au at 200 GeV, 62.4 GeV, 39 GeV, as well as from p+p and p+Au at 200 GeV. In these measurements a large excess over the scaled reference p+p yield of direct photons is observed in A+A collisions, and a non-zero excess over the scaled p+p yield is found within systematic uncertainties in central p+Au collisions. Based upon the comparison between this recent data and the PHENIX published Au+Au data at 200 GeV, along with including the ALICE Pb+Pb data at 2760 GeV, PHENIX has found that the direct photon pT-spectra and their integrated yield, dNγ
/dy, above 1 GeV/c in pT follow a universal scaling as a function of the charged-hadron multiplicity, (dNch
/dρ])
α
, with α = 1.25. Within experimental uncertainties, the direct photon scaling properties observed in large collision systems is independent of the colliding species, collision centrality selection and center-of-mass energy. One possible explanation is that the photon radiation sources may have similar properties for all colliding large systems across different energies. There is also another trend coming from integrated direct photon pT-spectra of small systems, which suggests that the QGP turn off/on transition region may exist between large and small system collisions.
Status of the MPD Experiment at JINR
Authors: Kisiel Adam
Published: August 2020

The Mega-Science project NICA (Nuclotron-based Ion Collider fAcility) is under construction at the Joint Institute for Nuclear Research (JINR) in Dubna. The Multi-Purpose Detector (MPD) is part of this complex, as a main physics experiment operating there. It aims to study the phase diagram of QCD matter at maximum baryonic density, determine the nature of the phase transition between the deconfined and hadronic matter and perform a search for the conjectured critical point in the diagram. Status of the preparation of critical elements of the infrastructure will be discussed, including the construction of the MPD subsystems.

The designed physics performance of the detector components will be discussed. Spectra of identified hadrons, including hyperons and hypernuclei will be discussed, with emphasis on differential measurement and total yield extraction. The quality of directed and elliptic flow determination will be discussed, with comparison to model expectations. The sensitivity of event-by-event fluctuations and femtoscopic measurements to the nature of the phase transition and the presence of a critical point will be given. Performance of the electromagnetic calorimeter working in conjunction with the tracking system for the di-lepton measurements and the potential for identification of charmed mesons will be described. In summary, all the main components of the physics program of the MPD Collaboration will be presented.
Quark spin – thermal vorticity alignment and the

Λ,Λ¯

polarization in heavy-ion collisions
Authors: Ayala Alejandro , de la Cruz D. , Hernández L. A. , Hernández-Ortíz S. , Salinas J.
Published: August 2020

It has been proposed that the Λ and

Λ
¯

polarizations observed in heavy-ion collisions are due to the interaction between quark spin and thermal vorticity. In this work we report on a computation of the relaxation time required for this alignment to occur at finite temperature and baryon chemical potential, considering quarks with a finite mass. The calculation is performed after modelling the interaction by means of an effective vertex which couples the thermal gluons and quarks within the vortical medium. We show that the effect of the quark mass is to reduce the relaxation time as compared to the massless quark case. An intrinsic global polarization of quarks/antiquarks emerges which is shown to be linked with the

Λ
/

Λ
¯

polarization.
Calculation of ET
from single particle spectra
Authors: Nattrass Christine , Sharma Biswas , Sorensen Soren , Smith Ben , Mengel Tanner , Hughes Charles , Webb Nathan
Published: August 2020

In high energy heavy ion collisions, measurements of transverse energy (ET
) can constrain the initial energy density and therefore provide insight into the formation of the Quark Gluon Plasma (QGP). This is particularly interesting in regions where it is unclear if the QGP is formed. The ET
in a collision can be measured either from a calorimeter or calculated from the single particle momentum spectra. We use spectra measured by the STAR collaboration to calculate the transverse energy in heavy ion collisions in Au+Au collisions at

S

NN

=
7.7
−
200

GeV

. These calculations are compared to PHENIX measurements using a calorimeter.