cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Continued cooling of the crust in the neutron star low-mass X-ray binary KS 1731-260
Creators: name: Cackett, Edward M.
name: Brown, Edward F.
name: Cumming, Andrew
name: Degenaar, Nathalie
name: Miller, Jon M.
name: Wijnands, Rudy
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Some neutron star low-mass X-ray binaries have very long outbursts (lasting several years) which can generate a significant amount of heat in the neutron star crust. After the system has returned to quiescence, the crust then thermally relaxes. This provides a rare opportunity to study the thermal properties of neutron star crusts, putting constraints on the thermal conductivity and hence the structure and composition of the crust. KS 1731-260 is one of only four systems where this crustal cooling has been observed. Here, we present a new Chandra observation of this source approximately 8 years after the end of the last outburst, and 4 years since the last observation. We find that the source has continued to cool, with the cooling curve displaying a simple power-law decay. This suggests that the crust has not fully thermally relaxed yet, and may continue to cool further. A simple power law decay is in contrast to theoretical cooling models of the crust, which predict that the crust should now have cooled to the same temperature as the neutron star core.
description: Accepted to ApJ Letters
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ¸ Ð¿Ð¾ Ð¿Ð¾Ð²ÑÑÐµÐ½Ð¸Ñ ÑÑÑÐµÑÑÐ¾ÑÑÑÐ¾Ð¹ÑÐ¸Ð²Ð¾ÑÑÐ¸ ÑÑÐ¸ÑÐµÐ»Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Development of a methodology to increase teacher stress resistance
Creators: name: ÐÑÑÐ°ÑÐ¾Ð²Ð°, ÐÐºÐ°ÑÐµÑÐ¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÑÑÑÐµÑÑ
ÑÑÑÐµÑÑ-ÑÐ°ÐºÑÐ¾Ñ
ÑÑÑÐµÑÑÐ¾ÑÑÑÐ¾Ð¹ÑÐ¸Ð²Ð¾ÑÑÑ
ÑÑÑÐµÑÑÐ¾Ð²Ð°Ñ ÑÐµÐ°ÐºÑÐ¸Ñ
ÑÐ¼Ð¾ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ðµ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ
ÑÐ¼Ð¾ÑÐ¸Ð¸
Ð°Ð´Ð°Ð¿ÑÐ°ÑÐ¸Ñ
ÑÑÐ¸ÑÐµÐ»Ñ
stress
stress factor
resistance to stress
stress response
emotional state
emotions
adaptation
teachers

description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ Ð±ÑÐ»Ð¸ Ð¿ÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ñ Ð¿Ð¾Ð½ÑÑÐ¸Ðµ ÑÑÑÐµÑÑÐ°, ÑÑÑÐµÑÑ ÑÐ°ÐºÑÐ¾ÑÐ° Ð¸ ÑÑÑÐµÑÑÐ¾ÑÑÑÐ¾Ð¹ÑÐ¸Ð²Ð¾ÑÑÐ¸, Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ñ Ð¸Ñ ÑÐ°Ð·Ð½Ð¾Ð²Ð¸Ð´Ð½Ð¾ÑÑÐ¸ Ð¸ Ð²Ð»Ð¸ÑÐ½Ð¸Ðµ Ð½Ð° ÑÐ¼Ð¾ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ðµ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ Ð¿ÐµÐ´Ð°Ð³Ð¾Ð³Ð°. ÐÑÐ»Ð¸ ÑÐ°Ð·Ð¾Ð±ÑÐ°Ð½Ñ Ð¾ÑÐ½Ð¾Ð²Ð½ÑÐµ ÑÑÑÐµÑÑÐ¾ÑÑ, Ð¿ÑÐ¸ÑÑÑÑÑÐ²ÑÑÑÐ¸Ðµ Ð² ÑÐ°Ð±Ð¾ÑÐµÐ¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¿ÐµÐ´Ð°Ð³Ð¾Ð³Ð°. ÐÑÑÐµÐ¼ Ð°Ð½ÐºÐµÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð±ÑÐ»Ð° Ð¿Ð¾Ð´ÑÐ²ÐµÑÐ¶Ð´ÐµÐ½Ð° ÑÐµÐ¾ÑÐ¸Ñ Ð¾ ÑÐ¾Ð¼, ÑÑÐ¾ Ð²Ð¾Ð·Ð´ÐµÐ¹ÑÑÐ²Ð¸Ðµ ÑÑÑÐµÑÑ-ÑÐ°ÐºÑÐ¾ÑÐ¾Ð² Ð²Ð»Ð¸ÑÐµÑ Ð½Ð° ÑÐ¼Ð¾ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ðµ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ ÑÐ¿ÐµÑÐ¸Ð°Ð»Ð¸ÑÑÐ°. Ð ÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð¼ ÑÐ°Ð±Ð¾ÑÑ ÑÑÐ°Ð»Ð¸ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ ÑÑÐ°Ð±Ð¸Ð»Ð¸Ð·Ð°ÑÐ¸Ð¸ ÑÐ¼Ð¾ÑÐ¸Ð¾Ð½Ð°Ð»ÑÐ½Ð¾Ð³Ð¾ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ñ Ð¿ÐµÐ´Ð°Ð³Ð¾Ð³Ð¾Ð².
description: In this paper, we analyzed the concept of stress, stress factor and resistance to stress investigated their varieties and the impact on the emotional state of a specialist. The main stressors present in the work activities of the teachers specialist were disassembled. By questioning, the theory was confirmed that the effect of stress factors influences the emotional state of a specialist. The result of the work was rec-ommendations for stabilizing the emotional state of specialists in an school.
Probing the sensitivity of the total nucleus-nucleus reaction cross section at intermediate energies to medium effects and isospin asymmetries
Creators: name: Sammarruca, Francesca
name: White, Larz
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: This paper presents reaction cross section predictions. These predictions are the result of a continuous pipeline which originates from a microscopic nuclear interaction. Density parameters and effective nucleon-nucleon cross sections (both involved in the reaction calculations) are by-products of the same equation of state. First, we perform tests of sensitivity to medium effects using reactions involving 208-Pb, a stable but weakly isospin-asymmetric nucleus. We also show predictions for collisions of some neutron-rich isotopes of Calcium and Argon. We observe significant sensitivity of the reaction cross section to medium effects but very weak sensitivity to inclusion of isospin asymmetry in the effective nucleon-nucleon cross sections.
description: Accepted for publication in the Physical Review C
Improved cosmological constraints on the curvature and equation of state of dark energy
Creators: name: Pan, Nana
name: Gong, Yungui
name: Chen, Yun
name: Zhu, Zong-Hong
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We apply the Constitution compilation of 397 supernova Ia, the baryon acoustic oscillation measurements including the $A$ parameter, the distance ratio and the radial data, the five-year Wilkinson microwave anisotropy probe and the Hubble parameter data to study the geometry of the universe and the property of dark energy by using the popular Chevallier-Polarski-Linder and Jassal-Bagla-Padmanabhan parameterizations. We compare the simple $χ^2$ method of joined contour estimation and the Monte Carlo Markov chain method, and find that it is necessary to make the marginalized analysis on the error estimation. The probabilities of $Ω_k$ and $w_a$ in the Chevallier-Polarski-Linder model are skew distributions, and the marginalized $1σ$ errors are $Ω_m=0.279^{+0.015}_{-0.008}$, $Ω_k=0.005^{+0.006}_{-0.011}$, $w_0=-1.05^{+0.23}_{-0.06}$, and $w_a=0.5^{+0.3}_{-1.5}$. For the Jassal-Bagla-Padmanabhan model, the marginalized $1σ$ errors are $Ω_m=0.281^{+0.015}_{-0.01}$, $Ω_k=0.000^{+0.007}_{-0.006}$, $w_0=-0.96^{+0.25}_{-0.18}$, and $w_a=-0.6^{+1.9}_{-1.6}$. The equation of state parameter $w(z)$ of dark energy is negative in the redshift range $0\le z\le 2$ at more than $3σ$ level. The flat $Λ$CDM model is consistent with the current observational data at the $1σ$ level.
description: 10 figures, 12 pages, Classical and Quantum Gravity in press; v2 to match the pulished version
On the Fine-Grained Complexity of Small-Size Geometric Set Cover and Discrete $k$-Center for Small $k$
Creators: name: Chan, Timothy M.
name: He, Qizheng
name: Yu, Yuancheng
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computational Geometry (cs.CG)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: We study the time complexity of the discrete $k$-center problem and related (exact) geometric set cover problems when $k$ or the size of the cover is small. We obtain a plethora of new results: - We give the first subquadratic algorithm for rectilinear discrete 3-center in 2D, running in $\widetilde{O}(n^{3/2})$ time. - We prove a lower bound of $Ω(n^{4/3-δ})$ for rectilinear discrete 3-center in 4D, for any constant $δ>0$, under a standard hypothesis about triangle detection in sparse graphs. - Given $n$ points and $n$ weighted axis-aligned unit squares in 2D, we give the first subquadratic algorithm for finding a minimum-weight cover of the points by 3 unit squares, running in $\widetilde{O}(n^{8/5})$ time. We also prove a lower bound of $Ω(n^{3/2-δ})$ for the same problem in 2D, under the well-known APSP Hypothesis. For arbitrary axis-aligned rectangles in 2D, our upper bound is $\widetilde{O}(n^{7/4})$. - We prove a lower bound of $Ω(n^{2-δ})$ for Euclidean discrete 2-center in 13D, under the Hyperclique Hypothesis. This lower bound nearly matches the straightforward upper bound of $\widetilde{O}(n^ω)$, if the matrix multiplication exponent $ω$ is equal to 2. - We similarly prove an $Ω(n^{k-δ})$ lower bound for Euclidean discrete $k$-center in $O(k)$ dimensions for any constant $k\ge 3$, under the Hyperclique Hypothesis. This lower bound again nearly matches known upper bounds if $ω=2$. - We also prove an $Ω(n^{2-δ})$ lower bound for the problem of finding 2 boxes to cover the largest number of points, given $n$ points and $n$ boxes in 12D. This matches the straightforward near-quadratic upper bound.
description: Accepted to ICALP'23
Towards a derivation of holographic entanglement entropy
Creators: name: Casini, Horacio
name: Huerta, Marina
name: Myers, Robert C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We provide a derivation of holographic entanglement entropy for spherical entangling surfaces. Our construction relies on conformally mapping the boundary CFT to a hyperbolic geometry and observing that the vacuum state is mapped to a thermal state in the latter geometry. Hence the conformal transformation maps the entanglement entropy to the thermodynamic entropy of this thermal state. The AdS/CFT dictionary allows us to calculate this thermodynamic entropy as the horizon entropy of a certain topological black hole. In even dimensions, we also demonstrate that the universal contribution to the entanglement entropy is given by A-type trace anomaly for any CFT, without reference to holography.
description: 42 pages, 2 figures, few new ref's and comments added
Bushfire monitoring from space
Creators: name: De Préaumont Aliénor, Franck
Publisher: name: Zenodo
Year: 2022
Subjects: Fire Radiative Power
Lasso and Ridge Regression
SVM
MODIS
AMS
fire size
sub-pixel retrievals

description: Fire can be recognized as an essential climatic variable. Particularly disastrous in Australia during the Black Summer, authorities are trying to monitor the negative effects of the fire activity. A main indicator regarding the intensity of a fire is the Fire Radiative Power (FRP). In this paper, a prediction of the FRP value will be conducted, using a NASA dataset. Then an overview of the long term influence of this value will be done. Afterwards, in relation to the fire prevention, the correlation between the size of the fire and the FRP value will be studied. Finally a more precise analysis of the FRP value can be done using a subpixel-based calculation of the FRP value.
Experimental probes of emergent symmetries in the quantum Hall system
Creators: name: Lütken, C. A.
name: Ross, G. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Experiments studying renormalization group flows in the quantum Hall system provide significant evidence for the existence of an emergent holomorphic modular symmetry $Γ_0(2)$. We briefly review this evidence and show that, for the lowest temperatures, the experimental determination of the position of the quantum critical points agrees to the parts \emph{per mille} level with the prediction from $Γ_0(2)$. We present evidence that experiments giving results that deviate substantially from the symmetry predictions are not cold enough to be in the quantum critical domain. We show how the modular symmetry extended by a non-holomorphic particle-hole duality leads to an extensive web of dualities related to those in plateau-insulator transitions, and we derive a formula relating dual pairs $(B,B_d)$ of magnetic field strengths across any transition. The experimental data obtained for the transition studied so far is in excellent agreement with the duality relations following from this emergent symmetry, and rule out the duality rule derived from the ``law of corresponding states". Comparing these generalized duality predictions with future experiments on other transitions should provide stringent tests of modular duality deep in the non-linear domain far from the quantum critical points.
description: 12 pages, 9 figures
EFFECT OF Cu SUBSTITUTION ON THE STRUCTURE,  ELECTRICAL AND DIELECTRIC PROPERTIES OF Co-Ni FERRITE MATERIALS
Creators: name: ADANE BOGALE
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Synthesis  and characterization  of nanoparticles, which is less than 100 nm  ferrite  materials
have gained much attention in recent years because of their unique properties and potential
for  many  applications  such  as  magnetic  storage  systems,  magnetic  resonance  imaging,
spintronics  etc.  Cu substitute Co
0.7-x
Ni0.3
Cux
Fe2O4
for  x =  0.05 and 0.1  ferrite materials  are
successfully  synthesized  by  sol-gel  method  processing  at  pH  value  of  7.  The  synthesized
ferrites  are  annealed  at  a  temperature  of  800  °C  for  8  hrs.  The  structure,  chemical
composition, electrical and dielectric properties of both ferrites are characterized by the x-ray
powder diffraction (XRD),  energy dispersive X-ray spectroscopy  (EDX),  Fourier transform
infrared (FT-IR) spectroscopy and complex impedance spectroscopy (CIS).
XRD analysis reveals that both ferrites  show cubic spinel structure with space group Fd3m.
The lattice parameter decreases from 8.447Å to 8.441 Å with increasing Cu content from x =
0.05 to x = 0.1.  The average crystallite sizes of the synthesized samples  are  determined by
using the X-ray analysis broadening of the (311) diffraction peak  by using Debye-Scherrer’s
formula and it is found in the values of 72 and 70.90 nm. The elemental analysis as obtained
from the EDX measurement  indicates the quantitative presence of Co, Ni, Cu, Fe and O in
the synthesized samples. It also confirms the absence of impurities in Co
0.65
Ni0.3
Cu0.05
Fe2O4
and Co
0.6
Ni0.3
Cu0.1
Fe2O4
ferrite samples.  The FT-IR  spectra show  the tetrahedral stretching
vibration  modes  of  Co0.65
Ni0.3
Cu0.05
Fe2O4
and  Co0.6
Ni0.3
Cu0.1
Fe2O4
ferries.  The  two  strong
frequency  bands  appeared  at  wavenumber  569.02  and  572.90  cm
−1
are  responsible  for  the
formation of Co
0.65
Ni0.3
Cu0.05
Fe2O4
and Co
0.6Ni0.3
Cu0.1
Fe2O4
ferrites, respectively.
From the electrical and dielectric properties studies, it is found that the value of the dielectric
constant  as well as the real impendence   of both samples decreases exponentially with an
increasing frequency due to interfacial polarization. For the case of conductivity, the effect of
the  variation  of  frequency  on  the  electrical  conductivity  of  both  synthesized  sample  are
identified.  Their  conduction  mechanism  is  explained  on  the  basis  of  hopping  of  charge
carriers between Fe
2+
- Fe
3+
ions on octahedral sites.
EVALUATING THE IMPLEMENTATION OF THE TEACHING  PHYSICS IN PLASMA LERA AND MUGO SECONDARY AND PREPARATORY SCHOOLS IN  MIRAB AZERENT BEREBERE WEREDA EVALUATING THE IMPLEMENTATION OF THE TEACHING  PHYSICS IN PLASMA-TV: THE CASE OF 11 th  GRADE STUDENTS IN
Creators: name: SHEMSU NESRU HALID
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: The study was conducted to evaluate the implementation of teaching physics though plasmaTV:  the  case  of  Mirab  Azerent  Berebare  Wereda  in  Lera  and  Mugo  Secondary  and
Preparatory Schools in grade 11
th
. To achieve the objectives of the study, research questions
find out  the  problem  of  implementation  of  teaching  physics  in  plasma-TV  by  using  the
response of respondents such as teachers, students, supervisors and school principals. Based
on  this,  the  research  employed  both  qualitatively  and  quantitatively  (mixed  approach),
because the data obtained from interview and open-ended questionnaires needed qualitative
analysis  and  the  data  obtained  through  close-ended  questionnaire  need  quantifying. The
research  helped valid  information  which  was  strengthening  the  power  of  putting  genuine
solutions. The data collected during the study were analyzed using Statistical Package for
Social  Sciences  (SPSS)  version  16.0. Descriptive  statistics  were  used  comprise  frequency
counts, percentages, means, SD. The results of this study indicated that the average interest
(68.35%) to teach  physics  with  plasma-TV, from  teachers  and  students  result the  low
(63.95%) adaptation of activities that done by plasma teacher after the class in both schools,
low availability  of  infrastructure and  man  power  in  both sample schools  according  to  my
observation and respondents result, insufficient integrated work done by classroom teachers
and plasma-TV teacher according  to  teachers’ and students  result, though  the  classroom
observation inefficient  consideration  of  translation  words  by  classroom  teachers.  It  is
recommended  that  classroom  teachers  should  improve  and  create  the  good condition  for
translate of the core idea of the lesson of teaching physics in plasma-TV, give them tutorials,
homework and group work. Therefore, the above mention plasma methods of teaching were
one way of teaching in the curriculum and the area either due to regular continuity or partial
continuity of plasma-TV.
Productivity of Solar Flares and Magnetic Helicity Injection in Active Regions
Creators: name: Park, Sung-Hong
name: Chae, Jongchul
name: Wang, Haimin
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The main objective of this study is to better understand how magnetic helicity injection in an active region is related to the occurrence and intensity of solar flares. We therefore investigate magnetic helicity injection rate and unsigned magnetic flux, as a reference. In total, 378 active regions are analyzed using $SOHO$/MDI magnetograms. The 24-hour averaged helicity injection rate and unsigned magnetic flux are compared with the flare index and the flare-productive probability in next 24 hours following an measurement. In addition, we study the variation of helicity over a span of several days around the times of the 19 flares above M5.0 which occurred in selected strong flare-productive active regions. The major findings of this study are: (1) for a sub-sample of 91 large active regions with unsigned magnetic fluxes in the range from 3 to 5 $\times$ 10$^{22}$ Mx, there is a difference in magnetic helicity injection rate between flaring active regions and non-flaring active regions by a factor of 2; (2) the $GOES$ C-flare-productive probability as a function of helicity injection displays a sharp boundary between flare-productive active regions and flare-quiet ones; (3) the history of helicity injection before all the 19 major flares displayed a common characteristic: a significant helicity accumulation of (3-45)$ \times$ 10 $^{42}$ Mx$^2$ during a phase of monotonically increasing helicity over 0.5 to 2 days. Our results support the notion that helicity injection is important in flares, but it is not effective to use it alone for the purpose of flare forecast. It is necessary to find a way to better characterize the time history of helicity injection as well as its spatial distribution inside active regions.
description: 22 pages, 5 figures, ApJ, in press
Superconducting Stiffness and Coherence Length of FeSe$_{0.5}$Te$_{0.5}$ Measured in Zero-Applied Field
Creators: name: Peri, Amotz
name: Mangel, Itay
name: Keren, Amit
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Superconducting stiffness $ρ_s$ and coherence length $ξ$ are usually determined by measuring the penetration depth $λ$ of a magnetic field and the upper critical field $H_{c2}$ of a superconductor (SC), respectively. However, in magnetic SC, e.g. some of the iron-based, this could lead to erroneous results since the internal field could be very different from the applied one. To overcome this problem in Fe$_{1+y}$Se$_x$Te$_{1-x}$ with $x \sim 0.5$ and $y \sim 0$ (FST), we measure both quantities with the Stiffnessometer technique. In this technique, one applies a rotor-free vector potential $\textbf{A}$ to a superconducting ring and measures the current density $\textbf{j}$ via the ring's magnetic moment $\textbf{m}$. $ρ_s$ and $ξ$ are determined from London's equation $\textbf{j}=-ρ_s\textbf{A}$ and its range of validity. This method is particularly accurate at temperatures close to the critical temperature $T_c$. We find weaker $ρ_s$ and longer $ξ$ than existing literature reports, and critical exponents which agree better with expectations based on the Ginzburg-Landau theory.
description: 10 pages, 10 figures
On the origin of duality in the quantum Hall system
Creators: name: Lütken, C. A.
name: Ross, G. G.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We discuss the possible origin of the duality observed in the quantum Hall current-voltage characteristics. We clarify the difference between "particle-vortex" (complex modular) duality, which acts on the full transport tensor, and "charge-flux" ("real") duality, which acts directly on the filling factor. Comparison with experiment strongly favors the form of duality which descends from the modular symmetry group acting holomorphically on the compexified conductivity.
description: 5 pages, 3 figures
title: ÐÑÐµÐ½ÐºÐ° Ð²Ð»Ð¸ÑÐ½Ð¸Ñ ÑÐ¸ÑÐºÐ¾Ð² Ð½Ð° ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÑÑ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ (Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÐÐÐ "Ð¢Ð°ÑÐ½ÐµÑÑÑ")
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Assessment of the impact of risks on the economic efficiency of an energy enterprise (on the example of PJSC TATNEFT)
Creators: name: Ð ÑÐ±Ð¸Ñ, ÐÑÐ¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð½ÐµÑÑÐµÐ³Ð°Ð·Ð¾Ð²Ð°Ñ Ð¾ÑÑÐ°ÑÐ»Ñ
ÑÐ¸ÑÐº
Ð²Ð¸Ð´Ñ ÑÐ¸ÑÐºÐ¾Ð²
ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ°Ñ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ
ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐºÐ°Ð¼Ð¸
oil and gas industry
risk
types of risk
economic efficiency
risk-management

description: ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð°Ð½Ð°Ð»Ð¸Ð·Ñ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ ÑÐ¸ÑÐºÐ¾Ð² Ð½Ð° ÑÐ°Ð±Ð¾ÑÑ ÑÐ½ÐµÑÐ³ÐµÑÐ¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ, Ð² ÑÐ°ÑÑÐ½Ð¾ÑÑÐ¸ ÐÐÐ Â«Ð¢Ð°ÑÐ½ÐµÑÑÑÂ». ÐÐ°Ð´Ð°ÑÐ¸, ÐºÐ¾ÑÐ¾ÑÑÐµ ÑÐµÑÐ°Ð»Ð¸ÑÑ Ð² ÑÐ¾Ð´Ðµ ÑÐ°Ð±Ð¾ÑÑ: 1. ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐµÐ¾ÑÐµÑÐ¸ÑÐµÑÐºÐ¸Ñ Ð°ÑÐ¿ÐµÐºÑÐ¾Ð² Ð¾ÑÐµÐ½ÐºÐ¸ ÑÐ¸ÑÐºÐ¾Ð² Ð¸ Ð¸Ñ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð½Ð° ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ 2. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¸Ðµ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¸ ÑÐ¸ÑÐºÐ¾Ð² ÐÐÐ Â«Ð¢Ð°ÑÐ½ÐµÑÑÑÂ» 3. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ð¹, Ð½Ð°Ð¿ÑÐ°Ð²Ð»ÐµÐ½Ð½ÑÑ Ð½Ð° ÑÐ½Ð¸Ð¶ÐµÐ½Ð¸Ðµ ÑÐ¸ÑÐºÐ¾Ð² Ð¸ Ð¸Ñ Ð²Ð»Ð¸ÑÐ½Ð¸Ñ Ð½Ð° ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ. Ð Ð°Ð±Ð¾ÑÐ° Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð° Ð½Ð° Ð±Ð°Ð·Ðµ ÐÐÐ­Ð¨. ÐÐ¾ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐ°Ð¼ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° ÑÐ¸Ð½Ð°Ð½ÑÐ¾Ð²Ð¾Ð³Ð¾ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ñ, ÑÐ°ÐºÑÐ¾ÑÐ½Ð¾Ð³Ð¾ Ð°Ð½Ð°Ð»Ð¸Ð·Ð°, Ð¡Ð¢Ð­Ð-Ð°Ð½Ð°Ð»Ð¸Ð·Ð°, SWOT-Ð°Ð½Ð°Ð»Ð¸Ð·Ð°, Ð¿Ð¾ÑÑÑÐ¾ÐµÐ½Ð¸Ñ ÐºÐ°ÑÑÑ ÑÐ¸ÑÐºÐ¾Ð², Ð±ÑÐ»Ð¸ Ð¿ÑÐ¸Ð²ÐµÐ´ÐµÐ½Ñ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ ÑÐ¸ÑÐº-Ð¼ÐµÐ½ÐµÐ´Ð¶Ð¼ÐµÐ½ÑÑ.
description: The given work is devoted to studying analysis of the impact on the operation of an energy enterprise in particular PJSC TATNEFT. The research set the following goals: 1. Research of theoretical risk assessments and its impact on the efficiency of the enterprise 2. Analysis of economic efficiency of activities and risks of PJSC TATNEFT 3. Development of measures aimed at reducing risks and their impact on the efficiency of the enterprise. The work was fulfilled on the premises of GSIE. Based on the results of the analysis of the financial condition, factor analysis, PEST-analysis, SWOT-analysis, building a risk map, there were recommendations given on risk-management.
Evolution of Galaxy Luminosity Function Using Photometric Redshifts
Creators: name: Ramos, B. H. F.
name: Pellegrini, P. S.
name: Benoist, C.
name: da Costa, L. N.
name: Maia, M. A. G.
name: Makler, M.
name: Ogando, R. L. C.
name: de Simoni, F.
name: Mesquita, A. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We examine the impact of using photometric redshifts for studying the evolution of both the global galaxy luminosity function (LF) and that for different galaxy types. To this end we compare LFs obtained using photometric redshifts from the CFHT Legacy Survey (CFHTLS) D1 field with those from the spectroscopic survey VIMOS VLT Deep Survey (VVDS) comprising ~4800 galaxies. We find that for z<2, in the interval of magnitudes considered by this survey, the LFs obtained using photometric and spectroscopic redshifts show a remarkable agreement. This good agreement led us to use all four Deep fields of CFHTLS comprising ~386000 galaxies to compute the LF of the combined fields and estimate directly the error in the parameters based on field-to-field variation. We find that the characteristic absolute magnitude M* of Schechter fits fades by ~0.7mag from z~1.8 to z~0.3, while the characteristic density phi* increases by a factor of ~4 in the same redshift bin. We use the galaxy classification provided by the template fitting program used to compute photometric redshifts and split the sample into galaxy types. We find that these Schechter parameters evolve differently for each galaxy type, an indication that their evolution is a combination of several effects: galaxy merging, star formation quenching and mass assembly. All these results are compatible with those obtained by different spectroscopic surveys such as VVDS, DEEP2 and zCosmos, which reinforces the fact that photometric redshifts can be used to study galaxy evolution, at least for the redshift bins adopted so far. This is of great interest since future very large imaging surveys containing hundreds of millions of galaxies will allow to obtain important precise measurements to constrain the evolution of the LF and to explore the dependence of this evolution on morphology and/or color helping constrain the mechanisms of galaxy evolution.
description: 29 pages, 10 figures. Approved for publication in The Astronomical Journal
Tensor meson couplings in AdS/QCD
Creators: name: Mamedov, Shahin
name: Hashimli, Zeynab
name: Jafarzade, Shahriyar
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the hadronic and radiative couplings of the $f_2(1270)$ meson within the hard- and soft-wall models of AdS/QCD. The results for the tensor meson-nucleon-nucleon coupling ($g_{f_2NN}$) and tensor meson-photon-vector meson coupling ($g_{f_2γρ}$) are compared to the ones obtained by using the dispersion relations and amplitude methods, respectively. Qualitative agreement with different analyses implies the reliability of the holographic description of spin-2 meson.
description: 14 pages, 2 figures
A novel approach to understanding cognitive fatigue and sleep deprivation in Canadian wildland firefighters
Creators: name: Jeklin, Andrew
Publisher: name: University of British Columbia
Year: 2019

description: Wildland firefighters are subject to prolonged and irregular shifts which can have detrimental effects on sleep and increase fatigue. Fatigue and sleep deprivation can reduce information-processing resulting in slower reaction times, poor decision-making, situational awareness, and hazard recognition. At present, current research on fatigue and sleep in firefighters is lacking and limited to laboratory studies. The main goal of this study was to provide insight and understanding into the impact the current wildland firefighting schedule has on the emergence of cognitive fatigue in an effort to guide future interventions that aim to improve occupational health and safety amongst wildland firefighters. This study aimed to objectively and subjectively measure sleep quantity, quality and fatigue throughout a 17-day firefighting deployment amongst firefighters in British Columbia, Canada during the fire season. During the deployment, 39 firefighters’ sleep was assessed using wrist actigraphy and subjective questionnaires. Fatigue was assessed using a cognitive performance test known as the psychomotor vigilance test. Our analysis revealed that sleep quantity was suboptimal during both fire and non-fire days. Total sleep time and sleep efficiency was less on fire days compared to non-fire days. Firefighters reported being significantly sleepier towards the end of their 14-day deployment. Our results also demonstrated that firefighters continued to report high levels of sleepiness and poor quality of sleep throughout their rest days immediately following their work deployment. Firefighters performed significantly poorer on cognitive performance tests and reported significantly higher levels of fatigue and decreased alertness near the end of their 14-day work deployment. Our results provide valuable insight into the development of fatigue across a 14-day work schedule and into the 3-day rest period for wildland firefighters. Our study highlights that firefighters may still be fatigued, sleep deprived and inadequately rested prior to their work deployment. Fire agencies and researchers should target future interventions and studies that aim to improve and manage sleep and fatigue during firefighters’ work and rest days.
Further solutions of fractional reaction-diffusion equations in terms of the H-function
Creators: name: Haubold, H. J.
name: Mathai, A. M.
name: Saxena, R. K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: This paper is a continuation of our earlier paper in which we have derived the solution of an unified fractional reaction-diffusion equation associated with the Caputo derivative as the time-derivative and the Riesz-Feller fractional derivative as the space-derivative. In this paper, we consider an unified reaction-diffusion equation with Riemann-Liouville fractional derivative as the time-derivative and Riesz-Feller derivative as the space-derivative. The solution is derived by the application of the Laplace and Fourier transforms in a compact and closed form in terms of the H-function. The results derived are of general character and include the results investigated earlier by Kilbas et al. (2006a), Saxena et al. (2006c), and Mathai et al. (2010). The main result is given in the form of a theorem. A number of interesting special cases of the theorem are also given as corollaries.
description: 11 pages, LaTeX
Affine Pieri rule for periodic Macdonald spherical functions and fusion rings
Creators: name: van Diejen, Jan Felipe
name: Emsiz, Erdal
name: Zurrián, Ignacio N.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Representation Theory (math.RT)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05E05, 17B67, 33D52, 33D80, 81T40

description: Let $\hat{\mathfrak{g}}$ be an untwisted affine Lie algebra or the twisted counterpart thereof (which excludes the affine Lie algebras of type $\widehat{BC}_n=A^{(2)}_{2n}$). We present an affine Pieri rule for a basis of periodic Macdonald spherical functions associated with $\hat{\mathfrak{g}}$. In type $\hat{A}_{n-1}=A^{(1)}_{n-1}$ the formula in question reproduces an affine Pieri rule for cylindric Hall-Littlewood polynomials due to Korff, which at $t=0$ specializes in turn to a well-known Pieri formula in the fusion ring of genus zero $\widehat{\mathfrak{sl}}(n)_c$-Wess-Zumino-Witten conformal field theories.
description: 25 pages
title: Ð¢ÑÐ¸Ð±Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¸Ð¹ Ð¼Ð¾Ð´ÑÐ»Ñ Ð´Ð»Ñ Ð²ÑÐµÐ¼ÑÐ¿ÑÐ¾Ð»ÐµÑÐ½Ð¾Ð³Ð¾ Ð¼Ð°ÑÑ-ÑÐ¿ÐµÐºÑÑÐ¾Ð¼ÐµÑÑÐ°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Tribological module for time-of-flight mass-spectrometer
Creators: name: Ð§ÐµÑÐ½ÑÑÐ¾Ð², ÐÐ°ÐºÑÐ¸Ð¼
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐÐ°ÑÑ-ÑÐ¿ÐµÐºÑÑÐ¾Ð¼ÐµÑÑÐ¸Ñ
ÑÑÐ¸Ð±Ð¾Ð¼ÐµÑÑ
ÑÑÐµÐ½Ð¸Ðµ
Ð¿Ð¾Ð»Ð¸Ð¼ÐµÑÑ
Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐ° Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¸Ñ Ð¸Ð·Ð¼ÐµÑÐµÐ½Ð¸Ð¹

description: Ð Ð°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐµ ÑÑÐ¸Ð±Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ Ð´Ð»Ñ Ð²ÑÐµÐ¼ÑÐ¿ÑÐ¾Ð»ÐµÑÐ½Ð¾Ð³Ð¾ Ð¼Ð°ÑÑ-ÑÐ¿ÐµÐºÑÑÐ¾Ð¼ÐµÑÑÐ° Ð¸ Ð¼ÐµÑÐ¾Ð´Ð¸ÐºÐµ ÐµÐ³Ð¾ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ Ð´Ð»Ñ Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð¸Ñ Ð½Ð°ÑÑÐ½Ð¾-Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°ÑÐµÐ»ÑÑÐºÐ¸Ñ ÑÐ°Ð±Ð¾Ñ. ÐÑÐ»Ð° ÑÐ´ÐµÐ»Ð°Ð½ Ð¿ÑÐ¸Ð±Ð¾Ñ AV1 Ñ Ð³ÐµÐ¾Ð¼ÐµÑÑÐ¸ÐµÐ¹ ÐºÐ¾Ð½ÑÐ°ÐºÑÐ° Ð¿Ð¾Ð»ÑÐ¹ ÑÐ¸Ð»Ð¸Ð½Ð´Ñ-Ð¿Ð¾-Ð¿Ð»Ð¾ÑÐºÐ¾ÑÑÐ¸ Ð´Ð»Ñ Ð¸ÑÐ¿ÑÑÐ°Ð½Ð¸Ð¹ Ð² Ð°ÑÐ¼Ð¾ÑÑÐµÑÐ½ÑÑ ÑÑÐ»Ð¾Ð²Ð¸ÑÑ Ð¸ Ð´Ð¾ÐºÐ°Ð·Ð°Ð½Ð° ÐµÐµ Ð¿ÑÐ¸Ð¼ÐµÐ½Ð¸Ð¼Ð¾ÑÑÑ Ð½Ð° Ð¿ÑÐ°ÐºÑÐ¸ÐºÐµ. ÐÐ°ÑÐµÐ¼ Ð±ÑÐ» Ð¸Ð·Ð³Ð¾ÑÐ¾Ð²Ð»ÐµÐ½ ÑÑÐ¸Ð±Ð¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¸Ð¹ Ð¼Ð¾Ð´ÑÐ»Ñ VV1 Ñ ÑÐ°ÐºÐ¾Ð¹ Ð¶Ðµ Ð³ÐµÐ¾Ð¼ÐµÑÑÐ¸ÐµÐ¹ ÐºÐ¾Ð½ÑÐ°ÐºÑÐ° Ð¸ ÑÐ¸ÑÑÐµÐ¼Ð¾Ð¹ ÑÐµÐ³Ð¸ÑÑÑÐ°ÑÐ¸Ð¸ ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½ÑÐ° ÑÑÐµÐ½Ð¸ÑÐ¸. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½Ñ Ð¸ÑÐ¿ÑÑÐ°Ð½Ð¸Ñ ÑÑÐµÐ½Ð¸Ñ Ð² ÑÑÐ»Ð¾Ð²Ð¸ÑÑ Ð²Ð°ÐºÑÑÐ¼Ð°. Ð£ÑÑÐ°Ð½Ð¾Ð²Ð»ÐµÐ½Ð¾ ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²Ð¸Ðµ Ð¸Ð·Ð¼ÐµÑÐµÐ½Ð¸Ñ ÐºÐ¾ÑÑÑÐ¸ÑÐ¸ÐµÐ½ÑÐ° ÑÑÐµÐ½Ð¸Ñ Ñ Ð´Ð°Ð½Ð½ÑÐ¼Ð¸, Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÐ¼Ð¸ Ð½Ð° Ð¿ÑÐ¸Ð±Ð¾ÑÐµ AV1, Ð° ÑÐ°ÐºÐ¶Ðµ Ð¾ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸Ð·Ð¾Ð²Ð°Ð½Ñ Ð¿ÑÐ¾ÑÐµÑÑÑ, Ð¿ÑÐ¾ÑÐµÐºÐ°ÑÑÐ¸Ðµ Ð¿ÑÐ¸ ÑÑÐµÐ½Ð¸Ð¸ Ð¿Ð¾Ð»Ð¸Ð¼ÐµÑÐ¾Ð² Ð² Ð²Ð°ÐºÑÑÐ¼Ðµ.
description: This work is devoted to the development of a tribological module for a time-of-flight mass spectrometer and the method of its use for research work. The AV1 device was made with a hollow cylinder-on-plane contact geometry for testing in atmospheric conditions and its applicability in practice was proved. Then the tribological module VV1 was manufactured with the same contact geometry and a system for registering the coefficient of friction. Fric-tion tests were carried out under vacuum conditions. The measurement of the coefficient of friction corresponds to the data obtained on the AV1 device, and the processes occurring during the friction of polymers in vacuum are charac-terized.
STUDIES ON STRUCTURAL, ELECTRIC, DIELECTRIC  AND MAGNETIC PROPERTIES OF NICKEL-BASED  FERRITE MATERIALS
Creators: name: SELAMU SHAMEBO
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: NiCr0.07
Fe1.93O4
and NiCo0.07
Fe1.93O4
ferrite materials were successfully synthesized by sol-gel
method  at the temperature of 750
o
C for 6 hours in air.  The structural, the electrical, dielectric
and magnetic properties of both materials are investigated by x-ray  powder diffraction (XRD),
scanning  electron  microscopy  (SEM),  Fourier  transform  infrared  (FT-IR)  spectroscopy,
impedance spectroscopy (IS) and  electron  spin  resonance (ESR)  spectroscopy techniques.  The
X-ray diffraction patterns  of the synthesized  samples confirm  the formation of spinel structure
with Fd3m space group without any secondary phases or impurities. The  crystallite sizes  are
calculated from most intense peak using the Scherrer formula.  It is found that  NiCr0.07
Fe1.93O4
has  larger  crystal  size  (48.5nm)  than  NiCo0.07
Fe1.93O4  (46.3nm).  The  calculated  lattice
parameters  are  found  to  be  8.387Å  and  8.377Å  for  NiCr0.07
Fe1.93O4
and  NiCo0.07
Fe1.93O4
,
respectively.  SEM  micrographs  of  both  powder  samples  are  almost  dense  and  have  fewer
pores.  FT-IR measurements show two fundamental  absorption bands, assigned to the vibration
of tetrahedral (A-sites) and octahedral (B-sites).  The frequency dependent of the real (Z′) and
imaginary (Z′′) parts of the impedance for both samples  measured at room temperature in the
frequency range from 1Hz  to 1MHz  was  investigated in this study.  It  was  observed that the Z′
and Z′′ values are typically higher at low frequency regions. The high value of Z′ and Z′′ at this
frequency region is due to the high polarization caused by space charge. Further, t he frequency
dependence of the  electrical and dielectric properties  of  NiCr0.07
Fe1.93O4  and  NiCo0.07
Fe1.93O4
ferrites are  studied in the frequency range of 1 Hz to 1MHz.    Experimental results show that
the  dielectric  constant  ε′  is  found  to  decrease  with  increasing  frequency.    However,  the  ac
electrical conductivity       increases with increasing frequency.    From magnetic study;  it  was
found that both ferrites exhibit broad and symmetrical signals which are due to the presence of
unpaired electrons in the compounds.
การศึกษาประสิทธิภาพของการจัดเก็บตัวอย่างเซลล์เยื่อบุกระพุ้งแก้มด้วยก้านสําลีสําหรับการเพิ่มปริมาณพีซีอาร์โดยตรงเพื่อการพิสูจน์เอกลักษณ์บุคคลโดยใช้ลายพิมพ์ดีเอ็นเอ
Creators: name: วิทยา วงษ์ตรี
Publisher: name: กองบริหารการวิจัย
Year: 2565
Subjects: เซลล์เยื่อบุกระพุ้งแก้ม
พีซีอาร์โดยตรง
การทดสอบเอกลักษณ์บุคคล

description: วารสารวิทยาศาสตร์และเทคโนโลยี, 30, 1, 97-108
An Exploration of Conditioning Methods in Graph Neural Networks
Creators: name: Koishekenov, Yeskendir
name: Bekkers, Erik J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: The flexibility and effectiveness of message passing based graph neural networks (GNNs) induced considerable advances in deep learning on graph-structured data. In such approaches, GNNs recursively update node representations based on their neighbors and they gain expressivity through the use of node and edge attribute vectors. E.g., in computational tasks such as physics and chemistry usage of edge attributes such as relative position or distance proved to be essential. In this work, we address not what kind of attributes to use, but how to condition on this information to improve model performance. We consider three types of conditioning; weak, strong, and pure, which respectively relate to concatenation-based conditioning, gating, and transformations that are causally dependent on the attributes. This categorization provides a unifying viewpoint on different classes of GNNs, from separable convolutions to various forms of message passing networks. We provide an empirical study on the effect of conditioning methods in several tasks in computational chemistry.
A limit of nonplanar 5-body central configurations is nonplanar
Creators: name: Albouy, Alain
name: Fernandes, Antonio Carlos
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70F10

description: Moeckel (1990), Moeckel and Simó (1995) proved that, while continuously changing the masses, a 946-body planar central configuration bifurcates into a spatial central configuration. We show that this kind of bifurcation does not occur with 5 bodies. Question 17 in the list Albouy & al (2012) is thus answered negatively.
description: 17 pages, 5 figures, 2 footnotes
REVIEW OF FRICTION, WEAR AND MECHANICAL PROPERTIES OF  ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE USED IN TOTAL  JOINT REPLACEMENT
Creators: name: BABISA BAZULA
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: This project work is areview of  the  experimental techniques that can be applied  to
ultrahigh molecular weight polyethylene (UHMWPE), which is commonly used in total
joint replacement (TJR).The limitations  of these techniques  caused by the inherent
properties of the material or the instruments for characterization are discussed.The
friction, wear and  mechanical properties  of UHMWPE as a  function of polymer
crystallinity in both micro and nano scale are reviewed.
THE IMPACT OF CONTINUOUS ASSESSMENT ON STUDENTS ACADEMIC ACHIEVEMENT  IN  PHYSICS: IN SELAMBER  SECONDARY  AND PREPARATORY SCHOOLIN KUCHA WOREDA:  GAMO GOFA  ZONE:   SNNPR:  ETHIOPIA
Creators: name: AKLILU ABERA DESTA
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: The Purpose of this study was to  assess  the  impact  of Continuous  Assessment on  academic
achievement of students in physics in Selamber Secondary and Preparatory School   particularly
in grade 10 ,  Kucha Wereda, Gamo   Gofa  Zone, SNNPR,  Ethiopia.  To achieve this  objective,
descriptive survey and correlational analysis design was  employed. To   investigate this problem
the guiding research questions were  employed based on the objective of the study such as
examining the impact of continuous assessment, identifying   the main   factors that affects the
imple mentation of con tinuous assessment and to  explore  how continuous assessment strategies
are  useful  to   im plementing the practice.  To do  this investigation sample s  were nominated by
using purposive  and  simple  random sampling  methods.  From  seven secondary schools in Kucha
Wereda,  Selamber  Secondary and Preparatory  School   was  selected purposively   and  90  key
informant interviewees  out  of 900 total populations  were  selected by  simple random sampling
method. To k eep the propo rtional allocation of students from each  section,  systematic  sampling
technique  was used. In this study, both primary and secondary data  were used. Data which were
collected from both primary and secondary sources were analyzed, summarized and presented by
means of quantitative and qualitative method of data analysis by using simple descriptive
statistics (frequency, percentage, mean, sta ndard deviation and chi-square) of SPSS and
narrative discussion.  To make the findings easily understandable for the  readers‟  tables, figures
and charts were necessarily used.  The finding of the study revealed that majority teachers did not
include variety of continuous assessment techniques in their plan and  in the classroom activities.
Thus, the imple mentation practice of  continuous assessment was insufficient.  The study indicated
that  limited   inputs and facilities for teachers and students, lack of interest for students towards
the subject, teachers‟ inadequate k nowledge of the way and techniques of continuous assessment
practice, lack of interest and commitment on teachers and students concerning continuous
assessment, poor administrative support, large class size   challenge to implement continuo us
assessments, absence   of continuous assessment guide line were the major facto rs that hindered
the implementation of continuous assessment in the  school. In  general, there was awareness and
administration gap among teachers how to use variety of continuous assessment tools in their
class room activities. They only concentrated on  few tools such as oral questions, class work,
homework and tests. Therefore,  all the stak eholders have to collaboratively involve in enha ncing
continuous assessment practices in the school.
DENSITY FUNCTIONAL THEORY STUDY OF STRUCTURAL,  ELASTIC, ELECTRONIC AND OPTICAL PROPERTIES OF Bi(Ga, In)O3 CUBIC PEROVSKITE MATERIALS
Creators: name: TILAHUN MULUGETA
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: In this study, structure, elastic, electronic and optical properties of cubic perovskite BiGaO3
and BiInO3 are calculated using the full-potential linearized augmented plane wave method
in the density functional theory (DFT) using WIEN2k software.  The calculated crystal
structure of BiGaO3 and BiInO3 reveals that both compounds possess cubic crystal structure
with pm-3m space group. The calculation of the structural parameters of both compounds
confirms that the LDA gives a better value of the lattice parameters as compared to the GGA-WC and GGA-PBE.
The calculated band gap for BiGaO3  and BiInO3  with GGA-mBJ  reveal that these
compounds exhibit semiconducting behavior with an indirect band gap between the occupied
O 2p and unoccupied Bi 6p orbitals. From the density of states (DOS) calculation of both
compounds, four regions due to the contribution Ga 3d orbital states, Bi/In 6s orbital and O
2p orbital states are clearly identified. It is also found that there exists a strong ionic bonding
between Bi and O and a mixture of ionic and covalent bonding between Ga and O as well as
In and O. The calculated elastic constants for BiGaO3 and BiInO3 with GGA-WC method
indicates that both compounds are mechanically stable at ambient condition. To investigate
the optical properties ofBiGaO3 and BiInO3compounds, the real and imaginary parts of the
dielectric functions, refractive index, reflectivity spectra, extinction coefficient , optical
absorption coefficient and electron energy loss function and real part of optical and optical
conductivity are calculated with mBJ-GGA method in the photon energy range of 0 to 30 eV.
A similar effect is observed in both BiInO3 and BiGaO3compounds.
Broadband time-reversal of optical pulses using a switchable photonic-crystal mirror
Creators: name: Sivan, Yonatan
name: Pendry, John B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Recently, Chumak et al. have demonstrated experimentally the time-reversal of microwave spin pulses based on non-adiabatically tuning the wave speed in a spatially-periodic manner. Here, we solve the associated wave equations analytically, and give an explicit formula for the reversal efficiency. We then discuss the implementation for short optical electromagnetic pulses and show that the new scheme may lead to their accurate time-reversal with efficiency higher than before.
title: ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÐµÑÐµÐ½Ð¸Ñ Ð²ÑÐ·ÐºÐ¾Ð¹ Ð¶Ð¸Ð´ÐºÐ¾ÑÑÐ¸ Ð² ÑÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ðµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Modeling the flow of a viscous liquid in a pipeline
Creators: name: ÐÐ»ÐµÑÐºÐ¾, ÐÐ°ÐºÑÐ¸Ð¼
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2023
Subjects: ÑÐµÑÐµÐ½Ð¸Ðµ Ð¶Ð¸Ð´ÐºÐ¾ÑÑÐ¸ Ð² ÑÑÑÐ±Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð´Ðµ
ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ðµ ÐÐ¾Ð»ÑÑÐ¼Ð°Ð½Ð°
ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ðµ ÐÐ°Ð²ÑÐµ-Ð¡ÑÐ¾ÐºÑÐ°
Ð»Ð°Ð¼Ð¸Ð½Ð°ÑÐ½Ð¾Ðµ ÑÐµÑÐµÐ½Ð¸Ðµ
Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð² ÑÑÐµÐ´Ðµ MATLAB
fluid flow in a pipeline
Boltzmann equation
Navier-stokes equation
laminar flow
modeling in MATLAB

description: ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð¼Ð¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÐµÑÐµÐ½Ð¸Ñ Ð²ÑÐ·ÐºÐ¾Ð¹ Ð¶Ð¸Ð´ÐºÐ¾ÑÑÐ¸ Ð½Ð° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð¼ÐµÑÐ¾Ð´Ð° ÑÐµÑÐµÑÐ¾ÑÐ½ÑÑ ÑÑÐ°Ð²Ð½ÐµÐ½Ð¸Ð¹ ÐÐ¾Ð»ÑÑÐ¼Ð°Ð½Ð°. ÐÐ°Ð´Ð°ÑÐ¸, ÐºÐ¾ÑÐ¾ÑÑÐµ ÑÐµÑÐ°Ð»Ð¸ÑÑ Ð² ÑÐ¾Ð´Ðµ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ: 1. ÐÐ·ÑÑÐµÐ½Ð¸Ðµ Ð¾ÑÐ½Ð¾Ð²Ð½ÑÑ Ð¿Ð°ÑÐ°Ð¼ÐµÑÑÐ¾Ð² Ð¶Ð¸Ð´ÐºÐ¸Ñ ÑÑÐµÐ´. 2. ÐÐ¾ÑÑÐ°Ð½Ð¾Ð²ÐºÐ° Ð·Ð°Ð´Ð°ÑÐ¸ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·ÑÑ ÑÐ¸ÑÐ»ÐµÐ½Ð½ÑÐ¹ Ð¼ÐµÑÐ¾Ð´ ÑÐµÑÐµÑÐ¾Ðº ÐÐ¾Ð»ÑÑÐ¼Ð°Ð½Ð°. 3. ÐÐ¾Ð´ÐµÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð² ÑÑÐµÐ´Ðµ MATLAB. ÐÐ¾Ð»ÑÑÐµÐ½Ð¾ ÑÐ¸ÑÐ»ÐµÐ½Ð½Ð¾Ðµ ÑÐµÑÐµÐ½Ð¸Ðµ ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²ÑÑÑÐµÐ¹ Ð·Ð°Ð´Ð°ÑÐ¸ Ð² Ð½ÐµÐºÐ¾ÑÐ¾ÑÑÑ ÑÐ°ÑÑÐ½ÑÑ ÑÐ»ÑÑÐ°ÑÑ. Ð Ð°Ð±Ð¾ÑÐ° Ð¼Ð¾Ð¶ÐµÑ Ð±ÑÑÑ Ð¾ÑÐ½Ð¾Ð²Ð¾Ð¹ Ð´Ð»Ñ ÑÐµÑÐµÐ½Ð¸Ñ ÑÐµÐ°Ð»ÑÐ½ÑÑ Ð·Ð°Ð´Ð°Ñ Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð²ÑÐ·ÐºÐ¾Ð¹ Ð¶Ð¸Ð´ÐºÐ¾ÑÑÐ¸ Ñ ÑÐ°Ð·Ð»Ð¸ÑÐ½ÑÐ¼Ð¸ Ð³ÑÐ°Ð½Ð¸ÑÐ½ÑÐ¼Ð¸ ÑÑÐ»Ð¾Ð²Ð¸ÑÐ¼Ð¸.
description: This work is devoted to the study of modeling the flow of a viscous fluid based on the method of lattice Boltzmann equations. Tasks that were solved during the study: 1. Study of the main parameters of liquid media. 2. Formulation of the problem using the numerical method of Boltzmann lattices. 3. Modeling in the MATLAB environment. A numerical solution of the corresponding problem is obtained in some special cases. The work can be the basis for solving real problems of viscous fluid motion with different boundary conditions.