bluuebunny/crossref_metadata_2025 huggingface dataset:
Seasonal and local time variations of sporadic E layer over South Korea
Authors: Jo Eunbyeol , Kim Yong Ha , Moon Suin , Kwak Young-Sil
Published: May 2023

We have investigated the variations of sporadic E (Es) layer using the
measurements of digisondes at Icheon (37.14°N, 127.54°E, IC) and Jeju (33.4°N, 126.30°E,
JJ) in 2011–2018. The Es occurrence rate and its critical frequency (foEs) have peak
values in summer at both IC and JJ in consistent with their known seasonal variations at
mid-latitudes. The virtual height of the Es layer (h’Es) during equinox months is
greater than that in other months. It may be related to the similar variation of meteor
peak heights. The h’Es shows the semidiurnal variations with two peaks at early in the
morning and late in the afternoon during equinoxes and summer. However, the semi-diurnal
variation is not obvious in winter. The semi-diurnal variation is generally thought to
be caused by the semi-diurnal tidal variation in the neutral wind shear, whose
measurements, however, are rare and not available in the region of interest. To
investigate the formation mechanism of Es, we have derived the vertical ion drift
velocity using the Horizontal Wind Model (HWM) 14, International Geomagnetic Reference
Field, and Naval Research Laboratory Mass Spectrometer and Incoherent Scatter Radar-00
models. Our results show that h’Es preferentially occur at the altitudes where the
direction of the vertical ion velocity changes. This result indicates the significant
role of ion convergence in the creation of Es.
Analysis of Magnetic Dipole Moment for a 300-W Solar-Cell Array
Authors: Shin Goo-Hwan , Kim Dong-Guk , Kwon Se-Jin , Lee Hu-Seung
Published: May 2023

The attitude information of spacecraft can be obtained by the sensors attached to
it using a star tracker, three-axis magnetometer, three-axis gyroscope, and a global
positioning signal receiver. By using these sensors, the spacecraft can be maneuvered by
actuators that generate torques. In particular, electromagnetic-torque bars can be used
for attitude control and as a momentum-canceling instrument. The spacecraft momentum can
be created by the current through the electrical circuits and coils. Thus, the current
around the electromagnetic-torque bars is a critical factor for precisely controlling
the spacecraft. In connection with these concerns, a solar-cell array can be considered
to prevent generation of a magnetic dipole moment because the solar-cell array can
introduce a large amount of current through the electrical wires. The maximum value of a
magnetic dipole moment that cannot affect precise control is 0.25 A·m2, which takes into
account the current that flows through the reaction-wheel assembly and the
magnetic-torque current. In this study, we designed a 300-W solar cell array and
presented an optimal wire-routing method to minimize the magnetic dipole moment for
space applications. We verified our proposed method by simulation.
Analysis of Papers Published in the Journal of Astronomy and Space Sciences from
1984 to 2018
Authors: Jeon Junhyeok , Kim Yonggi
Published: May 2023

This paper presents at the characteristics of publications in the Journal of
Astronomy and Space Sciences from 1984 to 2018. Since its first publication, a total of
1,113 papers (~35 volumes) have been published up to December 2018. While the space
astronomy field has made up a large portion of the total number of papers, the number of
annually published papers in this field is decreasing. In contrast, the number of papers
in the space environment field has been showing an increasing trend since 2013,
accounting for more than 30% of the annual publications. The participation rate of
foreign researchers has been maintained at greater than 20% since 2012. Despite the
decrease in the number of paper per year, there are positive developments including
sustained foreign researcher participation at greater than 20% and improvements in the
impact factor. We believe that JASS has the potential to enter the distinguished level
of international academic journals following a welldeveloped future road map.
Frozen Orbits Construction for a Lunar Solar Sail
Authors: Khattab Elamira Hend , Radwan Mohamed , Rahoma Walid Ali
Published: May 2023

Frozen orbit is an attractive option for orbital design owing to its
characteristics (its argument of pericenter and eccentricity are kept constant on an
average). Solar sails are attractive solutions for massive and expensive missions.
However, the solar radiation pressure effect represents an additional force on the solar
sail that may greatly affect its orbital behavior in the long run. Thus, this force must
be included as a perturbation force in the dynamical model for more accuracy. This study
shows the calculations of initial conditions for a lunar solar sail frozen orbit. The
disturbing function of the problem was developed to include the lunar gravitational
field that is characterized by uneven mass distribution, third body perturbation, and
the effect of solar radiation. An averaging technique was used to reduce the dynamical
problem to a long period system. Lagrange planetary equations were utilized to formulate
the rate of change of the argument of pericenter and eccentricity. Using the reduced
system, frozen orbits for the Moon sail orbiter were constructed. The resulting frozen
orbits are shown by two 3Dsurface (semimajor, eccentricity, inclination) figures. To
simplify the analysis, we showed inclination–eccentricity contours for different values
of semi-major axis, argument of pericenter, and values of sail lightness number.
Development of Forecast Algorithm for Coronal Mass Ejection Speed and Arrival Time
Based on Propagation Tracking by Interplanetary Scintillation g-Value
Authors: Park Sa-Rah , Jeon Ho-Cheol , Kim Rok-soon , Kim Jong-Hyeon , Kim Seung-Jin , Cho Junghee , Jang Soojeong
Published: May 2023

We have developed an algorithm for tracking coronal mass ejection (CME)
propagation that allows us to estimate CME speed and its arrival time at Earth. The
algorithm may be used either to forecast the CME’s arrival on the day of the forecast or
to update the CME tracking information for the next day’s forecast. In our case study,
we successfully tracked CME propagation using the algorithm based on g-values of
interplanetary scintillation (IPS) observation provided by the Institute for Space-
Earth Environmental Research (ISEE). We were able to forecast the arrival time (Δt =
0.30 h) and speed (Δv = 20 km/s) of a CME event on October 2, 2000. From the
CME-interplanetary CME (ICME) pairs provided by Cane & Richardson (2003), we
selected 50 events to evaluate the algorithm’s forecast capability. Average errors for
arrival time and speed were 11.14 h and 310 km/s, respectively. Results demonstrated
that g-values obtained continuously from any single station observation were able to be
used as a proxy for CME speed. Therefore, our algorithm may give stable daily forecasts
of CME position and speed during propagation in the region of 0.2–1 AU using the IPS
g-values, even if IPS velocity observations are insufficient. We expect that this
algorithm may be widely accepted for use in space weather forecasting in the near
future.
Determination of Orbital Elements and Ephemerides using the Geocentric Laplace’s
Method
Authors: Espitia Daniela , Quintero Edwin A. , Arellano-Ramírez Ivan D.
Published: May 2023

This paper presents a methodology for Initial Orbit Determination (IOD) based on
a modification of the Laplace’s geocentric method. The orbital elements for Near-Earth
asteroids (1864) Daedalus, 2003 GW, 2019 JA8, a Hungaria-type asteroid (4690)
Strasbourg, and the asteroids of the Main Belt (1738) Oosterhoff, (2717) Tellervo,
(1568) Aisleen and (2235) Vittore were calculated. Input data observations from the
Minor Planet Center MPC database and Astronomical Observatory of the Technological
University of Pereira (OAUTP; MPC code W63) were used. These observations cover
observation arcs of less than 22 days. The orbital errors, in terms of shape and
orientation for the estimated orbits of the asteroids, were calculated. The shape error
was less than 53 × 10–3 AU, except for the asteroid 2019 JA8. On the other hand, errors
in orientation were less than 0.1 rad, except for (4690) Strasbourg. Additionally, we
estimated ephemerides for all bodies for up to two months. When compared with actual
ephemerides, the errors found allowed us to conclude that these bodies can be recovered
in a field of vision of 95’ × 72’ (OAUTP field). This shows that Laplace’s method,
though simple, may still be useful in the IOD study, especially for observatories that
initiate programs of minor bodies observation.
Validation of KREAM Based on In-Situ Measurements of Aviation Radiation in
Commercial Flights
Authors: Hwang Junga , Kwak Jaeyoung , Jo Gyeongbok , Nam Uk-won
Published: May 2023

There has been increasing necessity of more precise prediction and measurements
of aviation radiation in Korea. For our air crew and passengers’ radiation safety, we
develop our own radiation prediction model of KREAM. In this paper, we validate the
KREAM model based on comparison with Liulin observations. During early three months of
this year, we perform total 25 experiments to measure aviation radiation exposure using
Liulin-6K in commercial flights. We found that KREAM’s result is very well consistent
with Liulin observation in general. NAIRAS shows mostly higher results than Liulin
observation, while CARI-6M shows generally lower results than the observations. The
percent error of KREAM compared with Liulin observation is 10.95%. In contrast, the
error for NAIRAS is 43.38% and 22.03% for CARI-6M. We found that the increase of the
altitude might cause sudden increase in radiation exposure, especially for the polar
route. As more comprehensive and complete analysis is required to validate KREAM’s
reliability to use for the public service, we plan to expand these radiation
measurements with Liulin and Tissue Equivalent Proportional Counter (TEPC) in the near
future.
Methodology for the Observations of Stellar Occultations by Small Bodies of the
Solar System
Authors: Salazar-Manzano Luis E. , Quintero Edwin A.
Published: May 2023

The observation of stellar occultations constitutes one of the most important
techniques for determining the dimensions and establishing the physical parameters of
small Solar System bodies. The most substantial calculations are obtained from multiple
observations of the same event, which turns the observation of stellar occultations into
highly collaborative work and groups teams of observers through international networks.
The above situation also requires the participation of both professional and amateur
observers in these collaborative networks. With the aim of promoting the participation
of professional and amateur groups in the collaborative observation of stellar
occultations, we present the methodology developed by the Astronomical Observatory of
the Technological University of Pereira (OAUTP) for the observations of occultations due
small Solar System bodies. We expose the three fundamental phases of the process: the
plan to make observations, the capture of the events, and the treatment of the data. We
apply our methodology using a fixed station and a mobile station to observe stellar
occultations due to MBAs (354) Eleonora (61) Danae (15112) Arlenewolfe (3915) Fukushima
(61788) 2000 QP181 (425) Cornelia (257) Silesia (386) Siegena and (41) Daphne, and due
to TNOs 1998BU48 and (529823) 2010 PP81. The positive detections for the objects (257)
Silesia (386) Siegena and (41) Daphne allow us to derive lower limits in the diameter of
the MBAs of 63.1 km, 166.2 km and 158.7 km and offsets in the astrometric position (Δαc
cosδc, Δδc) of 622.30 ± 0.83, 15.23 ± 9.88 mas, 586.06 ± 1.68, 43.03 ± 13.88 mas and
–413.44 ± 9.42, 234.05 ± 19.12 mas, respectively.
A Substorm Injection Event and the Radiation Belt Structure Observed by Space
Radiation Detectors onboard Next Generation Small Satellite-1 (NEXTSat-1)
Authors: Yoo Ji-Hyeon , Lee Dae-Young , Kim Eojin , Seo Hoonkyu , Ryu Kwangsun , Kim Kyung-Chan , Min Kyoungwook , Sohn Jongdae , Lee Junchan , Seon Jongho , Kang Kyung-In , Lee Seunguk , Park Jaeheung , Shin Goo-Hwan , Park SungOg
Published: May 2023

In this paper, we present observations of the Space Radiation Detectors (SRDs)
onboard the Next Generation Small Satellite-1 (NEXTSat-1) satellite. The SRDs, which are
a part of the Instruments for the study of Stable/Storm-time Space (ISSS), consist of
the Medium-Energy Particle Detector (MEPD) and the High-Energy Particle Detector (HEPD).
The MEPD can detect electrons, ions, and neutrals with energies ranging from 20 to 400
keV, and the HEPD can detect electrons over an energy range from 0.35 to 2 MeV. In this
paper, we report an event where particle flux enhancements due to substorm injections
are clearly identified in the MEPD A observations at energies of tens of keV.
Additionally, we report a specific example observation of the electron distributions
over a wide energy range in which we identify electron spatial distributions with
energies of tens to hundreds of keV from the MEPD and with energy ranging up to a few
MeV from the HEPD in the slot region and outer radiation belts. In addition, for an
~1.5-year period, we confirm that the HEPD successfully observed the well-known outer
radiation belt electron flux distributions and their variations in time and L shell in a
way consistent with the geomagnetic disturbance levels. Last, we find that the inner
edge of the outer radiation belt is mostly coincident with the plasmapause locations in
L, somewhat more consistent at subrelativistic energies than at relativistic energies.
Based on these example events, we conclude that the SRD observations are of reliable
quality, so they are useful for understanding the dynamics of the inner magnetosphere,
including substorms and radiation belt variations.
Thick Accretion Disk and Its Super Eddington Luminosity around a Spinning Black
Hole
Authors: Jang Uicheol , Kim Hongsu , Yi Yu
Published: May 2023

In the general accretion disk model theory, the accretion disk surrounding an
astronomical object comprises fluid rings obeying Keplerian motion. However, we should
consider relativistic and rotational effects as we close in toward the center of
accretion disk surrounding spinning compact massive objects such as a black hole or a
neutron star. In this study, we explore the geometry of the inner portion of the
accretion disk in the context of Mukhopadhyay’s pseudo-Newtonian potential approximation
for the full general relativity theory. We found that the shape of the accretion disk
“puffs up” or becomes thicker and the luminosity of the disk could exceed the Eddington
luminosity near the surface of the compact spinning black hole.
Magnetometer Calibration Based on the CHAOS-7 Model
Authors: Song Hosub , Park Jaeheung , Lee Jaejin
Published: May 2023

We describe a method for the in-orbit calibration of body-mounted magnetometers
based on the CHAOS-7 geomagnetic field model. The code is designed to find the true
calibration parameters autonomously by using only the onboard magnetometer data and the
corresponding CHAOS outputs. As the model output and satellite data have different
coordinate systems, they are first transformed to a Star Tracker Coordinate (STC). Then,
non-linear optimization processes are run to minimize the differences between the
CHAOS-7 model and satellite data in the STC. The process finally searches out a suite of
calibration parameters that can maximize the model-data agreement. These parameters
include the instrument gain, offset, axis orthogonality, and Euler rotation matrices
between the magnetometer frame and the STC. To validate the performance of the Python
code, we first produce pseudo satellite data by convoluting CHAOS-7 model outputs with a
prescribed set of the ‘true’ calibration parameters. Then, we let the code autonomously
undistort the pseudo satellite data through optimization processes, which ultimately
track down the initially prescribed calibration parameters. The reconstructed parameters
are in good agreement with the prescribed (true) ones, which demonstrates that the code
can be used for actual instrument data calibration. This study is performed using Python
3.8.5, NumPy 1.19.2, SciPy 1.6, AstroPy 4.2, SpacePy 0.2.1, and ChaosmagPy 0.5 including
the CHAOS-7.6 geomagnetic field model. This code will be utilized for processing
NextSat-1 and Small scale magNetospheric and Ionospheric Plasma Experiment (SNIPE) data
in the future.
A Study of Double Dark Photons Produced by Lepton Colliders using High Performance Computing
Authors: Park Kihong , Kim Kyungho , Cho Kihyeon
Published: May 2023

The universe is thought to be filled with not only Standard Model (SM) matters but also dark matters. Dark matter is thought to play a major role in its construction. However, the identity of dark matter is as yet unknown, with various search methods from astrophysical observartion to particle collider experiments. Because of the cross-section that is a thousand times smaller than SM particles, dark matter research requires a large amount of data processing. Therefore, optimization and parallelization in High Performance Computing is required. Dark matter in hypothetical hidden sector is though to be connected to dark photons which carries forces similar to photons in electromagnetism. In the recent analysis, it was studied using the decays of a dark photon at collider experiments. Based on this, we studies double dark photon decays at lepton colliders. The signal channels are e+e– → AʹAʹ and e+e– → AʹAʹγ where dark photon Aʹ decays dimuon. These signal channels are based on the theory that dark photons only decay into heavily charged leptons, which can explain the muon magnetic momentum anomaly. We scanned the cross-section according to the dark photon mass in experiments. MadGraph5 was used to generate events based on a simplified model. Additionally, to get the maximum expected number of events for the double dark photon channel, the detector efficiency for several center of mass (CM) energy were studied using Delphes and MadAnalysis5 for performance comparison. The results of this study will contribute to the search for double dark photon channels at lepton colliders.
Testing the Consistency of Unified Scheme of Seyfert Galaxies
Authors: Iyida Evaristus U. , Eya Innocent O. , Eze Christian I.
Published: May 2023

The unified scheme of Seyfert galaxies hypothesizes that the observed differences
between the two categories of Seyfert galaxies, type 1 (Sy1) and type 2 (Sy2) are merely
due to the difference in the orientation of the toroidal shape of the obscuring material
in the active galactic nuclei. We used in this paper, a sample consisting of 120 Seyfert
galaxies at 1.40 × 109 Hz in radio, 2.52 × 1017 Hz in X-ray and 2.52 × 1023 Hz in γ-ray
luminosities observed by the Fermi Large Area Telescope (Fermi- LAT) in order to test
the unified scheme of radio-quiet Seyfert galaxies. Our main results are as follows: (i)
We found that the distributions of multiwave luminosities (Lradio, LX-ray, and Lγ-ray)
of Sy1 and Sy2 are completely overlapped with up to a factor of 4. The principal
component analysis result reveals that Sy1 and Sy2 also occupy the same parameter
spaces, which agrees with the notion that Sy1 and Sy2 are the same class objects. A
Kolmogorov-Smirnov test performed on the sub-samples indicates that the null hypothesis
(both are from the same population) cannot be rejected with chance probability p ~ 0 and
separation distance K = 0.013. This result supports the fact that there is no
statistical difference between the properties of Sy1 and Sy2 (ii) We found that the
coefficient of the best-fit linear regression equation between the common properties of
Sy1 and Sy2 is significant (r > 0.50) which plausibly implies that Sy1 and Sy2 are
the same type of objects observed at different viewing angle.
Analysis of Cosmic Radiation Exposure for Domestic Flight Crews in Korea
Authors: Ahn Hee-Bok , Hwang Junga , Kwak Jaeyoung , Kim Kyuwang
Published: May 2023

Cosmic radiation exposure of the flight crews in Korea has been managed by
Radiation Safety Management around Living Life Act under Nuclear Safety and Security
Commission. However, the domestic flight crews are excluded from the Act because of
relatively low route dose exposure compared to that of international flight crews. But
we found that the accumulated total annual dose of domestic flight crews is far from
negligible because of relatively long total flight time and too many flights. In this
study, to suggest the necessity of management of domestic flight crews’ radiation
exposure, we statistically analyzed domestic flight crew’s accumulative annual dose by
using cosmic radiation estimation models of the Civil Aviation Research Institute
(CARI)-6M, Nowcast of Atmospheric Ionizing Radiation for Aviation Safety (NAIRAS), and
Korean Radiation Exposure Assessment Model (KREAM) and compared with in-situ
measurements of Liulin-6K LET spectrometer. As a result, the average exposure dose of
domestic flight crews was found to be 0.5–0.8 mSv. We also expect that our result might
provide the basis to include the domestic flight crews as radiation workers, not just
international flight attendants.
Feasibility Study of Communication Access via Iridium Constellation for Small-Scale Magnetospheric Ionospheric Plasma Experiment Mission
Authors: Song Hosub , Lee Jaejin , Yi Yu
Published: May 2023

The small-scale magnetospheric and ionospheric plasma experiment (SNIPE) is a mission initiated by the Korea Astronomy and Space Science Institute (KASI) in 2017 and comprises four 6U-sized nano-satellites (Korea Astronomy and Space Science Institute Satellite-1, KASISat-1) flying in formations. The main goal of the SNIPE mission is to investigate the space environment in low Earth orbit at 500-km. Because Iridium & GPS Board (IGB) is installed on the KASISat-1, a communication simulation is required to analyze the contact number and the duration. In this study, communication simulations between the Iridium satellite network and KASISat-1 are performed using STK Pro (System Tool Kit Pro Ver 11.2) from the AGI (Analytical Graphics, Inc.). The contact number and durations were analyzed by each orbit and date. The analysis shows that the average access number per day is 38.714 times, with an average of 2.533 times per orbit for a week. Furthermore, on average, the Iridium satellite communication is linked for 70.597 min daily. Moreover, 4.625 min is the average duration of an individual orbit.
Investigation of the Characteristic Nighttime Temperature of Potential Caves on
Mars
Authors: Park Nuri , Hong Ik-Seon , Jung Jongil
Published: May 2023

By providing an environment where energetic particles and micrometeorites can not
penetrate, caves on Mars may serve as a human shelter in future Mars explorations. More
than 1,000 cave entrance candidates have been detected; however, their physical
characteristics that can be utilized in detecting more candidates have not been explored
in detail. In this paper, we explore the nighttime temperature of 100 cave entrance
candidates and their surrounding areas to investigate 1) the nighttime temperature
tendencies relative to their surrounding areas and 2) the extent of these temperature
differences. We find that 79% of the cave entrance candidates exhibit higher
temperatures than the surrounding areas, and 59% show a temperature difference over 20K,
suggesting that the cave entrances may generally show higher temperatures than the
surrounding areas during the nighttime.
Observations for the Ionosphere Using European Incoherent Scatter (EISCAT) in the
Dayside Polar Cap/Cusp and Auroral Region
Authors: Jee Geonhwa , Ji Eun-Young , Kim Eunsol , Kwak Young-Sil , Lee Changsup , Kwon Hyuck-Jin , Kim Ji-Eun , Ham Young-Bae , Lee Ji-Hee , Kim Jeong-Han , Yang Tae-Yong , Kam Hosik
Published: May 2023

Korea Polar Research Institute (KOPRI) and Korea Astronomy and Space Institute
(KASI) have been participating in the European Incoherent Scatter (EISCAT) Scientific
Association as an affiliate institution in order to observe the polar ionosphere since
2015. During the period of December 16–21, 2016 and January 3–9, 2018, the observations
for the polar ionospheric parameters such as the electron density profiles, ion drift,
and electron/ion temperature are carried out in the polar cap/cusp region by the EISCAT
Svalbard radar (ESR). The purpose of the observations is to investigate the
characteristic of the winter ionosphere in the dayside polar cap/cusp region. In this
paper, we briefly report the results of the ESR observations for winter daytime
ionosphere and also the simultaneous observations for the ionosphere-thermosphere system
together with the balloon-borne instrument High-Altitude Interferometer WIND Experiment
(HIWIND) performed by the High Altitude Observatory (HAO), National Center for
Atmospheric Research (NCAR). We further introduce our research activities using
long-term EISCAT observations for the occurrence of ion upflow and the climatology of
the polar ionospheric density profiles in comparison with the mid-latitude ionosphere.
Finally, our future research plans will briefly be introduced.
Fundamentals of Numerical Modeling of the Mid-latitude Ionosphere
Authors: Jee Geonhwa
Published: May 2023

The ionosphere is one of the key components of the near-Earth’s space environment
and has a practical consequence to the human society as a nearest region of the space
environment to the Earth. Therefore, it becomes essential to specify and forecast the
state of the ionosphere using both the observations and numerical models. In particular,
numerical modeling of the ionosphere is a prerequisite not only for better understanding
of the physical processes occurring within the ionosphere but also for the specification
and forecast of the space weather. There are several approaches for modeling the
ionosphere, including data-based empirical modeling, physics-based theoretical modeling
and data assimilation modeling. In this review, these three types of the ionospheric
model are briefly introduced with recently available models. And among those approaches,
fundamental aspects of the physics-based ionospheric model will be described using the
basic equations governing the mid-latitude ionosphere. Then a numerical solution of the
equations will be discussed with required boundary conditions.
Major risk factors and outcomes of the extensively drug-resistant Acinetobacter baumannii acquisition in a Moroccan surgical intensive care unit
Authors: Hilmi Adel , Aitsaid Loubna , Ouafi Ahmed Tadlaoui , Zahlane Kawtar
Published: May 2023

Acinetobacter baumannii has emerged as an important nosocomial pathogen causing worldwide hospital outbreaks. The aim of this study was to determine the antibiotic resitance profile, the risk factors and outcomes related to the acquisition of extensively drug-resistant A. baumannii.
قصيدة "أحيا وأيسر" للمتنبي: دراسة في ضوء علم نحو النص
Authors: ÖMEROĞLU Elif Nur
Published: May 2023

يتناول هذا البحث مفهوم علم نحو النص وتطبيقه على قصيدة "أحيا وأيسر" للمتنبي (ت 354هـ) دراسةً نصيةً، ويهدف إلى تحليل القصيدة بحسب معايير علم نحو النص. فقد بذل القدماء من علماء العرب الكثير من الجهد لفهم بُنية الجمل والكلمات والأصوات، وقد حاولوا دراسة اللغة من مختلف النواحي. وفي العصر الحديث تجاوز علماء اللغة دراسة الأصوات والكلمة والجملة، فدرسوا النص كاملًا، وقاموا بتحديد المزايا التي تجعلُ النص نصًّا، والعناصر التي توفر الانسجام والاتساق في النص. ونتيجةً لذلك، ظهر علم نحو النص، وهدفه الأبرز هو تحديد كون النص منسجمًا أو غير منسجمٍ. أما المنهج المتبع في هذا البحث فهو المنهج الوصفي التحليلي، حيث تطرق إلى تعريف نحو النص ونشأته وأهدافه وإسهاماته في فهم النص مع تعريف معاييره السبعة، وهذه المعايير هي: السبك، والحبك، والتناصُّ، والقصدية، والمقامية، والمقبولية، والإعلامية. بعد ذلك، حُلِّلت القصيدة التي يقوم عليها موضوع البحث وفقًا لهذه المعايير. وخلاصة البحث هي أن علم نحو النص الذي وضع أُسُسَه اللغوي فان ديك Van Dijk هو علمٌ وصفيٌّ حديثٌ، يتداخل في مناهجه مع عددٍ من العلوم اللغة الأخرى، كما أن القصيدة التي نظمها المتنبي هي نصٌّ متماسكٌ وفقًا لمنهج نحو النص، وتحققتْ فيها كلُّ المعايير بنسبٍ متفاوتةٍ.
Determination of polycyclic aromatic hydrocarbons in water using dispersive liquid-liquid microextraction-gas chromatography-mass spectrometric
Authors: Imrigha Nada Abusalah , Sanagi Mohd Marsin , Sharef Sarra Younes
Published: May 2023

For the extraction of polycyclic aromatic hydrocarbons (PAHs) from water samples, a new sample preparation approach based on dispersive liquid-liquid microextraction (DLLME) was developed. In this procedure, a water sample was injected with a mixture of carbon tetrachloride, CCl4 (extraction solvent), and acetone (disperser solvent) to generate an emulsion in which the PAHs were extracted into fine droplets of extraction solvent. The impacts of several extraction parameters were explored, including extraction solvent type, disperser solvent type, extraction solvent volume, and disperser solvent volume. For phenanthrene and fluoranthene, the calibration curve correlation coefficient (r2) was 0.9993 and 0.9973, respectively. For phenanthrene and fluoranthene, the limits of detection (LODs) were 0.0008 g/mL and 0.0006 g/mL, respectively. For phenanthrene and fluoranthene, the relative standard deviations (RSDs) were 10.69 percent and 9.72 percent, respectively. The analyte recovery rates ranged from 100.5 to 107.8%. Phenanthrene and fluoranthene were discovered in the samples.
دراسة معدل انتشار بعض الأوليات الطفيلية المعوية المسببة للإسهال بين الأطفال في مدينة سبها، ليبيا
Authors: الشريف فاطمة , إبراهيم حسن
Published: May 2023

أجريت هذه الدراسة حول تحديد معدل انتشار نوعين الطفيليات المعوية الأولية المسببة للإسهال هما طفيلي Entamoeba histolytica وGiardia lamblia بين الأطفال في مدينة سبها. خلال هذه الدراسة تم جمع 262 عينة براز (138 ذكور و124 إناث) تراوحت أعمارهم من شهر إلى 14 سنة في الفترة من سبتمبر 2019 إلى فبراير 2020. سجلت بيانات كل طفل من الجنس، العمر، ومكان السكن. جميع العينات فحصت بالطريقة المباشرة والتركيز بالفورمالين والإيثر. أشارت نتائج الدراسة أن معدل انتشار الإصابة الكلية بهذين الطفيلين كان 6.5% (3.4% ,Entamoeba histolytica/dispar 3.1% Giardia lamblia) مع عدم وجود فرق معنوي بينهما في معدل انتشار الإصابة (p=0.572). كما أوضحت الدراسة أن معدل الإصابة في البنات كان 7.3% وهو أعلى من الأولاد 5.8% مع عدم وجود فرق معنوي بينهما (p=0.409). أعلى معدل لانتشار الإصابة كان 8.1% في الفئة العمرية 5-9 سنوات مع عدم وجود أي فروقات إحصائية بين الفئات العمرية المختلفة. كما أسفرت النتائج عن وجود فرقا معنويا (p=0.001) في معدل انتشار الاصابة عند الفحص بطريقتي المباشرة (4.2%) وطريقة التركيز (6.5%). تبعا لمكان السكن، أشارت النتائج أن أعلى نسبة إصابة كانت في منطقة حجارة بنسبة 25%. تهدف هذه الدراسة إلى تحديد معدل انتشار اثنان من الطفيليات الأولية المسببة للإسهال في الأطفال في مدينة سبها وهما طفيلي الإنتاميبا هستوليتيكا والجيارديا لامبيليا.
Determination of Stoichiometry and Stability Constant of Cd(II) and Zn(II) Complexes with Pyrazole Based Ligands in Mixed Solvent (EtOH-H2O)
Authors: Elsherif Khaled Muftah , Zubi Ahmed , Najar Adel , Bin Ghashir Hamida
Published: May 2023

A Spectrophotometric investigation was applied on the complexation of 1,3-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,3-PPB) and 1,4-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,4-PPB) with Zn(II) and Cd(II) ions in a mixed (1:1) solvent of water and ethanol. The mole ratio methodology was used to calculate the stoichiometry, molar absorptivity, and stability constant values. Some experimental conditions have been investigated, including pH, ionic strength, solvent composition, and time. The results revealed the production of 1:1 complexes. In terms of ligands, 1,4-PPB was more stable than 1,3-PPB, whereas Cd(II) complexes were more stable than Zn(II) complexes. The complexes' molar absorptivity values were determined to be 5744, 10019, 9414, and 17716 l.mol-1.cm-1 for Cd-1,3-PPB, Cd-1,4-PPB, Zn-1,3-PBB, and Zn-1,4-PBB, respectively. The sensitivities for Cd and Zn estimation by complexation with 1,3-PPB and 1,4-PPB, respectively, were determined to be 0.051, 0.089, 0.114, and 0.271 mg.l-1.
Histopathological Changes in Rat Testes Induced by Potassium Bromate and Potential Ameliorative Effects of Ruta chalepensis Oil Extract
Authors: إبراهيم سالم الدرسي  , قاسم محمد عطية  , ابتسام مفتاح محمد غيث  , مبروكة عبدالوهاب صالح  , عبدالله علي القاسي  , عبدالسلام موسى بوالحاج
Published: May 2023

Potassium bromate (KBrO3) is used as a food additive mainly in the bread-making process. Ruta chalepensis (R. chalepensis) is an excellent and valuable bioactive plant that produces a range of complex flavonoids. The present study was aimed to investigate the possible protective and therapeutic effect of R. chalepensis against KBrO3 toxic effects on rat testis using histopathology investigation. Fifty adult male albino rats were used in the present study. The rats were divided into five groups each containing 10 rats. First group was kept as control, second group received oil extract of R. chalepensis, third group was treated with KBrO3, forth group (Protective group) and fifth group (Therapeutic group). All groups of animals were sacrificed at 2 and 4 weeks. The results of the present study showed that the administration of R. chalepensis caused disarrangement of spermatogonia throughout the lumen of seminiferous tubule. Additionally, abnormal widening of interstitial spaces with degeneration of interstitial cells. There was necrosis to the spermatocytes with inhibition of the spermatogenic process. KBrO3 group showed necrosis of seminiferous tubule, loss in some spermatogenic cells. There were fibrous stroma between the seminiferous tubules. Also revealed vacuolation, edematous, hyalinization and loss of interstitial connective tissue cell with haemorrhage between seminiferous tubules. Protective group showed seminiferous tubule atrophy, disrupted germ cell layers and disappearance of Leydig cells. The therapeutic group, showed interstitial hemorrhage, with necrosis in spermatogonia and vacuolation. It may be concluded that KBrO3 is toxic to testis and R. chalepensis at the tested dose is not beneficial as protective and curative agent.
Effects of Ethephon treatments on Ripening and Uniformity of Fig Fruit (Ficus carica. L)
Authors: مرعي محمود عبدالله  , إدريس أحمد الجهاني  , إدريس عبدالعزيز الطويل
Published: May 2023

The current experiment was carried out to determine the effect of the application of ethephon on the maturation of “Peter” figs. Fig fruits were treated with three aqueous concentrations of ethephon (500, 1000, and 1500 ppm) during the developmental stage. The physic-chemical characteristics, such as fruit weight, fruit length, fruit diameter, total soluble solids (TSS), and fruit acidity were recorded and analysed. The results showed that ethephon application during the developmental period of the fig fruits significantly accelerated fruit ripening and enhanced the fruits’ uniformity. Fig fruits treated with ethephon showed increased TSS compared to untreated fruits, and the acidity of the treated fruit decreased compared to that of untreated fruits.  Additionally, TSS/ acidity ratio was significantly higher in 1500 ppm treatment in comparison with other treatments. On the basis of our data, we conclude that the application of ethephon to fig fruit increases ripening and uniformity of the fruit.
Integrated Effect of Fertilizers on Soil pH, EC and Organic Matter Content
Authors: حسين عبدالسلام مخلوف  , حسن  عبدالمولي محمد  , جمعه احمد لبيب  , مفتاح علي امحمد
Published: May 2023

Two field experiments in split-plot design were carried out in the winter season of  2014-2015 at Mansoura University Farm, Egypt, to investigate the effect of biochar, compost, and chicken manure with different rates of mineral fertilization on soil pH, EC, and organic matter content. Treatments of organic were biochar, compost, and chicken manure, while the studied mineral fertilizer treatments (NPK) took with rates of 50,75,100, and 125 %. The obtained results can be summarized in; biochar, addition led to an increase in the pH of wheat (Sakha 68) soil by 8.73 %, compost, and chicken manure decreased the pH of wheat soil by 8.30 and 8.19% compared with 0.0 organic addition, where the same amendment with the same order increased pH of barley (Gemmiza 123) soil by 8.65, and reduce with 8.30 and 8.18% of compost and chicken manure. Biochar, compost, and chicken manure treatments increased values of  EC 2 , 2.43, and 2.10 dS m-1 of wheat soil and 2.80, 2.23, and 2.14 dS m-1 of barley, respectively. Organic matter improved and the highest result was found with chicken manure 2.798 and 2.767 % of wheat and barley soil. Mineral fertilizer decreased both pH of wheat and barley soil as well as increased EC and organic matter up to the highest level used. A significant organic fertilizer type - mineral fertilization dose interaction was found with the most of tested treatments. The highest effect on pH in soil paste was found in the interactions between biochar with mineral treatments compared to other treatments of both wheat and barley soil. The best mean value of EC was recoded with the interaction between compost and 100 % NPK treatment (2.76 dS m-1) of wheat soil, a similar trend was also achieved with barley soil (3.29 dS m-1). Chicken manure -125 % of recommended NPK treatment gave the heights values of wheat and barley organic matter content, 2.798 and 2.767 %.  Respectively.
Avaliação da qualidade do leite de cabra na Fazenda Padre Cícero no Município de Monteiro - PB.
Authors:   , Victor Inácio dos Santos João
Published: May 2023

O leite de cabra é uma matéria prima rica em gordura e vitaminas, o qual possui um potencial gigantesco para a produção de derivados lácteos, a Paraíba detém um total de 546.026 caprinos leiteiros, com uma produção média anual de 5.627,000 litros de leite correspondente a 22% da produção total do país. Por esse motivo o objetivo desse trabalho foi avaliar a qualidade do leite de cabra na fazenda Padre Cícero no município de Monteiro-PB. O trabalho foi realizado na fazenda Padre Cícero, sendo iniciado em outubro de 2018 e encerrado em março de 2020, as análises físico-químicas foram realizadas no laboratório de tecnologia de alimentos, no Centro de Desenvolvimento Sustentável do Semiárido, através do Analisador de Leite Ultrassônico Complete – AKSO, para os parâmetros de composição do leite: gordura (%), sólidos não gordurosos SNG (%), sólidos totais ST (%), proteína (%), lactose (%), minerais (%), densidade, a contagem de Células Somáticas foi realizada no aparelho LACTOSCAN Somatic Cells Counter. Todos os parâmetros analisados estavam de acordo com a Instrução Normativa de n° 37. A contagem de células somáticas obteve valores abaixo de 1.000.000, chegando em algumas médias mensais a valores acima de 2.000.000 células/mL. Ao final desse trabalho foi possível concluir que o leite de cabra analisado está em ótimas condições para a produção de derivados lácteos e o próprio consumo in natura.
Introduction of the Lymphatic System and Invitation to Lymphatic Research
Authors: Suami Hiroo
Published: May 2023

The lymphatic system has been the least investigated field in Medicine and Biology. The conventional topic of the lymphatic system has been cancer treatment because cancer cells tend to travel through the body via the lymphatic vessels. However, scientists gradually realise the critical need for further investigation because some medical conditions are believed to link to the dysfunction of the lymphatic system.
I investigate the lymphatic system since 2001. First, I developed a new technique to visualise the lymphatic vessel in human and animal cadavers in 2005 and was awarded by the US plastic surgery research society in 2005. Currently, I operate an infrared imaging device for lymphoedema patients and provide a diagnostic imaging service at Macquarie University.
In this talk, I would like to introduce the lymphatic system and the current and potential applications of bioengineering to this field. No special knowledge is required for my talk because most of my slides include visual materials.
Prediction of Wave Localization in 2D Disordered Vibrating Systems
Authors: Lefebvre Gautier
Published: May 2023

As a general physical phenomenon, localized waves have been studied in optics, electromagnetism, acoustics and many physical domains. Strong or Anderson localization and weakly localized waves have special attention in optics and in quantum mechanics, due to the disordered media, but also can be found in mechanical waves.

In this seminar, I will present results about several systems displaying wave localization in the field of vibrations. When the localization is produced by complex boundary conditions, the landscape of localization theory allows to predict the position and frequency of the localized modes. Experimental results demonstrate that it is possible to obtain this information from a simple static deformation measurement, without knowing precisely the details of the geometry or physical properties [1,2]. Another way to stimulate localization is to create a dense assembly of scatterers, or use a quasi-periodical structure. We investigate localization properties of an elastic plate with closely disposed non-through holes, as resonating scatterers. The measurement of the wavefield in the full plate and the scatterers themselves reveals specific properties of the localized modes.
Quality Care in Outpatient Chemotherapy. Design and Validation of the Novel Care Quality Ambulatory Instrument
Authors: Osorio-Castaño Jhon Henry , Vallejo-Mesa Herlin Yeidy , Adarve-Gutierrez Sandra Eugenia , Osorio-Vargas Jenny Alejandra
Published: May 2023

Introduction: Neither validated scales nor scales translated into Spanish currently exist to evaluate the perception of quality care in people receiving outpatient chemotherapy, despite their usefulness in evaluating the care provided by nurses and in promoting changes in the delivery of these services. Objective: To design and validate the novel Care Quality Ambulatory-I (CQAMB-I) instrument in outpatient chemotherapy services. Materials and methods: This is an instrument validation study carried out in three stages: literature review, design, and validation of the instrument. Content validation was performed with 14 specialists with at least a master’s degree and experience in chemotherapy or quality services; face validation was carried out through a pilot test with 31 participants diagnosed with cancer who received curative chemotherapy, and construct validation was carried out through an exploratory factor analysis with 436 users who received outpatient chemotherapy with curative intent. Results: A total of 15 items were removed in the content validation stage; none were removed in face validation. In construct validation, participants had a median age of 56 years, a median treatment time of 5 months, and breast cancer was the most commonly diagnosed form of cancer. Eighteen models were run, 30 items were removed, 6 factors emerged, and a KMO of 0.80 and a Cronbach’s alpha of 0.82 were obtained. Conclusion: The CQAMB-I proved to be valid and reliable for the evaluation of quality care in outpatient chemotherapy services. Additionally, it enabled expanding the conception of such care beyond the attributes of structure, process, and outcome.
Diversidad funcional y relaciones sexoafectivas en Sex Education (Netflix): el caso de Isaac y Maeve
Authors: García-Ramos Francisco-José , Villamar-Prevost Ángel-Samuel
Published: May 2023

Este artículo aborda la representación de la diversidad funcional y las relaciones sexoafectivas entre adolescentes dentro de la serie de ficción Sex Education durante la segunda y tercera temporadas (2020-2021), coincidiendo con la aparición del personaje de Isaac, un chico con diversidad funcional. A partir de una metodología basada en el análisis de discurso de los personajes y de los relatos sobre la diversidad funcional, se explora la construcción de Isaac como sujeto deseante y deseado, así como su relación sexoafectiva con Maeve. Se concluye que Sex Education visibiliza, reivindica y normaliza las necesidades afectivas y sexuales de la juventud con diversidad funcional, evitando caer en un discurso donde impera la infantilización, la patologización y la asexualidad, al tiempo que abre a los personajes con diversidad funcional un horizonte de posibilidad para amar y consumar relaciones sexuales. Asimismo, la serie plantea un escenario donde la igualdad y la integración son un éxito consumado en la sociedad y sitúan las dificultades y violencias a las que se enfrenta Isaac como una excepción, más que como un problema social estructural.
A strategic analysis of sustainable transportation on Lake Van
Authors: KARACA İsmail , SÖNER Ömer
Published: May 2023

The Sustainable Development Goals (SDGs) are aimed to provide a comprehensive framework for all economies /industries to work toward a more prosperous and environmentally friendly future. Maritime transport and its subsectors like Inland Waterway Transportation (IWT) are needed to attain most SDGs. Thus, it must raise awareness of how the marine industry, its sub-sectors, and scientific research contribute to SDG achievement. Accordingly, the present study is dedicated to providing a broad direction for initiatives through further strengthening Van Lake's contribution to the SDGs by accurately identifying impediments and exploring possible and present issues. In addition, as Lake Van and its surroundings were recently designated as a "naturally protected, sustainable conservation, and managed area", it should be appropriately conserved in addition to the actions taken to mitigate climate change impacts. The Strengths, Weaknesses, Opportunities, and Threats (SWOT) analysis is used in this study, which is one of the most well-known and robust approaches for strategic analysis. The study's findings highlight both the importance of improving communication among the shareholders to build cooperative connections and developing new ways to integrate the SDGs into regulatory and policy plans to innovative infrastructure planning and investment solutions. In this study, a SWOT analysis of IWT activities in Lake Van has been made, and the strengths and weaknesses, remarkable opportunities, and possible threats to sustainable maritime transportation in Lake Van are determined.