bluuebunny/crossref_metadata_2025_split huggingface dataset:
Principal Specialization of Dual Characters of Flagged Weyl Modules
Authors: Mészáros Karola , St. Dizier Avery , Tanjaya Arthur 
Published: November 2021

Schur polynomials are special cases of Schubert polynomials, which in turn are special cases of dual characters of flagged Weyl modules. The principal specialization of Schur and Schubert polynomials has a long history, with Macdonald famously expressing the principal specialization of any Schubert polynomial in terms of reduced words. We prove a lower bound on the principal specialization of dual characters of flagged Weyl modules. Our result yields an alternative proof of a conjecture of Stanley about the principal specialization of Schubert polynomials, originally proved by Weigandt.
CERAMIC STAMPS FROM VILINO (RASSADNOE) — IN PERIODIZATION AND CHRONOLOGY OF THE SITE (SOUTH-WESTERN CRIMEA)
Authors: Medvedev G. V. 
Published: November 2021

This paper is devoted to the publication of amphora stamps discovered during excavation at the settlement of Vilino (Rassadnoe) in 2008—2014.
During the research of the settlement the eastern border of the ancient estate and the main chronological framework of the settlement life were ascertained. The stone monumental structure was discovered in 2008. This is the cistern for collecting and storage of rainwater. In the Late Scythian time it was used as a burial structure (crypt).
Ceramic stamps found at the site are represented by such centers as Sinopa, Chersonesos, Rhodes. Unfortunately not all of them were discovered in the cultural layers (in situ) and some were found in disturbed layers, at the surface or in the looter’s holes. Nevertheless, with a lesser or greater degree of probability, it’s possible to correlate them with the chronology of the settlement and periods of its life.
On the excavated areas of the site four building periods (A—D) were observed — two Classic and two Late Scythian. The first period is associated with the time of activity of the Greek fortified estate (Chersonesos Сhora) from the last quarter of the 4th to the early 3rd century BC. In the second period, after a break, the population has come back to the settlement in the last quarter of the 3rd century BC. There was the period of recolonization during which the restructuring of the settlement has carried out. At the end of the first quarter of the 2nd century BC the life at the settlement was stopped. The next two periods correspond to the Late Scythian culture. However, the layers and building remains of the late 2nd century BC — 1st century AD was destroyed by plowing and looter’s holes. The upper horizon of the settlement contains the material from the 1st—3rd centuries AD.
The stamps and other archaeological material are important chronological indicators of the archaeological site in the system of the Chora of Chersonesos and in the whole Western Crimea.
GRAFFITI FROM THE WESTERN OUTSKIRTS OF OLBIA PONTICA
Authors: Rusiaieva A. S. , Kuzmishchev A. G. , Fornasier J. 
Published: November 2021

This paper is preliminary review of a small collection of graffiti from the latest excavations on the western outskirts of Olbia Pontica (the so-called «suburbs») in 2015—2020, and their introduction into scientific circulation.
The excavations were conducted by the Olbia International Archaeological Expedition led by A. V. Bujskikh as the part of Ukrainian-German multidisciplinary project (co-directors A. V. Bujskikh and J. Fornasier). The researches on the suburbs were headed by A. G. Kuzmischev and J. Fornasier. Over six years of research in various cultural strata and in the fillings of half-dugouts, pits and other objects more than 50 graffiti have been found, inscribed mainly on the fragments of Attic black-lacquered tableware of the 5th—4th centuries BC. Emphasis is placed on determining the main types of inscriptions and their features. Regardless of the year and location of discovery they are divided into five groups: A. Abbreviated anthroponyms or individual words; B. Initials of proper names or one-letter marks; C. Graffiti on treated ostracons; D. Various digital signs and records; E. Graffiti of unclear meaning. The collection under study significantly supplemented the source base of the small epigraphy of the Olbia polis. However, no original, rare and to some extent important informative inscriptions which were recorded in temenos, residential neighborhoods, in some settlements and in Borisfen have been found yet here. In addition the damage of many graffiti makes impossible to interpret them reliably. In no one case we could identify reliably the inscriptions dedicated to any deities. Instead, the large number of abbreviated names and initials of the owners of dishes coincides with a significant import of Attic black-lacquered ceramics in the life of the inhabitants of the suburbs in the 5th—4th centuries BC. Despite the relatively limited number, processed ostracons have replenished this category of Olbia votive finds by the original graffiti of magical significance. At the same time, the fact that in general in the suburbs is a lot of graffiti with digital markings which are most often attributed to traders, deserves special attention. Of course, in the future, all the graffiti from the suburbs need a more detailed visual study both as the fragments of ceramics and their exact professional sketches, and comparative analysis of this type of inscriptions from many ancient Greek sites.
THE SHIP WRECK OF THE LATE 4th / EARLY 3rd CENTURY BC NEAR KINBURN SPIT
Authors: Gerasimov V. Ye. , Reida R. M. , Smyrnov O. I. , Prejs P. , Loizou E. 
Published: November 2021

During the campaign of 2018 the international underwater archaeological expedition has explored the waters of Tendra Spit and Kinburn Spit on the shelf of the Black Sea, in Mykolaiv and Kherson regions of Ukraine. Underwater archaeological exploration focused on the waters near the northern tip of Tendra Spit, from both the Gulf of Tendra and the sea, and north-western tip of Kinburn Spit. In addition to the visual reconnaissance, divers were using sonar, profiler and side-scan sonar. As a result, the bathymetric map has been compiled. In the initial part of research the work was limited to mapping and taking photographs of the discoveries. During these works was discovered and cleansed the ancient Shipwreck of the late 4th — early 3rd century BC. It was possible to identify the well-preserved fragment of the hull of ancient Wreck of a length of 9.45 m in situ with ballast stones, ceramic material from the cargo, lead plating and him constructions elements. After clearing of the sand from the preserved part of the ship hull with the help of a hydro injector the video and photo documentation was carried out. As a result of these works, large-scale photo mosaic of the object and its 3D-model were made. The condition of the wooden hull is excellent, the technological holes, connections, bronze and iron nails are preserved.
Outside of Ukraine several shipwrecks of the same period are attested. The best studied are the following: shipwreck of the 3rd century BC at Grand Congloue, France; the Mazotos shipwreck of the 4th century BC in Cyprus; the Porticello shipwreck of the end of the 5th or beginning of the 4th century BC in Italy; the Alonnisos shipwreck from the end of the 5th century BC, Greece; the Kyrenia shipwreck from the end of the 4th — beginning of the 3rd centuries BC in Cyprus. In the Black Sea, in 2011 a shipwreck from the end of the 4th — beginning of the 3rd centuries BC near Eregli, Turkey (ancient Herakleia Pontica) was discovered by a deep-sea expedition of the research vessel «Nautilus» under the direction of Michael Brennan at a depth of 101 m. Most of the known merchant ships of this period were small, ranging from 12 to 17 m (table). Boris Peters provides a reconstruction sketch of the Lake Donuzlav ship of the late 4th — early 3rd centuries BC. It is almost identical to the reconstruction of the Kyrenia merchant ship, based on its hull which was preserved by 75 %, The replica named «Kyrenia 2» was built and made several voyages. It can be assumed that the Kinburn Spit ship found in 2018 was of similar appearance but further research will provide more detailed information.
DECORATIONS FROM SHELLS IN THE ADORNMENTS OF EARLY MEDIEVAL SLAVS
Authors: Volodarets-Urbanovіch Ya. V. 
Published: November 2021

The pendant from Luka-Kavetchyna, dwelling 25 (fig. 2: 1; 3) is the earliest find from the Slavs sites da­ting to the second quarter — the end of the 5th century. The adornment was made of a shell of the genus Murex and is the «legacy» from the Cherniakhіv culture. In the area of that culture are known the pendants made of shells of this genus (type 2 by O. Hopkalo).
The pendants from shells appear in use of the Slavs since the second half of the 6th century. Their varieties were used until the first half of the 8th century, although the assemblages and finds with them are few (table 1; fig. 1; 14). In the Slavic assemblages the shells of mollusks of the following species were occurred: Cypraea moneta, C. pantherina, C. tigris, C. arabica. The items from Murex shells are also known. The height of Cypraea moneta is a little more than 2 cm. Other species of shells are larger reaching the height ca. 7—8 cm.
The assemblages of the Martinіvka circle include Khatski (fig. 4: A) and Khittsі ones. The grave from Mokhnach belongs to the same antiquities (fig. 2: 2; 5—7). The jewellery by Martynivka circle are dated back to the second half of the 6th century, and the hoards were hidden in the middle — the third quarter of the 7th century. The Pastyrsky circle hoards include the assemblages from Zaitsevo (fig. 4: B) and Kharіvka (fig. 8—10). The hoards by Pastyrsky circle were hidden in the first half of 8th century.
The appearance of the pendants from shells is related to the general trend of the spread of Cypraea moneta in Eastern Europe in the early Middle Ages. They are known in the Caucasus, Crimea, the Seversky Donets basin (fig. 11). Cypraea moneta shells were used as pendants in necklaces as evidenced by finds from the Luchiste burial ground from Crimea. The use of other types of shells remains unclear. However, they were probably parts of necklaces or amulets.
SARMATIAN BURIALS EXCAVATED BY DMYTRO BEREZOVETS AT THE LOWER DNIEPER BASIN
Authors: Symonenko A. V. 
Published: November 2021

During the campaigns of 1951 and 1953 Dmytro Berezovets excavated the Sarmatian graves near the Kut, Hrushivka and Marianske villages of Apostolovski district of Dnipropetrovsk region. These materials were published briefly, without typological and chronological definitions and analysis of the historical context, with illustrations of rather low quality. Moreover, there was some confusion and errors later made by some researchers, including the author, which have been replicated with each reference. Therefore, it is worthy to republish these materials from the standpoint of the current level of the Sarmatian studies in order to correct certain errors as well.
Dmytro Berezovets has discovered the assemblages both of Early Sarmatian (Kut, Hrushivka, Maryanske, barrow 3, grave 4) and Middle Sarmatian Age (Marianske, barroow 5, graves 5—7; barrow 5, grave 6; barrow 6, grave 14) according to traditional chronology. All Sarmatian burials under study were the secondary graves in the Bronze Age mounds and Scythian ones. The skeletons lied supine, with their heads directed to Northern sector. Among the grave goods are the Roman and Sarmatiam pottery, simple bronze adornment, cornelian, jade and glass beads, bronze mirror, bone ritual spoon etc. The Early Sarmatian assemblages discovered by Dmytro Berezovets are dated to the late 2nd—1st century BC, the Middle Sarmatiam ones to the 1st—2nd centuries AD. The identical funeral rite of the graves of different date near Marianske once again confirms the validity of the periodization proposed by me in due time, according to which all the graves under study belong to different phases of the first period (phase A2 — Kut, Hrushivka, Marianske, barrow 3, grave 4; phase B — Marianske, barrow 3, graves 5—7; barrow 5, grave 6; barrow 6, grave 14).
htof: A New Open-source Tool for Analyzing Hipparcos, Gaia, and Future Astrometric Missions
Authors: Brandt G. Mirek , Michalik Daniel , Brandt Timothy D. , Li Yiting , Dupuy Trent J. , Zeng Yunlin 
Published: November 2021

Abstract
We present htof, an open-source tool for interpreting and fitting the intermediate astrometric data (IAD) from both the 1997 and 2007 reductions of Hipparcos, the scanning law of Gaia, and future missions such as the Nancy Grace Roman Space Telescope (NGRST). htof solves the astrometric parameters of any system for any arbitrary combination of absolute astrometric missions. In preparation for later Gaia data releases, htof supports arbitrarily high-order astrometric solutions (e.g., five-, seven-, and nine-parameter fits). Using htof, we find that the IAD of 6617 sources in Hipparcos 2007 might have been affected by a data corruption issue. htof integrates an ad hoc correction that reconciles the IAD of these sources with their published catalog solutions. We developed htof to study masses and orbital parameters of substellar companions, and we outline its implementation in one orbit fitting code (orvara). We use htof to predict a range of hypothetical additional planets in the β Pic system, which could be detected by coupling NGRST astrometry with Gaia and Hipparcos. htof is pip installable and available at https://github.com/gmbrandt/htof.
Energetic Particles Associated with a Coronal Mass Ejection Shock Interacting with a Convected Magnetic Structure
Authors: Giacalone J. , Burgess D. , Bale S. D. , Desai M. I. , Mitchell J. G. , Lario D. , Chen C. H. K. , Christian E. R. , de Nolfo G. A. , Hill M. E. , Matthaeus W. H. , McComas D. J. , McNutt R. L. , Mitchell D. G. , Roelof E. C. , Schwadron N. A. , Getachew Tibebu , Joyce C. J. 
Published: November 2021

Abstract
On 2020 November 30, Parker Solar Probe (PSP) was crossed by a coronal mass ejection (CME)-driven shock, which we suggest was also crossing a convected, isolated magnetic structure (MS) at about the same time. By analyzing PSP/FIELDS magnetic field measurements, we find that the leading edge of the MS coincided with the crossing of the shock, while its trailing edge, identified as a crossing of a current sheet, overtook PSP about 7 minutes later. Prior to the arrival of the shock, the flux of 30 keV–3 MeV ions and electrons, as measured by PSP/Integrated Science Investigation of the Sun (ISOIS)/Energetic Particle Instrument (EPI-Lo), increased gradually, peaking at the time of the shock passage. However, during the crossing of the MS downstream of the shock, the energetic-ion flux dropped dramatically, before recovering at about the time of the crossing of the trailing edge of the MS. Afterwards, the ion fluxes remained approximately constant within the sheath region of the CME shock. We interpret this depletion of energetic ions within the MS as the result of insufficient time to accelerate particles at the shock within the MS, given that the structure moves along the shock surface owing to its advection with the solar wind. We present results from a quantitative numerical model of the interaction of an idealized MS with a shock, which supports this interpretation.
Evidence for Gravitational Lensing of GRB 200716C
Authors: Yang Xing , Lü Hou-Jun , Yuan Hao-Yu , Rice Jared , Zhang Zhao , Zhang Bin-Bin , Liang En-Wei 
Published: November 2021

Abstract
Observationally, there is a small fraction of gamma-ray bursts (GRBs) with prompt emission observed by Fermi/GBM that are composed of two pulses. Occasionally, the distance to a GRB may be lensed when a high mass astrophysical object resides in the path between the GRB source and observer. In this paper, we describe GRB 200716C, which has a two-pulse emission and duration of a few seconds. We present a Bayesian analysis identifying gravitational lensing in both temporal and spectral properties, and calculate the time delay (Δt ∼ 1.92 s) and magnification (γ ∼ 1.5) between those two pulses based on the temporal fits. One can roughly estimate the lens mass to be about 2.4 × 105
M
⊙ in the rest frame. We also calculate the false alarm probability for this detection to be about 0.07% with trial factors, and a present-day number density of about 808Mpc−3 with an energy density Ω ∼ 1.4 × 10−3. If the first pulse of this GRB near the trigger time is indeed gravitationally echoed by a second pulse, GRB 200716C may be a short GRB candidate with extended emission.
White-light Continuum Observation of the Off-limb Loops of the SOL2017-09-10 X8.2 Flare: Temporal and Spatial Variations
Authors: Zhao Junwei , Liu Wei , Vial Jean-Claude 
Published: November 2021

Abstract
Observations of the Sun’s off-limb white-light (WL) flares offer rare opportunities to study the energy release and transport mechanisms in flare loops. One of the best such events was SOL2017-09-10, an X8.2 flare that occurred near the Sun’s west limb on 2017 September 10 and produced a WL loop system lasting more than 60 minutes and reaching an altitude higher than 30 Mm. The event was well observed by a suite of ground- and space-based instruments, including the Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI) that captured its off-limb loops in WL continuum near Fe i 6173 Å, and the Atmospheric Imager Assembly (SDO/AIA) that observed its ultraviolet (UV) and extreme-ultraviolet (EUV) counterparts. We found quasi-periodic pulsations in the WL and UV emissions at the flare loop-top with a period around 8.0 minutes. Each pulsation appears to have an EUV counterpart that occurs earlier in time and higher in altitude. Despite many similarities in the WL and UV images and light curves, the WL flux at the loop-top continues to grow for about 16 minutes while the UV fluxes gradually decay. We discuss the implication of these unprecedented observations on the understanding of the enigmatic off-limb WL flare emission mechanisms.
COPD sleep phenotypes: Genesis of respiratory failure in COPD
Authors: Vaidya Sameer , Gothi Dipti , Patro Mahismita 
Published: November 2021

The chronic obstructive pulmonary disease (COPD) patients could have respiratory failure during sleep without daytime overt arterial blood gas (ABG) abnormality. We undertook a study first of its kind to attempt in distinguishing the underlying pathophysiological mechanisms. It was a prospective observational study in stable COPD patients. The inclusion criterion was presence of day time PaO2>60 mmHg and PaCO2<45 mmHg. Twenty five out of 110 patients were excluded because of the ABG abnormality. The remaining 85 patients were subjected to overnight pulse oximetry and end-tidal (ET)-CO2 monitoring. The nocturnal oxygen desaturation was defined as per Fletcher’s criteria. The nocturnal hypoventilation was defined as per American academy of sleep medicine (AASM) guidelines. Patients having saw-tooth pattern on pulse oximetry and/or snoring were subjected to polysomnography. 38/85(44.8%) patients had nocturnal gas exchange abnormality in absence of daytime respiratory failure and were identified into 3 different phenotypes: obstructive sleep apnoea (OSA), nocturnal hypoventilation and nocturnal oxygen desaturation. The isolated abnormality was seen in 24 patients: 10 patients had OSA, 9 had nocturnal hypoventilation and 5 had nocturnal oxygen desaturation. Overlap of two or more phenotypes was seen in 14 patients. As compared to the nocturnal hypoventilation and desaturation phenotypes, the OSA phenotype had a significantly higher BMI & FEV1. The nocturnal hypoventilation and the desaturation phenotypes did not have significant difference in FEV1 and BMI, but the daytime SpO2 and PaO2 differed significantly. Such parameters could help in identifying the three distinct COPD-sleep phenotypes (OSA, nocturnal hypoventilation and nocturnal oxygen desaturation). A phenotype based nocturnal management may help in delaying the process of overt respiratory failure in COPD.
Effects of Dimethoate Insecticide on Serum Biochemistry of African Catfish (Clarias gariepinus) Juveniles
Authors: Oghale O.O. , Okoboshi A.C. , Chinedu-Ndukwe A.P. , Kanu K.C. , Beka M. , Avoaja D.A. 
Published: November 2021

The present study was designed to investigate acute toxicity of dimethoate on juvenile Clarias gariepinus. Catfish with mean weight and length of 24.01 ± 11.60 g and 13.98 ± 5.66 cm respectively were exposed to sub-lethal levels of dimethoate in static bioassay system for 28 days and mortality data was statistically evaluated using Finney’s Probit analysis. The 96-hour LC50 value for C. gariepinus was estimated as 29.05 mg/l. The value for the LC50 was used in deducing the sub-lethal concentrations (0.01, 0.15and 0.29 mg/l). Biochemical changes in the serum such as glycogen, total protein, cholesterol, urea and creatinine were analyzed after the exposure period (28 days). The glycogenlevel decreased in all sublethal exposures. An increase in cholesterol at lower exposure concentration, followed by slight increase in urea and creatinine among treated groups was recorded. Behavioural changes which includes changes in skin colour, jerking, restlessness, erratic swimming, among others were observed. Based on the result of this study, it was concluded that C. gariepinus juveniles are very sensitive to low concentration of dimethoate. Dimethoate is highly toxic to juvenile catfishes and as such measures must be taken to avoid its run-off into our aquatic environment thus jeopardizing the recruitment of juvenile catfishes into the fishery.
Follicle-stimulating hormone (FSH) receptor gene polymorphisms in Iraqi patients with non-obstructive azoospermia
Authors: Ali Abdul-Rahim , Abdul-Rasheed Omar , Alkawaz Ula 
Published: November 2021

Background: Follicle-stimulating hormone (FSH) is a pivotal hormone for male fertility, and its action on gonads is exerted by FSH receptors (FSHRs).
Objectives: To examine whether the presence of FSHR gene single nucleotide polymorphisms (SNPs), G919A and A2039G, involved in non-obstructive azoospermia (NOA) in Iraqi infertile men.
Methods: Two common SNPs, A919G and A2039G, in the FSHR gene were analyzed in 104 subjects (70 infertile patients with NOO: 33 NOA patients were not receiving treatment and 37 were on infertility treatment, and 34 normozoospermic fertile men as controls).
Results: The results revealed that the homozygous wild genotype (AA) of rs6165 FSHR gene SNP was more abundant than (AG) and (GG) genotypes in both groups of infertile NOA patients with a frequency of 49% in those who untreated, 81% in patients undergoing treatment and in the control group 41%. Whereas, the highest percentage of heterozygous genotype (AG) in the fertile control group was 41% when compared to NOApatients with a genotype frequency of 24% (for those who untreated) and 11% (for patients on treatment), respectively; with (A) allele frequency of 86% and the observed frequency of (G) allele was only 14% in the patients’ group as compared to that of controls that were (65 %) and (35 %), respectively. The rs6166 genotyping revealed that the homozygous wild genotype (GG) of FSHR gene was more abundant than (AG) and (AA) genotypes in NOA patients receiving infertility treatment with a frequency of (68%), in NOA patients who didn’t receive treatment 49%, while the lowest frequency was detected in the healthy fertile control group (47%).
Conclusions: These results support the evidence that rs6165 and rs6166, FSHR SNPs, might be involved in the pathogenesis and protection against NOA, respectively.