bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS KESESUAIAN LAHAN UNTUK PENGEMBANGAN EKOWISATA MANGROVE KURI CADDI KABUPATEN MAROS SULAWESI SELATAN
Authors: Rajab Muhammad Arhan , Nuryadin Rusmin
Published: December 2021

Dalam pengembangan kawasan ekowisata mangrove memerlukan sebuah kajian terkait aspek ekologi yang berkaitan dengan analisis kesesuaian lahan. Dengan kesesuaian lahan ini dapat dijadikan sebagai landasan apakah suatau wilayah layak atau tiak untuk dijadikan sebagai kawasan ekowisata. Penelitian ini bertujuan untuk menghitung indeks kesesuaian kawasan untuk pengembangan ekowisata  mangrove. Metode yang digunakan adalah metode survey yaitu melakukan pengamatan langsung terhadap kondisi biofisik mangrove.  Berdasarkan hasil penelitian potensi biofisik ekowisata mangrove yang ada di Kuri Caddi pada stasiun I termasuk dalam kategori S2 yaitu sesuai dengan presentase 77%, stasiun II dan III termasuk dalam kategori S1 yaitu sangat sesuai dengan presentase 86%. Dengan demikian disimpulkan bahwa potensi biofisik dari ekosistem mangrove sudah layak dan mendukung untuk dilakukan kegiatan ekowisata mangrove di Dusun Kuri Caddi Kabupaten Maros.
UPAYA MENINGKATKAN SOLIDARITAS DAN POLA HIDUP SEHAT PADA MASA PANDEMI COVID-19 DI DESA PASIR PINANG KECAMATAN PORTIBI
Authors: Jaya Farida , Nasution Fera Siska , Hasibuan Kiki Rimayanti , Siregar Lanina , Siregar Rismawati , Rambe Trinaningsih
Published: December 2021

Perbedaan silih pendapat sering terjadi di masyarakat, termasuk masyarakat Desa Pasir Pinang. Atas dasar ini, mahasiswa KKN DR 62 UIN SU Medan memandang penting mengupayakan peningkatan solidaritas dan juga pola hidup bersih di era pandemi Covid-19. Penelitian ini bertujuan untuk menganalisa upaya meningkatkan solidaritas dan pola hidup masyarakat pada masa pandemi Covid-19 di Desa Pasir Pinang. Penelitian ini menggunakan pendekatan kualitatif dengan metode deskriptif. Proses pengumpulan data dilakukan dengan menggunakan teknik sosialisasi, wawancara, observasi serta dokumentasi. Selanjutnya, data dianalisa dengan teknik reduksi data, penyajian data dan verifikasi. Hasil dari kegiatan atau program yang telah dilaksanakan oleh mahasiswa dapat meningkatkan solidaritas antarmasyarakat di Desa Pasir Pinang, meliputi kegiatan gotong royong, membantu bidan desa dalam pelaksanaan imunisasi bayi, membantu anak SD dan PIAUD untuk belajar bersama, dan kegiatan wirid yasin tiap minggunya. Selain itu, kegiatan yang diprogramkan juga membantu sosialisasi pola hidup sehat pada masyarakat, seperti lari pagi, membagikan masker, melakukan penghijauan taman, dan membersihkan balai desa. Dengan demikian, diharapkan masyarakat menyadari pentingnya solidaritas antar sesama dan menjaga kesehatan mental dan fisik dengan menerapkan pola hidup sehat selama masa pandemi Covid-19.
KEBIJAKAN SISTEM RESI GUDANG DALAM PENINGKATAN PENGEMBANGAN AGRIBISNIS: TINJAUAN SECARA KONSEP, MAKSUD, TUJUAN, FUNGSI DAN MANFAATNYA
Authors: Sulistyaningsih Sulistyaningsih
Published: December 2021

Pertanian merupakan sektor sangat strategis dalam pengembangan agribismis di Indonesia, terdapat beberapa kendala umum permasalahan agribisnis di Indonesia terutama yang dialami petani kecil, yaitu terkait dengan pembiayaan, pemasaran, ketersediaan infrastruktur, serta intensif bagi peningkatan produksi. Fakta membuktikan, saat panen raya petani selalu dihadapkan pada turunnya harga sampai pada tingkat yang tidak menguntungkan di pasar. Tujuan dari kajian ini adalah melakukan Tinjauan secara Konsep, Maksud, Tujuan, Fungsi dan Manfaat Sistem Resi Gudang agar kebijakan ini lebih termanfaatkan oleh petani. Metode yang digunakan kajian deskriptif tentang Sistem Resi Gudang, data sekunder dengan kajian pustaka dan artikel jurnal. Hasil kajian ini kedepan digunakan untuk memperoleh rumusan keberhasilan (key success factor), dalam rangka peningkatan pemanfaatan SRG agar dapat diimplementasikan dalam skala yang lebih luas, serta menjadi referensi dalam menerapkan kebijakan SRG.
Using Communication Boundaries to Minimize Athlete Social Media Distractions During Events
Authors: Hayes Michelle , Filo Kevin , Riot Caroline , Geurin Andrea N.
Published: December 2021

Sport organizations regulate athletes' use of social media for many reasons including the protection of the organization's reputation. Several strategies have been introduced to minimize issues related to the negative consequences athlete social media use may present, yet whether these
strategies also work to address social media distractions experienced by athletes during major sport events is not well known. Utilizing communication privacy management (CPM) theory, the purpose of the current research was to examine the aspects of social media that sport administrators perceive
to be distracting to athletes and what support and management mechanisms are utilized to address such concerns during major sport events. Semistructured interviews ( N = 7) with Australian national sport organization (NSO) administrators were conducted. Sport administrators reported
several aspects of social media that are perceived to distract athletes including personal and performance criticism and a fixation with social media profiles. Social media could also be used to manage athlete temperament. As a result, organizations highlighted both proactive and reactive
communication boundaries and mechanisms that could be used to address concerns including content restrictions, best practice case studies, engaging in conversations, and monitoring. Opportunities for sport practitioners are described including conducting consultation sessions with athletes
to better understand their needs regarding their social media use.
INDIGENOUS SOCIETIES AND THE URBAN SPACE OF SURGUT: EXPERIENCE OF INTERACTION
Authors:   Surgut State Pedagogical University, Medvedev V.V.
Published: December 2021

The article presents the study of the interaction of indigenous society’s representatives and the urban space on the example of the city of Surgut, Khanty-Mansi Autonomous District - Yugra. The purpose of the article is to determine the ways and practices of indigenous societies’ identity demonstration and ethnicity markers in the urban space. Methodological rationale is represented by the provisions of the hermeneutical approach as a practice of interpreting and constructing processes. The analyzed theoretical and empirical material allows a complex study of the research actors.
DEVELOPING THE PROJECT COMPETENCE OF FUTURE EDUCATORS IN THE SYSTEM OF UNIVERSITY EDUCATION
Authors:   Shukshin Altai State University for Humanities and Pedagogy, Novolodskaya E.G. , Manuzina E.B. ,   Shukshin Altai State University for Humanities and Pedagogy
Published: December 2021

The article considers the development of the project competence of future teachers during the university studies. The authors describe the theoretical and practical blocks of the module “Project Competence of a Teacher” in the course “Pedagogy”, and the students’ mastery of the project activity logics. A set of tasks for students to perform their own pedagogical design is presented.
STUDYING CHINESE CULTURE IN THE PRACTICE OF TEACHING RUSSIAN AS A FOREIGN LANGUAGE
Authors:   Renmin university, Pak I.Ya. , Ma L. ,   Tianjin normal university
Published: December 2021

The paper defines the role of Chinese culture in the process of teaching Russian as a foreign language on the example of Chinese universities. Textbooks on the course “Chinese Culture” are presented, as well as some authentic video materials about China. Step-by-step work with the plots of the television program “I want to know” (Channel One) is described. The conclusion is made about the possibility of using such videos as educational material in RFL classes. The obtained results showed that the Chinese cultural component should be taken into account when developing courses for Russian language faculties at Chinese universities.
APPROACHES TO THE CONSTRUCTION OF A Blended LEARNING MODELOF METHODS OF TEACHING PHYSICS
Authors:   Altai State Pedagogical University, Shapovalov A.A.
Published: December 2021

Based on the generalization of the previously made reviews of the concept of blended learning technology, its essential features are identified and clarified. The models of blended learning are proposed: idealized, non-digital, implemented in an online format, and real, focused on given conditions and a given time. The author describes the experience of selecting and accumulating traditional and digital didactic materials for the subsequent construction of the proposed models. The conclusion is made about the priorities of using such models in the course of methods of teaching physics.
CONFLICTS IN THE PROCESS OF ADAPTATION AMONG FRESHMEN IN HIGHER EDUCATIONAL INSTITUTIONS
Authors:   Synergy University, Baynova M.S. , Sulyagina Ju.O. ,   Russian State Social University, Rudakovskaya M.G. ,   Russian State Social University
Published: December 2021

The purpose of the study is to identify the level of conflict during the adaptation period and to determine possible factors of increased conflict among first-year undergraduate students. For two years, the authors conducted a survey in Moscow universities. Adaptation for students is related to an increase in anxiety, changes in responsibility for their actions. With the online start of the first year freshmen studied in their familiar environment, thus the adaptation process smoothed out, the conflict level decreased. The relevance of conflict prevention during the adaptation period becomes important when introducing a change in specialty after the second year and working out individual learning paths.
OVERVIEW OF ACTIVITIES OF PRIMORSKY REGIONAL LABOR EXCHANGE FOR 1918
Authors:   Far Eastern Federal University, Belevschuk G.P.
Published: December 2021

The article is devoted to the activities of Primorsky Regional Labor Exchange - an institution responsible for combating unemployment. The history of functioning of Labor Exchange in Primorsky region underwent several stages. The first stage is related to the activities of Provisional Government. The next one is the Soviet period, characterized by organizational work to establish a system of registration of the unemployed and the formation of the stock exchange committee. The third stage was the rule of non-Bolshevik governments, when there was an attempt to conduct statistical records of workers, enterprises and institutions in the region, as well as to find out the norms of remuneration.
REORGANIZATION OF SUPERVISING ACTIVITIES IN ALTAI DISTRICTIN 1917 - THE FIRST HALF OF 1918
Authors:   Altai State Pedagogical University, Afanasjev P.A. , Kalashnikov A.A. ,   Sigma Lyceum
Published: December 2021

The article considers the transformation of supervising institutions at the district and basic levels of Altai district in the context of revolutionary changes. The collapse of district supervision in 1917 caused the predominance of spontaneous control by the basic revolutionary authorities. The elimination of the general district control and the reorganization of the economic management in Altai from the beginning of 1918 transferred the audit activity to the audit commissions formed at the local level. The conditions of their creation, the peculiarities of their composition and activities ensured the functioning of the forestries of the former Altai District under the auspices of the new Soviet structures, preventing the final collapse of the district economy and being a democratic response to the pre-revolutionary district control system.
STRENGTHENING OF RUSSIA’S POSITION IN THE SOUTHERN CASPII IN THE 1840S IN THE CONTEXT OF RUSSIAN-IRANIAN RELATIONS
Authors:   Institute of World History of the Russian Academy of Sciences, Larin A.B.
Published: December 2021

The article is devoted to the policy of Russia in the south of the Caspian Sea in the 1840s. It is shown that due to the use of the advantages provided by the Turkmanchay Treaty of 1828, the Russian Empire managed to significantly strengthen its position in the region: it expanded its naval presence, achieved significant success in combating piracy and stabilizing the region, and created conditions for the development of trade. Special attention is paid to the establishment of steamship communication in the Caspian Sea.
El divino sordo
Authors: Martínez Pérez José Antonio
Published: December 2021

Ludwig van Beethoven, uno de los más grandes compositores de todos los tiempos, marcó un antes y un después en el arte de la música   considerándosele  como  la figura central de la  transición entre el clasicismo musical del siglo XVIII y el romanticismo del siglo XIX. Su sordera todavía se mueve en el terreno de las hipótesis y sigue siendo materia de debate.
Utilidad de la gammagrafía de captación tiroidea en enfermedad tiroidea no maligna.
Authors: Mola Reyes Laura
Published: December 2021

Introducción: La gammagrafía tiroidea es una prueba ampliamente utilizada para evaluar la estructura y el funcionamiento de la glándula tiroides.Objetivo: Evaluar la utilidad de la gammagrafía de captación tiroidea en las consultas de Endocrinología y Nutrición del Hospital Central de la Defensa Gómez Ulla.Materiales y métodos: Observacional retrospectivo. Se incluyeron las exploraciones de captación tiroidea realizadas durante el período de un año, de enero a diciembre de 2019, en el Hospital Central de la Defensa Gómez Ulla de Madrid. Se recogieron datos epidemiológicos de las historias clínicas sobre función tiroidea, anticuerpos contra el receptor de TSH (TSI), diagnóstico final y manejo del paciente.  Análisis con Stata versión 16: Frecuencia absoluta y relativa, y prueba de Chi-cuadrado. 

Resultados: Obtuvimos un total de 91 pacientes que tenían exploración con gammagrafía tiroidea. La gran mayoría mujeres (71%) versus 29% de los pacientes varones. La media de edad: 63 (SD 17.99) años.El 79% de los pacientes tenían TSH suprimida. Y la mayoría de los pacientes que fueron derivados para exploración gammagráfica tenían hipertiroidismo subclínico: 34 (37%), seguidos de enfermedad de Graves (EG): 22 (24%) e hipertiroidismo primario con autoinmunidad negativa: 9 (10%).Con respecto a los hallazgos gammagráficos, el 43% de los pacientes tenían un bocio tóxico difuso por EG; 25% glándula tiroidea normal; 13% adenomas tóxicos; 9% nódulo frío; 4% ausencia de captación del radiotrazador en el parénquima tiroideo, hallazgos que podrían estar relacionados con un bloqueo tiroideo secundario al tratamiento con amiodarona, administración reciente de contraste yodado, tiroiditis subaguda; y el resto tenía otros diagnósticos, bocio multinodular (3%), bocio nodular con tendencia autonómica (3%).El 70% de los pacientes tenían TSI negativos vs 28% con TSI positivos, en el 2% restante no disponíamos de este dato. En aquellos con TSI positivo, la gammagrafía no agregó información significativa para esclarecer el diagnóstico o manejo. Sin embargo, en los que los TSI resultaron negativos, la prueba de captación tiroidea modificó el diagnóstico inicial en un 70% aunque la diferencia no fue estadísticamente significativa ( P=0.199)Conclusiones:

La indicación clínica más común de la gammagrafía en nuestro ambiente es para evaluar el hipertiroidismo subclínico. Nuestros resultados muestran que la gammagrafía de captación tiroidea puede ser útil en pacientes con hipertiroidismo con TSI negativos. Los médicos deben evaluar cada caso de forma individual para determinar si la exploración de captación alterará significativamente el diagnóstico o el tratamiento del paciente.
Daza, Miguel (2019), Corónica de don Mexiano de la Esperança, Caballero de la fe, Ana Martínez Muñoz (ed.). Alcalá de Henares: Servicio de Publicaciones de la Universidad de Alcalá
Authors: Izquierdo Andreu Almudena
Published: December 2021

Reseña de la edición crítica de: Daza, Miguel (2019), Corónica de don Mexiano de la Esperança, Caballero de la fe. Ana Martínez Muñoz (ed.). Alcalá de Henares: Servicio de Publicaciones de la Universidad de Alcalá.
GÖÇ VE GÖÇMENLERİN EĞİTİMİ İLE İLGİLİ TÜRKİYE’DEKİ DOKTORA TEZLERİNİN İNCELENMESİ: BİR İÇERİK ANALİZİ ÇALIŞMASI
Authors: BOZKAYA Hasan
Published: December 2021

Bu çalışma, 2011-2020 yılları arasında Türkiye’de göç ve göçmenler ile ilgili yazılan doktora tezlerinin içerik analizini yaparak, bu tezlerde göçmenlerin eğitimi ile ilgili durumu değerlendirmek amacıyla gerçekleştirilmiştir. Çalışma verileri Ulusal Tez Merkezi’nden ve erişimi serbest olan toplam 62 doktora tezinin verilerine dayanılarak elde edilmiştir. İncelenen doktora tezlerinin; yayınlandığı yıl, üniversitesi, enstitüsü, anabilim dalları, konu alanları, araştırma desenleri, örneklem büyüklükleri, veri toplama tekniği ve araçları yönünden incelenmiştir. Araştırmada, tarama yöntemi kullanılarak içerik analizi yapılmış ve elde edilen bulguların yüzdeleri ile frekansları tablolar ve grafikler yardımıyla sunulmuştur. Analiz sonuçlarına göre göç ile ilgili en çok doktora tezinin 2019-2020 döneminde yazıldığı görülmüştür. Yazılan doktora tezlerinin en çok İstanbul ve Ankara üniversitelerinde, sosyal bilimler enstitüsünde, sosyoloji anabilim dalında ve sosyoloji alanında çalışmaların yapıldığı tespit edilmiştir. Ayrıca araştırma yöntemi olarak en çok nitel araştırma deseninin kullanıldığı görülmüştür. Veri toplama tekniği ve verilerin analizinde ise araştırma yöntemi olarak en çok kullanılan nitel araştırma desenine uygun olan görüşme ve doküman analizi tekniği kullanılmıştır. Konu bakımından ise incelenen tezler içerisinde sadece üç tanesinin göçmenlerin eğitimi ile ilgili olduğu ve göçmenlerin eğitimi ile ilgili yazılan tez sayısının yetersiz olduğu sonucuna varılmıştır.
Acupuncture for adenomyosis: a systematic review and meta-analysis
Authors:   The Chinese University of Hong Kong, Lin Shike , Tan Bing , Sooranna Suren Rao , Getaneh Tlaye Kenean , Li Meiyan , Zhao Chaoting , Xiong Xi , Wang Xiong , Zhang Tao , Wang Chi Chiu
Published: December 2021

Review question / Objective: Can patients with adenomyosis benefit from acupuncture treatments? Evaluation of current evidence with respect to the efficacy and safety of acupuncture for adenomyosis by conducting a systematic review and meta-analysis of the available randomized controlled trial. Condition being studied: Adenomyosis is a gynecological disorder defined as the presence of the endometrial gland and stroma cells within the myometrium. This condition mainly occurs in women who are multiparous and over the age of 30. Among women undergoing hysterectomy, the frequency of adenomyosis is reported to range from 8.8% to 61.5%. Adenomyosis is also observed in 20. 9% to 34% of women who have been referred for pelvic imaging. The incidence of adenomyosis in the general population remains uncertain. Adenomyosis can significantly decrease the patient’s quality of life, with the clinical presentations of menorrhagia, dysmenorrhea, metrorrhagia, chronic pelvic pain and dyspareunia.
Aplicação da teoria da perda de uma chance no âmbito do seguro E&O de advogados
Authors: Junqueira Thiago
Published: December 2021

O presente artigo tem como escopo examinar a aplicação da teoria da perda de uma chance no âmbito do seguro de responsabilidade civil profissional do advogado. Além de enfrentar os principais pontos na matéria, pretende-se tirar da sombra os critérios que deverão conduzir o processo de quantificação do dano ressarcível ao terceiro lesado, usualmente feito em sede de regulação de sinistro pelo segurador.
Thought fragments of Preliminary Session in Relation to Accusation and Evidentiary Procedure
Authors: Horgos Lívia
Published: December 2021

The present study focuses on preliminary session, which was altered in its function by the resolutions of the new Law of Criminal Procedure (entering into force in 2018), that is Act XC of 2017 (henceforth LCP) with special regard to the relationship between accusation and evidentiary procedure with the help of a case. I also examine the rules of criminal procedure codified in Hungarian judicature, the function and influence of preliminary session, the main characteristics and the place of preliminary session among procedural forms of court procedures. The study examines whether preliminary session regulated by LCP meets the requirements and checks indictment eliminating unsubstantiated procedures. In case it fails to do so, what further regulations are needed to be added to present ones in order to meet requirements with special regard to codification policy embodied in criminal judicature, especially effectiveness, promptness, simplicity and coherence. I examine in details the possibility whether it could be the right and obligation of the court to examine not only the means of evidence deriving from legal elements and other informative elements contained in the presented indictment but also the legality of preliminary sessions and investigation procedures as a legal condition of initiating a court procedure. The study describes the regulation of LCP concerning evidentiary procedures in the preliminary session emphasizing the modifications by Act XLIII of 2020 concerning the interrogation of the accused. I examine its significance and point out whether anomalies in connection with the limits of evidentiary procedure are successfully eliminated in judicature.
A Novel Method for Estimating the Ambient Medium Density Around Distant Radio Sources from Their Observed Radio Spectra
Authors: Wójtowicz Anna , Stawarz Łukasz , Machalski Jerzy , Ostorero Luisa
Published: December 2021

The dynamical evolution and radiative properties of luminous radio galaxies and quasars of the FR II type, are well understood. As a result, through the use of detailed modeling of the observed radio emission of such sources, one can estimate various physical parameters of the systems, including the density of the ambient medium into which the radio structure evolves. This, however, requires rather comprehensive observational information, i.e., sampling the broadband radio continua of the targets at several frequencies, and imaging their radio structures with high resolution. Such observations are, on the other hand, not always available, especially for high-redshift objects. Here, we analyze the best-fit values of the source physical parameters, derived from extensive modeling of the largest currently available sample of FR II radio sources, for which good-quality multiwavelength radio flux measurements could be collected. In the analyzed data set, we notice a significant and nonobvious correlation between the spectral index of the nonthermal radio emission continuum, and density of the ambient medium. We derive the corresponding correlation parameters, and quantify the intrinsic scatter by means of Bayesian analysis. We propose that the discovered correlation could be used as a cosmological tool to estimate the density of ambient medium for large samples of distant radio galaxies. Our method does not require any detailed modeling of individual sources, and relies on limited observational information, namely, the slope of the radio continuum between the rest-frame frequencies 0.4 and 5 GHz, possibly combined with the total linear size of the radio structure.
Is There Any Linkage between Interstellar Aldehyde and Alcohol?
Authors: Mondal Suman Kumar , Gorai Prasanta , Sil Milan , Ghosh Rana , Etim Emmanuel E. , Chakrabarti Sandip K. , Shimonishi Takashi , Nakatani Naoki , Furuya Kenji , Tan Jonathan C. , Das Ankan
Published: December 2021

It is speculated that there might be some linkage between interstellar aldehydes and their corresponding alcohols. Here an observational study and astrochemical modeling are coupled together to illustrate the connection between them. The ALMA cycle 4 data of a hot molecular core, G10.47+0.03, are utilized for this study. Various aldehydes (acetaldehyde, propanal, and glycolaldehyde), alcohols (methanol and ethylene glycol), and a ketone (acetone) are identified in this source. The excitation temperatures and column densities of these species were derived via the rotation diagram method assuming local thermodynamic equilibrium conditions. An extensive investigation is carried out to understand the formation of these species. Six pairs of aldehyde–alcohol are considered for this study: (i) methanal and methanol, (ii) ethanal and ethanol, (iii) propanal and 1-propanol, (iv) propenal and allyl alcohol, (v) propynal and propargyl alcohol, and (vi) glycolaldehyde and ethylene glycol. One pair of ketone–alcohol (acetone and isopropanol) and ketene–alcohol (ethenone and vinyl alcohol) are also considered. Two successive hydrogenation reactions in the ice phase are examined to form these alcohols from aldehydes, ketone, and ketene, respectively. Quantum chemical methods are extensively executed to review the ice-phase formation route and the kinetics of these species. Based on the obtained kinetic data, astrochemical modeling is employed to derive the abundances of these aldehydes, alcohols, ketone, and ketene in this source. It is seen that our model could successfully explain the observed abundances of various species in this hot molecular core.
The Four Cosmic Tidal Web Elements from the β-skeleton
Authors: Suárez-Pérez John F. , Camargo Yeimy , Li Xiao-Dong , Forero-Romero Jaime E.
Published: December 2021

Precise cosmic web classification of observed galaxies in massive spectroscopic surveys can be either highly uncertain or computationally expensive. As an alternative, we explore a fast Machine Learning-based approach to infer the underlying dark matter tidal cosmic web environment of a galaxy distribution from its β-skeleton graph. We develop and test our methodology using the cosmological magnetohydrodynamic simulation Illustris-TNG at z = 0. We explore three different tree-based machine-learning algorithms to find that a random forest classifier can best use graph-based features to classify a galaxy as belonging to a peak, filament, or sheet as defined by the T-Web classification algorithm. The best match between the galaxies and the dark matter T-Web corresponds to a density field smoothed over scales of 2 Mpc, a threshold over the eigenvalues of the dimensionless tidal tensor of λ
th = 0.0, and galaxy number densities around 8 × 10−3 Mpc−3. This methodology results on a weighted F1 score of 0.728 and a global accuracy of 74%. More extensive tests that take into account light-cone effects and redshift space distortions are left for future work. We make one of our highest ranking random forest models available on a public repository for future reference and reuse.
Simulations of Helical Inflationary Magnetogenesis and Gravitational Waves
Authors: Brandenburg Axel , He Yutong , Sharma Ramkishor
Published: December 2021

Using numerical simulations of helical inflationary magnetogenesis in a low reheating temperature scenario, we show that the magnetic energy spectrum is strongly peaked at a particular wavenumber that depends on the reheating temperature. Gravitational waves (GWs) are produced at frequencies between 3 nHz and 50 mHz for reheating temperatures between 150 MeV and 3 × 105 GeV, respectively. At and below the peak frequency, the stress spectrum is always found to be that of white noise. This implies a linear increase of GW energy per logarithmic wavenumber interval, instead of a cubic one. Both in the helical and nonhelical cases, the GW spectrum is followed by a sharp drop for frequencies above the respective peak frequency. In this magnetogenesis scenario, the presence of a helical term extends the peak of the GW spectrum and therefore also the position of the aforementioned drop toward larger frequencies compared to the case without helicity. This might make a difference in it being detectable with space interferometers. The efficiency of GW production is found to be almost the same as in the nonhelical case, and independent of the reheating temperature, provided the electromagnetic energy at the end of reheating is fixed to be a certain fraction of the radiation energy density. Also, contrary to the case without helicity, the electric energy is now less than the magnetic energy during reheating. The fractional circular polarization is found to be nearly 100% in a certain range below the peak frequency range.
Feedback from γ Cassiopeiae: Large Expanding Cavity, Accelerating Cometary Globules, and Peculiar X-Ray Emission
Authors: Chen Xuepeng , Guo Weihua , Sun Li , Feng Jiangchen , Su Yang , Sun Yan , Zhang Shaobo , Zhou Xin , Yan Qing-Zeng , Fang Min , Yang Ji
Published: December 2021

We present wide-field multiwavelength observations of γ Cassiopeiae (or γ Cas for short) in order to study its feedback toward the interstellar environment. A large expanding cavity is discovered toward γ Cas in the neutral hydrogen (H i) images at a systemic velocity of about −10 km s−1. The measured dimension of the cavity is roughly 2.°0 × 1.°4 (or 6.0 pc × 4.2 pc at a distance of 168 pc), while the expansion velocity is ∼5.0 ± 0.5 km s−1. The CO observations reveal systematic velocity gradients in IC 63 (∼20 km s−1 pc−1) and IC 59 (∼30 km s−1 pc−1), two cometary globules illuminated by γ Cas, proving fast acceleration of the globules under stellar radiation pressure. The gas kinematics indicate that the cavity is opened by strong stellar wind, which has high potential to lead to the peculiar X-ray emission observed in γ Cas. Our result favors a new scenario that emphasizes the roles of stellar wind and binarity in the X-ray emission of the γ Cas stars.
Measuring an Off-center Detonation through Infrared Line Profiles: The Peculiar Type Ia Supernova SN 2020qxp/ASASSN-20jq
Authors: Hoeflich P. , Ashall C. , Bose S. , Baron E. , Stritzinger M. D. , Davis S. , Shahbandeh M. , Anand G. S. , Baade D. , Burns C. R. , Collins D. C. , Diamond T. R. , Fisher A. , Galbany L. , Hristov B. A. , Hsiao E. Y. , Phillips M. M. , Shappee B. , Suntzeff N. B. , Tucker M.
Published: December 2021

We present and analyze a near-infrared (NIR) spectrum of the underluminous Type Ia supernova SN 2020qxp/ASASSN-20jq obtained with NIRES at the Keck Observatory, 191 days after B-band maximum. The spectrum is dominated by a number of broad emission features, including the [Fe ii] at 1.644 μm, which is highly asymmetric with a tilted top and a peak redshifted by ≈2000 km s−1. In comparison with 2D non-LTE synthetic spectra computed from 3D simulations of off-center delayed-detonation Chandrasekhar-mass (M
ch) white dwarf (WD) models, we find good agreement between the observed lines and the synthetic profiles, and are able to unravel the structure of the progenitor’s envelope. We find that the size and tilt of the [Fe ii] 1.644 μm profile (in velocity space) is an effective way to determine the location of an off-center delayed-detonation transition (DDT) and the viewing angle, and it requires a WD with a high central density of ∼4 × 109 g cm−3. We also tentatively identify a stable Ni feature around 1.9 μm characterized by a “pot-belly” profile that is slightly offset with respect to the kinematic center. In the case of SN 2020qxp/ASASSN-20jq, we estimate that the location of the DDT is ∼0.3M
WD off center, which gives rise to an asymmetric distribution of the underlying ejecta. We also demonstrate that low-luminosity and high-density WD SN Ia progenitors exhibit a very strong overlap of Ca and 56Ni in physical space. This results in the formation of a prevalent [Ca ii] 0.73 μm emission feature that is sensitive to asymmetry effects. Our findings are discussed within the context of alternative scenarios, including off-center C/O detonations in He-triggered sub-M
Ch WDs and the direct collision of two WDs. Snapshot programs with Gemini/Keck/Very Large Telescope (VLT)/ELT-class instruments and our spectropolarimetry program are complementary to mid-IR spectra by the James Webb Space Telescope (JWST).
Search for Continuous Gravitational-wave Signals in Pulsar Timing Residuals: A New Scalable Approach with Diffusive Nested Sampling
Authors: Songsheng Yu-Yang , Qian Yi-Qian , Li Yan-Rong , Du Pu , Chen Jie-Wen , Wang Yan , Mohanty Soumya D. , Wang Jian-Min
Published: December 2021

Detecting continuous nanohertz gravitational waves (GWs) generated by individual close binaries of supermassive black holes (CB-SMBHs) is one of the primary objectives of pulsar timing arrays (PTAs). The detection sensitivity is slated to increase significantly as the number of well-timed millisecond pulsars will increase by more than an order of magnitude with the advent of next-generation radio telescopes. Currently, the Bayesian analysis pipeline using parallel tempering Markov Chain Monte Carlo has been applied in multiple studies for CB-SMBH searches, but it may be challenged by the high dimensionality of the parameter space for future large-scale PTAs. One solution is to reduce the dimensionality by maximizing or marginalizing over uninformative parameters semianalytically, but it is not clear whether this approach can be extended to more complex signal models without making overly simplified assumptions. Recently, the method of diffusive nested (DNest) sampling has shown capability in coping with high dimensionality and multimodality effectively in Bayesian analysis. In this paper, we apply DNest to search for continuous GWs in simulated pulsar timing residuals and find that it performs well in terms of accuracy, robustness, and efficiency for a PTA including



(

10

2

)

pulsars. DNest also allows a simultaneous search of multiple sources elegantly, which demonstrates its scalability and general applicability. Our results show that it is convenient and also highly beneficial to include DNest in current toolboxes of PTA analysis.
On the Turbulent Reduction of Drifts for Solar Energetic Particles
Authors: van den Berg J. P. , Engelbrecht N. E. , Wijsen N. , Strauss R. D.
Published: December 2021

Particle drifts perpendicular to the background magnetic field have been proposed by some authors as an explanation for the very efficient perpendicular transport of solar energetic particles (SEPs). This process, however, competes with perpendicular diffusion caused by magnetic turbulence, which can also disrupt the drift patterns and reduce the magnitude of drift effects. The latter phenomenon is well known in cosmic-ray studies, but not yet considered in SEP models. Additionally, SEP models that do not include drifts, especially for electrons, use turbulent drift reduction as a justification of this omission, without critically evaluating or testing this assumption. This article presents the first theoretical step for a theory of drift suppression in SEP transport. This is done by deriving the turbulence-dependent drift reduction function with a pitch-angle dependence, as is applicable for anisotropic particle distributions, and by investigating to what extent drifts will be reduced in the inner heliosphere for realistic turbulence conditions and different pitch-angle dependencies of the perpendicular diffusion coefficient. The influence of the derived turbulent drift reduction factors on the transport of SEPs are tested, using a state-of-the-art SEP transport code, for several expressions of theoretically derived perpendicular diffusion coefficients. It is found, for realistic turbulence conditions in the inner heliosphere, that cross-field diffusion will have the largest influence on the perpendicular transport of SEPs, as opposed to particle drifts.
The Flattening Metallicity Gradient in the Milky Way’s Thin Disk
Authors: Vickers John J. , Shen Juntai , Li Zhao-Yu
Published: December 2021

We calculate the ages, orbits and phase-space coordinates for a sample of ∼4 million LAMOST and Gaia stars. The ages are cross-matched and compared with values from two other popular age catalogs, which derive the ages using different methods. Of these ∼4 million stars, we select a sample of 1.3 million stars and investigate their radial metallicity gradients (as determined by orbital radii) as a function of their ages. This analysis is performed on various subsets of the data split by chemistry and orbital parameters. We find that commonly used selections for “thin disk” stars (such as low-α chemistry or vertically thin orbits) yield radial metallicity gradients that generally grow shallower for the oldest stars. We interpret this as a hallmark feature of radial migration (churning). Constraining our sample to very small orbital Z
max (the maximal height of a star’s integrated orbit) makes this trend most pronounced. A chemistry-based “thin disk” selection of α-poor stars displays the same trend, but to a lesser extent. Intriguingly, we find that “thick disk” selections in chemistry and Z
max reveal slightly positive radial metallicity gradients, which seem similar in magnitude at all ages. This may imply that the thick disk population is well mixed in age, but not in radius. This finding could help constrain conditions during the early epochs of Milky Way formation and shed light on processes such as the accretion and reaccretion of gases of different metallicities.
MHD and Ion Kinetic Waves in Field-aligned Flows Observed by Parker Solar Probe
Authors: Zhao L.-L. , Zank G. P. , He J. S. , Telloni D. , Adhikari L. , Nakanotani M. , Kasper J. C. , Bale S. D.
Published: December 2021

Parker Solar Probe (PSP) observed predominately Alfvénic fluctuations in the solar wind near the Sun where the magnetic field tends to be radially aligned. In this paper, two magnetic-field-aligned solar wind flow intervals during PSP’s first two orbits are analyzed. Observations of these intervals indicate strong signatures of parallel/antiparallel-propagating waves. We utilize multiple analysis techniques to extract the properties of the observed waves in both magnetohydrodynamic (MHD) and kinetic scales. At the MHD scale, outward-propagating Alfvén waves dominate both intervals, and outward-propagating fast magnetosonic waves present the second-largest contribution in the spectral energy density. At kinetic scales, we identify the circularly polarized plasma waves propagating near the proton gyrofrequency in both intervals. However, the sense of magnetic polarization in the spacecraft frame is observed to be opposite in the two intervals, although they both possess a sunward background magnetic field. The ion-scale plasma wave observed in the first interval can be either an inward-propagating ion cyclotron wave (ICW) or an outward-propagating fast-mode/whistler wave in the plasma frame, while in the second interval it can be explained as an outward ICW or inward fast-mode/whistler wave. The identification of the exact kinetic wave mode is more difficult to confirm owing to the limited plasma data resolution. The presence of ion-scale waves near the Sun suggests that ion cyclotron resonance may be one of the ubiquitous kinetic physical processes associated with small-scale magnetic fluctuations and kinetic instabilities in the inner heliosphere.
Energetic Particle Acceleration in Compressible Magnetohydrodynamic Turbulence
Authors: Zhang Jian-Fu , Xiang Fu-Yuan
Published: December 2021

Magnetohydrodynamic (MHD) turbulence is an important agent of energetic particle acceleration. Focusing on the compressible properties of magnetic turbulence, we adopt the test particle method to study the particle acceleration from Alfvén, slow, and fast modes in four turbulence regimes that may appear in a realistic astrophysical environment. Our studies show that (1) the second-order Fermi mechanism drives the acceleration of particles in the cascade processes of three modes by particle-turbulence interactions, regardless of whether the shock wave appears; (2) not only can the power spectra of maximum-acceleration rates reveal the inertial range of compressible turbulence, but also recover the scaling and energy ratio relationship between the modes; (3) fast mode dominates the acceleration of particles, especially in the case of super-Alfvénic and supersonic turbulence, slow mode dominates the acceleration for sub-Alfvénic turbulence in the very-high-energy range, and the acceleration of Alfvén mode is significant at the early stage of the acceleration; (4) particle acceleration from three modes results in a power-law distribution in the certain range of evolution time. From the perspective of particle-wave mode interaction, this paper promotes the understanding for both the properties of turbulence and the behavior of particle acceleration, which will help provide insight into astrophysical processes involved in MHD turbulence.
Probing Gas Kinematics and PDR Structure around O-type Stars in the Sh 2-305 H ii Region
Authors: Bhadari N. K. , Dewangan L. K. , Zemlyanukha P. M. , Ojha D. K. , Zinchenko I. I. , Sharma Saurabh
Published: December 2021

We report an observational study of the Galactic H ii region Sh 2-305/S305 using the [C ii] 158 μm line data, which are used to examine the gas dynamics and structure of photodissociation regions. The integrated [C ii] emission map at [39.4, 49.5] km s−1 spatially traces two shell-like structures (i.e., inner and outer neutral shells) having a total mass of ∼565 M
⊙. The inner neutral shell encompasses an O9.5V star at its center and has a compact ring-like appearance. However, the outer shell is seen with more extended and diffuse [C ii] emission, hosting an O8.5V star at its center, and surrounds the inner neutral shell. The velocity channel maps and position–velocity diagrams confirm the presence of a compact [C ii] shell embedded in the diffuse outer shell, and both the shells seem to expand with

v

exp

∼
1.3

km s−1. The outer shell appears to be older than the inner shell, hinting that these shells are formed sequentially. The [C ii] profiles are examined toward S305, which are either double peaked or blue skewed and have the brighter redshifted component. The redshifted and blueshifted components spatially trace the inner and outer neutral shell geometry, respectively. The ionized, neutral, and molecular zones in S305 are seen adjacent to one another around the O-type stars. The regularly spaced dense molecular and dust clumps (mass ∼10–103
M
⊙) are investigated around the neutral shells, which might have originated as a result of gravitational instability in the shell of collected materials.
In Situ Formation of Super-Earth/Sub-Neptune Driven by the Planetary Rotation
Authors: Zhong Wei , Yu Cong
Published: December 2021

Kepler’s observation shows that many of the detected planets are super-Earths. They are inside a range of critical masses overlapping the core masses (2–20 M
⊕), which would trigger the runaway accretion and develop the gas giants. Thus, super-Earths/sub-Neptunes can be formed by restraining runaway growth of gaseous envelopes. We assess the effect of planetary rotation in delaying the mass growth. The centrifugal force, induced by spin, will offset a part of the gravitational force and deform the planet. Tracking the change in structure, we find that the temperature at the radiative–convective boundary (RCB) is approximate to the boundary temperature. Since rotation reduces the radiation energy densities in the convective and radiative layers, RCB will penetrate deeper. The cooling luminosity would decrease. Under this condition, the evolutionary timescale can exceed the disk lifetime (10 Myr), and a super-Earth/sub-Neptune could be formed after undergoing additional mass-loss processes. In the dusty atmosphere, even a lower angular velocity can also promote a super-Earth/sub-Neptune forming. Therefore, we conclude that rotation can slow down the planet’s cooling and then promote a super-Earth/sub-Neptune forming.
Asteroseismology of a High-amplitude δ Scuti Star GSC 4552-1498: Mode Identification and Model Fitting
Authors: Sun Xiao-Ya , Zuo Zhao-Yu , Yang Tao-Zhi , Chen Xing-Hao , Li Hong-Rong
Published: December 2021

In this paper, the pulsation behavior of high-amplitude δ Scuti star GSC 4552-1498 was analyzed. Using the high-precision photometric data from the Transiting Exoplanet Survey Satellite, two new independent frequencies F1 = 22.6424(1) day−1 and F2 = 28.6803(5) day−1 were identified for this source, along with the fundamental one F = 17.9176(7) day−1, which was previously known. In addition, the classical O − C analysis was conducted to give a new ephemeris formula of BJDmax = T
0 + P × E = 2453321.534716(4) + 0.055811(0) × E. The O − C diagram reveals a continuous period increase, but the rate of (1/P)(dP/dt) = 1.11(3) × 10−7 yr−1 seems much larger (about hundreds) than predicted by evolution theories, which is long been noticed but not well understood, possibly related to nonlinear mode interaction. Based on frequency parameters (i.e., F, F1, and F2), a series of theoretical models were conducted by employing the stellar evolution code. It turns out that F1 should be a non-radial mode and F2 is the second overtone radial mode. Due to the mass–metallicity degeneracy, the stellar parameter of the star can however not be determined conclusively. We suggest high-resolution spectral observation is highly desired in the future to further constrain models. We note GSC 4552-1498 is located on the main sequence in the H-R diagram.
Re-examination of the Time Structure of the SN1987A Neutrino Burst Data in Kamiokande-II
Authors: Oyama Yuichi
Published: December 2021

The seven seconds’ gap in the Kamiokande-II SN1987A neutrino data is reexamined.
A Morphological Classification of 18,190 Molecular Clouds Identified in 12CO Data from the MWISP Survey
Authors: Yuan Lixia , Yang Ji , Du Fujun , Liu Xunchuan , Zhang Shaobo , Lin Zehao , Sun Jingfei , Yan Qing-Zeng , Ma Yuehui , Su Yang , Sun Yan , Zhou Xin
Published: December 2021

We attempt to visually classify the morphologies of 18,190 molecular clouds, which are identified in the 12CO(1–0) spectral line data over ∼450 deg2 of the second Galactic quadrant from the Milky Way Imaging Scroll Painting project. Using the velocity-integrated intensity maps of the 12CO(1–0) emission, molecular clouds are first divided into unresolved and resolved ones. The resolved clouds are further classified as nonfilaments or filaments. Among the 18,190 molecular clouds, ∼25% are unresolved, ∼64% are nonfilaments, and ∼11% are filaments. In the terms of the integrated flux of 12CO(1–0) spectra of all 18,190 molecular clouds, ∼90% are from filaments, ∼9% are from nonfilaments, and the remaining ∼1% are from unresolved sources. Although nonfilaments are dominant in the number of the discrete molecular clouds, filaments are the main contributor of 12CO emission flux. We also present the number distributions of the physical parameters of the molecular clouds in our catalog, including their angular sizes, velocity spans, peak intensities of 12CO(1–0) emission, and 12CO(1–0) total fluxes. We find that there is a systematic difference between the angular sizes of the nonfilaments and filaments, with the filaments tending to have larger angular scales. The H2 column densities of them are not significantly different. We also discuss the observational effects, such as those induced by the finite spatial resolution, beam dilution, and line-of-sight projection, on the morphological classification of molecular clouds in our sample.