bluuebunny/crossref_metadata_2025 huggingface dataset:
Factors Affecting Talent Management Strategies in Construction Companies
Authors: Setyawan Agustinus , Nelson Alden
Published: April 2021

Business competition in construction companies is getting tighter and human resource management is one of the essential things in supporting the company’s competitiveness. The right strategy is needed if a company wants to build a strong team by forming highly talented people in a company. This study aims to analyze the influence of management commitment, organizational culture, reward system, career management, and knowledge management on talent management strategy. The method used in sample selection is a non-probability method with purposive sampling technique and the population is employees who work in the offshore construction industry in Batam. This study uses a questionnaire to frontline management employees of the offshore construction industry and the rate of return of the questionnaire is 50 sheets. The statistical method used to test the hypothesis is multiple regression using the SPSS program. The results of the research conducted indicate that the management commitment and knowledge management variables have a significant positive effect on the talent management strategy, while the organizational culture variables, reward systems, and career management do not have a significant positive effect on the talent management strategy.
The Influence of Celebrity Endorser on Purchase Intention with Perceived Quality as Mediating Variable
Authors: Kesturi Tharissa , Rubiyanti Rd. Nurafni
Published: April 2021

The cosmetics industry is projected to continue to experience growth by the Indonesian Cosmetics Companies Association by 15% to Rp. 11.22 trillion from Rp. 9.76 trillion in 2012. One of the cosmetic brands in Indonesia is Wardah Cosmetic. The purpose of this study was to determine the effect of celebrity endorsers and Wardah Cosmetic's perceived quality on the buying interest. The method used in this research is the quantitative method, with the type of descriptive-causal analysis. Sampling with a non-probability sampling method with purposive sampling type with a sample size of 100 female consumers in the city of Bandung. The data analysis technique used is descriptive analysis technique and Partial Least Square - Structural Equation Model analysis. Based on SEM-PLS analysis, the celebrity endorser variable has a strong effect on purchase intention with a T-Statistics value of 7.486. Based on the moderation effect analysis, perceived quality perfectly mediates with a T-Statistics value of 1.124. The conclusion of this study, the variable perceived quality effectively influences as a perfect mediator towards celebrity endorsers and buying interest, which means that Wardah Cosmetic's use of celebrity endorsers is appropriate to affect the perceived quality of Wardah Cosmetic products and stimulate consumer buying interest.
The Effect of Corporate Governance and Financial Performance on Dividend Policy
Authors: Yuniati Rochmah , Wijayanti Anita , Dewi Riana Rachmawati
Published: April 2021

This study aims to examine and analyze the effect of corporate governance and financial performance on dividend policies. The dependent variable is dividend policy and the independent variable is the size of the board of commissioners, independent board of commissioners, managerial ownership, liquidity and profitability. The population of this research is 14 Manufacturing companies listed on the Indonesia Stock Exchange in the period 2015 – 2018. With a total sample size of 56 and this sampling technique uses a purposive sampling method. Testing the hypothesis of this study using multiple linear regression test. The results of this study indicate that the size of the board of commissioners, the board of independent commissioners and profitability affect the dividend policy, managerial ownership and liquidity do not affect the dividend policy
Application of PSAK 109 In Organization of Zakat Managers (OPZ) In Sragen District (Baznas, Lazisnu, Lazismu, And Lazku)
Authors: Sari Jelita Mustika , Titisari Kartika Hendra , Nurlaela Siti
Published: April 2021

This study aims to determine and analyze how the application of zakat and infaq / alms accounting in zakat management organizations in Sragen regency. This type of research is qualitative research. The population and sample used are zakat management organizations in Sragen district, by taking a sample using purposive sampling technique and obtained 4 zakat management organizations with comparative descriptive analysis. The results of this study indicate that not all zakat management organizations in Sragen regency have applied zakat and infaq / alms accounting in accordance with SFAS 109. LAZISNU and LAZISMU have applied but for LAZISNU it is not yet complete because reports on changes in assets under management and notes on financial statements are not made. While BAZNAS and LAZKU have not made financial reports, they only present reports on receipt and distribution of funds.

Keywords: SFAS 109; Alms; Charity; Financial Statements
Earnings Response Coefficient : CSR Disclosure, Audit Committe and Default Risk
Authors: Nuriyanto Miftah Kamal , Nurbaiti Annisa , Aminah Wiwin
Published: April 2021

An investor needs to collect financial information as a matter of consideration in making his economic decision by using earning response coefficient. The value of ERC that appears will be goodnews when the value is raised high and will be badnews when the value of ERC is low. This research aims to test how the influence of CSR Disclosure, Audit Committee and Default Risk to Earnings Response Coefficient. The research was conducted on the basic and chemical industry sectors list on the IDX from 2015 to 2018. By using pusposive sampling technique obtained as many as 23 companies with 4 years observation time obtained amount 92 observations. Outliers performed 11 observations so that the number of observations used was 81 observations with Non-probability sampling. This research uses a descriptive statistical analysis technique and a data panel regression method. Results showed that the CSR Disclosure, Audit Committee, Default Risk simultaneously, has an influence on the earnings response coefficient. Partially, audit committee has a negative affect on the earnings response coefficient. While the CSR Disclosure and Default Risk has no affect on the earnings response coefficient.
The Influence of Accountability, Work Experience and Professionalism on The Quality of The Quality of The Work of Auditors
Authors: Simorangkir Sihol Marito , Bukit Jonathan Dubery , Hayati Keumala
Published: April 2021

The study was conducted aimed at examining the effect of accountability, work experience, and professionalism on the quality of auditor performance. auditors are required to have a high level of accountability because the auditor will present financial statements that must be accountable by himself. In addition to having a high accountability the auditor should also have good work experience so that the auditor can convey a logical and logical understanding of the errors contained in the financial statements. And auditors also require high professionalism so that auditors can carry out professional and good tasks. The object of research is the auditor who is working at the North Sumatra BPKP Office. The data is 70 respondents. The sampling method is the saturated sample technique. Analyze the data using validity, reliability and linear regression tests. And the results of the study prove that accountability has an influence on the quality of the work of the auditor, while work experience and professionalism do not have an influence on the quality of the work of the audiores.
The Influence of Accounting Information System Cash Sales and Internal Control of Sales Effectiveness
Authors: Kustianti Herlina
Published: April 2021

This purpose of this research is to: (1) determine the magnitude of the effect of the cash sales accounting information system on sales effectiveness. (2)determine the magnitude of the effect of internal control on sales effectiveness.The research subject was AUTO2000 Marketing Department of Toyota, the Soekarno Hatta Bandung branch and the object of research was accounting information systems and internal control and sales effectiveness. Data collection techniques used by distributing questionnaires to 35 respondents of Toyota AUTO2000 branch of Soekarno Hatta Bandung. The data obtained were then analyzed using validity test, descriptive method descriptive method, and verification method. The results of statistical testing in the accounting information system has a significant positive effect on sales effectiveness, internal control has a significant effect on sales effectiveness.
Disclosure of Sustainability Report on Financial Performance
Authors: Fauzi Derry Ridwan
Published: April 2021

The increasing number of companies that publish sustainability reports in Indonesia has led to an increasing trend of research on the relationship between sustainability reports and financial performance. However, the results of these studies are still inconsistent. Re-examining the relationship between the sustainability report disclosure and financial performance is the aim of this study. Two things that make this study different from the previous one, the first study uses companies that consistently report sustainability reports, and the second, use financial performance measures, profitability. The sample used was 33 observations from companies that consistently reported sustainability reports during the 2017-2019 period. The test results show that the social dimension (SO) of the sustainability report has no effect on financial performance, while the other two dimensions, namely the environment (EN) and the Economy (EC), have a positive effect on financial performance.
Analysis of Factors Affecting the Level Of E-Government Implementation in West Java
Authors: Ikhsan Syaiful , Afiah Nunuy Nur , Yudianto Ivan
Published: April 2021

In order to increase public accountability, transparency, and so that the government is more effective and efficient in running the government. Local governments use a tool called e-government. Not only has the objectives of transparency and accountability, the use of e-government application systems is expected to be able to improve the performance of local governments to be more economical, efficient and effective. This study aims to examine the effect of PAD, capital expenditure, financing revenue, PDRB, education level, and population factors on the e-government index value. Data analysis used linear regression analysis with quantitative research methods. The results of the study based on linear regression indicate that the PAD, capital expenditure, financing revenue, PDRB, and population factors have a positive effect on the e-government index value in regency / municipal governments in West Java.
Influence of Internal Control Systems and Accounting Information Systems on Good Corporate Governance
Authors: Lestari Kamilia
Published: April 2021

This study aims to determine how the influence of internal control systems and accounting information systems on good corporate governance at Perum Bulog (Logistics Business Entity) in Bandung City. The factors tested in this study are the internal control system and the accounting information system as independent variables. Meanwhile, good corporate governance is the dependent variable. The research method used in this research is the verification method. The study population was employees of Perum Bulog (Logistics Business Entity Public Company) in Bandung, totaling 4,151 employees. The sampling technique used was probability sampling with simple random sampling method using the Slovin formula, so that there were 97 employees of Perum Bulog in Bandung City. The analytical method used is multiple linear regression analysis using SPSS Version 23.00. The results of the research partially and simultaneously show that the internal control system and accounting information system have an effect on good corporate governance at Bulog Corporation in Bandung City. In addition, the magnitude of the influence of the internal control system and accounting information system in contributing to good corporate governance is 77.2%.
The Effect of Accounting Information Systems and Internal Control Systems on The Quality of Financial Statements at BPKAD
Authors: Kania Kania , Tanjung Abdul Hafiz
Published: April 2021

The Effect of Accounting Information Systems and Internal Control Systems on the Quality of Financial Statements at BPKAD Bandung

The dependent variable in this study is the Quality of Financial Statements. This study uses a sample through the process of dividing the population into strata or what is called stratified random sampling. The data in this study are primary data obtained from distributing questionnaires directly to employees who are directly involved in making financial reports. The results of the study partially show the information system and internal control system have an effect on the quality of the report.
Analysis of The Effect of Business Strategy on The Quality of Management Accounting Information Systems
Authors: Nuraliati Ayke , Sari Sianturi Twenty Selvia
Published: April 2021

Management accounting information system (SIAM) is used as a tool to produce financial and non-financial / management accounting information that is used to assist executive managers or internal parties in planning resource allocation, supervision, evaluation, and performance evaluation, both financial performance and non-financial performance including managerial performance and employee performance. Management accounting information systems refer to normative matters, but when management accounting information systems are implemented it has unexpected or unexpected consequences so that it can affect the satisfaction of users of information systems, this is because in the context of the organization and socially not well understood by users. This research was conducted on general insurance in Bandung where the respondents were operational managers using an explanatory survey method. Testing data using simple regression The results of research on insurance companies in Bandung found that business strategies affect the quality of management accounting information systems
Profitability Through Analysis of Amount of Credit and Liquidity Levels
Authors: Bramasto Ari , Anggadini Sri Dewi
Published: April 2021

Bank's business activities cannot be separated from public trust, so the health level of the bank needs to be maintained and the application of prudential principles in running its business. Banks are required to maintain the soundness level of the bank by paying attention to asset quality, capital adequacy, liquidity, management quality, and profitability, as well as solvency. This research has formulated several problems, namely: the relationship between the amount of credit, the level of liquidity, and profitability and to find out how much influence the amount of credit, the level of liquidity to profitability through Return on Assets (ROA). The purpose of the authors in conducting research is: to determine the relationship between the amount of credit, the level of liquidity, and profitability and to determine the influence of the amount of credit, the level of liquidity on profitability using ROA. The results of this study are recommended as input and information about the application of the amount of credit and the level of liquidity that can be used as the basis for the profitability as measured by ROA.
Impact of Recruitment and Selection Process on the Performance of Public Enterprises. A Study of the Nigeria Railway Corporation.
Authors: Hur-Yagba Ayangeadoo Alphonsus
Published: April 2021

This study examined the impact of the recruitment and selection process on the performance of employees in the Nigerian Railway Corporation. The population of the study is six hundred and fifty-six (656) staff, and a sample size of two hundred and forty-eight (248) was drawn using Taro Yamane's sample size determination technique. Survey and interview methods were used for data collection. The Ordinary Least Squares method of regression was used to analysed the data. Findings revealed that the recruitment and selection process has a significant influence on the train movement schedule of the Corporation, and Hypothesis one was therefore rejected. It also discovered that the recruitment and selection process, on average, have significant effects on the train maintenance culture of the Corporation, and Hypothesis two was similarly rejected. Finally, it equally revealed that the recruitment and selection process greatly elicited employees' innovation, particularly in the recruitment source and recruitment selection policy, consequently rejecting Hypothesis three. The study concluded that the recruitment and selection process greatly influenced employees' performance in the Corporation regarding hiring appropriate skills that handled train movement schedules except for the train maintenance culture. The study recommended that the Corporation review recruitment hiring policy to focus on meritocracy and brace up to internal and external sources of hiring appropriate personnel for train maintenance in the Corporation. Also, there should be no government or political interference regarding recruitment source and recruitment policy as being done now to stimulate employee selection.
Resource consumption and patient employability during systemic therapy and biological therapy
Authors: Kruglova L. S. , Hotko A. A.
Published: April 2021

An important aspect of the treatment of patients with psoriasis and psoriatic arthritis is the cost of the applied methods of therapy, the costs of the healthcare system associated with the treatment of such patients, and the effect of the disease on the ability to work. The costs of the health care system are the most important component of assessing the use of various methods of therapy and are characterized not only by the financial side, but also by the assessment of the workload of medical organizations and the health care system in general.Research results.During this program, it was found that the use of GIBP is associated with a decrease in the average duration of one hospitalization case: this indicator was 2.07 days, while in patients on other types of therapy it reached an average of 10.01 days. In patients receiving other types of therapy, the average number of hospitalizations in a round-the-clock hospital was significantly higher and amounted to 0.53 compared with the GAI — the indicator corresponded to 0.10. In addition, patients on the BAU were less likely to seek outpatient care and received fewer sick leaves, which were characterized by a shorter duration.Conclusions.The use of GIBP reduces the burden on the dermatological and rheumatological service, reduces the duration of hospitalizations, and significantly improves the socio-economic situation of patients due to a more significant preservation of their ability to work.
Applying real-world data to support regulatory decision — making in the United States
Authors: Borzova M. A. , Kolbin А. S.
Published: April 2021

The article describes the legal basis for the application of real-world data to support regulatory decision-making in the United States, as well as the possibility of implementing the relevant approaches in the legislation of the Eurasian Economic Union.
Ethical aspects of using software with artificial intelligence technology
Authors: Khokhlov A. L. , Belousov D. Yu.
Published: April 2021

Today, artificial intelligence (AI) technologies can offer solutions to many social problems, including those used to diagnose and treat diseases. However, for this it is necessary to provide an appropriate legal basis. The article presents a brief history of the development of AI, explains the conceptual apparatus, describes the legal basis for its development and implementation in Russian healthcare, the methodology for conducting clinical trials of AI systems, and gives their classification. Particular attention is paid to the ethical principles of clinical trials of AI systems. The ethical examination of projects of clinical trials of AI systems by the Ethics Committee is considered in detail.
Coming Full Circle - From CEFR to CEFR-J and back
Authors:   Tokyo University of Foreign Studies, Tono Yukio
Published: April 2021

The CEFR-J project was launched in Japan in 2008. The CEFR-J gives a set of Can Do descriptors for 10 CEFR sub levels (Pre-A1 to B2.2) and related Reference Level Description (RLD) work, whilst including developed profiling for vocabulary, grammar, and textual features were developed. In this article, the English resources created for the CEFR-J are applied in preparing teaching resources for other major European languages as well as Asian languages. To achieve this, a series of teaching/learning resources including the CEFR-J Wordlist and Phrase List initially developed for English were translated into 27 other languages using neural machine translation. These translated word and phrase lists were then manually corrected by a team of language experts. The automatic conversion of English to other languages was evaluated against human judgments as well as frequency analysis referencing web corpora. Three types of e-learning resources were created, taking into consideration the wordlists and the phrase lists for teaching those languages to undergraduate students: (1) a flash-card app for learning vocabulary, which allows for classification by both thematic topic and CEFR level, (2) an online syntax writing tool for the study of grammar and vocabulary, and (3) an online spoken and written production corpus collection tool.
Evaluasi Dan Perancangan Tata Letak Fasilitas Produksi Menggunakan Metode Analisis Craft (Studi Kasus Pabrik Pembuatan Bakso Jalan Brenggolo Kediri)
Authors: Baladraf Thabed Tholib , Fitri Salsabila Nanda Sintya , Harisah Dina , Sudarmono Tri Riwayati
Published: April 2021

Layout merupakan salah satu poin penting dalam merancang sistem produksi. Semakin jauh jarak antar departemen maka semakin tinggi biaya penanganan bahan dan semakin rendah produktivitas. Metode yang digunakan dalam penelitian ini adalah metode analisis CRAFT (Computerized Relative Allocation of Facilities Technique) sehingga mendapatkan solusi yang optimal. Penelitian ini dilakukan di pabrik pembuatan bakso Jalan Brenggolo Kediri. Penelitian ini bertujuan untuk mengevaluasi dan memberikan alternatif perubahan tata letak pada pabrik pembuatan bakso Jalan Brenggolo Kediri dengan menggunakan metode CRAFT dan dilanjutkan dengan menentukan alternatif perubahan tata letak yang paling efisien. Hasil penelitian menunjukkan bahwa ditemukan dua alternatif perubahan tata letak yang diusulkan guna memperbaiki tata letak fasilitas pabrik pembuatan bakso. Layout awal membutuhkan cost sebesar Rp. 6.210.880, alternatif pertama menunjukkan cost sebesar Rp. 5.353.920, alternatif kedua menunjukkan cost sebesar Rp. 5.274.117. Hal ini menunjukkan bahwa usulan alternatif pertama dapat menghemat cots sebesar 13,8% dan alternatif kedua dapatÂ  menghemat cost sebesar 15,1%.
Pengukuran Efisiensi Waktu Proses Produksi Pada Setiap Stasiun Kerja Pembuatan Keramik Model Guci Ukuran Tinggi 80 cm. (Studi Kasus Pada Home Industri Jaya Ceramik Yogyakarta)
Authors: Asih Puji
Published: April 2021

Perkembangan teknologi produksi yang meningkat Â diseluruh industri akan mengakibatkan Â produktivitasÂ  dan efisiensi waktu proses akan meningkat .Â  Perkembangan teknologi produksiÂ  terjadi hampir diseluruh industri , akibat perkembangan ini biasanya akan Â berdampak pada penempatan tenaga kerja yang harus sesuai dengan kebutuhan pekerjaan pada setiap stasiun kerja.Â  Â Â Penempatan tenaga kerja yang sesuai menjadiÂ  komponen yang signifikan dalam menyelesaikan perkerjaan dan efisiensi proses produksi . Penelitian dengan Judul Pengukuran Efisiensi Waktu Proses Produksi Pada Setiap Stasiun Kerja Pembuatan Keramik Model Guci Ukuran Tinggi 80 cm, bertujuan untuk mengetahui waktu baku dan efisiensi pada setiap stasiun kerja dan efisiensi lintasan produksiÂ  pembuatan keramik.Proses Produksi pembuatan keramik dibagi menjadi 4 stasiun kerja yaitu stasiun pembentukan keramik mentah ,stasiun pembakaran ,stasiun pengecekan Â dan stasiun Â pengecatan. Â Untuk menyelesaikan pekerjaan pada Â setiap stasiun kerja tersebut memerlukan waktu yang berbeda-beda Â sehinggaÂ  waktu baku dan efisiensi proses produksi juga berbeda-beda. Â Pengukuran waktu baku pada setiap stasiun kerja Â dapat diketahui, Â maka efisiensi waktu proses produksi dan efisiensi lintasan produksi Â dapat diketahui.Efisiensi yang dapat dicapai pada setiap stasiun kerja yang terbesar adalah pada stasiun kerja pembakaran mencapai 100 %, sedangkan efisiensi pada stasiun kerja yang lain masih rendah pada stasiun pembentukan 30,30 %, stasiun pengecekan dan penggosokan 26,20 % dan stasiun pengecatan 23,40%. Selanjutnya secara keseluruhan efisiensi lintasan produksi yang dapat dicapai masih rendah yaitu sebesar 30,86 %.Â
Kajian Manfaat Alkitab Menurut 2 Timotius 3:16 Dan Implikasinya Bagi Orang Percaya Masa Kini
Authors: Mau Marthen
Published: April 2021

The only special revelation is the Bible which God has breathed as the main source for human learning, so that it can organize his life responsibly in service and life every day. Today some people think that the Bible is outdated and of no longer useful to mankind because this is the age of science, technology, and art. However, some people still believe that the Bible is very useful for mankind, therefore the Bible must be studied carefully so that the contents of the Bible are understood as a whole. This paper aims to encourage and inspire new enthusiasm for believers to be active in studying God's word that has been breathed by God because reading God's words can show that God is speaking to his readers. This paper uses a qualitative research method with a deep exegetical study approach. Therefore, this article provides a viewpoint for believers to be loyal in reading the Bible because the Bible is very useful for believers to imply in today's life.
Bioverse: A Simulation Framework to Assess the Statistical Power of Future Biosignature Surveys
Authors: Bixel Alex , Apai Dániel
Published: April 2021

Next-generation space observatories will conduct the first systematic surveys of terrestrial exoplanet atmospheres and search for evidence of life beyond Earth. While in-depth observations of the nearest habitable worlds may yield enticing results, there are fundamental questions about planetary habitability and evolution that can only be answered through population-level studies of dozens to hundreds of terrestrial planets. To determine the requirements for next-generation observatories to address these questions, we have developed Bioverse. Bioverse combines existing knowledge of exoplanet statistics with a survey simulation and hypothesis testing framework to determine whether proposed space-based direct imaging and transit-spectroscopy surveys will be capable of detecting various hypothetical statistical relationships between the properties of terrestrial exoplanets. Following a description of the code, we apply Bioverse to determine whether an ambitious direct imaging or transit survey would be able to determine the extent of the circumstellar habitable zone and study the evolution of Earth-like planets. Given recent evidence that Earth-sized habitable zone planets are likely much rarer than previously believed, we find that space missions with large search volumes will be necessary to study the population of terrestrial and habitable worlds. Moving forward, Bioverse provides a methodology for performing trade studies of future observatory concepts to maximize their ability to address population-level questions, including and beyond the specific examples explored here.
High-resolution CARMA Observation of Molecular Gas in the North America and Pelican Nebulae
Authors: Kong Shuo , Arce Héctor G. , Carpenter John M. , Bally John , Ossenkopf-Okada Volker , Sánchez-Monge Álvaro , Sargent Anneila I. , Suri Sümeyye , McGehee Peregrine , Lis Dariusz C. , Klessen Ralf S. , Mairs Steve , Zucker Catherine , Smith Rowan J. , Nakamura Fumitaka , Pillai Thushara G. S. , Kauffmann Jens , Zhang Shaobo
Published: April 2021

In this paper, we present the first results from a CARMA high-resolution 12CO(1-0), 13CO(1-0), and C18O(1-0) molecular line survey of the North America and Pelican (NAP) Nebulae. CARMA observations have been combined with single-dish data from the Purple Mountain 13.7 m telescope, to add short spacings and to produce high-dynamic-range images. We find that the molecular gas is predominantly shaped by the W80 H ii bubble, driven by an O star. Several bright rims noted in the observation are probably remnant molecular clouds, heated and stripped by the massive star. Matching these rims in molecular lines and optical images, we construct a model of the three-dimensional structure of the NAP complex. Two groups of molecular clumps/filaments are on the near side of the bubble: one is being pushed toward us, whereas the other is moving toward the bubble. Another group is on the far side of the bubble, and moving away. The young stellar objects in the Gulf region reside in three different clusters, each hosted by a cloud from one of the three molecular clump groups. Although all gas content in the NAP is impacted by feedback from the central O star, some regions show no signs of star formation, while other areas clearly exhibit star formation activity. Additional molecular gas being carved by feedback includes cometary structures in the Pelican Head region, and the boomerang features at the boundary of the Gulf region. The results show that the NAP complex is an ideal place for the study of feedback effects on star formation.
A Gaussian Process Regression Reveals No Evidence for Planets Orbiting Kapteyn’s Star
Authors: Bortle Anna , Fausey Hallie , Ji Jinbiao , Dodson-Robinson Sarah , Ramirez Delgado Victor , Gizis John
Published: April 2021

Radial–velocity (RV) planet searches are often polluted by signals caused by gas motion at the star’s surface. Stellar activity can mimic or mask changes in the RVs caused by orbiting planets, resulting in false positives or missed detections. Here we use Gaussian process regression to disentangle the contradictory reports of planets versus rotation artifacts from Kapteyn’s star. To model rotation, we use joint quasiperiodic kernels for the RV and Hα signals, requiring that their periods and correlation timescales be the same. We find that the rotation period of Kapteyn’s star is 125 days, while the characteristic active-region lifetime is 694 days. Adding a planet to the RV model produces a best-fit orbital period of 100 yr, or 10 times the observing time baseline, indicating that the observed RVs are best explained by star rotation only. We also find no significant periodic signals in residual RV data sets constructed by subtracting off realizations of the best-fit rotation model and conclude that both previously reported “planets” are artifacts of the star’s rotation and activity. Our results highlight the pitfalls of using sinusoids to model quasiperiodic rotation signals.
The Stars Kepler Missed: Investigating the Kepler Target Selection Function Using Gaia DR2
Authors: Wolniewicz Linnea M. , Berger Travis A. , Huber Daniel
Published: April 2021

The Kepler Mission revolutionized exoplanet science and stellar astrophysics by obtaining highly precise photometry of over 200,000 stars over 4 yr. A critical piece of information to exploit Kepler data is its selection function, since all targets had to be selected from a sample of half a million stars on the Kepler CCDs using limited information. Here we use Gaia DR2 to reconstruct the Kepler selection function and explore possible biases with respect to evolutionary state, stellar multiplicity, and kinematics. We find that the Kepler target selection is nearly complete for stars brighter than Kp < 14 mag and was effective at selecting main-sequence stars, with the fraction of observed stars decreasing from 95% to 60% between 14 < Kp < 16 mag. We find that the observed fraction for subgiant stars is only 10% lower, confirming that a significant number of subgiants selected for observation were believed to be main-sequence stars. Conversely we find a strong selection bias against low-luminosity red giant stars (R ≈ 3–5R
⊙, T
eff ≈ 5500 K), dropping from 90% at Kp = 14 mag to below 30% at Kp = 16 mag, confirming that the target selection was efficient at distinguishing dwarfs from giants. We compare the Gaia Re-normalized Unit Weight Error (RUWE) values of the observed and nonobserved main-sequence stars and find a difference in elevated (>1.2) RUWE values at ∼σ significance, suggesting that the Kepler target selection shows some bias against either close or wide binaries. We furthermore use the Gaia proper motions to show that the Kepler selection function was unbiased with respect to kinematics.
An Atacama Large Millimeter/submillimeter Array Survey of Chemistry in Disks around M4–M5 Stars
Authors: Pegues Jamila , Öberg Karin I. , Bergner Jennifer B. , Huang Jane , Pascucci Ilaria , Teague Richard , Andrews Sean M. , Bergin Edwin A. , Cleeves L. Ilsedore , Guzmán Viviana V. , Long Feng , Qi Chunhua , Wilner David J.
Published: April 2021

M-stars are the most common hosts of planetary systems in the Galaxy. Protoplanetary disks around M-stars thus offer a prime opportunity to study the chemistry of planet-forming environments. We present an Atacama Large Millimeter/submillimeter Array survey of molecular line emission toward a sample of five protoplanetary disks around M4–M5 stars (FP Tau, J0432+1827, J1100-7619, J1545-3417, and Sz 69). These observations can resolve chemical structures down to tens of astronomical units. Molecular lines of 12CO, 13CO, C18O, C2H, and HCN are detected toward all five disks. Lines of H2CO and DCN are detected toward 2/5 and 1/5 disks, respectively. For disks with resolved C18O, C2H, HCN, and H2CO emission, we observe substructures similar to those previously found in disks around solar-type stars (e.g., rings, holes, and plateaus). C2H and HCN excitation conditions estimated interior to the pebble disk edge for the bright disk J1100-7619 are consistent with previous measurements around solar-type stars. The correlation previously found between C2H and HCN fluxes for solar-type disks extends to our M4–M5 disk sample, but the typical C2H/HCN ratio is higher for the M4–M5 disk sample. This latter finding is reminiscent of the hydrocarbon enhancements found by previous observational infrared surveys in the innermost (<10 au) regions of M-star disks, which is intriguing since our disk-averaged fluxes are heavily influenced by flux levels in the outermost disk, exterior to the pebble disk edge. Overall, most of the observable chemistry at 10–100 au appears similar for solar-type and M4–M5 disks, but hydrocarbons may be more abundant around the cooler stars.
Validation of Global EUV Wave MHD Simulations and Observational Techniques
Authors: Downs Cooper , Warmuth Alexander , Long David M. , Bloomfield D. Shaun , Kwon Ryun-Young , Veronig Astrid M. , Vourlidas Angelos , Vršnak Bojan
Published: April 2021

Global EUV waves remain a controversial phenomenon more than 20 yr after their discovery by SOHO/EIT. Although consensus is growing in the community that they are most likely large-amplitude waves or shocks, the wide variety of observations and techniques used to identify and analyze them have led to disagreements regarding their physical properties and interpretation. Here, we use a 3D magnetohydrodynamic (MHD) model of the solar corona to simulate an EUV wave event on 2009 February 13 to enable a detailed validation of the various commonly used detection and analysis techniques of global EUV waves. The simulated event exhibits comparable behavior to that of a real EUV wave event, with similar kinematic behavior and plasma parameter evolution. The kinematics of the wave are estimated via visual identification and profile analysis, with both approaches providing comparable results. We find that projection effects can affect the derived kinematics of the wave, due to the variation in fast-mode wave speed with height in the corona. Coronal seismology techniques typically used for estimates of the coronal magnetic field are also tested and found to estimate fast-mode speeds comparable to those of the model. Plasma density and temperature variations of the wave front are also derived using a regularized inversion approach and found to be consistent with observed wave events. These results indicate that global waves are best interpreted as large-amplitude waves and that they can be used to probe the coronal medium using well-defined analysis techniques.
The QuaStar Survey: Detecting Hidden Low-velocity Gas in the Milky Way’s Circumgalactic Medium
Authors: Bish Hannah V. , Werk Jessica K. , Peek Joshua , Zheng Yong , Putman Mary
Published: April 2021

From our position embedded within the Milky Way’s interstellar medium, we have limited ability to detect gas at low relative velocities in the extended Galactic halo because those spectral lines are blended with much stronger signals from dense foreground gas. As a result, the content of the Milky Way’s circumgalactic medium (CGM) is poorly constrained at ∣v
LSR∣ ≲150 km s−1. To overcome this complication, the QuaStar survey applies a spectral differencing technique using paired quasar−star sight lines to measure the obscured content of the Milky Way’s CGM for the first time. We present measurements of the C iv doublet (λ
λ1548, 1550), a rest-frame UV metal line transition, detected in Hubble Space Telescope/Cosmic Origins Spectrograph spectra of 30 halo-star/quasar pairs evenly distributed across the sky at Galactic latitudes ∣b∣ > 30°. The 30 halo stars have well-constrained distances (d ≈ 5–14 kpc) and are paired with quasars separated by <2.°8. We argue that the difference in absorption between the quasar and stellar sight lines originates primarily in the Milky Way’s extended CGM beyond ∼10 kpc. For the Milky Way’s extended, low-velocity CGM (∣v∣ <150 km s−1), we place an upper limit on the mean C iv column density of

Δ
log

N

LVCGM

< 13.39 and find a covering fraction of

f

C

IV
,
LVCGM

(
log
N
>
13.65
)

=

20% [6/30], a value significantly lower than the covering fraction for star-forming galaxies at low redshift. Our results suggest either that the bulk of Milky Way’s C iv -traced CGM lies at low Galactic latitudes or that the Milky Way’s CGM is lacking in warm, ionized material compared to low-redshift (z < 0.1) star-forming galaxy halos.
Deciphering Star Cluster Evolution by Shape Morphology
Authors: Hu Qingshun , Zhang Yu , Esamdin Ali , Liu Jinzhong , Zeng Xiangyun
Published: April 2021

We analyze the morphological evolution of open clusters and provide shape parameters for 265 open clusters. The results show that the overall shape of sample clusters becomes more elliptical as they grow older, while their core remains circular or slightly trending to circular. There is a negative correlation of the ellipticities with the number of members of the sample clusters. A significant negative correlation between the overall ellipticities and masses is also detected for the sample clusters with log(age/year) ≥8, suggesting that the overall shapes of the clusters are possibly influenced by the number of members and masses, in addition to the external forces and the surrounding environment. For most young sample clusters, the radial stratification degree of the short-axis direction is greater than that of the long, implying that the radial stratification degree in the two directions within the young sample cluster may be unevenly affected by an internal evolutionary process. Older sample clusters exhibit lower stratification in the tangential direction, which possibly means those clusters may continue to survive for a long time at a low level of stratification. Our analysis shows that the overall shape of the sample clusters may be more susceptible to the influence of Galactic tides toward the Galactic center than the shear forces embedded in Galactic differential rotation. By analyzing the distribution of the ages and number of members of star clusters, we suggest that NGC 6791 may originate from superclusters.
Elasticity of a Sintered Contact between Dust Grains
Authors: Sirono Sin-iti , Kudo Daiki
Published: April 2021

The collisional growth of dust grains in a protoplanetary nebula is impacted by sintering because this increases the elasticity of the neck between dust grains. The high elasticity of a neck can lead to bouncing and not sticking of dust aggregates. This hinders the formation of planetesimals, and dust aggregates accumulate at a particular location in a protoplanetary nebula. Following sintering, the key parameter is the elasticity of a neck between dust grains. This study determined elasticity using numerical simulation and laboratory experiments. Elasticity was substantially smaller than that of a previous model, in which it was assumed that only the neck between grains was deformed. However, the results of this study demonstrated a change is negligible in the sticking efficiency of sintered dust aggregates compared to the results in a previous study.
Statistical Properties of Solar Wind Upstream of Mars: MAVEN Observations
Authors: Liu Di , Rong Zhaojin , Gao Jiawei , He Jiansen , Klinger Lucy , Dunlop Malcolm Wray , Yan Limei , Fan Kai , Wei Yong
Published: April 2021

Using the data sets of Mars Atmosphere and Volatile EvolutioN and OMNI for the period 2014 October 10–2020 February 14 and the heliocentric distance of 1–1.66 au, we investigate the statistical properties of solar wind upstream of Mars for the first time. The key parameters, including interplanetary magnetic field (IMF), proton density (N), bulk velocity (∣
V
∣), and dynamic pressure (P
dyn), are surveyed with regard to variations of solar activity level and heliocentric distance. We find that the parameters ∣IMF∣, N, and P
dyn monotonously decrease with heliocentric distance. Both ∣IMF∣ and P
dyn are generally stronger at a higher solar activity level (F
10.7 ≥ 70 sfu), while such activity has little relevance to N. In contrast, ∣
V
∣ basically keeps a median of about 370 km s−1 and is insensitive to the solar activity level and heliocentric distance. We also find that the IMF upstream of Mars at the higher solar activity level has a much smaller spiral angle in the inward sector; thus, IMF seems “straighter” than that in the outward sector, although that is not so for the inward sector of the upstream of Earth. Our statistical survey can be used as a reference for upstream solar wind of Mars at 1.4 ∼ 1.7 au, and could benefit the studies on solar wind as well as the Martian space environment.
Magnetar-driven Shock Breakout Revisited and Implications for Double-peaked Type I Superluminous Supernovae
Authors: Liu Liang-Duan , Gao He , Wang Xiao-Feng , Yang Sheng
Published: April 2021

The discovery of early bumps in some type-I superluminous supernovae (SLSNe-I) before the main peaks offers an important clue to their energy source mechanisms. In this paper, we updated an analytic magnetar-powered model for fitting the multiband light curves of double-peaked SLSNe-I. The early bump is powered by magnetar-driven shock-breakout thermal emission, and the main peak is powered by a radiative diffusion through the supernova (SN) ejecta as in the standard magnetar-powered model. Generally, the diffusive luminosity is greater than the shock-breakout luminosity at the early time, which usually makes the shock-breakout bumps unclear to observe. To obtain a clear double-peaked light curve, inefficient magnetar heating at early times is required. This model is applied to three well-observed double-peaked SLSNe-I (i.e., SN2006oz, LSQ14bdq, and DES14Xtaz). We find that a relatively massive SN ejecta with M
ej ≃ 10.2–18.1M
⊙ and relatively large kinetic energy of SN ejecta

erg are required, and the thermalization efficiency of the magnetar heating is suppressed before t
delay, which is in the range of ≃15–43 days. The model can reproduce the observed light curves well, with a reasonable and similar set of physical parameters for both the early bump and the main peak, strengthening support for the magnetar-powered model. In the future, modeling of the double-peaked SLSNe-I will become more feasible as more events are discovered before the early bump.
SDSS-IV MaNGA: Characterizing E+A Galaxy Candidates in the Coma Cluster
Authors: Marinelli Mariarosa , Liu Charles T.
Published: April 2021

Using data from the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) Survey, we examined a subsample of 29 E+A galaxy candidates in the Coma Cluster. We created spatially-resolved maps of spectral features and the kinematics of the underlying stellar population by utilizing the Marvin toolkit. We rule out star formation in the entire subsample, and do not find evidence for AGN activity. For the majority of the subsample, stellar rotation is coherent.
Study on suicidal intent and its relationship with psychiatric morbidity in cases of deliberate self-harm
Authors: Pawar Shalaka S. , Tagad Prasad K. , Bhoge Nitin D. , Pawar Alka V.
Published: April 2021

Background:

Mental disorders are among the strongest predictors of suicide attempts. However, little is known regarding which disorders that is uniquely associated with suicidal behavior because of high levels of psychiatric co-morbidity. The present study was planned to undertake on suicidal intent in such deliberate self-harm patients.

Aims:

The aim is to determine the suicidal intent and to assess the relationship with psychiatric morbidity in patients of deliberate self-harm

Settings:

Patients of deliberate self-harm.

Design:

Cross-sectional study.

Materials and Methods:

The sample consisted of 50 patients of deliberate self-harm admitted during study period of 6 months in appropriate in-patient unit for observation and necessary intervention, who fulfils inclusion criteria. A semi structured pro forma was used for collection of socio-demographic data, case history and Beck's Suicide intent scale was used which is designed to assess the severity of intention to die associated with an episode of deliberate self-harm.

Statistical Analysis Used:

Descriptive statistics such as mean, standard deviation, and percentage was used to present the data. To assess the relationship between the suicidal intent and psychiatric morbidity, Chi-square test was used. A P < 0.05 were considered significant. Data analysis was performed using software SPSS v20.0.

Results:

Self poisoning (80%) was found to be the most common method employed in deliberate self-harm. 74% of the deliberate self-harm attempts were impulsive in nature. Altercation with the spouse (30%) was the most common precipitating factor. Psychiatric morbidity was found to be associated with suicidal intent (P = 0.0068).

Conclusions:

In conclusion, even with low intent to harm self we have to be careful while examining the patients of psychiatric morbidity. They are at risk of attempting harm to self. We cannot ignore the patients just on the basis of low intent to harm self.