bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analisis Sistem Informasi Manajemen Pada E-Commerce Shopee
Authors: Nadillah Tiara Waty S.  , Thalita Elsa Pramudita  , Indah Novita Sari  
Published: March 2022

Abstract
The research aims to determine the definition of e-commerce, the development of e-commerce in the Shopee application, to know the implementation of the Management Information System used in the implementation of buying and selling activities at Shopee E-Commerce by collecting and managing all data from the various features provided, summarizing and then facilitating and improve the quality of decision making to increase the productivity and profitability of E-Commerce Shopee, so that it can be implemented in a more systematic and structured manner. E-commerce is an act of buying and selling electronically using the internet as a medium, and Shopee is one of them. There are at least 4 Management Information Systems on Shopee. The Strengths and Weaknesses and Challenges faced by Shopee will be discussed further. The research method used is a qualitative method with a literature study. The data collection technique used is literature study. The data source used is secondary data in the form of an overview of various references about E-Commerce Shopee, the features provided and the type of Management Information System at Shopee. The results of the study indicate that there are several problems that must be faced so that improvements are needed, especially in the management information system that is being implemented.

Abstrak
Penelitian ini bertujuan untuk mengetahui Pengertian e-commerce, perkembangan e-commerce pada aplikasi shopee, mengetahui penerapan Sistem Informasi Manajemen yang digunakan dalam penyelenggaraan aktivitas jual beli pada E-Commerce Shopee dengan mengumpulkan dan mengatur semua data dari berbagai fitur yang disediakan, meringkas kemudian memfasilitasi dan meningkatkan kualitas dari pengambilan keputusan untuk meningkatkan produktivitas dan profitabilitas E-Commerce Shopee, sehingga bisa diimplementasikan secara lebih tersistem dan terstruktur. E-commerce merupakan suatu tindakan proses jual dan beli secara elektronik menggunakan internet sebagai medianya, dan Shopee adalah salah satunya. Sedikitnya ada 4 Sistem Informasi Manajemen pada Shopee. Kelebihan dan Kelemahan serta Tantangan yang dihadapi Shopee akan dibahas lebih lanjut. Metode penelitian yang digunakan adalah metode kualitatif dengan studi literatur. Teknik pengumpulan data yang digunakan yaitu dengan studi pustaka. Sumber data yang dipakai adalah data sekunder berupa gambaran umum dari berbagai referensi tentang E-Commerce Shopee, fitur yang disediakan dan jenis Sistem Informasi Manajemen di Shopee. Hasil penelitian menunjukkan bahwa ada beberapa permasalahan yang harus dihadapi sehingga perlu adanya perbaikan khususnya pada sistem informasi manajemen yang dijalankan.
Implementasi Aplikasi Sistem Informasi Akuntansi Pada Bumdesa Lestari Jaya
Authors: Putri Ariella Belinda  , Prayuga Kurniawan  
Published: March 2022

Abstract
Along with the development of an era, BUMDes is expected to improve welfare in the village by creating conducive conditions for employees to carry out accounting information system management work. With the application of the BUMDes Accounting Information System, it really helps the computerized financial administration process. This study aims to deepen understanding of the implementation of accounting information system applications at BUMDesa LESTARI JAYA, Bendo Village, Gondang District, Tulungagung Regency. This study uses a qualitative descriptive method with data collection procedures using observation, interviews and literature study. The results show that this BUMDes was established as a way to help the community meet their needs, and the simple and easy operation of the BUMDes SIA application can improve the quality of BUMDes financial governance.

Abstrak
Seiring berkembangnya suatu jaman, BUMDes diharapkan dapat meningkatkan kesejahteraan di desa dengan menciptakan kondisi yang kondusif bagi pegawai untuk melakukan pekerjaan pengelolaan sistem informasi akuntansi. Dengan penerapan aplikasi sistem informasi akuntansi BUMDes sangatlah membantu proses administrasi keuangan terkomputerisasi. Penelitian ini bertujuan untuk memperdalam pemahaman tentang implementasi aplikasi sistem informasi akuntansi pada BUMDesa Lestari Jaya, Desa Bendo, Kecamatan Gondang, Kabupaten Tulungagung. Penelitian ini menggunakan metode deskriptif kualitatif dengan prosedur penghimpunan data melalui observasi, wawancara dan studi pustaka. Hasil penelitian menunjukkan bahwa BUMDes ini didirikan sebagai salah satu cara untuk membantu masyarakat memenuhi kebutuhan mereka, dan pengoperasian aplikasi SIA BUMDes yang sederhana dan mudah dapat meningkatkan kualitas tata kelola keuangan BUMDes.
Modular and Fractional $L$-Intersecting Families of Vector Spaces
Authors: Mathew Rogers , Kumar Mishra Tapas , Ray Ritabrata , Srivastava Shashank 
Published: March 2022

This paper is divided into two logical parts. In the first part of this paper, we prove the following theorem which is the $q$-analogue of a generalized modular Ray-Chaudhuri-Wilson Theorem shown in [Alon, Babai, Suzuki, J. Combin. Theory Series A, 1991]. It is also a generalization of the main theorem in [Frankl and Graham, European J. Combin. 1985] under certain circumstances.
$\bullet$ Let $V$ be a vector space of dimension $n$ over a finite field of size $q$. Let $K = \{k_1, \ldots , k_r\},L = \{\mu_1, \ldots , \mu_s\}$ be two disjoint subsets of $\{0,1, \ldots , b-1\}$ with $k_1 < \cdots < k_r$. Let $\mathcal{F} = \{V_1,V_2,\ldots,V_m\}$ be a family of subspaces of $V$ such that (a) for every $i \in [m]$, dim($V_i$) $\bmod~ b = k_t$, for some $k_t \in K$, and (b) for every distinct $i,j \in [m]$, dim($V_i \cap V_j$)$\bmod~ b = \mu_t$, for some $\mu_t \in L$. Moreover, it is given that neither of the following two conditions hold:

$q+1$ is a power of 2, and $b=2$
$q=2, b=6$.

Then,
$|\mathcal{F}| \leqslant \begin{cases}N(n,s,r,q), & \textrm{ if }\left(s+k_r \leqslant n \textrm { and } r(s-r+1) \leqslant b-1\right) \textrm{ or } (s < k_1 + r)\\ N(n,s,r,q) + \sum_{t \in [r]}\left[\begin{matrix} n \\ k \end{matrix} \right]_{q}, & \textrm{otherwise,} \end{cases}$
where $N(n,s,r,q) := \left[\begin{matrix} n \\ s \end{matrix} \right]_{q} + \left[\begin{matrix} n \\ s-1 \end{matrix} \right]_{q} + \cdots + \left[\begin{matrix} n \\ s-r+1 \end{matrix} \right]_{q}.$
In the second part of this paper, we prove $q$-analogues of results on a recent notion called fractional $L$-intersecting family of sets for families of subspaces of a given vector space over a finite field of size $q$. We use the above theorem to obtain a general upper bound to the cardinality of such families. We give an improvement to this general upper bound in certain special cases.
Sharp Upper and Lower Bounds on a Restricted Class of Convex Characters
Authors: Kelk Steven , Meuwese Ruben 
Published: March 2022

Let $\mathcal{T}$ be an unrooted binary tree with $n$ distinctly labelled leaves. Deriving its name from the field of phylogenetics, a convex character on $\mathcal{T}$ is simply a partition of the leaves such that the minimal spanning subtrees induced by the blocks of the partition are mutually disjoint. In earlier work Kelk and Stamoulis (Advances in Applied Mathematics 84 (2017), pp. 34–46) defined $g_k(\mathcal{T})$ as the number of convex characters where each block has at least $k$ leaves. Exact expressions were given for $g_1$ and $g_2$, where the topology of $\mathcal{T}$ turns out to be irrelevant, and it was noted that for $k \geq 3$ topological neutrality no longer holds. In this article, for every $k \geq 3$ we describe tree topologies achieving the maximum and minimum values of $g_k$ and determine corresponding expressions and exponential bounds for $g_k$. Finally, we reflect briefly on possible algorithmic applications of these results.
Cutting a Cake for Infinitely Many Guests
Authors: Jankó Zsuzsanna , Joó Attila 
Published: March 2022

Fair division with unequal shares is an intensively studied resource allocation problem. For $i\in [n] $, let $\mu_i $ be an atomless probability measure on the measurable space $(C,\mathcal{S})$ and let $t_i$ be positive numbers (entitlements) with $\sum_{i=1}^{n}t_i=1$. A fair division is a partition of $C$ into sets $S_i\in \mathcal{S} $ with $\mu_i(S_i)\geq t_i$ for every $i\in [n]$.
We introduce new algorithms to solve the fair division problem with irrational entitlements. They are based on the classical Last diminisher technique and we believe that they are simpler than the known methods. Then we show that a fair division always exists even for infinitely many players.
Testing the validity of a self-report scale, author recognition test, and book counting as measures of lifetime exposure to print fiction
Authors: Wimmer Lena , Ferguson Heather J 
Published: March 2022

AbstractWe report a study testing the validity of the three most commonly used indicators of lifetime exposure to print fiction, namely a self-report scale, an author recognition test (ART), and book counting, in a sample of older adults (N=306; Mage = 59.29 years, SDage = 7.01). Convergent validity of the self-report scale and book counting was assessed through correlations with the fiction sub-score of the ART; divergent validity of these two indicators was examined via correlations with the non-fiction sub-score of that ART. We also assessed criterion-related validity by testing the degree to which each of the three indicators predicted participants’ performance in a vocabulary test. The self-report scale and book counting were significantly more positively associated with the ART fiction sub-score than the ART non-fiction sub-score. Regression analyses, controlling for gender and non-fiction exposure, revealed that the ART fiction sub-score had the highest explanatory power among all indicators under investigation for predicting vocabulary test performance. The present results suggest that only ARTs may have satisfactory levels of both construct and criterion-related validity. Recommendations for the assessment of fiction exposure and future directions are discussed.
Confirming the 3:2 Resonance Chain of K2-138
Authors: MacDonald Mariah G. , Feil Leonard , Quinn Tyler , Rice David 
Published: March 2022

Abstract
The study of orbital resonances allows for the constraint of planetary properties of compact systems. K2-138 is an early K-type star with six planets, five of which have been proposed to be in the longest chain of 3:2 mean motion resonances. To observe and potentially verify the resonant behavior of K2-138's planets, we run N-body simulations using previously measured parameters. Through our analysis, we find that 99.2% of our simulations result in a chain of 3:2 resonances, although only 11% of them show a five-planet resonance chain. We find that we are able to use resonances to constrain the orbital periods and masses of the planets. We explore the possibility of this system forming in situ and through disk migration, and we investigate the potential compositions of each planet using a planet structure code.
The Pulsating Helium-atmosphere White Dwarfs. I. New DBVs from the Sloan Digital Sky Survey
Authors: Vanderbosch Zachary P. , Hermes J. J. , Winget Don E. , Montgomery Michael H. , Bell Keaton J. , Nitta Atsuko , Kepler S. O. 
Published: March 2022

Abstract
We present a dedicated search for new pulsating helium-atmosphere (DBV) white dwarfs from the Sloan Digital Sky Survey using the McDonald 2.1 m Otto Struve Telescope. In total we observed 55 DB and DBA white dwarfs with spectroscopic temperatures between 19,000 and 35,000 K. We find 19 new DBVs and place upper limits on variability for the remaining 36 objects. In combination with previously known DBVs, we use these objects to provide an update to the empirical extent of the DB instability strip. With our sample of new DBVs, the red edge is better constrained, as we nearly double the number of DBVs known between 20,000 and 24,000 K. We do not find any new DBVs hotter than PG 0112+104, the current hottest DBV is at T
eff ≈ 31,000 K, but do find pulsations in four DBVs with temperatures between 27,000 and 30,000 K, improving empirical constraints on the poorly defined blue edge. We investigate the ensemble pulsation properties of all currently known DBVs, finding that the weighted mean period and total pulsation power exhibit trends with effective temperature that are qualitatively similar to the pulsating hydrogen-atmosphere white dwarfs.
Instrumental Tip-of-the-iceberg Effects on the Prompt Emission of Swift/BAT Gamma-ray Bursts
Authors: Moss Michael , Lien Amy , Guiriec Sylvain , Cenko S. Bradley , Sakamoto Takanori 
Published: March 2022

Abstract
The observed durations of prompt gamma-ray emission from gamma-ray bursts (GRBs) are often used to infer the progenitors and energetics of the sources. Inaccurate duration measurements will have a significant impact on constraining the processes powering the bursts. The “tip-of-the-iceberg” effect describes how the observed signal is lost into background noise; lower instrument sensitivity leads to higher measurement bias. In this study, we investigate how observing conditions, such as the number of enabled detectors, background level, and incident angle of the source relative to the detector plane, affect the measured duration of GRB prompt emission observed with the Burst Alert Telescope on board the Neil Gehrels Swift Observatory (Swift/BAT). We generate “simple-pulse” light curves from an analytical fast rise exponential decay function and from a sample of eight real GRB light curves. We fold these through the Swift/BAT instrument response function to simulate light curves Swift/BAT would have observed for specific observing conditions. We find duration measurements are highly sensitive to observing conditions and the incident angle of the source has the highest impact on measurement bias. In most cases duration measurements of synthetic light curves are significantly shorter than the true burst duration. For the majority of our sample, the percentage of duration measurements consistent with the true duration is as low as ∼25%–45%. In this article, we provide quantification of the tip-of-the-iceberg effect on GRB light curves due to Swift/BAT instrumental effects for several unique light curves.
Magnetic Winding as an Indicator of Flare Activity in Solar Active Regions
Authors: Raphaldini Breno , Prior Christopher B. , MacTaggart David 
Published: March 2022

Abstract
Magnetic helicity is a measure of the entanglement of magnetic field lines used to characterize the complexity of solar active region (AR) magnetic fields. Previous attempts to use helicity-based indicators to predict solar eruptive/flaring events have shown promise but not been universally successful. Here we investigate the use of a quantity associated with the magnetic helicity, the magnetic winding, as a means to predict flaring activity. This quantity represents the fundamental entanglement of magnetic field lines and is independent of the magnetic field strength. We use vector magnetogram data derived from the Helioseismic Magnetic Imager (HMI) to calculate the evolution and distribution of the magnetic winding flux associated with five different ARs, three of them with little flaring activity/nonflaring (AR 11318, AR 12119, AR 12285) and two highly active with X-class flares (AR 11158, AR 12673). We decompose these quantities into “current-carrying” and “potential” parts. It is shown that the ARs that show flaring/eruptive activity have significant contributions to the winding input from the current-carrying part of the field. A significant and rapid input of current-carrying winding is found to be a precursor of flaring/eruptive activity, and, in conjunction with the helicity, sharp inputs of both quantities are found to precede individual flaring events by several hours. This suggests that the emergence/submergence of topologically complex current-carrying field is an important element for the ignition of AR flaring.
Short- and Mid-term Periodicities Observed in Neutron Monitor Counting Rates throughout Solar Cycles 20–24
Authors: López-Comazzi A. , Blanco J. J. 
Published: March 2022

Abstract
This paper examines the short- and mid-term periodicities (≲2 yr) in the cosmic-ray flux along 55 yr, from 1964 to 2019. The cosmic-ray flux has been computed by averaging the counting rates, in typified units, of a set of selected neutron monitors. This builds a representative virtual neutron monitor, named the global neutron monitor. The relevant discovered periodicities are ∼13.5, ∼27, ∼46–64, ∼79–83 day; Rieger-type (∼134–190 days); ∼225–309 day; and ∼1.06–1.15, ∼1.31–1.40, and ∼1.75–2.20 yr periods. The same analyses have been applied to the sunspot number (SSN) with the aim to compare the discovered periodicities and look for possible origins of these periodicities. Two main results have been achieved: the periodicities of 77–83 days, 134–190 days (Rieger type), 225–309 days, ∼1.3 yr, and ∼1.7 yr could be related to the solar dynamo, and an inversely linear relationship has been found between the average of the SSN versus the duration time for each solar cycle of the ∼1.75–2.20 yr period.
On the Application of the Equal-contrast Technique to Ca-K Data from Kodaikanal and Other Observatories
Authors: Singh Jagdev , Priyal Muthu , Ravindra Belur , Bertello Luca , Pevtsov Alexei A. 
Published: March 2022

Abstract
The “equal-contrast technique” (ECT) methodology, developed by Singh et al. to generate uniform long time series of Ca-K images obtained during the 20th century from the Kodaikanal Observatory (KO), improved the correlation between the plage area and sunspot parameters. The same methodology can also be used on other observatory data taken with different instruments. We can combine such ECT-corrected images to reduce the gaps in the observations and make a long uniform data set to study short- and long-term variations. We apply this procedure to Mount Wilson Observatory (MWO) historical Ca-K data and recent Ca-K filtergrams obtained using narrowband filters at KO and the Mauna Loa Solar Observatory (MLSO). To determine the success of this method, the results of the analysis of the ECT images obtained from KO, MWO, and MLSO are compared. A comparison of the plage and active areas derived from KO and MWO images before and after the ECT procedure indicates an improvement in the correlation coefficients (CCs) between all the data sets after the ECT application. The CC for the combined monthly mean Ca-K plage area derived from the KO, MWO, and Precision Solar Photometric Telescope (at the MLSO) data with sunspot numbers is 0.96 for the period 1905–2015. The paper demonstrates that the time series of Ca-K data obtained from different instruments after applying the ECT procedure becomes uniform in contrast. The combined time series of KO and MWO spectroheliograms has 12 hr intervals compared to the ≈24 hr gap for a time series from a single observatory.
Compact-object Formation, Retention, and Growth through Accretion onto Gas-embedded White Dwarfs/Neutron Stars in Gas-enriched Globular Clusters
Authors: Perets Hagai B. 
Published: March 2022

Abstract
Observations of pulsars in globular clusters (GCs) give evidence that more than >10%–20% of neutron stars (NSs) that ever formed in GCs were retained there. However, the velocity distribution of field pulsars peaks at 5–10 times the escape velocities of GCs. Consequently, only a small fraction of GC NSs should have been retained, which is potentially difficult to explain even accounting for low-velocity NSs formed through electron-capture supernovae (SNe). Thus, too few low-velocity NSs should have been retained, giving rise to the NS retention problem in GCs. Here we suggest a novel solution, in which the progenitors of most GC NSs were ONe white dwarfs (WDs) that accreted ambient intracluster gas and formed low-velocity NSs through accretion-induced collapse (AIC). The existence of an early gas-enriched environment in GCs is supported by observations of multiple stellar populations in GCs. It is thought that 10–100s of megayears after the formation of the first generation of stars, and after ONe WDs were already formed, GCs were replenished with gas, which formed a second generation of stars. Accretion of such replenished gas onto the ONe WDs catalyzed the AIC processes. The number of AIC-formed NSs is then sufficient to explain the large number of NSs retained in GCs. Similar processes might also drive CO WDs to produce Type Ia SNe or to merge and form NSs and similarly drive NSs to AIC and mergers producing BHs. Moreover, the wide variety of gas-catalyzed binary mergers and explosive transients suggested to occur in the gas-rich environments of an active galactic nucleus disk could similarly, and even more efficiently, occur in second-generation gas in GCs.
Green balance in urban areas as an indicator for policy support: a multi-level application
Authors: Zulian Grazia , Marando Federica , Mentaschi Lorenzo , Alzetta Claudia , Wilk Bettina , Maes Joachim 
Published: March 2022

Green spaces are increasingly recognised as key elements in enhancing urban resilience as they provide several ecosystem services. Therefore, their implementation and monitoring in cities are crucial to meet sustainability targets.
In this paper, we provide a methodology to compute an indicator that assesses changes in vegetation cover within Urban Green Infrastructure (UGI). Such an indicator is adopted as one of the indicators for reporting on the key area “nature and biodiversity” in the Green City Accord (GCA).
In the first section, the key steps to derive the indicator are described and a script, which computes the trends in vegetation cover using Google Earth Engine (GEE), is provided.
The second section describes the application of the indicator in a multi-scale, policy-orientated perspective. The analysis has been carried out in 696 European Functional Urban Areas (FUAs), considering changes in vegetation cover inside UGI between 1996 and 2018. Results were analysed for the EU and the United Kingdom. The Municipality of Padua (Italy) is used as a case study to illustrate the results at the local level.
Over the last 22 years, a slight upward trend characterised the vegetation growth within UGI in European FUAs. Within core cities and densily built-upcommuting zones, the trend was stable; in non-densely built-up areas, an upward trend was recorded. Vegetation cover in UGI has been relatively stable in European cities. However, a negative balance between abrupt changes in greening and browning has been recorded, affecting most parts of European cities (75% of core cities and 77% of commuting zones in densely built-up areas). This still indicates ongoing land take with no compensation of green spaces that are lost to artificial areas.
Focusing on the FUA of Padua, a downward trend was observed in 33.3% and 12.9% of UGI in densely built-up and not-densely built-up areas, respectively. Within the FUA of Padua, most municipalities are characterised by a negative balance between abrupt greening and browning, both in non-densely built-up and densely built-up areas.
This approach complements traditional metrics, such as the extent of UGI or tree canopy cover, by providing a valuable measure of condition of urban ecosystems and an instrument to monitor the impact of land take.