bluuebunny/crossref_metadata_2025_split huggingface dataset:
Etnomatematika Usaha Kerajinan Anyaman Rotan Masyarakat Gresik dalam Perspektif Literasi Matematis
Authors: Kusuma Wurdani Winda Putri Ayu , Budiarto Mega Teguh 
Published: August 2021

Budaya sekitar dapat dijadikan sebagai bahan ajar dalam matematika. Pembelajaran matematika berbasis budaya disebut dengan etnomatematika. Salah satu bentuk budaya yang ada yaitu budaya masyarakat Gresik. Tujuan dari penelitian ini yaitu untuk mengidentifikasi dan mendeskripsikan etnomatematika apa saja yang terdapat pada sistem mata pencaharian usaha kerajinan anyaman rotan, serta mendeskripsikan bentuk literasi matematis pada usaha kerajinan anyaman rotan masyarakat Gresik. Subjek penelitian ini yaitu 4 orang pengrajin anyaman rotan masyarakat Gresik. Penelitian ini termasuk penelitian kualitatif dengan pendekatan etnografi. Berdasarkan pengumpulan data ditemukan adanya konsep matematika pada usaha kerajinan anyaman rotan yaitu terdapat aktivitas mengukur berupa konsep pengukuran dalam pembuatan kerajinan anyaman rotan serta terdapat konsep geometri pada bentuk kerajinan tersebut diantaranya yaitu konsep lingkaran, bangun ruang sisi datar berupa balok, bangun ruang sisi lengkung berupa tabung tanpa tutup, dan transformasi (refleksi dan translasi). Dengan konsep matematika yang ditemukan tersebut dapat diterapkan dalam pembelajaran matematika sehingga akan membantu siswa memahami konsep matematika serta memiliki kemampuan literasi matematis. Siswa harus memiliki kemampuan literasi matematis agar dapat menggunakan matematika secara kontekstual.
THE PROBLEM OF NOMINATION OF THE SUBJECTS OF SPEECH THROUGH NARRATOLOGY PRISM (ON THE MATERIAL FROM “MIRROR STORY” BY ILSE AICHINGER)
Authors: Матвеева Ирина Владимировна , Зинцова Юлия Николаевна , Саможенов Сергей Николаевич 
Published: August 2021

Коммуникативно-прагматический потенциал поля персональности рассматривается в данной статье через призму художественного произведения «Зеркальная новелла» австрийской писательницы И. Айхингер. Анализ приемов автора для передачи авторского отношения к событиям и героям позволяет утверждать, что коммуникативное пространство в новелле раскрывается за счет зеркальной символики. Анализ видов зеркал и их физических свойств позволяет наблюдать следующие коммуникативные роли: сфера говорящего представлена личным местоимением ich, а также местоимениями du, ihr в их вторичной номинации. Анализ коммуникативно-прагматического потенциала «я»-субъекта в нарративном контексте показал возможности единиц функционально - семантического поля персональности выражать отношение субъекта речи к субъектам коммуникативной ситуации. Таким образом, адресант в процессе интеракции способен эксплицировать переносные смыслы. Эти транспозиции коммуникативных местоименных форм не только выполняют смыслонесущую функцию, но и позволяют отразить новые неожиданные коннотации как интерактивные отношения конкретных коммуникантов: включение местоимения не по его лингвистической сущности, не по морфологическому признаку, не по функциональному признаку, где он может или не может быть субъектом, а по признаку коммуникации. Все это свидетельствует о полисемантичности такой философской модели коммуникации, в которой присутствуют не только эмитент, реципиент и неучастник коммуникации, но еще и нададресат.
This article deals with the communicative-pragmatic potential of the field of the personality through the prism of the literary work “Mirror Story” by the Austrian authoress I. Aichinger. The communicative space in the novel is revealed through mirror symbolism. The distribution of roles between the participants in the communicative process occurs precisely through the mirror perspective. The speaker’s sphere is represented by the personal pronoun ich, as well as by the pronouns du, ihr in their secondary nomination. The analysis of the communicative-pragmatic potential of the “I”-subject in a narrative context showed the ability of the units of the functional-semantic field of the personality to express the attitude of the subject of speech to the subjects of the communicative situation. In this way the speaker in the process of interaction can “take the role of another” and assume how he was perceived by a recipient. These transpositions of communicative pronoun forms have not only new meaning, but also allow us to reflect new unexpected connotations, like the interactive relations of specific communicants. All this indicate the polysemancy of such a philosophical model of communication, in which not only the speaker, recipient and non-participant in communication are present, but also the over-recipient.
A Plasmoid model for the Sgr A* Flares Observed With Gravity and CHANDRA
Authors: Ball David , Özel Feryal , Christian Pierre , Chan Chi-Kwan , Psaltis Dimitrios 
Published: August 2021

Abstract
The Galactic Center black hole Sgr A* shows significant variability and flares in the submillimeter, infrared, and X-ray wavelengths. Owing to its exquisite resolution in the IR bands, the GRAVITY experiment for the first time spatially resolved the locations of three flares and showed that a bright region moves in ellipse-like trajectories close to, but offset from, the black hole over the course of each event. We present a model for plasmoids that form during reconnection events and orbit in the coronal region around a black hole to explain these observations. We utilize general-relativistic radiative-transfer calculations that include effects from finite light travel time, plasmoid motion, particle acceleration, and synchrotron cooling, and obtain a rich structure in the flare light curves. This model can naturally account for the observed motion of the bright regions observed by the GRAVITY experiment and the offset between the center of the centroid motion and the position of the black hole. It also explains why some flares may be double peaked while others have only a single peak and uncovers a correlation between the structure in the light curve and the location of the flare. Finally, we make predictions for future observations of flares from the inner accretion flow of Sgr A* that will provide a test of this model.
The NANOGrav 12.5 Year Data Set: Monitoring Interstellar Scattering Delays
Authors: Turner Jacob E. , McLaughlin Maura A. , Cordes James M. , Lam Michael T. , Shapiro-Albert Brent J. , Stinebring Daniel R. , Arzoumanian Zaven , Blumer Harsha , Brook Paul R. , Chatterjee Shami , Cromartie H. Thankful , DeCesar Megan E. , Demorest Paul B. , Dolch Timothy , Ellis Justin A. , Ferdman Robert D. , Ferrara Elizabeth C. , Fonseca Emmanuel , Garver-Daniels Nathan , Gentile Peter A. , Good Deborah C. , Jones Megan L. , Lazio T. Joseph W. , Lorimer Duncan R. , Luo Jing , Lynch Ryan S. , Ng Cherry , Nice David J. , Pennucci Timothy T. , Pol Nihan S. , Ransom Scott M. , Spiewak Renée , Stairs Ingrid H. , Stovall Kevin , Swiggum Joseph K. , Vigeland Sarah J. 
Published: August 2021

Abstract
We extract interstellar scintillation parameters for pulsars observed by the NANOGrav radio pulsar timing program. Dynamic spectra for the observing epochs of each pulsar were used to obtain estimates of scintillation timescales, scintillation bandwidths, and the corresponding scattering delays using a stretching algorithm to account for frequency-dependent scaling. We were able to measure scintillation bandwidths for 28 pulsars at 1500 MHz and 15 pulsars at 820 MHz. We examine scaling behavior for 17 pulsars and find power-law indices ranging from −0.7 to −3.6, though these may be biased shallow due to insufficient frequency resolution at lower frequencies. We were also able to measure scintillation timescales for six pulsars at 1500 MHz and seven pulsars at 820 MHz. There is fair agreement between our scattering delay measurements and electron-density model predictions for most pulsars. We derive interstellar scattering-based transverse velocities assuming isotropic scattering and a scattering screen halfway between the pulsar and Earth. We also estimate the location of the scattering screens assuming proper motion and interstellar scattering-derived transverse velocities are equal. We find no correlations between variations in scattering delay and either variations in dispersion measure or flux density. For most pulsars for which scattering delays are measurable, we find that time-of-arrival uncertainties for a given epoch are larger than our scattering delay measurements, indicating that variable scattering delays are currently subdominant in our overall noise budget but are important for achieving precisions of tens of nanoseconds or less.
How Metals Are Transported in and out of a Galactic Disk: Dependence on the Hydrodynamic Schemes in Numerical Simulations
Authors: Shin Eun-Jin , Kim Ji-Hoon , Oh Boon Kiat 
Published: August 2021

Abstract
Metallicity is a fundamental probe for understanding the baryon physics in a galaxy. Since metals are intricately associated with radiative cooling, star formation, and stellar feedback, reproducing the observed metal distribution through numerical experiments will provide a prominent way to examine our understanding of galactic baryon physics. In this study, we analyze the dependence of the galactic metal distribution on numerical schemes and quantify the differences in metal mixing among modern galaxy simulation codes (the mesh-based code Enzo and the particle-based codes Gadget-2 and Gizmo-PSPH). In particular, we examine different stellar feedback strengths and an explicit metal diffusion scheme in particle-based codes, as a way to alleviate the well-known discrepancy in metal transport between mesh-based and particle-based simulations. We demonstrate that a sufficient number of gas particles are needed in the gas halo to properly investigate the metal distribution therein. Including an explicit metal diffusion scheme does not significantly affect the metal distribution in the galactic disk but does change the amount of low-metallicity gas in a hot diffuse halo. We also find that the spatial distribution of metals depends strongly on how the stellar feedback is modeled. We demonstrate that the previously reported discrepancy in metals between mesh-based and particle-based simulations can be mitigated with our proposed prescription, enabling these simulations to be reliably utilized in the study of metals in galactic halos and the circumgalactic medium.
Checklist of order Terebrantia (Thysanoptera): generic diversity and species composition in Xishuangbanna, Yunnan province, China
Authors: Ntirenganya Elie , Yajin Li , Yanlan Xie , Yanli Zhou , Hongrui Zhang 
Published: August 2021

Thysanoptera is one of the most predominant order of insects in different ecological zones with worldwide distribution. Due to their small size there is a big gap in their distribution and host range data. To the best of our knowledge there is no investigation on thrips distribu+tion and host range in Xishuangbanna. Currently, a total 566 species in 155 genera are listed in China, of which 313 species represent Terebrantia.
In this study, a list of 115 species representing 54 genera within 2 families (Aeolothripidae & Thripidae) is provided.Two of these, Dichromomothrips nakahari Moud, 1976 (Subfamily: Thripinae) and Phibalothrips rugosus Kudo, 1979 (Subfamily: Panchaetothripinae) are newly recorded in China. Thrips species with their host ranges, habits, and habitats are provided. Our study will contribute to the global biodiversity distribution data-gap of Thysanoptera.
Promouvoir la marque employeur sur les réseaux sociaux professionnels via la communication de recrutement : les bonnes pratiques
Authors: Fueyo Céline 
Published: August 2021

Cette recherche examine la Communication de Recrutement (CR) sur les réseaux sociaux professionnels en tant qu’instrument d’influence pouvant affecter les attitudes et les comportements des employés potentiels à l’égard de la Marque Employeur (ME). En empruntant les théories de l’efficacité publicitaire par une approche marketing RH, une étude qualitative en quatre étapes, réalisée auprès d’employés potentiels, permet de recommander, aux responsables marketing et RH, un référentiel de bonnes pratiques pour concevoir une CR. Plus précisément, les résultats montrent que : 1) la CR est jugée utile par les employés potentiels, 2) la CR binomiale est plus attractive, plus persuasive que la CR partielle, 3) les CR binomiales qui engendrent a) des humeurs positives, b) une forte projection de soi et c) une perception de temps gagné et de risque d’erreur réduit, impactent positivement la perception de la ME et favorisent l’intention d’interagir. Cet article ouvre de nombreuses voies de recherche dans le champ du marketing RH en termes de communication digitale de la ME.
Highly Efficient Renewal of A Hydropower Plant Pipe Coating
Authors: Palatka Petr 
Published: August 2021

Abstract
Many pumped storage hydropower plants have long large diameter steep steel pipes (penstocks) between reservoirs. The coating inside such pipes protects the surface from corrosion. Lifetime of the coating is limited and it has to be renewed several times during expected lifetime of the hydropower plant. The coating renovation was a manual process until now. A modification of the process is proposed. The modification of the process includes changes in the technological steps as well robotization of these steps. The new process provides more stability in the quality of coating and eliminates unnecessary presence of people in confined spaces. Using a robot also makes the renewal of the coating much faster. Therefore, it can bring a lot of profit to the owner by shortening the production downtime and re-starting production significantly earlier in comparison to the existing renovation process.
The new process was verified in a pilot project at a selected pumped storage hydropower plant and the results were evaluated in cooperation with the hydropower plant owner. Laboratory tests of samples have shown that the coating has two times higher adhesion to the substrate in comparison to the manual coating application. The results also showed that the owner can save around 600 days of downtime on each of both penstocks when using this new process. This is a clear economical advantage which each owner of the infrastructure can understand easily.
Fracture Mechanics Assessment of Cracks in Areas of Large Scale Plasticity in Subsea HPHT Equipment
Authors: Kulkarni Mandar , Lopez Carlos , Kluk Daniel , Chappell John 
Published: August 2021

Abstract
Subsea HPHT components may be evaluated utilizing a fracture mechanics-based approach as per guidelines in API RP 17TR8 and ASME Section VIII Division 3. Typically, the assessment is performed based on methods described in API 579-1/ASME FFS-1 and BS7910. The analysis is performed to determine critical flaw sizes and estimate the fatigue life of a growing crack as a means of establishing inspection intervals for the equipment. In most cases, the assessment is based on a linear elastic fracture mechanics approach. The effect of plasticity is generally included via the use of a failure assessment diagram (FAD); however, even with this approach the effect of plastic strain around the crack is not explicitly considered. The assessment standards do not provide clear guidance for cases involving a crack which is located within a region of large-scale plastic strain. For these cases, API 579, Annex 9G.5 recommends utilizing a driving force method whereby the J-integral is directly evaluated from an elastic-plastic finite element model.
This paper presents such an approach. A simplified representative geometry is considered for this study. A region of a stress concentration, such as is typically encountered near an internal radius is considered. Such a region can potentially show localized plasticity. J-integral is calculated by explicitly modeling a series of cracks of increasing depth through this zone of plasticity and the results are compared to the different methodologies described in API 579-1/ASME FFS-1 and BS7910. Cracks are modeled both completely and partially enveloped within the plastic zone.
Results are summarized and compared, highlighting the key differences between different analysis approaches with the aim of identifying the most conservative assessment method for different crack sizes. Additionally, the effect of large-scale plasticity on the crack driving force is determined relative to similar conditions without plasticity. The results indicate that for cracks lying within the regions of localized plasticity, using an API579 Level 2 approach coupled with extracting elastic-plastic through wall stresses from an uncracked geometry may result in significant under prediction of the driving force. Conversely, extracting linear elastic stresses from an uncracked geometry may significantly over predict the driving force and may prove too conservative for determining acceptable crack sizes.
This paper presents a comprehensive comparison of different analysis approaches used for evaluating cracks in subsea equipment. The results indicate that, for HPHT equipment with increased safety implications, a detailed elastic plastic fracture mechanics evaluation of the cracked geometry should be performed for cases in which localized plasticity is expected to occur.
Rational Approach to Assess the Effect of Corrosion on Stiffened Panel Buckling and Ultimate Capacity
Authors: Joshi Nikhil Prakash , Brewer Jonathan Lewis , Rose Christopher John 
Published: August 2021

Abstract
During the annual In-Service Inspection of a spar hull, several regions of pitting corrosion on the upper portion of the north and south moon pool external wall plating were identified. The moon pool walls are constructed as typical stiffened panel structures. Visual, ultrasonic (UT), and pulsed eddy current (PEC) inspections indicated regions of corrosion with roughly 40% to 70% averaged localized wall loss. This paper discusses the analytical assessment of the structure to determine the effect of the corrosion on the structural integrity of the moon pool wall and any similar structural panel.
To determine the impact of corrosion on the stiffened panel integrity, a finite element (FE) based analysis approach is used to perform a comparative assessment of the "as-built" and "corroded" configuration of the moon pool wall. The nominal plate and stiffener thicknesses are modeled in the "as-built" configuration; whereas, the measured plate thickness from the inspection is modeled in the "corroded" configuration. The structure is subjected to design loads based on the storm damaged design condition. The analysis is performed by uniformly increasing the applied loads until failure occurs, maintaining a constant ratio between the nominal loads. Two different analyses are performed as a part of the strength assessment: (1) a linear-elastic eigenvalue analysis to estimate the elastic buckling capacity and mode shapes of the structure and (2) an elastic-plastic post-buckling analysis to estimate the ultimate capacity of the structure. In addition, the results from the linear-elastic eigenvalue analysis are compared to the results from analytical buckling calculations.
The analysis results indicate that the corrosion reduces the elastic plate buckling capacity significantly. However, the overall capacity of the stiffened panel is not significantly reduced. Therefore, from a global strength perspective, the stiffened panel remains acceptable in its corroded condition. The upper portion of the moon pool wall is typically fatigue insensitive in spars. Therefore, the effect of the corrosion wall loss on the fatigue performance was not assessed.
Since there is limited guidance in design and assessment codes for assessing corroded stiffened panels, this approach can be used to address future stiffened panel corrosion wall loss. In addition, this method allows for inclusion of future corrosion allowance, if applicable. Determining the capacity of corroded panels using FEA-based numerical methods, like those described in this paper, allows the operators to manage their risks, repair costs, and inspection frequency by determining the actual capacity of the damaged components. This allows the operators to determine the appropriate mitigation measures based on a quantitative risk calculation.
Qualification of Polymer Materials for Dynamic Riser Service
Authors: McCord Craig , Jones Colin 
Published: August 2021

Abstract
Polymer liners have been used extensively in water injection flowlines for several years, however, have only recently gained traction as a corrosion protection solution for Steel Catenary Risers and other similar rigid pipe risers as the industry moves to more novel systems.
In order to qualify a system for a dynamic service environment such as a riser, it is important to understand the system's fatigue response and characteristics to ensure that all potential failure modes are addressed. This is typically accomplished for rigid pipes via full scale resonance fatigue testing whereby a test specimen is subjected to a representative fatigue environment and point of failure determined.
Rigid pipe specimens with polymer liner installed have been trialed and reported previously. In this programme, the full-scale test strings demonstrated that all the lined system components can withstand the standard fatigue performance test curves. However, it did not confirm the boundary conditions for failure of the polymer liner, as failure of the metallic host pipe always occurred first.
A similar method can be used to test the polymer material in isolation, however given the strain levels involved and the material's inherent fatigue resistance, it was expected that the duration of testing would be impractical. It was therefore necessary to implement a test method that allowed for identification of the polymer boundary conditions within a reasonable time frame, whilst also allowing for comparison with existing fatigue testing.
In order to achieve this, a small-scale fatigue testing programme was setup in line with ISO 18489, whereby pre-notched dumbbell samples would be prepared and tested, firstly at 23°C but also at 0°C and 60°C to not only allow comparison with existing full-scale data, but also allow determination of suitability across the full temperature range expected in service.
Testing results have demonstrated that the polymer's fatigue resistance far exceeds that of the steel pipe, even with the inclusion of pre-initiated cracking in the samples. The testing was able to provide key data on parameters and their influence on the material's fatigue life such as temperature, stress and strain.
Further to this, an additional test programme was setup to evaluate the influence that the vertical orientation of the riser has on the polymer liner system. In this test programme, the interaction force between the steel pipe and polymer liner was assessed to establish the necessary design criteria to ensure that the interaction force always exceeds the vertical self-weight of the liner.
Testing results demonstrated that the steel pipe/liner interaction force exceeded the equivalent self-weight of the liner eliminating potential failure modes associated with creep. As a result, the vertical orientation of the riser does not present a risk to the integrity of the liner system.