bluuebunny/crossref_metadata_2025_split huggingface dataset:
Аппроксимация контура боковой поверхности заготовок при осадке плоскими бойками
Authors: Anishchenko A. S. , Kukhar V. V. , Prysiazhnyi A. H. 
Published: January 2021

Анищенко А. С., Кухарь В. В., Присяжный А. Г. Аппроксимация контура боковой поверхности заготовок при осадке плоскими бойками // Обработка материалов давлением. – 2019. – № 2 (49). - С. 35-40.
Статья предлагает аппроксимировать суперэллипсом Ляме контур боковой поверхности полуфабриката, который деформируется осадкой с помощью плоских деформирующих плит. Контур полуфабриката имеет форму бочки и определяется величинами диаметров бочки, торца и высотой полуфабриката. Суперэллипс имеет коэффициенты аппроксимации. Значения этих коэффициентов позволяют определить вид контура боковой поверхности полуфабриката. Контур является: параболой, если коэффициент немного меньше 2, окружностью, если коэффициент равен 2, и эллипсом, если коэффициент немного больше 2. Статья предлагает новую формулу для определения коэффициентов аппроксимации в суперэллипсе. Формула основана на равенстве объемов исходной заготовки и полуфабриката после деформации. Объем полуфабриката определен методом интегрирования суперэллипса Ляме, который предварительно разложили в ряд Фурье. Формула не требует проведения большого числа измерений точек контура боковой поверхности и включает в себя высоту и диаметр исходной заготовки, высоту и диаметры торца и бочки деформированного полуфабриката. Статья содержит сведения об аппроксимации суперэллипсом боковых контуров свинцовых деформированных полуфабрикатов. Первая серия полуфабрикатов получена из заготовок, которые имеют одинаковые исходные высоту и диаметр, осажены со степенью деформации, равной 0,4, с применением различных смазок и без смазок. Коэффициент трения между заготовкой и деформирующими плоскими плитами, определенный по методике Губкина, равнялся 0,29–0,41. Вторая серия полуфабрикатов была продеформирована без смазки между заготовками и плитами со степенями деформации, равными 0,1-0.5 (шаг изменения степени деформации был равен 0,1). Высота исходных заготовок в 2 раза превышала их диаметр.
Моделирование материала цилиндрической заготовки со сварным швом при обжиме-раздаче
Authors: Puzyr R. G. , Dragobetsky V. V. , Levchenko R. V. , Siraya Yu. B. 
Published: January 2021

Пузырь Р. Г., Драгобецкий В. В., Левченко Р. В., Сирая Ю. Б. Моделирование материала цилиндрической заготовки со сварным швом при обжиме-раздаче // Обработка материалов давлением. – 2019. – № 2 (49). - С. 55-60.
Показано, что раздача концов трубных заготовок сопровождается потерей устойчивости в окружном и осевом направлении, а также локализацией деформаций с последующим разрушением в виде образования продольной трещины, зарождающейся на торце заготовки. Наличие сварного шва усложняет в общем условия деформирования при обжиме-раздаче и приводит к разрушению заготовки по сварному шву. Для предотвращения трещинообразования необходимо ужесточать коэффициенты обжима-раздачи, что неизбежно приводит к увеличению количества переходов, трудоемкости процесса и себестоимости изготовления детали в целом. Вопрос деформирования сварных конструкций вызывает интерес с развитием новых материалов для автомобилестроения, таких как соединения двух или более стальных листов с различными механическими свойствами, толщиной или типом покрытия, которые имеют важное значение для снижения веса, минимизации затрат и сокращения брака. Показано, что деформирование трубной заготовки будет зависеть не только от характеристик пластичности основного металла и металла сварочного шва, что очевидно, но также от соотношения площадей трубной заготовки. Возрастание приведенных модулей пластичности сопровождается упрочнением сварного соединения по сравнению с начальным металлом заготовки, соответственно уменьшение величины секущего модуля в обеих направлениях – понижением прочностных характеристик металла шва. Дальнейший анализ деформирования сварной заготовки необходимо проводить с учетом локальной анизотропии, вызываемой сварочным швом, что даст возможность определить условия устойчивой пластической деформации и создать дополнительное воздействие на ослабленный участок.
Математичне моделювання процесу дресирування відносно тонких листів і смуг з урахуванням реальних температур реалізації процесу
Authors: Kulik T. A. 
Published: January 2021

Кулік Т. О. Математичне моделювання процесу дресирування відносно тонких листів і смуг з урахуванням реальних температур реалізації процесу // Обробка матеріалів тиском. – 2019. – № 2 (49). - С. 71-75.
Метою даної статті є підвищення показників якості відносно тонкого металопрокату, що піддається теплому дресируванню, шляхом уточнення і розширення в обсязі наданої інформації результатів математичного моделювання напружено-деформованого стану і температурних режимів процесу. Уточнено методику розрахунку опору металів і сплавів при їх теплому деформуванні, що забезпечує більш повне і коректне врахування впливу температури. Отримана математична модель теплого дресирування дозволяє врахувати реальний характер розподілів залишкових напружень смуги, що піддається дресируванню, за шириною і, таким чином, прогнозувати один з основних показників якості готового металопрокату. Так, показано що підвищення температур призводить до збільшення рівнів залишкових напруг стиснення в поверхневих шарах. При цьому максимальна інтенсивність зазначених кількісних змін має місце у випадку підведення теплової енергії безпосередньо в осередок деформації через попередньо нагріті робочі валки. Можливість додаткового підвищення рівнів залишкових напружень стиску на поверхні відносно тонких стрічок, листів і смуг робить ефективним використання процесу теплого дресирування у попередньо нагрітих робочих валках не тільки з точки зору зниження енергосилових параметрів, а і з точки зору поліпшення споживчих властивостей заготовок, які використовуються в подальшому при реалізації різних технологічних схем листового штампування.
Incentives and Work Ability on Job Satisfaction through Performance
Authors: Kasrul Kasrul , Ngandoh Ali Murdhani 
Published: January 2021

This type of research used in this study is associative research. The research site is located at PT. Surveyor of Indonesia in Pangkep Region. The sample in this study used the census method in which the entire population was sampled in the study as many as 57 employees. In conducting statistical testing, it uses path analysis. The results showed that the incentives had a positive and significant effect on job satisfaction at PT. Surveyor of Indonesia in Pangkep Region. Work ability has a positive and significant effect on job satisfaction at PT. Surveyor of Indonesia in Pangkep Region.
Incentives have a positive and significant effect on performance at PT. Surveyor of Indonesia in Pangkep Region. Work ability has a positive and significant effect on performance at PT. Surveyor of Indonesia in Pangkep Region. Job satisfaction has a positive and significant effect on performance at PT. Surveyor of Indonesia in Pangkep Region. Incentives have a positive and significant effect on performance through job satisfaction at PT. Surveyor of Indonesia in Pangkep Region. Work ability has a positive and significant effect on performance through job satisfaction at PT. Surveyor of Indonesia in Pangkep Region
THE BLACK AND WHITE OF GOFOOD CO THE BLACK AND WHITE OF GOFOOD CO-BRANDING
Authors: Palguna I Gusti Ngurah Bagus Dwira 
Published: January 2021

Abstract
This research aims to find out how the implementation of Gofood co-branding with its culinary partners, as well as to find out the pros and cons felt by partners since carrying out their co-branding with Gofood. This research is a qualitative research. The focus is on informants’ personal, not specific companies or agencies, understanding. The data collection technique used is in-depth interviews with source triangulation as a data validity technique. The results obtained show that Gofood's co-branding with restaurant partners falls into the same type of co-branding but with different levels of co-branding and value creation. The pros felt by the partners lies in increasing sales, brand awareness and coverage of the sales areas while the thing that is a contra is pricing.

Keywords--- co-branding, third-party online food delivery, business owner experience, Gofood
Analytical Solution of Magnetically Dominated Astrophysical Jets and Winds: Jet Launching, Acceleration, and Collimation
Authors: Chen Liang , Zhang Bing 
Published: January 2021

Abstract
We present an analytical solution of a highly magnetized jet/wind flow. The left side of the general force-free jet/wind equation (the “pulsar” equation) is separated into a rotating and a nonrotating term. The two equations with either term can be solved analytically, and the two solutions match each other very well. Therefore, we obtain a general approximate solution of a magnetically dominated jet/wind, which covers from the nonrelativistic to relativistic regimes, with the drift velocity well matching the cold plasma velocity. The acceleration of a jet includes three stages. (1) The jet flow is located within the Alfvén critical surface (i.e., the light cylinder), has a nonrelativistic speed, and is dominated by toroidal motion. (2) The jet is beyond the Alfvén critical surface where the flow is dominated by poloidal motion and becomes relativistic. The total velocity in these two stages follows the same law vΓ = ΩR. (3) The evolution law is replaced by

, where θ is the half-opening angle of the jet and 0 ≤ ν ≤ 2 is a free parameter determined by the magnetic field configuration. This is because the earlier efficient acceleration finally breaks the causality connection between different parts in the jet, preventing a global solution. The jet has to carry local charges and currents to support an electromagnetic balance. This approximate solution is consistent with known theoretical results and numerical simulations, and it is more convenient to directly compare with observations. This theory may be used to constrain the spin of black holes in astrophysical jets.
An Energy Inventory of Tidal Disruption Events
Authors: Mockler Brenna , Ramirez-Ruiz Enrico 
Published: January 2021

Abstract
Tidal disruption events (TDEs) offer a unique opportunity to study a single supermassive black hole (SMBH) under feeding conditions that change over timescales of days to months. However, the primary mechanism for generating luminosity during the flares remains debated. Despite the increasing number of observed TDEs, it is unclear whether most of the energy in the initial flare comes from accretion near the gravitational radius or from circularizing debris at larger distances from the SMBH. The energy dissipation efficiency increases with decreasing radius; therefore, by measuring the total energy emitted and estimating the efficiency, we can derive clues about the nature of the emission mechanism. Here we calculate the integrated energy, emission timescales, and average efficiencies for the TDEs using the Modular Open Source Fitter for Transients (MOSFiT). Our calculations of the total energy generally yield higher values than previous estimates. This is predominantly because, if the luminosity follows the mass fallback rate, TDEs release a significant fraction of their energy long after their light curve peaks. We use MOSFiT to calculate the conversion efficiency from mass to radiated energy and find that for many of the events, it is similar to efficiencies inferred for active galactic nuclei. There are, however, large systematic uncertainties in the measured efficiency due to model degeneracies between the efficiency and the mass of the disrupted star. These must be reduced before we can definitively resolve the emission mechanism of individual TDEs.
ALMA and IRIS Observations of the Solar Chromosphere. I. An On-disk Type II Spicule
Authors: Chintzoglou Georgios , De Pontieu Bart , Martínez-Sykora Juan , Hansteen Viggo , de la Rodríguez Jaime Cruz , Szydlarski Mikolaj , Jafarzadeh Shahin , Wedemeyer Sven , Bastian Timothy S. , Dalda Alberto Sainz 
Published: January 2021

Abstract
We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph. The observatories targeted a chromospheric plage region of which the spatial distribution (split between strongly and weakly magnetized regions) allowed the study of linear-like structures in isolation, free of contamination from background emission. Using these observations in conjunction with a radiative magnetohydrodynamic 2.5D model covering the upper convection zone all the way to the corona that considers nonequilibrium ionization effects, we report the detection of an on-disk chromospheric spicule with ALMA and confirm its multithermal nature.
Can the Helium-detonation Model Explain the Observed Diversity of Type Ia Supernovae?
Authors: Li Wenxiong , Wang Xiaofeng , Bulla Mattia , Pan Yen-Chen , Wang Lifan , Mo Jun , Zhang Jujia , Wu Chengyuan , Zhang Jicheng , Zhang Tianmeng , Xiang Danfeng , Lin Han , Sai Hanna , Zhang Xinghan , Chen Zhihao , Yan Shengyu 
Published: January 2021

Abstract
We study a sample of 16 Type Ia supernovae (SNe Ia) having both spectroscopic and photometric observations within 2–3 days after the first light. The early B − V colors of such a sample tend to show a continuous distribution. For objects with normal ejecta velocity (NV), the C ii
λ6580 feature is always visible in the early spectra, while it is absent or very weak in the high-velocity (HV) counterpart. Moreover, the velocities of the detached high-velocity features (HVFs) of the Ca II near-IR triplet (CaIR3) above the photosphere are found to be much higher in HV objects than in NV objects, with typical values exceeding 30,000 km s−1 at 2–3 days. We further analyze the relation between the velocity shift of late-time [Fe II] lines (v
[Fe II]) and host galaxy mass. We find that all HV objects have redshifted v
[Fe II], while NV objects have both blue- and redshifted v
[Fe II]. It is interesting to point out that the objects with redshifted v
[Fe II] are all located in massive galaxies, implying that HV and a portion of NV objects may have similar progenitor metallicities and explosion mechanisms. We propose that, with a geometric/projected effect, the He-detonation model may account for the similarity in birthplace environment and the differences seen in some SNe Ia, including B − V colors, C II features, CaIR3 HVFs at early times, and v
[Fe II] in the nebular phase. Nevertheless, some features predicted by He-detonation simulation, such as the rapidly decreasing light curve, deviate from the observations, and some NV objects with blueshifted nebular v
[Fe II] may involve other explosion mechanisms.
Void Galaxies Follow a Distinct Evolutionary Path in the Environmental COntext Catalog
Authors: Florez Jonathan , Berlind Andreas A. , Kannappan Sheila J. , Stark David V. , Eckert Kathleen D. , Calderon Victor F. , Moffett Amanda J. , Campbell Duncan , Sinha Manodeep 
Published: January 2021

Abstract
We measure the environmental dependence, where environment is defined by the distance to the third nearest neighbor, of multiple galaxy properties inside the Environmental COntext (ECO) catalog. We focus primarily on void galaxies, which we define as the 10% of galaxies having the lowest local density. We compare the properties of void and non-void galaxies: baryonic mass, color, fractional stellar mass growth rate (FSMGR), morphology, and gas-to-stellar-mass ratio (estimated from a combination of H i data and photometric gas fractions calibrated with the REsolved Spectroscopy Of a Local VolumE survey). Our void galaxies typically have lower baryonic masses than galaxies in denser environments, and they display the properties expected of a lower mass population: they have more late types, are bluer, have a higher FSMGR, and are more gas-rich. We control for baryonic mass and investigate the extent to which void galaxies are different at fixed mass. Void galaxies are bluer, more gas-rich, and more star-forming at fixed mass than non-void galaxies, which is a possible signature of galaxy assembly bias. Furthermore, we show that these trends persist even at fixed mass and morphology, and we find that voids host a distinct population of early types that are bluer and more star-forming than the typical red and quenched early types. In addition to these empirical observational results, we also present theoretical results from mock catalogs with built-in galaxy assembly bias. We show that a simple matching of galaxy properties to (sub)halo properties, such as mass and age, can recover the observed environmental trends in ECO galaxies.
The Dispersion Measure and Scattering of Fast Radio Bursts: Contributions from the Intergalactic Medium, Foreground Halos, and Hosts
Authors: Zhu Weishan , Feng Long-Long 
Published: January 2021

Abstract
We investigate the dispersion measure (DM) and scattering of fast radio bursts (FRBs) by the intergalactic medium (IGM), foreground halos, and host halos using cosmological hydrodynamical simulation. We find that the median DM caused by foreground halos is around 30% of that caused by the IGM, but it has a much larger variance. The DM induced by hosts deviates from a log-normal distribution but exhibits an extended distribution in the range of

with a median value

. Then we produce mock FRB sources, assuming a uniform distribution in the range

, to consider the propagation effect of IGM, foreground, and host halos on FRB signals simultaneously. The DM distribution of mock sources agrees well with the observation. The fitted DM–redshift relation of the mock sources can provide a rough estimation of the redshifts of observed events with errors

. The distribution of mock sources in the DM scattering time (τ) space can also match the observation, assuming a Kolmogorov turbulence model where the inner and outer scales are 1000 km to 1 au and 0.2–10 pc, respectively. Finally, we estimate the relative importance of these media for DM and τ in our models. The IGM and host halos are the primary and secondary sources for the extragalactic DM (

). Meanwhile, the contribution from foreground halos increases as

increases. The host and foreground halos may be the most important media for scattering. Statistically, the latter may dominate the scattering of events with

.
NuSTAR Observations of Abell 2163: Constraints on Non-thermal Emission
Authors: Rojas Bolivar Randall A. , Wik Daniel R. , Giacintucci Simona , Gastaldello Fabio , Hornstrup Allan , Westergaard Niels-Jorgen , Madejski Grzegorz 
Published: January 2021

Abstract
Since the first non-thermal reports of inverse Compton (IC) emission from the intracluster medium (ICM) of galaxy clusters at hard X-ray energies, we have yet to unambiguously confirm IC emission in observations with newer facilities. RXTE detected IC emission in one of the hottest known clusters, Abell 2163 (A2163), a massive merging cluster with a giant radio halo—the presumed source of relativistic electrons IC scattering CMB photons to X-ray energies. The cluster’s redshift (z ∼ 0.2) allows its thermal and non-thermal radio emission to fit the field of view of the Nuclear Spectroscopic Telescope Array (NuSTAR), permitting a deep observation capable of confirming or ruling out the RXTE report. The IC flux provides constraints on the average magnetic field strength in a cluster. To determine the global diffuse IC emission in A2163, we fit its global NuSTAR spectrum with four models: single- (1T) and two-temperature (2T), 1T+power-law component (T+IC), and multi-temperature+power law (9T+IC). Each represents different characterizations of the thermal ICM emission, with power-law components added to represent IC emission. We find that the 3–30 keV spectrum can be described by purely thermal emission, with a global average temperature of kT = (11.8 ± 0.2) keV. The IC flux is constrained to <4.0 × 10−12 erg s−1 cm−2 using the 1T+IC model and <1.6 × 10−12 erg s−1 cm−2 with the more physical 9T+IC model, both to 90% confidence levels. Combining these limits with 1.4 GHz diffuse radio data from the VLA, we find the average magnetic field strength to be >0.22 μG and >0.35 μG, respectively, providing the strongest constraints on these values in A2163 to date.
The Spectrum and Term Analysis of Singly Ionized Manganese
Authors: Liggins Florence S. , Pickering Juliet C. , Nave Gillian , Ward Jacob W. , Tchang-Brillet W.-Ü L. 
Published: January 2021

Abstract
An extensive analysis of the Mn spectrum was carried out using high-resolution Fourier transform (FT) and grating spectroscopy of Mn–Ne and Mn–Ar hollow cathode discharge sources, over the range 82–5500 nm (1820–121,728 cm−1). Spectral wavelengths for a total of 6019 Mn ii lines have been measured, of which 1345 are obtained through FT spectroscopy. These wavelengths are given to at least an order of magnitude lower uncertainty than previous measurements. These lines were used to identify 6256 Mn ii transitions and improve the values of 505 previously published energy levels with typical uncertainties of a few thousandths of a cm−1, representing an order-of-magnitude reduction in uncertainty. We have verified and improved an additional 57 Mn ii energy levels, previously established through observation of stellar spectra alone, using our FT spectra. In addition, 52 new energy level values have been established. The number of classified lines reported is approximately 50% more than previously published. The new accurate data for 614 energy levels and 6019 lines will allow a more reliable analysis of Mn ii spectral lines in astrophysical spectra.
Retour sur le scandale de Panama
Authors: Mollier Jean-Yves 
Published: January 2021

Considéré comme le plus grand scandale politico-financier que la France ait connu, le scandale de Panama (1892-1893) présente trois caractéristiques majeures : la montée en puissance d’un antisémitisme qui prépare le terrain de l’affaire Dreyfus (1894-1899), celle d’un antiparlementarisme également virulent, et le début d’une perte de confiance de la population envers ses élites. En frappant de discrédit les banques et les journaux qui avaient profité des largesses de la Compagnie universelle du canal de Panama, ainsi que les journalistes et les parlementaires qui avaient accepté de l’argent de l’entreprise, ce scandale ébranlait les institutions républicaines du pays. Véritable séisme dont les répliques se feront encore sentir dans les années 1930, le scandale de Panama demeure une expérience fondamentale en matière de désinformation de l’opinion et de construction d’un récit destiné à ménager les véritables responsables d’un désastre financier et à détourner la colère des épargnants vers des boucs émissaires.
Suicide, conatus et conflictualité chez Spinoza
Authors: Kim Eunju 
Published: January 2021

La doctrine du conatus chez Spinoza est formulée de façon si radicale que le suicide apparaît comme incompréhensible. Cela contraste avec la référence importante aux actes suicidaires dans ses ouvrages. Pour résoudre ce contraste et défendre la compatibilité entre le suicide et le conatus, nous proposons une lecture nouvelle de la proposition 5 de l’Éthique III sur la contrariété. Nous dégageons la complexité de chaque individu, la conflictualité entre ses parties, et enfin le conatus de chacune de ces parties, qui jouit, en fonction des relations avec les choses extérieures, d’une certaine indépendance par rapport au conatus de l’individu dans son ensemble.