bluuebunny/crossref_metadata_2025_split huggingface dataset:
Techno-economic performance of 4-row self-propelled mechanical rice transplanter at farmers field in Bangladesh
Authors: Islam AKMS , Rahman MA , Rahman AKML , Islam MT , Rahman MI 
Published: December 2016

Mechanical transplanting is an emerging technology in Bangladesh agriculture. Deadong DP480 rice transplanter was used to conduct the experiment which is imported from South Korea and China. The performance of this machine needs to be thoroughly investigated in local condition. This experiment was conducted in Boro (2015) season in the farmers field at Gosaidanga in Shailkupa upazila under Jhenaidah district and at Rashidpur in Mithapukur upazila under Rangpur district. Two treatments, i.e. T1 = Hand transplanting (HT) and T2 = Mechanical transplanting (MT) were used in the experiment. The experiment was carried out in randomized complete block design (RCBD) and replicated in six plots in each location. Rice variety BRRI dhan28 was used to conduct the experiment in both locations. Fuel consumption of 4-row walking type mechanical transplanter obtained 5.25 L/ha. The field capacity and field efficiency of rice transplanter obtained 0.11-0.12 ha/hr and 64-70 percent, respectively. Conventional seedbed preparation required 37-55 man-hr/ha whereas 71-77 man-hr/ha required in mat type seedling suitable for mechanical transplanting. Labor requirement in hand and mechanical transplanting ranged from 123-150 and 9.0-10.5 man-hr per hectare which was 19-22 and 1.65-2.00 percent of total labor requirement in rice cultivation, respectively. Number of seedling tray requirement ranged from 215-230 per hectare. Calibration should be done on space and seedling density setting before operation in each plot to get optimum plant spacing and seedling tray requirement. Missing hill obtained 1-2 percent in mechanically transplanted plot. Mechanically transplanted plot showed significantly the higher grain yield (9-14%) than hand transplanted method due to use of infant seedling. The input cost in the form of labor and material was found similar in hand transplanting whereas in mechanical transplanting, labor cost found 12 percent lower than material cost. The cost of growing mat type seedling for mechanical transplanter found 53 percent whereas the cost of raising traditional seedbed found 34 percent of the cost of hand transplanting. Mechanical transplanting reduced 1.8 percent input cost than hand transplanting in crop cultivation. BCR of MT and HT showed 1.18-1.19 and 1.03-1.06, respectively. Mechanical intervention in crop production drastically reduced the labor requirement which can offset the peak labor demand. Mechanical transplanting systems increased yield, improved labor efficiency, ensured timeliness in operation and faster transplanting.Progressive Agriculture 27 (3): 369-382, 2016
REFINED SYSTEM PARAMETERS AND TTV STUDY OF TRANSITING EXOPLANETARY SYSTEM HAT-P-20
Authors: Sun Leilei , Gu Shenghong , Wang Xiaobin , Cameron Andrew Collier , Cao Dongtao , Wang Yibo , Xiang Yue , Hui Ho-Keung , Kwok Chi-Tai , Yeung Bill , Ng Eric , Horta Ferran Grau 
Published: December 2016

ABSTRACT
We report new photometric observations of the transiting exoplanetary system HAT-P-20, obtained using CCD cameras at Yunnan Observatories and Ho Koon Nature Education cum Astronomical Centre, China, from 2010 to 2013, and Observatori Ca l’Ou, Sant Marti Sesgueioles, Spain, from 2013 to 2015. The observed data are corrected for systematic errors according to the coarse de-correlation and SYSREM algorithms, so as to enhance the signal of the transit events. In order to consistently model the star spots and transits of this exoplanetary system, we develop a highly efficient tool STMT based on the analytic models of Mandel & Agol and Montalto et al. The physical parameters of HAT-P-20 are refined by homogeneously analyzing our new data, the radial velocity data, and the earlier photometric data in the literature with the Markov chain Monte Carlo technique. New radii and masses of both host star and planet are larger than those in the discovery paper due to the discrepancy of the radius among K-dwarfs between predicted values by standard stellar models and empirical calibration from observations. Through the analysis of all available mid-transit times calculated with the normal model and spotted model, we conclude that the periodic transit timing variations in these transit events revealed by employing the normal model are probably induced by spot crossing events. From the analysis of the distribution of occulted spots by HAT-P-20b, we constrain the misaligned architecture between the planetary orbit and the spin of the host star.
rHARM: ACCRETION AND EJECTION IN RESISTIVE GR-MHD
Authors: Qian(钱前) Qian , Fendt Christian , Noble Scott , Bugli Matteo 
Published: December 2016

ABSTRACT
Turbulent magnetic diffusivity plays an important role for accretion disks and the launching of disk winds. We have implemented magnetic diffusivity and respective resistivity in the general relativistic MHD code HARM. This paper describes the theoretical background of our implementation, its numerical realization, our numerical tests, and preliminary applications. The test simulations of the new code rHARM are compared to an analytic solution of the diffusion equation and a classical shock tube problem. We have further investigated the evolution of the magnetorotational instability (MRI) in tori around black holes (BHs) for a range of magnetic diffusivities. We find an indication for a critical magnetic diffusivity (for our setup) beyond which no MRI develops in the linear regime and for which accretion of torus material to the BH is delayed. Preliminary simulations of magnetically diffusive thin accretion disks around Schwarzschild BHs that are threaded by a large-scale poloidal magnetic field show the launching of disk winds with mass fluxes of about 50% of the accretion rate. The disk magnetic diffusivity allows for efficient disk accretion that replenishes the mass reservoir of the inner disk area and thus allows for long-term simulations of wind launching for more than 5000 time units.
HYDRODYNAMICAL INTERACTION OF MILDLY RELATIVISTIC EJECTA WITH AN AMBIENT MEDIUM
Authors: Suzuki Akihiro , Maeda Keiichi , Shigeyama Toshikazu 
Published: December 2016

ABSTRACT
The hydrodynamical interaction of spherical ejecta freely expanding at mildly relativistic speeds into an ambient cold medium is studied in semianalytical and numerical ways to investigate how ejecta produced in energetic stellar explosions dissipate their kinetic energy through the interaction with the surrounding medium. We especially focus on the case in which the circumstellar medium (CSM) is well represented by a steady wind at a constant mass-loss rate, having been ejected from the stellar surface prior to the explosion. As a result of the hydrodynamical interaction, the ejecta and CSM are swept by the reverse and forward shocks, leading to the formation of a geometrically thin shell. We present a semianalytical model describing the dynamical evolution of the shell and compare the results with numerical simulations. The shell can give rise to bright emission as it gradually becomes transparent to photons. We develop an emission model for the expected emission from the optically thick shell, in which photons in the shell gradually diffuse out to the interstellar space. Then we investigate the possibility that radiation powered by the hydrodynamical interaction is the origin of an underluminous class of gamma-ray bursts.
THE STRUCTURE OF THE LOCAL HOT BUBBLE
Authors: Liu W. , Chiao M. , Collier M. R. , Cravens T. , Galeazzi M. , Koutroumpa D. , Kuntz K. D. , Lallement R. , Lepri S. T. , McCammon D. , Morgan K. , Porter F. S. , Snowden S. L. , Thomas N. E. , Uprety Y. , Ursino E. , Walsh B. M. 
Published: December 2016

ABSTRACT

Diffuse X-rays from the Local Galaxy (DXL) is a sounding rocket mission designed to quantify and characterize the contribution of Solar Wind Charge eXchange (SWCX) to the Diffuse X-ray Background and study the properties of the Local Hot Bubble (LHB). Based on the results from the DXL mission, we quantified and removed the contribution of SWCX to the diffuse X-ray background measured by the ROSAT All Sky Survey. The “cleaned” maps were used to investigate the physical properties of the LHB. Assuming thermal ionization equilibrium, we measured a highly uniform temperature distributed around kT = 0.097 keV ± 0.013 keV (FWHM) ± 0.006 keV (systematic). We also generated a thermal emission measure map and used it to characterize the three-dimensional (3D) structure of the LHB, which we found to be in good agreement with the structure of the local cavity measured from dust and gas.
EVIDENCE FOR QUASI-ADIABATIC MOTION OF CHARGED PARTICLES IN STRONG CURRENT SHEETS IN THE SOLAR WIND
Authors: Malova H. V. , Popov V. Yu. , Grigorenko E. E. , Petrukovich A. A. , Delcourt D. , Sharma A. S. , Khabarova O. V. , Zelenyi L. M. 
Published: December 2016

ABSTRACT
We investigate quasi-adiabatic dynamics of charged particles in strong current sheets (SCSs) in the solar wind, including the heliospheric current sheet (HCS), both theoretically and observationally. A self-consistent hybrid model of an SCS is developed in which ion dynamics is described at the quasi-adiabatic approximation, while the electrons are assumed to be magnetized, and their motion is described in the guiding center approximation. The model shows that the SCS profile is determined by the relative contribution of two currents: (i) the current supported by demagnetized protons that move along open quasi-adiabatic orbits, and (ii) the electron drift current. The simplest modeled SCS is found to be a multi-layered structure that consists of a thin current sheet embedded into a much thicker analog of a plasma sheet. This result is in good agreement with observations of SCSs at ∼1 au. The analysis of fine structure of different SCSs, including the HCS, shows that an SCS represents a narrow current layer (with a thickness of ∼104 km) embedded into a wider region of about 105 km, independently of the SCS origin. Therefore, multi-scale structuring is very likely an intrinsic feature of SCSs in the solar wind.
THE NANOGRAV NINE-YEAR DATA SET: EXCESS NOISE IN MILLISECOND PULSAR ARRIVAL TIMES
Authors: Lam M. T. , Cordes J. M. , Chatterjee S. , Arzoumanian Z. , Crowter K. , Demorest P. B. , Dolch T. , Ellis J. A , Ferdman R. D. , Fonseca E. , Gonzalez M. E. , Jones G. , Jones M. L. , Levin L. , Madison D. R. , McLaughlin M. A. , Nice D. J. , Pennucci T. T. , Ransom S. M. , Shannon R. M. , Siemens X. , Stairs I. H. , Stovall K. , Swiggum J. K. , Zhu W. W. 
Published: December 2016

ABSTRACT
Gravitational wave (GW) astronomy using a pulsar timing array requires high-quality millisecond pulsars (MSPs), correctable interstellar propagation delays, and high-precision measurements of pulse times of arrival. Here we identify noise in timing residuals that exceeds that predicted for arrival time estimation for MSPs observed by the North American Nanohertz Observatory for Gravitational Waves. We characterize the excess noise using variance and structure function analyses. We find that 26 out of 37 pulsars show inconsistencies with a white-noise-only model based on the short timescale analysis of each pulsar, and we demonstrate that the excess noise has a red power spectrum for 15 pulsars. We also decompose the excess noise into chromatic (radio-frequency-dependent) and achromatic components. Associating the achromatic red-noise component with spin noise and including additional power-spectrum-based estimates from the literature, we estimate a scaling law in terms of spin parameters (frequency and frequency derivative) and data-span length and compare it to the scaling law of Shannon & Cordes. We briefly discuss our results in terms of detection of GWs at nanohertz frequencies.
THE CONCENTRATION DEPENDENCE OF THE GALAXY–HALO CONNECTION: MODELING ASSEMBLY BIAS WITH ABUNDANCE MATCHING
Authors: Lehmann Benjamin V. , Mao Yao-Yuan , Becker Matthew R. , Skillman Samuel W. , Wechsler Risa H. 
Published: December 2016

ABSTRACT
Empirical methods for connecting galaxies to their dark matter halos have become essential for interpreting measurements of the spatial statistics of galaxies. In this work, we present a novel approach for parameterizing the degree of concentration dependence in the abundance matching method. This new parameterization provides a smooth interpolation between two commonly used matching proxies: the peak halo mass and the peak halo maximal circular velocity. This parameterization controls the amount of dependence of galaxy luminosity on halo concentration at a fixed halo mass. Effectively this interpolation scheme enables abundance matching models to have adjustable assembly bias in the resulting galaxy catalogs. With the new

DarkSky Simulation, whose larger volume provides lower sample variance, we further show that low-redshift two-point clustering and satellite fraction measurements from SDSS can already provide a joint constraint on this concentration dependence and the scatter within the abundance matching framework.
TORNADO-LIKE EVOLUTION OF A KINK-UNSTABLE SOLAR PROMINENCE
Authors: Wang Wensi , Liu Rui , Wang Yuming 
Published: December 2016

ABSTRACT
We report on the tornado-like evolution of a quiescent prominence on 2014 November 1. The eastern section of the prominence first rose slowly, transforming into an arch-shaped structure as high as ∼150 Mm above the limb; the arch then writhed moderately in a left-handed sense, while the original dark prominence material emitted in the Fe ix 171 Å passband, and a braided structure appeared at the eastern edge of the warped arch. The unraveling of the braided structure was associated with a transient brightening in the EUV and apparently contributed to the formation of a curtain-like structure (CLS). The CLS consisted of myriad thread-like loops rotating counterclockwise about the vertical if viewed from above. Heated prominence material was observed to slide along these loops and land outside the filament channel. The tornado eventually disintegrated and the remaining material flew along a left-handed helical path constituting approximately a full turn, as corroborated through stereoscopic reconstruction, into the cavity of the stable, western section of the prominence. We suggest that the tornado-like evolution of the prominence was governed by the helical kink instability, and that the CLS formed through magnetic reconnections between the prominence field and the overlying coronal field.
PHYSICAL-CONSTRAINT-PRESERVING CENTRAL DISCONTINUOUS GALERKIN METHODS FOR SPECIAL RELATIVISTIC HYDRODYNAMICS WITH A GENERAL EQUATION OF STATE
Authors: Wu Kailiang , Tang Huazhong 
Published: December 2016

ABSTRACT
The ideal gas equation of state (EOS) with a constant adiabatic index is a poor approximation for most relativistic astrophysical flows, although it is commonly used in relativistic hydrodynamics (RHD). This paper develops high-order accurate, physical-constraints-preserving (PCP), central, discontinuous Galerkin (DG) methods for the one- and two-dimensional special RHD equations with a general EOS. It is built on our theoretical analysis of the admissible states for RHD and the PCP limiting procedure that enforce the admissibility of central DG solutions. The convexity, scaling invariance, orthogonal invariance, and Lax–Friedrichs splitting property of the admissible state set are first proved with the aid of its equivalent form. Then, the high-order central DG methods with the PCP limiting procedure and strong stability-preserving time discretization are proved, to preserve the positivity of the density, pressure, specific internal energy, and the bound of the fluid velocity, maintain high-order accuracy, and be L
1-stable. The accuracy, robustness, and effectiveness of the proposed methods are demonstrated by several 1D and 2D numerical examples involving large Lorentz factor, strong discontinuities, or low density/pressure, etc.
Le masque de mousse et autres récits fantastico-scientifiques des xvii e et xviii e siècles
Authors: Serdeczny Anton 
Published: December 2016

Une fillette au bois dormant sous un masque de mousse, un second Jonas survivant à une immersion de sept semaines, des hirondelles hibernant au fond des lacs : il ne s’agit pas là d’épisodes de contes, mais de cas discutés le plus sérieusement du monde par des savants des xvii e et xviii e siècles. Analysés pour ce qu’ils sont (des mythes naturalisés), on peut en proposer une interprétation historico-anthropologique et saisir le rôle moteur qu’ils eurent dans le déplacement des frontières scientifiques du croyable.
En Grèce, une crise migratoire chronique
Authors: Pillant Laurence 
Published: December 2016

Pays d’émigration jusqu’au début des années 1990, la Grèce est devenue un pays d’immigration avec l’arrivée des migrants albanais après la chute du mur de Berlin. L’arsenal législatif mis en place alors, basé sur l’expulsion et le contrôle aux frontières, ne peut répondre au phénomène migratoire qui émerge dans les années 2000, à savoir une migration de transit. Répression et détention deviennent des modes de gestion des flux migratoires, sous couvert d’une situation d’urgence… qui dure.
Turquie-Europe, à qui la faute ?
Authors: Preiss Nausicaa 
Published: December 2016

Cherchant à tout prix à empêcher l’accès des migrants à son territoire, l’UE s’est engagée dans une coopération avec des États tiers qualifiés pour l’occasion de « pays sûrs » pour qu’ils prennent en charge le contrôle des migrations vers l’Europe. L’accord passé avec la Turquie le 18 mars 2016 s’inscrit dans ce processus d’externalisation. Malgré les graves atteintes aux libertés fondamentales exercées par le régime turc, l’UE continue de voir dans cet accord la solution à privilégier.
1938 : le monde ferme ses portes aux réfugiés
Authors: Lochak Danièle 
Published: December 2016

Des réfugiés qui fuient en masse le nazisme, des gouvernements qui leur barrent l’accès à leur territoire, des exilés contraints d’embarquer clandestinement sur des bateaux de fortune, une diplomatie prête à donner des gages aux pires dictatures et néanmoins impuissante, comme l’atteste l’échec prévisible de la conférence d’Évian en 1938 : les analogies sont décidément troublantes entre l’attitude des États à l’égard des Juifs dans les années 1930 et celle qu’ils adoptent aujourd’hui à l’égard des réfugiés.
Fanon, Shariati et la question de la religion : cinquante ans après
Authors: Shariati Sara 
Published: December 2016

À partir de l’étude des relations et de la correspondance entre Frantz Fanon et Ali Shariati dans les années 1960 à Paris, cet article porte sur la question de la religion. La première partie revient sur la place de la religion dans l’œuvre de Fanon et de Shariati, et sur leur désaccord quant à ses usages dans la lutte nationale. La seconde partie s’intéresse à l’évolution de son rôle au cours des cinquante dernières années, avec notamment le surgissement de ce qu’on appelle le fondamentalisme religieux. Ce qui pose de nouvelles questions. Fanon a-t-il sous-estimé le rôle de la religion ? N’a-t-il pas pensé au réveil de la religion colonisée ? Le projet de réforme religieuse, souhaité par Shariati, a-t-il échoué dans les pays musulmans ?
1956 et alentours. Frantz Fanon et le corps-à-corps avec les cultures
Authors: Taliani Simona 
Published: December 2016

En 1956, Fanon met fin à sa mission en Algérie. Sa conscience était devenue le « siège de débats impardonnables » puisque, comme il l’écrivait dans sa lettre de démission, « les bases doctrinales [de la psychiatrie] s’opposaient quotidiennement à une perspective humaine authentique ». Cet article revient sur l’ambivalence de Fanon à propos de la posture ethnopsychiatrique de son temps. Je suggère que ses écrits concernant le rôle des cultures dans l’atmosphère thérapeutique sont tout sauf cohérents, parce qu’ils sont irrémédiablement le fruit d’une époque fascinée par la maladie mentale des peuples colonisés mais également contradictoire, marquée par un foisonnement de théories pseudo-scientifiques et la violence exacerbée de la société coloniale. Son mode de raisonnement dans le domaine de la cure est néanmoins essentiel, parce qu’il nous force à laisser de côté toute tentative de vulgariser les cultures et à repenser la relation entre aliénation et altérité.
Relire Fanon
Authors: Bayart Jean-François 
Published: December 2016

Relire Fanon revient à le replacer dans son temps et sa position de psychiatre en situation coloniale, lui-même issu de l’empire en sa qualité de Martiniquais, et engagé dans le renversement de celui-ci au nom d’un universalisme révolutionnaire. Son œuvre demeure stimulante en ce qu’elle récuse toute interprétation culturaliste et identitaire du politique, comprend le rôle de la guerre dans le changement social, saisit l’importance de la culture matérielle et de ses techniques du corps, identifie le compromis entre « élites colonisées » et « bourgeoisie métropolitaine » sous-jacent à la colonisation et à la décolonisation. En revanche, Fanon ne se départit pas d’une appréhension essentialiste et anhistorique de la situation coloniale, ainsi que d’une vision assez pauvre de la subalternité sociale.
Masque indien, identité noire : l’usage politique des rituels afro-indiens par la classe ouvrière afro-américaine de La Nouvelle-Orléans
Authors: Godet Aurélie 
Published: December 2016

Cet article se propose d’étudier l’héritage du binarisme racial à La Nouvelle-Orléans au travers des parades festives des Mardi Gras Indians, rituel folklorique spécifique à la ville, même si on en trouve des échos dans l’aire caraïbe et sud-américaine. Prenant acte de la longue histoire du « playing Indian » (Philip Deloria) aux États-Unis, il envisage dans un premier temps les processions organisées par ces tribus fictives d’« Indiens noirs » comme une porte dérobée vers un ailleurs racial, comme l’« invention d’une tradition » (Eric Hobsbawm) et comme l’exercice du « droit à être un autre » (Mikhaïl Bakhtine). Ces mêmes défilés, ainsi que les six à neuf mois de préparatifs qui les précèdent, sont ensuite réinterprétés comme l’expression « infra-politique » (James C. Scott) d’une identité noire conquérante et autonome, qui se rit des règles instaurées par l’élite politique et économique blanche de La Nouvelle-Orléans dans le but de canaliser l’esprit festif et marginaliser les pratiques culturelles populaires afro-américaines. Enfin, cet article revient sur la trêve conclue en 2011 entre la municipalité blanche de La Nouvelle-Orléans et les Mardi Gras Indians afin d’en démêler les implications en termes de relations de pouvoir depuis le passage de l’ouragan Katrina.
L’exténuation de la querelle de la grâce au miroir de la Somme de Théologie
Authors: De Franceschi Sylvio Hermann 
Published: December 2016

Publié pour la première fois à Liège de 1746 à 1741, le Cursus theologiae du dominicain Charles-René Billuart (1685-1757) a progressivement acquis au xix	e siècle rang de classique français de la théologie thomiste, notamment grâce à trois grandes rééditions, l’édition Méquignon (1827-1831), l’édition Albanel et Martin (1839) et, surtout, l’édition Lequette (1867-1868). En rééditant le Cursus theologiae du P. Billuart, le libraire Méquignon a proposé certes au public un manuel de théologie qui était un commentaire pédagogique de la Somme de saint Thomas, mais il a réintroduit aussi dans le champ théologique français de l’âge romantique des éléments polémiques fortement datés et dont l’intérêt avait pu paraître s’être progressivement évaporé. De sa première édition jusqu’à la fin du xix	e siècle, le maître ouvrage de Billuart a accompagné, en nourrissant le débat entre thomistes et molinistes, le long processus d’exténuation de la querelle catholique de la grâce.