bluuebunny/crossref_metadata_2025_split huggingface dataset:
Les poissons du bassin de la rivière Ulindi, à l’Est de la République Démocratique du Congo : revue de la littérature
Authors: Okito Gabriel Mukabo , Matunguru Joseph Masirika , Heri Muzungu Leblanc , Duni Papy Lubunga , Sindayihebura Anicet , Sibomana Claver , Muderhwa Venant Nshombo , Micha Jean-Claude , Ntakimazi Gaspard 
Published: February 2021

Cette revue de la littérature sur les poissons du bassin hydrographique de la rivière Ulindi à l’Est de la République Démocratique du Congo a été réalisée dans le but d’avoir une idée sur l’état des connaissances actuelles de son ichtyofaune en vue de définir les orientations pour leurs études ultérieures dans cette région non encore prospectée en profondeur et dont la plupart des rivières se trouvent actuellement menacées par des activités anthropiques. Cette étude présente une vue globale des rivières du Bassin de la rivière Ulindi avec une liste systématique non exhaustive d’environ 31 espèces de poissons appartenant à 17 genres, 9 Familles et 4 ordres, basée sur la méta-analyse des différentes études taxonomiques de l’ichtyofaune du Bassin de la Rivière Ulindi, réalisées depuis l’époque coloniale du Congo-Belge jusqu’en 2019. Les résultats de cette étude constituent une aide-mémoire pour les services publics en charge de la gestion de l’environnement dans la gestion de la biodiversité ichtyologique de cet écosystème à intérêt socio-économique considérable dans la région, d’une part et une liste de contrôle aux scientifiques pour des études ultérieures.Mots clés : Ichtyofaune, Ulindi, République Démocratique du Congo, revue de la littérature, liste de contrôle.

English Title: Fishes from the Ulindi river basin, East of the Democratic Republic of Congo: review of the literatureThis review of the literature on fish in the Ulindi river basin in the east of the Democratic Republic of Congo was carried out with the aim of gaining an idea of the state of current knowledge of its fish fauna in order to define guidelines for their further studies in this region not yet explored in depth and most of the rivers of which are currently threatened by anthropogenic activities. This study presents a global view of the rivers of the Ulindi river basin with a non-exhaustive systematic list of approximately 31 fish species belonging to 17 genera, 9 Families and 4 orders, based on the meta-analysis of the various taxonomic studies of the ichtyofauna of the Ulindi river basin, carried out since the colonial times of the Belgian Congo until 2019. The results of this study constitute a baseline for the public services in charge of environmental management in the management of the ichthyological biodiversity of this ecosystem with considerable socio-economic interest in the region, on the one hand and a checklist to scientists for further studies.Keywords: Ichtyofauna, Ulindi, Democratic Republic of Congo, literature review, checklist.
Retrospective evaluation of surgical outcomes after closure of durotomy in eight dogs affected by spinal subarachnoid diverticulum
Authors: Spinillo Simone , Golini Lorenzo , Mariscoli Massimo , Motta Luca 
Published: February 2021

Background: Canine spinal subarachnoid diverticulum has been studied since 1968 and a few advancements have been made with regard to the treatment of this disease. Several surgical techniques have been proposed which include durectomy, fenestration, and/or marsupilization with the latter two regarded as the more favorable surgical treatments. Aim: In this retrospective study, we evaluated the closure of the durotomy incision in the treatment of canine spinal subarachnoid diverticulum. Methods: We retrospectively evaluated eight dogs with clinical signs and magnetic resonance imaging findings consistent with spinal subarachnoid diverticulum located in the cervical and thoracolumbar area. This was to determine whether the fenestration with closure of durotomy was superior to the marsupialization technique. In all dogs, fenestration and removal of subarachnoid adherences alongside closure of the durotomy were carried out. Results: Mild post-operative deterioration was observed in all dogs. Follow-up from 7 to 36 months indicated a satisfactory outcome. Conclusion: We conclude that the closure of durotomy has similar short-term and long-term outcomes compared to the previous reported studies. These results suggest that the closure of durotomy is a viable technique for spinal subarachnoid diverticulum.
Some remarks on regular foliations with numerically trivial canonical class
Authors: Druel Stéphane 
Published: February 2021

In this article, we first describe codimension two regular foliations with numerically trivial canonical class on complex projective manifolds whose canonical class is not numerically effective. Building on a recent algebraicity criterion for leaves of algebraic foliations, we then address regular foliations of small rank with numerically trivial canonical class on complex projective manifolds whose canonical class is pseudo-effective. Finally, we confirm the generalized Bondal conjecture formulated by Beauville in some special cases.Comment: 20 pages
Syzygies of Prym and paracanonical curves of genus 8
Authors: Colombo Elisabetta , Farkas Gavril , Verra Alessandro , Voisin Claire 
Published: February 2021

By analogy with Green's Conjecture on syzygies of canonical curves, the Prym-Green conjecture predicts that the resolution of a general level p paracanonical curve of genus g is natural. The Prym-Green Conjecture is known to hold in odd genus for almost all levels. Probabilistic arguments strongly suggested that the conjecture might fail for level 2 and genus 8 or 16. In this paper, we present three geometric proofs of the surprising failure of the Prym-Green Conjecture in genus 8, hoping that the methods introduced here will shed light on all the exceptions to the Prym-Green Conjecture for genera with high divisibility by 2.Comment: 23 pages; to appear in EPIGA Vol 1, paper no. 7
Prime Fano threefolds of genus 12 with a $G_m$-action
Authors: Kuznetsov Alexander , Prokhorov Yuri 
Published: February 2021

We give an explicit construction of prime Fano threefolds of genus 12 with a $G_m$-action, describe their isomorphism classes and automorphism groups.Comment: 14 pages, LaTeX, updated version, to appear in \'Epijournal de G\'eom\'etrie Alg\'ebrique, Vol. 2 (2018), Article Nr. 3
The parabolic exotic t-structure
Authors: Achar Pramod N , Cooney Nicholas , Riche Simon N. 
Published: February 2021

Let G be a connected reductive algebraic group over an algebraically closed field k, with simply connected derived subgroup. The exotic t-structure on the cotangent bundle of its flag variety T^*(G/B), originally introduced by Bezrukavnikov, has been a key tool for a number of major results in geometric representation theory, including the proof of the graded Finkelberg-Mirkovic conjecture. In this paper, we study (under mild technical assumptions) an analogous t-structure on the cotangent bundle of a partial flag variety T^*(G/P). As an application, we prove a parabolic analogue of the Arkhipov-Bezrukavnikov-Ginzburg equivalence. When the characteristic of k is larger than the Coxeter number, we deduce an analogue of the graded Finkelberg-Mirkovic conjecture for some singular blocks.Soit G un groupe algébrique réductif connexe sur un corps k algébriquement clos. La t-structure exotique sur le fibré cotangent de sa variété de drapeaux T^*(G/B), introduite à l'origine par Bezrukavnikov, a été un outil clé pour de nombreux résultats majeurs en théorie géométrique des représentations, en particulier la démonstration de la conjecture de Finkelberg-Mirkovic graduée. Dans cet article, nous étudions (sous de légères hypothèses techniques) une t-structure analogue sur le fibré cotangent de la variété de drapeaux partiels T^*(G/P). Comme application, nous prouvons un analogue parabolique de l'équivalence de Arkhipov-Bezrukavnikov-Ginzburg. Lorsque la caractéristique de k est supérieure au nombre de Coxeter, nous déduisons un analogue de la conjecture de Finkelberg-Mirkovic graduée pour certains blocs singuliers.
Q_l-cohomology projective planes and singular Enriques surfaces in characteristic two
Authors: Schütt Matthias 
Published: February 2021

We classify singular Enriques surfaces in characteristic two supporting a rank nine configuration of smooth rational curves. They come in one-dimensional families defined over the prime field, paralleling the situation in other characteristics, but featuring novel aspects. Contracting the given rational curves, one can derive algebraic surfaces with isolated ADE-singularities and trivial canonical bundle whose Q_l-cohomology equals that of a projective plane. Similar existence results are developed for classical Enriques surfaces. We also work out an application to integral models of Enriques surfaces (and K3 surfaces).Comment: 24 pages; v3: journal version, correcting 20 root types to 19 and ruling out the remaining type 4A_2+A_1 (in new section 11)
Chern classes of automorphic vector bundles, II
Authors: Esnault Hélène , Harris Michael 
Published: February 2021

We prove that the $\ell$-adic Chern classes of canonical extensions of automorphic vector bundles, over toroidal compactifications of Shimura varieties of Hodge type over $\bar{ \mathbb{Q}}_p$, descend to classes in the $\ell$-adic cohomology of the minimal compactifications. These are invariant under the Galois group of the $p$-adic field above which the variety and the bundle are defined.Comment: 28 pages
Infinite families of inequivalent real circle actions on affine four-space
Authors: Moser-Jauslin Lucy 
Published: February 2021

The main result of this article is to construct infinite families of non-equivalent equivariant real forms of linear C*-actions on affine four-space. We consider the real form of $\mathbb{C}^*$ whose fixed point is a circle. In [F-MJ] one example of a non-linearizable circle action was constructed. Here, this result is generalized by developing a new approach which allows us to compare different real forms. The constructions of these forms are based on the structure of equivariant $\mathrm{O}_2(\mathbb{C})$-vector bundles.Le résultat principal de cet article est de construire des familles infinies de formes réelles équivariantes, non équivalentes entre elles, d’actions linéaires de $\mathbb{C}^*$ sur l’espace affine de dimension 4. L’article [F-MJ] construisait un exemple d’action du cercle non linéarisable. Ici nous généralisons ce résultat en développant une nouvelle approche qui nous permet de comparer les différentes formes réelles. Les constructions de ces formes réelles s’appuient sur la structure de $\mathrm{O}_2(\mathbb{C})$-fibrés vectoriels équivariants.
Hyperelliptic classes are rigid and extremal in genus two
Authors: Blankers Vance 
Published: February 2021

We show that the class of the locus of hyperelliptic curves with $\ell$ marked Weierstrass points, $m$ marked conjugate pairs of points, and $n$ free marked points is rigid and extremal in the cone of effective codimension-($\ell + m$) classes on $\overline{\mathcal{M}}_{2,\ell+2m+n}$. This generalizes work of Chen and Tarasca and establishes an infinite family of rigid and extremal classes in arbitrarily-high codimension.Comment: Published version
Sur l'existence du sch\'ema en groupes fondametal
Authors: Antei Marco , Emsalem Michel , Gasbarri Carlo 
Published: February 2021

Let $S$ be a Dedekind scheme, $X$ a connected $S$-scheme locally of finite type and $x\in X(S)$ a section. The aim of the present paper is to establish the existence of the fundamental group scheme of $X$, when $X$ has reduced fibers or when $X$ is normal. We also prove the existence of a group scheme, that we will call the quasi-finite fundamental group scheme of $X$ at $x$, which classifies all the quasi-finite torsors over $X$, pointed over $x$. We define Galois torsors, which play in this context a role similar to the one of Galois covers in the theory of \'etale fundamental group.Comment: in French. Final version (finally!)
Finiteness of cohomology groups of stacks of shtukas as modules over Hecke algebras, and applications
Authors: Xue Cong 
Published: February 2021

In this paper we prove that the cohomology groups with compact support of stacks of shtukas are modules of finite type over a Hecke algebra. As an application, we extend the construction of excursion operators, defined by V. Lafforgue on the space of cuspidal automorphic forms, to the space of automorphic forms with compact support. This gives the Langlands parametrization for some quotient spaces of the latter, which is compatible with the constant term morphism.Comment: published version
Zero cycles on the moduli space of curves
Authors: Pandharipande Rahul , Schmitt Johannes 
Published: February 2021

While the Chow groups of 0-dimensional cycles on the moduli spaces of Deligne-Mumford stable pointed curves can be very complicated, the span of the 0-dimensional tautological cycles is always of rank 1. The question of whether a given moduli point [C,p_1,...,p_n] determines a tautological 0-cycle is subtle. Our main results address the question for curves on rational and K3 surfaces. If C is a nonsingular curve on a nonsingular rational surface of positive degree with respect to the anticanonical class, we prove [C,p_1,...,p_n] is tautological if the number of markings does not exceed the virtual dimension in Gromov-Witten theory of the moduli space of stable maps. If C is a nonsingular curve on a K3 surface, we prove [C,p_1,...,p_n] is tautological if the number of markings does not exceed the genus of C and every marking is a Beauville-Voisin point. The latter result provides a connection between the rank 1 tautological 0-cycles on the moduli of curves and the rank 1 tautological 0-cycles on K3 surfaces. Several further results related to tautological 0-cycles on the moduli spaces of curves are proven. Many open questions concerning the moduli points of curves on other surfaces (Abelian, Enriques, general type) are discussed.Comment: Published version
Remarks on the positivity of the cotangent bundle of a K3 surface
Authors: Gounelas Frank , Ottem John Christian 
Published: February 2021

Using recent results of Bayer-Macr\`i, we compute in many cases the pseudoeffective and nef cones of the projectivised cotangent bundle of a smooth projective K3 surface. We then use these results to construct explicit families of smooth curves on which the restriction of the cotangent bundle is not semistable (and hence not nef). In particular, this leads to a counterexample to a question of Campana-Peternell.Comment: Published version
Le probl\`eme de la sch\'ematisation de Grothendieck revisit\'e
Authors: Toën Bertrand 
Published: February 2021

The objective of this work is to reconsider the schematization problem of [6], with a particular focus on the global case over Z. For this, we prove the conjecture [Conj. 2.3.6][15] which gives a formula for the homotopy groups of the schematization of a simply connected homotopy type. We deduce from this several results on the behaviour of the schematization functor, which we propose as a solution to the schematization problem.Comment: 21 pages, french
The maximal unipotent finite quotient, unusual torsion in Fano threefolds, and exceptional Enriques surfaces
Authors: Fanelli Andrea , Schröer Stefan 
Published: February 2021

We introduce and study the maximal unipotent finite quotient for algebraic group schemes in positive characteristics. Applied to Picard schemes, this quotient encodes unusual torsion. We construct integral Fano threefolds where such unusual torsion actually appears. The existence of such threefolds is surprising, because the torsion vanishes for del Pezzo surfaces. Our construction relies on the theory of exceptional Enriques surfaces, as developed by Ekedahl and Shepherd-Barron.Comment: 29 pages; minor changes
Blended Learning Kegiatan Kajian dan Praktik Lapangan Mahasiswa di SMK
Authors: Dewayani Mifta , Susman Yongen 
Published: February 2021

Tujuan dari pelaksanaan Kajian dan Praktik Lapangan (KPL) adalah melatih kemampuan mahasiswa dalam mengajar yang secara langsung terjun di ruang lingkup pendidikan sesuai dengan program studi masing-masing. Model yang digunakan dalam pembelajaran menggunakan model Blended Learning , yaitu menggabungkan pembelajaran secara tatap muka dan daring. Kendala yang dialami antara lain sulitnya melakukan pengawasan kepada siswa saat pembelajaran daring dan kurangnya alokasi waktu yang diberikan pada saat pembelajaran tatap muka dilakukan, mengingat pembelajaran dilakukan saat adanya pandemi Covid-19. Kesim­pulan yang dapat ditarik adalah KPL berjalan dapat berjalan dengan baik dan dapat memberikan pengalaman kepada mahasiswa dalam menjalan­kan peran menjadi guru, sehingga mahasiswa dapat belajar mengatasi per­masalahan yang dihadapi selama memberikan pelajaran
Pengembangan Bahan Ajar Data Mining Menggunakan Four-D Model dalam Kerangka Kerja CDIO
Authors: Saputra Nurroby Wahyu , Wibawa Aji Prasetya , Pujianto Utomo , Anugrah Prananda 
Published: February 2021

Penelitian ini bertujuan untuk menganalisis, merancang dan mengembangkan, serta menyebarluaskan bahan ajar yang sesuai dengan mata kuliah data mining. Metode yang digunakan adalah Research and Development. Dengan menggunakan model pengembangan 4D (four-D model) dengan tahapan Define, Design, Develop, Disseminate yang di­anggap mampu mancapai tujuan tersebut. Sementara dalam pengemba­ngan bahan ajar ini, metode pembelajaran yang digunakan adalah CDIO. Dengan model pembelajaran ini diharapkan mahasiswa lebih memahami materi yang disampaikan serta kecakapan yang sesuai dengan dunia kerja. Dalam penelitian pengembangan ini produk telah dirancang dan dikem­bang­kan hingga mendapat nilai presentase validasi sebesar 85,375% se­hingga produk ini dikategorikan sangat layak dan dapat disebarluaskan
Pengembangan Kawasan Wisata Bahari Tanjung Kelayang Dengan Pendekatan Recreational Opportunity Spectrum
Authors: Budi Wahyuni Retno 
Published: February 2021

ROS is a framework for identifying places of interest. In ROS there are three criteria that are the parameters of experience, environment, location and examples of activities. The measurements of the ROS parameters yield 5 classes ranging from Easily Accessible to Remote Area. . The problem found was tourism marine activities from diving, snorkeling and intentional fishing affecting the quality and the ecosystem existence.
This study will review the recreational zone which is not contrary to the principles of marine area management. It is expected that the identification of zoning in the form of marine tourism spectrum classes beside tourism activitie plan using parameters in ROS will make the â€‹â€‹Tanjung Kelayang area becoming a tourist area not only attracts tourists but also becoming more sustainable.

This research uses a descriptive method with qualitative approach (1) describes the potential of Tanjung Kelayang marine tourism area based on Main Attraction, Depth and Air, Latitude and Access. Then after that (2) an analysis with ROS resulted in the classification of ROS Tanjung Kelayang class. Next (3) The ROS classification results will be drawn in the form of GIS with the help of Arc application. GIS and Arc. Map. Based on the results of the study, it was found that Tanjung Kelayang area was included in class 1 or was easily accessible, quite affordable and comfortable, and the quality of DTW was comfortable and well
IMPACT OF ANIMATED CARTOONS ON CHILDREN AGED SEVEN TO ELEVEN YEARS IN NAIROBI, KENYA
Authors: Kidenda Mary Claire Akinyi 
Published: February 2021

Purpose: The purpose of this study was to investigate the impact of animated cartoons on children aged seven to eleven years in Nairobi County, Kenya.Methodology: The study used descriptive survey method to collect information through casual interviews and self-administered questionnaires.Results: The study found that children watch animated cartoons because they are funny, enjoyable and are interesting i.e. because of entertainment. The study also found out that animated cartoons and TV in general can lead to lack of communication between parents and children in the home. Children are also likely to develop the language and social skills exhibited by the animated cartoon characters. This study also revealed that children watch animated cartoons with minimal parental guidance. The study concluded that media has the power to profoundly shape perceptions of the social world and to manipulate actions in subtle but highly effective ways. Animated cartoons have an impact on the children in respect to viewer ship patterns, the views they hold about animated cartoons and how they rate them; acquired language, dressing and sexuality, violence and role types. Unique contribution to theory, practice and policy: The study suggests that parents need to develop guidelines for children on how much animated cartoons they can watch. They should develop the proper perspective concerning their children and be good role models. Parents should take interest in combating hyper sexuality in animated cartoon and allow the children to stay young. Media Practitioners should embrace the development of home-grown animated cartoons, air on Kenyan stations animated cartoons that have local animated imagery designed to relate to the child’s world or context and provide entertainment programming in which life’s problems are not simply and quickly solved with either violent actions or hostile humor. They should air animated cartoons that have no violence or bad morals but are still popular with children. The Government also need to set policies governing the content in animated cartoons aired by the media houses and offer support and facilitate local research initiatives and production, especially on animated cartoons for the African children, with elements that promote our African culture.
Análisis de las competencias en emprendimiento de los emprendedores agrarios españoles
Authors: Conchado Peiró Andrea , Ferrándiz Julia , García Gabriel 
Published: February 2021

La educación y formación son factores esenciales en el aprendizaje de competencias en emprendimiento. Sin embargo, los estudios precedentes no abordan en profundidad la cuestión de cómo formar a los estudiantes en competencias de emprendimiento en el campo de la agricultura. El objetivo de este trabajo es examinar los factores facilitadores del emprendimiento agrario en el ámbito español, en especial aquellos relacionados con la educación y formación a nivel individual. Para ello, se analizaron las respuestas de 170 emprendedores agrarios, 3.393 emprendedores en otros sectores y 67.937 no emprendedores. Los datos fueron recogidos como parte del procedimiento de trabajo del proyecto Global Entrepreneurship Monitor entre 2012 y 2014. Este trabajo tiene importantes implicaciones como aportación al conocimiento sobre las necesidades de formación de los emprendedores agrarios.
Experience with synchronous and asynchronous tools in online teaching: Application to Thermal Renewable Energies of the Degree in Energy Engineering at UPV due to the pandemic produced by COVID-19
Authors: Vargas-Salgado Carlos , Bastida-Molina Paula , Alcazar-Ortega Manuel , Montuori Lina 
Published: February 2021

Due to the pandemic provoked by COVID-19 in March 2020, the Polytechnic University of Valencia (UPV), following the Government's guidelines, changed the modality of the formal lectures from face-to-face to online non-face-to-face teaching. Professors and students had the challenge of adapting to the new model in one week to finish the semester. In this paper, the results of applying online teaching using both: synchronous and asynchronous lectures and the comparison with the traditional course are shown. The synchronous tools used were MS Teams and skype. Among the asynchronous tools used to create the screencast videos are PoliformaT (Own tool created by UPV), MS Powerpoint, MSRecorder and ODB. The platforms used to upload and public the produced videos are media UPV and YouTube. Also, professors use PoliformaT to create exams and task and to send messages and students to send works, carry out exams and access to the information shared by professors.