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نیمه شمالی استان خوزستان قسمتی از مناطق خشک و نیمه خشک کشور ایران به شمار می آید که به دلیل این ویژگی دائماً تحت تأثیر نوسانات کوچک و بزرگ نزولات جوی می باشد. لذا برآورد و پایش شاخص های مطمئن خشکسالی می تواند در شناخت بیشتر آسیب ها و زیانهای خشکسالی و برنامه ریزی برای آینده منطقه مفید واقع گردد. در این پژوهش از یک سری داده های ماهواره ای و یک سری داده های بارش ماهیانه ایستگاهی استفاده شده است...
We study the Severi variety Vd,g of plane curves of degree d and geometric genus g. Corresponding to every such variety, there is a one-parameter family of genus g stable curves whose numerical invariants we compute. Building on the work of Caporaso and Harris, we derive a recursive formula for the degrees of the Hodge bundle on the families in question. For d large enough, these families induc...
Konstantinos K. Tsilidis*, Ruth C. Travis, Paul N. Appleby, Naomi E. Allen, Sara Lindstrom, Fredrick R. Schumacher, David Cox, Ann W. Hsing, Jing Ma, Gianluca Severi, Demetrius Albanes, Jarmo Virtamo, Heiner Boeing, H. Bas Bueno-de-Mesquita, Mattias Johansson, J. Ramón Quirós, Elio Riboli, Afshan Siddiq, Anne Tjønneland, Dimitrios Trichopoulos, Rosario Tumino, J. Michael Gaziano, Edward Giovann...
We discuss natural connections between three objects: quadratic forms with values in line bundles, conic bundles and quaternion orders. We use the even Clifford algebra, and the Brauer-Severi Variety, and other constructions to give natural bijections between these objects under appropriate hypothesis. We then restrict to a surface base and we express the second Chern class of the order in term...
This article works with theory of ritual in order to begin addressing a series of questions raised by Brazilian spirit possession rituals (in Kardecism and Umbanda). Four contributions to theory of ritual highlight relevant conceptual issues: Humphrey and Laidlaw on non-intentionality; Bloch on deference; Houseman and Severi on social relations; and Kapferer on virtuality. Strawson’s philosophi...
Given a set K in a Banach space X, we define: the tangent set, and the quasi-tangent set to K at ξ ∈ K, concepts more general than the one of tangent vector introduced by Bouligand (1930) and Severi (1931). Both notions prove very suitable in the study of viability problems referring to differential inclusions. Namely, we establish several new necessary, and even necessary and sufficient condit...
In general, not much is known about the arithmetic of K3 surfaces. Once the geometric Picard number, which is the rank of the Néron-Severi group over an algebraic closure of the base field, is high enough, more structure is known and more can be said. However, until recently not a single K3 surface was known to have geometric Picard number one. We give explicit examples of such surfaces over th...
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