Revistas académicas de la Universidad Católica del Norte
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Aproximaciones conceptuales y metodológicas a la problemática de las drogas
Get PDFEn la actualidad, todo lector de temas relacionados con psicología y/o medicina se encuentra frecuentemente con el término drogas. La literatura científica, y aquella más ligada al público en general, nos brinda constante información acerca de cómo prevenir e incluso eliminar el consumo de drogas, sea a través de fármacos o empleando diversas técnicas psicoterapeuticas. El libro Drogas. Conceptos, miradas y experiencias, surge en un contexto en donde se pone de manifiesto “la existencia de una dificultad inherente a la búsqueda de una definición única o totalizadora de lo que las drogas son” (p. 9). De manera general el libro busca en los lectores “favorecer el ejercicio crítico al que es, probablemente, uno de los temas más regulares en la sociedad histórica y actual” (p.10). Se puede visualizar que el libro presenta un análisis de diversos conceptos relacionados con el tema de drogas como la normatividad y tratamiento y su asociación con las emociones, el género y el uso de otras sustancias
Non-linear maps preserving singular algebraic operators
No full textLet B(H) be the algebra of all bounded linear operators on an infinite-dimensional Hilbert space H. We prove that if Φ is a surjective map on B(H) such that Φ(I) = I + Φ(0) and for every pair T, S ∈ B(H), the operator T — S is singular algebraic if and only if Φ(T) — Φ(S) is singular algebraic, then Φ is either of the form Φ(T) = ATA-1 + Φ(0) or the form Φ(T) = AT*A-1 + Φ(0) where A : H → H is an invertible bounded linear, or conjugate linear, operator
Parametric Estimation and the CIR Model
No full textWe study parametric estimation in the Cox-Ingersoll-Ross model and establish the stochastic differential equations for the parameters involved in it
The upper open monophonic number of a graph
No full textFor a connected graph G of order n,a subset S of vertices of G is a monophonic set of G if each vertex v in G lies on a x-y monophonic path for some elements x and y in S. The minimum cardinality of a monophonic set of G is defined as the monophonic number of G, denoted by m(G). A monophonic set of cardinality m(G) is called a m-set of G.A set S of vertices of a connected graph G is an open monophonic set of G if for each vertex v in G ,either v is an extreme vertex of G and v G S,or v is an internal vertex of a x-y mono-phonic path for some x,y G S. An open monophonic set of minimum cardinality is a minimum open monophonic set and this cardinality is the open monophonic number, om(G). An open monophonic set S of vertices in a connected graph G is a minimal open monophonic .set if no proper subset of S is an open monophonic set of G.The upper open monophonic number om+ (G) is the maximum cardinality of a minimal open monophonic set of G. The upper open monophonic numbers of certain standard graphs are determined. It is proved that for a graph G of order n, om(G) = n if and only if om+(G)= n. Graphs G with om(G) = 2 are characterized. If a graph G has a minimal open monophonic set S of cardinality 3, then S is also a minimum open monophonic set of G and om(G) = 3. For any two positive integers a and b with 4 < a < b, there exists a connected graph G with om(G) = a and om+(G) = b
Fréchet differentiation between Menger probabilistic normed spaces
No full textIn this paper, we define and study Menger weakly and strongly P-convergent sequences and then Menger probabilistic continuity. We also display Frechet differentiation of nonlinear operators between Menger probabilistic normed spaces
On the qualitative properties of differential equations of third order with retarded argument
No full textBy using the standard Liapunov-Krasovskii functional approach, in this paper, new stability, boundedness and ultimately boundedness criteria are established for a class of vector functional differential equations of third order with retarded argument
The forcing connected detour number of a graph
No full textFor two vertices u and v in a graph G = (V, E), the detour distance D(u, v) is the length of a longest u—v path in G.A u—v path of length D(u, v) is called a u—v detour. A set ⊆ V is called a detour set of G if every vertex in G lies on a detour joining a pair of vertices of S.The detour number dn(G) of G is the minimum order of its detour sets and any detour set of order dn(G) is a detour basis of G.A set ⊆ V is called a connected detour set of G if S is detour set of G and the subgraph G[S] induced by S is connected. The connected detour number cdn(G) of G is the minimum order of its connected detour sets and any connected detour set of order cdn(G) is called a connected detour basis of G.A subset T of a connected detour basis S is called a forcing subset for S if S is theuniquecon-nected detour basis containing T. A forcing subset for S of minimum cardinality is a minimum forcing subset of S. The forcing connected detour number of S, denoted by fcdn(S), is the cardinality of a minimum forcing subset for S. The forcing connected detour number of G, denoted by fcdn(G),is fcdn(G) = min{fcdn(S)},where the minimum is taken over all connected detour bases S in G. The forcing connected detour numbers ofcertain standard graphs are obtained. It is shown that for each pair a, b of integers with 0 ≤ a < b and b ≥ 3, there is a connected graph G with fcdn(G) = a and cdn(G) = b
A class of multivalent functions defined by generalized Ruscheweyh derivatives involving a general fractional derivative operator
No full textThe main aim of the present paper is to obtain a new class of multivalent functions which is defined by making use of the generalized Ruscheweyh derivatives involving a general fractional derivative operator.We study the region of starlikeness and convexity of the class . Also we apply the Fractional calculus techniques to obtain the applications of the class . Finally, the familiar concept of δ-neighborhoods of p-valent functions for above mentioned class are employed
Titchmarsh's Theorem for the Dunkl transform in the space L2(Rd,ωk(x)dx)
No full textUsing a generalized spherical mean operator, we obtain a generalization of Titchmarsh's theorem for the Dunkl transform for functions satisfying the (φ, α, β, P)-Dunkl Lipschitz condition in L2(Rd, ωk(x)dx)
Stability of generalized Jensen functional equation on a set of measure zero
No full textLet E is a complex vector space and F is real (or complex ) Banach space. In this paper, we prove the Hyers-Ulam stability for the generalized Jensen functional equatio