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Search Results: 1 - 10 of 6486 matches for " Jennifer; Valera "
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Nota técnica
Giffoni,Jennifer; Valera,Neicy; Díaz,Francisco; Vásquez,Carlos;
Bioagro , 2007,
Abstract: abstract chrysoperla externa (hagen) is an important insect predator on several agricultural pests. effect of feeding on several preys on life span of c. externa was studied under laboratory conditions (27 ± 2 oc mean temperature and 60 ± 5 % r.h.). each of the following preys was daily offered ad libitum to predator: sitotroga cerealella (oliver), aphis craccivora (koch), aphis nerii boyer de fonscolombe, thrips tabaci lyndeman and tetranychus cinnabarinus (boisduval). duration of larval stage was significant lower (7.7 and 10.15 days) when fed on s. cerealella or a. craccivora, whilst when fed on a. nerii, t. tabaci and t.cinnabarinus it lasted 20.3, 19.1 and 16.4 days, respectively. predator reached pupal stage just when fed on s. cerealella eggs or a. craccivora nymphs and adults showing time mean of 7.95 and 7.55 days, respectively. conversely, only one individual reached this stage when feeding on a. nerii or t. tabaci, and no predator reached pupal stage when t. cinnabarinus was used as food source. it is concluded that s. cerealella and a. craccivora were the most adequate food sources for predator development, while a. nerii, t. tabaci and t. cinnabarinus resulted less appropriate
Nota técnica Biological cycle of Chrysoperla externa (Hagen) (Neuroptera: Chrysopidae) feeding on several preys
Jennifer Giffoni,Neicy Valera,Francisco Díaz,Carlos Vásquez
Bioagro , 2007,
Abstract: RESUMEN Chrysoperla externa (Hagen) es un insecto importante como depredador de varias plagas agrícolas. Se evaluó el efecto de la alimentación con diferentes presas sobre la duración del ciclo biológico del mismo bajo condiciones de laboratorio (27 ± 2 oC de temperatura y 60 ± 5 % de HR). Diariamente, cada una de las siguientes presas fue ofrecida sin restricciones al depredador: Sitotroga cerealella (Oliver), Aphis craccivora (Koch), Aphis nerii Boyer de Fonscolombe, Thrips tabaci Lyndeman y Tetranychus cinnabarinus (Boisduval). Se obtuvieron diferencias significativas en la duración promedio de la fase larval (7,7 y 10,15 días) cuando esta se alimentó de S. cerealella o A. craccivora, mientras que al usar A. nerii, T. tabaci y T. cinnabarinus, la larva duró en promedio 20,3; 19,1 y 16,4 días, respectivamente. El estado de pupa del depredador sólo fue alcanzado cuando éste fue alimentado con huevos de S. cerealella o ninfas y adultos de A. craccivora con los cuales se obtuvo una duración promedio de la pupa de 7,95 y 7,55 días, respectivamente. Contrariamente, sólo un individuo del depredador logró alcanzar este estadío cuando fue alimentado con A. nerii y T. tabaci, mientras que aquellos depredadores alimentados con T. cinnabarinus no lograron desarrollarse hasta pupa. Se concluye que las presas más adecuadas para el desarrollo del depredador fueron S. cerealella y A. craccivora mientras que A. nerii, T. tabaci y T. cinnabarinus no resultaron apropiadas ABSTRACT Chrysoperla externa (Hagen) is an important insect predator on several agricultural pests. Effect of feeding on several preys on life span of C. externa was studied under laboratory conditions (27 ± 2 oC mean temperature and 60 ± 5 % R.H.). Each of the following preys was daily offered ad libitum to predator: Sitotroga cerealella (Oliver), Aphis craccivora (Koch), Aphis nerii Boyer de Fonscolombe, Thrips tabaci Lyndeman and Tetranychus cinnabarinus (Boisduval). Duration of larval stage was significant lower (7.7 and 10.15 days) when fed on S. cerealella or A. craccivora, whilst when fed on A. nerii, T. tabaci and T.cinnabarinus it lasted 20.3, 19.1 and 16.4 days, respectively. Predator reached pupal stage just when fed on S. cerealella eggs or A. craccivora nymphs and adults showing time mean of 7.95 and 7.55 days, respectively. Conversely, only one individual reached this stage when feeding on A. nerii or T. tabaci, and no predator reached pupal stage when T. cinnabarinus was used as food source. It is concluded that S. cerealella and A. craccivora were the most adequate food sources for pre
THE DESCRIPTIVE STUDY OF PREPROCESSING FROM WEB USAGE MINING
MANISHA VALERA
Indian Streams Research Journal , 2012,
Abstract: Now a day World Wide Web become very popular and collaborative for transferring of information. The web is huge, diverse and active and thus increases the scalability, multimedia data and temporal matters. The several kinds of data have to be organized in a manner that they can be accessed by several users effectively and efficiently. So the usage of data mining methods and knowledge discovery on the web is now on the spotlight of a boosting number of researchers. Web mining is the extraction of exciting and constructive facts and inherent information from artifacts or actions related to the WWW. Web usage mining is a kind of data mining method that can be useful in recommending the web usage patterns with the help of users' session and behavior. Web usage mining includes three process, namely, preprocessing, pattern discovery and pattern analysis. After the completion of these three phases the user can find the required usage patterns and use this information for the specific needs. Web usage mining requires data abstraction for pattern discovery. This data abstraction is achieved through data preprocessing. In this paper we survey about the data preprocessing activities like data cleaning, user identification, session identification, path completion
Storia delle scienze e analisi delle società: qualche considerazione di metodo
Gabriella Valera
Scienza & Politica : per una Storia delle Dottrine , 1989, DOI: 10.6092/issn.1825-9618/3070
Abstract: Storia delle scienze e analisi delle società: qualche considerazione di metodo.
Review of Park (1999). La ciudad y otros ensayos Review of Park (1999) La ciudad y otros ensayos de ecología urbana
Sergi Valera
Athenea Digital , 2012,
Abstract:
(Locally) shortest arcs of special sub-Riemannian metric on the Lie group $SO_0(2,1)$
Valera Berestovskii
Mathematics , 2014,
Abstract: The author finds geodesics, shortest arcs, cut locus, and conjugate sets for left-invariant sub-Riemannian metric on the Lie group $SO_0(2,1)$ under the condition that the metric is right-invariant relative to the Lie subgroup $SO(2)\subset SO_0(2,1)$.
Evolución de la Red Nacional de Laboratorios 2006-2008: los cambios en la normativa impulsaron cambios en el desempe?o del laboratorio de salud pública.
Segura,Omar; Valera,Danik;
Investigaciones Andina , 2009,
Abstract: introduction: colombia developed its law and health services on international counseling; public health laboratory (phl) is an example. evolution of national public health, specially during 2003 to 2007 paved the way for a phl diagnostic and evaluation from the law and quality management. methods: descriptive longitudinal study with independent surveys to the phl based upon a proposal for an “authorization system” and a modification and application of epidemiologic surveillance cycle to make information feedback and follow-up onto the phl. results: phl coordinators participation was important during 2006 to 2008, up to 67%. phl reached in 2008 64% in management and 77% in technical requirements; items with the most progress were organization & client service, quality assurance and biosafety. conclusions: law was positively influential in the phl performance; there are evidences of advances in quality with technical competence; their personnel, methods, processes and facilities do require technical assistance from central level. it is needed a prospective exercise for the future.
OBELISCO, contenido web al alcance de la mano
Valera, Ramón;
JISTEM - Journal of Information Systems and Technology Management , 2004, DOI: 10.1590/S1807-17752004000100006
Abstract: the basic principle for design and handling of any website in the internet or intranet is centered in the attractiveness, easy to manage, up-to-date, reliability and accuracy. when they are administered by a person and the information generated in different levels of the organization surpasses their capacity, we find places outdated, inexact and not very coherent that can tunnel the image and credibility of a company in the world of the internet. due to this problem arises the necessity of creating a tool that automates the creation process, approval and distribution of the information, guaranteeing its coherence and presentation, using a simple and concrete process, this way obelisco emerges, as a tool based on apis open code with friendly and simple interfaces that allows users with little or no experience in technology to place its works in the web.
Soy lo que no fui: Persona y personaje en el límite de lo real y lo ficcional
Valera-Villegas,Gregorio;
Letras , 2008,
Abstract: in this work we have aimed at trying to understand the imaginative-creative process of becoming what one is not, on the basis of the reading/re-writing of a person and a character (pariah-victim and excluded) on the edge of what is represented on the uncertain border between the real and the fictional, in the historic social context of the venezuelan and latin-american xx century. in this sense, this research work consists of the development of a critical hermeneutic phenomenology, whose pre-texts are some stories that stand as recreation referent of the above individuals.
El proceso de formación del profesional en la educación superior basado en competencias: el desafío de su calidad, en busca de una mayor integralidad de los egresados
Valera Sierra,René;
Civilizar Ciencias Sociales y Humanas , 2010,
Abstract: this paper provides a theoretical reflection about the process of professional training in higher education, the aim of a comprehensive education designed to build a socially and professionally committed professional, flexible and transcendent, to what is required of a competency-based curriculum.
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