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Search Results: 1 - 10 of 593536 matches for " A.; Pérez "
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A Matching Model on the Use of Immigrant Social Networks and Referral Hiring  [PDF]
Mónica García-Pérez
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.24070
Abstract: Using a simple search model, with urn-ball derived matching function, this paper investigates the effect of firm owner’s and coworkers’ nativity on hiring patterns and wages. In the model, social networks reduce search frictions and wages are derived endogenously as a function of the efficiency of the social ties of current employees. As a result, individuals with more efficient connections tend to receive higher wages and lower unemployment rate. However, because this efficiency depends on matching with same-type owners and coworkers, there is also a differential effect among workers’ wages in the same firm. This analysis highlights the potential importance of social connections and social capital for understanding employment opportunities and wage differentials between these groups.
Sotos con santos en lienzos y esculturas. La apropicación de la imagen religiosa en la Provincia de Antioquia, segunda mitad del siglo XVIII
María Cristina Pérez Pérez
Fronteras de la Historia , 2009,
Abstract: Este artículo se propone indagar la importancia de las imágenes religiosas para la Provincia de Antioquia en la segunda mitad del siglo XVIII, basándose fundamentalmente en dos ejes de análisis: los circuitos comerciales establecidos para el ingreso de objetos religiosos a la provincia y el valor de la imagen para la sociedad colonial. Con ello se pretende, además, hacer un acercamiento a un campo de estudio que ha sido poco explorado por la historiografía antioque a, como lo es historia cultural del arte colonial.
Rese a: Chicangana Bayona, Yobenj Aucardo, comp. Historia, cultura y sociedad colonial siglo XVI-XVIII. Temas, problemas y perspectiva. Medellín: La Carreta Histórica, 2008.
María Cristina Pérez Pérez.
Historia Crítica , 2009,
La malaria por Plasmodium Vivax (Grassi y Feletti, 1890) en los trópicos y los retos de la cura radical
Pérez,Hilda A;
Interciencia , 2004,
Abstract: plasmodium vivax is the most widespread species causing human malaria; it prevails in asia, central and south america and the western pacific, and its global burden is of approximately 80 million cases annually. although rarely fatal, the parasite causes recurrent morbid epishowed a well tolerated regimen in adults. however, clinical data from several tropical countries indicate that for an unfailing radical cure of tropical infections a higher dose of pq should be given. it seems therefore, that clinical and epidemiological management of p. vivax malaria in the tropics is complicated by the wide spread of pq tolerant parasites producing short-term relapses in an ecological environment where transmission is favored. studies on the more appropriate therapeutic regimen of pq for radical cure of p. vivax in the tropics are required without delay.
Identidades urbanas y relocalización de la pobreza
Pérez,Soledad A.;
Intersecciones en antropolog?-a , 2004,
Abstract: this article reflects on the way in which urban identities are configured in the fight for the appropriation of territory. the case study was developed in the city of san carlos de bariloche, in the northwest of patagonia, in a neighborhood located behind otto hill 6 km from the centre of the city, which was constructed following the relocation of four hundred families from seven different settlements close to the urban center. the premise of this work is that all representations imply interventions, so we tried to reconstruct the process that generated this policy of concealment of poverty, trying to catch the presumptions and representations that were used in the definition and development of the project. the presupposition that guided the relocation project was that the territorial aspect could determine the social aspect, in such a way that if you add individuals (seen as undifferentiated) together you get a neighborhood. in practice, the relocation of people from different places meant the fragmentation of identities as a result of the alteration of their everyday lives and the disolution of their routines. in the same way, this project generated conflicts, stigmatized the subjects and the space, producing isolation in both the city center and within the dwellings, as neighbors avoid interacting with "the others" with whom they are obliged to share their space.
En busca de mejor fortuna: Movilidad ocupacional y espacial de los inmigrantes espa?oles pobres en el Buenos Aires tardo-colonial
Pérez,Mariana A;
Bolet?-n del Instituto de Historia Argentina y Americana Dr. Emilio Ravignani , 2010,
Abstract: during the late colonial period, numerous spaniards immigrated to buenos aires, encouraged by the economic prosperity of the river plate region. the vast majority belonged to the popular classes: they were soldiers, sailors, artisans, filled the low ranks of the bureaucracy and, most of them, were small merchants. their lives in the river plate were characterized by a strong spatial and occupational mobility, specially during the first years after their arrival. this paper analyzes this aspect of their migratory experiences through the study of population records and criminal procedures.
Production systems, technical parameters and quality of bovine milk producers in southern Chile
Pérez,Jorge A;
Ciencia e investigación agraria , 2011, DOI: 10.4067/S0718-16202011000100002
Abstract: production information of 29 milk producers in the southern region of chile was studied with the objective of characterizing and classifying different dairy production systems, evaluating various associations between quantitative and qualitative studied variables and analyzing the effect of the production system and the quality of bovine milk according to the month of the year that it was processed. the classification of production groups was based on the implementation of the exploratory multivariate technique, main components analysis and conglomerates or cluster analysis. the applied statistical model was: yijk = μ + mi + spj + mspij + eijk, where yijk=dependent variables (fat, protein, count of somatic cells and colony forming units); μ=general average; m=effect of i-th month; spj=effect of j-th productive system; mspij=month-productive system interaction; eijk=random residual effect. the price per liter of milk paid to producer was discarded for the construction of groups, since they presented a low discriminatory power given a coefficient of less than 20 % variation. different correlations between analyzed variables are discussed. five production systems are described using the qualifying variables and original systems. in general, more intensive production systems presented lower values of fat (%) and protein (%), but showed greater superiority in the quality of sanitary milk than dairy farms with minor animal load. regarding seasonality, as winter turns to spring, protein (%) associated with a decrease in the fat (%) increases, which determines an inverse relationship between both variables.
Revisión crítica sobre el síndrome del latigazo cervical (I): ?de veras existe una lesión anatómica?
Ortega Pérez,A.;
Cuadernos de Medicina Forense , 2003, DOI: 10.4321/S1135-76062003000400001
Abstract: whiplash associated disorders (wad) have an approximate incidence of 1 case/1000 persons per year, and with high personal and economic costs. the mechanism of lesion may be more or less complex, depending on the relative directions of the colliding vehicles and on the orientation of the head at the moment of impact. in any case, the key seems to be the non-physiologic movements of the cervical vertebrae which are so rapid that the muscles normally controlling them do not have enough time to perform their function. on impact, virtually any part of the neck can be damaged, although the most frequent lesions affect the zygapophyseal joint facet, capsules or cartilages of either the fifth or sixth cervical vertebrae, as well as the anterior or posterior longitudinal ligaments. however, standard radiographies, ct scans or mri are not appropriate explorations for the detection of these subtle, but clinically relevant lesions and the norm in wad is the absence of image evidence of cervical lesion. standard radiography generally detects previous degenerative changes or a cervical kyphotic angle, a non-specific sign of lesion. mri is more sensitive, but has a high percentage of false positives, i.e., it detects lesions that do not have any clinical relevance.
?Tanta importancia tiene pasar por alto la arteria umbilical única?: Comentarios a partir de una sentencia judicial
Ortega Pérez,A.;
Cuadernos de Medicina Forense , 2004, DOI: 10.4321/S1135-76062004000300005
Abstract: the spanish supreme court has condemned several obstetricians after having informed that the umbilical cord of a fetus had the three vessels, therefore deactivating the search for fetal diseases that the single umbilical artery (sua) would have provoked. the sentence will be ethically correct only if sua is really associated with such diseases. sua is found in about 1 out of every 320 fetuses studied sonographically. in 68% of them, it will be an isolated finding, although it will increase the risks of premature delivery, low birthweight, and perinatal mortality. on the other hand, 17% of these fetuses will have, besides sua, chromosomal alterations, and 31 % of them, structural malformations. in conclusion, sua is an important marker of fetal disorders, and it has to be actively searched for during the ultrasonographic monitoring of the gestation.
La fibromialgia puede desencadenarse a consecuencia de un traumatismo
Ortega Pérez,A.;
Cuadernos de Medicina Forense , 2004, DOI: 10.4321/S1135-76062004000400002
Abstract: fibromyalgia is a known disease, with a prevalence of around 2.5 % of the spanish population over 20 years old. a significant aspect of the disease is that a certain amount of fibromyalgics declare that their illness appeared soon after suffering a mild or severe trauma. patients with post-traumatic fibromyalgia show the same signs and symptoms as those with primary fibromyalgia and their prognosis is similar or somewhat worse than the latter. among other factors determining the agreement with the diagnosis of post-traumatic fibromyalgia, is the specialty of the doctor: rheumatologists seem the most prone to accept it while the majority of orthopedists tend to reject it. according to different publications, the claim for compensation does not modify signs and symptoms or the outcome of these patients. in conclusion, forensic doctors should keep in mind the possibility that the injured patient that does not heal following the usual course of time may suffer from post-traumatic fibromyalgia.
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