Search results for "POPULATION"

2022

The quality of wintering habitats, such as depth of snow cover, plays a key role in sustaining population dynamics of Arctic lemmings. However, few studies so far investigated habitat use during the Arctic winter. Here, we used a unique long-term time series to test whether lemmings are associated with topographical and vegetational habitat features for their wintering sites. We examined yearly numbers and distribution of 22 769 winter nests of the collared lemming Dicrostonyx groenlandicus (Traill, 1823) from an ongoing long-term research on Traill Island, Northeast Greenland, collected between 1989 and 2019, and correlated this information with data on dominant vegetation types, elevatio…

A Research Project about Communism in Romanian Countryside: Ploughmen’s Front Propaganda (1944-1953)

2013

The Ploughmen Front represented the strongest and the oldest “comrade” of the Communist Party from Romania, with a major role in the countryside communization. In general, the studies dedicated to Romania communization focused on institutionalization of the regime, liquidation of democratic order, repression, anticommunist resistance and less on the transformations undergone by the Romanian countryside. The only important issue was the agriculture collectivization. Our project takes into consideration a new approach, which is the research of the way communism became popular in the rural areas, which meant 80% of the Romanian population, how the popularity of the historical parties was dislo…

A Cross-sectional Growth Study of Forearm Length and Tibial Length in an Indigenous Andean Population of 6 to 19 Years of Age.

1997

Patterns of growth in forearm length and tibial length were studied in 149 school-children of Aymara ancestry (73 boys and 76 girls), aged 6 to 19 years. The investigation was based on a cross-sectional survey performed in 1987 in the rural community of Putre (3, 530 m), northern Chile. The results show that there is little sexual dimorphism over the age period of 6 to 13 years, while sex differences are more pronounced between the ages of 14 and 17 years, both for forearm length and tibial length, with boys having higher means. Correspondingly, the maximum values achieved for both measurements are greater in boys than in girls. The growth spurt begins about two years earlier in girls than …

A distributed visualization system for crowd simulations1

2011

The visualization system of large-scale crowd simulations should scale up with both the number of visuals views of the virtual world and the number of agents displayed in each visual. Otherwise, we could have large scale crowd simulations where only a small percentage of the population is displayed. Several approaches have been proposed in order to efficiently render crowds of animated characters. However, these approaches either render crowds animated with simple behaviors or they can only support a few hundreds of user-driven entities. In this paper, we propose a distributed visualization system for large crowds of autonomous agents that allows the visualization of crowds animated with co…

Method effects associated with negative worded items in the 29 items spanish version of Ryff's Well-being Scales

2018

Aim Although they have been frequently used in the literature, there has been much confusion concerning Ryff’s Well-being Scales, such as their factor structure and the effects of method due to the use of reversed items. A common practice nowadays is the use of positively worded items and reversed forms, in order to reduce response bias. However, in many different studies have been seen that this practice introduce method effects in the scores, leading to problems of reliability and validity. This work had two goals: first, to verify the factor structure of the 29-item Spanish version of the original Ryff’s Well-being Scale in an athlete population, and second, to determine whether the meth…

Production of monodisperse uranium oxide particles and their characterization by scanning electron microscopy and secondary ion mass spectrometry

2000

Abstract Secondary ion mass spectrometry (SIMS) can be confidently used to measure uranium isotopic ratios in single particles. Dense particles of known isotopic composition and size allow the precision and the accuracy of the applied procedure to be estimated. These particles can be obtained by dissolving standard reference uranium materials, nebulizing the solution in droplets of proper diameter and collecting the particles after the desolvation and calcination of the droplets. A new instrumental set up, based on a commercial vibrating orifice aerosol generator to generate monodisperse droplets of the solutions from four uranium oxide reference materials, is described. The droplets were d…

A Population-Based Approach to the Resource-Constrained Project Scheduling Problem

2004

We present a population-based approach to the RCPSP. The procedure has two phases. The first phase handles the initial construction of a population of schedules and these are then evolved until high quality solutions are obtained. The evolution of the population is driven by the alternative application of an efficient improving procedure for locally improving the use of resources, and a mechanism for combining schedules that blends scatter search and path relinking characteristics. The objective of the second phase is to explore in depth those vicinities near the high quality schedules. Computational experiments on the standard j120 set, generated using ProGen, show that our algorithm produ…

Ikääntyvien opiskelu ja koulutus

1994

Right up to the present, study by the elderly has focused mainly on general adult education. Consequently, marginalisation in this area has been particularly harmful to this section of the population, the people who have received the least education in our society. The motives and points of departure concerning the elderly have not yet been clearly formulated in adult education. This state of affairs is exemplified by the facts that adult education policy statements almost entirely by-pass the issue of education for the elderly and that an educational policy aimed at the elderly simply does not exist. The elderly can no longer be expected to be satisfied with mere activities for the sake of…

Eclecticismo en la intervención con adolescentes en conflicto con la ley

2014

El trabajo social, como disciplina científica, se dota de marcos conceptuales que son derivados de otras ciencias sociales que legitiman y avalan su práctica profesional. A lo largo de su historia, ha ido produciéndose enfoques conceptuales y modelos teóricos que dirigen la intervención profesional con la finalidad de abordar, eficazmente, la pluralidad de problemáticas y demandas sociales que integra su ámbito de actuación. En el presente artículo, se exponen aquellos esquemas referenciales cuya aplicación resultan particularmente fructíferos en la intervención con adolecentes en conflicto con la ley en el ámbito nacional. En consecuencia, se describen y contrastan los principales modelos,…

El Sentido de la Escolaridad Obligatoria como Transición o como Fin

2017

Resumen:Una de las principales dificultades de nuestro sistema educativo en el actual momento sociohistórico estriba en que parte de la población no acaba satisfactoriamente la etapa obligatoria al no titular a la edad prevista. En este artículo abordamos esta problemática desde las limitaciones que impone el sistema al considerar la escolarización obligatoria como una etapa de transición y no como un fin en sí misma. En este sentido, asumimos que no es posible desligar lo que sucede en la etapa obligatoria de las posibilidades a las que da acceso, puesto que la posición social adquirida mediante lo laboral queda en relación con los resultados obtenidos en el itinerario educativo. Abordamos…