Fertility and family planning among the elderly in Taiwan or integrating the demography of aging in population studies
Birth control ; Demographic structure ; Demography ; Family ; Fertility ; Population ageing
The demography of aging has given major attention to fertility and mortality because of their centrality in determining age structure and their rather direct translation into family-level issues associated with population aging.
Demographic change ; Europe ; European Union ; Population ageing ; Region ; Typology ; Years 1990-99
The aim of this paper is to describe the level and trends of demographic ageing in European Union after its expansion. The analysis of the state and process of this phenomenon was conducted according to the intra-regional division of countries
and was based on data obtained from Eurostat from the years 1993-2003. In the end an attempt was taken to show perspectives in respect to ageing up to 2025. The dynamics of the process was determined with the help of the dynamic ageing index (Wsd). In this way
different population ageing types were obtained which were given the following names : A- older with rapid ageing, B- older with slower ageing, C- older with rejuvenation, D- younger with rapid ageing, E- younger with slower ageing, F- younger
Slovakia's settlement towards the end of the middle Ages
Géographie de l'Europe ; Géographie historique ; Habitat rural ; Moyen Age ; Peuplement ; Peuplement urbain ; Répartition de la population ; Réseau de peuplement ; Slovensko ; Tchécoslovaquie
An analyse of the state of Slovakia settlement in the late Middle Ages, particularly from 1511 to 1530, with 1 map supplement. Urban settlements and the Wallachian colonisation. - (MS)
Reconstruction of Little Ice Age events in the canadian Rocky Mountains
Canada ; Datation ; Dendrochronologie ; Glaciaire ; Géographie de l'Amérique ; Lichenométrie ; Montagne ; Moraine ; Petit Age Glaciaire ; Radiocarbone ; Rocky Mountains
Principales techniques utilisées pour la datation des moraines du Petit Age Glaciaire et reconstitution des phases d'avancée glaciaire sur 33 glaciers.
On the possibility of cyclic recurrence of ice ages during the Neogene
Author investigates the possibility of cyclic recurrence of ice during the Neogene. Firstly, the main concepts regarding the reasons behind the emergence of ice ages are discussed and evaluated. Then author concentrates on the main triggers of ice
ages and the major periods of Pleistocene glaciations. Characteristics of these periods are described. - (JS)
The AA. recommend the use of the terms numerical-age, calibrated-age, relative-age, and correlated-age. They also classify dating methods by type into sideral, isotopic, radiogenic, chemical and biological, geomorphic and correlation methods
. The use of absolute is inappropriate for most dating methods, and should be replaced by numerical . The use of date should be minimized in favor of age or age estimate . They recommend use of the abbreviations ka and Ma for mostages| calender dates can
be used were appropriate and Yr B.P. can be used for radiocarbon ages.
Two different volcanic ash-falls of Allerod age in high Belgium
Applying the same method to different ash layers, two volcanic ash-falls of Allerod age are distinguished: the Brackvenn ash-fall (14C age: 10 830 45 a B.P.) and the Konnerzvenn ash-fall (14C age: 11 030 160 a B.P.). (LW).
New age control on the Port Huron moraine in northern Michigan
This paper presents a radiocarbon age for organic matter from silt deposited on the proximal margin of the northwest section of the Port Huron system in Michigan. On the basis of geographic position and stratigraphy the AA. believe that deposition
of the silt immediately postdates formation of the moraine, thus providing a minimum age for the Inner Port Huron moraine. Several previously published radiocarbon ages establish a limit for its maximum age. Together, these ages provide a basis for 1
) bracketing the age of the northwest part of the complex, 2) corroborating its time-equivalency with the Wyoming moraine in Ontario, and 3) discussing age relationships among all five parts of the system.
Population ageing in Germany and Poland : a comparison of regional developments in the 1990s
Age group ; Comparative study ; Demography ; Germany ; Poland ; Population ; Population ageing ; Population growth ; Regional development ; Urbanization
The authors show common trends of ageing for Poland and Germany, important regional variations, but also some different developments. In both countries, the process of ageing was well on the way with particular rapid developments in regions
of deindustrialisation, out-migration, and population decrease. A major determinant is the sharp fertility decline after the process of ageing could especially be observed for East Germany and Poland. In both territories new suburbanization is connected
with the relatively low degree of ageing, whereas 1990s. By contrast, West-German cities had a different development. Ageing was already relatively high in 1991, but the growth rates remained under-proportional. - (IfL)
This study examines the dichotomy that C 14 ages for noncollagenous fossils are underestimated, whereas ages for collagenous fossil bones are more accurate. There is a high probability that amino acids from poorly preserved fossils will date younger
than the true age of the fossil and that the radiocarbon dates could be decreased by 2 000 to 9 000 yr or more. By existing AMS techniques, the measured ages would probably be Holocene, not Pleistocene.
Late Weichselian marine C 14 reservoir ages at the western coast of Norway
The purpose of this study was to measure the marine reservoir age directly and test if these rapid fluctuations had any influence on the reservoir age of the Norvegian Sea. The main result is that the reservoir age for the Bølling-Allerød interval
was 380 yr on the western coast of Norway, close to the present value, and considerably less than the Youger Dryas reservoir age.
Little ice age alluvial fan development in Langedalen, western Norway
Alluvial cone ; C 14 dating ; Climatic variation ; Geochronology ; Little ice age ; Norway ; Palaeo-ecology ; Palaeogeography ; Pollen analysis ; Sedimentology
This paper reports a preliminary investigation of the sedimentary succession in 2 alluvial fans in western Norway. Sedimentological information is supplemented by palaeoecological data from pollen analysis and the age of the sequence is constrained
by 6 radiocarbon age estimates on woody fragments and peat. On the basis of this information a pattern of enhanced fan development and vegetation change coincident with the climatic deterioration of the Little Ice Age can be established.
People and environment in the Russian Far East from Paleolothic to Middle Ages: chronoloogy, palaeogeography, interaction
Action anthropique ; Age du bronze ; Age du fer ; Archéologie ; Datation C 14 ; Géographie historique ; Habarovsk ; Moyen Age ; Néolithique ; Palynologie ; Paléogéographie ; Paléolithique ; Russie ; Site archéologique
Archaeology ; Archeological site ; Bronze Age ; C 14 dating ; Historical geography ; Human impact ; Iron Age ; Khabarovsk ; Middle Age ; Neolithic ; Palaeogeography ; Palaeolithic ; Palynology ; Russia
Time-space differences of population ageing in Europe
Europe ; Population ; Population ageing ; Population pyramid ; Socio-economic indicators ; Space time ; Twentieth Century ; Twenty-first century
The main aim of the paper is to analyse the time-space development of the age structure of the European population. The period of investigation is 1950-2010 which is extended by a projected development until 2060. Changes in age structure
are analysed through several indicators such as coefficients of inflow, outflow and exchange, as well as with indices of economic and social support. AA. make also efforts to provide a complex assessment on population ageing. Using the method of standardised
variable, 11 indicators of age structures for 39 European countries are used in the synthesis. In view of the londer time span, several types of age structures are pointed out in Europe. - (AM)