نتایج جستجو برای: population decrease
تعداد نتایج: 967835 فیلتر نتایج به سال:
the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...
In aged mice the population of mature peripheral B cells is maintained despite a severalfold decrease in the population of bone marrow B cell progenitors. The analysis of the rate of accumulation of 5'-bromo-2-deoxyuridine (BrdU)-labeled splenic B cells in mice fed BrdU for 8 days to 8 wk demonstrated a severalfold increase in the half-life of mature B cells in aged mice. Consistent with a role...
research is necessary for adjust and improve the process of land degradation in the agricultural, horticultural and also prevent the formation of spatial patterns is uneven and sporadic. the present study sought to analyze the impact of the components of the population (population change and population density) and development land on the spatial pattern of sprawl in the study area. in this pap...
This survey is a descriptive analytic study which was carried out to assess the effects of population control programs on National Health Development in Islamic Republic of Iran (1986-1998). The objectives of the study are: 1)To determine the effects of family planning program on National Health Development ( 1986-1998). 2) To indicate the relationship between family planning coverage and some...
The aims of surgical treatment for cholesteatoma include complete removal of disease and formation of a dry, self cleaning ear in addition to hearing reconstruction. This presentation concentrates on techniques of open mastoid surgery or modified radical mastoidectomy to achieve a well-constructed cavity. This study analyzes both primary and revision mastoid surgery referred to the author. ...
This study aimed to analyze the relationship between Cygnus spp. population trends and land-use changes artificial development activities in Nakdonggang Estuary for necessity of management buffer area outside protected boundary Korea. Analysis 15-year change revealed a sharp decline columbianus winter, which could be attributed becoming unfeasible as their wintering site. In contrast, there was...
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