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41.
42.
Kazuo Nakamura 《Researches on Population Ecology》1968,10(1):45-53
Summary An wolf spider,Lycosa pseudoannulata, collected from the field were reared in test tubes supplied with fruit flies as the food, and the number and weight of fruit
flies killed per unit time and the weight of residuum of killed flies were recorded. When the cumulative number of flies killed
by a spider was plotted against time after the beginning of food supply, the angle of the curve obtained decreased gradually
until a constant value. In this time, it seems that the gut of spider had saturated with food and the increase rate of number
of flies killed reflects the rate of food disappeared from gut by assimilation and egestion. The amount of ingestion was obtained
by subtracting the weight of residuum and the gain of live weight of the spider from the weight of killed flies. After the
gut has saturated, the amount of food remained in the gut is considered to be equal to the capacity of gut, which is an essential
factor in the study of predation. The amount of food disappearance from gut was also estimated.
There was a linear relationship between the log body weight of spiders and the log capacity of gut. The linear relationship
was also seen between the log total amount of ingestion and the log total amount of food disappeared from gut. 相似文献
43.
Nakamura M Fujimura T Nagata M Hosoda C Suzuki M Fukuhara H Enomoto Y Nishimatsu H Kume H Igawa Y Homma Y 《The aging male》2012,15(2):111-114
44.
Kazuo Nakamura Yosiaki It? Kazuyoshi Miyashita Akira Takai 《Researches on Population Ecology》1964,6(2):67-78
Summary Estimation of the number of adult grasshoppers,Mecostethus magister, was made by means of the mark-and-recapture method. The birth and death rates are possible to be estimated at the same time,
but the immigration and the emigration rate are inevitably involved in these respectively. The immigration and emigration
rates must be made clear to know the true birth and death rates. For this purpose the movement of the marked males in 1963
was analyzed.
The grasshoppers dominantly moved in the directions of N, NW and W, and the difference in frequency among the movement directions
was not so large. The distribution of the dispersal-distance relationship of each quadrate on each released day was fitted
approximately to normal distribution. It could be concluded that almost all of the grasshoppers moved within the range of
about 31–35m. The emigration rate from the quadrate (12×12m2) was about 0.73–0.77 and the difference in the rate among the released days was small. From these values the emigration rate
from the station (84×60m2) was estimated as 0.21–0.23.
Subtracting the emigration rate from the death-and-emigration rate, the true death rate was calculated. The death rate was
very low until the number of males reached to the peak, then increased gradually. Supposing that immigration rate was equal
to the emigration rate, the true birth rate was also estimated. But the presumption might not be pertinent, for the value
of birth rates became negative. 相似文献
45.
Luiz R. Nakamura Pedro H. R. Cerqueira Thiago G. Ramires Rodrigo R. Pescim R. A. Rigby Dimitrios M. Stasinopoulos 《Journal of applied statistics》2019,46(3):416-431
We introduce a new flexible distribution to deal with variables on the unit interval based on a transformation of the sinh–arcsinh distribution, which accommodates different degrees of skewness and kurtosis and becomes an interesting alternative to model this type of data. We also include this new distribution into the generalised additive models for location, scale and shape (GAMLSS) framework in order to develop and fit its regression model. For different parameter settings, some simulations are performed to investigate the behaviour of the estimators. The potentiality of the new regression model is illustrated by means of a real dataset related to the points rate of football teams at the end of a championship from the four most important leagues in the world: Barclays Premier League (England), Bundesliga (Germany), Serie A (Italy) and BBVA league (Spain) during three seasons (2011–2012, 2012–2013 and 2013–2014). 相似文献
46.
We propose a triple test to evaluate the usefulness of behavioral economics models for public health policy. Test 1 is whether the model provides reasonably new insights. Test 2 is on whether these have been properly applied to policy settings. Test 3 is whether they are corroborated by evidence. We exemplify by considering the cases of social interactions models, self-control models and, in relation to health message framing, prospect theory. Out of these sets of models, only a correctly applied prospect theory fully passes the tests at present. Specifically, in broad agreement with the evidence, a gain frame has positive implications for welfare encourages disease prevention activity, though this does not apply if the perceived probability of the bad health outcome is large enough. We see our tests as being useful to identify how much health policy weight policy makers should assign to specific behavioral economic models; they are also useful to verify what next steps would be most useful in further research. 相似文献
47.
Tsuyoshi Adachi 《Social Choice and Welfare》2014,42(4):813-830
We consider the problem of allocating multiple units of an indivisible good among a group of agents in which each agent demands at most one unit of the good and money payment or receipt is required. Under general preference domains that may contain non quasi-linear preferences, the Vickrey allocation rule is characterized by axioms for equity and continuity without use of efficiency: namely, the Vickrey rule is the only rule that satisfies strategy-proofness, weak envy-freeness for equals, non-imposition, and continuity of welfare. 相似文献
48.
Atsushi Miyake Kazunobu Muro Tamotsu Nakamura Masaya Yasuoka 《Journal of Economic Inequality》2009,7(4):387-394
We present a simple model that explains two features of the dynamics of wage inequalities: between-group and within-group.
Individuals are assumed to be heterogeneous in their innate abilities. With the advent of a new technology, each individual
decides whether or not to acquire the skill for the new high-tech sector. The heterogeneity explains not only the between-group
wage inequality but also the within-group wage inequality, which are observed in advanced countries such as the US and UK. 相似文献
49.
50.