全文获取类型
收费全文 | 80篇 |
免费 | 0篇 |
专业分类
管理学 | 3篇 |
人口学 | 22篇 |
理论方法论 | 4篇 |
综合类 | 1篇 |
社会学 | 30篇 |
统计学 | 20篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 1篇 |
2013年 | 16篇 |
2012年 | 2篇 |
2011年 | 1篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 4篇 |
2006年 | 1篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2002年 | 1篇 |
1999年 | 1篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 1篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1978年 | 1篇 |
1972年 | 1篇 |
1970年 | 1篇 |
1969年 | 1篇 |
1967年 | 1篇 |
1966年 | 2篇 |
1964年 | 1篇 |
排序方式: 共有80条查询结果,搜索用时 15 毫秒
51.
Yosuke Osuka Muneaki Matsubara Ai Hamasaki Yuji Hiramatsu Hiroshi Ohshima Kiyoji Tanaka 《European review of aging and physical activity》2017,14(1):14
Background
The purposes of this study were to identify 1) the feasibility of a novel exercise protocol (elderly Japanese male version of high-intensity interval aerobic training: EJ-HIAT) and 2) its preliminary data (%V?O2peak, rating of perceived exertion) in comparison with traditional moderate-intensity continuous aerobic training (MICT).Results
Twenty-one sedentary elderly men, aged 60–69 years, performed two exercise protocols: EJ-HIAT, consisting of 3 sets of 2?3-min cycling at 75?85%V?O2peak with 1??2-min active rests at 50%V?O2peak between sets, and MICT, consisting of 40-min cycling at 65%V?O2peak. The completion rate, defined as the rate of participants who 1) did not demand withdrawal, 2) were not interrupted by the tester, and 3) did not change the workload during either exercise protocol, of EJ-HIAT was similar to that of MICT (EJ-HIAT: 100%, MICT: 95.2%). Maximal perceived exertion ratings assessed by Borg scale were also similar between EJ-HIAT and MICT. However, objectively measured maximal intensity assessed by %V?O2peak was higher for EJ-HIAT than for MICT (EJ-HIAT: 86.0 ± 5.6%, MICT: 67.1 ± 6.4%).Conclusion
These results suggested that EJ-HIAT has good feasibility and perceived exertion similar to MICT despite having higher objectively measured intensity than MICT. An intervention aimed as identifying the effects of EJ-HIAT on exercise tolerance should be performed in the future.Trial registration
UMIN000021185 (February 26, 2016).52.
Kiyokawa Yasushi Koizumi Ryoko Yamada Ryoko Hijikata Masayuki Kimura Goro Tanaka Kazuyuki D. Takeuchi Yukari Tanikawa Tsutomu 《Urban Ecosystems》2021,24(5):1011-1021
Urban Ecosystems - Brown rats (Rattus norvegicus) and roof rats (Rattus rattus) are among the most common mammals worldwide. Little is known about the effects of season on rat population size,... 相似文献
53.
Ziyi Qin Katsuya Tanaka Shunji Matsuoka 《International Journal of Japanese Sociology》2022,31(1):110-126
This article investigates regional social capital development by focusing on disparities in bonding and bridging social capital among rural and urban areas of Japan. Rural–urban differences in social capital in Western contexts have been discussed by many studies. Their main finding is that bonding social capital is richer in rural areas and bridging social capital is richer in urban areas. However, the empirical evidence presented in this article suggests that in Japan both bridging and bonding social capital are richer in rural than urban areas, diverging from traditional thinking about these two types of social capital. This finding suggests that urbanization and depopulation in rural areas of Japan have led to changes in people's behavior and their demand for social networks, promoting the development of bridging social capital in rural areas. 相似文献
54.
In two-parameter family of distribution, conditions for a modified maximum likelihood estimator to be second-order admissible are given. Applying these results to two-parameter logistic regression model, it is shown that the maximum likelihood estimator is always second-order inadmissible and the Rao-Blackwellized minimum logit chi-squared estimator is second-order admissible if and only if the number of the doses is greater than or equal to 6. 相似文献
55.
The RV-coefficient (Escoufier, 1973; Robert and Escoufier, 1976) is studied as a sensitivity coefficient of the subspace spanned by dominant eigenvectors in principal component analysis. We use the perturbation expansion up to second order term of the corresponding projection matrix. The relationship with the measures by Benasseni (1990) and Krzanowski (1979) is also discussed. 相似文献
56.
Summary Stability of the stock-harvesting system regulated by a feedback control procedure of catch quota is examined. In the procedure
considered, catch quota is changed proportionally to the difference between current and the target stock level (with a proportionality
constanth) and to the annual stock growth rate (with a proportionality constantg). Condition for the local stability of the target equilibrium is obtained as a function of the stock-recruitment relation,
survival probability of adults, target stock level, time lag before implementation of regulation, age of sexual maturity of
the stock, and proportionality constantsg andh. It is shown that, (1) the procedure has the stabilizing effect; it can stabilize the target stock level that is unstable
under constant harvest, (2) lower target stock level favors largerg and smallerh, when the target is set around MSYL (the stock level that gives MSY), (3) the degree of stability, measured by the time required
to recover the target stock level, is an increasing function of the target stock level, (4) stability and sustainable yield
are in trade-off, (5) time delay caused by the time needed before sexual maturity does not affect the stability significantly,
but the effect of the time lag before implementation of regulation is significant. Comparison between harvest-control and
effort-control procedures is also made, and the advantage of the latter in terms of stability is shown. 相似文献
57.
Summary A field work with two plots of grid, a snap trap being set on each station spaced 5 m apart, was executed in the summer of
1968 to evaluate prebaiting in census trapping by comparing the result in one plot, prebaited for three days, with that in
the other not prebaited. Since the population was as high as some 230 per acre on the average in density and formed of the
vole,Microtus montebelli, alone, sufficient samples were gathered irrespective of the plot size as small as 50×50 m.
Owning to the circumstances, multiple collisions inflicted so intense influence on sampling especially in the prebaited plot
thatz-equation for census adjusted to the effect was well applicable to the data in either plot. In sampling, the fact that small
voles are apt to be caught later than large voles was statistically evidenced in either sex, and yet any proof that males
tend to be caught prior to females was not offered. It was ascertained in either plot that the daily catch was realized according
to the same rule through the whole period of trapping in both external belt and internal square within the plot; hence it
follows that no considerable immigration occurred.
One of the beneficial effects of prebaiting is sure to be that the probability of capture was markedly enhanced in the prebaited
plot, and a second is supposed, though inconclusively, to be that a good sampling could be executed consistently through the
census period giving rise to no inordinate catches perhaps due to heterogeneous sampling as was seen in earlier days in the
not prebaited plot. The supposition has derived from the condition that most of the whole population is trappable, which is
established by interrelation among population density, size of home range and trap spacing. It was suggested that the effect
of prebaiting should be evaluated from the view-point of the interrelation, because the basic utility of prebaiting consists
in that it may help to our utlimate purpose to estimate the whole population.
Contribution from JIBP-PT No. 55, carried out by the grant from the expenditure of Education Department to the specific study
on “Dynamics of Biosphere” 相似文献
58.
Summary We have devised a census formula of curvilinear regression suitable for capture-recapture data of recapture-addicted populations
of the Japanese field vole (Microtus montebelli) obtained under a grid-plan with single-catch traps in order to estimate the whole population. The equation is founded on
the assumption that the trappable population on the initial day is increased in way of an exponential curve until it reaches
to the whole during one trapping period. The effect of trap-preoccupation by marked and multiple collisions is considered
in the formula. As a result of its application to field data of the vole, it has turned out that the equation is required
for the data gained under the trapping plan with trap spacing 10m, but not for those under the plan with spacing 5m, to estimate
the whole. A convenient method of analysis of the formula is offered here, but we have been yet unable to introduce assymptotic
variance of estimates.
Contributions from JIBP-PT No. 19, carried out by the grant from the expenditure of Education Department to the specific study
on “Dynamics of Biosphere”. 相似文献
59.
Yoshinari Tanaka 《Researches on Population Ecology》1990,32(2):329-335
Summary Age-specific effects of inbreeding on fecundity were assayed for adzuki bean weevilCallosobruchus chinensis by comparing inbred lines and their cross. Four consecutive full-sib matings reduced only 10.3 percent in total fecundity,
and did not decrease early fecundity at all until third day from the onset of reproduction. It is suggested that recessive
detrimental genes have been eliminated from the early period of adult life span when reproductive value is high. There was
a slight tendency that inbreeding depression increased as age proceeded though not statistically significant. 相似文献
60.
This paper deals with improved estimation of a gamma shape parameter from a decision-theoretic point of view. First we study the second-order properties of three estimators – (i) the maximum-likelihood estimator (MLE), (ii) a bias corrected version of the MLE, and (iii) an improved version (in terms of mean squared error) of the MLE. It is shown that all the three estimators mentioned above are second-order inadmissible. Next, we obtain superior estimators which are second order better than the above three estimators. Simulation results are provided to study the relative risk improvement of each improved estimator over the MLE. 相似文献