排序方式: 共有29条查询结果,搜索用时 15 毫秒
1.
2.
ABSTRACTThe purpose of this paper is to prove, under mild conditions, the asymptotic normality of the rank estimator of the slope parameter of a simple linear regression model with stationary associated errors. This result follows from a uniform linearity property for linear rank statistics that we establish under general conditions on the dependence of the errors. We prove also a tightness criterion for weighted empirical process constructed from associated triangular arrays. This criterion is needed for the proofs which are based on that of Koul [Behavior of robust estimators in the regression model with dependent errors. Ann Stat. 1977;5(4):681–699] and of Louhichi [Louhichi S. Weak convergence for empirical processes of associated sequences. Ann Inst Henri Poincaré Probabilités Statist. 2000;36(5):547–567]. 相似文献
3.
4.
After smoking, exposure to radon and its progeny is the second leading cause of lung cancer. The probability of inducing lung carcinomas by inhaled radon progeny depends on the deposited radiation dose, and is significantly affected by physiological and morphometric changes induced by smoking. Due to irritation of the airways, the inhalation of cigarette smoke leads to the hyperproduction of mucus. Two concurrent processes occur: on one hand, increased production of mucus protects the target cells against radiation damage; on the other hand, in the case of long-term smokers, a chronic lung obstruction develops, causing an increase in the radiation dose to the lungs. Depending on the duration and intensity of smoking, these processes contribute to the final radiation dose with different weights. The primary objective of this study was to investigate to what extent these smoke-induced changes can modify the resulting absorbed dose of inhaled radon progeny relative to healthy nonsmokers. Since the bronchial dose depends on the degree of lung tissue damage, we have used this dose as a tool for detecting the effects of smoking on the lung epithelium. In other words, the biological effect of radon served as a tracer of changes induced by smoking. 相似文献
5.
6.
This paper investigates the relationship between economic and environmental performance with focus on firms in an emerging
economy, the Czech Republic, and their CO2 emission reductions. We discuss whether the hypotheses tested for local pollutants that firms emit and firms’ finances are
relevant for CO2 emissions. We test the hypotheses on a sample of Czech firms included in the first phase of European Union Emissions Trading
Scheme (EU ETS). We observe that introduction of EU ETS did not encourage significant investments in CO2 emissions reduction. Importantly, the results show that the firms that did invest in CO2 reductions experienced a negative impact on their finance. We argue that this is explained by the drop in the price of allowances
on the carbon market in 2006 which resulted in firms receiving less revenue from saved allowances than they had expected. 相似文献
7.
This paper analyses changes in the representation of alien taxa in ruderal vegetation of a model urban ecosystem. Two datasets of phytosociological relevés of ruderal communities from the area of Malacky (a city in southwestern Slovakia) were analysed. The relevés were recorded 50 years apart, the old relevés were recorded in the years 1954–1969 and the more recent relevés in the years 2014–2015. The average values of percentage number and percentage cover of archaeophytes and neophytes as groups in old and more recent datasets were compared. We also calculated the proportion of each taxon of archaeophytes and neophytes in ruderal vegetation in both periods. The results revealed a decrease in the average percentage number and percentage cover of archaeophytes in almost all classes of ruderal vegetation between the new and old dataset. On the contrary, an increase in representation of neophytes in all classes was recorded. Some rare taxa of archaeophytes were only recorded 50 years ago (e.g. Veronica opaca, Xanthium stumarium), while many taxa of neophytes (including some invasive taxa e.g. Ambrosia artemisiifolia, Stenactis annua) were only recorded in the years 2014–2015 in the ruderal vegetation of the urban ecosystem of Malacky. 相似文献
8.
Dana Sýkorová 《European Journal of Social Work》2002,5(2):123-138
This paper sums up the results of empirical research into the intergenerational solidarity in Czech families which should help to answer the question whether the family or the kinship system can discharge their self-supportive potential adequately under the pressures of the transformation processes during the 1990s. It also describes the macro-social framework, i.e. the socio-political, economic and demographic context that influences the quantitative and qualitative aspects of kinship assistance. Overall, the paper provides a general picture of informal support systems as the basis for the specific recommendation for practical social work. 相似文献
9.
José Andrés Fernández-Cornejo Lorenzo Escot Jane Kabubo-Mariara Bethuel Kinyanjui Kinuthia Guðný Björk Eydal Tómas Bjarnason 《Journal of youth studies》2016,19(4):457-482
This article addresses the question of to what extent young people show an inclination to accept some sacrifice in their career progression in the future in order to reach a better work–family balance. Data come from a survey conducted among a sample of 2383 university students who attended three universities: University of Nairobi, University of Iceland, and Complutense University of Madrid. After building a set of indicators about career and family involvement aspirations of respondents, and after conducting a statistical and regression analysis, this research shows that young women (on average) still have a greater predisposition than young men to make sacrifices in the future in their working careers in order to achieve a better work–family balance. Moreover, having a high degree of leadership aspirations and belonging to an egalitarian household tend to reduce the inclination to sacrifice career opportunities, whereas having a high inclination to be involved in childcare in the future and having the perception of a future work–family conflict tend to increase it. Gender attitudes have a differential effect on female and male students: having traditional gender attitudes tends to increase the inclination to sacrifice career opportunities in the case of female students and reduce it in the case of male students. 相似文献
10.
Rendeková Alena Mičieta Karol Randáková Zuzana Ballová Dominika Eliašová Mariana Miškovic Ján 《Urban Ecosystems》2020,23(4):875-891
Urban Ecosystems - Tram and railway tracks represent specific urban habitats, which host a specific type of flora. This study aims to compile the information about species composition of flora of... 相似文献