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41.
Ignacio Palacios‐Huerta Oscar Volij 《Econometrica : journal of the Econometric Society》2004,72(3):963-977
This paper examines the problem of measuring intellectual influence based on data on citations between scholarly publications. We follow an axiomatic approach and find that the properties of invariance to reference intensity, weak homogeneity, weak consistency, and invariance to splitting of journals characterize a unique ranking method. This method is different from those regularly used in economics and other social sciences. 相似文献
42.
Schneiberg Israel Boscolo Danilo Devoto Mariano Marcilio-Silva Vinicius Dalmaso Cilmar Antônio Ribeiro John Wesley Ribeiro Milton Cezar de Camargo Guaraldo André Niebuhr Bernardo Brandão Varassin Isabela Galarda 《Urban Ecosystems》2020,23(3):457-470
Urban Ecosystems - Anthropogenic activities are the main cause of habitat loss and fragmentation, which directly affects biodiversity. Disruption in landscape connectivity among populations may... 相似文献
43.
Pagnan AS Ribeiro GF Gonçalves MG Câmara JJ Baptista SM 《Work (Reading, Mass.)》2012,41(Z1):1524-1530
Contemporary electronic industry offers a wide range of products. Usually touch sensitive and with few buttons and a lot of functions these products not always have a friendly interface. The human x design interface based on electronics' ergonomics is the focus of this research. An evolutionary analysis of the electronics industry design within a contemporary context clarifies this relation and proposes new guidelines for a more conscious design. 相似文献
44.
Amarendra SHARMA Oscar CÁRDENAS 《International labour review / International Labour Office》2018,157(2):193-212
The effects of remittances on labour market outcomes have been studied by many researchers, primarily using micro‐level data. While a few studies have also used macro‐level data, they suffer from endogeneity bias due to the inclusion of remittances in their estimations. The present study attempts to fill the gap in the literature by using a set of panel data of Mexican states and by addressing the endogeneity bias with a system GMM (generalized method of moments) estimator. The main conclusions are that remittances increase labour force participation rates and reduce median hours worked, critical employment and unemployment duration. 相似文献
45.
Erna Gelles Meg Merrick Sean Derrickson Felesia Otis Oscar Sweeten‐Lopez Jamaal Tripp Folsom 《Nonprofit management & leadership》2009,19(4):523-548
This article explores theoretical underpinnings of social capital and strong and weak ties as they relate to relationships within, between, and among six cohorts of promising nonprofit leaders of color in a northwestern U.S. city. Using mixed methods, including network analyses, it considers the impact and potential of a university‐community collaboration to deliver a program to promising emergent leaders nominated for their talent and commitment to the work of their community‐based organizations, often in competition for limited resources. The article considers the program's implicit effect on relationships and reveals intersector connections among alumni. Findings show substantial alumni movement among organizations, increasing the potential for collaboration and mentoring relationships. We conclude with recommendations for programs seeking long‐term impact and discuss a series of unanticipated findings and the questions they engender, many critical as communities and organizations become more diverse and social needs do not diminish. 相似文献
46.
Carolina Costa Mota Paraíba Carlos Alberto Ribeiro Diniz Aline de Holanda Nunes Maia Lineu Neiva Rodrigues 《统计学通讯:理论与方法》2017,46(15):7355-7374
We present a class of truncated non linear regression models for location and scale where the truncated nature of the data is incorporated into the statistical model by assuming that the response variable follows a truncated distribution. The location parameter of the response variable is assumed to be modeled by a continuous non linear function of covariates and unknown parameters. In addition, the proposed model also allows for the scale parameter of the responses to be characterized by a continuous function of the covariates and unknown parameters. Three particular cases of the proposed models are presented by considering the response variable to follow a truncated normal, truncated skew normal, and truncated beta distribution. These truncated non linear regression models are constructed assuming fixed known truncation limits and model parameters are estimated by direct maximization of the log-likelihood using a non linear optimization algorithm. Standardized residuals and diagnostic metrics based on the cases deletion are considered to verify the adequacy of the model and to detect outliers and influential observations. Results based on simulated data are presented to assess the frequentist properties of estimates, and a real data set on soil-water retention from the Buriti Vermelho River Basin database is analyzed using the proposed methodology. 相似文献
47.
Drawing on data from in-depth personal interviews with a sample of fifty-three older men caring for their impaired wives, authors report findings on these men's caregiving experience, specifically on the way they see themselves as men within such role. Through analytic methods based upon content analysis and open coding, authors found that when describing their gendered understanding of themselves participants evidenced several negotiations with the dominant masculine ideology in order to maintain their sense of masculinity and legitimate their presence in a feminine role. This was accomplished by reframing their definition of a man and reinforcing that of a husband and by retaining varying degrees of power over the caregiving relationship. The social visibility of the role within particular gendered community-based social networks was found to be important in shaping these older men's masculinities. 相似文献
48.
Tuyosi Sugimoto Oscar P. J. M. Minkenberg Junji Takabayashi Marcel Dicke Joop C. van Lenteren 《Researches on Population Ecology》1990,32(2):381-389
Summary We studied the rules used by the female parasitoid,Dacnusa sibirica Telenga (Hymenoptera: Braconidae), for deciding when to leave a tomato leaflet on which she is searching for larvae of the
leafminer,Liriomyza bryoniae Kalt. (Diptera: Agromyzidae). Females would deposit a marking pheromone on the leaflet and would leave the leaflet when the
amount of the pheromone accumulated to the thresholdL, which is proportional to the amount of search effort on the leaflet.L appears to increase with host density since it rises after every encounter with a host (or mine).D. sibirica would employ an area-concentrated search, which is advantageous in foraging for hosts showing a clumped distribution. 相似文献
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