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The aim of this article is to examine how older people mobilise sources of strength, often denoted under the concept of resilience, to maintain mastery over their lives in the context of significant threats to their function. Departing from a relational approach to resilience, we focus on how they cooperate and interact with significant others to achieve their personal goals. This is illustrated by the narratives of two older women. The concept of resilience helps us to reflect on their stories and to gain an in-depth understanding of the mediating sources of strength older people rely on when encountering the losses associated with old age. The narratives of the women show that what on the surface appears to be a similar burden to a life or function, turned out to be interpreted and responded to in a different way. Maintaining mastery in old age is a symbolic and interactional process, and a shared responsibility for older persons and their social environment. Important mediating sources of strength that turn out to influence positively one's sense of mastery include a positive perception of one's situation, openness about one's vulnerability and responsiveness to help. In order to promote older people's sense of mastery, significant others need to approach them in a positive way, by being aware of the way support is offered, by believing in their potential and strength and by allowing reciprocity in the relationship. When these conditions are fulfilled, it becomes possible to enter into a constructive dialogue and recommendations can be developed – in terms of treatment – that are consistent with the older persons' values and expectations.  相似文献   
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Many empirical studies which deal with internal labour markets are related to the work of Doeringer and Piore (1971). The majority of these studies cannot find closed internal labour markets with entry positions at the lower end of a firm’s hierarchy. Most of these studies, however, use data from financial and service industries, managerial or other white-collar workers. Doeringer and Piore (1971) state that closed internal labour markets with clearly defined entry positions should be found especially for blue-collar workers in the manufacturing industry, because firm specific human capital is of large importance in these industries. In this paper, a large data set of a manufacturing company with blue-collar and white-collar workers is used. We show that the internal labour market of blue-collar workers is more closed than that of white-collar workers. Moreover, we find that firm specific human capital plays a major role in determining the hierarchical position of blue-collar workers. Entries of white-collar workers, however, appear at all hierarchical positions. Furthermore, formal education plays a major role in allocating the white-collar workers.  相似文献   
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The introduction of invasive species causes damages from the economic and ecological point of view. Interception of plant pests and eradication of the established populations are two management options to prevent or limit the risk posed by an invasive species. Management options generate costs related to the interception at the point of entry, and the detection and eradication of established field populations. Risk managers have to decide how to allocate resources between interception, field detection, containment, and eradication minimizing the expected total costs. In this work is considered an optimization problem aiming at determining the optimal allocation of resources to minimize the expected total costs of the introduction of Bemisia tabaci‐transmitted viruses in Europe. The optimization problem takes into account a probabilistic model for the estimation of the percentage of viruliferous insect populations arriving through the trade of commodities, and a population dynamics model describing the process of the vector populations' establishment and spread. The time of field detection of viruliferous insect populations is considered as a random variable. The solution of the optimization problem allows to determine the optimal allocation of the search effort between interception and detection/eradication. The behavior of the search effort as a function of efficacy or search in interception and in detection is then analyzed. The importance of the vector population growth rate and the probability of virus establishment are also considered in the analysis of the optimization problem.  相似文献   
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Markets can show different types of dynamics, from quiet markets dominated by one or few products, to markets with constant penetration of new and reintroduced products. This paper explores the dynamics of markets from a psychological perspective using a multi-agent simulation model. The behavioural rules of the artificial consumers, the consumats, are based on a conceptual meta-theory from psychology. The artificial consumers have to choose each period between similar products. Products remain in the market as long as they maintain a minimum level of market share, else they will be replaced by a new product. Assuming a population of consumats with different preferences, and social networks, the model simulates adoption of new products for alternative assumptions on behavioural rules. Furthermore, the consequences of changing preferences and the size of social networks are explored. Results show that the behavioural rules that dominate the artificial consumer's decision making determine the resulting market dynamics, such as fashions, lock-in and unstable renewal. Results also show the importance of psychological variables like social networks, preferences and the need for identity to explain the dynamics of markets.  相似文献   
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We examine the variations in the pace of old-age (80+) mortality decline in seven European countries, from 1950 to 1999. Marked variations were found between countries, periods and sexes. While mortality declines were strong in France and England and Wales, modest or no mortality declines were seen in the 1950s and 1960s in the Nordic countries, and since the 1980s in Denmark, the Netherlands and Norway (men only). For non-smoking-related mortality, a high and consistent pace of mortality decline was observed. Mortality decline stagnated among men born between 1890 and 1899, but persisted among women born between 1847 and 1937. The pace of old-age mortality decline correlated with the pace of mortality decline at ages 60–69 among the same cohorts, but only among men and not for non-smoking-related mortality. Smoking, thus, seems more important than other factors originating earlier in life. Our results furthermore indicate substantial future declines in old-age mortality.  相似文献   
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In this research we explored three aspects of personality relevant to sexual activity and sexual risk taking in heterosexual men. Men with low inhibition of sexual arousal in the face of risk (low SIS2) reported more partners with whom they use no condoms and more lifetime "one night stands." Men who experience increased sexual interest in states of depression (MSQ) reported more partners in the past year and more one night stands. The disinhibition subscale of the Sensation Seeking Scale was predictive of whether sexual intercourse had occurred in the past 6 months, and also of the number of sexual partners in the past year. A measure of an intention to practice safer sex was strongly related to measures of sexual arousability and inhibition (SIS/SES). We discuss some clear similarities and also some interesting differences with a parallel study of gay men. Individual differences in sexual excitation and inhibition proneness and the relation between mood and sexuality are clearly relevant to high-risk sexual behavior and should be taken into consideration when designing behavioral interventions.  相似文献   
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Increasing identification of transmissions of emerging infectious diseases (EIDs) by blood transfusion raised the question which of these EIDs poses the highest risk to blood safety. For a number of the EIDs that are perceived to be a threat to blood safety, evidence on actual disease or transmission characteristics is lacking, which might render measures against such EIDs disputable. On the other hand, the fact that we call them “emerging” implies almost by definition that we are uncertain about at least some of their characteristics. So what is the relative importance of various disease and transmission characteristics, and how are these influenced by the degree of uncertainty associated with their actual values? We identified the likelihood of transmission by blood transfusion, the presence of an asymptomatic phase of infection, prevalence of infection, and the disease impact as the main characteristics of the perceived risk of disease transmission by blood transfusion. A group of experts in the field of infectious diseases and blood transfusion ranked sets of (hypothetical) diseases with varying degrees of uncertainty associated with their disease characteristics, and used probabilistic inversion to obtain probability distributions for the weight of each of these risk characteristics. These distribution weights can be used to rank both existing and newly emerging infectious diseases with (partially) known characteristics. Analyses show that in case there is a lack of data concerning disease characteristics, it is the uncertainty concerning the asymptomatic phase and the disease impact that are the most important drivers of the perceived risk. On the other hand, if disease characteristics are well established, it is the prevalence of infection and the transmissibility of the disease by blood transfusion that will drive the perceived risk. The risk prioritization model derived provides an easy to obtain and rational expert assessment of the relative importance of an (emerging) infectious disease, requiring only a limited amount of information. Such a model might be used to justify a rational and proportional response to an emerging infectious disease, especially in situations where little or no specific information is available.  相似文献   
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Research about masturbation tends to be limited to the assessment of masturbation incidence and frequency. Consequently, little is known about what people experience connected to masturbation. This might be one reason why theoretical approaches that specifically address the persistent gender gap in masturbation frequency are lacking. The aim of the current study was to explore several aspects of masturbation in young men and women, and to examine possible associations with their social backgrounds and sexual histories. Data from 1,566 women and 1,452 men (ages 18 to 22) from 52 Swedish senior high schools were analyzed. Comparisons between men and women were made regarding incidence of and age at first masturbation, the use of objects (e.g., sex toys), fantasies, and sexual functioning during masturbation, as well as about their attitudes toward masturbation and sexual fantasies. Cluster analysis was carried out to identify similarities between and differences within the gender groups. While overall more men than women reported experience with several of the investigated aspects, cluster analyses revealed that a large proportion of men and women reported similar experiences and that fewer experiences are not necessarily associated with negative attitudes toward masturbation. Implications of these findings are discussed in consideration of particular social backgrounds.  相似文献   
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