-013Hydrothermal Preparation and Characterization of Luminescent CdWO 4 Nanorods.-CdWO 4 nanorods with diameters of 20-40 nm and lengths ranging from 80 to 280 nm are prepared hydrothermally from CdCl 2 and NaWO 4 (H 2 O, autoclave, 130 • C, 5 h, pH 3.0-14.0). The samples are characterized by powder XRD and TEM. They show a very strong photoluminescence peak at 486 nm with the excitation wavelength 253 nm. The intensity of the photoluminescence emission strongly depends on the preparation conditions.

This article proposes algorithms for evaluating XPath queries over an XML tree that is partitioned horizontally and vertically, and is distributed across a number of sites. The key idea is based on partial evaluation: it is to send the whole query to each site that partially evaluates the query, in parallel, and sends the results as compact (Boolean) functions to a coordinator that combines these to obtain the result. This approach possesses the following performance guarantees. First, each site is visited at most twice for data-selecting XPath queries, and only once for Boolean XPath queries. Second, the network traffic is determined by the answer to the query, rather than the size of the tree. Third, the total computation is comparable to that of centralized algorithms on the tree stored in a single site, regardless of how the tree is fragmented and distributed. We also present a MapReduce algorithm for evaluating Boolean XPath queries, based on partial evaluation. In addition, we provide algorithms to evaluate XPath queries on very large XML trees, in a centralized setting. We show both analytically and empirically that our techniques are scalable with large trees and complex XPath queries. These results, we believe, illustrate the usefulness and potential of partial evaluation in distributed systems as well as centralized XML stores for evaluating XPath queries and beyond.

ObjectiveTo explore the impact of Core self-evaluations on job burnout of nurses, and especially to test and verify the mediator role of organizational commitment between the two variables.MethodRandom cluster sampling was used to pick up participants sample, which consisted of 445 nurses of a hospital in Shanghai. Core self-evaluations questionnaire, job burnout scale and organizational commitment scale were administrated to the study participants.ResultsThere are significant relationships between Core self-evaluations and dimensions of job burnout and organizational commitment. There is a significant mediation effect of organizational commitment between Core self-evaluations and job burnout.ConclusionsTo enhance nurses’ Core self-evaluations can reduce the incidence of job burnout.

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