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21.
A comparison of institutional enrollment data and counseling center service utilization data at 66 universities showed that neither ethnic minority students nor European American students under‐ or overutilized counseling services (Study 1). Data from Study 2 examining students in the general campus bodies at 45 institutions indicated that utilization of counseling center services for students of various ethnicities was predicted by the ethnic composition of the counseling center staff. Among students of color, utilization of campus counseling services was predicted by greater psychological distress, less family support, and a history of previous psychological problems.  相似文献   
22.
In the United States, public television claims itself a champion of localism. A prime-time schedule analysis of the Public Broadcasting Service's (PBS) member stations establishes localism scores, and discriminant analysis finds variables that predict differences among stations. Market level variables (income, education, ethnic diversity, geographic component) and organizational level variables (Community Service Grants, membership funding, overall revenue) affect localization of member stations' schedules. This is the first empirical study utilizing a structural operationalization of localism, inclusive of all programming genres, applied to PBS member stations.  相似文献   
23.
The search for valid selection instruments to act as a screen for potential teachers is not a new concern. In the past, the concern was not matched by resources diverted to their development or by an adequate fund of knowledge and skill necessary for developing such instruments. Also conventional wisdom has it that the traditional criteria of teacher selection based on levels of educational attainment would be adequate to ensure that candidates selected for teacher education would be able to measure up to the demands of the teaching task.  相似文献   
24.
Developments in reading research in the last two decades have led to a fuller understanding of the reading process and enabled researchers and practitioners to address the issue of how to improve the teaching of reading comprehension. This paper reviews some of the studies in general classroom instructional research and reading comprehension instruction. It then reports an observation study of reading comprehension instruction carried out by IE student teachers. The findings of the study are discussed in the light of similar studies reviewed in the earlier section of the paper, and implications for classroom practice and further research are suggested.  相似文献   
25.
Lord's Wald test for differential item functioning (DIF) has not been studied extensively in the context of the multidimensional item response theory (MIRT) framework. In this article, Lord's Wald test was implemented using two estimation approaches, marginal maximum likelihood estimation and Bayesian Markov chain Monte Carlo estimation, to detect uniform and nonuniform DIF under MIRT models. The Type I error and power rates for Lord's Wald test were investigated under various simulation conditions, including different DIF types and magnitudes, different means and correlations of two ability parameters, and different sample sizes. Furthermore, English usage data were analyzed to illustrate the use of Lord's Wald test with the two estimation approaches.  相似文献   
26.
Low mathematics achievement is a persistent problem in the United States, and multiplication is a fundamental area in which many students manifest learning difficulties. This study examined the strategic developmental levels of multiplication problem solving among 121 elementary school students in Grades 3 through 5. A latent class analysis modeling was used to identify three valid groups representing different patterns of strategy choices for each of three types of multiplication problems. Findings indicated intra-group variability for problem-solving accuracy, for frequency of using different strategies, and for accuracy of executing direct retrieval/algorithm (DR/AG) strategies. Students demonstrated relative consistency in their strategy choices for solving the three problem types. Students who used DR/AG strategies most frequently showed the highest problem-solving accuracy and the highest accuracy of executing the DR/AG strategies. Students who most frequently relied on incorrect operations or who indicated they did not know how to solve problems demonstrated the lowest problem-solving accuracy among the three groups; the number of students in this group increased with problem difficulty levels. Implications are discussed in terms of identifying students' strategic developmental levels and providing differentiated instruction based on the identified levels.  相似文献   
27.
This multiwave longitudinal study tested two quantitative genetic developmental models to examine genetic and environmental influences on exposure to negative dependent and independent life events. Participants (= 457 twin pairs) completed measures of life events annually from ages 9 to 16. The same genetic factors influenced exposure to dependent events across time and increased in magnitude during the transition to adolescence. Independent events were less genetically influenced than dependent events in boys, but not girls. Shared environmental influences decreased in magnitude as youth transitioned into adolescence. Nonshared environmental influences were mostly age specific and contributed significantly to both types of events at all ages. Results provide theoretical implications for developmental risk pathways to stress exposure and stress‐related psychopathology.  相似文献   
28.
We explored the experiences and emotions women expressed about having a blood clot, including revelations about family members' decision to avoid disclosing inherited risk for clotting. We do this through analysis of in-depth life reflection interviews (N = 20) of women who experienced a first venous blood clot between the ages of 18 and 50 years. Selective coding reduced the data to an overarching story associated with thrombosis survivorship and loss across multiple life domains. The themes identified include participant revelations about living in the shadow of genetic susceptibility for thrombosis. Participants manage changes associated with lingering health effects, and daily routines for work and life, adapting their lives to manage coagulability. A second theme reveals the fallout linked to the severity of thrombosis encompassed in haunting psychological scenarios, persistent emotional concerns, and social discrimination. Participants assumed responsibility to disclose inherited risk, with the women expressing empowerment in knowing risks and acknowledging possible genetic testing mistakes. The overarching perspective was one of hope through proactive actions in occupational, recreational, and relational realms. We offer our findings as a theoretical depiction of thrombosis survivor identity and the need for public health and clinical communication to support disclosing family history for clotting.  相似文献   
29.

In the present study, we describe a participating student’s (Carol’s) distributive partitioning scheme and operations along with Steffe’s and his colleagues’ studies about children’s constructions of fraction knowledge as a particular model of mathematical learning. Analysis of Carol’s mathematical behaviors indicates that an operationally common mathematical behavior (distributive partitioning operation) was revealed in various mathematical problem situations such as fraction multiplication, fraction division, and multiplicative transformation between fractional quantities. It both provides a rationale for why becoming versed in one mathematical subject could facilitate working with another mathematical subject and also implies the necessity of describing and defining students’ mathematical behaviors from an operational view of knowledge, which might lead to building foundations of a substantial cognitive map for students’ mathematical development.

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30.
Interest in single-cell analysis has increased because it allows to understand cell metabolism and characterize disease states, cellular adaptation to environmental changes, cell cycles, etc. Here, the authors propose a device to electrically trap and lyse single-bacterial cells in an array format for high-throughput single-cell analysis. The applied electric field is highly deformed and concentrated toward the inside of the microwell structures patterned on the planar electrode. This configuration effectively generates dielectrophoretic force to attract a single cell per well. The microwell has a comparable size to the target bacterial cell making it possible to trap single cells by physically excluding additional cells. Inducing highly concentrated electric potential on the cell membrane can also effectively lyse the trapped single-bacterial cells. The feasibility of the authors' approach was demonstrated by trapping and lysing Escherichia coli cells at the single-cell level. The present microwell array can be used as a basic tool for individual bacterial cell analysis.  相似文献   
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