排序方式： 共有73条查询结果，搜索用时 61 毫秒
41.
Barbara L. Nowicki Barbara Sullivan-Watts Minsuk K. Shim Betty Young Robert Pockalny 《Research in Science Education》2013,43(3):1135-1154
Elementary teachers face increasing demands to engage children in authentic science process and argument while simultaneously preparing them with knowledge of science facts, vocabulary, and concepts. This reform is particularly challenging due to concerns that elementary teachers lack adequate science background to teach science accurately. This study examined 81 in-classroom inquiry science lessons for preservice education majors and their cooperating teachers to determine the accuracy of the science content delivered in elementary classrooms. Our results showed that 74 % of experienced teachers and 50 % of student teachers presented science lessons with greater than 90 % accuracy. Eleven of the 81 lessons (9 preservice, 2 cooperating teachers) failed to deliver accurate science content to the class. Science content accuracy was highly correlated with the use of kit-based resources supported with professional development, a preference for teaching science, and grade level. There was no correlation between the accuracy of science content and some common measures of teacher content knowledge (i.e., number of college science courses, science grades, or scores on a general science content test). Our study concluded that when provided with high quality curricular materials and targeted professional development, elementary teachers learn needed science content and present it accurately to their students. 相似文献
42.
Sangjo Shim Katherine Stemke-Hale Jamileh Noshari Frederick F. Becker Peter R. C. Gascoyne 《Biomicrofluidics》2013,7(1)
The number of circulating tumor cells (CTCs) found in blood is known to be a prognostic marker for recurrence of primary tumors, however, most current methods for isolating CTCs rely on cell surface markers that are not universally expressed by CTCs. Dielectrophoresis (DEP) can discriminate and manipulate cancer cells in microfluidic systems and has been proposed as a molecular marker-independent approach for isolating CTCs from blood. To investigate the potential applicability of DEP to different cancer types, the dielectric and density properties of the NCI-60 panel of tumor cell types have been measured by dielectrophoretic field-flow fractionation (DEP-FFF) and compared with like properties of the subpopulations of normal peripheral blood cells. We show that all of the NCI-60 cell types, regardless of tissue of origin, exhibit dielectric properties that facilitate their isolation from blood by DEP. Cell types derived from solid tumors that grew in adherent cultures exhibited dielectric properties that were strikingly different from those of peripheral blood cell subpopulations while leukemia-derived lines that grew in non-adherent cultures exhibited dielectric properties that were closer to those of peripheral blood cell types. Our results suggest that DEP methods have wide applicability for the surface-marker independent isolation of viable CTCs from blood as well as for the concentration of leukemia cells from blood. 相似文献
43.
Longobardi Claudio Ferrigno Serena Gullotta Giulia Jungert Tomas Thornberg Robert Marengo Davide 《European Journal of Psychology of Education - EJPE》2022,37(2):489-506
Highly responsive teachers tend to foster behaviors that are low in conflict and high in prosociality, among their students, leading to a positive classroom climate and to a decrease in bullying victimization. However, little is known about the interaction between teacher responsiveness and both student–teacher, and student–student relationship characteristics, in influencing students’ bullying victimization at school. Here, we examined student–teacher relationship quality and students’ likeability among peers as predictors of in-school victimization. Additionally, we investigated the moderating role of teacher responsiveness over this link. Study sample consisted of 386 early-adolescent students (55.2% female, mean age [SD] = 12.17 [0.73]) and 19 main teachers (females, n = 14). Findings indicated that students’ exposure to victimization was positively associated with student–teacher conflict and negatively associated with likeability among classroom peers. Teacher responsiveness did not show a significant direct association with bullying victimization. However, when teachers showed high responsiveness, the strength of the association between student–teacher conflict and students’ likelihood of bullying victimization was slightly increased. The present study highlights the importance of considering the role of teacher responsiveness when modeling the link between student and teacher relationship quality and in school bullying victimization.
相似文献44.
Even though isoelectric focusing (IEF) is a very useful technique for sample concentration and
separation, it is challenging to extract separated samples for further processing. Moreover, the
continuous sample concentration and separation are not possible in the conventional IEF. To overcome
these challenges, free flow IEF (FFIEF) is introduced in which a flow field is applied in the
direction perpendicular to the applied electric field. In this study, a mathematical model is developed for FFIEF to understand
the roles of flow and
electric fields for
efficient design of microfluidic
chip for continuous separation of proteins from an initial well mixed solution. A finite volume based
numerical scheme is implemented to simulate two dimensional FFIEF in a microfluidic chip. Simulation results
indicate that a pH gradient forms as samples flow downstream and this pH profile agrees well with
experimental results validating our model. In addition, our simulation results predict the experimental behavior of
pI markers in a FFIEF microchip. This numerical model is used to predict the separation
behavior of two proteins
(serum albumin and cardiac troponin I) in a two-dimensional straight microchip. The effect of
electric field is
investigated for continuous separation of proteins. Moreover, a new channel design is presented to increase the separation
resolution by introducing cross-stream flow velocity. Numerical results indicate that the separation
resolution can be improved by three folds in this new design compare to the conventional straight
channel design. 相似文献
45.
Serena Lecce Federica Bianco Patrizia Demicheli Elena Cavallini 《Child development》2014,85(6):2404-2418
This study investigated the relation between theory of mind (ToM) and metamemory knowledge using a training methodology. Sixty‐two 4‐ to 5‐year‐old children were recruited and randomly assigned to one of two training conditions: A first‐order false belief (ToM) and a control condition. Intervention and control groups were equivalent at pretest for age, parents' education, verbal ability, inhibition, and ToM. Results showed that after the intervention children in the ToM group improved in their first‐order false belief understanding significantly more than children in the control condition. Crucially, the positive effect of the ToM intervention was stable over 2 months and generalized to more complex ToM tasks and metamemory. 相似文献
46.
Allan B. de Guzman Hye-Eun Shim Charmin Kathleen M. Sia Wilbart Harvey S. Siazon Mary Joyce Ann P. Sibal Joanna Brigitte Lorraine C. Siglos 《Educational gerontology》2013,39(4):265-291
Ego integrity, the last developmental task in Erikson's psychological theory, develops naturally among older people. However, the presence of loss–like physical disability–can considerably affect the quality of life, interactions, and well being of older adults. Hence, older people with physical disabilities need more assistance in accomplishing tasks of ego integrity. This study aimed to utilize traditional Filipino art to capture the essence of the lived experiences of a select group of older people with physical disabilities in relation to their ego integrity. Four Filipino elderly with physical disabilities were purposely selected for this study. Picture prompting and doodling sessions were held as pretest and posttest to ascertain the effectiveness of puni-making in facilitating ego integrity of participants. A series of interviews were pursued to elicit experiences and feelings of participants regarding their disability and old age. From the analysis of the triangulated set of data, two findings emerged. First, four activators of ego integrity, namely: work, family, belief in self and belief in God, were identified as essentials in the formation of the participants' ego-integrity. Second, shifts related to the activators were identified indicating ego integrity's source, meaning and connection elements have become more grounded, certain and integrated. The influence of puni-making in understanding the ego integrity of older people with disabilities was found to be a sound and novel recreational therapy. It can stimulate a select group of Filipino elderly for openness to share their subjective and yet illuminating life experiences. 相似文献
47.
Jenna Min Shim 《课程研究杂志》2013,45(6):739-758
At the current historical juncture in which differences and inequalities are surfacing greater than ever in the world, societies, and schools, the main goal of this essay is to revisit the aspects of structuralism that can potentially contribute productively to understanding the invisible structures and forces that everyone carries (mostly unknowingly) with them at all times and in all places including in multicultural curricular and social justice work. By doing so, this essay also attempts to dispute with liberal humanistic notions of the self (teachers and students) in multicultural curricular studies that continues to support the dominant framework of curriculum. This essay is grounded on the idea that progressive change is predicated on (although never guaranteed by) uncovering and understanding as fully as possible the social, political, and economic organization of the world, which is always mediated by individual selves who are located within the world in specific ways. 相似文献
48.
Minsun Shim 《亚洲交流杂志》2015,25(1):48-64
Much research on risk perception and health behavior has examined cognitive dimensions of risk but not affective dimensions. To address this gap, this study examines both cognitive risk perception (perceived risk of susceptibility and severity) and affective risk perception (worry) in the context of food safety risks in East Asia. We investigate their roles in independently and jointly predicting intention to consume outbreak-associated food products, as well as mediating the influences of news exposure and attention on intention. Data from a nationwide survey in South Korea (N = 1500) lent overall support for our hypotheses in both cases of processed food from China and seafood from Japan. Our findings show: (1) both perceived risk and worry were negatively associated with food consumption intention, and the association between perceived risk and intention was stronger among those higher in worry; (2) news attention had stronger associations with perceived risk and worry than news exposure, and attention moderated the relationship between news exposure and perceived risk; and (3) perceived risk and worry mediated the associations between news use and food consumption intention. Implications and limitations of the findings are discussed. 相似文献
49.
This paper presents qualitative findings about the search behaviors and research habits of students interviewed at six college and university campuses in the US. Our findings suggest that students’ strategies are influenced by both their non-academic search experiences as well as the broader academic context of their research tasks. Their behaviors suggest an on-going negotiation of these influences, evidenced by the ways they incorporate Google into their research strategy while still closely adhering to faculty instruction for using library resources. Students bring a strong sense of self-reliance to the research process, yet they still experience many barriers and pain points accessing library resources. We have included recommendations for librarians and faculty who, by better understanding the journey of an academic researcher, can work in concert to reduce the barriers and increase the success of students’ research efforts. 相似文献
50.
Evaluation of a lower-body compression garment 总被引：1，自引：0，他引：1
Doan BK Kwon YH Newton RU Shim J Popper EM Rogers RA Bolt LR Robertson M Kraemer WJ 《Journal of sports sciences》2003,21(8):601-610
The aims of this study were to determine how custom-fit compression shorts affect athletic performance and to examine the mechanical properties of the shorts. Ten male and 10 female track athletes on a university's nationally competitive track team, specializing in sprint or jump events, participated in the study. Testing utilized the compression shorts with loose-fitting gym shorts as the control garment. Several significant effects were revealed for the custom-fit compressive garment. Although 60 m sprint time was not affected, hip flexion angle was reduced. Skin temperature increased more and at a faster rate during a warm-up protocol. Muscle oscillation was decreased during vertical jump landing. Countermovement vertical jump height increased when the participants were wearing the custom-fit compression garment. In materials testing, the elasticity of the compressive garment provides increased flexion and extension torque at the end range of extension and flexion, respectively, and may assist the hamstrings in controlling the leg at the end of the swing phase in sprinting. The compressive garment significantly reduced impact force by 27% compared with American football pants alone. Through various mechanisms, these findings may translate into an effect on athletic performance and a reduction in injuries. 相似文献