排序方式： 共有19条查询结果，搜索用时 78 毫秒
1.
Ernst A. Hany 《High Ability Studies》1993,4(2):196-211
Previous investigations have shown that teachers have a clear idea of the typical characteristics of gifted pupils. The present study investigates whether these features are combined linearly or whether they are used to activate pupil exemplars or prototypes stored in the longterm memory, when teachers are set the task of distinguishing gifted from above average pupils. A group of 37 teachers at grammar schools in the German federal state of Baden‐Württemberg, who had all had adequate experience with gifted children, answered written questions. Their judgement behaviour was modelled with the help of discriminant analyses in which a number of different predictor sets were included. These analyses revealed that both individual features and prototypical patterns of features seem to be used simultaneously. In contrast, personal experience with individual highly gifted pupils seemed not to play any role, although the method used could be expected to conceal the effects of personal experience. 相似文献
2.
We introduce a new model for contact angle saturation phenomenon in electrowetting on dielectric systems. This new model attributes contact angle saturation to repulsion between trapped charges on the cap and base surfaces of the droplet in the vicinity of the three-phase contact line, which prevents these surfaces from converging during contact angle reduction. This repulsion-based saturation is similar to repulsion between charges accumulated on the surfaces of conducting droplets which causes the well known Coulombic fission and Taylor cone formation phenomena. In our model, both the droplet and dielectric coating were treated as lossy dielectric media (i.e., having finite electrical conductivities and permittivities) contrary to the more common assumption of a perfectly conducting droplet and perfectly insulating dielectric. We used theoretical analysis and numerical simulations to find actual charge distribution on droplet surface, calculate repulsion energy, and minimize energy of the total system as a function of droplet contact angle. Resulting saturation curves were in good agreement with previously reported experimental results. We used this proposed model to predict effect of changing liquid properties, such as electrical conductivity, and system parameters, such as thickness of the dielectric layer, on the saturation angle, which also matched experimental results. 相似文献
3.
Erika Felix Eric M. Vernberg Rose L. Pfefferbaum Dodie C. Gill John Schorr Angela Boudreaux Robin H. Gurwitch Sandro Galea Betty Pfefferbaum 《Psychology in the schools》2010,47(6):592-605
Following terrorist events, teachers and nonteaching school personnel are important in helping children recover, yet little is known about their willingness to assist with this. We surveyed 399 employees from a Washington, D.C.‐area school district following terror attacks (September 11, 2001, attacks; sniper shootings) about their exposure, adjustment, interest, and involvement in psychosocial interventions. Between 10% and 27% experienced one or more symptoms of posttraumatic stress (depending on category of symptom) in the month prior to the survey. Regression analyses revealed that peritraumatic distress, behavior change, and posttraumatic growth predicted interest in information on psychosocial interventions. Feeling prepared, adaptively managing work responsibilities, and perceiving an increase in student problems were related to intervening with students. Implications for school preparedness are discussed. © 2010 Wiley Periodicals, Inc. 相似文献
4.
Lori Wong Vincent Beltran Chen Yang Shin Maekawa Sara Lardinois Hany Hussein 《文物保护研究》2018,63(5):307-315
ABSTRACTThe tomb of Tutankhamen in the Valley of the Kings, Egypt, one of the major attractions of the World Heritage Site of Ancient Thebes and its Necropolis on the West Bank of modern day Luxor, is today a destination for mass tourism. Visitors to the tomb increase relative humidity, elevate carbon dioxide levels, and encourage natural ventilation which facilitates entry of dust into the tomb. These conditions negatively impact the wall paintings and remaining artifacts in the tomb and create an uncomfortable environment for visitors. The deposition of dust inside the tomb collects on uneven wall painting surfaces, obscures their legibility and necessitates cycles of cleaning, which in turn leads to further damage. Developing environmental management strategies in the tomb to counter the effects of visitors and mitigate dust entry is an important component of the collaborative project between the Getty Conservation Institute (GCI) and Egypt’s Ministry of Antiquities (MoA) to conserve the tomb. These included implementation of a filtered-air supply and exhaust ventilation system to stabilize the interior microclimate and reduce dust in order to improve visitor comfort and contribute to the long-term preservation of the tomb. 相似文献
5.
William A. Firestone Roberta Y. Schorr 《Assessment in Education: Principles, Policy & Practice》2004,11(1):67-88
As testing becomes more prevalent as a policy tool in the Anglo‐Saxon world, debates continue as to whether it supports central reforms of instruction or leads to a kind of ‘teaching to the test’ that invalidates results and undermines more challenging instruction. This paper reports on a three‐year study of mathematics testing of nine‐year‐olds in New Jersey. Using a mix of surveys and direct observations with interviews, we conclude that New Jersey's testing policies contributed to both results. Where teachers feel more pressure, they respond with short‐term test preparation and focus on more didactic instructional strategies. When they know more about state and national standards and have the opportunity to learn more, they are inclined to use more inquiry‐oriented approaches and integrate test preparation with regular instruction. 相似文献
6.
吴雪松 《职教通讯(江苏技术师范学院学报)》2006,12(3)
非英语专业学生口语能力有待提高.如何提高学生的口语水平始终是英语教学中的难点和重点.传统教学模式下的大学英语教学束缚了学生学习潜能的发挥.大学英语教学模式的改革可以考虑采用"任务型教学法".任务型教学模式是20年来交际教学思想的一种发展形态,它把语言运用的基本理念转化为具有实践意义的课堂教学模式.本研究将任务型教学理念应用于非英语专业英语口语教学之中,通过对任务型教学理论的定义、特征和理论基础等方面的阐析,提出任务型口语教学的总体设计思路和具体教学改革措施. 相似文献
7.
Dynamic adaptation of multimedia content is seen as an important feature of next generation networks and pervasive systems enabling terminals and applications to adapt to changes in e.g. context, access network, and available Quality-of-Service (QoS) due to mobility of users, devices or sessions. We present the architecture of a multimedia stream adaptation service which enables communication between terminals having heterogeneous hardware and software capabilities and served by heterogeneous networks. The service runs on special content adaptation nodes which can be placed at any location within the network. The flexible structure of our architecture allows using a variety of different adaptation engines. A generic transcoding engine is used to change the codec of streams. An MPEG-21 Digital Item Adaptation (DIA) based transformation engine allows adjusting the data rate of scalable media streams. An intelligent decision-taking engine implements adaptive flow control which takes into account current network QoS parameters and congestion information. Measurements demonstrate the quality gains achieved through adaptive congestion control mechanisms under conditions typical for a heterogeneous network. 相似文献
8.
The present study aimed to comprehensively examine social cognition processes in children with and without learning disabilities (LD), focusing on social information processing (SIP) and complex emotional understanding capabilities such as understanding complex, mixed, and hidden emotions. Participants were 50 children with LD (age range 9.4-12.7; 35 boys, 15 girls) and 50 children without LD matched on grade, age, and gender. Children analyzed 4 social vignettes using Dodge's SIP model and completed 2 emotional recognition tasks (pictures and stories) and 4 emotional knowledge tasks, such as providing definitions and examples for 5 emotions (e.g., loneliness, pride, embarrassment). Study results demonstrated that children with LD had major difficulties in SIP processes and consistent difficulties with the different tasks in the understanding of complex emotions and in higher emotional understanding capabilities, such as understanding that 2 conflicting emotions (love and hate) can be simultaneously experienced. We discuss the implications of such difficulties for the understanding of social competence in children with LD as well as their implications for social skills intervention. 相似文献
9.
Khalafalla MM Daffalla HM Abdellatef E Agabna E El-Shemy HA 《Journal of Zhejiang University. Science. B》2011,12(4):303-312
This report describes in vitro micropropagation of Boscia senegalensis, so-called famine foods, that helped the people in Darfur and Kordofan, Sudan survive during the 1984–1985 famine. Four types
of explants prepared from green mature zygotic embryos were cultured on Murashige and Skoog (MS) medium augmented with 1–5
mg/L 6-benzyladenine (BA). The highest number of shoots per explant (14.3±0.9) was achieved on MS medium supplemented with
3 mg/L BA, while the highest shoot length [(3.5±0.4) cm] was obtained with 1 mg/L BA. The shoot cluster, when subcultured
to its same medium, significantly increased the rate of shoot multiplication by the end of the third subculture. The maximum
mean number of shoots per explant (86.5±3.6) was produced after three multiplication cycles on 3 mg/L BA-supplemented medium.
In vitro induced shoots were excised and rooted on half strength MS medium fortified with 0.25 mg/L indole-3-butyric acid
(IBA) to obtain complete plantlets. B. senegalensis-regenerated plantlets obtained in vitro for the first time, were hardened and 95% survived under greenhouse conditions. 相似文献
10.
Dennis Bachmann Katarina Grolinger Hany ElYamany Wilson Higashino Miriam Capretz Majid Fekri Bala Gopalakrishnan 《Information Retrieval》2018,21(6):541-564
Recommender systems have dramatically changed the way we consume content. Internet applications rely on these systems to help users navigate among the ever-increasing number of choices available. However, most current systems ignore the fact that user preferences can change according to context, resulting in recommendations that do not fit user interests. This research addresses these issues by proposing the \(({ CF})^2\) architecture, which uses local learning techniques to embed contextual awareness into collaborative filtering models. The proposed architecture is demonstrated on two large-scale case studies involving over 130 million and over 7 million unique samples, respectively. Results show that contextual models trained with a small fraction of the data provided similar accuracy to collaborative filtering models trained with the complete dataset. Moreover, the impact of taking into account context in real-world datasets has been demonstrated by higher accuracy of context-based models in comparison to random selection models. 相似文献