Secret keys from quantum correlations     

N. Lütkenhaus 《Informatik - Forschung und Entwicklung》2006,54(1):29-37

Quantum mechanics allows to create information-theoretical secure key based only on observed data. We review the current status of the resulting field quantum key distribution.  相似文献   

'I never thought they would enjoy the fun of science just like ordinary children do'– Exploring science experiences with early years teacher training students and children with severe and profound learning difficulties     

Alison Bishop  & Phyllis Jones 《British Journal of Special Education》2003,30(1):34-43

Alison Bishop and Phyllis Jones both work in the School of Education at Northumbria University where they teach on undergraduate and postgraduate programmes. Phyllis Jones specialises in disability issues and Alison Bishop focuses on early years education. For the project described in this paper, they combined their areas of expertise, devising a small–scale research project to explore the experiences of a group of early years science specialist student teachers as they took part in workshops with a group of early years children with severe and profound learning difficulties. The research explores the changing attitudes and perceptions of the students with regard to the learning and teaching of science with young children. It becomes clear that there is a realization for many students that science can make a significant contribution to the education of children with severe and profound learning difficulties in the early years. The authors also discuss the need for training to equip the students to meet the challenges and rewards of working with children with severe and profound learning difficulties in their future teaching careers.  相似文献   

Connecting with connexions: the role of the personal adviser with young people with special educational and support needs     

Bob Grove  Alison Giraud–Saunders 《Support for Learning》2003,18(1):12-17

The Connexions service has particular responsibility for coordinating transition planning for students with learning difficulties. In this study Bob Grove and Alison Giraud–Saunders report on the development of the personal adviser (PA) role in two special schools and an FE college as part of the Lewisham Connexions pilot. This article is based on the evaluation report of the Connecting with Connexions project, which is available in full from the authors.  相似文献   

设计复现轨迹机构的新办法     

吕慧瑛 《苏州市职业大学学报》2001,12(3):62-65

一、前言 目前大多数用优化方法设计一个复现轨迹的机构,主要是考虑运动性能,通过运动分析,建立起关于指定点与给定点的位置误差的目标函数,而本文试图通过力分析,设计一个四杆机构,使指定点能复现预期轨迹,从而把运动学问题与动力学问题结合起来,为同时满足运动性能和动力性能,设计出更为合理的机构提供了一种可行的方法。  相似文献   

我国体育界诚信缺失的成因分析及其对策研究   总被引：2，自引：0，他引：2  

吕志刚  柏建清  赵元吉 《西安体育学院学报》2006,23(3):31-33,39

在我国体育运行机制向市场化转轨的进程中,体育界出现了较为严重的诚信缺失现象,这势必会对我国体育事业的可持续发展产生负面影响。根据我国经济文化背景、转轨过程中的体育管理机制以及体育界的激励机制,探讨了我国体育界诚信缺失的成因,在此基础上,提出了有针对性的治理措施。  相似文献   

A static method for obtaining a calibration factor for SRM bicycle power cranks   总被引：1，自引：0，他引：1  

Andrea L. Wooles  Anthony J. Robinson  Peter S. Keen 《Sports Engineering》2005,8(3):137-144

Many scientists and coaches are interested in mechanical power produced during cycling, and use Schoberer Rad Me\technik (SRM) bicycle power cranks to obtain this data. However, it has been expensive and difficult to calibrate SRM cranks, causing much of the collected data to be unreliable. We present a static method, derived from first principles, for obtaining a calibration factor for SRM cranks. A known mass and lever arm (chainring of a known diameter) are used to apply a known torque load to the instrument in four positions, and the output frequencies are used to calculate the calibration factor in Hz/Nm. The reproducibility of this method is ±0.01 Hz/Nm, which is acceptable for the application of the instrument, which is measurement of mechanical power application by cyclists at the crank. The method is reliable, inexpensive, and easy to set up, and will allow higher confidence in data collected using SRM power cranks. We recommend calibration of the power meter once every six months because of the measured drift of the calibration factor over time.  相似文献   

继续教育之反思   总被引：1，自引：0，他引：1  

吕为民 《新乡教育学院学报》2005,18(2):65-66

文章根据教学实际,就继续教育课程在内容选定、组织安排方面进行了探讨,并就教学中可能出现的问题提出了可行的对策。  相似文献   

Statement of Editorial Policy     

Willis F. Overton  & Danielle L. Horvath 《Monographs of the Society for Research in Child Development》2000,65(2):107-108

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Practical Applications of Student Response Analysis     

Deborah M. Switzer  Michael L. Connell 《Educational Measurement》1990,9(2):15-17

What standard reports are included in TAP and SPP? What information is provided in item analysis output? How may teachers use the information in their instruction?  相似文献   

Psychometric reevaluation of the scientific attitude inventory‐revised (SAI‐II)     

Michael J. Lichtenstein  Steven V. Owen  Cheryl L. Blalock  Yan Liu  Kacy A. Ramirez  Linda A. Pruski  Carolyn E. Marshall  Mary Anne Toepperwein 《科学教学研究杂志》2008,45(5):600-616

The central purposes of this study were to review the development and evolution of the Scientific Attitude Inventory (SAI) and then reevaluate the psychometric properties of the revised form of the SAI, the Scientific Attitude Inventory II (SAI‐II). The SAI‐II was administered to a convenience sample of 543 middle and high school students from five teachers in four schools in four school districts in San Antonio, Texas, at the beginning of the 2004–2005 school year. Confirmatory factor analysis on the full data set failed to support the existence of a 12‐factor structure (as proposed by the scale developers) or a one‐factor structure. The data were then randomly divided into exploratory [exploratory factor analysis (EFA)] validation and confirmatory [confirmatory factor analysis (CFA)] cross‐validation sets. Exploratory and confirmatory models yielded a three‐factor solution that did not fit the data well [χ² (321) = 646, p < .001; RMSEA = .061 (.90 CI = .054–.068); and CFI = .81]. The three factors were labeled “Science is About Understanding and Explaining” (13 items), “Science is Rigid” (6 items), and “I Want to Be a Scientist” (8 items). The α‐coefficients for these three factors ranged from 0.59 to 0.85. Whether these identified subscales are valid will require independent investigation. In this sample, and consistent with prior publications, the SAI‐II in its current form did not have satisfactory psychometric properties and cannot be recommended for further use. © 2008 Wiley Periodicals, Inc. J Res Sci Teach 45: 600–616, 2008  相似文献