A study of the quality,the design and the economy of concrete     

Inge Lyse 《Journal of The Franklin Institute》1936

The outstanding results brought out by this investigation were:

1.

1. The Strength and practically all other desirable qualities of concrete except volume changes, increase uniformly with the increase in cement concentration in the amount of water in the concrete at the time of hardening.  相似文献   

Value added based on educational positions in Dutch secondary education          下载免费PDF全文

Anneke C. Timmermans  Roel J. Bosker  Inge F. de Wolf  Simone Doolaard  Margaretha P. C. van der Werf 《British Educational Research Journal》2014,40(6):1057-1082

Estimating added value as an indicator of school effectiveness in the context of educational accountability often occurs using test or examination scores of students. This study investigates the possibilities for using scores of educational positions as an alternative indicator. A number of advantages of a value added indicator based on educational positions of students can be formulated, such as: (a) the societal significance of educational position as output measure; (b) the fact that a single indicator can be estimated for an entire school in a differentiated educational system, where not all schools provide education in all tracks; and (c) the expectation that value added based on educational positions leads to other incentives for schools than value added based on test scores. Empirical analysis of Dutch cohort data (VOCL'99) for secondary education showed considerable differences in effectiveness between schools in the positions of students. Furthermore, differential school effects were found for both socio‐economic status and prior achievement. The phenomena of differential school effects for socio‐economic status and prior achievement are linked to differences between schools in the kind of tracks in which the schools provide schooling.  相似文献   

RTP-based broadcast streaming of high definition H.264/AVC video: an error robustness evaluation     

HILLESTAD Odd Inge  JETLUND Ola  PERKIS Andrew 《浙江大学学报(A卷英文版)》2006,7(Z1)

In this work, we present an evaluation of the performance and error robustness of RTP-based broadcast streaming of high-quality high-definition (HD) H.264/AVC video. Using a fully controlled IP test bed (Hillestad et al., 2005), we broadcast high-definition video over RTP/UDP, and use an IP network emulator to introduce a varying amount of randomly distributed packet loss. A high-performance network interface monitoring card is used to capture the video packets into a trace file. Purpose-built software parses the trace file, analyzes the RTP stream and assembles the correctly received NAL units into an H.264/AVC Annex B byte stream file, which is subsequently decoded by JVT JM 10.1 reference software. The proposed measurement setup is a novel, practical and intuitive approach to perform error resilience testing of real-world H.264/AVC broadcast applications. Through a series of experiments, we evaluate some of the error resilience features of the H.264/AVC standard, and see how they perform at packet loss rates from 0.01 % to 5%. The results confirmed that an appropriate slice partitioning scheme is essential to have a graceful degradation in received quality in the case of packet loss. While flexible macroblock ordering reduces the compression efficiency about 1 dB for our test material, reconstructed video quality is improved for loss rates above 0.25%.  相似文献   

Head start for the handicapped: Congressional mandate audit.     

G L Ensher  B Blatt  J F Winschel 《Exceptional children》1977,43(4):202-210

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Sexual violence and youth in South Africa: the need for community-based prevention interventions     

Petersen I  Bhana A  McKay M 《Child abuse & neglect》2005,29(11):1233-1248

OBJECTIVES: South Africa is reported to have one of the highest rates of sexual violence in the world, with adolescent girls between the ages of 12-17 being particularly at risk. Given that adolescence is considered a critical developmental period for establishing normative sexual behavior, this study explored multiple levels of risk influences that render adolescent girls vulnerable to becoming victims of sexual violence and adolescent boys vulnerable to becoming perpetrators of such abuse in one South African community. METHOD: A case study approach using qualitative rapid focused ethnographic methods was used. This involved 10 focus group interviews and 10 individual interviews with a volunteer convenience sample of adolescent boys and girls between the ages of 14 and 16 years. RESULTS: Inductive thematic analysis revealed that there were indeed multiple levels of risk influences for adolescent girls and boys becoming either victims or perpetrators of sexual violence. Using the Theory of Triadic Influence as a framework, influences at the distal socio-cultural/environmental level included traditional notions of masculinity and normalization of inter-personal violence as well as poverty and the commodification of sex leading to rape supportive attitudes. Influences at the proximal situation context/social normative level included high-risk social norms as well as a weak adult and community protective shield. Finally, influences at the intra-personal level included low self-esteem and self-efficacy as well as inter-personal affective anger. CONCLUSION: Given the multiple levels of risk influences that need to be addressed to protect youth from becoming either perpetrators or victims of sexual violence in the South African context, prevention programs should necessarily be comprehensive, developmentally timed, and community-based.  相似文献   

Uncovering Students’ Environmental Identity: An Exploration of Activities in an Environmental Science Course     

Erica Blatt 《The Journal of environmental education》2013,44(3):194-216

This study at a public high school in the Northeastern United States explores how students’ environmental identities are affected by various activities in an Environmental Science course. Data was collected as part of an ethnographic study involving an Environmental Science teacher and her tenth–twelfth grade students. The results focus on interviews with 10 students and the teacher, conducted at three points during the semester-long course. The findings illuminate ways in which students’ identities (environmental and consumer-materialist) are affirmed or disconfirmed during classroom activities, the importance of establishing personal connections with environmental issues, and challenges related to the teaching of controversial environmental issues.  相似文献   

Chameleon effects in homework research: The homework–achievement association depends on the measures used and the level of analysis chosen     

Ulrich Trautwein  Inge Schnyder  Alois Niggli  Marko Neumann  Oliver Lüdtke 《Contemporary educational psychology》2009

Using a data set specifically tailored to homework research, with a sample of 1275 students from 70 classes in Switzerland, the association between homework and achievement in French as a second language was tested at three levels (class level, between-student level, and within-student level). The strength and direction of the homework–achievement association depended on the homework indicator chosen and differed to some degree across analytical levels. At the class level, achievement was higher in classes set frequent homework assignments and in classes where students reported low overall levels of negative emotions when doing homework. At the between-student level, high individual homework effort and low levels of negative homework emotions predicted favorable developments in French achievement, whereas high homework time predicted lower achievement. At the intraindividual level, high homework effort, high homework time, and low levels of negative homework emotions were statistically significantly associated with positive student evaluations of the learning gains from the specific assignment.  相似文献   

Changes in Stress Perception and Coping During Adolescence: The Role of Situational and Personal Factors     

Inge Seiffge-Krenke  Kaisa Aunola  and Jari-Erik Nurmi 《Child development》2009,80(1):259-279

The present study investigated the interplay between developmental changes in stress and coping during early and late adolescence. Using a longitudinal design, stress perception and coping styles of 200 adolescents in 7 different stressful situations were investigated. Multilevel piecewise latent growth curve models showed that stress perception decreased during late adolescence, whereas active and internal coping increased continuously from ages 12 to 19. Adolescents' high levels of perceived stress in a particular situation were associated with a high level of active coping but a low level of internal coping in that same situation. Withdrawal was associated with high levels of perceived stress, independent of situation. Developmental changes in individual adolescents' stress perception and coping were in most cases situation specific.  相似文献   

大学生应对气候变化的伦理取向探讨   总被引：6，自引：0，他引：6  

罗静  潘家华  李恩平 《科学对社会的影响》2009,(3):5-9

近年来,气候变化作为热点议题不断升温。大量的文献对气候变化形成的原因、气候变化所可能带来的危害作出了多方面的分析（如OECD 1996,编委会2007,Stern 2007．UNDP2007）,也出现了大量针对适应气候变化所产生成本和效益的有价值研究（如潘家华等2007,stern 2007）。然而,应对气候变化不仅是一个环境问题和经济问题,  相似文献   

Rethinking agency as an assemblage from change management to collaborative work     

Inge Van de Putte  Elisabeth De Schauwer  Geert Van Hove  Bronwyn Davies 《International Journal of Inclusive Education》2018,22(8):885-901

The movement towards inclusion comes together with a neoliberal audit mentality whereby individuals are held responsible for the transformations. The Special Educational Needs Coordinators (SENCOs) are seen as ‘change agents’ whose task it is, to support teachers in adapting their approach to optimise the chances for children with special needs in regular schools. In this paper, we want to problematise the ‘responsibility-blame discourse’ and look differently at agency. By using a diffractive methodology based on collaborative work, in which we have used material images of the workplace of the SENCO, and read-the-data-while-thinking-with-theory, we deconstruct the individualisation of agency. The SENCOs are no longer seen as separate individual humanist subjects where agency is solely lodged in the body of an individual agent [Barad, K. 2007. Meeting the Universe Halfway: Quantum Physics and the Entanglement of Matter and Meaning. Durham: Duke University Press] but the SENCOs are part of the intra-active entanglement of multiple agencies, of an assemblage. This re-conceptualisation of agency leads to a different approach to inclusion, in which the participants in any encounter can work as part of the assemblage to develop communities capable of re-thinking practice and transforming it into a place where children with special needs become legitimate members of the school.  相似文献