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71.
Becky Mann 《英语大王(小学)》2013,(5):4-7
妈妈生病了,爸爸出门给她买果汁。哥哥、妹妹和我会为妈妈做什么呢?It was Sunday morning. Mum was sick* in bed." Mum needs someorange juice," Dad said." I’ll go to the store and get some for her. Begood while I’m gone(不在)."*" Dad is gone," said my big brother." Now I’m the boss."" I want to文∕Becky Mann 相似文献
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Mann R. 《浙江大学学报(A卷英文版)》2005,6(12):1379-1385
Body-scanning exploiting 3-D imaging has revolutionised diagnostics and treatment in medicine. Process engineers would like
to be similarly able to image chemical process units in 3-D, but without the £multi-million price tag. UMIST and Leeds University
have together, through the Virtual Centre for Industrial Process Tomography (http://www.vcipt.org), pioneered several electrical
process tomography techniques and used them in a variety of applications. Illustrations are presented to show how electrical
resistance tomography (ERT) has been developed for typical stirred vessels widely encountered in batch process manufacturing.
The technique is potentially fast and inexpensive and capable of imaging both dynamic and pseudo-stationary processes. Examples
from UMIST's two-tonne vessel will be presented for miscible tracer mixing, as well as gas-liquid and solid-liquid mixing. 相似文献
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Time sampling: a methodological critique 总被引:5,自引:0,他引:5
Numerous developmental studies of social behavior employ an observational technique called time sampling. This technique is used to estimate the frequencies and proportions of time that actual behaviors occur and to measure group or individual differences. By contrasting time sampling to continuous sampling, we demonstrate that (a) time sampling is inaccurate for estimating actual durations or frequencies of behavior, and (b) resulting individual and/or group differences can change depending on whether time sampling or continuous sampling is used. Error rates are particularly high when the total bout lengths of the actual behaviors are short (as in mother-infant interactions) and/or when interval length is long. Because the majority of mother and infant behaviors are short in bout length (less than 60 sec), when percent error is the greatest, we suggest that alternative sampling methods that have proven validity be used in future studies (e.g., scan, point, or continuous sampling). 相似文献
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Work experience placements are mandatory in the UK for all young people aged 16–18 in education, and their employability effects and associated wage premia are well noted in the literature. Through Bourdieu’s lens, this article analyses and conceptualises a unique data set of reflective testimonies submitted in response to a YouGov survey of over one thousand young people. Different capitals are detected, their distributions are observed, and correlations with key variables such as social background and school type are reported. Emerging through young people’s perceptions of employer engagement is a complex web of human, social and cultural capital accumulation. Overlaps are frequent, with newly acquired forms of capital often activating others. We argue that because of the cyclical nature of employer engagement gains, benefits accumulate exponentially for some young people while leaving others increasingly detached from the capitals that are most important for labour market success. 相似文献