定数截尾下几类可靠性分布的未知参数的E B估计

在定数截尾试验下,本文利用指数分布次序统计量的性质,对几类分布常见的可靠性分布密度函数的未知参数进行了Bayes分析,得出了相应的Bayes估计,并给出了数值例子说明此方法较好.     

Northrop Frye in the Elementary Classroom

Northrop Frye (1912–1991) was one of the leading literary theorists of his day, and this article shows the ways in which his theories continue to be relevant for both the field of literary criticism and elementary classroom education today. The author, an eminent scholar in the field of children’s literature in her own right and a student of Northrop Frye, presents her interpretation of his major theories as they relate to reading and writing pedagogy in the elementary school classroom. This article articulates some of the key issues developed in the author's book, The Child As Critic, which has undergone a number of printings and editions, and which may well be as close as we get to a handbook for teaching the art of literature, as Northrop Frye might have written it.     

现代中药制剂的进展

本文从中药剂型与制剂的研究进展、新技术新工艺新辅料的研究进展、中药制剂质量控制研究进展三个方面回顾了我国近几十年来中药制剂的发展历程，对文献追踪、整理分类、分析归纳，丰富了中药药剂学理论，中药制剂前处理技术及剂型的改进与创造，优化了中药制剂的质量，扩大了中药剂型的品种和应用范围，从整体上提高了中药制剂的技术水平。     

Adaptive progressive download based on the MPEG-4 file format

In this paper we describe how progressive download and adaptive streaming can be combined into a simple and efficient streaming framework. Based on the MPEG-4 file format (MP4) we use HTTP for transport and argue that these two components are sufficient for specifying an open streaming architecture. The client selects appropriate chunks from the MP4 file to be transferred based on (1) the header information (i.e. the “moov” box) in the first part of the file and (2) his observation of network throughput. The framework is completely client driven which allows for better server scalability and reduces signalling overhead. We discuss architecture and implementation issues such as complexity, interoperability and scalability and compare to 3GPP PSS Rel-6 adaptive streaming when appropriate. Measurements from a simple MP4/HTTP streaming client are presented showing that appropriate chunks are selected such that increased reliability is achieved.     

‘We Have to Go Where the Money Is’—Dilemmas in the Role of Nutrition Scientists: An Interview Study

In Western societies scientists are increasingly expected to seek media exposure and cooperate with industry. Little attention has been given to the way such expectations affect the role of scientific experts in society. To investigate scientists’ own perspectives on these issues eight exploratory, in-depth interviews were conducted in Denmark with reputable nutrition scientists. Additionally, eight interviews were held with ‘key informants’ from the field of nutrition policy. It was found that nutrition scientists experience two dilemmas: first, between their aspiration to make a collective impact on public health and the powerful incentives of each to appear frequently in the media with new messages; second, between their need to cooperate with the food industry for financial reasons and their fear that this may compromise their independence and scientific integrity. It is argued that the dilemmas identified in this study should be dealt with openly by the relevant groups of scientists.     

商贸英语网络教学平台教学优势探讨

网络的广泛应用,对传统的商贸英语教学模式提出挑战的同时也赋予了变革的平台。立足于交流和实务的商贸英语教学必将通过新的媒体介质才能发挥它的效用。本文探讨商贸英语平台在商贸英语教学中的优势,以期为商贸英语教学改革做出一点贡献。     

Antimelanogenic effects of <Emphasis Type="Italic">Inula britannica</Emphasis> flower petal extract fermented by <Emphasis Type="Italic">Lactobacillus plantarum</Emphasis> KCCM 11613P

The inhibitory effects of Lactobacillus plantarum-fermented and non-fermented Inula britannica extracts on the tyrosinase activity were comparatively investigated to examine whether and how they improve the whitening activity, and the contents of total flavonoids and polyphenolics as bioactive compounds were determined. The skin whitening activity using in vitro or ex vivo tyrosinase and L-3,4-dihydroxyphenylalanine (L-DOPA) staining was examined. The total flavonoid content (TFC) was increased by 13.4% after 72 h-fermentation. The viabilities of the B16F10 cells treated with the fermented and non-fermented control extracts were 100.26% and 92.15% at 500 μg/ml, respectively. In addition, the inhibition of tyrosinase activity was increased by the fermented samples from 29.33% to 41.74% following fermentation for up to 72 h. The tyrosinase activity of the untreated control group was increased to 145.69% in B16F10 cells. The results showed that I. britannica fermented by L. plantarum dose-dependently inhibited tyrosinase activity, which was stimulated by α-melanocyte stimulating hormone. These results suggest that lactic fermented I. britannica extracts can be used as effective skin-whitening materials.     

黑土土壤水分光谱响应特征与模型

为揭示土壤水分对土壤反射率的影响机理,并为其他土壤参数遥感监测提供理论支持,以吉林省德惠市黑土野外、室内高光谱反射率为研究对象,运用光谱分析方法与统计分析方法,分析土壤水分光谱特征,建立土壤水分光谱模型,得出以下结论：土壤光谱反射率在400-2500 nm范围内主要有5个吸收谷,随着含水量的增加,土壤光谱吸收谷的面积增大;而秸秆光谱反射率在土壤前2个吸收谷附近没有明显的吸收特征;未翻耕土壤由于秸秆残茬的影响,第二吸收谷左右两部分面积比例增大,这一特征可用于判别土壤是否翻种;土壤表层0-5cm含水量与反射光谱数据的相关性强于5-10cm;土壤含水量与土壤光谱反射率之间是指数或线性关系;土壤含水量高光谱模型稳定性较好、精度较高,可以用于土壤含水量的速测。     

简易的流体压强实验

1吹纸实验取一张白纸,将其压在书中,如图1所示,向纸面上吹气,纸将向吹气一面飘起来;取两张白纸,它们间隔一定的距离,如图2所示,向两张纸面中间吹气,两纸面立刻相互靠拢。