829 resultados para 1467


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Through an acclimation period of 10 days, compared to white light, the maximal net photosynthetic rates were significantly higher for gametophytes of Undaria pinnatifida cultivated under blue light (400-500 nm), and were lower under red light (600-700 nm). Chlorophyll c and the carotenoid content of gametophytes were similar under blue light and red light but were much lower under white light. The growth rate of female gametophytes under blue light was higher than that under other lights, and the growth rate of male gametophytes showed little variation with respect to blue and white light. Male and female gametophytes were mixed together to form sporophytes under white, blue and red light. After approximately 5 days, 50% gametophytes became fertile under blue and white light, but remained vegetative under red light after 10 days.

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报道了中国西部赖草属一新种——贫穗赖草。该种相似于若羌赖草和广叉赖草,但它不同于前者在于穗状花序的中部或下部具孪生小穗,外稃披针形、无毛,具1.0~1.5mm长的短尖头,内稃短于外稃1.0~1.5mm,沿上部脊疏生小刺,叶鞘无毛,具非膜质边缘;不同于后者在于秆较高,叶片内卷,穗状花序稀疏、狭窄,小穗较短,颖较长,外稃披针形、较长,具5条不明显的脉。

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本发明涉及麻花秦艽植物的引种栽培技术,该技术包括种子处理技术、人工育苗技术和引种栽培技术。本发明通过对麻花秦艽植物种子进行物理和化学方法处理,使植物种子萌发率达70%以上;通过人工育苗途径,可根据种苗数量和季节需要,有效地提供优质种苗;通过在海拔1500—4500米的人工育苗原产地移栽或种子直播途径,可快速恢复麻花秦艽的资源量,并有效地保证麻花秦艽植物的药材品质和药效成分。

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本文集中论迷油雾气喷射入高速运转的主轴轴承内,形成涡流最佳的方式及使用油雾混合空气系统和热变形,通过安装在机床主轴上的传感器等设备,反馈来进行误差补偿的新技术。

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水生生态系统的汞污染及其引发的甲基汞在生物体内聚集是全球重要的环境问题。汞污染的主要机理是大气汞的迁,研究冰川中总汞的质量浓度,能很好地揭示大气汞沉降的历史记录。对怀俄明州(Wyoming)弗里蒙特冰川上游the UpperFremont Glacier,UFG)冰芯的研究,显示了近270年自然源与人为源的大气汞释放。

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In this paper, we bound the generalization error of a class of Radial Basis Function networks, for certain well defined function learning tasks, in terms of the number of parameters and number of examples. We show that the total generalization error is partly due to the insufficient representational capacity of the network (because of its finite size) and partly due to insufficient information about the target function (because of finite number of samples). We make several observations about generalization error which are valid irrespective of the approximation scheme. Our result also sheds light on ways to choose an appropriate network architecture for a particular problem.

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This article contributes to the debate on what form of preparation and support can enhance the intercultural student experience during the Year Abroad. It presents a credit-bearing and multi-modal module at a UK university designed to both prepare students prior to departure through a series of workshops and activities on an e-portfolio and help them engage in meta-reflection on intercultural issues during their stay. The presentation of the curricular components of the course and instances extracted from student blogs are contextualised within theoretical considerations on intercultural education and a holistic approach to student development. The longitudinal evolution of the module is presented in the context of an iterative approach leading to a cycle of revisions and amendments. With its pragmatic stance this article aims to address one of the concerns recently expressed about intercultural education, namely that although intercultural theories are suitably incorporated in the latest thinking on communicative competence, there is a lack of evidence-based practice.

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I examine the positive and negative features of synthetic biology (‘SynBio’) from a utilitarian ethical perspective. The potential beneficial outcomes from SynBio in the context of medicine are substantial; however it is not presently possible to predict precise outcomes due to the nascent state of the field. Potential negative outcomes from SynBio also exist, including iatrogenesis and bioterrorism; however it is not yet possible to quantify these risks. I argue that the application of a ‘precautionary’ approach to SynBio is ethically fraught, as is the notion that SynBio-associated knowledge ought to be restricted. I conclude that utilitarians ought to support a broadly laissez-faire stance in respect of SynBio.

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Odello, Marco, 'Thirty Years After Helsinki: Proposals for OSCE's Reform', Journal of Conflict and Security Law, (2005) 10(3):435-449 RAE2008

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Abrahamsen, Rita, Williams, Paul, 'Ethics and Foreign Policy: The Antinomies of New Labour's 'Third Way' in Sub-Saharan Africa', Political Studies (2002) 49(2) pp.249-264 RAE2008

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Abrahamsen, Rita, 'The Power of Partnerships in Global Governance', Third World Quarterly (2004) 25(8) pp.1453-1467 RAE2008

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Alden, N. L. (2007). Introduction. Critical Quarterly, 49 (2), pp.34-38 RAE2008

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Editorial for Bioethics 2016. 30:(2)

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We describe a GB parser implemented along the lines of those written by Fong [4] and Dorr [2]. The phrase structure recovery component is an implementation of Tomita's generalized LR parsing algorithm (described in [10]), with recursive control flow (similar to Fong's implementation). The major principles implemented are government, binding, bounding, trace theory, case theory, θ-theory, and barriers. The particular version of GB theory we use is that described by Haegeman [5]. The parser is minimal in the sense that it implements the major principles needed in a GB parser, and has fairly good coverage of linguistically interesting portions of the English language.