基于模态振型和L1正则化的结构损伤识别

考虑到基于2范数的正则化算法存在对结构识别结果过度光滑的效果,提出了基于模态振与L1正则化的损伤识别方法。以—2D简支梁有限元模型为数值算例,比较了使用不同振型数不同损伤程度对损伤识别效果的影响。数值模拟结果表明,对于多损伤工况,当损伤结构的振型数和无损结构的振型数乘积数大于6时,能较好地进行损伤定位,并能对损伤程度给出定性的描述。     

Cloning and characterization of a glucose 6-phosphate/phosphate translocator from Oryza sativa

INTRODUCTIONNongreenplastidsofheterotrophictissuesarecarbohydrate importingorganellesand ,inthecaseofamyloplastsofstoragetissues,thesiteofstarchsynthesis.Investigationofwholetissuesfromavarietyofstarchsynthesizingcropplantsindicatedthathexoseunitswereimpo…     

The Indian Association for the Cultivation of Science: A Tortuous Tryst with Modern Science

The Indian Association for the Cultivation of Science (IACS) founded by Mahendra Lal Sircar in Calcutta in 1876 was the first large-scale indigenous enterprise in colonial India for the propagation of modern science. The efforts towards the formation of the IACS were marked by a range of ideas and positions which reflected mainstream elite Indian attitudes to western science as also the many paradoxes that the colonial situation imposed on the whole enterprise. The first exposures of the Indian elite to western education had evoked an admiration for modern science, its values, and its infinite possibilities. But the admiration so generated could not run on a momentum of its own because of the limitations of the colonial education system itself. The appreciation of modern science also brought about a soul-searching as to why a civilization with a hoary tradition of science had stagnated. This, in turn, led to vigorous socio-cultural self-criticism aimed at ending what was perceived to be long slumber and degeneration. Science itself was seen as a force for such liberation and the alien colonial government as its chief facilitator. The latter was not too eager to promote science at large. Hence the need for an indigenous initiative. However, the plain existential realities of colonialism dictated that little could be achieved without the support of the government. With all its paradoxes and ironies, the IACS project was yet a grand endeavour, forming a lasting part of the Indian scientific landscape. In fact, given its peculiar circumstances, it would have been very unreal without its paradoxes.     

相依数据密度估计的距离

基于X_1…X_n作未知密度f(x)的核估计f_n(x),文章在{x_n}_1~∞为平稳、(?)—混合过程且核函数不连续的情况下,得到了f_n(x)的一致强相合性和L_1—模相合性．     

Academic Publishing in English: Exploring Linguistic Privilege and Scholars’ Trajectories

ABSTRACT

This paper explores the trajectories of six young academics (early-stage researchers) currently active in the context of Swedish academia in two different fields: English Linguistics and Political Science. Through a series of narrative interviews, the analysis investigates the development of their scholarly work, the relationship with their texts, and the negotiation of their position as contributors to their academic field. The paper discusses issues of language attitudinal and ideological nature, emphasising the need to focus on writers, rather than texts. The discussion revolves around the role of access to scholarly networks and to quality publication outlets as some of the key factors in shaping their development as young scholars and enabling opportunities to publish in highly-ranked journals. The goal of the article is to contextualise and problematize the notion of “privilege” that is customarily attributed to L1 English-speaking scholars, and to provide a more nuanced understanding of how young academics tackle the publishing enterprise.     

黄山野菊花中总黄酮含量的测定

采用分光光度法,以芦丁为标准品,对产于皖南黄山山脉的黄山野菊花中总黄酮含量进行了测定。黄山野菊花中总黄酮含量以芦丁计为6．29%,平均加样回收率为101．8%,RSD为0．28%。方法简便、快速、重现性好,可作为检测黄山野菊花中总黄酮含量的一种方法。     

"反思实践"思想及其在教师教育中的争议--来自舍恩、舒尔曼和范斯特马切尔的争论

本文在陈述舍恩的以"反思实践"为根基的教师教育思想的基础上,展示了西方教师教育领域围绕这一概念所展开的争议,指出这种争论有利于深化教师教育的学理探讨,有助于教师教育实践的健康发展.     

水杨酸对NaCl胁迫下水稻(Oryza Saliva L.)幼苗生理活性的影响

用0．2％水杨酸处理1．2％NaCl胁迫下水稻种子，测定其以下几个生理指标，种子的发芽率，发芽势和幼苗中的酯酶，过氧化氢酶以及抗坏血酸的含量，实验结果显示：外源性水杨酸能够相对提高NaCl胁迫下水稻种子萌发后幼苗的过氧化物酶活性和抗坏血酸的含量，同时也能提高水稻种子的发芽率，发芽势，但对酯酶活性影响不大，研究表明水杨酸能提高水稻种子萌发后幼苗的抗盐性，并使水稻种子出苗整齐，一致。     

Genetic linkage map ofBrassica campestris L. using AFLP and RAPD markers

A genetic linkage map comprised of 131 loci was constructed with an F₂ population derived from an inter-subspecific cross betweenBrassica campestris L. ssp.chinensis cv. ‘aijiaohuang’ and ssp.rapifera cv. ‘qisihai’. The genetic map included 93 RAPD loci, 36 AFLP loci and 2 morphological loci organized into 10 main linkage groups (LGs) and 2 small groups, covering 1810.9cM with average distance between adjacent markers being approximately 13.8cM. The map is suitable for identification of molecular markers linked to important agronomic traits, QTL analysis, and even for marker-assisted selection in breeding programs of Chinese cabbage and turnip. Project (No. 39870509) supported by the National Natural Science Foundation of China     

Optimization of conditions for supercritical fluid extraction of flavonoids from hops (Humulus lupulus L.)

Waste hops are good sources of flavonoids. Extraction of flavonoids from waste hops (SC-CO₂ extracted hops) using supercritical fluids technology was investigated. Various temperatures, pressures and concentrations of ethanol (modifier) and the ratio (w/w) of solvent to material were tested in this study. The results of single factor and orthogonal experiments showed that at 50°C, 25 MPa, the ratio of solvent to material (50%), ethanol concentration (80%) resulted in maximum extraction yield flavonoids (7.8 mg/g). HPLC-MS analysis of the extracts indicated that flavonoids obtained were xanthohumol, the principal prenylflavonoid in hops. Project (No. Y304203) supported by the Natural Science Foundation of Zhejiang Province, China