密度对车前草生长的影响

以车前草为实验材料,研究不同密度(5棵/盆、8棵/盆、10棵/盆)对车前草生长状况的影响。实验表明,随着车前草密度的增大,其植株高度,叶柄高度,叶片高度也随之增加;根长,根重,叶重随着密度的增大而减小,而叶宽没有明显的变化。     

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.     

教师在\"3L\"教学模式中的角色定位

上海电视大学在现代远程开放教育的实践中,不断总结经验,逐步形成了\"运用现代信息技术,以学习者自主学习为中心、教育者引导学习为前提、多种媒体教学资源和手段支助学习为基础的‘导学-自学-助学'三维互动教学模式\",简称为\"3L\"教学模式.本文在\"3L\"教学模式的实践中,提出教师在远程教学中应遵循一定的原则发挥导学作用,结合现代远程教育的特点,联系教学方法,精心设计教学内容,提高自己的综合素质,对自己的角色及职能作出相应的调整.     

Communication channels within ethnic groups

Major channels of communication are examined for two major functions: providing news of the ethnic community, and linking ethnics to the “mother country.” The four major channels are: interpersonal channels (friends and neighbors), radio, local metropolitan daily newspapers, and ethnic-language newspapers. Size of ethnic group is linked to channel preference, and greater ethnicity is related to a preference for ethnic media for both functions. Lower SES ethnics lend to rely more on interpersonal communication and ethnic media, while higher SES ethnics turn more to metro media and magazines. Channel preference as indicated by respondents is also linked to actual usage patterns.     

桑叶提取物对DPPH自由基的清除能力研究

以超声波法对桑叶有效成分进行提取,得到Ⅰ、Ⅱ、Ⅲ共3个提取物,然后采用二苯代苦味酰肼自由基（DPPH·）法对提取物进行了自由基清除试验。结果表明：3个桑叶提取物对DPPH自由基均具有较好的自由基清除能力,这说明了桑叶可作为自由基清除物质资源开发利用。     

二语习得关键期假说探讨

本文首先介绍了二语习得关键期假说及其理论背景,之后通过前人的各项研究探讨关键期假说是否具有合理性,希望对教学有启示作用。     

构式“VP＋在＋L”与动词的语义整合

从历时角度探讨\"VP+在+L\"构式的承继理据性,可以确定构式的基本事件类型为\"存在事件\",基本义为\"存在主体以某种方式存在于某地\"。动词事件与构式事件可以以子类、前提、方式和结果等关系进行互相作用,从而整合出具体的句式义。动词事件与构式事件在保证共享一个以上参与者的前提下,通过各种关系相互整合,这正是动词与构式的互动体现,也是\"VP+在+L\"产生多义性的根本原因。     

景天三七中总黄酮提取条件和含量分析

目的：研究不同提取溶剂对景天三七中总黄酮的含量影响及最佳提取条件下总黄酮的含量。方法：采用盐酸一镁粉法和醋酸铅法对景天三七中总黄酮进行检识,并用不同溶剂对景天三七中总黄酮进行了提取,以分光光度法测定总黄酮含量,以芦丁为标准品,以10％AI（NO2）3-5％NaNO2为显色剂,在508nm波长处进行测定。结果：检识试验证明景天三七中含有黄酮类物质,且最佳提取溶剂为80％乙醇（P〈0．05）。在此提取条件下,测得景天三七中总黄酮的含量为18．39mg·g～,RSD为2．2％（n=5）。总黄酮测定线性范围为15．20-45．60beg·mL^-1。（r=0．9997）,平均回收率为95．74％,RSD为0．98％（n=6）。结论：景天三七中黄酮类物质的最佳提取溶剂为80％乙醇。本法准确可靠,重现性好,结果稳定,适合于景天三七中总黄酮含量分析。