Seeking Nettle Textiles – Utilizing a Combination of Microscopic Methods for Fibre Identification     

Jenni A. Suomela  Krista Vajanto  Riikka Räisänen 《文物保护研究》2018,63(7):412-422

Bast fibres have been commonly used as a textile material in Northern Europe since Neolithic times. However, the process of identifying the different species has been problematic, and many important questions related to their cultural history are still unanswered. For example, a modified Herzog test and the presence of calcium oxalate crystals have both been used in identification. In order to generate more reliable results, further research and advancement in multi-methodological methods is required. This paper introduces a combination of methods which can be used to identify and distinguish flax (Linum usitatissimum), hemp (Cannabis sativa), and stinging nettle (Urtica dioica). The research material consisted of reference fibres and 25 fibre samples obtained from 12 textiles assumed to be made of nettle. The textiles were from the Finno-Ugric and Historical Collections of The National Museum of Finland. The fibre samples were studied by observing the surface characteristics and cross sections with transmitted light microscopy, and by using a modified Herzog test with polarized light, in order to identify the distinguishable features in their morphological structures. The study showed that five out of 25 samples were cotton, 16 nettle, one flax, and one hemp. Findings from two samples were inconsistent. The results show that it is possible to distinguish common north European bast fibres from each other by using a combination of microscopic methods. Furthermore, by utilizing these combined methods, new and more reliable information could be obtained from historical ethnographic textiles, which creates new vistas for the interpretation of their cultural history.  相似文献   

教研室管理视域下的大学英语教师素养提升     

何晓斓  唐文杰 《湖南第一师范学报》2015,(2)

教研室工作的核心力量是教师。教师整体素养的提升，是教研室工作得以顺利展开的关键。在提升教师素养方面，大学英语教研室可以开展如下工作：引导探究大学英语教师素养的内涵；组织分析优秀教师个人素养提升的案例；保持团队的持续发展与影响。  相似文献   

输水渠道横断面设计水深测试及计算(综合性)实验     

陈祖森  马亮  李彦 《实验技术与管理》2007,24(2):152-153,156

输水渠道横断面设计水深测试及计算实验结合“灌溉排水工程学”及“水力学”等学科的知识,在实验过程中,通过对实验数据的测试、分析及计算和渠道模型实物的观摩,加深了对渠道设计原理的理解,与课堂上的理论教学起到了良好的互动作用。  相似文献   

普通高中基层弹性教研组织的建构   总被引：2，自引：0，他引：2  

李继良 《教育理论与实践》2003,(17)

普通高中基层教研组织是学校的基本单位,是教师成长、发展、互动的群体。尽管传统教研组织在“教师职业化”方面意义深远,但其在现实中过于彰显科层性管理功能:只涉及问题的解决,而不注重问题的发现和问题的界定;高扬的“工具理性”阻碍了“教师职能的专业化”的发展。面对走向“专业化的教师职业”问题,本研究认为:对教研组的研究和改型变得十分必要;构建一个弹性教研组织作为教师反思、批判和发展的平台已势在必行。  相似文献   

正确把握“三个关系“促进机关后勤服务的顺利转轨     

黄国保 《长江工程职业技术学院学报》2004,21(2):62-64

机关后勤服务业要努力塑造服务新形象,变被动服务为主动服务,坚定走产业化道路,这样才能保证可持续发展.  相似文献   

一维搜索的程序实现   总被引：2，自引：0，他引：2  

张莹 《沈阳教育学院学报》2002,4(4):104-106

对于不可微的一元目标函数，我们用一维搜索去解决。本文给出了一维搜索中的三个算法：二分法，三等分算法，黄金分割法各自的C语言源程序，从而可以求出目标函数比较精确的近似最优点。  相似文献   

From natural numbers to numbers and curves in nature —I     

A.?K.?MallikEmail author 《Resonance》2004,9(9):29-37

The interconnection between number theory, algebra, geometry and calculus is shown through Fibonacci sequence, golden section and logarithmic spiral. In this two-part article, we discuss how simple growth models based on these entities may be used to explain numbers and curves abundantly found in nature  相似文献   

从美军观察组看抗战后期美国对中共政策     

雍婷婷 《齐齐哈尔师范高等专科学校学报》2011,(1):107-108

1944年美国向延安派遣了一个军事观察组,代号＂迪克西使团＂,与中共取得了直接的接触,但是,美军观察组的派遣,并不意味着美国放弃片面的扶蒋联共政策,开始对中共进行军事援助,而是试图以联合中共作为向蒋介石施加压力的手段,以促使蒋改革内政,成为控制中国的唯一政治力量,避免中国内战的爆发,从而达到控制中国及保持远东稳定的目标。  相似文献   

平衡剖面技术在海拉尔盆地构造演化中的应用     

赵海燕  李杭兵  范广鹏 《石家庄职业技术学院学报》2011,23(2):55-57

利用平衡剖面技术以w2测线发育过程中的中间阶段为例,对乌尔逊凹陷的构造演化进行了分析,认为大磨拐河组沉积时期为稳定拉张阶段,主要受古地形控制;伊敏组沉积时期为断陷萎缩阶段.平衡剖面技术的应用有助于进行地质构造解释与选择油气勘探目标.  相似文献   

Error analysis of non-spherical raindrops on precipitation measurement     

解亚楠  周星里  杨正得 《上海大学学报(英文版)》2011,15(2):92-95

Radar cross section (RCS) of non-spherical raindrops is calculated by using the software CST based on finite integral method and compared with RCS of spherical raindrops. The revised factor of non-spherical raindrops is obtained. The radar reflectivity with precipitation change of four distribution models of M-P, Gamma, JD and JT combining the revised factor is gotten using trapezoidal integration. When the influence of non-spherical raindrops is considered, the accuracy of precipitation measurement of four distribution models can be separately improved 8.77%, 8.47%, 10.53% and 8.04% in the case of rain intensity is 100 mm/h.  相似文献