Chemistry for whom? Gender awareness in teaching and learning chemistry     

Kristina Andersson 《Cultural Studies of Science Education》2017,12(2):425-433

Marie Ståhl and Anita Hussénius have defined what discourses dominate national tests in chemistry for Grade 9 in Sweden by using feminist, critical didactic perspectives. This response seeks to expand the results in Ståhl and Hussénius’s article Chemistry inside an epistemological community box!—Discursive exclusions and inclusions in the Swedish national tests in chemistry, by using different facets of gender awareness. The first facet—Gender awareness in relations to the test designers’ own conceptions—highlighted how the gender order where women are subordinated men becomes visible in the national tests as a consequence of the test designers internalized conceptions. The second facet—Gender awareness in relation to chemistry—discussed the hierarchy between discourses within chemistry. The third facet—Gender awareness in relation to students—problematized chemistry in relation to the students’ identity formation. In summary, I suggest that the different discourses can open up new ways to interpret chemistry and perhaps dismantle the hegemonic chemistry discourse.  相似文献   

Heisenberg’s invention of matrices     

Pradeep Kumar 《Resonance》2017,22(4):399-405

Richard Feynman once said: “nobody understands quantum mechanics”. Still, those who devised it are perhaps the ones closest to understanding their creation. It suggests that whenever the weirdness of quantum mechanics haunts you, it is better to go back to its creators in terms of their original publications. In the present article, the author has tried to seek help from Heisenberg’s 1925 paper, in order to reduce the weirdness of going from classical observables to quantum operators.  相似文献   

Channel adaptive rate control for energy optimization     

Blanch Carolina  Pollin Sofie  Lafruit Gauthier  Eberle Wolfgang 《浙江大学学报(A卷英文版)》2006,7(1):82-88

Low energy consumption is one of the main challenges for wireless video transmission on battery limited devices. The energy invested at the lower layers of the protocol stack involved in data communication, such as link and physical layer, represent an important part of the total energy consumption. This communication energy highly depends on the channel conditions and on the transmission data rate. Traditionally, video coding is unaware of varying channel conditions. In this paper, we propose a cross-layer approach in which the rate control mechanism of the video codec becomes channel-aware and steers the instantaneous output rate according to the channel conditions to reduce the communication energy. Our results show that energy savings of up to 30% can be obtained with a reduction of barely 0.1 dB on the average video quality. The impact of feedback delays is shown to be small. In addition, this adaptive mechanism has low complexity, which makes it suitable for real-time applications.  相似文献   

外语教学中跨文化交际能力培养策略     

王成  李丽 《黄石理工学院学报(人文社科版)》2007,24(4):99-102

语言与社会和文化有密切的联系,语言的使用离不开作为社会和文化成员的人以及使用语言的环境.外语交际双方来源于不同的文化背景,外语交际能力实际上是一种跨文化的交际能力.文章从语言与文化的关系和由文化因素产生的母语与外语之间的差异入手,阐述外语教学中文化传授的必要性,并说明外语教学的重点应尽快从语言系统本身转到语言的功能上来.  相似文献   

A Novel Whiteheadean Science Program for 14-16 Year Olds in England and Wales     

Michael Akeroyd 《Interchange》2007,38(2):167-173

A novel “Whiteheadean” science program was initiated in England and Wales in September 2006. Following a critical House of Commons report in 2002, the government altered the National Curriculum targets and thus forced the Examination Boards to alter their specifications in order to come in line. Assessment at GCSE level (i.e., the 14-16 year cohort) was criticised for: a) failing to inspire students to continue with science, b) discouraging students from thinking for themselves, c) neglecting contemporary science, d) lacking flexibility, and e) making practical work into a tedious and dull activity. The British government has insisted that all pupils in state funded schools must know the names of some modern scientists and their work. They must discuss some current scientific problems. History and philosophy of science is included under the topic heading “How Science Works.” In Chemistry these objectives have destroyed the traditional linear top-down sequential approach of teaching into an approach based more closely on Whiteheadean lines (cf., the ideas expressed in The Aims of Education, 1926, Chapters 1-3).  相似文献   

模糊语言的构成特点及其翻译     

金丽  杨利军 《怀化学院学报》2007,26(9):74-76

翻译研究的发展离不开其他一些相关学科的研究成果。国内外模糊语言学的研究成果表明,语言模糊性与翻译有着密切的联系,模糊语言学和翻译学可以有机地结合起来,形成新的模糊翻译理论。分析了国内模糊翻译研究的现有成果,讨论了模糊语言现象的构成特点及翻译方法。  相似文献   

高职数学教学中应注意培养学生的数学素质     

李超任 《北京工业职业技术学院学报》2003,(4)

数学素质是人的素质中重要的成分之一,这种素质要靠后天的培养才能形成。其内涵主要是指人认识和处理数量关系、空间形成的内在规律,逻辑关系及抽象模式的悟性与潜能。高职教育的数学教学应注意培养学生这种悟性和潜能。这对提高人的全面素质必将起到无可替代的作用。  相似文献   

论"三个代表"的系统思维特征     

李永胜 《乌鲁木齐职业大学学报》2007,16(1):10-12

“三个代表”重要思想作为当代中国的马克思主义,具有鲜明的时代性。它是运用当代科学思维范式--系统思维方法分析、研究并创造性地解决当代中国改革开放实践所面临的重大现实问题的产物,具有明显的系统思维特征,体现在它的开放性思维特征、整体性思维特征、复杂性思维特征、协调性思维特征、人民本位的主体性思维特征等方面。  相似文献   

Random vibration analysis of switching apparatus based on Monte Carlo method     

ZHAI Guo-fu CHEN Yang-hua REN Wan-bin 《浙江大学学报(A卷英文版)》2007,8(3):422-425

The performance in vibration environment of switching apparatus containing mechanical contact is an important element when judging the apparatus’s reliability. A piecewise linear two-degrees-of-freedom mathematical model considering contact loss was built in this work, and the vibration performance of the model under random external Gaussian white noise excitation was investigated by using Monte Carlo simulation in Matlab/Simulink. Simulation showed that the spectral content and statistical characters of the contact force coincided strongly with reality. The random vibration character of the contact system was solved using time (numerical) domain simulation in this paper. Conclusions reached here are of great importance for reliability design of switching apparatus.  相似文献   

水稻免耕栽培生理基础——Ⅱ.免耕水稻的光合特性     

李小林  王永锐 《中山大学学报论丛》1989,(5)

威优64、陆青早1号作为试验材料,免耕能提高功能叶的光合速率、生育前期功能叶的呼吸强度、绿叶面积、叶绿素和可溶性蛋白含量,并延缓它们在生育后期的下降速率,降低后期功能叶的呼吸速率。主分量分析说明,在研究光合作用时,光合强度、叶绿素、可溶性蛋白质、叶片含氮量,可以任意选择一个作为光合特性指际。粒/叶比说明,免耕对源的改善较对库的改善较好些。  相似文献