A Framework for Analysis of Teachers’ Geometric Content Knowledge and Geometric Knowledge for Teaching     

Mohan?ChinnappanEmail author  Michael?J.?Lawson 《Journal of Mathematics Teacher Education》2005,8(3):197-221

Current reform-driven mathematics documents stress the need for teachers to provide learning environments in which students will be challenged to engage with mathematics concepts and extend their understandings in meaningful ways (e.g., National Council of Teachers of Mathematics, 2000, Curriculum and evaluation standards for school mathematics. Reston, VA: The Council). The type of rich learning contexts that are envisaged by such reforms are predicated on a number of factors, not the least of which is the quality of teachers’ experience and knowledge in the domain of mathematics. Although the study of teacher knowledge has received considerable attention, there is less information about the teachers’ content knowledge that impacts on classroom practice. Ball (2000, Journal of Teacher Education, 51(3), 241–247) suggested that teachers’ need to ‘deconstruct’ their content knowledge into more visible forms that would help children make connections with their previous understandings and experiences. The documenting of teachers’ content knowledge for teaching has received little attention in debates about teacher knowledge. In particular, there is limited information about how we might go about systematically characterising the key dimensions of quality of teachers’ mathematics knowledge for teaching and connections among these dimensions. In this paper we describe a framework for describing and analysing the quality of teachers’ content knowledge for teaching in one area within the domain of geometry. An example of use of this framework is then developed for the case of two teachers’ knowledge of the concept ‘square’.  相似文献   

Markov chain Monte Carlo methods     

K. B. Athreya  Mohan Delampady  T. Krishnan 《Resonance》2003,8(10):8-19

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Conservation of a room: A treatment proposal for Mark Rothko's Harvard Murals     

Jens Stenger  Narayan Khandekar  Ramesh Raskar  Santiago Cuellar  Ankit Mohan  Rudolf Gschwind 《文物保护研究》2016,61(6):348-361

A treatment with projected light for Mark Rothko's Harvard Murals (1962) is proposed. The group of five paintings on canvas has changed color due to the presence of a fugitive red pigment and excessive exposure to natural light in a room with large windows. For the conservation of Rothko's Harvard room, it is brought into context within his other commissions and environments. The original color of the works is determined by the digital restoration of contemporary photographs. With a camera projector system a compensation image is calculated that is projected onto the original canvas resulting in a restored color appearance. This approach of inpainting with light is compared with considerations of cleaning and inpainting in conventional conservation treatments. Overall lighting and architecture including the unusual wall color carefully chosen by Rothko play a key role in the treatment of the Mural cycle as an environment.  相似文献   

The sun’s mysteries from space - I     

B.?N.?DwivediEmail author  A.?Mohan 《Resonance》2004,9(12):14-24

This article in two parts presents a brief overview of the Sun’s mysteries revealed from space observations, using recent solar spacecrafts: Yohkoh, SOHO, TRACE and RHESSI.  相似文献   

Clinical utility of serum thyroglobulin in acute haemorrhage into the thyroid     

A. Kumar  D. H. Shah  U. Vijayan  S. R. Dandekar  B. A. Krishna  S. M. Sharma 《Indian journal of clinical biochemistry : IJCB》1994,9(1):19-20

Seven cases of suspected haemorrhage In pre-existing adenoma or cyst in the thyroid showed serum thyroglobulin (tg) levels phenomenonly elevated. The serum tg leveis reduced remarkably within one to three montha. During this period all patients were treated with thyroxin. It is concluded that serial serum thyroglobulin determinations may be useful in confirming the clinical suspicion of haemorrhage in the thyroid.  相似文献   

学缘和海归教师学术职业发展--一项基于上海高校的混合研究     

吴菡  朱佳妮  周默涵 《复旦教育论坛》2020,18(2):51-57

学缘对教师学术职业发展有重要影响,而海归教师因同时拥有国内和海外二元学术关系网络而在学缘上表现出特殊性。本研究采用混合研究方法,在量化部分以上海21所高校的359位海归教师为样本,在质性部分对来自上海6所高校的10名海归教师开展一对一半结构访谈,共同探究学缘对海归教师学术职业发展的影响。研究发现:高校海归教师对自身学术职业发展现状的评价不高;学缘影响海归教师学术职业平台选择以及职业"入场券"的获得。"校缘"对海归教师学术职业发展影响不显著,但与海外导师联系的频率对海归教师学术职业发展有显著正向影响。研究最后从高校、学院和个体层面对促进高校海归教师学术职业发展提出政策建议。  相似文献   

Spectrum of monoclonal gammapathies in Andhra Pradesh     

T. Malati  B. Yadagiri  D. Murali Mohan Krishna  V. Shantaram  D. Raghunadharao  K. Subbarao 《Indian journal of clinical biochemistry : IJCB》2001,16(1):52-59

In the present study, monoclonal gammapathy was identified in a total of 245 patients of plasma cell dyscrasias during period of 1987 to 2000. The monoclonal band was identified in serum by agar gel electrophoresis in all the cases and in urine in a few cases. Characterization of paraprotein (monoclonal immunoglobulin class and light chain type) was carried out by employing immunoelectrophoresis and/or immunofixation electrophoresis using heavy chain specific gamma, alpha, mu, delta and epsilon and light chain specific kappa (K), lambda (λ) antisera. Serum immunoglobulins Ig G, Ig A, and Ig M were estimated by immunoturbidometry. Serum urea, creatinine, uric acid, alkaline phosphatase, total proteins, albumin, calcium and phosphorus were estimated by using routine biochemical methods. Among the 245 cases, 73.1% monoclonal gammapathies were of secretory type and 7.3% were non-secretory. Monoclonal gammapathies were associated with 80.4% of multiple myeloma, 8.9% of solitary plasmacytoma, 4.1% of extra-medullary plasmacytoma, 3.3% of lymphoma and 2.9% of plasma cell leukemia. Classification of secretory monoclonal immunoglobulin revealed monoclonal immunoglobulin Ig G in 74%, Ig A 15% and Ig M in 2.9% cases.  相似文献   

Tissue plasminogen activator (A review)     

Rukmini Darad  Mohan W. Nulkar  Arun R. Pawse 《Indian journal of clinical biochemistry : IJCB》1991,6(1):1-8

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Serum fructosamine in a random group of adult onset diabetics of Indian subpopulation     

Tangirala Malati Ph. D.  D. Murali Mohan Krishna  B. Sadasivudu 《Indian journal of clinical biochemistry : IJCB》1991,6(1):51-57

Serum fructosamine (SFRC) was estimated using single colour reading procedure in 50 normals and 160 adult onset random diabetics. Serum fructosamine levels were observed to be 1.86±0.321 m moles/L (Range 1.0 to 2.4) and 3.44±0.671 (Range 2.0 to 5.7) in normal and diabetic subjects respectively. Serum fructosamine levels as determined by the method adapted, were found to be unaffected by a transient rise in serum glucose levels during an oral glucose tolerance test. Significantly elevated SFRC concentration was also seen in diabetic groups in spite of different combinations of antidiabetic treatment. Attempts to correlate SFRC with duration and secondary complications of diabetes did show significant elevation in all the groups irrespective of duration and complications thus indicating poor glycemic control.  相似文献   

Estimation of Upper Limit of Normal for Serum Alanine Transaminase in Healthy South Indian Population     

Pazhanivel Mohan  Varun Sundar  Emmanuel Bhaskar  Syluvai Anthony 《Indian journal of clinical biochemistry : IJCB》2017,32(3):337-342

Alanine aminotransferase (ALT) is the most common and cost effective screening test for asymptomatic liver disease. There is paucity of data on normal ALT among healthy individuals in India. An observational cross sectional study was conducted from January to July 2013 to estimate the upper limit of normal for ALT in healthy south Indian population. Adults undergoing voluntary or pre-employment health screening were included. Those with current and past alcoholism or smoking, acute illness or hospitalization during preceding 12 months, non-steroidal anti-inflammatory or over the counter medication use within a month, current or past intake of herbal medications, any chronic medical illness, abnormal body mass index (BMI), fatty liver in ultrasound, abnormality in haemoglobin, platelet count, blood sugar, creatinine, lipid profile and thyroid function test and positive serology (Hepatitis B, C or HIV) were excluded. A total of 2600 subjects were screened. 344 were included for analysis. Mean age was 35 years in men and 34.83 years in women, with a mean BMI of 22.2 kg/m² in men and 21.8 kg/m² in women. The mean ALT in men and women were 21.87 ± 2.9 (97.5th percentile 28 U/L) and 19.35 ± 3.3 (97.5th percentile 24 U/L) respectively. In conclusion, mean and upper limit of ALT (97.5th percentile) in south Indian men was 21.87 and 28 IU/L and women were 19.35 and 24 IU/L respectively. There is a need to re-consider ALT levels in our population for better detection of individuals at risk for liver disease.  相似文献