Transistors — From point contact to single electron

This article presents a historical account of the development of electronic devices along with an appreciation for the physics of semiconductors. Starting at the turn of the century with the work of J C Bose on Galena, the article leads us to recent low temperature experiments at IBM to demonstrate single electron transistors.     

A Post/Decolonial View of Race and Identity Through the Narratives of U.S. International Students from the Global South

Using postcolonial and decolonial theory as a framework, this study focuses on the lived experiences of international students of color entering the United States for the first time in their lives from the global South. Our goal was to understand how they communicate/perform their dis/located identities in relation to “race” when immersed for the first time in a White settler society context. Findings from this qualitative study underscore discomfort with U.S.-centric race logics, production of ambiguity in relation to identity and race, and the growth of compassion for cultural Others as a result of becoming racial Other. The decolonial implications of such dis-identification with U.S. colonial race categories are discussed.     

The 5I’s of Virtual Technologies in Laboratory Teaching for Faculties of Higher Education in Kerala

Journal of Science Education and Technology - In this paper, the effectiveness of training faculty in laboratory teaching (the teaching of science in a laboratory setting using experiments and...     

Aspirations of Indian inventors moderated by patenting experience,age and sector

In this hyper-competitive era, patents are an essential input to realizing sustainable competitive advantage. However, individual differences exist in patenting filing behavior and behaviors related to commercialization of patents. This study explores these behaviors in the context of three demographic variables. The demographic variables are patenting and commercialization experiences of inventors, age and sector. Further, aspirations of these inventors are assessed using external motivators of wealth, fame, and concern for societal welfare, and internal motivators such as pragmatism. The findings of this empirical study (n = 116) suggest that sector and age determine differences in personal internal motivators more than patent commercialization experience. Implications of the study are discussed.     

Sum and product separabilities of multivariable functions and applications

Necessary and sufficient conditions for reducibility of certain classes of multivariable polynomials are considered. The special case when a polynomial in that class can be factored into a finite product of single variable polynomials is investigated. A set of necessary and sufficient conditions for decomposing a multivariable p.r.f. into a sum of single variable p.r.f.'s is given. Examples to illustrate applications of sum and product separabilities of functions are given.     

Identification of a class of signals imbedded in high measurement noise

The Kalman filtering algorithm is used to identify a class of signals imbedded in high amplitude measurement noise. The considered class of signals is first modeled empirically as a nonlinear equation. The equation is then linearized and formulated as a Kalman filtering state estimation problem. Computer simulations yield excellent results for a variety of examples, a couple of which are presented in this paper.     

Equating Error and Statistical Bias in Small Sample Linear Equating

A resampling study was conducted to compare the statistical bias and standard errors of nonequivalent-groups linear test equating in small samples of examinees. Sample sizes of 15, 25, 50, and 100 were examined. One thousand samples of each size were drawn with replacement from each of 5 archival data files from teacher subject area tests. For each test, data files from 2 parallel forms were used. Results suggest trivial levels of equating bias even with small samples, but substantial increases in standard errors as sample size decreases. Results were interpreted in terms of applications to testing situations in which small numbers of examinees are available.     

Integrated teacher education programme for open distance learning: a model for development and implementation

Teacher education in India, including that offered by the open distance learning (ODL) system to thousands every year, imparts mainly pedagogic knowledge, although the need for integrated teacher education programmes has been underscored. As the Indira Gandhi National Open University (IGNOU), an ODL institution, will develop an integrated Bachelor of Education programme for secondary-level teachers, a model based on the Technological Pedagogical Content Knowledge (TPACK) framework has been proposed for developing and implementing it. The model takes cognisance of the systemic challenges to TPACK-based teacher education, but it does not envision radical changes in IGNOU’s teacher education framework for addressing these challenges. It includes propositions with theoretical underpinnings for redesigning the major components of the framework while retaining its basic structure. The model has been described in terms of its rationale, its structure and the way it envisages the progress of teacher trainees from a phase of learning with the help of self-learning material designed for imparting integrated theoretical knowledge to one whereby they apply such knowledge in simulated situations, and finally moving on to a phase of situated learning during internship.     

Preliminary studies on the detection ofMycobacterium avium-intracellulare complex using DNA probe from a clinical isolate

Genomic DNA from a clinical isolate ofMycobacterium avium-intracellulare complex was purified and cloned in PBR 322 at the tetracycline resistance site using Bam HI restriction enzyme. A 16 kb cloned fragment was purified, radiolabeled and used as a probe. Genomic DNA isolated from nineteen MAC strains, threeM. tuberculosis strains and oneM. kansasii strain were digested with Eco RI restriction enzyme, Southern blotted and hybridized with the 16 kb cloned and labeled fragment. Twelve MAC strains showed positive hybridization although five strains gave faint signals. Positive hybridization was noted in two out of the threeM. tuberculosis strains, possibly due to shared DNA homology. No signal was received from the singleM. kansasii strain used in this study.