排序方式： 共有29条查询结果，搜索用时 31 毫秒
1.
B. M. Deb Mainak Sadhukhan Sudarson Sekhar Sinha Sucheta Sengupta Ranjit Biswas 《Resonance》2008,13(1):54-80
In this article we discuss an exciting experiment in non-linear dynamics. This provides an imaginative platform for bringing
in chemical, physical, biological, mathematical and computational sciences together. There are implications for earth sciences
as well.
B M Deb is a theoretical chemist who has been designing experiments for chemistry teaching laboratories for more than thirty
years.
Mainak Sadhukhan, Sudarson Sekhar Sinha and Sucheta Sengupta were students of PBIR-Chemical Sciences. Ranjit Biswas is a physical
chemist working on both theory and experiment in chemical dynamics. 相似文献
2.
Miwa A. Takeuchi Pratim Sengupta Marie-Claire Shanahan Jennifer D. Adams Maryam Hachem 《Studies in Science Education》2020,56(2):213-253
ABSTRACT Science, Technology, Engineering and Mathematics (STEM) education garnered significant attention in recent years and has emerged as a key field of research globally. The goal of this article is to offer a critical review of how STEM education and its transdisciplinarity were defined and/or positioned in empirical studies published during the early formulation of the field. In particular, we sought to identify how these studies conceptualise learners and learning and portray the underlying assumptions in light of the macrosystemic discourses that often serve as ideological forces in shaping research and practice of STEM education. We examined 154 peer-reviewed articles published between January 2007 and March 2018 and analysed them along several emergent dimensions: their geospatial focus, focal disciplinary areas, methodological and theoretical assumptions, and major findings. Grounded in a critical transdisciplinary perspective, we used critical discourse analysis to identify how macrosystemic and institutionalised forces – overtly and implicitly – shape what counts as STEM education research, including its goals and conceptualisations of learners and learning. Our analysis highlights the need for aesthetic expansion and diversification of STEM education research by challenging the disciplinary hegemonies and calls for reorienting the focus away from human capital discourse. 相似文献
3.
In the age of digital networks and databases, gathering data is no longer a differentiating attribute. Instead, the onus is upon creating knowledge and codifying it into the organizational routine. The central theme of this paper is to offer a systematic knowledge codification routine that embodies specific agent attributes and best re-engineering practices. The knowledge process re-engineering schema is proposed as a routine comprising extraction, transformation, and loading to encompass seeking knowledge inputs, converting them based on context, and codifying knowledge for organizational reuse. Using the organization as the primary unit of analysis, the scope of our discussion explicates an agent-mediated process re-engineering model of knowledge creation and codification. The proposed re-engineering captures the synthetic transformation of data into information, information into explicit knowledge, the use of explicit knowledge as an input to tacit knowledge, and the codification of tacit knowledge into explicit knowledge in an attempt to shift the ownership and control of knowledge from the individual to the organization. 相似文献
4.
Subir Sengupta 《Communication Research Reports》2013,30(2):210-220
The increasing use of light‐complexioned black models with Caucasian features in ads has been roundly criticized. This study was designed to test if black female models with Caucasian features are more effective in ads than black models with “classical” features. A 2×2 factorial design was used with two models (mixed‐race and “classical” black) and two products (beauty‐related and beauty‐unrelated). MANOVA tests showed that regardless of the type of product, the type of model did not make a significant difference on the measures of advertising effectiveness. Neither were the interaction effects significant. 相似文献
5.
D. P. Sengupta 《Resonance》2000,5(1):60-70
This article, as the title suggests, highlights the contributions of Edison in lighting up the world and harnessing electricity to do the job. 相似文献
6.
Angom Ranjana Devi Mahuya Sengupta Dipu Mani Barman Yashmin Choudhury 《Indian journal of clinical biochemistry : IJCB》2021,36(3):296
Nicotine, responsible for the addictive properties of tobacco, is widely used in nicotine replacement therapy for tobacco use cessation. We investigated the time-dependent effect of treatment with nicotine on the tumor suppressor, DNA repair and immune responses. Swiss Albino mice (laca strain) of both sexes received nicotine dissolved at a dose of 100 µg/ml in 2% sucrose for 24 weeks, by oral gavage, while age- and gender-matched controls received only 2% sucrose for the same period. Nicotine-treated and control mice were sacrificed 6, 16 and 24 weeks post-treatment, and their tissues evaluated for alterations in histology, oxidative stress, TNF-α levels, nitric oxide (NO) and myeloperoxidase (MPO) release, tumor suppressor response and DNA repair response. Statistical significance of results was determined using Students’ t test. The tissues of nicotine treated mice exhibited a large number of multinucleated and binucleated cells, enlarged nuclei and non-uniform distribution of cells, significant increase in expression of TNF-α gene and serum TNF-α, and time-dependent significant increase in lipid peroxidation, protein carbonylation, NO and MPO release when compared to age-and gender-matched controls. The mRNA expression of the tumor suppressor gene p53, its primary regulator Mdm2, and the DNA repair genes Brca2 and Ape1 were significantly elevated, but the corresponding protein levels remained largely unaltered. In conclusion, treatment with nicotine caused oxidative stress and inflammation which can cause widespread cellular damage from the very onset of treatment, without subverting the tumor suppressor and DNA repair responses.Electronic supplementary materialThe online version of this article (10.1007/s12291-020-00903-8) contains supplementary material, which is available to authorized users. 相似文献
7.
Sujan Sengupta 《Resonance》2016,21(7):641-652
Is there life anywhere else in the vast cosmos? Are there planets similar to the Earth? For centuries, these questions baffled curious minds. Either a positive or negative answer, if found one day, would carry a deep philosophical significance for our very existence in the universe. Although the search for extra-terrestrial intelligence was initiated decades ago, a systematic scientific and global quest towards achieving a convincing answer began in 1995 with the discovery of the first confirmed planet orbiting around the solar-type star 51 Pegasi. Since then, astronomers have discovered many exoplanets using two main techniques, radial velocity and transit measurements. In the first part of this article, we shall describe the different astronomical methods through which the extrasolar planets of various kinds are discovered. In the second part of the article we shall discuss the various kinds of exoplanets, in particular about the habitable planets discovered till date and the present status of our search for a habitable planet similar to the Earth. 相似文献
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9.
Over the past two decades, both developed and developing countries have been investing a significant portion of their resources in the creation of an information infrastructure. However, speculation abounds regarding the efficacy of information infrastructure investments, especially when the opportunity cost for investing in information technology (IT) is measurably high among developing nations. This longitudinal study introduces and explores infrastructure development and service-sector growth as key metrics for IT investment success. It also traces the notional evidence of IT infrastructure development as mediating the causal relationship between information infrastructure investments and service-sector growth. Using data from low-income, middle-income, and high-income countries, the mediating and lagged impact of information infrastructure on service-sector growth reveals that information infrastructure development does play a significant role as a mediator. It points out that information infrastructure investments can be a misleading causal antecedent if countries fail to develop their infrastructure. It also provides evidence of a recursive relationship between infrastructure development and service-sector growth. An exploratory time-series analysis across different country categories suggests that information infrastructures must be properly developed to reconcile the paradox. In addition, exploratory tests reveal a distinct divergence between infrastructure investments and infrastructure development among different country tiers. 相似文献
10.
Bacterial resistance to antibiotics poses a serious challenge to the prospect of chemotherapy. Rational use of antibiotics
is most desirable but it cannot provide a permanent solution to the problem. In this article the biochemical and genetic basis
of antibiotic resistance in bacteria is discussed with examples. The non-clinical aspects of antibiotic-resistance are also
dealt with in brief. 相似文献