Nature watch     

T R Shankar Raman 《Resonance》1996,1(7):52-61

Deer are some of the commonest, most visible, and attractive mammals in many forests and grasslands of India. They display a fascinating variety in their antlers, social systems, herd-forming behaviour, and ecology. Unfortunately, several factors have brought some species to the brink of extinction today.  相似文献   

Platform War vs. Platform Synergy? A Longitudinal Analysis of Media Substitution between Personal Computers and Mobile Devices     

Su Jung Kim  Vijay Viswanathan  Hye Mi Lee 《广播与电子媒介杂志》2020,64(2):65-88

ABSTRACT

Research on media substitution theory has examined substitutional and/or complementary relationships between new and existing media. This study focuses on the growth of mobile platforms and investigates the relationship between mobile devices and personal computers. Using Nielsen’s panel data that provide electronically recorded media usage (N = 2,396), this study analyzes yearly changes in time allocation to mobile devices and PCs at total and content-specific usage levels during mobile 4G transition. Results suggest a complementarity dynamic between mobile devices and PCs; however, the patterns were more nuanced in light of the role of individual and structural factors when determining media choice.  相似文献   

International Conference on Algebra and Geometry from 7th–14th December 2001     

H. S. Mukunda  Shiva Shankar 《Resonance》2001,6(9):112-112

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Error correcting codes     

Priti Shankar 《Resonance》1996,1(10):26-36

Linear algebraic codes are an elegant illustration of the power of Algebra. We introduce linear codes, and try to explain how the structure present in these codes permits easy implementation of encoding and decoding schemes.  相似文献   

A new method for the measurement and analysis of biomechanical energy delivered by kicking     

Karthik Ram Ramakrishnan  Hongxu Wang  Krishna Shankar  Alan Fien 《Sports Engineering》2018,21(1):53-62

An accurate measurement of force and biomechanical energy that people can impart through kicking is useful for kick-related sports training. Existing methods are indirect measurements or focus on force and not on the total energy of the kick. A kick test rig was designed, constructed and instrumented to measure the force and displacement of a vertical target subjected to kicking. The kick energy was calculated from the recorded force and displacement histories. The methodology for measurement of kick force and energy was validated by an open stance front kick test by 52 volunteers. The results showed that 67% of the participants could achieve an average energy above 100 J. An increasing trend of kick energy with increasing body weight of participant was observed. The participant’s gender had a strong influence on the kick energy, while training in martial arts does not appear to be a significant parameter. A probability analysis showed that one in one hundred adults will be able to kick with energies exceeding 215 J.  相似文献   

Nature watch     

P. N. Shankar  B. S. Shylaja 《Resonance》2001,6(8):82-89

In our previous article ‘On observing the night sky’¹ we had introduced the reader to the stars and constellations and suggested how they may be observed. In this article we will provide a few technical details, which we had deliberately left out earlier and also introduce the reader to a number of the other remarkable objects that may be seen in the sky.  相似文献   

Plant Growth Promoting Rhizobacteria   总被引：1，自引：0，他引：1  

Jay Shankar Singh 《Resonance》2013,18(3):275-281

Plant Growth Promoting Rhizobacteria (PGPR) are a group of bacteria that enhances plant growth and yield via various plant growth promoting substances as well as biofertilizers. Given the negative environmental impact of artificial fertilizers and their increasing costs, the use of beneficial soil microorganisms such as PGPR for sustainable and safe agriculture has increased globally during the last couple of decades. PGPR as biofertilizers are well recognized as efficient soil microbes for sustainable agriculture and hold great promise in the improvement of agriculture yields.  相似文献   

Ludwig Prandtl and boundary layers in fluid flow     

Jaywant H. Arakeri  P. N. Shankar 《Resonance》2000,5(12):48-63

In 1904, Prandtl proposed the concept of boundary layers that revolutionised the study of fluid mechanics. In this article we present the basic ideas of boundary layers and boundary-layer separation, a phenomenon that distinguishes streamlined from bluff bodies.  相似文献   

Archimedes     

P. N. Shankar 《Resonance》2006,11(10):3-5

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Temporal Trends of Malondialdehyde in Stored Human Plasma     

Arun Kumar  B. S. Dhillon  D. N. Rao  Geetha Menon  Hari Shankar  L. K. Dhaliwal  Maiti Leema  Nomita Chandhiok  Neeta Kumar  Rohini Sehgal  Suneeta Mittal  Sumitu Sahdev  Kandpal Shobha  V. L. Jindal 《Indian journal of clinical biochemistry : IJCB》2012,27(4):405-409

Malondialdehyde (MDA) is widely used as oxidative stress biomarker in biomedical research. Plasma is stored in deep freezers generally till analysis. Effect of such storage on MDA values, which may be variable and prolong, was incidentally observed in the ongoing study which is to estimate oxidative stress with oral iron. Plasma from blood samples of pregnant women (20–30 years age) in third trimester of singleton pregnancy (n = 139), consuming oral iron tablets was stored at −20 °C with intention of MDA estimation, as soon as possible. However logistic problems led this storage for prolonged and variable period (1–708 days). When values of MDA estimated using “Ohkawa” 79 method and readings were plotted against time to check the temporal effect, it showed a hyperbolic curve. Standard deviation (SD) was lowest when samples were tested within 3 weeks time. The samples analyzed within 3 weeks had mean ± SD value of 31.59 ± 26.11 μmol/L, while 123.7 ± 93.97 and 366.5 ± 189.8 μmol/L for samples stored for 1–3 and 4 months to 1 year respectively. Mean ± SD were 539.9 ± 196.8 in the samples store for more than a year. Rate of change in values was also lowest (0.0433 μmol/L/day) in the samples tested within first 3 weeks, which rose to 1.2 μmol/L/day during 3 month’s storage. This rate peaked at storage of 120 days (1.87 μmol/L/day) and fell to 0.502 μmol/L/day in the second year of storage. It is concluded that at −20 °C, only 3 weeks of storage time should be considered valid for fairly acceptable stability in MDA values.  相似文献