共查询到20条相似文献,搜索用时 15 毫秒
1.
Amitabh Joshi 《Resonance》2008,13(9):812-835
The year 2008 marks the 150th anniversary of the debut of the concept of natural selection as a mechanism of adaptive evolution
through the reading of papers by Darwin and Wallace to the Linnaean Society. It also marks the 100th anniversary of the enunciation
of the principle defining the inertial state of populations from a genetic viewpoint through the independent publication of
papers on the topic by G H Hardy and W Weinberg. In this four-part series, we will examine the significance of the Hardy-Weinberg
Equilibrium as a basic model of population genetics that, in turn, forms the foundation for evolutionary genetics. In Part
I of this series, we first discuss the historical backdrop to the work of Hardy and Weinberg, and introduce the basic notion
of genetic equilibrium. 相似文献
2.
Amitabh Joshi 《Resonance》2011,16(2):116-128
The year 2008 marked the 150th anniversary of the debut of the concept of natural selection as a mechanism of adaptive evolution
through the reading of papers by Darwin and Wallace to the Linnaean Society. It also marked the 100th anniversary of the enunciation
of the principle defining the inertial state of populations from a genetic viewpoint through the independent publication of
papers on the topic by G H Hardy and W Weinberg. In this series, we examine the significance of the Hardy-Weinberg Equilibrium
as a basic model of population genetics that forms the foundation for evolutionary genetics. In Part 3 of this series, we
begin to relax some of the assumptions of the basic model underlying the Hardy-Weinberg Equilibrium, and analyse the situations
where either mutation or migration occur in an otherwise ideal large population. 相似文献
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Dinitrogen (N2) is a very stable and inert molecule due to the formation of a triple bond between the two atoms. Surprisingly isoelectronic
molecules are quite reactive making dinitrogen very useful and unique. 相似文献
7.
In this article we first consider the importance of prediction of the monsoon, and events such as the intense rainfall event
over Mumbai in July 2005. We then discuss how meteorologists make short-, medium-, and long-range forecasts and the concept
of the limit of predictability in a chaotic system such as the atmosphere. Problems and prospects of prediction on different
time-scales are discussed by using one example of short-range forecasts and the prediction of the monsoon by dynamical and
statistical methods. Finally we consider measures of the skill of a forecast and how high the skill has to be for it to be
useful for applications. 相似文献
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V. V. Raman 《Resonance》2008,13(11):1074-1081
11.
P. K. Basu 《Resonance》2007,12(10):37-46
The increased use of optoelectronic devicessuch as TV screens and computer monitors in everyday life, calls for a material
on which integration of all circuits may be performed. Silicon, the most widely used material in electronics, has limited
application in optoelectronics due to its poor light emission property. In this article, the need for silicon photonics in
present day ICs, and communication, the reason for its inefficient light emission, and recent breakthrough in the form of
Si Raman laser are discussed. 相似文献
12.
Ashitava Ghosal 《Resonance》2010,15(8):699-710
Ferdinand Freudenstein is widely acknowledged to be the father of modern kinematics of mechanisms and machines. His PhD thesis
in 1954 and subsequent research papers by him and his students have influenced academic and industrial research, teaching
and practice related to the analysis and design of mechanisms and machines throughout the world. In this article, we revisit
Freudenstein’s thesis and the equation named after him. The Freudenstein equation results from an analytical approach towards
analysis and design of four-link mechanisms which, along with its variants, are present in a large number of machines used
in daily life. 相似文献
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Tanu Mimani 《Resonance》2011,16(12):1324-1332
The novel ‘solution combustion method’ or ‘fire synthesis’ has been used to make high temperature synthesised ceramic materials.
The process, which can be initiated at low temperature, is self-propagating and gas-producing. Fine-particle alumina and its
related oxides can be easily prepared in bulk by the redox mixture method. 相似文献
15.
Dipanjan Ghosh 《Resonance》2011,16(1):47-60
Mangroves, an exclusive group of plants with remarkable ecological importance, inhabit mostly the zones washed by the back
and forth movement of tides. They are disappearing rapidly from their natural habitat due to various reasons. Mangroves create
a unique ecological environment that is composed of rich assemblages of species. Economic importance of mangroves is also
noteworthy. 相似文献
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V. Rajaraman 《Resonance》2000,5(10):13-23
In this part of the series, we define different types of e-commerce and list their advantages and disadvantages 相似文献
18.
In Part 1 of this two-part article we have spelt out, in some detail, the link between symmetries and conservation principles
in the Lagrangian and Hamiltonian formulations of classical mechanics (CM). In this second part, we turn our attention to
the corresponding question in quantum mechanics (QM). The generalization we embark upon will proceed in two directions: from
the classical formulation to the quantum mechanical one, and from a single (infinitesimal) symmetry to a multi-dimensional
Lie group of symmetries. Of course, we always have some definite physical system in mind. We also assume that the reader is
familiar with the elements of quantum mechanics at the level of a standard first course on the subject. Operators will be
denoted with an overhead caret, e.g., $
\hat A,\hat G,\hat U
$
\hat A,\hat G,\hat U
, etc., while $
[\hat A,\hat B] = \hat A\hat B - \hat B\hat A
$
[\hat A,\hat B] = \hat A\hat B - \hat B\hat A
is the commutator of $
\hat A
$
\hat A
and $
\hat B
$
\hat B
. 相似文献
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In this article we have seen how the principles of quantum physics can be exploited in making a computational device. However, we still haven’t seen the kind of algorithms a quantum computer would use and how they would be different from traditional algorithms. We will look at these issues in the next part of this article, with the help of Shor’s famous factorization algorithm. We will also briefly mention some practical issues and the progress achieved so far. 相似文献