4,734 Result(s)
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Chapter
Distribution de L’energie Dans Le Spectre Ultraviolet de Quelques Étoiles
On donne les résultats préliminaires des comparaisons directes entre quelques étoiles, O, B (et également de α Lyr) et une source terrestre préalablement rapportée au corps noir. Il semble que les gradients ul...
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Chapter and Conference Paper
Spectrophotometric Study of the Continuous Spectrum of Nova Cygni 1975 (V 1500 Cyg)
A l’aide d’un spectromètre á réseau tournant (2,5 Å de résolution) au foyer Cassegrain du télescope de 80 cm à l’Observatoire de Haute Provence, nous avons observé la Nova Cygni 1975 du 3 au 12 Septembre 1975,...
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Chapter
Numerical Weather Prediction Relevant to the Monsoon Problem
In this short paper we have identified some of the modelling groups that have the capability of simulating or carrying out short range numerical weather prediction over the monsoon belt. We have next outlined ...
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Chapter and Conference Paper
Conception et optimisation des descentes recursives
On introduit une nouvelle famille d'automates à pile, appelés automates simples, adaptés à la conception systématique et aux manipulations formelles des analyseurs de descente récursive déterministes. Ces auto...
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Chapter
Digital Reconstruction of Acoustic Holograms in the Space Domain with a Vector Space Approximation
We have developed a computer-assisted ultrasonic underwater imaging system. Until recently, we used back-propagation to reconstruct images. This method, accurate both in the near and far fields of the object, ...
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Chapter
Approximate Solution of Integral Equations and Differential Equations
If \( \sum\limits_{i = 1}^s {\sum\limits_{j = 1}^s {{\alpha_{ij}}{x_i}{x_j}\left( {{\alpha_{ij}} = {\alpha_{ji}}} \right)} } \) is a sem...
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Chapter and Conference Paper
Transformation and Distribution of Organic and Inorganic Fertilizer Nitrogen in Rice and Soil System
Combined application of chemical fertilizer with farm manure is popularly practised in Chinese farming. In order to clarify the characteristics of nitrogen supply in this fertilization system, pot experiments ...
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Chapter
Algebraic Number Fields and Rational Approximation
Let Q denote the rational number field and α be an algebraic number of degree s. Then the algebraic number field F s = Q(α) is the field given by the polynomials in α of degree < s with rational coefficients.
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Chapter
Uniform Distribution
We use G s to denote the s-dimensional unit cube $$ 0 \leqslant {x_i} \leqslant 1,\quad 1 \leqslant i \leqslant s. $$ ...
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Chapter and Conference Paper
Soms- a second order monotone scheme for-shock capturing and its application to the solutions of compressible Navier-Stokes equations
This work proposes the SOMS- a Second Order Monotone Scheme for hydrodynamic calculations. This scheme combines a first order and second order accurate schemes using a new switch function. The SOMS has been ap...
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Chapter
Uniform Distribution and Numerical Integration
Let
(σ) $$ \begin{gathered} 0 = {x_0} < {x_i} < ... < {x_l} = 1, \hfill \\ 0 = {y_0} < {y_1} < ... < {y_m} = 1 \hfill \\ \end{gathered} ... -
Chapter
Numerical Integration of Periodic Functions
Suppose that α > 1. Then
(7.1) $$ \mathop {\sup }\limits_{f \in E_s^a\left( C \right)} \left| {\int\limits_{{G_S}} {f\left( x \right)dx ... -
Chapter
Interpolation
Let 1 < n1<n2 ... be a sequence of integers and let $$ {P_{{n_l}}}(k) = \left( {{x_1}^{\left( {{n^l}} \right)}(k),...,x_s^{\left( {{n_l}} \right)}(k)}...
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Chapter
Recurrence Relations and Rational Approximation
Let F s = Q(α) be a real algebraic number field of degree s. We shall give in this chapter an algorithm for the simultaneous Diophantine approximation obtained by η l = α
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Chapter
Estimation of Discrepancy
Suppose that s ≥ 2, m1,..., m s are s positive integers, n = m1 ... m s and m = min (m1, ..., m s ). The set
(4.1) ... -
Chapter
Periodic Functions
The G s may be regarded as tori. The 1-dimensional torus G1 may be obtained by identifying two end-points of the unit interval 0 ≤ x1 ≤ 1 and G2 by indentifying 2 opposite sides of the ...
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Chapter
Numerical Error for Quadrature Formula
We introduce the notations $$ s\left( {n,\gamma, f} \right) = \int\limits_{{G_s}} {f(x)dx - \frac{1}{n}\sum\limits_{k - 1}^n {f\left( {\frac{{kh}}{n}}...
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Chapter
Non-Euclidean Geometry
In Chapter 3 we saw that the group G which we have been discussing is formed from the transformation
1 $$ y = \frac{{xT + xx'{v_1} + {v_... -
Chapter
Extended Space and Spherical Geometry
So far we have generalized from the unit disc to the unit ball. Now we shall take the whole plane (the Gaussian plane together with the point at infinity) and the Möbius group which acts on the plane and gener...
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Chapter
A Mutant of Rhizobium Japonicum 110 with Elevated Nif Activity in Free-Living Culture
The enhancement of biological nitrogen fixation in the legume-Rhizobium symbiosis involves selection strategies at both the plant and symbiont level to identify and define traits suitable for improving the symbio...
