In a recent paper, Bourchard et al. [1] proposed the block sum transformation, a method intended as an alternative to the discrete Fourier transform (DFT), with application to the analysis of excited vibrations of linear systems. In this note, we mention the existence of a number of alternative algorithms for the computation of the DFT, and show that the block sum transformation is equivalent t...

In making the distinction between the muscular and discrete types of subvalvar aortic stenosis the assessment of the hemodynamic data is vital, but the criteria are unsatisfactory in a number of cases. Most reports dealing with the hamodynamic features (Brachfeld and Gorlin, 1959; Goodwin et al., 1960; Hancock, 1961; Boiteau and Allenstein, 1961; Brockenbrough, Braunwald, and Morrow, 1961; Boit...

The influence of aspect ratio and orientation to scattering properties of ellipsoid ice particles at 94GHz is studied by Discrete-Dipole Approximation (DDA) method. Absorption efficiency, scattering efficiency, asymmetry factor and backscattering efficiency are computed with aspect ratios vary from 0.2 to 1.0, whose size parameter range are selected from 0 to 5. It is found that the values of s...

We present a method of incorporating the discrete dipole approximation (DDA) method with the point matching method to formulate the T -matrix for modeling arbitrarily shaped micro-sized objects. The T -matrix elements are calculated using point matching between fields calculated using vector spherical wave functions and DDA. When applied to microrotors, their discrete rotational and mirror symm...

The discrete-dipole approximation (DDA) is a powerful method for calculating absorption and scattering by targets that have sizes smaller than or comparable to the wavelength of the incident radiation. The DDA can be extended to targets that are singlyor doubly-periodic. We generalize the scattering amplitude matrix and the 4×4 Mueller matrix to describe scattering by singlyand doubly-periodic ...

Very recently the most general ensemble of qubits are identified using the notion of linearity; any of these qubits gets accepted by a Hadamard gate to generate the equal superposition of the qubit and its orthogonal. Towards more generalization, we investigate the possibility and impossibility results related to Discrete Fourier Transform (DFT) type of operations for a more general set up of q...

A patient who had had successful operation for a common atrium subsequently developed subaortic stenosis and regurgitation several years later. The diagnosis of subaortic lesion was confirmed by echocardiography. This case shows that the left ventricular outflow tract gradient should be measured before operation for common atrium and that after operation such cases should be examined by cross s...

A patient who had had successful operation for a common atrium subsequently developed subaortic stenosis and regurgitation several years later. The diagnosis of subaortic lesion was confirmed by echocardiography. This case shows that the left ventricular outflow tract gradient should be measured before operation for common atrium and that after operation such cases should be examined by cross s...

Three patients with severe congenital aortic stenosis in whom there was unusual thickening of the aortic valve associated with supra-aortic stenosis and aortic hypoplasia are described. The clinical presentation suggested the diagnosis of organic subaortic stenosis and surgical management presented problems. It is suggested that the aortic stenosis in these patients may be part of a more diffus...

Interstellar extinction curve E(λ-V)/E(B-V) vs 1/λ is evaluated in the spectral range 3.4 μm and 0.1 μm using the extinction efficiencies of the porous silicate and graphite grains. The extinction efficiencies of the porous silicate and graphite grains are computed using the discrete dipole approximation (DDA). The model curves are compared with the average observed interstellar extinction curv...