Image quality in an optical system operating in partially coherent light: effect of parabolic motion

Results of investigations on an optical system performance as affected by parabolic image motion have been presented in graphic form. The analysis has been performed using Schell's theorem, which occurs in the theory of partial coherence, under the assumption of scalar diffraction theory. Diffraction figure broadening along the direction of motion has been plotted for besinc and Gaussian forms of coherence functions across the circular aperture. Results of the present paper in case of besinc correlation have been shown to be identical with the diffraction images of uniform incoherent bright circular disks in the presence of parabolic motion. Hence the analysis of the present paper is also useful for persons engaged in work concerning aerial reconnaissance etc.

An unusual complication of pelvic exenteration

A case of recurrent carcinoma at the site of a urinary conduit stoma after total pelvic exenteration for carcinoma of the cervix is reported. Treatment by radical excision of the abdominal wall encircling the conduit and postoperative radiotherapy was successful. The patient is free of disease 6 years later.

Incoherent bar images formed by a polarizing microscope with crossed polarizers

Diffraction images of incoherent bar objects formed by a polarizing microscope with crossed polarizers are studied. Expression for intensity distribution has been derived and the results in the form of curves have been plotted. The images which are of unusual shape, different from the patterns formed by the ordinary microscope are strongly dependent upon the size of the bar/coherence parameter. The line spread function can be obtained by taking a very narrow bar.

Biochemical and histochemical studies on non-specific phosphomonoesterases of swine kidney worm Stephanurus dentatus (Diesing, 1839)

Biochemical and histochemical studies have been made on non-specific acid and alkaline phosphomonoesterases of S. dentatus. The two forms of acid phosphomonoesterases have been found active at pH 4.0 and 6.0. The pH optima for the two forms of aklaline phosphomonoesterases lie at 8.0 and 10.0. Studies on the distribution of acid and alkaline phosphomonoesterases in various tissues have revealed an abundance of acid phosphomonoesterase in various parts of the alimentary canal and various organs of the reproductive system. The excretory ducts show alkaline phosphomonoesterase activity only.

Periodic nonsinusoidal vibration: effects in matched filtering for detection of signals buried in noise of uniform spectral density

In the present paper, the effects of periodic nonsinusoidal vibrations of spatial filters in signal detection experiments are considered. Performance degradation of such an optical information processing system is shown graphically, assuming that the signal is buried in noise of uniform spectral density. Results are compared with those in the presence of pure sinusoidal vibrations of the spatial filter. It is observed that the performance of the system decreases with the increase in departure from the pure sinusoidal case.

Naphthyridinomycin, a new broad-spectrum antibiotic

A new antibiotic, naphthyridinomycin, was isolated in crystalline form from the culture filtrate of Streptomyces lusitanus AY B-1026. The antibiotic is active against a large number of both gram-positive and gram-negative bacteria, and inactive against Candida albicans, Trichophyton granulosum and Microsporum gypseum. The antibiotic is toxic in mice.

Influence of longitudinal vibrations on the diffraction images of bright incoherent disks

The intensity distribution in the images of uniform bright incoherent disks is obtained in the presence of longitudinal vibrations by using the Fourier Hankel transform method. Results are given in graphical form for disks with various diameter values. It is observed that in certain cases the presence of longitudinal vibrations completely distorts the object. Hence a detailed analysis of image intensity distribution should prove useful to those engaged in interpretation of photographs in aerial reconnaissance work.

Characteristic fringe function for time-average holography of periodic nonsinusoidal vibrations

In this paper the characteristic fringe function of hologram interferometry has been evaluated for the case of periodic, nonsinusoidal vibrations represented by a Jacobian elliptic function. To consider the reconstructed holographic image of an object, use has been made of an equation derived from considerations of the effect of motion on coherence. Graphical representation of the fringe irradiance distribution in the reconstructed image is given. It is shown that, as the motion departs from pure sinusoidal form, the intensity of the fringes increases considerably as compared with that for a pure sinusoidal case.