Kinds Of Contours Research Articles

What kinds of contours limit filling-in of color?

What kinds of contours limit filling-in of color?

Recorriendo trazos. Un aporte a la definición del estilo decorativo Belén

The main purpose of this paper is to contribute to the definition of organizational resources and iconographic units presented in Belen s style through the analysis of a ceramic vessels sample coming from funerary contexts of three of its dispersion areas, the Abaucan, Hualfin and Andalgala valleys (Catamarca, Argentina). It defines the categories and methodological criteria used in the recognition of morphological and decorative regularities on the ceramic pots independently of its valley of provenience. However, in a greater degree of resolution, there are some particularities related to the thematic repertoire and the kind of contour that distinguishes one zone from the other. Finally, it intends to contribute to the construction of a stylistic base of reference which allows us to classify and incorporate fragmentary materials to the analysis based on the morpho-dimensional, thematic and organizational repertoire founded on complete vessels utilized.

Ventricular aneurysms and ventricular arrhythmias complicating Coxsackie virus B1 myocarditis of Syrian golden hamsters.

We inoculated Coxsackie virus B1 (CVB1) intraperitoneally into 36 2-week-old Syrian golden hamsters. Serial ECGs were recorded from 10 hamsters which survived the acute and electrocardiographically manifest myocarditis. In a mean 17.8 week (range 9 to 31 weeks) follow-up period, chronic ventricular premature contractions (VPC) followed the acute ECG changes in three of the animals. VPC were recorded in a uniform contour in a hamsters, which had a ventricular aneurysm and were of two kinds of contour in the other two hamsters, each of which had two ventricular aneurysms. No VPC was recorded from the other seven hamsters, which had no aneurysms in the heart. None of the inoculated animals died during the follow-up period, irrespective of the existence of ventricular aneurysm, after surviving the first 2 weeks post-infection. The results demonstrate a close relationship between chronic VPC of uniform contours following CVB1 myocarditis and the formation of ventricular aneurysms in Syrian golden hamsters. The hamsters were able to live for a considerably long period with the aneurysms. Ventricular aneurysms following CVB1 myocarditis in Syrian golden hamsters may be an experimental model of human ventricular aneurysms of unknown etiology.

Structural, Optical, and Chemical Relations in Upper Freeport Coal of West-Central Pennsylvania: ABSTRACT

A direct relation in trends has been made between the structural deformation of west-central Pennsylvania and two petrographic properties of the Upper Freeport coal. Using samples collected by the U.S. Geological Survey, data for vitrinite reflectance and fixed-carbon percentage were generated and contour maps developed. It was found that the values increased in a near-linear northwest to southeast trend--the same trend as that of increasing regional deformation. Further development and refinement of these kinds of contour maps give the means for coal companies to infer the probable rank of a particular coal in areas where there has not necessarily been extensive analysis. The results and conclusions in this paper point to a possible method of predicting certain optical a d chemical parameters of coals on the basis of their structural history and scattered samples collected in the basin. End_of_Article - Last_Page 1014------------

Masking produced by sinusoids of slowly changing frequency.

A fixed amplitude sinusoid that was frequency modulated by a sawtooth or triangle wave was used to mask a 20-msec pure-tone signal. The linear portions of the modulating waveforms were 150 msec in duration and swept the masker frequency between 1.5 and 0.75 kHz. A frequency contour of the masking was obtained when the temporal position of the signal was fixed relative to the sawtooth or triangle and the signal frequency was varied. A temporal contour of the masking was measured when the signal frequency was fixed and the temporal position of the signal was varied. Temporal and frequency selectivity indicated by differences of 30–40 dB of masking were observed in both kinds of contours. A linear model consisting of a bandpass filter followed by a power integrator provided a fair approximation to principal features of the masking contours when the bandwidth of the filter was 100–200 Hz and the time constant of the integrator was 10 msec. Similar resonant systems are found in spectrum channel vocoders and in instruments that produce speech spectrograms. The model tends to underestimate the masking at the higher frequencies and does not exhibit the type of deep, narrow-band notches that are found in frequency contours of the masking.

Systematic Classification of Phase Contours and Zeros

A systematic classification of phases contours and zeros is introduced and their effect on asymptotic behavior investigated. A constraint is found on the spacing of closed contours if they are not to contribute to asymptotic behavior. Use is made of a theorem due to P\'olya and Szeg\"o about entire functions with real negative zeros. The concept of topological equivalence of phase contour maps is discussed. The theorem due to P\'olya and Szeg\"o is applied to the fixed-angle scattering amplitude with the assumption that certain kinds of contours or zeros dominate this leads to a constraint on the order of the entire function by which the amplitude may be approximated.