Existence of traveling wave front solutions is established for diffusive and cooperative Lotka–Volterra system with delays. The result is an extension of an existing result for delayed logistic scaler equation to systems, and is somewhat parallel to the existing result for diffusive and competitive Lotka–Volterra systems without delay. The approach used in this paper is the upper–lower solution...

The aim of this investigation was to determine if cavitation occurred around dental ultrasonic scalers and to estimate the amount of cavitation occurring. Three styles of tip (3 x TFI-10, 3 x TFI-3, 3 x TFI-1) were used, in conjunction with a Cavitron SPS ultrasonic generator (Dentsply, USA), to insonate terephthalic acid solution. The hydroxyl radical, [*OH], concentration, produced due to cav...

PURPOSE Assess prevalence of self-reported hearing difficulties among experienced dental hygienists who have been practicing for a minimum of 20 years and explore the relationship between hearing difficulties and occupational noise exposure from ultrasonic scalers. METHODS A 19-item survey was mailed to a random sample of 1,067 dental hygienists who had obtained their California licenses betw...

This paper describes a more efficient paired comparison method that reduces the number of trials necessary for converting a table of paired comparisons into scaler data. Instead of comparing every pair of samples (the complete method), a partial method is used that makes more comparisons between closer samples than between more distant samples. A sorting algorithm is used to efficiently order t...

The perceived resolution of matrix displays increases when the relative position of the color subpixels is taken into account. ‘Subpixel rendering’ algorithms are being used to convert an input image to subpixel-corrected display images. This paper deals with the consequences of the subpixel structure, and the theoretical background of the resolution gain. We will show that this theory allows a...

There are several known undecidability problems for 3×3 integer matrices the proof of which uses a reduction from the Post Correspondence Problem (PCP). We establish new lower bounds in the numbers of matrices for the mortality, zero in left upper corner, vector reachability, matrix reachability, scaler reachability and freeness problems. Also, we give a short proof for a strengthened result du...

This paper describes a more efficient paired comparison method that reduces the number of trials necessary for converting a table of paired comparisons into scaler data. Instead of comparing every pair of samples (the complete method), a partial method is used that makes more comparisons between closer samples than between more distant samples. A sorting algorithm is used to efficiently order t...

Penelitian ini bertujuan untuk mengetahui tingkat ketelitian pengukuran kayu bulat yang dilakukan oleh juru ukur perusahaan (scaler) pada IUPHHK PT. Manokwari Mandiri Lestari Kabupaten Teluk Bintuni. Metode digunakan dalam penelitian adalah metode deskriptif dengan teknik observasi lapang. Hasil menunjukan bawa terdapat 100 jumlah sampel dari jenis meranti, dimana 15 batang hasilnya mengalami s...