OBJECTIVE The lag of accommodation which occurs in most human subjects during reading has been proposed to explain the association between reading and myopia. However, the measured lags are variable among different published studies and current knowledge on its magnitude rests largely on measurements with the Canon R-1 autorefractor. Therefore, we have measured it with another technique, eccent...

We found diffuse hard X-ray sources, G11.0+0.0, G25.5+0.0, and G26.6−0.1 in the ASCA Galactic plane survey data. The X-ray spectra are featureless with no emission line, and are fitted with both models of a thin thermal plasma in non-equilibrium ionization and a power-law function. The source distances are estimated to be 1–8 kpc, using the best-fit NH values on the assumption that the mean den...

background: in myocardial perfusion spect imaging, images are degraded by photon attenuation, the distance-dependent collimator, detector response and photons scatter. filters greatly affect quality of nuclear medicine images materials and methods: a phantom simulating heart left ventricle was built. about 1mci of 99mtc was injected into the phantom. images were taken from this phantom. some fi...

Traffic noise in urban areas has always been a global issue. This study focuses on the land use analysis of traffic levels Jos Metropolis. The was conducted Metropolis, Plateau State, Nigeria. Twenty-five (25) road corridors were sampled for study. Measurement points randomly selected along corridors. collected using Sound Level Meter. sound level meter positioned at distance 6.5 m from centrel...

When viewing reverspective stimuli, data-driven signals such as disparity, motion parallax, etc, help to recover veridical three-dimensional (3-D) shape. They compete against schema-driven influences such as experience with perspective, foreshortening, and other pictorial cues that favor the perception of an illusory depth inversion. We used three scaled-size versions of a reverspective to stud...

Propose a neural-network based size and color invariant character recognition system using feed-forward neural network. Our feed-forward network has two layers. One is input layer and another is output layer. The whole recognition process is divided into four basic steps such as pre-processing, normalization, network establishment and recognition. Pre-processing involves digitization, noise rem...

MOTIVATION In microarray gene expression studies, the number of replicated microarrays is usually small because of cost and sample availability, resulting in unreliable variance estimation and thus unreliable statistical hypothesis tests. The unreliable variance estimation is further complicated by the fact that the technology-specific variance is intrinsically intensity-dependent. RESULTS Th...

Several shrapnels have been detected in the vicinity of Vela SNR by the ROSAT all-sky survey. We present here the spectral properties of shrapnel ‘A’ observed with the ASCA satellite. A prominent Si-K emission line with relatively weak emission lines from other elements have been detected, revealing that the relative abundance of Si is a few ten-times higher than those of other elements. Combin...

Using the definitive reductions of the IUE light curves by [14] and an extensive set of HST images of SN 1987A we have repeated and improved our original analysis [8] to derive a better determination of the distance to the supernova. In this way we have obtained an absolute size of the ring Rabs = (6.23 ± 0.08) × 10 17 cm and an angular size R′′ = 808 ± 17mas, which give a distance to the super...