The primary goal of the this paper is to summarize field demonstrations of the feasibility of detecting changes in blade and shaft natural frequencies (such as those associated with a blade or shaft crack) on operating machinery using non-contact, nonintrusive measurement methods. This paper primarily addresses the results of application of this nonintrusive torsional vibration sensing to: a la...

We study several modal languages in which some (sets of) generalized quantifiers can be represented; the main language we consider is suitable for defining any first order definable quantifier, but we also consider a sublanguage thereof, as well as a language for dealing with the modal counterparts of some higher order quantifiers. These languages are studied both from a modal logic perspective...

Abstract. In this paper, we propose to study a generalized form of the exponential power distribution which contains others in the literature as special cases. This unifying exponential power distribution is characterized by a parameter ω and a function h(ω) which regulates the tail behavior of the distribution, thus making it more flexible and suitable for modeling than the usual normal di...

Level crossing rate, outage probability and average time of fade duration of the SSC combiner output signal are determined in this paper. Log-normal fading at the input is present. The results are shown graphically for different variance values, decision threshold values and fading parameters values. Key-Words: Diversity reception, Fade Duration, Level Crossing Rate, Log-normal fading, Outage P...

Voltage collapse and blackout can occur in an electric power system when load powers vary so that the system loses stability in a saddle node bifurcation. We propose new iterative and direct methods to compute load powers a t which bifurcation occurs and which are locally closest to the current operating load powers. The distance in load power parameter space to this locally closest bifurcation...

We have studied the group and phase speed structure of long-range acoustic arrivals using linear acoustics. Here we present a preliminary study of some of these same paths but now we consider a higher amplitude source necessitating a nonlinear acoustic treatment. This research involves the eventual coupling of the Nonlinear Progressive Wave Equation (NPE) with an Adiabatic Normal Mode (ANM) Mod...

A low-power, surface-normal optically controlled optical gate that incorporates two stacked AlGaAs diodes has been tested using both picosecond and femtosecond pulses. The device opens and closes within 20 picoseconds with a 30% reflectivity change. Repeated gating with 20 picosecond periods has been demonstrated— a repetition period significantly faster than the external RC time constant. A th...

purpose: comparison of the results of visual evoked potential (vep) in time domain and frequency domain between multiple sclerosis (ms) suspected patients and normal indivisuals. method: eleven ms suspected patients with normal visual findings and 20 normal individuals were tested by vep. results were compared between two groups. results: the time domain results showed no significant difference...

Statistical analysis of non-normal data is usually more complicated than that for normaldistribution. In this paper, a simple root/power transformation technique developed by Niaki, et al [1]is extended to transform right and left skewed distributions to nearly normal. The value of theroot/power is explored such that the skewness of the transformed data becomes almost zero with anacceptable err...