We have studied light-induced birefringence (LIB) and surface relief grating (SRG) formation in the series of methylacrylate polymers. The effect of material structure such as length of photochromic side chain, glass transition temperature and molecular structure of azo units on LIB and SRG are studied. The optical formation of self-induced SRG on films of these materials is also presented.

An element of a ring $R$ is called clear if it sum unit-regular and unit. associative each its elements clear.In this paper we defined rings extended many results to wider class. Finally, proved that commutative Bezout domain an elementary divisor only every full $2\times 2$ matrix over nontrivially clear.

We study the expressive power of positive neural networks. The model uses positive connection weights and multiple input neurons. Different behaviors can be expressed by varying the connection weights. We show that in discrete time and in the absence of noise, the class of positive neural networks captures the so-called monotone-regular behaviors, which are based on regular languages. A finer p...

In this paper the asymptotic properties of ARMA processes with complex-conjugate unit roots in the AR lag polynomial are studied. These processes behave quite di¤erently from regular unit root processes (with a single root equal to 1). In particular, the asymptotic properties of a standardized version of the periodogram for such processes are analyzed, and a nonparametric test of the complex un...

Techniques for inferring a regular language, in the form of a finite automaton, from a sufficiently large sample of accepted and nonaccepted input words, have been employed to construct models of software and hardware systems, for use, e.g., in test case generation. We intend to adapt these techniques to construct state machine models of entities of communication protocols. The alphabet of such...

Given an alphabet A, a pattern p is a sequence (v l , . . . ,vm) of words from A* called keywords. We represent p as a single word vl@.. 9 @vm, where @ ~ A is a distinguished symbol called variable length don't care symbol. Pattern p is said to match a text t E A* if t = UoVlUa...um_xv,~u,~ for some u0 , . . . ,u ,~ E A' . In this paper we address the following problem: given a set P of pattern...

SUMMARY Routine intensive care unit monitoring is common after elective embolization of unruptured intracranial aneurysms. In this series of 200 consecutive endovascular procedures for unruptured intracranial aneurysms, 65% of patients were triaged to routine (non-intensive care unit) floor care based on intraoperative findings, aneurysm morphology, and absence of major co-morbidities. Only 1 p...

To assess the rapidly changing psychological status of nurses during the acute phase of the 2003 SARS outbreak, we conducted a prospective and periodic evaluation of psychiatric morbidity and psychological adaptation among nurses in SARS units and non-SARS units. Nurse participants were from two SARS units (regular SARS [N=44] and SARS ICU [N=26]) and two non-SARS units (Neurology [N=15] and CC...

We propose a construction that augments the precomputation step of a regular tree pattern matching algorithm to include cost analysis. The matching device generated is a pushdown automaton in contrast with the conventionally generated tree pattern matching automaton. Our technique can handle a larger class of cost augmented regular tree grammars than can be preprocessed by conventional methods,...

Gynaecomastia is associated with several clinical conditions, but so far as we can ascertain the only report of it occurring in chronic renal failure is that of Shaldon (1966). He mentions gynaecomastia in patients undergoing regular dialysis treatment, and attributes this to the refeeding of malnourished uraemic patients at the start of dialysis. It does not seem to have been observed in uncom...