We realize a fiber Bragg grating InGaN-based laser diode emitting at 400 nm and demonstrate its high coherency. Thanks to the fabrication of narrowband in near-UV, we can reach single-mode single-frequency regimes for self-injection locked diode. The device exhibits 44 dB side-mode suppression ratio mW output power. Detailed frequency noise analysis reveals sub-MHz integrated linewidth 16 kHz i...

Performance modelling and veriication are vital steps in the development cycle of any cache coherency protocol. Two separate models are usually required to perform each analysis step and as protocols become increasingly complex each can become correspondingly unwieldy. We examine how stochastic process algebra can be used to describe cache coherency protocols in such a way as to allow both the ...

An important issue in the dissemination of time-varying web data such as sports scores and stock prices is the maintenance of temporal coherency. In the case of servers adhering to the HTTP protocol, clients need to frequently pull the data based on the dynamics of the data and a user’s coherency requirements. In contrast, servers that possess push capability maintain state information pertaini...

The popularity of XML has exacerbated the need for an easy-to-use, high precision query interface for XML data. When traditional document-oriented keyword search techniques do not suffice, natural language interfaces and keyword search techniques that take advantage of XML structure make it very easy for ordinary users to query XML databases. Unfortunately, current approaches to processing thes...

Ladislav Kristoufek Abstract We focus on power-law coherency as an alternative approach towards studying power-law crosscorrelations between simultaneously recorded time series. To be able to study empirical data, we introduce three estimators of the power-law coherency parameter Hρ based on popular techniques usually utilized for studying power-law cross-correlations – detrended cross-correlat...

In this work, an analysis method is developed for the robust and efficient estimation of 3-D seismic local structural entropy, which is a measure of local discontinuity. This method avoids the computation of large covariance matrices and eigenvalues, associated with the eigenstructure-based and semblance-based coherency estimates. We introduce a number of local discontinuity measures, based on ...

Many books on polarization give tables of Mueller matrices. The coherency matrix has been found useful for interpretetion the matrix. Here we a table matrices M, C, and factors F different components systems. is not given some complicated nondeterministic cases. In many cases, though, very simple form. particular, expressions general case an homogeneous elliptic diattenuating retarder. Differen...

In this article, the authors studied the developmental trajectories of three teachers as they integrated GroupScribbles (GS) technology in their classroom lessons over a semester period of about 5 months. Coherency diagrams were used to capture the complex interplay of a teacher’s knowledge (K), goals (G) and beliefs (B) in leveraging technology effectively in the classroom. The degree of coher...