Micromilling process is used for fabrication and manufacturing of miniaturized components. Very high spindle rotational speeds are required in micromilling to reduce the chip load and to counter the low flexural rigidity of the micro-tool while machining hard materials. Apart from the high rotational speed (>100,000 rpm) which can excite dynamic instability, the dynamic force variation in micro...

In a turning process modeled using delay differential equations (DDEs), we investigate the stability of the regenerative machine tool chatter problem. An approach using the matrix Lambert W function for the analytical solution to systems of delay differential equations is applied to this problem and compared with the result obtained using a bifurcation analysis. The Lambert W function, known to...

Living systems are capable of processing multiple sources of information simultaneously. This is true even at the cellular level, where not only coexisting signals stimulate the cell, but also the presence of fluctuating conditions is significant. When information is received by a cell signaling network via one specific input, the existence of other stimuli can provide a background activity -or...

In recent decades, chatter has been a complex phenomenon facing machining industries. Although several toolholder manufacturers attempting to enhance the potential of chatter-free boring process, numerous obstacles and downsides are challenging their efficiency. This study aimed discover sources unpredictable behavior anti-vibration toolholders with focus on SECO Tools’ Steadyline bars. We used...

Social media have been proposed as a data source for influenza surveillance because they have the potential to offer real-time access to millions of short, geographically localized messages containing information regarding personal well-being. However, accuracy of social media surveillance systems declines with media attention because media attention increases "chatter" - messages that are abou...

The prediction of chatter vibrations between the cutter and workpiece is important as a guidance to the machine tool user for an optimal selection of depth of cut and spindle rotation, resulting in maximum chip removal rate without this undesirable vibration. This can be done by some approaches. In this work, an analytical method is applied in which the time-varying directional dynamic milling ...

The vocal repertoire of male Common Yellowthroats (Geothlypis trichas) includes a single distinctive perch song, a flight song, and several calls, including a chatter call. To ascertain the function of perch songs and chatter calls and to determine if these vocalizations are altered to convey different information, I examined the singing and calling behavior of male yellowthroats throughout the...

Do spikes in Twitter chatter about a firm precede unusual stock market trading activity for that firm? If so, Twitter activity may provide useful information about impending financial market activity in real-time. We study the real-time relationship between chatter on Twitter and the stock trading volume of 96 firms listed on the Nasdaq 100, during 193 days of trading in the period from May 21,...

Internet of things applications (IoT) are required to interact with the user in the best natural possible way; the voice based conversation is the ultimate human-machine interaction in terms of easy to use and requirements from the user part, which also has the advantage for the user to interact hands free, non necessary watching a computer screen. Chatter bots are conversational agents that si...