Turn-on-time statistics of modulated lasers subjected to resonant weak optical feedback

We present analytical calculations of the turn-on-time probability distribution of intensity-modulated lasers under resonant weak optical feedback. Under resonant conditions, the external cavity round-trip time is taken to be equal to the modulation period. The probability distribution of the solitary laser results are modified to give reduced values of the mean turn-on-time and its variance. Numerical simulations have been carried out showing good agreement with the analytical results.

Consumer Advisory Bulletin, Beware of A Foreclosure Rescue Scams, February 2012

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Consumer Advisory Bulletin, Don’t Let a Contractor “Put the Fix in” on YOUR Home Repairs & Improvements!, April 2012

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Consumer Advisory Bulletin, A Lesson in For-Profit Colleges, May 2012

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Consumer Advisory Bulletin, Choosing and Buying the Right Pet, June 2012

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Consumer Advisory Bulletin, Work-at-Home Scams: Money for Nothing, July 2012

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Consumer Advisory Bulletin, Work-at-Home Scams:So You Didn’t Order That? Protecting yourself from unauthorized credit card charges, August 2012

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Consumer Advisory Bulletin, Credit Card Offers: They’re Not All the Same, October 2012

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Consumer Advisory Bulletin, Giving Wisely: A Guide to Charitable Giving and Avoiding Charity Fraud, November 2012

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Feedback control of DnaA-mediated replication initiation by replisome-associated HdaA protein in Caulobacter.

Chromosome replication in Caulobacter crescentus is tightly regulated to ensure that initiation occurs at the right time and only once during the cell cycle. The timing of replication initiation is controlled by both CtrA and DnaA. CtrA binds to and silences the origin. Upon the clearance of CtrA from the cell, the DnaA protein accumulates and allows loading of the replisome at the origin. Here, we identify an additional layer of replication initiation control that is mediated by the HdaA protein. In Escherichia coli, the Hda protein inactivates DnaA after replication initiation. We show that the Caulobacter HdaA homologue is necessary to restrict the initiation of DNA replication to only once per cell cycle and that it dynamically colocalizes with the replisome throughout the cell cycle. Moreover, the transcription of hdaA is directly activated by DnaA, providing a robust feedback regulatory mechanism that adjusts the levels of HdaA to inactivate DnaA.

Consumer Advisory Bulletin, Giving Wisely: Tips for Happier Holiday Shopping, December 2012

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Consumer Advisory Bulletin, Reverse Mortgages, January 2013

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Feedback control of unstable cellular solidification fronts

We present a feedback control scheme to stabilize unstable cellular patterns during the directional solidification of a binary alloy. The scheme is based on local heating of cell tips which protrude ahead of the mean position of all tips in the array. The feasibility of this scheme is demonstrated using phase-field simulations and, experimentally, using a real-time image processing algorithm, to track cell tips, coupled with a movable laser spot array device to heat the tips locally. We demonstrate, both numerically and experimentally, that spacings well below the threshold for a period-doubling instability can be stabilized. As predicted by the numerical calculations, cellular arrays become stable with uniform spacing through the feedback control which is maintained with minimal heating.

Consumer Advisory Bulletin, Paper or Plastic? Gift Certificates & Gift Cards, February 2013

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Consumer Advisory: Auto Repairs: Going Under the Hood, April 2013

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