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Optical Frequency Comb
Compact Chips Advance Precision Timing for Communications, Navigation and Other Applications
Shrinking Technology, Expanding Horizons: Complete Article
National Institute of Standards and Technology, Boulder, CO, USA
Igor Kudelin, et. al
Department of Physics, University of Colorado Boulder, Boulder, CO, USA
Abstract: Numerous modern technologies are reliant on the low-phase noise and exquisite timing stability of microwave signals. Substantial progress has been made in the field of microwave photonics, whereby low-noise microwave signals are generated by the down-conversion of ultrastable optical references using a frequency comb1,2,3. Such systems, however, are constructed with bulk or fibre optics and are difficult to further reduce in size and power consumption. In this work we address this challenge by leveraging advances in integrated photonics to demonstrate low-noise microwave generation via two-point optical frequency division4,5. Narrow-linewidth self-injection-locked integrated lasers6,7 are stabilized to a miniature Fabry–Pérot cavity8, and the frequency gap between the lasers is divided with an efficient dark soliton frequency comb9. The stabilized output of the microcomb is photodetected to produce a microwave signal at 20 GHz with phase noise of −96 dBc Hz−1 at 100 Hz offset frequency that decreases to −135 dBc Hz−1 at 10 kHz offset—values that are unprecedented for an integrated photonic system. All photonic components can be heterogeneously integrated on a single chip, providing a significant advance for the application of photonics to high-precision navigation, communication and timing systems.
Mint Julep University
Spoon University
Kentucky Derby Museum | Churchill Downs, Louisville Kentucky
Ingredients:
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- Fresh mint leaves
- Granulated sugar
- Crushed ice
- Kentucky bourbon whiskey
- Mint sprigs for garnish
Instructions:
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- Begin by placing about 6-8 fresh mint leaves and a teaspoon of granulated sugar into a sturdy glass or silver julep cup.
- Use a muddler or the back of a spoon to gently muddle the mint leaves with the sugar. This will release the mint’s essential oils and flavor.
- Fill the glass or cup halfway with crushed ice.
- Pour 2 ½ ounces of Kentucky bourbon whiskey over the ice.
- Stir gently to combine the ingredients and chill the mixture.
- Top off the glass with more crushed ice, filling it to the brim.
- Garnish your mint julep with a fresh mint sprig for aroma and presentation.
- Insert a straw and serve immediately.
University of Louisville: Bourbon Research
University of Kentucky: Daviess County Bourbon
The 2024 Kentucky Derby will be run on Saturday, May 4, 2024. Live TV coverage begins at 2:30 p.m. ET (11:30 a.m. PT). Post time for the 150th running of the Kentucky Derby is 6:57 p.m. ET (3:45 p.m. PT)
Readings:
Spoon University: How to Make a Mint Julep Worthy of the Kentucky Derby
Campus coffee shop offers discounts to students wearing derby attire
Jittery Joe’s Kentucky Derby Race Day Coffee
Disaster 500
Thinking about how that groundhog lied to us 🤨🤨🤨 pic.twitter.com/ZQOzzteCzs
— Penny Kmitt (@pennylikeacoin) April 4, 2024
During today’s session we approach disaster avoidance, management and recovery literature from a different point of view than our customary approach — i.e. what happens when, a) there is failure to conform to the standard, b) there is no applicable standard at all. This approach necessarily requires venturing into the regulatory and legal domains. We will confine our approach to the following standards development regimes:
- De facto standards: These are standards that are not officially recognized or endorsed by any formal organization or government entity, but have become widely adopted by industry or through market forces. Examples include the QWERTY keyboard layout and the MP3 audio format.
- De jure standards: These are standards that are formally recognized and endorsed by a government or standard-setting organization. Examples include the ISO 9000 quality management standard and the IEEE 802.11 wireless networking standard.
- Consortium standards: These are standards that are developed and maintained by a group of industry stakeholders or organizations, often with the goal of advancing a particular technology or product. Examples include the USB and Bluetooth standards, which are maintained by the USB Implementers Forum and the Bluetooth Special Interest Group, respectively.
- Open standards: These are standards that are freely available and can be used, implemented, and modified by anyone without restriction. Examples include the HTML web markup language and the Linux operating system.
- Proprietary standards: These are standards that are owned and controlled by a single organization, and may require payment of licensing fees or other restrictions for use or implementation. Examples include the Microsoft Office document format and the Adobe PDF document format.
- ANSI accredited standards developers with disaster management catalogs
We may have time to review State of Emergency laws on the books of most government agencies; with special attention to power blackout disasters.
- Tornadoes Are Deadly: These New Building Codes Will Save Lives
- Cases involving the Takings Clause of the Fifth Amendment might be relevant when government actions related to natural disasters affect private property rights.
- National Regulatory Research Institute: Should Public Utilities Compensate Customers for Service Interruptions?
Use the login credentials at the upper right of our home page.
https://t.co/chd9RJVc7G
print(“Disaster”) pic.twitter.com/Lu6Dw3bARq— Standards Michigan (@StandardsMich) November 15, 2021
United States Standards Strategy
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Gallery: Dance
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Style Men
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Spring Week 17 | April 21 – April 27
“The Dry Salvages” | No. 3 of the ‘Four Quartets’ by T.S. Eliot, 1946
I do not know much about gods; but I think that the river
Is a strong brown god—sullen, untamed and intractable,
Patient to some degree, at first recognised as a frontier;
Useful, untrustworthy, as a conveyor of commerce;
Then only a problem confronting the builder of bridges.
The problem once solved, the brown god is almost forgotten
By the dwellers in cities—ever, however, implacable.
Keeping his seasons and rages, destroyer, reminder
Of what men choose to forget. Unhonoured, unpropitiated
By worshippers of the machine, but waiting, watching and waiting.
His rhythm was present in the nursery bedroom,
In the rank ailanthus of the April dooryard,
In the smell of grapes on the autumn table,
And the evening circle in the winter gaslight….
Mississippi State University: National Poetry Month 2023
Monday | 21 April | Colloquium 15:00 UTC
Tuesday | 22 April | Colloquium 15:00 UTC
Wednesday | 23 April | Colloquium 15:00 UTC
Thursday | 24 April | Colloquium 15:00 UTC
Friday | 25 April | Colloquium 15:00 UTC
Saturday | 26 April
Sunday | 27 April
CSA Z614-2020: Children’s Playground Equipment
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New update alert! The 2022 update to the Trademark Assignment Dataset is now available online. Find 1.29 million trademark assignments, involving 2.28 million unique trademark properties issued by the USPTO between March 1952 and January 2023: https://t.co/njrDAbSpwB pic.twitter.com/GkAXrHoQ9T
— USPTO (@uspto) July 13, 2023
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