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La Fémis
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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.
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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Investigating the Perceived Impact of Maternity on Software Engineering: a Women’s Perspective
Investigating the Perceived Impact of Maternity on Software Engineering: a Women’s Perspective
Abstract: Background: Several researchers report the impact of gender on software development teams, especially in relation to women. In general, women are under-represented on these teams and face challenges and difficulties in their workplaces. When it comes to women who are mothers, these challenges can be amplified and directly impact these women’s professional lives, both in industry and academia. However, little is known about women ICT practitioners’ perceptions of the challenges of maternity in their professional careers. Objective: This paper investigates mothers’ challenges and difficulties in global software development teams. Method: We conducted a survey with women in the ICT field who work in academia and global technology companies. We surveyed 141 mothers from different countries and employed mixed methods to analyze the data. Results: Our findings reveal that women face sociocultural challenges, including work-life balance issues, bad jokes, and moral harassment. The prejudices they suffer make them insecure and with low confidence in the work performed. Furthermore, they usually do not have a supporting network during and after maternity leave, which culminates in them feeling overloaded. The surveyed women suggested a set of actions to reduce the challenges they face in their workplaces, such as: creating a code of conduct for men and childcare within companies. Conclusion: Women face many challenges when they become mothers. Our findings explore these challenges and can help organizations in developing policies to minimize them. Also, it can help raise awareness of co-workers and bosses, toward a more friendly and inclusive workplace.
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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