eSagan 🇮🇳 @crackurbones@qoto.org
Joined Nov 2019
Turbulent systems are chaotic by nature. But mathematicians just proved that they actually conform to a simple universal law. https://t.co/sZNPfRhB4a
https://twitter.com/QuantaMagazine/status/1224726838427226116?s=09
@freemo Yeah, not in practice.
In the article, when they have used "due to their low energy", they are referring only to the photodetectors which are able to detect higher frequencies.
They just did not went into explaining the lower-energy waves' detection as the context here -- graphene-based detector, which also responds to energy -- makes the principles of dipole antennas irrelevant.
@freemo Well, to detect the lower-energy frequencies (radio waves, microwaves), we use dipole antennas. To detect optical frequencies, we use optical detectors like photodiodes; these devices respond to, and thus detect, frequencies only above a certain threshold frequency. That's the reason why we aren't able to detect lower frequencies (or lower-energy waves) with photodetectors.
The reason why we are not able to use metallic dipole antennae to detect optical frequencies is because antennae need to have dimension of the order of \lambda/2, and with optical frequencies that is a few nanometers.
I found this paper on Optical Yagi-Uda nanoantennas after a little research on internet: https://arxiv.org/pdf/1204.0330v1.pdf
This creates the "Tetrahertz Gap", a range of frequencies which cannot be detected either by photodetectors ("due to their low energy") or by dipole antennas (because making nano-scale antennas is not feasible).
Terahertz waves (THz) sit between microwaves and infrared in the light frequency spectrum, but due to their low-energy scientists have been unable to harness their potential.
The conundrum is known in scientific circles as the terahertz gap.
Being able to detect and amplify THz waves (T-rays) would open up a new era of medical, communications, satellite, cosmological and other technologies.
One of the biggest applications would be as a safe, non-destructive alternative to X-rays.
https://phys.org/news/2020-02-graphene-amplifier-hidden-frequencies-electromagnetic.amp
Graphene amplifier unlocks hidden frequencies in the electromagnetic spectrum
https://phys.org/news/2020-02-graphene-amplifier-hidden-frequencies-electromagnetic.html
The last place you think you will find a special math equation – rat whiskers
https://theprint.in/science/the-last-place-you-think-you-will-find-a-special-math-equation-rat-whiskers/357623/
Balloon-lofted camera built to hunt alien worlds aces first flight | Space
https://www.space.com/hunting-alien-alien-solar-systems-balloon-picture-c-camera.html
Want babies to be healthy? Let them be in charge of what they eat
https://theprint.in/health/want-babies-to-be-healthy-let-them-be-in-charge-of-what-they-eat/354054/?amp
The smell of roses while learning and during sleep helps increase memory and learning skills. The study reports a significant increase in learning success by 30% if a person is exposed to the smell of roses during both learning and sleep phases. - science
https://www.reddit.com/r/science/comments/ex7u8u/the_smell_of_roses_while_learning_and_during/
A research team including 245 undergraduates has published an encyclopedia of more than 1,000 genes, including 421 genes whose functions were previously unknown. The research, conducted in fruit flies, should be useful to scientists studying genes involved in sleep, vision, memory, and others. - science
https://www.reddit.com/r/science/comments/exfugl/a_research_team_including_245_undergraduates_has/
Discarded cigarette butts continue to emit nicotine and other toxic substances into air for several days after a cigarette has been extinguished, new study shows. The findings indicate that non-smokers could be exposed to higher levels of nicotine than currently estimated. - science
https://www.reddit.com/r/science/comments/exa851/discarded_cigarette_butts_continue_to_emit/
Sociable people have a higher abundance of certain types of gut bacteria and also more diverse bacteria. Research found that both gut microbiome composition and diversity were related to differences in personality, including sociability and neuroticism. - science
https://www.reddit.com/r/science/comments/exme9c/sociable_people_have_a_higher_abundance_of/?utm_medium=android_app&utm_source=share
The First African American Woman To Obtain A Graduate Degree In Physics Was Involved In A Top Secret US Mission
https://www.forbes.com/sites/annapowers/2020/01/31/the-first-african-american-woman-to-obtain-a-graduate-degree-in-physics-was-involved-in-a-top-secret-us-mission/
Designed by a computer algorithm and surgically shaped by human hands, these skin-heart hybrids, each roughly the size of a grain of sand, don’t resemble anything found in nature. https://t.co/qfZaLldnCB
https://twitter.com/SmithsonianMag/status/1223833448508542976?s=09
मिरियम मेनकिनः महिला वैज्ञानिक जिनकी पहली कामयाबी थी IVF तकनीक - BBC News हिंदी
https://www.bbc.com/hindi/vert-fut-51255288
फ़िनलैंड हवा से प्रोटीन कैसे बना रहा? - BBC News हिंदी
https://www.bbc.com/hindi/science-51048786
फ़िनलैंड के वैज्ञानिक हवा से प्रोटीन बना रहे हैं. उनका दावा है कि इस दशक में ये सोयाबीन के दामों को टक्कर देगा.
The choice of font affects how people respond to written text, and new studies show how some typefaces elicit emotional responses in election campaigns or poetry.
https://t.co/WhVvY8wfgD https://t.co/N0QnEHJfzB
https://twitter.com/ForbesScience/status/1223625808276787202?s=09
The mysterious microbes shifting humanity's place in the tree of life https://t.co/eEX4ORyFNo https://t.co/P2P6MzjQyM
https://twitter.com/newscientist/status/1223626242668290048?s=09
The Antarctic blackfin icefish is the only vertebrate that doesn’t rely on hemoglobin, but that’s the norm among other animal groups. Here are some insights into why that’s so.
https://t.co/Or7CPU2ev2
https://twitter.com/QuantaMagazine/status/1223626312692240384?s=09
News & Views: Healthy cells in smokers’ lungs have a high burden of mutations, similar to the mutational profile of lung cancer. Ex-smokers’ lungs have a large fraction of healthy cells with nearly normal profiles. https://t.co/u9zBJc04R3
Joined Nov 2019
