Posts for: AuntiE
May 11, 2024 13:51:21 #
(Main)
ACP45 wrote:
When you say, "rapid pace of the evolution of... (show quote)
Find a concierge médical practice.
May 11, 2024 13:46:21 #
(Main)
AuH20 wrote:
b The Deep State Exposed Itself /b br By: J. B. ... (show quote)
Again Shruck is over the target.
May 11, 2024 13:43:24 #
(Main)
Smedley_buzk**l wrote:
Liberal Democrat Leg Humpers just cannot seem to realize that the pendulum swings both ways and that once Republicans are back in power the Libs will have another bite-in-the-butt moment of realization.
I am leaning toward Democrat Schmucks as a more accurate description.
May 11, 2024 13:40:10 #
Unprecedented Sound Waves – New Metamaterial Redefines Wave Amplification
By AMOLF MAY 7, 2024
https://scitechdaily.com/unprecedented-sound-waves-new-metamaterial-redefines-wave-amplification/
Artist impression of the bosonic Kitaev chain: multiple mechanical string resonators are linked to form a chain using light. Mechanical vibrations (sound waves) are t***sported and amplified along the chain. Credit: Ella Maru Studio
Researchers at AMOLF, working alongside colleagues from Germany, Switzerland, and Austria, have realized a new type of metamaterial through which sound waves flow in an unprecedented fashion. It provides a novel form of amplification of mechanical vibrations, which has the potential to improve sensor technology and information processing devices.
This metamaterial is the first instance of a so-called ‘bosonic Kitaev chain’, which gets its special properties from its nature as a topological material. It was realized by making nanomechanical resonators interact with laser light through radiation pressure forces. The discovery, which is published on March 27 in the renowned scientific journal Nature, was achieved in an international collaboration between AMOLF, the Max Planck Institute for the Science of Light, the University of Basel, ETH Zurich, and the University of Vienna.
The ‘Kitaev chain’ is a theoretical model that describes the physics of electrons in a superconducting material, specifically a nanowire. The model is famous for predicting the existence of special excitations at the ends of such a nanowire: Majorana zero modes. These have gained intense interest because of their possible use in quantum computers.
AMOLF group leader Ewold Verhagen: “We were interested in a model that looks mathematically identical, but describes waves like light or sound, instead of electrons. Since such waves consist of bosons (photons or phonons) rather than fermions (electrons), their behavior is expected to be very different. Nonetheless, in 2018 it was predicted that a bosonic Kitaev chain exhibits fascinating behavior that is not known of any natural material, nor of any metamaterial to date. While many scientists were interested, experimental realization remained elusive.”
Optical Springs
The bosonic Kitaev chain is essentially a chain of coupled resonators. It is a metamaterial, i.e., a synthetic material with engineered properties: the resonators can be thought of as the ‘atoms’ of a material, and the way they are coupled together controls the collective metamaterial behavior; in this case the propagation of sound waves along the chain.
“The c**plings – the links of the bosonic Kitaev chain – need to be special, and can’t be made with regular springs, for example,” says first author of the Nature paper Jesse Slim, who graduated cum laude last year. “We realized that we could experimentally create the required links between nanomechanical resonators – small vibrating silicon strings on a chip – by c**pling them with the help of forces exerted by light; thus creating ‘optical’ springs. Carefully varying the intensity of a laser over time then allowed linking five resonators and implementing the bosonic Kitaev chain.”
Exponential Amplification
The result was striking.
“The optical c**pling mathematically resembles the superconducting links in the fermionic Kitaev chain,” says Verhagen. “But uncharged bosons do not exhibit superconductivity; instead, optical c**pling adds amplification to the nanomechanical vibrations. As a result, sound waves, which are the mechanical vibrations propagating through the array, are exponentially amplified from one end to the other. Interestingly, in the opposite direction t***smission of vibrations is forbidden. And even more intriguing, if the wave is delayed a bit – by a quarter of an oscillation period – the behavior is completely inverted: the signal is amplified backward and blocked forwards. The bosonic Kitaev chain thus acts like a unique type of directional amplifier, which could have interesting applications for signal manipulation, in particular in quantum technology.”
Topological Metamaterial
The interesting properties of Majorana zero modes in the electronic Kitaev chain are linked to the fact that the material is topological. In topological materials, certain phenomena are invariably connected to the general mathematical description of the material. Those phenomena are then topologically protected, meaning that they are guaranteed to exist, even if the material suffers from defects and perturbations.
The understanding of topological materials was awarded the Nobel Prize of physics in 2016, but this encompassed only materials that do not feature amplification or damping. The description of topological phases that do include amplification is still a topic of intense research and debate. Together with theory collaborators Clara Wanjura (Max Planck Institute for the Science of Light), Matteo Brunelli (University of Basel), Javier del Pino (ETH Zurich), and Andreas Nunnenkamp (University of Vienna), the AMOLF researchers showed that the bosonic Kitaev chain is in fact a new topological phase of matter.
The observed directional amplification is a topological phenomenon associated with this phase of matter, as the theory collaborators predicted in 2018. They demonstrated a unique experimental signature of the topological nature of the metamaterial: if the chain is closed, such that it forms a ‘necklace’, amplified sound waves in the ring of resonators keep circulating and reach a very high intensity, similar to how strong light beams are generated in lasers.
Boosting Sensor Performance?
Verhagen: “Because of topological protection, the amplification is in principle insensitive to disturbances. But interestingly, the chain is in fact extra sensitive to one particular type of disturbance; if the frequency of the last resonator on the chain is slightly perturbed, the amplified signals along the chain can suddenly travel backward again, experiencing amplification a second time. The result is that the system is very sensitive to such a small perturbation, which could be caused by the mass of a molecule adhering to the resonator or a qubit interacting with it.”
With the ERC Consolidator Grant that he recently acquired, Verhagen wants to investigate the possibilities to enhance the sensitivity of nanomechanical sensors in these systems. “We have seen the first indications of the sensing capabilities in our experiments, which is very exciting. We now need to investigate in more detail how these topological sensors work, whether the sensitivity is boosted in the presence of various types of noise sources, and which interesting sensor technologies can benefit from these principles. This is just the beginning of that endeavor.”
By AMOLF MAY 7, 2024
https://scitechdaily.com/unprecedented-sound-waves-new-metamaterial-redefines-wave-amplification/
Artist impression of the bosonic Kitaev chain: multiple mechanical string resonators are linked to form a chain using light. Mechanical vibrations (sound waves) are t***sported and amplified along the chain. Credit: Ella Maru Studio
Researchers at AMOLF, working alongside colleagues from Germany, Switzerland, and Austria, have realized a new type of metamaterial through which sound waves flow in an unprecedented fashion. It provides a novel form of amplification of mechanical vibrations, which has the potential to improve sensor technology and information processing devices.
This metamaterial is the first instance of a so-called ‘bosonic Kitaev chain’, which gets its special properties from its nature as a topological material. It was realized by making nanomechanical resonators interact with laser light through radiation pressure forces. The discovery, which is published on March 27 in the renowned scientific journal Nature, was achieved in an international collaboration between AMOLF, the Max Planck Institute for the Science of Light, the University of Basel, ETH Zurich, and the University of Vienna.
The ‘Kitaev chain’ is a theoretical model that describes the physics of electrons in a superconducting material, specifically a nanowire. The model is famous for predicting the existence of special excitations at the ends of such a nanowire: Majorana zero modes. These have gained intense interest because of their possible use in quantum computers.
AMOLF group leader Ewold Verhagen: “We were interested in a model that looks mathematically identical, but describes waves like light or sound, instead of electrons. Since such waves consist of bosons (photons or phonons) rather than fermions (electrons), their behavior is expected to be very different. Nonetheless, in 2018 it was predicted that a bosonic Kitaev chain exhibits fascinating behavior that is not known of any natural material, nor of any metamaterial to date. While many scientists were interested, experimental realization remained elusive.”
Optical Springs
The bosonic Kitaev chain is essentially a chain of coupled resonators. It is a metamaterial, i.e., a synthetic material with engineered properties: the resonators can be thought of as the ‘atoms’ of a material, and the way they are coupled together controls the collective metamaterial behavior; in this case the propagation of sound waves along the chain.
“The c**plings – the links of the bosonic Kitaev chain – need to be special, and can’t be made with regular springs, for example,” says first author of the Nature paper Jesse Slim, who graduated cum laude last year. “We realized that we could experimentally create the required links between nanomechanical resonators – small vibrating silicon strings on a chip – by c**pling them with the help of forces exerted by light; thus creating ‘optical’ springs. Carefully varying the intensity of a laser over time then allowed linking five resonators and implementing the bosonic Kitaev chain.”
Exponential Amplification
The result was striking.
“The optical c**pling mathematically resembles the superconducting links in the fermionic Kitaev chain,” says Verhagen. “But uncharged bosons do not exhibit superconductivity; instead, optical c**pling adds amplification to the nanomechanical vibrations. As a result, sound waves, which are the mechanical vibrations propagating through the array, are exponentially amplified from one end to the other. Interestingly, in the opposite direction t***smission of vibrations is forbidden. And even more intriguing, if the wave is delayed a bit – by a quarter of an oscillation period – the behavior is completely inverted: the signal is amplified backward and blocked forwards. The bosonic Kitaev chain thus acts like a unique type of directional amplifier, which could have interesting applications for signal manipulation, in particular in quantum technology.”
Topological Metamaterial
The interesting properties of Majorana zero modes in the electronic Kitaev chain are linked to the fact that the material is topological. In topological materials, certain phenomena are invariably connected to the general mathematical description of the material. Those phenomena are then topologically protected, meaning that they are guaranteed to exist, even if the material suffers from defects and perturbations.
The understanding of topological materials was awarded the Nobel Prize of physics in 2016, but this encompassed only materials that do not feature amplification or damping. The description of topological phases that do include amplification is still a topic of intense research and debate. Together with theory collaborators Clara Wanjura (Max Planck Institute for the Science of Light), Matteo Brunelli (University of Basel), Javier del Pino (ETH Zurich), and Andreas Nunnenkamp (University of Vienna), the AMOLF researchers showed that the bosonic Kitaev chain is in fact a new topological phase of matter.
The observed directional amplification is a topological phenomenon associated with this phase of matter, as the theory collaborators predicted in 2018. They demonstrated a unique experimental signature of the topological nature of the metamaterial: if the chain is closed, such that it forms a ‘necklace’, amplified sound waves in the ring of resonators keep circulating and reach a very high intensity, similar to how strong light beams are generated in lasers.
Boosting Sensor Performance?
Verhagen: “Because of topological protection, the amplification is in principle insensitive to disturbances. But interestingly, the chain is in fact extra sensitive to one particular type of disturbance; if the frequency of the last resonator on the chain is slightly perturbed, the amplified signals along the chain can suddenly travel backward again, experiencing amplification a second time. The result is that the system is very sensitive to such a small perturbation, which could be caused by the mass of a molecule adhering to the resonator or a qubit interacting with it.”
With the ERC Consolidator Grant that he recently acquired, Verhagen wants to investigate the possibilities to enhance the sensitivity of nanomechanical sensors in these systems. “We have seen the first indications of the sensing capabilities in our experiments, which is very exciting. We now need to investigate in more detail how these topological sensors work, whether the sensitivity is boosted in the presence of various types of noise sources, and which interesting sensor technologies can benefit from these principles. This is just the beginning of that endeavor.”
May 10, 2024 22:55:49 #
(Main)
https://www.potomaclocal.com/2024/05/10/exclusive-drivers-attempt-at-breaching-quantico-gate-echoes-deadly-incidents-at-white-house-u-s-military-bases/
Exclusive: Driver’s Attempt at Breaching Quantico Gate Echoes Deadly Incidents at White House, U.S. Military Bases
Kelly SienkowskiMay 10, 2024 at 4:46pm
Two people inside a box truck tried to force their way onto Quantico Marine Corps Base.
After being pressed by Potomac Local News, base officials today said that in the early morning hours of Friday, May 3, 2024, the two men drove a truck up to the base’s main gate on Fuller Road, just outside Dumfries, told guards that they were contractors for Amazon and were making a delivery to Quantico Town’s post office. The town is located inside the military base.
The men did not provide any approved access credentials, and police determined the vehicle had no affiliation with the base, so officers directed the truck to a holding area for standard vetting procedures. “One of the military police officers noticed the driver, ignoring the direct instructions of the officers, continued to move the vehicle past the holding area and attempted to access…Quantico,” said base spokesman Capt. Micheal Curtis.
Officers then used vehicle denial barriers, or roadblocks that were used to keep out cars, which prevented the two men from traveling further onto the base. The occupants were detained and eventually turned over to ICE, and no one was injured, said Curtis.
Multiple sources report one of the individuals inside the truck is a Jordanian foreign national who recently crossed the southern border into the U.S., and that one of the occupants is on the U.S. terrorist watch list. Quantico did not confirm this information.
Potomac Local News requested more information from ICE, and we’ll update this post as soon as we receive it.
Sources also tell us security on the base has been heightened since the incident, and that a mass email was sent to base personnel urging them to be on high alert.
The Quantico incident mirrors others at military installations across the U.S. and the White House, which have raised concerns about security protocols and the safety of personnel following three separate incidents involving unauthorized vehicle access.
Two days after the incident at Quantico, a vehicle crashed into an outer perimeter gate of the White House in Washington, D.C., resulting in the death of the driver. President Joe Biden, who was away for the weekend in Delaware, was not present during the incident, and the Secret Service confirmed that there was no threat to the White House.
The driver, a male whose identity has not yet been disclosed, was found deceased in the vehicle following the crash, which took place shortly before 10:30 p.m.
The Secret Service promptly enacted security measures, assuring the public that there was no immediate threat to the White House. Both the Secret Service and local law enforcement agencies are actively investigating the incident to determine its cause and any underlying factors.
Tragedy struck at Joint Expeditionary Base Little Creek–Fort Story in Virginia on Sunday, April 28, when a driver attempted to breach security protocols at the installation’s gate and crashed into a hydraulic barricade. Despite attempts by the base’s fire company to extinguish the resulting fire, the driver succumbed to the crash. According to a public affairs officer, the vehicle disregarded security checks and barreled through the gate at high speed.
On April 3, at Naval Base San Diego, an internal security vehicle triggered chaos at the Norman Scott Gate. The unmarked vehicle, belonging to the base’s security team, breached the gate without stopping, prompting the activation of emergency barricades. The ensuing collision injured three occupants, including two civilian officers and one active-duty military member.
On March 27, 2024, at Twentynine Palms, California, a Chinese national made a brazen attempt to gain access to the Marine Corps Air Ground Combat Center. Despite being informed by military police that he lacked authorization, the individual proceeded past gate guards, prompting immediate intervention by law enforcement. The suspect was swiftly detained and t***sferred to Customs and Border Patrol custody.
Thank you so much President Biden for opening our border so foreign nationals can enter and plan damage to our country. Your son Beau would be embarrassed!
Exclusive: Driver’s Attempt at Breaching Quantico Gate Echoes Deadly Incidents at White House, U.S. Military Bases
Kelly SienkowskiMay 10, 2024 at 4:46pm
Two people inside a box truck tried to force their way onto Quantico Marine Corps Base.
After being pressed by Potomac Local News, base officials today said that in the early morning hours of Friday, May 3, 2024, the two men drove a truck up to the base’s main gate on Fuller Road, just outside Dumfries, told guards that they were contractors for Amazon and were making a delivery to Quantico Town’s post office. The town is located inside the military base.
The men did not provide any approved access credentials, and police determined the vehicle had no affiliation with the base, so officers directed the truck to a holding area for standard vetting procedures. “One of the military police officers noticed the driver, ignoring the direct instructions of the officers, continued to move the vehicle past the holding area and attempted to access…Quantico,” said base spokesman Capt. Micheal Curtis.
Officers then used vehicle denial barriers, or roadblocks that were used to keep out cars, which prevented the two men from traveling further onto the base. The occupants were detained and eventually turned over to ICE, and no one was injured, said Curtis.
Multiple sources report one of the individuals inside the truck is a Jordanian foreign national who recently crossed the southern border into the U.S., and that one of the occupants is on the U.S. terrorist watch list. Quantico did not confirm this information.
Potomac Local News requested more information from ICE, and we’ll update this post as soon as we receive it.
Sources also tell us security on the base has been heightened since the incident, and that a mass email was sent to base personnel urging them to be on high alert.
The Quantico incident mirrors others at military installations across the U.S. and the White House, which have raised concerns about security protocols and the safety of personnel following three separate incidents involving unauthorized vehicle access.
Two days after the incident at Quantico, a vehicle crashed into an outer perimeter gate of the White House in Washington, D.C., resulting in the death of the driver. President Joe Biden, who was away for the weekend in Delaware, was not present during the incident, and the Secret Service confirmed that there was no threat to the White House.
The driver, a male whose identity has not yet been disclosed, was found deceased in the vehicle following the crash, which took place shortly before 10:30 p.m.
The Secret Service promptly enacted security measures, assuring the public that there was no immediate threat to the White House. Both the Secret Service and local law enforcement agencies are actively investigating the incident to determine its cause and any underlying factors.
Tragedy struck at Joint Expeditionary Base Little Creek–Fort Story in Virginia on Sunday, April 28, when a driver attempted to breach security protocols at the installation’s gate and crashed into a hydraulic barricade. Despite attempts by the base’s fire company to extinguish the resulting fire, the driver succumbed to the crash. According to a public affairs officer, the vehicle disregarded security checks and barreled through the gate at high speed.
On April 3, at Naval Base San Diego, an internal security vehicle triggered chaos at the Norman Scott Gate. The unmarked vehicle, belonging to the base’s security team, breached the gate without stopping, prompting the activation of emergency barricades. The ensuing collision injured three occupants, including two civilian officers and one active-duty military member.
On March 27, 2024, at Twentynine Palms, California, a Chinese national made a brazen attempt to gain access to the Marine Corps Air Ground Combat Center. Despite being informed by military police that he lacked authorization, the individual proceeded past gate guards, prompting immediate intervention by law enforcement. The suspect was swiftly detained and t***sferred to Customs and Border Patrol custody.
Thank you so much President Biden for opening our border so foreign nationals can enter and plan damage to our country. Your son Beau would be embarrassed!
May 10, 2024 22:45:26 #
May 10, 2024 15:53:12 #
LiberalGrammyD wrote:
Oh Yes We both listen to suggestions from the grandkids and their parents. I have been listening to a lot of current country and Top40 and my personal favorite is contemporary Chrsitian. Hubs who will hit the big 70 in 15days likes music from the 30s to today. He has got me to listen to Big Band as well as 60-70s Rock,Motown, Bluegrass, Celtic and newer modern pop.
I am fond of this in the contemporary Christian genre.
https://www.youtube.com/watch?v=KKo3T0j9qqo
May 10, 2024 15:22:01 #
(Main)
archie bunker wrote:
Is this all you have to be upset about today? b... (show quote)
I find it hilarious. Puts paid to the New York we are not r****t trope.
May 10, 2024 15:21:03 #
(Main)
NotMAGA wrote:
...and it starts in the home. br br "A r****... (show quote)
How is this possible in sanctified New York?
According to a certain cult only southern Bible thumping, gun toting rednecks are r****t.
May 10, 2024 13:55:22 #
Coos Bay Tom wrote:
Here's one a blonde woman goes into a bank in New ... (show quote)
A smart blonde!
May 10, 2024 13:54:47 #
Ted_68 wrote:
Ok…
What dose a blond get when she dyes her hair ?
Artificial intelligence
What dose a blond get when she dyes her hair ?
Artificial intelligence
May 10, 2024 13:53:08 #
May 10, 2024 13:52:07 #
May 10, 2024 13:51:32 #
May 9, 2024 18:09:57 #
Two blondes are strolling through the woods when they come across some tracks.
Blonde #1: Awww how cute, these are deer tracks.
Blonde #2: No, don't be daft, these are moose tracks!
Blonde #1: No, my dad taught me about this, These are definitely deer tracks!
They keep arguing with each other until they eventually get hit by a train.
Blonde #1: Awww how cute, these are deer tracks.
Blonde #2: No, don't be daft, these are moose tracks!
Blonde #1: No, my dad taught me about this, These are definitely deer tracks!
They keep arguing with each other until they eventually get hit by a train.