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Researchers demonstrate room-temperature lasing in photonic-crystal surface-emitting laser

In a first for the field, researchers from The Grainger College of Engineering at the University of Illinois Urbana-Champaign have reported a photopumped lasing from a buried dielectric photonic-crystal surface-emitting laser emitting at room temperature and an eye-safe wavelength. Their findings, published in IEEE Photonics Journal, improve upon current laser design and open new avenues for defense applications.

For decades, the lab of Kent Choquette, professor of electrical and computer engineering, has explored VCSELs, a type of surface-emitting laser used in common technology like smartphones, laser printers, barcode scanners, and even vehicles. But in early 2020, the Choquette lab became interested in groundbreaking research from a Japanese group that introduced a new type of laser called photonic-crystal surface-emitting lasers, or PCSELs.

PCSELs are a newer field of semiconductor lasers that use a photonic crystal layer to produce a with highly desirable characteristics such as high brightness and narrow, round spot sizes. This type of laser is useful for defense applications such as LiDAR, a remote sensing technology used in battlefield mapping, navigation, and target tracking. With funding from the Air Force Research Laboratory, Choquette’s group wanted to examine this new technology and make their own advancements in the growing field.

Figure AI founder Brett Adcock says there will soon be as many humanoid robots as humans

Other major players in the humanoid robot space include Tesla, which has Optimus, a 5-foot-8 humanoid robot that can dance, clean, and take out the trash. The company is working to deploy its first fleet in its factories by the year’s end. Boston Dynamics has Atlas, which can run, crawl, break dance, and do cartwheels. Agility Robotics has Digit, which Amazon once tested in its warehouses, though the e-commerce giant now uses its own set of in-house, non-humanoid robots designed by Amazon Robotics.

Many of these humanoid machines move with fluidity, exhibiting a suite of motor skills that allow them to augment the human labor force. Figure says its mission is to “develop general-purpose humanoids that make a positive impact on humanity and create a better life for future generations,” especially ones that can “eliminate the need for unsafe and undesirable jobs — ultimately allowing us to live happier, more purposeful lives.”

The company already has robots mingling with humans at its offices, asking employees if they want water or coffee, or simply patrolling the premises, he said. So, it’s not hard to imagine a time when “you’ll see as many humanoid robots as you see humans,” he said. “It’s literally going to feel like a sci-fi movie.”

“This AI Outperformed Human Scientists”: Tasked With Reinventing Gravitational Wave Detectors, It Designed 50 Revolutionary Models That Could Change Everything

IN A NUTSHELL 🚀 Researchers have developed an AI program named Urania that designs more effective gravitational wave detectors. 🌌 These new detectors could significantly enhance our ability to observe distant cosmic events, including black hole mergers and early universe phenomena. 🔍 The AI-designed detectors cover a wider frequency range, potentially increasing the universe’s observable

Why and How the Universe Is an Illusion

Some ancient philosophies, such as Advaita Vedanta, claim that the universe is an illusion. Not only spiritual people quote this statement, but also some influential Western thinkers. Albert Einstein said:

“Reality is merely an illusion, albeit a very persistent one.” (Albert Einstein)

In what sense is the universe or reality an illusion? In the following, I bring clarity to this topic.

Replicating Kolmogorov’s Counterexample for Fourier Series in Context of Fourier Transforms

It is a famous result of Kolmogorov that there exists a (Lebesgue) integrable function on the torus such that the partial sums of Fourier series of $f$ diverge almost everywhere (a.e.). More specifically, he exhibited an $f\in L^{1}(\mathbb{T})$ such that.

\begin{align*} \sup_{N\geq 1}\left|S_{N}f(x)ight|=\sup_{N\geq 1}\left|(f\ast D_{N})(x)ight|=\infty, \qquad\forall \text{ a.e. } x\in\mathbb{T}, \end{align*} where $S_{N}$ is the $N^{th}$ partial sum and $D_{N}$ is the $N^{th}$ Dirichlet kernel given below. \begin{align*} S_{N}f(x):=\sum_{\left|night|\leq N}\widehat{f}(n)e^{2\pi inx}, \quad D_{N}(x):=\dfrac{\sin 2\pi(N+\frac{1}{2})x}{\sin \pi x} \end{align*} and we identify $\mathbb{T}$ with the unit interval $[0,1]$.

I have read, for example pg. 118 in [Pinsky], that Kolmogorov’s counterexample can be replicated in the context of the Fourier transform on the real line $\mathbb{R}$, showing that $L^{1}$ pointwise Fourier inversion can fail quite horribly. If my understanding is correct, then the following claim is true:

Neither Silicon Valley nor Harvard — Zuckerberg relies on Chinese scientists to conquer the future of artificial intelligence

Zuckerberg has recruited the top minds in artificial intelligence and put together a superintelligence team to compete in the race! What has drawn the most