Dust grains swirl around a newly formed star in this animation. Over thousands of years they can accumulate material like ices on their surfaces, which are eventually swept up into planets. Credit: NASA-JPL.
Terahertz (THz)-band communications are currently being celebrated as a key technology that could fulfill the increasing demands for wireless data traffic in the upcoming sixth-generation (6G) of wireless communications. Many challenges, such as high propagation losses and power limitations, which result in short communication distances, have yet to be addressed for this technology to be realized. Ultra-massive multiple-input, multiple-output (UM-MIMO) antenna systems have emerged as practical means for combatting this distance problem, thereby increasing system capacity. Towards that end, graphene-based nano-antennas have recently been proposed, as they can be individually tuned and collectively controlled in compact UM-MIMO array-of-sub-arrays architectures. In this paper, we present a holistic overview of THz UM-MIMO systems. We assess recent advancements in transceiver design and channel modeling, and discuss the major challenges and shortcomings of such designs by deriving the relationship between communication range, array dimensions, and system performance. We further highlight several research advances that could enhance resource allocation at the THz band, including waveform designs, multi-carrier configurations, and spatial modulations. Based on this discussion, we highlight prospective use cases that can bring THz UM-MIMO into reality in the context of sensing, data centers, cell-free systems, and mid-range wireless communications.
It's May. We've moved from the past to the present. Look at us go.
Some of us are going to need another week to come to terms with that fact. Meanwhile, some of you have been waiting, lurking in the shadows, hovering just behind the curtains of April, ready to jump out at May, your mer-art at the ready.
Please enjoy your second day of Mermay. And be sure to hit the merfolk bracket on your way out.
~
@oxytocxins:
@norrriey:
@cathwizard:
@castercassette:
@kashkadavr:
@miimikyupic:
@inogart:
@synthellasart:
@maybeits-nana:
@incandescentsims:
@xylinthia:
@sparklingpixies:
@jack-o-phantom:
@greenfinch-garden:
@pixiethesizeshifter:
@fearthefuzzybear:
@sillypinkponies:
@hellenastranger:
@jiangzongzhu:
@leafbunnysketchbook:
@chrischrisart:
@leona-florianova
@artist-ellen:
...and a bonus moray with legs by @ketrinadrawsalot:
Cosmic cliffs, our beloveds. ICYMI, @nasa recently shared some neat new images from the James Webb telescope. So, of course, you all got to work. Whether it’s plonking your faves on a star-birthing nebula or celebrating the sparkle in its uncolonized state, there’s art for that.
@cassieoh imagines Crowley lazing around Carina in his snake form:
@sir-galahadnt styled the nebula in inspirobot chic using a quote from Hamlet (click through for the full quote):
@whatlizardry in oil pastels:
@assassin1513 just made it all sparkle a little more:
@jupitertheegg gave Starfire the perfect cosmic couch:
@richo1915 just said what everyone else was thinking:
@aesthetic-sweaters made a Kirby version:
@bird-wells214 another loafer loafing on Carina’s cliff couch:
@troisenator in watercolor:
And finally, some pixel art of the deep field in all its multitudes by @kekness:
Your AB + C past trinity ai with three c3 ai here is my equation for 4 which would range all 3 plus double layer if needed,
so C is passthrough for AB AB etc which we know.
FOUR FOURIER RANGED EULER POSITION for 4 STATIONARY
2 OVER UNDER BUNNY YEARS assuming its' this
youtube
RIGHT?
BUNNY YEARS would be another two death star, imagine that's what happened with grand station sub station mini station 3 points with platform and eco system for circulatory system with economy in mind for value chain of core IMPERIUM manufacturing on IMPERIUM PROPERTY AND GOVERNED WITH GOVERNANCE PROTOCOL AND PROGRAMS IN PLACE.
permittivity of VO2 in the THz region can be described by the following Drude model: ε(ω)=ε∞−(ωp(σ1))2ω2+iγωε(�)=ε∞−(�p(σ1))2�2+���, where ε∞ is the permittivity at high frequency, ωp(σ1) is the conductivity dependent plasmon frequency and γ is the collision frequency46. On the other hand, both ω2p�p2 and σ1 are proportional to the free carrier density. Therefore, the plasmon frequency at σ′1σ1′ can be approximately expressed as ω2p(σ′1)=(σ′1σ1)ω2p(σ1)�p2(σ1′)=(σ1′σ1)�p2(σ1). By fitting the measured THz spectra shown in ref. 37, we determined that when σ1 = 3 × 103 Ω−1 cm−1 (ε∞ = 12), the corresponding ωp = 1.40 × 1015 rad/s, while γ = 5.75 × 1013 rad/s is assumed to be independent of σ1. These Drude model parameters agree well with the experimental results reported by other groups46. In addition, considering the roughly 1 μm thick skin depth of metallic-phase VO2 around 1.0 THz, 3-μm-thick VO2 structures were utilized to constr
SAMSUNG GALAXY PLATFORM BIXBY PRIME AI FOR INTERNAL RESEARCH SRAM
Kim and RESEARCH TEAM have reported that the exceedingly large conductivity change during IMT of VO2 can be utilized to build high-speed next-generation transistors31. It should be noted that in this type of electronic application, the electrical current filaments that arise from a localized transition are responsible for the observed resistance magnitude jumps in the voltage-current curves. Optically, VO2 during transition should be treated as a composite material with permittivity that can be described by effective medium approximations. Indeed, using scanning near-field infrared microscopy, Qazilbash and coworkers have illustrated the percolation progress at the nanometer scale in VO2 thin films, i.e., the portion of metallic state experiences gradual growth with increasing temperature until a complete transition is achieved45. Consequently, the interactions between VO2 films and THz waves are in general dominated by their macroscopic material properties. Various groups have reported the temperature-dependent THz conductivity (σ1) of VO2 thin films deposited on a sapphire substrate37, 46. An approximately three orders of magnitude increase in σ1 indicates the potential of VO2 as an active medium for tunable metamaterials, while, more importantly, the high conductivity exhibited in the metallic state indicates the possibility of further creating hybrid VO2/metal THz resonators and metamaterials with a high degree of tunability.
In this paper, we propose a hybridization of VO2 microstructures with conventional metallic resonating components that will enable highly-active THz metamaterials. Schematics of the four types of VO2 integrated hybrid metamaterials that will be considered here are illustrated in Fig. 1. In particular, the IMT property of VO2 is expected to enable THz radiation manipulation through various mechanisms. Here we consider four different examples, which include tuning the resonance of gap-loaded SRRs (Fig. 1(a)), producing Fan
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