X And The 4th [BETTER]
X And The 4th ---> https://tlniurl.com/2thX1h
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Landau levels at Weyl nodes. Filled (empty) circles denote occupied (empty) LLs. Each node has nonchiral LLs that disperse parabolically in the field direction (here, z^) as well as a single chiral LL that disperses according to the node chirality (red and blue circles and lines). A chemical potential imbalance between the nodes leads to a net current flowing along the field, even for spatially uniform μ.
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Quantum spin Hall (QSH) insulators, a new class of quantum matter, can support topologically protected helical edge modes inside a bulk insulating gap, which can lead to dissipationless transport. A major obstacle to reaching a wide application of QSH is the lack of suitable QSH compounds, which should be easily fabricated and have a large bulk gap. Here, we predict that single-layer ZrTe5 and HfTe5 are the most promising candidates for large-gap insulators, with a bulk direct (indirect) band gap as large as 0.4 eV (0.1 eV) and which are robust against external strains. The three-dimensional crystals of these two materials are good layered compounds with very weak interlayer bonding, and they are located near the phase boundary between weak and strong topological insulators, paving a new way for future experimental studies on both the QSH effect and topological phase transitions.
In this paper, we predict, based on first-principles calculations, that two known layered thermoelectric compounds, ZrTe5 and HfTe5, are also the most promising candidates for QSH materials to date. We find that their interlayer coupling is as weak as that in graphite (which gives rise to graphene) and that their single-layer sheets are large-gap QSH insulators, which are also robust against external strains. The weak interlayer coupling should lead to relative ease in material fabrication, and the bulk gap of the monolayer sheets is large enough to support applications at room temperature.
(a) The crystal structure. (b) The bulk Brillouin zone (BZ) and the projected surface BZ of 3D ZrTe5 (HfTe5). (c), (d), and (e) The side view, top view, and BZ of the single-layer structure, respectively. In (d), the inversion center is indicated by the red star symbol, and the waved grid of the Te square lattice sheet is shown by the pink dotted lines.
The calculated electronic structures of single-layer ZrTe5. (a) The density of states. (b) and (c) The band structures without and with SOC, respectively. The valence-band maximum (VBM) and conduction-band minimum (CBM) defining the indirect band gap are indicated in (c). (d) and (e) The calculated edge states for the x and y edges, respectively (see the main text for details).
The calculated band gaps of single-layer ZrTe5 as a function of volume change. Both the direct gap at Γ and the indirect band gap are shown. The nontrivial Z2 topology survives as long as the band gap at Γ remains positive.
The calculated band structures and surface states for 3D ZrTe5. Panels (a) and (b) are for the bulk. Panels (c) and (d) are for the top surface, and panels (e) and (f) are for the side surfaces, as indicated in Fig. 1. The weak TI (WTI) solutions (left panels) are obtained by using optimized lattice parameters, while the strong TI (STI) solutions (right panels) are from the experimental ones. (See main text for details.)
A schematic picture of the 40-unit-cell-thick slab used to calculate edges states. (a) The asymmetric slab terminated with a Te zigzag chain and a ZrTe3 prism chain for the x edge. (b) The symmetric slab for the y edge.
Flight testing of the X-4 began in 1948, and in 1950 both X-4s were turned over to the NACA (National Advisory Committee for Aeronautics), predecessor to NASA (National Aeronautics and Space Administration). The first X-4 was grounded after only 10 flights, and only the second X-4 (on display at the museum) was used in the joint USAF/NACA program. Instability of the X-4 at high speed led to the conclusion that semi-tailless aircraft were not suitable for transonic flight (with the technology then available).
TECHNICAL NOTES:Engines: Two Westinghouse XJ30 turbojet engines of 1,600 lbs. thrust eachMaximum speed: 640 mphMaximum endurance: 44 minutesService ceiling: 44,000 feet
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After the events of Mega Man X4, an imperfect reconstruction of this armor created by Alia[2] can also be used in Mega Man X5. If X is chosen at the Character Select screen at the start of a new game, he will begin the game with the armor equipped, and it will be available for the rest of the game. It has a weaker version of the Plasma Charge Shot, the effects of the Head Parts were reduced, and the Nova Strike is unavailable. If Zero is chosen instead, the armor will become damaged in the Opening Stage and the armor becomes unavailable for the rest of the game.
The Fourth Armor made an appearance in the manga version of Mega Man X4. After a bruising fight for his life against rogue Repliforce soldier Frost Walrus where X barely escaped with his life thanks to the General's timely intervention, X decided that he needed more power to defeat the Repliforce and stop their coup d'etat. He returned to the Kagikira Forest where he had defeated Web Spider of the Repliforce Guerrilla Unit earlier and obtained the Ultimate Armor from Dr. Light's hidden capsule there. However, Light warned him that the armor's power could be a double-edged sword and deeply affect him in unforeseen ways. Thus, X becomes a much more powerful and ruthless warrior.
With the power of the Ultimate Armor, X single-handedly defeats remaining Repliforce sub-commanders Slash Beast and Storm Owl, and is able to defeat the power-hungry Maverick Magma Dragoon as well at a volcano after being ambushed there. Then, X ventures to the Repliforce space station Final Weapon that holds a \"Death Flower\" weapon capable of decimating the entire planet with a single blast and confronts the General, severely wounding him in combat and knocking him out. But suddenly, Repliforce's deadly weapon is activated by a mysterious yellow Maverick who X had previously encountered at an abandoned laboratory.
X then engages the Maverick in battle, who reveals himself to be none other than Double, X's loyal subordinate. Double than slashes at X wildly and injures him, but he quickly recovers thanks to the Ultimate Armor and smashes right through Double with a Nova Strike, furious with his treachery. Double's body disintegrates. General then rises up behind X who frantically shoots at him with buster shots that do not damage him, but instead of killing X the General hugs him, and then sacrifices himself by slamming his own body into the Death Flower and destroying it. 153554b96e
https://www.xr4ped.eu/forum/gear-reviews/c-for-arm-microcontrollers-by-david-and-rob-miles