This article reviews the present status of the spin foam approach to the quantization of gravity. Special attention is payed to the pedagogical presentation of the recently introduced new models for four dimensional quantum gravity. The models are motivated by a suitable implementation of the path integral quantization of the Plebanski formulation of gravity on a simplicial regularization. Spins at: Free spins 25 spins Free coins. Although spin-orbit coupling (SOC) in ferroelectrics contributes to the manipulation of the electron spin by an electric field, it also breaks the spin rotation symmetry resulting in the decay of spin polarization. Here, we showed that the 110 Dresselhaus model in the two-dimensional ferroelectrics with in-plane ferroelectricity can host a persistent spin helix and render the spin lifetime.
| Type | Private |
|---|---|
| Industry | Aerospace |
| Headquarters | 4350 E Conant St, , United States |
| |
| Est. 70-100 | |
| Website | www.spinlaunch.com |
| Footnotes / references California Secretary of State,[1] Crunchbase,[2] Built in LA [3] | |
Spin Link 2019 2020
SpinLaunch is a spaceflight technology development company working on mass accelerator technology to move payloads to space.[4] As of January 2020, the company has raised US$80 million in funding, with investors including Kleiner Perkins, Google Ventures, Airbus Ventures, Catapult Ventures, Lauder Partners, John Doerr and Byers Family.[5]
Coin Master 5000 Spin Link 2019
History[edit]
SpinLaunch was founded in 2014 by Jonathan Yaney in Sunnyvale, California. The company's current headquarters are in Long Beach, California.[6] In 2020, SpinLaunch continues development of its 140,000 square-foot (13,000 sq. meter) corporate headquarters in Long Beach, and of its flight test facility at Spaceport America in New Mexico (leased in 2019).[7]
Technology[edit]
SpinLaunch is developing a kinetic energy space launch system that reduces dependency on traditional chemical rockets, with the goal of significantly lowering the cost of access to space while increasing the frequency of launch. The technology uses a vacuum-sealed centrifuge to spin a rocket and then hurl it to space at up to 8,000 kilometres per hour (5,000 mph). The rocket then ignites its engines at an altitude roughly 200,000 foot (61 km) to reach orbital speed of 17,500 miles per hour (28,200 km/h). If successful, the acceleration concept is projected to be both lower cost and to use much less power, with the price of a single space launch reduced by a factor of 20 to under US$500,000.[8][9]
See also[edit]
References[edit]
- ^'Business Search'. businesssearch.sos.ca.gov. California Secretary of State. Retrieved 2 March 2018.CS1 maint: discouraged parameter (link)
- ^'Crunchbase SpinLaunch Overview'. Retrieved 22 January 2020.CS1 maint: discouraged parameter (link)
- ^'Built in LA SpinLaunch Overview'. Retrieved 22 January 2020.CS1 maint: discouraged parameter (link)
- ^Oberhaus, Daniel (15 October 2019). 'Stories of People Who Are Racing to Save Us'. Wired. Retrieved 15 October 2019.
- ^Chowdhry, Amit (20 January 2020). 'SpinLaunch Raises $35 Million for the First Kinetic Launch System'. Pulse 2.0. Retrieved 22 January 2020.
- ^Malik, Tariq (19 June 2019). 'Secretive Startup SpinLaunch Gets 1st Launch Contract for US Military'. Space.com. Retrieved 3 December 2019.
- ^Wall, Mike (16 January 2020). 'Stealth Space Startup SpinLaunch Snares Another $35 Million From Investors'. Space.com. Retrieved 22 January 2020.
- ^Constine, Josh (22 February 2018). 'Stealth space catapult startup SpinLaunch is raising $30M'. TechCrunch. Retrieved 23 February 2018.CS1 maint: discouraged parameter (link)
- ^Oberhaus, Daniel (29 January 2020). 'Inside SpinLaunch, the Space Industry's Best Kept Secret'. Wired. Retrieved 9 February 2021.