"The laser interferometer is the most important payload in the 'Sky Mirror'. The system includes a laser, a phase meter and two movable optical subsystems, all of which establish laser links with corresponding parts of the remote spacecraft..."
Ning Xingqing gushed: "In addition to optical components, each mobile optical subsystem, including a gravitational wave reference sensor, contains a freely suspended test mass. These gradually form the core of the 'Sky Mirror' payload."
"The design baseline of the optical system implements a bundled structure. The optical measurement of small changes in the test mass spacing of each interference arm is divided into three measurement parts, namely: the measurement between the local test mass and the local optical experimental bench; the measurement between the local optical experimental bench and
Measurement between the remote optical experimental station; measurement between the remote optical experimental station and the remote test mass.”
At this time, another scientist participating in the meeting said: "It is very complicated to accurately determine the change in the arm length of the interferometer. Relative motion will occur between spacecrafts due to orbital dissociation, resulting in relative speeds between spacecrafts.
.What is directly affected is the length of the interference arm, which is neither equal nor a constant. Therefore, laser frequency noise is the most important noise source affecting the measurement."
He added: "In addition, the difference frequency between the interferometers is not fixed, and the main laser frequency must be modulated according to the preset frequency."
Another scientist participating in the meeting said: "Suppressing laser frequency noise caused by unequal arm lengths can be solved through post-data processing methods. After processing the measurement data of a single interferometer in orbit, it is recombined to generate an equivalent equivalent
Arm-length interferometer measurement data. This should be an algorithm that mainly implements the time-delay superposition of phase information measured by different detectors on different spacecrafts at different times."
Everyone couldn't help but nodded.
It is worth mentioning that Ning Xingqing was designated by the Natural Science Foundation as the chief scientist of the "Sky Mirror" project, but completing this large project requires the cooperation of a large number of scientists in different fields.
After a while, Ning Xingqing looked at everyone and said: "Once the arm length of the interferometer is determined, the engineering technical requirements can be derived from the stress sensitivity. The engineering technical requirements of the top-level system are based on the 'single link measurement error'
Defined, it also defines the maximum error in distance measurement between two test masses of any interference arm."
A scholar next to him nodded and said: "Well, by planning the conversion formula from 'detector noise' to 'gravitational wave noise', establishing the relationship between single-link measurement error and stress sensitivity can reflect the relationship between measurement instrument noise and gravitational waves."
Sensitivity ratio problem.”
Ning Xingqing wrote a formula and said: "The single-link measurement error is expressed by the -1/2 power of pm-Hz, which includes not only the interference measurement system error, but also the movement of the test mass caused by non-conservative forces.
"
The scholar next to him emphasized: "To achieve effective detection of gravitational waves, it is necessary to suppress the disturbance of the test mass caused by non-conservative forces, such as solar radiation pressure, electromagnetic field force and the gravity of spaceflight itself."
In the long discussion that followed, Ning Xingqing discussed a series of technical issues with the scholars present, including optical components, telescopes, optical experimental benches, gravity reference sensors, phase measurement systems, laser systems, etc.
At the end, Principal Li Kang who was present at the meeting sighed: "This is an extremely huge project, and the time requirement is so tight. Without the participation of thousands of scientists, it would be impossible to complete."
In other words, to realize the "Sky Mirror" project, Xincheng University cannot handle it at all. It is thankful to be able to complete 10% of the workload. At least dozens of universities and related scientific research units need to participate to achieve it.
It is worth mentioning that President Li Kang and others no longer doubt whether the Natural Science Foundation has the strength it claims, because they have learned some new information and there are important leaders in the establishment of this institution.
Instruction is equivalent to endorsement by a public entity.
Although they still have limited knowledge of the background of the Natural Science Foundation, the information they have obtained is already great news for them. There is no need to worry about the problem here, as long as they can come up with a feasible plan, which is the case now.
Efforts are being made to overcome this problem.
…
Xincheng University is researching day and night to demonstrate the "Sky Mirror" plan, but Fang Hong has already put this matter aside and is not paying attention. Professional matters are left to professionals, and he can wait for the results with peace of mind.
That’s it.
However, Fang Hong has not been idle during this period, and is also working on the layout of three new projects.
On Tuesday, September 28, Fang Hong came to the Quantum Beat headquarters with materials for three new projects that she personally formulated.
CEO office.
"Boss, the WeChat project has completed various tests, and the product will be officially launched during the National Day holiday as planned." Xu Jingren told Fang Hong about the progress of the project as soon as he came over.
"Well, not bad." Fang Hongzheng took his mobile phone to briefly experience the internal beta version of WeChat. The product was in line with the strategy he had given before. However, Fang Hong was not here for the WeChat project today. He put the phone aside and looked at Xu
Jing Ren said: "Where are Wang Ping, Yuan Jie and the others? Call them over. There are important things to discuss."
Xu Jingren immediately informed his assistant, and Zhuang Youmin understood what he meant and called Wang Ping and Yuan Jie, the co-founders of the company.
Seeing a material file brought by Fang Hong, he couldn't help but smile. Xu Jingren couldn't help but wonder: "Is this another new idea?"
Fang Hong nodded with a smile: "Three new projects, Quantum Beat has three subsidiaries, and Wang Ping, Yuan Jie and Sun Xin are each responsible for one."
Xu Jingren joked: "Is our quantum beat going to break up the soil and seal the territory?"
Fang Hong corrected him: "What adjective are you using? It means splitting the soil and sealing the territory. This is called opening up the territory and expanding the territory."
Xu Jingren smiled and said: "Open up borders and open up borders."
As he said that, Xu Jingren picked up the materials that Fang Hong brought and took a look at them. When he saw the names of the three subsidiaries confirmed for the project on the materials, he couldn't help but read: "Ukom, Maker, Jiuzhouxing..."
Xu Jingren flipped through a few pages of materials and began to browse the contents of the Ukombox project. After reading for a while, he couldn't help but be quite surprised. He immediately looked at Fang Hong and said: "Boss, this Maker Workshop project feels very similar to Airbnb to me."
Fang Hong nodded and said, "That's right."
Airbnb's Chinese name is "Airbnb". It was established in the United States in August 2008 as a home rental service website that connects tourists and homeowners who have vacant rooms for rent. Users can publish through the Internet or mobile applications.
Search vacation home rentals and complete the online booking process.
This company is also the originator of "shared accommodation". Ten years later, it was successfully listed with a valuation of US$47 billion. Its market value once reached a peak of US$140 billion, which is close to one trillion yuan regardless of exchange rate changes.
However, according to the original historical trajectory, Airbnb will eventually withdraw from the Greater China market in ten years. It is really unable to win over the shared homestay companies in the Mainland. Coupled with some mainland policy factors, it will eventually withdraw from the Greater China market.
.
The Ukomfang project is a benchmark for Airbnb. The company name "Ukomfang" carries elements of the Internet, and is also a homophone for "visitors."
The other two projects, Jiuzhouxing, are focused on the "online ride-hailing" segment. The target is Uber in North America. The company was established last year. As for China, there is basically no online ride-hailing.
The emergence of Didi Taxi would have to wait more than three years, but Fang Hong did not use the name Didi.
Of these three projects, Fang Hong's most important one is undoubtedly the trip to Jiuzhou, because it involves the security of national geographic data. Not only must the commercial value be considered, but national security cannot be ignored.
The last project, Maker Workshop, is focused on the "shared office" subdivision. The target is Wework in North America, but Wework was also established this year, just a few months early.
Obviously, these three projects all point to the same factor - the sharing economy.
In the next few years, the sharing economy continues to be popular, and gods from all walks of life have entered the scene to start a money-burning war. Shared bicycles, shared power bank and other projects have popped up together. Of course, there are many people who have ended up with nothing, even some.
most.
After a while, Sun Xin and Wang Ping also arrived at Xu Jingren's office. They came to the sofa in the rest area and sat down. Fang Hong immediately said: "Let's take a look at the documents first."
Xu Jingren immediately gave the materials to Yuan Jie, and the three of them gathered around to browse. Xu Jingren looked at Fang Hong and said, "This is the first time I have heard of the sharing economy. Boss, is this your new creative concept?"
Fang Hong shook his head and smiled: "It's not me. The term sharing economy has been around for a long time. It should have been first coined by Marcos Felson, a sociology professor at Texas State University in the United States, and Joan Spann, a sociology professor at the University of Illinois.
Si proposed it in a paper published in 1978. This should be the earliest origin. You can read that paper and take a look at it."
Yuan Jie couldn't help but raised his head and said in surprise: "The concept existed in 1978? It must have been thirty-two years ago, but boss, you are indeed well-informed."
Sun Xin couldn't help asking: "What is the sharing economy?"
Fang Hong said methodically: "The sharing economy, simply put, is to separate the use rights and ownership of property rights, allowing institutions or individuals with idle resources to transfer resource use rights to others for a fee, the transferor gets rewards, and the sharer uses and shares
Create value from your own idle resources.”
Wang Ping, who was looking at the materials brought by Fang Hong, saw an overview of the sharing economy and immediately said: "...Theoretically, the sharing economy is a new economic model that optimizes resource allocation and efficient social governance.
Based on the support of modern information technology such as the Internet, through the integration of technology platforms, we can achieve effective allocation of resources, effective governance of the city, and citizens can more conveniently obtain urban social services."
"The resource provider provides temporarily idle resources or technical services through the technology platform to the demander of the resource for a fee, the demander obtains the right to use the resource or enjoys the service, and the provider obtains corresponding compensation."
At this time, Fang Hong said: "In general, there are five characteristics. One is based on the support of emerging technologies such as the Internet, Internet of Things, big data, cloud computing, and artificial intelligence; the second is extensive data application; the third is achieved through sharing
Optimization and reallocation of massive, dispersed and idle resources; fourth, the efficient provision of social services in a market-oriented manner to meet diverse and personalized social needs; fifth, the sharing economy has the characteristics of quasi-public goods."
When talking about the fifth characteristic, Fang Hong looked at Wang Ping and the three of them and emphasized: "It is precisely because the sharing economy has the characteristics of quasi-public goods that we must have a clear understanding and full awareness of politics. If we do not
Paying attention to this point will definitely bring potential huge hidden dangers to the company."
Didi in Fang Hong's previous life made a big mistake on this issue and was slapped down, so naturally he would not let himself make the same mistake again on this issue.
