Chapter 413 [Youkefang Makerfang Kyushu Tour]

"The laser interferometer is the most important payload in the 'mirror of the sky'. The system includes a laser, a phase meter, and two movable optical subsystems, both of which establish a laser link with the corresponding part of the remote spacecraft..."

Ning Xingqing gushed: "In addition to the optical components, each mobile optical subsystem, including the gravitational wave reference sensor, has a free-floating test mass inside. These gradually constitute the core of the 'Sky Mirror' payload."

"The design baseline of the optical system implements a bundled structure, and the optical measurement of the small change in the distance between the test masses of each interference arm is divided into three measurement parts, namely: the measurement between the local test mass and the local optical test bench; the measurement between the local optical test bench and the The measurement between the remote optical test bench; the measurement between the remote optical test bench and the remote test quality."

At this time, another scientist who participated in the meeting said: "It is very complicated to accurately determine the change of the arm length of the interferometer. There will be relative motion between the spacecraft and the spacecraft due to orbital dissociation, resulting in a relative velocity between the spacecraft. The length of the interference arm is directly affected, which is neither equal nor a constant. Therefore, the laser frequency noise is the most important noise source affecting the measurement."

"Furthermore, the difference frequency between the interferometers is not fixed, and the master laser frequency must be modulated at a preset frequency," he added.

Another scientist who participated in the meeting said: "Suppressing the laser frequency noise caused by unequal arm lengths can be solved by post-data processing methods. After processing the measurement data of a single interferometer on orbit, recombine to generate an equivalent equivalent. Arm length interferometer measurement data. This should be an algorithm that mainly realizes the time-delayed superposition of phase information measured by different detectors on different spacecraft at different times."

Everyone couldn't help but nodded.

It is worth mentioning that Ning Xingqing was designated by the Natural Science Foundation of China as the chief scientist of the "Sky Mirror" project, but to complete this large project requires the cooperation of a large number of scientists from 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, and at the same time define the maximum error of the distance measurement between the 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', and establishing the relationship between single-link measurement error and stress sensitivity, it is possible to reflect the relationship between measurement instrument noise and gravitational wave noise." Sensitivity ratio issue.”

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 error of the interferometric measurement system, 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 quality caused by non-conservative forces, such as solar radiation pressure, electromagnetic force, and the gravitational force between space and space itself."

In the following long discussion, Ning Xingqing discussed a series of technical issues with the scholars present, including optical components, telescopes, optical test benches, gravitational reference sensors, phase measurement systems, laser systems, etc.

At the end, Principal Li Kang, who attended the meeting, sighed: "This is an extremely huge project, and the time limit is so tight. Without the participation of thousands of scientists, it would be impossible to complete."

In other words, to realize the "Mirror of the Sky" project, Xincheng University can't handle it at all. It is thankful to be able to complete 10% of the workload. At least dozens of universities and their related scientific research units need to participate in it.

It is worth mentioning that President Li Kang and the others no longer have doubts about whether the Natural Science Foundation has the strength they said, because they have already learned some new news. The establishment of this institution has important leaders Instructions, this is equivalent to having the endorsement of a public unit.

Although they still have limited knowledge of the background of the Natural Science Foundation of China, the information they have already obtained is great news for them. Don't worry about the problems here, as long as they can come up with a feasible plan, it is also the case now. We are trying our best to solve this problem.

...

Xincheng University is working day and night to demonstrate the "Mirror of the Sky" project, and Fang Hong has already put this matter aside and is not paying attention to it. Professional matters are left to professional people to do, and you can rest assured to wait for the results That's it.

However, during this period of time, Fang Hong has not been idle, and is also planning three new projects.

On Tuesday, September 28, Fang Hong came to Quantum Jump headquarters with materials for three new projects that she personally formulated.

CEO office.

"Boss, the WeChat project has completed various tests. According to the plan, the product will be officially launched during the National Day holiday." Xu Jingren told Fang Hong about the progress of the project as soon as he came over.

"Well, not bad." Fang Hong was holding the mobile phone to briefly experience the internal beta version of WeChat. The product conformed to the strategy he had given before, but Fang Hong did not come here today for the WeChat project. He put the phone aside and looked at Xu Jing Ren said: "Wang Ping, Yuan Jie and the others? Call them over, there is something important to discuss."

Xu Jingren immediately signaled to 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, Xu Jingren couldn't help laughing, and Xu Jingren couldn't help asking curiously: "Is this a new idea?"

Fang Hong nodded with a smile: "Three new projects, the three subsidiaries of Quantum Beat, let Wang Ping, Yuan Jie and Sun Xin be responsible for one each."

Xu Jingren joked: "Is this the rhythm of our quantum beating to break the ground and seal the border?"

Fang Hong corrected: "What adjectives are used, what kind of cracking the soil and sealing the borders, this is called opening up the borders and expanding the land."

Xu Jingren said with a smile: "Open up the border and open up the frontier."

As he said that, Xu Jingren picked up the materials that Fang Hong had brought and took a look. Seeing the names of the subsidiaries whose three projects were confirmed on the materials, he couldn't help but read: "Youkefang, Chuangkefang, Kyushuhang..."

Xu Jingren flipped through a few pages of materials, and began to browse the content of the Youkefang project. After reading it for a while, he couldn't help being quite surprised, and immediately looked at Fang Hong and said, "Boss, this Makerfang project feels very similar to Airbnb to me."

Fang Hong nodded and said, "That's right."

The Chinese name of Airbnb is "Airbnb". It was established in August 2008 in the United States. It is a house rental service website that connects tourists and homeowners who have vacant houses for rent. Users can publish, Search for vacation home rental information and complete the online booking process.

This company is also the originator of "shared accommodation". Ten years later, it was successfully listed at a valuation of US$47 billion.

However, according to the original historical trajectory, Airbnb will eventually withdraw from the Greater China market in ten years. It is really impossible for the sharing homestay companies in the Mainland. Coupled with some mainland policy factors, they will eventually withdraw from the Greater China market. .

The Ukefang project is exactly the benchmark of Airbnb. The company name "Ukefang" has elements of the Internet, and it is also a homonym for "youguo".

The other two projects, Kyushu Tour, focus on the subdivision of "online car-hailing", and the target is Uber in North America. The company was established last year. It will take more than three years for Didi Taxi to appear, but Fang Hong did not use the name Didi.

Of these three projects, Fang Hong’s most important thing is undoubtedly the trip to Kyushu, because it involves the security of National Geographic data. Not only must commercial value be considered, but national security cannot be ignored.

The last project, Chuangkefang, focuses on the subdivision of "coworking". The target is Wework in North America. However, Wework was also established this year, only a few months earlier.

Obviously, these three projects all point to the same factor - the sharing economy.

In the next few years, the sharing economy will continue to be hot, and gods from all walks of life will enter the market one after another to start a money-burning war. Projects such as shared bicycles and shared charging treasures will pop up together. most.

After a while, Sun Xin and Wang Ping also came to Xu Jingren's office. They sat down on the sofa in the rest area. Fang Hong immediately said, "Let's look at the documents first."

Xu Jingren immediately gave the materials to Yuan Jie, and the three of them browsed together, while Xu Jingren looked at Fang Hong and said, "This is the first time I've 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 created by the old American sociology professor Max Felson of Texas State University and Joan Spahn, a professor of sociology of the University of Illinois. Si put forward in the paper published in 1978, this should be the earliest origin, you can look through that paper at that time.”

Yuan Jie couldn't help but raised his head in surprise and said, "Isn't it a concept since 1978? It's been thirty-two years, but boss, your vision is worthy of being well-informed."

Sun Xin couldn't help asking: "What is the sharing economy?"

Fang Hong said in an orderly manner: "Sharing economy, simply put, is to separate the use right and ownership of property rights, so that organizations or individuals with idle resources can transfer the right to use resources to others for a fee. Create value with your own idle resources.”

Wang Ping, who was looking at the materials brought by Fang Hong, saw an overview of the sharing economy on it, and immediately read: "...In theory, 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, the effective allocation of resources and the effective governance of the city can be achieved, and citizens can obtain urban social services more conveniently.”

"The resource provider provides temporarily idle resources or technical services to the demand side of the resource for a fee through the technology platform. The demand side obtains the right to use the resource or enjoy the service, and the provider obtains a market-oriented model of corresponding remuneration."

At this time, Fang Hong said: "Generally speaking, there are five characteristics, one is based on the support of emerging technologies such as the Internet, the Internet of Things, big data, cloud computing, and artificial intelligence; the other is extensive data applications; The optimization and re-allocation of massive, scattered and idle resources; the fourth is the efficient provision of social services in a market-oriented way to meet diversified and individualized social needs; the fifth is that 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 there must be a clear understanding and full awareness in politics. Paying attention to this point will inevitably bring potential huge hidden dangers to the company.”

Didi in Fang Hong's last life made a big mistake on this issue and was punished, so naturally he will not let himself repeat the same mistakes on this issue.

...