"The laser interferometer is the most important payload in the 'Sky Mirror', and the system consists of a laser, a phase meter, and two movable optical subsystems, both of which establish a laser link with the corresponding part of the far-end spacecraft......"

Ning Xingqing gushed out: "In addition to the optical components, each mobile optical subsystem, which contains a gravitational wave reference sensor, has a free-levitation test quality inside. These gradually form 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 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 test bench; Measurements between the local optics bench and the remote optics bench; Measurement between the quality of the remote test of the remote test bench in the remote optical test bench. ”

At this time, another scientist at the meeting said: "It is very complex to accurately determine the variation of the interferometer arm length, and there is a relative velocity between the spacecraft due to the relative motion of the spacecraft due to the orbital dissociation. Directly affected is the interference arm length, which is neither equal nor a constant. Therefore, laser frequency noise is the most important source of noise affecting the measurement. ”

He adds: "In addition, the differential frequency between the interferometers is not fixed, and the main laser frequency must be modulated according to the preset frequency. ”

Another scientist at the meeting said: "The suppression of laser frequency noise caused by unequal arm length can be solved by post-data processing methods, where the measurement data of a single interferometer in orbit is processed and then recombined to generate the equivalent interferometer measurement data of equal arm length." This should be an algorithm that mainly implements the time-delay superposition of phase information measured by different detectors on different spacecraft at different times. ”

Everyone couldn't help but nod.

It is worth mentioning that Ning Xingqing was designated by the Natural Science Foundation as the chief scientist of the "Sky Mirror" project, but to complete this big project, a large number of scientists in different fields need to work together to achieve it.

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, and the engineering and technical requirements of the top-level system are defined according to the 'single-link measurement error', and the maximum error of distance measurement between the two test masses of any interference arm is defined at the same time. ”

A scholar next to him nodded: "Well, by planning the conversion formula from 'detector noise' to 'gravitational wave noise', the relationship between single-link measurement error and stress sensitivity can be established, which can reflect the ratio of measurement instrument noise to gravitational wave sensitivity." ”

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 interferometric systematic error, but also the movement of the test mass caused by non-conservative forces. ”

"In order 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 gravitational force between astronautics itself," the scholar next to him emphasized. ”

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

At the end, President Li Kang, who attended the meeting, sighed: "This is an incomparably huge project, and the time requirements are so urgent, it is impossible to complete without the participation of thousands of scientists." ”

In other words, the realization of the "Sky Mirror" project is simply not possible at Xincheng University, and it is thankful that it can complete 10% of the workload, and at least dozens of universities and their related research institutes will need to participate in it.

It is worth mentioning that President Li Kang and his colleagues no longer doubt whether the Natural Science Foundation has the strength they say, because they have learned some new news, and the establishment of this institution has important leadership instructions, which is equivalent to the endorsement of public units.

Although they still have limited knowledge of the background of the Natural Science Foundation, the information they have is already great news for them, and they don't have to worry about this problem, as long as they can come up with a feasible plan, they are now working hard to overcome this problem.

……

Xincheng University is studying day and night to demonstrate the "Sky Mirror" plan, and Fang Hong has already put this matter aside and not paying attention to it, leaving professional things to professional people, just wait for the results.

However, during this time, Fang Hong was not idle, and was also working on the layout of three new projects.

On Tuesday, September 28, Fang Hong came to the headquarters of Quantum Beat with materials for three new projects formulated by her.

CEO's Office.

"Boss, the WeChat project has completed various tests, and according to the plan, the product can be officially released during the National Day holiday." As soon as Fang Hong came over, Xu Jingren told him about the progress of the project.

"Well, that's good." Fang Hong is holding his mobile phone to briefly experience the internal beta version of WeChat, the product is in line with the strategy he gave before, but Fang Hong is not here for the WeChat project today, he put the phone aside and looked at Xu Jingren and said: "Wang Ping, Yuan Jie, what about them?" Call them over, there's something important to discuss. ”

Xu Jingren immediately signaled to his assistant, and Zhuang Youmin understood his meaning and went to call Wang Ping and Yuan Jie to inform the co-founders of the company.

Seeing a file of materials brought by Fang Hong, he couldn't help but laugh, Xu Jingren couldn't help but be curious: "Is this a new idea?" ”

Fang Hong smiled and nodded: "Three new projects, quantum beating the entire three subsidiaries, let Wang Ping, Yuan Jie and Sun Xin each be responsible for one." ”

Xu Jingren quipped: "Let's quantum beat, is this the rhythm of tearing the earth and sealing the territory?" ”

Fang Hong corrected: "What adjectives are used, what kind of land is split and sealed, this is called opening up the territory and expanding the territory." ”

Xu Jingren said with a smile: "Open up the territory." ”

As he spoke, Xu Jingren picked up the materials brought by Fang Hong and took a look, and when he saw the names of the subsidiaries determined by the three projects on the materials, he couldn't help but read: "Youkefang, Makerfang, Kyushu Xing......"

Xu Jingren flipped through a few pages of materials and began to browse the content of the Youke Fang project, and couldn't help but be quite surprised after reading it for a while, and immediately looked at Fang Hong and said: "Boss, this Maker Fang project feels very similar to Airbnb." ”

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

Airbnb, whose name is "Airbnb" in Chinese, is a U.S. rental service website founded in August 2008 to connect travelers and homeowners with available rentals, users can post, search for vacation home rental information and complete the online reservation process through the Internet or mobile app.

This company is also the originator of "shared accommodation", ten years later, it was successfully listed at a valuation of 47 billion US dollars, and its market value reached 140 billion US dollars at its peak, which is close to one trillion yuan without considering exchange rate changes.

However, according to the original historical trajectory, Airbnb will eventually withdraw from the Greater China market in ten years, which is really unable to roll up the mainland sharing homestay companies, plus some mainland policy factors, and finally withdraw from the Greater China market.

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

The other two projects, Kyushu Bank, this project is focused on the "online car-hailing" subdivision, the target is North America's Uber (Uber), the company was established last year, as for the domestic side of the basic online car-hailing, the emergence of Didi taxi will have to wait more than three years later, but Fang Hong did not use the name Didi.

The most important thing for Fang Hong in these three projects is undoubtedly the trip to Kyushu, because it involves the security of national geographic data, not only to consider the commercial value, but also to the national security that cannot be ignored.

The last project, Maker's Workshop, which focuses on the "co-working" segment, is aimed at Wework in North America, but Wework was also established this year, just a few months earlier.

It's clear that all three projects point to the same factor – the sharing economy.

In the next few years, the sharing economy continued to be hot, and all kinds of gods and goddesses entered the scene to start a money-burning war.

After a while, Sun Xin, Wang Ping and the three of them also came to 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 browsed together, while Xu Jingren looked at Fang Hong and said: "Sharing economy, it's the first time I've heard of it, boss, this is your creative new concept?" ”

Fang Hong shook his head and smiled: "It's not me, the term sharing economy has been around for a long time, and it should have been proposed by Marcos Felson, a professor of sociology at the University of Illinois, and Joan Spanger, a professor of sociology at the University of Illinois, in a paper published in 1978. ”

Yuan Jie couldn't help but look up and said in surprise: "The concept existed in 1978?" It's been thirty-two years, but you're a well-informed person, boss. ”

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

Fang Hong said in an orderly manner: "The sharing economy, simply put, is to separate the right to use and ownership of property rights, so that institutions or individuals with idle resources can transfer the right to use resources to others for a fee, so that the transferor obtains returns, and the sharer uses the sharing of his idle resources to create value." ”

Wang Ping, who was looking at the materials brought by Fang Hong, saw that there was an overview of the sharing economy above, and immediately read: "...... Theoretically, the sharing economy is a new economic model that optimizes resource allocation and efficient social governance, which is based on the support of modern information technology such as the Internet, and achieves the effective allocation of resources and the effective governance of the city through the integration of technology platforms, so that citizens can obtain urban social services more conveniently. ”

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

At this time, Fang Hong said: "Generally speaking, there are five characteristics, one is based on the Internet, Internet of Things, big data, cloud computing, artificial intelligence and other emerging technology support; second, a wide range of data applications; the third is to realize the optimal reallocation of massive, scattered and idle resources through sharing; Fourth, it provides social services efficiently in a market-oriented manner to meet diversified and personalized social needs; Fifth, the sharing economy has the characteristics of quasi-public goods. ”

When talking about the fifth feature, 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, it is necessary to have a clear understanding and full awareness in politics, if you do not pay attention to this point, it will inevitably bring potential huge hidden dangers to the company." ”

Fang Hong's Didi in the previous life made a big mistake on this issue and was beaten up, so naturally he would not let himself repeat the mistakes of the past on this issue.

……