News on China's scientific and technological development.

now noticed the tweet
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Welcome to the
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era! The first batch of 5G base stations in Beijing were opened on Monday, ushering in the 5G era in the city. The number of 5G stations in Beijing is expected to reach 26K by next July, local media reported

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taxiya

Brigadier
Registered Member
Follow-up of the "100km Quantum Radar" reported in 2016. The test was done in 2015.
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, Major highlights and new achievements:
  1. By the same institute Nanjing 14th institute.
  2. Test conducted in Northwest high plateau. I suspect high plateau means less scattering, less decoherence, an early step for practical use.
  3. Radar works in day light. One step closer to be practical useful.
  4. Radar able to track slow moving object. One step closer to be practical useful.
  5. Tested to work in day light at sea level for long range (not saying how long), apparently aiming to address the wave scattering effect.
English report:
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by
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And background information:
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by
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Funny fact is that apparently University of Waterloo in Canada (another leading player in the area together with Lockheed Martin) is not aware of the 2016 announcement by 14th institute as of April 2018, two whole years later.
See here,
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To date, quantum illumination has only been explored in the laboratory. The Government of Canada, under the Department of National Defence’s All Domain Situational Awareness (ADSA) Science & Technology program, is investing $2.7M to expedite its use in the field.

The 54 North Warning System (NWS) radar stations, based in the Arctic and operated by the North American Aerospace Defense Command (NORAD), are nearing the end of their life spans and could need to be replaced as early as 2025.

This project will allow us to develop the technology to help move quantum radar from the lab to the field,” said Baugh. “It could change the way we think about national security.”
Either someone is lying or burying head in the sand.
 

Hendrik_2000

Lieutenant General
Across China is now running program on 3 gorge dam When it was built they need to relocate 1.3 million people from flooded farm land and villages It is tough for people who for generation lives on those land . But they sacrifices their land for the common good The western press vilify China for uprooting 1.3 million people
This program follow the story what happened to those people since. Lives goes on and tough people moves on Some even thrive Some lives close nearby the dam but most of them spread all over the country mostly to eastern seaboard province of Jiangsu, Zhejiang, Fujian, Guangdong. It is heart warming story
 
now noticed the tweet
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Le mirror en carbure de silicium de 4,03 mètres de diamètre, conçu par l'Académie chinoise des Sciences, a passé les essais d'acceptation avec succès. Il est utilisé dans la prochaine génération de systèmes d'observation optiques chinois.

Translated from French by
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The 4.03-metre-diameter silicon carbide mirror, designed by the Chinese Academy of Sciences, passed the acceptance tests successfully. It is used in the next generation of Chinese optical observation systems.

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now I read (mind-boggling '4D -- 5G connection' inside)
Chinese researchers develop world's first-ever 4D printing for ceramics
Xinhua| 2018-08-18 02:22:19
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Chinese researchers have developed the world's first-ever 4D printing for ceramics that are mechanically robust and can have complex shapes, offering broad potential applications in telecommunications, electronics and even space exploration.

Researchers at City University of Hong Kong reported in a study published on Friday in the journal Science Advances a novel "ceramic ink," a mixture of polymers and ceramic nanoparticles.

The 3D-printed ceramic precursors printed with this novel ink are soft and can be stretched three times beyond their initial length, according to the study.

These flexible and stretchable ceramic precursors allow complex shapes, such as origami folding. With proper heat treatment, ceramics with complex shapes can be made, making them the 4D ceramics.

4D printing is conventional 3D printing combined with the additional element of time as the fourth dimension, where the printed objects can re-shape or self-assemble themselves over time with external stimuli, such as mechanical force, temperature, or a magnetic field.

The existing 3D-printed ceramic precursors, which are usually difficult to deform, also hinder the 4D printing of ceramics with complex shapes.

The researchers led by Lv Jian, chair professor of mechanical engineering, made use of the elastic energy stored in the stretched precursors for shape morphing.

When the stretched ceramic precursors are released, they undergo self-reshaping and after heat treatment, the precursors turn into ceramics.

The resultant elastomer-derived ceramics are mechanically robust. They can have a high compressive strength-to-density ratio and can come in large sizes with high strength compared to other printed ceramics.

"With the versatile shape-morphing capability of the printed ceramic precursors, its application can be huge," said Lv.

One promising application will be for electronic devices because ceramic materials have much better performance in transmitting electromagnetic signals than metallic materials. With the arrival of 5G networks, ceramic products will play a more important role in the manufacture of electronic products.

Also, the artistic nature of ceramics and their capability to form complex shapes also provide the potential for consumers to tailor-make uniquely designed ceramic mobile phone back plates.

Furthermore, this innovation can be applied in aero industry and space exploration. "Since ceramic is a mechanically robust material that can tolerate high temperatures, the 4D-printed ceramic has high potential to be used as a propulsion component in the aerospace field," said Lv.
 

supercat

Major
Apple may build China’s BeiDou navigation into future iPhones

Hooking up with BeiDou would be relatively simple, and would score points with Chinese regulators and consumers

Even as Apple finds itself caught in a protracted trade war between Beijing and Washington, the tech juggernaut is now being seen as more compliant to the wants and needs of Beijing.

This comes when there are signs that policymakers in Zhongnanhai may want to make use of Apple’s reliance on the Chinese market. This could be done by applying red tape or enforcing more stringent labor rules to suppress the iPhone maker’s manufacturing and marketing in the country, and could be justified as a reprisal for increased tariffs threatened by the Trump administration.

Apple recently outsourced its iCloud storage services for users in mainland China to a Guizhou-based big data processor. This prompted criticism of what some saw as Apple caving into Beijing, since the company normally operates its own data centers. There have also been reports that the US behemoth may become one of the biggest clients of China’s BeiDou satellite navigation system.

Chinese papers have been speculating that the much hyped and much awaited new lineup of iPhones, Apple Watches and other iOS devices soon to be unveiled in mid-September may include support for the BeiDou system.

If so, the next generation iPhones will become the first iPhone series to be compatible with BeiDou, at a time when many of China’s domestic smartphone offerings still use GPS.

BeiDuo may be all set to present a serious challenge to GPS, though it is still not clear how many buyers in China or elsewhere will favor switching systems. However some Chinese consumers have threatened to boycott the new iPhones if Apple fails to incorporate the BeiDou navigation system.

The iPhone X, the current flagship model launched last year, added two major navigation systems – Europe’s Galileo and Japan’s Quasi-Zenith – but not the BeiDou system, though new Samsung smartphones have already hooked up with BeiDou.

If Apple executives want to further forge amicable ties with Chinese regulators and lure more discerning, patriotic Chinese customers, adding BeiDou to its iPhones may be a logical move.

The People’s Daily quoted a Beijing-based IT expert as saying that it wouldn’t be too difficult for Apple to add support for the BeiDou system as the processors and chips used for iPhones are largely compatible with China’s indigenous system.

Earlier reports emerged saying that new iPhones will be equipped with Broadcom’s new BCM47755, hailed as “the world’s first mass-market, dual-frequency” global navigation satellite system receiver.

The new chip takes advantage of today’s greater availability of L1 and L5 frequency bands beamed from satellite constellations, and uses a combination of the two frequencies instead of one to compute a position.

The chip is equipped to receive signals from GPS satellites, Russia’s Glonass, Europe’s Galileo, and China’s BeiDou.

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Yesterday at 9:27 PM
now noticed the tweet
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Le mirror en carbure de silicium de 4,03 mètres de diamètre, conçu par l'Académie chinoise des Sciences, a passé les essais d'acceptation avec succès. Il est utilisé dans la prochaine génération de systèmes d'observation optiques chinois.

Translated from French by
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The 4.03-metre-diameter silicon carbide mirror, designed by the Chinese Academy of Sciences, passed the acceptance tests successfully. It is used in the next generation of Chinese optical observation systems.

DlIfCF4U4AAU9Xj.jpg
now
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China has developed a high accuracy 4-meter-aperture silicon carbide aspheric optical mirror, an important tool for deep space and astronomical observation

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Hendrik_2000

Lieutenant General
Building high tech factory.for semiconductor and LCD. Since no one is willing to transfer the technology China has to do it themselves. No wonder it take a long time to build it. It is huge 950 m long,3 or 4 X aircraft carrier and must be built with exacting demand
The program show how they built clean room and ultra pure water
 
Last edited:

Equation

Lieutenant General
Building high tech factory.for semiconductor and LCD. Since no one is willing to transfer the technology China has to do it themselves. No wonder it take a long time to build it. It is huge 950 m long,3 or 4 X aircraft carrier and must be built with exacting demand
The program show how they built clean room and ultra pure water
Looks like China 2025 is coming along just fine...with or without a "trade war" and tariffs.:D
 
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