News on China's scientific and technological development.

tphuang

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SCMP article about the wider implications for chinese industry from the recent US semiconductor measures against china.

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For those that know, will other parts of the chinese economy suffer from these measures?

Maybe there are, but most of the ones we know about are thoroughly controlled by China. That's probably why the folks in Washington are so panicked about everything.
 

SanWenYu

Captain
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China's fusion experimental device HL-2M generated plasma current of more than 1 million amperes on Oct 19.

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10月19日下午,中核集团科研团队再传佳绩,中国新一代“人造太阳”科学研究取得突破性进展,HL-2M等离子体电流突破100万安培,创造了我国可控核聚变装置运行新记录,标志着我国核聚变研发距离聚变点火迈进了重要一步,跻身国际第一方阵,技术水平居国际前列。
 

taxiya

Brigadier
Registered Member
The purpose of the EM sled is providing test environment for other applications, including something like this rocket sled for ICBM test, but with even higher speed.

该项目将为先进材料、高速空气动力学冲击与碰撞力学等民用前沿基础科学探索研究提供测试保障条件,也可以为制导、引信、惯性导航、救生等前沿装备研制提供新一代高性能试验测试环境。

It is also worthy to note that as the report said
据央视报道,中国阶段性建成并成功运行世界首个电磁驱动地面超高速试验设施 ——“电磁橇”,它可以将吨级及以上物体最高加速到 1030 公里 / 小时的速度,这也创造了大质量超高速电磁推进技术的世界最高速度纪录。
This 1000km/h is first phase, there will be even higher speed coming.

Another patent from BUAA
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stated intention of 1000m/s top speed and 10G acceleration for the same purpose (such as ground test of high speed weapon).
期望可以实现0~10g的地面加速度和1000m/s以上的地面运行直线速度,主要用于航空、航天等武器装备系统以及民用高新技术产品在高速度、高加速度运行过程中的技术问题研究。

The reported project is led by CAS, the patent is from BUAA, but the two could be related as they are for the same purpose and BUAA top scientists are members of CAS.

It also worth to note that the track in this patent is high temperature superconductor EM elevation. Its magnet is at liquid nitrogen temperature, unlike Japan's EDS Maglev which is at liquid helium temperature.

Just in case someone may argue, EDS magnet is inside liquid helium tank which then is inside liquid nitrogen, so the temperature of the magnet is at temperature of liquid helium.
 

SanWenYu

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A team of students from Beihang University set a world record with their ornithopter. The aircraft flew 1h 31m 4.98s on a single charge on July 17 this year.

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北航团队创世界纪录:扑翼式无人机单次充电飞行时间最长​

10月20日,澎湃新闻从北京航空航天大学获悉,近日,北航前沿科学技术创新研究院新概念飞行器团队自主研制与试验的双关节大鸟型扑翼飞行器创造了一项世界纪录:扑翼式无人机单次充电飞行时间最长——飞行器续航时间为1小时31分04秒98。

扑翼飞行(如鸟类般扇动翅膀飞翔)是生物的飞行方式,人类对其探索长达数千年。此前扑翼飞行器飞行时间均较短,大多只能达到半小时左右,显著落后于常规布局的其它类型飞行器,实际应用意义不高,因此扑翼的吉尼斯航时纪录一直处于空缺状态。

北航前沿科学技术创新研究院新概念飞行器团队由焦宗夏教授、赵龙飞副研究员牵头,已在扑翼领域深耕近10年,目标是突破扑翼实用性分析与设计方法,争取在扑翼飞行性能上取得本质突破。

2021年10月,该团队进行了吉尼斯挑战申请。为了纪录立项,吉尼斯纪录机构对国际上现存人造扑翼飞行器进行了充分调研,最终认为如果挑战者扑翼飞行器可以飞行1个小时,将对现存扑翼飞行器形成绝对续航优势,并具有较好的实际应用前景,因此吉尼斯纪录官方将续航1个小时作为扑翼首个航时纪录的立项指标,并将纪录名称确定为“扑翼式无人机单次充电飞行时间最长”。

受到疫情、限飞政策与天气影响,最终的扑翼飞行挑战时间确定于今年7月21日。挑战的全过程严格按照挑战规则,且挑战过程由多位第三方见证人和计时员出席,并多机位进行全程视频记录。

挑战中,当扑翼飞行器成功突破1个小时的续航后,北航团队发现飞行器所剩电力仍然非常充分,于是决定尽可能耗尽电池电量,探索飞行器的极限航时,最后安全降落。

经吉尼斯纪录中国代理与伦敦总部联合审查认证挑战通过,最终飞行器续航时间被认定为1小时31分04秒98。

据北航相关负责人介绍,近百余年间,航空技术高速发展,在具备了先进的理论工具与高效分析手段后,研究人员逐渐发现,即便最先进的飞行器,在很多方面还是与自然界的鸟类、昆虫等飞行生物相差甚远。由此,扑翼研究近年来重新成为研究热点。然而扑翼飞行机理复杂,控制困难,对机械系统要求极高,人造扑翼欲实现飞行能力,困难重重。

北航团队首创“扑翼推进波”理论,并攻破了扑翼正向优化设计难题。相关理论多次发表于AIAA Journal等航空航天顶刊,并对扑翼飞行器的研发起到关键指导性作用。该团队基于上述理论成果进行了翼展20cm至2m的系列扑翼飞行器的样机研制与飞行试验。

本次申请航时纪录的双关节大鸟型扑翼飞行器,其理论飞行效率超过大部分固定翼飞机,于2021年初进行航时初步测试,实际飞行时间达到53分钟。经过动力系统与机翼动力学进一步优化调整,北航团队实现了扑翼机性能的再一次跃升,达成了当前纪录挑战的最佳状态。

在扑翼飞行器研究中,该团队教师充分调动了学生的积极性与创造性。飞行器研制团队学生包含博士生、硕士生与本科生共12人,带动多项硕博士课题,本科生的创造性中间成果多次获得科技竞赛奖项。

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SanWenYu

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A new technology to sense and measure very weak microwaves based on quantum science, developed by scientists from USTC.

News release in Chinese:
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中国科大首次实现基于里德堡原子临界增强的高灵敏微波传感

我校郭光灿院士团队在基于相变的精密测量上取得新进展。该团队史保森、丁冬生课题组与丹麦奥尔胡斯大学的Klaus Mølmer教授和英国杜伦大学的Charles S. Adams教授合作,利用强关联系统的相变提高了里德堡原子对微波电场测量的精度和灵敏度,相关成果以“Enhanced metrology at the critical point of a many-body Rydberg atomic system”为题发表在国际知名学术期刊《Nature Physics》上。

团队利用Fisher information来衡量精度,如图2所示。实验表明,相比于少体无相变的情况,多体系统在临界点的Fisher information具有显著提高,提高了三个数量级。对应于测量精度提升至少一个量级,并且随测量时间的增加而增加,呈现指数增长的趋势。在单体情况下,系统灵敏度约为3.1 μV/cm/Hz^0.5,而在多体情况下,系统对于微波电场的测量灵敏度为49nV/cm/Hz^0.5,提高了60多倍。

Paper published in English:
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Enhanced metrology at the critical point of a many-body Rydberg atomic system​

Abstract​

Interacting many-body systems display enhanced sensitivity close to critical transition points due to diverging quantum fluctuations. This criticality-based enhancement has been suggested as a potential resource for applications in precision metrology. Here we demonstrate many-body critical enhanced metrology for the sensing of external microwave electric fields in a non-equilibrium Rydberg atomic gas. We show that small variations in external driving lead to a large variation in the population of Rydberg states around criticality and to a notable change in the optical transmission signal. For continuous optical transmission at the critical point, we quantify the enhanced sensitivity extracting the Fisher information, which shows a three orders of magnitude increase due to many-body effects compared with single-particle systems. These results demonstrate that critical properties of many-body systems are promising resources for sensing and metrology applications.
 

supercat

Major
Such hurry means only one thing: the U.S. regime is fully aware that time is not on their side.

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I remember someone saying why do all the central banks around the world follow in lockstep when the US raises interest rates. There is your answer. You don’t raise rates = your currency loses value because it’s not worth holding your currency if the other has better rates. Dollar is up against the Yen by ~44% since 2021.
As the perfect stooge of the U.S., Japan doesn't dare to do what China does: dumping as much soon to be worthless U.S. Treasuries as possible, and accumulate as much precious and industrial metals as possible.
 

supercat

Major
Chinese researchers have cultivated a new strain of high-yield rice that can be harvested over multiple years without replanting every year:

China urges farmers to consider new variety of perennial rice​

  • The agriculture ministry is promoting a strain that has higher yields and can be harvested over several years without the need for replanting
  • Researchers say perennial rice can be more cost-effective to produce and is potentially better for the environment

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Douyin is adding e-commerce function to its app. Maybe it can survive in China alone even if it's banned in the rest of the world, because there is so much e-commerce in China?

TikTok’s Chinese version Douyin adds shopping to ByteDance news app, prepares movie ticketing service in e-commerce push​

  • Douyin’s 600 million daily active users will be able to link their accounts to Jinri Toutiao and shop within the popular news aggregation app
  • Douyin has been ramping up efforts to sell goods and services as it seeks to further monetise its massive user base

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Fedupwithlies

Junior Member
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So the annual supercomputing conference is coming up next month, and its just an interesting thing that people should keep an eye on. Last year there was that Chinese team that won the Gordon Bell prize for their work on Quantum Supremacy.

This year there's another Chinese team thats been nominated for the Gordon Bell prize, here:
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I don't think they're likely to win, it looks like their work is more algorithmic than applications, which is vital but not really headline-catching.

Personally I think:
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(particle in cell simulations on supercomputers) is likely, but hey, who knows.
 

Fedupwithlies

Junior Member
Registered Member
So the annual supercomputing conference is coming up next month, and its just an interesting thing that people should keep an eye on. Last year there was that Chinese team that won the Gordon Bell prize for their work on Quantum Supremacy.

This year there's another Chinese team thats been nominated for the Gordon Bell prize, here:
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I don't think they're likely to win, it looks like their work is more algorithmic than applications, which is vital but not really headline-catching.

Personally I think:
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(particle in cell simulations on supercomputers) is likely, but hey, who knows.
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Friend of mine thinks this one is going to win.

Regardless, an interesting time. Trend in the US seems to be using supercomputing to solve biocomputing and biological problems.
 
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