News on China's scientific and technological development.

PeoplesPoster

Junior Member
Xiaomi has always been value for money and Huawei has always been the best you can get for money. In other words, Xiaomi is cheaper but still really good. Having used both and am right now typing this on a Xiaomi and wearing a Huawei watch, both are great. Depends on what your looking for. One size does not fit all.
and at this time at least, you can use Xiaomi phones overseas fairly easily where as with Huawei your stuck trying to side load things like google maps etc.
 

birdlikefood

Junior Member
Registered Member
On the morning of November 1, the “PubScholar Public Welfare Academic Platform” (
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) was officially launched at the Documentation and Information Center of the Chinese Academy of Sciences.

The "Public Welfare Academic Platform" aims to provide high-quality public welfare academic resources for my country's science and technology community and the whole society, and provide basic services such as academic resource retrieval and discovery, content acquisition, exchange and sharing. The platform is mainly built by the Documentation and Information Center of the Chinese Academy of Sciences, the Computer Network Information Center of the Chinese Academy of Sciences, and China Science and Technology Publishing and Media Co., Ltd. (Science Press). It has received support from relevant publishers, scientific journals, scientific research institutions, and scientific researchers. It has innovated Academic resource co-construction and sharing model.​

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caudaceus

Senior Member
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honestly a little surprised it's taken this long from Lidars to be the next point of scrutiny
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but if they are getting concerned about anything with chips, why would Lidar not be a security concern
U.S. lidar options work fine for vehicles that travel at low speeds, but Hesai is the only option that meets specific safety requirements for driving at highway speeds, Burnette said, which is why most autonomous driving companies use Hesai.

LMAOOOOOO. Having said that I am surprised that Hesai is racing ahead of Robosense.
 

SanWenYu

Captain
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USTC developed "active photonic paints" that contain particles of circularly polarized luminescence (CPL) materials and painted stereoscopic 3D images on meter-wide flexible textile fabric with inkjet printer.

Paper:
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Processable circularly polarized luminescence material enables flexible stereoscopic 3D imaging​

Abstract​

Endowing three-dimensional (3D) displays with flexibility drives innovation in the next-generation wearable and smart electronic technology. Printing circularly polarized luminescence (CPL) materials on stretchable panels gives the chance to build desired flexible stereoscopic displays: CPL provides unusual optical rotation characteristics to achieve the considerable contrast ratio and wide viewing angle. However, the lack of printable, intense circularly polarized optical materials suitable for flexible processing hinders the implementation of flexible 3D devices. Here, we report a controllable and macroscopic production of printable CPL-active photonic paints using a designed confining helical co-assembly strategy, achieving a maximum luminescence dissymmetry factor (glum) value of 1.6. We print customized graphics and meter-long luminous coatings with these paints on a range of substates such as polypropylene, cotton fabric, and polyester fabric. We then demonstrate a flexible textile 3D display panel with two printed sets of pixel arrays based on the orthogonal CPL emission, which lays an efficient framework for future intelligent displays and clothing.


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中国科大在基于圆偏振发光的柔性3D显示研究中取得新进展

柔性3D显示在下一代可穿戴、智能电子科技领域具有重要意义。近日,中国科学技术大学庄涛涛研究员课题组和俞书宏院士研究团队在可打印的手性圆偏振发光材料及其柔性3D图像显示应用方面取得重要进展。相关成果以“Processable circularly polarized luminescence material enables flexible stereoscopic 3D imaging”为题发表在国际著名学术期刊《科学·进展》(Sci. Adv.2023,9, eadi9944)上。

手性是自然界中一种重要的几何构象,能够显著影响物质性能。手性科学对化学、物理和生物学等学科的发展起到巨大推动作用。近年来,精准构筑新型手性功能结构(Nat. Nanotechnol.2020, 15, 192–197)并实现其在多领域的实际应用成为研究重点。例如,手性发光材料具有圆偏振发光特性(circularly polarized luminescence, CPL),在3D显示、自旋电子学、量子计算、信息安全以及生物检测与治疗等领域发挥着重要作用。

传统的3D显示通过线性偏振复用方法实现:分别向左眼与右眼呈现具有偏振状态的图像,为观看者呈现3D效果。然而,由于线偏振光的相互垂直偏振取向,导致相关3D显示技术的观察视角受限、对比度差。具有特殊光学性质的圆偏振光在减少感知失真和提高对比度方面具有巨大潜力,为开发和优化3D显示技术提供可能性。通过将CPL材料印刷在柔性基底表面,可以大规模制造高性能的全彩3D显示面板。然而,目前的CPL材料难以兼具可加工性能和高CPL光学活性,导致基于CPL的柔性3D显示器件尚未实现。

研究人员基于设计的限域螺旋共组装策略,将具有强CPL特性的手性材料前驱体封装到聚合物壳层中,制备了一系列发光颜色可调的CPL光子涂料(CPL-active photonic paints, CPL-PPs,图1)。该类核壳手性结构的最大发光不对称因子(glum,用于评估CPL性能,其理论最大绝对值为2)高达1.6。相关材料的可加工性和高光学性能为后续应用奠定了良好基础。

研究人员利用点胶打印方式,实现了CPL-PPs在多种基底上的图案定制;并通过喷墨打印展示了米级尺度规模的CPL涂布。作者进一步优化打印技术,在柔性基底上精准构筑全彩像素点阵列,构筑了柔性3D显示面板。在制得的面板上,每个像素单元分别由左旋和右旋的红绿蓝三原色像素点组成,能够实现稳定的CPL发射。通过向左眼和右眼呈现具有正交圆偏振状态的不同图像,促使观察者在脑海中形成3D立体显示(图2)。研究人员还提出了将柔性3D显示面板整合到智能手表等可穿戴设备中的概念化设计,以期为虚拟现实、医学成像和科学可视化等领域提供新思路。

审稿人评价称:“这项工作有可能重塑多个行业,并改变人类与视觉信息之间的感知和交互方式。(This work has the potential to reshape multiple industries and transform how we perceive and interact with visual information.)”。该类高性能可打印圆偏振发光结构有望为3D智能交互的实现提供新途径。

中国科学技术大学化学系博士生张铭江与郭启为共同第一作者。我校庄涛涛研究员和俞书宏院士为共同通讯作者。该研究得到了国家重点研发计划、国家自然科学基金、新基石科学基金会等项目的资助支持。
 

SanWenYu

Captain
Registered Member
In Aug we heard news about the first harvest of this unmanned ratooning rice farm which is the first of kind in the world. Now they have had the second harvest of crop production at 411 kg/mu in average. Together with the 788 kg/mu average production from the first harvest, the annual production is 1199 kg/mu in average for the demo farm.

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“再”获丰收!全球首个再生稻无人农场两季产量最高超1200公斤/亩​

11月2日,华中农业大学邀请重庆市农科院、河南省信阳市农科院等单位的专家,对益阳市大通湖区再生稻无人农场示范片的再生季进行了现场测产。

在实割测产前,专家们查看了示范片的生长情况,发现示范片再生稻整体生长平衡,株高穗形均匀,结实率高,落色好,无明显病虫危害,无倒伏。测产结果显示,示范片再生稻再生季平均干谷产量为411.0公斤/亩,加上788.2公斤/亩的头季产量,这意味着示范片再生稻周年两季产量为1199.2公斤/亩。其中超高产品种玮两优8612头季830.7公斤/亩,再生季459.4公斤/亩,周年两季1290.1公斤/亩。

该示范片位于大通湖区千山红镇大西港村宏硕生态农业农机合作社基地,示范面积1118亩,示范品种为玮两优8612和郢香丝苗,采用无人农场技术、数字化栽培技术和再生稻四防一增技术,于3月23日播种、4月16-20日机械抛秧或插秧或穴直播(4月8日),8月10-18日头季成熟收获。根据测产报告,继头季获得丰收后,再生季再获丰收。

国家水稻产业技术体系岗位专家、湖南再生稻省级专家组组长、湖南农业大学二级教授唐启源表示,再生季测产产量,超过出了他在头季收割时对第二季亩产达到350-400公斤的预测。这主要得益于无人农场采用了基于北斗定位的农业机械自动导航作业技术,能减少碾压和损失,均衡留桩高度。特别是无人驾驶收获,除减少作业人工成本、提高作业效率外,利于再生季发苗的整齐度和产量的提高。

一种两收的再生稻生育期短、栽培技术简便,具有省种、省工、省时、省水、省肥等优势,在无人农场技术等先进农业技术的赋能下,再生稻种植效益进一步得到提升。宏硕生态农业农机合作社负责人熊姣军算了一笔账,今年再生稻的“头季+再生季”剔除人工、农资等成本,每亩利润可达600元以上。

据了解,大通湖区再生稻无人农场,系全球首个再生稻无人(少人)智慧农场,由华南农业大学罗锡文院士团队、华中农业大学彭少兵教授团队、湖南农业大学唐启源教授团队,联合大通湖区湖南宏硕生物科技有限公司共同建设,今年初投入使用。该农场同时也是国家水稻产业技术体系岗位专家栽培研究基地,更是 “十四五”国家重点研发计划“长江流域再生稻产能提升和优质高效技术研发与集成示范”项目农机农艺融合课题的核心试验示范基地。

该项目于2022年11月启动,实施周期4年,共5省市的10家单位参与,旨在提升长江流域再生稻产能,促进再生稻产业化。
 

SanWenYu

Captain
Registered Member
In another news, scientists from Huazhong Agricultural University found the genome in rice that controls the "ratooning ability". Knocking out this genome can increase ratoon yield by 23.8%.

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Control of rice ratooning ability by a nucleoredoxin that inhibits histidine kinase dimerization to attenuate cytokinin signaling in axillary bud growth​

Abstract​

Rice ratooning, fast outgrowth of dormant buds on stubble, is an important cropping practice to increase rice yield. However, low ratooning ability (RA) for most rice varieties directly restricts the application of this cost-efficient system, and the genetic basis of RA remains unknown. Here, the genetic architecture of RA was first dissected by a genome-wide association study in a natural rice population. Rice Ratooning Ability 3 (RRA3), encoding an unreported nucleoredoxin involved in reduction of disulfide bonds, was characterized as the causal gene of a major locus controlling RA. Over-expression of RRA3 in rice significantly accelerated leaf senescence and reduced RA, whereas knockout of RRA3 significantly delayed the leaf senescence and improved both RA and ratoon yield. RRA3 was found to interact with Oryza sativa Histidine Kinase 4 (OHK4), a cytokinin receptor, and inhibit the dimerization of OHK4 through disulfide bond reduction. This inhibition ultimately led to decreased cytokinin signaling and reduced RA. In addition, the causal variations in the RRA3 promoter were identified to be associated with RA. Introgression of a superior haplotype with weak expression of RRA3 into the elite rice variety Guichao2 significantly increased RA and ratoon yield by 23.8%. This study not only uncovers an undocumented regulatory mechanism of cytokinin signaling through de-dimerization of histidine kinase receptor, but also provides an eximious gene with promising value in ratoon rice breeding.

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近日,国际学术期刊《分子植物》(Molecular Plant)在线发表了华中农业大学熊立仲教授团队题为“Control of rice ratooning ability by a nucleoredoxin that inhibits histidine kinase dimerization to attenuate cytokinin signaling in axillary bud growth”的研究论文。该团队克隆了全球首个水稻再生力基因RRA3,并揭示了其参与调控水稻再生力的分子机理。
近年来,随着机收再生稻技术的迅速发展,再生稻种植面积逐年扩大,目前,全国再生稻面积大约1500万亩左右。再生力是决定再生季产量最重要的性状之一,但生产上缺乏再生力强的品种,再生季产量低且不稳定等因素严重制约再生稻的进一步发展。目前,关于再生力基因克隆的工作鲜有报道,调控水稻再生力的分子机制尚不清楚。

本研究通过全基因组关联分析(GWAS)鉴定到与多个再生力和再生季产量性状显著关联的候选基因RRA3(Rice Ratooning Ability 3)。盆栽和田间表型实验表明,与野生型黄华占(HHZ)相比,RRA3敲除材料显著提高水稻的再生力和再生季产量,而超表达材料的再生力和再生季产量则显著降低。
此外,RRA3启动子区的变异导致其表达量差异,从而导致再生力的变异。将一个RRA3弱表达的优良单倍型Hap.1导入弱再生力的水稻品种桂朝2号(GC2)中,可使其再生力提高25.0%,再生季产量提高23.8%,表明RRA3优势单倍型在再生稻育种中具有重要应用价值。

综上所述,RRA3可以通过还原CK受体OHK4的二聚化来减弱CK信号转导,影响CK下游响应基因的表达,从而负调控水稻的再生力。该研究对指导水稻强再生力的遗传改良具有重要意义。
 

SanWenYu

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Institute of Advanced Technologies of CAS in Shenzhen created reprogrammable bistable acuators for "multimodal, fast and ultrasensitive grasping". A gripper made with this acuator can react to touch by fish and catch it in 0.18 s.

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Reprogrammable Bistable Actuators for Multimodal, Fast, and Ultrasensitive Grasping​

Abstract:
Leveraging the instability in bistable structures to rapidly release the stored energy is often observed in nature to improve survival and reproduction. Bistable actuators have endowed soft grippers with superior performances such as fast response and self-lock ability. However, current bistable grippers are merely determined by their structural parameters in the design processes, and their grasping modes are usually restricted. In this article, we propose a novel type of reprogrammable bistable actuators. We introduce the design, modeling, and verification of the actuators. The results show that when reprogrammed to its ultrasensitive state with a minimal energy barrier, the trigger force required to induce the fast snap-through can be reduced to less than 0.005 times of its maximum value. In this process, only a minimal energy of 0.001 mJ was needed to trigger the fast energy release of 13.1 mJ. To demonstrate the advances and uniqueness of the proposed actuator, we also prototyped multiple grippers for multimodal, fast, and ultrasensitive grasping. In the ultrasensitive state, the gripper was able to respond to the contact of the swimming fish and capture it in 0.18 s. This work broadens the frontiers of bistable actuators in the design of functional robotic grippers.

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研究提出快速超灵敏抓取的可编程双稳态执行器​

近日,中国科学院深圳先进技术研究院医工所微创中心副研究员李英田课题组,与同济大学、北京邮电大学在《IEEE - ASME机械电子学汇刊》上合作发表最新研究成果。

抓持作为动物和机器人的基本功能,对于捕食和物体操纵具有重要意义。随着软性机器人技术在过去几十年的迅猛发展,软性夹持器由于其较高的柔韧性与适应性,在材料、尺度、驱动方法、结构配置等各个领域得到了广泛应用。然而,大多数软性夹持器在实际应用中速度太慢,在不损害功能的前提下实现高速夹持仍然是一个挑战。

对此,研究团队提出了一种基于折展型可调双稳态结构的可编程双稳态执行器,能够实现抓持器跨尺度地、快速地、多样化地、选择性地抓取。该双稳态执行器可进行编程使其处于稳态与临界态之间的中间态,并且降低能量势垒,当外界施加的触发力,使结构存储的应变能突破能量势垒时,双稳态结构将发生失稳并快速跃变至另一稳态。

与传统的双稳态机构不同,超可调双稳态结构在切换稳态时,采用了一种中间位置的拉动策略。这种设计使得机构可以根据中间位置的高度调节内部能量,并通过微小的外界扰动快速切换到下一个稳态,灵敏度远高于传统双稳态结构。

为了验证可折展型超可调双稳态结构的能力,研究团队进行了一系列实验,结果表明,当重新编程为超灵敏状态并降低最小能量壁垒时,诱发快速切换所需的触发力可以降低到其最大值的0.005倍以下。在此过程中,仅需要0.001毫焦的最小能量,便可触发13.1毫焦的快速能量释放,利用该特性可以实现对不同重量物体的选择性抓取。在水下环境中,超灵敏状态的夹持器能够在0.18秒内对游动的鱼类的接触做出响应并进行捕获。

研究团队设计的可折叠型可编程双稳态执行器颇具潜力,可应用于各个领域,如生产制造、医疗保健、救援任务等。这项技术的发展将推动机器人领域的创新,并提供一个更加高效和精确的抓取解决方案。
 
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