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Cycloaddition of hydrazones and 1,2-diarylalkynes promoted by t-BuOK/DMF:A convenient synthesis of tetraarylpyrazoles

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Chinese Chemical Letters 2019年第2期30卷 395-397页

作者： lang tong Zhifeng Mao Xiangzheng Tang Xuejing Zhang Ming Yan Institute of Drug Synthesis and Pharmaceutical Process School of Pharmaceutical Sciences Sun Yat-sen University

A facile synthesis of tetraarylpyrazoles has been developed via t-BuOK/DMF promoted intermolecular cycloaddition of hydrazones and 1,2-diarylalkynes. A possible reaction pathway via a hydrazone radical is proposed.

关键词： t-BuOK/DMF Tetraarylpyrazole Hydrazone radical Cyclization

Economical Quadrupedal Multi-Gait Locomotion via Gait-Heuristic Reinforcement Learning

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Journal of Bionic Engineering 2024年第4期21卷 1720-1732页

作者： lang Wei Jinzhou Zou Xi Yu Liangyu Liu Jianbin Liao Wei Wang tong Zhang School of Power and Mechanical Engineering Wuhan UniversityLuojiashanWuhan430072HubeiChina State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityLuojiashanWuhan430072HubeiChina

In order to strike a balance between achieving desired velocities and minimizing energy consumption,legged animals have the ability to adopt the appropriate gait pattern and seamlessly transition to another if *** ability makes them more versatile and efficient when traversing natural terrains,and more suitable for long *** the same way,it is meaningful and important for quadruped robots to master this *** achieve this goal,we propose an effective gait-heuristic reinforcement learning framework in which multiple gait locomotion and smooth gait transitions automatically emerge to reach target velocities while minimizing energy *** incorporate a novel trajectory generator with explicit gait information as a memory mechanism into the deep reinforcement learning *** allows the quadruped robot to adopt reliable and distinct gait patterns while benefiting from a warm start provided by the trajectory ***,we investigate the key factors contributing to the emergence of multiple gait *** tested our framework on a closed-chain quadruped robot and demonstrated that the robot can change its gait patterns,such as standing,walking,and trotting,to adopt the most energy-efficient gait at a given ***,we deploy our learned controller to a quadruped robot and demonstrate the energy efficiency and robustness of our method.

关键词： Legged robots Deep reinforcement learning Central pattern generator Quadrupedal gait

Dealloyed TiCuMn efficiently catalyze the NO reduction and Zn-NO batteries

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FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING 2024年第9期18卷 101-0页

作者： Zhang, lang Hou, tong Liu, Weijia Wu, Yeyu Wei, Tianran Ding, Junyang Liu, Qian Luo, Jun Liu, Xijun Guangxi Univ Sch Resources Environm & Mat State Key Lab Featured Met Mat & Life Cycle Safety MOE Key Lab New Proc Technol Nonferrous Met & Mat Nanning 530004 Peoples R China Guangxi Minzu Univ Sch Chem & Chem Engn Key Lab Chem & Engn Forest Prod State Ethn Affairs CommissGuangxi Collaborat Inno Nanning 530006 Peoples R China Tianjin Univ Technol Inst New Energy Mat & Low Carbon Technol Sch Mat Sci & Engn Tianjin 300384 Peoples R China Chengdu Univ Inst Adv Study Chengdu 610106 Peoples R China Univ Elect Sci & Technol China Shenzhen Inst Adv Study ShenSi Lab Shenzhen 518110 Peoples R China

Electrocatalytic NO reduction reaction offers a sustainable route to achieving environmental protection and NH3 production targets as well. In this work, a class of dealloyed Ti60Cu33Mn7 ribbons with enough nanoparticles for the high-efficient NO reduction reaction to NH3 is fabricated, reaching an excellent Faradaic efficiency of 93.2% at -0.5 V vs reversible hydrogen electrode and a high NH3 synthesis rate of 717.4 mu molh(-1)mg(cat).(-1) at -0.6 V vs reversible hydrogen electrode. The formed nanoparticles on the surface of the catalyst could facilitate the exposure of active sites and the transportation of various reactive ions and gases. Meanwhile, the Mn content in the TiCuMn ribbons modulates the chemical and physical properties of its surface, such as modifying the electronic structure of the Cu species, optimizing the adsorption energy of N* atoms, decreasing the strength of the NO adsorption, and eliminating the thermodynamic energy barrier, thus improving the NO reduction reaction catalytic performance. Moreover, a Zn-NO battery was fabricated using the catalyst and Zn plates, generating an NH3 yield of 129.1 mu molh(-1)cm(-2) while offering a peak power density of 1.45 mWcm(-2).

关键词： nitric oxide reduction NH3 electrosynthesis TiCuMn alloy Mn modulation Zn-NO battery NITRIC-OXIDE AMMONIA WATER

Fluorine-doped carbon quantum dots with deep-red emission for hypochlorite determination and cancer cell imaging

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Chinese Chemical Letters 2024年第6期35卷 433-438页

作者： Boran Cheng Lei Cao Chen Li Fang-Yi Huo Qian-Fang Meng Ganglin tong Xuan Wu Lin-Lin Bu lang Rao Shubin Wang Department of Oncology Shenzhen Key Laboratory of Gastrointestinal Cancer Translational ResearchCancer InstitutePeking University Shenzhen HospitalShenzhen-Peking University-Hong Kong University of Science and Technology Medical CenterShenzhen 518036China Institute of Biomedical Health Technology and Engineering Shenzhen Bay LaboratoryShenzhen 518132China The State Key Laboratory Breeding Base of Basic Science of Stomatology(Hubei-MOST)&Key Laboratory of Oral Biomedicine Ministry of Education School&Hospital of StomatologyWuhan UniversityWuhan 430079China

As a type of new carbon-based nanomaterials,carbon dots(CDs)possess exceptional optical properties,making them highly desirable for use in fluorescent ***,the CDs with deep-red(DR)or near-infrared(NIR)emission have rarely been *** this work,we prepared deep-red emissive fluorine-doped carbon quantum dots(F-CDs)by introducing a precursor simultaneously containing fluorine and *** synergistic effect of nitrogen doping and D-π-A pattern production contributed to the maximum emission of F-CDs at 636 nm with an absolute quantum yield of 36.00%±0.68%.Moreover,we designed an F-CDs-based fluorescence assay to determine the content of hypochlorite(ClO^(-)),with a limit of detection(LOD)as low as 15.4 nmol/L,indicating the high sensitivity of F-CDs to ClO^(-).In real samples,the F-CDs-based fluorescent sensor exhibited excellent sensitivity and selectivity in the detection of ClO^(-),with an error below 2%,suggesting their great potential in daily *** cancer cell imaging,the F-CDs not only demonstrated high sensitivity to ClO^(-)but also exhibited excellent mitochondria targeting,as evidenced by the high Pearson's correlation coefficient(PCC)of 0.93 in colocalization *** work presented here suggests the great potential of replacing commercial dyes with F-CDs for highly specific mitochondria labeling and cell imaging.

关键词： Carbon dots Near-infrared Cell imaging Mitochondria labeling Hypochlorite determination

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一种快速精确的连续碰撞检测算法

浙江大学学报（工学版） 2006年第6期40卷 1051-1055页

作者：黄通浪唐敏董金祥浙江大学计算机科学与工程学系浙江杭州310027

为了实现运动刚体间快速精确的碰撞检测,提出了一种新的连续碰撞检测算法。利用图形硬件的计算能力,该算法在每个时间区间上实时处理,把单个时间区间划分成若干个子时间区间,使用静态和连续的定向包围盒(OBB)相交性检测方法,计算出在子... 详细信息

为了实现运动刚体间快速精确的碰撞检测,提出了一种新的连续碰撞检测算法。利用图形硬件的计算能力,该算法在每个时间区间上实时处理,把单个时间区间划分成若干个子时间区间,使用静态和连续的定向包围盒(OBB)相交性检测方法,计算出在子时间区间内的潜在碰撞集(PCS),并结合基于图形硬件的可靠碰撞剔除方法、三角面片之间的碰撞检测方法和回退方法,计算出刚体间的初始碰撞时刻和碰撞位置.并应用于一个三维建模系统中的装配模块.实验结果表明,与传统的碰撞检测方法相比,该算法可以缩短计算时间,具有更好的性能和精度.

关键词：连续碰撞检测刚体硬件加速

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运动图像跟踪过程中丢帧误差消除技术

科学技术与工程 2019年第16期19卷 227-232页

作者：郎晓彤遵义师范学院体育学院

为解决传统方法不能自动对跟踪窗口的大小进行调整,造成跟踪定位误差高,无法有效消除丢帧误差的问题,提出一种新的运动图像跟踪过程中丢帧误差消除方法。通过对帧间差分法进行优化,利用每帧获取的背景部分完成背景模型的更新处理,通过... 详细信息

为解决传统方法不能自动对跟踪窗口的大小进行调整,造成跟踪定位误差高,无法有效消除丢帧误差的问题,提出一种新的运动图像跟踪过程中丢帧误差消除方法。通过对帧间差分法进行优化,利用每帧获取的背景部分完成背景模型的更新处理,通过当前帧和背景模型的差分获取运动范围。利用优化的Mean-shift法对运动图像进行跟踪处理,采用改进的帧差法对目标边缘进行提取,完成Mean-shift搜索窗口的更新处理,自适应调整跟踪窗口大小。通过适于P帧幅度能量模型对此刻帧与上一帧图像信息的改变程度进行描述,以体现运动图像序列运动分布情况,对运动图像跟踪中的丢帧误差情况进行描述。在此基础上求得运动图像跟踪状态矩阵,完成对丢帧状态参数的处理,将丢帧误差消除,以增强运动图像跟踪质量。结果表明,所提方法误差消除效果好,运动图像跟踪精度高。可见该方法能够对丢帧误差进行有效消除。

关键词：运动图像跟踪丢帧误差消除

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中国减贫的历史性成就与中非减贫交流合作

中国非洲学刊 2020年第1期1卷 106-125,159页

作者：童朗中国国际扶贫中心外事处北京100028

经过长达30多年的大规模扶贫开发,中国的减贫事业取得了举世瞩目的历史性成就。作为世界最大的发展中国家和全球发展中国家分布最集中的大陆,中国与非洲之间有着长期的传统友谊和友好合作关系。进入21世纪以来,中非在各领域的交流合作... 详细信息

经过长达30多年的大规模扶贫开发,中国的减贫事业取得了举世瞩目的历史性成就。作为世界最大的发展中国家和全球发展中国家分布最集中的大陆,中国与非洲之间有着长期的传统友谊和友好合作关系。进入21世纪以来,中非在各领域的交流合作日益密切,利益联结也逐步深化。而同时期非洲大陆的反贫困事业却面临着重重困难,减贫进程明显滞后于世界其他地区。对于面临严重贫困问题和巨大减贫压力的非洲国家而言,可有选择地借鉴与分享中国大规模减贫的经验,破解发展难题,弥补减贫短板。中非之间在减贫领域开展交流合作的重要性日益凸显,这在客观上也为新时期中非全面战略合作伙伴关系的建设提供了新的历史机遇。

关键词：中非减贫合作中国经验非洲贫困扶贫开发能力建设