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Time-dependent wave packet approach to the pulse delay effect upon RbI photoelectron spectrum

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Science China Chemistry 2006年第3期49卷 214-218页

作者： LIU Chunhua MENG qingtian zhang Qinggang College of Physics and Electronics Shandong Normal University Jinan 250014 China College of Physics and Electronics Shandong Normal University Jinan 250014 China College of Physics and Electronics Shandong Normal University Jinan 250014 China

The time-resolved photoelectron spectrum (TRPES) of Rbl molecule is simulatedusing the time-dependent wave-packet method. Both the normal three-photon ionization process andauto-ionization process are involved in the simulation. The calculated results show that the changeof delay time will influence the shape of the photoelectron spectrum (PES), and the influence issubstantially due to the existence of the crossing between excited states and the strong laser fieldwhich will change the position of relevant curves.

关键词： time-dependent wave packet method, multiphoton ionization (MPI), time-resolved photoelectron spectrum (TRPES), auto-ionization.

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Preparation of Nitrogen-doped Carbon Dots from Coke Powder as a Fluorescent Chemosensor for Selective and Sensitive Detection of Cr (Ⅵ)

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1096-1104页

作者： MENG Juan LI Shiqian DING Ling ZHOU Chuang JIANG Rui zhang qingtian CHENG Zhengzai GAUTHIER Mario HU Ya WU Lin School of Chemistry and Chemical Engineering Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel makingWuhan University of Science and TechnologyWuhan 430081China Fujian Universities and Colleges Engineering Research Center of Modern Facility Agriculture of Fujian University Fujian Polytechnic Normal UniversityFuqing 350300China Chemistry Department University of WaterlooWaterlooOntarioN2L 3G1Canada

The nitrogen-doped carbon dots(N-CDs)were prepared by using coke powder as carbon source and one-step hydrothermal *** N-CDs were studied as a fluorescent chemosensor for determining Cr(Ⅵ)in *** selective,sensitive,reproducibility and stability of as-prepared N-CDs were *** morphology,composition and properties of N-CDs were characterized by a series of *** fluorescence quenching of N-CDs by Cr(Ⅵ)was *** experimental results reveal that the obtained N-CDs have great hydrophilicity and strong luminescence properties,which demonstrates the successful doping of nitrogen into the *** surface-active groups and emission wavelength range of CDs increase due to the electronegativity and electron donor effect of doping N ***,the N-CDs exhibit good photochemical properties for the detection of Cr(Ⅵ),including a wide linear range from 0.3 to 200μM(R^(2)=0.9935)and a low detection limit of 0.10μM at the signal-to-noise ratio of 3(S/N=3).Moreover,the N-CDs as a sensor was used successfully for Cr(Ⅵ)detection in real water samples with recovery rates of 99.9%-110.6%.This sensor also shows highly reproducibility and *** N-CDs fluorescent chemical sensor may be a potential candidate for applying in the field of other fluorescent chemical sensing,catalysis,photoelectric devices and other fields.

关键词： carbon dots nitrogen doping preparation fluorescence detection Cr(Ⅵ)

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CLEAR: a full-stack chip-in-loop emulator for analog RRAM based computing-in-memory system

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Science China(Information Sciences) 2023年第12期66卷 293-294页

作者： Ruihua YU Wenqiang zhang Bin GAO Yiwen GENG Peng YAO Yuyi LIU qingtian zhang Jianshi TANG Dong WU Hu HE Ning DENG He QIAN Huaqiang WU School of Integrated Circuits Beijing National Research Center for Information Science and Technology(BNRist)Tsinghua University

Deep neural networks(DNNs) have undergone tremendous advancement in several practical applications, such as object detection and text generation, over the last few years,leading to a huge demand for increased computing efficiency of hardware. Resistive random-access memory(RRAM)-based computing-in-memory(CIM) chip has been investigated as a promising candidate to reduce the requirement for memory bandwidth [1].

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Gate-tunable large-scale flexible monolayer MoS_(2)devices for photodetectors and optoelectronic synapses

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Nano Research 2022年第6期15卷 5418-5424页

作者： Na Li Congli He Qinqin Wang Jianshi Tang qingtian zhang Cheng Shen Jian Tang Heyi Huang Shuopei Wang Jiawei Li Biying Huang Zheng Wei Yutuo Guo Jiahao Yuan Wei Yang Rong Yang Dongxia Shi Guangyu zhang Songshan Lake Materials Laboratory Dongguan 523808China Beijing National Laboratory for Condensed Matter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China School of Integrated Circuits Beijing Innovation Center for Future Chips(ICFC)Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084China Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China

Photodetectors and optoelectronic synapses are vital for construction of artificial visual perception ***,the hardware implementations of optoelectronic-neuromorphic devices based on conventional architecture usually suffer from poor scalability,light response range,and limited ***,large-scale flexible monolayer MoS_(2)devices integrating photodetectors and optoelectronic synapses over the entire visible spectrum in one device have been realized,which can be used in photodetection,optical communication,artificial visual perception system,and optical artificial neural *** modulating gate voltages,we enable MoS_(2)-based devices to be photodetectors and also optoelectronic ***,the MoS_(2)-based optoelectronic synapses could implement many synaptic functions and neuromorphic characteristics,such as short-term memory(STM),long-term memory(LTM),paired-pulse facilitation(PPF),long-term potentiation(LTP)/long-term depression(LTD),and“learning-experience”***,an associative learning behavior(the classical conditioning Pavlov’s dog experiment)was emulated using paired stimulation of optical and voltage *** results facilitate the development of MoS_(2)-based multifunctional optoelectronic devices with a simple device structure,showing great potential for photodetection,optoelectronic neuromorphic computing,human visual systems mimicking,as well as wearable and implantable electronics.

关键词： MoS_(2) flexible devices gate-tunable photodetector optoelectronic synapse

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海水海砂再生混凝土受压动力本构模型

建筑材料学报 2024年第7期27卷 580-588,610页

作者：张青天张凯建福州大学土木工程学院福建福州350116

考虑贝壳含量、龄期等因素,对不同加载应变率下的海水海砂再生混凝土(SSRAC)试件开展了单轴受压应力-应变曲线试验.结果表明:600 d时,与普通混凝土(NAC)相比,SSRAC峰值应力和峰值应变分别提高了10.4%、23.2%,弹性模量降低了29.1%;当掺... 详细信息

考虑贝壳含量、龄期等因素,对不同加载应变率下的海水海砂再生混凝土(SSRAC)试件开展了单轴受压应力-应变曲线试验.结果表明:600 d时,与普通混凝土(NAC)相比,SSRAC峰值应力和峰值应变分别提高了10.4%、23.2%,弹性模量降低了29.1%;当掺入贝壳颗粒后,SSRAC应变率敏感性增加;结合试验以及文献数据,基于GB50010模型,考虑不同应变率下特征参数的动态增大系数,提出了适用于中低应变率(10^(-5)~10^(-1) s^(-1))下SSRAC受压动力本构模型,并对其曲线特征进行了机理解释.

关键词：再生混凝土海水海砂单轴受压应力-应变曲线应变率动态增大系数

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Strawberry Root Diseases and Control Measures

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Plant Diseases and Pests 2020年第1期11卷 10-12页

作者： Wu Chong zhang Rong Han Zhen zhang qingtian Shandong Institute of Pomology Tai'an 271000China Forestry Bureau of Daiyue District Tai'an 271000China

With the development of strawberry protected cultivation industry, continuous cropping of strawberry is becoming more and more com-mon, and soil-borne diseases are increasingly severe. The paper introduces damage symptoms, pathogenic bacteria and transmission mode of several main root diseases of strawberry, including Verticillium wilt, Fusarium wilt, root rot and bacterial wilt, and put forward corresponding prevention and control measures.

关键词： Strawberry Root diseases Damage symptoms Pathogen Control measures

Study on the Culture Conditions for Hairy Roots of Aconitum coreanum( Levl.) Raipaics

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Agricultural Biotechnology 2015年第2期4卷 1-4页

作者： Lili LIU Jun AI qingtian zhang Changyu LI Institute of Special Economic Animal and Plant Sciences Chinese Academy of Agricultural Sciences

[Objective]This study aimed to investigate the culture conditions for hairy roots of Aconitum coreanum（Levl.）Raipaics and optimize the amplification culture conditions in bioreactors,thus providing basis for large-scale production of *** hairy roots.[Method]The effects of different p H,culture modes and culture vessels on the growth of hairy roots were compared to obtain the optimal culture conditions for *** hairy ***,the effects of medium volume and inoculation mode on bioreactor culture of *** hairy roots were investigated to analyze the feasibility of amplification culture of hairy roots in bioreactors.[Result]After autoclaving,medium p H was reduced slightly and the clarity of medium *** be specific,*** hairy roots cultured in medium at p H 5.80 exhibited the best *** hairy roots cultured in liquid medium displayed more rapid growth than hairy roots cultured in solid *** p H and electrical conductivity（EC）varied with the extension of culture *** yield and propagation coefficient of *** hairy roots were positively correlated with the size of culture *** growth of hairy roots cultured in bioreactors were influenced by medium volumes and inoculation modes.[Conclusion]The growth of *** hairy roots were significantly influenced by medium p H,culture modes and culture *** hairy roots cultured in bioreactors exhibited high yield and large propagation *** to the results,the relationship between ventilation volume and hairy root density is crucial to the amplification culture of *** hairy roots.

关键词： roots Roots Aconitum varied displayed bioreactor inoculation cultured cultivated inoculated

Anthocyanin Biosynthesis Gene Analysis of Lonicera caerulea L. by RNA-seq and DGE

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Agricultural Biotechnology 2019年第1期8卷 10-12,16页

作者： qingtian zhang Changyu LI Shutian FAN Yiming YANG Jun AI Shandong Institute of Pomology Institute of Special Animal and Plant sciences Chinese Academy of Agricultural Sciences

Fruit of Lonicera caerulea L. is a rich source of phenolic compounds such as phenolic acids as well as anthocyanins,proanthocyanidins and other flavonoids,which display potential health-promoting effects. However,its genetics and genomic information is limited. Transcriptome and digital gene expression( DGE) profiles of fruit at four different development stages were compared. Related genes with anthocyanin biosynthesis were compared using real-time quantitative PCR( qRT-PCR). RNA-Seq generated 6. 26-Gb clean reads,which was then de novo assembled into 45,656 UniG enes with a mean length 837 bp. A total of 7 928 unigenes were annotated into 32 known metabolic or signaling pathways in which a few primary,intermediate,and secondary metabolic pathways are directly related to fruit quality. The result of DGE and qRT-PCR indicates that UFGT( comp20132_c0) may play a key role in honeysuckle coloration. This provides a reference for the study of complicated metabolism in non-model perennial species.

关键词： Lonicera caerulea L. RNA-Seq DGE Transcriptome

Application of mathematical morphology operation with memristor-based computation-in-memory architecture for detecting manufacturing defects

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Fundamental Research 2022年第1期2卷 123-130页

作者： Ying Zhou Bin Gao qingtian zhang Peng Yao Yiwen Geng Xinyi Li Wen Sun Meiran Zhao Yue Xi Jianshi Tang He Qian Huaqiang Wu School of Integrated Circuits(SIC) Beijing Innovation Center for Future Chips(ICFC)Tsingfiua UniversityBeijingChina Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijingChina

Mathematical morphology operations are widely used in image processing such as defect analysis in semiconductor manufacturing and medical image *** data-intensive applications have high requirements during hardware implementation that are challenging for conventional hardware platforms such as central processing units(CPUs)and graphics processing units(GPUs).Computation-in-memory(CIM)provides a possible solution for highly efficient morphology *** this study,we demonstrate the application of morphology operation with a novel memristor-based auto-detection architecture and demonstrate non-neuromoq)hic computation on a multi-array-based memristor ***-by-pixel logic computations with low parallelism are converted to parallel operations using ***,hardware-implemented computer-integrated manufacturing was used to experimentally demonstrate typical defect detection tasks in integrated circuit(IC)manufacturing and medical image *** addition,we developed a new implementation scheme employing a four-layer network to realize small-object detection with high *** system benchmark based on the hardware measurement results showed significant improvement in the energy efficiency by approximately 358 times and 32 times more than when a CPU and GPU were employed,respectively,exhibiting the advantage of the proposed memristor-based morphology operation.

关键词： Memristor Computation-in-memory Mathematical morphology Defect detection