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2D materials for intelligent devices

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 44-54页

作者： xuan pan Yixiang Li Bin Cheng Shi-Jun Liang Feng Miao Institute of Brain-Inspired Intelligence National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of PhysicsNanjing UniversityNanjing210093China Institute of Interdisciplinary Physical Sciences School of ScienceNanjing University of Science and TechnologyNanjing210094China

Neuromorphic intelligent hardware technologies have undergone rapid advancement during the past decade,with the goal of building intelligent devices and systems capable of overcoming challenges associated with conventional hardware.Realization of neuromorphic intelligent hardware depends on major advances in materials science,condensed matter physics,device physics and engineering.As a revolutionary discovery,two-dimensional(2D)materials with atomically-thin thickness and exceptionally high tunability introduce a new physical paradigm and show great promise in the development of intelligent devices.Here,we give prominence to three categories of tunable properties(i.e.,charge carrier,band structure,lattice structure)that are inherent for 2D materials and review their superiorities in constructing intelligent devices particularly in electronics and optoelectronics.Furthermore,we provide insight into how the unique physical mechanisms emerging in 2D materials offer a fertile ground for the design of diverse intelligence devices.

关键词： tunability 2D materials intelligent devices

Observation of resistive switching in a graphite/hexagonal boron nitride/graphite heterostructure memristor

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Journal of Semiconductors 2022年第5期43卷 84-88页

作者： Yafeng Deng Yixiang Li Pengfei Wang Shuang Wang xuan pan Dong Wang Mechanical&Electrical Engineering College of Henan Agricultural University Zhengzhou 450002China Institute of Brain-Inspired Intelligence National Laboratory of Solid State MicrostructuresSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

With the atomically sharp interface and stable switching channel, van der Waals(vdW) heterostructure memristors have attracted extensive interests for the application of high-density memory and neuromorphic computing. Here, we demonstrate a new type of vdW heterostructure memristor device by sandwiching a single-crystalline h-BN layer between two thin graphites. In such a device, a stable bipolar resistive switching(RS) behavior has been observed for the first time. We also characterize their switching performance, and observe an on/off ratio of >10^(3) and a minimum RESET voltage variation coefficient of3.81%. Our work underscores the potential of 2D materials and vdW heterostructures for emerging memory and neuromorphic applications.

关键词： hexagonal boron nitride van der Waals heterostructure memristor

SK channels modulate the excitability and firing precision of projection neurons in the robust nucleus of the arcopallium in adult male zebra finches

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Neuroscience Bulletin 2012年第3期28卷 271-281页

作者： Guo-Qiang Hou xuan pan Cong-Shu Liao Song-Hua Wang Dong-Feng Li School of Life Science South China Normal UniversityKey Laboratory of Ecology and Environmental Science in Higher Education of Guangdong ProvinceGuangzhou 510631China

Objective Motor control is encoded by neuronal activity. Small conductance Ca2＋-activated K＋ channels （SK channels） maintain the regularity and precision of firing by contributing to the afterhyperpolarization （AHP） of the action potential in mammals. However, it is not clear how SK channels regulate the output of the vocal motor system in songbirds. The premotor robust nucleus of the arcopallium （RA） in the zebra finch is responsible for the output of song information. The temporal pattern of spike bursts in RA projection neurons is associated with the timing of the acoustic features of birdsong. Methods The firing properties of RA projection neurons were analyzed using patch clamp whole-cell and cell-attached recording techniques. Results SK channel blockade by apamin decreased the AHP amplitude and increased the evoked firing rate in RA projection neurons. It also caused reductions in the regularity and precision of firing. RA projection neurons displayed regular spontaneous action potentials, while apamin caused irregular spontaneous firing but had no effect on the firing rate. In the absence of synaptic inputs, RA projection neurons still had spontaneous firing, and apamin had an evident effect on the firing rate, but caused no significant change in the firing regularity, compared with apamin application in the presence of synaptic inputs. Conclusion SK channels contribute to the maintenance of firing regularity in RA projection neurons which requires synaptic activity, and consequently ensures the precision of song encoding.

关键词： SK channels excitability firing precision robust nucleus of the arcopallium zebra finches

考虑阶梯碳交易与绿证交易的综合能源系统优化调度

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化学工程 2024年第3期52卷 19-23,29页

作者：杨博李洋张喆刘若溪潘轩薛小军国家电网北京电力科学研究院北京100192 国网北京市电力公司北京100031 国网信息通信产业集团有限公司北京102211 华北电力大学能源动力与机械工程学院北京102206

为减小综合能源系统的碳排放量以及提高可再生能源消纳能力,提出考虑阶梯碳交易机制与绿证交易机制的综合能源系统绿色调度模型。首先介绍了阶梯碳交易机制与绿证交易机制,并建立其数学计算模型,同时引入可再生能源电力消纳责任权重对... 详细信息

为减小综合能源系统的碳排放量以及提高可再生能源消纳能力,提出考虑阶梯碳交易机制与绿证交易机制的综合能源系统绿色调度模型。首先介绍了阶梯碳交易机制与绿证交易机制,并建立其数学计算模型,同时引入可再生能源电力消纳责任权重对绿证交易进行约束;其次以系统的运行维护成本、投资成本、碳交易成本以及绿证收益之和最大为目标分析两机制对系统的影响;最后分析不同碳交易机制参数与绿证参数对系统的影响。结果表明:综合能源系统中考虑碳交易机制与绿证交易机制具有较高的经济性,同时可以有效减小系统的碳排放量,提高了可再生能源的消纳量。

关键词：综合能源系统阶梯碳交易绿证交易消纳责任权重

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电网单相断线故障类型及电压特征

安徽电气工程职业技术学院学报 2024年第1期29卷 59-68页

作者：李斌曾子琪潘轩国网湖南省电力有限公司娄底供电公司湖南娄底417000

断线故障包括断线不接地、断线电源端接地、断线负荷端接地等。而断线故障类型、位置、系统中性点接地方式等均会影响系统电压幅值和相位等电气量特征。为挖掘各种断线故障在不同情景下的电压特征,系统地归纳和总结了单相断线故障类型,... 详细信息

断线故障包括断线不接地、断线电源端接地、断线负荷端接地等。而断线故障类型、位置、系统中性点接地方式等均会影响系统电压幅值和相位等电气量特征。为挖掘各种断线故障在不同情景下的电压特征,系统地归纳和总结了单相断线故障类型,分析了不同断线故障下中性点可能的移动范围及断线后断口两端电压变化特征,运用对称分量法推导了110 kV断线时,负荷侧35 kV、10 kV母线电压特征,对断线故障定位、电网故障判别与处置具有现实意义。

关键词：单相断线中性点偏移断线接地电压不平衡故障判别

New Diterpenoid Alkaloids from Delphinium Souliei Franch

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Chinese Chemical Letters 1999年第5期10卷 395-396页

作者： Lan HE Yuan Jiang pan xuan pan Bo Gang LI Yao Zu CHEN(Department of Chemistry. Beijing Normal University. Beijing 100085 Department of Chemistry. Zhejiang University. Hangzhou 310027Department of Pharmcy. Lanzhou Medical College. Lanzhou 730000The Che Department of Chemistry Beijing Normal University Beijing 100085 China Department of Chemistry Zhejiang University Hangzhou 310027 China Department of Pharmcy Lanzhou Medical College Lanzhou 730000 China Chengdu Institute of Biology Chinese Academy of Sciences Chengdu 610041 China

Continuing investigation of Delphinium souliei Franch yielded two minor new diterpenoid alkaloids--souline E(1) and souline F(2), their structures were determined on the basis of spectroscopic evidences.

关键词： Delphinium souliei new deterpenoid alkaloids souline E and F spectral data

Intrinsic polarization coupling in 2Dα‐In_(2)Se_(3)toward artificial synapse with multimode operations

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SmartMat 2021年第1期2卷 88-98页

作者： Jing Gao Yue Zheng Wei Yu Yanan Wang Tengyu Jin xuan pan Kian Ping Loh Wei Chen Department of Physics National University of SingaporeSingaporeSingapore Department of Chemistry National University of SingaporeSingaporeSingapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhouChina National University of Singapore(Suzhou)Research Institute SuzhouChina

Emulation of advanced synaptic functions of the human brain with electronic devices contributes an important step toward constructing high‐efficiency neuromorphic systems.Ferroelectric materials are promising candidates as synaptic weight elements in neural network hardware due to their controllable polarization states.However,the increased depolarization field at the na-noscale and the complex fabrication process of the traditional ferroelectric materials hamper the development of high‐density,low‐power,and highly sensitive synaptic devices.Here,we report the implementation of two‐dimensional(2D)ferroelectricα‐In_(2)Se_(3)as an active channel material to emulate typical synaptic functions.Theα‐In_(2)Se_(3)‐based synaptic device fea-tures multimode operations,enabled by the coupled ferroelectric polarization under various voltage pulses applied at both drain and gate terminals.Moreover,the energy consumption can be reduced to~1 pJ by using high‐κdielectric(Al2O3).The successful control of ferroelectric polarizations inα‐In_(2)Se_(3)and its application in artificial synapses are expected to inspire the implementation of 2D ferroelectric materials for future neuromorphic systems.

关键词： 2D ferroelectrics artificial synapse high‐κdielectric multimode operations α‐In_(2)Se_(3)

Band-tailored van der Waals heterostructure for multilevel memory and artificial synapse

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InfoMat 2021年第8期3卷 917-928页

作者： Yanan Wang Yue Zheng Jing Gao Tengyu Jin Enlong Li Xu Lian xuan pan Cheng Han Huipeng Chen Wei Chen Department of Physics National University of SingaporeSingaporeSingapore SZU-NUS Collaborative Innovation Center for Optoelectronic Science and Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhenChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhouChina National and Local United Engineering Lab of Flat panel Display Technology Institute of Optoelectronic DisplayFuzhou UniversityFuzhouChina Department of Chemistry National University of SingaporeSingaporeSingapore National University of Singapore(Suzhou)Research Institute SuzhouChina

Two-dimensional(2D)van der Waals heterostructure(vdWH)-based floating gate devices show great potential for next-generation nonvolatile and multilevel data storage memory.However,high program voltage induced substantial energy consumption,which is one of the primary concerns,hinders their applications in lowenergy-consumption artificial synapses for neuromorphic computing.In this study,we demonstrate a three-terminal floating gate device based on the vdWH of tin disulfide(SnS2),hexagonal boron nitride(h-BN),and few-layer graphene.The large electron affinity of SnS2 facilitates a significant reduction in the program voltage of the device by lowering the hole-injection barrier across h-BN.Our floating gate device,as a nonvolatile multilevel electronic memory,exhibits large on/off current ratio(105),good retention(over 104 s),and robust endurance(over 1000 cycles).Moreover,it can function as an artificial synapse to emulate basic synaptic functions.Further,low energy consumption down to7 picojoule(pJ)can be achieved owing to the small program voltage.High linearity(<1)and conductance ratio(80)in long-term potentiation and depression(LTP/LTD)further contribute to the high pattern recognition accuracy(90%)in artificial neural network simulation.The proposed device with attentive band engineering can promote the future development of energy-efficient memory and neuromorphic devices.

关键词： artificial synapse band engineering three-terminal floating gate memory tin disulfide van der Waals heterostructure

Progress in immunotherapy for neuroendocrine neoplasm of the digestive system

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World Journal of Gastroenterology 2023年第26期29卷 4174-4185页

作者： Wei-xuan pan Xin-Mu Zhang Shao-Long Hao Wei Han Department of General Surgery Beijing Luhe HospitalCapital Medical UniversityBeijing 101100China Department of Liver Surgery State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China

Neuroendocrine neoplasms(NENs)are rare heterogeneous tumors that can develop in almost any organ,with the digestive organs,including the gastrointestinal tract and pancreas being the most commonly affected sites.Despite the fact that advances in initial therapies have progressed,there is presently no recognized effective treatment for advanced NEN.Immune checkpoint inhibitors(ICIs)have shown superior efficacy in treating several types of solid tumors.Despite their successful role in the treatment of partial NENs,such as small cell lung cancer,and Merkel cell carcinoma,the role of ICIs in most of the NENs remains limited.Nevertheless,due to their specific anti-tumor mechanisms and acceptable safety profile,ICIs are a promising avenue for further study in NENs therapy.Recent clinical trials have illustrated that combination therapy with ICI is more efficient than monotherapy,and multiple clinical trials are constantly ongoing to evaluate the efficacy and safety of these combination therapies.Therefore,the purpose of this review is to provide a comprehensive summary of the clinical progress of immunotherapy in NENs affecting the digestive system,with a specific emphasis on the application of programmed cell death protein 1/programmed death receptor ligand 1 inhibitor.Furthermore,this review has an exploration of the potential beneficiary population and the inherent value of utilizing immunotherapy in the management of NENs.

关键词： Immunotherapy PD-1 inhibitor Neuroendocrine neoplasm Neuroendocrine tumor Neuroendocrine carcinoma Gastrointestinal pancreatic