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Designing cancer nanodrugs that are highly loaded,pH-responsive,photothermal, and possess a favored morphology:A hierarchical assembly of DOX and layer-by-layer modified rGO

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Chinese Chemical Letters 2019年第2期30卷 489-493页

作者： Xiangming Li Yihe Zhang zequn ma Chengjun He Yaling Wu Qi An Beijing Key Laboratory of materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Sciences and Technology China University of Geosciences Beijing Zhendong Guangming Pharmaceutical Research Institute Co. Ltd.

An effective cancer nanodrug not only needs to load a large fraction of pharmaceutical molecules and release them in responsive ways, to function as imaging and photothermal agents, but also needs to possess the favorable morphologies that are favored by the EPR effect of cancer tissues. In this study, we designed a spherical nanodrug by forming clusters using DOX and a polymer-engineered rGO. These spherical nanodrugs had a diameter of around 750 nm and assumed both functionalities of chemical therapy and the photothermal effect. In addition, this nanodrug featured a high-loading capability of DOX, a pH-responsive release profile, a self-fluorescent capability, and an effective accumulation in cancer cells. The layer-by-layer assembly of three cycles of polyethylene glycol (PEG) and polyacrylic acid (PAA) around the rGO core was indispensable in achieving a chemically-modified rGO precursor that assembled with DOX to produce the spherical nanodrug. The spherical nanodrug effectively decreased cell viability upon NIR irradiations.

关键词： Graphene oxide Polyethylene glycol Polyacrylic acid Hydrogen bonds pH-Responsive

计及马尔科夫链的能源社区产消者贝叶斯博弈策略

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智慧电力 2024年第3期52卷 39-46,79页

作者：张虹孙书朋李亚洲孟庆尧马泽群刘旭现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学) 吉林吉林132012 国网承德供电公司河北承德067000 大唐吉林发电有限公司长春第三热电分公司吉林长春130103 国网永康供电公司浙江永康321300

随着电力系统用户侧能源转型比例的不断提高,传统的社区用电居民逐步向着能源社区产消者转变,并通过能源交易的方式来促进分布式能源就地消纳。在此背景下,通过构建贝叶斯博弈能源交易模型,实现能源社区产消者之间的自主能源交易。首先... 详细信息

随着电力系统用户侧能源转型比例的不断提高,传统的社区用电居民逐步向着能源社区产消者转变,并通过能源交易的方式来促进分布式能源就地消纳。在此背景下,通过构建贝叶斯博弈能源交易模型,实现能源社区产消者之间的自主能源交易。首先,针对交易过程中产消者交易身份的不确定性问题,采用马尔科夫链对其身份状态概率进行分析。然后,将概率分布作为先验概率,建立能源社区产消者能源交易的贝叶斯博弈模型,对产消者之间的能源交易过程进行优化。最后,通过算例验证了所提模型在保证产消者隐私性的同时提高了其自身的收益。

关键词：产消者马尔科夫链交易身份不确定性贝叶斯博弈

Corrosion engineering on AlCoCrFeNi high-entropy alloys toward highly efficient electrocatalysts for the oxygen evolution of alkaline seawater

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矿物冶金与材料学报:英文版 2023年第10期30卷 1922-1932页

作者： Zhibin Chen Kang Huang Bowei Zhang Jiuyang Xia Junsheng Wu zequn Zhang Yizhong Huang Institute for Advanced materials and Technology University of Science and Technology BeijingBeijing 100083China School of materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

Seawater splitting is a prospective approach to yield renewable and sustainable hydrogen energy.Complex preparation processes and poor repeatability are currently considered to be an insuperable impediment to the promotion of the large-scale production and application of electrocatalysts.Avoiding the use of intricate instruments,corrosion engineering is an intriguing strategy to reduce the cost and presents considerable potential for electrodes with catalytic performance.An anode comprising quinary AlCoCrFeNi layered double hydroxides uniformly decorated on an AlCoCrFeNi high-entropy alloy is proposed in this paper via a one-step corrosion engineering method,which directly serves as a remarkably active catalyst for boosting the oxygen evolution reaction(OER)in alkaline seawater.Notably,the best-performing catalyst exhibited oxygen evolution reaction activity with overpotential values of 272.3 and 332 mV to achieve the current densities of 10 and100 ma·cm^(-2),respectively.The failure mechanism of the obtained catalyst was identified for advancing the development of multicomponent catalysts.

关键词： corrosion engineering oxygen evolution reaction catalysts layered double hydroxides seawater splitting failure mechanism

Program Error Mitigation in MLC NAND Flash Memory with Soft Decision Decoders

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China Communications 2021年第4期18卷 76-87页

作者： zequn Fang Zheng ma Xiaohu Tang Yue Xiao Youhua Tang School of Information Science and Technology Southwest Jiaotong UniversityChengdu 610031China National Engineering Laboratory for integrated traffic data application technology Southwest Jiaotong UniversityChengdu 610031China

Benefiting from strong decoding capabilities,soft-decision decoding has been used to replace hard-decision decoding in various communication systems,and NAND flash memory systems are no exception.However,soft-decision decoding relies heavily on accurate soft information.Owing to the incremental step pulse programming(ISPP),program errors(PEs)in multi-level cell(MLC)NAND flash memory have different characteristics compared to other types of errors,which is very difficult to obtain such accurate soft information.Therefore,the characteristics of the log-likelihood ratio(LLR)of PEs are investigated first in this paper.Accordingly,a PE-aware statistical method is proposed to determine the usage of PE mitigation schemes.In order to reduce the PE estimating workload of the controller,an adaptive blind clipping(ABC)scheme is proposed subsequently to approximate the PEs contaminated LLR with different decoding trials.Finally,simulation results demonstrate that(1)the proposed PE-aware statistical method is effective in practice,and(2)ABC scheme is able to provide satisfactory bit error rate(BER)and frame error rate(FER)performance in a penalty of negligible increasing of decoding latency.

关键词： program errors soft-decision decoder NAND flash memory clipping approximation

Self-assembled interlayer aiming at the stability of NiOx based perovskite solar cells

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Journal of Energy Chemistry 2022年第6期31卷 211-220,I0006页

作者： Tonghui Guo Zhi Fang zequn Zhang Zhiqiang Deng Rui Zhao Jing Zhang Minghui Shang Xiaohui Liu Ziyang Hu Yuejin Zhu Liyuan Han Department of Microelectronic Science and Engineering Ningbo UniversityNingbo 315211ZhejiangChina School of materials Science and Engineering Ningbo University of TechnologyNingbo 315016ZhejiangChina State Key Laboratory of Metal matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China

Inorganic NiO_(x) based inverted structure perovskite solar cells (PSCs) is reported to be more stable than that with the organic hole transport materials.In this work,NiO_(x)/maPbI_(3) interface chemical reaction induced instability of perovskite is unveiled:Ni^(3+) and I^(-) exhibit redox reactions and deprotonation of ma^(+) happens,which result in interface defects and perovskite lattice deformation.Thus the defective interface accelerates the degradation of perovskite by defect pathways from the bottom interface to the perovskite surface contacting H_(2)O/O_(2).Self-assembled interlayer of NH_(2)^(-)end silane on NiO_(x)separates the reactive NiO_(x)and maPbI_(3),tunes the interface energy states by–NH_(2) end group.As a result,the PSC based on the silane treated NiO_(x)achieves enhanced PCE of 20.1%with decent stability under environmental and extreme conditions (high temperature,high humidity,light infiltration).Our work highlights the interface chemical problem induced PSC instability and a simple interface modification to achieve the stable PSCs.

关键词： Perovskite solar cells Interface chemical problem NiOx hole transport material Self assemble Stability

Electrically programmable phase-change photonic memory for optical neural networks with nanoseconds in situ training capability

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Advanced Photonics 2023年第4期5卷 42-50页

作者： maoliang Wei Junying Li zequn Chen Bo Tang Zhiqi Jia Peng Zhang Kunhao Lei Kai Xu Jianghong Wu Chuyu Zhong Hui ma Yuting Ye Jialing Jian Chunlei Sun Ruonan Liu Ying Sun Wei.E.I.Sha Xiaoyong Hu Jianyi Yang Lan Li Hongtao Lin Zhejiang University College of Information Science and Electronic EngineeringState Key Laboratory of Modern Optical InstrumentationKey Laboratory of Micro-Nano Electronics and Smart System of Zhejiang ProvinceHangzhouChina Westlake University School of EngineeringKey Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang ProvinceHangzhouChina Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhouChina Institute of Microelectronics of the Chinese Academy of Sciences BeijingChina Peking University School of PhysicsFrontiers Science Center for Nano-optoelectronicsState Key Laboratory for Mesoscopic PhysicsBeijingChina

Optical neural networks (ONNs), enabling low latency and high parallel data processing withoutelectromagnetic interference, have become a viable player for fast and energy-efficient processing andcalculation to meet the increasing demand for hash rate. Photonic memories employing nonvolatile phase-change materials could achieve zero static power consumption, low thermal cross talk, large-scale, andhigh-energy-efficient photonic neural networks. Nevertheless, the switching speed and dynamic energyconsumption of phase-change material-based photonic memories make them inapplicable for in situ training.Here, by integrating a patch of phase change thin film with a PIN-diode-embedded microring resonator,a bifunctional photonic memory enabling both 5-bit storage and nanoseconds volatile modulation wasdemonstrated. For the first time, a concept is presented for electrically programmable phase-changematerial-driven photonic memory integrated with nanosecond modulation to allow fast in situ training and zerostatic power consumption data processing in ONNs. ONNs with an optical convolution kernel constructedby our photonic memory theoretically achieved an accuracy of predictions higher than 95% when testedby the MNIST handwritten digit database. This provides a feasible solution to constructing large-scalenonvolatile ONNs with high-speed in situ training capability.

关键词： phase-change materials optical neural networks photonic memory silicon photonics reconfigurable photonics

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考虑LDPC码字的NAND闪存信道量化

中国科学：信息科学 2022年第8期52卷 1542-1559页

作者：方泽群马征周璇庞琦珂西南交通大学信息科学与技术学院信息编码与传输四川省重点实验室成都610031

随着尺寸工艺的提升和存储方法的演进,NAND闪存芯片的存储密度正在一步步提高.而存储密度的提高带来了芯片物理容错性能的下降,从而导致器件的寿命下降.如何保证NAND闪存的使用寿命是目前闪存器件的研究热点问题.纠错编码的软判决译码... 详细信息

随着尺寸工艺的提升和存储方法的演进,NAND闪存芯片的存储密度正在一步步提高.而存储密度的提高带来了芯片物理容错性能的下降,从而导致器件的寿命下降.如何保证NAND闪存的使用寿命是目前闪存器件的研究热点问题.纠错编码的软判决译码器应用到NAND闪存中能够充分提供数据可靠性保障,但其在数据读取时的量化方法是核心问题之一.针对目前最大互信息量化方法没有考虑纠错编码码字特性的缺点,本文提出使用密度进化量化算法来进行基于低密度奇偶校验码(low density parity check,LDPC)码字特征的量化.为了适应NAND信道非对称的特点,本文进一步提出首先利用比特翻转器来将实际非对称译码器输入对称化,然后通过使用固定比例方法进一步减少搜索最佳读取电压位置的复杂度.经在NAND闪存信道下的数值仿真比较,本文提出的量化算法可以比最大互信息量化算法更好地提升译码性能,能够显著提升闪存器件的寿命.

关键词： NAND闪存非对称信道 LDPC码量化密度进化

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“不是X吗”的序列特征与立场表达

语言教学与研究 2023年第3期 68-79页

作者：郑娟曼陈泽群温州大学国际教育学院 325035 暨南大学文学院 511443

会话序列中的“不是X吗”存在两种对立的位置分布,即处于话轮转接位置和非话轮转接位置。两者都与立场表达的功能解读有关。也就是说,“不是X吗”是对位置敏感的。我们基于一个新立场或当前立场产生方式的差异,提出“质疑立场”“发现... 详细信息

会话序列中的“不是X吗”存在两种对立的位置分布,即处于话轮转接位置和非话轮转接位置。两者都与立场表达的功能解读有关。也就是说,“不是X吗”是对位置敏感的。我们基于一个新立场或当前立场产生方式的差异,提出“质疑立场”“发现立场”“唤醒立场”这三个能反映立场动态更新性的概念。其中,话轮转接位置的“不是X吗”关涉质疑立场和发现立场,表达的是前景信息。非话轮转接位置的“不是X吗”关涉唤醒立场,表达的是背景信息。三者在信息量上依次递减。序列特征和不同立场表达功能之间存在互动关系。

关键词： “不是X吗” 质疑立场发现立场唤醒立场

Free-spectral-range-free filters with ultrawide tunability across the S+C+L band

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Photonics Research 2021年第6期9卷 1013-1018页

作者： CHUNLEI SUN CHUYU ZHONG maOLIANG WEI HUI ma YE LUO zequn CHEN RENJIE TANG JIALING JIAN HONGTAO LIN LAN LI Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China School of Microelectronics Zhejiang UniversityHangzhou 310027China

Optical filters are essential parts of advanced optical communication and sensing systems.Among them,the ones with an ultrawide free spectral range(FSR)are especially critical.They are promising to provide access to numerous wavelength channels highly desired for large-capacity optical transmission and multipoint multiparameter sensing.Present schemes for wide-FSR filters either suffer from limited cavity length or poor fabrication tolerance or impose an additional active-tuning control requirement.We theoretically and experimentally demonstrate a filter that features FSR-free operation capability,subnanometer optical bandwidth,and acceptable fabrication tolerance.Only one single deep dip within a record-large waveband(S+C+L band)is observed by appropriately designing a side-coupled Bragg-grating-assisted Fabry–Perot filter,which has been applied as the basic sensing unit for both the refractive index and temperature measurement.Five such basic units are also cascaded in series to demonstrate a multichannel filter.This work provides a new insight to design FSR-free filters and opens up a possibility of flexible large-capacity integration using more wavelength channels,which will greatly advance integrated photonics in optical communication and sensing.

关键词： free desired insight