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Fabrication of N,S co-doped carbon immobilized high-density Co single atoms toward electro-oxidation of organic sulfides with water as feedstock

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Nano Research 2023年第5期16卷 6593-6600页

作者： Pei Zhu Wen-Xiong Shi Ying Wang Zhi-Ming Zhang Lina Li Changhua An Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Advanced Functional Porous MaterialsInstitute for New Energy Materials&Low-Carbon TechnologiesTianjin University of TechnologyTianjin 300384China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China Department of Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong Kong 999077China

Development of high-density single atoms site(SAs)electrocatalysts is highly desirable due to their extraordinary catalytic performance.However,their synthesis is still challenging and their anticorrosion capacities in electrolyte(particularly in acidic electrolyte)are unsatisfying.Herein,we have constructed N,S co-doped carbon to anchor~10 wt.%Co SAs(Co-SAs/NSC)via a novel polymerization–sulfurization–pyrolysis strategy toward selective electro-oxidation of thioethers in acidic solution.The asobtained Co SAs has a coordination geometry of Co-S_(2)N_(4),exhibiting excellent electrocatalytic activity and robust stability.At a low potential of 1.40 V vs.reversible hydrogen electrode(RHE),the conversion rate of thioethers over Co-SAs/NSC reaches 99.7%with 100%selectivity and 100%Faraday efficiency(FE)for producing sulfoxide,which is higher than the commercial Pt electrode and the reported state-of-the-art catalysts.Theoretical calculations and experiments reveal that the Co-S_(2)N_(4)structure endows the outstanding electro-oxidation activity of Co SAs through significantly promoting desorption of the products.This work presents a convenient strategy to build high-performance SAs catalysts for the resourceful use of sulfur-containing pollutants.

关键词： single-atom cobalt high density selective oxidation electrocatalysis

Recent progress in InGaZnO FETs for high-density 2T0C DRAM applications

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Science China(Information Sciences) 2023年第10期66卷 61-83页

作者： Shengzhe YAN Zhaori CONG Nianduan LU Jinshan YUE Qing LUO Institute of Microelectronics of the Chinese Academy of Sciences University of Chinese Academy of Sciences

In the past several decades, the density and performance of transistors in a single chip have been increasing based on Moore’s Law. However, the slowdown of feature size reduction and memory wall in the von Neumann architecture restrict the improvement of system performance and energy efficiency. Thus the requirements of the emerging big data and artificial intelligence applications cannot be met. To address this issue, novel devices and architectures are being explored. Among them, the InGaZnO(IGZO) fieldeffect transistor(FET) device and the computing-in-memory(CIM) architecture can be possible solutions for high-density, high-performance, and high-efficiency applications. Herein, we review the recent progress in IGZO-based FETs for dynamic random access memory(DRAM) applications. The mechanism of IGZO FETs, compact modeling of IGZO transistors, progress of IGZO manufacturing process, IGZO circuit design,and IGZO-based CIM and 3D integration architectures are presented. Furthermore, the challenges and future trends of IGZO research are discussed.

关键词： IGZO FET 2T0C DRAM high density compact modeling computing-in-memory monolithic 3D integration

high density gas state at water/graphite interface studied by molecular dynamics simulation

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Chinese Physics B 2008年第7期17卷 2646-2654页

作者：王春雷李朝霞李敬源修鹏胡钧方海平 Shanghai Institute of Applied Physics Chinese Academy of Sciences Graduate School of the Chinese Academy of Sciences Department of Physics Zhejiang University School of Physics and Microelectronics Shandong University Bio-X Life Sciences Research Center College of Life Science and TechnologyShanghai Jiaotong University

In this paper molecular dynamics simulations are performed to study the accumulation behaviour of N2 and H2 at water/graphite interface under ambient temperature and pressure. It finds that both N2 and H2 molecules can accumulate at the interface and form one of two states according to the ratio of gas molecules number to square of graphite surface from our simulation results： gas films （pancake-like） for a larger ratio and nanobubbles for a smaller ratio. In addition, we discuss the stabilities of nanobubbles at different environment temperatures. Surprisingly, it is found that the density of both kinds of gas states can be greatly increased, even comparable with that of the liquid N2 and liquid H2. The present results are expected to be helpful for the understanding of the stable existence of gas film （pancake-like） and nanobubbles.

关键词： nanobubbles and gas film hydrophobic interface molecular dynamics simulations high density

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Luminescent properties of Tb3＋ doped high density borogermanate scintillating glasses

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Journal of Rare Earths 2017年第8期35卷 787-790页

作者：钱珊黄立辉赵士龙徐时清 College of Materials Science and Engineering China Jiliang University Hangzhou 310018 China

Tb3＋-doped high density borogermanate glasses were prepared by melt-quenching method. Their physical and luminescent properties including differential thermal analysis（DTA）, density, transmittance spectra, photoluminescence, and X-ray excited luminescence spectra were investigated. The densities of the glasses doped with Tb3＋ were in the range from 5.690 to 6.086 g/cm3. Under UV and X-ray excitations, the glasses showed intense green emissions. The lifetimes of Tb3＋ doped borogermanate glasses were in the range from 1.597 to 1.869 ms. The results indicated that Tb3＋ doped borogermanate glasses could be scintillator candidate used in X-ray detection application.

关键词： luminescence Tb3＋ scintillating glass high density rare earths

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Novel vertical channel double gate structures for high density and low power flash memory applications

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Science in China(Series F) 2008年第6期51卷 799-806页

作者： HUANG Ru ZHOU FaLong CAI YiMao WU DaKe ZHANG Xing Institute of Microelectronics Peking University Beijing 100871 China

The flash memory technology meets physical and technical obstacles in further scaling. New structures and new materials are implemented as possible solutions. This paper focuses on two kinds of new flash cells for high density and low power memory applications based on the vertical channel double gate structure. The proposed VD-NROM with dual-nitride-trapping-layer and vertical structure can achieve four-bit-per-cell storage capability. And the proposed VSAS-FG cell benefits the high programming efficiency, low power and high density capability, which can be realized without any additional mask and can achieve the self-alignment of the split-gate channel and the floating-gate. The two novel flash cell structures can be considered as potential candidates for different flash memory applications.

关键词： double gate devices flash memory high density low power

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high cell density and high expression of recombinant human ApoA-I_(Milano) in Escherichia coli by twice temperature-shifted induction

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Frontiers in Biology 2006年第4期1卷 345-348页

作者： ZHUANG Yingping MA Wenfeng GUO Meijin DING Mansheng CHU Ju ZHANG Siliang State Key Laboratory of Bioreactor Engineering National Research Center for BiotechnologyEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Bioreactor Engineering and National Research Center for Biotechnology East China University of Science and TechnologyShanghai 200237China

The effect of temperature on the formation of recombinant protein,apolipoprotein A-IMilano was investigated in the present study.The temperature of the initial growth phase was set at 30ºC,while temperature variation in induction phase was arranged in three modes.high cell-density culture of Escherichia coli and high expression of recombinant human by twice temperature-shifted induction were carried out.Experimental results showed that ApoA-IMilano reached 4.8 g/L with the final cell density of OD600,150.It was found that twice temperature-shifted induction could successfully avoid the effect of acetic acid on cell density and the expression of the product.The present study provides a basic procedure for the production of recombinant ApoA-IMilano.

关键词： recombinant Escherichia coli ApoA-IMilano high density high expression twice temperature-shifted induction

The“gene”of reversible phase transformation of phase change materials:Octahedral motif

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Nano Research 2022年第2期15卷 765-772页

作者： Zhitang Song Ruobing Wang Yuan Xue Sannian Song State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro-System and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Nonvolatile phase change random access memory(PCRAM)is regarded as one of promising candidates for next-generation memory in the era of Big Data.The phase transition mechanism of phase change materials is the key scientific issue to be addressed for phase change memory.Moreover,obtaining homogeneous phase change materials with high speed,low power consumption,long life and good thermal stability is still the ultimate challenge for high-density three-dimensional(3D)PCRAM.In this paper,starting from the octahedral structure motifs(octahedrons)which are considered as the"gene"of phase change materials,a new view on the phase transition mechanism is proposed.Based on this mechanism,a homogeneous phase change material is developed by constructing three matched octahedrons,which achieved an overall improvement in performance,showing 180℃ten-year data retention,6 ns SET speed,one order of magnitude longer life time and 75%reduced power consumption compared with traditional Ge_(2)Sb_(2)Te_(5)(GST)devices.It is of great significance to use it in 3D PCRAM chip and multi-level brain-inspired computing chip in the future.

关键词： phase change memory phase transition mechanism octahedral atomic motifs matching high density

Thermal and Optical Properties of Cyanine Dye for high density Digital Versatile Disc-Recordable (DVD-R)

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Chinese Journal of Lasers 2000年第4期 62-68页

作者： DONG Xuying GAN Fuxi GU Donghong YIN Jinlong (Shanghai Institute of Optics and Fine Mechanics, The Chinese Academy of Sciences, Shanghai 201800, China)

A new cyanine thin film has been prepared for high density digital versatile disc recordable (DVD R) by means of a spin coating process. The effects of the optical and thermal properties of the cyanine dye on recording characteristics have been studied. Rapid decomposition of the cyanine dye in a narrow temperature range, which is critical to the clear mark edges, is shown in this paper. A steep absorption edge at the 635 nm is crucial to high reflectivity. The optical recording performance of the cyanine dye thin film shows that high reflectivity contrast (48%) can be obtained at low writing power and narrow writing pulse width using He Ne laser (632.8 nm) irradiation. The carrier to noise ratio (CNR) of the single layer disk is greater than 40 dB at travelling rate of 2.4 m/s.

关键词： DVD R disc high density cyanine dye thermo gravimetric analyses (TG)

Making Public Space in high-density Environment: Strategy and Methodology of Landscape Urbanism

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Journal of Landscape Research 2016年第3期8卷 53-56,59页

作者： WANG Yi ZHENG Fen College of Architecture and Urban Planning Tongji University The Architectural Design & Research Institute of Zhejiang University Co.Ltd

high concentration of population and other elements brought by high urbanization has pushed the future construction of urban public spaces to be both "compact" and "ecological". Theory and methodology of landscape urbanism provides a new perspective for the construction of public spaces in high-density urban environment. Based on the concept and basic standpoints of landscape urbanism, this paper elaborated its potential value in spatial connection, functional integration and vitality promotion, and also analyzed practical strategies of landscape urbanism from three perspectives of structure, fold and stage by combining with typical cases, so as to provide references for designing urban public spaces in high-density environment.

关键词： Landscape urbanism high density Public space Strategy