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Machine learning assisted prediction of dielectric temperature spectrum of ferroelectrics

Journal of Advanced Ceramics 2023年第9期12卷 1793-1804页

作者： Jingjin He Changxin Wang Junjie Li Chuanbao Liu Dezhen Xue Jiangli cao Yanjing Su Lijie Qiao Turab Lookman Yang Bai Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China institute for Advanced Material and Technology University of Science and Technology BeijingBeijing 100083China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Sichuan Province Key Laboratory of Information Materials and Devices Application College of Optoelectronic EngineeringChengdu University of Information TechnologyChengdu 610225China School of Materials Science and Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China AiMaterials Research LLC Santa FeNM 87501USA

In material science and engineering,obtaining a spectrum from a measurement is often time-consuming and its accurate prediction using data mining can also be *** this work,we propose a machine learning strategy based on a deep neural network model to accurately predict the dielectric temperature spectrum for a typical multi-component ferroelectric system,i.e.,(Ba_(1−x−y)Ca_(x)Sr_(y))(Ti_(1−u−v−w)Zr_(u)Sn_(v)Hf_(w))O_(3).The deep neural network model uses physical features as inputs and directly outputs the full spectrum,in addition to yielding the octahedral factor,Matyonov–Batsanov electronegativity,ratio of valence electron to nuclear charge,and core electron distance(Schubert)as four key *** to the physically meaningful features,our model exhibits better performance and generalization ability in the broader composition space of BaTiO3-based solid *** the prediction accuracy is superior to traditional machine learning models that predict dielectric permittivity values at each ***,the transition temperature and the degree of dispersion of the ferroelectric phase transition are easily extracted from the predicted spectra to provide richer physical *** prediction is also experimentally validated by typical samples of(Ba_(0.85)Ca_(0.15))(Ti_(0.98–x)Zr_(x)Hf_(0.02))O_(3).This work provides insights for accelerating spectra predictions and extracting ferroelectric phase transition information.

关键词： machine learning(ML) dielectric temperature spectrum ferroelectrics phase transition information

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A valine residue deletion in ZmSig2A, a sigma factor, accounts for a revertible leaf-color mutation in maize

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The Crop Journal 2021年第6期9卷 1330-1343页

作者： Chuan Li Jingwen Wang Zhaoyong Hu Yuanyan Xia Qiang Huang Tao Yu Hongyang Yi Yanli Lu Jing Wang Moju cao Maize Research institute Sichuan Agricultural UniversityChengdu 611130SichuanChina State Key Laboratory of Crop Gene Exploration and Utilization in southwest china Chengdu 611130SichuanChina

A nuclear-encoded sigma(σ) factor is essential for the transcriptional regulation of plant chloroplastencoded genes. Five putative maize r factors have been identified by database searches, but their functions are unknown. We report a maize leaf color mutant etiolated/albino leaf 1(eal1) that was derived from space mutation breeding. The eal1 mutant displays etiolated or albino leaves that then gradually turn to normal green at the seedling stage. The changes in eal1 leaf color are associated with changes in photosynthetic pigment content and chloroplast development. Map-based cloning revealed that a single amino-acid deletion changing Val_(480)-Val_(481)-Val_(482) to Val_(480)-Val_(481), in the C-terminal domain σ_(4) of the putative σ factor ZmSig2A, is responsible for the eal1 mutation. In comparison with the expression level of the wild-type(WT) allele ZmSig2A^(+) in WT plants, much higher expression of the mutant allele ZmSig2A^(⊿V) in eal1 plants was detected before the eal1 plants turned to normal green. ZmSig2A shows the highest similarity to rice OsSig2A and Arabidopsis SIG2. Ectopic expression of ZmSig2A^(+) or ZmSig2A^(⊿V) driven by the cauliflower mosaic virus 35 S promoter rescued the pale green leaf of the sig2 mutant, but ectopic expression of ZmSig2A^(⊿V) driven by the SIG2 promoter did not. We propose that the Val deletion generated a new weak allele of ZmSig2A that cannot completely abolish the ZmSig2A function. Some genes involved in chloroplast development and photosynthesis-associated nuclear genes showed significant expression differences between eal1 and WT plants. We conclude that ZmSig2A encoding a r factor is essential for maize chloroplast development. The eal1 mutant with a weak allele of ZmSig2A represents a valuable genetic resource for investigating the regulation of ZmSig2A-mediated chloroplast development in *** eal1 mutation may be useful as a marker for early identification and elimination of false hybrids or transgene transm

关键词： Leaf color mutant Map-based cloning Sigma factor Chloroplast development Maize

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Micellar Catalysis:Visible-Light Mediated Imidazo[1,2-a]pyridine C—H Amination with N-Aminopyridinium Salt Accelerated by Surfactant in Water

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Chinese Journal of Chemistry 2021年第12期39卷 3347-3352页

作者： Zhonglie Yang Kun cao Xiaoyan Peng Li Lin Danchen Fan Jun-Long Li Jingxia Wang Xiaobin Zhang Hezhong Jiang Jiahong Li Sichuan Engineering Research Center for Biomimetic Synthesis of Natural Drugs School of Life Science and EngineeringSouthwest Jiaotong UniversityChengduSichuan 610041China Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of AntibioticsSchool of PharmacyChengdu UniversityChengduSichuan 610106China Irradiation Preservation Technology Key Laboratory of Sichuan Province Sichuan Institute of Atomic EnergyChengduSichuan 610101China

A light-promoted metal-free protocol for the amination of imidazo[1,2-a]pyridines with N-aminopyridinium salt by the assistance of surfactants in water was reported,charactering mild and environmentally benign conditions,as well as great functional group *** with negatively charged polar surface and hydrophobic core formed from sodium dodecyl sulfate serve as an ideal medium for visible-light mediated radical reaction of cationic pyridine salt and imidazo[1,2-a]pyridine in aqueous *** electrostatic interaction between positively charged N-aminopyridinium and negatively charged surface of micelles is of great significance in this method.

关键词： Photochemistry Water chemistry Micelles N-Aminopyridinium salt Imidazo[1,2-a]pyridine

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Improvement of in situ LA-ICP-MS U-Pb dating method for carbonate minerals and its application in petroleum geology

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Science china Earth Sciences 2023年第12期66卷 2914-2929页

作者： Xuesong Lu Lili GUI Weiyan CHEN Shaobo LIU Shitou WU Junjia FAN Qiang LIU Jing SUN Liangliang ZHANG Yang XIAO Wenxia YANG Rizhou cao Research institute of Petroleum Exploration and Development Beijing 100083China Key Laboratory of Basin Structure and Hydrocarbon Accumulation CNPCBeijing 100083China institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China School of Geosciences China University of Petroleum(Beijing)Beijing 102249China institute of Earth Sciences China University of Geosciences(Beijing)Beijing 100083China Sichuan Chuangyuan Weipu Analytical Technology Co. Ltd.Chengdu 610059China School of Geosciences Changjiang UniversityWuhan 430100China Research institute of Exploration and Development Daqing Oilfield CoLtd.Daqing 163712China

In situ carbonate U-Pb dating is gaining popularity,and it has great potential for application in petroleum ***,the low U content(<10μg/g)and high common Pb content of carbonate minerals,along with the uneven distrib... 详细信息

In situ carbonate U-Pb dating is gaining popularity,and it has great potential for application in petroleum ***,the low U content(applied to two carbonate samples with low U and high common Pb contents that were difficult to date by traditional *** two samples are the saddle dolomite in the central Sichuan Basin and the calcite cement in the sandstone reservoir of the Cretaceous Qingshuihe Formation in the South Junggar *** robust ages have been obtained,which constrains the timing of the diagenetic and

关键词： Carbonate U-Pb dating LA-SF-ICP-MS Ablation craters Fractionation effects Systematic offset Critical time limitation

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Regulating the interfacial charge transfer and constructing symmetry-breaking sites for the enhanced N_(2) electroreduction activity

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Carbon Energy 2023年第2期5卷 193-200页

作者： Xiaoxue Zhang Yuehan cao Zhen-Feng Huang Shishi Zhang Chengguang Liu Lun Pan Chengxiang Shi Xiangwen Zhang Ying Zhou Guidong Yang Ji-Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjinChina Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) TianjinChina Zhejiang institute of Tianjin university NingboZhejiangChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of New Energy and MaterialsInstitute of Carbon NeutralitySouthwest Petroleum UniversityChengduSichuanChina XJTU-Oxford International Joint Laboratory for Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'anShaanxiChina

The Haber-Bosch process for industrial NH_(3) production is energy-intensive with heavy CO_(2) *** N_(2) reduction reaction(NRR)is an attractive carbon-neutral alternative for NH_(3) synthesis,while the challenge associated with N_(2) activation highlights the demand for efficient ***,we demonstrate that PdCu nanoparticles with different Pd/Cu ratios anchored on boron nanosheet(PdCu/B)behave as efficient NRR electrocatalysts toward NH_(3) *** and experimental results confirm that the highly efficient NH_(3) synthesis can be achieved by regulating the charge transfer between interfaces and forming a symmetry-breaking site,which not only alleviates the hydrogen evolution but also changes the adsorption configuration of N_(2) and thus optimizes the reaction pathway of NRR over the separated Pd *** with monometallic Pd/B and Cu/B,the PdCu/B with the optimized Pd/Cu ratio of 1 exhibits superior activity and selectivity for NH_(3) *** study provides new insight into developing efficient catalysts for small energy molecule catalytic conversion via regulating the charge transfer between interfaces and constructing symmetry-breaking sites.

关键词： catalyst design electrochemical N_(2)reduction interfacial charge transfer reaction mechanism symmetry-breaking sites

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Graphene oxide coated three-dimensional printed biphasic calcium phosphate scaffold for angiogenic and osteogenic synergy in repairing critical-size bone defect

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Journal of Materials Science & Technology 2023年第14期145卷 25-39页

作者： Yitian Wang Yonghao Wu Yuqi Zhang Xiangfeng Li Li Min Quanle cao Yi Luo Xiao Yang Minxun Lu Yong Zhou Xiangdong Zhu Chongqi Tu Xingdong Zhang Orthopedic Research institute Department of OrthopedicsWest China HospitalSichuan UniversityChengdu 610041China Sichuan Model worker and Craftsman Talent Innovation Research Studio Sichuan ProvinceChina National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China

The custom-tailored medicine requires a developmental strategy that integrates excellent osteogene-sis with mechanical stability to enhance the reconstruction of the critical-size bone defect(CSBD)and the healing process in weight-bearing *** prepared three-dimensional(3D)printed biphasic cal-cium phosphate(BCP)scaffolds composited with nano-graphene oxide(GO).The biological effects of the GO/BCP composite scaffolds could induce the differentiation of rat bone marrow stem cells(BM-SCs)and the migration of human umbilical vein endothelial cells(HUVECs)for bone *** proper ratio of GO in the composite scaffold regulated the composites’surface roughness and hydrophilicity to a suitable range for the adhesion and proliferation of BMSCs and ***,the GO/BCP composite scaffold increased osteogenesis and angiogenesis by activating BMP-2,RUNX-2,Smad1/4,and *** customized intramedullary nail combined with GO/BCP scaffold was applied to repair CSBD(2.0 cm in length)in a beagle femur *** fixation strategy was confirmed by finite element *** vivo,the results indicated that the custom-made internal fixation provided sufficient stability in the early stage,ensuring bone healing in a considerable mechanical *** 9 months postoperatively,longitudi-nal bony union and blood vessels in osteon were observed in the CSBD area with partial degradation in the 0.3%GO/BCP *** the three-point bending test,the ultimate load of 0.3%GO/BCP group reached over 50%of the normal femur at 9 months after *** results showed a promising application of osteogenic GO/BCP scaffold and custom-made intramedullary nails in repairing CSBD of the beagle *** effective strategy could provide an option to treat the clinical CSBD in weight-bearing bones.

关键词： 3D printing Biphasic calcium phosphate ceramic Graphene oxide Segmental bone defect Angiogenesis Osteogenesis

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Experimental demonstrations of high-Q superconducting coplanar waveguide resonators

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Chinese Science Bulletin 2013年第20期58卷 2413-2417页

作者： LI HaiJie WANG YiWen WEI LianFu ZHOU PinJia WEI Qiang cao ChunHai FANG YuRong YU Yang WU PeiHeng Quantum Optoelectronics Laboratory Southwest Jiaotong University State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-sen University Research institute of Superconductor Electronics Nanjing University

We successfully designed and fabricated an absorption-type of superconducting coplanar waveguide (CPW) resonators. The resonators are made from a niobium film (about 160 nm thick) on a high-resistance Si substrate, and each resonator is fabricated as a meandered quarter-wavelength transmission line (one end is short to the ground and another end is capacitively coupled to a through feedline). With a vector network analyzer we measured the transmissions of the applied microwave through the resonators at ultra-low temperature. The obtained loaded quality factors are significantly high, i.e. up to ～10 6 . When the temperature increases slowly from the base temperature (20 mK), the resonance frequencies of the resonators are blue shifted and the quality factors are lowered slightly. In principle, this type of device can integrate a series of CPW resonators with a common feedline, making it a promising candidate as the data bus for coupling distant solid-state qubits and the sensitive detector of single photons.

关键词：共面波导谐振器实验演示超导高Q值矢量网络分析仪单光子探测器质量因素

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A write buffer design based on stable and area-saving embedded SRAM for flash applications

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Science china(Technological Sciences) 2015年第2期58卷 357-361页

作者： cao Hua Min HUO Zong Liang WANG Yu LI Ting LIU Jing JIN Lei JIANG Dan-Dan ZHANG Deng Jun LI Di LIU Ming institute of Microelectronics Chinese Academy of Sciences College of Communication Engineering Chengdu University of Information Technology Guangdong Berg Micro Co. Ltd.

This paper presents an embedded SRAM design for write buffer applications in flash *** write buffer is implemented with a newly proposed self-adaptive timing control circuit,an area-saving sense-latch circuit and 6 T SRAM cell units.A 2 kb SRAM macro with the area of 135μm×180μm is implemented in and applied to a 128 Mb NOR flash memory with the SMIC 65 nm NOR flash memory *** simulation and chip test results show that the SRAM write buffer is beneficial to high-density flash memory design.

关键词： write buffer embedded SRAM flash 65 nm technology 2 kb 128 Mb

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基于总体加权起落道量最小的铁路竖曲线优化方法研究

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铁道建筑 2021年第5期61卷 124-128页

作者：刘强刘成龙曹成度闵阳杨雪峰中铁工程设计咨询集团有限公司北京100055 西南交通大学地球科学与环境工程学院成都611756 西南交通大学高速铁路运营安全空间信息技术国家地方联合工程实验室成都611756 中铁第四勘察设计院集团有限公司武汉430063

为保证在有限的天窗时间内及时完成轨道纵断面线形的整正,在铁路竖曲线前后夹直线拟合的基础上,以竖曲线最小坡段长度、最大坡度、相邻坡段最大坡度差、最小竖曲线半径为限制条件,轨道实测点总体加权起落道量最小为目标函数,建立了铁路... 详细信息

为保证在有限的天窗时间内及时完成轨道纵断面线形的整正,在铁路竖曲线前后夹直线拟合的基础上,以竖曲线最小坡段长度、最大坡度、相邻坡段最大坡度差、最小竖曲线半径为限制条件,轨道实测点总体加权起落道量最小为目标函数,建立了铁路竖曲线优化模型。该优化模型无需对竖圆曲线进行拟合,避免了竖圆曲线在弧径比较小时出现拟合病态的问题。为验证该优化模型的正确性,对某段含有2个变坡点的轨道纵断面实测数据进行实例计算。计算结果表明,该优化模型能够一次性完成连续多段竖曲线的优化,相较于使用线路纵断面设计线形,使用优化重构后的纵断面线形指导纵断面线形的整正,轨道的平均调整量由23.52 mm下降到10.71 mm,落道量占比由93.64%下降到18.22%,这证明本文提出的铁路竖曲线优化方法是可行的。

关键词：铁路线路竖曲线理论分析轨道整正线形拟合线形优化起落道量

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聚芳酰胺纤维结构和性能的优选

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西安交通大学学报 1987年第S1期 73-82页

作者：高良玉刘耀南李建华曹启兰西安交通大学西安交通大学西安绝缘材料应用研究室

本文通过芳香族聚酰胺1313纤维(即聚芳酰胺——Nomex)结晶形态、性能和工艺关系的系统研究,解决了纤维中结晶定向关键技术。认为:纤维湿纺工艺中,热处理温度高于最大结晶速度的温度时,纤维才能形成三斜晶系,并应选择较大拉伸比,纤维的... 详细信息

本文通过芳香族聚酰胺1313纤维(即聚芳酰胺——Nomex)结晶形态、性能和工艺关系的系统研究,解决了纤维中结晶定向关键技术。认为:纤维湿纺工艺中,热处理温度高于最大结晶速度的温度时,纤维才能形成三斜晶系,并应选择较大拉伸比,纤维的结晶形态大为改善,从而使纤维性能有了大幅度提高.上列结论在小批量生产中得到证实。试制的聚芳酰胺纤维性能已接近或达到国外同类产品的水平.

关键词：绝缘材料芳香族聚酰胺1313纤维

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