检索结果-南通市图书馆

Sodium bismuth titanate-based perovskite ceramics with high energy storage efficiency and discharge performance

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2022年第5期8卷 1077-1085页

作者： Jiahui Wang fudong zhang Zhanhui Peng Xiaolian Chao Zupei Yang Key Laboratory for Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an710062ShaanxiChina

Designing dielectric materials with the tremendous energy storage density is fundamentally important for developing pulse power *** effective approach was proposed to favorably modify the dielectric energy storage properties(ESP)of Bi_(0.5)Na_(0.5)TiO_(3) ceramics using CaTiO_(3) *** dielectric breakdown strength was effectively enhanced,and simultaneously the relaxor behavior was optimized to lower the remnant polarization,which is resulted from the decreased grains size with the introduction of Ca^(2+)***,at a CaTiO_(3) doping level of 0.2,a 0.8Bi_(0.5)Na_(0.5)TiO_(3)-0.2CaTiO_(3)(0.8BNT-0.2CT)ceramic obtained both high energy storage density(Wtotal)of~1.38 J/cm^(3) together with excellent efficiency(h)of~91.3%.Furthermore,an ultrafast discharge response speed(t0:9)~94 ns was achieved in 0.8BNT-0.2CT ceramic,as well as tremendous current density(C_(D)~1520 A/cm2)and power density(P_(D)~115 MW/cm^(3)).This study not only revealed the superior ESP mechanism as regards Bi_(0.5)Na_(0.5)TiO_(3) based ceramics but also provided candidate materials in pulse power capacitor devices.

关键词： Bi_(0.5)Na_(0.5)TiO_(3)ceramics Grain size Relaxor behavior High energy storage density Energy storage efficiency Ultrafast charge-discharge

Asymmetric multilayered MXene-Ag NWs/cellulose nanofiber composite films with antibacterial properties for high-efficiency electromagnetic interference shielding

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第34期129卷 181-189页

作者： fudong zhang Penggang Ren Zhengzheng Guo Jin Wang Zhengyan Chen Ze Zong Jie Hu Yanling Jin Fang Ren The Faculty of Printing Packaging Engineering and Digital Media TechnologyXi’an University of TechnologyXi’an 710048China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China

Flexible, lightweight, robust and versatile properties are essential for the next generation of wearable as well as intelligent electromagnetic interference(EMI) shielding materials. In this work, multilayered films containing cellulose nanofiber(CNF) layers, CNF/MXene layers, and CNF/silver nanowires(CNF/Ag NWs)layers were fabricated by an efficient and easy-to-use vacuum filtration method. Compared with a uniformly mixed film, the resultant layered composite films that loaded with a low MXene and AgNWs content exhibit superior mechanical properties with a tensile strength of 137 MPa, a strain at break of 5.7%, excellent EMI shielding effectiveness(EMI SE) of 61.9 d B, and higher EMI SE/t of 20,653 d B cm^(-1).This is attributed to the high-performance CNF substrate, the highly efficient layered structures, and extensive hydrogen-bonding interactions. In particular, a high degree of ohmic loss of multiple interfaces and polarization relaxation of local defects, as well as an abundance of terminal groups, favor the loss of electromagnetic waves(EMW) within the material. In addition, the prepared multifunctional layered composite films also show good antibacterial properties. As a result, the obtained new kind of flexible layered structure EMI shielding composite films with excellent EMI shielding performance, and mechanical properties present promising application prospects in the fields of EMI shielding and protection for aerospace, portable, and wearable flexible electronic devices.

关键词： MXene AgNWs Laminar structure Electromagnetic interference shielding Flexibility

CNPC's Future Exploration Targets for Giant Gas Fields

在线全文

学校读者我要写书评

暂无评论

China Oil & Gas 2012年第2期19卷 14-20页

作者： Fan Wenke zhang fudong Wang Zongli Yang Dong Yang Shen PetroChina Exploration and Production Company Langfang Brach of PetroChina Petroleum Exploration and Development Research Institute

Potential exploration targets for giant gas fields Based on the distribution of remaining gas resources, the exploration targets selection as well as an analysis of controlling factors for giant gas reservoirs （ proven gas reserve in place 〉 30 bcm）, CNPC determined to focus its exploration in the Sulige area and east part of Erdos Basin, the Xujiahe Formation and reef flat in central Sichuan Basin, Tazhong and Kuche areas in Tarim Basin,

关键词：中国石油天然气集团公司勘探目标大气田塔里木盆地油气资源分布鄂尔多斯盆地天然气储量控制因素

同方期刊数据库

Mechanism investigation of PtPd decorated Zn_(0.5)Cd_(0.5)S nanorods with efficient photocatalytic hydrogen production combining with kinetics and thermodynamics

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2021年第10期42卷 1677-1688页

作者： Linhe zhang fudong zhang Huaqing Xue Jianfeng Gao Yong Peng Weiyu Song Lei Ge State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum BeijingBeijing 102249China Department of New Energy Research Institute of Petroleum Exploration&DevelopmentPetroChinaBeijing 100083China Department of Applied Chemistry College of ScienceChina University of Petroleum BeijingBeijing 102249China

Different components of PtPd bimetallic cocatalysts modified Zn_(0.5)Cd_(0.5)S nanorods have already been designed and prepared in this *** obtained hybrid photocatalysts were tested and characterized by XPS,ICP-OES and UV-Vis spectra,TEM and EDX *** characterizations can prove the formation of PtPd bimetallic alloy particles in hybrid *** visible light illumination,an outstanding hydrogen producing rate of 9.689mmol·g^(-1)·h^(-1) and a high AQY efficiency up to 10.43%at 420 nm are achieved in this *** addition,thermodynamics(DFT calculations)and kinetics(Photoluminescence emission,photocurrent responses,electrochemical impedance spectroscopy and surface photovoltage spectra)investigations illustrate that PtPd bimetallic alloy has similar catalytic thermodynamic properties to Pt,which can greatly boost the charge separation and speed up the charge transfer,and decrease the activation energy of H2 ***,the calculation data suggests that Pt is thermodynamically favorable,while PtPd alloy is kinetically beneficial to H_(2)production,which can be ascribed to the higher activity of PtPd/Zn_(0.5)Cd_(0.5)S than Pt/Zn_(0.5)Cd_(0.5)*** work can propose a fresh perspective for preparing high efficiency hybrid photocatalysts.

关键词： PtPd alloy Zn_(0.5)Cd_(0.5)S nanorods Photocatalytic hydrogen evolution DFT calculation

基于最小二乘支持向量机的油页岩含油率近红外光谱分析

在线全文

学校读者我要写书评

暂无评论

高等学校化学学报 2016年第10期37卷 1792-1798页

作者：张福东刘杰王智宏吉林大学仪器科学与电气工程学院长春130021

为了提高油页岩含油率近红外光谱分析建模的预测精度和稳定性,开展了基于最小二乘支持向量机(LS-SVM)建模方法的对比研究.采用主成分-马氏距离(PCA-MD)和基于蒙特卡洛采样(MCS)2种方法进行了奇异样本的检测,采用径向基核函数的LS-SVM、... 详细信息

为了提高油页岩含油率近红外光谱分析建模的预测精度和稳定性,开展了基于最小二乘支持向量机(LS-SVM)建模方法的对比研究.采用主成分-马氏距离(PCA-MD)和基于蒙特卡洛采样(MCS)2种方法进行了奇异样本的检测,采用径向基核函数的LS-SVM、偏最小二乘(PLS)和反向传播神经网络(BPANN)3种方法进行建模方法对比.结果表明,对于64个油页岩岩芯样本,与PCA-MD方法相比,采用MCS方法剔除奇异样本后所建PLS模型的预测精度提高了28%.对于MCS方法剔除奇异样本后的58个样品,采用KennardStone法划分了44个样品的校正集和14个样品的预测集,采用2阶导数和标准化预处理方法,建立了100个LS-SVM的校正模型,模型的预测决定系数R2平均值达到0.90以上,高于PLS和BPANN模型的对应值;且R2的变化量(0.02)小于BPANN模型的对应值(0.32).因此,MCS奇异样本检测结合LS-SVM方法可提高油页岩含油率样本建模的精度和稳定性.

关键词：最小二乘支持向量机油页岩含油率近红外光谱分析奇异样本

在线全文

学校读者我要写书评

暂无评论

循环式消防水幕系统设计初探

给水排水 2010年第S1期36卷 323-325页

作者：张福东中国人民武装警察部队学院消防指挥系廊坊065000

安装消防水幕系统是一种有效的防火分隔方法,但因其用水量过大,推广和应用受到限制。此外,储存大量的消防用水,不用于主动灭火,而用于被动防火的做法,不符合火灾中应积极主动灭火的原则,造成了一定的浪费。因此,为提高消防水幕系统用水... 详细信息

安装消防水幕系统是一种有效的防火分隔方法,但因其用水量过大,推广和应用受到限制。此外,储存大量的消防用水,不用于主动灭火,而用于被动防火的做法,不符合火灾中应积极主动灭火的原则,造成了一定的浪费。因此,为提高消防水幕系统用水效率,改进了系统组成结构,提出循环式消防水幕系统的概念,并阐述了设计思路和可行性。

关键词：消防水幕系统节水循环设计

PetroChina's Natural Gas Exploration Clue in the Near Future

在线全文

学校读者我要写书评

暂无评论

China Oil & Gas 2002年第3期9卷 24-27页

作者： Li Jingming Chen Mengjin Li Dongxu and zhang fudong(Langfang Branch of Petroleum Exploration and Development Research Institute) Langfang Branch of Petroleum Exploration and Development Research Institute

PetroChina's natural Exploration Situationand ProblemsExploration situationRecently natural gas development of PetroChina Company Limited (hereinafter referred to as PetroChina) was in good situation. Its natural gas ... 详细信息

关键词： PetroChina’s Natural Gas Exploration Clue in the Near Future

在线全文

学校读者我要写书评

暂无评论

幅度加权相控参量阵波束合成方法研究

仪器仪表学报 2016年第2期37卷 429-436页

作者：张富东徐利梅陈敏黄大贵电子科技大学航空航天学院成都611731 电子科技大学机械电子工程学院成都611731

在基于均匀幅度加权模型完成波束偏转时,参量阵差频波存在波瓣展宽以及生成高强度旁瓣与栅瓣的问题。首先通过理论仿真及实验测试,对该加权模式下的差频波波束合成结果以及旁瓣与栅瓣的抑制情况进行了分析;然后提出了基于道尔-切比雪夫... 详细信息

在基于均匀幅度加权模型完成波束偏转时,参量阵差频波存在波瓣展宽以及生成高强度旁瓣与栅瓣的问题。首先通过理论仿真及实验测试,对该加权模式下的差频波波束合成结果以及旁瓣与栅瓣的抑制情况进行了分析;然后提出了基于道尔-切比雪夫幅度加权模型的相控参量阵波束赋形方法,通过仿真分析与实验测试,发现道尔-切比雪夫幅度加权模型比均匀幅度加权模型具有更好的旁瓣抑制能力。采用该方式生成的差频波波束宽度在不同偏转角下均有明显减小;主瓣与栅瓣强度差值增加,栅瓣得到有效抑制。该方法的提出对于提高相控参量阵波束质量具有积极意义。

关键词：参量阵均匀幅度加权道尔-切比雪夫幅度加权波束偏转.

在线全文

学校读者我要写书评

暂无评论

简论阮福的《孝经义疏补》

湖北工程学院学报 2013年第4期33卷 24-32页

作者：张付东西华师范大学历史文化学院四川南充637002

阮福《孝经义疏补》对《孝经注疏》做了大规模的修苴与补正,使其文字得到校定,内容得到补充,谬误得到纠正,体例得到调整,渊源得到厘清,是《孝经注疏》流传史上的又一里程碑。它博纳广采,补阙备异,精于校勘,既注重吸收汉学家考据、辑佚... 详细信息

阮福《孝经义疏补》对《孝经注疏》做了大规模的修苴与补正,使其文字得到校定,内容得到补充,谬误得到纠正,体例得到调整,渊源得到厘清,是《孝经注疏》流传史上的又一里程碑。它博纳广采,补阙备异,精于校勘,既注重吸收汉学家考据、辑佚、训诂等方面的新近成果,又对古书颇多涉猎,是一部乾嘉汉学影响下较为纯粹的学术性专著,具有重要的研究价值和文献学意义。

关键词：阮福阮元《孝经义疏补》《孝经注疏》价值