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A Bilayer High-Temperature Dielectric Film with Superior Breakdown Strength and Energy Storage Density

Nano-Micro Letters 2023年第9期15卷 479-491页

作者： Jiang-Bo Ping Qi-Kun Feng yong-xin zhang xin-Jie Wang Lei Huang Shao-Long Zhong Zhi-Min Dang State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

The further electrification of various fields in production and daily life makes it a topic worthy of exploration to improve the performance of capacitors for a long time,including thin-film *** discharge energy density of thin-film capacitors that serves as one of the important types directly depends on electric field strength and the dielectric constant of the insulation ***,it has long been a great challenge to improve the breakdown strength and dielectric constant *** that boron nitride nanosheets(BNNS)possess superior insulation and thermal conductivity owing to wide band gap and 2-dimensional structure,a bilayer polymer film is prepared via coating BNNS by solution casting on surface of polyethylene terephthalate(PET)*** revealing the bandgap and insulating behavior with UV absorption spectrum,leakage current,and finite element calculation,it is manifested that nanocoating contributes to enhance the bandgap of polymer films,thereby suppressing the charge injection by redirecting their transport from *** to note that an ultrahigh breakdown field strength(~736 MV m^(−1)),an excellent discharge energy density(~8.77 J cm^(−3))and a prominent charge-discharge efficiency(~96.51%)are achieved concurrently,which is ascribed to the contribution of BNNS ultrathin *** addition,the modified PET films also have superior comprehensive performance at high temperatures(~120°C).The materials and methods here selected are easily accessible and facile,which are suitable for large-scale roll-to-roll process production,and are of certain significance to explore the methods about film modification suitable for commercial promotion.

关键词： Film capacitor Dielectric property Boron nitride nanosheets Surface coating Energy storage characteristics

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Transformation of Structure and Properties of Vesicles Induced by Transition Metal Ions

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Chinese Chemical Letters 2005年第12期16卷 1667-1670页

作者： Hong Tao GUO Fei XU Xiao Hai ZHOU Jin Feng DONG Gao yong zhang xin Lin HONG College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072

This paper proved that octodecyl propylenediamine could form vesicles in pure water and aqueous solution of CuCl2 or Cu（NO3）2. The structure and morphology of vesicles were different when the copper （Ⅱ） salt was added to the solution. The results showed that both the counterions and the ligands had strong influence on the configuration of coordinated structures and packing model in bilayer membrane of vesicles.

关键词： Octodecyl propylenediamine copper (Ⅱ) ions vesicle bilayer membrane counterions coordinated structure

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Effects of Alginate Gel on Rheological Properties of Hair-tail (Trichiurus lepturus) Surimi

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Journal of Ocean University of China 2011年第2期10卷 191-196页

作者： XUE yong LIU xin zhang Lili LIN Dan XU Jiachao XUE Changhu College of Food Science and Engineering Ocean University of China Qingdao 266003 P.R. China

Effects of alginate gel at different concentrations on rheological properties of hair-tail (Trichiurus lepturus) surimi were investigated. Alginate gel (1% - 3%) exhibited enhanced effects, especially when alginate gel concentration increased. The rheological properties of mixture samples were studied by the time sweep, frequency sweep and temperature sweep. The critical strain values of the mixture samples for the onset of non-linear viscoelasticity were about 5%. The storage modulus G' of the mixture samples increased with time for 4 h. The frequency sweep showed that G' was greater than G" for all the mixture gels with different alginate gel concentrations, and values of both n' and n" for all samples were low (<0.2), these constants corresponding to G' and G", and indicating the elasticity of mixture gels. The values of storage modulus G' decreased during heating process and increased with decreasing temperature.

关键词： hair-tail surimi alginate gel rheological properties

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Prediction on the relative permittivity of energy storage composite dielectrics using convolutional neural networks:A fast and accurate alternative to finite-element method

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iEnergy 2022年第4期1卷 463-470页

作者： Shao-Long Zhong Di-Fan Liu Lei Huang yong-xin zhang Qi Dong Zhi-Min Dang State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

The relative permittivity is one of the essential parameters determines the physical polarization behaviors of the nanocomposite dielectrics in many applications,particularly for capacitive energy *** the relative permittivity of particle/polymer nanocomposites from the microstructure is of great ***,the classical effective medium theory and physics-based numerical calculation represented by finite element method are time-consuming and cumbersome for complex structures and nonlinear *** work explores a novel architecture combining the convolutional neural network(ConvNet)and finite element method(FEM)to predict the relative permittivity of nanocomposite dielectrics with incorporated barium titanite(BT)particles in polyvinylidene fluoride(PVDF)*** ConvNet was trained and evaluated on big datasets with 14266 training data and 3514 testing data generated form a programmatic *** numerical experiments,we demonstrate that the trained network can efficiently provide an accurate agreement between the ConvNet model and FEM by virtue of the significant evaluation metrics R2,which reaches as high as 0.9783 and 0.9375 on training and testing data,*** strong universality of the presented method allows for an extension to fast and accurately predict other properties of the nanocomposite dielectrics.

关键词： Relative permittivity nanocomposite dielectrics convolutional neural networks finite element method prediction accuracy

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Research Progress on the Roles of Vitamin D3 in Gastrointestinal Cancer

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Journal of Nutritional Oncology 2018年第4期3卷 148-153页

作者： He Huang yong xin zhang Department of General Surgery the First Hospital of Shanxi Medical University Taiyua Shanxi 030000 China

Vitamin D3 is a steroid hormone. Its main functions include regulating calcium and phosphate metabolism, maintaining normal blood calcium levels, regulating bone metabolism, and regulating the physiological functions of many cells. Recent epidemiological studies suggested that vitamin D deficiency correlates with the risk of gastrointestinal cancer and a poor prognosis in cancer patients. Vitamin D3 has demonstrated anti-tumor activities, including reducing tumor cell proliferation, inducing apoptosis, and inducing cell cycle arrest in gastrointestinal cancer. Further studies showed that vitamin D3 can enhance the effects of chemotherapeutic drugs to induce apoptosis and inhibit the proliferation of gastrointestinal cancer cells. Vitamin D3 analogs also exhibit anti-tumor activity, and generally have fewer side effects than vitamin D3. This review describes the molecular characteristics and anti-cancer mechanisms of vitamin D3 and its analogs in gastrointestinal cancer.

关键词： Vitamin D3 Gastrointestinal cancer Apoptosis

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Microstructure and mechanical properties of C/C composite joint brazed with Ni-based filler

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 927-934页

作者： He-li PENG yong-xin zhang Xu CHEN Hong-qiang zhang Jun-liang XUE Wei GUO Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China Shanghai Engineering Technology Research Center of Near-net Shape Forming for Metallic Materials Shanghai 201600China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China

The novel Ni-based brazing filler was used to join C/C *** brazing temperature increased from 1080 to 1100°C,the wetting angle decreased from 23°to 14°,and the brazing filler had good wettability on the surface of C/C *** brazing seam of the brazed joint consisted of Ni(s,s)and Cr_(3)C_(2) *** brazing temperature increased,lots of Cr_(3)C_(2) phases were generated at the bonding interface,and the thick reaction layer was *** brazing temperature was 1120°C,the shear strength of C/C joint reached the maximum value of 31.5 *** fracture path extended in the C/C matrix close to the bonding interface.

关键词： brazing microstructure shear strength C/C composites

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超低排放电厂除尘器对痕量重金属的控制作用（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第1期19卷 68-79页

作者： Cheng-hang ZHENG Li WANG yong-xin zhang Wei-guo WENG Hai-tao ZHAO Jin-song ZHOU Xiang GAO State Key Laboratory of Clean Energy Utilization State Environmental Protection Center for Coal-fired Air Pollution ControlZhejiang University

目的:燃煤过程中释放的痕量重金属迁移到大气中会对人体造成很大的危害。除尘器在脱除颗粒物的同时可以协同脱除重金属,研究超低排放除尘器对重金属的控制作用效果和影响因素,可以得到提升脱除重金属效率的手段和方法,利于实现燃煤电厂... 详细信息

目的:燃煤过程中释放的痕量重金属迁移到大气中会对人体造成很大的危害。除尘器在脱除颗粒物的同时可以协同脱除重金属,研究超低排放除尘器对重金属的控制作用效果和影响因素,可以得到提升脱除重金属效率的手段和方法,利于实现燃煤电厂重金属的超低排放。方法:1.通过测试方法检测出重金属在煤、飞灰和底灰当中的绝对含量;2.通过分析重金属在飞灰和底灰中占总输入量的比例,得到三种类型除尘器对重金属的脱除效果;3.通过皮尔森相关性系数和灰色关联模型分析各影响因素对重金属在飞灰当中富集的影响作用大小。结论:1.低温电除尘器和电袋除尘器对于汞、砷和硒的脱除效果明显大于常规电除尘器;2.电除尘器的入口烟气温度越低,汞、砷和硒在除尘器中的脱除效果越好;3.煤中的硫含量对重金属在飞灰当中的吸附作用影响明显,其含量越高越不利于重金属的吸附;4.与其他影响因素相比,飞灰当中的铁氧化物和钙氧化物对重金属在飞灰当中吸附的促进作用较为有限。

关键词：超低排放除尘器重金属影响因素

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彩虹折射法对喷雾气液沉淀反应的原位表征（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第1期19卷 86-94页

作者： Xue-cheng WU Can LI Jian-zheng CAO yong-xin zhang Ling-hong CHEN Gerard GRéHAN Ke-fa CEN State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China UMR 6614/CORIA Normandie University CNRS bp 12 76801 Saint Etienne du Rouvray France

目的:喷雾气液吸收化学反应广泛存在于能源、化学和环境工程中。比如在能源环境领域,湿法烟气脱硫(WFGD)中的碱性喷雾吸收脱除气体污染物,乙醇胺(MEA)吸收脱除CO_2酸性气体。对这类反应的表征,有利于控制和改善污染物脱除效率。本文尝... 详细信息

目的:喷雾气液吸收化学反应广泛存在于能源、化学和环境工程中。比如在能源环境领域,湿法烟气脱硫(WFGD)中的碱性喷雾吸收脱除气体污染物,乙醇胺(MEA)吸收脱除CO_2酸性气体。对这类反应的表征,有利于控制和改善污染物脱除效率。本文尝试利用气液吸收沉淀反应过程中液滴折射率的变化来原位表征反应进程。创新点:1.基于彩虹折射法,首次对气液吸收沉淀反应的原位表征进行探究;2.通过若干实验和详细的传热计算分析,成功验证了其可行性和有效性。方法:1.通过与Abbe折射仪对比,确定全场彩虹测量的准确性(图3和公式(5));2.搭建全局彩虹技术(GRT)测量系统进行喷雾测量实验(图2),并记录反应过程中的彩虹图像和离线采样液滴用于显微分析(图4和5);3.对涉及到的气液吸收沉淀反应进行传热计算和分析(公式(7)^(13))。结论:1.初步表明了利用溶液折射率表征Ca(OH)_2质量分数的可行性。2.实验结果表明GRT的测量结果精确;反应后液滴折射率减少并趋向于水,反应进程可体现在彩虹角(即折射率)的变化上。3.不同浓度Ba(OH)_2吸收CO_2的反应进一步证明了该方法原位表征气液吸收沉淀反应的可行性。4.反应的传热计算和分析表明反应热所造成的温度升高可以忽略,验证了该方法的有效性。

关键词：彩虹折射法原位表征折射率气液吸收沉淀反应

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Clinical characteristics of 4355 patients with anterior cruciate ligament injury

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Chinese Medical Journal 2013年第23期126卷 4487-4492页

作者： MEI Yu AO Ying-fang WANG Jian-quan MA yong zhang xin WANG Jia-ning ZHU Jing-xian Institute of Sports Medicine Peking University Third HospitalBeijing 100191 China

Background Clinical features of anterior cruciate ligament （ACL） injury are important for its prevention,diagnosis and ***,few studies have reported such data,especially in *** purpose of this study was to describe the clinical characteristics of ACL injury on a large *** Between 1993 and 2007,a total of 4355 ACL deficient inpatients （612 athletes and 3743 non-athletes） were *** were collected using a special database *** the distributions of characteristics in different groups were compared and analyzed *** All subjects were confirmed with ACL tear during *** analysis revealed that the percentage of females in Athlete Group was significantly higher than that in Non-athlete Group （56.05％ vs.24.95％,P＜0.001）.This study also found that sports trauma was the main cause of ACL ***,basketball,judo,wrestling and track and field were the five most responsible activities for *** average injury time for athletes was significantly shorter than that for non-athletes （413.3 days vs.717.5 days,P＜0.001）.Three thousand nine hundred and eight cases were ordered ACL reconstruction （76.04％ single-bundle,18.30％ double-bundle）.Three hundred and forty-five patients （7.92％）were combined with other ligaments injuries,2667 （61.24％） were found with various grades of cartilage lesions,and 3377 （77.54％） were found with meniscal *** Sports trauma was the main cause of ACL tears in China,and reconstruction had become the principal surgical *** order to restore knee joint stability and reduce the incidence of cartilage and meniscal injury,patienttailored ACL reconstruction should be suggested at the right moment.

关键词： anterior cruciate ligament clinical characteristics incidence secondary injuries

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Hollow and filled fiber bragg gratings in nano-bore optical fibers

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Chinese Physics B 2019年第7期28卷 279-285页

作者： yong-xin zhang Sheng Liang Qian-Qing Yu Zheng-Gang Lian Zi-Nian Dong Xuan Wang Yu-Qin Lin Yu-Qi Zou Kun xing Liu-Yan Liang Xiao-Ting Zhao Li-Jing Tu Key Laboratory of Education Ministry on Luminescence and Optical Information Technology National Physical Experiment Teaching Demonstration Center Department of Physics School of Science Beijing Jiaotong University Beijing 100044 China Yangtze Optical Electronic Company Ltd. Wuhan 430205 China Wuhan University of Technology Wuhan 430070 China Anhui Agricultural University Hefei 230036 China

To combine the technical functions and advantages of solid-core fiber Bragg gratings(FBGs) and hollow-core optical fibers(HCFs), the hollow and filled FBGs in nano-bore optical fibers(NBFs) with nano-bore in the GeO2-doped core are *** fundamental mode field, effective mode index, and confinement loss of NBF with 50 nm–7 μm-diameter hollow and filled nano-bore are numerically investigated by the finite element *** reflected spectra of FBGs in NBFs are obtained by the transmission matrix *** hollow FBGs in NBFs can be acheived with ~5% power fraction in the bore and the ~0.9 reflectivity when bore diameter is less than 3 μ*** filled FBGs can be realized with^1% power fraction and 0.98 reflectivity with different fillings including o-xylene, trichloroethylene, and chloroform for 800-nm bore *** feasibility of the index sensing by our proposed NBF FBG is also analyzed and *** experimental fabrication of hollow and filled FBGs are discussed and can be achieved by current *** aim of this work is to establish a principle prototype for investigating the HCFs and solid-core FBGs-based fiber-optic platforms,which are useful for applications such as the simultaneous chemical and physical sensing at the same position.

关键词： nano-bore optical fiber fiber Bragg grating(FBG) hollow-core optical fiber(HCF) fiber optics

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