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Spacing graphene and Ni-Co layered double hydroxides with polypyrrole for high-performance supercapacitors

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Journal of Materials Science & Technology 2020年第20期52卷 190-197页

作者： Jing Liang Cuili Xiang Yongjin Zou xuebu Hu Hailiang Chu Shujun Qiu fen xu Lixian Sun Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China Chongqing University of Technology College of Chemistry&Chemical EngineeringChongqing 400054China

The urgent need of high-performance of energy storage devices triggers us to design newly class of ***,the materials feature with high conductivity,abundant pore s and excellent ***,a sandwiched hybrid composite containing reduced graphene oxide,polypyrrole and Ni-Co layered double hydroxides(RGO/PPy/NiCo-LDH) was prepared in a facile *** polypyrrole was incorporated in the two dimensional(2D) nanosheets,which not only serve as the spacer to increase the surface area,but also enhance the conductivity of the *** obtained architecture was employed as an advanced electrode in a *** electrode shows an ultrahigh specific capacitance(2534 F g^-1 at 1 A g^-1) and good cycling efficiency(78 % after 5000 cycles).Moreover,an asymmetric cell based RGO/PPy/NiCo-LDH composite demonstrates excellent electrochemical properties and good prospect of practical use.

关键词： Graphene Ni-Co layered double hydroxides Polypyrrole Supercapacitor Porous carbon

Quantum interferometry via a coherent state mixed with a squeezed number state

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Chinese Physics B 2019年第4期28卷 196-201页

作者： Li-Li Hou Yong-Xing Sui Shuai Wang xue-fen xu School of Mathematics and Physics Jiangsu University of Technology Department of Fundamental Courses Wuxi Institute of Technology

We theoretically investigate the phase sensitivity with parity measurement on a Mach–Zehnder interferometer with a coherent state combined with a squeezed number state. Within a constraint on the total mean photon number, we find, via parity measurement, that the mixing of a coherent state and squeezed number state can give better phase sensitivity than mixing a coherent state and squeezed vacuum state when the phase shift deviates from the optimal phase φ= 0. In addition,we show that the classical Fisher information for parity measurement saturates the quantum Fisher information when the phase shift approaches to zero. Thus, the quantum Crame′r–Rao bound can be reached via the parity measurement in the case of φ= 0.

关键词： quantum optics phase sensitivity quantum metrology

Stabilized multifunctional phase change materials based on carbonized Cu-coated melamine foam/reduced graphene oxide framework for multiple energy conversion and storage

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Carbon Energy 2022年第6期4卷 1214-1227页

作者： Zhicong Hu Yongjin Zou Cuili Xiang Lixian Sun fen xu Menghe Jiang Sensen Yu Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilinGuangxiPR China Guangxi Collaborative Innovation Center of Structure and Property for New Energy Materials GuilinGuangxiPR China

The leakage of organic phase change materials(OPCMs)at temperatures above their melting point severely limits their large-scale *** introduction of porous supports has been identified as an efficient leakageproofing *** this study,a novel carbonized Cu-coated melamine foam(MF)/reduced graphene oxide(rGO)framework(MF/rGO/Cu-C)is constructed as a support for fabricating stabilized multifunctional *** serves as the supporting material,while rGO and Cu act as functional *** a thermal energy storage material,polyethylene glycol(PEG)is encapsulated into MF/rGO/Cu-C through a vacuum-assisted impregnation method to obtain PEG@MF/rGO/Cu-C composite with excellent comprehensive ***@MF/rGO/Cu-C exhibits high phase change enthalpies of 148.3 J g^(-1)(melting)and 143.9 J g^(-1)(crystallization),corresponding to a high energy storage capability of 92.7%.Simultaneously,MF/rGO/Cu-C endues the composite with an enhanced thermal conductivity of 0.4621Wm^(-1) K^(-1),which increases by 463%compared to that of PEG@***,PEG@MF/rGO/Cu-C displays great light-to-thermal and electric-to-thermal conversion capabilities,thermal cycle stability,light-tothermal cycle stability,and shape stability,showing promising application prospects in different aspects.

关键词： Cu-coated network melamine foam PEG reduced graphene oxide stabilized multifunctional phase change materials

Encapsulation of hollow Cu_(2)O nanocubes with Co_(3)O_(4)on porous carbon for energy-storage devices

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Journal of Materials Science & Technology 2020年第20期52卷 182-189页

作者： Yongjin Zou Xi Zhang Jing Liang Cuili Xiang Hailiang Chu Huanzhi Zhang fen xu Lixian Sun Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004China

Co3 O4 is one of the most studied transition-metal oxides for use in energy-storage ***,its poor conductivity and stability limit its *** this study,a facile method for anchoring Co3 O4-encapsulated Cu2 O nanocubes on porous carbon(PC) to form Cu2 O@Co3 O4/PC was *** Cu2 O@Co3 O4/PC composite exhibited superior electrochemical performance as a supercapacitor electrode *** resultant supercapacitor delivered high specific capacitance(1096 F g^-1 at 1 A g^-1),high rate capability(83 % retention at 10 A g^-1),and excellent cycling stability(95 % retention of initial capacitance after 3000 cycles).Moreover,an asymmetric supercapacitor fabricated by coupling a Cu2 O@Co3 O4/PC positive electrode with a reduced graphene oxide negative electrode exhibited high energy density(32.1 W h kg^-1 at 700 W kg^-1).Thus,our results demonstrate that Cu2 O@Co3 O4/PC is a promising electrode material for energy-storage devices.

关键词： Cu_(2)O Co_(3)O_(4) Hollow nanocube Graphene Composite

Correlation between CK18 gene and gastric carcinoma micro metastasis

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World Journal of Gastroenterology 2005年第41期11卷 6530-6534页

作者： Wei xu Ming-Wei Zhang Jing Huang Xin Wang Shu-fen xu Yan Li Shu-Jie Wang Department of Laboratory The First Hospital Of JilinUniversity Changchun 130021 Jilin Province China Department of General Surgery The Second Hospital of Jilin University Changchun 130041 Jilin ProvinceChina

AIM: To explore the biological behavior of gastric carcinoma micrometastasis (MM) with a marker of cytokeratin 18 (CK18) and to evaluate the clinical stage of gastric carcinoma and its prognosis. METHODS: Reverse transcription-polymerase chain reaction (RT-PCR) was used to examine the expression of CK18 mRNA in 298 lymph nodes from 35 patients with gastric carcinoma and 20 lymph nodes from 10 patients with chronic peptic ulcer and gastric perforation diagnosed by pathological examination and ***18 mRNA expression of peripheral blood from 54 patients with gastric carcinoma and 10 healthy people were also ***: Expression of CK18 mRNA was not found in 10 patients with benign pathological ***18 mRNA expression in gastric carcinoma tissues was strongly positive. In gastric carcinoma patients,pathological examination revealed that 99 of 298 (33.2%)lymph nodes were positive, while RT-PCR showed that 133 of 298 (44.6%) lymph nodes had expression of CK18 mRNA. The difference was significant (P＜0.05).Among the 199 negative lymph nodes identified by pathological examinations, 34 (17.1%) displayed positive expression of CK18 mRNA by RT-PCR. The positive expression of CK18 mRNA was associated with lymph node micrometastasis (LMM) of gastric carcinoma. CK18 mRNA was negatively expressed in all 10 healthycases and positively expressed in 38.9% of 54 blood specimens from gastric carcinoma patients. The positive rate was not correlated with tumor invasion of gastric carcinoma,but was significantly associated with TNM stage, lymph node metastasis (P=0.0290, P＜ 0.05) and tumor differentiation (P= 0.2956, P＜0.05).CONCLUSION: RT-PCR with CK18 mRNA as a molecular marker is highly sensitive and specific in detecting LMM of gastric carcinoma. It can benefit the diagnosis of MM and guide studies on biological behavior, clinical phase,and therapy as well as relapse monitoring.

关键词： Gastric carcinoma CK18 RT-PCR Biological behavior

Microstructure and storage properties of low V-containing Ti–Cr–V hydrogen storage alloys prepared by arc melting and suction casting

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Rare Metals 2013年第4期32卷 354-358页

作者： Hai-Bin Wang Qing Wang Chuang Dong fen xu Li-Xian Sun Chong-Lin Chen Key Laboratory of Materials Modification Ministry of Education Dalian University of Technology Materials and Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Department of Physics and Astronomy University of Texas at San Antonio

The microstructure and hydrogen storage properties of low V content （Ti0.46Cr0.54）100-xVx （x = 2.5-7.1, at%） and （TiyCr1-y）95V5 （y= 0.38-0.54） alloys were investigated. These alloys were prepared by arc melting and copper mould suction casting. The structures of as-cast （Ti0.46Cr0.54）100-xVx （x = 2.5, 5.0, and 7.1） alloy ingots evolve with V contents from pure Laves-（x = 2.5） to dual-phase TiCr2-BCC structures （5.0 and 7.1）, whereas the suction-cast （Ti0.46Cr0.54）100-xVx （x =2.5, 5.0, and 7.1） alloys only contain single BCC phase. The suction-cast alloy rod （Ti0.46Cr0.54）95V5, containing only 5.0 at% V is shown to possess the optimum hydrogen absorption capacity, with the maximum hydrogen content of 3.14 wt%. Furthermore, the hydrogen storage properties of the suction-cast low V alloys （TiyCr1-y）95V5 （y = 0.38-0.54） are sensitive to Ti/Cr ratios and only those alloys with Ti/Cr ratios close to the CN14 cluster [TiTCrs] have good hydrogen storage properties.

关键词： Ti-Cr-V alloys Cluster Hydrogen storageproperties Copper mould suction casting

Nutritional compositions of various potato noodles:Comparative analysis

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 218-225页

作者： xu fen Hu Honghai Dai Xiaofeng Liu Qiannan Huang Yanjie Zhang Hong Institute of Food Science and Technology Chinese Academy of Agricultural Sciences/Comprehensive Key Laboratory of Agro-products ProcessingMinistry of AgricultureBeijing 100193China College of Staple Food Technology Institute of Food Science and TechnologyChinese Academy of Agricultural SciencesHarbin 151900China

In this study,three kinds of noodles,wheat,Shepody potato and Atlantic potato noodles,were produced with blended powder consisting of wheat flour and certain amounts of various potato *** order to investigate the effects of potato flour on the nutritional characteristics of noodles,the nutrient compositions of four types of noodles were analyzed:fresh noodle,dried noodle,fresh noodle after boiling,and dried noodle after *** showed that the contents of protein,crude fiber,total ash,reducing sugar,vitamin B1,vitamin B2,vitamin B3,vitamin C,most mineral elements,dietary fiber,and amino acids in potato noodles were higher than those in wheat ***,drying and boiling could decrease the contents of vitamin B1,vitamin B3,and mineral elements in noodles,but the nutrient contents in potato noodles remained higher than those in wheat *** comprehensive nutritional values of noodles were evaluated using the index of nutritional quality,the results showed that the nutritional value of Shepody potato noodles was the highest,followed by that of Atlantic potato noodles and then wheat noodles.

关键词： potato noodles nutritional composition nutritional value

Identification of the flavor profiles of Chinese pancakes from various areas using smart instruments combined with E-noses and E-tongues

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International Journal of Agricultural and Biological Engineering 2023年第1期16卷 283-290页

作者： Wei Liu Yue Fan Qiannan Liu fen xu Liang Zhang Honghai Hu Institute of Food Science and Technology Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products ProcessingMinistry of Agriculture and Rural AffairsBeijing 100193China

In order to reveal the flavor characteristics of Chinese pancakes,the aroma and taste compounds of seven traditional Chinese pancakes were *** results showed that electronic nose(E-nose)analysis with PCA could successfully distinguish the aroma profiles of seven Chinese pancakes;the principal components PC1 and PC2 represented 75.74%and 23.2%of the total variance(98.94%)***,the discrimination index of taste profiles of seven Chinese pancakes based on electronic tongue(E-tongue)analysis with LDA was 99.32%;the discriminant factors DF1 and DF2 represented 94.99%and 4.33%of the total variance ***,GC-MS results demonstrated that thirty-threeﬂavor compounds were identiﬁed in seven Chinese pancakes,including aldehydes,alcohols,alkanes,acids,and *** the flavor components,aldehydes with ROAVs higher than 1 contributed most significantly to the overall aroma,such as(E,E)-2,4-nonadienal present the largest contribution in Qingzhou pancake,Jinan and Yishui pancake;hexanal present the largest contribution in Shenxian and Gaomi pancake;nonanal and benzeneacetaldehyde present the largest contribution in Linqu and Tai’an pancake,*** umami and sweet taste amino acids were the most abundant in all the Chinese pancake samples,and Qingzhou pancake had relatively high amino acid *** content of glucose was higher than maltose in Gaomi,Shenxian,and Tai’an pancakes,whereas the content of maltose was higher than glucose in Linqu,Qingzhou,Jinan,and Yishui *** results indicated that the aroma and taste proﬁles of Chinese pancakes differed significantly in terms of their flavor compound *** presented results could be beneficial for providing a comprehensive method for flavor profile identification of traditional whole-grain-based staples such as Chinese pancakes.

关键词： Chinese pancake flavor profile E-nose E-tongue smart instrument identification

Understanding the dehydrogenation properties of Mg(0001)/MgH_(2)(110)interface from first principles

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Materials Reports(Energy) 2024年第1期4卷 89-94页

作者： Jianchuan Wang Bo Han Zhiquan Zeng Shiyi Wen fen xu Yong Du State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083PR China Powder Metallurgy Research Institute Central South UniversityChangsha410083PR China Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin541004PR China

Magnesium hydride is one of the most promising solid-state hydrogen storage materials for on-board *** desorption from MgH_(2) is accompanied by the formation of the Mg/MgH_(2) interfaces,which may play a key role in the further dehydrogenation *** this work,first-principles calculations have been used to understand the dehydrogenation properties of the Mg(0001)/MgH_(2)(110) *** is found that the Mg(0001)/MgH_(2)(110) interface can weaken the Mg-H *** removal energies for hydrogen atoms in the interface zone are significantly lower compared to those of bulk MgH_(2).In terms of H mobility,hydrogen diffusion within the interface as well as into the Mg matrix is *** calculated energy barriers reveal that the migration of hydrogen atoms in the interface zone is easier than that in the bulk MgH_(2).Based on the hydrogen removal energies and diffusion barriers,we conclude that the formation of the Mg(0001)/MgH_(2)(110) interface facilitates the dehydrogenation process of magnesium hydride.

关键词： Magnesium hydrides First-principles calculation Hydrogen storage materials Interface Hydrogen desorption