检索结果-南通市图书馆

Particuology 2016年第1期14卷 159-163页

作者： Xi Zhou Jian Mao zhen qiao College of Materials Science and Engineering Sichuan University No. 24 South Section 1 Yihuan Road. Chengdu 610064 Sichuan China

A copper coating was deposited by electroless plating on the surfaces of urea-formaldehyde microcap- sules containing paraffin （UFP） particles. This composite microcapsule structure had low infrared OR） emissivity and maintained a constant temperature, and could be used in IR stealth applications. The eiectroless copper layer formation and its micro-appearance, and the effect of the copper layer on the IR emissivity and thermal properties of the composite microcapsules were investigated. The IR emissivity of the composite microcapsules at wavelengths of 1-14 μm gradually decreased with increasing copper mass on the surface. After formation of an integrated copper layer, the rate of IR emissivity decrease was lower. This is because the copper coating improves the surface conductivity of the UFP; a high conductivity results in high reflectivity, which leads to a decrease in IR emissivity. The lowest IR emissivity achieved was 0.68. The phase-change enthalpy of the composite microcapsules decreased with increasing amount of copper coated on the surface because of the high density of copper. When the mass increase of the UFP after electroless copper plating was about 300%, the composite microcapsules had low IR emissivity （about 0.8） and a high phase-change enthalpy （80J/g）.

关键词： Phase-change material Urea-formaldehyde microcapsules containing paraffin particle Electroless copper plating Low infrared emissivity Enthalpy

Universal conductance fluctuations in Sierpinski carpets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of physics 2019年第6期14卷 89-95页

作者： Yu-Lei Han zhen-Hua qiao ICQD Hefei National Laboratory for Physical Sciences at MicroscaleSynergetic Innovation Center of Quantum Information and Quantum PhysicsCAS Key Laboratory of Strongly-Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China

We theoretically investigate the conductance fluctuation of two-terminal device in Sierpinski *** find that,for the circular orthogonal ensemble(COE),the conductance fluctuation does not display a universal feature;but for circular unitary ensemble(CUE)without time-reversal symmetry or circular symplectic ensemble(CSE)without spin-rotational symmetry,the conductance fluctuation can reach an identical universal value of 0.74+0.01(e^2/h).We further find that the conductance distributions around the critical disorder strength for both CUE and CSE systems share the similar distribution *** findings provide a better understanding of the electronic transport properties of the regular fractal structure.

关键词： electronic transport conductance fluctuation

Molten Salts Strategy for the Synthesis of CoP Nanoparticles Entrapped,N,P co-Doped Mesoporous Carbons as Electrocatalysts for Hydrogen Evolution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第1期38卷 237-242页

作者： XU Jing MIAO Sijia TANG Duihai ZHANG Wenting ZHAO zhen qiao zhen-An Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034P.R.China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012P.R.China

Amolten salt process was developed to prepare CoP nanoparticles(NPs) embedded, N,P co-doped carbons with the combination of hand milling and high temperature carbonization. The characterization results implied that the as-prepared samples possessed mesoporous structures. Moreover, the mass ratios of the precursors affected the crystalline structures and the porosities of the final electrocatalysts. The as-prepared catalysts exhibited excellent electrocatalytic performances towards hydrogen evolution reaction(HER) under acidic and alkaline conditions. The as-prepared samples were designed as GxMyCoz, where x, y and z meant the amounts of glucose, melamine and CoCl2, respectively. The optimum sample of G6.0M2.0Co5.0 showed the best HER property with a low onset overpotential and a small Tafel slope, as well as excellent electrocatalytic stability.

关键词： CoP nanoparticle Mesopore N P co-doped carbon Hydrogen evolution reaction Molten salt

Existence of the Uniform Attractors for the Nonautonomous Suspension Bridge Equations with Strong Damping

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 Mathematical Research and Exposition 2010年第2期30卷 277-285页

作者： qiao zhen MA College of Mathematics and Information Science Northwest Normal University Gansu 730070 P. R. China

In this paper we show the existence of the uniform attractors for the family of processes corresponding to the suspension bridge equations in H02 × L2 by a new concept of Condition （C＊） and the enegy estimats meth... 详细信息

关键词： suspension bridge equations uniform attractors Condition (C*) uniform condition(C).

Root carbon consumption and grain yield of spring wheat in response to phosphorus supply under two water regimes

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2016年第7期15卷 1595-1601页

作者： GUAN Yu qiao zhen DU Jiu-yuan DU Yan-lei Department of Resource and Environmental Science Agronomy College Shihezi University State Key Laboratory of Grassland Agro-ecosystem Institute of Arid Agroecology School of Life Sciences Lanzhou University Institute of Wheat Gansu Academy of Agricultural Sciences

In semiarid areas, cereal crops often alocate more biomass to root at the expense of aboveground yield. A pot experiment was conducted to investigate carbon consumption of roots and its impact on grain yield of spring wheat （Triticum aestivum L.） as affected by water and phosphorus （P） supply. A factorial design was used with six treatments namely two water regimes （at 80–75% and 50–45% ifeld capacity （FC）） and three P supply rates （P1=0, P2=44 and P3=109 μg P g–1 soil）. At shooting and lfowering stages, root respiration and carbon consumption increased with the elevate of P supply rates, regardless of water conditions, which achieved the minimum and maximum at P1 under 50–45% FC and P3 under 80–75% FC, respectively. However, total aboveground biomass and grain yield were higher at P2 under 80–75% FC; and decreased with high P application （P3）. The results indicated that rational or low P supply （80–75% of ifeld water capacity and 44 mg P kg–1 soil） should be recommended to improve grain yield by decreasing root carbon consumption in semiarid areas.

关键词： grain yield phosphorus supply rootcarbon consumption spring wheat water supply

Preparation of Amino-functionalized Guanidinium Ionic Liquid-Modified Magnetic Materials and Application in Solid-Phase Extraction of Pollutants in Water

在线全文

学校读者我要写书评

暂无评论

Journal of Analysis and Testing 2022年第4期6卷 401-410页

作者： Li-zhen qiao Chun-Mei Yu Rui-Ting Sun State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian116023China School of Chemical Engineering Dalian University of TechnologyPanjin124221China

In the present work,a novel amino-functionalized hexaalkylguanidinium chloride ionic liquid was prepared and grafted on the surface of magnetic materials through polyethyleneimine to enrich polycyclic aromatic hydrocarbons in water in combination with HPLC equipped with an ultraviolet *** effect of several parameters on the extraction efficiency was investigated,including the desorption solvent,the amounts of sorbents,the extraction time,the desorption time and the salt *** the optimized conditions,the method validation exhibited good linearity with correlation coefficients above 0.994 in the range of 0.2-300 ng/mL and low limits of detection and quantification of 0.05 and 0.2 ng/mL,***,relative recoveries were in the range of 80-120%,and the intra-day and inter-day repeatability were good with the relative standard deviations of less than 20%.Finally,the guanidinium ionic liquid modified magnetic materials were applied for the extraction of polycyclic aromatic hydrocarbons from real water samples to demonstrate the utility,and the results show that the proposed method has good prospect for effective enrichment and determination of pollutants in water.

关键词： Guanidinium ionic liquid Magnetic solid-phase extraction Amino-functionalized Polycyclic aromatic hydrocarbons

Polyaniline nanobelts, flower-like and rhizoid-like nanostructures by electrospinning

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第2期19卷 223-226页

作者： qiao zhen Yu Ying Li Mang Wang Hong zheng Chen Department of Polymer Science and Engineering State Key Lab of Silicon Materials Zhejiang University Hangzhou 310027 China Key Laboratory of Macromolecule Synthesis and Functionalization （Zhejiang University） Ministry of Education Hangzhou 310027 China Jiaxing University Jiaxing 314001 China

Nanobelts, flower-like and rhizoid-like nanostructures of pure polyaniline （PANI） doped with sulfuric acid or hydrochloric acid were prepared via electrospinning by using a coagulation bath as the collector after optimizing the fabrication parameters. The morphologies of these nanostructures were characterized by scanning electron microscope （SEM）. The possible formation mechanisms were discussed.

关键词： Electrospinning Nanostructures Polyaniline Formation mechanisms

Deep eutectic solvent assisted facile synthesis of low-dimensional hierarchical porous high-entropy oxides

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第3期15卷 2756-2763页

作者： Jiale Wei Kai Rong Xiaolong Li Yuchen Wang zhen-An qiao Youxing Fang Shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Science and Technology of China Hefei 230026China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry International Joint Research Laboratory of Nano-Micro Architecture ChemistryCollege of ChemistryJilin University2699 Qianjin StreetChangchun 130012China

High-entropy-oxides(HEOs),a new class of solids that contain five or more elemental species,have attracted increasing interests owing to their unique structures and fascinating physicochemical ***,it is a huge challenge to construct various nanostructured,especially low-dimensional nanostructured HEOs under the high temperature synthetic ***,a facile strategy using glucose-urea deep eutectic solvent(DES)as both a solvent and the carbon source of structure-directed template is proposed for the synthesis of various HEOs with two-dimentional(2D)nanonets and one-dimentional(1D)nanowires,including rock-salt(Co,Cu,Mg,Ni,Zn)O,spinel(Co,Cr,Fe,Mn,Ni)_(3)O_(4),and perovskite La(Co,Cr,Fe,Mn,Ni)O_(3).The as-prepared HEOs possessed five or more uniformly dispersed metal elements,large specific surface areas(more than 25 m^(2)·g^(−1)),and a pure single-phase *** addition,high cooling rate(cooling in air or liq-N_(2)-quenching)was indispensable to obtain a single-phase rock-salt(Co,Cu,Mg,Ni,Zn)O because of phase separation caused by *** taking advantage of unique features of HEOs,rock-salt(Co,Cu,Mg,Ni,Zn)O can function as a promising candidate for lithium-ion batteries(LIBs)anode material,which achieved excellent cycling *** work provides a feasible synthetic strategy for low-dimensional hierarchical HEOs,which creates new opportunities for the stable HEOs being highly active functional materials.

关键词： high-entropy oxide deep eutectic solvent one-/two-dimentional(1D/2D)hierarchical structure lithium-ion battery

Rehabilitation care for pain in elderly knee replacement patients

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第4期12卷 721-728页

作者： Li Liu qiao-zhen Guan Li-Fang Wang Wuhan Fourth Hospital Wuhan 430033Hubei ProvinceChina Department of Orthopaedics Wuhan Third HospitalWuhan 430074Hubei ProvinceChina

BACKGROUND Total knee arthroplasty(TKA)is recognized as the most effective surgical intervention for relieving pain and improving joint mobility and deformity in patients with knee osteoarthritis and other synovial *** application of accelerated postoperative rehabilitation(enhanced recovery after surgery)has demonstrated its efficacy in improving patient outcomes,and early postoperative joint function exercise has become a key prognostic factor in knee *** unexpected appearance of limb pain and swelling hindered the patient’s tendency for early mobilization,leading in prolonged hospitalization,delayed functional recovery and negative psychological responses.A retrospective analysis was conducted on a cohort of 116 patients who under-went TKA at our hospital between July 2019 and July *** patients were divided into two groups:A control group(n=58)receiving programmatic nur-sing,and an observed group(n=58)receiving programmed nursing combined with a collaborative nursing model.A pain management team consisting of attending physicians,head nurses,and responsible nurses was *** measures included visual analogue scale(VAS)scores,activities of daily living(ADL)scale scores,and functional *** ADL scores of patients in both groups exhibited a continuous ***,there was no statistically significant difference in the ADL scores between the two groups at 48 h and the 7th d post-surgery(P>0.05).Upon reexamination at the 3rd mo,the observation group demonstrated higher ADL scores compared to the control group(67.48±14.69 vs 59.40±16.06,P0.05).The functional status of patients in both groups exhibited a gradual increase prior to intervention and at the 1st,2nd,and 3rd month following discharge(P<0.05).There was no statistically significant difference in knee joint function scores b

关键词： Programmed pain nursing Collaborative nursing Total knee arthroplasty

Reshaping force for deformed casing repairing with hydraulic rolling reshaper and its influencing factors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2745-2757页

作者： Hong-Fei Li Min Luo Ting-Ting Xu qiao-zhen Li Cong-Jian Huang School of Mechanical Science and Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangChina

Hydraulic rolling reshaper is an advanced reshaping tool to solve the problem of casing deformation,which has been widely used in recent *** it is used for well repair operation,the reshaping force provided by ground devices is generally determined by ***,too large reshaping force may destroy the deformed casing,and too small reshaping force may also prolong the construction period and affect the repairing *** this paper,based on Hertz contact theory and elastic-plastic theory,combined with the process parameters of shaping,and considering the structural characteristics of the deformed casing and reshaper,we propose a mathematical model for calculating the reshaping force required for repairing deformed casing by hydraulic rolling ***,the finite element model and numerical method of hydraulic rolling reshaper repairing deformed casing are established by using the finite element method,and the reliability of the mathematical model is verified by several *** this basis,the control variable method is used to investigate the influence of each parameter on the reshaping force,and the influence degree of each parameter is explored by orthogonal simulation test and Pearson correlation *** research results not only provide an important theoretical basis for the prediction of reshaping force in on-site construction,but also provide a reference for the subsequent improvement of the shaping process.

关键词： Hydraulic rolling reshaper Reshaping force Deformed casing Casing reshaping Hertz contact theory