检索结果-南通市图书馆

Enhanced strength and electrical conductivity of Al-0.3Ce alloy simultaneously with Ti(C,N)nanoparticle addition

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第7期40卷 1890-1896页

作者： wan-peng Li Yu-Liang Zhang Jian Mao College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Ti(C,N)nanoparticles were added to an Al-0.3 Ce alloy by ultrasonic *** annealing at 570℃for4 h afforded the ultimate tensile strength of 79 MPa and electrical conductivity of 64.0%IACS for the Al-0.3 Ce alloy with1.5 vol%Ti(C,N)*** performance parameters were improved by 23.4%and 0.6%IACS,respectively,compared with those of casting refining pure aluminum(64 MPa and63.4%IACS).This could be explained by the following *** addition of Ti(C,N)nanoparticles could significantly refine the grain of Al-0.3 Ce ***,most of the coarse strip-shaped second phases distributed at the grain boundaries in Al-0.3 Ce were also transformed into spherical microparticles distributed in the grains,with micro-nano hierarchical structures comprising orientated nanosized strip phases with lengths of~400 nm and widths of~100 ***,a fine micro-nano hierarchical spherical structure could be obtained after annealing at 570℃for 4 *** numbers of micro-nano hierarchical spherical structures also increased due to the precipitation of pseudosolution Ce from the aluminum matrix during the annealing treatment.

关键词： Conductive aluminum alloy Ti(C,N)nanoparticles Ce Micro-nano hierarchical spherical structure Annealing treatment

Epiphyseal distraction and hybrid reconstruction using polymethyl methacrylate construct combined with free non-vascularized fibular graft in pediatric patients with osteosarcoma around knee: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第21期7卷 3632-3638页

作者： Yin-Hua Liang Hong-Bo He Can Zhang Yu-peng Liu jun wan Department of Orthopaedics Xiangya Hospital Central South University

BACKGROUND In children with osteosarcoma around the knee joint without epiphysis involvement,joint-sparing surgery seems to be an ideal way to retain knee joint ***,there are two points of debate with regard to the technique:How to accurately achieve a safe surgical margin,and how to achieve intercalary reconstruction of the massive bone defect following resection of the *** SUMMARY We present the case of an 8-year-old girl with osteosarcoma of the distal femur without involvement of the *** distraction was applied to separate the epiphysis and metaphysis,and this provided a safe surgical *** massive bone defect was reconstructed with a custom-made antibioticloaded polymethyl methacrylate(PMMA)construct combined with a free nonvascularized fibular *** months after surgery,bone union between the autograft and host bone was confirmed in both the proximal and distal femur by computer tomography(CT)***,considerable callus formation was found around the PMMA *** 28 mo of follow-up,there was no sign of recurrence or *** patient could walk without any aid and carry out her daily life activities *** In cases of osteosarcoma without epiphysis involvement,epiphyseal distraction can be easily applied to obtain a safe *** reconstruction with an antibiotic-loaded PMMA construct combined with a free non-vascularized fibular graft has the advantages of being easy to manufacture,less time-consuming to place,and less likely to get infected,while also ensuring bone *** case provides an alternative technique for biological reconstruction after joint-sparing surgery in patients with osteosarcoma around the knee without epiphyseal involvement.

关键词： Epiphyseal distraction Custom-made polymethyl methacrylate construct Non-vascularized fibular graft Osteosarcoma Case report

Comparison of the Pathogenicity of Neisseria meningitidis Isolates of Hyperinvasive Sequence Type 7 Belonging to Serogroups A,B,C,and X

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

Biomedical and Environmental Sciences 2020年第2期33卷 114-122页

作者： GUO peng Bo ZHU Bing Qing XU Li GAO wan Ying GAO Yuan LIANG Hao ZHANG Mao jun SHAO Zhu jun State Key Laboratory for Infectious Disease Prevention and Control National Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases Hangzhou 310003ZhejiangChina

Objective To compare the pathogenicity of isolates of sequence type 7(ST-7)Neisseria meningitidis(***)belonging to four different serogroups(A,B,C,and X).Methods Four ST-7 *** isolates serogrouped as A,B,C,and X and characterized by different capsule structures,were examined for their adhesion and invasion properties,and their ability to induce cytokine release and apoptosis in the host cell(the A549 cell line).Results Among the four ST-7 *** isolates,the serogroup A isolate possessed the strongest adhesion and invasion *** isolate also induced the release of the highest levels of the proinflammatory mediators interleukin-6,interleukin-1β,and interferon,and the highest apoptosis rate in the host ***,there was no significant difference in interleukin-8 and tumor necrosis factor-αsecretion between the four *** on the findings,the serogroup X *** isolate had the weakest pathogenicity,whereas there was almost no difference in the pathogenicity of the isolates from serogroups B and *** The differences in the capsular structure of the four isolates of ST-7 *** affected their pathogenic *** findings also imply that the hyperinvasive ST-7 *** lineage may include hypoinvasive isolates.

关键词： ST-7 N.meningitidis Capsule Pathogenicity Adaptation

Spatiotemporal pattern formation in parametrically driven two-dimensional Bose–Einstein condensates

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第12期76卷 150-156页

作者： jun wan Wen Wen Hui-jun Li College of Mechanics and Engineering Science Hohai University Institute of Nonlinear Physics and Department of Physics Zhejiang Normal University Zhejiang Institute of Photoelectronics and Zhejiang Institute for Advanced Light Source Zhejiang Normal University

We investigate spatiotemporal periodic patterns in harmonically trapped Bose–Einstein condensates(BECs) driven by a periodic modulation of the interaction. Resonant with the breathing mode, we show the emergence of a square lattice pattern containing two orthonormal stripes. We study the time evolutions of the lattice patterns for different driving strengths and dissipations. We find that its spatial periodicity and temporal oscillating frequency match the Bogoliubov dispersion, which is the intrinsic property of the system and relevant to the parametric amplification of elementary excitations. In the circumstances of strong driving strength and low dissipation, we further observe the triad interaction and the resulting superlattice state, which are well explained by the nonlinear amplitude equation for superimposed stripes. These results shed light on unexplored nonlinear spatiotemporal dynamics of two-dimensional patterns in harmonically trapped BECs that can pave the way for engineering exotic patterns by state-of-the-art experiments.

关键词： spatio-temporal periodicity square lattice pattern triad interaction

Development of re-crosslinkable dispersed particle gels for conformance improvement in extremely high-temperature reservoirs

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2022年第6期19卷 2922-2931页

作者： Dao-Yi Zhu Run-Tian Luo Yang Liu jun-Hui Qin Qi Zhao Hong-jun Zhang wan-Sheng wang Zi-Yuan wang Meng-En Zhu Yi-peng wang peng-Bo Li China University of Petroleum-Beijing at Karamay Karamay 834000XinjiangChina

Micro-scale and nano-scale dispersed gel particles(DPG)are capable of deep migration in oil reservoirs due to their deformability,viscoelasticity,and suitable particle ***,it has been widely studied and applied in reservoir conformance control in recent ***,for highly permeable channels,their plugging performance is still *** addition,conventional in situ cross-linked polymer gels(ISCPGs)have fast gelation time under extremely high-temperature conditions,which often causes problems such as difficulty in ***,a re-cross linkable dispersed particle gel(RDPG)system applied for conformance control in highly permeable channels of extremely high-temperature petroleum reservoirs was *** particle size distribution,gelation time,gel strength,injection performance,and perfo rmance strength in po rous media were investigated using a laser particle size meter,the Sydansk bottle test method,rheometer,and core displacement experiments,*** show that the RDPG suspension can be stable for more than 6 months at room temperature with storage modulus G’much lower than 10 *** can pass through the pore throat by elastic deformation effect and does not cause strong ***,it can undergo re-crosslinking reaction at 150℃to form a strong bulk *** gel strength G’of re-crosslinked RDPG can be as high as 69.3 Pa,which meets the strength requirement of conformance *** RDPG suspension has the properties of easy injection,and it also has strong plugging,and high-temperature resistance after re-crosslinked in the core,which can be a very promising material for conformance improvement in extremely high-temperature reservoirs.

关键词： Dispersed particle gel Re-crosslinking Conformance improvement High-temperature petroleum reservoir Injection performance

Rheological model of semisolid Mg_(2)Si/AM60 composites prepared by ultrasonic vibration treatment

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2022年第8期41卷 2783-2788页

作者： Yuan-Sheng Rao Hong Yan jun wan Department of Materials Processing Engineering School of Mechanical and Electrical EngineeringNanchang UniversityNanchang330031China Key Laboratory of Light Alloy Preparation and Processing in Nanchang City Nanchang330031China

The rheological behavior of semisolid Mg_(2)Si/AM60 composites prepared by ultrasonic vibration treatment was *** effects of primaryα-Mg solid content,the ultrasonic power and the content of reinforcement phase Mg_(2)Si on the apparent viscosity of semisolid composites were *** results show that the apparent viscosity of the semis olid composites increases with the increase in a-Mg solid ***,the apparent viscosity decreases with the increase in ultrasonic power,and the reduction amplitude is higher when the solid content is *** addition,the apparent viscosity increases with the increase in Mg_(2)Si *** on experimental data fitting,the rheological model of semisolid Mg_(2)Si/AM60 composites prepared by ultrasonic vibration was established.

关键词： Semisolid Magnesium matrix composites Ultrasonic vibration Apparent viscosity

High nitrogen nickel-free austenitic stainless steel:A promising coronary stent material

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第2期55卷 329-340页

作者： YANG Ke REN YiBin wan peng Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Currently commercialized coronary stents are mainly made of the medical 316L stainless steel and cobalt-based alloy(L605) due to their good combination of properties,especially excellent mechanical ***,the presence of high quantity of nickel and/or cobalt elements,the agents known to trigger the toxic and allergic responses,in these materials has caused many clinic *** potential adverse effect of nickel ions release has prompted the development of high nitrogen nickel-free austenitic stainless steels for medical *** in steel is not only to replace the nickel but also improve the properties of *** this paper,the harmfulness and release of nickel from metallic stents,and the advantages in mechanical properties and hemocompatibility of high nitrogen nickel-free stainless steels for coronary stents are *** from the highlight of nickel-free,the superiority of high strength and better hemocompatibility of high nitrogen nickel-free stainless steels can guarantee to manufacture thinner strut coronary stents with remarkable anticoagulation *** nitrogen nickel-free stainless steels as a promising coronary stents material will attract more and more clinical doctors and stents makers to bring them into clinical application.

关键词： high nitrogen steel nickel-free biocompatibility coronary stent restenosis

Combustion behavior and mechanism of molecular perovskite energetic material DAP-4-based composites with metal fuel Al

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第9期27卷 53-63页

作者： peng Deng Xue-yong Guo Hua Fang Rui Liu peng-wan Chen State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081PR China

Combined with the oxidizer anions and fuel cations,molecular perovskite energetic materials show a good *** this work,the combustion behavior and mechanism of metal fuel aluminium(Al)with molecular perovskite energetic material(H_(2)dabco)[NH4(ClO_(4))_(3)](DAP-4)as a high-energy oxidant was *** DAP-4 based composites with metal fuel Al were designed and fabricated by the different mass *** showed that DAP-4 exhibits a good oxygen-supplied capacity for enhancing the combustion performance of *** maximum combustion heat of DAP-4/Al-3 at the Al/O mass ratio of 38:62 is up to 10,412 J/g in the inert gas,which is higher than those of other ratios and the mixtures of other energetic materials and *** evolution of pressure output,pressurization rate,and flame temperature was monitored for DAP-4/Al with different mass *** DAP-4/Al/F were characterized by burning *** combustion reaction mechanism of metal fuel Al with DAP-4 as a high-energy oxidant was ***-4 was ignited firstly and released acid and oxidizing gases,which corroded Al_(2)O_(3)shells on Al particle surfaces and accelerated the combustion reaction with Al to release a lot of *** work offered a new idea that molecular perovskite energetic materials have great potential in the high-energy Al-based solid rocket propellants.

关键词： DAP-4 Metal fuel al Oxidant Combustion behavior Reaction mechanism

2D–3D dual carbon layer confined ultrasmall VN nanoparticles for improving lithium-ion storage in hybrid capacitors

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第1期43卷 65-75页

作者： Zhao-Wei Hu Hui-Fang Li peng wang wan-Li wang Lei Yang Xiao-jun wang Zhi-Ming Liu College of Electromechanical Engineering Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-MaterialsQingdao University of Science&TechnologyQingdao 266061China Research Center for Intelligent and Wearable Technology College of Textiles and ClothingQingdao UniversityQingdao 266071China

Lithium-ion capacitors(LICs) of achieving high power and energy density have garnered significant attention. However, the kinetics unbalance between anode and cathode can impede the application of LICs. Vanadium nitride(VN) with a high theoretical specific capacity(~ 1200 m Ah·g^(-1)) is a better pseudocapacitive anode to match the response of cathode in LICs. However, the insertion/extraction of Li-ions in VN's operation results in significant volume expansion. Herein, the VN/N-r GO-5composite that three-dimentional(3D) dicyandiamidederived-carbon(DDC) tightly wrapped VN quantum dots(VN QDTs) on two-dimentional(2D) reduced graphene oxid(r GO) was prepared by a facile strategy. The VN QDTs can reduce ion diffusion length and improve charge transfer kinetics. The 2D r GO as a template provides support for nanoparticle dispersion and improves electrical conductivity. The 3D DDC tightly encapsulated with VN QDTs mitigates agglomeration of VN particles as well as volume expansion. Correspondingly, the LICs with VN/Nr GO-5 composite as anode and activated carbon(AC) as cathode were fabricated, which exhibits a high energy density and power density. Such strategy provides a perspective for improving the electrochemical properties of LIC anode materials by suppressing volume expansion and enhancing conductivity.

关键词： Vanadium nitride(VN)quantum dots Reduced graphene oxide(rGO)nanosheets Dicyandiamide-derived-carbon 2D–3D dual carbon layer Lithium-ion capacitors