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The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty

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journal of Zhejiang University Science 2004年第10期5卷 1270-1278页

作者：吴立东 HAHNEH.j. HASSENPFLUGj. DepartmentofOrthopedics SecondAffiliatedHospitalCollegeofMedicineZhejiangUniversityHangzhou310009China OrthopaedicHospitalofKielUniversity Kiel24105Germany

Objective: To observe the accuracy of femoral preparation and the position of the cementless prosthesis in femoral cavity, and to compare the results between the computer-assisted surgical group (CASPAR) and the conventional group. Methods: Ten femoral components were implanted either manually or by CASPAR in cadaver femurs. The specimens were cut to 3mm thick slices. Microradiograms of every slice were sent to a computer for analysis with special software (IDL). The gaps and the medullary cavities between component and bone, the direct bone contact area of the implant surface, the gap width and the percentage of gap and bone contact area were measured in every slice. Results: In the proximal implant coated with HA of the CASPAR group, the average percentage of bone contact reached 93.2% (ranging from 87.6% to 99.7%); the average gap percentage was 2.9% (ranging from 0.3% to 7.8%); the maximum gap width was 0.81mm and the average gap width was only 0.20mm. While in the conventional group, the average percentage of bone contact reached 60.1% (ranging from 49.2% to 70.4%); the average gap percentage was 32.8% (ranging from 25.1% to 39.9%); the maximum gap width was 2.97mm and the average gap width was 0.77mm. The average gap around the implant in the CASPAR group was only 9% of that in the manual group; the maximum and average gap widths were only about 26% of those in the manual group. On the other hand, the CASPAR group showed 33% higher bone contact than the manual group. Conclusion: With the use of robotics-assisted system, significant progress can be achieved for femoral preparation in total hip arthroplasty.

关键词： Total hip arthroplasty Femoral cavity preparation Robotics-assisted surgery

One kind motion of controllable constrained Birkhoffian system:the absence of constraints

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Acta Mechanica Sinica 2020年第3期36卷 735-741页

作者： j.Chen F.X.Mei S.X.Liu Y.X.Guo School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China School of Physics Liaoning UniversityShenyang 110000China

This paper is devoted to discuss the motion of controllable constrained Birkhoffian system along with its absence of *** first step is to establish the autonomous and non-autonomous differential equations of motion of the system,based on Pfaff-Birkhoff ***,the existence of constraint multipliers are exhaustively ***,the definition of one kind motion of the system,called free motion,is given,which is described and analyzed by the absence of constraints that are determined by constraint *** 2 illustrates that one system can realize its free motion by selecting proper control *** particular,theorem 2 provides that one system can naturally realize free motion when we consider the integral of the unconstrained Birkhoffian system as the constraints of constrained Birkhoffian ***,the results obtained are illustrated by several examples.

关键词： Constrained Birkhoffian system Kinematic control Absence of constraint Free motion

Intelligent Energy Utilization Analysis Using IUA-SMD Model Based Optimization Technique for Smart Metering Data

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A culture model to analyze the acute biomaterial-dependent reaction of human primary neutrophils in vitro

哈尔滨工业大学学报（英文版） 2024年第1期

作者： K.Rama Devi V.Srinivasan G.Clara Barathi Priyadharshini j.Gokulapriya

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生物活性材料(英文) 2023年第2期20卷 627-637页

作者： Marinus A.Wesdorp Andrea Schwab Ezgi Irem Bektas Roberto Narcisi David Eglin Martin j.Stoddart Gerjo j.V.M.Van Osch Matteo D’Este AO Research Institute Davos AO FoundationDavos PlatzSwitzerland Department of Orthopaedics and Sports Medicine Erasmus MCUniversity Medical Center Rotterdamthe Netherlands Mines Saint-Étienne Univ LyonUniv Jean MonnetINSERMU1059 SainbioseSaint-ÉtienneFrance Department of Biomaterials Science and Technology University of TwenteEnschedethe Netherlands Department of Otorhinolaryngology Erasmus MCUniversity Medical Center Rotterdamthe Netherlands Department of Biomechanical Engineering Faculty of MechanicalMaritimeand Materials EngineeringDelft University of Technologythe Netherlands Department of Oral and Maxillofacial Surgery Erasmus MCUniversity Medical Center Rotterdamthe Netherlands

Neutrophils play a pivotal role in orchestrating the immune system response to biomaterials,the onset and resolution of chronic inflammation,and macrophage ***,the neutrophil response to biomaterials and the consequent impact on tissue engineering approaches is still scarcely ***,we report an in vitro culture model that comprehensively describes the most important neutrophil functions in the light of tissue *** isolated human primary neutrophils from peripheral blood and exposed them to a panel of hard,soft,naturally-and synthetically-derived *** overall trend showed increased neutrophil survival on naturally derived constructs,together with higher oxidative burst,decreased myeloperoxidase and neutrophil elastase and decreased cytokine secretion compared to neutrophils on synthetic *** culture model is a step to better understand the immune modulation elicited by *** studies are needed to correlate the neutrophil response to tissue healing and to elucidate the mechanism triggering the cell response and their consequences in determining inflammation onset and resolution.

关键词： inflammation healing culture

Phosphogypsum stabilization of bauxite residue:Conversion of its alkaline characteristics

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journal of Environmental Sciences 2019年第3期31卷 1-10页

作者： Shengguo Xue Meng Li jun jiang Graeme j.Millar Chuxuan Li Xiangfeng Kong School of Metallurgy and Environment Central South University Institute for Future Environments Science and Engineering Faculty Queensland University of Technology

Reduction of the high alkalinity of bauxite residue is a key problem to solve to make it suitable for plant growth and comprehensive utilization. In this study, phosphogypsum, a waste product from the phosphate fertilizer industry, was used to drive the alkaline transformation of the bauxite residue. Under optimal water washing conditions(liquid/solid ratio of 2 mL/g, 30°C, 24 hr), the impact of quantity added, reaction time and reaction mechanism during phosphogypsum application were investigated. Phosphogypsum addition effectively lowered p H levels and reduced the soluble alkalinity by 92.2%. It was found that the concentration of soluble Na and Ca ions in the supernatant increased gradually, whilst the exchangeable Na+and Ca^(2+)in solid phase changed 112 mg/kg and 259 mg/kg, respectively. Ca^(2+)became the dominant element in the solid phase(phosphogypsum addition of 2%, liquid/solid ratio of 2 mL/g, 30°C, 12 hr). X-ray diffraction data indicated that cancrinite and hydrogarnet were the primary alkaline minerals. SEM images suggested that phosphogypsum could promote the formation of stable macroaggregates, whilst the content of Ca^(2+)increased from 5.6% to 18.2% and Na reduced from 6.8% to 2.4%. Treatment with phosphogypsum could significantly promote the transformation of alkalinity cations by neutralization, precipitation and replacement *** research provided a feasible method to promote soil formation of bauxite residue by phosphogypsum amendment.

关键词： Bauxite residue Phosphogypsum Alkaline ions Alkaline transformation Soil formation

Effect of sample size on the response of DEM samples with a realistic grading

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Particuology 2014年第4期12卷 107-115页

作者： Xin Huang Kevin j.Hanley Catherine O'Sullivan Fiona C.Y.Kwok Skempton Building Department of Civil and Environmental EngineeringImperial College LondonLondon SW7 2AZUnited Kingdom Haking Wong Building Department of Civil EngineeringThe University of Hong Kong

This paper shows that for DEM simulations of triaxial tests using samples with a grading that is repre- sentative of a real soil, the sample size significantly influences the observed material response. Four DEM samples with identical initial states were produced： three cylindrical samples bounded by rigid wails and one bounded by a cubical periodic cell, When subjected to triaxial loading, the samples with rigid boundaries were more dilative, stiffer and reached a higher peak stress ratio than the sample enclosed by periodic boundaries. For the rigid-wall samples, dilatancy increased and stiffness decreased with increasing sample size, The periodic sample was effectively homogeneous, The void ratio increased and the contact density decreased close to the rigid walls, This heterogeneity reduced with increasing sample size. The positions of the critical state lines （CSLs） of the overall response in e-log p＇ space were sensitive to the sample size, although no difference was observed between their slopes. The critical states of the interior regions of the rigid-wall-bounded samples approached that of the homogeneous periodic sample with increasing sample size. The ultimate strength of the material at the critical state is independent of sample size.

关键词： Discrete element method Sample size Rigid boundary Periodic boundary Critical state

Numerical Study of an Annular Gas Turbine Combustor with Dump Diffuser

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journal of Thermal Science 1999年第1期8卷 59-64页

作者： j.X.Zhao Y.B.Lai DepartmentofPowerEngineering NanjingUniversityofAeronauticsandAstronautics210016NanjingChina Depar

A general numerical method is presented for calculating steady three-dimensional and two-phase turbulent reactive flows with a nonstaggered body-fitted coordinate system in an annular gas turbine combustor with the dump diffuser. The modified two-equation model and the EDC turbulent combustion model are used for the gas phase. The liquid phase equations are solved in a Lagrangian frame of reference by PSIC algorithm. The effect of different velocity profiles at the entry of the prediffuser on combustor flow characteristics is calculated.

关键词： numerical simulation annular combustor dump diffuser 3D body-fitted coordinate two phase combustion.

Crystallographic Analysis of Isothermally Transformed Bainite in 0.2C-2.0Mn-1.5Si-0.6Cr Steel Using EBSD

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journal of Materials Science & Technology 2013年第4期29卷 359-366页

作者： Pasi P.Suikkanen Cyril Cayron Anthony j.DeArdo L.Pentti Karjalainen Ruukki Metals Oy Rautaruukintie 155P.O.Box 93FI-92101 RaaheFinland Department of Mechanical Engineering University of OuluP.O.Box 420090014 University of OuluFinland Ruukki Metals Oy Rautaruukintie 155P.O.Box 93FI-92101 RaaheFinland. CEA LITEN17 rues des Martys38054 GrenobleFrance Department of Mechanical Engineering and Materials Science University of Pittsburgh848 Benedum HallPittsburghPA 15261-2285USA

The crystallography of bainite, transformed isothermally at 450 ℃ in 0.2C-2.0Mn-1.5Si-0.6Cr steel, was investigated by electron backscatter diffraction （EBSD） analysis. The orientation relationship （OR） was found to be closer to Nishiyama-Wassermann （N-W） than Kurdjumov-Sachs orientation relationship. Bainite microstructure consisted of parallel laths forming a morphological packet structure. Typically, there were three different lath orientations in a morphological packet. These orientations were dictated by a three specific N-W OR variants sharing the same {111} austenite plane. A packet of bainite laths with common {111} austenite plane was termed as crystallographic packet. Generally, the crystallographic packet size corresponded to the morphological packet size. Locally, crystallographic packets with only two dominant orientations were observed. This indicates strong local variant selection during isothermal bainite transformation. The relative orientation between the variants in crystallographic packets was found to be near 60°/〈110〉. This appears to explain the strong peak observed in the grain boundary misorientation distribution near 60°. Bainite also contained pronounced fraction of boundaries with their misorientation in the range of 2.5°-8° with quite widely dispersed rotation angles. Spatially these boundaries were found to locate inside the bainite laths, forming lath-like sub-grains.

关键词： Bainite Austenite Nishiyama-Wassermann orientation relationship Electron backscatter diffraction OEBSD) Crystallography Packet

The effect of particle size and amount of inoculum on fungal treatment of wheat straw and wood chips

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journal of Animal Science and Biotechnology 2017年第1期8卷 217-225页

作者： Sandra j. A. van Kuijk Anton S. M. Sonnenberg johan j. P. Baars Wouter H. Hendriks john W. Cone Animal Nutrition Group Wageningen University De Elst 1 6708WD Wageningen The Netherlands Plant Breeding Wageningen University Droevendaalsesteeg 1 6708PB Wageningen The Netherlands

Background： The aim of this study was to optimize the fungal treatment of lignocellulosic biomass by stimulating the colonization. Wheat straw and wood chips were treated with Ceriporiopsis subvermispora and Lentinula edodes with various amounts of colonized millet grains（0.5, 1.5 or 3.0 % per g of wet weight of substrate） added to the substrates. Also, wheat straw and wood chips were chopped to either 0.5 or 2 *** of the fungal treatment after 0, 2, 4, 6, or 8 wk of incubation was determined by changes in chemical composition, in vitro gas production（IVGP） as a measure for rumen degradability, and ergosterol content as a measure of fungal ***： Incomplete colonization was observed for C. subvermispora treated wheat straw and L. edodes treated wood chips. The different particle sizes and amounts of inoculum tested, had no significant effects on the chemical composition and the IVGP of C. subvermispora treated wood chips. Particle size did influence *** treatment of wheat straw. The L. edodes treatment of 2 cm wheat straw resulted in a more selective delignification and a higher IVGP than the smaller particles. Addition of 1.5 % or 3 % L. edodes inoculum to wheat straw resulted in more selective delignification and a higher IVGP than addition of 0.5 % ***： Particle size and amount of inoculum did not have an effect on C. subvermispora treatment of wood chips. At least 1.5 % L. edodes colonized millet grains should be added to 2 cm wheat straw to result in an increased IVGP and acid detergent lignin（ADL） degradation.

关键词： Amount of inoculum Fungal treatment In vitro rumen degradability Lignin degradation Lignocellulosic biomass Particle size