341   Mechanical properties of ceria nanorods and nanochains; The effect of dislocations, grain-boundaries and oriented attachment Mechanical properties of ceria nanorods and nanochains; The effect of dislocations, grain-boundaries and oriented attachment    2011 We predict that the presence of extended defects can reduce the mechanical strength of a ceria nanorod by 70%. Conversely, the pristine material can deform. near its theoretical strength limit. Specifically, atomistic models of ceria nanorods have been generated with full microstructure, including: growth direction, morphology, surface roughening (steps, edges, corners), point defects, dislocations and grain-boundaries. The models were then used to calculate the mechanical strength as a function... 查看全文

342   Electrochemical Desorption of n-Alkylthiol SAMs on Polycrystalline Gold:  Studies Using A Ferrocenylalkylthiol Probe† Electrochemical Desorption of n-Alkylthiol SAMs on Polycrystalline Gold:  Studies Using A Ferrocenylalkylthiol Probe† Lawrence Yoon Suk Lee and R. Bruce Lennox*    2006 The reductive voltammetric desorption of n-alkylthiol self-assembled monolayers (SAMs) was studied using ferrocenyldodecanethiol (FcC12SH) as a probe. A short (10 s) incubation in a 2 mM FcC12SH solution labels the pre-existing defect sites present in a tetradecanethiol (C14S?Au) SAM. Additional defects in a C14S?Au SAM are then created by voltammetric cycling to reductive potentials. The effects of changing the desorption potential and the hold time at the desorption potential were investigated 查看全文

343   Prediction of tensile yield strength of rigid inorganic particulate filled thermoplastic composites Prediction of tensile yield strength of rigid inorganic particulate filled thermoplastic composites    1998 Advances in the study of the tensile yield strength of rigid inorganic particulate filled thermoplastic composites have been reviewed and brief comments on the existing expressions for predicting it have been made in the present paper. The main factors affecting the yield strength of such composites are: (i) the interfacial adhesion between the fillers and the matrix; (ii) the shape, size and its distribution of the fillers; (iii) the dispersion of the particles in the matrix. For factor (i), th... 查看全文

344   Structural strength prediction for porous titanium based on micro-stress concentration by micro-CT image-based multiscale simulation Structural strength prediction for porous titanium based on micro-stress concentration by micro-CT image-based multiscale simulation    2010 For the design of porous titanium component, differently from its use as functional materials, structural strength prediction algorithm is proposed based on the micro-stress concentration analyzed by the multiscale simulation. The modeling of real microstructure is carried out by the image-based technique with X-ray micro-CT. The multiscale computational method consists of asymptotic homogenization and finite element mesh superposition (FEMS) techniques. A criterion is proposed to predict the no... 查看全文

345   A Fast Iterative Synthetic Method for Discrete Velocity Calculations A Fast Iterative Synthetic Method for Discrete Velocity Calculations D. Valougeorgis;S. Naris    0 A synthetic acceleration methodology is developed to accelerate the slow convergence rate of the iterative solution of linearized kinetic model equations. The present approach may be considered as a generalization of a recently introduced synthetic discrete velocity method. In the present work the collision term includes perturbations in density, and velocity. The proposed algorithm is based on the formulation of moment equations, the so‐called “synthetic equations”, which are solved coupled wit 查看全文

346   Residual strength prediction of integral structures using numerical crack extension analyses Residual strength prediction of integral structures using numerical crack extension analyses    2008 The residual strength of an Aluminium panel with five stringers, which contained a crack that divided the central stringer, was to be predicted during a Round Robin organised by ASTM. The initial crack tips were right ahead of the stringers #2 and #4, respectively, so that crack branching along the skin and into the stringers occurred after initiation. The prediction has been achieved using finite element simulations including crack extension, for which a cohesive model was utilised. Conventiona... 查看全文

347   Bioassay for enhanced biodegradation of nematicides in soil Bioassay for enhanced biodegradation of nematicides in soil A. B. Pattison, J. M. Stanton;J. A. Cobon    2000 In the Australian banana industry, burrowing nematode (Radopholus similis) is controlled by routine use of chemical nematicides, particularly fenarniphos. A loss in efficacy with prolonged use of fenamiphos may be due to enhanced biodegradation by soil microbes. A simple and inexpensive method was developed to test soil for enhanced biodegradation by comparing nematode recovery from unsterile or sterile soil which had been treated with fenamiphos at 10 μ/g s... 查看全文

348   Bioactivity of flavonoid compounds from Poncirus trifoliata L. (Family: Rutaceae) against the dengue vector, Aedes aegypti L. (Diptera: Culicidae) Bioactivity of flavonoid compounds from Poncirus trifoliata L. (Family: Rutaceae) against the dengue vector, Aedes aegypti L. (Diptera: Culicidae) S. Rajkumar;A. Jebanesan    2008 The bioactivity of four flavonoid compounds, namely poncirin, rhoifolin, naringin and marmesin, from Poncirus trifoliata was studied against the Aedes aegypti. Larvicidal assays were conducted to evaluate the 24 h LC50 and LC90 values of the flavonoid compounds. The lethal concentration (LC50 and LC90) values ranged from 0.082 to 0.122 mg/l and 0.152 to 0.223 mg/l, respectively. The result of ovicidal test suggests that the ovicidal activity of the flavonoid compounds was ... 查看全文

349   Ultimate flexural strength of hybrid composite girders using high-performance steel of HSB600 at sagging bending Ultimate flexural strength of hybrid composite girders using high-performance steel of HSB600 at sagging bending    2011 HSB600 is a high performance steel which is currently developed by a Korean steel company. HSB600 does not have an obvious yield point and yet undergoes large strains after proportional limit. Its 0.2% offset yield strength and tensile strength are over 450 MPa and 600 MPa respectively. Modern standards such as AASHTO LRFD and Eurocode 4 provide rules for determining the flexural strength of composite girders. These rules are based on the presence of a yield point in the stress-strain diagrams o... 查看全文

350   An approach for prediction of strength and post yield behaviour for rock masses of low intact strength An approach for prediction of strength and post yield behaviour for rock masses of low intact strength    2007 In the design of open pits and shallow foundations engineers are often faced with materials that can be classified as rock but do not fit the current set of criteria used to assess their field strength (saprolites, regoliths, duricrusts (ironstones and carbonate caps), coralline limestones, etc.). These materials can be thought of as transition materials between rock and soil and typically exhibit low "intact" strength, which overshadows the presence of any macro features (such as relic structur... 查看全文

351   Effect of concrete strength and stiffness characterization on predictions of mechanistic-empirical performance for rigid pavements Effect of concrete strength and stiffness characterization on predictions of mechanistic-empirical performance for rigid pavements    2011 The hierarchical approach for specifying design inputs is a key feature of the new Mechanistic-Empirical Pavement Design Guide (MEPDG). The three levels of design input for the strength and stiffness characterization of portland cement concrete (PCC) range from a Level 1 laboratory measurement of modulus of elasticity and modulus of rupture at 7, 14, 28, and 90 days to a Level 3 estimation of the 28-day unconfined compressive strength. This paper evaluates the effect of design input level for PC... 查看全文

352   ADVANCES IN STRENGTH PREDICTION FOR SHORT-FIBER REINFORCED PLASTICS. ADVANCES IN STRENGTH PREDICTION FOR SHORT-FIBER REINFORCED PLASTICS.    1981 This paper is concerned with the prediction of strength for short fiber reinforced plastic systems which is a complex but industrially crucial problem. A brief review of various methods developed for calculating the strength of GFRP is followed by a description of a new approach which accounts for the large stress concentration penalties in a perfectly aligned short fiber composite. Although empirical, the method permits calculation of a strength reduction factor which can then be utilized with ... 查看全文

353   Highly Enantioselective Rhodium-Catalyzed Asymmetric 1,4-Addition Reactions of Arylboronic Acids to Acyclic ,β-Unsaturated Compounds: The Formal Synthesis of (−)-Indatraline Highly Enantioselective Rhodium-Catalyzed Asymmetric 1,4-Addition Reactions of Arylboronic Acids to Acyclic ,β-Unsaturated Compounds: The Formal Synthesis of (−)-Indatraline Veacute;ronique Michelet, Patrick;Y. Toullec and Jean-Pierre Genecirc;t    2011 查看全文

354   Intelligent prediction of E4303 electrode mechanical properties based on fuzzy neural network Intelligent prediction of E4303 electrode mechanical properties based on fuzzy neural network    2011 To acquire a prediction model reflecting the relationship between primary materials formula and the deposited metal mechanical properties of electrodes, formula design and resurfacing welding experiments are made on E4303 carbon steel electrode. Mechanical properties indexes of deposited metal including tensile strength, yield strength, elongation percentage, impacting works are also measured. Using the method of adaptive fuzzy neural network, a model for predicting electrode mechanical properti... 查看全文

355   Prediction of the yield strength of polymer blends Prediction of the yield strength of polymer blends    1995 The scheme proposed for predicting the yield strength of binary blends employs a 2-parameter equivalent mechanical model and the data on the continuity of phases calculated from a general formula for modulus proposed by the percolation theory. The phase continuity degree used in the models is controlled by the critical volume fraction and universal exponent. The upper and lower bounds of yield strength are related to 'perfect' and 'zero' interfacial adhesion, respectively. The upper bound may ap... 查看全文

356   Chiral Primary Amine Catalyzed Enantioselective Protonation via an Enamine Intermediate† Chiral Primary Amine Catalyzed Enantioselective Protonation via an Enamine Intermediate† Niankai Fu, Long Zhang, Jiuyuan Li, Prof. Sanzhong Luo and Prof. Jin-Pei Cheng    2011 查看全文

357   Prediction of effective yield strength domain for random heterogeneous materials Prediction of effective yield strength domain for random heterogeneous materials    2009 A random heterogeneous material is represented by a family of microstructures. It is assumed that the random distribution of these microstructures in a representative volume satisfies a condition of perfect mix. The determination of microstructure stress fields then leads to a prediction of the effective yield strength domain. This homogenization method is validated by comparing the provided tensile strength of a biphasic material to that obtained directly by a structure calculus. © 2009 El... 查看全文

358   A Muon Storage Ring for Neutrino Oscillation Experiments A Muon Storage Ring for Neutrino Oscillation Experiments David Cline, David Neuffer    1996 ~- decay in a ~ ? Storage Ring can provide ~e ' ~ beams uniquely suitable for the study of ~ oscillations. The Fer~lab p precooler is studied as a possible first ~ storage ring. 查看全文

359   CHOICE OF SUITABLE METHOD FOR THE PREDICTION OF THE FIELD STRENGTH IN PLANNING LAND MOBILE RADIO SYSTEMS. CHOICE OF SUITABLE METHOD FOR THE PREDICTION OF THE FIELD STRENGTH IN PLANNING LAND MOBILE RADIO SYSTEMS.    1984 Aiming at the choice of a method for the field strength prediction over irregular terrain in land mobile radio service which could be adopted as the most suitable for engineering purposes, six out of the known methods have been analyzed. To verify their prediction accuracy, complex field tests have been carried out. With the moving vehicle, the field strength has been measured along well defined path profiles. Statistical processing of the recorded data has yielded the median field strength leve... 查看全文

360   Chiral Zinc-Catalyzed Asymmetric -Alkylallylation and -Chloroallylation of Aldehydes† Chiral Zinc-Catalyzed Asymmetric -Alkylallylation and -Chloroallylation of Aldehydes† Prof.;Dr. Sh#x16b; Kobayashi, Toshimitsu Endo and Dr. Masaharu Ueno    2011 查看全文

361   Influencing factors for improving accuracy in prediction of stress corrosion crack growth rate in boiling water reactor operational condition -1 prediction of SCC growth rate in terms of Vickers hardn Influencing factors for improving accuracy in prediction of stress corrosion crack growth rate in boiling water reactor operational condition -1 prediction of SCC growth rate in terms of Vickers hardn    2010 It is known that stress corrosion cracking (SCC) found in the operational power plants show complex cracking behaviors and it's resulted in complex crack shape e.g. crack branching and its uneven crack front. For the cracking near the weldment, this is due to crack penetrated along the complex distribution of residual stress and strain hardened area. In this investigation, in order to advance the accuracy for crack growth prediction with considering such complex fields, theoretical formulation f... 查看全文

362   Inexact Inverse Subspace Iteration with Preconditioning Applied to Non-Hermitian Eigenvalue Problems Inexact Inverse Subspace Iteration with Preconditioning Applied to Non-Hermitian Eigenvalue Problems Mickaël Robbé;Miloud Sadkane;Alastair Spence    0 Convergence results are provided for inexact inverse subspace iteration applied to the problem of finding the invariant subspace associated with a small number of eigenvalues of a large sparse matrix. These results are illustrated by the use of block-GMRES as the iterative solver. The costs of the inexact solves are measured by the number of inner iterations needed by the iterative solver at each outer step of the algorithm. It is shown that for a decreasing tolerance the number of inner iterati... 查看全文

363   Polymorphism of ISSR-PCR markers in Tuvinian population of reindeer Rangifer tarandus L. Polymorphism of ISSR-PCR markers in Tuvinian population of reindeer Rangifer tarandus L. N. V. Kol;O. E. Lazebny    2006 The results of the first analysis of the reindeer population inhabiting the south of Siberia, the Republic of Tyva (Tuva), performed by use of inter-simple sequence repeat (ISSR) technique, are reported. Using ISSR-PCR with two primers, a total of 71 fragments of different size were detected. Furthermore, for the population examined the indices of the mean pairwise similarity and the mean heterozygosity were calculated. The approach used can be recommended as a useful too... 查看全文

364   Creep rupture life prediction of creep resistant steels Creep rupture life prediction of creep resistant steels    2009 Allowable tensile stress at the elevated temperatures used for design of high temperature structural components is determined based on a long-term creep strength, such as 100,000 hours creep rupture strength. Aim of the Creep Data Sheet project conducted in National Research Institute for Metals and National Institute for Materials Science is to obtain long-term creep strength data of engineering creep resistant steels and alloys. A time- temperature parameter method is applied for creep rupture... 查看全文

365   Analysis on deformation behavior. of high strength steel using the finite element method in conjunction with constitutive model considering elongation at yield point Analysis on deformation behavior. of high strength steel using the finite element method in conjunction with constitutive model considering elongation at yield point    2010 Tensile tests are widely used for evaluating mechanical properties of materials including flow curves as well as Young's modulus, yield strength, tensile strength, and yield point elongation. This research aims at analyzing the plastic flow behavior. of high strength steels for automotive bodies using the finite element method in conjunction with the viscoplastic model considering the yield point elongation phenomenon. The plastic flow behavior. of the high strength steel was successfully predic... 查看全文

366   Springback prediction of high-strength sheet metal under air bending forming and tool design based on GA-BPNN Springback prediction of high-strength sheet metal under air bending forming and tool design based on GA-BPNN    2011 Based on orthogonal test for air bending of high-strength steel sheets, 125 values of sheet thickness (t), tool gap (c), punch radius (r), ratio of yield strength to Young's modulus (σ y /E), and punch displacement (e) are used to model the springback for air bending of high-strength sheet metal using the genetic algorithm (GA) and back propagation neural network (BPNN) approach, where the positive model and reverse model of springback prediction are established, respectively, with GA and ... 查看全文

367   A combined neural network and mechanistic approach for the prediction of corrosion rate and yield strength of magnesium-rare earth alloys A combined neural network and mechanistic approach for the prediction of corrosion rate and yield strength of magnesium-rare earth alloys    2011 Additions of Ce, La and Nd to Mg were made in binary, ternary and quaternary combinations up to ∼6. wt.%. This provided a dataset that was used in developing a neural network model for predicting corrosion rate and yield strength. Whilst yield strength increased with RE additions, corrosion rates also systematically increased, however, this depended on the type of RE element added and the combination of elements added (along with differences in intermetallic morphology). This work is permits... 查看全文

368   Intermediate Phases in the System Egg Lecithin/CTAC/Brine. SAXS and NMR Studies Intermediate Phases in the System Egg Lecithin/CTAC/Brine. SAXS and NMR Studies Greger Orädd,*† Jonas Gustafsson,‡§ and Mats Almgren‡    2001 The phase behavior. and phase structures in the pseudo ternary system egg lecithin (EPC)/cetyltrimethylammonium chloride/brine (100 mM NaCl) have been investigated by 2H and 31P NMR spectroscopy and small-angle X-ray diffraction (SAXS). At solvent contents higher than 55 wt %, micellar, hexagonal, and lamellar phases are formed. At lower solvent content, an intermediate phase occurs consisting of rods with noncircular cross-sections forming a centered rectangular phase of space symmetry c2mm. Th... 查看全文

369   Correlation relationship between yield strength and the elastic compliance for the polycrystalline Nickel 201 Correlation relationship between yield strength and the elastic compliance for the polycrystalline Nickel 201    2008 Theoretical relationships for the variance, covariance and the correlation coefficient of yield strength and the elastic compliance are presented. Variance of interest here is due to the 'window size' of a representative statistical element, randomly taken from the material. A Taylor viscoplastic theory was used to predict the yield strength in deviatoric form. To compare the predicted correlation relationships for yield strength and the elastic compliance, a polycrystalline hot-rolled and annea... 查看全文

370   Prediction of effective confinement pressure in high-strength concrete columns Prediction of effective confinement pressure in high-strength concrete columns    2008 High-strength concrete (HSC) columns can achieve a ductile behaviour when sufficiently confined by high-strength lateral steel reinforcement. The full potential of high-strength steel, however, may not be achieved in lightly confined HSC columns, since the stress in the confining steel may not reach the expected yield stress usually assumed in design. Different approaches that determine the actual stress in the confining steel at peak stress of confined concrete for prismatic or cylindrical colu... 查看全文

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