bluuebunny/crossref_metadata_2025_split huggingface dataset:
ℋ∞ Control for Descriptor Systems – a Pencil Based Approach
Authors: Benner Peter , Losse Philip 
Published: March 2010

AbstractThe ℋ∞ control problem is studied for linear constant coefficient descriptor systems. Necessary and sufficient optimality conditions as well as controller formulas are derived in terms of deflating subspaces of even matrix pencils for index one systems as well as for higher index problems. A structure preserving method for computing these subspaces is introduced. In combination these results allow the derivation of a numerical algorithm with advantages over the classsical methods. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Extremal Extensions of the Tensor Product of Nonnegative Operators
Authors: Nafalska Maria Magdalena 
Published: March 2010

AbstractFor densely defined nonnegative operators A and B acting in separable Hilbert spaces we describe the Friedrichs and the Krein‐von Neumann extension of the tensor product $A \hat\otimes B$. Moreover, we discuss the class of extremal extensions of $A \hat\otimes B$. An application is presented as well. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Analytic Operator Functions with Selfadjoint Coefficients
Authors: Förster Karl‐Heinz , Hartanto Niels 
Published: March 2010

AbstractIn this note, results of H. K. Wimmer [2] are extended to functions with values in the space of bounded linear operators $B(\cal{H})$ in the Hilbert space \cal{H}$, which are analytic on an annulus and have selfadjoint coefficients. The eigenvalues on the boundary of the spectrum of the functions considered in this note, corresponding to a fixed eigenvector possess a certain symmetry which is well known from the periphal spectrum of entrywise nonnegative matrices, due to the Perron‐Frobenius theorem. Similar results hold for polynomials of type (1) with entrywise nonnegative matrix coefficients Aj, see [1]. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the nonreal eigenvalues of elliptic differential operators with indefinite weights on Lipschitz domains
Authors: Behrndt Jussi , Sète Olivier 
Published: March 2010

AbstractThe nonreal spectrum of a second order elliptic differential operator with an indefinite weight function on a Lipschitz domain is investigated with the help of Krein space techniques and perturbation methods. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Port‐based approach to distributed transfer function method
Authors: Orlikowski C. , Hein R. , Wittbrodt E. 
Published: March 2010

AbstractIn the paper there is presented an uniform, port‐based approach to modeling of both lumped and distributed parameter systems. Port‐based model of distributed system has been defined by application of distributed transfer function method (DTFM). The approach proposed combines versatility of port – based modeling and accuracy of distributed transfer function method. It enables to formulate appropriate input data for computer analysis by application of DTFM. The concise representation of lumped‐distributed systems is obtained. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Diagnostics‐based Approach to Vibration Surveillance during High Speed Milling of Flexible Details
Authors: Kaliński Krzysztof 
Published: March 2010

AbstractThe paper concerns vibration surveillance during ball end milling of curved flexible details and considering assurance of parameters of a modal subsystem. Here is explained dynamic analysis of non‐stationary vibrating system, from which are separated subsystems: modal, structural and connective. Minimising vibration level by matching the spindle speed to optimal phase shift has been employed. Two alternatives of the approach have been developed. The first one is based on generalised condition of optimum spindle speed and relates to diagnosis of chatter vibration with only one detected frequency. The second approach concerns a few harmonic components having different frequencies. Obtained results of production experiments proved a meaning of the approaches. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Vibro‐acoustic method for estimating a liquid level and viscosity
Authors: Szparaga Lukasz , Tarnowski Wojciech , Plawgo Agnieszka , Bartosik Przemyslaw 
Published: March 2010

AbstractThe goal of this work has been to examine a possibility to measure a liquid level and its viscosity by the vibro‐acoustic methods. Preliminary laboratory investigations were completed on a glass vessel filled with solutions of various viscosity and level, excited by a hammer. A microphone and four accelerometers were used as sensors. Few criteria symptoms were checked. For the level and viscosity estimation there were used the placement and values of the Fourier's spectra maximum of the acoustic signal, and of the vibration signals from sensors. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Economically study regarding modernizing of the final working of the car radiators through implementation of an articulated robot in a flexible manufacturing cell
Authors: Simion Mihaela , Petrişor Silviu Mihai 
Published: March 2010

AbstractIn this paper the authors purpose the conception and modelling of a possible application in a circular flexible manufacturing cell. This flexible cell is composed from five manufacturing points for realizing the final technological itinerary of a type of radiator. This flexible manufacturing cell is served by an industrial articulated robot, which possess in his cinematic chain three degrees of freedom, type RRT. In virtue of real values of the functional parameters which are input data in the analysis of the flexible manufacturing cell, had been dignify the cost of the flexible manufacturing cell, determining the value of the included industrial robot in the system and the value of the entire flexible cell where the robot realize the manipulating process of the radiators. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Material Model for the Lifetime Prediction of Regeneratively Cooled Nozzle Structures
Authors: Tini Vivian , Reese Stefanie 
Published: March 2010

AbstractRegeneratively cooled nozzle structures of a Reusable Launch Vehicle (RLV) belong to the most critical components of a space shuttle main engine. The severe operating conditions have been experimentally observed to cause the so‐called “dog‐house” failure mode. Within the DFG Project to develop new technologies for the future space transportation system, a material model which sufficiently describes this phenomenon is needed. In this project we are using a new continuum mechanical approach motivated by a rheological model. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Response of the mechanical system with the hysteresis in a high frequency limit
Authors: Kasperek Rafał , Litak Grzegorz 
Published: March 2010

AbstractVibrations of a single‐degree‐of‐freedom oscillator with a hysteretic damper subjected to kinematic excitations in a high frequency limit have been explored. By using of two time scales expansion we derived an effective damping coefficient. It has been shown that in the limit of the high excitation frequency the hysteretic loop could be eliminated for the slow time scale dynamics. For simplicity, to examine the effect of hysteresis we used the model of a single hysteron. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Reliability based limit design of steel frames with limited residual strain energy capacity
Authors: Rad Majid Movahedi , Lógó János , Knabel Jaroslaw , Tauzowski Piotr 
Published: March 2010

AbstractThe aim of this paper is to take into consideration the influence of the limited load carrying capacity of the connections on the plastic limit state of elasto‐plastic steel (or composite) framed structures under multi‐parameter stochastic loading and probabilistically given conditions. In addition to the plastic limit design to control the plastic behaviour of the structure, bound on the complementary strain energy of the residual forces is also applied. This bound has significant effect for the load parameter. If the design uncertainties (manufacturing, strength, geometrical) are expressed by the calculation of the complementary strain energy of the residual forces a reliability based extended limit design problem is formed. The formulations of the problems yield to nonlinear mathematical programming which are solved by the use of sequential quadratic algorithm. The bi‐level optimization procedure governed by the reliability index calculation. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Isogeometrical approach for cable type structures allowing large sliding contact
Authors: Konyukhov Alexander , Schweizerhof Karl 
Published: March 2010

AbstractA special combination of two finite elements approaches is considered in order to derive a formulation suitable for cable type structures. First, a finite beam element allowing arbitrarily large rotations together with a high order approximation technique including a C1‐continuous approximation is used to model cable behavior. Afterwards, a covariant approach for a curve‐to‐curve contact is exploited to incorporate contact between a pair of cable elements. This leads to a cable type element with contact. In numerical examples both “soft” and “hard” cables are represented. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On wheel–rail contact problem with material properties varying with depth
Authors: Chudzikiewicz Andrzej , Myśliński Andrzej 
Published: March 2010

AbstractNumerous laboratory experiments indicate that the use of a layer or a coating material attached to the conventional steel body reduce the magnitude of contact stress. Therefore in this paper we solve numerically the wheel–rail contact problem with friction and wear assuming the existence of a small elastic layer on the rail surface. Material properties of this layer are changing with its depth. The friction between the bodies is governed by Coulomb law. In contact zone Archard's law of wear is assumed. We take special features of this rolling contact problem and use so‐called quasistatic approach to solve this contact problem. Finite element method is used as a discretization method. The numerical results including the distribution of normal stress along the contact boundary are provided and discussed. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Comparative analysis of soybean plasma membrane proteins under osmotic stress using gel‐based and LC MS/MS‐based proteomics approaches
Authors: Nouri Mohammad‐Zaman , Komatsu Setsuko 
Published: March 2010

AbstractTo study the soybean plasma membrane proteome under osmotic stress, two methods were used: a gel‐based and a LC MS/MS‐based proteomics method. Two‐day‐old seedlings were subjected to 10% PEG for 2 days. Plasma membranes were purified from seedlings using a two‐phase partitioning method and their purity was verified by measuring ATPase activity. Using the gel‐based proteomics, four and eight protein spots were identified as up‐ and downregulated, respectively, whereas in the nanoLC MS/MS approach, 11 and 75 proteins were identified as up‐ and downregulated, respectively, under PEG treatment. Out of osmotic stress responsive proteins, most of the transporter proteins and all proteins with high number of transmembrane helices as well as low‐abundance proteins could be identified by the LC MS/MS‐based method. Three homologues of plasma membrane H+‐ATPase, which are transporter proteins involved in ion efflux, were upregulated under osmotic stress. Gene expression of this protein was increased after 12 h of stress exposure. Among the identified proteins, seven proteins were mutual in two proteomics techniques, in which calnexin was the highly upregulated protein. Accumulation of calnexin in plasma membrane was confirmed by immunoblot analysis. These results suggest that under hyperosmotic conditions, calnexin accumulates in the plasma membrane and ion efflux accelerates by upregulation of plasma membrane H+‐ATPase protein.
Androgen ablation augments human HLA2.1‐restricted T cell responses to PSA self‐antigen in transgenic mice
Authors: Arredouani Mohamed S. , Tseng‐Rogenski Stephanie S. , Hollenbeck Brent K. , Escara‐Wilke June , Leander Karen R. , Defeo‐Jones Deborah , Hwang Clara , Sanda Martin G. 
Published: March 2010

AbstractBACKGROUNDIn recent years, there has been an increasing interest in targeting human prostate tumor‐associated antigens (TAAs) for prostate cancer immunotherapy as an alternative to other therapeutic modalities. However, immunologic tolerance to TAA poses a significant obstacle to effective, TAA‐targeted immunotherapy. We sought to investigate whether androgen deprivation would result in circumventing immune tolerance to prostate TAA by impacting CD8 cell responses.METHODSTo this end, we generated a transgenic mouse that expresses the human prostate‐specific antigen (PSA) specifically in the prostate, and crossed it to the HLA‐A2.1 transgenic mouse to evaluate how androgen deprivation affects human HLA A2.1‐resticted T cell responses following immunization of PSA‐expressing mice by vaccinia‐PSA (PROSTVAC).RESULTSOur PSA transgenic mouse showed restricted expression of PSA in the prostate and detectable circulating PSA levels. Additionally, PSA expression was androgen‐dependent with reduced PSA expression in the prostate within 1 week of castration, and undetectable PSA by day 42 after castration as evaluated by ELISA. Castration of the PSA/A2.1 hybrid mouse prior to immunization with a PSA‐expressing recombinant vaccinia virus resulted in a significant augmentation of PSA‐specific cytotoxic lymphocytes.CONCLUSIONSThis humanized hybrid mouse model provides a well‐defined system to gain additional insight into the mechanisms of immune tolerance to PSA and to test novel strategies aiming at circumventing immune tolerance to PSA and other TAA for targeted prostate cancer immunotherapy. Prostate © 2010 Wiley‐Liss, Inc.
Physcion, a natural anthraquinone derivative, enhances the gene expression of leaf‐specific thionin of barley against Blumeria graminis
Authors: Ma Xingxia , Yang Xiaojun , Zeng Fansong , Yang Lijun , Yu Dazhao , Ni Hanwen 
Published: March 2010

AbstractBACKGROUND:Physcion is a key active ingredient of the ethanol extract from roots of Chinese rhubarb (Rheum officinale Baill.) that has been commercialised in China for controlling powdery mildews. The biological mechanism of action of physcion against the barley powdery mildew pathogen was studied using bioassay and microarray methods.RESULTS:Bioassay indicated that physcion did not directly affect conidial germination of Blumeria graminis Speer f. sp. hordei Marchal, but significantly inhibited conidial germination in vivo. Challenge inoculation indicated that physcion induced localised resistance rather than systemic resistance against powdery mildew. Gene expression profiling of physcion‐treated barley leaves detected four upregulated and five downregulated genes (ratio ≥ 2.0 and P‐value < 0.05) by using an Affymetrix Barley GeneChip. The five upregulated probe sequences blasted to the same barley leaf‐specific thionin gene, with significant changes varying from 4.26 to 19.91‐fold. All downregulated genes were defence‐related, linked to peroxidase, oxalate oxidase, bsi1 protein and a pathogenesis‐related protein. These changes varied from − 2.34 to − 2.96. Quantitative real‐time PCR data confirmed that physcion enhanced the gene expression of leaf‐specific thionin of barley.CONCLUSION:Results indicated that physcion controls powdery mildew mainly through changing the expression of defence‐related genes, and especially enhancing expression of leaf‐specific thionin in barley leaves. Copyright © 2010 Society of Chemical Industry
Exploring strongly correlated quantum many‐body systems with ultracold atoms in optical lattices
Authors: Bloch Immanuel , Rosch Achim 
Published: March 2010

AbstractUltracold quantum gases in optical lattices can be used as novel model system for the exploration of strongly correlated many‐body phases of bosonic or fermionic particles. Here we report on the realization of metallic, Mott‐insulating and band insulating phases in ultracold spin mixtures of fermionic 40K atoms. The experimental results are compared to ab initio dynamical mean field theory (DMFT) calculations.
The effect of laser crystallization on the carrier transport and electroluminescence from nanocrystalline Si/SiO2 multilayers
Authors: Wang T. , Sun H. C. , Liu Y. , Chen G. R. , Xu J. , Wang D. Q. , Wan N. , Li W. , Huang X. F. , Ma Z. Y. , Xu L. , Chen K. J. 
Published: March 2010

AbstractPeriodic amorphous Si (a‐Si)/SiO2 multilayers, fabricated in a conventional plasma enhanced CVD system by alternatively changing the deposition of ultrathin a‐Si film and in‐situ plasma oxidation process, formed (nc‐Si)/SiO2 multilayers after the subsequent KrF laser‐crystallization. Stable electroluminescence (EL) can be achieved at room temperature from laser crystallized multilayers by evaporating ITO and Al as electrodes. The influence of laser energy density on the cur‐ rent‐voltage characteristics and EL property was investigated. It is found that the EL efficiency of laser crystallized sample is changed with laser energy density, and the EL intensity is comparable with that of furnace annealed sample. Our results indicate that the laser crystallization may be an appropriate approach to obtain light‐emitting nanocrystalline Si for future applications. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A microscopic bonding model for the compositional dependence of the first sharp diffraction peak (FSDP) in GexSe1‐xalloys
Authors: Lucovsky Gerald , Phillips James C. 
Published: March 2010

AbstractThis article analyzes results from two papers that have studied the first sharp diffraction peak, FSDP, in GexSe1‐x alloys as a function of the alloy composition, x. The research reported in one of these papers obtained the FSDP in eighteen closely spaced compositions for x between 0.15 and 0.4, and included the intermediate phase, IP, regime between x = ∼0.2 and ∼0.25. S(Q) structure factor plots from diffraction measurements were characterized empirically in terms with several different fitting functions. These second paper used Monte‐Carlo methods for a smaller set of compositions. In this paper, the positions and widths of the FSDP's peaks as a function of alloy composition are correlated with changes in the atomic bonding from Se‐rich to Ge‐rich regimes. Additionally this paper identifies medium range order, MRO, length scales for chemical bonding self‐organizations within the IP regime that are important for promoting macroscopic strain reduction. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Dimensional constraints and percolation theory: physical mechanisms controlling electronic structure and defects in high‐k transition metal oxide dielectrics
Authors: Lucovsky Gerald 
Published: March 2010

AbstractThis article addresses three different aspects of nano‐scale structure that are important for the implementation of high‐k gate dielectrics, such as HfO2 and Hf Si oxynitride alloys, for advanced gate stack applications ultra large scale integrated (ULSI) circuit and system chips. Two of these deal with nano‐crystalline thin films where it is necessary to make a distinction between the primitive unit cell, and a more extended electronic cell that can support cooperative Jahn‐Teller distortions. The final example relates the bonding coordination of group IVB transition metal (TM) atoms, Ti, Zr and Hf in a ternary composition in which the concentration of four‐fold coordinated TM atoms is above a critical percolation threshold. This is critical for strain relief, thereby promoting low densities of electronically‐active defects. X‐ray absorption spectroscopy studies play a significant role in revealing these important aspects of nano‐structure, and are interpreted with in the frame‐work of many‐electron electronic structure theory. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Analysis of the forgotten parts of the Ge K edge spectra: life before the EXAFS oscillations
Authors: Lucovsky Gerald , Washington Joseph P. , Miotti Leonardo , Paesler Michael 
Published: March 2010

AbstractThe white line and X‐ray absorption near edge spectros‐copy (XANES) spectral regions of the Ge K edge, ∼11100 to 11112 eV, and between 11112 and 11180 eV and beyond, contain electronic structure information that complements near‐neighbor bonding information in the single‐scattering EXAFS regime. The multiple‐scattering XANES features are not generally addressed in EXAFS studies that are targeted to obtain bonding information. There are systematic changes in the X‐ray photon energy of the spectral peak of the white line for Ge‐Sb‐Te (GST) alloys, GeSb and GeTe model compounds, and other Ge alloys that scale directly with average bond ionicity. The spectral widths of these features correspond tp electronic transitions important in optical memory devices. There are other features in the XANES region associated with shake‐off effects for shallow atomic core states that re‐veal bonding information important in analysis of the oscillatory features in the EXAFS regime. These include bonding pairs that are addressed in the fit procedures; e.g., Ge‐Te and Ge‐Sb in GST 225. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Composition and bonding structure of plasma‐assisted ALD Al2O3 films
Authors: Verlaan V. , van den Elzen L. R. J. G. , Dingemans G. , van de Sanden M. C. M. , Kessels W. M. M. 
Published: March 2010

AbstractA systematic study on the composition and bonding structure of plasma‐assisted ALD Al2O3 films deposited at substrate temperatures between 25 and 400 °C is presented. The composition of the films is determined with Rutherford back scattering (RBS) and elastic recoil detection (ERD). The O/Al atom ratio in the films changes from 2.0 to 1.5 and the mass density increases from 2.6 to 3.1 g/cm3 when increasing the substrate temperature. The hydrogen content decreases with substrate temperature from 13 at.% at 50 °C to less than 1 at.% at 400 °C. Fourier transform infrared spectroscopy shows that the H atoms are predominantly bonded to O atoms, and that the H atoms are effectively removed after annealing at 400 °C. Depth resolved XPS measurements reveal that the atomic concentrations remains constant after annealing. The O1s and Al2p XPS peak positions show that film has different bonding structure at the interface. compared to the bulk. After annealing the bulk of the film shows indications of relaxation whereas the interface is unchanged. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the conditional logistic estimator in two‐arm experimental studies with non‐compliance and before–after binary outcomes
Authors: Bartolucci Francesco 
Published: March 2010

AbstractThe behavior of the conditional logistic estimator is analyzed under a causal model for two‐arm experimental studies with possible non‐compliance in which the effect of the treatment is measured by a binary response variable. We show that, when non‐compliance may only be observed in the treatment arm, the effect (measured on the logit scale) of the treatment on compliers and that of the control on non‐compliers can be identified and consistently estimated under mild conditions. The same does not happen for the effect of the control on compliers. A simple correction of the conditional logistic estimator is then proposed, which allows us to considerably reduce the bias in estimating this quantity and the causal effect of the treatment over control on compliers. A two‐step estimator results on the basis of which we can also set up a Wald test for the hypothesis of absence of a causal effect of the treatment. The asymptotic properties of the estimator are studied by exploiting the general theory on maximum likelihood estimation of misspecified models. Finite‐sample properties of the estimator and of the related Wald test are studied by simulation. The extension of the approach to the case of missing responses is also outlined. The approach is illustrated by an application to a dataset deriving from a study on the efficacy of a training course on the breast self examination practice. Copyright © 2010 John Wiley & Sons, Ltd.