bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multi‐Agent Motion Control of Autonomous Vehicles in 3D Flow Fields
Authors: Hackbarth Axel , Kreuzer Edwin , Gray Andrew 
Published: December 2012

AbstractMotion control of multiple autonomous vehicles is necessary to assure safe interaction of agents operating in the same environment. Under the influence of fluid flow the control strategy for the agents has to adapt to the forces acting upon the vehicles. A potential‐field based algorithm for multi‐agent control has been extended to account for correct guidance under the influence of flow. Path following and collision avoidance are the main objectives for the control algorithm which is developed for an underwater sensor network. An approximation of the flow is used for the path planning with model predictive control, whereas path following is assured through sliding mode control. The controller has yet been tested in simulations only, but experiments are planned with a swarm of five to ten micro submarines in a water tank with natural and forced convection. The fluid field in the simulation originates from a CFD analysis of the water tank under steady flow conditions where the impact of the vehicles has been neglected. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Three‐Dimensional Panel Method for the Simulation of Sheet Cavitation in Marine Propeller Flows
Authors: Bauer Maria , Abdel‐Maksoud Moustafa 
Published: December 2012

AbstractThis paper presents a three‐dimensional panel method based on potential flow theory for the modelling and simulation of sheet cavitation in marine propeller flows. Sheet cavitation is a physical effect where the pressure in the flow falls below the vapour pressure such that a vapour sheet occurs on propeller blades. Sheet cavitation can influence the flow characteristics on propeller blades significantly and can lead to a decrease of propeller thrust as well as noise and vibrations on the ship hull. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Asymptotic Cosserat models for viscous jets in rotational spinning
Authors: Arne Walter , Marheineke Nicole , Wegener Raimund 
Published: December 2012

AbstractWe present asymptotic Cosserat rod and string models for the simulation of slender viscous jets. In the set‐up of rotational stationary spinning we examine the models with respect to their applicability/validity and efficiency. The string models are asymptotic limits of the rod in terms of a vanishing slenderness parameter. They consist of smaller systems of equations, but as a result of a singular asymptotic perturbation their applicability is restricted to certain parameter regimes – in contrast to the more complex and hence superior Cosserat rod. We investigate the existence regimes of two string models that differ in the closure conditions and determine their transition hyperplane numerically. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A note on the W1,p‐stability of piecewise linear interpolation
Authors: Dickopf Thomas 
Published: December 2012

AbstractIt is known that piecewise linear interpolation of functions of one variable is uniformly bounded with an H1‐stability constant of one. In [1], we considered the nodal interpolation operator acting between spaces of piecewise linear functions and presented an elementary proof by minimizing a functional representing the H1‐semi‐norm. In this note, a standard approximation argument is applied generalizing the result to piecewise linear interpolation of all functions in W1,p on a real interval, 1 ≤ p ≤ ∞. We also comment on alternative proofs and finally give a counterexample for piecewise linear interpolation in 2D. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Counting Droplets: A solver for the droplet population balance equation
Authors: Wächtler Timo , Kuhnert Jörg , Attarakih Menwer , Klar Axel 
Published: December 2012

AbstractLiquid‐Liquid‐Extractions is one of the fundamental operations in chemical engineering. At this, one or more components are being separated from a liquid mixture. However, this work restricts to a two component mixture. The most common used extractors in this field are liquid‐liquid‐extraction columns. For such extraction columns there exist many executions, however they share their functional principle. A vertically aligned column is being fed at the top by the mixture of components to be separated. On the contrary, the column is getting filled by a specifically lighter solvent at the bottom. With the help of appropriate installations (stirrer, sieve) an intensive mixing of these two phases is achieved. This process makes the solvent form many tiny droplets, which are going to rise along the extraction column due to the difference in the densities of the two phases. While the droplets are rising an exchange of material happens (mass transfer) whereby components of the mixture are getting separated. This work presents a numerical method to resolve the hydrodynamic model of the droplets. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Stability analysis of solid‐state lasers regarding thermal lensing effect
Authors: Graupeter Thomas , Pflaum Christoph 
Published: December 2012

AbstractThe thermal lensing effect in the crystal influences the stability of solid‐state lasers. The deformation of the end faces of the crystal and the temperature dependence of the refraction index causes this effect. The photoelastic effect produced by thermal induced stress in the crystal has also an influence. For high power lasers and for lasers with a radially polarized laser beam the analysis of the photoelastic effect is important. We use FE model to calculate the deformation, heat and stress distribution in the laser crystal with high accuracy in this work. Using the calculated stress distribution we also simulated the refraction index anisotropy with respect to the crystal orientation. We can study stability of laser resonators for both radially and azimuthally polarized laser beam, as a result of our simulation. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Semi‐Lagrangian discretization of the upper‐convective derivative in Non‐Newtonian fluid flow
Authors: Wensch Jörg , Naumann Andreas 
Published: December 2012

AbstractNon‐Newtonian fluid flow is governed by the Navier‐Stokes equations with an additional source term resulting from Non‐Newtonian stresses. The Non‐Newtonian stresses evolve along particle paths according to an evolution equation. The temporal derivative in this case is the upper convected derivative. We describe a semi‐Lagrangian discretization of the upper convected derivative. Numerical results for the flow over a contraction are given. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Definitizable products of selfadjoint operators
Authors: Azizov Tomas Ya. , Denisov Mikhail , Philipp Friedrich 
Published: December 2012

AbstractWe extend the notion of definitizability from selfadjoint operators in Krein spaces to products of selfadjoint operators in Hilbert spaces and show that the spectral properties essentially remain the same. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On perturbations in the leading coefficient matrix of time‐varying index‐1 DAEs
Authors: Berger Thomas 
Published: December 2012

AbstractTime‐varying index‐1 DAEs and the effect of perturbations in the leading coefficient matrix is investigated. An appropriate class of allowable perturbations is introduced. Robustness of exponential stability with respect to a certain class of perturbations is shown in terms of the Bohl exponent and perturbation operator. Finally, a stability radius involving these perturbations is introduced and investigated. In particular, a lower bound for the stability radius is derived. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ℋ∞‐Norm Computation for Large and Sparse Descriptor Systems
Authors: Benner Peter , Voigt Matthias 
Published: December 2012

AbstractIn this paper we discuss the problem of computing the ℋ∞‐norms of transfer functions associated to large‐scale descriptor systems. We exploit the relationship between the ℋ∞‐norm and the structured complex stability radius of the corresponding system pencil. To compute the structured stability radius we consider so‐called structured pseudospectra. Namely, we have to find the pseudospectrum that touches the imaginary axis. Therefore, we set up an iteration over the real part of the rightmost pseudoeigenvalue. For that we use a new fast iterative scheme which is based on certain rank‐1 perturbations of the system pencil. Finally, we illustrate the performance of our algorithm by using a real‐world example. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A combined approach of considering uncertainty in optimization tasks to efficiently identify robust designs
Authors: Götz Marco , Pannier Stephan , Graf Wolfgang , Kaliske Michael 
Published: December 2012

AbstractThe aim of almost all design tasks in engineering is to determine a robust design. In order to assess the robustness, the uncertainty of input parameters has to be taken into account. The incorporation of uncertain parameters in an optimization task may succeed in an active or passive manner. In this contribution, the theoretical bases of active and of passive optimization strategies are introduced. In an active approach, also denoted as here‐and‐now strategy, the uncertainty for a respective design is known and the robustness can be assessed directly. Thereby, the numerical effort to determine a robust optimum can be tremendous. In a passive approach, also denoted as wait‐and‐see strategy, the optimal design is determined without a distinct knowledge about the uncertainty of this design. A first good shot about an optimal robust design can be determined efficiently, but a quantification of robustness is hindered. Both approaches are evaluated in detail and on the basis of the obtained results, a combined approach is elaborated. In a combined approach, the advantages should be intensified while the disadvantages should be reduced. Hence, a robust design can be identified in a numerically efficient way. The applicability of the presented approach is demonstrated by means of an example. (© 2012 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multiple primary cancer survivors have poorer health status and well‐being than single primary cancer survivors: a study from the population‐based PROFILES registry
Authors: Thong Melissa S. Y. , Mols Floortje , Verhoeven Rob H. A. , Liu Lifang , Andrykowski Michael A. , Roukema Jan A. , van de Poll‐Franse Lonneke V. 
Published: December 2012

AbstractObjectiveThe health status and psychosocial well‐being of multiple primary cancer (MPC) survivors are under‐researched.MethodsIn total, 3615 survivors identified from the Eindhoven Cancer Registry between 2008 and 2009 were assessed. About one in six survivors had survived MPC (n = 556). All survivors completed questionnaires on health status (SF‐36/European Organization of Research and Treatment of Cancer quality of life module), mental health (Hospital Anxiety and Depression Scale) and impact of cancer (Impact of Cancer).ResultsCompared with single primary cancer survivors, MPC survivors reported significantly poorer scores on general health and higher symptom scores on diarrhoea and fatigue. Significantly more MPC survivors met the subclinical cut‐off score of ≥8 points on the Hospital Anxiety and Depression Scale depression subscale (27% vs. 19%, p = 0.0001). MPC survivors also reported significantly greater negative impact of cancer (namely body changes and life interferences) and positive impact of health awareness on their lives. All results were adjusted for age at survey, time since last diagnosis, sex, comorbidity, body mass index and marital status.In secondary analyses, MPC survivors with different primary cancer combinations or time interval between primary cancer diagnoses had comparable health status and psychosocial well‐being.ConclusionMultiple primary cancer survivors reported a poorer health status and, in general, experienced a greater negative impact of cancer on their psychosocial well‐being than single primary cancer survivors. Copyright © 2012 John Wiley & Sons, Ltd.
Non‐inferiority and superiority tests for partially matched data when a constraint is placed on the number of new tests
Authors: van de Ven Peter M. , Berkhof Johannes 
Published: December 2012

AbstractStudies for assessing non‐inferiority or superiority of a new diagnostic or screening test relative to a standard test use a complete matched‐pairs design in which results for both tests are obtained for all subjects. We present alternative tests for the situation where results on the standard test are obtained for all subjects but results on the new test are obtained for a subset of those subjects only. This situation is common when results for the standard test are available from a large biobank. We present a stratified random sampling procedure for drawing the subsample of subjects that receive the new diagnostic test with strata defined by the two outcome categories of the standard test. We derive appropriate statistical tests for non‐inferiority and superiority of the new diagnostic test. We will show how the number of subjects that receive the new test can be minimized by non‐proportional stratified random sampling. Copyright © 2012 John Wiley & Sons, Ltd.
Microstructured, Functional PVA Hydrogels through Bioconjugation with Oligopeptides under Physiological Conditions
Authors: Chong Siow‐Feng , Smith Anton A. A. , Zelikin Alexander N. 
Published: December 2012

AbstractIn this work, bioconjugation techniques are developed to achieve peptide functionalization of poly(vinyl alcohol), PVA, as both a polymer in solution and within microstructured physical hydrogels, in both cases under physiological conditions. PVA is unique in that it is one of very few polymers with excellent biocompatibility and safety and has FDA approval for clinical uses in humans. However, decades of development have documented only scant opportunities in bioconjugation with PVA. As such, materials derived thereof fail to answer the call for functional biomaterials for advanced cell culture and tissue engineering applications. To address these limitations, PVA is synthesized with terminal thiol groups and conjugated with thiolated peptides using PVA in solution. Further, microstructured, surface‐adhered PVA physical hydrogels are assembled, the available conjugation sites within the hydrogels are quantified, and quantitative kinetic data are collected on peptide conjugation to the hydrogels. The success of bioconjugation in the gel phase is quantified through the use of a cell‐adhesive peptide and visualization of cell adhesion on PVA hydrogels as cell culture substrates. Taken together, the presented data establish a novel paradigm in bioconjugation and functionalization of PVA physical hydrogels. Coupled with an excellent safety profile of PVA, these results deliver a superior biomaterial for diverse biomedical applications.
Stackable ROADM with optical amplifier for use in IP‐Over‐CWDM ring networks
Authors: Koyama Osanori , Nooruzzaman Md. , Thi Thanh Thuy Nguyen , Zahilah Raja , Uesugi Tatsuya , Katsuyama Yutaka 
Published: December 2012

AbstractA stackable module with a bidirectional coarse wavelength division multiplexing (CWDM) amplifier is proposed to introduce the optical amplifier into an stackable‐reconfigurable optical add/drop multiplexers (S‐ROADM) for use in an IP‐over‐CWDM ring network, and the performance is evaluated experimentally. Packet transfer changes are monitored during the lightpath reconfiguration, which needs optical amplification. The result clarify that the lightpaths are reconfigured successfully, including the remote activation of the amplifiers. As a result, the stackable feature of the amplifier module enables us to provide a cost‐effective introduction into the network on an implement‐it‐when‐necessary base in a fully compatible way with the existing S‐ROADM modules when constructing the S‐ROADM with an amplifier. Therefore, the amplifier module can be used in the same way as the ROADM modules to construct the S‐ROADM, providing manually adding capability of the amplifier to in‐service networks. Thus, the amplifier module has a big advantage to use it flexibly and economically in the IP‐over‐CWDM ring networks. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Fast approximation of Parzen density estimation for fingerprint alignment
Authors: Park Heemin 
Published: December 2012

AbstractPrevious fingerprint alignment approaches may produce biased results because of outliers caused by fingerprint noise. To account for noise, major trends from transformations can be extracted using Parzen density estimation. However, this extraction is computationally intense. Here, we propose a fast approximation algorithm of the Parzen density estimation for global fingerprint alignment. Experimental results show that the proposed algorithm's performance is as good as that of Parzen density estimation and it has a much shorter execution time. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Contemplation on Detonation Pressures of Nitramines and ­Nitro Aromatics
Authors: Türker Lemi 
Published: December 2012

AbstractA physical model and a mathematical theory for the detonation pressures of explosives materials were developed. The pressure values are expressed as function of the detonation velocity (D) and the average mass (m) of the gaseous products, and are applied for various nitramines and aromatic nitro compounds including nitro pyrimidines and nitro triazines. Some regression equations were obtained and discussed. The pressure values show poor linear dependence on the average mass of the products but good dependence on the detonation velocities alone or Dm. Moreover, for the same Dm value nitramines should produce more pressure than aromatic nitro compounds. This work deals with pressure developed by explosion products and interrelates it with detonation pressure within the constraints of certain assumptions and pays attention to so far unnoticed relationships at least under certain circumstances.
Tschermaks Clinopyroxene-bearing Calc-silicate Skarn Rock at Nirwand, Patcham Island, Kutchh, Gujarat
Authors: Maitra Monoj , Korakoppa M. M. 
Published: December 2012

Abstract
The alkaline plug of Nirwandh in Patchaam Island, Kutchh district, Gujarat is emplaced within the unmetamorphosed Jurassic limestone of Patcham Formation. A thin band of Tschermaks clinopyroxene (fassaite)-grandite-bearing calc-silicate occurs as skarn rock at the contact of the alkaline plug and limestone sediments. The mineralogical and textural evidences indicate that the rock is evolved by contact metamorphism due to fluid infiltration at shallower depth during very high temperature regime.
MnNCKFMASH Phase Relations in Cordierite–Orthopyroxene Migmatitic Gneisses, Southern India: Implications for Low-pressure Crustal Melting under Granulite-facies
Authors: Sreejith C. , Kumar G. R. Ravindra 
Published: December 2012

Abstract
Cordierite-orthopyroxene migmatitic gneisses exposed in Achankovil unit of the Kerala Khondalite Belt, southern India show evidences of melting, melt extraction and in-situ crystallization of melt under granulite-facies conditions. The sequential mineral assemblages garnet + biotite + orthopyroxene + plagioclase + quartz (± melt) in the mesosomes and garnet + biotite + orthopyroxene + cordierite + plagioclase + K-feldspar + quartz + melt in the melanosomes makes the Achankovil cordierite-orthopyroxene migmatitic gneisses a good example of anatectic rocks, where substantial melt fractions remained in-situ during decompression and cooling. Therefore, the rocks provide an opportunity to investigate deep crustal processes and record of rheological (thermal and mechanical) reequilibration prevailed during the final stages of orogeny.
The significance of cordierite formation and its possible relationship with melt formation are investigated applying theoretical calculations in the MnO–Na2O–CaO–K2O–FeO–MgO–Al2O3–SiO2–H2O (MnNCKFMASH) system. Results of numerical modelling of the mineral assemblages in pressure–temperature–composition (P–T–X) pseudosections using Perple_X infer that the sequence of reactions involving formation of cordierite-orthopyroxene-melt assemblage is consistent with an isothermal decompression (with a pressure drop of &gt;1.5 kbars) at high temperatures (&gt;800 °C), forming leucosomes. Biotite dehydration melting reactions, occurring above 4.5 kbars constrain prograde arm of the P–T trajectory and is interpreted as a product of crustal thickening, which was followed by rapid decompression. The final stage of exhumation is characterized by rehydration of cordierites in the melanosome by melt-solid interactions at exceptionally low-pressure (~3.2 kbars) conditions. The high-temperature isothermal decompression inferred from the mineral reactions and P–T–X pseudosections constitute a clockwise P–T path for the exhumation of the lower crust. This clockwise P–T path is consistent with the common tectonic model accepted for the genesis of granulite-facies migmatites during crustal thickening and later unroofing, accompanied with arc-continent collision. Our conclusions indicate low–P metamorphism and anatexis can be traced to convergent setting, where melt buoyancy considerably decreases density of the lithosphere and modifies rheology leading to rapid exhumation of the lower crust. Therefore, the crustal evolution in the Kerala Khondalite Belt is correlated with two stage processes: (i) thickening of the crust in relation to a continental-arc setting, followed by (ii) exhumation along a high-temperature stable geotherm with sufficient pressure release associated with syn- to post-convergence transpression and transtension.
Geochemical Exploration for Hydrocarbons in the Soils of Southeast of Krishna-Godavari Basin, Andhra Pradesh
Authors: Lakshmi M. , Rasheed M. A. , Madhavi T. , Reddy B. Rajeswara , Kalpana M. S. , Patil D. J. , Dayal A. M. 
Published: December 2012

Abstract
Surface adsorbed gas surveys and geo-microbiological surveys are known techniques of petroleum exploration and aim towards risk reduction in exploration by way of identifying the areas warm with hydrocarbons and to establish intense exploration priorities amongst the identified warm areas. The present investigation aims to explore correlation between the adsorbed gas distribution pattern with the distribution of the counts of methane, ethane, propane and butane microbial oxidizers in the sub soil samples to establish the role of the latter in identifying the upward migration of hydrocarbons especially in the known petroliferous Krishna-Godavari Basin, India. A total of 135 soil samples were collected near oil and gas fields of Tatipaka, Pasarlapudi areas of Krishna Godavari Basin, Andhra Pradesh. The soil samples were collected from a depth of 2 - 2.5 m. The samples collected, were analyzed for indicator hydrocarbon oxidizing bacteria, adsorbed light gaseous hydrocarbons and carbon isotopes (δ13Cmethane). The microbial prospecting studies showed the presence of high bacterial population for methane (3.94 x 105 cfu/gm), ethane (3.85 x 105 cfu/gm), propane (4.85 x 105 cfu/gm) and butane oxidizing bacteria (3.63 x 105 cfu/gm) in soil samples indicating microseepage of hydrocarbons. The light gaseous hydrocarbon analysis showed 83 ppb, 92 ppb, 134 ppb, 187 ppb and 316 ppb of C1, C2, C3, nC4 and nC5, respectively, and the carbon isotopic composition of δ13C1of the samples ranged between – 36.6 ‰ to -22.7‰ (Pee Dee Belemnite) values, which presents convincing evidence that the adsorbed soil gases collected from these sediments are of thermogenic origin. Geo-microbial prospecting method and adsorbed soil gas and carbon isotope studies have shown good correlation with existing oil/gas fields of K.G basin. Microbial surveys indicating microseepage of hydrocarbons can, therefore, independently precede other geochemical and geophysical surveys to delineate areas warm with hydrocarbons and mapped microbiological anomalies may provide focus for locales of hydrocarbon accumulation in the K.G basin.