bluuebunny/crossref_metadata_2025_split huggingface dataset:
Controlling chaotic discrete dynamical systems through fixed point iterative methods
Authors: Berinde Vasile , Pačurar Mădălina 
Published: February 2009

AbstractA simple and natural technique for controlling chaos in discrete dynamical systems, originating in iterative approximation of fixed points, is developed. We show by numerical simulations that our technique of stabilizing unstable periodic points of chaotic discrete systems is effective and, moreover, compared to other stabilizing methods, has a extremely high speed. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical Approximation of Uncertain Nonlinear Systems
Authors: Gaull Andreas , Kreuzer Edwin 
Published: February 2009

AbstractWe address qualitative characteristics of dynamical systems and their approximation using set–valued numerical methods, where we aim at robust results. In this spirit, model uncertainties are incorporated into the problem formulation as outcomes of an external stochastic process. The systems under consideration are described in terms of finite state Markov chains. An example serves to illustrate the procedure. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The application of robust control for vibration damping of working machines seat suspensions
Authors: Maciejewski Igor 
Published: February 2009

AbstractThe object of simulation is the seat with a visco–elastic active suspension, with improved vibro–isolation properties using the robust control. Based on the verified passive seat suspension model, the robust control possibilities in order to help the working machines operators against vibration is considered. As the viobro–isolation criteria, the seat effective amplitude transmissibility factor (SEAT) and maximum relative displacement between the working machine's cabin floor and the seat is chosen and evaluated. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Adaptive disturbance transmission decoupling in active vehicle suspensions
Authors: Readman Mark , Corless Martin , Villegas Carlos , Shorten Robert 
Published: February 2009

AbstractWith active vehicle suspension, one can tailor a vehicles response to load and inertial without affecting the vehicle response to road disturbances. This decoupling is achieved in [1] and [2] using a filtered combination of measured signals. These filters require exact knowledge of certain vehicle parameters including vehicle mass to achieve the desired decoupling. Here we propose a parameter adaptive version of these filters which does not require knowledge of vehicle parameters. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Prooving Identities with Computer‐Algebra ‐‐ Example: Algebraic Time‐Derivative Estimation
Authors: Reger Johann , Jouffroy Jérôme 
Published: February 2009

AbstractFor the case of continuous–time systems, this note contributes a detailed proof relating the so–called algebraic approach to time–derivative estimation, as proposed by Fliess and co–workers, to classical results from linear estimation theory. The proof is based on a modern computer–algebra proof technique that, in the main, resorts to the celebrated algorithm by Wilf and Zeilberger in the multisum case. As a result of the proof, the algebraic approach to time–derivative estimation is traced back, equivalently, to state estimation using the reconstructibility Gramian of the dynamic system, here, with respect to a particular nilpotent time–invariant input–free linear system. Additionally, the close relationship of the algebraic approach with least–squares time–derivative estimation is pointed out. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Remark on Finite‐Time Hyperbolicity
Authors: Berger A. , Doan T. S. , Siegmund S. 
Published: February 2009

AbstractWe discuss two notions of hyperbolicity for finite–time linear differential equations. The first notion (D–hyperbolicity) is based on the dynamic (or EPH) partition, the second (M–hyperbolicity) is motivated by exponential dichotomies. We study conditions under which D–hyperbolicity implies M–hyperbolicity. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Switching Stability of Automotive Roll Dynamics Subject to Interval Uncertainty
Authors: Solmaz Selim , Shorten Robert , Mason Oliver 
Published: February 2009

AbstractIn this paper we apply some recent results on the stability of switched systems with interval uncertainty for analyzing the roll stability of automotive vehicles subject to bounded parametric uncertainties and switching. The application is motivated by the fact that the roll dynamics of an automotive vehicle is affected in a significant and a nonlinear fashion due to possible sudden switches in the vehicle's center of gravity (CG) height, as well as the uncertainty in the suspension parameters. Utilizing a recent stability result, it is possible to model such parametric variations as bounded interval uncertainties for this problem, and obtain easily verifiable conditions for analyzing the stability of the resulting switched/uncertain system. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Singularities in Gaussian scale space that are relevant for changes in its hierarchical structure
Authors: Kuijper A. 
Published: February 2009

AbstractThe Gaussian scale space for an n–dimensional imageL(x) is defined as itsn+1 dimensional extensionL(x,t) being the solution of ∂tL=ΔL,Lt=0=L(x). A hierarchical structure inL(x,t) is derived by combining the critical curves (∇xL(x,t)=0) and special points on them, viz. catastrophe points (where detH=0,Hbeing the Hessian matrix) and scale space saddles (where ΔL=0), with iso–intensity manifolds through the scale space saddles. Until now, this structure has only been used for topological segmentation.In order to perform image matching and retrieval tasks based on the hierarchical structure, one needs to know which transitions are allowed when the structure is changed under influence of one control parameter. In this way, the gradual change of one structure into another is described. In this work we describe such relevant possible transitions for the hierarchical structure. These transitions describe the creations and annihilations of catastrophe points and scale space saddles, as well as their interaction with iso–intensity manifolds. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Thermomagnetic convection in magnetic fluids influenced by a time‐modulated magnetic field
Authors: Engler Harald , Odenbach Stefan 
Published: February 2009

AbstractMaterial– and flow properties of magnetic fluids can be influenced by applying an external magnetic field. In this work we will particularly consider the onset of convection in magnetic fluids which is influenced by a magnetic force. In a horizontal magnetic fluid layer the force arises if a temperature gradient and an external magnetic field is applied. The behaviour of the onset of convection is investigated for a static and a time–modulated magnetic field. For the case of a static magnetic field the onset of convection depends on the strength of the field and for a time–modulated magnetic field an additional dependence on the frequency of magnetic field variation is found. The experimental results presented here confirm in principle the theoretical predictions about the influence of static and time–modulated magnetic forces on the onset of convection. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A numerical study of flows driven by a rotating magnetic field in a square container
Authors: Fraňa K. , Stiller J. , Horáková K. 
Published: February 2009

AbstractThe influence of the geometry on the magnetically driven flow is studied by means of numerical simulations. Low–frequency, low–induction and low–interaction conditions are assumed. The rotating magnetic field (RMF) gives rise to a time–independent magnetic body force, computed via the electrical potential equation and Ohm's law and a time–dependent part that is neglected due to the low interaction parameter. Flow results of the cylindrical and square container are compared with respect to the magnetic body force, time–averaged velocity fields, first flow instabilities and Reynolds stress tensors. The dependency of the maximal velocity magnitude and the intensity of the magnetic induction is identical in axisymmetric and non–axisymmetric containers and in good agreement with Davidson's theory. However, significant differences are recognized, for instance, in the distribution of the Reynolds stress tensors. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Result Verification of RRT‐based Single‐Query Path Planning through Interval Analysis
Authors: Grimm Cornelius 
Published: February 2009

AbstractSingle–query path planning is still an open research field. A very promising approach is the use of Rapidly–exploring Random Trees (RRTs). In this approach two RRTs are constructed, one starting from the initial configuration and one from the goal configuration. In comparison with other approaches, this methodology is very efficient in high–dimensional configuration spaces.However, a naive implementation of this approach results in reliability problems: For the construction of an RRT, only discrete configurations are tested for feasibility, while continuous transitions between configurations are not. Furthermore, numerical computations are performed in a floating point arithmetic without accounting for round–off errors. In this work an advanced algorithm will be presented that incorporates interval analysis to eliminate these problems and yield reliable results. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Zur Geschichte der Vitamin‐Mangelerkrankungen. Skorbut, Rachitis und Co.
Authors: Staiger Christiane 
Published: February 2009

AbstractVitamin‐Mangelerkrankungen waren viele Jahrtausende eine Geißel der Menschheit. Skorbut raffte in der Seefahrt viele Menschen dahin, an Land starben Unzählige in Epidemien von Rachitis oder Beri‐Beri. Erst die Entdeckung der Vitamine als essentielle Nahrungsbestandteile ebnete den Weg zur rationalen Therapie.
Vitamine – ein Frage‐ und Antwort‐Spiel zwischen einer jungen Studentin und einem alten Professor. Bleibendes und Aktuelles, leicht lesbar aufbereitet
Authors: Roth Hermann J. 
Published: February 2009

AbstractDa die Frage die wertvollste Sprachleistung des Menschen ist, die entweder ein Gespräch nach sich zieht, eine Erläuterung verlangt oder zum Nachdenken herausfordert, sollen die zum Thema Vitamine gehörenden Begriffe, Definitionen, Anschauungen, Fakten und Vorstellungen interrogativ behandelt werden.
Vitamine und Spurenelemente in der parenteralen Ernährung. Theoretische Hintergründe und praktische Tipps
Authors: Vetter Kathy 
Published: February 2009

AbstractDie Notwendigkeit der Zufuhr von Vitaminen und Spurenelementen während einer parenteralen Ernährung zur Vermeidung von Mangelzuständen ist unbestritten und gängige Praxis. Auf Grund der eingeschränkten Möglichkeiten zur Festlegung des individuellen Bedarfs der Mikronährstoffe gibt es derzeit aber größtenteils nur Schätzwerte für eine angemessene Zufuhr. Es fallen außerdem zum Teil erhebliche Diskrepanzen bei den Empfehlungen der einzelnen Fachgesellschaften auf. Hier bedarf es ebenso wie zum Zeitpunkt des Substitutionsbeginns entsprechender Studien. Bei der praktischen Umsetzung kann sich der Apotheker bezüglich Herstellung, Fragen zu (In‐)Kompatibilitäten, Stabilitäten und Bioverfügbarkeiten einbringen und so zu einer bestmöglichen Versorgung der Patienten beitragen.
Fetal abnormalities leading to third trimester abortion: nine‐year experience from a single medical center
Authors: Barel Oshri , Vaknin Zvi , Smorgick Noam , Reish Orit , Mendlovic Sonia , Herman Arie , Maymon Ron 
Published: February 2009

AbstractObjectiveTo assess fetal abnormalities and events leading to third‐trimester abortion.MethodsThe study population included all parturient women with singleton pregnancy that underwent termination of pregnancy (TOP) in the third trimester in our institute because of fetal indications between 1998 and 2006.ResultsThere were 777 cases of TOP due to fetal anomalies in our center during the study period, and 52 terminations were carried out in the third trimester. All cases of third‐trimester abortions were due to severe malformations with high probability of perinatal death or severe handicap: 65.3% anomalies were structural, and 58.9% of them involved the central nervous system (CNS). Genetic indications included mostly genetic diseases, unlike aneupluidities in earlier terminations. Routine prenatal care raised suspicion of abnormalities in 22 (42.3%) cases, and diagnosis was established by additional tests. Abnormal findings were either missed in 4 (7.7%) cases or developed later in 11 (21.1%) cases. No routine prenatal screening was performed in the remaining 15 (28.8%) cases.ConclusionsThird‐trimester abortion may be obviated by timely screening and scanning in some cases. The possibility of late TOP should be considered in malformations occurring late in pregnancy and in cases that require meticulous evaluation and follow‐up from earlier stages of gestation. Copyright © 2009 John Wiley & Sons, Ltd.
Clinical outcome and placental territory ratio of monochorionic twin pregnancies and selective intrauterine growth restriction with different types of umbilical artery Doppler
Authors: Chang Yao‐Lung , Chang Shuenn‐Dyh , Chao An‐Shine , Hsieh Peter C. C. , Wang Chao‐Nin , Wang Tzu‐Hao 
Published: February 2009

AbstractObjectiveTo evaluate the clinical outcome and placental territory ratio in monochorionic diamniotic (MCDA) twin pregnancies and selective intrauterine growth restrictions (sIUGR) with different types of umbilical artery (UA) Doppler.Study DesignAn MCDA twin pregnancy with sIUGR was defined as a fetal weight below the 10th percentile in one twin. MCDA twins were divided into three groups: without IUGR (group I); with sIUGR, and a normal UA Doppler (group II); or an abnormal UA Doppler (persistent absence or reverse of end‐diastolic velocity) (group III). Placental territory was calculated as the estimated individual placental mass/total placenta weight.ResultsAltogether, 27 cases of group I, 11 cases of group II and 13 cases of group III MCDA twins were included. The placenta territory of the IUGR twin in group III MCDA twin was the smallest among the three groups of MCDA twins (ANOVA test, p < 0.001). There was incidence of neonatal death in six (6/26) of group III MCDA fetuses, while none in groups I and II MCDA twins did.ConclusionsIn MCDA twins with sIUGR, abnormal UA Doppler in the IUGR twin may reflect a more severe unequal placenta share and poorer neonatal outcomes. The prognosis of group II MCDA twins, even with sIUGR found in early gestation, is, by contrast, better. Copyright © 2009 John Wiley & Sons, Ltd.
Reporting Down syndrome screening results: women's understanding of risk
Authors: Nagle Cate , Hodges Ryan , Wolfe Rory , Wallace Euan M. 
Published: February 2009

AbstractObjectivesTo compare women's understanding of different methods of expressing Down syndrome risks.MethodsA self‐administered structured questionnaire given to 311 English‐speaking women postpartum, at three maternity units. Understanding of numeric risk expression was assessed by women identifying whether a specified risk was higher, lower or the same as another nominated risk, expressed as two percentages, as two ratios or one of each. Perceptions of a high‐risk result were obtained using display rankings of percentages and ratios.ResultsResponse rate was 95% (294/311). Overall, women were poor comparing numeric risks whether expressed similarly (ratio vs. ratio or percentage vs. percentage) or not. When comparing similarly expressed risks, 66% (95% CI: 62–70%) of respondents were correct, considerably more than when asked to compare different risk expressions 30% (95% CI: 26–34%), P < 0.0001. Women were more tolerant of risk when expressed as a percentage than as a ratio (median high risk for percentage form was 5% (1:20) and for ratio form was 1:200 (0.5%).ConclusionsWomen's understanding of Down syndrome risk is dependent upon how risks are expressed. These findings may usefully direct how risk should be reported to women having prenatal screening for Down syndrome. Copyright © 2009 John Wiley & Sons, Ltd.
Preimplantation genetic diagnosis for BRCA1/2—a novel clinical experience
Authors: Sagi M , Weinberg N , Eilat A , Aizenman E , Werner M , Girsh E , Siminovsky Y , Abeliovich D , Peretz T , Simon A , Laufer N 
Published: February 2009

AbstractObjectiveTo describe our 2‐year experience with preimplantation genetic diagnosis (PGD) for carriers of mutations in the genes BRCA1 and BRCA2, the dilemmas incurred and the lessons learned.MethodsWe collected data on those carriers of BRCA1/2 mutations who applied for PGD counseling and who decided to proceed. We describe the PGD procedures that were conducted and their outcome.ResultsTen carriers of BRCA1/2 mutations applied for PGD counseling, seven were healthy, and three were BC survivors. Eight women needed in vitro fertilization (IVF) because of coexisting infertility. After counseling, six opted for the procedure and five of them underwent PGD for the BRCA mutation. In one of these PGD, fluorescence in situ hybridization (FISH) analysis for chromosomes 21, X and Y was also performed. Three women conceived, each in the first treatment attempt. One of them gave birth to twins, the second to a singleton and the third is currently pregnant. During the pregnancies, dilemmas concerning PGD confirmation were discussed.ConclusionsPGD is an acceptable reproductive option for BRCA mutation carriers, especially for those who require IVF due to fertility problems. Discussion of this option should be carried out with sensitivity, taking into account the age of the woman, her health, fertility status and emotional state. Confirmatory prenatal diagnosis may not always be encouraged. Copyright © 2009 John Wiley & Sons, Ltd.
Blood pressure reduction in hypertensive patients after withdrawal of effervescent medication
Authors: Ubeda Amalia , Llopico Javier , Sanchez M. Teresa 
Published: February 2009

AbstractBackgroundRaised blood pressure associated with the sodium excipient content of soluble or effervescent analgesic has been previously reported. However, the influence of other anions associated with sodium on blood pressure is still controversial.MethodsObservational study of elderly hypertensive patients with uncontrolled blood pressure treated with effervescent paracetamol (3 g/day) for osteoarthritis. Blood pressure was measured before and after (4 weeks or more) switching paracetamol from an effervescent format to a tablet form in 34 patients. Blood pressure was recorded by community pharmacists during a pharmacotherapeutic follow‐up service.ResultsSodium intake in an effervescent form was 74 mmol/day (mainly associated with sodium bicarbonate and carbonate excipients). Initial blood pressure was high (range: 153–168 mmHg systolic and 92–99 mmHg diastolic). Switching to paracetamol tablets (no sodium content) was associated with both lowered systolic pressure of 13.1 mmHg (95%CI: 11.9–14.3, p < 0.0001) and a moderate reduction of diastolic pressure of 2.5 mmHg (95%CI: 2.1–2.9, p < 0.0001). No changes in medication in the study period took place, and weight and lifestyles remained stable. A detailed review of pharmacotherapy and lifestyle reveals no other causes for blood pressure to lower.ConclusionsA relationship of causality between the intake of high sodium excipients and high blood pressure in elderly hypertensive individuals, without chloride ions, was found. Clinicians should be aware of possible raised blood pressure when effervescent formulations are prescribed to hypertensive patients. Copyright © 2009 John Wiley & Sons, Ltd.
Psychological states and coping strategies after bereavement among the spouses of cancer patients: a qualitative study
Authors: Asai Mariko , Fujimori Maiko , Akizuki Nobuya , Inagaki Masatoshi , Matsui Yutaka , Uchitomi Yosuke 
Published: February 2009

AbstractObjective: Encouraging coping strategies that contribute to positive psychological states in bereaved individuals is assumed to be desirable; however, little is known about the components of positive psychological states and bereavement‐specific coping strategies. The purpose of this study was to describe the components of psychological states and coping strategies after bereavement among the spouses of cancer patients.Methods: Semi‐structured interviews were conducted among bereaved spouses of cancer patients. Meaning units of the psychological state and coping strategy in the interview records were grouped into categories and themes based on their similarities using content analysis and constant comparison methods. Negative/positive psychological states and general/bereavement‐specific coping strategies were identified by discussion among the authors. The number of participants who responded to each category was determined by two raters who were unaware of the categorized procedure.Results: Seven men and 17 women participated in the interviews. Forty‐two categories of psychological states identified from 784 meaning units were grouped into six themes: ‘Anxiety’, ‘Yearning’, ‘Anger’, and ‘Depression’ were negative psychological states, while ‘Acceptance’ and ‘Future‐oriented Feelings’ were positive psychological states. Thirty‐three categories of coping strategies identified from 559 meaning units were grouped into six themes: ‘Avoidance’, ‘Distancing’, ‘Emotional Expression’, and ‘Seeking Support’ were general coping strategies, while ‘Continuing Bonds’ and ‘Reconstruction of Life’ were bereavement‐specific coping strategies.Conclusions: Several original components of positive psychological states after bereavement and bereavement‐specific coping strategies were identified, whereas most of the other components were consistent with previous studies. Copyright © 2009 John Wiley & Sons, Ltd.
Solvothermal fabrication of ZnO nanorods using ethanolic quantum dot precursors
Authors: Hara Yukihiro , Brownson Jeffrey , Anderson Marc 
Published: February 2009

AbstractZnO nanorods were obtained by solvothermal reaction using quantum dot precursors suspended in ethanol. The ZnO suspensions were prepared from ethanolic zinc acetate solutions in the presence of lithium hydroxide, and treated by solvothermal synthesis under different reaction temperatures and duration times. Parameters of processing of these nanorods were investigated, including the concentration of precursors and solvothermal temperature. The ZnO nanorod powders were characterized by XRD, SEM, TEM, FT‐IR, thermal analysis, and isothermal N2(g) adsorption analyses. Commercially available ZnO nanopowders were studied for comparison. Resulting ZnO nanorod powders were pure ZnO and showed higher surfaces area than commercial ZnO nanopowders. Length and diameter of ZnO nanorods depended on the concentration of precursors and the annealing temperature employed. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Growth and electrical properties of ZnO films prepared by chemical bath deposition method
Authors: Chu Dewei , Hamada Takahiro , Kato Kazumi , Masuda Yoshitake 
Published: February 2009

AbstractThe influence of the choice of temperature, pH value, counter‐ion, deposition time, and seed layer on the morphology as well as electrical properties of ZnO films grown from chemical bath deposition (CBD) are discussed. Consequently, oriented ZnO films with various microstructures can be synthesized by controlling the solution pH value and counter‐ions. Besides, the point at which the seed layer is pre‐heated at higher temperature is crucial and can lead to a significant difference in the width of crystals and electrical properties of ZnO films. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)