bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculations of return loss of bonding wires fabricated on a test board by FDTD method
Authors: Chen Hsing‐Yi , Su Chieh‐Pin 
Published: April 2007

AbstractReturn losses of bonding wires fabricated on a test board for RF and microwave circuit applications are studied by the finite‐difference time‐domain (FDTD) method. Simulation results of return losses obtained by the FDTD method are presented and compared with those obtained by the HFSS software and measurements at frequencies of 0.04–6 GHz. It is found that simulation results calculated by the FDTD method make a good agreement with those obtained by the HFSS software. Results of the FDTD method are also further validated by the measurement data. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1603–1606, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22546
Synovial fluid at microwave frequencies
Authors: Lonappan Anil , Thomas Vinu , Bindu G. , Rajasekaran C. , Mathew K. T. 
Published: April 2007

AbstractArthritis is one of the most pervasive diseases that causes of disability. For most people arthritis pain and inflammation cannot be avoided as the body ages. The present communication reports the study on the synovial fluid has the main lubricant in joints collected from normal persons and those ailing from arthritis are subjected to the microwave study and the variations of the dielectric parameters are investigated. The in vitro measurements of synovial fluid samples are done using cavity perturbation technique in the frequency range of 2–3 GHz. It is observed that in this band, the dielectric constant of normal samples are higher than those of arthritis affected ones and conductivity of is higher in normal samples, which finds application in detecting arthritis using microwaves. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1700–1702, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22552
A low‐profile planar antenna for DVB‐H terminals
Authors: Li R. L. , Pan B. , Laskar J. , Tentzeris M. M. 
Published: April 2007

AbstractA low‐profile planar antenna has been developed for UHF‐band DVB‐H terminals. The antenna has a height of 8 mm and can be easily integrated with a printed circuit board. Through the exploitation of the electromagnetic coupling between a T‐strip and an S‐strip, the antenna can radiate efficiently over a wide frequency band. It has been demonstrated that the antenna can achieve a gain of −2 to −4 dBi over the DVB‐H band (470–702 MHz), which is 3–7 dB higher than the standard specification. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1630–1633, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22556
A simple K‐band waveguide‐to‐microstrip probe transition
Authors: Navarrini Alessandro , Pisanu Tonino , Mariotti Sergio , Idda Tonio 
Published: April 2007

AbstractWe describe the design, construction, and test of a simple K‐band waveguide‐to‐microstrip transition based on a radial‐shaped probe patterned on a quartz substrate. From 16 to 28 GHz, the measured reflection coefficient at the coaxial SMA input, used for test purposes of the adapter, was less than −14 dB, and the dissipative loss was ∼0.30 dB. The estimated loss of the waveguide to microstrip transition only, with coaxial connector effects removed, is ∼0.08 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1597–1600, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22558
A low‐noise UWB cmos mixer using current bleeding and resonant inductor techniques
Authors: Jung Goo‐Young , Shin Jae‐Hoon , Yun Tae‐Yeoul 
Published: April 2007

AbstractThis article presents a direct down‐conversion mixer for ultra‐wideband systems on 0.18 μm RF CMOS process. The proposed mixer uses a current bleeding technique and an internal resonant inductor to improve the conversion gain and noise figure of the conventional Gilbert‐cell mixer. Effects of each technique are compared on mixer's noise performance. Measured results show the conversion gain of 7.5–10.1 dB and the double side‐band noise figure of 8.8–12.5 dB at Band 1 (3.168–3.696 GHz) and the gain of −1.4 to 1.6 dB and the double side‐band noise figure of 12.2–17.6 dB at Band 13 (9.768–10.296 GHz). The circuit operates at the supply voltage of 1.8 V and dissipates 13.24 mW. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1595–1597, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22559
Dynamic data‐driven finite element models for laser treatment of cancer
Authors: Oden J.T. , Diller K.R. , Bajaj C. , Browne J.C. , Hazle J. , Babuška I. , Bass J. , Biduat L. , Demkowicz L. , Elliott A. , Feng Y. , Fuentes D. , Prudhomme S. , Rylander M. N. , Stafford R.J. , Zhang Y. 
Published: April 2007

AbstractElevating the temperature of cancerous cells is known to increase their susceptibility to subsequent radiation or chemotherapy treatments, and in the case in which a tumor exists as a well‐defined region, higher intensity heat sources may be used to ablate the tissue. These facts are the basis for hyperthermia based cancer treatments. Of the many available modalities for delivering the heat source, the application of a laser heat source under the guidance of real‐time treatment data has the potential to provide unprecedented control over the outcome of the treatment process (McNichols et al., Lasers Surg Med 34 (2004), 48–55; Salomir et al., Magn Reson Med 43 (2000), 342–347). The goals of this work are to provide a precise mathematical framework for the real‐time finite element solution of the problems of calibration, optimal heat source control, and goal‐oriented error estimation applied to the equations of bioheat transfer and demonstrate that current finite element technology, parallel computer architecture, data transfer infrastructure, and thermal imaging modalities are capable of inducing a precise computer controlled temperature field within the biological domain. © 2007 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 23: 904–922, 2007
Reliability of computational science
Authors: Babuška I. , Nobile F. , Tempone R. 
Published: April 2007

AbstractToday's computers allow us to simulate large, complex physical problems. Many times the mathematical models describing such problems are based on a relatively small amount of available information such as experimental measurements. The question arises whether the computed data could be used as the basis for decision in critical engineering, economic, and medicine applications. The representative list of engineering accidents occurred in the past years and their reasons illustrate the question. The paper describes a general framework for verification and validation (V&V) which deals with this question. The framework is then applied to an illustrative engineering problem, in which the basis for decision is a specific quantity of interest, namely the probability that the quantity does not exceed a given value. The V&V framework is applied and explained in detail. The result of the analysis is the computation of the failure probability as well as a quantification of the confidence in the computation, depending on the amount of available experimental data. © 2007 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 23: 753–784, 2007
Proteomic analysis of photosystem I components from different plant species
Authors: Zolla Lello , Rinalducci Sara , Timperio Anna Maria 
Published: April 2007

AbstractIn this study, the photosystem I (PSI) highly hydrophobic proteins present within stroma lamellae of the thylakoid membrane were separated by RP‐HPLC and identified either by in‐solution trypsin digestion peptide fragment fingerprinting or by the close correspondence between the intact mass measurements (IMMs) and those expected from the DNA sequence. Protein identification performed by MS/MS was as reliable as IMMs. Thus, IMM is an easy and valid method for identifying proteins that have no PTMs. This paper reports the Mr for all PSI proteins in ten different species, including those whose genes have not yet been cloned. Lhca5 was revealed unequivocally in four species, corroborating that it is indeed a protein belonging to the light‐harvesting antenna of PSI. In all species examined, the product of the Lhca6 gene has never been revealed. Concerning core proteins, Psa‐O has been revealed in three species; isoforms of Psa‐D and Psa‐E have been found in both monocots and dicots. Small proteins like Psa‐I and Psa‐J are well separated and identified. RP‐HPLC produces reliable fingerprints and reveals that the relative amounts of PSI proteins appear to be markedly different.
Toward a better analysis of secreted proteins: the example of the myeloid cells secretome
Authors: Chevallet Mireille , Diemer Hélène , Van Dorssealer Alain , Villiers Christian , Rabilloud Thierry 
Published: April 2007

AbstractThe analysis of secreted proteins represents a challenge for current proteomics techniques. Proteins are usually secreted at low concentrations in the culture media, which makes their recovery difficult. In addition, culture media are rich in salts and other compounds interfering with most proteomics techniques, which makes selective precipitation of proteins almost mandatory for a correct subsequent proteomics analysis. Last but not least, the non‐secreted proteins liberated in the culture medium upon lysis of a few dead cells heavily contaminate the so‐called secreted proteins preparations. Several techniques have been used in the past for concentration of proteins secreted in culture media. These techniques present several drawbacks, such as coprecipitation of salts or poor yields at low protein concentrations. Improved techniques based on carrier‐assisted TCA precipitation are described and discussed in this report. These techniques have been used to analyze the secretome of myeloid cells (macrophages, dendritic cells) and enabled to analyze proteins secreted at concentrations close to 1 ng/mL, thereby allowing the detection of some of the cytokines (TNF, IL‐12) secreted by the myeloid cells upon activation by bacterial products.
The contribution of attachment security and social support to depressive symptoms in patients with metastatic cancer
Authors: Rodin Gary , Walsh Andrew , Zimmermann Camilla , Gagliese Lucia , Jones Jennifer , Shepherd Frances A. , Moore Malcolm , Braun Michal , Donner Allan , Mikulincer Mario 
Published: April 2007

AbstractThe present study examines the association between disease‐related factors, perceived social support, attachment security (i.e. attachment anxiety and avoidance), and the occurrence of depressive symptoms in a sample of patients with metastatic gastrointestinal or lung cancer. Results from a sample of 326 cancer outpatients with advanced disease indicate that disease‐related factors are significantly associated with the occurrence of depressive symptoms, and the latter are inversely related to the degree of attachment anxiety and avoidance, and perceived social support. Attachment security (on the dimension of anxious attachment) significantly buffered the effect of disease‐related factors on depressive symptoms, and perceived social support mediated the relationship between attachment security and depressive symptoms. The buffering effect of attachment security on depressive symptoms and its partial mediation through social support suggest that the interaction of individual, social, and disease‐related factors contribute to the emergence of depressive symptoms in patients with metastatic cancer. Copyright © 2007 John Wiley & Sons, Ltd.
Thermoelectric effects in STM tunneling through a monoatomic chain
Authors: Krawiec M. , Jałochowski M. 
Published: April 2007

AbstractWe study thermoelectric properties of the system composed of a monoatomic chain on a surface and additional electrode coupled to the chain, which can be an STM tip. In particular, we are interested in thermopower, electric and thermal conductance, Wiedemann–Franz relation and thermoelectric figure of merit, which is a direct measure of the usefulness of the system for applications. We discuss the modifications of the STM wire topography due to temperature difference between the electrodes. Finally, we also make connection to STM experiment, in which the thermopower has been directly measured, showing different structure, not visible in topography spectra. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Bottom‐up approach to high‐temperature superconductivity
Authors: Won Hyekyung , Haas Stephan , Maki Kazumi 
Published: April 2007

AbstractSince the discovery of high‐temperature superconductivity in the cuprates a theoretical understanding of their phase diagram has remained one of the major outstanding problems in condensed matter physics. Here we propose an effective low‐energy Hamiltonian which produces both d‐wave density wave (dDW) and d‐wave superconducting (dSC) solutions within the BCS mean‐field theory. This model predicts that (a) the observed pseudogap phase is a dDW state, (b) the superconducting phase is a d‐wave BCS state, and (c) in the underdoped regime there is a gossamer superconducting state, i.e. dSC in coexistence with dDW. Moreover, this theory naturally explains the Uemura relation, the reduction of the quasiparticle density of states at the Fermi level, and the salient features in the tunneling conductivity measured in underdoped Bi2212. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Shell structures and electron‐spin configurations in single‐walled carbon nanotube quantum dots
Authors: Moriyama S. , Fuse T. , Ishibashi K. 
Published: April 2007

AbstractWe have carried out low‐temperature transport measurements in individual carbon nanotube quantum dots. Two‐ and four‐electron shell structures have been carefully investigated, and the magnetic field evolution of the single‐electron transport spectroscopy has revealed the electron‐spin configurations in the dot. Our experimental results reveal that the carbon nanotube quantum dot is an artificial atom that exhibits shell filling and is the simplest example of the Hund's rule. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The effective‐site percolation approach in two dimensions
Authors: Pawłowski G. 
Published: April 2007

AbstractA new Monte Carlo cluster approach to describe the order–order and order–disorder transitions in two‐dimensional (2D) correlated systems is presented. It is shown that a phase transition of a physical system can be correctly described in terms of the percolation language of the effective‐site approach. In contrast to the well‐known bond approaches, the method proposed does not require additional assumptions as to the acceptance of the bonds. The new idea is based on the site approach to elementary ordered plaquettes, leading to the accurate coincidence of percolation and the phase transitions in 2D. Here I present the analysis of the spin‐system in the Blume–Capel model and the charged‐system in the atomic limit of the extended Hubbard model. In both cases the interpretation of the phase transition is made in terms of the percolation of different types of order. The new method allows precise identification of the pure and mixed phases. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Tight binding analogue of cyclotron orbits
Authors: Wal A. 
Published: April 2007

AbstractThe magnetic translation group describes the symmetry of the itinerant electron on two‐dimensional lattice with perpendicular magnetic field. For such a finite system, with periodic condition the properties of the irreducible representations of this group are responsible for the tight‐binding analogue of cyclotron orbits of the free electron case. The relation between the size of the planar lattice and the structure of the group and its irreducible representations is pointed out. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Magnetic phase diagram of the anisotropic multi‐band Hubbard model
Authors: van Dongen P. G. J. , Knecht C. , Blümer N. 
Published: April 2007

AbstractUsing quantum Monte Carlo (QMC) simulations we determine the magnetic phase diagram of the anisotropic two‐band Hubbard model within the dynamical mean‐field theory (DMFT) in the important intermediate‐coupling regime. We compare the QMC predictions with exact results from second‐order weak‐ and strong‐coupling perturbation theory. We find that the orbital‐selective Mott transition (OSMT), which occurs in the fully frustrated case, is completely hidden in the antiferromagnetic (AF) ground state of the model. On the basis of our results, we discuss possible mechanisms of frustration. We also demonstrate the close relationship of the physics of the two‐band Hubbard model in the orbital‐selective Mott (OSM) phase to the Falicov–Kimball model. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Fibre structure of a model manifold of classical configuration space in Bethe ansatz
Authors: Milewski J. , Lulek B. , Lulek T. 
Published: April 2007

AbstractWithin Bethe ansatz approach, the system of r Bethe pseudoparticles on a magnetic ring of N nodes is characterised by a finite set of magnetic configurations which can be interpreted as a classical configuration space. This space can be embedded into r ‐dimensional manifold. Here we present the fibre bundle structure of this model manifold. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Ergot alkaloids in Norwegian wild grasses: a mass spectrometric approach
Authors: Uhlig Silvio , Vikøren Turid , Ivanova Lada , Handeland Kjell 
Published: April 2007

AbstractErgot alkaloids are mycotoxins which are produced among fungi in the family Clavicipitaceae. Poisoning with ergot alkaloids is an important veterinary problem in animal husbandry and has recently also been recognised in wild animals. While the poisoning syndrome observed in domestic animals such as cattle, horses and sheep is usually caused by endophyte‐infected grass, the recently observed ergotism among Norwegian cervids is probably due to infection of wild grasses with Claviceps. Mass spectrometry is today the method of choice for the rapid qualitative and quantitative determination of many natural compounds. This study uses tandem quadrupole mass spectrometry as well as ion trap mass spectrometry in connection with electrospray(+) ionisation for the quantification, screening and fragmentation of ergot alkaloids in extracts from Claviceps sclerotia that had been picked from wild grasses from several locations in Norway. Ergotamine, ergovaline, ergonovine and ergocryptine were available as standards and were quantified in the extracts, while ergocrystine, ergocornine, ergonine/ergosine, lysergic acid and lysergol were identified on the basis of their molecular weights and semi‐quantified. Ergocrystine dominated the alkaloid spectrum of most extracts. Levels of the quantified alkaloids were in the range 0.2–9300 µg/g. Several unknown ergot alkaloids were found in the extracts. MSn experiments identified some as simple lysergic acid amide derivatives, while othes are probably related to ergocrystine and ergocryptine by dehydration, dehydrogenation and/or amino acid substitution at R1 of the peptide moiety. Copyright © 2007 John Wiley & Sons, Ltd.
A method for testing the significance of geographical correlations with application to industrial lung cancer in France
Authors: Richardson Sylvia 
Published: April 2007

AbstractThis paper discusses some of the problems encountered when testing significance in geographical epidemiology where variables typically exhibit some spatial autocorrelation. A test of partial correlation between spatially autocorrelated variables is presented. It is based on evaluation of an effective sample size which takes account of spatial structure. Performance is assessed by Monte Carlo simulation. The proposed method is used to study male lung cancer rates in specific industries in France.
Maximum likelihood estimation of reference centiles
Authors: Thompson M. L. , Theron G. B. 
Published: April 2007

AbstractWe propose the use of centile estimates which are based on the fitting of appropriate densities by maximum likelihood. In the case of cross‐sectional centile estimation, we show that this approach will generally lead to more precise estimates than would result from the use of non‐parametric centile estimates. When longitudinal data are available or a series of cross‐sectional data at different time points, the maximum likelihood approach can be used to simultaneously fit densities to each cross‐section, subject to constraints (for example, smoothness constraints) on the parameters. The variances of these centile estimates are readily obtained and missing values and unequally spaced records are easily accommodated. We illustrate the procedure by means of an application using the Johnson family of densities to a study of weight gain in pregnancy.
Outlier detection in bioavailability/bioequivalence studies
Authors: Chow Shein‐Chung , Tse Siu‐Keung 
Published: April 2007

AbstractThis paper concerns techniques for detection of a potential outlier or extreme observation in a bioavailabi1ity/bioequivalence study. A bioavailability analysis that includes possible outlying values may affect the decision on bioequivalence. We consider a general crossover model that takes into account period and formulation effects. We derive two test procedures, the likelihood distance and the estimates distance, to detect potential outliers. We show that the two procedures relate to a chi‐square distribution with three degrees of freedom. The main purpose of this paper is to exhibit and discuss these two general approaches of outliers detection in the context of a bioavailability/bioequivalence study. To illustrate these approaches, we use data from three‐way crossover experiment in the pharmaceutical industry that concerned the comparison of the bioavailability of two test formulations and a standard (reference) formulation of a drug. This example demonstrates the influence of an outlying value in the study of bioequivalence.
Latent class analysis of diagnostic agreement
Authors: Uebersax John S. , Grove William M. 
Published: April 2007

AbstractWe describe methods based on latent class analysis for analysis and interpretation of agreement on dichotomous diagnostic ratings. This approach formulates agreement in terms of parameters directly related to diagnostic accuracy and leads to many practical applications, such as estimation of the accuracy of individual ratings and the extent to which accuracy may improve with multiple opinions. We describe refinements in the estimation of parameters for varying panel designs, and apply latent class methods successfully to examples of medical agreement data that include data previously found to be poorly fitted by two‐class models. Latent class techniques provide a powerful and flexible set of tools to analyse diagnostic agreement and one should consider them routinely in the analysis of such data.
Randomized consent designs for clinical trials: An update
Authors: Zelen M. 
Published: April 2007

AbstractRandomized consent designs were introduced to make it easier for physicians to enter patients in randomized clinical trials. Physician reluctance to participate in randomized clinical trials is often a reflection that the physician‐patient relationship could be compromised if the physician makes known to the patient his/her inability to select a preferred therapy. Clinical trials having a no‐treatment control or placebo amplify this concern. This paper reviews the main ideas of randomized consent designs (single and double) and the statistical model underlying the analysis, and presents some recent experiences.