bluuebunny/crossref_metadata_2025_split huggingface dataset:
Broadband quadrature coupler with slotted ground plane
Authors: Abbosh Amin M. 
Published: December 2007

AbstractThe design of an edge‐coupled quadrature directional coupler, which has a broadband performance and relaxed coupled‐line spacing, is presented. A slotted ground plane is used underneath the coupled region in order to relax the requirement for a narrow slot between the coupled lines. The simulated and measured results show that the designed coupler exhibits a coupling of 3 ± 1 dB across the band 3.8 GHz to 9.8 GHz, when the spacing between the coupled lines is 0.12 mm. Without the slot in the ground plane, the spacing should be less than 0.001 mm to achieve the same value of coupling across that band. This broadband coupling is accompanied by an isolation and return loss in the order of 13 dB or better across the band 3–10 GHz. The designed device has a compact size with a dimension of 30 mm × 20 mm. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 328–331, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23080
Printed holey plate Luneburg lens
Authors: Xue L. , Fusco V. F. 
Published: December 2007

AbstractA printed Luneburg lens whose permittivity distribution is controlled by photo lithographically etching holes of different sizes into one side of a PCB ground plane is reported. The lens designed to operate in TE01 mode has a measured −3‐dB beamwidth of 5.2° with 14.2‐dB gain at 27.22 GHz for a 12.2λ, 13.4‐cm diameter lens. Its low profile, 3.175‐mm thickness, 85 g, ±20° scanning range, and 15% bandwidth makes it useful for land mobile telemetry and vehicular applications in the millimeter waveband. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 378–380, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23087
Particle swarms applied to array synthesis and planar near‐field antenna measurements
Authors: Pérez J. R. , Basterrechea J. 
Published: December 2007

AbstractThe usefulness and limitations of several particle swarm optimization schemes when applied to linear array synthesis considering directive element patterns and to antenna far‐field pattern reconstruction from planar near‐field acquisition are presented. Particle swarm optimization with either synchronous or asynchronous updates of the swarm as well as global or local topologies have been considered. For both applications, results comparing the four optimization techniques are reported and discussed. Finally, results considering complex and phase‐only linear array synthesis, along with results of near‐field to far‐field transformation for a pyramidal horn are also included. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 544–548, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23089
Design of capacitive coupled resonator microstrip filter
Authors: Mandeep J. S. , Prabhu  , Jovanovic S. 
Published: December 2007

AbstractA microstrip bandpass filter with a new type of capacitive‐coupled resonator is presented. The filter is designed to be smaller compared with the same type of parallel‐coupled bandpass filter. The filter is designed for a centre frequency of 2.5 GHz that lies in the S‐band frequency range. The insertion loss at fo is 2.4 dB and the measured 3‐dB bandwidth is 8.6%. The agreement between the predicted and measured results is excellent, and even the circuit simulator gives a very good prediction for the filter characteristics. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 460–462, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23094
A compact UWB bandpass filter with a wide upper stopband using multiple transmission zeros
Authors: Hon Kuan , Min‐Hang Weng 
Published: December 2007

AbstractIn this article, a compact bandpass filter is proposed for lower band (3.1–4.9 GHz) of ultra‐wideband applications. The filter is mainly composed of a pseudo‐interdigital wideband bandpass filter (PI‐WBF) and a multiple transmission‐zeros structure (MTZS), being a bandstop filter. By using the MTZS, multiple transmission zeros can be located in the upper stopband of the PI‐WBF. The design procedure is discussed in detail. The designed filter was fabricated and measured. Measured results also have a good agreement with the simulated results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 380–382, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23103
New λ/2 microstrip bandpass filters using skew‐symmetric feed structure
Authors: Zhu Yong Zhong , Xie Yong Jun 
Published: December 2007

AbstractOne type of magnetic coupling filter using skew‐symmetric feed structure can create two transmission zeros in the upper stopband. The mixed coupling filter can generate one transmission zero lying on each side of the passband and the S11 spectrum is slightly asymmetrically shaped in the vicinity of the center frequency. A two‐pole hexagonal magnetic coupling filter using skew‐symmetric feed structure is designed and fabricated. The filter has a fractional bandwidth of 3% at 2.45 GHz. The transmission zeros are obtained in the upper stopband at f1 = 2.63 GHz and f2 = 2.97 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 440–442, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23108
Bandwidth enhancement of open slot antenna for UWB applications
Authors: Chen Wen‐Shan , Ku Kuang‐Yuan 
Published: December 2007

AbstractA novel open slot antenna for bandwidth enhancement is presented. The bandwidth enhancement of the proposed antenna is achieved by cutting two notches along the invert‐L shape open slot in the ground plane. The frequency range of the proposed antenna is from 2.3 to 10.9 GHz, which can cover the WLAN bands (2.4/5 GHz) and UWB frequency range (3.1–10.6 GHz). © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 438–4399, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23109
Cross‐coupled dual‐band filter using folded tri‐section stepped impedance resonators
Authors: Fan J. W. , Liang C. H. , Wu B. 
Published: December 2007

AbstractA compact dual‐band bandpass filter using folded tri‐section stepped impedance resonators (FTSIRs) is proposed in this article. Resonance characteristics of the tri‐section stepped impedance resonator (TSIR) are derived and described in detail. A cross‐coupled dual‐band filter for WLAN(2.4/5.2 GHz) is designed with four FTSIRs. The measurement of the filter is in good agreement with the simulation. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 407–409, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23110
Compact coaxial‐line‐fed flat‐plate dipole antenna for WLAN applications
Authors: Su Saou‐Wen , Chou Jui‐Hung 
Published: December 2007

AbstractA novel coaxial‐line‐fed flat‐plate dipole antenna for WLAN operation in the 2.4 GHz band is presented. The dipole antenna is rectangular in shape and can easily be fabricated by stamping a metal plate at low cost. The two radiating arms of the dipole antenna are first bent into a compact structure with the dimensions 10 mm × 38 mm and further short‐circuited with a narrow shorting strip, which allows the antenna to be obtained from one single, stamped metal plate only. In addition, good impedance matching for 2.4 GHz operation can also be achieved by controlling the distance between the feeding points and the shorting strip. The design prototype of the antenna is elaborated and discussed in detail in the article. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 420–422, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23116
Wideband bandpass filter of folded substrate‐integrated waveguide integrating with stripline compact resonant cell
Authors: Geng Liang , Che Wenquan , Deng Kuan 
Published: December 2007

AbstractA wideband bandpass filter constructed into folded substrate‐integrated waveguide (FSIW) is proposed, incorporating with the stripline compact resonant cell (CRC). The folded SIW preserves nearly the same propagation characteristics with its counterpart substrate‐integrated waveguide (SIW); however, the width of FSIW is only half of SIW, providing a more compact platform for many novel circuits or subsystems. A prototype of this wideband bandpass filter was fabricated and measured. Good agreements are observed between the experimental results and the simulations. The results demonstrate a wide passband about 83.7% (from 3.3 to 8.05 GHz) at −10 dB return loss and the insertion loss in the entire passband is less than 0.26 dB. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 390–393, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23117
Design of a dual‐mode bandpass filter with wide stopband performance for GPS application
Authors: Kuan Hon , Pan Heng‐Yau 
Published: December 2007

AbstractIn this article, we propose a dual‐mode bandpass filter (BPF) at 1.575 GHz using periodic meander slotted ground structures (M‐SGSs) which are etched on the ground plane for spurious suppression. First, single M‐SGS is analyzed. Second, the M‐SGSs are used to provide a good stopband‐rejection to the second harmonics of the dual‐mode BPF with level of over −40 dB. Finally, a dual‐mode BPF with improved stopband is designed, fabricated, and measured. The experimental results of the fabricated filter measured by the network analyzer have good agreement with the simulation results. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 445–447, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23123
Leaky mode dispersions of Goubau lines
Authors: Kim Ki Young 
Published: December 2007

AbstractThe leaky dispersion characteristics of a Goubau line were numerically investigated for three lower‐order transverse magnetic (TM) modes by determining a complex propagation constant using Davidenko's method. As a result, physically meaningful spectral ranges of leaky modes were found to exist below the cutoff frequency of the Goubau line. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 523–525, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23136
1H NMR study of internal motions and quantum rotational tunneling in (CH3)4NGeCl3
Authors: Mallikarjunaiah K. J. , Jugeshwar Singh K. , Ramesh K. P. , Damle R. 
Published: December 2007

Abstract(CH3)4NGeCl3 is prepared, characterized and studied using 1H NMR spin lattice relaxation time and second moment to understand the internal motions and quantum rotational tunneling. Proton second moment is measured at 7 MHz as function of temperature in the range 300–77 K and spin lattice relaxation time (T1) is measured at two Larmor frequencies, as a function of temperature in the range 270–17 K employing a homemade wide‐line/pulsed NMR spectrometers. T1 data are analyzed in two temperature regions using relevant theoretical models. The relaxation in the higher temperatures (270–115 K) is attributed to the hindered reorientations of symmetric groups (CH3 and (CH3)4N). Broad asymmetric T1 minima observed below 115 K down to 17 K are attributed to quantum rotational tunneling of the inequivalent methyl groups. Copyright © 2007 John Wiley & Sons, Ltd.
Origin of 13C complexation shifts in the adduct formation of 2‐butyl phenyl ethers with a dirhodium tetracarboxylate complex
Authors: Gómez Edison Díaz , Duddeck Helmut 
Published: December 2007

AbstractComplexation of the oxygen atom in 2‐butyl phenyl ethers to a rhodium atom of the dirhodium tetracarboxylate Rh(II)2[(R)‐(+)‐MTPA]4(Rh*, MTPA‐H = methoxytrifluoromethylphenylacetic acid ≡ Mosher's acid) deshields an sp3‐hybridized 13C nucleus directly bonded to the ether oxygen; apparently, the inductive effect of the oxygen is enhanced when it is complexed to the rhodium atom. On the other hand, deshielding complexation shifts of aromatic ipso‐carbons (α‐positioned) are minute but ortho‐ and para‐carbon signals are influenced by the resonance effect of oxygen. This effect can be modulated by further substituents at the benzene ring. In turn, this modulation of the resonance correlates linearly ith the magnitude of the inductive effect exerted on the aliphatic α–carbon atoms. Diastereomeric dispersion effects at 13C signals can be observed for most compounds, indicating that enantiodifferentiation is possible in this class of ethers. Copyright © 2008 John Wiley & Sons, Ltd.
Structural determination of two new sesquiterpenes biotransformed from germacrone by Mucor alternata
Authors: Jia Niu , Xiao Chi MA , Xiu Lan Xin , Hong Wei Jin , Dean Guo 
Published: December 2007

AbstractEight transformed sesquiterpenes of germacrone by Mucor alternata were obtained. Their structures were characterized on the basis of spectral methods including 2D NMR. Among them, (1S, 4S, 5S, 10R)‐isozedoarondiol (2) and (1R, 4S, 5S, 10R)‐diepoxy‐12‐hydroxygermacrone (3) are new compounds. Copyright © 2007 John Wiley & Sons, Ltd.
Proteomic analysis of bovine conceptus fluids during early pregnancy
Authors: Riding George A. , Jones Alun , Holland Michael K. , Hill Jonathan R. , Lehnert Sigrid A. 
Published: December 2007

AbstractA proteomic analysis of bovine amniotic and allantoic fluids collected around Day 45 of gestation was performed using gel‐based and LC‐based MS workflows. A depletion/enrichment protocol using ultrafiltration under denaturing and reducing conditions produced an enriched fraction containing protein species predominantly between 5 and 50 kDa molecular weight. The analyses of conceptus fluid proteins were performed using two strategies; first, 2‐DE coupled with MALDI‐TOF‐MS/MS and LC‐ESI‐MS/MS analysis of individual protein spots and second, a global protein snapshot of the enriched 5–50 kDa protein fraction by LC‐ESI‐MS/MS and LC‐MALDI‐TOF‐MS/MS. Allocation of bovine specific protein identities was achieved by searching the Interactive Bovine In Silico SNP (IBISS) and NCBInr protein sequence databases resulting in the confident PMF identification and MS/MS confirmation of >200 2‐DE generated allantoic fluids protein spots (74 individual protein species identified) and the MS/MS peptide identification of 105 LC‐ESI‐MS/MS generated protein identities. In total, the identity of 139 individual protein species from allantoic fluids was confirmed with peptide sequence probability MOWSE scores at the p<0.05 level or better. The comparison of bovine Day 45 amniotic and allantoic fluids protein profiles revealed differences between these two conceptus fluids in early pregnancy.
Use of 2‐D DIGE analysis reveals altered phosphorylation in a tropomyosin mutant (Glu54Lys) linked to dilated cardiomyopathy
Authors: Warren Chad M. , Arteaga Grace M. , Rajan Sudarsan , Ahmed Rafeeq P. H. , Wieczorek David F. , Solaro R. John 
Published: December 2007

AbstractCurrent electrophoretic methods have not been optimized to fully separate post‐translationally modified mutant forms of tropomyosin (Tm) from wild‐type cardiac samples. We describe here a method employing a modified 2‐D PAGE/2‐D DIGE protocol, to fully separate native, mutant (E54K), and phosphorylated forms of Tm. Our data demonstrate the first evidence of a significant (˜40%) decrease in Tm phosphorylation in transgenic compared to non‐transgenic mouse hearts, and indicate that altered phosphorylation may be a significant factor in the linkage of the E54K mutation to dilated cardiomyopathy.
Synthesis of hyperbranched polymer having binaphthol units via oxidative cross‐coupling polymerization
Authors: Temma Tomohisa , Habaue Shigeki 
Published: December 2007

AbstractThe oxidative coupling polymerization of triphenylamine derivatives having 2‐naphthol moieties with a CuCl‐2,2′‐isopropylidenebis(4‐phenyl‐2‐oxazoline) catalyst under an O2 atmosphere was carried out. The polymerization of the monomer bearing both the hydroxynaphthoate and naphthol units afforded a hyperbranched polymer with a high cross‐coupling selectivity of > 99%, which showed a number‐average molecular weight of 20.3 × 103. In addition, the obtained polymer was quite soluble in THF. The photoluminescence and electrochemical properties of the obtained polymers were also examined. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1034–1041, 2008
Evolution of dislocations in perylene films with thickness and deposition rate
Authors: Beigmohamadi M. , Niyamakom P. , Farahzadi A. , Kremers S. , Michely T. , Wuttig M. 
Published: December 2007

AbstractThe growth of perylene films on an amorphous oxide bottom layer is investigated. The perylene films show clear spiral growth and formation of screw dislocations. As a function of deposition rate and film thickness the densities of screw dislocations, grains as well as the roughness and the lateral correlation length are determined from AFM images. The evolution of microstrain as calculated from an XRD peak profile analysis corresponds to the dislocation density. The simultaneous decrease of grain density and dislocation density with film thickness is explained by considering the overgrowth of grains due to loss of dislocations acting as growth spirals. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)magnified image3.5 μm AFM images of 700 nm perylene film. Left: topography. Right: edge enhanced, showing steps and spiral growth. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Plasmon energy chemical phase mapping of reactive multilayers
Authors: Mat Yajid M. A. , Wagner T. , Möbus G. 
Published: December 2007

AbstractAn analytical method of quantitative phase identification and mapping on the nanoscale is presented based on correlative similarity mapping from spectrum images within electron energy loss spectroscopy across the low‐loss plasmon region. The method is applied to map the reaction layer formation for heat treated Cu–Al–Al2O3 thin films. Coexistence of residual Al pockets next to polycrystalline but epitaxial CuAl2 as main reaction product is found as well as a distinctive interfacial plasmon region. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Approaches for assessing hazards and risks to workers and the public from contaminated land
Authors: Gochfeld Michael , Burger Joanna , Friedlander Barry , Powers Charles 
Published: December 2007

AbstractMany public agencies and private entities are faced with assessing the risks to humans from contamination on their lands. The United States Department of Energy (US DOE) and Department of Defense are responsible for large holdings of contaminated land and face a long‐term and costly challenge to assure sustainable protectiveness. With increasing interest in the conversion of brownfields to productive uses, many former industrial properties must also be assessed to determine compatible future land uses. In the United States, many cleanup plans or actions are based on the Comprehensive Environmental Responsibility, Compensation, and Liability Act, which provides important but incomplete coverage of these issues, although many applications have tried to involve stakeholders at multiple steps. Where there is the potential for exposure to workers, the public, and the environment from either cleanup or leaving residual contamination in place, there is a need for a more comprehensive approach to evaluate and balance the present and future risk(s) from existing contamination, from remediation actions, as well as from postremediation residual contamination. This article focuses on the US DOE, the agency with the largest hazardous waste remediation task in the world. Presented is a framework extending from preliminary assessment, risk assessment and balancing, epidemiology, monitoring, communication, and stakeholder involvement useful for assessing risk to workers and site neighbors. Provided are examples of those who eat fish, meat, or fruit from contaminated habitats. The US DOE's contaminated sites are unique in a number of ways: (1) huge physical footprint size, (2) types of waste (mixed radiation/chemical), and (3) quantities of waste. Proposed future land uses provide goals for remediation, but since some contamination is of a type or magnitude that cannot be cleaned up with existing technology, this in turn constrains future land use options, requiring an iterative approach. The risk approaches must fit a range of future land uses and end‐states from leave‐in‐place to complete cleanup. This will include not only traditional risk methodologies, but also the assessment and surveillance necessary for stewards for long‐term monitoring of risk from historic and future exposure to maintain sustainable protectiveness. Because of the distinctiveness of DOE sites, application of the methodologies developed here to other waste site situations requires site‐specific evaluation © 2007 Wiley Periodicals, Inc.
Treatment technologies for mercury in soil, waste, and water
Authors: Otto Martha , Bajpai Sankalpa 
Published: December 2007

AbstractMercury occurs naturally in the environment and can be found in elemental (metallic), inorganic, and organic forms. Modern uses for mercury include chemical manufacturing, thermometers, and lighting (mercury vapor and fluorescent lamps). The chemical and allied products industry group is responsible for the largest quantity of mercury used in the United States. Mercury, particularly the organic methylmercury form, is a potent neurotoxin capable of impairing neurological development in fetuses and young children and of damaging the central nervous system of adults. Mercury regulations span multiple federal and state environmental statutes, as well as multiple agency jurisdictions. In August 2007, the U.S. Environmental Protection Agency's (US EPA's) Office of Superfund Remediation and Technology Innovation (OSRTI) published a report titled “Treatment Technologies for Mercury in Soil, Waste, and Water.“ The report identifies eight treatment technologies and 57 projects, 50 of which provide performance data. This information can help managers at sites with mercury‐contaminated media and generators of mercury‐contaminated waste and wastewater to identify proven and effective mercury treatment technologies; screen technologies based on application‐specific goals, characteristics, and costs; and apply experiences from sites with similar treatment challenges. This article provides a synopsis of the US EPA report, which is available at http://clu‐in.org/542R07003. © 2007 Wiley Periodicals, Inc.*This article is a U.S. Government work and, as such, is in the public domain of the United States of America.