bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel fabrication technique of FBAR devices for mobile broadband WiMAX applications
Authors: Mai Linh , Lee Jae‐young , Pham Van‐Su , Yoon Giwan 
Published: December 2007

AbstractIn this study, we present a novel fabrication technique of FBAR devices as a feasibility study for mobile broadband WiMAX applications. This novel technique features the formation of very thin‐film Cr adhesion layers between W and SiO2 film layers in the Bragg reflectors, particularly to enhance the adhesion in‐between. As a result, the resonances were found to occur at 2.7–3.0 GHz. In addition, excellent resonance characteristics were achieved in terms of return loss and Q‐factor. This finding indicates that the proposed fabrication technique can be useful for the future mobile WiMAX applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 375–378, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23088
A small die area and wide locking range CMOS frequency divider
Authors: Jang Sheng‐Lyang , Han Jui‐Cheng , Lee Chien‐Feng , Huang J.‐F. 
Published: December 2007

AbstractThis letter proposes a new injection‐locked frequency divider (ILFD) with wide locking range and small die area. The proposed CMOS ILFD consists of an injection MOS and an LC tank voltage‐controlled oscillator with a cross‐coupled switching pair and tunable active inductors. The divide‐by‐2 ILFD was fabricated in the 0.18‐μm 1P6M CMOS technology. At the supply voltage of 1.8 V, the divider free‐running frequency is tunable from 1.46 to 2.7 GHz, and at the incident power of −4 dBm the locking range is about 3.4 GHz (79%), from the incident frequency of 2.6 to 6.0 GHz. The core power consumption is 7.2 mW and the die area is 0.383 × 0.379 mm2. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 541–544, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23090
Comparison of microwave and electrical properties of selected conducting polymers
Authors: Lakshmi K. , John Honey , Joseph Rani , George K.E. , Mathew K.T. 
Published: December 2007

AbstractMicrowave properties of conductive polymers is crucial because of their wide areas of applications such as coating in reflector antennas, coating in electronic equipments, frequency selective surfaces, EMI materials, satellite communication links, microchip antennas, and medical applications. This work involves a comparative study of dielectric properties of selected conducting polymers such as polyaniline, poly(3,4‐ethylenedioxythiophene), polythiophene, polypyrrole, and polyparaphenylene diazomethine (PPDA) in microwave and DC fields. The microwave properties such as dielectric constant, dielectric loss, absorption coefficient, heating coefficient, skin depth, and conductivity in the microwave frequency (S band), and DC fields were compared. PEDOT and polyaniline were found to exhibit excellent properties in DC field and microwave frequencies, which make them potential materials in many of the aforementioned applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 504–508, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23091
Design of a compact dual‐band bandpass filter with LTCC technology
Authors: Tang Ching‐Wen , Hsu Huan‐Chang , Liu I‐Chung 
Published: December 2007

AbstractA novel dual‐band bandpass filter is proposed in this article. Multiple stepped impedance resonators are shunt‐connected with the transmission line section to realize the dual‐band filter. Therefore, a transmission zero, which will increase isolation, can be easily generated in the middle of two passbands. Theoretical analysis and design procedures are also described in this article. Moreover, measured results of the fabricated filter match well with the outcome of theoretical prediction, indicating the feasibility of the proposed configuration. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 462–465, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23093
Asymmetric long and thick dipoles for in‐flight telemetry of projectiles
Authors: Bernard L. 
Published: December 2007

AbstractLong and thick dipoles are presented, with a feeding point located off the centre. Parameter studies are performed, showing that asymmetric radiation patterns with a main lobe in a preferred direction can be achieved. Experimental results confirm the feasibility of these antennas and illustrate possible applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 508–511, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23105
Measurements of UWB through‐the‐wall propagation using spectrum analyzer and the Hilbert transform
Authors: Hussein Muqaibel Ali 
Published: December 2007

AbstractThis article presents a simplified approach for characterization of ultra wideband (UWB) through‐the‐wall propagation. The simplified approach requires spectrum analyzer rather than vector network analyzer. A minimum phase retrieval method based on Hilbert transform is used to retrieve the phase information. The proposed method is shown to be applicable to the insertion transfer function. While linear phase component cannot be retrieved, important factors for UWB receiver design such as group delay ripple and dispersion effect can be retrieved. In noisy channels, phase retrieval could be superior to direct phase measurements. Estimation of linear phase component can be achieved through matching the measured phase with the retrieved phase. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 465–470, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23107
Empirical propagation model for WiMAX at 3.5 GHz in an urban environment
Authors: Valcarce Rial Álvaro , Krauss Harald , Hauck Joachim , Buchholz Martin , Aguado Agelet Fernando 
Published: December 2007

AbstractMany Worldwide interoperability for microwave access (WiMAX) field trials are currently taken place around the world. In some countries, commercial WiMAX networks are running. This article presents an empirical propagation model obtained from a pilot project in Saarbruecken. Results of the extensive measurement campaign of this WiMAX trial in an urban environment, operating at a frequency of 3.5 GHz, are presented and compared to own field strength predictions. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 483–487, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23112
Retro‐directive array using two‐port dual polarized elements
Authors: Chang The Nan , Wu Jut‐Shuan 
Published: December 2007

AbstractIn this article, linear and circular polarized retro‐directive arrays with two‐port dual‐polarized elements are implemented. Pair of elements is arranged so that each vertical port is connected to the horizontal port and vice versa. In this way, reflection field from the ground plane and the reradiated field by way of interconnection can easily be distinguished not only for the linear polarized array but also for the circular polarized array. Simulations and experiments were conducted at 5 and 10 GHz for 2D linear and circular polarized array. respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 450–453, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23113
Polyaniline as an automatic beam steering material
Authors: Menon Rajesh , Thomas Rinku M , John Honey , Joseph Rani , Mathew K. T. 
Published: December 2007

AbstractThis study deals with a preliminary study of automatic beam steering property in conducting polyaniline. Polyaniline in its undoped and doped state was prepared from aniline by the chemical oxidative polymerization method. Dielectric properties of the samples were studied at S‐band microwave frequencies using cavity perturbation technique. It is found that undoped polyaniline is having greater dielectric loss and conductivity compared with the doped samples. The beam steering property is studied using a perspex rod antenna and HP 8510C vector network analyzer. The shift in the radiated beam is studied for different d.c voltages. The results show that polyaniline is a good material for beam steering applications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 422–425, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23115
An influence of current leakage on characteristics of quantum well laser
Authors: Matavulj P. S. , Timotijević B. Dj. 
Published: December 2007

AbstractSignificant changes in quantum well laser performances when current leakage is not neglected are reported. Leakage effect is included extending three‐level rate equations. Derived SPICE model is used to optimize and improve the most important parameters of single quantum well lasers: threshold current, cutoff frequency, and turn‐on delay time. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 479–483, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23121
Printed UWB pellet‐shape microstrip‐fed monopolar antenna for 3.1 to 17 GHz
Authors: Chan C. H. , Lee T. K. , Chan W. S. 
Published: December 2007

AbstractA printed pellet‐shape microstrip‐fed monopolar antenna is proposed for portable UWB devices. An impedance bandwidth of 138.3% within the frequency range of 3.1 –17 GHz for S11 < −10 dB is achieved. Positive gain and constant group delay are obtained with omnidirectional radiation pattern. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 490–494, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23128
A new analytical method to extract the small‐signal equivalent circuit of high frequency FET transistors
Authors: Olvera Cervantes J. L. , Medina Monroy J. L. , Chávez Pérez R. A. , Velázquez Ventura A. 
Published: December 2007

AbstractA new set of simply analytical equations is proposed as an alternative method to calculate the intrinsic transistor elements of an extended model for microwave FET's. This method is based on Y‐parameters as well as on a new process to determine the differential resistances Rfsand Rfd, including the frequency effect, in such way that measurements at very low frequencies are not required and long iterative methods are avoided. The method was applied to FET's transistors and the validity of the model is certified by direct comparison with measured data from 1 to 45 GHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 453–457, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23130
Modified slot bow‐tie antenna for UWB applications
Authors: Mehdipour Aidin , Mohammadpour‐Aghdam Karim , Faraji‐Dana Reza , Sebak Abdel‐Razik 
Published: December 2007

AbstractA modified slot Bow‐Tie antenna is presented in this article. The presented modified antenna shows improvement in the VSWR previous reported results. Moreover, the dispersion characteristics of the antenna both in frequency and time domains have been analyzed and illustrated as well. The satisfactory agreement between experimental and simulation results proves the applicability of the antenna in UWB communications. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 429–432, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23131
Characteristic impedance of a novel TEM cell used for microwave chemistry experiment
Authors: Yang Yang , Huang Kama 
Published: December 2007

AbstractNew experimental devices with uniform electromagnetic field distribution are needed in the kinetic studies of microwave chemistry. Here a novel transverse electromagnetic (TEM) cell is proposed. The shape of the TEM cell is different from the conventional TEM cells, and it has a higher cutoff frequency of the first TE‐mode than the conventional one with the same outer dimension and a larger area of uniform electromagnetic fields than the conventional one with the same cutoff frequency. The conformal mapping method was used to calculate the characteristic impedance of the TEM cell. The finite element method was used to confirm the analytical solutions. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 525–529, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23135
Complete 1H and 13C NMR assignments and Z/E‐stereoconfiguration determination of isomers of 1,4‐diketone derivatives
Authors: Xu Guohua , Yin Guodong , Guo Wenbo , Wu Anxin , Cui Yanfang 
Published: December 2007

AbstractComplete 1H and 13C NMR assignments and Z/E‐stereoconfiguration determination for a series of new isomers of 1,4‐diketone derivatives obtained via self‐sorting tandem reaction were accomplished by means of one‐ and two‐dimentional NMR experiments including 1H, 13C, gCOSY, gHSQC, gHMBC, and NOESY. Copyright © 2008 John Wiley & Sons, Ltd.
Neutral zinc(II)O,O‐di‐alkyldithiopho‐ sphates—variable temperature31P NMR and quantum chemical study of the ZDDP monomer–dimer equilibrium
Authors: Harrison J. J. , Chan C. Y. , Onopchenko A. , Pradhan A. R. , Petersen M. 
Published: December 2007

AbstractA full line‐shape analysis of the VT31P NMR spectra was carried out for the monomer–dimer equilibrium of neutral ZDDP. The energy surface and the energetics of the monomer‐dimer equilibrium (ΔH° , ΔG° ,Ea, ΔH≠, and ΔG≠) are reported for three variants wherein the alkyl groups in the ZDDP are 2‐ethylhexyl, isopropyl, and isobutyl.We explored a reaction pathway between the monomer and dimer form by means of density functional theory (DFT). The linear combination of atomic orbitals (LCAO) code DMol3was used together with a synchronous transient method to effectively locate transition states. Vibrational eigenmodes of all intermediates were computed to capture finite temperature effects. Methyl and ethyl were considered as alkyl groups. Two novel intermediates were located—a four‐membered ring and a six‐membered ring intermediate along the reaction coordinate. Comparison of the experimentally derived and computed energy surfaces was carried out. Copyright © 2007 John Wiley & Sons, Ltd.
Active runout cancellation for fine‐seeking control in optical disk drives
Authors: Liu Jieng‐Jang , Yang Yee‐Pien 
Published: December 2007

AbstractThe fine‐seeking control, one of the radial positioning servo functions on the optical disk drives, seeks a limited number of tracks forward or backward. Two properties, noted as controllable seeking velocity and achievable settling, are important issues for fine‐seeking performance. Unless these performances are satisfied, the settling down track cannot be guaranteed to be the desired track; hence, additional seeking is required to come forward to the destination track. Owing to the periodic runout effects, the conventional feedback approaches are difficult to achieve stable velocity control and satisfactory settling performance for high spindle speed operation. This paper proposes the extended usage of frequency adaptive control technique (FACT) for active runout suppression on fine seeking. It is shown that the runout effects can be isolated from the servo systems as long as the FACT is applied. A mode switching control approach is then introduced to switch the adaptation between the track‐following and fine‐seeking processes. This leads to an efficient compensation for periodic runout, thereby eliminating the direction hysteresis in fine seeking. Experimental results are shown to be effective for the performance on both velocity control and settling behavior after seeking. Copyright © 2007 John Wiley & Sons, Ltd.
Identification of membrane‐associated proteins from Campylobacter jejuni strains using complementary proteomics technologies
Authors: Cordwell Stuart J. , Len Alice C. L. , Touma Rachel G. , Scott Nichollas E. , Falconer Linda , Jones David , Connolly Angela , Crossett Ben , Djordjevic Steven P. 
Published: December 2007

AbstractCampylobacter jejuni is the leading cause of food‐ and water‐borne illness world‐wide. The membrane‐associated proteome of a recent C. jejuni gastrointestinal isolate (JHH1) was generated by sodium carbonate precipitation and ultracentrifugation followed by 2‐DE and MALDI‐TOF MS as well as 2‐DLC (strong cation exchange followed by RP chromatography) of trypsin digests coupled to MS/MS (2‐DLC/MS/MS). 2‐DE/MS identified 77 proteins, 44 of which were predicted membrane proteins, while 2‐DLC/MS/MS identified 432 proteins, of which 206 were predicted to be membrane associated. A total of 453 unique proteins (27.4% of the C. jejuni theoretical proteome), including 187 bona fide membrane proteins were identified in this study. Membrane proteins were also compared between C. jejuni JHH1 and ATCC 700297 to identify factors potentially associated with increased gastrointestinal virulence. We identified 28 proteins that were significantly (>two‐fold) more abundant in, or unique to, JHH1, including eight proteins involved in chemotaxis signal transduction and flagellar motility, the amino acid‐binding surface antigens CjaA and CjaC, and four outer membrane proteins (OMPs) of unknown function (Cj0129c, Cj1031, Cj1279c, and Cj1721c). Immunoblotting using convalescent patient sera generated postgastrointestinal infection revealed 13 (JHH1) and 12 (ATCC 700297) immunoreactive proteins. These included flagellin (FlaA) and CadF as well as Omp18, Omp50, Cj1721c, PEB1A, PEB2, and PEB4A. This study provides a comprehensive analysis of membrane‐associated proteins from C. jejuni.
Proteomic profiling using mass spectrometry – does normalising by total ion current potentially mask some biological differences?
Authors: Cairns David A. , Thompson Douglas , Perkins David N. , Stanley Anthea J. , Selby Peter J. , Banks Rosamonde E. 
Published: December 2007

AbstractNormalisation of data to minimise the impact of technical variation on comparative sample analysis is often carried out. Using SELDI data as a model, we have examined the effects of normalisation by TIC which is commonly used for MS data. Significant intergroup differences in normalisation factor were found for serum profiles which could not be explained by experimental factors, implying that normalisation by TIC may in some situations also normalise biological differences and should be systematically evaluated.
Post alignment clustering procedure for comparative quantitative proteomics LC‐MS Data
Authors: de Groot Joost C. W. , Fiers Mark W. E. J. , van Ham Roeland C. H. J. , America Antoine H. P. 
Published: December 2007

AbstractComparative LC‐MS is a powerful method for detailed quantitative comparison of complex protein mixtures. Dedicated software is required for detection, matching, and alignment of peaks in multiple LC‐MS datasets. However, retention time shifts, saturation effects, limitations of experimental accuracy, and possible occurrence of split peaks make it difficult for software to perfectly match all chromatograms. We describe a procedure to assess the above problems and show that dataset quality can be enhanced with the aid of cluster analysis.
Protein Information Crawler (PIC): Extensive spidering of multiple protein information resources for large protein sets
Authors: Mayer Ulrich 
Published: December 2007

AbstractProteomic studies often produce sets of hundreds of proteins. Bioinformatic information for these large protein sets must be collected from multiple online resources. Protein Information Crawler (PIC) automatically bulk‐collects such data from multiple databases and prediction servers, based on National Center for Biotechnology Information (NCBI) gi numbers or accession numbers, and summarizes them in a Microsoft Excel® spreadsheet and/or HTML table. PIC greatly accelerates information procurement, helps to build customized protein information databases and drastically reduces manual database investigation in extensive proteomic studies. Availability: http://www.zoo.uni‐heidelberg.de/mfa/PIC.
Vesicular and tubular structures prepared from self‐assembly of novel amphiphilic ABA triblock copolymers in aqueous solutions
Authors: Tian Zhen , Li Haibin , Wang Meng , Zhang Aiying , Feng Zeng‐Guo 
Published: December 2007

AbstractA kind of novel soft amphiphilic ABA triblock copolymers, poly(L‐lysine)‐b‐poly(tetrahydrofuran)‐b‐poly(L‐lysine), was synthesized by the anionic ring‐opening polymerization of ε‐benzyloxycarbonyl‐L‐lysine N‐carboxyanhydride using amine‐terminated poly(tetrahydrofuran) as a macroinitiator and subsequent removal of the protecting group. The resulting copolymers possessing a nearly symmetrical and narrow molecular weight distribution were dissolved in water at an appropriate concentration range at room temperature to yield vesicles as confirmed by using negative stain TEM and DLS. Meanwhile, nanotubes were obtained as the result of the conjunction of vesicles by reducing the medium temperature as evidenced by TEM. The effect of pH and salt concentration variations on the self‐assembly behavior was also examined. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 1042–1050, 2008
Rheological and thermal properties of agarose aqueous solutions and hydrogels
Authors: Fernández Emiliano , López Daniel , Mijangos Carmen , Duskova‐Smrckova Miroslava , Ilavsky Michal , Dusek Karel 
Published: December 2007

AbstractIn this article, we report on the rheological properties of agarose aqueous solutions and gels. Viscosity curves were determined for homogeneous agarose aqueous solutions at different temperatures (from 68 to 38 °C) to study the viscosity behavior as the systems undergo gelation. The gelation phenomenon of agarose solutions was also investigated by shear oscillation experiments and differential scanning calorimetry. The gelation and melting temperature as a function of agarose concentration were determined together with the gelation and melting enthalpies. The results obtained were interpreted using the two‐step model describing the gelation of agarose in water. © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 322–328, 2008
Correlations in single‐photon experiments
Authors: Varró S. 
Published: December 2007

AbstractCorrelations of detection events in two photodetectors placed at the opposite sides of a beam splitter are studied in the frame of classical probability theory. It is assumed that there is always only one photon present in the measuring apparatus during one elementary experiment (one measurement act). Due to the conservation of energy, there is always a strict anticorrelation in one elementary experiment, because the photon cannot excite both of the detectors at the same time. It is explicitely shown in several examples that the “bunching” and “anti‐bunching” of the counts in serieses of elementary single‐photon experiments is governed by the statistical properties of grouping the sequences of the elementary measurements.
On the dynamic deformation of porous Cosserat linear–thermoelastic shells
Authors: Bîrsan M. 
Published: December 2007

AbstractThis paper is concerned with the linear theory of porous Cosserat thermoelastic shells. We consider anisotropic and inhomogeneous shells and establish the existence and uniqueness of solution to the boundary–initial–value problem associated to the dynamic deformations. To this aim, we employ the semigroup of linear operators theory.