bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multisection bandpass filters using capacitively loaded transmission lines
Authors: Li Zhen , Palmer William D. , Joines William T. 
Published: February 2009

AbstractIn the frequency range from 50 to 500 MHz, lumped element inductors may have internal resonances, and the distributed nature of the physical structure is solved using transmission‐line theory. Stub filters (shorted or opened stubs separated by sections of line) are quite reliable and easy to manufacture, but their physical size is a disadvantage at these frequencies. In this article, the size reduction process is illustrated by a series of design examples, starting with a bandpass filter at 200 MHz that uses half‐wavelength tapped‐stubs and has multiple resonant sections separated by quarter‐wavelength sections of transmission line. By using this technique the filter area is reduced from 243.67 square inches to 5.99 square inches, an impressive factor of about 40×! Theoretical results are verified by measurements. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1107–1112, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24252
Shifted SSOR preconditioning technique for electromagnetic wave scattering problems
Authors: Chen J. Q. , Liu Z. W. , Xu K. , Ding D. Z. , Fan Z. H. , Chen R. S. 
Published: February 2009

AbstractTo efficiently solve large dense complex linear system arising from electric field integral equations (EFIE) formulation of electromagnetic scattering problems, the multilevel fast multipole method (MLFMM) is used to accelerate the matrix‐vector product operations. The symmetric successive over‐relaxation (SSOR) preconditioner is constructed based on the near‐field matrix of the EFIE and employed to speed up the convergence rate of iterative methods. This technique can be greatly improved by shifting the near‐field matrix of the EFIE with the principle value term of the magnetic field integral equation (MFIE) operator. Numerical results demonstrate that this method can reduce both the number of iterations and the computational time significantly with low cost for construction and implementation of preconditioners. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1035–1039, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24254
Dual band‐notched ultra‐wideband antenna with codirectional SRR
Authors: Wang Wentao , Gong Shuxi , Cui Zhen , Liu Jianfu , Ling Jin 
Published: February 2009

AbstractIn this article, a rectangular monopole ultra‐wideband antenna with dual band‐notched characteristic is proposed. The bandstop characteristic is produced by a new configuration of split ring resonators (SRRs). Being different from the conventional reverse split rings, this novel structure consists of two codirectional split rings and locates in the both sides of the rectangular radiating patch. Furthermore, the length of each ring controls the corresponding resonant frequency. By adjusting the dimension of the codirectional SRRs, the band‐rejected frequencies from 3.25 to 3.75 GHz and from 5.15 to 5.6 GHz can be achieved easily. These rejected bands cover the operating bands, which have been applied to WiMAX and WLAN. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1032–1034, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24255
A novel planar multimode bandpass filter with radial perturbation
Authors: Ma Kaixue , Yeo Kiat Seng , Sun Qiang 
Published: February 2009

AbstractA novel multimode bandpass filter with good rejection band is proposed by using a radial stub. The radial stub cannot only perturb the traditional resonator for the multimode operation but also generate additional zero point at the stopband for the stopband control. With proper input/output coupling, additional two poles, that is, four poles, can be achieved for the proposed filter structure. The experimental results of the four‐mode filter show low insertion loss, good stopband performance, and compact size. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 964–966, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24258
Erratum: A graphical tool for analysis and design of bi‐characteristic‐impedance transmission lines
Authors: Torrungrueng D. , Chou P. Y. , Krairiksh M. 
Published: February 2009

AbstractOriginally published in Microwave Opt Technol Lett 49: 2368–2372, 2007. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1154, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24260
Compact low pass filter using novel elliptic shape DGS
Authors: Chen XiaoQun , Wang LingXia , Weng LiHong , Shi XiaoWei 
Published: February 2009

AbstractA novel elliptic shape defected ground structure (DGS) is investigated for low pass filter (LPF) applications. An equivalent RLC circuit model is presented and its corresponding parameters are also extracted from the measured S‐parameters. The filter presents the advantages of compact size, high selectivity, low insertion loss and high out‐band suppression more than 32 dB from 5.15 to 10 GHz. Good agreements with response of equivalent circuit, electromagnetic simulation, and measurement is demonstrated. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1088–1091, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24263
Sensitivity analysis of the effective parameter extraction procedure for metamaterial applications
Authors: Tyagi Varun , Semouchkina Elena 
Published: February 2009

AbstractWe examine the accuracy of metamaterial effective parameters extraction from the reflection and transmission data and show that this procedure could lead to significant errors in the effective permittivity and permeability values near frequencies where the reflection coefficient has low magnitudes, while the refractive index can still be accurately extracted. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1013–1017, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24267
Dispersion in one‐dimensional photonic band gap periodic transmission lines
Authors: Angert C. Isaac , Remillard S. K. 
Published: February 2009

AbstractDispersion in periodic microstrip transmission lines was investigated by using S‐parameters to calculate the characteristic impedance and the complex propagation constant. Dispersion curves determined from a variety of methods, including simulation with IE3D and measurement with a network analyzer, were compared with an analytic transcendental model providing self‐consistent validation of each method. Simulated S‐parameters agreed with measurement, including the case of a multi‐layered substrate. Very similar dispersion curves were produced using simulated S‐parameters, simulated current distributions, analytic calculation and measured S‐parameters. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1010–1013, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24268
Complement 3 deficiency impairs early pregnancy in mice
Authors: Chow Wang‐Ngai , Lee Yin‐Lau , Wong Po‐Chau , Chung Man‐Kin , Lee Kai‐Fai , Yeung William Shu‐Biu 
Published: February 2009

AbstractHuman oviductal cells produce complement‐3 (C3) and its derivative, iC3b. These molecules are important in immune responses. Our recent study suggested that iC3b also possessed embryotrophic activity and it stimulates the blastulation and hatching rates of in vitro cultured mouse embryos. The objective is to study the impact of C3 deficiency on early pregnancy in vivo using homozygous C3‐deficient (C3KO) and wild‐type (C3WT) mice. C3 protein was undetectable in the reproductive tissues of C3KO mice. Deficiency in C3 is associated with significantly longer estrous cycle (P = 0.037). No significant difference was found in the ovulation rate, total cell count in blastocysts and implantation rate between the wild‐type and the C3KO mice, though C3KO mice tended to have lower values in the latter two parameters. On day 15 of pregnancy, C3KO mice had fewer conceptus (P < 0.001) and higher resorption rate (P < 0.001) than that of C3WT mice. The fetal and placental weights (P < 0.001) were lower in the C3KO mice. The placenta of C3KO mice had smaller spongiotrophoblast (P = 0.001) and labyrinth (P = 0.037). Deficiency in C3 is associated with mild impairment in early pregnancy including longer estrous cycle and higher resorption rates after implantation. The impairment may be related to compromised placental development leading to under‐developed fetuses. Mol. Reprod. Dev. 76: 647–655, 2009. © 2009 Wiley‐Liss, Inc.
Recursive algorithms for unbalanced banded Toeplitz systems
Authors: Favati P. , Lotti G. , Menchi O. 
Published: February 2009

AbstractDirect recursive algorithms for the solution of band Toeplitz systems are considered here. They exploit the displacement rank properties, which allow a large reduction of computational efforts and storage requirements. Their use of the Sherman–Morrison–Woodbury formula turns out to be particularly suitable for the case of unbalanced bandwidths. The computational costs of the algorithms under consideration are compared both in a theoretical and practical setting. Some stability issues are discussed as well. Copyright © 2009 John Wiley & Sons, Ltd.
Randomized controlled trial of SPIRIT: An effective approach to preparing African‐American dialysis patients and families for end of life
Authors: Song Mi‐Kyung , Ward Sandra E. , Happ Mary Beth , Piraino Beth , Donovan Heidi S. , Shields Anne‐Marie , Connolly Mary C. 
Published: February 2009

AbstractThis randomized controlled trial tested an intervention, Sharing Patients' Illness Representations to Increase Trust (SPIRIT), designed to enhance communication regarding end‐of‐life care between African Americans with end‐stage renal disease (ESRD) and their chosen surrogate decision makers (N = 58 dyads). We used surveys and semi‐structured interviews to determine the feasibility, acceptability, and preliminary effects of SPIRIT on patient and surrogate outcomes at 1 week and 3 months post‐intervention. We also evaluated patients' deaths and surrogates' end‐of‐life decision making to assess surrogates' perceptions of benefits and limitations of the SPIRIT while facing end‐of‐life decisions. We found that SPIRIT promoted communication between patients and their surrogates and was effective and well received by the participants. © 2009 Wiley Periodicals, Inc. Res Nurs Health 32:260–273, 2009
Teacher expectations on the directiveness continuum in consultation
Authors: Tysinger P. Dawn , Tysinger Jeffrey A. , Diamanduros Terry 
Published: February 2009

AbstractThe study investigated the consultation approaches of collaborative‐directive and collaborative‐nondirective and the influence of teacher expectations for consultation on their ratings of consultation success. Teachers viewed videotaped consultation sessions of a collaborative‐directive or collaborative‐nondirective consultation session that either matched or mismatched their expectations. The study found significantly higher ratings for the consultants and interventions when the collaborative‐directive approach was used. In addition, teachers in conditions that matched their expectations for consultation rated consultants and interventions significantly higher than did teachers in mismatched conditions. The importance of this line of research lies in its practical application, allowing practitioners of consultation and trainers of school psychologists greater knowledge in selection of the appropriate consultation approach to maximize perceived consultant effectiveness and intervention acceptability. © 2009 Wiley Periodicals, Inc.
Methods for measuring student response to stimulant medication: A meta‐analytic review
Authors: Someki Fumio , Burns Matthew K. 
Published: February 2009

AbstractMeasuring student response to interventions has become an important role for school psychologists. Children with Attention‐Deficit/Hyperactivity Disorder (ADHD) are frequently treated with stimulant medication, but the response to the treatment is rarely adequately assessed. The current study examined the sensitivity of measures used to assess the outcomes of stimulant medication for children identified with ADHD using meta‐analytic procedures. A total of 812 articles were reviewed with 35 being selected for the study based on a common treatment protocol of .3 to .5 mg/kg with a 2‐ to 8‐week pre‐ and post‐test interval. Measures were categorized as behavioral, psychological, or physiological. A total of 81 effect sizes were computed with a total unbiased estimate of effect of .53 and unbiased estimates of effect of .11 for physiological measures, .38 for psychological measures, and .56 for behavioral measures. Tests of homogeneity found nonsignificant results within each of the three categories. © 2009 Wiley Periodicals, Inc.
Functional colloidal particles stabilized by layered silicate with hydrophilic face and hydrophobic polymer brushes
Authors: Wu Yani , Zhang Jian , Zhao Hanying 
Published: February 2009

AbstractIn this study, we describe a new strategy for producing narrowly dispersed functional colloidal particles stabilized by a nanocomposite with hydrophilic clay faces and hydrophobic polystyrene (PS) brushes on the edges. This method involves preparation of polymer brushes on the edges of clay layers and Pickering suspension polymerization of styrene in the presence of the nanocomposites. PS brushes on the edges of clay layers were prepared by atom transfer radical polymerization. X‐ray diffraction and thermogravimetric analysis results indicated that PS chains were grafted to the edges of clay platelets. Transmission electron microscope results showed that different morphologies of clay‐PS particles could be obtained in different solvents. In water, clay‐PS particles aggregated together, in which PS chains collapsed forming nanosized hydrophobic domains and hydrophilic clay faces stayed in aqueous phase. In toluene, clay‐PS particles formed face‐to‐face structure. Narrowly dispersed PS colloidal particles stabilized by clay‐PS were prepared by suspension polymerization. Because of the negatively charged clay particles on the surface, the zeta potential of the PS colloidal particles was negative. Positively charged poly(2‐vinyl pyridine) (P2VP) chains were adsorbed to the surface of PS colloidal particles in aqueous solution at a low pH value, and gold nanoparticles were prepared in P2VP brushes. Such colloidal particles may find important applications in a variety of fields including waterborne adhesives, paints, catalysis of chemical reactions, and protein separation. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1535–1543, 2009
Synthesis, photoluminescence, and electrochromism of novel aromatic poly(amine‐1,3,4‐oxadiazole)s bearing anthrylamine chromophores
Authors: Yen Hung‐Ju , Liou Guey‐Sheng 
Published: February 2009

AbstractTwo novel poly(amine‐hydrazide)s were prepared from the polycondensation reactions of the dicarboxylic acid, 9‐[N,N‐di(4‐carboxyphenyl)amino]anthracene (1), with terephthalic dihydrazide (TPH) and isophthalic dihydrazide (IPH) via the Yamazaki phosphorylation reaction, respectively. The poly(amine‐hydrazide)s were readily soluble in many common organic solvents and could be solution cast into transparent films. Differential scanning calorimetry (DSC) indicated that these hydrazide polymers had glass‐transition temperatures (Tg) in the range of 182–230 °C and could be thermally cyclodehydrated into the corresponding oxadiazole polymers in the range of 300–400 °C. The resulting poly(amine‐1,3,4‐oxadiazole)s had useful levels of thermal stability associated with high Tg (263–318 °C), 10% weight‐loss temperatures in excess of 500 °C, and char yield at 800 °C in nitrogen higher than 55%. These organo‐soluble anthrylamine‐based poly(amine‐hydrazide)s and poly (amine‐1,3,4‐oxadiazole)s exhibited maximum UV‐vis absorption at 346–349 and 379–388 nm in N‐methyl‐2‐pyrrolidone (NMP) solution, respectively. Their photoluminescence spectra in NMP solution showed maximum bands around 490–497 nm in the green region. The poly(amine‐hydrazide) I‐IPH showed a green photoluminescence at 490 nm with PL quantum yield of 29.9% and 17.0% in NMP solution and film state, respectively. The anthrylamine‐based poly(amine‐1,3,4‐oxadiazole)s revealed a electrochromic characteristics with changing color from the pale yellow neutral form to the red reduced form when scanning potentials negatively from 0.00 to −2.20 V. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1584–1594, 2009
Synthesis of dendritic terpolymers consisting of polystyrene, polybutadiene, and polyisoprene with different isomerisms
Authors: Rangou Sofia , Avgeropoulos Apostolos 
Published: February 2009

AbstractWe report the synthesis of two 2nd generation dendritic terpolymers consisting of poly(butadiene) (PB) of 1,4 geometric isomerism, poly(isoprene) (PI) enriched in 3,4 geometric isomerism (at least 55% PI3,4) and polystyrene (PS). The main focus of this work was the synthesis of well‐defined dendritic terpolymers exhibiting high levels of molecular and compositional homogeneity. The preparation of these materials was achieved via anionic polymerization techniques in combination with chlorosilane linking chemistry. The molecular characterization of the intermediate products and the final dendritic materials was accomplished via gel permeation chromatography, membrane osmometry, differential scanning calorimetry, and 1H‐nuclear magnetic resonance spectroscopy, leading to the conclusion that they can be considered model polymers. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1567–1574, 2009
Preparation and properties of conductive silver/photosensitive polyimide nanocomposites
Authors: Li Tung‐Lin , Hsu Steve Lien‐Chung 
Published: February 2009

AbstractA new electrically conductive photoresist has been developed. It is based on the dispersion of silver nanoflakes in a negative‐tone photosensitive polyimide (PSPI) precursor. 2‐Mercaptopropionic acid was used as the surfactant to modify the silver nanoflake surface for the dispersion of silver nanoflakes in the polymer. The silver/PSPI nanocomposites showed electrical conductivity at a low silver content of 10 wt %. The electrical conductivity of the silver/PSPI nanocomposites ranged from 10 to 104 S/cm, which was dependent on the silver weight fraction in the resist formulation. Patterns with a resolution of 30 μm were obtained from the silver/PSPI nanocomposites. The silver/PSPI nanocomposites had excellent thermal properties. Their glass transition temperatures were above 360 °C and thermal decomposition temperatures were over 420 °C. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 1575–1583, 2009
The effects of airway closure in central apneas and obstructed respiratory efforts in mixed apneas in preterm infants
Authors: Al‐Sufayan F. , Bamehrez M. , Kwiatkowski K. , Alvaro R.E. 
Published: February 2009

AbstractBackgroundAirway closure during central apnea could allow for better gas exchange. However, the return of inspiratory efforts against a closed airway may cause greater desaturation and prolongation of apnea.ObjectiveTo investigate the effect of patency of the airway and obstructed respiratory efforts on the length of apneas and the degree and slope of O2 desaturation and bradycardia.MethodsAll mixed apneas observed in 15 preterms were matched 1:2 with the longest central apneas in each infant. Central apneas were further classified using the amplified cardiac airflow oscillation in those with airway open and in those with airway closed.ResultsNo differences were found in the length of apnea, slope of O2 desaturation, delay between the onset of apnea and onset of desaturation, lowest post‐apneic SpO2, and time of recovery of SpO2 between central apneas with and without airway closure. Although mixed apneas were significantly longer than central apneas, their initial central component was significantly shorter than the length of central apneas. In mixed apneas, the onset of O2 desaturation occurred faster, SpO2 decreased lower, and recovered slower compared with central apneas. The slope of O2 desaturation after the obstructed respiratory efforts was significantly greater than before the obstructed respiratory efforts.ConclusionsIn preterm infants: (1) airway closure during central apneas does not limit oxygen desaturation; (2) respiratory efforts against a closed airway prolong apnea and worsen the degree of desaturation and bradycardia. Although respiratory efforts are not necessary to induce airway closure, inspiratory efforts against a closed airway could trigger inhibitory cardio‐respiratory responses causing significant desaturation, bradycardia, and prolongation of apnea. Pediatr Pulmonol. 2009; 44:253–259. © 2009 Wiley‐Liss, Inc.
MMP‐9 and TIMP‐1 in the cord blood of premature infants developing BPD
Authors: Fukunaga Shinnosuke , Ichiyama Takashi , Maeba Shinji , Okuda Masayuki , Nakata Masahiko , Sugino Norihiro , Furukawa Susumu 
Published: February 2009

AbstractWe investigated matrix metalloproteinase‐9 (MMP‐9) and tissue inhibitor of metalloproteinase 1 (TIMP‐1) levels in the cord blood of 29 premature infants who were <30 weeks gestation. One, 8, and 14 infants developed severe, moderate and mild bronchopulmonary dysplasia (BPD), respectively, and 6 did not. MMP‐9 and TIMP‐1 levels in the cord blood were determined by ELISA. MMP‐9/TIMP‐1 ratios in the cord blood of infants who developed severe or moderate BPD (n = 9) were significantly higher than those who developed mild BPD or did not develop BPD (n = 20; P = 0.015). Multivariate linear regressions demonstrated that MMP‐9 levels and MMP‐9/TIMP‐1 ratios in the cord blood of the premature infants correlated with the oxygen supplementation period (r = 0.58, P = 0.003 and r = 0.41, P = 0.030, respectively). The MMP‐9 levels and MMP‐9/TIMP‐1 ratios correlated with the severity of maternal chorioamnionitis (both trend P = 0.006).The MMP‐9 levels and MMP‐9/TIMP‐1 ratios in the cord blood may be related to the pathogenesis and severity of BPD and maternal chorioamnionitis. Pediatr Pulmonol. 2009; 44:267–272. © 2009 Wiley‐Liss, Inc.
Exploiting genomic patterns to discover new supramolecular protein assemblies
Authors: Beeby Morgan , Bobik Thomas A. , Yeates Todd O. 
Published: February 2009

AbstractBacterial microcompartments are supramolecular protein assemblies that function as bacterial organelles by compartmentalizing particular enzymes and metabolic intermediates. The outer shells of these microcompartments are assembled from multiple paralogous structural proteins. Because the paralogs are required to assemble together, their genes are often transcribed together from the same operon, giving rise to a distinctive genomic pattern: multiple, typically small, paralogous proteins encoded in close proximity on the bacterial chromosome. To investigate the generality of this pattern in supramolecular assemblies, we employed a comparative genomics approach to search for protein families that show the same kind of genomic pattern as that exhibited by bacterial microcompartments. The results indicate that a variety of large supramolecular assemblies fit the pattern, including bacterial gas vesicles, bacterial pili, and small heat‐shock protein complexes. The search also retrieved several widely distributed protein families of presently unknown function. The proteins from one of these families were characterized experimentally and found to show a behavior indicative of supramolecular assembly. We conclude that cotranscribed paralogs are a common feature of diverse supramolecular assemblies, and a useful genomic signature for discovering new kinds of large protein assemblies from genomic data.