bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and evaluation of a −117 dBc/Hz phase noise voltage‐controlled oscillator using on‐chip CPW resonator for 5 GHz‐band WLAN
Authors: Pokharel Ramesh K. , Kanaya Haruichi , Yoshida Keiji 
Published: January 2010

AbstractA 5 GHz‐band voltage‐controlled oscillator employing on‐chip coplanar‐waveguide resonator instead of inductor–capacitor–resonator is proposed, designed, and fabricated in 0.18 μm CMOS technology.The advantages of the proposed VCO are the wider frequency‐tuning range; smaller chip area and phase noise is to be −117 dBc/Hz (@1 MHz offset frequency), which is comparable to that of a conventional LC–VCO. © 2010 American Association of Anatomists Microwave Opt Technol Lett 52: 763–766, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24993
Switching‐capacitor current‐reused VCO with symmetrical differential outputs
Authors: Wang Ruey‐Lue , Lin Min‐Chuan , Tzeng Yu‐Jo , Yang Cheng‐Fu , Lin Yi‐Shu 
Published: January 2010

AbstractIn this article, we present two switching‐capacitor current‐reused voltage‐controlled oscillators with two sub‐bands or four sub‐bands. The degeneration source resistors are used to improve magnitude symmetry of output signals. Tuning frequency range is from 2.16 to 2.74GHz. The phase noise is better than −104 dBc/Hz at 100 kHz frequency offset. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 600–604, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24994
Scaleable comprehensive low‐noise PHEMT model that predicts IP3 and noise
Authors: Wei Ce‐Jun , Zhu Yu , Klimashov Oleksiy , Li Binhui , Cebi Haki , Zhang Cindy , Tkachenko Yevgeniy , Bartle Dylan 
Published: January 2010

AbstractCorrelation of IP3 in a phemt with the third derivative of Ids wrt Vgs, or Gm3 is addressed.A nonlinear large‐signal Phemt model was developed based on the fitting RF Gm characteristics as well as IV/CV. Systematic extraction approach is described. In extraction, RF Gm fitting minimizes the errors between modelled and measured Gm3. Scale‐ability in terms of DC, S‐parameters, and IP3 is demonstrated. For large‐size devices, other factors, such as RF‐Gds characteristics, are also important. Modelling of accurate noise response is realized with linear lookup table data based noise model and nonlinear voltage/current sampler. The over‐all model includes also physics‐based dynamic thermal effect and scaleable measurement‐based noise model that makes it the most comprehensive and most practical in industry. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 604–611, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24995
A novel dual‐band balun using branch‐lines with open stubs
Authors: Yoon Yang Seung , Sik Cho Choon , Lee Jae W. , Kim Jaeheung 
Published: January 2010

AbstractThis letter presents a novel dual‐band balun using the branch‐line configuration. We establish design equations for dual‐band balun based on the even‐odd mode method. The proposed circuit operates at 2.45 GHz and 5.25 GHz. The single‐ended power is divided differentially at the balanced ports. The insertion losses (S21 and S31) show around −2.7 dB to −4.3 dB at the two different frequencies. The phase difference between the balanced ports shows maximum 3° deviation from 180°. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 642–644, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24996
Reconfigurable defected ground structure cell using PIN diodes on Coplanar Waveguide technology
Authors: El‐Shaarawy Heba B. , Coccetti Fabio , Plana Robert , El‐Said Mostafa , Hashish Essam A. 
Published: January 2010

AbstractThis article addresses a novel reconfigurable defected ground structure resonator fabricated on Coplanar Waveguide (CPW) technology. The resonator is endowed with an original design that enables the generation of multiple transmission zeros at arbitrary frequencies. The chosen design is indeed based on a slot defect created on the lateral ground planes of the CPW with the double advantage to allow a simple reconfiguration, by means of surface mounted (or fabricated) components, and a compact solution, by exploiting the transversal dimension of the CPW. Three different states of the diodes configuration are investigated, where in each state multiple transmission zeros are produced in the frequency range from 1 GHz to 11 GHz. Slotline design equations are used to identify the resonant frequencies of the transmission zeros and validated using the magnetic field distribution inside the slot. In this work, the reconfigurability is first proven by means of open and short circuits in specific locations and then replaced by PIN diodes. Simulated and measured results are in good agreement. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 766–770, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25003
Hot‐carrier reliability monitoring of DMG ISE SON MOSFET for improved analog performance
Authors: Kaur Ravneet , Chaujar Rishu , Saxena Manoj , Gupta R. S. 
Published: January 2010

AbstractThe hot‐carrier reliability, analog, and linearity characteristics of DMG ISE SON MOSFET have been discussed.The device reduces electron temperature by 35.85% in comparison to a non‐dual material gate (DMG) architecture showing its self‐heating resistant nature. The analog performance and linearity metrics—gm/IDS, Rout, VEA, and gm/gd and VIP2 and VIP3—have been studied facilitating the selection of bias point for improved RF/analog performance. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 770–775, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25004
A new K‐band push‐push VCO using a miniaturized hairpin resonator
Authors: Lee Hyun‐Wook , Yoon Ki‐Cheol , Nam Hee , Eo Yun‐Seong , Lee Jong‐Chul 
Published: January 2010

AbstractIn this article, a K‐band push‐push Voltage Controlled Oscillator (VCO) is presented using a miniaturized hairpin resonator (MHR) with a higher loaded quality factor and the reduced circuit area within 50% compared to the conventional one at 9.2 GHz.The MHR combined with the GaAs MESFET varactor shows a tuning range of 140 MHz, and this voltage tunable MHR is used to compose a push‐push VCO. It provides the frequency tuning range of 71 MHz with flatness of +0.13 dB, which is increased by 31 MHz compared to the conventional VCO. The voltage controlled push‐push oscillator based on the series feedback topology is implemented on 0.54 mm‐thick Teflon substrate with a dielectric constant of 2.54. The measurement shows the output power of 1.18 dBm, the fundamental signal power suppression of −33 dBc, and phase noise performance of −86.78 dBc/Hz at 100 kHz offset. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 699–701, 2010; Published online in Wiley InterScience (www.interscience. wiley.com). DOI 10.1002/mop.25007
Automated design of microwave discrete tuning differential capacitance circuits in Si‐integrated technologies
Authors: Mendes Luís , Pires E.J. Solteiro , Vaz João C. , Rosário Maria J. , de Moura Oliveira P. B. , Machado J. A. Tenreiro 
Published: January 2010

AbstractA genetic algorithm used to design radio‐frequency binary‐weighted differential switched capacitor arrays (RFDSCAs) is presented in this article. The algorithm provides a set of circuits all having the same maximum performance. This article also describes the design, implementation, and measurements results of a 0.25 μm BiCMOS 3‐bit RFDSCA. The experimental results show that the circuit presents the expected performance up to 40 GHz. The similarity between the evolutionary solutions, circuit simulations, and measured results indicates that the genetic synthesis method is a very useful tool for designing optimum performance RFDSCAs. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 629–634, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25009
W‐band compact bandpass filters on thin‐film substrate
Authors: Yoo Chan‐Sei , Maeng Ji‐Min , Cheon Nam‐Cheol , Song Sangsub , Seo Kwang‐Seok 
Published: January 2010

AbstractIn this article, the miniaturized resonator and bandpass filter for W‐band application are suggested and evaluated on thin‐film substrate.In the meanwhile, the resonator using the loading capacitor with the electrical length of 2λg/9 and the other resonator using broadside coupled line structure of λg/9 are designed and applied for the compact filter evaluation. The filter using the capacitor‐loaded resonators with the dimension of 0.2 × 0.5 mm2shows the insertion loss of 2.1 dB at 94 GHz, and the return loss better than 10 dB at the frequencies between 91 and 98 GHz. For the filter using broadside coupled line resonators with the size of 0.33 × 0.24 mm2, the insertion loss is 2.3 dB at 92 GHz and the return loss is better than 10 dB in at the frequencies between 85 and 99 GHz. These filters show very compact dimensions retaining the filter performance commensurate with those of the filters in previous works. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 750–753, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25011
Particle swarm optimization of L‐probe fed E‐shaped patch antenna using single‐objective function
Authors: Chung Kwok L. , Tam W. Y. 
Published: January 2010

AbstractAn application of particle swarm optimization (PSO) for wideband patch antenna design is presented in this article. A PSO kernel is built on a MATLAB‐driven MoM‐based EM simulator FEKO. The chosen antenna geometry in this study is the E‐shaped patch but excited by an L‐probe feed. Ten geometrical parameters are optimized simultaneously with the use of a single‐objective: impedance bandwidth broadening. The desired center frequency of this ceiling mounted WLAN (IEEE 802.11a/n) antenna is set at 5.5 GHz with butterfly beam operation. E‐shaped patch geometry of higher order mode is obtained from the PSO‐EM optimizer. The simulated results are verified by the experimental results that a ∼3.5 dBi gain at the elevation angles of ±36° and a >50% of 10‐dB return‐loss bandwidth are obtained at the price of high cross‐polarization levels. This suggests that a multiobjective particle swarm optimization should be used for the wideband antenna design in the future study. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 702–706, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25016
High‐performance integrated passive technology by advanced SI‐GaAs‐based fabrication for RF and microwave applications
Authors: Wang Cong , Lee Ji‐Hoon , Kim Nam‐Young 
Published: January 2010

AbstractIn this letter, an advanced SI‐GaAs‐based manufacturing process is presented for creating high quality, cost effective, and compact size integrated passive devices. Through this advanced process, accurate thin film resistors, high Q spiral inductors, and high yield/breakdown voltage metal‐insulator‐metal capacitors can be successfully realized. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 618–623, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25018
Modeling and simulation of a powerful terahertz generator based on Cherenkov superradiance
Authors: Zhang Hai , Wang Jianguo , Tian Chunming 
Published: January 2010

AbstractIn this article, the preliminary studies of coherent stimulated terahertz radiation from intense, subnanosecond electron beam are presented. The mechanism of terahertz pulse generation is associated with self‐bunching of the beam and slippage of the wave over the whole electron flow. This so‐called Cherenkov superradiance (SR) was used to propose a compact terahertz generator with high peak power. A large cross section (overmoded), slow wave structure was designed to support the high power handling capability, and the mode competition was avoided by operating the device in the surface wave status. With 2.5D particle‐in‐cell simulation, we investigated the “hot” characteristics of the proposed superradiant terahertz generator and found that the SR peak power could be further increased by optimizing the amplitude profile of electron pulse. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 657–662, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25019
High resolution‐HMBC (HR‐HMBC), a new method for measuring heteronuclear long‐range coupling constants
Authors: Furihata Kazuo , Tashiro Mitsuru , Seto Haruo 
Published: January 2010

AbstractA useful pulse sequence for measuring long‐range CH coupling constants (JCH) named high resolution‐HMBC (HR‐HMBC) has been developed. In this pulse sequence, the J‐scaling pulse [(nt1)/2180° (H/C) − (nt1)/2] is incorporated after the spin evolution period, and then followed by an 1H 180° pulse to reverse the magnetization of JCH couplings. As a result, splittings of the cross peaks due to the long‐range JCH are realigned with separations of nJCH along the F1 dimension, and thus even the small long‐range JCH values can easily be determined. The efficiency of measuring the long‐range JCH using the proposed pulse sequences has been demonstrated in application to the complicated natural product, portmicin. Copyright © 2010 John Wiley & Sons, Ltd.
Preparation of monodisperse poly(St‐co‐PETEA) microspheres by precipitation polymerization using ethanol as solvent
Authors: Jiang Hongyan , Chen Hou , Liang Ying , Liu Xin 
Published: January 2010

AbstractPrecipitation polymerization of styrene (St) was carried out with pentaerythritol tetraacrylate (PETEA) to produce monodisperse crosslinked microspheres. A much safer ethanol replaced acetonitrile as a solvent in precipitation polymerization of monodisperse crosslinked poly(St‐co‐PETEA) microspheres. Monodisperse crosslinked microspheres with high monomer conversion were achieved within 4 hr. Uniform and well‐separated monodisperse were obtained in ethanol when PETEA concentration varied from 30 vol% to 90 vol% and the particle diameter decreased from 0.75 to 0.58 µm. The particle yield increased from 36.51 to 64.38% by increase in the initiator loading from 1 to 8 wt%. No coagulum occurred between particles when the polymerization time varied from 2 to 10 hr. Copyright © 2010 John Wiley & Sons, Ltd.
Somatic mutations and losses of expression of microRNA regulation‐related genes AGO2 and TNRC6A in gastric and colorectal cancers
Authors: Kim Min S , Oh Ji E , Kim Yoo R , Park Sang W , Kang Mi R , Kim Sung S , Ahn Chang H , Yoo Nam J , Lee Sug H 
Published: January 2010

AbstractMounting evidence indicates that deregulation of microRNAs (miRNAs) are involved in development of many human diseases, including cancers. Regulation of miRNA is a complicated process and some components in the regulation are known to be altered in human cancers. Among the miRNA regulation‐related genes, we found that AGO1, AGO2, TNRC6A, TNRC6C, TARBP2 and EXPORTIN5 genes have mononucleotide repeats in their coding sequences. To see whether these genes are mutated in cancers with microsatellite instability (MSI), we analysed the mononucleotide repeats in 27 gastric cancers (GCs) with high MSI (MSI‐H), 18 GC with low MSI (MSI‐L), 45 GC with stable MSI (MSS), 41 colorectal cancers (CRCs) with MSI‐H, 14 CRCs with MSI‐L and 45 CRCs with stable MSI (MSS) by single‐strand conformation polymorphism (SSCP) analysis and DNA sequencing. We found AGO2, TNRC6A, TARBP2, TNRC6C and EXPORTIN5 mutations in 10, six, one, one and one cancer(s), respectively. They were detected in MSI‐H but not in MSI‐L or MSS cancers. The GCs and CRCs with MSI‐H harboured one or more mutations of the genes in 22% and 27%, respectively. We also analysed Ago2 and TNRC6A protein expressions in GCs and CRCs with MSI‐H. In cancers with MSI‐H, loss of Ago2 expression was observed in 40% of GCs and 35% of CRCs, while loss of TNRC6A was observed in 52% of the GCs and 54% of the CRCs. Our data indicate that frameshift mutations in AGO2 and TNRC6A and their losses of expression are common in GCs and CRCs with MSI‐H, and suggest that these alterations may contribute to the cancer development by deregulating miRNA regulation. Copyright © 2010 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
Maternal plasma levels of follistatin‐related gene protein in the first trimester of pregnancies with Down syndrome
Authors: Miron Pierre , Lambert Jean , Marcil Anne , Cowans Nicholas J. , Stamatopoulou Anastasia , Spencer Kevin 
Published: January 2010

AbstractObjectiveTo determine maternal plasma levels of follistatin‐related gene protein (FLRG) in the first trimester of pregnancy and assess its potential role as a marker for prenatal screening of Down syndrome.MethodsMaternal plasma levels of FLRG were determined in 100 pregnant women with normal fetuses in their first trimester of pregnancy (i.e. 11th to 15th weeks). These results were compared with 20 cases with Down syndrome fetuses, taking into consideration clinical and demographic variables, such as maternal age, maternal weight, gestational age, smoking status and ethnicity.ResultsMaternal plasma median of FLRG in the normal population was 1.41 ng/mL with 95% confidence interval (CI) of 1.37–1.70 and interquartile range (IQR) of 0.88, during the 11th to 15th weeks of pregnancy. Maternal age and weight were the only variables significantly related to FLRG levels (p = 0.030 and 0.020, respectively). Only maternal and gestational ages were related to Down syndrome (p = 0.039 and 0.006, respectively). Maternal plasma levels of FLRG were not significantly different in the presence of Down syndrome fetuses compared to normal population (p = 0.63).ConclusionFLRG can be successfully detected in maternal plasma in the first trimester of pregnancy. However, its levels are not significantly altered in the presence of Down syndrome fetuses. Copyright © 2010 John Wiley & Sons, Ltd.
Identification of circulating placental mRNA in maternal blood of pregnancies affected with fetal congenital heart diseases at the second trimester of pregnancy: implications for early molecular screening
Authors: Arcelli Diego , Farina Antonio , Cappuzzello Claudia , Bresin Antonella , De Sanctis Paola , Perolo Antonella , Prandstraller Daniela , Valentini Davide , Zucchini Cinzia , Priori Silvia , Rizzo Nicola 
Published: January 2010

AbstractObjectiveTo investigate whether a significantly aberrant expression of circulating placental mRNA genes related with cardiogenesis can be detected at the second trimester of pregnancy.MethodsThe study was performed in two stages. First stage (development model group): match of 14 placental tissues at delivery of fetuses with congenital heart disease versus 20 controls. Second stage (validation model group): mRNA amplification of abnormal expressed genes in maternal blood samples from 26 women bearing a fetus with a congenital heart disease matched with 28 controls.ResultsWe identified four functional categories of genes possibly involved in abnormal heart development: cardiac morphogenesis: tenascin, thioredoxin, salvador homolog 1 protein; extracellular matrix (ECM) and valvular tissue biosynthesis; placental‐associated plasma protein, collagen, type I, alpha 2, fibulin‐1, heparanase, procollagen‐proline, 2‐oxoglutarate 4‐dioxygenase, alpha polypeptide II, Jumonji, AT rich interactive domain 1B RBP2‐like; normal contractile activity: actinin, alpha 4, fascin homolog 1, actin‐bundling protein; and congestive heart failure.ConclusionAltered placental genetic expression was found at term delivery in affected fetuses. The aberration was also confirmed in maternal blood at the second trimester of women bearing a fetus with congenital heart disease. Sensitivity for the most aberrant genes ranged between 42% and 95% at a false positive rate (FPR) of 10%. Copyright © 2010 John Wiley & Sons, Ltd.
Difference in nuchal translucency between monozygotic and dizygotic spontaneously conceived twins
Authors: Cheng Po‐Jen , Huang Shang‐Yu , Shaw Sheng‐Wen , Hsiao Ching‐Hwa , Kao Chuan‐Chi , Chueh Ho‐Yen , Hsieh T'sang‐T'ang 
Published: January 2010

AbstractObjectiveTo assess nuchal translucency (NT) thickness and differences in inter‐twin NT thickness among naturally conceived monozygotic and dizygotic twins.MethodsEnrolled women prospectively underwent NT measurement for both twins between 11 and 14 weeks of gestational age. NT thickness and inter‐twin NT difference were recorded and compared among dizygotic twins, monozygotic dichorionic twins, and monozygotic monochorionic twins.ResultsThis study obtained analyzable data for 174 monozygotic twins and 107 dizygotic twins. Of the 174 monozygotic twins, 105 were monochorionic, and 69 were dichorionic. Monozygotic monochorionic twin pregnancies had a significantly higher mean fetal NT thickness (1.48 ± 0.62 mm) than either dizygotic twin pregnancies (1.34 ± 0.50 mm) or monozygotic dichorionic twin pregnancies (1.31 ± 0.48 mm). Mean inter‐twin NT difference was significantly lower in monozygotic dichorionic twin pregnancies (0.37 ± 0.19 mm) than in dizygotic twin pregnancies (0.57 ± 0.22 mm) or monochorionic twin pregnancies (0.65 ± 0.43 mm).Irrespective of twin zygosity, NT thickness and inter‐twin NT difference were larger in monochorionic twins than in dichorionic twins (1.48 ± 0.62 mm versus 1.33 ± 0.49 mm, and 0.65 ± 0.43 mm versus 0.49 ± 0.23 mm, respectively).ConclusionDuring first‐trimester ultrasonographic screening for Down syndrome, monochorionic twin pregnancies have the greatest NT thickness and monozygotic dichorionic twin pregnancies have the lowest inter‐twin NT difference. Copyright © 2010 John Wiley & Sons, Ltd.
Chitosan, itaconic acid and poly(vinyl alcohol) hybrid polymer networks of high degree of swelling and good mechanical strength
Authors: Milosavljević Nedeljko B , Kljajević Ljiljana M , Popović Ivanka G , Filipović Jovanka M , Kalagasidis Krušić Melina T 
Published: January 2010

AbstractChitosan is a biodegradable, non‐toxic, biocompatible polymer convenient for use in drug delivery. In this study, hybrid polymeric networks (HPNs) based on chitosan, itaconic acid and poly(vinyl alcohol) (PVA) were prepared and characterized. Chitosan was dissolved in itaconic acid in order to obtain ionic crosslinking with the dicarboxylic acid. In the second step, this chitosan/itaconic acid network was mixed with PVA and chemically crosslinked with glutaraldehyde. The chitosan/itaconic acid ratio was kept constant, while the concentrations of PVA and glutaraldehyde were varied. All samples were characterized using swelling studies, dynamic mechanical analysis, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, X‐ray diffraction and scanning electron microscopy. The equilibrium degrees of swelling obtained for the HPNs were higher than most of the values reported for chitosan hydrogels obtained by dissolving chitosan in acetic acid or HCl aqueous solutions. This method of synthesis also resulted in hydrogels with better mechanical properties and thermal stability. By changing the PVA content and the degree of crosslinking, it is possible to finely tune the properties of the HPNs, which could make them suitable as potential matrices in controlled drug delivery. Copyright © 2010 Society of Chemical Industry