bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tunable Band‐Pass Filters Based on Varactor‐Loaded Complementary Split‐Ring Resonators on Half‐Mode Substrate Integrated Waveguide
Authors: Sam Somarith , Lim Sungjoon 
Published: July 2013

ABSTRACTMiniaturized band‐pass filters (BPFs) using backward wave propagation in the left‐handed (LH) band are proposed in this article. A half‐mode substrate integrated waveguide (HMSIW), complementary split‐ring resonators (CSRRs), and varactors are embedded on the same planar platform to implement the resonant‐type approach of metamaterial transmission line and tuning capability. The tuning of the passband frequency is generated by simple and single direct current (DC) voltages from 0 to 36 V, which are applied to each varactor on CSRRs. Different capacitance values and resonant frequencies are produced while maintaining a nearly constant absolute bandwidth and quality factor. About 6.5% tunability and 11.30% of 3‐dB fractional bandwidth is achieved around 2.30 GHz. The new electrically tunable BPFs are verified by a good agreement between the simulated and measured results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2458–2460, 2013
Microwave Tunable Notch Filter Based on Liquid Crystal Using Spiral Spurline Technology
Authors: Torrecilla Javier , Avila‐Navarro E. , Marcos Carlos , Urruchi Virginia , Sanchez‐Pena Jose M. , Arias Julia , Sanchez‐Lopez Maria M. 
Published: July 2013

ABSTRACTIn this article, the design, fabrication, and characterization of a tunable microwave notch filter based on liquid crystal (LC) using inverted‐microstrip technology is presented. A spiral spurline structure is used because of its good performance as a single‐resonator notch filter. Based on the LC dielectric anisotropy, a voltage‐controlled rejection frequency of the filter is achieved, ranging from 3.40 to 3.75 GHz, which means that the tuning range relative to the central rejection frequency is about 10%. At the same time, this device exhibits negative group delay around the rejection frequency and the measured values throughout the tuning frequency range are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2420–2423, 2013
A Regulated 3.1–10.6 GHz Linear Dual‐Tuning Differential Ring Oscillator For UWB Applications
Authors: Lu Li , Li Changzhi , Lin Jenshan 
Published: July 2013

ABSTRACTA regulated linear dual‐tuning differential ring oscillator has been designed and fabricated in UMC 0.13 μm CMOS process for ultra‐wideband applications. Measurement results demonstrated the large tuning range, high tuning linearity, fast band switching, low supply sensitivity, and acceptable phase noise. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2384–2389, 2013
A Wideband Frequency Synthesizer with High Frequency Resolution
Authors: Tian Ling , Liu Jiaqi 
Published: July 2013

ABSTRACTThis article presents the design and implementation of a wideband frequency synthesizer which uses a direct digital synthesis as a fractional divider in the phase‐locked loop. The frequency resolution is 7.1 × 10−5 Hz. A phase‐domain model of this synthesizer is analyzed and simulated. A formula of output phase noise is derived. The output phase noise of synthesizer is −124 dBc/Hz (10 kHz offset) at the frequency of 1 GHz. The frequency synthesizer model has been designed with advantages of wide bandwidth, low phase noise, high‐frequency resolution, low spurious, high frequency stability, and simple structure. With frequency multiplier and divider module, the frequency band of synthesizer can be extended from 250 MHz to 8 GHz. The module is suitable for communication instrument. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2454–2457, 2013
Development of 5.5‐GHz Band Pass Filter in All Silicon Multilayer Substrate with Air Dielectric
Authors: Seek Cho Young , Franklin Rhonda R. 
Published: July 2013

ABSTRACTA compact 5.5‐GHz band pass filter (BPF) with 12.7% 3‐dB bandwidth is developed in an all silicon multilayer substrate with air dielectric incorporated for WiMax applications. The topology of the BPF is a capacitively coupled fifth‐order Chebyshev BPF. Its volume is 9.3 × 8.5 × 0.6 mm3. Two design aspects—air dielectric and through silicon via (TSV) technology integration—play an essential role in the BPF implementation. The spiral inductor with an integrated air dielectric has quality factor and self‐resonant frequency improvement of 112 and 41%, respectively. The TSVs in the BPF design enables the implementation of two‐layer inductors with a low value of inductance. The volume of TSV in the two‐layer inductor is 75 × 75 × 200 μm3 and its inductance is 0.15 nH at 5 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2340–2345, 2013
Wide‐Locking Range Dual‐Band Injection‐Locked Frequency Divider
Authors: Jang Sheng‐Lyang , Wu Zhi‐Hong , Hsue Ching‐Wen , Teng Heng‐Fa 
Published: July 2013

ABSTRACTA wide locking range divide‐by‐2 CMOS LC‐tank injection locked frequency divider is proposed and is realized with two mixers in series and a cross‐coupled oscillator with dual‐resonance LC resonator to provide large output voltage swings at high‐ and low‐frequency bands. The dual‐band function can be obtained without switching. Measurement results show that at the supply voltage of 0.8 V, the free‐running frequency is from 3.571 to 3.974 GHz for the high‐frequency band and from 2.278 to 2.349 GHz for the low‐frequency band. At Vtune = 1.2 V, an external injected signal power of 0 dBm provides a low‐band divide‐by‐2 locking range (57.7%) from 2.87 to 5.2 GHz and a high‐band locking range (25.7%) from 7.1 to 9.2 GHz. At Vtune = 0 V an external injected signal power of 0 dBm provides a high‐band locking range (46.5%) from 5.6 to 9 GHz and a low‐band locking range (25.0%) from 2.8 to 3.6 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2333–2337, 2013
Coplanar Waveguide Reconfigurable Bandpass Filter Based on A Varactor Loaded Colinear Resonator
Authors: Wang Zhengpeng P. , Hall Peter S. , Kelly James , Gardner Peter 
Published: July 2013

ABSTRACTThis article reports a novel coplanar waveguide varactor‐tuned bandpass filter based on a colinear resonator. The equivalent circuit of the new filter is analyzed. The passband of the filter can be tuned from 0.68 to 1.37 GHz by varying the capacitance of the varactor diode. The insertion loss of this filter changes from 0.9 to 1.3 dB across the tuning range. The 3‐dB bandwidth changes from 141 to 153 MHz as the filter is tuned from 0.68 to 1.18 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2389–2393, 2013
Bandwidth Enhancement Using Z‐Shaped Defected Ground Structure for a Microstrip Antenna
Authors: Kandwal Abhishek , Sharma Rakesh , Kumar Khah Sunil 
Published: July 2013

ABSTRACTA novel design of a circular patch antenna having Z‐shaped defected ground structure is presented in this communication. The antenna is designed for X‐band applications. A wideband is obtained in the X‐band frequency range 8–12 GHz. The return loss and input impedance is measured experimentally and compared with the simulated results. Parameters like impedance bandwidth, voltage standing wave ratio, and antenna gain are calculated and discussed. Impedance bandwidth of about 1.2 GHz is obtained with a gain of 8.7 dBi and side lobe level of −20.1 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2251–2254, 2013
Size Reduction of Series‐Fed Two Dipole Array Antenna Using Top‐Loaded Elements
Authors: Yeo Junho , Lee Jong‐Ig 
Published: July 2013

ABSTRACTIn this article, a method for size reduction of a series‐fed two dipole array (STDA) antenna using top‐loaded elements is presented. In order to reduce the lateral size of a conventional STDA antenna, rectangular patch‐shaped top loading is used for the two dipole elements of the STDA antenna and a grooved ground plane is used by adding a patch at both ends of the ground plane. The effects of varying the length and width of the rectangular patch‐shaped top loading on the antenna performances, such as the input reflection coefficient and the realized gain, are investigated. A proposed size‐reduced STDA antenna covering a frequency band ranging from 1.7 GHz to 2.7 GHz with a gain > 5 dBi is designed and fabricated on an FR4 substrate. The total width of the fabricated prototype of the proposed antenna is reduced by approximately 14.3% compared to the conventional STDA antenna, and it presents a 48.7% bandwidth in the range of 1.68–2.76 GHz and a stable gain of 5.6–6.0 dBi with minimal degradation. Moreover, a front‐to‐back ratio is improved by about 0.7–4.8 dB. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2288–2293, 2013
Design and Optimization of New Compact Tunable 2.4‐GHz Band Pass Filter Using Coupled λ/2 Microstrip Open‐Loop Resonators and Mems‐Switch Technique
Authors: Boutejdar Ahmed , Omar Abbas , Burte Edmund 
Published: July 2013

ABSTRACTA new compact WLAN‐band pass filters are proposed using a half wavelength microstrip open‐loop and λ/2 microstrip resonators based on direct‐cross coupling method and micro electronic mechanical system (MEMS) technology. The filter is not only compact in size due to the slow‐wave effect, but also has multitransmission zeros at both low and high rejection bands, as well as low insertion loss in the pass band. A demonstration filter has been designed and tested. Simulation results almost agree with the measured results. Some discrepancy between them can still be observed, which can be attributed to the unexpected tolerance of fabrication. Due to the simplicity of the design and its fabrication, it shows that this type of band pass filter has great potential for actual applications in communication and other systems. By applying the MEMS technology, a switchable band pass filter based on the quadruplet filter is able to be designed. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2444–2450, 2013
A Temperature‐Insensitive Relative Humidity Sensor by using Polarization Maintaining Fiber‐Based Sagnac Interferometer
Authors: Wang Jianfeng , Liang Houhui , Dong Xinyong , Jin Yongxing 
Published: July 2013

ABSTRACTA relative humidity sensor based on two polarization maintaining fibers (PMFs) Sagnac interferometer with temperature compensation is presented by utilizing polyvinyl alcohol (PVA) as the sensitive cladding film. The proposed sensor is created through coating a thin layer of PVA onto a PMF from which a portion of the cladding is etched. PVA‐coated PMF is for air relative humidity measurement and the other section PMF is for temperature compensation. The results show that the dip wavelength of the transmission spectrum shifts with the relative humidity with a high sensitivity of 111.5 pm/%RH. Meanwhile the sensor is insensitive to environmental temperature change with thermal‐dependent coefficient of 7.2 pm/°C. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2305–2307, 2013
Design of a Printed Dipole Array Antenna with Wideband Power Divider and RF Switches
Authors: Huang Jhin‐Fang , Wen Jiun‐Yu , Lai Wen‐Cheng 
Published: July 2013

ABSTRACTIn this article, we use pattern‐diversity technique to combine a RF single‐pole double‐throw (SPDT) switch with an antenna array together in order to reduce the signal distortion caused by multipath fading. In addition, in order to improve the way controlling the SPDT switch by software, a novel circuit structure which will control antenna pattern switching automatically by hardware is also developed. Return loss and radiation patterns are presented and compared with the measured results. Good agreement is achieved between computed and measured results and illustrates the validity of the designed method. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2410–2413, 2013
Wavelength Tuning for LiNbO3 Photonic Sensor to Have Linear Operation Point
Authors: Zhang Jiahong , Chen Fushen , Sun Bao , Li Chengxin 
Published: July 2013

ABSTRACTA new method to control the bias angle of asymmetric Mach–Zehnder interferometer‐based LiNbO3 photonic sensor for accurate intensive E‐field measurement has been proposed and experimentally demonstrated in this article. By adjusting the wavelength of a tunable laser using a microcontroller unit, the sensors can have a linear operating point while not distort the E‐field under measurement. This method successfully controls such LiNbO3 photonic sensor without distorting the output optical waveform. Linear characteristic of this sensing system with proposed control system has been measured and the correlation coefficient between measured and fitting is 0.999 from 160 to 840 Kv/m. All these prove wavelength tuning is available for photonic sensors to detected and extract E‐field accurately. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2326–2329, 2013
Dual‐Frequency and Dual‐Mode Circular Patch Antennas Based on Epsilon‐Negative Transmission Line
Authors: Hou Quanwen , Tang Hangfei , Liu Yahong , Zhao Xiaopeng 
Published: July 2013

ABSTRACTDual‐frequency and dual‐mode circular patch antennas based on epsilon‐negative (ENG) transmission line have been investigated. By input impedance matching, the TM01 mode with omnidirectional radiation pattern and TM11 mode with directional radiation pattern can be excited at two separate frequencies, and then the dual‐frequency and dual‐mode operation is achieved. Compared with the conventional dual‐frequency or dual‐mode patch antennas, the new designed antenna only need one patch and one feed. More important, the omnidirectional mode of proposed antenna can be excited at lower frequency than directional mode, and the frequency ratio of the two modes can be tuned by changing the number of the ENG unit cell. The performances of the proposed antennas are studied numerically and experimentally. The measured results are in good agreement with the simulated ones. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2393–2398, 2013
Erratum: Power Divider with Arbitrary Power Ratio and Arbitrary Ripple Level Using Filter Synthesis Techniques
Authors: Zhang Qingfeng , Caloz Christophe 
Published: July 2013

ABSTRACTOriginally published Microwave Opt Technol Lett 55:1819–1820, 2013; © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2524, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27945 (Original article DOI 10.1002/mop.27722)
The frontal space measurement in euploid and aneuploid pregnancies at 11–13 weeks' gestation
Authors: Yazdi Britta , Riefler Peter , Fischmüller Kristina , Sonek Jiri , Hoopmann Markus , Kagan Karl Oliver 
Published: July 2013

ABSTRACTObjectiveThe aim of this study is to evaluate whether the measurement of the frontal space (FS) improves first trimester combined aneuploidy screening.MethodsWe have presented a retrospective study including 2D images of the nuchal translucency measurement of 300 euploid and 133 trisomic fetuses that were seen at the prenatal department at the University of Tuebingen, Germany. For the FS measurement, a mandibulo‐maxillary line (MML) was created by connecting the anterior edge of the mental protuberance and anterior edge of the maxilla. The MML was then extended upwards. A measurement was taken perpendicular from the MML to the skin line over the point of largest excursion of the fetal forehead. After transformation into z‐scores based on the crown rump length, the FS distribution in fetuses with trisomy 21, 18, and 13 was compared with the euploid group by using a student's t‐test.ResultsThe mean FS in euploid fetuses was 1.25 mm. In fetuses with trisomy 21, 18, and 13, the mean FS measurements were 2.96, 3.22, and 2.03 mm. In euploid and trisomy 21, 18, and 13 pregnancies, FS measurements were above the 95th centile in 5.3%, 41.1%, 34.3%, and 12.5% of the cases. The mean z‐scores were significantly higher in trisomy 21 and 18.ConclusionFirst trimester FS measurement may improve first trimester combined screening. © 2013 John Wiley & Sons, Ltd.
In vitro activity of novel in silico‐developed antimicrobial peptides against a panel of bacterial pathogens
Authors: Romani A. A. , Baroni M. C. , Taddei S. , Ghidini F. , Sansoni P. , Cavirani S. , Cabassi C. S. 
Published: July 2013

Antimicrobial‐peptide‐based therapies could represent a reliable alternative to overcome antibiotic resistance, as they offer potential advantages such as rapid microbicidal activity and multiple activities against a broad spectrum of bacterial pathogens.Three synthetic antimicrobial peptides (AMPs), AMP72, AMP126, and also AMP2041, designed by using ad hoc screening software developed in house, were synthesized and tested against nine reference strains. The peptides showed a partial β‐sheet structure in 10‐mM phosphate buffer. Low cytolytic activity towards both human cell lines (epithelial, endothelial, and fibroblast) and sheep erythrocytes was observed for all peptides. The antimicrobial activity was dose dependent with a minimum bactericidal concentration (MBC) ranging from 0.17 to 10.12 μM (0.4–18.5 µg/ml) for Gram‐negative and 0.94 to 20.65 μM (1.72‐46.5 µg/ml) for Gram‐positive bacteria. Interestingly, in high‐salt environment, the antibacterial activity was generally maintained for Gram‐negative bacteria. All peptides achieved complete bacterial killing in 20 min or less against Gram‐negative bacteria. A linear time‐dependent membrane permeabilization was observed for the tested peptides at 12.5 µg/ml. In a medium containing Mg2+ and Ca2+, the peptide combination with EDTA restores the antimicrobial activity particularly for AMP2041. Moreover, in combination with anti‐infective agents (quinolones or aminoglycosides) known to bind divalent cation, AMP126 and AMP2041 showed additive activity in comparison with colistin.Our results suggest the following: (i) there is excellent activity against Gram‐negative bacteria, (ii) there is low cytolytic activity, (iii) the presence of a chelating agent restores the antimicrobial activity in a medium containing Mg2+ and Ca2+, and (iv) the MBC value of the combination AMPs–conventional antibiotics was lower than the MBC of single agents alone. Copyright © 2013 European Peptide Society and John Wiley & Sons, Ltd.
Average consensus of continuous‐time multi‐agent systems with quantized communication
Authors: Wu Yongjun , Wang Long 
Published: July 2013

SUMMARYThis paper focuses on the average consensus problem of first‐order and second‐order continuous‐time multi‐agent systems with logarithmic quantized information transmission. The balanced and strongly connected digraphs are utilized to characterize the interaction topologies between agents. Based on the state estimation, distributed state updating mechanisms are introduced for every agent such that all agents’ states achieve average consensus asymptotically. By means of differential inclusion theory, we discuss the existence and convergence property of the Krasovskii solutions to the closed‐loop system models. By designing the proper control gain parameters and quantizer accuracy, two sufficient conditions are established to guarantee the achievement of average consensus. Finally, two numerical simulations are provided to illustrate the effectiveness of theoretical results. Copyright © 2013 John Wiley & Sons, Ltd.
A case study of software process improvement with CMMI‐DEV and Scrum in Spanish companies
Authors: Garzás Javier , Paulk Mark C. 
Published: July 2013

ABSTRACTOne of the most commonly used agile methods is Scrum. Capability Maturity Model Integration for Development (CMMI‐DEV) is currently the de facto framework for process improvement and for determining the organizational maturity of software development companies. CMMI‐DEV and Scrum share certain characteristics, and even though they were developed for different purposes, they can be complementary to each other; and as such, they are not in competition. This paper presents a case study of the relationship between level 2 of CMMI‐DEV 1.3 and Scrum. This research has focused on the relationships between Scrum and level 2 of CMMI‐DEV 1.3. The objective of this research paper is to evaluate how Scrum helps implement a process model such as CMMI‐DEV.A detailed case study was conducted among Spanish IT companies. The case study was designed according to established guidelines for cases studies. There were eight principal activities: case study design, case selection, case study procedures and roles, data collection, analysis, plan validity, study limitations, and reporting.The results obtained show that most of the process areas of CMMI‐DEV level 2 had been improved by using Scrum. Other issues detected arose during the formal appraisals and illustrated how it is possible to verify with Scrum that the specific goals of CMMI‐DEV have been implemented. In addition, it highlights how the use of open‐source tools was useful in improving the process in the companies involved. Based on the case study carried out, the addition of Scrum methodologies may improve the increase in quality of software processes. Copyright © 2013 John Wiley & Sons, Ltd.
Clinical Issues‐August 2013
Authors: Ogg Mary J. , Conner Ramona L. 
Published: July 2013

This MonthEye protection in the ORKey words: eye protection, blood splatter, bloodborne pathogens, standard precautions.Types of acceptable eye protectionKey words: eye protection, goggles, face shield, bloodborne pathogens, personal protective equipment, PPE.Caring for patients with cardiovascular implantable electronic devicesKey words: electrosurgery, implantable cardioverter defibrillator, ICD, implantable electronic device, IED, cardiovascular implantable electronic device, CIED, implantable pacemaker.Determining acceptable clinical situations for immediate use steam sterilization (IUSS)Key words: flash sterilization, ophthalmology, immediate use steam sterilization, IUSS, cleaning and decontamination.
Implementing AORN Recommended Practices for a Safe Environment of Care
Authors: Hughes Antonia B. 
Published: July 2013

AbstractProviding a safe environment for every patient undergoing a surgical or other invasive procedure is imperative. AORN's “Recommended practices for a safe environment of care” provides guidance on a wide range of topics related to the safety of perioperative patients and health care personnel. The recommendations are intended to provide guidance for establishing best practices and implementing safety measures in all perioperative practice settings. Perioperative nurses should be aware of risks related to musculoskeletal injuries, fire, equipment, latex, and chemicals, among others, and understand strategies for reducing the risks. Evidence‐based recommendations can give practitioners the tools to guide safe practice.
Characterization ofDicrocoelium dendriticumisolates from small ruminants in Shaanxi Province, north-western China, using internal transcribed spacers of nuclear ribosomal DNA
Authors: Bian Q.Q. , Zhao G.H. , Jia Y.Q. , Fang Y.Q. , Cheng W.Y. , Du S.Z. , Ma X.T. , Lin Q. 
Published: July 2013

AbstractThe genetic variations in internal transcribed spacers (ITS) spanning ITS-1, 5.8S and ITS-2 rDNA ofDicrocoelium dendriticum, isolated from sheep and goats in four geographical regions in Shaanxi province, were examined. The lengths of ITS-1, 5.8S and ITS-2 rDNA sequences forD. dendriticumwere 749 bp, 161 bp and 234 bp, respectively. Intra-specific sequence variations ofD. dendriticumwere 0–0.5% for ITS-1 and 0–1.3% for ITS-2 rDNA, while the inter-specific variations among species in genusDicrocoeliumin ITS-2 rDNA were 3.4–12.3%. Phylogenetic analysis based on sequences of ITS-2 rDNA showed that allD. dendriticumisolates in the present study were grouped with referenceD. dendriticumisolates from sheep and goats, andD. dendriticumisolates from cattle and Japanese serow were clustered in a sister clade. However, the phylogenetic tree could not reveal geographically genetic relationships ofD. dendriticumisolates in different origins and hosts. These findings provided basic information for further study of molecular epidemiology and control ofD. dendriticuminfection in Shaanxi province as well as in the world.