bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quadrature Operation Point Locked Techniques for Interrogating Extrinsic Fabry‐Perot Interferometric Sensors
Authors: Shang‐hui Xiao , Yi Jiang , Da Liu , Jun Tang 
Published: June 2013

ABSTRACTA quadrature operation point locked technique for interrogating extrinsic Fabry‐Perot interferometric (EFPI) sensors is experimentally demonstrated. The voltage of quadrature operation point is set as the reference, and the output signal from the EFPI is filtered and compared with the reference. The difference voltage is used to shift the wavelength of the laser by changing the operation temperature. Experimental results show that the interrogation system can be locked at the quadrature operation point within a temperature range of 50°C. A linear output is realized when the system is locked. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2117–2120, 2013
A Wideband Cmos Phase Shifter With A Phase Tuning Bit for Ku‐Band Mobile Satellite Communication
Authors: Cho Moon‐Kyu , Kim Jeong‐Geun , Baek Donghyun 
Published: June 2013

ABSTRACTThis article presents a Ku‐band switched path type phase shifter in a standard 0.13 µm CMOS technology. The phase shifter consists of phase shifting filter networks, DPDT and SPDT switches, a tuning bit, and digital control logic. The phase coverage of the phase shifter is 354° with the LSB of 5.625°. The measured insertion loss is less than 16 dB. The input and output return losses are more than 12 dB. The RMS phase error and amplitude variation are less than 7.6° and 0.3 dB at 10.7–15 GHz, respectively. When the tuning bit is activated, the RMS phase error of 6.3° and the RMS amplitude variation of 0.4 dB are achieved at 10.7–15 GHz. The input P1dB over ∼11 dBm is achieved at 10–15 GHz. The current consumption is nearly zero with 1.2 V supply voltage. The chip size is 1.46 × 0.82 mm2 including pads. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2120–2124, 2013
Reduction of Cross Polarization of Slotted Microstrip Antenna Array Using Spiral‐Ring Resonator
Authors: Kumar Ghosh Chandan , Rana Biswarup , Parui Susanta Kumar 
Published: June 2013

ABSTRACTDesign of a (2 × 2) E‐shaped microstrip patch antenna array integrated with spiral‐ring resonators (SRRs) is introduced for the reduction of cross‐polar (XP) radiation. The addition of SRRs in the array structure does not affect other characteristics of the array antenna. The array is designed to function in the 5.25 GHz that corresponds to IEEE 802.11a wireless LAN application. The characteristic analysis such as return loss (RL), bandwidth (BW), and radiation patterns of the antenna with and without SRRs have been investigated. The array offers a BW of 405 MHz (for RL < −10 dB) covering frequencies ranges from 5.175 to 5.580 GHz and gain of 12.84 dBi has been achieved. The array has been studied both numerically and experimentally by introducing SRRs. The SRR geometry has been optimized for minimum XP radiation. The XP radiation has been reduced by 7 dB with two SSRs and 12.0 dB by four SRRs of similar geometry, placed in between the patch elements of the array structure. Prototype antennas with and without SRRs have been fabricated tested and a remarkable agreement is obtained between the measured and the simulated results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2083–2088, 2013
Miniaturized Triband Bandpass Filter Using Short‐Stub‐Loaded Resonator with High Selectivity
Authors: Xue Shu Jian , Gao Li , Zhang Xiu Yin 
Published: June 2013

ABSTRACTA miniaturized triband bandpass filter with high selectivity is presented in this article. The proposed filter utilizes a short‐stub‐loaded resonator, which can miniaturize the circuit size. The passband frequencies can be controlled individually. To stimulate the tri‐passband responses, a novel feeding structure is adopted. Seven transmission zeros can be generated by multitransmission paths. To verify the proposed idea, an experimental filter is implemented. High skirt selectivity and high suppression levels are observed in the measured results. The circuit area of the filter is 0.12 λg × 0.14 λg, featuring compact size. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2081–2083, 2013
UWB Bandpass Filter Based on Ring Resonator
Authors: Oh Sangyeol , Song Junhyop , Lee Jaehoon 
Published: June 2013

ABSTRACTA new ultra‐wideband bandpass filter is proposed, with a ring resonator and two stepped‐impedance stubs to provide good wideband filtering performance and sharp rejection skirts. Interdigital coupled lines are placed at both ends of the ring resonator as input and output feed lines. The use of interdigital coupled lines makes it possible for the first three resonances of the ring resonator to be closer to wideband characteristics. By cutting apertures in the ground plane under the interdigital coupled lines, the coupling effect between the feed lines and the ring resonator can be increased, so that the passband characteristics can be improved. By adding two stepped‐impedance stubs to the ring resonator, sharp rejection skirts can be obtained in the passband. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2047–2051, 2013
Broadband High‐Power GaN SPDT Switch Using Stacked‐Shunt Fets and Resonance Inductors
Authors: Hettak Khelifa , Ross Tyler N. , Cormier Gabriel , Wight Jim S. 
Published: June 2013

ABSTRACTThis article presents a new GaN HEMT‐based high‐power single‐pole double‐throw (SPDT) switch operating over the X‐band frequencies. The GaN SPDT MMIC switch is presented, having good return loss (better than 16.8 dB) and insertion loss (1.4 dB) measured across X‐band. It also has a very high power–handling capability, with a measured 1 dB compression point of 38 dBm. The techniques and design principles leading to this level of performance are discussed. Circuit performance is confirmed by experimental and simulation results, which are in good agreement up to 20 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2093–2095, 2013
Closely Spaced, Dual‐Slm Fiber Laser for Microwave Generation With A Single Fbg
Authors: Ahmad Harith , Latif Amirah Abd. , Harun Sulaiman Wadi 
Published: June 2013

ABSTRACTIn this work, a dual‐wavelength fiber laser with single‐longitudinal‐mode (SLM) characteristics is proposed and demonstrated. The system uses a 1‐m long highly doped erbium doped fiber (EDF) as the primary gain medium while a 1533‐nm fiber Bragg grating acts as a wavelength selection mechanism. Unpumped EDFs are used to suppress side‐modes and to give SLM characteristics in the output wavelengths. A modulator, operating at 130.0 KHz generates the dual‐wavelength output at 1532.89 and 1533.23 nm with a spacing of 29.3 GHz. Radio frequency spectrum analyzer (RFSA) measurements indicate no spiking at the lower frequencies, thus confirming the SLM nature of the individual wavelengths. The system is very stable and suitable for a variety of applications, particularly as Terahertz sources. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2011–2015, 2013
Design and Analysis of a Compact Ultra‐Wideband Antenna with a Band‐Notch Characteristic
Authors: Zang Jia‐Wei , Wang Xue‐Tian 
Published: June 2013

ABSTRACTWe present a compact printed ultra‐wideband (UWB) antenna with a band‐notched characteristic. A modified ground plane is introduced to achieve a wide impedance bandwidth from 3 to 13.4 GHz with S11<‐ 10dB. By inserting an arc‐shaped slot in the radiating patch, the notch frequency band at 3.4–3.7 GHz is obtained. An equivalent circuit model and parametric studies are given to explain the principle of the proposed UWB antenna. The relationship between the current distributions and radiation patterns is discussed. Simulated and measured results show that the proposed antenna has good impedance matching, stable radiation patterns and constant gain. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2236–2240, 2013
Equivalent Circuit Model Research of Terahertz Wave Absorber Based on Metamaterial
Authors: Hu Jian‐rong , Li Jiu‐sheng 
Published: June 2013

ABSTRACTAn equivalent circuit model is proposed to estimate the absorbance characteristics of the proposed terahertz wave absorber based on metamaterial. The component can be optimized to achieve high absorption of different frequency of the incident electromagnetic wave by adjusting physical dimensions and material parameters. The fabricated device was characterized by using a Fourier transform infrared spectrometer. The designed absorber demonstrated excellent absorbance compared with previously reported metamaterial‐based terahertz wave absorbers, which exhibited 99.3% absorbance at 0.575 THz. The simulation and measurement results show that the absorber is an excellent terahertz wave collector. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2195–2198, 2013
Asymmetrically Fed Slotted Rectangular Monopole Antenna for Dual Polarization
Authors: Krishna R.V.S Ram , Kumar Raj 
Published: June 2013

ABSTRACTA novel design of a coplanar waveguide‐feed printed monopole antenna for dual‐polarization applications is proposed in this article. The monopole is formed of a rectangular patch embedded with an hourglass‐shaped slot. The overall dimensions of the antenna are kept at 40 × 40 mm2. The measured impedance bandwidth achieved by the antenna is 123% from 2.5 to 10.5 GHz. The measured radiation pattern is omnidirectional in H‐plane and bidirectional in E‐plane. A low polarization ratio (<10 dB) arising from increased cross polarization due to asymmetric feed and slot in patch is obtained in the frequency band of 4.4 to 6.6 GHz. This makes the antenna useful for dual‐polarization applications in this band. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2160–2165, 2013
A LTCC Filter Using Multilayered Stepped Impedance Resonators
Authors: Niu Lirong , Shi Hongyu , Liu Zhenwu , Jiang Yansheng , Zhang Anxue 
Published: June 2013

ABSTRACTAn X‐band filter with low insertion loss and high stop‐band rejection based on low temperature co‐fired ceramic technology is designed in this article. The filter is achieved using multilayered stepped‐impedance resonators structure. By converting microstrip lines of different layers to coplanar microstrip lines, the I/O ports are realized by the surface feed structure. Finite transmission zeros are distributed in the lower and upper stop‐bands to achieve a high stop‐band rejection. The measured results of the filter coincide well with the electromagnetic simulation results. The filter exhibits an insertion loss of lower than 1.2 dB from 9.4 to 10.1 GHz, and achieves 36 dB and 41.4 dB of attenuation at 7.8 and 11.7 GHz, respectively. The size of the filter is 5.0 × 4.5 × 1.96 mm3. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2003–2006, 2013
12.5‐Gb/s Highly Flexible 180° Polymer Waveguide on Optical and Electronic Printed Circuit Board
Authors: Tsou Chih‐Yuan , Hsu Shih‐Hsiang , Wang Chih‐Ming , Tseng Sheng‐Chieh 
Published: June 2013

ABSTRACTThe optical interconnection using polymer waveguides on the optical and electronic printed circuit board was designed and fabricated for low optical propagation loss and high speed data rate. The ray tracing simulation for the tolerance study of optical interconnection and fabrication was carried by the LightTools commercial software. In order for the easy fabrication and high position accuracy, the polymer waveguides were forming 45° reflective mirrors using dicing approach and followed by the e‐beam deposition for silver coated 90° beam turning. The interface coupling loss was discussed in different polishing grit sizes and dicing approaches. Upto 12.5 Gb/s transmission rate and 0.1 dB/cm optical propagation loss were demonstrated in the board‐embedded flexible polymer waveguide. The Q factor of 7.4 at 12.5 Gb/s and additional optical loss of 0.3 dB were experimentally shown on the 2‐mm bending radius and 180° curvature angle. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1999–2003, 2013
Design of a Very Compact UWB Monopole Antenna with Microstrip‐FED
Authors: Sun Y. Y. , Cheung S. W. , Yuk T. I. 
Published: June 2013

ABSTRACTThe article presents the design of a compact ultrawideband (UWB) monopole antenna with microstrip‐fed. The antenna has a simple elliptical‐shaped radiator. The very compact size of 11 × 34 = 374 mm2 and wide bandwidth of 3.1–12.6 GHz are achieved by simply using a three‐step staircase on both sides of the feed line and a slot on the ground plane. The antenna is studied and designed on a Rogers substrate using computer simulation and measured using Satimo Starlab system. The effects of feeding cable used in measurement are also studied. Simulated and measured results agree very well. Results show that the antenna has a wide bandwidth, stable realized gain and efficiency, and very stable radiation patterns across the UWB from 3 to 12 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2232–2236, 2013
Broadband Square Slot Circularly Polarized Antenna for Wimax and Wlan Applications
Authors: Pouyanfar Negin 
Published: June 2013

ABSTRACTA compact coplanar waveguide‐fed circularly polarized antenna with corner truncated ground for broadband wireless applications is presented. The antenna is designed to have a U‐shaped feedline in conjunction with an inverted L‐strip and a 45° bent strip to cover a fractional bandwidth of more than 103% (2.69–8.83 GHz) and fractional 3‐dB axial ratio bandwidth of 58.93% (2.92–5.36 GHz). Triangle shaped pieces are removed from top corners of the antenna to excite circular polarization. The antenna is manufactured and its parameters are measured. It has been shown that there is a good agreement between simulated and experimental results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2191–2195, 2013
Development of a serum‐free defined system employing growth factors for preantral follicle culture
Authors: Park Young Hyun , Gong Seung Pyo , Kim Hwa Young , Kim Gil Ah , Choi Jun Hee , Ahn Ji Yeon , Lim Jeong Mook 
Published: June 2013

SUMMARYThis study was conducted to evaluate if mouse preantral follicles can yield developmentally competent oocytes following culture in serum‐free, defined medium. Donor follicles were obtained from 14‐day‐old B6CBAF1 mice, and cultured in α‐MEM‐Glutamax medium. The replacement of fetal bovine serum with knockout serum replacement (KSR) did not significantly reduce follicle growth or oocyte maturation in vitro, although it significantly reduced the development of oocytes after activation. Regardless of the replacement medium, follicle growth was not influenced by the addition of leukemia inhibitory factor (LIF). The addition of 100 ng/ml stem cell factor (SCF) to the KSR‐supplemented serum‐free medium significantly stimulated follicle development, which further improved blastocyst formation after oocyte activation. On Day 3 of culture, a significant increase in Bmp7 expression was detected in the SCF‐containing medium compared with the serum‐containing medium, whereas Gdf9 and Amh were increased in the serum‐containing medium. A significant increase in estradiol production was detected under serum‐free conditions, but minimal progesterone secretion was detected throughout the culture period. In conclusion, serum‐free media can be used to optimize ovarian follicle cultures, and the addition of SCF is beneficial for deriving developmentally competent oocytes through follicle culture. Mol. Reprod. Dev. 80: 725–733, 2013. © 2013 Wiley Periodicals, Inc.
IKZF1andCRLF2gene alterations correlate with poor prognosis in JapaneseBCR‐ABL1‐negative high‐risk B‐cell precursor acute lymphoblastic leukemia
Authors: Yamashita Yuka , Shimada Akira , Yamada Tomomi , Yamaji Kazutaka , Hori Toshinori , Tsurusawa Masahito , Watanabe Arata , Kikuta Atsushi , Asami Keiko , Saito Akiko M. , Horibe Keizo 
Published: June 2013

AbstractBackgroundGenome‐wide analysis studies have demonstrated thatIKZF1,CRLF2, andJAK2gene alterations correlate with poor prognosis in pediatric B‐cell precursor acute lymphoblastic leukemia (BCP‐ALL). However, the prognostic significance for these gene alterations has not been clarified in Japanese patients.ProcedureA total of 194 patients with BCP‐ALL enrolled in the Japanese Children's Cancer & Leukemia Study Group ALL 2004 clinical trial were assessed for the presence of three different gene alterations:IKZF1deletions,CRLF2expression andJAK2mutation.ResultsIKZF1deletions andCRLF2‐high expression were identified in 22 of 177 (12%) patients and in 15 of 141 (11%) patients, respectively. However,JAK2R683 mutation was detected only one of 177 patients. The 4‐year event‐free survival (4y‐EFS) was different when comparing patients with or withoutIKZF1deletions (68.2% vs. 85.2%;P = 0.04) and was also different when comparing patients with differentCRLF2expression levels (high, 66.7% vs. low, 88.1%;P = 0.03). The differences in 4y‐EFS were statistically significant in patients with ALL in the National Cancer Institute (NCI)‐high risk group (HR‐ALL) (IKZF1deletions: yes, 58.3% vs. no, 87.0%,P = 0.02;CRLF2expression: high, 55.6% vs. low, 85.3%,P = 0.04) but not in patients with ALL in the NCI‐standard risk group (SR‐ALL;IKZF1deletions: yes, 80.0% vs. no, 84.4%,P = 0.75;CRLF2expression: high, 83.3% vs. low, 89.2%,P = 0.77). Coexistence ofIKZF1deletions andCRLF2‐high expression associated with poor outcomes.ConclusionsIKZF1deletions andCRLF2‐high expression predicted poor outcomes in patients with HR‐ALL but not in patients with SR‐ALL in our Japanese cohort. Pediatr Blood Cancer 2013;60:1587–1592. © 2013 Wiley Periodicals, Inc.
General practitioner involvement in follow‐up of childhood cancer survivors: A systematic review
Authors: Singer Sarah , Gianinazzi Micòl E. , Hohn Anna , Kuehni Claudia E. , Michel Gisela 
Published: June 2013

AbstractBackgroundAn increasing number of childhood cancer survivors need long‐term follow‐up care. Different models address this problem, including that of follow‐up by general practitioners (GP). We describe models that involve GPs in follow‐up for childhood cancer survivors, their advantages and disadvantages, clinics that employ these models, and the elements essential to high‐quality, GP‐led follow‐up care.ProcedureWe searched four databases (PubMed [including Medline], Embase, Cochrane, and CINAHL) without language restrictions.ResultsWe found 26 publications, which explicitly mentioned GP‐led follow‐up. Two models were commonly described: GP‐only, and shared care between GP and pediatric oncology or late effects clinic. The shared care model appears to have advantages over GP‐only follow‐up. We found four clinics using models of GP‐led follow‐up, described in five papers. We identified well‐organized transition, treatment summary, survivorship care plan, education of GPs and guidelines as necessary components of successful follow‐up.ConclusionScarcity of literature necessitated a review rather than a meta‐analysis. More research on the outcomes of GP‐led care is necessary to confirm the model for follow‐up of childhood cancer survivors in the long term. However, with the necessary elements in place, the model of GP‐led follow‐up, and shared care in particular, holds promise. Pediatr Blood Cancer 2013;60:1565–1573. © 2013 Wiley Periodicals, Inc.
Hypoxic tumor microenvironment in advanced retinoblastoma
Authors: Sudhakar Job , Venkatesan Nalini , Lakshmanan Shruthi , Khetan Vikas , Krishnakumar Subramanian , Biswas Jyotirmay 
Published: June 2013

ABSTRACTPurposeRetinoblastoma (RB) is a malignant tumor of infancy and childhood. Unfavorable therapeutic response is still a quest in many tumors, including retinoblastoma. Hypoxic tumor microenvironment is one of the factors that determine the therapeutic response in many tumors. The purpose of this study was to determine the presence of hypoxia and its related proteins; Hypoxia inducible factor‐1α (HIF‐1α), Carbonic anhydrase IX (CA IX) and survivin in RB and their association with clinicopathological features.Materials and MethodsWe evaluated the expression of HIF‐1α and survivin by immunohistochemistry in 42 archival retinoblastoma tumors and CA IX; a hypoxia marker in 33 tumors in the same cohort. The expression was correlated with tumor groups based on invasion, differentiation and IIRC.ResultsExpression of HIF‐1α, survivin and CA IX was observed in 83% (35/42), 86% (36/42), and 93% (31/33) of tumors respectively. We observed no significance between HIF‐1α and CA IX expression in tumors with invasion, differentiation and in IIRC tumor groups. An increased survivin expression was observed in group E tumors than in group D tumors (P = 0.044). A significant association was observed between HIF‐1α and survivin in differentiated (r = −0.582;P = < 0.01) and undifferentiated tumors groups (r = 0.513;P = <0.012). A similar significant association was observed between HIF‐1α and CA IX in tumors with high immunoreactivity for HIF‐1α (r = 0.833;P = <0.01).ConclusionBased on these observations, we propose that HIF‐1α pathway is deregulated in RB. The role of drug resistance and the potential of targeting HIF‐1α, CA IX, and survivin in RB should further examined. Pediatr Blood Cancer 2013;60:1598–1601. © 2013 Wiley Periodicals, Inc.
Impact of an Immunoglobulin G–Specific Enzyme‐Linked Immunosorbent Assay on the Management of Heparin‐Induced Thrombocytopenia
Authors: Sylvester Katelyn W. , Fanikos John , Anger Kevin E. , Matta Lina , Southard Robert A. , Beik Nahal , Lemire Susan J. , Dorfman David M. , Berliner Nancy 
Published: June 2013

Study ObjectiveTo evaluate whether using an immunoglobulin G (IgG)‐specific platelet factor 4 (PF4) test reduces the rate of positive PF4 results and has an impact on prescribing practices of nonheparin anticoagulants (direct thrombin inhibitors and fondaparinux) in patients assessed for heparin‐induced thrombocytopenia (HIT).DesignSingle‐center prospective cohort study with a historical control group.SettingLarge academic medical center.PatientsA total of 672 patients assessed for HIT.InterventionPatients were assessed for HIT by using either an IgG‐specific PF4 enzyme‐linked immunosorbent assay (ELISA; 336 patients) or a nonspecific PF4 ELISA (336 patients; historical control group).Measurements and Main ResultsNo significant difference was noted in the proportion of patients with a low, intermediate, or high risk of HIT based on the 4Ts pretest clinical scoring system. The PF4 ELISA was positive in 6.9% versus 11.3% of patients (p=0.04) in the IgG‐specific and nonspecific cohorts, respectively. A smaller proportion of patients were prescribed a direct thrombin inhibitor in the IgG‐specific cohort (19.4% vs 25.9%; p=0.04). No significant difference in fondaparinux use was noted between the cohorts. The duration of direct thrombin inhibitor therapy, bleeding events, hospital length of stay, and in‐hospital mortality was similar in both cohorts.ConclusionUse of an IgG‐specific PF4 ELISA was associated with a lower rate of positive PF4 test results. Direct thrombin inhibitor prescribing was also significantly lower during the time period where the IgG‐specific PF4 ELISA was used, with no significant differences noted in safety outcomes.