bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cole–cole model for glucose‐dependent dielectric properties of blood plasma for continuous glucose monitoring
Authors: Karacolak Tutku , Moreland Elaine C. , Topsakal Erdem 
Published: March 2013

AbstractIn this study, we show a correlation between electrical properties (relative permittivity–εr and conductivity–σ) of blood plasma and plasma glucose concentration. In order to formulate that correlation, we performed electrical property measurements on blood samples collected from 10 adults between the ages of 18 and 40 at University of Alabama Birmingham (UAB) Children's hospital. The measurements are conducted between 500 MHz and 20 GHz band. Using the data obtained from measurements, we developed a single‐pole Cole–Cole model for εr and σ as a function of plasma blood glucose concentration. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1160–1164, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27515
Compact microstrip antenna for mobile communication
Authors: Chatterjee Samiran , Ghosh Kalyanbrata , Paul Joydeep , Chowdhury S.K. , Chanda (Sarkar) Debasree , Sarkar P.P. 
Published: March 2013

AbstractA single layer, single feed compact rectangular microstrip antenna is proposed. Resonant frequency has been reduced drastically by cutting unequal rectangular slots at the edge of the patch. Two rectangular slots are introduced at the left and right side of the patch to reduce the resonant frequency. The widths of the rectangular slots are different to improve the gain bandwidth performance of the antenna. The antenna size has been reduced by 73.9% when compared to a conventional rectangular microstrip patch antenna. The characteristics of the designed structure are investigated by using Method of Moment‐based electromagnetic solver, IE3D. There is a reasonable agreement between these simulated data and measured values. An extensive analysis of the return loss, radiation pattern, gain, and efficiency of the proposed antenna is shown in this paper. The simple configuration and low profile nature of the proposed antenna leads to easy fabrication and make it suitable for the applications in Wireless communication system. Mainly, it is developed to operate in the mobile communication range of 900 MHz–1.8 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:954–957, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27517
Design and implemention of very compact band‐stop filter with petal‐shaped stub for radar applications
Authors: Ojaroudi Nasser , Ojaroudi Mohammad , Habibi Reza 
Published: March 2013

AbstractIn this article, we introduce a compact microstrip band stop filter (BSF) at X‐band frequency range and this shall be used in local oscillator chain for X‐band transceiver. Presented microstrip filter consists of a transmission line with a petal‐shaped stub and a ground plane with a modified rectangular‐shaped defected ground structure (DGS). Operation frequencies of the filter can be easily controlled by changing four protruded T‐shaped strips in the petal‐shaped structure. The DGS slot evolved from photonic band gap (PBG) is embedded to achieve a good impedance matching and the required filter's characteristics. The proposed band‐stop filter has wide bandwidth from 8–12 GHz for X‐band Communications that can be used in Radar applications. Good agreement between simulated and measured results cause that excellent stop‐band performance could be obtained through the X‐band frequency range. The proposed microstrip filter fabricated on a Rogers RT/Duroid 5880 substrate with a relative dielectric constant of 2.2 and has a very small size of 10 × 15 mm2. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1130–1132, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27518
Indoor positioning based on global positioning system signals
Authors: Ozsoy Kerem , Bozkurt Ayhan , Tekin Ibrahim 
Published: March 2013

AbstractThe Global Positioning System (GPS) is highly reliable and accurate when used outdoors.However, in indoor environments, due to the additional signal loss incurred by the walls of the buildings, the detection and decoding of GPS signals becomes a difficult task. As a solution to the indoor area coverage problem, an indoor positioning system based on GPS repeaters and a modified positioning algorithm is proposed, designed, and tested. A prototype indoor positioning system for 1D/2D positioning is built using directional GPS antennas and low‐noise amplifiers (LNA). The modified positioning algorithm is used for the real time processing of captured live GPS data. All the system components are integrated and positioning is obtained for the evaluation of the system performance. Results of the experiments show that the proposed system can be used for indoor positioning in locations where there is no GPS signal reception. The proposed system facilitates the continuation of GPS services indoors with hardware additions to the buildings and only a software update to a standard GPS receiver. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1091–1097, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27520
Deep band‐notched ultra‐wideband planar monopole antenna using meander lines
Authors: Liu L. , Cheung S. W. , Yuk T. I. 
Published: March 2013

AbstractThe article presents the design of a planar ultra‐wideband (UWB) monopole antenna with a deep band‐notched characteristic. The antenna has an elliptical radiator fed by a microstrip line and a small ground‐plane size of 30×15 mm2. Two pairs of meander lines (MLs) are employed to implement the deep band‐notched characteristic. One pair of the MLs is placed closely on both sides of the microstrip‐feed line with one of their ends shorted to ground. The other pair is placed at the upper edges of the ground plane on the other side of the substrate. The frequency range of the notched band can be controlled by the dimensions of the MLs. In our studies, the notched band is designed in the frequency band from 5.1 to 5.85 GHz to suppress the signals in the WLAN system. The antenna is studied and optimized using computer simulation. For verification of simulation results, the antenna is fabricated and measured. Results show that, by using the two pairs of MLs, the gain of the antenna at the notch frequency can be suppressed by 14 dB, with the efficiency reduced to less than 5%. Due to the small ground‐plane size used in the antenna, the feeding cable used for measurements in the measurement equipment has significant effects on the measured results. This leads to large discrepancies between the simulated and measured results at low frequencies. To study this, the model of the feeding cable is also included in simulation and the results show that the discrepancies are substantially reduced. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1085–1091, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27521
1.9 μm lasing with Tm3+/Yb3+ co‐doped air‐clad fiber and 931 nm pumping
Authors: Saidin N. , Halder A. , Ghosh D. , Pal M. , Paul Mukul Chandran , Bhadra S. K. , Ali S. M. M. , Damanhuri S. S. A. , Ahmad H. , Harun Sulaiman Wadi 
Published: March 2013

AbstractA 1.9 μm single mode laser is demonstrated by employing a newly developed large mode area Tm3+/Yb3+ co‐doped air‐clad photonic crystal fiber (PCF) in conjunction with 931 nm pumping for the first time. The PCF has an Yb3+ and Tm3+ ion concentrations of about 16 × 10−19 and 4 × 10−19 ions/cc, respectively. The laser produces a maximum output power of 4.6 mW with an efficiency slope of 0.70% at a multimode pump power of 2.3 W with a 2.7 m long PCF in a linear cavity with two fiber Bragg grating. The threshold of the input pump power is obtained at around 1.3 W. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1124–1126, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27523
Compact CMOS branch‐line coupler using high‐Q slow‐wave transmission lines
Authors: Wang Sen , Huang Bo‐Zong 
Published: March 2013

AbstractThis article presents a miniaturized 90° coupler incorporating slotted conductor‐backed coplanar waveguide (S‐CBCPW) transmission lines (TLs) and four shunt capacitors. The periodically slotted ground achieves higher slow‐wave factor (SWF) or effective permittivity (εeff), and lower attenuation constant. Electrical characteristics of the S‐CBCPW TLs are investigated by different slotted ground layers. Moreover, trade‐offs among SWF, characteristic impedance, and electrical length for the design are also discussed. Finally, the measured 24‐GHz coupler not only features smallest normalized chip area among previously reported CMOS couplers but also demonstrates excellent results which are comparable to the designs at 60 GHz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1174–1178, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27525
Demonstration of acoustic vibration sensor based on microfiber knot resonator
Authors: Sulaiman A. , Muhammad M. Z. , Harun S. W. , Arof H. , Ahmad H. 
Published: March 2013

AbstractA compact microfiber‐based acoustic vibration sensor is demonstrated using microfiber knot resonator (MKR) structure, which is fabricated by flame brushing technique. It is observed that the extinction ratio of the resonant spectrum of the knot resonator is linearly proportional to the vibration amplitude. This is attributed to the interruption of the effective coupling of the MKR which is correlated with the exposed vibration force. It is also shown that the resonant wavelength shifts by about 0.19 nm as the normalized vibration energy is increased from 0 to 10%. The performance of the sensor is then further investigated by monitoring the fast Fourier transform (FFT) of the signal when the MKR is exposed to various vibration frequencies as a narrowband 1545 nm laser is injected into the MKR. In the spectra of the signals, the frequency of the applied vibration is clearly shown as it has the highest magnitude followed by the accompanying harmonics. This holds true for all vibration frequencies. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1138–1141, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27526
Broadband millimeter‐wave composite cavity backed antenna with bowtie exciter
Authors: Qu Shi‐Wei , Ng Kungbo 
Published: March 2013

AbstractA wideband cavity‐backed antenna is proposed in this article.For performance improvement, an elliptical composite cavity is adopted and it is excited by a rounded bowtie dipole through a transition from a microstrip line to a parallel strip line. To reduce the fabrication errors, the antenna aperture is designed to be over 0.84 wavelength at the lowest operating frequency, and the exciter is built on a substrate along with the transition by the printed circuit board (PCB) techniques. Measurements show that the antenna can be operated in a frequency band of 30.6–70 GHz for SWR ≤ 2 and stable radiation patterns. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1101–1104, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27528
Circular polarization patch antenna design with diagonal periodic metallic via holes
Authors: Jin Cheng , Li Rui , Bao Xiao‐Yue 
Published: March 2013

AbstractA circular polarization (CP) patch antenna is proposed for the first time in this article. The proposed antenna is developed based on a patch antenna combined with one row of diagonal periodic metallic via holes. By optimizing the location of the periodic metallic via holes, two orthogonal waves with 90° phase difference are excited using single feed and a CP patch antenna is obtained. A CP antenna is designed based on the proposed structure and simulated by Ansoft HFSS. The designed CP antenna is fabricated and measured. The measured results present return loss |S11| > 10 dB from 10.4 to 11.6 GHz. The radiation pattern is also measured, and it exhibits good circular polarization property with 3‐dB axial ratio (AR) of 1.2 dB and gain of 4.02 dBic. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett1100, 2013; 1097 this 1100 online at wileyonlinelibrary.com. DOI 10.1002/mop.27529
Metamaterial inspired fabry–pérot antenna with cascaded frequency selective surfaces
Authors: Brito Davi B. , d'Assunção Adaildo G. , Maniçoba Robson H. C. , Begaud Xavier 
Published: March 2013

AbstractA Fabry–Pérot antenna can be realized by employing a frequency selective surface (FSS), with suitable frequency selective properties, placed at an adequate distance from a perfect electric ground plane, in our case the ground plane is a metamaterial high impedance surface (HIS). The FSS is a multilayer partially reflective surface (PRS) realized by a periodic distribution of metallic elements printed on a dielectric slab. It can almost entirely reflect incident waves. By inserting a patch antenna between the ground plane and the FSS, a highly directive antenna can be obtained. Metamaterials are artificial structures that can be designed to exhibit unusual electromagnetic properties not observed in natural materials. The HIS is a metamaterial structure. The HIS does not support propagating surface waves, and it reflects electromagnetic waves with no phase reversal. Simulated and experimental results are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:981–985, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27531
A new algorithm for contact detection between spherical particle and triangulated mesh boundary in discrete element method simulations
Authors: Hu L. , Hu G.M. , Fang Z.Q. , Zhang Y. 
Published: March 2013

SUMMARYIn discrete element method (DEM) simulations of real scale, the spherical particles are commonly employed for increasing the computation speed, and the complex boundary models are represented by triangle meshes with controllable accuracy. A new contact detection algorithm has been developed to resolve the contacts between the spheres and the triangle mesh boundaries. The application of the barycentric coordinates makes this algorithm more efficient to identify contacts in the intersection test. As a particle probably collides with several triangles at the same time, the multiple contacts would be reported as face contacts, edge contacts, or vertex contacts. Moreover, the particle embedding in a triangle can be also contact with the edges or vertices of the next triangles. These contacts should be considered as invalid for updating contact forces in the DEM. To exclude invalid records from the multiple contacts, the algorithm gives attention to the mesh structure nearby contacts and analyzes all possible collision situations. Numerical experiments have been conducted to verify this algorithm by using the algorithm in the DEM simulation framework. The numerical results suggest that the algorithm can resolve all contacts precisely and stably when the spherical particles collide on the complex boundary circumstances. Copyright © 2013 John Wiley & Sons, Ltd.
Superconvergence of a full‐discrete combined mixed finite element and discontinuous Galerkin method for a compressible miscible displacement problem
Authors: Yang Jiming , Chen Yanping , Xiong Zhiguang 
Published: March 2013

AbstractAn efficient time‐stepping procedure is investigated for a two‐dimensional compressible miscible displacement problem in porous media in which the mixed finite element method with Raviart‐Thomas space is applied to the flow equation, and the transport one is solved by the symmetric interior penalty discontinuous Galerkin approximation on Cartesian meshes. Based on the projection interpolations and the induction hypotheses, a superconvergence error estimate is obtained. During the analysis, an extension of the Darcy velocity along the Gauss line is also used in the evaluation of the coefficients in the Galerkin procedure for the concentration. © 2013 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq, 2013
Isotopically depleted carbon in the mid‐depth South Atlantic during the last deglaciation
Authors: Tessin A. C. , Lund D. C. 
Published: March 2013

AbstractThe initial rise in atmospheric CO2 during the last deglaciation was likely driven by input of carbon from a 13C‐depleted reservoir. Here we show that high resolution benthic foraminiferal records from the mid‐depth Brazil Margin display an abrupt drop in δ13C during Heinrich Stadial 1 (HS1) that is similar to but larger than in the atmosphere. Comparing the Brazil Margin results to published records from the North Atlantic, we are unable to account for the South Atlantic δ13C data with conservative mixing between northern and southern component water masses. Rapid input of abyssal water from the Southeast Atlantic could account for deglacial δ13C anomalies at the Brazil Margin but it would require a reversal in deep water flow direction compared to today. A new mid‐depth water mass may explain similar HS1 δ13C values in both the North and South Atlantic, but contrasting oxygen isotopic values between the two basins do not support such a scenario. Instead, it appears that δ13C behaved non‐conservatively during the deglaciation, possibly reflecting the input of carbon from an isotopically depleted source.
A case study of personalized therapy for osteosarcoma
Authors: Davis Lara E. , Hofmann Nicolle E. , Li Guangheng , Huang Elaine T. , Loriaux Marc M. , Bracha Shay , Helfand Stuart C. , Mata John E. , Marley Kevin , Mansoor Atiya , Tyner Jeffrey W. , Abraham Jinu , Séguin Bernard , Keller Charles 
Published: March 2013

AbstractBackgroundEffective targeted therapies are needed in sarcomas, but the biological heterogeneity of these tumors has presented a challenge to clinical integration of small molecule inhibitors in sarcoma treatment. Here we outline a process to personalize therapy for sarcomas through a case study of a canine with spontaneous osteosarcoma.ProcedureRapid establishment of a primary tumor cell culture is described, followed by efficient functional characterization of the tumor that identified the Src inhibitor dasatinib as the most effective targeted therapy for this individual dog.ResultsAdjuvant dasatinib was administered for a total of 26 weeks following treatment with chemotherapy. Pharmacokinetic studies confirm that a therapeutic serum concentration was achieved at a tolerable dose of 0.75 mg/kg/day. The canine patient remains without evidence of recurrent disease 24 months following initial diagnosis.ConclusionsThe approach described through this illustrative case study is broadly applicable and might be used for other solid tumors in canines as well as in humans. Pediatr Blood Cancer 2013;60:1313–1319. © 2013 Wiley Periodicals, Inc.
RASSF1A in maternal plasma as a molecular marker of preeclampsia
Authors: Papantoniou Nikolas , Bagiokos Vassilis , Agiannitopoulos Kostantinos , Kolialexi Aggeliki , Destouni Aspasia , Tounta Georgia , Kanavakis Emmanuel , Antsaklis Aris , Mavrou Ariadni 
Published: March 2013

ABSTRACTObjectivesThis study aimed to quantitate cell free (cf) and cell free fetal (cff) DNA in maternal plasma by determining RASSF1A levels before and after enzyme digestion in women who subsequently developed preeclampsia (PE) and compare them with uncomplicated pregnancies.MethodsTwenty‐four samples from pregnant women who developed PE and 48 samples from women with uncomplicated pregnancies were analysed. Blood samples were obtained at 11–13 weeks. cfDNA was determined by quantifying RASSF1A using qRT‐PCR. A second qRT‐PCR was performed following methylation‐sensitive enzyme digestion by BstUI, to quantitate hypermethylated RASSF1A sequences of fetal origin. ACTB gene was used as control to confirm complete enzyme digestion.ResultscfDNA and cffDNA levels were significantly increased in women who developed PE as compared with uncomplicated pregnancies (median cfDNA: 9402 vs 2698, median cffDNA: 934.5 vs 62, respectively). Following operating characteristic curve analysis, cut‐off values of 7486 Εq/mL for cfDNA and 512 Εq/mL for cffDNA were chosen, which provided a sensitivity of 75% and 100% and specificity of 98% and 100%, respectively, to identify women at risk for PE.ConclusionsThe study demonstrates potential use of cfDNA and cffDNA in maternal plasma as markers for the early prediction of women at risk for PE. © 2013 John Wiley & Sons, Ltd.
Statins of high versus low cholesterol‐lowering efficacy and the development of severe renal failure
Authors: Chung Yu‐Heng , Lee Yen‐Chieh , Chang Chia‐Hsuin , Lin Min‐Shung , Lin Jou‐Wei , Lai Mei‐Shu 
Published: March 2013

ABSTRACTBackgroundThe objective of this nationwide retrospective cohort study was to examine the renal outcomes of HMG‐CoA reductase inhibitor (statin) initiators.MethodsThe patients who started to take statins with high cholesterol‐lowering efficacy (atorvastatin and rosuvastatin) and low efficacy (lovastatin, simvastatin, pravastatin, and fluvastatin) between 1 January 2001 and 31 December 2008 were identified from the Taiwan National Health Insurance claims database. The outcome of interest was severe renal failure, defined as the composite endpoint of hemodialysis, peritoneal dialysis, and kidney transplantation. A proportional hazard regression model was applied to estimate the incidence ratio between the two groups, adjusted for the propensity scores based upon baseline characteristics.ResultsAmong of the 26 007 and 42 249 statin initiators, the crude incidence rate for developing severe renal failure was 0.65 and 0.46 per 100 person‐years for the high‐efficacy and low‐efficacy groups, respectively. Despite that these two groups had comparable risk for myocardial infarction (hazard ratio: 1.06, 95%CI: 0.92–1.21), there was a 13% increased hazard for developing severe renal failure in the rosuvastatin and atorvastatin initiators (hazard ratio: 1.13, 95%CI: 1.02–1.26). The increased risk associated with these two statins was consistent across different risk groups (diabetes, chronic kidney disease, and ischemic heart disease).ConclusionsStatins with high cholesterol‐lowering efficacy might increase the risk for developing severe renal failure. An alternative explanation is that the renal risk cannot be ameliorated as much as cardiovascular risk. Further follow‐up studies or meta‐analyses are needed to solve the controversy. Copyright © 2013 John Wiley & Sons, Ltd.