bluuebunny/crossref_metadata_2025_split huggingface dataset:
Compact LTCC dual‐band bandpass filter with high selectivity using the vertically S‐shaped short‐ended SIR
Authors: Chen Jian‐Xin , Ge Yong , Tang Hui , Zhou Li‐Heng , Shi Jin , Bao Zhi‐Hua 
Published: March 2013

AbstractFor the first time, a vertically S‐shaped short‐ended stepped‐impedance resonator (SIR) is proposed to design a compact low temperature co‐fired ceramic (LTCC) dual‐band bandpass filter (BPF).The proposed SIR as a transmission line resonator can be used in high‐frequency application, and the size of the SIR can be miniaturized greatly because it is vertically folded in LTCC. Three transmission zeros in the stopbands are achieved by using the electric and magnetic mixed coupling schemes. The demonstrated dual‐band BPF at 5.8/10 GHz is designed and fabricated. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1345–1348, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27539
Design of ultra‐wide stop‐band DGS low‐pass filter using meander‐ and multilayer‐techniques
Authors: Sharkawy M. Al , Boutejdar A. , Galal E. 
Published: March 2013

AbstractThis article presents a new dog‐bone defected ground structure (DGS) for low‐pass filter (LPF) applications with wide‐rejection band and low‐insertion loss in the pass‐band region.The prototype LPF consists of three dog‐bone cells in the ground plane with an open stub on the top layer acting as a compensated capacitor. The prototype LPF is then realized as a multilayer structure to enhance the filter response and reduce its size. The size reduction of the proposed multilayer LPF is about 34% more than the conventional one. The proposed filter has been fabricated and measured. Good agreement can be realized between the electromagnetic simulation and the measurement results. To minimize the difference between the simulation and measurement results, and at the same time to reduce the loss in the pass‐band region, a modification to the topology of the structure with the aid of the meander idea is used. The meander‐filter presents advantages of compactness, low insertion loss, and high out‐band suppression. The dog‐bone DGS cell is then used as a photonic band gap structure to minimize the coupling between two probe‐fed patch antennas and to improve the two antenna element array efficiency. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1276–1281, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27541
A novel dual‐band asymmetric slit with defected ground structure microstrip antenna for Circular Polarization operation
Authors: Gautam A. K. , Kr Kanaujia Binod 
Published: March 2013

AbstractA novel dual‐band asymmetric slit with defected ground structure microstrip antenna for circular polarization (CP) operation is proposed. In which, the lower resonant band is excited by cutting asymmetric slit on square microstrip antenna, and a new concept of defected ground with truncated corners structure is used to excite upper resonant band. The antenna is practically fabricated and simulated. Measured results show a good agreement with simulated results. Antenna is compact in size and shows a good quality of polarization at both resonant bands. Antenna shows the bandwidth of 7.5% (2.30–2.48 GHz) and 2.94% (3.80–3.9 GHz) at lower and upper bands, respectively. The antenna also shows 40 and 11 MHz, 3‐dB axial ratio bandwidth at lower and upper bands, respectively. The return loss and radiation pattern of the proposed antenna remain consistent for both resonant bands. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1198–1201, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27547
The on‐line measurement of dimethoate solution's degradation based on a long‐period grating
Authors: Hu Xingliu , Liang Dakai , Fang Ting , Wang Yan , Li Dan 
Published: March 2013

AbstractA long‐period grating is used to detect the degradation of dimethoate solutions which is achieved by the electrocoagulation technology combined with ultrasonic waves in this article. This fiber‐based device can indicate the concentration of dimethoate solutions instantaneously without being sampled. It can be applied in the chemistry industry for process control. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1375–1379, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27554
Investigation of truncated waveguides
Authors: Lourie Nathan P. , Chuss David T. , Henry Ross M. , Wollack Edward J. 
Published: March 2013

AbstractThe design, fabrication, and performance of truncated circular and square waveguide cross‐sections are presented. An emphasis is placed upon numerical and experimental validation of simple analytical formulae that describe the propagation properties of these structures. A test component, a 90‐degree phase shifter, was fabricated and tested at 30 GHz. The concepts explored can be directly applied in the design, synthesis and optimization of components in the microwave to submillimeter wavebands. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1281–1285, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27561
Effective dielectric constant of top grounded coplanar waveguide on liquid crystal superstrate
Authors: Bulja Senad , Mirshekar‐Syahkal Dariush , James Richard , Day Sally E. , Fernández F.Aníbal 
Published: March 2013

AbstractThe effective dielectric constant of the top grounded coplanar waveguide with a liquid crystal (LC) superstrate for phase shifting applications is investigated in the frequency range of 30–60 GHz. Two nematic LC mixtures, namely E7 and MDA‐00‐3506, are used as the superstrate. The measurements show that MDA‐00‐3506 offers higher values of phase shift per millimeter than its E7 counterpart. In particular, the MDA‐00‐3506 provides 3.14°/mm, whereas E7 gives 2.79°/mm at 60 GHz. The results of the dielectric constants from measurement and computer modeling are found to agree to within 5%. For the modeling, a comprehensive finite element package predicting the local alignment of LC molecules and effective dielectric constant at different bias voltages and frequencies are used. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1416–1418, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27564
Studies on the orientation of radiators For high‐gain line‐fed array antenna
Authors: Kahar Manisha , Ray Arup , Sarkar P. P 
Published: March 2013

AbstractTwo antenna systems, each consisting of two microstrip line‐fed monopole antenna elements, differing in element geometry have been designed, investigated, and optimized for favorable antenna characteristics including the properties of ultra wide band, omnidirectional radiation characteristics, and high gain. Interestingly most parameters of credit were alike in the two designs except for the antenna gain which was remarkable high in the second design compared to the first one. The cause of difference has also been considered. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1348–1351, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27567
Comparison of different structures for transmitarray cells
Authors: Plaza Enrique G. , Loredo Susana , León Germán , Las‐Heras Fernando 
Published: March 2013

AbstractThis paper presents the comparison between two different transmitarray cells, one based on stacked slots and the other on aperture coupled patches. Both structures can achieve a phase shift of up to 360° keeping a reasonable level of transmission. Since the patches cell showed more stability with the incident angle, it was chosen to be fabricated and measured in a waveguide simulator. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1295–1299, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27577
Calculating the dual‐frequencies of equilateral triangular compact microstrip antennas with a shorting‐pin
Authors: Toktas Abdurrahim , Akdagli Ali , Yagoub Mustapha C. E. 
Published: March 2013

AbstractIn this article, simple but efficient expressions for determining the dual‐frequencies of equilateral triangular compact microstrip antennas (ETCMA) with a shorting‐pin are presented. Two expressions related to offset factor functions were derived with the use of a differential evolution optimization algorithm. The dual‐frequencies of an ETCMA with a shorting‐pin were then calculated by multiplying the offset factor functions with the single resonant frequency formulation of a conventional equilateral triangular microstrip antenna. The proposed approach was demonstrated through successful comparison with simulated and measured data. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1227–1230, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27580
Design of a new ultra wideband planar antenna for wireless communication systems
Authors: Bassouh M. , Aznabet M. , Meloui M. , Mrabet O. El , Falcone F. , Khalladi M. 
Published: March 2013

AbstractA new planar circular monopole antenna for ultra wideband (UWB) applications is presented. To achieve UWB characteristics, the proposed antenna is constructed by embedding the slot on the partial ground plane. The proposed antenna has been successfully simulated and measured. Experimental results indicate that the proposed antenna yields an impedance bandwidth of 2.3 up to 13 GHz with VSWR < 2, which makes it suitable to operate not only for UWB bandwidth but also it can be used also for WLAN application. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1335–1338, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27584
Compact and wideband 180° hybrid using vertically coupled CPW balun with lumped elements
Authors: Wei Kai , Lee Moon‐Que 
Published: March 2013

AbstractA new compact and wideband 180° hybrid is proposed. The proposed structure stems from the idea of converting a balun into a 180° hybrid by adding an in‐phase power divider. In order to achieve wide bandwidth and miniaturized size, a lumped power divider and a vertically coupled CPW balun with lumped elements are used. For verification, the proposed 180° hybrid is designed at 917 MHz. The measurement shows that the bandwidth of CMRR greater than 25 dB is increased by 84 % compared with that of the conventional ring hybrid. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1328–1331, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27592
A pattern reconfigurable patch antenna using switched loop structure
Authors: Kim Yongjin 
Published: March 2013

AbstractA pattern reconfigurable patch antenna using a switched loop structure is presented.The loop structure for switchable radiation pattern is connected with a feeding line of the patch antenna. The proposed antenna is designed to operate at 2.5 GHz band with 4.2 dBi maximum gain for wireless communication. The sizes of the rectangular patch and the ground plane are 28 mm × 28 mm and 50 mm × 60 mm, respectively. The simulation and experimental results show that the antenna radiation pattern can be changed with switch on/off configuration. The average gain value in the switch off case is 4.09 dB less than that of the switch on case over the range of from 30 to 150°. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1325–1328, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27593
Does a lesion in Broca's area cause apraxia?
Authors: Tsuruya Natsuko , Kobayakawa Mutsutaka , Futamura Akinori , Sugimoto Azusa , Kawamura Mitsuru 
Published: March 2013

AbstractBackground and AimBroca's area, which comprises the inferior frontal gyrus and its surrounding regions, is associated with language function. Recent functional imaging studies showed that it is also related to processing goal‐directed actions.This study aimed to determine the types of action disorders that occur after damage to Broca's area.MethodsHere, we report four patients with left inferior frontal lesions that included Broca's area. The patients did not exhibit severe language comprehension impairment or paralysis that affected the apraxia testing. The patients were asked to perform intransitive gestures in response to verbal commands, imitate intransitive gestures, perform transitive gestures in response to verbal commands, perform transitive gestures in response to visual objects, imitate transitive gestures, and use tools.ResultsAll patients exhibited impaired gestures in response to verbal commands, while the performances regarding imitation and actual tool use were better. An error pattern analysis showed that the patients predominantly made spatial action errors. This pattern corresponds to the classical definitions of ideomotor apraxia.ConclusionThese results indicate that Broca's area mediates action production and that a lesion in this area can cause ideomotor apraxia. Although we should be cautious about the influence of aphasia, we believe that the comprehension deficit observed in our patients cannot account for their apraxic syndromes. Because the deficit was seen mainly for verbal commands, damage in Broca's area may have disrupted the association between verbal and action domains.
S‐Glutathionylation of hepatic and visceral adipose proteins decreases in obese rats
Authors: Picklo Matthew J. , Idso Joseph P. , Jackson Matthew I. 
Published: March 2013

AbstractA number of clinical and biochemical studies demonstrate that obesity and insulin resistance are associated with increases in oxidative stress and inflammation. Paradoxically, insulin sensitivity can be enhanced by oxidative inactivation of cysteine residues of phosphatases, and inflammation can be reduced byS‐glutathionylation with formation of protein‐glutathione mixed disulfides (PSSG). Although oxidation of protein‐bound thiols (PSH) is increased in multiple diseases, it is not known whether there are changes in PSH oxidation species in obesity.Objective:In this work, the hypothesis that obesity is associated with decreased levels of proteins containing oxidized protein thiols was tested.Design and Methods:The tissue levels of protein sulfenic acids (PSOH) and PSSG in liver, visceral adipose tissue, and skeletal muscle derived from glucose intolerant, obese‐prone Sprague‐Dawley rats were examined.Results:The data in this study indicate that decreases in PSSG content occurred in liver (44%) and adipose (26%) but not skeletal muscle in obese rats that were fed a 45% fat‐calorie diet versus lean rats that were fed a 10% fat‐calorie diet. PSOH content did not change in the tissue between the two groups. The activity of the enzyme glutaredoxin (GLRX) responsible for reversal of PSSG formation did not change in muscle and liver between the two groups. However, levels of GLRX1 were elevated 70% in the adipose tissue of the obese, 45% fat calorie‐fed rats.Conclusion:These are the first data to link changes inS‐glutathionylation and GLRX1 to adipose tissue in the obese and demonstrate that redox changes in thiol status occur in adipose tissue as a result of obesity.
XOMA 052, an anti‐IL‐1β monoclonal antibody, prevents IL‐1β‐mediated insulin resistance in 3T3‐L1 adipocytes
Authors: Handa Masahisa , Vanegas Sandra , Maddux Betty A. , Mendoza Nerissa , Zhu Shirley , Goldfine Ira D. , Mirza Amer M. 
Published: March 2013

AbstractObjective:Interleukin‐1β (IL‐1β) has recently been implicated as a major cytokine that is involved in the pancreatic islet inflammation of type 2 diabetes mellitus. This inflammation impairs insulin secretion by inducing beta‐cell apoptosis. Recent evidence has suggested that in obesity‐induced inflammation, IL‐1β plays a key role in causing insulin resistance in peripheral tissues.Design and Methods:To further investigate the pathophysiological role of IL‐1β in causing insulin resistance, the inhibitory effects of IL‐1β on several insulin‐dependent metabolic processes in vitro has been neutralized by XOMA 052. The role IL‐1β plays in insulin resistance in adipose tissue was assessed using differentiated 3T3‐L1 adipocytes and several parameters involved in insulin signaling and lipid metabolism were examined.Results and Conclusion:IL‐1β inhibited insulin‐induced activation of Akt phosphorylation, glucose transport, and fatty acid uptake. IL‐1β also blocked insulin‐mediated downregulation of suppressor of cytokine signaling‐3 expression. Co‐preincubation of IL‐1β with XOMA 052 neutralized nearly all of these inhibitory effects in 3T3‐L1 adipocytes. These studies provide evidence, therefore, that IL‐1β is a key proinflammatory cytokine that is involved in inducing insulin resistance. These studies also suggest that the monoclonal antibody XOMA 052 may be a possible therapeutic to effectively neutralize cytokine‐mediated insulin resistance in adipose tissue.
Objectively measured sedentary behavior, physical activity, and plasma lipids in overweight and obese children
Authors: Cliff Dylan P. , Okely Anthony D. , Burrows Tracy L. , Jones Rachel A. , Morgan Philip J. , Collins Clare E. , Baur Louise A. 
Published: March 2013

AbstractObjective:This study examines the associations between objectively measured sedentary behavior, light physical activity (LPA), and moderate‐to‐vigorous physical activity (MVPA), and plasma lipids in overweight and obese children.Design and Methods:Cross‐sectional analyses were conducted among 126 children aged 5.5‐9.9 years. Sedentary behavior, LPA, and MVPA were assessed using accelerometry. Fasting blood samples were analyzed for plasma lipids (high‐density lipoprotein cholesterol [HDL‐C], low‐density lipoprotein cholesterol [LDL‐C], total cholesterol [TC], and triglycerides [TG]).Results:MVPA was not related to plasma lipids (P > 0.05). Independent of age, sex, energy intake, and waist circumference z‐score, sedentary behavior and LPA were associated with HDL‐C (β = −0.23, 95% CI −0.42 to −0.04, P = 0.020; β = 0.20, 95% CI 0.14 to 0.39, P = 0.036, respectively). The strength of the associations remained after additionally adjusting for MVPA (sedentary behavior: β = −0.22, 95% CI −0.44 to 0.006, P = 0.056; LPA: β = 0.19, 95% CI −0.005 to 0.38, P = 0.056, respectively).Conclusion:Substituting at least LPA for sedentary time may contribute to the development of healthy HDL‐C levels among overweight and obese children, independent of their adiposity. Comprehensive prevention and treatment strategies to improve plasma HDL‐C among overweight and obese children should target reductions in total sedentary time and promote the benefits of LPA, in addition to promoting healthy levels of adiposity, healthy dietary behaviors, and MVPA.
Adipose tissue‐specific modulation of galectin expression in lean and obese mice: Evidence for regulatory function
Authors: Rhodes Davina H. , Pini Maria , Castellanos Karla J. , Montero‐Melendez Trinidad , Cooper Dianne , Perretti Mauro , Fantuzzi Giamila 
Published: March 2013

AbstractObjective:Galectins (Gal) exert many activities, including regulation of inflammation and adipogenesis. We evaluated modulation of Gal‐1, ‐3, ‐9 and ‐12 in visceral (VAT) and subcutaneous (SAT) adipose tissue in mice.Design and Methods:We used two mouse models of obesity, high‐fat diet induced obesity (DIO) and ob/ob mice. We also evaluated the response of Gal‐1 KO mice to DIO.Results:Both age and diet modulated expression of galectins, with DIO mice having higher serum Gal‐1 and Gal‐3 versus lean mice after 13‐17 weeks of high‐fat diet. In DIO mice there was a progressive increase in expression of Gal‐1 and Gal‐9 in SAT, whereas Gal‐3 increased in both VAT and SAT. Expression of Gal‐12 declined over time in VAT of DIO mice, similar to adiponectin. Obesity lead to increased production of Gal‐1 in adipocytes, whereas the increased Gal‐3 and Gal‐9 of obesity mostly derived from the stromovascular fraction. Expression of Gal‐12 was restricted to adipocytes. There was increased production of Gal‐3 and Gal‐9, but not Gal‐1, in CD11c− and CD11c+ macrophages from VAT of DIO versus lean mice. Expression of Gal‐1, ‐3 and ‐12 in VAT and SAT of ob/ob mice followed a trend comparable to DIO mice. Rosiglitazone reduced serum Gal‐1, but not Gal‐3 and modulated expression of Gal‐3 in VAT and Gal‐9 and Gal‐12 in SAT of DIO mice. High‐fat feeding lead to increased adiposity in Gal‐1 KO versus WT mice, with loss of correlation between leptin and adiposity and no alterations in glucose and insulin levels.Conclusions:Obesity leads to differential modulation of Gal‐1, 3, 9 and 12 in VAT and SAT, with Gal‐1 acting as a modulator of adiposity.
Turning the analysis of obesity–mortality associations upside down: Modeling years of life lost through conditional distributions
Authors: Robertson Henry T. , Campos Gustavo de los , Allison David B. 
Published: March 2013

AbstractObjective:We demonstrate the utility of parametric survival analysis. The analysis of longevity as a function of risk factors such as body mass index (BMI; kg/m2), activity levels, and dietary factors is a mainstay of obesity research. Modeling survival through hazard functions, relative risks, or odds of dying with methods such as Cox proportional hazards or logistic regression are the most common approaches and have many advantages. However, they also have disadvantages in terms of the ease of interpretability, especially for non‐statisticians; the need for additional data to convert parameter estimates to estimates of years of life lost (YLL); debates about the appropriate time scale in the model; and an inability to estimate median survival time when the censoring rate is too high.Design and Methods:We will conduct parametric survival analyses with multiple distributions, including distributions that are known to be poor fits (Gaussian), as well as a newly discovered “Compressed Gaussian”'' distribution.Results:Parametric survival analysis models were able to accurately estimate median survival times in a population‐based data set of 15,703 individuals, even for distributions that were not good fits and the censoring rate was high, due to the central limit theorem.Conclusions:Parametric survival models are able to provide more direct answers, and in our analysis of an obesity‐related data set, gave consistent YLL estimates regardless of the distribution used. We recommend increased consideration of parametric survival models in chronic disease and risk factor epidemiology.