bluuebunny/crossref_metadata_2025_split huggingface dataset:
An annular‐ring slot antenna for CP operation
Authors: Kumar Ajay , Gautam A. K. , Kanaujia Binod Kr. 
Published: March 2013

AbstractAn annular‐ring slot antenna with pair of slits and truncated corner for CP operation is proposed. A pair of slits and truncated corners are used to enhance axial ratio bandwidth. The proposed antenna is fabricated and simulated to analyze its radiation characteristics. Simulated results show a good agreement with experimental results. The antenna also shows much larger CP bandwidths than earlier reported results. The measured impedance bandwidth and 3‐dB axial ratio bandwidth (ARBW) of the proposed antenna are 94.2 and 73.8%, respectively. The proposed antenna shows consistent return loss and radian pattern for entire frequency band. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1418–1422, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27563
Wideband operations for compact single‐fed circularly polarized microstrip antenna
Authors: Wu Jianjun , Yang Xi , Yin Yingzeng , Xu Feng 
Published: March 2013

AbstractA compact single‐fed circularly polarized microstrip antenna is proposed for radio frequency identification readers.The antenna consists of a square patch with truncated corners printed a thick FR4 substrate and a probe‐fed metal strip that is adopted for wideband operations. Results show that the antenna achieves a 10‐dB return loss bandwidth of 11.02% (2.31–2.59 GHz) and a 3‐dB axial ratio (AR) bandwidth of 2.45% (2.42–2.48 GHz) or 6‐dB AR bandwidth of 4.9% (2.39–2.51 GHz). © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1254–1257, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27568
Analysis of stripline configurations loaded with complementary split ring resonators
Authors: Falcone Francisco , Illescas Jesús , Jarauta Eduardo , Estevez Aritz , Marcotegui Jose Antonio 
Published: March 2013

AbstractIn this article, a stripline planar transmission line loaded with complementary split ring resonators (CSRRs), in order to obtain a frequency selective behavior. Due to the quasi‐static resonance frequency of the CSRR elements, given by the excitation by normal incident E‐field, a rejected frequency band can be observed. Simulation as well as measurement results reveal the possibility to apply this type of configuration for the implementation of devices in stripline technology. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1250–1254, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27569
100 Gb/s long‐reach WDM‐PON implemented by using directly modulated RSOA
Authors: Tawade Laxman 
Published: March 2013

AbstractThis article presents long reach wavelength division multiplexing passive optical network (WDM‐PON) system capable of delivering 100 Gb/s data to each subscriber. For cost‐effectiveness, WDM‐PON is implemented in loopback configuration using directly modulated reflective semiconductor optical amplifiers (RSOAs) at 25 Gb/s. We use four RSOAs at each optical network unit for the 100‐Gb/s upstream transmission. The operating wavelengths of these RSOAs are separated by the free‐spectral range of the cyclic arrayed waveguide gratings used at the central office and remote node (RN) for (de)multiplexing the WDM channels. We extend the maximum reach of this WDM‐PON to 123 km by using Erbium‐doped fiber amplifiers at the RN. The results show that the error‐free transmission can be achieved for all WDM channels in the wavelength range of >35 nm with sufficient power margins. Bit error rate and Q‐factor were measured to demonstrate the proposed scheme. In this article, long reach and large data service aspects of an access network are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1426–1430, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27581 DOI 10.1002/mop.27572
A low profile, wideband cavity‐backed bowtie antenna
Authors: Zhou Shi‐Gang , Huang Guan‐Long , Chio Tan‐Huat 
Published: March 2013

AbstractIn this article, a cavity‐backed bowtie antenna (CBBA) is proposed and investigated.Compared with the conventional CBBA, parasitic stubs are added to the open‐end of the Bowtie. The parasitic stubs provide capacitive loading and allows the design to exhibit a low profile over a relatively wide bandwidth. Parametric studies are performed to optimize the antenna performance. For verification, a prototype was fabricated and measured. Experimental results show the VSWR of less than 2.0:1 from 1.97 to 8.5 GHz. However, the radiation pattern degrades beyond 7.5 GHz. This limits the operating bandwidth to about 117%. The height of the prototype is 15 mm which is only 0.1 λmax (λmax is the wavelength at the lowest operating frequency) © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1422–1426, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27573
Visible light based high accuracy indoor localization using the extinction ratio distributions of light signals
Authors: Yang Se‐Hoon , Kim Deok‐Rae , Kim Hyun‐Seung , Son Yong‐Hwan , Han Sang‐Kook 
Published: March 2013

AbstractIn this article, we propose an indoor location estimation algorithm that uses the signal extinction ratio distribution of LED‐based visible light communication.To improve the positioning accuracy, we use the received extinction ratio from different LED transmitters. In order to mitigate interference between transmitters, a location code was sent using time division multiplexing (TDM). We verified the feasibility of the proposed position estimation algorithm with an experimental demonstration. The proposed algorithm provided positioning accuracy with a 1.5787‐cm mean distance error for a given equilateral triangle cell with three 60‐cm sides. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1385–1389, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27575
A CMOS quadrature voltage‐controlled oscillators using common‐drain coupling transistors
Authors: Jang Sheng‐Lyang , Liu You‐Wei , Chang Chia‐Wei , Juang Miin‐Horng 
Published: March 2013

AbstractThis article presents a fully integrated quadrature cross‐coupled voltage controlled oscillator (QVCO) using common‐drain transistor instead of common‐source transistor as a coupling device.The prototype 3.8 GHz QVCO in 0.18 μm CMOS process is proposed to generate four output phases and it uses two p‐core cross‐coupled VCOs and nMOS coupling devices. The proposed QVCO oscillates from 3.6 to 3.84 GHz and the power consumption is 7.24 mW at 0.74 V supply voltage. The measured phase noise is –126.19 dBc/Hz at 1 MHz offset frequency from the carrier frequency 3.745 GHz. The VCO occupies a chip area of 1.08 ×0.924 mm2 and provides a figure of merit of –189.05 dBc/Hz. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1262–1266, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27578
A novel design of triple‐band monopole antenna for multi‐input multi‐output communication
Authors: Ojaroudi Nasser , Ojaroudi Mohammad 
Published: March 2013

AbstractIn this article, a novel wireless local area network (WLAN) frequency range monopole antenna is designed and manufactured for multi‐input multi‐output (MIMO) applications. The proposed antenna consists of two L‐shaped slots in the S‐shaped radiating patch. In this structure, the S‐shaped monopole antenna can create dual resonances within the WLAN range. Placement of two L‐shaped slots within the S‐shaped monopole antenna creates an extra resonance; the desired resonant frequencies are obtained by adjusting the dimension of the S‐shaped and the L‐shaped structures. The operating frequencies of the proposed antenna are 2.4/5.2/5.8 GHz, which covers WLAN system. Various configurations of array of this S‐shaped monopole antenna for MIMO application are also studied. Prototypes of the proposed antenna have been constructed and studied experimentally. Good return loss and radiation pattern characteristics are obtained in the frequency band of interest. Simulated and measured results are presented to validate the usefulness of this small proposed antenna structure for MIMO applications. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1258–1262, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27579
Highly linear microstrip wideband bandpass filter with switchable notched band for wireless applications
Authors: Rabbi K. , Athukorala L. , Panagamuwa C. , Vardaxoglou J. C. , Budimir D. 
Published: March 2013

AbstractThis article presents a highly linear reconfigurable bandpass filter embedded with a switchable notch structure to get a band‐notched characteristic at a specified frequency.A single PIN diode (BAP65‐02) is used for the purpose of switching the notch. An optical switch, comprised of a silicon dice activated using near infrared light is also investigated as an alternative to the PIN diode. While the PIN diode or the optical switch is in the ON state this reconfigurable filter behaves as a bandpass filter with a notch at 2.4 GHz in order to reject WLAN interference while a full band response is obtained in the OFF state. The proposed filter is able to achieve good linearity using PIN diode with IIP3 of 47 dBm and there is no significant loss. A prototype is fabricated, and measured results are compared to simulations. A good agreement has been achieved between simulated and measured results. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1331–1335, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27585
Compact dual‐band bandpass filter using spiral resonators and short‐circuited stub‐loaded resonator
Authors: Song Kaijun , Zhang Fan , Zhuge Chunlin , Fan Yong 
Published: March 2013

AbstractA compact dual‐band bandpass filter (BPF) using spiral resonators and short‐circuited stub‐loaded dual‐mode resonator is presented.Two different transmission paths and source‐load cross coupling are used to realize independently controllable bandwidths for each passband and good frequency selectivity. The coupling scheme and current distributions are applied to demonstrate the flexible design approach. A dual‐band BPF is designed, simulated, and fabricated to demonstrate the performance of the proposed dual‐band filter. The measured results show that the fabricated dual‐band BPF has two passbands centered at 2.45 and 3.55 GHz with the fractional bandwidths of 5 and 7%. The insertion loss is 1.2 and 1.3 dB at the lower and upper passbands, respectively, and the return loss within the two passbands is greater than 17 dB. The measured results show good agreement with the simulated ones. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1393–1398, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27589
A circularly polarized olympic‐like logo antenna for 900 MHZ UHF RFID reader
Authors: Sim Chow‐Yen‐Desmond , Chi Chin‐Jen 
Published: March 2013

AbstractThe design of a square‐shaped patch antenna loaded with an Olympic‐like logo slot for 900 MHz UHF RFID reader applications is studied.To achieve good circularly polarized (CP) radiation, an additional narrow perturbation slot is also loaded centrally across the logo. By further applying the L‐shaped probe‐fed method, desirable 3‐dB Axial Ratio (AR) and 10‐dB impedance bandwidth of 3.72% and 30%, respectively, can be achieved. From the experimental results, gain level and efficiency of more than 6 dBic and 89% were also measured, respectively. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1358–1360, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27591
Skin and Mucosa Care in Systemic Sclerosis – Patients' and Family Caregivers' Experiences and Expectations of a Specific Education Programme: A Qualitative Study
Authors: Kocher Agnes , Adler Sabine , Spichiger Elisabeth 
Published: March 2013

AbstractBackgroundSkin and mucosal manifestations such as skin thickening, pruritus, reduced microvascular circulation, digital lesions, appearance‐related changes, and dryness of the eyes and mucosa are common in systemic sclerosis (SSc). A specific skin and mucosa care education programme for patients and their family caregivers should increase their self‐efficacy and improve coping strategies.AimsThe aims of this qualitative study were to explore the participants' experiences of both everyday life with skin and mucosal manifestations and the programme itself, while identifying unmet needs for programme development.MethodsNarrative interviews were conducted with eight SSc patients and two family caregivers of individuals with SSc. Using qualitative content analysis techniques, the transcribed interviews were systematically summarized and categories inductively developed.ResultsThe findings illustrated participants' experiences of skin and mucosal symptoms and revealed them to be experts in finding the right therapy mix alone (before diagnosis) and also in collaboration with health professionals (after diagnosis). Participants emphasized that the programme gave them useful education on skin and mucosa care. They described how they had to cope alone with the lack of information on pathophysiology, people's reactions, and the impact on their family and working lives. Nevertheless, participants said that they maintained a positive attitude by not dwelling on future disabilities.ConclusionsPatients and family caregivers benefited from the individualized and SSc‐specific education on skin and mucosa care. Future improvements to the programme should focus on imparting understandable information on SSc pathophysiology, dealing with disfigurement and seeking reliable disease information, as well as facilitating peer support. Copyright © 2013 John Wiley & Sons, Ltd.
Changes in cardiovascular disease risk factors from age 9 to 19 and the influence of television viewing
Authors: Mitchell Jonathan A. , Pate Russell R. , Liese Angela D. 
Published: March 2013

AbstractObjective:The purpose of this study was to determine if time spent watching television is associated with changes in cardiovascular disease (CVD) risk factors from age 9 to 19.Design and Methods:Participants were girls enrolled in the NHLBI Growth and Health Study (n = 1,702), and CVD risk factors were measured at ages 10, 12, 14, 16, and 19. Longitudinal quantile regression was used to determine if television viewing was associated with changes in CVD risk factors over time at the 10th, 25th, 50th, 75th, and 90th percentiles of the CVD risk factors.Results:In black girls, television viewing (h/wk) was positively associated with sum of skinfolds (mm) at the 75th (0.22, 99% CI, 0.06‐0.38) and 90th percentiles (0.21, 99% CI, 0.05‐0.36), but not at the 10th, 25th, or 50th percentiles. In white girls, television viewing (h/wk) was positively associated with sum of skinfolds (mm) with the strength of the associations progressively stronger toward the upper tail of the skinfold distribution, adjusting for physical activity and other covariates (10th percentile: 0.08, 99% CI, 0.03‐0.13; 90th percentile: 0.42, 99% CI, 0.24‐0.59). All associations were adjusted for physical activity, dietary factors, sleep, and maturation. No associations were observed between television viewing and changes in systolic blood pressure, triglycerides, or cholesterol levels in black or white girls.Conclusion:Girls who spent more time watching television had greater increases in sum of skinfolds from age 9 to 19, independent of physical activity levels and other covariates. The associations observed were stronger at the upper tail of the skinfold distribution.
Effects of taspoglutide on glycemic control and body weight in obese patients with type 2 diabetes (T‐emerge 7 study)
Authors: Hollander Priscilla , Lasko Ben , Barnett Anthony H. , Bengus Monica , Kanitra Linda , Pi‐Sunyer F. Xavier , Balena Raffaella 
Published: March 2013

AbstractObjective:Therapies that lower blood glucose and provide weight loss may provide meaningful benefits for obese patients with type 2 diabetes mellitus (T2DM). This study assessed the efficacy of taspoglutide compared with placebo on glycemic control and weight in obese patients with T2DM inadequately controlled with metformin monotherapy.Design and Methods:In a 24‐week, randomized, double‐blind, placebo‐controlled, multicenter trial, obese adults with T2DM were randomized (1:1) to weekly subcutaneous taspoglutide 20 mg (10 mg for first 4 weeks) (n = 154) or placebo (n = 151) for 24 weeks. Efficacy measures included hemoglobin A1c (HbA1c) levels, body weight, percentage of patients achieving HbA1c ≤6.5 and ≤7.0%, and fasting plasma glucose (FPG). Adverse events (AEs) were assessed.Results:Mean baseline HbA1c was 7.55% and mean baseline BMI was 36.7 kg/m2. HbA1c reductions from baseline were significantly greater with taspoglutide than placebo (least square mean [LSMean], −0.81% vs. −0.09%; P < 0.0001). Weight loss at week 24 was significantly greater with taspoglutide than placebo (LSMean, −3.16 vs. −1.85 kg; P < 0.01). In the taspoglutide and placebo groups, target HbA1c levels (≤6.5%) were achieved by 49 and 16% of patients, respectively, while 72 and 36% achieved HbA1c levels ≤7%. Decreases in FPG were significantly greater with taspoglutide than placebo (−23.59 vs. 0.09 mg/dl; P < 0.0001). Nausea and vomiting were the most common AEs associated with taspoglutide, but tended to be transient and generally mild or moderate.Conclusions:In obese patients with T2DM, once‐weekly taspoglutide provided the combined benefits of glycemic control and weight loss.
The relationship between anthropometric indexes of adiposity and vascular function in the FATE cohort
Authors: Martin Billie‐Jean , Verma Subodh , Charbonneau Francois , Title Lawrence M. , Lonn Eva M. , Anderson Todd J. 
Published: March 2013

AbstractObjective:Numerous indexes of adiposity have been proposed and are currently in use in clinical practice and research. However, the correlation of these indexes with measures of vascular health remain poorly defined. This study investigated which measure of adiposity is most strongly associated with endothelial function.Design and Methods:Data from the Firefighters And Their Endothelium (FATE) study was used. The relationships between three measures of vascular function: flow‐mediated dilation (FMD), hyperemic velocity time integral (VTI), and hyperemic shear stress (HSS), and five measures of adiposity: BMI, waist circumference (WC), waist‐to‐hip ratio (WHR), waist‐to‐height ratio (WHtR), and body adiposity index (BAI) were tested. Univariate comparisons were made, and subsequently models adjusted for traditional risk factors were constructed.Results:A total of 1,462 male firefighters (mean age 49 ± 9) without cardiovascular disease comprised the study population. No measure of adiposity correlated with FMD; all five measures of adiposity were negatively correlated with VTI and HSS (P values <0.0001), with WHtR most strongly correlated with VTI, and WC most strongly correlated with HSS (both P < 0.05). In models including all five measures of obesity simultaneously, BMI, WC, and WHtR were all predictive of HSS (all P values <0.05), and BMI and WHR were both predictive of VTI (P values <0.05).Conclusions:Anthropometric measures of adiposity may help refine estimations of atherosclerotic burden. BMI was most consistently associated with endothelial dysfunction, but measures of adiposity that reflect distribution of mass were additive.
Structures and properties of thermoregulated acrylonitrile–methyl acrylate sheet containing microphase change materials
Authors: Han Na , Gao Xiyin , Zhang Rong , Zhang Xingxiang 
Published: March 2013

AbstractA series of melt processable poly(acrylonitrile–methyl acrylate) copolymers with a feeding ratio of 85/15 mol% (abbreviated as 85/15 AN/MA below) containing 0–25 wt% of microencapsulated phase change materials (micro‐PCMs) were synthesized by aqueous precipitation polymerization. The number average sequence lengths (NASLs) and tacticity of 85/15 AN/MA were determined using 13C‐NMR. The results showed that the NASL of contiguous AN sequences is 10.00 and the tacticity is atactic with approximately 51% m and 49% r diads (the relative orientation of two adjacent cyanogroup). 85/15 AN/MA containing various contents of micro‐PCMs were processed into sheets in melt condition at 210°C and 20 MPa. The structures and properties of the copolymers and sheets containing micro‐PCMs were studied by using Fourier transform infrared spectroscopy, nuclear magnetic resonance (1H‐NMR), scanning electron microscopy, differential scanning calorimetry, gel permeation chromatography, X‐ray diffraction, and dynamic mechanical analysis. The composition of AN/MA copolymer agreed well with its monomer feed ratio. The melting enthalpy of the sheets containing 25 wt% of micro‐PCMs was approximately 25 J/g, which increased steadily as the micro‐PCMs content increased. The modulus of the sheets decreased with the micro‐PCMs content increased. The glass transition temperature (Tg) of the sheets was in the range of 79.7–81.7°C, which also increased with the micro‐PCMs content increasing. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers
Mechanical, thermal and degradation properties of jute fabric – reinforced polypropylene composites: Effect of potassium permanganate as oxidizing agent
Authors: Khan Jahangir A. , Khan Mubarak A. , Islam Rabiul 
Published: March 2013

AbstractMechanical properties of jute fabrics‐reinforced polypropylene composites were measured with reference to fiber loading and found highest at 45% by the weight of jute fabrics. Jute fabrics were treated with potassium permanganate in acid (oxalic acid and sulphuric acid) and alkaline (KOH) media in order to investigate the oxidizing effect on the properties of the composites. Solutions of oxalic acid, sulphuric acid, and KOH were prepared in water as 1.0–10.0% w/v, 0.1–2.0% v/v, and 1.0–10.0% w/v, respectively, where percentage of KMnO4 was maintained at 0.01% w/v. Among the treatments, 5.0% oxalic acid treated jute composite showed better mechanical performance. Thermogravimetric (TG/DTG) data of PP, jute fabrics and composites showed that thermal degradation temperatures of composites shifted to higher temperature regions compared to PP or jute fabrics. The treatment of jute fabrics improves thermal stability of the composites. Treated jute composites were found less degradable in soil, water and simulated weathering conditions and also found less water sensible compared to control composite (45% w/w jute fabrics). POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers
Characterization and anticorrosive properties of poly(2,3‐dimethylaniline)/TiO2 composite synthesized by emulsion polymerization
Authors: Li Zhitao , Ma Li , Gan Mengyu , Yan Jun , Hu Haifeng , Zeng Jun , Chen Feifei 
Published: March 2013

AbstractPoly(2,3‐dimethylaniline)/TiO2 composite (PTC) was prepared by emulsion polymerization using dodecyl benzene sulfonic acid as emulsifier and dopant. The structure of PTC was characterized by Fourier transformation infrared spectroscopy, wide‐angle X‐ray diffraction, and field emission scanning electron microscopy. Effect of TiO2 content on the PTC properties was studied by tafel polarization curves, electrochemical impedance spectroscopy, polymerization yield, and cyclic voltammetry measurements. The results showed that the anticorrosion property and electrochemical activity of PTC reached a maximum level when the content of TiO2 was 15%. Epoxy coatings containing poly(2,3‐dimethylaniline) (P(2,3‐DMA)) and PTC, respectively, were painted on steel and accelerated electrochemical corrosion tests were performed to evaluate the anticorrosion property of the coatings in 3.5% NaCl solution. The results showed that the PTC coating had higher corrosion resistance than that of P(2,3‐DMA). POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers