bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel dual‐band metamaterial antenna based on complementary split ring resonators
Authors: Xie Yi Hong , Zhu Cheng , Li Long , Liang Chang Hong 
Published: February 2012

AbstractA novel dual‐band microstrip patch antenna based on complementary split ring resonators (CSRRs) is proposed and analyzed.By etching two CSRRs on the ground plane of a conventional patch antenna, the proposed dual‐band metamaterial antenna can be easily realized. The proposed antenna shows good performances at both resonant frequencies. The CSRRs embedded make a major contribution to the first operating band, but have a minor effect on the second operating band which is originated by the patch. Good shape patterns are achieved at each operating frequecy region and the experimental results correspond well with simulated results. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1007–1009, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26715
Design and fabrication of novel microlens–micromirrors array for infrared focal plane array
Authors: Jian‐Hua Yan , Wen Ou , Yi Ou , Li‐Jun Zhao 
Published: February 2012

AbstractA simple method on fabricating a novel structure of microlens–micromirrors array (MMA) with 100% fill factor and smooth surface profile is presented. The MMA has a special structure, which has a microlens array with foot diameter of 35 μm on the upper layer and a micromirrors array with top width of 50 μm and bottom width of 30 μm on the lower layer. These two arrays are connected by a thin layer of silicon. The new structure has potential to integrate with infrared focal plane arrays (IRFPAs). An analytical optical model is established and experimentally verified; results show that all of the incident infrared lights within a certain range can be absorbed by the photosensitive surface of IRFPAs with this structure. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:879–884, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26722
Multimode interference in outer cladding large‐core, air‐clad photonic crystal fiber
Authors: Coelho Luís , Kobelke Jens , Schuster Kay , Frazão Orlando 
Published: February 2012

AbstractIt is described a large‐core air‐clad photonic crystal fiber‐based sensing structure using the outer cladding as a light guide, which is highly sensitive to refractive index. The sensing head is based on multimodal interference, and relies on a single mode/large‐core air‐clad photonic crystal fiber/single mode fiber configuration. Using this configuration and controlling the light to travel in a segment of the outer cladding multimode fiber, it was possible to implement a sensing head and the results were obtained independently from variations of temperature, strain and refractive index. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1009–1011, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26726
Dual‐band printed dipole antenna loaded with open complementary split‐ring resonators for wireless applications
Authors: Herraiz‐Martínez Francisco Javier , Paredes Ferran , Zamora Gerard , Martín Ferran , Bonache Jordi 
Published: February 2012

AbstractIn this article, a printed dipole antenna loaded with open complementary split ring resonators is proposed. The integration of these particles inside the dipole structure provides dual‐band behavior. Furthermore, a dipolar‐like radiation pattern is obtained at both working frequency bands. A prototype has been designed for operation in the L1‐GPS frequency (1.575 GHz) and the WiFi band of 2.4–2.48 GHz. The prototype has been fabricated and measured, achieving good results. The obtained results show the suitability of the proposed design for dual‐band wireless terminals. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1014–1017, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26728
A new technique for efficient and accurate analysis of FSSs, EBGs and metamaterials
Authors: Mittra Raj , Pelletti Chiara , Tsitsas Nikolaos L. , Bianconi Giacomo 
Published: February 2012

AbstractThe article presents a numerically efficient and accurate technique for the analysis of doubly‐infinite periodic arrays, which find applications as frequency selective surfaces, electronic bandgap structures and metamaterials that often utilize periodic elements with fine features. The method derives its efficiency by projecting the solution to the infinite array problem from that of a corresponding truncated array of relatively small size, typically comprising of only four to six rings. Furthermore, it reduces the matrix size needed to solve for the induced current to only two or three. Another feature of the method is that it involves reciprocity principle to compute the reflection and transmission coefficients of the array, using a technique that avoids the need to integrate the currents induced on the unit cell via the periodic Green's function, as well as the evaluation of the latter integral in the far‐field. The results derived are compared with commercial software tools to assess the validity of the approach and to demonstrate the time advantage of the present scheme over the existing techniques. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1108–1116, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26730
Compact self‐similar triple‐band antenna for WLAN/WiMAX applications
Authors: Liu W. X. , Yin Y.Z. , Xu W. L. 
Published: February 2012

AbstractA compact triple‐band antenna for wireless local area network/worldwide interoperation for microwave access (WLAN/WiMAX) applications is presented. The proposed antenna can generate three operating bands to cover 2.4/5.2/5.8 GHz for WLAN system and 2.5/3.5/5.5 GHz for WiMAX system using double self‐similar coupled ring elements. Measured results show that the proposed antenna has good omnidirectional radiation characteristics and enough gain across the operation bands retaining a compact size (25 × 38 mm2) and a simple structure. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1084–1087, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26732
Fiber bending sensor based on a two mode fiber
Authors: Chen Daru , Xu Fei , Hu Gufeng , Chen Lingxia , Peng Baojin 
Published: February 2012

AbstractA fiber bending sensor by splicing a segment of two mode fiber to the single mode fiber is proposed.The two mode fiber with an external diameter (fiber core diameter) of 145 μm (17.65 μm) can only support the fundamental mode (LP01 mode) and the second mode (LP11 mode), which results in an interfering spectrum of the fiber bending sensor. The interfering spectrum has an extinction ratio of about 10 dB in 1.55 μm window, and the fiber bending curvature is measured corresponding to the shift of the interfering spectrum. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1047–1049, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26734
UWB monopole antenna with circular polarization
Authors: Rahim Sharul Abdul , Danesh Sh. , Okonkwo Uche Anicetus , Sabran Mursyidul , Khalily Mohsen 
Published: February 2012

AbstractIn this article, ultra‐wideband (UWB) monopole antenna with circular polarization (CP) is designed and implemented. The proposed antenna consists of an asymmetric shaped radiator fed by a microstrip line and a limited ground plane on the back side of the substrate. The overall size of proposed antenna is 28 mm × 29 mm, which is suitable for mobile devices. The antenna is fabricated on inexpensive FR4 a dielectric constant of, loss tangent tan δ = 0.019 with thickness of 1.6‐mm. The measured results show that the proposed monopole antenna has a very wide bandwidth from 2.98 to 10.93 GHz that covers the UWB application range and defined by 10‐dB return loss. Furthermore, a very wide CP bandwidth of 3‐dB axial ratio bandwidth that ranges from 7.18 to 10.01 GHz is achieved. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:949–953, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26741
A fast design approach of compact microstrip multiband bandpass filters
Authors: Hejazi Zuhair M. 
Published: February 2012

AbstractA simplified technique is used to design multiband bandpass filters using a compact ultrawideband (UWB) microstrip bandpass filter with spiral‐shaped λg/2 resonators, spaced apart by λg/4.Pairs of transmission zeros are generated on predefined locations in the UWB to create dual‐, triple‐, or quad‐band bandpass filters, as desired. The bandwidth and location of the sub‐bands can be easily controlled by the locations of the transmission zeros. These are generated by inserting additional resonators with predicted lengths. Highly selective quasielliptic multiband controllable responses can be achieved. Equations for fast calculations of filter dimensions are derived. Measurements show excellent agreement with the simulations. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1075–1079, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26742
A compact square microstrip antenna for circular polarization
Authors: Gautam A. K. , Benjwal Pramod , Kanaujia B.K. 
Published: February 2012

AbstractA compact square microstrip antenna with four slits and a pair of truncated corner for circular polarization is proposed. Theoretical modal for an antenna is developed using modal cavity model and result are validated with MOM‐based simulator and earlier reported experimental results. A good agreement between the simulated, theoretical model and measured results is obtained. The proposed antenna shows about 39% reduction in antenna size as compared with the conventional circular polarized antenna. Antenna shows consistent return loss and radiation pattern for entire frequency range. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:897–900, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26746
Difficulties with telephone‐based surveys on alcohol consumption in high‐income countries: the Canadian example
Authors: Shield Kevin D. , Rehm Jürgen 
Published: February 2012

AbstractAccurate information concerning alcohol consumption level and patterns is vital to formulating public health policy. The objective of this paper is to critically assess the extent to which survey design, response rate and alcohol consumption coverage obtained in random digit dialling, telephone‐based surveys impact on conclusions about alcohol consumption and its patterns in the general population. Our analysis will be based on the Canadian Alcohol and Drug Use Monitoring Survey (CADUMS) 2008, a national survey intended to be representative of the general population. The conclusions of this paper are as follows: (1) ignoring people who are homeless, institutionalized and/or do not have a home phone may lead to an underestimation of the prevalence of alcohol consumption and related problems; (2) weighting of observations to population demographics may lead to a increase in the design effect, does not necessarily address the underlying selection bias, and may lead to overly influential observations; and (3) the accurate characterization of alcohol consumption patterns obtained by triangulating the data with the adult per capita consumption estimate is essential for comparative analyses and intervention planning especially when the alcohol coverage rate is low like in the CADUMS with 34%. Copyright © 2012 John Wiley & Sons, Ltd.
Effective block diagonal preconditioners for Biot's consolidation equations in piled‐raft foundations
Authors: Chaudhary K. B. , Phoon K. K. , Toh K. C. 
Published: February 2012

SUMMARYThe finite element (FE) simulation of large‐scale soil–structure interaction problems (e.g. piled‐raft, tunnelling, and excavation) typically involves structural and geomaterials with significant differences in stiffness and permeability. The symmetric quasi‐minimal residual solver coupled with recently developed generalized Jacobi, modified symmetric successive over‐relaxation (MSSOR), or standard incomplete LU factorization (ILU) preconditioners can be ineffective for this class of problems. Inexact block diagonal preconditioners that are inexpensive approximations of the theoretical form are systematically evaluated for mitigating the coupled adverse effects because of such heterogeneous material properties (stiffness and permeability) and because of the percentage of the structural component in the system in piled‐raft foundations. Such mitigation led the proposed preconditioners to offer a significant saving in runtime (up to more than 10 times faster) in comparison with generalized Jacobi, modified symmetric successive over‐relaxation, and ILU preconditioners in simulating piled‐raft foundations. Copyright © 2012 John Wiley & Sons, Ltd.
Patient, companion, and oncologist agreement regarding information discussed during triadic oncology clinical interactions
Authors: Eggly Susan , Penner Louis A. , Hagiwara Nao , Gonzalez Richard , Harper Felicity W. K. , Heath Elisabeth I. , Albrecht Terrance L. 
Published: February 2012

AbstractBackgroundAlthough people with cancer want and need information from their oncologists, patients and oncologists often disagree about what information was discussed during clinical interactions. Most patients have companions present during oncology visits; we investigated whether companions process information more accurately than patients. Specifically, we examined whether patients and companions differed in agreement with oncologists about what was discussed. We also investigated the effect of topic on agreement and patient/companion self‐reported understanding of discussions.MethodsPatients with companions were invited to participate on first visits to a cancer center in Detroit, MI. Patients, companions, and oncologists independently completed questionnaires immediately following visits. Participants were asked whether five topics were discussed (diagnosis, prognosis, metastasis, treatment/treatment goals, and side effects) and, if discussed, what oncologists said. Participants were also asked to estimate their own and each other's understanding of discussions.ResultsA total of 66 patient–companion–oncologist triads participated. Agreement was higher regarding whether topics were discussed than what oncologists said. Agreement did not differ by dyad type. Patients, companions, and oncologists were equally likely to be the source of triadic disagreements. Agreement was high about diagnosis (>90%) but much lower about other topics, particularly side effects. Patients and companions reported greater understanding of discussions than oncologists estimated and more accurately estimated each other's understanding than did oncologists.ConclusionsCompanions and patients showed similar levels of agreement with oncologists about what they discussed during visits. Interventions are needed to improve communication of information to both patients and companions, especially about particular topics.Copyright © 2012 John Wiley & Sons, Ltd.
Making a Living in Rural Vietnam from (Im)mobile Livelihoods: a Case of Women's Migration
Authors: Thao Vu Thi 
Published: February 2012

ABSTRACTWomen's labour has come to play a remarkable role in Vietnam's development since the introduction ofrenovation in the 1980s. Although many rural households send their women members to cities to seek an off‐farm income, other households seem to be immobile. Drawing on a case study of women's migration in two rural villages located in the Red River Delta, this paper explores how mobility, immobility, and gendered life courses interact in shaping household livelihoods. The findings highlight the intermingling of mobility and immobility in constructing the livelihoods of both mover and stayer households over the gendered life course. Although women work in the informal sector, their migration not only secures but also enhances household livelihoods. The paper also reveals the diverse backgrounds of stayer households and their activeness in making a living. Given its emphasis on gendered life courses, the paper provides a more nuanced understanding of the economic impacts of migration at the household level. Copyright © 2012 John Wiley & Sons, Ltd.
Droplet growth in warm turbulent clouds
Authors: Devenish B. J. , Bartello P. , Brenguier J.‐L. , Collins L. R. , Grabowski W. W. , IJzermans R. H. A. , Malinowski S. P. , Reeks M. W. , Vassilicos J. C. , Wang L.‐P. , Warhaft Z. 
Published: February 2012

AbstractIn this survey we consider the impact of turbulence on cloud formation from the cloud scale to the droplet scale. We assess progress in understanding the effect of turbulence on the condensational and collisional growth of droplets and the effect of entrainment and mixing on the droplet spectrum. The increasing power of computers and better experimental and observational techniques allow for a much more detailed study of these processes than was hitherto possible. However, much of the research necessarily remains idealized and we argue that it is those studies which include such fundamental characteristics of clouds as droplet sedimentation and latent heating that are most relevant to clouds. Nevertheless, the large body of research over the last decade is beginning to allow tentative conclusions to be made. For example, it is unlikely that small‐scale turbulent eddies (i.e. not the energy‐containing eddies) alone are responsible for broadening the droplet size spectrum during the initial stage of droplet growth due to condensation. It is likely, though, that small‐scale turbulence plays a significant role in the growth of droplets through collisions and coalescence. Moreover, it has been possible through detailed numerical simulations to assess the relative importance of different processes to the turbulent collision kernel and how this varies in the parameter space that is important to clouds. The focus of research on the role of turbulence in condensational and collisional growth has tended to ignore the effect of entrainment and mixing and it is arguable that they play at least as important a role in the evolution of the droplet spectrum. We consider the role of turbulence in the mixing of dry and cloudy air, methods of quantifying this mixing and the effect that it has on the droplet spectrum. Copyright © 2012 Royal Meteorological Society and British Crown Copyright, the Met Office
Biologically inspired tree‐climbing robot with continuum maneuvering mechanism
Authors: Lam Tin Lun , Xu Yangsheng 
Published: February 2012

AbstractTreebot is the first tree‐climbing robot that is capable of climbing from a tree trunk to a branch. The robot employs several design principles adapted from arboreal animals, including claw gripping and inchworm locomotion, with a certain artificial optimization to achieve high maneuverability on irregular‐shaped trees. Treebot is composed of a pair of tree grippers that permits Treebot to attach to a wide variety of trees with a wide range of gripping curvature, and a novel continuum maneuvering structure that provides high maneuverability and adaptability. In the robot actuation, only five actuators are necessary. Although Treebot weighs only 600 gr, it has a payload capability of 1.75 kg, which is nearly three times its own weight. This paper describes the design process and specifically addresses the robot locomotion and optimization of gripping force. Experimental results demonstrate the robot's ability to climb trees with high maneuverability. © 2012 Wiley Periodicals, Inc.
An investigation on the behavior of stiffened coupled shear walls considering axial force effect
Authors: Hadidi Ali , Farahmand Azar Bahman , Khosravi Hossein 
Published: February 2012

SUMMARYIn most of tall buildings, the main contribution of lateral loads is carried by coupled shear walls. In some cases, the necessary stiffness to withstand the lateral load may not be afforded due to low depth of connecting beams. In order to increase the capacity of the coupled shear walls, beams with high stiffness are added to the system at particular levels. Hence, stiffened coupled shear walls (SCSW) will be produced. Such walls are under axial load resulting from their weight, and this axial load affects the behavior of walls because of their excessive height. In this paper, a new method considering the effect of axial force for geometrically nonlinear analysis of the SCSW has been presented. A computer program has been developed in matlab, and numerical examples have been solved to demonstrate the reliability of this method. The results of the examples show the agreement between the present method and the other methods given in the literature. The effects of the various positions and rigidities of the stiffening beam on the internal forces and the lateral deflection of the structure considering axial force effect have also been investigated. Copyright © 2012 John Wiley & Sons, Ltd.
Short‐term and long‐term climate mitigation policy in Italy
Authors: Massetti Emanuele 
Published: February 2012

AbstractThis article briefly discusses climate mitigation policy in Italy. It first reviews the recent policy action and then assesses the challenges ahead. It shows that emissions in 2012 will be below the Kyoto target only if the carbon intensity of the economies continues to decline at the pre‐crisis rate. Even in this favorable case, the use of Kyoto mechanisms will likely be necessary to compensate for the high emissions of 2008. This article then examines the implications of reducing emissions in 2050 by 80% with respect to the present level, as proposed by Major Economies Leaders during the 2009 G8 meeting. In particular, the article focuses on the transformations needed in the power sector. Scenarios developed using the integrated assessment model World Induced Hybrid Technical Change (WITCH) and an analysis of historical data show that (1) electricity in 2050 must come with zero (or possibly negative) emissions, and therefore, absent nuclear power and (2) carbon capture and sequestration (CCS) must play a major role in future power supply, even with a massive development of wind and photovoltaic. The article then proposes five pillars on which a sensible, long‐term, ambitious Italian climate mitigation policy should rest.WIREs Clim Change2012, 3:171–183. doi: 10.1002/wcc.159This article is categorized under:The Carbon Economy and Climate Mitigation > Policies, Instruments, Lifestyles, BehaviorPolicy and Governance > National Climate Change Policy