bluuebunny/crossref_metadata_2025_split huggingface dataset:
A narrow compact band pass filter with second harmonics suppression using the T‐SRR in MNG metamaterial
Authors: Yoon Ki‐Cheol , Lee Hyun‐Wook , Lee Jong‐Chul , Kim Seong‐Cheol 
Published: January 2014

ABSTRACTIn this article, a new narrow band pass filter (BPF) with second harmonic suppression using triple‐split ring resonator (T‐SRR) in mu‐negative metamaterial on Teflon substrate is presented. Then by replacing the series quarter‐wavelength transmission lines with the equivalent T‐shaped line, a compact‐BPF with second harmonic suppression can be obtained. This filter shows an insertion loss of 0.47 dB and return loss of 21.8 dB with bandwidth of 10% at the center frequency of 10 GHz. Also, the experimental result for the second harmonic (S21) suppression is 17.7 dB at a frequency of 14.7 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:535–538, 2014
Frequency selective surfaces filters to enhance performance of Ka band applications
Authors: Sanphuang Varittha , Nahar Niru K. , Volakis John L. 
Published: January 2014

ABSTRACTWe present circular‐loop and fan‐shaped periodic geometries for narrow and broad passband Ka band filters using frequency selective surfaces (FSS), respectively. Two narrowband designs are obtained having less than 0.5‐dB attenuation with nearly −20‐dB out‐of‐band rejection. A three‐layer broadband (30%) FSS is also presented with high transmission and excellent flat bandpass response that covers almost the entire Ka band. Experimental results are also discussed to validate both the single‐layer and three‐layer designs. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:563–568, 2014
Fast 3D raytracing used for predicting TEMPEST classification
Authors: Legendre Jean‐François , Marsault Thierry , Ollivier Thierry 
Published: January 2014

ABSTRACTWith the growth of high data rate speed cellular communication systems (UMTS, GSM, WiFi, Bluetooth), prediction of the electromagnetic propagation becomes a military strategic stake and an active subject of research. To give fast realistic predictions of the field strength and delay spread in wireless mobile communication networks, SILICOM developed the SLC software within the context of PEA GOLIATH project supported by DGA. This model is based on parallel three‐dimensional raytracing combined with GO/UTD theory. This article describes our solution and shows its application to TEMPEST classification study of buildings. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:519–523, 2014
Akhmediev breathers as ultra‐wideband pulses
Authors: Varlot B. , Chembo Y. , Finot C. 
Published: January 2014

ABSTRACTWe analytically calculate and discuss the radio‐frequency spectrum of the so called Akhmediev breathers (ABs), a class of nonlinear solutions of the nonlinear Schrödinger equation that governs the propagation in a single mode optical fiber. We propose a practical application of ABs to the field of ultra‐wideband pulse generation. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:664–667, 2014
Wideband loop antenna using distributed elements for 4G MIMO mobile application
Authors: Zhao Xing , Choi Jaehoon 
Published: January 2014

AbstractWideband loop antennas with distributed elements are proposed for a fourth generation (4G) multiple‐input multiple‐output (MIMO) mobile terminal. The MIMO antenna system consists of two wideband loop antenna elements (Elements #1 and #3), working in the LTE Band 7 (0.88–0.96 GHz), and a printed U‐shaped monopole antenna element (Element #2), operating in the WiMAX/WLAN bands (2.0–2.8 GHz). To improve the performances of antenna elements, the distributed elements are employed to reduce the antenna volume, to realize the wideband property, and to modify the input impedance of antenna elements. The arrangement of each antenna element is carefully justified and each element is located at different corners of the ground plane to improve the isolation and envelope correlation coefficient (ECC) characteristics. The MIMO antenna has an ECC lower than 0.1 and isolation higher than 11 dB over the frequency bands of interest. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:577–581, 2014
Double B‐spline finite elements for 3D electromagnetic modeling
Authors: Davidović Miloš D. , Ilić Milan M. 
Published: January 2014

AbstractNovel type of finite elements, based on independent three‐dimensional higher‐order modeling of geometry and electric fields using trivariate B‐spline functions, is presented. The method is evaluated in simulations of rectangular, spherical, and ridged canonical microwave cavity problems. The examples demonstrate excellent accuracy and efficiency of the proposed method. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:619–624, 2014
Very low profile ultrawideband microstrip band‐stop filter
Authors: Ojaroudi Nasser , Ojaroudi Hamed , Ojaroudi Yasser 
Published: January 2014

ABSTRACTIn this article, a compact microstrip band‐stop filter with 3–11.2‐GHz bandwidth for ultrawideband applications is proposed. The microstrip filter configuration consists of a transmission line with a pair of C‐shaped strips as a stub, four arc‐shaped slots embedded inside them, and a ground plane. An excellent agreement between measured and simulated results was obtained. 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 × 0.635 mm3. The proposed filter configuration is simple, easy to fabricate, and can be integrated into any radar system. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:709–711, 2014
Design and implementation of A 1.9–22.5 GHz CMOS wideband LNA with dual‐RLC‐branch wideband input and output matching networks
Authors: Lin Yo‐Sheng , Wang Chien‐Chin , Lee Jen‐How 
Published: January 2014

ABSTRACTA 1.9–22.5 GHz wideband low‐noise amplifier (LNA) based on the current‐reused cascade configuration in 90 nm CMOS is reported. The wideband input‐impedance matching was achieved by taking advantage of the resistive shunt‐shunt feedback in conjunction with a parallel LC load to make the input network equivalent to two parallel resistor‐inductor‐capacitor (RLC) branches, that is, a second‐order wideband band‐pass filter (BPF). The wideband output‐impedance matching was also achieved by making the output network equivalent to a second‐order wideband BPF. Theoretical analysis shows that both the frequency response of input matching and noise figure (NF) can be described by second‐order functions with quality factors as parameters. The LNA (LNA‐1) dissipates 9.96 mW and achieves low and flat NF of 3.24 ± 0.5 dB and high and flat S21 of 12.02 ± 1.5 dB for frequencies 1.9–22.5 GHz. The corresponding figure of merit (FOM) is 7.44 GHz/mW, one of the highest FOMs ever reported for a wideband LNA with bandwidth around 20 GHz. To study the effect of self‐forward body bias (SFBB) on LNA‐1, an LNA‐2 consisting of LNA‐1 and SFBB is implemented for comparison. The results show LNA‐2 consumes less power at the expense of a worse NF due to the body noise. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:677–684, 2014
Miniaturized broadband branch‐line coupler
Authors: Wu Qiuyi , Yang Yimin , Lin Mingzhong , Shi Xiaowei 
Published: January 2014

ABSTRACTThis article introduces a new miniaturized branch‐line coupler for wideband applications. The coupler can be realized in microstripline with one layer of metal, without additional lumped elements. Significant size reduction is achieved using the proposed configurations. Explicit design formulas of the proposed coupler are analytically derived. Then it has been simulated with HFSS and fabricated. Return loss and isolation loss are both better than 20 dB in about 31% fractional bandwidth. Over this frequency band, the phase unbalance between two quadrature outputs is less than 2°. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:740–743, 2014
Imposing Dirichlet boundary conditions in hierarchical Cartesian meshes by means of stabilized Lagrange multipliers
Authors: Tur M. , Albelda J. , Nadal E. , Ródenas J. J. 
Published: January 2014

SUMMARYThe use of Cartesian meshes independent of the geometry has some advantages over the traditional meshes used in the finite element method. The main advantage is that their use together with an appropriate hierarchical data structure reduces the computational cost of the finite element analysis. This improvement is based on the substitution of the traditional mesh generation process by an optimized procedure for intersecting the Cartesian mesh with the boundary of the domain and the use efficient solvers based on the hierarchical data structure. One major difficulty associated to the use of Cartesian grids is the fact that the mesh nodes do not, in general, lie over the boundary of the domain, increasing the difficulty to impose Dirichlet boundary conditions. In this paper, Dirichlet boundary conditions are imposed by means of the Lagrange multipliers technique. A new functional has been added to the initial formulation of the problem that has the effect of stabilizing the problem. The technique here presented allows for a simple definition of the Lagrange multipliers field that even allow us to directly condense the degrees of freedom of the Lagrange multipliers at element level. Copyright © 2014 John Wiley & Sons, Ltd.
Optimal penalty stiffness values of concurrent 2D elastic interface elements leading to accurate stress tractions
Authors: Ciancio D. , Carol I. , Castellazzi G. 
Published: January 2014

SUMMARYZero‐thickness interface elements are used to model contact surfaces or potential cracks. In these cases, their elastic stiffness is often set extremely high to reproduce a rigid behavior. This paper shows that the values of the stress tractions at the nodes of these elements can be affected by an error. A new procedure is proposed here, consisting of adding some nondimensional coefficients (purely geometry‐dependent) to the values of the interface stiffness parameters. Thus doing, the accurate tractions at the interface nodes are recovered. Copyright © 2014 John Wiley & Sons, Ltd.
The use of social media among health care professionals within an online postgraduate diabetes diploma course
Authors: Lipp A , Davis RE , Peter R , Davies JS 
Published: January 2014

AbstractSocial media is a rapidly growing arena through which members of the health care community can communicate between themselves as well as inform and educate patients. We assessed the impact of certain types of social media (YouTube and Twitter) among a group of health care professionals (HCPs) studying for a diploma in diabetes with the University of South Wales.As part of a module of the diabetes diploma, HCPs were tasked with using social media (Twitter and YouTube) to communicate information on diabetes and metrics were assessed on its impact. In respect of Twitter accounts, interactivity was assessed through number of ‘tweets’ users posted, the number of ‘followers’ that each account attracted together with the number of people that the user ‘followed’. For YouTube videos, we collected data on the length of video, the number of views each received as well as ‘likes’ or ‘dislikes’. We also asked all students to complete a voluntary questionnaire on their subjective feelings regarding their experience with social media.Of 89 subjects, 27 developed YouTube videos and 62 set up Twitter accounts (in the event of a subject using both Twitter and YouTube, only their YouTube data are used). Average video length was 7 minutes 10 seconds, with videos viewed from 20–1274 times up to August 2012. Sixty‐two Twitter accounts were established with an average of 77 tweets, average of 34 ‘followers’ and an average of 49 ‘following’. Thirteen (15%) HCPs responded to a feedback questionnaire, four having selected YouTube and nine, Twitter. Eight students expressed apprehension before embarking on the task but all expressed a sense of achievement and confidence in use of social media upon completion. Fifty (81%) HCPs stopped using Twitter within six months of completing the module, although Twitter activity continued among 12 (19%) HCPs.This study reveals a successful uptake and communication of a professional message to a wider audience through Twitter and YouTube among social media‐naïve HCPs studying for a postgraduate diploma in diabetes. Despite initial apprehension, HCPs felt confident in using social media to convey the message with continuing use of social media beyond the confines of the course. Copyright © 2014 John Wiley & Sons.
Insulin pump users would not rule out using an implantable artificial pancreas
Authors: Taylor MJ , Gregory R , Mitchell H , Alblihed M , Alsabih A , Tomlins P , Sahota TS 
Published: January 2014

AbstractThe aim of this survey was to establish the limitations of open loop continuous subcutaneous insulin infusion (CSII) as perceived by current users of the technology, and to ascertain their interest in and requirements for a non‐electronic implantable closed loop insulin pump, INSmart, currently under development for the treatment of type 1 diabetes. INSmart has been surgically implanted in the peritoneum in animal models and continuously restored normoglycaemia.A bottom‐up survey design was used to determine both positive and negative experiences of patients currently using CSII to define the performance characteristics they would require from a non‐electronic, implantable closed loop insulin pump.A total of 360 insulin pump users completed the survey. All respondents had type 1 diabetes, were predominantly from English‐speaking countries and had been diagnosed before age 34 years. Most had well controlled blood glucose (BG) according to their self‐reported HbA1c results. They reported a reduction in this value after transferring to CSII from multi‐dose injections. However, 70% of pump users had more than three hypoglycaemic episodes per week. Eighty percent reported self‐measured BG values >10mmol/L three or more times per month; 94% of respondents considered a (non‐electronic implantable) closed loop insulin pump would make their BG management easier and improve their quality of life.The majority of respondents felt there were still many disadvantages to current external insulin pumps such as their constant visible presence, rotation of insertion sites and skin inflammation. These shortfalls could be overcome by a device, such as INSmart, that provides a relatively instant feedback mechanism for controlling insulin release due to its proposed location in the peritoneal cavity. Copyright © 2014 John Wiley & Sons.
Bifacial concentrator Ag‐free crystalline n‐type Si solar cell
Authors: Untila Gennady G. , Kost Tatiana N. , Chebotareva Alla B. , Zaks Marat B. , Sitnikov Аndrey М. , Solodukha Oleg I. , Shvarts Мaxim Z. 
Published: January 2014

AbstractWe report results obtained using an innovative approach for the fabrication of bifacial low‐concentrator thin Ag‐free n‐type Cz‐Si (Czochralski silicon) solar cells based on an indium tin oxide/(p+nn+)Cz‐Si/indium fluorine oxide structure. The (p+nn+)Cz‐Si structure was produced by boron and phosphorus diffusion from B‐ and P‐containing glasses deposited on the opposite sides of n‐type Cz‐Si wafers, followed by an etch‐back step. Transparent conducting oxide (TCO) films, acting as antireflection electrodes, were deposited by ultrasonic spray pyrolysis on both sides. A copper wire contact pattern was attached by low‐temperature (160°C) lamination simultaneously to the front and rear transparent conducting oxide layers as well as to the interconnecting ribbons located outside the structure. The shadowing from the contacts was ~4%. The resulting solar cells, 25 × 25 mm2 in dimensions, showed front/rear efficiencies of 17.6–17.9%/16.7–17.0%, respectively, at one to three suns (bifaciality of ~95%). Even at one‐sun front illumination and 20–50% one‐sun rear illumination, such a cell will generate energy approaching that produced by a monofacial solar cell of 21–26% efficiency. Copyright © 2014 John Wiley & Sons, Ltd.
On dimers and complexes of tetracene and the Kasha's molecular excitonic model
Authors: Catalán Javier 
Published: January 2014

Aggregation processes that occur in a solution of 3.4 × 10−5 M tetracene in decalin at 213 K and in a 1.3 × 10−4 M solution of anthracene in methylcyclohexane at 135 K show that they are second‐order kinetic processes responsible for generating the corresponding dimeric structures of these acenes. The UV–Vis absorption spectra of these dimeric structures show the presence of isosbestic points. We also show that the rate constants of these processes appear to depend on the viscosity of the solvent employed. Excitonic interactions involved in these dimers are described in the light of Kasha's model.We also show that a solution of 6.7 × 10−5 of tetracene in toluene at 173 K exhibits aggregation but following a first order kinetics and that the corresponding absorption spectra describing the process at 173 K show no isosbestic points. Consequently, it is concluded that in this solvent, the tetracene does not dimerize, but it forms a complex with toluene. The strong similarity between the first band of the tetracene dimer and the tetracene/toluene complex may give rise to a strong controversy over the excitonic model to be considered. Copyright © 2014 John Wiley & Sons, Ltd.
Development of a steel component combustion model for fires involving pure oxygen systems
Authors: Cox Brenton L. , Dee Sean J. , Hart Ryan J. , Morrison Delmar R. 
Published: January 2014

Pure oxygen systems pose significant fire and explosion risk to equipment, operations, and personnel if a loss of oxygen containment occurs. In industrial oxygen systems, combustion of metal can be initiated by a variety of ignition sources. The combustion of process vessel walls, components, or piping can result in loss of containment of pressurized oxygen. Automatic shutdown and isolation systems are designed to detect loss of containment, incipient loss of containment due to process parameters (e.g., pressure drop), or internal fire conditions. The effectiveness of these isolation systems is dependent upon the speed with which they activate after the initiating event.The prediction of failure modes and time scales can be an important tool in the design, operation, and maintenance of industrial high purity oxygen systems. Modeling of metal consumption in oxygen fueled fires requires consideration of multiple ignition mechanisms. Previously published experimentation has been motivated by the need to compare the relative burn resistance of metals and nonmetals under a variety of operating conditions, but has not produced a tool to inform the potential for loss of containment in oxygen systems based on the different ignition mechanism failure modes.This work aims to develop a series of theoretical models using experimental results and kinetic relationships in order to predict loss of containment in piping for industrial systems for combinations of different failure modes. Using this type of analysis, process designers can make informed decisions on the design of high purity oxygen systems, the timescale required by emergency shutdown systems, and schedules for routine maintenance and inspection. © 2014 American Institute of Chemical Engineers Process Saf Prog 33: 299–304, 2014
Chaotic map‐based three‐party authenticated key agreement
Authors: Lin Han‐Yu 
Published: January 2014

ABSTRACTThree‐party authenticated key exchange protocols are designed for facilitating secure communication between two users with the assistance of an authentication server. To achieve this purpose, encrypted key exchanges are commonly adopted mechanisms to generate a shared session key for both users. However, this approach usually utilizes the server's public key to encrypt communication messages and hence raises the issue of key management. Without executing time‐consuming modular exponentiation, recently, chaos‐based systems have been widely employed in many security protocols. In this paper, the author will propose a chaotic map‐based three‐party authenticated key agreement without using the server's public key. Additionally, the computational efficiency with related mechanisms is also demonstrated. Copyright © 2014 John Wiley & Sons, Ltd.
Fostering Inference Generation With Emergent and Novice Readers
Authors: Dougherty Stahl Katherine A. 
Published: January 2014

AbstractInference generation makes a strong, unique contribution to reading comprehension. Young children engage in many of the same inference generation processes as sophisticated readers. This article discusses instructional practices that can be used in prekindergarten through grade two to help children think beyond the words of the text. Suggestions are made for planning lessons for narratives that incorporate asking powerful questions and think‐alouds. The article provides descriptions of the effective use of teacher read‐alouds, videos, wordless picture books, and shared reading to improve the narrative comprehension of young children. A sample lesson plan series is provided
Comparing the Characteristics of Homeless Adults in Poland and the United States
Authors: Toro Paul A. , Hobden Karen L. , Wyszacki Durham Kathleen , Oko-Riebau Marta , Bokszczanin Anna 
Published: January 2014

AbstractThis study compared the characteristics of probability samples of homeless adults in Poland (N = 200 from two cities) and the United States (N = 219 from one city), using measures with established reliability and validity in homeless populations. The same measures were used across nations and a systemic translation procedure assured comparability of measurement. The two samples were similar on some measures: In both nations, most homeless adults were male, many reported having dependent children and experiencing out‐of‐home placements when they themselves were children, and high levels of physical health problems were observed. Significant national differences were also found: Those in Poland were older, had been homeless for longer, showed lower rates on all psychiatric diagnoses assessed (including severe mental and substance abuse disorders), reported less contact with family and supportive network members, were less satisfied when they sought support from their networks, and reported fewer recent stressful life events and fewer risky sexual behaviors. Culturally‐informed interpretations of these findings and their implications are presented.
Community Matters: Intimate Partner Violence Among Rural Young Adults
Authors: Edwards Katie M. , Mattingly Marybeth J. , Dixon Kristiana J. , Banyard Victoria L. 
Published: January 2014

AbstractDrawing on social disorganization theory, the current study examined the extent to which community‐level poverty rates and collective efficacy influenced individual reports of intimate partner violence (IPV) perpetration, victimization, and bystander intervention among a sample of 178 young adults (18–24; 67.4 % women) from 16 rural counties across the eastern US who completed an online survey that assessed demographic information, IPV perpetration, victimization, bystander intervention, and collective efficacy. We computed each county's poverty rate from the 2007–2011 American Community Survey. Generalized estimating equations demonstrated that after controlling for individual‐level income status, community‐level poverty positively predicted IPV victimization and perpetration for both men and women. Collective efficacy was inversely related to IPV victimization and perpetration for men; however, collective efficacy was unrelated to IPV victimization and perpetration for women. Whereas IPV bystander intervention was positively related to collective efficacy and inversely related to individual‐level income status for both men and women, community‐level poverty was unrelated to IPV bystander intervention for both men and women. Overall, these findings provide some support for social disorganization theory in explaining IPV among rural young adults, and underscore the importance of multi‐level IPV prevention and intervention efforts focused around community‐capacity building and enhancement of collective efficacy.