bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of multi‐port one‐radiator antenna for octa‐band mobile terminals
Authors: Lee Jae‐Gon , Kim Dong‐Jin , Lee Jeong‐Hae 
Published: July 2017

AbstractIn this article, a multi‐port one‐radiator antenna (MOA) is proposed for the effective design of octa‐band mobile antenna including the LTE secondary (penta‐band), GPS, and BT/Wi‐Fi (2.4 GHz and 5 GHz) band. The MOA is composed of one radiator, high‐pass filter (HPF), and two‐ports. The two‐ports connect to one radiator for the LTE secondary/GPS and the BT/Wi‐Fi band, respectively. To minimize the amount of interference between two ports, one port for BT/Wi‐Fi band has a gap coupled feed and HPF. The VSWRs and the efficiencies of octa‐band without and with the HPF have been measured and compared. The results show that the performance of integrated ports with the HPF is recovered to the same performance of isolated ports. These results indicate that the MOA could be an attractive solution as a compact antenna to cover LTE secondary, GPS, and BT/Wi‐Fi band at mobile terminals.
CFAR based morphological filter design to remove clutter from GB‐SAR images: An application to real data
Authors: Toktas Abdurrahim , Yigit Enes , Sabanci Kadir , Kayabasi Ahmet 
Published: July 2017

AbstractReconstructed ground based synthetic aperture radar (GB‐SAR) data generally presents high resolution images of objects on the ground. However ground and multipath reflections occurred from depression angle appear as a clutter signs in the image. Constant false alarm rate (CFAR) detector is commonly preferred threshold algorithm for removing the clutter. But there is challenge in tuning CFAR. By enlarging or shrinking the window size, the background data taken into account respectively increases or decreases, and thus the filtered image accordingly includes much clutter or less clutter with target information loss. In this study, a novel adaptive clutter removing procedure based on morphological filter (MF) is designed to compensate this tradeoff by applying after a large windowed detector. In order to test the proposed CFAR based MF (CFAR‐MF) method, two different examples of GB‐SAR experiments in which the images are reconstructed by back projection algorithm (BPA) were performed using stepped frequency continuous waveform operating. The performance of CFAR‐MF was then examined in terms of signal to clutter ratio and integrated side lobe ratio. The results show that the clutter remains of the CFAR detector are effectively cleared from the GB‐SAR image and targets were accurately detected at their true locations without any disorder.
Reconfigurable negative group delay circuit with low signal attenuation
Authors: Liu Gang , Xu Jinping 
Published: July 2017

AbstractA novel circuit scheme is presented for the design of reconfigurable negative group delay circuit (RNGDC) with very low signal attenuation (SA), which is based on a lossy coupled‐line Microstrip (MS) resonator. Theoretical analysis indicates that reconfigurable characteristics in the proposed circuits can be obtained by tuning the resistance of the variable resistor, which is loaded at a specific point on the MS resonator. Based on the study of one‐stage RNGDC, a two‐stage RNGDC arranged in an anti‐symmetrical manner is designed to provide an extended reconfigurable negative group delay range. To validate the performance of the proposed circuit scheme, the prototypes of one‐stage and two‐stage RNGDC have been designed working at a center frequency of 1.73 GHz. Measured results of the two‐stage RNGDC exhibit a group delays variation of −2 ns to −10 ns with signal attenuation variation of −4.5 dB to −9.3 dB at the center frequency, which demonstrates much lower SA compared to the previously‐reported RNGDCs.
[1,2,5]thiadiazolo[3,4‐g]quinoxaline acceptor‐based donor–acceptor–donor‐type polymers: Effect of strength and size of donors on the band gap
Authors: Gokce Gurcan , Karabay Baris , Cihaner Atilla , Icli Ozkut Merve 
Published: July 2017

ABSTRACTElectrochromic polymers based on [1,2,5]thiadiazolo[3,4‐g]quinoxaline acceptor and thiophene, 3,4‐ethylenedioxythiophene and 3,3‐didecyl‐3,4‐proylenedioxythiophene donors, namely poly(6,7‐diphenyl‐4,9‐di(thiophen‐2‐yl)‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) (P1), poly(4‐(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐5‐yl)‐9‐(2,3‐dihydrothieno[3,4‐b][1,4]dioxin‐7‐yl)‐6,7‐diphenyl‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) (P2), and poly(4‐(3,3‐didecyl‐3,4‐dihydro‐2H‐thieno[3,4‐b][1,4]dioxepin‐6‐yl)‐9‐(3,3‐didecyl‐3,4‐dihydro‐2H‐thieno[3,4‐b][1,4]dioxepin‐8‐yl)‐6,7‐diphenyl‐[1,2,5]thiadiazolo[3,4‐g]quinoxaline) (P3), respectively, were electrochemically and/or chemically synthesized and characterized. Electrochemical and optical properties of the polymers were then investigated. The results, which were obtained electrochemically and optically, indicate that the polymers bearing the same acceptor and different donor units have a band gap range of 0.59–1.24 eV depending on the strength and size of the donor units and band gap determination method. A significant finding in this study was the phenomenon that when the acceptor is physically huge, the general rule that a weak donor would have a high band gap whereas a strong donor would have low band gap can be broken due to the torsional angles/steric hindrances involved with physically large donor molecules. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017, 55, 3483–3493
Protection motivation theory in predicting intention to receive cervical cancer screening in rural Chinese women
Authors: Bai Yang , Liu Qing , Chen Xinguang , Gao Yanduo , Gong Huiyun , Tan Xiaodong , Zhang Min , Tuo Jiyu , Zhang Yuling , Xiang Qunying , Deng Fenghua , Liu Guiling 
Published: July 2017

AbstractObjectiveDespite the significance of cervical cancer screening, motivating more women to participate remains a challenge in resource‐limited settings. In this study, we tested the protection motivation theory (PMT) in predicting screening intentions.MethodsParticipants were women from Wufeng, a typical rural county in China. Participants (n = 3000) with no cervical cancer history were recruited from 10 randomly selected villages. As mediating variables, 6 PMT constructs (Perceived Risk, Fear Arousal, Perceived Severity, Response Efficacy, Response Cost, and Self‐Efficacy) were measured using the standardized questionnaire. Structural equation modeling (SEM) method was employed to test PMT‐based prediction models.ResultsOf the total sample, 57.77% believed that regular screening may reduce cervical cancer risk, and 45.26% agreed that women should be screened regularly. Our data fit the PMT model well (GFI = 0.95, AGFI = 0.93, CFI = 0.90, RMSEA = 0.06, SRMR = 0.04, Chi‐square/df = 2.47). Knowledge of screening was directly and positively associated with screening intention. Age, annual income, and awareness of and prior experience with screening were significantly associated with screening intention by enhancing cervical cancer risk perception and by reducing response cost (P<0.05 for both).ConclusionPMT can be used as guidance to investigate cervical cancer screening intentions among rural women in China with focus on cancer knowledge, some demographic factors, and awareness of and previous experience with screening. These findings, if verified with longitudinal data, can be used for intervention program development.
A new approach to constrained state estimation for discrete‐time linear systems with unknown inputs
Authors: Garcia Tirado Jose Fernando , Marquez‐Ruiz Alejandro , Botero Castro Hector , Angulo Fabiola 
Published: July 2017

SummaryThis paper addresses the problem of estimating the state for a class of uncertain discrete‐time linear systems with constraints by using an optimization‐based approach. The proposed scheme uses the moving horizon estimation philosophy together with the game theoretical approach to the
filtering to obtain a robust filter with constraint handling. The used approach is constructive since the proposed moving horizon estimator (MHE) results from an approximation of a type of full information estimator for uncertain discrete‐time linear systems, named in short
‐MHE and
–full information estimator, respectively. Sufficient conditions for the stability of the
‐MHE are discussed for a class of uncertain discrete‐time linear systems with constraints. Finally, since the
‐MHE needs the solution of a complex minimax optimization problem at each sampling time, we propose an approximation to relax the optimization problem and hence to obtain a feasible numerical solution of the proposed filter. Simulation results show the effectiveness of the robust filter proposed.
Active vibration control of large space flexible slewing truss using cable actuator with input saturation
Authors: Jin Qi‐Bao , Huang Jin 
Published: July 2017

SummaryThis paper proposes a composite approach to implementing attitude tracking and active vibration control of a large space flexible truss system. The system dynamic model is based on Hamilton's principle and discretized using the finite difference method. A nonlinear attitude controller for position tracking is developed based on the input‐output linearization of the discretized system, which can effectively improve system performance compared with a traditional proportional‐differential feedback controller. A taut cable actuator scheme is presented to suppress tip vibration because the mechanical model is a large large‐span spatial structure; furthermore, because the cable has the feature of unilateral input saturation constraint, which can provide only a pulling force, a nonlinear quadratic regulator controller is developed by introducing a piecewise nonquadratic cost function to suppress the vibration of the flexible structure. To investigate the factors that influence the damping effects of the cable, the parametrically excited instability of a cable under 2 supports is analyzed. Simulation results illustrate that the proposed attitude controller can implement the task of position tracking, and the vibration suppression control law is shown to be optimal for functional performance with input saturation.
Round‐robin test for the measurement of layer thickness of multilayer films by secondary ion mass spectrometry depth profiling
Authors: Kim Kyung Joong , Jang Jong Shik , Bennett Joe , Simons David , Barozzi Mario , Takano Akio , Li Zhanping , Magee Charles 
Published: July 2017

An international round‐robin test (RRT) was performed to investigate a method to determine the interface location and the layer thickness of multilayer films by secondary ion mass spectrometry (SIMS) depth profiling as a preliminary study to develop a new work item proposal in ISO/TC‐201. Two types of reference materials were used in this RRT. A SiGe alloy (Si52.4Ge47.6) reference film was used to determine the relative sensitivity factors of Si and Ge. A Si/Ge multilayer reference film was used to determine the relative sputtering rates of the Si and Ge layers. The layer thicknesses were measured from the interfaces determined by a 50 atomic percent definition. Seven laboratories from 5 countries participated in this international RRT. The RRT reference expanded uncertainties for Si and Ge layers in a Si/Ge multilayer with similar thicknesses as the reference film were 0.76 and 1.17 nm, respectively. However, those in a thinner Si/Ge multilayer film were slightly larger at 1.04 and 1.59 nm, respectively. Most of the thickness ratios in the 2 Si/Ge multilayer films were consistent with the RRT reference value within their expanded uncertainties.
Catalyst‐Free, Glycerol‐Assisted Facile Approach to Imidazole‐Fused Nitrogen‐Bridgehead Heterocycles
Authors: Tufail Fatima , Singh Swastika , Saquib Mohammad , Tiwari Jyoti , Singh Jaya , Singh Jagdamba 
Published: July 2017

AbstractA completely regioselective, environmentally benign strategy for the facile synthesis of biologically important imidazole‐fused nitrogen‐bridgehead heterocycles has been developed using glycerol/water 4:1 as a green promoting media. The methodology involves the simple coupling of 2‐halocarbonyl compounds with 2‐aminopyridines, 2‐aminopyrimidines, 2‐aminopyrazines to obtain a variety of 2‐aryl substituted imidazo‐pyridines, imidazo‐pyrimidines and imidazo‐pyrazines containing bridgehead nitrogen. This protocol eliminates the use of toxic catalysts and volatile organic solvents ‐ two key principles in the development of a green chemical process. Other significant highlights include mild reaction conditions, operational simplicity, short reaction times, easy workup and purification process, high yields and potential for scale‐up.
Concise Review: Stem Cells for Corneal Wound Healing
Authors: Saghizadeh Mehrnoosh , Kramerov Andrei A. , Svendsen Clive N. , Ljubimov Alexander V. 
Published: July 2017

Abstract
Corneal wound healing is a complex process that occurs in response to various injuries and commonly used refractive surgery. It is a significant clinical problem, which may lead to serious complications due to either incomplete (epithelial) or excessive (stromal) healing. Epithelial stem cells clearly play a role in this process, whereas the contribution of stromal and endothelial progenitors is less well studied. The available evidence on stem cell participation in corneal wound healing is reviewed, together with the data on the use of corneal and non-corneal stem cells to facilitate this process in diseased or postsurgical conditions. Important aspects of corneal stem cell generation from alternative cell sources, including pluripotent stem cells, for possible transplantation upon corneal injuries or in disease conditions are also presented.
Short‐Term Outcomes of Totally Laparoscopic Central Hepatectomy and Right Anterior Sectionectomy for Centrally Located Tumors: A Case‐Matched Study with Propensity Score Matching
Authors: Cho Chan Woo , Rhu Jinsoo , Kwon Choon Hyuck David. , Choi Gyu‐Seong , Kim Jong Man , Joh Jae‐Won , Koh Kwang‐Cheol , Kim Gaab Soo 
Published: July 2017

AbstractBackgroundRecent advances in technology and accumulation of surgical experience have expanded the indications for laparoscopic liver resection (LLR). However, compared to open liver resection (OLR), the feasibility of laparoscopic anatomical liver resection for centrally located tumor (CLT) has not been clearly established. The aim of our study was to assess the feasibility and safety of laparoscopic anatomical major liver resection for CLT.MethodsFrom April 2011 to March 2016, 20 cases of anatomical LLR and 86 cases of OLR for CLTs such as central hepatectomy (CH) and right anterior sectionectomy (RAS) were performed at a single institution. We performed one‐to‐one propensity score matching and analyzed short‐term outcomes between the LLR (n = 20) and OLR (n = 20) groups.ResultsAmong 20 cases in the LLR group, two cases underwent open conversion due to common bile duct injury and anatomical distortion, respectively. There were no statistically significant difference between the LLR and OLR groups regarding clamping time of the Pringle maneuver (p = 0.502), blood loss (p = 0.746), surgical margin (p = 0.198), or length of hospital stay (p = 0.110). However, surgical time was significantly longer in the LLR group than in the OLR group (388 vs 268 min; p < 0.001). There were no significant differences between the two groups with regard to morbidity rate or mean comprehensive complication index (p = 0.716 and p = 0.819, respectively).ConclusionTotal anatomical LLR can be performed safely in selected CLT patients by experienced surgeons. Laparoscopic CH or RAS appears feasible with non‐inferior perioperative outcomes compared to OLR.
Best friends' interactions and substance use: The role of friend pressure and unsupervised co‐deviancy
Authors: Tsakpinoglou Florence , Poulin François 
Published: July 2017

ABSTRACTBest friends exert a substantial influence on rising alcohol and marijuana use during adolescence. Two mechanisms occurring within friendship ‐ friend pressure and unsupervised co‐deviancy ‐ may partially capture the way friends influence one another. The current study aims to: (1) examine the psychometric properties of a new instrument designed to assess pressure from a youth's best friend and unsupervised co‐deviancy; (2) investigate the relative contribution of these processes to alcohol and marijuana use; and (3) determine whether gender moderates these associations. Data were collected through self‐report questionnaires completed by 294 Canadian youths (62% female) across two time points (ages 15–16). Principal component analysis yielded a two‐factor solution corresponding to friend pressure and unsupervised co‐deviancy. Logistic regressions subsequently showed that unsupervised co‐deviancy was predictive of an increase in marijuana use one year later. Neither process predicted an increase in alcohol use. Results did not differ as a function of gender.
The Effectiveness of Nurse Residency Programs on Retention: A Systematic Review
Authors: Van Camp Jennifer , Chappy Sharon 
Published: July 2017

AbstractNew graduates account for the highest numbers of nurses entering and exiting the profession. Turnover is costly, especially in specialty settings. Nurse residency programs are used to retain new graduates and assist with their transition to nursing practice. The purpose of this systematic review of the literature was to examine new graduate nurse residency programs, residents’ perceived satisfaction, and retention rates, and to make recommendations for implementation in perioperative settings. Results indicate increased retention rates for new graduates participating in residency programs and that residency participants experienced greater satisfaction with their orientation than those not participating in residency programs. Residency participants also perceived the residency as beneficial. Because residency programs vary in curricula and length, effectively comparing outcomes is difficult. More longitudinal data are needed. Data on residency programs specific to perioperative nursing are lacking. Considering the aging perioperative nursing workforce, residency programs could address critical needs for succession planning.
Guideline Implementation: Minimally Invasive Surgery, Part 2—Hybrid ORs
Authors: Cowperthwaite Liz , Fearon Mary C. 
Published: July 2017

AbstractPerforming both surgical and imaging procedures in a hybrid OR can increase efficiency by reducing the number of patient transfers between departments and the number of patient hand overs between personnel. A hybrid OR is, however, a complex environment that requires integrating the knowledge and skills of personnel from multiple disciplines to create a successful workflow. When magnetic resonance imaging (MRI) equipment is installed in the hybrid OR, additional precautions are required to help ensure the environment is safe for patients and personnel. AORN's updated “Guideline for minimally invasive surgery” provides guidance for personnel designing and working in hybrid ORs and MRI hybrid ORs. This article focuses on key points of the guideline that address hybrid OR configuration, hybrid OR staffing, and mitigating risks associated with intraoperative MRI. Perioperative RNs should review the complete guideline for additional information and for guidance when writing and updating policies and procedures.
Experimental investigation of the turbulence induced by a bubble swarm rising within incident turbulence
Authors: Alméras Elise , Mathai Varghese , Lohse Detlef , Sun Chao 
Published: July 2017

This work reports an experimental characterisation of the flow properties in a homogeneous bubble swarm rising at high Reynolds numbers within a homogeneous and isotropic turbulent flow. Both the gas volume fraction $\unicode[STIX]{x1D6FC}$ and the velocity fluctuations $u_{0}^{\prime }$ of the carrier flow before bubble injection are varied, respectively, in the ranges $0\,\%<\unicode[STIX]{x1D6FC}<0.93\,\%$ and $2.3~\text{cm}~\text{s}^{-1}<u_{0}^{\prime }<5.5~\text{cm}~\text{s}^{-1}$. The so-called bubblance parameter ($b=V_{r}^{2}\unicode[STIX]{x1D6FC}/u_{0}^{\prime 2}$, where $V_{r}$ is the bubble relative rise velocity) is used to compare the ratio of the kinetic energy generated by the bubbles to the one produced by the incident turbulence, and is varied from 0 to 1.3. Conditional measurements of the velocity field downstream of the bubbles in the vertical direction allow us to disentangle three regions that have specific statistical properties, namely the primary wake, the secondary wake and the far field. While the fluctuations in the primary wake are similar to that of a single bubble rising in a liquid at rest, the statistics of the velocity fluctuations in the far field follow a Gaussian distribution, similar to that produced by the homogenous and isotropic turbulence at the largest scales. In the secondary wake region, the conditional probability density function of the velocity fluctuations is asymmetric and shows an exponential tail for the positive fluctuations and a Gaussian one for the negative fluctuations. The overall agitation thus results from the combination of these three contributions and depends mainly on the bubblance parameter. For $0<b<0.7$, the overall velocity fluctuations in the vertical direction evolve as $b^{0.4}$ and are mostly driven by the far-field agitation, whereas the fluctuations increase as $b^{1.3}$ for larger values of the bubblance parameter ($b>0.7$), in which the significant contributions come both from the secondary wake and the far field. Thus, the bubblance parameter is a suitable parameter to characterise the evolution of liquid agitation in bubbly turbulent flows.
The feasibility of imaging subglacial hydrology beneath ice streams with ground-based electromagnetics
Authors: KEY KERRY , SIEGFRIED MATTHEW R. 
Published: July 2017

ABSTRACTSubglacial hydrologic systems in Antarctica and Greenland play a fundamental role in ice-sheet dynamics, yet critical aspects of these systems remain poorly understood due to a lack of observations. Ground-based electromagnetic (EM) geophysical methods are established for mapping groundwater in many environments, but have never been applied to imaging lakes beneath ice sheets. Here, we study the feasibility of passive- and active-source EM imaging for quantifying the nature of subglacial water systems beneath ice streams, with an emphasis on the interfaces between ice and basal meltwater, as well as deeper groundwater in the underlying sediments. We describe a suite of model studies that exam the data sensitivity as a function of ice thickness, water conductivity and hydrologic system geometry for models representative of a subglacial lake and a grounding zone estuary. We show that EM data are directly sensitive to groundwater and can image its lateral and depth extent. By combining the conductivity obtained from EM data with ice thickness and geological structure from conventional geophysical techniques, such as ground-penetrating radar and active seismic surveying, EM data have the potential to provide new insights on the interaction between ice, rock and water at critical ice-sheet boundaries.