bluuebunny/crossref_metadata_2025_split huggingface dataset:
A model for implementing sustainable mHealth applications in a resource‐constrained setting: A case of Malawi
Authors: Pankomera Richard , van Greunen Darelle 
Published: February 2018

AbstractThe proliferation of mobile devices in a resource‐constrained setting like Malawi has created an enabling environment for the deployment of mobile health (mHealth) applications. These applications offer various services such as maternal and child health, nutrition, and HIV management in different localised places in Malawi. Unfortunately, most of these applications are pilot projects that are not centrally managed by the government. The downside of this approach is that most projects are not scaled up once they are completed. As a result, there is no continuity of the mHealth projects. Because of a lack of coordination, lessons learned from one projects are not propagated to other projects. The lack of sustainability of mHealth projects wastes a lot of resources. The comprehensive literature study and semistructured interviews in public health and Information and Communications Technology (ICT) sector in Malawi further highlighted the following challenges: poor infrastructure, lack of proper policy and regulation, lack of human skills and development, lack of financial resources, and poor ICT governance. Guiding policies were subsequently proposed to circumvent the aforementioned challenges. An ICT model is therefore proposed to effectively manage the sustainability of mHealth projects in Malawi. The proposed model has the following phases: solution requirement, strategy for project execution, implementation of the solution, and monitoring and evaluation. The model was further validated by 5 experts selected from different areas of expertise including mHealth application developers, ICT policymakers, and public health practitioners. Results show that the model is relevant, useful, and applicable within the setting of Malawi. It is therefore envisaged that the model can be used by policymakers, decision makers, and ICT implementers for the smooth utilisation of resources and the sustainability of mHealth applications in Malawi.
Differential‐fed printed monopole antenna loaded with half cylindrical DR for UWB handheld device application
Authors: Lu Liang , Jiao Yong‐Chang , Zhang Li , Cui Chao‐Yi , Wang Rui‐Qi 
Published: February 2018

AbstractLoaded with dielectric resonator (DR), a differential‐fed printed monopole antenna is proposed and investigated. Consisting of a half sector cylindrical DR and a two‐layer dielectric substrate, the antenna has a pair of differential‐fed monopoles acting as radiator as well as feeding network for the DR. When the DR is loaded, the differential reflection coefficient bandwidth is improved from 52.95% to 115.4%. Moreover, different from the traditional antenna, cross polarization of the antenna can radiate in co‐polarization null radiation pattern regions in E‐plane. So, cross polarization and co‐polarization can together radiate omnidirectional patterns in E‐plane, which indicates that the antenna can be used as handheld device to receive signals efficiently.
Grounded CPW multi‐band wearable antenna for MBAN and WLAN applications
Authors: Hosseini Varkiani Seyed Mohsen , Afsahi Majid 
Published: February 2018

AbstractIn this paper, a grounded CPW‐fed multi‐band (GCM) wearable antenna for WLAN and medical application is presented. The multi‐band antenna operated at 2.4 GHz, 3.5 GHz, 6 GHz, and 6.7 GHz with a size of 58.5 mm × 62 mm. The grounded CPW consists of T‐shape silver fabric for radiating patch and defected rectangular ground plane. The antenna fabricated and tested on two different substrate, the non‐woven layer and cotton layer with dielectric constant 1.15, thickness 5 mm, and dielectric constant 1.65 with thickness 1 mm, respectively. The numerical and experimental result for different bending conditions are studied and also the antenna implementation on cotton layer using adhesive and sewing are compared. In different bending condition and different fabrication structures the result shows a good agreement between measurement results and simulations. The comparison confirms that the GCM wearable antenna could be a good candidate for wearable WLAN applications.
Multilayer liquid metamaterial radome design for performance enhancement of microstrip patch antenna
Authors: Patel Shobhit K. , Shah Karan H. , Kosta Y. P. 
Published: February 2018

AbstractIn this manuscript microstrip patch antenna loaded with multilayer liquid metamaterial radome (superstrate) structures for gain enhancement is presented. The antenna superstrate is loaded with three ring split ring resonator (SRR) metamaterial. Two multilayer radome structures used for enhancement of gain and protection of conventional microstrip patch antenna. First multilayer structure is made with six equal layers of three ring SRR and second multilayer structure is made with four log periodic layers of three ring SRR. The microstrip patch antenna loaded with multilayer SRR radome structure is compared with conventional microstrip patch antenna. The results of proposed design are compared in form of reflection coefficient, gain and bandwidth. The enhancement in gain is achieved by covering antenna with different radome structures.
Design and analysis of a resonator based metamaterial for sensor applications
Authors: Rahman M. N. , Islam M. T. , Samsuzzaman M. 
Published: February 2018

AbstractA resonator based metamaterial for sensor application is studied in this paper. The resonator is encompassed by a partial ground plane and excited by a microstrip feed‐line. As the resonator, partial ground frame, and the feeding transmission line are on the same microstrip, the measurement can be executed by using the common laboratory facility instead of using the waveguide. The proposed metamaterial occupies a compact size of 20 × 20 mm2 and is imprinted on a low‐cost FR4 substrate. The substrate has a relative permittivity of 4.6 with a dielectric loss tangent of 0.02. The resonator and the ground frame are placed on the similar part of the substrate and the feed‐line is placed on the other part of the substrate. In metamaterial design, normally arrays of metamaterial unit cells are needed, whereas this study presents only one cell, which can achieve the metamaterial properties. The characteristic parameters are fetched and analyzed to find the concurrency between the simulated and measured results. The presented metamaterial is applied in sensor applications where the simulated and measured results reveal considerable agreement.
A single frequency narrow linewidth fiber laser based on quasi‐π‐phase‐shifted grating
Authors: She L. J. , Zhang D. T. , Wang X. L. , Chen D. R. 
Published: February 2018

AbstractWe propose and demonstrate a single frequency narrow linewidth fiber laser composed of the quasi‐π‐phase‐shifted grating (QπPSG) with a short line cavity and a structure of distributed feedback. On the high‐precision displacement platform, quasi‐π phase shift is introduced between two uniform fiber Bragg gratings based on a high‐concentration Erbium‐doped fiber (EDF) by ultraviolet exposure. Coupling the 980 nm pumped light to the QπPSG, the obtained laser is further amplified using a section of low‐concentration EDF. The single frequency lasing is achieved with a central wavelength of 1550.5 nm, and a slope efficiency of about 5.7%.
Design and development of vivaldi antenna array for wind profiler RADAR application
Authors: Prakash Anand , Chattoraj Neela , Shukla Satya Bhushan 
Published: February 2018

AbstractWind velocity profile are required for the study of atmospheric phenomena and weather forecasting. Atmospheric radar is a remote sensing instruments, which can observe the air motion of the troposphere with high degrees of accuracy. Wind Profile Radar (WPR) can provide the three dimensional profile of wind velocities and wind direction of each layer of atmosphere in real time and has become crucial to the world today. In this article, the Vivaldi antenna array is designed and developed for WPR that would operate at center frequency of 1.35 GHz and the VSWR <2 over frequency range from 1.25 to 1.45 GHz and also to design and develop 1:4 equal Split Wilkinson Power divider. The microstrip design is optimized and utilized in a corporate‐feeding network for an antenna array. The return loss, coupling, and isolation between the ports of power divider are evaluated to determine the design. Antenna array and the power divider network are mounted back to back on Aluminum plate. VSWR <2 over the band and isolation between outputs ports of power divider are critical design requirements.
Figure of merit of X‐type hexaferrite (Ba2Co2Fe28O46) for mobile antenna applications
Authors: Lee Woncheol , Hong Yang‐Ki , Choi Minyeong , Won Hoyun , Lee Jaejin , Jung Myung‐Hwa , Bae Seok 
Published: February 2018

AbstractWe report a Ba2Co2Fe28O46 (Co2X) hexaferrite, which has a high figure of merit (FOM = μ′/tan δμ) over the frequency range from 800 MHz to 1 GHz. The Co2X hexaferrite was prepared by the conventional solid‐state reaction. The calcined and sintered Co2X hexaferrites were characterized with a vibrating sample magnetometer and an impedance analyzer for their static and dynamic magnetic properties. The sintered Co2X hexaferrite shows 67.3 emu/g of saturation magnetization, 10.5 kOe of anisotropy field, and 0.03 of low magnetic loss tangent with relatively high permeability of 2.07 at 1 GHz, resulting in FOM of 69. This is the highest FOM among the reported microwave magnetic materials over the frequency range from 800 MHz to 1 GHz, which has not been previously reported. Therefore, the developed Co2X hexaferrite is suitable for antenna applications at the low‐frequency bands of mobile wireless communications.
Flow MRI simulation in complex 3D geometries: Application to the cerebral venous network
Authors: Fortin Alexandre , Salmon Stéphanie , Baruthio Joseph , Delbany Maya , Durand Emmanuel 
Published: February 2018

PurposeDevelop and evaluate a complete tool to include 3D fluid flows in MRI simulation, leveraging from existing software. Simulation of MR spin flow motion is of high interest in the study of flow artifacts and angiography. However, at present, only a few simulators include this option and most are restricted to static tissue imaging.Theory and methodsAn extension of JEMRIS, one of the most advanced high performance open‐source simulation platforms to date, was developed. The implementation of a Lagrangian description of the flow allows simulating any MR experiment, including both static tissues and complex flow data from computational fluid dynamics. Simulations of simple flow models are compared with real experiments on a physical flow phantom. A realistic simulation of 3D flow MRI on the cerebral venous network is also carried out.ResultsSimulations and real experiments are in good agreement. The generality of the framework is illustrated in 2D and 3D with some common flow artifacts (misregistration and inflow enhancement) and with the three main angiographic techniques: phase contrast velocimetry (PC), time‐of‐flight, and contrast‐enhanced imaging MRA.ConclusionThe framework provides a versatile and reusable tool for the simulation of any MRI experiment including physiological fluids and arbitrarily complex flow motion.
Delivery of adipose‐derived stem cells in poloxamer hydrogel improves peripheral nerve regeneration
Authors: Allbright Kassandra O. , Bliley Jacqueline M. , Havis Emmanuelle , Kim Deok‐Yeol , Dibernardo Gabriella A. , Grybowski Damian , Waldner Matthias , James Isaac B. , Sivak Wesley N. , Rubin J. Peter , Marra Kacey G. 
Published: February 2018

ABSTRACTIntroduction: Peripheral nerve damage is associated with high long‐term morbidity. Because of beneficial secretome, immunomodulatory effects, and ease of clinical translation, transplantation with adipose‐derived stem cells (ASC) represents a promising therapeutic modality. Methods: Effect of ASC delivery in poloxamer hydrogel was assessed in a rat sciatic nerve model of critical‐sized (1.5 cm) peripheral nerve injury. Nerve/muscle unit regeneration was assessed via immunostaining explanted nerve, quantitative polymerase chain reaction (qPCR), and histological analysis of reinnervating gastrocnemius muscle. Results: On the basis of viability data, 10% poloxamer hydrogel was selected for in vivo study. Six weeks after transection and repair, the group treated with poloxamer delivered ASCs demonstrated longest axonal regrowth. The qPCR results indicated that the inclusion of ASCs appeared to result in expression of factors that aid in reinnervating muscle tissue. Discussion: Delivery of ASCs in poloxamer addresses multiple facets of the complexity of nerve/muscle unit regeneration, representing a promising avenue for further study. Muscle Nerve 58: 251–260, 2018
BFGS‐like updates of constraint preconditioners for sequences of KKT linear systems in quadratic programming
Authors: Bergamaschi L. , De Simone V. , di Serafino D. , Martínez A. 
Published: February 2018

SummaryWe focus on efficient preconditioning techniques for sequences of Karush‐Kuhn‐Tucker (KKT) linear systems arising from the interior point (IP) solution of large convex quadratic programming problems. Constraint preconditioners (CPs), although very effective in accelerating Krylov methods in the solution of KKT systems, have a very high computational cost in some instances, because their factorization may be the most time‐consuming task at each IP iteration. We overcome this problem by computing the CP from scratch only at selected IP iterations and by updating the last computed CP at the remaining iterations, via suitable low‐rank modifications based on a BFGS‐like formula. This work extends the limited‐memory preconditioners (LMPs) for symmetric positive definite matrices proposed by Gratton, Sartenaer and Tshimanga in 2011, by exploiting specific features of KKT systems and CPs. We prove that the updated preconditioners still belong to the class of exact CPs, thus allowing the use of the conjugate gradient method. Furthermore, they have the property of increasing the number of unit eigenvalues of the preconditioned matrix as compared with the generally used CPs. Numerical experiments are reported, which show the effectiveness of our updating technique when the cost for the factorization of the CP is high.
Comparison of bronchoscopy and bronchoalveolar lavage findings in three types of suppurative lung disease
Authors: de Vries Jorrit J. V. , Chang Anne B. , Marchant Julie M. 
Published: February 2018

AbstractBackgroundEndobronchial suppuration is present in children with protracted bacterial bronchitis (PBB), bronchiectasis, and cystic fibrosis (CF). However, no studies have directly compared bronchoscopy and bronchoalveolar lavage (BAL) findings across these conditions within a single center using the same techniques and with shared community pathogens.AimTo determine; (i) the bronchoscopic findings and BAL microbiology and cellularity among children with these conditions and; (ii) the relationship between bacterial pathogens, airway cellularity and aberrant macroscopic bronchoscopic findings.MethodsWe retrospectively reviewed all bronchoscopy data (undertaken over 6.5‐years) from our center in children (<6 years; n = 316) meeting definitions of PBB (n = 125), bronchiectasis (n = 138), and CF (n = 53).ResultsThe children's median age was 26‐months (Interquartile range (IQR) = 16‐43). Children with PBB and bronchiectasis had higher rates of Haemophilus influenzae, Moraxella catarrhalis, and Streptococcus pneumoniae infection, whereas children with CF had frequent Pseudomonas aeruginosa and Staphylococcus aureus infections. Novel findings include detection of cytomegalovirus and Epstein‐Barr virus (EBV) (by polymerase chain reaction) in children with PBB (26%, 17%, respectively) and bronchiectasis (27%, 29%). Median airway neutrophil percentage was significantly higher in CF (68%; IQR = 42‐83) compared to PBB (36%; IQR = 18‐68) and bronchiectasis (22%; IQR = 8‐64) (P < 0.0001), despite lower rates of infection. Presence of malacia did not significantly impact on infection or inflammation.ConclusionIn this first study to directly compare bronchoscopic data among young children with PBB, bronchiectasis, and CF, microbiological patterns of airway infections and neutrophilia varied. Our findings of cytomegalovirus and EBV detection in children with PBB and bronchiectasis require confirmation and further evaluation.
The impact of staffing model in a 6‐day rehabilitation physiotherapy service
Authors: Caruana E. L. , Kuys S.S. , Clarke J. , Brauer S.G. 
Published: February 2018

AbstractBackground and PurposeThe impact of staffing model providing weekend physiotherapy rehabilitation has not been evaluated. This study aims to determine the impact of staffing a weekend rehabilitation service with physiotherapists currently working in rehabilitation compared to acute hospital physiotherapists, on length of stay (LOS), functional independence and gait and balance, and to determine the impact on neurological, orthopaedic, and reconditioning diagnostic groups.MethodsA prospective cohort study with historical control was completed in a private, metropolitan Australian rehabilitation unit. All participants admitted to the rehabilitation unit over two, 20‐week periods in 2011 and 2012 were included. Weekend physiotherapy was provided by physiotherapists working in rehabilitation in 2012 (intervention) and physiotherapists working in the acute wards in 2011 (control). Outcomes included LOS, Functional Independence Measure (FIM), and gait and balance measures.ResultsOverall, there were 504 participants; 234 in 2012 and 270 in 2011. No difference was found in LOS between staffing models (mean difference−1.5 days, 95%CI −4.4 to 1.3). Greater FIM change (mean difference 3.5, 95%CI 0.3 to 6.7) and efficiency (FIM change/LOS: mean difference 0.3, 95%CI 0.1 to 0.5) were found with rehabilitation compared to acute staffing. There was no between‐group difference in gait or balance performance. When diagnostic groups were compared, no difference in LOS was found between staffing models. Participants with an orthopaedic diagnosis had a significantly greater FIM change (mean difference 3.8, 95%CI 0.4 to 7.1), whereas FIM efficiency was improved in neurological (mean difference 0.4, 95%CI 0.1 to 0.7) and orthopaedic populations (mean difference 0.3, 95%CI 0.03 to 0.5) with rehabilitation staffing.DiscussionStaffing a weekend rehabilitation service with physiotherapists currently working in rehabilitation influences functional independence. Different diagnostic groups appear to respond differently.
An orbital localization criterion based on the topological analysis of the electron localization function at correlated level
Authors: Alcoba Diego R. , Oña Ofelia B. , Torre Alicia , Lain Luis , Tiznado William 
Published: February 2018

AbstractThis work describes a procedure for localizing orbitals based on the topological analysis of the electron localization function at correlated level. The decomposition of the overlap matrix according to the partitioning of the three dimensional physical space into basins provided by that function allows us to define a localization index to be maximized using isopycnic orbital transformations. The localization algorithm has been computationally implemented and its efficiency tested on selected molecular systems at equilibrium, stretched, and twisted geometries. We report results which allow to analyze the influence of the correlated and uncorrelated treatments on the orbital localization.
Synthesis and Immobilization of Benzothiazole‐Appended Triazole‐Silane: Biological Evaluation and Molecular Docking Approach
Authors: Singh Gurjaspreet , Chowdhary Kavita , Satija Pinky , Singh Akshpreet , Singh Baljinder , Singh Kashmir , Espinosa Cristóbal , Esteban M. Angeles , Sehgal Rakesh , Verma Vikas 
Published: February 2018

AbstractThe present work involves the synthesis of Benzothiazole capped triazole‐silane (3) by ‘Click Silylation’ and its immobilization onto silica surface. This new silane is characterised by IR, 1H, 13C spectroscopy. TGA, TEM and SEM were the evidence for its adsorption at silica surface. The anti‐parasitic, anti bacterial and anti oxidant activity of synthesised compounds was evaluated. The results shows that nanoparticle of silane displayed more significant activity as compared to benzothiazole derived silane (3) against G. lamblia, T. vaginalis, various bacterial strains (E.coli, Bacillus subtillus, Staphylococcus aureus, Vibrio cholera) and showed potential anti‐oxidant activity. Further Molecular docking study was performed to analyse the binding manner and enzyme inhibitory activity of compound‐3 with β‐glucuronidase.
A Sustainable Synthesis of Functionalized Pyrrole Fused Coumarins under Solvent‐Free Conditions Using Magnetic Nanocatalyst and a New Route to Polyaromatic Indolocoumarins
Authors: Mukherjee Sayan , Sarkar Soumen , Pramanik Animesh 
Published: February 2018

AbstractA general and environmentally benign one‐pot method has been developed for the library synthesis of biologically important chromeno[4, 3‐b]pyrrol‐4(1H)‐one derivatives. A three‐component domino condensation of 4‐aminocoumrins, arylglyoxal monohydrates and various nucleophilic substrates, such as, arylamines, malononitrile, ethyl cyanoacetate and cyanoacetamide produced functionalized chromeno[4, 3‐b]pyrrol‐4(1H)‐ones in presence of magnetically separable Fe3O4@SiO2‐SO3H nanoparticles as solid acid catalyst under solvent free conditions. Furthermore, a two‐component condensation of 4‐aminocoumrins and arylglyoxal monohydrates furnished a series of hydroxy functionalized chromeno[4, 3‐b]pyrrol‐4(1H)‐ones under similar reaction conditions. The salient features of the present method are mild reaction conditions, reduced reaction time, elimination of hazardous solvents, good yield of the products, greater substrate scope and use of a magnetically separable and recyclable nanocatalyst. Moreover, it has been observed that a class of chromeno[4, 3‐b]pyrrol‐4(1H)‐one derivatives can be easily converted to biologically important indolo[3, 2‐c]coumarin derivatives in good yield through intramolecular thermal cyclization without using any catalyst.
Direct Aerobic Strategy for Synthesis of Imines via Alcohols and Amines Promoted by Ruthenium(II) (η6‐p‐cymene) Complexes
Authors: Manikandan Thimma Sambamoorthy , Ramesh Rengan , Shivalingegowda Naveen , Krishnappagowda Lokanath Neratur 
Published: February 2018

AbstractNeutral ruthenium(II) p‐cymene complexes were synthesised by complexation of [Ru(η6‐p‐cymene)(μ‐Cl)Cl]2 with substituted methyl‐2‐pyrrolyl ketone benzhydrazone ligands in good yields. The characterization of the synthesised complexes was accomplished by analytical and spectroscopic techniques (FT‐IR, UV‐Vis, NMR, and ESI‐MS). Crystal structures of two of the complexes exhibited that the hydrazone ligand was bonded to ruthenium ion in a bidentate fashion via imine nitrogen and imidolate oxygen and witnessed ruthenium centered pseudo‐octahedral geometry. The catalytic feasibility of these Ru(II) complexes was explored for the direct aerobic synthesis of imine from the coupling of alcohols and amines in toluene medium with Cs2CO3 as a base without molecular sieves or any additives. The scope and versatility of the present catalytic system were performed with the diverse range of alcohols and amines such as primary/secondary aromatic, aliphatic, heteroaromatic, cyclic as well as chiral substrates under open atmospheric condition. Further, the tolerance of steric and electronic effects on substrates was evaluated. Besides, the effect of promoters on the reaction including solvents, bases, temperatures and catalyst loading was carried out as well.