bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dual‐band dual‐polarized antenna for WLAN applications
Authors: Row Jeen‐Sheen , Huang You‐Jhih 
Published: December 2017

AbstractA new design for antennas with dual‐band and dual‐polarization operations is described. The design uses a stacked structure that is composed of a lower microstrip antenna and an upper crossed‐dipole antenna. The microstrip antenna, excited with two orthogonal probe feeds, is operated at the lower frequency band, and the crossed‐dipole antenna, excited with a pair of coaxial baluns, is operated at the higher frequency band. Experimental results demonstrate that the 10 dB‐return‐loss impedance bandwidths of the two antennas can cover the frequency bands from 2.4 to 2.48 GHz and from 5.15 to 5.85 GHz, respectively. Moreover, for each antenna, the isolation between the orthogonal input ports is larger than 30 dB and the cross polarization level is around −20 dB. Simulation results obtained with HFSS are also provided, and they have good agreements with the measured results.
A compact and broadband dielectric image line based antenna array in planar environment
Authors: Prasad Chandra Shekhar , Biswas Animesh , Akhtar M. Jaleel 
Published: December 2017

AbstractIn this letter, a compact, planar, dielectric image line (DIL) based 4‐elements antenna array is proposed in Ku‐band. Ansoft HFSS is used to design and optimize antenna array. The measured impedance bandwidth and peak realized gain are 33.33% and 18.1 dBi at 15 GHz for 1λ0 long DIL rod, respectively.
Broadband circularly polarized printed monopole antenna with protruded L‐shaped and inverted L‐shaped strips
Authors: Chandu D. S. , Karthikeyan S. S. 
Published: December 2017

AbstractA novel approach in the design of broadband circularly polarized antennas is presented in this article. The design uses a simple monopole structure with a triangular tapered feed. Right‐/left‐hand circular polarization (CP) is achieved by protruding L‐shaped strip and inverted L‐shaped strip along the left/right radiating edge of the monopole. It is proposed that the 3‐dB axial ratio bandwidth (AR‐BW) can be enhanced when the length of these strips is equal to λg/4 at the center frequency of their respective CP bands. This principle is verified by fabricating the prototype on 1 mm thick FR4 substrate occupying a compact area of 0.19 λ0 × 0.19 λ0. From the measurement results, it is observed that the overlapped bandwidth (S11 ≤ −10 dB and AR ≤ 3 dB) of the antenna is 129.04% (1.38–6.4 GHz) which covers all the major WLAN bands including the WiMAX. The proposed antenna has bi‐directional radiation characteristics with a broadside gain of 3.49 dBic in the CP band.
Cardiac MR elastography using reduced‐FOV, single‐shot, spin‐echo EPI
Authors: Sui Yi , Arunachalam Shivaram P. , Arani Arvin , Trzasko Joshua D. , Young Phillip M. , Glockner James F. , Glaser Kevin J. , Lake David S. , McGee Kiaran P. , Manduca Armando , Rossman Phillip J. , Ehman Richard L. , Araoz Philip A. 
Published: December 2017

PurposeTo implement a reduced field of view (rFOV) technique for cardiac MR elastography (MRE) and to demonstrate the improvement in image quality of both magnitude images and post‐processed MRE stiffness maps compared to the conventional full field of view (full‐FOV) acquisition.MethodsWith Institutional Review Board approval, 17 healthy volunteers underwent both full‐FOV and rFOV cardiac MRE scans using 140‐Hz vibrations. Two cardiac radiologists blindly compared the magnitude images and stiffness maps and graded the images based on several image quality attributes using a 5‐point ordinal scale. Fisher's combined probability test was performed to assess the overall evaluation. The octahedral shear strain‐based signal‐to‐noise ratio (OSS‐SNR) and median stiffness over the left ventricular myocardium were also compared.ResultsOne volunteer was excluded because of an inconsistent imaging resolution during the exam. In the remaining 16 volunteers (9 males, 7 females), the rFOV scans outperformed the full‐FOV scans in terms of subjective image quality and ghosting artifacts in the magnitude images and stiffness maps, as well as the overall preference. The quantitative measurements showed that rFOV had significantly higher OSS‐SNR (median: 1.4 [95% confidence interval (CI): 1.2–1.5] vs. 2.1 [95% CI: 1.8–2.4]), P < 0.05) compared to full‐FOV. Although no significant change was found in the median myocardial stiffness between the 2 scans, we observed a decrease in the stiffness variation within the myocardium from 2.1 kPa (95% CI: [1.9, 2.3]) to 1.9 kPa (95% CI: [1.7, 2.0]) for full‐FOV and rFOV, respectively (P < 0.05) in a subgroup of 7 subjects with ghosting present in the myocardium.ConclusionThis pilot volunteer study demonstrated that rFOV cardiac MRE has the capability to reduce ghosting and to improve image quality in both MRE magnitude images and stiffness maps. Magn Reson Med 80:231–238, 2018. © 2017 The Authors Magnetic Resonance in Medicine published by Wiley Periodicals, Inc. on behalf of International Society for Magnetic Resonance in Medicine. This is an open access article under the terms of the Creative Commons Attribution NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Prestructuring sparse matrices with dense rows and columns via null space methods
Authors: Howell Jason S. 
Published: December 2017

SummarySeveral applied problems may produce large sparse matrices with a small number of dense rows and/or columns, which can adversely affect the performance of commonly used direct solvers. By posing the problem as a saddle point system, an unconventional application of a null space method can be employed to eliminate dense rows and columns. The choice of null space basis is critical in retaining the overall sparse structure of the matrix. A new one‐sided application of the null space method is also presented to eliminate either dense rows or columns. These methods can be considered techniques that modify the nonzero structure of the matrix before employing a direct solver and may result in improved direct solver performance.
A novel bio‐based phthalonitrile resin derived from catechin: synthesis and comparison of curing behavior with petroleum‐based counterpart
Authors: Qi Yu , Weng Zhihuan , Wang Jinyan , Zhang Shouhai , Zong Lishuai , Liu Cheng , Jian Xigao 
Published: December 2017

AbstractThe development of bio‐based thermosetting resins with good thermal stability can potentially afford sustainable polymers as replacements for petroleum‐based polymers. We report a practical route to a novel catechin‐based phthalonitrile resin precursor (CA‐Ph), which contains free phenolic hydroxyl groups that result in ‘self‐curing’ at elevated temperatures to afford a thermostable polymer. Comparison of the performance of this CA‐Ph resin with that of a conventional petroleum‐based bisphenol A phthalonitrile resin (BPA‐Ph; containing 5 wt% of the curing agent 4,4′‐diaminodiphenylsulfone) revealed that CA‐Ph exhibits a lower melting point and curing temperature. Cured CA‐Ph resin retains 95% of its weight at 520 °C under a nitrogen atmosphere, which compares favorably with results obtained for BPA‐Ph resin that retains 95% of its weight at a lower temperature of 484 °C. Kinetic results indicated that the curing reactions of both CA‐Ph and BPA‐Ph systems follow an autocatalytic mechanism. These results suggest that catechin is a useful bio‐based feedstock for the preparation of self‐curing and thermally stable phthalonitrile resins for advanced technological applications. © 2017 Society of Chemical Industry
Characterizing aquatic habitats for long‐term monitoring of a fourth‐order, regulated river in the Pacific Northwest, USA
Authors: Konrad C.P. , Burton K. , Little R. , Gendaszek A.D. , Munn M.D. , Anderson S.W. 
Published: December 2017

AbstractA pragmatic approach to the long‐term monitoring of rivers leverages available information with targeted field investigations to address key uncertainties relevant to management decisions. An over‐arching management issue for many rivers is how reservoir operation affects the amount and location of in‐channel sediment and the resulting distribution of aquatic habitats. We integrate remotely acquired and field‐survey morphologic data for the Cedar River, Washington, to constitute the current status of aquatic habitats and benchmarks for long‐term monitoring that will inform streamflow management. Four key habitats (river edge, side channels, riffles, and pools) are feasible to monitor with high‐resolution aerial imagery, a longitudinal profile of the river, and a side channel inventory, but full characterization of the functional differences within these habitats requires additional information. Habitat use information such as redd surveys will continue to be important for long‐term monitoring where it cannot be inferred reliably from physical habitat characteristics.
Elucidation of the Structure and Fluxionality of a Dinuclear Organometallic Complex Reluctant to Crystallize: An Experimental and Theoretical Integrated Approach
Authors: Loffi Cecilia , Rogolino Dominga , Verdolino Vincenzo , Pelagatti Paolo 
Published: December 2017

AbstractThe organometallic dication 12+ has been constructed by combining the angular py‐functionalized ligand N,N′‐bis‐(3‐aminopyridine)‐1,4,5,8‐naphthalenetetracarboxydiimide (L) with [(p‐cymene)RuCl] moieties. In 12+ two ligands L bridge two organometallic nodes. Repeated crystallization attempts of 12+ failed and then a combined DFT/VT‐1H NMR/UV‐Vis spectroscopy study has been performed to define the most plausible structure of the dication. These considers the two naphthalenediimide platforms unstacked, thus giving rise to a very open conformation where the two chloride and the two p‐cymene ligands lye on the same side of the cationic cleft. The high fluxionality of 12+ evidenced by 1H NMR spectroscopy has been elucidated by a combined PES (Potential Energy Surface)/MD (Molecular Dynamic)/DFT‐GIAO (Gauge Including Atomic Orbitals) study, thus furnishing a detailed description of the dynamic character of 12+.
β‐Cyclodextrin‐Monosulphonic Acid Catalyzed Efficient Synthesis of 1‐Amidoalkyl‐2‐naphthols
Authors: Madankumar Natarajan , Pitchumani Kasi 
Published: December 2017

AbstractAn efficient and rapid approach for the synthesis of 1‐amidoalkyl‐2‐naphthols catalyzed by β‐cyclodextrin‐monosulphonic acid under solvent‐free conditions is described. The catalyst can be prepared easily from readily available β‐cyclodextrin in a single step procedure and is characterized by ESI‐Mass (Electrospray Ionization‐Mass), elemental analysis and TGA (Thermogravimetric analysis). Totally 29 compounds are prepared from various aromatic aldehydes, amides and 2‐naphthol using this β‐cyclodextrin‐monosulphonic acid indicating the broad substrate scope of this method. The key benefits of this atom economical method comprise a simple and a single step preparation of the catalyst, shorter reaction time (6‐20 minutes), good to excellent yields (72‐96%), mild reaction conditions, wide range of functional group tolerance, absence of any tedious workup or purification, it avoids hazardous reagents/solvents and reusable upto five runs. A suitable reaction mechanism which is supported by energy minimization studies, is proposed.
The Case of 4‐Vinyl‐1,3‐dioxolane‐2‐one: Determination of Its Pseudo‐Living Behavior and Preparation of Allyl Carbonate‐Styrene Co‐Polymers
Authors: Sabatini Valentina , Gazzotti Stefano , Farina Hermes , Camazzola Stefano , Ortenzi Marco A. 
Published: December 2017

AbstractThis article describes for the first time the pseudo‐living radical activity of 4‐vinyl‐1,3‐dioxolane‐2‐one (VEC) monomer towards a free radical homo‐polymerization: a kinetic study of VEC homo‐polymerization was performed up to 168 hours and it was found that molecular weights, determined via gel permeation chromatography (GPC), and VEC conversion, measured via 1H NMR spectroscopy, continue to grow over time showing a molecular weights distribution typical of pseudo‐living polymerizations.Until today, in co‐polymerization with styrene, just a few VEC moieties could be inserted into VEC‐styrene co‐polymers; in this work VEC controlled radical activity allows, for the first time, the synthesis of di‐block co‐polymers between styrene and vinyl groups bearing cyclic carbonate functionalities that can be used for further cross‐linking reactions. VEC‐styrene co‐polymers were synthesized with different molar ratios between co‐monomers and characterized by GPC analyses and 1H NMR spectra; excellent reaction yields and solubility in apolar solvents were obtained.
Intercalating 0.3 nm Single‐Walled Carbon Nanotubes in Channels of SAPO‐11 Crystals: Structural Changes
Authors: Zhai Jianpang , Fang Ruiyang , Jian Dunliang , Wang Qiangbing , Ruan Shuangchen , Li Irene Ling 
Published: December 2017

AbstractX‐ray powder diffraction, single crystal X‐ray diffraction and Raman spectra were used to investigate the influence of water adsorption and the intercalating of 0.3 nm single‐walled carbon nanotubes (SWNTs) on a Si‐substituted AlPO4‐11 (SAPO‐11) crystal structure. Calcined SAPO‐11 crystal adsorbs water at room temperature, which results in significant structural changes because of the interactions between the moisture and the crystal lattice. However, there is no space for the existence of moisture when 0.3 nm SWNTs are intercalated in the channels of SAPO‐11 crystals. As a result, the crystal symmetry remains unchanged upon hydration. An increase in the structure collapse of the 0.3‐nm SWNTs results in more moisture molecules being captured inside the channels, which results in structural distortion. The channels become more elliptical, which leads to an increased interaction between the 0.3‐nm SWNTs and crystal channels, as evidenced by the blue shift of the radial breathing modes (RBM) in the Raman spectra.
Catalytic Oxidation of Biosourced 3‐Methylphtalic Anhydride under O2: One‐Pot Hemimellitic Acid Synthesis and Novel Example of Biomass Valorization.
Authors: Giorgi Pascal D. , Soo‐Tang Siu‐Ha , Antoniotti Sylvain , van der Waal Jan C. 
Published: December 2017

AbstractAn original one pot/two steps scalable catalytic reaction was developed for the synthesis of hemimellitic acid from biobased 3‐methylphtalic anhydride. This novel approach, involving an anhydride function as a masked 1,2‐dicarboxylic acid moiety, allowed circumventing undesired complexation issues of intermediates with catalytically active metal species and thereby requalify Co/Mn/Br catalytic system under O2 in relatively mild conditions.
Inorganic, Hybridized and Living Macrocellular Foams: “Out of the Box” Heterogeneous Catalysis
Authors: Roucher Armand , Depardieu Martin , Pekin Deniz , Morvan Mickaël , Backov Rénal 
Published: December 2017

AbstractWith this personal account we show how the Integrative Chemistry, when combining the sol‐gel process and concentrated emulsions, allows to trigger inorganic, hybrid or living materials when dedicated toward heterogeneous catalysis applications. In here we focus on 3D‐macrocellular monolithic foams bearing hierarchical porosities and applications thereof toward heterogeneous catalysis where both activities and mass transport are enhanced. We thereby first depict the general background of emulsions, focusing on concentrated ones, acting as soft templates for the design of solid (HIPE) foams, HIPE being the acronym for High Internal Phase Emulsions while encompassing both sol‐gel and polymer chemistry. Secondly we extend this approach toward the design of inorganic cellular materials labeled Si(HIPE) and hybrid organic‐inorganic foams, labeled Organo‐Si(HIPE), where heterogeneous catalysis applications are addressed considering acidic, metallic, enzymatic and bacterial‐based modified Si‐HIPE. Along, we will show how the fluid hydrodynamic within the macrocellular foams is offering advanced “out of the box” heterogeneous catalytic capabilities.
Longitudinal relations between adolescents' materialism and prosocial behavior toward family, friends, and strangers
Authors: Yang Zhixu , Fu Xinyuan , Yu Xiaoxia , Lv Yichen 
Published: December 2017

ABSTRACTThe present study examines the short‐term changes and longitudinal relations between adolescents' materialism and prosocial behavior toward family, friends, and strangers over a year. A total of 434 Chinese adolescents (mean age at Time 1 = 11.27; 54% girls) participated in the two time points. From 6th grade to 7th grade, boys' and girls' materialism increased, whereas their prosocial behavior toward family, friends, and strangers declined, despite the stable trend in boys' prosocial behavior toward strangers. Furthermore, a cross‐lagged model was conducted and the results showed that, adolescent materialism was associated longitudinally with decreased prosocial behavior toward friends and strangers, but not toward family. However, earlier prosocial behavior toward family, friends, and strangers were not associated with subsequent adolescent materialism. The findings point toward an understanding of materialism as a precursor rather than an outcome or byproduct to prosocial behavior.
Preliminary Evidence for an Association Between Variants of the Catechol-O-Methyltransferase (COMT) Gene and Premature Ejaculation
Authors: Jern Patrick , Johansson Ada , Strohmaier Jana , Treutlein Jens , Piha Juhana , Rietschel Marcella 
Published: December 2017

Abstract

Background
Studies have suggested that dopamine plays a role in the neurobiological mechanism that triggers ejaculation, leading scientists to hypothesize that dopamine-related genetic polymorphisms could contribute to symptoms of premature ejaculation (PE).

Aim
To investigate associations between dopamine receptor and catechol-O-methyltransferase (COMT; an enzyme involved in the catabolism of dopamine) gene-linked polymorphisms and PE.

Methods
PE status in patient groups was determined by clinical diagnosis performed by a physician specializing in sexual medicine. Self-reported PE symptoms from a validated questionnaire also were reported. Saliva samples were collected from 149 patients with PE and 1,022 controls from a population-based sample. In total, we tested associations between PE and 11 single-nucleotide polymorphisms in the dopamine receptor D1, D2, and D3 genes and in the COMT gene.

Outcomes
We found no associations between dopamine receptor gene polymorphisms and PE, but 2 COMT-linked loci (rs4680 and rs4818) had significant associations after correction for multiple testing.

Results
1 COMT gene-linked locus that was associated with PE symptoms in the present study, rs4680, is a well-documented functional polymorphism that causes a valine-to-methionine substitution. The other polymorphism, rs4818, is in high linkage disequilibrium with the rs4680 locus, indicating that they capture the same effect. Surprisingly, the rs4680 variant that was statistically significantly more prevalent in the PE group (ie, the valine-encoding allele) has been associated with higher enzymatic activity and therefore lower synaptic dopamine levels.

Clinical Translation
Drugs targeting the dopaminergic system could affect PE symptoms.

Strengths and Limitations
No replication sample was available for the present study; thus, our findings should be interpreted with caution. Moreover, a limitation of our study is the small sample in the context of genetic association studies (although it should be mentioned that genetically informative samples with phenotypic information about PE symptoms are scarce, and most previous genetic association studies of PE have used samples of similar or smaller size). However, our results are plausible: we report an association between one of the most extensively studied and understood genetic polymorphisms in psychiatric research and PE, and our results are in line with the long-standing hypothesis that dopamine influences human ejaculatory function.

Conclusions
We report an association between 2 COMT gene-linked loci and PE symptoms, but our results should be treated with caution until independently replicated.
Controlled spin switching in a metallocene molecular junction
Authors: Ormaza M. , Abufager P. , Verlhac B. , Bachellier N. , Bocquet M.-L. , Lorente N. , Limot L. 
Published: December 2017

AbstractThe active control of a molecular spin represents one of the main challenges in molecular spintronics. Up to now spin manipulation has been achieved through the modification of the molecular structure either by chemical doping or by external stimuli. However, the spin of a molecule adsorbed on a surface depends primarily on the interaction between its localized orbitals and the electronic states of the substrate. Here we change the effective spin of a single molecule by modifying the molecule/metal interface in a controlled way using a low-temperature scanning tunneling microscope. A nickelocene molecule reversibly switches from a spin 1 to 1/2 when varying the electrode–electrode distance from tunnel to contact regime. This switching is experimentally evidenced by inelastic and elastic spin-flip mechanisms observed in reproducible conductance measurements and understood using first principle calculations. Our work demonstrates the active control over the spin state of single molecule devices through interface manipulation.
Biomarkers of aging associated with past treatments in breast cancer survivors
Authors: Scuric Zorica , Carroll Judith E. , Bower Julienne E. , Ramos-Perlberg Sam , Petersen Laura , Esquivel Stephanie , Hogan Matt , Chapman Aaron M. , Irwin Michael R. , Breen Elizabeth C. , Ganz Patricia A. , Schiestl Robert 
Published: December 2017

AbstractRadiation and chemotherapy are effective treatments for cancer, but are also toxic to healthy cells. Little is known about whether prior exposure to these treatments is related to markers of cellular aging years later in breast cancer survivors. We examined whether past exposure to chemotherapy and/or radiation treatment was associated with DNA damage, telomerase activity, and telomere length 3–6 years after completion of primary treatments in breast cancer survivors (stage 0–IIIA breast cancer at diagnosis). We also examined the relationship of these cellular aging markers with plasma levels of Interleukin (IL)-6, soluble TNF-receptor-II (sTNF-RII), and C-reactive protein (CRP). Ninety-four women (36.4–69.5 years; 80% white) were evaluated. Analyses adjusting for age, race, BMI, and years from last treatment found that women who had prior exposure to chemotherapy and/or radiation compared to women who had previously received surgery alone were more likely to have higher levels of DNA damage (P = .02) and lower telomerase activity (P = .02), but did not have differences in telomere length. More DNA damage and lower telomerase were each associated with higher levels of sTNF-RII (P’s < .05). We found that exposure to chemotherapy and/or radiation 3–6 years prior was associated with markers of cellular aging, including higher DNA damage and lower telomerase activity, in post-treatment breast cancer survivors. Furthermore, these measures were associated with elevated inflammatory activation, as indexed by sTNF-RII. Given that these differences were observed many years after the treatment, the findings suggest a long lasting effect of chemotherapy and/or radiation exposure.