bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Bright Future of Unconventional σ/π‐Hole Interactions
Authors: Bauzá Antonio , Mooibroek Tiddo J. , Frontera Antonio 
Published: June 2015

AbstractNon‐covalent interactions play a crucial role in (supramolecular) chemistry and much of biology. Supramolecular forces can indeed determine the structure and function of a host–guest system. Many sensors, for example, rely on reversible bonding with the analyte. Natural machineries also often have a significant non‐covalent component (e.g. protein folding, recognition) and rational interference in such ‘living’ devices can have pharmacological implications. For the rational design/tweaking of supramolecular systems it is helpful to know what supramolecular synthons are available and to understand the forces that make these synthons stick to one another. In this review we focus on σ‐hole and π‐hole interactions. A σ‐ or π‐hole can be seen as positive electrostatic potential on unpopulated σ* or π(*) orbitals, which are thus capable of interacting with some electron dense region. A σ‐hole is typically located along the vector of a covalent bond such as XH or XHlg (X=any atom, Hlg=halogen), which are respectively known as hydrogen and halogen bond donors. Only recently it has become clear that σ‐holes can also be found along a covalent bond with chalcogen (XCh), pnictogen (XPn) and tetrel (XTr) atoms. Interactions with these synthons are named chalcogen, pnigtogen and tetrel interactions. A π‐hole is typically located perpendicular to the molecular framework of diatomic π‐systems such as carbonyls, or conjugated π‐systems such as hexafluorobenzene. Anion–π and lone‐pair–π interactions are examples of named π‐hole interactions between conjugated π‐systems and anions or lone‐pair electrons respectively. While the above nomenclature indicates the distinct chemical identity of the supramolecular synthon acting as Lewis acid, it is worth stressing that the underlying physics is very similar. This implies that interactions that are now not so well‐established might turn out to be equally useful as conventional hydrogen and halogen bonds. In summary, we describe the physical nature of σ‐ and π‐hole interactions, present a selection of inquiries that utilise σ‐ and π‐holes, and give an overview of analyses of structural databases (CSD/PDB) that demonstrate how prevalent these interactions already are in solid‐state structures.
Utilizing Benign Oxidants for Selective Aerobic Oxidations Using Heterogenized Platinum Nanoparticle Catalysts
Authors: Hinde Christopher S. , Gill Arran M. , Wells Peter P. , Hor T. S. Andy , Raja Robert 
Published: June 2015

AbstractBy using platinum nanoparticle catalysts that are generated in situ by extrusion from a porous copper chlorophosphate framework, the role of oxidants in the selective oxidation of benzyl alcohol to benzaldehyde was evaluated, with a view to establishing structure–property relationships. With a detailed study of the kinetic properties of the oxidation reaction, it has been determined that the aerobic oxidation pathways progress with lower levels of product selectivity and higher activation energies (72.4 kJ mol−1) than the peroxide‐based ones (23.6 kJ mol−1); affording valuable insights in the design of solid catalysts for selective oxidation reactions. Furthermore, through the use of X‐ray absorption spectroscopy, the effect of calcination temperature on the degree of extrusion and its influence on nanoparticle formation have been evaluated, leading to the establishment of structure–activity correlations between the observed activation energies and the proportion of nanoparticle species generated.
Experiences of Detention under the Mental Health Act for Adults with Anorexia Nervosa
Authors: Seed Tara , Fox John , Berry Katherine 
Published: June 2015

People with Anorexia Nervosa are often resistant to treatment and can be detained under the Mental Health Act. Detention can be distressing for some client groups; however, there is little research to explore how people with Anorexia Nervosa experience detention and how these experiences impact on recovery. This study utilized a qualitative methodology to develop a model for understanding how people perceive, experience and process detention under the Mental Health Act. Data from 12 participants was analysed using constructivist grounded theory. Four overarching categories conceptualize their experience over time: ‘the battle’, ‘the bubble’, ‘stepping out of the bubble’ and ‘the anorexic self’. Within each overarching category are further subordinate categories that represent the nuances of the data. The resultant model is discussed in relation to the literature, whilst recommendations have been made to embed person‐centred, recovery practice into inpatient services. Copyright © 2015 John Wiley & Sons, Ltd.Key Practitioner Message

People detained under the mental health act with anorexia nervosa often respond by engaging in a battle with clinicians.
This follows by the person withdrawing into a ‘bubble’ where the individual starts to feel some relief that they are no longer in control of their eating, but this competes with the lack of self and the emerging anorexic self.
Clinicians need to be aware that individuals detained may have mixed feelings about their hospital admission.
Synthesis of kesterite nanopowders with bandgap tuning ligands
Authors: Podsiadlo Slawomir , Bialoglowski Maciej , Fadaghi Mohammad , Matyszczak Grzegorz , Kardas Kornelia , Dluzewski Piotr , Data Przemyslaw , Lapkowski Mieczyslaw 
Published: June 2015

A rapid development of solar cells has been observed within recent years. Semiconducting materials based on Cu2ZnSnS4 with the kesterite structure offer a promise of low‐cost and environmentally friendly solar cells. The energy gap of Cu2ZnSnS4, which is about 1.5 eV, can be optimized with addition of organic ligands. We report a method of obtaining kesterite nanopowders with grain diameter of approximately 5 nm via solution synthesis using metal chlorides and sulfur in oleylamine at 230 °C. The ligand exchange for diphenylamine upshifted the value of the bandgap to 2.2 eV, which makes it a promising material for an upper layer in tandem photovoltaic devices.
High Turnover Catalase Activity of a Mixed‐Valence MnIIMnIII Complex with Terminal Carboxylate Donors
Authors: Singh Reena , Haukka Matti , McKenzie Christine J. , Nordlander Ebbe 
Published: June 2015

AbstractThe neutral dimanganese(II,III) complex [Mn2(BCPMP)(OAc)2] [1; BCPMP3– = 2,6‐bis({(carboxymethyl)[(1‐pyridyl)methyl]amino}methyl)‐4‐methylphenolato] has been synthesized and characterized. The complex contains two terminal carboxylate donors. Complex 1 was found to be an effective catalyst for the disproportionation of H2O2 with high catalytic rate and a turnover number of 7500, the highest turnover reported to date for a catalase mimic. The rates and TON were significantly higher than recorded for a dicationic dimanganese(II,III) counterpart ([Mn2(BPBP)(OAc)2]·(ClO4)2, 2; BPBP– = 2,6‐bis{[bis(2‐pyridylmethyl)amino]methyl}‐4‐butylphenolato), which lacks the terminal carboxylate donors, suggesting that introduction of a terminal carboxylate donor improves activity. A well‐resolved 16‐line pattern obtained upon addition of H2O2 to complex 1 suggests involvement of an MnIIIMnIV species in the catalytic cycle.
Dynamic compression combined with SOX‐9 overexpression in rabbit adipose‐derived mesenchymal stem cells cultured in a three‐dimensional gradual porous PLGA composite scaffold upregulates HIF‐1α expression
Authors: Chen Xu , Li Jianjun , Wang Enbo , Zhao Qun , Kong Zhan , Yuan Xiangnan 
Published: June 2015

AbstractThere is considerable interest in how the fate of adipose‐derived stem cells is determined. Physical stimuli play a crucial role in skeletogenesis and in cartilage repair and regeneration. In the present study, we investigated the comparative and interactive effects of dynamic compression and SRY‐related high‐mobility group box gene‐9 (SOX‐9) on chondrogenesis of rabbit adipose‐derived stem cells in three‐dimensional gradual porous PLGA (polylactic‐co‐glycolic acid) composite scaffolds. Articular cartilage is stratified into zones delineated by characteristic changes in cellular, matrix, and nutritive components. As a consequence, biochemical and biomechanical properties vary greatly between the different zones, giving the tissue its unique structure and, thus, the ability to cope with extreme loading. The effects on development of the cartilage were examined using a combination of computational modeling to predict alterations in biophysical stimuli, detailed morphometric analysis of 3D digital representations. In addition, early chondrogenic differentiation was assessed via real‐time PCR of mRNA expression levels for bone‐ and cartilage‐specific gene markers. Our findings define the important role of dynamic compression combined with SOX‐9 overexpression duringin vitrogeneration of tissue‐engineering cartilage and suggest that a 3D gradual porous PLGA composite scaffold may benefit articular cartilage tissue engineering in cartilage regeneration for better force distribution. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 103A: 3886–3895, 2015.
Temperature responsive hydrogels enable transient three‐dimensional tumor cultures via rapid cell recovery
Authors: Heffernan John M. , Overstreet Derek J. , Srinivasan Sanjay , Le Long D. , Vernon Brent L. , Sirianni Rachael W. 
Published: June 2015

AbstractRecovery of live cells from three‐dimensional (3D) culture would improve analysis of cell behaviors in tissue engineered microenvironments. In this work, we developed a temperature responsive hydrogel to enable transient 3D culture of human glioblastoma (GBM) cells. N‐isopropylacrylamide was copolymerized with hydrophilic grafts and functionalized with the cell adhesion peptide RGD to yield the novel copolymer poly(N‐isopropylacrylamide‐co‐Jeffamine® M‐1000 acrylamide‐co‐hydroxyethylmethacrylate‐RGD), or PNJ‐RGD. This copolymer reversibly gels in aqueous solutions when heated under normal cell culture conditions (37°C). Moreover, these gels redissolve within 70 s when cooled to room temperature without the addition of any agents to degrade the synthetic scaffold, thereby enabling rapid recollection of viable cells after 3D culture. We tested the efficiency of cell recovery following extended 3D culture and were able to recover more than 50% of viable GBM cells after up to 7 days in culture. These data demonstrate the utility of physically crosslinked PNJ‐RGD hydrogels as a platform for culture and recollection of cells in 3D. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 17–25, 2016.
Culture and getting to yes : The linguistic signature of creative agreements in the United States and Egypt
Authors: Gelfand Michele Joy , Severance Laura , Lee Tiane , Bruss C. Bayan , Lun Janetta , Abdel‐Latif Abdel‐Hamid , Al‐Moghazy Asmaa Ahmed , Moustafa Ahmed Sally 
Published: June 2015

SummaryWe complement the dominant rational model of negotiation found in the West with a new honor model of negotiation found in many Arabic‐speaking populations and illustrate the linguistic processes that facilitate creativity in negotiation agreements in the United States and Egypt. Community samples (N = 136) were recruited in the United States and Egypt and negotiated an integrative bargaining task, Discount Marketplace. Analyses of categories of the Linguistic Inquiry and Word Count (LIWC) and our own newly developed honor dictionary illustrate that the same language that predicts integrative agreements in the United States, namely, that which is rational and logical (cognitive mechanisms, LIWC), actually backfires and hinders agreements in Egypt. Creativity in Egypt, by contrast, reflects an honor model of negotiating with language that promotes honor gain (i.e., moral integrity) and honor protection (i.e., image and strength). Theoretical and practical implications are discussed. Copyright © 2015 John Wiley & Sons, Ltd.
Corrosion Protection Efficiency of Bilayer Porphyrin‐Polyaniline Film Deposited on Carbon Steel
Authors: Popa Iuliana , Fagadar‐Cosma Eugenia , Taranu Bogdan‐Ovidiu , Birdeanu Mihaela , Fagadar‐Cosma Gheorghe , Taranu Ioan 
Published: June 2015

SummaryPolyaniline (PANI) based composites and multilayers as well as porphyrin derivatives have been previously reported as efficient anti‐corrosion coatings. In our studies, 5,10,15,20‐tetra(4‐methylphenyl)‐21H,23H‐porphyrin (TMP) was adsorbed on carbon steel surface before PANI electrodeposition, in order to improve the corrosion protection of PANI films on steel. The corrosion behavior of the TMP‐PANI bilayer carbon steel modified electrodes was investigated in 0.1 M H2SO4 solution using electrochemical tehniques. It was found that TMP‐PANI coatings can provide a good protection against carbon steel corrosion. The corrosion rate for the composite coated steel was significantly lower than that of the bare steel, and exhibited an inhibition efficiency of ∼80%.
Aryleneethynylene Trimers Bearing Calix[4]arenes: Synthesis, Optical Properties and Self‐Assembling Studies
Authors: Prata José V. , Barata Patrícia D. 
Published: June 2015

SummaryNew homoditopic bis‐calix[4]arene‐carbazole conjugates, armed with hydrophilic carboxylic acid functions at their lower rims, are disclosed. Evidence for their self‐association in solution was gathered from solvatochromic and thermochromic studies, as well as from gel‐permeation chromatography analysis. Their ability to function as highly sensitive sensors toward polar electron‐deficient aromatic compounds is demonstrated.
A compact stub‐loaded composite right/left‐handed resonator and its application in bandpass filters
Authors: Xu Kai‐Da , Zhang Yong‐Hong , Li Xue‐Shi , Ai Jing , Fan Yong , Joines William T. 
Published: June 2015

ABSTRACTA new compact stub‐loaded composite right/left‐handed (SL‐CRLH) resonator is presented for the first time. The resonance properties of the proposed SL‐CRLH resonator are deduced by odd‐ and even‐mode analysis method. Besides miniaturization and wide upper stopband, the bandpass filter (BPF) using SL‐CRLH resonator is found to have an additional advantage that the bandwidth can be tuned by the stub length. Based on the proposed resonator, two BPFs operating at 3.1 GHz with source‐load magnetic cross coupling are designed, fabricated, and tested. The good agreements between simulated and measured results validate the design concept. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1999–2002, 2015
A broadband LNA and mixer for digital video broadcasting applications using a 0.18‐μm CMOS process
Authors: Qiang Tian , Kim Eun Seong , Wang Cong , Park Min Chul , Kim Nam Young 
Published: June 2015

ABSTRACTIn this study, a broadband low noise amplifier (LNA)/mixer for digital video broadcasting‐satellite receiver tuner was fabricated by a 0.18‐µm complementary metal oxide semiconductor (CMOS) process. The proposed broadband LNA receives positive feedback and incorporates a single‐ended differential converter to mixer. Two attenuators are used to obtain good noise performance and high linearity. Moreover, the designed CMOS LNA/mixer achieved gain controls in 3‐dB steps, an input second‐order intercept of 1.37 dBm, and an input third‐order intercept of −3.6 dBm in high‐gain low‐frequency mode. The 6.4‐dB noise of LNA was achieved in the frequency range of 950–2150 MHz. The circuit consumes a total current of 25 mA at a supply voltage of 1.8 V and the chip area of the LNA and the mixer are 0.8 × 0.53 mm2 and 0.8 × 0.6 mm2, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2092–2099, 2015
Dual‐band planar filter with very narrow bandwidths based on a single‐section coupled line
Authors: Lee Sang‐Ho , Park Ji‐Hoon , Lee Yongshik 
Published: June 2015

ABSTRACTA dual‐band filter with very narrow bandwidths is demonstrated that is based on an extremely simple structure of a single‐section coupled line loaded with shunt inductors. The filter can be designed using a remarkably simple design procedure, which is demonstrated in this work. Moreover, its dual‐band performance expands the versatility of the proposed filter to include multiband applications. Experimental results show measured Q‐factors of as high as 88.26 and 77.74 at 2.0 and 3.0 GHz, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2083–2085, 2015
Microwave dielectric properties of pure and Zr4+ doped lead calcium iron niobate substrates for microwave devices and antenna applications
Authors: Puri Maalti , Bahel Shalini , Narang Sukhleen Bindra 
Published: June 2015

ABSTRACTTwo series of (Pb1‐xCax)(Fe0.5Nb0.5)O3 for x = 0.00, 0.20, 0.40, 0.45, 0.50, 0.55, 0.60, and (Pb0.45Ca0.55)(Fe0.5Nb0.5)1‐yZryO3 for 0.00 ≤ y ≤ 0.15 in the steps of 0.03 have been synthesized using columbite precursor method. X‐ray diffraction patterns show that all the solid solutions have tetragonal symmetry. Microwave dielectric properties of synthesized solid solutions have been investigated in X‐band (8.2–12.4 GHz). The substitution of Zr4+ ions at B‐site of (Pb0.45Ca0.55)(Fe0.5Nb0.5)1‐yZryO3 decreased the loss tangent but did not remarkably affect the relative permittivity. The temperature coefficient of relative permittivity decreased with the substitution of Ca2+ ion for Pb2+ ions at A‐site in first series. The temperature coefficient of relative permittivity further decreased with the substitution of Zr4+ ions at B‐site in second series. The reflection loss decreased but VSWR and bandwidth improved slightly with the substitution of Zr contents in second series. The present materials can be used as substrate for microwave devices and antennas applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2151–2155, 2015
Application of the NARX neural network as a digital predistortion technique for linearizing microwave power amplifiers
Authors: Aguilar‐Lobo Lina M. , Loo‐Yau Jose R. , Rayas‐Sánchez Jose E. , Ortega‐Cisneros Susana , Moreno Pablo , Reynoso‐Hernández J. A. 
Published: June 2015

ABSTRACTThis work presents a digital predistortion (DPD) scheme to linearize power amplifiers (PAs) using a recurrent neural network called Nonlinear AutoRegressive with eXogenous input model (NARX) neural network (NARXNN). The architecture of the NARXNN is based on a class of discrete‐time nonlinear system named NARX. Its topology has embedded memory at the input and output of the neural architecture, which allows an efficient linearization of PAs. To show the benefits of the DPD with NARXNN, a commercial PA is fed with a long term evolution signal at 2.0 GHz with 10 MHz of bandwidth. Our experimental results show an adjacent channel leakage ratio improvement of 24 dB. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2137–2142, 2015
Design of compact triple frequency microstrip antenna for WLAN/WiMAX applications
Authors: Kundu Aparna , Bhattacharjee Anup K. 
Published: June 2015

ABSTRACTA compact triple frequency microstrip antenna for WLAN/WiMAX applications is presented in this work. The proposed antenna consists of a rectangular microstrip patch embedded with an inverted L‐shaped open ended slot and a ground plane with horizontal H shaped and rectangular slots. The designed antenna operates over the frequency ranges 2.30–2.751, 3.199–3.816, 5.06–6.15 GHz necessary for 2.4/5.2/5.8 GHz WLAN and 2.3/2.5/3.5/5.5 GHz WiMAX applications. Maximum size reduction of the proposed antenna obtained is about 83.17%. Good agreement is achieved between simulated and measured results. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2125–2129, 2015
A wideband BiCMOS thermal noise canceling low noise amplifier with temperature compensation
Authors: Lu Zheng Hao , Yu Xiao Peng , Yeo Kiat Seng , Lim Wei Meng 
Published: June 2015

ABSTRACTA BiCMOS wideband thermal noise canceling low noise amplifier is presented. This BiCMOS design can achieve significant power consumption reduction comparing to the pure CMOS implementation with the same topology. A novel temperature compensation biasing circuit is also proposed for this BiCMOS noise canceling LNA topology to achieve relatively temperature independent gain. Realized in Tower Jazz 0.18 μm SiGe technology, the measured S21 of the proposed LNA is 17.8 dB with a −3dB bandwidth of 3.3 GHz at room temperature. The measured gain variation from −40 to + 80°C is within ± 0.4 dB. The measured minimum noise figure at room temperature is 1.9 dB when matched to 50 Ω. The chip consumes about 0.2 × 0.3 mm2 area excluding pads and dissipates about 8 mA DC current from a single 1.8 V supply. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2121–2125, 2015
Compact dual‐band antenna for 2.4/5.2/5.8 GHz WLAN service for laptop computer applications
Authors: Sung Y. 
Published: June 2015

ABSTRACTIn this study, a compact dual‐band antenna for wireless universal serial bus dongle applications is proposed. The proposed structure consists of a conventional folded monopole antenna (driven element) and a strip pattern that extends from the ground (GND) plane (shorten parasitic element). The proposed antenna exhibits triple‐resonance (f1, f2, and f3). The first two resonance frequencies (f1 and f2) are generated by adding the shorted parasitic element. The third resonance frequency (f3) is generated by the folded monopole antenna. The first resonance frequency (f1) covers 2.4‐GHz wireless local area network (WLAN) service, whereas the second and third resonance frequencies (f2 and f3) cover 5.2/5.8‐GHz WLAN service. Thus, dual‐band operation for 2.4/5.2/5.8‐GHz WLAN service can be easily performed. The antenna occupies a small area of 7 × 20 mm2. It can be easily connected to the edge of the system GND plane or the supporting metal frame of a laptop computer. Details of the proposed antenna are presented and studied. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2207–2213, 2015
Design of L/X‐band shared aperture antenna array for SAR application
Authors: Shi‐Gang Zhou , Jiang‐Jun Yang , Tan‐Huat Chio 
Published: June 2015

ABSTRACTDesign of a dual‐wideband dual‐polarized planar shared aperture microstrip antenna array is proposed in this article. Differential feeding method is used to enhance the isolation between polarizations of the antenna in both bands.Corporate feed network is used for good radiation pattern results. Further, the coupling between the feed networks the two orthogonal polarizations is minimized. This is achieved using the antenna elements to separate the feed networks for orthogonal polarizations. To verify the antenna design, a prototype is fabricated and measured. For VSWR, the antenna can cover from 1.07 to 1.24 GHz (14.7%) and from 8.3 to10.3 GHz (21.5%), respectively. The measured isolation between bands is higher than 30 dB and the isolation between polarizations is higher than 22.5 and 29.6 dB in L‐ and X‐band, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2197–2204, 2015