bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis of an inositol hexakisphosphate (IP6) affinity probe to study the interactome from a colon cancer cell line
Authors: Yin Meng-xin , Catimel Bruno , Gregory Mark , Condron Melanie , Kapp Eugene , Holmes Andrew B. , Burgess Antony W.
Published: January 2016

Inositol hexakisphosphate (InsP6or IP6) is an important signalling molecule. An IP6probe was synthesised frommyo-inositol and immobilised onto Dynabeads for proteomic analysis. LC/MS/MS analysis identified 77 proteins or protein complexes that bind to IP6specifically.
Small heterocycles as highly luminescent building blocks in the solid state for organic synthesis
Authors: Santos Fabiano da Silveira , Medeiros Natália Goedtel , Affeldt Ricardo Ferreira , Duarte Rodrigo da Costa , Moura Sidnei , Rodembusch Fabiano Severo
Published: January 2016

ESIPT photoactive mono-formylated benzoxazole derivatives obtained through a Duff functionalization protocol using a simple synthetic methodology.
I only have eye for ewe: the discovery of cyclopamine and development of Hedgehog pathway-targeting drugs
Authors: Chen James K.
Published: January 2016

Outbreaks of cyclopic lambs during the 1950s led to the discovery of cyclopamine and new anticancer therapies.
Zinc oxide nanorod assisted rapid single-step process for the conversion of electrospun poly(acrylonitrile) nanofibers to carbon nanofibers with a high graphitic content
Authors: Nain Ratyakshi , Singh Dhirendra , Jassal Manjeet , Agrawal Ashwini K.
Published: January 2016

The effect of incorporation of rigid zinc oxide (ZnO) nanostructures on carbonization behavior of electrospun special acrylic fiber grade poly(acrylonitrile) (PAN-SAF) nanofibers was investigated.
Ultra-fast stem cell labelling using cationised magnetoferritin
Authors: Correia Carreira S. , Armstrong J. P. K. , Seddon A. M. , Perriman A. W. , Hartley-Davies R. , Schwarzacher W.
Published: January 2016

Efficient magnetic labelling of stem cells is achieved within a one minute incubation period using cationised magnetoferritin.
Preparation of poly(ionic liquid) nanoparticles and their novel application as flocculants for water purification
Authors: Isik Mehmet , Fernandes Ana M. , Vijayakrishna Kari , Paulis Maria , Mecerreyes David
Published: January 2016

Amphiphilic poly(ionic liquid) random copolymers that self-assemble into polymeric nanoparticles were prepared. The use of poly(ionic liquid) nanoparticles as flocculants enhanced the evolution rate of the sediment considerably in comparison with the parent polyelectrolytes.
Optimized fabrication and characterization of TiO2–Nb2O5–Al2O3mixed oxide nanotube arrays on Ti–6Al–7Nb
Authors: Rafieerad A. R. , Bushroa A. R. , Nasiri-Tabrizi B. , Vadivelu J. , Baradaran S. , Zalnezhad E. , Amiri A.
Published: January 2016

The TiO2–Nb2O5–Al2O3mixed oxide nanotube arrays on Ti67 are the promising nanostructured materials for metallic orthopaedic implants.
Two novel amino acid-coated super paramagnetic nanoparticles at low concentrations label and promote the proliferation of mesenchymal stem cells
Authors: Yu Zhe-Zhen , Wu Qing-Hua , Zhang Shang-Li , Miao Jun-Ying , Zhao Bao- Xiang , Su Le
Published: January 2016

We identified two amino acid-coated magnetic nanoparticles that promoted mesenchymal stem cell growth without the need for transfection agents by increasing the proportion of cells in the S phase.
Reconstitution of bacteriorhodopsin with cationic poly(dimethylaminoethyl acrylate)-block-poly(methylacrylate) for bio-hybrid materials
Authors: He Weiwei , Ma Jiaqi , Shu Xiaowen , Qian Jun , Hua Daoben
Published: January 2016

A kind of cationic amphiphilic copolymer was synthesized for supporting membrane proteins to prepare bio-hybrid materials.
A sensitive electrochemical sensor for the determination of carvedilol based on a modified glassy carbon electrode with ordered mesoporous carbon
Authors: Rofouei Mohammad Kazem , Khoshsafar Hamid , Kalbasi Roozbeh Javad , Bagheri Hasan
Published: January 2016

This work describes the incorporation of ordered mesoporous carbon (OMC) as a sensing material for carvedilol (CAR) detection on a glassy carbon electrode (GCE).
Preparation of DyVO4/WO3 heterojunction plate array films with enhanced photoelectrochemical activity
Authors: Zhan Faqi , Yang Yahui , Li Wenzhang , Li Jie , Liu Wenhua , Li Yaomin , Chen Qiyuan
Published: January 2016

In this work, DyVO4/WO3 heterojunction plate arrays were first fabricated on FTO using a hydrothermal method for WO3 vertical plate arrays and a dipping–annealing process for the deposition of DyVO4 nanoparticles.
BODIPY based self-healing fluorescent gel formation via acylhydrazone linkage
Authors: Ozdemir Tugba , Sozmen Fazli
Published: January 2016

Polymeric BODIPY derivatives with reactive functional groups undergo reversible formation of covalent bonds leading to self-healing properties.
A thiosemicarbazone based chemo and fluorogenic sensor for Zn2+with CHEF and ESIPT behaviour: computational studies and cell imaging application
Authors: Bhowmick Rahul , Alam Rabiul , Mistri Tarun , Das Kalyan Kumar , Katarkar Atul , Chaudhuri Keya , Ali Mahammad
Published: January 2016

A novel diformyl-p-cresol (DFC)–thiosemicarbazide (TS) – based turn-on dual sensor that enables to determine, for the first time, the stepwise formation constants.
Vinyl sulfone modified-azidofuranoside building-blocks: 1,4-/1,5-disubstituted-1,2,3-triazole linked trisaccharides via an aqueous/ionic-liquid route and “Click” chemistry
Authors: Kayet Anirban , Ganguly Arghya , Pathak Tanmaya
Published: January 2016

1,5-Disubstituted 1,2,3-triazole (1,5-DT) linked disaccharides have been synthesized from stable building blocks having both vinyl sulfone and azido groups using aqueous ionic-liquid media.
Crack growth mechanism of styrene-butadiene rubber filled with silica nanoparticles studied by small angle X-ray scattering
Authors: Weng Gengsheng , Chang Aijun , Fu Kun , Kang Jian , Ding Yaxuan , Chen Zhongren
Published: January 2016

Crack growth mechanism of styrene-butadiene rubber influenced by silica nanoparticles.
Effective segregation of cytocompatible chitosan molecules in a silica-surfactant nanostructure formation process
Authors: Tagaya M.
Published: January 2016

Segregated nanostructures of Chi molecules by a silica-surfactant self-assembly film formation process were successfully prepared, and it is shown that their self-organization affects the cytocompatibility.
Facile surface engineering of CuInS2/ZnS quantum dots for LED down-converters
Authors: Gugula K. , Stegemann L. , Cywiński P. J. , Strassert C. A. , Bredol M.
Published: January 2016

Surface engineered CuInS2 quantum dots with extraodrinary properties in polymer nanocomposites and high stability in sol–gel silica are presented herein.
Synthesis, coordination behavior and structural features of chiral iron(ii) PNP diferrocene complexes
Authors: Zirakzadeh Afrooz , Kirchner Karl , Roller Alexander , Stöger Berthold , Carvalho Maria Deus , Ferreira Liliana P.
Published: January 2016

New chiral PNP and PNHP ferrocene ligands and the corresponding Fe(ii) complexes of PNP ligands with the general formula [Fe(PNP)X2] (X = Cl, Br) were synthesized.
Electronic and optical properties of surface hydrogenated armchair graphene nanoribbons: a theoretical study
Authors: Zhu Xi , Wang Min
Published: January 2016

The hydrogen coverage on armchair graphene nanoribbons affects the spatial distribution of the wavefunction locally, revealing a confinement phenomenon, and influences the electronic and optical properties as well.
Double-crosslinked network design for self-healing, highly stretchable and resilient polymer hydrogels
Authors: Lin Yinlei , He Deliu , Chen Zhifeng , Wang Liying , Li Guangji
Published: January 2016

A novel type of chemically and physically double-crosslinked network (CPDN) polymer hydrogels with excellent self-healing and mechanical properties were prepared and investigated.
Synthesis of biosafe isosorbide dicaprylate ester plasticizer by lipase in a solvent-free system and its sub-chronic toxicity in mice
Authors: Cui Caixia , Zhen Yueju , Qu Junge , Chen Biqiang , Tan Tianwei
Published: January 2016

The biosafety isosorbide dicaprylate ester plasticizer was synthesized with bubbling dried air in solvent-free system.
Stable luminescent iridium(iii) complexes with bis(N-heterocyclic carbene) ligands: photo-stability, excited state properties, visible-light-driven radical cyclization and CO2 reduction, and cellular imaging
Authors: Yang Chen , Mehmood Faisal , Lam Tsz Lung , Chan Sharon Lai-Fung , Wu Yuan , Yeung Chi-Shun , Guan Xiangguo , Li Kai , Chung Clive Yik-Sham , Zhou Cong-Ying , Zou Taotao , Che Chi-Ming
Published: January 2016

Excited state properties, photo-catalysis and cellular imaging of photo-stable bis-NHC Ir(iii) complexes are described.
A robust and reproducible procedure for cross-linking thermoset polymers using molecular simulation
Authors: Demir Baris , Walsh Tiffany R.
Published: January 2016

Our reliable and reproducible cross-linking procedure ranges from careful equilibration of the liquid polymer precursor to calculating the thermo-mechanical properties of the cross-linked polymer. Our approach can be used to cure not only pure thermoset polymers, but also thermoset-based composite materials.
Decoration of the inert basal plane of defect-rich MoS2 with Pd atoms for achieving Pt-similar HER activity
Authors: Qi Kun , Yu Shansheng , Wang Qiyu , Zhang Wei , Fan Jinchang , Zheng Weitao , Cui Xiaoqiang
Published: January 2016

A molybdenum disulfide/palladium nanodisk heterostructure was determined to be highly active toward the HER through DFT predictions and experimental verification.
Morphology and crystal phase evolution induced performance enhancement of MnO2 grown on reduced graphene oxide for lithium ion batteries
Authors: Jiang Yu , Jiang Zhong-Jie , Chen Bohong , Jiang Zhongqing , Cheng Si , Rong Haibo , Huang Jianlin , Liu Meilin
Published: January 2016

MnO2 nanorods grown on reduced graphene oxide used as an anode in LIBs, demonstrate a significant enhancement in performance during cycling due to morphology evolution, among the best reported after 300 cycles.
Single-band red upconversion luminescence of Yb3+–Er3+via nonequivalent substitution in perovskite KMgF3 nanocrystals
Authors: Wu M. , Song E. H. , Chen Z. T. , Ding S. , Ye S. , Zhou J. J. , Xu S. Q. , Zhang Q. Y.
Published: January 2016

Single-band red upconversion emission of Er3+ has been successfully achieved in Yb3+/Er3+ codoped KMgF3 nanocrystals via a nonequivalent substitution strategy.
Active and dynamic infrared switching of VO2 (M) nanoparticle film on ITO glass
Authors: Li Ming , Wu Hao , Zhong Li , Wang Hua , Luo Yuanyuan , Li Guanghai
Published: January 2016

Stable and reversible infrared modulation of the VO2 (M) nanoparticle/ITO glass device upon an applied voltage.
Profilin–PTEN interaction suppresses NF-κB activation via inhibition of IKK phosphorylation
Authors: Zaidi Adeel H. , Manna Sunil K.
Published: January 2016

The molecular mechanism of Profilin for its tumour suppressor activity is still unknown. Nuclear transcription factor κB (NF-κB) is known to activate many target genes involved in cell proliferation. In the present study, we provide evidence that supports the involvement of Profilin in regulation of NF-κB, which might repress the tumorigenic response. Profilin overexpressing cells show low basal activity of IκBα kinase (IKK), high amounts of cytoplasmic inhibitory subunit of NF-κB (IκBα) and p65, and low nuclear NF-κB DNA binding activity. Co-localization and co-immunoprecipitation (Co-IP) studies suggest that Profilin interacts with a protein phosphatase, phosphatase and tension homologue (PTEN), and protects it from degradation. In turn, PTEN interacts physically and maintains a low phosphorylated state of the IKK complex and thereby suppresses NF-κB signalling. Thus, Profilin overexpressing cells show a decrease in NF-κB activation mediated by most of the inducers and potentiate cell death by repressing NF-κB-dependent genes involved in cell cycle progression. For the first time, we provide evidence, which suggests that Profilin increases tumour suppressor activity by regulating NF-κB.
PAFR in adipose tissue macrophages is associated with anti-inflammatory phenotype and metabolic homoeostasis
Authors: Filgueiras Luciano Ribeiro , Koga Marianna Mainardi , Quaresma Paula G. , Ishizuka Edson Kiyotaka , Montes Marlise B.A. , Prada Patricia O. , Saad Mario J. , Jancar Sonia , Rios Francisco J.
Published: January 2016

Metabolic dysfunction is associated with adipose tissue inflammation and macrophage infiltration. PAFR (platelet-activating factor receptor) is expressed in several cell types and binds to PAF (platelet-activating factor) and oxidized phospholipids. Engagement of PAFR in macrophages drives them towards the anti-inflammatory phenotype. In the present study, we investigated whether genetic deficiency of PAFR affects the phenotype of ATMs (adipose tissue macrophages) and its effect on glucose and insulin metabolism. PARFKO (PAFR-knockout) and WT (wild-type) mice were fed on an SD (standard diet) or an HFD (high-fat diet). Glucose and insulin tolerance tests were performed by blood monitoring. ATMs were evaluated by FACS for phenotypic markers. Gene and protein expression was investigated by real-time reverse transcription–quantitative PCR and Western blotting respectively. Results showed that the epididymal adipose tissue of PAFRKO mice had increased gene expression of Ccr7, Nos2, Il6 and Il12, associated with pro-inflammatory mediators, and reduced expression of the anti-inflammatory Il10. Moreover, the adipose tissue of PAFRKO mice presented more pro-inflammatory macrophages, characterized by an increased frequency of F4/80+CD11c+ cells. Blood monocytes of PAFRKO mice also exhibited a pro-inflammatory phenotype (increased frequency of Ly6C+ cells) and PAFR ligands were detected in the serum of both PAFRKO and WT mice. Regarding metabolic parameters, compared with WT, PAFRKO mice had: (i) higher weight gain and serum glucose concentration levels; (ii) decreased insulin-stimulated glucose disappearance; (iii) insulin resistance in the liver; (iv) increased expression of Ldlr in the liver. In mice fed on an HFD, some of these changes were potentiated, particularly in the liver. Thus it seems that endogenous ligands of PAFR are responsible for maintaining the anti-inflammatory profile of blood monocytes and ATMs under physiological conditions. In the absence of PAFR signalling, monocytes and macrophages acquire a pro-inflammatory phenotype, resulting in adipose tissue inflammation and metabolic dysfunction.
Price restricted optimal bidding model using derated sensitivity factors by considering risk concept
Authors: Ahmadian Saeed , Vahidi Behrooz , Jahanipour Jahandar , Hoseinian Seyed Hossein , Rastegar Hasan
Published: January 2016

In this study, a new model for participating in market is presented in which each generation company (GENCO), considering nodal price limitation, defines a risk index. Using a linear combination, it determines its proposed bid based on energy prices of other buses. Since each participant in power market needs reference points to decide, concept of sensitivity factors is introduced initially. Consequently, using these factors, potential points are obtained. To model price uncertainty, risk concept is cooperated into sensitivity factors. After that, using regulation factors, new derated sensitivity factors (DSFs) are defined. Applying these factors, each player's model in the market is divided into two parts. In the first part, modelling its rival's behaviour, a player proposes its bid in such a way that obtained nodal price becomes equal to estimated nodal price. In the second part, computing DSFs and using potential bus prices, linear combination of regulation factors are utilized to modify GENCO's offer. Player's profit function would be average of both parts. GAMS software is executed to solve this problem. Different scenarios are considered to cover nodal electricity and fuel price uncertainties. A 30‐bus system with six GENCOs is used to verify the proposed model.
Risk assessment of surge current generated by spark discharges on open contacts of small power relays
Authors: Chen Chao‐Rong , Chen Mu‐Cheng , Chen Chun‐Chi
Published: January 2016

In this study, the spark discharge risks on small relays in low‐voltage circuits are evaluated based on the test current magnitude and the rate of current change of surge current. For the risk assessment of spark discharge caused by the high‐voltage switching surge on the small relay in low‐voltage circuits, there are fewer papers relevant to the topic. First of all, this study presents the construction of a test circuit model, in which the open contacts of small relays are energised by a set of spark discharge generators. The actual current waveforms are measured and analysed. This study provides a manner to evaluate the risk degree of the small relay in low‐voltage circuits damaged by the surge current. Referring to the relevant IEEE standards concerning surge protection, a surge protection circuit of a signal line is applied. The test is done after installing this surge protection circuit, the test of spark discharge is done after installing this surge protection circuit, and the test result confirms that the use of surge protection devices can suppress the surge current, so this study can be applied to reduce the hazards of the low‐voltage equipment.
Maximum constant boost approach for controlling quasi‐Z‐source‐based interlinking converters in hybrid AC–DC microgrids
Authors: Khajesalehi Jasem , Sheshyekani Keyhan , Hamzeh Mohsen , Afjei Ebrahim
Published: January 2016

This study presents the mathematical modelling and control design methodology of bidirectional quasi‐Z‐source inverters (qZSIs) for interlinking converter application in hybrid AC–DC microgrids. The proposed control scheme provides the maximum constant boost (MCB) control capability for the qZSI in both grid‐connected and islanded modes of operation even in the presence of unbalanced AC loads. The proposed approach maintains the MCB without any additional control loop for regulating the voltage of the DC‐side capacitor of the qZSI. This is done by determining the shoot through duty cycle of the qZSI based on the inverter modulation index. Moreover, maintaining the MCB condition, the proposed control scheme provides a high stability margin for the qZSI network. The effectiveness of the proposed method is demonstrated through simulation studies conducted on a typical AC–DC hybrid microgrid in MATLAB/Simulink environment for both islanded and grid‐connected modes of operation.
Fast and accurate measurement of harmonic parameters employing hybrid adaptive linear neural network and filtered‐x least mean square algorithm
Authors: Garanayak Priyabrat , Panda Gayadhar
Published: January 2016

This study proposes a novel algorithm for fast and accurate measurement of fundamental, harmonics, sub‐ and inter‐harmonic parameters of a distorted current signal with additive noise. A novel hybrid technique called adaptive linear neural network and filtered‐x least mean square (ADALINE‐FXLMS) algorithm is employed for amplitude and phase estimation. The ADALINE‐FXLMS algorithm is the advancement of ADALINE least mean square (ADALINE‐LMS) algorithm. With the help of this proposed algorithm, the adaptive step‐size parameter is expanded up to the upper‐bound limit that results in further improvement of system stability. The convergence behaviour of the mean square errors for the noisy input signal is derived in details. By applying the proposed algorithm, the dynamic and steady‐state response are analysed with different signal‐to‐noise ratio values. The simulated results obtained from the proposed algorithm are compared with the results generated by the variable step‐size ADALINE‐LMS algorithm in order to demonstrate the tracking capability. Finally, a laboratory prototype model is developed to justify the efficacy of the analytical results. The motivation of applying the proposed hybrid algorithm is due to its successful implementation in a real‐time environment, faster convergence and simplicity structure.
Economic aspects for multi‐step LC compensator with uncertain load characteristics using genetic algorithm
Authors: Saleh Saber M. , Ibrahiem Khaled H. , Eiteba Mahmoud B. Magdi
Published: January 2016

This study presents a method to consider the probabilistic nature of load impedance and harmonic currents by converting the conventional inductive–capacitive (LC) compensator into a multi‐step type consisting of switchable units thus assuming that a single unit is not sufficient to ensure satisfactory results. The compensator steps are optimised based on economic criteria; minimising cost and maximising saving; in addition to cost‐constrained performance criteria; maximising the power factor, minimising the transmission loss or minimising the voltage total harmonic distortion. The compensator values which would create resonance are constrained. Also the manufacturer's standard values for power shunt capacitors are considered. Genetic algorithm (GA) is used in the optimisation process plus numerical iterative method. GA is a search mechanism based on the principle of natural selection and population genetics. The contribution of the proposed procedure is demonstrated in examples taken from previous publications. Finally, simulated results show that the multi‐step LC compensator provides a considerable improvement in the economics in case of probabilistic condition.
Decentralised voltage balancing in bipolar dc microgrids equipped with trans‐z‐source interlinking converter
Authors: Dadjo Tavakoli Saman , Khajesalehi Jasem , Hamzeh Mohsen , Sheshyekani Keyhan
Published: January 2016

This study presents an improved version of bipolar dc microgrids in which a distributed voltage‐balancing strategy supplants the central voltage balancer. The improved bipolar dc microgrid is interlinked to the ac grid using a trans‐z‐source inverter for which a new voltage control system is adopted. The shoot‐through duty cycle, d‐axis current reference, and voltages of dc‐side capacitors are controlled by the proposed voltage control system. A bipolar, bidirectional dc/dc boost converter is designed to fulfil the voltage regulation and voltage‐balancing functions in case the trans‐z‐source inverter is disconnected from the ac grid. A power‐sharing scheme is also proposed in which two droop gains are employed to modify voltage control loops of each converter. Simulations are done for a bipolar dc microgrid involving a trans‐z‐source interlinking converter while local distributed generations (DGs) are interfaced to the microgrid by bipolar boost converters.
Fast adaptive back‐stepping terminal sliding mode power control for both the rotor‐side as well as grid‐side converter of the doubly fed induction generator‐based wind farms
Authors: Patnaik R.K. , Dash P.K.
Published: January 2016

A fast adaptive back‐stepping terminal sliding mode power control strategy for both the rotor‐side converter and the grid‐side converter of doubly fed induction generator (DFIG) is proposed in this study. The proposed control strategy for the DFIG converters utilises the active and reactive power components derived from the three‐phase voltage and current without the use of phase‐locked loops. For a multimachine power network, incorporating long‐distance transmission lines, inter area oscillation has been a critical issue. Additionally the integration of wind farm to the existing power systems results in the variation of its operating point over time due to unpredictable wind speed variation and consequent fluctuation in the power outputs. Further the proposed control strategy for the DFIG‐based wind farms has been tested on a two‐ area four‐generator system in MATLAB/Editor and MATLAB/Simulink environment subjected to different levels of wind power penetration. The significance and effectiveness of the proposed control strategy to damp out inter area oscillations have been illustrated in the simulation and result section.
Direct electrocaloric measurement of 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3 films using scanning thermal microscopy
Authors: Crossley S. , Usui T. , Nair B. , Kar-Narayan S. , Moya X. , Hirose S. , Ando A. , Mathur N. D.
Published: January 2016

We show that scanning thermal microscopy can measure reversible electrocaloric (EC) effects in <40 μm-thick ceramic films of the relaxor ferroelectric 0.9Pb(Mg1/3Nb2/3)O3-0.1PbTiO3, with the substrate present. We recorded roughly the same non-adiabatic temperature change (±0.23 K) for a thinner film that was driven harder than a thicker film (±31 V μm−1 across 13 μm versus ±11 V μm−1 across 38 μm), because the thicker film lay relatively closer to the substantially larger adiabatic values that we predicted by thermodynamic analysis of electrical data. Film preparation was compatible with the fabrication of EC multilayer capacitors, and therefore our measurement method may be exploited for rapid characterisation of candidate films for cooling applications.
Beam transport and space charge compensation strategies (invited)
Authors: Meusel O. , Droba M. , Noll D. , Schulte K. , Schneider P. P. , Wiesner C.
Published: January 2016

The transport of intense ion beams is affected by the collective behavior of this kind of multi-particle and multi-species system. The space charge expressed by the generalized perveance dominates the dynamical process of thermalisation, which leads to emittance growth. To prevent changes of intrinsic beam properties and to reduce the intensity dependent focusing forces, space charge compensation seems to be an adequate solution. In the case of positively charged ion beams, electrons produced by residual gas ionization and secondary electrons provide the space charge compensation. The influence of the compensation particles on the beam transport and the local degree of space charge compensation is given by different beam properties as well as the ion beam optics. Especially for highly charged ion beams, space charge compensation in combination with poor vacuum conditions leads to recombination processes and therefore increased beam losses. Strategies for providing a compensation-electron reservoir at very low residual gas pressures will be discussed.
Nested trampoline resonators for optomechanics
Authors: Weaver M. J. , Pepper B. , Luna F. , Buters F. M. , Eerkens H. J. , Welker G. , Perock B. , Heeck K. , de Man S. , Bouwmeester D.
Published: January 2016

Two major challenges in the development of optomechanical devices are achieving a low mechanical and optical loss rate and vibration isolation from the environment. We address both issues by fabricating trampoline resonators made from low pressure chemical vapor deposition Si3N4 with a distributed Bragg reflector mirror. We design a nested double resonator structure with 80 dB of mechanical isolation from the mounting surface at the inner resonator frequency, and we demonstrate up to 45 dB of isolation at lower frequencies in agreement with the design. We reliably fabricate devices with mechanical quality factors of around 400 000 at room temperature. In addition, these devices were used to form optical cavities with finesse up to 181 000 ± 1000. These promising parameters will enable experiments in the quantum regime with macroscopic mechanical resonators.
Communication: An effective linear-scaling atomic-orbital reformulation of the random-phase approximation using a contracted double-Laplace transformation
Authors: Schurkus Henry F. , Ochsenfeld Christian
Published: January 2016

An atomic-orbital (AO) reformulation of the random-phase approximation (RPA) correlation energy is presented allowing to reduce the steep computational scaling to linear, so that large systems can be studied on simple desktop computers with fully numerically controlled accuracy. Our AO-RPA formulation introduces a contracted double-Laplace transform and employs the overlap-metric resolution-of-the-identity. First timings of our pilot code illustrate the reduced scaling with systems comprising up to 1262 atoms and 10 090 basis functions.
In situ tuning of coupled superconducting microwave resonators
Authors: Gunupudi B. , Muirhead C. M. , Colclough M. S.
Published: January 2016

In order to transfer a range of important optical experiments into the microwave regime, a pair of near-identical, weakly coupled resonators is required. We describe a simple tuning mechanism for taking a pair of coupled, coplanar resonators through the avoided crossing in a controlled way. We see no obvious degradation of their high quality factor and find very good agreement with theoretical expectations.
Time-dependent pseudofermionic systems and coherent states
Authors: Cherbal O. , Maamache M.
Published: January 2016

We show, by means of similarity transformations, that the time-dependent fermionic systems are associated to the time-dependent pseudofermionic systems. A general construction of time dependent fermionic coherent states (FCSs) describing the two-level dissipative system driven by a periodic electromagnetic field is developed, and a strict parallelism between FCS and the time dependent pseudofermionic coherent states (PFCSs) is established and examined. We discuss properties of the constructed FCS and PFCS.
GW and Bethe-Salpeter study of small water clusters
Authors: Blase Xavier , Boulanger Paul , Bruneval Fabien , Fernandez-Serra Marivi , Duchemin Ivan
Published: January 2016

We study within the GW and Bethe-Salpeter many-body perturbation theories the electronic and optical properties of small (H2O)n water clusters (n = 1-6). Comparison with high-level CCSD(T) Coupled-Cluster at the Single Double (Triple) levels and ADC(3) Green’s function third order algebraic diagrammatic construction calculations indicates that the standard non-self-consistent G0W0@PBE or G0W0@PBE0 approaches significantly underestimate the ionization energy by about 1.1 eV and 0.5 eV, respectively. Consequently, the related Bethe-Salpeter lowest optical excitations are found to be located much too low in energy when building transitions from a non-self-consistent G0W0 description of the quasiparticle spectrum. Simple self-consistent schemes, with update of the eigenvalues only, are shown to provide a weak dependence on the Kohn-Sham starting point and a much better agreement with reference calculations. The present findings rationalize the theory to experiment possible discrepancies observed in previous G0W0 and Bethe-Salpeter studies of bulk water. The increase of the optical gap with increasing cluster size is consistent with the evolution from gas to dense ice or water phases and results from an enhanced screening of the electron-hole interaction.
Nearly lattice-matched short-wave infrared InGaAsBi detectors on InP
Authors: Gu Y. , Zhang Y. G. , Chen X. Y. , Ma Y. J. , Xi S. P. , Du B. , Li Hsby.
Published: January 2016

This work reports on the demonstration of a short-wave infrared detector nearly lattice matched to InP substrate using quaternary InGaAsBi as the absorption layer. The bismuth content of about 3.2% has red-shifted the 50% cut-off wavelength from about 1.6 μm to 2.1 μm at room temperature, indicating a bandgap reduction of about 180 meV due to bismuth incorporation. The detector shows an encouraging dark current density of 2.4 × 10−4 A/cm2 at bias voltage of −10 mV at 300 K. This work shows the promising potential of InP-based lattice-matched InGaAsBi detectors for short-wave infrared detection.
Terahertz focusing of multiple wavelengths by graphene metasurfaces
Authors: Liu Liming , Zarate Yair , Hattori Haroldo T. , Neshev Dragomir N. , Shadrivov Ilya V. , Powell David A.
Published: January 2016

Metasurfaces can achieve nearly arbitrary wavefront control based on manipulation of the wave phase profile. We propose a metasurface based on double graphene cut-wire resonators which can cover the complete 2π phase region with high reflection efficiency. This full phase coverage is essential for efficient wavefront manipulation, without reflecting energy into unwanted channels. A mirror capable of focusing multiple wavelengths is demonstrated numerically based on the proposed structure. The mirror can effectively focus terahertz (THz) waves from 1.2 to 1.9 THz to the same focal point by changing the Fermi level of each graphene resonator separately. The presented metasurface could provide a powerful platform for controlling THz waves, including focusing, beam steering, beam shaping, and holography.
Non-thermal optical excitation of terahertz-spin precession in a magneto-optical insulator
Authors: Parchenko Sergii , Satoh Takuya , Yoshimine Isao , Stobiecki Feliks , Maziewski Andrzej , Stupakiewicz Andrzej
Published: January 2016

We demonstrate non-thermal ultrafast laser excitation of spin precession with THz frequency in Gd-Bi-substituted iron garnet via the inverse Faraday effect. The modulation of THz precession by about 60 GHz below the compensation temperature of magnetic moment was observed. The THz frequency precession was caused by the exchange resonance between the Gd and Fe sublattices; we attributed the low-frequency modulation to dielectric resonance mode with a magnetic contribution. We demonstrate the possibility of polarization-sensitive control of spin precession under THz generation by laser pulses, helping to develop high-speed magneto-optical devices.
Understanding of self-terminating pulse generation using silicon controlled rectifier and RC load
Authors: Chang Chris , Alves Fabio , Karunasiri Gamani
Published: January 2016

Recently a silicon controlled rectifier (SCR)-based circuit that generates self-terminating voltage pulses was employed for the detection of light and ionizing radiation in pulse mode. The circuit consisted of a SCR connected in series with a RC load and DC bias. In this paper, we report the investigation of the physics underlying the pulsing mechanism of the SCR-based. It was found that during the switching of SCR, the voltage across the capacitor increased beyond that of the DC bias, thus generating a reverse current in the circuit, which helped to turn the SCR off. The pulsing was found to be sustainable only for a specific range of RC values depending on the SCR’s intrinsic turn-on/off times. The findings of this work will help to design optimum SCR based circuits for pulse mode detection of light and ionizing radiation without external amplification circuitry.
Organic phosphorus speciation in Australian Red Chromosols: stoichiometric control
Authors: Moata Melinda R. S. , Doolette Ashlea L. , Smernik Ronald J. , McNeill Ann M. , Macdonald Lynne M.
Published: January 2016

Organic phosphorus (P) plays an important role in the soil P cycle. It is present in various chemical forms, the relative amounts of which vary among soils, due to factors including climate, land use, and soil type. Few studies have investigated co-variation between P types or stoichiometric correlation with the key elemental components of organic matter– carbon (C) and nitrogen (N), both of which may influence P pool structure and dynamics in agricultural soils. In this study we determined the organic P speciation of twenty Australian Red Chromosols soils, a soil type widely used for cropping in Australia. Eight different chemical forms of P were quantified by 31P NMR spectroscopy, with a large majority (>90%) in all soils identified as orthophosphate and humic P. The strongest correlations (r2 = 0.77–0.85, P < 0.001) between P types were found among minor components: (i) between two inositol hexakisphosphate isomers (myo and scyllo) and (ii) between phospholipids and RNA (both detected as their alkaline hydrolysis products). Total soil C and N were correlated with phospholipid and RNA P, but not the most abundant P forms of orthophosphate and humic P. This suggests an influence of organic matter content on the organic P pool consisting of phospholipid and RNA, but not on inositol P or the largest organic P pool in these soils – humic P.
Investigation of the microstructure and toughness of 550 MPa grade pipeline after the hot-bending process
Authors: Wang X. L. , Tsai Y. T. , Yang J. R. , Shang C. J. , Wang X. M. , Dong L. M. , Yang W. W.
Published: January 2016

In this work, the effects of the hot-bending process on the microstructure and low temperature (−40°C) toughness of weld metal of pipeline K65 (the highest grade of the Russian natural gas pipeline) were studied. The weld metal from the longitudinally submerged arc welding (LSAW) pipe making process was compared with that subsequently treated by the hot-bending process. It was found that the latter process led to serious deterioration in toughness, which obviously degraded the sound properties achieved in the original weld metal of LSAW pipes. Microstructural characterisation revealed that the weld metal, which originally consisted mainly of acicular ferrite in the as-deposited condition, became predominantly composed of bainitic ferrite after hot bending. It is clear that reaustenisation caused a smaller austenite grain-sized matrix, which brought about a very high volume fraction of bainite. Consequently, the low temperature toughness was deteriorated, in contrast to the excellent toughness achieved in the as-deposited weld metal.
Corrosion behaviour of AZ80 Mg/beryllium–bronze–alloy galvanic couples in typical marine environment
Authors: Jiang Q. , Ma X. , Li Y. , Zhang K. , Li X. , Hou B.
Published: January 2016

A high-strength AZ80 Mg alloy was prepared via multi-direction forge, thermal extrusion and peak-aged heat treatment. The corrosion behaviour of AZ80 Mg/beryllium–bronze–alloy galvanic couples in a typical marine environment was investigated. Beryllium–bronze alloy (QBe1.7 Cu) acted as cathode, accelerating the corrosion of AZ80 Mg alloy. With the increase in contact areas, the corrosion rates and galvanic effect also increased, and the galvanic potentials moved positively. However, with a prolonged exposure time, the galvanic potentials and current densities decreased. The corrosion products mainly consisted of MgCl2, Mg5(CO3)4(OH)2·5H2O and MgSO4·7H2O. According to the standard of galvanic corrosion sensitivity from the Air Force Materials Laboratory (AFML), AZ80 Mg alloy was not allowed to make contact with QBe1.7 Cu alloy without effective protection.
Production of keto-disaccharides from aldo-disaccharides in subcritical aqueous ethanol
Authors: Gao Da-Ming , Kobayashi Takashi , Adachi Shuji
Published: January 2016

Isomerization of disaccharides (maltose, isomaltose, cellobiose, lactose, melibiose, palatinose, sucrose, and trehalose) was investigated in subcritical aqueous ethanol. A marked increase in the isomerization of aldo-disaccharides to keto-disaccharides was noted and their hydrolytic reactions were suppressed with increasing ethanol concentration. Under any study condition, the maximum yield of keto-disaccharides produced from aldo-disaccharides linked by β-glycosidic bond was higher than that produced from aldo-disaccharides linked by α-glycosidic bond. Palatinose, a keto-disaccharide, mainly underwent decomposition rather than isomerization in subcritical water and subcritical aqueous ethanol. No isomerization was noted for the non-reducing disaccharides trehalose and sucrose. The rate constant of maltose to maltulose isomerization almost doubled by changing solvent from subcritical water to 80 wt% aqueous ethanol at 220 °C. Increased maltose monohydrate concentration in feed decreased the conversion of maltose and the maximum yield of maltulose, but increased the productivity of maltulose. The maximum productivity of maltulose was ca. 41 g/(h kg-solution).
On weighted 𝐿² estimates for solutions of the wave equation
Authors: Koh Youngwoo , Seo Ihyeok
Published: January 2016

In this paper we consider weighted

L
2

L^2

integrability for solutions of the wave equation. For this, we obtain some weighed

L
2

L^2

estimates for the solutions with weights in Morrey-Campanato classes. Our method is based on a combination of bilinear interpolation and a localization argument which makes use of the Littlewood-Paley theorem and a property of Hardy-Littlewood maximal functions. We also apply the estimates to the problem of well-posedness for wave equations with potentials.
On the Dirichlet problem for 𝑝-harmonic maps II: Targets with special structure
Authors: Pigola Stefano , Veronelli Giona
Published: January 2016

In this paper we develop new geometric techniques to deal with the Dirichlet problem for a

p
p

-harmonic map from a compact manifold with boundary to a Cartan-Hadamard target manifold which is either

2
2

-dimensional or rotationally symmetric.
The relative 𝑝-affine capacity
Authors: Xiao J. , Zhang N.
Published: January 2016

In this paper, the relative

p
p

-affine capacities are introduced, developed, and subsequently applied to the trace theory of affine Sobolev spaces. In particular, we geometrically characterize such a nonnegative Radon measure

μ
\mu

given on an open set

O

⊆

R

n

\mathcal {O}\subseteq \mathbb R^n

that naturally induces an embedding of the

p
p

-affine Sobolev class

W

0
,
d

1
,
p

(

O

)

{W}^{1,p}_{0,d}(\mathcal {O})

into the Lebesgue space

L
q

(

O

,
μ
)

L^q(\mathcal {O},\mu )

(under

1
≤
p
≤
q
>
∞

1\le p\le q>\infty

) and the exponentially-integrable Lebesgue space
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="exp left-parenthesis left-parenthesis n omega Subscript n Superscript StartFraction 1 Over n EndFraction Baseline StartAbsoluteValue f EndAbsoluteValue right-parenthesis Superscript n slash left-parenthesis n minus 1 right-parenthesis Baseline right-parenthesis element-of upper L Superscript 1 Baseline left-parenthesis script upper O comma mu right-parenthesis">

exp
⁡

(

(
n

ω
n

1
n

|

f

|

)

n

/

(
n
−
1
)

)

∈

L
1

(

O

,
μ
)

\exp \big ((n\omega _n^\frac 1n|f|)^{n/(n-1)}\big )\in L^1(\mathcal {O},\mu )

(under

p
=
n

p=n

) as well as the Lebesgue space

L
∞

(

O

,
μ
)

L^\infty (\mathcal {O},\mu )

(under

n
>
p
>
∞

n>p>\infty

) with

μ
(

O

)
>
∞

\mu (\mathcal {O})>\infty

. The results discovered here are new and nontrivial.
Isometrisable group actions
Authors: Ben Yaacov Itaï , Melleray Julien
Published: January 2016

Given a separable metrisable space

X
X

, and a group

G
G

of homeomorphisms of

X
X

, we introduce a topological property of the action

G
↷
X

G \curvearrowright X

which is equivalent to the existence of a

G
G

-invariant compatible metric on

X
X

. This extends a result of Marjanović obtained under the additional assumption that

X
X

is locally compact.
Constructing infinitely many geometric triangulations of the figure eight knot complement
Authors: Dadd Blake , Duan Aochen
Published: January 2016

This paper considers “geometric” ideal triangulations of cusped hyperbolic 3-manifolds, i.e. decompositions into positive volume ideal hyperbolic tetrahedra. We exhibit infinitely many geometric ideal triangulations of the figure eight knot complement. As far as we know, this is the first construction of infinitely many geometric triangulations of a cusped hyperbolic 3-manifold. In contrast, our approach does not extend to the figure eight sister manifold, and it is unknown if there are infinitely many geometric triangulations for this manifold.
Closed ideals of operators on and complemented subspaces of Banach spaces of functions with countable support
Authors: Johnson William , Kania Tomasz , Schechtman Gideon
Published: January 2016

Let

λ
\lambda

be an infinite cardinal number and let

ℓ
∞
c

(
λ
)

\ell _\infty ^c(\lambda )

denote the subspace of

ℓ
∞

(
λ
)

\ell _\infty (\lambda )

consisting of all functions that assume at most countably many non-zero values. We classify all infinite-dimensional complemented subspaces of

ℓ
∞
c

(
λ
)

\ell _\infty ^c(\lambda )

, proving that they are isomorphic to

ℓ
∞
c

(
κ
)

\ell _\infty ^c(\kappa )

for some cardinal number

κ
\kappa

. Then we show that the Banach algebra of all bounded linear operators on

ℓ
∞
c

(
λ
)

\ell _\infty ^c(\lambda )

or

ℓ
∞

(
λ
)

\ell _\infty (\lambda )

has the unique maximal ideal consisting of operators through which the identity operator does not factor. Using similar techniques, we obtain an alternative to Daws’ approach description of the lattice of all closed ideals of

B

(
X
)

\mathscr {B}(X)

, where

X
=

c
0

(
λ
)

X = c_0(\lambda )

or

X
=

ℓ
p

(
λ
)

X=\ell _p(\lambda )

for some

p
∈
[
1
,
∞
)

p\in [1,\infty )

, and we classify the closed ideals of

B

(

ℓ
∞
c

(
λ
)
)

\mathscr {B}(\ell _\infty ^c(\lambda ))

that contains the ideal of weakly compact operators.
Modular units from quotients of Rogers-Ramanujan type 𝑞-series
Authors: Larson Hannah
Published: January 2016

In recent work, Folsom presents a family of modular units as higher-level analogues of the Rogers-Ramanujan

q
q

-continued fraction. These units are constructed from analytic solutions to the higher-order

q
q

-recurrence equations of Selberg. Here, we consider another family of modular units, which are quotients of Hall-Littlewood

q
q

-series that appear in the generalized Rogers-Ramanujan type identities in the work of Griffin, Ono, and Warnaar. In analogy with the results of Folsom, we provide a formula for the rank of the subgroup these units generate and show that their specializations at the cusp

0
0

generate a subgroup of the cyclotomic unit group of the same rank. In addition, we prove that their singular values generate the same class fields as those of Folsom’s units.
On the embedding of 𝐴₁ into 𝐴_{∞}
Authors: Rey Guillermo
Published: January 2016

We give a quantitative embedding of the Muckenhoupt class

A
1

A_1

into

A
∞

A_\infty

. In particular, we show how

ϵ
\epsilon

depends on

[
w

]

A
1

[w]_{A_1}

in the inequality which characterizes

A
∞

A_\infty

weights:
\[
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="StartFraction w left-parenthesis upper E right-parenthesis Over w left-parenthesis upper Q right-parenthesis EndFraction less-than-or-equal-to left-parenthesis StartFraction StartAbsoluteValue upper E EndAbsoluteValue Over StartAbsoluteValue upper Q EndAbsoluteValue EndFraction right-parenthesis Superscript epsilon Baseline comma">

w
(
E
)

w
(
Q
)

≤

(

|

E

|

|

Q

|

)

ϵ

,

\frac {w(E)}{w(Q)} \leq \biggl ( \frac {|E|}{|Q|} \biggr )^\epsilon ,

\]
where

Q
Q

is any dyadic cube and

E
E

is any subset of

Q
Q

. This embedding yields a sharp reverse-Hölder inequality as an easy corollary.
On the reducibility of 2-dimensional linear quasi-periodic systems with small parameters
Authors: Xu Junxiang , Kun Wang , Min Zhu
Published: January 2016

In this paper we consider a real analytic linear quasi-periodic system of 2-dimension, whose coefficient matrix depends on a small parameter

C
m

C^m

-smoothly and closes to constant. Under some non-resonance conditions about the basic frequencies and the eigenvalues of the constant matrix and without any non-degeneracy assumption with respect to the small parameter, we prove that the system is reducible for many of the sufficiently small parameters.
Ulrich bundles on abelian surfaces
Authors: Beauville Arnaud
Published: January 2016

We prove that any abelian surface admits a rank

2
2

Ulrich bundle.
Graphical cyclic supercharacters for composite moduli
Authors: Lutz Bob
Published: January 2016

Recent work has introduced the study of graphical properties of cyclic supercharacters, functions

Z

/

n

Z

→

C

\mathbb {Z}/n\mathbb {Z}\to \mathbb {C}

whose values are exponential sums with close connections to Gauss sums and Gaussian periods. Plots of these functions exhibit striking features, some of which have been previously explained when the modulus

n
n

is a power of an odd prime. After reviewing this material, we initiate the graphical study of images of cyclic supercharacters in the case of composite

n
n

.
Flat connected finite quandles
Authors: Ishihara Yoshitaka , Tamaru Hiroshi
Published: January 2016

Quandles can be regarded as generalizations of symmetric spaces. In the study of symmetric spaces, the notion of flatness plays an important role. In this paper, we define the notion of flat quandles, by referring to the theory of Riemannian symmetric spaces, and classify flat connected finite quandles.