bluuebunny/crossref_metadata_2025 huggingface dataset:
Molecular architecture of the Ub-PCNA/Pol η complex bound to DNA
Authors: Lau Wilson C. Y. , Li Yinyin , Zhang Qinfen , Huen Michael S. Y.
Published: October 2015

Translesion synthesis (TLS) is the mechanism by which DNA polymerases replicate through unrepaired DNA lesions. TLS is activated by monoubiquitination of the homotrimeric proliferating cell nuclear antigen (PCNA) at lysine-164, followed by the switch from replicative to specialized polymerases at DNA damage sites. Pol η belongs to the Y-Family of specialized polymerases that can efficiently bypass UV-induced lesions. Like other members of the Y-Family polymerases, its recruitment to the damaged sites is mediated by the interaction with monoubiquitinated PCNA (Ub-PCNA) via its ubiquitin-binding domain and non-canonical PCNA-interacting motif in the C-terminal region. The structural determinants underlying the direct recognition of Ub-PCNA by Pol η, or Y-Family polymerases in general, remain largely unknown. Here we report a structure of the Ub-PCNA/Pol η complex bound to DNA determined by single-particle electron microscopy (EM). The overall obtained structure resembles that of the editing PCNA/PolB complex. Analysis of the map revealed the conformation of ubiquitin that binds the C-terminal domain of Pol η. Our present study suggests that the Ub-PCNA/Pol η interaction requires the formation of a structured binding interface, which is dictated by the inherent flexibility of Ub-PCNA.
Sintering boron carbide ceramics without grain growth by plastic deformation as the dominant densification mechanism
Authors: Ji Wei , Rehman Sahibzada Shakir , Wang Weimin , Wang Hao , Wang Yucheng , Zhang Jinyong , Zhang Fan , Fu Zhengyi
Published: October 2015

A new ceramic sintering approach employing plastic deformation as the dominant mechanism is proposed, at low temperature close to the onset point of grain growth and under high pressure. Based on this route, fully dense boron carbide without grain growth can be prepared at 1,675–1,700 °C and under pressure of (≥) 80 MPa in 5 minutes. The dense boron carbide shows excellent mechanical properties, including Vickers hardness of 37.8 GPa, flexural strength of 445.3 MPa and fracture toughness of 4.7 MPa•m0.5. Such a process should also facilitate the cost-effective preparation of other advanced ceramics for practical applications.
Functional genomics of human brain development and implications for autism spectrum disorders
Authors: Ziats M N , Grosvenor L P , Rennert O M
Published: October 2015

Transcription of the inherited DNA sequence into copies of messenger RNA is the most fundamental process by which the genome functions to guide development. Encoded sequence information, inherited epigenetic marks and environmental influences all converge at the level of mRNA gene expression to allow for cell-type-specific, tissue-specific, spatial and temporal patterns of expression. Thus, the transcriptome represents a complex interplay between inherited genomic structure, dynamic experiential demands and external signals. This property makes transcriptome studies uniquely positioned to provide insight into complex genetic–epigenetic–environmental processes such as human brain development, and disorders with non-Mendelian genetic etiologies such as autism spectrum disorders. In this review, we describe recent studies exploring the unique functional genomics profile of the human brain during neurodevelopment. We then highlight two emerging areas of research with great potential to increase our understanding of functional neurogenomics—non-coding RNA expression and gene interaction networks. Finally, we review previous functional genomics studies of autism spectrum disorder in this context, and discuss how investigations at the level of functional genomics are beginning to identify convergent molecular mechanisms underlying this genetically heterogeneous disorder.
Facile multi-dimensional profiling of chemical gradients at the millimetre scale
Authors: Chen Chih-Lin , Hsieh Kai-Ta , Hsu Ching-Fong , Urban Pawel L.
Published: October 2015

Tomography with a LCD/LED screen as the source of light enables multi-dimensional reconstruction of non-homogeneous samples.
Target-triggered cascade recycling amplification for label-free detection of microRNA and molecular logic operations
Authors: Bi Sai , Ye Jiayan , Dong Ying , Li Haoting , Cao Wei
Published: October 2015

A cascade recycling amplification (CRA) that implements cascade logic circuits with feedback amplification function is developed for label-free chemiluminescence detection of microRNA-122 with an ultrahigh sensitivity of 0.82 fM and excellent specificity, which is applied to construct a series of molecular-scale two-input logic gates by using microRNAs as inputs and CRA products as outputs.
Site-specific conjugation of drug-like fragments to an antimiR scaffold as a strategy to target miRNAs inside RISC
Authors: Brunschweiger A. , Gebert L. F. R. , Lucic M. , Pradère U. , Jahns H. , Berk C. , Hunziker J. , Hall J.
Published: October 2015

We synthesized a miR-122 antimiR library in which drug-like fragments were site-specifically introduced. This affected cellular activity in a position-dependent manner.
Engineering PQQ-glucose dehydrogenase into an allosteric electrochemical Ca2+ sensor
Authors: Guo Zhong , Johnston Wayne A. , Stein Viktor , Kalimuthu Palraj , Perez-Alcala Siro , Bernhardt Paul V. , Alexandrov Kirill
Published: October 2015

Electrochemical biosensors convert biological events to an electrical current.
Coligand syntheses, crystal structures, luminescence and photocatalytic properties of five coordination polymers based on rigid tetracarboxylic acids and imidazole linkers
Authors: Fan Liming , Fan Weiliu , Li Bin , Zhao Xian , Zhang Xiutang
Published: October 2015

Coligand syntheses, crystal structures, luminescence and photocatalytic properties of five coordination polymers based on rigid tetracarboxylic acids and imidazole linkers.
Electrochemistry and speciation of Au+in a deep eutectic solvent: growth and morphology of galvanic immersion coatings
Authors: Ballantyne Andrew D. , Forrest Gregory C. H. , Frisch Gero , Hartley Jennifer M. , Ryder Karl S.
Published: October 2015

In this study we compare the electrochemical and structural properties of three gold salts AuCl, AuCN and KAu(CN)2in a Deep Eutectic Solvent (DES) electrolyte (Ethaline 200) in order to elucidate factors affecting the galvanic deposition of gold coatings on nickel substrates.
Reactivity in the periphery of functionalised multiple bonds of heavier group 14 elements
Authors: Präsang Carsten , Scheschkewitz David
Published: October 2015

Stable heavier alkene homologues with secondary functional groups are discussed emphasizing peripheral transformations under retention of the heavier double bond.
The folding of a metallopeptide
Authors: Gamba Ilaria , Rama Gustavo , Ortega-Carrasco Elisabeth , Berardozzi Roberto , Sánchez-Pedregal Víctor M. , Di Bari Lorenzo , Maréchal Jean-Didier , Vázquez M. Eugenio , Vázquez López Miguel
Published: October 2015

We have studied the main factors influencing the folding pathway and chiral control of a family of tris(bipyridyl) peptidic ligands in the presence of Fe(ii) ions both by experimental techniques and molecular modeling tools.
A novel greenish yellow-orange red Ba3Y4O9:Bi3+,Eu3+ phosphor with efficient energy transfer for UV-LEDs
Authors: Li Kai , Lian Hongzhou , Shang Mengmeng , Lin Jun
Published: October 2015

A series of novel color-tunable Ba3Y4O9:Bi3+,Eu3+ phosphors have been prepared via the high-temperature solid-state reaction route and investigated.
Porous P-doped graphitic carbon nitride nanosheets for synergistically enhanced visible-light photocatalytic H2production
Authors: Ran Jingrun , Ma Tian Yi , Gao Guoping , Du Xi-Wen , Qiao Shi Zhang
Published: October 2015

Porous P-doped g-C3N4nanosheets prepared by combining P doping and thermal exfoliation exhibit a high visible-light photocatalytic H2-production activity of 1596 μmol h−1g−1and a quantum efficiency of 3.56% at 420 nm.
2D-patterning of self-assembled silver nanoisland films
Authors: Chervinskii Semen , Reduto Igor , Kamenskii Alexander , Mukhin Ivan S. , Lipovskii Andrey A.
Published: October 2015

The paper is dedicated to the recently developed by the authors technique of silver nanoisland growth, allowing self-arrangement of 2D-patterns of nanoislands. The technique employs silver out-diffusion from ion-exchanged glass in the course of annealing in hydrogen. To modify the silver ion distribution in the exchanged soda-lime glass we included the thermal poling of the ion-exchanged glass with a profiled electrode as an intermediate stage of the process. The resulting consequence consists of three steps: (i) during the ion exchange of the glass in the AgxNa1−xNO3(x= 0.01–0.15) melt we enrich the subsurface layer of the glass with silver ions; (ii) under the thermal poling, the electric field displaces these ions deeper into the glass under the 2D profiled anodic electrode, the displacement is smaller under the hollows in the electrode where the intensity of the field is minimal; (iii) annealing in a reducing atmosphere of hydrogen results in silver out-diffusion only in the regions corresponding to the electrode hollows, as a result silver forms nanoislands following the shape of the electrode. Varying the electrode and mode of processing allows governing the nanoisland size distribution and self-arrangement of the isolated single nanoislands, pairs, triples or groups of several nanoislands—so-called plasmonic molecules.
A bilateral electrochemical hydrogen pump reactor for 2-propanol dehydrogenation and phenol hydrogenation
Authors: Huang Shiqi , Wu Xuemei , Chen Wei , Wang Tao , Wu Yao , He Gaohong
Published: October 2015

In this paper, an EHP is proposed for use as a reactor to complete organic dehydrogenation and biomass derivative hydrogenation simultaneously.
Chemical and enzymatic modification of sophorolipids
Authors: Delbeke E. I. P. , Movsisyan M. , Van Geem K. M. , Stevens C. V.
Published: October 2015

This review focuses on the chemical and enzymatic modification of sophorolipid biosurfactants into new derivatives.
Intermediate oxiranes in the base-catalyzed depolymerisation of lignin
Authors: Lankau Timm , Yu Chin-Hui
Published: October 2015

Quantum calculations show that βO4′ links break in two ways; the carbanion route yields monomers, the alkoxide route facilitates repolymerisation.
An analysis of the chemical, physical and reactivity features of MgO–SiO2 catalysts for butadiene synthesis with the Lebedev process
Authors: Ochoa Juliana Velasquez , Bandinelli Claudia , Vozniuk Olena , Chieregato Alessandro , Malmusi Andrea , Recchi Carlo , Cavani Fabrizio
Published: October 2015

In MgO–SiO2 catalysts for the transformation of bio-ethanol into butadiene, the generation of more selective sites is achieved by the dispersion of isolated Si4+ atoms in MgO.
Self-powered switch-controlled nucleic acid extraction system
Authors: Han Kyungsup , Yoon Yong-Jin , Shin Yong , Park Mi Kyoung
Published: October 2015

We have developed a Self-powered Switch-controlled Nucleic acid Extraction System (SSNES) to overcome the limitation of LOC technology in POC applications. The SSNES have a potential to be widely used as powerless, fully-disposable and user-friendly system for DNA extraction.
The synthesis and curing kinetics study of a new fluorinated polyurethane with fluorinated side chains attached to soft blocks
Authors: Li Lingling , Wang Xia , Li Zan , Bi Wei , Li Ying , Qi Yuanchun , Dong Qingzhi
Published: October 2015

Fluorinated polyurethane with fluorinated side chains attached to soft blocks was successfully synthesized, which exhibited unique properties. And also the curing kinetics was studied using a rotational rheometer.
Poly(amic acid) salt-stabilized silver nanoparticles as efficient and recyclable quasi-homogeneous catalysts for the aqueous hydration of nitriles to amides
Authors: Li Jun , Tang Guannan , Wang Yuchen , Wang Ya , Li Zixi , Li Hengfeng
Published: October 2015

The reversible pH-response of the Ag–PAAS catalyst allows it to catalyze the selective hydration of various nitriles quasi-homogeneously in water and to be easily recovered by simply adjusting the pH value of the solution.
Hot off the press
Authors: Hill Robert A. , Sutherland Andrew
Published: October 2015

A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as salviaprione from Salvia prionitis.
AIBN/NaBr-promoted aerobic oxidation of benzylic alcohols via a radical process
Authors: Liu Chengkou , Fang Zheng , Yang Zhao , Li Qingwen , Guo Shiyu , Guo Kai
Published: October 2015

A new aerobic alcohol oxidation system of AIBN/NaBr was described for the first time. Moreover, a radical mechanism was assumed and confirmed.
Photoswitchable anticancer activity via trans–cis isomerization of a combretastatin A-4 analog
Authors: Sheldon Jonathon E. , Dcona M. Michael , Lyons Charles E. , Hackett John C. , Hartman Matthew C. T.
Published: October 2015

An azobenzene version of combretastatin A-4 is a highly potent anticancer drug that exhibits enhanced potency with light and automatic turn off of activity over time.
Microstructure construction and composition modification of CeO2 macrospheres with superior performance
Authors: Jiang Shuaiyu , Yang Xiaodan , Chen Jun , Xing Xianran , Wang Lianzhou , Yu Ranbo
Published: October 2015

With controlled hydrolysis of DMF, condensed and hollow macrospherical Ce(COOH)3 precursors are selectively produced. Upon calcination the spherical CeO2 with high specific surface area, oxygen storage capacity and the Cr(vi) adsorption ability are obtained.
New reduction mechanism of CO dimer by hydrogenation to C2H4 on a Cu(100) surface: theoretical insight into the kinetics of the elementary steps
Authors: Ou Lihui , Long Wenqi , Chen Yuandao , Jin Junling
Published: October 2015

An alternative reaction pathway for the production of C2H4 through the OCCO* intermediate from CO dimerization is provided in this mechanistic study.
Facile synthesis of mesoporous FeNi-alloyed carbonaceous microspheres as recyclable magnetic adsorbents for trichloroethylene removal
Authors: Liu Xinxin , Zhang Dong , Guo Biao , Qu Yue , Tian Ge , Yue Huijuan , Feng Shouhua
Published: October 2015

Magnetic separable porous FeNi/CS composites achieved through a one-pot hydrothermal carbonization method can reversibly adsorb TCE contaminant from wastewater.
Ionic liquid assisted nanofabrication of ferromagnetic Co-doped La–Ce ferrites
Authors: Shikha Preet , Kang Tejwant Singh , Randhawa B. S.
Published: October 2015

The effect of Co(ii) doping on the various physico-chemical properties of La–Ce ferrites synthesized via a hydrothermal route using an ILS as a structure directing template is investigated. The doped NPs are found to be magnetically improved with doping.
Preparation and microwave absorption properties of multi-walled carbon nanotubes decorated with Ni-doped SnO2nanocrystals
Authors: Lin Ling , Xing Honglong , Shu Ruiwen , Wang Lei , Ji Xiaoli , Tan Dexin , Gan Ying
Published: October 2015

Ni-doped SnO2@MWCNTs composites were synthesized by a facile one-step hydrothermal method, and had a maximum reflection loss of −39.2 dB at 8.2 GHz and the absorption bandwidth of reflection loss lower than −10 dB was 3.6 GHz.
Low-viscosity ether-functionalized pyrazolium ionic liquids based on dicyanamide anions: properties and application as electrolytes for lithium metal batteries
Authors: Shen Shumin , Fang Shaohua , Qu Long , Luo Dong , Yang Li , Hirano Shin-ichi
Published: October 2015

Two ether-functionalized pyrazolium ionic liquids based on dicyanamide anion were used as new electrolytes in Li/LiFePO4 cells.
Detection of nonfluorescent cyhalothrin in honey by a spheral SiO2-based particle coating with thin fluorescent molecularly imprinted polymers film
Authors: Gao Lin , Li Xiuying , Li Chunxiang , Yan Yongsheng
Published: October 2015

In this study, we report a general protocol for making core–shell SiO2@KH570-MIP based on the surface modification of SiO2 beads for the selective fluorescence detection of ultra trace cyhalothrin.
Theoretical study of the BINOL–zinc complex-catalyzed asymmetric inverse-electron-demand imino Diels–Alder reaction: mechanism and stereochemistry
Authors: Li Weiyi , Yang Na , Lv Yajing
Published: October 2015

The enantioselectivity originates from the hindrance of a BINOL ligand, and the exo-selectivity is achieved by the favored electrophilic/nucleophilic interaction.
A simple and room temperature sol–gel process for the fabrication of cobalt nanoparticles as an effective catalyst for carbon nanotube growth
Authors: Zulkapli Nor Najihah , Azam Mohd Asyadi , Zubir Nik Mohamad Azren Mohd , Ithnin Nur Azura , Rashid Mohd Warikh Abd
Published: October 2015

Cobalt catalyst thin films were prepared on silicon wafers using a spin coating process.
Bioinspired ribbed hair arrays with robust superhydrophobicity fabricated by micro/nanosphere lithography and plasma etching
Authors: Wang Dapeng , Zhao Aiwu , Li Lei , He Qinye , Guo Hongyan , Sun Henghui , Gao Qian
Published: October 2015

Bioinspired ribbed hair arrays have been fabricated by colloidal lithography and plasma etching. After fluorination, the ribbed hair arrays with remarkable superhydrophobicity can present self cleaning performance and a large loading capacity.
Molecularly imprinted polymer for selective extraction and simultaneous determination of four tropane alkaloids from Przewalskia tangutica Maxim. fruit extracts using LC-MS/MS
Authors: Zeng Shaomei , She Yongxin , Jiao Bining , Liu Guangyang , Wang Jing , Su Xuesu , Ma Xinbing , Jin Maojun , Jin Fen , Wang Shanshan
Published: October 2015

A class-specific molecularly imprinted polymer (MIP) for selectively extracting four tropane alkaloids has been prepared using anisodine, methacrylic, and trimethylolpropane trimethacrylate as template, functional monomer and crosslinker, respectively.
A stable Ni/SBA-15 catalyst prepared by the ammonia evaporation method for dry reforming of methane
Authors: Zhang Qiulin , Wang Mingzhi , Zhang Tengfei , Wang Yiru , Tang Xiaosu , Ning Ping
Published: October 2015

Coking and sintering were inhibited simultaneously by the strong metal–support interactions.
4-Mercaptophenyldiphenylphosphine as linker to immobilize Pd onto the surface of magnetite nanoparticles. Excellent catalytic efficiency of the system after partial linker removal
Authors: Guarnizo A. , Angurell I. , Rossell M. D. , Llorca J. , Muller G. , Seco M. , Rossell O.
Published: October 2015

The catalytic efficiency of Pd nanoparticles supported on Fe3O4 NPs strongly improves after partial removal of the Sdp linker.
Copper-catalyzed intramolecular dehydrogenative cyclization: direct access to sensitive formyl-substituted imidazo[1,2-a]pyridines
Authors: Zhai Li-Hai , Guo Li-Hong , Sun Bai-Wang
Published: October 2015

A direct method for the synthesis of formyl-substituted imidazo[1,2-a]pyridines was achieved easily from cyclization of aminopyridines and cinnamaldehydes via copper catalysis.
High quantum-yield luminescent MoS2 quantum dots with variable light emission created via direct ultrasonic exfoliation of MoS2 nanosheets
Authors: Wu Jing-Yuan , Zhang Xiao-Yang , Ma Xiao-Dan , Qiu Yun-Ping , Zhang Tong
Published: October 2015

MoS2 QDs with high quantum-yield, variable photoluminescence emission properties and good biocompatibility are studied and applied to the bio-imaging field.
Mechanistic insight of TiCl4catalyzed formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 1,3-dielectrophiles
Authors: Nisa Riffat Un , Maria Maria , Wasim Fatima , Mahmood Tariq , Ludwig Ralf , Ayub Khurshid
Published: October 2015

The mechanism of TiCl4mediated formal [3 + 3] cyclization of 1,3-bis(silyl enol ethers) with 1,3-dielectrophiles is studied at the B3LYP level of density functional theory (DFT) to rationalize the experimental regioselectivity.
Fe-doped anatase TiO2/carbon composite as an anode with superior reversible capacity for lithium storage
Authors: Lai Yanqing , Liu Wenwen , Fang Jing , Qin Furong , Wang Mengran , Yu Fan , Zhang Kai
Published: October 2015

This paper reports an economic and effective wet chemistry process to prepare Fe-doped anatase TiO2/carbon composite with excellent performance in lithium-ion batteries.
Insights into dye design for efficient p-type photoelectrodes: effect of oligothiophene length between the donor and the NiO surface
Authors: Wu Fei , Zhao Shangbi , Zhong Cheng , Song Qunliang , Zhu Linna
Published: October 2015

T4 with tetra-thiophene as a spacer show the highest performance, while further increased oligothiophene length result in decreased efficiency.
Synthesis of polyamides using palladium-on-carbon (Pd/C) as a heterogeneous, reusable and ligand-free catalytic system
Authors: Satapathy Anilkumar , Gadge Sandip T. , Sasaki Takehiko , Bhanage Bhalchandra M.
Published: October 2015

Polyamide has been synthesized by using Pd/C as a heterogeneous, phosphine-free and reusable catalytic system. The catalyst solves the basic problem of catalyst recovery and furnishes good to excellent yield of polyamides.
Hybrid TiO2–acetylacetonate amorphous gel-derived material with stably adsorbed superoxide radical active in oxidative degradation of organic pollutants
Authors: Sannino Filomena , Pernice Pasquale , Imparato Claudio , Aronne Antonio , D'Errico Gerardino , Minieri Luciana , Perfetti Marco , Pirozzi Domenico
Published: October 2015

˙O2−superoxide radicals are firmly adsorbed on the surface of the hybrid material giving oxidative degradation without any light irradiation.
Enhanced non-linear viscoelastic properties of TATB-based polymer bonded explosives filled with hybrid graphene/multiwalled carbon nanotubes
Authors: Lin Congmei , He Guansong , Liu Jiahui , Huang Zhong , Pan Liping , Zhang Jianhu , Liu Shijun
Published: October 2015

A remarkable synergetic effect between graphene and multiwalled carbon nanotubes in improving the creep resistance are observed for polymer bonded explosives.
Carborane-based design of a potent vitamin D receptor agonist
Authors: Otero Rocio , Seoane Samuel , Sigüeiro Rita , Belorusova Anna Y. , Maestro Miguel A. , Pérez-Fernández Roman , Rochel Natacha , Mouriño Antonio
Published: October 2015

The development of a promising clinical antitumor vitamin D analog possessing a side-chain o-carborane cluster that efficiently binds to VDR by unconventional dihydrogen bonding (BH⋯HN) is described.
Rhodium-catalyzed oxidative amidation of allylic alcohols and aldehydes: effective conversion of amines and anilines into amides
Authors: Wu Zhao , Hull Kami L.
Published: October 2015

The rhodium-catalyzed oxidative amidation of allylic alcohols and aldehydes is reported.
Analytical nuclear gradients for the range-separated many-body dispersion model of noncovalent interactions
Authors: Blood-Forsythe Martin A. , Markovich Thomas , DiStasio Robert A. , Car Roberto , Aspuru-Guzik Alán
Published: October 2015

This work develops analytical forces for the many-body dispersion model of collective van der Waals interactions.
Latent harmony in dicarbon between VB and MO theories through orthogonal hybridization of 3σg and 2σu
Authors: Zhong Ronglin , Zhang Min , Xu Hongliang , Su Zhongmin
Published: October 2015

Besides the classic double bond scheme, several novel schemes have been proposed to describe the nature of the chemical bond in dicarbon, including a quadruple bond and a singlet diradical state. The results presented here show a harmony between MO and VB theories.
Zwitterionic and biradicaloid heteroatomic cyclopentane derivatives containing different group 15 elements
Authors: Hinz Alexander , Schulz Axel , Villinger Alexander
Published: October 2015

The formal cyclopentane-1,3-diyl derivatives [E1(μ-NTer)2({E2C} = NDmp)] (Ter = 2,6-dimesityl-phenyl, Dmp = 2,6-dimethylphenyl) were prepared by 1,1-insertion of CNDmp into the N–E2 bond of [E1(μ-NTer)2E2] (E1 = N, P; E2 = P, As).
The first intermolecular interrupted imino-Nazarov reaction: expeditious access to carbocyclic nucleoside analogues
Authors: William Ronny , Leng Wei Lin , Wang Siming , Liu Xue-Wei
Published: October 2015

The first intermolecular interrupted imino-Nazarov reaction with silylated pyrimidine derivatives as nucleophile has been developed, furnishing carbocyclic nucleoside analogues in a one-pot operation.
Mechanistic studies on the addition of hydrogen to iridaepoxide complexes with subsequent elimination of water
Authors: Doyle Lauren E. , Piers Warren E. , Borau-Garcia Javier , Sgro Michael J. , Spasyuk Denis M.
Published: October 2015

Iridium complexes of the PCsp2P ligand in which the donors are linked by 2,3-benzo[b]thiophene groups engage in the cooperative activation of N2O and the resulting iridaepoxides can be treated with dihydrogen to effect elimination of water and regeneration of the starting iridium complex.
Direct structural evidence of commensurate-to-incommensurate transition of hydrocarbon adsorption in a microporous metal organic framework
Authors: Banerjee Debasis , Wang Hao , Gong Qihan , Plonka Anna M. , Jagiello Jacek , Wu Haohan , Woerner William R. , Emge Thomas J. , Olson David H. , Parise John B. , Li Jing
Published: October 2015

Structural evidence of commensurate-to-incommensurate transition of linear hydrocarbon molecules in a MOF.
Aging mechanism in model Pickering emulsion
Authors: Fouilloux Sarah , Malloggi Florent , Daillant Jean , Thill Antoine
Published: October 2015

We study the stability of a model Pickering emulsion system using fluorinated oil and functionalized silica nanoparticles.
Supramolecular gels based on boronate esters and imidazolyl donors
Authors: Luisier N. , Scopelliti R. , Severin K.
Published: October 2015

Dative boron–nitrogen bonds can be used for the controlled assembly of boronate esters and N-donor ligands.
Efficient hole transport layers with widely tunable work function for deep HOMO level organic solar cells
Authors: Cheng Jiaqi , Xie Fengxian , Liu Yongsheng , Sha Wei E. I. , Li Xinchen , Yang Yang , Choy Wallace C. H.
Published: October 2015

An efficient and wide work function tuning approach of hole transport layers for deep HOMO level organic solar cells.
Fast setting and anti-washout injectable calcium–magnesium phosphate cement for minimally invasive treatment of bone defects
Authors: Chen Fangping , Song Zhiyan , Liu Changsheng
Published: October 2015

The fa-ICMPC exhibited potent anti-washout properties, fast setting, improved injectability, good biodegradability and osteoconductivity.
Combined experimental–theoretical study of the optoelectronic properties of non-stoichiometric pyrochlore bismuth titanate
Authors: Noureldine Dalal , Lardhi Sheikha , Ziani Ahmed , Harb Moussab , Cavallo Luigi , Takanabe Kazuhiro
Published: October 2015

A combination of experimental and computational methods was applied to investigate the crystal structure and optoelectronic properties of the non-stoichiometric pyrochlore Bi2−xTi2O7−1.5x.
Modulation of the fluorescence properties of diketopyrrolopyrroles via various electron-rich substituents
Authors: Purc Anna , Banasiewicz Marzena , Glodkowska-Mrowka Eliza , Gryko Daniel T.
Published: October 2015

Electron-donating functionalities allow modulation of the emission properties of diketopyrrolopyrroles.
Frequency stability and phase noise performance of X‐band to Ka‐band active multiplier
Authors: Bara‐Maillet R. , Creedon D.L. , Parker S.R. , Le Floch J.‐M. , Tobar M.E.
Published: October 2015

The performance of an active frequency doubler used to generate a pump signal for a solid‐state microwave amplification by stimulated emission of radiation (MASER) based on paramagnetic impurity ions in sapphire is reported. The frequency doubler has been characterised in terms of phase noise, power dependence and frequency stability (Allan variance) for an output frequency range between 20 and 40 GHz. With the measurement system referenced to a 10 MHz hydrogen MASER, the doubler exhibits a single sideband phase noise of ∼−108 dBc/Hz at 1 Hz offset frequency, from which an upper limit fractional frequency instability of about 2 × 10−16 at 1 s integration time is estimated.
Super‐resolution radar imaging using fast continuous compressed sensing
Authors: Yang Lei , Zhou Jianxiong , Xiao Huaitie
Published: October 2015

A continuous compressed sensing method for 2D radar imaging is adopted. Atomic norm minimisation is used for sparse signal recovery and the property of the dual optimal solution is utilised to generate a super‐resolution radar image. A feasible first‐order algorithm based on the alternating direction method of multipliers is presented for problem solving where the primal and dual optimal solution can be obtained simultaneously. A fast implementation is also developed by exploiting the low rank structure of the subproblem. Experimental results on real data validate the effectiveness of the proposed algorithm.
Rail‐to‐rail regulating voltage‐controlled oscillator with low supply and ground noise sensitivity
Authors: Ko Jaehong , An Chang‐Ho , Kwon Chan‐Keun , Kim Soo‐Won , Kim Chulwoo
Published: October 2015

A rail‐to‐rail (R‐to‐R) regulating voltage‐controlled oscillator (VCO) is employed to generate multiple‐phase clocks for clock and data recovery in a display driver IC (DDI). To achieve a low supply and ground noise sensitivity, the proposed R‐to‐R regulating method generates VSP and VSN as the supply and the ground of the VCO instead of VDD and VSS. By applying the proposed method, the frequency–VDD variation rate of the VCO (%−fVCO/%−VDD) changes from 3.5%−fVCO/1%−VDD to 0.0073%−fVCO/1%−VDD within the Vctrl range of 0.5–1.2 V. The DDI is fabricated in a 1P6M 0.18 μm 1.8 V CMOS technology for the interface block and in a 1.6 μm 18 V CMOS technology for the DAC. The R‐to‐R regulating VCO has a tuning range of 140–240 MHz with linear and small gain (KVCO) characteristics, and is suitable for the phase‐locked loop used in flat‐panel display interfaces that operate from 0.3 to 2 Gbits/s.
Enhanced efficiency for wireless power transmission using an auxiliary loop on ferrite in metallic environment
Authors: Park Byung‐Chul , Lee Jeong‐Hae
Published: October 2015

An enhanced magnetic shield consisting of an auxiliary loop on a ferrite in a metallic environment at 6.78 MHz is described. Utilising an in‐phase current of the auxiliary loop on the ferrite, the performances such as power transfer efficiency and the coupling coefficient are improved. The conventional shielding method that uses high‐permeability ferrites has a limitation on the utilisation because of their high magnetic loss tangent. However, the proposed method using the auxiliary loop coated on the ferrite can provide better efficiency than the conventional method. In particular, at distance of 20 cm, the measured efficiency is improved by 30% after applying the auxiliary loop to the ferrite. The proposed method is considered to be useful to wireless power transmission systems having a ground plane.
Affine‐scale invariant feature transform and two‐dimensional principal component analysis: a novel framework for affine and scale invariant face recognition
Authors: A Vinay. , Shekhar Vinay S. , Kumar C Akshay , S Natarajan. , Murthy K.N. Balasubramanya
Published: October 2015

Face recognition (FR) is one of the most effervescent fields of research with extensive applications that span numerous domains, and it stands resolutely as one of the most challenging problems in computer vision. The accuracy of FR systems is severely affected when two images under consideration for a match, vary in their scale and/or affine angles. The prevalent affine and scale invariant recognition systems have been predominantly developed only for objects, and hence in this study, the authors propose a novel approach for faces based on the affine‐SIFT (ASIFT) and two‐dimensional principal component analysis (2DPCA) techniques, to accomplish the formidable task of facial image recognition, invariant of scale and affine angles, i.e. the ability to simulate with enough accuracy, all the distortions caused by the differences in resolution and the variation of the camera optical axis direction. In the formulation of ASIFT‐2DPCA, they investigate three different variants of 2DPCA: classical 2DPCA, quaternion 2DPCA and sparse 2DPCA to gauge as to which is more effective. The authors'experimentations will demonstrate that the proposed approach can robustly handle affine and scale variations, and hence provide better accuracy and matching performance than the state‐of‐the‐art methodologies.
Content‐based image retrieval system via sparse representation
Authors: Mohamadzadeh Sajad , Farsi Hassan
Published: October 2015

The aim of image retrieval systems is to automatically assess, retrieve and represent relative images‐based user demand. However, the accuracy and speed of image retrieval are still an interesting topic of many researches. In this study, a new method based on sparse representation and iterative discrete wavelet transform has been proposed. To evaluate the applicability of the proposed feature‐based sparse representation for image retrieval technique, the precision at percent recall and average normalised modified retrieval rank are used as quantitative metrics to compare different methods. The experimental results show that the proposed method provides better performance in comparison with other methods.
Electrical magnetic hybrid power quality compensation system for V/V traction power supply system
Authors: Chen Baichao , Zhang Chenmeng , Zeng Wenjun , Xue Gang , Tian Cuihua , Yuan Jiaxin
Published: October 2015

To solve power quality problem in V/V traction power supply system, a novel electrical magnetic hybrid power quality compensation system based on railway power conditioner (RPC) and magnetic static var compensator (MSVC) is proposed in this study. The RPC is only used to transfer active power and suppressing harmonics. The MSVC is used to compensate reactive power and suppress 3rd and 5th harmonic currents. The proposed hybrid compensation system will reduce the capacity as well as the DC‐link voltage of RPC. The principle of negative, reactive and harmonic currents compensation is analysed first. And then, a collaborative control strategy is proposed to make the compensation system have a fast respond speed. At last the simulation and experiment results have verified the proposed structure and its control strategy effectively.
Simple carrier‐based pulse‐width modulation scheme for three‐phase four‐wire neutral‐point‐clamped inverters with neutral‐point balancing
Authors: Luo Fei , Loo Ka‐Hong , Lai Yuk‐Ming
Published: October 2015

Neutral‐point‐clamped (NPC) three‐level inverters can drive a combination of single‐ and three‐phase loads or non‐linear in a three‐phase four‐wire distribution system. However, an intrinsic problem with NPC three‐level inverters is the fluctuation in the neutral‐point (NP) voltage. In this study, a dynamic model of the NP voltage in a three‐phase four‐wire system will be analysed and developed. On the basis of this model, a simple carrier‐based pulse‐width modulation scheme for NP balancing is proposed. The proposed scheme decouples the NP voltage balancing from the necessity to control phase voltages, and controls the NP voltage without introducing zero‐sequence voltage, thus the scheme can be applied to a general NPC voltage source inverter. The effectiveness of the proposed modulation scheme is verified by both simulation and experimental results. Finally, these results are compared with those reported in the literature.
High step‐down interleaved buck converter with low voltage stress
Authors: Esteki Morteza , Poorali Behzad , Adib Ehsan , Farzanehfard Hosein
Published: October 2015

This study presents a four‐phase interleaved buck converter with low voltage stress and high step‐down conversion ratio. The proposed converter provides an extended duty cycle and low voltage stress for switches and diodes, in high step‐down applications. This makes it possible to use switches with lower voltage rating and thus reduce both switching and conduction losses to improve the overall efficiency. Extremely low output current ripple and continuous input current are two other advantages of the proposed converter. Also, the output current can be shared between interleaved modules without using additional current sharing control technique due to charge balance of input and blocking capacitors. All these benefits are obtained without adding any active auxiliary component or using transformers. The experimental results from a prototype of the proposed converter designed for 400–24 V, operating at 0.5 kW, verify the theoretical analysis.
Optimised harmonic elimination modulation extended to four‐leg neutral‐point‐clamped inverter
Authors: Sharifzadeh Mohammad , Sheikholeslami Abdolreza , Vahedi Hani , Ghoreishy Hoda , Labbé Philippe‐Alexandre , Al‐Haddad Kamal
Published: October 2015

Uninterruptible power supply (UPS) is the promising candidate to ensure high quality of delivering power from renewable energy resources to the AC loads especially sensitive and critical ones. In this study, optimised harmonic elimination modulation technique is extended to four‐leg neutral‐point‐clamped (NPC) with neutral point voltage balancing and it has been experimentally validated. It is demonstrated that by controlling the fourth leg to eliminate more harmonics while operating at low switching frequency makes the four‐wire NPC an ideal candidate for an UPS application in energy conversion systems. Non‐triplen, 5th to 23rd harmonics orders from the output voltage waveforms are eliminated by optimally computing the switching angles for phase legs. Moreover, switching angles computed for the fourth leg are also considered to help removing triplen harmonics containing 3rd, 9th, 15th, and 21st orders from phase voltages. It is mathematically proved that the designed selective harmonic elimination technique ensures the neutral point voltage balancing. The obtained experimental results confirm the proper performance of the proposed technique in supplying symmetrical/asymmetrical loads from renewable energy resources while keeping the inverter neutral point voltage balanced.
Generalised switching scheme for a space vector pulse‐width modulation‐based N‐level inverter with reduced switching frequency and harmonics
Authors: Jana Kartick Chandra , Biswas Sujit K.
Published: October 2015

This study presents a generalised online switching scheme for a space vector pulse‐width modulation (SVPWM)‐based multilevel inverter of any voltage level. The proposed SVPWM algorithm implements a generalised three‐(similar to five) and seven‐segment switching scheme using the three most desired switching states and one suitable redundant state for each triangle. In addition, a novel three‐segment and seven‐segment switching scheme has been proposed, which eliminates extra switching commutations and hence minimises the switching frequency of the devices while reducing harmonics. The proposed modulation algorithm using the generalised expressions is implemented online. The performance of the proposed novel algorithm for N‐level inverter is tested experimentally on a five‐level cascaded inverter at various fundamental frequencies and the experimental results are verified with the simulation results.
Subspace‐based super‐resolution algorithm for ground moving target imaging and motion parameter estimation
Authors: Ma Jingtao , Tao Haihong , Huang Penghui
Published: October 2015

For synthetic aperture radar (SAR), most conventional algorithms provide a good performance in ground moving target imaging based on Fourier transform (FT). However, when multiple moving targets with the close centres exist, the conventional algorithms may suffer from the performance degradation since the spectra resolution of FT may be limited by the time samples. To address this issue, a super‐resolution motion parameter estimation algorithm is proposed in this study. First, Keystone transform is applied to correct the linear range walk. Then the range curvature is compensated by the matched function with respect to the platform velocity. After performing the compensation of linear range walk and range curvature, the energy of a ground moving target is focused on one range cell, and then a first‐order discrete polynomial‐phase transform is applied to transform the quadratic phase signal into a single tone. After applying the smoothing technique to construct the covariance matrix of full rank, the multiple signal classification algorithm is utilised to estimate the target cross‐ and along‐track velocities, which can significantly improve the motion parameter resolution performance compared with the FFT‐based algorithms. The real SAR data processing results are used to validate the effectiveness and feasibility of the proposed algorithm.
Target and reflecting surface height joint estimation in low‐angle radar
Authors: Wang Shenghua , Cao Yunhe , Su Hongtao , Wang Yu
Published: October 2015

According to the model of multipath propagation in low‐angle tracking, the reflecting surface height has significant influence on the measurement precision of the target height. In this study, a novel method for the joint estimation of the target height and the reflecting surface height is proposed based on multichannel digital array radar. To reduce the computational burden of the proposed method, the projection gradient method instead of two‐dimensional search is adopted to minimise the cost function. Moreover, the Cramer–Rao bound of the proposed method is also derived in this study. At last, simulations and practical data processing results show that the proposed method has a good estimation precision.
Separation of adjacent interharmonics using maximum energy retrieving algorithm
Authors: Lin Hsiung Cheng
Published: October 2015

It is known that flickers and interharmonics have an inherent relationship, and the magnitude of a voltage can fluctuate as the signal contains interharmonics. In particular, flicker or modulation will occur when the interharmonic is close to a harmonic (or fundamental) frequency. Current spectrum separation approaches can detect harmonics and main interharmonics effectively, but they may not be applicable for the situation of adjacent interharmonics from either divergence effect, sensitive spectral leakage or other drawbacks. For this reason, this study develops a strategy of maximum energy retrieving (MER) method to distinguish and identify those interharmonics which are adjacent to fundamental or harmonics in power systems. Based on the appropriate selection of sampling window length using discrete Fourier transform (DFT), neighbouring dispersed energy can be collected to retrieve its original amplitude value. The frequency component can be thus determined simultaneously when the total collected energy reaches the maximum. The MER implementation can be converged within only several iteration loops where parallel DFT computation is required before the convergent process. The numerical example is used to verify the effectiveness of the proposed approach in term of reliability and accuracy.
Classification of the nonlinear dynamics in an initially curved bistable micro/nano‐electro‐mechanical system resonator
Authors: Tajaddodianfar Farid , Hairi Yazdi Mohammad Reza , Nejat Pishkenari Hossein , Maani Miandoab Ehsan , Ouakad Hassen M.
Published: October 2015

The nonlinear dynamics of a bistable micro/nano‐electro‐mechanical system resonator composed of an arch‐shaped microbeam is investigated. The initially curved microbeam is actuated through a combined DC and AC electrostatic parallel plate field. A single degree of freedom model obtained using the Galerkin's decomposition method with distributed electrostatic force is implemented in order to investigate the resonator dynamics near its primary resonance. According to the shape of the potential energy function which depends on the system parameters, the nonlinear dynamics of the system are classified into certain categories. The appearance of various nonlinear phenomena including dynamic snap‐through, dynamic pull‐in, chaotic or large amplitude vibrations, hysteresis and softening‐type behaviours are discussed within the introduced categories. A typical case scrutinised on detail, showing consequent snap‐through instabilities which are responsible for transitions between the present stable configurations of the arch‐shaped microbeam. Details of the resulting hysteresis loop governing these transitions are discussed. Moreover, discussion is provided about the formation of the hysteresis loops which can affect the filtering functionality of the proposed bistable MEMS resonator.
Convenient and green soft chemical route to cuprous oxide films and their visible‐light photocatalytic properties
Authors: Zheng Haiyan , Li Qing , Zhang Yongping , Qin Lizhao , Lin Hua , Nie Ming
Published: October 2015

Cuprous oxide (Cu2O) films have been synthesised by a convenient and green soft chemical route at room temperature. The films were obtained through the chemical reduction of copper acetate by ascorbic acid in solutions with ethylene glycol and deionised water. X‐ray diffraction, energy‐dispersive X‐ray spectrometry, scanning electron microscopy (SEM), atomic force microscopy, as well as UV–Vis spectroscopy (UV‐Vis) were used to characterise the resulting films. It was obvious from the SEM image that the obtained films were composed of nanosphere particles with a size of 100–400 nm. The photocatalytic activity of degradation of methyl orange (MO) of the obtained Cu2O films, H2O2 and H2O2/Cu2O films system under visible light irradiation was also investigated. The results have shown that the system exhibits high catalytic ability under visible light irradiation. Also, there was a strong synergistic effect between the obtained Cu2O films and H2O2 when the system was used to degrade MO.
Fabrication and characterisation of field‐effect transistor‐type pressure sensor with metal–oxide–semiconductor/microelectromechanical systems processes
Authors: Kim Byung‐Min , Kim Bum‐Joon , Kim Jung‐Sik
Published: October 2015

A microfield‐effect transistor pressure sensor has been fabricated using conventional complementary metal–oxide–semiconductor process and microelectromechanical systems technology. The sensor platform consisted of a field‐effect transistor (FET) device, electrode and Si diaphragm. Six lithography masks were prepared to develop the sensor fabrication process for arsenic ion implantation and diffusion, gate insulation layer (SiO2), gate metal, metal interconnection, passivation layer and bulk micromachining patterns. Pt/Ti thin films as the gate metal, interconnection and electrodes were deposited by DC/radio frequency magnetron sputtering, and patterned and etched using the reactive‐ion etching process. The channel length and width between the source and the drain were approximately 10 and 5500 μm (W :L ratio = 550:1), respectively. The pressure sensor produced a change in current when pressure was applied to the sensing element and the electrical circuit was used to convert the current variation of the pressure sensor to a voltage output. The sensor response was measured using a voltage follower circuit to determine the change in drain current. The fabricated FET pressure sensor showed an almost perfect linear response for the applied pressure in the range 0–1200 kPa. The experimental results have shown that the pressure sensor had a sensitivity of 0.0096 μA/kPa.