bluuebunny/crossref_metadata_2025 huggingface dataset:
Gd-metallofullerenol nanomaterial as non-toxic breast cancer stem cell-specific inhibitor
Authors: Liu Ying , Chen Chunying , Qian Pengxu , Lu Xuefei , Sun Baoyun , Zhang Xiao , Wang Liming , Gao Xingfa , Li Han , Chen Zhiyun , Tang Jinglong , Zhang Weijie , Dong Jinquan , Bai Ru , Lobie Peter E. , Wu Qingfa , Liu Suling , Zhang Huafeng , Zhao Feng , Wicha Max S. , Zhu Tao , Zhao Yuliang
Published: January 2015

The contemporary use of nanomedicines for cancer treatment has been largely limited to serving as carriers for existing therapeutic agents. Here, we provide definitive evidence that, the metallofullerenol nanomaterial Gd@C82(OH)22, while essentially not toxic to normal mammary epithelial cells, possesses intrinsic inhibitory activity against triple-negative breast cancer cells. Gd@C82(OH)22 blocks epithelial-to-mesenchymal transition with resultant efficient elimination of breast cancer stem cells (CSCs) resulting in abrogation of tumour initiation and metastasis. In normoxic conditions, Gd@C82(OH)22 mediates these effects by blocking TGF-β signalling. Moreover, under hypoxic conditions found in the tumour microenvironment, cellular uptake of Gd@C82(OH)22 is facilitated where it functions as a bi-potent inhibitor of HIF-1α and TGF-β activities, enhancing CSC elimination. These studies indicate that nanomaterials can be engineered to directly target CSCs. Thus, Gd-metallofullerenol is identified as a kind of non-toxic CSC specific inhibitors with significant therapeutic potential.
Different forms of effective connectivity in primate frontotemporal pathways
Authors: Petkov Christopher I. , Kikuchi Yukiko , Milne Alice E. , Mishkin Mortimer , Rauschecker Josef P. , Logothetis Nikos K.
Published: January 2015

It is generally held that non-primary sensory regions of the brain have a strong impact on frontal cortex. However, the effective connectivity of pathways to frontal cortex is poorly understood. Here we microstimulate sites in the superior temporal and ventral frontal cortex of monkeys and use functional magnetic resonance imaging to evaluate the functional activity resulting from the stimulation of interconnected regions. Surprisingly, we find that, although certain earlier stages of auditory cortical processing can strongly activate frontal cortex, downstream auditory regions, such as voice-sensitive cortex, appear to functionally engage primarily an ipsilateral temporal lobe network. Stimulating other sites within this activated temporal lobe network shows strong activation of frontal cortex. The results indicate that the relative stage of sensory processing does not predict the level of functional access to the frontal lobes. Rather, certain brain regions engage local networks, only parts of which have a strong functional impact on frontal cortex.
Dppa3 expression is critical for generation of fully reprogrammed iPS cells and maintenance of Dlk1-Dio3 imprinting
Authors: Xu Xingbo , Smorag Lukasz , Nakamura Toshinobu , Kimura Tohru , Dressel Ralf , Fitzner Antje , Tan Xiaoying , Linke Matthias , Zechner Ulrich , Engel Wolfgang , Krishna Pantakani D. V.
Published: January 2015

Reprogramming of mouse somatic cells into induced pluripotent stem cells (iPSCs) often generates partially reprogrammed iPSCs (pre-iPSCs), low-grade chimera forming iPSCs (lg-iPSCs) and fully reprogrammed, high-grade chimera production competent iPSCs (hg-iPSCs). Lg-iPSC transcriptome analysis revealed misregulated Dlk1-Dio3 cluster gene expression and subsequently the imprinting defect at the Dlk1-Dio3 locus. Here, we show that germ-cell marker Dppa3 is present only in lg-iPSCs and hg-iPSCs, and that induction with exogenous Dppa3 enhances reprogramming kinetics, generating all hg-iPSCs, similar to vitamin C (Vc). Conversely, Dppa3-null fibroblasts show reprogramming block at pre-iPSCs state and Dlk1-Dio3 imprinting defect. At the molecular level, we show that Dppa3 is associated with Dlk1-Dio3 locus and identify that Dppa3 maintains imprinting by antagonizing Dnmt3a binding. Our results further show molecular parallels between Dppa3 and Vc in Dlk1-Dio3 imprinting maintenance and suggest that early activation of Dppa3 is one of the cascades through which Vc facilitates the generation of fully reprogrammed iPSCs.
The putative Na+/Cl−-dependent neurotransmitter/osmolyte transporter inebriated in the Drosophila hindgut is essential for the maintenance of systemic water homeostasis
Authors: Luan Zhuo , Quigley Caitlin , Li Hong-Sheng
Published: January 2015

Most organisms are able to maintain systemic water homeostasis over a wide range of external or dietary osmolarities. The excretory system, composed of the kidneys in mammals and the Malpighian tubules and hindgut in insects, can increase water conservation and absorption to maintain systemic water homeostasis, which enables organisms to tolerate external hypertonicity or desiccation. However, the mechanisms underlying the maintenance of systemic water homeostasis by the excretory system have not been fully characterized. In the present study, we found that the putative Na+/Cl−-dependent neurotransmitter/osmolyte transporter inebriated (ine) is expressed in the basolateral membrane of anterior hindgut epithelial cells. This was confirmed by comparison with a known basolateral localized protein, the α subunit of Na+-K+ ATPase (ATPα). Under external hypertonicity, loss of ine in the hindgut epithelium results in severe dehydration without damage to the hindgut epithelial cells, implicating a physiological failure of water conservation/absorption. We also found that hindgut expression of ine is required for water conservation under desiccating conditions. Importantly, specific expression of ine in the hindgut epithelium can completely restore disrupted systemic water homeostasis in ine mutants under both conditions. Therefore, ine in the Drosophila hindgut is essential for the maintenance of systemic water homeostasis.
A novel nonenzymatic glucose sensor based on magnetic copper ferrite immobilized on multiwalled carbon nanotubes
Authors: Zhang Yanwu , Zhou Echeng , Li Yijun , He Xiwen
Published: January 2015

A novel nonenzymatic glucose sensor was constructed based on the magnetic loading of CuFe2O4–MWCNTs composites without using an additive polymer binder.
A stop-flow two-dimensional liquid chromatography method for determination of food additives in yogurt
Authors: Hou Xiaofang , Ma Jing , He Xiaoshuang , Chen Liang , Wang Sicen , He Langchong
Published: January 2015

A heart-cutting, two-dimensional (2D) high performance liquid chromatography method was developed in this research to simultaneously quantify five food additives (aspartame, benzoic acid, natamycin, saccharin sodium and sorbic acid) in yogurt drinks.
Fluorescent G-quadruplex–NMM DNA probe for the detection of silver nanoparticles in aqueous media
Authors: Xu Shengmin , Zhang Yajun , Luo Xun , Wang Yichen , Chen Shaopeng , Wang Jun , Yuan Hang , Xu An , Wu Lijun
Published: January 2015

G-DNA–NMM fluorescent probe for the detection of silver nanoparticles.
A sensitive chemiluminescence enzyme immunoassay for the determination of deoxynivalenol in wheat samples
Authors: Zhang Rongsheng , Zhou Yujun , Zhou Mingguo
Published: January 2015

A sensitive chemiluminescence enzyme immunoassay (CLEIA) was developed and applied for the determination of deoxynivalenol residue in wheat samples.
Enzymatic cleavage of uracil-containing single-stranded DNA linkers for the efficient release of affinity-selected circulating tumor cells
Authors: Nair Soumya V. , Witek Małgorzata A. , Jackson Joshua M. , Lindell Maria A. M. , Hunsucker Sally A. , Sapp Travis , Perry Caroline E. , Hupert Mateusz L. , Bae-Jump Victoria , Gehrig Paola A. , Wysham Weiya Z. , Armistead Paul M. , Voorhees Peter , Soper Steven A.
Published: January 2015

We report rapid enzymatic release of affinity-selected cells with 90% efficiency and cells viability of 85%.
Regioselective C–H bond amination by aminoiodanes
Authors: Kantak Abhishek A. , Marchetti Louis , DeBoef Brenton
Published: January 2015

A new approach for the direct amination of 2-phenylpyridine derivatives using a diphthalimide-iodane and copper triflate has been developed. A series of different 2-phenylpyridine derivatives were aminated with yields up to 88%. Mechanistic investigations indicate that the reaction proceeds via a copper-mediated single electron transfer.
Nickel-catalyzed and benzoic acid-promoted direct sulfenylation of unactivated arenes
Authors: Yang Ke , Wang Yuqi , Chen Xinyong , Kadi Adnan A. , Fun Hoong-Kun , Sun Hao , Zhang Yan , Lu Hongjian
Published: January 2015

A nickel-catalyzed direct sulfenylation of unactivated arenes using removable 2-(pyridine-2-yl)-isopropylamine as a directing group has been developed.
Nonlinear absorption, nonlinear scattering, and optical limiting properties of MoS2–ZnO composite-based organic glasses
Authors: Qu Bin , Ouyang Qiuyun , Yu Xianbo , Luo Wenhe , Qi Lihong , Chen Yujin
Published: January 2015

ZnO nanoparticles with a size in 4.5 nm were grown on the surface of MoS2 nanosheets, showing superior nonlinear absorption properties compared to bare MoS2 nanosheets.
Facile synthesis and enhanced microwave absorption properties of novel hierarchical heterostructures based on a Ni microsphere–CuO nano-rice core–shell composite
Authors: Zhao Biao , Shao Gang , Fan Bingbing , Zhao Wanyu , Zhang Rui
Published: January 2015

The microwave absorption properties of a core–shell rice-like CuO-coated Ni composite are superior to those of pure Ni microspheres and CuO nanoflakes. The optimal reflection loss is −62.2 dB at 13.8 GHz.
DNA mediated assembly of quantum dot–protoporphyrin IX FRET probes and the effect of FRET efficiency on ROS generation
Authors: Singh Seema , Chakraborty Anirban , Singh Vandana , Molla Aniruddha , Hussain Sahid , Singh Manoj K. , Das Prolay
Published: January 2015

Quantum dot-protoporphyrin IX FRET probes are assembled through DNA hybridization and the efficiency of FRET and ROS generation was studied.
Ultrafast electron dynamics at water covered alkali adatoms adsorbed on Cu(111)
Authors: Meyer Michael , Agarwal Ishita , Wolf Martin , Bovensiepen Uwe
Published: January 2015

Here we report on the ultrafast electron dynamics of the alkalis Na, K, and Cs coadsorbed with D2O on Cu(111) surfaces, which we investigated with femtosecond time-resolved two-photon photoemission.
Fabrication of highly oriented large-scale TIPS pentacene crystals and transistors by the Marangoni effect-controlled growth method
Authors: Zhao Haoyan , Wang Zhao , Dong Guifang , Duan Lian
Published: January 2015

A new solution method of Marangoni effect-controlled oriented growth (MOG) to fabricate highly oriented crystals of TIPS pentacene.
A femtosecond mid-infrared study of the dynamics of water in aqueous sugar solutions
Authors: Groot C. C. M. , Bakker H. J.
Published: January 2015

The influence of sugars on the dynamics of water is relatively long-ranged and involves collective structural effects.
A QCT study of the role of the symmetric and antisymmetric stretch mode excitations of methane in the O(3P) + CH4 (νi = 0, 1; i = 1, 3) reaction
Authors: Espinosa-Garcia J. , Rangel C. , Garcia-Bernaldez J. C.
Published: January 2015

The CH stretching mode vibrational excitation opens up the reactive cone of acceptance, shifting the scattering angle from backward to sideways.
Conformational dynamics of carbohydrates: Raman optical activity of d-glucuronic acid and N-acetyl-d-glucosamine using a combined molecular dynamics and quantum chemical approach
Authors: Mutter Shaun T. , Zielinski François , Cheeseman James R. , Johannessen Christian , Popelier Paul L. A. , Blanch Ewan W.
Published: January 2015

Raman optical activity combined with state-of-the-art computational approaches successfully probes the conformational space of two important carbohydrates.
Au@Ag core–shell nanocubes: epitaxial growth synthesis and surface-enhanced Raman scattering performance
Authors: Liu Yanting , Zhou Jun , Wang Binbing , Jiang Tao , Ho Ho-Pui , Petti Lucia , Mormile Pasquale
Published: January 2015

Au@Ag core–shell nanocubes (NCs) with distinctive SERS performance were synthesized through controlled epitaxial growth strategy.
New insight into the structure of thiolated gold clusters: a structural prediction of the Au187(SR)68 cluster
Authors: Tlahuice-Flores A.
Published: January 2015

Marks decahedron constitutes the core of the thiolated Au187 cluster.
Long-lived nuclear spin states far from magnetic equivalence
Authors: Stevanato Gabriele , Singha Roy Soumya , Hill-Cousins Joe , Kuprov Ilya , Brown Lynda J. , Brown Richard C. D. , Pileio Giuseppe , Levitt Malcolm H.
Published: January 2015

Long-lived states exist far from magnetic equivalence when the local geometry is centrosymmetric.
Synthesis, characterization and optical properties of ligand-protected indium nanoparticles
Authors: George Anu , Choudhary Harish K. , Satpati Biswarup , Mandal Sukhendu
Published: January 2015

Small ligand-protected indium nanoparticles exhibit reverse plasmonics behavior in the ultraviolet region.
Developing functionalized Fe3O4–Au nanoparticles: a physico-chemical insight
Authors: Luchini Alessandra , Vitiello Giuseppe , Rossi Francesca , Ruiz De Ballesteros Odda , Radulescu Aurel , D’Errico Gerardino , Montesarchio Daniela , de Julián Fernández César , Paduano Luigi
Published: January 2015

Structural characterization and synthetic difficulties behind the obtainment of iron oxide-gold nanoparticles for biomedical applications.
Polyesters derived from itaconic acid for the properties and bio-based content enhancement of soybean oil-based thermosets
Authors: Dai Jinyue , Ma Songqi , Wu Yonggang , Han Lijing , Zhang Lisheng , Zhu Jin , Liu Xiaoqing
Published: January 2015

A series of fully bio-based polyesters were synthesized and they served as petroleum-based compound substitutions to copolymerize with a soybean oil derivative, leading to higher performance and higher percentages of bio-based constituents.
Dissolved cerium contributes to uptake of Ce in the presence of differently sized CeO2-nanoparticles by three crop plants
Authors: Schwabe Franziska , Tanner Simon , Schulin Rainer , Rotzetter Aline , Stark Wendelin , von Quadt Albrecht , Nowack Bernd
Published: January 2015

Cerium uptake into plants in the presence of CeO2 nanoparticles occurs not only in nanoparticulate form, but also as dissolved ions.
Synthesis and conformational studies of α/β2,3-peptides derived from alternating β2,3-amino acids andl-Ala repeats
Authors: Sharma Gangavaram V. M. , Sridhar Tailor , Veena Bacchu , Purushotham Reddy Pothula , Reddy Sheri Venkata , Bruneau Christian , Kunwar Ajit C.
Published: January 2015

A new class of α/β2,3-peptides were synthesized from C-linked carbo-β2,3-amino acids (β2,3-Caas) and investigated to understand the impact of the side chains (allyl/propargyl) at the Cα-position on their conformations.
A high-performance supercapacitor of vertically-oriented few-layered graphene with high-density defects
Authors: Qi Jun Lei , Wang Xu , Lin Jing Huang , Zhang Fu , Feng Ji Cai , Fei Wei-Dong
Published: January 2015

A correlation exists between the degree of defects, wettability and supercapacitor properties of VFG grown by PECVD.
Well-defined two dimensional covalent organic polymers: rational design, controlled syntheses, and potential applications
Authors: Xiang Zhonghua , Cao Dapeng , Dai Liming
Published: January 2015

Recent developments in the design, synthesis and application of 2D covalent organic polymers are reviewed, along with some perspectives and challenges.
Syntheses, structures, topologies, and luminescence properties of four coordination polymers based on bifunctional 6-(4-pyridyl)-terephthalic acid and bis(imidazole) bridging linkers
Authors: Fan Liming , Fan Weiliu , Li Bin , Liu Xinzheng , Zhao Xian , Zhang Xiutang
Published: January 2015

Four CPs, with the structure ranged from 2D sheet to 3D 3-fold penetrated net, have been designed with the mixed-ligand strategy of bifunctional 6-(4-pyridyl)-terephthalic acid and bis(imidazole) bridging linkers.
Fluorinated amphiphilic block copolymers via RAFT polymerization and their application as surf-RAFT agent in miniemulsion polymerization
Authors: Koiry Bishnu P. , Chakrabarty Arindam , Singha Nikhil K.
Published: January 2015

Preparation of an amphiphilic block copolymer (Am-BCP) based on poly(ethylene glycol) methyl ether methacrylate (PEGMA) and heptafluorobutyl acrylate (HFBA) via RAFT polymerization and application of this Am-BCP as surf-RAFT agent for polymerization of styrene.
Tailoring the impact behavior of polyamide 6 ternary blends via a hierarchical core–shell structure in situ formed in melt mixing
Authors: Dou Rui , Shen Chao , Yin Bo , Yang Ming-bo , Xie Bang-hu
Published: January 2015

The hierarchical core–shell structure in PA6/HDPE-g-MA/EPDM ternary blend was firstly formed using simple melt mixing. A super toughness PA6 ternary blends with HDPE-g-MA multi-core structure was obtained.
Interaction of bio-relevant thio-ether and thiols with dinuclear Pd(ii) complex: kinetics, mechanism, bioactivity in aqueous medium and molecular docking
Authors: Misra Koyel , Ghosh Goutam Kr , Mitra Ishani , Mukherjee Subhajit , Reddy B. Venkata P. , Linert Wolfgang , Misini Bashkim , Bose K Jagadeesh C. , Mukhopadhyay Sudit , Moi Sankar Ch
Published: January 2015

Third order kinetics of bio-relevant thiols and thio-ether with dinuclear Pd(ii) complex possessing anticancer and antibacterial properties.
Organophosphorus chemical warfare agent simulant DMMP promotes structural reinforcement of urea-based chiral supramolecular gels
Authors: Piana Francesca , Facciotti Marco , Pileio Giuseppe , Hiscock Jennifer R. , Van Rossom Wim , Brown Richard C. D. , Gale Philip A.
Published: January 2015

The addition of a certain amount of organophosphorus chemical warfare agent simulant DMMP promotes strengthening of the urea-based supramolecular gel structure.
Improving the bias range for spin-filtering by selecting proper electrode materials
Authors: Deng X. Q. , Zhang Z. H. , Yang C. H.
Published: January 2015

Using the non-equilibrium Green’s function method combined with density function theory, we investigate the spin transport for carbon chains connected to electrodes of different materials.
A photochromic nano-system via self-recovery for stable photocatalytic hydrogen evolution by optimizing TiO2 surface energy
Authors: Jiang Jinghui , Tong Liping , Zhou Han , Zhang Fan , Ding Jian , Zhang Di , Fan Tongxiang
Published: January 2015

AgBr photochromic self-recovery system was introduced into TiO2 to repeatedly optimize its surface energy by the repeating Br2 adsorption.
Novel environmentally sustainable cardanol-based plasticizer covalently bound to PVC via click chemistry: synthesis and properties
Authors: Yang Po , Yan Jun , Sun Huazhen , Fan Haojun , Chen Yi , Wang Fang , Shi Bi
Published: January 2015

Cardanol, a famous renewable organic resource of the cashew industry, was covalently linked to PVC chains as a natural internal plasticizer using the click reaction. The modified PVC exhibited decreased Tg and near-zero migration.
Purification, organophilicity and transparent fluorescent bulk material fabrication derived from hydrophilic carbon dots
Authors: Chen Xiangyang , Zhang Zhijun , Zhao Jingtai
Published: January 2015

High-efficiency oil/water interfacial self-assembly strategy has been used for the first time to purify hydrophilic CDs prepared by hydrothermal method.
Synthesis, structures, and electrochromic behaviors of poly(triarylamine)s based on 3-substituted thiophene derivatives
Authors: Lin Jinrui , Ni Xiuyuan
Published: January 2015

The sole difference in chemical structure plays a role in inflecting reactivity, probably through altering electron cloud density.
Gold nanoparticles supported on magnesium ferrite and magnesium oxide for the selective oxidation of benzyl alcohol
Authors: de Moura Edmilson M. , Garcia Marco A. S. , Gonçalves Renato V. , Kiyohara Pedro K. , Jardim Renato F. , Rossi Liane M.
Published: January 2015

The presence of K2CO3 significantly increased the catalytic activity and stability of Au NPs supported on magnesium oxide-based supports.
Asphalt-assisted assembly of breath figures: a robust templating strategy for general fabrication of ordered porous polymer films
Authors: Gong Jian-Liang , Xu Bin-Gang , Tao Xiao-Ming
Published: January 2015

A robust asphalt-assisted breath figure templating approach was explored for general fabrication of porous (hybrid) polymer films with ordered microstructures.
Use of deuterium labelling—evidence of graphene hydrogenation by reduction of graphite oxide using aluminium in sodium hydroxide
Authors: Jankovský Ondřej , Šimek Petr , Nováček Michal , Luxa Jan , Sedmidubský David , Pumera Martin , Macková Anna , Mikšová Romana , Sofer Zdeněk
Published: January 2015

Highly hydrogenated graphene is one of the main focuses in graphene research.
A new approach for the improved interpretation of capacitance measurements for materials utilised in energy storage
Authors: Kampouris Dimitrios K. , Ji Xiaobo , Randviir Edward P. , Banks Craig E.
Published: January 2015

A simple galvanostatic circuit method that can accurately measure the capacitance of an electrolytic capacitor is reported. The method avoids problems found in current EIS analysis, giving rise to profiles that result in inaccurate derivation of the electrolytic capacitance.
Self-promoted phthalimide-containing phthalonitrile resins with sluggish curing process and excellent thermal stability
Authors: Hu Jianghuai , Liu Yancui , Jiao Yan , Ji Suchun , Sun Rui , Yuan Ping , Zeng Ke , Pu Xuemei , Yang Gang
Published: January 2015

A novel unsymmetrical phthalimide-containing phthalonitrile was synthesized and showed excellent thermal properties. A nucleophilic addition mechanism was introduced to explain the different reactivities of active H-containing heterocyclic structures toward phthalonitrile.
Formation of bilayer clathrate hydrates
Authors: Zhao Wen-Hui , Bai Jaeil , Wang Lu , Yuan Lan-Feng , Yang Jinlong , Francisco Joseph S. , Zeng Xiao Cheng
Published: January 2015

A number of stable BL crystalline and amorphous gas hydrates with either hydrophobic or hydrophilic guest molecules can be formed within a nanoslit.
Correction: Biocompatible reduction-responsive polypeptide micelles as nanocarriers for enhanced chemotherapy efficacy in vitro
Authors: Ding Jianxun , Chen Jinjin , Li Di , Xiao Chunsheng , Zhang Jiancheng , He Chaoliang , Zhuang Xiuli , Chen Xuesi
Published: January 2015

Correction for ‘Biocompatible reduction-responsive polypeptide micelles as nanocarriers for enhanced chemotherapy efficacy in vitro’ by Jianxun Ding et al., J. Mater. Chem. B, 2013, 1, 69–81.
Self-organisation through size-exclusion in soft materials
Authors: Mandle Richard J. , Davis Edward J. , Voll Constantin-Christian A. , Lewis Daniel J. , Cowling Stephen J. , Goodby John W.
Published: January 2015

Can the interplay between steric and electronic properties induced by end-groups be used to dictate self-organisation in soft materials?
Correction: Identification of tris-(phenylalkyl)amines as new selective h5-HT2B receptor antagonists
Authors: Ponnala Shashikanth , Kapadia Nirav , Harding Wayne Wesley
Published: January 2015

Correction for ‘Identification of tris-(phenylalkyl)amines as new selective h5-HT2B receptor antagonists’ by Shashikanth Ponnala et al., Med. Chem. Commun., 2015, DOI: 10.1039/c4md00418c.
Dissecting structural and electronic effects in inducible nitric oxide synthase
Authors: Hannibal Luciana , Page Richard C. , Haque Mohammad Mahfuzul , Bolisetty Karthik , Yu Zhihao , Misra Saurav , Stuehr Dennis J.
Published: January 2015

Wild-type inducible NOS oxygenase and mutant W188H were substituted with the electron-rich analogue mesohaem. The absence of structural changes upon mesohaem replacement and the decrease in the enzyme's midpoint potential permitted the dissection of electronic and structural effects.
High‐resolution DOA estimation for closely spaced correlated signals using unitary sparse Bayesian learning
Authors: Lei Wenying , Chen Baixiao
Published: January 2015

A novel method is proposed to effectively solve the challenging problem of direction‐of‐arrival (DOA) estimation for closely spaced correlated signals. A centro‐Hermitian extended matrix is exploited to double the number of data samples, and then is transformed into a real‐valued data matrix. An improved sparse Bayesian learning scheme is utilised to estimate DOAs by recovering the real‐valued jointly row‐sparse solution matrix with a reduced computational burden. The proposed method not only provides increased estimation accuracy but also has improved angular separation performance. Simulation results validate the effectiveness of the proposed method.
Analogue‐to‐information conversion using multi‐comparator‐based integrate‐and‐fire sampler
Authors: Wen Fangqing , Tao Yu , Zhang Gong
Published: January 2015

A new methodology for sparse signal acquisition using a multi‐comparator‐based integrate‐and‐fire sampler is presented. By employing the randomness of comparator voltages, the original analogue signal is converted into a series of binaries and is guaranteed to be precisely recovered from these measurements. The proposed scheme operates with a sub‐Nyquist rate, which requires neither a high‐speed linear feedback shift register nor an accurate analogue‐to‐digital converter. The experimental results demonstrate the effectiveness of the proposed scheme.
Cluster‐error correction for through‐silicon vias in 3D ICs
Authors: Huang Tsung‐Chu
Published: January 2015

The two‐dimensional parity check is the optimum single‐error‐correction code in terms of speed. In this reported work it is employed to develop two sliding schemes for through‐silicon‐via cluster error correction in three‐dimensional ICs. For k bits of source data, the one‐dimensional sliding scheme can correct a single cluster error up to about √k bits and more extra discrete errors can be corrected by the two‐dimensional sliding scheme. Experiments show that for several hundreds of through‐silicon vias (TSVs), two trees of 3‐level 2‐input exclusive‐OR (XOR) gates are almost optimised to encode and decode each interconnect, and the time penalty can be controlled within about 1 ns.
Achieving negative security gaps with transmit antenna selection and frame scrambling in quasi‐static fading channels
Authors: Chiodi M.A. , Rebelatto J.L. , Souza R.D. , Brante G.
Published: January 2015

The security gap of a wireless network composed of two legitimate nodes and one eavesdropper, all provided with multiple antennas, is evaluated. The use of transmit antenna selection combined with frame scrambling may lead to gaps <0 dB, under feasible scrambling depths and a practical number of transmit antennas is shown.
Enhancement in third‐order output intercept point of high‐power photodiodes by nonlinear voltage‐ and current‐dependent responsivities
Authors: Shin Dong‐Soo , Chang William S.C. , Yu Paul K.L.
Published: January 2015

High‐power and high‐linearity photodiodes (PDs) are of critical importance to achieve high‐efficiency analogue fibre links. A small‐signal analysis is utilised on the nonlinear responsivity of the modified uni‐travelling‐carrier PDs to understand the theoretical limitation on the third‐order output intercept point (OIP3) of the link. It is theoretically shown that a nonlinear responsivity depending on both the voltage and the current can give rise to an enhanced OIP3 at certain bias and current values.
SSB‐AM‐based detection of phase error in active phased array antenna for space application
Authors: Ryu Sang‐Burm , Kang Eun‐Su , Lee Hyeon‐Cheol , Yong Sang‐Soon , Lee Sang‐Kon , Lee Sang‐Gyu
Published: January 2015

A phase variation detection scheme based on a SSB‐AM detector for the active phased array antenna is introduced. Since the phases of arrayed elements for the active phased array antenna vary unavoidably with increase in the surrounding temperature, such shifts should be detected and compensated accordingly, for maintaining the accuracy of beam direction radiated from the phased array antenna. Simulation results show that the proposed scheme is quite feasible.
Unsupervised binary hashing method using locality preservation and quantisation error minimisation
Authors: Kim Jin‐Bum , Park Rae‐Hong
Published: January 2015

An unsupervised binary hashing (UBH) method is proposed. To preserve the local and Euclidean metric structures in the reduced feature space, it performs the dimensionality reduction (DR) by using the orthogonal locality‐preserving projection. In addition, it minimises the error between the generated binary hash codes and low‐dimensional feature vectors that are obtained in DR. To minimise the quantisation error, the binary hash codes are generated using the optimal rotation and offset. Experimental results show that the proposed UBH method has better performance than other existing methods in terms of the mean average precision and recall–precision curve.
Improved methods for Feynman path integral calculations and their application to calculate converged vibrational–rotational partition functions, free energies, enthalpies, entropies, and heat capacities for methane
Authors: Mielke Steven L. , Truhlar Donald G.
Published: January 2015

We present an improved version of our “path-by-path” enhanced same path extrapolation scheme for Feynman path integral (FPI) calculations that permits rapid convergence with discretization errors ranging from O(P−6) to O(P−12), where P is the number of path discretization points. We also present two extensions of our importance sampling and stratified sampling schemes for calculating vibrational–rotational partition functions by the FPI method. The first is the use of importance functions for dihedral angles between sets of generalized Jacobi coordinate vectors. The second is an extension of our stratification scheme to allow some strata to be defined based only on coordinate information while other strata are defined based on both the geometry and the energy of the centroid of the Feynman path. These enhanced methods are applied to calculate converged partition functions by FPI methods, and these results are compared to ones obtained earlier by vibrational configuration interaction (VCI) calculations, both calculations being for the Jordan–Gilbert potential energy surface. The earlier VCI calculations are found to agree well (within ∼1.5%) with the new benchmarks. The FPI partition functions presented here are estimated to be converged to within a 2σ statistical uncertainty of between 0.04% and 0.07% for the given potential energy surface for temperatures in the range 300–3000 K and are the most accurately converged partition functions for a given potential energy surface for any molecule with five or more atoms. We also tabulate free energies, enthalpies, entropies, and heat capacities.
Magneto-transport and thermoelectric properties of epitaxial FeSb2 thin film on MgO substrate
Authors: Duong Anh Tuan , Rhim S. H. , Shin Yooleemi , Nguyen Van Quang , Cho Sunglae
Published: January 2015

We report magneto-transport and thermoelectric properties of FeSb2 thin film epitaxially grown on the MgO substrate using molecular beam epitaxy. The film exhibits compressive strain of 1.74% owing to large lattice mismatch, whose physical consequences are nontrivial. Magnetic phase has been changed from diamagnetic in bulk, as evidenced by anomalous Hall effect (AHE) and negative magneto-resistance (MR). The FeSb2 film is semiconducting without any metallic transition unlike the bulk counterpart. In particular, hysteresis in MR with distinct feature of AHE is evident with coercive field of 500 and 110 Oe for T = 20 and 50 K, respectively. Furthermore, from the Seebeck coefficients and temperature dependence of the resistivity, it is evident that the film is semiconducting with small band gap: 3.76 meV for T < 40 K and 13.48 meV for T > 40 K, respectively, where maximum thermoelectric power factor of 12 μV/cm·K at T = 50 K.
Carrier mobility of highly transparent conductive Al-doped ZnO polycrystalline films deposited by radio-frequency, direct-current, and radio-frequency-superimposed direct-current magnetron sputtering: Grain boundary effect and scattering in the grain bulk
Authors: Nomoto Junichi , Makino Hisao , Yamamoto Tetsuya
Published: January 2015

The effects of using radio-frequency (RF)-superimposed direct-current (DC) magnetron sputtering deposition on the structural, electrical, and optical properties of aluminum-doped ZnO (AZO)-based highly transparent conducting oxide films have been examined. AZO films were deposited on heated non-alkaline glass substrates (200 °C) using ZnO:Al2O3 (2 wt. % Al2O3) ceramic oxide targets with the total power varied from 150 to 300 W, and at various RF to DC power ratios, AZO films deposited by a mixed approach with the RF to the total power ratio of 0.14 showed the lowest resistivity of 2.47 × 10−4 Ω cm with the highest carrier concentration of 6.88 × 1020 cm−3 and the highest Hall mobility (μH) of 36.8 cm2/Vs together with the maximum value of an average transmittance in the visible spectral range from 400 to 700 nm. From the analysis of optical data based on the simple Drude model combined with the Tauc-Lorentz model and the results of Hall effect measurements, the optical mobility (μopt) was determined. A comparison of μopt with μH clarified the effects of the mixed approach not only on the reduction of the grain boundary contribution to the carrier transport but also on retaining high carrier mobility of in-grains for the AZO films.
A 2-categorical state sum model
Authors: Baratin Aristide , Freidel Laurent
Published: January 2015

It has long been argued that higher categories provide the proper algebraic structure underlying state sum invariants of 4-manifolds. This idea has been refined recently, by proposing to use 2-groups and their representations as specific examples of 2-categories. The challenge has been to make these proposals fully explicit. Here, we give a concrete realization of this program. Building upon our earlier work with Baez and Wise on the representation theory of 2-groups, we construct a four-dimensional state sum model based on a categorified version of the Euclidean group. We define and explicitly compute the simplex weights, which may be viewed a categorified analogue of Racah-Wigner 6j-symbols. These weights solve a hexagon equation that encodes the formal invariance of the state sum under the Pachner moves of the triangulation. This result unravels the combinatorial formulation of the Feynman amplitudes of quantum field theory on flat spacetime proposed in A. Baratin and L. Freidel [Classical Quantum Gravity 24, 2027–2060 (2007)] which was shown to lead after gauge-fixing to Korepanov’s invariant of 4-manifolds.
On the influence of tetrahedral covalent-hybridization on electronic band structure of topological insulators from first principles
Authors: Zhang X. M. , Xu G. Z. , Liu E. K. , Liu Z. Y. , Wang W. H. , Wu G. H.
Published: January 2015

Based on first-principles calculations, we investigate the influence of tetrahedral covalent-hybridization between main-group and transition-metal atoms on the topological band structures of binary HgTe and ternary half-Heusler compounds, respectively. Results show that, for the binary HgTe, when its zinc-blend structure is artificially changed to rock-salt one, the tetrahedral covalent-hybridization will be removed and correspondingly the topologically insulating band character lost. While for the ternary half-Heusler system, the strength of covalent-hybridization can be tuned by varying both chemical compositions and atomic arrangements, and the competition between tetrahedral and octahedral covalent-hybridization has been discussed in details. As a result, we found that a proper strength of tetrahedral covalent-hybridization is probably in favor to realizing the topologically insulating state with band inversion occurring at the Γ point of the Brillouin zone.
Metal-insulator transition in Nd1−xEuxNiO3: Entropy change and electronic delocalization
Authors: Jardim R. F. , Barbeta V. B. , Andrade S. , Escote M. T. , Cordero F. , Torikachvili M. S.
Published: January 2015

The metal-insulator (MI) phase transition in Nd1–xEuxNiO3, 0 ≤ x ≤ 0.35, has been investigated through the pressure dependence of the electrical resistivity ρ(P, T) and measurements of specific heat CP(T). The MI transition temperature (TMI) increases with increasing Eu substitution and decreases with increasing pressure. Two distinct regions for the Eu dependence of dTMI/dP were found: (i) for x ≤ 0.15, dTMI/dP is nearly constant and ∼−4.3 K/kbar; (ii) for x ≥ 0.15, dTMI/dP increases with x and it seems to reach a saturation value ∼−6.2 K/kbar for the x = 0.35 sample. This change is accompanied with a strong decrease in the thermal hysteresis in ρ(P, T) between the cooling and warming cycles, observed in the vicinity of TMI. The entropy change (ΔS) at TMI for the sample x = 0, estimated by using the dTMI/dP data and the Clausius-Clapeyron equation, resulted in ΔS ∼ 1.2 J/mol K, a value in line with specific heat measurements. When the Eu concentration is increased, the antiferromagnetic (AF) and the MI transitions are separated in temperature, permitting that an estimate of the entropy change due to the AF/Paramagnetic transition be carried out, yielding ΔSM ∼ 200 mJ/mol K. This value is much smaller than that expected for a s = 1/2 spin system. The analysis of ρ(P, T) and CP(T) data indicates that the entropy change at TMI is mainly due to the electronic delocalization and not related to the AF transition.
Magnetocaloric effect and magnetostructural coupling in Mn0.92Fe0.08CoGe compound
Authors: Wang J. L. , Shamba P. , Hutchison W. D. , Gu Q. F. , Md Din M. F. , Ren Q. Y. , Cheng Z. X. , Kennedy S. J. , Campbell S. J. , Dou S. X.
Published: January 2015

The structural properties of Mn0.92Fe0.08CoGe have been investigated in detail using synchrotron x-ray diffraction in zero and applied pressure (p = 0–10 GPa). A ferromagnetic transition occurs around TC = 300 K and a large magnetic-entropy change −ΔSM = 17.3 J/kg K detected at TC for a field change of ΔB = 5 T. The field dependence of −ΔSMmax can be expressed as −ΔSMmax ∝ B. At ambient temperature and pressure, Mn0.92Fe0.08CoGe exhibits a co-existence of the orthorhombic TiNiSi-type structure (space group Pnma) and hexagonal Ni2In-type structure (space group P63/mmc). Application of external pressure drives a structure change from the orthorhombic TiNiSi-type structure to the hexagonal Ni2In-type structure. A large anomaly in heat capacity around TC is detected and the Debye temperature θD (=319(±10) K) has been derived from analyses of the low temperature heat capacity, T ≲ 10 K.
High pressure study of B12As2: Electrical transport behavior and the role of grain boundaries
Authors: Wang Qinglin , Liu Cailong , Ma Boheng , Gao Yang , Fitzpatrick Matthew , Li Yuqiang , Liu Bao , Gao Chunxiao , Ma Yanzhang
Published: January 2015

Using a diamond anvil cell, the evolutions of alternate-current impedance spectra and direct- current resistivity in B12As2 have been investigated up to 51.9 GPa. The results provide evidence for the existence of grain and grain boundary effects that are separated in the frequency region. The grain boundary resistance shows a relatively smaller contribution to the total resistance above 16.8 GPa. By using the double-Schottky barrier model, the space charge potential was obtained. A pressure-induced inversion of charge defect concentration in the space charge layer was found at 20.7 GPa. The high-temperature resistivity measurements indicate that the transport activation energy is determined by defect energy levels in the band gap.
A polarized bifocal switch based on liquid crystals operated electrically and optically
Authors: Chen Hung-Shan , Lin Yi-Hsin , Chang Chia-Ming , Wang Yu-Jen , Srivastava Abhishek Kumar , Sun Jia Tong , Chigrinov Vladimir Grigorievich
Published: January 2015

A polarized bifocal switch based on liquid crystals (LC) operated electrically and optically is demonstrated. The bifocal switch mainly consists of two parts: a LC layer as a polarization switch and two polymeric layers for modulation of polarization dependent spatial phase difference which results in a positive or a negative lensing effect. The orientations of the LC molecules in the polarization switch are manipulated either in electrically switching (ES) mode or optically rewritten (ORW) mode. The bifocal switch with an aperture size of 10 mm exhibits two discrete lens powers (−1.39 Diopter and +0.7 Diopter) with different polarization states no matter in ES mode or in ORW mode. ORW mode is also a bistable mode. The related mechanism and electro-optical performance are discussed and demonstrated. Such a versatile optical switch is capable of not only switching between a positive lens power and a negative lens power, but also switching between two linear polarization states which can be useful in optical systems. The potential applications are for optical systems, wearable devices and ophthalmic lenses.
The effect of symmetry on resonant and nonresonant photoresponses in a field-effect terahertz detector
Authors: Sun J. D. , Qin H. , Lewis R. A. , Yang X. X. , Sun Y. F. , Zhang Z. P. , Li X. X. , Zhang X. Y. , Cai Y. , Wu D. M. , Zhang B. S.
Published: January 2015

The effect of the symmetries in the terahertz (THz) field distribution and the field-effect channel on THz photoresponse is examined. Resonant excitation of cavity plasmon modes and nonresonant self-mixing of THz waves are demonstrated in a GaN/AlGaN two-dimensional electron gas with symmetrically designed nanogates, antennas, and filters. We found that the self-mixing signal can be effectively suppressed by the symmetric design and the resonant response benefits from the residual asymmetry. The findings suggest that a single detector may provide both high sensitivity from the self-mixing mechanism and spectral resolution from the resonant response by optimizing the degree of geometrical and/or electronic symmetries.
Dynamic correlation between the flow units of supercooled metallic liquid
Authors: Zhang M. , Li N. , Liu L.
Published: January 2015

In contrast to the nano-sized shear bands in metallic glasses at room temperature, a millimeter-sized shear band is observed in the flow of supercooled metallic liquid. To understand the precipitation of the observed millimeter-sized shear band, an empirical approach to characterize the dynamic correlation between the flow units is proposed based on the transient mechanical response in the flow of supercooled metallic liquid. The characterized dynamic correlation well reproduces the staged-feature of the Van Hove's self-correlation function and explains the precipitation of shear band. Besides, for the dominant dynamic correlation approaching the glass transition temperature Tg, glass transition is suggested to be more than frozen.
Multi-electrode Pb(Zr,TiO)3/Ni cylindrical layered magnetoelectric composite
Authors: Xu L. R. , Pan D. A. , Zuo Z. J. , Wang J. , Volinsky A. A. , Qiao L. J.
Published: January 2015

Multi-electrode Pb(Zr,TiO)3/Ni cylindrical layered magnetoelectric (ME) composites were made by electroplating. The electroplated Ni layers were arrayed as four arcs on the inner PZT cylinder surface. The axial ME voltage coefficient of the composites was studied. Due to the cylinder symmetry, each of the four units of the PZT/Ni cylinder showed the same ME voltage response as the whole cylindrical ME composite, or when connected in parallel. When the four units were connected in series, the ME voltage was improved about three times than the single unit. This optimization is promising for the miniaturized ME devices design.
Graphene-graphene oxide-graphene hybrid nanopapers with superior mechanical, gas barrier and electrical properties
Authors: Ouyang Xilian , Huang Wenyi , Cabrera Eusebio , Castro Jose , Lee L. James
Published: January 2015

Hybrid nanopaper-like thin films with a graphene oxide (GO) layer sandwiched by two functionalized graphene (GP-SO3H) layers were successfully prepared from oxidized graphene and benzene sulfonic modified graphene. The hybrid graphene-graphene oxide-graphene (GP-GO-GP) nanopapers showed combination of high mechanic strength and good electrical conductivity, leading to desirable electromagnetic interference shielding performance, from the GP-SO3H layers, and superior gas diffusion barrier provided by the GO layer. These GP-GO-GP nanopapers can be readily coated onto plastic and composite substrates by thermal lamination and injection molding for various industrial applications such as fuel cell and natural gas containers.
A Unified Bootstrap Test for Local Patterns of Spatiotemporal Association
Authors: Yan N a , Mei Chang-Lin , Wang Ning
Published: January 2015

There has been a growing interest in using local statistics to identify spatial or spatiotemporal association patterns among georeferenced data, in which the null distributions of the statistics play a key role for the confirmatory inferences. In this study we focus on a generic form of local spatiotemporal statistics and propose a unified bootstrap approach to derive the null distribution of the statistic. In particular, the spatiotemporal variants of the commonly used local spatial statistics Moran's Ii, Geary's ci, and Getis and Ord's Gi are studied in detail. Some simulations are conducted to evaluate the validity of the bootstrap method in approximating the null distributions of the three spatiotemporal statistics. Meanwhile, the bootstrap method is compared with the permutation approach in terms of approximation accuracy and computation efficiency. The results show that both the bootstrap and the permutation methods can accurately approximate the null distributions of the statistics for various spatiotemporal topological relationships while the bootstrap method seems to be more efficient than the permutation approach. Additionally, the power of the spatiotemporal version of Moran's Ii in detecting spatiotemporal autocorrelation is empirically assessed and a real-world example is given to demonstrate the application of the bootstrap inference method.
The Power of (Re)Attachment in Urban Strategy: Interrogating the Framing of Social Sustainability in Malmö
Authors: Gressgård Randi
Published: January 2015

Based on a critical examination of Malmö's new development strategy, this paper discusses the power of attachment in urban strategy, with a special focus on the ideological framing of social sustainability. It argues that the social sustainability agenda has less to do with its practical purpose of equalizing living conditions in a segregated city and more to do with its ability to mobilize people under a future vision through attachment to a fantasmatic narrative. The fantasmatic construction of the ‘future city’ helps promote ideological closure, but the fantasmatic vision is not tantamount to a utopian ideal that transcends participants' self-interests. The paper analyzes urban strategists' communication of visionary planning ideas, such as the idea of social sustainability, as a ritual practice that generates an abstract uniformity through people's consensual appropriation of schemes. At the same time, the appropriation of schemes affords the participants a space of resistance which could turn the power of attachment into a politics of reattachment that critically engages with—and politicizes—ideological constructs that relate everything to a single vision.