bluuebunny/crossref_metadata_2025 huggingface dataset:
Anion–π interactions in lithium–organic redox flow batteries
Authors: Li Lei , Hong Yu-Jian , Chen Dong-Yang , Xiao Wang-Chuan , Lin Mei-Jin
Published: January 2019

The interactions between the electrolyte anions and electron-deficient redox-active organic molecules (anion–π interactions) have strong influences on the battery properties due to the anion–π-induced formation of radical anions or sandwich-like aggregates.
Homogenous deposition of matrix–analyte cocrystals on gold-nanobowl arrays for improving MALDI-MS signal reproducibility
Authors: Li Weiwei , Khan Mashooq , Li Haifang , Lin Ling , Mao Sifeng , Lin Jin-Ming
Published: January 2019

An Au-nanobowl array was synthesized to utilize its excellent properties to achieve efficient quantitative analysis via MALDI-MS analysis.
Concentrated-acid triggered superfast generation of porous amorphous cobalt oxide toward efficient water oxidation catalysis in alkaline solution
Authors: Ji Xuqiang , He Yujia , Liu Jingquan
Published: January 2019

Amorphous cobalt oxide on carbon cloth (AMO-CoO/CC) was prepared as an excellent water-oxidation catalyst with 50 mV less overpotential at 10 mA cm−2 than highly-crystallized Co3O4 in 1.0 M KOH.
Substituted Hantzsch esters as radical reservoirs with the insertion of sulfur dioxide under photoredox catalysis
Authors: Wang Xuefeng , Li Haozhe , Qiu Guanyinsheng , Wu Jie
Published: January 2019

A three-component reaction between 4-substituted Hantzsch esters, DABCO·(SO2)2, and vinyl azides in the presence of photoredox catalysts under visible light irradiation is developed. A range of (Z)-2-(alkylsulfonyl)-1-arylethen-1-amines is obtained in moderate to good yields with good regioselectivity and stereoselectivity.
New insights into chalcogen bonding provided by co-crystal structures of benzisoselenazolinone derivatives and nitrogen bases
Authors: Fellowes Thomas , White Jonathan M.
Published: January 2019

A number of derivatives of benzisoselenazolinones, including the drug ebselen, have been synthesized, and their interactions with various nitrogen bases characterized through X-ray crystallography.
Polymorphism in p-aminobenzoic acid
Authors: Cruz-Cabeza Aurora J. , Davey Roger J. , Oswald Iain D. H. , Ward Martin R. , Sugden Isaac J.
Published: January 2019

We review the polymorphism of p-aminobenzoic acid (pABA), a model drug compound whose crystallisation and polymorphic behaviour has been extensively studied in recent years.
Synthesis and structural characterization of transition metal dithiolene derivatives containing divalent metals as counter-cations
Authors: Castillo Oscar , Delgado Esther , Hernández Diego , Hernández Elisa , Martín Avelino , Zamora Félix
Published: January 2019

Complexes containing [Fe2(SC6H2Cl2S)4]2− or [Ni(SC6H2Cl2S)2]− entities and divalent metal cations as well as an 1D-coordination polymer K/Zn have been obtained and their magnetic behaviour studied.
Designed synthesis of Co-doped sponge-like In2O3 for highly sensitive detection of acetone gas
Authors: Zhang Xiaole , Song Dalei , Liu Qi , Chen Rongrong , Liu Jingyuan , Zhang Hongsen , Yu Jing , Liu Peili , Wang Jun
Published: January 2019

Materials based on Co-doped sponge-like In2O3 with high sensing properties were fabricated for easier detection of acetone gas.
Catalytic dissociation of tris(dimethylamino)silane on hot tungsten and tantalum filament surfaces
Authors: Owusu-Ansah Ebenezer , Rajendran Arun , Shi Yujun
Published: January 2019

Tris(dimethylamino)silane catalytically dissociates on W and Ta surfaces to form ˙CH3 and H3C–NCH2, favored at low and high temperatures, respectively.
Disulfide bond photochemistry: the effects of higher excited states and different molecular geometries on disulfide bond cleavage
Authors: Cao Jun , Chen Dong-Chu
Published: January 2019

We have investigated the light-induced cleavage of disulfide bond using MS-CASPT2 based trajectory simulations and provided insights into the intrinsic excited state properties of disulfide molecules.
A tool box to ascertain the nature of doping and photoresponse in single-walled carbon nanotubes
Authors: Santidrián Ana , González-Domínguez José M. , Diez-Cabanes Valentin , Hernández-Ferrer Javier , Maser Wolfgang K. , Benito Ana M. , Anśon-Casaos Alejandro , Cornil Jérôme , Da Ros Tatiana , Kalbáč Martin
Published: January 2019

The effect of doping on the electronic properties in bulk single-walled carbon nanotube (SWCNT) samples is studied for the first time using a new in situ Raman spectroelectrochemical method, and further verified by DFT calculations and photoresponse.
Parahydrogen-induced polarization with a metal-free P–P biradicaloid
Authors: Zhivonitko Vladimir V. , Bresien Jonas , Schulz Axel , Koptyug Igor V.
Published: January 2019

The activation of parahydrogen by a metal-free P–P biradicaloid leads to1H and31P nuclear spin hyperpolarization.
Thermal stability of p-type Ag-doped Mg3Sb2 thermoelectric materials investigated by powder X-ray diffraction
Authors: Song Lirong , Zhang Jiawei , Iversen Bo Brummerstedt
Published: January 2019

For both Mg2.985Ag0.015Sb2 bulk and powdered samples, an Sb phase appears above ∼500 K but it stabilizes during subsequent thermal cycling.
A new NMR crystallographic approach to reveal the calcium local structure of atorvastatin calcium
Authors: Holmes Sean T. , Wang Wei D. , Hou Guangjin , Dybowski Cecil , Wang Wei , Bai Shi
Published: January 2019

We combine experimental and computational determination of 43Ca solid-state NMR parameters (chemical shift tensors, quadrupolar coupling tensors, and Euler angles) to constrain the structure of the local calcium–ligand coordination environment.
Photocatalytic CO2reduction by H2O: insights from modeling electronically relaxed mechanisms
Authors: Poudyal Samiksha , Laursen Siris
Published: January 2019

Understanding of the ground-state surface reaction mechanism for photocatalytic CO2reduction and new connections between catalyst surface reactivity and experimentally observed activity and selectivity are presented to facilitate the development of catalysts that exhibit improved activity, controlled product distributions, and enhanced quantum yield.
A robust Ti(iv)-based mesogen constructed around a TiO4N2 core
Authors: Barloy L. , Heinrich B. , Douce L. , Henry M. , Scarpi-Luttenauer M. , Kyritsakas N. , Mobian P.
Published: January 2019

A Ti(iv)-complex with thermotropic liquid crystal properties is reported.
A study on the dependence of bacteria adhesion on the polymer nanofibre diameter
Authors: De Cesare Fabrizio , Di Mattia Elena , Zussman Eyal , Macagnano Antonella
Published: January 2019

Analysing the dependence of bacteria adhesion on the diameter of nanofibres to improve cell-to-material adhesion for target applications.
Can we use on-the-fly quantum simulations to connect molecular structure and sunscreen action?
Authors: Richings Gareth W. , Robertson Christopher , Habershon Scott
Published: January 2019

Direct MCTDH quantum dynamics simulations, with automatic active coordinate generation, applied to potential molecular sunscreens.
In situ preparation of a Nb–Pb codoped and Pd loaded TiO2 photocatalyst from waste multi-layer ceramic capacitors by a chlorination–leaching process
Authors: Niu Bo , Xu Zhenming
Published: January 2019

We in situ prepared a Nb–Pb codoped and Pd loaded TiO2 photocatalyst from waste MLCCs, which realized waste utilization, low-cost preparation and environmental protection.
Mild palladium-catalysed highly efficient hydrogenation of CN, C–NO2, and CO bonds using H2 of 1 atm in H2O
Authors: Liu Yaxu , He Shaopo , Quan Ziyi , Cai Huizhuo , Zhao Yang , Wang Bo
Published: January 2019

Here we present the first example of a mild and high-efficiency protocol enabling a process in water using 1 atm of H2 for the efficient and selective hydrogenation of nitriles, nitro compounds, ketones, and aldehydes to yield primary amines and alcohols with satisfactory yields of up to >99%.
Engineering human islet organoids from iPSCs using an organ-on-chip platform
Authors: Tao Tingting , Wang Yaqing , Chen Wenwen , Li Zhongyu , Su Wentao , Guo Yaqiong , Deng Pengwei , Qin Jianhua
Published: January 2019

This work presents a new strategy to engineer functional human islet organoids from iPSCs in a perfusable organ-on-a-chip device.
Design and gelation behaviors of cholesterol-based derivatives as organogelators: an investigation of the correlation between molecular structures and gelation behaviors
Authors: Yang Hai-Kuan , Wang Xiao-Min , Liu Ling-Ling , Shi Han-Xu
Published: January 2019

The carboxylic group and the number of cholesteryl moieties have an important influence on gelation behaviors.
A new strategy to synthesize three-coordinate mononuclear copper(i) halide complexes containing a bulky terphenyl bidentate phosphine ligand and their luminescent properties
Authors: Liu Li-Ping , Zhang Rui , Liu Li , Zhong Xin-Xin , Li Fa-Bao , Wang Lei , Wong Wai-Yeung , Li Guang-Hua , Cong Heng-Jiang , Alharbi Njud S. , Zhao Yi
Published: January 2019

Three mononuclear three-coordinate Cu(i) halide complexes were synthesized by a new strategy and they exhibit green to yellow green emission in the solid state at room temperature.
ESIPT-based fluorescence probe for the ratiometric detection of superoxide
Authors: Wu Luling , Liu Liyuan , Han Hai-Hao , Tian Xue , Odyniec Maria L. , Feng Lei , Sedgwick Adam C. , He Xiao-Peng , Bull Steven D. , James Tony D.
Published: January 2019

A simple ESIPT-based fluorescence probe (HMBT-LW) was developed for the detection of superoxide (O2˙−).
Chiral chromane[4]arenes synthesised by cycloaddition reactions ofo-quinomethine resorcin[4]arenes
Authors: Stefańska Karolina , Szafraniec Anna , Szymański Marek P. , Wierzbicki Michał , Szumna Agnieszka , Iwanek Waldemar
Published: January 2019

The synthesis of cavity-extended cyclochiral heterocyclic derivatives of chromane[4]arenes by a cycloaddition reaction between theo-quinomethine derivative of resorcin[4]arene and various styrenes is described.
Heteromultimetallic compounds based on polyfunctional carboxylate linkers
Authors: Jantan Khairil A. , McArdle James M. , Mognon Lorenzo , Fiorini Valentina , Wilkinson Luke A. , White Andrew J. P. , Stagni Stefano , Long Nicholas J. , Wilton-Ely James D. E. T.
Published: January 2019

Polyfunctional linkers bearing carboxylate, bipyridine and alkyne functionalities allow the stepwise construction of multimetallic assemblies incorporating redox and photophysical properties.
Photothermal transformation of Au–Ag nanocages under pulsed laser irradiation
Authors: Hood Zachary D. , Kubelick Kelsey P. , Gilroy Kyle D. , Vanderlaan Don , Yang Xuan , Yang Miaoxin , Chi Miaofang , Emelianov Stanislav Y. , Xia Younan
Published: January 2019

Pulsed laser irradiation can photothermally transform Au–Ag nanocages into pseudo-spherical, solid nanoparticles. The results may have implications for the future use of Au–Ag nanocages in biomedicine, catalysis, and sensing.
Mechanistic characterization of three sesquiterpene synthases from the termite-associated fungus Termitomyces
Authors: Burkhardt Immo , Kreuzenbeck Nina B. , Beemelmanns Christine , Dickschat Jeroen S.
Published: January 2019

Three terpene synthases from the termite associated fungus Termitomyces were studied by isotopic labelling experiments and site-directed mutagenesis.
Stereoselective synthesis of all-cis boryl tetrahydroquinolines via copper-catalyzed regioselective addition/cyclization of o-aldiminyl cinnamate with B2Pin2
Authors: Bi Ya-Ping , Wang He-Min , Qu Hong-Yu , Liang Xian-Chen , Zhou Ying , Li Xue-Ying , Xu Defeng , Shen Mei-Hua , Xu Hua-Dong
Published: January 2019

All-cis 2-aryl-3-carboxylate-4-boryl tetrahydroquinolines can be made exclusively via a copper-catalyzed carboboration of aryl acrylates with aldimines.
One-step synthesis and regioselective polymerization of Nα,Nδ-bisphenoxycarbonyl-l-ornithine
Authors: Li Zehua , Yang Zhening , Bai Tianwen , Ling Jun
Published: January 2019

Nα,Nδ-Bisphenoxycarbonyl-l-ornithine is synthesized by a one-step protection of l-ornithine, and it acts as a monomer for regioselective and controlled polymerization to yield poly(Nδ-phenoxycarbonyl-l-ornithine).
Effect of platinum electrode materials and electrolysis processes on the preparation of acidic electrolyzed oxidizing water and slightly acidic electrolyzed water
Authors: Song Xiang , Zhao Hui , Fang Keneng , Lou Yongshan , Liu Zongkui , Liu Chifeng , Ren Zhandong , Zhou Xiaorong , Fang Hua , Zhu Yuchan
Published: January 2019

The effects of platinum electrode materials and electrolysis processes on the preparation of AEOW and SAEW have been systematically studied.
Structure–property relationship of nitramino oxetane polymers: a computational study on the effect of pendant chains
Authors: Ma Yiding , Liu Yingzhe , Yu Tao , Lai Weipeng , Ge Zhongxue , Jiang Zhenyi
Published: January 2019

A comprehensive study of the effect of the structure of pendant chains on the energetic and mechanical properties of nitramino oxetane polymers has been conducted.
Synthesis, structures and properties of six lanthanide complexes based on a 2-(2-carboxyphenyl)imidazo(4,5-f)-(1,10)phenanthroline ligand
Authors: Ren Shanshan , Jiang Wei , Wang Qingwei , Li Zhimin , Qiao Yu , Che Guangbo
Published: January 2019

Six lanthanide complexes based on 2-HNCP possess good thermal stabilities, characteristic photoluminescence properties, and photocatalytic activities for organic dyes degradation under visible light irradiation.
The neutralization of heparan sulfate by heparin-binding copolymer as a potential therapeutic target
Authors: Kalaska Bartlomiej , Miklosz Joanna , Kamiński Kamil , Musielak Bogdan , Yusa Shin-Ichi , Pawlak Dariusz , Nowakowska Maria , Szczubiałka Krzysztof , Mogielnicki Andrzej
Published: January 2019

The neutralization of heparan sulfate (HS) by a heparin-binding copolymer (HBC) could be a promising treating option for bacterial or viral infections or bleeding related to overproduction of HS in cancer or other diseases.
Biochemical characterization and biocatalytic application of a novel d-tagatose 3-epimerase from Sinorhizobium sp.
Authors: Zhu Zhangliang , Li Chao , Liu Xin , Gao Dengke , Wang Xueyu , Tanokura Masaru , Qin Hui-Min , Lu Fuping
Published: January 2019

Sinorhizobium sp. d-tagatose 3-epimerase (sDTE) catalyzes the conversion of d-tagatose to d-sorbose.
Surface-attached sulfonamide containing quaternary ammonium antimicrobials for textiles and plastics
Authors: Caschera Alexander , Mistry Kamlesh B. , Bedard Joseph , Ronan Evan , Syed Moiz A. , Khan Aman U. , Lough Alan J. , Wolfaardt Gideon , Foucher Daniel A.
Published: January 2019

A series of surface attached silane or benzophenone sulfonamide quaternary ammonium antimicrobials show potent efficacy at solid/air and solid/liquid interfaces.
Durable liquid-crystalline vitrimer actuators
Authors: Chen Qiaomei , Li Yongsan , Yang Yang , Xu Yanshuang , Qian Xiaojie , Wei Yen , Ji Yan
Published: January 2019

A vitrimer-based LCE actuator subtly mitigates the conflict between processability and actuation durability by reducing the catalyst content.
Electrochemical reduction of CO2 by single atom catalyst TM–TCNQ monolayers
Authors: Liu Jin-Hang , Yang Li-Ming , Ganz Eric
Published: January 2019

Eight novel two-dimensional TM–TCNQ (TM = V–Zn) monolayers as highly efficient and selective electrocatalysts for CO2 reduction have been systematically studied and the underlying detailed reaction mechanisms have been revealed.
Recent advances in the use of carbon nanotubes as smart biomaterials
Authors: Menezes Beatriz Rossi Canuto de , Rodrigues Karla Faquine , Fonseca Beatriz Carvalho da Silva , Ribas Renata Guimarães , Montanheiro Thaís Larissa do Amaral , Thim Gilmar Patrocínio
Published: January 2019

Carbon nanotubes (CNTs) have outstanding properties that can be used to produce intelligent devices to detect pathogens, delivery drugs, and replace bone and dental parts. Therefore, CNTs have been extensively studied as medical devices.
Hyaluronic acid and polydopamine functionalized phase change nanoparticles for ultrasound imaging-guided photothermal-chemotherapy
Authors: Mou Chongyan , Yang Yang , Bai Yan , Yuan Pei , Wang Yiwu , Zhang Liangke
Published: January 2019

Hyaluronic acid and polydopamine functionalized phase change nanoparticles for ultrasound imaging-guided photothermal-chemotherapy.
Multicolored one-dimensional photonic crystal coatings with excellent mechanical robustness, strong substrate adhesion, and liquid and particle impalement resistance
Authors: Niu Wenbin , Zhang Lele , Wang Yunpeng , Zhang Shufen
Published: January 2019

Multicolored one-dimensional photonic crystal coatings with excellent mechanical robustness, strong substrate adhesion, and liquid and particle impalement resistance are rationally designed and fabricated using atomic layer deposition.
From gallium-based supramolecular square nanoplates to γ-Ga2O3 layer nanosheets
Authors: Wang Ya Qian , Song Le Xin , Teng Yue , Wang Fang , Wang Wei Ping , Ruan Mao Mao , Yang Zun , Xu Zhe Yuan
Published: January 2019

Application of a grinding-heating strategy in the controlled synthesis of gallium-based supramolecular square nanoplates and γ-Ga2O3 layer nanosheets.
A review of arsenic exposure and lung cancer
Authors: Wei Shuhui , Zhang Hong , Tao Shasha
Published: January 2019

As a well-established human carcinogen, arsenic has increased the risk of lung cancer over the past decades.
Storing and releasing rhodamine as a model hydrophobic compound in polydimethylsiloxane microfluidic devices
Authors: Adiraj Iyer M. , Eddington D. T.
Published: January 2019

Polydimethylsiloxane (PDMS) is known to absorb small hydrophobic molecules. We propose to leverage this material to store and release small hydrophobic molecules into and from the PDMS matrix. This method could be used to deliver small hydrophobic molecules to microfluidic channels from the walls of a microfluidic device.
Correction: Correlation between the electronic/local structure and CO-oxidation activity of PdxRu1−x alloy nanoparticles
Authors: Song Chulho , Tayal Akhil , Seo Okkyun , Kim Jaemyung , Chen Yanna , Hiroi Satoshi , Kumara L. S. R. , Kusada Kohei , Kobayashi Hirokazu , Kitagawa Hiroshi , Sakata Osami
Published: January 2019

Correction for ‘Correlation between the electronic/local structure and CO-oxidation activity of PdxRu1−x alloy nanoparticles’ by Chulho Song et al., Nanoscale Adv., 2019, DOI: 10.1039/c8na00305j.
AlPcS-loaded gold nanobipyramids with high two-photon efficiency for photodynamic therapy in vivo
Authors: Wang Jing , Zhuo Xiaolu , Xiao Xiao , Mao Rihua , Wang Yong , Wang Jianfang , Liu Jun
Published: January 2019

Recent years have witnessed significant progress in the field of two-photon-activated photodynamic therapy (TP-PDT).
Correction: A platform for nanomagnetism – assembled ferromagnetic and antiferromagnetic dipolar tubes
Authors: Stanković Igor , Dašić Miljan , Otálora Jorge A. , García Carlos
Published: January 2019

Correction for ‘A platform for nanomagnetism – assembled ferromagnetic and antiferromagnetic dipolar tubes’ by Igor Stanković et al., Nanoscale, 2019, DOI: 10.1039/c8nr06936k.
Programmed synthesis of triarylnitroimidazoles via sequential cross-coupling reactions
Authors: Raina Gaurav , Kannaboina Prakash , Mupparapu Nagaraju , Raina Sushil , Ahmed Qazi Naveed , Das Parthasarathi
Published: January 2019

Transition-metal-catalyzed programmed sequential arylation of 2-chloro-4-nitro-1H-imidazoles was achieved.
Correction: A 3D petal-like Ni3S2/CoNi2S4 hybrid grown on Ni foam as a binder-free electrode for energy storage
Authors: Chen Fangshuai , Wang Hui , Ji Shan , Linkov Vladimir , Wang Rongfang
Published: January 2019

Correction for ‘A 3D petal-like Ni3S2/CoNi2S4 hybrid grown on Ni foam as a binder-free electrode for energy storage’ by Fangshuai Chen et al., Sustainable Energy Fuels, 2018, 2, 1791–1798.
Association between the ICAM-1 gene polymorphism and coronary heart disease risk: a meta-analysis
Authors: Yin De-lu , Zhao Xin-hua , Zhou Yi , Wang Ying , Duan Ping , Li Qun-xing , Xiong Zheng , Zhang Yang-yang , Chen Yu , He Hong , Yang Kai , Song He-jian
Published: January 2019

Coronary heart disease (CHD) is a complex polygenic disease in which gene-environment interactions play a critical role in disease onset and progression. The Intercellular adhesion molecule 1 (ICAM-1) gene E469K polymorphism is one of the most commonly studied polymorphisms in this gene because of its association with CHD risks, but results were conflicting. The PubMed, Embase, and China National Knowledge Infrastructure databases were searched for case–control studies published up to November 2018. Pooled odds ratios (ORs) and 95% confidence intervals (95% CIs) were calculated to assess the association. Eleven eligible studies, comprising 3435 cases and 3199 controls, were included in the meta-analysis. The pooled result showed that the ICAM-1 gene E469K polymorphism was significantly associated with an increased risk of CHD (OR = 1.20, 95% CI = 1.11–1.29, for the allele K versus allele E; OR = 1.66, 95% CI = 1.43–1.92, for the K allele carriers versus EE). Subgroup analysis supported the results in the Chinese populations and in the Caucasian populations. This meta-analysis suggests that the ICAM-1 gene K469E polymorphism is associated with CHD risk and the K allele is a more significant risk factor for developing CHD amongst Chinese and Caucasians populations.
Adenine nucleotides as paracrine mediators and intracellular second messengers in immunity and inflammation
Authors: Fliegert Ralf , Heeren Jörg , Koch-Nolte Friedrich , Nikolaev Viacheslav O. , Lohr Christian , Meier Chris , Guse Andreas H.
Published: January 2019

Adenine nucleotides (AdNs) play important roles in immunity and inflammation. Extracellular AdNs, such as adenosine triphosphate (ATP) or nicotinamide adenine dinucleotide (NAD) and their metabolites, act as paracrine messengers by fine-tuning both pro- and anti-inflammatory processes. Moreover, intracellular AdNs derived from ATP or NAD play important roles in many cells of the immune system, including T lymphocytes, macrophages, neutrophils and others. These intracellular AdNs are signaling molecules that transduce incoming signals into meaningful cellular responses, e.g. activation of immune responses against pathogens.
Terahertz frequency selective surface based on metal‐graphene structure with independent frequency tuneability
Authors: Wang Da‐Wei , Zhao Wen‐Sheng , Wang Rui‐Zhen , Chen Wenchao , Yin Wen‐Yan
Published: January 2019

This study proposes a set of tuneable terahertz (THz) frequency selective surfaces (FSSs) based on the metal‐graphene structure. By the numerical technique, the transmission characteristics of the proposed FSSs are investigated in detail. In particular, the independent frequency tuneability of the proposed multiband FSS is demonstrated, i.e. the resonant frequency of each band can be tuned independently without affecting other bands. Such flexibility makes the proposed FSSs practical and potential for various THz applications including filters, radomes, polarisers, and sensors.
LQR controller design for quad‐rotor helicopters
Authors: Okyere Emmanuel , Bousbaine Amar , Poyi Gwangtim T. , Joseph Ajay K. , Andrade Jose M.
Published: January 2019

This paper presents an analysis and performance of a LQR control algorithm for quadrotor helicopters. For a successful analysis, first the dynamic model has been developed for the quadcopter and then the controller was designed, tuned, and tested. In tuning the LQR, much attention was given to the feedback gain matrix (K). The controller's performance was verified in terms of delay time, rise time, overshoot, settling time, and tolerance limits. The overall performance of the LQR controller was analysed.
Properties and magnetic origins of solar S-bursts
Authors: Clarke Brendan P. , Morosan Diana E. , Gallagher Peter T. , Dorovskyy Vladimir V. , Konovalenko Alexander A. , Carley Eoin P.
Published: January 2019

Context. Solar activity is often accompanied by solar radio emission, consisting of numerous types of solar radio bursts. At low frequencies (<100 MHz) radio bursts with short durations of milliseconds, such as solar S-bursts, have been identified. To date, their origin and many of their characteristics remain unclear.

Aims. We report observations from the Ukrainian T-shaped Radio telescope, (UTR-2), and the LOw Frequency ARray (LOFAR) which give us new insight into their nature.

Methods. Over 3000 S-bursts were observed on 9 July 2013 at frequencies of 17.4–83.1 MHz during a period of low solar activity. Leading models of S-burst generation were tested by analysing the spectral properties of S-bursts and estimating coronal magnetic field strengths.

Results. S-bursts were found to have short durations of 0.5–0.9 s. Multiple instruments were used to measure the dependence of drift rate on frequency which is represented by a power law with an index of 1.57. For the first time, we show a linear relation between instantaneous bandwidth and frequency over a wide frequency band. The flux calibration and high sensitivity of UTR-2 enabled measurements of their fluxes, which yielded 11 ± 3 solar flux units (1 SFU ≡ 104 Jy). The source particle velocities of S-bursts were found to be ∼0.07 c. S-burst source heights were found to range from 1.3 R⊙ to 2 R⊙. Furthermore, a contemporary theoretical model of S-burst generation was used to conduct remote sensing of the coronal magnetic field at these heights which yielded values of 0.9–5.8 G. Within error, these values are comparable to those predicted by various relations between magnetic field strength and height in the corona.
UV core dimming in coronal streamer belt and the projection effects
Authors: Abbo L. , Giordano S. , Ofman L.
Published: January 2019

During solar minimum activity, the coronal structure is dominated by a tilted streamer belt, associated with the sources of the slow solar wind. It is known that some UV coronal spectral observations show a quite evident core dimming in heavy ions emission in quiescent streamers. In this paper, our purpose is to investigate this phenomenon by comparing observed and simulated UV coronal ion spectral line intensities. First, we computed the emissivities and the intensities of HI Lyα and OVI spectral lines starting from the physical parameters of a time-dependent 3D three-fluid MHD model of the coronal streamer belt. The model is applied to a tilted dipole (10°) solar minimum magnetic structure. Next, we compared the results obtained from the model in the extended corona (from 1.5 to 4 R⊙) to the UV spectroscopic data from the Ultraviolet Coronagraph Spectrometer (UVCS) onboard SOHO during the minimum of solar activity (1996). We investigate the line-of-sight integration and projection effects in the UV spectroscopic observations, disentangled by the 3D multifluid model. The results demonstrate that the core dimming in heavy ions is produced by the physical processes included in the model (i.e., combination of the effects of heavy ion gravitational settling, and energy exchange of the preferentially heated heavy ions through the interaction with electrons and protons) but it is visible only in some cases where the magnetic structure is simple, such as a (tilted) dipole.
Constraining transport of angular momentum in stars
Authors: den Hartogh J. W. , Eggenberger P. , Hirschi R.
Published: January 2019

Context. Transport of angular momentum has been a challenging topic within the stellar evolution community, even more since the recent asteroseismic surveys. All published studies on rotation using asteroseismic observations show a discrepancy between the observed and calculated rotation rates, indicating there is an undetermined process of angular momentum transport active in these stars.

Aims. We aim to constrain the efficiency of this process by investigating rotation rates of 2.5 M⊙ stars.

Methods. First, we investigated whether the Tayler-Spruit dynamo could be responsible for the extra transport of angular momentum for stars with an initial mass of 2.5 M⊙. Then, by computing rotating models including a constant additional artificial viscosity, we determined the efficiency of the missing process of angular momentum transport by comparing the models to the asteroseismic observations of core helium burning stars. Parameter studies were performed to investigate the effect of the stellar evolution code used, initial mass, and evolutionary stage. We evolved our models into the white dwarf phase, and provide a comparison to white dwarf rotation rates.

Results. The Tayler-Spruit dynamo is unable to provide enough transport of angular momentum to reach the observed values of the core helium burning stars investigated in this paper. We find that a value for the additional artificial viscosity νadd around 107 cm2 s−1 provides enough transport of angular momentum. However, the rotational period of these models is too high in the white dwarf phase to match the white dwarf observations. From this comparison we infer that the efficiency of the missing process must decrease during the core helium burning phase. When excluding the νadd during core helium burning phase, we can match the rotational periods of both the core helium burning stars and white dwarfs.
Residual Stresses Distributions in Grinding of 3J33 Maraging Steel with Miniature Electroplated CBN Wheel
Authors: Shen Shouguo , Li Beizhi , Guo Weicheng
Published: January 2019

It is well known that the residual stresses on the ground surface and the subsurface can influence the service quality of a component, such as fatigue life, tribological properties, and distortion. In this paper, an experimental investigation was conducted to determine the effects of grinding force, temperature and grinding conditions, such as grinding speed, workpiece speed and grinding depth, on the surface and in-depth residual stresses distributions induced by grinding of 3J33 maraging steel with the miniature electroplated CBN Wheels. The results show that a ‘hook’ shaped residual stress profile is generated with the maximum compressive stresses occur at the depth of 3-14 ?m below the ground surface. There is a good correlation between residual stress and cutting force, but the trend related to grinding temperature is not obvious. The main grinding parameters affecting the residual stresses distributions is grinding speed, while the workpiece speed and grinding depth have the least effect.
Corneal Biomechanical Properties Characterization Using Air-jet Indentation Based Optical Coherence Tomography System (AIOCT)
Authors: Wang Li-ke , Zhang Jia-ying , Li Tian-jie , Zhang Xue-yong , Tian Lei , Zheng Yong-ping
Published: January 2019

We proposed a novel method together with system to quantify the corneal biomechanics. The objectives of this study are to develop a method to measure the corneal biomechanical propertiesin vivoand to evaluate the performance of AIOCT system. A novel AIOCT system was established and a mathematical model was built on the basis of the current air-jet indentation method. Experiments were performed to evaluate the mechanical properties of eleven custom-made silicone corneal mimicking phantoms by the AIOCT system under different intraocular pressures (IOP). The results were then compared with those measured by the standard mechanical tensile test and indentation test. The phantom’s moduli were ranged from 0.08 to 1.03 MPa according to the tensile and indentation test. The elastic moduli of corneal silicone phantoms (Eairjet) were measured using the AIOCT system with the proposed mathematical model at four IOPs (0.6, 15.3, 29.8, and 44.7 mmHg). TheEairjetwere agreed well with the corresponding moduli (Etensile) measured by the tensile test (Eairjet= 1.188Etensile,R2= 0.925). The preliminary results showed that this technique was capable of measuring corneal biomechanical propertiesin vivoand it may provide a clinical potential non-invasive and non-contact means to the diagnosis of keratoconus suspects in the future.
Aerodynamic Analysis of Blended Wing Body - Unmanned Aerial Vehicle (BWB-UAV) Equipped with Horizontal Stabilizers
Authors: Mohd Saad Nornashiha , Wisnoe Wirachman , Mohd Nasir Rizal Effendy , Mohd Ali Zurriati , Askari Ehan Sabah Shukri
Published: January 2019

This paper presents an aerodynamic characteristic study in longitudinal direction of UiTM Blended Wing Body-Unmanned Aerial Vehicle Prototype (BWB-UAV Prototype) equipped with horizontal stabilizers. Flight tests have been conducted and as the result, BWB experienced overturning condition at certain angle of attack. Horizontal stabilizer was added at different location and size to overcome the issue during the flight test. Therefore, Computational Fluid Dynamics (CFD) analysis is performed at different configuration of horizontal stabilizer using Spalart - Allmaras as a turbulence model. CFD simulation of the aircraft is conducted at Mach number 0.06 or v = 20 m/s at various angle of attack, α. The data of lift coefficient (CL), drag coefficient (CD), and pitching moment coefficient (CM) is obtained from the simulations. The data is represented in curves against angle of attack to measure the performance of BWB prototype with horizontal stabilizer. From the simulation, configuration with far distance and large horizontal stabilizer gives steeper negative pitching moment slope indicating better static stability of the aircraft.
Analysis and Verification on Mechanics Mechanism for Flat Digging of Grab
Authors: Xu Chang , Xiao Hanbin , Zou Sheng , Zhu Feng
Published: January 2019

The research on digging resistances is the key to designing the grab, improving the grab’s structure and realizing the automatic flat digging of grab dredger. This article focuses on the mechanical analysis and experimental research of grab’s flat digging combining with theoretical calculation and experiments in dredging process. The theoretical digging resistances in both horizontal and vertical directions have been investigated in mathematical model. With the help of flat digging experiments, the forces on hoist rope and closing rope have been recorded. Then, work out the horizontal and vertical digging resistances based on moment balance. Since a good agreement is achieved between the theoretical calculations with the corresponding independent experimental results, the research has been verified and provides technical support for flat digging in dredging process.
Research and Implementation of Key Technology for Calculation of Acquiring Simulation Training System
Authors: Xue Xuedong , Zhang Shuai , Luo Ya , Qin Jian , Zhao Qinglan
Published: January 2019

For a missile acquiring system, there are problems such as high system failure rate, poor acquiring computer maintainability and loopholes in the calculation program during the training process of the troops. For this purpose, the acquiring professional training can get rid of the dependence on the actual equipment, and provide good hardware conditions for the training of the troops and the teaching of the college, a missile acquiring simulation training system is designed and constructed. The key to acquiring simulation training system software design is acquiring calculation, and the two technical difficulties in acquiring calculation are data format conversion and data output precision control. This paper focuses on the basic algorithms and implementation methods of self-test calculation, data format conversion and data output precision control, and solves the key technical problems of acquiring calculation in the acquiring training software.
Design of Temperature Fluctuation Test Platform Based on Radiation Heat Transfer
Authors: Xiao Han , Ying Zhou , Ruijin Jia , Wang Zijuan
Published: January 2019

The optical characteristics of the space science detectors are very sensitive to the temperature fluctuation. In order to study the effect of it, a method to simulate the temperature fluctuation was put forward in this paper, and the feasibility of this method was verified numerically. A radiation disturbance was artificially applied at a certain distance from the test platform, so that the surface temperature of the platform changed periodically with the radiation heater. The results show that the radiation heat transfer disturbance could produce a temperature fluctuation on the test platform, which provides a reliable theoretical support for the time-varying temperature control system.
Energy Saving System by Means of Electrical and Geo-Referential Identification of Load
Authors: Reynoso Carlos , Cruz Erick , Palomo Pedro , Chauca Mario
Published: January 2019

In this project you have the control of the passage of the current in each outlet, for example, in a house where each outlet will be registered with a certain continuous electrical power for appliances, computers, among others. Every electrical device that has been registered and is connected to any outlet will work, if any other device that has not been registered is connected, it will not work in any socket. In addition, once any power outlet is connected, the system will detect where it is connected and we will know the place where it was connected. With this project, we will have a lower cost of electricity and economic savings. Keywords: Arduino, Sensor, Electric Current, Saving, Hall.
Research and Experimental of MRI RF High Power Bridge
Authors: Zhou Jiaping , Li Yingliang , Chen Hua
Published: January 2019

A micro-scale 3dB high power RF (Radio Frequency) balance 4 Ports Bridge of MRI (Magnet Resonator Imaging) is realized with 3D PCB manufacturing and integrated capacity and theoretical calculation in this paper . At first a analysis method is proposed based on transmission line theory of the 1/4-wavelength and the lump and transmission parameters, and the transmisson line length and lump components of capacitors value are gotted for this micro-scale bridge. Then this Micro-Balance Bridge (MBB) manufacturing with FR4 and overall size is 100mm 60 mm 1 mm, and it size reduce 1/3 compared with plane bridge. MBB could be achieved 2 ways amplitude balance is about 0.1dB, phase balance is 1 , insert loss is about 0.3dB, flatness is not more than 0.01dB on the operate frequency of 64MHZ 5MHZ. This bridge could be supported input pulse power more than 1000 W by temperature experiment result. Use MBB integrate into the MRI systems and make imaging experiment and could reduce 20% imaging time from 1.2 ms to 900us, and it has good efficiency and homogeneity.
Spare Pose Graph Decomposition and Optimization for SLAM
Authors: Liu Tian , Chen Yongfu , Jin Zhiyong , Li Kai , Wang Zhenting , Zheng Jiongzhi
Published: January 2019

The graph optimization has become the mainstream technology to solve the problems of SLAM (simultaneous localization and mapping). The pose graph in the graph based SLAM is consisted with a series of nodes and edges that connect the adjacent or related poses. With the widespread use of mobile robots, the scale of pose graph has rapidly increased. Therefore, optimizing a large-scale pose graph is the bottleneck of application of graph based SLAM. In this paper, we propose an optimization method basing on the decomposition of pose graph, of which we have noticed the sparsity. With the extraction of the Single-chain and the Parallel-chain, the pose graph is decomposed into many small subgraphs. Compared with directly processing the original graph, the speed of calculation is accelerated by separately optimizing the subgraph, which is because the computational complexity is increasing exponentially with the increase of the graph’s scale. This method we proposed is very suitable for the current multi-threaded framework adopted in the mainstream SLAM, which separately calculate the subgraph decomposed by our method, rather than the original optimization requiring a large block of time in once may cause CPU obstruction. At the end of the paper, our algorithm is validated with the open source dataset of the mobile robot, of which the result illustrates our algorithm can reduce the one-time resource consumption and the time consumption of the calculation with the same map-constructing accuracy.
Shape Design of Cable-net for Parabolic Cylindrical Deployable Antenna
Authors: Zhang Han , Dong Bo , Zhang Yiqun , Li Na
Published: January 2019

A method of cable-net shape design based on the equilibrium matrix method is proposed for a new parabolic cylindrical deployable antenna structure with fewer modules. And the inverse iteration method is adopted to find the shape of cable-truss structure with considering the truss deformation induced by cable tension. Firstly, the ideal geometrical configuration of the locally symmetric support cable is designed for the given truss. Then, the pretension distribution of the cable is solved by the equilibrium matrix method under the circumstance of the unchanged topology of cable-net structure, position of nodes and boundary condition. In addition, the inverse iteration method is adopted to find the shape of cable-truss structure. Finally, the validity of the method is verified by simulation analysis.
Génétique et origine d’Homo sapiens
Authors: Henry Jean-Pierre
Published: January 2019

La comparaison de l’ADN d’Homo sapiens avec celui des grands singes ou des hommes archaïques informe sur les mécanismes de l’hominisation. Le séquençage de 1 000 génomes bien identifiés géographiquement a permis des études génomiques. En utilisant la diversité régionale des génotypes, un modèle de généalogie d’Homo sapiens a été proposé. L’origine de l’homme moderne est africaine et date d’environ 200 000 ans ; Il est sorti d’Afrique il y a 50 000 à 100 000 ans et a alors envahi le reste du monde. En Europe et en Asie, il a rencontré les hommes archaïques (Néanderthal et Denisova) et la présence de 1 à 3 % d’ADN néanderthalien dans le génome de l’homme moderne atteste de croisements entre les espèces. Certains gènes provenant de ces croisements ont été sélectionnés.
Effects of N2/CO2 dilution on flame propagation velocities and quenching distances of oxy-methane premixed mixtures using an Annular-Stepwise-Diverging-Tube (ASDT)
Authors: Kim Hun Young , Lee Jiseop , Kim Nam Il
Published: January 2019

Many combustion systems use the technique called exhaust gas recirculation. Thus, the effects of N2/CO2 dilution on the combustion characteristics have been of interest. In this study, the dilution effects on the flame propagation velocity (FPV) of an oxy-methane premixed mixture were investigated using a state-of-the-art annular stepwise diverging tube. The relationship between FPV and the length scale was measured for various equivalence ratios in the dilution ratio range 65–75% N2 and 50–65% CO2. The characteristic variations of FPV in each dilution case could be described as a surface in a concentration–length–velocity diagram, and this provides a bird’s eye view of the dilution effects on flame propagation. Two distinctive scalar values of the quenching distance and the critical FPV were investigated. At the same dilution ratio, CO2 dilution caused more significant variation than N2 dilution did regarding FPV, quenching distance, and flammable limits. In particular, the critical FPV was compared with the laminar burning velocity (LBV) calculated using a PREMIX code employing GRI-3.0. In addition, fictitious species (F-N2/F-CO2) were used in the reaction mechanism to distinguish chemical effects. Conclusively, results showed that CO2 dilution reduced LBV significantly not only by its larger thermal capacity but also by its active involvement in the chemical reaction.
Tibiakopf: Repositions- und Osteosynthesetechniken
Authors: Wichlas Florian , Freude Thomas
Published: January 2019

Während die Versorgung einfacher Tibiakopffrakturen selten Probleme verursacht,
stellen komplexe Luxationsfrakturen eine Herausforderung dar. Die Behandlung ist
aufwendig und erfordert viel Erfahrung, da häufig nicht nur der Knochen
betroffen ist, sondern auch die Weichteile. Trümmerzonen, die eine anatomische
Reposition unmöglich machen, anatomische Areale der Gelenkfläche, die schwer
erreichbar sind und das hohe Komplikationsrisiko führen dazu, dass diese
Frakturen von erfahrenen Operateuren versorgt werden sollten. Die Kombination
aus einer exzellenten präoperativen Bildgebung, einer sich aus dieser ergebenden
Frakturanalyse und OP-Planung und das Wissen um aktuelle OP-Verfahren ist der
Schlüssel zu einer guten Versorgung von Tibiakopffrakturen. Zur Prädiktion des
langfristigen Outcomes sind 2 Faktoren entscheidend. Zum einen die
Frakturschwere 1, 28, insbesondere das Ausmaß der Gelenkbeteiligung 29; zum Zweiten die exakte intraoperative
anatomische Reposition 30, 31. Zusammenfassend müssen jedoch gemäß aktueller
Literatur für B3-/C3-Frakturen die schlechtesten Ergebnisse für die klinischen
Scores erwartet werden 3, 6.
Cluster-randomisierte Studien: Methodische und praktische Aspekte
Authors: Dreyhaupt Jens , Mayer Benjamin , Kaluscha Rainer , Muche Rainer
Published: January 2019

Häufig wird kritisiert, dass in der Rehabilitationsforschung zu wenig randomisierte Studien durchgeführt werden, um methodisch hochwertige Evidenz zu erhalten. Allerdings wird auch anerkannt, dass sich das Design der doppel-blinden, Placebo-kontrollierten, randomisierten Studie häufig nicht einfach in die Rehabilitationsforschung übertragen lässt. Zum einen steht hier die Validität in Bezug auf den Versorgungsaspekt im Fokus, sodass Treatment-as-usual anstelle der Placebo-Behandlung als Referenz dient und eine Doppelverblindung teilweise nicht definierbar ist. Weiterhin ist es aufgrund fehlender Kapazitäten oft schwierig, 2 ähnliche Therapieformen in einer Rehabilitationseinrichtung parallel durchzuführen. Ferner sind Kontaminationseffekte zu befürchten, wenn sich Rehabilitanden unterschiedlicher Studienarme über ihre Therapie austauschen. Hier bieten sich cluster-randomisierte Studien an, welche allerdings im Vergleich zu individuell randomisierten Studien meist höhere Fallzahlen, eine komplexere Methodik der Fallzahlplanung sowie umfassendere Methoden der statistischen Auswertung erfordern.

Im Beitrag werden Vor- und Nachteile sowie Besonderheiten der Cluster-Randomisierung dargestellt und Hinweise zu ihrer Umsetzung im Bereich der Rehabilitationsforschung gegeben.
Life-threatening visceral complications after intragastric balloon insertion: Is the device, the patient or the doctor to blame?
Authors: Stavrou George , Tsaousi Georgia , Kotzampassi Katerina
Published: January 2019

Background and aim Intragastric balloon placement is established as a safe, relatively low-cost and well-tolerated minimally invasive procedure for weight loss, giving encouraging results under the strict prerequisite that the obese patient will enroll in a medically supervised weight loss program. This retrospective study reviews already published cases of severe visceral complications for the purpose of assigning responsibility to the device, the patient, or the doctor.

Methods We reviewed PubMed and Scopus archived publications describing intragastric balloon (BIB/Orbera)-related severe visceral complications, i. e. perforations and obstructions.

Results Twenty-two cases of gastric perforation, two cases of esophageal perforation and 10 cases of bowel obstruction were found. For the gastric perforation the endoscopist was responsible in nine cases, the patient in four, and the balloon itself in nine. For the two cases of esophageal perforation, the endoscopists were responsible, while for the 12 cases of bowel obstruction, the patient was responsible for seven and the device for the other five cases.

Conclusion BIB/Orbera balloon insertion remains a safe procedure, with a minimum of complications related to hollow viscera. Mandatory education and accreditation of physicians dealing with bariatric endoscopy and strict supervision of the obese individuals, while living with the balloon, will eliminate such complications.