bluuebunny/crossref_metadata_2025 huggingface dataset:
Improving the capability of UiO-66 for Cr(vi) adsorption from aqueous solutions by introducing isonicotinate N-oxide as the functional group
Authors: Shokouhfar Nasrin , Aboutorabi Leila , Morsali Ali
Published: September 2018

In this study, we showed that a conceptual design can be helpful in synthesizing environmentally safe and stable adsorbents along with suitable adsorption parameters.
Use of two structurally similar small molecular acceptors enabling ternary organic solar cells with high efficiencies and fill factors
Authors: Liu Tao , Luo Zhenghui , Fan Qunping , Zhang Guangye , Zhang Lin , Gao Wei , Guo Xia , Ma Wei , Zhang Maojie , Yang Chuluo , Li Yongfang , Yan He
Published: September 2018

Ternary OSCs fabricated with two acceptors with similar absorption spectra achieved the best PCE of 14.13% with an impressive FF of 78.2%.
Using chromate to investigate the impact of mineral–organic contact time on the surface reactivity of goethite
Authors: Hales-Messenger Stacey , Swindle Andrew
Published: September 2018

Chromate was used as a chemical probe to investigate the impact of mineral–organic contact time on the surface reactivity of two different sizes of goethite particles.
Resonance ionization of titanium: high useful yield and new autoionizing states
Authors: Trappitsch Reto , Savina Michael R. , Isselhardt Brett H.
Published: September 2018

To facilitate analyses of trace amounts of titanium in atom-limited samples, we established a new three-step resonance ionization scheme. Using time-of-flight mass spectrometry we show that the new scheme can be easily saturated, yields stable isotope measurements, and can achieve an overall useful yield of 18%.
Nanodiamond-based non-canonical autophagy inhibitor synergistically induces cell death in oxygen-deprived tumors
Authors: Chen Nan , Han Yuping , Luo Yao , Zhou Yanfeng , Hu Xingjie , Yu Yun , Xie Xiaodong , Yin Min , Sun Jinli , Zhong Wenying , Zhao Yun , Song Haiyun , Fan Chunhai
Published: September 2018

Blockage of autophagic flux by nanodiamonds induces apoptosis in hypoxic tumor cells with minimal toxicity to normal tissues and enhances the effects of anti-angiogenic therapy.
Bi2OS2: a direct-gap two-dimensional semiconductor with high carrier mobility and surface electron states
Authors: Zhang Xiwen , Wang Bing , Niu Xianghong , Li Yunhai , Chen Yunfei , Wang Jinlan
Published: September 2018

Bi2OS2 nanosheets possess tunable anomalous layer-dependent bandgaps, derived from the synergetic effect of the quantum confinement and surface electron states.
Anti-cancer effects of wedelolactone: interactions with copper and subcellular localization
Authors: Kučírková Tereza , Stiborek Marek , Dúcka Monika , Navrátilová Jarmila , Bogdanović Pristov Jelena , Popović-Bijelić Ana , Vojvodić Snežana , Preisler Jan , Kanický Viktor , Šmarda Jan , Spasojević Ivan , Beneš Petr
Published: September 2018

Wedelactone (WL), a plant polyphenolic derivative of coumestan, represents a promising anti-cancer agent. The underlying mechanisms of its action are not fully understood and appear to involve interplay with copper ions. Herein, we examined coordination and redox interactions of WL with Cu2+ in phosphate buffer (pH 7), and in two breast cancer cell lines. EPR, UV-Vis and fluorescence spectroscopy showed that WL and Cu2+ build a coordination complex with 2 : 1 stoichiometry and distorted tetrahedral geometry. WL showed strong fluorescence that was quenched by Cu2+. The sequestration of the intracellular copper pool with neocuproine led to a significant drop in the cytotoxic effects of WL, whereas the co-application of Cu2+ and WL and the formation of an extracellular complex suppressed both the cytotoxic effects of WL and copper loading. Fluorescence microscopy showed that WL is mainly localized in the cytosol and significantly less in the nuclei. WL fluorescence was stronger in cells pretreated with neocuproine, implying that the complex of WL and Cu2+ is formed inside the cells. WL caused a two-fold increase in the lysosomal level of copper as well as copper-dependent lysosome membrane permeabilization. On the other hand, the protective effects of overexpression of thioredoxin 1 imply that WL exerts the main oxidative impact inside the nucleus. The interactions of WL with copper may be essential for therapeutic performance and selectivity against cancer cells, taking into account that a number of cancer types, including breast cancer, exhibit increased intratumoral copper levels or altered copper distribution.
Gold-catalyzed tandem reaction of 2-alkynylanilines followed by 1,6-conjugate addition to p-quinone methides: efficient access to unsymmetrical diarylindolylmethanes
Authors: Jillella Raveendra , Oh Dong hwan , Oh Chang Ho
Published: September 2018

A simple, mild, efficient and chemoselective catalytic method for the straightforward synthesis of an interesting class of 2-aryl/alkyl-substituted-3-diaryl indolyl methanes in high yield is reported.
Hot off the Press
Authors: Hill Robert A. , Sutherland Andrew
Published: September 2018

A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as huperphlegmine A from Huperzia phlegmaria.
Bulk-free topological insulator Bi2Se3 nanoribbons with magnetotransport signatures of Dirac surface states
Authors: Kunakova Gunta , Galletti Luca , Charpentier Sophie , Andzane Jana , Erts Donats , Léonard François , Spataru Catalin D. , Bauch Thilo , Lombardi Floriana
Published: September 2018

Many applications of topological insulators (TIs) as well as new phenomena require devices with reduced dimensions.
Demonstration of temperature-plateau superheated liquid by photothermal conversion of plasmonic titanium nitride nanostructures
Authors: Ishii Satoshi , Kamakura Ryosuke , Sakamoto Hiroyuki , Dao Thang D. , Shinde Satish L. , Nagao Tadaaki , Fujita Koji , Namura Kyoko , Suzuki Motofumi , Murai Shunsuke , Tanaka Katsuhisa
Published: September 2018

When photothermally superheated liquid is on a high thermal conductive substrate, the liquid temperature stays constant for a certain range of incident laser power before bubbles are formed.
The study of a novel cobalt-implanted pyridylporphyrin/graphene oxide nanohybrid for enhanced photocatalytic hydrogen evolution and its electron transfer mechanism
Authors: Zhu Kun , Luo Qiang , Kang Shi-Zhao , Qin Lixia , Li Guodong , Li Xiangqing
Published: September 2018

A metallic cobalt nanoparticle-implanted 5,15-diphenyl-10,20-di(4-pyridyl) porphyrin (DPyP)/graphene oxide (GO) nanohybrid (GO-Co-DPyP) was facilely fabricated.
Correction: Modelling of thermal transport through a nanocellular polymer foam: toward the generation of a new superinsulating material
Authors: Wang Guilong , Wang Chongda , Zhao Jinchuan , Wang Guizhen , Park Chul B. , Zhao Guoqun , Van De Walle Wouter , Janssen Hans
Published: September 2018

Correction for ‘Modelling of thermal transport through a nanocellular polymer foam: toward the generation of a new superinsulating material’ by Guilong Wang et al., Nanoscale, 2017, 9, 5996–6009.
Preparation of oxazolines and oxazolesviaa PhI(OAc)2-promoted cyclization ofN-propargylamides
Authors: Yi Wei , Liu Qing-Yun , Fang Xing-Xiao , Lou Sheng-Chun , Liu Gong-Qing
Published: September 2018

A metal-free cyclization ofN-propargylamides for the synthesis of various oxazodines and oxazolesviaa 5-exo-digprocess is reported herein.
Self-assembly of a redox-active bolaamphiphile into supramolecular vesicles
Authors: Rothenbühler Simon , Bösch Caroline D. , Langenegger Simon M. , Liu Shi-Xia , Häner Robert
Published: September 2018

Self-assembly of a redox-active bolaamphiphile leads to the formation of narrow-bandgap supramolecular vesicles.
Main-chain degradable star polymers comprised of pH-responsive hyperbranched cores and thermoresponsive polyethylene glycol-based coronas
Authors: Wais Ulrike , Chennamaneni Lohitha Rao , Thoniyot Praveen , Zhang Haifei , Jackson Alexander W.
Published: September 2018

Dual stimuliresponsive main-chain degradable star hyperbranched polymers have been synthesized via cyclic ketene acetal radical ring-opening and RAFT-based methacrylate copolymerization.
Effect of free ammonia inhibition on NOB activity in high nitrifying performance of sludge
Authors: Zhang Fan , Yang Hong , Wang Jiawei , Liu Ziqi , Guan Qingkun
Published: September 2018

The inhibition of free ammonia (FA) on nitrite-oxidizing bacteria (NOB) was investigated using an enriched NOB community with high nitrifying performance.
Correction: A guanidyl-functionalized TiO2 nanoparticle-anchored graphene nanohybrid for enhanced capture of phosphopeptides
Authors: Liu Hailong , Lian Bin
Published: September 2018

Correction for ‘A guanidyl-functionalized TiO2 nanoparticle-anchored graphene nanohybrid for enhanced capture of phosphopeptides’ by Hailong Liu et al., RSC Adv., 2018, 8, 29476–29481.
Degradable polymer prodrugs with adjustable activity from drug-initiated radical ring-opening copolymerization
Authors: Guégain Elise , Tran Johanna , Deguettes Quentin , Nicolas Julien
Published: September 2018

Degradable polymer prodrugs were synthesized by ‘drug-initiated’ nitroxide-mediated radical ring-opening copolymerization and led to either nanoparticles or soluble prodrugs with adjustable cytotoxicity on two different cancer cell lines.
Homodimerization driven self-assembly of glycoluril molecular clips with covalently immobilized poly(ε-caprolactone)
Authors: Gosecka Monika , Urbaniak Malgorzata , Mikina Maciej , Gosecki Mateusz , Rozanski Artur
Published: September 2018

We synthesized the first glycoluril clip–polymer conjugate, which forms a novel type of multilayered self-assembly.
Triple cation additive NH3+C2H4NH2+C2H4NH3+-induced phase-stable inorganic α-CsPbI3 perovskite films for use in solar cells
Authors: Ding Xihong , Chen Haibin , Wu Yahan , Ma Shuang , Dai Songyuan , Yang Shangfeng , Zhu Jun
Published: September 2018

We demonstrate that employing a small quantity of triple cation NH3+C2H4NH2+C2H4NH3+ (denoted as DETA3+) could effectively stabilize mutable α-CsPbI3 for 60 d via a facile one-step deposition method without any encapsulation.
Molecular simulation and experimental investigation of CO2 capture in a polymetallic cation-exchanged 13X zeolite
Authors: Chen Shujun , Zhu Min , Tang Yingchun , Fu Yue , Li Wenliang , Xiao Bo
Published: September 2018

A molecular simulation approach can guide the design of high-performance LiPdAgX zeolite for CO2 capture from flue gas.
Robust aerogels based on conjugated microporous polymer nanotubes with exceptional mechanical strength for efficient solar steam generation
Authors: Mu Peng , Bai Wei , Zhang Zheng , He Jingxian , Sun Hanxue , Zhu Zhaoqi , Liang Weidong , Li An
Published: September 2018

We report the synthesis of elastomeric conjugated microporous polymer nanotube aerogels with exceptional mechanical strength, excellent porous features and low thermal conductivity, which show great potential for solar steam generation.
Coral-like hierarchical carbon nanoarchitectures loaded with Rh- and Co-porphyrins as high-efficiency electrodes: effect of pore morphology on CO oxidation and oxygen reduction performance
Authors: Kubo Shiori , Endo Akira , Yamazaki Shin-ichi
Published: September 2018

Hierarchical coral-like carbon nanoarchitectures loaded with metalloporphyrin electrocatalysts reveal the pore morphology–electrochemical performance relationship and their superior performance in Pt-free, fuel cell-related reactions.
Molybdenum carbide nanoparticle decorated hierarchical tubular carbon superstructures with vertical nanosheet arrays for efficient hydrogen evolution
Authors: Xu Zhixiao , Zhang Guangfeng , Lu Chenbao , Tian Hao , Xi Xin , Liu Ruili , Wu Dongqing
Published: September 2018

With Mo2C nanoparticle decorated carbon tube-sheet superstructures, Mo2C/CTSSs manifest tunable catalytic activity towards hydrogen evolution reaction by changing the arrangement of carbon nanosheet arrays.
A porous Brønsted superacid as an efficient and durable solid catalyst
Authors: Sun Qi , Hu Kewei , Leng Kunyue , Yi Xianfeng , Aguila Briana , Sun Yinyong , Zheng Anmin , Meng Xiangju , Ma Shengqian , Xiao Feng-Shou
Published: September 2018

A porous superacid material with a high surface area and abundant accessible active sites is rationally designed, showing outstanding catalytic activities and durability in industrial chemical transformations.
Azasydnone – novel “green” building block for designing high energetic compounds
Authors: Dalinger Igor L. , Serushkina Olga V. , Muravyev Nikita V. , Meerov Dmitry B. , Miroshnichenko Evgeniy A. , Kon'kova Tatyana S. , Suponitsky Kyrill Yu. , Vener Mikhail V. , Sheremetev Aleksei B.
Published: September 2018

The azasydnone unit is a promising explosophoric block for future generations of highly thermostable and dense energetic materials.
Formation of morphologically confined nanospaces via self-assembly of graphene and nanospheres for selective separation of lithium
Authors: Zhao Yan , Zhou Chen , Wang Jiaqian , Liu Huawen , Xu Yanqing , Seo Jin Won , Shen Jiangnan , Gao Congjie , Van der Bruggen Bart
Published: September 2018

A novel organic–inorganic multilayer framework membrane was constructed by using graphene and sulfonated amino-polystyrene nanospheres (rGO@SAPS) through a chemical self-assembly process for selective separation of Li+ from saline lakes under an electric field.
Extension of indacenodithiophene backbone conjugation enables efficient asymmetric A–D–A type non-fullerene acceptors
Authors: Song Jiali , Li Chao , Ye Linglong , Koh Changwoo , Cai Yunhao , Wei Donghui , Woo Han Young , Sun Yanming
Published: September 2018

Three non-fullerene acceptors are developed by extending the conjugation of the indacenodithiophene (IDT) core for the fabrication of high-performance non-fullerene organic solar cells.
Shape- and size-controlled synthesis of Cu nanoparticles wrapped on RGO nanosheet catalyst and their outstanding stability and catalytic performance in the hydrogenation reaction of dimethyl oxalate
Authors: Abbas Mohamed , Chen Zheng , Chen Jiangang
Published: September 2018

A novel sonochemical approach was developed for the synthesis of morphology-controlled Cu NPs wrapped on RGO NSs catalysts and their superior stability and catalytic performance in dimethyl oxalate hydrogenation reaction.
Synthesis of N-doped carbon nanosheets with controllable porosity derived from bio-oil for high-performance supercapacitors
Authors: Wang Qun , Qin Bin , Zhang Xiaohua , Xie Xiaoling , Jin Li'e , Cao Qing
Published: September 2018

Nitrogen-doped porous carbon nanosheets were fabricated by carbonization and subsequent KOH activation of bio-oil derived polymers.
Screen printed carbon CsPbBr3 solar cells with high open-circuit photovoltage
Authors: Poli Isabella , Baker Jenny , McGettrick James , De Rossi Francesca , Eslava Salvador , Watson Trystan , Cameron Petra J.
Published: September 2018

Mesoporous carbon solar cells were prepared by infiltrating the porous substrate with inorganic CsPbBr3 solution. The films were post-annealed at different temperatures; post-annealing at 400 °C strongly enhances the open circuit voltage (1.44 V) and cell efficiency (8.2%).
A convenient and highly tunable way to n-type carbon nanotube thermoelectric composite film using common alkylammonium cationic surfactant
Authors: Cheng Xuejiang , Wang Xin , Chen Guangming
Published: September 2018

The corresponding TE device generates an open circuit voltage and an output power of 37.4 mV and 6.7 μW, respectively, at a temperature gradient of 80 K.
Washable textile-structured single-electrode triboelectric nanogenerator for self-powered wearable electronics
Authors: Ning Chuan , Tian Lan , Zhao Xinya , Xiang Shengxin , Tang Yingjie , Liang Erjun , Mao Yanchao
Published: September 2018

A washable textile-structured single-electrode triboelectric nanogenerators (TS-TENG) was successful developed. A stained TS-TENG can be easily and quickly cleaned by washing in water. When sewed on clothes, it can effectively harvest biomechanical energy from human motions.
Bioinspired microfibers for water collection
Authors: Tian Ye , Wang Liqiu
Published: September 2018

This review presents details of recent progress in bioinspired microfibers for water collection, including a systematic introduction to fiber types, fabrication methods, water-collecting mechanisms and behaviors.
Near-infrared electron acceptors based on terrylene diimides for organic solar cells
Authors: Liang Ningning , Sun Kai , Feng Jiajing , Chen Yu , Meng Dong , Jiang Wei , Li Yan , Hou Jianhui , Wang Zhaohui
Published: September 2018

The introduction of electron-donating groups into TDI broadens the absorption spectra and enhances the charge transport and photovoltaic performance.
Spiro-linked organic small molecules as hole-transport materials for perovskite solar cells
Authors: Gangala Sivakumar , Misra Rajneesh
Published: September 2018

Organic–inorganic halide perovskite solar cells (PSCs) have attracted great attention as an alternative renewable photovoltaic technology with a power conversion efficiency (PCE) > 22%, which is on par with established technologies.
Catechol/polyethyleneimine conversion coating with enhanced corrosion protection of magnesium alloys: potential applications for vascular implants
Authors: Zhang Hao , Xie Lingxia , Shen Xiaolong , Shang Tengda , Luo Rifang , Li Xin , You Tianxue , Wang Jin , Huang Nan , Wang Yunbing
Published: September 2018

A catechol/polyethyleneimine conversion coating on a MgZnMn alloy possessed good corrosion resistance. Heparin was further grafted on it and this showed the potential for surface modification of magnesium-based vascular implants.
Graphene oxide-gated mesoporous silica nanocontainers using aptamers for arsenite detection with glucometer readout
Authors: Zhou Qian , Tang Dianping
Published: September 2018

A newly portable detection sensing platform based on a graphene oxide (GO)-gated mesoporous silica nanocontainer (MSN) was designed for arsenite detection through the target-responsive release of glucose from the MSN with a glucometer readout.
Controlled shape deformation of bilayer films with tough adhesion between nanocomposite hydrogels and polymer substrates
Authors: Li Yu , Yang Jia , Yu Xianqiang , Sun Xiangbin , Chen Feng , Tang Ziqing , Zhu Lin , Qin Gang , Chen Qiang
Published: September 2018

A bilayer film prepared by one-step polymerization exhibits self-bending and self-helixing behaviours by adjusting its geometry parameters.
Microfluidic approach for the fabrication of cell-laden hollow fibers for endothelial barrier research
Authors: Nguyen Thi Phuong Thuy , Tran Buu Minh , Lee Nae Yoon
Published: September 2018

A simple fabrication approach to mimic the BBB in vitro using alginate hollow fibers functioning as the vasculature and co-culturing human endothelial cells with astrocytes inside a neurovascular scaffold.
Cation vacancy repair for the enhancement of orange-yellow luminescence in Sr9Mg1.5−xKx(PO4)7:Eu2+ phosphors
Authors: Yu Liping , Yan Huifang , Fan Yanting , Zhang Jinhui , Ma Zhongyun , Zhou Wenli , Chen Yan , Pan Fengjuan , Lian Shixun
Published: September 2018

A cation vacancy repair strategy successfully improves the photoluminescence of the Sr9Mg1.5(PO4)7:Eu2+ phosphor by K substituting Mg and Mg-vacancies.
Twisted dendrons for highly luminescent green emissive phosphorescent dendrimers
Authors: Stoltzfus Dani M. , Jiang Wei , Brewer Anthony M. , Burn Paul L.
Published: September 2018

A new class of twisted rigid biphenyl-based dendrons with t-butyl surface groups have been prepared and attached to a green emissive fac-tris(2-phenylpyridyl)iridium(iii) core.
A 3D antiferromagnetic ground state in a quasi-1D π-stacked charge-transfer system
Authors: Berlie Adam , Terry Ian , Szablewski Marek
Published: September 2018

With the rising interest in organic based materials for spintronic and multiferroic applications it is important to fully understand their electrical and magnetic properties and to identify correlations between their structural and physical attributes. In this work we look at a TCNQ based charge transfer compound to provide insight into the low temperature magnetism.
On the use of surfactants for improving nanofiller dispersion and piezoresistive response in stretchable polymer composites
Authors: Costa P. , Maceiras A. , San Sebastián M. , García-Astrain C. , Vilas J. L. , Lanceros-Mendez S.
Published: September 2018

Conducting polymer composites are increasingly investigated for the development of piezoresistive materials for sensor applications due to their outstanding electromechanical properties.
Using a facile processing method to facilitate charge extraction for polymer solar cells
Authors: Liu Chunyu , Zhang Dezhong , Tan Mingrui , Zhang Xinyuan , Li Zhiqi , Zhou Yue , Shen Liang , Ruan Shengping , Guo Wenbin
Published: September 2018

Improved performance of polymer solar cells is achieved by post-annealing the completed device and reducing the necessary thickness of the WO3 layer.
A highly efficient and thermally stable green phosphor (Lu2SrAl4SiO12:Ce3+) for full-spectrum white LEDs
Authors: Xiao Yu , Xiao Wenge , Zhang Liangliang , Hao Zhendong , Pan Guo-Hui , Yang Yang , Zhang Xia , Zhang Jiahua
Published: September 2018

Traditional phosphor-converted white LEDs suffer from the so-called blue-green cavity in their emission spectra.
Incipient spin–dipole coupling in a 1D helical-chain metal–organic hybrid
Authors: Basu Tathamay , Bloyet Clarisse , Rueff Jean-Michel , Caignaert Vincent , Pautrat Alain , Raveau Bernard , Rogez Guillaume , Jaffrès Paul-Alain
Published: September 2018

A metal–organic magnetic system with chiral structure is prone to ferroelectricity and magnetoelectric coupling.
Performance of cooperative multi‐hop cognitive radio networks with selective decode‐and‐forward relays
Authors: Boddapati Hari Krishna , Bhatnagar Manav R. , Prakriya Shankar
Published: September 2018

Multi‐hop relaying is used to extend the reach of wireless communication systems whereas cooperative relaying is used to improve the performance gain by exploiting the spatial diversity. In this study, the authors combine these two techniques to improve the range as well as the performance gain of cognitive radio networks (CRNs). Selective decode‐and‐forward relays are considered and two relay selection schemes are used to study the performance of multi‐hop CRNs over Rayleigh fading channels. The exact outage probability and throughput of the considered system are derived for both the schemes by considering the effect of both peak‐power and peak‐interference constraints. By using the derived outage probability, the diversity gains for both considered schemes are determined. Numerical results show that the outage probability monotonically improves, whereas the throughput has concave behaviour with respect to increasing number of relaying hops.
Dynamic power allocation scheme with clustering based on physical layer security
Authors: Liu Tianqi , Han Shuai , Meng Weixiao , Li Cheng , Peng Mugen
Published: September 2018

Achieving large confidential capacity under the wiretap channel model is a challenge due to the narrow modulation bandwidth and total transmission power constraints. The confidential capacity of a system can be improved through a non‐orthogonal multiple access technique that can obtain the highest transmission power in a downlink network. A clustering method is applied to network users who require data with similar contents. Based on the channel gain of each user, cluster heads are selected as agents for the corresponding clusters; then, the total transmission power is shared among the cluster heads. Before the power allocation process, the signal‐to‐interference‐plus‐noise ratio of the cluster heads is derived by considering clipping noise to ensure fairness. On this basis, an optimal power allocation scheme is proposed using Lagrangian dual theory. A case is presented to validate the performance of the proposed power allocation scheme. The comparison of the numerical results with those of other schemes shows that the proposed method achieves better performance regarding both secrecy sum capacity and outage probability.
Fixed‐time stabilisation for a class of high‐order non‐linear systems
Authors: Chen Chih‐Chiang , Sun Zong‐Yao
Published: September 2018

The problem of fixed‐time stabilisation for a class of high‐order non‐linear systems is studied. By introducing the manipulation of sign functions and revamping by adding a power integrator technique, a novel approach is proposed to construct a continuous stabiliser as well as a continuously differentiable Lyapunov function, which is crucial for proving fixed‐time stability. The novelty of this study is the development of a systematic design method that provides a delicate solution to the problem of fixed‐time stabilisation for high‐order non‐linear systems.
Consensus of uncertain parabolic PDE agents via adaptive unit‐vector control scheme
Authors: He Ping
Published: September 2018

This study focuses on the asymptotical consensus and synchronisation for coupled uncertain parabolic partial differential equation (PDE) agents with Neumann boundary condition (or Dirichlet boundary condition) and subject to a distributed disturbance whose norm is bounded by a constant which is not known a priori. Based on adaptive distributed unit‐vector control scheme and Lyapunov functional scheme, the distributed unit‐vector controller with adaptive gain is suggested to provide for the leader–following tracking of uncertain parabolic PDE agents. The suggested gradient‐based and mono‐directional gain adaptation provides convergence without requiring the knowledge of an upper bound to the norm of the external disturbance. The simulation is proposed to account for the effectiveness and robustness of the provided method.
Optimal transmission switching in the stochastic linearised SCUC for uncertainty management of the wind power generation and equipment failures
Authors: Nikoobakht Ahmad , Aghaei Jamshid , Mardaneh Mohammad
Published: September 2018

The following article published in IET Generation, Tranmission and Distribution, Nikoobakht, A., Aghaei, J., Mardenah, M., ‘Optimal transmission switching in the stochastic linearised SCUC for uncertainty management of the wind power generation and equipment failures’, Gener. Transm. Distrib., 2017, 11, (10), pp. 2664 – 2676, doi:10.1049/iet‐gtd.2016.1956, has been withdrawn by agreement between the authors, the Editors‐in‐Chief, Innocent Kamwa and Christian Rehtanz, and the Institution of Engineering and Technology. This is because the incorrect text was uploaded due to a technical error. The correct version has now been published as: Nikoobakht, A.,Aghaei, J., Mardenah, M. et al, 'Moving beyond the optimal transmission switching: stochastic linearised SCUC for the integration of wind power generation and equipment failures uncertainties', Gener. Transm. Distrib., 2018, 12, (15), pp. 3780 – 3792, 10.1049/iet‐gtd.2017.0617.
Spatial‐spectral classification of hyperspectral images: a deep learning framework with Markov Random fields based modelling
Authors: Qing Chunmei , Ruan Jiawei , Xu Xiangmin , Ren Jinchang , Zabalza Jaime
Published: September 2018

For the spatial‐spectral classification of hyperspectral images (HSIs), a deep learning framework is proposed in this study, which consists of convolutional neural networks (CNNs) and Markov random fields (MRFs). Firstly, a CNN model to learn the deep spectral feature from the HSI is built and the class posterior probability distribution is estimated. The CNN with a dropout layer can relieve the overfitting in classification. The CNN is utilised as a pixel‐classifier, so it only works in the spectral domain. Then, the spatial information will be encoded by MRF‐based multilevel logistic prior for regularising the classification. To derive the correlation of both spectral and spatial features for improving algorithm performance, the marginal probability distribution in HSI is learned using MRF‐based loopy belief propagation. In comparison with several state‐of‐the‐art approaches for data classification on three publicly available HSI datasets, experimental results have demonstrated the superior performance of the proposed methodology.
Wafer‐level fabrication of low power consumption integrated alcohol microsensor
Authors: Wang Hairong , Wang Mengya , Lei Weitao , Chen Xiaowei , Huang Hao , Wang Jiuhong
Published: September 2018

An integrated alcohol microgas sensor was designed and fabricated based on TiO2/SnO2 nanocomposites acting as a sensing layer and microheater providing working temperature. The stacked TiO2/SnO2 nanocomposites were prepared by magnetron sputtering. A unique suspended membrane consisting of Si3N4/SiO2/Si3N4/SiO2 four layers was prepared by different methods, respectively, and applied in microheater to support the electrodes and sensing layer for reducing power consumption. The fabrication process tackled the difficulty that the sensing layer preparation is incompatible with microelectromechanical systems micromachining technology and realised the mass production of the wafer‐level sensor chips with good consistency. The microalcohol sensors showed excellent response characteristics for alcohol (50–600 ppm) detection at low power consumption (39 mW).
An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations
Authors: Ezzeddine R. , Merle T. , Plez B. , Gebran M. , Thévenin F. , Van der Swaelmen M.
Published: September 2018

Context. Determination of high-precision abundances of late-type stars has been and always will be an important goal of spectroscopic studies, which requires accurate modeling of their stellar spectra with non-local thermodynamic equilibrium (NLTE) radiative transfer methods. This entails using up-to-date atomic data of the elements under study, which are still subject to large uncertainties.

Aims. We investigate the role of hydrogen collisions in NLTE spectral line synthesis, and introduce a new general empirical recipe to determine inelastic charge transfer (CT) and bound-bound hydrogen collisional rates. This recipe is based on fitting the energy functional dependence of published quantum collisional rate coefficients of several neutral elements (BeI, Na I, Mg I, Al I, Si Iand Ca I) using simple polynomial equations.

Methods. We perform thorough NLTE abundance calculation tests using our method for four different atoms, Na, Mg, Al and Si, for a broad range of stellar parameters. We then compare the results to calculations computed using the published quantum rates for all the corresponding elements. We also compare to results computed using excitation collisional rates via the commonly used Drawin equation for different fudge factors,SMH, applied.

Results. We demonstrate that our proposed method is able to reproduce the NLTE abundance corrections performed with the quantum rates for different spectral types and metallicities for representative Na Iand Al Ilines to within ≤0.05 dex and ≤0.03 dex, respectively. For Mg Iand Si Ilines, the method performs better for the cool giants and dwarfs, while larger discrepancies up to 0.2 dex could be obtained for some lines for the subgiants and warm dwarfs. We obtained larger NLTE correction differences between models incorporating Drawin rates relative to the quantum models by up to 0.4 dex. These large discrepancies are potentially due to ignoring either or both CT and ionization collisional processes by hydrogen in our Drawin models.

Conclusions. Our general empirical fitting method (EFM) for estimating hydrogen collision rates performs well in its ability to reproduce, within narrow uncertainties, the abundance corrections computed with models incorporating quantum collisional rates. It performs generally best for the cool and warm dwarfs, with slightly larger discrepancies obtained for the giants and subgiants. It could possibly be extended in the future to transitions of the same elements for which quantum calculations do not exist, or, in the absence of published quantum calculations, to other elements as well.
Dissecting cold gas in a high-redshift galaxy using a lensed background quasar
Authors: Krogager J.-K. , Noterdaeme P. , O’Meara J. M. , Fumagalli M. , Fynbo J. P. U. , Prochaska J. X. , Hennawi J. , Balashev S. , Courbin F. , Rafelski M. , Smette A. , Boissé P.
Published: September 2018

We present a study of cold gas absorption from a damped Lyman-α absorber (DLA) at redshift zabs = 1.946 toward two lensed images of the quasar J144254.78+405535.5 at redshift zQSO = 2.590. The physical separation of the two lines of sight at the absorber redshift is dabs = 0.7 kpc according to our lens model. We observe absorption lines from neutral carbon and H2 along both lines of sight, indicating that cold gas is present on scales larger than dabs. We measure the column densities of H I to be log N(HI) = 20.27 ± 0.02 and 20.34 ± 0.05 and those of H2 to be log N(H2) = 19.7 ± 0.1 and 19.9 ± 0.2. The metallicity inferred from sulphur is consistent with solar metallicity for both sightlines: [S/H]A = 0.0 ± 0.1 and [S/H]B = −0.1 ± 0.1. Based on the excitation of low rotational levels of H2, we constrain the temperature of the cold gas phase to be T = 109 ± 20 and T = 89 ± 25 K for the two lines of sight. From the relative excitation of fine-structure levels of C I, we constrain the hydrogen volumetric densities to lie in the range of 40 − 110 cm−3. Based on the ratio of observed column density and volumetric density, we infer the average individual “cloud” size along the line of sight to be l ≈ 0.1 pc. Using the transverse line-of-sight separation of 0.7 kpc together with the individual cloud size, we are able to place an upper limit to the volume filling factor of cold gas of fvol < 0.1%. Nonetheless, the projected covering fraction of cold gas must be large (close to unity) over scales of a few kpc in order to explain the presence of cold gas in both lines of sight. Compared to the typical extent of DLAs (∼10 − 30 kpc), this is consistent with the relative incidence rate of C I absorbers and DLAs.
Reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
Authors: Maíz Apellániz J. , Weiler M.
Published: September 2018

Context. The second data release (DR2) from the European Space Agency mission Gaia took place on April 2018. DR2 included photometry for more than 1.3 × 109 sources in the three bands G, GBP, and GRP. Even though the Gaia DR2 photometry is very precise, there are currently three alternative definitions of the sensitivity curves that show significative differences.

Aims. The aim of this paper is to improve the quality of the input calibration data to produce new compatible definitions of the G, GBP, and GRP bands and to identify the reasons for the discrepancies between previous definitions.

Methods. We have searched the Hubble Space Telescope (HST) archive for Space Telescope Imaging Spectrograph (STIS) spectra with G430L+G750L data obtained with wide apertures and combined them with the CALSPEC library to produce a high quality spectral energy distribution (SED) library of 122 stars with a broad range of colors, including three very red stars. This library defines new sensitivity curves for G, GBP, and GRP using a functional analytical formalism.

Results. The new sensitivity curves are significantly better than the two previous attempts we use as a reference, REV (Evans et al. 2018, A&A, 616, A4) and WEI (Weiler 2018, A&A, 616, A17). For G we confirm the existence of a systematic bias in magnitude and correct a color term present in REV. For GBP we confirm the need to define two magnitude ranges with different sensitivity curves and measure the cut between them at Gphot = 10.87 mag with a significant increase in precision. The new curves also fit the data better than either REV or WEI. For GRP, our new sensitivity curve fits the STIS spectra better and the differences with previous attempts reside in a systematic effect between ground-based and HST spectral libraries. Additional evidence from color–color diagrams indicate that the new sensitivity curve is more accurate. Nevertheless, there is still room for improvement in the accuracy of the sensitivity curves because of the current dearth of good-quality red calibrators: adding more to the sample should be a priority before Gaia data release 3 takes place.
Analysis of the structure of the frame of a trailer for transport of bales of compressed straw in the aspect of minimization of materials and energy consumption
Authors: Lodwik Dariusz , Pietrzyk Jerzy
Published: September 2018

The article presents the development of a structure model and numerical analysis of the trailer frame assembly intended for transporting bales of compressed straw, which may be a potential source of cheap and ecological energy. The aim of the analysis was to minimize the use of construction materials (reduction of the total weight), simplification of manufacturing technology, and thus energy savings in the production and operation. The aforementioned aspects also play a key role in environmental protection issues. The digital models of frame assemblies were made and subjected to static strength analysis. The structure was evaluated in terms of strength, based on the calculations made using the finite element method. The distribution of simulation parameters in the area of the tested structure made it possible to partially optimize the loadbearing system of the trailer, due to the adopted decision criterion in the form of reduction of the total weight and simplification of the structure, while meeting the limitations resulting from the values of stresses, displacements, safety factor in the admissible range. The material savings obtained for the optimal variant will result in simplification of manufacturing technology, energy savings and reduction of costs during production and operation.
Analysis of water flow velocity criteria for the selection of copper pipes on the example of production buildings
Authors: Żabnieńska–Góra Alina , Dudkiewicz Edyta
Published: September 2018

The article presents different aspects of application of copper pipes in water supply system, which have importance on properly work of installation and people health safety. The article analyses the water flow velocity criteria and their influence on the operation of the installation. It is particularly dangerous for copper pipes to exceed the permissible water flow velocity, as this results in corrosive processes. It is also not recommended that the flow velocity be too low, as it affects the development of biofilm and multiplication of bacteria.
Construction of a numerical model of suspension in a numerical simulation of sedimentation
Authors: Kołodziejczyk Krzysztof
Published: September 2018

Modeling of multiphase systems, which includes suspensions, is an issue that is continually developed. There are no procedures at the moment that would clearly determine the way in which suspension is defined in numerical simulations. The article presents an analysis of the selection of a numerical model and the definition of the suspension with a polydisperse particle composition.
Experimental research on the domestic ORC micro power plant with a commercial biomass boiler
Authors: Kaczmarczyk Tomasz , Żywica Grzegorz , Inhatowicz Eugeniusz
Published: September 2018

The purpose of the work was to experimentally evaluate the operation of the domestic ORC micro power plant that uses a commercial biomass boiler fueled with wood pellets. The boiler, with a maximum thermal power output of 45kWt, uses a heating jacket and thermal oil as a working medium. The prototypical domestic ORC micro power plant was equipped with a multistage radial-flow microturbine that can generate electricity (2.5kWe at a rotational speed of 24,000 rpm). The microturbine is a key component of the turbogenerator, which was manufactured in oilfree technology. The turbogenerator’s high-speed bearings are lubricated with the low-boiling medium’s vapour. The HFE7100 fluid was used as a working medium in the ORC installation. The paper discusses the thermodynamic conditions to be met for effective operation of the boiler and the results of experimental research. The operating characteristics of the ORC installation and the biomass boiler were presented. Problems that occurred while testing the micro-cogeneration power plant with the boiler and their impact on the electric and thermal efficiency of the cycle were discussed.
Liquidation of ammonia clouds using a mobile turbine rescue and firefighting system
Authors: Majder–Łopatka Małgorzata , Węsierski Tomasz
Published: September 2018

Given its extensive industrial use and chemical properties ammonia is a source of serious hazards in the event of its uncontrolled releases. The mobile turbine rescue and fire-fighting system (MTSRG), equipped with a special SO3-W aircraft turbine with 10 kN power and water efficiency of 6 m3/min, can be used to liquidate spatial gas clouds by diluting them with combustion gases and sorption on the surface of the produced water microdroplets. The publication presents calculations related to the effectiveness of the system during the uncontrolled release of ammonia from a pressure vessel. To estimate the performance of this system, use was made of water stream droplet size research, kinetics studies of ammonia sorption, SO3-W turbine parameters at a safe working distance, as well as results of ammonia concentration simulation using the ALOHA program. A combined simulation carried out for a rupture of DN100 pipe supplying liquid ammonia to spherical tank with a diameter of 16.6 m and filled in 70% showed that it is theoretically possible to reduce the ammonia concentration by as much as 95.75% while the vehicle is operating at a working distance of 60 meters from the rupture. The exhaust gases together with the entrained air contribute mainly to the reduction of the concentration of ammonia through the mechanism of dilution (91.6%). Water mist generated by the vehicle is theoretically responsible for the reduction of ammonia concentration by only 4.15%.
Smog - Poland’s pressing problem. Anti-smog technologies
Authors: Kiciński Jan
Published: September 2018

The article also presents the situation of the Polish power engineering against the background of global trends, as well as proposals for solving the smog problem using anti-smog technologies developed at the Institute of Fluid-Flow Machinery of the Polish Academy of Sciences in Gdańsk (IMP PAN) and by launching a pilot project that will cover 1,000 households equipped with these technologies. The author and his closest coworkers recommend equipping boilers, including both older and newer ones, with low-power electrostatic precipitators. In this way, one can burn lowquality fuels while keeping the emission of airborne dust at a low level. It is a quick and not pricey solution to the smog problem.
The analysis of “more electric engine” technology to improve the environmental performance of aircraft jet engine
Authors: Henzel Maciej , Falkowski Krzysztof , Olejnik Aleksander
Published: September 2018

In aviation, there is now a dynamic development of aircraft equipment related to the implementation of “more electric aircraft” technology. This concept offers the ability to improve the use of on-board systems, e.g. environmental operating conditions of aircraft jet engine. This technology is named “more electric engine”. It allows the use of magnetic levitation technology at engine turbine shaft bearing. The development of this technology relates to the dynamic change of electronic power systems for civilian transport aircraft, the use of adaptive control methods and new materials in aviation technology. All technologies are improved the environmental operating conditions of the on-board system, e.g. operational flexibility, technological potential growth. [1] In the paper will be presented the TS-21 aircraft jet engine. This engine is modernized in the Jet Engine Laboratory of the Military University of Technology. The paper is presented a digital engine control system, the operating parameters acquisition system and magnetic bearing system. It is described the concept of active magnetic suspension of the turbine engine shaft support. The magnetic suspension technology allows eliminate mechanical bearing arrangements with an oil installation, friction forces and classical, mechanical bearings. The paper contains the simulation and experimental results of a modernized jet engine TS-21.
Kurzschaft, Geradschaft, anatomischer Schaft: freie Wahl oder Empfehlungen?
Authors: von Lewinski Gabriela
Published: September 2018

Die Ziele der Hüftendoprothetik sind vielfältig. Neben dem Hauptziel der Schmerzfreiheit spielt vor allem die Primär- und langfristige Stabilität, die Rekonstruktion der Anatomie und die Wiedererlangung der Funktion eine entscheidende Rolle. Eine Vielzahl von Prothesentypen, die unterschiedliche Verankerungskonzepte verfolgen, ist auf dem Markt. Der folgende Beitrag will versuchen, die Unterschiede zwischen den Schafttypen aufzuzeigen und damit eine Entscheidungshilfe bei der Wahl zwischen den einzelnen Schafttypen zu geben. Der Geradschaft ist symmetrisch und verankert sich in Abhängigkeit von seiner Form sowohl meta- als auch diaphysär. Je weiter die Verankerung im diaphysären Bereich angesiedelt ist, umso größer ist die Gefahr des Stress-Shieldings. Der anatomische Schaft ist ein Geradschaft, der zusätzlich das Ziel hat, dem Femurmarkraum volumetrisch zu folgen bzw. diesen in der Form des Schaftkörpers als Gegenstück abzubilden. Damit soll auch die natürliche Krafteinleitung wieder hergestellt werden. Diese Passgenauigkeit hat aber auch ihre Grenzen, denn Femora weisen anatomische Unterschiede auf. Kurzschäfte zeichnen sich primär dadurch aus, dass sie eine geringere Länge aufweisen als die Standardschäfte. Wie die Geradschäfte unterscheiden sich die Kurzschäfte in ihrem Design und damit in ihren Verankerungshöhen, was wiederum Auswirkungen auf die Biomechanik hat. Neben den verschiedenen Schafttypen gilt es, die unterschiedlichen Morphologien zu differenzieren. Vor allem bei jüngeren Patienten findet man eine sekundäre Koxarthrose infolge von kongenitalen Hüftdysplasien, Morbus Perthes, Epiphysiolysis capitis femoris oder posttraumatischen Veränderungen. Auch ohne Voroperationen oder angeborene Deformitäten zeigen sich verschieden Formtypen des Femurs auch bei älteren Patienten, wie z. B. die Varianten nach Dorr. Der Operateur sollte daher bei der Schaftwahl sowohl biomechanische Aspekte als auch patientenspezifische Faktoren berücksichtigen, um den optimalen Schafttyp für den Patienten zu finden. Dabei sollten Primär- und Langzeitstabilität im Fokus stehen.
Synthesizing new glass 40P2O5 – 50BaO - 2.5Na2O – 2.5MgO - 5TiO2 for the application in high radiation environmental dosimetry
Authors: Abdelhalim Mohamed Anwar K. , Al-Ayed Mohammed Suliman , Al-Shamrani Bandar Mora
Published: September 2018

This paper aimed to present the thermoluminescence (TL) characteristics of phosphorus pentoxide (P2O5) nanopowders as a glass former, modified with barium oxide (BaO) glass, the mixture was activated with titanium oxide (TiO2), and then co-activated with magnesium oxide (MgO) and sodium oxide (NaO). The glass was arranged into five different samples depending on the activator concentration and co-activator with the glass matrix 40 P2O5 - 50 BaO. The sample glass 40P2O5 – 50BaO - 2.5Na2O – 2.5MgO - 5TiO2 confirmed and proved the following properties: simple, reasonable, modest way of synthesis, losing nearly about 18.57% from its TL information in 10 days, apparent glow curve shape, linear response, less fading, and high Zeff value. Thus, this new formed kind of glass might play a crucial role especially in the field of high radiation environmental dosimetry.