bluuebunny/crossref_metadata_2025 huggingface dataset:
Semiconductor quantum dots reveal dipolar coupling from exciton to ligand vibration
Authors: Noblet T. , Dreesen L. , Boujday S. , Méthivier C. , Busson B. , Tadjeddine A. , Humbert C.
Published: October 2018

Within semiconductor quantum dots (QDs), exciton recombination processes are noteworthy for depending on the nature of surface coordination and nanocrystal/ligand bonding. The influence of the molecular surroundings on QDs optoelectronic properties is therefore intensively studied. Here, from the converse point of view, we analyse and model the influence of QDs optoelectronic properties on their ligands. As revealed by sum-frequency generation spectroscopy, the vibrational structure of ligands is critically correlated to QDs electronic structure when these are pumped into their excitonic states. Given the different hypotheses commonly put forward, such a correlation is expected to derive from either a direct overlap between the electronic wavefunctions, a charge transfer, or an energy transfer. Assuming that the polarizability of ligands is subordinate to the local electric field induced by excitons through dipolar interaction, our classical model based on nonlinear optics unambiguously supports the latter hypothesis.
Tunable electronic structure and topological properties of LnPn (Ln=Ce, Pr, Sm, Gd, Yb; Pn=Sb, Bi)
Authors: Duan Xu , Wu Fan , Chen Jia , Zhang Peiran , Liu Yang , Yuan Huiqiu , Cao Chao
Published: October 2018

Recently, the rare-earth monopnictide compounds LnPn have attracted considerable attention in condensed matter physics studies due to their possible topological properties. We have performed systematic first principles study of the electronic structure and band topology properties of LnPn (Ln=Ce, Pr, Sm, Gd, Yb; Pn=Sb, Bi). Assuming the f-electrons are well localized in these materials, both hybrid functional and modified Becke–Johnson calculations yield electronic structure in good agreement with experimental observations, while generalized gradient approximation calculations severely overestimate the band inversions. From Ce to Yb, a systematic reduction of band inversion with respect to the increasing Ln atomic number is observed, and $${\cal Z}_2$$

Z

2

for CePn and YbPn are [1;000] and [0;000], respectively. In both hybrid functional and modified Becke–Johns calculations, a topologically non-trivial to trivial transition is expected around SmSb for the antimonides and around DyBi for the bismuthides. Such variation is related with lanthanide contraction, but is different from simple pressure effects.
Correction: Electrochemical microfluidics techniques for heavy metal ion detection
Authors: Li Su , Zhang Chencheng , Wang Shengnan , Liu Qing , Feng Huanhuan , Ma Xing , Guo Jinhong
Published: October 2018

Correction for ‘Electrochemical microfluidics techniques for heavy metal ion detection’ by Su Li et al., Analyst, 2018, 143, 4230–4246.
Determination of thermal degradants in e-cigarette fluid via direct sample introduction (DSI) gas chromatography-tandem mass spectrometry
Authors: Bisceglia Kevin J. , Caravan Sahar , Rogers Keegan , Huang Ling
Published: October 2018

Electronic cigarettes (EC) and other electronic nicotine delivery systems (ENDS) have recently become popular choices for nicotine consumption due to the lower perceived harm compared to conventional tobacco products.
Ratiometric RNA aptamer/fluorophore complex for RNA synthesis detection
Authors: Guo Hui , Fan Mengyue , Li Zengjin , Tang Wei , Duan Xinrui
Published: October 2018

Ratiometric RNA aptamer–fluorophore complex, Spinach2/DFHBI–CM, for quantifying the in vitro synthesis of RNA.
Novel AIEgens with a 3,5-dibromobenzaldehyde skeleton: molecular design, synthesis, tunable emission and detection application
Authors: Kuang Yunsuo , Chen Linfeng , Tian Xike , Li Yong , Lu Liqiang , Yang Chao , Zhou Zhaoxin , Nie Yulun
Published: October 2018

In this study, three novel fluorophores with aggregation-induced emission effects (AIE) have been synthesized by a new strategy that uses the non-AIE active compound 3,5-dibromobenzaldehyde (DBB) as a core (stator).
A potentiometric aptasensor for carcinoembryonic antigen (CEA) on graphene oxide nanosheets using catalytic recycling of DNase I with signal amplification
Authors: Hong Zhilin , Chen Genwang , Yu Shaoyang , Huang Rongfu , Fan Chunmei
Published: October 2018

A label-free potentiometric aptasensing platform was designed for detection of carcinoembryonic antigen on a graphene oxide-modified electrode coupling with target recycling-assisted signal amplification.
Conjugation of carboxymethyl cellulose and dopamine for cell sheet harvesting
Authors: Hong Soyoung , Sunwoo Jeong Hey , Kim Ji Seon , Tchah Hungwon , Hwang Changmo
Published: October 2018

This manuscript focuses on the cell sheet preparation methodology with the conjugation of carboxymethylcellulose (CMC) and dopamine (DA).
A new amphiphilic pillar[5]arene: synthesis and controllable self-assembly in water and application in white-light-emitting systems
Authors: Sun Siyu , Geng Meng , Huang Ling , Chen Yanmei , Cen Moupan , Lu Dou , Wang Aiwei , Wang Yang , Shi Yujun , Yao Yong
Published: October 2018

A new type of amphiphilic pillar[5]arene with excellent surface activity was designed and synthesized successfully. Interestingly, this pillar[5]arene shows controllable self-assembly behaviour in water and can be applied in white-light-emitting systems.
Towards a dissociative SPC-like water model II. The impact of Lennard-Jones and Buckingham non-coulombic forces
Authors: Hofer Thomas S. , Wiedemair Martin J.
Published: October 2018

The dissociative water potential by Garofalini and coworkers has been re-formulated in the framework of the widely employed Lennard-Jones and Buckingham potentials, enhancing the transferability of the model to third party simulation programs.
Self-adaptive multiscaling algorithm for efficient simulations of many-protein systems in crowded conditions
Authors: Hassan Sergio A.
Published: October 2018

A method is described for the efficient simulation of multiprotein systems in crowded aqueous solutions.
Lab-simulated downhole leaching of formaldehyde from proppants by high performance liquid chromatography (HPLC), headspace gas chromatography-vacuum ultraviolet (HS-GC-VUV) spectroscopy, and headspace gas chromatography-mass spectrometry (HS-GC-MS)
Authors: Schenk Jamie , Carlton Doug D. , Smuts Jonathan , Cochran Jack , Shear Lindsey , Hanna Ty , Durham Danny , Cooper Cal , Schug Kevin A.
Published: October 2018

Different methods to analyze formaldehyde from proppants was investigated under lab-simulated downhole conditions.
Cyano-rich mesoporous carbon nitride nanospheres for visible-light-driven photocatalytic degradation of pollutants
Authors: Chen Chang-Bin , Li Chen-Xuan , Zhang Ying-Jie , Wang Yun-Jie , Lu Jia-Yuan , Liu Hou-Qi , Li Wen-Wei
Published: October 2018

Visible-light-responsive photocatalysis offers exciting opportunities for sustainable environmental pollution control, but the unsatisfactory photoactivity of the existing photocatalysts impedes its practical application.
Digital polymerase chain reaction technology – recent advances and future perspectives
Authors: Sreejith Kamalalayam Rajan , Ooi Chin Hong , Jin Jing , Dao Dzung Viet , Nguyen Nam-Trung
Published: October 2018

We critically evaluate the state of the art of the development of digital polymerase chain reaction systems.
Inhibition of amyloid fibril formation of β-lactoglobulin by natural and synthetic curcuminoids
Authors: Maity Sanhita , Pal Sampa , Sardar Subrata , Sepay Nayim , Parvej Hasan , Begum Shahnaz , Dalui Ramkrishna , Das Niloy , Pradhan Anirban , Halder Umesh Chandra
Published: October 2018

The aggregation of proteins has been associated with several aspects of daily life, including food processing, blood coagulation and many neurodegenerative infections.
Catalytic study on thermal decomposition of Cu-en/(AP, CL-20, RDX and HMX) composite microspheres prepared by spray drying
Authors: Song Nai-Meng , Yang Li , Han Ji-Min , Liu Jian-Chao , Zhang Guo-Ying , Gao Hong-Xu
Published: October 2018

This paper mainly describes a spray drying method for the preparation of a variety of composite microspheres of energetic materials, including AP, RDX, β-HMX, and ε-CL-20, which are commonly used in composite modified double base propellants.
Fe-Doped ZnO nanoparticle toxicity: assessment by a new generation of nanodescriptors
Authors: Burk Jaanus , Sikk Lauri , Burk Peeter , Manshian Bella B. , Soenen Stefaan J. , Scott-Fordsmand Janeck J. , Tamm Tarmo , Tämm Kaido
Published: October 2018

Toxicity and cancer-killing potency of Fe-doped ZnO nanoparticles can be reliably modelled using atomistic nanodescriptors.
The potential of magnetic hyperthermia for triggering the differentiation of cancer cells
Authors: Moise Sandhya , Byrne James M. , El Haj Alicia J. , Telling Neil D.
Published: October 2018

In addition to causing cell death, magnetic hyperthermia triggers the onset of differentiation in osteosarcoma cells that survive magnetic hyperthermia treatment.
Moiré-templated strain patterning in transition-metal dichalcogenides and application in twisted bilayer MoS2
Authors: Zhu Shuze , Johnson Harley T.
Published: October 2018

A general Moiré-templated nanoscale morphology engineering method.
Boron based nanosheets as reducing templates in aqueous solutions: towards novel nanohybrids with gold nanoparticles and graphene
Authors: James Asha Liza , Khandelwal Shikha , Dutta Arnab , Jasuja Kabeer
Published: October 2018

Boron based nanosheets act as chemically reducing templates in aqueous solution to form mixed-dimensional heterostructures with gold nanoparticles and graphene.
Surface conversion of ZnO nanorods to ZIF-8 to suppress surface defects for a visible-blind UV photodetector
Authors: Kim Hyeonghun , Kim Woochul , Park Jiyoon , Lim Namsoo , Lee Ryeri , Cho Sung Jun , Kumaresan Yogeenth , Oh Myoung-Kyu , Jung Gun Young
Published: October 2018

A remarkably sensitive and visible-blind ultraviolet photodetector based on ZnO nanorods is demonstrated through ZnO surface conversion into ZIF-8.
Oxygen vacancy enriched hollow cobaltosic oxide frames with ultrathin walls for efficient energy storage and biosensing
Authors: Hua Li , Hui Zengyu , Sun Yue , Zhao Xi , Xu Hai , Gong Yujiao , Chen Ruyi , Yu Chenyang , Zhou Jinyuan , Sun Gengzhi , Huang Wei
Published: October 2018

Hierarchical cobaltosic oxide frames with enriched oxygen vacancies and finely tuned nanostructures are prepared by one-step calcination in air.
Non-Mie optical resonances in anisotropic biomineral nanoparticles
Authors: Noskov Roman E. , Shishkin Ivan I. , Barhom Hani , Ginzburg Pavel
Published: October 2018

A novel famility of optical resonances driven by Cartesian anisotropy is demonstrated in calcite and vaterite nanoparticles.
An efficient room-temperature synthesis of highly phosphorescent styrenic Pt(ii) complexes and their polymerization by ATRP
Authors: Mayder Don M. , Thompson Kyle A. , Christopherson Cheyenne J. , Paisley Nathan R. , Hudson Zachary M.
Published: October 2018

Cyclometalated Pt(ii) complexes are among the most efficient phosphorescent materials, yet their incorporation into polymers remains rare.
Identification of pathogenic bacteria in complex samples using a smartphone based fluorescence microscope
Authors: Müller Vilhelm , Sousa José M. , Ceylan Koydemir Hatice , Veli Muhammed , Tseng Derek , Cerqueira Laura , Ozcan Aydogan , Azevedo Nuno F. , Westerlund Fredrik
Published: October 2018

A smartphone-based fluorescence microscope for detection of bacteria in complex samples using a species-specific peptide nucleic acid probe.
Comparative analysis on adsorption properties and mechanisms of nitrate and phosphate by modified corn stalks
Authors: Wang Lin , Xu Zhizhi , Fu Yongsheng , Chen Yangwu , Pan Zhicheng , Wang Rui , Tan Zhouliang
Published: October 2018

We compare and analyze the different properties and mechanisms of MCS on nitrate and phosphate.
Molecular keypad controlled circuit for Ce(iii) and NO3− ions recognition by μw synthesized silicon-embedded organic luminescent sensor
Authors: Kaur Navpreet , Singh Gurjaspreet , Singh Jasbhinder , Singh Akshpreet , Satija Pinky , Kaur Gurpreet , Singh Jandeep
Published: October 2018

This report demonstrates the mimicking of an electronic circuit diagram towards Ce(iii) ion sensing response supported by molecular keypads.
A targeted metabolomic protocol for quantitative analysis of volatile organic compounds in urine of children with celiac disease
Authors: Drabińska Natalia , Azeem Hafiz Abdul , Krupa-Kozak Urszula
Published: October 2018

An SPME-GCMS method was optimized for quantitative analysis of 15 urinary biomarkers in celiac disease children using multivariate design of experiment.
Study on the growth rate of natural gas hydrate in water-in-oil emulsion system using a high-pressure flow loop
Authors: Lv Xiaofang , Shi Bohui , Zhou Shidong , Peng Haoping , Lei Yun , Yu Pengfei
Published: October 2018

Hydrate slurry transport technology in deep-water pipelines has become a focal point among worldwide researches, due to its high economic efficiency.
Stabilization of beryllium-containing planar pentacoordinate carbon species through attaching hydrogen atoms
Authors: Zhao Xue-Feng , Bian Jian-Hong , Huang Fang , Yuan Caixia , Wang Qiang , Liu Ping , Li Debao , Wang Xiaotai , Wu Yan-Bo
Published: October 2018

The destabilization issues, like high charges, small HOMO–LUMO gaps, and dispersed MOs, etc. can be eliminated via attaching hydrogen atoms.
Influence of structure–activity relationships on through-space intervalence charge transfer in metal–organic frameworks with cofacial redox-active units
Authors: Ding Bowen , Hua Carol , Kepert Cameron J. , D'Alessandro Deanna M.
Published: October 2018

Metal–organic frameworks incorporating cofacially-aligned redox-active ligands exhibit through-space intervalence charge transfer phenomena.
Z-scheme solar water splitting via self-assembly of photosystem I-catalyst hybrids in thylakoid membranes
Authors: Utschig Lisa M. , Soltau Sarah R. , Mulfort Karen L. , Niklas Jens , Poluektov Oleg G.
Published: October 2018

A new photocatalytic system composed of abiotic catalyst and native photosynthetic membranes produces hydrogen and oxygen directly from water using sunlight.
A copper-catalyzed double coupling enables a 3-step synthesis of the quassinoid core architecture
Authors: Condakes Matthew L. , Rosen Rachel Z. , Harwood Stephen J. , Maimone Thomas J.
Published: October 2018

A cross coupling/SN2′ tandem reaction is described to construct the polycyclic core architecture of the quassinoids, a fascinating class of degraded triterpenes with potent anticancer activity.
Mechano-responsive circularly polarized luminescence of organic solid-state chiral emitters
Authors: Louis Marine , Sethy Ramarani , Kumar Jatish , Katao Shouhei , Guillot Régis , Nakashima Takuya , Allain Clémence , Kawai Tsuyoshi , Métivier Rémi
Published: October 2018

Mechano-CPL effect: chiral difluoro-boron β-diketonate complexes show concomitant changes of emission color as well as solid state chiroptical properties upon mechanical stimulation.
Physical crosslinking of hyaluronic acid in the presence of phospholipids in an aqueous nano-environment
Authors: Bełdowski Piotr , Weber Piotr , Dėdinaitė Andra , Claesson Per M. , Gadomski Adam
Published: October 2018

The presence of phospholipids and longer hyaluronic acid chains promote long-lasting networks.
Adhesion-based sorting of blood cells: an adhesive dynamics simulation study
Authors: Dasanna Anil K. , Schwarz Ulrich S.
Published: October 2018

Both leukocytes and malaria-infected red blood cells can be sorted by adhesive stripe assays with optimized inclination angles.
Catalytic and networking effects of carbon black on the kinetics and conversion of sulfur vulcanization in styrene butadiene rubber
Authors: Hosseini Seyed Mostaffa , Razzaghi-Kashani Mehdi
Published: October 2018

The physical restriction exerted on the entrapped rubber by the carbon black network reduces the required kinetic energy of macro-radicals to collide and form the cross-links.
Multi-layered hybrid perovskites templated with carbazole derivatives: optical properties, enhanced moisture stability and solar cell characteristics
Authors: Herckens Roald , Van Gompel Wouter T. M. , Song Wenya , Gélvez-Rueda María C. , Maufort Arthur , Ruttens Bart , D'Haen Jan , Grozema Ferdinand C. , Aernouts Tom , Lutsen Laurence , Vanderzande Dirk
Published: October 2018

Novel multi-layered hybrid perovskites containing carbazole derivatives show superior environmental stability, maintaining solar cell power conversion efficiency.
Two-dimensional Pd3P2S8 semiconductors as photocatalysts for the solar-driven oxygen evolution reaction: a theoretical investigation
Authors: Jing Yu , Heine Thomas
Published: October 2018

On the basis of first principles calculations, we propose Pd3P2S8 monolayer and bilayer, two-dimensional semiconductors, whose layered bulk parent crystals are experimentally reported, as promising photocatalysts for the solar-driven oxygen evolution reaction.
A novel approach for facilitating the targeted synthesis of silicoaluminophosphates
Authors: Yan Nana , Wang Lei , Liu Xiaona , Wu Pengfei , Sun Tantan , Xu Shutao , Han Jingfeng , Guo Peng , Tian Peng , Liu Zhongmin
Published: October 2018

“RSS” inspired by Rietveld refinement is proposed to facilitate the targeted synthesis of SAPO RHO-type DNL-6 and LTA-type SAPO-42.
Diameter dependent transparency changes of nanorod-based large-area flexible smart window devices
Authors: Ren Fuqiang , Huang Shengyun , Yang Fan , Yurtsever Aycan , Ma Dongling
Published: October 2018

Flexible SPDs achieve optical modulation as high as 73.7% and bending capability up to ∼180 degrees without any structural damage.
Enhanced thermoelectric performance in topological crystalline insulator n-type Pb0.6Sn0.4Te by simultaneous tuning of the band gap and chemical potential
Authors: Roychowdhury Subhajit , Dutta Moinak , Biswas Kanishka
Published: October 2018

Iodine doping perturbs the local mirror symmetry and widens the band gap in TCI, Pb0.60Sn0.40Te, making it a promising n-type thermoelectric material.
Localized effect of PbI2 excess in perovskite solar cells probed by high-resolution chemical–optoelectronic mapping
Authors: Barbé Jérémy , Newman Michael , Lilliu Samuele , Kumar Vikas , Lee Harrison Ka Hin , Charbonneau Cécile , Rodenburg Cornelia , Lidzey David , Tsoi Wing Chung
Published: October 2018

Laser irradiation is used to generate PbI2 as a passivation technique for perovskite solar cells.
Facile preparation of biocompatible Ti2O3 nanoparticles for second near-infrared window photothermal therapy
Authors: Zeng Jinhua , Wu Ming , Lan Shanyou , Li Jiong , Zhang Xiaolong , Liu Jingfeng , Liu Xiaolong , Wei Zuwu , Zeng Yongyi
Published: October 2018

NIR-II photothermal therapy (PTT) agents of Ti2O3 nanoparticles have been developed.
Linker chemistry dictates the delivery of a phototoxic organometallic rhenium(i) complex to human cervical cancer cells from core crosslinked star polymer nanoparticles
Authors: Yu Sul Hwa , Patra Malay , Ferrari Stefano , Ramirez Garcia Paulina , Veldhuis Nicholas A. , Kaminskas Lisa M. , Graham Bim , Quinn John F. , Whittaker Michael R. , Gasser Gilles , Davis Thomas P.
Published: October 2018

Release of a photoactive Re(i) complex from a polymer star via ketimine linkages gives improved phototoxicity.
Dual antibacterial behavior of a curcumin–upconversion photodynamic nanosystem for efficient eradication of drug-resistant bacteria in a deep joint infection
Authors: Liu Jiangjun , Yu Meng , Zeng Guobo , Cao Jie , Wang Yuanhe , Ding Tao , Yang Xu , Sun Kang , Parvizi Javad , Tian Shaoqi
Published: October 2018

The curcumin–upconversion photodynamic nanosystem exhibits dual antibacterial behavior for MRSA-induced periprosthetic joint infection under NIR irradiation.
Transparent luminescent nanopaper based on g-C3N4 nanosheet grafted oxidized cellulose nanofibrils with excellent thermal and mechanical properties
Authors: Mu Lan , Shi Liyi , Wang Yanqin , Zhou Qianfan , Ye Jinhong , Feng Xin
Published: October 2018

Transparent hybrid nanopaper based on g-C3N4 nanosheets and oxidized cellulose nanofibrils exhibits blue fluorescence under UV illumination.
Quasimolecular complexes in the CuxTiSe2−ySy intercalation compound
Authors: Shkvarin A. S. , Merentsov A. I. , Titov A. A. , Yarmoshenko Yu. M. , Shkvarina E. G. , Píš I. , Nappini S. , Titov A. N.
Published: October 2018

The Cu intercalation into Ti(Se1−ySy)2 leads to the formation of the Cu–S quasimolecules, which are responsible for the charge-density-wave state suppression.
Ultrasmall 2D NbSe2 based quantum dots used for low threshold ultrafast lasers
Authors: Shi Yihuan , Long Hui , Liu Shunxiang , Tsang Yuen Hong , Wen Qiao
Published: October 2018

Low threshold ultrafast fiber lasers in 1.5 based NbSe2 quantum dots saturable absorbers have been successfully fabricated and investigated.
Broad-band emission of A3B′B′′2O9complex perovskites (A = Ba, Sr; B′ = Zn; B′′ = Ta, Nb) realized by structural variations of the B site order–disorder
Authors: Li Xiaohui , Zhou Lei , Dramićanin Miroslav D. , Tang Qiang , Jing Xiping , Shi Jianxin , Xu Yiqin , Wu Mingmei
Published: October 2018

A single-component white phosphor with a high color rendering index (Ra= 82.2) and good color stability was achieved by nonequivalent doping as the proposed strategy, which induces B-site disordering and compensates the intrinsic oxygen defects of SZN.
Non-fullerene acceptor engineering with three-dimensional thiophene/selenophene-annulated perylene diimides for high performance polymer solar cells
Authors: Li Gang , Wang Shuaihua , Liu Tao , Hao Pin , Liu Zhenhua , Li Fengting , Yang Lian-Ming , Zhang Yu , Li Dandan , Yang Shufan , Zhao Jianfeng , Li Jiewei , Yan He , Tang Bo
Published: October 2018

High efficiencies of 6.85% and 7.63% are obtained in non-fullerene OSCs using TPE-PDI4-S/TPE-PDI4-Se as the acceptors and PBDB-T1 as the donor.
Estrogen ameliorates allergic airway inflammation by regulating activation of NLRP3 in mice
Authors: Cheng Cheng , Wu Huimei , Wang Muzi , Wang Lixia , Zou Hongyun , Li Shuai , Liu Rongyu
Published: October 2018

Background: Estrogen has been suggested to play a protective role against airway inflammations, such as asthma. In these processes, the inflammasome nucleotide-binding oligomerization domain, leucine-rich repeat and pyrin domain containing 3 (NLRP3) partly accounts for the activation of pro-inflammatory factors. The aim of the present study was to investigate whether NLRP3 was involved in the protective effect of estrogen against allergic airway inflammation. Methods: An ovariectomy was performed on female C57BL/6 mice; some were sham-operated (sham). We then sensitized and challenged them with ovalbumin (OVA) to establish an airway inflammation model. Meanwhile, some mice were treated with 17β-estradiol (E2) for 28 days. Results: The expression of NLRP3 inflammasome and its downstream products, caspase-1 and the pro-inflammatory cytokine interleukin (IL)-1β (IL-1β), increased concomitantly with OVA-challenged airway inflammation and decreased with the expression of estrogen receptor β (ERβ). In addition, treating ovariectomized (OVX) mice with E2 dramatically ameliorated airway inflammation via such mechanisms as leukocyte recruitment, mucus production, and secretion of pro-inflammatory cytokines other than IL-18 in bronchoalveolar lavage (BAL) fluid (BALF). Furthermore, E2 suppressed both the mRNA expression and protein expression of NLRP3, caspase-1, and IL-1β. In summary, our study showed that NLRP3 inflammasome activation and pro-inflammatory cytokine production markedly increased in OVA-induced airway inflammation, and E2 effectively abrogated such inflammation by regulating the activation of NLRP3.
Binary classification model based on machine learning algorithm for the DC serial arc detection in electric vehicle battery system
Authors: Xia Kun , Guo Haotian , He Sheng , Yu Wei , Xu Jingjun , Dong Hui
Published: October 2018

Direct current (DC) serial arc faults usually occur in the damaged insulation lines or line connections, which will cause serious accidents such as fires and explosions. With the rapid increase of electric vehicles, DC serial arc faults are more and more dangerous to battery system. Therefore, a binary classification model based on machine learning algorithm was proposed to detect DC serial arc faults effectively in this study. It was optimised according to the characteristic signals of the arc to be satisfied with different loads for higher detection accuracy and robustness. In the simulative experiments for the power system electric vehicle, while the loads changing to the motor, the resistor or the inverter, it will all reach a highly successful detection rate, respectively.
Optimal distribution system restoration using PHEVs
Authors: Sun Wei , Kadel Nemica , Alvarez‐Fernandez Inalvis , Nejad Reza Roofegari , Golshani Amir
Published: October 2018

Power outages cost billions of dollars every year and jeopardise the lives of hospital patients. Traditionally, power distribution system takes a long time to recover after a major blackout, due to its top‐down operation strategy. New technologies in modern distribution systems bring opportunities and challenges to distribution system restoration. As fast response energy resources, plug‐in hybrid electric vehicles (PHEVs) can accelerate the load pickup by compensating the imbalance between available generation and distribution system load. This study provides a bottom‐up restoration strategy to use PHEVs for reliable load pickup and faster restoration process. The optimisation problem of finding load pickup sequence to maximise restored energy is formulated as a mixed integer linear programming (MILP) problem. Moreover, the coordination between transmission and distribution restoration is developed to efficiently restore the entire system back to normal operating conditions. Simulation results on one 100‐feeder test system demonstrate the efficiency of MILP‐based restoration strategy and the benefit from PHEVs to restore more energy in given restoration time. The proposed restoration strategy has great potential to facilitate system operators to achieve efficient system restoration plans. It also provides incentives to deploy a large amount of PHEVs to improve system resiliency.
Confirmation of the radial velocity super-Earth K2-18c with HARPS and CARMENES
Authors: Cloutier R. , Astudillo-Defru N. , Doyon R. , Bonfils X. , Almenara J.-M. , Bouchy F. , Delfosse X. , Forveille T. , Lovis C. , Mayor M. , Menou K. , Murgas F. , Pepe F. , Santos N. C. , Udry S. , Wünsche A.
Published: October 2018

In an earlier campaign to characterize the mass of the transiting temperate super-Earth K2-18b with HARPS, a second, non-transiting planet was posited to exist in the system at ~9 days. Further radial velocity follow-up with the CARMENES spectrograph visible channel revealed a much weaker signal at 9 days, which also appeared to vary chromatically and temporally, leading to the conclusion that the origin of the 9-day signal was more likely related to stellar activity than to a planetary presence. Here we conduct a detailed reanalysis of all available RV time-series – including a set of 31 previously unpublished HARPS measurements – to investigate the effects of time-sampling and of simultaneous modelling of planetary plus activity signals on the existence and origin of the curious 9-day signal. We conclude that the 9-day signal is real and was initially seen to be suppressed in the CARMENES data due to a small number of anomalous measurements, although the exact cause of these anomalies remains unknown. Investigation of the signal’s evolution in time with wavelength and detailed model comparison reveals that the 9-day signal is most likely planetary in nature. Using this analysis, we reconcile the conflicting HARPS and CARMENES results and measure precise and self-consistent planet masses of mp,b = 8.63 ± 1.35 and mp,c sinic = 5.62 ± 0.84 Earth masses. This work, along with the previously published RV papers on the K2-18 planetary system, highlights the importance of understanding the time-sampling and of modelling the simultaneous planet plus stochastic activity, particularly when searching for sub-Neptune-sized planets with radial velocities.
3D mapping of young stars in the solar neighbourhood with Gaia DR2
Authors: Zari E. , Hashemi H. , Brown A. G. A. , Jardine K. , de Zeeuw P. T.
Published: October 2018

We study the three dimensional arrangement of young stars in the solar neighbourhood using the second release of the Gaia mission (Gaia DR2) and we provide a new, original view of the spatial configuration of the star-forming regions within 500 pc of the Sun. By smoothing the star distribution through a Gaussian filter, we construct three dimensional (3D) density maps for early-type stars (upper-main sequence, UMS) and pre-main sequence (PMS) sources. The PMS and the UMS samples are selected through a combination of photometric and astrometric criteria. A side product of the analysis is a 3D, G-band extinction map, which we use to correct our colour-magnitude diagram for extinction and reddening. Both density maps show three prominent structures, Scorpius-Centaurus, Orion, and Vela. The PMS map shows a plethora of lower-mass star-forming regions, such as Taurus, Perseus, Cepheus, Cassiopeia, and Lacerta, which are less visible in the UMS map due to the lack of large numbers of bright, early-type stars. We report the finding of a candidate new open cluster towards l, b ∼ 218.5° , − 2°, which could be related to the Orion star-forming complex. We estimate ages for the PMS sample and we study the distribution of PMS stars as a function of their age. We find that younger stars cluster in dense, compact clumps, and are surrounded by older sources, whose distribution is instead more diffuse. The youngest groups that we find are mainly located in Scorpius-Centaurus, Orion, Vela, and Taurus. Cepheus, Cassiopeia, and Lacerta are instead more evolved and less numerous. Finally, we find that the 3D density maps show no evidence for the existence of the ring-like structure which is usually referred to as the Gould Belt.
Temperature effect in the calibration of capacitive humidity sensors
Authors: Carvajal Sergio A. , Sánchez Ciro A.
Published: October 2018

Capacitive hygrometers are widely used in industrial and environmental measurements. One of the limitations of these sensors is their temperature dependence. While in temperatures beyond 50 °C the effect has been proven to be significant, for standard conditions in calibration laboratories the magnitude of this dependence has not been rigorously studied. This paper presents the analysis and results of a study of the temperature influence in the calibration of capacitive hygrometers designed for monitoring environmental conditions. Ninety measurements were taken on 15 models of capacitive hygrometers using a two-pressure humidity generator between 30%rh and 80%rh and temperatures from 20 to 30 °C. A three-way analysis of variance (ANOVA) was used to evaluate the data. The results show that the calibration correction is independent of the temperature for the conditions considered; however, there is a correlation between the temperature and the devices, indicating that the gradients in temperature affect each technology of fabrication in a different way.
Timber frame houses resistant to dynamic loads - seismic analysis
Authors: Szczepański Marcin , Migda Wojciech
Published: October 2018

The aim of the article is to present results of seismic analysis results of two real-sized timber frame buildings subjected to seismic excitations. The first model was insulated with mineral wool, the second one with polyurethane foam. Technology and specifications involved in both models construction is based on the previously conducted experimental research on timber frame houses, including wall panels tests, wall numerical models and study on material properties and precisely reflect results of the those research. During the seismic analysis reference node located in buildings were selected. In selected node displacement values were measured and compared between two analyzed models. The results of the numerical analysis presented in the article indicate that the application of polyurethane foam for a skeleton filling of the timber-frame building leads to the increase in stiffness as well as damping of the whole structure, which results in a considerable increase in the seismic resistance of the structure.
Comparative analysis of different numerical models of a steel radial gate
Authors: Brusewicz Krzysztof , Jankowski Robert
Published: October 2018

Hydrotechnical structures are important components in water management system and general flooding safety. Their reliability should be ensured since potential damage might lead to catastrophic consequences. Weir gates are considered to be highly vulnerable elements of each hydro power plant, with regard to its dynamic resistance. The aim of the paper is to compare different numerical models and their influence on the results of a computational modal analysis of a steel radial gate. The investigation has been conducted for models using beam and shell elements, while assuring the same geometry, material properties and boundary conditions. The results of the comparative computational analysis indicate that the eigenmode shapes are similar for both models, while the corresponding eigenfrequencies are considerably different. These differences are important from the point of view of dynamic analysis, especially that the first eigenfrequency falls within the energy range typical for earthquakes and mining tremors.
The experimental comparison of parameters signals of acoustic emission during destructive test on composites based on cement
Authors: Hoduláková Michaela , Kocáb Dalibor , Topolář Libor , Kucharczyková Barbara
Published: October 2018

The paper reports the analysis of acoustic emission signals captured during compressive strength tests of fine-grained cement-based composites of various composition. Acoustic emission monitoring belongs to a non-invasive and passive non-destructive testing technique. It is one of the most sensitive experimental techniques to monitor cracking of materials. While the acoustic emission phenomenon is directly associated with nucleation of cracks in materials based on cement, the measurement of these kinds of materials is readily applied to detect cracking activity. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour.
Computational simulations of the cable-stayed bridge over the Vistula River in Krakow
Authors: Topolewicz Michał , Topolewicz Krzysztof
Published: October 2018

This article presents the execution method of a cable stayed bridge over the Vistula River in Krakow together with FEM-based computational simulations carried out during the design process. The performed calculations concern the global system in its final stage and in the construction stages as well as local analysis of construction details. The obtained results made it possible to work out efficient solutions that contribute to a significant reduction of the project cost and execution time shortening.
The Conjugated Triangle Method CTM of the detection of inconsistent bids in the construction industry
Authors: Anysz Hubert , Kaczorek Krzysztof
Published: October 2018

The existing system of bids evaluation in the construction industry does not bring the clients the certainty if all placed bids comprise real, achievable prices. Especially in the road construction sector, where the earthworks create significant part of the works, comparing e.g. the price of 1 km of roads often gives misleading results. The paper comprises the complete proposal to modify the scope of information provided by offerors in the public procurements (in the construction industry) allowing the clients to determine easily if the contractors have placed the consistent offers i.e. if the bid prices are not too high and if the lowest bid price is not a dumping price. The Conjugated Triangle Method (CTM) of inconsistent bid detection in construction industry is based on the three inter-related parameters: means of production, time of works, on the value of works. Regardless of the offered price it should match the other two parameters.
Simulation Method for Scheduling Linear Construction Projects Using the Learning– Forgetting Effect
Authors: Rzepecki Łukasz , Biruk Sławomir
Published: October 2018

Linear projects such as highways, multi-storey buildings or pipelines are implemented by repeating the sequences of processes on units. Repetitive operations affect acquiring more and more experience, which shortens the duration of subsequent activities. On the other hand, the possible breaks in work make this effect disappear. Breaks at work are most often caused by the lack of crew work continuity. While delaying the subsequent sequences of processes properly, it is possible to reduce interruptions and limit the forgetting effect. A simulation method for scheduling linear construction projects has been developed, taking into account the learning and forgetting effect. It allows to increase the probability of the crew work continuity while meeting the project deadline with a specific probability. As a result, the estimation of the project duration is more accurate, which may provide an advantage at the stage of submitting offers in tenders for construction works.
Microstructural Evolution during Partial Melting and Semisolid Forming Behaviors of Two Hot-Extruded Magnesium-Rare Earth Alloys
Authors: Zhang Jian-Sheng , Zhou Jie , Xia Yu-Feng , Li Qian , Tang Yao , Meng Yi
Published: October 2018

Reheating experiments and semisolid compression tests were conducted on two hot-extruded magnesium-rare earth (Mg-RE) alloys, Mg-8.20Gd-4.48Y-0.36Zr-3.34Zn and Mg-3.75Gd-5.15Y-0.75Zr-3.05Zn by using a multistage hot compression test machine. Dissolution of eutectic compounds, growth of grains, and partial melting took place during the reheating of these Mg-RE alloys and resulted in spherical semisolid slurries at certain temperatures (580 °C for Mg–8.20Gd–4.48Y–3.34Zn–0.36Zr, 560 °C for Mg-3.75Gd-5.15Y-0.75Zr-3.05Zn). Owing to the different alloying element contents of these two Mg-RE alloys, eutectic compounds with different morphologies were found inside them after reheating and rapid cooling processes. The forming characteristics of these two Mg-RE alloys in semisolid state were discussed based on the results of compression tests.
Optimization of gas turbine engine control using dynamic programming
Authors: Kuz’michev Venedikt , Krupenich Ilia , Filinov Evgeny , Tkachenko Andrey
Published: October 2018

The aim of engine control optimization is to derive the optimal control law for engine operation managing during the aircraft flight. For numerical modeling a continuous flight process defined by a system of differential equations is replaced by a discrete multi-step process. Values of engine control parameters in particular step uniquely identify a system transitions from one state to another. The algorithm is based on the numerical method of dynamic programming and the Bellman optimality principle. The task is represented as a sequence of nested optimization subtasks, so that control optimization at the first step is external to all others. The optimum control function can be determined using the minimax principle of optimality. Aircraft performance calculation is performed by numerical integration of differential equations of aircraft movement.
Parametric Performance of Ultra-light Gas Turbine Power Plant for Heavy Lift Multicopters Flight Systems Using Astra - Russian Aviation Engine Optimization Software
Authors: Vimalachandran T. Aurthur , Tkachenko Andrey Yurievich , Rybakov Viktor Nikolaevich
Published: October 2018

A detailed parametric analysis was performed on entire performance cycle model of micro gas turbine power plant. The parametric analysis was studied using Russian Software named ASTRA. Evaluation of parameters on both design and operation condition was performed. The parameters focused here are power output, compression work, specific fuel consumption and thermal efficiency. Various stages such as use of Intercooler, Pre-heater and their optimal influence on thermodynamics were performed. The task was to optimize the maximum output in free turbine power by simulating various cycles of compressor pressure ratios for centrifugal compressor, ambient temperature in various altitude; air-fuel mix ratio and turbine inlet temperature. The results are analysed and presented in this article, the Analysis known as on-design analysis. The compressor uses 66% of turbine work output. The research analysis focuses on reducing the use of power output by compressor and maximizes the power output by free turbine. The results could be summarized as increase in gas turbine thermal efficiency does not always improve the gas turbine efficiency. Optimum power increase of up to 3% was improved and improvement in fuel efficiency improved about 4%.
A Path Tracking Method for Autonomous Rice Drill Seeder in Paddy Fields
Authors: Zhang Yan , Li Yanming , Huang Yixiang , Liu Xiangpeng , Liu Chengliang
Published: October 2018

For the purpose of overcoming the obstacles in application of autonomous rice drill seeder in paddy fields, a path tracking algorithm with high accuracy used for steering control during straight traveling in uneven muddy paddy fields is introduced in this paper. Combining lateral deviation and heading angle deviation as feedback, a nonlinear steering control model is developed in the algorithm. To avoid the position error caused by incline, the influence brought by the roll angle and the pitch angle of the vehicle on position coordinates are taken into account when the vehicle is on a slant. The experiments carried out in arable paddy fields show that the mean absolute lateral deviation of the algorithm was less than 2.9 centimeters and the heading angle deviation was less than 0.03°. The path tracking algorithm is able to meet the required precision for autonomous rice drill seeder in paddy fields of China.
Three-dimensional Finite Element Modelling of the Cylindrical Specimen Upsetting
Authors: Murashov Mikhail V. , Vlasov Andrey V.
Published: October 2018

Friction has a substantial influence on the metal forming at upsetting of cylindrical aluminum specimens. The finite element method is often used to investigate this problem. This paper aims to reveal possible numerical errors and obstacles related to the 3D finite element solution of the problem. The calculation results for the proposed numerical 3D-model are compared with the experimental data. The influence of friction is demonstrated and a good agreement on the tool displacement is obtained. The features of the numerical solution of the problem in the ANSYS finite element software are shown.
Reducing Drag of Body by Adding a Plate
Authors: Vladimir A. Frolov , Anna S. Kozlova
Published: October 2018

This paper focuses on theoretical investigations of the location of a separation point laminar boundary layer on the surface of a circular cylinder. The investigations were carried out by CFD software FlowSimulation. The displacement of the separation point on the surface of the circular cylinder is achieved by installing a flat plate in front of the cylinder parallel to the flow. It was found that the greatest displacement of the separation point to the back of the cylinder is possible when the chord of the plate equals to a quarter of the diameter of the circular cylinder. The flat plate allows not only to change the position of the separation point but also to reduce the drag by about 25%.
Approach towards Establishing a Backup Satellite Attitude Control System Based on the Photovoltaic Array
Authors: Sedel’nikov Andry V. , Safronov Sergey L. , Filippov Alexander S. , Savich Ekaterina K.
Published: October 2018

During the design stage of a spacecraft it is important to carry out a thorough analysis of potential onboard equipment failures in order to develop means of their mitigation so that the satellite would remain fully functional for the entirety of its lifespan. The article demonstrates an idea towards establishing a backup satellite attitude control system based on the photovoltaic array of the power control system.
The Modular Design and Analysis of Open CNC System Machine
Authors: Li Xueguang , Yang Pan , Chen Zhe , Miao Liqin
Published: October 2018

According to the demanding of design and development about small 3 axes numerical control machine, three machine structure schemes were designed, the finite element method was used to analyze and optimize the machine structure, the movable gantry machine structure was decided as the ultimate scheme, the open numerical control system which includes NC program editing, tool path simulation, machine condition data displaying and computer aided process planning functions was developed in DELPHI language based on “PC+ motion controller” mode, the system modules can be customized by users, based on above all, the machine was assembled successfully.
Nominal stress based equal fatigue bearing capacity design of HSLA steel V-shaped butt-welded joints
Authors: Xue Wen , Wang Ping , Dong Zhibo , Fang Hongyuan
Published: October 2018

Based on nominal stress, this paper proposed a fatigue life estimation method of V-shaped butt welded joints. Then, the fatigue bearing capacity of the base metal under the same fatigue load was used as design goal of the V-shaped butt welded joints and an equal fatigue bearing capacity (EFBC) design method for V-shaped butt welds was thus formed. High strength low alloy steel Q690 was chosen as the experimental material to carry out the equal fatigue bearing capacity design.
Reliability Implementation and Cost Trade-off of Product during the Development Process
Authors: Wang Wei , Li Yuan , Zhang Qi , Feng Weijia , Liu Huichao , Liu Pengyan
Published: October 2018

Modern product needs to meet the reliability requirements during the development process. The reliability in this paper refers to an integral view of a product’s reliability, maintainability, supportability, testability, safety and environmental adaptability. However, during the product development process, the two problems are how to evaluate the implementation and how to determine the work input costs of reliability. This paper proposes a method to evaluate the degree of reliability implementation. And it researches the schemes and targets decision-making method based on trade-off analysis. Through establishing and solving trade-off optimization model, the results can help decision makers find the optimal parameters program and cost goals.
Workload analysis for Sanding Small Grand Piano Department in Manufacturing company
Authors: Sari Amarria Dila , Basyir Ahmad Azhar , Suryoputro M.Ragil
Published: October 2018

The production process is one of the main activities of manufacturing companies that need their continuous improvement and continuously. There are several factors that affect productivity, such as job stress and workload. The workload is shared with uneven to make the work environment uncomfortable. The production data in April 2017 explaining that the sanding small grand piano average produces for 20 units piano/day, with a production target of 21 units piano/day production target has not been achieved. The lack of achievement of these targets due to the difference between the expected level of ability with the capacity level. In this study focused to determine the operator workload on sanding small grand piano is included in the painting section. The workload is calculated using the method of Full-Time Equivalent (FTE). The results showed that the operators have overloaded with FTE scores of both 1.33, 1.35 and 1.34 While the operators have an underload workload with a value of FTE 0.94. 0.64, 0.72. Therefore, Kaizen activity such as balancing jobdesk and modification stopper were applied to reduce the waste. Workload after kaizen plan has decreased each 0.02 FTE with change of work element, each operator has a uniform workload with an average FTE value of 1.13 (underload).