bluuebunny/crossref_metadata_2025_split huggingface dataset:
Four Degrees‐of‐Freedom Direct Writing of Liquid Metal Patterns on Uneven Surfaces
Authors: Yoon Young , Kim Shinmyoung , Kim Doyoon , Kauh Sang Ken , Lee Jungchul 
Published: October 2018

AbstractA novel direct writing of eutectic gallium indium (EGaIn) patterns on uneven surfaces including both inclined and curved substrates is reported. The approach relies on four degrees‐of‐freedom motion control of the pressurized EGaIn dispenser and precise sensing of the dispenser tip–substrate distance. An experimental hardware is built by using three motorized linear stages, a motorized rotation stage, two electronic pressure regulators, and a laser distance sensor and operating programs are developed. While the rotation stage makes the laser sensor always precede the dispenser tip by a predetermined value, the vertical stage maintains the dispenser tip–substrate distance by using the readout of the laser sensor recorded beforehand. By incorporating the time delay from the laser sensor preceding the dispenser tip for feedback control of the dispenser tip position, various EGaIn patterns are directly written on uneven substrates with their widths being 70–80 µm. Electrical connectivity and structural integrity of written EGaIn patterns are confirmed by the light‐emitting diode mounted between two end segments of EGaIn patterns. The maximum slope for reliable patterning is found to be ≈20°. To show practical applications of this new concept, a curved keypad and a glove‐type wearable device with strain sensors integrated are demonstrated.
Study of the influence of initiator content in the polymerization reaction of a thermoplastic liquid resin for advanced composite manufacturing
Authors: Raponi Olivia de Andrade , Barbosa Lorena Cristina Miranda , de Souza Bárbara Righetti , Ancelotti Junior Antonio Carlos 
Published: October 2018

AbstractConsiderable interest has been generated in the last years in the use of thermoplastics polymers as matrices in advanced composites manufacturing. In this research, a new Elium® acrylic matrix developed by Arkema has been studied to evaluate the influence of different benzoyl peroxide initiator (Luperox®78) contents on the polymerization reactions for Elium®150. For that, thermal and rheological analyses were performed providing a better understanding of these reactions. The results show that the initiator concentration and temperature affect the resin's properties not only in the initiation step, but also in the resin's complete polymerization reaction. Besides that, it was observed that the initiator concentration can also affect the polymer chain lengths, which may lead to variations in the dynamic mechanical properties and thermal stability of the polymer.
Chiral Lewis Acid Catalyzed Reactions of α‐Diazoester Derivatives: Construction of Dimeric Polycyclic Compounds
Authors: Tan Fei , Liu Xiaohua , Wang Yan , Dong Shunxi , Yu Han , Feng Xiaoming 
Published: October 2018

AbstractAn unexpected homologation/dyotropic rearrangement/interconversion/[3+2] cycloaddition cascade reaction of α‐diazoester‐terminated N‐propyl‐substituted isatin derivatives was achieved in the presence of a chiral N,N′‐dioxide/ScIII catalyst. This catalytic manifold allows rapid construction of several classes of dimeric polycyclic compounds with good yields and high levels of diastereo‐ and enantioselectivity (up to 99 % ee). Furthermore, macrocyclic dimers can be obtained by an intermolecular homologation process.
Struktur und Reaktivität der Al‐O(H)‐Al‐Einheiten in Siloxidgerüstverbindungen – Modellstudien in Lösung und in Isolation
Authors: Lokare Kapil Shyam , Braun‐Cula Beatrice , Limberg Christian , Jorewitz Marcel , Kelly John T. , Asmis Knut R. , Leach Stephen , Baldauf Carsten , Goikoetxea Itziar , Sauer Joachim 
Published: October 2018

AbstractObwohl Aluminiumoxide und Aluminosilicate in vielen Bereichen eingesetzt werden, bleiben deren Oberflächenheterogenität und insbesondere das Defektverhalten nach Hydroxylierung/Dehydroxylierung auf molekularer Ebene weitestgehend unverstanden. Wir untersuchen die molekulare Modellverbindung [Al3(μ2‐OH)3(THF)3(PhSi(OSiPh2O)3)2], 1, um die Säure‐Base‐Reaktivität von cyclischen Al3(μ2‐OH)3‐Einheiten aufzuklären. Wir können zeigen, dass 1, ähnlich wie Zeolithe, eine ausreichende Acidität aufweist, um die Isomerisierung von Olefinen zu katalysieren. Simulationen und Gasphasen‐Schwingungsspektroskopie an lösungsmittelfreiem und deprotoniertem 1 zeigen, dass die Deprotonierung einer Hydroxygruppe die sechsgliedrige Ringstruktur des Al3(μ2‐OH)3‐Kerns destabilisiert und in eine Struktur aus zwei kantenverknüpften viergliedrigen Ringen umlagert. Dies macht AlIV‐O(H)‐AlIV‐Einheiten zu stark sauren Funktionalitäten, und alle Ergebnisse zusammen legen nahe, dass ihre Acidität mit derjenigen zeolithischer SiIV‐O(H)‐AlIV‐Gruppen vergleichbar ist.
Enabling Visible‐Light‐Driven Selective CO2 Reduction by Doping Quantum Dots: Trapping Electrons and Suppressing H2 Evolution
Authors: Wang Jin , Xia Tong , Wang Lei , Zheng Xusheng , Qi Zeming , Gao Chao , Zhu Junfa , Li Zhengquan , Xu Hangxun , Xiong Yujie 
Published: October 2018

AbstractQuantum dots (QDs), a class of promising candidates for harvesting visible light, generally exhibit low activity and selectivity towards photocatalytic CO2 reduction. Functionalizing QDs with metal complexes (or metal cations through ligands) is a widely used strategy for improving their catalytic activity; however, the resulting systems still suffer from low selectivity and stability in CO2 reduction. Herein, we report that doping CdS QDs with transition‐metal sites can overcome these limitations and provide a system that enables highly selective photocatalytic reactions of CO2 with H2O (100 % selectivity to CO and CH4), with excellent durability over 60 h. Doping Ni sites into the CdS lattice leads to effective trapping of photoexcited electrons at surface catalytic sites and substantial suppression of H2 evolution. The method reported here can be extended to various transition‐metal sites, and offers new opportunities for exploring QD‐based earth‐abundant photocatalysts.
Ein NiII‐haltiges Vitamin‐B12‐Derivat mit einem Kofaktor‐F430‐artigen π‐System
Authors: Brenig Christopher , Prieto Lucas , Oetterli René , Zelder Felix 
Published: October 2018

AbstractF430, ein einzigartiger enzymatischer Kofaktor, ist an der Bildung und Oxidation von Methan in streng anaeroben Bakterien beteiligt. Das Schlüsselenzym Methyl‐Koenzym‐M‐Reduktase (MCR) weist in seinem aktiven Zentrum einen porphinoiden Nickel‐Komplex auf, der ein charakteristisches Absorptionsmaximum bei etwa 430 nm zeigt. Hier berichten wir über die dreistufige, von Vitamin B12 ausgehende Partialsynthese eines hybriden NiII‐haltigen Corrins, dessen strukturelle und spektroskopische Eigenschaften teilweise denen von F430 ähneln. Schlüsselschritt der Syntheseroute ist die simultane Demetallierung und Ringschlussreaktion eines 5,6‐Secocobalamins zum metallfreien 5,6‐Dihydroxy‐5,6‐dihydrohydrogenobalamin mittels Cobaltocen und KCN unter reduktiven Bedingungen. Untersuchungen zur Koordinationschemie der neuartigen Verbindung untermauern die frühere Hypothese, warum die natürliche Selektion des Corphinliganden gegenüber dem Corrinliganden in F430 es ermöglichte, anspruchsvolle Ni‐katalysierte Reaktionen in biologischen Systemen durchzuführen.
Reliability of acoustic tomography and ground‐penetrating radar for tree decay detection
Authors: Wu Xi , Li Guanghui , Jiao Zhi , Wang Xiping 
Published: October 2018

Premise of the StudyVarious nondestructive testing technologies have been used for detecting and visualizing internal defects in urban trees. The results obtained by using different nondestructive testing tools can be interpreted in different ways, which may result in inaccurate assessment of the true condition of the inspected trees. The main objective of this study was to evaluate the reliability of acoustic tomography and ground‐penetrating radar (GPR) technology for detecting internal decay in a number of different tree species.MethodsOne hundred and forty‐seven individual trees of 33 species were inspected at a historic park in Yangzhou, Jiangsu Province, China, using a combination of visual inspection, acoustic tomography, GPR scanning, and resistance micro‐drilling methods. Special image processing procedures were developed to analyze the acoustic and radar images and to estimate the proportion of compromised wood.ResultsThe acoustic tomography tests revealed 10 defective trees with acoustic shadows suggesting compromised wood in more than 10% of the cross‐section area. The actual nature of these defects on living trees can be ascertained by conducting resistance micro‐drilling at selected paths. The Tree Radar Unit (TRU) System produced 85% false positive predictions and thus was not successful in visualizing the true physical conditions of the trees.ConclusionsAcoustic tomography can successfully detect trees with internal decay and cavities. A combination of visual inspection, acoustic tomography, and resistance micro‐drilling is an effective approach to detect, measure, and visualize internal defects on a diversity of tree species. The image processing procedures we developed make possible the quantitative analysis of compromised wood and could improve the science‐based tree risk assessment process. In contrast, the TRU System presented challenges in field applications, particularly on trees with small diameters and irregularly shaped trunks. The images obtained in this study using the TRU system were largely inaccurate and not reliable for tree inspection.
Olfactory attraction mediated by the maxillary palps in the striped fruit fly, Bactrocera scutellata: Electrophysiological and behavioral study
Authors: Park Kye Chung , Jeong Seon Ah , Kwon Gimyon , Oh Hyun‐Woo 
Published: October 2018

AbstractHere, we report that the olfactory attraction of the striped fruit fly, Bactrocera scutellata (Hendel; Diptera: Tephritidae), a serious pest of pumpkin and other cucurbitaceae plants, to cue lure and raspberry ketone is mediated by the maxillary palps. The antennae, bearing three morphological types (basiconic, trichoid, and coeloconic) of olfactory sensilla, in male and female
B. scutellata exhibited significant electroantennogram (EAG) responses to a plant volatile compound, 3‐octanone, and methyl eugenol, whereas cue lure, raspberry ketone, and zingerone that are known to attract several other species of
Bactrocera fruit flies elicited no significant EAG responses from both sexes. In contrast, maxillary palps, housing one morphological type of basiconic sensilla, displayed the largest electropalpogram (EPG) responses to cue lure followed by raspberry ketone among the five compounds tested in male and female
B. scutellata, with only minor EPG responses to 3‐octanone, which indicates that the maxillary palps are responsible for detecting cue lure and raspberry ketone in this species. In field trapping experiments, significant number of male
B. scutellata were captured in the traps baited with cue lure or raspberry ketone, in which the attractiveness of cue lure was significantly higher than that of raspberry ketone. Methyl eugenol and zingerone were not behaviorally attractive to
B. scutellata although they elicited significant EPG responses. Our study indicates that the behavioral attraction of
B. scutellata to cue lure and raspberry ketone is mediated by the olfactory sensory neurons present in the maxillary palps.
N‐back training and transfer effects revealed by behavioral responses and EEG
Authors: Pergher Valentina , Wittevrongel Benjamin , Tournoy Jos , Schoenmakers Birgitte , Van Hulle Marc M. 
Published: October 2018

AbstractIntroductionCognitive function performance decreases in older individuals compared to young adults. To curb this decline, cognitive training is applied, but it is not clear whether it improves only the trained task or also other cognitive functions. To investigate this, we considered an N‐back working memory (WM) training task and verified whether it improves both trained WM and untrained cognitive functions.MethodsAs EEG studies have noted task difficulty and age‐related changes in time‐locked EEG responses, called event‐related potentials (ERPs), we focused on the relation between the P300 ERP component, task difficulty level, and behavior response accuracy and reaction time (RT) in young and older healthy adults. We used two groups of young and older healthy participants to assess the effect of N‐back training: cognitive training group (CTG) and passive control group (PCG). Before and after training, cognitive tests were administered to both groups to evaluate transfer effects.ResultsDespite the observed age‐related differences in the P300 ERP component and in terms of RT and accuracy, our findings demonstrate a stronger improvement in the trained task for older CTGs compared to younger CTGs, larger near‐ and far‐transfer effect to WM and fluid intelligence for both younger and older CTGs, and a far‐transfer effect to attention but only for older adults. Significant differences in response accuracy were shown between young and older subjects in spatial memory and attention tests.ConclusionThe application of a WM training is a promising tool for both healthy adults, and in particular for older subjects, as it showed physiological and behavioral differences in cognitive plasticity across life span and evidence of benefits in the trained task and near‐/far‐transfer effects to other cognitive functions.
Enhanced Delivery of Synthetic Labelled Ubiquitin into Live Cells by Using Next‐Generation Ub–TAT Conjugates
Authors: Hameed Dharjath S. , Sapmaz Aysegul , Gjonaj Lorina , Merkx Remco , Ovaa Huib 
Published: October 2018

AbstractProteins and other macromolecules can be delivered into live cells by noninvasive techniques using cell‐penetrating peptides. These peptides are easily synthesised by solid‐phase peptide synthesis and can be conjugated onto cargo molecules to mediate cellular delivery. We designed a TAT‐based cell‐penetrating ubiquitin (Ub) reagent by conjugating a dimeric disulfide‐linked TAT peptide to the C terminus of a rhodamine‐labelled Ub (RhoUb) protein. This reagent efficiently enters the cell by endocytosis and escapes from endosomes into the cytoplasm. Once the conjugate is inside the cytoplasm, the delivery vehicle is proteolytically removed by endogenous deubiquitinases (DUBs), at which point the intrinsic ubiquitination machinery is able to incorporate the RhoUb into ubiquitin conjugates. Our approach enables the controlled delivery of labelled or mutant Ub derivatives into cells, increasing our options for studying the ubiquitin system.
In vitro flow and optical coherence tomography comparison of two bailout techniques after failed provisional stenting for bifurcation percutaneous coronary interventions
Authors: Adjedj Julien , Picard Fabien , Mogi Satoshi , Iwasaki Kiyotaka , Aoumeur Hamid , Alansari Omar , Agudze Edem , Wijns William , Varenne Olivier 
Published: October 2018

AbstractObjectivesTo evaluate, in vitro, SB stenting techniques after failed provisional stenting. We aimed to compare flows and stent strut apposition of T and protrusion (TAP) versus Reversed String (RS) techniques using a flow simulator, optical coherence tomography (OCT) using silicon bifurcation phantoms with different bifurcation angulations.BackgroundWhile bifurcation coronary artery stenoses are preferably treated with provisional T‐stenting strategy, the preferred bailout two stents technique to treat the side branch remains unclear.Methods and resultsEleven 30°‐angle and ten 60°‐angle bifurcation phantoms were used. After performing provisional stenting, TAP and RS techniques were compared in six phantoms with 30° and five with 60° angles. Flow measurement was performed using absolute coronary flow and particle image velocimetry techniques. Strut apposition was evaluated using OCT. Flow analyses showed that disturbed flow regions were observed in the vicinity of floating struts protruded into the lumen both regardless of TAP and RS techniques. OCT analysis showed a higher proportion of floating struts protruding into the main branch with TAP compared to RS, respectively (13% vs. 1%; P <0.001) in both angles.ConclusionsRS reduces the proportion of floating struts protruding into the main branch compared to TAP, at comparable flow rates. Clinical studies are needed to evaluate feasibility and potential clinical benefit of this technique.
On the Geometrical Stability of Square‐Planar Platinum(0) Complexes That Bear a PNP‐Pincer‐Type Phosphaalkene Ligand (Eind2‐BPEP)
Authors: Taguchi Hiro‐omi , Tanigawa Ippei , Takeuchi Katsuhiko , Ozawa Fumiyuki 
Published: October 2018

AbstractThe four‐coordinate Pt0 complex [Pt(PPh3)(Eind2‐BPEP)] (Eind=1,1,3,3,5,5,7,7‐octaethyl‐1,2,3,5,6,7‐hexahydro‐s‐indacen‐4‐yl; BPEP=2,6‐bis(1‐phenyl‐2‐phosphaethenyl)pyridine), which bears a PNP‐pincer‐type phosphaalkene ligand (Eind2‐BPEP; PNP=N,N‐bis(diphenylphosphine)‐2,6‐diaminopyridine), were found to adopt a square‐planar configuration around the Pt center (τ4=0.11). This coordination geometry is very uncommon for formal d10 complexes. In this study, a series of ligands with different electronic properties (i.e., DMAP, 2,6‐lutidine, PMe3, tBuNC, and CO) were introduced in place of PPh3, and their effects on the coordination geometry were examined. X‐ray diffraction analysis revealed that all complexes adopted a square‐planar configuration (τ4=0.20–0.27). In contrast, DFT calculations indicated that the geometrical stability towards distortion around Pt varied with the ligand. The complexes with pyridine‐based ligands had rigid planar structures, whereas those with π‐accepting ligands, such as CO, were relatively flexible towards distortion. The electronic effects of the ligands were reflected in the spectroscopic properties of the complexes, which showed a large color change in the near‐infrared region.
Star‐Shaped and Fused Electron Acceptors based on C3h‐Symmetric Coplanar Trindeno[1, 2‐b: 4, 5‐b′: 7, 8‐b′′]trithiophene Core for Non‐Fullerene Solar Cells
Authors: Wang Weijie , Wu Xiaofu , Hang Hao , Li Hua , Chen Yonghong , Xu Qian , Tong Hui , Wang Lixiang 
Published: October 2018

AbstractTwo new star‐shaped and fused electron acceptors, TITT‐3IC and TITT‐3ICF have been designed and synthesized, which consist of a C3h‐symmetric coplanar trindeno[1, 2‐b: 4, 5‐b′: 7, 8‐b′′]trithiophene (TITT) as the central core and 3‐(dicyanomethylidene)indan‐1‐one and 2‐(5,6‐difluoro‐3‐oxo‐2,3‐dihydro‐1H‐inden‐1‐ylidene) malononitrile as the peripheral electron‐withdrawing groups, respectively. With the large coplanar configuration and electron‐rich nature of π‐conjugated backbone, these two acceptors exhibit strong intermolecular charge transfer absorption in the region of 500–650 nm with the optical band gaps around 1.9 eV. Relative to TITT‐3IC, TITT‐3ICF shows the downshifted LUMO level and the slightly redshifted absorption with the higher molar extinction coefficient due to the stronger electron‐withdrawing effect of fluorination. When blending with PTB7‐Th, the TITT‐3ICF‐based device displays a higher power conversion efficiency (PCE) of 4.26 % than the TITT‐3IC‐based device (PCE=3.87 %). Comparing with the TITT‐3IC‐based device, the increased short circuit current (JSC) and fill factor (FF) are responsible for the higher PCE value of the TITT‐3ICF‐based device, which benefits from its strong and redshifted absorption for light harvesting and proper phase separation morphology for effective exciton dissociation and charge transport. This work demonstrates that as an alternative electron‐donating core, TITT will be promising in designing star‐shaped non‐fullerene materials.
Strong effect of the simultaneous color contrast in an afterimage
Authors: Ikeda Mitsuo , Phuangsuwan Chanprapha 
Published: October 2018

AbstractThe color appearance of the afterimage of the simultaneous color contrast pattern was investigated by the elementary color naming method. The color appearances of the surrounding, an afterimage of the surrounding, and the test patch were measured, and the results were shown on the polar diagram of the opponent colors theory. The colors of both the surrounding and the afterimage of the test patch were the same. The relationship between the afterimage color of the test patch and the afterimage of the surrounding was found to be the same as the relationship between the illumination color and the test patch color in the two‐rooms technique, implying that the same visual mechanism works for both situations, that is, eyes chromatically adapt to the afterimage color of the surroundings, and the afterimage color of the test patch is determined with the eyes so adapted.
Brand purchase prediction based on time‐evolving user behaviors in e‐commerce
Authors: Dong Yunqi , Jiang Wenjun 
Published: October 2018

SummaryPurchase prediction is a key function in the e‐commerce recommendation system. Existing works usually focus on item‐level purchase prediction, which faces two issues of high cost and low accuracy. In this paper, we study brand purchase prediction by exploring behaviors, which may lead to brand purchases. We make three progresses. (1) We analyze a real world e‐commerce data from multiple angles. Focusing on users' brand purchases, we find behaviors' evolution with time and behaviors' interaction. (2) For different behaviors, we extract different time‐evolving features that can serve as indicators of users' brand purchase. (3) We use a logistic regression‐based model by adjusting the parameters of time‐evolving feature and others in two different scenarios (the promotion purchase prediction and the daily purchase prediction) to construct two experiments. The experiment results show that the model using three types features performs the best in both scenarios, and the time‐evolving feature plays the most important role among them. (4) We distinguish the feature importance in different scenarios. Based on the importance, we find that users' purchases in the promotion scenario are likely to be impulsive, while purchases in the daily scenario are more likely to be influenced by users' activities.
Enhanced transductive support vector machine classification with grey wolf optimizer cuckoo search optimization for intrusion detection system
Authors: Roopa Devi E.M. , Suganthe R.C. 
Published: October 2018

SummaryThese days, the Intrusion detection System (IDS) is the most talked topic among the scientist and researchers and many research is going on in IDS, which is firmly connected to the protected utilization of system administrations. IDS are an essential part of the security infrastructure. The previous research works are focused to detect the attacks efficiently but it is failed to produce more accurate classification results. To stay away from the previously mentioned issues, in the proposed framework, Hybrid Grey Wolf optimizer Cuckoo Search Optimization (HGWCSO) along with Enhanced Transductive Support Vector Machine (ETSVM) is proposed. This exploration incorporates the modules are, for example, preprocessing, selection of features and classification of features. The processing of data is done by using normalization technique by using min‐max technique the main work is to replace the value missed and filters the features from NSL KDD dataset values. The main objective of processing of data is to increase the accuracy of classification. Then, the more relevant and optimal features are selected by using HGWCSO. The GWO robustness and searching performance is increased by cuckoo search algorithm. Then, the classification is performed to identify the intrusion attack types using ETSVM algorithm more efficiently. This classification algorithm is used to improve the attack detection accuracy higher. The experimental result concludes that the proposed HGWCSO with ETSVM algorithm provides better performance metrics in terms of high precision, sensitivity, specificity, and accuracy than the previous algorithms.