nils-herrmann/clean_scirepeval huggingface dataset:
Electronic properties and the nature of metal insulator transition in NdNiO3 prepared at ambient oxygen pressure

We report the electronic properties of the NdNiO 3 prepared at the ambient oxygen pressure condition. The metal insulator transition temperature is observed at 192 K, but the low temperature state is found to be less insulating compared to the NdNiO 3 prepared at high oxygen pressure. The electric resistivity, Seebeck coefficient and thermal conductivity of the compound show large hysteresis below the metal insulator transition. The large value of the effective mass m* 8 m e in the metallic state indicates the narrow character of the 3d band. The electric conduction at low temperatures T =2 20 K) is governed by the variable range hopping of the charge carriers.
Synthesis of silica aerogels microspheres prepared by ink jet printing and dried at ambient pressure without surface hydrophobization

Silica aerogel microspheres were synthesized by sol gel process via ambient pressure drying using tetraethylorthosilicate as precursor, and ink jet printing to shape the microspheres. Aerogels were synthesized with and without the surface hydrophobization step and at different volumetric ratios of sol precursor and a continuous oil phase, which was used to stabilize the spheres ejected by printer. By the first time, SiO2 aerogel precursor was successfully ambient dried without modification step, keeping its integrity (cracks free) and with minimal size contraction, which was verified by comparison with the aerogel spheres obtained by the process of surface hydrophobization and drying.
Strong and machinable carbon aerogel monoliths with low thermal conductivity prepared via ambient pressure drying

Carbon aerogels are among the most attractive porous carbon materials currently, but their real world applications are greatly limited by their high cost, complicated preparation process and low mechanical properties. Herein, we report a very facile route to prepare lightweight but mechanically strong carbon aerogel monoliths (CAMs) through a sol gel polymerization of linear phenolic resin and hexamethylenetetramine (HMTA) followed by ambient pressure drying and carbonization. The good capability of linear phenolic resin with ethanol could induce the formation of large polymer particle and good particle connectivity, affording robust network to suppress the collapse during the ambient drying. The synthesis is scalable and flexible, permitting a facile tailor of density, porous structure and mechanical strength by adjusting the ratio of phenolic resin to HMTA and phenolic resin concentration. The obtained CAMs possess macroporous/microporous hierarchical structure with low density as low as 0.07 g cm 3, high mechanical strength of 0.9 5.0 MPa and low thermal conductivity (0.032 0.069 W m l K 1) Further CO2 activation can greatly develop the microporosity without sacrificing the monolithic structure. Moreover, as prepared CAMs can be fabricated in large sizes, as well as being post machined into many shapes and sizes for potential applications.
Synthesis and Characterization of Rice Husk Ash Derived Silica Aerogel Beads Prepared by Ambient Pressure Drying

Low density silica aerogel beads were synthesized from rice husk ash via sodium silicate route. The gel beads were prepared by the ball dropping method and dried at ambient pressure after surface modification (silylation) with trimethylchlorosilane (TMCS) solution. The characteristics of porous structure of silica aerogel beads were measured by Brunauer Emmett Teller (BET) nitrogen adsorption and desorption method. The silica aerogel beads showed a specific surface area as high as 773 m2/g. They also displayed water repellant effect (hydrophobic) due to silylation as revealed by Fourier transform infrared spectroscopy (FTIR)
Preparation of hydrophobic silica aerogel with kaolin dried at ambient pressure

A method for preparing hydrophobic silica aerogel with kaolin as raw material and dried at ambient pressure is proposed. The process of preparing the aerogel consists of three stages including activation of kaolin, preparation of wet silica gel and hydrophobic modification. The effects of hydrochloric acid concentration on the physical properties and structures of the silica aerogel are investigated. Effects of removing Na+ from the solvent solution on the structure and properties of aerogel are discussed. The aerogel obtained with kaolin has comparable structure and property to those prepared with other more expensive silica sources. The newly proposed method is expected to simplify the manufacturing technique, to shorten the production time and to reduce the costs of silica aerogel.
Ambient Pressure XPS Study of a Ni Fe Electrocatalyst for the Oxygen Evolution Reaction

Chemical analysis of solid liquid interfaces under electrochemical conditions has recently become feasible due to the development of new synchrotron radiation techniques. Here we report the use of "tender" X ray ambient pressure X ray photoelectron spectroscopy (APXPS) to characterize a thin film of Ni Fe oxyhydroxide electrodeposited on Au as the working electrode at different applied potentials in 0.1 M KOH as the electrolyte. Our results show that the as prepared 7 nm thick Ni Fe (50% Fe) film contains Fe and Ni in both their metallic as well as oxidized states, and undergoes further oxidation when the sample is subjected to electrochemical oxidation reduction cycles. Metallic Fe is oxidized to Fe3+ and metallic Ni to Ni2+/3+ This work shows that it is possible to monitor the chemical nature of the Ni Fe catalyst as a function of potential when the corresponding current densities are small. This allows for operando measurements just above the onset of OER; however, current densities as they are desire.
b RE1 xBixB3O6 (RE Sm, Eu, Gd, Tb, Dy, Ho, Er, Y) Bi(3+ Substitution Induced Formation of Metastable Rare Earth Borates at Ambient Pressure.
Venue: Inorganic chemistry

There emerge great interests in the syntheses of metastable polyborates; however, most are involved with the high pressure technique. A facile method to synthesize metastable rare earth borates at ambient pressure is eagerly required for the large scale production and property investigation. Here we demonstrate the critical role of Bi(3+ substitutions in the stabilization of metastable b REB3O6 (RE Sm, Eu, Gd, Tb, Dy, Ho, Er, and Y) at ambient pressure, where the Bi(3+ to RE(3+ substitutions would efficiently reduce the synthetic temperatures to 735 820 degC, well below the upper limit of thermodynamically stable window (840 980 degC) Partial solid solutions of b RE1 xBixB3O6 were prepared, and the ranges of the solution were also studied experimentally. The thermal behaviors of b RE0.8Bi0.2B3O6 were investigated by differential thermal analyses and powder X ray diffraction, and they were divided into two categories; that is, b RE0.8Bi0.2B3O6 (RE Sm, Eu, Gd) transfers to a RE0.8Bi0.2B3O6 with further increasing the temperature to 950 degC, while b RE0.8Bi0.2B3O6 (RE Tb, Dy, Ho, Er, and Y) decomposes into hexagonal REBO3 and B2O3. In particular, the allowed concentration of Bi(3+ in b Gd1 xBixB3O6 was 0.10 x 0.25, and these samples show bright blue emissions under UV excitation, which suggests the high efficiency of light absorption and high potential as phosphors with further doping of other activators.
Promotional effect of Fe on the performance of supported Cu catalyst for ambient pressure hydrogenation of furfural

A noble metal free FeCu based bimetallic catalyst system prepared by facile co impregnation method was found to be highly admirable for vapour phase selective hydrogenation of furfural to furfuryl alcohol at ambient pressure. Monometallic Cu/g Al2O3, Fe/g Al2O3 and bimetallic FeCu/g Al2O3 catalysts with different Fe loadings were prepared. Structural and morphological features of the catalysts were thoroughly investigated by several physico chemical characterization techniques. The influence of various reaction parameters, such as Fe loading, reaction temperature and flow of reactants was examined with respect to furfural conversion and furfuryl alcohol yield. The results clearly showed that an optimum amount of Fe is necessary to enhance the catalytic activity of monometallic Cu/g Al2O3 for the selective hydrogenation of furfural. The catalyst FC 10 with 10 wt% Fe exhibited excellent activity which led to high furfural conversion >93% and furfuryl alcohol selectivity >98% under mild reaction conditions. The higher activity of bimetallic FeCu/g Al2O3 compared to monometallic Cu/g Al2O3 is ascribed to the formation of FeCu bimetallic particles and the existence of oxygen vacancies in the Fe oxide system. The superior activity after Fe loading on the Cu based catalyst was attributed to the synergy between Cu and Fe. A plausible mechanism is proposed to explain the promoting effect of Fe, which involves synergism between Fe sites with strong oxophilic nature and Cu sites with a high ability for hydrogen activation. Based on the activity results, prolonged catalytic activity and spent catalyst analysis, the developed FeCu/g Al2O3 catalyst is inexpensive, eco benign and robust, which makes it a promising candidate for the efficient conversion of biomass derived substrates to fine chemicals and drop in biofuels.
"Aren't These Just Young, Rich Women Doing Vain Things Online?" Influencer Selfies as Subversive Frivolity

Taking seriously the global trend of selfies becoming marketable and entangled in ecologies of commerce, this article looks at Influencers who have emerged as (semi )professional selfie producers and for whom taking selfies is a purposively commercial, thoughtful, and subversive endeavor. Based on in depth ethnographic fieldwork and grounded theory analysis, I examine Influencers' engagements with selfies on Instagram and their appropriations of selfies as salable objects, as tacit labor, and as an expression of contrived authenticity and reflexivity. Through these practices, Influencers achieve "subversive frivolity," which I define as the under visibilized and under estimated generative power of an object or practice arising from its (populist) discursive framing as marginal, inconsequential, and unproductive.
Why we post selfies: Understanding motivations for posting pictures of oneself

Photo sharing on various social networking sites (SNSs) has become an important part of the online social experience. SNS users utilize various types of pictures, particularly selfies (pictures one takes of oneself) to display their personalities, lifestyles, and preferences. In this study, we identified the motivations that drive selfie posting behavior and examined the roles of the selfie posting motivations and narcissism in predicting selfie posting behavior. Our findings first revealed four motivations for posting selfies on SNSs: (1) attention seeking, (2) communication, (3) archiving, and (4) entertainment. Further, results showed that the motivations of attention seeking, communication, and archiving as well as narcissism significantly predicted selfie posting intention while narcissism was the only significant predictor of selfie posting frequency. In light of these findings, areas for future research are discussed.
Instagrammatics and digital methods: studying visual social media, from selfies and GIFs to memes and emoji

Visual content is a critical component of everyday social media, on platforms explicitly framed around the visual (Instagram and Vine) on those offering a mix of text and images in myriad forms (Facebook, Twitter, and Tumblr) and in apps and profiles where visual presentation and provision of information are important considerations. However, despite being so prominent in forms such as selfies, looping media, infographics, memes, online videos, and more, sociocultural research into the visual as a central component of online communication has lagged behind the analysis of popular, predominantly text driven social media. This paper underlines the increasing importance of visual elements to digital, social, and mobile media within everyday life, addressing the significant research gap in methods for tracking, analysing, and understanding visual social media as both image based and intertextual content. In this paper, we build on our previous methodological considerations of Instagram in isolation to examine further questions, challenges, and benefits of studying visual social media more broadly, including methodological and ethical considerations. Our discussion is intended as a rallying cry and provocation for further research into visual (and textual and mixed) social media content, practices, and cultures, mindful of both the specificities of each form, but also, and importantly, the ongoing dialogues and interrelations between them as communication forms.
Modeling and analysis for mobile application services: The perspective of mobile network operators

The success of Apple's App Store has motivated many mobile network operators (MNOs) to embrace the application store. However, finding a successful strategy that provides meaningful differentiation in an increasingly competitive mobile application market is a great challenge for MNOs. This research treats the mobile application service as a two sided market and develops a system dynamics model to understand the diffusion behavior of mobile application services. Choice based conjoint analysis is used to collect multi attribute preference data of end users and developers in order to understand how they select application store service offerings in Taiwan's mobile application market. We found that under the great pressure of application stores offered by mobile platform providers, MNOs have to provide services that directly attract adoption by end users and developers, because the cross side network effect is not significant. MNOs need to apply a localization strategy based on their strengths while improving their store service quality by collaborating with third party IT vendors to persuade developers and end users to adopt their stores as another "home base" We conclude that MNOs need to not only fully exploit their resources to sense and seize emerging opportunities, but also reconfigure their resources with respect to market dynamics to rebuild their core competences for sustaining their competitive advantages.
System integration: Application towards autonomous navigation in cluttered environments
Venue: 2016 IEEE/SICE International Symposium on System Integration (SII)

This paper presents the hardware software system integration of an intelligent mobile robot for efficient navigation tasks in cluttered indoor environments. An omnidirectional robotic platform with communication over EtherCAT fieldbus is built to achieve fast control and feedback response. The software part builds upon our recently developed rapid path finding and motion planning strategy in cluttered environments containing narrow passages and 3D moving obstacle avoidance strategy. The integrated system delivers an intelligent robotic platform furnished by omnidirectional mobility and fast motion planning libraries which are advantageous for operation in complex scenarios. Simulation and experimental results show the platform's capabilities not only as a stand alone robot to perform autonomous navigation tasks but also ready for instant integration with robotic manipulators to perform manipulation tasks.
Multi View Representation Learning: A Survey from Shallow Methods to Deep Methods
Venue: ArXiv

Recently, multi view representation learning has become a rapidly growing direction in machine learning and data mining areas. This paper introduces several principles for multi view representation learning: correlation, consensus, and complementarity principles. Consequently, we first review the representative methods and theories of multi view representation learning based on correlation principle, especially on canonical correlation analysis (CCA) and its several extensions. Then from the viewpoint of consensus and complementarity principles we investigate the advancement of multi view representation learning that ranges from shallow methods including multi modal topic learning, multi view sparse coding, and multi view latent space Markov networks, to deep methods including multi modal restricted Boltzmann machines, multi modal autoencoders, and multi modal recurrent neural networks. Further, we also provide an important perspective from manifold alignment for multi view representation learning. Overall, this survey aims to provide an insightful overview of theoretical basis and state of the art developments in the field of multi view representation learning and to help researchers find the most appropriate tools for particular applications.
Wrist pulse measurement and analysis using Eulerian video magnification
Venue: 2016 IEEE EMBS International Conference on Biomedical and Health Informatics (BHI)

The wrist pulse reveals important information on the health status of a subject. The morphology and characteristics of the wrist pulse play a significant role in analyzing and diagnosing abnormal health conditions. In ancient China, measuring the wrist pulse was considered an important part of the traditional Chinese medicine. Recent studies attempted to quantify this ancient diagnostic technique and proposed several approaches to extract useful information from the wrist pulse signal. In this paper, a digital camera is used to record standard videos of the wrist. The Eulerian video magnification method is employed to detect, non intrusively, the wrist pulse signals. Then the 2 Gaussian curve modeling method is applied to analyze the signals. Spatial decomposition and temporal filtering are then used on the frames of the recorded videos. The subtle motion and color changes that correlate with the blood flowing through the artery are visualized through amplifying the filtered signal. To verify the performance of the Eulerian video magnification method for detecting the wrist pulse signal, the photoplethysmogram (PPG) pulse signal was measured. The two signals were recorded simultaneously and were compared. The experimental results demonstrate that the Eulerian video magnification method can be used to capture the characteristics of the wrist pulse signal and has the potential for predicting important cardiovascular events.
Optimal Channel and Relay Assignment in OFDM Based Multi Relay Multi Pair Two Way Communication Networks

The aim of the paper lies in maximizing the system total throughput by optimally coordinating the relay and subcarrier assignment among the multiple pairs of two way users .In this Paper, consider an OFDM based network where multiple relays help multiple pairs of source nodes to conduct Bidirectional communications. The joint optimization problem of subcarrier pairing based subcarrier assignment and relay selection for multiple two way users is considered as a combinatorial optimization problem. Hence graph based approach is implemented to establish the equivalence between the proposed problem and a maximum weighted bipartite matching (MWBM) problem. Then the problem is solved by the corresponding graph based algorithm optimally in polynomial time
Distributed WRBG Matching Approach for Multiflow Two Way D2D Networks
Venue: IEEE Transactions on Wireless Communications

Device to device (D2D) communication has great potential to improve spectrum efficiency and offload traffic for cellular networks. In this paper, we focus on a multiflow two way D2D network with decode and forward (DF) relays, coexisting with OFDMA cellular network. The spectrum sharing and relay selection are considered to minimize the outage probability of the device in D2D networks. The induced problem is a complicated probabilistic integral programming. A novel weighted random bipartite graph (WRBG) based minimum weight maximum matching (MWMM) approach will be proposed in this paper. To offload not only the traffic but also the signaling and computation overhead, the improved min sum algorithm will be applied to find the MWMM in the distributed manner with only polynomial complexity. The proposed approach enjoys an advantage that the close form approximation formulas for optimal outage probability and diversity multiplexing tradeoff can be derived by analyzing the properties of MWMM on WRBG. Both the theoretical derivations and simulation results will illustrate that the proposed approach for multiflow two way D2D networks achieves the same performance as single flow two way D2D systems. Therefore, the distributed WRBG matching approach yields not only a practical distributed algorithm, but also a simple and elegant theoretical framework for multiflow two way D2D networks.
A DNA barcode library for ground beetles (Insecta, Coleoptera, Carabidae) of Germany: The genus Bembidion Latreille, 1802 and allied taxa
Venue: ZooKeys

As molecular identification method, DNA barcoding based on partial cytochrome c oxidase subunit 1 (COI) sequences has been proven to be a useful tool for species determination in many insect taxa including ground beetles. In this study we tested the effectiveness of DNA barcodes to discriminate species of the ground beetle genus Bembidion and some closely related taxa of Germany. DNA barcodes were obtained from 819 individuals and 78 species, including sequences from previous studies as well as more than 300 new generated DNA barcodes. We found a 1:1 correspondence between BIN and traditionally recognized species for 69 species (89% Low interspecific distances with maximum pairwise K2P values below 2.2% were found for three species pairs, including two species pairs with haplotype sharing (Bembidion atrocaeruleum/Bembidion varicolor and Bembidion guttula/Bembidion mannerheimii) In contrast to this, deep intraspecific sequence divergences with distinct lineages were revealed for two species (Bembidion geniculatum/Ocys harpaloides) Our study emphasizes the use of DNA barcodes for the identification of the analyzed ground beetles species and represents an important step in building up a comprehensive barcode library for the Carabidae in Germany and Central Europe as well.
Hidden species within the genus Ocys Stephens: the widespread species O. harpaloides (Audinet Serville) and O. tachysoides (Antoine) (Coleoptera, Carabidae, Bembidiini)

Beetles previously considered to be Ocys harpaloides (Audinet Serville) from northern Africa, Spain, France, the United Kingdom, France, and Belgium belong to two species. These species can be distinguished using DNA sequences of 28S rDNA, 18S rDNA, COI, CAD, and topoisomerase I. A key, diagnoses, and images are provided to enable identification of specimens based upon characteristics of male and female genitalia, as well as microsculpture and other external structures. Through examination of the holotype of Bembidium harpaloides v. tachysoides Antoine, as well as designation of lectotypes of Bembidion harpaloides Audinet Serville and Ocys melanocephalus Stephens, and designation of a neotype for Tachis rufescens Guerin Meneville, the valid names of the two species were determined to be Ocys harpaloides and Ocys tachysoides (Antoine)