bluuebunny/crossref_metadata_2025_split huggingface dataset:
Requirements analysis for the disaster logistics inventory information system to improve the effectiveness and efficiency of handling emergency response periods
Authors: Handayani N U , Sari D P , Widharto Y , Basyir G 
Published: December 2019

AbstractThe exact specifications of system requirements are very important factors in the system development process. Any deficiency at this stage will affect the quality of the output of the information system developed. Therefore, system analysts must focus on how requirements are defined and modeled. Building a new information system is a complex process that consists of many steps that must be done before the final product is prepared for the customer. It is important to meet the needs and expectations of customers to maintain project sustainability in the future. There are several approaches to develop new information systems in which different strategies, methodology, modeling techniques or life cycles can be used. This study aims to analyze the need for the development of a website-based disaster logistics inventory information system. This research produces an analysis of information system requirements both from functional and non functional aspects. Based on functional analysis obtained the minimum specifications that must be owned by information systems, while the non-functional analysis obtained the minimum data needs to run a website-based disaster logistics inventory information system.
A dual-criterion optimization for sulfonated asphalt-assisted aqueous phase exfoliation to prepare graphene suitable for protective coating of aluminium
Authors: Yang Shengkai , Zhuo Kelei , Zhang Zezhong , Yang Jingli , Chen Yujuan , Wang Jianji 
Published: December 2019

Abstract
In this work, we aimed to prepare graphene with high concentration (C
G) or quality (indicated by I
D/I
G) by sonication-assisted exfoliation in aqueous sulfonated asphalt (SAS) solution. The highest C
G can reach 0.181 mg ml−1, while the smallest I
D/I
G is only 0.331 in the investigated range. Meanwhile, we observed that C
G and I
D/I
G changed in the opposite trend with the increase of SAS concentration, and reached their extreme values simultaneously. This was attributed to SAS’s agglomeration-induced redistribution of total energy absorbed by graphite between exfoliation and crushing. The graphene size was mainly within 100–400 nm and most of layer number was <5. The stabilization of graphene dispersion comes from the electrostatic repulsion between negatively charged SAS groups adsorbed on the graphene sheets. As the protective coating of aluminium, the graphene with relative small (for H2SO4 solution) or large (for NaCl solution) size, relative high defect content and annealing at proper temperature can improve the anticorrosion performance of graphene.
On compressive and morphological features of 3D printed almond skin powder reinforced PLA matrix
Authors: Singh Rupinder , Kumar Ranvijay , Singh Mohit , Preet Pawan 
Published: December 2019

Abstract
This paper reports the compressive, morphological and surface hardness properties of almond skin powder reinforced polylactic acid (PLA) matrix based 3D printed functional prototypes prepared by fused filament fabrication (FFF) as biomedical scaffolds. In this study the 3D printed functional parts were subjected to compression, morphological and Shore D hardness investigations. The results of this study highlight that maximum compressive strength at peak (37.712 MPa), maximum compressive strength at break (33.93 MPa) and Young’s modulus (387.80 MPa) was observed in case of sample printed at infill density 100%, infill angle 90° and infill speed 70 mm s−1 (as per ASTM D695). The maximum modulus of toughness as 3.47 MPa was observed in the case of printed sample at infill density 60%, infill angle 60° and infill speed 70 mm s−1. The results are supported by optical photomicrographs and Shore D hardness. Finally mathematical equations were developed (as empirical model) to predict different mechanical properties (based upon historical data approach) supported by Taguchi analysis.
The tracking and erosion performance of silicone rubber incorporated with novel TiO2@SiO2 core-shell nano fillers under the IEC 60587 standard
Authors: Asad Usama , Amin Salman , Aziz Muhammad Haris , Awais Muhammad , Rahman Taqi ur , Awan Hassan Ahmed 
Published: December 2019

Abstract
In last two decades a promising performance improvement in the electrical insulation materials has been reported by many researchers using different nano fillers (NFs). In recent years another type of NFs called core–shell type nano fillers have shown even more attention than ordinary NFs. The core–shell NFs are a combination of nano particle core coated with outer nano layer of different material. The core–shell NFs combine the beneficial properties of two material with in one NF. Recently a few studies have reported a considerable improvement in the dielectric properties of epoxy by utilising TiO2@SiO2 core–shell NFs. The TiO2@SiO2 particles have a core of TiO2 coated with an out layer of SiO2 at nano level. This study investigates the improvement in tracking performance of silicone rubber (SiR) using TiO2@SiO2 core–shell nano particles which has not been reported previously. The tracking immunity of low (below 1%) and high (above 1%) filler concentrations of nano TiO2@SiO2 incorporated into SiR was investigated according to IEC 60587. The results showed that an optimum percentage of 0.6 wt% of TiO2@SiO2 imparts best immunity to silicone rubber against tracking.
Structure of the interlayer between Au thin film and Si-substrate: Molecular Dynamics simulations
Authors: Plechystyy V , Shtablavyi I , Winczewski S , Rybacki K , Mudry S , Rybicki J 
Published: December 2019

Abstract
Interaction between 2, 3, 5 and 7 atomic layers of gold and a (111) silicon surface was investigated with the molecular dynamics simulation method. The simulation of the diffusion interaction between gold and silicon in the temperature range 425–925 K has been carried out. The peculiarities of the concentration changes of the interacting components and the atomic density at the boundary of two phases in the direction perpendicular to the crystalline surface were established. By means the formalism of quasi two dimensional partial pair correlation functions the atomic structure of the diffusion region was analyzed. The formation of the alloy of eutectic composition within the gold-silicon interlayer was established. It was shown that the inter-phase mixing in various temperature intervals occurred according to different diffusion mechanisms.
Tribological behavior of laser thermal sprayed Cr3C2–NiCr + 10%Ni/MoS2 composite coating on H13 hot work mould steel
Authors: Hanyun Wu , Yinmiao Ye , Haoqi Lu , Jie Yang , Dejun Kong 
Published: December 2019

Abstract
Cr3C2–NiCr+10%Ni/MoS2 composite coating was fabricated on H13 hot work mould steel using a Laser Thermal Spraying (LTS). The friction–wear behaviors of obtained coating at 25, 400 and 700 °C were investigated using a ball–on–disc wear tester, and the effect of MoS2 on the lubrication in the friction–wear process was also discussed. The results show that the average coefficients of friction (COFs) of Cr3C2–NiCr+10%Ni/MoS2 coating at 25, 400 and 700 °C are 0.68, 0.55, and 0.35, respectively, and the corresponding wear rates are 25.97 × 10–6, 30.06 × 10–6, and 11.86 × 10–6 mm3 · N–1 · s–1, respectively. The average COF and wear rate at 700 °C are the lowest among the three kinds of operation temperatures, the MoS2 particles and oxidation layer play a positive role of lubrication, which is the main factor of friction–wear reduction. The wear mechanism at 25 °C is abrasive wear, while those at 400 and 700 °C are primary abrasive wear, accompanied by oxidative wear.
Investigation on the digital image correlation and charge trap characteristics of Al/epoxy nanocomposites
Authors: Chillu Naresh , Jayaganthan R , Velmurugan R , Sarathi R 
Published: December 2019

Abstract
The influence of nanofiller on the tensile and surface charge properties of Al/Epoxy nanocomposite materials is investigated with respect to their structural composition. The formation of conductive network nearing the percolation limit with the addition of nanofiller has strongly influenced the mechanical and electrical characteristics of nanocomposites. The digital image correlation technique is employed to acquire the strain variation at the distinct locations on the tensile specimen. The load-displacement, as well as shape deformation, were analysed for the various nano filled composites. The improved tensile characteristics were achieved up to certain wt% of filler addition, beyond which the load and time required for the material fracture were reduced drastically. Likewise, the addition of filler up to 5 wt% has shown the improved charge decay characteristics viz. quicker charge decay and enhancement in shallow energy states under the applied DC voltage. The direct analogy in mechanical and electrical characteristics was formulated in terms of structural composition (defects, additives and filler) of respective materials.
Investigation on space charge dynamics and mechanical properties of Epoxy Alumina nanocomposites
Authors: Neelmani  , Suematsu Hisayuki , Sarathi Ramanujam 
Published: December 2019

Abstract
Epoxy nanocomposites with different wt% of alumina was prepared by use of high-speed shear mixer and high-frequency sonicator process, and the electrical and mechanical properties of the materials were investigated. Surface potential variation and trap distribution analysis were carried out with epoxy nanocomposites. Space charge analysis was carried out through Pulsed Electro Acoustic (PEA) technique. The dielectric constant and tan (δ) values of epoxy alumina nanocomposites were measured at different frequencies and temperatures. Contact angle and corona inception voltage caused by a water droplet showed a direct correlation. The viscoelastic properties of the epoxy nanocomposite material were examined through DMA studies. It was concluded that an increase in the supply frequency increases the storage modulus and loss modulus of the epoxy alumina nanocomposites. Glass transition temperature and activation energy increase with an increase in wt% of alumina content in epoxy resin. LIBS analysis indicates that the plasma temperature calculated increases with an increase in the wt% of alumina content in epoxy resin. Also, the measured plasma temperature and hardness of the material showed a direct correlation.
Design, simulation and optimization of a nonreciprocal guided-wave optical isolator based on Mach-Zehnder interferometer
Authors: Binandeh Dehaghani Nahid , Alizadeh Amir Hamid 
Published: December 2019

Abstract
In this paper, an interferometric optical isolator which utilizes a nonreciprocal phase shift was designed, simulated and optimized. The purpose was to develop the waveguide optical isolator which is expected to be low loss, more compatible with integrated optics and also reduces the overall costs as it is integrable to the optical sources. The isolator consists of an asymmetric Mach–Zehnder interferometer with a transverse magnetized nonreciprocal phase shifter in one waveguide and a reciprocal phase shifter in the other waveguide. In the simulation process, the Boundary Mode Analysis was used to compute propagation constants. Furthermore, the Scattering Boundary Condition method was used to make boundaries transparent for dispersed waves. The design parameters, including phase shifter length, bend radius and directional coupler length, were optimized to cut down the insertion loss in the forward direction and increase the return loss in the reverse direction and achieve a 50 dB isolation ratio.
A comparative study on the structural, dielectric, ferroelectric and magnetic properties of CoFe2O4/PbZr0.52Ti0.48O3 multiferroic composite with different molar ratios
Authors: Li Chunyue , Xu Ruicheng , Gao Rongli , Wang Zhenhua , Chen Gang , Deng Xiaoling , Cai Wei , Fu Chunlin , Li Qingting 
Published: December 2019

Abstract
Magnetoelectric composites have attracted much attentions due to their excellent multiferroic properties at room temperature. In this paper, CoFe2O4-PbZr0.52Ti0.48O3 (CFO-PZT) composite ceramics with different molar ratios (CFO/PZT = 1:4, 1:5, 1:6 and 1:7) were prepared by conventional solid reaction method. Effects of molar ratio on the structure, dielectric, ferroelectric and magnetic properties were comparatively investigated. X-ray diffraction patterns confirmed bi-phase structures of the composites, which can be indexed as CFO and PZT, no other obvious phase can be found with the limitation of the XRD resolution. Scanning electron microscopy (SEM) images show that the surface of the prepared samples is not dense enough and many pores are formed, the mean grain size is about 200 nm. The same relaxation behavior was observed in the intermediate temperature range of PZT-CFO composite ceramics. At room temperature, the dielectric constant and dielectric loss of the specimen 1:4 are the highest. The leakage current of the sample 1:4 is the lowest while the sample 1:6 has the largest value. As the CFO content in the composite decreases, both the saturation (Ms) and the remnant (Mr) magnetization decrease. Among them, the sample 1:4 presents better ferroelectric and magnetic properties, the remnant polarization is 1.13 μC cm−2, the saturation magnetization and remnant magnetization are 11.01 and 3.28 emu g−1, respectively. The sample 1:6 has the largest coercive field (945.27 Oe) while the sample 1:7 show the smallest value (681.19 Oe). Interface interaction between CFO/PZT may be applied to explain this phenomenon.
Linear-crossing metamaterials mimicked by multi-layers with two kinds of single negative materials
Authors: Guo Zhiwei , Jiang Haitao , Chen Hong 
Published: December 2019

Abstract
The topological transition of an iso-frequency contour will provide a powerful control for the interaction between light and matter. For example the transition of iso-frequency contour from an elliptical dispersion to a hyperbolic dispersion can result in many interesting optical phenomena including super-resolution, optical switching and collimation. In recently published literature, it has been shown that another transition from the metal-type hyperbolic dispersion to dielectric-type hyperbolic dispersion can be realized in the microwave circuit-based metamaterials. Particularly, the transition point corresponds to a new class of metamaterials with two intersecting linear dispersions, which can be called linear-crossing metamaterials (LCMMs). Because of the linear dispersion, LCMMs have been demonstrated to possess many unusual properties such as directional propagation and slab-focusing with a partial cloaking effect. In this perspective, we will demonstrate that the multilayered structure composed of ε-negative material and μ-negative material can mimic the LCMM in the optical regime. Based on this effective LCMM, we study the slab-imaging with a partial cloaking effect. In addition, we reveal that with the aid of LCMM, the Bessel beam with self-healing can be realized by a point source. The results show that LCMMs would be very useful in a variety of applications such as 50/50 beam splitters, focusing and non-diffraction beams.
Within-stream phenotypic divergence in head shape of brown trout associated with invasive brook trout
Authors: Závorka Libor , Larranaga Nicolas , Lovén Wallerius Magnus , Näslund Joacim , Koeck Barbara , Wengström Niklas , Cucherousset Julien , Johnsson Jörgen I 
Published: December 2019

AbstractCompetition with a non-native species can lead to morphological changes in native organisms induced by phenotypic plasticity, and by selection against individuals that do not adjust their morphology to the novel selection pressure. The morphological changes in native organisms are often associated with rapid behavioural responses to competition with the invader. However, knowledge of the interaction between the behaviour and morphology of native organisms competing with a non-native species remains scarce. Here, we investigated the effect of competition with non-native brook trout Salvelinus fontinalis on head shape of native brown trout Salmo trutta in a stream system where changes in diet and territorial behaviour of sympatric brown trout have previously been demonstrated. We found that sympatric brown trout had smaller eyes, shorter lower jaws and more terminal mouth than allopatric conspecifics. These differences in head shape were highly repeatable over a period of 12 months. Apparent survival indicated that the selection on head shape of brown trout was weaker in the sympatric than in the allopatric stretch of the stream. The results suggest that these changes reinforce divergences of foraging strategies between the allopatric and sympatric brown trout, which can negatively affect their population dynamics and trophic function in the food-web.
Mapping epileptic directional brain networks using intracranial EEG data
Authors: Li Huazhang , Wang Yaotian , Tanabe Seiji , Sun Yinge , Yan Guofen , Quigg Mark S , Zhang Tingting 
Published: December 2019

Summary
The human brain is a directional network system, in which brain regions are network nodes and the influence exerted by one region on another is a network edge. We refer to this directional information flow from one region to another as directional connectivity. Seizures arise from an epileptic directional network; abnormal neuronal activities start from a seizure onset zone and propagate via a network to otherwise healthy brain regions. As such, effective epilepsy diagnosis and treatment require accurate identification of directional connections among regions, i.e., mapping of epileptic patients’ brain networks. This article aims to understand the epileptic brain network using intracranial electroencephalographic data—recordings of epileptic patients’ brain activities in many regions. The most popular models for directional connectivity use ordinary differential equations (ODE). However, ODE models are sensitive to data noise and computationally costly. To address these issues, we propose a high-dimensional state-space multivariate autoregression (SSMAR) model for the brain’s directional connectivity. Different from standard multivariate autoregression and SSMAR models, the proposed SSMAR features a cluster structure, where the brain network consists of several clusters of densely connected brain regions. We develop an expectation–maximization algorithm to estimate the proposed model and use it to map the interregional networks of epileptic patients in different seizure stages. Our method reveals the evolution of brain networks during seizure development.
Phagocytic glioblastoma-associated microglia and macrophages populate invading pseudopalisades
Authors: Saavedra-López Elena , Roig-Martínez Meritxell , Cribaro George P , Casanova Paola V , Gallego José M , Pérez-Vallés Ana , Barcia Carlos 
Published: December 2019

AbstractHypoxic pseudopalisades are a pathological hallmark of human glioblastoma, which is linked to tumour malignancy and aggressiveness. Yet, their function and role in the tumour development have scarcely been explored. It is thought that pseudopalisades are formed by malignant cells escaping from the hypoxic environment, although evidence of the immune component of pseudopalisades has been elusive. In the present work, we analyse the immunological constituent of hypoxic pseudopalisades using high-resolution three-dimensional confocal imaging in tissue blocks from excised tumours of glioblastoma patients and mimic the hypoxic gradient in microfluidic platforms in vitro to understand the cellular motility. We visualize that glioblastoma-associated microglia and macrophages abundantly populate pseudopalisades, displaying an elongated kinetic morphology across the pseudopalisades, and are oriented towards the necrotic focus. In vitro experiments demonstrate that under hypoxic gradient, microglia show a particular motile behaviour characterized by the increase of cellular persistence in contrast with glioma cells. Importantly, we show that glioblastoma-associated microglia and macrophages utilize fibres of glioma cells as a haptotactic cue to navigate along the anisotropic structure of the pseudopalisades and display a high phagocytic activity at the necrotic border of the pseudopalisades. In this study, we demonstrate that glioblastoma-associated microglia and macrophages are the main immune cells of pseudopalisades in glioblastoma, travelling to necrotic areas to clear the resulting components of the prothrombotic milieu, suggesting that the scavenging features of glioblastoma-associated microglia and macrophages at the pseudopalisades serve as an essential counterpart for glioma cell invasion.
Up and Down States of Cortical Neurons in Focal Limbic Seizures
Authors: Yue Zongwei , Freedman Isaac G , Vincent Peter , Andrews John P , Micek Christopher , Aksen Mark , Martin Reese , Zuckerman David , Perrenoud Quentin , Neske Garrett T , Sieu Lim-Anna , Bo Xiao , Cardin Jessica A , Blumenfeld Hal 
Published: December 2019

AbstractRecent work suggests an important role for cortical–subcortical networks in seizure-related loss of consciousness. Temporal lobe seizures disrupt subcortical arousal systems, which may lead to depressed cortical function and loss of consciousness. Extracellular recordings show ictal neocortical slow waves at about 1 Hz, but it is not known whether these simply represent seizure propagation or alternatively deep sleep-like activity, which should include cortical neuronal Up and Down states. In this study, using in vivo whole-cell recordings in a rat model of focal limbic seizures, we directly examine the electrophysiological properties of cortical neurons during seizures and deep anesthesia. We found that during seizures, the membrane potential of frontal cortical secondary motor cortex layer 5 neurons fluctuates between Up and Down states, with decreased input resistance and increased firing rate in Up states when compared to Down states. Importantly, Up and Down states in seizures are not significantly different from those in deep anesthesia, in terms of membrane potential, oscillation frequency, firing rate, and input resistance. By demonstrating these fundamental similarities in cortical electrophysiology between deep anesthesia and seizures, our results support the idea that a state of decreased cortical arousal may contribute to mechanisms of loss of consciousness during seizures.