bluuebunny/crossref_metadata_2025_split huggingface dataset:
Noise suppression for MHD characterization with electron cyclotron emission imaging 1D technique
Authors: Yu G , Kramer G J , Zhu Y , Li X , Wang Y , Diallo A , Ren Y , Yu J H , Chen Y , Liu X , Cao J , Zhao B , Austin M , Luhmann N C 
Published: February 2021

Abstract
Significant noise suppression for magnetohydrodynamics (MHD) mode characterization in the spatial and spectral domain is achieved by processing two-dimensional (2D) electron cyclotron emission imaging (ECEI) data with a one-dimensional (1D) ECEI technique using a short time window (

1

ms

). The technique is applied to detect toroidal Alfven eigenmodes (TAEs) in the temporal spectrum and fit their radial envelope using the data from the DIII-D tokamak W-band 2D ECEI system. Using the data length (time window) of only 1

ms

, the 1D ECEI can clearly detect the TAEs (∼100

kHz

) on the spectrum, while similar spectrum quality requires ∼10

ms

data length with the cross power spectrum between two midplane ECEI channels. The 1D ECEI technique also effectively avoids biased fitting when resolving the fine structure of the TAE’s radial envelope. The radially spatial resolution of 1D ECEI is constrained by the finite ECE radiation volume of the ECEI receiver. With forward radiation modeling, we find the DIII-D ECEI system can sensitively measure the even parity MHD activities, for which the mode width is >15 mm, and tearing modes (odd parity MHD activities), for which the island full width is >30 mm.
A comprehensive test method for measuring actuation performance of McKibben artificial muscles
Authors: Salahuddin Bidita , Warren Holly , Spinks Geoffrey M 
Published: February 2021

Abstract
The versatile nature of artificial muscles and their applications is derived from their ability to actuate in tensile, torsional and bending modes that can mimic the action of hydraulic rams, electric motors and biomimetic curling arms, respectively. Artificial muscles have exhibited great potential for fabricating robotic components and surgical tools due to their resemblance to biological muscles; along with their high actuation force per mass. For further investigation of these artificial muscles as tensile actuators with practical applications, it is imperative to standardise methods for characterising their performance. This article applies an integrated characterization method: simultaneously measuring the free stroke of a McKibben-type hydraulic artificial muscle; the stroke while operating against an externally applied force (isotonic); the blocked force of these muscles while keeping the muscle at constant length (isometric); and the force and displacement change when the muscle operates against a return spring (variable force, pressure). This linear mechanics approach has been verified and allows the prediction of these fundamental actuation characteristics while illustrating the effects of changing external load on the muscle performance. This study proposes an important approach to assist the design of McKibben muscles when used to carry variable loads such as in exoskeletons, prosthetics, and robotics applications.
Shear band formation in magnetorheological elastomer under stress relaxation
Authors: Johari Mohd Aidy Faizal , Mazlan Saiful Amri , Ubaidillah  , Nordin Nur Azmah , Abdul Aziz Siti Aishah , Johari Norhasnidawani , Nazmi Nurhazimah , Homma Koji 
Published: February 2021

AbstractThe characteristics and behaviors of magnetorheological elastomer (MRE) within the elastic region are significantly important to demonstrate potentiality toward infinitesimal deformation in various applications. As MRE dynamically shears within an elastic region at constant small deformation, its significant consequence has long been a pending topic, hampered partly by the lack of empirical evidence. Therefore, this paper aimed to investigate the onset microscopically transformation of the MRE sample precipitated to storage modulus behavior under stress relaxation conditions. To achieve the aim, MRE with 70 wt% carbonyl iron particles was dynamically sheared at 1 Hz frequency and 0.01% strain for a designated period of test duration. The morphology evaluation of the sheared sample disclosed the development of permanent microplasticity in a very narrow region of shear bands. The deformation adequately reduced the storing energy ability of the MRE at a dominantly elastic behavior. The results revealed that the ability of MRE to store deformation energy slightly reduced by 0.3%–0.5% for the 2000 s test interval. This interesting onset phenomenon was successfully achieved, and the establishment of this early-stage deformation was undeniably important as preliminary data for catastrophic investigation at a longer duration.
Quantum enhancement to information acquisition speed
Authors: Horvat Sebastian , Dakić Borivoje 
Published: February 2021

Abstract
The speed of the transmission of a physical signal from a sender to a receiver is limited by the speed of light, regardless of the physical system being classical or quantum. In this sense, quantum mechanics can not provide any enhancement of the speed of information transmission. If instead we consider that the information needing to be transmitted is not localized at the sender’s location, but dispersed throughout space, spatial coherence might provide some enhancement. In this work, we demonstrate a quantum mechanical advantage in the speed of acquirement and transmission of information globally encoded in space. We present a task for which we prove a quadratic enhancement to the information acquisition speed using quantum information carriers with respect to their classical counterpart. Our findings can naturally be applied in situations where the information source has limited power, i.e. bounded number of signals that can be sent per unit time.
Stability of charged thin-shell and thin-shell wormholes: a comparison
Authors: Sharif M , Javed Faisal 
Published: February 2021

Abstract
In this paper, we are interested to compare the stability of geometrical structures of self-gravitating charged thin-shell and thin-shell wormholes in the presence of different types of matter distribution. For this purpose, we develop a thin-shell that connects inner Minkowski spacetime and the outer Reissner-Nordström black hole. We also develop a thin-shell wormhole from the matching of two equivalent copies of Reissner-Nordström black hole by using cut and paste approach. The equation of motion of the shell is used to observe the stability of the developed structures through radial perturbation. We assume barotropic type (generalized barotropic) and non-barotropic type (generalized phantomlike and Chaplygin gas model) matter distributions to discuss the stable configuration of the developed structures. It is found that thin-shell is more stable than thin-shell wormhole for both matter distributions with suitable choice of physical parameters.
Energy dissipation of an infinite damping beam supported by saturated poroelastic halfspace
Authors: Liu Kuan , Hu Weipeng , Gao Chong , Ye Wanjun 
Published: February 2021

Abstract
Reproducing the dissipative effects in the non-conservative dynamic system numerically is one of the challenges in the numerical method because that, both the artificial dissipation of the numerical method and the real dissipation of the system are contained in the numerical results. In this paper, a complex structure-preserving numerical approach with tiny artificial dissipation is developed to investigate the energy dissipation in the road-foundation interaction system subjected to a moving load. Simplifying the road as an infinite damping beam with a finite width and the foundation as a saturated poroelastic halfspace with viscosity, the nonlinear coupling damping dynamic model is established. The energy dissipation laws of the road-foundation interaction system are revealed with different parameters of the moving load in the numerical simulations by the complex structure-preserving approach. The complex structure-preserving approach developed in this paper provides a new way to analyze the coupling dissipative problems. In addition, the energy dissipation laws obtained from the numerical results give some suggestions on the road design and the foundation design in engineering.
Pair production in asymmetric Sauter potential well
Authors: Sawut Adiljan , Dulat Sayipjamal , Xie B S 
Published: February 2021

Abstract
Electron-positron pair production in asymmetric Sauter potential well is studied, where the potential well has been built as the width of the right edge fixed but the left side of the well is changeable at different values. We study the momentum spectrum, the location distribution and the total pair numbers in this case of asymmetric potential well and compare them with the symmetric case. The relationship between created electron energy, the level energy in the bound states and the photon energy in the symmetric potential well is used to the studied problem for the created electrons in the asymmetric potential well and its validity is confirmed by this approximation. By the location distribution of the electrons we have also shown the reason why the momentum spectrum has an optimization in the asymmetric well compared with the symmetric one.
Proton-halo breakup dynamics for the breakup threshold in the ε
0 → 0 limit
Authors: Mukeru B. 
Published: February 2021

Abstract
Proton-halo breakup behavior in the

limit (where

is the ground-state binding energy) is studied around the Coulomb barrier in the

reaction for the first time. For practical purposes, apart from the experimental

binding energy of 137 keV, three more arbitrarily chosen values (1, 0.1, 0.01 keV) are considered. It is first shown that the Coulomb barrier between the core and the proton prevents the

system from reaching the state of an open proton-halo system, which, among other factors, would require the ground-state wave function to extend to infinity in the asymptotic region, as

. The elastic scattering cross section, which depends on the density of the ground-state wave function, is found to have a negligible dependence on the binding energy in this limit. The total, Coulomb and nuclear breakup cross sections are all reported to increase significantly from

to 1.0 keV, and converge to their maximum values as

. This increase is mainly understood as coming from a longer tail of the ground-state wave function for

keV, compared to that for

keV. It is also found that the effect of the continuum-continuum couplings is to slightly delay the convergence of the breakup cross section. The analysis of the reaction cross section indicates a convergence of all the breakup observables as

. These results provide a better sense of the dependence of the breakup process on the breakup threshold.
Text Mining Analysis on Users’ Reviews for News Aggregator Toutiao
Authors: Li Jia , Wang Bifeng , Ni Alexandra Jingsi , Liu Qian 
Published: February 2021

Abstract
This paper intent to improve consumer communication by text mining analysis with users’ reviews. The news aggregator we focus on is: Toutiao, known as “today’s headlines” in Chinese. It is the top news aggregator application run by Bytedance company in China. It utilizes AI algorithms to provide numerous news feed for its users. As new technologies are shaping the business strategy studies as well as online communication analysis, it requires innovative and effective analyses of unconventional data, such as the 12,290 online reviews on Toutiao we collected from Apple’s App Store. Through the LDA topic modelling and sentiment analysis, our research has identified three major negative complains the consumers have regarding Toutiao application, namely: too many unsolicited advertisements, contents (vulgar content, time consuming video, privacy and copyrights infringement issue) and incompatibility with the latest Apple digital devices.
Study on HPLC Fingerprint of Atractylodes macrocephala and Atractylodes macrocephala dispensing granules
Authors: Lv Lijuan , Wang Xiangpei , Zhong Ke , kong Juan , Zhang Lingling , Yang Xiaosong , Zhang Yanyan , Wu Hongmei 
Published: February 2021

Abstract
Atractylodes macrocephala as a commonly used Chinese medicinal materials, its average annual demand is about 7000 tons. Therefore, it is necessary to develop and utilize Atractylodes macrocephala. Atractylodes macrocephala dispensing granules are widely favored by patients because of its accuracy and convenience in prescription formulation, but its quality control needs to be improved. High performance liquid chromatography (HPLC) can be used to separate the components of traditional Chinese medicine dispensing granules, and significantly improve the accuracy of measuring of effective component. Based on this, HPLC fingerprints of Atractylodis Macrocephalae and dispensing granules were established in this study. Taking the characteristic spectrum as the control, and evaluating the correlation of the medicinal materials and the formula granules. Analysis showed that Atractylodes macrocephala and formula granules showed 7 common characteristic peaks, presenting a good correlation. It reflected the overall appearance of multi-component of Atractylodes macrocephala and formula granules, and provided reference for quality control of Atractylodes macrocephala dispensing granules.
Research on Computer Network Security Emergency Response Systematization
Authors: Yang Xue , Zhu Ai’nan 
Published: February 2021

Abstract
with the acceleration of information process, computer information system and network has become an important social infrastructure. Based on the study of the basic theory, technology and application of computer network security emergency response, this paper focuses on the relevant strategies to guide the establishment of effective computer network security emergency response mechanism, analyzes the strategy composition, function object and action process of the system framework, and designs the framework of computer network security emergency response strategy system.
Retraction: 3D printed cellulose-based high-efficiency oil-water separation mesh (IOP Conf. Ser.: Earth Environ. Sci.
514 022088)
Authors: Zhang Xinqi , Wu Yifei , Gao Yuan 
Published: February 2021

This article has been retracted by IOP Publishing at the request of the authors, who have identified errors in both the measurements and treatment processes of the mesh samples. These errors suggest the results and conclusions presented in the article may not be reliable. IOP Publishing has investigated in accordance with the Committee for Publication Ethics (COPE) guidelines and it was agreed the article should be retracted. The authors apologise to the readers, conference organisers and IOP Publishing for these errors.
Retraction published: 25 February 2021
Performance evaluation of a major thermal power plant in Nigeria
Authors: Babatunde Damilola E. , Anozie Ambrose N. , Omoleye James A. , Odejobi Oludare J. 
Published: February 2021

Abstract
Electric power is the bedrock of sustainable development in modern society. The demand for its adequate and reliable supply at a very competitive price is continuously increasing with population increase and the industrial revolution. A significant limitation to meeting this demand, is the inefficient operation of several of the existing power plants, resulting in their inability to generate electricity equivalent to their installed capacity. In this study, the exergy based performance evaluation of a major power plant in Nigeria was conducted to identify opportunities for thermodynamic improvement. Historical data of the plant was fed into HYSYS 8.8 to simulate its operations and obtain necessary thermodynamic data for assessing its performance. With the aid of codes embedded in HYSYS and the use of Ms Excel, the synthesized plant’s thermodynamics data was used for its performance evaluation. Components-wise evaluation revealed that apart from the turbines, exergy efficiencies were lower than energy efficiencies. The overall energy efficiency of the plant was found to be 33.19% while the corresponding exergy efficiency was 31.94%. The boiler was identified as the unit with the highest irreversibility and most significant contributor to overall plant’s inefficiency. It is posited that adequate knowledge of the effect of changes in operating parameters and load variation on performances will be handy in addressing inefficiencies in the boiler and other components of the plant.
Investigation of groundwater contamination from leachate migration: a case study of Bowen University dumpsite, Nigeria
Authors: Ajani O. O. , Adagunodo T. A. , Adeniji A. A. , Fashae B. , Omeje M. , Adewoyin O. O. 
Published: February 2021

Abstract
A microstudy of soil physical properties in combination with geoelectric delineation were adopted for the evaluation of groundwater contamination prospect from leachate migration at Bowen University dumpsite location. Samples of soil were collected from five different locations, with five locations within the dumpsite and one control sample which is 200 m far away from the dumpsite locations. A core sampler which is attached to the soil auger is used to obtain each sample within 60 cm depth. Each sample is collected into a sample bag and properly labeled for laboratory analysis. Schlumberger electrode configuration was employed for the survey spread to delineate total of four (4) Vertical electrical sounding (VES) points with electrode spacing varying 60 to 100 m. This was done to obtain resistivity, thickness and depth within the dumpsite location. The results of the average value of the soil properties between the control and the dumpsite are compared such that the soil properties for control site reveal a bulk density (BD) of 1.45 g/cm3, particle density (PD) of 2.63 g/cm3 and porosity (PO) of 44.90%, respectively. Whereas, the mean soil properties of the dumpsite show that BD is 1.35 g/cm3, PD is 2.93 g/cm3, and PO is 54.07%, respectively. This signifies that the control location has high BD, low PD and low PO, while the dumpsite reveals an inverse of the control results. Also, the results from the interpreted VES data reveal the prospect of migration of contaminants from the topsoil to the alluvium, which could further percolate to the aquifer with time. It could be concluded that groundwater contamination is feasible within the study area, since an alluvium and porous soils could permit leachate migration to the aquifer.
Geochemical characteristics and genesis of crude oils with complex physical properties in the eastern part of the southern gentle slope of Dongying Sag
Authors: Liu Ge , Niu Zicheng , Wang Xiuhong , Liu Haining , Wang Ru , Wang Juan 
Published: February 2021

Abstract
The crude oil in the eastern part of the southern gentle slope of Dongying Sag has complex physical properties, and various crude oils with different properties such as heavy oil, high sulfur oil, and high wax oil have developed. The complexity of the physical properties reflects the influence of the source rock properties, crude oil migration process, and secondary alteration after accumulation on crude oil characteristics. Through systematic analysis of geochemical data, the formation mechanism of crude oil with these special physical properties has been clarified. The result of hydrocarbon generation at an early stage from source rocks rich in high-sulfur kerogen deposited in a euxinic waterbody is the cause of high-sulfur crude oil with low maturity in Wangjiagang oil field. While the shallow reservoir burial depth and the resulting biodegradation is the mechanism of the formation of high-sulfur crude oil in Le’an oil field with higher maturity. Biodegradation is the main mechanism of the formation of heavy oil, and the recharge of hydrocarbons into the degraded crude oil reservoirs leads to the complication of crude oil density. Both the hydrocarbon generation of organic matter rich in terrestrial higher plants and phase-controlled fractionation during hydrocarbon migration lead to the generation of high wax crude oil.
Gas Slug Compound Flooding in Low and Ultra-low Permeability Layer
Authors: Chen Taoping , Sun Wen , Bi Jiaqi , Zhao Bin , He Ru 
Published: February 2021

Abstract
In order to improve the recovery of gas slug compound flooding in low permeability and ultra-low permeability reservoirs, two methods of the carbon dioxide-nitrogen and the rich gas-nitrogen compound flooding are studied. The results show that in low permeability and ultra-low permeability reservoirs, the use of a single injection of a reasonable pre-slug(carbon dioxide or rich gas) + subsequent nitrogen slug compound flooding can reduce the size of the pre-slug, give full play to the advantages of both the pre-slug and nitrogen, and obtain a better flooding efficiency. Under the same conditions, the recovery of the ultra-low permeability cores used in this experiment is 7.6% higher than the recovery of the low permeability cores on average. However, since the reasonable size of the rich gas pre-slug is 0.6 PV, twice as much as the reasonable size of the carbon dioxide pre-slug, and the price of unit volume of the rich gas slug is 1.82 times as much as the price of the carbon dioxide slug under the condition of injection, the final input-output ratio of the carbon dioxide-nitrogen compound flooding is 2.0∼2.69 times as much as that of the rich gas-nitrogen compound flooding.
Establishment of free surface related multiple migration method based on PSPI theory
Authors: Zou Jiaqi 
Published: February 2021

Abstract
Seismic exploration will be affected in many ways, leading to the phenomenon of missing seismic data. Conventional imaging cannot accurately reflect the structure of underground media. This paper is based on the data to data migration which purpose of this method is used to compensate for the missing seismic data. The illumination of the underground media is reduced by rarefying the shot gathers. The seismic data containing primaries and free-surface related multiples are employed in upward and downward extrapolation simultaneously. And the field data has been transformed into frequency domain. Finally, using cross-correlation imaging conditions, the shallow imaging effect obtained is consistent with conventional imaging, and the deep imaging can provide more abundant imaging information. This method has a high imaging accuracy and does not require multiples prediction processing, which greatly reduces the operation process and avoids the possible errors of multiples prediction. Meanwhile, it uses multiples imaging to enhance the processing capacity of underground structures and obtain more structural information. In the case of missing seismic data, the numerical simulation test shows that the data to data migration imaging method can play a key role in the imaging results.
Research on Multi-scale Segmentation of Remote Sensing Images of Typical Feature in Rare Earth Mining Area
Authors: Zhiqiang Liu , Peihong Li , Yimin Yuan 
Published: February 2021

Abstract
Remote sensing image information extraction is very important for mine surface monitoring. And Image segmentation is the key technology for remote sensing image information extraction. In this paper, taking the GF-1 image data of a rare earth mine in southern Jiangxi as an example, using the scale comparison method combined with ESP tools to determine the optimal segmentation scale of the target feature quickly, and evaluate the classification results of mine images. The results show that the accuracy can be improved when compared with the traditional single-scale segmentation, and it can provide a new solution for the extraction of remote sensing image information from the mine surface.