bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pancreas segmentation with probabilistic map guided bi-directional recurrent UNet
Authors: Li Jun , Lin Xiaozhu , Che Hui , Li Hao , Qian Xiaohua 
Published: April 2021

Abstract
Pancreas segmentation in medical imaging is of great significance for clinical pancreas diagnostics and treatment. However, the large population variations in the pancreas shape and volume cause enormous segmentation difficulties, even for state-of-the-art algorithms utilizing fully convolutional neural networks (FCNs). Specifically, pancreas segmentation suffers from the loss of statement temporal information in 2D methods, and the high computational cost of 3D methods. To alleviate these problems, we propose a probabilistic-map-guided bi-directional recurrent UNet (PBR-UNet) architecture, which fuses intra-slice information and inter-slice probabilistic maps into a local 3D hybrid regularization scheme, which is followed by a bi-directional recurrent optimization scheme. The PBR-UNet method consists of an initial estimation module for efficiently extracting pixel-level probabilistic maps and a primary segmentation module for propagating hybrid information through a 2.5D UNet architecture. Specifically, local 3D information is inferred by combining an input image with the probabilistic maps of the adjacent slices into multi-channel hybrid data, and then hierarchically aggregating the hybrid information of the entire segmentation network. Besides, a bi-directional recurrent optimization mechanism is developed to update the hybrid information in both the forward and the backward directions. This allows the proposed network to make full and optimal use of the local context information. Quantitative and qualitative evaluation was performed on the NIH Pancreas-CT and MSD pancreas dataset, and our proposed PBR-UNet method achieved similar segmentation results with less computational cost compared to other state-of-the-art methods.
Coherent radiation of active Josephson traveling-wave antennas
Authors: Galin M А , Shereshevsky I A , Vdovicheva N K , Kurin V V 
Published: April 2021

Abstract
The dynamics of large superwavelength open systems which are free-standing multi-wire lines with a large number of Josephson junctions, DC bias batteries and other lumped elements is analyzed using direct numerical simulation. Such systems represent the simplest version of the active Josephson antennas proposed in our earlier studies and show promise as terahertz and subterahertz radiation sources. We have studied dependences of the radiation characteristics on the antenna geometry, number of junctions, DC bias current and the lumped elements position and parameters. Detailed simulation results reveal a multitude of phase transitions between the dynamical states, which differ in the number of Josephson junctions synchronized by the excited waves of current and, hence, in the radiation power emitted into open space also as in radiation patterns. It is shown that, in the absence of noise, the Josephson antennas can emit completely coherent radiation.
Hubbard models and state preparation in an optical Lieb lattice
Authors: Flannigan S , Madail L , Dias R G , Daley A J 
Published: April 2021

Abstract
Inspired by the growing interest in probing many-body phases in novel two-dimensional lattice geometries we investigate the properties of cold atoms as they could be observed in an optical Lieb lattice. We begin by computing Wannier functions localised at individual sites for a realistic experimental setup, and determining coefficients for a Hubbard-like model. Based on this, we show how experiments could probe the robustness of edge states in a Lieb lattice with diagonal boundary conditions to the effects of interactions and realise strongly correlated many-body phases in this geometry. We then generalise this to interacting particles in a half-filled 1D Lieb ladder, where excitations are dominated by flat band states. We show that for strong attractive interactions, pair correlations are enhanced even when there is strong mixing with the Dirac cone. These findings in 1D raise interesting questions about the phases in the full 2D Lieb lattice which we show can be explored in current experiments.
Phase, AC conductivity and dielectric properties of Indeno[1,2-b]flourene-6,12 dione thin film as a function of frequency and temperature
Authors: El-Denglawey A , Qashou Saleem I , Darwish A A A , El-Zaidia E F M 
Published: April 2021

Abstract
Indeno [1,2-b] fluorene-6,12dione (Indeno-fluorene) films were deposited on glass substrates by thermal evaporation technique. x-ray diffraction of the Indeno-fluorene films shows amorphous phase nature. Alternating current, AC conductivity was studied as a function of frequency and temperature within a range of 40 Hz-8 MHz and 303–423 K, respectively. The calculated value of the electron density of states (N(EF)) near the Fermi states at room temperature and frequency of 500 kHz was 8.73 × 1023 eV−1cm−3. In addition, parts of dielectric constant-real and imaginary were investigated at different temperatures. The relaxation process, relaxation time, activation energy, Coulomb height potential, and the extensive localized electronic states were studied. The normalization spectra of electric modulus elucidate that Indeno-fluorene thin films can be expounded by a non-Debye type of relaxation. The obtained data were discussed in terms of correlated barrier hopping model (CBH) and candidate Indeno-fluorene films for solar cells, transistor units, and electronic applications.
IceCube constraints on violation of equivalence principle
Authors: F.G. Fiorillo Damiano , Mangano Gianpiero , Morisi Stefano , Pisanti Ofelia 
Published: April 2021

Abstract
Among the information provided by high energy neutrinos, a promising possibility is to analyze the effects of a Violation of Equivalence Principle (VEP) on neutrino oscillations. We analyze the recently released IceCube data on atmospheric neutrino fluxes under the assumption of a VEP and obtain updated constraints on the parameter space with the benchmark choice that neutrinos with different masses couple with different strengths to the gravitational field. In this case we find that the VEP parameters times the local gravitational potential at Earth can be constrained at the level of 10-27. We show that the constraints from atmospheric neutrinos strongly depend on the assumption that the neutrino eigenstates interacting diagonally with the gravitational field coincide with the mass eigenstates, which is not a priori justified: this is particularly clear in the case that the basis of diagonal gravitational interaction coincide with the flavor basis, which cannot be constrained by the observation of atmospheric neutrinos. Finally, we quantitatively study the effect of a VEP on the flavor composition of the astrophysical neutrinos, stressing again the interplay with the basis in which the VEP is diagonal: we find that for some choices of such basis the flavor ratio measured by IceCube can significantly change.
When will an elevator arrive?
Authors: Feng Zhijie , Redner S 
Published: April 2021

Abstract
We present and analyze a minimalist model for the vertical transport of people in a tall building by elevators. We focus on start-of-day operation in which people arrive at the ground floor of the building at a fixed rate. When an elevator arrives on the ground floor, passengers enter until the elevator capacity is reached, and then they are transported to their destination floors. We determine the distribution of times that each person waits until an elevator arrives, the number of people waiting for elevators, and transition to synchrony for multiple elevators when the arrival rate of people is sufficiently large. We validate many of our predictions by event-driven simulations.
Nonsingular matrix as private key on ElGamal cryptosystem
Authors: Maxrizal  , Irawadi Syafrul 
Published: April 2021

Abstract
The ElGamal cryptosystem is an asymmetric cryptosystem using commutative algebra. Currently, applications of commutative algebra are very vulnerable to attack. For this reason, some experts have developed a public-key cryptosystem based on non-commutative algebra. This study proposes the ElGamal cryptosystem using a matrix as the private key to guarantee the non-commutative algebra concept. The result of the cryptosystem is still working on a matrix of a specific size. The results show that we can modify the key generating algorithm, encryption, and description algorithms so that the proposed system can work.
Classification of Damaged Road Types Using Multiclass Support Vector Machine (SVM)
Authors: Sulistyaningrum D R , Putri S A M , Setiyono B , Ahyudanari E , Oranova D 
Published: April 2021

Abstract
Damage roads had been disturbed by social activities and involved in traffic accidents. Identification and classification of the types of defected road are required to minimize its impact and before repairs. Digital image processing technology can identify and classify the type of damaged roads automatically. In this study, the classification of defected roads is automatic with a multiclass Support Vector Machine(SVM). There are three classes in the classification process, namely, alligators, potholes, and cracks. The process of recognizing defected roads uses a multiclass SVM classification model with polynomial and Gaussian kernel function and One Vs. All strategy and uses a cell size of 16 × 16 pixels during the Histogram of Oriented Gradients (HOG) feature extraction process. and produces an accuracy value of 78,85%.
Similarity Transformation of Discrete Part Production Lines
Authors: Chen Hui , Li Lei , Zhang Zhichao 
Published: April 2021

Abstract
In order to improve the computational efficiency of models of production lines with unreliable machines, we propose the similarity transformation method by adjusting the design parameters, such as times between machine failures, times to repair and buffer capacities, in an equal proportion. It is found that the system throughput remains almost unchanged under the similarity transformation. The typical manufacturing system, serial production line, is taken as an example to verify the proposed method. Theoretical analysis and numerical experiments have been performed to confirm the feasibility and effectiveness of the method. The results show that the throughput error is no more than 5% and the calculation time is much less than that of the original model. Therefore, it is helpful to apply the similarity transformation method to large production line models to reduce computational complexity.
Temperature Regulation of Photovoltaic Cells using Phase Change Material Heat Sinks Integrated with Metal Foam
Authors: Al-Migdady Ahmad K. 
Published: April 2021

Abstract
This article investigates the cooling performance of Phase Change Material “PCM”-heat sinks integrated with porous metal that are attached to PV cells. Numerical simulations were carried out for a 2-dimensional configuration of a PCM-based heat sink subjected to uniform heat flux of 900W/m2 on the upper side and heat convection takes place at all other sides with a uniform convective heat transfer coefficient of 10 W/m2.°C. Two different PCMs were considered (n-Eicosane and RT44HC) and three values of metal foam porosity “e” were chosen as well (ε = 1.00, 0.97 and 0.90, where ε = 1.00 refers to no-metal foam case). Results showed that addition of metal foam enhances the cooling performance of PCM-based heat sinks. In the n-Eicosane based heat sinks, the PV-surface temperature was reduced by 6.31 °C and 7.00 °C for the 97% and 90% porosities respectively when compared to the no-metal foam case (100% porosity). On the other hand, in the RT44HC based heat sinks the PV-surface temperature was reduced by 5.50 °C and 6.15 °C for the 97% and 90% porosities respectively when compared to the no-metal foam case (100% porosity).
Numerical Simulation of Kinetic Kill Vehicle Impacting Biological Submunition Payloads
Authors: Zan Yang , Zheng Yuan-feng , Liu Zhen-yang , Cai Yi-qiang , Wang Hai-fu , Guo Huan-guo 
Published: April 2021

Abstract
Damage behavior of biological submunition payloads directly impacted by Kinetic Kill Vehicle (KKV) is studied by numerical simulation based on Autodyn-3D software. Target characteristics and structure equivalent model of the biological submunition payload and KKV are analyzed and obtained. Three factors including hit-point position, strike angle and KKV’s diameter are chosen to study the damage behavior. Three types of damage behaviors of biological submunitions, including deformation, partial disintegration and completely disintegration occur in simulation. As for influencing factors, hit-point position has little influence on damage effect when hit-point is not at either ends. While number of damaged submunitions firstly increases and then decreases with increasing of strike angle when hit-point is near the center of the submunition payload. For the given KKV, number of damaged submunitions increases significantly at the strike angle of 60° compared with the vertical impact. With increasing of the KKV’s diameter, number of completely disintegrated submunitions increases dramatically and the damage degree and deformation range of the payload skin gradually increases. Research in this paper could provide useful references for the optimization structural of KKV, selection of terminal encounter condition, and assessment of kinetic midcourse anti-missile interception.
Numerical Simulation of the Effects of Strain Hardening Exponent with and without Strain Rate Sensitivity of Material on Normal Elastic Plastic Impact
Authors: Kriflou Taoufik , Rachik Mohamed , Azrar Lahcen , El Bikri Khalid 
Published: April 2021

Abstract
The material behavior selection is an important factor governing the structural response analysis of transverse impact problems, such as impact force, indentation and local elastic plastic deformation. In the present paper, the effects of strain hardening exponent (n) and strain rate sensitivity (m) on the transient response were investigated for low impact velocity by the aid of finite element simulation using the Abaqus Software. Investigated parameters are impact force histories, indentation and plastic strain (PEEQ). Results showed that the effect of n values on required parameters is more pronounced, unlike strain rate sensitivity which has not a significant influence. As well, material behavior selection is essential for an accurate local plastic strain analysis.
Computational Modeling of the Corrosion Process and Mechanical Performance of Biodegradable Stent
Authors: Tao JiaYu , Cheng Jie , Zhao GuTian , Hu Xue , Gu XingZhong , Su JunJie 
Published: April 2021

Abstract
Magnesium alloy stents have drawn increasing research interest in recent years owing to their biodegradable behaviors. As dissolved by corrosion, mass of the magnesium alloy stents decreases with time, allowing mechanical load to gradually transfer to the surrounding tissues. This work aimed to develop a numerical model based on Continuum Damage Mechanics (CDM) combining pitting corrosion and stress corrosion crack to better predict the degradation behavior of biodegradable magnesium alloy stent. It was applied in coronary stents through finite element method compared with the use of single pitting corrosion model. The results indicated that addition of stress corrosion attack accelerated the degradation rate and support performance loss of stent compared with single pitting corrosion. The proposed model would bring new sights to simulation and serve the design of magnesium alloy stents.
Research on the Feasibility Verification Based on Continuous Vortex Ring Generator and the Matching Degree of Device Parameters
Authors: Tian Hao-Yu , Xu Lin , Hou Bao-Shen , Huang Tao , Huang Xin-Tong , Liu Jia-Qi , Dai Lu , Wu Yong-Jia 
Published: April 2021

Abstract
This paper proposes a new type of continuous vortex ring generator, which can significantly increase vortex ring generators’ ventilation by studying the matching degree of device parameters. This paper uses the model proposed by Gharib analysis, and the dimensionless circulation of the vortex ring measured by the vortex profile method to explore the properties of the vortex ring. In this paper, by studying the generation principle of a vortex ring in which a dynamic fluid flows through mechanical drainage and alternately ejected from a tapered spout and an annular spout, explore the best conditions for the continuous vortex ring. The research results show that a section of static fluid with a radial restriction is driven by the same dynamic fluid with a certain speed, and the fluid-carrying capacity of the vortex ring increases as the length to diameter ratio increases, after reaching a certain length no more noticeable change. An annular spout is equipped with a guide cylinder, and its clearance coefficient is within a specific reasonable range. When the annular spout ejects an airflow whose length-to-diameter ratio is in a specific functional relationship with the clearance coefficient, a high-quality vortex ring can be produced.
Thermal Environment Control of Buildings using Installation of Plants and Metal Panels on Brick Walls
Authors: Ornam Kurniati , Triyadi Sugeng , Wonorahardjo Surjamanto , Sutjahja Inge M. , Martonohadi Prameswara , Assegaf Sufiyah , Kimsan Masykur 
Published: April 2021

Abstract
One of the thermal behaviors of bricks on building walls might store heat in large amounts and delay it to be re-released. This performance will consequently prevail over the building’s environment, comprising the Urban Heat Island (UHI) phenomenon. Hence mitigation technology for controlling and managing heat gain is required to reduce the effect of UHI. Various research has studied this phenomenon mainly from orientation and the several types of wall insulation for sundry types of climates. However, it has not been significantly scrutinized from the green wall and metal panel wall viewpoint. This study aims to discern the thermal behavior of regular building brick walls using 3 (three) types of walls, i.e., conventional brick walls, metal-panel wall technology such as Aluminum Composite Panel (ACP) without air gap, and green walls technology by planting the vines in a trellised container with a sandy loam substrate. ENVI-met V4 software is performed for simulation by modeling a house building measuring 8 meters long, 6 meters wide, and 5 meters high. Metal panels and green walls are installed on all brick walls on the building’s west and east sides. The parameter observed was the surface temperature of walls and the air temperature pattern by introducing fixed wind speed (0,1 m/s). In the daytime, the results showed that using the technology intervention with ACP provided better results in terms of lower surface temperature than other types with a 0,6 – 6,7 % difference due to its conductive properties in storing heat. Moreover, green wall intervention utilizing vegetation yields better performance in the nighttime with a 0,3 – 3% difference as the Ivy Hadera is holding the heat during that time. Green wall intervention also evinces significant temperature rising at 09.00 – 16.00 since the Ivy Hadera vegetation has relatively sparse leaf space; hence there is a considerable amount of heat radiation reaching through the walls, and there is evapotranspiration of the vegetation causing heat release to the atmosphere.
Thermal Comfort Of The Outdoor Transition Space In the Dean’s Office Building
Authors: Ramawangsa Panji Anom , Prihatiningrum Atik , Seftyarizki Debby 
Published: April 2021

Abstract
The increase in the transmission of the COVID-19 disease, creating an effort to prevent transmission by controlling total of space users in the Dean’s Office Building, University of Bengkulu to avoid overcrowding users of space in buildings. The control has an impact on the increasing number of space users in the transition space of outdoor (terraces, hallways, corridors) in the eight Dean’s Office Buildings. The thermal comfort of the outdoor transition space needs to be considered because the post-pandemic adaptation behavior causes the change in the function of the transition area as buffer between outdoor and indoor spaces, is currently becoming a waiting room for entering buildings with uncertain waiting times. In addition, University of Bengkulu is located in coastal area with air temperatures during the day between 30 °C- 34 °C and wind speed ranging from 0-2,2 m/s. The purpose of this research is to determine the perception of thermal comfort of space users in the transition space, Dean’s Office Building, University of Bengkulu. Measurement data in the form of air temperature, air humidity, and wind speed at the peak of the dry month were carried out at 08.00-16.00 for 10 working days and interview data on the perception of thermal comfort of space users. Interview and measurement data will be inputted on the Ray-man measuring instrument to obtain the PET, PMV, SET values.
Development of Green Building Ranking Based on Stakeholders Values Using the AHP
Authors: Muchlis Aulia Fikriarini , Larasati Dewi , Sugeng Triyadi S , Hanifah Yulita , Wardhani Anedya , Ekawati Novya 
Published: April 2021

AbstractGreen buildings conserve precious natural resources and increase our standard of living. Green building, in principle, seeks to reduce the negative impact on our atmosphere and natural environment. This effort is marked by the existence of a green building rating. However, currently, not many construction stakeholders have used this rating system. Therefore, this paper attempts to illustrate the critical points of the green building concept based on stakeholder knowledge and, at the same time, offers new ranking criteria. This paper then chooses a general analytic approach, including literature on green buildings’ ranking and Indonesian religious values. AHP was selected as a method in this study to provide an overview of how much stakeholder confidence for spiritual values in green criteria. This study shows different weight values on the requirements for green buildings based on religious values and Greenship. Most of the stakeholders chose the Water criterion at 27.66% as a substantial point value for realizing a sustainable site, while in Greenship, almost all the criteria have the same weight. Confidently, the criteria and value weights used in realizing a sustainable site align with religious values because the implementation will be more straightforward.
Energy Efficiency in Church Building Based on Sefaira Energy Use Intensity Standard
Authors: Nabilah Aisyah , Devita Hanna Putri , Halen Yohannes Van , Jurizat Aldissain 
Published: April 2021

Abstract
The occupancy for buildings with religious purposes has infrequent periods of use that are near full occupancy to minimal or no occupancy. Thus, energy usage in buildings such as churches has lower overall energy intensity than other commercial buildings. The purpose of this study aims to analyze the use of energy in a church building by using Sefaira extension in SketchUp modeling application and to provide solutions so that the building’s Energy Use Intensity (EUI) value can be within Sefaira standard. This research was conducted by simulating a church building model into Sefaira application, which includes aspects of the assessment, namely building orientation, wind, openings, and material. This study describes the energy efficiency of buildings by changing the materials that are more optimal to respond to the heat received by the building. Changes applied to buildings by optimizing materials such as the application of insulations, ventilation, and solar screen reduce the value of Solar Heat Gain Coefficient (SHGC). This change significantly reduces the energy consumption from 125 kWh/m2/yr to 67 kWh/m2/yr in the building.