bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evolution of bulk magnetic structure in MnSi thin film: a soft x-ray magnetic circular dichroism study
Authors: Jena S , Choi W-Y , Gardner J , Jung M H , Srivastava S K , Verma V K , Amemiya K , Singh V R 
Published: June 2023

Abstract
Skyrmionic materials have exceptionally stable topologically protected chiral structures, the B20 helimagnetic MnSi is regarded as the best contender in this category. A non-centrosymmetric polycrystalline, MnSi thin films were fabricated on a c-sapphire substrate using a radio-frequency magnetron sputtering method. The structural and optical characteristics of the topological MnSi were examined using x-ray diffraction, Ultraviolet-visible spectroscopy, and Fourier-transform infrared spectroscopy technique. The most sophisticated tools like Vibrating sample magnetometer, element-specific soft x-ray absorption spectroscopy and soft-x-ray magnetic circular dichroism (XMCD) were used to probe its electronic and magnetization behaviour. The material exhibits a higher degree of magnetization signifying ferromagnetism in the bulk region as observed at ∼ 300 K and ∼ 670 K. The measured XMCD intensity at 300 K in the bulk-sensitive total-fluorescence-yield mode increased from 0 T to 2 T, which also raises the possibility of long-range ferromagnetic ordering in it. In this perspective of research, MnSi is recognised as a developing material for spintronic-based devices.
A single long NiTi tube compressive elastocaloric regenerator: experimental results
Authors: Cheng Siyuan 
Published: June 2023

Abstract
Elastocaloric cooling is an environmentally friendly alternative to the current vapor-compression refrigeration technology, and the development of an efficient operation strategy is significant for its commercialization. In this article, the cooling performance including the temperature span, specific cooling power, and coefficient of performance for a novel single long NiTi tube compressive elastocaloric regenerator (tube outer diameter 5 mm, wall thickness 1 mm, and initial length 305 mm) was comprehensively characterized under different operation parameters (operation cycle time, loading/unloading time, heat transfer fluid timing, flow time, and utilization). The single long NiTi tube compressive elastocaloric regenerator achieved maximum temperature span, specific cooling power, and coefficient of performance of 5.7 K, 135 W·kg−1, and 4.7, respectively under an applied strain of 2.5%. It was found that the most important factors for obtaining a good cooling performance of the single long NiTi tube compressive elastocaloric regenerator were a short operation cycle time, a proper heat transfer fluid timing, and a proper heat transfer fluid utilization. The dependences of the temperature span on the cycle time and heat transfer fluid utilization factor were in agreement with the existing experimental data for a parallel plate tensile elastocaloric regenerator. A thinner tube wall thickness and advanced cross-section geometry for the regenerator may further improve the cooling performance of the compressive elastocaloric regenerator.
Study on magnetic and thermodynamic characteristics of graphyne-like sandwich structure
Authors: Shi Kai-Le , Wang Chao-Fan , Jiang Wei 
Published: June 2023

Abstract
By employing effective-field theory with correlations, the effects of exchange couplings and anisotropies on the physical properties of graphyne-like sandwich structure with a mixed-spin (5/2, 2) were analyzed. The various characteristic curves of the hysteresis loops, magnetization, susceptibility, internal energy, specific heat, as well as phase diagram was obtained. We found the multiple-loop hysteresis behaviors and reentrant phenomenon under certain conditions. Moreover, we also depicted the variation curves of dynamic magnetization under the impact of a periodically oscillating magnetic field. It is shown that a time-dependent and independent magnetic field can control and induce the disorder and order of the system.
Transitioning from a bounce to R
2 inflation
Authors: Daniel Richard , Campbell Mariam , van de Bruck Carsten , Dunsby Peter 
Published: June 2023

Abstract
Non-singular bouncing cosmologies are well-motivated models for the early universe. Recent observational data are consistent with positive spatial curvature and allow for a natural collapsing and bouncing phase in the very early universe. Additionally, bouncing cosmologies have the potential to rectify conceptual shortcomings identified in the theory of inflation, such as the singularity problem. In this paper we present a classical bouncing model in the context of modified gravity, including an R
2-term in the action. We show that after the bounce, the universe enters naturally a period of inflation, driven by the R
2-term. We analyse the stability of the model and find that the scalaron assists the stability of the model.
Dark energy on astrophysical scales and its detection in the Milky Way
Authors: Zhang Rui , Zhang Zhen 
Published: June 2023

AbstractThe origin and nature of dark energy is one of the most significant challenges in modern science. This research aims to investigate dark energy on astrophysical scales and provide a cosmology-independent method to measure its equation-of-state parameterw. To accomplish this, we introduce the concept of a perfect fluid in any static, curved spacetime, and express the energy-momentum tensor of the perfect fluid in a general isotropic form, namely Weinberg's isotropic form. This enables us to define an equation-of-state parameter in a physical and global manner. Within this theoretical framework, we demonstrate that the energy-momentum tensor of dark energy on different scales can take the general isotropic form. Furthermore, we explore the SdSwspacetime and establish its connection with dark energy in cosmology through the equation-of-state parameterw. In the SdSwspacetime, a repulsive dark force can be induced by dark energy locally. We then apply the concept of the dark force to realistic astrophysical systems using the Poisson equation. Finally, we find that an anomaly in the Milky Way rotation curve can be quantitatively interpreted by the dark force. By fitting the galactic curve, we are able to obtain the value of the equation-of-state parameter of dark energy, independently of specific dark energy models.
A thorough investigation of the prospects of eLISA in addressing the Hubble tension: Fisher forecast, MCMC and Machine Learning
Authors: Shah Rahul , Bhaumik Arko , Mukherjee Purba , Pal Supratik 
Published: June 2023

Abstract
We carry out an in-depth analysis of the capability of the upcoming space-based gravitational wave mission eLISA in addressing the Hubble tension, with a primary focus on observations at intermediate redshifts (3 < z < 8). We consider six different parametrizations representing different classes of cosmological models, which we constrain using the latest datasets of cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and type Ia supernovae (SNIa) observations, in order to find out the up-to-date tensions with direct measurement data. Subsequently, these constraints are used as fiducials to construct mock catalogs for eLISA. We then employ Fisher analysis to forecast the future performance of each model in the context of eLISA. We further implement traditional Markov Chain Monte Carlo (MCMC) to estimate the parameters from the simulated catalogs. Finally, we utilize Gaussian Processes (GP), a machine learning algorithm, for reconstructing the Hubble parameter directly from simulated data. Based on our analysis, we present a thorough comparison of the three methods as forecasting tools. Our Fisher analysis confirms that eLISA would constrain the Hubble constant (H
0) at the sub-percent level. MCMC/GP results predict reduced tensions for models/fiducials which are currently harder to reconcile with direct measurements of H
0, whereas no significant change occurs for models/fiducials at lesser tensions with the latter. This feature warrants further investigation in this direction.
Updating constraints on phantom crossing f(T) gravity
Authors: dos Santos F.B.M. 
Published: June 2023

Abstract
We establish constraints on f(T) gravity by considering the possibility of a scenario
that supports a phantom crossing of the equation of state parameter ω
DE. After
determining the viable parameter space of the model, while checking the impact on the background
dynamics, we perform an analysis to obtain constraints on cosmological parameters and determine
the viability of this scenario. To this end, we use combined data sets from cosmic chronometers
(CC), baryonic acoustic oscillations (BAO), redshift space distortion (RSD) and Type Ia supernovae
(SN) measurements from the latest Pantheon+ set, in which the impact on the absolute magnitude
due to the change of the effective gravitational constant is also considered. It is found that a
state where a phantom crossing of ω
DE happens is favored by data, and the f(T) model
is competitive with the ΛCDM one by statistical criteria, such as AIC and
BIC. Additionally, we find evidence of the Hubble tension being alleviated within the f(T)
model, at the same time that it does not worsen the growth one, indicating a possibility of the
present scenario as an option to address the current cosmic tensions.
A comprehensive review of recent progress on enhancement-mode β-Ga2O3 FETs: Growth, devices and properties
Authors: Li Botong , Zhang Xiaodong , Zhang Li , Ma Yongjian , Tang Wenbo , Chen Tiwei , Hu Yu , Zhou Xin , Bian Chunxu , Zeng Chunhong , Ju Tao , Zeng Zhongming , Zhang Baoshun 
Published: June 2023

Abstract
Power electronic devices are of great importance in modern society. After decades of development, Si power devices have approached their material limits with only incremental improvements and large conversion losses. As the demand for electronic components with high efficiency dramatically increasing, new materials are needed for power device fabrication. Beta-phase gallium oxide, an ultra-wide bandgap semiconductor, has been considered as a promising candidate, and various β-Ga2O3 power devices with high breakdown voltages have been demonstrated. However, the realization of enhancement-mode (E-mode) β-Ga2O3 field-effect transistors (FETs) is still challenging, which is a critical problem for a myriad of power electronic applications. Recently, researchers have made some progress on E-mode β-Ga2O3 FETs via various methods, and several novel structures have been fabricated. This article gives a review of the material growth, devices and properties of these E-mode β-Ga2O3 FETs. The key challenges and future directions in E-mode β-Ga2O3 FETs are also discussed.
Shear Strength Prediction of Reinforced Concrete Two-way Thick Slabs: Comparison between Experimental and Analytical Studies
Authors: Zufarihsan R , Tambusay A , Suprobo P 
Published: June 2023

Abstract
This paper describes an attempt to perform analytical studies on shear strength prediction of reinforced concrete two-way thick slabs. To this end, twenty test data from four groups of researchers were adopted and compared against the shear strength predictions from five shear design equations (i.e., ACI 318-14, ACI 318-19, EC2, CSA, and SMCFT). The ability of these equations to provide accurate prediction was evaluated based on the ratio of test-to-calculated shear strength, coefficient of variation (COV), and distribution of test data against the equality line. From the results presented, it was shown that each shear design prediction varied considerably from one another. Regarding the accuracy, it was shown that the SMCFT design method was able to predict the shear strength more accurately and proved the development of theoretically-sound shear design with a simple and straightforward procedure worked well in this case. It was also shown that improved prediction was able to be captured by ACI 318-19 compared to its preceding version of ACI 318-14. ACI 318-19 was also shown to demonstrate more conservative predictions which were more comparable to SMCFT.
An integrated approach for the strength evaluation on RC beams by the combination of hammer test and compression test
Authors: Hidayat B A , Ahyani A N 
Published: June 2023

Abstract
The structural performance of the old existing RC building needs to be evaluated, as it is susceptible to severe damage. There are two different types to examine the RC members’ capacity: the destructive and non-destructive tests, with their drawbacks and difficulties. The main purpose of this research is to establish the integrated approach to evaluating the compressive strength of RC beams by providing the strength distribution visualization. Hence, the combination of the results from the hammer test, compression test, and the two-point load flexural test was taken into account. In this study, a combination of destructive and non-destructive tests was performed on the RC beam specimen. The hammer test results discovered that the concrete strength was distributed randomly with a difference of 20%. However, the strength pattern in the compression zone showed similar results: a lower strength value. The abovementioned results were then validated with the flexural test. By comparing the concrete failure and the strength distribution visualization, the damaged area has a smaller compressive strength than other areas. Thus, the engineers could use the visualization of the strength distribution as a guide in considering repairing options on RC beams more effectively.
Comparison of flexural beam behavior due to monotonic loading and loading-unloading scheme
Authors: Indriyantho Bobby Rio , Purwanto  , Adhi Muhammad Zulfikar , Pandiangan Ricardo 
Published: June 2023

Abstract
Reinforced concrete is a construction material used frequently in Indonesia to build structural members especially beam structures. As one of the structural members, a beam should be able to carry flexural and shear loading as well as distribute the loading to the column and eventually to the foundation. In order to avoid structural failure in design, the reinforced concrete beam is continuously studied. This research investigates its behavior at monotonic loading and loading-unloading schemes. A point load was applied at the midspan of the simply supported beam. The result showed that the beam subjected to monotonic loading has a slightly overestimated value compared to the beam at loading-unloading condition The first crack load, the yielding load, and the ultimate load at monotonic loading were observed as 6.9%, 6.5%, and 8.2% higher than the result during loading-unloading situations. Crack patterns occurred at both monotonic loading and loading-unloading scheme equally showed that the beam experienced flexural failure. However, the crack at monotonic loading propagated more spread out than the crack happened during the loading-unloading scheme which was more concentrated at the plastic hinge located near the column.
The effects of various parameters in sensitivity analysis of plain concrete beam using rigid body spring model
Authors: Purnomo Joko , Han Aylie , Gan Buntara Sthenly , Hardjito Djwantoro 
Published: June 2023

Abstract
The Rigid Body Spring Model (RBSM) is an alternative method to Finite Element Model (FEM) to solve continuum problems in civil engineering. The method has three main advantages, i.e., having a smaller local stiffness matrix, the ability to directly simulate cracks, and independent formulation of element types. Although the method has been extensively used in studying the behaviour of concrete structures, specific research on sensitivity analysis of this method has not been done nor published. In this research, sensitivity analysis of plain concrete beam using the model is performed. The parameters to be considered are boundary size, boundary element type, number of elements, crack mesh refinement, number of stages, and the effect of half modelling. Based on the sensitivity analysis, optimum parameters were selected to calibrate the model to three plain concrete samples. The result suggests that modulus elasticity of cylindrical concrete under compressive test is to be reduced around 0.2 times for simulating beam under third point loading.
The influence of viscosity-modifying agent and calcium carbonate on 3D printing mortar characteristics
Authors: Antoni A , Adi N , Kurniawan M E , Agraputra A , Teopilus D , Pudjisuryadi P , Chandra J , Hardjito D 
Published: June 2023

Abstract
3D printing or additive manufacturing is an example of technology development in the construction sector. In 3D printing mortar, many things need to be considered regarding the characteristics of the mortar, such as workability, initial setting time, compressive strength, extrudability, and buildability. In previous studies, there were problems in the printing process, such as a lousy extrusion process and cracks in the 3D printing mortar sample. This study used calcium carbonate and a viscosity-modifying agent (VMA) to modify the mixture to achieve the desired characteristics. The extrudability and buildability were tested by observing the extrusion process and measuring the thickness and width of each layer printed. Based on the research, adding calcium carbonate and VMA can reduce workability and accelerate the initial setting time of the mixture. The use of VMA can reduce the compressive strength of the mixture. Using calcium carbonate and VMA can also increase the buildability of the mixture. From the compressive strength test, there was a decrease of 39.26% in the 3D printing mortar sample compared to the mortar cube sample. In addition, it was found that the 3D printing mortar is anisotropic, so the compressive force’s direction affects the compressive strength produced.
High early strength foamed concrete design for structural precast concrete
Authors: Bali Ika , Widjajakusuma Jack , Ng Gino Pranata , Tjahjono Ricky 
Published: June 2023

Abstract
Precast lightweight concrete with specific gravity between 1440 kg/m3 and 1840 kg/m3, and high early compressive strength is one of the alternative materials in responding to the large and fast demand for precast concrete, as well as being easy to transport. This study proposes high early strength foamed concrete as an alternative to precast lightweight concrete for residential construction. The background of this study is considering the limited literature reports related to research on precast foamed concrete for the application of building structural elements. The purpose of this study was to obtain high early strength foamed concrete for structural precast concrete with minimum characteristics, including initial compressive strength of 14 MPa at 3 days of age, 20 MPa of compressive strength at 28 days of age, and specific gravity of less than 1750 kg/m3. There are 3 types of foamed concrete was studied, namely normal foamed concrete, foamed concrete with LDPE, and foamed concrete with water substitution accelerator. Then, compressive strength testing was conducted on cylindrical specimens. The results showed that foamed concrete with 10% water substitution accelerator produced the highest values for the initial compressive strength of 3 days and 28 days of age, 21.64 MPa and 29.27 MPa, respectively, and the specific gravity of 1743 kg/m3.
Properties evaluation of cold mix asphalt based on compaction energy and mixture gradation
Authors: Wulandari P S , Tjandra D 
Published: June 2023

Abstract
Mix design for cold mix asphalt as a surface course has several factors to be considered, such as the traffic level and environmental condition. The compaction energy in mix design is related to expected traffic level. The choice of aggregate gradation is affected by the environment condition. Generally, there are two types of cold asphalt mixture, open graded and dense graded. The purpose of this study is to investigate the properties of cold mix asphalt surface course considering the compaction energy and aggregate gradation factors by laboratory experiments. The trial specimens were prepared with five different cationic emulsion bitumen contents for each type of mixture gradation at various compaction energy using Marshall compactor machine. The stability and volumetric properties of these specimens were measured by Marshall Test and then compared to the specified values. If the pavement is designed properly, dense graded cold mix asphalt could be used for surface course for medium and light traffic, while open graded mixture has potential application for heavy traffic. Over compaction could cause a greatly increased stiffness of mixture, which potentially lead to crack. Cold mix asphalt with different type of gradation needs different compaction energy to reach the best properties of mixture.
The effect of asphalt emulsion type on the characteristics of cold asphalt emulsion mixtures
Authors: Wulandari P S , Lovrecia K , Santosa F M , Welerubun G A 
Published: June 2023

Abstract
The need for road infrastructure continues to increase affecting the increase of hot asphalt mixtures. Hot asphalt requires a lot of energy to use because it goes through a heating process, so Cold Emulsion Asphalt Mixture (CAEM) is widely studied to be an eco-friendly alternative to hot asphalt mixtures. This study used a type of mixture IV Asphalt Emulsion Mixture with 4 types of emulsified asphalt, which are Cationic Slow Setting-1 hard (CSS-1h), Cationic Medium Setting-2 (CMS-2), Cationic Rapid Setting-2 (CRS- 2), and Cationic Quick Setting-1 hard (CQS-1h). The test was carried out using the Marshall Test method and the parameters value of each type of emulsified asphalt was calculated. The test results are compared with their characteristics to determine the most suitable type of emulsified asphalt for heavy traffic in Indonesia. The results showed that CRS-2 emulsified asphalt was not recommended because it had low stability and did not meet the parameter requirements. The use of CQS-1h is recommended because at an early age it can produce high stability value and meet all requirements.
Comparison of Asphalt Concrete-Wearing Course (AC-WC) characteristics using 60/70 asphalt penetration and Elvaloy modified asphalt
Authors: Lubis Adina Sari , Muis Zulkarnain Abdul , Irza Muhammad Hafiz 
Published: June 2023

Abstract
The performance of the asphalt mixture is affected by the asphalt characteristics and the gradation of the aggregate. Polymer-modified asphalt has been widely used to overcome road pavement damage such as cracking, spalling, yielding, and damage due to deformation due to grooves, curling, or rutting. Polymer-modified asphalt has been widely used, both from plastomers and elastomeric types. Elvaloy modification asphalt resulted from the conventional asphalt mixing process of 60/70 with Elvaloy additives from Dupont that are elastomer using RET (Reactive Elastomer Terpolymer) technology. This study aimed to compare the characteristics of the AC-WC mixture using 60/70 penetration asphalt and Elvaloy modified asphalt. The study began by making a paved mixture using 60/70 penetration asphalt with the middle-graded aggregate. The Elvaloy modified asphalt has three aggregate gradations: lower limit, middle, and upper limit gradation. Test objects were made as many as 156 test objects to obtain Optimum Asphalt Content (OAC) values, then using OAC values, made 36 test objects for the Marshall test; 4 test objects for Wheel Tracking Machine (WTM) testing. The Marshall and WTM tests determine the performance of 60/70 penetration asphalt and Elvaloy modified asphalt on the AC-WC mixture. The research results of the properties test showed that Elvaloy modified asphalt has a better penetration value, softening point and ductility than 60/70 penetration asphalt. Marshall’s test results provided the highest Stability and flow value in the Elvaloy modified asphalt mixture. From the results of the WTM test, only the middle grade of Elvaloy modified asphalt meets the specification.