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Results in Materials 2021年 10卷

作者： Bhatta, Gyanendra De Los Santos Valladares, Luis Liu, Xinggang Ma, Zhaojun Bustamante Domínguez, A.G. Moreno, N.O. Espinoza Suarez, S.M. Barnes, C.H.W. Zhang, Deliang School of Materials Science and Engineering Northeastern University Liaoning Shenyang 110819 China Key Laboratory of Data Analytics and Optimization for Smart Industry (Ministry of Education) Northeastern University Shenyang 110819 China Laboratorio de Ceramicos y Nanomaterailes Facultad de Ciencias Físicas Universidad Nacional Mayor de San Marcos Ap. Postal 14-0149 Lima Peru Cavendish Laboratory Department of Physics University of Cambridge UK Cambridge CB3 0HE United Kingdom Departamento de Física Universidade Federal de Sergipe SE São Cristóvão 49100- 000 Brazil

4Cr5MoSiV (H11) steel machining chips were crushed to a powder and then consolidated into discs by hot pressing under various consolidation parameters. The discs were subjected to modified spheroidizing annealing treatment, and their evolved microstructure, tensile mechanical properties and fracture behavior were studied. The microstructure consisted of α−Fe as a matrix, together with heterogeneously distributed non metallic inclusions from the chip-crushing step and precipitated secondary phases. The yield strength, fracture strength and elongation to fracture of the consolidated discs were determined to be in the range of 215∼264 MPa, 344∼415 MPa and 1.2∼2.6%, respectively. The strength of the recycled H11 steel was comparable with that of the ingot metallurgy (IM) H11 steel, but the tensile ductility of the former was significantly lower than that of the latter, being mainly caused by the fracture of the non-metallic inclusions along with the hard secondary phase particles in the IM H11 steel which leads to premature fracture of the samples. The Vickers hardness of the samples were in the range of 144∼194 HV being comparable to that of the IM counterpart. Factographs of the fracture surface demonstrated that the tensile test specimens fractured in a brittle fracture mode. © 2021 The Author(s)

关键词： Brittle fracture H11 Steel Microstructure Modified spheroidizing Solid state recycling Tensile properties

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A preliminary forecast for cosmological parameter estimation with gravitational-wave standard sirens from TianQin

arXiv

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arXiv 2019年

作者： Wang, Ling-Feng Zhao, Ze-Wei Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

TianQin is a space-based gravitational-wave observatory scheduled to be launched in the 2030s. In this work, we make a preliminary forecast for the cosmological parameter estimation with the gravitational-wave standard siren observation from TianQin. We simulate the standard siren data of TianQin from its five-year observation after its completion of construction. In the simulation, three models of growth history of massive black holes, i.e., pop III, Q3nod, and Q3d, are considered in the prediction for the event numbers of massive black hole binary mergers. We find that: (i) among the three black hole growth models, the TianQin's data simulated based on the Q3nod model can provide the tightest constraints on the cosmological parameters;(ii) although the cost of TianQin is less than that of LISA, their capabilities on constraining cosmological parameters using the standard siren observation are actually similar;and (iii) the standard siren observation from TianQin can actually provide important helps in the cosmological estimation in the future. Copyright © 2019, The Authors. All rights reserved.

关键词： Parameter estimation

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A new cosmological probe from supermassive black hole shadows

arXiv

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arXiv 2019年

作者： Qi, Jing-Zhao Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

In this letter, we study the prospect for using the low-redshift and high-redshift black hole shadows as a new cosmological standard ruler to measure the cosmological parameters. We show that, using the low-redshift observation of the black hole shadow of M87?, the Hubble constant can be independently measured at the precision of about 11%, with the measurement result H0 = 70±8 km s−1 Mpc−1, well consistent with the measurement result from the gravitational-wave standard siren observation, but with smaller error. If we assume that in the current stage for single data points the errors are all similar, a naive estimation shows that only about 30 data of the the low-redshift observation of black hole shadows can be used to improve the measurement of H0 to be at the precision of about 2%. The high-redshift observations of supermassive black hole shadows might accurately measure a parameter combination of H0 and Ωm, and we show by a simple simulation that the combination of the black hole shadows with the type Ia supernovae observation would give precise measurements for cosmological parameters. Copyright © 2019, The Authors. All rights reserved.

关键词： Cosmology

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Quantifying the impacts of future gravitational-wave data on constraining interacting dark energy

arXiv

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arXiv 2019年

作者： Li, Hai-Li He, Dong-Ze Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

In this work, we investigate the impacts of the gravitational-wave (GW) standard siren observation of the Einstein Telescope (ET) on constraining the interacting dark energy models. We simulate 1000 GW events data in the redshift range 0. z. 5 based on the 10 years observation of the ET. We combine the simulated GW data with the current mainstream cosmological electromagnetic observations including the cosmic microwave background (CMB) anisotroties observation, the baryon acoustic oscillations (BAO), and the type Ia supernovae (SN) observation (Pantheon compilation) to constrain these models. We consider two typical interacting dark energy (IDE) models, i.e., the IΛCDM model and IwCDM model, in the context of a perturbed universe. To avoid the large-scale instability problem for IDE models, we apply the parameterized post-Friedmann (PPF) approach to do the analysis. We find that the addition of GW standard siren data could improve the constraint accuracies on most of the cosmological parameters (e.g., H0, w, and Ωm) significantly. For the coupling constant β, the absolute constraint errors could also be slightly improved when adding the GW data in the cosmological fit. Copyright © 2019, The Authors. All rights reserved.

关键词： Cosmology

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Prospect for constraining holographic dark energy with gravitational wave standard sirens from the Einstein Telescope

arXiv

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arXiv 2019年

作者： Zhang, Jing-Fei Dong, Hong-Yan Qi, Jing-Zhao Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

We study the holographic dark energy (HDE) model by using the future gravitational wave (GW) standard siren data observed from the Einstein Telescope (ET) in this work. We simulate 1000 GW standard siren data based on a 10-year observation of the ET to make this analysis. We find that all the cosmological parameters in the HDE model can be tremendously improved by including the GW standard siren data in the cosmological fit. The GW data combined with the current cosmic microwave background anisotropies, baryon acoustic oscillations, and type Ia supernovae data will measure the cosmological parameters Ωm, H0, and c in the HDE model to be at the accuracies of 1.28%, 0.59%, and 3.69%, respectively. A comparison with the cosmological constant model and the constant-w dark energy model shows that, compared to the standard model, the parameter degeneracies will be broken more thoroughly in a dynamical dark energy model. We find that the GW data alone can provide a fairly good measurement for H0, but for other cosmological parameters the GW data alone can only provide rather weak measurements. However, due to the fact that the parameter degeneracies can be broken by the GW data, the standard sirens can play an essential role in improving the parameter estimation. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravity waves

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Cosmological parameter estimation with future gravitational wave standard siren observation from the Einstein Telescope

arXiv

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arXiv 2019年

作者： Zhang, Jing-Fei Zhang, Ming Jin, Shang-Jie Qi, Jing-Zhao Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

In this work, we use the simulated gravitational wave (GW) standard siren data from the future observation of the Einstein Telescope (ET) to constrain various dark energy cosmological models, including the ΛCDM, wCDM, CPL, αDE, GCG, and NGCG models. We also use the current mainstream cosmological electromagnetic observations, i.e., the cosmic microwave background anisotropies data, the baryon acoustic oscillations data, and the type Ia supernovae data, to constrain these models. We find that the GW standard siren data could tremendously improve the constraints on the cosmological parameters for all these dark energy models. For all the cases, the GW standard siren data can be used to break the parameter degeneracies generated by the current cosmological electromagnetic observational data. Therefore, it is expected that the future GW standard siren observation from the ET would play a crucial role in the cosmological parameter estimation in the future. The conclusion of this work is quite solid because it is based on the analysis for various dark energy models. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravity waves

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Dynamic radiomics: A new methodology to extract quantitative time-related features from tomographic images

arXiv

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arXiv 2020年

作者： Che, Fengying Shi, Ruichuan Li, Shuqin Wu, Jian Li, Haoran Chen, Weixing Zhang, Hao Qu, Hui Li, Zhi Cui, Xiaoyu College of Medicine and Biological Information Engineering Northeastern University Liaoning Shenyang China Key Laboratory of Intelligent Computing in Medical Image Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Liaoning Shenyang China Department of Medical Oncology The First Affiliated Hospital of China Medical University Liaoning110001 China Shenzhen College of Advanced Technology University of the Chinese Academy of Sciences Beijing100049 China Department of Breast Surgery Liaoning Cancer Hospital and Institute Cancer Hospital of China Medical University Liaoning Shenyang110042 China

The feature extraction methods of radiomics are mainly based on static tomographic images at a certain moment, while the occurrence and development of disease is a dynamic process that cannot be fully reflected by only static characteristics. This study proposes a new dynamic radiomics feature extraction workflow that uses time-dependent tomographic images of the same patient, focuses on the changes in image features over time, and then quantifies them as new dynamic features for diagnostic or prognostic evaluation. We first define the mathematical paradigm of dynamic radiomics and introduce three specific methods that can describe the transformation process of features over time. Three different clinical problems are used to validate the performance of the proposed dynamic feature with conventional 2D and 3D static *** results show that compared with static features, dynamic feature extraction can achieve higher robustness and accuracy for time-dependent tomographic images. We also found that the dynamic features that influence different clinical problems are also quite different. Copyright © 2020, The Authors. All rights reserved.

关键词： Tomography

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Real-time cosmology with SKA

arXiv

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arXiv 2019年

作者： Liu, Yan Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

In this work, we investigate what role the redshift drift data of Square Kilometre Array (SKA) will play in the cosmological parameter estimation in the future. To test the constraint power of the redshift drift data of SKA-only, the ΛCDM model is chosen as a reference model. We find that using the SKA1 mock data, the ΛCDM model can be loosely constrained, while the model can be well constrained when the SKA2 mock data are used. When the mock data of SKA are combined with the data of the European Extremely Large Telescope (E-ELT), the constraints can be significantly improved almost as good as the data combination of the type Ia supernovae observation (SN), the cosmic microwave background observation (CMB), and the baryon acoustic oscillations observation (BAO). Furthermore, we explore the impact of the redshift drift data of SKA on the basis of SN+CMB+BAO+E-ELT in the ΛCDM model, the wCDM model, the CPL model, and the HDE model. We find that the redshift drift measurement of SKA could help to significantly improve the constraints on dark energy and could break the degeneracy existing between the cosmological parameters. Therefore, we conclude that redshift-drift observation of SKA would provide a good improvement in the cosmological parameter estimation in the future and have the enormous potential to be one of the most competitive cosmological probes in constraining dark energy. Copyright © 2019, The Authors. All rights reserved.

关键词： Cosmology

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Gravitational wave standard sirens and cosmological parameter measurement

arXiv

引用

arXiv 2019年

作者： Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

Gravitational wave standard sirens can be used to arbitrate the H0 tension within the following several years. In the future, the observation of gravitational wave standard sirens would be developed into a powerful new cosmological probe because they can play an important role in breaking parameter degeneracies formed by other observations. Therefore, gravitational wave standard sirens are of great importance for the future accurate measurement of cosmological parameters. Copyright © 2019, The Authors. All rights reserved.

关键词： Gravity waves

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Model-independent constraints on cosmic curvature from strong gravitational lensing and type Ia supernova observations

arXiv

引用

arXiv 2019年

作者： Wang, Bo Qi, Jing-Zhao Zhang, Jing-Fei Zhang, Xin Department of Physics College of Sciences Northeastern University Shenyang110819 China Ministry of Education's Key Laboratory of Data Analytics and Optimization for Smart Industry Northeastern University Shenyang110819 China Center for High Energy Physics Peking University Beijing100080 China

Applying the distance sum rule in strong gravitational lensing (SGL) and type Ia supernova (SN Ia) observations, one can provide an interesting cosmological model-independent method to determine the cosmic curvature parameter Ωk. In this paper, with the newly compiled data sets including 161 galactic-scale SGL systems and 1048 SN Ia data, we place constraints on Ωk within the framework of three types of lens models extensively used in SGL studies. Moreover, to investigate the effect of different mass lens samples on the results, we divide the SGL sample into three subsamples based on the center velocity dispersion of intervening galaxies. In the singular isothermal sphere (SIS) and extended power-law lens models, a flat universe is supported with about 20% uncertainty, while a closed universe is preferred in the power-law lens model. We find that the choice of lens models and the classification of SGL data actually can influence the constraints on Ωk significantly. Copyright © 2019, The Authors. All rights reserved.

关键词： Supernovae

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