检索结果-内蒙古大学图书馆

multi-kernel and multi-scale learning based deep ensemble model for predicting recurrence of non-small cell lung cancer

引用

PeerJ Computer science 2023年 9卷

作者： Kim, Gihyeon Park, Young Mi Yoon, Hyun Jung Choi, Jang-Hwan Department of Computational Medicine Graduate Program in System Health Science and Engineering Ewha Womans University Seoul Korea Republic of Department of Molecular Medicine College of Medicine Ewha Womans University Seoul Korea Republic of Department of Radiology Veterans Health Service Medical Center Seoul Korea Republic of Division of Mechanical and Biomedical Engineering Graduate Program in System Health Science and Engineering Ewha Womans University Seoul Korea Republic of Department of Artificial Intelligence Ewha Womans University Seoul Korea Republic of

Predicting recurrence in patients with non-small cell lung cancer (NSCLC) before treatment is vital for guiding personalized medicine. Deep learning techniques have revolutionized the application of cancer informatics, including lung cancer timeto-event prediction. Most existing convolutional neural network (CNN) models are based on a single two-dimensional (2D) computational tomography (CT) image or three-dimensional (3D) CT volume. However, studies have shown that using multiscale input and fusing multiple networks provide promising performance. This study proposes a deep learning-based ensemble network for recurrence prediction using a dataset of 530 patients with NSCLC. This network assembles 2DCNNmodels of various input slices, scales, and convolutional kernels, using a deep learning-based feature fusion model as an ensemble strategy. The proposed framework is uniquely designed to benefit from (i) multiple 2D in-plane slices to provide more information than a single central slice, (ii) multi-scale networks and multi-kernel networks to capture the local and peritumoral features, (iii) ensemble design to integrate features from various inputs and model architectures for final prediction. The ensemble of five 2D-CNN models, three slices, and two multi-kernel networks, using 5×5 and 6×6 convolutional kernels, achieved the best performance with an accuracy of 69.62%, area under the curve (AUC) of 72.5%, F1 score of 70.12%, and recall of 70.81%. Furthermore, the proposed method achieved competitive results compared with the 2D and 3D-CNN models for cancer outcome prediction in the benchmark studies. Our model is also a potential adjuvant treatment tool for identifying NSCLC patients with a high risk of recurrence. © 2023 Kim et al.

关键词： Neural network models

来源：评论

学校读者我要写书评

暂无评论

Effect of powder bed fusion process parameters on microstructural and mechanical properties of FeCrNi MEA: An atomistic study

arXiv

引用

arXiv 2022年

作者： Jamil, Ishat Raihan Mustaquim, Ali Muhit Islam, Mahmudul Thakur, Md Shajedul Hoque Hasan, Mohammad Nasim Department Of Mechanical Engineering Bangladesh University Of Engineering And Technology Dhaka1000 Bangladesh Department Of Materials Science And NanoEngineering Rice University HoustonTX77005 United States

In our study, molecular dynamics (MD) simulations of laser powder bed fusion (LPBF) have been conducted on equimolar FeNiCr medium entropy alloy (MEA) powders. With the development of newer LPBF technologies capable of printing at the microscale, an even deeper understanding of the underlying atomistic effects of the process parameters on the microstructural and mechanical properties of the manufactured FeNiCr MEA products is required. In accordance with previous literature, the parameters of the LPBF process have been systematically varied, including layer resolution from 1 to 6, laser power from 100 μW to 220 μW, bed temperature from 300 K to 1200 K, and laser scan speed from 0.5 Å/ps to 0.0625 Å/ps. Consistent with prior macroscopic experimental findings, the atomistic results suggest that additive manufacturing using thinner layers imparts higher ultimate tensile strength (UTS) than fabricating with thicker layers. The latter, however, requires a shorter process time but induces keyhole defect formation if the laser-induced temperature is not sufficiently high enough. Increasing the temperature proves useful in mitigating this problem. Enhancement of UTS for the multi-rowed powders has been observed by raising the substrate temperature to 600 K or laser power to 160 μW during production. Beyond these critical limits, however, the UTS of the product diminishes due to the emergence of multiple vacancies. The results of our present study will help researchers to find a good balance between the production speed and strength of additive manufactured products at the nanoscale. © 2022, CC BY.

关键词： Chromium alloys

来源：评论

学校读者我要写书评

暂无评论

Optimizing Lpbf-Parameters by Box-Behnken Design Allows to Print Crack-Free and Dense High-Boron Alloyed Stainless Steels

SSRN

引用

SSRN 2024年

作者： Freitas, Brenda Juliet Martins Koga, Guilherme Yuuki Arneitz, Siegfried Bolfarini, Claudemiro de Traglia Amancio-Filho, Sergio Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos13.565-905 Brazil Graz University of Technology Institute of Materials Science Joining and Forming Graz8010 Austria Federal University of São Carlos Department of Materials Engineering São Carlos13.565-905 Brazil Rod. Washington Luis São Carlos13565-905 Brazil

Boron has almost null solubility in iron, and its addition to stainless steels leads to the formation of hard borides, beneficial for increasing the wear resistance. However, these boron-containing steels have poor printability, with the occurrence of pronounced cracking, high porosity and risk of delamination. In this work Box-Behnken design coupled to analysis of variance (ANOVA) were used to optimize the LPBF (Laser Powder Bed Fusion) processing parameters of a highly boron-alloyed stainless steel reinforced with a boride network. The proposed models demonstrated to be accurate to determine the porosity percentage for the studied alloys, in which the laser power and scanning speed play the main role on the alloys’ densification, and absence of extensive defects. These results indicate that the use of design of experiments tools are essential to produce defect-free boron-modified stainless steel specimens with a relatively low number of experiments, identifying a narrow optimized processing window to build bulk composite materials. © 2024, The Authors. All rights reserved.

关键词： Design of experiments

来源：评论

学校读者我要写书评

暂无评论

Study on the Microstructure and mechanical Properties of Additively Manufactured Fecocrmnni High Entropy Alloy Composite after Aging

SSRN

引用

SSRN 2023年

作者： Ma, Pan Yang, Hong Zhang, Zhiyu Fang, Yacheng Wan, Shiguang Xie, Kaiqiang Konda Gokuldoss, Prashanth Jia, Yandong School of Materials Science and Engineering Shanghai University of Engineering Science Shanghai China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin150001 China Department of Mechanical and Industrial Engineering Tallinn University of Technology Ehitajate tee 5 Tallinn19086 Estonia CBCMT School of Mechanical Engineering Vellore Institute of Technology Tamil Nadu Vellore630014 India Laboratory for Microstructures Institute of Materials Shanghai University Shanghai200444 China

High-entropy alloy composites (HEAC) have attracted significant attention due to their exceptional mechanical properties and chemical stability. By adjusting the content of reinforcing particles in the high-entropy alloy (HEA) and by employing advanced additive manufacturing (AM) techniques, high-performance HEACs can be fabricated. However, there is still considerable room for improvement in their performance. In this study, CoCrFeMnNi HEA powders were used as the matrix, and NiCoFeAlTi high-entropy intermetallic powders (HER) were used as the reinforcement. CoCrFeMnNi HEA/NiCoFeAlTi HER HEAC were fabricated using selective laser melting technology (SLM). The effects of aging treatment were investigated, and the strengthening mechanism was elucidated. The results show that with increasing aging temperature, the elements promoting solid solution tend to homogenize, leading to an increase in the lattice constant of the HEA matrix. The microstructure exhibited grain growth, precipitation of Al and Ti-rich phases, precipitation phase coarsening, and the emergence of annealing twins. After aging at 873 K for 2 h, the HEAC exhibits the highest hardness and ultimate tensile strength. This work provides a foundation for exploring the post-processing of HEAC with HER. © 2023, The Authors. All rights reserved.

关键词： Entropy

来源：评论

学校读者我要写书评

暂无评论

Risk-Based Approach for Improving Concrete Bridges' Inspection Planning 15

Risk-Based Approach for Improving Concrete Bridges' Inspecti...

引用

15th International Conference on Durability of Building materials and Components, DBMC 2020

作者： Tronsli, Sindre Samarakoon, Samindi M.K. Ratnayake, R.M. Chandima Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Norway

ISBN: (纸本)9788412110180

Visual inspection forms the basis of the inspection planning process for concrete bridges. The authority responsible for bridge inspection maintains a database to record past inspection results, in order to plan future inspections. It is a challenge to recognize and classify bridges that it is essential to inspect based on inherent requirements. This is further exacerbated by the limited budget available. This manuscript describes a methodology for classifying bridges based on risk of potential failure and distributing the annual inspection budget for carrying out inspections on bridges accordingly. The absence of such a methodology allocation of resources for bridge inspection without real need. For example, on some occasions it is not necessary to inspect certain bridges on a time basis. Hence, this study focuses on developing an inspection-planning approach based on the actual and predicted condition (i.e. based on the database of past inspection data). It enables the bridges to be classified into different categories, based on the risk of potential failures. This enables the effective distribution of annual budgets among the bridges, avoiding unnecessary inspection that incurs pointless inspection costs. © The authors.

关键词： Inspection

来源：评论

学校读者我要写书评

暂无评论

A comparison study on the characterization of bubbles formed in a ladle and a continuous casting mold during gas injection using advanced imaging techniques

A comparison study on the characterization of bubbles formed...

引用

AISTech 2021 Iron and Steel Technology Conference

作者： Srivastava, Amiy Dinda, Soumitra Kumar Chattopadhyay, Kinnor Sengupta, Joydeep Department of Materials Science and Engineering Process Metallurgy Research Laboratory University of Toronto Canada Cross Appointed to Mechanical and Industrial Engineering University of Toronto Canada Global R &D Hamilton ArcelorMittal Dofasco Canada

ISBN: (纸本)9781935117933

Gas injection in steelmaking vessels has multi-fold benefits. Bubbles inside these vessels influence steel processing and quality. Bubble visualization and characterization are required to generate fundamental knowledge related to steel-gas interactions. To estimate and compare bubble size distributions (BSD), physical modeling was performed at the University of Toronto in a 1:8-scale caster mold and 1:30-scale ladle using advanced imaging techniques with a speed-sense camera. Effect of physical properties, such as surface tension and viscosity on BSD, was examined using dimensional analysis by utilizing different simulating liquids. Single-scale characterization was employed to achieve BSD correlations with operating variables and liquid properties. © 2021 by the Association for Iron & Steel Technology.

关键词： Ladles

来源：评论

学校读者我要写书评

暂无评论

Ultrafine-Grained Stainless Steel with Wear-Resistant Nanoborides Decorating Grain Boundaries Produced by Laser Powder Bed Fusion

SSRN

引用

SSRN 2024年

作者： Martins Freitas, Brenda Juliet Koga, Guilherme Yuuki Miguel Rodrigues, Luana Cristina Botta Filho, Walter José Amancio-Filho, Sergio de Traglia Bolfarini, Claudemiro Federal University of São Carlos Graduate Program in Materials Science and Engineering São Carlos13.565-905 Brazil Graz University of Technology Institute of Materials Science Joining and Forming Graz8010 Austria Federal University of São Carlos Department of Materials Engineering São Carlos13.565-905 Brazil Rod. Washington Luis São Carlos13565-905 Brazil

Stainless steel composites combine corrosion resistance and toughness of the metallic matrix with wear resistance granted by hard reinforcing nanoparticles. Given their near-net-shape manufacturing characteristics, additive manufacturing techniques are attractive to produce these hard and wear-resistant classes of materials with low machinability. In this work, from a SAF 2205 duplex stainless steel with boron addition, laser powder bed fusion (LBPF) was employed to produce an ultrafine-grained (~1 µm), dense (porosity ~0.1%), and crack-free ferritic-induced matrix composite with Cr2B-nanoborides reinforcing the grain boundaries (GBs) without formation of Cr-depleted regions. The composite showed significant higher hardness (up to 456 HV0.5) and wear resistance (4.4 x 10-5 mm3 N-1m-1) in sliding condition compared to a hot-rolled (225 HV0.5 and 2.9 x 10-3 mm3 N-1m-1) and a LPBF-produced SAF 2205 (314 HV0.5 and 3.3 x 10-4 mm3 N-1m-1). © 2024, The Authors. All rights reserved.

关键词： Wear of materials

来源：评论

学校读者我要写书评

暂无评论

Comparison of Dislocation Loop Formation Resistance in Nanocrystalline and Coarse-Grained Refractory High Entropy Alloys

引用

High Entropy Alloys & materials 2023年第2期1卷 260-265页

作者： El-Atwani, Osman Vo, Hi Krienke, Nick Martinez, Enrique Baldwin, Jon Kevin Chen, Wei-Ying Li, Meimei Fensin, Saryu Materials Science and Technology Division Los Alamos National Laboratory Los Alamos USA Department of Mechanical Engineering Clemson University Clemson USA Division of Nuclear Engineering Argonne National Laboratory Argonne USA Center for Integrated Nanotechnology Los Alamos National Laboratory Los Alamos USA

In nanocrystalline high entropy alloys (HEAs), the difference in chemistry and the density of interfaces play a role in the microstructure evolution, although their relative importance is not well understood. Here, we compare data published in the literature regarding dislocation loop damage in pure W under ion irradiation to new results on nanocrystalline and coarse grained HEAs irradiated under single and dual ion beams. Dislocation loop damage evolution has been studied. The results suggest that both grain boundaries and grain matrices play important roles in the microstructure evolution of HEAs with grain matrices playing the dominant role. Irradiation response and dislocation loop damage in coarse-grained (a) and nanocrystallinegrained (b) W-based HEAs as compared to coarse-grained (c) and nanocrystalline-grained (d) pure W material.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An Atomistic-To-Microscale Characterization of the Kink-Controlled Dislocation Dynamics in BCC Metals Through Finite-Temperature Coarse-Grained Atomistic Simulations

SSRN

引用

SSRN 2023年

作者： Ji, Rigelesaiyin Phan, Thanh Chen, Youping McDowell, David Xiong, Liming Department of Aerospace Engineering Iowa State University AmesIA50011 United States Department of Mechanical and Aerospace Engineering NC State University RaleighNC27695 United States Department of Mechanical and Aerospace Engineering University of Florida GainesvilleFL32611 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States G.W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States

Adopting bcc tungsten (W) as a model material, we characterize the temperature and stress dependence of kink dynamics on a dislocation line with length L ranging from 60 nm to 1 μm using finite-temperature coarse-grained (FT-CG) atomistic simulations. The main novelty of this work is to accommodate major salient aspects, namely the motion of am-long dislocation lines, the atomic-scale kink dynamics, and the full spectrum of phonon dynamics, all in one single FT-CG model. Several findings arise from our FT-CG simulations: the flow stress, σf, not only depends on the temperature, T, but also exhibits a clear dependence on L. The σf for the motion of μm-long dislocations approaches experimental results but σf for nm-long dislocations does not;with increase of T, the σf reduction associated with the motion of μm-long dislocations is significantly larger than that for nm-long dislocations;the kink activation enthalpy, ΔH, exhibits a dependence on L. It can be as high as ~3 eV for a dislocation with a length of tens of nm but reduces to ~1.5 eV when L is 0.3 μm or longer;The slope of the ΔH – T relation is largely underestimated in nanoscale atomistic simulations, and can be only comparable with that from experiments when L is ~ 0.3 μm or longer. These findings highlight the shortcomings of nanoscale atomistic models in simulating kink-controlled dislocation dynamics. The gained knowledge can support the development of new mobility laws for understanding plasticity in bcc and other high-Peierls-stress alloys. © 2023, The Authors. All rights reserved.

关键词： Coarse-grained modeling

来源：评论

学校读者我要写书评

暂无评论

Role of Graphene Oxide in Bacterial Cellulose−Gelatin Hydrogels for Wound Dressing Applications

引用

ACS Omega 2023年第18期8卷 15909-15919页

作者： Khan, Muhammad Umar Aslam Stojanović, Goran M. Hassan, Rozita Anand, T. Joseph Sahaya Al-Ejji, Maryam Hasan, Anwarul Biomedical Research Center Qatar University Doha 2713 Qatar Department of Mechanical and Industrial Engineering Qatar University Doha 2713 Qatar Faculty of Technical Sciences University of Novi Sad T. Dositeja Obradovi’ca 6 Novi Sad 21000 Serbia Orthodontic Unit School of Dental Science Universiti Sains Malaysia Kelantan Kubang Kerian 16150 Malaysia Sustainable and Responsive Manufacturing Group Faculty of Mechanical and Manufacturing Engineering Technology Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Malacca Melaka 76100 Malaysia Center for Advanced Materials Qatar University Doha 2713 Qatar

Biopolymer-based hydrogels have several advantages, including robust mechanical tunability, high biocompatibility, and excellent optical properties. These hydrogels can be ideal wound dressing materials and advantageous to repair and regenerate skin wounds. In this work, we prepared composite hydrogels by blending gelatin and graphene oxide-functionalized bacterial cellulose (GO-f-BC) with tetraethyl orthosilicate (TEOS). The hydrogels were characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscope (AFM), and water contact angle analyses to explore functional groups and their interactions, surface morphology, and wetting behavior, respectively. The swelling, biodegradation, and water retention were tested to respond to the biofluid. Maximum swelling was exhibited by GBG-1 (0.01 mg GO amount) in all media (aqueous = 1902.83%, PBS = 1546.63%, and electrolyte = 1367.32%). All hydrogels were hemocompatible, as their hemolysis was less than 0.5%, and blood coagulation time decreased as the hydrogel concentration and GO amount increased under in vitro standard conditions. These hydrogels exhibited unusual antimicrobial activities against Gram-positive and Gram-negative bacterial strains. The cell viability and proliferation were increased with an increased GO amount, and maximum values were found for GBG-4 (0.04 mg GO amount) against fibroblast (3T3) cell lines. The mature and well-adhered cell morphology of 3T3 cells was found for all hydrogel samples. Based on all findings, these hydrogels would be a potential wound dressing skin material for wound healing applications. © 2023 The Authors. Published by American Chemical Society.

关键词： Absorption Anatomy Biomaterials Hydrogels Hydrophilicity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：