检索结果-内蒙古大学图书馆

Prediction of Undisturbed Clay Rebound Index Based on Soil microstructure parameters and PSO-SVM Model

KSCE JOURNAL OF CIVIL ENGINEERING 2022年第5期26卷 2097-2111页

作者： Dong, Jiaqi Wang, Boxin Yan, Xuexin Xu, Xinchuan Xiao, Guangping Yu, Qingbo Yao, Meng Wang, Qing Jilin Univ Coll Construct Engn Changchun 130026 Peoples R China Minist Nat Resources Key Lab Land Subsidence Monitoring & Prevent Shanghai 200072 Peoples R China Shanghai Inst Geol Survey Shanghai 200072 Peoples R China China Water Northeastern Invest Design & Res Co L Changchun 130000 Peoples R China CCCC Fourth Nav Engn Survey & Design Inst Co Ltd Guangzhou 510220 Peoples R China

The rebound index C-r is an important design parameter in engineering construction, and its determination is cumbersome and susceptible to errors. Explaining the macroscopic rebound characteristic parameter C-r from the perspective of microscopic mechanism is an important research area that is addressed in this study. In this paper, the different soil parameters, including the C-r parameter and the physical parameters (void ratio e(r) liquid limit water content W-L, and plasticity index I-p), have been determined through experiments for the undisturbed clay of Chongming East Shoal (CES), Shanghai. Further, scanning electron microscopy (SEM) imaging was used to analyze the microstructural features. Through SEM, the grey correlation degree, the average abundance of structural units AC(p) and the average equivalent diameter of pores AD(v) were determined as the soil microstructure parameters with the most significant correlation with C-r. The predictive analysis model of C-r was then carried out combined with the PSO-SVM algorithm. In order to evaluate the influence of microscopic parameters of soil on the prediction accuracy, four sets of input parameter combinations were used. The results indicate the high prediction accuracy of the developed model. Sensitivity analysis was also carried out, which showed that the sensitivity of C-r to AC(p) and AD(v) was significantly lower than e;however, the difference from w(L) and I-p was small, indicating that it is imperative to consider microscopic parameters while predicting C-r. This study, thus, provides a basis and method for predicting the rebound index of soil from the microstructure perspective.

关键词： Rebound index microstructure parameters PSO-SVM Sensitivity analysis Microscopic mechanism

来源：评论

学校读者我要写书评

暂无评论

Correlation between microstructure parameters and anti-cancer activity of the [Mn0.5Zn0.5](EuxNdxFe2-2x)O4 nanoferrites produced by modified sol-gel and ultrasonic methods

引用

CERAMICS INTERNATIONAL 2020年第6期46卷 7346-7354页

作者： Almessiere, M. A. Trukhanov, A., V Khan, F. A. Slimani, Y. Tashkandi, N. Turchenko, V. A. Zubar, T., I Tishkevich, D., I Trukhanov, S., V Panina, L., V Baykal, A. Imam Abdulrahman Bin Faisal Univ IRMC Dept Biophys POB 1982 Dammam 31441 Saudi Arabia Imam Abdulrahman Bin Faisal Univ Coll Sci Dept Phys POB 1982 Dammam 31441 Saudi Arabia NAS Belarus SSPA Sci & Pract Mat Res Ctr Minsk 220072 BELARUS South Ural State Univ Chelyabinsk 454080 Russia NUST MISiS Moscow 119049 Russia Imam Abdulrahman Bin Faisal Univ IRMC Dept Stem Cell Res PO-Box1982 Dammam 31441 Saudi Arabia Imam Abdulrahman Bin Faisal Univ IRMC Dept Nanomed Res POB 1982 Dammam 31441 Saudi Arabia Donetsk Inst Phys & Technol UA-03680 Kiev Ukraine Joint Inst Nucl Res Frank Lab Neutron Phys Dubna 141980 Russia Immanuel Kant Baltic Fed Univ Inst Phys Math & IT Kaliningrad 236041 Russia

[Mn0.5Zn0.5](EuxNdxFe2-2x)O(4 )ferrite nanoparticles (FNP) were obtained by ultrasonic (USM) and sol-gel (SGM) methods. It was observed that SGM allows us to produce nanoparticles with the average crystal size of 10-40 nm and the specific surface area of 5-7.5 x 10(4)m(2)/g with a strong correlation between the chemical composition (x) and the crystal size distribution. At the same time using USM, we obtained nanoparticles with the average crystal size of 3-15 nm and the specific surface area of 1.5-1.7 x 10(5)m(2)/g without a strong correlation between Eu/Nd concentration and the crystal size distribution. The specific surface area and average crystal size are the main factors determining the antiproliferative activity of FNP. The anti-cancer activity of FNP was investigated both on cancerous cells, human adenocarcinoma cells and human colorectal carcinoma cells. It was established that samples obtained using USM were more effective in producing cytotoxic effects on cancer cells. Thus, we confirm a strong correlation between the main microstructure parameters for [Mn0.5Zn0.5](EuxNdxFe2-2x)O-4 ferrite nanoparticles.

关键词： Nanoparticles Spinels Anti-cancer activity microstructure parameters

来源：评论

学校读者我要写书评

暂无评论

microstructure Features and the Macroscopic Acoustic Behavior of Gassy Silt in the Yellow River Delta

引用

Journal of Ocean University of China 2024年第2期23卷 371-382页

作者： LIU Tao GUO Zhenqi ZHANG Yan WU Chen LIU Lele DENG Shenggui Laboratory for Marine Geology Pilot National Laboratory for Marine Science and TechnologyQingdao 266061China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao 266100China College of Civil Engineering Anhui Jianzhu UniversityHefei 230601China The Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China College of Marine Geosciences Key Laboratory of Submarine Geosciences and ProspectingOcean University of ChinaQingdao 266100China

The morphological changes in isolated bubbles in gassy silt play a critical role in the microscopic structures between soil particles and bubbles and macroscopic physical *** on X-ray CT scanning experiments under various vertical loads(four levels),self-designed acoustic macro experiments,and a series of formula revisions to the macro-air-bearing silt sound-velocity prediction model,this paper discusses the macro-and micro-scale features of gassy silts from the Yellow River *** samples consisted of different proportions of silt from the Yellow River Delta and porous media,and they were used to form two types of aerosol silts with initial gas contents of 4.23%and 7.67%.The results show that the air bubble content and external load considerably affect the microstructural parameters and acoustic behavior of gassy silt in the Yellow River *** macroscopic sound velocity showed a linear positive correlation with vertical load and relation to microstructural parameters in varying manners and *** on the traditional Biot-Stoll acoustic model,the gas-phase medium coefficient was introduced for the proper calculation and prediction of the sound velocity of air-bearing *** errors of the overall prediction varied between 5.6%and 9.6%.

关键词： gassy silt vertical load microstructure parameters bubble vibration Biot-Stoll acoustic model

来源：评论

学校读者我要写书评

暂无评论

Application of phosphogypsum to solidification of silty soil: Mechanical properties and microstructure

引用

MECHANICS OF ADVANCED MATERIALS AND STRUCTURES 2022年第27期29卷 6026-6038页

作者： Ren, Haoming Liu, Wenbai Zhang, Dingwen Southeast Univ Sch Transportat Nanjing Jiangsu Peoples R China Southeast Univ Natl Demonstrat Ctr Expt Rd & Trafc Engn Educ Nanjing Jiangsu Peoples R China Shanghai Maritime Univ Coll Ocean Sci & Engn Shanghai Peoples R China

As a type of common industrial waste, phosphogypsum (PG) has raised concerns about environmental pollution and its comprehensive usage. However, scholars need to deepen the research on the application of PG in the solidification of silty soils. The impacts of PG on the microstructure and mechanical properties of solidified soil remain unknown under complex environmental conditions. Firstly, combined with several consolidation tests, this study analyses the impact of different PG contents on the compression modulus of silty soil with a cement-lime curing agent. Secondly, a scanning electron microscopy (SEM) test was used to take microscopic photos, and Image-Pro Plus 6.0 (IPP 6.0) software was used to process microscopic photos. Then, three microstructure parameters (Dp, Db and e) of solidified silty soil were calculated. Finally, the connection between the compression modulus and the microstructure parameters was assessed quantitatively. Results revealed that PG can stimulate the formation of calcium silicate hydrate (C-S-H) gels and react with calcium aluminate to produce ettringite. As a result, the compression modulus of solidified silty soil increased from approximately 7.39% to 51.3%. Given the excessive volume expansion produced by ettringite, the compression modulus with 4% of PG declined from 4.76% to 6.8% after reaching its maximum 24.98 MPa at 14 days of curing. A linear relationship was observed between the compression modulus and the three microstructure parameters at the declining stage of the compression modulus. The correlation coefficient R-2 of fitting lines were all greater than 0.9, thus representing the connection between the macroscopic mechanical properties and the microstructure of the solidified silty soil. This study seeks to provide theoretical basis and practical experiences for the efficient utilization of PG in the field of soil solidification.

关键词： Compression tests mechanical properties microstructure parameters phosphogypsum soil solidification

来源：评论

学校读者我要写书评

暂无评论

The Scatter in Fracture Toughness of Two Different Pearlitic Railway Wheels

引用

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE 2022年第11期31卷 9209-9219页

作者： Chen, Runnong Li, Zhaodong Zhao, Xinlong Zhou, Shitong Wang, Xin Da, Guangjie Zhang, Xiaofeng Zhang, Qifu Li, Xiaogang Cent Iron & Steel Res Inst Dept Struct Steels Beijing 100081 Peoples R China Univ Sci & Technol Beijing Inst Adv Mat & Technol Beijing 100083 Peoples R China Cent Iron & Steel Res Inst Natl Engn Lab Adv Coating Technol Met Beijing 100081 Peoples R China Taiyuan Heavy Ind Railway Transit Equipment Co Lt Taiyuan 030000 Peoples R China Nanchang Hangkong Univ Sch Aeronaut Mfg Engn Nanchang 330063 Jiangxi Peoples R China

This paper focuses on the effect of microstructural aspects on the statistical scatter of fracture toughness of two different pearlitic railway wheels. The microstructure and inclusions of compact tension specimens with the largest differences in fracture toughness of each wheel were quantified;it was found that the inhomogeneous distribution of the type, quantity, and size of inclusions deteriorated toughness to varying degrees, resulting in the scatter in fracture toughness. The tessellated stress of inclusions was calculated according to Brooksbank and Andrews's model. The diameter ratio of composite MnS-oxide to inner wrapped oxides in both wheels is more than 1.28 and without tessellated stress. The maximum tessellated stress generated by oxides of different quantities and sizes is equal, but the range of the stress field is positively related to its size and quantity. The mechanism of different inclusions affecting the fracture toughness scattering was discussed in combination with the fracture process. All three kinds of inclusions can promote ductile fracture through microvoid coalescence, and oxide can also indirectly induce cleavage crack and promote cleavage crack propagation through generating tessellated stress. The mechanism of oxide inclusions that do not directly induce cleavage cracks initiation is proposed.

关键词： fracture toughness microstructure parameters non-metallic inclusions pearlitic steel statistical scatter tessellated stress

来源：评论

学校读者我要写书评

暂无评论

Microscopic and Macroscopic Analysis of Purple Sweet Potato Dried Products Following Vacuum Steam Pulsation Blanching Pretreatment

引用

JOURNAL OF FOOD PROCESS ENGINEERING 2024年第12期47卷

作者： Wang, Dong Zhao, Yifan Niu, Yao Sun, Haoyuan Yuan, Yuejin Shaanxi Univ Sci & Technol Xian Shaanxi Peoples R China Shaanxi Res Inst Agr Prod Proc Technol Xian Shaanxi Peoples R China

To improve the drying efficiency and quality of purple sweet potatoes after blanching pretreatment, this study employed three methods: hot water blanching (HWB), microwave blanching (MB), and vacuum steam pulsed blanching (VSPB). The impact of different blanching methods on the microstructural parameters and macroscopic performance of purple sweet potatoes was investigated using techniques such as paraffin sectioning, microscopic observation, and image processing. The results indicated that, at the microscopic level, the proportion of large cells after VSPB was significantly higher than that after hot water and MB, being 15.81%, 5.15%, and 25.68%, respectively. At the macroscopic level, samples pretreated with VSPB had the shortest drying time (210 min), the highest rehydration ratio (RR) (3.988), and the best chewiness (2095.44 g). Further studies explored the effects of blanching vacuum degree, blanching time, and blanching frequency on the distribution of various microstructural parameters of purple sweet potato tissue cells. Through nonlinear polynomial fitting, a fitting equation was established between the microstructural parameters after VSPB and the macroscopic RR and browning index. The determination coeffi cients R2 of the established mathematical models and the predicted results were all greater than 0.8. The findings of this study provide an important reference for exploring the mechanism of the impact of VSPB pretreatment on the microstructural parameters and macroscopic performance of purple sweet potatoes and offer a theoretical basis for the design of drying equipment.

关键词： browning index microstructure parameters purple sweet potato rehydration ratio vacuum steam pulsed blanching

来源：评论

学校读者我要写书评

暂无评论

Quantitative prediction of Mg-RE-Ni alloy corrosion behavior by machine learning

引用

CORROSION SCIENCE 2024年 237卷

作者： Pei, Sanlve Dai, Chaoneng Yang, Xiaohua Zhang, Lijun Wang, Haitao Zhang, Shaolin Han, Yuexing Li, Qian Wang, Jingfeng Chongqing Univ Coll Mat Sci & Engn Natl Engn Res Ctr Magnesium Alloys Chongqing 400044 Peoples R China Inst Natl Rech Sci INRS Ctr Energie Mat Telecommun Varennes PQ J3X 1P7 Canada Cent South Univ State Key Lab Powder Met Changsha 410083 Peoples R China Inst Corros Sci & Technol Guangzhou 510530 Peoples R China Shanghai Univ Sch Comp Engn & Sci Shanghai 200444 Peoples R China

In this work, a prediction model, which can be used to reveal the corrosion mechanism and behavior of Mg-RE-Ni alloys, was successfully developed with machine learning. The model is constructed based upon the microstructure parameters of LPSO phase, and the accuracy of the prediction model is greater than 93 %. The results agree well with the literature when it is used to study the relationship of composition-structure-corrosion behavior of Mg-RE-Ni alloys. This work solves the shortcomings of experimental studies, which provide a route to quantitively analyze and reveal the corrosion mechanism of Mg-RE-Ni alloys.

关键词： Mg-RE-Ni alloys Corrosion mechanism Machine learning Corrosion model microstructure parameters

来源：评论

学校读者我要写书评

暂无评论

Effect of implanted copper into 1 μm cadmium telluride thick film by heat treatment for optoelectronics: Structural optical, and electrical properties

引用

INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2021年第14期45卷 20258-20269页

作者： Mahmoud, Safwat A. Al-Hossainy, Ahmed F. Shaaban, Essam R. Northern Border Univ Fac Sci Phys Dept Ar Ar Saudi Arabia New Valley Univ Fac Sci Chem Dept Al Kharga Egypt Northern Border Univ Fac Sci Chem Dept Ar Ar Saudi Arabia Al Azhar Univ Fac Sci Phys Dept PO 71452 Assiut Egypt

In this study, a cadmium telluride (CdTe) film with a thickness of 1 mu m was evaporated onto the glass substrate (at a constant temperature of 150 degrees C) using the evaporation technique. These films were immersed in a Cu(NO3)(2) (1 g/1000 mL) solution for 30 minutes to infuse copper onto CdTe film. In addition, the treated film was annealed in vacuum at different temperatures (125 degrees c, 250 degrees C, 375 degrees C, and 500 degrees C) for 30 minutes to allow the copper content to diffuse through CdTe through ion exchange process. (EDAX) defines the initial treatment recipe. Use the XRD pattern to calculate the structure (lattice strain and crystal size) of the pure and processed film. The Swanepoel's method is used to calculate the thickness and refractive index of the film. The energy gap of the film is calculated using experimental measurements of reflection and transmission in the strong absorption region. It is found that as the annealing temperature increases, the band gap decreases from 1.50 V to 1.37 eV. The dielectric constant of the film and the power loss function (VELF and SELF) are determined with the annealing temperature increases. Then the electrical properties were studied by the Hall effect, where it was found that the CdTe: Cu film corresponds to the p-type semiconductor. With the increase in annealing temperature, it was found that the resistance decreased from 133.9 x 10(-4) to 18.5 x 10(-4) Omega cm and the carriers concentration was reduced from 46.7 x 10(18) to 23.3 x 10(18) cm(-3). Moreover, the hall mobility increased from 10 to 146 cm(2 )V s(-1). All these changes of annealed CdTe:Cu films whether optical or electrical, make them candidates for solar cell applications.

关键词： CdS/CdTe:Cu solar cells CdTe:Cu films dielectric constants microstructure parameters optical constants photoluminescence spectra

来源：评论

学校读者我要写书评

暂无评论

microstructure Characteristics of ECAP Processed 1050 Aluminum After Deformation and 5 Years Later

引用

METALS AND MATERIALS INTERNATIONAL 2021年第8期27卷 2720-2731页

作者： Wronski, M. Wierzbanowski, K. Malik, R. Wronski, S. Wojtas, D. Baczmanski, A. Tarasiuk, J. AGH Univ Sci & Technol Fac Phys & Appl Comp Sci PL-30059 Krakow Poland

Modification of microstructure parameters of severely deformed 1050 aluminum after 5 years of recovery at ambient temperature was studied. The samples of 1050 aluminum were extruded using ECAP technique. The EBSD maps were recorded for the initial material and for the deformed samples. Next, the latter samples were left at ambient temperature during 5 years and a full EBSD study of the material was repeated. It was found that all microstructure parameters and textures have changed after this period. This is due to recovery and partial recrystallization, which took place in the samples during 5 years. The presented modifications of material microstructure are important, e.g., in the aspect of long time service of mechanical parts produced by severe plastic deformation techniques. Graphic

关键词： Severe plastic deformation Equal channel angular pressing Electron backscatter diffraction microstructure parameters Texture Recovery

来源：评论

学校读者我要写书评

暂无评论

Assessing the effects of mechanical damage on optical properties of strawberries in the 950-1650 nm range

引用

POSTHARVEST BIOLOGY AND TECHNOLOGY 2024年 218卷

作者： Ma, Yunyun Yang, Mianqing Zhao, Qingdian Li, Daocheng Liu, Dayang Northeast Forestry Univ Coll Comp & Control Engn Harbin 150040 Heilongjiang Peoples R China

To investigate the effect mechanism of early damage on optical properties of strawberries, the optical parameters, internal qualities and microstructure parameters of bruised samples and intact ones were acquired and quantitatively analyzed. The results showed that the soluble solids content increased with damage time, while the moisture content decreased. Firmness showed no difference between intact and bruised samples. The cell circularity (Cc) initially decreased, then slightly increased over damage time. The average cell diameter (Davg) increased with longer damage durations, and the average values of cell wall thickness (Tcw) decreased with longer damage durations. The absorption coefficient (mu alpha) values of bruised samples were higher than the intact ones at 970 nm and 1190 nm. For reduced scattering coefficient (mu ' s), at 970 nm and 1190 nm, differences were observed between intact strawberries and bruised samples subjected to three different durations of damage. The average R values of mu ' s with Cc, Tcw and Davg were 0.79, 0.93 and -0.93, respectively, confirming a strong correlation of mu ' s with cell diameter and cell wall thickness. The support vector machine classification model built based on mu alpha spectra had better performance than that based on mu ' sspectra, and the model based on combinations of mu alpha and mu ' s (mu eff) exhibited the highest accuracy for both the calibration set and prediction set with accuracies of 96.00% and 92.19%, respectively. The study provides a theoretical basis for detecting latent damaged strawberries based on optical properties.

关键词： Internal qualities microstructure parameters Absorption coefficient Reduced scattering coefficient Classification

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：