On mechanical and mathematical models in Yanbin Wang et al.‘s six papers on mechanical analysis of marine riser

Zhang, Hongchao; Li, Zifeng; Song, Guangming; Huang, Haihe; Zhang, Minglei; Zhang, Jie; Li, Shenghui; Xu, Wenwen; Liu, Shuai

doi:10.1016/j.rineng.2019.100076

Cited by 5 publications

(6 citation statements)

References 9 publications

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“…Simplifications in mathematical and mechanical models for simulation are the two main reasons for the error modeling in the field scale. For example, incorrect assumptions in key parameters, incorrect boundary conditions, and the use of incorrect differential equations can cause deviations [24]. Considering finer grids close to the wellbore improves the accuracy of the analysis.…”

Section: Solid Mechanics Resultsmentioning

confidence: 99%

Solid-geo-mechanical investigation of the effect of salt creep on casing stability using finite element method: a case study

2020

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The salt formation creeping can significantly affect the casing stability, because of the changes in mechanical and geomechanical parameters. The creeping of Gachsaran salty formation in the south part of Iran has influences on wells drilled in the region, which should be carefully considered in the casing design process. In this study, the finite element analysis technique was applied to study the alteration in mechanical/geomechanical parameters of a well in this formation. The accuracy of the methodology was validated by data available from the reduction in wellbore diameter of another well in the formation. Different scenarios were studied to analyze the effect of geomechanical parameters on stress, plastic strain, and casing diameter for a cased cemented well and a well completed with two casings. The effect of mechanical parameters on casing collapse was studied, where casing eccentricity, ovality, and slenderness ratio were also considered. Our simulation studies showed that casing stability in salty formations is strongly affected by geomechanical and pipe mechanical parameters. To reduce the severity of the casing collapse in salty formation, it is recommended to complete the well with two casings. Our study showed that, this arrangement reduces the plastic strain and the change in casing diameter significantly For a safe casing design, effect of mechanical parameters should be also considered. Effects of parameters such as ovality, eccentricity, and slenderness ratio are noticeable, for example, 2% ovality and 2% eccentricity in L-80 casing, lead to increase in the plastic strain from 0.112 to 0.31 and 0.3, and the overall diameter reduction from 0.455″ to 0.685″ and 0.535″, respectively.

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Section: Solid Mechanics Resultsmentioning

confidence: 99%

Solid-geo-mechanical investigation of the effect of salt creep on casing stability using finite element method: a case study

2020

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“…Though the evolution of lithium-sulfur batteries has increased some hope for evidence-based deterioration and high energy storage, most of them are focused on experimental research, but there are few theoretical studies. The shortcomings and challenges of LSB indicate that the material and structure of LSB still have numerous of difficulties to surmount, and it is important to establish a complete theoretical system for the study of LSB [13].…”

Section: Future Research Prospects Of Lsbmentioning

confidence: 99%

A comparison study between the lithium sulphur battery and fuel cell in new energy vehicle applications

Gan,

Li,

2023

J. Phys.: Conf. Ser.

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In recent years, the development of new energy vehicles has been rapid to solve the emerging energy depletion and carbon emission problems. Lithium-sulfur batteries and fuel batteries have become the most competitive two development directions in the new generation of power batteries for electric vehicle applications. Lithium-sulfur battery has a high specific capacity, low production cost and is environmentally friendly. However, some problems include low coulomb efficiency and short life span in the process of lithium-sulfur battery production. Fuel cells are also environmentally friendly, energy-efficient and drive efficiently. But fuel cells are extremely expensive, and their longevity problems regarding the membranes and electrode materials and supporting infrastructure, such as the hydrogen and oxygen storage obstacles, must also be overcome. This paper focuses on analyzing the two new energy vehicle power resource principles, advantages and disadvantages of two kinds of typical batteries, the current development bottleneck, and respectively put forward suggestions for future development.

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“…Effects of salt stress conditions on crop seed germination, growth, development, and gene expression [11]. Salt stress can have varying degrees of impact on the entire development period of crops, and hinder the improvement of crop growth quality [12]. In addition, soil salinization also affects surface and underground water quality, animal and plant communities, and human health, posing a serious threat to the ecological environment and biosphere [13].…”

Section: Background and Motivationmentioning

confidence: 99%

Application of a Bi-Directional Gated Recurrent Unit Combined with a Recurrent Neural Network Model Based on Fusion Attention Mechanism in Estimating Soil Salinity

Zhao,

Wang,

Zhang

2023

Preprint

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Soil salinization is an important limiting factor for agricultural and environmental sustainable development. To achieve rapid and accurate identification of soil salt content, a classification model called Attention-bidirectional gate recurrent unit recurrent neural network (Att-BiGRU-RNN) is designed, incorporating the fusion of attention mechanism. In the encoding and decoding modules of the model, BiGRU and RNN structures are used, enabling the extraction of deep spectral features by leveraging the correlation between spectral information in different bands of hyperspectral data. The attention mechanism is introduced to dynamically allocate weight information based on the differences in spectral information, thereby increasing the contribution of important spectral features to the classification model and improving the accuracy of the model. The research area is initially set in Dinge County, Shaanxi Province, China. Field spectroscopy measurements of 120 samples of original and air-dried soils are conducted using a ground-based spectrometer. Different mixed models for estimating soil salt content, including FDT-SVR, FDT-CNN, BiGRU-RNN, and Att-BiGRU-RNN, are constructed and validated and compared. The results show that compared to other models, the Att-BiGRU-RNN model optimized by the attention mechanism exhibits the highest prediction accuracy, with a coefficient of determination R2 = 0.932 and root mean square error RMSE = 0.012. Additionally, the model's recall curve at different precision levels is obtained to meet the parameter selection requirements under different estimation demands. This method can effectively identify areas with high soil salt content or severe salinization based on portable hyperspectral sensors and unmanned aerial vehicle platforms, and statistically analyze the distribution of soil salt content.

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On mechanical and mathematical models in Yanbin Wang et al.‘s six papers on mechanical analysis of marine riser

Cited by 5 publications

References 9 publications

Solid-geo-mechanical investigation of the effect of salt creep on casing stability using finite element method: a case study

Solid-geo-mechanical investigation of the effect of salt creep on casing stability using finite element method: a case study

A comparison study between the lithium sulphur battery and fuel cell in new energy vehicle applications

Application of a Bi-Directional Gated Recurrent Unit Combined with a Recurrent Neural Network Model Based on Fusion Attention Mechanism in Estimating Soil Salinity

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