检索结果-南通市图书馆

Physics-informed optimization for a data-driven approach in landslide susceptibility evaluation

Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3192-3205页

作者： Songlin Liu Luqi Wang wengang zhang Weixin Sun Yunhao Wang Jianping Liu School of Civil Engineering Chongqing UniversityChongqing400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityMinistry of EducationChongqing400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing UniversityChongqing400045China Chongqing Field Scientific Observation Station for Landslide Hazards in Three Gorges Reservoir Area Chongqing UniversityChongqing400045China Chongqing Mingfeng Construction Engineering Co. LtdChongqing405800China

Landslide susceptibility mapping is an integral part of geological hazard ***,the emphasis of many studies has been on data-driven models,notably those derived from machine learning,owing to their aptitude for tackling complex non-linear ***,the prevailing models often disregard qualitative research,leading to limited interpretability and mistakes in extracting negative samples,*** non-landslide *** this study,Scoops 3D(a three-dimensional slope stability analysis tool)was utilized to conduct a qualitative assessment of slope stability in the Yunyang section of the Three Gorges Reservoir *** depth of the bedrock was predicted utilizing a Convolutional Neural Network(CNN),incorporating local boreholes and building on the insights from prior *** Random Forest(RF)algorithm was subsequently used to execute a data-driven landslide susceptibility *** proposed methodology demonstrated a notable increase of 29.25%in the evaluation metric,the area under the receiver operating characteristic curve(ROC-AUC),outperforming the prevailing benchmark ***,the landslide susceptibility map generated by the proposed model demonstrated superior *** result not only validates the effectiveness of amalgamating mathematical and mechanistic insights for such analyses,but it also carries substantial academic and practical implications.

关键词： Physics-informed Machine learning Bedrock depth Scoops 3D Landslide susceptibility

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The new criteria for differential diagnosis of indeterminate biliary stricture under super minimally invasive peroral cholangioscopy

引用

Chinese Medical Journal 2024年第3期137卷 255-256页

作者： wengang zhang Ningli Chai Qingzhen Wu Enqiang Linghu Department of Gastroenterology Chinese PLA General HospitalBeijing 100853China

Indeterminate biliary stricture(IBS)refers to biliary stricture with an uncertain histological diagnosis^([1])and can be classified as non-neoplastic stricture or neoplastic *** former is mainly caused by various inflammatory biliopancreatic diseases,congenital malformations,or postoperative bile duct injury,while the latter exists in neoplastic lesions such as cholangiocarcinoma,invasion from pancreatic cancer,and adenomas in the bile *** non-neoplastic strictures can be relieved by endoscopic or conservative medical treatment,and only a few require surgical ***,radical surgery or palliative biliary drainage should be applied for neoplastic strictures according to the progression of the ***,it is essential to obtain an accurate diagnosis for IBS in clinical work.

关键词： diagnosis stricture biliary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

System reliability-based robust design of deep foundation pit considering multiple failure modes

引用

Geoscience Frontiers 2024年第2期15卷 169-182页

作者： Li Hong Xiangyu Wang wengang zhang Yongqin Li Runhong zhang Chunxia Chen School of Civil Engineering Chongqing UniversityChongqing 400045China School of Design and the Built Environment Curtin UniversityBentley 6102Western AustraliaAustralia Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China Institute of Smart City and Intelligent Transportation Southwest Jiaotong UniversityChengdu 610097China China Southwest Geotechnical Investigation&Design Institute Co. LtdChengdu 610052SichuanChina

Recently,reliability-based design is a universal method to quantify negative influence of uncertainty in geotechnical ***,for deep foundation pit,evaluating the system safety of retaining structures and finding cost-effective design points are main *** address this,this study proposes a novel system reliability-based robust design method for retaining system of deep foundation pit and illustrated this method via a simplified case history in Suzhou,*** proposed method included two parts:system reliability model and robust design *** Propagation Neural Network(BPNN)is used to fit limit state functions and conduct efficient reliability *** common source random variable(CSRV)model are used to evaluate correlation between failure modes and determine the system ***,based on the system reliability model,a robust design method is *** method aims to find cost-effective design *** solve this problem,the third generation non-dominated genetic algorithm(NSGA-III)is *** efficiency and accuracy of whole computations are improved by involving BPNN models and NSGA-III *** proposed method has a good performance in locating the balanced design point between safety and construction ***,the proposed method can provide design points with reasonable stiffness distribution.

关键词： System reliability Machine learning method Non-dominated sorting genetic algorithm Robust design Multiple objective optimization models

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于多源数据与机器学习的降雨型滑坡灾害危险性动态预警

引用

地质论评 2024年第S1期70卷 217-218页

作者：付杰张青仉文岗中国地质调查局水文地质环境地质调查中心河北保定071051 重庆大学土木工程学院重庆400044

降雨型滑坡灾害是三峡库区发育的主要地质灾害之一,区域滑坡灾害危险性预警对滑坡风险减缓有重要意义。针对区域滑坡灾害危险性预警的时效性等问题,本文以重庆市云阳县为研究区,提出了基于多源数据与机器学习的滑坡灾害危险性动态预警方... 详细信息

降雨型滑坡灾害是三峡库区发育的主要地质灾害之一,区域滑坡灾害危险性预警对滑坡风险减缓有重要意义。针对区域滑坡灾害危险性预警的时效性等问题,本文以重庆市云阳县为研究区,提出了基于多源数据与机器学习的滑坡灾害危险性动态预警方法(图1)。1滑坡易发性空间预测滑坡易发性预测可准确地预测出潜在滑坡空间分布规律(黄发明等,2020;林高聪等,2023)。

关键词：降雨型滑坡滑坡危险性动态预警机器学习多源数据

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

温度影响下石窟砂岩力学特性试验研究

引用

岩石力学与工程学报 2024年第S1期43卷 3310-3320页

作者：朱鹏熹王成龙蒋思维仉文岗陈卉丽重庆大学土木工程学院重庆400045 大足石刻研究院重庆402360 重庆市地质矿产勘查开发局重庆401121

石窟寺所处环境长期面临着冷热交替作用,温度变化往往导致石窟围岩的力学性质发生变化。以重庆大足石刻石窟砂岩为研究对象,通过单轴压缩试验和巴西劈裂试验,对石窟砂岩的力学特性展开试验研究,分析不同温度和冷热循环条件下的石窟砂岩... 详细信息

石窟寺所处环境长期面临着冷热交替作用,温度变化往往导致石窟围岩的力学性质发生变化。以重庆大足石刻石窟砂岩为研究对象,通过单轴压缩试验和巴西劈裂试验,对石窟砂岩的力学特性展开试验研究,分析不同温度和冷热循环条件下的石窟砂岩的应力-应变曲线、岩石强度、峰值应力和应变、弹性模量和破坏形态。结果表明:(1)10次冷热循环后,砂岩的单轴抗压强度降低,其中相较于自然冷却,水冷却循环会显著减小砂岩的单轴抗压强度。砂岩的抗拉强度受冷却方式影响较大,低温水冷却循环下砂岩的抗拉强度最小。(2)10次冷热循环作用后,砂岩的峰值应变降低。相较于自然冷却,水冷却循环会减小石窟砂岩的弹性模量,当冷热循环次数由5次增加到10次时,砂岩的弹性模量也会减小。(3)砂岩在单轴压缩下的破坏模式以剪切破坏为主,而冷热循环作用后砂岩破坏模式变复杂。砂岩在巴西劈裂下的破坏形式的主要区别在于裂纹形态和数量,遇水冷却循环作用后,砂岩主裂纹由直线形向弧形转化,或产生次裂纹。

关键词：岩石力学石窟砂岩温度影响单轴压缩巴西劈裂力学特性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

纳米金刚石在润滑抗磨和节能减排方面的研究及应用

引用

当代石油石化 2024年第7期32卷 42-48页

作者：张文刚张书达天津乾宇超硬科技股份有限公司天津300384 河南元素金刚石工业有限公司河南商丘476200

综述纳米金刚石在发动机油、齿轮油、液压油等润滑油领域发挥润滑抗磨和节能减排作用的研究与应用进展。粒径在4.8~5.4 nm的金刚石微粒经特殊表面改性后悬浮于润滑油中,制成纳米金刚石润滑油,可将滑动摩擦变为滚动摩擦,将化学吸附膜变... 详细信息

综述纳米金刚石在发动机油、齿轮油、液压油等润滑油领域发挥润滑抗磨和节能减排作用的研究与应用进展。粒径在4.8~5.4 nm的金刚石微粒经特殊表面改性后悬浮于润滑油中,制成纳米金刚石润滑油,可将滑动摩擦变为滚动摩擦,将化学吸附膜变为物理吸附膜,其油膜承载能力成倍提高,油膜硬度提高2.6倍,减摩抗磨、减振降噪作用明显。纳米金刚石发动机油可全面改善发动机排放性、动力性、经济性、清净性,使发动机出水温度和排气温度降低12℃,缸套表面硬度提高9.28%,具有免拆卸清洗功能。纳米金刚石齿轮油可使钢磨损量降低70%~82%,提高机械传动效率。纳米金刚石液压油可在50 MPa的超高压下使内漏减少36.8%,有效缓解长期存在的机床爬行问题。

关键词：纳米金刚石润滑油节能减排减振降噪免拆卸清洗自修复

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

藜麦富硒萌发工艺优化及抗氧化活性研究

引用

食品与机械 2024年第7期40卷 175-182页

作者：张玲郑万财兰永丽张文刚青海大学农林科学院青海西宁810016 青海省青藏高原农产品加工重点实验室青海西宁810016 青海省种质资源研究与利用实验室青海西宁810016 西北农林科技大学食品科学与工程学院陕西咸阳712100

[目的]提高藜麦种子有机硒含量,开发优质富硒藜麦食品原料。[方法]以青白藜1号为原料,亚硒酸钠为硒源,通过单因素试验结合正交试验对藜麦富硒萌发工艺条件进行优化,进一步对富硒藜麦可溶性蛋白、多酚含量及抗氧化能力进行分析。[结果]... 详细信息

[目的]提高藜麦种子有机硒含量,开发优质富硒藜麦食品原料。[方法]以青白藜1号为原料,亚硒酸钠为硒源,通过单因素试验结合正交试验对藜麦富硒萌发工艺条件进行优化,进一步对富硒藜麦可溶性蛋白、多酚含量及抗氧化能力进行分析。[结果]藜麦富硒萌发最佳工艺条件为亚硒酸钠溶液质量浓度20 mg/L、浸泡温度25℃、浸泡时间6 h、浸泡液pH 7.0、萌发时间48 h、萌发温度20℃。该条件下,富硒萌发藜麦有机硒含量为349.52μg/kg。富硒萌发藜麦游离酚(236.35 mg/100 g)、结合酚(198.31 mg/100 g)含量最高,普通去离子水萌发藜麦可溶性蛋白(22.18%)含量最高。富硒萌发藜麦可溶性蛋白、游离酚和结合酚的抗氧化活性均最强,其次为普通去离子水萌发藜麦,未处理藜麦相对最低。[结论]富硒萌发能够显著提升藜麦有机硒、可溶性蛋白和多酚含量,并增强其抗氧化能力。

关键词：藜麦有机硒萌发工艺优化抗氧化活性

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

不同稳定化处理对青稞籽粒储藏稳定性的影响

引用

食品科技 2024年第3期49卷 173-182页

作者：党斌景孝男张杰张文刚杨希娟青海大学青海西宁810016 青海省青藏高原农产品加工重点实验室青海西宁810016 北京红星股份有限公司北京101400

为明确不同稳定化处理对青稞籽粒储藏特性的影响,以未处理青稞为对照,通过比较过热蒸汽、远红外和微波3种方式处理的青稞籽粒在储藏过程中脂肪酶活性、脂肪酸值、过氧化值、丙二醛值等的变化,明确不同稳定化处理效果之间的差异,确定稳... 详细信息

为明确不同稳定化处理对青稞籽粒储藏特性的影响,以未处理青稞为对照,通过比较过热蒸汽、远红外和微波3种方式处理的青稞籽粒在储藏过程中脂肪酶活性、脂肪酸值、过氧化值、丙二醛值等的变化,明确不同稳定化处理效果之间的差异,确定稳定化处理青稞的方式。结果表明,过热蒸汽处理条件为温度190℃,时间为70 s;远红外处理条件为面火、底火均为150℃,烘烤40 min;微波处理条件为功率800 W,时间为150 s。在以上条件下青稞籽粒脂肪酶活力下降至较低水平。在加速储藏过程中,对照和稳定化处理后青稞含水量在前30 d内水分含量会逐渐升高,30 d以后水分含量逐渐下降并趋于平衡,脂肪酶的活性、脂肪酸值及菌落总数和霉菌总数均呈升高趋势,且对照青稞脂肪酸值显著上升(P0.05),对照在20 d后丙二醛含量开始迅速上升。过热蒸汽处理抑制青稞籽粒脂肪酶活性、脂肪氧化及减菌效果相对较好,远红外、微波次之。因此,确定过热蒸汽处理(190℃、70 s)为青稞籽粒稳定化的有效方式。此结果为提高青稞籽粒储藏稳定性提供了参考。

关键词：青稞过热蒸汽远红外微波储藏稳定性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Use of soft computing techniques for tunneling optimization of tunnel boring machines

引用

Underground Space 2021年第3期6卷 233-239页

作者： Isam Shahrour wengang zhang College of Civil Engineering Tongji UniversityShanghai 200092China Laboratoire Genie Civil et geo-Environnement Universite de LilleFrance School of Civil Engineering Chongqing UniversityChina

Thanks to advances in tunnel boring machine(TBM)and monitoring,significant progress has been achieved in the application of soft computing techniques for the optimization of TBM tunneling and the reduction of disturbance related to tunneling in urban *** experimental,analytical,and numerical methods have limitations in solving problems related to TBM tunneling,engineers can use soft computing techniques in analyzing the relationship between the target tunneling responses and influential design inputs parameters,including the geometrical,geological,and TBM operational *** techniques are useful in achieving robust and low-cost ***,engineers face difficulties in making an optimal choice of the soft computing technique to solve the complex problems related to TBM *** help with this choice,this study presents state of the art about the use of soft computing techniques in TBM tunneling through practical *** study proposes recommendations for the optimal use of these techniques,in particular(i)the importance of preliminary analyses for the selection and reduction of input parameters,(ii)the necessity to complete insufficient data using laboratory tests and numerical modeling,(iii)the selection of reduced number of hidden layers and nodes to avoid overfitting,(iv)the use of recurrent neural networks to deal with time-series data,and(v)the association of soft computing methods with hybrid optimization techniques to reduce the risk of convergence to local minima.

关键词： Soft computing Tunneling Tunnel boring machine Artificial neural network Machine learning Optimization Settlement Convergence Artificial intelligence

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Reliability-based robust geotechnical design of braced excavations considering multiple failure modes

引用

Underground Space 2023年第2期9卷 43-52页

作者： Li Hong Xiangyu Wang wengang zhang School of Civil Engineering Chongqing UniversityChongqing 400045China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing UniversityChongqing 400045China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing 400045China School of Design and the Built Environment Curtin UniversityBentley 6102Western AustraliaAustralia

Reliability design of braced excavation is still a challenge for geotechnical *** design is a normal method to control the safety and cost of braced *** study presents an advanced reliability-based robust geotechnical design method,which can consider multiple failures and uncertainty of statistical information.A universal design sample was conducted to verify the necessity of considering the uncertainty of statistical *** limit state and serviceability limit state of braced excavations were defined,and point estimating method was used to evaluate the standard deviation of failure ***-objective and three-objective optimization models were developed to illustrate the application of proposed methods in *** addition,the performance of optimization algorithms and further application of multiple-objective models were *** results from this study indicate that the proposed method has a good performance in determining the optimal design with reasonable robustness and *** algorithms have higher efficiency in solving nonlinear and multiple-objective optimization problems than the 2nd Non-dominated sorting genetic *** study can guide the design of retaining systems of braced excavations in clay.

关键词： Robust geotechnical design Multi-objective optimization Multiple failure modes Genetic algorithm Statistical uncertainty

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：