期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到1,069篇文章
< 1 2 … 54 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Study on shape factor of the fusion-solidification zone of electron beam weld 认领 引用 被引量：2
1
作者 王亚军 关永军 +2 位作者 付鹏飞 危银涛 卢志军 《China Welding》 EI CAS 2008年第4期62-67,共6页
The concept of shape factors of the fusion-solidification zone is proposed to describe the weld cross section geometry. According to these shape factors, the electron beam weld fusion-solidification zone is divided in... The concept of shape factors of the fusion-solidification zone is proposed to describe the weld cross section geometry. According to these shape factors, the electron beam weld fusion-solidification zone is divided into four typical shapes and the classification criterion for these typical shapes is suggested. An integrated parameter n, combining the line power density of electron beam and material thermal properties is proposed to describe the relative power input, and another integrated parameter n2 combing the accelerating voltage and focusing current is proposed to reflect the power distribution in the keyhole. A series of new expressions, which can reflect the influence of focusing current, accelerating voltage, beam current, and material thermal properties, are developed to predict the fusion-solidification zone shape based on experimental results nonlinear fitting of n1 and n2. 展开更多
关键词 eleetron beam weld fusion-solidification zone shape factor mathematical model
暂未订购 下载PDF
The influence of joint geometric parameters on shape factor of butt joint with center through crack 认领 引用
2
作者 张敬强 杨建国 +3 位作者 王涛 刘雪松 董志波 方洪渊 《China Welding》 EI CAS 2012年第2期52-54,共3页
In this research, the influence of such joint geometric parameters as weld width and reinforcement on shape ~actor of butt joint with center crack subjected to static loading was investigated by finite element analyse... In this research, the influence of such joint geometric parameters as weld width and reinforcement on shape ~actor of butt joint with center crack subjected to static loading was investigated by finite element analyses method. According to the analytical resuhs, a well fracture resistant joint shape of butt joint with center crack has been approved. 展开更多
关键词 joint geometric parameters butt joint with center crack shape factor
暂未订购 下载PDF
A Perfect Shape Factor Corresponding States Principle for Pure Non-Polar and Polar Fluids 认领 引用
3
作者 陈新志 王连尉 侯虞钧 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2001年第4期421-426,共6页
In the two-parameter corresponding states principle(CSP), the critical compressibility factors of the fluid under study(called 'a' fluid) and the reference fluid(called 'o' fluid) must be identical. Th... In the two-parameter corresponding states principle(CSP), the critical compressibility factors of the fluid under study(called 'a' fluid) and the reference fluid(called 'o' fluid) must be identical. This is not generally observed in nature. To overcome this limitation, a perfect shape factor CSP is proposed in which the compressibility factors of 'a' and 'o' fluids are corresponded perfectly by introducing a new pressure shape factor 8. Using methane as the 'o' fluid, the shape factors of many fluids are calculated from PVT properties at saturation state and the second virial coefficients. Models are also formulated for the shape factors with the assumption of is a function of temperature and volume while 6 and 5 are temperature dependent only. The models described the shape factors satisfactorily in whole region including vapor, liquid and their co-existing phases. The perfect shape factor CSP could be applied for both polar and non-polar fluids. 展开更多
关键词 perfect shape factor corresponding states principle thermodynamic property equation of state
暂未订购 下载PDF
Optimal Shape Factor and Fictitious Radius in the MQ-RBF:Solving Ill-Posed Laplacian Problems 认领 引用
4
作者 Chein-Shan Liu Chung-Lun Kuo Chih-Wen Chang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第6期3189-3208,共20页
To solve the Laplacian problems,we adopt a meshless method with the multiquadric radial basis function(MQRBF)as a basis whose center is distributed inside a circle with a fictitious radius.A maximal projection techniq... To solve the Laplacian problems,we adopt a meshless method with the multiquadric radial basis function(MQRBF)as a basis whose center is distributed inside a circle with a fictitious radius.A maximal projection technique is developed to identify the optimal shape factor and fictitious radius by minimizing a merit function.A sample function is interpolated by theMQ-RBF to provide a trial coefficient vector to compute the merit function.We can quickly determine the optimal values of the parameters within a preferred rage using the golden section search algorithm.The novel method provides the optimal values of parameters and,hence,an optimal MQ-RBF;the performance of the method is validated in numerical examples.Moreover,nonharmonic problems are transformed to the Poisson equation endowed with a homogeneous boundary condition;this can overcome the problem of these problems being ill-posed.The optimal MQ-RBF is extremely accurate.We further propose a novel optimal polynomial method to solve the nonharmonic problems,which achieves high precision up to an order of 10−11. 展开更多
关键词 Laplace equation nonharmonic boundary value problem Ill-posed problem maximal projection optimal shape factor and fictitious radius optimal MQ-RBF optimal polynomial method
暂未订购 下载PDF
Significance of including lid thickness and particle shape factor in numerical modeling for prediction of particle trap efficiency of invert trap 认领 引用
5
作者 Salman Beg Deo Raj Kaushal 《Water Science and Engineering》 EI CAS CSCD 2024年第2期166-176,共11页
Sediment accumulation on the bed of open sewers and drains reduces hydraulic efficiency and can cause localized flooding.Slotted invert traps installed underneath the bed of open sewers and drains can eliminate sedime... Sediment accumulation on the bed of open sewers and drains reduces hydraulic efficiency and can cause localized flooding.Slotted invert traps installed underneath the bed of open sewers and drains can eliminate sediment build-up by catching sediment load.Previous three-dimensional(3D)computational studies have examined the particle trapping performance of invert traps of different shapes and depths under varied sediment and flow conditions,considering particles as spheres.For two-dimensional and 3D numerical modeling,researchers assumed the lid geometry to be a thin line and a plane,respectively.In this 3D numerical study,the particle trapping efficiency of a slotted irregular hexagonal invert trap fitted at the flume bottom was examined by incorporating the particle shape factor of non-spherical sewage solid particles and the thicknesses of upstream and downstream lids over the trap in the discrete phase model of the ANSYS Fluent 2020 R1 software.The volume of fluid(VOF)and the realizable k-turbulence models were used to predict the velocity field.The two-dimensional particle image velocimetry(PIV)was used to measure the velocity field inside the invert trap.The results showed that the thicknesses of upstream and downstream lids affected the velocity field and turbulent kinetic energy at all flow depths.The joint impact of the particle shape factor and lid thickness on the trap efficiency was significant.When both the lid thickness and particle shape factor were considered in the numerical modeling,trap efficiencies were underestimated,with relative errors of-8.66%to-0.65%in comparison to the experimental values of Mohsin and Kaushal(2017).They were also lower than the values predicted by Mohsin and Kaushal(2017),which showed an overall overestimation with errors of-2.3%to 17.4%. 展开更多
关键词 Invert trap Lid thickness Particle image velocimetry Particle shape factor Turbulent kinetic energy Scanning electron microscope
暂未订购 下载PDF
Rapid Measurement of Elastic Modulus for Shaped Ceramic Tiles Based on Impulse Excitation Technique 认领 引用
6
作者 SONG Yanyan FENG Zhiyuan +2 位作者 WANG Han WU Gang FAN Muxu 《China's Refractories》 CAS 2026年第1期12-16,共5页
This study addresses the challenge of directly determining the elastic modulus of complex shaped ceramic products—such as gas turbine combustor tiles—using conventional standardized methods,which are limited by spec... This study addresses the challenge of directly determining the elastic modulus of complex shaped ceramic products—such as gas turbine combustor tiles—using conventional standardized methods,which are limited by specimen geometry.A rapid,non-destructive testing method based on the impulse excitation technique(IET)and a shape factor coefficient was proposed.Three types of shaped ceramic tiles were selected.The elastic modulus of standard rectangular specimens obtained by destructive sampling was used as the reference value,and the shape factor coefficient for each tile type was calibrated by combining the mass and fundamental frequency of the whole tile.Using this coefficient,the elastic modulus of whole tiles was calculated solely from non-destructively measured mass and frequency.The results show that the deviation between the elastic modulus derived from the proposed method and that from destructive testing is less than 5%,confirming the accuracy and reliability of the approach.The method overcomes the shape restrictions inherent in traditional testing,offering a fast,non-destructive solution suitable for onsite quality assessment and process control during the production of shaped ceramic components. 展开更多
关键词 elastic modulus shape factor coefficient rapid testing shaped ceramic tiles
暂未订购 下载PDF
Benchmarking the composite performance of distinct shapes of ferrometallic gold nanoshells:photothermal cancer therapy 认领 引用 被引量：2
7
作者 Sara I.Abdelsalam Essam T.Abdelwahab +2 位作者 I.M.Eldesoky Ramzy M.Abumandour M.M.Ahmed 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2025年第6期3-15,共13页
This article presents a detailed theoretical hybrid analysis of the magnetism and the thermal radiative heat transfer in the presence of heat generation affecting the behavior of the dispersed gold nanoparticles(AuNPs... This article presents a detailed theoretical hybrid analysis of the magnetism and the thermal radiative heat transfer in the presence of heat generation affecting the behavior of the dispersed gold nanoparticles(AuNPs)through the blood vessels of the human body.The rheology of gold-blood nanofluid is treated as magnetohydrodynamic(MHD)flow with ferromagnetic properties.The AuNPs take different shapes as bricks,cylinders,and platelets which are considered in changing the nanofluid flow behavior.Physiologically,the blood is circulated under the kinetics of the peristaltic action.The mixed properties of the slip flow,the gravity,the space porosity,the transverse ferromagnetic field,the thermal radiation,the nanoparticles shape factors,the peristaltic amplitude ratio,and the concentration of the AuNPs are interacted and analyzed for the gold-blood circulation in the inclined tube.The appropriate model for the thermal conductivity of the nanofluid is chosen to be the effective Hamilton-Crosser model.The undertaken nanofluid can be treated as incompressible non-Newtonian ferromagnetic fluid.The solutions of the partial differential governing equations of the MHD nanofluid flow are executed by the strategy of perturbation approach under the assumption of long wavelength and low Reynolds number.Graphs for the streamwise velocity distributions,temperature distributions,pressure gradients,pressure drops,and streamlines are presented under the influences of the pertinent properties.The practical implementation of this research finds application in treating cancer through a technique known as photothermal therapy(PTT).The results indicate the control role of the magnetism,the heat generation,the shape factors of the AuNPs,and its concentration on the enhancement of the thermal properties and the streamwise velocity of the nanofluid.The results reveal a marked enhancement in the temperature profiles of the nanofluid,prominently influenced by both the intensified heat source and the heightened volume fractions of the nanoparticles.Furthermore,the platelet shape is regarded as most advantageous for heat conduction owing to its highest effective thermal conductivity.AuNPs proved strong efficiency in delivering and targeting the drug to reach the affected area with tumors.These results offer valuable insights into evaluating the effectiveness of PTT in addressing diverse cancer conditions and regulating their progression. 展开更多
关键词 Peristaltic flow Nanofluid AuNPs Magnetism Shape factor Gravity Heat transfer Porous medium
暂未订购 下载PDF
Velocity profiles description and shape factors inclusion in a hyperbolic,one-dimensional,transient two-fluid model for stratified and slug flow simulations in pipes 认领 引用
8
作者 Arianna Bonzanini Davide Picchi +1 位作者 Marco Ferrari Pietro Poesio 《Petroleum》 EI CSCD 2019年第2期191-198,共8页
In a previous work it has been shown that a one-dimensional,hyperbolic,transient five equations twofluid model is able to numerically describe stratified,wavy,and slug flow in horizontal and nearhorizontal pipes.Slug ... In a previous work it has been shown that a one-dimensional,hyperbolic,transient five equations twofluid model is able to numerically describe stratified,wavy,and slug flow in horizontal and nearhorizontal pipes.Slug statistical characteristics can be numerically predicted with results in good agreement with experimental data and well-known empirical relations.In this model some approximated and simplified assumptions are adopted to describe shear stresses at wall and at phase interface.In this paper,we focus on the possibility to account for the cross sectional flow by inserting shape factors into the momentum balance equations of the aforementioned model.Velocity profiles are obtained by a pre-integrated model and they are computed at each time step and at each computational cell.Once that the velocity profiles are known,the obtained shape factors are inserted in the numerical resolution.In this way it is possible to recover part of the information lost due to the one-dimensional flow description.Velocity profiles computed in stratified conditions are compared against experimental profiles measured by PIV technique;a method to compute the velocity profile during slug initiation and growth has been developed and the computed velocity distribution in the liquid phase was compared against the one-seventh power law. 展开更多
关键词 Multi-phase pipeline transport Oil&gas Hyperbolic two-fluid model Velocity profiles Shape factors
暂未订购 下载PDF
Heat Transfer Analysis of Temperature-Sensitive Ternary Nanofluid in MHD and Porous Media Flow:Influence of Volume Fraction and Shape 认领 引用
9
作者 Barkilean Jaismitha Jagadeesan Sasikumar +2 位作者 Samad Noeiaghdam Unai Fernandez-Gamiz Thirugnanasambandam Arunkumar 《Frontiers in Heat and Mass Transfer》 EI CAS 2025年第5期1529-1554,共26页
The present study investigates the dynamic behavior of a ternary-hybrid nanofluid within a tapered asymmetric channel,focusing on the impact of unsteady oscillatory flow under the influence of a magnetic field.This st... The present study investigates the dynamic behavior of a ternary-hybrid nanofluid within a tapered asymmetric channel,focusing on the impact of unsteady oscillatory flow under the influence of a magnetic field.This study addresses temperature-sensitive water transport mechanisms relevant to industrial applications such as thermal management and energy-efficient fluid transport.By suspending nanoparticles of diverse shapes-platelets,blades,and spheres in a hybrid base fluid comprising cobalt ferrite,magnesium oxide,and graphene oxide,the study examines the influence of both small and large volume fraction values.The governing equations are converted into a dimensionless form.With suitable assumptions,the partial differential equations(PDEs)are simplified into ordinary differential equations(ODEs),which are then solved using an analyticalmethod.Theproposed solution is verified using a numerical approach with the BVP4C solver.The analysis yields detailed graphs that depict the behavior of key fluid flow parameters,such as velocity,temperature,concentration,skin friction,Nusselt number,and Sherwood number,within the tapered asymmetric channel. 展开更多
关键词 Heat transfer shape factor ternary nanofluid flow temperature-dependent linear slope regression
暂未订购 下载PDF
Factors Affecting Transformation Temperatures in Fe-Mn-Si-Cr-Ni Shape Memory Alloy 认领 引用 被引量：2
10
作者 Yuhua WEN+, ding LI and Mingjing TU 《Journal of Materials Science & Technology》 SCIE EI CAS 2000年第5期537-539,共3页
The effects of prestrain and annealing temperature on phase transformation temperatures in Fel4Mn5Si8Cr4Ni shape memory alloy have been studied. The results showed that when the annealing temperature was 673 K, both t... The effects of prestrain and annealing temperature on phase transformation temperatures in Fel4Mn5Si8Cr4Ni shape memory alloy have been studied. The results showed that when the annealing temperature was 673 K, both the At and the Ms temperatures increased appreciably as the prestrain increased, the As temperature increased slightly with increasing prestrain; the resistivity difference at 303 K between the heating and cooling curve also increased with increasing prestrain, which agreed with the recovery strain. The shape memory effect in Fe-Mn-Si-Cr-Ni shape memory alloy is caused by the stress-induced γ→ε martensite transformation and its reverse transformation. When the prestrain was 10%, the Ms temperature decreased remarkably as the annealing temperature increased. 展开更多
关键词 Factors Affecting Transformation Temperatures in Fe-Mn-Si-Cr-Ni Shape Memory Alloy Fe Mn Cr Ni Si
暂未订购 下载PDF
Numerical investigation of the influence of kinetics and shape factor on barium sulfate precipitation in a continuous stirred tank 认领 引用
11
作者 Zheng WANG Zai-Sha MAO +2 位作者 Chao YANG Qinghua ZHANG Jingcai CHENG 《Frontiers of Chemical Science and Engineering》 2009年第3期272-281,共10页
The effect of kinetics and shape factor on barium sulfate precipitation in a continuous stirred tank has been investigated numerically through solving the standard momentum and mass transport equations in combination ... The effect of kinetics and shape factor on barium sulfate precipitation in a continuous stirred tank has been investigated numerically through solving the standard momentum and mass transport equations in combination with the moment equations for crystal population balance.The numerical method was validated with the literature data.The simulated results include the distribution of the local supersaturation ratio in the reactor,the mean crystal size,and the coefficient of variation.The simulation results show that the value of shape factor used in the model affected greatly the mean crystal size and the moments of the crystal size distribution.The influence of the kinetic expressions on the simulation is also analyzed.It is important to investigate the relationship of the shape factor with the precipitator type and other operation conditions to obtain reliable simulation results and suitable kinetic equations of crystal nucleation and growth rates. 展开更多
关键词 stirred tank numerical simulation precipita-tion shape factor crystal kinetics
暂未订购 下载PDF
Influence of Soft Filler on Stress Concentration Factor of Elliptic Holes in a Rectangular Plate 认领 引用 被引量：2
12
作者 杨林虎 朱涵 谭党联 《Transactions of Tianjin University》 EI CAS 2012年第2期117-120,共4页
Finite element models were established to analyze the influence of soft filler on stress concentration for a rectangular plate with an elliptic hole in the center. The influence was quantified by means of stress conce... Finite element models were established to analyze the influence of soft filler on stress concentration for a rectangular plate with an elliptic hole in the center. The influence was quantified by means of stress concentration factor (SCF). Seven shape factors of the elliptic hole and three levels of elasticity modulus of the soft filler were considered. The reduction coefficient and sensitivity index of SCF are the two indicators in evaluating the influence of soft filler. It was found that the reduction coefficient of SCF increases significantly as the shape factor and the elasticity modulus of the filler increase, indicating that soft filler can reduce the concentrated stress effectively, especially when the shape factor is great. Analysis for the sensitivity index of SCF indicates that SCF is more sensitive to materials with small elasticity modulus than to materials with large one. 展开更多
关键词 stress concentration factor elliptic hole soft filler shape factor elasticity modulus
暂未订购 下载PDF
7075铝合金等温处理制坯中保温温度对晶粒大小的影响及分析 认领 引用 被引量：1
13
作者 牛海侠 毛忠民 张琼 《西安文理学院学报（自然科学版）》 2026年第1期80-85,共6页
本研究探讨了高强度7075铝合金在半固态制坯过程中保温温度对晶粒演变的影响规律.通过实验测试与图像分析软件,系统地研究了不同保温温度下平均晶粒直径和平均形状因子的变化,并基于合并机制及Ostwald熟化理论进行了深入的机理分析.研... 本研究探讨了高强度7075铝合金在半固态制坯过程中保温温度对晶粒演变的影响规律.通过实验测试与图像分析软件,系统地研究了不同保温温度下平均晶粒直径和平均形状因子的变化,并基于合并机制及Ostwald熟化理论进行了深入的机理分析.研究结果表明:随着保温温度的升高,平均晶粒直径显著增大;同时,晶粒平均形状因子接近1,表现出近球形特征,显示出优异的触变性能. 展开更多
关键词 等温处理 保温温度 晶粒尺寸 平均形状因子
暂未订购 下载PDF
基于改进FPN和边缘监督的小目标语义分割 认领 引用
14
作者 曹江 赵文硕 +3 位作者 王大方 韩雨霖 赵逸飞 侯芹忠 《汽车工程》 EI CSCD 北大核心 2026年第4期754-763,共10页
在前视图场景下进行像素级别的语义分割,可获取各空间位置的语义信息,对于自动驾驶任务至关重要。但在语义分割过程中,小尺度目标由于自身像素占比较小、包含的RGB信息有限,提取的判别性特征不足,极易被忽略。针对上述问题,本文提出一... 在前视图场景下进行像素级别的语义分割,可获取各空间位置的语义信息,对于自动驾驶任务至关重要。但在语义分割过程中,小尺度目标由于自身像素占比较小、包含的RGB信息有限,提取的判别性特征不足,极易被忽略。针对上述问题,本文提出一种改进的针对小目标设计的语义分割技术,设计了扩展特征金字塔网络(FPN)以保留小目标物体的特征信息,并在不同层级之间引入特征融合因子,控制深层传递到浅层的信息;同时,设计了基于形状流的网络分支,对边界信息明显的小尺度目标施加针对性监督;此外,引入了通道-空间联合门控单元,对边缘特征和常规特征进行动态权重再分配。实验结果表明,与传统的语义分割模型估计方案相比,该模型的平均精度提升2.42百分点,针对远距离、小尺度目标的分割精度提升4.62百分点,有效解决了前视场景下远距离、小尺度目标的语义分割问题。 展开更多
关键词 语义分割 扩展FPN 融合因子 形状流监督
暂未订购 下载PDF
基于层次分析法和形状文法的如意云肩创新设计研究 认领 引用 被引量：1
15
作者 高兰英 刘一新 《设计》 2026年第4期10-14,共5页
为充分挖掘中国传统服饰构件如意云肩中所蕴含的文化资源,促进理论研究和创作实践的互鉴共进,本文提出基于如意云肩文化因子的创新设计方法,以期进一步开发传统服饰的当代应用潜势,活化其艺术与文化价值。首先收集图片文字资料,对如意... 为充分挖掘中国传统服饰构件如意云肩中所蕴含的文化资源,促进理论研究和创作实践的互鉴共进,本文提出基于如意云肩文化因子的创新设计方法,以期进一步开发传统服饰的当代应用潜势,活化其艺术与文化价值。首先收集图片文字资料,对如意云肩中的文化因子进行分类;其次利用层次分析法筛选出创新设计的合适思路;最后对图形元素进行重组与再设计,产出作品,探索切实可行的创新设计路径,拓展文化与设计的双向融合思路。 展开更多
关键词 如意云肩 层次分析法 形状文法 文化因子 创新设计
暂未订购 下载PDF
考虑流域形状系数的水文比拟法改进 认领 引用
16
作者 回晓莹 张育德 《水利水电工程设计》 2026年第1期72-75,共4页
水文比拟法是设计洪水计算的重要方法,但一些流域受形状、面积、降雨特性等因素的影响,导致区域内水文站设计洪峰与面积相关关系较差,无法拟合得到统一的面积比指数,从而影响水文比拟法的应用。以洛清江流域为研究对象,通过将流域形状... 水文比拟法是设计洪水计算的重要方法,但一些流域受形状、面积、降雨特性等因素的影响,导致区域内水文站设计洪峰与面积相关关系较差,无法拟合得到统一的面积比指数,从而影响水文比拟法的应用。以洛清江流域为研究对象,通过将流域形状系数加入到设计洪峰与面积的双对数关系中,使得各水文站设计洪峰流量与其面积的2/3次方相关性较好。由此,提出一种在参证站设计洪峰与面积相关关系较差的情形下,可以尝试使用考虑流域形状系数的水文比拟法,对于类似地区的设计洪水计算具有一定的参考意义与实用价值。 展开更多
关键词 流域形状系数 设计洪水 水文比拟法 洛清江流域
暂未订购 下载PDF
长江下游官洲水道河床演变特性及趋势 认领 引用
17
作者 徐华 王浩杰 +4 位作者 张帆一 张世钊 闻云呈 赵泽亚 阮俊生 《长江科学院院报》 CSCD 北大核心 2026年第4期18-26,共9页
长江下游官洲段是典型的鹅头型汊道河段,洲滩汊道及分流分沙格局复杂多变。根据官洲段1966—2023年实测资料,分析了该河段近期河床演变特性,并对其演变影响因素及发展趋势进行了探讨。研究表明:在一系列护岸工程约束下,官洲水道总体河... 长江下游官洲段是典型的鹅头型汊道河段,洲滩汊道及分流分沙格局复杂多变。根据官洲段1966—2023年实测资料,分析了该河段近期河床演变特性,并对其演变影响因素及发展趋势进行了探讨。研究表明:在一系列护岸工程约束下,官洲水道总体河势稳定,新中汊目前已不具备大幅发展的条件,东江主汊地位将持续相对稳固;新水沙条件下,清水下泄、短汊发展,清洁洲头部仍有一定程度冲淤调整,继而可能引起南夹江口门进流及分流的小幅变化;与此同时,汊道汇流段左岸边滩的冲刷将长期存在,对下游河势变化会产生一定影响。结合研究结果提出今后河势发展控制要点:加强对清洁洲头、复生洲左缘及汊道汇流段左岸等关键区域的监测与防护,可为河势稳定和滩槽控导等提供技术参考。 展开更多
关键词 河床演变 鹅头分汊河型 演变影响因素 发展趋势 官洲水道
暂未订购 下载PDF
考虑孔隙形状的页岩储层裂缝预测与流体识别方法研究 认领 引用
18
作者 薛冈 李彦婧 +5 位作者 关琳琳 孙斌 薛野 单中强 刘昊娟 曾勇坚 《海相油气地质》 CSCD 北大核心 2026年第1期97-108,共12页
裂缝发育特征与流体分布状态是评价页岩气勘探开发的关键因素,而孔隙形状对储层弹性及物性性质的影响常被现有方法忽略,导致预测精度受限。针对上述问题,以考虑孔隙形状影响为核心提出改进方法:首先,基于测井岩石物理参数交会分析,优选... 裂缝发育特征与流体分布状态是评价页岩气勘探开发的关键因素,而孔隙形状对储层弹性及物性性质的影响常被现有方法忽略,导致预测精度受限。针对上述问题,以考虑孔隙形状影响为核心提出改进方法:首先,基于测井岩石物理参数交会分析,优选出Gassmann流体项作为目标靶区含气页岩的流体识别因子;其次,将发育高角度裂缝的页岩储层近似为具有水平对称轴的横向各向同性(horizontal transverse isotropy,HTI)介质,结合岩石物理建模,推导建立了考虑孔隙形状影响的HTI介质各向异性反射系数方程。在此基础上,构建基于贝叶斯框架的两步叠前各向异性反演方法,实现流体识别因子及裂缝参数的直接反演。合成记录测试显示,该方法反演结果与模型值吻合度高且抗噪性强。黔北地区道真向斜五峰组—龙马溪组页岩气储层的实际工区测试结果表明,反演结果与测井解释一致性较高,能有效刻画高角度裂缝发育特征及含气页岩展布。研究成果为页岩储层裂缝预测与流体识别提供了新的理论与技术支撑。 展开更多
关键词 含气页岩 孔隙形状 裂缝参数 流体识别因子 各向异性地震反演
暂未订购 下载PDF
跨V型沟谷高路堤空间地形土拱特征分析 认领 引用
19
作者 阙云 朱啸辉 +2 位作者 姚晓琴 薛斌 谢秀栋 《工程地质学报》 CSCD 北大核心 2026年第3期1266-1279,共14页
为揭示V型沟谷下路堤的地形土拱特征,首先通过相似配比试验得到试验填土配合比,再结合室内缩尺模型试验与数值计算方法,分析V型沟谷下路堤地形土拱产生机理,以及地形因子和填土材料参数对土拱特征的影响规律。结果表明:沟谷在竖直方向... 为揭示V型沟谷下路堤的地形土拱特征,首先通过相似配比试验得到试验填土配合比,再结合室内缩尺模型试验与数值计算方法,分析V型沟谷下路堤地形土拱产生机理,以及地形因子和填土材料参数对土拱特征的影响规律。结果表明:沟谷在竖直方向上呈现V字形,导致路堤与侧岸产生竖向相对位移,侧岸或沟谷底部作为稳定拱脚形成空间应力拱。从坡脚到一级护坡道范围内由于上覆土层高度太小无土拱特征,往路堤内部逐渐增强,到后缘起坡位置最明显,且主要存在路堤底部0.23倍路堤高度范围内。路堤填土高度增大,土拱效应增强,成拱区域向后缘扩大,拱脚由路堤底部向侧岸转移,拱长与拱厚逐渐增加;沟底宽度在15 m以内、侧岸角度在50°~70°、内摩擦角小于30°以及沟谷地基与填料弹性模量比大时,对土拱效应影响明显;接触面摩擦系数和弹性模量,对土拱效应影响较小,属于次要因素;路堤边坡坡率与黏聚力对土拱效应影响很小。地形土拱相比于一般类型土拱,地形土拱的拱脚范围、拱长与拱厚更大、拱形随深度自下而上逐渐由马鞍形转变为扁平圆弧形。成果可为建立V型沟谷下路堤边坡稳定性设计算方法提供参考。 展开更多
关键词 V型沟谷 地形土拱 竖向拱 地形因子
暂未订购 下载PDF
基于形状因子修正的带活动导叶离心泵泥沙磨损模拟研究 认领 引用 被引量：2
20
作者 陆少鹏 高琳 +2 位作者 刘帅 陈门迪 樊红刚 《流体机械》 CSCD 北大核心 2026年第1期101-109,共9页
针对某大型输水工程中带活动导叶离心泵的泥沙磨损问题,建立一种基于欧拉-拉格朗日方法和形状因子修正Oka模型的数值预测方法,研究低浓度含沙条件下泵内流场特性与磨损规律。结果表明,含沙量不高于0.135 kg/m3时,泥沙对离心泵内部流... 针对某大型输水工程中带活动导叶离心泵的泥沙磨损问题,建立一种基于欧拉-拉格朗日方法和形状因子修正Oka模型的数值预测方法,研究低浓度含沙条件下泵内流场特性与磨损规律。结果表明,含沙量不高于0.135 kg/m3时,泥沙对离心泵内部流场影响度不超过5%;磨损主要集中于叶轮吸力面尾缘、前盖板交界处及活动导叶前缘,吸力面磨损强度平均约为压力面的8.3倍;含沙量主导线性调控磨损强度,而粒径则主导磨损分布形态:小颗粒导致吸力面尾缘严重磨损,大颗粒因惯性效应使磨损向压力面及后盖板迁移。研究可为带活动导叶离心泵的抗磨设计与安全运行提供理论依据。 展开更多
关键词 活动导叶 离心泵 形状因子 磨损特性 泥沙参数
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 54 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈