检索结果-南通市图书馆

Shape factor for regular and irregular matrix blocks in fractured porous media

Petroleum Science 2020年第1期17卷 136-152页

作者： Peyman Rostami Mohammad Sharifi Morteza Dejam Department of Petroleum Engineering Amirkabir University of Technology(Polytechnic of Tehran)Hafez AvenueP.O.Box 15875-4413TehranIran Department of Petroleum Engineering College of Engineering and Applied ScienceUniversity of Wyoming1000 E.University AvenueLaramieWY 82071-2000USA

Describing matrix–fracture interaction is one of the most important factors for modeling natural fractured reservoirs.A common approach for simulation of naturally fractured reservoirs is dual-porosity modeling where the degree of communication between the low-permeability medium(matrix)and high-permeability medium(fracture)is usually determined by a transfer *** of the proposed matrix–fracture functions depend on the geometry of the matrix and fractures that are lumped to a factor called shape ***,there is no unique solution for calculating the shape factor even for symmetric *** fine-scale modeling is a tool for calculating the shape factor and validating the current solutions in the *** this study,the shape factor is calculated based on the numerical simulation of fine-grid simulations for single-phase flow using finite element *** the best of the author’s knowledge,this is the first study to calculate the shape factors for multidimensional irregular bodies in a systematic *** models were used,and shape factors were calculated for both transient and pseudo-steady-state(PSS)cases,although in some cases they were not clarified and assumptions were not *** boundary condition dependency of the shape factor was also investigated,and the obtained results were compared with the results of other *** show that some of the most popular formulas cannot capture the exact physics of matrix–fracture *** obtained results also show that both PSS and transient approaches for describing matrix–fracture transfer lead to constant shape factors that are not unique and depend on the fracture pressure(boundary condition)and how it changes with time.

关键词： Fractured reservoirs Shape factor Matrix–fracture boundary conditions Computational fluid dynamic(CFD)

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

Application of percarbonate and peroxymonocarbonate in decontamination technologies

引用

Journal of Environmental Sciences 2021年第7期33卷 100-115页

作者： Bo-Tao Zhang Lulu Kuang Yanguo Teng Maohong Fan Yan Ma College of Water Sciences Beijing Normal UniversityBeijing 100875China Engineering Research Center of Groundwater Pollution Control and Remediation Ministry of EducationBeijing 100875China Department of Chemical and Petroleum Engineering University of WyomingLaramieWY 82071United States School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Sodium percarbonate(SPC)and peroxymonocarbonate(PMC)have been widely used in modified Fenton reactions because of their multiple superior features,such as a wide pH range and environmental *** broad review is intended to provide the fundamental information,status and progress of SPC and PMC based decontamination technologies according to the peer-reviewed papers in the last two *** SPC and PMC can directly decompose various *** degradation efficiency will be enhanced and the target contaminants will be expanded after the activation of SPC and *** most commonly used catalysts for SPC activation are iron compounds while cobalt composi-tions are applied to activate PMC in homogenous and heterogeneous catalytical *** generation and participation of hydroxyl,superoxide and/or carbonate radicals are involved in the activated SPC and PMC *** reductive radicals,such as carbon dioxide and hydroxyethyl radicals,can be generated when formic acid or methanol is added in the Fe(II)/SPC system,which can reduce target *** can also be activated by energy,tetraacetylethylenediamine,ozone and buffered alkaline to generate different reactive radicals for pollutant *** SPC and activated SPC have been assessed for application in-situ chemical oxidation and sludge dewatering *** challenges and prospects of SPC and PMC based decontamination technologies are also addressed in the last section.

关键词： Sodium percarbonate Peroxymonocarbonate Activation Radical Decontamination technologies

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

A Climatic Sequence Stratigraphic Model in the Terrestrial Lacustrine Basin:A Case Study of Green River Formation,Uinta Basin,USA

引用

Acta Geologica Sinica(English Edition) 2009年第1期83卷 130-135页

作者： WANG Junling ZHENG Herong XIAO Huanqin ZHONG Guohong Ronald STEEL YIN Peigui Petroleum Exploration and Production Institute SINOPEC Beijing 10083 China Institute ofGeoscience Shengli Oilfield Company Limited SINOPEC Beijing 10083 China Geology Department University of Texas Austin Texas USA Energy Research Institute University of Wyoming Laramie WY82071 USA

In recent years, with the development of terrestrial sequence stratigraphy, more attention has been focused on the study of the terrestrial lacustrine sequence stratigraphic model globally. Different viewpoints are preferred by researchers. Under the guidance of the theory of sequence stratigraphy, the findings of this paper indicate that climate is a major factor controlling the formation of the fourth-order sequence, based upon the study of the sequence stratigraphy in the Green River Formation of the Uinta basin in the USA. It also divides the fourth-order sequence in the terrestrial lacustrine basin into two system tracts： the wet （rising） half-cycle and the dry （falling） half- cycle, establishing a new-style fourth-order sequence stratigraphic model for the terrestrial lacustrine basin, that is, the climate-genetic sequence stratigraphic model. As a result, the theory of sequence stratigraphy is greatly enriched.

关键词： climate fourth-order sequence sequence stratigraphic model terrestrial lacustrine basin,Green River Formation Uinta basin

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

Impact of combined alignments and adverse weather conditions on vehicle skidding

引用

Journal of Traffic and Transportation Engineering(English Edition) 2023年第1期10卷 116-131页

作者： Anas Alrejjal Khaled Ksaibati Department of Civil and Architectural Engineering University of WyomingLaramieWY 82070USA

Roadways in wyoming are characterized by challenging horizontal profiles,vertical profiles,a combination of the two and adverse weather conditions,all of which affect vehicle *** this study,we investigated the impact of different operating speeds when negotiating combined horizontal and vertical curves under unfavorable environmental conditions on wyoming’s interstates via vehicle dynamics simulation *** simulation tools provided the acting forces on each tire of the vehicle and the side friction(skidding)*** allowed for examining the interaction between vehicle dynamics and road geometry in such ***,linear regression analysis was implemented to investigate the skidding margins based on the simulation results to demonstrate when a vehicle is more likely to deviate from its desired ***,this examines the contributing factors that significantly influence the skidding *** results indicated that:1)the skidding margins are dramatically decreased by adverse weather conditions even with lower degree of curvature and gradient values of combined curves and more particularly at higher operating speeds *** the vehicle speed on the curve by 10%,the skidding margin dropped by 15%.2)Compared to heavy trucks and sports utility vehicles(SUVs),passenger cars require the highest side friction demand.3)The effect of applying brakes on vehicle stability depends on the road surface condition;applying the brakes on snowy road surfaces increases the potential of vehicle skidding especially for heavy *** study assessed the curve speed limits and showed how important to assign safe and appropriate limits speed since the skidding likelihood is significantly sensitive to the vehicle *** study is beneficial to wyoming’s roadway agencies since hazardous sections having combined horizontal and vertical curves are ***,critical situations that require additional attention from law enforc

关键词： Vehicle dynamics simulations Combined horizontal and vertical curves Skidding margins Operating speed Adverse weather Brakes application

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

Spectral principal component analysis of the Hβ region of low-redshift SDSS quasars

引用

Research in Astronomy and Astrophysics 2019年第12期19卷 169-178页

作者： Bin Ma Zhaohui Shang Michael S.Brotherton National Astronomical Observatories Chinese Academy of Sciences.Beijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China Tianjin Astrophysics Center Tianjin Normal UniversityTianjin 300387China Department of Physics and Astronomy University of WyomingLaramieWY 82071.USA

Studying the relationships among quasar spectral features is essential to unveil the origins of the emission lines and the quasars’ physical processes. Principal component analysis(PCA) is a powerful tool to investigate correlations between variables. Here, we present the results of PCA on the spectra of low-redshift SDSS quasars. The rest-frame wavelength range studied is 4000 – 5500 ?, involving some typical features of quasar spectra, such as Hβ, [O Ⅲ] and Fe Ⅱ emission lines. The first principal component is the anti-correlation between [O Ⅲ] and Fe Ⅱ, the well-known eigenvector one(EV1). The next six principal components also show clear(anti-)correlations between line strengths and/or velocity widths of various features, which agree well with measured spectral properties. By comparing the weights of these principal components with other quasar properties, we can identify their underlying drivers. We find that the second principal component represents spectral slope, and can quantify quasar host fraction, intrinsic slope and reddening well. The third component exhibits the velocity width variation of Hβ, and may be a proxy for orientation. In addition, we calculate the fractional-contribution spectra to investigate which components dominate the variance at individual wavelength ranges. Our results also indicate that the optical Fe Ⅱ emission may have distinct origins.

关键词： quasars:emission lines quasars:general

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

Ultrasonic prediction of crack density using machine learning:A numerical investigation

引用

Geoscience Frontiers 2022年第1期13卷 114-126页

作者： Sadegh Karimpouli Pejman Tahmasebi Erik HSaenger Mining Engineering Group Faculty of EngineeringUniversity of ZanjanZanjanIran Department of Petroleum Engineering University of WyomingLaramieWY 82071USA Bochum University of Applied Sciences 44801 BochumGermany Fraunhofer IEG Fraunhofer Research Institution for Energy Infrastructure and Geothermal Systems44801 BochumGermany Ruhr-University Bochum 44801 BochumGermany

Cracks are accounted as the most destructive discontinuity in rock, soil, and concrete. Enhancing our knowledge from their properties such as crack distribution, density, and/or aspect ratio is crucial in geo-systems. The most well-known mechanical parameter for such an evaluation is wave velocity through which one can qualitatively or quantitatively characterize the porous media. In small scales, such information is obtained using the ultrasonic pulse velocity(UPV) technique as a non-destructive test. In large-scale geo-systems, however, it is inverted from seismic data. In this paper, we take advantage of the recent advancements in machine learning(ML) for analyzing wave signals and predict rock properties such as crack density(CD) – the number of cracks per unit volume. To this end, we designed numerical models with different CDs and, using the rotated staggered finite-difference grid(RSG) technique, simulated wave propagation. Two ML networks, namely Convolutional Neural Networks(CNN) and Long Short-Term Memory(LSTM), are then used to predict CD values. Results show that, by selecting an optimum value for wavelength to crack length ratio, the accuracy of predictions of test data can reach R2> 96% with mean square error(MSE) < 25e-4(normalized values). Overall, we found that:(i) performance of both CNN and LSTM is highly promising,(ii) accuracy of the transmitted signals is slightly higher than the reflected signals,(iii) accuracy of 2D signals is marginally higher than 1D signals,(iv)accuracy of horizontal and vertical component signals are comparable,(v) accuracy of coda signals is less when the whole signals are used. Our results, thus, reveal that the ML methods can provide rapid solutions and estimations for crack density, without the necessity of further modeling.

关键词： Machine learning Crack density Ultrasonic wave Numerical computation

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

A Two-Step GRIN Lens Coating for In Vivo Brain Imaging

引用

Neuroscience Bulletin 2019年第3期35卷 419-424页

作者： Yupeng Yang Lifeng Zhang Zhenni Wang Bo Liang Giovanni Barbera Casey Moffitt Yun Li Da-Ting Lin Hefei National Laboratory for Physical Sciences at the Microscale School of Life SciencesUniversity of Science and Technology of ChinaHefei 230027China Intramural Research Program National Institute on Drug AbuseNational Institutes of HealthBaltimoreMD 21224USA Department of Zoology and Physiology University of Wyoming College of Arts and SciencesLaramieWY 82071USA

The complex spatial and temporal organization of neural activity in the brain is important for informationprocessing that guides behavior. Hence, revealing the realtime neural dynamics in freely-moving animals is fundamental to elucidating brain function. Miniature fluorescence microscopes have been developed to fulfil this requirement. With the help of GRadient INdex(GRIN)lenses that relay optical images from deep brain regions to the surface, investigators can visualize neural activity during behavioral tasks in freely-moving animals. However, the application of GRIN lenses to deep brain imaging is severely limited by their availability. Here, we describe a protocol for GRIN lens coating that ensures successful long-term intravital imaging with commercially-available GRIN lenses.

关键词： Grin lens Coating Toxic Neurodegeneration

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

Visible-light-induced photocatalytic CO_(2)reduction over zirconium metal organic frameworks modified with different functional groups

引用

Journal of Environmental Sciences 2023年第10期132卷 22-30页

作者： Yuexian Du Guang’an Jie Huilin Jia Jiahui Liu Jieyu Wu Yanghe Fu Fumin Zhang Weidong Zhu Maohong Fan Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China Zhejiang Engineering Laboratory for Green Syntheses and Applications of Fluorine-Containing Specialty Chemicals Institute of Advanced Fluorine-Containing MaterialsZhejiang Normal UniversityJinhua 321004China Department of Chemical and Petroleum Engineering University of WyomingLaramieWY 82071USA

The reduction of CO_(2)into high value-added chemicals and fuels by a photocatalytic technology can relieve energy shortages and the environmental problems caused by greenhouse *** the current work,an amino-functionalized zirconium metal organic framework(Zr-MOF)was covalently modified with different functional groups via the condensation of Zr-MOF with 2-pyridinecarboxaldehyde(PA),salicylaldehyde(SA),benzaldehyde(BA),and trifluoroacetic acid(TA),named Zr-MOF-X(X=PA,SA,BA,and TA),respectively,through the post-synthesis *** with Zr-MOF and Zr-MOF-TA,the introduction of PA,SA,or BA into the framework of Zr-MOF can not only enhance the visible-light harvesting and CO_(2)capture,but also accelerate the photogenerated charge separation and transfer,thereby improving the photocatalytic ability of Zr-MOF for CO_(2)*** results indicate that the modification of Zr-MOF with electron-donating groups can promote the photocatalytic CO_(2)***,the current work provides an instructive approach to improve the photocatalytic efficiency of CO_(2)reduction through the covalent modification of MOFs.

关键词： Photocatalysis CO_(2)reduction Metal organic frameworks Post-synthesis modification Electric effect

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

Surface coal mine permit application for successful reclamation, semi-arid shortgrass prairie （wyoming, USA）

引用

International Journal of Coal Science & Technology 2018年第1期5卷 8-17页

作者： Anna Krzyszowska Waitkus Environmental Consulting 80 Eagle Nest LaramieWY 82070 USA

Approximately 40% of USA coal originates in an ecologically sensitive area of semi-arid shortgrass prairie in wyoming. Before a surface coal mine can begin operation in the USA, it must secure a mining permit and comply with regulations and performance standards under the USA Surface Mining Control and Reclamation Act （SMCRA）, other federal environmental acts, and state programs. The wyoming Department of Environmental Quality （WDEQ）/Land Quality Division （LQD） administers wyoming＇s coal regulatory program. The permit application and bonding process for the largest surface coal mine permit in the USA, North Antelope Rochelle Mine （NARM） located in short grassland prairie in the northeast wyoming, is discussed. The permit application process begins with the collection of baseline environ- mental data that characterizes premining conditions of the permit area. The permit application includes adjudication information, baseline information, mine and operation plans, and reclamation plans. Fulfillment of permit commitments and requirements of rules and regulations are inspected monthly by the LQD＇ s representative in the field. Before a mine permit is issued, the mine operator must submit a reclamation bond to secure the performance of reclamation obligations that is later revised annually. In wyoming, four reclamation bond release phases indicate the completion of various stages of the reclamatikon process. NARM＇s specific bond release verification cirteria, performance standards, and field verificatoins of bond release phases are discussed. The Bond Release Geodatabase （a GIS/GPS approach） was developed for this mine to monitor progress in meeting criteria and performance standards for incremental bond release. The Bond Release Geodatabase significantly reduces the time needed to track bond release progress, reach agreement between operator and regulator, and improve the state inspector＇s ability to assess reclamation adequacy and progress.

关键词： Surface coal mine permitting Bonding Reclamation GIS/GPS geodatabase USA rules and regulations Inspections

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

Signaling Pathways in the Ischemic Hearts

引用

中国药理通讯 2008年第2期25卷 22-24页

作者： Ji Li Department of Pharmaceutical Sciences ＆ Center for Cardiovascular Research and Alternative Medicine University of Wyoming School of Pharmacy Laramie WY 82071

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：