检索结果-南通市图书馆

Mass-transport Deposits of the Upper Cretaceous Qingshankou Formation, Songliao Terrestrial Basin, Northeast China: Depositional Characteristics, Recognition Criteria and External Geometry

引用

Acta Geologica Sinica(English Edition) 2014年第1期88卷 62-77页

作者： PAN Shuxin WEI Pingsheng WANG Tianqi LIU Caiyan CHEN Bintao LIANG Sujuan research Institute of Petroleum Exploration & development–Northwest

Extensive mass transport deposits（MTDs）, which form a significant component of the stratigraphic record in ancient and modern deep water systems, mostly distributed in the continental margin of ocean basins worldwide. To date, no large-scale MTDs have been found in Chinese terrestrial basins. Based on integrated analysis of the seismic, drilling, core and logging data, this article report MTDs have been found in Songliao terrestrial basin（SLTB）, Northeast China. During the depositional period of the Upper Cretaceous Qingshankou Formation, slope break of lacustrine basins was an ideal discharge place for gravity depositions. Regional sedimentary study of MTDs reveals that Cretaceous-age MTDs in SLTB were deposited in slope-break environments by slide, slump and debris flow, and MTDs were mixed with little turbidite simultaneously. Besides the massive aspect, key features of MTDs are the common presence of deformational structures or softsedimentary deformation, floating shale clasts, boudins, microfaults, distortion beddings, rotated sand debris. Detailed mapping of two three-dimensional（3-D） seismic surveys acquired in Yingtai（YT） and Haituozi（HTZ） areas reveals that MTDs are characterized by chaotic, mounded, and transparent seismic reflection. Growth fault, slope gully and geomorphology of the slope break greatly influenced the sedimentary process and external geometry of MTDs, and as a consequence, MTDs in SLTB exhibit classic fan-like geometry and some special（non-fan-like） external geometry. Furthermore, fanlike MTDs can be divided into three subcategories, including isolated fan, mother-son fan and stacked fan. Non-fan-like MTDs can be divided into two subcategories, strip-like MTDs and faulted-pit MTDs. A new sedimentary model has been built for MTDs in SLTB. MTDs have become a new exploration and development target in the SLTB.

关键词： MTDs depositional characteristics recognition criteria external geometry Songliao 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

Geological Conditions and Prospect Forecast of Shale Gas Formation in Qiangtang Basin, Qinghai-Tibet Plateau

引用

Acta Geologica Sinica(English Edition) 2014年第2期88卷 598-619页

作者： YU Yuanjiang ZOU Caineng DONG Dazhong WANG Shejiao LI Jianzhong YANG Hua LI Denghua LI Xinjing WANG Yuman HUANG Jinliang PetroChina research Institute of Petroleum Exploration and development

The presence of shale gas has been confirmed in almost every marine shale distribution area in North *** conditions of shale gas in China are the most favorable for marine,organic-rich shale as *** there has been little research focusing on shale gas in Qiangtang Basin,Qinghai-Tibet Plateau,where a lot of Mesozoic marine shale formations *** on the survey results of petroleum geology and comprehensive test analysis data for Qinghai-Tibet Plateau,for the first time,this paper discusses characteristics of sedimentary development,thickness distribution,geochemistry,reservoir and burial depth of organic-rich shale,and geological conditions for shale gas formation in Qiangtang *** are four sets of marine shale strata in Qiangtang Basin including Upper Triassic Xiaochaka Formation （T3x）,Middle Jurassic Buqu Formation （J2b）,Xiali Formation （J2x） and Upper Jurassic Suowa Formation （J3s）,the sedimentary types of which are mainly bathyal-basin facies,open platform-platform margin slope facies,lagoon and tidal-fiat facies,as well as delta *** comparing it with the indicators of gas shale in the main ***,it was found that the four marine shale formations in Qiangtang Basin constitute a multi-layer distribution of organic-rich shale,featuring a high degree of thickness and low abundance of organic matter,high thermal evolution maturity,many kinds of brittle minerals,an equivalent content of quartz and clay minerals,a high content of feldspar and low porosity,which provide basic conditions for an accumulation of shale gas *** Formation shale is widely distributed,with big thickness and the best gas generating *** is the main gas source *** Formation shale is of intermediate thickness and coverage area,with relatively good gas generating indicators and moderate gas formation *** Formation shale and Suowa Formation shale are of relatively large thickness,and covering a small area,with p

关键词： Shale gas marine shale geological characteristics geological conditions for gas formation resources prospect forecast Qiangtang 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

Parameters Affecting Energy Consumption for Producing High Carbon Ferromanganese in a Closed Submerged Arc Furnace

引用

Journal of Iron and Steel research International 2014年第7期21卷 666-672页

作者： Azza Ahmed Hossam Halfa Mohamed K.El-Fawakhry Hoda El-Faramawy Mamdouh Eissa Steel Technology Metallurgical Research and Development Institute

The power consumption is considered to be the most important factor affecting the production cost of fer romanganese alloy. Different parameters affecting the energy consumption for industrial production of high carbon ferromanganese HCFeMn were investigated in a closed submerged arc furnace. The analysis of industrial data revealed that the most energy consumed factors were the direct reduction by solid carbon, Boudouard reaction, metal and slag formation, and decomposition of fluxing materials （limestone and dolomite）. To reduce the energy con- sumption and minimize the energy losses in the production process of HCFeMn, it was recommended to use Mn blend with minimum Mn to Fe ratio of 6 and lower SiO2 content or higher basicity. The added coke must be adjusted according to the material balance to prevent the over-coke and to minimize the highly endothermic ＂Boudouard reac tion＂. In addition, it was recommended to work at basic slags with the ratio of （CaO＋MgO） to Si（）2 equal to 1.0- 1.2 instead of much higher slag basicity. Furthermore, the mass losses had to be minimized through adjusting the handling and charging process and to take care of all metal produced.

关键词： high carbon ferromanganese production energy consumption carbonate decomposition Boudouard reaction slag basicity energy loss

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

Multimodal Fused Deep Learning Networks for Domain Specific Image Similarity Search

引用

Computers, Materials & Continua 2023年第4期75卷 243-258页

作者： Umer Waqas Jesse Wiebe Visser Hana Choe Donghun Lee research and development AItheNutrigeneSeoul06132Korea

The exponential increase in data over the past fewyears,particularly in images,has led to more complex content since visual representation became the new norm.E-commerce and similar platforms maintain large image catalogues of their *** image databases,searching and retrieving similar images is still a challenge,even though several image retrieval techniques have been proposed over the *** of these techniques work well when querying general image ***,they often fail in domain-specific image databases,especially for datasets with low intraclass *** paper proposes a domain-specific image similarity search engine based on a fused deep learning *** network is comprised of an improved object localization module,a classification module to narrow down search options and finally a feature extraction and similarity calculation *** network features both an offline stage for indexing the dataset and an online stage for *** dataset used to evaluate the performance of the proposed network is a custom domain-specific dataset related to cosmetics packaging gathered from various online *** proposed method addresses the intraclass variance problem with more precise object localization and the introduction of top result reranking based on object ***,quantitative and qualitative experiment results are presented,showing improved image similarity search performance.

关键词： Image search classification image retrieval deep learning

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

Synthesis and Crystal Structure of a 3-Arylamino-3-Deoxy Sugar Derivative

引用

Chinese Journal of Structural Chemistry 2006年第12期25卷 1492-1496页

作者：姬小明孙贺平莫娟刘宏民 New Drug research & development Center Zhengzhou University

3-Deoxy-3-（p-fluorine-phenylamino）-1,2-O-isopropylidene-α-D-ribofuranose 3 was synthesized and characterized by IR, NMR and H R M S, and its crystal structure was detertnined by X-ray diffraction analysis. Crystal data for 3： monoclinic, space group P21, a=7.0403（14）, b = 6.7780（4）, c = 14.932（3） A, β= 94.74（3）°, C14H18FNO4, Mr = 283.29, V= 710.1（2） A^3, Z = 2, Dc = 1.325 g/cm^3, μ = 0.105 mm^-1, F（000） = 300, the final R = 0.0468 and wR = 0.0926 for 1969 observed reflections （I 〉 2σ（I））. Two intermolecular hydrogen bonds are observed. The absolute configuration of this molecule was confirmed by comparison with that of the original material.

关键词： synthesis crystal structure p-fluorine-phenylamino amino sugar

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

TRMT6 and TRMT61A facilitated acute pancreatitis severity via regulation of neutrophil function

引用

Science China Life Sciences 2025年

作者： Yuan Dong Li Su Sin Man Lam Cen Yan Yalan Deng Guotao Lu Jinkui Yang Guanghou Shui Yingmei Feng Beijing Institute of Hepatology Beijing Youan HospitalCapital Medical University Department of Science and development Beijing Youan HospitalCapital Medical University Laboratory for Clinical Medicine Capital Medical University Neuroscience research Institute Peking University Center of Medical and Health AnalysisPeking University State Key Laboratory of Molecular developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of Sciences Pancreatic Center Department of GastroenterologyAffiliated Hospital of Yangzhou UniversityYangzhou University Beijing Key Laboratory of Diabetes research and Care Department of EndocrinologyBeijing Tongren HospitalCapital Medical University

Dear Editor,Type 2 diabetes mellitus (T2DM) has been identified as a risk factor for increased severity in acute pancreatitis (AP)(Mikóet al,2018).However,to date,no studies have simultaneously included healthy individuals,T2DM patients,and AP patients to investigate which diabetes-associated metabolites are linked to AP severity.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Flow field control for 2-meter high-speed free-jet wind tunnel

引用

Chinese Journal of Aeronautics 2023年第10期36卷 77-89页

作者： Jiayi TIAN Zhongwei LING Weijie LIU Jianhua Qin Neng XIONG China Aerodynamics research and development Center Mianyang 621000China

The 2-meter High-speed Free-jet Wind Tunnel(2 m HFWT)is China’s first large-scale open-jet trisonic wind *** to traditional closed high-speed wind tunnels,this wind tunnel is endowed with remarkable advantages of ample test chamber space,less interference from the tunnel wall,flexible model support mode,and adjustable continuous variation of the Mach ***,its unique structure makes traditional wind tunnel control methods difficult to apply and brings significant challenges to wind tunnel flow field *** this paper,a flow field control system is designed for the 2 m HFWT by comprehensively using advanced control technologies such as neural network,gain scheduling,feedforward control,and adaptive *** practical application tests,it is proved that the proposed control system successfully solves the problem of high-precision flow field control under continual depletion of storage tank pressure,and realizes distinctive functions of adaptive static pressure matching and continuously varying Mach number at supersonic *** addition,due to the application of workflow technology,the flow field control system can flexibly adapt to the implementation of tests of different types and operation conditions,thus fully satisfying the needs of conducting various conventional and special tests in the 2 m HFWT.

关键词： Continuously varying Mach number Wind tunnel Flow field control Neural network Static pressure matching Feedforward control

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

Calibration of a γ-Re_θ transition model and its validation in low-speed flows with high-order numerical method

引用

Chinese Journal of Aeronautics 2015年第3期28卷 704-711页

作者： Wang Yuntao Zhang Yulun Li Song Meng Dehong Computational Aerodynamics Institute China Aerodynamics Research and Development Center

Abstract Based on the Reynolds-averaged Navier--Stokes （RANS） equations and structured grid technology, the calibration and validation of Y-Reo transition model is preformed with fifth-order weighted compact nonlinear scheme （WCNS）, and the purpose of the present work is to improve the numerical accuracy for aerodynamic characteristics simulation of low-speed flow with transition model on the basis of high-order numerical method study. Firstly, the empirical correlation functions involved in the Y-Reo transition model are modified and calibrated with experimental data of turbulent flat plates. Then, the grid convergence is studied on NLR-7301 two-element airfoil with the modified empirical correlation. At last, the modified empirical correlation is validated with NLR-7301 two-element airfoil and high-lift trapezoidal wing from transition location, velocity pro- file in boundary layer, surface pressure coefficient and aerodynamic characteristics. The numerical results illustrate that the numerical accuracy of transition length and skin friction behind transition location are improved with modified empirical correlation function, and obviously increases the numerical accuracy of aerodynamic characteristics prediction for typical transport configurations in low-speed range.

关键词： Aerodynamic characteristicsFinite difference scheme High-order method Laminar to turbulenttransition RANS

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

Evaluating the impact of auxiliary fan practices on localised subsurface ventilation

引用

International Journal of Mining Science and Technology 2019年第6期29卷 933-941页

作者： David J.de Villiers Marc J.Mathews Philip Maré Marius Kleingeld Deon Arndt Centre for research and Continued Engineering development North-West University

Mines are continually expanding in size and depth,leading to an increased reliance on localised subsurface ventilation *** use of underground auxiliary fans is a favoured method to increase and control airflow in working ***,the effectiveness of auxiliary fans in this regard is not *** paper evaluated the performance of these underground fan systems in four different South African deeplevel gold mines.A total auxiliary fan system efficiency of 5%was found across six systems,with the average fan efficiency of 33 fans at 38%.The results showed that these fans deviate significantly from their design operating ***,there are significant shortcomings in current underground fan *** detailed investigations led to the conclusion that the assemblage of underground auxiliary fan systems results in significant energy ***,maintaining good underground fan practice such as optimal fan selection,ducting design and maintenance is crucial for the efficacy of a mine ventilation network.

关键词： Mine ventilation Underground fan assemblage Fan system performance

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

Flash X-ray radiography technique to study the high velocity impact of soft projectile on E-glass/epoxy composite material

引用

Defence Technology（防务技术） 2019年第2期15卷 216-226页

作者： B.Venkata Ramudu C.Jayarami Reddy V.Madhu Armour Design and development Division Defence Metallurgical Research Laboratory

In the present paper, the high velocity impact of 9 mm soft lead projectile on 10 mm and 30 mm thick Eglass/epoxy composites was studied using a 450 kV Flash X-ray radiography(FXR) system. The basic parameters of FXR imaging, such as effect of ratio of target to film(TF) and source to target(ST) distances and X-ray penetration thickness of the composite material were optimized based on clarity and the actual dimensions of the objects. The optimized parameters were used in the FXR imaging of the ballistic event of 9 mm soft projectile on E-glass/epoxy composite. The real time deformation patterns of both the projectile and composite target during the ballistic impact were captured and studied at different time intervals. The notable failure modes of the 10 mm thick target with time include fibre breakage, bulging on the back side, delamination, recovery of the bulging, reverse bulging and its recovery. However, with increase in thickness of the target to 30 mm the only failure mechanism observed is the breaking of fibres. The ballistic impact event was also numerically simulated using commercially available LS-DYNA software. The numerically simulated deformation patterns of the projectile and target at different time intervals are closely matching with the corresponding radiographic images.

关键词： Flash X-ray radiography E-Glass/epoxy composite Ballistic impact Numerical simulation

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

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：