检索结果-南通市图书馆

Late Jurassic to early Cretaceous magnetostratigraphy of scientific drilling core LK-1 in the Lingshan Island of Riqingwei Basin,eastern China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2022年第4期65卷 742-758页

作者： Yanjun CHENG zhiping wu Xiaoyu LIU Yaoqi ZHOU Yining DAI Tongjie ZHANG Tengfei ZHOU College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Geosciences China University of Petroleum(East China)Qingdao 266580China

The Sulu orogenic belt is an uplift zone that was formed in the Late *** Jurassic to Cretaceous sedimentary successions have been recognized within the Sulu orogenic belt in recent studies,including outcrops that are considered to be related to the newly discovered Riqingwei *** basin has been the focus of extensive study due to its continuous Cretaceous rock sequence,geological location and petroleum resource ***,the lack of a consolidated chronology for the strata has precluded a better understanding of stratigraphy,tectonic evolution and resource potential of the Riqingwei ***,we present the results of a new magnetostratigraphic study of the continental scientific drilling borehole LK-1,which is located on Lingshan Island,offshore Shandong province,eastern *** goals of this study are to(1)refine the Late Jurassic to Early Cretaceous chronostratigraphic framework of the Riqingwei Basin,and(2)investigate the location of the J/K boundary in the Borehole Core *** observed patterns of the paleomagnetic polarity zone in the LK-1 borehole correlate well with the geomagnetic polarity time scale(GPTS),and the continuous magnetostratigraphy profile defined in this core indicates an age ranging from 146.5 to 125.8 Ma for the samples *** sediment accumulation rates(SAR)of LK-1 show one period of high SAR(~10.5 cm kyr^(-1))at 135.3–130.6 Ma and two periods of low SAR(~4.8 and~2.2 cm kyr^(-1))at145.7–135.3 and 130.6–125.8 Ma,*** addition,the magnetostratigraphic results suggest that the Jurassic-Cretaceous(J/K)boundary of the LK-1 is located within the magnetozone N21.2 n(~1254 m).This comprehensive geochronologic framework provides a good correlation of the marine Upper Jurassic to Lower Cretaceous strata in the Riqingwei Basin to other marine strata and continental sequences,in addition to providing a foundation for the study of the structural evolution of eastern China.

关键词： Magnetostratigraphy Continental Scientific Drilling borehole LK-1 J/K boundary Late Jurassic to Early Cretaceous Riqingwei Basin

Preparation and Superconducting Properties of F-doped SmO_(1-x)F_xFeAs

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第3期27卷 227-232页

作者： Zhiyong Liu Hongli Suo Lin Ma Min Liu zhiping wu Zhichao Guo Luping Han Meiling Zhou Key Laboratory of Advanced Functional Materials Ministry of Education College of Materials Science and Engineering Beijing University of Technology Beijing 100022 China

Here we report the fabrication and superconductivity of the iron-based arsenic oxide SmO1-xFxFeAs compound. X-ray diffraction （XRD） results prove that the lattice parameters a and c decrease systematically with increasing x in between 0〈x≤0.35, but when x〉0.35 the a and c increase with the decrease of x in the SmO1-xFxFeAs. The critical temperature （To） increases with increasing x in between 0.15≤x≤0.3, while x〉0.3 the Tc decreases with the increase ofx. It is found that at x=0.3 SmO0.7F0.3FeAs has the highest onset resistivity transition temperature of 55.5 K. The critical current density （Jc） value at 10 K for the obtained ***0.3FeAs is 1.3×10^5 A/cm^2 （0 T）. Meanwhile one can estimates Hc2（0） from the slope of the Hc2（T） curve at T=-Tc （Hc2 is the upper critical field）, and for the 90% normal-state resistivity （Pn） criterion （Tc=55 K）, Hc2（0） is determined to be -253 T.

关键词： SmO1-xFxFeAs compound F-doped Superconductivity

Development characteristics of the fault system and its control on basin structure, Bodong Sag, East China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2013年第4期10卷 450-457页

作者： wu zhiping Cheng Yanjun Yan Shiyong Su Wen Wang Xin Xu Changgui Zhou Xinhuai China University of Petroleum Tianjin Technical Department CNOOC

The Bodong Sag,located in the Bohai Sea,offshore China,is one of the most petroliferous basins in *** on three dimensional seismic reflection data and time slice data,we analyze the fault system of the Bodong area in detail,establish the fault structure pattern of different types and summarize the distribution of the fault *** is concluded that the development characteristics of the Cenozoic fault system are in accordance with the dextral stress field of the Tanlu Fault,which displayed a brush structure with NNE strike-slip faults as its principal faults,NE-trending extensional faults as secondary faults and EW-trending faults as minor *** can be divided into （1） strike-slip type,（2） extensional type,（3） strike-slip extensional type and （4） extensional strike-slip *** spatial structures of different faults have obvious differences because of the fault properties and activity *** fault system at different stages shows tremendous differences because of the transition of the Tanlu Fault from sinistral strike-slip to dextral strike-slip,the transition between extension and strike-slip,and the transition from mantle upwelling to thermal *** to the controlling effect of faults on basin structure,the Cenozoic basin experienced four evolutionary stages,（a） transition stage from sinistral strike-slip to dextral strike-slip,（b） strike-slip extensional faulted stage,（c） extensional strike-slip faulted stage and （d） strike-slip depression *** identification of temporal and spatial differences of faults could be used as a significant guideline for oil and gas exploration in the Bodong area.

关键词： Fault system basin structure Bodong area

BP neural network model for material distribution prediction based on variable amplitude anti-blocking screening DEM simulations

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2023年第4期16卷 190-199页

作者： Zheng Ma Yongle Zhu zhiping wu Souleymane Nfamoussa Traore Du Chen Licheng Xing School of Agricultural Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education&Jiangsu ProvinceJiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory for Theory and Technology of Intelligent Agricultural Machinery and Equipment Jiangsu UniversityZhenjiang 212013JiangsuChina College of Engineering China Agricultural UniversityBeijing 100083China Jiangsu World Agricultural Machinery Co. Ltd.Picheng Industrial ParkDanyang 212311JiangsuChina

The material feeding changing of combine harvester is easy to cause accumulation and blockage of the vibrating screen,which seriously affects the harvest *** order to alleviate such accumulation and blockages on the vibrating screen surface,the guide chute rotation angle of the improved variable amplitude screening mechanism was selected as the target variable,and EDEM-RecurDyn was employed to simulate the anti-blocking process of the variable amplitude under a changing feeding quantity(0.5 kg/s abnormal,0.2 kg/s normal)of materials(rice grain and stem mixture).A BP(an error back propagation algorithm)neural network was designed and the prediction model of the material distribution was subsequently constructed on the variable screening surface under different chute angles during abnormal *** results revealed a continuous decrease in the quality and time of the material blockage at the front end of the screen surface with the increasing guide chute *** the guide chute angle of 20°-45°and adjustment time of 3-6 s,the blocked and accumulated materials at the front-end screen surface was be moved back to Grid 6 for ***,overtime,the screen surface materials continued to move back under the chute angle of 40°-45°,which had a great impact on the screening *** the guide chute angle of 30°-35°and adjustment time of 4 s,the materials on the screen surface were evenly distributed in Grid *** was able to alleviate the accumulation and blockage of the screen surface *** R of the material distribution prediction model(BP neural network)on the screen surface was determined as 0.97,indicating the high reliability and accuracy of the material distribution model on the screen surface based on the BP neural *** work provides an important reference for the variable amplitude intelligent control of screen surface material anti-blocking.

关键词： variable amplitude material distribution EDEM-RecurDyn BP neural network

Economic Benefit Analysis of Carbon Sequestration of Five Typical Forest Types in BeijingMiyun Watershed

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

Chinese Forestry Science and Technology 2007年第1期6卷 57-61页

作者： XIAO Jianmin wu zhiping Research Institute of Forestry Policy and Information Chinese Academy of Forestry Beijing 100091. P. R. China Research Institute of Forestry Chinese Academy of Forestry Beijing 100091 P. R. China

This study provides basis information for estimating the feasibility of the environmental and ecological forestry construction project in the area. Through the survey in Miyun watershed, the economical benefits of carbon sequestration in five typical forest types have been studied by calculating the biomass from the timber accumulation data and converting to the money value. The results show that: in the duration of 100 years, at a discount rate of 5%, and 197 RMB yuan/t as the price of the carbon sequestration, the present value (PV) of the carbon sequestration in different forests are: 6900-9300 yuan/ha in Chinese pine forest,6100-8200 yuan/ha in oak forest, 4500-6100 yuan/ha in other broadleaf forests, 2300-3200 yuan/ha in shrubs and 1300-1800 yuan/ha in cypress forest. The annual mean economic benefit of carbon sequestration is 770-1040 yuan/ha. The pine forest has the highest carbon sequestration benefit, followed by oak forest, other broadleaf forest, shrubs, and cypress forest. If the land is suitable for all forests, pine forest and oak forest should be planted in order to sequestrate more carbon.

关键词： carbon sequestration economic benefits Miyun watershed

SEDIMENTARY PATTERN OF PROTOTYPE BASIN IN THE DEPOSITION PERIOD OF LAIYANG FORMATION AND THE ADVANTAGEOUS AREAS FOR OIL AND GAS EXPLORATION OF JIAOLAI BASIN

在线全文

学校读者我要写书评

暂无评论

Geotectonica et Metallogenia 2004年第2期28卷 142-156页

作者： wu zhiping LI Ling LI Wei ZHOU Yaoqi College of Earth''s Resources & Information Petroleum UniversityDongying Shandong 257061China College of Earth''s Resources & Information Petroleum UniversityDongying Shandong 257061China College of Earth''s Resources & Information Petroleum UniversityDongying Shandong 257061China College of Earth''s Resources & Information Petroleum UniversityDongying Shandong 257061China

Laiyang formation of Jiaolai Basin is the target stratum for oil and gas exploration. By measuring several field sections, the authors find that Laiyang formation reveals the whole processes from development to death of the lake basin and its sedimentary facies differ in different structural locations. Analyses about sedimentary facies and paleocurrent orientations in association with researches about the positive tectonic units such as Dayetou horseback and Chaigou horst indicate that Laiyang sag is a relatively independent sedimentary unit that shows great water depth typical of deep lake or semideep lake and was controlled by wulongcun fault during the deposition period of Laiyang formation. Its sediments mainly originated from Jiaobei uplift area and Dayetou horseback. Gaomi-Zhucheng sag was a fast-filled basin controlled by wurong fault and Yishu fault zone, being high in the northeast and low in the northwest and characterized by the development of pluvial facies and fluvial facies in most areas, and with the development of lake facies being limited to local low-lying regions. Selection of advantageous hydrocarbon reservoir areas for exploration purpose mainly relies on the sedimentation pattern of prototype basin and conservation conditions. The central-west area of Laiyang sag covered by overlying Laiyang formation is the most advantageous exploration area.

关键词： prototype basin advantageous area for oil exploration deposition period of Laiyang formation Jiaolai Basin

在线全文

学校读者我要写书评

暂无评论

TTM密码系统的扰动变形

计算机研究与发展 2006年第12期43卷 2082-2087页

作者：巫治平叶顶锋马卫局中国科学院研究生院信息安全国家重点实验室北京100049

把内部扰动加到TTM密码系统之上,构建了该密码系统的新变形·然后针对该变形给定小参数的实例,考察了它们在极小秩攻击和线性化函数方程攻击下的安全性·给出了该变形不存在线性化函数方程的必要条件;计算机模拟实验表明,该TTM密码系统... 详细信息

把内部扰动加到TTM密码系统之上,构建了该密码系统的新变形·然后针对该变形给定小参数的实例,考察了它们在极小秩攻击和线性化函数方程攻击下的安全性·给出了该变形不存在线性化函数方程的必要条件;计算机模拟实验表明,该TTM密码系统变形几乎不存在线性化函数方程·最后给出了一个实例,并且评估了其实现性能以及安全性·

关键词：公钥多变量扰动线性化函数方程

在线全文

学校读者我要写书评

暂无评论

考虑断层影响的煤层开采沉陷三维有限元模拟

辽宁工程技术大学学报（自然科学版） 2011年第5期30卷 702-705页

作者：吴志平上海应用技术学院城市建设与安全工程学院上海201418

为了解决山东某煤矿的煤层开采对周边俱乐部沉降的影响问题,采用有限元分析的方法并建立不同开采方案的三维地质模型,同时考虑断层的影响,计算出煤层开采后俱乐部四角的地表下沉状况。研究结果表明:回采3101工作面时俱乐部地表下沉最大... 详细信息

为了解决山东某煤矿的煤层开采对周边俱乐部沉降的影响问题,采用有限元分析的方法并建立不同开采方案的三维地质模型,同时考虑断层的影响,计算出煤层开采后俱乐部四角的地表下沉状况。研究结果表明:回采3101工作面时俱乐部地表下沉最大值达到382 mm,因此建议对俱乐部进行加固保护处理。该成果为研究最佳开采方案及周边俱乐部的保护提供重要依据,同时为浅埋煤层以及类似条件下中小矿山合理、安全、经济的开发提供了重要的参考依据。

关键词：数值分析煤层开采沉降有限元分析三维地质模型地表位移断层浅埋煤层

在线全文

学校读者我要写书评

暂无评论

生物质基温敏智能材料的研究进展

材料导报 2019年第19期33卷 3336-3346页

作者：刘德乡刘武叶志会吴志平中南林业科技大学材料科学与工程学院

温敏材料是重要的智能材料之一。虽然温敏均聚物具有良好的环境敏感性能,但其力学性能无法满足使用要求,且部分温敏均聚物的最低临界溶解温度(Lower critical solution temperature,LCST)难以改变,从而限制了其应用领域。当温敏聚合物... 详细信息

温敏材料是重要的智能材料之一。虽然温敏均聚物具有良好的环境敏感性能,但其力学性能无法满足使用要求,且部分温敏均聚物的最低临界溶解温度(Lower critical solution temperature,LCST)难以改变,从而限制了其应用领域。当温敏聚合物与其他基材复合或接枝共聚时,可以有效提升温敏材料的力学性能,同时通过改变物料组成及配比可以调节温敏材料的临界温度,拓展其应用范围。制备温敏智能材料的原料大多来源于不可再生的石油资源,随着石油资源日渐匮乏,人们逐渐将目光转移到其他资源。生物质作为可再生资源,广泛存在于自然界中,具有资源丰富、可持续利用的优点,特别是其含有羟基、胺基、醚键和羧基等活性官能团,可以提供多种活性位点,与温敏单体接枝共聚来制备温敏材料,是一种很好的温敏材料基材。已成功应用在生物质温敏智能材料中的生物质原料包括纤维素、纤维素醚、半纤维素、木质素、壳聚糖等。然而,制备生物质基温敏智能材料的接枝共聚方法单一,传统的自由基共聚制备的温敏材料存在温度响应范围窄、产生温敏均聚物较多且难分离以及制备的材料形态单一等问题。生物质温敏材料的接枝共聚方法已经从最初的以引发剂引发的普通自由基聚合发展到可控性较强的光引发自由基聚合、原子转移自由基聚合(Atom transfer radical polymerization,ATRP)、单电子转移活性自由基聚合(Single election transfer living radical polymerization,SET-LRP)、可逆加成-断裂链转移法(Reversible addition-fragmentation chain transfer,RAFT)等接枝共聚方法。温敏接枝单体较多,其中研究最多的为N-异丙基丙烯酰胺(N-isopropylacrylamide,NIPAM),其具有明确的临界溶解温度,且最低临界溶解温度与人体温度相差不大,它与生物质材料一起制备的温敏性膜、温敏性水凝胶和温敏性微球等在药物释放、组织工程和工农业等方面具有广泛的应用。本文详细归纳了生物质大分子制备温敏材料的方法,对这些接枝共聚方法的特点进行总结,同时介绍了制备温敏材料涉及的温敏物质、温度响应机理以及生物质基温敏智能材料的应用,最后总结了现阶段生物质基温敏智能材料制备及应用中存在的难点,并对未来的技术发展进行了展望。

关键词：生物质温敏性智能材料自由基聚合