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6,946篇文章
< 1 2 … 250 >
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：
Quick Prediction of Earthquake Ground Shaking Intensity Using High-Rate GNSS:A Case Study of the 2021 Mw 7.3 Maduo Earthquake 认领 引用
1
作者 Zhiyu Gao Yanchuan Li +4 位作者 Xinjian Shan Chuanchao Huang Xing Huang Kai Zheng Bo Li 《Journal of Earth Science》 SCIE CAS CSCD 2026年第1期351-360,共10页
Seismic intensity is critical for post-earthquake hazard assessment and response,but is often delayed because field surveys are required.Here,we propose a simple scheme for quick prediction of earthquake ground shakin... Seismic intensity is critical for post-earthquake hazard assessment and response,but is often delayed because field surveys are required.Here,we propose a simple scheme for quick prediction of earthquake ground shaking intensity using high-rate Global Navigation Satellite System(GNSS)data.In the scheme,high-rate GNSS displacement waveforms and static GNSS coseismic offsets are first used to invert the fault rupture process based on a one-fault model.The kinematic slip model is then employed as input for kinematic forward simulation to predict strong ground motion,which is subsequently convert into seismic intensities according to the China seismic intensity scale(GB/T 17742–2020).We take the 2021 Mw 7.3 Maduo Earthquake as a case study to illustrate the feasibility of this scheme.Our results show that the seismic intensity produced by the one-fault model is consistent with that from field investigations,especially in meizoseismal zones,suggesting that the scheme may serve as a potential solution for quick prediction of seismic intensity,which helps to disaster relief efforts after strong earthquakes. 展开更多
关键词 high-rate GNSS quick prediction of surface intensity Maduo Earthquake kinematic rupture process
暂未订购 下载PDF
Dual-score framework:National Early Warning Score 2 and quick Sequential Organ Failure Assessment scores in acute pyelonephritis 认领 引用
2
作者 Punith R Jain Suryaram Aravind +4 位作者 Prajeeth Reddy K Manikantan Shekar Velmurugan Palaniyandi Hariharasudhan Sekar Sriram Krishnamoorthy 《World Journal of Nephrology》 2026年第1期197-207,共11页
BACKGROUND Acute pyelonephritis(APN)is a significant part of the healthcare burden globally.Early risk stratification in APN is crucial to guide intensive care unit(ICU)admission and anticipate in-hospital mortality.T... BACKGROUND Acute pyelonephritis(APN)is a significant part of the healthcare burden globally.Early risk stratification in APN is crucial to guide intensive care unit(ICU)admission and anticipate in-hospital mortality.The relevance of scoring tools like quick Sequential Organ Failure Assessment(qSOFA)and National Early Warning Score 2(NEWS2)in urology-specific infections has been unclear.Our study is among the first to prospectively compare the qSOFA and NEWS2 scores exclusively in non-emphysematous APN,a real-world cohort previously overlooked in research.AIM To assess the accuracy of NEWS2 and qSOFA scores in predicting ICU admission,in-hospital mortality and their role in guiding urological interventions among adults with APN.METHODS A prospective observational study,conducted at a tertiary care centre in South India over two years,on adult patients diagnosed clinically and radiologically with APN.Comprehensive clinical,laboratory,and imaging parameters were recorded.The cohort was stratified into patients requiring ICU and not requiring ICU to assess differences across parameters.The discriminative power of the NEWS2 and qSOFA scores for predicting expedited care and mortality was analyzed.RESULTS The NEWS2 score≥5 emerged as a robust tool,identifying nearly all patients requiring ICU admission[sensitivity,98.1%;area under the receiver operating characteristic curve(AUC):0.977;P<0.05]and predicting intervention with high accuracy(AUC-0.823;P<0.05).However,the qSOFA≥2 score proved to be the silent sentinel of mortality(AUC-0.839;P<0.05),outperforming the NEWS2 score in prognostication.Interestingly,patients who later required ICU care had elevated NEWS2 scores at baseline,suggesting the missed early red flags.To the best of our knowledge,this is the first and largest prospective study to compare NEWS2 and qSOFA scores exclusively in nonobstructive,non-emphysematous APN.CONCLUSION In APN,NEWS2(≥5)proved to be a pragmatic trigger for ICU triage,while qSOFA(≥2)better flagged in-hospital mortality.Together,they form a complementary framework as a simple,objective,and lifesaving bedside tool. 展开更多
关键词 Acute pyelonephritis Triage Intervention In-hospital mortality Quick Sequential Organ Failure Assessment National Early Warning Score 2 Early warning scores
暂未订购 下载PDF
基于改进Quick-RRT*算法的机器人路径规划研究 认领 引用
3
作者 李明泽 谭光兴 +1 位作者 黄磊昌 李春宇 《广西科技大学学报》 CAS 2026年第3期74-84,共11页
针对传统Quick-RRT*算法在规划移动机器人路径时存在随机性强、精度低以及收敛到最优解速度慢等问题,本文提出一种改进的Quick-RRT*路径规划算法。该改进算法在找到一条初始路径前,采用可变采样区域的目标偏置采样策略,以快速绕... 针对传统Quick-RRT*算法在规划移动机器人路径时存在随机性强、精度低以及收敛到最优解速度慢等问题,本文提出一种改进的Quick-RRT*路径规划算法。该改进算法在找到一条初始路径前,采用可变采样区域的目标偏置采样策略,以快速绕过障碍物并引导随机树直接朝向目标生长,缩短了找到初始路径的时间;找到初始路径后,使用结合信标的椭球子集采样策略,在椭球子集约束采样区域和障碍物附近进行有偏采样来持续优化路径。同时,通过采用分层碰撞检测算法,避免重复进行无效的碰撞检测。然后,根据节点邻域中的障碍物与节点密度自适应地调整重连半径,以提高收敛速度。在障碍物稠密、简易迷宫、横“H”型3种二维仿真环境中的实验结果表明:与RRT*、Quick-RRT*、RRT*-Smart、A*算法、遗传算法、粒子群算法6种算法相比,改进算法的规划路径长度更短、规划成功率更高、规划耗时更少。最后,在三维环境仿真实验中,进一步验证了该算法用于路径规划的实用性和可靠性。 展开更多
关键词 移动机器人 路径规划 Quick-RRT*算法 启发式采样 可变采样区域 分层碰撞检测
暂未订购 下载PDF
Quick-dry fabrics:What fabric dries faster? 认领 引用
4
作者 Zhao Xinhua 《China Textile》 2025年第4期26-27,共2页
In today's fast-paced modern life, whether for fitness training, outdoor adventures, or daily commutes, we all yearn for quick-dry apparel that can rapidly wick away moisture and keep our bodies dry and comfortabl... In today's fast-paced modern life, whether for fitness training, outdoor adventures, or daily commutes, we all yearn for quick-dry apparel that can rapidly wick away moisture and keep our bodies dry and comfortable. As a standout in functional textiles, quick-dry fabrics are becoming the top choice for more and more people, thanks to their exceptional moisture-wicking performance and rapid drying capabilities. 展开更多
关键词 quick dry fabrics functional textilesquick dry moisture wicking functional textiles rapid drying fitness trainingoutdoor
暂未订购 下载PDF
Rational catalyst design for N2 electro-reduction: Regulation strategies and quick screen towards enhanced conversion efficiency 认领 引用
5
作者 Jinzhou Zheng Chaozheng He Chenxu Zhao 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第7期159-165,共7页
Ammonia is a key industry raw material for fertilizers and the electro-reduction of N2(NRR)can be served as a promising method.It is urgently needed to discover advanced catalysts while the lack of design principle... Ammonia is a key industry raw material for fertilizers and the electro-reduction of N2(NRR)can be served as a promising method.It is urgently needed to discover advanced catalysts while the lack of design principles still hinders the high-throughput screen of efficient candidates.Herein,we have provided an up-to-date review of NRR catalysts mainly on theoretical works and highlighted the latest achievements on descriptors,which can be served as valid guidance of optimal catalysts.The descriptors are classified with adsorption energy and the corresponding derived ones,which can screen the NRR catalysts from various aspects.Finally,the challenges and opportunities in the descriptor field are presented. 展开更多
关键词 N2electroreduction Regulation strategy Quick screen Descriptor
暂未订购 下载PDF
Quick Response Code在手术室新护士及实习生临床培训考核中的应用 认领 引用 被引量：1
6
作者 叶文婕 金鑫 《中国药物经济学》 2025年第9期125-128,共4页
目的探讨Quick Response Code在手术室新护士及实习生临床培训考核中的应用效果。方法选取2023年12月至2024年11月九江市第一人民医院手术室的新护士及实习生共100名,按随机数字表法分为观察组和对照组,每组50名。对照组采用常规培训与... 目的探讨Quick Response Code在手术室新护士及实习生临床培训考核中的应用效果。方法选取2023年12月至2024年11月九江市第一人民医院手术室的新护士及实习生共100名,按随机数字表法分为观察组和对照组,每组50名。对照组采用常规培训与管理,观察组在对照组基础上增加Quick Response Code培训,比较两组的培训效果。结果观察组理论考核评分和操作考核评分分别为(92.37±4.69)分和(91.16±4.31)分,均高于对照组的(85.12±3.86)分和(86.43±3.85)分(P<0.05)。观察组培训总满意度为96.00%,高于对照组的82.00%(P<0.05)。观察组仪器设备损耗率和不良事件发生率分别为0.00%和2.00%,均低于对照组的8.00%和14.00%(P<0.05)。观察组各项核心胜任力评分及总分均高于对照组(P<0.05)。结论Quick Response Code在手术室新护士及实习生临床培训考核中的应用效果显著,可提高新护士及实习生的考核成绩与满意度,降低仪器设备损耗率及不良事件发生率,同时可提升核心胜任力。 展开更多
关键词 新护士 实习生 手术室 Quick Response Code 培训考核
暂未订购 下载PDF
爱图仕发布全新Quick Dome系列柔光罩 认领 引用
7
《影视制作》 2025年第11期118-118,共1页
爱图仕全新Quick Dome系列柔光罩,搭载全新快拆锁扣结构,融入人体工学设计,增加侧向延伸手柄,仅需按压解锁,即可在数秒内完成柔光箱的安装或拆卸。全系列提供90cm、60cm、40cm三种柔光直径,可满足多样拍摄场景需求。其中,Quick Dome 90... 爱图仕全新Quick Dome系列柔光罩,搭载全新快拆锁扣结构,融入人体工学设计,增加侧向延伸手柄,仅需按压解锁,即可在数秒内完成柔光箱的安装或拆卸。全系列提供90cm、60cm、40cm三种柔光直径,可满足多样拍摄场景需求。其中,Quick Dome 90/60柔光箱采用卡扣式可拆卸保荣卡口设计,兼容绝大多数配备保荣卡口的影视灯光设备。搭载电影级工业柔光组件,配合独家16杆32面专利结构,构建均匀而立体的光线输出基础。而Quick Dome 40柔光箱则专为爱图仕STORM 80c设计,整体采用8杆高强度钢骨支撑,设计精巧紧凑。其小巧的体型与Mini Pro Lock卡口相结合,大幅提升了移动性与空间适应性。 展开更多
关键词 柔光罩 爱图仕 Quick Dome系列
暂未订购 下载PDF
对流扩散方程QUICK格式的数值摄动高精度重构格式 认领 引用 被引量：2
8
作者 朱可 李明军 《力学学报》 EI CAS CSCD 北大核心 2011年第1期55-62,共8页
利用高智提出的数值摄动算法,把对流扩散方程的常用QUICK格式(黏性和对流项分别用二阶中心和QUICK格式离散)进行了高精度重构,包括利用离散单元内所有结点的全域重构和分别利用离散单元内上下游结点的上下游重构,得到两类新的更高阶精... 利用高智提出的数值摄动算法,把对流扩散方程的常用QUICK格式(黏性和对流项分别用二阶中心和QUICK格式离散)进行了高精度重构,包括利用离散单元内所有结点的全域重构和分别利用离散单元内上下游结点的上下游重构,得到两类新的更高阶精度的数值摄动重构格式,称为高的QUICK格式(G-QUICK格式).G-QUICK格式与QUICK格式相比简单性相当,但精度更高;全域重构G-QUICK格式和QUICK格式均为条件稳定,上下游重构得到一些绝对稳定的G-QUICK格式.解析分析和数值算例均证实了G-QUICK格式的优良性能,上下游重构的G-QUICK格式为在对流扩散方程的QUICK格式中避免使用人工黏性提供了新途径. 展开更多
关键词 计算流体力学 对流扩散方程 QUICK格式 数值摄动高精度重构 G-QUICK格式
暂未订购 下载PDF
QUICK与多种差分方案的比较和计算 认领 引用 被引量：22
9
作者 杨茉 李学恒 +1 位作者 陶文铨 OZOEHiroyuki 《工程热物理学报》 EI CAS 北大核心 1999年第5期593-597,共5页
本文用QUICK和多种差分方案计算了四个流动与换热问题．计算结果表明。对于强制流动问题，QUICK用较粗网格就能得到其他差分方案用较细网格才能得到的结果。对稳态自然对流，QUICK与其他差分方案的计算结果相近，但QUICK方案能预测出所... 本文用QUICK和多种差分方案计算了四个流动与换热问题．计算结果表明。对于强制流动问题，QUICK用较粗网格就能得到其他差分方案用较细网格才能得到的结果。对稳态自然对流，QUICK与其他差分方案的计算结果相近，但QUICK方案能预测出所计算的低Pr数流体自然对流的物理振荡，而其他几种方案不能． 展开更多
关键词 差分方案 数值传热 流动传热 QUICK 传热
暂未订购 下载PDF
基于QuickBird影像的城市高大地物阴影检测方法 认领 引用 被引量：16
10
作者 姚花琴 杨树文 +2 位作者 刘正军 杨兴旺 李轶鲲 《国土资源遥感》 CSCD 北大核心 2015年第2期51-55,共5页
针对利用高分辨率遥感影像检测阴影时受水体和偏蓝色地物影像的影响问题,提出了一种主成分变换和多波段运算相结合的阴影检测方法。首先,统计、分析了Quick Bird影像中阴影、水体及建筑物等典型地物的光谱特征;然后,基于主成分变换和多... 针对利用高分辨率遥感影像检测阴影时受水体和偏蓝色地物影像的影响问题,提出了一种主成分变换和多波段运算相结合的阴影检测方法。首先,统计、分析了Quick Bird影像中阴影、水体及建筑物等典型地物的光谱特征;然后,基于主成分变换和多波段运算相结合的方法识别阴影区域和非阴影区域,并利用多峰直方图阈值算法对阴影进行自动检测;最后,利用形态学滤波算法对检测结果进行后处理。实验结果表明,该方法对Quick Bird影像中的阴影提取具有较高的精度、效率和普适性。 展开更多
关键词 Quick Bird影像 主成分变换 阴影检测 形态学滤波
暂未订购 下载PDF
Local structural evolutions of CuO/ZnO/Al2O3 catalyst for methanol synthesis under operando conditions studied by in situ quick X-ray absorption spectroscopy 认领 引用 被引量：5
11
作者 Xue-Ping Sun Fan-Fei Sun +5 位作者 Song-Qi Gu Jing Chen Xian-Long Du Jian-Qiang Wang Yu-Ying Huang Zheng Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2017年第2期35-43,共9页
In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for met... In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for methanol synthesis. In this work, the catalyst, whose activity increases with the reaction temperature and pressure, was studied at calcined, reduced, and reacted conditions. TEM and EDX images for the calcined and reduced catalysts showed that copper was distributed uniformly at both conditions. TPR profile revealed two reduction peaks at 165 and 195 °C for copper species in the calcined catalyst. QXAFS results demonstrated that the calcined form consisted mainly of a mixed Cu O and Zn O, and it was progressively transformed into Cu metal particles and dispersed Zn O species as the reduction treatment. It was demonstrated that activation of the catalyst precursor occurred via a Cu^+intermediate, and the active catalyst predominantly consisted of metallic Cu and Zn O evenunder higher pressures. Structure of the active catalyst did not change with the temperature or pressure, indicating that the role of the Zn was mainly to improve Cu dispersion.This indicates the potential of QXAFS method in studying the structure evolutions of catalysts in methanol synthesis. 展开更多
关键词 In situ Quick X-ray absorption spectroscopy CuO/ZnO/Al2O3 catalyst Operando condition
暂未订购 下载PDF
基于Douglas-Peucker和Quick Bundles算法的水上交通模式识别 认领 引用 被引量：4
12
作者 陈信强 徐祥龙 +3 位作者 彭静 孙洋 王梓创 阎莹 《上海海事大学学报》 北大核心 2022年第3期1-6,共6页
针对船舶航迹数据量大、数据冗余、航迹特征不明显等问题,提出一种融合道格拉斯-普克(Douglas-Peucker,DP)压缩算法和基于距离的快速捆绑包(Quick Bundles,QB)聚类算法的水上交通模式识别方法。该方法根据航迹数据特征、压缩率和压缩误... 针对船舶航迹数据量大、数据冗余、航迹特征不明显等问题,提出一种融合道格拉斯-普克(Douglas-Peucker,DP)压缩算法和基于距离的快速捆绑包(Quick Bundles,QB)聚类算法的水上交通模式识别方法。该方法根据航迹数据特征、压缩率和压缩误差等指标选择合理的压缩阈值实现大规模船舶自动识别系统(automatic identification system,AIS)数据的压缩。在此基础上,提出一种基于最小直接翻转距离的聚类指标,利用QB算法实现船舶航迹的有效聚类。实验结果表明,提出的方法既可以简化航迹聚类过程,也可准确高效地实现航迹聚类,为水上交通精细化管理与决策提供数据支撑。 展开更多
关键词 船舶航迹聚类 船舶自动识别系统(AIS) Douglas-Peucker算法 Quick Bundles算法
暂未订购 下载PDF
Numerical study of current fields near the Changjiang Estuary and impact of Quick-EnKF assimilation 认领 引用 被引量：7
13
作者 CHEN Xueen ZHAN Peng +1 位作者 CHEN Jinrui QIAN Hongbao 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2011年第5期33-44,共12页
A 30-d current numerical simulation is running for the Yangshan Port,the Changjiang Estuary,the Hangzhou Bay and their adjacent seas using a finite volume coastal ocean model （FVCOM）,with Changjiang River runoff and... A 30-d current numerical simulation is running for the Yangshan Port,the Changjiang Estuary,the Hangzhou Bay and their adjacent seas using a finite volume coastal ocean model （FVCOM）,with Changjiang River runoff and wind effect being considered.At the open boundary,this model is driven by the water level obtained from prediction including eight main partial tides.After the harmonic analysis,the cotidal chart and the iso-amplitude line as well as the current ellipse distribution map are displayed to illustrate the propagation property of a tidal wave.Horizontal velocity of both the U and V components coincides with the actual measurement,which shows that the model result is credible to describe the hydrodynamic pattern in this sea area.On this basis,real-time current data from high-frequency radar is assimilated with the implementation of quick ensemble Kalman filter,which takes the variation tendency of the state vector to compute the analysis field,instead of integrating the field for N （the number of ensemble） times as it used to in the standard EnKF,aiming at raising the efficiency of computation,reducing the error of prediction and at the same time,improving the forecast effect. 展开更多
关键词 Yangshan Port finite volume coastal ocean model current quick ensemble Kalman filter assimilation
暂未订购 下载PDF
Comparison of different versions of the quick sequential organ failure assessment for predicting in-hospital mortality of sepsis patients:A retrospective observational study 认领 引用 被引量：13
14
作者 Hai Hu Jing-yuan Jiang Ni Yao 《World Journal of Emergency Medicine》 SCIE CAS CSCD 2022年第2期114-119,共6页
BACKGROUND:The quick sequential organ failure assessment(qSOFA)is recommended to identify sepsis and predict sepsis mortality.However,some studies have recently shown its poor performance in sepsis mortality predictio... BACKGROUND:The quick sequential organ failure assessment(qSOFA)is recommended to identify sepsis and predict sepsis mortality.However,some studies have recently shown its poor performance in sepsis mortality prediction.To enhance its effectiveness,researchers have developed various revised versions of the qSOFA by adding other parameters,such as the lactate-enhanced qSOFA(LqSOFA),the procalcitonin-enhanced qSOFA(PqSOFA),and the modified qSOFA(MqSOFA).This study aimed to compare the performance of these versions of the qSOFA in predicting sepsis mortality in the emergency department(ED).METHODS:This retrospective study analyzed data obtained from an electronic register system of adult patients with sepsis between January 1 and December 31,2019.Receiver operating characteristic(ROC)curve analyses were performed to determine the area under the curve(AUC),with sensitivity,specificity,and positive and negative predictive values calculated for the various scores.RESULTS:Among the 936 enrolled cases,there were 835 survivors and 101 deaths.The AUCs of the LqSOFA,MqSOFA,PqSOFA,and qSOFA were 0.740,0.731,0.712,and 0.705,respectively.The sensitivity of the LqSOFA,MqSOFA,PqSOFA,and qSOFA were 64.36%,51.40%,71.29%,and 39.60%,respectively.The specificity of the four scores were 70.78%,80.96%,61.68%,and 91.62%,respectively.The LqSOFA and MqSOFA were superior to the qSOFA in predicting in-hospital mortality.CONCLUSIONS:Among patients with sepsis in the ED,the performance of the PqSOFA was similar to that of the qSOFA and the values of the LqSOFA and MqSOFA in predicting in-hospital mortality were greater compared to qSOFA.As the added parameter of the MqSOFA was more convenient compared to the LqSOFA,the MqSOFA could be used as a candidate for the revised qSOFA to increase the performance of the early prediction of sepsis mortality. 展开更多
关键词 Quick sequential organ failure assessment In-hospital mortality Sepsis Lactate-enhanced qSOFA Modified qSOFA
暂未订购 下载PDF
基于双树Quick-RRT*算法的移动机器人路径规划 认领 引用 被引量：20
15
作者 魏武 韩进 +1 位作者 李艳杰 高天啸 《华南理工大学学报（自然科学版）》 EI CAS CSCD 北大核心 2021年第7期51-58,共8页
最优快速拓展随机树(RRT*)是一种渐进最优的移动机器人路径规划方法,Quick-RRT*缩短了RRT*的初始路径长度,提高了路径收敛速度。为进一步提高Quick-RRT*的收敛速度,文中提出了一种双树Quick-RRT*算法。首先,基于Quick-RR... 最优快速拓展随机树(RRT*)是一种渐进最优的移动机器人路径规划方法,Quick-RRT*缩短了RRT*的初始路径长度,提高了路径收敛速度。为进一步提高Quick-RRT*的收敛速度,文中提出了一种双树Quick-RRT*算法。首先,基于Quick-RRT*算法在起点和终点分别生成一棵随机树,起点树和终点树轮流生长,两棵树的连接采用贪婪法;然后,对提出的算法的概率完备性和渐进最优性进行理论分析,证明了算法的概率完备性和渐进最优性;最后,基于Matlab平台,在3种环境下采用双树Quick-RRT*与RRT*、Quick-RRT*和双向RRT*算法进行了对比仿真实验。结果表明,文中改进的算法不仅可以在更短的时间内找到初始路径和次优路径,而且初始路径更短。 展开更多
关键词 路径规划 移动机器人 Quick-RRT* 初始路径 收敛速度
暂未订购 下载PDF
Quick Evaluation of Present-Day Low-Total Organic Carbon Carbonate Source Rocks from Rock-Eval Data:Middle-Upper Ordovician in the Tabei Uplift,Tarim Basin 认领 引用 被引量：5
16
作者 CHEN Junqing PANG Xiongqi +2 位作者 YANG Haljun PANG Hong PANG Bo 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2018年第4期1558-1573,共16页
Previous studies have postulated the contribution of present-day low-total organic carbon(TOC)marine carbonate source rocks to oil accumulations in the Tabei Uplift,Tarim Basin,China.However,not all present-day low-TO... Previous studies have postulated the contribution of present-day low-total organic carbon(TOC)marine carbonate source rocks to oil accumulations in the Tabei Uplift,Tarim Basin,China.However,not all present-day low-TOC carbonates have generated and expelled hydrocarbons;therefore,to distinguish the source rocks that have already expelled sufficient hydrocarbons from those not expelled hydrocarbons,is crucial in source rock evaluation and resource assessment in the Tabei Uplift.Mass balance can be used to identify modern low-TOC carbonates resulting from hydrocarbon expulsion.However,the process is quite complicated,requiring many parameters and coefficients and thus also a massive data source.In this paper,we provide a quick and cost effective method for identifying carbonate source rock with present-day low TOC,using widely available Rock-Eval data.First,we identify present-day low-TOC carbonate source rocks in typical wells according to the mass balance approach.Second,we build an optimal model to evaluate source rocks from the analysis of the rocks'characteristics and their influencing factors,reported as positive or negative values of a dimensionless index of Rock-Eval data(IR).Positive IR corresponds to those samples which have expelled hydrocarbons.The optimal model optimizes complicated calculations and simulation processes;thus it could be widely applicable and competitive in the evaluation of present-day low TOC carbonates.By applying the model to the Rock-Eval dataset of the Tabei Uplift,we identify present-day iow-TOC carbonate source rocks and primarily evaluate the contribution equivalent of 11.87×10^9 t oil. 展开更多
关键词 present-day low-TOC carbonate source rocks quick evaluation model Rock-Eval TabeiUplift
暂未订购 下载PDF
基于Quick Bird遥感影像的铜仁市城市绿地景观结构特征分析 认领 引用 被引量：7
17
作者 王志泰 王志杰 包玉 《西北林学院学报》 北大核心 2010年第1期166-170,共5页
以2004年9月4日Quick Bird遥感影像,辅以实时动态差分GPS RTK技术高精度定位,运用GIS技术和景观斑块谱分析方法,对铜仁市城市绿地景观结构特征进行分析。结果表明:(1)铜仁市城市绿地斑块面积5 857.96 hm2,斑块数量6 503块,规划区绿地斑... 以2004年9月4日Quick Bird遥感影像,辅以实时动态差分GPS RTK技术高精度定位,运用GIS技术和景观斑块谱分析方法,对铜仁市城市绿地景观结构特征进行分析。结果表明:(1)铜仁市城市绿地斑块面积5 857.96 hm2,斑块数量6 503块,规划区绿地斑块面积和斑块数量均大于中心城区;(2)在各种绿地类型中,其他绿地在斑块面积上占绝对优势,其次为农业用地和生产防护绿地,道路绿地面积最小。在斑块数量上,居住区绿地>农业用地>其他绿地>生产防护绿地>道路绿地>单位附属绿地>公园绿地;(3)按绿地斑块面积统计,大于10 000 m2的大型绿地占绝对优势,占整个绿地面积的92.44%,按斑块数量统计,小于500 m2的小型斑块占优势,占整个绿地斑块的69.72%;(4)小型斑块以居住区绿地最多,其次为农业用地和其他绿地等,公园绿地最少;中型斑块和大中型斑块以农业用地最多,大型斑块在面积上以其他绿地最多,数量上以农业用地最多;公园绿地和居住区绿地在各等级绿地斑块中,面积和斑块数量相对较小。综合分析,铜仁市在今后的城市绿地建设中,中心城区内应加强绿化力度,适当将现有的绿地扩大连片,规划区内应合理调整和规划绿地性质,丰富绿地功能特性,注重绿地结构的合理规划,将小型、中型绿地尽可能有效地连片,增加大中型绿地斑块,特别是在与人居密切相关的居住区、单位和街道等周围,增加大中型绿地、大型绿地,以满足人们生产生活对绿地的需求,同时,保护生物多样性,优化城市生态环境。 展开更多
关键词 城市绿地 景观结构 Quick Bird 景观斑块谱 铜仁市
暂未订购 下载PDF
基于Quick Bird数据的胡杨、柽柳种群格局分析 认领 引用 被引量：4
18
作者 张绘芳 李霞 高亚琪 《新疆农业科学》 CAS CSCD 北大核心 2012年第11期2029-2034,共6页
[目的]对塔里木河下游主要木本植物胡杨、柽柳的树冠进行解译。根据解译结果,使用修正后最近邻体法分析胡杨、柽柳的格局分布。[方法]基于Quick bird数据,采用人机对话目视解译方法。[结果]胡杨和柽柳在不同离河距离均为聚集分布,格局... [目的]对塔里木河下游主要木本植物胡杨、柽柳的树冠进行解译。根据解译结果,使用修正后最近邻体法分析胡杨、柽柳的格局分布。[方法]基于Quick bird数据,采用人机对话目视解译方法。[结果]胡杨和柽柳在不同离河距离均为聚集分布,格局强度胡杨随离河距离加大(地下水埋深降低)而增加,到离河1500 m又减小;柽柳灌丛格局强度总体上呈随离河距离增加而降低的趋势。运用高分辨遥感数据确定胡杨、柽柳群落分布格局,取得了与传统地面调查相同的结果,用遥感方法从定量角度验证了干旱区荒漠区胡杨、柽柳群落大都为聚集分布的定性结论。[结论]在植被稀疏的干旱荒漠区使用高分辨遥感数据可以定量分析木本植物建群种的分布格局特征。 展开更多
关键词 胡杨 柽柳 分布格局 Quick Bird数据 塔里木河下游
暂未订购 下载PDF
基于QuickBird影像的离子型稀土矿区土地利用及景观格局分析 认领 引用 被引量：4
19
作者 李恒凯 李芹 王秀丽 《稀土》 CAS CSCD 北大核心 2019年第5期73-83,共11页
离子型稀土开采导致的土地毁损带来严重的生态环境问题。为精细研究稀土矿区土地毁损及恢复状况,并从矿点尺度分析稀土开采对土地利用的影响,以岭北稀土矿区2005年、2009年和2013年的Quick Bird影像为数据源,在现场调查基础上,根据矿区... 离子型稀土开采导致的土地毁损带来严重的生态环境问题。为精细研究稀土矿区土地毁损及恢复状况,并从矿点尺度分析稀土开采对土地利用的影响,以岭北稀土矿区2005年、2009年和2013年的Quick Bird影像为数据源,在现场调查基础上,根据矿区特点,划分土地利用类型及构建解译标志,获取精准土地利用信息并进行变化分析。针对矿区特点,选取相应的类型水平和景观水平指数,分析稀土矿区土地利用和景观格局变化特征。结果表明,稀土开采模式对矿区及矿点土地利用有较大影响,变化最大的为沉淀池、尾砂地、复垦植被和植被四种地类。在人类活动的影响下,地类整体斑块密度趋于均匀,景观趋于丰富和复杂化。该研究结果为稀土矿区土地资源可持续开发和利用以及生态环境保护提供科学依据。 展开更多
关键词 Quick Bird影像 离子型稀土 矿区土地利用 景观格局分析
暂未订购 下载PDF
基于Quick Bird影像的城市绿地景观信息提取研究 认领 引用 被引量：6
20
作者 黄树春 李书 薛重生 《安徽农业科学》 CAS 北大核心 2007年第2期396-397,共2页
以武汉鲁巷快鸟影像为主要数据源,结合地形图及相关社会统计资料,利用多尺度影像分割与监督分类方法、植被指数方法相结合来提取城市绿地景观信息。结果表明:该方法交叉结合能大大地提高提取绿地景观信息的精度,更好地反映城市微观信息... 以武汉鲁巷快鸟影像为主要数据源,结合地形图及相关社会统计资料,利用多尺度影像分割与监督分类方法、植被指数方法相结合来提取城市绿地景观信息。结果表明:该方法交叉结合能大大地提高提取绿地景观信息的精度,更好地反映城市微观信息,满足现代城市发展的要求。 展开更多
关键词 Quick Bird影像 绿地景观 多尺度影像分割
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 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈