检索结果-南通市图书馆

基于高分辨率层序约束的薄储层地震预测方法研究

在线全文

学校读者我要写书评

暂无评论

地球物理学进展 2024年第2期39卷 606-619页

作者：成锁赵光亮王鑫吴亚宁邓忠毅陈强肖文黄捍东唐有彩中国石油塔里木油田公司勘探开发研究院库尔勒841000 中国石油大学(北京)地球物理学院北京102249

塔里木油田碎屑岩储层埋深大,储层物性好且油气资源含量大,但面临砂岩和泥岩频繁交互发育、岩性横向变化快、单储层厚度较薄的难题.常规地震反演技术由于低频初始模型精度低和横向约束性弱,难以满足深部薄储层预测需求.本文基于贝叶斯... 详细信息

塔里木油田碎屑岩储层埋深大,储层物性好且油气资源含量大,但面临砂岩和泥岩频繁交互发育、岩性横向变化快、单储层厚度较薄的难题.常规地震反演技术由于低频初始模型精度低和横向约束性弱,难以满足深部薄储层预测需求.本文基于贝叶斯反演理论和INPEFA(Integrated Prediction Error Filter Analysis)层序划分理论,提出了一种高分辨率层序约束的叠后贝叶斯反演方法.该方法首先通过INPEFA技术建立井上高分辨率层序格架,结合序贯高斯模拟方法建立精度高低频初始模型,同时在高分辨率层序约束下利用相邻道的相近性,在地震反演中引入横向约束算子,最终获得高分辨率和高稳定性的反演结果.该方法在轮古地区深部碎屑岩储层预测应用,有效提高了薄储层成像精度,纵向结果可识别3 m的薄储层,同时能准确刻画砂体的横向变化情况,解决了该地区深部碎屑岩薄储层预测的难题,为研究区进一步的勘探部署提供了有力支撑.

关键词：高分辨率层序 INPEFA技术贝叶斯理论低频初始模型薄储层预测

厌氧颗粒污泥高效反硝化处理高盐度树脂再生液

在线全文

学校读者我要写书评

暂无评论

中国给水排水 2024年第7期40卷 19-26页

作者：李忠强骆倩黄慧敏梅荣武胡正峰张胜军浙江省生态环境科学设计研究院浙江杭州310007 浙江师范大学地理与环境科学学院浙江金华321019 浙江环科环境研究院有限公司浙江杭州310007 国家环境保护水污染控制工程技术<浙江>中心浙江省环境污染控制技术研究重点实验室浙江杭州310007

针对目前离子交换树脂再生液高盐度的问题,在上流式污泥床反应器内接种厌氧颗粒污泥,采用连续进水的方式逐步提高进水NO_(3)^(-)-N负荷和盐度,对污泥进行驯化。优化反应器运行参数,得到最适盐度为2.0%、HRT为12 h、C/N为3.3、上升流速为... 详细信息

针对目前离子交换树脂再生液高盐度的问题,在上流式污泥床反应器内接种厌氧颗粒污泥,采用连续进水的方式逐步提高进水NO_(3)^(-)-N负荷和盐度,对污泥进行驯化。优化反应器运行参数,得到最适盐度为2.0%、HRT为12 h、C/N为3.3、上升流速为1.5 m/h。在该参数下TN去除率达90%以上,出水TN低于10 mg/L,极限脱氮与再生液处理混合出水TN<1.5 mg/L,达到地表水Ⅳ类标准,处理费用为0.587元/m^(3)。对运行前中后期的颗粒污泥进行电镜和高通量测序,污泥表面杆状菌明显增多,变形菌门占比随时间增加,反硝化杆菌逐渐成为优势菌种。该城镇污水处理厂尾水树脂极限脱氮及高盐度再生液处理技术经济高效,为树脂再生废水的处理提供了新的选择。

关键词：树脂再生液颗粒污泥反硝化高盐度微生物群落

PM_(2.5)concentration declining saves health expenditure in China

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第7期17卷 175-186页

作者： Yang Xie Hua Zhong Zhixiong Weng Xinbiao guo Satbyul Estlla Kim Shaowei wu School of Economics and Management Beihang UniversityBeijing 100191China Laboratory for Low-carbon Intelligent Governance Beihang UniversityBeijing 100191China Institute of Circular Economy Beijing University of TechnologyBeijing 100124China Department of Occupational and Environmental Health Sciences School of Public HealthPeking UniversityBeijing 100871China Faculty of Health and Sport Sciences University of TsukubaTsukuba 305-8577Japan Department of Occupational and Environmental Health School of Public HealthXi'an Jiaotong University Health Science CenterXi'an 710049China

Air pollution has been a severe issue in *** to PM_(2.5)has adverse health effects and causes economic *** study investigated the economic impact of exposure to PM_(2.5)pollution using monthly city-level data covering 88.3 million urban employees in 2016 and *** study mainly focused on three expenditure indicators to measure the economic impact considering lower respiratory infections(LRIs),coronary heart disease(CHD),and *** results show that a 10μg/m3 increase in PM_(2.5)would cause total monthly expenses of LRIs,CHD,and stroke to increase by 0.226%,0.237%,and 0.374%,*** also found that LRI,CHD,and stroke hospital admissions increased significantly by 10%,8.42%,and 5.64%,***,the total hospital stays of LRIs,CHDs,and strokes increased by 2.49%,2.51%,and 1.64%,*** findings also suggest heterogeneous impacts of PM2s exposures by sex and across regions,but no statistical evidence shows significant differences between the older and younger adult *** results provide several policy implications for reducing unequal public health expenditures in overpolutedcountries.

关键词： Air pollution Heaith expenditure PM_(2.5)concentration Economic impact Heterogeneous effect

Surface defect detection competition with a bio-inspired vision sensor

在线全文

学校读者我要写书评

暂无评论

National Science Review 2023年第6期10卷 31-34页

作者： Anjing guo Jupo Ma Renwei Dian Fuyan Ma Jinjian wu Shutao Li School of Robotics Hunan University School of Artificial Intelligence Xidian University Pazhou Laboratory (Huangpu) College of Electrical and Information Engineering Hunan University Key Laboratory of Visual Perception and Artificial Intelligence of Hunan Province

INTRODUCTION Surface defects are inevitable during the product manufacturing process,such as impurities,scratches and dirt.D efects not only reduce the aesthetics and comfort of products,but may also degrade the functional *** are very concerned about inadequate defect detection because of potential economic and reputation ***,it is significant to study automatic defect detection *** machine vision-based defect detection mostly adopts a traditional CCD or CMOS vision sensor (VS) for ***,in real-world production lines,due to dynamic environments,traditional VS encounters difficulties in meeting the demands of defect detection,especially in modern high-precision product manufacturing.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

空间站CO_(2)去除系统节气技术研究

载人航天 2024年第1期30卷 1-8页

作者：张勇平卞强吴志强王洪亮杨润泽张震白攀峰中国航天员科研训练中心人因工程重点实验室北京100094 中国地质科学院郑州矿产综合利用研究所郑州450006

针对空间站CO_(2)去除系统周期性真空解吸会损失大量气体的问题,对系统的节气技术进行研究。从分子筛材料的吸附及解吸特性出发,研究影响系统气体损失量的关键因素。结合系统运行流程和运行周期,综合考虑节气泵工作特性、寿命要求和系统... 详细信息

针对空间站CO_(2)去除系统周期性真空解吸会损失大量气体的问题,对系统的节气技术进行研究。从分子筛材料的吸附及解吸特性出发,研究影响系统气体损失量的关键因素。结合系统运行流程和运行周期,综合考虑节气泵工作特性、寿命要求和系统的CO_(2)去除性能,提出了满足指标要求的系统节气方案。采用对损失气体进行实测采样的方法对系统的气体损失量进行了试验验证。试验数据及空间站在轨运行数据表明:设计的节气方案可以控制系统的气体损失量小于45 g/d,提出方案满足设计指标要求。

关键词：空间站 CO_(2)去除系统气体损失节气方案

维普期刊数据库博看期刊

Global cavitation and hydrodynamic characteristics of a composite propeller in non-uniform wake

在线全文

学校读者我要写书评

暂无评论

水动力学研究与进展B辑:英文版 2023年第3期35卷 498-515页

作者： Dan-dan Zhang Lu-lu Dong Qin wu Jing Zhang guo-yu Wang School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China China Academy of Launch Vehicle Technology Systems Engineering Division Beijing 100076China

The composite propeller has attracted much interest due to its excellent mechanical properties such as high specific stiffness and high specific strength,hence there is an increasing interest in utilizing the composite materials to improve the hydrodynamic and structural performance of marine *** objective of this paper is to study the cavitation performance of composite propellers based on the unsteady simulation method considering the cavitation-composite structure *** typical cavitation patterns around the composite propeller are studied,which include blade sheet cavitation and tip vortex *** unsteady flow characteristics of tip vortex cavitation and structural dynamic response of composite propeller are studied,and the mechanism of composite propeller for the cavitation suppression and efficiency improvement is *** results show that compared with rigid propellers,composite propellers have smaller cavity volume and higher propulsion efficiency under the same *** unsteady cavitating flow characteristics under non-uniform wake are periodic,and the phase lag of hydrodynamic coefficients of composite propeller can be observed compared with that of the rigid *** bending-torsional coupling deformation of the composite propeller makes the pressure pulsation of the flow field gentler,which reduces the influence of the cavitation load on the composite propeller.

关键词： Composite propeller unsteady cavitation hydrodynamic characteristics fluid-structure interaction(FSI)

种植密度和行距对膜下滴灌红花生长发育及产量的影响

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

新疆农业科学 2024年第4期61卷 804-813页

作者：宋贤明侯献飞顾元国苗昊翠李强郭美丽曾幼玲贾东海新疆大学生命科学与技术学院乌鲁木齐830017 新疆农业科学院经济作物研究所乌鲁木齐830091 海军军医大学药学系上海200433

【目的】研究不同种植密度和行距对膜下滴灌红花生长发育和产量的影响,为构建红花高光效种植模式提供参考。【方法】2020~2021年在新疆塔城地区裕民县设置田间试验,采用两因素随机区组设计,种植密度设4个处理:1.0×10^(4)株/667m^(2)(A_... 详细信息

【目的】研究不同种植密度和行距对膜下滴灌红花生长发育和产量的影响,为构建红花高光效种植模式提供参考。【方法】2020~2021年在新疆塔城地区裕民县设置田间试验,采用两因素随机区组设计,种植密度设4个处理:1.0×10^(4)株/667m^(2)(A_(1))、1.5×10^(4)株/667m^(2)(A_(2))、2.0×10^(4)株/667m^(2)(A_(3))和2.5×10^(4)株/667m^(2)(A_(4)),行距设2个处理:20 cm(B_(1))和30 cm(B_(2)),分析不同种植密度和行距对膜下滴灌红花农艺性状、干物质积累和产量的影响。【结果】在一定种植密度范围内,红花株高、叶绿素含量、干物质积累量、产量等指标均随种植密度的增加而逐渐增加,单株果球数、每果粒数和千粒重则随着种植密度的增加而降低,而不同行距则对红花的各指标影响较小。A_(3) B_(1)和A_(3) B_(2)处理下红花的综合指标和产量均显著优于其他处理,A_(3)处理下花丝产量分别比A_(1)、A_(2)和A_(4)处理增加了15.73%、11.23%和7.97%,籽粒产量分别比A_(1)、A_(2)和A_(4)处理增加了18.75%、11.96%和14.50%。【结论】种植密度(2.0×10^(4)株/667m^(2)(A_(3)),20 cm(B_(1))或30 cm(B_(2)),等行距)为红花高产高效的栽培模式,能协调红花生长,显著提高红花花丝和籽粒产量。

关键词：红花种植密度行距干物质积累生长产量

Origin of high mechanical quality factor in CuO-doped （K, Na）NbO3-based ceramics

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2014年第2期8卷 165-175页

作者： Wen-Feng LIANG Ding-Quan XIAO Jia-Gang wu Wen-Juan wu Jian-guo ZHU Department of Materials Science Sichuan University Chengdu 610064 China CAEP Key Laboratory of Neutron Physics Mianyang 621900 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China

The origin of a high mechanical quality in CuO-doped （K, Na）NbO3-based ceramics is addressed by considering the correlations between the lattice positions of Cu ions and the hardening effect in K0.48Na0.52＋xNbO3-0.01CuO ceramics. The Cu ions simultaneously occupy K/Na and Nb sites of these ceramics with x = 0 and 0.02, only occupy the K/Na site of the ceramics with x= -0.02, and mostly form a secondary phase of the ceramics with x = -0.05. The Cu ions lead to the hardening of ceramics with an increase of Ec and Qm by only occupying the K/Na site, together with the formation of double hysteresis loops in un-poled compositions. A defect model is proposed to illuminate the origin of a high Qm value, that is, the domain stabilization is dominated by the content of relatively mobile O2- ions in the ceramics, which has a weak bonding with CUK/Na defects.

关键词： lead-free piezoelectric ceramic (K, Na)NbO3 (KNN) mechanism of hard-ening effect mechanical quality factor Qm domain stabilization

准东吉南凹陷二叠系芦草沟组烃源岩有机质富集机制

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

天然气地球科学 2024年第9期35卷 1574-1589页

作者：张妍吴欣松康积伦高岗黄志龙樊柯廷李杰马强张伟中国石油大学(北京)地球科学学院北京102249 中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油吐哈油田分公司勘探开发研究院新疆哈密839009

准噶尔盆地东部(准东)吉南凹陷发育大套二叠系芦草沟组烃源岩,但其芦草沟组烃源岩沉积古环境与有机质富集机理尚不明确。通过总有机碳、岩石热解、主微量元素和饱和烃色谱/质谱等分析手段,对研究区芦草沟组烃源岩沉积古环境、古生产力... 详细信息

准噶尔盆地东部(准东)吉南凹陷发育大套二叠系芦草沟组烃源岩,但其芦草沟组烃源岩沉积古环境与有机质富集机理尚不明确。通过总有机碳、岩石热解、主微量元素和饱和烃色谱/质谱等分析手段,对研究区芦草沟组烃源岩沉积古环境、古生产力进行了研究,以此探讨芦草沟组烃源岩有机质富集机理。结果表明:①通过总有机碳和岩石热解参数分析认为吉南凹陷二叠系芦草沟组有机质丰度普遍达到极好,有机质类型以Ⅰ型、Ⅱ1型为主,整体处于低熟—成熟阶段,生烃潜力高。②生物标志物参数分析表明,芦草沟组有机质主要为水生生物和陆源高等植物混合贡献,且芦二段具有更高的陆源有机质输入。③根据主微量元素结合生物标志物相关参数,认为研究区芦一段烃源岩沉积于干旱、半咸水、弱还原的浅水—半深水环境,古生产力较低;芦二段烃源岩沉积于湿润—半干旱、淡水、弱还原—弱氧化的浅水沉积环境,古生产力中等。④根据研究区芦草沟组烃源岩有机质丰度与不同古沉积环境条件的综合研究分析认为,芦一段有机质的富集主要受水生生物的繁盛和保存条件控制;芦二段初始生产力主导了有机质的富集。

关键词：生物标志物有机质富集沉积环境芦草沟组吉南凹陷