检索结果-南通市图书馆

An Analysis of Targeted Serum Lipidomics in Patients with Pneumoconiosis—China,2022

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2023年第38期5卷 849-855,I0005页

作者： Wenrong wang Fangda Peng chunguang Ding Tao Li Huanqiang wang National Institute of Occupational Health and Poison Control Chinese Center for Disease Control and PreventionBeijingChina National Center for Occupational Safety and Health BeijingChina National Key Laboratory for Engineering Control of Dust Hazard BeijingChina.

Introduction:Pneumoconiosis emerges as the most critical and prevalent occupational disease in China at present,according to research.Studies indicate that pneumoconiosis may indeed impact the body’s phospholipid metabolism.Methods:In this study,serum samples were taken from 46 paired participants,which included patients with pneumoconiosis and dust-exposed workers.We employed ultra-performance liquid chromatographytandem mass spectrometry(UPLC-MS/MS)technology in targeted lipidomics to investigate serum target phospholipids.Initially,a pilot study was conducted with a selection of 24 pneumoconiosis patients and 24 dust-exposed workers,using both univariate and multivariate statistical analyses to preliminarily identify significant differences in phospholipids.Subsequent to this,the remaining subjects were engaged in a validation study,wherein receiver operating characteristic(ROC)analysis was performed to further substantiate the screening potency of potential lipid biomarkers for pneumoconiosis.Results:The pilot study revealed significantly reduced serum levels of 16∶0 lysophosphatidylcholines(Lyso PC),18∶0–18∶1 phosphatidylglycerol(PG),18∶0–18∶1 phosphatidylethanolamine(PE),18∶0 PE,and 18∶1 lysophosphatidylethanolamine(Lyso PE)in the case group in comparison to the control group.Additionally,18∶0 PE,18∶0–18∶1 PE,and 18∶1 Lyso PE emerged as significant phospholipids with superior diagnostic values[area under the curve(AUC)>0.7].A diagnostic model was established,built on 16∶0 PC and 18∶0 PE(AUC>0.8).In the ROC analyses of validation studies,the 18∶0–18∶1 PE and this diagnostic model demonstrated excellent screening efficiency(AUC>0.7).Discussion:A significant divergence in phospholipid metabolism has been observed between pneumoconiosis patients and dust-exposed workers.The 18∶0–18∶1 PE present in serum could potentially function as a lipid biomarker for pneumoconiosis.Additionally,diagnostic models were developed relying on 16∶0 PC and 18∶0 PE,proving to have superior screening efficiency.

关键词： Lipid metabolism Serum

基于“先无功–后有功”功率补偿的配电网电压协同控制策略

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

工程科学与技术 2024年第2期56卷 26-36页

作者：贺春光王涛杨书强张菁安佳坤郭伟范文弈赵杰王辉窦春霞国网河北省电力有限公司经济技术研究院河北石家庄050011 国网河北省电力有限公司石家庄供电分公司河北石家庄050011 南京邮电大学碳中和先进技术研究院江苏南京210023 南京邮电大学自动化学院人工智能学院江苏南京210023

整县分布式光伏电源的大量开发与利用及分布式电源规模化并网对实现“碳达峰、碳中和”与“乡村振兴”两大国家战略具有重要的现实意义。由于分布式电源发电尖峰和低谷阶段与负荷峰谷时常不同步,进而导致配电系统过/欠电压问题,严重影... 详细信息

整县分布式光伏电源的大量开发与利用及分布式电源规模化并网对实现“碳达峰、碳中和”与“乡村振兴”两大国家战略具有重要的现实意义。由于分布式电源发电尖峰和低谷阶段与负荷峰谷时常不同步,进而导致配电系统过/欠电压问题,严重影响了电能质量,甚至威胁系统安全。针对上述问题,本文提出一种基于“先无功–后有功”功率补偿的配电网层级式电压协同控制策略。首先,建立基于“先无功–后有功”功率补偿的配电网层级式电压协同控制框架。其次,结合多微电网节点注入电流与电压的方程与功率–电压灵敏度分析,根据多节点电压越限程度,提出一种基于“先无功–后有功”功率补偿的多智能体协同调节策略,该策略先通过无功补偿器进行无功调节,当电压尚未得到有效治理时,再采用多微电网进行有功调节。再次,为了进一步满足各节点微电网有功功率调节需求,并考虑电网内部源–荷–储运行成本与污染排放,提出一种基于多目标优化的微电网内部分布式源–荷–储优化协调功率控制策略。最后,在MATLAB平台中设计了3种仿真场景以及IEEE测试系统模型对所提控制策略进行了验证。结果表明,所提出的电压协同控制方法在最经济的情况下可以实现各节点电压的综合高效治理,同时,所提出的微电网优化协调功率控制策略能使源–荷–储在绿色经济的供电模式下实时精准地满足电压治理目标下微电网有功调节的需求。仿真实验结果验证了本文所提控制策略的有效性。

关键词：配电网 “先无功-后有功”功率补偿电压协同控制源-荷-储协调控制

基于声信号的机械设备故障检测研究现状及进展

在线全文

学校读者我要写书评

暂无评论

机床与液压 2024年第7期52卷 183-191,200页

作者：李亚男王春光宗哲英王帅王祯杜英杰内蒙古农业大学机电工程学院内蒙古自治区呼和浩特010018

我国工业呈现规模化、复杂化和集成化的趋势,其中机械设备的长期、稳定、高效运行是工业快速发展的关键。机械设备长期工作容易出现故障导致突然停机,降低工厂的经济效益,甚至对人的生命安全造成威胁,所以机械设备故障检测对于我国工业... 详细信息

我国工业呈现规模化、复杂化和集成化的趋势,其中机械设备的长期、稳定、高效运行是工业快速发展的关键。机械设备长期工作容易出现故障导致突然停机,降低工厂的经济效益,甚至对人的生命安全造成威胁,所以机械设备故障检测对于我国工业的发展和经济效益的提高有着重要的意义。现阶段的常见故障检测方式主要是人工检测和振动监测,人工检测巡检周期长、不能及时发现故障、主观性强,振动检测对检测装备的安装要求较高。因为机械设备发生损坏时声音会发生改变,并且声信号的采集方式为非接触式,方便安装,所以声信号逐渐被应用于机械设备的故障检测领域。基于声信号的故障检测技术能及时发现机械设备的故障,及时维修,降低经济损失。从机器学习和深度学习两个方面综述了机械设备故障检测领域的国内外研究进展,并且提出了基于声信号的机械设备故障检测技术未来的研究重点和参考方向,旨在为机械设备的故障诊断提供参考。

关键词：声信号故障检测机器学习深度学习综述

在线全文

学校读者我要写书评

暂无评论

分离罐油水多界面监测系统设计

仪器仪表标准化与计量 2024年第1期 31-34页

作者：徐兴王春光中国石油化工集团有限公司生产经营管理部北京市100728 中国石油化工股份有限公司胜利油田分公司技术检测中心东营市257000

原油开采过程中分离罐液位检测手段主要靠人工完成,存在低效率及安全隐患等问题。本文利用基于射频导纳原理的多点测控技术,研制出新型分离罐罐油水多界面及含水率测量装置,实现对油田分离罐内的油水界面进行在线监测。

关键词：射频导纳原油分离罐油水界面

基于S7-200Smart的联合站原油盘库系统设计

在线全文

学校读者我要写书评

暂无评论

仪器仪表标准化与计量 2024年第2期 14-17页

作者：徐兴王春光中国石油化工集团有限公司生产经营管理部北京市100728 中国石油化工股份有限公司胜利油田分公司技术检测中心东营市257000

在石油生产过程中,联合站具有油气水分离、原油脱水、油水外输等重要功能,是油田原油集输和处理的中枢。联合站内原油沉降罐中油水界面及液位的准确测量对于油田的稳定运行和实时计量有着重要的作用。针对目前原油盘库系统存在的不足,... 详细信息

在石油生产过程中,联合站具有油气水分离、原油脱水、油水外输等重要功能,是油田原油集输和处理的中枢。联合站内原油沉降罐中油水界面及液位的准确测量对于油田的稳定运行和实时计量有着重要的作用。针对目前原油盘库系统存在的不足,本文提出了一种通过大罐多相剖面仪对介质阻抗进行逐点测量实现罐内液位监控的测量方法,提高液位及油水界面的测量精度和实时性,对油田联合站智能化建设具有重要意义。

关键词：阻抗测量原油沉降罐盘库系统油水界面 S7-200Smart

在线全文

学校读者我要写书评

暂无评论

粘性流动自动化CFD计算技术研究进展

空天技术 2024年第2期 39-53页

作者：陈洁王家森卢俊宇刘君徐春光大连理工大学航空航天学院大连116024 中山大学航空航天学院广州510275 宁波大学机械工程与力学学院宁波315211

针对Euler方程的自动化求解,目前国内外已有成熟的CFD商业软件,譬如Cart3D、KARALIT CFD、Pi-Flow等,但对于NS方程的自动化CFD计算,仍存在很多技术难题,尚处于起步阶段。在文献调研的基础上,总结了基于笛卡尔网格的自动化CFD软件功能与... 详细信息

针对Euler方程的自动化求解,目前国内外已有成熟的CFD商业软件,譬如Cart3D、KARALIT CFD、Pi-Flow等,但对于NS方程的自动化CFD计算,仍存在很多技术难题,尚处于起步阶段。在文献调研的基础上,总结了基于笛卡尔网格的自动化CFD软件功能与技术特点,介绍了笛卡尔网格下物面边界处理方法和粘性流动模拟技术的研究进展。在分析上述技术路线不足的基础上,基于团队研究成果提出了一种适用于粘性流动自动化CFD计算的新框架,并介绍了其涉及的关键技术。数值试验表明,提出的新框架具备自动化求解粘性流动的工程应用前景。

关键词：自动化CFD 笛卡尔网格浸入边界法切割单元法有限差分法

在线全文

学校读者我要写书评

暂无评论

基于图论的两相渗流排序求解并行算法研究

力学季刊 2024年第1期45卷 88-98页

作者：张伟峰李春光肖昌昊王晓宏中国科学技术大学热科学和能源工程系安徽合肥230026 中国石化胜利油田分公司科技管理部山东东营257015

对于两相渗流顺序求解格式中的饱和度计算,采用排序的方法可以将离散的全局非线性系统分解为一系列局部非线性系统来加速非线性求解过程.运用图论中的广度优先算法(BreadthFirstAlgorithm,BFS)和深度优先搜索(DepthFirst Search,DFS)来... 详细信息

对于两相渗流顺序求解格式中的饱和度计算,采用排序的方法可以将离散的全局非线性系统分解为一系列局部非线性系统来加速非线性求解过程.运用图论中的广度优先算法(BreadthFirstAlgorithm,BFS)和深度优先搜索(DepthFirst Search,DFS)来实现饱和度的并行计算。在两相流动方向一致时,基于BFS,使得同时参与计算的网格划分为一组,组与组之间满足拓扑排序的要求.在考虑重力和毛管力引起的两相流动方向不一致情况下,根据势能大小建立关于网格的有向有环图(DirectedCyclicGraph,DCG),利用强连通分量搜索的Tarjan算法找出耦合的网格,将耦合的网格视为一个网格并重新建图,从而得到有向无环图(Directed AcyclicGraph,DAG).最终实现饱和度排序求解的并行化.

关键词：两相流并行计算图论顺序求解格式广度优先 Tarjan算法

Radial Permeability Measurements for Shale Using Variable Pressure Gradients

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2020年第2期94卷 269-279页

作者： FAN Kunkun SUN Renyuan DEREK ELS WORTH DONG Mingzhe LI Yajun YIN Congbin LI Yanchao CHEN Zhongwei wang chunguang State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266555China College of Energy and Mining Engineering.Shandong University of Science and Techology.Qingdao 266555 China College of Petroleum Engineering Chinese University of PetroleumQingdao 266555ShandongChina Energy and Mineral Engineering Pennsylvania State University PA 16X01USA Department of Chemical and Petroleum Engineering University of CalgaryAB T2NIN4Canada Downhole Service Company.Chuanqing Drilling Company CNPCChengdu 610051SichuanChina School of Mechanical and Mining Engineering The University of QueenslandQLD 4074Australia

Shale gas is becoming an important component of the global energy supply, with permeability a critical controlling factor for long-term gas production. Obvious deviation may exist between helium permeability determined using small pressure gradient(SPG) methods and methane permeability obtained under actual field production with variable pressure gradients(VPG). In order to more accurately evaluate the matrix permeability of shale, a VPG method using real gas(rather than He) is established to render permeability measurements that are more representative of reservoir conditions and hence response. Dynamic methane production experiments were performed to measure permeability using the annular space in the shale cores. For each production stage, boundary pressure is maintained at a constant and the gas production with time is measured on the basis of volume change history in the measuring pump. A mathematical model explicitly accommodating gas desorption uses pseudo-pressure and pseudo-time to accommodate the effects of variations in pressuredependent PVT parameters. Analytical and semi-analytical solutions to the model are obtained and discussed. These provide a convenient approach to estimate radial permeability in the core by nonlinear fitting to match the semi-analytical solution with the recorded gas production data. Results indicate that the radial permeability of the shale determined using methane is in the range of 1×10-6– 1×10-5 mD and decreases with a decrease in average pore pressure. This is contrary to the observed change in permeability estimated using helium. Bedding geometry has a significant influence on shale permeability with permeability in parallel bedding orientation larger than that in perpendicular bedding orientation. The superiority of the VPG method is confirmed by comparing permeability test results obtained from both VPG and SPG methods. Although several assumptions are used, the results obtained from the VPG method with reservoir gas are much closer to reality and may be directly used f

关键词： shale radial permeability variable pressure gradients pseudo pressure pseudo time

Systematics, species diversity and new taxa of mesozooplankton in the West Pacific Ocean and its marginal seas: a brief compilation of monographs in China

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2018年第10期37卷 229-242页

作者： wang Yu HUANG Zongguo wang chunguang HUANG Jiangshiou LIU Zhensheng XU Zhenzu HUANG Jiaqi CHEN Ruixiang LIAN Guangshan DAI Yanyu LIN Jinghong LIN Mao Laboratory of Marine Biology and Ecology Third Institute of OceanographyState Oceanic Administration Institute of Marine Biology National Taiwan Ocean University Second Institute of Oceanography State Oceanic Administration College of Ocean and Earth Sciences Xiamen University

Research and protection of biodiversity is generally started with species recognizing guided by achievement of cataloguing and illustration obtained through in situ investigation data accumulation and literature learning. Facing the shortage of taxonomist, it is getting harder to maintain important specimen collections and handle loans. The West Pacific Ocean has been operating as a center of the origin of global marine biodiversity result of the richest species diversity of marine taxa found in these waters. The present work is a compilation and summary of systematics, species diversity and new taxa of mesozooplankton major group known in West Pacific Ocean and its marginal seas （0°-45°N, 105°-152°E） according to 6 203 mesozooplankton samples acquired from 701 stations during 1965 and 2008. A total of 2 657 species belonging to 686 genera and 206 families of 10 mesozooplankton groups have been found through taxonomic identification and document consulting. In details, 697 species from 251 genera of 99 families belong to the Medusozoa, 59 species from 22 genera of 12 families to the Ctenophora, 85 species from 36 genera of 14 families to the pelagic Mollusca （Pteropoda and Heteropoda）, 416 species from 91 genera of 8 families to the Ostracoda, 908 species from 156 genera of 51 families to the Copepoda, 202 species from 60 genera of 4 families to the Mysidacea, 56 species from 8 genera of 2 families to the Euphausiacea, 105 species from 23 genera of 8 families to the Decapoda, 48 species from 13 genera of 5 families to the Chaetognatha and 81 species from 26 genera of 5 families to the Tunicata. The dominant species of each group are enumerated. Moreover, 2 new species of Medusozoa, Tubulariidae, Ectopleura, 1 new species of Medusozoa, Protiaridae, Halitiarella, 1 new genus and 1 new species of Medusozoa, Corymorphidae are established. An amount of 806 species are expanded with an increase of 43.5% on the basis of 1 852 species recorded before 2008, including 1.4% increase from tropical sea around equator, 4.0% fr

关键词： marine mesozooplankton systematics species diversity new taxa compilation the West Pacific Ocean marginal sea