检索结果-南通市图书馆

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

某混输海底管道内腐蚀原因分析

化工装备技术 2024年第2期45卷 57-61页

作者：成绍平中海石油(中国)有限公司湛江分公司

某平台海底混输管道于2009年建成后一直处于封存备用状态,于2017年投产使用,在2019年内检测时发现大量腐蚀点。为了有效控制管道的腐蚀程度,从该海底管道的运行工况、内检测情况、腐蚀监检测情况以及水质结垢趋势等方面对管道内腐蚀原... 详细信息

某平台海底混输管道于2009年建成后一直处于封存备用状态,于2017年投产使用,在2019年内检测时发现大量腐蚀点。为了有效控制管道的腐蚀程度,从该海底管道的运行工况、内检测情况、腐蚀监检测情况以及水质结垢趋势等方面对管道内腐蚀原因进行了分析。该海管在封存期间海管中残留海水引发了溶解氧腐蚀以及运行期间由于聚合物、固体杂质以及水质结垢所引起的的沉积物下(或垢下)腐蚀共同作用导致腐蚀。

关键词：混输海管内腐蚀腐蚀原因

双拉盖尔-高斯腔光力系统中的腔内压缩冷却研究

在线全文

学校读者我要写书评

暂无评论

光学学报 2024年第3期44卷 271-279页

作者：廖庆洪邱海燕程绍平朱泓宇曾永强南昌大学信息工程学院电子信息工程系江西南昌330031

机械振子的冷却是腔光力学研究的重要方向之一。计算光力噪声谱和稳态的最终声子数,对基于耦合光学参量放大器(OPA)的双拉盖尔-高斯腔光力系统中的腔内压缩冷却问题进行研究。在弱耦合条件下,利用微扰近似理论方法得出系统的光力噪声谱... 详细信息

机械振子的冷却是腔光力学研究的重要方向之一。计算光力噪声谱和稳态的最终声子数,对基于耦合光学参量放大器(OPA)的双拉盖尔-高斯腔光力系统中的腔内压缩冷却问题进行研究。在弱耦合条件下,利用微扰近似理论方法得出系统的光力噪声谱,基于费米黄金法则的理论计算出稳态下的最终声子数的解析表达式。利用入射泵浦光驱动腔场内耦合的OPA,使腔场内形成强烈的非线性压缩效应,量子反作用加热过程得到有效抑制,系统净冷却率得到显著提高。此外,讨论了其他系统参数对机械振子冷却的影响。最后研究了系统的稳态声子数,声子数可以在较大参数范围内小于1。该方案能有效地降低机械振子的冷却极限。

关键词：量子光学双拉盖尔-高斯腔基态冷却腔内压缩光力噪声谱

Diverse foraging strategies of breeding Swinhoe's Storm-petrel in the productive marginal sea of the Northwest Pacific

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第1期15卷 27-34页

作者： Yachang cheng Lei Zhu Lin Xue Shisheng Ma Nan Jia shaoping Zang Zhihai Cao Jing Yuan Yang Liu State Key Laboratory of Biocontrol School of EcologySun Yat-sen UniversityShenzhen 518107China Guangxi Mangrove Research Center Guangxi Marine Academy of SciencesNanning 530021China Qingdao Bird Watch Society Qingdao 266121China Jiangsu Provincial Environmental Monitoring Center Nanjing 210019China Marine Science and Engineering Qingdao Agricultural UniversityQingdao 266109China Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering Fudan UniversityShanghai 200433China Qingdao Marine Management and Support Centre Qingdao 266555China Management Committee of Lingshan Island Provincial Nature Reserve Qingdao 266428China

Understanding the foraging behavior is essential for investigating seabird ecology and conservation,as well as monitoring the well-being of the marine *** seabirds adopt diverse foraging strategies to maximize energy gains and cope with the intensified challenges of parenting and *** tradeoff may stem from the heterogeneity of food resources and the constraints of central place ***,abundant marine productivity could alleviate the energy limitation for seabirds,resulting in a consistent foraging ***,we investigated the foraging strategy during the breeding season of a cryptic small-sized seabird,Swinhoe’s Storm-petrel(Hydrobates monorhis),in the Yellow Sea,a productive marginal sea of the Northwest *** GPS tracking,we evaluated habitat preference,quantified the foraging strategy,and tested if environmental conditions and individual traits influence foraging *** found that Swinhoe’s Storm-petrels preferred nearshore areas with shallow water and engaged in primarily short foraging *** southeastward and southwestward strategies emerged when combining trip metrics,including foraging direction,duration,and maximum *** bathymetry,proximity to the coastline,and sea surface temperature differed in two foraging *** strategies exhibited flexibility between individuals,potentially explained by wing morphology,in which longer-winged birds are more likely to embark on longer-distance foraging *** findings highlight the impact of environmental factors and individual traits on seabirds’foraging decisions in productive marginal sea *** study also provides valuable insights into the foraging ecology of this Asian endemic storm-petrel.

关键词： Behavioral strategy Biologging Central place foraging Marine primary productivity Seabird Sea surface temperature

Accordant Summit Levels (ASLs) and Their Tectonic Deformation in the Denudational Areas of the North China Rift Zone

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 1995年第3期9卷 133-144页

作者： cheng shaoping and Yang GuizhiInstitute of Geology,SSB,Beijing 100029 China

The North China rift zone,including the North China Plain rift zone and the middle Shanxi graben-rift zone,is a continental rift;geomorphologically,its most common and important characteristics are the multiple accordant summit levels (ASLs) in the denudational *** this study three methods based on geomorphic analysis,that is,(1) unified topographic profiles,(2) cyclic knickpoints along longitudinal river profiles,and (3) depth contours of river downcutting,are used to identify the ASLs and analyze their tectonic *** formation time of the ASLs is determined by geological and geomorphological evidence,the correlation with the sedimentary facies in the Plain rift zone,and K-Ar ages of basalts on the ASLs,indicating the rates of tectonic *** North China rift zone has five ASLs,of which the highest and oldest ASL I is the remnant of a fossil peneplain formed before rifting and the other four lower and younger ones are pediplain-typed formed contemporaneously with *** of

关键词： North China Continental rift Planation surface

Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第1期35卷 212-220页

作者： Wenfei Gong Aiguo Ruan Xiongwei Niu Zhenjie Wang Pingchuan Tan Xiaodong Wei Wei Wang Zhengyi Tong Liqun cheng Fansheng Kong shaoping Lu Jianke Fan Weiwei Ding Jinyao Gao Chunguo Yang Jiabiao Li School of Oceanography Shanghai Jiaotong UniversityShanghai 200240China Key Laboratory of submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Zhejiang Earthquake Administration Hangzhou 310013China School of Earth Sciences Zhejiang UniversityHangzhou 310027China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China School of Earth Sciences and Engineering Sun Yat-sen UniversityZhuhai 519082China Institute of Oceanology Chinese Academy of SciencesQingdao 266071China

On September 5,2019,a moderate earthquake of Mw5.4 unexpectedly occurred in the apparently quiescent central basin of the South China *** immediately carried out a seismicity monitoring experiment around the epicenter by using broadband ocean bottom seismometers(OBS)for the following three scientific *** first is knowing the earthquake seismogenic mechanism,fault structure and further *** second is finding the role of the residual spreading ridge playing in earthquake processes and further revealing the deep structures of the ridge directional turning *** third is confirming the existence and significance of the so called“Zhongnan fault”.This paper reports the preliminary results of the first phase *** OBSs were deployed for seismicity monitoring with a duration of 288 days,but only three were ***-earthquakes were firstly detected by an automatic seismic phase picking algorithm and then were verified by analyzing their seismic phases and time-frequency characteristics in detail.A total of 21,68 and 89 microearthquakes were picked out from the three OBSs respectively within the distance of 30 *** dominant frequency of these micro-earthquakes is 12-15 Hz,indicating tectonic *** the first two months after the mainshock the seismicity was relatively stronger,and micro-earthquakes were still occurring occasionally till the end of observation,indicating the epicenter area is *** used Match&Locate method to locate 57 micro-earthquakes *** spatial distribution shows that the seismicity is developed mainly along the NE direction roughly parallel to the residual ridge with depth variations between 10-20 km.

关键词： South China Sea microseismic monitoring earthquakes fault broadband OBS

Finite volume method for investigating anisotropic conductivity in EEG

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2002年第2期 58-62页

作者： XIE Yaoqin, MA Xinshan , GUAN Xin, and cheng shaoping( Department of Electrical Engineering, Tsinghua University, Beijing 100084, China Naval Chief Hospital, Beijing, 100037, China) Department of Electrical Engineering Tsinghua University Beijing 100084 China Naval Chief Hospital Beijing 100037 China

A novel finite volume method is presented to investigate the effect of anisotropic conductivity on the potential distribution of the scalp. The second-order interpolation of the tetrahedral mesh is used to avoid employing the secondary element. The calculation precision is enhanced by using the Gaussian integration. To avoid the geometric singularity, the triangular prism is employed in place of the conventional hexahedron mesh. With the method, the spherical models as well as the realistic head models are simulated. The calculation results indicate that the anisotropic ratio and the position of dipole sources have great influence on the potential distribution in the electroencephalogram.

关键词： finite volume method anisotropy electroencephalogram.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

内蒙古大青山的新生代剥蚀和隆起

地震地质 2000年第1期22卷 27-36页

作者：程绍平邓起东杨桂枝任殿卫中国地震局地质研究所北京100029

内蒙古大青山及其毗邻的呼和浩特断陷盆地是研究剥蚀和地壳均衡隆起的理想地区。本文提供了大青山新生代等高峰顶面和晚第四纪河流阶地拱曲变形的证据 ;依据呼和浩特盆地的地震探测获得的沉积厚度 ,计算出大青山的剥蚀和地壳均衡隆起量 ... 详细信息

内蒙古大青山及其毗邻的呼和浩特断陷盆地是研究剥蚀和地壳均衡隆起的理想地区。本文提供了大青山新生代等高峰顶面和晚第四纪河流阶地拱曲变形的证据 ;依据呼和浩特盆地的地震探测获得的沉积厚度 ,计算出大青山的剥蚀和地壳均衡隆起量 ;提出地壳均衡隆起是大青山晚第三纪以来主要的区域变形机制 ;指出由於地壳均衡隆起 ,剥蚀作用最终只是使大青山高度略微降低 ;同时复原了大青山新生代景观演化历史。本文还讨论了剥蚀和地壳均衡隆起之间的耦合关系以及断裂作用在其中的地位 ,认为大青山新生代景观演化是在剥蚀去荷失去重力平衡和均衡隆起恢复重力平衡的长期自身耦合作用中进行的 ,在此过程中断层的下降盘由主动盘变成被动盘。

关键词：内蒙古大青山断陷盆地剥蚀地壳均衡隆起

Functional genomics of Brassica napus:Progresses,challenges,and perspectives

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第3期66卷 484-509页

作者： Zengdong Tan Xu Han cheng Dai shaoping Lu Hanzi He Xuan Yao Peng Chen Chao Yang Lun Zhao Qing-Yong Yang Jun Zou Jing Wen Dengfeng Hong Chao Liu Xianhong Ge Chuchuan Fan Bing Yi Chunyu Zhang Chaozhi Ma Kede Liu Jinxiong Shen Jinxing Tu Guangsheng Yang Tingdong Fu Liang Guo Hu Zhao National Key Laboratory of Crop Genetic Improvement Hubei Hongshan LaboratoryHuazhong Agricultural UniversityWuhan 430070China Yazhouwan National Laboratory Sanya 572025China

Brassica napus,commonly known as rapeseed or canola,is a major oil crop contributing over 13%to the stable supply of edible vegetable oil *** and understanding the gene functions in the *** genome is crucial for genomic breeding.A group of genes controlling agronomic traits have been successfully cloned through functional genomics studies in *** this review,we present an overview of the progress made in the functional genomics of ***,including the availability of germplasm resources,omics databases and cloned functional *** on the current progress,we also highlight the main challenges and perspectives in this *** advances in the functional genomics of *** contribute to a better understanding of the genetic basis underlying the complex agronomic traits in *** and will expedite the breeding of high quality,high resistance and high yield in *** varieties.

关键词： accelerate breeding Brassica napus functional genomics high resistance high yield

基于内外混合图像先验与图像融合的DIP改进降噪模型

在线全文

学校读者我要写书评

暂无评论

电子与信息学报 2024年第1期46卷 299-307页

作者：徐少平陈晓军罗洁程晓慧肖楠南昌大学数学与计算机学院南昌330031 南昌大学附属感染病医院南昌330006

为提高无监督深度图像先验(DIP)降噪模型的降噪性能,该文提出了一种基于内外混合图像先验与图像融合的DIP改进降噪模型(IDIP),该模型由样本生成和样本融合两个相继执行的模块组成。在样本生成阶段,首先利用2个分别来自内部和外部先验且... 详细信息

为提高无监督深度图像先验(DIP)降噪模型的降噪性能,该文提出了一种基于内外混合图像先验与图像融合的DIP改进降噪模型(IDIP),该模型由样本生成和样本融合两个相继执行的模块组成。在样本生成阶段,首先利用2个分别来自内部和外部先验且有代表性的降噪算法(模型)处理噪声图像以产生2张初始降噪图像。基于这2张初始降噪图像,使用空间随机混合器按照各自50%混合比例随机生成足够多的混合图像作为DIP降噪模型的第2目标图像并与第1目标图像(即噪声图像)构成双目标图像。然后,每次使用不同的随机输入和双目标图像,多次执行标准DIP降噪流程生成多张具有互补性的样本图像;在样本融合阶段,首先为了获得更好的随机性和稳定性,随机丢弃50%的样本图像。然后,采用无监督融合网络在样本图像上完成自适应融合,获得的融合图像的图像质量相对参与融合的样本图像得到再次提升,作为最终降噪图像。在人工合成噪声图像上实验表明:IDIP降噪模型较原DIP降噪模型在峰值信噪比评价指标上有约2 dB的提升,且较大幅度超过了其他无监督降噪模型,逼近了有监督降噪模型。而在实际真实噪声图像上,其降噪性能较各对比方法更具鲁棒性。

关键词：图像降噪深度图像先验性能提升内外图像先验无监督融合