检索结果-南通市图书馆

Erosion behavior of a ship propeller material of QAl9-4 alloy

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第7期42卷 2390-2395页

作者： Wei-Jiu Huang Yong-Tao Zhou Zhen-Guo Wang Zhi-kang liao School of Materials Science and Engineering Chongqing University of TechnologyChongqing400054China School of Materials Science and Engineering Beihang UniversityBeijing100191China

The erosion behavior of a QA19-4 alloy as a ship propeller material was *** effects of the solution,the impact angles and the sand content were *** test results demonstrate that the mass loss of the alloy in 3.5 wt%NaCl solution is 1.35 times that in tap water,due to the corrosive effect of Cl^(-).The mass loss of the alloy increases as the impact angle increases up to~30°and consequently decreases as the impact angle ***,this feature is typical for the ductile metal *** the impact angle of 0°,this feature is associated with the predominant erosion mechanisms,such as shallow plowing and surface fatigue;at 30°,this feature is micro-cutting,deep plowing and surface fatigue;and at 45°,it becomes indentation accompanied by extruded *** mass loss and surface roughness of the alloy increase as the sand content increases under the testing conditions.

关键词： Erosion QAl9-4 alloy Impact angle Sand content Erode surface

Initiation and Kinematic Process of Debris Flow with the Existence of Terraced Fields at the Sources

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年第5期35卷 1613-1625页

作者： Liang Yang Yang Wang kang liao Longfei Zhang Aiyun Chen Juan Du Faculty of Engineering China University of GeosciencesWuhan 430074China China Railway Siyuan Survey and Design Group Co. LTD.Wuhan 430063China

A debris flow,with terraced fields as the source area,broke out on June 25th,2018 in the Xiaotuga area of Yunnan Province,China,and this kind of debris flow is rarely *** purposes in this study:(1)the influence of flow drag force on slope stability;(2)back-analyze the movement process of debris ***,the geological background and movement of this debris flow were described based on a field ***,drag force,calculated by the laminar flow theory,is added to the slope stability calculation model,which elaborates the initiation process of this ***,dynamic simulation software(DAN3D)was used to simulate the kinematic process of the debris flow with a variety of combination *** study shows that the terrace area can quickly produce surface runoff and create a drag force under rainfall conditions,which is the essential reason for the initiation of debris *** addition,the use of the FVV(Frictional-Voellmy-Voellmy)model is found to provide the best performance in simulating this type of debris flow,which reveals that it lasts approximately 200 s and that the maximum velocity is 12 m/s.

关键词： debris flow initiation process kinematic process terraced fields engineering geology

Efficient slope reliability analysis under soil spatial variability using maximum entropy distribution with fractional moments

在线全文

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1140-1152页

作者： Chengxin Feng Marcos A.Valdebenito Marcin Chwała kang liao Matteo Broggi Michael Beer Institute for Risk and Reliability Leibniz University HannoverCallinstr.34Hannover30167Germany Chair for Reliability Engineering TU Dortmund UniversityLeonhard-Euler-Str.5Dortmund44227Germany Faculty of Civil Engineering Wrocƚaw University of Science and TechnologyWrocƚawPoland Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu610031China University of Liverpool Institute for Risk and UncertaintyPeach StreetLiverpoolL69 7ZFUnited Kingdom International Joint Research Center for Resilient Infrastructure & International Joint Research Center for Engineering Reliability and Stochastic Mechanics Tongji UniversityShanghaiChina

Spatial variability of soil properties imposes a challenge for practical analysis and design in geotechnical *** latter is particularly true for slope stability assessment,where the effects of uncertainty are synthesized in the so-called probability of *** probability quantifies the reliability of a slope and its numerical calculation is usually quite involved from a numerical *** view of this issue,this paper proposes an approach for failure probability assessment based on Latinized partially stratified sampling and maximum entropy distribution with fractional *** spatial variability of geotechnical properties is represented by means of random fields and the Karhunen-Loève ***,failure probabilities are estimated employing maximum entropy distribution with fractional *** application of the proposed approach is examined with two examples:a case study of an undrained slope and a case study of a slope with cross-correlated random fields of strength parameters under a drained *** results show that the proposed approach has excellent accuracy and high efficiency,and it can be applied straightforwardly to similar geotechnical engineering problems.

关键词： Slope Random field Reliability analysis Maximum entropy distribution Latinized partial stratified sampling

Analysis on the Differences of the Flower Bud Differentiation Process in Different Positions of the Canopy of Luntaibaixing

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

Analysis on the Differences of the Flower Bud Differentiatio...

电信固网运营商转型中信息超市的研究及其建设

The Third Conference on Horticulture Science and Technology

作者： Liu Juan liao kang Li Yongxian Cheng Xiaolong Research Centre of Characteristic Fruit Tree Xinjiang Agriculture University

ISBN: (纸本)9781907801136

＜正＞The aim of the research is to study the differences of the flower bud differentiation process in different positions of the tree canopy of *** canopy division and paraffin section methods are used in the *** results show that the process of flower bud differentiation of Luntaibaixing is all in the Pistil differentiation stage in *** there is certain difference of the flower bud differentiation process in different positions of the tree canopy of *** process of flower bud differentiation in outer and upper is relatively faster;the process of flower bud differentiation in the west of the canopy is relatively slower;the south of the canopy is relatively faster,while the east and the north of the canopy are moderate.

关键词： apricot different position of tree canopy flower bud differentiation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

电子学报 2007年第4期35卷 716-720页

作者：廖康贵州省电信有限公司贵州贵阳550001

提出了电信固网运营企业转型的本质,是将经营重心由电信网络运营转向为用户提供个性化综合信息服务,经营领域从现有的网络接入服务拓展到对各类信息的汇聚、集成和提供.在网络转型的基础上,重建新的内容服务定价机制,最后达到重塑产业... 详细信息

提出了电信固网运营企业转型的本质,是将经营重心由电信网络运营转向为用户提供个性化综合信息服务,经营领域从现有的网络接入服务拓展到对各类信息的汇聚、集成和提供.在网络转型的基础上,重建新的内容服务定价机制,最后达到重塑产业价值链,并取得主导地位的目的.本文提出了电信信息超市的概念,给出其总体架构,阐述了全新的超市宽带平台商业模式及其建设,提出了宽带接入服务个人化的概念.电信信息超市的出现,可以建立新的经营模式,促进信息消费需求增长,带动CP(content provider)市场的极大繁荣,从而有力推动电信固网运营商转型进程.实践表明,电信信息超市的总体设计是正确的,它的提出对电信企业转型有重要的参考和借鉴价值.

关键词：电信企业转型综合信息服务信息超市宽带

Genetic diversity,population structure,and relationships of apricot(Prunus)based on restriction site-associated DNA sequencing

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2020年第1期7卷 1928-1940页

作者： Wenwen Li Liqiang Liu Yanan Wang Qiuping Zhang Guoquan Fan Shikui Zhang Yatong Wang kang liao College of Horticulture and Forestry Xinjiang Agricultural UniversityUrumqiXinjiang 830052China Xiongyue National Germplasm Resources Garden of the liaoning Institute of Pomology XiongyueShenyang 115009China Luntai National Fruit Germplasm Resources Garden of Xinjiang Academy of Agricultural Sciences LuntaiXinjiang 841600China

Single-nucleotide polymorphisms(SNPs)are the most abundant form of genomic polymorphisms and are widely used in population genetics ***,high-throughput sequencing was used to examine the genome-level diversity,population structure,and relationships of apricot,which are important for germplasm conservation and molecular *** site-associated DNA sequencing(RAD-seq)was adopted to sequence 168 Prunus *** distributed in five ecological groups,including 74 accessions of cultivated Prunus armeniaca *** 94 accessions of wild apricots(*** *** Prunus sibirica L.),which generated 417,961 high-quality *** used cluster,genetic structure,and principal component analyses to examine the genetic diversities and genetic relationships of the 168 *** Dzhungar-Ili ecological group accessions showed the highest genetic diversity in terms of private allele number,observed heterozygosity,and nucleotide *** speculate that the Central Asian ecological group accessions were domesticated from the Dzhungar-Ili ecological group *** population structure and gene flow of the North China and European ecological group accessions suggested a genetic background of *** argue that the two groups should be considered hybrid swarms connected to *** by continuous and extensive gene *** originated in Northwest China(Ili Valley),subsequently spread throughout Central Asia,and eventually spread to *** addition,selective sweep signatures in *** during domestication from wild to cultivated apricots,combined with differentially expressed genes,underlie distinct fruit traits,including sugars,aromas,organic acids,and *** study provides substantive and valuable genomic resources that will significantly advance apricot improvement and effective utilization.

关键词： Prunus cultivated structure

G protein controls stress readiness by modulating transcriptional and metabolic homeostasis in Arabidopsis thaliana and Marchantia polymorpha

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

Molecular Plant 2022年第12期15卷 1889-1907页

作者： Ting-Ying Wu Shalini Krishnamoorthi Kulaporn Boonyaves Isam Al-Darabsah Richalynn Leong Alan M.Jones Kimitsune Ishizaki kang-Ling liao Daisuke Urano Temasek Life Sciences Laboratory SingaporeSingapore Department of Mathematics University of ManitobaWinnipegMBCanada Singapore-MIT Alliance for Research and Technology SingaporeSingapore Department of Biological Sciences National University of SingaporeSingapore 117558Singapore Departments of Biology and Pharmacology University of North CarolinaChapel HillNCUSA Graduate School of Science Kobe UniversityKobeHyogo 657-8501Japan

The core G protein signaling module,which consists of Gαand extra-large Gα(XLG)subunits coupled with the Gβγdimer,is a master regulator of various stress *** this study,we compared the basal and salt stress-induced transcriptomic,metabolomic and phenotypic profiles in Gα,Gβ,and XLG-null mutants of two plant species,Arabidopsis thaliana and Marchantia polymorpha,and showed that G protein mediates the shift of transcriptional and metabolic homeostasis to stress readiness *** demonstrated that such stress readiness serves as an intrinsic protection mechanism against further stressors through enhancing the phenylpropanoid pathway and abscisic acid ***,WRKY transcription factors were identified as key intermediates of G protein-mediated homeostatic *** and mathematical model comparisons between *** and *** revealed evolutionary conservation of transcriptional and metabolic networks over land plant evolution,whereas divergence has occurred in the function of plant-specific atypical XLG *** together,our results indicate that the shifts in transcriptional and metabolic homeostasis at least partially act as the mechanisms of G protein-coupled stress responses that are conserved between two distantly related plants.

关键词： homeostatic adjustments transcriptional regulation metabolic regulation heterotrimeric G protein evolutionary conservation

Suppress sloshing impact loads with an elastic structure

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

Suppress sloshing impact loads with an elastic structure

A New Wavelength Selective Photoreceiver

第二十七届全国水动力学研讨会

作者： liao kang-ping HU Chang-hong MA Qing-wei College of Ship Building Engineering Harbin Engineering University Research Institute for Applied Mechanics Kyushu University

In rough sea conditions,free floating ships or platforms often suffer from large-amplitude *** the ships or platforms with partially-filled tank（s）,such as LNG carriers and FPSO vessels,the large-amplitude motion can result in sloshing *** impact loads induced by the sloshing can result in structural ***,it is important to reduce the sloshing impact loads for the ship or platform *** this paper,a rectangular sloshing tank with an elastic structure is *** elastic structure is used to suppress the sloshing impact *** coupled FDM-FEM method,proposed by the authors,is applied to analyzed the influence of the elastic structure motion on the impact *** the coupled FDM-FEM method,the Finite Difference Method（FDM）based on a fixed regular Cartesian grid system is applied for solving flow field,and the FEM based on a Lagrangian grid system is used to solve structural deformation.A volume weighted scheme based on Immersed Boundary（IB）method is adopted to couple the flow solver and the structural *** of impact loads between cases with and without elastic baffle are carried *** show that the elastic structure motion has great influence on the impact loads.

关键词： Sloshing impact loads Coupled FDM-FEM method Elastic structure Fluid-Structure interaction

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Lasers 2000年第5期9卷 51-55页

作者： LIU Kai HUANG Yongqing REN Xiaomin LI Jianxin GUO Wei (Optical Communication Center, Beijing University of Posts and Telecommunications, Beijing 100876, China)MA Xiaoyu kang Xuejun liao Qiwei (Institute of Semiconductor, The Chinese Academy of 北京邮电大学北京中科院半导体所北京

A new kind of wavelength selective photoreceiver is proposed. It was constructed by a Fabry Perot (F P) etalon filter and a resonant cavity enhanced (RCE) photodetector. The photoreceiver′s spectral response is determined by the F P etalon filter with a FWHM of less than 4 nm. Moreover, with such a photoreceiver, the transmission loss of the F P etalon filter can be compensated to some extent. And this will benefit its applications.

关键词： wavelength selection photodetector WDM and optoelectronics device