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Rapid prediction of damaged ship roll motion responses in beam waves based on stacking algorithm

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Journal of Hydrodynamics 2024年第2期36卷 394-405页

作者： Xin-ran Liu Ting-qiu Li Zi-ping Wang School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan430063China

Accurate modeling for highly non-linear coupling of a damaged ship with liquid sloshing in waves is still of considerable interest within the computational fluid dynamics(CFD)and AI *** paper describes a data-driven Stacking algorithm for fast prediction of roll motion response amplitudes in beam waves by constructing a hydrodynamics model of a damaged ship based on the dynamic overlapping grid CFD *** general idea is to optimize various parameters varying with four types of classical base models like multi-layer perception,support vector regression,random forest,and hist gradient boosting *** offers several attractive properties in terms of accuracy and efficiency by choosing the standard DTMB 5415 model with double damaged compartments for *** is clearly demonstrated that the predicted response amplitude operator(RAO)in the regular beam waves agrees well with the experimental data available,which verifies the accuracy of the established damaged ship hydrodynamics *** high-quality CFD samples,therefore,implementation of the designed Stacking algorithm with its optimal combination can predict the damaged ship roll motion amplitudes effectively and accurately(e.g.,the coefficient of determination 0.9926,the average absolute error 0.0955 and CPU 3s),by comparison of four types of typical base models and their various ***,the established Stacking algorithm provides one potential that can break through problems involving the time-consuming and low efficiency for large-scale lengthy CFD simulations.

关键词： ship motion damaged ship computational fluid dynamics(CFD) machine learning stacking algorithm

Analysis of China's Electricity Price and Electricity Burden of Basic Industries under the Carbon Peak Target before 2030

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 481-491页

作者： Yue qiu Suyang Zhou Wei Gu Xiao-ping Zhang School of Electrical Engineering Southeast UniversityNanjingChina School of Electronic Electrical and System EngineeringUniversity of BirminghamU.K.

The Chinese government is deepening reformation of electricity prices during the 14th Five Year Plan period and has set a carbon emission reduction target of reaching carbon peak before *** this context,will the carbon emission target influence electricity pricing and will electricity price influence competitiveness of Chinese main industries are two questions needing to be *** paper compares China's electricity price level with the selected major countries in the world,and four typical industries are selected to evaluate their electricity burden ***,the correlation between residential electricity price and industrial electricity price and the influencing factors is analyzed,from the perspectives of scale,structure and *** to the model obtained by regression analysis,the electricity price level and corresponding residential and industrial electricity burden in 2025 and 2030 are *** Terms-Electricity burden,industrial electricity price,regression analysis,residential electricity price.

关键词： Electricity burden industrial electricity price regression analysis residential electricity price

Predicting the excavation damaged zone within brittle surrounding rock masses of deep underground caverns using a comprehensive approach integrating in situ measurements and numerical analysis

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Geoscience Frontiers 2022年第2期13卷 186-199页

作者： Ding-ping Xu Xiang Huang Shao-Jun Li Huai-Sheng Xu shi-Li qiu Hong Zheng Quan Jiang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

Excavation Damaged Zone(EDZ)scope is important for optimizing excavation and support schemes in deep underground ***,accurately predicting the full EDZ scope within the surrounding rock masses of deep underground caverns during excavation remains a pressing *** study presents a comprehensive EDZ scope prediction approach(CESPA)for the brittle surrounding rock masses of deep underground caverns by coupling numerical simulation with quantitative analysis of borehole wall images and ultrasonic test ***,the changes in both P-velocity(V_(p))and joint distribution of the surrounding rock masses before and after excavation damage are captured using ultrasonic tests and borehole digital ***,the quality Q-parameters of the surrounding rock mass before and after excavation damage are preliminarily rated with the rock mass descriptions provided by borehole wall images,and the rock mass V_(p)-parameter values are determined according to the V_(p)-borehole depth ***,the Q-parameter ratings are further finely adjusted by updating the related Q-values to be similar with the Q-values estimated by V_(p)-parameter ***,the initial and residual mechanical parameters for the rock mass deterioration model(RDM)are estimated by the adjusted Q-parameter ratings based on the modified Q-based relations,and the elastic modulus deterioration index(EDI)threshold to describe the EDZ boundary is determined with the V_(p)-parameter ***,EDZ scope is predicted using the elastoplastic numerical simulation with RDM and EDI based on the mechanical parameter estimates and EDI *** of applications in Sub-lab D1 in Jinping II project show that CESPA can provide a reliable and operable solution for predicting full EDZ scopes within the brittle surrounding rock masses of deep underground caverns.

关键词： Excavation damaged zone Borehole digital camera Ultrasonic test Q-system Rock mass deterioration model

SIMULATION OF SEDIMENT-LADEN FLOW BY DEPTH-AVERAGED MODEL BASED ON UNSTRUCTURED COLLOCATED GRID

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Journal of Hydrodynamics 2007年第4期19卷 525-532页

作者： LIU shi-he LUO qiu-shi MEI Jun-ya School of Water Resource and Hydropower Wuhan University Wuhan 430072 China

The 2-D depth-averaged mathematical model for sediment-laden flows has been widely used in river control and other related engineering problems, and now it is usually solved on structured grids. Since the natural river is usually very complicated in plane boundary, and unstructured grids are more attractive in solving the problems with complicated domains, the following questions about solving 2-D depth-averaged model were discussed in this article：（1） a modified Bowyer algorithm was suggested to generate unstructured grids for natural rivers, （2） the Finite Volume Method （FVM） is employed to discretize the governing equations of the 2-D depth-averaged model and an implicit scheme was suggested with unstructured collocated grids, （3） the observed hydrological data of the Chenglingji Reach in the Yangtze River are used for verification of the presented method It seems that the suggested numerical scheme works very well, and the simulation results of both hydraulic characteristics and river bed deformation are in good agreement with the observed ones.

关键词： Bowyer algorithm unstructured grid SIMPLE algorithm

Satellite anomaly detection based on reconstruction discrepancy theory utilizing a new dual-branch reconstruction model

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Science China(Technological Sciences) 2024年第10期67卷 3294-3307页

作者： ZHAO HaoTian qiu shi LIU Ming CAO XiBin Research Center of Satellite Technology School of AstronauticsHarbin Institute of TechnologyHarbin 150001China

To enhance the accuracy of deep learning methods based on reconstruction discrepancy in satellite anomaly detection tasks,this study proposes a dual-branch reconstruction model(DBRM)and designs a comprehensive satellite anomaly detection framework around this ***,we introduce the temporal-channel mixer(TC-Mixer)module,which mainly comprises a self-attention layer for capturing long-range temporal dependencies in telemetry data,and two types of feed-forward networks(FFN)for extract-ing complex patterns in the temporal and channel dimension of telemetry *** design endows the TC-Mixer module with robust capabilities for extracting complicated dependencies in telemetry ***,with the TC-Mixer module as the main component,we designed the *** model utilizes a shared latent representation layer,allowing the regeneration branch and forecasting branch of the DBRM to share most of the feature extraction network *** approach significantly en-hances the model’s regression accuracy while reducing computational ***,using the DBRM as the core network model,we devised a comprehensive satellite anomaly detection *** includes an anomaly criterion that considers the reconstruction discrepancy of both the regeneration and forecasting branches,the peak-over-threshold(POT)method for anomaly thresholding,and the MIC-based feature engineering method,***,we conducted comparative experiments with several SOTA anomaly detection algorithms on two public and one private satellite anomaly detection *** experimental results validate the effectiveness and superiority of our proposed method.

关键词： anomaly detection reconstruction discrepancy dual-branch reconstruction model(DBRM) satellite telemetry data time series

Impact of being underweight on peri-operative and post-operative outcomes of total knee or hip arthroplasty:A meta-analysis

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World Journal of Clinical Cases 2022年第30期10卷 10967-10983页

作者： Yun-ping Ma qiu Shen Department of Orthopedics Huzhou Central HospitalAffiliated Central Hospital of Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina

BACKGROUND Many systematic reviews have focused on assessing the effect of body mass index(BMI)on the outcomes and complications associated with total hip arthroplasty(THA)and total knee arthroplasty(TKA),but primarily dealt with obesity compared to normal weight(NW).None of these reviews attempted to assess the effect of low BMI or underweight(UW)compared to NW in patients undergoing THA or *** This review aims to compare specific operative outcomes such as operation duration,length of hospital stay,and post-operative complications including mortality,infections,deep vein thrombosis,*** with re-hospitalization and reoperation rates between UW and NW patients undergoing THA,TKA or *** An electronic search was performed in PubMed,Scopus,Excerpta Medica database(EMBASE),Web of Science(WoS),and Cochrane Central Register of Controlled Trials(CENTRAL)along with a manual *** quality of the studies was assessed using the Newcastle-Ottawa scale for cohort *** data were subjected to both qualitative and quantitative *** Thirteen retrospective and five prospective cohort studies were *** quality of included studies was assessed to be good to *** length of hospital stay after TKA or THA was found to be significantly higher for UW patients when compared to NW patients,with a mean difference:0.3995%CI:[0.06,0.72],P=0.02(in days).Studies presenting both THA and TKA together as total joint arthroplasty showed an increased incidence of mortality in patients treated with THA or TKA alone,Odds ratio:4.1895%CI:[2.88,6.07].A higher incidence of post-ope-rative complications was also observed in UW patients undergoing *** UW patients undergoing THA or TKA had a higher incidence of post-operative complications and were associated with a higher readmission ***,UW patients were associated with an increased incidence of mortality in the studies that reported THA and TKA together.

关键词： Underweight Total knee arthroplasty Total hip arthroplasty Systematic review Meta-analysis

The expression and distribution of α-Gal gene in various species ocular surface tissue

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International Journal of Ophthalmology(English edition) 2012年第5期5卷 543-548页

作者： Yi Shao, qiu-ping Liu Department of Ophthalmology the First Affiliated Hospital of Nanchang University Nanchang 330006 Jiangxi Province China Department of Endocrinology the Third Hospital of Nanchang the Affiliated Nanchang Hospital of Southern Medical University Nanchang 330009 Jiangxi Province China Cullen Eye Institute of Baylor Universit Houston Texas 77030 USA

AIM: To examine the α-Gal gene expression and distribution in the different species/genus and developing phase animal ocular surface ***: α-Gal binding assay were carried out on various animal eye sections. Photograph, slit-lamp observation on various eye showed normal corneal ***: A strong α-Gal expression in invertebrates and some vertebrates ocular tissue, but no α-Gal binding in birds, fish and mammal. α-Gal expression change in the development of mice ocular surface tissue (except sclera) and display genus dependency in the different murine ocular surface ***: This study identified specific α-Gal epitopes binding area in the ocular surface of several species and may solve the problem that naive ocular surface may be used as natural α-Gal gene knockout model/high risk immunologic rejection model or ocular surface scaffold material.

关键词： α-Gal xenotransplantation animal ocular surface tissue engineering

Topological Vortices in Superfluid Films

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Communications in Theoretical Physics 2005年第1X期44卷 160-164页

作者： WANGJun-ping DUANYi-shi InstituteofTheoreticalPhysics LanzhouUniversityLanzhou730000China InstituteofScienceandTechnologyforOpto-electronicInformation YantaiUniversityYantai264005China

We study the topological structure of the vortex system in a superfiuid film. Explicit expressions for the vortex density and velocity field as functions of the superfluid order parameter are derived. The evolution of... 详细信息

关键词：拓扑旋涡超流体拓扑结构旋涡密度

Chiral pillar[n]arenes:Conformation inversion,material preparation and applications

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Chinese Chemical Letters 2022年第8期33卷 3613-3622页

作者： Chengxiang shi Hui Li Xiaofeng shi Liang Zhao Hongdeng qiu CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Department of Gansu Provincial Cancer Hospital Institute of Materia MedicaLanzhou 730000China College of Chemistry Zhengzhou UniversityZhengzhou 450001China College of Chemistry and Chemical Engineering Gannan Normal UniversityGanzhou 341000China

Chiral pillar[n]arenes have shown great research value and application prospect in construction of chiral materials and chiral applications,due to their inherent planar chiral configurations,chiral recognition ability,easy modification and highly symmetric hydrophobic *** review systematically summarized the conformation inversion factors of planar chiral pillar[5]arenes(pR/p S),such as solvents,temperature,substituent size,alkyl chains,chiral and achiral guest *** firstly introduced the applications of chiral pillar[n]arenes for constructing chiral materials and pointed out that planar conformation inversion showed a great potential role in constructing chiral ***,we mainly concluded the chiral applications of chiral and planar chiral pillar[n]arenes like chiral enantiomer analysis by circular dichroism,electrochemistry or chiral fluorescence *** this review,we found that the inherent planar chiral conformation of chiral pillar[n]arenes have played a very important role in chiral field in the future.

关键词： Chiral pillar[n]arene Planar chiral configuration Chiral supramolecular materials Chiral separation and analysis Conformation inversion