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Dynamic simulation and optimization approach to construction diversion of hydraulic and hydroelectric projects

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Science China(Technological Sciences) 2009年第7期52卷 1990-1998页

作者： ZHONG DengHua li mingchao HUANG Wei liU Yong Department of Hydraulic and Hydroelectric Engineering School of Civil EngineeringTianjin UniversityTianjin 300072China

To solve the engineering and scientific problems in construction diversion and its simulation analysis, a complete scheme is presented. Firstly, the complex constraint relationship was analyzed among main buildings, diversion buildings and flow control. Secondly, the time-space relationship model of construction diversion system and the general block diagram-oriented simulation model of diversion process were set up. Then, the corresponding numerical simulation method and 3D dynamic visual simulation method were put forward. Further, the simulation and optimization platform of construction diversion control process was developed, integrated with simulation modeling, computation and visualization. Finally, these methods were applied to a practical project successfully, showing that the modeling process is convenient, the computation and the visual analysis can be coupled effectively, and the results conform to practical state. They provide new theoretical principles and technical measures for analyzing the control problems encountered in construction diversion of hydraulic and hydroelectric engineering under complex conditions.

关键词： construction diversion dynamic simulation optimization analysis block diagram hydraulic and hydroelectric project

Recent Advances in Interface Modification of Cu/graphite Composites and Layered Ternary Carbides of Modified Layer Candidate

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Journal of Wuhan University of Technology(Materials Science) 2024年第5期39卷 1061-1072页

作者： WEI Hongming li mingchao li Xiaoya ZHAN Wenyi li Feiyang DAI Yanzhang ZOU Jianpeng State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Guangxi Fangchenggang Nuclear Power Co. Ltd.Fangchenggang 538000China

We review the fundamental properties and significant issues related to Cu/graphite *** particular,recent research on the interfacial modification of Cu/graphite composites is addressed,including the metal-modified layer,carbide-modified layer,and combined modified ***,we propose the use of ternary layered carbide as an interface modification layer for Cu/graphite composites.

关键词： Cu/graphite composites interfacial bonding surface modification wettability layered ternary carbides

Discriminating among tectonic settings of spinel based on multiple machine learning algorithms

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Big Earth Data 2019年第1期3卷 67-82页

作者： Shuai Han mingchao li Qiubing Ren State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjinChina

In geochemistry,researchers usually discriminate among tectonic settings by analyzing the chemistry elements of *** studies have generally taken spinel and monoclinic pyroxene as ***,in this research,we took spinel as a *** 1898 spinel samples with 14-dimension chemistry elements were collected from three different tectonic settings,including ocean island,convergent margin,and spreading *** the experiment,20 classification algorithms were conducted in the classification learner application of *** validation accuracies,receiver operating characteristic curves(ROCs),and the areas under ROC curve(AUCs)show that the Bag Ensemble Classifier has the best performance in the *** validation accuracy is 86.3%,and the average AUC is *** further analysis,we studied the importance of different major elements in *** has been found that TiO2 has the best impact on discrimination,and FeOT,Al2O3,Cr2O3,MgO,MnO,and ZnO are of less *** on the Bag Ensemble Classifier,a MATLAB plug-in application named Discriminator of Spinel Tectonic Setting(DSTS)has been developed for promoting the usage of machine learning in geochemistry and facilitating other researchers to use our achievements.

关键词： Geochemistry spinel tectonic setting machine learning discrimination method application development

Mask Distillation Network for Conjunctival Hyperemia Severity Classification

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Machine Intelligence Research 2023年第6期20卷 909-922页

作者： mingchao li Kun Huang Xiao Ma Yuexuan Wang Wen Fan Qiang Chen School of Computer Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Department of Ophthalmology The First Affiliated Hospital with Nanjing Medical UniversityNanjing210029China

To achieve automatic,fast and accurate severity classification of bulbar conjunctival hyperemia severity,we proposed a novel prior knowledge-based framework called mask distillation network(MDN).The proposed MDN consists of a segmentation network and a classification network with teacher-student *** segmentation network is used to generate a bulbar conjunctival mask and the classification network divides the severity of bulbar conjunctival hyperemia into four *** the classification network,we feed the original image and the image with the bulbar conjunctival mask into the student and teacher branches respectively,and an attention consistency loss and a classification consistency loss are used to keep a similar learning mode for these two *** design of“different input but same output”,named mask distillation(MD),aims to introduce the regional prior knowledge that“bulbar conjunctival hyperemia severity classification is only related to the bulbar conjunctiva region”.Extensive experiments on 5117 anterior segment images have proven the effectiveness of mask distillation technology:1)The accuracy of the MDN student branch is 3.5%higher than that of a single optimal baseline network and 2%higher than that of the baseline network combination.2)In the test phase,only the student branch is needed,and no additional segmentation network is *** framework only takes 0.003 s to classify a single image,achieving the fastest speed in all the methods we compared.3)Compared with a single baseline network,the attention of both teacher and student branches in the MDN has been intuitively improved.

关键词： Mask distillation(MD) conjunctiva hyperemia attention mechanism severity classification deep learning

Tectonic discrimination of olivine in basalt using data mining techniques based on major elements:a comparative study from multiple perspectives

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Big Earth Data 2019年第1期3卷 8-25页

作者： Qiubing Ren mingchao li Shuai Han State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjinChina

The olivine in basalt records much information about formation and evolution of basaltic magma,which may help to discriminate basalt tectonic ***,the viewpoint that olivine is connected with the tectonic setting where it formed is *** verify the hypothesis,we intend to discriminate the basalt tectonic settings by geochemical characteristics of *** data mining technique is selected as an effective tool for this study,which is a new attempt in geochemical *** geochemical data of olivine used is extracted from open-access and comprehensive petrological *** classification performance of Logistic regression classifier,Naïve Bayes,Random Forest and Multi-layer perception(MLP)algorithms is firstly compared under some *** results of the basic experiment indicate that MLP has the highest classification accuracy of about 88%based on raw data,followed by Random *** this does not fully prove the hypothesis is ***,the crossvalidation method and other measurement criteria are integrated for scientific and in-depth comparative *** advanced experiments mainly include the comparison of different data preprocessing methods,combinations of geochemical characteristics and sample data *** turns out that chemical composition of olivine in basalt has the function of discriminating tectonic settings.

关键词： Olivine in basalt tectonic setting geochemical discrimination data mining comparative study

An approach to 3D NURBS modeling of complex fault network considering its historic tectonics

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Progress in Natural Science:Materials International 2006年第5期16卷 546-553页

作者： ZHONG Denghua, liU Jie and li mingchao (School of Civil Engineering, Tianjin University, Tianjin 300072, China) School of Civil Engineering Tianjin University Tianjin 300072 China

Fault disposal is a research area that presents difficulties in 3D geological modeling and visualization. In this paper, we propose an integrated approach to reconstructing a complex fault network (CFN). Based on the non-uniform rational B-spline (NURBS) techniques, fault surface was constructed, reflecting the regulation of its spatial tendency, and correlative surfaces were enclosed to form a fault body model. Based on these models and considering their historic tectonics, a method was put forward to settle the 3D modeling problem when the intersection of two faults in CFN induced the change of their relative positions. First, according to the relationships of intersection obtained from geological interpretation, we introduced the topological sort to determine the order of fault body construction and rebuilt fault bodies in terms of the order; then, with the disposal method of two intersectant faults in 3D modeling and applying the Boolean operation, we investigated the characteristic of faults at the intersectant part. An example of its application in hydropower engineering project was proposed. Its results show that this modeling approach can increase the computing efficiency while less computer memory is required, and it can also factually and objectively reproduce the CFN in the engineering region, which establishes a theoretical basis for 3D modeling and analysis of complex engineering geology.

关键词： fault network NURBS technique historic tectonics topological sort 3D modeling.

Detection of composition of functional component theabrownins in Pu-erh tea by degradation method

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Food Science and Human Wellness 2022年第3期11卷 643-647页

作者： Simin Hu Xiaolei li Chuangchuang Gao Xianyu Meng mingchao li Yuqian li Tianrui Xu Qian Hao Faculty of life Science and Technology Kunming University of Science and TechnologyKunming 650500China Research Center for Analysis and Measurement Kunming University of Science and TechnologyKunming 650093China

Habitual tea consumption can reduce the risk of ASCVD morbidity and mortality and all-cause mortality in China,and long-term adherence to this habit can provide greater ***-erh tea is one of the representatives of post-fermented teas,and the polymers in Pu-erh tea have anti-cancer and anti-hyperlipidemic activities,but their chemical composition is still *** this study,the chemical composition of Pu-erh tea was investigated in detail and eight(1–8)known compounds were *** polymers in Pu-erh tea were also degraded by thiol degradation,and the fragments of quercetin and(–)-epicatechin-3-O-gallate were found in the thiol degradation products of Pu-erh tea polymers by UPLC observation and separation and *** is the first time that this fragment was obtained in Pu-erh tea polymer.

关键词： Pu-erh tea Polymer Theabrownin Thiol degradation

Analysis on Brand Development of Private Colleges and Universities in Guangdong-Hong Kong-Macao Greater Bay Area Based on the Perspective of Sustainable Development

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Management Studies 2021年第1期9卷 61-70页

作者： mingchao li Macao University of Science and Technology MacaoChina Zhuhai College of Science and Technology ZhuhaiChina

The special geographical location and political system of the Guangdong-Hong Kong-Macao Greater Bay Area and the international background of coexistence of multiple cultures have strong basic strengths and international advantages in education and talents,and have the rigid conditions for the development of education and talents *** rapid development of the Guangdong-Hong Kong-Macao Greater Bay Area has brought rare opportunities and challenges to private higher education in *** study analyzes the significance of private higher education for the development of the Bay Area from the perspective of sustainable development theory,and proposes corresponding strategies for high-quality development.

关键词： sustainable development theory Guangdong-Hong Kong-Macao Greater Bay Area private colleges and universities

Paratesticular fibrous pseudotumor： a report of five cases and literature review

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Frontiers of Medicine 2014年第4期8卷 484-488页

作者： Zhicheng Zhang Jun Yang mingchao li Wei Cai Qingquan liu Tao Wang Xiaolin Guo ShaogangWang Jihong liu ZhangqunYe Department of Urology Tongji Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430030 China

Paratesticular fibrous pseudotumor is a rare benign tumor that originates from intrascrotal tissue, such as tunica vaginalis, epididymis, or spermatic cord. Five cases of fibrous pseudotumor in our hospital were reviewed retrospectively, and the clinical manifestations were analyzed. Three cases of unilateral nodules, comprising one case located in the tunica vaginalis and two cases located in the epididymis, underwent local excision of the unilateral nodule. Two cases of diffuse incrassation in the tuniea vaginalis underwent right radical orchiectomy. Postoperative pathological examination showed that all were fibrous pseudotumors. An average follow-up of 26 months showed uneventful results without recurrence for all patients. Fibrous pseudotumor is not a neoplasm but a reactive fibrous inflammatory hyperplasia. Definitive diagnosis requires pathological examination. Radical orchiectomy should be avoided when possible, and local excision should be performed because of the lack of obvious evidence of potential malignancy.

关键词： fibroma inflammation scrotum testicular neoplasm