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Waverider configurations derived from general conical flowfields

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Acta Mechanica Sinica 2007年第3期23卷 247-255页

作者： kai cui Dongxu Zhao Guowei Yang Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of SciencesBeijing 100080 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116023 China Weihai Bureau of Information Industry Weihai 264200 China

A method based on the computational fluid dynamics （CFD） is presented for a flexible waverider＇s design. The generating bodies of this method could be any cones. In addition, either the leading edge or the profile of the scramjet＇s inlet is used as the waverider＇s definition curve, parameterized by the quadric function, the sigmoid function or the B-spline function. Furthermore, several numerical examples are carried out to validate the method and the relevant codes. The CFD results of the configurations show that all the designs are successful. Moreover, primary suggestions are proposed for practical design by comparing the geometrical and aerodynamic performances of the conederived waveriders at Mach 6.

关键词： Waverider Hypersonic Computational fluid dynamics

The effect of conical flowfields on the performance of waveriders at Mach 6

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Chinese Science Bulletin 2007年第1期52卷 57-64页

作者： cui kai YANG GuoWei Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116023 China

The performance of 23 kinds of waveriders, derived from different conical flowfields, is analyzed by the numerical computation under the conditions of fight speed of Mach 6, attack angle of 0° and flight alti- tude of 30 km. These results indicate that the performance is influenced by the shapes and the width to height ratios (W/H ) of generating cones. The geometrical parameter and the lift coefficient are propor- tional to W/H, while the drag coefficient and the lift to drag ratio (L/D ) have extreme values. Considering the base drag and the computation errors, the waverider with the highest L/D is cut from the elliptical cone’s flowfield (W/H = 1.5―1.618), and the configuration with the lowest drag can also be obtained at W/H = 1:1.5. Accordingly, good suggestions are proposed for practical design based on these compu- tational results.

关键词：高超声速风洞波纹度火箭动力学

面向中国本土的理性主义设计方法——崔愷院士访谈

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建筑学报 2019年第5期 1-9页

作者：崔愷范路中国建筑设计研究院有限公司清华大学建筑学院

以往,大家对于崔愷院士作品和思想的讨论主要聚焦在“本土”上。但细读《本土设计Ⅱ》,尤其是江苏建筑职业技术学院图书馆项目和介绍其设计理念的《设计的逻辑》一文,还会发现其中蕴含着深刻的理性主义建筑思想和设计方法。这种理性主... 详细信息

以往,大家对于崔愷院士作品和思想的讨论主要聚焦在“本土”上。但细读《本土设计Ⅱ》,尤其是江苏建筑职业技术学院图书馆项目和介绍其设计理念的《设计的逻辑》一文,还会发现其中蕴含着深刻的理性主义建筑思想和设计方法。这种理性主义注重美学意境.生活体验、工程技术和经济合理的多元整合;强调设计意图充分贯彻.建筑语言丰富变化又逻辑一致的建筑品质;更是面向中国本土、传统智慧和绿色人文的可持续性思想方法。

关键词：设计意图理性主义院士中国职业技术学院建筑思想经济合理工程技术

Research progress on the development mechanism and exploratory protection of the scaling off on earthen sites in NW China

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Science China(Technological Sciences) 2023年第8期66卷 2183-2196页

作者： DU YuMin DONG WenQiang cui kai CHEN WenWu YANG WeiLi Institute of Culture and Heritage Northwestern Polytechnical UniversityXi’an 710072China Western Center for Disaster Mitigation in Civil Engineering of Ministry of Education of China School of Civil EngineeringLanzhou University of TechnologyLanzhou 730050China Key Scientific Research Base of the State Administration of Cultural Heritage for the Conservation and Restoration of Murals and Material Science Research Northwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Mechanics on Disaster and Environment in Western China College of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China

The scaling off is among the most pervasive and severe deterioration *** scaling off developed on earthen sites in Northwest China has a special and complex binary structure composed of crusted and loose *** the synergistic functions of external environmental elements such as rainfall,temperature,and wind,and rammed earth properties,this deterioration has gradually created the crust on the site’s surface,and has then evolved into exfoliation and finally fallen off,leading to the reciprocating progressive destruction of earthen ***,determining the development mechanism of scaling off and implementing targeted protection measures for the scientific conservation of earthen sites has become *** this review study,the properties of the building material causing the binary structure and the coupling effects of water,temperature,salt,and wind on the development of scaling off were determined,and the quantitative evaluation system for this deterioration development was *** interpreting the reasons for the development of the scaling off,protective measures including chemical grouting,electro-osmosis grouting,and overlay applications were *** study also pointed out the research hotspots and shortage in the study process on the scaling *** hotspots generally focused on the development mechanism of binary structure,quantitative assessment of the degree of development,and related scientific consolidation *** shortcomings around the above directions include less attention to the development characteristics and mechanism of scaling off on earthen sites under special environment types,optimization and applicability of quantitative evaluation models,and the development and feasibility of reinforcement slurries and *** study can be beneficial in providing theoretical support for the scientific conservation and engineering practice of the scaling off on the earthen sites.

关键词： scaling off earthen sites binary structure development mechanism quantitative evaluation protection

Numerical Simulation of Solidification Process on Single Crystal Ni-Based Superalloy Investment Castings

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Journal of Materials Science & Technology 2007年第1期23卷 47-54页

作者： Jing YU Qingyan XU kai cui Baicheng LIU Akihiko KIMATSUKA Key Laboratory for Advanced Materials Processing Technology Ministry of Education Department of Mechanical Engineering Tsinghua University Beijing 100084 China Ishikawajima-Harima Heavy Industries Co. Ltd. Isogo-Ku Yokohama 235-8501 Japan

Bridgman directional solidification of investment castings is a key technology for the production of reliable and highly efficient gas turbine blades. In this paper, a mathematical model for three-dimensional （3D） simulation of solidification process of single crystal investment castings was developed based on basic heat transfer equations. Complex heat radiation among the multiple blade castings and the furnace wall was considered in the model. Temperature distribution and temperature gradient in superalloy investment castings of single blade and multiple ones were investigated, respectively. The calculated cooling curves were compared with the experimental results and agreed well with the latter. It is indicated that the unsymmetrical temperature distribution and curved liquid-solid interface caused by the circle distribution of multiple turbine blades are probably main reasons why the stray grain and other casting defects occur in the turbine blade.

关键词： Directional solidification Single crystal Investment casting Numerical simulation

Correlation of genes associated with drug response to prognosis of large cell lung carcinoma

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Chinese Journal of Cancer 2011年第7期30卷 497-504页

作者： Cheng Chen Xiang-Li Jiang cui-cui Zhang kai Li Department of Medical Thoracic Oncology TianjinMedical University Cancer Institute and Hospital Tianjin 300060 P. R.China.

Platinum-based chemotherapy remains the main treatment of advanced lung cancer. However, platinum resistance has become a major treatment obstacle. Novel therapies, particularly tyrosine kinase inhibitors of the epidermal growth factor receptor (EGFR-TKI) and agents that target vascular endothelial growth factor (VEGF), have improved the treatment. Both chemotherapy and targeted therapy have their molecular mechanisms. This study aimed to determine the mutation, amplification, or expression status and interrelationships of the epidermal growth factor receptor (EGFR), K-Ras proto-oncogene, excision repair cross-complementation group 1 (ERCC1), and VEGF genes as well as their correlations to prognosis of large cell lung carcinoma (LCLC) after EGFR-targeted therapy, chemotherapy, and anti-VEGF therapy. EGFR and K-Ras mutations in 60 specimens of LCLC were detected by direct DNA sequencing. EGFR, ERCC1, and VEGF protein expression was detected by immunohistochemistry (IHC). EGFR gene copy number was detected by fluorescence in situ hybridization (FISH). One (1.7%) patient had an EGFR L858M point mutation in exon 21, 3 (5.0%) had K-Ras mutations, and 10 (19.6%) had EGFR amplification (FISH positive). Positive rates of EGFR, ERCC1, and VEGF proteins were 38.3%, 56.7%, and 70.0%, respectively. EGFR amplification was positively correlated to EGFR protein expression (r = 0.390, P = 0.005). The positive rate of VEGF protein was significantly higher in patients with lymph node metastasis than in those without (84.6% vs. 58.8%, P = 0.046). No significant correlations were observed among the EGFR, K-Ras, ERCC1, and VEGF genes. EGFR gene amplification and the low rate of EGFR mutation suggest that patients with LCLC are likely to obtain little benefit from anti-EGFR therapies.

关键词：相关基因表皮生长因子受体血管内皮生长因子药物反应肺癌预后细胞基因突变检测

Hypersonic I-shaped aerodynamic configurations

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Science China(Physics,Mechanics & Astronomy) 2018年第2期61卷 69-71页

作者： kai cui Yao Xiao YingZhou Xu GuangLi Li Key Laboratory of High Temperature Gas Dynamics of Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Hypersonic vehicles, which flight at Mach numbers greater than 5, will serve as a more convenient and efficient transport tool than present subsonic airplanes for long-distance jour- neys in future. Typically, it only takes a couple of hours from Beijing to New York at hypersonic speed. Recent interest in these vehicles has grown intensively, and various types of in- novative designs have been proposed and studied. Despite entering the age of hypersonic flight, there still exist many problems to resolve [1-4]. How to design an advanced aero- dynamic configuration is one of them [5].

关键词： Hypersonic I-shaped aerodynamic configurations

Comparative evaluation of concrete sand-control fences used for railway protection in strong wind areas

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Railway Engineering Science 2021年第2期29卷 183-198页

作者： Long Shi Dongyuan Wang kai cui Chunxiao Xue School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of High-Speed Railway Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China Northwestern Research Institute Co. Ltd.China Railway Engineering CorporationLanzhou 730000China

Concrete-plate fences have been widely adopted for windblown sand control and mitigation along ***,the inclination angles of inserting the concrete plate with respect to the vertical direction,i.e.,straight or obliquely inserted concrete plates(SIP or OIP),significantly influence the efficiency of *** study performs a comparative evaluation of the SIP and OIP sand-control fences using wind tunnel testing and field monitoring data collected from the Lanzhou–Wulumuqi High-Speed Railway *** results show that the fence’s ability to reduce the wind speed and the sand-retaining efficiency gradually weakens with the increasing wind *** with the SIP fence,the OIP fence has a better wind speed reduction capability,stronger ability to capture fine particles below the top of the fence;it is more efficient for sand-retaining and induces stronger eddy ***,the wind tunnel test and field monitoring results are consistent,whereas wind tunnel tests incline to overestimate wind speed reduction and sand-control *** study also finds that the aeolian sand accumulated around the fence can weaken the protection efficiency,and hence cleaning the aeolian sand accumulated around the fence should be done periodically to ensure the designed functions.

关键词： Concrete-plate fences Plate-inserting methods Sand-control performance evaluation Wind-sand flow Wind tunnel test Field monitoring

Deep-learning-based extraction of the animal migration patterns from weather radar images

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Science China(Information Sciences) 2020年第4期63卷 59-68页

作者： kai cui Cheng HU Rui WANG Yi SUI Huafeng MAO Huayu LI Radar Research Laboratory School of Information and Electronics Beijing Institute of Technology Key Laboratory of Electronic and Information Technology in Satellite Navigation (Beijing Institute of Technology) Ministry of Education

Continental coverage and year-round operation of the weather radar networks provide an unprecedented opportunity for studying large-scale airborne migration. The broad and local-scale airborne information collected by these infrastructures can answer many ecological questions. However, extracting and interpreting the biological information from such massive weather radar data remains an intractable problem. Recently, many big-data problems have been solved using the deep learning technology. In this study, the biological information in the weather radar data is identified using the advanced deep learning method. The proposed method consists of two main parts, i.e., a rendering and casting procedure and an image segmentation procedure based on a convolutional neural network. The biological data are automatically extracted by rendering and mapping, image segmentation, and result masking. By analyzing the typical radar data from single and multiple stations, we partly reveal the intensity and speed of the migration pattern. We present the first feasibility study of the extraction of local and large-scale biological phenomena from the Chinese weather radar network data.

关键词： weather radar deep learning aerial animal migration pattern Chinese weather radar network