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Automatic modelling of urban subsurface with ground-penetrating radar using multi-agent classification method

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Geo-Spatial Information Science 2022年第4期25卷 588-599页

作者： Tess Xianghuan Luo Pengpeng yuan song Zhu Guangdong Key Laboratory of Urban Informatics Shenzhen UniversityShenzhenChina Department of Land Surveying and Geo-informatics The Hong Kong Polytechnic UniversityHong KongChina College of Civil and Transportation Engineering Shenzhen UniversityShenzhenChina

The subsurface of urban cities is becoming increasingly ***-time records of subsur-face structures are of vital importance for the maintenance and management of urban infrastructure beneath or above the ***-penetrating radar(GPR)is a nondestructive testing method that can survey and image the subsurface without ***,the interpretation of GPR relies on the operator’s *** automatic workflow was proposed for recognizing and classifying subsurface structures with GPR using computer vision and machine learning *** workflow comprises three stages:first,full-cover GPR measurements are processed to form the C-scans;second,the abnormal areas are extracted from the full-cover C-scans with coefficient of variation-active contour model(CV-ACM);finally,the extracted segments are recognized and classified from the corresponding B-scans with aggregate channel feature(ACF)to produce a semantic *** selected computer vision methods were validated by a controlled test in the laboratory,and the entire workflow was evaluated with a real,on-site case *** results of the controlled and on-site case were both *** study establishes the necessity of a full-cover 3D GPR survey,illustrating the feasibility of integrating advanced computer vision techniques to analyze a large amount of 3D GPR survey data,and paves the way for automating subsurface modeling with GPR.

关键词： Subsurface modeling ground-penetrating radar computer vision active contour model aggregate channel feature

Application of A Fully Nonlinear Higher-Order Element Method for Modelling Three-Dimensional Wave Entry of A Cone

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China Ocean Engineering 2021年第6期35卷 814-827页

作者： yuan Dong-chuang CHENG Yong JI chun-yan School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Fully nonlinear water entry of a cone into waves with gravity effect has been analyzed based on a three-dimensional(3D)higher-order boundary method(HOBEM).The total velocity potential at the initial time is divided into the incident and scattering *** the subsequent time steps,the solution of the velocity potential is defined as a whole through instantaneous boundary *** on the image theory,a modified Green function is applied to establish the integral equations so that only half of the calculation domain is considered and the seabed can be *** free surface elevation is tracked along a given azimuth plane in the polar coordinate system,while the horizontal motion of the water particle is updated by using a segment-spring analogy method,which redistributes nodes and maintains mesh connectivity according to linear *** auxiliary function is applied to solve the pressure distribution,instead of directly calculating time derivative of the velocity *** high accuracy of the present numerical method is achieved through a detailed convergence study and comparison with results in the *** are emphatically performed to examine the effects of gravity,wave nonlinearity,entry location,and oblique entry.

关键词： wave entry HOBEM time-domain simulation Green function segment-spring analogy method

Interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints during aging

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1497-1505页

作者： yuan Li Yan-ping Zeng Zhi-chun Wang School of Materials Science&Engineering University of Science and Technology BeijingBeijing 100083China North China Electric Power Research Institute Co. Ltd.Beijing 100045China

The interfacial microstructure evolution of 12Cr1MoV/TP347H dissimilar steel welded joints with a nickel-based filler metal during aging was studied in detail to elucidate the mechanism of premature failures of this kind of *** results showed that not only a band of granular Cr_(23)C_(6)carbides were formed along the fusion boundary in the ferritic steel during aging,but also a large number of granular or plate-like Cr_(23)C_(6)carbides,which have a cube-cube orientation relationship with the matrix,were also precipitated on the weld metal side of the fu-sion boundary,making this zone be etched more easily than the other zone and become a dark etched *** faults were found in some Cr_(23)C_(6)*** the as-welded state,deformation twins were observed in the weld metal with a fully austenitic *** peak micro-hardness was shifted from the ferritic steel side to the weld metal side of the fusion boundary after aging and the peak value increased *** on the experimental results,a mechanism of premature failures of the joints was proposed.

关键词： ferritic/austenitic dissimilar steel welded joint interfacial microstructure aging nickel-based filler metal mechanism of premature failures

ON THE PROBLEM OF DISSIPATIVE PERTURBATIONS OF NONEXPANSIVE MAPPINGS

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Applied Mathematics and Mechanics(English Edition) 2001年第4期22卷 478-482页

作者： LUO yuan-song(罗元松) Department of Mathematics Yibin Teachers'' CollegeYibin 644007 P R China

Some Fixed point theorems for mappings of the type - A + T are established, where P is a cone in a Hilbert space, A: P --> 2(P) is an accretive mappings and T: P --> P is a nonexpansive mappings. In application, the results presented in the paper are used to study the existence problem of solutions far a class of nonlinear integral equations in L-2 (Omega).

关键词： nonexpansive mapping accretive mapping fixed point theorem nonlinear integral equation

Slab Storage Calculation Method for Continuous Casting-Hot Rolling

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Journal of Iron and Steel Research International 2004年第1期11卷 33-36页

作者： PENGQi-chun LIUQing TIANNai-yuan WuhanUniversityofScienceandTechnology Wuhan430081China UniversityofScienceandTechnologyBeijing Beijing100083China

Based on load-oriented manufacturing control theory,different combining modes and slab storage calculation method for continuous casting and hot rolling were *** buffer capacity index of continuous casting-rolling was introduced,and the reasonable slab storage under different combining modes was calculated with buffer capacity index of 120.00 hfor CCR,79.20 hfor HCR,19.68 hfor DHCR and 3.84 hfor *** slab is 1.20 h,and the strip is *** gist was provided for steel enterprise to decrease storage.

关键词： continuous casting hot rolling production control slab storage

SEEDi^(1.0-3.0) strategies for major noncommunicable diseases in China

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Journal of Integrative Medicine 2017年第4期15卷 265-269页

作者： chun-song Hu Tengiz Tkebuchava Department of Cardiovascular Medicine Nanchang University Boston TransTec LLC

The purpose of this article is to briefly introduce the status and challenges of major noncommunicable diseases （mNCDs）, which include cardiovascular disease, diabetes and cancer, as well as related risk factors, such as environmental pollution, smoking, obesity and sleep disorders. ＂S-E-E-D＂ rules or the strategies of ＂S-E-E-D＂ intervention （SEEDi） consist of four core healthy elements： sleep, emotion, exercise and diet. The history of SEEDi1.0-3.0 is also introduced, which includes versions 1.0, 1.5, 2.0 and 3.0 of the program. These guidelines are suitable for prevention and control of mNCDs. Not only the ＂Healthy China＂ initiated in China＇s ＂13th Five-year Plan,＂ but also the ＂Healthy World＂ philosophy needs SEEDi1.0-3.0 strategies for control of mNCDs.

关键词： noncommunicable diseases cardiovascular disease diabetes mellitus cancer lifestyle

Linear and Nonlinear Spectra in Photosynthetic Light Harvesting Complexes: Benchmark Tests of Modified Redfield Method

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Chinese Journal of Chemical Physics 2015年第4期28卷 -页

作者： yuan-yuan Jing Kai song Shu-ming Bai Qiang Shi Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of Chemistry Chinese Academy of Sciences Beijing 100190China

We employ the numerically exact hierarchical equations of motion (HEOM) method to perform benchmark tests for the popular modified Redfield method in calculating linear and nonlinear spectroscopic signals of molecular aggregates in photosynthetic light harvesting complexes. It is currently well known that the perturbative and Markovian approximations involved in the modified Redfield equation may give inappropriate description of the excitation energy transfer processes in the intermediate coupling regime. An interesting topic is thus to test the validity of the modified Redfield method in calculating various types of spectroscopic signals. By using model dimers with different sets of parameters and a model of the Fenna-Matthews-Olson complex, we calculate and compare the absorption, emission, and 2D spectra using the modified Redfield and HEOM methods. It is found that results from the modified Redfield method agree well with the HEOM ones in a wide range of parameter regimes. The comparison also helps to understand the quantum beating signals in the 2D spectra of the photosynthetic light harvesting complexes.

关键词： Linear spectra Nonlinear spectra Light harvesting complexes Modified Redfield method

E-noise: An increasingly relevant health risk

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Journal of Integrative Medicine 2019年第5期17卷 311-314页

作者： chun-song Hu Tengiz Tkebuchava Jiangxi Academy of Medical Science Hospital of Nanchang UniversityNanchang UniversityNanchang 330006Jiangxi ProvinceChina oston TransTec LLCBostonMA 02459USA

This article briefly reviews and discusses the current status of major non-communicable diseases(m NCDs), definition of e-noise, its possible link as a risk factor for cardiovascular diseases and other m NCDs, and proposes possible mechanisms and hypotheses on that link, and how to control e-noise in the future. E-noise is defined as signal from electronic products and instruments that emit radiation and electromagnetic fields. It includes not only the acoustic but also non-acoustic noise. Just like road traffic and aircraft noises, e-noise may not only lead to hearing loss and health problems such as fatigue,stress, irritability, headache, and insomnia, but may also endanger cardiovascular health and result in hypertension, ischemic heart disease(myocardial infarction), arrhythmia(atrial fibrillation) and stroke;brain and metabolic problems such as obesity and diabetes;mental and cognitive impairment;as well as changing of humans’ long-evolved cortisol and circadian rhythms after long-term exposure. Even shortterm exposure to excessive e-noise may lead to heightened stress responses and low quality of life. In conclusion, e-noise is a potential danger in our world, and further studies are needed of its effects on mechanisms of aging, disease, and human health.

关键词： Environment E-noise Healthrisk Lifestyle Long-term exposure

Effect of ramipril on progression of nonculprit lesions in patients with ST-elevation myocardial infarction after primary percutaneous coronary intervention

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Journal of Geriatric Cardiology 2019年第9期16卷 695-700页

作者： Jian WANG song-yuan HE Department of Cardiology Aerospace Central Hospital Aerospace Clinical Medical College of Peking University

Objective To investigate the effect of ramipril on progression of nonculprit lesions in patients with ST-elevation myocardial infarction(STEMI) after primary percutaneous coronary intervention(PPCI). Methods A total of 200 patients(60.1 ± 11.3 years) with STEMI who underwent successful PPCI from January 2010 to December 2013 were enrolled in this study. All patients underwent PPCI as treatment for culprit lesions. Patients were divided into two groups according to the dosage of ramipril used at hospital discharge as follows: high dosage group(2.5–10 mg, q.d.) and low dosage group(1.25–2.5 mg, q.d.). Clinical and angiographic follow-up was performed for 12 months. The primary endpoint was clinically-driven percutaneous coronary intervention(PCI) for nonculprit lesions. The clinical and angiographic features were analyzed. Results Clinical and angiographic follow-up was performed with 87 patients in the high dosage group and 113 patients in the low dosage group. The numbers of patients who underwent additional PCI were six and 20 in the high and low dosage groups, respectively. The rate of having additional PCI performed was lower in the high dosage group than in the low dosage group(6.90% vs. 17.70%, P = 0.03). Conclusions A high dosage of ramipril may prevent progression of nonculprit lesions, which could be the major cause of recurrent PCI in patients with STEMI after PPCI.

关键词： Nonculprit lesion Primary percutaneous coronary intervention Ramipril ST-elevation myocardial infarction