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Double-plume Lagrangian particle tracking model and its application in deep water oil spill

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Journal of Hydrodynamics 2023年第3期35卷 571-581页

作者： xin-wei ye Xiao-jing Niu Jian Jiang State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing100084China

Due to the density stratification of sea water,the dispersed oil droplets and gas bubbles with small diameters,as well as the dissolved components,may remain in some specific *** double-plume Lagrangian particle tracking model for bubbly plumes in vertical density stratified environments is improved and applied to predict the underwater pollutants in a *** model considers the different properties and dissolution processes of components in crude oil and focuses on their behavior and stratification differences in the *** crude oil components are divided into several groups and the dissolution of oil and gas is also *** model is applied to simulate the“Deepwater Horizon”oil spill accident in the Gulf of Mexico in *** results show several enrichment layers of oil and gas at different depth and the differences in concentration between components,which corresponds to the distribution of petroleum pollutants in the in-situ observation.

关键词： Oil spill double-plume model Lagrangian particle tracking the Gulf of Mexico

Experimental study of non-uniform bubbles in a plume

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Journal of Hydrodynamics 2022年第1期34卷 116-124页

作者： xin-wei ye Hao-jie Zhou Dong-dong Shao Xiao-jing Niu State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing100084China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing100875China

The bubble plume is an important flow phenomenon, ubiquitous in many fields. The non-uniform bubbles in a plume are often simply considered as uniform and moving with a same slip velocity in an integral model. This study aims to have a better understanding of the behavior of the non-uniform bubbles in a plume. A set of experiments are conducted in a transparent water tank, in which the air plumes are generated through different injectors to vary the spectrum of the bubble size. The shadow images of the bubbles are simultaneously recorded with the illumination of a plane backlight. The algorithm used in the image analysis for tracing the bubbles is a newly developed multi-frame method based on the predictor-corrector method, with a good accuracy in estimating the size and the velocity of the overlapped bubbles based on the bubble shadow images. The bubbles are divided into several groups by their equivalent diameters with an interval of 0.5 mm. The spectrums of the bubble size and the void fraction are measured. It is found that the bubbles of different sizes show different dynamics features, resulting in a difference in the radial distribution. It is shown that the large bubbles gather in the center of the plume, while the medium bubbles spread the widest and even wider than the small bubbles. The difference can be explained by the effects of the transverse lift force and the amplitude of the bubble oscillation.

关键词： Bubble plume experiment image analysis bubble size transverse lift force

Three-dimensional fracture of UO2 ceramic pellets by phase field modeling

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 169-180页

作者： wei Xiong Xuan ye Hongzhang Cheng Xiaoming Liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Fracture is the primary failure type for the UO2ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional （3D） UO2ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

Outcomes of loco-regional therapy for down-staging of hepatocellular carcinoma prior to liver transplantation

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Hepatobiliary & Pancreatic Diseases International 2011年第2期10卷 143-150页

作者： Xian-Jie Shi, xin Jin, Mao-Qiang Wang, Li-xin wei, Hui-Yi ye, Yu-Rong Liang, Ying Luo and Jia-Hong DongDepartment of Hepatobiliary Surgery Department of Intervention Radiology Department of Pathology and Department of Radiology General Hospital of PLA, Beijing 100853, China [a] Department of Hepatobiliary Surgery General Hospital of PLA Beijing 100853 China [b] Department of Intervention Radiology General Hospital of PLA Beijing 100853 China [c] Department of Pathology General Hospital of PLA Beijing 100853 China [d] Department of Radiology General Hospital of PLA Beijing 100853 China

BACKGROUND: The number of loco-regional therapies (LRTs) for hepatocellular carcinoma (HCC) has increased dramatically during the past decade. Many patients with HCC who were beyond the Milan criteria were allowed to receive a liver transplantation (LT) once the HCC was successfully down-staged. This retrospective study aimed to analyze the outcomes of LRTs prior to LT in patients with HCC beyond the Milan criteria. METHODS: We analyzed 56 patients treated from June 2006 to March 2010: 22 met the Milan criteria (T1+T2, 39.3%), 16 had T3 tumors (28.6%), and 11 had T4a tumors (19.6%), while 7 were suspected of tumor vascular invasion (T4b, 12.5%). All patients underwent preoperative LRTs, including transcatheter arterial chemoembolization, radiofrequency ablation, percutaneous ethanol injection, liver resection, and/or microwave coagulation therapy. The number of the patients who were successfully down-staged before LT, the types of LRTs used before LT, and their outcomes after LT were recorded. RESULTS: Eleven patients had necrotic tumors (pT0, 19.6%); 6 had pT1 tumors (10.7%), 22 had pT2 tumors (39.3%), 6 had pT3 tumors (10.7%), 5 had pT4a tumors (8.9%), and 6 had pT4b tumors (10.7%). The histopathologic tumors of 39 patients (69.6%) were down-staged and met the established Milan criteria (pT0-2). Imaging-proven under-staging was present in 5 HCC patients (8.9%) who had tumors involving the intrahepatic venous system. Twenty-three patients (41.1%) had stable HCC and 10 (17.9%) died. The 1-, 3- and 4-year survival rates were 96%, 73% and 61%, respectively, with a mean survival time of 22.29±1.63 months. Six patients died of tumorrecurrence. The 1-, 3- and 4-year recurrence-free survival (RFS) rates were 88%, 75% and 66%, respectively. The 3-year RFS of patients with pT0-2 tumors was 82%, which was markedly greater than that of patients with pT3 tumors (63%, P=0.018) or pT4 tumors (17%, P=0.000). Although the 3-year RFS of patients with pT3 tumors was greater than tha

关键词： hepatocellular carcinoma tumor down-staging loco-regional therapy liver transplantation

Clinical significance of elevating serum CA125 levels in patients

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Clinical significance of elevating serum CA125 levels in pat...

冷速对等温锻造TC25钛合金盘件显微组织和性能的影响

第十五届全国泌尿外科学术会议

作者： YANG Jin-yi, Jiang xin-jin, wei-wei,ye Lin, LIU Jian-guang, Zhang Bo Zong Hai-ying 辽宁省大连市友谊医院泌尿外科

Objective To evaluate the changes and clinical significance of serum CA125 levels in patients with metastatic bladder carcinoma. Methods Serum concentrations of CA125 were examined by means of electrochemiluminescence technique in 58 cases metastatic bladder cancer, 30 cases of superficial ones and 8 cases of other urological conditions. Results Of the 58 patients 39(67.2%) had increased CA125.

关键词： bladder neoplasms , carcinoma CA125 antigen

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钛工业进展 2017年第4期34卷 26-29页

作者：魏鑫叶康源叶俊青中国航发沈阳黎明航空发动机有限责任公司辽宁沈阳110043 贵州安大航空锻造有限责任公司贵州安顺561005

研究了TC25钛合金盘件在β相区等温锻造后,不同的冷却速率对显微组织和力学性能的影响。结果表明,锻后空冷得到粗大的片状组织,并有大块的α相出现;锻后水冷可以获得细小、相互交织的网篮组织,未出现明显的块状α相。与空冷相比,β锻造... 详细信息

研究了TC25钛合金盘件在β相区等温锻造后,不同的冷却速率对显微组织和力学性能的影响。结果表明,锻后空冷得到粗大的片状组织,并有大块的α相出现;锻后水冷可以获得细小、相互交织的网篮组织,未出现明显的块状α相。与空冷相比,β锻造后水冷的盘件室温强度、热暴露后的室温强度以及500℃和550℃的高温强度均有明显提高,塑性基本保持不变或有所提高。可见,TC25钛合金β锻造后水冷是改善强度和塑性的有效方法。

关键词： TC25钛合金 β锻造冷却速率力学性能

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“德主刑辅”与“刑主德辅”——法治在中国

安阳师范学院学报 2006年第3期 55-57页

作者：魏昕烨郑州大学法学院河南郑州450002

中国古代是一个以德治作为具体内容的人治国家。然而当人治的局限性出现之后,中国便开始了漫长的法治路程,并且直到今天仍在延续。实践证明,有利于民主治国,有利于控制权力,法治有利于自由,平等,社会稳定。

关键词：传统德主刑辅人治法治自由平等社会稳定

Thermally activated delayed fluorescence enhanced by macrocyclization

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Science China Chemistry 2025年

作者： Shuo Li Chenghao Zhu Lijun Mao xin Zhang Zecong ye Chunju Li Da Ma School of Pharmaceutical and Chemical Engineering & Institute for Advanced Studies Taizhou University School of Chemical Engineering and Light Industry Guangdong University of Technology Tianjin Key Laboratory of Structure and Performance for Functional Molecules Tianjin Normal University

Thermally activated delayed fluorescence (TADF) depends on reverse intersystem crossing (RISC) from the lowest triplet to the singlet excited state. Here, a macrocyclization strategy is developed to achieve TADF emission by promoting RISC. 5-(9Hcarbazol-9-yl) isophthalonitrile, a fluorescent molecule, is coupled with 1,4-dimethoxybenzene by methylene bridges to form a macrocycle with TADF emission. Experimental results and theoretical calculation indicate that the macrocyclization strategy contributes to RISC promotion and suppression of nonradiative decay, resulting in effective TADF emission transformed from prompt fluorescence. Three TADF luminophores are cyclized with the same strategy, and an enhanced TADF emission of up to3.8 folds is observed. The marriage of macrocycle chemistry and luminescent materials will provide new guidelines for designing efficient TADF materials.

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钢-混凝土结合梁试件降温过程的数值计算与实验研究

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铁道学报 2003年第6期25卷 99-103页

作者：陈焕新刘蔚巍叶梅新中南大学土木建筑学院湖南长沙410075

采用控制容积法建立钢混凝土结合梁试件温度分布的数学模型,并计算了其在降温过程中的温度分布。研制了低温实验装置,对钢混凝土结合梁试件进行了降温实验,将计算与实验结果进行比较,最大偏差为1.5℃,计算结果与实验值吻合良好。研究... 详细信息

采用控制容积法建立钢混凝土结合梁试件温度分布的数学模型,并计算了其在降温过程中的温度分布。研制了低温实验装置,对钢混凝土结合梁试件进行了降温实验,将计算与实验结果进行比较,最大偏差为1.5℃,计算结果与实验值吻合良好。研究表明:降温过程中,试件内部温度分布不均匀,且变化较大,因此在工程实际中,由于气温的变化所产生的温度应力将会给铁路桥梁结构造成危害,值得高度关注。

关键词：钢-混凝土结合梁数值计算温度分布非稳态导热