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Experimental Study of Local Scour Around Four Piles Under Different Attack Angles and Gap Ratios

China Ocean Engineering 2024年第4期38卷 612-624页

作者： LIU Ming-ming TANG guo-qiang JIN Xin GENG Shao-yang School of Architecture and Engineering Liaocheng UniversityLiaocheng 252000China Water-Sediment Regulation and Sand Effective Utilization Special Laboratory of Shandong Provincial Education Department Liaocheng UniversityLiaocheng 252000China State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China College of Electronic Engineering Chengdu University of Information TechnologyChengdu 610225China College of Energy Chengdu University of TechnologyChengdu 610059China

In an effort to investigate and quantify the patterns of local scour,researchers embarked on an in-depth study using a systematic experimental *** research focused on the effects of local scour around a set of four piles,each subjected to different hydromechanical *** particular,this study aimed to determine how different attack angles—the angles at which the water flow impinges on the piles,and gap ratios—the ratios of the spacing between the piles to their diameters,influence the extent and nature of scour.A comprehensive series of 35 carefully designed experiments were orchestrated,each designed to dissect the nuances in how the gap ratio and attack angle might contribute to changes in the local scour observed at the base of pile *** these experimental trials,a wealth of local scour data were collected to support the *** data included precise topographic profiles of the sediment bed around the pile groups,as well as detailed scour time histories showing the evolution of scour at strategic feature points throughout the test *** analysis of the experimental data provided interesting *** study revealed that the interplay between the gap ratio and the attack angle had a pronounced influence on the scouring dynamics of the pile *** of the key observations was that the initial phases of scour,particularly within the first hour of water flow exposure,were characterized by a sharp increase in the scour depth occurring immediately in front of the *** this initial rapid development,the scour depth transitioned to a more gradual change *** contrast,the scour topography around the piles continuously *** suggests that sediment displacement and the associated sculpting of the seabed around pile foundations are sustained and progressive processes,altering the underwater landscape over *** results of this empirical investigation have significant implications for the design and constructio

关键词： local scour piles gap ratio attack angle

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EPDM绝热材料耦合烧蚀模型

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固体火箭技术 2012年第1期35卷 114-117,122页

作者：李强杨飒李江何国强西北工业大学燃烧、流动和热结构国家级重点实验室西安710072

以EPDM类绝热材料烧蚀特性为研究对象,借鉴多孔介质领域的相关理论和方法,以炭化层的孔隙结构特征和参数为纽带,建立了考虑热化学烧蚀、颗粒侵蚀和气流剥蚀的EPDM类绝热材料耦合烧蚀模型,并进行了模型的初步实验验证。结果表明,所建立... 详细信息

以EPDM类绝热材料烧蚀特性为研究对象,借鉴多孔介质领域的相关理论和方法,以炭化层的孔隙结构特征和参数为纽带,建立了考虑热化学烧蚀、颗粒侵蚀和气流剥蚀的EPDM类绝热材料耦合烧蚀模型,并进行了模型的初步实验验证。结果表明,所建立的模型不仅在EPDM类绝热材料烧蚀率预示方面具有较高的计算精度,而且在细管上能够基本反映绝热材料的烧蚀特性。

关键词： EPDM 绝热材料烧蚀耦合模型

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Correlation between longitudinal crack occurrence and mold heat transfer in continuous casting based on process data mining

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Journal of Iron and Steel Research International 2024年第5期31卷 1139-1152页

作者： Zhi-qiang Peng Zi-bing Hou Kai Yi Kun-hui guo Dong-wei guo Guang-hua Wen College of Materials Science and Engineering Chongqing UniversityChongqing400044China Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing400044China

The correlation between the longitudinal crack occurrence and integrated heat transfer of the mold with data mining methods was ***,three kinds of support vector machine models based on principal component analysis with different input features were established to explore the effect of integrated heat transfer on the accuracy of the prediction model for the longitudinal *** results show that the accuracy was improved while features including mean and standard deviation of integrated heat transfer were ***,the difference in integrated heat transfer between defect and normal samples under the same process parameters was quantitatively *** with normal samples,the temperature difference of cooling water for defect samples decreased by 0.65%,and the temperature difference fluctuation increased by 31.1%.Finally,the literature data were used to provide support for the quantitative correlation according to defect formation mechanism.A new criterion for the prediction of longitudinal crack and a discovering method for correlation between product quality and process parameters in the manufacturing industry have been provided.

关键词： Continuous casting slab Longitudinal surface crack heat transfer Data mining Quantitative correlation

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Experimental study on secondary air mixing along the bed height in a circulating fluidized bed with a multitracer-gas method

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Chinese Journal of Chemical Engineering 2024年第6期70卷 54-62页

作者： Qingyu Zhang Leming Cheng Kun Li Qixun Kang qiang guo Chaogang Wu Institute for Thermal Power Engineering State Key Laboratory of Clean Energy UtilizationZhejiang UniversityHangzhou 310027China Dongfang Boiler Group Co.Ltd. Zigong 643001China

A multitracer-gas method was proposed to study the secondary air(SA)mixing along the bed height in a circulating fluidized bed(CFB)using carbon monoxide(CO),oxygen(O_(2)),and carbon dioxide(CO_(2))as tracer *** were carried out on a cold CFB test rig with a cross-section of 0.42 m×0.73 m and a height of 5.50 *** effects of superficial velocity,SA ratio,bed inventory,and particle diameter on the SA mixing were *** results indicate that there are some differences in the measurement results obtained using different tracer gases,wherein the deviation between CO and CO_(2) ranges from 42%to 66%and that between O_(2) and CO_(2) ranges from 45%to 71%in the lower part of the fluidized ***,these differences became less pronounced as the bed height ***,the high solid concentration and fine particle diameter in the CFB may weaken the *** measurement results of different tracer gases show the same trends under the variation of operating *** superficial velocity and SA ratio and decreasing particle diameter result in better mixing of the *** effect of bed inventory on SA mixing is not monotonic.

关键词： Circulating fluidized bed Secondary air injection Gas mixing Multitracer-gas method

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The study of intelligent algorithm in particle identification of heavy-ion collisions at low and intermediate energies

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Nuclear Science and Techniques 2024年第2期35卷 170-182页

作者： Gao-Yi Cheng Qian-Min Su Xi-Guang Cao guo-qiang Zhang School of Electronic and Electrical Engineering Shanghai University of Engineering ScienceShanghai 201620China Shanghai Advanced Research Institute Chinese Academy of SciencesShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

Traditional particle identification methods face timeconsuming,experience-dependent,and poor repeatability challenges in heavy-ion collisions at low and intermediate *** urgently need solutions to the dilemma of traditional particle identification *** study explores the possibility of applying intelligent learning algorithms to the particle identification of heavy-ion collisions at low and intermediate *** intelligent algorithms,including XgBoost and TabNet,were selected to test datasets from the neutron ion multi-detector for reaction-oriented dynamics(NIMROD-ISiS)and Geant4 ***-based machine learning algorithms and deep learning algorithms *** show excellent performance and generalization *** additional data features besides energy deposition can improve the algorithm’s performance when the data distribution is *** learning algorithms can be applied to solve the particle identification problem in heavy-ion collisions at low and intermediate energies.

关键词： heavy-ion collisions at low and intermediate energies Machine learning Ensemble learning algorithm Particle identification Data imbalance

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On the Intelligent Optimization of the Crevice Structure in a Rapid Compression Machine

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Journal of Thermal Science 2024年第3期33卷 1200-1215页

作者： guo qiang LIU Jie WU Yingtao WANG hewu TANG Chenglong YU Ruiguang Department of Power Mechanical Engineering Beijing Jiaotong UniversityBeijing100044China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing100084China Beijing Key Laboratory of New Energy Vehicle Powertrain Technology Beijing100044China National International Science and Technology Cooperation Base Beijing Jiaotong UniversityBeijing100044China

In this study,the multi-objective intelligent optimization of the crevice structure in a rapid compression machine(RCM)is carried out based on the RCM simulation model modified with the KIVA-3V program.A multi-objective optimization simulation model of the crevice structure based on the large eddy simulation model coupled with the genetic algorithm NSGA-Ⅲis *** optimization parameters and seven optimization objectives are selected in the optimization *** results show that the genetic algorithm can quickly find the values of the optimized *** crevice volume ratio shows a trade-off relationship with the dimensionless temperature ratio T_(max)/T_(aver)and the tumble ratio.A larger crevice volume can reduce the flow of boundary layer cryogenic gas into the combustion chamber,thus improving the temperature *** addition,the crevice entrance width and the connecting channel length should be smaller,while the volume of the crevice main chamber should be larger,so as to sufficiently introduce the low-temperature gas of the boundary layer into the crevice and reduce their influence on the temperature field of the combustion *** the crevice volume accounts for10%of the total volume,the temperature uniformity of the combustor is significantly enhanced,and when the crevice volume accounts for 30.4%,there is almost no low-temperature vortex in the combustion chamber.

关键词： rapid compression machine adiabatic core area ignition delay period crevice structure

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A Novel Poly(3-hexylthiophene) Engineered Interface for Electrochemical Monitoring of Ascorbic Acid During the Occurrence of Glutamate-Induced Brain Cytotoxic Edemas

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Research 2024年第1期2023卷 301-313页

作者： Zexuan Meng Yuchan Zhang Lu Yang Shuang Zhao qiang Zhou Jiajia Chen Jiuxi Sui Jian Wang Lizhong guo Luyue Chang Jialing he Guixue Wang Guangchao Zang Institute of Life Science and Laboratory of Tissue and Cell BiologyLab Teaching and Management CenterChongqing Medical UniversityChongqing 400016China Key Laboratory for Biorheological Science and Technology of Ministry of Education State and Local Joint Engineering Laboratory for Vascular ImplantsBioengineering College of Chongqing UniversityChongqing 400030China Jinfeng Laboratory Chongqing 401329China Department of Pathophysiology Chongqing Medical UniversityChongqingChina

Although neuroelectrochemical sensing technology offers unique benefits for neuroscience research,its application is limited by substantial interference in complex brain environments while ensuring biosafety *** this study,we introduced poly(3-hexylthiophene)(P3HT)and nitrogen-doped multiwalled carbon nanotubes(N-MWCNTs)to construct a composite membrane-modified carbon fiber microelectrode(CFME/P3HT-N-MWCNTs)for ascorbic acid(AA)*** microelectrode presented good linearity,selectivity,stability,antifouling,and biocompatibility and exhibited great performance for application in neuroelectrochemical ***,we applied CFME/P3HT-N-MWCNTs to monitor AA release from in vitro nerve cells,ex vivo brain slices,and in vivo living rat brains and determined that glutamate can induce cell edema and AA *** also found that glutamate activated the N-methyl-d-aspartic acid receptor,which enhanced Na^(+) and Cl^(−) inflow to induce osmotic stress,resulting in cytotoxic edema and ultimately AA *** study is the first to observe the process of glutamate-induced brain cytotoxic edema with AA release and to reveal the *** work can benefit the application of P3HT in in vivo implant microelectrode construction to monitor neurochemicals,understand the molecular basis of nervous system diseases,and discover certain biomarkers of brain diseases.

关键词： release microelectrode Engine

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RBCC发动机超燃模态燃料喷射方案数值模拟研究

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固体火箭技术 2013年第6期36卷 736-741页

作者：汤祥何国强秦飞西北工业大学燃烧热结构与内流场重点实验室西安710072

为实现二元结构RBCC发动机引射、亚燃、超燃模态可共存于同一流道中,验证多模态的匹配性,同时获得较优的燃烧性能,通过采用包含3步简化动力学模型的数值模拟方法,研究了燃料喷射位置的变化对发动机燃烧性能的影响。模拟结果表明,采用支... 详细信息

为实现二元结构RBCC发动机引射、亚燃、超燃模态可共存于同一流道中,验证多模态的匹配性,同时获得较优的燃烧性能,通过采用包含3步简化动力学模型的数值模拟方法,研究了燃料喷射位置的变化对发动机燃烧性能的影响。模拟结果表明,采用支板火箭作为点火和火焰稳定源,燃料支板进行燃料喷射可实现RBCC发动机在超音速来流下的有效点火和稳定燃烧;基于燃料支板喷射,同时结合中心支板喷射和隔离段壁面喷射能获得较好的燃烧性能,内推力大小相比燃料支板结合中心支板喷射具有1.35倍的提升;隔离段中的燃料喷射量较多时会导致激波链进一步向上游传播,从而影响发动机的工作性能。

关键词：火箭基组合循环超燃模态燃烧性能数值模拟

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RBCC发动机海平面零速引射模态流场数值模拟(英文)

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固体火箭技术 2013年第3期36卷 310-317页

作者：石磊何国强秦飞西北工业大学燃烧、热结构与内流场重点实验室西安710072

针对中心支板式火箭基组合循环(RBCC)发动机在海平面零速引射模态下进排气系统与双模态燃烧室匹配工作时的情况进行了数值模拟,并详细分析了其流场特征。结果发现,计算网格的划分以及边界条件的设置对数值模拟的合理性和可信度有着重要... 详细信息

针对中心支板式火箭基组合循环(RBCC)发动机在海平面零速引射模态下进排气系统与双模态燃烧室匹配工作时的情况进行了数值模拟,并详细分析了其流场特征。结果发现,计算网格的划分以及边界条件的设置对数值模拟的合理性和可信度有着重要的影响;与通常情况不同,零速引射模态下由于唇口附近背风区内流动分离以及低速涡流的出现,进气道的气动流道型面与其物理构型不再一致,由此带来了气体流动过程、空气引射量乃至发动机性能的改变。推而广之,该文说明了在进行RBCC发动机引射模态流场特征及其性能研究时发动机一体化计算的重要性和必要性。

关键词： RBCC发动机引射模态零速流场数值模拟

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Colo-colonic intussusception as a rare complication of colonoscopy with polypectomy: Two case reports

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World Journal of Gastrointestinal Surgery 2024年第6期16卷 1939-1947页

作者： Sai-heng Xiang guo-qiang Xu Department of Gastroenterology The First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Colonoscopy is the most frequently used diagnostic and therapeutic tool for the treatment of colorectal *** the complication rate is low,it can be potentially *** is a rare and severe complication often associated with *** a handful of post-colonoscopy intussusception cases have been reported,making this study a valuable addition to the medical *** SUMMARY Case 1:A 61-year-old man underwent colonoscopy with polypectomy for chronic abdominal *** patient experienced abdominal pain 11 hours later but was still discharged after pain *** was readmitted due to recurring *** tomography(CT)showed colo-colonic *** conservative management and attempts at endoscopic reduction failed;therefore,laparoscopic right hemicolectomy was *** examination revealed tubular adenomas in the polyps and inflammation in the resected *** 2:A 59-year-old woman underwent colonoscopy with polypectomy for a polyp in the transverse *** experienced upper abdominal pain,fever,nausea,and vomiting 9 hours after the *** CT and blood tests revealed a colo-colonic intussusception near the hepatic flexure and an elevated white blood cell *** attempts at endoscopic reduction failed and conservative treatment showed no *** underwent successful laparoscopic reduction and recovered *** examination of the resected polyp revealed *** Post-colonoscopy intussusception in adults is rare,and polypectomy may contribute to its *** diagnosis is crucial,with prompt CT examination serving as *** excluding malignancies,conservative management and reduction of intussusception should be considered before surgical bowel resection.

关键词： Intussusception Colonoscopy Polypectomy Complication Case report

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