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Computational Fluid Dynamics Approach for Predicting Pipeline Response to Various Blast Scenarios: A Numerical Modeling Study

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 2747-2777页

作者： Farman Saifi Mohd Javaid Abid Haleem S.M.Anas Department of Mechanical Engineering Jamia Millia Islamia(A Central University)New Delhi110025India Department of Civil Engineering Jamia Millia Islamia(A Central University)New Delhi110025India

Recent industrial explosions globally have intensified the focus in mechanical engineering on designing infras-tructure systems and networks capable of withstanding blast *** centered on high-profile facilities such as embassies and petrochemical plants,this concern now extends to a wider array of infrastructures and *** and scholars increasingly prioritize structural safety against explosions,particularly to prevent disproportionate collapse and damage to nearby *** has further amplified the reliance on oil and gas pipelines,making them vital for urban life and prime targets for terrorist ***,there is a growing imperative for computational engineering solutions to tackle blast loading on pipelines and mitigate associated risks to avert *** this study,an empty pipe model was successfully validated under contact blast conditions using Abaqus software,a powerful tool in mechanical engineering for simulating blast effects on buried *** a Eulerian-Lagrangian computational fluid dynamics approach,the investigation extended to above-surface and below-surface blasts at standoff distances of 25 and 50 *** descriptions in the numerical model relied on Abaqus’default mechanical *** analysis revealed varying pipe performance,with deformation decreasing as explosion-to-pipe distance *** explosion’s location relative to the pipe surface notably influenced deformation levels,a key finding highlighted in the ***,quantitative findings indicated varying ratios of plastic dissipation energy(PDE)for different blast scenarios compared to the contact blast(P0).Specifically,P1(25 mm subsurface blast)and P2(50 mm subsurface blast)showed approximately 24.07%and 14.77%of P0’s PDE,respectively,while P3(25 mm above-surface blast)and P4(50 mm above-surface blast)exhibited lower PDE values,accounting for about 18.08%and 9.67%of P0’s PDE,***

关键词： Blast loading computational fluid dynamics computer modeling pipe networks response prediction structural safety

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Effectiveness of hybrid ensemble machine learning models for landslide susceptibility analysis:Evidence from Shimla district of North-west Indian Himalayan region

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Journal of Mountain Science 2024年第7期21卷 2368-2393页

作者： SHARMA Aastha SAJJAD Haroon RAHAMAN Md Hibjur SAHA Tamal Kanti BHUYAN Nirsobha Department of Geography Faculty of SciencesJamia Millia IslamiaNew Delhi-110025India

The Indian Himalayan region is frequently experiencing climate change-induced ***,landslide susceptibility assessment assumes greater significance for lessening the impact of a landslide *** paper makes an attempt to assess landslide susceptibility in Shimla district of the northwest Indian Himalayan *** examined the effectiveness of random forest(RF),multilayer perceptron(MLP),sequential minimal optimization regression(SMOreg)and bagging ensemble(B-RF,BSMOreg,B-MLP)models.A landslide inventory map comprising 1052 locations of past landslide occurrences was classified into training(70%)and testing(30%)*** site-specific influencing factors were selected by employing a multicollinearity *** relationship between past landslide occurrences and influencing factors was established using the frequency ratio *** effectiveness of machine learning models was verified through performance *** landslide susceptibility maps were validated by the area under the receiver operating characteristic curves(ROC-AUC),accuracy,precision,recall and *** key performance metrics and map validation demonstrated that the BRF model(correlation coefficient:0.988,mean absolute error:0.010,root mean square error:0.058,relative absolute error:2.964,ROC-AUC:0.947,accuracy:0.778,precision:0.819,recall:0.917 and F-1 score:0.865)outperformed the single classifiers and other bagging ensemble models for landslide *** results show that the largest area was found under the very high susceptibility zone(33.87%),followed by the low(27.30%),high(20.68%)and moderate(18.16%)susceptibility *** factors,namely average annual rainfall,slope,lithology,soil texture and earthquake magnitude have been identified as the influencing factors for very high landslide *** texture,lineament density and elevation have been attributed to high and moderate ***,the study calls for devising suitable landslide mitig

关键词： Landslide susceptibility Site-specific factors Machine learning models Hybrid ensemble learning Geospatial techniques Himalayan region

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Dynamics analysis and cryptographic implementation of a fractional-order memristive cellular neural network model

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Chinese Physics B 2024年第4期33卷 418-433页

作者：周新卫蒋东华 Jean De Dieu Nkapkop Musheer Ahmad Jules Tagne Fossi Nestor Tsafack 吴建华 Department of Information Engineering Gongqing CollegeNanchang UniversityJiujiang 332020China School of Computer Science and Engineering Sun Yat-Sen UniversityGuangzhou 511400China Department of Electrical Engineering and Industrial Computing University Institute of TechnologyDoualaCameroon Department of Computer Engineering Jamia Millia IslamiaNew Delhi 110025India Department of Physics Faculty of ScienceUniversity of YaoundeCameroon Electrical Engineering Department and Industrial Computing of ISTAMA University of DoualaDoualaCameroon

Due to the fact that a memristor with memory properties is an ideal electronic component for implementation of the artificial neural synaptic function,a brand-new tristable locally active memristor model is first proposed in this ***,a novel four-dimensional fractional-order memristive cellular neural network(FO-MCNN)model with hidden attractors is constructed to enhance the engineering feasibility of the original CNN model and its ***,its hardware circuit implementation and complicated dynamic properties are investigated on multi-simulation ***,it is used toward secure communication application *** it as the pseudo-random number generator(PRNG),a new privacy image security scheme is designed based on the adaptive sampling rate compressive sensing(ASR-CS)***,the simulation analysis and comparative experiments manifest that the proposed data encryption scheme possesses strong immunity against various security attack models and satisfactory compression performance.

关键词： cellular neural network memristor hardware circuit compressive sensing privacy data protection

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不同位置的金属微粒对GIS隔离开关电场的影响分析

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高压电器 2024年第8期60卷 113-119页

作者：沈丰慧高洋陈宇新东北电气集团高压开关有限公司沈阳电力科技开发分公司沈阳110025

隔离开关作为GIS的重要组成部件,如果有金属微粒等异物存在,将对隔离开关的绝缘性能产生影响。因此,计算GIS隔离开关带金属微粒时的电场分布至关重要。文中采用三维有限元分析计算方法对隔离开关无金属微粒和不同位置带金属微粒两种工... 详细信息

隔离开关作为GIS的重要组成部件,如果有金属微粒等异物存在,将对隔离开关的绝缘性能产生影响。因此,计算GIS隔离开关带金属微粒时的电场分布至关重要。文中采用三维有限元分析计算方法对隔离开关无金属微粒和不同位置带金属微粒两种工况进行了电场强度计算。对比计算结果可知,屏蔽罩表面附着金属微粒所产生的电场畸变最为严重,绝缘拉杆表面和SF6气体中的金属微粒也会大大增加场强值,导致隔离开关极易放电。基于电场分析所得的计算结果,文中对隔离开关的生产和安装提出了合理的建议。

关键词：隔离开关金属微粒有限元法电场强度

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流动注射在线分析法测定水源水中亚硝酸盐氮

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中国口岸科学技术 2024年第5期6卷 87-90页

作者：贺舒文辽宁通正检测有限公司沈阳110025

本文拟建立流动注射在线分析法测定水源水中亚硝酸盐氮含量的方法。实验样品中的亚硝酸盐通过N-(1-萘基)-乙二胺盐酸盐与磺胺发生重氮反应,生成可溶于水的紫红色化合物,在波长520 nm处检测,发现水源水中的亚硝酸盐氮含量与吸光度成正比... 详细信息

本文拟建立流动注射在线分析法测定水源水中亚硝酸盐氮含量的方法。实验样品中的亚硝酸盐通过N-(1-萘基)-乙二胺盐酸盐与磺胺发生重氮反应,生成可溶于水的紫红色化合物,在波长520 nm处检测,发现水源水中的亚硝酸盐氮含量与吸光度成正比。水源水中亚硝酸盐氮在0.000~10.0 mg/L范围内线性关系良好,相关系数大于0.999,检出限为0.005 mg/L,测定下限为0.010 mg/L,加标回收率为90.0%~103%,相对标准偏差为1.21%~7.61%。结果表明,该方法操作方便,具有较好的重复性和准确度,能够满足水源水检测的相关要求。

关键词：流动注射水源水亚硝酸盐氮

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Deciphering the iron enigma: Navigating the complexities of iron metabolism in critical illness

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World Journal of Clinical Cases 2024年第27期12卷 6027-6031页

作者： Anjali Mishra Deven Juneja Department of Critical Care Medicine Holy Family HospitalDelhi 110025India Department of Critical Care Medicine Max Super Speciality HospitalNew Delhi 110017India

Iron is a double-edged sword!Despite being essential for numerous physiological processes of the body,a dysregulated iron metabolism can result in tissue da-mage,exaggerated inflammatory response,and increased susceptibility to infection with certain pathogens that thrive in iron-rich *** sepsis,there is an alteration of iron metabolism,leading to increased transport and uptake into *** increase in labile iron may cause oxidative damage and cellular injury(ferroptosis)which progresses as the disease *** ill patients are often complicated with systemic inflammation which may contribute to multiple organ dysfunction syndrome or sepsis,a common cause of mortality in intensive care ***,ferritin was known to play an important role in the hematopoietic system for its iron storage ***,its role has emerged as a predictor of poor prognosis in chronic inflammation and critical *** from predicting the disease outcome,serum ferritin can poten-tially reflect disease activity as well.

关键词： Critical illness Ferritin Inflammation Iron Mortality Sepsis

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基于防雷监测系统的地电位反击判断方法

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铁道通信信号 2024年第7期60卷 28-33页

作者：陈超沈阳铁路信号有限责任公司沈阳110025

地电位反击是雷电入侵方式之一,由于地电位反击的特点尚未明确,并且机械室对于地电位反击引起的雷电灾害并没有针对性的防护方法,为此提出一种在防雷监测系统基础上的地电位反击判断方法。通过分析采集的雷电信号,结合流程图判断是否发... 详细信息

地电位反击是雷电入侵方式之一,由于地电位反击的特点尚未明确,并且机械室对于地电位反击引起的雷电灾害并没有针对性的防护方法,为此提出一种在防雷监测系统基础上的地电位反击判断方法。通过分析采集的雷电信号,结合流程图判断是否发生地电位反击,并精准有效地提出防雷措施优化建议:如果新建机械室,则需在距离机械室15 m以上的位置架设通信杆塔;如果机械室与通信杆塔已建成,距离已无法满足15 m以上,则需断开二者的接地网,并在防雷薄弱点加装浪涌保护器或防雷隔离变压器,以达到提升铁路信号设备可靠性的目的。通过试验站的典型案例,验证了该方法的有效性。

关键词：地电位反击机械室雷电流雷电压中继站判断方法防护措施

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板载继电器寿命测试系统设计与实现

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铁路通信信号工程技术 2024年第1期21卷 103-107页

作者：王鑫赵兴海姚旺沈阳铁路信号有限责任公司沈阳110025

为实际测试板载继电器是否能够达到使用期限的要求,提高板载继电器产品的稳定性和可靠性,设计基于嵌入式的板载继电器寿命测试系统对板载继电器的机械寿命和电气寿命进行测试。在系统结构方面,分为下位机和上位机两部分,下位机以嵌入式... 详细信息

为实际测试板载继电器是否能够达到使用期限的要求,提高板载继电器产品的稳定性和可靠性,设计基于嵌入式的板载继电器寿命测试系统对板载继电器的机械寿命和电气寿命进行测试。在系统结构方面,分为下位机和上位机两部分,下位机以嵌入式系统为基础,通过主控模块完成对板载继电器的驱动及外围逻辑电路的搭建,对动作过程中待测继电器的接点状态进行采集并将故障信息进行编码,通过RS-232通信方式将故障编码信息传输给上位机。上位机采用C#编程语言进行设计,具有对故障编码信息进行存储、分析与显示等功能。最后,通过系统联调实验验证此系统在信息采集、数据通信以及故障诊断等方面的可行性和实用性。

关键词：板载继电器寿命测试故障诊断 RS-232通信嵌入式

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Nonlinear Study on the Mechanical Performance of Built-Up Cold-Formed Steel Concrete-Filled Columns under Compression

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 3435-3465页

作者： Oulfa Harrat Yazid Hadidane S.M.Anas Nadhim Hamah Sor Ahmed Farouk Deifalla Paul O.Awoyera Nadia Gouider Civil Engineering Laboratory Faculty of TechnologyDepartment of Civil EngineeringBadji Mokhtar-Annaba UniversityP.O.Box 12Annaba23000Algeria Department of Civil Engineering Faculty of Engineering and TechnologyJamia Millia Islamia(A Central University)New Delhi110025India Civil Engineering Department University of GarmianKalar46021Iraq Department of Civil Engineering Harran UniversitySanliurfa63510Turkey Structural Engineering and Construction Management Department Future University in EgyptNew Cairo11835Egypt Department of Civil Engineering Covenant UniversityOta112233Nigeria

Given their numerous functional and architectural benefits,such as improved bearing capacity and increased resistance to elastic instability modes,cold-formed steel(CFS)built-up sections have become increasingly developed and used in recent years,particularly in the construction *** paper presents an analytical and numerical study of assembled CFS two single channel-shaped columns with different slenderness and configurations(backto-back,face-to-face,and box).These columns were joined by double-row rivets for the back-to-back and box configurations,whereas they were welded together for the face-to-face *** built-up columns were filled with ordinary concrete of good *** element models were applied,using ABAQUS software,to assess mechanical performance and study the influence of assembly techniques on the behavior of cold-formed columns under axial *** approaches based on Eurocode 3 and Eurocode 4 recommendations for un-filled and concrete-filled columns respectively were followed for the numerical analysis,and concrete confinement effects were also considered per American Concrete Institute(ACI)standards for face-to-face and box *** obtained results indicated a good correlation between the numerical results and the proposed analytical methodology which did not exceed 8%.The failure modes showed that the columns failed due to instabilities such as local and global buckling.

关键词： Cold-formed steel built-up sections slenderness rivets welded axial compression analytical approaches confinement buckling

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252 kV环保型GIS双断口真空断路器并联电容的电场分析计算

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高压电器 2024年第9期60卷 114-125页

作者：吴文海吴晟玮沈丰慧刘波高洋王瑶赵俊卿新东北电气集团高压开关有限公司沈阳110025 辽宁高压电器产品质量检测有限公司沈阳110027

文中设计了两种新型252 kV环保型GIS双断口真空断路器均压结构形式,采用双断口真空灭弧室每断口并联一根电容或两根电容两种不同的均压方式,通过对不同均压方式计算电场值对比分析,得出了双断口真空断路器不同的均压方式对主要部件电场... 详细信息

文中设计了两种新型252 kV环保型GIS双断口真空断路器均压结构形式,采用双断口真空灭弧室每断口并联一根电容或两根电容两种不同的均压方式,通过对不同均压方式计算电场值对比分析,得出了双断口真空断路器不同的均压方式对主要部件电场的影响规律。计算结果表明:真空灭弧室并联单根电容的均压方式只会减小断口间的不均匀系数,但是对屏蔽罩和触头的电场强度降低不明显,而两根单电容串联的均压方式不仅减小断口不均匀系数且降低了真空灭弧室内悬浮屏蔽罩之间的电位差值,使电位分布更均匀,降低屏蔽罩及触头场强值,相对于并联单电容的均压方式触头最大场强值降低了25.78%。

关键词：真空灭弧室悬浮电位均压电容电场强度

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