Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022043377
A. Konstantinidis, E.С. Aifantis
{"title":"Gradients and Internal Lengths in Small Scale Problems of Mechanics","authors":"A. Konstantinidis, E.С. Aifantis","doi":"10.1615/intjmultcompeng.2022043377","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022043377","url":null,"abstract":"","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67460720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022043544
İsmail Kayadibi, Gür Emre Güraksın
{"title":"An early retinal disease diagnosis system using OCT images via CNN-based stacking ensemble learning","authors":"İsmail Kayadibi, Gür Emre Güraksın","doi":"10.1615/intjmultcompeng.2022043544","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022043544","url":null,"abstract":"","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67460892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022045250
N. Fantuzzi, Somnath Ghosh, T. Sadowski, B. Schrefler
{"title":"Preface: Multiscale Mechanical Modelling of “Complex” Materials and Engineering Applications. Dedicated to the 60th Birthday of Patrizia Trovalusci","authors":"N. Fantuzzi, Somnath Ghosh, T. Sadowski, B. Schrefler","doi":"10.1615/intjmultcompeng.2022045250","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022045250","url":null,"abstract":"","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67460921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022045251
G. Rega, N. Fantuzzi
After spending nearly 20 years at the School of Engineering o f the University of L’Aquila, where I made all the main initial steps of my academic career, in 1995, I returned to the Sapienza University of Rome, which were my home university and my native city, respectively. L’Aquila w s a highly rewarding experience of scientific growth and personal maturation. Yet, it was also quite a demanding time because of my wife, professor at the Academy of Fine Arts of Naples, and my two kids living in Rome. Probably, fore ign colleagues accustomed to a great permeability between different universities and hosting cities will be a mazed by this observation. But, the Italian social, cultura , and academic environment has always been characterized by a strong sense of local identity, in particular when the original place of scientific activity was a prestigious u niversity (a perception which, luckily, has almost entirel y vanished in recent decades). At the branch of the Department of Structural and Geotechnic al Engineering of the School of Architecture of Rome, I found Patrizia Trovalusci, a fine and highly motivate d young researcher (a tenured position equivalent to an assistant professor) whom I had already met at a couple of con ferences, and who had received her PhD degree three years before. Being quite inexperienced of the peculiar env iro ment of a school of architecture, I did my best for not moving there like an elephant in a crystal shop, and I subs tantially succeeded in this. In particular, I paid strong attention in not exerting the academic power of a new profess r, appointed to establish a quality team in solid and structural mechanics, for bringing the richness, but also t he “weight” and complexity, of my scientific background in nonlinear dynamics of structures and mechanical systems into an environment substantially unaware of them and instead promisingly active in a different field. This was esp ecially true as regards my “assistant” Patrizia, who was just coauthoring some interesting papers on continuum mode ls f masonry, along with an older colleague. In the few years to come, I took some nontrivial effort to properly gras p how much potential was indeed embedded in the more general research program on micropolar and classical conti nua for anisotropic discontinuous materials, which Patriz i was progressively and fruitfully working on. And indeed, ca tching the importance of promoting and supporting an unprecedented, even if quantitatively minimal, quality gr oup also in a different area of research, I maintained the poi nt of not reorienting Patrizia’s scientific activity towards t he completely new area of nonlinear and chaotic dynamics, leaving her full freedom of choice and responsibility in thi s respect. As a matter of fact, this was (and still is) my conceptual position about the correct way to foster the adva ncement of research in whatever scientific environment. I made such a choice despite the high qualities of Patrizia
在拉奎拉大学工程学院度过了近20年之后，我在1995年回到了罗马Sapienza大学，这分别是我的家乡大学和我的家乡城市。我在那里完成了我学术生涯的所有主要最初步骤。拉奎拉是一次非常有益的科学成长和个人成熟的经历。然而，这段时间也很辛苦，因为我的妻子是那不勒斯美术学院的教授，我的两个孩子住在罗马。也许，习惯了不同大学和主办城市之间高度渗透的外国同事会对这一观察结果感到困惑。但是，意大利的社会、文化和学术环境一直以强烈的地方认同感为特征，特别是当科学活动的最初地点是一所著名的大学时(幸运的是，这种观念在最近几十年几乎完全消失了)。在罗马建筑学院结构与岩土工程系的分院，我找到了Patrizia Trovalusci，她是一位优秀且非常积极的年轻研究员(终身职位相当于助理教授)，我已经在几次会议上见过她，她在三年前获得了博士学位。由于对建筑学院的特殊环境缺乏经验，我尽量不像一头大象进了水晶店一样搬到那里去，而且我基本上做到了。特别是，我非常注意不发挥一个新教授的学术权力，我被任命建立一个固体和结构力学的质量团队，把我在结构和机械系统非线性动力学方面的科学背景的丰富性，以及“重量”和复杂性带到一个基本上不了解它们的环境中，而不是活跃在一个不同的领域。对于我的“助手”Patrizia来说尤其如此，她刚刚与一位年长的同事共同撰写了一些关于连续模式砌体的有趣论文。在接下来的几年里，我花了一些不平凡的努力，以适当地了解在各向异性不连续材料的微极和经典连续的更一般的研究项目中确实有多大的潜力，Patriz在这方面的工作是逐步和富有成果的。事实上，考虑到在不同的研究领域促进和支持一个前所未有的、即使数量很少的高质量群体的重要性，我坚持认为，不要将Patrizia的科学活动重新定向到非线性和混沌动力学的全新领域，让她在这方面有充分的选择和责任自由。事实上，这是(现在仍然是)我对在任何科学环境中促进研究进步的正确方法的概念立场。我做了这样的选择,尽管Patrizia的高品质作为一个科学家,我容易理解,尽管有些胆小,甚至fearful-attempts在她这边参与我参考的科学领域,甚至完全未知的她,尽管我强烈需要创建一个ne w d合格的本地团队在非线性动力学可能取代国际知名的est abli hed,主持在拉奎拉,直到放弃个人的遗憾。在后一方面，我含蓄而又慷慨地选择了像一个流亡的科学家一样生活在自己的国家，使自己适应于只与外部的人寻求科学合作，无论他们是来自我的新部门的工程部门(然而，相当封闭和排他性)还是来自其他大学，或来自国际关系。当然，我清楚地向Patrizia表达了我对她的科学信心，提供了给她自由选择的原因，甚至我自己也向她的研究领域迈出了几步，即使只是在有限的程度上考虑到我在非线性动力学领域的承诺的数量和丰富:在第一阶段，我们关注的是一些有趣的“软”问题，比如力学(实体和结构)、应用数学和(历史和当代)建筑设计之间的关系，幸运的是，我们没有关注这些问题
{"title":"Patrizia Trovalusci: An Open-Minded Scholar of Mechanics, an Architect, a Determined Woman","authors":"G. Rega, N. Fantuzzi","doi":"10.1615/intjmultcompeng.2022045251","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022045251","url":null,"abstract":"After spending nearly 20 years at the School of Engineering o f the University of L’Aquila, where I made all the main initial steps of my academic career, in 1995, I returned to the Sapienza University of Rome, which were my home university and my native city, respectively. L’Aquila w s a highly rewarding experience of scientific growth and personal maturation. Yet, it was also quite a demanding time because of my wife, professor at the Academy of Fine Arts of Naples, and my two kids living in Rome. Probably, fore ign colleagues accustomed to a great permeability between different universities and hosting cities will be a mazed by this observation. But, the Italian social, cultura , and academic environment has always been characterized by a strong sense of local identity, in particular when the original place of scientific activity was a prestigious u niversity (a perception which, luckily, has almost entirel y vanished in recent decades). At the branch of the Department of Structural and Geotechnic al Engineering of the School of Architecture of Rome, I found Patrizia Trovalusci, a fine and highly motivate d young researcher (a tenured position equivalent to an assistant professor) whom I had already met at a couple of con ferences, and who had received her PhD degree three years before. Being quite inexperienced of the peculiar env iro ment of a school of architecture, I did my best for not moving there like an elephant in a crystal shop, and I subs tantially succeeded in this. In particular, I paid strong attention in not exerting the academic power of a new profess r, appointed to establish a quality team in solid and structural mechanics, for bringing the richness, but also t he “weight” and complexity, of my scientific background in nonlinear dynamics of structures and mechanical systems into an environment substantially unaware of them and instead promisingly active in a different field. This was esp ecially true as regards my “assistant” Patrizia, who was just coauthoring some interesting papers on continuum mode ls f masonry, along with an older colleague. In the few years to come, I took some nontrivial effort to properly gras p how much potential was indeed embedded in the more general research program on micropolar and classical conti nua for anisotropic discontinuous materials, which Patriz i was progressively and fruitfully working on. And indeed, ca tching the importance of promoting and supporting an unprecedented, even if quantitatively minimal, quality gr oup also in a different area of research, I maintained the poi nt of not reorienting Patrizia’s scientific activity towards t he completely new area of nonlinear and chaotic dynamics, leaving her full freedom of choice and responsibility in thi s respect. As a matter of fact, this was (and still is) my conceptual position about the correct way to foster the adva ncement of research in whatever scientific environment. I made such a choice despite the high qualities of Patrizia ","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67460931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022043259
V. Eremeyev, E. Reccia
{"title":"On Dynamics of Elastic Networks with Rigid Junctions within Nonlinear Micropolar Elasticity","authors":"V. Eremeyev, E. Reccia","doi":"10.1615/intjmultcompeng.2022043259","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022043259","url":null,"abstract":"","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"1 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67460952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-01-01DOI: 10.1615/intjmultcompeng.2022042413
A. Cutolo, F. Guarracino, C. Olivieri, Ida Mascolo
Following previous work by some of the present authors based on the linear arch static analysis (LASA), which models the masonry material as a no-tension material according to Heyman (Heyman, J., The Stone Skeleton, Int. J. Solids Struct., vol. 2, no. 2, pp. 249-279, 1966) and on the safe theorem of the limit analysis (LA), an in-depth numerical study of a case study based on a masonry spiral staircase in Nisida, near Naples, is here presented by means of an accurate finite element (FE) model. The nonlinear FE model has been obtained by the use of the ANSYS Parametric Design Language (APDL), and a precise representation of all the material involved and of the boundary conditions, has been obtained. The results confirm that LASA can be an alternative to much more complex numerical analyses, such as FE, but it cannot account for the main cause of collapse or stress redistribution in these type of structures, that is sagging and subsidences. The results are presented and discussed in some detail.
根据海曼(Heyman, J.， the Stone Skeleton, Int.)的说法，一些现任作者基于线性拱门静力分析(LASA)的先前工作，将砌体材料建模为无张力材料。J.固体结构。，第2卷，第2期。2, pp. 249-279, 1966)和极限分析的安全定理(LA)，在此通过精确有限元(FE)模型，对那不勒斯附近Nisida砌体螺旋楼梯的案例进行了深入的数值研究。利用ANSYS参数化设计语言(APDL)建立了非线性有限元模型，得到了所涉及的所有材料和边界条件的精确表示。结果证实，LASA可以替代更复杂的数值分析，如有限元，但它不能解释坍塌或应力重新分布的主要原因，在这些类型的结构，即下垂和沉降。本文对结果进行了详细的介绍和讨论。
{"title":"NONLINEAR FE ANALYSIS OF A MASONRY SPIRAL STAIRCASE IN NISIDA: A REFINED NUMERICAL CASE STUDY","authors":"A. Cutolo, F. Guarracino, C. Olivieri, Ida Mascolo","doi":"10.1615/intjmultcompeng.2022042413","DOIUrl":"https://doi.org/10.1615/intjmultcompeng.2022042413","url":null,"abstract":"Following previous work by some of the present authors based on the linear arch static analysis (LASA), which models the masonry material as a no-tension material according to Heyman (Heyman, J., The Stone Skeleton, Int. J. Solids Struct., vol. 2, no. 2, pp. 249-279, 1966) and on the safe theorem of the limit analysis (LA), an in-depth numerical study of a case study based on a masonry spiral staircase in Nisida, near Naples, is here presented by means of an accurate finite element (FE) model. The nonlinear FE model has been obtained by the use of the ANSYS Parametric Design Language (APDL), and a precise representation of all the material involved and of the boundary conditions, has been obtained. The results confirm that LASA can be an alternative to much more complex numerical analyses, such as FE, but it cannot account for the main cause of collapse or stress redistribution in these type of structures, that is sagging and subsidences. The results are presented and discussed in some detail.","PeriodicalId":50350,"journal":{"name":"International Journal for Multiscale Computational Engineering","volume":"55 9","pages":""},"PeriodicalIF":1.4,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138513214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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