Double controller of wind induced bending oscillations in telecom towers

Battista, Ronaldo C.,Pfeil, Michele S.,Carvalho, Eliane M.L.,Varela, Wendell D. Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.1

Wind induced large bending oscillation amplitudes in tall and slender telecommunication steel towers may lead to precocious fatigue cracks and consequent risk of collapse of these structures, many of them installed in rural areas alongside highways and in highly populated urban areas. Varying stress amplitudes at hot spots may be attenuated by means of passive control mechanical devices installed in the tower. This paper gives an account of both mathematical-numerical model and the technique applied to design and evaluate the performance of a double controller installed in existing towers which is composed by a nonlinear pendulum and a novel type of passive controller described herein as a planar motion disk mounted on shear springs. Results of experimental measurements carried out on two slender tubular steel towers under wind action demonstrate the efficiency of the double controllers in attenuating the towers bending oscillation amplitudes and consequent stress amplitudes extending the towers fatigue life.

Mixed Adenoneuroendocrine Gastric Carcinoma: A Case Report and Review of the Literature

Giovanni Battista Levi Sandri,Fabio Carboni,Mario Valle,Alfredo Garofalo,Paolo Visca 대한위암학회 2014 Journal of gastric cancer Vol.14 No.1

We present a rare case of a gastric mixed adenoneuroendocrine tumor and review the related English literature. A 77-year-old Caucasian woman was admitted to our department with nausea, anorexia, weight loss, and anemia. Esophagogastroduodenoscopy showed a large (>7 cm) ulcerative mass in the greater curvature of the stomach. Biopsy showed the presence of an adenocarcinoma with moderate differentiation. The patient underwent D2 subtotal gastrectomy. Histopathological analysis revealed a diagnosis of mixed gastric adenoneuroendocrine carcinoma. The post-operative course was uneventful, and at the 6-month follow-up, the patient was alive without evidence of recurrence. Our review of the English literature suggested that such cases are most often reported from eastern countries. Multimodal treatment should be the aim for these patients because of the neuroendocrine component of the tumor.

The EEC-ACP Conventions and Arbitration Problems

Giovanni Battista Goletti 한국법학원 1987 저스티스 Vol.20 No.-

RCCM Canons

Alba Francesca Battista(알바 프란체스카 바티스타),Nicola Monopoli(니콜라 모노폴리) 한국전자음악협회 2015 에밀레 Vol.13 No.-

최대 범주의 규칙 보완적 카논Regular Complementary Canons of Maximal Category (RCCM) 혹은 뷰자 카논Vuza canons은 댄 튜더 뷰자Dan Tudor Vuza가 1990년대 피엔엠Perspectives of New Music 저널에 괄목할만한 논문을 발표하면서 음악계에 소개되었다. 그의 독창적인 견해가 알려진 후 이 중대한 개념은 많은 발전과 대중화 과정을 거쳤다. 음악가들은 늘 캐논의 구성에 많은 관심을 가지고, 플랑드르악파인 조스캥 데프레Josquin Desprez의 복합다성음악이나 요한 세바스찬 바하Johann Sebastian Bach의 대위 기법의 특성들은 공식적인 대수학algebraic 용어로 설명된다. 올리비에 메시앙Olivier Messiaen이 아마 처음으로 리듬 카논의 개념을 소개하고 연구한 이론가 겸 작곡가일 것이다. 수학적 관점에서 봤을 때, 리듬 카논의 구성은 다른 20세기 작곡가들처럼 메시앙도 몰랐을 개념인 두 하위집합의 합으로서 유한하게 순환하는 그룹들의 인수분해로 공식화될 수 있을 것이다. 요즈음 모자이크 카논mosaic canons을 만드는 과정에는 프로그래밍 언어가 적용될 수 있다: 작곡가들이 창조적 음악 작품을 지을 때 형식적 시스템formal architectures의 기초로 이를 활용하여 극도로 복잡하고 거대한 구조를 다룰 수 있다. 이 글에서는 프랑크 예드르제브스키Franck Jedrzejewski의 것에서 비롯된, 작곡가가 알시시엠 카논을 만들고 직접 다룰 수 있게 해주는 알고리듬으로 울프람 매스마티카Wolfram Mathematica에서 저자들이 시행한 것을 보여주고자 한다. 덧붙여 이 알고리듬은 실시간 공간화를 위한 특정 패턴을 구성하는 데 사용된다. Regular Complementary Canons of Maximal Category (RCCM) or Vuza canons were introduced to the musical world with Dan Tudor Vuza’s seminal papers in PNM in the 1990s. Since their original exposition, this important notion has known many developments and generalizations. Musicians have always been intrigued by canon construction, q.v. the complex polyphony of the Flemish composer Josquin Desprez or the contrapuntal techniques of Johann Sebastian Bach, whose properties have been translated into formal algebraic terms. Olivier Messiaen is maybe the first theorist and composer who introduced and studied the concept of rhythmic canon. From a mathematical point of view, the construction of rhythmic canons is formalized in terms of factorizations of finite cyclic groups as the sum of two subsets, a concept that probably Messiaen, like many other composers of the twentieth century, did not know. Nowadays the process of building mosaic canons can be implemented using programming languages: composers can access extremely complex macro-structures that can be taken as the basis for formal architectures of original music compositions. In this paper, we would like to show our implementation in Wolfram Mathematica, with an algorithm, that moves from the Franck Jedrzejewski one, which allows the composer to create and directly manage RCCM Canons. In addition, we use our algorithm to construct special patterns for real-time spatialization.

A system of multiple controllers for attenuating the dynamic response of multimode floor structures to human walking

Ronaldo C. Battista,Wendell D. Varela 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.23 No.5

Composite floor structures formed by continuous slab panels may be susceptible to excessive vibrations, even when properly designed in terms of ultimate limit state criteria. This is due to the inherent vibration characteristics of continuous floor slabs composed by precast orthotropic reinforced concrete panels supported by steel beams. These floor structures display close spaced multimode vibration frequencies and this dynamic characteristic results in a non-trivial vibration problem. Structural stiffening and/or insertion of struts between floors are the usual tentative solution applied to existing vibrating floor structures. Such structural alterations are in general expensive and unsuitable. In this paper, this vibration problem is analyzed on the basis of results obtained from experimental measurements in typical composite floors and their theoretical counterpart obtained with computational modeling simulations. A passive control system composed by multiple synchronized dynamic attenuators (MSDA) was designed and installed in these floor structures and its efficiency was evaluated both experimentally and through numerical simulations. The results obtained from experimental tests of the continuous slab panels under human walking dynamic action proved the effectiveness of this control system in reducing vibrations amplitudes.

Double controller of wind induced bending oscillations in telecom towers

Ronaldo C. Battista,Michèle S. Pfeil,Eliane M.L. Carvalho,Wendell D. Varela 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.1

Wind induced large bending oscillation amplitudes in tall and slender telecommunication steel towers may lead to precocious fatigue cracks and consequent risk of collapse of these structures, many of them installed in rural areas alongside highways and in highly populated urban areas. Varying stress amplitudes at hot spots may be attenuated by means of passive control mechanical devices installed in the tower. This paper gives an account of both mathematical-numerical model and the technique applied to design and evaluate the performance of a double controller installed in existing towers which is composed by a nonlinear pendulum and a novel type of passive controller described herein as a planar motion disk mounted on shear springs. Results of experimental measurements carried out on two slender tubular steel towers under wind action demonstrate the efficiency of the double controllers in attenuating the towers bending oscillation amplitudes and consequent stress amplitudes extending the towers fatigue life.

Mixed Adenoneuroendocrine Gastric Carcinoma: A Case Report and Review of the Literature

Levi Sandri, Giovanni Battista,Carboni, Fabio,Valle, Mario,Visca, Paolo,Garofalo, Alfredo The Korean Gastric Cancer Association 2014 Journal of gastric cancer Vol.14 No.1

We present a rare case of a gastric mixed adenoneuroendocrine tumor and review the related English literature. A 77-year-old Caucasian woman was admitted to our department with nausea, anorexia, weight loss, and anemia. Esophagogastroduodenoscopy showed a large (>7 cm) ulcerative mass in the greater curvature of the stomach. Biopsy showed the presence of an adenocarcinoma with moderate differentiation. The patient underwent D2 subtotal gastrectomy. Histopathological analysis revealed a diagnosis of mixed gastric adenoneuroendocrine carcinoma. The post-operative course was uneventful, and at the 6-month follow-up, the patient was alive without evidence of recurrence. Our review of the English literature suggested that such cases are most often reported from eastern countries. Multimodal treatment should be the aim for these patients because of the neuroendocrine component of the tumor.

Distal pancreatectomy with splenorenal shunt to preserve spleen in a cirrhotic patient

Giuseppe Maria Ettorre,Giovanni Battista Levi Sandri,Marco Colasanti,Edoardo de Werra,Pasquale Lepiane 한국간담췌외과학회 2017 Annals of hepato-biliary-pancreatic surgery Vol.21 No.2

Risk indicators related to periimplant disease: an observational retrospective cohort study

Poli, Pier Paolo,Beretta, Mario,Grossi, Giovanni Battista,Maiorana, Carlo Korean Academy of Periodontology 2016 Journal of Periodontal & Implant Science Vol.46 No.4

Purpose: The aim of the present study was to retrospectively investigate the influence of potential risk indicators on the development of peri-implant disease. Methods: Overall, 103 patients referred for implant treatment from 2000 to 2012 were randomly enrolled. The study sample consisted of 421 conventional-length (>6 mm) non-turned titanium implants that were evaluated clinically and radiographically according to preestablished clinical and patient-related parameters by a single investigator. A non-parametric Mann-Whitney U test or Kruskal-Wallis rank test and a logistic regression model were used for the statistical analysis of the recorded data at the implant level. Results: The diagnosis of peri-implant mucositis and peri-implantitis was made for 173 (41.1%) and 19 (4.5%) implants, respectively. Age (${\geq}65$ years), patient adherence (professional hygiene recalls <2/year) and the presence of plaque were associated with higher peri-implant probing-depth values and bleeding-on-probing scores. The logistic regression analysis indicated that age (P=0.001), patient adherence (P=0.03), the absence of keratinized tissue (P=0.03), implants placed in pristine bone (P=0.04), and the presence of peri-implant soft-tissue recession (P=0.000) were strongly associated with the event of peri-implantitis. Conclusions: Within the limitations of this study, patients aged ${\geq}65$ years and non-adherent subjects were more prone to develop peri-implant disease. Therefore, early diagnosis and a systematic maintenance-care program are essential for maintaining peri-implant tissue health, especially in older patients.

Monitoring and vibration control of a fluid catalytic cracking unit

Wendell D. Varela,Ronaldo C. Battista,Igor Braz N. Gonzaga 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.4

Oil refineries' Fluid Catalytic Cracking Units (FCCU) when in full operation may exhibit strong fluid dynamics caused by turbulent flow in the piping system that may induce vibrations in other mechanical and structural components of the Unity. This paper reports on the experimental-theoretical-computational program performed to get the vibration properties and the dynamic response amplitudes to find out alternative solutions to attenuate the excessive vibrations that were causing fatigue fractures in components of the bottle like reactor-regenerator of an FCC unit in operation in an existing oil refinery in Brazil. Solutions to the vibration problem were sought with the aid of a 3D finite element model calibrated with the results obtained from experimental measurements. A short description of the found solutions is given and their effectiveness are shown by means of numerical results. The solutions were guided by the concepts of structural stiffening and dynamic control performed by a nonlinear pendulum controller whose mechanical design was based on parameters determined by means of a parametric study carried out with 2D and 3D mathematical models of the coupled pendulum-structure system. The effectiveness of the proposed solutions is evaluated in terms of the fatigue life of critical welded connections.