BEM‐simulation of tubes using thin elements

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Wolfgang Kreuzer ◽  
Veronika Weber
Keyword(s):  
2021 ◽  
pp. 135406612110442
Author(s):  
Tobias Heinrich ◽  
Yoshiharu Kobayashi ◽  
Edward Lawson

Pundits, development practitioners, and scholars worry that rising populism and international disengagement in developed countries have negative consequences on foreign aid. However, how populism and foreign aid go together is not well understood. This paper provides the first systematic examination of this relationship. We adopt the popular ideational definition of populism, unpack populism into its core “thin” elements, and examine them within a delegation model of aid policy—a prominent framework in the aid literature. In so doing, we identify specific domestic political processes through which the core components of populism may affect aid spending. We argue that increases in one component of populism—anti-elitism—and in nativist sentiments, an associated concept, in a donor country lead to a reduction in aid spending through a public opinion channel. We supply both micro- and macro-evidence for our arguments by fielding surveys in the United States and United Kingdom as well as by analyzing aid spending by a large number of OECD donors. Our findings show that nativism and anti-elitism, rather than populism per se, influence not only individual attitudes toward aid but also actual aid policy and generate important insights into how to address populist challenges to foreign aid. Beyond these, our study contributes to the broader International Relations literature by demonstrating one useful analytical approach to studying populism, nativism, and foreign policy.


2016 ◽  
Vol 19 (2) ◽  
pp. 52
Author(s):  
Milan Maksimović

High-contrast gratings (HCG) are ultra-thin elements operating in sub-wavelength regime with the period of the grating smaller than the wavelength and with the high-index grating material fully surrounded by low-index material. Design of MEMS mirrors made from HCG with specific reflectivity response is of great practical interest in integrated optoelectronics. We theoretically investigate design of the spectral response for HCGs with the complex unit cells. We show that the spectral response can be tailored via the unit cell perturbations and with the asymmetric unit cell perturbations may introduce completely new spectral response. Our results can serve as guidance for the design of the complex HCGs and help with the choice of the efficient initial grating topology prior to global optimization procedure.


2018 ◽  
Vol 29 (16) ◽  
pp. 3266-3283 ◽  
Author(s):  
Astrid S Pechstein ◽  
Martin Meindlhumer ◽  
Alexander Humer

We propose a new three-dimensional formulation based on the mixed tangential-displacement normal-normal-stress method for elasticity. In elastic tangential-displacement normal-normal-stress elements, the tangential component of the displacement field and the normal component of the stress vector are degrees of freedom and continuous across inter-element interfaces. Tangential-displacement normal-normal-stress finite elements have been shown to be locking-free with respect to shear locking in thin elements, which makes them suitable for the discretization of laminates or macro-fiber composites. In the current paper, we extend the formulation to piezoelectric materials by adding the electric potential as degree of freedom.


1974 ◽  
Vol 10 (7) ◽  
pp. 625-626
Author(s):  
L. M. Voronenko ◽  
B. M. Petrov ◽  
Yu. Z. Zvonkin ◽  
V. P. Terenin ◽  
A. P. Aksenov
Keyword(s):  

2009 ◽  
Vol 33 (4) ◽  
pp. 297-301 ◽  
Author(s):  
Karnyupha Jittivadhna ◽  
Pintip Ruenwongsa ◽  
Bhinyo Panijpan

From our teaching of the contractile unit of the striated muscle, we have found limitations in using textbook illustrations of sarcomere structure and its related dynamic molecular physiological details. A hand-held model of a striated muscle sarcomere made from common items has thus been made by us to enhance students' understanding of the sliding filament mechanism as well as their appreciation of the spatial arrangements of the thick and thin filaments. The model proves to be quite efficacious in dispelling some alternative conceptions held by students exposed previously only to two-dimensional textbook illustrations and computer graphic displays. More importantly, after being taught by this hand-held device, electronmicrographic features of the A and I bands, H zone, and Z disk can be easily correlated by the students to the positions of the thick and thin elements relatively sliding past one another. The transverse expansion of the sarcomere and the constancy of its volume upon contraction are also demonstrable by the model.


2018 ◽  
Vol 199 ◽  
pp. 11015
Author(s):  
Amir Asgharzadeh ◽  
Michael Raupach

Carbon textiles are used more and more as reinforcement in concrete structures. Due to their high durability the concrete covers can be extremely thin compared to traditional steel reinforced concrete, resulting in the possibility to build very thin elements with excellent performance. To improve the properties of the carbon textiles, the rovings are normally impregnated with different types of polymers. Additionally to the use as reinforcement, carbon textiles can also be used as anodes for cathodic protection. However, while first tests have shown, that impregnated carbon rovings are suitable to be used as CP-anodes, it is still not clear under which conditions the new types of anodes are stable or when they start to dissolve. This paper describes investigations on the influence of an anodic polarisation on the tensile strength of different types of impregnated carbon rovings.


10.12737/5898 ◽  
2014 ◽  
Vol 21 (3) ◽  
pp. 54-58
Author(s):  
Соколик ◽  
E. Sokolik ◽  
Егоров ◽  
A. Egorov

The studies have shown that drinking alcohol by woman during pregnancy can lead not only to a full fetal alcohol syndrome, but also causes less severe dysmorphic, cognitive and behavioral disordersl, i.e. fetal alcohol spectrum disorders, leads to low birth weight, fetal death, and other complications of pregnancy. The purpose of this study was to investigate the influence of neuroprotective drugs tiocetam, cerebrocurin and piracetam on the marks of thin elements of energy metabolism and compensatory shunts in the brain of animals early age undergoing prenatal alcoholism. In pregnant rats with alcoholism were found neuroprotective and nootropic effects of cerebrocurin and tiocetam after parenterally administered to newborn animals for a period of 25 days. The above drugs have a beneficial effect on the main elements of the energy metabolism on the neonatal brain. On the severity of mitoprotective and energotropic mechanisms of neuroprotective action, aimed at reducing the negative impact of alcohol on the progeny, tiocetam and cerebrocurin far exceed basic nootropic drug piracetam.


2009 ◽  
Author(s):  
Alfredo U. Luccio ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
Simonetta Liuti ◽  
...  
Keyword(s):  

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