Harnessing electromechanical membrane wrinkling for actuation

2012 ◽  
Vol 101 (17) ◽  
pp. 171906 ◽  
Author(s):  
Andrew T. Conn ◽  
Jonathan Rossiter
Keyword(s):  
Membrane Wrinkling

Efficient sub-grid scale modeling of membrane wrinkling by a projection method

2009 ◽  
Vol 198 (9-12) ◽  
pp. 1097-1116 ◽  
Author(s):  
A. Jarasjarungkiat ◽  
R. Wüchner ◽  
K.-U. Bletzinger
Keyword(s):  
Projection Method ◽  
Scale Modeling ◽  
Membrane Wrinkling

Membrane wrinkling control usingin situstiffness changes induced by phase transformation

2010 ◽  
Vol 19 (9) ◽  
pp. 094005 ◽  
Author(s):  
Myunghoon Seong ◽  
Dong-Gun Lee ◽  
K P Mohanchandra ◽  
Gregory P Carman
Keyword(s):  
Phase Transformation ◽  
Membrane Wrinkling

Anisotropic membrane wrinkling: theory and analysis

2001 ◽  
Vol 38 (30-31) ◽  
pp. 5253-5272 ◽  
Author(s):  
Marcelo Epstein ◽  
Mario A. Forcinito
Keyword(s):  
Membrane Wrinkling

Fluid-Structure Interaction Simulations of Parachute Deployment and Inflation

2021 ◽  
Author(s):  
Liwu Wang ◽  
Mingzhang Tang ◽  
Yu Liu ◽  
Sijun Zhang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Structure Interaction ◽  
Computational Approach ◽  
Computational Techniques ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Structure Dynamics ◽  
Computational Structure ◽  
Membrane Wrinkling

Abstract The numerical simulation of the parachute deployment/inflation process involves fluid structure interaction problems, the inherent complexities in the fluid structure interaction have been posing several computational challenges. In this paper a high fidelity Eulerian computational approach is proposed for the simulation of parachute deployment/inflation. Unlike the arbitrary Eulerian Lagrangian (ALE) method widely employed in this area, the Eulerian computational approach is established on three computational techniques: computational fluid dynamics, computational structure dynamics and computational moving boundary. A set of stationary, non-deforming Cartesian grids is adopted in our computational fluid dynamics, our computational structure dynamics is enhanced by non-linear finite element method and membrane wrinkling algorithm, instead of conventional computational mesh dynamics, an immersed boundary method is employed to avoid insurmountable poor grid quality brought in by moving mesh approaches. To validate the proposed numerical approach the deployment/inflation of C-9 parachute is simulated using our approach and the results show similar characteristics compared with experimental results and previous literature. The computed results have demonstrated the proposed method to be a useful tool for analyzing dynamic parachute deployment and subsequent inflation.

scholarly journals Multinucleation of Skeletal Muscle in vitro

1960 ◽  
Vol 7 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Charles R. Capers
Keyword(s):  
Muscle Development ◽  
Horse Serum ◽  
Muscle Fibers ◽  
Time Lapse ◽  
Nuclear Migration ◽  
Myoblast Fusion ◽  
Mitochondrial Activity ◽  
Sequence Of Events ◽  
Membrane Wrinkling

Healthy, mature, spontaneously contracting muscle was cultivated from explants of 13-day chick embryos for periods up to 4 months in the multipurpose chamber (Rose, 1954) using cellophane-strip technique (Rose et al., 1958) with silicone gaskets, Eagle's medium including 10 per cent horse serum reinforced with 300 mg-per cent of glucose, and the teased type of explant. This method provided optically ideal conditions for the study of muscle fibers with oil immersion, phase contrast time-lapse cinematography at 1 frame per minute without apparent damage for periods as long as 10 days. In no case was mitosis, amitosis, or nuclear "budding" observed in the course of muscle development. Multinuclear muscle fibers have been shown with cine technique to result from both myoblast fusion and polar extension of preformed (explanted) muscle tissue. Myoblast fusion was the only demonstrable way of giving rise to multinucleation. Nuclear membrane "wrinkling" was shown to be merely a temporary distortion that occurred during nuclear migration and rotation. It is suggested that this phenomenon may be responsible for numerous reports of amitosis in the genesis of muscle fibers. The histological development of new straps resulted from an orderly sequence of events. Included in these were polar extension, nuclear migration, rotation, and fixation. Following these events there was increased mitochondrial activity, myofibril formation, and cross-banding. Spontaneous contractions were seen throughout the entire course of differentiation in vitro but became more regular and stronger in the later stages.

Fuzzy Control of Membrane Wrinkling

1999 ◽  
Vol 5 (2) ◽  
pp. 139-148 ◽  
Author(s):  
V. D. Kalanovic ◽  
C. H. Jenkins ◽  
F. Haugen
Keyword(s):  
Fuzzy Control ◽  
Membrane Wrinkling

Uncertainty of membrane wrinkling behaviors considering initial thickness imperfections

2020 ◽  
Vol 191-192 ◽  
pp. 264-277 ◽  
Author(s):  
Yangjun Luo ◽  
Jian Xing ◽  
Zhan Kang ◽  
Junjie Zhan ◽  
Ming Li
Keyword(s):  
Initial Thickness ◽  
Membrane Wrinkling

scholarly journals Ocular findings in patients with transfusion-dependent β-thalassemia in southern Iran

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Sezaneh Haghpanah ◽  
Omid Reza Zekavat ◽  
Mohammadreza Bordbar ◽  
Mehran Karimi ◽  
Soheila Zareifar ◽  
...  
Keyword(s):  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Diabetic Patients ◽  
Ocular Involvement ◽  
Close Monitoring ◽  
Similar Frequency ◽  
Southern Iran ◽  
Ocular Findings ◽  
Membrane Wrinkling ◽  
The Mean

Abstract Background Ocular involvement may occur via several mechanisms in patients with transfusion-dependent β-thalassemia (TDT) mainly chronic anemia, iron overload and iron chelator toxicity. We aimed to evaluate the frequency of abnormal ocular findings and their relationship with hematologic parameters in TDT patients. Methods In this cross-sectional study from January 2018 to January 2019, a total of 79 patients with TDT over the age of 18 who were on iron-chelation therapy (ICT) were consecutively investigated. All patients were registered at the Thalassemia Comprehensive Center affiliated with Shiraz University of Medical Sciences, Shiraz, Southern Iran. Complete ophthalmic examination was performed by an expert ophthalmologist. Clinical and hematologic parameters were collected from the patients´ medical records. Results The mean age ± standard deviation (SD) of the patients was 28.4 ± 5.6 years (range: 18–43). Twenty-four patients (30.4%) were male and 29 (36.7%) were splenectomized. The mean ± SD of the best-corrected visual acuity (VA) was 0.960 ± 0.086 decimal, (range: 0.6–1), 0.016 ± 0.046 logMar, (range: 0–0.2). The frequency of patients with VA > 0.1 logMar was 3 (3.8%). The mean intraocular pressure (IOP) was 14.88 ± 3.34 (6–25) mmHg. Fundus abnormalities were observed in 8 patients (10.1%), consisting of increased cup-disk ratio (3.8%), vessel tortuosity (2.5%), retinal pigment epithelium degeneration (2.5%), myelinated nerve fiber layer (1.3%), and internal limiting membrane wrinkling (1.3%). No significant association was observed between fundus abnormalities, VA, or IOP with hematologic parameters (P > 0.05). TDT patients with diabetes mellitus had significantly higher IOP (P = 0.010) but similar frequency of fundus abnormalities with non-diabetic patients (P > 0.05). Conclusions The frequency of ocular abnormalities in our patients was lower than the previous reports. The frequency of fundus abnormalities were similar in diabetic and non-diabetic thalassemia patients indicating close monitoring and proper management of the disease and comorbidities in these patients.

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