scholarly journals Mechanical model of giant photoexpansion in a chalcogenide glass and the role of photofluidity

2017 ◽  
Vol 516 ◽  
pp. 85-91 ◽  
Author(s):  
Manuel Buisson ◽  
Yann Gueguen ◽  
Romain Laniel ◽  
Christopher Cantoni ◽  
Patrick Houizot ◽  
...  
Keyword(s):  
Chalcogenide Glass ◽  
Mechanical Model

scholarly journals On the influence of delamination on laminated paperboard creasing and folding

2012 ◽  
Vol 370 (1965) ◽  
pp. 1912-1924 ◽  
Author(s):  
Lars A. A. Beex ◽  
Ron H. J. Peerlings
Keyword(s):  
Cohesive Zone ◽  
Mechanical Model ◽  
Cohesive Zone Model ◽  
Packaging Material ◽  
Friction Model ◽  
Zone Model ◽  
General Mechanics ◽  
Single Fold ◽  
Wide Range

Laminated paperboard is used as a packaging material for a wide range of products. During production of the packaging, the fold lines are first defined in a so-called creasing (or scoring) operation in order to obtain uncracked folds. During creasing as well as folding, cracking of the board is to be avoided. A mechanical model for a single fold line has been proposed in a previous study (Beex & Peerlings 2009 Int. J. Solids Struct. 46 , 4192–4207) to investigate the general mechanics of creasing and folding, as well as which precise mechanisms trigger the breaking of the top layer. In the present study, we employ this modelling to study the influence of delamination on creasing and folding. The results reveal the separate role of the cohesive zone model and the friction model in the description of delamination. They also show how the amount of delamination behaviour should be controlled to obtain the desired high folding stiffness without breaking of the top layer.

Role of iodine in broadening the optical window of As Sb S I chalcogenide glass system

2017 ◽  
Vol 470 ◽  
pp. 47-52 ◽  
Author(s):  
Akila G. Prabhudessai ◽  
Kaushik Biswas ◽  
S. Balaji ◽  
Rana Dasgupta ◽  
Pratik Sarkar ◽  
...  
Keyword(s):  
Chalcogenide Glass ◽  
Glass System ◽  
Optical Window

scholarly journals Proposal for a mechanical model of mobile shales

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Juan I. Soto ◽  
Mahdi Heidari ◽  
Michael R. Hudec
Keyword(s):  
Critical State ◽  
Mechanical Model ◽  
Sedimentary Rock ◽  
Structural Systems ◽  
Continental Margins ◽  
Subsurface Structure ◽  
Mud Volcanoes ◽  
The Poor ◽  
Poor Understanding

AbstractStructural systems involving mobile shale represent one of the most difficult challenges for geoscientists dedicated to exploring the subsurface structure of continental margins. Mobile-shale structures range from surficial mud volcanoes to deeply buried shale diapirs and shale-cored folds. Where mobile shales occur, seismic imaging is typically poor, drilling is hazardous, and established principles to guide interpretation are few. The central problem leading to these issues is the poor understanding of the mechanical behaviour of mobile shales. Here we propose that mobile shales are at critical state, thus we define mobile shales as “bodies of clay-rich sediment or sedimentary rock undergoing penetrative, (visco-) plastic deformation at the critical state”. We discuss how this proposition can explain key observations associated with mobile shales. The critical-state model can explain the occurrence of both fluidized (no grain contact) shales (e.g., in mud volcanoes) and more viscous shales flowing with grain-to-grain contact (e.g., in shale diapirs), mobilization of cemented and compacted shales, and the role of overpressure in shale mobility. Our model offers new avenues for understanding complex and fascinating mobile-shale structures.

ENHANCING EMISSION PROPERTIES OF RARE EARTH IONS IN CHALCOGENIDE GLASS VIA MINUTE COMPOSITIONAL ADJUSTMENTS

2010 ◽  
Vol 19 (04) ◽  
pp. 663-671 ◽  
Author(s):  
YONG GYU CHOI
Keyword(s):  
Rare Earth ◽  
Chalcogenide Glass ◽  
Alkali Halides ◽  
Rare Earth Ions ◽  
Emission Properties ◽  
Group Iii ◽  
Thermal Stability Of ◽  
Nonradiative Processes ◽  
Sulphide Glass

The significant role of the chemical environments of rare earths ions in controlling their radiative and nonradiative processes are exemplified in this study: The emission properties of rare earth ions ( Dy3+ or Tm3+ ) embedded in the strong covalent chalcogenide glass ( Ge and/or As containing sulphide glass) are dramatically enhanced upon the addition of very small amount of the Group III elements ( Ga or In ) and alkali halides ( CsBr or RbBr ). These compositional adjustments alter only the local structural environments of rare earth ions, while thermal stability of the modified glass is kept unaltered.

Towards a Mechanical Model of Skin: Insights into Stratum Corneum Mechanical Properties from Hierarchical Models of Lipid Organisation

2004 ◽  
Vol 844 ◽  
Author(s):  
Brendan O'Malley ◽  
David J. Moore ◽  
Massimo Noro ◽  
Jamshed Anwar ◽  
Becky Notman ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stratum Corneum ◽  
Mechanical Model ◽  
The Body ◽  
Coarse Grained ◽  
Lipid Matrix ◽  
Lipid Species ◽  
Atomistic Models ◽  
Mesoscale Simulations

ABSTRACTThe stratum corneum (SC), the outermost layer of the skin, provides the body with a physiologically essential barrier to unregulated water loss and the influx of exogenous substances. Furthermore, the 10–20 micron thick SC, composed of overlapping protein-rich corneocytes surrounded by a heterogeneous multilamellar lipid matrix, displays tremendous mechanical cohesion and thermal integrity. To understand the contribution of these components to SC mechanical properties requires building a complete mechanical model of the skin. In this study we focus on modelling the hierarchical microstructure of the lipid phase and its relation to mechanical properties using a combination of atomistic and mesoscale simulations. The modelling approaches are parameterised with experimental data from FT-IR spectroscopy, X-ray scattering and, in the case of the mesoscale simulations, with detailed density profiles derived from atomic models. The atomistic models are used to probe the role of specific lipid species in maintaining the thermal and structural stability of the SC extracellular lipid matrix and to investigate the role of hydrogen bonding networks in SC lipid cohesion. Mesoscale models are used to investigate domain formation and lipid bilayer organisation on length and time scales inaccessible with atomistic models. These coarse grained models display transitions between ordered hexagonal gel phases and fluid phases, reproducing the experimentally observed ordering of the hydrophilic and hydrophobic regions.

Study on the Screening Effectiveness of Vibration Isolation Trench

2011 ◽  
Vol 71-78 ◽  
pp. 4444-4448 ◽  
Author(s):  
X. M. Zhang ◽  
J. Li ◽  
J. S. Yang
Keyword(s):  
Surface Waves ◽  
Mechanical Model ◽  
Vibration Isolation ◽  
Coupling Effect ◽  
Rapid Development ◽  
Noise Pollution ◽  
Vibration Energy ◽  
Residual Vibration ◽  
Screening Effectiveness

With the rapid development of industry and transportation, the awareness of environmental problems such as noise pollution and vibration pollution and so on, has led to an increasing interest in methods for noise and vibration isolation. The dynamic mechanical model for forging hammer foundation is analyzed firstly. Through the choice of the scheme of vibration isolation, one vibration isolation trench coupling the piles in rows was design. Grouting piles used as exterior protected structure for vibration isolation trench, which have a role of rigid vibration isolation. Soft material in-filled in the trench, which has a function of flexible isolation, can absorb the residual vibration energy penetrating through the piles in rows. It indicated by the site measurements that the surface waves should be hold back and diffracted effectively by the coupling effect of flexible isolation of the in-filled material and the rigid isolation of piles in rows.

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