A Carbodiimide Coupling Approach for PEGylating GelMA and Further Tuning GelMA Composite Properties

2020 ◽  
pp. 2000604
Author(s):  
Patricia Comeau ◽  
Thomas Willett
Keyword(s):  
Coupling Approach ◽  
Composite Properties ◽  
Carbodiimide Coupling

Glass transition for dipolar hard spheres: a mode-coupling approach

1998 ◽  
Vol 77 (2) ◽  
pp. 305-311 ◽  
Author(s):  
Thomas Scheidsteger, Rolf Schilling
Keyword(s):  
Glass Transition ◽  
Mode Coupling ◽  
Hard Spheres ◽  
Coupling Approach

Convergent Total Synthesis of Principinol D, a Rearranged Kaurane Diterpenoid

2019 ◽  
Author(s):  
Timothy Newhouse ◽  
Aneta Turlik ◽  
Yifeng Chen ◽  
Anthony Scruse
Keyword(s):  
Total Synthesis ◽  
Natural Product ◽  
Late Stage ◽  
Membered Ring ◽  
Entry Point ◽  
Ketone Reduction ◽  
Coupling Approach

<div> <p>The total synthesis of principinol D, a rearranged kaurane diterpenoid, is reported. This grayanane natural product is constructed via a convergent fragment coupling approach, wherein the central 7-membered ring is synthesized at a late stage. The bicyclo[3.2.1]octane fragment is accessed by a Ni-catalyzed α-vinylation reaction. Strategic reductions include a diastereoselective SmI<sub>2</sub>-mediated ketone reduction with PhSH and a new protocol for selective ester reduction in the presence of ketones. The convergent strategy reported herein may be an entry point to the larger class of kaurane diterpenoids.</p> </div>

Design of Pipeline Composite Repairs: From Lab Scale Tests to FEA and Full Scale Testing

2014 ◽  
Author(s):  
Remy Her ◽  
Jacques Renard ◽  
Vincent Gaffard ◽  
Yves Favry ◽  
Paul Wiet
Keyword(s):  
Finite Element ◽  
Full Scale ◽  
Combined Loading ◽  
Material Strength ◽  
Repair System ◽  
Loading Conditions ◽  
Original Design ◽  
Composite Repair ◽  
Repair Systems ◽  
Composite Properties

Composite repair systems are used for many years to restore locally the pipe strength where it has been affected by damage such as wall thickness reduction due to corrosion, dent, lamination or cracks. Composite repair systems are commonly qualified, designed and installed according to ASME PCC2 code or ISO 24817 standard requirements. In both of these codes, the Maximum Allowable Working Pressure (MAWP) of the damaged section must be determined to design the composite repair. To do so, codes such as ASME B31G for example for corrosion, are used. The composite repair systems is designed to “bridge the gap” between the MAWP of the damaged pipe and the original design pressure. The main weakness of available approaches is their applicability to combined loading conditions and various types of defects. The objective of this work is to set-up a “universal” methodology to design the composite repair by finite element calculations with directly taking into consideration the loading conditions and the influence of the defect on pipe strength (whatever its geometry and type). First a program of mechanical tests is defined to allow determining all the composite properties necessary to run the finite elements calculations. It consists in compression and tensile tests in various directions to account for the composite anisotropy and of Arcan tests to determine steel to composite interface behaviors in tension and shear. In parallel, a full scale burst test is performed on a repaired pipe section where a local wall thinning is previously machined. For this test, the composite repair was designed according to ISO 24817. Then, a finite element model integrating damaged pipe and composite repair system is built. It allowed simulating the test, comparing the results with experiments and validating damage models implemented to capture the various possible types of failures. In addition, sensitivity analysis considering composite properties variations evidenced by experiments are run. The composite behavior considered in this study is not time dependent. No degradation of the composite material strength due to ageing is taking into account. The roadmap for the next steps of this work is to clearly identify the ageing mechanisms, to perform tests in relevant conditions and to introduce ageing effects in the design process (and in particular in the composite constitutive laws).

scholarly journals Effect of calcination temperature on silica-asphalt composite properties using amorphous rice husk silica

2021 ◽  
Vol 1751 ◽  
pp. 012071
Author(s):  
S. Sembiring ◽  
A. Riyanto ◽  
I. Firdaus ◽  
Junaidi ◽  
R. Situmeang
Keyword(s):  
Calcination Temperature ◽  
Rice Husk ◽  
Rice Husk Silica ◽  
Composite Properties

1D and 2D model coupling approach for the development of operational spatial flood early warning system

2021 ◽  
pp. 1-16
Author(s):  
Sindhu Kalimisetty ◽  
Amanpreet Singh ◽  
Durga Rao Korada Hari Venkata ◽  
Venkateshwar Rao V ◽  
Vazeer Mahammood
Keyword(s):  
Early Warning ◽  
Early Warning System ◽  
Warning System ◽  
Model Coupling ◽  
Coupling Approach ◽  
2D Model

scholarly journals Repurposed/recycled discontinuous carbon fiber organosheet development and composite properties

2021 ◽  
Vol 4 ◽  
pp. 100092
Author(s):  
Philip R. Barnett ◽  
Colby L. Gilbert ◽  
Dayakar Penumadu
Keyword(s):  
Carbon Fiber ◽  
Composite Properties

scholarly journals A catalytic asymmetric cross-coupling approach to the synthesis of cyclobutanes

2021 ◽  
Author(s):  
F. Wieland Goetzke ◽  
Alexander M. L. Hell ◽  
Lucy van Dijk ◽  
Stephen P. Fletcher
Keyword(s):  
Cross Coupling ◽  
Coupling Approach ◽  
Catalytic Asymmetric
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