Publications by authors named "Youssef Fahmy"
Article Synopsis
- Thermoplastic polyurethanes (TPUs) are ideal for 3D printing via fused deposition modeling (FDM) when flexibility and strength are needed, but predicting how they deform can be challenging due to varying printing parameters.
- This study investigates the development of accurate hyperelastic constitutive models for TPU parts created with different infill geometries and nozzle temperatures, using six groups of uniaxial tensile specimens.
- The researchers found that a third-order Mooney-Rivlin model effectively represents the behavior of these TPU parts, and their approach was validated through experimental results and finite element analysis (FEA), showing minimal errors.
Development of an Anisotropic Hyperelastic Material Model for Porcine Colorectal Tissues.
Bioengineering (Basel)
January 2024
Many colonic surgeries include colorectal anastomoses whose leaks may be life-threatening, affecting thousands of patients annually. Various studies propose that mechanical interaction between the staples and neighboring tissues may play an important role in anastomotic leakage. Therefore, understanding the mechanical behavior of colorectal tissue is essential to characterizing the reasons for this type of failure.
View Article and Find Full Text PDFThe advancement of 3D printing has led to its widespread use. NinjaFlex, a thermoplastic polyurethane (TPU) filament, is a highly durable and flexible material that has been used to create flexible parts. While this material has been available for nearly two decades, the mechanical properties of 3D printed NinjaFlex parts are not well-understood, especially in bending.
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- Global surgery is becoming an important area of study in global health, but it suffers from authorship inequities, particularly over-representation of authors from high-income countries (HICs) and under-representation of those from low- and middle-income countries (LMICs).
- A systematic analysis of global surgery publications from 2016 to 2020 revealed that the majority of authors were male (60%), primarily from HICs (51%), and held senior positions (55% were fully qualified clinicians or in leadership roles).
- The study highlights significant gender and seniority disparities, especially with LMIC authors having fewer female authors and that more efforts are needed to improve authorship opportunities for underrepresented groups in global surgery research.
Sub-nanoliter volumes of the Belousov-Zhabotinsky (BZ) reaction are sealed in microfluidic devices made from polydimethylsiloxane (PDMS). Bromine, which is a BZ reaction intermediate that participates in the inhibitory pathway of the reaction, is known to permeate into PDMS, and it has been suggested that PDMS and bromine can react ( . 108, 2004, 1325-1332).
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