Critical Design Considerations for Static and Dynamic Performances on 6.5 kV 4H-SiC MOSFETs Fabricated in a 6-inch SiC Foundry

2021 ◽  
Author(s):  
Nick Yun ◽  
Justin Lynch ◽  
Skylar DeBoer ◽  
Adam J Morgan ◽  
Woongje Sung ◽  
...  
Keyword(s):  
Critical Design ◽  
Design Considerations ◽  
Dynamic Performances

Fundamental Design Issues for Supplemental Damping Applications

1993 ◽  
Vol 9 (3) ◽  
pp. 627-636 ◽  
Author(s):  
Roger Scholl
Keyword(s):  
Cost Benefit ◽  
Earthquake Response ◽  
Critical Design ◽  
Design Considerations ◽  
Significant Damage ◽  
Frame Buildings ◽  
Structural Engineer ◽  
Supplemental Damping ◽  
Frame Member ◽  
Mode Response

In considering supplemental damping for a project, immediate questions that the structural engineer must address are: 1) Is the building suitable for supplemental damping; 2) How much damping should be provided; and 3) How should the dampers be distributed in the building? These are issues that need to be resolved irrespective of the type of damper used. The evaluation in this paper shows that supplemental damping is ideally suited for flexible frame buildings, or buildings detailed to accommodate interstory drift ratios of about 0.01 without significant damage. Providing 10% to 20% supplemental damping reduces response significantly for most structures. Providing more damping is difficult to justify from a cost-benefit perspective. Providing less supplemental damping can reduce earthquake response for structures having only small amounts of inherent damping; e.g., 1% to 2%. For most buildings having predominant fundamental mode response, the distribution of dampers in a structure is determined mostly from designing to carry the damper lateral forces. Frame member stresses, plan stiffness regularity, and elevation stiffness regularity are critical design considerations for establishing damper distributions in buildings.

scholarly journals Magnetoelastic Materials for Monitoring and Controlling Cells and Tissues

2021 ◽  
Vol 13 (24) ◽  
pp. 13655
Author(s):  
Kaylee Marie Meyers ◽  
Keat Ghee Ong
Keyword(s):  
Wireless Sensors ◽  
Manufacturing Processes ◽  
Sensors And Actuators ◽  
Control Techniques ◽  
Critical Design ◽  
Design Considerations ◽  
Recent Developments ◽  
Magnetoelastic Materials ◽  
Quality Control Techniques

Advances in cell and tissue therapies are slow to be implemented in the clinic due to the limited standardization of safety and quality control techniques. Current approaches for monitoring cell and tissue manufacturing processes are time and labor intensive, costly, and lack commercial scalability. One method to improving in vitro manufacturing processes includes utilizing the coupled magnetic and mechanical properties of magnetoelastic (ME) materials as passive and wireless sensors and actuators. Specifically, ME materials can be used in quantifying cell adhesion, detecting contamination, measuring biomarkers, providing biomechanical stimulus, and enabling cell detachment in bioreactors. This review outlines critical design considerations for ME systems and summarizes recent developments in utilizing ME materials for sensing and actuation in cell and tissue engineering.

scholarly journals Composite Shaftless Roller Design for Conveyor System

2021 ◽  
Author(s):  
Greg Wheatley ◽  
Mohammad Zaeimi
Keyword(s):  
Weight Ratio ◽  
Light Weight ◽  
Huge Number ◽  
Conveyor System ◽  
Critical Design ◽  
Design Considerations ◽  
Final Design ◽  
And Performance ◽  
Belt Conveyors ◽  
Standard Steel

Improving the performance of idlers is paramount to the performance of the conveyor system in various industries since belt conveyors can be many kilometers in length and consequently there are a huge number of rollers in use. The key intention of this work is the development of a light-weight composite idler roller. Critical design considerations are strength-to-weight ratio and performance. Most importantly, the design must reduce the weight of the roller as compared to standard steel rollers. The final design provides a significant reduction in weight of about 47 % over that of traditional steel rollers of a similar size.

Design of a Two DOF Laminate Leg Transmission for Creating Walking Robot Platforms

2019 ◽  
Author(s):  
Benjamin D. Shuch ◽  
Taha Shafa ◽  
Eric Rogers ◽  
Daniel M. Aukes
Keyword(s):  
Range Of Motion ◽  
Low Cost ◽  
Legged Locomotion ◽  
Degree Of Freedom ◽  
Walking Robot ◽  
Control Space ◽  
Critical Design ◽  
Design Considerations ◽  
Laminate Design ◽  
Two Degree Of Freedom

Abstract In this article we present a low-cost, two degree-of-freedom laminate robot transmission for legged locomotion applications. This transmission is specifically applied in the design of a quadrupedal robot, and has the potential to be used in other multi-legged systems. It offers a complex control space with a variety of different programmable gait trajectories, while leveraging low-cost linkages made using laminate approaches. The two-degree-of-freedom kinematics of the leg are subsequently modeled in Python, and the workspace of the robot is then experimentally verified on an initial quadrupedal design. Critical design considerations include the laminate design, the rigidity of the materials that make up the laminate, and the range of motion the device can undergo.

scholarly journals UV-C decontamination for N95 emergency reuse: Quantitative dose validation with photochromic indicators

2020 ◽  
Author(s):  
Alison Su ◽  
Samantha M. Grist ◽  
Alisha Geldert ◽  
Anjali Gopal ◽  
Amy E. Herr
Keyword(s):  
Dynamic Range ◽  
Medical Personnel ◽  
Consumer Electronics ◽  
Critical Design ◽  
Design Considerations ◽  
Optical Attenuators ◽  
N95 Respirators ◽  
Dose Variation ◽  
Uv C

With COVID-19 N95 respirator shortages, frontline medical personnel are forced to reuse this disposable − but sophisticated − multilayer textile respirator. Widely used for decontamination of nonporous surfaces, UV-C light has germicidal efficacy on porous, non-planar N95 respirators when ≥1.0 J/cm^2 dose is applied across all surfaces. Here, we address outstanding limitations of photochromic indicators (qualitative readout and insufficient dynamic range) and introduce a photochromic UV-C dose quantification technique for: (1) design of UV-C treatments and (2) in-process UV-C dose validation. Our methodology establishes that color-changing dosimetry can achieve the necessary accuracy (>90%), uncertainty (<10%), and UV-C specificity (>95%). Furthermore, we adapt consumer electronics for accessible quantitative readout and extend the dynamic range >10× using optical attenuators. In a measurement infeasible with radiometers, we observe striking 20× dose variation over 3D N95 facepieces. By transforming photochromic indicators into quantitative dosimeters, we illuminate critical design considerations for both photochromic indicators and UV-C decontamination.

Morphological behavior of compatibilized ternary blends prepared by mechanical mixing

1993 ◽  
Vol 51 ◽  
pp. 1200-1201
Author(s):  
S.D. Smith ◽  
R.J. Spontak ◽  
D.H. Melik ◽  
S.M. Buehler ◽  
K.M. Kerr ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Diblock Copolymers ◽  
Ternary Blends ◽  
Mechanical Mixing ◽  
Design Considerations ◽  
Covalently Bonded ◽  
Homopolymer Blends ◽  
Emulsifying Agent ◽  
Surface Active ◽  
Low Entropy

When blended together, homopolymers A and B will normally macrophase-separate into relatively large (≫1 μm) A-rich and B-rich phases, between which exists poor interfacial adhesion, due to a low entropy of mixing. The size scale of phase separation in such a blend can be reduced, and the extent of interfacial A-B contact and entanglement enhanced, via addition of an emulsifying agent such as an AB diblock copolymer. Diblock copolymers consist of a long sequence of A monomers covalently bonded to a long sequence of B monomers. These materials are surface-active and decrease interfacial tension between immiscible phases much in the same way as do small-molecule surfactants. Previous studies have clearly demonstrated the utility of block copolymers in compatibilizing homopolymer blends and enhancing blend properties such as fracture toughness. It is now recognized that optimization of emulsified ternary blends relies upon design considerations such as sufficient block penetration into a macrophase (to avoid block slip) and prevention of a copolymer multilayer at the A-B interface (to avoid intralayer failure).

Theoretical And Practical Design Considerations for Ultra-High Resolution Electron Lenses

1980 ◽  
Vol 38 ◽  
pp. 266-269
Author(s):  
Y. Harada ◽  
K. Tsuno ◽  
Y. Arai
Keyword(s):  
Optical Properties ◽  
High Resolution ◽  
Chromatic Aberration ◽  
Point Of View ◽  
Pole Piece ◽  
Axial Field ◽  
Design Considerations ◽  
Resolution Electron ◽  
Practical Design ◽  
Peak Flux

Magnetic objective lenses, from the point of view of pole piece geometry, can he roughly classified into two types, viz., symmetrical and asymmetrical. In the case of the former, the optical properties have been calculated by several authors1-3) and the results would appear to suggest that, in order to reduce the spherical and chromatic aberration coefficients, Cs and Cc, it is necessary to decrease the half-width value of the axial field distribution and to increase the peak flux density. The expressions for either minimum Cs or minimum Cc were presented in the form of ‘universal’ curves by Mulvey and Wallington4).

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