Top 7 Engrxiv Papers Today in Engineering


2.009 Mikeys
#1. Sub-Threshold Slope and ON/OFF Current variation in Nano-Scale MOSFETs
Raja N Mir
The Multi Gate transistors (MGT) have been used to improve the transistor device performance at the nanometer scales. MGTs alleviate many problems in the planar devices due to tighter control of the gate on the channel. In this paper the change in the Fin Architecture and Gate Length of the MOS device, is correlated with the Subthreshold Slope (SS) and ON/OFF current ratio. The study is done by conducting experiments and three-dimensional simulations.
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engrXiv: "Sub-Threshold Slope and ON/OFF Current variation in Nano-Scale MOSFETs" - https://t.co/iilcXUqNNm #engineering
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2.007 Mikeys
#2. Options of Natural Gas Pipeline Reassignment for Hydrogen: Cost Assessment for a Germany Case Study
Simonas Cerniauskas, Antonio Jose Chavez Junco, Thomas Grube, Martin Robinius, Detlef Stolten
The uncertain role of the natural gas infrastructure in the decarbonized energy system and the limitations of hydrogen blending raise the question of whether natural gas pipelines can be economically utilized for the transport of hydrogen. To investigate this question, this study derives cost functions for the selected pipeline reassignment methods. By applying geospatial hydrogen supply chain modeling, the technical and economic potential of natural gas pipeline reassignment during a hydrogen market introduction is assessed. The results of this study show a technically viable potential of more than 80% of the analyzed representative German pipeline network. A countrywide analysis shows a cost reduction potential of the transmission system by 20% in comparison to a newly built hydrogen pipeline system. Moreover, investigation of the supply chain indicates that above the hydrogen demand of 300 kt p.a., pipeline reassignment emerges as the least expensive hydrogen supply pathway.
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engrXiv: "Options of Natural Gas Pipeline Reassignment for Hydrogen: Cost Assessment for a Germany Case Study" - https://t.co/bWl7sPi3Gn #engineering
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Authors: 5
Total Words: 8041
Unqiue Words: 2470

2.005 Mikeys
#3. Understanding the deformation gradient in Abaqus and key guidelines for anisotropic hyperelastic user material subroutines (UMATs)
David Nolan, Caitriona Lally, Patrick McGarry
This tutorial paper provides a step-by-step guide to developing a comprehensive understanding of the different forms of the deformation gradient used in Abaqus, and outlines a number of key issues that must be considered when developing an Abaqus user defined material subroutine (UMAT) in which the Cauchy stress is computed from the deformation gradient. Firstly, we examine the "classical" forms of global and local deformation gradients. We then show that Abaqus/Standard does not use the classical form of the local deformation gradient when continuum elements are used, and we highlight the important implications for UMAT development. We outline the key steps that must be implemented in developing an anisotropic fibre-reinforced hyperelastic UMAT for use with continuum elements and local orientation systems. We also demonstrate that a classical local deformation gradient is provided by Abaqus/Standard if structural (shell and membrane) elements are used, and by Abaqus/Explicit for all element types. We emphasise, however, that the...
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engrXiv: "Understanding the deformation gradient in Abaqus and key guidelines for anisotropic hyperelastic user material subroutines (UMATs)" - https://t.co/cHmTGjkFHh #engineering
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2.005 Mikeys
#4. Linking the installation response of screw piles to soil strength and ultimate capacity
James Hambleton, Sam Stanier
A perceived advantage of screw-type foundations is the ability infer aspects of foundation performance from quantities measured or observed during installation, especially the installation torque. A particular concept widely used in practice is to correlate installation torque to ultimate capacity. This notion has proven useful as a field verification technique despite the absence of validated models that relate key variables of interest, such as installation torque, axial (crowd) force, geometrical parameters, and soil strength. This paper considers previous work by the co-authors and collaborators on analytical, numerical, and physical modelling of screw piles to relate the quantities measured or controlled during installation (e.g., installation torque) to the ultimate capacity and soil strength. Attention is given to saturated clay as a particular soil type amenable to simplified analysis. An analytical model for a single-helix pile is considered as a means of directly relating the ultimate capacity and undrained shear...
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engrXiv: "Linking the installation response of screw piles to soil strength and ultimate capacity" - https://t.co/5dKSOs7yPT #engineering
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2.005 Mikeys
#5. A Grid search-based response surface methodology for the optimum biosynthesis of silver nanoparticles using Clerodendrum splendens
aarcha jayakumar
In this paper, we propose a grid search algorithm using response surface methodology (RSM) for optimizing the biosynthesis of silver nanoparticles (AgNPs). A biological method using hot water (HW) Clerodendrum splendens (C. splendens) leaf extract is adopted for the discussion. The RSM integrated central composite design (CCD) is used to derive a quadratic objective function to model the yield of AgNPs by accounting the effects of the processing parameters, namely, C. splendens concentration, pH, and the reaction time. The optimization of the resulting objective function, which is a challenging multi-variate non-convex problem, is solved using a grid search approach. The respective optimum values of the parameters are found to be 54 mL, pH 12, and 23 min and the corresponding AgNPs yield is experimentally verified.
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engrXiv: "A Grid search-based response surface methodology for the optimum biosynthesis of silver nanoparticles using Clerodendrum splendens" - https://t.co/UmdYNKKG5o #engineering
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2.002 Mikeys
#6. Effects of different parameters on inelastic buckling behavior of composite concrete-filled steel tubes
Hossein Alimohammadi, Mohammadali Lotfollahi Yaghin, Mostafa Dalvi Esfahani
Composite columns are one of the most used cross-sections in various buildings and bridges. In this research, the impact of different parameters such as the effect of the eccentricity of loads or the change in the horizontal distance of the loading profiles in buckling of the composite columns with double IPE cross-sections as well as the impact of different value of slenderness on buckling of composite box columns has been investigated. Based on the results, the steel member's yielding will be delayed by filling the steel sections with concrete. Also, an increase in the amount of composite column capacity is directly related to the associative ratio of composite concrete. In other words, increasing the ratio of the concrete surface leads to greater capacity which is caused by being filled with concrete.
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engrXiv: "Effects of different parameters on inelastic buckling behavior of composite concrete-filled steel tubes" - https://t.co/kYbjcmKIYA #engineering
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2.002 Mikeys
#7. Reevaluating the jet breakup regime diagram
Ben Trettel
Identifying the regime of a liquid jet is necessary to determine the physical mechanisms causing breakup and consequently how to model the jet. Existing regime diagrams are based on a small amount of data classified by superficial visual characteristics, making these diagrams too inaccurate to reliably determine the correct regime. A more accurate regime diagram is developed using a large compilation of breakup length data combined with theory where the data is sparse. Improvements in the regime diagram include a new regime, the addition of the nozzle critical Reynolds number and the turbulence intensity as variables, and the recognition that how the regimes change with increasing velocity (i.e., Rayleigh to first wind-induced to second wind-induced to atomization) is not universal.
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engrXiv: "Reevaluating the jet breakup regime diagram" - https://t.co/ShOnxRxy7F #engineering
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Total Words: 12104
Unqiue Words: 2768

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