Top 6 Engrxiv Papers Today in Engineering


2.261 Mikeys
#1. A RECIPROCITY THEOREM FOR BUCKLING STATES OF VAT (STEERED FIBER) COMPOSITE PLATES
Sergey Selyugin
In the present paper the flat composite plates in buckling are studied. The plates have a symmetric lay-up and loaded along their piecewise-smooth contour by the in-plane forces. The consideration employs the Classical Lamination Plate Theory. A reciprocity theorem for the buckling states of the plate is derived and analyzed. The theorem may be used as a benchmark for the structural analysis and the optimization software.
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engrXiv: "A RECIPROCITY THEOREM FOR BUCKLING STATES OF VAT (STEERED FIBER) COMPOSITE PLATES" - https://t.co/dFxumgDDcu #engineering
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2.008 Mikeys
#2. Effect of Hydrogen and Carbon Monoxide Addition to Methane on Laminar Burning Velocity
Mohammadrasool Morovatiyan, Martia Shahsavan, Mammadbaghir Baghirzade, John Hunter Mack
Exhaust gas recirculation (EGR) in spark-ignited engines is a key technique to reduce in-cylinder NOx production by decreasing the combustion temperature. The major species of the exhaust gas in rich combustion of natural gas are hydrogen and carbon monoxide, which can subsequently be recirculated to the cylinders using EGR. In this study, the effect of hydrogen and carbon monoxide addition to methane on laminar burning velocity and flame morphological structure is investigated. Due to the broad flammability limit and high burning velocity of hydrogen compared to methane, this addition to the gaseous mixture leads to an increase in burning velocity, less emissions production, and a boost to the thermal efficiency of internal combustion engines. Premixed CH4-H2-CO-Air flames are experimentally investigated using an optically accessible constant volume combustion chamber (CVCC) accompanied with a high-speed Z-type Schlieren imaging system. Furthermore, a numerical code is applied to quantify the laminar burning velocity based on the...
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engrXiv: "Effect of Hydrogen and Carbon Monoxide Addition to Methane on Laminar Burning Velocity" - https://t.co/cj2Nzc1m3G #engineering
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Total Words: 5180
Unqiue Words: 1574

2.008 Mikeys
#3. Screening Compounds for Fast Pyrolysis and Catalytic Biofuel Upgrading Using Artificial Neural Networks
Travis Kessler, Thomas Schwartz, Hsi-Wu Wong, John Hunter Mack
There is significant interest among researchers in finding economically sustainable alternatives to fossil-derived drop-in fuels and fuel additives. Fast pyrolysis, a method for converting biomass into liquid hydrocarbons with the potential for use as fuels or fuel additives, is a promising technology that can be two to three times less expensive at scale when compared to alternative approaches such as gasification and fermentation. However, many bio-oils directly derived from fast pyrolysis have a high oxygen content and high acidity, indicating poor performance in diesel engines when used as fuels or fuel additives. Thus, a combination of selective fast pyrolysis and chemical catalysis could produce tuned bioblendstocks that perform optimally in diesel engines. The variance in performance for derived compounds introduces a feedback loop in researching acceptable fuels and fuel additives, as various combustion properties for these compounds must be determined after pyrolysis and catalytic upgrading occurs. The present work aims...
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engrXiv: "Screening Compounds for Fast Pyrolysis and Catalytic Biofuel Upgrading Using Artificial Neural Networks" - https://t.co/NwilaDlSF3 #engineering
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2.008 Mikeys
#4. Implementing Natural Gas in a Compression Ignition Cycle Using Noble Gas Addition
Martia Shahsavan, Mohammadrasool Morovatiyan, Mammadbaghir Baghirzade, John Hunter Mack
Natural gas is known as a relatively clean fossil fuel due to its low carbon to hydrogen ratio compared to other transportation fuels, which yields a reduction of carbon monoxide, carbon dioxide, and unburned hydrocarbons emissions. However, it has a low cetane number, which makes it a difficult fuel for use in compression ignition engines. A potential solution for this issue can be adding small amounts of argon, as a noble gas with a low specific heat to modify the intake conditions. In this numerical study, a commercial compression ignition engine has been modeled to evaluate the auto-ignition of natural gas with the modified intake conditions. Different amounts of argon added to the intake air are examined in order to attain the optimal operating conditions. A detailed chemistry solver is implemented on a 53-species chemical kinetics mechanism to calculate the rate constants. The results show that compression ignition of natural gas can be achieved by adding small amounts of argon to the intake air. It drastically increases the...
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engrXiv: "Implementing Natural Gas in a Compression Ignition Cycle Using Noble Gas Addition" - https://t.co/9xOMYtVw1H #engineering
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2.005 Mikeys
#5. Hidden Markov Model: Tutorial
Benyamin Ghojogh, Fakhri Karray, Mark Crowley
This is a tutorial paper for Hidden Markov Model (HMM). First, we briefly review the background on Expectation Maximization (EM), Lagrange multiplier, factor graph, the sum-product algorithm, the max-product algorithm, and belief propagation by the forward-backward procedure. Then, we introduce probabilistic graphical models including Markov random field and Bayesian network. Markov property and Discrete Time Markov Chain (DTMC) are also introduced. We, then, explain likelihood estimation and EM in HMM in technical details. We explain evaluation in HMM where direct calculation and the forward-backward belief propagation are both explained. Afterwards, estimation in HMM is covered where both the greedy approach and the Viterbi algorithm are detailed. Then, we explain how to train HMM using EM and the Baum-Welch algorithm. We also explain how to use HMM in some applications such as speech and action recognition.
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engrXiv: "Hidden Markov Model: Tutorial" - https://t.co/xEYIEDcaEz #engineering
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2.002 Mikeys
#6. Experimental Investigation of the Effects of Hydrogen Addition with Diesel on Performance and Emission of a Single Cylinder Diesel Engine
Earth Prints, Mirza Hassan Hashmi, Nitin Dubey
Need of the hour in present day scenario is to cope with energy crisis and human life in India and around the globe which is associated with depletion in the percentage of petroleum products and increase in the share of pollution caused due to emissions from diesel operated engines. This work tries to address these two major concern with the use of alternative fuel for diesel engine .A lot of research is going on the use of alternative and innovative fuels in the word, among those one of the most promising alternative ought to be hydrogen for being a clean and non carbon in nature. However various ongoing researches shown hydrogen blending to be proved to show positive effect on performance and emission of a diesel engine, which has to be carried forwarded. In this work a flow rate of 4 lpm, 6 lpm and 8 lpm respectively blend of hydrogen proportion where used along which diesel at loading at a constant speed of 1500 rpm to determine various engine performance parameters such as brake thermal efficiency, brake specific fuel...
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engrXiv: "Experimental Investigation of the Effects of Hydrogen Addition with Diesel on Performance and Emission of a Single Cylinder Diesel Engine" - https://t.co/gMBpfRLck6 #engineering
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