Top 10 Engrxiv Papers Today


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#1. Pneumatic Braking Mechanism
Rishi Anand, Shwetang Dubey, Siddharth Singh, Shailendra Pratap Verma
Pneumatic Braking Mechanism is an implementation of regenerative braking system for automobiles. It uses pneumatic compression to store the kinetic energy of the vehicle. The compressed air is used to produce electricity through a turbine, and then used for supercharging the engine of the automobile. The complete mechanism can be divided into two parts: - Braking - Regeneration Regeneration mechanism can be further subdivided into: - Expansion - Supercharging The rotational motion of wheels of the vehicle is used to drive reciprocating compressors. Compressors are engaged with the help of a clutch and crankshaft unit when brakes are applied. Compression process converts the kinetic energy of the vehicle in the form of compressed air. In the process, vehicle loses its energy and comes to a standstill. The compressed air goes to a turbine and generator unit where expansion takes place and electricity is produced. The outlet air from turbine at lower pressure is used for supercharging.
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engrXiv: "Pneumatic Braking Mechanism" - https://t.co/nV9oDZpXmf #engineering
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Sample Sizes : None.
Authors: 4
Total Words: 2277
Unqiue Words: 740

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#2. Data on the Configuration Design of Internet-Connected Home Cooling Systems by Engineering Students
Christopher McComb, Jonathan Cagan, Kenneth Kotovsky
This experiment was carried out to record the step-by-step actions that humans take in solving a configuration design problem, either in small teams or individually. Specifically, study participants were tasked with configuring an internet-connected system of products to maintain temperature within a home, subject to cost constraints. Every participant was given access to a computer-based design interface that allowed them to construct and assess solutions. The interface was also used to record the data that is presented here. In total, data was collected for 68 participants, and each participant was allowed to perform 50 design actions in solving the configuration design problem. Major results based on the data presented here have been reported separately, including initial behavioral analysis and design pattern assessments via Markovian modeling.
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Authors: 3
Total Words: 1281
Unqiue Words: 570

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#3. Comparison of Various Encryption Algorithms for Securing Data
Dr. Kiramat
Data encryption is the process of protecting information. It protects its availability, privacy and integrity. To write this article we have study about information security using cryptography technique. After the analyzing different techniques of encryption, we are proposing Advance Encryption Standard (AES). The AES has the better security compared others encryption algorithm and prevent data from Spoofing. It is very efficient in both hardware and software.
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engrXiv: "Comparison of Various Encryption Algorithms for Securing Data" - https://t.co/er8sVL96nx #engineering
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Authors: 1
Total Words: 3000
Unqiue Words: 1215

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#4. Measuring and Predicting Sooting Tendencies of Oxygenates, Alkanes, Alkenes, Cycloalkanes, and Aromatics on a Unified Scale
Dhrubajyoti Das, Peter St. John, Charles McEnally, Seonah Kim, Lisa D. Pfefferle
Soot from internal combustion engines negatively affects health and climate. Soot emissions might be reduced through the expanded usage of appropriate biomass-derived fuels. Databases of sooting indices, based on measuring some aspect of sooting behavior in a standardized combustion environment, are useful in providing information on the comparative sooting tendencies of different fuels or pure compounds. However, newer biofuels have varied chemical structures including both aromatic and oxygenated functional groups, making an accurate measurement or prediction of their sooting tendency difficult. In this work, we propose a unified sooting tendency database for pure compounds, including both regular and oxygenated hydrocarbons, which is based on combining two disparate databases of yield-based sooting tendency measurements in the literature. Unification of the different databases was made possible by leveraging the greater dynamic range of the color ratio pyrometry soot diagnostic. This unified database contains a substantial...
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A set of codes used to perform the regressions and generate figures for the unified YSI database

Repository: ysi-fragment-prediction
User: pstjohn
Language: Jupyter Notebook
Stargazers: 1
Subscribers: 1
Forks: 0
Open Issues: 0
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Sample Sizes : None.
Authors: 5
Total Words: 13417
Unqiue Words: 4399

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#5. Computations of heave added mass and damping coefficients of some axisymmetric bodies using WAMIT
Adi Kurniawan
The heave added mass and damping coefficients of some axisymmetric rigid bodies computed using WAMIT are compared with those computed using semi-analytical methods.
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engrXiv: "Computations of heave added mass and damping coefficients of some axisymmetric bodies using WAMIT" - https://t.co/D9L9bZM1al #engineering
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Sample Sizes : None.
Authors: 1
Total Words: 1609
Unqiue Words: 494

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#6. Design Optimization of Permanent Magnet
Ebrahimi
A multilevel ant algorithm is developed to optimize the design process of a surface mounted permanent magnet synchronous motor. The motor properties are calculated using an exact magnetic equivalent circuit based analytical model. This model takes into account the iron saturation, the slot stray fluxes and the spatial harmonics of rotor and stator fluxes. The effectiveness of the proposed analytical model is verified in comparison with measurement of a handmade prototype. Based on this analytical model the air gap flux density, torque and induced voltage of the prototype motor are predicted. For an effective selection of motor parameters, a multipurpose optimization algorithm is developed, which is based on the distributed multilevel ant-stigmergy algorithm. The analytical model together with the optimization algorithm represents a very effective tool for design of permanent magnet synchronous motor without any need for time consuming finite element programs.
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Authors: 1
Total Words: 4488
Unqiue Words: 1359

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#7. Electrospun Polyethene oxide-graphite composite anode for solid-state lithium-ion batteries
Mikel Arrese-Igor, Norbert Radacsi
Current lithium-ion batteries are close to reaching their physicochemical energy density limit. Moreover, they present high operation risks regarding their liquid electrolyte. Solid-state batteries are a promising alternative to overcome these problems. They offer safe operation, and potentially improved energy and power density. The option of operating at higher voltages has led to the possibility of employing high capacity electrodes. In this study, the synthesis of a nanostructured anode through electrospinning was carried out. This electrode is based on polymer nanofibres with intercalated graphite particles. The effect of molecular weight, voltage, temperature and humidity has been studied for the formation of smooth and uniform nanofibres. At the optimized conditions, Polyethylene oxide (PEO)-Polyethylene glycol (PEG) nanofibres with diameters around 600 nm were successfully electrospun. The effect of graphite loading on the electrospinning of this solution was also studied. A 30% graphite particle loading in the final...
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engrXiv: "Electrospun Polyethene oxide-graphite composite anode for solid-state lithium-ion batteries" - https://t.co/JUoWZu8b4I #engineering
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Sample Sizes : None.
Authors: 2
Total Words: 5955
Unqiue Words: 2060

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#8. Study on Shell-and-Tube Heat Exchanger Models with Different Degree of Complexity for Process Simulation and Control Design
Javier Bonilla
Many commercial solar thermal power plants rely on indirect thermal storage systems in order to provide a stable and reliable power supply, where the working fluid is commonly thermal oil and the storage fluid is molten salt. The thermal oil - molten salt heat exchanger control strategies, to charge and discharge the thermal storage system, strongly affect the performance of the whole plant. Shell-and-tube heat exchangers are the most common type of heat exchangers used in these facilities. With the aim of developing advanced control strategies accurate and fast dynamic models of shell-and-tube heat exchangers are essential. For this reason, several shell-and-tube heat exchanger models with different degrees of complexity have been studied, analyzed and validated against experimental data from the CIEMAT-PSA molten salt test loop for thermal energy systems facility. Simulation results are compared in steady-state as well as transient predictions in order to determine the required complexity of the model to yield accurate results.
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Authors: 1
Total Words: 8988
Unqiue Words: 2471

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#9. IoT Network Segmentation When Sensors Fail
Daniel Chen
This draft presents a fault-tolerant network segmentation system for the Internet of Things (IoT). When devices of the IoT malfunction or fail, recovery needs to be performed to maintain system functionalities. In modern ad hoc networks like mobile ad hoc networks (MANETs), devices usually form dynamical clusters to collaboratively handle highly diverse sensing environments. To recover cluster information when parts of the IoT are not functioning, this study develops a centroid-free network segmentation algorithm that diverts dependency on centroids into empirical-space kernel matrices. The original problem of handling nonvectorial centroids is deduced to kernel matrix estimation.
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Authors: 1
Total Words: 3944
Unqiue Words: 1385

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#10. A Pull-down Dynamic Analysis of Two-Span Steel Frames Subjected to Progressive Collapse
Mohammadjavad Esfandiari, Girum Urgessa
Progressive collapse, also known as disproportionate collapse, describes a chain reaction of structural element failures in which a primary structural element failure results in the failure of adjoining structural elements. It eventually causes widespread structural damages and a disproportionate collapse. While high level finite-element models incorporating non-linear dynamic analysis will produce more realistic results in progressive collapse scenarios, they are computationally time consuming. Therefore, the development of a non-linear time history pull-down model that is validated with experimental results would be beneficial for producing acceptable and efficient design solutions, particularly for practicing structural engineers. In this paper, a non-linear time history pull-down model of a two-span steel frame is analyzed in ETABS. The ETABS model results are compared with experimental results of two steel frames with two-spans conducted by the National Institute of Standards and Technology (NIST). The NIST experiments...
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Sample Sizes : None.
Authors: 2
Total Words: 2280
Unqiue Words: 991

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