bluuebunny/crossref_metadata_2025_split huggingface dataset:
Tire mobility numbers and vehicles performance evaluation based on empirical approaches
Authors: Hendy A 
Published: July 2022

Abstract
The wheel mobility number is a dimension less parameter that has a great and effective influence on prediction the off-road wheeled vehicle’s performance. The wheel mobility number is affected by soil strength, vehicle’s weight, and tires geometry. Different types of published wheel mobility numbers were collected and theoretically investigated to compare their vehicle performance. The major goal of this paper is to investigate the impact of tires parameters on vehicle mobility. For this, the tire geometry was measured using experimental testing at various tires inflation pressures. A theoretical comparison is carried out to the investigate the effect of soil cone index, tire geometry and vehicle weight on mobility numbers. The theoretical results are arranged in three worked zones and the vehicle performance in terms of net traction and tractive efficiency using empirical approaches were predicted. A comparison between predicted results and published results gives a good correlation.
Multi-fidelity structural analysis of a beam-shaped wing
Authors: Osama M , Ahmed M Y , Saleh S , Khalil M 
Published: July 2022

Abstract
As far as integrity and proper operation of a flying vehicle are concerned, modal analysis of the wing is a crucial design procedure. This procedure aims to define the natural frequencies of the wing structure to avoid resonance under fluctuating aerodynamic loads. This procedure becomes more significant if the wing to forced to perform pitching oscillation. The present study aims to define the dynamic behavior of a rectangular wing with NACA 0009 airfoil using the Euler-Bernoulli beam theory by treating the wing as a cantilever beam. To assess the validity of this treatment and the theoretical method as a design tool, both numerical simulations and experimental measurements are applied on the wing. Results of this multi-fidelity modal analysis define the natural frequencies of the wing. The good agreement of the three methods confirms the validity of treating the wing in concern as a simple cantilever beam.
Impact of changing nozzle profiles on thermal and structural loads acting on nozzle wall
Authors: Saleh M , Saleh S , Zayed A 
Published: July 2022

Abstract
A nozzle of rockets is a window for the combustion chamber to the ambient air. It is subjected to several thermal and mechanical loads acting on the internal wall. So, the nozzle structural behavior has a significant impact on the mission achievement. The aim of this paper is studying a variety of nozzle profiles shape and its influences on structural behavior. Computational fluid dynamics software was applied to investigate the temperature and pressure on the internal wall of the nozzle while observing if there is any change at nozzle ballistic performance or not. Four different convergent profiles had been investigated to study its effect on structural stresses acting on nozzle wall. The results showed body temperature distribution, static pressure and thermal-structural stresses at nozzle wall. Changing the internal profile of the nozzle convergent caused significant change in pressure and temperature loads acting on nozzle wall structure. Conical shape convergent profile produced less stresses at throat section by 19.8% compared to original profile.
Design and development of dual-acting soft actuator for assistance and rehabilitation of finger flexion and extension
Authors: Elsherif AR , Awad M I , Maged S A , Ramzy A 
Published: July 2022

Abstract
The powerfulness of Soft robotic systems is relied to the safe performance. In addition to other advantages: the flexibility and deformability. Developing an assistive tool for Hand rehabilitation through soft pneumatic actuated hand gloves is an improved and suitable way for helping post stroke subjects. The Pneumatic network (Pneu-Net) actuators are soft actuators composed of pneumatic chambers actuates when pressurised with air. Dual acting soft pneumatic Pneu-Net actuator is developed as a part for building the glove, the actuator is designed for assisting both finger flexion and extension motions. Pneumatic network (Pneu-net) actuator is developed and design geometry effect is studied, mainly the influence of the dual actuators on each other in addition to the effect of the number of air chambers per each actuator. Design selection based on the finite element analysis and experimental testing, bending angle and energy efficiency parameters in addition to comfort and safe performance are the main criteria of concern.
Implementation of hybrid RSM-GA optimization techniques in underwater friction stir welding
Authors: Sabry I , El-Zathry N E , Gadallah N , Abdel Ghafaar M 
Published: July 2022

Abstract
Standard friction stir welding process parameters have a considerable impact on the quality of functional parts produced by underwater friction stir welding (UWFSW) with additive water. Hybrid statistical techniques may be used to optimize operating parameters in order to improve the aim function. The tensile strength (UTS)of parts fabricated with UWFSW by Al 6063 material in accordance with ASTMD638-14 tests is investigated in this study. In the construction of test specimens, three parameters were varied: rotational speed from 1000 to 1800 rpm, travel speed from 4 to 10 mm/s, and shoulder diameter from 10 to 20 mm. The response surface methodology (RSM) based central composite design (CCD) matrix for the parametric combination was constructed using a second-order polynomial fitting model. The maximum UTS of testing samples on the 201T universal testing machine (UTM) was 208.27 MPa. These process parameters are also optimized using hybrid optimization approaches such as response surface methodology- genetic algorithm (RSM-GA). RSM-GA had the highest precision of 98.99 percent, which resulted in optimal characteristics such as rotating speed 1800 rpm, travelling speed 4 mm/s, and shoulder diameter 15 mm, which resulted in a maximum tensile strength of 199.0212 MPa.
Non-linear optical characteristics of sand glass
Authors: Hebatalrahman H , Salah A , Hasabelnaby S , Khalil A 
Published: July 2022

Abstract
In this work the nonlinear optical characteristics of sand glass which is the origin of quartz crystal were evaluated, sand glass particles from mining site waste were prepared by washing, drying, magnetic separation and sieving. The particles are soaked in sulphonic acid H2 SO4 acidic solution with 30% concentration for 100 hours, the new compound with optical characteristics was formed at different volume fractions of sandglass such as 20%,40%,60%, and 80% respectively. The new machine was developed for manufacturing the new compound from sand glass. The optical nonlinear absorption coefficient of the sand glass-ceramics material was investigated using the Z-scan technique, provided with nanosecond pulses of second harmonic (green Nd:YAG laser with 532nm wavelength). The effect of lattice structure and particles concentration on the non-linear optical properties were also discussed. The conclusions and recommendations for the best material and concertation for nonlinear optical material were mentioned. The research end with conclusions and recommendation for the development of new optical materials based on micro and nanoparticles from natural resources.
The effect of operating conditions on the conversion of the agricultural waste into 5-hdroxymethylfurfural
Authors: Elmously M , Abu-Elyazeed O M , Emara A 
Published: July 2022

Abstract
The bio-refinery currently is the main concern of the scientific society, while the bio-refinery is considered as an alternative approach to fulfil the demands of the oil alternatives and the energy production. As its goal to gradually be replacing the dependence on the fossil-fuel resources, the 5-Hydroxymethylfurfural is one of the important intermediate compounds in the chemical industries due to its high potential availability from different lignocellulose wastes. However, the 5-Hydroxymethylfurfural is considered as raw material for producing petroleum refining industry, chemical resistant resin, as well biofuel production and other bio-alternatives materials to replace the petrochemicals materials. Therefore, the main objective of the present study is to determine the optimum process conditions of conversion of the agriculture waste into 5-Hydroxymethylfurfural (HMF), such as a solvent type, catalyst type, reaction time and temperature. The experimental setup is designed for integration of the pre-treatment, hydrolysis, and dehydration process in one-stage high pressurized vessel. The results show that 5-HMF is successfully produced with high yield by the dehydration of glucose in Dimethyl Sulfoxide (DMSO) as a solvent. Additionally, increasing the temperature up to 250°C improves the glucose conversion and raises the HMF-yield up to 47wt%. However, the reaction time is found to be more critical, where by increasing the reaction time the yield increases up to a certain limit then it decreases and this may be due to the rise in the dissociation rate to by products. Furthermore, the DMSO is approved as a solvent where it is highly selective of HMF, and it has low side reactions compared to water/butanol.
Neural networks in solving differential equations
Authors: Gorikhovskii V I , Evdokimova T O , Poletansky V A 
Published: July 2022

Abstract
The paper considers the possibility of using neural networks in solving differential equations and systems. The paper investigates the influence of various basic neural network topologies, various optimizers, activation functions, fast access links and some heuristic methods on the quality of neural network training and the accuracy of solving the differential equation.
Numerical modeling of unsteady subsonic flow over the conical shape body
Authors: Babakov A V 
Published: July 2022

Abstract
The article presents the results of a numerical study of the unsteady vortex motion of gas arising over the conical body with a segmental bottom surface for various angles of attack in a subsonic flow regime. The simulation is based on the viscous compressible gas model (Navier–Stokes model). For various attack angles, the patterns of vortex flow around the conical surface of the body, in the area of its conjugation with the segmental bottom surface and in the near wake are presented. Data on non-stationary behavior and the magnitude of pressure in the conjugation area are given. For numerical simulation the method of finite volumes is used. Taking into account phenomena of the flow separation, the computational grids used have condensation to the surface of the body. Numerical calculations were carried out on the basis of parallel algorithms of the method and were realized on multiprocessor computing complexes.
Supersymmetric dS

n
solutions for n
⩾ 5in D
= 11 supergravity
Authors: Farotti D , Gutowski J B 
Published: July 2022

Abstract
We determine the necessary and sufficient conditions for warped product dS

n
solutions, 5 ⩽ n ⩽ 10, to preserve supersymmetry in D = 11 supergravity, without assuming factorization of the Killing spinors. We prove that for 7 ⩽ n ⩽ 10, all such solutions are flat, with vanishing four-form. We also show that the only warped product dS
6 solutions are either the maximally supersymmetric AdS
7 × S
4 solution, or

R

1
,
6

×

N

4

where N
4 is hyperKähler, with vanishing four-form. Supersymmetric warped product dS
5 solutions are then classified; it is shown that all such solutions are generalized M5-brane configurations, for which the transverse space is

R
×

N

4

, and N
4 is a hyperKähler manifold. If the four-form is covariantly constant, then N
4 admits a hyperKähler potential.
Entanglement dynamics of a hard-core quantum gas during a Joule expansion
Authors: Ares Filiberto , Scopa Stefano , Wald Sascha 
Published: July 2022

Abstract
We study the entanglement dynamics of a one-dimensional hard-core quantum gas initially confined in a box of size L with saturated density ρ = 1. The gas is suddenly released into a region of size 2L by moving one of the box edges. We show that the analytic prediction for the entanglement entropy obtained from quantum fluctuating hydrodynamics holds quantitatively true even after several reflections of the gas against the box edges. We further investigate the long time limit t/L ≫ 1 where a Floquet picture of the non-equilibrium dynamics emerges and hydrodynamics eventually breaks down.
Environmentally balanced preconditions for use of logging residues in forests of Ukrainian Carpathians for energy production
Authors: Vasylyshyn R , Lakyda  , Soshenskyi O , Lakyda M , Melnyk O , Slusarchuk V 
Published: July 2022

Abstract
Use of woody biomass of logging residues at plots where different types of logging has occurred as a planned management activity has to be based on the analysis of relevant environmental risks. These risks include biodiversity losses, soil fertility reduction, and formation of dangerous volumes of flammable materials in forests during the fire-hazardous period, which is especially relevant on plots with high recreational load. As a result of the research, we propose indicative utilization rates for logging residues at sites where care or final cuts occur in spruce, beech and fir dominated stands in various growth conditions. The information basis of the research is formed by the research data on distribution of the relevant forest stands in different types of forest growth conditions, as well as on influence of forest growth conditions on processes of biological destruction and accumulation of forest flammable materials at plots with intensive recreational load. The proposed utilization rates for logging residues serve as an information component in the process of formation of regional strategy of forest bioenergy development.
Optimal sizing and techno-economic analysis of a hybrid solar PV/wind/diesel generator system
Authors: Tay Godfred , Acakpovi Amevi , Adjei Patrick , Aggrey George K. , Sowah Robert , Kofi Daniel , Afonope Maxwell , Sulley Mustapha 
Published: July 2022

Abstract
Hybrid power systems that combine wind and solar PV technology have been widely employed for power generation, particularly for electrification in remote and islanding locations, because they are more cost-effective and reliable than traditional power systems. This article intends to develop an environmentally friendly and cost-effective hybrid power system for selected critical loads in the Avuto community of Ghana. Following the acquisition of site data, a hybrid solar PV, wind, diesel generator, and converter analysis was conducted using HOMER software to establish the appropriate sizing of system components based on technical and economic parameters such as load served, annual electricity production, net present cost (NPC), emission, Operating cost, Fuel consumption and energy cost (COE). Based on the optimization computational results, it can be stated that the combination of system components, including solar photovoltaic, wind turbine, and diesel generator, is a good fit for the application region and might be used for rural and island electrification in the future. The suggested energy system has an LCOE of 0.39 US$/kWh for the 1.08 US$/litre diesel fuel cost and a 3.33-year payback period, with 58.8 kW for PV, 7 units for 3 kW wind turbines, 10 kW for diesel generator, and 6.99 kW for the converter. In terms of emission reduction, the proposed case presented a 55% emission reduction from the base case scenario.
Innovative design of grid connected solar/diesel hybrid system using RETScreen software
Authors: Kofi Daniel , Acakpovi Amevi , Adjei Patrick , Sowah Robert , Aggrey George K. , Tay Godfred , Sulley Mustapha , Afonope Maxwell 
Published: July 2022

Abstract
Accessibility to dependable energy resource is vital to the emerging economy to function appropriately in this contemporary world for both residential and commercial purposes. Technological advancement has opened avenues for more sophisticated technologies to combine multiple energy sources to generate affordable electricity for residential and industrial purposes. The study, therefore aims at analyzing the fiscal benefits of hybrid Solar PV and Diesel Generator (DG) (PV-DG) grid-connected system using RETSceen software. The study focused on a specific location, J. A. Plant Pool Ghana Limited, warehouse Department. The study recommended and proposed an effective design of a hybrid PV-DG grid connected electricity supply for the warehouse Department. The economic viability of the project and the payback period obtained through computation were very attractive. Also, the total revenue of electricity exported to the grid annually and GHG emission reduction were within the standard benchmark. The study finally concurred that renewable energy sources such as solar when hybridized with any other energy systems, lead to a noticeable electrical cost reduction. Therefore, this system design provides multiple benefits, including; improved reliability, reduced emission and significant cost reduction.
Predicting Housing Evacuation Process during Natural Disaster Event Using Pathfinder Simulation, Puuwatu Kendari Real Estate Complex as A Case Study
Authors: Mustakima D , Nurdini A 
Published: July 2022

Abstract
Housing site plan should respond to safety standards for disaster evacuation, especially in Kendari City, Indonesia. It is caused by its geological conditions at high risk of natural disasters such as earthquakes, liquefactions, tsunamis, etc. The study on housing accessibility quality for the evacuation process in Kendari was limited. This study was conducted to identify the evacuation access quality of the housing site plan in Puuwatu Kendari as a case study. The main indicators to measure evacuation access quality are user characters, housing unit layouts, and the width of circulation access including the pedestrian path, road system, and the assembly point. These indicators are analyzed by the Pathfinder application. It is identified that the actual time for the total evacuation process outside of housing units is 44,4 seconds and into the assembly point (the nearest open public space) 103,5seconds. The actual time of evacuation to reach outside of housing units is still in the standard range of 2-3 minutes. On the other hand, the actual time of evacuation to reach open public space is 287 seconds still within the standard 30 minutes. It is caused by the distance of the assembly point in a radius of 60-70 meters. The quality of the assembly point is the main problem for the typical housing site plan in this case study. Respectively, the housing site plan in Kendari and the other similar cities have to be managed to comply with the standard for the disaster evacuation process.
Vulnerability Analysis of Fire Evacuation at Urban Kampong Using Space Syntax Method, Penggilingan Jakarta as a Case Study
Authors: Rosyidah A , Tambunan L , Nurdini A 
Published: July 2022

Abstract
Urban settlements including kampong at DKI Jakarta Province are vulnerable to fire hazards. The fire risk will increase along with the increase of kampong’s population, the density of housing units in the area, and spatial accessibility quality. However, the understanding of urban kampong’s spatial configuration related to the vulnerability degree of fire hazards is limited. The purpose of this study is to identify the vulnerability of urban kampong structures related to fire evacuation. Penggilingan Sub-district of East Jakarta City, DKI Jakarta, and its surrounding area were selected as a case study to represent high-density urban kampong with high fire hazards events. The space syntax analysis is utilized as a tool to analyse the main indicators of spatial vulnerability: connectivity, mean depth, and integration of the area. Connectivity affects the easiness of evacuation during a fire disaster. Meanwhile, integration and mean depth affect the level of accessibility. The correlation of connectivity and integration implies an intelligibility degree that is a supporting parameter of wayfinding. It is identified that several areas in Penggilingan Sub-district are vulnerable to fire in the aspect of evacuation because of their low connectivity and accessibility. The result of this study can be developed as a basis for evacuation planning and fire safety management in the urban dense kampong.
Comparison of Daylight Performance in Three Different Sky Conditions for Various Window Shading Types
Authors: Khidmat R P , Fukuda H , Kustiani  , Sari A A 
Published: July 2022

Abstract
Building sector contributes 40% of total energy consumption. In line with this, passive design strategy should be taken as an essential consideration to bring occupants comfort both thermally and visually. Besides, related to human health, one of the factors that the designer is encouraged to fulfill is the proportional amount of daylight that penetrates the building’s room. The passive strategy to optimize the daylight performance can be approached both from the building orientation and the shading system. This paper will computationally compare the different shading systems from vertical and horizontal louver, perforated metal sheets, and expanded metal shading, aiming to investigate the desirable shading-related design solution for the given condition. The simulated room is virtually situated in three different sun positions: Birmingham, United Kingdom, Jakarta, Indonesia, and Sydney, Australia. The metrics used in this experiment are Useful Daylight Illuminance (UDI). The Rhinoceros and Grasshopper were used to model the intended simulated room, while Ladybug and Honeybee were used to undergo environmental analysis. The results show that the vertical louver LV performs better in the three regions than the rest three compared shading. The experiment results are expected to give an overview which of which is fit for the situation.
Digital Placemaking and Its Effect to The Architectural Development (Case Study: City of Dreams, Macau)
Authors: Kurniawaty G , Horlanso V , Aditama M Y , Larasati D 
Published: July 2022

Abstract
Placemaking is the process of creating a place, with space and users as the main elements, and aims to increase the value of a place. Along with developments of technology especially the digitalization of architecture, the adjustment of the process of creating a place becomes an issue that deserves attention in the field of architecture. Therefore, the term digital placemaking was born as a form of adaptation to the existence of digital interventions on placemaking. This paper aims to determine the role of digital technology in creating a place (placemaking) with an architectural context and knowing the development of design products as a result of technological developments related to placemaking. The methods used in this research are quantitative and qualitative. A Likert scale scoring method is used in the quantitative method to classify the sub-aspects that meet and do not meet the placemaking parameters. The qualitative method used is a grounded theory of the respondents’ open questions which are then packaged in a descriptive discussion. The findings of this study indicate that the level of placemaking fulfilment through digital interventions can be achieved and has the potential to be applied in Indonesia. This is shown by the achievement of the placemaking parameter from a case study of digital placemaking applications in the City of Dreams, Macau. All sub-aspects from the aspects of sociability, uses and activities, as well as access and linkages, meet the placemaking parameter. Almost all sub aspects of comfort and image fulfill the placemaking parameter, except for the sub-historic and green aspects.