bluuebunny/crossref_metadata_2025_split huggingface dataset:
Entanglement protection in higher-dimensional systems
Authors: Singh Ashutosh , Sinha Urbasi 
Published: July 2022

Abstract
The inevitable dissipative interaction of an entangled quantum system with its environment causes degradation in quantum correlations present in the system. This can lead to a finite-time disappearance of entanglement, which is known as Entanglement Sudden Death (ESD). Here, we consider an initially entangled qubit-qutrit system and a dissipative noise which leads to ESD, and propose a set of local unitary operations, which when applied on the qubit, qutrit, or both subsystems during the decoherence process, cause ESD to be hastened, delayed, or avoided altogether, depending on its time of application. Delay and avoidance of ESD may find practical application in quantum information processing protocols that would otherwise suffer due to short lifetime of entanglement. The physical implementation of these local unitaries is discussed in the context of an atomic system. The simulation results of such ESD manipulations are presented for two different classes of initially entangled qubit-qutrit systems. A prescription for generalization of this scheme to a qutrit-qutrit system is given. This technique for entanglement protection in the noisy environment is compared with other related techniques such as weak measurement reversal, dynamic decoupling, and quantum Zeno effect.
Influence of uranium dioxide and reflector surface on neutron yields of the nuclear hybrid fusion-fission reaction using MCUNED code
Authors: Reda Sonia M , Khalil Emad I , Anwar Dalia , Youssef Ahmed 
Published: July 2022

Abstract
The goal of the present work is to demonstrate the effects of adding uranium dioxide (UO2) to deuterium fuel in the fusion-fission hybrid reactions. The effectiveness of applying a reflector surface on the neutron yield in D-D and D-UO2 reactions has been investigated. The neutrons yielded from the fusion reactions were considered as a neutron source for fission reactions. For this purpose, MCNPX and its extension, the MCUNED code, for D-D fusion processes and UO2 fission reactions were used to calculate the neutron yield and the generated power. Using externally evaluated nuclear data libraries, MCUNED is capable of light ion transport. The D (d), (n) 3He reaction with 0.25 gm of deuterium and the fission reactions with 0.25 and 1.0 gm of UO2 were utilized. The results showed that the calculated neutron flux from the D-D fusion reaction increased by a considerable amount when applying the reflector surface. Adding 1.0 gm of UO2 to deuterium fuel enhanced neutron flux by 4.95 times on average, outside the source with the reflector surface. The calculated power increased by about 3-folds when 1.0 gm of UO2 was added. Despite the narrow cross section of the D-D reactions used in this study, it was found that utilizing the reflector surface and UO2 or depleted uranium with restrictive high masses may be able to multiply the generated neutrons and the resulting power.
Numerical investigation of helicopter hover state of flight enhancement by applying active flow control over helicopter special tip airfoil
Authors: Tawfik Tarek Mokhtar , Abdelrahman M M , Hassan YK 
Published: July 2022

Abstract
In conventional helicopter there are many operation limits and constraints, one of them is the maximum take-off weight and ability of main rotor to produce thrust during the hover mode of flight. In this study a numerical investigation is performed to show the effect of active flow control technique over the helicopter tip blade in hover mode to enhance the main rotor ability to produce lift by improving total performance of used airfoil. Active flow control applied to upper airfoil surface of blade tip close to the leading edge to control the boundary layer by adding momentum using small oscillating jet. The advantage of this technique comes from the small energy required to enrich the boundary layer which we use very small jet for excitation. Model is formed in 2D and is numerically investigated for airfoil used in main rotor blade tip with known geometry and performance parameter for clean rotor given by NASA test stand. Results shows very good impact on the hover mode in 2D model which gives enhancement in the overall performance represented by lift to drag ratio in the used tip airfoil in different case study used depending on the study plan that considered various excitation parameter. More than 60% increase in total performance represented by lift to drag ratio is obtained using suitable parameter and excitation point.
Optimization of friction stir welding AA6082-T6 parameters using analysis of variance and grey relational analysis
Authors: El-Zathry N E , Hassan A I , El-Betar A A , Sabry I 
Published: July 2022

Abstract
Friction stir welding (FSW) is a solid-state welding process, which has a significant role in solid-state welding processes for nonferrous alloys. Conventional arc welding processes for aluminum alloys such as metal inert gas (MIG) and tungsten inert gas (TIG) are replaced by FSW. The effect of FSW parameters such as rotational and traverse speeds, tool geometry, plunge depth, tilt angle, etc., on weld quality were considered in several optimization studies. Hence, the effect of fixture position is included in this study. Multi-criteria decision-making (MDCM) techniques such as grey relational analysis (GRA) were used to determine the optimal condition among experimental runs designed by response surface methodology (RSM). The Taguchi method was widely applied with MCDM techniques. Therefore, the experiments were conducted according to response surface methodology. Input parameters were (14, 16 and 18) mm for shoulder diameter (SD), (0.0, 0.2 and 0.4) mm for plunge depth (PD), and (30, 60 and 90) mm for fixture position (FP), which is the distance between fixture bolts used to fix the welded plate. The results obtained by GRA were similar to the ANOVA optimizer, and the optimum process conditions are shoulder diameter of 14 mm, plunge depth of 0.2 mm, and fixture position of 60 mm.
Influence of different shaped charge parameters on jet penetration into metallic target
Authors: El-Sayed E E , Elshenawy T A , Shaker M A , Riad A M 
Published: July 2022

Abstract
In this paper, Autodyn-2D hydrocode is used to investigate the influence of shaped charge parameters on penetration performance. Two different algorithms of Autodyn-2D hydrocode are used to predict the jet penetration depthsinto steel target; they are: i)jetting analyses algorithm, and ii) jet formation and penetration algorithm. To validate the predictions of the present work, Autodyn hydrocode is fed with the data of tested shaped charges with different liner thicknesses. The predicted penetration depths are compared with the corresponding experimental measurements; good agreement is generally obtained. Then, the shaped charge with liner thickness of 1.1mm, that gives the maximum jet penetration into steel target, is selected to study the influence of other different shaped charge parameters on its penetration performance. These parameters include form, material and thickness of liner, standoff distance and type of high explosive material. The influence of each studied parameter is evaluated by comparing the jet penetration performance with that of the selected shaped charge. Samples of the obtained predicted results showing the influence of each shaped charge parameter on jet formation and its penetration depth into steel target are presented and discussed. Four configurations are simulated into Autodyn-2D hydrocode considering the parameters that improve the penetration performance of the selected shaped charge. The obtained predictions result in the replacement of RDX by HMX explosive type and increasing the standoff distance from 29 to 40mm of the selected shaped charge will improve its penetration capability by 28.5%.
Evaluation of through holes blades effect on wells turbine performance for wave energy conversion
Authors: Khalil M G , Kotb A T , Nawar M A , Mohamed M H 
Published: July 2022

Abstract
The air Wells turbine is one of the most prevalent and promising wave energy harvesting systems. Wells turbine converts the reciprocating energy of the ocean and sea waves into mechanical energy. However, it is characterized by low performance, a narrow operating range, and low efficiency. In this article, the effect of a number of through holes that are distributed along the blade span was evaluated. Typically, the number of holes, diameter, and position from the trailing edge were subjected in this parametric study. The performance parameters of the turbine ( The torque coefficient, turbine efficiency, and stagnation pressure drop coefficient ) were numerically studied at various flow coefficient values to express the Wells turbine performance. The CFD results for a tested turbine model with a blade profile of NACA0015 and solidity of 0.644 were validated against published experimental data. It was found that a turbine blade with seven holes of 2%C in diameter and attached at a distance of 2%C from the trailing edge demonstrated the best performance characteristics. Furthermore, the new through holes blade increased the maximum value of torque coefficient by 1.16 compared to the conventional blade at a flow coefficient of 0.225.
Reinforcement learning reward function in unmanned aerial vehicle control tasks
Authors: Tovarnov M S , Bykov N V 
Published: July 2022

Abstract
This paper presents a new reward function that can be used for deep reinforcement learning in unmanned aerial vehicle (UAV) control and navigation problems. The reward function is based on the construction and estimation of the time of simplified trajectories to the target, which are third-order Bezier curves. This reward function can be applied unchanged to solve problems in both two-dimensional and three-dimensional virtual environments. The effectiveness of the reward function was tested in a newly developed virtual environment, namely, a simplified two-dimensional environment describing the dynamics of UAV control and flight, taking into account the forces of thrust, inertia, gravity, and aerodynamic drag. In this formulation, three tasks of UAV control and navigation were successfully solved: UAV flight to a given point in space, avoidance of interception by another UAV, and organization of interception of one UAV by another. The three most relevant modern deep reinforcement learning algorithms, Soft actor-critic, Deep Deterministic Policy Gradient, and Twin Delayed Deep Deterministic Policy Gradient were used. All three algorithms performed well, indicating the effectiveness of the selected reward function.
Stabilization of a pendulum on an elastic foundation using a multilayer perceptron
Authors: Ivanova A D , Kharin N V , Smirnova V V , Tufanova E E , Sachenkov O A 
Published: July 2022

Abstract
The article describes the solution to the problem of stabilizing a nonlinear system using machine learning methods. Despite the existence of classical approaches for solving the optimal control problem, the need for other approaches still remains. Nowadays, solving this class of problems using artificial intelligence has become popular Neural networks are one of the promising directions in this area. The article describes a model of multilayer perceptron. A pendulum on an elastic foundation was chosen as a dynamic system for the study. To train the neural network supervised learning (backpropagation) algorithm was used. Different variants of the training sample were proposed: with pre-learning and synchronous learning. The article shows the process of stabilization of a pendulum on an elastic foundation. The closed system was built and a method for a numerical solution was implemented.
Theoretical basis, concept and methodology of control and correction of turbojet engines thrust asymmetry
Authors: Yu Burova A 
Published: July 2022

Abstract
The issues related to the study of the additional possibility of tightening the control of mutual conformity of the quality of turbojet engines in the conditions of their serial production and subsequent operation in the power plants of medium-haul aircraft and long-haul aircraft are considered. The purpose of the study is to develop new principles and corresponding digital methods for monitoring and correcting the thrust asymmetry of serial turbojet engines to improve the flight safety of medium-haul aircrafts and long-haul aircrafts with such engines. Methods of mathematical statistics and software modeling were used in the study. The results of the development of the concept and methodology of control and minimization of the thrust asymmetry of turbojet engines of one series in such conditions are presented.
Design study of a single bunch selection method for neutron TOF experiment at RAON heavy ion accelerator
Authors: Moon S.H. , Jeong J.Y. , Kwak D. , Jang J.H. , Chai K.-B. , Chung M. 
Published: July 2022

Abstract
To enable neutron time-of-flight (TOF) experiments at the RAON heavy-ion accelerator facility, we propose a single bunch beam selection method by combining a fast chopper and double gap buncher in the low-energy beam transport (LEBT) section. The fast chopper operates with switching times of tens of ns to convert a CW beam into a pulsed beam.
Then, the double gap buncher performs bunching to shorten the beam pulse duration to less than one radio frequency quadrupole (RFQ) cycle.
Ideally, a single isolated bunch can be achieved after the RFQ.
In this study, we discuss the system design of the proposed single bunch selection scheme and present detailed beam dynamics simulations.
Response of moist and dry processes in atmospheric blocking to climate change
Authors: Steinfeld Daniel , Sprenger Michael , Beyerle Urs , Pfahl Stephan 
Published: July 2022

Abstract
Weather extremes are often associated with atmospheric blocking, but how the underlying physical processes leading to blocking respond to climate change is not yet fully understood. Here we track blocks as upper-level negative potential vorticity (PV) anomalies and apply a Lagrangian analysis to 100 years of present-day (∼2000) and future (∼2100, under the RCP8.5 scenario) climate simulations restarted from the Community Earth System Model–Large Ensemble Project runs (CESM-LENS) to identify different physical processes and quantify how their relative importance changes in a warmer and more humid climate. The trajectories reveal two contrasting airstreams that both contribute to the formation and maintenance of blocking: latent heating in strongly ascending airstreams (moist processes) and quasi-adiabatic flow near the tropopause with weak radiative cooling (dry processes). Both are reproduced remarkably well when compared against ERA-Interim reanalysis, and their relative importance varies regionally and seasonally. The response of blocks to climate change is complex and differs regionally, with a general increase in the importance of moist processes due to stronger latent heating (+1 K in the median over the Northern Hemisphere) and a larger fraction (+15%) of strongly heated warm conveyor belt air masses, most pronounced over the storm tracks. Future blocks become larger (+7%) and their negative PV anomaly slightly intensifies (+0.8%). Using a Theil–Sen regression model, we propose that the increase in size and intensity is related to the increase in latent heating, resulting in stronger cross-isentropic transport of air with low PV into the blocking anticyclones. Our findings provide evidence that moist processes become more important for the large-scale atmospheric circulation in the midlatitudes, with the potential for larger and more intense blocks.
Space Syntax Analysis for Assessment of TOD Area
Authors: Poerbo H W , Harimardika M R , Sugangga M , Soelaiman T M A , Imanullah H I , Yasin M P E 
Published: July 2022

Abstract
Currently, there are standards for planning of Transit Oriented Development (TOD) areas. These standards are published by various research institutions and governments in various developed countries. In Indonesia, the standard for planning for transit-oriented areas usually refers to the Regulation of the Minister of Agrarian Affairs and Spatial Planning (ATR) number 16 of 2017 concerning Guidelines for the Development of Transit Oriented Areas. The research aims to find an instrument to assess the proposed development of a city area into a TOD area. There are currently many proposals for the development of the TOD area in Greater Jakarta and other big cities in Indonesia, because several areas around the planned mass public transport station are suitable to be developed as a TOD area. The construction of the MRT and LRT lines is the trigger for this development. The local government will be assisted by instrument in the process of evaluating the proposed TOD area plan, whether it will comply with the rules of a transit-oriented area. The research begins by selecting a series of TOD area design criteria that are suitable to economic, social, and climatic conditions in Indonesia. The selected criteria were tested by using the space syntax method to assess the existing areas that were planned to be developed. The results of the assessment of the existing area are then compared with the assessment of the area according to the proposed plan.
Web Portals as an Effective Means of Managing Cities to Ensure Sustainable Development and Solve Environmental Problems
Authors: Rasskasova N 
Published: July 2022

Abstract
This article is devoted to examining sustainable development and environmental problems in cities through analysis of open data from Russian and foreign web portals. The analysis is aimed at revealing the advantages and disadvantages of open data portals; the information obtained can be applied when creating portals for cities in the Russian Federation (specifically, the city of Chelyabinsk). Developing open data portals is an effective method of managing cities to ensure sustainable development. Actively implementing information technologies into urban management systems can improve control over the quality and promptness of city management, help manage city resources, and use resources rationally to solve a number of urban problems, including environmental ones.
Improving ecological monitoring system in the areas of oil and gas production development
Authors: Grafkina M V , Telishevskaya A L 
Published: July 2022

Abstract
The territory of the Russian Federation has various underground resources, among other things the largest reserves of fuel resources of oil and gas, in light of this oil and gas production is especially developed in Russia. Oil and gas production is one of the environmentally hazardous types of economic activity and has a negative impact on the natural environment, by means of disturbance of soils condition, pollution of surface watercourses and underground water, emissions of pollutants into the atmosphere (hydrocarbons, nitrogen dioxide, sulfur oxide, carbon monoxide, solid pollutants, etc.). The chemical pollutions, as a result of the ingress of the pollutants in the time of combustion of associated gas or the seepage of oil slimes through the walls of unutilized sludge pits, are dangerous. Russia has a well-developed ecological monitoring system. However, often there are not enough investigations as to the changing state of environmental components in developing oil production centers. This is due to the need for further development of the monitoring system. Analysis of existing monitoring stations data for the environmental conditions will allow to determine the trends of pollution changes and develop recommendations for improving ecological monitoring system in oil and gas production areas.
Complex processing of wood debarking waste as a factor of environmental safety
Authors: Eskin V D , Krivorotova A I 
Published: July 2022

Abstract
In recent decades, the development of a modern industrial enterprise is impossible without considering the issue of complex processing or disposal of waste of the main production. This issue is very acute for the enterprises of the wood processing industry. The processing of wood waste should be considered not only as a factor of rational and environmentally safe use of forests, but also as a factor providing comprehensive processing of wood without increasing the amount of its harvesting and allowing production of new environmentally safe materials in constructing or other purposes. The paper presents the technological aspects of the production of innovative board composite materials made without binders based on debarking waste of coniferous wood raw materials and the studies` results of its operational properties. The produced composite is completely eco-friendly and biodegradable. The manufacturing technology consists of the mechanical activation of the tree bark in a hydrodynamic dispersant. Thanks to this treatment, the bark particles change their microstructure, acquire a large number of active centers and autocoherent properties, which make it possible to create slab materials based on it without introducing binding components and various types of additives into the composition.
Characteristics of sago growth and production in two sago-producing centers in the Kendari Peninsula, Southeast Sulawesi
Authors: Yusuf D N , Muhidin  , Sutariati G A K , Rakian T C , Arman  , Leomo S , Erawan D , Alam S 
Published: July 2022

Abstract
Sago is an alternative food source crop, especially in Southeast Sulawesi. From year to year, the area of sago crops tends to decrease due to conversion and limited cultivation levels. Therefore, to preserve sago, it is necessary to identify and characterize sago growing in Kendari Peninsula. This study aims to identify and describe morphologically the types of sago found in sago-producing centers in the Kendari peninsula, Southeast Sulawesi. Observations were made on the different types of sago growing at two locations of sago planting centers. Parameter measurements were carried out on stem height, bark thickness, leaf width, leaf length, stem diameter, harvest age, and production per stem. The results showed that there were four types of sago found, namely roe (Metroxylon sagu R.), runggamanu (Metroxylon rumphii M.), and barowila (Metroxylon longispinum M.) and sago rui (Metroxylon microcantum). There are differences in sago vegetative and generative growth due to differences in growing environmental conditions and local climate. In general, the dominant types of sago in both locations were sago roe (Metroxylon sagus R.) and sago runggamanu (Metroxylon rumphii M.).
Seed treatments to control Burkholderia glumae on rice seeds in the screenhouse
Authors: Sari S P , Safni I , Lubis L 
Published: July 2022

Abstract

Burkholderia glumae is a rice seed-borne pathogen that cause severe yield which have impact to the food sustainability in the future. As none of control methods was effective, seed treatment is an alternative control technique to manage the disease. This study was aimed to determine the effective control method using liquid smoke, clove oil, citronella oil and copper hydroxide fungicide against B. glumae bacteria at the screen house, Faculty of Agriculture, Universitas Sumatera Utara, Medan, from December 2020 to May 2021. This study used a completely randomized design (CRD) non-factorial with 10 treatments, including positive control, negative control, 5% and 7% of liquid smoke, 2% of clove oil, 1% and 3% of citronella oil, 2% and 5% of copperhydroxide fungicides, with 3 replications. The results showed that the lowest percentage of disease incidence was the rice plants treated by 2% and 5% copperhydroxide fungicides (0.71%). The lowest percentage of disease severity was found in the copper hydroxide 2% and 5% of fungicide treatment (0.71%). The 5% copper hydroxide fungicide treatment had the lowest mean percentage of empty grain, (9.11%). The 5% of clove oil treatment gave the highest rice grain production, with an average of 57.50 g.