bluuebunny/crossref_metadata_2025 huggingface dataset:
Using penalty method in identification of elastic fixed stiffness of frame structure
Authors: Nguyen Xuan Bang , Pham Thai Hoan , Nguyen Duy Duan
Published: August 2023

This paper studies a method to identify the elastic fixed stiffness of the frame structure. The model of the problem is three dimensional structure, linear elastic deformation, pile - soil link is replaced by elastic fixed with stiffness. The problem will be solve by the penalty function method - the minimum of the objective function (which is the total squared error between the measured value and the calculated values particular) - combined with the finite element method. The numerical calculations show that the model, algorithm and calculation program are reliable. The program can be used to identify the elastic fixed stiffness of the frame structure in three dimension, serving to determine the actual working state of the structure, to propose solutions for reinforcement, repairing, improving bearing capacity, prolonging the life of the structure.
Regularities of plastic deformation development in the crack tip vicinity
Authors: Emel’yanov Oleg , Shuvalov Aleksandr
Published: August 2023

When determining the service life of cyclically loaded metal structures at the stage of fatigue crack development, an important role is played by the accuracy of assessing the plastic deformation zone size at the crack tip formed by the tensile overload. Within this zone, after reducing the load to the initial level, the fatigue crack development slows down. Despite the large number of studies in this area, none of the proposed dependencies is currently fully confirmed by experimental results in determining the plasticity zone size. The aim of the work is to assess the size of the plastic deformation zone formed by a single tensile overload. In the work of the finite element method for central-notch specimens and compact tension specimens, an analysis of the stress-strain state in the crack top vicinity is performed. As a calculation, a flat and three-dimensional model was used. Calculations are performed in the Ansys 14.0. Data on the mechanical properties of steels were used: St20, VSt3sp, 09G2S, 15G2SF. With increasing load, the plastic zone size in front of the crack tip was estimated, in the process of reduction, the distribution and length of the fields of residual compressive stresses and the size of the cyclic plastic zone were recorded, the length of which was also determined experimentally using strain gauges with a base of 0.5 mm. To assess the plastic zone size formed by a single tensile overload, a dependence is proposed that takes into account the patterns of plastic deformation development in the vicinity of the fatigue crack tip, and the results of the calculation agree well with the experimental data given in the literature. The obtained expression makes it possible to predict with greater reliability the development of fatigue cracks at variable load amplitudes.
Classification of residential buildings made of local materials in the Kyrgyz Republic and the results of experiments on them
Authors: Mamatov Zhanybek , Sydykov Yzat , Mamatov Samagan
Published: August 2023

This article discusses the classification of hоuses built of local materials, taking into account the regional specifics of the Kyrgyz Republic and based on the analysis and generalization of the practice in thе Central Asian rеgion. Experimental and theoretical studies were conducted on the classified types, based on the results of which a rating was made on the economic component, construction technology and seismic resistance.
Modification of theory A.R. Rzhanitsyn in analysis of multilayer composite beams
Authors: Filatov Vladimir , Hoang Thi Linh Quyen , Dao Ngoc Khoa
Published: August 2023

The article proposes the development of a numerical method for calculating multilayer beams, based on the theory of composite rods by A.R. Rzhanitsyn. The modification of this theory is to simplify the calculation model for a determined class of structures. It is considered multilayer beams composed of same layers of rectangular cross section, with the same physical and mechanical characteristics. The stiffness of all connecting seams is taken equal. In the research the hypothesis of a functional relationship between shear forces in the seams of the structure is taken. This allows the authors to significantly reduce the dimension of the system of resolving differential equations, from n + 2 equations to three for any finite number of layers. Where n -is the number of seams, and, accordingly, the number of shear forces to find in the seams according to the A.R Rzhanitsyn model, n + 1 is the number of layers. A comparison of three models of the above dependence is given. The numerical methodology is based on the approximation of differential equations by difference equations of the method of successive approximations (MSA). This methodology has proven itself well in the calculation of beams, plates, shells for the action of static loads, in calculations in a dynamic setting and for stability, on an elastic foundation. Including multilayer beams and plates. It allows to take into account the finite discontinuities of the load parameters, stiffness parameters of the structure and foundation. The described methodology can find application in the practice of design organizations and enter the educational courses of higher educational institutions of the construction profile.
Optimization of the assembly of cross-truss structures
Authors: Marutyan Aleksandr , Abovyan Avetik , Kravchenko Arkadiy
Published: August 2023

As a result of a review and analytical search based on patent research and development, a new method of assembling cross-truss structures in relation to modules of the Pyatigorsk type has been optimized. The scope of its rational application is outlined, including the construction of new facilities and the reconstruction of existing buildings. The efficiency of assembling such structures in earthquake-resistant construction, including flexible upper floors capable of dampening mechanical vibrations, is noted. The continuation of flexible manufacturing technology in this method of assembly has been revealed, when the entire set of cross-truss structures of full factory readiness is mounted on the construction site in the project position. At the same time, all assembly and welding, transport, installation operations in shop and building conditions are performed by the same personnel due to their high qualifications, which ensures the necessary and sufficient competitiveness under the most difficult conditions of the economic conjuncture.
Identification of parameters of heat supply facilities using telemetry data
Authors: Kitaytseva Elena
Published: August 2023

The purpose of the study is to test the hypothesis about the possibility of using telemetry data to identify heat supply objects. The article considers 4 models approximating telemetry data. Determination coefficients and standard deviations were used to select the best model. The residuals were analyzed for randomness, and the absence of shifts and trends. The consistency of the frequency distribution of the residuals with the normal distribution was checked. The significance of the coefficients included in the approximating functions is estimated. Regression analysis was used to obtain the coefficients of 4 models for each of the 7 objects. The Pearson test confirmed the consistency of the distribution of the residuals of one of the models with a normal distribution for all objects. The significance of the coefficients included in all models was confirmed using Student’s t-distribution. The proposed models take into account the flow rate of the coolant and the temperature of the outside air. The dependences obtained do not contradict the physics of the process, both in the field of observation and beyond its boundaries. With certain restrictions on the coefficients of the model, it is possible to obtain numerical values of the parameters of heat supply objects - the average temperature of the indoor air and the required heating load, which confirms the hypothesis that telemetry data can be used to identify the parameters of heat supply objects.
Formation of a geographic information system in the reliable management of water resources of the Southern Mirzachul channel
Authors: Sadiev Umidjon , Makhmudov Ilkhomjon , Makhmudov Dilbar , Rustamov Shokhrukh , Saydullaev Sirojiddin , Alikabulov Shukhrat , Pirnazarov Ilkhom
Published: August 2023

A geographic information system was formed in the management of water resources based on the hydrographic method. A geographic information system has been developed that provides effective and reliable management of water resources of the South Mirzachul Canal (SMK).
Investigation of the stress-strain state of a gravity dam made of cement-sandand gravel (CSG)
Authors: Tolstikov Victor , Tareq Sohaib
Published: August 2023

The article presents studies of the stress-strain state of a gravity dam of a homogeneous symmetrical profile made of cement-sandand gravel (CSG) on a rocky base. When performing computational studies, the method of full factorial experiment (PFE) was used. Based on this method, we take three variations factors the dam height, slope ratio, and the modulus of deformation of the dam. Calculations were carried out using the CRACK software package. The results allow us to optimize the dam profile (CSG) in a real project and evaluate the reliability of dam structures of this type.
Geosynthetic liner: A modern solution for a concrete dam constructed from particularly lean roller-compacted concrete
Authors: Aniskin Nikolai , Shaytanov Alexey , Shaytanov Mikhail
Published: August 2023

This paper discusses the issue of seepage control in gravity dams made of compacted lean concrete. Several possible design options are outlined. The benefits of using geocomposite impervious blankets are explained. A description of different types of geocomposites is given, including their composition and component parameters. Basic properties of geosynthetics are discussed, along with methods for defining them, such as water permeability, tensile strength, puncture resistance, and ageing. Finally, the main areas for future research are formulated, although it may be helpful to provide more detail on the specific focus of this research.
Influence of cohesion strength in cohesive soils onchannel bed erosion
Authors: Khazratov A.N. , Bazarov O.Sh. , Jumayev A.R. , Bobomurodov F.F. , Mamatov N.Z.
Published: August 2023

The results of experimental studies on the mechanical properties of cohesive soils associated with the use in the study of the erosion process are presented. The influence of the cohesion strength of cohesive soil on erosion is described. The relationship between the erosionflow velocities and cohesion strength has been obtained.
Justification parameters in the fertilize coulter for local use of mineral fertilizing
Authors: Batirov Z.L. , Toirov I.J. , Makhmudov Y.E.
Published: August 2023

The article describes the design and technological process of the fertilizecoulter, which ensures the placement of fertilizers in two layers simultaneously with the formation of ridges and ensures uniform distribution of fertilizers to a given depth with a ribbon width, presents the scheme of the chisel cultivator fertilize coulter and the scheme of the fertilizewide with a three-way divider, and also justifies the parameters of the fertilizecoulter for local application of mineral fertilizers. In addition, the results of theoretical and experimental studies on the justification of the technology of fertilization and the development of a combined machine and a universal chisel cultivator - fertilizer are presented. A formula is proposed for determining the depth of the stroke of the tuck coulter, a formula for determining the diameter of the outlet of the collecting part of the tuck guide and the length of the guiding part of the tuck guide, and regression levels are given that adequately describe the uneven distribution of the fertilizer flow along the cross section of the tuck guide. Recommendations are given on the norms and methods of fertilization, depending on soil conditions.
Calculation of parameters of subsurface ridges in a steady flow of groundwater channels
Authors: Sobir Eshev , Israil Gʻayimnazarov , Ashraf Rahimov , Furqat Bobomurodov , Dilovar Arziyeva
Published: August 2023

In solving the problems associated with the design and operation of large canals with many subsurface channels, it is important to determine the parameters of the parameters of the grids moving under the bottom and the flow rates. To date, a large number of field and laboratory research data on the movement of groups in the world have been obtained. Attempts have been made by some authors to summarize this information, but so far they have not been able to obtain perfectly reliable results. Therefore, new suggestions are being made by researchers to improve the formulas previously obtained.
Geological and hydrodynamic modeling as a tool for improving the methodology of designing the development of hydrocarbon deposits at the final stage
Authors: Shevtsov V.M. , Asadova Kh.B. , Djamilov А.F. , Omonov S.P. , Abdurakhmonova S.P.
Published: August 2023

The main task of design and development of hydrocarbon fields is the most complete extraction of their geological reserves with maximum economic efficiency. To solve this problem, the present work improves the methodology of development design in the direction of maintaining a stable operating fund, by sidetracking in idle and low-yield wells of fields at the late stage of development, the basis is geological and hydrodynamic modeling of reservoir parameters and filtration processes of reservoir fluids. The adaptation of the development history and its subsequent prediction allows optimal and cost-effective designing of the hydrocarbon field development using high-technology workover (HWR) of idle and marginal wells in order to restore their operation with higher productivity.
Design parameters of water intake chambers on water supply channels of pumping stations
Authors: Uralov B. , Eshev S. , Norkobilov A. , Vokhidov O. , Rakhimov A. , Arzieva D. , Salimbayeva I.
Published: August 2023

The research is devoted to improving the working conditions of chamber water intakes of pumping stations (PS) on water supply channels, which is one of the main factors determining the efficiency of operation of pumping units and stations. An analysis of the current state of the operating conditions of chamber water intakes according to field surveys and literary sources shows that the dimensions of the water intake chambers were assigned based on the minimum energy loss in the suction pipeline of the pump, which, in conditions of high turbidity of water, leads to siltation and complicates the operation of pumping stations. When the water intake chambers are silted, its hydraulic resistance increases, air vortex funnels are formed, the water supply of the pump decreases and the likelihood of cavitation phenomena increases. A significant amount of work has been devoted to the issues of improving the hydraulic characteristics of the flow in the fore chamber and water intake chambers. Therefore, without duplicating them, we conducted research to establish the effect of silting of the chambers on the value of the hydraulic resistance of the suction pipeline and to develop measures to improve the hydraulic characteristics of the intake chamber under conditions of operation in a suspension-carrying flow. To solve the problem, a laboratory stand was made that simulates hydraulic processes in natural conditions based on modeling methods, taking into account the preservation of the constancy of the main similarity criteria.
Acoustophoresis separation of particles based on motion modes via tilted-angle standing surface acoustic wave driven by a unidirectional transducer
Authors: Chen Chen , Wang Yuting , An Keyu , Ren Zhongyuan
Published: August 2023

Acoustophoresis separation technique has attracted great attention due to its superior properties, such as biocompatibility, non-contact, label-free and high-efficiency. In this paper, separation of particles based on motion modes via tilt angle standing surface acoustic wave (TaSSAW) driven by a unidirectional transducer is developed theoretically. It is verified that the designed electrode width controlled unidirectional transducers are effective to improve the intensity of the acoustic field and the acoustic radiation force of the particles in the channel. The results show that when the density and compressibility of the particles are close to those of the fluid and the particle shape is close to spherical, the influences of fluid viscosity and particle shape on the acoustic radiation force are negligible. It is found that in the TaSSAW system the motion modes of the particles are divided into locked mode and drift mode, and they depend on the fluid velocity, acoustic field intensity and tilt angle. polystyrene (PS) particles with radii of 4 and 5 µm are separated based on the differences of motion modes. For further smaller size difference (4.5 and 5 µm) particles, the separation is also realized successfully by making particles move in the same drift mode.
A Novel Approach for clone app detection using VADER’s Algorithm
Authors: Antad Sonali , Khamkar Shreyas , Khambayate Ayush , Khandare Om , Khaire Atharva , Khambadkar Prasad , Khanchandni Deep
Published: August 2023

Software that imitates the capabilities of legitimate, legally responsible, and authentic applications is known as a fraudulent web application. It’s critical to keep track of which mobile applications are secure and which aren’t as the number of them in our daily lives increases. One cannot judge the truth, and the only basis for judging each application is the opposing viewpoints that are stated for each application. Once the false program has been installed, the perpetrators carry out retaliatory acts such as aggressive ad display to recoup revenue, intercepting sensitive data from your system, polluting the impact device, and so forth. Users frequently cannot tell the difference between legitimate and fraudulent applications By developing a place where people can ask questions before installing the program, It is suggested to employ sentiment analysis (VADERS), which is a revolutionary method for detecting fraudulent apps.. The outcome is determined by the ratings and comments provided by users who have already used the application. As a result, we will use sentiment analysis to examine the viewpoints once more. Sentiment analysis will be carried out using the VADERS approach, which analyses text.
Prevention of Fake Comments using web3
Authors: Nithya T. , Varsheni A. Amrita , Brindha S.
Published: August 2023

The volume of information on the internet is currently rising dramatically. Social media platforms/e-commerce market place is producing a lot of data, including reviews, comments, and opinions, every day. As there are a number of fake reviews should incorporate Spam detection to produce a genuine opinion. Fake reviews are growing problem in online shopping, and they have a significant impact on consumer’s decision-making. Many people today base their decisions when choosing a product or service on social media opinions. Because so many false or phoney evaluations have been written by businesses or individuals for a variety of reasons, detecting opinion spam is a difficult and time-consuming task. They produce fictitious reviews to deceive users or automated detection systems by elevating or degrading the reputations of their target products in order to elevate or lower them. In this article, we’ll regulate it by leveraging blockchain technology to make the review system more authentic by allowing only legitimate product purchasers to submit evaluations using their account credentials. We use the Ethereum blockchain to authenticate user credentials, and we only permit verified users to purchase things. Also, we only permit customers to leave reviews or comments on products, ensuring that the reviews are accurate.
Evaluating Impact of Skill Oriented Courses on Women Empowerment Using Machine Learning
Authors: Paul P Blessy , Kurian Cini
Published: August 2023

A nation can not advance fully without the advancement of its women. The conventional way of life for a woman restricted to her family has changed in modern-times. The level of education and employment that women have acquired has an impact on women’s empowerment. On this occasion, it should be investigated whether vocational education is necessary for women employment and whether all women who receive education find employment and are satisfied with their jobs. This research examines the contribution of vocational training on women’s empowerment by gathering data from working women. The machine learning algorithms used here to assess the affects of skill-oriented courses on employability include Artificial Neural Networks (ANN), Support Vector Machines (SVM), Naive Bayes, Random Forest, and Decision Tree. The ANN algorithm was used to perform a more accurate evaluation.
Song Recommendation based on user’s Activity using Ensemble Learning and Clustering
Authors: Joshi Deepali , Gade Akshay , Savale Phalguni , Bhujbal Vinay , Goje Pranavraj , Mhamane Saniya
Published: August 2023

The Song Recommendation System Based on User Schedule project is designed to provide users with personalized music recommendations that match their daily activities and mood swings. With a busy and hectic schedule, it can be challenging to find time to select music that matches a user’s current activity and mood. This project aims to provide a solution to this problem by analyzing the user’s daily schedule, including their planned activities and time of day, and using machine learning algorithms to recommend songs that fit their mood and energy level during each activity. The project utilizes a variety of technologies, such as React.js for the front-end and various machine learning algorithms using python for the back-end, to provide a user-friendly interface that allows users to input their schedules and receive song recommendations.
Autism Spectrum Disorder Detection Using Enhanced Convolutional Neural Network and Wearable Sensors
Authors: Haroon A. Syed , Padma T.
Published: August 2023

Stereotypical Motor Movements (SMMs) may seriously impede learning and social relationships are one of the distinctive and typical postural or motor behaviours linked with autism spectrum disorders (ASDs). A reliable infrastructure for automatic and quick SMM detection is provided by wireless retail sensor technology, which would facilitate targeted intervention and perhaps provide early warning of meltdown occurrences. However, because of significant inter- and intra-subject variability that is challenging for handmade features to handle, the detection and quantification of SMM patterns remain challenging. In this work, we suggest using the Enhanced Convolutional Neural Network (ECNN) to extract distinguishing characteristics directly from multi-sensor accelerometer inputs. Parameters of the ECNN are tuned using whale optimization. Results with Enhanced convolutional neural networks produce accurate and robust SMM detectors.
Framework for privacy preserving credential issuance and verification system using soulbound token
Authors: Reddy Siddhant , Kushwaha Dharmender Singh
Published: August 2023

This paper proposes a framework for privacy-preserving credential issuance and verification over the public blockchain. The credential used in this framework is a soulbound token (SBT), a non-transferrable non-fungible token (NFT) verifiable on the blockchain. Once the issuing organization issues the credential, this framework gives the holder complete control of the credential. This privacy-preserving property allows the holder to selectively disclose the credential attributes in the verification process. The framework proposed suggests a decentralized credential recovery mechanism if the credential holder loses their private key. This paper compares this framework’s efficiency with different schemes based on privacy-preserving, selective disclosure, and decentralized credential recovery. This paper also compares the overhead for credential issuance and verification with Merkle trees. This paper also discusses the real-world use cases where this framework can be applied.
Cyber-Attacks in IoT-enabled Cyber-physical Systems
Authors: SS Latha , Goud K. Mani Sai , Reddy P. Muni Sai Chetan , Reddy P. Surendra , Arun P. Bharath
Published: August 2023

Cyber physical systems (CPS) that are Internet of Things (IoT) enabled might be difficult to secure since security measures designed for general data / value through the development (IT / OT) systems may not work as well in a CPS environment. Consequently, this research provides a two-level ensemble attack detection and attribution framework created for CPS, and more particularly in an industrial control system (ICS). For identifying assaults in unbalanced ICS environments, a decision tree integrated to an unique ensemble deep representation learning model is created at the first extent. An ensemble deep neural network is created for assault features at the second level. Applying actual data collections from the gas pipeline and water treatment system, Findings show that the suggested type is more effective than other competing methods with a similar level of computational complexity.
Quoi de neuf dans les affections des poches gutturales ?
Authors: Schambourg Morgane
Published: August 2023

Mycose, empyème ou tympanisme et arthropathie temporo-hyoïdienne constituent les affections les plus courantes des poches gutturales. D’un pronostic vital, et parfois sportif, éminemment variables, elles peuvent induire une exsanguination fulgurante, une dysphagie, une dyspnée et de multiples autres symptômes neurologiques (ataxie, paralysie faciale, encensement…). Les approches thérapeutiques décrites sont multiples et combinent parfois traitements médical et chirurgical pour une résolution la plus rapide possible afin d’en limiter les séquelles, nécessitant parfois une hospitalisation prolongée et un investissement financier et émotionnel non négligeable. Les techniques chirurgicales mini-invasives (laser transendoscopique, cathétérisation pour embolisation trans-artérielle) prennent le pas sur les approches à ciel ouvert ou directes pour minimiser les risques associés et potentielles séquelles.
Kardiologische Untersuchungen vor geplanter Krebstherapie: wer, was, wann?
Authors: Romann Sebastian Welf , Frey Norbert , Lehmann Lorenz
Published: August 2023

Krebspatienten profitieren von einer kardiologischen Mitbetreuung hinsichtlich einer Reduktion potenzieller kardiotoxischer Ereignisse. Zusätzlich kann in einigen Fällen das onkologische
Therapieziel eher erreicht werden, wenn kardiologische Nebenwirkungen effektiver erkannt und behandelt werden. Die kardiologische Betreuung ist dabei spezifisch zugeschnitten auf die
notwendigen diagnostischen und therapeutischen Maßnahmen, die sich aus den Vorerkrankungen, individuellen Risiken sowie den geplanten onkologischen Therapien ableiten. Die Empfehlungen
hierzu beruhen im Wesentlichen auf den Empfehlungen der aktuellen Leitlinie der Europäischen Gesellschaft für Kardiologie. Die Umsetzung der Vorgaben stellt besondere Herausforderungen an
die behandelnden Ärzte sowohl im niedergelassenen Bereich als auch in den Kliniken. Gleichzeitig sind die Empfehlungen ein wichtiger Schritt zur besseren kardio-onkologischen
Patientenversorgung.
Continuous separation of bacterial cells from large debris using a spiral microfluidic device
Authors: Esan Ayomikun , Vanholsbeeck Frédérique , Swift Simon , McGoverin Cushla M.
Published: August 2023

With the global increase in food exchange, rapid identification and enumeration of bacteria has become crucial for protecting consumers from bacterial contamination. Efficient analysis requires the separation of target particles (e.g., bacterial cells) from food and/or sampling matrices to prevent matrix interference with the detection and analysis of target cells. However, studies on the separation of bacteria-sized particles and defined particles, such as bacterial cells, from heterogeneous debris, such as meat swab suspensions, are limited. In this study, we explore the use of passive-based inertial microfluidics to separate bacterial cells from debris, such as fascia, muscle tissues, and cotton fibers, extracted from ground meat and meat swabs—a novel approach demonstrated for the first time. Our objective is to evaluate the recovery efficiency of bacterial cells from large debris obtained from ground meat and meat swab suspensions using a spiral microfluidic device. In this study, we establish the optimal flow rates and Dean number for continuous bacterial cell and debris separation and a methodology to determine the percentage of debris removed from the sample suspension. Our findings demonstrate an average recovery efficiency of ∼80% for bacterial cells separated from debris in meat swab suspensions, while the average recovery efficiency from ground beef suspensions was ∼70%. Furthermore, approximately 50% of the debris in the ground meat suspension were separated from bacterial cells.
Design of SiO
x
/TiO2@C hierarchical structure for efficient lithium storage
Authors: Zou Junhui , Yuan Shuai , Huang Ying , Du Xianping , Chen Chen , Wang Jiaming
Published: August 2023

The large volume expansion effect and unstable solid electrolyte interface films of SiO
x
-based anode materials have hindered their commercial development. It has been shown that composite doping is a general strategy to solve critical problems. In this study, TiO2-doped core–shell SiO
x

/TiO2@C composites were created using the sol–gel method. On the one hand, the uniformly dispersed TiO2 nanoparticles can alleviate the volume expansion of the SiO
x
active material during the lithiation process. On the other hand, they can react with Li+ to form Li
x
TiO2, thereby increasing the ion diffusion rate in the composite material. The outer carbon shell acts as a protective layer that not only alleviates the volume expansion of the composite, but also improve the electron migration rate of the composite. The prepared SiO
x
/TiO2@C composite has a reversible capacity of 828.2 mA h g−1 (0.2 A g−1 100 cycles). After 500 cycles, it still maintains a reversible capacity of 500 mA h g−1 even at a high current density of 2 A g−1. These findings suggest that SiO
x
/TiO2@C composites have a bright future in applications.
Three-stage laser wakefield accelerator scheme for sub-Joule few-cycle laser pulses
Authors: Lécz Zsolt , Andreev Alexander , Papp Daniel , Kamperidis Christos , Hafz Nasr A M
Published: August 2023

Laser-driven electron acceleration in underdense plasma is a promising route towards the realization of reliable sources of relativistic electrons in the 0.1–1 GeV energy range. Generation of such electron bunches at high repetition rates is hindered by the limited energy per pulse, which inevitably results in very short pulse duration and tight focusing. Compressing the laser energy in time and space allows scientists to use higher plasma density to drive wakefieds, which in turn results in enhanced diffraction and dispersion of the broadband laser pulse. These features make difficult to control the acceleration in the plasma wave and to improve the beam quality. Here we propose a mm-long three-stage acceleration scheme, which allows for tunable injection and optimal acceleration of high-quality electron bunches. The full interaction length is modeled by 3D particle-in-cell simulations.
Hydrodynamics of an odd active surfer in a chiral fluid
Authors: Hosaka Yuto , Golestanian Ramin , Daddi-Moussa-Ider Abdallah
Published: August 2023

We theoretically and computationally study the low-Reynolds-number hydrodynamics of a linear active microswimmer surfing on a compressible thin fluid layer characterized by an odd viscosity. Since the underlying three-dimensional fluid is assumed to be very thin compared to any lateral size of the fluid layer, the model is effectively two-dimensional. In the limit of small odd viscosity compared to the even viscosities of the fluid layer, we obtain analytical expressions for the self-induced flow field, which includes non-reciprocal components due to the odd viscosity. On this basis, we fully analyze the behavior of a single linear swimmer, finding that it follows a circular path, the radius of which is, to leading order, inversely proportional to the magnitude of the odd viscosity. In addition, we show that a pair of swimmers exhibits a wealth of two-body dynamics that depends on the initial relative orientation angles as well as on the propulsion mechanism adopted by each swimmer. In particular, the pusher–pusher and pusher–puller-type swimmer pairs exhibit a generic spiral motion, while the puller–puller pair is found to either co-rotate in the steady state along a circular trajectory or exhibit a more complex chaotic behavior resulting from the interplay between hydrodynamic and steric interactions. Our theoretical predictions may pave the way toward a better understanding of active transport in active chiral fluids with odd viscosity, and may find potential applications in the quantitative microrheological characterization of odd-viscous fluids.
Charge-state effects on charge transfer of helium ions in gold nanosheet
Authors: Sun Ya-Ting , Wang Feng , Pang Su-Na , Mao Fei , Li Chen-Guang
Published: August 2023

We investigate the charge-state effects on charge transfer of helium ions in gold nanosheet using the time-dependent density functional theory non-adiabatically coupled to the molecular dynamics. In order to characterize and extract the charge-state information of incident particles inside the nanosheet, we develop two novel computational methods. It is found that the charge transfer behavior of He ion in gold nanosheet is sensitive to its charge state at the time of incident. Analysis of these results allows us to gain new insights in the interaction between He ions and gold nanosheet. This work validates the ability of current methodology in dealing with ion collisions in materials.
Exact dynamics of multimode periodic input states in coupled waveguide arrays
Authors: Rai Atmadev , Rai Amit
Published: August 2023

In this work, we investigate the quantum state reconstruction of the periodic input state in a 1-D waveguide array. In particular, we consider a single-photon multimode entangled W-state with different periodicities as an input to the array and study the effect of periodicity in the output. For comparison, we also study separable single photon periodic input states. We study the evolution of average photon number and the fidelity of the periodic input state and give the exact solution to investigate the revival of single photon multimode periodic input. Our solution is valid for any number of waveguides in the array. Our findings show the revival of the average photon number and almost complete quantum state reconstruction of the initial multimode entangled state for certain periodicities. The results reported here are significant because multimode-entangled states are essential resources for various applications in the physical implementation of photonic quantum technologies.
Breather, soliton molecules, soliton fusions and fissions, and lump wave of the Caudrey-Dodd-Gibbon equation
Authors: Li Bang-Qing , Ma Yu-Lan
Published: August 2023

In this article, our attention is focused on the exploration of new features of the Caudrey-Dodd-Gibbon (CDG) equation arising from fluid mechanism. We introduce a constant in the transformation, which links the solution and auxiliary function defined in the bilinear form. By constructing different auxiliary function, we calculate the breather solution, one- to three-soliton solutions and lump wave solution. We report that a breather can be generated from a stripe-like soliton. We discover the soliton molecules and their interaction where the maximum amplitude will decrease as they overlap. Two types of heterotypic solitons, namely, soliton fusions and fissions are obtained by attaining their constrain conditions, respectively. We also observe this equation possesses several unique features, such as, having only the two-soliton molecules but not N (N ≥ 3)-soliton molecules, and having the line-like lump wave parallel to the x-axis but not to the t-axis.
Analyzing the atomic pair distribution function of BMT-based nanopowders via X-ray diffraction
Authors: Ghasemifard Mahdi , Ghamari Misagh , Iziy Meysam
Published: August 2023

In this study, we investigate the three-dimensional atomic structure of 0.65[Ba(Mg1/3, Ti2/3)]−0.35[BaTiO3] (BMT-BT) using x-ray diffraction (XRD) with molybdenum radiation (MoKα
1), Rietveld refinement, and the atomic pair distribution function (PDF) technique. We provide an analysis of the advantages of the PDF method for studying the unit cell of electroceramics. The XRD results show that BMT has a bulk crystal structure with a cubic perovskite structure. The new structural information enhances our understanding of the dielectric properties of BMT. The PDF analysis reveals that the average interatomic bond distance in the octahedral TiO6 atomic bond is around 2.8 Å, and the first peak at r = 1.39 Å corresponds to the nearest neighbor M-O distance (M = Ti, Mg, Nb). Additionally, the peak at r = 2.4 Å corresponds to the Ba-O and O-O distances in the MO6 octahedron. Peaks in the PDF data below 1 Å are ignored as they have no physical implications.
Small black string thermodynamics
Authors: Kumar Jyotish , Upadhyay Sudhaker , Kumar Sudhanshu Himanshu
Published: August 2023

We consider a cylindrically symmetric solution for the field equations of Einstein-Hilbert action with a negative cosmological constant in four dimensions. The small statistical fluctuation in the equilibrium thermodynamics of the black string solution is investigated. The small black string under the influence of small statistical fluctuation also follows the first law of thermodynamics. The behaviour of equation of states for black string changes significantly due to the fluctuation. The fluctuation causes instability to the small-sized black string only. Assuming the black string is fluid, the compressibility of the black string is inversely proportional to the fluctuation parameter.
Quantum Steering of Two Tavis-Cummings Atoms with Dipole-Dipole Interaction Under Intrinsic Decoherence
Authors: Khouja Youssef , El Allati Abderrahim
Published: August 2023

Asymmetric and hybrid steering, evaluated by entropic uncertainty inequalities between two identical atoms, is studied in the Tavis-Cummings model with dipole-dipole interaction (DDI) under intrinsic decoherence. The results show that phase decoherence stabilizes the direction during time decay. DDI coupling in the system enhances bi-directionality and stability by avoiding collapses and violations, from which the asymmetric and hybrid steering suffer, respectively. When intrinsic decoherence is introduced, the asymmetric direction becomes stationary when DDI coupling is weak. However, the hybrid direction tends to have the same characteristics when DDI coupling is strong.
Study of the catalytic activity of copper substrates coated with gold and silver foam in alcohol-alkaline media
Authors: Tarantseva K , Korostelyova A , Tarantsev K , Polyanskova E
Published: August 2023

The aim of the study is to find cheap catalysts for the oxidation of ethanol and the release of oxygen in alkaline alcohol fuel cells. The catalytic activity of gold-plated copper substrates coated with silver foam in an ethanol membrane-free fuel cell has been investigated. In this fuel cell, the phase interface between two highly alkaline immiscible liquids acts as a membrane. The highly alkaline medium allows the use of non-platinum catalysts, which, together with the absence of a membrane, can significantly reduce the cost of these fuel cells. It is shown that gold-plated copper substrates coated with silver foam have high activity compared only with gold-plated or only with silver-plated copper catalysts. The currents observed on the proposed catalyst are an order of magnitude higher than the currents on all other electrodes studied. The oxidation of ethanol on it also takes place at more negative potentials. Further stabilization of the silver foam is required due to its tendency to peel off from the substrate in order to successfully use this catalyst in this type of fuel cells.
Modeling and simulation of a 16.20 kWp on-grid solar Photovoltaic System (PV) using PVSyst at Malaysia
Authors: Kadir N A , Abdullah A Z , Mohd Hussin N N
Published: August 2023

Renewable energy is very useful alternative source to replace the usage of conventional energy. Solar energy is one of popular energy that has been utilised as its irradiance can generate electricity when strike with the photovoltaic solar (PV) panels. This paper presents a design and simulation of 16.20 kWp of 405W Si-mono PV system connected to the grid. It is very crucial to do the simulation in order to do the analysis in terms of performance, efficiency, power losses, irradiance and other related factors. The design, operation, and maintenance of new grid-connected solar PV systems may benefit from performance analysis. PVsyst is used as the design and simulation tools for the PV solar system simulation. It was developed by the University of Geneva as a pedagogical tool to explain in detail the procedures and models used, as well as to provide an ergonomic approach to project development. The site involves is Kampung Bukit Tinggi. From the simulation results, the array nominal energy is 25.81 MWh. The output inverter energy available is 21.59 MWh which fed to the grid. The performances ratio is 80.21% due to the several losses. This study may be useful for future grid-connected design and operation.
Comparative study of vibration energy harvesting on home appliances using piezoelectric energy harvester
Authors: Yazib M S A , Saudin N , Mohamed M A , Affendi N A M , Mohamed L , Mohamed H
Published: August 2023

This project was developed to harvest vibration energy using a piezoelectric energy harvester. The availability of home appliance vibration energy is a promising solution to get clean energy resources to manipulate wasted energy. When the appliances’ vibration hits the piezoelectric energy harvester surface, pressure is applied to the piezoelectric transducers and converts mechanical energy into electrical energy. The piezoelectric energy harvester’s efficiency depends on the availability of the home appliances’ vibration energy; thus, using multiple piezoelectric transducers in series generates more power. The piezoelectric’ alternating current (AC) output is fed to a Cockroft-Walton voltage multiplier (CWVM) to convert into direct current (DC) and boost the output. Four piezoelectric transducers connected in series have successfully produced a voltage of up to 4.7 V. Its output voltage can be harnessed to power low-voltage electronic devices.
Performance Evaluation of Bar Load Cell Sensing System for Soil Moisture Measurement
Authors: Saedin Nur Sakinah , Muttalib Muhammad Firdaus Abdul , Jusoh Mohd Fauzie
Published: August 2023

The open-source microcontroller Arduino is simple to program, erase, and reprogram at any moment. It is an open-source computing platform for creating and programming electronic devices based on basic microcontroller boards. In agriculture, soil moisture content must be monitored soil monitoring continuously to understand the relationship between soil moisture content status and plant water use to minimize under and over-irrigation. Current methods have a short lifespan due to possible corrosion on the electrode. In this project, we introduce a new indirect method for monitoring soil moisture, especially for soil in the container or pot, based on a low-cost bar-based load-cell sensor with an acrylic plate. This study’s objectives were to compare the number of bar load cell sensors that affect the soil weight and to formulate a calibration model to predict soil moisture content using soil weight. A model design of 10kg and 5kg bar-based load cell sensors will be used to compare the number of bar load cell sensors affecting the soil weight. The measurement result of each method was very similar and constant for the various positions on the design. There is no significant difference in average soil weight for any technique, and there is no difference in average soil weight for each sample. R2 values and the calibration equation were tabulated in Table 2.
A Quarter-Circled Multi-Resonator for UWB Re-transmission Based Chipless RFID
Authors: Mohamed G. B. W. , Hossain A. K. M. Z. , Aziz M. Z. A. B. A. , Azam S. M. K.
Published: August 2023

This paper introduces the design and analyses of a new planar parallel microstrip quarter-circled multi-resonator (PQMR) for the chipless radio frequency identification (CRFID) that works in ultra-wide band (UWB) frequency region. The proposed PQMR has identifying (IDing) and potential sensing capabilities to work as a tag-sensor. The PQMR works within 3.30 GHz – 6.53 GHz with a high -10dB quality-factor (Q10dB) of 692, a good spatial density of as low as 7.05 mm2/bit, very good spectral density of 7.33 bits/GHz and a coding capacity of 17 bit with one-bit sensing ability. Different combinations of coding bit streams are also extracted to show the identification ability of the proposed design. This will motivate the CRFID designers to design small and high-capacity tag- sensors for UWB applications.
DWT-BSS: Blind Source Separation applied to EEG signals by extracting wavelet transform’s approximation coefficients
Authors: Massar H. , Nsiri B. , Belhoussine Drissi T.
Published: August 2023

The Electroencephalogram (EEG) signal is widely contaminated by a physiological artifact, such as muscle activity, heart rhythm, and eye movement. The researcher has proposed a number of methods to clean the EEG signal. A group of these methods is called Blind Source Separation (BSS). In this paper, we suggest an approach that combines the BSS methods and the Discrete Wavelet Transform (DWT) algorithm, in order to evaluate the BSS methods after applying them to the approximation coefficients extracted using the DWT. The aim of this work is to identify which BSS algorithms, using which family of wavelet and at which decomposition level, would provide excellent performance. We used the Spearman Correlation Coefficient (SCC) to rate our methods. The technique that performs the best, as evaluated by the SCC between the generated component and the approximation coefficient obtained from the Horizontal EOG results, is AMICA, which obtains a value of 0.81 for levels 2 while using the wavelet symlet at scales 7 and 11. With a value of 0.70 and the use of the wavelet Daubechies at scale 9 and Coiflets at scales 2 and 5 for level 1, AMICA also has the best SCC value calculated between the separated component and the approximation coefficient recovered from the Vertical EOG. While employing the wavelet symlets at scales 5, 7, 8, and 11. for level 2, and level 3 when using the wavelet symlets at scales 1 and 2.