bluuebunny/crossref_metadata_2025_split huggingface dataset:
A LTNE approach on the study of transverse hydromagnetic on mixed convection in a channel.
Authors: Kumar Ashok , Saini Akshay , Kumar Ashok , Singh Negi Anup 
Published: December 2024

Abstract
This article reports the investigation of magneto-hydro-dynamic (MHD) fluid flow in a channel occupied within a porous medium. When the temperature of the porous surface and fluid surface are not equal, this is known as LTNE. In this paper, mixed convection in a vertical porous channel along with a transverse hydromagnetic effect is reported. The fluid in the channel is assumed electrically conducting and flow is due to the external pressure gradient and the buoyancy force. To describe the flow in a porous medium non-Darcy-Brinkman-Forchheimer extended (NDBF) model is considered here. The local thermal non-equilibrium (LTNE) model is used and the governing equations are solved numerically using the Chebyshev spectral collocation method (CSCM) and a significant agreement is found with the analytical solution in the special case. Extensive focus is given to the impact of heat transfer coefficient, Hartman number, and Darcy number on the fluid flow mechanism at fixed values of other parameters. The numerical results show that The fluid flow, as well as heat transfer, are reduced on decreasing media permeability via changing Darcy number. Both Nusselt numbers for solid and fluid reduce on reducing Darcy parameter. The velocity is reduced in the middle region of the channel on increasing Hartman number, while it is increasing near the walls. The effect of heat transfer coefficient and Hartman number on temperature is meager.
Triplet Order Adaptive Seventh-Order WENO Scheme for Compressible Flows
Authors: Arun Govind Neelan A , Rathan Samala 
Published: December 2024

Abstract
Accurately determining shock structures is crucial for assessing the loads on supersonic flights. Achieving precision in aero-thermal load estimation for high Mach number flows demands the use of higher-order high-resolution algorithms. This study introduces a specific higher-order high-resolution scheme renowned for its exceptional shock-resolving capabilities. While many seventh-order schemes typically achieve only fourth or seventh-order accuracy, the presented scheme can attain accuracy levels of fourth-, sixth-, or seventh-order. Notably, it precisely satisfies the Taylor series with zero residues, unlike many existing schemes that yield small non-zero residues. This accomplishment is attributed to a novel weighting function that breaks the direct connection between the smoothness indicator and the weighting function. The scheme’s effectiveness is validated using gas dynamics Euler equations, particularly in scenarios involving step-like discontinuities such as shock tube problems and double Mach reflection test cases. Across various test cases, the proposed scheme consistently demonstrates minimal errors and exhibits outstanding shock-resolving properties.
Investigation of the robustness of a novel input preshaping vibration control technique
Authors: Riboli M. , Dall’Olio F. , Manconi E. , Ghazizadeh Ahsaei A. , Silvestri M. 
Published: December 2024

Abstract
This work presents a study on the robustness of a novel preshaping command input method for vibration control of moving flexible structures. The methodology is based on a time-parameterised B-spline approach, with control points determined by solving a linearly constrained quadratic optimisation. The objective function minimises the vibrational energy, while the constraints set the kinematic limits of the motion control. Two case studies are considered to investigate the robustness and performance of the proposed method with respect to modelling errors: a triple pendulum on a cart and a rotating Euler-Bernoulli beam. The models are implemented in a Modelica language to simulate the virtual system response under varying operating conditions.
Dispersion Characteristics of Flexural Waves in Vacuo and Submerged Fluid-filled Pipes
Authors: Roslan Mohd , Nalisa Adila , Muggleton  , Jennifer M , Ferguson  , Neil  
Published: December 2024

Abstract
Pipelines are widely recognised as the most efficient and sustainable infrastructure for water transportation in the water management and distribution industries, but their efficiency is often compromised by leaks. In this paper, the low-frequency flexural behaviour is investigated to estimate the dispersion characteristic of free flexural wave propagation in MDPE water pipes. It is investigated under two conditions: an empty and fluid-filled pipe either surrounded by air or by water. An Euler Bernoulli prediction model was developed for these pipe scenarios, and validation experiments were conducted on a 1.8-metre-long pipe. Results showed that the flexural wavenumber is lower in an empty pipe compared to a water filled pipe. This is because the water adds mass, which reduces the wave speed. The behaviour of the flexural waves is also affected by the fluid outside the pipe, where the external fluid adds mass to the pipe wall, causing the wavespeed to decrease. Experimental results are in good agreement with an analytical model at low frequencies but not at higher frequencies, since higher-order bending waves are present in the experiment results.
Prediction of ground vibrations from rail tunnels –finite-element, boundary-element and wavenumber calculations
Authors: Auersch L 
Published: December 2024

Abstract
The prediction of ground and building vibrations has been established for surface lines and has now been extended to tunnel lines. The wave propagation in homogeneous or layered soils (the transmission) is calculated by an integration in wavenumber domain. The wave amplitudes at different distances and for different frequencies will be analysed for the following situations. 1. The horizontal propagation from a surface point to a surface point constitutes the basic rules. 2. The horizontal propagation from a source point at depth to a receiver point at depth which is related to a building with a deep basement or on a pile foundation. 3. The propagation from depth to the surface, which is the normal case for free-field measurements, has some different characteristics, for example a weaker attenuation with the horizontal distance from the source, which can be approximated by the full-space solution and the reflection rules for incident waves. The emission from a tunnel structure has been calculated by a finite-element model of the tunnel combined with a boundary-element model of the soil giving the reduction compared to a point-load excitation. The immission has been analysed by finite-element models of tunnel-soil-building systems for examples of research and consultancy work. Measurement results from a high-speed and a metro line confirm some of the established rules.
Uncertainty quantification for damage detection in 3D printed auxetic structures based on ultrasonic guided-wave using Flipout probabilistic convolutional neural network
Authors: Lu Houyu , Farrokhabadi Amin , Rauf Ali , Talemi Reza , Gryllias Konstantinos , Chronopoulos Dimitrios 
Published: December 2024

Abstract
The auxetic structure is widely used in aviation, bio-engineering, automation, and other industries due to its outstanding properties, such as being lightweight, high strength-to-weight ratio, and absorbing energy. Neural network methods have been popularly used for auxetic structures’ structural health monitoring. However, the performance of neural network methods in unknown areas is limited. To increase the reliability of the network model, more comprehensive uncertainty quantification is needed for damage detection in unknown areas. This paper introduces a comprehensive framework for health diagnosis and uncertainty quantification in 3D-printed auxetic structures made of polylactic acid. The framework involves quasi-static uniaxial compression and ultrasonic tests conducted simultaneously to capture ultrasonic signals at different deformation states. Critical damage deformation is identified based on observed deformation patterns and variations in signal energy. Using the Hilbert transform, two damage-sensitive features—envelope and phase—are extracted. These features serve as input data for the Flipout probabilistic convolutional neural network (FPCNN) model, which integrates pseudo-independent weight perturbations and a Gaussian probabilistic layer within the visual geometry group 13 architecture to predict structural deformations and associated uncertainties. The uncertainty quantification framework, based on variational inference and the conditional covariance law, effectively separates and quantifies the predictive variance of the network model into aleatoric and epistemic uncertainty. This framework’s feasibility is demonstrated through compression and ultrasonic tests, utilizing the FPCNN. This showcases the uncertainty quantification capabilities of the FPCNN model.
Response probability density of a single-degree-of-freedom linear system under non-Gaussian random excitation with dominant frequency
Authors: Tsuchida Takahiro 
Published: December 2024

Abstract
The response probability density function (PDF) of a single-degree-of-freedom linear system under non-Gaussian random excitation with a non-zero dominant frequency is investigated. The non-Gaussian excitation is a zero-mean stationary stochastic process prescribed by a first-order PDF and a power spectral density (PSD) with bandwidth and dominant frequency parameters. Uniform and Laplace distributions are considered for the excitation PDF. Monte Carlo simulations are performed to obtain the stationary displacement and velocity PDFs of the system. The simulation results indicate that the effects of excitation non-Gaussianity on the response PDFs vary greatly, depending on the bandwidth and dominant frequency of the excitation PSD. Particularly, the excitation non-Gaussianity appears strongly in the response PDFs when the excitation has a narrow bandwidth and the excitation dominant frequency matches the natural frequency of the system. Next, it is shown that when the excitation and response waveforms are similar, the response PDFs take a shape similar to the excitation PDF; on the other hand, when the waveforms are different, the response PDFs are nearly Gaussian, irrespective of the shape of the excitation PDF. Furthermore, as a quantitative index of waveform similarity, the maximum absolute value of the normalized cross-correlation function of excitation and response is introduced. The correspondence between the index value and the non-Gaussianity of the response PDF is revealed.
Design of Sonic Cage to attenuate noise in Mines using Sonic Crystal and Melamine Foam
Authors: Swain Manish Kumar , Naik H.K. , Jena D.P. 
Published: December 2024

Abstract
Sonic crystals (SCs) are structures made of sound scatterers periodically arranged in a square or triangular lattice. Recent research on sonic crystals has demonstrated that they are efficient materials for controlling the propagation of sound. They attenuate sound in certain frequency bands due to Bragg scattering across the periodic scatterers. This range of frequencies is known as the bandgap, and it is found that sound propagation is significantly reduced in this bandgap region. Belt conveyors linked sequentially to create extensive pathways across surface mines contribute significantly to noise pollution. Typically, noise emission regulations are surpassed in areas where these conveyors operate, especially at night. The operation of belt conveyors predominantly contributes to the overall noise produced by the technological infrastructure. Hence, it is crucial to aim at decreasing their noise emissions. So, with an aim to attain elevated noise reduction, various intuitive sonic cage designs made of sonic crystals such as rigid scatterers, resonant scatterers, and multi resonant scatterers were suggested and followed by the calculation of free-field insertion loss (IL). Insertion Loss (IL) refers to the decrease in noise level at a specific location resulting from the installation of a noise control device along the sound path between the sound source and that particular location. The novelty of this work is that a class of periodic structures, called the radial sonic crystals are presented, in polar coordinates. The initial investigation shows the insertion loss of the proposed sonic cage followed by calculation of insertion loss of hybrid sonic cage design using melamine foam.
Recent Advances and Prospect of Coating-based Microwave Absorber
Authors: Hussin R , Mahmud M N , Ain M F , Ariff Z M , Yahaya N Z 
Published: December 2024

Abstract
The development of microwave absorbers (MAs) involves using electromagnetic (EM) absorbing materials primarily composed of matrix and filler materials designed as composites that enhance EM absorption. Key requirements for MAs include thinness, light weight, broad bandwidth, high absorption, stable thermal response, and strong mechanical properties. However, conventional composite-based MAs tend to be thick, heavy, narrow-band, less absorbent, less stable thermally and weak mechanically. This review highlights the potential of coating-based MAs in solving these problems using coating techniques, including thermal spray coating, liquid processing coating, and vapor deposition coating. The goal is to meet the key requirements while addressing limitations such as slow processing, material waste, and high-temperature resistance.
Nutrient leaching analysis in cover crop management to enhance the nutrient cycling process in coconut plantations
Authors: Tenjaya M C , Suwardi  , Oktariani P , Sumawinata B , Fawzi N I , Randrikasari O 
Published: December 2024

Abstract
This study investigates the dynamics of nutrient cycling within closed-system peatland ecosystems, focusing on the role of nutrient leaching in enhancing biomass productivity. Conducted in a coconut plantation in Pulau Burung District, Indragiri Hilir Regency, Riau Province, the research quantitatively assesses the leaching of essential nutrients into a 10 cm layer of peat soil resulting from cover crop decomposition. These cover crops, integral to the plantation’s organic coconut production strategy, are managed through periodic cutting (every four months) and natural decomposition on the field. To closely replicate field conditions, the study employed a lysimeter method to measure the nutrients leached into the leachate. Over an observation period of eight weeks, nutrient leaching was systematically measured to determine the availability of nutrients to plants. Key findings include significant leaching rates of potassium (K) at 90.9 kg/ha/year, calcium (Ca) at 9.4 kg/ha/year, and iron (Fe) at 1109.9 g/ha/year through the peat layer. In contrast, the leaching of magnesium (Mg), copper (Cu), zinc (Zn), and manganese (Mn) was negligible, suggesting low concentrations in the cover crops and potential chelation, which impedes their mobility. This research highlights the critical role of cover crop management in promoting nutrient cycling, which is essential for sustaining the productivity and environmental health of peatland agricultural systems. The findings advocate for the integration of such practices into peatland management strategies to improve overall ecosystem sustainability.
Pellets From Three Types of Wood As Alternative Energy
Authors: Nuwa  , Damanik Maya Monika 
Published: December 2024

Abstract
The study’s primary goal is to assess the biopellet quality derived from waste Ulin (Eusideroxylon zwageri), Meranti Putih (Shorea bracteolata Deyr), and Rengas (Gluta spp.) using SNI 8021: 2014. The second is to compare the three varieties of Ulin wood—Meranti Putih, Rengas, and Ulin wood—in terms of quality. This study’s analysis employed a completely randomized design (CRD), with Ulin, Meranti Putih, and Rengas as the three wood species treatments, and three replications of each treatment. With the exception of density value, the quality of Ulin, Meranti Putih, and Rengas wood pellets was found to meet SNI 8021-2014 criteria. Ulin wood pellets’ density value only satisfies SNI 8021-2014 requirements. The treatment of several wood species utilized as raw materials for wood pellet production did not result in appreciable differences in the values of bound carbon content, moisture content, ash content, volatile matter content, or compressive strength. However, the calorific value that results from the density value is very important. When used to make wood pellets, Ulin sawdust is of higher quality than Meranti Putih and Rengas.
Human Health Risk Assessment of Mercury in Fish Samples: Lessons Learned from the Indonesia Peatland River
Authors: Maulia R , Ardiyani V , Widiastuti Erma Nurjanah 
Published: December 2024

Abstract
This study investigates mercury concentrations in fish samples purchased from a traditional market in Palangka Raya City, Indonesia. Mercury was quantified using the AAS technique, which had detection limits of less than 0.00004 mg/kg. The method’s accuracy was tested against a certified reference material of fish protein from the 2016 Indonesian National Standard no.2354.6 (SNI). The species under examination inhabited rivers in the peatland basin (e.i. wild-pangasfish - Pangasius pangasius, hemibragus - Bagrus nemurus, kriptoterus - Cryptopterus palembangensis, mad barb - Leptobarbus hoevenii, flatfish - Chitala lopis, rasbora - Rasbora argyrotaenia, anglefish - Pangasius microneme, wallago - Wallago leeri, prawn - Penaeus monodon); pond fish (e.i. nilefish - Nile tilapia, goldfish - Cyprinus carpio, pangasfish - Pangasius pangasius); sea (e.i. macarel scad - Decapterus, short macarel - Rastrelliger kanagurta, Spanish macarel - Acanthocybium solandri, pomfret - Parastromateus niger; squid - Loligo chinensis; sea - shrimp); swamp (snakehead – Canna marulius, catfish – Clarias batrachus, kissing gourami – Helastoma temminckii). The mercury concentrations, measured in wet sample weight, ranged from 8 to 3500 grams. The Target Hazard Quotient (THQ), Maximum Safe Consumption Amount (MSCQ), and Estimated Weekly Intake (EWI) were used to look at the health risk assessment analysis. The results were carefully looked over and discussed. We’ve concluded that eating 50 g of these fish types every day is harmful to people’s health in the study area.
The Triple Layer Business Model Canvas Application in Sustainable Waste Management: A Case Study in Telaga Ngebel, Ponorogo, Indonesia
Authors: Widya A N , Gravitiani E , Sassanti I A 
Published: December 2024

Abstract
The issue of waste in the Telaga Ngebel tourism area remains a complex problem. A waste bank, as a sustainable waste management solution, has the potential to create economic value. This sustainable waste management can be formulated through a business model called the Triple Layer Business Model Canvas (TLBMC). This research aims to identify waste management through a waste bank and describe the business model using the TLBMC concept. The method used is qualitative with a case study approach. The primary data used was obtained through in-depth interviews and analyzed using the TLBMC. The results show that the waste bank program is suitable to be implemented in the Telaga Ngebel water tourism area. A comprehensive framework regarding the activities, resources, and relevant stakeholders needed to run the waste bank program in Telaga Ngebel, Ponorogo, has been obtained.
Community Forestry as Livelihood Assets: Household Perspectives and Sustainable Practices
Authors: Makkarennu  , Irnasari  , Muhammad Alif K. S 
Published: December 2024

Abstract
Community forestry (CF) has provided significant benefits to communities and maintained forest sustainability. This study aims to analyze the level of community dependence on the Community Forestry area and identify livelihood assets based on five capitals: human capital, natural capital, financial capital, physical capital, and social capital, as well as sustainable livelihood strategies. This study uses the method of analyzing the level of dependency using the contribution formula and livelihood analysis. The results showed that the level of community dependence on the CF permit area in a year was 36%, while from outside CF management, it was 64%. This shows that the community manages more commodities from outside the CF area than within the CF area because the market price demand for products from outside the CF area, such as corn and rice, is more stable and higher, which affects their income. In addition, many commodities that have just begun to be developed by the community have not yet provided significant economic benefits. The most influential capital in encouraging people to obtain a decent livelihood is physical capital, which is supported by several categories such as housing conditions, means of transport, access to communication tools, road access, and public assets. Meanwhile, human capital, natural capital, social capital, and financial capital are in the medium category. These four capitals synergize with each other through community skills supported by good cooperation among farmer groups, as well as the availability of natural resources that can be managed to fulfill daily needs. Sustainable livelihood strategies adopted by the community include intensification and extension, diversification, and migration. This research provides an in-depth understanding of the dynamics of community dependence on community forestry and the various livelihood strategies they use to achieve economic and environmental sustainability.
Daily variation of total suspended solid, total nitrogen, and total phosphorus at Cisangkuy River Basin, the Upper Citarum sub-Basin
Authors: Aisyah S , Subehi L , Apip  , Verawati D 
Published: December 2024

Abstract
The Cisangkuy basin is part of the upstream Citarum sub-basin, which flows through the Bandung regency’s. total suspended solid (TSS), nitrogen (N), and phosphorus (P) in the Cisangkuy River are potentially polluted due to human activities like agriculture. This study aims to reveal the daily trend of total suspended solids (TSS), total nitrogen (TN), and total phosphorus (TP) at the Cisangkuy River, the upper Citarum in the period of March-May 2023. The study was conducted from March to May 2023 in the Cisangkuy sub-basin. The measured water quality parameters included total suspended solids, nitrogen, and phosphorus. Data were analyzed visually and statistically using MS Excel 2013. From the results of observations at rainfall observation stations, the intensity of rain at the study location tends to be low to moderate (0.5- 50 mm), with the highest intensity occurring in early May. Generally, this pattern is followed by the values from observations of water level TSS concentration at Lamajang and Kamasan tended to follow the rainfall pattern with concentration values that exceeded standard water quality criteria for river. TP concentrations followed the TSS pattern relatively with concentrations exceeding standard water quality criteria during some of the study period. TN concentrations at both study locations showed high value and still met the standard criteria. Water pollution control should be prioritized based on crucial characteristics that contribute significantly to pollution in the Cisangkuy basin.