bluuebunny/crossref_metadata_2025_split huggingface dataset:
Linear and nonlinear Granger causality analysis of turbulent duct flows
Authors: Lopez-Doriga B , Atzori M , Vinuesa R , Bae H J , Srivastava A , Dawson S T M 
Published: May 2024

Abstract
This research focuses on the identification and causality analysis of coherent structures that arise in turbulent flows in square and rectangular ducts. Coherent structures are first identified from direct numerical simulation data via proper orthogonal decomposition (POD), both by using all velocity components, and after separating the streamwise and secondary components of the flow. The causal relations between the mode coefficients are analysed using pairwise-conditional Granger causality analysis. We also formulate a nonlinear Granger causality analysis that can account for nonlinear interactions between modes. Focusing on streamwise-constant structures within a duct of short streamwise extent, we show that the causal relationships are highly sensitive to whether the mode coefficients or their squared values are considered, whether nonlinear effects are explicitly accounted for, and whether streamwise and secondary flow structures are separated prior to causality analyses. We leverage these sensitivities to determine that linear mechanisms underpin causal relationships between modes that share the same symmetry or anti-symmetry properties about the corner bisector, while nonlinear effects govern the causal interactions between symmetric and antisymmetric modes. In all cases, we find that the secondary flow fluctuations (manifesting as streamwise vorticial structures) are the primary cause of both the presence and movement of near-wall streaks towards and away from the duct corners.
Karhunen–Loéve decomposition of high Reynolds number turbulent pipe flows: a Voronoi analysis
Authors: Massaro D. , Yao J. , Rezaeiravesh S. , Hussain F. , Schlatter P. 
Published: May 2024

Abstract
We perform the Karhunen–Loéve decomposition of the data from direct numerical simulations pertaining to incompressible turbulent pipe flow at various Reynolds numbers, in order to identify large-scale coherent structures. A novel approach based on the Voronoi diagram is introduced to estimate the energy distribution along the radial direction as a function of the geometrical properties of the modes. In contrast to previous classifications, no user-defined criterion, threshold or ad-hoc separation of the eddies is required since the two most energetic branches are inherently present as the Reynolds number increases. Details about the Voronoi analysis are provided, together with a comprehensive validation and comparison with previous classifications at low Reynolds numbers. We discuss the results and potential of the presented approach at Reτ
= 180 and 5200, commenting on the two classes of coherent structures with a varying and constant size in the radial direction appearing at Reτ
= 5200.
Accelerating high order discontinuous Galerkin solvers using neural networks: Wall bounded flows
Authors: Mariño Oscar A. , Mayoral David , Juanicotena Adrián , De Lara Fernando Manrique , Ferrer Esteban 
Published: May 2024

Abstract
High order solvers are accurate but computationally expensive as they require small time steps to advance the solution in time. In this work we include a corrective forcing to a low order solution to improve the accuracy while advancing in time with larger time steps, and achieve fast computations. The work uses a discontinuous Galerkin framework, where the polynomial order, inside each mesh element, can be varied to provide low or high accuracy. The corrective forcing is included for each high order Gauss nodal point in the mesh. This work is a continuation of [1, 2], where we extend the methodology to wall bounded flows. Namely, we adapt the methodology to a turbulent channel at Reτ
= 182. In this case, we use three neural networks to correct different regions of the flow, which are distinguished by their y+ distance to the wall. The methodology is able to correct the low resolution simulation to attain flow statistics that are comparable to high order simulations. We include comparisons for the mean, Reynolds stresses and shear stress on the wall. We achieve good predictions using the corrected low order solution, in mean velocity and its corresponded fluctuations, as well as the shear stress on the wall.
Relating absorbing and hard wall boundary conditions for a one-dimensional run-and-tumble particle
Authors: Guéneau Mathis , Touzo Léo 
Published: May 2024

Abstract
The connection between absorbing boundary conditions and hard walls is well established in the mathematical literature for a variety of stochastic models, including for instance the Brownian motion. In this paper we explore this duality for a different type of process which is of particular interest in physics and biology, namely the run-tumble-particle, a toy model of active particle. For a one-dimensional run-and-tumble particle (RTP) subjected to an arbitrary external force, we provide a duality relation between the exit probability, i.e. the probability that the particle exits an interval from a given boundary before a certain time t, and the cumulative distribution of its position in the presence of hard walls at the same time t. We show this relation for a RTP in the stationary state by explicitly computing both quantities. At finite time, we provide a derivation using the Fokker–Planck equation. All the results are confirmed by numerical simulations.
Quantum field theory at finite temperature for 3D periodic backgrounds
Authors: Santamaría-Sanz Lucía 
Published: May 2024

Abstract
The one-loop quantum corrections to the internal energy of some lattices due to the quantum fluctuations of the scalar field of phonons are studied. The band spectrum of the lattice is characterised in terms of the scattering data, allowing to compute the quantum vacuum interaction energy between nodes at zero temperature, as well as the total Helmholtz free energy, the entropy, and the Casimir pressure between nodes at finite non-zero temperature. Some examples of periodic potentials built from the repetition in one of the three spatial dimensions of the same punctual or compact supported potential are addressed: a stack of parallel plates constructed by positioning

δ

δ

′

-functions at the lattice nodes, and an ‘upside-down tiled roof’ of parallel two-dimensional Pöschl–Teller wells centred at the nodes. They will be called generalised Dirac comb and Pöschl–Teller comb, respectively. Positive one-loop quantum corrections to the entropy appear for both combs at non-zero temperatures. Moreover, the Casimir force between the lattice nodes is always repulsive for both chains when non-trivial temperatures are considered, implying that the primitive cell increases its size due to the quantum interaction of the phonon field.
A unifying representation of path integrals for fractional Brownian motions
Authors: Bénichou Olivier , Oshanin Gleb 
Published: May 2024

Abstract
Fractional Brownian motion (fBm) is an experimentally-relevant, non-Markovian Gaussian stochastic process with long-ranged correlations between the increments, parametrised by the so-called Hurst exponent H; depending on its value the process can be sub-diffusive

(
0
<
H
<
1

/

2
)

, diffusive

(
H
=
1

/

2
)

or super-diffusive

(
1

/

2
<
H
<
1
)

. There exist three alternative equally often used definitions of fBm—due to Lévy and due to Mandelbrot and van Ness (MvN), which differ by the interval on which the time variable is formally defined. Respectively, the covariance functions of these fBms have different functional forms. Moreover, the MvN fBms have stationary increments, while for the Lévy fBm this is not the case. One may therefore be tempted to conclude that these are, in fact, different processes which only accidentally bear the same name. Recently determined explicit path integral representations also appear to have very different functional forms, which only reinforces the latter conclusion. Here we develop a unifying equivalent path integral representation of all three fBms in terms of Riemann–Liouville fractional integrals, which links the fBms and proves that they indeed belong to the same family. We show that the action in such a representation involves the fractional integral of the same form and order (dependent on whether

H
<
1

/

2

or

H
>
1

/

2

) for all three cases, and differs only by the integration limits.
Effect of pruning intensity and picking on Acacia senegal for gum arabic yield in Northern Jigawa State, Nigeria
Authors: Abdu A , Alias M A , Abdul-Hamid H 
Published: May 2024

Abstract
Climate significantly impacts dryland trees, influencing their adaptation, survival, production, and role in the ecosystem. Acacia senegal is a valuable dryland tree planted for gum arabic production and ecological benefits. However, gum arabic production has declined due to the adverse effects of climate and improper management. Thus, silvicultural intervention such as pruning is essential for the health, growth, and gum yield of A. senegal. This study investigates the effects of different pruning intensities and pickings on gum arabic yield at Madana and Garin-ladan in the Gumel district of northern Jigawa State, Nigeria. The experiment involved five levels of pruning intensity and eight pickings, conducted using a randomized complete block design with three replicates. The gum yield was collected, dried, and weighed, and ANOVA was performed using Statistix 10.0 software, with Shapiro-Wilk and Turkey tests for data normality and mean comparison. The result showed significant differences (p < 0.05) in gum yield among the pruning intensities for most of the pickings at the two sites. The 1st, 2nd, 3rd, 5th, 6th, and 3rd, 5th, 8th pickings are significantly different except 4th, 7th, 8th; and 1st, 2nd, 3rd, 6th, and 7th at Madana and Garin-ladan respectively. The highest gum yield is 52.5a, 46.7a, 50.1a, and 43.5a g/picking, respectively. The lowest is 0.8a and 0.9a g/picking, respectively. Pruning intensity significantly differs (p< 0.05) in total gum yield per tree. Pruning intensities B3 and B4 demonstrated the highest total gum yield (251.8a and 147.6a g/tree) at both sites, respectively. At the same time, B0 exhibited the lowest gum arabic yield (97.2c and 38.5b g/tree) at both locations. These findings prove that pruning intensities B3 and B4 are the most effective in promoting gum yield and may enhance the gum productivity of A. senegal trees in northern Jigawa State.
Analysis of Mini Polder Performance for Improved Water Management in the Dadahup Swampy Irrigation Area
Authors: Handoko Dede , Istiarto  , Karlina  
Published: May 2024

Abstract
The Indonesian government has chosen the Dadahup Swampy Irrigation Area as one of its Food Estate regions to address food security concerns. Following the rehabilitation of the irrigation network and the construction of gates from 2020 to 2022, block A5 is chosen as a pilot project using a mini polder as its water system management. In the right block A5, mini polders small-scale embankments are designed to regulate water flow and optimize land utilization. This research comprehensively evaluates the mini polder’s effectiveness in right block A5 in improving water control within the swampy landscape, considering the influence of rainfall patterns. Our study aims to comprehensively evaluate how mini polders effectively improve water control in the Dadahup Swamp Irrigation Area. To achieve this, we consider the influence of rainfall patterns, which play a significant role in the region’s hydrological dynamics. In addition to traditional data analysis, we integrate hydraulic simulations into our study using HEC-RAS software. These simulations allow us to model and visualize how mini polders interact with the complex water flow patterns in the Dadahup Swampy Irrigation Area. By combining empirical data with hydraulic simulations, we can better understand how mini-polders function in response to varying rainfall scenarios. Based on the simulation results, it was found that without the polder system, the water level would be on dry land during the dry season. The simulation provides direction or guidelines for polder operations to maintain the water level as long as possible during the dry season and prevent flooding during the rainy season. This research can provide valuable insights into sustainable agriculture practices in this unique and challenging environment.
Diversification of rendang daun kayu: Strengthening the food security of the Minangkabau community
Authors: Rusdi  , Saputra B , Wirdanengsih  , Erianjoni  , Hardi E , Firza  
Published: May 2024

Abstract
Rendang is one of the traditional Minangkabau culinary preparations of West Sumatra, Indonesia, that has gone global. Rendang sometimes uses meat, but some use plants as the main ingredient. Weak economic conditions and the high price of meat in the market do not become an excuse for Minangkabau people not to eat rendang because rendang culinary can be processed with vegetable-based ingredients. In Nagari Harau, Lima Puluh Kota Regency, West Sumatra, wood leaves from wild plants can be processed into a very delicious rendang culinary. They call it “rendang daun kayu.” Diversification of rendang daun kayu can be an exciting effort to improve the food security of the Minangkabau people. Thus, this article will discuss efforts to diversify rendang daun kayu as a strategy to strengthen the food security of the Minangkabau community. The qualitative descriptive method was used in this research. Primary data, secondary data, interview guidelines, and in-depth interview activities supported data collection. Informants were selected using snowball sampling. Source triangulation analysis was used to answer the research objectives. Based on the research results, it is known that the diversification of rendang daun kayu is the development of rendang culinary dishes using locally available wood leaf raw materials. Diversification of rendang daun kayu is an innovative step towards more robust food security for the Minangkabau people. Diversifying rendang daun kayu is expected to create food security for the Minangkabau community.
Advantages of early-maturity soybean varieties as a farmer adaptation effort to climate change in Grobogan Regency
Authors: Chanifah  , Sahara D , Susila A , Triastono J 
Published: May 2024

Abstract
The climate change impact is cropping patterns change, including unpredictable droughts and floods. These conditions require soybean farmers to adapt, one of them is adopting early maturing soybean varieties. This research aims to identify the advantages of early-maturity soybean varieties, financial feasibility, and technical Efficiency. This study collected data from 40 soybean farmers in the Grobogan Regency. Soybean farming data used in planting season III (May-August) 2021. Biosoy varieties are early maturing, compared to the Anjasmoro varieties as existing soybeans. The financial feasibility of early-maturing soybeans is analyzed by the Marginal Benefit Cost Ratio (MBCR), while technical Efficiency is by stochastic frontier. The research showed that a) advantages of Biosoy early-maturing soybeans include higher production, larger seeds, and reduced risk of crop failure due to drought; b) Biosoy varieties are feasible to develop with an MBCR level of 3.19, and c) an average technical efficiency is 0.92. Biosoy varieties demonstrated better advantages than Anjasmoro varieties. The government, as a policy maker, is expected to be able to encourage farmers to adopt Biosoy varieties and optimize production inputs to make them more efficient so that farmers can adapt to climate change adaption.
Enhancing household rice farmers’ welfare under climate change conditions using loop diagrams of causality: A system thinking approach
Authors: Mutisari Rini , Syafrial  , Hanani Nuhfil , Sujarwo  
Published: May 2024

Abstract
Climate change has hurt several sectors, but agriculture has been a tough hit. Small farmers are the people most affected by climate change because they have less access to resources and information. Their household welfare is lowered as a result, and they are unable to avoid the effects of climate change. To lessen the negative effects of climate change, farmers have to figure out how to adapt to it. This study uses a household economic model to examine the relationship between livelihood assets and strategic adaptation using the framework of systems thinking. This research has created causal loop diagrams (CLDs) based on a literature review to capture crucial variables in farmer households’ economic behavior under climate change conditions. By using these CLDs, more studies can be conducted to enhance the welfare of rice farmers through multiple policy simulations.
The Role of Root and Tuber Crops on Food Diversification Facing the Climate Change in East Java Indonesia
Authors: Suhartini  , Waluyo Budi , Irawanto Dodi Wirawan , Nofal Bahieddin , Lasitya Daffa Sandi , Jihad Baroroh Nur 
Published: May 2024

Abstract
Root and tuber crops consisting of cassava, sweet potato, potato, taro and others root and tubers have the important roles as the source of food, nutrition and cash income for many farmers in Indonesia. These crops also as a source of carbohydrates beside rice, corn, cereals, wheat etc. Root and tuber crops are the second most important group of crop plants after the cereals. The government of Indonesia accelerate food diversification based on local food resources, especially facing the climate change. The objective of this study was to estimate the role of root and tuber crops on food diversification and to estimate the household root and tuber crops demand in East Java Indonesia. The research used SUSENAS (Indonesian National Socio-Economic Survey) 2020 data with 31.990 household respondents in East Java Indonesia. Demand for food was estimated by AIDS (Almost Ideal Demand System) model. The results show that the average consumption for root and tuber crops was 0,69 kg/household/week (11,23% from carbohydrates foods), whereas rice consumption amount 4,86 kg/household/week (79,68 %), maize amount 0,25 kg/household/week (4,13%) and cereals amount 0,3 kg/household/week (4,96%). The expenditure elasticity of root and tuber crops was 1,36, while the expenditure elasticity of rice amount 0,78 (normal food), maize (1,41) and cereals (1,27). The expenditure elasticity more than 1 means that root and tuber crops as a superior food, also for maize and cereals. People no longer considers that root and tuber crops to be an inferior food. The root and tuber crops consumptions have the highest proportion after rice. It can be mean that root and tuber crops have the important role on food diversification in East Java Indonesia. Facing the climate change, root and tuber crops development be a right decision, moreover, root and tuber crops can be planted on dry land which is still widely available in Indonesia.
Strategy to Reduce the Impact of Food Waste Through Environmentally Friendly Household Waste Management in Bojonegoro Regency
Authors: Pariasa I I , Amalia R , Siswantoro A , Putra A N 
Published: May 2024

Abstract
Food waste is a description of people’s behavior regarding consumption patterns that are not in accordance with daily needs. The negative impacts caused by food waste behavior have become a world issue, including: food crisis, water and land pollution, and global warming. Global warming occurs partly due to food waste which accumulates in large quantities which produces methane gas, thus forming greenhouse gases. This greenhouse gas then triggers global warming. Therefore, this research aims to identify the types of waste produced by households and analyze strategies for reducing negative impacts due to food waste behavior in Bojonegoro Regency, East Java, Indonesia. The research location includes 4 villages in Bojonegoro included Sembung, Bangilan, Pilang Gede, and Kenep. The method approach used is quantitative. The conclusion of the results of this research shows that organic and inorganic waste in the villages of Bangilan, Sembung, Kenep and Pilang Gede is dominated by purchasing processed food activities, Purchasing children’s equipment and Purchasing clothes/fashion. The implementations of waste management are a good strategy for sustainable environmental conditions in the four villages such as rethink, refuse, reduce, reuse, rot and recycle strategies, however, in overcoming environmental problems, consistency and mutual support between parties is needed.
Drought tolerance testing of paddy variety Inpari 4 with PEG-6000 in the germination phase
Authors: Hartyanto A A S P , Triharyanto E , Pujiasmanto B 
Published: May 2024

Abstract
Paddy (Oryza sativa L.) factors in the importance of life for Indonesians. The challenge that will be faced in the future is global warming which can cause drought in the agricultural sector. Paddy is very susceptible to drought during germination and early growth stages. Such drought can cause crop production to decline. This research aims to provide earlier information on drought-tolerant paddy varieties. The research carried out in the Laboratory of Ecology and Plant Production Management, Sebelas Maret University. It was applied FCRD consisting of the first factor of PEG-6000 concentration (C) which is 0% (C0), 10% (C1), 15% (C2), 20% (C3) and 25% (C4), the second factor of soaking duration (S) is 12 hours (S1), 24 hours (S2) and 36 hours (S3). The data obtained were analyzed using ANOVA and further tested with DMRT 5%. The results of research on seed viability from the application PEG-6000 which can have a drought effect show that at a temperature of 26°C produces germination of 84,30%, C3S3 gave the highest value on germination (90,50%) and growing speed (47,58%/etmal), C0 gives the highest value at lead length (29,05 cm) and C4 gives the highest value at radicle length (35,64 cm).
Analysis of carbamate and organophosphorus pesticide in agricultural irrigation water by Liquid Chromatography - Mass Spectrometry
Authors: Manh Nguyen Khac , Nguyet Trinh Thi Anh , Hanh Dam Thi Bich , Nhan Ngu Truong , Viet Tran Tuan 
Published: May 2024

Abstract
So far, the ultra-trace concentration of pesticide residues in environmental samples has challenged many analytical techniques, which are used to detect simultaneously organophosphorus and carbamate with various polarities. In this study, the OASIS-HLB column was modified by the reagent 1,8-Dihydroxy-2-(4-sulfophenylazo)naphthalene-3,6-disulfonic to enhance the retention of polar pesticides. Both real irrigation water and distilled water samples were applied to validate the determination method of ten carbamates and thirty-eight organophosphorus pesticides all together using LC-MS. According to the results, the linear interval of the method ranged from 1.0 to 100 µg/L, the detection limit was as low as 5.0 µg/L, the relative standard deviations presented less than 8.0%, and the recoveries were ranging between 60% and 112%. Moreover, in the irrigation water samples which were collected in both dry and rainy seasons in ten stations around the agricultural area, five compounds were found, including fenamiphos, terbufos, aldicarb, propoxur, and methiocarb. In the midst of those sampling areas, the Environmental Impact Quotient Field Use Rating of detected pesticide residues presented a high value - 272 at one station, which indicates a high risk for the surrounding environment as well as the local people’s health.