bluuebunny/crossref_metadata_2025_split huggingface dataset:
(Re)mind the gap: A hiatus in star formation history unveiled by APOGEE DR17
Authors: Spitoni E. , Matteucci F. , Gratton R. , Ratcliffe B. , Minchev I. , Cescutti G. 
Published: August 2024

Context. Analysis of several spectroscopic surveys indicates the presence of a bimodality between the disc stars in the abundance ratio space of [α/Fe] versus [Fe/H]. The two stellar groups are commonly referred to as the high-α and low-α sequences. Some models capable of reproducing such a bimodality invoke the presence of a hiatus in the star formation history in our Galaxy, whereas other models explain the two sequences by means of stellar migration.
Aims. Our aim is to show that the existence of the gap in the star formation rate between high-α and low-α is evident in the stars of APOGEE DR17, if one plots [Fe/α] versus [α/H], confirming previous suggestions. We then try to interpret the data by means of detailed chemical models.
Methods. We compare the APOGEE DR17 red giant stars with the predictions of a detailed chemical evolution model based on the two-infall paradigm, taking into account also the possible accretion of dwarf satellites.
Results. The APOGEE DR17 abundance ratios [Fe/α] versus [α/H] exhibit a sharp increase in [Fe/α] at a nearly constant [α/H] (where α elements considered are Mg, Si, O) during the transition between the two disc phases. This observation strongly supports the hypothesis that a hiatus in star formation occurred during this evolutionary phase. Notably, the most pronounced growth in the [Fe/α] versus [α/H] relation is observed for oxygen, as this element is exclusively synthesised in core-collapse supernovae. The revised version of the two-infall chemical evolution model proposed in this study reproduces the APOGEE DR17 abundance ratios better than before. Particularly noteworthy is the model’s ability to predict the hiatus in the star formation between the two infalls of gas, which form the thick and thin disc, respectively, and thus generate abundance ratios compatible with APOGEE DR17 data.
Conclusions. We show that the signature of a hiatus in the star formation is imprinted in the APOGEE DR17 abundance ratios. A chemical model predicting a pause in the star formation of a duration of roughly 3.5 Gyr, and in which the high-α disc starts forming from pre-enriched gas by a previous encounter with a dwarf galaxy, could well explain the observations
Homeopathy in Lymphatic Filariasis: A Narrative Review
Authors: Prusty Akhyaya Kumar , Nayak Chaturbhuja , Prusty Umakanta , Bhandari Preeti 
Published: August 2024

AbstractLymphatic filariasis (LF) is globally considered a neglected tropical disease (NTD), as well as the second leading cause of disability. The financial and social burden of LF is significant and has an impact on the patient's ability to work, participate in social activities, and raise a family. Diethylcarbamazine (DEC), an antifilarial medication, is currently the preferred treatment for LF. However, its use can have some short-term adverse events. So, the effective management of LF is the need of the hour for preventing disease progression and episodes of acute adenolymphangitis. This article attempts to review the available literature on homeopathic intervention, which is an alternative, cost-effective and safer therapeutic option in the treatment of LF. A comprehensive search was made for studies conducted from 1980 to 2019 in different databases and resources, including PubMed, ScienceDirect, and Google Scholar. In addition, a manual search of monographs and research studies of the Central Council for Research in Homoeopathy (CCRH) related to filariasis was conducted through the AYUSH Research Portal, Archive on Homoeopathy, and CCRH e-library. According to study design, aims and objectives, sample size, study duration, intervention, outcome parameters, and results, the literature that is currently accessible has been categorized. Out of 15 studies screened, 8 related to homeopathy on LF were selected for this review. Of these, 1 randomized open label comparative trial, 2 single-blind nonrandomized placebo-controlled trials, 4 single-arm interventional trials, and 1 retrospective observational study were found. Except one single blind placebo-controlled nonrandomized study, the outcomes of other studies were found to be in favor of homeopathy. The review shows that there may be some beneficial effects of homeopathy in the management of LF. However, there are inconsistencies, gaps in the study, and insufficient outcome measures in the included literatures, which make it impossible to draw any firm conclusions. Subsequent research endeavors ought to surmount these challenges and conform to enhanced research design and methods.
A dual-band polarization independent dielectric metasurface-based absorber for sensing application in the visible light regime
Authors: Younesiraad Hemn , Sharifi Hadi , Masoumi Reza , Bemani Mohammad 
Published: August 2024

Abstract
We present a dual-band, polarization-independent dielectric terahertz absorber exhibiting near-perfect absorption and minimal reflection at frequencies of f
1 = 419 THz and f
2 = 528 THz. Using electromagnetic theory, we modeled the structure to derive the surface electric admittance and magnetic impedance of the metasurface, elucidating the conditions required for perfect absorption in terms of inverse electric and magnetic polarizabilities. The absorber features a tunable symmetrical design, facilitating precise frequency adjustment by modifying structural parameters and ensuring polarization independence for perpendicularly incident electromagnetic waves. This scalable and versatile absorber, constructed from readily available materials, is optimally suited for applications in resource detection, imaging, sensing, and medical diagnostics, attributed to its simplicity, cost-effectiveness, and high performance.
Stability analysis for passive robots walking on inclined surfaces with local angles
Authors: Zhou Yining , Sun Zhongkui , Zhao Nannan , Xu Wei 
Published: August 2024

Abstract
For common-legged robots with a kind of stiff joints, the human-like and consecutive gait shown by passive walking robots is a bit difficult to achieve because of varying degrees of control, which is usually accompanied by computational cost. Of course, passive dynamic walking undoubtedly has its inevitable disadvantages because of the lack of control, which is stability. At the same time, the significant nonlinearity of the passive gait increases the difficulty of realizing the walking stability of the passive robot. Therefore, the passive robot still needs certain control to achieve stable walking even on the natural plane or smooth slope. In this paper, a passive robot model walking on an inclined plane with a local angle is studied. First of all, the approximate solution of the nonlinear dynamic equation is given by the perturbation method, and the conditions for the robot to achieve stable walking without external forces are obtained. Further, the input-output feedback linearization control based on hybrid zero dynamics is employed to carry out virtual constraints on the passive robot during the swing stage of walking, facilitating the transition from the unstable state to the stable periodic state. From the result of the experiments, the walking stability of the passive robot is improved over a larger range of walking status values compared with the condition without external force control, and the use of this method reduces the complicated work of solving the fixed point. These findings possibly have reference value in passive walking stabilization control. Meanwhile, the simulation results obtained by designing and studying the minimum controlled walking model show that human walking is based on the uncontrolled mechanical process. The exploration of the mechanism of passive gait can provide some enlightenment to the research of human texture and the application of exoskeleton.
Why cosmic voids matter: mitigation of baryonic physics
Authors: Schuster Nico , Hamaus Nico , Dolag Klaus , Weller Jochen 
Published: August 2024

Abstract
We utilize the Magneticum suite of state-of-the-art hydrodynamical, as well as dark-matter-only simulations to investigate the effects of baryonic physics on cosmic voids in the highest-resolution study of its kind. This includes the size, shape and inner density distributions of voids, as well as their radial density and velocity profiles traced by (sub-) halos, baryonic and cold dark matter particles. Our results reveal observationally insignificant effects that slightly increase with the inner densities of voids and are exclusively relevant on scales of only a few Mpc. Most notably, we identify deviations in the distributions of baryons and cold dark matter around halo-defined voids, relevant for weak lensing studies. In contrast, we find that voids identified in cold dark matter, as well as in halos of fixed tracer density exhibit nearly indistinguishable distributions and profiles between hydrodynamical and dark-matter-only simulations, consolidating the universality and robustness of the latter for comparisons of void statistics with observations in upcoming surveys. This corroborates that voids are the components of the cosmic web that are least affected by baryonic physics, further enhancing their use as cosmological probes.
Thermal conductivity analysis of nanofluid through laser speckle method
Authors: Sa Jayashree , Tripathy Amita , Nath Ganeswar 
Published: August 2024

Abstract
The significance of laser interaction in assessing the stability of colloidal CeO2 nanoparticles (NPs) in water medium is highlighted in this study. Utilizing the laser speckle technique, a non-destructive optical method, the activities of NPs synthesized in continuous wave (CW) mode are examined. The size of the cerium oxide NPs is determined through Particle Size Analyzer technique. The fluctuation in intensity of laser speckle scattered from various particles reflects the configuration of NPs in the base fluid medium, offering valuable insights into their stability. Further confirmation of NP stability is obtained through UV–Visible absorption spectroscopy. The examination of CeO2 NPs in deionized water is conducted with a CW mode He–Ne laser operating at 632 nm. This laser interaction approach proves to be instrumental in evaluating the thermal properties of the prepared samples, particularly the thermal conductivity, which shows enhancements at varying concentrations and temperatures. The findings demonstrate the potential of fabricating CeO2-water nanofluids with improved thermal conductivity through laser interaction in a liquid medium, thereby eliminating the need for hazardous chemicals and vacuum conditions. This suggests promising applications in medium-temperature scenarios.
Leveraging Frequency and Spatial Domain Information for Underwater Image Restoration
Authors: Zhang Haopeng , Xu Hongli , Yu Xiaosheng , Zhang Xiangyue , Wu Chengdong 
Published: August 2024

Abstract
Underwater image restoration is pivotal for enhancing the visual perception of underwater robots by improving image visibility and quality. Typically, underwater images are compromised by color distortion, low contrast, and noise, which degrade the robots’ environmental perception. This paper introduces FS-Net, an innovative approach that synergistically utilizes information from both the frequency and spatial domains to overcome these challenges. By strategically separating and processing different frequency components, FS-Net effectively reduces noise and preserves intricate details. Concurrently, advanced spatial domain filtering and enhancement techniques are employed to augment contrast and rectify color distortions. This dual-domain integration ensures a comprehensive and efficient restoration process. We rigorously evaluate FS-Net using a well-established underwater image dataset, where it demonstrates substantial enhancements in both visual quality and quantitative performance metrics over existing methods. This work significantly advances underwater imaging technology, offering a robust solution that markedly improves image clarity and utility for underwater robotic applications.
UAV Control With Terminal Velocity Vector Constraints
Authors: Cui JiaXiang , Fang Ke 
Published: August 2024

Abstract
The paper focuses on the UAV(Unmanned Aerial Vehicle) control strategy with terminal velocity vector constraints. Given the constraints on the position, velocity magnitude and velocity vector of points A and B, it uses a polynomial trajectory to plan a smooth continuous way that satisfies the constraints. To resolve the problem that the traditional cascade PID cannot control the position and velocity at the same time, it improves the cascade PID structure. Finally, a case study is provided to prove the algorithmic strategy. The result shows that, it satisfies the constraints on the terminal velocity vector.
Research on Underwater Skylight Orientation Based on Polarization
Authors: Yan Dekun , Ruan Yaohuang , Wang Xiaotong , Chen Yujie , Kong Fang 
Published: August 2024

Abstract
Underwater skylight polarization orientation possesses various advantages, including high precision, strong anti-interference ability, high information acquisition rate, and the absence of error accumulation over time. To compute the polarization distribution of underwater skylight polarization image data, an image conversion algorithm is proposed. Subsequently, the least squares method is employed to extract the solar meridian from the polarization images, facilitating the calculation of underwater skylight polarization distribution and the high-precision extraction of polarization information. Through experiments conducted in different environments and at various time periods within the same location, a comparative analysis was undertaken between the azimuth angle of the solar meridian extracted from the actually detected polarization distribution maps and the solar azimuth angle simulated based on single Rayleigh scattering. The experimental data exhibited slight discrepancies, thereby validating the stability of underwater polarization distribution and the feasibility of determining the solar meridian direction.
A Novel Algorithm for Tire-Road Friction Coefficient Estimation Using Adaptive Backpropagation Neural Network
Authors: Bei Zequn , Chen Xiang , Zhao Wanzhong , Wang Chunyan 
Published: August 2024

Abstract
The recognition of road conditions is highly significant for improving the active safety of vehicles. Among them, the estimation of tire-road friction coefficient (TRFC) is particularly important. However, TRFC is difficult to measure directly by onboard sensors. In this paper, a novel scheme based on Cubature Kalman filter (CKF) and an adaptive backpropagation neural network (ABPNN) is proposed to estimate the TRFC. Firstly, a nonlinear 3-degree-of-freedom vehicle model and a Magic Formula tire model are established. Then, Cubature Kalman filter (CKF) algorithm is presented to estimate the vehicle driving state. Then, BP neural network is combined with adaptive learning rate to estimate TRFC. Finally, the estimation algorithm was validated using Carsim/Simulink. The co-simulation results show that the proposed algorithm has remarkable estimation accuracy and is suitable for different complex road conditions.
Contactifications: a Lagrangian description of compact Hamiltonian systems*
Authors: Grabowska Katarzyna , Grabowski Janusz , Kuś Marek , Marmo Giuseppe 
Published: August 2024

Abstract
If η is a contact form on a manifold M such that the orbits of the Reeb vector field

R

form a simple foliation

F

on M, then the presymplectic 2-form

d

η

on M induces a symplectic structure ω on the quotient manifold

N
=
M

/

F

. We call

(
M
,
η
)

a contactification of the symplectic manifold

(
N
,
ω
)

. First, we present an explicit geometric construction of contactifications of some coadjoint orbits of connected Lie groups. Our construction is a far going generalization of the well-known contactification of the complex projective space

C

P

n
−
1

, being the unit sphere

S

2
n
−
1

in

C

n

, and equipped with the restriction of the Liouville 1-form on

C

n

. Second, we describe a constructive procedure for obtaining contactification in the process of the Marsden–Weinstein–Meyer symplectic reduction and indicate geometric obstructions for the existence of compact contactifications. Third, we show that contactifications provide a nice geometrical tool for a Lagrangian description of Hamiltonian systems on compact symplectic manifolds

(
N
,
ω
)

, on which symplectic forms never admit a ‘vector potential’.
Effect of coffee type composition ratio and brewing temperature on the physicochemical and organoleptic properties of Arabica-Excelsa brewed filter coffee
Authors: Purwanto EH , Mahendra AR , Sunardi  , Aunillah A , Wibowo NA , Wardiana E 
Published: August 2024

Abstract
Arabica coffee is popular for its good quality and Excelsa coffee has a unique taste but rarely, both have the potential to be combined. The research was carried out to study the effect of the Arabica-Excelsa blending ratio and brewing temperature with the pour-over method on brewed filter coffee’s physicochemical and organoleptic properties. The research design was a completely randomized design with two factors: the percentage ratio of coffee types and different brewing temperatures. The analyses carried out were on the organoleptic properties (flavor, aftertaste, and overall) and physicochemical properties (antioxidant activity, caffeine content, pH, and total dissolved solids [TDS]) of brewed coffee. The results of this study indicated that the interaction between two factors had a very significant effect on the organoleptic and chemical characteristics. Increasing the percentage ratio of arabica composition results in higher antioxidant activity, caffeine content, acidity (low pH), and TDS. The high consumer preference based on the organoleptic properties of the Arabica composition >50% can be equaled by the Excelsa composition >50% at a brewing temperature of 90 °C, with Excelsa having the advantage in aftertaste attributes. Meanwhile, with an Arabica-Excelsa ratio of 50%:50%, the most preferred is at a brewing temperature of 80 °C.
Mechanical Properties Characteristics of Sago Starch and Chitosan-Based Edible Films with Varying Concentrations
Authors: Lintang Meivie , Layuk Payung , Joseph Gabriel , Winanda Elisa , Sondakh Joula , Kairupan Agustinus , Polakitan August 
Published: August 2024

Abstract
This study aimed to obtain the mechanical properties of edible films based on sago starch and chitosan at various concentrations of glycerol and chitosan. The study used a completely randomized design for the combination of sago 2.5%, chitosan 0.5%, and glycerol treatment variations, with six treatments and three replicates. Additional research was conducted on differences in chitosan, starch, and glycerol concentrations. The mechanical properties of the edible film in the form of thickness, elongation value, tensile strength, and WVTR value at 2.5% starch concentration tended to increase with increasing glycerol concentration. The highest edible thickness of the film was obtained by the addition treatment of glycerol (7 grams) with a thickness of 0.268 cm; the greatest elongation value was found in the addition of glycerol (6 grams) of 30.69%; the greatest tensile strength (2.9130) was obtained in glycerol (8 grams); and the lowest WVTR value was in glycerol (2 grams) with a value of 7.51250 g/m2/hour. Increasing the chitosan concentration in the chitosan-coated starch film increases tensile strength and elongation while lowering the WVTR value. The 1.5-gram sample yielded a WVTR of 9.982 (g/m2/jam), a tensile strength of 2.74 MPa, and an elongation of 16.0066%.
Improvement of the quality of garlic bulbs with long light treatment using LED light
Authors: Aziz H , Rahayu S T , Cartika I , Soetiarso T A , Basuki R S 
Published: August 2024

AbstractGarlic is one type of vegetable that is strategically developed. Its need increases every year as the main spice of cuisine in Indonesia and a functional food that is beneficial to human health. Improvements in cultivation technology need to increase productivity, among other things, by increasing the length of lighting with white LED lights. This study evaluates the quality of garlic bulbs produced using white LED lights. The research was conducted in the experimental garden of the Indonesian Vegetable Research Institute (IVEGRI) in Lembang at an altitude of 1200 meters above sea level in March–October 2021. Varieties used are Tawangmangu Baru. The lighting duration consists of 4 treatments: 3 hours, 5 hours, 7 hours, and control (without lighting). The addition of lighting by LED lights begins at 18.00. The remote controller sets the length of lighting. Lighting was given to all experimental plants in the field. Garlic bulbs from the harvest were observed, including diameter, texture, moisture content, ash content, TSS (Total Soluble Solute), and VRS (Volatile Reducing Substance) content. The design carried out is a group random design. The data obtained were analyzed for variance (ANOVA) using SPSS software and further tested with Duncan’s Multiple Distance Test at a 95% confidence level. The results showed that the long lighting treatment significantly affected tuber weight, texture, ash content, and TSS. In three hours, lighting treatments, the weight of the bulb was significantly than the control (without lighting). TSS content in the five hours lighting treatment were higher than in other treatments.
Enhancing Water Sustainability in Greenhouses: A Study on Rainwater Harvesting Potential for Crop Water Supply
Authors: Sirait S , Suhardiyanto H , Saptomo S K , Liyantono  
Published: August 2024

Abstract
Climate change influences water availability and agricultural development in greenhouses in Tarakan City, North Kalimantan, Indonesia. Water scarcity can diminish crop yields, endangering food security and the environment’s future sustainability. Despite the fact that the study area receives a lot of rainfall, much of it is wasted. During the rainy season, there is an excess of water, but much of it becomes runoff, and flooding is frequent. The study investigates the feasibility of rainwater harvesting from the greenhouse rooftop of the University of Borneo Tarakan to supply crop water demands. The research stages included an examination of dependable rainfall, an examination of harvested rainwater volume, and crop water demands in the greenhouse. During 2001–2020, the rooftop rainwater harvesting system of the 120 m2 greenhouse has the potential to yield an average volume captured of 22.26 m3/month and the cumulative volume captured reaches 1771.15 m3/year. The efficiency of the rainwater harvesting system reaches 100%, it can fully fulfill the water needs of tomato crops grown in the greenhouse with an average volume demand of 10.06 m3/month. The greenhouse’s rainwater harvesting system has the capability to produce 12.20 m3/month of surplus water while maintaining environmental sustainability.