bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ionization study of cyanopolyynes HCnN (n=1–17) by electron and positron impact
Authors: Thomas Bini , Gupta Dhanoj 
Published: December 2024

Abstract
In this work, we investigate how electrons and positrons interact with important space molecules, specifically cyanopolyynes HC
n
N(n=1-17). These are linear molecules detected in the interstellar medium (ISM) and observed in regions like Sgr B2, Taurus Molecular Cloud -1 (TMC-1), the circumstellar envelope of the carbon star IRC +10216, and cold molecular clouds. We apply the binary-encounter Bethe (BEB) model to determine the ionization cross sections for both electron and positron impacts on these molecules, covering an energy range from ionization threshold to 5 keV. These molecules play a crucial role in astrophysics, astrochemistry, and atmospheric studies. However, their data are limited, particularly concerning positron impact ionization, which is being calculated for the first time in this study. Due to the complexity of these molecules, experimental data are lacking and only a small amount of theoretical information is currently available. Additionally, we have calculated properties like polarizability, dipole moment and highest occupied molecular orbital (HOMO) energy for these molecules. We have also studied the correlation of the maximum ionization cross section with the polarizability and ionization energy of the targets. These data are important for understanding cyanopolyynes and will help scientists model chemical processes in space.
Study of a tilted thin accretion disk around a Kerr-Taub-NUT black hole
Authors: Sen Gargi , Chakraborty Chandrachur , Bhattacharyya Sudip , Maity Debaprasad , Chakrabarti Sayan , Das Santabrata 
Published: December 2024

Abstract
The accreting collapsed object GRO J1655-40 could contain the gravitomagnetic
monopole (GMM), and it was shown to be better described by the Kerr-Taub-NUT (KTN) spacetime
instead of the Kerr spacetime. The warped accretion disk has also been observed for the same
collapsed object. Motivated by these, we study a tilted thin inner accretion disk around a KTN
black hole. Such a tilting could have a significant effect on the X-ray spectral and timing
features via the Lense-Thirring effect. Taking into account the contribution from the inner
accretion disk for the KTN black hole, here we calculate the radial profile of a tilt
angle. Depending on the numerical values of the viscosity of the accreting material and Kerr
parameter, GMM tends the angular momentum of the disk to align along the black hole's spin axis,
or to make it more tilted. Our solution for the radial profile of the tilted disk around a KTN
black hole could be useful to probe the strong gravity regime, and could also give indirect
evidence for the existence of GMM in nature.
Length-preserving biconnection gravity and its cosmological implications
Authors: Csillag Lehel , Hama Rattanasak , Józsa Máté , Harko Tiberiu , Sabău Sorin V. 
Published: December 2024

Abstract
We consider a length preserving biconnection gravitational theory, inspired by information geometry, which extends general relativity, by using the mutual curvature as the fundamental object describing gravity. The two connections used to build up the theory are the Schrödinger connection, and its dual. In our geometric approach it can be seen that the dual of a non-metric Schrödinger connection possesses torsion, even if the Schrödinger connection itself does not, and consequently the pair (M,g,∇*) is a quasi-statistical manifold. The field equations are postulated to have the form of the standard Einstein equations, but with the Ricci tensor- and scalar replaced with the mutual curvature tensor, and the mutual curvature scalar, resulting in additional torsion-dependent terms. The covariant divergence of the matter energy-momentum does not vanish in this theory. We derive the equation of motion for massive particles, which shows the presence of an extra force, depending on the torsion vector. The Newtonian limit of the equations of motion is also considered. We explore the cosmological implications by deriving the generalized Friedmann equations for the Friedmann-Lemaitre-Robertson-Walker (FLRW geometry). They contain additional terms that can be interpreted as describing an effective, geometric type dark energy. We examine two cosmological models: one with conserved matter, and one where dark energy and pressure are related by a linear equation of state. The predictions of both models are compared with a set of observational values of the Hubble function, and with the standard ΛCDM model. Length-preserving biconnection gravity models fit well the observational data, and also align with ΛCDM at low redshifts (z < 3). The obtained results suggest that a modified biconnection geometry could explain the late-time acceleration through an effective geometric dark energy, as well as the formation of the supermassive black holes, as they predict a different age of our Universe as compared to standard cosmology.
Reheating and leptogenesis after vector inflation
Authors: Cléry Simon , Anastasopoulos Pascal , Mambrini Yann 
Published: December 2024

Abstract
We study the reheating and non-thermal leptogenesis in the case of a vector inflaton. We
concentrate on particle production during the phase of oscillating background, especially
gravitational production induced by the presence of non-minimal coupling imposed by an isotropic
and homogeneous Universe. Including processes involving the exchange of graviton, we then extend
our study to decay into fermions via direct or anomalous couplings. The necessity of non-minimal
gravitational coupling and the gauge nature of couplings to fermions implies a much richer
phenomenology than for a scalar inflaton.
Recognition of fractional vortex optical modes with a lightweight convolutional neural network
Authors: Xu Fei , Sheng Tianze , Liu Lifeng , Li Xiaolin , Qi Yihong , Qian Jun , Niu Yueping , Gong Shangqing 
Published: December 2024

Abstract
Structured light with orbital angular momentum (OAM) provides a theoretically infinite expansion dimension of optical signals, playing a crucial role in optical communications, imaging and information processing, etc. Its applications in these fields require accurate measurement and recognition of the OAM light of fine fractional topological charges. In this work, we develop a fractional OAM light recognition method based on deep learning, achieving accurate recognition of the fine fractional OAM light of a few-shot under low light intensity. We employ a lightweight convolution neural network MobileNetV2 to identify the fractional OAM pictures, which requires few computing resources and can be realized on mobile phones. The performance of our method has been validated by multiple rounds of testing, demonstrating high metrics including accuracy, precision, recall rate, and F1-score. Our work suggests a potential pathway for identifying the OAM light with simple devices and few resources, such as mobile phones and other edge computing devices.
Forces from coarse-graining non-equilibrium degrees of freedom: exact results
Authors: Santra Ion , Krüger Matthias 
Published: December 2024

Abstract
We explore the relaxation dynamics of a tracer in a harmonic trap coupled to a non-equilibrium bath particle in a stationary state, finding qualitative differences from the well-known equilibrium case. This can be attributed to an additional position- and time-dependent force acting on the tracer, emerging when averaging the bath degree in the non-equilibrium stationary state conditioned to a certain tracer position. Specifically, we provide analytical results for an overdamped tracer coupled linearly to a bath particle in different non-equilibrium scenarios; namely, subjected to a different temperature than the tracer or to active noise with Gaussian or non-Gaussian fluctuations. For the case of varying temperatures, the conditioned tracer–bath force can be as large in magnitude as the force from the trapping potential. For an active bath particle with memory, even the bath noise takes a finite average under conditioning of the tracer. Furthermore, if the noise of the bath particle is non-Gaussian, the relaxation function of the tracer can be non-monotonic as a function of time. We also compute the pinned relaxation, proposing that measurement and comparison of conditioned and pinned relaxation allows determination of the non-equilibrium forces in experiments.
Design of a Virtual Laboratory for Electrophoretic Separation Analysis
Authors: Situmorang Manihar , Munthe Lanita Bernadetta , Simanjuntak Hendra , Purba Jamalum , Sinaga Marudut , Sitorus Marham , Sudrajat Ajat 
Published: December 2024

Abstract
An experiment in Analytical Separation Chemistry is expensive because it uses expensive instrumentation, chemicals and involved skilled laboratory resources. The problem faced was that there was an experiment in a separation analysis that was not carried out due to limitation of laboratory resources. The virtual laboratory design is a good strategy for teaching the principles of separation analysis to overcome the problem in the laboratory facilities. This research aims to design a virtual laboratory to simulate electrophoretic separation analysis in Analytical Chemistry. The research was carried out by developing a virtual electrophoresis design which has the same working principle as real laboratory equipment. The research results show that virtual laboratory electrophoresis has been successfully developed and standardized. The virtual laboratory consists of learning resources containing the concept of electrophoretic separation, visualization of instrumentation work, the protocol of separation process, virtual display of electrophoretic separation results and problem solving on electrophoretic topic. A virtual laboratory product is suitable as learning media in providing knowledge of electrophoresis separation for users before carrying out actual experiments. This virtual design is a model for other virtual chemical separation laboratories, as a learning tool for users such as students, laboratory assistants and practitioners.
Study on Mangrove Land Coverage during 2013 and 2023 in Langkat Regency, North Sumatra, Indonesia
Authors: Harefa Meilinda Suriani , Damanik Muhammad Ridha Syafii , Taufik Rahmadi M , Putra Mulhady , Hidayat Syukri , Irfansyah Dwi 
Published: December 2024

Abstract
The coastal area is a complex and interconnected network of various ecosystems, with mangrove ecosystems being highly productive in carbon absorption. Mangroves play a crucial role in capturing and storing atmospheric carbon dioxide, making them an essential component in climate change mitigation. This study aims to analyze the changes in mangrove land cover in Langkat Regency from 2013 to 2023. The research was conducted in the villages of Pulau Kampai, Pangkalan Siata, Halaban, and Salahaji in Langkat Regency. Data on mangrove cover changes for the years 2013, 2018, and 2023 were obtained using Landsat 8 OLI imagery. The method used in this study was the Supervised Maximum Likelihood Classification method with a composite of bands 8, 11, and 4. The results of the study showed that the area of mangrove forests was 3,696.97 hectares in 2013, 3,259.40 hectares in 2018, and 3,755.59 hectares in 2023. There was a decrease of 437.58 hectares between 2013 and 2018. Conversely, between 2018 and 2023, there was an increase of 496.19 hectares. Overall, mangrove land cover in Langkat Regency showed an increasing trend from 2013 to 2023, with the largest increase in Pulau Pulau Kampai village at 259.79 hectares, and the largest decrease in Pangkalan Siata village at 299.57 hectares.
Characteristic of Downstream Water Thrust in Pico-scale Hydropower Based on Screw Turbine
Authors: Eswanto  , Siman  , Pasaribu Muhammad Nuh Hudawi , Hamidi M.A 
Published: December 2024

Abstract
The aim of this research is to determine the characteristics of water flow that occurs on the downstream side.The abundance of water is an advantage that can be utilized by mankind and especially for living creatures to continue life. An energy source that is still abundant and can be profitable in helping human work is water which can be used in generators to produce electricity. Hydropower is a type of generator that is environmentally friendly and easy to manufacture, provided there is a continuous flowing water source. This research focuses on picohydro scale plants, where this hydropower model can produce electricity even if the water flow is small. The research method is by direct experimentation from a prototype device on pico-hydro hydropower. In the initial stage, all measuring instruments are installed as planned and after that they are calibrated before trials are carried out in data collection. The next stage continues with the testing and measurement process to obtain the desired data. The test model used uses a screw turbine with a total of 5 windings. The results of the research show that the water pressure that reaches the downstream part does not all go straight out and leave the turbine housing, this condition is because the water partially accumulates in the body of the turbine housing where it collides with each other on the right and left sides. turbine house. The characteristics of water thrust are influenced by a number of moments, water thrust force, water pressure and water speed, each of which depends on the flow of water entered into the turbine housing to push the screw turbine blades.
PIN-photodiodes array for beam diagnostics in accelerators
Authors: Arutunian S. , Margaryan A. , Mirzoyan G. , Lazarev L. , Chung M. , Vardanyan A. , Khachatryan V. , Davtyan A. 
Published: December 2024

Abstract
Due to the specific features of their structure, PIN-photodiodes are responsive to charged particles and neutrons in addition to being sensitive to visible radiation, and can be used as detectors of neutron, proton and electron beams. In this work, a device consisting of 64 PIN-photodiodes with photodiodes spacing of 10 mm is presented. Preliminary inter-calibration of the photodiodes was performed using light irradiation at different intensities. The first experiments were performed on the electron beam of the AREAL accelerator at the beam exit from the vacuum chamber at different distances from the exit window. The obtained data were compared with the results of measurements by a reference dosimeter. The possibilities of using the proton beam facilities of the Cyclotron 18 accelerator were discussed.
Modelling and measurement of structural changes in vibrating wire using high stresses and electrical pulse embrittlement procedure
Authors: Arutunian S. , Harutyunyan G. , Margaryan A. , Manukyan N. , Mirzoyan G. , Lazarev L. , Chung M. 
Published: December 2024

Abstract
The work aims to develop a monitor that tracks structural changes in materials as they occur. Long-term on-line measurement of such changes is useful in the nuclear power engineering, where reactor vessel materials are subjected to intense neutron irradiation and embrittle with prolonged irradiation. This paper describes studies where a tension of the order of tensile strength is applied to a wire-shaped specimen so that the wire material undergoes plastic deformation. A short current pulse is then applied through the wire, which causes embrittlement of the wire. Both processes are measured by means of changes in the natural frequency of a pre-tensioned wire, which serves as a test sample. Experimental results are presented for different ratios of wire pre-tension and short pulse energy, as well as for their cyclic repetition.
Experimental setup for precise measurement of thin film thickness
Authors: Kishin I.A. , Kidanova E.Yu. 
Published: December 2024

Abstract
The paper describes an experimental setup designed to measure the thickness of metal and organic foils with an accuracy close to 3 µm. The working principle of the setup is based on the interaction between X-ray radiation and matter, specifically the reduction in X-ray intensity as it passes through a material layer. The setup allows for the control of the energy of the incident X-ray radiation within the range of 5 to 30 keV. Additionally, it can detect inhomogeneities in the foil by analysing the recorded spectrum of the X-ray radiation that has passed through the foil. For organic foils such as carbon fiber or mylar, the setup operates in the soft X-ray range up to 10 keV, utilising energy dispersive analysis of the X-ray signal that is transmitted through and scattered by the object under study.
Glycinium tribromidoplumbate(II)
Authors: Tonoyan G.S. , Giester G. , Ghazaryan V.V. , Badalyan A.H. , Chilingaryan R.Yu. , Margaryan A.A. , Mkrtchyan A.H. , Petrosyan A.M. 
Published: December 2024

Abstract
In this paper the crystal structure of glycinium tribromidoplumbate(II) (GlyH)PbBr3 (I), where GlyH is a glycinium cation (NH3CH2COOH), is reported in the orthorhombic space group P212121. The tribromidoplumbate anion (PbBr3)− is located in a general position and forms a polymeric 1D-structure. Photoluminescence at ambient conditions using 405 nm laser excitation is observed in the crystal.
Hexahalogenobismuthates of Glycine
Authors: Ghazaryan Vahram V. , Giester Gerald , Zatikyan Ashkhen L. , Tonoyan Gayane S. , Petrosyan Aram M. 
Published: December 2024

Abstract
Five new glycine salts containing zero-dimensional BiX6
3− hexahalogeno-bismuthate anions were prepared: (GlyH)3(BiCl6)·2H2O (I) (space group Pna21, Z=4), (GlyH)3(BiBr6)·2H2O (II) (s.g. Cc, Z=4), (GlyH)3(BiBr6)·3H2O (III) (s.g. P21/n, Z=4), (GlyH)4(BiBr6)(Br)·H2O (IV) (s.g. P

1

¯

, Z=2) and (GlyH)3(BiI6)·2H2O (V) (s.g. P21/n, Z=4). The (Gly+···Gly+) type centrosymmetric dimeric cation of glycine was observed for the first time in the structures (IV) and (V). Infrared spectra were registered and discussed. The bandgap values were calculated and measured.
Interband and intraband optical transitions in asymmetric ellipsoidal quantum dot
Authors: Nahapetyan A A , Mkrtchyan M A , Sarkisyan H A 
Published: December 2024

Abstract
The theoretical investigation of interband and intraband transitions in asymmetric ellipsoidal InAs quantum dot have been considered. The interband absorption coefficient dependencies from quantum dot geometrical parameters have been calculated. Linear and nonlinear absorption spectra behaviors have been observed for different geometrical sizes. Also, the second and third harmonic generation coefficients have been studied.
X-ray Diffraction by Surface Acoustic Waves at the Laboratory X-ray Source
Authors: Roshchupkin D. , Irzhak D. , Pundikov K. 
Published: December 2024

Abstract
X-ray diffraction by surface acoustic waves is investigated by the method of triple-crystal X-ray diffractometer on the laboratory source of X-ray radiation. This approach allows to determine the amplitudes of the surface acoustic waves (SAW) and to study the features of the diffraction process for different materials, to study the characteristics of fabrication of the structures of the interdigital transducers (IDT) for SAW excitation. The influence of the metallization coefficient of the IDT on the SAW excitation process is considered.
Response of some varieties of corn (Zea mays L.) toward applying granular bio-fertilizer on dry land
Authors: Ikhwan Ali , Ishartati Erny , Pamungkas Ferdian Enggar , Raidiansyah Muhammad Rafi 
Published: December 2024

Abstract
Increasing the yield of corn production on dry land can be done by applying granular biological fertilizers. Rhizobacterial biological fertilizer (Biofertilizer) is a fertilizer that contains microorganisms whose presence can be either singly or in the form of a combination of several types, called a consortium. This research aims to obtain a combination of treatments between varieties and doses of granular biofertilizer. The research was designed using a split plot design with HSD 5%. The main plot uses 4 varieties: Bisi 99, Bisi 18, Pertiwi 6, and Pertiwi 3, while the subplots use 3 doses of granular biofertilizer: 50/100/150 g per plant. The research results show a real effect on growth and yield parameters, including plant height, number of leaves, stem diameter, cob location, cob weight, cob length, cob weight without Cornhusk, cob length without Cornhusk, cob diameter, dry weight, 100-grain weight and several corn varieties. In the combination treatment of the Bisi 99 variety with 50g granule fertilizer treatment per plant, the best results reached 242.27g per cob (15.98 tons/ha).
Enhancing Shallot Growth and Yield in Ultisols through Coffee Husk Compost and Nitrogen Dosage Variations
Authors: Setyowati N , Anissa  , Fahrurrozi  , Muktamar Z 
Published: December 2024

Abstract
Fertilization is crucial for the growth and productivity of shallots (Allium ascalonicum L.). Both synthetic and organic fertilizers supply necessary nutrients for crop production. Coffee husk waste can be used to produce compost that provides both macro and micronutrients. This research aims to determine the optimal combination of synthetic fertilizer and coffee husk compost for shallot growth and yield. The study was conducted in Talang Kering, Kandang Limun Village, Muara Bangkahulu District, Bengkulu City, Indonesia. A Completely Randomized Design (CRD) with six treatments was used: no coffee husk compost + 92 kg N/ha; 5 tons/ha coffee husk compost + 73.6 kg N/ha; 10 tons/ha coffee husk compost + 55.2 kg N/ha; 15 tons/ha coffee husk compost + 36.8 kg N/ha; 20 tons/ha coffee husk compost + 18.4 kg N/ha; and 25 tons/ha coffee husk compost without N. Data were analyzed using the F test at a 5% significance level, with further analysis using LSD at 5%. The study found no significant differences among treatments in plant height and number of shallot leaves. Shallots fertilized solely with synthetic fertilizer without compost had lower shoot and bulb dry weights than those with coffee husk compost. Various combinations of coffee husk compost and N fertilizer produced similar shallot growth and yield. Thus, adding coffee husk compost improves shallot growth, which is promising for reducing synthetic fertilizer use and promoting sustainable agriculture.
Analysis of honey quantity and quality in Flora Nauli Beekeepers at Pematang Siantar, North Sumatra Province
Authors: Affandi Oding , Batubara Ridwanti , Wijayanti Amalia , Ulfa Mariah 
Published: December 2024

Abstract
The quantity and quality of honey produced from beekeeping can vary and depends on weather conditions and the availability of bee forage vegetation. This study aims to determine the quantity of honey production and the quality of honey produced at Flora Nauli Beekeeper Pemetang Siantar, North Sumatra Province. The calculation of honey quantity is done by calculating the amount of honey volume in each hive (stup) produced using the average formula. Meanwhile, the honey quality test was conducted at Sucofindo laboratory with the following parameters: diastase enzyme activity, hydroxymethylfurfural, moisture content, glucose, sucrose and acidity. The results showed that the amount of honey produced by Apis cerana bees reached an average of 397.66 ml/hive/month. The amount of honey produced by Heterotrigona itama bees averaged 187.06 ml/hive/month. While the amount of honey produced by Geniotrigona thoracica bees averaged 97.03 ml/hive/month. Meanwhile, in terms of quality, honey produced by Apis sp and Trigona sp bees is classified as good with the test results of six parameters that meet the requirements of the Indonesian National Standard (SNI). In the future, it is expected to promote the growth of other beekeepers and increase the consumption of honey in order to improve health