bluuebunny/crossref_metadata_2025_split huggingface dataset:
The mass of simple and higher-order networks
Authors: Bianconi Ginestra 
Published: November 2023

Abstract
We propose a theoretical framework that explains how the mass of simple and higher-order networks emerges from their topology and geometry. We use the discrete topological Dirac operator to define an action for a massless self-interacting topological Dirac field inspired by the Nambu–Jona-Lasinio model. The mass of the network is strictly speaking the mass of this topological Dirac field defined on the network; it results from the chiral symmetry breaking of the model and satisfies a self-consistent gap equation. Interestingly, it is shown that the mass of a network depends on its spectral properties, topology, and geometry. Due to the breaking of the matter–antimatter symmetry observed for the harmonic modes of the discrete topological Dirac operator, two possible definitions of the network mass can be given. For both possible definitions, the mass of the network comes from a gap equation with the difference among the two definitions encoded in the value of the bare mass. Indeed, the bare mass can be determined either by the Betti number β
0 or by the Betti number β
1 of the network. We provide numerical results on the mass of different networks, including random graphs, scale-free, and real weighted collaboration networks. We also discuss the generalization of these results to higher-order networks, defining the mass of simplicial complexes. The observed dependence of the mass of the considered topological Dirac field with the topology and geometry of the network could lead to interesting physics in the scenario in which the considered Dirac field is coupled with a dynamical evolution of the underlying network structure.
CFD Simulation on the Effect of Adding Dimple Balls Stagger Position on Base Plate on the Performance of V-Corrugated Air Heating Solar Collector
Authors: Hakam Mohamad , Nugroho Priyambodo Nur Ardi , Habibah Ummi 
Published: November 2023

Abstract
The ever-increasing increase in energy consumption requires great attention. Therefore, efforts need to be made to find new energy sources, such as solar energy. The absorber plate absorbs solar energy in the form of radiation, and heat is transferred by convection to the working fluid through the solar collector. Increasing the thermal efficiency of the solar air collector by modifying the absorption area using a v-corrugated absorber and also increasing the convection heat transfer coefficient by creating turbulence in the heat transfer area. Flow turbulence can be achieved by providing a disturbance in the form of a dimple in the working fluid channel above the base plate. This research was conducted utilizing numerical simulations and experiments. CFD simulation aims to obtain the most optimum ratio of ΔT/ΔP values of diameter and dimple distance using ANSYS Fluent software with a diameter variation of 6mm, 8mm, 10mm, and 45mm spacing; 50mm, and 5mm. Based on the results of CFD simulations that have been carried out on each variation of the distance and diameter of the dimple, it can be concluded that the closer the distance between the dimples, the smaller the resulting pressure drop, and the larger the diameter of the dimple, the greater the resulting temperature value. The use of a larger dimple diameter results in an increase in the heat transfer area and further increases the outlet temperature. The expected ratio is the value of the largest temperature increase and the smallest pressure drop. In the calculation of the total ratio, the dimple diameter of 10 mm with a distance of 45 mm has the highest ΔT/ΔP ratio value.
Design and Fabrication of SNI Helmet on Free Fall Test Using the Ulrich Design Method
Authors: Hakam Mohamad , Afif Muhammad Nur , Bisono Fipka , Nugroho Priyambodo Nur Ardi , Ardliana Thina , Dhika Aditya P , Indrawan Rizal 
Published: November 2023

Abstract
SNI helmets have the highest assessment criteria in the digestive process regarding design, production, and market-to-target buyers. The design of this helmet emphasizes functionality rather than aesthetics. Careful planning must be done because it is the primary goal of this research, the theoretical basis of the fourth and fifth editions of the Ulrich method of product design development with score screening and concept selection using the product design style to be able to find complex case problems with great detail and reduce large production costs because of solving cases by maximizing the results of planning and designing the third concept with a score of 3.4 and a rate of 13 is the best, and the concept was chosen because it excels in the four selected aspects. Hence, proceed to the fabrication process. In the following score assessment, it is hoped that the parameters will be much more detailed to maximize the function and get closer to the details of the assessment so that it can be valid and objective.
Construction of Fishing Vessel Molding with A Case Study of Ship Objects for The Java South Sea Region
Authors: Karyono Tri , Setiawan Bambang Teguh , Herijono Boedi , Budianto  
Published: November 2023

Abstract
In the process of building fiberglass boats (FRP), mold or molding is needed to make the hull and superstructure. Molding can be made of several kinds of main constituent materials including steel, wood, aluminium, HDPE and others. The object of the case study was carried out by collecting data from existing ships at the South Coast of the Java Sea. Molding is the main means in the fabrication process for fiberglass boats. To find out how long the mold or molding can be used, a service life analysis is needed. In terms of current technology, the analysis method uses structural fatigue analysis or fatigue analysis. In the calculations, the design is carried out earlier by conducting modelling simulations. In the fatigue analysis of the molding structure, material data is required to be applied to the molding. This will provide input data at the preprocessing stage in the finite element method. Furthermore, if the lifetime results are known at the age of the mold, then it can be continued with making the fishing boat molding product. So that later it can provide an illustration for shipbuilders that the time or age of the mold can be used for the time that has been designed.
Harnessing Technology for Environmental Method: Cultivating High Order Thinking Skills for Sustainable Maritime Development Knowledge
Authors: Hanan Abdul , Marjani Gustiana Isya , Suherman Usep , Firdaus Ahmad , Albustomi Ahmad Gibson , Solehudin  , Goffary Irfan , Anwar Saeful , Mu’min  , Arken M. Rachmatullah 
Published: November 2023

Abstract
There The objective of this research is to identify effective strategies for leveraging technology to enhance the understanding of students and practitioners in the maritime sector regarding Higher Order Thinking Skills (HOTS). Furthermore, it aims to underscore the importance of designing relevant and up-to-date curricula while offering suitable learning platforms that align with technological advancements. Employing a quantitative approach, the study indicates that HOTS-based learning has an impact on increasing maritime awareness among students in Bandung city. This study illuminates’ phenomena in the realm of maritime education and the potential integration of technology in fostering High Order Thinking Skills (HOTS). The research findings highlight that the integration of HOTS represents an effective approach to enhance analytical capabilities, promote active involvement, enhance creative problem-solving abilities, and ultimately instill enduring environmental consciousness. These research findings provide a robust foundation for concluding that the implementation of Learning-based HOTS methods significantly enhances sustainable maritime knowledge and awareness.
Recovery of sugarcane bagasse as adsorbent for chromium (Cr) (III) removal
Authors: Apriani Mirna , Nindyapuspa Ayu , Cahyani Friska Dyah Ayu Febri , Nugraha Anggara Trisna 
Published: November 2023

Abstract
The aim of the study was to explore the ability of bioactivated carbon on Cr III removal. Chromium (III) is one of the heavy metals, toxic and harmful for human being causing spread pulmonary fibrosis disease. Adsorption is one of the alternatives and an effective purification and separation technique used in industrial wastewater treatment. Bioactivated carbon was obtained from sugarcane bagasse based agricultural biomass waste by furnace dried carried out at 400°C for 2h, activated by chemical using phosphoric acid. Bioactivated carbons were used to treat chromium (III) from artificial wastewater containing chromium. Cr (III) removal was investigated by the batch process with adsorbent dose, contact time and particle size to finding optimum conditions as an experiment variable. Bioactivated carbon resulting have surface area of 309.44 and 3133.82 m2/g, respectively for sizes 150 and 200 mesh using BET measurement. The predominance of carbon achieving 80.24%, 18.68% and 1.08% respectively for element C, O and Si, identified by SEM-EDX analyser. The optimum condition of the batch adsorption achieving 99.9% chromium removal, resulting from operation condition in 30 minutes contact time using 6 g adsorbent 200 mesh.
Effect of Graphite Addition on Thermal Behaviour of Metakaolin-Geopolymer Coating for Fire Protection of Steel
Authors: Putri Rena Yulia , Pratiwi Wiwik Dwi , Widiana Dika Rahayu , Aurora Tya Amalia Veridian , Auliyasari Inshiro 
Published: November 2023

Abstract
Geopolymers are inorganic binders that resulted from the alkali activation of aluminosilicate powder. Usually, geopolymers possess better high-temperature resistance than Portland cement-based materials. This makes them a promising candidate for high-temperature applications as well as for fire protection coating. The geopolymers pastes have been the focus as an intumescent coating. This study emphasizes the geopolymer pastes from metakaolin and silica fume precursors with the additive of graphite powder and intumescent compounds. The coupons test was made of carbon steel plate 50mm x 50mm x 4mm. Since steel loses a major of its mechanical properties at 500°C, then the time-temperature curve for the coated-steel plates was created from fire testing, compared to the naked steel. Moreover, the visual appearance and the SEM structure were recorded. It is found that the addition of graphite to geopolymer improves the fire resistance of geopolymer but does not affect the intumescent behaviour. is found that the geopolymer paste graphite addition did not result in better fire resistance.
Community Skill Development for the Use of Galvalume Composite Concrete Materials for Building Structural Parts
Authors: Mudjanarko Sri Wiwoho , Julianto Eko , Indartono Arie , Basuki Rahmat M. , Putu Artaya I , Rasidi Nawir , bahaswan Rizal , Harmanto Dani , Wiwoho Firdaus Pratama 
Published: November 2023

Abstract
Galvalume material is often known as Cold Formed Steel material. Galvalume is one component that is often used by the people of Indonesia as a building structure material. Galvalume is easy to use, easily available in the market, and relatively inexpensive. Mild steel profiles can be used instead of roof trusses made of wood and concrete. The problem so far is that innovation regarding the use of Galvalume material has not been widely used for building structures without being wrapped in concrete. In this study, a trial was conducted and the introduction of the application of the use of Galvalume to building structural materials. The methodology is carried out using galvalume which is made as a composite concrete stiffener. Composite concrete testing is only at the concrete compressive strength test stage. The results of the concrete panel test show that the galvalume material can be used and the workers who work on it are not too difficult to do.
Learning From Field Testing Experiences for Developing Small Scale Tidal Current Energy Conversion System
Authors: Rasgianti  , Mukhtasor  , Rahmawati Shade , Erwandi  , Juniarto Sony , Nugraha Ariyana Dwiputra , Simaremare Arionmaro Asi , Sitanggang Ruly Bayu 
Published: November 2023

Abstract
Tidal current energy conversion system (TCECS) has been tested in potential straits such as the Larantuka Strait and Madura Strait. In its development, the technology will be improved by increasing its capacity to 100 kW. The new capacity is planned to use a farming system with vertical axis turbines. The experience of installing and operating a TCECS prototype with a capacity of 10-20 kW in Indonesia could be a valuable experience for the implementation phase of a TCECS with a higher capacity. This paper aims to report the experience of TCECS installation in Indonesia. According to previous installation experience, TCECS was made floating using a catamaran type as a supporting structure. This was done to facilitate the transportation process from the production site to the installation site. TCECS production was carried out in an area that is quite far from the installation area because there is not enough land around it to assemble or produce the technology. This condition is one of the factors that need to be considered in the TCECS installation step in Indonesia. Another factor to consider is the size of the TCECS technology to be utilized. The Installation facilities in Indonesia, especially in the eastern region, have been yet inadequate in using large equipment, e.g., a heavy crane. Therefore, the dimensions of the TCECS to be installed should not have large dimensions. To take the experience of the installation, other factors are described in several chapters in this paper.
Analysis Adhesive Strength of Epoxy DGEBA on The Wooden Boat Hull
Authors: Imah Luluk K , Putu Arta Wibawa I , Gafur Abdul , Widodo Eriek W.R. , Dianita W , Tamimah Nimatut , Sumardiono  , Agung P.U , Abdullah Kharis , Dhiya Anissa U 
Published: November 2023

Abstract
Epoxy is a thermosetting material that is widely used as an adhesive. Epoxy has the advantages of good tensile strength, bending strength, and thermal stability. Epoxy is an adhesive that can bind various materials such as steel, copper, wood, iron, cement, plastic, and composites. Epoxy can be cured at room temperature with the addition of a hardener (curing agent). The curing agent affects the strength, hardness, durability, and adhesion strength of the epoxy. Along with the advancement of shipping technology, other alternatives were found in the construction of wooden ships, namely the laminate system. Wood lamination usually uses an epoxy resin material. Research on the strength of laminated materials for wooden hulls is an interesting scientific discussion to obtain new alternative materials that can be applied to wooden hulls. With this lamination method, it is very possible to replace wood because, with lamination, the material in addition to having better strength is also easy to obtain at a cheaper price than wood. Considering that this laminate material is still rarely used on ships, it is necessary to test the adhesive material. This research was conducted to see the mechanical characteristics and evaluate the use of laminated materials. The tests carried out included tensile test, and adhesive test which were carried out in the laboratory to obtain results to analyse the strength and durability of the wooden hull. The adhesive strength of DGEBA epoxy on teak wood has the highest adhesive strength on Epoxy-Amide with a paint coating of 4.43 MPa and tensile strength of 1.5 MPa. Meanwhile, the highest adhesive strength for Epoxy-Amine with paint coating is 4.76 MPa and tensile strength of 3.63 MPa which is applied to teak wood as a wooden ship hull material.
Assessment of hybrid MPPT for SPV based high gain cubic boost converter interfaced with reduced switch multilevel inverter for power quality enhancement
Authors: Veerabhadra J , Rao S Nagaraja 
Published: November 2023

Abstract
A high-gain cubic boost converter (HG-CBC) with hybrid-based maximum power point tracking (MPPT) through a neural network (NN) aided by the P&O technique (HNN-PO MPPT) has been suggested to acquire optimum power from a solar photovoltaic (SPV) model under varying climatic conditions. The SPV’s output is enhanced using the suggested HG-CBC as per the requirement. A detailed comparison of different conventional boost converters (BC) with the suggested HG-CBC is presented, mainly highlighting part count and boost factor (B). Using the MATLAB tool, the functionality of the developed HNN-PO MPPT technique has been examined for constant and different irradiation (G) levels. The hybrid-based MPPT helps quickly attain maximum power point (MPP) with minimum oscillations at the output. The convergence period is very short with high precision in comparison with P&O and NN MPPT. The results are examined between the suggested and traditional MPPT methods in relation to the percentage of oscillations and rise time. The Reduced Switch Multilevel Inverter (RSMLI) is proposed to integrate the SPV with the RL load. The RSMLI is compared with the conventional standard five-level MLI in relation to the quantity of DC sources, diodes, switches, capacitors, and other parts utilized. The suggested MLI involves a reduced switch count, which mitigates the overall losses during switching and hence improves the efficiency of an inverter. MLI switches are controlled using a sine Pulse Width Modulation (PWM) technique. The THD of the output current of a five-level RSMLI is 4.47%, and it falls within the IEEE 519 norm. Hence, output power quality is enhanced.
An experimental and numerical study: to investigate the switching characteristics of a field-distortion sparkgap switch in various SF6 admixtures
Authors: Kumar G Vinod , Verma Rishi , Singh Gursharn , Warrier Manoj Kumar , Sharma Archana 
Published: November 2023

Abstract
Pressurized sparkgap switch is one of the major components that is most commonly used in various pulsed-power systems and the stochastic closure time delay (t

d
) and jitter (σ

d
) in this gas discharge switch has substantial effect on the temporal characteristics of output pulse. Experimental investigations performed with various volumetric concentrations of SF6 in SF6-N2, SF6-dry air and SF6-Ar admixtures evidenced that the intrinsic parameters of the switch such as time delay and jitter were found to be strongly dependent on the nature of gas, volumetric concentration of SF6 in admixture and rate of rise of voltage (dV/dT) of applied trigger pulse for e.g. in SF6/N2 admixture experiments as the concentration of SF6 was increased from 5% to 50% the average time delay and jitter was consequently increased from 278 ns to 413 ns and 17 ns to 56 ns, respectively. The similar increasing trend was observed even in SF6/dry air and SF6/Ar admixture experiments. It was also observed in the investigation that the variation in time delay and jitter is relatively much lesser for the condition when fast rising trigger pulse having slew rates ∼500 V ns−1 is applied than that of trigger pulse with lower dV/dT of ∼3 V ns−1. To further corroborate the stochasticity of streamer discharge in experimented SF6 admixtures, numerical studies have also been carried out by using a Particle-In-Cell/Monte Carlo Collision (PIC/MCC) model. Our experimental and simulation results infer that SF6/Ar admixture with low SF6 concentration is a superior alternative than pure SF6 for pulsed power switching applications.
Application of kernel principal component analysis for optical vector atomic magnetometry
Authors: McKelvy James A , Novikova Irina , Mikhailov Eugeniy E , Maldonado Mario A , Fan Isaac , Li Yang , Wang Ying-Ju , Kitching John , Matsko Andrey B 
Published: November 2023

Abstract
Vector atomic magnetometers that incorporate electromagnetically induced transparency (EIT) allow for precision measurements of magnetic fields that are sensitive to the directionality of the observed field by virtue of fundamental physics. However, a practical methodology of accurately recovering the longitudinal angle of the local field through observations of EIT spectra has not been established. In this work, we address this problem of angle determination with an unsupervised machine learning algorithm utilizing nonlinear dimensionality reduction. The proposed algorithm was developed to interface with spectroscopic measurements from an EIT-based atomic rubidium magnetometer and uses kernel principal component analysis (KPCA) as an unsupervised feature extraction tool. The resulting KPCA features allow each EIT spectrum measurement to be represented by a single coordinate in a new reduced dimensional feature space, thereby streamlining the process of angle determination. A supervised support vector regression (SVR) machine was implemented to model the resulting relationship between the KPCA projections and field direction. If the magnetometer is configured so that the azimuthal angle of the field is defined with a polarization lock, the KPCA-SVR algorithm is capable of predicting the longitudinal angle of the local magnetic field within 1 degree of accuracy and the magnitude of the absolute field with a resolution of 70 nT. The combined scalar and angular sensitivity of this method make the KPCA-enabled EIT magnetometer competitive with conventional vector magnetometry methods. © 2023. All rights reserved.
Selective fluoride ion sensing in aqueous medium using ultrathin film of functionalized single-walled carbon nanotubes
Authors: Taneja Parul , Manjuladevi V , Gupta R K , Gupta K K 
Published: November 2023

Abstract
The presence of fluoride ion (F
-
) in potable water above its permissible limit (1–4 ppm) poses serious health hazards. Hence, detection of fluoride in potable water is essential. The π-electron rich single-walled carbon nanotubes can interact with F- to form semi-covalent C-F bond which can act as a basis for F
-
sensing in aqueous medium. Here, a single layer of octadecylamine functionalized single-walled carbon nanotubes (ODA-SWCNTs) was transferred onto solid substrates by the Langmuir–Schaefer (LS) method and employed for sensing of F- in aqueous medium by recording piezo and electrochemical responses, simultaneously using an electrochemical quartz crystal microbalance. The lowest detectable concentration and range of detectable concentration of fluoride ion were found to be 0.5 ppm and 0.5–145 ppm, respectively. The analysis of the LS film of ODA-SWCNTs before and after interaction with fluoride ion by Raman spectroscopy and grazing angle x-ray diffraction measurement reveals perturbation of π-electrons of the SWCNTs due to semi-covalent binding of the fluoride with the carbon atom of the nanotubes. The sensor showed a good selectivity towards the F- in the presence of some heavy metal ions. Testing of the sensor towards F- in tap water obtained from some local region showed a good accuracy.