bluuebunny/crossref_metadata_2025_split huggingface dataset:
Computational mathematics applied in the identification of the risk of indirect contagion of COVID-19 in university classrooms
Authors: Arceo-Díaz S , Bricio-Barrios E E , Carrillo-Alcaráz J , Lua-Madrigal O , Moreno-Peña J R 
Published: June 2023

Abstract
This exploratory study evaluated the risk of contagion from airborne diseases, such as coronaviruses, in schools. For three days, the concentration of carbon dioxide in two university classrooms was monitored for 90 minutes, while the students took their math classes. We use these values to validate a first-order model for carbon dioxide concentration and calculate the air exchange rate indirectly (avoiding the need for expensive measurement equipment). The air exchange rate obtained allowed us to assess whether the usual ventilation systems (both natural and mechanical) are sufficient to guarantee a low risk of contagion of aerosols due to respiration. The results show that the risk of contagion is low if three factors are considered: the level of conversation within the classroom, the usage of a moisture extraction system, and the lecture duration. The risk is low if the lecture time is less than 50 minutes, the level of conversation is moderate, and a moisture extraction system is available. If these conditions are not met the risk is considerably higher even if mechanical ventilation is employed.
Bismuth ferrite-barium titanate system studies around morphotropic phase boundary
Authors: Amaya S , Perez J , Colorado H , Echavarria A , Londoño F A 
Published: June 2023

Abstract
Nowadays, the electro-electronic industry and scientific community have a great interest in improving memory devices. A candidate is the bismuth ferrite owing to the coexistence of ferroelectricity and anti-ferromagnetism at room temperature, however, a high leakage current harms their ferroelectric properties. Thus, bismuth ferrite and barium titanate solutions improve the ferroelectric properties of bismuth ferrite and optimize the magnetoelectric coupling factor. This system is called multiferroic, materials exhibit the coexistence of ferromagnetic, ferroelectric, or ferro-elastic orders, which is of interest to the scientific physics community and electronic industry. In this paper, bismuth ferrite-barium titanate system around the morphotropic phase boundary was studied and analyzed. It was observed changes in the structural properties in function of barium titanate content. Calcination temperature was determined from thermogravimetric analysis curves to powders of bismuth ferrite-barium titanate system. Ceramic bodies were densified conventionally. Archimedes’ method was used for density measure. Ceramics with densities greater than 95% were obtained. 93% of the perovskite phase was obtained from structural results. Finally, structural properties were presented and analyzed using Mossbauer spectroscopy as complementary technique. These analyses are very important in solid state physics because to contribute to understanding the phenomenology and synthesis process of multiferroic materials.
Computational analysis of structure manufactured by means of the steel framing system. Case study: industrial warehouse
Authors: Fajardo J I , Paltán C A , Palacios E G 
Published: June 2023

Abstract
A study is carried out between the traditional system of industrial warehouse construction, which is characterized using hot-rolled steel profiles, in comparison with the Steel Framing system, which uses low-thickness cold-formed steel profiles. Although the low-thickness profiles used in Steel Framing may generate mistrust, these profiles work by shape and not by mass. Steel Framing being a modern system, in our region it is not easy to find industrial warehouse constructed with low-thickness cold-formed steel profiles for the main and secondary elements, so this study not only focuses on the constructive aspects, but also contributes to understand the physical response of the Steel Framing system to different loads. Between the two mentioned systems, the seismic-resistant design of the industrial structure is also included to first check if it is possible to use the Steel Framing system in medium industrial warehouse, located in highly seismic areas, such as the coastal region of Ecuador. It has been proven that the Steel Framing system is resistant to high winds, earthquakes and other loads that are established in national and international regulations, and we proved that taking advantage of the effective properties of cold-formed profiles increases their resistance The results of drifts demonstrate the seismic resistance of the system, with the value of 0.00107 being the maximum value of inelastic drift obtained in the X direction, which represents only 5.37% of the value allowed in the standard.
Log-linear modeling between risk factors and interactions for human papillomaviruses infection and papanicolaou smear abnormalities
Authors: Cuesta-Herrera L , Torres-Mantilla H A , Quintero-Vega M , Borges-Peña R , Martínez-Jeraldo N 
Published: June 2023

Abstract
Modeling qualitative variables and their interactions often require multidimensional analysis through Log-linear models. Furthermore, these models are useful as alternatives in fields where probabilistic classification is required, such as speech recognition or pattern classification. This work uses log-linear modeling as a methodological approach to the analysis of 1114 valid cases of women participating in a human papillomavirus infection and cervical cancer screening program, thus relating a public health problem to biophysical knowledge. The objective of the study was to evaluate the main effects and interactions between the variables compared to the independence model. A backward stepwise selection with a 5% probability of elimination was performed to arrive at the best hierarchical model starting on the covariates that were significant in a previous bivariate analysis. This allows us to understand how biophysical process modeling can identify biomarkers and propose prevention methods for human papillomavirus infection and Papanicolaou smear abnormalities.
Numerical proposal to solve Maxwell’s equations in a toroidal waveguide
Authors: González-Balaguera J , Sandoval-Amador A , V-Niño E D , Barba-Ortega J 
Published: June 2023

Abstract
In this contribution, we propose a numerical solution to the Maxwell equations to determine the electromagnetic fields in a toroidal dielectric wave-guide. Analyzing the relationship between the size of the cross-section of the toroid and its bending radius. We considered a sinusoidal time dependence of the electromagnetic field, then we just solve the Helmholtz equation in the waveguide. We propose a numerical way to solve this equation and analyze for to find the power radiation in each synchronous mode. We show a numerical method by calculating the frequencies and the loss factors for any mode in square, triangular, and round waveguides.
Matricials methods applied to the solution of the Ginzburg-Landau equations
Authors: Aguirre C A , Otálora J , Mosquera Polo A S , Barba-Ortega J 
Published: June 2023

Abstract
In this contribution we propose two numerical methods for the solution of the system of two non-linear coupled differential Ginzburg-Landau equations. These proposals are based firstly on taking a matrix view considering the quasi-linear coupled system, as a second option, considering the computational molecule with its respective restriction of the values and eigen-vectors of the matrix. We clearly and concisely obtained the eigenvalues that lead us to an optimal spatio-temporal convergence solution of said system of equations. We compare the numerical convergence times obtained by these three methods with the known time found by applying the link variable method.
Development of a readout electronic prototype system for the MWDC at the ETF in HIRFL-CSR
Authors: Xu Jiapeng , Sun Zhipeng , Chang Songbo , Pu Tianlei , Yan Junwei , Kong Jie , Yang Mingyu , Sun Zhikun , She Qianshun , Qian Yi 
Published: May 2023

Abstract
This paper proposes and implements a readout electronic prototype system for a Multi-Wire Drift Chamber (MWDC) detector. This system includes Front-End Electronics (FEE), Sub_Data Acquisition (Sub_DAQ), and Common Data Acquisition Unit (CDAU). Based on a self-developed Application-Specific Integrated Circuit (ASIC) chip, the FEE amplifies and reshapes the detector signals before transmitting them via a high-density micro-coaxial cable to the Sub_DAQ. The Sub_DAQ, based on a Field-Programmable Gate Array (FPGA), was designed to process MWDC signals. The Sub_DAQ can perform an analogue-to-digital conversion, online data processing, and package transmission before transmitting the data to the CDAU via a high-speed optical fibre link. The CDAU gathered data, online processed the data, and then transmitted the data to the computer via the PCIe 3.0 interface. This paper will discuss the design process, the implementation, and the initial test results of the readout electronic prototype system.
Incipient wing flapping enhances aerial performance of a robotic paravian model
Authors: Sathe Erik Andrew , Chronister Nathan J , Dudley Robert 
Published: May 2023

Abstract
The functional origins of bird flight remain unresolved despite a diversity of hypothesized selective factors. Fossil taxa phylogenetically intermediate between typical theropod dinosaurs and modern birds exhibit dense aggregations of feathers on their forelimbs, and the evolving morphologies and kinematic activational patterns of these structures could have progressively enhanced aerodynamic force production over time. However, biomechanical functionality of flapping in such transitional structures is unknown. We evaluated a robot inspired by paravian morphology to model the effects of incremental increases in wing length, wingbeat frequency, and stroke amplitude on aerial performance. From a launch height of 2.8 m, wing elongation most strongly influenced distance travelled and time aloft for all frequency-amplitude combinations, although increased frequency and amplitude also enhanced performance. Furthermore, we found interaction effects among these three parameters such that when the wings were long, higher values of either wingbeat frequency or stroke amplitude synergistically improved performance. For launches from a height of 5.0 m, the effects of these flapping parameters appear to diminish such that only flapping at the highest frequency (5.7 Hz) and amplitude (60°) significantly increased performance. Our results suggest that a gliding animal at the physical scale relevant to bird flight origins, and with transitional wings, can improve aerodynamic performance via rudimentary wing flapping at relatively low frequencies and amplitudes. Such gains in horizontal translation and time aloft, as those found in this study, are likely to be advantageous for any taxon that engages in aerial behavior for purposes of transit or escape. This study thus demonstrates aerodynamic benefits of transition from a gliding stage to full-scale wing flapping in paravian taxa.
Entanglement dynamics of multi-parametric random states: a single parametric formulation
Authors: Shekhar Devanshu , Shukla Pragya 
Published: May 2023

Abstract
A non-ergodic quantum state of a complex system is in general random as well as multi-parametric, former due to a lack of exact information due to complexity and latter reflecting its varied behavior in different parts of the Hilbert space. An appropriate representation for the reduced density matrix of such a state is a generalized, multi-parametric Wishart ensemble with unit trace. Our theoretical analysis of these ensembles not only resolves the controversy about the growth rates of the average information entropies of the generic states but also leads to new insights in their entanglement dynamics. While the state itself is multi-parametric, we find that the growth of the average measures can be described in terms of an information-theoretic function, referred as the complexity parameter. The latter in turn leads to a common mathematical formulation of the measures for a wide range of states; it could also act as a possible tool for hierarchical arrangement of the entangled states of different systems.
Self-similar solutions to the hypoviscous Burgers and SQG equations at criticality
Authors: Ohkitani Koji 
Published: June 2023

Abstract
After reviewing the source-type solution of the Burgers equation with standard dissipativity, we study the hypoviscous counterpart of the Burgers equation. (1) We determine an equation that governs the near-identity transformation underlying its self-similar solution. (2) We develop its approximation scheme and construct the first-order approximation. (3) We obtain the source-type solution numerically by the Newton–Raphson iteration scheme and find it to agree well with the first-order approximation. Implications of the source-type solution are given, regarding the possibility of linearisation of the hypoviscous Burgers equation. Finally we address the problems of the incompressible fluid equations in two dimensions, centering on the surface quasi-geostrophic equation with standard and hypoviscous dissipativity.
Nitrate and phosphate profiles in the Banda Sea during the northwest monsoon
Authors: Hamzah F 
Published: June 2023

Abstract
The Banda Sea (BS) is subjected to monsoonal winds that affected upwelled rich nutrient waters and primary production. However, nutrient characteristic in the region is less constrained. Here, we examine nitrate and phosphate profiles in the Banda Sea from data collected during the northwest monsoon. Waters along the surface density (σθ
) < 22 were dominated by less saline originating from western Indonesia (i. e., Java Sea), accompanied by Indonesian throughflow water Banda (23.0-25.0σθ
) and Banda water (26.5-27.0σθ
), respectively. Surface water was accompanied by low nitrite+nitrate (

N
O

2

−

+

N
O

3

−

) and phosphate (

P
O

4

3
−

), meanwhile, the average

N
O

2

−

+

N
O

3

−

and

P
O

4

3
−

concentrations in the upper 500 m were slightly higher in the western part than those in the eastern part suggesting additional sources from upwelled waters. Furthermore, the average nitrite+nitrate to phosphate ratio (N:P ratio) was 11.2:1, indicating nitrogen is a limiting factor for the growth of primary producers, and other sources may play a more dominant role. Two distinct layers in the euphotic zone within different sources and mechanisms namely the nutrient-depleted layer and nutrient-repleted layer were observed. Overall, the result of this study can only be seen as a starting point toward a comprehensive and holistic understanding of the nutrient biogeochemistry of the Indonesia Seas.
The estimation of total vertical uncertainty from multibeam echosounder during MeGaMal Expedition seafloor mapping for earthquake mechanism at Maluku Sea.
Authors: Dewi Amalia Fadila Restiani , Saputra Bayu , Frederik Marina , Haryanto Dwi , Puspitasari Trevi Jayanti , Febriawan Hendra Kurnia , Hananto Nugroho Dwi , Harahap Rastamauli Jabal , Fawaiz Ahmad , Dannari Arnold , Fauzi Anan , Rahmadani Prasetya Riski , Wijaya Rendra Hadi 
Published: June 2023

Abstract
In 2022, the Indonesian government initiated the EWIN MeGaMal expedition (Ekspedisi Widya Nusantara Mekanisme Gempa Laut Maluku). The goal of the expedition is to map earthquake and tsunamigenic potential areas around Ambon Island. The expedition was carried out from 8 to 28 August 2022 using RV Baruna Jaya VIII. One of the methods used in the expedition is the multibeam echosounder (MBES) survey. To obtain an accurate bathymetry result, several stages need to be carried out. Initially, a vessel reference frame (VRF) with a defined reference point called common reference point (CRP) needs to be established. Then, sensor offsets in 3D (three-dimensional) is measured with respect to CRP. The next stage is to calibrate and validate the vessel’s differential global navigation satellite system (D-GNSS) and Heading system statically. Afterwards, a patch test dynamic MBES calibration is performed. Finally, the accuracy of the bathymetry result is analyzed in accordance with the International Hydrographic Organization (IHO) SP 44. This paper is aimed to describe each of the above methodologies and present the preliminary result. Results show that the Patch Test calibration has values of roll: -0.19°, pitch: -5.40°, and yaw: 1.09°. It is expected this expedition could contribute for mitigation of earthquakes and tsunamis in Eastern Indonesia.
Water Carrying Capacity Determination based on Ecosystem Services in GKS Metropolitan Area
Authors: Firmansyah F , Yusuf M , Jatayu A , Syafitri R A W D 
Published: June 2023

Abstract
Gerbangkertasusila (GKS) Metropolitan Area is a strategic area with an urban nature that has a very fast economic, physical, and demographic acceleration. This rapid development has caused pressure on the environment, and has caused the depletion of natural resources, especially water resources. Water resources are the most important natural resources and are related to a series of ecosystem services such as flood management, water purification, recreation and especially water supply. Water supply can be assessed from a supply and demand perspective. In Indonesia, the process of calculating the carrying capacity of water is calculated spatially using the scale grid system method. The use of this method aims to reduce the limitations of data that has different scales, to facilitate the process of merging or aggregating data to get more in-depth results. Therefore, it is interesting to use this method to assess the status of water carrying capacity in the GKS Area, given the importance of the GKS role on a local and regional scale in East Java Province. In addition, this method is relatively new, so there are not many cities in Indonesia that apply this method to assess water carrying capacity.
Analysis of the problem on street vendor relocation in Menara Kudus Tourist Area
Authors: Rahman B , Noviani A 
Published: June 2023

Abstract
This paper examines the problems in relocating street vendors in the religious tourism area of Menara Kudus. The relocation of street vendors does improve the visual quality and environment of the region, but it becomes a problem for street vendors, especially in the decline of consumers, revenue and the return of street vendors to the original location. Using qualitative methodology, this study examines the problem of relocation more deeply through depth interview analysis with street vendors. The results showed that there are problems in each parameter, such as the visibility of relocation sites whose image is less potent when compared to parks. Accessibility that this type of mode of transportation cannot traverse. The environment where the relocation is different from the flexibility of the previous environment. Limited land expansion that requires temporary arrangements related to land use. Competition with street vendors in the red zone (on street) can be in direct contact with consumers compared to the relocation of street vendors.
Analysis of Factors that Determine Investment Attractiveness in Balikpapan City
Authors: Ajeng Nugrahaning D , Frigate R. , Elin Diyah S. , Ulimaz Mega 
Published: June 2023

Abstract
Economic development has recently been delegated to local governments as a form of implementation of Regional Autonomy according to the regulations concerning Regional Government. Through regional autonomy, the development of potential and resources can be utilized and managed optimally by local governments for the benefit of the community. However, disparities between regions still occur, especially between western and eastern Indonesia. This is due to the “Java-centric” development concept that has been going on for decades. The relocation of the National Capital City (IKN) of the Archipelago is considered to be a solution for equitable development which has been centered on the island of Java and to grow the economy around the new IKN areas, especially the buffer areas. Balikpapan City is the city with the third-best GRDP in East Kalimantan Province, which is largely supported by the oil and gas processing industry. In addition, Balikpapan City is one of the buffers for IKN because its location is close to IKN and already has a several-established infrastructure. The potential possessed is expected to become an economic driver for equitable development that has been Java-centric. In addition, the transfer of IKN also aims to restore the national economy through investments in the IKN buffer. Therefore, this research aims to analyze what factors determine the attractiveness of investment in Balikpapan City. The method used in this research is the Analytical Hierarchy Process (AHP) method. Based on the results of the analysis conducted on five factors, namely bureaucracy and government, social, economic, resources, and availability of infrastructure, it was found that the main priority factor determining investment attractiveness is the availability of infrastructure.
Speeding up qubit control with bipolar single-flux-quantum pulse sequences
Authors: Vozhakov Vsevolod , Bastrakova Marina , Klenov Nikolay , Satanin Arkady , Soloviev Igor 
Published: May 2023

Abstract
The development of quantum computers based on superconductors requires the improvement of the qubit state control approach aimed at the increase of the hardware energy efficiency. A promising solution to this problem is the use of superconducting digital circuits operating with single-flux-quantum (SFQ) pulses, moving the qubit control system into the cold chamber. However, the qubit gate time under SFQ control is still longer than under conventional microwave driving. Here we introduce the bipolar SFQ pulse control based on ternary pulse sequences. We also develop a robust optimization algorithm for finding a sequence structure that minimizes the leakage of the transmon qubit state from the computational subspace. We show that the appropriate sequence can be found for arbitrary system parameters from the practical range. The proposed bipolar SFQ control reduces a single qubit gate time by halve compared to nowadays unipolar SFQ technique, while maintaining the gate fidelity over 99.99%.