bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ein ungewöhnlicher Fall von Hämoptysen
Authors: Merres Julika , Fischer Pascal , Stoelben Erich 
Published: February 2025

ZusammenfassungIn der vorliegenden Kasuistik handelt sich um einen jungen Patienten mit seit mehreren Monaten vorliegenden Hämoptysen. Eine CT-Thorax-Untersuchung und Bronchoskopie zeigte den seltenen Befund eines Plattenepithelkarzinoms der Trachea. Die Ausbreitungsdiagnostik zeigte keinen Hinweis auf eine Lymphknoten- oder Fernmetastasierung. Daher entschied man sich zur kurativen Operation mittels medianer Sternotomie und Tracheaquerresektion, wobei diese von subglottisch bis Tracheamitte bei langer tumoröser Strecke durchgeführt wurde. Karzinome der Trachea sind eine seltene Ursache für Hämoptysen, an die jedoch differenzialdiagnostisch gedacht werden und die dann in einem entsprechenden Zentrum mit Expertise vorgestellt werden sollte.
Klinisches Management – neue Herausforderungen und Chancen
Authors: Kretzschmar Alexander 
Published: February 2025

ZusammenfassungAuf dem von der Universität Freiburg veranstalteten 15. Freiburg Myeloma Meeting diskutierten Ende 2024 Myelom-Experten aus den USA und Europa neue Trends in der Myelom-Forschung und -therapie. Prof. Paul Richardson, Boston, beleuchtete dabei die gegenwärtige Situation beim therapeutischen Management des multiplen Myeloms, alte und neue Herausforderungen und gab einen Überblick über die Forschungspipeline in der Therapie dieser Erkrankung.
Begünstigen Levonorgestrel freisetzende Intrauterinsysteme Krebserkrankungen?
Authors: Lorenz Judith 
Published: February 2025

ZusammenfassungViele Frauen wenden zur Behandlung von Endometriose, Dysmenorrhö oder Menorrhagien oder zur Verhütung Levonorgestrel freisetzende Intrauterinsysteme (LNG-IUS) an. Begünstigt die Progesteronfreisetzung die Entwicklung von Brustkrebs oder gynäkologischen Malignomen, also Endometrium-, Zervix- oder Ovarialkarzinomen? Und welche Rolle spielt diesbezüglich die familiäre Belastung mit Tumorerkrankungen?
Covering Anastomosis to Frozen Elephant Trunk in Secondary Downstream Aorta Replacement
Authors: Chubachi Fumiya , Yoshitake Akihiro 
Published: February 2025

AbstractThere has been an increasing number of secondary downstream aorta replacements following aortic arch repair using a frozen elephant trunk (FET). We present an anastomosis technique to join a frozen elephant graft to a downstream prosthetic graft. The FET is inserted into the downstream graft with continuous sutures, with a two-bite Dacron graft added to the frozen elephant side. This technique may prevent anastomotic leakage between two grafts.
Starmer’s election victory: from the politics of support to the politics of power
Authors: Griffiths Simon 
Published: February 2025

Abstract
Keir Starmer was elected Labour leader in 2020 after the party’s worst election defeat since 1935. Just four years later, the party returned to government with a landslide majority. Scholars have explained the dominance of the Conservative Party through an analysis of the ‘politics of support’ and the ‘politics of power’. This article applies that framework to Labour, focussing on how support was built in the run up to 2024. It examines the politics of support across the party organization, parliament and, most importantly, the electorate. I argue that Starmer’s bid to achieve electoral support relied on two main factors: a ‘decontamination’ strategy related to the party’s immediate past; and a cautious approach that minimized policy commitments and downplayed the role of ideology. The approach was electorally successful, but resulted in shallow support, gained in large part from removing reasons voters in target seats had previously not supported the party. The article concludes by discussing the challenges this strategy of support presents for the ‘politics of power’.
High Spatial Resolution and Dynamic OFDR-Based Method for Detecting Ship Structural Response
Authors: He Bo , Fu Xuelei , Gui Xin , Li Zhengying 
Published: February 2025

Abstract
Ships, as thin-walled structures, experience various structural responses at critical components and may even fail under sustained time-varying wave forces. Understanding the structural behaviors of key components during operation is essential for accurate ship safety assessments. The lack of an effective strain monitoring system that integrates both high spatial resolution and dynamic monitoring capabilities affects the timely detection of these structural responses. This paper presents a high spatial resolution dynamic strain monitoring system using optical frequency domain reflectometry (OFDR), achieving a system spatial resolution of 0.11 mm, a sensing spatial resolution of 20 mm, and a sampling frequency of 10 Hz. A box girder model of a river-sea-going ship is employed to simulate structural responses under wave-induced conditions. Simulation results validate the system's accuracy. By analyzing strain distribution and variation, this study explores the dynamic collapse behavior of structures under wave forces.
Energy transfer in laser-induced plasma generation on nano-aerosols
Authors: Wang Chen , Zhang Ying , Liu Tianye , He Delong , Cheng Xuemei , BAI Jinbo 
Published: February 2025

Abstract
We report on the investigation of laser-induced plasma generation mechanism in laser-aerosols interaction with dry Cu nano-aerosols of different sizes as the samples. The energy transfer mechanism is firstly analyzed based on the comparison of electron temperature between pure air and that containing aerosols, and the breakdown energy threshold for particles with respect to aerosol density. It is inferred that both laser-particle interaction and plasma-particle interaction exist in laser-induced plasma generation on nano-aerosols. And the plasma-particle interaction gets dominant for the cases with low aerosol density. In specific, the plasma plays dual roles in interaction with aerosols - atomization and excitation. According to the electron temperature drop for the case with aerosols compared with pure air, we roughly estimated the energy loss of plasma and found it is not enough to fully atomize the particles. On this basis, the smaller particles, which can absorb more energy because of the larger relative surface and more absorbing entities presenting in the plasma, are helpful to achieve higher LIBS signal intensity, electron temperature and density. This work is useful in understanding the mechanism of laser-aerosol interaction, which would be of importance in the wide applications of laser-induced plasma generation from aerosols including radiation generation, aerosol detection, dual-pulse LIBS technique.
Controlling plasma produced fluxes to liquid surfaces by acoustic structuring: Applications to plasma driven solution electrochemistry
Authors: Doyle Scott James , Dias Tiago C. , Meyer Mackenzie , Kushner Mark J 
Published: February 2025

Abstract
Plasmas interacting with liquid surfaces produce a complex interfacial layer where the local chemistry in the liquid is driven by fluxes from the gas phase of electrons, ions, photons, and neutral radicals. Typically, the liquid surface has at best mild curvature with the fluxes of impinging plasma species and applied electric field being nominally normal to the surface. With liquids such as water having a high dielectric constant, structuring of the liquid surface by producing a wavy surface enables local electric field enhancement due to polarization of the liquid, as well as producing regions of higher and lower advective gas flow across the surface. This structuring (or waviness) can naturally occur or can be achieved by mechanical agitation such as with acoustic transducers. Electric field enhancement at the peaks of the waves of the liquid produces local increases in sources of reactive species and incident plasma fluxes which may be advantageous for plasma driven solution electrochemistry (PDSE) applications. In this paper, results are discussed from a computational investigation of pulsed atmospheric pressure plasma jets onto structured water solutions containing AgNO3 as may be used in PDSE for silver nanoparticle formation. The solution surface consists of standing wave patterns having wavelength and wave depth of hundreds of microns to 1 mm. The potential for structured liquid surface to facilitate spatially differentiated chemical selectivity and enhance nanoparticle synthesis in the context of PDSE is discussed.&#xD;
Ultra-broadband small-size polarization splitter based on gold-coated dual-core photonic crystal fiber
Authors: Zou Hui , Wang Shizheng , Du Yuhang , Zhang Ruizhe 
Published: February 2025

Abstract
In this paper, an ultrashort polarization beam splitter (PBS) for ortho-hexagonal dual-core photonic crystal fiber (RS-DC-PCF) based on a gold-coated film with central holes is proposed. In RS-DC-PCF, air holes are arranged in the ortho-hexagonal lattice, and elliptical structures and metal coatings are introduced to enhance birefringence. The coupling and propagation characteristics of the transmitted light with the PBS are investigated using the full vector finite element method, and the effects of different structural parameters on the coupling lengths (CLx and CLy), coupling length ratios (CLR), and extinction ratios (ER) in the x-polarization and y-polarization directions, as well as the effects of the preparation tolerances on the device length and the thickness of the gold film, are explored. The simulation results show that the optimized DC-PCF PBS has an ultrashort splitting length of 16.67 µm, an ER higher than 20 dB over the wavelength range of 0.94-1.97 µm, and a bandwidth of up to 1030 nm, which fully covers the E + S + C + L + U communication band. With ultra-short device length, ultra-wide operating bandwidth and good preparation tolerance, this polarization beam splitter has great potential for applications in optical fiber communications.
Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data
Authors: Conzinu P. , Fanizza G. , Gasperini M. , Pavone E. , Tedesco L. , Veneziano G. 
Published: February 2025

Abstract
We discuss a recently proposed
fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav)
in terms of a relic stochastic background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. We show that such interpretation cannot be reconciled with a phenomenologically viable minimal version of such scenario, while it can be allowed if one considers an equally viable but generalised, non-minimal version of pre-big bang evolution. Maintaining the S-duality symmetry throughout the high-curvature string phase is possible although somewhat disfavoured. The implications of this non-minimal scenario for the power spectrum of curvature perturbations are also briefly discussed.
Validation of Photovoltaic Mathematical Model Integrated with Grid-Connected Microinverter through online Mechanism
Authors: Erixno O , Ramadhani F , Rivai A , Silalahi DK , Yustika L M , Rahim N Abd 
Published: February 2025

Abstract
Photovoltaic as green energy source has widely implemented in the world to push down the use of fossil fuel. To realize the photovoltaic into simulation, a proper model of photovoltaic should be validated with a real device. This paper provides a validation of photovoltaic model through online mechanism, meaning that the photovoltaic is connected to a national grid with an intermediary a grid-connected microinverter. The validation including real experiment and simulation was applied for ten days measurement with same solar irradiance and temperature profiles. The result showed that average error between model and real system for the electricity generation was on the average of 1.7%.
Prediction of PM2.5 and CO2 concentrations using the PCA-LightGBM method in Bandung, Indonesia
Authors: Adiwidya A S , Romadhony A , Chandra I , Sukmawati A N D , Sholihah H M , Islamiah D U , Rinaldi A 
Published: February 2025

Abstract
Poor air quality due to large amounts of human activity shows the need to increase public awareness and alertness by building a system predicting future pollutant concentrations. This research creates a prediction system using the LightGBM algorithm for PM2.5 and CO2 pollutant parameters with an additional parameter reduction method using PCA to increase prediction accuracy. The number of valid datasets is 918 for each of the five parameters at each measurement station, with data gaps filled using median values so that they can be used for predictions. The prediction results show that the best accuracy for PM2.5 is at the Deli station, which uses PCA with a MAPE of 21.5%, and for CO2, it is achieved at the Deli station without PCA with a MAPE of 4.8%. Based on its accuracy, PCA is less suitable if there are outliers in the dataset, but PCA is ideal for homogeneous datasets. Overall, the prediction results based on accuracy for PM2.5 are in the feasible category, and for CO2, they are in the accurate and very accurate category. To optimize prediction results, especially in the long term, it is necessary to retrain with a complete and up-to-date dataset to better suit air conditions.
Enhancing Agricultural Monitoring: Integrating ANP with QFD for the Design of a Smart Agriculture Tracking System
Authors: Soesanto Rayinda Pramuditya , Akbar Resha 
Published: February 2025

Abstract
Monitoring agriculture over large areas is crucial for improving crop management practices and maximizing yields. On the other hand, current technologies continue to fail at high-level integration of user needs and technical capabilities, resulting in more complexity and dissatisfaction on the user’s end. The study fills this gap by offering a Smart Agriculture Tracking System framework based on QFD and ANP. This process includes evaluating consumer needs via surveys and interviews, determining technical characteristics, and developing a House of Quality (HoQ) matrix. Weighted ANP analysis was performed to prioritize these needs, and the results suggest that accuracy in sensor readings, reliability in scheduling notifications, and convenience of use are the top priority for users. The study demonstrates that the proposed architecture removes constraints for other similar systems by boosting functionality and usability. In simple terms, the Smart Agriculture Tracking System delivers practical improvements in the range of agricultural monitoring by aligning user needs with relevant technical characteristics, which impacts the way crops are handled, and productivity is increased.
Numerical Study of the Effect of Damper Opening Angle and Flue Gas Temperature on Temperature Distribution in Heat Recovery Steam Generator (HRSG)
Authors: Majid M R , Prabowo  
Published: February 2025

Abstract
Combined Cycle Gas Turbine (CCGT) utilises the hot flue gas from the gas turbine to produce steam in the Heat Recovery Steam Generator (HRSG). The steam from the HRSG is then used to generate electricity in the steam turbine. At PLTGU Tanjung Uncang Batam, the exhaust gas temperature when the damper is open must be below 400°C. However, the turbine gas with an initial load of 5 MW has an exhaust gas temperature of 560°C - 580°C. It is necessary to remove the turbine gas load or Full Speed No Load (FSNL) to reduce the inlet temperature of the turbine gas. The analysis was conducted using Computational Fluid Dynamics (CFD) with ANSYS Fluent 2020 software. The variations used are the diverter damper angle values of 51°, 68°, and 90° combined with inlet temperatures of 400°C and 580°C. HRSG simulation results, velocity, and temperature contours show that the flue gas is not evenly distributed. The turbine flue gas is only spread along 4 - 12 m. Apart from that, from the results of calculations based on operation conditions, at a flue gas temperature of 580°C, the steam flow rate affects the tube wall temperature. Analysis shows that at a steam flow rate of 0.0576 t/h, the tube wall temperature can increase to 541.84°C, which causes the material strength limit to decrease significantly to 143.94 MPa. The ideal steam flow rate is 2.484 t/h, at which the material strength limits remain almost the same as the current operating conditions (400°C). Thus, if the steam flow rate is 2.484 t/h, which is safe for the tube temperature, there is potential for cost savings. Savings from using demineralized water reach IDR 24,708,240 per start up process.
Risk Mitigation: Evaluation of Rig X, Rig Y, and Rig Z Performance by Analyzing Non-Productive Time on Drilling Activities in Field “A”
Authors: Ariyon M , Hilmy D R 
Published: February 2025

Abstract
The study examined the non-productive time (NPT) of drilling activities on rigs X, Y, and Z in field A. It utilized the pareto chart approach to identify the specific type of NPT that was the primary issue during the drilling operation. Moreover, seeking methods to rectify and enhance the efficiency of X, Y, and Z rigs in carrying out drilling operations. According to the conducted research, the operational performance of rigs X, Y, and Z may be characterized by their work performance percentages, which are 90%, 92%, and 85% respectively, in completing drilling activities. The primary factors contributing to non-productive time (NPT) on rig X are rig maintenance and drilling issues, while rigs Y and Z experience NPT due to maintenance activities and unforeseen circumstances. To classify the NPT repair rig, it is necessary to perform preventative maintenance, inspect vital components, and replace any spare parts with authentic replacements. Unmanageable categorization involving the installation of matting boards near wellpads and the incorporation of mobile fleets. To effectively categorize NPT hole issues, it is necessary to optimize the rate of penetration (ROP), ensure the mud filters are not excessively thick, and prioritize thorough hole cleaning.
Feasibility study of a wind power plant for East Kalimantan
Authors: Clarabell M , Aprillia B S 
Published: February 2025

Abstract
According to the National Energy General Plan (RUEN) 2017 and National Energy Policy (KEN) 2014 issued by the National Energy Government, the use of Variable Renewable Energy (VRE) is expected to reach 31% by 2030. However, until 2019 the renewable energy mix in national energy only reached 9.1%. Even though the wind potential in East Kalimantan or East Borneo can be exploited by considering the supply of the wind using the Wind Turbine Generation and helping to fulfil the electricity needs. Based on the feasibility study, the development was obtained at IDR 17,056 billion per year over 25 years of operation. Meanwhile, the payback period is achieved for around 6.4 years of operation making the project feasible to be implemented. This project is based on the needs of one household that consumed around 5,116 Watt for everyday electricity consumption.
Numerical Study of Conventional Oscillating Water Column and Oscillating Water Column Using Helmholtz Resonator on Non-Linear Wave Input with Sloshing Characteristics
Authors: Kurniadi S , Sutardi  
Published: February 2025

Abstract
One of the latest OWC concepts that is expected to improve OWC performance and lessen the sloshing phenomenon is the Helmholtz resonator OWC. This study uses the Reynold Averaged Navier-Stokes (RANS) based CFD method with the k-ω SST turbulence model. 2D modeling is performed under transient conditions by applying the Volume of Fluid (VoF) technique to model the sloshing phenomenon in the OWC. According to the simulation result on input waves with sloshing characteristics (T = 1.08 s, H = 0.13 m, H/L = 0.073) the Helmholtz resonator OWC (Sc
= 0.05 m, e = 0.01 m, e = 0.05 m) produces better performance with ξ by 17%, Cr
by 7% and is able to prevent energy loss (Cd
) up to 9.4% compared to the conventional OWC (Sc
= 0.05 m, e = 0.05 m, e = 0.01 m). From the results of the OWC airspace velocity contours, it is found that the conventional OWC has a larger and faster vortex shedding than the Helmholtz resonator OWC. In this case, the Helmholtz resonator OWC in waves with sloshing characteristics can reduce the effect of turbulence-shedding vortex caused by waves with sloshing characteristics much better than the OWC.
Design of a LifePo4 Battery Pack 21 A for Electric Motorcycle
Authors: Kusumah S S , Zahran R , Raharjo J 
Published: February 2025

Abstract
Currently, Indonesia has implemented Presidential Regulation Number 55 of 2019 in an effort to accelerate the Battery-Based Electric Motor Vehicle Program. However, currently there are no voltage standards and battery pack communication systems used in Indonesia. Meanwhile, 72-volt battery packs with a capacity of 20 Ah are widely used because they have superior mileage even though the price of replacing lithium-ion battery cells is more expensive than LiFePo4 battery cells. Therefore, this research aims to design a LifePo4 battery pack with specifications of 72 volts with a capacity of 21 Ah. Based on dyno tests, results show that the battery can produce up to 11.51 HP of power with a maximum speed of 86 km/hour.
Electrochemical Detection of Cu Based on ZnO/PVA Nanocomposites and Doped by Cellulose Nanocrystals
Authors: Ismardi A , Fathona I W , Soegiarto D , Maulida S , Putri F A , Fariz B N , Prihadni I W 
Published: February 2025

Abstract
River water must meet environmental and health standards for social uses such as drinking, bathing, agriculture, and sanitation. However, many rivers are contaminated with hazardous substances like copper (Cu), which can be harmful in excess. This study aims to detect Cu in water samples using a Glassy Carbon Electrode (GCE) modified with Zinc Oxide (ZnO), Polyvinyl Alcohol (PVA), and doped with Cellulose Nanocrystals (CNC). ZnO was selected for its chemical stability, wide energy band gap, and exciton binding energy. PVA, a conductive polymer with hydroxyl groups, was used to enhance the surface area, while CNC increased heavy metal adsorption. The ZnO/PVA/CNC nanocomposite was synthesized via the hydrothermal method and characterized using Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS). Electrochemical properties were tested with Cyclic Voltammetry (CV) and Square Wave Voltammetry (SWV) using a Corrtest potentiostat. The nanocomposite was applied as a thin film to modify the working electrode in GCE measurements. CV results showed a limit of detection (LOD) of 4.12 ppm and a coefficient of determination (R2) of 0.98758, while SWV measurements produced an LOD of 2.52 ppm and an R2 of 0.81282. These findings demonstrate the potential of ZnO/PVA/CNC-modified electrodes for detecting Cu in water samples.
Vehicle Counting and Classification in Varying Traffic Conditions using Faster R-CNN
Authors: Setiyono Budi , Wijaya Ridho Nur Rohman , Sulistyaningrum Dwi Ratna , Sanjoyo Bandung Arry , Octavia Rumia 
Published: February 2025

Abstract
Traffic congestion is a persistent problem requiring efficient management solutions. A Traffic Management System (TMS) has been introduced to mitigate traffic congestion due to scientific and technological advancements. One of the primary problems in TMS is accurately identifying and quantifying moving vehicles, especially for complex data, such as one-way traffic flow videos. To address these problems, we propose enforcing the Faster R-CNN model. We systematize it in three main steps. The first step is data preprocessing, which converts the video into frames and improves the image quality. Then, we created a TMS with Faster R-CNN. Finally, the classification and counting of moving vehicles. There are five classes of vehicles: car, bus, truck, motorbike, and bicycle. Each vehicle was identified as having either moderate or heavy traffic flow. Based on the experimental results, we obtained the highest average counting and classification accuracy of 87.89% and 93.18%, respectively. Hence, our results can be used as a solid baseline for further TMS development and practical applications.