bluuebunny/crossref_metadata_2025_split huggingface dataset:
500 V breakdown voltage in β‐Ga2O3 laterally diffused metal‐oxide‐semiconductor field‐effect transistor with 108 MW/cm2 power figure of merit
Authors: Abedi Rik Nesa , Orouji Ali. A. , Madadi Dariush 
Published: May 2023

AbstractThe authors’ present a silicon‐on‐insulator (SOI) laterally diffused metal‐oxide‐semiconductor field‐effect transistor (LDMOSFET) with β‐Ga2O3 , which is a large bandgap semiconductor (β‐LDMOSFET), for increasing breakdown voltage (VBR) and power figure of merit. The fundamental purpose is to use a β‐Ga2O3 semiconductor instead of silicon material due to its large breakdown field. The characteristics of β‐LDMOSFET are analysed to those of standard LDMOSFET, such as VBR, ON‐resistance (RON), power figure of merit (PFOM), and radio frequency (RF) performances. The effects of RF, such as gate‐drain capacitance (CGD), gate‐source capacitance (CGS), transit frequency (fT), and maximum frequency of oscillation (fMAX) have been investigated. The β‐LDMOSFET structure outperforms performance in the VBR by increasing it to 500 versus 84.4 V in standard LDMOSFET design. The suggested β‐LDMOSFET has RON ~ 2.3 mΩ.cm−2 and increased the PFOM (VBR2/RON) to 108.6 MW/cm2. All the simulations are done with TCAD and simulation models are calibrated with the experimental data.
Does Antenatal MgSO4 Administration to the Mother in the Event of Imminent Premature Birth Reduce the Occurrence of Infantile Cerebral Palsy in the Child? –
An Umbrella Review
Authors: Binder Charlotte , Schmid Pauline , Abele Harald , Graf Joachim 
Published: May 2023

Abstract
Introduction Premature births have a significantly increased risk of developing cerebral palsy. This clinical picture involves great restrictions and impairments in the lives of
the children and their families. Its prevention is therefore of great importance. One method of neuroprotection to reduce the rate of infantile cerebral palsy is the antenatal
administration of magnesium sulfate to the mother. The aim of this paper is to present the current state of research of existing reviews and meta-analyses on the topic and to review the
evidence for this intervention.
Material and Methods A literature search was conducted within the framework of an umbrella review in the electronic database PubMed in February 2022 to identify all relevant
publications on the topic. The search was structured using the PRISMA statement. The important methodological characteristics and the results of the studies were then extracted. In
addition, a quality assessment of the studies was performed using the AMSTAR score.
Results Two systematic reviews with meta-analysis, one systematic review, and one individual participant data meta-analysis were included in this study. The total number of
subjects was n = 6178. The publications conclude that the antenatal administration of magnesium sulfate to the mother significantly reduces the risk of cerebral palsy in preterm infants.
Due to the high quality of 3 of the 4 studies, a high level of evidence can be assumed.
Conclusion The evidence for antenatal magnesium sulfate administration for the prophylaxis of cerebral palsy in preterm infants is high. However, further research is needed to
determine which doses of magnesium and up to which gestational age the administration is useful.
The Use of Intracardiac Echocardiography in Transjugular Intrahepatic Portosystemic Shunt Procedure
Authors: Bayona Molano Maria del Pilar , Rice Samuel 
Published: May 2023

AbstractTransjugular intrahepatic portosystemic shunt (TIPS) is a complex intervention with a steep learning curve that requires centers of expertise to improve technical success and reduce complications. Portal venous access is the most challenging step of the procedure and requires planning and image guidance strategies to prevent vascular or bile duct injury and further complications. Intracardiac echocardiography (ICE) has been reported to be a safe and accurate tool that provides images of the portal vein anatomy in real time. The use of ICE has become the standard of care in several centers. It is now frequently used to target the portal vein in complex TIPS procedures. This review article describes some technical aspects and indications of ICE-guided TIPS.
Smaller Diameter and Adjustable Diameter Transjugular Intrahepatic Portosystemic Shunts
Authors: Gupta Aakash N. , Sze Daniel Y. , Rigas Diamanto Amanda 
Published: May 2023

AbstractComplications of overshunting, including hepatic encephalopathy and hepatic insufficiency, remain prevalent following transjugular intrahepatic portosystemic shunt (TIPS) creation. Smaller diameter TIPS may reduce the risk of overshunting, but the use of smaller stents must be weighed against the risk of undershunting and persistent or recurrent hemorrhage, ascites, and other complications of portal hypertension. This article explores the question of optimal shunt diameter by examining outcomes for smaller diameter TIPS stent-grafts (<10 mm), underdilated stent-grafts, and variable diameter stent-grafts.
Possible Triggers of Supraventricular Tachycardia in a Toddler Rescued from a Garage Fire: A Case Report
Authors: Shaw Susanna , Rafaat Karim , Frugoni Brian 
Published: May 2023

AbstractWe describe the case of a previously healthy toddler with the finding of supraventricular tachycardia after being rescued from a garage fire. The patient's initial presentation was concerning for inhalational injury and a 2% total body surface area burn to the forehead. Additionally, the patient was noted to be extremely agitated in the trauma bay. Given the patient's agitation and the mysterious circumstances surrounding the fire, a urine toxicology was performed shortly after admission and was positive for cocaine. Passive cocaine inhalation, possibly during the fire, is a likely explanation for the child's arrhythmia.
UK mutual funds: performance persistence and portfolio size
Authors: Cuthbertson Keith , Nitzsche Dirk , O’Sullivan Niall 
Published: May 2023

Abstract
We re-examine performance persistence amongst UK mutual funds. Specifically, we investigate performance persistence amongst small portfolios of past high-performing funds. In contrast to the more common analysis of decile portfolios of funds, we focus on persistence in the more extreme positive tail of the cross section of fund performance. This paper contributes to the smaller literature on UK rather than US mutual fund performance. We investigate fund persistence based on practitioner index models as well as academic factor models, focusing on small portfolios of funds using inference based on nonparametric persistence test statistics as well as conventional t tests. We provide strong evidence of positive persistence amongst small-size portfolios of (past) high-performing funds that is robust to alternative formation and holding periods and alternative performance models. We also document some sensitivity in inferences on positive persistence when using nonparametric versus conventional tests.
International taxation and the organizational form of foreign direct investment
Authors: Amberger Harald J. , Kohlhase Saskia 
Published: May 2023

AbstractWe investigate the relation between international taxation and the organizational form of foreign direct investment (FDI). Using micro-level data on inbound FDI relations in Germany, we find that a higher tax burden on income earned in a corporate subsidiary increases the probability that a multinational corporation (MNC) conducts foreign investment through a non-corporate flow-through. This effect is economically meaningful and varies with the relative importance of tax-motivated income shifting, a subsidiary’s non-tax benefits of limited liability and legal independence, and an MNC’s local knowledge. Moreover, we examine potential real effects of organizational form choices and document that affiliates established as flow-throughs exhibit a lower loss propensity and are less profitable than affiliates established as subsidiaries. Taken together, our findings inform policy makers about the potential response of MNCs to tax-law changes and suggest that the chosen organizational form can shape the future characteristics of investments abroad.
Generating ultrashort visible light pulses based on multidimensional solitary states in gas-filled hollow core fiber
Authors: Kumar Mayank , Arshadipirlar Maghsoud , Safaei Reza , Ibrahim Heide , Légaré François 
Published: May 2023

Multidimensional solitary states (MDSS) are self-sustaining light wave packets confined in multiple dimensions in multimode fibers. In this work, we experimentally demonstrate the generation of MDSS, driven by a few hundreds of femtoseconds (fs) of long frequency doubled pulses from a Titanium:Sapphire chirped pulsed amplifier in a nitrous oxide-filled hollow core fiber (HCF). The MDSS output, resulting from intermodal interactions in a Raman-active gas-filled large core diameter HCF, features a broadband, red-shifted spectrum in the visible spectral region with a characteristic negative quadratic spectral phase. Therefore, the output with broadband spectra and negative chirp results in the generation of sub-30 fs pulses upon propagation through glass windows and a spectral filter. Backed with experimental observations and multidimensional simulations, we demonstrate that the sign of the frequency chirp of input pulses influences the spectral broadening in the HCF in the high gas-dispersion regime. We observed that the MDSS red-shifted pulses have a clean spatial profile. Therefore, the experimental requirements on the input beam size and quality to achieve a clean MDSS beam profile at the output of large core HCFs can be relaxed. Hence, this work extends the validation of the MDSS phenomenon toward the ultraviolet-visible region of the electromagnetic spectrum, thus providing an alternate source with a clean spatial beam profile for various applications in the field of ultrafast spectroscopy.
Spectrally tunable ultrashort monochromatized extreme ultraviolet pulses at 100 kHz
Authors: Csizmadia Tamás , Filus Zoltán , Grósz Tímea , Ye Peng , Gulyás Oldal Lénárd , De Marco Massimo , Jójárt Péter , Seres Imre , Bengery Zsolt , Gilicze Barnabás , Lucchini Matteo , Nisoli Mauro , Frassetto Fabio , Samparisi Fabio , Poletto Luca , Varjú Katalin , Kahaly Subhendu , Major Balázs 
Published: May 2023

We present the experimental realization of spectrally tunable, ultrashort, quasi-monochromatic extreme ultraviolet (XUV) pulses generated at 100 kHz repetition rate in a user-oriented gas high harmonic generation beamline of the Extreme Light Infrastructure—Attosecond Light Pulse Source facility. Versatile spectral and temporal shaping of the XUV pulses is accomplished with a double-grating, time-delay compensated monochromator accommodating the two composing stages in a novel, asymmetrical geometry. This configuration supports the achievement of high monochromatic XUV flux (2.8 ± 0.9 × 1010 photons/s at 39.7 eV selected with 700 meV full width at half maximum bandwidth) combined with ultrashort pulse duration (4.0 ± 0.2 fs using 12.1 ± 0.6 fs driving pulses) and small spot size (sub-100 µm). Focusability, spectral bandwidth, and overall photon flux of the produced radiation were investigated, covering a wide range of instrumental configurations. Moreover, complete temporal (intensity and phase) characterization of the few-femtosecond monochromatic XUV pulses—a goal that is difficult to achieve by conventional reconstruction techniques—has been realized using a ptychographic algorithm on experimentally recorded XUV-infrared pump–probe traces. The presented results contribute to in situ, time-resolved experiments, accessing direct information on the electronic structure dynamics of novel target materials.
Research on the inverse kinematic algorithm of the robot arm of the minecart
Authors: Jiang Zhihong , Yu Zhijian , Zhang Xiaoyang 
Published: May 2023

Abstract
A reverse kinematics solution algorithm for the robot arm of the minecart is proposed based on the structure and motion characteristics of the robot arm, the geometric method is combined with the algebra method, and the trajectory of each joint point on the mechanical arm is calculated inversely by using the motion trajectory of the roller on the mining wheel to reverse-calculate the trajectory of each joint point on the mechanical arm, and the joint angle of the mechanical arm is obtained according to the trajectory of each joint point. The results are compared and analyzed through the Robots Toolbox toolbox in Matlab to verify the correctness and validity of the inverse calculation results. It lays a foundation for future research on key issues such as path planning and trajectory tracking control of the robot arm of the minecart.
Numerical Simulation on Water Jet Oil Cleaning inside Pressure Gauges
Authors: Ye Jiaxing 
Published: May 2023

Abstract
Pressure measuring instruments in the process of use, the accumulation of oil and dust will produce irreversible harm to the pressure instrument. High-pressure water jet cleaning technology to clean the oil can clean off most of the dirt. Now, based on the VOF multiphase flow model, the k-ε turbulence model is simulated for the jet flow rate, and the efficiency of oil flushing by different velocities and different frequency jets is quantitatively studied by numerical simulation for different working conditions. With the increase in speed, the higher the efficiency of oil cleaning; when the pulsating jet input is used, the frequency and cleaning efficiency are not proportional. The pulsating jet has more advantages in cleaning efficiency compared to the constant flow.
Numerical simulation of flow velocity measurement in mono/cross sound roads by time difference method
Authors: Ye Jiaxing 
Published: May 2023

Abstract
This paper mainly focuses on the numerical simulation research of the time-difference method ultrasonic flowmeter. The time-difference method is used to measure the flow rate of fluid in the main flow pipeline, and the calculation time-difference and numerical simulation time-difference are compared under several conditions of mono-and cross-sound circuit respectively, which verifies the reliability of numerical simulation time-difference. The comparison between the time difference measured by mono and cross channels verifies that increasing the measurement sound path can improve the measurement accuracy. At the same time, the measurement accuracy of mono-path and cross-path under different conditions is compared, and it is found that the cross-path is more suitable for the measurement of fast flow rate, and its measurement accuracy increases with the increase of flow rate.
Study on Temperature Measurement Model of Rare Earth Metal Electrolysis Based on Infrared Image
Authors: Zang XiaoLong , Tao LiKe , Qin Yun , Hu Zhenguang 
Published: May 2023

Abstract
The temperature of rare earth electrolysis plays an important role in the process of electrolysis control. It is the main parameter to control the efficiency of electrolysis. In production practice, most of the process parameters are controlled by the artificial thermocouple temperature measurement method. This extensive technical management method greatly affects the accuracy of production control. And the traditional thermocouple temperature measurement is artificial and slow, not timely, short life, and has other issues. Therefore, it is extremely urgent to explore a continuous and safe surface temperature measurement method to achieve precise control of process parameters. Therefore, based on the principle of infrared temperature measurement, this paper introduces the theory of infrared temperature measurement, uses Matlab software to extract the average gray value of the infrared image, and obtains the infrared temperature measurement model by least square method and bp neural network for temperature and gray fitting curve. At the same time, the experimental data are measured, and the model is verified. This method provides a reference for online temperature measurement of electrolytic molten metal.
Modeling on flexible variable topology mechanism based on the Kane method
Authors: Liu Peng , Fan Fengchen , Geng Ruihai , Gao Zhihui 
Published: May 2023

Abstract
In recent years, with the development of space science and technology and the deepening of space exploration, a new type of institution with variable topology, variable topology, with its flexibility to adapt to the environment and diversity of tasks, has become an important development direction of multi-purpose and highly integrated complex space institutions in our country. Therefore, it is very important to study the dynamic problems of this kind of flexible variable topology mechanism and explore the methods and means to improve the dynamic performance, which meets the major requirements of the development of Chinese space science and technology. In this paper, a rigid-flexible coupling manipulator system that can realize the conversion of single and two degrees of freedom is studied. The full-structure nonlinear dynamics model of the manipulator is established by using the Kane method.
Study of Fractional Order PI DC-DC Converter Based on Dual Closed-loop Control
Authors: Wu Meimei , Ma Hailong , Wei Qingjin , Wang Tonglin , Chen Yanyan 
Published: May 2023

Abstract
In this paper, the dual closed-loop control strategy with fractional-order PI is applied to the field of the DC-DC converter, which effectively improves the dynamic performance and static performance of the output voltage of the power electronic DC chopper converter. The open-loop transfer function of the Boost converter is obtained by modeling and analyzing the operating principle and small-signal model of the Boost converter, and the fractional-order PI parameters of the double closed-loop control are obtained by combining the frequency-domain analysis design method of control theory. The Simulink simulation model is built, and the fractional-order PI control model is compared and analyzed with the single-voltage loop control and the integer-order PI control model. The results show that the fractional-order PI-controlled Boost converter has a faster response and stronger anti-interference capability, which effectively improves the dynamic performance and static performance index of the DC-DC converter and provides a theoretical basis for the research of dual closed-loop control strategy of the DC-DC converter.
Mechanical optimization design and experimental analysis of mine tricone bit nozzle
Authors: Lei Ming , Peng Fang , Zheng Junyuan , Wu Ying , Wang Weihua , Kong Xiangrui , Qian Zhiliang 
Published: May 2023

Abstract
This paper explores the optimal design of cone bit nozzle diameter and a comparative analysis of cone tooth stress. When drilling the tricone bit, direct contact between the roller casing and the wellbore is prone to wear. The fluid emitted from the cone bit nozzle helps reduce friction and reduce temperature. In this paper, a three-dimensional model is established using the software, and then the surface shear stress of the cone bit under the action of the flow field is simulated. The larger the shear stress is, the more serious the wear is. The simulation results show that when the nozzle diameter is φ17mm, the maximum shear stress on the surface of the roller is 6640Pa. When the nozzle diameter is φ22mm, the maximum shear stress on the surface of the roller is 3040Pa, which is 50% lower than that of the nozzle diameter φ17mm. Through the analysis, improving the wear of the cone housing of the drill bit, the diameter of the nozzle of the 9SRA545R tricone bit is changed from φ17mm to φ22mm, which can effectively reduce the erosion degree of the rock debris on the surface of the cone, to improve the wear degree of the cone housing.
Research and improvement of SPS spark plasma sintering equipment
Authors: Chen Biyang , Peng Zhiguo , Tang Tengfei , Yue Gao , Zhang Weijia 
Published: May 2023

Abstract
Through the functional disassembly study of the pressurization system, vacuum and atmosphere control system, water cooling system and control system of the SPS spark plasma equipment, the problems in the actual production process and the corresponding improvements of the spark plasma sintering (SPS) equipment are also discussed. The shortcomings and its development directions are also proposed to provide sufficient data support for the subsequent research.
A dynamic failure mode and effect analysis (FMEA) method for CNC machine tool in service
Authors: Jiang Shixin , Liu Zhenguo , Chen Jieyu 
Published: May 2023

AbstractTo solve the problems such as uncertain evaluation information, high dependence on experts, and no consideration of the degradation of machine operating performance to failure risk in the practical application of FMEA in CNC machine tool operation and maintenance, a dynamic failure mode and effect analysis (FMEA) method for CNC machine tool in service is proposed, operation and maintenance data is introduced to the traditional failure risk analysis, which makes semantics criteria and data-driven method are systematically integrated, resulting in better performance of quantitative assessment and risk ranking of dynamic fault risk. Afterward, the fault classification and maintenance strategy of the CNC machine tool based on risk priority number (RPN) is proposed, which provides decision support for efficient operation and maintenance of the CNC machine tool. Finally, a machining center is taken as an example to verify the feasibility and effectiveness of the method.
Study on the Transient Forced Vibration Characteristics of a Radial Turbine Impeller
Authors: Huang Zhi , Ma Chaochen 
Published: May 2023

Abstract
This work focuses on transient forced vibration response characteristics of a radial turbine passing through the resonant frequency at different speeds. The transient structure analysis based on the modal superposition method is used to calculate the vibration response of the impeller, and the frequency sweep tests are carried out to verify the calculation results. The experimental results are in good agreement with the simulation results. The impeller response curve becomes steeper as the frequency sweep time increases; however, the elastic potential energy of the blade is dissipated more by the structural damping at 13000 Hz. The response waveform of frequency sweep time 10s is close to the situation of 60s. When the frequency sweep takes the 60s, the excitation energy is input to the impeller, and the damping dissipation of the system reaches a state close to equilibrium.