bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on pitting behavior of HDR duplex stainless steel at different film-forming potentials
Authors: Lin Yufeng , Li Zhuying , Liu Xin , Zhang Xiaodong , Chi Junhan 
Published: March 2024

Abstract
The influence of external potentials on the electrochemical corrosion characteristics and pitting resistance of Low Carbon High Chromium (H), Duplex (D), Corrosion Resistant (R) duplex stainless steel after film formation was investigated by techniques such as dynamic potential scanning, constant potential polarization, Electrochemical Impedance Spectroscopy (EIS), conjunction with Scanning Electron Microscope (SEM) and Energy Dispersive Spectroscopy (EDS) analysis, were used to examine the effects of passivation potential and over-passivation potential on the pitting resistance of HDR duplex stainless steel, compared with naturally film-formed HDR corrosion resistance. Results show that in a 3.5% NaCl solution, the passivation range of HDR duplex stainless steel is 0~1.0 V, with certain current fluctuation appearing in the unstable pitting region around 1.0 V. As the film formation potential increases, the impedance first increases then decreases, and the carrier concentration first decreases then increases. At 0.9 V, the impedance is at its maximum, the carrier concentration is at its minimum, and the corrosion resistance is the best; at 1.2 V, the impedance is at its minimum, the carrier concentration is at its maximum, and the corrosion resistance is the worst; the natural film formation sample falls between 0.1 V and 0.7 V. After pitting tests, pitting mainly occurs at the ferrite structure and its boundaries for the naturally film-formed and film-formed potentials below 1.0 V samples, but pitting mainly occurs at the austenite structure and its boundaries in the 1.2 V film-formed sample, indicating a reversal of corrosion in the structural pitting. The sample with the film formation potential of 0.1 V developed many small pits on the surface after pitting test, which is related to the oxidation of Mo.
First measurement of the (n,n′) reactions cross section in the 14 MeV regions using highly enriched 129,131Xe isotopes
Authors: Luo Junhua , Jiang Li , Tuo Fei , Liang Juncheng , He Long 
Published: March 2024

Abstract
In this study, the cross-sections of the 129Xe(n,n′)129mXe and 131Xe(n,n′)131mXe reactions were measured for the first time within the energy range 13.5–15.0 MeV based on the 27Al(n,α)24Na monitor reaction cross-section. The experiment employed high-purity, high-pressure, and highly enriched 129,131Xe isotope gas as the target sample. This study marks the first instance in which the measured cross-sections, corresponding correlation matrices, and associated uncertainties are provided. The TALYS-1.96 software was employed to obtain theoretical calculations, allowing for a comparison with experimental and evaluation results. The present study aids in understanding 129Xe(n,n′)129mXe and 131Xe(n,n′)131mXe cross-sections within 14 MeV regions, where the energy dependence exhibits relatively gradual changes and significant discrepancies between nuclear data libraries have been identified.
Research on vehicle battery data cleaning method based on OOA-VMD-ATGRU-GAN
Authors: Ding Delin , Sun Ning , Li Ai , Li ZiHan , Zhang Ying 
Published: March 2024

Abstract
Battery health monitoring is influenced by environmental and human factors, resulting in the presence of abnormal and missing values in the detection data. These issues compromise the accuracy of subsequent life prediction and fault diagnosis. To address this problem, we propose a deep learning-based method for cleaning battery anomalies and imputing missing data. Initially, we optimize the Variational Modal Decomposition method using the Osprey Optimization Algorithm to minimize the influence of continuous discharge processes on local anomaly detection. This process allows us to obtain the trend of the time series, and subsequently, we determine the anomalies by using the interquartile range after removing the trend components. The identified anomalies are then converted into missing values for further processing. Next, we fill in these missing values by constructing a Generative Adversarial Network. The generator structure of the network combines the attention mechanism with the Gated Recurrent Unit. We validate our approach using a real vehicle dataset and subsequently perform prediction on the cleaned dataset. Our results demonstrate that the subsequent Long Short-term Memory Networks and Gated Recurrent Unit prediction model improves the RMSE value by approximately 35% and the MAPE value by roughly 42%. Thus, our method effectively enhances the quality of the original data.
Axio-Chameleons: a novel string-friendly multi-field screening mechanism
Authors: Brax Philippe , Burgess C.P. , Quevedo F. 
Published: March 2024

Abstract
Scalar-tensor theories with the shift symmetries required by light scalars are well-explored modifications to GR. For these, two-derivative scalar self-interactions usually dominate at low energies and interestingly compete with the two-derivative metric interactions of GR itself. Although much effort has been invested in single scalars (on grounds of simplicity) these happen to have no two-derivative interactions, requiring such models to explore higher-derivative interactions (that usually would be less important at low-energies). This suggests multiple-scalar sigma models as well-motivated candidates for finding new phenomena in tests of gravity. We identify a new multi-field screening mechanism appropriate for two light scalar fields (an axion and a Brans-Dicke style dilaton) that relies on their mutual two-derivative interactions. We show how very weak axion-matter couplings can introduce axion gradients that can reduce the apparent coupling of the Brans-Dicke scalar to macroscopic matter sources. We further identify a relaxation mechanism that allows this reduction to be amplified to a suppression by the ratio of the axion gradient's length scale to the source's radius (similar in size to the suppression found in Chameleon models). Unlike some screening mechanisms our proposal is technically natural and works deep within the regime of control of the low-energy EFT. It uses only ingredients that commonly appear in the low-energy limit of string vacua and so is likely to have wider applications to models that admit UV completions. We briefly discuss phenomenological implications and challenges for this scenario, which suggests re-examination of decay loss bounds and the value of equivalence-principle tests for different-sized objects.
Analysis of the gluon distribution with next-to-leading order splitting function at small-x*
Authors: Chen 陈 Jingxuan 京萱 , Wang 王 Xiaopeng 晓鹏 , Cai 蔡 Yanbing 燕兵 , Chen 陈 Xurong 旭荣 , Wang 王 Qian 倩 
Published: March 2024

Abstract
An approximated solution for the gluon distribution from DGLAP evolution equations with the NLO splitting function in the small-x limit is presented. We first obtain simplified forms of the LO and NLO splitting functions in the small-x limit. With these approximated splitting functions, we obtain the analytical gluon distribution using the Mellin transform. The free parameters in the boundary conditions are obtained by fitting the CJ15 gluon distribution data. We find that the asymptotic behavior of the gluon distribution is consistent with the CJ15 data; however, the NLO results considering the "ladder" structure of gluon emission are slightly better than the LO results. These results indicate that the corrections from NLO have a significant influence on the behavior of the gluon distribution in the small-x region. In addition, we investigate the DGLAP evolution of the proton structure function using the analytical solution of the gluon distribution. The differential structure function reveals that our results have a similar tendency to the CJ15 data at small-x.
QCD sum rule study of J

P
= 1± exotic states with two heavy quarks in the molecular picture
Authors: Aliev T.M. , Bilmis S. , Savcı M. 
Published: March 2024

Abstract
In this study, the spectroscopic parameters of exotic molecular states composed of mesons containing two heavy quarks (scalar - axial and pseudoscalar - axial meson combinations) are investigated within the QCD sum rules. Our findings reveal that molecular states containing charm quarks do not form bound states, whereas states with b-quarks can form exotic molecular states. This observation has significant implications for understanding the structure of these exotic states.
BSN: Photometric Light Curve Analysis of Two Contact Binary Systems LS Del and V997 Cyg
Authors: Poro Atila , Tanriver Mehmet , Sarvari Elham , Zavvarei Shayan , Azarara Hossein , Corp Laurent , Baudart Sabrina , Ababafi Asma , Kahali Poor Nazanin , Zare Fariba , Bulut Ahmet , Keskin Ahmet 
Published: March 2024

Abstract
The light curve analyses and orbital period variations for two contact binary stars, LS Del and V997 Cyg, are presented in this work which was conducted in the frame of the Binary Systems of South and North project. Ground-based photometric observations were performed at two observatories in France. We used the Transiting Exoplanet Survey Satellite (TESS) data for extracting times of minima and light curve analysis of the target systems. The O − C diagram for both systems displays a parabolic trend. LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt = 7.20 × 10−08 days yr−1 and dP/dt = 2.54 × 10−08 days yr−1, respectively. Therefore, it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt = –1.96 × 10−7
M
⊙ yr−1 for the LS Del system, and dM/dt =–3.83 × 10−7
M
⊙ yr−1 for V997 Cyg. The parameters of a third possible object in the system are also considered. The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves. The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima. The mass ratio, fill-out factor, and star temperature all indicate that both systems are contact binary types in this investigation. Two methods were applied to estimate the absolute parameters of the systems: one method relied on the parallax of Gaia DR3, and the other used a P − M relationship. The positions of the systems are also depicted on the M − L, M − R, q − L
ratio, and

log

M

tot

−

logJ

0

diagrams. We recommend that further observations and investigations be done on the existence of a fourth body in this system.
Summary of the 17th Asian International Conference on Fluid Machinery
Authors: Shouqi Yuan 
Published: March 2024

1. Background

The conference is a continuation of the preceding 16th conferences that have been held in the name of the Asian International Conference on Fluid Machinery (AICFM). It has developed from the fourth conference (1993) as an International Conference though the start was held in two countries of Japan and China. After that the conference was held in Seoul (1997), Johar Baru (2000), Fukuoka (2003), Yichang (2005), Jeju (2007), Kualalumpur (2009), Chennai (2011), and Yogyakarta (2013), Tokyo (2015), Zhenjiang (2017), Busan (2019) and Yokohama (2021). The Asian Fluid Machinery Committee (AFMC) was established during the 9th AICFM 2007 held in Jeju, Korea.
The conference is organized by AFMC and CSET. Participation of those who are relevant to every facet of fluid machinery, R&D will be encouraged.
List of Objectives, Scope, Record, Acknowledgement, Appendix A. Organization, Appendix B. Committee Members, Appendix C. AFMC AWARD 2023 Winners, Appendix D. Excellent Papers are available in this pdf.
Research on the influence of piping system on the fluid-dynamic noise of centrifugal pump
Authors: Mao Jieyun , Li Guidong , Zheng Yi , Zhang Jinfeng , Wang Peng 
Published: March 2024

Abstract
During the experimental research of the fluid-dynamic noise generated by a centrifugal pump, the accurate measurement of its acoustic characteristics can only be achieved when the pump is connected to a pipeline system. If the noise at a specific position of the centrifugal pump or its suction and discharge pipelines is used to directly describe the internal sound source characteristics of the pump during the test, there may be a broad difference in the experimental data depending on the specific system and the measuring position. Therefore, in order to verify the influence of different piping systems on the acoustic characteristics at a certain position of the inlet and outlet pipeline of the centrifugal pump, three different discharge pipeline schemes of the piping system were set up in this study. Meanwhile, this study solved the scattering matrix of a centrifugal pump using experimental methods. This method can be used independently of the testing system to describe the transmission and reflection characteristics at the ports of a centrifugal pump, and accurately solve the acoustic characteristics of the pump itself in future research.
Effect of reduced diameter pipeline and impeller position on the performance of reactor coolant pump
Authors: Su Haonan , Chen Huazheng , Zhu Rongsheng , Fu Qiang 
Published: March 2024

Abstract
In the reactor coolant pump experiments, there are cases where different impellers are replaced on the same volute for experiments, but due to the different diameter of the impeller inlet, there will be a sudden expansion between the inlet pipeline and the impeller inlet, resulting in a decrease in the efficiency of the pump. In order to solve this problem, a scheme of using an inlet pipe with a reduced diameter structure and changing the position of the impeller was proposed, and based on the three-dimensional incompressible Reynolds N-S equation, the reactor coolant pump device was numerically simulated by CFD software. The data simulation results of the reduced diameter structure, straight pipe flow field and changing the position of the impeller were compared with the model experiments, and the reliability of the calculation results was verified. The results show that the inlet pipe with reduced diameter structure and the method of changing the position of the impeller can effectively solve the problem of efficiency decline caused by the sudden expansion of the flow channel.
Effect of sand diameter on the performance of annular jet pumps
Authors: Liu Wenhui , Lai Xinjie , Zhu Chenbing , Zhou Qiwei , Yang Xuelong 
Published: March 2024

Abstract
For the current problem of low efficiency of the annular jet pump in transporting particles, the effects of different sand diameters on the flow field, pressure and efficiency inside the annular jet pump are analysed, in order to improve the structure of the annular jet pump to adapt to the transport of solid particles. The results show that when the flow rate is relatively small, due to the small flow rate of the suction mixture, it can not meet the suction capacity of the primary flow, which causes reflux in the suction chamber or throat; with the increase of the flow rate ratio, the transport capacity of the annular jet pump for the sand shows a parabolic growth, so to maintain the efficient transport capacity, the flow rate ratio should be selected between 0.4-0.7; the efficiency of sand transport of the annular jet pump is much higher than that of the centre jet pump, and it is much higher than that of the centre jet pump. Annular jet pump compared to the centre of the pump transport sand efficiency appeared the opposite phenomenon.
Effect of the difference in slit locations on the suppression of cavitation instabilities in an inducer.
Authors: Ishikawa Naruki , Nakura Yuto , Kawasaki Satoshi , Shimagaki Mitsuru , Iga Yuka 
Published: March 2024

Abstract
Cavitation instabilities are caused by unsteady cavitation in the inducer in liquid rocket turbopumps. This phenomenon has a negative impact on pumps and must be suppressed. Our research group has proposed a method to suppress the instabilities by adding slits to the inducer blades, and previous studies was shown the effectiveness of this method. In this study, water experiments of inducers with slits at different locations were conducted. As a results, the vibration characteristics of cavitation in the slit inducers changed when the location of the slit was changed although the cavitation instabilities were successfully suppressed in all slit inducer. The visualized image of cylindrical surface of the axial flow pump was expanded into a two-dimensional plane to determine the time variation of the area of the tip leakage vortex cavitation generated in each blade. The suppression mechanism of cavitation instabilities in each slit location was discussed from the obtained unsteady image of cavity area in each blade in the slit inducers.
The effects of balancing holes on the axial force of a centrifugal pump in the reverse mode
Authors: Fathi Mohammad , Alemi Hamed , Raisee Mehrdad , Nourbakhsh Ahmad 
Published: March 2024

Abstract
Centrifugal pumps can feasibly act as turbines in small hydropower plants. However, prediction and reduction methods of axial force is still challenging. A proposed method to this goal is the use of balancing holes. Accordingly, this paper investigates the effect of balancing holes diameter on the hydraulic performance and the axial force of a centrifugal pump as turbine (PAT). In this study, modeling of the fluid flow within the pump was carried out by using the commercial software of Ansys CFX R19.0 and the SST turbulence model. The numerical results showed that by working in the reverse mode, the operating flowrate, head and the axial force of the pump are increased remarkably. This study proved that drilling balancing holes in the impeller, despite being simple, is a useful method in reducing the axial force and has minor effects of the output power. Results showed that by drilling a hole of diameter 2 mm, the axial force is approximately decreased by 60 % in almost all flowrates. Finally, it is observed that increasing holes diameter is mostly influential at high flowrates, and with diameter of 6.5 mm, the axial force is reduced about 90%.
Optimization design of low specific speed shield pump based on orthogonal experiment
Authors: Qiu Gai , Wang Wenjie , Pei Ji 
Published: March 2024

Abstract
Low specific speed pump is characterized by generally low efficiency, easy to appear hump and optimization difficulties. In order to improve the hydraulic performance of the pump at the shut-off point (0.2Q
d) and reduce the hump phenomenon, the influence of impeller geometric parameters on the hydraulic performance of the pump is analyzed without changing the volute structure, the orthogonal experimental design of impeller parameters is carried out. Six geometric parameters, including impeller outlet diameter, impeller outlet width, blade inlet angle, blade outlet angle, wrap angle and blade thickness, are selected as design factors. Each parameter factor is taken to 3 levels, and a total of 18 schemes are designed. 3D impeller design is carried out based on CFturbo, numerical simulation is carried out with CFX. The results show that increasing the impeller outlet diameter can increase the head within a certain range. The impeller efficiency can be improved by reducing the outlet width of the impeller, increasing the blade inlet angle and increasing the wrap angle. The pump performance parameters before and after optimization are analyzed and compared, it is verified that the orthogonal experimental design method combined with numerical simulation can optimize the design of low specific speed shield pump.
Analysis of energy dissipation in allowable, restricted and prohibited operating areas of wanjiazhai francis turbine
Authors: He Gensheng , Pan Jiale , Su Lifeng , Song Xijie , Wang Zhengwei , Zhu Di , Tao Ran 
Published: March 2024

Abstract
With the “14th Five-Year Plan” and the “two-carbon” policy, the application of renewable energy has seen a substantial increase. As a kind of hydraulic machinery which converts the kinetic energy of water into electric energy, the turbine is widely used in various hydropower stations. However, due to the variability of flow rate, speed and head, how to ensure the efficiency of unit operation is particularly important in complicated working conditions. In this study, the Francis turbine of Wanjiazhai Hydropower Station is taken as the research object. Through the combination of numerical simulation and experiment, the energy consumption under the permitted, restricted and forbidden conditions is analyzed.
Simulation of water hammer in long distance water transmission pipeline based on Flowmaster
Authors: Guo H L , Chen J 
Published: March 2024

Abstract
Long distance water transportation projects are widely used in balancing water resources and other fields. However, the opening and closing of valves often causes significant pressure changes in the pipeline, whether it is positive or negative pressure, which can cause damage to the pipeline, thereby affecting the actual water transportation project. Therefore, based on the method of characteristics, this paper studies the influence of pipeline diameter, length, friction coefficient and valve closing time on the transient flow in the pipeline. The results indicated that the pressure pulsation inside the pipe is mainly concentrated at 0.4hz and its harmonics. In addition, the frequency with high amplitude mainly ranges from 2.5s to 10s, and the closer it is to the valve, the higher the amplitude at the node.
Hydrodynamic performance study of shore-based oscillating water column wave energy conversion device
Authors: Ding Jiawei , Pang Shujiao , Chen Zhenmu 
Published: March 2024

Abstract
To cope with the increasing energy demand, countries have started to actively develop renewable energy. Therefore, the study of wave energy generation devices is an important issue. In this paper, we investigate the performance and characteristics of shore-based oscillating water column wave energy generators concerning structural dimensions such as front wall draft and water depth variation. The results show that the front wall draft have significant effects on the internal flow characteristics of the oscillating water column wave energy generator. When the draft of the front wall changes, the reflection coefficient of the air chamber changes accordingly and the performance changes significantly. The variation of water depth has less effect on the performance of the low-frequency region of the oscillating water column wave energy generation device.
Flow analysis through center body of ducted fan to electric motor cooling
Authors: Dinh Van-Son , Chu Hoang-Quan , Nguyen Trung-Kien , Le Dinh-Anh , Le Ngoc-Bon , Nguyen Anh-Tuan , Kim Kwang-Yong , Dinh Cong-Truong 
Published: March 2024

Abstract
In recent years, electric Vertical Take-Off and Landing aircraft (eVTOL) have been increasingly researched and developed because of their high applicability: parcels and deliveries, rescue, military, etc. These flying machines typically use an Electric Ducted Fan (EDF) driven by an Electric Motor located within the Centre Body of this EDF. In this study, several ventilation hole concepts on the Centre Body were given to increase the cooling ability of the Electric Motor. Two-way heat transfer method were implemented to simulate the conductive and convective heat transfer phenomenon between the Computational Fluid Dynamics and Finite Element models in the cases with and without the ventilation holes. The validation of the model’s accuracy was done by comparing separately the simulation results of the EDF and the Electric Motor with the experiment data and the previous research result, respectively. The results show that the most effective ventilation hole configuration has reduced the temperature of the Rotor, End-Winding Forward, and End-Winding Rear respectively 6.66 °C, 5.54 °C, and 6.8 °C.