bluuebunny/crossref_metadata_2025_split huggingface dataset:
A novel medical image enhancement technique based on hybrid method
Authors: Khudhair Kifah T , Najjar Fallah H , Waheed Safa Riyadh , Al-Jawahry Hassan M , Alwan Haneen H , Al-khaykan Ameer 
Published: March 2023

Abstract
Medical images are a specific type of image that can be used to diagnose disease in patients. Critical uses for medical images can be found in many different areas of medicine and healthcare technology. Generally, the medical images produced by these imaging methods have low contrast. As a result, such types of images need immediate and fast enhancement. This paper introduced a novel image enhancement methodology based on the Laplacian filter, contrast limited adaptive histogram equalization, and an adjustment algorithm. Two image datasets were used to test the proposed method: The DRIVE dataset, forty images from the COVID-19 Radiography Database, endometrioma-11, normal-brain-MRI-6, and simple-breast-cyst-2. In addition, we used the robust MATLAB package to evaluate our proposed algorithm’s efficacy. The results are compared quantitatively, and their efficacy is assessed using four metrics: Peak Signal to Noise Ratio (PSNR), Mean Square Error (MSE), Contrast to Noise Ratio (CNR), and Entropy (Ent). The experiments show that the proposed method yields improved images of higher quality than those obtained from state-of-the-art techniques regarding MSE, CNR, PSNR, and Ent metrics.
Kaon processes in general 2HDM
Authors: Kumar Girish 
Published: March 2023

Abstract
We discuss new physics (NP) contributions to kaon mixing parameter εK
, direct CP violation parameter ε′/ε of K → ππ, and rare decays

K
+

→

π
+

ν

ν
¯

,

K
L

→

π
0

ν

ν
¯

and KL,S
→ μ+μ−
in the context of general two Higgs doublet model. We focus on contributions of top quark related exotic couplings, and show that simultaneous presence of flavor conserving and flavor violating interactions can lead to large NP effects in kaon sector, while being consistent with the stringent constraints from B physics observables such as

B

s
(
d
)

−

B
¯

s
(
d
)

mixing, Bs
→ μ+μ−, and b → sγ. We stress on the importance of correlations between εK
,

K
+

→

π
+

ν

ν
¯

and Bs
→ μ
+
μ
− that can be exploited to distinguish the parameter space corresponding to a light (sub-TeV) or heavy (TeV) scale charged Higgs boson.
A new KS
→ πeν branching fraction measurement from KLOE-2
Authors: Lucia Erika De 
Published: March 2023

Abstract
The KLOE-2 Collaboration continues the KLOE long-standing tradition of flavour physics precision measurements in the kaon sector with a new KS
→ πeν branching fraction measurement with 1.63 fb−1 KLOE data acquired at the DAΦNE Frascati ϕ-factory. The strategy to achieve this new result has been presented together with the combination with our previous BR(KS
→ πeν) measurement, based on an independent data sample, which allows the total precision to be improved by almost a factor of two, and a new derivation of f
+(0)|Vus
|.
Measurement of the rare decay K
+ → π
+
μ
+
μ
− at the NA62 experiment
Authors: Koval Michal 
Published: March 2023

Abstract
The NA62 experiment at CERN reports results from the study of the flavour-changing neutral current decay K
+ → π
+
μ
+
μ
− using a data sample recorded in 2017–2018 with a dedicated pre-scaled di-muon trigger. The sample comprises about 28k signal events with negligible background contamination, and the presented results include the most precise determination of the corresponding branching fraction and the form factor parameters.
A direct test of T, CP and CPT symmetries in transitions of neutral kaons with KLOE data
Authors: Domenico Antonio Di 
Published: March 2023

Abstract
Direct tests of T, CP, CPT symmetries in transitions processes of neutral kaons are briefly reviewed. The exchange of in and out states required for a genuine test involving time-reversal is implemented exploiting the entanglement of

K
0

K
¯

0

pairs produced at a ϕ-factory.
A data sample collected by the KLOE experiment at DAΦNE corresponding to an integrated luminosity of about 1.7 fb−1 is analysed to study the ϕ → KSKL → π
+
π
−
πeν and ϕ → KSKL → πeν 3π
0 processes, and to perform the first direct tests of T and CPT symmetries in kaon transitions with a precision of few percent, and to observe CP violation with this novel method.
Search for the pair production of dark particles in

KL0

decays at KOTO
Authors: Lin Chieh 
Published: March 2023

Abstract
We present the first search for the pair production of dark particles X in

K
L
0

decays assuming that X decays into two photons promptly. No signal was observed in the mass regions of 40 − 110 MeV/c2 and 210 − 240 MeV/c2. This leads to

B
(

K
L
0

→
X
X
)
<
(
1
−
4
)
×

10

−
7

and

B
(

K
L
0

→
X
X
)
<
(
1
−
2
)
×

10

−
6

at the 90% confidence level for the two mass regions, respectively.
HIKE: High Intensity Kaon Experiments at the CERN SPS
Authors: Moulson Matthew 
Published: March 2023

Abstract
The availability of high intensity kaon beams at the CERN SPS North Area gives rise to unique possibilities for sensitive tests of the Standard Model in the quark flavor sector. Precise measurements of the branching ratios for the flavor-changing neutral current decays

K
→
π
ν

ν
−

can provide unique constraints on CKM unitarity and, potentially, evidence for new physics. Building on the success of the NA62 experiment, plans are taking shape at CERN for a comprehensive program that will include experimental phases to measure the branching ratio for

K
+

→

π
+

ν

ν
−

to ∼5% and to

K
L

→

π
0

ν

ν
−

to ∼20% precision. These planned experiments would also carry out lepton flavor universality tests, lepton number and flavor conservation tests, and perform other precision measurements in the kaon sector, as well as searches for exotic particles in kaon decays. We overview the physics goals, detector requirements, and project status for the next generation of kaon physics experiments at CERN.
Online Event Selection and GPU-based Waveform Compression at the High Level Trigger of the KOTO Experiment
Authors: Gonzalez Mario 
Published: March 2023

Abstract
The Data Acquisition (DAQ) system of the KOTO experiment is currently undergoing a major upgrade, following an also ongoing accelerator’s beam intensity upgrade. The throughput of the current DAQ is limited by the hardware, and different prescalings have to be applied to reduce the data rate to a manageable level. The DAQ upgrade aims to remove the hardware bottleneck, increasing the amount of data that reaches the high level trigger system. The new high level trigger will make use of parallelization over CPU and GPU threads to perform event reconstruction, selection, and compression, to eventually allow for more variate physics searches in KOTO.
Development of a PMT base used for the new charged veto detector in the J-PARC KOTO experiment
Authors: Kitagawa Ayumu 
Published: March 2023

Abstract
The KOTO experiment searches for the rare decay

K
L

→

π
0

ν

ν
¯

at J-PARC. The largest background in the data collected in 2016-2018 was caused by decays of K
±. To detect K
±, we are developing an in-beam charged veto detector to be installed upstream of the KOTO detector. It uses a 0.2mm-thick thin plastic scintillator. The escaped light is reflected and collected by a 12-μm-thick aluminized mylar, and read out by an array of PMTs placed outside the beam. We newly developed PMT bases to be used for this detector. Based on an electron beam test, we expect the K
± background to be reduced by more than a factor 100. We plan to install this detector in the KOTO beam line, in December 2022.
Generic model of heavy new physics for the kaon systems
Authors: Moldanazarova Ulserik 
Published: March 2023

Abstract
Various precision observables, such as flavour changing decays, are loop induced in the standard model and their renormalisation involves cancellations between purely bosonic and fermionic interactions. Here, I will show how perturbative unitarity constraints can be used to derive renormalised matching conditions for generic theories. These general results comprise the matching conditions for specific models that address current flavour anomalies and can be used for phenomenological analyses for rare and CP violating kaon decays.
Effective theory for universal seesaw model and FCNC
Authors: Morozumi Takuya , Adam Apriadi Salim , Kawamura Yuta , Panuluh Albertus Hariwangsa , Shimizu Yusuke , Yamamoto Kei 
Published: March 2023

Abstract
We study the quark sector of the universal seesaw model with SU(2)
L
× SU(2)
R
× U(1). The model incorporates the seesaw mechanism with the vector-like quarks (VLQs). The purpose of this work is to study the model with the effective theory. After integrating the heavy five VLQs, we derive the effective theory with four up-type quark and three down type quark. In this work, the FCNC of Z boson for top quark and top′ quark is derived.
Study of weak-basis invariants in the universal seesaw model using Hilbert series
Authors: Panuluh Albertus Hariwangsa , Morozumi Takuya 
Published: March 2023

Abstract
Universal Seesaw Model is a model which explains the mass hierarchy of the quark sector. This model introduces vector-like quarks. The top quark mass is generated in the electroweak scale and the other quark mass is generated using a seesaw-like mechanism. The invariant theory helps construct a weak-basis invariant. We study the weak-basis invariant (WBI) using Hilbert Series (HS) and apply it to the Universal Seesaw Model, particularly the one-generation case of the quark sector.
KL0→γ+darkphoton(γ¯)

Search at the J-PARC KOTO Experiment
Authors: Wu Tong 
Published: March 2023

Abstract
We present the study of massless dark photons in the decay of

K
L
0

→
γ

γ
¯

in the J-PARC KOTO experiment. The massless dark photon

(

γ
¯

)

is different from the massive dark photon because it does not mix directly with ordinary photons, but it could interact with SM particles through direct coupling with quarks. In some theoretical predictions, the

B
R
(

K
L
0

→
γ

γ
¯

)

can be as large as 𝒪(10-3), which is well within the sensitivity of KOTO. Because of the lack of kinematic constraints, searching for

K
L
0

→
γ

γ
¯

could be challenging, but the hermetic veto system of KOTO provides a unique opportunity to probe for this decay. We used three techniques to suppress the neutron background, based on machine learning, Fourier analysis, and both-end readout. We will present the background suppression result based on data collected in 2020.
Effect of interstitial nitrogen on bonding characteristics and electronic structure of high nitrogen steel
Authors: Ning Kai , Bai Di , You Xianxian , Zhang Hong , Liu Fengde 
Published: March 2023

Abstract
Interstitial nitrogen can significantly change the electronic structure and bonding characteristics of austenite, and has an important influence on the properties of austenite. The bonding properties and properties of high nitrogen steel with different nitrogen element ratios were calculated. The alloy model with different nitrogen content is established, and the properties of energy, density of states and elastic constant are calculated. Increasing the nitrogen content will reduce the density of states and energy, significantly improving the stability of the cell. The crystal cells with different nitrogen content meet the mechanical stability. With the increase of nitrogen content, the elastic modulus, Poisson’s ratio gradually decreases, strength, shear strain and deformation resistance increase, and plasticity and ductility decrease.
Wide-Frequency Range Voltage Monitoring Device for Current Transformer
Authors: Zhou Guowei , Chen Xin , Zheng Hong , Yin Jiaqi , Peng Chenguang 
Published: March 2023

Abstract
To optimize the online voltage monitoring technology of the power grid and realize real-time fault warning for the power grid and capacitive devices such as current transformers (CT), this paper proposes a wide-frequency range voltage monitoring method based on current transformers according to the idea of measuring the leakage current of capacitive devices to restore the line voltage. The method measures the current transformer leakage current to invert the bus voltage and uses a wide frequency range current sensor to meet the measurement of high-frequency waveforms. This paper designs a CT wide-frequency range voltage monitoring device based on this method and conducts field tests of the device’s measurement effects. Through the fault monitoring test and voltage monitoring test, it is verified that the monitoring device is fully functional and can achieve accurate monitoring of harmonics, end shield current, relative dielectric loss, high-frequency partial discharge, and bus-voltage with high amplitude and high frequency, which can provide support for fault analysis and insulation design improvement and is of great significance to ensure safe and stable operation of the power grid.
Research on Material Selection and Electromagnetic Characteristics of Composite Electromagnetic launcher
Authors: Li Gen , Shu Tao , Zheng Hanchao , Lin Chenjie , Zhang Pengxiang , Wang Yingying 
Published: March 2023

Abstract
The armature and rail thermal ablation caused by the current concentration phenomenon will affect the service life of the guideway during the operation of the compound four-rail electromagnetic emitter. With different rail materials simulated and analyzed using the finite element analysis method and the ANSYS software, the composite four-rail electromagnetic launcher’s current density distribution and electromagnetic field distribution were designed to optimize and improve the thermal ablation of the armature and rail of the composite electromagnetic launcher. The results show that the copper steel composite electromagnetic launcher can improve the current concentration and electromagnetic shielding ability.
A Method Based on Phase-shifting Carrier for Reducing DC-link Current Harmonics in Dual Three-phase PMSM Drive under Open-phase Conditions
Authors: Wang Qingzhe , Du Yanwei , Yang Guang , Liu Hongyang 
Published: March 2023

Abstract
The All-Electric of modern military equipment has become an important trend, in the field of aircraft the traditional servo control focus on the exact control of the motor. With the development of power electronics technology, a high-power motor has expanded into a multiphase kind which cast off the limitation of traditional three-phase motors. The multiphase motor has more control resources and fault-tolerant control ability under the fault condition, which has practical meaning for high safety and high-reliability applications in an airborne environment. The multiphase motor can be controlled by a series of phase-shift carriers, which can reduce DC current ripple more effectively than the traditional carrier-based pulse width modulation, but it needs to find the optimal phase shift angle. In this paper, the optimal carrier phase shift angle is analyzed mathematically which can be used for both under health and single open-phase fault of a dual three-phase motor, and the simulation result illustrates that the carrier phase shift method used in this paper has the DC current ripple optimization effect.
Simulation Research for Thermal Characteristics for Temperature Gradient of Three-core Cable Joint
Authors: Wang Shaohua , Wu Xuxiang , Cao Junping , Tao Ruixiang , Xia Rong , Zhao Jian , Li Xing , Yang Fan 
Published: March 2023

Abstract
Temperature is one of the important parameters of power cables with normal operation. In this article, the electromagnetic and thermal characteristics of three-core cable joints were investigated. And the core and surface temperature gradient were obtained with a three-core cable joint. The research results show that the core temperature of the center is about higher than 14 °C than the body part. The surface temperature is distributed as high at the center and low at the body. The surface fluctuation amplitude of the joint center temperature is about 10 °C. The maximum surface temperature gradient with the center can reach 1697 °C/m of cable joint. The results here should have potential application value in characteristics of electromagnetic-thermal coupling field under the action of internal defects of cable joint.
Study on electric field distribution of multi-layer dielectric under mixed voltage
Authors: Zhang Shiling 
Published: March 2023

Abstract
The combination of field and circuit analysis method is used. Taking the multilayer flat dielectric structure as an example, the electric field distribution law of multilayer dielectric under mixing and polarity reversal voltage is studied by using the electromagnetic field theory. Then, according to the actual situation, two typical multilayer dielectric structures are selected, equivalent circuit model is established, and multilayer dielectric equivalent circuit experiment is carried out. At the same time, the equivalent circuit is simulated and analyzed by using the circuit simulation to further analyze the distribution law of electric field under various voltages. On this basis, the finite element simulation is used to simulate the double-layer plate dielectric structure model, which verifies the applicability of the finite element simulation method in the calculation of AC/DC hybrid electric field. Finally, the structural model of ±800kV converter outlet bushing is established, and the AC, DC, AC and DC superposition and polarity reversal voltage are loaded respectively. The electric field distribution in each medium of the complex insulation structure is calculated and analyzed accordingly. The results show that the finite element simulation method is simple and effective, and it is feasible to study the electric field distribution law and insulation structure optimization of the complex insulation structure under AC/DC mixed voltage. This paper studies E-field distribution law of multi-layer media under AC/DC mixed voltage, which has practical reference significance for the external insulation design of converter bushing, wall bushing and converter valve, and is of the great value for the actual DC power transmission and transformation project.
Study on the correction method of the influence of temperature factor in the simulation calculation of transformer bias current
Authors: Wang Ke , Sun Jiantao , Shen Hao , Zhao Wenbin 
Published: March 2023

Abstract
For analyzing the mechanism of single-polar earth operation of the HVDC transmission system arousing the DC bias of the transformer and correcting the influence of temperature factors on simulation, abstract grids were built. Based on the disciplinarian of ambient temperature affecting the DC resistivity of conductors and shallow soil, the mechanism of the ambient temperature taking effect on the DC bias current of the transformer was discussed. Applying the practical field measurement results, conclusions from the simulation and calculation were proved, and the method of classification correction was present. It was indicated that the modified calculation results of the transformer DC bias current would be closer to the actual measurement values.
Analysis of Regenerative Braking Strategy for Electric Vehicles Based on Braking Intention
Authors: Guo Bin , Zhang Hui 
Published: March 2023

Abstract
Improved energy recovery during braking is the goal of the distributed drive electric car regenerative braking system. A regenerative braking control strategy for electric vehicles based on braking intention is suggested in order to address various drivers’ braking intents and road adhesion circumstances. An electric vehicle regenerative braking model for distributed drives is created using the MATLAB/Simulink tools. On the basis of FTP-75 operating conditions and open road operating conditions, the efficacy and economy of the control strategy in this study are verified. According to the various road adhesion coefficients, the simulation results demonstrate that the control method in this work can appropriately divide the braking torque of the wheels on both sides of the coaxial wheel. The technique can successfully enhance the regenerative braking recovery of distributed drive electric vehicles as compared to the often employed regenerative braking control method.
Numerical Simulation of Centrifugal Pump Cavitation Based on ANSYS
Authors: Dong Jie , Li Wei 
Published: March 2023

Abstract
Centrifugal pump is the key equipment in petrochemical, agriculture, shipbuilding and other industries. Its safe, reliable and reliable work is an important guarantee to ensure its normal operation. Cavitation is a kind of unsteady compressible turbulent flow, which has a great influence on its performance and efficiency due to material exchange between gas and liquid phases. The appearance of the impeller internal cavitation phenomenon will reduce the pump head and efficiency, which is caused by the impeller and other flow components of damage, causing greater noise, and thereby the pump work and work performance have been greatly affected. Improving the efficiency of the centrifugal pump will undoubtedly reduce the social requirements for energy, which is consistent with the current goal of energy conservation and emission reduction advocated by society. The performance and efficiency of a centrifugal pump can be improved effectively by numerical simulation and analysis of the cavitation phenomenon.
Modeling and Control of Quadcopter Based on Sliding Mode Robust Control in the Wind Field
Authors: Lv Yulong , Shi Yongkang 
Published: March 2023

Abstract
Due to the low flying height, quadrotors are easily affected by external wind disturbances. In this paper, the dynamic model of the quadrotor flying in the wind field is established according to the Newton-Euler equation. The model introduces a weight function due to the phenomenon that different rotors are affected differently by the wind field due to their different positions relative to the wind field, and a sliding mode robust controller based on inner and outer loops is designed. The verification of the control system is carried out by means of simulation in a Gazebo and actual flight experiments in the wind field. The dynamic of the system and the controller performance under the wind field are also tested. The results show that the designed controller has the performance of stable flight in the wind field environment.
Research on Optimization SVPWM Method of Nine-switch Inverter for Bearingless Motor Based on Reducing Switching Times
Authors: Li Jinhui , Qiu Zhijian 
Published: March 2023

Abstract
The traditional bearingless motor system controlled by two three-phase inverters has a high cost and volume. In this paper, the nine-switch converter is applied to the bearingless motor control system, which can control the torque winding and suspension winding of the bearingless motor at the same time to save three MOSFETs. This paper proposes a nine-switch inverter SVPWM method to reduce switching loss. This method is no longer limited to only considering the action sequence of voltage vectors but reduces the switching number from selecting voltage vectors. The optimal nine-switch inverter basic voltage vector selection principle is determined by comparing the switching times of each sector combination with different voltage vector combinations. Finally, the simulation results verify the effectiveness of this method.