bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of pulsating flow on mild / deep surge phenomena of turbocharger compressor
Authors: Kawana Genshu , Asanaka Yuji , Miyagawa Kazuyoshi 
Published: May 2022

Abstract
It is known that a compressor causes a flow instability phenomenon called surge when the flow rate becomes reduced. Previous studies performed a compressor performance test using an apparatus that simulated a turbocharger for cars. As a result, they have confirmed that surge frequencies differ depending on the capacity of the tank. In this study, performance tests of a compressor for a turbocharger were conducted to understand a mechanism of surge phenomena and to understand differences between them under the steady flow and the pulsating flow. The apparatus which was used at this time consists of a compressor, a pulsating flow generator, a tank, and a valve. Except for the compressor, they install on the downstream side of it in this apparatus. The pulsating flow generator and the tank are equivalent to an automobile engine. First, to understand the difference between the mild surge and the deep surge under steady flow, the flow rate and the pressure of the tank were measured by controlling the valve under five different rotational speeds. And the two types of surge phenomena (i.e. the mild surge and the deep surge) were determined. Compared to the mild surge and the deep surge, it was judged that the former has smaller fluctuations of the flow rate and weaker surge phenomena. And, Fast Fourier Transform (FFT) analysis was performed on the measured pressure. It was found that the higher the rotation speed became, the lower the surge frequencies of the deep surge were, and the lower the rotation speed became, the weaker the strength of the surge phenomenon became. Next, it was investigated the difference in surge frequencies between the mild surge and the deep surge under pulsating flow with the rotation speed fixed. It was found that in the mild surge, the effect of pulsating flow on the surge phenomenon was significant, and it was confirmed that the surge frequencies were drawn into the pulsating frequencies. On the other hand, in the deep surge, the pressure fluctuation of the surge phenomenon became stronger than that of the mild surge, and a pattern of drawing was changed. In addition, unlike the mild surge, in the deep surge, the frequency range of draw in the same magnification between the given pulsating frequency and the obtained surge frequency narrowed. And, it was confirmed that the surge frequency was drawn into the pulsating frequency at half times rate and two times rate.
Design and Simulation of Photo-excited Tunable Perfect Absorber Based on Semiconductor-incorporated Metamaterial Structure
Authors: Ge Tingting , Li Zhijin , Song Wei , Sheng Xinqing 
Published: May 2022

Abstract
The perfect metamaterial absorber with sandwich structure is capable to realize nearly 100% microwave absorption. We designed and simulated a photo-excited tunable perfect absorber based on semiconductor-incorporated metamaterials using HFSS (Ansoft). This absorber composes of semiconductor Ge in designed pattern in the unit cell. Under different pump power of the incident laser light, the conductivity of Ge on the metamaterial varies. In this way, the absorption frequency of the absorber can be tuned. Simulation results showed that, under the two pump light conditions, the absorber is with maximum absorbances of over 97% in both cases. We also analyzed the loss in the absorber through numerical experiments.
Research on An Improved Phase Generation Carrier Demodulation Algorithm
Authors: Wei Shuangjiao , Li Bin’ai , Xue Min , Zhao Wenbin , Bian Zhenglan , Chu Fenghong 
Published: May 2022

Abstract
Traditional phase generation carrier (PGC) demodulation algorithm is often affected by modulation depth C and carrier phase delay θ. An improved PGC demodulation method was put forward in this article. The results show that when in different modulation depth, the demodulation result was stable and almost identical to the original signal to be test. With different phase delay values, such as θ=30°and 60°, the signal amplitude demodulated by the improved algorithm was consistent with the original signal. The new demodulation method can make the accuracy of the phase generation carrier technology better and improve the system performance.
Modeling and Simulation of Wide-range Current Transformer and Optimization of Core Size
Authors: Lei Jingting , Song Xiaolin , Liang Pan , Xu Zhongda , Tang Xiaojun 
Published: May 2022

Abstract
When the current transformer for traditional measurement is too large or too small, the measurement error will fluctuate greatly, resulting in a sharp deterioration of the measurement accuracy. In response to this paper establishes a simulation model of the corresponding current transformer based on SIMULINK and analyzed the error source factors of the current transformer; then, according to theoretical derivation, the simulation established the core size, ratio difference, and angle difference of the current transformer. Finally, a genetic algorithm based on nonlinear programming is used to iteratively optimize the core size of the current transformer, and finally the error of the current transformer after the core is optimized and when the core is not optimized is compared through simulation. The results show that current transformer’s ratio difference and angle difference of the current transformer are significantly reduced. Among them, the ratio difference is reduced to about 50% of the original, and the angle difference of the transformer is reduced to about 60% of the original, which greatly broadens the range of the current transformer.
Optimal Allocation Method of Distributed Generation in Active Distribution Network Based on Bi-level Programming
Authors: Zhao Yating , Wu Zhi 
Published: May 2022

Abstract
The optimal allocation method to distributed generation(DG) of active distribution network was studied. Firstly, a bi-level programming model of DG in active distribution network is established. For the cause of determining the optimal installation location and capacity of DG, the upper layer model considers the minimum cost of DG investors as the objective, and the decision variables are the installation location and capacity of DG. The lower layer model considers the system operation with the objective of minimizing the network loss. The decision variables include the voltage amplitude and phase angle of each node and the consumption of distributed generation. Secondly, an modified grey wolf algorithm is proposed to solve the lower layer model, and the lower layer model is turned to a second-order cone programming problem by convex relaxation and linearization technology. Finally, the bi-level programming model developed in this paper is verified by taking IEEE33 bus system as an example, and the simulation results verify the effectiveness of the proposed method.
Metamorphic Relation Recognition Method Based on Control Flow Graph Features
Authors: Li Cong , Liu Jie , Yang Xiaohua , Yan Shiyu , Li Meng 
Published: May 2022

Abstract
Metamorphic testing is an effective method to solve Oracle problems. It is used to test software which is no expected output or the expected output is difficult to construct. However, finding a suitable and effective metamorphic relation in the program is still a very difficult task, usually obtained by domain experts through manual analysis, which greatly reduces the efficiency of software testing. In this work we define a function parameter metamorphic relation from the operation of the function parameter sequence, and preset 10 function parameter metamorphic relation. Because functions with the same structure usually have the same function parameter metamorphic relation, we extract node features and independent path features from the control flow graph, and then create a classification model to judge the similarity between functions. Our experiment includes the evaluation of the prediction model and the prediction of the metamorphic relation on the real function. Good experimental results shows that this method can provides a new way to automated discovery of metamorphic relation.
Hydraulic and Pneumatic Transmission Three-Dimensional Virtual Training System Research
Authors: Ji Tian , Ren Boming , Huang Shengli 
Published: May 2022

Abstract
Unity Three-Dimensiongal technology is used to develop a 3D virtual training system platform for hydraulic and pneumatic transmission circuits, which realizes the simulation of basic hydraulic and pneumatic transmission circuits. The Physically Based Redering process is applied to map the 3D model created by 3DMax software, and the Unity 3D virtual scene technology is used to create the experimental 3D virtual scene and drive the model interactively. The finite state machine design pattern is applied to User Interface management, model selection and scene switching. The Model-View-Controller framework is used to determine the correctness of the linkage, and the mediator pattern is used to control the interaction of the components using buttons. The practical application shows that the system can show the working principle of hydraulics and pneumatics well, and the students can build and interact with the basic circuit to achieve the effect similar to the actual experiment.
Generalized Gelfand-Dikii equation for fermionic Schwinger pair production
Authors: Ahmadiniaz N , Kim S P , Schubert C 
Published: May 2022

Abstract
Schwinger pair creation in a purely time-dependent electric field can be reduced to an effective quantum mechanical problem using a variety of formalisms. Here we develop an approach based on the Gelfand-Dikii equation for scalar QED, and on a generalization of that equation for spinor QED. We discuss a number of solvable special cases from this point of view. In previous work, two of the authors had shown for the scalar case how to use the well-known solitonic solutions of the KdV equation to construct Poschl-Teller like electric fields that do not pair create at some fixed but arbitrary momentum. Here, we present numerical evidence that this construction can be adapted to the fermionic case by a mere change of parameters.
From theory to precision modelling of strong-field QED in the transition regime
Authors: Macleod Alexander J. 
Published: May 2022

Abstract
The combination of energetic electron beams, delivered from conventional accelerators at a high repetition rate, and ultraintense lasers, makes it possible to perform precision measurements of strong-field QED. The LUXE collaboration aims to perform precision measurements of nonlinear Compton scattering and Breit-Wheeler pair creation in the transition from the perturbative to nonperturbative regimes. Here we present an overview of recent developments in the modelling of strong-field QED processes, which are needed to reach the required precision of a few percent for intensity parameters 0.1 < ξ < 10. We discuss how to go from plane-wave QED results to numerical simulations and present predicted signals and error estimates.
Research on damage monitoring of sandwich armor composite structure based on time reversal principle
Authors: Jia Li’An , Gao Shang , Jiang Jian , Zhang Meng 
Published: May 2022

Abstract
With the wide application of lightweight armor composite, it is of great significance to monitor delamination damage in laminated materials. Ultrasonic testing often needs to be immersed in liquid for monitoring, which is inconvenient for large-size specimens and cannot be monitored in real time. In structural health monitoring, the corresponding relationship between damage and response signal characteristics (such as amplitude and energy) is established, which is greatly affected by various environmental factors (such as temperature and load). Due to the particularity of the multi-layer composite structure with large thickness, the problem of Lamb wave multi-mode and frequency dispersion affects the accuracy of damage monitoring, which brings great difficulty to the accuracy of damage monitoring. Four piezoelectric sensors were arranged on the surface of the 5 mm sandwich armor composite composed of alumina ceramic, T700 carbon fiber and TC4 titanium alloy. The signal-to-noise ratio of the obtained damage scattering signal was improved by time reversal method and Gabor wavelet transform. Monitoring and imaging of single damage and multiple damage on the reverse side of armor composite were studied. The experimental results show that the radial error of single damage location is 4.24 mm, and the radial error of multiple damage location is 5.39 mm.
Effect of MnO2 on Low-Temperature Sintered Al2O3 Ceramics
Authors: Wu Zhicong , Lang Xianji , Cai Jie , Wu Maoliang 
Published: May 2022

Abstract
In this paper, MnO2 is used as the sintering aid for alumina (Al2O3) ceramics, and 3D printing and atmospheric sintering are used to study the sintering performance of alumina ceramics at 1300 °C, 1350 °C and 1400 °C by the content of different manganese oxide. Impact. Through experimental analysis, it is concluded that when the content of MnO2 sintering aid is 0-2.4 percent, it can promote the sintering performance of alumina ceramics; and when the sintering temperature is 1350 °C, alumina ceramics has better performance under SEM electron microscope morphology.
Study on Model of Natural Gas Hydrate Formation Based on Extremely Randomized Trees
Authors: He Wang 
Published: May 2022

Abstract
It is easy to form hydrates in the development of natural gas. It is of great significance to study the formation of prediction models to guide the safe production of oil and gas fields. Based on computer intelligence algorithms, a prediction model of natural gas hydrate formation based on Extremely randomized trees was established and compared with the BP Neral Network model. To objectively evaluate the predictive power of the model, an extensive database of more than 1000 hydrate formation conditions was established. The results show that the number of optimal decision trees for the Extremely randomized trees model is 6, and the decision tree depth is 32. The BP Neral Network model has a flat error distribution with a maximum error of 6.37%. The error distribution of the Extremely randomized trees model is abrupt, with a maximum error of 3.39%, with higher stability and accuracy. In terms of pure water, the BP Neral Network model performs well only in a small number of conditions due to over-fitting, but the Extremely randomized trees model can avoid over-fitting by using the large number theorem, showing a stronger advantage.
Correlation of KOH Concentration and Electrocatalytic Performance for Methanol Oxidation of Core-shell Au@Ag@Pd Nanoparticles with Different Surface Ag Contents
Authors: Miao Tingting , Liu Yingxia 
Published: May 2022

Abstract
This paper systematically studied the electrocatalytic performance of Au@Ag@Pd nanoparticles with different surface silver contents in methanol oxidation with different KOH concentrations using the core-shell structure of Au@Ag@Pd-f-AgmPd1-m nanoparticles (where f-AgmPd1-m is added to highlight surface Ag content) as the model. Under certain conditions, the increase of KOH concentration is beneficial to the catalytic activity of methanol. When the concentration of KOH is high, it has little influence on the catalytic activity of methanol.
Design of leakage prevention and diversion alarm system based on wireless control
Authors: Li Zhengdong , Wang Yulin , Wu Xuanyan , Jin Zhao , Lu Wen , Li Xiuling 
Published: May 2022

Abstract
To solve the leakage of contrast agents due to high pressure and fast speed of the high pressure injector, an intelligent anti-leakage system is designed. The pressure sensor MS5837 detects the pressure signal in real time and transmits the pressure signal to MSP430F5529. Once the micro controller detects that the pressure exceeds the threshold value, the leakage of the contrast agent is judged. The controller immediately starts the sound and light alarm and diversion switch function, and informs the medical staff of the clinic to deal with the leakage wound in time through the wireless transmission chip NRF24L01+. This system overcomes the disadvantages of previous mechanical design, such as easy loosening, no diversion. It adds diversion switching function and wireless communication module, which ensures that medical stuff can deal with the wound in the first time without radiation and reduce the leakage damage to the minimum. The results of animal experiments show that the intelligent diversion alarm system is stable, reliable and highly sensitive, which can effectively reduce the leakage of the contrast agents of the high pressure injector and relieve the pain of the patient.
Gyro Test Evaluation Based on Grey Clustering
Authors: Guan Wentao , Jiao Ronghui , Zhao Chen 
Published: May 2022

Abstract
Based on the test and evaluation of satellite control sub-systems, this article applies the gray clustering evaluation method in the gray system theory to the lack of objective quantitative standards in the current test and evaluation, and establishes the evaluation index system and evaluation model of the two-float gyro. The model is verified by using telemetry data and the evaluation conclusion of the gyro is got. The establishment of the model provides an objective and quantitative standard for the evaluation, and reduces the subjectivity and ambiguity in the evaluation. The model and method can be applied to other components of the control sub-system, and it has promotion significance for the test and evaluation of the entire control sub-system.
A Study on Parallel Test Approach for the Flash Burn-in Experiment in Laboratory
Authors: Wang Biao , Li Hao , Zhang Zijie 
Published: May 2022

Abstract
With the increasing number of lab burn-in samples, this paper proposes a parallel test approach for the problem that the single-device test board cannot meet the requirements of the JEDEC standard for the large number of samples with high efficiency. The designed FPGA control board independently separates 4 control SCAN signals, different SCAN chips perform read operations in sequence, and complete the operation in parallel. The experimental results show that, compared with the single-device test board, the MT test board can test 80 chips at the same time, which meets the requirements of the JEDEC standard, and reduces the requirement for hardware resources in the burn-in test, and improves test efficiency.
Research on Peak Current Predictive Control Algorithm for Boost Converter with Discrete Disturbance Observer
Authors: Zhang Dong , Zhang Yiming , Cui Longfei , Wang Mingxin 
Published: May 2022

Abstract
In this paper, a peak current predictive control algorithm based on discrete disturbance observer is proposed for BOOST converter. Compared with typical peak current predictive control algorithms, the proposed algorithm does not require additional a sensor to measure the input voltage in real time. The minimum beat tuning method of discrete disturbance observer is presented. It is proved that the inductance current tracks the reference value after two sampling cycles and eliminates input voltage disturbance after five sampling cycles. Simulation and experimental show the effectiveness of the proposed algorithm.
Electronics integration for the GE2/1 and ME0 GEM detector systems for the CMS phase-2 muon system upgrade
Authors: Butalla S. D. , Hohlmann M. 
Published: May 2022

Abstract
The Large Hadron Collider is currently undergoing its High Luminosity upgrade, which is set to increase the instantaneous luminosity by about a factor of five. Consequently, the Compact Muon Solenoid experiment is upgrading its muon spectrometer to cope with the increased muon flux in the forward region. The GE2/1 triple-gas electron multiplier detector, which has recently entered the mass production phase, and the ME0 triple-GEM detector system, which is in the late prototyping phase, are undergoing electronics integration. These proceedings briefly discuss the frontend electronics for the GE2/1 and ME0 detector systems, the electronics integration testing process, and the future plans for the frontend electronics of these two detector systems by the CMS GEM collaboration.
CMS phase-2 DAQ and timing hub prototyping results and perspectives
Authors: Amoiridis V. , Behrens U. , Bocci A. , Branson J. , Brummer P. , Cittolin S. , Da Silva-Gomes D. , Da Silva Almeida J. , Darlea G.-L. , Deldicque C. , Dobson M. , Gigi D. , Dzemaili N. , Gladki M. , Glege F. , Gomez-Ceballos G. , Gutic N. , Hansen M. , Hegeman J. , Moreno G.I. , James T.O. , Kishimoto C. , Leutgeb E. , Li W. , Meijers F. , Meschi E. , Morovic S. , Orsini L. , Papakrivopoulos I. , Paus C. , Peron K. , Petrucci A. , Pieri M. , Poupakis A. , Puljak E. , Rabady D. , Raychinov K. , Racz A. , Sakulin H. , Schwick C. , Simelevicius D. , Stahl A. , Troska J. , Vazquez-Velez C. , Zejdl P. , Zokaite V. 
Published: May 2022

Abstract
This paper describes recent progress on the design of the DAQ and Timing Hub, or DTH, an ATCA (Advanced Telecommunications Computing Architecture) hub board intended for the phase-2 upgrade of the CMS experiment. Prototyping was originally divided into multiple feature lines, spanning all different aspects of the DTH functionality. The second DTH prototype merges all R&D and prototyping lines into a single board, which is intended to be the production candidate. Emphasis is on the process and experience in going from the first to the second DTH prototype, which included a change of the chosen FPGA as well as the integration of a commercial networking solution.
Emittance preservation in advanced accelerators
Authors: Lindstrøm C.A. , Thévenet M. 
Published: May 2022

Abstract
Emittance is a beam quality that is vital for many future
applications of advanced accelerators, such as compact free-electron
lasers and linear colliders. In this paper, we review the challenges
of preserving the transverse emittance during acceleration, both
inside and outside accelerator stages. Sources of emittance growth
range from space charge and instabilities caused by transverse
wakefields, which can occur in any advanced accelerator scheme
regardless of medium or driver type, to sources more specific to
plasma accelerators, such as mismatching, misalignment, ion motion,
Coulomb scattering, chromaticity between stages, and more.
U.S. advanced and novel accelerator beam test facilities
Authors: Clarke C. , Esarey E. , Geddes C. , Hofstaetter G. , Hogan M.J. , Nagaitsev S. , Palmer M. , Piot P. , Power J. , Schroeder C. , Umstadter D. , Vafaei-Najafabadi N. , Valishev A. , Willingale L. , Yakimenko V. 
Published: May 2022

Abstract
Demonstrating the viability of Advanced Accelerator Concepts
(AAC) relies on experimental validation. Over the last three
decades, the U.S. has maintained a portfolio of advanced and novel
accelerator test facilities to support research critical to AAC. The
facilities have enabled pioneering developments in a wide variety of
beam and accelerator physics, including plasma-wakefield and
structure-wakefield acceleration. This paper provides an overview of
the current portfolio of U.S. facilities possessing charged particle
drive beams with high energies, on the order of tens of joules per
pulse, or drive lasers with high peak powers, on the order of a
petawatt, and are actively conducting AAC research.