Yupei Wang

Yupei Wang
Institute of Modern Physics, Chinese Academy of Sciences

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208
Publications
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Introduction
Skills and Expertise

Publications

Publications (208)
Article
Full-text available
Electrical machine optimisation is normally a high‐dimensional non‐linear multi‐objective optimisation problem. A multi‐level optimisation (MO) strategy is currently used to improve efficiency, where sensitivity analysis is required for dividing design parameters into different groups. However, the conventional MO strategy cannot handle ultra‐high‐...
Article
Synchronous reluctance machines (SynRM) have received much research attention due to their simple structure, wide speed regulation ability, and no need for permanent magnet excitation. However, the SynRM still has the disadvantages of lower output torque, lower power factor, and lower efficiency compared to permanent magnet synchronous machines. In...
Article
Transformers often encounter electromagnetic transients, such as ferromagnetic resonance and inrush currents. An accurate low-frequency modeling of transformers is essential for analyzing power system faults. However, the lack of accurate magnetic characteristic modeling in most commercial software results in the electromagnetic transient calculati...
Article
By designing stator teeth using grain-oriented sheets (GO) and other parts still with non-grain-oriented sheets (NGO), the electromagnetic performance of the interior permanent magnet synchronous machine (GO-IPMSM) can be improved greatly. As the stator core of the designed GO-IPMSM is a hybrid core that is composed of two different silicon sheets,...
Article
Full-text available
When the off-line transformer is re-energized, the phase-controlled switching strategy can avoid the generation of inrush current by controlling the phase. To determine the closing phase, the residual flux density (Br) in the transformer core needs to be accurately measured. This paper proposes a Br estimation method for three-phase transformers ba...
Article
Due to the presence of transformer residual flux, the magnetic flux of the core rapidly reaches saturation, thus causing an inrush current when the no-load transformer is directly connected to the grid, which affects the safe operation of the grid. Therefore, it is necessary to study the residual flux in the core to reduce the inrush current. Howev...
Article
As no permanent magnet (PM) material is required and only silicon sheets are needed on the rotor core, the synchronous reluctance machine (SynRM) has received tremendous research attention in the past, and it can be used for many driving applications. However, compared with the electrical machine with PM excitation, its torque density, efficiency,...
Article
The magnetic core of a conventional tubular flux-switching permanent magnet machine (TFSPMM) is made of axially laminated silicon steel sheets. The laminated direction is consistent with the motion direction of the mover. According to the flux-switching principle, a large amount of eddy current loss will be generated when the alternating flux passe...
Article
This paper proposes an axial–radial flux hybrid excitation permanent magnet eddy current coupling (HE-PMEC), where the ferrite magnet is employed for producing the radial flux and the DC excitation current is adopted for producing the axial flux. Moreover, a shielding layer is developed to regulate the radial magnetic field. Its magnetic field dist...
Article
Full-text available
Aim: To explore the relationship between the serum sodium level on admission and all-cause mortality in HF patients. Design: A single-center retrospective cohort study. Methods: Patients hospitalized with HF at the Heart Failure Center, Fuwai Hospital, from November 2008 to November 2018 were enrolled. Results: A total of 3649 patients were...
Preprint
Full-text available
Electrical machine optimization is normally a high-dimensional nonlinear multi-objective optimization problem. To improve the efficiency, multi-level optimization strategy is currently used, where sensitivity analysis is required for dividing design parameters into different groups. However, the conventional multi-level optimization strategy cannot...
Article
Full-text available
As permanent magnet claw pole machine (PMCPM) is designed with a complex 3D magnetic structure, the 3D finite element method (FEM) is commonly used for its accurate performance analysis. However, using 3D FEM will consume a long time in the initial design stage. Its analysis time can be saved greatly by using the analytical method (AM) or equivalen...
Article
Full-text available
A serious inrush current may occur when a power transformer is re-energized, which will cause many adverse effects on power equipment and the power grid. The corresponding potential hazards can be reduced if the existing residual flux density ( B r ) can be accurately measured. Combined with the field-circuit coupling analysis method, a novel metho...
Article
In recent years, with the increasing requirements of machine performance, the traditional electrical machine structure and optimization methods are more and more difficult to meet the application needs. Aiming at solving the problem of high dimensional multi-objective nonlinear strong coupling optimization, it is necessary to study the efficient op...
Preprint
Full-text available
This paper proposes an axial-radial flux hybrid excitation permanent magnet eddy current coupling (HE-PMEC), where the ferrite magnet is employed for producing the radial flux and the DC excitation current is adopted for producing the axial flux. Moreover, a shielding layer is developed to regulate the radial magnetic field. Its magnetic field dist...
Article
The permanent magnet claw pole machine (PMCPM) is a special kind of transverse flux machine, different from conventional electrical machines the main magnetic flux path of PMCPM is 3D. Therefore, for accurate performance analysis,the 3D finite element method (FEM) is required to calculate both the electromagnetic characteristics and thermal distrib...
Preprint
Full-text available
As permanent magnet claw pole machine (PMCPM) is designed with complex 3D magnetic structure, the 3D finite element method (FEM) is commonly used for its accurate performance analysis. However, using 3D FEM will consume very long time in the initial design stage. Its analysis time can be saved greatly by using the analytical method (AM) or equivale...
Article
Full-text available
With the adoption of 3D magnetic flux material and global ring windings, permanent magnet transverse flux machine (PMTFM) with soft magnetic composite cores can output relatively high torque density and only requires easy manufacturing process. For the PMTFM, there are two ways to put the permanent magnets (PMs). One is to put the PMs on the rotor...
Article
Due to the low inductance of an axial flux permanent magnet machine (AFPMM), the constant power speed regulation range is small. A new mechanical flux-weakening method for single-rotor single-stator AFPMMs is proposed in this paper. By installing a mechanical flux-weakening device on one side of the stator and rotating it certain angle, the speed r...
Article
Full-text available
Bcl-x pre-mRNA splicing serves as a typical example to study the impact of alternative splicing in the modulation of cell death. Dysregulation of Bcl-x apoptotic isoforms caused by precarious equilibrium splicing is implicated in genesis and development of multiple human diseases, especially cancers. Exploring the mechanism of Bcl-x splicing and re...
Article
This paper proposes a novel flux switching claw pole machine (FSCPM) with soft magnetic composite (SMC) cores. The proposed FSCPM holds advantages of the conventional flux switching permanent magnet machine (FSPMM) and claw pole machine (CPM) with SMC cores. As permanent magnets are installed between the stator claw pole teeth, FSCPM has good flux...
Article
This paper proposes a novel permanent magnet assisted synchronous reluctance (PMAREL) machine, the main structure of this machine is quite similar to that of traditional PMAREL machine, and the main difference is that the grain-oriented silicon steel is used to replace some part of the stator teeth. The rolling direction of the grain-oriented silic...
Article
Full-text available
As there is no need of permanent magnet (PM) material and only silicon steel sheet required on the rotor, synchronous reluctance machine (SynRM) can be used for many applications and draws a great research interest. For the SynRM, the torque ripple is a big issue and a great of work could been done on reducing it. In this paper, asymmetrical magnet...
Article
With the continuous improvement of magnetic and mechanical properties of soft magnetic composite (SMC) material, there is a trend to develop novel electrical machines with SMC cores for some special applications. Among these electrical machines, permanent magnet claw pole machine (CPM) has been extensively studied over the past few decades. As line...
Article
Background Clinical characteristics and prognostic predictors of hospitalized heart failure with improved ejection fraction (HFiEF) patients compared to heart failure with preserved ejection fraction (HFpEF) patients are still unclear. Methods We consecutively included hospitalized heart failure patients with left ventricular ejection fraction (LV...
Article
Aims Our study summarized and analyzed the clinical characteristics and thrombosis distribution of patients diagnosed with both Heart failure(HF) and intracardiac thrombosis, and explored the clinical characteristics of this kind of patients. Methods Patients who were diagnosed HF combined with intracardiac thrombosis and admitted in Fuwai Hospita...
Article
Objective To investigate the prevalence and clinical factors correlated with phenotypes of sleep apnea (SA) in acute decompensated heart failure (ADHF). Methods Patients hospitalized with ADHF were prospectively enrolled in this study from February 2019 to January 2020. All enrolled patients underwent one-night sleep study using a multichannel car...
Article
Full-text available
The performance of traditional flux switching permanent magnet tubular machine (FSPMTM) are improved by using new material and structure in this paper. The existing silicon steel sheet making for all mover cores or part of stator cores are replaced by soft magnetic composite (SMC) cores, and the lamination direction of the silicon steel sheet in st...
Article
The detent force caused by the cogging effect and end effect will seriously affect the operation of a tubular flux-switching permanent magnet motor (TFSPMM). This paper proposes a method to weaken the end effect and minimize the detent force and force ripple of a TFSPMM using un-equal width stator slots. To overcome the problem of excessive calcula...
Article
In this paper, the Morris method of qualitative global sensitivity analysis (GSA) is used to rank the sensitivity values among four design parameters and three objectives of transverse flux induction heating (TFIH) device. The design parameters include effective value and frequency of the exciting current, the moving speed of the strip and the leng...
Article
To improve output torque ability and reduce torque ripple in traditional synchronous reluctance motor (TSynRM), a new synchronous reluctance motor (NSynRM) is proposed in this paper. The rotor of NSynRM is composed of both grain-oriented silicon steel and non-oriented silicon steel. With the reasonable design of rotor structure, the torque of NSynR...
Article
Full-text available
Cervical cancer is the second most common malignant tumour threatening women’s health. In recent years, heavy-ion beam therapy is becoming a newly emerging therapeutic mean of cancer; however, radio-resistance and radiation-induced damage constitute the main obstacles for curative treatment of cervical cancer. Therefore, to identify the radiosensit...
Article
Full-text available
Emerging evidence indicates that reprogramming of energy metabolism involving disturbances in energy production from a defect in cellular respiration with a shift to glycolysis is a core hallmark of cancer. Alterations in cancer cell energy metabolism are linked to abnormalities in mitochondrial function. Mitochondrial dysfunction of cancer cells i...
Article
A new axial flux permanent magnet machine (AFPM) with soft magnetic composited (SMC) cores is proposed for electric vehicle (EV) application in this paper. As its windings are wound on the stator ring core, it can be regarded as a toroidally wound internal stator (TORUS) machine. With the adopted SMC material for stator core, this machine has the b...
Article
Full-text available
Pladienolide B is a potent cancer cell growth inhibitor that targets the SF3b1 subunit of the spliceosome. There is considerable interest in the compound as a tool to study SF3b1 function in cancer. However, so far little information is available on the molecular mechanism of SF3b1 eliciting apoptosis in cancer cells. Here, we investigated the mole...
Article
Compared with traditional induction machine and direct current machine, permanent magnet synchronous machine (PMSM) holds many merits like higher torque ability and efficiency when high magnetic co-energy sintered NdFeB magnet is used. However, for the operation with high frequency, the resulted eddy current loss by the permanent magnet (PM) is ver...
Article
Full-text available
This paper proposes a new rotary flux switching transverse flux machine with the ability of linear motion (FSTFMaLM), in which both the stator and the rotor cores are made by using soft magnetic composite (SMC) materials. With the special design pattern, for the rotary motion model, the proposed machine can combine both the advantages of the flux s...
Article
Prostate cancer (CaP) is the second most common cancer in men worldwide in 2012, and radiation therapy is one of the most common definitive treatment options for localized CaP. However, radioresistance is a major challenge for the current radiotherapy, accumulating evidences suggest microRNAs (miRNAs), as an important regulator in cellular ionizing...
Article
Compared with rotary electrical machine in linear drive applications, linear machine without rotary-linear motion conversion equipment can have higher force density and efficiency. Linear superconductivity machine (LSM) consists of high performance superconducting magnet instead of permanent magnet can offer very high force density and efficiency c...
Article
Full-text available
Pre-mRNA splicing is a fundamental process that plays a considerable role in generating protein diversity. Pre-mRNA splicing is also the key to the pathology of numerous diseases, especially cancers. In this review, we discuss how aberrant splicing isoforms precisely regulate three basic functional aspects in cancer: proliferation, metastasis and a...
Article
Exosomes are nanoscale vesicles shed from all cell types and play a major role in communication and transportation of materials between cells due to their ability to transfer proteins and nucleic acids from one cell to another. Analogous in size and function to synthetic nanoparticles, exosomes offer many advantages, rendering them the most promisi...
Article
Full-text available
By using global ring winding, the torque coefficient of the transverse flux machine (TFM) is proportional to its number of pole pairs, and thus the TFM possesses high torque density ability when compared with other electrical machines. As a special kind of TFM, the claw pole machine (CPM) can have more torque due to its special claw pole teeth. The...
Article
Full-text available
Carbon ion therapy is a promising modality in radiotherapy to treat tumors, however, a potential risk of induction of late normal tissue damage should still be investigated and protected. The aim of the present study was to explore the long-term cognitive deficits provoked by a high-linear energy transfer (high-LET) carbon ions in mice by targeting...
Article
Mitochondrion are one of the most important organelles in eukaryotic cells, the main function of which is to provide energy for the survival of cells. The abnormal mitochondrial can cause lesions in cells and even organs, and a growing number of diseases have been linked to mitochondrial defects. Mitochondrial transplantation, an intrusive therapy,...
Article
By using the powder metallurgy technology and the magnetic isotropy characteristic of the soft magnet composite (SMC) material, various kinds of permanent magnet machines can be designed and fabricated easily. However, the torque density of permanent magnet machines with SMC core are generally lower than that with silicon steels. To develop the pot...
Article
Full-text available
As one of the main parasitic parameters in permanent magnet (PM) synchronous machines (PMSMs), cogging torque is the main component of the torque ripple, which has always been the handicap in the high-performance, low-speed drive systems. Over the last two decades, various methods have been proposed to decrease the cogging torque in both radial-flu...
Article
Full-text available
Background: F1Fo-ATP synthase (F1Fo-ATPase) is a reversibly rotary molecular machine whose dual functions of synthesizing or hydrolyzing ATP switch upon the condition of cell physiology. The robust ATP-hydrolyzing activity occurs in ischemia for maintaining the transmembrane proton motive force of mitochondria inner membrane, but the effect of F1F...
Article
In this paper, a new 3-D flux transverse flux flux switching permanent magnet machine (3DFTFFSPMM) is proposed, the cost of this machine is very low since both the Soft magnetic composite (SMC) cores and ferrite magnets are very cheap, and the performance of this machine is good due to the special topology is designed. For the qualitative analysis...
Article
All living organisms and ecosystems are permanently exposed to ionizing radiation. Of all the types of ionizing radiation, heavy ions such as ⁵⁶Fe have the potential to cause the most severe biological effects. We therefore examined the effects and potential mechanisms of iron ion irradiation on the induction of developmental toxicity and apoptosis...
Article
Full-text available
Since permanent magnets (PM) are stacked between the adjacent stator teeth and there are no windings or PMs on the rotor, flux-switching permanent magnet machine (FSPMM) owns the merits of good flux concentrating and robust rotor structure. Compared with the traditional PM machines, FSPMM can provide higher torque density and better thermal dissipa...
Article
Full-text available
Soft magnetic composite (SMC) is a popular material in designing of new 3D flux electrical machines nowadays for it has the merits of isotropic magnetic characteristic, low eddy current loss and high design flexibility over the electric steel. The axial flux machine (AFM) with the extended stator tooth tip both in the radial and circumferential dir...
Article
The inhibitory effects of carbon monoxide (CO), generated by Ru(CO)3Cl-glycinate [CO-releasing molecule (CORM-3)], on developmental toxicity in zebrafish embryos induced by ionizing radiation with different linear energy transfer (LET) were studied. Zebrafish embryos at 5 h post-fertilization were irradiated with X-ray (low-LET) and carbon-ion (hig...
Article
Siberian crane ( Leucogeranus leucogeranus ) is one of the most endangered species in the world. The ecological integrity of its main wintering ground at Poyang Lake in China is crucial for the future of the species because Poyang Lake accommodates 99% of its global population. With the Three Gorges Dam fully operational, science‐based adaptive str...
Article
Molybdenum was extracted by hydrometallurgy leaching from low grade molybdenum calcine. The mineral compositions of the calcine roasted from low grade molybdenum concentrate were tested by X-ray diffraction. The results indicate that the leaching rate by ammonia is low because of the existence of molybdate and low state of molybdenum phase in the m...
Conference Paper
The critical challenge to the successful implementation of ‘perfect lens’ and ‘optical cloaking’ is to achieve isotropic negative index metamaterials. Here we experimentally demonstrate isotropic negative index metamaterials at optical frequency by proper design and scalable self-assembly.
Article
In this paper, various kinds of electrical machines with soft magnetic composite (SMC) cores are compared, based on the qualitative and quantitative comparison methods. In the first part, the performances of five typical electrical machines with SMC cores are qualitatively compared. Simplified power equations for transverse flux, axial flux, and ra...
Article
Full-text available
Reports have shown that a certain level of reactive oxygen species (ROS) can promote mitochondrial DNA (mtDNA) replication. However, it is unclear whether it is the mitochondrial ROS that stimulate mtDNA replication and this requires further investigation. Here we employed a photodynamic system to achieve controlled mitochondrial singlet oxygen ((1...
Article
Aims: Radiation-induced hyperproliferation of intestinal crypts is well documented, but its potential tumorigenic effects remain elusive. Here we aim to determine the genomic surveillance process during crypt hyperproliferation, and its consequential outcome after ionizing radiation. Main methods: Crypt regeneration in the intestine was induced...
Article
The mechanism of chemical reactions was studied on the oxidation of low grade molybdenum concentrate with addition of calcium oxide by the methods of XRD and TG-DSC, and the optimum conditions of calcium-based roasting and acid leaching were determined. The result of TG-DSC shows that the reactions are composed mainly of decomposition of Ca(OH)2, o...
Article
The gas reservoirs with deep burial developed high formation pressure. Large amount of tested pressure data were collected and formation pressure framework and distribution were analyzed, and revealed their relationships with gas reservoirs. The results showed that the values of formation pressure and pressure coefficient are 85~127 MPa and 1.5~1.9...
Article
Leaf area index (LAI), defined as half the total developed area of green leaves per unit ground horizontal area, is an extremely important vegetation characteristic parameter that describes the construction of vegetation canopy. For the past few years, LAI has been estimated operationally at a regional or even global scale by means of various retri...
Article
Objective: To identify the clinical profile and the neuroimaging characteristics of patienis with primary progressive aphasia (PPA). Methods: Of 32 patients diagnosed as PPA in the Vlemorv Clinic of Tianjin Huanhu Hospital between April 2011 and October 2014, 16 patients with semantic dementia (SD), 15 patients with progressive non-fluent aphasia (...
Article
Background: Posterior cortical atrophy (PCA) is a kind of progressive neurodegenerative disease with cortical visual impairment as the first symptom. Because of rare clinical incidence, early onset age, special clinical symptoms and unobvious MRI abnormality, the definitive diagnosis of PCA is difficult. This study used 18F-fluoro-2-deoxy-D-glucose...
Article
With the great concerns on alleviating the pollution on the environment and traffic congestions; there is a trend for developing the electric vehicles [1], [2]. For such drive system, the in-wheel machines draw the main attention due to its relative higher torque density and compact structure [1]. With the permanent magnet (PM) located on the stato...
Article
By using the powder metallurgy technology and magnetic isotropy characteristic of the soft magnetic composite (SMC) material, various kinds of the complex structure permanent magnet synchronous machines (PMSMs) can be designed and fabricated easily e.g., axial-flux machine, claw pole machine (CPM) and transverse-flux machine (TFM) [1]-[4]. With the...
Article
The laser remanufacture is very important in the life-prolong of equipments. and the deformation caused by the course was small, discrete and non-linear. The deformation could affect the operating performance seriously, but meannhite it was hard to be measured accurately, which affected the process optimization and the forming evaluation. Aiming at...