Wenjiang Yang

Beihang University | BUAA · School of Astronautics

This paper presents a cryogenic turbo-electric hybrid propulsion system (TEHPS) for a 70-80 seat class turboprop regional aircraft, integrating superconducting technology with liquid hydrogen (LH2) cooling. LH2 is selected as the cooling medium for the designed cryogenic cooling circuit, and the evaporated hydrogen gas is channeled to a hydrogen fu...

Benefiting from the high critical current density (Jc), single-grain (RE)BCO (where RE = rare earth or Gd) bulks are capable of trapping over 17.6 T magnetic field which is crucial for the application of bulk superconductors. Nevertheless, during field cooling magnetization (FCM), the large mechanical stress induced by Lorentz forces may lead to fr...

As the aviation industry seeks sustainable propulsion solutions, innovative technologies have emerged, among which rim-driven fan (RDF) systems hold notable promise. This comprehensive review paper deeply investigates RDF technology, uncovering its principles, benefits, and transformative potential for aviation propulsion. Amid escalating concerns...

Hybrid-electric propulsion system (HEPS) has gained significant attention in unmanned aerial vehicles (UAVs) due to its potential to significantly reduce fuel consumption and pollutant emissions. Effective energy management strategies are crucial in ensuring the efficient operation of HEPS in UAVs, as they involve multiple power and energy sources....

The diamagnetic levitation technique can be applied in non-destructive testing for identifying cracks and defects in magnetic materials. Pyrolytic graphite is a material that can be leveraged in micromachines due to its no-power diamagnetic levitation on a permanent magnet (PM) array. However, the damping force applied to pyrolytic graphite prevent...

The diamagnetic levitation technique can be applied to non-destructive testing for identifying cracks and defects in magnetic materials. Pyrolytic graphite is a material that can be leveraged in micromachines due to its no-power diamagnetic levitation on a permanent magnet (PM) array. However, the damping force applied to pyrolytic graphite prevent...

In pulsed field magnetization (PFM), the phenomenon of flux jump is capable of driving magnetic flux vortexes into GdBCO superconducting bulk center to aid full magnetization. Varieties of homogeneous critical current density (Jc) models have been implemented to reproduce flux jumps, but simulated multi-physical responses differ from experimental o...

Multimodal imaging has become a trend in the development of molecular imaging. For SPECT/MRI dual-modality imaging, we developed a SPECT/MRI dual-modality probe based on superparamagnetic iron oxide nanoparticles. RGDyk peptide and DTPA chelator were used to realize the functionalization of nanoparticles. Both SPECT imaging and T2-weighted MR imagi...

In the application of the Superconducting AC homopolar machines(SAHM), HTS exciting windings carry DC currents under external AC magnetic fields, and generally cause dynamic loss and magnetization loss, which will deteriorate the stable operation of SAHM. The conductor on round core (CORC) cables is a promising choice for HTS exciting windings beca...

High-temperature superconducting (HTS) rare-earth barium copper oxide (REBCO) coated conductors with outstanding critical current density under high fields can help realize a high-field path toward magnetic-confinement fusion. REBCO cabling methods such as conductor on round core (CORC) cables, twisted stacked tape conductor (TSTC) cables, and Ruth...

The development of rare-earth barium copper oxide (REBCO) coated conductors with an extremely high critical current density under ultra-high fields opens up a high-field path towards large-scale fusion. The latest technology has inspired cable-in-conduit conductors (CICC) such as conductor on round core (CORC) wires, twisted stacked tape conductor...

This paper proposes a distributed turbo-electric hybrid propulsion system (TEHPS) architecture for high-power and large-load air–ground aircraft (AGA). The composition of the turboshaft engine, hybrid energy storage system (HESS) as the power unit, distributed electric drive ducted fans, and wheels as the propulsion unit is determined. Firstly, the...

Benefited from the combination of Messiner effect and flux pinning, a permanent magnet (PM) can give the self-stable levitation above a bulk superconductor. The phenomenon provides the basic principle of superconductors in wide applications such as HTS maglev trains and superconducting flywheel systems. When the superconductor works under some cond...

Benefited from the good structural characteristics and thermal dissipation ability, high temperature superconductor (HTS) stacks are becoming more and more popular in superconducting applications, and can achieve a better performance with relatively few superconducting materials compered with the HTS bulk. However, due to the high aspect ratio of H...

Multifunctional high boron content MOFs nano-co-crystals were assembled and architected for precise boron neutron capture therapy (BNCT) of brain glioma. Zirconium and mesotetra(4-carboxyphenyl)porphyrin are screened and determined to structure stable (Zr-TCPP) MOFs. The MOFs binding boron acids formed 100.20 ± 6.72 nm co-crystal structures (MNCs),...

Abstract: Superconducting machine has a wide range of application prospects in aviation electric propulsion due to its advantages such as small size, high power density and high efficiency. The characteristics and current situation of superconducting pure/hybrid electric drive system for high power aviation electric propulsion were compared and a...

High-temperature superconductors show great potential in power applications, but AC loss limits their large-scale application in industry. Therefore, accurate and real-time assessment of AC loss is important. In this thesis, a review of researches on fast AC loss measurements was presented. A digital compensation technique based on the compensation...

The molten salt reactor which normally uses fluoride salts, chlorides and potassium salts as fuel and coolant has advantages in operation sustainability, economic value and security. It is regarded as an advanced nuclear reactor and is currently under development and design. One of the challenging issues for the reactor is their pumping system. Cha...

Superconductors have great advantages in power applications and it is of great significance for rapid measurement and real-time monitoring of AC loss. In this paper, a straightforward electrometric method for measuring AC loss was developed. The measurement method uses a high precision data acquisition (DAQ) device and an algorithm program based on...

The concept of the high temperature superconducting (HTS) twisted stacked tape conductor (TSTC) cable for fusion has been developed during recent years. The cable is demonstrated to have a stable cable critical current under extreme trial conditions with high electromagnetic force levels and multiple cryogenic thermal cycles. The remaining question...

High temperature superconducting (HTS) machine has a broad application prospect in the electric aircraft field, because of its high efficiency and power density property. Especially when the homopolar inductor rotor was used in the HTS generator, its stationary HTS field winding brings great advantages of simplicity and reliability. However, the re...

High temperature superconducting (HTS) machine has a broad application prospect in the airborne electric power system, because of its non-resistance, lightweight, and small size property. Especially when the homopolar inductor rotor was used in the HTS generator, it will also have a simple structure but high working speed which means powerful outpu...

Molten salt reactors have the potential to be employed as the power system for space exploration machines due to their advantage in the scale and power density. One essential technology associated with the reactor is the pump which circulating molten salts. Since the electric resistivity of molten salts is three orders of magnitude higher than ordi...

High-temperature superconducting (HTS) tape stacks have broad applications in magnetic levitation because of the uniform induced current distribution, good heat dissipation, and preferable mechanical properties. Configuration of the stack is one of the primary factors on the uniformity and strength of the trapped magnetic field. In this paper, the...

Traditional photodynamic therapy requires external light excitation to produce reactive oxygen species (ROSs) for treatment of tumor. Due to problems of light penetration, traditional PDT is limited by location and depth of tumor. In this study, we rationally designed and constructed a novel strategy to amplify the therapeutic effect of PDT. We pre...

The rapid development of industry results in large energy consumption and a negative impact on the environment. Pollution of the environment caused by conventional energy sources such as petrol leads to increased demand for propulsion systems with higher efficiency and capable of energy-saving and emission reduction. The usage of hybrid technology...

This work reports the synthesis, radiolabeling and imaging studies of iodine-124 labeled peptide modified gold nanoclusters (AuNCs) as positron emission tomography (PET) tracer for lung cancer. The novel modified Au nanoclusters were successfully synthesized by conjugation of tumortargeting peptide luteinizing hormone releasing hormone (LHRH) to hu...

Accurate diagnosis of cancer at an early stage is the key to reduce cancer mortality and improve survival. PET imaging has high sensitivity but low spatial resolution, while CT imaging has good spatial location information. Therefore, the combination of PET and CT imaging can provide complementary advantages to achieve accurate early diagnosis of t...

This work highlights the superiority of surface-radiolabeling strategy over core-labeling strategy in the assembly of radioactive, iron oxide nanoparticles (IONPs) based nanocomposites for multimodal imaging and targeted therapy. It also...

The level of fault current is also enlarged against ca-pacity of conventional circuit break in some urban power grids with the rapid increase of power load. Thus, high temperature su-perconducting fault current limiter (HT SFCL) has been suggested to provide effective and reliable protection of power devices against fault currents. This paper deals...

Induction coilgun can accelerate a high-temperature superconductor (HTS) projectile to higher velocity than a conventional projectile, because an HTS projectile can generate greater induced current by the premagnetized process and then obtain larger thrust in the launch process. In this paper, a numerical field model for the dynamic and electromagn...

Since higherature superconducting (HTS) cables have attracted significant attention for their low losses (30% of normal power cable), large capacity, and small size, they can be used for electric power transmission for efficient use of energy in power systems. However, they are often subjected to overcurrent impact caused by a short-circuit fault w...

Under the condition of field-cooling magnetization, the superconductor can trap magnetic flux and form a self-stabilizing state within it because of the flux-pinning effect. In most cases, the superconductor interacts with a magnet that is also used to magnetize the superconductor, and then, some self-stabilizing structure such as the magnet-superc...

High temperature superconducting (HTS) cable is a new development of applying superconducting technology in power system. AC loss measurement technology is a key factor in designing HTS cable as it decides the stability and operating cost of the cable. In this paper, a novel AC loss measurement technology for HTS cable is proposed based on LabVIEW....

Eddy loss caused by the ununiformed magnetizing field of high temperature superconductor (HTS), which is field cooled by a permanent magnet (PM), is one of the main losses in the rotating superconducting suspension. Due to the incompletely symmetrical magnetic field of PM and the anisotropy magnetization in HTS, there should be an optimal field coo...

Positron emission tomography (PET) imaging has received special attention owing to their higher sensitivity and spatial resolution, unlimited tissue penetration. The development of tracers that target specific molecular is therefore essential for the development and utility of clinically relevant PET procedures. However, 64Cu as PET imaging agents...

In order to develop a novel 99mTc-labeled folate based SPECT radiotracer with an optimized pharmacokinetic profile for the folate receptor (FR) positive tumor imaging, a folate conjugate, HYNIC-PEG2-FA, was designed, synthesized and radiolabeled with 99mTc using tricine/diphenylphosphinobenzene-3-sulfonic acid sodium (TPPMS), tricine/trisodium trip...

This work reports the synthesis, radiolabeling and preliminary biodistribution results in tumor-bearing mice of 99mTc(CO)3-labeled pegylated (PEG) 2-nitroimidazoles for tumor hypoxia imaging. The novel 2-nitroimidazole derivatives were successfully synthesized by conjugation of tridendate chelators to 2-nitroimidazole via PEG3 linker. Radiolabeling...

Lipophilic cations such as phosphonium salts can accumulate in mitochondria of heart in response to the negative inner-transmembrane potentials. Two phosphonium salts [18F]FMBTP and [18F]mFMBTP were prepared and evaluated as potential myocardial perfusion imaging (MPI) agents in this study. The cations were radiolabeled via simplified One-Pot metho...

Flux-pinned interaction between high T c superconductors (HTSs) and an applied magnetic field provides a new, no-contact interface approach that can be used in docking and assembling process of space module systems. Unlike operations on the Earth, the magnetization of the HTS happens in orbit which differs from the traditional field cooling (FC) ma...

The number of Asialoglycoprotein (ASGP) receptors on the hepatocytes of patients with liver disease is reduced and is thus considered a good indicator for the evaluation of liver function. ASGP receptor-targeted radiopharmaceuticals permit a non-invasive way to evaluate total and regional hepatic function and hepatic functional reserve visually and...

Design of a thrust stand is crucial for evaluating electric propulsion performance. In order to prevent connecting interferences and bring higher precision, a thrust measuring method using superconducting magnetic levitation is proposed to be applied in the micro-thrust measurement to achieve a fully suspending thrust stand. The principle of superc...

Diethylenetriaminepentaacetic acid neolactosyl human serum albumin (DTPA-LSA) was prepared and labeled with technetium-99m. The labeling conditions of (99m)Tc-DTPA-LSA were optimized, and lyophilized kit was developed for instant preparing of (99m)Tc-DTPA-LSA. (99m)Tc-DTPA-LSA showed high liver uptake in normal mice (>96% ID/g at 5min after injecti...

The chlorambucil l-histidine conjugate was synthesized and radiolabeled with [99mTc(CO)3]+ core to form the 99mTc(CO)3(His–CB) complex. The radiochemical purity of the complex was over 90%. It had good hydrophilicity and was stable at room temperature. The high initial tumor uptake with certain retention, fast clearance from background, good tumor/...

Due to the zero gravity environment in space, the docking and assembling of space systems in orbit present many challenges, which are often overcome by approaches that depend on adapting interface structures and techniques. By using the trapped magnetic flux in high temperature superconductors (HTSs), the flux-pinned interaction between the HTS and...

Three chemical modification methods of carboxymethylation, quaternization and hydroxypropylation were used to synthesize water-soluble chitosan derivatives. In order to study the feasibility of these chitosan derivatives as backbones of nuclear imaging agents, folic acid (FA) and Technetium-99m were introduced onto the water-soluble chitosan chains...

The feasibility of chitosan (CS) as a backbone for the design of (99m)Tc-labeled targeting agent was evaluated in this study. Chitosan-folate conjugate (CSFA) and chitosan-folate dithiocarbamate (CSFADTC) were synthesized, characterized and radiolabeled with (99m)Tc as model compounds for folate-receptor (FR) targeting. (99m)Tc-complexes were prepa...

The (2-methoxyphenyl) piperazine (MPP) was selected as the functional group and conjugated to dithiocarbamate through different spacers. A series of new MPP derivatives (MPPnDTC, n = 2–6) were synthesized and radiolabelled with 99mTc-nitrido core or 99mTc-tricarboxyl core as potential -HT1A receptor imaging agents. All the six 99mTc-labelled comple...

Poly(vinylbenzyl-O-β-D-galactopyranosyl-D-gluconamide) (PVLA) can be specifically internalized by hepatocytes via the asialoglycoprotein receptor. In this study, we synthesized and characterized galactose-carrying copolymers with hydrazinonicotinamide chains as bifunctional groups to radiolabel PVLA with (99m)Tc for SPECT targeting specific hepatoc...

Rare-earth-based nanoparticles have attracted increasing attention for their unique optical and magnetic properties. However, their application in bioimaging has been limited to photoluminescence bioimaging and magnetic resonance imaging. To facilitate their use in other bioimaging techniques, we developed a simple, rapid, efficient and general syn...

Galactosylated chitosan (GC) was prepared by reacting lactobionic acid with water-soluble chitosan. GC was labeled with fluorine-18 by conjugation with N-succinimidyl-4-(18)F-fluorobenzoate ([(18)F]SFB) under a slightly basic condition. After rapid purification with HiTrap desalting column, [(18)F]FB-GC was obtained with high radiochemical purity (...

Compared to currently used chemical boosters or mechanical devices, electromagnetic catapults have special advantages on multiple acceleration profiles and highly variable velocity, which are attractive for launching unmanned air vehicles (UAVs) in several hundred kilogram range. A linear motor is usually designed as the thrust producer of the elec...

Unlabelled: Myocardial extractions of pyridaben, a mitochondrial complex I (MC-I) inhibitor, is well correlated with blood flow. Based on the synthesis and characterization of pyridaben analogue 2-tert-butyl-5-[2-(2-[(18)F]fluroethoxy)ethoxy]benzyloxy]-4-chloro-2H-pyridazin-3-one ([(18)F]FP2OP), this study assessed its potential to be developed as...

This study reports the synthesis and characterization of N-(3-(4-(2-methoxyphenyl)piperazin-1-yl)propyl-4-[(18)F]fluorobenzamide ([(18)F]MPP3F). The total reaction time for [(18)F]MPP3F, including final high-performance liquid chromatography purification, was about 3h. Typical decay-corrected radiochemical yield was 18.4+/-3.1%. The radiochemical p...

Asialoglycoprotein receptors (ASGP-R) are well known to exist on the mammalian liver, situate on the surface of hepatocyte membrane. Quantitative imaging of asialoglycoprotein receptors could estimate the function of the liver. (99m)Tc labeled galactosyl-neoglycoalbumin (NGA) and diethylenetriaminepentaacetic acid galactosyl human serum albumin (GS...

A novel bifunctional coupling agents-biomolecular compound DMP-NGA was prepared by coupling the SATP with galactosyl-neoglycoalbumin (NGA). The DMP-NGA was labeled with technetium-99m, and the radiochemical purity in excess of 98% after purified with HPLC. In vivo biodistribution showed that (99m)Tc-DMP-NGA had very high initial liver uptake with g...

In this paper, we present a simulation process of the melt-texture YBCO high-temperature superconductor (HTS) bulk levitated over the permanent-magnet (PM) guideway, and further experiment also been built to analyze the dynamic behavior of HTS. The relation between suspension force and amplitude of the levitation system under single-degree of freed...

In order to investigate the feasible application of a high-T_c superconducting (HTS) levitation system to a maglev train or a space vehicle launcher, we construct a demonstration maglev test vehicle consisting of two linear permanent magnets (PM) guideways and a test levitator with multi-block melt-processed YBaCuO superconductors. By usi...

In order to investigate the feasible application of a permanent magnet–high-temperature superconductor (PM–HTS) interaction maglev system to a maglev train or a space vehicle launcher, we have constructed a demonstration maglev test vehicle. The force dissipation and damping of the maglev vehicle against external disturbances are studied in a wide...

Magnetic levitation technology, having the characteristics of low cost and high quality, has been considered a preferable option for the next generation of launcher systems. A world-wide research design on the conceptual level has been carried out on the highly reusable space transportation systems by applying magnetic levitation to the launch assi...

Maglev launch assist is viewed as an effective method to reduce the cost of space launch. The primary aerodynamic characteristics of the Maglev launch vehicle and the space vehicle are discussed by analyzing their aerodynamic shapes and testing a scale mode in a standard wind tunnel. After analyzing several popular Maglev systems, we present a no-c...

The goal of this study is to develop a novel 5-HT(1A) receptor imaging agent. 4-[(2-methoxyphenyl)piperazin-1-yl]-dithioformate (MPPDTF) was labeled with (99m)Tc-tricarbonyl core via dithioformate moiety in high yield (>96% by HPLC). (99m)Tc(CO)(3)-MPPDTF is a neutral and lipophilic complex, which was confirmed by paper electrophoresis and octanol/...

With the aim of finding a low-cost, safe, and reliable way to reduce costs of space launch, a maglev launch assist vehicle (Maglifter) is proposed. We present a permanent magnet–high temperature superconductor (PM-HTS) interaction maglev system for the Maglifter, which consists of a cryostat with multi-block YBaCuO bulks and a flux-collecting PM gu...

In this paper, we present a study of the quasi-static and dynamic behaviour of high-Tc superconductors (HTS hereafter) using a model suspension vibration testing system based on the magnetic launch assistance concept. The stiffness and damping of the levitation system under specified vibration circumstances was calculated by drawing on harmonic res...