Transfer System Research Articles

Applying BIM and pedestrian simulation for architectural flow line optimization in subway stations: an empirical analysis at Chongqing Ranjiaba Station

ABSTRACT In China’s new urbanization, urban rail transit has developed rapidly. Multiline subway stations in Chongqing face issues such as high passenger flow and intersecting pedestrian flows, leading to congestion, which affects station safety and service quality. This study aims to optimize subway station architectural flow lines, defined as pathways facilitating pedestrian movement within stations, to meet passenger demands, improve service quality, and contribute to smart city development. Combining BIM technology with pedestrian simulation, this research uses quantitative data analysis to optimize subway station flow lines under non-emergency conditions, a scenario rarely addressed in existing studies that focus on emergency evacuations, and proposes optimization strategies. We constructed an optimization framework based on BIM and pedestrian simulation and conducted an empirical study at Chongqing Ranjiaba Station to verify its feasibility. This research systematically examines subway station entry, exit, and transfer systems through literature reviews, surveys, simulations, and case studies. The analysis, within the context of smart city development and transit-oriented design, identifies issues in station layout and pedestrian flow, proposing and validating optimized design schemes. The study introduces a BIM-based framework for optimizing subway station flow lines, demonstrating improvements in pedestrian safety, operational efficiency, and user experience, offering practical solutions.

Local Polarization Piezoelectric Electric Field Promoted Water Dissociation for Hydroxyl Radical Generation under Ambient Humidity Condition.

Combining piezocatalysts with mechanical ball milling for dissociating water to generate hydroxyl radicals (·OH) offers unprecedented opportunities for energy conversion and environmental remediation. However, the in-depth insights into the relationship between water and local polarization piezoelectric electric field (LPPEF) are currently lacking, in particularly, the ·OH formation mechanism in ball milling driven piezocatalyst system is not systematically elucidated. To this end, the present work constructs a ball milling driven piezoelectric solid/liquid interface between piezoelectric Pb2B5O9Cl (PBOC) and different contents of water to investigate LPPEF initiated catalytic reaction. Results show that PBOC exhibits an excellent Tetrabromobisphenol A (TBBPA) degradation efficiency with a 68.94 and 12.43 times faster rate constant than traditional SiO2 and BaTiO3, respectively. Under ambient humidity condition, the lower energy barrier of water dissociation (0.23eV) endows ·OH generation more energetically favorable than under the water-oversaturated condition (0.66eV), and trace water magnifies the polarizability of [BO3] and [BO4] units in PBOC to initiate an enhanced LPPEF, thus it enhances the trapping of lone pairs electrons in trace adsorbed water by holes to contribute a higher yield of ·OH. This study constructs a highly correlated field-initiated electron transfer system that provides opportunities for promoting the performance of piezocatalytic materials.

Wireless power transfer empowered by reconfigurable intelligent surfaces

ABSTRACT Reconfigurable Intelligent Surfaces (RIS) represent a significant advancement in hardware technology, enhancing both wireless energy and spectral efficiency within wireless communication systems. Comprising a programmable metasurface, RIS can adeptly manipulate the wavefronts of incident signals – encompassing parameters such as phase, amplitude, frequency, and polarisation – without necessitating complex signal processing techniques. The integration of RIS into wireless communication networks enables the strategic manipulation of radio waves, thereby mitigating the adverse effects associated with natural wireless propagation. This study examines a multi-user (MU) multiple-input multiple-output (MIMO) wireless power transfer (WPT) system augmented by multiple RISs, wherein the transmitter is equipped with a constant-envelope beamformer. The optimisation of the phase shifts of the RIS and the beamformer of the transmitter is conducted jointly to maximise the total power received by users. An alternating optimisation approach is proposed, utilising the semidefinite relaxation (SDR) method. Additionally, a problem is formulated to maximise the total received power while adhering to constraints on the minimum power received by users, thereby addressing issues of user fairness. To resolve this problem, an iterative algorithm based on the Alternating Direction Method of Multipliers (ADMM) is introduced. Analysis and simulation results indicate a significant enhancement in total received power when employing the proposed methodology compared to existing algorithms documented in the literature. Furthermore, in scenarios involving multiple users, a detailed analysis of the system’s transmission performance, facilitated by RIS, is conducted. The numerical results substantiate the validity of the analysis and demonstrate the efficacy of the proposed algorithms.

Study on the construction of multi-level protection system for non-emergency transfer under the perspective of structuring

IntroductionThe non-emergency transfer multi-level protection system is a pivotal livelihood endeavor in China, serving as a vital diversified component within the robust framework of a Chinese-style modern social security system. This system faces various challenges, including displacement of emergency capacity by non-emergency demands, uneven allocation of transfer resources, service quality variations, inadequate management structures, limited regulatory frameworks, and social acceptance issues.MethodsLeveraging structural theory, this study analyzes the primary issues in the current implementation of China’s non-emergency transfer security system. A structured approach is employed to investigate these challenges and propose solutions.ResultsThe study identifies key areas for improvement in the non-emergency transfer security system. It highlights the need for an enhanced internal resource allocation mechanism to boost service efficiency, skilled workforce development to improve service quality, optimized management systems and coordination mechanisms to strengthen patient confidence in recovery, and strengthened comprehensive information technology management for market oversight.DiscussionThe proposed structured approach aims to foster sustainable development of the non-emergency transfer security system within a positive feedback loop. The recommendations aim to address the identified challenges and enhance the overall effectiveness of the system. By improving resource allocation, workforce skills, management systems, and information technology, the study suggests fostering deeper emotional engagement and connections, ultimately contributing to the system’s long-term success.

Ultrahigh-Selectivity Photocatalytic Upgrading of Bio-Aldehydes/Diols to Monoalcohols Via In Situ Circumventing Coupling Co-Products Over Janus Single-Atom Pd/TiO2.

Photocatalytic transfer hydrogenation of biomass-derived aldehydes to alcohols often results in unwanted coupling co-products. Herein, an ultraselective hydrogen transfer system enabled by in situ oxidative C─C bond cleavage over a Janus single-atom palladium on titanium dioxide (0.5Pd/TiO2) photocatalyst is presented. The TiO2 carrier promotes hydrogen-donor activation, while Pd single atoms function as both electron and hydrogen transfer centers, enabling photocatalytic conversion of bio-based furfural to furfuryl alcohol in >99% yield using ethanol as solvent/H-donor at 25°C. The control/in situ experiments and calculations reveal that ethanol on 0.5Pd/TiO2 preferentially activates a co-formed coupling by-product to undergo C─C bond cleavage followed by proton-coupled electron transfer, exclusively producing furfuryl alcohol. 0.5Pd/TiO2 with good reusability is applicable to hydrogenative upgrading of various aldehydes/diols into corresponding monoalcohols with 81‒99% yields. This in situ Janus photocatalytic conversion strategy offers a new approach to eliminate side reactions in reductive upgrading of unsaturated organics/biomass with high selectivity.

A design method to optimize GaN-based class E resonant inductive Wireless Power Transfer systems – application to non-mating connectors

A design method to optimize GaN-based class E resonant inductive Wireless Power Transfer systems – application to non-mating connectors

Design and Implementation of a Wireless Power Transfer System Using LCL Coupling Network with Inherent Constant-Current and Constant-Voltage Output for Battery Charging

The constant current followed by constant voltage (CC-CV) charging method is commonly employed for battery charging, effectively extending battery life and reducing charging time. However, as charging progresses, the battery’s internal resistance increases, complicating the charging circuit. This paper designs a wireless power transfer system utilizing an LCL coupling network for battery charging. The system employs frequency modulation (FM) to manage its CC and CV output characteristics at two fixed frequency points. The influence of the LCL coupling network parameters on system output characteristics was investigated using MATLAB. A simulation model was developed in the PSIM environment to validate the CC and CV output characteristics. The simulation results show that the system has load-independent constant-current and constant-voltage characteristics at two different frequency points. In order to verify the theoretical analysis, an experimental platform was also established. Experimental results demonstrate that the proposed system operates effectively in CC mode, maintaining constant output current across various loads, while in CV mode, it effectively regulates output voltage for different loads. The designed frequency modulation controller ensures a rapid response to sudden changes in load resistance, regardless of operating in CC or CV modes.

A design method to optimize GaN-based class E resonant inductive Wireless Power Transfer systems – application to non-mating connectors

Abstract Wireless Power Transfer (WPT) systems have demonstrated their efficiency over a broad frequency spectrum. However, the design and the optimization of multi-MHz frequency WPT systems remain complex due to parasitic components specifically. This paper outlines a methodology for designing and optimizing a compact 13.56 MHz resonant inductive coupling WPT systems based on a GaN Class E inverter. The proposed design approach combines analytical modeling and advanced numerical simulations taking into account parasitic elements. The effectiveness of this approach is experimentally confirmed through a prototype, which shows an efficiency of 78% for a transmitted power of 43 W to a 5.54 cm³ coupler. The advanced modeling results perfectly match with the experimental ones (mismatch of only 2% for the evaluation of efficiency). The WPT system developed thanks to this method shows a power density among the highest ones in the non-mating connectors’ state of the art.

A Coil With All‐Plane High Misalignment Tolerance for Wireless Power Transfer

ABSTRACTThe output voltage of a magnetically resonance‐coupled wireless power transfer (WPT) system is very sensitive to the coil alignment. In this paper, a novel quadrupole coil structure as a receiving coil for static charging of automated guided vehicles (AGVs) is proposed to improve the mutual inductance profile under XOY plane misalignment conditions during AGV charging. The enhanced coil structure effectively reduces the output power and voltage fluctuations. An experimental prototype is established to validate the feasibility of the proposed WPT system. The experimental results show that the output voltage fluctuation is only 10.85% over a 77.78% coil area offset area covering the whole charging plane.

Research on the High-Efficiency Wireless Bidirectional Charging and Discharging System for Electric Vehicles Based on the LCC-S Compensation Network

In response to the existing issues of poor anti-offset performance and insufficient width of the matchable voltage range at the DC end in the current bidirectional wireless power transfer (BWPT) system for electric vehicles, an efficient wireless bidirectional charging and discharging system for electric vehicles based on the LCC-S compensation network is proposed. Compared with the topological structure of the traditional two-stage wireless bidirectional charging and discharging system, this system adds a DC-DC module in the on-board equipment, while the BWPT link adopts the LCC-S compensation topology. Moreover, this system realizes DC side voltage matching and transmission power regulation through the DC converter on the vehicle side. Under the premise of no control-level data communication between the primary and secondary sides, it achieves efficient, stable and reliable wireless bidirectional charging and discharging control. Finally, the working characteristics of the proposed system are tested through experiments. The results indicate that the system can maintain efficient, stable and reliable bidirectional operation under the conditions of a large offset range and wide voltage range at the DC side

A CRISPR-Cas9 system protecting E.coli against acquisition of antibiotic resistance genes

Antimicrobial resistance (AMR) is an increasing problem worldwide, and new treatment options for bacterial infections are direly needed. Engineered probiotics show strong potential in treating or preventing bacterial infections. However, one concern with the use of live bacteria is the risk of the bacteria acquiring genes encoding for AMR or virulence factors through horizontal gene transfer (HGT), and the transformation of the probiotic into a superbug. Therefore, we developed an engineered CRISPR-Cas9 system that protects bacteria from horizontal gene transfer. We synthesized a CRISPR locus targeting eight AMR genes and cloned this with the Cas9 and transacting tracrRNA on a medium copy plasmid. We next evaluated the efficiency of the system to block HGT through transformation, transduction, and conjugation. Our results show that expression of the CRISPR-Cas9 system successfully protects E. coli MG1655 from acquiring the targeted resistance genes by transformation or transduction with 2–3 logs of protection depending on the system for transfer and the target gene. Furthermore, we show that the system blocks conjugation of a set of clinical plasmids, and that the system is also able to protect the probiotic bacterium E. coli Nissle 1917 from acquiring AMR genes.

Bioinformatics analysis of mitochondrial metabolism-related genes demonstrates their importance in renal cell carcinoma

PurposeClear cell renal cell carcinoma (ccRCC) is resistant to radiotherapy and chemotherapy. Thus, it is necessary to find new diagnostic markers and therapeutic targets to increase the overall outcomes of ccRCC. Recent studies have shown that therapeutic methods that interfere with the energy transfer system can also positively affect the treatment process.MethodsThe present study is focused on finding markers associated with mitochondrial metabolic pathways that affect the outcome of ccRCC. For this purpose, we investigated various aspects of the relationship between mitochondrial metabolism and ccRCC based on analysis of gene network connections and differentially expressed genes, through assessment of protein–protein interaction, mutations, and promoter methylation on the related genes. We also investigated gene interaction with miRNAs and immune infiltration analysis.ResultsThrough these steps, we provided a list of possible diagnostic markers and therapeutic targets for ccRCC.ConclusionThe current study further proved the importance of mitochondrial metabolic pathways in the pathogenesis of ccRCC and provided a list of possible diagnostic markers and therapeutic targets from these pathways that can be used in ccRCC.

Photo-Controllable Förster Resonance Energy Transfer Based on Dynamic Chiral Self-Assembly of Sequence-Defined Amphiphilic Alternating Azopeptoids.

Endowing biomimetic sequence-controlled polymers with chiral functionality to construct stimuli-responsive chiral materials offers a promising approach for innovative chiroptical switch, but it remains challenging. Herein, it is reported that the self-assembly of sequence-defined chiral amphiphilic alternating azopeptoids to generate photo-responsive and ultrathin bilayer peptoidosomes with a vesicular thickness of ≈1.50nm and a diameter of around ≈290nm. The photoisomerization of azobenzene moiety facilitates a reversible structural transformation from isotropic peptoidosomes to anisotropic 1D helical nanoribbons (≈80nm width) under the alternating irradiation with UV and visible lights, consequently leading to the chirality expression and transfer from chiral asymmetric center to achiral azobenzene units. As a biomimetic model with deformation-induced energy transfer, a non-invasive azobenzene-based Förster resonance energy transfer system is unprecedentedly constructed via the introduction of a fluorescent donor of pyrene derivatives and sequentially photo-regulated the donor/acceptor ratio, displaying a reversible gradient fluorescent color variation from blue to yellow (a broad Stokes shift of ≈200nm) and a high-efficient energy transfer efficiency of 97.2%. The photo-controllable photoluminescence phenomenon endows these chiral aggregates with a proof-of-concept application on multi-colored information encryption. This work provides a prospective strategy to fabricate stimuli-responsive chiral biomimetic materials with a potential on the light-controllable switches.

Preexisting vaccine-primed heterosubtypic T cell immunity protects the maternal-fetal unit from adverse influenza outcomes in mice.

The risk of severe outcomes of influenza increases during pregnancy. Whether vaccine-induced T cell memory-primed prepregnancy retains the ability to mediate protection during pregnancy, when systemic levels of several hormones with putative immunomodulatory functions are increased, is unknown. Here, using murine adoptive transfer systems and a translationally relevant model of cold-adapted live-attenuated influenza A virus vaccination, we show that preexisting virus-specific memory T cell responses are largely unaltered and highly protective against heterotypic viral challenges during pregnancy. Expression of the transcription factor T-bet, which is upregulated in antiviral T cells responding in pregnant mice, is critical in preventing hormone-associated gain of detrimental T helper type 2 (TH2) attributes reported in other settings. Beyond antiviral effects, preexisting vaccine-primed T cell immunity prevents metabolic dysfunction in gravid dams and adverse neonatal outcomes often associated with maternal influenza infection. These results demonstrate robust protection of the maternal-fetal unit from severe consequences of respiratory virus infection by preexisting T cell immunity.

National-Scale Optimized Design of Cost-Effective Water Supply and Transfer Systems

National-Scale Optimized Design of Cost-Effective Water Supply and Transfer Systems

Investigation of asymmetric heating in Poiseuille-Rayleigh-Bénard water flow: A numerical study

In this paper, a numerical investigation of the impact of asymmetric heating on laminar mixed convection in Poiseuille-Rayleigh-Bénard water flow within parallel horizontal channels is presented. The study has been carried out in a rectangular channel with a transverse aspect ratio of 10, and considered both low (Ra = 1.28 × 104) and high (Ra = 1.4 × 105) Rayleigh numbers, with Reynolds numbers of 50 and 100. A uniform heat flux was applied to the top and bottom walls of the heated region to assess its effect on the system's thermoconvective behavior and heat transfer efficiency. Two flux ratio scenarios were considered: qt/qb = 1 and qt/qb = 2.The results indicate that increasing the flux ratio intensifies the destabilizing temperature gradient and significantly enhances buoyancy-induced flow, thereby influencing the patterns of thermoconvective structures. Specifically, flux ratios lead to an increased number of plumes originating from the bottom of the channel, while reducing their height and confining them between the bottom wall and the upper thermal boundary layer. It is also observed that flux ratios do not affect the mechanisms involved in the formation of longitudinal rolls. Furthermore, at low Rayleigh numbers, asymmetric heating has a pronounced impact on the establishment length. In contrast, this effect diminishes and becomes negligible at higher Rayleigh numbers. Numerical computations further reveal that near the bottom wall, the Nusselt number exhibits singular behavior, approaching infinity. Regardless of Reynolds and Rayleigh numbers, flux ratios significantly enhance heat transfer within the system. Additionally, near the top wall, the buoyancy effects from the bottom wall have negligible impact on heat transfer, except in the case where qt/qb = 2, Re = 50 and Ra = 1.4 × 105, where instability in the upper thermal layer was observed.

Various Techniques for Charging Lithium-Ion Batteries in Electric Vehicles Using Wireless Power Transfer Chargers

Precise voltage and current regulation is essential to ensure the required power output and maximum efficiency in charging stations, particularly those utilizing Wireless Power Transfer (WPT) systems. Effective regulation techniques are necessary to manage voltage and current in Battery Electric Vehicles (BEVs) operating under various charging modes. This study outlines the controller design for different methods for charging lithium-ion batteries in a WPT charger. Initially, the fundamental concepts of WPT systems and their equivalent circuit are introduced. Subsequently, the control strategy for current regulation is detailed for the Constant Current (CC) mode, the Multi-stage Current Method (MCM), and the Pulse Charging Method (PCM). Finally, the resilience and validity of this innovative approach to controlling various techniques for charging lithium-ion batteries are demonstrated through simulations.

Terrace-Shaped Core Design Method for Inductive Power Transfer System Considering Uniform Magnetic Flux Distribution

Terrace-Shaped Core Design Method for Inductive Power Transfer System Considering Uniform Magnetic Flux Distribution

5-kW, 96.5% Efficiency Capacitive Power Transfer System With a Five-Plate Coupler: Design and Optimization

5-kW, 96.5% Efficiency Capacitive Power Transfer System With a Five-Plate Coupler: Design and Optimization

Mixed-Dimensional Nanofluids: Synergistic Thermal Enhancement Using 2D and 1D Materials

Excessive heat generation is a common problem in automobiles due to wear and tear of working parts. A suitable heat transfer system is required to avoid stalling automobiles due to the large quantity of heat generated. Liquids like water and ethylene glycol (EG) serve as a coolant by reducing generated heat. To further increase the effectiveness of these coolants, nanofluids which contain nanosized particles dispersed in base fluid like water, ethylene glycol, or a mixture of these two, can be used. In the present work, hybrid nanofluids using Ti3C2 (MXene) (2D) and functionalized multi-wall carbon nanotubes (F-MWCNTs) (1D) nanocomposites are prepared. The prepared material is characterized using X-ray diffraction (XRD) for structural analysis, field emission scanning electron microscopy (FESEM), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HR-TEM) with energy dispersive X-ray analysis (EDAX) for morphological and elemental analysis, and Fourier transform infrared spectroscopy (FTIR) for identifying functional groups. The suitability of the prepared nanofluids is tested for heat transfer application by measuring the thermal conductivity and viscosity. The long-term stability of the nanofluids is verified by zeta potential measurement. The addition of the dispersant to the water has shown an enhanced thermal conductivity (about 10.83% at room temperature and 96.76% at 50 °C) while having lower viscosity compared to the base fluid (water), confirming the suitability for heat transfer applications.