The Pareto Optimal Control of Inverter based on Multi-objective Immune Algorithm

Jiaxin Yuan,Gang Xue,Zhen Zhao,Baichao Chen 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

In this paper, an immune-algorithm-based PARETO optimal control strategy is proposed for multi-objective optimization of the output waveform quality and switching loss of a single-phase inverter. A picture of the relationship between the waveform quality and switching losses in the form of the Pareto frontier is plotted, forming an optimal Pareto optimal solution set in different inductive load. The calculation of the switching loss relies on the following factors: data sheet providing the characteristic parameters of the devices, load current (collector current), the switching gate signal and the DC bus voltage. Finally, the experimental platform based on DSP+FPGA as the core control system is established and adequate experiments are carried out, using the Holzer current sensor to collect the inverter output current signal and the thermistor PT100 to indirectly measure the switching loss of the inverter. Simulation and experimental data show that the method is feasible and effective.

β-Cyclodextrin functionalized magnetic nanoparticles for the removal of pharmaceutical residues in drinking water

Jiaxin Xu,Yuan Tian,Zibiao Li,Beng Hoon Tan,Karen Yuanting Tang,Kam Chiu Tam 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

Trace amounts of pharmaceuticals and personal care products (PPCPs) are found in our water systems,and they are known to have adverse effects on wildlife and human at the ng/L to lg/L range, belowthe detection limit of most water analytical instruments. Methacrylate acid (MAA)-ethyl acrylate (EA)colloidal scaffolds were prepared via emulsion polymerization and used as templates for the in-situco-precipitation of Fe2+ to produce stable functional magnetic nanoparticles (MNPs) (<500 nm) decoratedwith b-cyclodextrin (b-CD) (FMNP). Emulsion polymerization with the controlled addition of monomermixtures allowed for good size control, and silica coating was introduced to prevent the oxidation ofFMNP. The superparamagnetic FMNP with high saturation magnetization (33 emu/g) could be readilyseparated from water using a high gradient magnetic separator (HGMS). Procaine hydrochloride (PrHy)was used as a model pharmaceutical residue to evaluate the performance of the FMNP, and 53.65 mgPrHy/g FMNP was absorbed using 600 ppm FMNP. A fast (30 min) adsorption kinetic follows thePseudo-first-order kinetic model that described the physical adsorption through a 1 to 1 host–guestinclusion mechanism. And the adsorption behavior followed the Freundlich isotherm with a linearadsorption performance. The proposed system is scalable and adaptable to existing water treatment processes,and it can be used for the detection of low concentration pharmaceuticals via a pre-concentratingstrategy.

De novo transcriptome sequencing of marine-derived Aspergillus glaucus and comparative analysis of metabolic and developmental variations in response to salt stress

Shaomei Liu,Jiaxin Li,Yuan Wu,Yanna Ren,Qi Liu,Qiyao Wang,Xiangshan Zhou,Menghao Cai,Yuanxing Zhang 한국유전학회 2017 Genes & Genomics Vol.39 No.3

Aspergillus glaucus HB1-19 is a typical marinederived fungus preferring the dependence on sea water for its growth, asexual development and polyketides biosynthesis. Therein, salt stress greatly functions even in superior to light illumination, which is also a critical regulation signal for fungi. Here, comparative RNA-seq analysis of this strain was performed under conditions of saltstress ? dark (group A), non salt-stress ? dark (group B), salt-stress ? light (group C). The RNA-seq generated a total of 19,024 unigenes with an average length of 1415 bp. Differentially expressed genes were very similar between group A and group C but greatly differed between group A and group B, proving that salt stress functioned superior to light illumination globally. Salt stress highly enhanced primary metabolism and activated Ras and MAPK signaling pathways. There seems no direct interaction between asexual development and polyketides biosynthesis. Salt stress inhibited terpenoids biosynthesis but showed little influences on polyketide pathway as well as other secondary metabolism pathways. These findings provide a better understanding of marine fungi adapting to marine environment. Also, it indicates that the so-called ‘salt stress-induced’ may truly be a ‘metal ions-induced’ for biosynthesis of secondary metabolites in marine fungi.

Static performance of a new GFRP–metal string truss bridge subjected to unsymmetrical loads

Dongdong Zhang,Jiaxin Yuan,Qilin Zhao,Feng Li,Yifeng Gao,Ruijie Zhu,Zhiqin Zhao 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.5

A unique lightweight string truss deployable bridge assembled by thin-walled fiber reinforced polymer (FRP) and metal profiles was designed for emergency applications. As a new structure, investigations into the static structural performance under the serviceability limit state are desired for examining the structural integrity of the developed bridge when subjected to unsymmetrical loadings characterized by combined torsion and bending. In this study, a full-scale experimental inspection was conducted on a fabricated bridge, and the combined flexural–torsional behavior was examined in terms of displacement and strains. The experimental structure showed favorable strength and rigidity performances to function as deployable bridge under unsymmetrical loading conditions and should be designed in accordance with the stiffness criterion, the same as that under symmetrical loads. In addition, a finite element model (FEM) with a simple modeling process, which considered the multi segments of the FRP members and realistic nodal stiffness of the complex unique hybrid nodal joints, was constructed and compared against experiments, demonstrating good agreement. A FEM-based numerical analysis was thereafter performed to explore the effect of the change in elastic modulus of different FRP elements on the static deformation of the bridge. The results confirmed that the change in elastic modulus of different types of FRP element members caused remarkable differences on the bending and torsional stiffness of the hybrid bridge. The global stiffness of such a unique bridge can be significantly enhanced by redesigning the critical lower string pull bars using designable FRP profiles with high elastic modulus.

Diabetes Mellitus and Cause-Specific Mortality: A Population-Based Study

Sen Li,Jiaxin Wang,Biao Zhang,Xinyi Li,Yuan Liu 대한당뇨병학회 2019 Diabetes and Metabolism Journal Vol.43 No.3

Background: To investigate whether diabetes contributes to mortality for major types of diseases. Methods: Six National Health and Nutrition Examination Survey data cycles (1999 to 2000, 2001 to 2002, 2003 to 2004, 2005 to 2006, 2007 to 2008, and 2009 to 2010) and their linked mortality files were used. A population of 15,513 participants was included according to the availability of diabetes and mortality status. Results: Participants with diabetes tended to have higher all-cause mortality and mortality due to cardiovascular disease, cancer, chronic lower respiratory diseases, cerebrovascular disease, influenza and pneumonia, and kidney disease. Confounder-adjusted Cox proportional hazard models showed that both diagnosed diabetes category (yes or no) and diabetes status (diabetes, prediabetes, or no diabetes) were associated with all-cause mortality and with mortality due to cardiovascular disease, chronic lower respiratory diseases, influenza and pneumonia, and kidney disease. No associations were found for cancer-, accidents-, or Alzheimer’s disease-related mortality. Conclusion: The current study’s findings provide epidemiological evidence that diagnosed diabetes at the baseline is associated with increased mortality risk due to cardiovascular disease, chronic lower respiratory diseases, influenza and pneumonia, and kidney disease, but not with cancer or Alzheimer’s disease.

Double-layer hybrid nanofiber membranes by electrospinning with sustained antibacterial activity for wound healing

Jiaqi Zhang,Jiaxin Li,Xiao-Fei Zeng,Jie-Xin Wang,Yuan Le 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-

Bacterial infection is a general problem that increases the burden of wound treatment. It has been intenselyexpected to fabricate bioactive wound dressings with good antibacterial effect. In this work, doublelayerhybrid nanofiber membranes (DHNM) of PVA/COL@ZnONPs and PCL/Gt@TiO2NPs were built by continuouselectrospinning. The matrix membranes with acceptable tensile strength and moisture permeabilityproperty were obtained by optimizing the formulation and spinning conditions. The matrixmembranes exhibited Young’s modulus of 91.93 MPa and tensile stress of 2.61 MPa. The water vaportransmittance rate (WVTR) of matrix membranes was 1140.45 g/m2day. ZnONPs in the inner layer werereleased quickly in 2 hours to destroy the bacteria in the wound. TiO2NPs in the outer layer were sustainablyreleased within 7 days to resist the bacterial attack outsides. The double-layer membranes showedgood biocompatibility and enhanced the migration of cells. The cell migration rate of double-layer hybridmembranes (DHNM) was higher than that of single layer membranes. The double-layer membraneshowed 93% elimination of the wound specific P. aeruginosa, over 99% inhibition to E. coli and over 97%to S. aureus. This study provides a potential approach for wound dressings to improve antibacterial effect.

Fast Response Research of Magnetically Controlled Reactor

Chen Feng,Wang Jun,Zheng Hao,Lu Wenhua,Tian Cuihua,Yuan Jian,Chen Baichao,Yuan jiaxin 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.10

As a kind of reactive power compensation equipment with control flexibility and high reliability, magnetically controlled reactor (MCR) is widely used in reactive power compensation, over-voltage limitation and other aspects. However, low responding speed has severely limited the application of MCR. Especially when applied to suppress voltage flicker and arc suppression coil, the slow response of MCR will decrease the stability of control system, even causing the system shock. To improve the response performance of MCR, in this paper, the working principle of MCR has been analyzed, and a fast response structure of MCR has been designed with the novel fast response structure, fast excitation and rapid demagnetization can be achieved. According to the simulation and experiment results, the effectiveness of the proposed structure is verified by limiting the response time in 30ms.