Sensitive detection of levofloxacin and copper (II) based on fluorescence ‘‘turn on-off” of biomass carbonized polymer dots

Jiasheng Lin,Shuliang Yang,Yanjie Wang,Yahan Cui,Qiaoyan Li,Yanhua Chen,Lan Ding 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

A novel type of biomass carbonized polymer dots (CS-CPDs) with green fluorescence emission were synthesizedvia a one-step microwave-assisted method, using chitosan and maleic acid as the precursors. The fluorescence intensity of CS-CPDs was selectively enhanced (turn on) with increasing levofloxacin(LEV) concentration based on Aggregation Induced Emission Enhancement. The linear range of thismethod was 1–35 lmol/L, with the limit of detection of 0.20 lmol/L. Furthermore, we demonstrated thatthe fluorescence intensity of CS-CPDs/LEV was restored (turn on-off) due to the addition of copper (II),which could assemble a more stable Cu2+/LEV complex through coordination. For the first time, CSCPDswere utilized as a selective fluorescent ‘‘turn on-off” probe for the continuous detection of LEVand Cu2+. Excellent results were also obtained in environmental water samples analysis with recoveriesranging of 91.3–99.6% and 97.7–113.4%, respectively. Moreover, the prepared CS-CPDs exhibited excellentoptical stability and large Stokes shift (139 nm), which predicted broad application prospects inthe field of fluorescence sensing.

An Integrated Three-phase Transformer for Partial Parallel Dual Active Bridge Converter

Jiasheng Huang,Zhe Zhang,Yudi Xiao,Bainan Sun,Michael A.E. Andersen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

In this paper, an integrated three-phase transformer is utilized in the partial parallel dual active bridge (PPDAB) converter. Due to the symmetrical structure, the flux generated by the primary windings is equally distributed to the three outer legs. Given the same number of turns of the windings in each parallel modules, the ac currents can inherently balance in the parallel modules. In order to enlarge the leakage inductor to serve as the interfacing ac inductor in the PPDAB converter, the coupling between the primary windings and secondary windings is weakened by placing the primary and secondary windings on the center and outer legs, respectively. Compared to the discrete three-phase transformers, the winding loss will also decrease with the proposed structure. A 1kW 400V/50V 500 kHz prototype with an efficiency of 96.72% is built and tested to verify the theoretical analysis.

Dynamic analysis of 5-DOFs aerostatic spindles considering tilting motion with varying stiffness and damping of thrust bearings

Jiasheng Li,Pinkuan Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

Aerostatic bearings are of great importance for improving machining accuracy of a workpiece surface. The dynamics of air bearings and aerostatic spindle system in ultra-precision machine, which mainly causes mid-spatial waviness errors, has a great effect on surface topography. The dynamic coefficients of the thrust bearings were determined by adopting the perturbation method and finite difference method with MATLAB ® software. In addition, the influences of the spindle speed and tilt angle conducted upon the dynamics of the thrust bearings were investigated in detail. The dynamic response of the spindle system, which is closely related to the performance of the thrust bearing and does not work only by the effect of the journal bearing, supported by pressured air film was obtained. The simulation analysis of spindle responses under cutting force and experiment results is well matched, and the analysis method proposed in this paper can be also applicable to other air bearing spindle systems.

Chromogenic/Fluorogenic Ensemble Chemosensing Systems

Wu, Jiasheng,Kwon, Bomi,Liu, Weimin,Anslyn, Eric V.,Wang, Pengfei,Kim, Jong Seung American Chemical Society 2015 Chemical reviews Vol.115 No.15

<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/chreay/2015/chreay.2015.115.issue-15/cr500553d/production/images/medium/cr-2014-00553d_0121.gif'></P>

Fabrication of porous Mn₂O₃ microsheet arrays on nickel foam as high–rate electrodes for supercapacitors

Xu, Jiasheng,Sun, Yudong,Lu, Mingjun,Wang, Lin,Zhang, Jie,Qian, Jianhua,Kim, Eui Jung ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.717 No.-

<P><B>Abstract</B></P> <P>Porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam have been prepared by a mild chemical reaction combined with a calcination process. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays are directly grown on the surface of the conductive nickel foam. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays are composed of numerous interconnected nanopores with an average size of about 16 nm. The specific surface area of the porous Mn<SUB>2</SUB>O<SUB>3</SUB> materials is 36.34 m<SUP>2</SUP> g<SUP>−1</SUP>. The fabricated electrode materials exhibit a high specific capacitance of 566.6 F g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP> and 294.4 F g<SUP>−1</SUP> at a current density of 20 A g<SUP>−1</SUP>. The energy density of the porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet was 19.65 Wh kg<SUP>−1</SUP> at a power density of 124.85 W kg<SUP>−1</SUP> and it was reduced to 10.22 Wh kg<SUP>−1</SUP> at a power of density of 5.00 kW kg<SUP>−1</SUP>. The good electrochemical capacitance is ascribed to the interconnected porous structure of the Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet, which facilitates electrolyte diffusion and enhances electron transport. The porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam are a promising electrode material for supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous Mn<SUB>2</SUB>O<SUB>3</SUB> microsheet arrays on nickel foam are synthesized via solution process followed with an annealing treatment. </LI> <LI> It directly utilizes as electrode materials for pseudocapacitors. </LI> <LI> A specific capacitance of 566.6 F g<SUP>−1</SUP> is achieved at a current density of 0.5 A g<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Modeling identification and control of a 6-DOF active vibration isolation system driving by voice coil motors with a Halbach array magnet

Dawei Jiang,Jiasheng Li,Xingzhan Li,Chaodong Deng,Pinkuan Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.2

The sheet current model considering the end effects is applied to design a sixdegree-of-freedom (6-DOF) active vibration isolation system (AVIS) driving by the voice coil motors (VCMs). Compared with the charge model, the sheet current method represents higher calculation efficiency. Then, the hybrid functions (HFs) are employed to identify the multi-input and multi-output (MIMO) AVIS, and the identification parameters are used to design the controller. To promote the control performance, the composite nonlinear feedback (CNF) controller is designed based on the identification parameters. Consequently, the simulations and experiments are carried out, compared with PID controller, the CNF controller shows quicker response and smaller overshoot, i.e., the CNF controller achieves the dynamic damping ratio during the control. Thus, the experimental results demonstrate the better performance of the CNF controller.

Facile Synthesis of Small Gold Nanoparticles Stabilized by Carbon Nanospheres for Selective Hydrogenation of 4-Nitrobenzaldehyde

Minghui Liu,Jiasheng Wang,Yingcen Liu,Rongwen Lu,Shufen Zhang 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.10

We report the facile synthesis of small gold nanoparticles stabilized by carbon nanospheres (Au@C) for highly active and selective hydrogenation of 4-nitrobenzaldehyde. The formation of such a Au@C unique structure can be attributed to the high distribution of Au(III) species in the melamine-formaldehyde resin nanospheres, which were formed via the coordination of Au(III) with the abundant imino groups of melamine-formaldehyde pre-polymer. After the subsequent condensation and confined in situ reduction, small gold nanoparticles, and carbon nanospheres were formed simultaneously. Under the reaction conditions of 80 °C and 1.6 MPa, 99.3% conversion and >99% selectivity were achieved for the hydrogenation of 4-nitrobenzaldehyde to 4-aminobenzaldehyde.

Delayed Terminal Ileal Perforation in a Relapsed/Refractory B-Cell Lymphoma Patient with Rapid Remission Following Chimeric Antigen Receptor T-Cell Therapy

Yongxian Hu,Jiasheng Wang,Chengfei Pu,Kui Zhao,Qu Cui,Guoqing Wei,Wenjun Wu,Lei Xiao,Yang Xiao,Jinping Wang,Zhao Wu,He Huang 대한암학회 2018 Cancer Research and Treatment Vol.50 No.4

Chimeric antigen receptor T-cell strategy targeting CD19 (CART19) has prominent anti-tumor effect for relapsed/refractory B-cell lymphomas. CART19-associated complications have been gradually recognized, however, late-onset complications have not been extensively studied. Herein, for the first time we report a diffuse large B-cell lymphoma patient with terminal ileum involvement obtained rapid remission and developed spontaneous terminal ileal perforation 38 days following CART19 infusion. The late-onset perforation reminds us that, for the safety of CART treatment, more cautions are warranted for the management of delayed GI complications.

A New Modeling and Analysis Approach Based on State-Space Averaging for Converters

Zhenchuan Sun,Jiasheng Zhang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.10

4-quadrant converters (4QCs) have been widely applied in power active VAR and harmonic compensators, FACTS, electric drive systems, and a variety of other applications. The state-space averaging model is usually quite facile and suitable for converter topologies with only two switch states, like half-bridge 4QC units. When directly used in topologies with multiple switch states, however, the modeling method becomes overly complicated. Due to this, plus the fact that multi-phase PWM 4QCs and even other varieties of converters are mostly multi-unit-symmetrical, a novel method is necessary. By researching the inner link between multi-phase topologies and half-bridge units, including inter-phase symmetry configurations, and control relations, this paper proposes a general unified modeling approach for application to multi-phase 4QCs. A series of conclusions are derived, alongside theoretical analysis of the model. The validity of the model and its theory is confirmed using single-phase and three-phase 4QCs and their numerical simulating waveforms as special cases. The proposed method may also extend to the modeling, analysis, and general research of other varieties of converter topologies.

EFFECT OF MACROMOLECULAR COUPLING AGENT PMMA-b-PVTES ON STABILIZING NANO-Si3N4

HUI ZHU,Jiasheng Qian,Peng Chen,JIBIN MIAO,RU XIA,Bin Yang,LIFEN SU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.8

Poly(methyl methacrylate)-b-poly(vinyltriethoxysilane) (PMMA-b-PVTES) are synthesized using atom transfer radical polymerization (ATRP) and used as macromolecular coupling agents to modify silicon nitride nanoparticles (nano-Si3N4). The chemical composition of copolymers PMMA-b-PVTES and modified nano-Si3N4 are confirmed by various characterization techniques. The modified nano-Si3N4 shows excellent hydrophobic nature, which make nanoparticles (NPs) stably disperse in organic solvent. Transmission electron microscope (TEM), particle size testing, contact angle measuring and sedimentation experiment are employed to examine the dispersion of modified nano-Si3N4 in chloroform. By comparing the effects of copolymers with varied number-average molecular weight (Mn) and block length ratio on stabilizing nano-Si3N4, we discussed the mechanism of macromolecular coupling agent stabilizing NPs. In our experiments, the copolymer PMMA88-b-PVTES17 is found to be the most effective macromolecular coupling agent for stabilizing nano-Si3N4.