Manufacturing High Sensitive Strain Sensor of Polyurethane Nanofiber Mat/AgNWs by Simple Dip-dry Method

Lingling Liu,Shixian Chen,Anchang Xu,Guangming Cai 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

Adding nano silver wires (AgNWs) onto electrospun polyurethane (PU) nanofiber mat provide a new idea for developing wearable smart textiles. The excellent stretchability of PU and the excellent electrical conductivity of AgNWsenable wearable smart textiles to monitor human physiological data. In this study, PU nanofiber mat was prepared by electrospinning and subsequently was dip into AgNWs dispersion for conductivity. The PU nanofiber mats adsorbed with AgNWs were with both good stretching and electrical conductivity. The surface morphology and surface elements were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The mechanical properties and the variation of electrical conductivity under static and dynamic stretching cycles were studied. In addition, it is accurately monitoring variation in electrical conductivity during finger bending and wrist movement. The experimental results show that the PU mat treated by AgNWs has the potential to be used as a wearable strain sensor for real-time monitoring of human motion.

A Modeling and Analysis Method for CCM Fractional Order Buck‑Boost Converter by Using R–L Fractional Defnition

Lingling Xie,Zhipei Liu,Bo Zhang 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4

Fractional defnition is important for the application of fractional-order theory in electrical engineering, and fractional-order theory directly afects the accuracy of the model and the operating characteristics of the power converter. Most researchers used the fractional defnition of Caputo to study fractional order power converter. However, it is found that the model based on Caputo fractional defnition is inconsistent with the actual situation. A novel modeling and analysis method for the fractional buck–boost converter is proposed in this paper. Firstly, the fractional converter model operating in continuous conduction mode (CCM) is established and the DC analysis is completed by using Riemann–Liouville (R–L) fractional defnition. The R–L fractional defnition is nearly 1.1% more accurate than the Caputo defnition in the DC analysis. Secondly, the infuence of the capacitor and inductor orders on the converter is performed. The results show that the capacitor and inductor orders have great efect on the DC components of the state variable and the steady-state characteristics of the fractional order buckboost converter. Finally, simulation and experiment results are provided that the validity of theoretical analysis.

Discrete Element Simulation Study on Particle Segregation Effect of a Hemispherical Shell Swing-Oscillating Trough Under Combination Swing-Oscillating

Lingling Li,Zhenghai Liu,Jiaye Xu,Xuedong Ma 한국전기전자재료학회 2020 Transactions on Electrical and Electronic Material Vol.21 No.3

In order to enhance the segregation eff ect of material particles in a hemispherical shell swing-oscillating trough under combination swing-oscillating, by means of three dimensional discrete element method, and by use of the two-dimensional dry granules of plastic ball and steel ball, the discrete element simulation study of particle segregation process is carried out in turn in three cases, which is composed of a single swing-oscillating in smooth trough, a combination swing-oscillating in smooth trough, and a combination swing-oscillating in adding bulge trough. The particle segregation eff ect was evaluated by particle volume concentration and combined with segregation cloud picture simulated. The result indicates that segregation effect of combination swing-oscillating is better than that in single swing-oscillating; layering eff ect of the trough added bulge is better than that in the smooth trough. And compared to single swing-oscillating in smooth trough, the degree of segregation of particles in added bulge trough can be increased by 10–15% when being combination swing-oscillating.

Novel Mn–Ce–Ti Mixed-Oxide Catalyst for the Selective Catalytic Reduction of NO_<i>x</i> with NH₃

Liu, Zhiming,Zhu, Junzhi,Li, Junhua,Ma, Lingling,Woo, Seong Ihl American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.16

<P>Mn-Ce-Ti mixed-oxide catalyst prepared by the hydrothermal method was investigated for the selective catalytic reduction (SCR) of NOx with NH3 in the presence of oxygen. It was found that the environmentally benign Mn-Ce-Ti catalyst exhibited excellent NH3-SCR activity and strong resistance against H2O and SO2 with a broad operation temperature window, which is very competitive for the practical application in controlling the NOx emission from diesel engines. On the basis of the catalyst characterization, the dual redox cycles (Mn4+ + Ce3+<-> Mn3+ + Ce4+, Mn4+ + Ti3+ <-> Mn3+ + Ti4+) and the amorphous structure play key roles for the high catalytic deNO(x) performance. Diffuse reflectance infrared Fourier transform spectroscopy studies showed that the synergetic effect between Mn and Ce contributes to the formation of reactive intermediate species, thus promoting the NH3-SCR to proceed.</P>

Over-expression of GmMYB39 leads to an inhibition of the isoflavonoid biosynthesis in soybean (Glycine max. L)

Liu, Xiaoqing,Yuan, Lingling,Xu, Ling,Xu, Zhaolong,Huang, Yihong,He, Xiaolan,Ma, Hongxiang,Yi, Jinxin,Zhang, Dayong 한국식물생명공학회 2013 Plant biotechnology reports Vol.7 No.4

In this paper, we isolated and characterized a gene encoding the soybean MYB transcription factor, GmMYB39 (Accession No: XM_003538605). Analysis of the deduced amino acid sequence revealed that GmMYB39 contained N-terminal R2R3 repeats that corresponded to the DNA-binding domain of plant MYB-type proteins, which were highly conserved among the R2R3-MYB proteins. The detailed expression pattern of GmMYB39 in various tissues of soybean was investigated by quantitative RT-PCR. The transcript level was found to be higher in flowers than in other examined organs. In contrast, the GmMYB39 expression level was relatively weak in the pod. The GmMYB39-GFP fusion protein was found to localize in the nucleus of Arabidopsis mesophyll protoplasts. Over-expression of GmMYB39 in hairy roots resulted in a significant reduction of the transcript levels of PAL, C4H, CHS, 4CL, and CHR. Whereas, the IFS transcript level was slightly but not significantly increased, and no significant change in CHI expression was observed between over-expression and control roots. The repressing effect on expression of CHS was further supported by the results from co-transfection assays of CHS promoter (reporter) and GmMYB39 (effector) in soybean. Compared to the control (only with the reporter construct), a significant decrease in the GUS activity was observed in soybean hairy roots with both effector and reporter constructs. Furthermore, an ultimate decrease in isoflavonoids contents coincided with the decrease in the transcript levels of PAL, C4H, CHS, 4CL, and CHR. Overall, the results suggest that GmMYB39 plays an inhibiting role in regulating the isoflavonoid biosynthesis in soybean.

Study of Distribution Model under Disaster Relief Logistics System

Lingling-Chen,Jiaqi-Yang,Jianjun-Liu 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.11

This paper mainly using the supplies distribution model in emergency situation, conducted a in-depth research on the problem of supplies distribution in the disaster relief, including single supplies and multiple supplies respectively with and without transport capacity constraints, and then implement its calculation through computer program; next, emergency supplies distribution model of multiple target and dynamic conditions is discussed in further, that is to say, considering some conditions such as the road condition change in the existing logistics system when disasters occur, in this case, the disaster relief supplies distribution model of object-oriented is introduced to guarantee the supplies. At present, there is still no systematic disaster relief logistics system in our country, so the study results of this paper have a certain reference value to the build and implementation of disaster relief logistic system in our country.

Progress of establishing a standard for measuring the performance of Roots Vacuum Pumps by ISO TC 112

Kun LIU,Songgang SUN,Tao XU,Xilong WANG,Lingling WANG,Yuying LI 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Application of model reduction technique and structural subsection technique on optimal sensor placement of truss structures

Lu, Lingling,Wang, Xi,Liao, Lijuan,Wei, Yanpeng,Huang, Chenguang,Liu, Yanchi Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.2

An optimal sensor placement (OSP) method based on structural subsection technique (SST) and model reduction technique was proposed for modal identification of truss structures, which was conducted using genetic algorithm (GA). The constraints of GA variables were determined by SST in advance. Subsequently, according to model reduction technique, the optimal group of master degrees of freedom and the optimal objective function value were obtained using GA in a case of the given number of sensors. Correspondingly, the optimal number of sensors was determined according to optimal objective function values in cases of the different number of sensors. The proposed method was applied on a scaled jacket offshore platform to get its optimal number of sensors and the corresponding optimal sensor layout. Then modal kinetic energy and modal assurance criterion were adopted to evaluate vibration energy and mode independence property. The experiment was also conducted to verify the effectiveness of the selected optimal sensor layout. The results showed that experimental modes agreed reasonably well with numerical results. Moreover the influence of the proposed method using different optimal algorithms and model reduction technique on optimal results was also compared. The results showed that the influence was very little.

Fractional-Order Adaptive Sliding Mode Control for Fractional-Order Buck-Boost Converters

Xie Lingling,Liu Zhipei,Ning Kangzhi,Qin Rui 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.3

In previous studies, the combination of fractional calculus (FC) and sliding-mode control (SMC) has been gaining more and more interest due to fusion characteristics of SMC and FC. But most study integer-order buck converters, and few study control strategies of fractional-order converters. In this paper, the sliding mode controller and fractional adaptive sliding mode controller for fractional-order buck-boost converters are proposed. An affi ne nonlinear system model of the fractionalorder buck-boost converter is built. Based on the diff erential geometry theory, the exact feedback linearization is performed on the affi ne nonlinear model of the fractional-order buck-boost converter. On this basis, a fractional adaptive sliding mode controller is designed by selecting a linear sliding surface and adaptive control law. The stability of the fractional controller is proved by the Mittag–Leffl er stability theorem. The simulation results show that the fractional adaptive sliding mode control has good dynamic response performance and small steady-stage error regulating characteristics. Compared with traditional sliding mode control and PI λ control, the control method demonstrates stronger robustness under various disturbances.

Soybean hull functionalized by phosphoric acid for sorption of copper from aqueous solution

Renmin Gong,Lingling Liu,Min Feng,Jiajing Zhao,Xingyan Liu,Shoujun Ni 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.2

One kind of potentially biodegradable cationic sorbent, which bears hydroxyl groups of phosphoric acid as its functional groups, with high sorption capacity of copper was prepared by thermochemically esterifying phosphoric acid (PA) onto soybean hull. Sorption of Cu(Ⅱ) from aqueous solution onto modified soybean hull (MSH) was investigated in a batch system. The sorption experiments were performed under various conditions such as different initial pH, copper concentration, MSH dosage, and contact time. The maximum copper sorption was obtained when initial solution pH≥3.5. The isothermal data of copper sorption fitted the Langmuir model and the sorption process could be described by the pseudo-first-order kinetic model. The maximum sorption capacity (Qm) of MSH for Cu(Ⅱ) was 31.55 mg/g. For 100 mg/l of Cu(Ⅱ) solution, a sorption ratio above 91% could be achieved by 5.0 g/l of MSH. The equilibrium of Cu(Ⅱ) sorption was reached within 50 min. The foreign cation and chelator in Cu(Ⅱ) solution caused decline of Cu(Ⅱ) sorption.