Preparation and Investigation of Solid Polymer Electrolyte Based on Novel Polyamide Elastomer/Metal Salt

Weibo Kong,Yuan Lei,Ye Yuan,Changlin Zhou,Jingxin Lei 한국고분자학회 2017 Macromolecular Research Vol.25 No.8

Antistatic-polyamide elastomers composed of poly(urethane-urea-amide) (PUUA) and NaSCN was successfully synthesized through in-situ reactive processing in double-screw extruder. The obtained antistatic-polyamide elastomers can be employed as solid polymer electrolyte to improve the surface conductivity of polymers. The effect of PUUA composition, NaSCN content, temperature and relative humidity on the surface resistivity of antistatic-polyamide elastomer was extensively studied by surface resistivity. The results showed that the surface resistivity of antistatic-polyamide elastomer was slightly influenced by temperature and relative humidity, and can satisfy the application of antistatic materials requirement. Moreover, thermalgravity analysis (TGA), tensile test and scanning electron microscopy (SEM) were used to evaluate the thermal stability, mechanical properties and morphology of fracture face of antistatic-polyamide elastomers. TGA results demonstrated that antistatic-polyamide elastomers have a good thermal stability with the onset decomposition temperature exceed 280?. Tensile tests revealed that the prepared antistatic-polyamide elastomers possess good mechanical properties. SEM showed that the antistatic ability of antistatic-polyamide elastomer is relative to the ion-conductive channels or network formed by the PUUA and NaSCN particles.

A PTV Method Based on SIFT Feature Points Matching for Velocimetry Measurement of Oil-water Two-phase Flow in Horizontal Pipelines

Weihang Kong,Lei Li,Lingfu Kong,Yingwei Li,Na Xie 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.12

Due to the advantages of scale invariant feature transform (SIFT) feature points on the invariant to image scale, brightness, rotation, occlusion, noise and so on, this paper proposes a Particle Tracking Velocimetry (PTV) method, based on SIFT feature points matching for velocity measurement of oil-water two-phase flow in horizontal pipelines. The oil-water two-phase flow with large droplet diameter, oil droplets overlap, ununiform lighting, and the centroid position of oil droplets can’t be obtained only by using traditional PTV methods through morphological processing. However, in this paper, the algorithm can directly achieve the average velocity of the flow field according to the positions of correctly matched SIFT feature points, and there is no need to extract the centroid coordinates of each oil droplet. The experimental results show that the proposed algorithm not only can be used in the average velocity measurement of oil-water two-phase flow in horizontal pipelines, but also can reach 95% in the measuring accuracy when the matching feature points are enough sufficient.

Enhanced electrical conductivity of pitch-derived carbon via graphene template effects for high electrically conductive composites

Zhiping Lei,Yazhou Li,Zhao Lei,Xue Yang,Jingchong Yan,Zhanku Li,Hengfu Shui,Shibiao Ren,Zhicai Wang,Ying Kong,Shigang Kang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-

Large-scale preparation of cheap and high-performance carbonaceous materials is in urgent need due tothe huge demand of carbonaceous materials-organic binder composites for Joule heating. Here, carbonbasedelectrothermal composites with high electrical conductivity were fabricated by adjusting the morphologyand structure of pitch-based carbonaceous materials (PC) through the use of graphene asstructure-directing agent to tune the orientation and carbonization of coal pitch. It is demonstrated thatthe addition of graphene can effectively promote the formation of graphitized carbon, increase the contentof sp2C, reduce defective carbon and increase the graphite interlayer spacing. 1% graphene-added PCPVDFcomposite exhibits 290% increase in the carrier concentration, 190% enhancement in mobility, and67% reduction in the volume resistivity compared to PC-PVDF composite. Molecular simulations elucidatethat the graphene edges favor pitch carbonization and improve the orientation factor and energy gap ofcarbon materials. This study provides clues for design of low-cost pitch-derived carbon materials-bindercomposites.

Design and evaluation of spur gear pairs with improved bearing capacity and lubrication performance

Lei Liu,Zhiwei Chen,Rong Kong 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3

The tooth form is the most influential factor on the bearing capacity and operation performance of a gear drive. Tooth profiles of spur gears can be designed based on control of relative curvature of conjugate profiles, but how to conceive appropriate control strategies and appraise gear pairs accurately needs to be investigated in depth. This paper presents the control strategies through analysis of the effect mechanisms of relative curvature on the bearing capacity and lubrication performance. Evaluation approaches of the gear pairs are then proposed by establishing the analytical models (AMs). In case studies, gear pairs with optimal comprehensive performance are designed through five control strategies. The AMs for contact and bending capacity are validated with the finite element models. The effects of the control strategies are discussed through comparative analysis. Results reveal that the control strategies lead to remarkable enhancement of bearing capacity and lubrication performance.

Active and Passive Beamforming for IRS-Aided Vehicle Communication

( Xiangping Kong ),( Yu Wang ),( Lei Zhang ),( Yulong Shang ),( Ziyan Jia ) 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.5

This paper considers the jointly active and passive beamforming design in the IRS-aided MISO downlink vehicle communication system where both V2I and V2V communication paradigms coexist. We formulate the problem as an optimization problem aiming to minimize the total transmit power of the base station subject to SINR requirements of both V2I and V2V users, total transmit power of base station and IRS’s phase shift constraints. To deal with this non-convex problem, we propose a method which can alternately optimize the active beamforming at the base station and the passive beamforming at the IRS. By using first-order Taylor expansion, matrix analysis theory and penalized convex-concave process method, the non-convex optimization problem with coupled variables is converted into two decoupled convex sub-problems. The simulation results show that the proposed alternate optimization algorithm can significantly decrease the total transmit power of the vehicle base station.

Detection and Characterization of PCR-SSCP Markers of the Bovine Lactoferrin Gene for Clinical Mastitis

Zhou, Lei,Yang, Yuan-Yuan,Li, Zhong-Hao,Kong, Li-Juan,Xing, Guan-Dong,Di, He-Shuang,Wang, Gen-Lin Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.10

A total of 80 cows, including 40 top mastitis resistant and 40 top mastitis susceptible animals as Group I and Group II, were selected from a population of 520 cows based on clinical mastitis occurrence. PCR-SSCP analysis on four fragments within the 5'region and two fragments of Exons 4,15 of bovine lactoferrin (bLF) revealed that four fragments-P1,P4,E4,E15-had polymorphisms which totally included six base mutations, and only two of them had significant differences in allele frequencies between resistant and susceptible groups, P1 (53.7% vs. 70.0%, p<0.05) and P4 (55.0% vs. 68.8%, p<0.05). Further study on these two promising markers combined with the milk performance traits of cows demonstrated that their selection would result in higher fat percentage (p<0.05), lower Somatic Cell Score (SCS) (p<0.05) and Clinical Mastitis Residuals (CMR) (p<0.01) indicating higher mastitis resistance and lower milk yield (p<0.05). The putative transcription factor binding sites in the 5'region were also studied by using MatInspector 7.2.2 software, and two signal pathways regulating the expression of bLF including the NF-${\kappa}B$ pathway and nuclear hormone receptor pathway were predicted.

Insufficient radiofrequency ablation-induced autophagy contributes to the rapid progression of residual hepatocellular carcinoma through the HIF-1α/BNIP3 signaling pathway

( Wen-lei Xu ),( Shao-hong Wang ),( Wen-bing Sun ),( Jun Gao ),( Xue-mei Ding ),( Jian Kong ),( Li Xu ),( Shan Ke ) 생화학분자생물학회(구 한국생화학분자생물학회) 2019 BMB Reports Vol.52 No.4

Currently speaking, it is noted that radiofrequency ablation (RFA) has been the most widely used treatment for hepatocellular carcinoma (HCC) occurring in patients. However, accumulating evidence has demonstrated that the incidence of insufficient RFA (IRFA) may result in the identified rapid progression of residual HCC in the patient, which can greatly hinder the effectiveness and patient reported benefits of utilizing this technique. Although many efforts have been proposed, the underlying mechanisms triggering the rapid progression of residual HCC after IRFA have not yet been fully clarified through current research literature reviews. It was shown in this study that cell proliferation, migration and invasion of residual HepG2 and SMMC7721 cells were significantly increased after the IRFA was simulated in vitro. In other words, it is noted that IRFA could do this by enhancing the image of autophagy of the residual HCC cell via the HIF-1 α/BNIP3 pathway. Consequently, the down-regulation of BNIP3 may result in the inhibition of the residual HCC cell progression and autophagy after IRFA. Our present study results suggest that IRFA could promote residual HCC cell progression in vitro by enhancing autophagy via the HIF-1 α/BNIP3 pathway. For this reason, it is noted that the targeting of the BNIP3 may be useful in preventing the rapid growth and metastasis of residual HCC after IRFA. [BMB Reports 2019; 52(4): 277-282]

New Calibration Method of Two-Dimensional Laser Scanner and Camera Based on LM-BP Neural Network

Jianlei Kong,Li Fan,Jinhao Liu,Lei Yan,Xiaokang Ding 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.7

The calibration between a camera and a two-dimensional laser scanner (2DLS) is an essential step in the object detecting system. Many algorithms with linear model have been proposed. But these tend to solve intrinsic and extrinsic calibration parameters separately and are influenced seriously by the poor initial data, which leads to unstable and inaccurate results. Hence, a new nonlinear model based on the Back Propagation neural network trained by the Levenberg-Marquardt algorithm (LM-BP) is presented for calibration in this paper. Before the calibration, the original laser data is fitted linearly to avoid the ranging error and is optimized by an angular increment to reduce the step-angular error. Then, the calibration network with 4 inputs composed of the lasers points’ coordinates and constant 1, and 2 outputs are obtained, expected values of which are the coordinates of corresponding points in the image coordinates. The sum of square of errors between the network outputs and expected values is taken to adjust the modifications of the weights and thresholds with the Levenberg-Marquardt method to optimize the calibration model. Finally, compared with related researches, experimental results show that the accuracy of calibration between camera and 2DLS is significantly improved, and the detecting system is more suitable for actual measurement situations.

Soft-Decision for Differential Amplify-and-Forward over Time-Varying Relaying Channel

( Fengyue Gao ),( Lei Kong ),( Feihong Dong ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.3

Differential detection schemes do not require any channel estimation, which can be employed under user mobility with low computational complexity. In this work, a soft-input soft-output (SISO) differential detection algorithm is proposed for amplify-and-forward (AF) over time-varying relaying channels based cooperative communications system. Furthermore, maximum-likelihood (ML) detector for M-ary differential Phase-shift keying (DPSK) is derived to calculate a posteriori probabilities (APP) of information bits. In addition, when the SISO is exploited in conjunction with channel decoding, iterative detection and decoding approach by exchanging extrinsic information with outer code is obtained. Finally, simulation results show that the proposed non-coherent approach improves detection performance significantly. In particular, the system can obtain greater performance gain under fast-fading channels.

Efficient starvation therapy with three-pathway blocking in combination with PTT/CDT for TME reversal and tumor apoptosis

Mengchao Ding,Xiaoying Kong,Weiyan Chen,Lei Yan,He Huang,Zunzhou Lv,Peng Jiang,Ali Mu,Congcong Huang,Jinsheng Shi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

Single cancer starvation therapy (ST) strategy can’t achieve satisfactory anti-tumor effect, mainly due tothe diversified nutritional sources of tumor cells. Herein, CuS@Axitinib-SiO2@2-Deoxy-D-glucose(2-DG)-CaCO3-RGD nanoparticles (CADCR NPs) were prepared for three-pathway blocking for efficient starvationtherapy as well as reinforced photothermal therapy (PTT) and chemodynamic therapy (CDT). AfterCADCR NPs were targeted to tumor cells, CaCO3 was ruptured in the acidic environment, releasingCa2+ to chelate glutamine and cutting off the glutamine metabolic pathway of the tumor. 2-DG was alsoreleased from mesoporous SiO2 and restrained the glycolytic pathway of tumor cells. In addition, underthe thermal stimulus of near-infrared irradiation, axitinib was released from CuS NPs, which inhibited theproliferation of tumor blood vessels, ultimately inhibiting the aerobic respiratory pathway of tumor cells. Interestingly, CADCR NPs also showed potential to reshape the tumor microenvironment (TME) and promotedthe transformation of macrophages from M2 to M1 type, increasing the expression of CD8+ T cellsin the tumor site. In conclusion, CADCR NPs achieve severe tumor starvation by simultaneously interferingwith three energy metabolic pathways, and further enhance tumor treatment with the aid of PTT,CDT, and TME improvement, which exhibits great potential for clinical cancer therapy.