Enhanced Mechanical Properties and Thermal Conductivity for GNPs/Al2024 Composites with In Situ SiC Nanorods

Lili Chen,Yushi Qi,Yanhan Fei,Zhiming Du 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10

In order to significantly enhance the performance of graphene in metal matrix composites, in situ SiC nanorods were successfullyfabricated to enhance graphene nanoplatelets (GNPs)-reinforced Al2024 composite, which was prepared by powdersemi-solid processing and friction stir processing. The SiC–GNPs dispersed in the Al matrix uniformly, SiC nanorodswere randomly grown on GNPs sheets in any direction, bridging GNPs as well as GNPs and the Al matrix. Meanwhile, theinterfacial bonding was effective. The hybrid reinforcement of SiC and GNPs endowed composites with superior mechanicalproperties and thermal conductivity. The in situ SiC nanorods transfer phonons and reduce phonon scattering effect inthe through-plane direction of GNPs, which conducive to heat transmission. The composite exhibits improved mechanicalproperties, maximum tensile strength and hardness of 589 MPa and 193 HV are obtained, with 1.0 wt% GNPs addition,respectively. The thermal conductivity of composite increases with the content of SiC–GNPs. When the content of SiC–GNPsreaches 1.5 wt%, the composite has significantly enhanced thermal conductivity (224 W m−1 K−1), which is 115% timeshigher than that of Al2024. Moreover, the effects of SiC–GNPs on the properties were discussed.

A NAC Transcription Factor ZmNAC84 affects Pollen Development Through the Repression of ZmRbohH Expression in Maize

Aying Zhang,Qi Yang;Heping Zhang;Chen Liu;Liping Huang;Lili Zhao 한국식물학회 2018 Journal of Plant Biology Vol.61 No.6

The NAC proteins are plant-specific transcriptionfactors and widely distributed in plants. The wide functionsof NAC transcription factors were studied, but the roles ofNAC in pollen development are largely unclear. Here, wefound that ZmNAC84 played a vital role in maize pollendevelopment. ZmRbohH showed high expression in pollen. ZmNAC84 inhibited the ZmRbohH expression by directlybinding to its promoter in pollen. Moreover, phosphorylationof ZmNAC84 at Ser113 played an important role in thisprocess. These results suggest that ZmNAC84 plays anegative role in pollen development possibly via repressingthe ZmRbohH expression.

Facile preparation of antifouling g-C3N4/Ag3PO4 nanocomposite photocatalytic polyvinylidene fluoride membranes for effective removal of rhodamine B

Yanhua Cui,Lili Yang,Minjia Meng,Qi Zhang,Binrong Li,Yilin Wu,Yunlei Zhang,Jihui Lang,Chunxiang Li 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.2

A simplified strategy for facilely fabricating antifouling graphite carbon nitride/silver phosphate (g-C3N4/ Ag3PO4) nanocomposite photocatalytic polyvinylidene fluoride (PVDF) porous membranes was developed for effective removal of rhodamine B (RhB). g-C3N4/Ag3PO4 heterojunction was strongly fixed to the interior of the PVDF membranes via phase inversion method. The membrane structure was analyzed by Fourier transform spectrophotometer (FT-IR). The morphology of the prepared membranes was investigated using scanning electron microscopy (SEM), EDX-mapping and atomic force microscopy (AFM), respectively. All prepared nanocomposite photocatalytic PVDF membranes exhibited a typically porous structure, and g-C3N4/Ag3PO4 nanocomposites were well dispersed inside the membranes. The obtained g-C3N4/Ag3PO4 heterojunction nanoparticle decorated PVDF membrane had a lower water contact angle of 79o and higher porosity of 85% than that of other two control membranes. The nanocomposite photocatalytic PVDF porous membranes had extremely high permeation flux over 1,083 L·m−2·h−1, and could be used for the removal of RhB. The removal efficiency of g-C3N4/Ag3PO4-PVDF membranes towards RhB solution under visible light irradiation reached 97%, higher than that of the pure PVDF membranes (41%) and g-C3N4-PVDF membranes (85%). Remarkably, the flux performance and flux recovery ratio (FRR) of membranes revealed that the g-C3N4/Ag3PO4- PVDF membranes could recover high flux after fouling, which presented better fouling resistance. Furthermore, the fabricated antifouling g-C3N4/Ag3PO4 nanocomposite photocatalytic PVDF porous membranes exhibited excellent recyclability. Therefore, it is expected that g-C3N4/Ag3PO4-PVDF membranes could provide an energy-saving strategy for effective removal of organic dyes wastewater and have a great potential for practical wastewater treatment in the future.

Calibration of Underwater Polarization Image Based on the Radian of Distorted Curves in the Checkboard

Jiaming Wei,Qi Li,Lili Zhang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.8

The calibration of polarization imaging system is the premise to obtain target polarization information accurately, in this paper, we propose a method of calibration based on the radian of distorted curves in the checkboard to solve the problem of losing polarization information in the underwater distorted polarization images. Firstly, we use the radian of distorted curves in the checkboard to calculate the coordinates of distortion center, and calibrate the region near the distortion center. Then we use the calibrated region to reconstruct the whole image. Finally, we combine the distorted image, the reconstructed image and the distortion model to obtain the calibration parameters. With these parameters we can get the calibrated polarization images. The experiments show that our method can calibrate the polarization image accurately, reduce the coupled error and calculate parameters independently.

Intraoperative frozen pathology exam of Common iliac lymph nodes and Para-Aortic lymphadenectomy on the prognosis and quality of life for patients with IB2-IIA2 Cervical Cancer: trial protocol for a randomized controlled trial (C-PACC trial)

Xinyu Qu,Junjun Qiu,Lili Jiang,Xiaorong Qi,Guonan Zhang,Weiwei Feng,Yudong Wang,Yincheng Teng,Xipeng Wang,Xiaoqing Guo,Keqin Hua 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.2

Background: The impact of para-aortic lymphadenectomy (PALD) on prognosis and quality of life (QoL) for IB2-IIA2 cervical cancer patients remain controversial. And whether intraoperative frozen pathology exam on common iliac lymph nodes could help predict para-aortic lymph node (PALN) metastasis was unanswered with high-level evidence. Methods: A multi-center, randomized controlled study is intended to investigate the effect of PALD on the prognosis and QoL in cervical cancer patients and to assess the value of intraoperative frozen pathological evaluation of common iliac nodes metastasis for the prediction of PALN metastasis. After choosing whether to receive intraoperative frozen pathological examination of bilateral common iliac lymph nodes, eligible patients will be randomly assigned (1:1) to receive PALD or not. The primary end point is 2-year progression-free survival (PFS). The secondary end points include 5-year PFS, 2-year overall survival (OS), 5-year OS, adverse events (AEs) caused by PALD, AEs caused by radiotherapy and QoL. A total of 728 patients will be enrolled from 8 hospitals in China within 3-year period and followed up for 5 years.

Effects of Glucagon-Like Peptide-2-Expressing Saccharomyces cerevisiae Not Different from Empty Vector

( Xi Zhong ),( Guopeng Liang ),( Lili Cao ),( Qi Qiao ),( Zhi Hu ),( Min Fu ),( Hong Bo ),( Qin Wu ),( Guanlin Liang ),( Zhongwei Zhang ),( Lin Zhou ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.10

Saccharomyces cerevisiae (S. cerevisiae) and glucagon-like peptide-2 (GLP-2) have been employed to improve the intestinal development of weaned animals. The goal of this study was to determine whether either exogenous S. cerevisiae or GLP-2 elicits major effects on fecal microbiotas and cytokine responses in weaned piglets. Ninety-six piglets weaned at 26 days were assigned to one of four groups: 1) Basal diet (Control), 2) empty vector-harboring S. cerevisiae (EV-SC), 3) GLP-2-expressing S. cerevisiae (GLP2-SC), and 4) recombinant human GLP-2 (rh-GLP2). At the start of the post-weaning period (day 0), and at day 28, fecal samples were collected to assess the bacterial communities via sequencing the V1-V2 region of the 16SrRNA gene, and piglets’ blood was also sampled to measure cytokine responses (i.e., IL-1β, TNF-α, and IFN-γ). This study revealed that, on the one hand, although S. cerevisiae supplementation did not significantly alter the growth of weaned piglets, it induced increases in the relative abundances of two core genera (Ruminococcaceae_norank and Erysipelotrichaceae_norank) and decreases in the relative abundances of two other core genera (Lachnospiraceae_norank and Clostridiale_norank) and cytokine levels (IL-1β and TNF-α) (p < 0.05, Control vs EV-SC; p < 0.05, rh-GLP2 vs GLP2-SC). On the other hand, GLP-2 supplementation had no significant influence on fecal bacterial communities and cytokine levels, but it produced better body weight and average daily gain (p < 0.05, Control vs EV-SC; p < 0.05, rh-GLP2 vs GLP2-SC). Therefore, altered fecal microbiotas and cytokine response effects in weaned piglets were due to S. cerevisiae rather than GLP-2.

Immunomodulatory effects of Clostridium butyricum on human enterocyte-like HT-29 cells

Gao Quanxin,Wang Jinbo,Qi Lili,Wu Tianxing,Xia Tingting 한국통합생물학회 2013 Animal cells and systems Vol.17 No.2

Oral administration of Clostridium butyricum as probiotics is increasingly gaining importance in the treatment of intestinal inflammations and improvement of animal performance. The mechanisms of host cell receptor recognition of C. butyricum and downstream immune signaling pathways leading to this beneficial event, however, remain unclear. In this study, C. butyricum was investigated for its capability to influence the innate immune response of HT-29 cells to explore its mechanism of action. Our data showed that C. butyricum was able to stimulate toll-like receptor 2 (TLR2) production at mRNA level; however, TLR4, TLR5, TLR9, and myeloid differentiation primary response protein 88 (MyD88) transcription levels remain unaltered. The nuclear factor kB (NF-kB), interleukin-8 (IL-8), and tumor necrosis factor alpha (TNF-a) levels in response to C. butyricum were significantly increased, indicating that HT-29 cells were sensitised by C. butyricum. It is the first time that our findings have showed the specific signaling pathways in HT-29 cells stimulated by C. butyricum, which, at least in part, can help to explain the beneficial properties of C. butyricum.

Empirical Study on Influence Factors of Adaption Intention of Online Customized Marketing System in China

Jing Li,Huangyong Ji,Lili Qi,Mengjiao Li,Danfeng Wang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.6

This paper studies the influence factors and the influence mechanism which effect adoption intention of online customized marketing system, which is based on TRI model and the theory of resistance to marketing persuasion as the main framework of the research model from two aspects of technical and marketing characteristics. According to empirical study based on 303 Chinese users, we found that the user’s optimism, creativity and system inadaptability directly influence on the adoption intention in terms of technology attribution, marketing supply appeal, marketing supply fitness, perceived controlling and perceived pressure influence on the adoption intention in terms of marketing attribute, meanwhile, recommendation fitness are influenced by customized label, customized participation and explanation of recommendation. Marketing supply attractiveness is influenced by product attributes, novelty and form of customized supply. And users’ concern about security of system has no significant influence on users’ adoption of online customized marketing system. The people at different education are different significantly in their adaption attention. Finally management suggestion for operators was given.

Enhanced photocatalytic activity of TiO2/graphene by tailoring oxidation degrees of graphene oxide for gaseous mercury removal

Yu Guan,Tao Hu,Jiang Wu,Lili Zhao,Fengguo Tian,Wei-Guo Pan,Ping He,Xuemei Qi,Fangqin Li,Kai Xu 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

We used a simple method of graphene oxide (GO) preparation with different oxidation levels, and control the properties of the TiO2 nanocrystals by tuning the content and oxidation degree of GO to enhance the photocatalytic performance. During the hydrothermal reaction, reduction of GO, formation of TiO2 and chemical bonds between TiO2 and reduced graphene oxide (RGO) was achieved simultaneously. Characterization results showed that TiO2 properties such as crystalline grain and particle size could be tailored by the amount of functional groups, and that crystallinity was also controlled by GO degrees of oxidation. TiO2/RGO photocatalysts showed great efficiency of mercury oxidation, which reached 83.7% and 43.6% under UV and LED light irradiation, respectively. The effects of crystalline grain size and surface chemical properties on Hg0 removal under LED and UV light irradiation were analyzed. In addition, the properties of the photocatalysts before and after UV illumination were investigated, finding that part of Ti-OH on TiO2 surface transformed to Ti-O-Ti. In a nutshell, this work could provide a new insight into enhancing activity of photocatalysts and understanding the photocatalytic mechanism.

Voluntary running depreciates the requirement of Ca²⁺-stimulated cAMP signaling in synaptic potentiation and memory formation

Zheng, Fei,Zhang, Ming,Ding, Qi,Sethna, Ferzin,Yan, Lily,Moon, Changjong,Yang, Miyoung,Wang, Hongbing Cold Spring Harbor Laboratory Press 2016 Learning & Memory Vol.23 No.8

<P>Mental health and cognitive functions are influenced by both genetic and environmental factors. Although having active lifestyle with physical exercise improves learning and memory, how it interacts with the specific key molecular regulators of synaptic plasticity is largely unknown. Here, we examined the effects of voluntary running on long-term potentiation (LTP) and memory formation in mice lacking type 1 adenylyl cyclase (AC1), a neurospecific synaptic enzyme that contributes to Ca2+-stimulated cAMP production. Following 1 mo of voluntary running-wheel exercise, the impaired LTP and object recognition memory in AC1 knockout (KO) mice were significantly attenuated. Running up-regulated exon II mRNA level of BDNF (brain-derived neurotrophic factor), though it failed to increase exon I and IV mRNAs in the hippocampus of AC1 KO mice. Intrahippocampal infusion of recombinant BDNF was sufficient to rescue LTP and object recognition memory defects in AC1 KO mice. Therefore, voluntary running and exogenous BDNF application overcome the defective Ca2+-stimulated cAMP signaling. Our results also demonstrate that alteration in Ca2+-stimulated cAMP can affect the molecular outcome of physical exercise.</P>