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Protein and polyphenols involved in sediment formation in cloudy litchi juice
Dan Zeng,Gengsheng Xiao,Yujuan Xu,Bo Zou,Jijun Wu,Yuanshan Yu 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.4
Sedimentation is a major issue in juice production. This paper aims to study the mechanisms of precipitateformation during the storage of cloudy litchi juice. Thesediment concentration, relative turbidity, and f potentialwere analyzed. The supernatant and sediment were separatedto determine the contents of proteins and phenolics. The results showed that the amount of sediment increasedduring the storage. In addition, the total protein and totalphenolic content in the supernatant decreased, whereas theglutelin and total phenolic contents in the sedimentincreased significantly (p\0.05). Moreover, our resultsshowed that the amounts of procyanidin B2 and quercetin-3-O-rutinose-7-O-rhamnoside in the supernatant decreasednoticeably. However, these two substances could not bedetected in the sediment. In summary, the formation ofsediment from litchi juice is mainly caused by the slowdenaturation of proteins and the oxidation of procyanidinB2 and quercetin-3-O-rutinose-7-O-rhamnoside.
A Novel Approach to Mugshot Based Arbitrary View Face Recognition
Dan Zeng,Shuqin Long,Jing Liu,Qijun Zhao 한국광학회 2016 Current Optics and Photonics Vol.20 No.2
Mugshot face images, routinely collected by police, usually contain both frontal and profile views. Existing automated face recognition methods exploited mugshot databases by enlarging the gallery withsynthetic multi-view face images generated from the mugshot face images. This paper, instead, proposesto match the query arbitrary view face image directly to the enrolled frontal and profile face images. Duringmatching, the 3D face shape model reconstructed from the mugshot face images is used to establishcorresponding semantic parts between query and gallery face images, based on which comparison is done. The final recognition result is obtained by fusing the matching results with frontal and profile face images. Compared with previous methods, the proposed method better utilizes mugshot databases without usingsynthetic face images that may have artifacts. Its effectiveness has been demonstrated on the Color FERETand CMU PIE databases.
A Stable Gait Planning Method of Biped Robot Based on Ankle motion Smooth Fitting
Dong En Zeng,Wang Dan Dan,Tong Ji Gang,Chen Chao,Wang Zeng Hui 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
In ankle joint trajectory planning of biped robots, the spline interpolation generally leads to acceleration mutations on the key points, which weakens the stability of the biped robot. To solve this problem, a smooth function fitting method on ankle joint trajectory planning is proposed in this paper. In this method, the higher order derivatives of the ankle joint trajectory is smooth, and the acceleration mutation can be avoided. The biped robot gait planning of a whole cycle is accomplished by calculating the joint angle sequences of hip, knee and ankle. The effectiveness of the proposed method is demonstrated by numerical simulations on NAO robot gait planning. Experimental results show that the proposed method can improve the stability of the zero moment point (ZMP) margin effectively when it is applied to the bipedal robot gait planning on the non-horizontal ground.
Experimental and numerical studies on mechanical behavior of buried pipelines crossing faults
Dan F. Zhang,Xue M. Bie,Xi. Zeng,Zhen. Lei,Guo F. Du 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.1
This paper presents a study on the mechanical behavior of buried pipelines crossing faults using experimental and numerical methods. A self-made soil-box was used to simulate normal fault, strike-slip fault and oblique slip fault. The effects of some important parameters, including the displacement and type of fault, the buried depth and the diameter of pipe, on the deformation modes and axial strain distribution of the buried pipelines crossing faults was studied in the experiment. Furthermore, a finite element analysis (FEA) model of spring boundary was developed to investigate the performance of the buried pipelines crossing faults, and FEA results were compared with experimental results. It is found that the axial strain distribution of those buried pipelines crossing the normal fault and the oblique fault is asymmetrical along the fault plane and that of buried pipelines crossing the strike-slip fault is approximately symmetrical. Additionally, the axial peak strain appears near both sides of the fault and increases with increasing fault displacement. Moreover, the axial strain of the pipeline decreases with decreasing buried depth or increasing ratios of pipe diameter to pipe wall thickness. Compared with the normal fault and the strike-slip fault, the oblique fault is the most harmful to pipelines. Based on the accuracy of the model, the regression equations of the axial distance from the peak axial strain position of the pipeline to the fault under the effects of buried depth, pipe diameter, wall thickness and fault displacement were given.
Reactive Power-Voltage Integrated Control Method Based on MCR
Dan Chen,Xiaosheng Huang,Guangsheng Li,Yi Wei,Wenjun Zeng,Chuihua Tian,Huan Shi,Hua Ye 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
In power system, the voltage pulsation and deficiency or surplus of reactive power will have a great effect on the quality of electric power supply. Dynamicly local reactive power compensation is one of the best methods to reduce the power network loss and improve the efficiency of transmission and distribution.Through the effective methods of compensation, we can keep the balance of reactive power in the maximum degree by the maintenance of acceptable voltage. This paper firstly describes the principles of synthetic compensation of reactive power and voltage then analyzes the principle of magnetically controlled reactor-MCR in detail and derives the characteristics, secondly analyses the disadvantages of the conventional reactive power compensation devices and the advantages of MCR, thirdly on this basis designs a control strategy of reactive power and voltage which is based on MCR,so as to achieve the goal of dynamic reactive power compensation. At the end of paper, simulator and experimental research are carried out for the model of compensation method; the results accord with the theoretical analyses done before. So the compensation method is proved to be accurate in theory and feasible in practice.
Dan Zong,Li Yin,Qian Zhong,Wen-jie Guo,Jian-hua Xu,Ning Jiang,Zhi-rui Lin,Man-zhi Li,Ping Han,Lin Xu,Xia He,Mu-sheng Zeng 대한암학회 2016 Cancer Research and Treatment Vol.48 No.1
Purpose The purpose of this study was to investigate the function of Zinc finger protein 488 (ZNF488) in nasopharyngeal carcinoma (NPC). Materials and Methods The endogenous expression of ZNF488 in NPC tissues, normal nasopharyngeal epithelium tissues and NPC cell lines were detected by quantitative reverse transcription polymerase chain reaction. ZNF488 over-expressing and knock-down NPC cell line models were estab- lished through retroviral vector pMSCV mediated over-expression and small interfering RNA (siRNA) mediated knock-down. The invasion and migration capacities were evaluated by wound healing and transwell invasion assays in ZNF488 over-expressing and control cell lines. Soft-agar colony formation and a xenograft experiment were performed to study tumorigenic ability in vitro and in vivo. Immunofluorescence and western blotting analysis were used to examine protein changes followed by ZNF488 over-expression. Microarray analysis was performed to explore gene expression profilings, while luciferase reporter assay to evaluate the transcriptive activity of Tcf/Lef. Results ZNF488 was over-expressed in NPC tissues compared with normal tissues, especially higher in 5-8F and S18, which are well-established high metastatic NPC clones. Functional studies indicate that over-expression of ZNF488 provokes invasion, whereas knock-down of ZNF488 alleviates invasive capability. Moreover, over-expression of ZNF488 promotes NPC tumor growth both in vitro and in vivo. Our data further show that over-expression of ZNF488 induces epithelial mesenchymal transition (EMT) by activating the WNT/β -catenin signaling pathway. Conclusion Our data strongly suggest that ZNF488 acts as an oncogene, promoting invasion and tumorigenesis by activating the Wnt/β -catenin pathway to induce EMT in NPC.
A Pore Size Distribution-Based Microscopic Model for Evaluatingthe Permeability of Clay
Qian-Feng Gao,Dan Zhao,Ling Zeng,Hui Dong 대한토목학회 2019 KSCE Journal of Civil Engineering Vol.23 No.12
This work aimed to propose a semi-empirical model that predicts the permeability of saturated clay using the data of mercury intrusion porosimetry (MIP). First, the pore size distribution (PSD) curve obtained from an MIP test was regarded as a discrete probability function of pore diameters; thus, its shape could be characterized by probability parameters (e.g., the expected value and the standard deviation). Subsequently, these probability parameters, combined with the microporosity calculated from the volume of intruded mercury, were correlated with the permeability of clay based on Hagen-Poiseuille's equation. Next, the performance of the proposed permeability model was verified using data reported in the literature. Thereafter, the model was applied to estimate the permeability of normally consolidated (NC) and overconsolidated (OC) kaolin subjected to various triaxial loading. The results highlighted that the proposed model is capable of characterizing the sensitive variation of kaolin permeability under different overconsolidation ratios (OCRs), stress paths, and stress levels.
The Potentials in Solar Cells for MEH-PPV Derivatives: Molecular Design and Performance Prediction
Xiaohua Xie,Xu Liu,Dan Zeng,Longfeng Zhao 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.7
In this contribution, the polymer poly(2-methoxy-5(2?-ethyl-hexyloxy)-1,4-phenylene vinylene) (MEH-PPV) is researched at the aspect of electronic and structural properties to locate the relationships between structures and the experimental properties by employing DFT and TD-DFT method. The studied properties refer to the geometry features, absorption spectra, frontier molecular orbital properties, hole transport properties, and exciton dissociation ability at polymer/PC61BM interface. In addition, four MEH-PPV derivatives, MEH-PPV substituted with F atoms, are designed and studied through comparing with the properties of MEH-PPV. The results indicate that MEH-PPV has low HOMO levels and large hole transport property, which result in its preferable performance. Besides, the designed polymers are promising candidates as PSC donors due to better exciton dissociation ability and larger theoretical VOC owing to lower highest occupied molecule levels, in special, MEH-PPV-Fc has better hole transport properties than MEH-PPV due to smaller m*.