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A Novel Hyperspectral Microscopic Imaging System for Evaluating Fresh Degree of Pork
Yi Xu,Quansheng Chen,Yan Liu,Xin Sun,Qiping Huang,Qin Ouyang,Jiewen Zhao 한국축산식품학회 2018 한국축산식품학회지 Vol.38 No.2
This study proposed a rapid microscopic examination method for pork freshness evaluation by using the self-assembled hyperspectral microscopic imaging (HMI) system with the help of feature extraction algorithm and pattern recognition methods. Pork samples were stored for different days ranging from 0 to 5 days and the freshness of samples was divided into three levels which were determined by total volatile basic nitrogen (TVB-N) content. Meanwhile, hyperspectral microscopic images of samples were acquired by HMI system and processed by the following steps for the further analysis. Firstly, characteristic hyperspectral microscopic images were extracted by using principal component analysis (PCA) and then texture features were selected based on the gray level co-occurrence matrix (GLCM). Next, features data were reduced dimensionality by fisher discriminant analysis (FDA) for further building classification model. Finally, compared with linear discriminant analysis (LDA) model and support vector machine (SVM) model, good back propagation artificial neural network (BP-ANN) model obtained the best freshness classification with a 100 % accuracy rating based on the extracted data. The results confirm that the fabricated HMI system combined with multivariate algorithms has ability to evaluate the fresh degree of pork accurately in the microscopic level, which plays an important role in animal food quality control.
Kehui, Ouyang,Wenjun, Wang,Mingshen, Xu,Yan, Jiang,Xinchen, Shangguan Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.6
In order to understand the effects of different oils on the production performances and polyunsaturated fatty acids and cholesterol level in the yolk. 160 Hexices hens at 42 wks were divided into four groups randomly. Each group fed with control diet (CG), control diet+5% fish oil (FG), control diet+5% palm oil (PG) and control diet+5% soybean oil (SG), respectively. After three weeks' experiment, the results showed that: different oils showed no significant effect on feed/egg weight, egg white weight, body weight, C16, C18:3 n-6 and C20:4 n-6 contents in the yolk (p>0.05). But the egg mass of PG was higher than SG (p<0.05), the average egg weight of CG was lower than FG (p<0.05), and the of PG was lower than FG (p<0.05), during the experiment, FG gained more than SG (p<0.05), the cholesterol level in yolk of FG was lower than PG and CG (p<0.01), meanwhile the C20:5 n-3 content of FG was higher than CG and SG (p<0.01), and no C20:5 n-3 was detected in PF, as far as C22:6 n-3 in the yolk was concerned, FG was higher than PG (p<0.01), the C18:1 n-9 content of SG was lower than PG (p<0.05), the C18:2 n-6 content of SG was the highest than other three groups (p<0.01), and CG was the lowest, showed significant to FG (p<0.05), the C18:3 n-3 content of FG was higher than SG and PG (p<0.05), and the C20:1 n-9 content of FG was higher than other groups (p<0.01). The results demonstrated that fish oil could decrease the cholesterol and increase the n-3 fatty acids content in the yolk, and increase the n-3/n-6 level.
Anti-sway Controls of Double-pendulum Rotary Cranes
Xiang Xu,Huimin Ouyang 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
Crane systems with double-pendulum effect seem more practical than those with single-pendulum effect. However, in these cases the load sway properties become more complicated so that the difficulty of the dynamic performance analysis and controller design is increased. In order to solve the aforementioned problems, the linear dynamics of a rotary crane with double-pendulum effect is derived based on disturbance observers, and is decoupled for controller design by modal analysis. Next, an S-shaped curve is generated on the basis of the decoupled linear crane model for suppressing residual double-pendulum load sway. Parameters of the trajectory can be easily obtained by calculating algebraic equations. Finally, simulation results validate the effectiveness of the proposed method.
Xingguang Xu,Jian Ouyang,Yuanyuan Wang,Chao Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.55 No.-
This work presents the synthesis and characterization of a new polymer, named AVS, which not only thickens the displacing fluid at high salinity and/or elevated temperature, but also emulsifies the crude oil. The results demonstrate AVS solution displays 50% higher apparent viscosity than the commonly used hydrolysed polyacrylamide (HPAM) solution in the same testing conditions. Furthermore, compared to HPAM, AVS has greater capacity to resist the shearing stress. Finally, core flooding experiments verify the AVS solution recovers more incremental oil than HPAM solution does, which is mostly attributed to its outstanding ability to simultaneously enhance the sweep efficiency and the displacement efficiency.
Improving the thermoelectric properties of carbon nanotubes through introducing graphene nanosprings
Xiaoyan Xu,Huaping Xiao,Tao Ouyang,Jianxin Zhong 한국물리학회 2020 Current Applied Physics Vol.20 No.1
Carbon nanotube (CNT) is a typical one-dimensional nanomaterial containing sp2 hybridization states. In this paper, we investigate the ballistic thermoelectric performance of CNTs incorporating graphene nanosprings by using non-equilibrium Green's function. The calculations reveal that the thermoelectric figure of merit could be obviously improved by introducing graphene nanosprings, which is about ten times of that of pristine CNTs at 700 K. Such enhancement is mainly attributed to the remarkable suppression of phononic and electronic thermal conductance and improvement of Seebeck coefficient. In addition, compared to the zigzag graphene nanospring, introducing of the armchair case possesses better thermoelectric performance. The results presented in this paper indicate that embedding graphene nanospring is a viable method to optimize the thermoelectric performance of CNTs and could provide useful theoretical guidance for design and fabrication of CNTs-based thermoelectric devices
Wence Xu,Zhao Cao,Rui Ma,Nannan Wu,Shunli Ouyang 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
Slag glass-ceramics doped with different proportions of CeO2 were prepared by fusion casting method using iron tailings andfly ash as raw materials. The effect of CeO2 on the activation energy and crystallization pattern of glass-ceramics under theeffect of ohmic thermal radiation and microwave radiation was investigated. The experimental results show that thecrystallization activation energy of glass-ceramics gradually increases with the addition of CeO2, and the diopside crystallizationis suppressed. Compared with conventional heat-treated samples, microwave irradiation effectively reduces the glass transitiontemperature, mainly depending on the enhanced crystallization kinetics by microwave non-thermal effects. Further analyzedby Raman spectroscopy, the microwave effect promoted the combination of Ce4+ with [SiO4] to generate fully depolymerizedQ0, inhibited the generation of Q2 and Q3, and increased the glass stability.
Xingguang Xu,Jian Ouyang,Yuanyuan Wang,Chao Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
This work presents the synthesis and characterization of a new polymer, named AVS, which not onlythickens the displacingfluid at high salinity and/or elevated temperature, but also emulsifies the crudeoil. The results demonstrate AVS solution displays 50% higher apparent viscosity than the commonly usedhydrolysed polyacrylamide (HPAM) solution in the same testing conditions. Furthermore, compared toHPAM, AVS has greater capacity to resist the shearing stress. Finally, coreflooding experiments verify theAVS solution recovers more incremental oil than HPAM solution does, which is mostly attributed to itsoutstanding ability to simultaneously enhance the sweep efficiency and the displacement efficiency.
Chongli Xu,Yu Liu,Yuchen Gong,Xinping Duan,Xiaochun Tang,Mingjun Zhang,Daxin Pang,Liqing Yu,Hongwei Zhao,Hongsheng Ouyang 한국유전학회 2015 Genes & Genomics Vol.37 No.2
Although Niemann-Pick C1-Like 1 (NPC1L1)plays a key role in intestinal cholesterol absorption, regulatingcholesterol metabolism and maintaining cholesterolmetabolic homeostasis, the molecular mechanism ofNPC1L1 in lipid-metabolism disorders leading to liverdisease remains largely unknown. Previous studies haveshown that NPC1L1 is related with the development offatty liver. Therefore, we hypothesized that NPC1L1 playsan important role in lipid-metabolism disorders and liverdisease by affecting the transcription of certain genesinvolved in lipid synthesis. To further elucidate the functionof NPC1L1, especially in the liver, we used somaticcellnuclear transfer to establish transgenic pigs thatexpressed human NPC1L1 in their livers. We investigatedsuperoxide dismutase activities and the levels of free fattyacids and malondialdehyde, a biomarker of lipid peroxidation. Superoxide dismutase activities significantlydecreased, and free fatty acid and malondialdehyde levelssignificantly increased in the NPC1L1 transgenic pigs,indicating that the overexpression of NPC1L1 in the liverresulted in severe lipid peroxidation. Our findings suggestthat NPC1L1 plays an important role in lipid-metabolismdisorders and liver disease.
Wang, Wenjun,Ouyang, Kehui,Su, Xifan,Xu, Mingsheng,Shangguan, Xinchen Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.11
The polymorphism of insulin-like growth factor I receptor (IGFIR) gene in 12 pig breeds (total n = 593) was detected by PCR-SacII-restriction fragment length polymorphism and allele A (379 bp) or allele B (235 bp and 144 bp) observed. In the studied breeds, it was found that European pigs principally carried allele A, while Chinese native pig breeds principally carried allele B. In addition, the role of pig IGFIR was investigated in 156 Wanbai pigs and 212 Large Yorkshire pigs. Growth related variables including body weight at birth, 2-, 4- and 6-mo of age and backfat thickness and lean percentage estimated by ultrasonography at 6-mo of age were recorded in analyzing the association between IGFIR gene polymorphism and growth traits. AA-genotype pigs exhibited greater (p<0.05) body weights (BW) at birth, 2- and 6-mo of age, but not at 4-mo of age, than those of the BB-genotype in Wanbai and Yorkshire breeds. Moreover, in the Yorkshire breed, AA-genotype pigs had less backfat thickness (p<0.05) and greater lean percentage (p<0.01) than the BB genotype. Based on these results, it is necessary to do more studies on IGFIR before introducing the IGFIR locus into breeding programs.