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Kong, Xiangfeng,Yin, Yulong,Wu, Guoyao,Liu, Hejun,Yin, Fugui,Li, Tiejun,Huang, Ruilin,Ruan, Zheng,Xiong, Hua,Deng, Zeyuan,Xie, Mingyong,Liao, Yiping,Kim, Sungwoo Asian Australasian Association of Animal Productio 2007 Animal Bioscience Vol.20 No.9
This study was conducted to test the hypothesis that dietary supplementation with an herbal extract of Acanthopanax senticosus (AS) enhances the immune response in weaned piglets. Sixty piglets weaned at 21 days of age were randomly assigned to 3 treatment groups representing the addition of 0 or 1 g/kg of the AS extract or 0.2 g/kg of colistin (an antibiotic) to maize- and soybean meal-based diets (n = 20 per group). On days 7, 14 and 28 after initiation of the addition, total and differential counts of leucocytes, proliferating activity of peripheral lymphocytes, serum levels of immunoglobulins (Ig) and cytokines and the spleen index were determined. The AS extract decreased (p<0.05) the number of neutrophils on days 7 and 28 in comparison with the control group and reduced (p<0.05) serum interleukin-$1{\beta}$ level on day 28 compared with the other 2 groups. Dietary supplementation with the AS extract increased (p<0.05) the lymphocyte/leukocyte ratio on day 28 compared with the control group and increased the proliferating activity of lymphocytes on days 14 and 28 compared with the other 2 groups. The AS extract increased (p<0.05) the serum content of IgG on day 7 and of IgG and IgM on day 28 compared with the other 2 groups, as well as increasing the serum content of tumor necrosis factor on day 7 and spleen index on days 7 and 28 compared with the control group. Collectively, these findings suggest that the AS extract as a dietary additive enhances the cellular and humoral immune responses of weaned piglets by modulating the production of immunocytes, cytokines and antibodies.
Monitoring moisture content of timber structures using PZT-enabled sensing and machine learning
Qingzhao Kong,Lin Chen,Hai-Bei Xiong,Yufeng He,Xiuquan Li 국제구조공학회 2022 Smart Structures and Systems, An International Jou Vol.29 No.4
Timber structures are susceptible to structural damages caused by variations in moisture content (MC), inducing severe durability deterioration and safety issues. Therefore, it is of great significance to detect MC levels in timber structures. Compared to current methods for timber MC detection, which are time-consuming and require bulky equipment deployment, Lead Zirconate Titanate (PZT)-enabled stress wave sensing combined with statistic machine learning classification proposed in this paper show the advantage of the portable device and ease of operation. First, stress wave signals from different MC cases are excited and received by PZT sensors through active sensing. Subsequently, two non-baseline features are extracted from these stress wave signals. Finally, these features are fed to a statistic machine learning classifier (i.e., naive Bayesian classification) to achieve MC detection of timber structures. Numerical simulations validate the feasibility of PZT-enabled sensing to perceive MC variations. Tests referring to five MC cases are conducted to verify the effectiveness of the proposed method. Results present high accuracy for timber MC detection, showing a great potential to conduct rapid and long-term monitoring of the MC level of timber structures in future field applications.
Identification of Bridge Scour Depth by Tracing Dynamic Behaviors of Superstructures
Wen Xiong,C.S. Cai,Bo Kong,Pingbo Tang,Jianshu Ye 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
A methodology to identify and analyze the bridge scour depth by tracing the dynamic behaviors of superstructures was developed. This proposed methodology basically relies upon the bridge scour-induced effects on the variations of two dynamic features ofsuperstructures, i.e., the natural frequency of vibration and mode of vibration. Firstly a flexibility matrix incorporating the twodynamic features is deduced for bridges under scour conditions. Then, using the scour-induced variations of such flexibility matrix, anew parameter of “[D]-based deflection change” Δδ is defined as an important index for identifying the scour depth. Such an indexΔδ is determined by both FEM (Finite Element Method) simulations and on-site measurements on the dynamic features ofsuperstructures. By doing this, the scour depths corresponding to the measured Δδ are back-deduced based on a pre-simulatedrelationship between Δδ and scour depths. A case study based on the simulation and a demonstration based on actual field data arefinally given to demonstrate the application procedure and qualitatively verify the feasibility of the proposed methodology. Thismethodology does not require any continuous and long-term bridge monitoring using underwater instrumentations and could beconveniently integrated to a routine assessment or structural monitoring system.
Time-variant structural fuzzy reliability analysis under stochastic loads applied several times
Yongfeng Fang,Jianbin Xiong,Kong Fah Tee 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.3
A new structural dynamic fuzzy reliability analysis under stochastic loads which are applied several times is proposed in this paper. The fuzzy reliability prediction models based on time responses with and without strength degeneration are established using the stress-strength interference theory. The random loads are applied several times and fuzzy structural strength is analyzed. The efficiency of the proposed method is demonstrated numerically through an example. The results have shown that the proposed method is practicable, feasible and gives a reasonably accurate prediction. The analysis shows that the probabilistic reliability is a special case of fuzzy reliability and fuzzy reliability of structural strength without degeneration is also a special case of fuzzy reliability with structural strength degeneration.
THE GAITS AND WALKING CONTROL OF HT-II QUADRUPED WALKING ROBOT
Rong, Hong Bing,Gang, Kong Fan,Biao, Chen Xiong,Yi, Wang Shu 대한전자공학회 1992 HICEC:Harbin International Conference on Electroni Vol.1 No.1
This paper proposes three kinds of gait for HT-II Quadruped Walking Robot. In order that HT-II Quadruped Walking Robot is able to walk stably on ground, a software is developed which consists of three parts; gait-table produce programe ; gait-table check programe and joint drive programe. These three kinds of gait form the basis for further studying of fusing of static and dynamic gaits.
Ya-Feng Song,Xiong-Xiong Kong,Wei-Bin Tang,Zhong-Qiang Suo,Huan Zhang,Chen-Yang Li,Qian Jia,Cai-Xia Xue,Yan-Wu Lu,Chao-Pu Yang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.11
We investigate the polarization effect in intersubband transitions in polar and nonpolar GaN-based multiple-quantum well (MQW) structures for terahertz (THz) emissions by using systematic comparisons and design a nonpolar GaN/Al$_{0.2}$Ga$_{0.8}$N two-well-based MQW structure with an emitting photon of 7.27 THz (30.07 meV). Its lower energy separation (92.7 meV) matches the resonant phonon depopulation condition for better population inversion. It shows a lower threshold current density $J\rm_{th}$ at all temperatures (1.548 kA/cm$^2$ at 90 K) and a higher output power of up to 86.1 mW at 5.8 K and 33.6 mW at 100 K. Our results for the polar GaN MQW are very close to the experimental data in the literature. We find that the $J\rm_{th}$ of the nonpolar GaN MQW increases more slowly than that of the polar GaN MQW as temperature increases, indicating the nonpolar GaN MQW may be a worth-trying direction for improving the operation temperature. These results can provide meaningful references for the design and fabrication of nonpolar GaN-based THz MQW or quantum cascade structures.
The Role of the Lysyl Oxidases in Tissue Repair and Remodeling: A Concise Review
Linyi Cai,Xin Xiong,Xiangli Kong,Jing Xie 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.1
Tissue injury provokes a series of events containing inflammation, new tissue formation and tissue remodeling which are regulated by the spatially and temporally coordinated organization. It is an evolutionarily conserved, multicellular, multi-molecular process via complex signalling network. Tissue injury disorders present grievous clinical problems and are likely to increase since they are generally associated with the prevailing diseases such as diabetes, hypertension and obesity. Although these dynamic responses vary not only for the different types of trauma but also for the different organs, a balancing act between the tissue degradation and tissue synthesis is the same. In this process, the degradation of old extracellular matrix (ECM) elements and new ones’ synthesis and deposition play an essential role, especially collagens. Lysyl oxidase (LOX) and four lysyl oxidase-like proteins are a group of enzymes capable of catalyzing cross-linking reaction of collagen and elastin, thus initiating the formation of covalent cross-links that insolubilize ECM proteins. In this way, LOX facilitates ECM stabilization through ECM formation, development, maturation and remodeling. This ability determines its potential role in tissue repair and regeneration. In this review, based on the current in vitro, animal and human in vivo studies which have shown the significant role of the LOXs in tissue repair, e.g., tendon regeneration, ligament healing, cutaneous wound healing, and cartilage remodeling, we focused on the role of the LOXs in inflammation phase, proliferation phase, and tissue remodeling phase of the repair process. By summarizing its healing role, we hope to shed light on the understanding of its potential in tissue repair and provide up to date therapeutic strategies towards related injuries.
Kaiguang Luo,Shilei Liu,Hanqing Xiong,Yun Zhang,Charlie Kong,Hailiang Yu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.11
1 − 6 wt% Al0.5CoCrFeNihigh-entropy alloy particles (HEAp)/AA1050 aluminum matrix composites (AMCs) were preparedby stir casting process. The effect of HEAp mass fractions on microstructure and mechanical properties of the AMCswas studied. The results showed that with the increase in HEAp, the grains were obviously refined, and the ultimate tensilestrength (UTS) was gradually increased. The AA1050 − 3 wt% HEAp AMCs had the optimum mechanical properties. ItsUTS was 115 MPa and its elongation was 32.1%. The fracture mechanism of composites changed from ductile fracture toquasi-cleavage fracture with more HEAp. A theoretical model for predicting the yield strength of composites was established. The theoretical values were in good agreement with experimental results, and the average error between theoreticaland experimental values was 4.2%.