Comparative analyses of a shield building subjected to a large commercial aircraft impact between decoupling method and coupling method

Pengfei Han,Jingbo Liu,Bigang Fei 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1

Comparative analyses of a shield building subjected to a large commercial aircraft impact betweendecoupling method and coupling method are performed in this paper. The decoupling method isapplying impact force time-history curves on impact area of the shield building to study impact damageeffects on structure. The coupling method is using a model including aircraft and shield building toperform simulation of the entire impact process. Impact force time-history curves of the fuselage, wingand engine and their total impact force time-history curve are obtained by the entire aircraft normallyimpacting the rigid wall. Taking aircraft structure and impact progress into account some loading areasare determined to perform some comparative analyses between decoupling method and couplingmethod, the calculation results including displacement, plastic strain of concrete and stress of steel platein impact area are given. If the loading area is determined unreasonably, it will be difficult to assessimpact damage of impact area even though the accurate impact force of each part of aircraft obtainedalready. The coupling method presented at last in this paper can more reasonably evaluate the dynamicresponse of the shield building than the decoupling methods used in the current nuclear engineeringdesign

Identification and characterization of atypical porcine pestivirus genomes in newborn piglets with congenital tremor in China

Han-Qin Shen,Xiangcong Liu,Pengfei Zhang,Lei Wang,Yan-ling Liu,Le-yi Zhang,Peng-shuai Liang,Chang-xu Song 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.3

Recently, a novel atypical porcine pestivirus (APPV) in pig was reported. In this study, two APPV strains, APPV-China/GZ01/2016 (GZ01) and APPV-China/GD-SD/2016 (GD-SD), were identified in two newborn piglet herds with congenital tremor from China. The open reading frame of the two strains shared an 83.5% nucleotide identity. Phylogenetically, the APPV strains were placed into two groups: GZ01 belonged to group I and GD-SD belonged to group II. A high viral load was detected in the cerebellum (quantification cycles < 26). Further studies should be carried out to thoroughly elucidate the development of congenital tremors caused by APPV.

Development and Testing of a 10 kV 1.5 kA Mobile DC De-Icer based on Modular Multilevel Converter with STATCOM Function

Pengfei Hu,Yiqiao Liang,Yi Du,Renming Bi,Chonglin Rao,Yang Han 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper introduces the development of a de-icer based on a full-bridge modular multilevel converter (FMMC). The FMMC can generate a wide range of DC voltages owing to its modularity, scalability, and redundancy, which makes it suitable for ice-melting applications. First, operating principles and voltage ranges are analyzed when FMMC is applied as a mobile de-icer. Second, two new startup strategies, constant modulation index and constant power startup strategies, are proposed. Third, the main control strategies of the de-icer are proposed. Fourth, a novel rated-current zero-power test scheme is proposed to simplify test conditions. Finally, a 10 kV 1.5 kA mobile MMC de-icer is designed and built, and experiments are carried out to validate the proposed startup, control strategies, and rated-current zero-power test scheme.

Development and Testing of a 10 kV 1.5 kA Mobile DC De-Icer based on Modular Multilevel Converter with STATCOM Function

Hu, Pengfei,Liang, Yiqiao,Du, Yi,Bi, Renming,Rao, Chonglin,Han, Yang The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.2

This paper introduces the development of a de-icer based on a full-bridge modular multilevel converter (FMMC). The FMMC can generate a wide range of DC voltages owing to its modularity, scalability, and redundancy, which makes it suitable for ice-melting applications. First, operating principles and voltage ranges are analyzed when FMMC is applied as a mobile de-icer. Second, two new startup strategies, constant modulation index and constant power startup strategies, are proposed. Third, the main control strategies of the de-icer are proposed. Fourth, a novel rated-current zero-power test scheme is proposed to simplify test conditions. Finally, a 10 kV 1.5 kA mobile MMC de-icer is designed and built, and experiments are carried out to validate the proposed startup, control strategies, and rated-current zero-power test scheme.

Research on Overload Monitoring and Alarming based on APP

Feng Pengfei,Jin Huiqing,Gu Jiangyang,Han Jian 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.11

As the acceleration of urban construction, the dump heavies(building soil-transporting vehicle) shuttle back and forth in urban road. For the sake of profits, the crazy overload transportation makes the vehicles lose braking control and steering ability in emergency state. The common occurrence of traffic disasters brings huge hidden trouble of urban traffic safety. Its harm is self-evident, causing serious damage to infrastructure, to threaten the safety of life and property of the people, to disrupt the market economic order, but also cause environmental pollution. In recent years, the traffic management departments and urban management departments jointly monitor the discharging heavy trucks in the forms of surveillance and reporting by the masses, installing camera and monitor, self-discipline and self-supervision of investors, etc. These forms are limited to the forms and surface, so they cannot effectively stop the overload of self-discharging trucks. How to better and accurately monitor and stop the over-load? The paper intends to achieve intelligent monitoring and alarming on the overload of dump heavy through internet + public transportation monitoring. First the controller is selected and the weighting sensing system is designed through selecting the weighting sensor and determining the installation position of weighting sensor. Then the construction of APP overload monitoring is finished by the three steps including constructing dual-core system, generating database and designing APP display module. Finally after finishing the design of intelligent overload detection system, the paper conducts experiments to validate its effectiveness. The results show that when considering no electromagnetic, the overload equipment and APP software system could receive the overload information timely and reliably.

Effects of Adding Essential Oil to the Diet of Weaned Pigs on Performance, Nutrient Utilization, Immune Response and Intestinal Health

Li, Pengfei,Piao, Xiangshu,Ru, Yingjun,Han, Xu,Xue, Lingfeng,Zhang, Hongyu Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.11

The objective of this study was to evaluate the effects of adding essential oils to the diet of weaned pigs on performance, nutrient utilization, immune response and intestinal health. A total of 96 weaning pigs ($8.37{\pm}1.58$ kg) were allotted to one of three dietary treatments. The treatments consisted of an unsupplemented basal diet (negative control, NC) or similar diets supplemented with 0.01% of an essential oil product which contained 18% thymol and cinnamaldehyde (EOD) as well as a diet supplemented with 0.19% of an antibiotic mixture which provided 150 ppm chlortetracycline, 80 ppm colistin sulfate and 50 ppm kitasamycin (positive control, PC). Each treatment was provided to eight pens of pigs with four pigs per pen. Over the entire 35 d experiment, ADG and fecal score were improved (p<0.05) for pigs fed the PC and EOD compared with the NC. Dry matter and crude protein digestibility as well as lymphocyte proliferation for pigs fed the PC and EOD diets were increased significantly compared with NC (p<0.05). IGF-I levels in plasma were significantly increased (p<0.05) in pigs fed the PC diet compared with pigs fed the NC diet. Interleukin-6 concentration was lower (p<0.05) and the tumor necrosis factor-${\alpha}$ level was higher (p<0.05) in the plasma of pigs fed the EOD diet than the NC diet. Plasma total antioxidant capacity level increased (p<0.05) in pigs fed the EOD diet compared with pigs fed the NC. Villus height to crypt depth ratio in the jejunum was greater (p<0.05) in pigs fed the PC and EOD diets than the NC. The numbers of E. coli in the cecum, colon and rectum were reduced (p<0.05) in pigs fed the PC and EOD diets compared with the control. In the colon, the ratio of Lactobacilli to E. coli was increased (p<0.05) in pigs fed the EOD diet compared with NC diet. Total aerobe numbers in the rectum were decreased (p<0.05) in pigs fed the PC and EOD diets compared with the control. Collectively, these results indicate that blends of essential oils could be a candidate for use as an alternative to traditional antibiotics in weaning pig diets.

Implantation of Adipose-Derived Mesenchymal Stromal Cells (ADSCs)-Lining Prosthetic Graft Promotes Vascular Regeneration in Monkeys and Pigs

Zuo Xiao,Han Pengfei,Yuan Ding,Xiao Ying,Huang Yushi,Li Rui,Jiang Xia,Feng Li,Li Yijun,Zhang Yaya,Zhu Ping,Wang Hongge,Wang Ning,Kang Y. James 한국조직공학과 재생의학회 2024 조직공학과 재생의학 Vol.21 No.4

Background: Current replacement procedures for stenosis or occluded arteries using prosthetic grafts have serious limitations in clinical applications, particularly, endothelialization of the luminal surface is a long-standing unresolved problem. Method: We produced a cell-based hybrid vascular graft using a bioink engulfing adipose-derived mesenchymal stromal cells (ADSCs) and a 3D bioprinting process lining the ADSCs on the luminal surface of GORE-Tex grafts. The hybrid graft was implanted as an interposition conduit to replace a 3-cm-long segment of the infrarenal abdominal aorta in Rhesus monkeys. Results: Complete endothelium layer and smooth muscle layer were fully developed within 21 days post-implantation, along with normalized collagen deposition and crosslinking in the regenerated vasculature in all monkeys. The regenerated blood vessels showed normal functionality for the longest observation of more than 1650 days. The same procedure was also conducted in miniature pigs for the interposition replacement of a 10-cm-long right iliac artery and showed the same long-term effective and safe outcome. Conclusion: This cell-based vascular graft is ready to undergo clinical trials for human patients. Background: Current replacement procedures for stenosis or occluded arteries using prosthetic grafts have serious limitations in clinical applications, particularly, endothelialization of the luminal surface is a long-standing unresolved problem. Method: We produced a cell-based hybrid vascular graft using a bioink engulfing adipose-derived mesenchymal stromal cells (ADSCs) and a 3D bioprinting process lining the ADSCs on the luminal surface of GORE-Tex grafts. The hybrid graft was implanted as an interposition conduit to replace a 3-cm-long segment of the infrarenal abdominal aorta in Rhesus monkeys. Results: Complete endothelium layer and smooth muscle layer were fully developed within 21 days post-implantation, along with normalized collagen deposition and crosslinking in the regenerated vasculature in all monkeys. The regenerated blood vessels showed normal functionality for the longest observation of more than 1650 days. The same procedure was also conducted in miniature pigs for the interposition replacement of a 10-cm-long right iliac artery and showed the same long-term effective and safe outcome. Conclusion: This cell-based vascular graft is ready to undergo clinical trials for human patients.

FREE VIBRATION ANALYSIS OF THIN PLATE WITH ANISOTROPIC COATING CONSIDERING PIEZOELECTRIC AND PIEZOMAGNETIC EFFECT

Yang Zhengxin,Han Qingkai,Dang Pengfei 한국신재생에너지학회 2015 AFORE Vol.2015 No.11

Pleiotropic Functions of Fibroblast Growth Factor Signaling in Embryonic Mammary Gland Development

Kim, Eun-Jung,Jung, Han-Sung,Lu, Pengfei Springer-Verlag 2013 Journal of mammary gland biology and neoplasia Vol.18 No.2

Exploring Resident’s Daily Activity-Travel Behavior: Activity Pattern, Duration and Competition

Wanying Li,Hongzhi Guan,Yan Han,Haiyan Zhu,Pengfei Zhao 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.8

This paper aims to deeply analyze the regularity of residents' daily activity-travel behaviors to help traffic management departments predict travel demand and evaluate transportation policies. Taking time use data in American as empirical analysis, the influencing factors such as residents’ activity pattern, duration and competition were discussed and analyzed based on the competing risk model. Results can be concluded that: a) people feel happy and meaningful during most of the activities, while they feel sad or pain in relatively rare occasions; b) there is no significant difference between young people and the elderly as for the total number of activities during one day; c) estimation results show that personal, household and activity characteristics have significant influence on activity duration and pattern, and the pattern of last activity (N) has a great influence on the occurrence of next activity (N+1); d) the competition between residents' daily activities is confirmed based on the competing risk model, and travel is closely related to various activities and can be seen as the derived demand of various activities. In all combinations of activity-travel chain schedule, personal - household (30.0%), household - recreation (25.9%), work - travel (45.2%), purchase - travel (33.7%), recreation - travel (22.5%), volunteer - travel (55.3%) and travel - purchase (28.4%) have the highest proportion respectively.