THE RELATION BETWEEN SANDSTORMS AND STRONG WINDS IN XINJIANG, CHINA

WANG, XU,MA, YU,CHEN, HONGWU,WEN, GANG,CHEN, SHOUJUN,TAO, ZUYU,CHUNG, YONG-SEUNG 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8

With observational data spanning 1961-1999 from 90 meteorological stations in Xinjiang, China, the spatial and temporal characteristics of sandstorms and strong winds, and the contribution of strong winds to the occurrence of sandstorms are analyzed. Moreover, the dominant wind direction and minimum wind speeds during sandstorm periods are discussed. The research shows chat although possessing similar climatic trends, sandstorms and strong winds in Xinjiang have opposite geographical distributions, i.e. places with more sandstorms show fewer strong winds. The contribution of strong winds to sandstorms in northern Xinjiang is larger than that in southern Xinjiang. The dominant wind directions clerarly indicate the paths of the weather systems that introduced the sandstorms. The minimum wind speeds in the sandstoims were ova 10 ms^(-1) in northern and eastern Xinjiang and in the Turpan and Yanqi Basins of southern Xinjiang. In Tarim Basin of southern Xinjiang, however, the minimum wind speed was about 6-8 ms^(-1), and even 6 ms^(-1) at its southero edge.

Optimal placement of piezoelectric curve beams in structural shape control

Wang, Jian,Zhao, Guozhong,Zhang, Hongwu Techno-Press 2009 Smart Structures and Systems, An International Jou Vol.5 No.3

Shape control of flexible structures using piezoelectric materials has attracted much attention due to its wide applications in controllable systems such as space and aeronautical engineering. The major work in the field is to find a best control voltage or an optimal placement of the piezoelectric actuators in order to actuate the structure shape as close as possible to the desired one. The current research focus on the investigation of static shape control of intelligent shells using spatially distributed piezoelectric curve beam actuators. The finite element formulation of the piezoelectric model is briefly described. The piezoelectric curve beam element is then integrated into a collocated host shell element by using nodal displacement constraint equations. The linear least square method (LLSM) is employed to get the optimum voltage distributions in the control system so that the desired structure shape can be well matched. Furthermore, to find the optimal placement of the piezoelectric curve beam actuators, a genetic algorithm (GA) is introduced in the computation model as well as the consideration of the different objective functions. Numerical results are given to demonstrate the validity of the theoretical model and numerical algorithm developed.

Optimal placement of piezoelectric curve beams in structural shape control

Jian Wang,Guozhong Zhao,Hongwu Zhang 국제구조공학회 2009 Smart Structures and Systems, An International Jou Vol.5 No.3

Shape control of flexible structures using piezoelectric materials has attracted much attention due to its wide applications in controllable systems such as space and aeronautical engineering. The major work in the field is to find a best control voltage or an optimal placement of the piezoelectric actuators in order to actuate the structure shape as close as possible to the desired one. The current research focus on the investigation of static shape control of intelligent shells using spatially distributed piezoelectric curve beam actuators. The finite element formulation of the piezoelectric model is briefly described. The piezoelectric curve beam element is then integrated into a collocated host shell element by using nodal displacement constraint equations. The linear least square method (LLSM) is employed to get the optimum voltage distributions in the control system so that the desired structure shape can be well matched. Furthermore, to find the optimal placement of the piezoelectric curve beam actuators, a genetic algorithm (GA) is introduced in the computation model as well as the consideration of the different objective functions. Numerical results are given to demonstrate the validity of the theoretical model and numerical algorithm developed.

Implementation of Fall Detection System Based on Data Fusion Technology

Xianwei Wang,Hongwu Qin 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.4

This paper mainly discusses a fall detecting method for the elderly, implements the wireless positioning and automatic alarm function. The system is designed with low cost Micro-Electro-Mechanical System (MEMS) inertial measurement unit to measures activities data of the elderly people, which has achieved an accurate attitude determination by Kalman filter for the multi-sensor data fusion algorithm, and transfer information to remote medical monitoring system platform by CDMA network, it makes the elderly get treatment in time after the fall. The experiments show that the system can accurately detect the elderly falling, send out alarms and positioning after a fall, its applying will provide a new security guarantee for the elderly health.

Topographic Evolution around Twin Piers in a Tandem Arrangement

Hao Wang,Hongwu Tang,Quanshuai Liu,Xuanyu Zhao 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7

This laboratory study investigates the 2-D topographic evolution of a sand bed with cylindrical bridge piers arranged in tandem. The results of clear-water scouring experiments around two piers show that shapes of topography were similar for different spacing and scour duration. Fractal theory and statistical analysis were used to estimate the statistical properties of the evolution of the sandbed topography around the piers. The statistical properties of the bed surface contours remained almost stationary under continuing scouring action. Finally, the difference of local scour depth between two piers with scour time can be segregated into three regions: sheltering region, co-effect region and stabilizing region.

HMFS : A Hybrid Message Ferrying Scheme for Clustered Opportunistic Networks

Zhang Yushu,Wang Huiqiang,LV Hongwu,Feng Guangsheng,Zhu Jinmei 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.4

Opportunistic network is an evolution of MANETs to delivery messages in intermittent-ly connected or completely disconnected wireless networks. Message ferrying is an effec-tive routing mode in opportunistic networks. However, the single message ferry routing scheme leads a much higher delay as the increasing of the network scale, comparing with that in small scale opportunistic networks. It has been proved that multiple message fer-ries routing scheme can improve the performance of large scale networks, but the prob-lems of synchronization and coordinate between ferries have a bad effect on the routing efficiency. To solve these problems, a Hybrid Message Ferrying Scheme (HMFS) for clus-tered opportunistic networks is proposed. In HMFS, we divide the communication area into multiple regions based on clustering results and several cross zones containing the regions. A local ferry is deployed in each region to deliver messages in the region, and several global ferries are deployed according to horizontal and vertical zones to commu-nicate among the regions. Moreover, each region has a ferry relay node in it, which is used to orchestrate the local ferry and global ferries. Through the theoretical analysis and simulation results, we can see that HMFS can improve the effect of routing in oppor-tunistic networks in terms of network latency and delivery ratio.

Fabrication of Bio-based Coloristic and Ultraviolet Protective Cellulosic Fabric Using Chitosan Derivative and Chestnut Shell Extract

Yanmei Jia,Hongwu Jiang,Yan Wang,Zhimei Liu,Peng Liang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10

The integration of agricultural by-products and natural fibers is increasingly welcomed for sustainablemanufacturing of functional textiles. This study presents a facile strategy for fabricating bio-based coloristic and ultraviolet(UV) protective cellulosic fabric pre-cationized with a chitosan derivative - hydroxypropyltrimethyl ammonium chloridechitosan (HACC) followed by simultaneous coloration and finishing using chestnut shell extract (CSE). Results revealed thatHACC significantly enhanced the CSE adsorption quantity on cellulose fibers due to the increased number of cationicbinding sites. Both cotton and viscose showed a good building up property indicating their potential for dark shade dyeing. Cotton displayed higher CSE adsorption improvement than viscose due to the higher adsorption quantity of HACC duringpre-cationization. The washing and rubbing fastness was rated as mediate to high level, which was contributed by theelectrostatic interactions between the cationized cellulose fiber and anionic CSE. Importantly, the ultraviolet protective factor(UPF) of treated cellulosic reached over 40 and well retained over 70 % after 10 repeated washings. In summary, thefabrication strategy for coloristic and functional cellulosic fabrics using two natural products introduced in this research,contributes to sustainable manufacturing of textile.

Expanding Ring Search Energy Analysis and Optimization for Wireless Sensor Networks

Xiuxiu Wen,Huiqiang Wang,Guangsheng Feng,Hongwu Lv,Junyu Lin,Qiang Zhu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9

Expanding Ring Search (ERS) is an advanced flooding technique exploring for targets progressively. It is widely used to locate destinations or information in wireless sensor networks. In this paper, a fundamental problem concerning the best ERS strategy to minimize energy cost in wireless sensor networks is addressed. We propose a model for estimating the average energy cost of ERS strategies, and a model for comparing the energy cost of an ERS strategy with pure flooding. The second model is then used to prove that incremental ERS strategies are inefficient in large-scale wireless sensor networks. Furthermore, we propose an ERS strategy optimization algorithm SSetOpt, which can be applied to both dense wireless sensor networks and sparse ones. The simulation results show that the strategy obtained by SSetOpt can cost 5% less energy than prior works when the network is sparse, say, the average degree is less than 30..

Comparison of Biological Characteristics of Human Umbilical Cord Wharton’s Jelly-Derived Mesenchymal Stem Cells from Extremely Preterm and Term Infants

Huang Peng,Qin Xiaofei,Fan Chuiqin,Wang Manna,Chen Fuyi,Liao Maochuan,Zhong Huifeng,Wang Hongwu,Ma Lian 한국조직공학과 재생의학회 2023 조직공학과 재생의학 Vol.20 No.5

BACKGROUND: Despite the progress in perinatal-neonatal medicine, complications of extremely preterm infants continue to constitute the major adverse outcomes in neonatal intensive care unit. Human umbilical cord Wharton’s Jellyderived mesenchymal stem cells (HUMSCs) may offer new hope for the treatment of intractable neonatal disorders. This study will explore the functional differences of HUMSCs between extremely preterm and term infants. METHODS: UMSCs from 5 extremely preterm infants(weeks of gestation: 22?5 w,24?4 w,25?3 w,26 w,28 w) and 2 term infants(39 w,39?2 w) were isolated, and mesenchymal markers, pluripotent genes, proliferation rate were analyzed. HUVECs were injured by treated with LPS and repaired by co-cultured with HUMSCs of different gestational ages. RESULTS: All HUMSCs showed fibroblast-like adherence to plastic and positively expressed surface marker of CD105,CD73 and CD90, but did not expressed CD45,CD34,CD14,CD79a and HLA-DR; HUMSCs in extremely preterm exhibited significant increase in proliferation as evidenced by CCK8, pluripotency markers OCT-4 tested by RT-PCR also showed increase. Above all, in LPS induced co-cultured inflame systerm, HUMSCs in extremely preterm were more capable to promote wound healing and tube formation in HUVEC cultures, they promoted TGFb1 expression and inhibited IL6 expression. CONCLUSIONS: Our results suggest that HUMSCs from extremely preterm infants may be more suitable as candidates in cell therapy for the preterm infants.