Spatiotemporal Trends of Malaria in Relation to Economic Development and Cross-Border Movement along the China–Myanmar Border in Yunnan Province

Xiaotao Zhao,Weerapong Thanapongtharm,Siam Lawawirojwong,Chun Wei,Yerong Tang,Yaowu Zhou,Xiaodong Sun,Jestumon Sattabongkot,Jaranit Kaewkungwal 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.3

The heterogeneity and complexity of malaria involves political and natural environments, socioeconomic devel- opment, cross-border movement, and vector biology; factors that cannot be changed in a short time. This study aimed to assess the impact of economic growth and cross-border movement, toward elimination of malaria in Yunnan Province during its pre-elimination phase. Malaria data during 2011-2016 were extracted from 18 counties of Yunnan and from 7 villages, 11 displaced person camps of the Kachin Special Region II of Myanmar. Data of per-capita gross domestic prod- uct (GDP) were obtained from Yunnan Bureau of Statistics. Data were analyzed and mapped to determine spatiotemporal heterogeneity at county and village levels. There were a total 2,117 malaria cases with 85.2% imported cases; most im- ported cases came from Myanmar (78.5%). Along the demarcation line, malaria incidence rates in villages/camps in Myanmar were significantly higher than those of the neighboring villages in China. The spatial and temporal trends sug- gested that increasing per-capita GDP may have an indirect effect on the reduction of malaria cases when observed at macro level; however, malaria persists owing to complex, multi-faceted factors including poverty at individual level and cross-border movement of the workforce. In moving toward malaria elimination, despite economic growth, cooperative efforts with neighboring countries are critical to interrupt local transmission and prevent reintroduction of malaria via im- ported cases. Cross-border workers should be educated in preventive measures through effective behavior change com- munication, and investment is needed in active surveillance systems and novel diagnostic and treatment services during the elimination phase.

Elastic-plastic-creep response of multilayered systems under cyclic thermo-mechanical loadings

Xiaotao Zheng,Jiqiang Wang,Wei Wang,Linwei Ma,Wei Lin,Jiuyang Yu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.3

The modified Ohno and Abdel-Karim nonlinear kinematic hardening model considering cyclic hardening and creep effect are developed to investigate the deformation and residual stress of multilayered systems subjected to cyclic thermal and mechanical loads. Results reveal that, if the creep behavior is considered, significant stress relaxation takes place during about the first several cycles, and the accumulated strain of multilayered systems under deformation-controlled loads finally remains constant, which leads to shakedown. Remarkable changes of the residual stress, location of neutral axis and curvature of Si-Cu beams are observed during about the first 100 cycles. Therefore, the proposed model can be used for the engineering design of multilayered systems under complex loads.

A Metadata-based Method for Sharing Multiply Heterogeneous Information

Xiaotao Li,Xiaohui Hu,Weina Lu,Xi Liu 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.3

As users’ requirements for information integration enhance increasingly, how to integrate multiply heterogeneous data in a global sharing system has especially been a challenge for its large scale and diverse formats. To address the above problem, this paper proposes an information sharing approach for multiply heterogeneous data based on a two-layer metadata. Firstly, the architecture of the two-layer metadata is introduced. Secondly, the synchronization between different users for distributed heterogeneous data is realized by sharing table structures. Finally, Lucene search engine combined with the element GM-description of the two-layer metadata is presented to retrieve metadata, which reduces the response time compared to other retrieval methods. The experiment results illustrate the effectiveness of our approach and the conclusion is given.

Application of Nonlinear PID Controller in Superconducting Magnetic Energy Storage

Xiaotao Peng,Shijie Cheng,Jinyu Wen 대한전기학회 2005 International Journal of Control, Automation, and Vol.3 No.2

As a new control strategy, the Nonlinear PID (NLPTD) controller has been introduced successfully in power systems. The controller is free of planting model groundwork during the design procedure and is therefore able to be achieved quite simply. In this paper, a nonlinear PID controller used for a superconducting magnetic energy storage (SMES) unit connected to a power system is proposed. The purpose of designing such a controller is to improve the stability of the power system in a relatively wide operation range. The design procedure takes into account the active and reactive power cooperative control scheme as well as the simple structure so as to be more apt to practical utilization. Simulation is carried out to investigate the performance of the proposed controller in a high order nonlinear power system model under the MATLAB environment. The results show satisfactory performance and good robustness of the controller. The feasibility of the controller is testified as well.

Enhancement of high-order harmonics in a plasma waveguide formed in clustered Ar gas

Geng, Xiaotao,Zhong, Shiyang,Chen, Guanglong,Ling, Weijun,He, Xinkui,Wei, Zhiyi,Kim, Dong Eon The Optical Society 2018 Optics express Vol.26 No.3

Application of Nonlinear PID Controller in Superconducting Magnetic Energy Storage

Peng Xiaotao,Cheng Shijie,Wen Jinyu Institute of Control 2005 International Journal of Control, Automation, and Vol.3 No.S

As a new control strategy, the Nonlinear PID (NLPID) controller has been introduced successfully in power systems. The controller is free of planting model groundwork during the design procedure and is therefore able to be achieved quite simply. In this paper, a nonlinear PID controller used for a superconducting magnetic energy storage (SMES) unit connected to a power system is proposed. The purpose of designing such a controller is to improve the stability of the power system in a relatively wide operation range. The design procedure takes into account the active and reactive power cooperative control scheme as well as the simple structure so as to be more apt to practical utilization. Simulation is carried out to investigate the performance of the proposed controller in a high order nonlinear power system model under the. MATLAB environment. The results show satisfactory performance and good robustness of the controller. The feasibility of the controller is testified as well.

Impact of co-firing lean coal on NOx emission of a large-scale pulverized coal-fired utility boiler during partial load operation

Yang Zheng,Xiaotao Gao,Changdong Sheng 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.4

The present work aimed at combustion optimization of a 1,000MW tower-type ultra-supercritical boiler co-firing a lean coal with bituminous coals for reducing NOX emission particularly at low load operations. Historic operation data were systematically analyzed to investigate the characteristics of NOX emission. Through comparing between lean coal co-firing and sole bituminous coal firing, it was confirmed that, besides the big difference in quality and combustion characteristics of the lean coal from the bituminous coals, the excess air ratio in main combustion zone had a significant effect on NOX emission. Keeping the ratio at properly lower level achieved lower NOX emissions at low load operations. Based on the analyses, in-situ tests successfully brought NOX emissions of co-firing down close to 300mg/m3 at the load of 700MW, demonstrating the effectiveness of combustion optimization for controlling NOX emissions at partial load operation of co-firing.

Method of stress field and stability analysis of bedding rock slope considering excavation unloading

Hui Qin,Xiaotao Yin,Hua Tang,Xu Cheng,Hao Yuan 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.10

The stress state of a slope and its analytical solution are prerequisites for stability analysis. Currently, the limit equilibrium method cannot consider the stress state of slopes, and the solution of bedding slope stress remains in numerical simulations for a long time. In this paper, based on the theory of the elastic stress solution of the wedge top under a concentrated load, the analytical solution of the stress field was obtained using Matlab programming. Unloading stress analysis method (USAM) for determining the sliding surface of the bedding rock slope, safety factor (Fs), and reinforcement forces (Fr) were proposed. The USAM is compared with the Limit Equilibrium Method (LEM) and Finite Element Method (FEM) in terms of the Fs, Fr, sliding surface position, and sliding surface stress. The results show: 1) The analytical stress of the slope can be obtained quickly and conveniently using the USAM, while subsequent programming helps in faster completion of the stability evaluation of the bedding rock slope. Fs, Fr, sliding surface position, and sliding surface stress are all close to the results obtained by the FEM. 2) The USAM is more suitable for analyzing slopes when the angle between the slope surface and structural plane is greater than 20° (θ > 20o) and the slope angle is greater than 45o (β > 45o). 3) Through the analysis of specific engineering cases, the safety factor calculated by USAM are 0.06 and 0.02 larger than those obtained by LEM and FEM, respectively, and the required reinforcement force for the slope is closer to that obtained by FEM. The novel stress and stability analysis method allows for the rapid evaluation and optimal engineering design of bedding rock slope.

Improved dyes separation performance of reduced graphene by incorporation MoS2 nanosheets

Xiaojin Wei,Xiaotao Fan,Yimeng Deng,Liqiang Li,Xiaolong Han,Ping Lu,Chao Huang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-

The hydrothermal reduced graphene (rGO) and the layered MoS2 nanosheets prepared by the liquidphasestripping method were blended, and then the MoS2-rGO composite membranes were preparedon the polyvinylidene fluoride (PVDF) supporting membranes by vacuum filtration method. A varietyof characterization methods such as Fourier transform infrared spectrometer (FT-IR), X-ray photoelectronspectroscopy (XPS) and X-ray diffractometer (XRD) were used to verify the successful introduction ofMoS2 into rGO layers and the changes of interlayer structure of the MoS2-rGO membranes. Finally, theeffect of MoS2 loading on separation performance of the MoS2-rGO composite membrane was investigated. The results show that the separation performance of the membrane with 33.33% of MoS2 loading(MrG3) is the most excellent. The permeability of MrG3 membrane is 118.21 Lm-2h1 bar1, whichis about 4.4 times that of the pristine rGO membrane. Meanwhile, the rejection of the MrG3 membranefor Methyl blue, Crystal violet, Rhodamine B, and Congo red all exceed 80%.

Precision Evaluation of Three-dimensional Feature Points Measurement by Binocular Vision

Guan Xu,Xiaotao Lin,Jian Su,Hongda Pan,Guangdong Tian 한국광학회 2011 Current Optics and Photonics Vol.15 No.1

Binocular-pair images obtained from two cameras can be used to calculate the three-dimensional (3D) world coordinate of a feature point. However, to apply this method, measurement accuracy of binocular vision depends on some structure factors. This paper presents an experimental study of measurement distance, baseline distance, and baseline direction. Their effects on camera reconstruction accuracy are investigated. The testing set for the binocular model consists of a series of feature points in stereo-pair images and corresponding 3D world coordinates. This paper discusses a method to increase the baseline distance of two cameras for enhancing the accuracy of a binocular vision system. Moreover, there is an inflexion point of the value and distribution of measurement errors when the baseline distance is increased. The accuracy benefit from increasing the baseline distance is not obvious, since the baseline distance exceeds 1000 mm in this experiment. Furthermore, it is observed that the direction errors deduced from the set-up are lower when the main measurement direction is similar to the baseline direction.