Study on Farmland Soil’s Absorption Characteristics to BHC in Northeastern Industrial Polluted Area

Gao Ming,Hua Xiuyi,Dong Deming,Zhao Xingmin 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.6

This article adopts samples from farmland soil in Zhang Yi Zhan, Shenyang City, where is located in China’s northeastern industrial polluted area, assisted by systematic absorption test and soil column device and measuring system, to conduct in-depth study on the transfer rule of a persistent pollutant-organochlorine pesticide (OCP) BHC in soil, by which we could obtain the spatiotemporal variation process of pollutant concentration in unsaturated soil column under certain pollution transport condition. The experiment result indicates, that by comparing the leaching curves of each soil column filled with sample soil collected from various soil layers across the district, we could find that the transfer velocity of BHC in the vadose zone of soil column No. IV(60~80cm) was faster than that in No. I(0~20cm), No. II(20~40cm) and No. III(40~60cm), while that in No. V (80~100cm)was the maximum. This was possibly due to its close to upper soil layer where high content of clay and organic matter exist, while the lower soil layer was nearly sandy with low content of organic matter. However, the proved research shows, that soil's absorptive capacity to BHC would grow with an increase of organic matter content, therefore, the soil column No. V had smaller absorptive capacity than No. IV, and much smaller than No. I, II and III, extending the transfer capacity of pollutant to a larger degree. Namely, once the water body polluted by OCP reached to the lower soil layer of vadose zone, its transfer velocity would accelerate, which could be potentially hazardous to ecological system and underground water. Thus to research on the transfer characteristics of BHC in each soil layer of vadose zone would be of great importance as it would provide theoretical basis for improvement and restoration of soil and underground water pollution.

Letter to the Editor: Cancer Perceptions Among Smokeless Tobacco Users: A Qualitative Study of US Firefighters

Gao, Xiang,Deming, Nathan J.,Cavalier, Alyssa N. Occupational Safety and Health Research Institute 2021 Safety and health at work Vol.12 No.2

Use of multiple inter-reboilers to achieve energy savings and improve thermodynamic efficiency of the distillation of N,N-dimethylformamide wastewater

Xiaoxin Gao,Xueming Yin,Song Yang,Deming Yang 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

The purification of N,N-dimethylformamide wastewater involves an energy intensive distillation process. We propose a novel energy-saving process scheme involving multiple inter-reboilers sed. In this scheme, ideal thermodynamic model non-random two liquid (NRTL) model was used to calculate the phase equilibrium using Aspen Plus platform. While the relationship between important process parameters and energy consumption by the distillation process was studied, several parameters such as the most suitable positions for the inter-reboilers and the most reasonable steam extraction rates were obtained. The feasibility was detected under the same separation duties and main technological structure. For 10wt% DMF wastewater, the inter-reboilers were installed on the 37th, 38th and 39th plates, while the corresponding heat transferred values were 3,038 kW, 91 kW and 179kW, respectively. In comparison to the conventional distillation process, an energy consumption of 77.43% and thermodynamic efficiency of 65.69% were obtained. For 20 wt% DMF wastewater, the inter-reboilers were installed on the 21st and 25th plate, while the corresponding values for the heat transferred were 1,632kW, and 1,450kW, respectively. In comparison to the conventional distillation process, the energy consumption can be reduced by 71.31%, while the thermodynamic efficiency can be improved by 47.10%.

A Tier-Based Duty-Cycling Scheme for Forest Monitoring

Zhang, Fuquan,Gao, Deming,Joe, In-Whee Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.5

Wireless sensor networks for forest monitoring are typically deployed in fields in which manual intervention cannot be easily accessed. An interesting approach to extending the lifetime of sensor nodes is the use of energy harvested from the environment. Design constraints are application-dependent and based on the monitored environment in which the energy harvesting takes place. To reduce energy consumption, we designed a power management scheme that combines dynamic duty cycle scheduling at the network layer to plan node duty time. The dynamic duty cycle scheduling is realized based on a tier structure in which the network is concentrically organized around the sink node. In addition, the multi-paths preserved in the tier structure can be used to deliver residual packets when a path failure occurs. Experimental results show that the proposed method has a better performance.

A Tier-Based Duty-Cycling Scheme for Forest Monitoring

Fuquan Zhang,Deming Gao,조인휘 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.5

Wireless sensor networks for forest monitoring are typically deployed in fields in which manual interventioncannot be easily accessed. An interesting approach to extending the lifetime of sensor nodes is the use ofenergy harvested from the environment. Design constraints are application-dependent and based on themonitored environment in which the energy harvesting takes place. To reduce energy consumption, wedesigned a power management scheme that combines dynamic duty cycle scheduling at the network layer toplan node duty time. The dynamic duty cycle scheduling is realized based on a tier structure in which thenetwork is concentrically organized around the sink node. In addition, the multi-paths preserved in the tierstructure can be used to deliver residual packets when a path failure occurs. Experimental results show thatthe proposed method has a better performance.

A two-stage case-control study of EGFR polymorphisms and breast cancer risk.

Hong, Young-Seoub,Deming, Sandra L,Gao, Yu-Tang,Long, Ji-Rong,Shu, Xiao-Ou,Cai, Qiuyin,Lu, Wei,Zheng, Wei American Association for Cancer Research 2009 Cancer Epidemiology, Biomarkers & Prevention Vol.18 No.2

Numerical investigation on the influence of surface tension and viscous force on the bubble dynamics with a CLSVOF method

Zhiying Wang,Yikai Li,Biao Huang,Deming Gao 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.6

We numerically investigated the rising of bubbles in a quiescent liquid layer. The numerical simulation is performed by solving the incompressible, multiphase Navier-Stokes equations via computational code in axisymmetric coordinates using a Coupled level-set and volume-of-fluid (CLSVOF) method. The numerical results show that the CLSVOF method with a novel algebraic relation between F and f for axisymmetric two-phase flows not only can predict the bubble surface accurately, but also overcome the deficiency in preserving volume conservation. The effects of the Reynolds number Re and the Bond number Bo on the bubble deformation and its motion are investigated. The results show that with the increasing of Re (10 < Re < 150), the bubble shape transfers from oblate ellipsoidal cap to toroidal when Bo = 116. With the increasing of Bo (10 < Bo < 700), the bubble shape transfers from oblate ellipsoidal to toroidal when Re = 30. Although the toroidal bubble shapes are reached in these two cases, the transition modes are different. For the case Bo = 116, the bubble front is pierced by an upward jet from the rear of the bubble. While for the case Re = 30, the rear of the bubble is pierced by a downward jet from the front part.

Numerical simulations and surrogate-based optimization of cavitation performance for an aviation fuel pump

Xing’an Zhao,Biao Huang,Tairan Chen,Guoyu Wang,Deming Gao,Jing Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2

We used computational modeling to investigate the cavitation performance of an aviation fuel pump, and optimize structural parameters using the surrogate-based method. In the numerical simulation, a rotation-curvature correction was adapted to the k-ε turbulence model, and a four-component surrogate fuel was selected to reproduce the physical properties of the China RP-3 kerosene. Then the performance of the aviation fuel pump was predicted. In the optimization, based on the series of the numerical results, Surrogate-based analysis and optimization (SBAO) was used to optimize the structural parameters of the fuel pump (the variation of the outlet blade angle for the inducer △β b1 and the variation of the inlet blade angle for the impeller △β b2 ). The results show that the prediction of cavitation performance agrees well with the experimental data. The results show that cavitation areas are mainly distributed in the inlet of the inducer. The volume of cavities grows with the decreasing NPSHa. The head of the fuel pump has a sudden head-drop when NPSHa ≤ 5.64 m. Furthermore, the surrogate-based approach is available in structural optimization of the fuel pump. The cavitation performance of the optimized pump improved about 22 % with a little drop of head coefficient when △β b1 = 4.33° and △β b2 = 3.24°. The numerical approach employed in this paper can accurately predict the cavitating flow of the high rotating speed fuel pump and the surrogate-based method is available in the structural optimization for a better cavitation performance.