scholarly journals Pumping Well Layout Scheme Design and Sensitivity Analysis of Total Critical Pumping Rates in Coral Island Based on Numerical Model

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3215
Author(s):  
Ran Wang ◽  
Longcang Shu ◽  
Yuxi Li ◽  
Portia Annabelle Opoku
Keyword(s):  
Risk Factors ◽  
Orthogonal Experimental Design ◽  
Sustainable Yield ◽  
Groundwater Abstraction ◽  
Range Analysis ◽  
Hydrogeological Parameters ◽  
Hydrogeological Characteristics ◽  
Pumping Rates ◽  
Freshwater Lenses ◽  
Coral Islands

Groundwater on small coral islands exists in the form of freshwater lenses that serve as an important water resource for local inhabitants and ecosystems. These lenses are vulnerable to salinization due to groundwater abstraction and precipitation variation. Determination of the sustainable yield from freshwater lenses is challenging because the uncertainties of recharge and hydrogeological characteristics make it difficult to predict the lens response to long-term pumping. In this study, nine pumping well layout schemes along a line are designed using the orthogonal experimental design method, and an optimal well layout scheme is determined by multi-index range analysis and comprehensive balance analysis method. The total critical pumping rates of the freshwater lens corresponding to different schemes are calculated by numerical simulation, and the sensitivity of the total critical pumping rates to hydrogeological parameters is analyzed. The results show that the calculation of the total critical pumping rates needs to be combined with the specific well layout scheme with consideration to the length of well screens, the number of wells and the distance between wells. The difference in total critical pumping rates between different schemes can be up to three times. The uncertainty of hydrogeological parameters has a great impact on the total critical pumping rates. Within the range of a 30% reduction in parameters, α and K are the key risk factors of pumping; within the range of a 30% increase in parameters, α, ne and K are the key risk factors; α-ne combined changes had the greatest impact. The management of freshwater lenses and the assessment of sustainable yield will continue to be important tasks for coral islands in the future, and this study can help with the sustainable exploitation of island freshwater lenses.

Effects on the Transparency of Corn Starch Dumpling Wrappers

2012 ◽  
Vol 554-556 ◽  
pp. 1049-1052
Author(s):  
Jun He Zhang ◽  
Guang Lei Li ◽  
Jie Zeng
Keyword(s):  
Water Temperature ◽  
Corn Starch ◽  
Design Method ◽  
Orthogonal Experimental Design ◽  
Water Addition ◽  
Range Analysis ◽  
Technical Parameters ◽  
Experimental Design Method ◽  
Dumpling Wrappers ◽  
Temperature Water

Effects of the water temperature, water addition, sucrose and the phosphate monoester starch on the transparency of corn starch dumpling wrappers were investigated by orthogonal experimental design method. Range analysis and variance analysis methods were carried out to analyse the test results. The results showed that the phosphate monoester starch significantly affected the transparency of corn starch dumpling wrappers (p=0.0414＜0.05), then followed by water temperature, water addition and sucrose in sequence. The optimal technical parameters of corn starch dumpling wrappers were as follows: water temperature 90°C, water addition100%, sucrose 1~1.5%, and phosphate monoester starch 7% (count as corn starch ).

An Approximate Analytical Solution of the Problem of Fluid Filtration in the Multilayer Porous Medium

2016 ◽  
Vol 13 (06) ◽  
pp. 1650042 ◽  
Author(s):  
Normakhmad Ravshanov ◽  
Nozim Kurbonov ◽  
Abduvali Mukhamadiev
Keyword(s):  
Differential Equation ◽  
Porous Media ◽  
Oil And Gas ◽  
Mathematical Problem ◽  
Heterogeneous Porous Media ◽  
Fluid Filtration ◽  
Operating Modes ◽  
Hydrogeological Parameters ◽  
Hydrogeological Characteristics ◽  
Production Wells

This paper deals with a mathematical problem statement of unsteady fluid flow in heterogeneous porous media with various hydrogeological characteristics. In order to solve the problem the authors developed an approximate analytical method. The method allows multidimensional differential equation in partial derivatives describing the process of fluid filtration in layered porous media to become one-dimensional differential equation. There was obtained a calculation formula for determining the process of mass transfer between the layers, depending on the operating modes of production wells and hydrogeological parameters of filtration layers. The model and the algorithm can be used as a mathematical support for the processes of development of oil and gas fields.

Experimental Study on Dry Finishing of Low-Speed WEDM

2014 ◽  
Vol 620 ◽  
pp. 73-82
Author(s):  
Tong Wang ◽  
Yu Mei Lu ◽  
Sun Fei Wang ◽  
Hong Shi Yin ◽  
Jun Ge
Keyword(s):  
Experimental Study ◽  
Design Method ◽  
Orthogonal Experimental Design ◽  
Pulse Interval ◽  
Optimum Level ◽  
Single Factor ◽  
Range Analysis ◽  
Five Factors ◽  
Finishing Process ◽  
Experimental Design Method

In order to further improve the surface quality in LS-WEDM, a new procedure as Gas-liquid Combined Multiple Cut (the finishing is in gas) is presented and has carried on the contrast experiment to conventional WEDM multi cutting processing in the paper. the single factor and orthogonal experimental design method were used to study Effects of pulse duration, pulse interval, peak current, servo voltage and servo feed on roughness in finishing in gas, By range analysis, analysis of variance and the binary table the optimum level of the above five factors was found in consideration of the above five factors interaction. The paper provides basis for advanced study of finishing process of LS-WEDM.

Optimizing on the Negative Electrode of Ni/MH Power Battery by Orthogonal Design

2009 ◽  
Vol 610-613 ◽  
pp. 480-487 ◽  
Author(s):  
Xiao Liang Zhong ◽  
Lei Zhu ◽  
Xu Yu Jian ◽  
Hai Jun Yu ◽  
Zhong Wang
Keyword(s):  
Electrochemical Impedance ◽  
Methyl Cellulose ◽  
Negative Electrode ◽  
High Rate ◽  
Styrene Butadiene Rubber ◽  
Orthogonal Experimental Design ◽  
Chemical Compositions ◽  
Butadiene Rubber ◽  
Range Analysis ◽  
Transfer Resistance

In this paper, the influences of different binders (Hydroxypropyl Methyl Cellulose (HPMC), Carboxymethyl Cellulose Sodium (CMC), Polytetrafluoroethylene (PTFE) and Styrene- butadiene Rubber (SBR)) on high-rate discharge performances at low temperature for the negative electrode of Ni/MH battery have been studied by orthogonal experimental design. Electrochemical measurements have been conducted to investigate the capacity, charge-discharge performance, cyclic voltammetry and electrochemical impedance characteristics. The surface morphology and chemical compositions have been investigated by SEM and EDS. Based on the range analysis, the primary and secondary influence factors as well as the optimization results were obtained. From the CV characteristic curves, the oxidization peaks and reduction peaks are not clearly shown, which indicates that the redox reaction does not occur clearly after binders added. The EIS experiments show that the deterioration of the voltage characteristic of the battery is due to drying out of the separator that increases the ohmic resistance (Rs ), and the decay of the discharge capacity is due to the passivity surface that increases the charge-transfer resistance (Rt) of the battery.

Estimation of effective hydrogeological parameters by considering varying heterogeneity and pumping rates

2012 ◽  
Vol 68 (1) ◽  
pp. 169-180 ◽  
Author(s):  
Shih-Ching Wu ◽  
Yih-Chi Tan ◽  
Chu-Hui Chen ◽  
Hsien-Tsung Lin
Keyword(s):  
Hydrogeological Parameters ◽  
Pumping Rates

Crashworthiness analysis and optimization of different configurations multi-layered corrugated sandwich panels under crush loading

2020 ◽  
pp. 109963622090975
Author(s):  
Chengfu Shu ◽  
Shujuan Hou ◽  
YX Zhang ◽  
Yutao Luo
Keyword(s):  
Experimental Design ◽  
Specific Energy ◽  
Sandwich Structure ◽  
Sandwich Panels ◽  
Functionally Graded ◽  
Orthogonal Experimental Design ◽  
Analysis Method ◽  
Range Analysis ◽  
Specific Energy Absorption ◽  
Graded Thickness

Multi-layered corrugated sandwich panels can be made up of different core shapes, different arrangements, the variable height, and variable thickness in every layer. In this paper, the crashworthiness behaviors of multi-layered corrugated sandwich panels with different configurations, which are controlled by these four factors, are analyzed and compared. The optimal configuration is found by adopting orthogonal experimental design and range analysis method. A novel multi-layered corrugated sandwich structure with functionally graded thickness is proposed and studied and is proved to better structural crashworthiness. First, finite element models of multi-layered corrugated sandwich panels are established and validated by experiment. Then, the effect of the four factors with three levels on crashworthiness is analyzed, and we obtain the main factor and the optimal configuration with the maximum specific energy absorption by using orthogonal experimental design and range analysis method. Finally, parametric studies and multi-objectives optimization of the proposed novel multi-layered corrugated sandwich structure with functionally graded thickness are conducted. The optimization is aimed at maximizing the specific energy absorption and minimizing the initial peak force under crush loading, based on the non-dominated sorting genetic algorithm and response surface method technique. These findings can provide valuable guidelines for the design of multi-layered corrugated sandwich panels with different configurations under crush loading.

Effect of Alkali Treatment on the Quality of Hemp Fiber

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900 ◽  
Author(s):  
Jie Zhang ◽  
Hua Zhang ◽  
Jianchun Zhang
Keyword(s):  
Chemical Composition ◽  
Experimental Design ◽  
Average Length ◽  
Alkali Treatment ◽  
Orthogonal Experimental Design ◽  
Average Weight ◽  
Range Analysis ◽  
Experimental Conditions ◽  
Hemp Fiber

An orthogonal experimental design was employed to study the effects of the bath ratio, time, and alkali dosage of alkali treatment on the chemical composition, fineness, average length, and staple rate of hemp fiber. Through normalization and average weight distribution of multiple indices, the quality of hemp fiber was quantified. Results of range analysis showed that the optimum quality of hemp fiber can be achieved under the following conditions: alkali treatment bath ratio, 1:10; time, 5 h; alkali dosage, 10 g/L; and length of hemp fiber, 16 mm to 29 mm. The reliability and repeatability of the best experimental conditions were further confirmed.

scholarly journals Multi-Objective Optimization Design and Test of Compound Diatomite and Basalt Fiber Asphalt Mixture

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1461 ◽  
Author(s):  
Yongchun Cheng ◽  
Liding Li ◽  
Peilei Zhou ◽  
Yuwei Zhang ◽  
Hanbing Liu
Keyword(s):  
Optimization Design ◽  
Orthogonal Experiment ◽  
Asphalt Mixture ◽  
Basalt Fiber ◽  
Asphalt Mixtures ◽  
Orthogonal Experimental Design ◽  
Basalt Fibers ◽  
Contributing Factors ◽  
Range Analysis ◽  
Four Levels

This study focuses on improving the performance of asphalt mixture at low- and high- temperature and analyzing the effect of diatomite and basalt fiber on the performance of the asphalt mixture. Based on the L16(45) orthogonal experimental design (OED), the content of diatomite (D) and basalt fiber (B) and the asphalt-aggregate (A) ratio were selected as contributing factors, and each contributing factor corresponded to four levels. Bulk volume density (γf), volume of air voids (VV), voids filled with asphalt (VFA), Marshall stability (MS) and splitting strength at −10 °C (Sb) were taken as the evaluation indexes. According to the results of the orthogonal experiment, the range analysis and variance analysis were used to study the effect of the diatomite content, basalt fiber content and asphalt-aggregate ratio on the performance of the asphalt mixture, and the grey correlation grade analysis (GCGA) was used to obtain the optimal mixing scheme. Furthermore, the performance tests were conducted to evaluate the performance improvement of asphalt mixtures with diatomite and basalt fibers, and the scanning electron microscopy (SEM) tests were carried out to analyze the mechanism of diatomite and basalt fibers in asphalt mixtures. The results revealed that the addition of diatomite and basalt fiber can significantly increase the VV of asphalt mixture, and reduce γf and VFA; the optimal performance of the asphalt mixture at high- and low-temperature are achieved with 14% diatomite, 0.32% basalt fibers and 5.45% asphalt-aggregate ratio. Moreover, the porous structure of diatomite and the overlapping network of basalt fibers are the main reasons for improving the performance of asphalt mixture.

Application of Orthogonal Experimental Design on Reliability and Sensitivity Analysis

2011 ◽  
Vol 211-212 ◽  
pp. 651-655 ◽  
Author(s):  
Qin Shu He ◽  
Xi Nen Liu ◽  
Shi Fu Xiao
Keyword(s):  
Sensitivity Analysis ◽  
Experimental Design ◽  
Structural Parameters ◽  
Orthogonal Experimental Design ◽  
Random Input ◽  
Range Analysis ◽  
First Order ◽  
Reliability Method ◽  
Structural Responses ◽  
Input Variables

In the present paper, the effects of four structural parameters at three levels on the reliability and sensitivity of structure are investigated. Sensitivity of parameters is achieved by the range analysis and the significance of parameters is achieved by the variance analysis. A response surface based on orthogonal experimental design and finite element calculations is elaborated so that the relation between the random input variables and structural responses could be established. The First-Order Reliability Method (FORM) as an approximated method is used here to assess the reliability. Comparing with the results of Monte Carlo simulations by ANSYS for a numerical example, the effect of sensitivity analysis has been proved, while the precision of the reliability and sensitivity should be improved in the future.

scholarly journals Modelling surface water-groundwater interactions at the Palas Basin (Turkey) using FREEWAT

2017 ◽  
Vol 6 (3) ◽  
Author(s):  
Filiz Dadaser-Celik ◽  
Mete Celik
Keyword(s):  
Surface Water ◽  
Groundwater Flow ◽  
Water Levels ◽  
Central Anatolia ◽  
Lake Ecosystem ◽  
Groundwater Pumping ◽  
Groundwater Abstraction ◽  
Groundwater Levels ◽  
Water Flows ◽  
Pumping Rates

Palas Basin is a semi-arid closed basin located in the Central Anatolia region of Turkey. The major economic activity in the basin is agriculture; therefore, both surface water and groundwater are used for irrigation. However, intensive use of water resources threatens the hydrologic sustainability of a lake ecosystem (Tuzla Lake) located in the basin. In this study, we analyzed the relationships between agricultural water uses in the Palas Basin and water flows to the Tuzla Lake using groundwater flow model developed with the FREEWAT platform. The model grid with 250 m x 250 m resolution was created based on the entire watershed. Two hydrostratigraphic units were identified. The source terms defined in the model were rainfall recharge and the sink terms were evapotranspiration and wells. The model was run for one year at steady state conditions. Three scenarios were simulated to understand the effect of groundwater use on the lake hydrology. The first scenario assumed that there was no groundwater abstraction. As the second and third water management scenario, the model was run with 50% less and %50 more groundwater abstraction than that of the reference conditions. The model successfully simulated the direction of groundwater flow and groundwater levels in the basin. Annual groundwater recharge was simulated as 5.27 million m3. Groundwater losses were due to pumping (1.49 million m3/yr), leakance to Değirmen River (2.25 million m3/yr) and seepage to Tuzla Lake (1.53 million m3/yr). Water flows to Tuzla Lake were significantly related to pumping rates. Increasing groundwater pumping rates reduces groundwater flows to Tuzla Lake and lowers lake water levels. No groundwater abstraction and reduction in groundwater pumping rates increase water flows to Tuzla Lake and cause higher water levels. This analysis showed that protection of hydrologic characteristics of Tuzla Lake is only possible with more control on groundwater abstraction.

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