Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- AMSR2 (1)
- ASCAT (1)
- AWRA-L (1)
- Agricultural drought (1)
- Bayesian frameworks (1)
-
- Civil Engineering (1)
- Crash severity (1)
- Days of the week (1)
- Dirichlet process prior (1)
- Disparity effect (1)
- Dye adsoption (1)
- Dye-sensitized solar cell (1)
- Dynamic transition of traffic regimes (1)
- ERA-Interim (1)
- Environmental evolution (1)
- Gaussian distributed random-effect (1)
- Governance measures (1)
- Hierarchical model (1)
- Lane lateral locations (1)
- Non-parametric distributed random-effect (1)
- Paleoclimate (1)
- Photoanode (1)
- Rb/Sr ratio (1)
- Soil moisture (1)
- Stochastic optimization; In situ chemical oxidation; Risk assessment; DNAPL source remediation; Uncertainty analysis (1)
- Surrounding residents (1)
- TiO2 nanomaterial (1)
- Travel time reliability (1)
- Water ecological restoration (1)
- Water pollution (1)
- Publication Type
Articles 1 - 10 of 10
Full-Text Articles in Engineering
Study On Dye-Sensitized Solar Cells Based On Tio2 Composite Nanomaterials, Cuiping Kang, Muhammad Aqeel Ashraf, Yung-Tse Hung
Study On Dye-Sensitized Solar Cells Based On Tio2 Composite Nanomaterials, Cuiping Kang, Muhammad Aqeel Ashraf, Yung-Tse Hung
Civil and Environmental Engineering Faculty Publications
With the continuous development of nanomaterials, how to improve the conversion efficiency of DSSCs has been the focus of scholars. Nano-TiO2 material is a wide bandgap semiconductor with a bandgap of 3.2eV. It exhibits good performance in dye adsorption, charge separation, electron transport, etc., and has good chemical stability and strong acid and alkali resistance. Therefore, it was always the material of choice for the preparation of photoanodes. In this paper, different thicknesses of TiO2 NRs barrier layers were prepared on FTO substrates by solvothermal method and two-step spin coating method, and their electrochemical and photoelectric properties were tested by …
An Application Of Bayesian Multilevel Model To Evaluate Variations In Stochastic And Dynamic Transition Of Traffic Conditions, Emmanuel Kidando, Ren Moses, Thobias Sando, Eren Erman Ozguven
An Application Of Bayesian Multilevel Model To Evaluate Variations In Stochastic And Dynamic Transition Of Traffic Conditions, Emmanuel Kidando, Ren Moses, Thobias Sando, Eren Erman Ozguven
Civil and Environmental Engineering Faculty Publications
© 2019, The Author(s). This study seeks to investigate the variations associated with lane lateral locations and days of the week in the stochastic and dynamic transition of traffic regimes (DTTR). In the proposed analysis, hierarchical regression models fitted using Bayesian frameworks were used to calibrate the transition probabilities that describe the DTTR. Datasets of two sites on a freeway facility located in Jacksonville, Florida, were selected for the analysis. The traffic speed thresholds to define traffic regimes were estimated using the Gaussian mixture model (GMM). The GMM revealed that two and three regimes were adequate mixture components for estimating …
Advances In Remote Sensing To Understand Extreme Hydrological Events, Dongkyun Kim, Minha Choi, Jongho Kim, Ungtae Kim
Advances In Remote Sensing To Understand Extreme Hydrological Events, Dongkyun Kim, Minha Choi, Jongho Kim, Ungtae Kim
Civil and Environmental Engineering Faculty Publications
No abstract provided.
Incorporating Travel Time Reliability In Predicting The Likelihood Of Severe Crashes On Arterial Highways Using Non-Parametric Random-Effect Regression, Emmanuel Kidando, Ren Moses, Eren Erman Ozguven, Thobias Sando
Incorporating Travel Time Reliability In Predicting The Likelihood Of Severe Crashes On Arterial Highways Using Non-Parametric Random-Effect Regression, Emmanuel Kidando, Ren Moses, Eren Erman Ozguven, Thobias Sando
Civil and Environmental Engineering Faculty Publications
© 2019 The Authors Travel time reliability (TTR) modeling has gain attention among researchers' due to its ability to represent road user satisfaction as well as providing a predictability of a trip travel time. Despite this significant effort, its impact on the severity of a crash is not well explored. This study analyzes the effect of TTR and other variables on the probability of the crash severity occurring on arterial roads. To address the unobserved heterogeneity problem, two random-effect regressions were applied; the Dirichlet random-effect (DRE) and the traditional random-effect (TRE) logistic regression. The difference between the two models is …
Agricultural Drought Assessment Based On Multiple Soil Moisture Products, Jongjin Baik, Muhammad Zohaib, Ungtae Kim, Muhammad Aadil, Minha Choi
Agricultural Drought Assessment Based On Multiple Soil Moisture Products, Jongjin Baik, Muhammad Zohaib, Ungtae Kim, Muhammad Aadil, Minha Choi
Civil and Environmental Engineering Faculty Publications
In this study, we evaluated three soil moisture (SM) products (Advanced Microwave Scanning Radiometer-2 [AMSR2], Advanced SCATterometer [ASCAT], and European Reanalysis Interim [ERA-interim]) across Australia in four climate zones by comparing against the Australian Water Resources Assessment-Landscape (AWRA-L) SM products from July 2012 to June 2017. The ASCAT SM indicated better performance than other SM products over Australia. To evaluate the applicability and reliability for monitoring agricultural drought, an agricultural drought index, the Soil Water Deficit Index, was estimated from three SM products and compared with three commonly-used drought indices (atmospheric water deficit [AWD], Evaporative Stress Index, and Reconnaissance …
Congestion Mitigation Strategy: Modeling The Effect Of Different Geometric Configurations Of A Two-Lane On-Ramp On Capacity Using Vissim, Rhizlane Brachmi
Congestion Mitigation Strategy: Modeling The Effect Of Different Geometric Configurations Of A Two-Lane On-Ramp On Capacity Using Vissim, Rhizlane Brachmi
ETD Archive
Freeway on-ramps are critical components of freeway systems since they control the entry of traffic to the mainline. According to the Highway Capacity Manual (HCM), a two-lane on-ramp configuration will achieve less turbulence than a similar one-lane on-ramp but little guidance on the desired lengths of the acceleration lanes or their effect on the operation of the influence area is provided. An experiment was designed to investigate the effect of the lengths of the acceleration lanes of isolated, two-lane on-ramps on the operation of the ramp influence area. The Highway Capacity Software (HCS) was used to calculate the density of …
Water Pollution In Old Towns Affecting The Environment And Ecological Restoration, Zou Hang, Muhammad Aqeel Ashraf, Yung Tse Hung
Water Pollution In Old Towns Affecting The Environment And Ecological Restoration, Zou Hang, Muhammad Aqeel Ashraf, Yung Tse Hung
Civil and Environmental Engineering Faculty Publications
© 2019 Technoscience Publications. All rights reserved. In order to solve the problem that the traditional activated sludge method is not effective in recovering the ecological process of water pollution in urban areas, the membrane bioreactor-based sewage treatment process was studied experimentally. Two flat-plate ultrafiltration membranes were used to form the ultrafilter tank in the experimental device sampled, and the processes of nitrate cycle and sludge cycle were adopted. Ozonation and granular activated carbon filtration were adopted to treat the micropollutants. After repeated experiments in 17 experimental cycles, the obtained experimental data were analysed, and it was found that under …
Impact Of Sea Surface Temperature And Surface Air Temperature On Maximizing Typhoon Rainfall: Focusing On Typhoon Maemi In Korea, Jeonghyeon Choi, Jeonghoon Lee, Sangdan Kim
Impact Of Sea Surface Temperature And Surface Air Temperature On Maximizing Typhoon Rainfall: Focusing On Typhoon Maemi In Korea, Jeonghyeon Choi, Jeonghoon Lee, Sangdan Kim
Civil and Environmental Engineering Faculty Publications
In this study, the effects of surface air temperature (SAT) and sea surface temperature (SST) changes on typhoon rainfall maximization are analysed. Based on the numerically reproduced Typhoon Maemi, this study tried to maximize the typhoon-induced rainfall by increasing the amount of saturated water vapour in the atmosphere and the amount of water vapour entering the typhoon. Using the Weather Research and Forecasting (WRF) model, which is one of the regional climate models (RCMs), the rainfall simulated by WRF while increasing the SAT and SST to various sizes at initial conditions and boundary conditions of the model was analysed. As …
Application Of Rb/Sr Ratio In Paleo-Climate Inversion, Shupei Ouyang, Muhammad Aqeel Ashraf, Yung-Tse Hung
Application Of Rb/Sr Ratio In Paleo-Climate Inversion, Shupei Ouyang, Muhammad Aqeel Ashraf, Yung-Tse Hung
Civil and Environmental Engineering Faculty Publications
In order to study the intensity of chemical weathering during the formation of sedimentary strata in the site profile, the evolution of climatic environment in the region where the site profile is located was revealed. The rubidium (Rb) and strontium (Sr) values in the rubidium (Rb) and strontium (Sr) were tested and analysed. The Rb/Sr ratio has become an ideal alternative indicator in the study of regional environmental evolution. The Rb value in the strata section of Zhongba site is low, and the average value (calculated based on 202 sample values) is only 80 g/g. The Sr value was higher, …
Stochastic Cost-Optimization And Risk Assessment Of In Situ Chemical Oxidation For Dense Non-Aqueous Phase Liquid (Dnapl) Source Remediation, Ungtae Kim, Jack C. Parker, Robert C. Borden
Stochastic Cost-Optimization And Risk Assessment Of In Situ Chemical Oxidation For Dense Non-Aqueous Phase Liquid (Dnapl) Source Remediation, Ungtae Kim, Jack C. Parker, Robert C. Borden
Civil and Environmental Engineering Faculty Publications
This study involved development of a computer program to determine optimal design variables for in situ chemical oxidation (ISCO) of dense nonaqueous phase liquid (DNAPL) sites to meet site-wide remediation objectives with minimum life-cycle remediation cost while taking uncertainty in site characterization data and model predictions into consideration. A physically-based ISCO performance model computes field-scale DNAPL dissolution, instantaneous reaction of oxidant with contaminant and with readily oxidizable natural oxidant demand (NOD), second-order kinetic reactions for slowly oxidizable NOD, and time to reach ISCO termination criteria. Remediation cost is computed by coupling the performance model with a cost module. ISCO termination …