The Impact Of New Light Rail Service On Employment Growth In Portland, Oregon,
2022
Portland State University
The Impact Of New Light Rail Service On Employment Growth In Portland, Oregon, Lahar Santra
Dissertations and Theses
This study quantitatively examines the impact of the new Light Rail Transit (LRT) service on employment growth in retail, knowledge, and service sectors before and after opening the LRT. At the corridor level, this study conducts a case study of Greenline in Southeast Portland, Oregon. The results of the corridor level study suggest that the new LRT service increased employment along the Greenline corridor among all the three sectors of interest- retail, knowledge, service in the long-term (ten years) while having slightly different results for the short-term (five years), likely due to the slow growth of LRT benefits. This study …
Collaborative Environmental Approach For Development Of The Lower Laguna Madre Estuary Program Strategic Plan In South Texas,
2022
The University of Texas Rio Grande Valley
Collaborative Environmental Approach For Development Of The Lower Laguna Madre Estuary Program Strategic Plan In South Texas, Javier Guerrero, Ahmed Mahmoud, Taufiqul Alam, Augusto Sanchez, Kim D. Jones, Andrew Ernest
Civil Engineering Faculty Publications and Presentations
The National Estuary Program (NEP) is a promising eco-system based approach to improve the water quality and ecological integrity of estuaries of national importance in the United States. Due to population growth and concomitant development pressure in South Texas, the future of the Lower Laguna Madre (LLM) without an estuary program is problematic. The development of a management plan for the LLM will enable the region to develop local solutions to local problems. The fundamental purpose of this research was to develop a strategic plan for the foundation of the Laguna Madre Estuary Program of the Gulf Coast of Texas. …
Molecular Insight Into The Fluidity Of Cement Pastes: Nano-Boundary Lubrication Of Cementitious Materials,
2022
Missouri University of Science and Technology
Molecular Insight Into The Fluidity Of Cement Pastes: Nano-Boundary Lubrication Of Cementitious Materials, Muhan Wang, Kaixuan Zhang, Xiang Ji, Pan Wang, Hongyan Ma, Jun Zhang, Dongshuai Hou
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
The workability mechanism of fresh concrete at the molecular level remains essentially unexplored. To understand the molecular origin for cement fluidity, molecular dynamics and Density Function Theory (DFT) were utilized to construct a shear model of Calcium-Silicate-Hydrate (C-S-H) layers. The structure, dynamics, and reactivity of ultra-confined pore solution between C-S-H gels are systematically investigated. Under shear loading, periodic oscillation of friction force is observed as the typically Couette flow and the interfacial friction force is reduced from 35.2 Kcal/mol·Å to 3.3 Kcal/mol·Å with water content increasing. All of the systems contain breakage of noncovalent bonds of water-Ca and water-water in …
Chromium-Resistant Staphylococcus Aureus Alleviates Chromium Toxicity By Developing Synergistic Relationships With Zinc Oxide Nanoparticles In Wheat,
2022
Government College University Faisalabad
Chromium-Resistant Staphylococcus Aureus Alleviates Chromium Toxicity By Developing Synergistic Relationships With Zinc Oxide Nanoparticles In Wheat, Shoaib Ahmad, Manar Fawzi Bani Mfarrej, Mohamed A. El-Esawi, Muhammad Waseem, Aishah Alatawi, Muhammad Nafees, Muhammad Hamzah Saleem, Muhammad Rizwan, Tahira Yasmeen, Alia Anayat, Shafaqat Ali
All Works
Chromium (Cr) is a toxic heavy metal that contaminates soil and water resources after its discharge from different industries. It can act as carcinogen and mutagen for biological systems. Microbe-assisted phytoremediation is one of the most emergent and environment friendly technique used for detoxification of Cr from Cr-contaminated soils. In this study, wheat as a test crop was grown under varying stress levels (0, 50, 100 and 200 mg/kg) of Cr in a pot experiment under a complete randomized design. Alleviative role of Staphylococcus aureus strain K1 was assessed by applying as a treatment in different combinations of zinc oxide …
Maize Response To Coupled Irrigation And Nitrogen Fertilization Under Center Pivot, Subsurface Drip And Surface (Furrow) Irrigation: Growth, Development And Productivity,
2022
Pennsylvania State University
Maize Response To Coupled Irrigation And Nitrogen Fertilization Under Center Pivot, Subsurface Drip And Surface (Furrow) Irrigation: Growth, Development And Productivity, Suat Irmak, Ali T. Mohammed, Meetpal S. Kukal
Biological Systems Engineering: Papers and Publications
Water availability and water quality problems negatively impact agricultural productivity due to improper nitrogen (N) and irrigation management, which can also negatively affect environmental services. Coupled irrigation and N management practices must be developed and practiced for alleviating these challenges. Investigating crop growth and development and yield response to coupled irrigation and N management under different irrigation methods can aid in developing optimum agronomic management practices to enhance crop production efficiency. Field experiments were conducted in 2016 and 2017 growing seasons to measure and compare maize (Zea mays L.) grain yield, leaf area index (LAI), plant height (and their …
Paper Mill Sludge Biochar To Enhance Energy Recovery From Pyrolysis: A Comprehensive Evaluation And Comparison,
2022
California State University, Bakersfield
Paper Mill Sludge Biochar To Enhance Energy Recovery From Pyrolysis: A Comprehensive Evaluation And Comparison, Zhongzhe Liu, Matthew Hughes, Yiran Tong, William Kreutter, Hugo Cortes Lopez, Simcha L. Singer, Daniel Zitomer, Patrick J. Mcnamara
Civil and Environmental Engineering Faculty Research and Publications
Bio-oil and pyrolysis gas (py-gas) are two pyrolysis products available for potential energy recovery. Crude bio-oil, however, is typically corrosive and unstable, requiring special combustion equipment or catalytic upgrading to produce drop-in-grade fuel. In contrast, py-gas is readily useable in standard equipment for energy recovery. Previous research revealed that Ca-impregnated biochar catalyst improved bio-oil to py-gas conversion. Biochar produced from paper mill sludge (p-sludge) has very high Ca content. In this study, the catalytic ability of p-sludge biochar was systematically evaluated for the first time in pyrolysis. P-sludge biochar resulted in higher py-gas yield (40 wt% of total pyrolysis products) …
Spatio-Temporal Variability Of Phosphorus Near The Groundwater-Stream Interface,
2022
The University of Western Ontario
Spatio-Temporal Variability Of Phosphorus Near The Groundwater-Stream Interface, Meghan Vissers
Electronic Thesis and Dissertation Repository
Agricultural practices can cause excess inputs of soluble reactive phosphorus (SRP) to freshwater catchments leading to eutrophication. This study evaluates spatio-temporal variability of SRP in an agricultural streambed including the influence of groundwater-stream interactions, and examines the associated geochemical and hydrological controls. High porewater SRP (>1000 µg/L) and high SRP sediment fractions were observed in low groundwater discharge zones, specifically in the shallow (≤ 0.1 m) streambed sediments. Porewater SRP concentrations were linked to iron redox cycling with SRP concentrations concordant with more reducing conditions. Porewater SRP varied temporally but distinct seasonal changes were not observed. The conditions in …
Applications Of Stretching Technique And Time Window Effects
On Ultrasonic Velocity Monitoring In Concrete,
2022
University of Nebraska - Lincoln
Applications Of Stretching Technique And Time Window Effects On Ultrasonic Velocity Monitoring In Concrete, Bibo Zhong, Jinying Zhu
Department of Civil and Environmental Engineering: Faculty Publications
Coda wave interferometry (CWI) has been used to measure the relative wave-velocity change (dV/V) caused by small changes in materials. This study uses the stretching processing technique which has been used for CWI analysis to investigate velocity changes of direct longitudinal (P) wave, direct shear (S) wave, and coda wave in concrete by choosing different time windows of ultrasonic signals. It is found that the obtained wave-velocity change depends on the time window position, because the relative contribution of P wave and S wave is different in each signal window. This paper presents three experimental scenarios of velocity …
Review On Applications Of Lignin In Pavement Engineering: A Recent Survey,
2022
Beijing University of Technology
Review On Applications Of Lignin In Pavement Engineering: A Recent Survey, Hui Yao, Yiran Wang, Junfu Liu, Mei Xu, Pengrui Ma, Jie Ji, Zhanping You
Michigan Tech Publications
Lignin is the second-largest plant polymer on Earth after cellulose. About 98% of lignin produced in the papermaking and pulping industry is used for combustion heating or power generation. Less than 2% of lignin is used in more valuable fields, mainly in the formulation of dispersants, adhesives, and surfactants. Asphalt is one of the most important materials in pavement engineering. It is a dark brown complex mixture composed of hydrocarbons with different molecular weights and their non-metallic derivatives. Because the chemical structure of lignin is similar to that of asphalt, it is a carbon-based hydrocarbon material. More researchers studied the …
Quality Management System Model,
2022
The American University in Cairo AUC
Quality Management System Model, Hisham Mohmmad Abu-Ghazala
Archived Theses and Dissertations
No abstract provided.
Ems Response Time Analyses For A Rural County Using Geographically Weighted Regression With Different Kernel Weighting Functions,
2022
University of Alabama in Huntsville
Ems Response Time Analyses For A Rural County Using Geographically Weighted Regression With Different Kernel Weighting Functions, Sneha R. Vanga, Phillip M. Ligrani, Mehrnaz Doustmohammadi, Michael Anderson
PRC-Affiliated Research
A Geographically Weighted Regression (GWR) is considered to compare results provided using two different kernel weighting functions: adaptive bi-square kernel and adaptive Gaussian kernel. To provide a baseline reference comparison, resulting data are also considered relative to Global Regression Analysis (GRA) calculations, which are obtained without the inclusion of geographical variability location data. For the analysis, data associated with a total of 214 crash cases for the dates between January 2016 and December 2019 are studied for a rural county in Alabama. Associated crash records are extracted from the Critical Analysis Reporting Environment (CARE) database. Six independent variables, including travel …
Electrical Resistivity Evolution Of Compacted Silty Clay Under Drying−Wetting Cycles Sequentially Coupled With Dynamic Loads,
2022
Key Laboratory of Road and Bridge Detection and Maintenance Technology of Zhejiang Province, Zhejiang Scientific Research Institute of Transport, Hangzhou, Zhejiang 310023, China
Electrical Resistivity Evolution Of Compacted Silty Clay Under Drying−Wetting Cycles Sequentially Coupled With Dynamic Loads, Zhi Hu, Pin-Bo Ai, Zhi-Chao Li, Qiang Ma, Li-Hua Li
Rock and Soil Mechanics
The performance evolution of subgrade soil under the coupling effect of drying?wetting cycle and dynamic load is essential for the safety and stability of the subgrade. In this study, a series of electrical resistivity tests was carried out on the compacted silty clay samples subjected to different drying?wetting cycles and dynamic loads using alternating current (AC) two-electrode method. The effect of drying?wetting cycles sequentially coupled with dynamic loads on the electrical resistivity of soil samples was investigated. Then, a mathematical relationship was established to quantitatively characterize the dynamic behaviors of soil samples based on electrical resistivity. Finally, the effectiveness of …
Pore Structure And Strength Deterioration Mechanism Of Phase Change
Energy Storage Backfill,
2022
School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Pore Structure And Strength Deterioration Mechanism Of Phase Change Energy Storage Backfill, Ai-Bing Jin, You Ju, Hao Sun, Yi-Qing Zhao, Hai Li, Zhou Zhang, Tong Lu
Rock and Soil Mechanics
In order to explore the pore structure characteristics of phase change energy storage backfill and their influence on the strength deterioration of backfill, a composite phase change material was prepared with butyl stearate as the phase change material and expanded perlite as the adsorption medium. Cement and tailings were mixed to prepare backfills with different additive amounts of the composite phase change material. The strength and structure characteristics of the phase change energy storage backfill with different addition amounts were obtained by using the methods of CT (computer tomography) scanning, MRI (magnetic resonance imaging) analysis, and uniaxial compression test, and …
Evolution Of Desiccation Cracking Behavior Of Clays Under Drying-Wetting Cycles,
2022
Nanjing University, China
Evolution Of Desiccation Cracking Behavior Of Clays Under Drying-Wetting Cycles, Jun-Dong Liu, Chao-Sheng Tang, Hao Zeng, Bin Shi
Rock and Soil Mechanics
Soils usually experience multiple drying-wetting cycles in nature, which can have a significant impact on the engineering properties of soils. Laboratory tests were conducted to investigate the effect of drying-wetting cycles on the initiation and evolution of cracks in clay layers. A clay specimen was prepared and was subsequently subjected to five drying-wetting cycles. The evolution of surface cracks during the drying-wetting cycles was monitored. The effect of drying-wetting cycles on the geometric characteristics of crack patterns was analyzed by the digital image processing software, and four geometric parameters, including the surface crack ratio, the total crack length, the average …
Numerical Analysis On Dynamic Response Characteristics Of Geosynthetic
Reinforced Embankment Under Moving Load,
2022
Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan University, Changsha, Hunan 410082, China
Numerical Analysis On Dynamic Response Characteristics Of Geosynthetic Reinforced Embankment Under Moving Load, Ling Zhang, Qiang Ou, Ming-Hua Zhao, Xuan-Ming Ding, Jian-Fei Liu
Rock and Soil Mechanics
The dynamic response of geosynthetic reinforced embankment under traffic moving load has attracted increasing attentions in the engineering field. A 3D model of geosynthetic reinforced embankment was established by using the ABAQUS finite element software in this paper, which was used to analyze the dynamic stress and deformation of geosynthetic reinforced embankment under moving load. The traffic load was simulated by two moving rectangular plane loads. Fortran subroutine was developed to control the amplitude, range, and speed of the moving load. The equivalent linear viscoelastic model was developed to simulate embankment fill to reflect the viscoelasticity of embankment fill. The …
Acoustic Emission Activity And Damage Evolution Characteristics Of Marble Under Triaxial Stress At High Temperatures,
2022
Structural Health Monitoring and Control Institute, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China
Acoustic Emission Activity And Damage Evolution Characteristics Of Marble Under Triaxial Stress At High Temperatures, Hao-Ran Li, Zi-Heng Wang, Shi-Rong Meng, Wei-Gang Zhao, Feng Chen
Rock and Soil Mechanics
In order to reveal the fracture development and damage evolution law of marble under the influence of temperature, the deformation and failure characteristics and acoustic emission activity of marble under the conditions of 30, 60, 90, 120 ℃ and 150 ℃ were studied by using triaxial servo testing machine and acoustic emission testing system. The results show that the triaxial compression failure of marble under high temperature goes through four stages: compaction and elastic deformation stage, plastic deformation stage, ductile failure stage and instability failure stage. The higher the test temperature is, the longer the compaction deformation stage and ductile …
Quantitative Characterization And Mesoscopic Study Of Propagation And
Evolution Of Three-Dimensional Rock Fractures Based On Ct,
2022
Key Laboratory of Mining and Safety Technology of Hebei Province, North China University of Science and Technology, Tangshan, Hebei 063210, China
Quantitative Characterization And Mesoscopic Study Of Propagation And Evolution Of Three-Dimensional Rock Fractures Based On Ct, Yan-Bo Zhang, Yue-Dong Xu, Xiang-Xin Liu, Xu-Long Yao, Shuai Wang, Peng Liang, Lin Sun, Bao-Zhu Tian
Rock and Soil Mechanics
No abstract provided.
Analysis Of Wave-Type And Seismic Component Induced By Rock Blasting
Considering Source Characteristics,
2022
School of Highway, Chang’an University, Xi’an, Shaanxi 710064, China
Analysis Of Wave-Type And Seismic Component Induced By Rock Blasting Considering Source Characteristics, Qi-Dong Gao, Wen-Bo Lu, Zhen-Dong Leng, Ya-Qiong Wang, Hai-Xiao Zhou, Shi-Chao Zhang
Rock and Soil Mechanics
The blasting induced seismic waves are generally composed of compressional wave (P-wave), shear wave (S-wave), and Rayleigh wave (R-wave), however, wave-type and seismic components are not differentiated in the attenuation law and safety criteria for the current blast vibration studies. In this study, a method of wave-type discrimination is used for the seismic wave prediction based on polarization direction. Using theoretical analysis and numerical modelling, the blasting source characteristics and the radiated wave-types are investigated for different shapes of explosive charge. Combined the results of the site blasting experiments, the wave-type and seismic components induced by three typical blast-holes are …
Analytical Solution Of The Long-Term Service Performance Of Tunnel Considering Surrounding Rock Rheology And Lining Deterioration Characteristics,
2022
Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Analytical Solution Of The Long-Term Service Performance Of Tunnel Considering Surrounding Rock Rheology And Lining Deterioration Characteristics, Chang Liu, Ding-Li Zhang, Su-Lei Zhang, Qian Fang, Huang-Cheng Fang
Rock and Soil Mechanics
Deterioration of lining is a common phenomenon in tunnel engineering that threatens the safety of operating tunnel. For tunnel lining deterioration in rheological rock mass, an analytical model is established which the rheology effect of surrounding rock and deterioration of lining are considered. The surrounding rock displacement and support pressure of tunnel during its service life are obtained. And then the correctness of analytical model is verified by numerical simulation. Subsequently, the sensitivity analyses of deterioration coefficient of lining, thickness of lining, support time, and rheological properties of surrounding rock are carried out by the proposed analytical model. Finally, the …
Instructional Design Framework For Construction Materials Training,
2022
Louisiana State Univ, Bert S Turner Dept Construct Management, Baton Rouge, LA 70803 USA
Instructional Design Framework For Construction Materials Training, Hazem Jadallah, Carol J. Friedland, Isabelina Nahmens, Charles Pecquet, Charles Berryman, Yimin Zhu
Faculty Publications
The construction industry is suffering, in part, from a lack of training programs offered to the construction workforce. Unfortunately, most construction training and education research focuses on university student education. Integrating education science theory into construction workforce training has the potential to improve industry training but there is a dearth of studies that present details of this integration process. To address this gap, a training framework was developed to educate material stakeholders on material properties, selection, and installation. This framework is based on andragogical and Universal Design for Learning (UDL) principles. An assessment method evaluates training agendas to improve upon …
