Civil and Environmental Engineering Commons^™

Visualizing The Fate And Distribution Of Pahs In Spartina And Avicennia Tissues From Barataria Basin, La, Kristina Jeannette Sebastian

LSU Master's Theses

During crude oil spill events, vegetation in marsh environments sequester polycyclic aromatic hydrocarbons (PAHs) from the crude oil by partitioning from the air phase through the waxy cuticle on the leaf surface. Recent studies from Macondo oil-impacted marshes have demonstrated that cycling of low molecular weight petrogenic PAHs occurs through the cuticle and other leaf tissue. At present, our understanding of how PAHs travel through the cuticle is coarse and limited by grab samples across the entire leaf, which preventing a full understanding the dynamics of PAH cycling in this environment. Multiphoton (MP) confocal microscopy visualizes the distribution of PAHs …

Water Quality Analysis Of Ecoroof Runoff In Portland, Pranoti P. Deshmukh

Civil and Environmental Engineering Master's Project Reports

Portland, Oregon is internationally recognized for its implementation of sustainable stormwater management technologies. Ecoroof is one of the sustainable solutions to reduce stormwater runoff which also provides multiple environmental benefits. However, very little is known about the impact of ecoroofs on water quality of roof runoff. Stormwater runoff carries a significant amount of pollutants, which, if it directly enters a stream or river, degrades water quality and severely harms aquatic life.

This study evaluates the trends in the long-term water quality data from ecoroofs and conventional roofs in the Portland area. Mann Kendall trend test was used to detect the …

Modeling Vertical Migration Of Cyanobacteria And Zooplankton, Corina Christina Mae Overman

Dissertations and Theses

Cyanobacteria, also known as blue-green algae, often cause harmful algal blooms and release toxic substances that can harm humans and other animals. Accurately modeling these phytoplankton is a step towards predicting, preventing, and controlling such blooms. Cyanobacteria and zooplankton species are known to migrate vertically in the water column on a daily cycle. Capturing this behavior is one aspect of correctly modeling their dynamics. Here, several models of cyanobacteria vertical movement were tested in proof-of-concept models before being applied to data from field studies. These models included both continuum and particle-tracking frameworks. Four continuum-framework models of cyanobacteria vertical migration were …

Evaluation Of The Uncertainty In Satellite-Based Crop State Variable Retrievals Due To Site And Growth Stage Specific Factors And Their Potential In Coupling With Crop Growth Models, Nathaniel Levitan, Yanghui Kang, Mutlu Özdogan, Vincenzo Magliulo, Paulo Castillo, Fred Moshary, Barry Gross

Publications and Research

Coupling crop growth models and remote sensing provides the potential to improve our understanding of the genotype x environment x management (G X E X M) variability of crop growth on a global scale. Unfortunately, the uncertainty in the relationship between the satellite measurements and the crop state variables across different sites and growth stages makes it diffcult to perform the coupling. In this study, we evaluate the effects of this uncertainty with MODIS data at the Mead, Nebraska Ameriflux sites (US-Ne1, US-Ne2, and US-Ne3) and accurate, collocated Hybrid-Maize (HM) simulations of leaf area index (LAI) and canopy light use …

Experimental Investigation Of The Effects Of Drilling Fluid Activity On The Hydration Behavior Of Shale Reservoirs In Northwestern Hunan, China, Han Cao, Zheng Zhang, Ting Bao, Pinghe Sun, Tianyi Wang, Qiang Gao

Michigan Tech Publications, Part 1

The interaction between drilling fluid and shale has a significant impact on wellbore stability during shale oil and gas drilling operations. This paper investigates the effects of the drilling fluid activity on the surface and osmotic hydration characteristics of shale. Experiments were conducted to measure the influence of drilling fluid activity on surface wettability by monitoring the evolution of fluid-shale contact angles. The relationship between drilling fluid activity and shale swelling ratio was determined to investigate the osmotic hydration behavior. The results indicate that, with increasing drilling fluid activity, the fluid–shale contact angles gradually increase—the higher the activity, the faster …

Stability Of Slopes Of Embankments Of Railway Access Road To Jsc "Shargunkumir", U.E. Ergashev, N.I. Begmatov, F.F. Eshonov

Journal of Tashkent Institute of Railway Engineers

The article deals with the stability of the embankment slope. The scheme for the calculation and the results of the calculation of the stability of the embankment slope are presented. Based on the calculation results, transverse embankment profiles with a height of more than 12 m are designed and recommended for use

Technology Of Strengthening Of Embankment Of Railways Of Sandy Soils With Application Of Geosynthetic Materials, K.S. Lesov

Journal of Tashkent Institute of Railway Engineers

This article reduced the technology of strengthening the embankment of the railway roadbed from sandy soils with the use of geosynthetic materials. Constructive and technological solutions execution of work are given

Some Aspects Of Evaluating Economic Efficiency During Thermal Renewal Of External Walls Of Civil Buildings, S.S. Shaumarov, S.I. Kandakhorov

Journal of Tashkent Institute of Railway Engineers

This article presents the results of calculations to determine the payback period for the installation of additional insulation of the outer walls of civil buildings, taking into account the increase in tariffs for thermal energy. From a practical point of view, this calculation allows us to evaluate the economic efficiency of the thermal renewal of the outer walls of civil buildings

To The Question Of Producing Efficient Construction Materials Based On Waste Of Agricultural Crops, Anvar Ishanovich Adilkhodjayev, I.M. Mahamataliev, A.T. Ilyasov

Journal of Tashkent Institute of Railway Engineers

One of the promising areas of agricultural waste use is its use as raw material for the pro-duction of efficient building materials for energy-saving technologies, which is especially im-portant for areas that have a waste of agriculture and are in short supply in easily accessible building materials. On the other hand, an important task of technical policy is now to increase the use of lightweight structures in order to reduce the mass of erected structures, reduce the cost of transport costs and the cost of installing structures. In this regard, the use of dry cotton stems (guzapai) in a specially …

Method Of Activation Of Cement Mixture Components By Ultrasonic Field, U.A. Yokubov, O.V. Trunilina, V.N. Avdievich, S.Z. Mirzaev, S.E. Kurbanbaev

Journal of Tashkent Institute of Railway Engineers

The theoretical and experimental methods of increasing the efficiency of cement disperse systems by the action of a low-energy ultrasonic field are given in the article, as well as a technique providing highly efficient treatment of mixing water with a minimum energy expenditure

Mathematical Models Of Magnetic Chains Of Electron Electromagnetic Modifiers With Fluid Meter Measuring Fluid Surface, S.F. Amirov, A.O. Ataullaev, S.H. Jumabaev

Journal of Tashkent Institute of Railway Engineers

Mathematical models of magnetic circuits of electromagnetic flow transducers with an annular channel have been developed, taking into account the distribution of the parameters of the magnetic circuit and leakage fluxes closed through non-working air gaps. The possibility of compensating for the difference in magnetic resistance of coaxially arranged concentric ferromagnetic cores due to the difference in their circumference by selecting the thickness of the cores is shown.

Technique For Determining The Capacity Of A Container Terminal Equipped By Rubber Tyred Gantry, Sh.R. Abduvahitov

Journal of Tashkent Institute of Railway Engineers

This article presents the advantages and disadvantages, as well as the technical characteristics of the rubber tyred gantry. He conducted a brief scientific analysis in the field of research of technical equipment of container terminals. A mathematical model of the parameters of relations of the crane, container and cargo terminal is proposed.

The Study Of Magnetic Circuits With Distributed Magnetizing Windings, S.F. Amirov, K.K. Jurayeva, O.T. Boltayev

Journal of Tashkent Institute of Railway Engineers

By research of magnetic chains of new magnetoelastic sensors of efforts with the distributed magnetizing windings by method of drawing up the equivalent circuit it is shown that at rather large number of the cascade connected sites of a magnetic chain and accounting of distribution of the magnetizing forces of sections of a winding of excitement decrease in an error of calculation of magnetic chains with the distributed parameters is reached essential (to 23%). It is established that magnetic tension along a magnetic chain is distributed not linearly and changes the sign in a point of a magnetic neutral, and …

Rationing Of Departure Time Of Freight Cars From Stations And Optimization Of Delivery Periods, J.R. Qobulov, J.S. Barotov

Journal of Tashkent Institute of Railway Engineers

In this article to connect the wagons loaded to the trains shortening the staying time in process of their collection and recycling delivers freight wagons accelerates the selection and use of shunting equipment, sends wagons to the station at the right time. Is listed below in railway transport on delivery freight wagons, international and local wagons staying time the main quality indicators in station. As well as developed scheme of the algorithm for the timing of staying in the wagons at the station.

Developing Of Microelectronic Block Нсс, A.R. Аzizov, E.K. Аmetova

Journal of Tashkent Institute of Railway Engineers

The issue of developing a microelectronic control block of paired arrows the HCC is discussed in the article. The analysis of the block circuit concept is carried out and it is determined which elements are to be replaced and on which microelectronic devices. Electric circuits are considered that provide automatic recruitment of a train route that contains four circuits. The analysis of the block operation in the circuit of push-button relays, which receive power from the block НСС, was carried out, the calculation of the assumed current strength showed the need to use an optical-relay type Pvg-612 in this circuit.

Solving The Problem Of Capacity Of Single-Track Railway Section T-A Located Along The Line Of The Transport Corridor “China-Kyrgyzstan-Uzbekistan”, S.K. Hudajberganov, G.Sh. Ikramov, Sh.Sh. Kajumov

Journal of Tashkent Institute of Railway Engineers

The main problem of single track railway lines is that the existing capacity does not satisfy the need, resulting in the need to apply a number of measures. This is exactly the problem that exists in the considered junction T-A, which in the future will be a link in the “China-Kyrgyzstan-Uzbekistan” transport corridor. The article provides possible solutions to this problem. The adoption of the optimal solution in the future will solve not only the problem of through put, but also help to improve the qualitative and quantitative indicators of this site.

Development Of Classification Of The Reasons Of Losses In The Work Sorting Stations, Sh.M. Suyunbayev, D.B. Butunov

Journal of Tashkent Institute of Railway Engineers

In this article to connect the wagons loaded to the trains shortening the staying time in process of their collection and recycling delivers freight wagons accelerates the selection and use of shunting equipment, sends wagons to the station at the right time. Is listed below in railway transport on delivery freight wagons, international and local wagons staying time the main quality indicators in station. As well as developed scheme of the algorithm for the timing of staying in the wagons at the station.

Analysis Of Video Monitoring Of Results Of Labor Activities Of Train Dispatcher (As A Traffic Dispatcher Of The Single Dispatch Center Of The Joint-Stock Company "Uzbekistan Temir Yollari".), S. Sulaymanov, Kh.M. Kamilov

Journal of Tashkent Institute of Railway Engineers

The article presents the results of processing and analysis of video data of the timing of the work shift of train dispatchers of the Single Dispatch Center of JSC "Uzbekistan Temir Yollari". A diagram of the distribution of work shift time in three characteristic poses is constructed. Train dispatchers 57% of the shift time when doing work are in a sitting pose, 21% in a sitting-standing pose, 9% are in a standing pose and 13% for other work on demand. Based on the results of the video timing, taking into account the anthropometric parameters of a person, the dimensions of …

About Organization Of Mobile Communications In Long Car Tunnels, A.S. Shamsiev, A.Sh. Shakhobiddinov

Journal of Tashkent Institute of Railway Engineers

The high demand for mobile services observed in recent years poses a challenge for telecom operators to expand service areas not only in populated areas, but also in places with a specific architecture and terrain. These places include car tunnels. In this article, the authors discuss some issues of mobile communications in long car tunnels. The requirements for the characteristics of a mobile communication channel and some expressions for calculating signal levels inside rectangular tunnels are considered.

Analysis Of Methods For Determining The Resistance Of Differential Scattering Of Synchronous Machines, Taking Into Account The Saturation Of The Magnetic Circuit, А.K. Halbutaeva

Journal of Tashkent Institute of Railway Engineers

The article presents the results of the analysis of published scientific papers, in which one or another method of calculating the resistance of differential scattering of synchronous machines, taking into account the non-linearity of saturation of the magnetic core, is adopted. It is noted that most of these works are performed using the superposition method, intended only for linear systems.

Analysis Of Characteristics Of Parabolic And Parabolocylindrical Hubs, Comparison Of Data Obtained On Them, J.R. Kodirov, S.Sh. Khakimova, Sh.M. Mirzaev

Journal of Tashkent Institute of Railway Engineers

Solar energy technologies can be quickly deployed and have the potential for a global transfer of technology and innovation. In order to manufacture parabolic and parabolic cylindrical concentrators, an analytical review of these two types of solar devices was carried out and, after their creation, experiments were conducted on them in the season of maximum solar radiation. The article also presents data and their comparison for planning subsequent actions of research activities.

Features Of Functioning Container Terminal In Supply Chains, D.I. Ilesaliev, Sh.R. Abduvahitov

Journal of Tashkent Institute of Railway Engineers

The purpose of this article is to study the container terminal as a technical system. In this regard, in this article it is necessary to investigate the functioning of the container terminal, associated with the random nature of the incoming and outgoing containers from the terminal. An example of a method for determining the number of reach players is also given.

Analysis Of Work Of Passenger Trains On Two-Zone Sections And Automation Of Alerts Issued To Them, H.S. Toxirov, A.M. Bashirova

Journal of Tashkent Institute of Railway Engineers

“Uzbekistontimir yollari” JSC makes a great contribution to ensuring the safety of passenger transportation. Passenger traffic is constantly growing and growth is expected in the future, and competition is growing in the suburban passenger transport market. Increasing the size of passenger trains requires even more attention to safety. The article discusses the possibility of organizing a zonal movement on a suburban section X-T and to facilitate the work of the duty officers at the automation station issuing warnings for trains.

Principles And Features Of Blockchain Technology Implementation In The Railway Industry, L.F. Kazanskaya, N.A. Drivolskaya

Journal of Tashkent Institute of Railway Engineers

Objective: to Consider the advantages and disadvantages of using blockchain technology and the possibility of introducing cryptocurrencies in the transport sphere of Russia. Methods: methods of generalization, grouping, comparative analysis, system approach, problem statement, study of literary sources and normative-legislative documents, results of activity, study and generalization of experience were Used. Results: blockchain technology applied to cryptocurrencies is Considered. The principle of operation of the blockchain technology in the transaction of bitcoins between users in relation to the railway industry. The conclusion is made about the problems of introduction of cryptocurrencies as payment instruments in the near future due to …

Peculiarities Of Corporate Governance On Railway Transport Of The Republic Of Uzbekistan, M.G. Grigoryan, F.Z. Karakulov

Journal of Tashkent Institute of Railway Engineers

Peculiarities and problems of the development of corporate governance of the railway company of «Uzbekistan Temir Yo’llari» JSC in the current economic conditions are considered. The relevance of the chosen direction of research is determined by its high significance for the economic, political and geopolitical development of the railway transport of the Republic of Uzbekistan. Political and geopolitical interest is associated with a significant impact on the national economy, which is provided by the railway transport companies of the Republic of Uzbekistan, as well as with the desire for the interaction of other enterprises in order to obtain additional competitive …

Rheological Properties Of Modified Crumb Rubber Asphalt Binder And Selecting The Best Modified Binder Using Ahp Method, Mehdi Khalili, Kazem Jadidi, Serji Amirkhanian

Civil and Environmental Engineering and Construction Faculty Research

Crumb rubber modifier (CRM) is one of the most popular asphalt binder modifiers due to the economic benefits and desired physical and rheological properties of asphalt binders and asphalt mixes. This research focuses on evaluating the properties of rubber-modified asphalt binders and selecting the best modified binder. The modified binders were produced by blending virgin binders with CRM at various contents of different gradations, and different methods of grinding. CRM made through ambient and cryogenic grinding methods with two gradation sizes were produced and tested. Three different virgin binders from two sources were obtained and used. The Analytic Hierarchy Process …

Role Of Submicrometer Particles In Advanced Technologies Of Carbon Capture, Zhichao Li

McKelvey School of Engineering Graduate Student Theses & Dissertations

Oxy-combustion and post-combustion carbon capture technologies are two of the most promising strategies for carbon capture and storage (CCS), which is a commonly accepted approach to address the challenge of climate change. Pressurized oxy-combustion has been actively studied due to its great potential to enhance the power plant energy efficiency by recovering latent heat from water vapor condensation without incurring additional gas compression cost. On the other hand, amine-based CO2 scrubbers have been demonstrated to have high removal efficiency of CO2 with the possibility to recycle amine solutions, which makes the technology a promising candidate for post-combustion carbon capture. Nonetheless, …

Role Of Submicrometer Particles In Advanced Technologies Of Carbon Capture, Zhichao Li

McKelvey School of Engineering Graduate Student Theses & Dissertations

Oxy-combustion and post-combustion carbon capture technologies are two of the most promising strategies for carbon capture and storage (CCS), which is a commonly accepted approach to address the challenge of climate change. Pressurized oxy-combustion has been actively studied due to its great potential to enhance the power plant energy efficiency by recovering latent heat from water vapor condensation without incurring additional gas compression cost. On the other hand, amine-based CO2 scrubbers have been demonstrated to have high removal efficiency of CO2 with the possibility to recycle amine solutions, which makes the technology a promising candidate for post-combustion carbon capture. Nonetheless, …

Evaluation Of Low And High Frequency Dynamic Response For Condition Assessment Of Reinforced Concrete Structures, Ali Hafiz

Dissertations and Theses

Concrete is widely used for civil infrastructure structures and they experience deterioration and degradation due to aging, increases in the traffic loads, harsher environmental conditions, use of deicing chemicals, etc. Therefore, evaluating the integrity of reinforced concrete structures has become of increasing interest for infrastructure owners and managers. A number of non-destructive testing (NDT) and structural health monitoring (SHM) methods have been developed in recent decades to aid in evaluating structures and provide input for asset management. One family of these methods uses the dynamic response of a structural member: stress waves (high frequency) and structural vibrations (low frequency). Both …

Generalized Beam–Spring Model For Predicting Elastic Behavior Of Partially Composite Concrete Sandwich Wall Panels, Salam Al-Rubaye, Taylor Sorensen, Robert J. Thomas, Marc Maguire

Faculty Publications

Partially composite sandwich wall panels (SWP) have been used in the construction industry for at least twenty years. Currently there is limited codified guidance for designers of partially composite concrete SWP, but they are being designed safely and routinely. Design is often guided by the composite connector manufacturers who sell proprietary composite connectors often using a variation of truss-type matrix methods for prediction of elastic behavior of SWPs. The purpose of this paper is to quantify the accuracy of such a model in a uniform manner by developing a generalized version of these matrix models called the beam-spring model (BSM). …