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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

New Transmission Planning Methodology For Requesting Proposals For Wind Generation

Isaacs, Andrew 10 September 2010 (has links)
One technique used to control the influx of renewable generation while maintaining competitive principles is a Request for Proposals (RFP). However, lack of transmission planning due to a disconnection between generation and transmission owners, difficulty in identifying viable projects, and high risk for proponents stand as obstacles to the goals of an RFP. This research proposes a procedure which minimizes the effect of these obstacles; meeting the purchaser requirements for low price and combining conventional planning concepts with feedback from competitive structures. The general features of the method include definition of generation limits and study area, expansion plan design, transmission cost evaluation, optimal selection of requested generation levels, and final selection of successful proponents. A case study using a real system in New Mexico demonstrates these concepts.
2

New Transmission Planning Methodology For Requesting Proposals For Wind Generation

Isaacs, Andrew 10 September 2010 (has links)
One technique used to control the influx of renewable generation while maintaining competitive principles is a Request for Proposals (RFP). However, lack of transmission planning due to a disconnection between generation and transmission owners, difficulty in identifying viable projects, and high risk for proponents stand as obstacles to the goals of an RFP. This research proposes a procedure which minimizes the effect of these obstacles; meeting the purchaser requirements for low price and combining conventional planning concepts with feedback from competitive structures. The general features of the method include definition of generation limits and study area, expansion plan design, transmission cost evaluation, optimal selection of requested generation levels, and final selection of successful proponents. A case study using a real system in New Mexico demonstrates these concepts.
3

Monitoring the Expression of rrn Operons by Novel Gfp Reporter System in Model Drinking Water

Chen, Yanping 27 September 2005 (has links)
No description available.
4

From Protein Sequence to Motion to Function: Towards the Rational Design of Functional Protein Dynamics

Damry, Adam 16 May 2019 (has links)
Protein dynamics are critical to the structure and function of proteins. However, due to the complexity they inherently bring to the protein design problem, dynamics historically have not been considered in computational protein design (CPD). Herein, we present meta-MSD, a new CPD methodology for the design of protein dynamics. We applied our methodology to the design of a novel mode of conformational exchange in Streptococcal protein G domain B1, producing dynamic variants we termed DANCERs. Predictions were validated by NMR characterization of selected DANCERs, confirming that our meta-MSD framework is suitable for the computational design of protein dynamics. We then performed a thorough NMR characterization of the sequence determinants of dynamics in one DANCER, isolating two mutations responsible for the novel dynamics this protein exhibits. The first, A34F, is responsible for destabilizing the highly stable native Gβ1 conformation, allowing the protein to sample other conformational states. The second, V39L mediates subtle interactions that stabilize the designed conformational trajectory in the context of the A34F mutation. Together, these results highlight the role of protein plasticity in the development of dynamics and the need for highly accurate computational tools to approach similar design problems. Finally, we present an NMR-based characterization of structural dynamics in a family of related red fluorescent proteins (RFPs) and pinpoint regions of the RFP structure where dynamics correlate to RFP brightness. This overview of the RFP dynamics-function relationship will be used in future projects to perform a computation design of functional dynamics in RFPs.
5

Experimental studies of materials migration in magnetic confinement fusion devices : Novel methods for measurement of macro particle migration, transport of atomic impurities and characterization of exposed surfaces

Bykov, Igor January 2014 (has links)
During several decades of research and development in the field of Magnetically Confined Fusion (MCF) the preferred selection of materials for Plasma Facing Components (PFC) has changed repeatedly. Without doubt, endurance of the first wall will decide research availability and lifespan of the first International Thermonuclear Research Reactor (ITER). Materials erosion, redeposition and mixing in the reactor are the critical processes responsible for modification of materials properties under plasma impact. This thesis presents several diagnostic techniques and their applications for studies of materials transport in fusion devices. The measurements were made at the EXTRAP T2R Reversed Field Pinch operated in Alfvén laboratory at KTH (Sweden), the TEXTOR tokamak, recently shut down at Forschungszentrum Jülich (Germany) and in the JET tokamak at CCFE (UK). The main outcomes of the work are: Development and application of a method for non-destructive capture and characterization of fast dust particles moving in the edge plasma of fusion devices, as well as particles generated upon laser-assisted cleaning of plasma exposed surfaces.  Advancement of conventional broad beam and micro ion beam techniques to include measurement of tritium in the surfaces exposed in future D-T experiments.  Adaption of the micro ion beam method for precision mapping of non uniform elements concentrations on irregular surfaces.  Implementation of an isotopic marker to study the large scale materials migration in a tokamak and development of a method for fast non destructive sampling of the marker on surfaces of PFCs. / <p>QC 20140508</p>
6

AN EXPLORATION OF ORGANIZATIONAL BUYING BEHAVIOR IN THE PUBLIC SECTOR

Chase, Kevin S. 01 January 2018 (has links)
This dissertation begins with a comprehensive examination of the current state of research regarding organizational buying behavior. Through this review we identify a significant gap in our existing knowledge regarding organizational buying behavior in the public sector. Due to the high level of impact that government purchasing has on the economy, and the nuances that differentiate public from private sector purchasing practices, I further explore organizational buying behavior in the public sector to make the following contributions. First, I highlight the common practice in business-to-government (B2G) and business-to-business (B2B) transactions where buyers limit suppliers’ access to them during the buying process. This research terms these buyers “barricaded buyers.” Despite their prominence in practice, research related to barricaded buyers remains virtually non-existent. Therefore, the present research draws on insights gleaned from eight case studies over a period of approximately eighteen months to shed light on this important topic. Second, this dissertation advances a conceptual framework highlighting competitive actions a focal supplier can take to improve its selection likelihood when selling to barricaded buyers. The framework identifies novel ways suppliers can gain advantage by reducing competitive intensity in the pre-barricade phase (e.g., by peacocking) and by enhancing their RFP response quality in the post-barricade phase (e.g., by offering consummate solutions). Importantly, the framework invokes the notion of strategic information disclosure whereby a focal supplier may gain advantage by knowing when to convey what types of information in barricaded buying environments.
7

Numerical studies of current profile control in the reversed-field pinch

Dahlin, Jon-Erik January 2006 (has links)
The Reversed-Field Pinch (RFP) is one of the major alternatives for realizing energy production from thermonuclear fusion. Compared to alternative configurations (such as the tokamak and the stellarator) it has some advantages that suggest that an RFP reactor may be more economic. However, the conventional RFP is flawed with anomalously large energy and particle transport (which leads to unacceptably low energy confinement) due to a phenomenon called the "RFP dynam". The dynamo is driven by the gradient in the plasma current in the plasma core, and it has been shown that flattening of the plasma current profile quenches the dynamo and increases confinement. Various forms of current profile control schemes have been developed and tested in both numerical simulations and experiments. In this thesis an automatic current profile control routine has been developed for the three-dimensional, non-linear resistive magnetohydrodynamic computer code DEBSP. The routine utilizes active feedback of the dynamo associated fluctuating electric field, and is optimized for replacing it with an externally supplied field while maintaining field reversal. By introducing a semi-automatic feedback scheme, the number of free parameters is reduced, making a parameter scan feasible. A scaling study was performed and scaling laws for the confinement of the advanced RFP (an RFP with enhanced confinement due to current profile control) have been obtained. The conclusions from this research project are that energy confinement is enhanced substantially in the advanced RFP and that poloidal beta values are possible beyond the previous theoretical limit beta βΘ &lt; ½. Scalings toward the reactor regime indicate strongly enhanced confinement as compared to conventional RFP scenarios, but the question of reactor viability remains open. / QC 20101101
8

Numerical studies of current profile control in the reversed-field pinch

Dahlin, Jon-Erik January 2006 (has links)
<p>The Reversed-Field Pinch (RFP) is one of the major alternatives for realizing energy production from thermonuclear fusion. Compared to alternative configurations (such as the tokamak and the stellarator) it has some advantages that suggest that an RFP reactor may be more economic. However, the conventional RFP is flawed with anomalously large energy and particle transport (which leads to unacceptably low energy confinement) due to a phenomenon called the "RFP dynam".</p><p>The dynamo is driven by the gradient in the plasma current in the plasma core, and it has been shown that flattening of the plasma current profile quenches the dynamo and increases confinement. Various forms of current profile control schemes have been developed and tested in both numerical simulations and experiments.</p><p>In this thesis an automatic current profile control routine has been developed for the three-dimensional, non-linear resistive magnetohydrodynamic computer code DEBSP. The routine utilizes active feedback of the dynamo associated fluctuating electric field, and is optimized for replacing it with an externally supplied field while maintaining field reversal. By introducing a semi-automatic feedback scheme, the number of free parameters is reduced, making a parameter scan feasible. A scaling study was performed and scaling laws for the confinement of the advanced RFP (an RFP with enhanced confinement due to current profile control) have been obtained.</p><p>The conclusions from this research project are that energy confinement is enhanced substantially in the advanced RFP and that poloidal beta values are possible beyond the previous theoretical limit beta β<sub>Θ</sub> < ½. Scalings toward the reactor regime indicate strongly enhanced confinement as compared to conventional RFP scenarios, but the question of reactor viability remains open.</p>
9

Size of FRP laminates to strengthen reinforced concrete sections in flexure

Ashour, Ashraf F. January 2002 (has links)
This paper presents an analytical method for estimating the flexural strength of reinforced concrete (RC) beams strengthened with externally bonded fibre-reinforced polymer (FRP) laminates. The method is developed from the strain compatibility and equilibrium of forces. Based on the size of external FRP laminates, several flexural failure modes may be identified, namely tensile rupture of FRP laminates and concrete crushing before or after yielding of internal steel reinforcement. Upper and lower limits to the size of FRP laminates used are suggested to maintain ductile behaviour of strengthened RC sections. Comparisons between the flexural strength obtained from the current method and from experiments show good agreement. Design equations for calculating the size of FRP laminates externally bonded to RC sections to enhance their flexural strength are proposed.
10

Room Function Program and Technical Description : Interaction with BIM Models

Fard, Ali Ataei January 2016 (has links)
The move from two dimensional drawings (2D) to three dimensional (3D) models is underway in the architectural, engineering and construction industry. The three dimensional models may also be full of information which more exactly defines the different elements of a building, such models are called Building Information Modelling (BIM). Normally within a construction project, Computer-Aided Design (CAD) tools, experts add information to models and the feedback from the rest of the stakeholders are done during common meetings. The important part of information management of construction projects is the briefing process, collecting and defining the client's requirements throughout the construction project. The thesis project aims at defining and developing such tools which communicates with BIM models. Specifically, the main focus of this thesis is on creating interactive tools for Room Function Program (RFP) and Technical Description. An RFP describes the content and functionality of one or several rooms of a building that is designed at the early stage of a building construction. A Technical Description defines and describes all specifications of products which should be in a building. Current available and commonly used processes and products for RFP will be examined within this thesis as the industry has room for improvements with these particular concepts. The thesis project is conducted through research, case studies and interviews, respectively. First, the research and case studies analyzed the use and benefits of BIM. Then, the interview examined the gap between BIM, RFP and Technical Description and it is included in Appendix A. Subsequently, the RFP and Technical Description tools will be integrated with the BIM viewer successfully and desired visual feedback is given by filtering and highlighting the object in the model.

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