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Extending Performance and Evaluating Risks of PV Systems Failure Using a Fault Tree and Event Tree Approach: Analysis of the Possible Application
Performance and reliability of photovoltaic (PV) systems are important issues in the overall evaluation of a PV plant and its components. While performance is connected to the amount of energy produced by the PV installation in the working environmental conditions, reliability impacts the availability of the system to produce the expected amount of energy. In both cases, the evaluation should be done considering information and data coming from indoor as well as outdoor tests. In this paper a way of re-thinking performance, giving it a probabilistic connotation, and connecting the two concepts of performance and reliability is proposed. The paper follows a theoretical approach and discusses the way to obtaining such information, facing benefits and problems. The proposed probabilistic performance accounts for the probability of the system to function correctly, thus passing through the complementary evaluation of the probability of system malfunctions and consequences. Scenarios have to be identified where the system is not functioning properly or at all. They are expected to be combined in a probabilistic safety analysis (PSA) based approach, providing not only the required probability, but also being capable of giving a prioritization of the risks and the most dominant scenario associated to a specific situation. …
Date:
June 3, 2012
Creator:
A., Colli
Object Type:
Article
System:
The UNT Digital Library
Limits on the Production of the Standard Model Higgs Boson in $Pp$ Collisions at $\sqrt{s}=7$ TeV with the ATLAS Detector
None
Date:
June 3, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Measurement of the $\upsilon_{1S}$ Production Cross-Section in $Pp$ Collisions at $\sqrt{s} = 7 TeV in ATLAS
None
Date:
June 3, 2013
Creator:
Aad, Georges
Object Type:
Article
System:
The UNT Digital Library
Elicitation of question words and interrogative sentences
Recording of an elicitation of interrogative sentences in Mankiyali. Several sentences were elicited in which various question words were gathered. The contributor is Aurangzeb, a 34-year old male teacher.
Date:
October 3, 2019
Creator:
Accord, Levi
Object Type:
Sound
System:
The UNT Digital Library
Hydrogen Safety Training for Researchers
None
Date:
August 3, 2010
Creator:
Aceves, S.; Petitpas, G.; Ross, T. & Switzer, V.
Object Type:
Report
System:
The UNT Digital Library
Comments Regarding "Study of Molecular Interactions in Binary Mixtures of Formamide with 2-Methoxyethanol and 2-Ethoxyethanol at Varying Temperatures"
This article provides comments on "Study of Molecular Interactions in Binary Mixtures of Formamide with 2-Methoxyethanol and 2-Ethoxyethanol at Varying Temperatures," published in 'Physics and Chemistry of Liquids,' 2013.
Date:
June 3, 2013
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
DEMONSTRATION OF MIXING AND TRANSFERRING SETTLING COHESIVE SLURRY SIMULANTS IN THE AY-102 TANK
In support of Hanford's feed delivery of high level waste (HLW) to the Waste Treatment and Immobilization Plant (WTP), pilot-scale testing and demonstrations with simulants containing cohesive particles were performed as a joint collaboration between Savannah River National Laboratory (SRNL) and the Pacific Northwest National Laboratory (PNNL) staff. The objective of the demonstrations was to determine the impact that cohesive particle interactions in the simulants, and the resulting non-Newtonian rheology, have on tank mixing and batch transfer of large and dense seed particles. The work addressed the impacts cohesive simulants have on mixing and batch transfer performance in a pilot-scale system. Kaolin slurries with a range of wt% concentrations to vary the Bingham yield stress were used in all the non-Newtonian simulants. To study the effects of just increasing the liquid viscosity (no yield stress) on mixing and batch transfers, a glycerol/water mixture was used. Stainless steel 100 micron particles were used as seed particles due to their density and their contrasting color to the kaolin and glycerol. In support of Hanford's waste certification and delivery of tank waste to the Waste Treatment and Immobilization Plant (WTP), Savannah River National Laboratory (SRNL) was tasked by Washington River Protection Solutions (WRPS) …
Date:
January 3, 2012
Creator:
Adamson, D. & Gauglitz, P.
Object Type:
Article
System:
The UNT Digital Library
Lebanon: Background and U.S. Relations
This report provides an overview of Lebanese politics, recent events in Lebanon, and current issues in U.S.-Lebanon relations.
Date:
August 3, 2010
Creator:
Addis, Casey L.
Object Type:
Report
System:
The UNT Digital Library
Hezbollah: Background and Issues for Congress
Report that discusses Lebanon's Hezbollah, a Shiite Islamist militia, political party, social welfare organization, and U. S. State Department-designated terrorist organization. The report also discusses recent Hezbollah-related conflicts, Hezbollah's relationship with other Lebanese political parties, and U. S. policy regarding Hezbollah.
Date:
January 3, 2011
Creator:
Addis, Casey L. & Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
The Middle East: Selected Key Issues and Options for the 112th Congress
This report provides an overview of key issues, relating to the Middle East including the war in Afghanistan, terrorism, foreign assistance, democracy promotion, a summary of past congressional action on these issues, and options for congressional consideration during the 112th Congress.
Date:
January 3, 2011
Creator:
Addis, Casey L.; Blanchard, Christopher M.; Katzman, Kenneth; Sharp, Jeremy M. & Zanotti, Jim
Object Type:
Report
System:
The UNT Digital Library
ILC RF System R and D
The Linac Group at SLAC is actively pursuing a broad range of R&D to improve the reliability and reduce the cost of the L-band (1.3 GHz) rf system proposed for the ILC linacs. Current activities include the long-term evaluation of a 120 kV Marx Modulator driving a 10 MW Multi-Beam Klystron, design of a second-generation Marx Modulator, testing of a sheet-beam gun and beam transport system for a klystron, construction of an rf distribution system with remotely-adjustable power tapoffs, and development of a system to combine the power from many klystrons in low-loss circular waveguide where it would be tapped-off periodically to power groups of cavities. This paper surveys progress during the past few years.
Date:
July 3, 2012
Creator:
Adolphsen, Chris
Object Type:
Article
System:
The UNT Digital Library
Europe's Preferential Trade Agreements: Status, Content, and Implications
This report explores intersecting issues regarding Europe's preferential trade agreements (PTA) in three parts. The first section discusses the status and primary motivations of the EU's PTAs currently in place or under negotiation. The second compares the content and trade coverage of Europe's PTAs to U.S. PTAs. A third section assesses the implications of the EU's PTA program for the multilateral trading system and U.S. trade policy. A concluding section evaluates future directions for Europe's PTA policy.
Date:
March 3, 2011
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
Test Cell C Shielding Study Kiwi B4D-202
None
Date:
July 3, 2013
Creator:
Ahlquist, A. John & Dummer, Jerome E
Object Type:
Report
System:
The UNT Digital Library
Prototyping Energy Efficient Thermo-Magnetic & Induction Hardening for Heat Treat & Net Shape Forming Applications
Within this project, Eaton undertook the task of bringing about significant impact with respect to sustainability. One of the major goals for the Department of Energy is to achieve energy savings with a corresponding reduction in carbon foot print. The use of a coupled induction heat treatment with high magnetic field heat treatment makes possible not only improved performance alloys, but with faster processing times and lower processing energy, as well. With this technology, substitution of lower cost alloys for more exotic alloys became a possibility; microstructure could be tailored for improved magnetic properties or wear resistance or mechanical performance, as needed. A prototype commercial unit has been developed to conduct processing of materials. Testing of this equipment has been conducted and results demonstrate the feasibility for industrial commercialization.
Date:
August 3, 2012
Creator:
Ahmad, Aquil
Object Type:
Report
System:
The UNT Digital Library
Enhanced Hydrogen Dipole Physisorption, Final Report
The hydrogen gas adsorption effort at Caltech was designed to probe and apply our understanding of known interactions between molecular hydrogen and adsorbent surfaces as part of a materials development effort to enable room temperature storage of hydrogen at nominal pressure. The work we have performed over the past five years has been tailored to address the outstanding issues associated with weak hydrogen sorbent interactions in order to find an adequate solution for storage tank technology.
Date:
January 3, 2014
Creator:
Ahn, Channing
Object Type:
Report
System:
The UNT Digital Library
Export-Import Bank: Overview and Reauthorization Issues
This report provides: (1) a general background of Ex-Im Bank; (2) a discussion of the international context of the Bank; (3) analysis of key issues that Congress may consider in a reauthorization debate; and (4) the congressional outlook on Ex-Im Bank.
Date:
June 3, 2014
Creator:
Akhtar, Shayerah Ilias
Object Type:
Report
System:
The UNT Digital Library
The First 10 Years of NeuroIS: A Systematic Literature Review of NeuroIS Publications (2007 – 2017)
This paper contains a systematic literature review of the NeuroIS academic research publications of the last 10 years (2007-2017).
Date:
January 3, 2018
Creator:
Al Mamun, Md Rasel; David, Alsius; Mai, Bin; Kim, Dan J. & Parsons, Thomas D.
Object Type:
Paper
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 32, No. 40, Ed. 1 Sunday, November 3, 2013
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
November 3, 2013
Creator:
Aldaz, Gina
Object Type:
Newspaper
System:
The Portal to Texas History
The Colony Courier-Leader (The Colony, Tex.), Vol. 33, No. 26, Ed. 1 Sunday, August 3, 2014
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
August 3, 2014
Creator:
Aldaz, Gina
Object Type:
Newspaper
System:
The Portal to Texas History
DEVELOPMENT OF AN APPROACH TO MODELING LOADING AND ELUTION OF SPHERICAL RESORCINOL FORMALDEHYDE ION-EXCHANGE RESIN
The current strategy for removal of cesium from the Hanford waste stream is ion-exchange using spherical Resorcinol-Formaldehyde (sRF) resin. The original resin of choice was granular SuperLig 644 resin and during testing of this resin several operational issues were identified. For example, the granular material had a high angle of internal friction resulting in fragmentation of resin particles along its edges during cycling and adverse hydraulic performance. Efforts to replace SuperLig 644 were undertaken and one candidate was the granular Resorcinol-Formaldehyde (RF) resin where experience with this cation exchanger dates back to the late 1940's. To minimize hydraulic concerns a spherical version of RF was developed and several different chemically produced batches were created. The 5E-370/641 batch of sRF was selected and for the last decade numerous studies have been performed (e.g., batch contact tests, column loading and elution tests). The Waste Treatment Plant (WTP) flowsheet shows that the aqueous phase waste stream will have a wide range of ionic concentrations (e.g., during the loading step 0-3 M free OH, 5+ M Na, 0-1 M K, 0-3 M NO{sub 3}). Several steps are required in the ion-exchange process to achieve the required Cs separation factors: loading, displacement, washing, elution, and …
Date:
October 3, 2011
Creator:
Aleman, S.; Hamm, L. & Smith, F.
Object Type:
Report
System:
The UNT Digital Library
Sociodemographic characteristics and sexual behavior as risk factors for human papillomavirus infection in Saudi Arabia
This article seeks to determine the prevalence and the sociodemographic characteristics and sexual behavior risk factors for human papillomavirus (HPV) infection in a hospital-based cohort of women in Saudi Arabia.
Date:
April 3, 2016
Creator:
Alhamlan, F. S.; Khayat, H. H.; Ramisetty-Mikler, Suhasini; Al-Muammar, T. A.; Tulbah, A. M.; Al-Badawi, I. A. et al.
Object Type:
Article
System:
The UNT Digital Library
Genetic Engineering Workshop Report, 2010
The Lawrence Livermore National Laboratory (LLNL) Bioinformatics group has recently taken on a role in DTRA's Transformation Medical Technologies (TMT) program. The high-level goal of TMT is to accelerate the development of broad-spectrum countermeasures. To achieve this goal, there is a need to assess the genetic engineering (GE) approaches, potential application as well as detection and mitigation strategies. LLNL was tasked to coordinate a workshop to determine the scope of investments that DTRA should make to stay current with the rapid advances in genetic engineering technologies, so that accidental or malicious uses of GE technologies could be adequately detected and characterized. Attachment A is an earlier report produced by LLNL for TMT that provides some relevant background on Genetic Engineering detection. A workshop was held on September 23-24, 2010 in Springfield, Virginia. It was attended by a total of 55 people (see Attachment B). Twenty four (44%) of the attendees were academic researchers involved in GE or bioinformatics technology, 6 (11%) were from DTRA or the TMT program management, 7 (13%) were current TMT performers (including Jonathan Allen and Tom Slezak of LLNL who hosted the workshop), 11 (20%) were from other Federal agencies, and 7 (13%) were from industries …
Date:
November 3, 2010
Creator:
Allen, J. & Slezak, T.
Object Type:
Report
System:
The UNT Digital Library
Collaboratory for Multiscale Chemical Science (CMCS)
This document provides details of the contributions made by NIST to the Collaboratory for Multiscale Chemical Science (CMCS) project. In particular, efforts related to the provision of data (and software in support of that data) relevant to the combustion pilot project are described.
Date:
July 3, 2012
Creator:
Allison, Thomas C.
Object Type:
Report
System:
The UNT Digital Library
Using a Partial Sum Method and GPS Tracking Data to Identify Area Restricted Search by Artisanal Fishers at Moored Fish Aggregating Devices in the Commonwealth of Dominica
This article reports on research to identify area-restricted search foraging behavior at fish aggregating device (FAD) patches.
Date:
February 3, 2015
Creator:
Alvard, Michael; Carlson, David & McGaffey, Ethan
Object Type:
Article
System:
The UNT Digital Library