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433 Matching Results
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N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops
We present the full two-loop four-graviton amplitudes in N = 4, 5, 6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N = 0, 1, 2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have the expected infrared behavior: the two-loop divergences are given in terms of the squares of the corresponding one-loop amplitudes. The finite remainders are presented in a compact form. The finite remainder for N = 8 supergravity is also presented, in a form that utilizes a pure function with a very simple symbol.
Date:
February 15, 2012
Creator:
Boucher-Veronneau, C. & Dixon, L. J.
Object Type:
Article
System:
The UNT Digital Library
20% Wind by 2030: Overcoming the Challenges in West Virginia
Final Report for '20% Wind by 2030: Overcoming the Challenges in West Virginia'. The objective of this project was to examine the obstacles and constraints to the development of wind energy in West Virginia as well as the obstacles and constraints to the achievement of the national goal of 20% wind by 2030. For the portion contracted with WVU, there were four tasks in this examination of obstacles and constraints. Task 1 involved the establishment of a Wind Resource Council. Task 2 involved conducting limited research activities. These activities involved an ongoing review of wind energy documents including documents regarding the potential for wind farms being located on reclaimed surface mining sites as well as other brownfield sites. The Principal Investigator also examined the results of the Marshall University SODAR assessment of the potential for placing wind farms on reclaimed surface mining sites. Task 3 involved the conducting of outreach activities. These activities involved working with the members of the Wind Resource Council, the staff of the Regional Wind Energy Institute, and the staff of Penn Future. This task also involved the examination of the importance of transmission for wind energy development. The Principal Investigator kept informed as to transmission …
Date:
February 15, 2012
Creator:
Mann, Patrick & Risch, Christine
Object Type:
Report
System:
The UNT Digital Library
85th Texas Legislature, Regular Session, Senate Concurrent Resolution 15
Concurrent resolution introduced by the Texas House of Representatives and Senate granting the legislature permission to adjourn for more than three days during the period beginning on Wednesday, February 8, 2017, and ending on Monday, February 13, 2017.
Date:
February 15, 2017
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
Accountability for U.S. Equipment Provided to Pakistani Security Forces in the Western Frontier Needs to Be Improved
Correspondence issued by the Government Accountability Office with an abstract that begins "Al Qaeda, the Taliban, and other extremists have used safe havens along Pakistan's Western Frontier (border) region to attack Pakistani, Afghan, U.S., and coalition troops; plan and train for attacks against U.S. interests and the U.S. homeland; destabilize Pakistan, a nuclear-armed U.S. ally; and spread radical Islamic ideologies that threaten U.S. interests. A key U.S. national security objective is to disrupt, dismantle, and defeat al Qaeda and its violent extremist affiliates in Pakistan and to deny them a safe haven. Since 2002, the United States has provided over $18 billion in assistance and reimbursement to Pakistan including (1) reimbursements to the Pakistani government for costs incurred in direct support of U.S. counterterrorism operations; (2) security assistance such as grants to Pakistan for the acquisition of military equipment; and (3) development, economic, and humanitarian assistance. Since 2006, this assistance has included $1.5 billion to improve the counterterrorism and counterinsurgency capabilities of Pakistani security forces operating along the country's border with Afghanistan, including $400 million for the Pakistan Counterinsurgency Fund (PCF) and $700 million for the Pakistan Counterinsurgency Capabilities Fund (PCCF). The President has requested an additional $1.2 billion for …
Date:
February 15, 2011
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Addressing Control of Hazardous Energy (COHE) Requirements in a Laser Safety Program
OSHA regulation 29CFR1910.147 specifies control of hazardous energy requirements for 'the servicing and maintenance of machines and equipment in which the unexpected energization or start up of the machines or equipment, or release of stored energy could cause injury to employees.' Class 3B and Class 4 laser beams must be considered hazardous energy sources because of the potential for serious eye injury; careful consideration is therefore needed to safely de-energize these lasers. This paper discusses and evaluates control of hazardous energy principles in this OSHA regulation, in ANSI Z136.1 ''Safe Use of Lasers,'' and in ANSI Z244.1 ''Control of Hazardous Energy, Lockout/Tagout and Alternative Methods.'' Recommendations are made for updating and improving CoHE (control of hazardous energy) requirements in these standards for their applicability to safe laser operations.
Date:
February 15, 2012
Creator:
Woods, Michael
Object Type:
Article
System:
The UNT Digital Library
AdS/QCD and Light Front Holography: A New Approximation to QCD
The combination of Anti-de Sitter space (AdS) methods with light-front holography leads to a semi-classical first approximation to the spectrum and wavefunctions of meson and baryon light-quark bound states. Starting from the bound-state Hamiltonian equation of motion in QCD, we derive relativistic light-front wave equations in terms of an invariant impact variable {zeta} which measures the separation of the quark and gluonic constituents within the hadron at equal light-front time. These equations of motion in physical space-time are equivalent to the equations of motion which describe the propagation of spin-J modes in anti-de Sitter (AdS) space. Its eigenvalues give the hadronic spectrum, and its eigenmodes represent the probability distribution of the hadronic constituents at a given scale. Applications to the light meson and baryon spectra are presented. The predicted meson spectrum has a string-theory Regge form M{sup 2} = 4{kappa}{sup 2}(n+L+S/2); i.e., the square of the eigenmass is linear in both L and n, where n counts the number of nodes of the wavefunction in the radial variable {zeta}. The space-like pion form factor is also well reproduced. One thus obtains a remarkable connection between the description of hadronic modes in AdS space and the Hamiltonian formulation of QCD in …
Date:
February 15, 2010
Creator:
Brodsky, Stanley J. & de Teramond, Guy
Object Type:
Article
System:
The UNT Digital Library
Air Conditioning with Magnetic Refrigeration
Advanced Research Projects Agency-Energy project sheet summarizing general information about the Building Energy Efficiency Through Innovative Thermodevices (BEETIT) program including critical needs, innovation and advantages, impacts, and contact information. This sheet discusses air conditioning with magnetic refrigeration as part of "An Efficient, Green Compact Cooling System Using Magnetic Refrigeration" project.
Date:
February 15, 2012
Creator:
Astronautics Corporation of America
Object Type:
Text
System:
The UNT Digital Library
All-Optical Time-Resolved Measurement of Laser Energy Modulation in a Relativistic Electron Beam
Hamiltonian light-front theory has been proposed as a promising method for solving bound states problems in quantum field theory a long time ago, see, e.g., the review article[1] for its various advantages compared to the traditional instant-form theories. Recently the Basis Light-Front Quantization (BLFQ) approach [2, 3] has been developed as a nonperturbative approach to solve Hamiltonian light-front quantum field theory. Numerical efficiency is a key advantage of this approach. The basic idea of BLFQ is to represent the theory in an optimal basis which respects many symmetries of the theory and thus minimizes the dimensionality of the Hamiltonian for a fixed precision. Specifically, the BLFQ approach employs a plane wave basis in the light-front longitudinal direction and a 2D harmonic oscillator basis in the transverse directions. In previous work [3] this approach has been applied to evaluate the anomalous magnetic moment of electrons which are confined in an external trap with an extrapolation to the zero trap limit. In this work we extend and improve this approach in several aspects including the direct evaluation of a free electron system. This article is organized as follows: In Sec. 2 we discuss the key extensions and improvements made in this work …
Date:
February 15, 2012
Creator:
Xiang, D.; Colby, E.; Dunning, M.; Gilevich, S.; Hast, C.; Jobe, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Alpha Channeling in Rotating Plasma with Stationary Waves
An extension of the alpha channeling effect to supersonically rotating mirrors shows that the rotation itself can be driven using alpha particle energy. Alpha channeling uses radiofrequency waves to remove alpha particles collisionlessly at low energy. We show that stationary magnetic fields with high nθ can be used for this purpose, and simulations show that a large fraction of the alpha energy can be converted to rotation energy.
Date:
February 15, 2010
Creator:
Fetterman, A. & Fisch, N. J.
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 221, Ed. 1 Wednesday, February 15, 2012
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2012
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 260, Ed. 1 Thursday, February 15, 2018
Triweekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2018
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 112, No. 311, Ed. 1 Tuesday, February 15, 2011
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2011
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 113, No. 185, Ed. 1 Friday, February 15, 2013
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2013
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 115, No. 202, Ed. 1 Sunday, February 15, 2015
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2015
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Altus Times (Altus, Okla.), Vol. 118, No. 33, Ed. 1 Wednesday, February 15, 2017
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 15, 2017
Creator:
Steinkopff, Eric
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, February 15, 2017
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 2017
Creator:
Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
The Alvin Sun (Alvin, Tex.), Vol. 126, No. 14, Ed. 1 Monday, February 15, 2016
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 2016
Creator:
Moore, Dan & Money, David
Object Type:
Newspaper
System:
The Portal to Texas History
Analytic Result for the Two-loop Six-point NMHV Amplitude in N = 4 Super Yang-Mills Theory
We provide a simple analytic formula for the two-loop six-point ratio function of planar N = 4 super Yang-Mills theory. This result extends the analytic knowledge of multi-loop six-point amplitudes beyond those with maximal helicity violation. We make a natural ansatz for the symbols of the relevant functions appearing in the two-loop amplitude, and impose various consistency conditions, including symmetry, the absence of spurious poles, the correct collinear behavior, and agreement with the operator product expansion for light-like (super) Wilson loops. This information reduces the ansatz to a small number of relatively simple functions. In order to fix these parameters uniquely, we utilize an explicit representation of the amplitude in terms of loop integrals that can be evaluated analytically in various kinematic limits. The final compact analytic result is expressed in terms of classical polylogarithms, whose arguments are rational functions of the dual conformal cross-ratios, plus precisely two functions that are not of this type. One of the functions, the loop integral {Omega}{sup (2)}, also plays a key role in a new representation of the remainder function R{sub 6}{sup (2)} in the maximally helicity violating sector. Another interesting feature at two loops is the appearance of a new (parity odd) …
Date:
February 15, 2012
Creator:
Dixon, Lance J.; Drummond, James M. & Henn, Johannes M.
Object Type:
Article
System:
The UNT Digital Library
Angle-resolved photoemission study of the evolution of band structure and charge density wave properties in RTe3 (R= Y, La, Ce, Sm, Gd, Tb and Dy)
We present a detailed ARPES investigation of the RTe{sub 3} family, which sets this system as an ideal 'textbook' example for the formation of a nesting driven Charge Density Wave (CDW). This family indeed exhibits the full range of phenomena that can be associated to CDW instabilities, from the opening of large gaps on the best nested parts of Fermi Surface (FS) (up to 0.4eV), to the existence of residual metallic pockets. ARPES is the best suited technique to characterize these features, thanks to its unique ability to resolve the electronic structure in k-space. An additional advantage of RTe{sub 3} is that the band structure can be very accurately described by a simple 2D tight-binding (TB) model, which allows one to understand and easily reproduce many characteristics of the CDW. In this paper, we first establish the main features of the electronic structure, by comparing our ARPES measurements with Linear Muffin-Tin Orbital band calculations. We use this to define the validity and limits of the TB model. We then present a complete description of the CDW properties and, for the first time, of their strong evolution as a function of R. Using simple models, we are able to reproduce perfectly …
Date:
February 15, 2010
Creator:
Brouet, V.; Yang, W. L.; Zhou, X. J.; Hussain, Z.; Moore, R. G.; He, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Antioxidants L-carnitine and D-methionine modulate neuronal activity through GABAergic inhibition
Article on antioxidants L-carnitine and D-methionine modulate neuronal activity through GABAergic inhibition.
Date:
February 15, 2014
Creator:
Wu, Calvin; Gopal, Kamakshi V.; Moore, Ernest J. & Gross, Guenter W.
Object Type:
Article
System:
The UNT Digital Library
The Aransas Pass Progress (Aransas Pass, Tex.), Vol. 108, No. 7, Ed. 1 Wednesday, February 15, 2017
Weekly newspaper from Aransas Pass, Texas that includes local, state, and national news along with advertising.
Date:
February 15, 2017
Creator:
Bowers, John
Object Type:
Newspaper
System:
The Portal to Texas History
Bahrain: Reform, Security, and U.S. Policy
This report discusses Bahrain's political and governmental structure, economy, regional policies, defense agreements with the U.S., and human rights concerns. The 2011 uprising against the royal family and its aftermath are also discussed.
Date:
February 15, 2018
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
[Banner at 2013 Emancipation Proclamation event]
A photograph of a long banner hanging from the second floor in an open area in the center of the UNT Student Union. It has rows of figures from the chest up with dates and information inside of them and they are colored black, yellow, red, and green. At the top it reads "Emancipation Proclamation 150th".
Date:
February 15, 2013
Creator:
University of North Texas. Multicultural Center.
Object Type:
Photograph
System:
The UNT Digital Library
The Bastrop Advertiser (Bastrop, Tex.), Vol. 161, No. 4, Ed. 1 Saturday, February 15, 2014
Semi-weekly newspaper from Bastrop, Texas that includes local, state and national news along with advertising.
Date:
February 15, 2014
Creator:
Wright, Cyndi
Object Type:
Newspaper
System:
The Portal to Texas History