In this report we discuss a technique for determining the rank of a matrix of a special type. The matrix is assumed to be composed of a matrix which has very low rank relative to its magnitude and a noise matrix component. The objective is to determine th...

The variational two-electron reduced-density-matrix (2-RDM) method allows for the computation of accurate ground-state energies and 2-RDMs of atoms and molecules without the explicit construction of an N-electron wave function. While previous work on variational 2-RDM theory has focused on calculating full configuration-interaction energies, this work ...

As it takes advantages of both nonnegativity and low rank, its results can be superior than ... Category 2: Applications -- Science and Engineering (Data- Mining ) ...

May 23, 2011 ... satisfying (12) is met (or test all the n options and choose the one which ..... [6] G.J.O. Jameson, Summing and nuclear norms in Banach space ...

problems of compressive sensing (CS, see, e.g., [9, 10, 16]) and there are ... the numerical experiments in magnetic resonance imaging (MRI) showed that this ...

In this paper we present a low-rank QR method for evaluating the discrete Biot-Savart law on parallel computers. It is assumed that the known current density and the unknown magnetic field are both expressed in a finite element expansion, and we wish to compute the degrees-of-freedom (DOF) in the basis function expansion of the magnetic field. The matrix that maps the current ...

The singular value decomposition is widely used in signal processing and data mining. Since the data often arrives in a stream, the problem of updating matrix decompositions under low-rank modification has been widely studied. Brand developed a technique in 2006 that has many advantages. However, the technique does not directly approximate the updated ...

We propose a new model for protein-protein interaction networks that is based on the assumption that interaction affinities approximately satisfy sets of linear constraints, and that there exist relatively few factors that influence the affinity levels. This model allows for inferring unknown protein-protein interactions using emerging algorithmic solutions from the area of low-rank ...

... Accession Number : ADA061990. Title : Accurate Evaluation of the Impedance Matrix Elements in the Hallen Integral Equation for Wire Antennas,. ...

Current analytical methods are inadequate for accurately measuring sulfur forms in coal. This task was concerned with developing methods to quantitate and identify major sulfur forms in coal based on direct measurement (as opposed to present techniques ba...

This paper reviews several recent multi-task learning algorithms in a general framework. Interestingly, the framework establishes a connection to recent collaborative filtering algorithms using low-rank matrix approximation. This connection suggests to build a more general nonparametric approach to collaborative preference learning that additionally ...

already have the Cholesky factorization of AHA T , and we want to solve a linear system with coefficient between AKA T and AHA T is a low rank matrix. In this case, the Cholesky factorization of AHA T can(H + � G \\Gamma � H)A T = AHA T + � A � D � A T ; 5 #12; namely, AKA T is a rank q�update of AHA

THEOREM FOR THE ORTHOGONAL RANK TENSOR DECOMPOSITION # TAMARA G. KOLDA + SIAM J. MATRIX ANAL. APPL. c decomposition of a k�way array for principal component analysis of multiway data, PTA�k, Linear Algebra Appl orthogonal rank tensor decomposition. Here, we present a counterexample to the extension of the Eckart

We describe a new algorithm, termed subspace evolution and transfer (SET), for solving low-rank matrix completion problems. The algorithm takes as its input a subset of entries of a low-rank matrix, and outputs one low-rank matrix consistent with the given observations. The completion task is ...

Covariance matrices capture correlations that are invaluable in modeling real-life datasets. Using all d 2 elements of the covariance (in d dimensions) is costly and could result in over-fitting; and the simple diagonal approximation can be over-restrictive. We present an algorithm that improves upon the diagonal matrix by allowing a low ...

The inorganic constituents in low-rank coals are distributed among ion-exchange sites of organic acid groups and clay minerals, coordination sites, oxides, and discrete mineral phases such as calcite, quartz, pyrite, and clay minerals. The unique ways in which these inorganics are bound within the coal can affect their behavior during ashing. The standard ASTM ashing procedure provides a means of ...

... of a matrix creating a linear system of equations. ... order accurate method for the heat equation and a ... is the same as that of the Laplace operator (see ...

Abstract. Suppose we are given a matrix that is formed by adding an unknown sparse matrix to an unknown low-rank matrix. Our goal is to decompose the given matrix into its sparse and low-rank components. Such a problem arises in a number of applications in model and system identification, and ...

... This fixture was designed to be reusable, provide accurate and reproducible data, and to eliminate premature 'brooming' failures. ...

Motivated by the hypothesis that dilatancy plays a critical role in faulting in subduction zones, we are developing FDRA, a software package to simulate two-dimensional quasi-dynamic faulting that includes rate-state friction, thermal pressurization, dilatancy (following Segall and Rice [1995]), and flash heating [Rice, 2006]. FDRA accommodates full- and half-space models of faults having physical ...

There are advantages of using the motion vector obtained from the MPEG video coding to perform target of interest identification in the field. In practice, however, environment noise, time-varying, and uncertainty factors affect their performance reliably and accurately detecting targets of interest. In this paper, we proposed a novel low ...

We consider the solution of the n by n system of linear equations, Ax = b, where A is both sparse and structured so that it may be expressed as A = p X i=1 A i : Sparse structured linear systems arise in many applications. The elementary matrices A i are of low rank, and are usually sparse so that their nonzero entries may be represented as a ...

Nonnegative matrix factorization (NMF) approximates a given data matrix as a product of two low-rank nonnegative matrices, usually by minimizing the L2 or the KL distance between the data matrix and the matrix product. This factorization was shown to be useful for several important computer ...

This work describes a methodology for the recovery of anomalies and their spectral signatures from compressively sensed multi-spectral video using Principal Component Pursuit (PCP). In video surveillance, approaches based on PCP allow the anomaly detection in a cluttered background by modeling a sequence of video frames as a large data matrix composed by a low-rank ...

Computational capability has been developed to adjust multi-group neutron cross-sections to improve the fidelity of boiling water reactor (BWR) modeling and simulation. The method involves propagating multi-group neutron cross-section uncertainties through BWR computational models to evaluate uncertainties in key core attributes such as core k-effective, nodal power distributions, thermal margins, ...

In this paper we present a low-rank QR method for evaluating the discrete Biot-Savart law. Our goal is to develop an algorithm that is easily implemented on parallel computers. It is assumed that the known current density and the unknown magnetic field are both expressed in a finite element expansion, and we wish to compute the degrees-of-freedom (DOF) in the basis function expansion of the ...

Kernel (or similarity) matrix plays a key role in many machine learning algorithms such as kernel methods, manifold learning, and dimension reduction. However, the cost of storing and manipulating the complete kernel matrix makes it infeasible for large problems. The Nystr�m method is a popular sampling-based low-rank approximation ...

A method for accurately approximating T-matrix elements in atom-diatom collisions is presented. Calculations are given for hydrogen helium collisions. (AIP)

In the matrix case, the best low-rank approximation can be obtained directly from the truncated singular value decomposition. However, the best rank-(R{sub 1},R{sub 2},...,R{sub N}) approximation of higher-order tensors cannot be computed in a straightforward way. An additional difficulty comes from an invariance property of the cost function by the action ...

We establish methods for quantum state tomography based on compressed sensing. These methods are specialized for quantum states that are fairly pure, and they offer a significant performance improvement on large quantum systems. In particular, they are able to reconstruct an unknown density matrix of dimension d and rank r using O(rdlog?2d) measurement settings, compared to ...

This paper presents an efficient algorithm for computing the transition probability in auxiliary field quantum Monte Carlo simulations of strongly correlated electron systems using a Hubbard model. This algorithm is based on a low rank updating of the underlying linear algebra problem, and results in significant computational savings. The computational ...

... two categories of risk assessment probability calculation ... redundancy if accurate assessments are to ... theory with matrix structural analysis methods. ...

A matrix-eigenvalue algorithm is presented for accurately computing the quasi-normal frequencies and

Accurate life prediction is critical to successful use of ceramic matrix composites (CMC). The tools

Fluid flow from a fractured rock matrix was investigated for accurately predicting oil recovery from fractured reservoirs. To relate the oil rate with rock geometry and average rock matrix pressure, a shape factor is used in the mathematical model of frac...

consideration is given to a combined treatment of the behavior of the fluid phases in the fractures and the rock matrix, which should model accurately the interchange processes between fractures and rock matrix the model equations which are valid in fractures and rock matrix, and we explain the interface

The standard coal demineralization procedure of Bishop and Ward, a modification of earlier work of Radmacher and Mohrhauer. is a strong acid treatment (consecutive exposure of the ground coal to 5N HCl, 48% HF, and 12N HCl, for 45 minute periods at 60 C) that effectively reduces the mineral matter concentration of the coal. The Bishop and Ward paper compared the determination of mineral matter in ...

The principal goal of coal char-steam gasification research at the University of North Dakota Energy Research Center (UNDERC) is to establish the feasibility of low-rank coal gasification for hydrogen production. The program has focused on determining reaction conditions for maximum product gas hydrogen content and on evaluating process kinetics with and without catalyst addition. The high ...

Accurate estimation of the in vivo locations of skeletal landmarks plays an integral role in several biomechanical research techniques. Because of rounding errors caused by instruments or skin movement, the data obtained through cinematography are usually not accurate and rise to a distance matrix which, because of the data errors, may ...

Wet carbonization is a thermochemical process for beneficiating low-rank coals. In this process, coals are heated in the presence of water to temperatures in the range of 400/degree/ to 650/degree/F at elevated pressure to prevent vaporization. The chemic...

One of the most significant achievements over the last several years in development of the SRC II process was extension of its applicability to include low-rank coals. With addition of moderate amounts of pyrite, operation was trouble-free and oil yields ...

Low rank coal is dewatered and upgraded by heating a coal/water mixture at 150* to 300* C. At a pressure preventing water vaporization, mechanically separating the water, then heating the coal at 300* to 400* C. At a pressure allowing water vaporization.

The objectives of this project are to evaluate the feasibility of carbon dioxide (CO(sub 2)) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (CBM) recovery as an added benefit of sequestration. The main ob...

The objectives of this project are to evaluate the feasibility of carbon dioxide (CO(sub 2)) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (CBM) recovery as an added benefit of sequestration. The main ob...

Low rank fuels are beneficiated by treatment with water at elevated temperature under superatmospheric pressure in the presence of hydrogen.

Methods of storing low-rank coals in the open for long periods without spontaneous combustion are discussed.

Research on low rank coals is reported as follows: removal of sodium by ion exchange; hot water drying (under pressure) of low rank coal; liquefaction of low rank coal; slagging fixed bed gasification; atmospheric fluidized-bed combustion; fouling of boiler by ashes; ...

Transportation costs are examined for four types of new fuel forms (solid, syncrude, methanol, and slurry) produced from low rank coals found in the lower 48 states of the USA. Nine low rank coal deposits are considered as possible feedstocks for mine mou...

Volume I contains articles on SO/sub x//NO/sub x/ control, waste management, low-rank direct liquefaction, hydrogen production from low-rank coals, and advanced wastewater treatment. These articles have been entered individually into EDB and ERA. (LTN)

Progress in UNDERC-low rank coal research programs is described: Treatment of gasification plant waste water, hydrogen production, fuel slurries, liquefaction of low rank coal, SO/sub 2//NO/sub x/ air pollution control, coal preparation, boilers fouling, fluidized-bed combustion, combustion additives, structural ...

Progress in UNDERC-low rank coal research programs is described: Treatment of gasification plant waste water, hydrogen production, fuel slurries, liquefaction of low rank coal, SO sub 2 /NO/sub x/ air pollution control, coal preparation, boilers fouling, ...

A new linear-scaling method is presented for the fast numerical evaluation of the electronic Coulomb potential. Our approach uses a simple real-space partitioning of the system into cubic cells and a spectral-element representation of the density in a tensorial basis of high-order Chebyshev polynomials. Electrostatic interactions between non-neighboring cells are described using the fast multipole ...

A new linear-scaling method is presented for the fast numerical evaluation of the electronic Coulomb potential. Our approach uses a simple real-space partitioning of the system into cubic cells and a spectral-element representation of the density in a tensorial basis of high-order Chebyshev polynomials. Electrostatic interactions between non-neighboring cells are described using the fast multipole ...

Recently several more efficient versions of quantum state tomography have been proposed, with the purpose of making tomography feasible even for many-qubit states. The number of state parameters to be estimated is reduced by tentatively introducing certain simplifying assumptions on the form of the quantum state, and subsequently using the data to rigorously verify these assumptions. The ...

Two perspective images of a single scene taken by uncalibrated cameras are related by a fundamental matrix, which is the key to solving many computer vision problems. We present a new robust and accurate algorithm to estimate the fundamental matrix, which is suitable for wide baseline stereo pairs. The estimation algorithm includes two ...

Principal components analysis and, more generally, the Singular Value Decomposition are fundamental data analysis tools that express a data matrix in terms of a sequence of orthogonal or uncorrelated vectors of decreasing importance. Unfortunately, being linear combinations of up to all the data points, these vectors are notoriously difficult to interpret in terms of the data ...

The authors applied Fourier Transform Infrared spectroscopy to emission-transmission measurements of isothermal, nonreacting particulate samples of char and coal. To interpret the data they extended the previous theory for nonscattering media to samples which scatter radiation. The use of the emission-transmission technique has two main advantages over just a single measurement. For coal and char ...

This project is concerned with the results of employing CO/sub 2//H/sub 2/O treatments on two low-rank coals. The coals employed in this project were North Dakota lignite from the Indianhead Mine and Utah subbituminous from the Sufco mine. This project is concerned with changes in slurry-relevant characteristics for these low-rank coals due to such treatments. These ...

The distribution of the organic oxygen content of coals among the principal oxygen containing functional groups typically is determined by a combination of chemical and spectroscopic methods (1,2) and results in a classification scheme such as % carboxyl, % hydroxyl, % carbonyl, and % ether. A notable subdivision in this classification scheme is the differentiation of phenols in a coal on the ...

A method for accurate computation of elastic and discrete inelastic scattering transfer matrices is discussed. In particular, a partition scheme for the source energy range that avoids integration over intervals containing points where the integrand has d...

We review the current status of Waterman's T-matrix approach which is one of the most powerful and widely used tools for accurately computing light ...

For fiber reinforced cement based composites, the principal beneficial effects of fibers (metallic, mineral or organic) accure after the matrix has cracked. For loads beyond which the matrix has initially cracked, the further crack extension and opening i...

The accurate incorporation of interface effects on creep in metal matrix composites is contingent on the direct experimental determination of the deformation kinetics. The goal is accomplished by isolating the composite interface and precisely measuring t...

HF chemical laser has provided a strong motivation for the accurate determination of dipole transition matrix elements. Moreover, the highly vibrationally excited ...

... popu- lar and successful scheme is the adjoint method. ... The Jacobian matrix method performs well even when ... 4 High-Order Difference Schemes ...

... We consider the quasi-linear case wherein F = AW , A being a ... dimensional systems (say x,y,z and t or x ... If the matrix A of the hyperbolic system (1) is ...

Jun 25, 2003 ... Furthermore, modeling of the voids collected via NDE offered an analytical advantage that resulted in more accurate assessments of the ...

... which rely on pore shapes and the low cycle fatigue response of the fully dense matrix, accurately predict the number of cycles necessary to initiate ...

7.2.2 GPS Analysis, IVP Determination, Alignment and SINEX. ... accurate connections and their associated variance covariance matrix, and provided an un- ...

Program, BLIMP, provides fast, highly accurate solution to general class of gas-phase boundary layer

A frequency synthesizer is provided that is capable of supplying a plurality of accurate frequencies. The frequency synthesizer comprises a resonator matrix including a plurality of resonators embedded in a single monolithic piece of piezoelectric crystal...

... for an accurate fracture toughness testing technique for ... lengths of small glass-ceramic composite ... release rate of interlaminar delamination growth ...

An improved sparse-matrix factorization technique for the transfer matrix of the hard-square lattice gas is proposed to perform exact diagonalization up to the strip width N = 34. The critical point, critical free-energy density, and universal parameters are determined accurately. The eigenvalue spectrum of the transfer ...

The core of the support vector machine (SVM) problem is a quadratic programming problem with a linear constraint and bounded variables. This problem can be transformed into the second order cone programming (SOCP) problems. An interior-point-method (IPM) can be designed for the SOCP problems in terms of storage requirements as well as computational complexity if the kernel ...

Influenza viruses have been responsible for large losses of lives around the world and continue to present a great public health challenge. Antigenic characterization based on hemagglutination inhibition (HI) assay is one of the routine procedures for influenza vaccine strain selection. However, HI assay is only a crude experiment reflecting the antigenic correlations among testing antigens ...

Influenza viruses have been responsible for large losses of lives around the world and continue to present a great public health challenge. Antigenic characterization based on hemagglutination inhibition (HI) assay is one of the routine procedures for influenza vaccine strain selection. However, HI assay is only a crude experiment reflecting the antigenic correlations among testing antigens ...

An investigation was carried out on the adsorption and desorption of moisture in chars of low rank coal. Equilibrium moisture sorptions of dry and moist chars were measured at room temperature and relative humidity of 30% and 80%. Based on these measurements, a novel mathematical model was developed to predict both the rate and the level of hydration for ...

We present an efficient low-rank updating algorithm for updating the trial wave functions used in quantum Monte Carlo (QMC) simulations. The algorithm is based on low-rank updating of the Slater determinants. In particular, the computational complexity of the algorithm is O(kN) during the kth step compared to traditional algorithms that require O(N(2)) computations, where N is ...

We present an efficient low-rank updating algorithm for updating the trial wave functions used in quantum Monte Carlo (QMC) simulations. The algorithm is based on low-rank updating of the Slater determinants. In particular, the computational complexity of the algorithm is (kN) during the kth step compared to traditional algorithms that require (N2) computations, where N is the ...

Statistically based iterative approaches for image reconstruction have gained much attention in medical imaging. An accurate system matrix that defines the mapping from the image space to the data space is the key to high-resolution image reconstruction. However, an accurate system matrix is often associated with ...

One objective of this program is to prepare polymer models having phenolic, carboxylic, and/or aryl ether groups considered to be important in low rank coals. In order to study the chemistry of these functional groups in a polymeric matrix, it is necessary that the polymer backbone itself should not be subject to cleavage under the ...

Practicaldataminingrarelyfalls exactlyinto the supervisedlearning scenario. Rather, the growing amount of unlabeled data poses a big challenge to large-scale semi-supervised learning (SSL). We note that the computationalintensivenessofgraph-based SSLarises largely from the manifold or graph regularization, which in turn lead to large models that are dificult to handle. To alleviate this, we ...

The objective of this research is to evaluate the technical feasibility of producing low-cost hydrogen by catalytic steam gasification of low-rank coals. This approach takes advantage of the high reactivity, volatile matter, moisture concentrations, and inherent alkali content of low-rank coals. Bench-scale investigations of low-rank coal steam gasification have already shown product gas ...

The hyperspectral image cube can be modeled as a three dimensional array. Tensors and the tools of multilinear algebra provide a natural framework to deal with this type of mathematical object. Singular value decomposition (SVD) and its variants have been used by the HSI community for denoising of hyperspectral imagery. Denoising of HSI using SVD is achieved by finding a low ...

This project examines the results of employing batch treatments of aqueous carbon dioxide on two low-rank coals: (1) a North Dakota lignite, and (2) a Utah subbituminous. Such treatments were evaluated in terms of the changes in slurry-relevant characteristics, such as equilibrium moisture, ash content and composition, grindability and slurry rheology, for these coals. ...

The principal goal of coal char-steam gasification research is to establish the feasibility of low-rank coal gasification for hydrogen production. The program has focused on determining reaction conditions for maximum product gas hydrogen content and on evaluating process kinetics with and without catalyst addition. The high inherent reactivity of lignites and subbituminous coals, compared to ...

We use convex relaxation techniques to provide a sequence of regularized low-rank solutions for large-scale matrix completion problems. Using the nuclear norm as a regularizer, we provide a simple and very efficient convex algorithm for minimizing the reconstruction error subject to a bound on the nuclear norm. Our algorithm Soft-Impute iteratively ...

We use convex relaxation techniques to provide a sequence of regularized low-rank solutions for large-scale matrix completion problems. Using the nuclear norm as a regularizer, we provide a simple and very efficient convex algorithm for minimizing the reconstruction error subject to a bound on the nuclear norm. Our algorithm Soft-Impute iteratively ...

To improve the current status of home multilayer optical coating design with low speed and poor efficiency when a large layer number occurs, the accurate calculation and fast realization of merit function�s gradient and Hesse matrix is pointed out. Based on the matrix method to calculate the spectral properties of multilayer optical ...

Transportation costs are examined for four types of new fuel forms (solid, syncrude, methanol, and slurry) produced from low rank coals found in the lower 48 states of the USA. Nine low rank coal deposits are considered as possible feedstocks for mine mouth processing plants. Transportation modes analyzed include ...

The invention described is a process for improving the performance of a commercial coal or lignite fired boiler system by supplementing its normal coal supply with a controlled quantity of thermally beneficiated low rank coal, (TBLRC). This supplemental TBLRC can be delivered either to the solid fuel mill (pulverizer) or directly to the coal burner feed ...

This report is a detailed review of the progress in research programs at the University of North Dakota Energy Research Center on low rank coals, involving especially: gasification pilot plant waste water treatment and reuse, hydrogen production, coal-water slurry production (and study of rheology of slurries and coal drying), combustion and fluidizied-bed ...

Dec 31, 2009 ... that ? ? ?, which is the support of the index set of non-zero entries of E. ...... On the numerical solution of the heat conduction problem ...

... model falls into the applicable scope of the classical augmented Lagrangian method. ... Category 2: Applications -- Science and Engineering (Statistics ) ...

Starvation foods: muskrats, beaver, other low rank wild game (zooarchaeology) � Fish size small; overharvested

In this paper, the natural frequencies and mode shapes of a cracked beam are obtained using the finite element method. An `overall additional flexibility matrix', instead of the `local additional flexibility matrix', is added to the flexibility matrix of the corresponding intact beam element to obtain the total flexibility ...

Many detection algorithms in hyperspectral image analysis, from well-characterized gaseous and solid targets to deliberately uncharacterized anomalies and anomlous changes, depend on accurately estimating the covariance matrix of the background. In practice, the background covariance is estimated from samples in the image, and imprecision in this estimate ...

In calculations using matrix Pade approximants, an off-shell momentum (or several off-shell momenta) is introduced. In previous work, this momentum was chosen arbitrarily and not varied. However, it is a variational parameter and may be varied to find points where the phase shift has an extreme value. At such points, the matrix Pade approximants are ...

We propose a method for including the fractional occupancy of electronic energy levels within a tight-binding density-matrix formalism. This method is based on successful techniques used in first-principles methods. Molecular-dynamics test simulations show that the density-matrix technique accurately reproduces the physics of a ...

Greenhouse gases such as carbon dioxide (CO2) may be to blame for a gradual rise in the average global temperature. The state of Texas emits more CO2 than any other state in the U.S., and a large fraction of emissions are from point sources such as power plants. CO2 emissions can be offset by sequestration of produced CO2 in natural reservoirs such as coal seams, which may initially contain ...

Development of the K-Fuel technology began after the energy shortage of the early 1970s in the United States led energy producers to develop the huge deposits of low-sulfur coal in the Powder River Basin (PRB) of Wyoming. PRB coal is a subbituminous C coal containing about 30 wt % moisture and having heating values of about 18.6 megajoules/kg (8150 Btu/lb). PRB coal contains from 0.3 to 0.5 wt % ...

Wet carbonization is a thermochemical process for beneficiating low-rank coals by heating the coal in the presence of water to temperatures in the range of 400 sup 0 to 650 sup 0 F. Wet carbonization produces a low-rank coal product with a higher heating ...

This report presents the work performed by the Institute of Gas Technology (IGT) from November 1, 1985 through January 31, 1986, under DOE Contract No. DE-AC21-84MC21225 for the project, ''Wet Carbonization of Lump-Size Low-Rank Coals by a Novel Non-slurr...

This paper discusses the possible use of low rank coals in advanced power generation systems similar to those being demonstrated under the Clean Coal Technology Demonstration Program. The results of the studies made on integrated gasification combined cycle and pressurized fluidized-bed combustion using low rank ...

This project is concerned with the results of employing CO sub 2 /H sub 2 O treatments on two low-rank coals. The coals employed in this project were North Dakota lignite from the Indianhead Mine and Utah subbituminous from the Sufco mine. This project is...

A process is described for reducing the spontaneous combustion tendencies of thermally beneficiated low rank coals employing heat, air or an oxygen containing gas followed by an optional moisture addition. Specific reaction conditions are supplied along with knowledge of equipment types that may be employed on a commercial scale to complete the process. 3 ...

A process for reducing the spontaneous combustion tendencies of thermally beneficiated low rank coals employing heat, air or an oxygen containing gas followed by an optional moisture addition. Specific reaction conditions are supplied along with knowledge of equipment types that may be employed on a commercial scale to complete the process.

A process for reducing the spontaneous combustion tendencies of thermally beneficiated low rank coals employing heat, air or an oxygen containing gas followed by an optional moisture addition. Specific reaction conditions are supplied along with knowledge of equipment types that may be employed on a commercial scale to complete the process.

The Bureau of Mines has performed research on a fluid-bed magnetic roasting process for nonmagnetic taconites which uses low-rank coals and lignites as reductants and fuels. Roasting tests on a Michigan nonmagnetic taconite were conducted at temperatures ...

The objective of this report is to present available information on factors relating to ash fouling and slagging when burning low rank coals in a single reference document to be used by boiler designers, plant operators and coal researchers. The report pr...

The objective of this report is to present available information on factors relating to ash fouling and slagging when burning low rank coals in a single reference document to be used by boiler designers, plant operators and coal researchers. The report pr...

A process for upgrading and stabilizing low-rank coal involving the sequential processing of the coal through three fluidized beds; first a dryer, then a pyrolyzer, and finally a cooler. The fluidizing gas for the cooler is the exit gas from the pyrolyzer with the addition of water for cooling. Overhead gas from pyrolyzing is likely burned to furnish the energy for the ...

This report describes a series of field and laboratory studies of the characteristics and control of fly ash emissions from low-rank Western coals. Field tests were conducted at three pulverized coal-fired utility boilers burning low-rank Western coals. E...

This patent describes a process for the beneficiation of low rank coal, the process comprising the steps of: subjecting raw low rank coal to treatment with a liquid water-insoluble organic medium, the liquid water-insoluble organic medium having a boiling point in the range of from about 40/sup 0/ to about 80/sup ...

Volume III, Combustion Research, contains articles on fluidized bed combustion, advanced processes for low-rank coal slurry production, low-rank coal slurry combustion, heat engine utilization of low-rank coals, and Great Plains Gasification Plant. These articles have been entered individually into EDB and ERA. (LTN)

Research programs on low rank coal are presented. Topics include: SO(sub x)/NO(sub x) Control, waste management, turbine combustion phenomena, combustion phenomena, combustion inorganic transformation, coal/char reactivity, liquefaction reactivity of low-...

The UNDERC quarterly report involves testing use of cooling water made up of heated Great Plains gasification plant waste water, the preparation of coal slurries made of hot water dried low rank coal, boiler fouling by ash deposits, fluidized-bed combusti...

This report is a detailed review of the progress in research programs at the University of North Dakota Energy Research Center on low rank coals, involving especially: gasification pilot plant waste water treatment and reuse, hydrogen production, coal-wat...

The quarterly report on low-rank coal research contains information on (1) gasification waste water, water treatment and reuse, (2) hydrogen production from low-rank coals, (3) preparation and combination of coal water slurries, including coal preparation...

The coal research work of the University of North Dakota Energy Research Center is reviewed: coal gasification waste water and its treatment for reuse in cooling towers; hydrogen production from low rank coal (reactivity and catalysts); coal-water slurry ...

The Quarterly Technical Progress Report for the University of North Dakota Energy Research Center includes work on gasification waste water treatment and reuse, hydrogen production, coal/water slurry preparation, low rank coal liquefaction, SO/sub x//NO/s...

Progress in research programs on low rank coal is reported under the following headings: Gasification wastewater treatment and reuse, hydrogen production, preparation of coal-water fuel slurries, coal liquefaction, 50/sub x//NO/sub x/ control, particualte...

Progress reports are presented for the following tasks: (1) gasification wastewater treatment and reuse; (2) fine coal cleaning; (3) coal-water slurry preparation; (4) low-rank coal liquefaction; (5) combined flue gas cleanup/simultaneous SO/sub x/-NO/sub...

The intent of this project was to demonstrate that Alaskan low-rank coal, which is high in volatile content, need not be ground as fine as bituminous coal (typically low in volatile content) for optimum combustion in power plants. The grind or particle si...

EPRI and the Technische Vereinigung des Grosskraftswerkbetreiber (Technical Association of Large Power Plant Operators) (VGB) jointly held a Conference on Lignites and Low Rank Coals in Wiesbaden, Germany, May 16-18, 2001. These Proceedings include the plenary papers, technical session papers, and rapporteurs' summaries from the conference.

The objectives of this program involve the study of the catalysis of liquefaction of low rank coals. Ion exchange and adsorption techniques are being used or modified to incorporate catalytically active metals into coal samples. Relative oil yields will be determined by Sandia National Laboratory and PETC collaborators to establish the effectiveness of the ...

Twelve fly ashes and five bottom ashes were obtained from power stations burning low-rank western coals. These low-rank coals included subbituminous coals from the Rocky Mountain region and lignites from the Northern Great Plains and the Gulf Coast. Batch...

Coking properties of perhydrous low-rank vitrains. Influence of pyrolysis conditions Fatima Laggoun efficient for their cokefaction, each of the pyrolysis methods does not lead to solid residues chemically composition of the precursors and/or the pyrolysis conditions. FTIR data show that perhydrous vitrains

Low rank coals were found to be soluble in dilute NaOH solutions. Solubilities of coals were highest in coals containing >20% oxygen. Solubilized coals could easily be separated from insoluble mineral inclusions and recovered by the addition of calcium at concentrations greater than 10mM. The potential use of this treatment for coal processing is ...

The objectives of this project are to evaluate the feasibility of carbon dioxide (CO2) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (ECBM) recovery as an added benefit of sequestration. The main objecti...

The objectives of this project are to evaluate the feasibility of carbon dioxide (CO2) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (ECBM) recovery as an added benefit of sequestration. The main objecti...

The objectives of this project are to evaluate the feasibility of carbon dioxide (CO2) sequestration in Texas low-rank coals and to determine the potential for enhanced coalbed methane (ECBM) recovery as an added benefit of sequestration. The main objecti...

The overall goal of this project is to find biological methods to remove carboxylic functionalities from low rank coals under ambient conditions and to assess the properties of these modified coals towards coal liquefaction. The main objectives for this quarter were: (1) enrichment of anaerobic microbial consortia in a coal fed chemostat, (2) ...

Degenerative disc disease has been implicated as a major component of spine pathology. The current major clinical procedures for treating disc degeneration have been disappointing, because of altered spinal mechanics leading to subsequent degeneration at adjacent disc levels. Disc pathology treatment is shifting toward prevention and treatment of underlying etiologic processes at the level of the ...

A density matrix based time-dependent density functional theory is extended in the present work. Chebyshev expansion is introduced to propagate the linear response of the reduced single-electron density matrix upon the application of a time-domain delta-type external potential. The Chebyshev expansion method is more efficient and ...

Computational protein structure prediction remains a challenging task in protein bioinformatics. In the recent years, the importance of template-based structure prediction is increasing because of the growing number of protein structures solved by the structural genomics projects. To capitalize the significant efforts and investments paid on the structural genomics projects, it is urgent to ...

The authors express a predicted time interval (or frequency) of a single clock as a weighted sum of frequency data obtained by calibrations against a primary standard, and derive a matrix equation for the optimum weighting coefficients (called the optimum...

A boundary element method is developed for the 1-D nodal diffusion equation in cylindrical geometry. This method retains the matrix qualities of the nodal formulation while providing an accurate computational benchmark for evaluating reactor analysis codes.

The extractability of the phenolic compounds is influenced by their chemical structure, degree of polymerization, and interaction with other components in the matrix. This talk describes the influence of sample preparation parameters (extraction techniques, extraction solvents, temperature, pressu...

There has been no accurate procedure for modeling the high-speed impact of composite materials, but such an analytical capability will be required in designing reliable lightweight engine-containment systems. The majority of the models in use assume a lin...

advantage of this analysis-based approach over the classical basis pursuit in solving ... of numerical experiments comparing various methods against problems ... of the case where the matrix A is orthogonal, this functional dependence is hard ...

The special case of a triangular transfer matrix relevant to multigroup transport theory in multislabs with Lth order anisotropic scattering is discussed, and the F/sub N/ method is used to establish accurate numerical results for a real problem.

The objectives of our work for AFOSR include the following: Develop new theory based upon coupled-cluster theory, density functional theory, and density matrix functional theory to more accurately and easily describe the structure, spectra, and reactions ...

A review on dissociative recombination between positive ions and negative ions of polycyclic aromatic hydrocarbons has been published. Accurate R-matrix calculations of dielectronic recombination of 0+ have been made. A new recombination process, tidal te...

The paper considers problems dealing with statistical methods in reactor physical experiment theory. The problems are as follows: more accurate determination of constant values on the basis of the experiment carried out, and determination of corrections p...

The need for an accurate fracture toughness testing technique for fiber reinforced ceramic composites was identified. A technique was developed to measure small crack mouth displacements over small gauge lengths of small glass-ceramic composite specimens ...

Transformity is one of the core concepts in Energy Systems Theory and it is fundamental to the calculation of emergy. Accurate evaluation of transformities and other emergy per unit values is essential for the broad acceptance, application and further development of emergy method...

Miranda is a high order hydrodynamics code for computing fluid instabilities and turbulent mixing. It employs FFTs and band-diagonal matrix solvers for computing spectrally-accurate derivatives, combined with high-order integration methods for time advanc...

, and in a solid trehalose matrix. Measurements are also presented that provide an accurate determination are modified somewhat but are still independent of viscosity. The experiments in trehalose give the dynamics, experiments are also presented on HbCO in trehalose, a glassy solvent at room temperature. Examination

A practicable and sufficiently accurate stiffness matrix method for estimating the contribution of a floor system to the overall elastic stiffness of moment-resisting space frames is developed. The floor system considered consisted of a two-way reinforced...

An algorithm for computing the characteristic values of nonsymmetric matrices by minicomputers in BASIC language was investigated. Starting from the QR method, it was found that a simple resolving matrix can be computed, leading to more accurate results. ...

We demonstrate the applicability of four-body exponentially correlated functions for the accurate calculations of relativistic effects in lithium-like atoms and present results for matrix elements of various operators which involve negative powers of interparticle distances.

cretizations of differential equations and can be solved more accurately as their .... where W is the diagonal matrix with the wi's as diagonal elements, e is ..... second partial derivatives, we have formulated our test problems in ampl [7]. ...

A two-year program to develop advanced 3D inelastic structural stress analysis methods and solution strategies for more accurate and cost effective analysis of combustors, turbine blades, and vanes is described. The approach was to develop a matrix of for...

The dual-continuum random-walk particle tracking approach is an attractive simulation method for simulating transport in a fractured porous medium. In order to be truly successful for such a model, however, the key issue is to properly simulate the mass transfer between the fracture and matrix continua. In a recent paper, Pan and Bodvarsson (2002) proposed an improved scheme ...

A method for obtaining protein molecular masses with an accuracy of approximately {plus minus}0.01% by matrix-assisted laser desorption using an internal calibrant is described. The technique allows accurate mass determinations of protein sample sizes as small as 1 pmol. High concentrations of organic and inorganic contaminants (e.g. 1 M urea) do not ...

Currently, an area of interest and frustration for coal chemists has been the direct liquefaction of low rank coal. Although low rank coals are more reactive than bituminous coals, they are more difficult to liquefy and offer lower liquefaction yields under conditions optimized for bituminous coals. Solomon, Serio, ...

The objective of this report is to present available information on factors relating to ash fouling and slagging when burning low rank coals in a single reference document to be used by boiler designers, plant operators and coal researchers. The report presents detailed information on coal properties, boiler design and operating experience compiled and ...

The equations connecting elements of the Yukawa matrix to elements of the active neutrino mass matrix in the ? MSM theory (an extension of the Standard Model by a singlet of three right-handed neutrinos) was analyzed, and explicit relations for the ratio of the Yukawa matrix elements and elements of the active neutrino mass ...

In this paper, the authors examine the mechanisms involved in gas/oil drainage and water-oil imbibition and propose a simple way to represent that behavior in a dual-porosity simulator. Basically, the formulation uses pseudo-capillary-pressure curves for both the matrix and fracture. The fracture curve can be determined directly from rock properties and ...

In recent years the usefulness of fast Laplace solvers has been extended to problems on arbitrary regions in the plane by the development of capacitance matrix methods. The solution of the Dirichlet and Neumann problems for Helmholtz's equation is considered. It is shown that, by an appropriate choice of the fast solver, the capacitance matrix can ...

In electrical capacitance tomography (ECT), a sensitivity matrix is usually calculated based on high permittivity perturbation with a low permittivity background and a fixed sensitivity matrix is used for both one-step and linear iterative image reconstruction. This paper presents a nonlinear iterative method with the sensitivity ...

The quadrupole strengths, beam position monitor (BPM) gains, and orbit correction magnet strengths were adjusted in a computer model of the NSLS X-Ray ring in order to best fit the model orbit response matrix to the measured matrix. The model matrix was fit tot the 4320 data points in the measured matrix with an ...

An accurate procedure based on micro-gravimetry has been used for the preparation of volatile, hazardous organic chemicals in a nitrogen matrix in pressurized gas cylinders at analyte concentrations ranging from 10 ppb to 10 ppm, by mole. In this technique, the organics of intere...

Accurate fusion product data is required for most fusion plasma simulations. The energy broadening of reaction products is demonstrated to be more complicated than the usual Gaussian broadening. The accurate integrals are performed to obtain , , and for all binary reactions in the four- and five-nucleon systems. Reaction cross sections were developed ...

A complete system of the B-spline solutions for the Dirac equation with the parity-nonconserving (PNC) weak-interaction effective potential is obtained. This system can be used for the accurate evaluation of the radiative corrections to the PNC amplitudes in the multicharged ions and neutral atoms. The use of the scaling procedure allows for the evaluation of the PNC ...

A new dual-porosity model is developed for single-phase flow in fractured/porous media. As in the commonly-used approach, flow is assumed to take place through the fracture network, and between the fractures and matrix blocks. The matrix blocks are treated in a lumped-parameter manner, with a single average pressure used for each ...

The uncertainties in the theoretical nuclear {beta}{beta}-decay matrix elements have a severe impact on the selection and design of experiments as well as on the analyses of their data. It is clearly demonstrated that the discovery of a error in the code of recent calculations has made a giant difference in the predicted impacts of several experiments now in planning or under ...

A fast and accurate method for chloride ion determination in zirconia-magnesia matrix was studied the method consists in the pyro hydrolysis of the oxides at 900(sup o) C, using a quartz apparatus, during thirty minutes and further determination of the ch...

By means of a variational calculation using matrix product states with periodic boundary conditions, we accurately determine the extension of the spin-supersolid phase predicted to exist in the spin-1 anisotropic Heisenberg chain. We compute both the structure factor and the superfluid stiffness and extract the critical exponents of the supersolid-to-solid ...

flow in fractured rock is of interest in many engineering fields. This has been a subject of active to consider the behavior of the fluid phases in the fractures and the rock matrix and should model accurately the interchange processes between fractures and rock matrix. Some researchers (Nelson, 1985; Haneberg et al., 1999

A previously developed analytical formulation has been modified in order to more accurately account for the effects of hydrostatic stresses on the nonlinear, strain rate dependent deformation of polymer matrix composites. State variable constitutive equat...

ICP emission analyses are prone to errors due to changes in power level, nebulization rate, plasma temperature, and sample matrix. As a result, accurate analyses of complex samples often require frequent bracketing with matrix matched standards. Informati...

Elemental fractionation during LA-ICP-MS analysis of silicate glasses: implications for matrix. With increasing transparency of glasses, LA-ICP-MS analyses showed progressive volatility dependence with an accuracy of better than 10%. In non-transparent samples, the greatest limitation to accurate LA-ICP-MS

The density matrix renormalization group (DMRG) approach is extended to complex-symmetric density matrices characteristic of many-body open quantum systems. Within the continuum shell model, we investigate the interplay between many-body configuration interaction and coupling to open channels in case of the unbound nucleus {sup 7}He. It is shown that the extended DMRG ...

NASA Glenn Research Center's Micromechanics Analysis Code with Generalized Method of Cells (MAC/GMC) (ref.1) has been extended to enable fully coupled macro-micro deformation, failure, and fatigue life predictions for advanced metal matrix, ceramic matrix...

Functional dependences of eigenvalues as functions of sorted diagonal elements are given for realistic nuclear shell model (NSM) hamiltonian, the uniform distribution hamiltonian and the GOE hamiltonian. In the NSM case, the dependence is found to be linear. We discuss extrapolation methods for more accurate predictions for low-lying states.

The R-matrix method is applied to the Continuum Discretized Coupled Channel (CDCC) approximation. The variational basis is chosen as Lagrange functions, which are shown to be efficient and accurate. We apply the general formalism to the d + 58Ni elastic scattering at Ed = 80 MeV. Future developments are briefly discussed.

The differential equations describing stellar oscillations are transformed into an algebraic eigenvalue problem. Frequencies of adiabatic oscillations are obtained as the eigenvalues of a banded real symmetric matrix. The Cowling-approximation is employed, i.e. the Eulerian perturbation of the gravitational potential is neglected, and, in order to preserve selfadjointness, it ...

We develop a new tomographic imaging reconstruction algorithm for a two-layer tissue structure. Simulations and phantom experiments show more accurate reconstruction of target optical properties compared with those results obtained from a semi-infinite tissue model for layered structures. This improvement is mainly attributed to the more accurate ...

The objective of the current MITRE study is to estimate the cost of the coal derived liquid products that result from processing low rank coals in the Wilsonville and HRI CTSL configurations. The resultant cost of liquids is then compared to liquids produced from bituminous coals. The methodology used to accomplish the above objective was to utilize the ...

A composition is described including a fuel selected from the group consisting of an oil coated low rank coal and an oil coated peat. The fuel has a moisture content of less than about 5% by weight ground to a 75% minus 200 mesh and water. The composition comprises on a weight percent basis between about 44 to about 70% coal, from about 29 to about 55% ...

The objective of this report is to present available information on factors relating to ash fouling and slagging when burning low rank coals in a single reference document to be used by boiler designers, plant operators and coal researchers. The report presents detailed information on coal properties, boiler design and operating experience compiled and ...

The studies have been conducted on low rank coal: Flambant de Provence, France, PRV=0.44 FTIR and UV synchronous fluorescence spectroscopy are used to study structural changes in low rank coal after natural oxidation or acid (HCl/HF) demineralization. The observed variations deal mainly with a decrease in ...

The technical approach of the contract has been expanded to provide additional economic evaluation of related process options. Additional data will be developed in the following areas to facilitate these evaluations. The effect of several modified pretreatments on liquefaction will be investigated. These include catalytic and thermal dewaxing of distillate solvents, the effect that adding light ...

Different definitions of the reaction matrix G appropriate to the calculation of nuclear structure are reviewed and discussed. Qualitative physical arguments are presented in support of a two-step calculation of the G-matrix for finite nuclei. In the first step the high-energy excitations are included using orthogonalized plane-wave intermediate states, ...

Novel high-throughput sample preparation strategies for MALDI imaging mass spectrometry (IMS) and profiling are presented. An acoustic reagent multispotter was developed to provide improved reproducibility for depositing matrix onto a sample surface, for example, such as a tissue section. The unique design of the acoustic droplet ejector and its optimization for depositing ...

For the two exit arrangements of the F + HD reaction, the full scattering matrix is obtained by exact quantum dynamics on an accurate potential energy surface. The S matrix is expressed in the stereodirected representation, for the first time, for all channels of a triatomic reaction. We analyze a collision energy where the dominant ...

A method for the determination of arsenic in whole human blood is presented. To decrease the matrix effects from this complex sample, the blood was prediluted with a matrix modifier solution. The modifier solution contained a surfactant, Triton X-100, which homogenized the sample and allowed accurate pipetting by an autosampler. The ...

A new method of analyses for linear induction machines, the matrix method, has been developed. The method handles linear induction motors, both single- and double-sided, and linear induction liquid metal pumps and generators, both flat and annular. The primary currents can be prescribed, calculated from prescribed phase voltages, or optimized for maximum machine efficiency. ...

The association between inherent ionizing radiation sensitivity and DNA supercoil unwinding in mammalian cells suggests that the DNA-nuclear matrix attachment region (MAR) plays an important role in radiation response. In radioresistant cells, the MAR structure may exist in a more stable, open configuration, limiting DNA unwinding following strand break induction and ...

The association between inherent ionizing radiation sensitivity and DNA supercoil unwinding in mammalian cells suggests that the DNA-nuclear matrix attachment region (MAR) plays an important role in radiation response. In radioresistant cells, the MAR structure may exist in a more stable, open configuration, limiting DNA unwinding following strand break induction and ...

Interphases in unidirectional fiber-reinforced composites under transverse loading are modeled using an advanced boundary element method (BEM) based on the elasticity theory. The interphases are treated as elastic layers between the fiber and matrix, as opposed to the springlike models in the BEM literature. Stress intensity factors for interface cracks between the interphase ...

An expression connecting the vibration-rotation matrix elements of various powers of the internuclear displacement from equilibrium for derived via quantum mechanicall commutator relations. This expression can be solved by an iterative procedure and used to generate the diagonal elements. For off-diagonal elements, additional information avaliable through sum rules ...

The Moore-Penrose inverse of an arbitrary matrix (including singular and rectangular) has many applications in statistics, prediction theory, control system analysis, curve fitting and numerical analysis. In this paper, an algorithm based on the conjugate Gram-Schmidt process and the Moore-Penrose inverse of partitioned matrices is proposed for computing the pseudoinverse of ...

A comparison is made between matrix elements calculated using the uncoupled channel Sussex approach to second order in DWBA and matrix elements calculated using a square well potential. The square well potential illustrated the problem of the determining parameter independence balanced with the concept of phase shift difference. The supersoft core ...

Current analytical methods are inadequate for accurately measuring sulfur forms in coal. This task was concerned with developing methods to quantitate and identify major sulfur forms in coal based on direct measurement (as opposed to present techniques based on indirect measurement and difference values). The focus was on the forms that were least understood and for which the ...

One objective of this program is to prepare polymer models having phenolic, carboxylic, and/or aryl ether groups considered to be important in low rank coals. In order to study the chemistry of these functional groups in a polymeric matrix, it is necessary that the polymer backbone itself should not be subject to cleavage under the ...

Lignite and subbituminous coals were investigated for their ability to support microbial methane production in laboratory incubations. Results show that naturally-occurring microorganisms associated with the coals produced substantial quantities of methane, although the factors influencing this process were variable among different samples tested. Methanogenic microbes in two coals from the Powder ...

Acid pretreatment removes those alkaline metal and alkaline earth cations which inhibit coal reactivity and hydrogen transfer. Shams et al. (1992) found that through this pretreatment a large portion of the calcium present in coal was removed. Hydrochloric acid was used in that study, but sulfurous acid, if similar results are achieved, would be a much more suitable acid for processing. Another ...