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1

Deuteron bremsstrahlung-weighted photonuclear sum rule  

SciTech Connect

The various contributions to the deuteron bremsstrahlung-weighted photonuclear sum rule sigma/sub -1/ are analyzed. It is shown that the unretarded normal L = 1 sum rule is model independent and that retardation, higher multipoles, and interaction effects are negligible. An accurate estimation of sigma/sub -1/ is provided by the knowledge of the charge deuteron radius and of the spin gyromagnetic factors of the proton and of the neutron.

Bohigas, O.; Lipparini, E.

1987-11-01

2

A Solution to Weighted Sums of Squares as a Square  

ERIC Educational Resources Information Center

For n = 1, 2, ... , we give a solution (x[subscript 1], ... , x[subscript n], N) to the Diophantine integer equation [image omitted]. Our solution has N of the form n!, in contrast to other solutions in the literature that are extensions of Euler's solution for N, a sum of squares. More generally, for given n and given integer weights m[subscript…

Withers, Christopher S.; Nadarajah, Saralees

2012-01-01

3

On weighted rank-sum tests for dispersion  

Microsoft Academic Search

Summary  Here is proposed a class of two sample non-parametric scale tests (for both the situations, viz., with and without assuming\\u000a the identity of the locations) based on a family of congruent inter-quantile numbers, and their various properties have been\\u000a studied. A class of appropriate weightfunctions has also been proposed here, and the corresponding weighted rank-sum tests\\u000a appear to be asymptotically

P. K. Sen

1963-01-01

4

26 CFR 1.167(b)-3 - Sum of the years-digits method.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01false Sum of the years-digits method.1.167...and Corporations § 1.167(b)-3Sum of the years-digits method. (a) Applied...asset—(1) General rule. Under the sum of the years-digits method...

2010-04-01

5

Signed Digit Representations of Minimal Hamming Weight  

Microsoft Academic Search

The authors give an online algorithm for computing a canonical signed digit representation of minimal Hamming weight for any integer n. Using combinatorial techniques, the probability distributions Pr[Kr=h], where Kr is taken to be a random variable on the uniform probability space of k-digit integers is computed. Also, using a Markov chain analysis, it is shown that E(Kr)~(r-1)k \\/(r+1) as

Steven Arno; Ferrell S. Wheeler

1993-01-01

6

On the time-weighted quadratic sum of linear discrete systems  

NASA Technical Reports Server (NTRS)

A method is proposed for obtaining the time-weighted quadratic sum for linear discrete systems. The formula of the weighted quadratic sum is obtained from matrix z-transform formulation. In addition, it is shown that this quadratic sum can be derived in a recursive form for several useful weighted functions. The discussion presented parallels that of MacFarlane (1963) for weighted quadratic integral for linear continuous systems.

Jury, E. I.; Gutman, S.

1975-01-01

7

Weighting in digital synthetic aperture radar processing  

NASA Technical Reports Server (NTRS)

Weighting is employed in synthetic aperture radar (SAR) processing to reduce the sidelobe response at the expense of peak center response height and mainlobe resolution. The weighting effectiveness in digital processing depends not only on the choice of weighting function, but on the fineness of sampling and quantization, on the time bandwidth product, on the quadratic phase error, and on the azimuth antenna pattern. The results of simulations conducted to uncover the effect of these parameters on azimuth weighting effectiveness are presented. In particular, it is shown that multilook capabilities of future SAR systems may obviate the need for consideration of the antenna pattern, and that azimuth time-bandwidth products of over 200 are probably required before the digital results begin to approach the ideal results.

Dicenzo, A.

1979-01-01

8

The sum of digits of polynomial values in arithmetic progressions  

E-print Network

Let $q, m\\geq 2$ be integers with $(m,q-1)=1$. Denote by $s_q(n)$ the sum of digits of $n$ in the $q$-ary digital expansion. Further let $p(x)\\in mathbb{Z}[x]$ be a polynomial of degree $h\\geq 3$ with $p(\\mathbb{N})\\subset \\mathbb{N}$. We show that there exist $C=C(q,m,p)>0$ and $N_0=N_0(q,m,p)\\geq 1$, such that for all $g\\in\\mathbb{Z}$ and all $N\\geq N_0$, $$#\\{0\\leq n< N: \\quad s_q(p(n))\\equiv g \\bmod m\\}\\geq C N^{4/(3h+1)}.$$ This is an improvement over the general lower bound given by Dartyge and Tenenbaum (2006), which is $C N^{2/h!}$.

Stoll, Thomas

2011-01-01

9

Energy-weighted sum rules connecting ?Z?=?2 nuclei within the SO(8) model  

SciTech Connect

Energy-weighted sum rules associated with ?Z?=?2 nuclei are obtained for the Fermi and the Gamow-Teller operators within the SO(8) model. It is found that there is a dominance of contribution of a single state of the intermediate nucleus to the sum rule. The results confirm founding obtained within the SO(5) model that the energy-weighted sum rules of ?Z?=?2 nuclei are governed by the residual interactions of nuclear Hamiltonian. A short discussion concerning some aspects of energy weighted sum rules in the case of realistic nuclei is included.

Štefánik, Dušan [Comenius University, Mlynská dolina F1, SK-842 48 Bratislava (Slovenia); Šimkovic, Fedor [IEAP CTU, CZ-128 00 Prague, Czech Republic and BLTP, JINR, 141980 Dubna, Moscow region (Russian Federation); Faessler, Amand [Inst. of Theor. Phys., University of Tuebingen, D-72076 Tuebingen (Germany)

2013-12-30

10

Analog-To-Digital Converter For Sum-Of-Squares Measurements  

NASA Technical Reports Server (NTRS)

Analog-to-digital converter (ADC) circuit designed as part of larger circuit intended to measure root-mean-square current on 20-kHz powerline. Provides digital output of 11 bits of data plus 1-bit overflow signal at sampling rate of 4 MHz. Output processed by multiplying-and-accumulating circuitry to obtain sum of squares and digitized current samples accumulated during preset number of consecutive sampling periods. Used to digitize current samples from ADC directly as alternative or auxiliary output. Notable features include low power and fast conversion.

Osborn, Stephen H.; Davies, Bryan L.; Sullender, Craig C.

1993-01-01

11

How Does Sequence Structure Affect the Judgment of Time? Exploring a Weighted Sum of Segments Model  

ERIC Educational Resources Information Center

This paper examines the judgment of segmented temporal intervals, using short tone sequences as a convenient test case. In four experiments, we investigate how the relative lengths, arrangement, and pitches of the tones in a sequence affect judgments of sequence duration, and ask whether the data can be described by a simple weighted sum of…

Matthews, William J.

2013-01-01

12

Statistical properties of filtered pseudorandom digital sequences formed from the sum of maximum-length sequences  

NASA Technical Reports Server (NTRS)

The statistics of filtered pseudorandom digital sequences called hybrid-sum sequences, formed from the modulo-two sum of several maximum-length sequences, are analyzed. The results indicate that a relation exists between the statistics of the filtered sequence and the characteristic polynomials of the component maximum length sequences. An analysis procedure is developed for identifying a large group of sequences with good statistical properties for applications requiring the generation of analog pseudorandom noise. By use of the analysis approach, the filtering process is approximated by the convolution of the sequence with a sum of unit step functions. A parameter reflecting the overall statistical properties of filtered pseudorandom sequences is derived. This parameter is called the statistical quality factor. A computer algorithm to calculate the statistical quality factor for the filtered sequences is presented, and the results for two examples of sequence combinations are included. The analysis reveals that the statistics of the signals generated with the hybrid-sum generator are potentially superior to the statistics of signals generated with maximum-length generators. Furthermore, fewer calculations are required to evaluate the statistics of a large group of hybrid-sum generators than are required to evaluate the statistics of the same size group of approximately equivalent maximum-length sequences.

Wallace, G. R.; Weathers, G. D.; Graf, E. R.

1973-01-01

13

The application of taylor weighting, digital phase shifters, and digital attenuators to phased-array antennas.  

SciTech Connect

Application of Taylor weighting (taper) to an antenna aperture can achieve low peak sidelobes, but combining the Taylor weighting with quantized attenuators and phase shifters at each radiating element will impact the performance of a phased-array antenna. An examination of array performance is undertaken from the simple point of view of the characteristics of the array factor. Design rules and guidelines for determining the Taylor-weighting parameters, the number of bits required for the digital phase shifter, and the dynamic range and number of bits required for the digital attenuator are developed. For a radar application, when each element is fed directly from a transmit/receive module, the total power radiated by the array will be reduced as a result of the taper. Consequently, the issue of whether to apply the taper on both transmit and receive configurations, or only on the receive configuration is examined with respect to two-way sidelobe performance.

Brock, Billy C.

2008-03-01

14

New Digit-Serial Systolic Arrays for Power-Sum and Division Operation in GF(2m)  

Microsoft Academic Search

\\u000a This paper implements a new digit-serial systolic array for the computation of a power-sum operation and a new digit-serial\\u000a systolic divider using the proposed systolic power-sum array in GF(2\\u000a m\\u000a ) with the standard basis representation. Both of the architectures possess features of regularity, modularity, and unidirectional\\u000a data flow. As a consequence, they have low AT complexity and are well

Won-ho Lee; Keon-jik Lee; Kee-young Yoo

2004-01-01

15

FULL LIST OF REFEREED JOURNAL PUBLICATIONS Tang, Q.; Yuan, Z. Randomly weighted sums of subexponential random variables with  

E-print Network

FULL LIST OF REFEREED JOURNAL PUBLICATIONS Qihe Tang · Tang, Q.; Yuan, Z. Randomly weighted sums.; Tang, Q. Interplay of insurance and financial risks in a discrete-time model with strongly regular variation. Bernoulli (2014), to appear. 83. Cheung, K. C.; Dhaene, J.; Lo, A.; Tang, Q. Reducing risk

Tang, Qihe

16

A characterization of the distribution of a weighted sum of gamma variables through multiple hypergeometric functions  

Microsoft Academic Search

Applying the theory on multiple hypergeometric functions, the distribution of a weighted convolution of gamma variables is characterized through explicit forms for the probability density function, the distribution function and the moments about the origin. The main results unify some previous contributions in the literature on finite convolution of gamma distributions. We deal with computational aspects that arise from the

Francesca Di Salvo

2008-01-01

17

arXiv:0806.1684v3[cond-mat.mes-hall]1Sep2008 f-Sum Rule and Unconventional Spectral Weight Transfer in Graphene  

E-print Network

arXiv:0806.1684v3[cond-mat.mes-hall]1Sep2008 f-Sum Rule and Unconventional Spectral Weight Transfer the spectral weight transfer in graphene within different approximations discussed in the literature. We find in graphene is still unclear. Per- turbative renormalization group (RG) arguments, which are equivalent

18

A GaAs phase digitizing and summing system for microwave signal storage  

NASA Astrophysics Data System (ADS)

The analysis, design, and development of a microwave signal storage prototype system using phase-quantization sampling are described. A GaAs 4-bit D/A converter has been demonstrated in a 3-bit DRFM prototype system with digital Si emitter-coupled logic (ECL) and RF microwave components at a sample rate of 200 MHz and exhibiting typically a -17-dBc harmonic suppression. A monolithic GaAs A/D and D/A converter has been demonstrated within an RF signal acquisition system. Performance data on the monolithic sampler reveal that the 3-bit quantization system exhibits signal reconstruction with harmonic supression exceeding 25 dB across an IF bandwidth of greater than 900 MHz.

Vu, Tho T.; Hattis, James M.

1989-02-01

19

A new IIR-type digital fractional order differentiator  

Microsoft Academic Search

A new IIR (infinite impulse response) type digital fractional order dierentiator (DFOD) is proposed by using a new family of first order digital dierentiators expressed in the second order IIR filter form. The integer first order digital dif- ferentiators are obtained by the stable inversion of the weighted sum of Simpson integration rule and the trapezoidal integration rule. The distinguishing

Yangquan Chen; Blas M. Vinagre

2003-01-01

20

Weighted sum-rate maximization for multi-user SIMO multiple access channels in cognitive radio networks  

NASA Astrophysics Data System (ADS)

In this article, an efficient distributed and parallel algorithm is proposed to maximize the sum-rate and optimize the input distribution policy for the multi-user single input multiple output multiple access channel (MU-SIMO MAC) system with concurrent access within a cognitive radio (CR) network. The single input means that every user has a single antenna and multiple output means that base station(s) has multiple antennas. The main features are: (i) the power distribution for the users is updated by using variable scale factors which effectively and efficiently maximize the objective function at each iteration; (ii) distributed and parallel computation is employed to expedite convergence of the proposed distributed algorithm; and (iii) a novel water-filling with mixed constraints is investigated, and used as a fundamental block of the proposed algorithm. Due to sufficiently exploiting the structure of the proposed model, the proposed algorithm owns fast convergence. Numerical results verify that the proposed algorithm is effective and fast convergent. Using the proposed approach, for the simulated range, the required number of iterations for convergence is two and this number is not sensitive to the increase of the number of users. This feature is quite desirable for large scale systems with dense active users. In addition, it is also worth noting that the proposed algorithm is a monotonic feasible operator to the iteration. Thus, the stop criterion for computation could be easily set up.

He, Peter; Zhao, Lian; Lu, Jianhua

2013-12-01

21

Extension of weighted sum of gray gas data to mathematical simulation of radiative heat transfer in a boiler with gas-soot media.  

PubMed

In this study an expression for soot absorption coefficient is introduced to extend the weighted-sum-of-gray gases data to the furnace medium containing gas-soot mixture in a utility boiler 150 MWe. Heat transfer and temperature distribution of walls and within the furnace space are predicted by zone method technique. Analyses have been done considering both cases of presence and absence of soot particles at 100% load. To validate the proposed soot absorption coefficient, the expression is coupled with the Taylor and Foster's data as well as Truelove's data for CO2-H2O mixture and the total emissivities are calculated and compared with the Truelove's parameters for 3-term and 4-term gray gases plus two soot absorption coefficients. In addition, some experiments were conducted at 100% and 75% loads to measure furnace exit gas temperature as well as the rate of steam production. The predicted results show good agreement with the measured data at the power plant site. PMID:25143981

Gharehkhani, Samira; Nouri-Borujerdi, Ali; Kazi, Salim Newaz; Yarmand, Hooman

2014-01-01

22

Extension of Weighted Sum of Gray Gas Data to Mathematical Simulation of Radiative Heat Transfer in a Boiler with Gas-Soot Media  

PubMed Central

In this study an expression for soot absorption coefficient is introduced to extend the weighted-sum-of-gray gases data to the furnace medium containing gas-soot mixture in a utility boiler 150 MWe. Heat transfer and temperature distribution of walls and within the furnace space are predicted by zone method technique. Analyses have been done considering both cases of presence and absence of soot particles at 100% load. To validate the proposed soot absorption coefficient, the expression is coupled with the Taylor and Foster's data as well as Truelove's data for CO2-H2O mixture and the total emissivities are calculated and compared with the Truelove's parameters for 3-term and 4-term gray gases plus two soot absorption coefficients. In addition, some experiments were conducted at 100% and 75% loads to measure furnace exit gas temperature as well as the rate of steam production. The predicted results show good agreement with the measured data at the power plant site. PMID:25143981

Nouri-Borujerdi, Ali; Kazi, Salim Newaz

2014-01-01

23

Relationship between the spectral line based weighted-sum-of-gray-gases model and the full spectrum k-distribution model  

NASA Astrophysics Data System (ADS)

The relationship between the spectral line based weighted-sum-of-gray-gases (SLW) model and the full-spectrum k-distribution (FSK) model in isothermal and homogeneous media is investigated in this paper. The SLW transfer equation can be derived from the FSK transfer equation expressed in the k-distribution function without approximation. It confirms that the SLW model is equivalent to the FSK model in the k-distribution function form. The numerical implementation of the SLW relies on a somewhat arbitrary discretization of the absorption cross section whereas the FSK model finds the spectrally integrated intensity by integration over the smoothly varying cumulative-k distribution function using a Gaussian quadrature scheme. The latter is therefore in general more efficient as a fewer number of gray gases is required to achieve a prescribed accuracy. Sample numerical calculations were conducted to demonstrate the different efficiency of these two methods. The FSK model is found more accurate than the SLW model in radiation transfer in H2O; however, the SLW model is more accurate in media containing CO2 as the only radiating gas due to its explicit treatment of ‘clear gas.’

Chu, Huaqiang; Liu, Fengshan; Consalvi, Jean-Louis

2014-08-01

24

Design of Digital Filters for Frequency Weightings (A and C) Required for Risk Assessments of Workers Exposed to Noise.  

PubMed

Many workers are exposed to noise in their industrial environment. Excessive noise exposure can cause health problems and therefore it is important that the worker's noise exposure is assessed. This may require measurement by an equipment manufacturer or the employer. Human exposure to noise may be measured using microphones; however, weighting filters are required to correlate the physical noise sound pressure level measurements to the human's response to an auditory stimulus. IEC 61672-1 and ANSI S1.43 describe suitable weighting filters, but do not explain how to implement them for digitally recorded sound pressure level data. By using the bilinear transform, it is possible to transform the analogue equations given in the standards into digital filters. This paper describes the implementation of the weighting filters as digital IIR (Infinite Impulse Response) filters and provides all the necessary formulae to directly calculate the filter coefficients for any sampling frequency. Thus, the filters in the standards can be implemented in any numerical processing software (such as a spreadsheet or programming language running on a PC, mobile device or embedded system). PMID:25224333

Rimell, Andrew N; Mansfield, Neil J; Paddan, Gurmail S

2014-09-13

25

Design of digital filters for frequency weightings (A and C) required for risk assessments of workers exposed to noise  

PubMed Central

Many workers are exposed to noise in their industrial environment. Excessive noise exposure can cause health problems and therefore it is important that the worker’s noise exposure is assessed. This may require measurement by an equipment manufacturer or the employer. Human exposure to noise may be measured using microphones; however, weighting filters are required to correlate the physical noise sound pressure level measurements to the human’s response to an auditory stimulus. IEC 61672-1 and ANSI S1.43 describe suitable weighting filters, but do not explain how to implement them for digitally recorded sound pressure level data. By using the bilinear transform, it is possible to transform the analogue equations given in the standards into digital filters. This paper describes the implementation of the weighting filters as digital IIR (Infinite Impulse Response) filters and provides all the necessary formulae to directly calculate the filter coefficients for any sampling frequency. Thus, the filters in the standards can be implemented in any numerical processing software (such as a spreadsheet or programming language running on a PC, mobile device or embedded system).

RIMELL, Andrew N.; MANSFIELD, Neil J.; PADDAN, Gurmail S.

2014-01-01

26

Integrated-Circuit Active Digital Filter  

NASA Technical Reports Server (NTRS)

Pipeline architecture with parallel multipliers and adders speeds calculation of weighted sums. Picture-element values and partial sums flow through delay-adder modules. After each cycle or time unit of calculation, each value in filter moves one position right. Digital integrated-circuit chips with pipeline architecture rapidly move 35 X 35 two-dimensional convolutions. Need for such circuits in image enhancement, data filtering, correlation, pattern extraction, and synthetic-aperture-radar image processing: all require repeated calculations of weighted sums of values from images or two-dimensional arrays of data.

Nathan, R.

1986-01-01

27

Pedicle digital pad transfer and negative pressure wound therapy for reconstruction of the weight-bearing surface after complete digital loss in a dog.  

PubMed

A young Labrador Retriever was presented for treatment of severe distal hindlimb necrosis caused by bandage ischemia. During digit amputation at the metatarsophalangeal joints, the third and fourth digital pads were salvaged and transferred to the metatarsal stump to create a weight-bearing surface. Negative pressure wound therapy (NPWT) was utilized for flap immobilization and to promote granulation tissue in the remaining wound defect. Sturdy adherence of the digital pads was achieved after only four days. The skin defect healed completely by second intention and the stump was epithelialized with a thin pad after three months. At the nine month follow-up examination, the stump had a thick hyperkeratinized pad. The dog walked and ran without any apparent signs of discomfort and compensated for the loss of limb length by extending the stifle and tarsocrural joints. Despite a challenging wound in a difficult anatomical location, digital pad flap transfer and NPWT proved successful in restoring long-term ambulation in an active large breed dog. PMID:25449188

Or, M; Van Goethem, B; Polis, I; Spillebeen, A; Vandekerckhove, P; Saunders, J; de Rooster, H

2014-12-01

28

Sum Search  

NSDL National Science Digital Library

In this math lesson, learners practice addition facts (with sums of 5, 6, 7, and 8) in a concentration-game format using dominoes. Then, learners generate sums of given numbers using a calculator, record the sums on a hundreds chart and look for patterns. This lesson guide includes questions for learners, assessment options, extensions, and reflection questions.

Burton, Grace M.

2008-01-01

29

Sum Search  

NSDL National Science Digital Library

In this lesson, "students practice addition facts (with sums of 5, 6, 7, and 8) in a concentration-game format using dominoes. Then they generate sums to given numbers using a calculator and record them on a hundreds chart" or use an electronic tool. Next they look for patterns. (from NCTM's Illuminations)

Mathematics, Illuminations N.

2008-12-17

30

Recursion formulas for growing memory digital filters  

Microsoft Academic Search

A growing memory digital filter is defined by considering the input(y_{nu-u})-output(Z_m)relationship in the formZ_m = sum_{u=0}^m W_{um} y_{m-u}, m = 0, 1, 2, cdotswhereW_{um}is the weighting sequence of a linear time varying digital filter. Contained herein are a derivation of an optimum growing memory smoothing and prediction filter in the least squares sense for polynomial input functions, (of degree =K)

M. Blum

1958-01-01

31

Weighty data: importance information influences estimated weight of digital information storage devices  

PubMed Central

Previous work suggests that perceived importance of an object influences estimates of its weight. Specifically, important books were estimated to be heavier than non-important books. However, the experimental set-up of these studies may have suffered from a potential confound and findings may be confined to books only. Addressing this, we investigate the effect of importance on weight estimates by examining whether the importance of information stored on a data storage device (USB-stick or portable hard drive) can alter weight estimates. Results show that people thinking a USB-stick holds important tax information (vs. expired tax information vs. no information) estimate it to be heavier (Experiment 1) compared to people who do not. Similarly, people who are told a portable hard drive holds personally relevant information (vs. irrelevant), also estimate the drive to be heavier (Experiments 2A,B).

Schneider, Iris K.; Parzuchowski, Michal; Wojciszke, Bogdan; Schwarz, Norbert; Koole, Sander L.

2015-01-01

32

Weighty data: importance information influences estimated weight of digital information storage devices.  

PubMed

Previous work suggests that perceived importance of an object influences estimates of its weight. Specifically, important books were estimated to be heavier than non-important books. However, the experimental set-up of these studies may have suffered from a potential confound and findings may be confined to books only. Addressing this, we investigate the effect of importance on weight estimates by examining whether the importance of information stored on a data storage device (USB-stick or portable hard drive) can alter weight estimates. Results show that people thinking a USB-stick holds important tax information (vs. expired tax information vs. no information) estimate it to be heavier (Experiment 1) compared to people who do not. Similarly, people who are told a portable hard drive holds personally relevant information (vs. irrelevant), also estimate the drive to be heavier (Experiments 2A,B). PMID:25620942

Schneider, Iris K; Parzuchowski, Michal; Wojciszke, Bogdan; Schwarz, Norbert; Koole, Sander L

2014-01-01

33

A digital combining-weight estimation algorithm for broadband sources with the array feed compensation system  

NASA Technical Reports Server (NTRS)

An algorithm for estimating the optimum combining weights for the Ka-band (33.7-GHz) array feed compensation system was developed and analyzed. The input signal is assumed to be broadband radiation of thermal origin, generated by a distant radio source. Currently, seven video converters operating in conjunction with the real-time correlator are used to obtain these weight estimates. The algorithm described here requires only simple operations that can be implemented on a PC-based combining system, greatly reducing the amount of hardware. Therefore, system reliability and portability will be improved.

Vilnrotter, V. A.; Rodemich, E. R.

1994-01-01

34

Chromatic sums  

Microsoft Academic Search

This is an expository article without proofs. The detailed theory of chromatic sums is explained in five papers in the Canadian\\u000a Journal of Mathematics ([6]). Here we abbreviate the title of each of these as \\

W. Tutte

35

Angle Sums  

NSDL National Science Digital Library

"Examine the angles in a triangle, quadrilateral, pentagon, hexagon, heptagon or octagon and find a relationship between the number of sides and the sum of the interior angles." (Source: 2000-2012 National Council of Teachers of Mathematics)

Mathematics, Illuminations N.

2010-05-20

36

Multiple (inverse) binomial sums of arbitrary weight and depth and the all-order epsilon-expansion of generalized hypergeometric functions with one half-integer value of parameter  

Microsoft Academic Search

We continue the study of the construction of analytical coefficients of the\\u000aepsilon-expansion of hypergeometric functions and their connection with Feynman\\u000adiagrams. In this paper, we show the following results:\\u000a Theorem A: The multiple (inverse) binomial sums of arbitrary weight and depth\\u000a(see Eq. (1.1)) are expressible in terms of Remiddi-Vermaseren functions.\\u000a Theorem B: The epsilon expansion of a hypergeometric

Mikhail Yu. Kalmykov; Bennie F. L. Ward; Scott A. Yost

2007-01-01

37

Lucky Sums?  

NSDL National Science Digital Library

In this probability game for two students, each player predicts the sum of the two numbers that will be rolled for each of 12 rolls of a pair of dice and then records his/her predictions on the game sheet. Students play the game and the player whose predictions were the most accurate wins. After the game has been played through once, students are given an opportunity to revise their strategy and play again. Creating a table of theoretical probabilities after the first round of play will help student develop their strategies.

2011-01-01

38

Influence of graphical weights' interpretation and filtration algorithms on generalization ability of neural networks applied to digit recognition.  

PubMed

In this paper, the method of the graphical interpretation of the single-layer network weights is introduced. It is shown that the network parameters can be converted to the image and their particular elements are the pixels. For this purpose, weight-to-pixel conversion formula is used. Moreover, new weights' modification method is proposed. The weight coefficients are computed on the basis of pixel values for which image filtration algorithms are implemented. The approach is applied to the weights of three types of the models: single-layer network, two-layer backpropagation network and the hybrid network. The performance of the models is then compared on two independent data sets. By means of the experiments, it is presented that the adjustment of the weights to new values decreases test error value compared to the error obtained for initial set of weights. PMID:22997482

Kusy, Maciej; Szczepanski, Damian

2012-10-01

39

Digital archive of drilling mud weight pressures and wellbore temperatures from 49 regional cross sections of 967 well logs in Louisiana and Texas, onshore Gulf of Mexico basin  

USGS Publications Warehouse

This document provides the digital archive of in-situ temperature and drilling mud weight pressure data that were compiled from several historical sources. The data coverage includes the states of Texas and Louisiana in the Gulf of Mexico basin. Data are also provided graphically, for both Texas and Louisiana, as plots of temperature as a function of depth and pressure as a function of depth. The minimum, arithmetic average, and maximum values are tabulated for each 1,000-foot depth increment for temperature as well as pressure in the Texas and Louisiana data.

Burke, Lauri A.; Kinney, Scott A.; Kola-Kehinde, Temidayo B.

2011-01-01

40

Arithmetic-Progression-Weighted Subsequence Sums  

E-print Network

Let $G$ be an abelian group, let $S$ be a sequence of terms $s_1,s_2,...,s_{n}\\in G$ not all contained in a coset of a proper subgroup of $G$, and let $W$ be a sequence of $n$ consecutive integers. Let

Grynkiewicz, David J; Ponomarenko, Vadim

2011-01-01

41

The Connell Sum Sequence  

NASA Astrophysics Data System (ADS)

The Connell sum sequence refers to the partial sums of the Connell sequence. In this paper, the Connell sequence, Connell sum sequence and generalizations from Iannucci and Mills-Taylor are interpreted as sums of elements of triangles, relating them to polygonal number-stuttered arithmetic progressions. The n-th element of the Connell sum sequence is established as a sharp upper bound for the value of a gamma-labeling of a graph of size n. The limiting behavior and a explicit formula for the Connell (m,r)-sum sequence are also given.

Bullington, Grady D.

2007-01-01

42

Sums of Consecutive Integers  

ERIC Educational Resources Information Center

We begin by answering the question, "Which natural numbers are sums of consecutive integers?" We then go on to explore the set of lengths (numbers of summands) in the decompositions of an integer as such sums.

Pong, Wai Yan

2007-01-01

43

"Teens Talk Healthy Weight": the impact of a motivational digital video disc on parental knowledge of obesity-related diseases in an adolescent clinic.  

PubMed

The purpose of the study was to investigate the impact of a 7-minute educational and motivational weight-management digital video disc (DVD) that uses real patient/parent testimonials and provider-patient interactions, on adolescent and parent knowledge of obesity-related diseases; readiness, motivation, and self-efficacy to lose weight; connectedness to care provider; and likelihood of return to clinic for follow-up care. A randomized controlled trial was conducted among 40 overweight/obese adolescent participants (22.5% male, 77.5% female, mean age=15.43 years) and their parents (n=38) who visited a referral-only adolescent clinic for the first time from October 2009 to March 2010. Adolescents were randomly assigned by a research assistant to standard care alone or standard care plus DVD. Standard care (protocol-driven medical and nutritional assessment and counseling) was provided to all adolescents by a registered dietitian nutritionist and physician or nurse practitioner. Adolescents in the intervention group also viewed the DVD. Adolescents and parents completed assessments pre- and post-clinic visit. Repeated measures analysis of covariance was used to evaluate group differences, while controlling for race/ethnicity and age. Parents who viewed the DVD experienced greater improvements in obesity-related disease knowledge than parents who did not view the DVD. Adolescents in both groups improved on measures of motivation to lose weight and dieting self-efficacy, based on pre and post-test questionnaires. A 7-minute educational and motivational DVD helped improve parent knowledge, but was not more powerful than standard care alone in changing other weight-related outcomes in this adolescent clinic. Because it led to increased parental knowledge, incorporating the DVD into clinical practice could also allow more time for health providers to focus on specific obesity-related treatment/education. Future research might examine whether the DVD has more utility in different settings, such as primary care. PMID:24882205

Windham, Meghan E; Hastings, Elisabeth S; Anding, Roberta; Hergenroeder, Albert C; Escobar-Chaves, Soledad Liliana; Wiemann, Constance M

2014-10-01

44

Sum-Difference Numbers  

ERIC Educational Resources Information Center

Starting with an interesting number game sometimes used by school teachers to demonstrate the factorization of integers, "sum-difference numbers" are defined. A positive integer n is a "sum-difference number" if there exist positive integers "x, y, w, z" such that n = xy = wz and x ? y = w + z. This paper characterizes all sum-difference numbers…

Shi, Yixun

2010-01-01

45

Adjustment of measurements with multiplicative errors: error analysis, estimates of the variance of unit weight, and effect on volume estimation from LiDAR-type digital elevation models.  

PubMed

Modern observation technology has verified that measurement errors can be proportional to the true values of measurements such as GPS, VLBI baselines and LiDAR. Observational models of this type are called multiplicative error models. This paper is to extend the work of Xu and Shimada published in 2000 on multiplicative error models to analytical error analysis of quantities of practical interest and estimates of the variance of unit weight. We analytically derive the variance-covariance matrices of the three least squares (LS) adjustments, the adjusted measurements and the corrections of measurements in multiplicative error models. For quality evaluation, we construct five estimators for the variance of unit weight in association of the three LS adjustment methods. Although LiDAR measurements are contaminated with multiplicative random errors, LiDAR-based digital elevation models (DEM) have been constructed as if they were of additive random errors. We will simulate a model landslide, which is assumed to be surveyed with LiDAR, and investigate the effect of LiDAR-type multiplicative error measurements on DEM construction and its effect on the estimate of landslide mass volume from the constructed DEM. PMID:24434880

Shi, Yun; Xu, Peiliang; Peng, Junhuan; Shi, Chuang; Liu, Jingnan

2013-01-01

46

Adjustment of Measurements with Multiplicative Errors: Error Analysis, Estimates of the Variance of Unit Weight, and Effect on Volume Estimation from LiDAR-Type Digital Elevation Models  

PubMed Central

Modern observation technology has verified that measurement errors can be proportional to the true values of measurements such as GPS, VLBI baselines and LiDAR. Observational models of this type are called multiplicative error models. This paper is to extend the work of Xu and Shimada published in 2000 on multiplicative error models to analytical error analysis of quantities of practical interest and estimates of the variance of unit weight. We analytically derive the variance-covariance matrices of the three least squares (LS) adjustments, the adjusted measurements and the corrections of measurements in multiplicative error models. For quality evaluation, we construct five estimators for the variance of unit weight in association of the three LS adjustment methods. Although LiDAR measurements are contaminated with multiplicative random errors, LiDAR-based digital elevation models (DEM) have been constructed as if they were of additive random errors. We will simulate a model landslide, which is assumed to be surveyed with LiDAR, and investigate the effect of LiDAR-type multiplicative error measurements on DEM construction and its effect on the estimate of landslide mass volume from the constructed DEM. PMID:24434880

Shi, Yun; Xu, Peiliang; Peng, Junhuan; Shi, Chuang; Liu, Jingnan

2014-01-01

47

On Tractable Exponential Sums  

NASA Astrophysics Data System (ADS)

We consider the problem of evaluating certain exponential sums. These sums take the form sum_{x_1,x_2, ldots, x_n in {Z}_N } e^{2 ? i/N {f(x_1,x_2, ldots, x_n)} }, where each x i is summed over a ring ? N , and f(x 1, x 2,..., x n ) is a multivariate polynomial with integer coefficients. We show that the sum can be evaluated in polynomial time in n and logN when f is a quadratic polynomial. This is true even when the factorization of N is unknown. Previously, this was known for a prime modulus N. On the other hand, for very specific families of polynomials of degree ? 3 we show the problem is #P-hard, even for any fixed prime or prime power modulus. This leads to a complexity dichotomy theorem - a complete classification of each problem to be either computable in polynomial time or #P-hard - for a class of exponential sums. These sums arise in the classifications of graph homomorphisms and some other counting CSP type problems, and these results lead to complexity dichotomy theorems. For the polynomial-time algorithm, Gauss sums form the basic building blocks; for the hardness result we prove group-theoretic necessary conditions for tractability.

Cai, Jin-Yi; Chen, Xi; Lipton, Richard; Lu, Pinyan

48

Fungible Weights in Multiple Regression  

ERIC Educational Resources Information Center

Every set of alternate weights (i.e., nonleast squares weights) in a multiple regression analysis with three or more predictors is associated with an infinite class of weights. All members of a given class can be deemed "fungible" because they yield identical "SSE" (sum of squared errors) and R[superscript 2] values. Equations for generating…

Waller, Niels G.

2008-01-01

49

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--II: ANALOG AND DIGITAL SIGNAL PROCESSING, VOL. 46, NO. 8, AUGUST 1999 1035 An Improved Weighted Least-Squares Design  

E-print Network

-squares design for variable-fractional-delay finite-impulse response filters, which offers improved performance in seismic data processing, digital telecommunications, and modeling of music instruments have been reported on the design of finite- impulse response (FIR) VDF's with variable fractional delay. Digital filters

Lu, Wu-Sheng

50

Summing free unitary random matrices.  

PubMed

I use quaternion free probability calculus--an extension of free probability to non-Hermitian matrices (which is introduced in a succinct but self-contained way)--to derive in the large-size limit the mean densities of the eigenvalues and singular values of sums of independent unitary random matrices, weighted by complex numbers. In the case of circular unitary ensemble summands, I write them in terms of two "master equations," which I then solve and numerically test in four specific cases. I conjecture a finite-size extension of these results, exploiting the complementary error function. I prove a central limit theorem, and its first subleading correction, for independent identically distributed zero-drift unitary random matrices. PMID:21867151

Jarosz, Andrzej

2011-07-01

51

Iterated binomial sums and their associated iterated integrals  

NASA Astrophysics Data System (ADS)

We consider finite iterated generalized harmonic sums weighted by the binomial binom{2k}{k} in numerators and denominators. A large class of these functions emerges in the calculation of massive Feynman diagrams with local operator insertions starting at 3-loop order in the coupling constant and extends the classes of the nested harmonic, generalized harmonic, and cyclotomic sums. The binomially weighted sums are associated by the Mellin transform to iterated integrals over square-root valued alphabets. The values of the sums for N ? ? and the iterated integrals at x = 1 lead to new constants, extending the set of special numbers given by the multiple zeta values, the cyclotomic zeta values and special constants which emerge in the limit N ? ? of generalized harmonic sums. We develop algorithms to obtain the Mellin representations of these sums in a systematic way. They are of importance for the derivation of the asymptotic expansion of these sums and their analytic continuation to N in {C}. The associated convolution relations are derived for real parameters and can therefore be used in a wider context, as, e.g., for multi-scale processes. We also derive algorithms to transform iterated integrals over root-valued alphabets into binomial sums. Using generating functions we study a few aspects of infinite (inverse) binomial sums.

Ablinger, J.; Blümlein, J.; Raab, C. G.; Schneider, C.

2014-11-01

52

SUMS calibration test report  

NASA Technical Reports Server (NTRS)

Calibration was performed on the shuttle upper atmosphere mass spectrometer (SUMS). The results of the calibration and the as run test procedures are presented. The output data is described, and engineering data conversion factors, tables and curves, and calibration on instrument gauges are included. Static calibration results which include: instrument sensitive versus external pressure for N2 and O2, data from each scan of calibration, data plots from N2 and O2, and sensitivity of SUMS at inlet for N2 and O2, and ratios of 14/28 for nitrogen and 16/32 for oxygen are given.

Robertson, G.

1982-01-01

53

PDA+: A Personal Digital Assistant for Obesity Treatment - An RCT testing the use of technology to enhance weight loss treatment for veterans  

Microsoft Academic Search

Background  Obese adults struggle to make the changes necessary to achieve even modest weight loss, though a decrease in weight by as\\u000a little as 10% can have significant health benefits. Failure to meet weight loss goals may in part be associated with barriers\\u000a to obesity treatment. Wide-spread dissemination of evidence-based obesity treatment faces multiple challenges including cost,\\u000a access, and implementing the

Jennifer M Duncan; E Amy Janke; Andrea T Kozak; Megan Roehrig; Stephanie W Russell; H Gene McFadden; Andrew Demott; Alex Pictor; Don Hedeker; Bonnie Spring

2011-01-01

54

Number Cube Sums  

NSDL National Science Digital Library

In this calculator activity students complete an experiment on the frequency of sums by rolling two dice fifty times and recording their data. Students record their data in a table using tallies, fractions, decimals, and percent form. Individual data is then compiled into a class chart to identify patterns in data when more trials are conducted. This activity is designed to be completed using the TI-15 Explorer calculator. A PDF of the lesson plan and student sheet is included.

2008-06-09

55

SumAll  

NSDL National Science Digital Library

Interested in learning about your social media reach? You may want to check out SumAll which is a rather nice way to do just that. After signing up for the free version, visitors will receive a daily digest of their social media influence on over a dozen platforms, including LinkedIn, Twitter, Google+ and others. It's a powerful tool that is compatible with all operating systems.

2014-02-13

56

Sums of Infinite Series  

NSDL National Science Digital Library

The spiral is a curve traced by moving either outward or inward about a fixed point called the pole. A Baravelle Spiral is generated by connecting the midpoints of the successive sides of a regular polygon. Triangles will be formed. The process of identifying and repeatedly connecting the midpoints is called iteration. Mathematically, the Baravelle Spiral is a geometric illustration of a concept basic to the Calculus: The sum of an infinite geometric series - an unbounded set of numbers where each term is related by a common ratio, or multiplier, of "r" - converges to a finite number called a limit when 0 < r < 1. Much time in the Calculus curriculum, and its applications in the sciences, focuses on whether a particular mathematical expression has a limit and thus be highly useful. Historically, one of our oldest mathematical documents, the Rhind Papyrus (ca. 1650 BC), offers a set of data thought to represent a geometric series and possibly an understanding of the formula for finding its sum. In this case, the common ratio of r = 7 is obviously NOT less than 1 and leads to 71+72 +73 + 74 + 75 = 19,607. While not a converging series, as in the case of Baravelle Spirals, we appreciate the early Egyptian fascination with sums of series.

Lai, Robert

2006-01-01

57

Counting Triangles to Sum Squares  

ERIC Educational Resources Information Center

Counting complete subgraphs of three vertices in complete graphs, yields combinatorial arguments for identities for sums of squares of integers, odd integers, even integers and sums of the triangular numbers.

DeMaio, Joe

2012-01-01

58

Using Squares to Sum Squares  

ERIC Educational Resources Information Center

Purely combinatorial proofs are given for the sum of squares formula, 1[superscript 2] + 2[superscript 2] + ... + n[superscript 2] = n(n + 1) (2n + 1) / 6, and the sum of sums of squares formula, 1[superscript 2] + (1[superscript 2] + 2[superscript 2]) + ... + (1[superscript 2] + 2[superscript 2] + ... + n[superscript 2]) = n(n + 1)[superscript 2]…

DeTemple, Duane

2010-01-01

59

Analytic Continuation of Harmonic Sums  

E-print Network

We present a method for calculating any (nested) harmonic sum to arbitrary accuracy for all complex values of the argument. The method utilizes the relation between harmonic sums and (derivatives of) Hurwitz zeta functions, which allows a harmonic sum to be calculated as an expansion valid for large values of its argument. A program for implementing this method is also provided.

S. Albino

2009-03-06

60

Redundancy of minimal weight expansions in Pisot bases.  

PubMed

Motivated by multiplication algorithms based on redundant number representations, we study representations of an integer n as a sum n=?k?kUk, where the digits ?k are taken from a finite alphabet ? and (Uk)k is a linear recurrent sequence of Pisot type with U0=1. The most prominent example of a base sequence (Uk)k is the sequence of Fibonacci numbers. We prove that the representations of minimal weight ?k|?k| are recognised by a finite automaton and obtain an asymptotic formula for the average number of representations of minimal weight. Furthermore, we relate the maximal number of representations of a given integer to the joint spectral radius of a certain set of matrices. PMID:22163376

Grabner, Peter J; Steiner, Wolfgang

2011-10-21

61

``Robinson's sum rule'' revisited  

NASA Astrophysics Data System (ADS)

This discussion revisits two articles on synchrotron radiation damping published in 1958, one by this author and Evgeny K. Tarasov [Zh. Eksp. Teor. Fiz. 34, 651 (1958)ZETFA70044-4510; Sov. Phys. JETP 34, 449 (1958)SPHJAR0038-5646], and one by Kenneth W. Robinson [Phys. Rev. 111, 373 (1958)PHRVAO0031-899X10.1103/PhysRev.111.373]. The latter is the source of what is known as “Robinson’s sum rule.” Both present the familiar rule, but with very different proofs and calculations of concrete damping decrements. Comparative analysis of these differences reveals serious flaws in Robinson’s proof and calculations.

Orlov, Yuri F.

2010-02-01

62

A 2-categorical state sum model  

NASA Astrophysics Data System (ADS)

It has long been argued that higher categories provide the proper algebraic structure underlying state sum invariants of 4-manifolds. This idea has been refined recently, by proposing to use 2-groups and their representations as specific examples of 2-categories. The challenge has been to make these proposals fully explicit. Here, we give a concrete realization of this program. Building upon our earlier work with Baez and Wise on the representation theory of 2-groups, we construct a four-dimensional state sum model based on a categorified version of the Euclidean group. We define and explicitly compute the simplex weights, which may be viewed a categorified analogue of Racah-Wigner 6j-symbols. These weights solve a hexagon equation that encodes the formal invariance of the state sum under the Pachner moves of the triangulation. This result unravels the combinatorial formulation of the Feynman amplitudes of quantum field theory on flat spacetime proposed in A. Baratin and L. Freidel [Classical Quantum Gravity 24, 2027-2060 (2007)] which was shown to lead after gauge-fixing to Korepanov's invariant of 4-manifolds.

Baratin, Aristide; Freidel, Laurent

2015-01-01

63

An efficient method for evaluating energy-dependent sum rules  

E-print Network

Energy-dependent sum rules are useful tools in many fields of physics. In nuclear physics, they typically involve an integration of the response function over the nuclear spectrum with a weight function composed of integer powers of the energy. More complicated weight functions are also encountered, e.g., in nuclear polarization corrections of atomic spectra. Using the Lorentz integral transform method and the Lanczos algorithm, we derive a computationally efficient technique for evaluating such sum rules that avoids the explicit calculation of both the continuum states and the response function itself. Our numerical results for electric dipole sum rules of the Helium-4 nucleus with various energy-dependent weights show rapid convergence with respect to the number of Lanczos steps. This demonstrates the usefulness of the method in a variety of electroweak reactions.

Nir Nevo Dinur; Chen Ji; Sonia Bacca; Nir Barnea

2014-03-29

64

On Character Sums and Exponential Sums over Generalized Arithmetic Progressions  

E-print Network

We study upper bounds for sums of Dirichlet characters. We prove a uniform upper bound of the character sum over all proper generalized arithmetic progressions, which generalizes the classical Polya and Vinogradov inequality. Our argument is based on getting an upper bound for the l1 norm of the Fourier coefficients of a generalized arithmetic progression. Our method also applies to give upper bounds for polynomial exponential sums.

Shao, Xuancheng

2012-01-01

65

Analytic and algorithmic aspects of generalized harmonic sums and polylogarithms  

SciTech Connect

In recent three-loop calculations of massive Feynman integrals within Quantum Chromodynamics (QCD) and, e.g., in recent combinatorial problems the so-called generalized harmonic sums (in short S-sums) arise. They are characterized by rational (or real) numerator weights also different from ±1. In this article we explore the algorithmic and analytic properties of these sums systematically. We work out the Mellin and inverse Mellin transform which connects the sums under consideration with the associated Poincaré iterated integrals, also called generalized harmonic polylogarithms. In this regard, we obtain explicit analytic continuations by means of asymptotic expansions of the S-sums which started to occur frequently in current QCD calculations. In addition, we derive algebraic and structural relations, like differentiation with respect to the external summation index and different multi-argument relations, for the compactification of S-sum expressions. Finally, we calculate algebraic relations for infinite S-sums, or equivalently for generalized harmonic polylogarithms evaluated at special values. The corresponding algorithms and relations are encoded in the computer algebra package HarmonicSums.

Ablinger, Jakob; Schneider, Carsten [Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Altenbergerstraße 69, A-4040, Linz (Austria)] [Research Institute for Symbolic Computation (RISC), Johannes Kepler University, Altenbergerstraße 69, A-4040, Linz (Austria); Blümlein, Johannes [Deutsches Elektronen–Synchrotron, DESY, Platanenallee 6, D-15738 Zeuthen (Germany)] [Deutsches Elektronen–Synchrotron, DESY, Platanenallee 6, D-15738 Zeuthen (Germany)

2013-08-15

66

Analytic and algorithmic aspects of generalized harmonic sums and polylogarithms  

NASA Astrophysics Data System (ADS)

In recent three-loop calculations of massive Feynman integrals within Quantum Chromodynamics (QCD) and, e.g., in recent combinatorial problems the so-called generalized harmonic sums (in short S-sums) arise. They are characterized by rational (or real) numerator weights also different from ±1. In this article we explore the algorithmic and analytic properties of these sums systematically. We work out the Mellin and inverse Mellin transform which connects the sums under consideration with the associated Poincaré iterated integrals, also called generalized harmonic polylogarithms. In this regard, we obtain explicit analytic continuations by means of asymptotic expansions of the S-sums which started to occur frequently in current QCD calculations. In addition, we derive algebraic and structural relations, like differentiation with respect to the external summation index and different multi-argument relations, for the compactification of S-sum expressions. Finally, we calculate algebraic relations for infinite S-sums, or equivalently for generalized harmonic polylogarithms evaluated at special values. The corresponding algorithms and relations are encoded in the computer algebra package HarmonicSums

Ablinger, Jakob; Blümlein, Johannes; Schneider, Carsten

2013-08-01

67

Locating the Extrema of Fungible Regression Weights  

ERIC Educational Resources Information Center

In a multiple regression analysis with three or more predictors, every set of alternate weights belongs to an infinite class of "fungible weights" (Waller, Psychometrica, "in press") that yields identical "SSE" (sum of squared errors) and R[superscript 2] values. When the R[superscript 2] using the alternate weights is a fixed value, fungible…

Waller, Niels G.; Jones, Jeff A.

2009-01-01

68

Recurrence Formulas for Fibonacci Sums  

E-print Network

In this article we present a new recurrence formula for a finite sum involving the Fibonacci sequence. Furthermore, we state an algorithm to compute the sum of a power series related to Fibonacci series, without the use of term-by-term differentiation theorem

Adilson J. V. Brandao; Joao L. Martins

2008-05-18

69

Digitized synchronous demodulator  

NASA Technical Reports Server (NTRS)

A digitized synchronous demodulator is constructed entirely of digital components including timing logic, an accumulator, and means to digitally filter the digital output signal. Indirectly, it accepts, at its input, periodic analog signals which are converted to digital signals by traditional analog-to-digital conversion techniques. Broadly, the input digital signals are summed to one of two registers within an accumulator, based on the phase of the input signal and medicated by timing logic. At the end of a predetermined number of cycles of the inputted periodic signals, the contents of the register that accumulated samples from the negative half cycle is subtracted from the accumulated samples from the positive half cycle. The resulting difference is an accurate measurement of the narrow band amplitude of the periodic input signal during the measurement period. This measurement will not include error sources encountered in prior art synchronous demodulators using analog techniques such as offsets, charge injection errors, temperature drift, switching transients, settling time, analog to digital converter missing code, and linearity errors.

Woodhouse, Christopher E. (inventor)

1990-01-01

70

NIST: Weights and Measures  

NSDL National Science Digital Library

Weights and measures may not be the first thing that most people wake up in the morning thinking about, but such matters are terribly important. The National Institute of Standards and Technology (NIST) has created this site to provide information to concerned stakeholders about the work of their Office of Weights and Measures. The mission of the Office is to promote "uniformity in U.S. weights and measures laws, regulations, and standards to achieve equity between buyers and sellers in the marketplaces." On the right hand side of the page, visitors can look over a Resources area. Here they will find educational materials, information on the National Conference on Weights and Measures, past newsletters, and a rather fine digital exhibit that traces "the struggle to achieve weights and measures standardization" in the United States. On the left-hand side of the page, visitors can learn more about price verification, packaging and labeling, and the metric system.

2012-05-18

71

Weight set  

NSDL National Science Digital Library

Your skin covers and protects your body. Your skin can also detect pressure and weight. You can tell that a one gram weight feels lighter than a one kilogram weight because the receptors on your skin detect more pressure from a one kilogram weight compared to a one gram weight.

N/A N/A (None; )

2005-12-11

72

On the Hardness of Subset Sum Problem from Different Intervals  

NASA Astrophysics Data System (ADS)

The subset sum problem, which is often called as the knapsack problem, is known as an NP-hard problem, and there are several cryptosystems based on the problem. Assuming an oracle for shortest vector problem of lattice, the low-density attack algorithm by Lagarias and Odlyzko and its variants solve the subset sum problem efficiently, when the “density” of the given problem is smaller than some threshold. When we define the density in the context of knapsack-type cryptosystems, weights are usually assumed to be chosen uniformly at random from the same interval. In this paper, we focus on general subset sum problems, where this assumption may not hold. We assume that weights are chosen from different intervals, and make analysis of the effect on the success probability of above algorithms both theoretically and experimentally. Possible application of our result in the context of knapsack cryptosystems is the security analysis when we reduce the data size of public keys.

Kogure, Jun; Kunihiro, Noboru; Yamamoto, Hirosuke

73

Generalized constructive tree weights  

SciTech Connect

The Loop Vertex Expansion (LVE) is a quantum field theory (QFT) method which explicitly computes the Borel sum of Feynman perturbation series. This LVE relies in a crucial way on symmetric tree weights which define a measure on the set of spanning trees of any connected graph. In this paper we generalize this method by defining new tree weights. They depend on the choice of a partition of a set of vertices of the graph, and when the partition is non-trivial, they are no longer symmetric under permutation of vertices. Nevertheless we prove they have the required positivity property to lead to a convergent LVE; in fact we formulate this positivity property precisely for the first time. Our generalized tree weights are inspired by the Brydges-Battle-Federbush work on cluster expansions and could be particularly suited to the computation of connected functions in QFT. Several concrete examples are explicitly given.

Rivasseau, Vincent, E-mail: vincent.rivasseau@th.u-psud.fr, E-mail: adrian.tanasa@ens-lyon.org [LPT, CNRS UMR 8627, Univ. Paris 11, 91405 Orsay Cedex, France and Perimeter Institute for Theoretical Physics, 31 Caroline St. N, Ontario N2L 2Y5, Waterloo (Canada)] [LPT, CNRS UMR 8627, Univ. Paris 11, 91405 Orsay Cedex, France and Perimeter Institute for Theoretical Physics, 31 Caroline St. N, Ontario N2L 2Y5, Waterloo (Canada); Tanasa, Adrian, E-mail: vincent.rivasseau@th.u-psud.fr, E-mail: adrian.tanasa@ens-lyon.org [Université Paris 13, Sorbonne Paris Cité, 99, Avenue Jean-Baptiste Clément LIPN, Institut Galilée, CNRS UMR 7030, F-93430 Villetaneuse, France and Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O.B. MG-6, 077125 Magurele (Romania)] [Université Paris 13, Sorbonne Paris Cité, 99, Avenue Jean-Baptiste Clément LIPN, Institut Galilée, CNRS UMR 7030, F-93430 Villetaneuse, France and Horia Hulubei National Institute for Physics and Nuclear Engineering, P.O.B. MG-6, 077125 Magurele (Romania)

2014-04-15

74

Local Limit Theorems for Sums of Finite Range Potentials of a Gibbsian Random Field  

Microsoft Academic Search

Local limit theorems are derived for sums of finite range $\\\\mathbb{Z}$-valued potential functions of an iid random field. The resulting approximations turn out to be mixtures of standard normal densities for lattice distributions supported by residue classes of integers. The mixing weights are equal to the probability that the sum of potential functions lies in such a residue class and

F. Gotze; C. Hipp

1990-01-01

75

SUMS preliminary design and data analysis development. [shuttle upper atmosphere mass spectrometer experiment  

NASA Technical Reports Server (NTRS)

The preliminary analysis and data analysis system development for the shuttle upper atmosphere mass spectrometer (SUMS) experiment are discussed. The SUMS experiment is designed to provide free stream atmospheric density, pressure, temperature, and mean molecular weight for the high altitude, high Mach number region.

Hinson, E. W.

1981-01-01

76

Complex-energy approach to sum rules within nuclear density functional theory  

E-print Network

The linear response of the nucleus to an external field contains unique information about the effective interaction, correlations, and properties of its excited states. To characterize the response, it is useful to use its energy-weighted moments, or sum rules. By comparing computed sum rules with experimental values, the information content of the response can be utilized in the optimization process of the nuclear Hamiltonian or EDF. But the additional information comes at a price: compared to the ground state, computation of excited states is more demanding. To establish an efficient framework to compute sum rules of the response that is adaptable to the optimization of the nuclear EDF and large-scale surveys of collective strength, we have developed a new technique within the complex-energy FAM based on the QRPA. To compute sum rules, we carry out contour integration of the response function in the complex-energy plane. We benchmark our results against the conventional matrix formulation of the QRPA theory, the Thouless theorem for the energy-weighted sum rule, and the dielectric theorem for the inverse energy-weighted sum rule. We demonstrate that calculated sum-rule values agree with those obtained from the matrix formulation of the QRPA. We also discuss the applicability of both the Thouless theorem about the energy-weighted sum rule and the dielectric theorem for the inverse energy-weighted sum rule to nuclear density functional theory in cases when the EDF is not based on a Hamiltonian. The proposed sum-rule technique based on the complex-energy FAM is a tool of choice when optimizing effective interactions or energy functionals. The method is very efficient and well-adaptable to parallel computing. The FAM formulation is especially useful when standard theorems based on commutation relations involving the nuclear Hamiltonian and external field cannot be used.

Nobuo Hinohara; Markus Kortelainen; Witold Nazarewicz; Erik Olsen

2015-01-28

77

Some properties of extremal solutions of zero-sum differential games  

NASA Technical Reports Server (NTRS)

Necessary conditions for infinite-time linear-quadratic two-player differential games with perfect state information are examined in the light of Willems' work on the algebraic Riccati equation. Necessary conditions for the nonzero-sum game do not always reduce precisely to those of the zero-sum game, when the weighting parameters of the cost index are taken as those of a zero-sum game. Formulation of zero-sum game problems in extended L2-spaces reveals the existence of nonstabilizing but infimal controls, and explicit frequency-domain conditions for existence of solutions and stabilizing solutions are established through the algebraic Riccati equation (ARE).

Johnson, T. L.

1975-01-01

78

Optical sum rule in multiband superconductors  

NASA Astrophysics Data System (ADS)

In the standard Bardeen-Cooper-Schrieffer model, the optical sum rule establishes the relation between the superfluid density and the change in the integral of the real part of the conductivity over the frequency after the transition to the superconducting state. In conventional low-temperature superconductors, these two values become equal if the conductivity is integrated up to a frequency of the order of several widths of the superconducting gap. Optical experiments for high- T c cuprate superconductors performed by many research groups over the world demonstrate that the integration up to a much higher frequency (of the order of the band width) is needed to reproduce the spectral weight of the superfluid component. An interpretation of these experiments has been proposed with allowance for the complex crystal structure of cuprates, in which several orbitals of different symmetries approach the Fermi level.

Arseev, P. I.; Loiko, S. O.; Fedorov, N. K.

2014-12-01

79

Precision digital pulse phase generator  

DOEpatents

A timing generator comprises a crystal oscillator connected to provide an output reference pulse. A resistor-capacitor combination is connected to provide a variable-delay output pulse from an input connected to the crystal oscillator. A phase monitor is connected to provide duty-cycle representations of the reference and variable-delay output pulse phase. An operational amplifier drives a control voltage to the resistor-capacitor combination according to currents integrated from the phase monitor and injected into summing junctions. A digital-to-analog converter injects a control current into the summing junctions according to an input digital control code. A servo equilibrium results that provides a phase delay of the variable-delay output pulse to the output reference pulse that linearly depends on the input digital control code.

McEwan, Thomas E. (Livermore, CA)

1996-01-01

80

Precision digital pulse phase generator  

DOEpatents

A timing generator comprises a crystal oscillator connected to provide an output reference pulse. A resistor-capacitor combination is connected to provide a variable-delay output pulse from an input connected to the crystal oscillator. A phase monitor is connected to provide duty-cycle representations of the reference and variable-delay output pulse phase. An operational amplifier drives a control voltage to the resistor-capacitor combination according to currents integrated from the phase monitor and injected into summing junctions. A digital-to-analog converter injects a control current into the summing junctions according to an input digital control code. A servo equilibrium results that provides a phase delay of the variable-delay output pulse to the output reference pulse that linearly depends on the input digital control code. 2 figs.

McEwan, T.E.

1996-10-08

81

Digital Libraries.  

ERIC Educational Resources Information Center

Provides an overview of digital libraries research, practice, and literature. Highlights include new technologies; redefining roles; historical background; trends; creating digital content, including conversion; metadata; organizing digital resources; services; access; information retrieval; searching; natural language processing; visualization;…

Fox, Edward A.; Urs, Shalini R.

2002-01-01

82

Digital Image Compression  

Microsoft Academic Search

Nondeterministic finite automata with states and transitions labeled by real-valued weights have turned out to be powerful\\u000a tools for the representation and compression of digital grayscale and color images. The addressing of pixels by input-sequences\\u000a is extended to cover multi-resolution images. Encoding algorithms for such weighted finite automata (WFA) exploit self-similarities\\u000a for efficient image compression, outperforming the well-known JPEG baseline

Jürgen Albert; Jarkko Kari

2009-01-01

83

Progressions and Sums Putnam Practice  

E-print Network

Progressions and Sums Putnam Practice October 6, 2004 An arithmetic progression is a sequence progression. 6. Show that if a, b, c are positive numbers such that a2, b2, c2 are in arithmetic progression, then 1 b + c , 1 c + a , 1 a + b are in arithmetic progression. 2 #12;

Albert, John

84

Direct Sum Decomposition of Groups  

ERIC Educational Resources Information Center

Direct sum decomposition of Abelian groups appears in almost all textbooks on algebra for undergraduate students. This concept plays an important role in group theory. One simple example of this decomposition is obtained by using the kernel and range of a projection map on an Abelian group. The aim in this pedagogical note is to establish a direct…

Thaheem, A. B.

2005-01-01

85

Summing Certain p-Series.  

ERIC Educational Resources Information Center

Presents an exercise suitable for beginning calculus students that may give insight into series representations and allow students to see some elementary application of these representations. The Fourier series is used to approximate by taking sums of trigonometric functions of the form sin(ns) and cos(nx) for n is greater than or = zero. (PVD)

Fay, Temple H.

1997-01-01

86

Path integrals as discrete sums  

SciTech Connect

We present a new formulation of Feynman's path integral, based on Voronin's theorems on the universality of the Riemann zeta function. The result is a discrete sum over paths,'' each given by a zeta function. A new measure which leads to the correct quantum mechanics is explicitly given.

Bitar, K.; Khuri, N.N.; Ren, H.C. (Supercomputer Computations Research Institute, Florida State University, Tallahasee, Florida (USA) Department of Physics, The Rockefeller University, New York, New York (USA))

1991-08-12

87

Indefinite hypergeometric sums in MACSYMA  

NASA Technical Reports Server (NTRS)

A MACSYMA function is presented which, given the command a sub n = delta g(n) = g(n+1)-g(n), finds g(n), the indefinite sum, within an additive constant, provided that g(n+1)/g(n) is a rational function of n.

Gosper, R. W., Jr.

1977-01-01

88

Weight Control  

MedlinePLUS

Keeping a healthy weight is crucial. If you are underweight, overweight, or obese, you may have a higher risk of certain health problems. ... U.S. are overweight or obese. Achieving a healthy weight can help you control your cholesterol, blood pressure ...

89

An efficient sampling technique for sums of bandpass functions  

NASA Technical Reports Server (NTRS)

A well known sampling theorem states that a bandlimited function can be completely determined by its values at a uniformly placed set of points whose density is at least twice the highest frequency component of the function (Nyquist rate). A less familiar but important sampling theorem states that a bandlimited narrowband function can be completely determined by its values at a properly chosen, nonuniformly placed set of points whose density is at least twice the passband width. This allows for efficient digital demodulation of narrowband signals, which are common in sonar, radar and radio interferometry, without the side effect of signal group delay from an analog demodulator. This theorem was extended by developing a technique which allows a finite sum of bandlimited narrowband functions to be determined by its values at a properly chosen, nonuniformly placed set of points whose density can be made arbitrarily close to the sum of the passband widths.

Lawton, W. M.

1982-01-01

90

Summing Planar Bosonic Open Strings  

SciTech Connect

In earlier work, planar graphs of massless {phi}{sup 3} theory were summed with the help of the light cone world sheet picture and the mean field approximation. In the present article, the same methods are applied to the problem of summing planar bosonic open strings. They find that in the ground state of the system, string boundaries form a condensate on the world sheet, and a new string emerges from this summation. Its slope is always greater than the initial slope, and it remains non-zero even when the initial slope is set equal to zero. If they assume the initial string tends to a field a theory in the zero slope limit, this result provides evidence for string formation in field theory.

Bardakci, Korkut

2006-02-16

91

Repeated Reasoning: Products and Sums  

NSDL National Science Digital Library

This professional development video clip of students engaged in Common Core Practice Standard #8—Look for and express regularity in repeated reasoning shows a classroom of fourth grade students exploring the relationships between sums and products of numbers when numbers are added to themselves and when they are multiplied by each other. The sum and product of each number is displayed sequentially in an array on grid paper to detect patterns more readily. Additional resources include a video transcript, teaching tips, and a link to a professional development reflection activity based upon the video. A related clip (cataloged separately) shows the same exploration by the same students but Common Core Practice Standard # 7-Look for and make use of structures is evident.

WGHB Boston

2013-01-01

92

Broadband performance of superdirective delay-and-sum beamformers steered to end-fire.  

PubMed

Linear arrays steered to end-fire provide superdirective robust performance if a constraint is imposed on the white-noise gain. Filter-and-sum beamformers achieve the maximum constrained directivity by tuning their complex weights over the frequency. Delay-and-sum beamformers have simpler structures, but their weights are fixed and optimized at a given frequency. This letter investigates the constrained directivity provided over a broad band by different delay-and-sum techniques. Complex weights and analytic signals attain near-optimal broadband performance over four octaves. Oversteered arrays using real weights and signals were found to attain superdirective performance over approximately two octaves. Hearing aids and directional hydrophones are potential applications for the considered arrays. PMID:24907842

Trucco, A; Traverso, F; Crocco, M

2014-06-01

93

Torque-Summing Brushless Motor  

NASA Technical Reports Server (NTRS)

Torque channels function cooperatively but electrically independent for reliability. Brushless, electronically-commutated dc motor sums electromagnetic torques on four channels and applies them to single shaft. Motor operates with any combination of channels and continues if one or more of channels fail electrically. Motor employs single stator and rotor and mechanically simple; however, each of channels electrically isolated from other so that failure of one does not adversely affect others.

Vaidya, J. G.

1986-01-01

94

Regression weights as a function of test length  

Microsoft Academic Search

A battery of pencil-and-paper tests is commonly used for predicting a single criterion. If the score on each test is the number of correct answers, the composite battery score would normally be the sum of the weighted test scores, where the weights are the raw score regression weights. Knowing the reliability of each test, it is possible to alter the

Paul Horst

1948-01-01

95

Weight simulator  

NASA Technical Reports Server (NTRS)

Device applies compressive force to bone to minimize loss of bone calcium during weightlessness or bedrest. Force is applied through weights, or hydraulic, pneumatic or electrically actuated devices. Device is lightweight and easy to maintain and operate.

Howard, W. H.; Young, D. R.

1972-01-01

96

SDMA with a Sum Feedback Rate Constraint  

Microsoft Academic Search

Space division multiple access (SDMA) is capable of achieving sum capacity that grows double logarithmically with the number of users. The sum rate for channel state information (CSI) feedback, however, increases linearly with the number of users, reducing the effective uplink capacity. To address this problem, a novel SDMA design is proposed, where the sum feedback rate is upper-bounded by

K. Huang; Robert W. Heath; Jeffrey G. Andrews

2007-01-01

97

Digital single-sideband mixer.  

NASA Technical Reports Server (NTRS)

Description of a simple single-sideband (SSB) mixer design that yields either a sum-frequency output with the difference-frequency output suppressed or vice-versa, and uses only 'digital' logic devices and no reactive or frequency-selective 'analog' (linear) circuit elements. A pair of outputs is generated in phase quadrature. It is shown that SSB frequency conversion can be accomplished for many applications much more efficiently with simple digital circuitry than in the usual way with complicated linear frequency selective filter and phasing circuits.

Counselman, C. C., III; Hinteregger, H. F.

1973-01-01

98

Digital orthophotos  

USGS Publications Warehouse

A digital orthophoto is a digital image of an aerial photograph with displacements caused by the camera angle and the terrain removed. It, thus, combines the image characteristics of a photograph with the geometric qualities of a map.

U.S. Geological Survey

1993-01-01

99

Digital redaction  

E-print Network

of a more powerful information infrastructure is being undertaken in the NSF/DARPA/NASA Joint Digital Library initiative, other digital library research projects and a number of other venues [21]. Dilferent layers of protocol will be used to gain...

Coquelin, Valerie

1997-01-01

100

Rao-Blackwellization for Adaptive Gaussian Sum Nonlinear Model Propagation  

NASA Technical Reports Server (NTRS)

When dealing with imperfect data and general models of dynamic systems, the best estimate is always sought in the presence of uncertainty or unknown parameters. In many cases, as the first attempt, the Extended Kalman filter (EKF) provides sufficient solutions to handling issues arising from nonlinear and non-Gaussian estimation problems. But these issues may lead unacceptable performance and even divergence. In order to accurately capture the nonlinearities of most real-world dynamic systems, advanced filtering methods have been created to reduce filter divergence while enhancing performance. Approaches, such as Gaussian sum filtering, grid based Bayesian methods and particle filters are well-known examples of advanced methods used to represent and recursively reproduce an approximation to the state probability density function (pdf). Some of these filtering methods were conceptually developed years before their widespread uses were realized. Advanced nonlinear filtering methods currently benefit from the computing advancements in computational speeds, memory, and parallel processing. Grid based methods, multiple-model approaches and Gaussian sum filtering are numerical solutions that take advantage of different state coordinates or multiple-model methods that reduced the amount of approximations used. Choosing an efficient grid is very difficult for multi-dimensional state spaces, and oftentimes expensive computations must be done at each point. For the original Gaussian sum filter, a weighted sum of Gaussian density functions approximates the pdf but suffers at the update step for the individual component weight selections. In order to improve upon the original Gaussian sum filter, Ref. [2] introduces a weight update approach at the filter propagation stage instead of the measurement update stage. This weight update is performed by minimizing the integral square difference between the true forecast pdf and its Gaussian sum approximation. By adaptively updating each component weight during the nonlinear propagation stage an approximation of the true pdf can be successfully reconstructed. Particle filtering (PF) methods have gained popularity recently for solving nonlinear estimation problems due to their straightforward approach and the processing capabilities mentioned above. The basic concept behind PF is to represent any pdf as a set of random samples. As the number of samples increases, they will theoretically converge to the exact, equivalent representation of the desired pdf. When the estimated qth moment is needed, the samples are used for its construction allowing further analysis of the pdf characteristics. However, filter performance deteriorates as the dimension of the state vector increases. To overcome this problem Ref. [5] applies a marginalization technique for PF methods, decreasing complexity of the system to one linear and another nonlinear state estimation problem. The marginalization theory was originally developed by Rao and Blackwell independently. According to Ref. [6] it improves any given estimator under every convex loss function. The improvement comes from calculating a conditional expected value, often involving integrating out a supportive statistic. In other words, Rao-Blackwellization allows for smaller but separate computations to be carried out while reaching the main objective of the estimator. In the case of improving an estimator's variance, any supporting statistic can be removed and its variance determined. Next, any other information that dependents on the supporting statistic is found along with its respective variance. A new approach is developed here by utilizing the strengths of the adaptive Gaussian sum propagation in Ref. [2] and a marginalization approach used for PF methods found in Ref. [7]. In the following sections a modified filtering approach is presented based on a special state-space model within nonlinear systems to reduce the dimensionality of the optimization problem in Ref. [2]. First, the adaptive Gaussian sum propagation is explained and then the new marginali

Semper, Sean R.; Crassidis, John L.; George, Jemin; Mukherjee, Siddharth; Singla, Puneet

2015-01-01

101

The Gerasimov-Drell-Hearn Sum Rule  

E-print Network

In the confinement regime at Q^2=0 the Gerasimov-Drell-Hearn (GDH) Sum Rule connects static properties of the nucleon with the difference of spin dependent doubly polarized total absorption cross sections of real photons. Now, for the first time this fundamental sum rule is verified by the GDH-Collaboration with circularly polarized real photons and longitudinally polarized nucleons at the two accelerators ELSA and MAMI. The integral (sum) of the GDH Sum Rule can be generalized to the case of virtual photons. This allows to establish a Q^2 dependency and to study the transition to the perturbative regime of QCD. Ultimately, the GDH Sum Rule can be related to the Bjorken and the Ellis-Jaffe Sum Rule. This contribution covers the status of theory concerning the GDH Sum Rule as well as the experimental approaches and their results for the absorption of real and virtual photons. We point out that the so-called No-Subtraction hypothesis, often considered the weakest part of the derivation of the GDH Sum Rule, in fact follows from unitarity and does not impair the fundamental character of the GDH Sum Rule. The shown experimental data verify the GDH Sum Rule for the proton at the level of 8% including the systematic uncertainties from extrapolations to unmeasured energy regions. For the GDH Sum Rule on the neutron and the isovector case we find unexpected contributions at photon energies above 1 GeV.

Klaus Helbing

2006-03-22

102

Digital Citizenship  

ERIC Educational Resources Information Center

Era in which we live is known and referred as digital age.In this age technology is rapidly changed and developed. In light of these technological advances in 21st century, schools have the responsibility of training "digital citizen" as well as a good citizen. Digital citizens must have extensive skills, knowledge, Internet and …

Isman, Aytekin; Canan Gungoren, Ozlem

2014-01-01

103

Semiring Artificial Neural Networks and Weighted Automata  

E-print Network

Semiring Artificial Neural Networks and Weighted Automata And an Application to Digital Image neural networks and weighted automata. For this task, we introduce semiring artificial neural networks, that is, artificial neural networks which implement the addition and the multiplication of semirings. We

Hoelldobler, Steffen

104

Weight Management  

Microsoft Academic Search

The incidence of obesity has soared in recent years, as has the availability of online health information targeting this problem. This article identifies reliable Internet resources for health information about weight management for the overweight and obese. These sources have been evaluated as being useful for both consumers and health care professionals. The reviewed Web sites fall into three categories:

Lin Wu

2006-01-01

105

Digital optical spark chambers  

SciTech Connect

The authors have constructed and tested a prototype digital readout system for optical spark chambers using a linear, solid state (CCD) detector array. Position resolution of 0.013 mm (sigma) over a 25 centimeter field of view has been demonstrated. This technique should permit the construction of economical, light weight and low power trajectory hodoscopes for use in cosmic ray instrumentation on balloons and in spacecraft.

Evenson, P.; Tuska, E.

1989-02-01

106

Measuring food intake with digital photography.  

PubMed

The digital photography of foods method accurately estimates the food intake of adults and children in cafeterias. When using this method, images of food selection and leftovers are quickly captured in the cafeteria. These images are later compared with images of 'standard' portions of food using computer software. The amount of food selected and discarded is estimated based upon this comparison, and the application automatically calculates energy and nutrient intake. In the present review, we describe this method, as well as a related method called the Remote Food Photography Method (RFPM), which relies on smartphones to estimate food intake in near real-time in free-living conditions. When using the RFPM, participants capture images of food selection and leftovers using a smartphone and these images are wirelessly transmitted in near real-time to a server for analysis. Because data are transferred and analysed in near real-time, the RFPM provides a platform for participants to quickly receive feedback about their food intake behaviour and to receive dietary recommendations for achieving weight loss and health promotion goals. The reliability and validity of measuring food intake with the RFPM in adults and children is also reviewed. In sum, the body of research reviewed demonstrates that digital imaging accurately estimates food intake in many environments and it has many advantages over other methods, including reduced participant burden, elimination of the need for participants to estimate portion size, and the incorporation of computer automation to improve the accuracy, efficiency and cost-effectiveness of the method. PMID:23848588

Martin, C K; Nicklas, T; Gunturk, B; Correa, J B; Allen, H R; Champagne, C

2014-01-01

107

Two novel methods in QCD sum rules  

SciTech Connect

Two novel methods in extracting the spectral information of hadrons in the QCD sum rule technique. The first one is to combine two sum rules so that the pole dominance is achieved and the resonance information is effectively obtained. This method is applied to the pentaquark {Theta}{sup +} and its quantum numbers are predicted. The second method is to use the Bayesian inference theory to obtain the most probable form of the spectral function from the sum rule. We have checked the method to work in the case of the rho meson sum rule.

Gubler, Philipp; Oka, Makoto [Dept. of Physics, H-27, Tokyo Institute of Technology, Meguro, Tokyo 152-8551 (Japan)

2010-12-28

108

The transverse angular momentum sum rule  

E-print Network

We explain the origin of the controversy about the existence of a transverse angular momentum sum rule, and show that it stems from utilizing an incorrect result in the literature, concerning the expression for the expectation values of the angular momentum operators. We demonstrate a new, short and direct way of obtaining correct expressions for these expectation values, from which a perfectly good transverse angular momentum sum rule can be deduced. We also introduce a new classification of sum rules into primary and secondary types. In the former all terms occurring in the sum rule can be measured experimentally; in the latter some terms cannot be measured experimentally.

Elliot Leader

2008-06-30

109

Digital metamaterials  

NASA Astrophysics Data System (ADS)

Balancing complexity and simplicity has played an important role in the development of many fields in science and engineering. One of the well-known and powerful examples of such balance can be found in Boolean algebra and its impact on the birth of digital electronics and the digital information age. The simplicity of using only two numbers, ‘0’ and ‘1’, in a binary system for describing an arbitrary quantity made the fields of digital electronics and digital signal processing powerful and ubiquitous. Here, inspired by the binary concept, we propose to develop the notion of digital metamaterials. Specifically, we investigate how one can synthesize an electromagnetic metamaterial with a desired permittivity, using as building blocks only two elemental materials, which we call ‘metamaterial bits’, with two distinct permittivity functions. We demonstrate, analytically and numerically, how proper spatial mixtures of such metamaterial bits lead to elemental ‘metamaterial bytes’ with effective material parameters that are different from the parameters of the metamaterial bits. We then apply this methodology to several design examples of optical elements, such as digital convex lenses, flat graded-index digital lenses, digital constructs for epsilon-near-zero (ENZ) supercoupling and digital hyperlenses, thus highlighting the power and simplicity of the methodology.

Della Giovampaola, Cristian; Engheta, Nader

2014-12-01

110

Digital printing  

NASA Astrophysics Data System (ADS)

Digital printing is described as a tool to replace conventional printing machines completely. Still this goal was not reached until now with any of the digital printing technologies to be described in the paper. Productivity and costs are still the main parameters and are not really solved until now. Quality in digital printing is no problem anymore. Definition of digital printing is to transfer digital datas directly on the paper surface. This step can be carried out directly or with the use of an intermediate image carrier. Keywords in digital printing are: computer- to-press; erasable image carrier; image carrier with memory. Digital printing is also the logical development of the new digital area as it is pointed out in Nicholas Negropotes book 'Being Digital' and also the answer to networking and Internet technologies. Creating images text and color in one country and publishing the datas in another country or continent is the main advantage. Printing on demand another big advantage and last but not least personalization the last big advantage. Costs and being able to coop with this new world of prepress technology is the biggest disadvantage. Therefore the very optimistic growth rates for the next few years are really nonexistent. The development of complete new markets is too slow and the replacing of old markets is too small.

Sobotka, Werner K.

1997-02-01

111

CATEGORY OF sp (2n)-MODULES WITH BOUNDED WEIGHT MULTIPLICITIES  

E-print Network

is equivalent to the category of weight modules over the Weyl algebra An (see Lemma 3.1 and Corollary 5.3). WeCATEGORY OF sp (2n)-MODULES WITH BOUNDED WEIGHT MULTIPLICITIES DIMITAR GRANTCHAROV AND VERA bounded weight g-modules, i.e. those which are direct sum of their weight spaces and have uniformly

Serganova, Vera

112

Mellin Transforms and Asymptotics: Harmonic Sums  

Microsoft Academic Search

This survey presents a unified and essentially self-contained approach to the asymptotic analysis of a large class of sums that arise in combinatorial mathematics, discrete probabilistic models, and the average-case analysis of algorithms. It relies on the Mellin transform, a close relative of the integral transforms of Laplace and Fourier. The method applies to harmonic sums that are superpositions of

Philippe Flajolet; Xavier Gourdon; Philippe Dumas

1995-01-01

113

Power sums of Fibonacci and Lucas numbers  

Microsoft Academic Search

Polynomial representation formulae for power sums of the extended Fibonacci-Lucas numbers are established, which include, as special cases, four formulae for odd power sums of Melham type on Fibonacci and Lucas numbers, obtained recently by Ozeki and Prodinger (2009).

Wenchang Chu; Nadia N. Li

2011-01-01

114

On Unit Sum Numbers of Rational Groups  

Microsoft Academic Search

The unit sum numbers of rational groups are investigated: the importance of the prime 2 being an automorphism of the rational group is discussed and other results are achieved by considering the number and distribution of rational primes which are, or are not, automorphisms of the group. Proof is given of the existence of rational groups with unit sum numbers

Brendan Goldsmith; C. Meehan; S. L. Wallutis

2002-01-01

115

Item Response Modeling with Sum Scores  

ERIC Educational Resources Information Center

One of the distinctions between classical test theory and item response theory is that the former focuses on sum scores and their relationship to true scores, whereas the latter concerns item responses and their relationship to latent scores. Although item response theory is often viewed as the richer of the two theories, sum scores are still…

Johnson, Timothy R.

2013-01-01

116

On the Telescoping Sum. Classroom Notes  

ERIC Educational Resources Information Center

The telescoping sum constitutes a powerful technique for summing series. In this note, this technique is illustrated by a series of problems starting off with some simple ones in arithmetic, then some in trigonometry, famous families of numbers, Apery-like formulas, and finally ending with a class of problems that are solved by computer.

Chen, Hongwei

2004-01-01

117

Kostant's weight multiplicity formula and the Fibonacci numbers  

E-print Network

It is well known that the dimension of a weight space for a finite dimensional representation of a simple Lie algebra is given by Kostant's weight multiplicity formula. We address the question of how many terms in the alternation contribute to the multiplicity of the zero weight for certain, very special, highest weights. Specifically, we consider the case where the highest weight is equal to the sum of all simple roots. This weight is dominant only in Lie types $A$ and $B$. We prove that in all such cases the number of contributing terms is a Fibonacci number. Combinatorial consequences of this fact are provided.

Harris, Pamela

2011-01-01

118

On the General Dedekind Sums and Two-Term Exponential Sums  

PubMed Central

We use the analytic methods and the properties of Gauss sums to study the computational problem of one kind hybrid mean value involving the general Dedekind sums and the two-term exponential sums, and give an interesting computational formula for it. PMID:25374933

Zhang, Junli

2014-01-01

119

Long arithmetic progressions in sum-sets and the number of x-sum-free sets  

E-print Network

Long arithmetic progressions in sum-sets and the number of x-sum-free sets E. Szemer´edi V. H. Vu. 1 Introduction In this paper, we study the existence of long arithmetic progressions in sum different) elements of A. Finding a long arithmetic progression in lA is a well- known topic in additive

Vu, Van H.

120

40 CFR 91.508 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2011 CFR

...Ci-1 + Xi ? (FEL + F))] Where: Ci = The current CumSum statistic Ci-1 = The previous CumSum statistic. Prior to any testing, the CumSum statistic = 0 (i.e. C0 = 0) Xi = The current emission test result for...

2011-07-01

121

40 CFR 91.508 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2010 CFR

...Ci-1 + Xi ? (FEL + F))] Where: Ci = The current CumSum statistic Ci-1 = The previous CumSum statistic. Prior to any testing, the CumSum statistic = 0 (i.e. C0 = 0) Xi = The current emission test result for...

2010-07-01

122

40 CFR 91.508 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2012 CFR

...Ci-1 + Xi ? (FEL + F))] Where: Ci = The current CumSum statistic Ci-1 = The previous CumSum statistic. Prior to any testing, the CumSum statistic = 0 (i.e. C0 = 0) Xi = The current emission test result for...

2012-07-01

123

40 CFR 91.508 - Cumulative Sum (CumSum) procedure.  

...Ci-1 + Xi ? (FEL + F))] Where: Ci = The current CumSum statistic Ci-1 = The previous CumSum statistic. Prior to any testing, the CumSum statistic = 0 (i.e. C0 = 0) Xi = The current emission test result for...

2014-07-01

124

40 CFR 91.508 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2013 CFR

...Ci-1 + Xi ? (FEL + F))] Where: Ci = The current CumSum statistic Ci-1 = The previous CumSum statistic. Prior to any testing, the CumSum statistic = 0 (i.e. C0 = 0) Xi = The current emission test result for...

2013-07-01

125

Digital TMI  

NASA Technical Reports Server (NTRS)

Presenting the current status of the Digital TMI project to visiting members of the FAA Command Center. Digital TMI is an effort to store national-level traffic management initiatives in a standards-compliant manner. Work is funded by the FAA.

Rios, Joseph

2012-01-01

126

Design of an automatic weight scale for an isolette  

NASA Technical Reports Server (NTRS)

The design of an infant weight scale is reported that fits into an isolette without disturbing its controlled atmosphere. The scale platform uses strain gages to measure electronically deflections of cantilever beams positioned at its four corners. The weight of the infant is proportional to the sum of the output voltages produced by the gauges on each beam of the scale.

Peterka, R. J.; Griffin, W.

1974-01-01

127

Geophysical weight loss diet  

NASA Astrophysics Data System (ADS)

Having for numerous reasons acquired a three digit kilogram mass, the author is experienced at the painful struggles that the gourmand must suffer to reduce weight, particularly if he/she enjoys reasonably large amounts of good food. To the avant-garde geophysicist, utilizing the following approach could be pleasurable, rewarding, and may even enable the accomplishment of what Ghengis Khan, Alexander the Great, Napolean, and Hitler could not!The basic approach is the full utilization of Newton's formula for the attraction of two massive bodies: F=GM1M2/r2, where G, is the gravitational constant; r, the distance between the two bodies; and M1 and M2, the masses of the two bodies. Although one usually chooses M1 to be the earth's mass ME and M2 to be the mass of a small object, this unnecessarily restricts the realm of phenomena. The less restrictive assumption is M1 + M2 = ME.

Schatten, Kenneth

1984-04-01

128

Exact sum rules for inhomogeneous strings  

SciTech Connect

We derive explicit expressions for the sum rules of the eigenvalues of inhomogeneous strings with arbitrary density and with different boundary conditions. We show that the sum rule of order N may be obtained in terms of a diagrammatic expansion, with (N?1)!/2 independent diagrams. These sum rules are used to derive upper and lower bounds to the energy of the fundamental mode of an inhomogeneous string; we also show that it is possible to improve these approximations taking into account the asymptotic behavior of the spectrum and applying the Shanks transformation to the sequence of approximations obtained to the different orders. We discuss three applications of these results. -- Highlights: •We derive an explicit expression for the sum rules of an inhomogeneous string. •We obtain a diagrammatic representation for the sum rules of a given order. •We obtain precise bounds on the lowest eigenvalue of the string.

Amore, Paolo, E-mail: paolo.amore@gmail.com

2013-11-15

129

Digital Archaeology  

NSDL National Science Digital Library

What exactly is digital archaeology? It's the documentation of the "formative years of digital culture" and it all happens right here on this site. Digital Archaeology was unveiled in London as part of Internet Week Europe 2010, bringing together a selection of sites to promote the concept of digital preservation. The main focus here is "Error 404," an exhibition that celebrates the golden age of the website, complete with profiles of classic sites on the "hardware and software of their day." The homepage features such articles as "Digital Revolution at the Barbican" and "The Secret History of WiFi.' Visitors can also check out the latest tweets and of course the "Error 404" exhibition itself. The Archives and Tags sections provide another fun way to explore the site.

130

The Gerasimov Drell Hearn sum rule  

NASA Astrophysics Data System (ADS)

? Sum rules measurements involving the spin structure of the nucleon like those due to Bjorken, Ellis and Jaffe and the one due to Gerasimov, Drell and Hearn allow us to study the structure of strong interactions. At long distance scales in the confinement regime the Gerasimov-Drell-Hearn (GDH) sum rule (Eq. (1)) connects static properties of the nucleon-like the anomalous magnetic moment and the nucleon mass-with the difference of spin dependent doubly polarized total absorption cross sections of real photons. Hence, the full spin-dependent excitation spectrum of the nucleon is being related to its static properties. The sum rule has not been investigated experimentally until recently. Now, for the first time this fundamental sum rule is verified by the GDH-Collaboration with circularly polarized real photons and longitudinally polarized nucleons at the two accelerators ELSA and MAMI. The investigation of the response of the proton as well as of the neutron allows us to perform an isospin decomposition. Further investigations with real photons are scheduled at SLAC, JLAB, SPRING-8, LEGS and GRAAL. The integral (sum) of the GDH sum rule can be generalized to the case of virtual photons. This allows us to establish a Q2 dependency and to study the transition to the perturbative regime of QCD. Ultimately, the GDH sum rule can be related to the Bjorken and the Ellis-Jaffe sum rule. This transition is the subject of several experiments e.g. at JLAB for the resonance region and of the HERMES experiment at DESY for higher Q2. This contribution covers the status of theory concerning the GDH sum rule as well as the experimental approaches and their results for the absorption of real and virtual photons. We point out that the so-called No-Subtraction hypothesis, often considered the weakest part of the derivation of the GDH sum rule, in fact follows from unitarity and does not impair the fundamental character of the GDH sum rule. The experimental data verify the GDH sum rule for the proton at the level of 8% including the systematic uncertainties from extrapolations to unmeasured energy regions. For the GDH sum rule on the neutron and the isovector case we find unexpected contributions at photon energies above 1 GeV.

Helbing, Klaus

2006-10-01

131

SRM is formulated: Daily average discharge (Qn+1) is the sum of  

E-print Network

runoff coefficient (cR) · Discharge on the preceding day (Qn) weightedMethods SRM is formulated: Daily average discharge (Qn+1) is the sum to the total basin area and the snowmelt runoff coefficient (cS) · Precipita>on (P

132

Digital echocardiography.  

PubMed

Continued improvement in the computer price-to-performance ratio and the adoption of international standards have enhanced the feasibility of completely digital echocardiographic laboratories that were initially described more than a decade ago. Digital archival has distinct advantages over analog recording, including improved laboratory efficiency, capability of side-by-side comparison of current and historical studies, streamlined image storage, and enhanced interinstitution image transfer. Studies have demonstrated that clinical and electronic image compression allows efficient storage of data, without affecting diagnostic accuracy. Finally, digital echocardiography has important telemedicine applications. PMID:9822872

Main, M L; Thomas, J D

1998-11-01

133

Digital Pulse  

NSDL National Science Digital Library

When high technology crashes into popular culture you've got Digital Pulse, the heartbeat of the infotainment infobahn with exclusive news and tips from the experts at CMP's Windows Magazine, NetGuide, Home PC and more. This week read about Adam Curry's deal with BMI which will let him sell (and us buy) digital recordings over the 'Net. Free registration is required on Pathfinder, Time Warner's home on the internet.

134

Digital Epidemiology  

PubMed Central

Mobile, social, real-time: the ongoing revolution in the way people communicate has given rise to a new kind of epidemiology. Digital data sources, when harnessed appropriately, can provide local and timely information about disease and health dynamics in populations around the world. The rapid, unprecedented increase in the availability of relevant data from various digital sources creates considerable technical and computational challenges. PMID:22844241

Salathé, Marcel; Bengtsson, Linus; Bodnar, Todd J.; Brewer, Devon D.; Brownstein, John S.; Buckee, Caroline; Campbell, Ellsworth M.; Cattuto, Ciro; Khandelwal, Shashank; Mabry, Patricia L.; Vespignani, Alessandro

2012-01-01

135

Digital Light Projector  

NSDL National Science Digital Library

This is a Quicktime animation of a Digital Light Projector. A digital light projector provides the capability to display a video or computer monitor signal on a projection screen. Such a projector stands out by its small size, low weight and rather unique use of MEMS. The internal light path starts with a bright halogen source, which is guided through the color wheel, reflects off the MEMS chip and is projected through the projector lens. A close-up of the color wheel and MEMS chip reveals the internal lens and beamsplitter. The micromirror chip is mounted in a package with a transparent window onto the printed circuit board. An even closer view shows the active element: a large array of little mirrors. Millions of these mirrors, each smaller than 20 micron, are packed onto the micromirror chip.

Van Zeghbroeck, Bart J.

2012-09-05

136

Sum rules for an inhomogeneous electron gas  

Microsoft Academic Search

The well known sum rules for the density-density correlation function of a homogeneous charged Fermi system are extended to arbitrary inhomogeneous systems. The result is applied to a metallic half-space.

D. Wagner

1975-01-01

137

On sums of tensor and fusion multiplicities  

NASA Astrophysics Data System (ADS)

The total multiplicity in the decomposition into irreducibles of the tensor product ?? of two irreducible representations of a simple Lie algebra is invariant under conjugation of one of them: \\sum _\

Coquereaux, Robert; Zuber, Jean-Bernard

2011-07-01

138

Privacy Preserving k Secure Sum Protocol  

Microsoft Academic Search

Secure Multiparty Computation (SMC) allows parties to know the result of\\u000acooperative computation while preserving privacy of individual data. Secure sum\\u000acomputation is an important application of SMC. In our proposed protocols\\u000aparties are allowed to compute the sum while keeping their individual data\\u000asecret with increased computation complexity for hacking individual data. In\\u000athis paper the data of individual

Rashid Sheikh; Beerendra Kumar; Durgesh Kumar Mishra

2009-01-01

139

A quarter century with conjugacy class sums  

NASA Astrophysics Data System (ADS)

Recent progress in the study of the refined class-sum products in the group-algebra of the symmetric group is reported. Quasi-commutativity and non-associativity of these products are established, sum-rules are presented, and recurrence relations are recalled. Special cases in which evaluation of the refined structure constants is feasible are classified, emphasizing that a generally applicable effective procedure is still lacking.

Katriel, Jacob

2015-01-01

140

7 CFR 42.132 - Determining cumulative sum values.  

Code of Federal Regulations, 2010 CFR

...CONTAINERS On-Line Sampling and Inspection Procedures...on-line cumulative sum sampling plans for AQL's applicable...the CuSum value to the acceptance limit (“L”) if the CuSum value exceeds the acceptance limit...

2010-01-01

141

17 CFR 201.600 - Interest on sums disgorged.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 false Interest on sums disgorged. 201.600 Section 201...Penalty Payments § 201.600 Interest on sums disgorged. (a) Interest required. Prejudgment interest shall be due on any sum required to be paid pursuant to...

2010-04-01

142

Real time pipelined system for forming the sum of products in the processing of video data  

NASA Technical Reports Server (NTRS)

A 3-by-3 convolver utilizes 9 binary arithmetic units connected in cascade for multiplying 12-bit binary pixel values P sub i which are positive or two's complement binary numbers by 5-bit magnitide (plus sign) weights W sub i which may be positive or negative. The weights are stored in registers including the sign bits. For a negative weight, the one's complement of the pixel value to be multiplied is formed at each unit by a bank of 17 exclusive or gates G sub i under control of the sign of the corresponding weight W sub i, and a correction is made by adding the sum of the absolute values of all the negative weights for each 3-by-3 kernel. Since this correction value remains constant as long as the weights are constant, it can be precomputed and stored in a register as a value to be added to the product PW of the first arithmetic unit.

Wilcox, Brian (inventor)

1988-01-01

143

Support activities to maintain SUMS flight readiness  

NASA Technical Reports Server (NTRS)

The Shuttle Upper Atmosphere Mass Spectrometer (SUMS), a component experiment of the NASA Orbital Experiments Program (OEX), was flown aboard the shuttle Columbia (OV102) mounted at the forward end of the nose landing gear well with an atmospheric gas inlet system fitted to the lower fuselage (chin panel) surface. The SUMS was designed to provide atmospheric data in flow regimes inaccessible prior to the development of the Space Transportation System (STS). The experiment mission operation began about one hour prior to shuttle de-orbit entry maneuver and continued until reaching 1.6 torr (about 86 km altitude). The SUMS mass spectrometer consists of the spare unit from the Viking mission to Mars. Bendix Aerospace under contract to NASA LaRC incorporated the Viking mass spectrometer, a microprocessor based logic card, a pressurized instrument case, and the University of Texas at Dallas provided a gas inlet system into a configuration suited to interface with the shuttle Columbia. The SUMS experiment underwent static and dynamic calibration as well as vacuum maintenance before and after STS 40 shuttle flight. The SUMS flew a total of 3 times on the space shuttle Columbia. Between flights the SUMS was maintained in flight ready status. The flight data has been analyzed by the NASA LaRC Aerothermodynamics Branch. Flight data spectrum plots and reports are presented in the Appendices to the Final Technical Report for NAS1-17399.

Wright, Willie

1992-01-01

144

Programmable Digital Controller  

NASA Technical Reports Server (NTRS)

An existing three-channel analog servo loop controller has been redesigned for piezoelectric-transducer-based (PZT-based) etalon control applications to a digital servo loop controller. This change offers several improvements over the previous analog controller, including software control over proportional-integral-derivative (PID) parameters, inclusion of other data of interest such as temperature and pressure in the control laws, improved ability to compensate for PZT hysteresis and mechanical mount fluctuations, ability to provide pre-programmed scanning and stepping routines, improved user interface, expanded data acquisition, and reduced size, weight, and power.

Wassick, Gregory J.

2012-01-01

145

Decay constants of heavy-light vector mesons from QCD sum rules  

NASA Astrophysics Data System (ADS)

We revisit QCD sum rules for the decay constants of heavy-light mesons. In the sum rules for the vector mesons B(s)* and D(s)* we improve the accuracy of OPE, taking into account the O(?s2) terms in the perturbative part and calculating the O(?s) corrections to the quark-condensate contribution. With this accuracy, we obtain the ratios of decay constants: fB*/fB=1.02-0.03+0.07, fD*/fD=1.20-0.07+0.10. The sum rule predictions for the decay constants of pseudoscalar mesons are updated with the results fB=(207-9+17)MeV, fBs=(242-12+17)MeV, fD=(201-13+12)MeV, fDs=(238-23+13)MeV. In order to assess the sensitivity of our calculation to the form of the sum rule, we consider alternative versions such as the power moments and Borel sum rules with different weights of the spectral density. We also investigated the heavy-quark limit of the sum rules for vector and pseudoscalar mesons, estimating the violations of the heavy-quark spin and flavor symmetry.

Gelhausen, P.; Khodjamirian, A.; Pivovarov, A. A.; Rosenthal, D.

2013-07-01

146

Weight Loss Surgery  

MedlinePLUS

Weight loss surgery helps people with extreme obesity to lose weight. It may be an option if you cannot lose weight ... obesity. There are different types of weight loss surgery. They often limit the amount of food you ...

147

BODY WEIGHT AND COGNITIVE DECLINE IN MCI  

E-print Network

determined by the evaluating ADNI clinician, Table 2. The event indicator in these models was coded as a clinically significantly worsening of the ADAS-Cog, MMSE, and the CDR Sum of Boxes. We observed a protective effect of BMI in reducing the risk...: ______________ 2 The Thesis Committee for Benjamin B. Cronk certifies that this is the approved Version of the following thesis: BODY WEIGHT AND COGNITIVE DECLINE IN MCI ____________________ Chairperson: Won Choi Ph...

Cronk, Ben B.

2008-08-08

148

Digital Divide  

NSDL National Science Digital Library

PBS viewers can preview this upcoming two-part series through the accompanying Website of the same name. The Digital Divide examines the digital revolution and how the spread of computer technology is affecting young people in the United States. The Website is arranged into four main sections: Classrooms, Gender, Race, and At Work. In each section, there is an interactive lesson on the issue (Interact), interviews with experts (Voices), and list of annotated Internet resources on the issue (Links). The first part of the Digital Divide will air nationally on PBS stations on January 28, 2000. A note to users: as the site uses a dark background with colored text, some text, including URLs listed in white, will not print from some browsers without making necessary adjustments to settings or preferences.

149

Heavy cycles and spanning trees with few leaves in weighted graphs  

Microsoft Academic Search

Let G be a 2-connected weighted graph and k?2 an integer. In this note we prove that if the sum of the weighted degrees of every k+1 pairwise nonadjacent vertices is at least m, then G contains either a cycle of weight at least 2m\\/(k+1) or a spanning tree with no more than k leaves.

Binlong Li; Shenggui Zhang

2011-01-01

150

Digital Logic  

NSDL National Science Digital Library

For electrical or computer engineering students or anyone with a passing interest, this site presents a very good overview of digital logic. The basics of both combinational and sequential logic are discussed, and the design of specific components such as counters and shift registers are also illustrated. A particularly interesting section is devoted to the inner workings of logic gates, which is important to fully understand digital design. This looks beyond the gate level into the transistors and other basic elements. Even though the material is very informative overall, one possible downside to this site is that some of the circuit diagrams are a little too closely spaced.

Bigelow, Ken.

151

Supersymmetric Yukawa sum rule and LHC tests  

SciTech Connect

We propose the ''supersymmetric (SUSY) Yukawa sum rule,'' a relationship between physical masses and mixing angles of the third-generation quarks and squarks. The sum rule follows directly from a relation between quark and squark couplings to the Higgs, enforced by SUSY. It is exactly this relation that ensures the cancellation of the one-loop quadratic divergence in the Higgs mass from the top sector. Testing the sum rule experimentally would thus provide a powerful consistency check on SUSY as the solution to the gauge hierarchy problem. While such a test will most likely have to await a future next-generation lepton collider, the LHC experiments may be able to make significant progress towards this goal. If some of the terms entering the sum rule are measured at the LHC, the sum rule can be used (within SUSY framework) to put interesting constraints on the other terms, such as the mixing angles among third-generation squarks. We outline how the required mass measurements could be performed, and estimate the accuracy that can be achieved at the LHC.

Blanke, Monika; Curtin, David; Perelstein, Maxim [Laboratory for Elementary Particle Physics, Cornell University, Ithaca, New York 14850 (United States)

2010-08-01

152

Randomly stopped sums: models and psychological applications  

PubMed Central

This paper describes an approach to modeling the sums of a continuous random variable over a number of measurement occasions when the number of occasions also is a random variable. A typical example is summing the amounts of time spent attending to pieces of information in an information search task leading to a decision to obtain the total time taken to decide. Although there is a large literature on randomly stopped sums in financial statistics, it is largely absent from psychology. The paper begins with the standard modeling approaches used in financial statistics, and then extends them in two ways. First, the randomly stopped sums are modeled as “life distributions” such as the gamma or log-normal distribution. A simulation study investigates Type I error rate accuracy and power for gamma and log-normal versions of this model. Second, a Bayesian hierarchical approach is used for constructing an appropriate general linear model of the sums. Model diagnostics are discussed, and three illustrations are presented from real datasets. PMID:25426090

Smithson, Michael; Shou, Yiyun

2014-01-01

153

Weighted principal component analysis: a weighted covariance eigendecomposition approach  

NASA Astrophysics Data System (ADS)

We present a new straightforward principal component analysis (PCA) method based on the diagonalization of the weighted variance-covariance matrix through two spectral decomposition methods: power iteration and Rayleigh quotient iteration. This method allows one to retrieve a given number of orthogonal principal components amongst the most meaningful ones for the case of problems with weighted and/or missing data. Principal coefficients are then retrieved by fitting principal components to the data while providing the final decomposition. Tests performed on real and simulated cases show that our method is optimal in the identification of the most significant patterns within data sets. We illustrate the usefulness of this method by assessing its quality on the extrapolation of Sloan Digital Sky Survey quasar spectra from measured wavelengths to shorter and longer wavelengths. Our new algorithm also benefits from a fast and flexible implementation.

Delchambre, L.

2015-02-01

154

Wideband digital filter using FPGAs  

NASA Astrophysics Data System (ADS)

A digital filter being developed by the National Radio Astronomy Observatory (NRAO) for the Atacama Large Millimeter Array (ALMA) is presented here. The filter is designed using field programmable gate array (FPGA) integrated circuits and has an equivalent clock rate of 4 GHz. The ALMA radio astronomy array being developed by the NRAO in cooperation with several European scientific agencies will consist of up to 64 twelve-meter diameter antennas to be used for observing astronomical sources at millimeter and submillimeter wavelengths. This instrument is to observe with bandwidths up to 16 GHz per antenna in eight unbroken RF bands of 2 GHz each. Bandwidth-resolution trade-offs are done in ALMA by providing each of the eight 4-Gsample/s digitizers per antenna with a programmable Finite Impulse Response (FIR) digital filter. The filter can be selected to perform 1/1, 1/2, 1/4, . . ., 1/64 band filtering and sample decimation. In the 1/2 band mode, the filter has the equivalent of 128 tap weight multiplications. Tap weights increase by factors of two to the limit of 2048 tap weights when the filter is programmed to be a 1/32 band low-pass or high-pass filter. The filter is designed to process the output of a four-bit digitizer. The filter utilizes RAM look-up tables for tap weight multiplications. The output of the tap weight multiplications drive an adder tree which has 10-bit precision in the early stages and 7-bit precision in latter stages. Output quantizing of the adder tree output is done in look-up table RAM to 2- bit, 4-level precision. The filter is implemented on a 280-mm, 6-U, Euro card using FPGA ICs running with a system clock rate of 125 MHz.

Escoffier, Raymond P.; Webber, John C.; D'Addario, Larry R.; Broadwell, Charles M.

2000-07-01

155

Diquarks: A QCD sum rule perspective  

SciTech Connect

We propose a phenomenological QCD sum rule with an explicit diquark field to investigate the essential ingredients inside the hadrons. By introducing the mass m{sub {phi}} and the condensate <{phi}{sup 2}> for the diquark field as parameters in the model, we find that the sum rule works well for {Lambda}, {Lambda}{sub c}, and {Lambda}{sub b}. This implies that these {Lambda} baryons can be represented by a diquark and a quark configuration. We also find that there is a duality relation among the parameters (m{sub {phi},}<{phi}{sup 2}>) for which the sum rule is equally good. In the limit when <{phi}{sup 2}>=0, we find m{sub {phi}=}400 MeV, which can be thought of as the constituent diquark mass.

Kim, Kyungil; Lee, Su Houng [Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of); Jido, Daisuke [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

2011-08-15

156

Digital books.  

PubMed

In this bimonthly series, the author examines how nurse educators can use the Internet and Web-based computer technologies such as search, communication, and collaborative writing tools; social networking and social bookmarking sites; virtual worlds; and Web-based teaching and learning programs. This article describes digital books. PMID:22024672

Wink, Diane M

2011-01-01

157

Digital Mammography  

Cancer.gov

Conventional mammography uses X-rays to look for tumors or suspicious areas in the breasts. Digital mammography also uses X-rays, but the data is collected on computer instead of on a piece of film. This means that the image can be computer-enhanced,

158

Digital Storytelling  

NSDL National Science Digital Library

What's a digital story? The folks at the Digital Storytelling initiative at The Ohio State University define it thusly: "a short (3-5 minute) movie which uses images, voice, and music to tell a story." The initiative is a great idea and this website offers visitors the chance to get acquainted with the digital stories that are being created at the school. Visitors should start their journey here by navigating over to the Stories area. Here they will find examples of these narratives, including "Howling at the Moon," "Clover Angst," "Our Sacred Circles," and "What's This Say?" Moving on, the Resources area includes information for those who would like to create their own digital stories. The links here lead to copyright-free audio and video sources, along with low-cost or free images. Also, this section includes helpful handouts that are used in the storytelling workshops at the OSU campus. No doubt this website will be a source of motivation and inspiration for those people who might like to create their own narratives.

2012-08-31

159

Digital Tidbits  

ERIC Educational Resources Information Center

Technology has transformed libraries. There are digital libraries, electronic collections, online databases and catalogs, ebooks, downloadable books, and much more. With free technology such as social websites, newspaper collections, downloadable online calendars, clocks and sticky notes, online scheduling, online document sharing, and online…

Kumaran, Maha; Geary, Joe

2011-01-01

160

20 CFR 225.26 - Residual Lump-Sum PIA.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Residual Lump-Sum PIA. 225.26 Section 225.26 Employees...Annuities and the Amount of the Residual Lump-Sum Payable § 225.26 Residual Lump-Sum PIA. The Residual Lump-Sum PIA (RLS...

2010-04-01

161

5 CFR 591.222 - How does OPM use the expenditure weights to combine price indexes?  

Code of Federal Regulations, 2010 CFR

...SERVICE REGULATIONS ALLOWANCES AND DIFFERENTIALS Cost-of-Living Allowance and Post Differential-Nonforeign Areas Cost-Of-Living...by the sum of the weights used in the calculation. This produces a price index for...

2010-01-01

162

Effect of clothing weight on body weight  

Technology Transfer Automated Retrieval System (TEKTRAN)

Background: In clinical settings, it is common to measure weight of clothed patients and estimate a correction for the weight of clothing, but we can find no papers in the medical literature regarding the variability in clothing weight with weather, season, and gender. Methods: Fifty adults (35 wom...

163

Mining Weighted Association Rules without Preassigned Weights  

E-print Network

Mining Weighted Association Rules without Preassigned Weights Ke Sun and Fengshan Bai Abstract--Association rule mining is a key issue in data mining. However, the classical models ignore the difference between the transactions, and the weighted association rule mining does not work on databases with only binary attributes

Bai, Fengshan

164

Informed Test Component Weighting.  

ERIC Educational Resources Information Center

Identifies and evaluates alternative methods for weighting tests. Presents formulas for composite reliability and validity as a function of component weights and suggests a rational process that identifies and considers trade-offs in determining weights. Discusses drawbacks to implicit weighting and explicit weighting and the difficulty of…

Rudner, Lawrence M.

2001-01-01

165

Bottom quark mass from sum rules to  

NASA Astrophysics Data System (ADS)

We use the approximation of the heavy-quark vacuum polarization function in the threshold region to determine the bottom quark mass from nonrelativistic sum rules. We find very good stability and convergence of the perturbative series for the bottom quark mass in renormalization scheme. Our final result is.

Penin, Alexander A.; Zerf, Nikolai

2014-04-01

166

On the sum of generalized Fibonacci sequence  

NASA Astrophysics Data System (ADS)

We consider the generalized Fibonacci sequence {Un defined by U0 = 0, U1 = 1, and Un+2 = pUn+1+qUn for all n?Z0+ and p, q?Z+. In this paper, we derived various sums of the generalized Fibonacci sequence from their recursive relations.

Chong, Chin-Yoon; Ho, C. K.

2014-06-01

167

Acoustic sum rule at a crystal surface  

NASA Astrophysics Data System (ADS)

The dynamical charge tensor of a given ion measures the macroscopic polarization linearly induced by a sublattice displacement. The acoustic sum rule states that the sum of the dynamical charges over the unit cell is zero. This sum rule ensures that a rigid translation of the whole crystal induces no dipole, and can be spelled out saying that the cell is ``dynamically neutral''. The molecular (or cluster) analogues of the dynamical charges are also well known. Even in this case dynamical neutrality is required: the dynamical charges sum up to zero over the whole finite system. The case of a surface (i.e. a semi-infinite solid) has required little or no attention. We show that a solid surface must be dynamically neutral, and this rule implies a non trivial constraint for the dynamical charges of the surface ions. In the particular case of a polar insulating surface the ions in the surface region cannot display the same dynamical charges as in the bulk. A numerical case study is presented.

Ruini, A.; Resta, R.; Baroni, S.

1997-03-01

168

Parallel algorithms for finding trigonometric sums  

SciTech Connect

Parallel versions of Goertzel and Reinsch algorithms for finding trigonometric sums are introduced as a special case of effcient parallel algorithms for solving linear recurrence systems. The results of the experiments performed on a 20-processors Sequent Symmetry are presented and discussed.

Stpiczynski, P. [Marie Curie-Sklodowska Univ., Lublin (Poland); Paprzycki, M. [Univ. of Texas of the Permian Basin, Odessa, TX (United States)

1995-12-01

169

Sum rules of codon usage probabilities  

E-print Network

In the crystal basis model of the genetic code, it is deduced that the sum of usage probabilities of the codons with C and A in the third position for the quartets and/or sextets is independent of the biological species for vertebrates. A comparison with experimental data shows that the prediction is satisfied within about 5 %.

Frappat, L; Sorba, Paul

2003-01-01

170

Sum rules for codon usage probabilities  

NASA Astrophysics Data System (ADS)

In the crystal basis model of the genetic code, it is deduced that the sum of usage probabilities of the codons with C and A in the third position for the quartets and/or sextets is independent of the biological species for vertebrates. A comparison between the theoretical predictions and the experimental data shows a satisfactory agreement.

Frappat, L.; Sciarrino, A.; Sorba, P.

2003-05-01

171

Riemann Sums: A Symbolic and Graphical Approach  

NSDL National Science Digital Library

This demo uses a computer algebra system to investigate various approximations to the definite integral. Right hand endpoint, left hand endpoint and midpoint Riemann sums as well as trapezoidal and Simpson's rules are expressed in closed form as functions of the change in x.

Roberts, Lila F.

172

Examining Students' Conceptions Using Sum Functions  

ERIC Educational Resources Information Center

Students' understanding of functions is a topic that has been researched extensively. In this qualitative study, five university students of varying mathematical backgrounds were interviewed to reveal strategies and misconceptions as they struggled with graphical and analytical tasks relating to sum functions. Weaker students are seen to rely…

Ratliff, Kevin; Garofalo, Joe

2006-01-01

173

Fibonacci Identities via the Determinant Sum Property  

ERIC Educational Resources Information Center

We use the sum property for determinants of matrices to give a three-stage proof of an identity involving Fibonacci numbers. Cassini's and d'Ocagne's Fibonacci identities are obtained at the ends of stages one and two, respectively. Catalan's Fibonacci identity is also a special case.

Spivey, Michael

2006-01-01

174

Digital History  

NSDL National Science Digital Library

Utilizing digital and online technologies to teach different disciplines continues to be quite popular, and the Digital History website will be a most welcome find for teachers (and students) of American history. Developed in collaboration with the University of Houston, the Chicago Historical Society, the Museum of Fine Arts in Houston and several other entities the site includes an online American history textbook, an interactive timeline, a multimedia section, and a very rich selection of primary source materials. The multimedia section is a real find, as it contains several well-thought out lectures with titles like "The History of Domestic Violence", "The Cultural Civil War of the 1960s", and "America Today and America Past". Students will also appreciate the writing guide area, as it contains several short essays on how to write in a history class and how to compose a critical book review.

175

Digital Morphology  

NSDL National Science Digital Library

Have you ever wanted to look into the shape and structure of a suckermouth armored catfish? Well, the Digital Morphology website makes that possible. Created as part of the National Science Foundation Digital Library at The University of Texas at Austin, this library includes hundreds of 2D and 3D visualizations of the internal and external structure of living and extinct vertebrates, and a number of invertebrates as well. These images are generated by a X-ray CT scanner, which has greater resolution and penetrating power than a conventional medical diagnostic CAT scanner. Visitors can browse the library by scientific name, common name, or the popular What's New? area. The homepage includes eight different overview pages, which provide narrative essays and images of dinosaurs, tapirs, bats, and primates. The site also has a Learn More section which provides additional material on X-ray CT's and the science behind 3D printing.

2012-03-23

176

A method to compute periodic sums  

NASA Astrophysics Data System (ADS)

In a number of problems in computational physics, a finite sum of kernel functions centered at N particle locations located in a box in three dimensions must be extended by imposing periodic boundary conditions on box boundaries. Even though the finite sum can be efficiently computed via fast summation algorithms, such as the fast multipole method (FMM), the periodized extension is usually treated via a different algorithm, Ewald summation, accelerated via the fast Fourier transform (FFT). A different approach to compute this periodized sum just using a blackbox finite fast summation algorithm is presented in this paper. The method splits the periodized sum into two parts. The first, comprising the contribution of all points outside a large sphere enclosing the box, and some of its neighbors, is approximated inside the box by a collection of kernel functions (“sources”) placed on the surface of the sphere or using an expansion in terms of spectrally convergent local basis functions. The second part, comprising the part inside the sphere, and including the box and its immediate neighborhood, is treated via available summation algorithms. The coefficients of the sources are determined by least squares collocation of the periodicity condition of the total potential, imposed on a circumspherical surface for the box. While the method is presented in general, details are worked out for the case of evaluating electrostatic potentials and forces. Results show that when used with the FMM, the periodized sum can be computed to any specified accuracy, at an additional cost of the order of the free-space FMM. Several technical details and efficient algorithms for auxiliary computations are provided, as are numerical comparisons.

Gumerov, Nail A.; Duraiswami, Ramani

2014-09-01

177

Maintaining a Healthy Weight  

MedlinePLUS

... and drink Other ways to maintian a healthy weight? Limit portion size to control calorie intake. Add ... Go4Life Maintaining a Healthy Weight Maintaining a healthy weight is important for overall health and well-being. ...

178

40 CFR 90.708 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2013 CFR

...where applicable), all previous sample size and CumSum statistic calculations...inserting the new FEL into the sample size equation as specified in § 90...calculations remain unchanged. If the sample size calculation indicates...

2013-07-01

179

40 CFR 90.708 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2011 CFR

...where applicable), all previous sample size and CumSum statistic calculations...inserting the new FEL into the sample size equation as specified in § 90...calculations remain unchanged. If the sample size calculation indicates...

2011-07-01

180

40 CFR 90.708 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2012 CFR

...where applicable), all previous sample size and CumSum statistic calculations...inserting the new FEL into the sample size equation as specified in § 90...calculations remain unchanged. If the sample size calculation indicates...

2012-07-01

181

40 CFR 90.708 - Cumulative Sum (CumSum) procedure.  

Code of Federal Regulations, 2010 CFR

...where applicable), all previous sample size and CumSum statistic calculations...inserting the new FEL into the sample size equation as specified in § 90...calculations remain unchanged. If the sample size calculation indicates...

2010-07-01

182

40 CFR 90.708 - Cumulative Sum (CumSum) procedure.  

...where applicable), all previous sample size and CumSum statistic calculations...inserting the new FEL into the sample size equation as specified in § 90...calculations remain unchanged. If the sample size calculation indicates...

2014-07-01

183

sum of cubes 11/13/2007 1 Sum of Cubes  

E-print Network

sum of cubes 11/13/2007 1 Sum of Cubes Jo was supposed to be studying for her grade 12 physics test down the cubes of the list you've just made." She knew just what to do. She listed the cubes (using her is wonderful when you get a reaction like that. Table for n = 24 Divisors of 24 # of divisors cubes of col 2 1

Taylor, Peter

184

Body Weight Relationships in Early Marriage: Weight Relevance, Weight Comparisons, and Weight Talk  

PubMed Central

This investigation uncovered processes underlying the dynamics of body weight and body image among individuals involved in nascent heterosexual marital relationships in Upstate New York. In-depth, semi-structured qualitative interviews conducted with 34 informants, 20 women and 14 men, just prior to marriage and again one year later were used to explore continuity and change in cognitive, affective, and behavioral factors relating to body weight and body image at the time of marriage, an important transition in the life course. Three major conceptual themes operated in the process of developing and enacting informants’ body weight relationships with their partner: weight relevance, weight comparisons, and weight talk. Weight relevance encompassed the changing significance of weight during early marriage and included attracting and capturing a mate, relaxing about weight, living healthily, and concentrating on weight. Weight comparisons between partners involved weight relativism, weight competition, weight envy, and weight role models. Weight talk employed pragmatic talk, active and passive reassurance, and complaining and critiquing criticism. Concepts emerging from this investigation may be useful in designing future studies of and approaches to managing body weight in adulthood. PMID:21864601

Bove, Caron F.; Sobal, Jeffery

2011-01-01

185

A Linear Algorithm for the Pos\\/Neg-Weighted 1Median Problem on a Cactus  

Microsoft Academic Search

The 1-median problem on a network asks for a vertex minimizing the sum of the weighted shortest path distances from itself\\u000a to all other vertices, each associated with a certain positive weight. We allow fornegative weights as well and devise an exact algorithm for the resulting ‘pos\\/neg-weighted’ problem defined on a cactus. The algorithm\\u000a visits every vertex just once and

Rainer E. Burkard; Jakob Krarup

1998-01-01

186

Novel feature extraction method based on weight difference of weighted network for epileptic seizure detection.  

PubMed

The extraction method of classification feature is primary and core problem in all epileptic EEG detection algorithms, since it can seriously affect the performance of the detection algorithm. In this paper, a novel epileptic EEG feature extraction method based on the statistical parameter of weighted complex network is proposed. The EEG signal is first transformed into weighted network and the weight differences of all the nodes in the network are analyzed. Then the sum of top quintile weight differences is extracted as the classification feature. At last, the extracted feature is applied to classify the epileptic EEG dataset. Experimental results show that the single feature classification based on the extracted feature obtains higher classification accuracy up to 94.75%, which indicates that the extracted feature can distinguish the ictal EEG from interictal EEG and has great potentiality of real-time epileptic seizures detection. PMID:25570685

Fenglin Wang; Qingfang Meng; Hong-Bo Xie; Yuehui Chen

2014-08-01

187

Hydrophobic potential by pairwise surface area sum.  

PubMed

An approximate but rapid method for estimating hydrophobic energy is proposed. Aside from a scale factor, it is given by the pairwise sum of the surface area buried by each neighbor atom, but excluding those atoms in the same residue or in its sequence neighbor residues. This sum is found to be linearly related to the true buried area as calculated by the algorithm of Lee and Richards [1971, J. Mol. Biol., 55, 379-400], and to the contact potential of Miyazawa and Jernigan [1985, Macromolecules, 18, 534-552]. It correlates with experimental transfer free energies to approximately the same degree as that calculated using the true buried area. Furthermore, in a simple test of helix packing with ROP protein monomer, the new hydrophobic energy clearly discriminated one structure, with the lowest r.m.s. deviation from the crystal structure, against an exhaustive set of others. PMID:8532664

Kurochkina, N; Lee, B

1995-05-01

188

Nonperturbative black hole entropy and Kloosterman sums  

E-print Network

Non-perturbative quantum corrections to supersymmetric black hole entropy often involve nontrivial number-theoretic phases called Kloosterman sums. We show how these sums can be obtained naturally from the functional integral of supergravity in asymptotically AdS_2 space for a class of black holes. They are essentially topological in origin and correspond to charge-dependent phases arising from the various gauge and gravitational Chern-Simons terms and boundary Wilson lines evaluated on Dehn-filled solid 2-torus. These corrections are essential to obtain an integer from supergravity in agreement with the quantum degeneracies, and reveal an intriguing connection between topology, number theory, and quantum gravity. We give an assessment of the current understanding of quantum entropy of black holes.

Atish Dabholkar; Joao Gomes; Sameer Murthy

2014-03-31

189

Vibrational sum frequency study on biological interfaces  

E-print Network

.......................................................................................................... 30 9 Sum frequency spectra of (a) a bare silica/water interface at pH 8.0, (b) an FRN coated surface at pH 8.0, (c) an FRN coated surface at pH 5.5, (d) an FRN coated surface at pH 3.2, (e) an FRN coated surface at pH 5.5 after cycling to pH 3... FIGURE Page 12 Sum frequency spectra of (a) bare quartz/water interface at pH8.0 PBS buffer solution, and adsorptions of (b) fibrinogen (c) fragment X and (d) alpha C domains on quartz surfaces in pH 8.0 PBS...

Lim, Soon Mi

2009-06-02

190

Recent progress on sum-frequency spectroscopy  

NASA Astrophysics Data System (ADS)

Second harmonic generation (SHG) and sum frequency spectroscopy (SFS) have provided unique opportunities to probe surfaces and interfaces. They have found broad applications in many disciplines of science and technology. In recent years, there has been significant progress in the development of SHG/SFS technology that has significantly broadened the applications of SHG and SFS. In this article, we review the recent progress of the field with emphasis on SFS.

Tian, C. S.; Shen, Y. R.

2014-09-01

191

Uncertainty Principles and Sum Complexes Roy Meshulam  

E-print Network

Uncertainty Principles and Sum Complexes Roy Meshulam March 28, 2014 Abstract Let p be a prime@math.technion.ac.il . Supported by an ISF grant. 1 #12;of the Heisenberg quantum-mechanical uncertainty principle: If f L2 (R of the uncertainty principle. Let G be a finite abelian group and let F[G] be the group algebra of G over the field F

Meshulam, Roy

192

Nonmeasurable algebraic sums of sets of reals  

Microsoft Academic Search

We present a theorem which generalizes some known theorems on the existence of nonmeasurable (in various senses) sets of the form X+Y. Some additional related questions concerning measure, category and the algebra of Borel sets are also studied. Sierpinski showed in (14) that there exist two sets X;Y µR of Lebesgue measure zero such that their algebraic sum, i.e. the

Marcin Kysiak

2005-01-01

193

Convolution equivalence and distributions of random sums  

Microsoft Academic Search

A serious gap in the Proof of Pakes’s paper on the convolution equivalence of infinitely divisible distributions on the line\\u000a is completely closed. It completes the real analytic approach to Sgibnev’s theorem. Then the convolution equivalence of random\\u000a sums of IID random variables is discussed. Some of the results are applied to random walks and Lévy processes. In particular,\\u000a results

Toshiro Watanabe

2008-01-01

194

Supersymmetric sum rules for electromagnetic multipoles  

SciTech Connect

We derive model-independent, nonperturbative supersymmetric sum rules for the magnetic and electric multipole moments of any theory with N=1 supersymmetry. We find that in any irreducible N=1 supermultiplet the diagonal matrix elements of the {ital l}-multipole moments are completely fixed in terms of their off-diagonal matrix elements and the diagonal (l{minus}1)-multipole moments. {copyright} {ital 1998} {ital The American Physical Society}

Giannakis, I.; Liu, J.T. [Physics Department, The Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States)] [Physics Department, The Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States); Porrati, M. [Physics Department, The Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States)] [Physics Department, The Rockefeller University, 1230 York Avenue, New York, New York 10021-6399 (United States); [Department of Physics, New York University, 4 Washington Place, New York, New York 10003 (United States)

1998-08-01

195

Sums Involving the Hurwitz Zeta Function  

Microsoft Academic Search

We shall prove a general closed formula for integrals considered by Ramanujan, from which we derive our former results on sums involving Hurwitz zeta-function in terms not only of the derivatives of the Hurwitz zeta-function, but also of the multiple gamma function, thus covering all possible formulas in this direction. The transition from the derivatives of the Hurwitz zeta-function to

Shigeru Kanemitsu; Hiroshi Kumagai; Masami Yoshimoto

2001-01-01

196

Coulomb sum rule in the quasielastic region  

Microsoft Academic Search

Within a relativistic single particle model, we calculate the Coulomb sum\\u000arule of inclusive electron scattering from $^{40}$Ca and $^{208}$Pb in\\u000aquasielastic region. Theoretical longitudinal and transverse structure\\u000afunctions are extracted for three momentum transfers from 300 to 500 MeV\\/c and\\u000acompared with the experimental data measured at Bates and Saclay. We find that\\u000athere is no drastic suppression of

K. S. Kim; B. G. Yu; M. K. Cheoun

2006-01-01

197

Gradient Weight in Phonology  

ERIC Educational Resources Information Center

Research on syllable weight in generative phonology has focused almost exclusively on systems in which weight is treated as an ordinal hierarchy of clearly delineated categories (e.g. light and heavy). As I discuss, canonical weight-sensitive phenomena in phonology, including quantitative meter and quantity-sensitive stress, can also treat weight

Ryan, Kevin Michael

2011-01-01

198

Strawkets and Weight  

NSDL National Science Digital Library

In this activity, students investigate the effect that weight has on rocket flight. Students construct a variety of their own straw-launched rockets, or "strawkets," that have different weights. Specifically, they observe what happens when the weight of a strawket is altered by reducing its physical size and using different construction materials. Finally, the importance of weight distribution in a rocket is determined.

Integrated Teaching And Learning Program

199

Weight gain in pregnancy  

Microsoft Academic Search

Pregnancy and body weight development are intertwined in complicated patterns. Of the obese patients at our Obesity Unit, 73% had retained >10 kg in connection with a pregnancy. For the general population the effect of a preg- nancy on future weight development is surpris- ingly difficult to predict. In the Stockholm pregnancy and weight development study the estimated mean weight

Stephan Rossner

200

Scanning for Digitization Projects  

ERIC Educational Resources Information Center

Librarians and archivists find themselves facing the prospect of digitization. Everyone is doing it, everyone needs it. Discussions rage nationally and internationally concerning what to digitize and the best means to present and retain digital objects. Digitization is the act of making something digital, expressing a physical object "in numerical…

Wentzel, Larry

2007-01-01

201

Coincidence summing corrections for a clover detector  

NASA Astrophysics Data System (ADS)

The true coincidence summing effect on the full energy peak efficiency calibration of a clover HPGe detector for point sources has been determined as a function of sample-to-detector distance using mono-energetic and multi-energetic gamma ray sources. The coincidence summing effect has been observed to increase at closer distances with the correction factors as high as 1.25 at closest distance studied. The correction factors for the total and the photopeak efficiencies have been obtained using the analytical method. The clover detector response has been simulated using MCNP code, taking care of the bevels and the flat surfaces of the clover detector. The geometry of the clover detector has been optimized to match the experimental and the theoretical efficiencies. The true coincidence summing correction factors (kTCS) have also been experimentally obtained by taking the ratio of corresponding mono-energetic extrapolated efficiencies to multi-energetic efficiencies. The kTCS obtained from analytical method has been found to match with the experimental kTCS with the simulated values within 1-5%.

Agarwal, Chhavi; Danu, L. S.; Gathibandhe, M.; Goswami, A.; Biswas, D. C.

2014-11-01

202

The developmental evolution of avian digit homology: an update.  

PubMed

The identity of avian digits has been unresolved since the beginning of evolutionary morphology in the mid-19th century, i.e. as soon as questions of phylogenetic homology have been raised. The main source of concern is the persistent discrepancy between anatomical/paleontological and embryological evidence over the identity of avian digits. In this paper, recent evidence pertaining to the question of avian digit homology is reviewed and the various ideas of how to resolve the disagreement among developmental and phylogenetic evidence are evaluated. Paleontological evidence unequivocally supports the hypothesis that the fully formed digits of maniraptoran theropods are digits DI, DII, and DIII, because the phylogenetic position of Herrerasaurus is resolved, even when hand characters are excluded from the analysis. Regarding the developmental origin of the three digits of the avian hand the discovery of an anterior digit condensation in the limb bud of chickens and ostriches conclusively shows that these three digits are developing from condensations CII, CIII, and CIV. The existence of this additional anterior condensation has been confirmed in four different labs, using four different methods: Alcian blue staining, PNA affinity histochemistry, micro-capillary regression and Sox9 expression. Finally, recent evidence shows that the digit developing from condensation CII has a Hox gene expression pattern that is found in digit DI of mice forelimb and chick hind limbs. The sum of these data supports the idea that digit identity has shifted relative to the location of condensations, known as Frame Shift Hypothesis, such that condensation CII develops into digit DI and condensation CIII develops into digit DII, etc. A review of the literature on the digit identity of the Italian Three-toed Skink or Luscengola (Chalcides chalcides), shows that digit identity frame shifts may not be limited to the bird hand but may be characteristic of "adaptive" digit reduction in amniotes (sensu Steiner, H., Anders, G., 1946. Zur Frage der Entstehung von Rudimenten. Die Reduktion der Gliedmassen von Chalcides tridactylus Laur. Rev. Suisse Zool. 53, 537-546) in general. In this mode of evolution two digits are lost, in the course of the adaptation of the three anterior digits to a function that does not require the two posterior digits. This evidence suggests that the evolution of digits in tetrapods can proceed at least on two distinct levels of integration, the level of digit condensations and that of adult digits. PMID:17046354

Wagner, Günter P

2005-11-01

203

Digital Himalaya  

NSDL National Science Digital Library

For those who feel that there may be a paucity of material on the Himalayan region, they will need to take a close look at this fine site provided through a collaboration between the Department of Social Anthropology at Cambridge University and the Anthropology Department at Cornell University. Since its inception in December 2000, the partners have managed to digitize a number of photographic collections, several journals, and a number of short films. Scholars with an interest in Himalayan studies will want to browse through the digitized volumes of such publications as Contributions to Nepalese Studies and the Journal of Bhutan Studies. One particularly intriguing collection made available here is the Frederick Williamson Collection. Williamson was a British political officer stationed in Sikkim, Bhutan, and Tibet during the 1930s. During his tenure there he and his wife took some 1,700 photographs documenting their experiences and also made a number of short films, which are also available for viewing on the site. Visitors to the site may also want to register with the project so that they are informed of project updates. [KMG

204

Optimal Weight Gain  

Microsoft Academic Search

Optimal birth weight and outcome are influenced by maternal weight gain. Low gestational weight gain is associated with poor\\u000a fetal growth and risk of preterm delivery. Excessive weight gain affects infant growth, body fatness in childhood, and the\\u000a potential for postpartum weight retention and future obesity. Guidelines from the Institute of Medicine recommend that a woman\\u000a with a normal body

Grace A. Falciglia; Kristin H. Coppage

205

PREVENTING WEIGHT REGAIN AFTER WEIGHT LOSS  

Technology Transfer Automated Retrieval System (TEKTRAN)

For most dieters, a regaining of lost weight is an all too common experience. Indeed, virtually all interventions for weight loss show limited or even poor long-term effectiveness. This sobering reality was reflected in a comprehensive review of nonsurgical treatments of obesity conducted by the Ins...

206

Sums of products of generalized Fibonacci and Lucas numbers  

E-print Network

In this paper, we establish several formulae for sums and alternating sums of products of generalized Fibonacci and Lucas numbers. In particular, we recover and extend all results of Z. Cerin and Z. Cerin & G. M. Gianella, more easily.

Belbachir, Hacene

2007-01-01

207

Simple pulse counting circuit computes sum of squares  

NASA Technical Reports Server (NTRS)

Pulse counting circuit with an extra chain of flip-flops, delay lines, and gates computes the sum of the squares of the pulse sequences. A pulse train and the sum of the squares of the pulses are simultaneously completed.

Schaefer, D. H.

1965-01-01

208

Rapid vibrational imaging with sum frequency generation microscopy  

E-print Network

Rapid vibrational imaging with sum frequency generation microscopy Varun Raghunathan,1, Yang Han,1, 2011 We demonstrate rapid vibrational imaging based on sum frequency generation (SFG) microscopy parametric oscillator, vibrationally selective imaging of collagen fibers is achieved with submicrometer

Potma, Eric Olaf

209

Theoretical analysis on the sampling criteria for time-interleaved photonic analog-to-digital converters  

NASA Astrophysics Data System (ADS)

Time-interleaved photonic analog-to-digital converter (TIPADC) is a promising candidate to process ultra-wideband signals. In a TIPADC, quantization is electrical in order to obtain large effective number of bits (ENOB). In this paper, we study the issues on the signal sampling and reconstruction in the TIPADC from the systematic point of view. The sampling output and frequency response of the system are derived using a model that includes the photonic sampling, demultiplexing, photo detecting, electronic quantizing and digital processing. The signal sampling and reconstruction mechanism of TIPADC with a uniform system sampling rate and matched channels are illuminated with the spectrum of signal in each processing step. The effect of the sampling pulse and back-end electronics on the system frequency response is analyzed in detail. The feasible regions of the system for alias-free sampling in terms of system frequency response, and a set of sampling criteria on bandwidth of the sampling pulse and back-end electronics are presented for the TIPADC. We find that the analog bandwidth of TIPADC can be much higher than the bandwidth of back-end electronics due to the weighted summing introduced by the multichannel time-interleaved photonic sampling. The proposed model and sampling criteria are validated by simulations under different parameter configurations.

Chen, Jianping; Su, Feiran; Wu, Guiling

2014-11-01

210

The Exploratorium Digital Library  

NSDL National Science Digital Library

The Exploratorium digital library includes digital media, digitized museum materials related to interactive exhibits and scientific phenomena. Highlights include a polar media collection, a math activity database, and podcasts on a variety of topics.

211

NCI Digital Media Guidelines  

Cancer.gov

NCI Digital Media Guidelines The NCI Digital Media Guidelines provide developers and content managers guidance on the visual and content standards, as well as policies and procedures, in effect for National Cancer Institute (NCI) digital media – including

212

RAM digital filter  

NASA Technical Reports Server (NTRS)

Modification of conventional digital counting filter is designed to store all possible combinations of filter coefficients in random access memory. Filter includes analog-to-digital coverter, X shift register, memory, accumulator, and digital-to-analog converter.

Zohar, S.

1977-01-01

213

Analog simulation of flux-summing servo-model, phases 1 and 2  

NASA Technical Reports Server (NTRS)

The analog simulation was developed for a closed-loop system having an electrohydraulic flux-summing servo valve and actuator with associated inertial load. One-fourth of the system's total forward gain is carried by each of four channels. The present study successfully applied failure mode management techniques to the problem of channel failure. Digital logic circuitry was developed to maintain the overall forward gain of the system at a constant value, in the presence of channel failure. Finally, the stability of the system was verified, and performance characteristics were determined through the use of frequency response methods.

Hriber, E. J.

1984-01-01

214

Sum capacity and TSC bounds in collaborative multibase wireless systems  

Microsoft Academic Search

We consider a wireless system with base stations which collaborate, and derive bounds on sum capacity and total squared correlation for uniform channels between users and bases. The correspondence also investigates structural properties which must be satisfied by user transmit covariance matrices at the optimal sum capacity\\/total squared correlation (TSC) point, and shows that for multibase systems, maximizing sum capacity

Otilia Popescu; Christopher Rose

2004-01-01

215

Light Scalar Mesons in the QCD Sum Rule  

E-print Network

We study the light scalar mesons in the QCD sum rule. We find that there are five independent scalar tetraquark currents in the local form, and we perform QCD sum rule analysis using both these currents and their combinations. Compared with the sum rules by conventional \\bar{q} q currents, our result supports a tetraquark structure for low-lying scalar mesons.

Hua-Xing Chen; Atsushi Hosaka; Shi-Lin Zhu

2007-11-07

216

On the Average Value of Divisor Sums in Arithmetic Progressions  

Microsoft Academic Search

We consider very short sums of the divisor function in arithmetic progressions prime to a flxed modulus and show that, on average, such sums are close to the expected value. We also give some applications of our result to sums of the divisor function twisted with characters (both additive and multiplicative) taken on the values of various functions, such as

William D. Banks; Igor E. Shparlinski

217

On Summing Operators on JB*-triples Antonio M. Peralta*  

E-print Network

On Summing Operators on JB*-triples Antonio M. Peralta-mail: aperalta@goliat.ugr.es Abstract In this paper we introduce 2-JB*-triple-summing operators on real and complex JB*-triples. These operators generalize 2-C*-summing operators

218

On Summing Operators on JB*-triples Antonio M. Peralta  

E-print Network

On Summing Operators on JB*-triples Antonio M. Peralta Departamento de An´alisis Matem In this paper we introduce 2-JB*-triple-summing operators on real and complex JB*-triples. These operators in the setting of 2-JB*-triple-summing operators on JB*- triples. Mathematics Subject Classification: 17C65, 46L

219

7 CFR 1726.205 - Multiparty lump sum quotations.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 false Multiparty lump sum quotations. 1726.205 Section 1726...Procedures § 1726.205 Multiparty lump sum quotations. The borrower or its engineer...be received. On the basis of written lump sum quotations, the borrower will select...

2010-01-01

220

23 CFR 140.920 - Lump sum payments.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 2010-04-01 false Lump sum payments. 140.920 Section 140.920...Reimbursement for Railroad Work § 140.920 Lump sum payments. Where approved by FHWA...3), reimbursement may be made as a lump sum payment, in lieu of actual...

2010-04-01

221

28 CFR 523.16 - Lump sum awards.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Lump sum awards. 523.16 Section 523.16...SENTENCE Extra Good Time § 523.16 Lump sum awards. Any staff member may recommend...Warden the approval of an inmate for a lump sum award of extra good time. Such...

2010-07-01

222

29 CFR 4050.8 - Automatic lump sum.  

Code of Federal Regulations, 2010 CFR

... 2010-07-01 false Automatic lump sum. 4050.8 Section 4050.8 Labor...PARTICIPANTS § 4050.8 Automatic lump sum. This section applies to a missing...4050.5(a)(1) (mandatory lump sum) or § 4050.5(a)(2) (de...

2010-07-01

223

5 CFR 831.2004 - Amount of lump-sums.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Amount of lump-sums. 831.2004 Section 831.2004 Administrative...REGULATIONS (CONTINUED) RETIREMENT Payment of Lump Sums § 831.2004 Amount of lump-sums. If applicable, the amount of a refund...

2010-01-01

224

29 CFR 4044.75 - Other lump sum benefits.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Other lump sum benefits. 4044.75 Section 4044.75 Labor... Non-Trusteed Plans § 4044.75 Other lump sum benefits. The value of a lump sum benefit which is not covered under § 4044.73...

2010-07-01

225

Digital Horizons  

NSDL National Science Digital Library

Digital Horizons was established in 2007 by a consortium that includes Prairie Public Broadcasting, the State Historical Society of North Dakota, and several other organizations. The goal of their work is to provide and maintain access to "a wide range of historical and significant content related to North Dakota and Minnesota." Visitors can use the search engine here to look for items by general subject heading or collection. All told, there are over fifteen collections included in this archive, including "Korean War Propaganda Leaflets", "Dakota Lithographs and Engravings", and "North Dakota Blue Books". For those looking for a place to start, they can take advantage of the "Popular Searches" list, which includes topical headings such as "floods", "bonanza farms", and "homesteading". This last heading is a great place to check out, as visitors will find evocative (and sometimes quite lonely) photographs of 19th century homesteads.

226

Digital structural  

USGS Publications Warehouse

Magmatic and tectonic activity have both contributed significantly to the surface geology of Mars. Digital structural mapping techniques have now been used to classify and date centers of tectonic activity in the western equatorial region. For example, our results show a center of tectonic activity at Valles Marineris, which may be associated with uplift caused by intrusion. Such evidence may help explain, in part, the development of the large troughs and associated outflow channels and chaotic terrain. We also find a local centre of tectonic activity near the source region of Warrego Valles. Here, we suggest that the valley system may have resulted largely from intrusive-related hydrothermal activity. We hope that this work, together with the current Mars Global Surveyor mission, will lead to a better understanding of the geological processes that shaped the Martian surface.

Dohm, J.M.; Anderson, R.C.; Tanaka, K.L.

1998-01-01

227

Digital Avionics  

NASA Technical Reports Server (NTRS)

Digital Avionics activities played an important role in the advancements made in civil aviation, military systems, and space applications. This document profiles advances made in each of these areas by the aerospace industry, NASA centers, and the U.S. military. Emerging communication technologies covered in this document include Internet connectivity onboard aircraft, wireless broadband communication for aircraft, and a mobile router for aircraft to communicate in multiple communication networks over the course of a flight. Military technologies covered in this document include avionics for unmanned combat air vehicles and microsatellites, and head-up displays. Other technologies covered in this document include an electronic flight bag for the Boeing 777, and surveillance systems for managing airport operations.

Koelbl, Terry G.; Ponchak, Denise; Lamarche, Teresa

2003-01-01

228

Digital Avionics  

NASA Technical Reports Server (NTRS)

The field of digital avionics experienced another year of important advances in civil aviation, military systems, and space applications. As a result of the events of 9/11/2001, NASA has pursued activities to apply its aerospace technologies toward improved aviation security. Both NASA Glenn Research Center and Langley Research Center have performed flight research demonstrations using advanced datalink concepts to transmit live pictures from inside a jetliner, and to downlink the contents of the plane's 'black box' recorder in real time. The U.S. Navy and General Electric demonstrated survivable engine control (SEC) algorithms during engine ground tests at the Weapons Survivability Laboratory at China Lake. The scientists at Boeing Satellite Systems advanced the field of stellar inertial technology with the development of a new method for positioning optical star trackers on satellites.

Koelbl, Terry G.; Ponchak, Denise; Lamarche, Teresa

2002-01-01

229

Digital Durham  

NSDL National Science Digital Library

Durham, North Carolina has been the subject of many scholarly works, and its particular location and context makes it a compelling place for persons interested in examining urbanization, immigration, industrialization, and emancipation in the late 19th and early 20th centuries. Created by Duke University and the North Carolina State Library, this digital archive presents a cornucopia of primary sources, including personal letters, entries from a prominent general store in the region, maps, and census data. Visitors should feel free to browse through these documents, or they can also perform a detailed search. Other features of the site include a brief geographic overview of the Piedmont region and a glossary of terms used in the 1880 census. Educators will enjoy looking over the "Teachers' Corner", which includes lesson plans that utilize some of the primary documents in the archive.

230

Digital Faces  

NSDL National Science Digital Library

Students will "digitize" photographs of human faces using various grid sizes and shades of gray. Through this activity, they gain an understanding of image resolution and how much information is needed to answer various questions.This introductory activity introduces skills that are used to recognize and interpret remotely sensed images, such as aerial photos and satellite images. To complete the activity, educators reproduce 8"x10" head shots of students (or use magazine images), and need to create transparencies with grid squares of different sizes to overlay the photographs. This activity is part of the Ground Truth Studies Teacher Handbook, which provides more than 20 activities to build student understanding of global change and remote sensing, and includes background chapters for teachers, glossary, and appendices.

231

Classification image weights and internal noise level estimation  

NASA Technical Reports Server (NTRS)

For the linear discrimination of two stimuli in white Gaussian noise in the presence of internal noise, a method is described for estimating linear classification weights from the sum of noise images segregated by stimulus and response. The recommended method for combining the two response images for the same stimulus is to difference the average images. Weights are derived for combining images over stimuli and observers. Methods for estimating the level of internal noise are described with emphasis on the case of repeated presentations of the same noise sample. Simple tests for particular hypotheses about the weights are shown based on observer agreement with a noiseless version of the hypothesis.

Ahumada, Albert J Jr

2002-01-01

232

On The Analysis of Spatially-Coupled GLDPC Codes and The Weighted Min-Sum Algorithm  

E-print Network

Page 2.1 A (C;m) GLDPC ensemble, where is a random permutation. . . . . 13 2.2 An example of (C;m; L; w) spatially-coupled GLDPC ensemble, where w = 3, and ( i; 0i) are random permutations at position i for bit nodes and constraint nodes... graph known as the Tanner graph of the code [6]. In this graph, there are two sets of nodes: the set of variable nodes and the set of check nodes. By treating the parity-check matrix as the adjacency matrix of the graph, rows in the parity...

Jian, Yung-Yih

2013-08-07

233

A PTAS for minimizing the weighted sum of job completion times on parallel machines  

Microsoft Academic Search

We consider the problem of scheduling a set of n jobs on midentical parallel machines so as to minimize the weightedsum of job completion times. This problem is NP-hard inthe strong sense. The best approximation result known sofar was a12 (1+p2)--approximation algorithm that has beenderived by Kawaguchi and Kyan back in 1986.The contribution of this paper is a polynomial time

Martin Skutella; GERHARD J. WOEGlNGERt

1999-01-01

234

MIMO Downlink Weighted Sum Rate Maximization with Power Constraints per Antenna Groups  

Microsoft Academic Search

We consider a single-cell multiple-input multiple-output (MIMO) downlink channel where linear transmission and reception strategy is employed. The base station (BS) transmitter is equipped with a scheduler using a simple opportunistic beamforming strategy, which associates an intended user for each of the transmitted data streams. For the case when the channel of the scheduled users is available at the BS,

Marian Codreanu; Antti Tolli; Markku J. Juntti; Matti Latva-aho

2007-01-01

235

Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence  

E-print Network

from being able to bound the horizontal position error via the horizontal protection level (HPL models are used for the HPL, and HPL calculations are performed correctly. The means of providing solution and the HPL is free of cycle error. When available, the algorithm uses redundant measurements

Stanford University

236

Multigaussian kriging for point-support estimation: incorporating constraints on the sum of the kriging weights  

Microsoft Academic Search

In the geostatistical analysis of regionalized data, the practitioner may not be interested in mapping the unsampled values\\u000a of the variable that has been monitored, but in assessing the risk that these values exceed or fall short of a regulatory\\u000a threshold. This kind of concern is part of the more general problem of estimating a transfer function of the variable

Xavier Emery

2006-01-01

237

WEIGHTED Lp -BOUNDEDNESS OF FOURIER SERIES  

E-print Network

Jacobi weight on the interval [-1, 1] and, for each function f, let Snf denote the n-th partial sum with respect to dµ. The study of the boundedness Snf Lp(updµ) C f Lp(vpdµ), (1) where u(x) = (1 - x)a (1 + x, . . . , N) (3) and A a, B b, Gi gi (4) hold, then C > 0 such that Snf Lp(updµ) C f Lp(vpdµ) f Lp (vp dµ

PĂ©rez, Mario

238

Two equivalent measures on weighted hypergraphs  

Microsoft Academic Search

Let H=(N,E,w) be a hypergraph with a node set N={0,1,…,n-1}, a hyperedge set E?2N, and real edge-weights w(e) for e?E. Given a convex n-gon P in the plane with vertices x0,x1,…,xn-1 which are arranged in this order clockwisely, let each node i?N correspond to the vertex xi and define the area AP(H) of H on P by the sum of

Hiro Ito; Hiroshi Nagamochi

2006-01-01

239

Metrical analysis of dromedary digital bones.  

PubMed

Dromedary camels are large even-toed ungulates which are well adapted to life in large deserts. Examinations of their feet have revealed many structural peculiarities. We have measured the digital bones of the dromedary in order to determine whether there are morphometric variations in the digital bones between the lateral and medial sides in individual limbs and/or in the right and left thoracic and pelvic limbs, with the aim to clarify whether there are anatomical differences in the digital bones of dromedary as a suborder of the order Artiodactyla. Measurements were made of 240 lateral and medial proximal, middle, and distal phalanges in the left and right thoracic and pelvic limbs of ten healthy adult male dromedaries, ranging in age from 6 to 10 years. A total of 17 linear dimensions were measured using a caliper. The results indicate that there are no significant differences between corresponding measurements of digital bones of the lateral and medial in the same limb, nor between measurements of the right and left sides. The lengths and widths of the proximal and middle, and distal phalanges in the thoracic limb were found to be greater than those of the pelvic limb. The sum of the total lengths of the three phalanges of the thoracic limbs was 15 mm greater than that of the phalanges of the pelvic limbs due to a longer proximal phalanx (76 %) and middle phalanx of the former (24 %). The perspectives obtained by our morphometric study of dromedary digital bones not only provide a tool to distinguish the osteological remains of the dromedary from those of the Bactrian camel or other artiodactyls in archaeological sites, but they also suggest a possible influence of digital structure on digit functions and digital disorders. PMID:24908273

Nourinezhad, Jamal; Mazaheri, Yazdan; Ahi, Mohammad Reza

2014-06-01

240

Sneaky Sums - Unknowns in a Grid  

NSDL National Science Digital Library

This webpage contains a link to a downloadable Geometer's Sketchpad activity that develops early algebraic reasoning. Students use the row and column sums of numerical values assigned to geometric shapes on a 4 x 4 grid to determine the values of each shape. They can create problems for a partner to solve. The page includes a 3-minute instructional video and downloadable PDFs of teacher notes and student worksheets. The activity opens on Geometer's Sketchpad and on iOS with Sketchbook Explorer (cataloged separately).

Scher, Daniel

2013-01-01

241

Sum Over Histories: Discrete Step Interpretation  

E-print Network

We study the transition of a particle between two points such that the particle takes discrete spatial steps in this transition. We analyze how the sum over histories interpretation of quantum mechanics can be implemented in this scenario. We show that the Euclidean propagator of a free particle is recovered if the minimum space interval is of the order or greater than the De Broglie's wavelength of the particle. We also describe the statistical ensembles that model this transition. Furthermore, we discuss a possible extension of this model to 2-dimensions which serves as an example to extend it to any number of spatial dimensions.

Muhammad Adeel Ajaib

2014-03-09

242

Orlov, Tarasov, and the Robinson Sum Rule  

SciTech Connect

A paper proving a result now commonly known as 'Robinson sum rule' was published by Orlov and Tarasov [J. Exp. Theor. Phys. 34 651 (1958) Sov. Phys. JETP 34 339 (1958)] at about the same time that Robinson himself published the result [Phys. Rev. 111 373 (1958)]. We assigned ourselves the task of reviewing this work, as narrowly as possible, in hopes of understanding how it should be considered in view of the existing attribution. The chronology of the work is reviewed and the degree to which the two works were independent and have qualitatively different content is considered.

Talman, Richard; /Cornell U., Phys. Dept.; Chao, Alexander W.; /SLAC

2011-12-01

243

Fast bilateral filtering using recursive moving sum  

NASA Astrophysics Data System (ADS)

We propose a constant-time algorithm for a bilateral filter. Bilateral filter can be converted into the operation of three-dimensional (3D) convolution. By using recursive moving sum, we can reduce the number of calculations needed to construct a pseudo-Gaussian filter. Applying one-dimensional Gaussian filter to the 3D convolution, we achieved a constant-time bilateral filter. We used a 3-GHz CPU without SIMD instructions, or multi-thread operations. We confirmed our proposed bilateral filter to be processed in constant time. In practical conditions, high PSNR values over 40 dB are obtained.

Igarashi, Masaki; Ikebe, Masayuki; Shimoyama, Sohsuke; Motohisa, Junichi

244

On Multiple Sums of Products of Lucas Numbers  

NASA Astrophysics Data System (ADS)

This paper studies some sums of products of the Lucas numbers. They are a generalization of the sums of the Lucas numbers, which were studied another authors. These sums are related to the denominator of the generating function of the kth powers of the Fibonacci numbers. We considered a special case for an even positive integer k in the previous paper and now we generalize this result to an arbitrary positive integer k. These sums are expressed as the sum of the binomial and Fibonomial coefficients. The proofs of the main theorems are based on special inverse formulas.

Seibert, Jaroslav; Trojovský, Pavel

2007-04-01

245

Complex-energy approach to sum rules within nuclear density functional theory  

E-print Network

The linear response of the nucleus to an external field contains unique information about the effective interaction, correlations, and properties of its excited states. To characterize the response, it is useful to use its energy-weighted moments, or sum rules. By comparing computed sum rules with experimental values, the information content of the response can be utilized in the optimization process of the nuclear Hamiltonian or EDF. But the additional information comes at a price: compared to the ground state, computation of excited states is more demanding. To establish an efficient framework to compute sum rules of the response that is adaptable to the optimization of the nuclear EDF and large-scale surveys of collective strength, we have developed a new technique within the complex-energy FAM based on the QRPA. To compute sum rules, we carry out contour integration of the response function in the complex-energy plane. We benchmark our results against the conventional matrix formulation of the QRPA theory...

Hinohara, Nobuo; Nazarewicz, Witold; Olsen, Erik

2015-01-01

246

Sums of squares over totally real fields are rational sums of squares  

Microsoft Academic Search

Let $K$ be a totally real number field with Galois closure $L$. We prove that\\u000aif $f \\\\in \\\\mathbb Q[x_1,...,x_n]$ is a sum of $m$ squares in $K[x_1,...,x_n]$,\\u000athen $f$ is a sum of \\\\[4m \\\\cdot 2^{[L: \\\\mathbb Q]+1} {[L: \\\\mathbb Q] +1 \\\\choose\\u000a2}\\\\] squares in $\\\\mathbb Q[x_1,...,x_n]$. Moreover, our argument is\\u000aconstructive and generalizes to the case of

Christopher J. Hillar

2008-01-01

247

Proven Weight Loss Methods  

MedlinePLUS

... still feel full. FACT SHEET Proven Weight loss Methods the diabetes prevention program (dpp) In this large ... 2 diabetes. www.hormone.org proven Weight loss methods fact sheet What other strategies can help you ...

248

Weight Gain during Pregnancy  

MedlinePLUS

... this page It's been added to your dashboard . Weight gain during pregnancy When you’re pregnant, you ... in sight! Be careful about the amount of weight you gain during your pregnancy. Gaining too much ...

249

Pregnancy and Healthy Weight  

MedlinePLUS

... Media Resources Selected Profiles & Interviews Multimedia Pregnancy & Healthy Weight Skip sharing on social media links Share this: ... Content New research shows that maintaining a healthy weight before and during pregnancy can reduce the likelihood ...

250

Weight and Diabetes  

MedlinePLUS

... a difference in a person's diabetes management plan. Weight and Type 1 Diabetes If a person has ... keep their blood sugar levels under control. Continue Weight and Type 2 Diabetes Most people are overweight ...

251

Weight Management and Calories  

MedlinePLUS

USDA Choose MyPlate.gov United States Department of Agriculture MyPlate What is MyPlate? Fruits Vegetables Grains Protein Foods Dairy Oils Weight & Calories Weight Management Calories Physical Activity What Is ...

252

Weight Loss for Life  

MedlinePLUS

... weight, you should still follow healthy eating and physical activity habits to help prevent weight gain and keep you healthy over the years. ... (interrupted breathing during sleep) 2 Body Mass Index BMI is a tool that is often used ...

253

Educational Applications for Digital Cameras.  

ERIC Educational Resources Information Center

Discusses uses of digital cameras in education. Highlights include advantages and disadvantages, digital photography assignments and activities, camera features and operation, applications for digital images, accessory equipment, and comparisons between digital cameras and other digitizers. (AEF)

Cavanaugh, Terence; Cavanaugh, Catherine

1997-01-01

254

Calculating Molecular Weight  

NSDL National Science Digital Library

This video and online calculator show how to calculate the molecular weight of a substance from the atomic weights given on the periodic table. Use the molecular weight to convert between the macroscopic scale (grams of a substance) and the microscopic scale (number of molecules of that substance).

255

Demystifying Weight Loss Diets  

Microsoft Academic Search

For virtually every letter of the alphabet there is a diet book and the numbers are growing. It is becoming increasingly difficult for consumers to make sound choices among the various weight loss books with conflicting weight loss approaches. Embattled by the burden of escalating rates of obesity and limited successes with achieving long term weight loss in a slimness-revered

Jenice Rankins; Michelle S. Williams; Dykibra J. Montgomery; David B. Wilton

2006-01-01

256

Birth Weight Statistical Models  

E-print Network

Birth Weight Statistical Models -Generalized Linear Models- November, 2008 This exercise concerns the analysis of low birth weight data. This is of interest due to the fact that infant mortality rates and birth defect rates are very high for low birth weight babies. A woman's behavior during pregnancy

257

Digital photorefraction  

NASA Astrophysics Data System (ADS)

The early evaluation of the visual status of human infants is of a critical importance. It is of utmost importance to the development of the child's visual system that she perceives clear, focused, retinal images. Furthermore if the refractive problems are not corrected in due time amblyopia may occur. Photorefraction is a non-invasive clinical tool rather convenient for application to this kind of population. A qualitative or semi-quantitative information about refractive errors, accommodation, strabismus, amblyogenic factors and some pathologies (cataracts) can the easily obtained. The photorefraction experimental setup we established using new technological breakthroughs on the fields of imaging devices, image processing and fiber optics, allows the implementation of both the isotropic and eccentric photorefraction approaches. Essentially both methods consist on delivering a light beam into the eyes. It is refracted by the ocular media, strikes the retina, focusing or not, reflects off and is collected by a camera. The system is formed by one CCD color camera and a light source. A beam splitter in front of the camera's objective allows coaxial illumination and observation. An optomechanical system also allows eccentric illumination. The light source is a flash type one and is synchronized with the camera's image acquisition. The camera's image is digitized displayed in real time. Image processing routines are applied for image's enhancement and feature extraction.

Costa, Manuel F. M.; Jorge, Jorge M.

1998-01-01

258

Digital photorefraction  

NASA Astrophysics Data System (ADS)

The early evaluation of the visual status of human infants is of a critical importance. It is of utmost importance to the development of the child's visual system that she perceives clear, focused, retinal images. Furthermore if the refractive problems are not corrected in due time amblyopia may occur. Photorefraction is a non-invasive clinical tool rather convenient for application to this kind of population. A qualitative or semi-quantitative information about refractive errors, accommodation, strabismus, amblyogenic factors and some pathologies (cataracts) can the easily obtained. The photorefraction experimental setup we established using new technological breakthroughs on the fields of imaging devices, image processing and fiber optics, allows the implementation of both the isotropic and eccentric photorefraction approaches. Essentially both methods consist on delivering a light beam into the eyes. It is refracted by the ocular media, strikes the retina, focusing or not, reflects off and is collected by a camera. The system is formed by one CCD color camera and a light source. A beam splitter in front of the camera's objective allows coaxial illumination and observation. An optomechanical system also allows eccentric illumination. The light source is a flash type one and is synchronized with the camera's image acquisition. The camera's image is digitized displayed in real time. Image processing routines are applied for image's enhancement and feature extraction.

Costa, Manuel F.; Jorge, Jorge M.

1997-12-01

259

New Horizons Digital Age  

E-print Network

New Horizons for the Digital Age York University Libraries' 2012-2015 Strategic Plan #12;New Horizons for the Digital Age This Strategic Plan, New Horizons for the Digital Age, describes York' 2012-2015 Strategic Plan: New Horizons for the Digital Age reflects the importance of these emergent

260

H. Sapiens Digital: From Digital Immigrants and Digital Natives to Digital Wisdom  

ERIC Educational Resources Information Center

As we move further into the 21st century, the digital native/digital immigrant paradigm created by Marc Prensky in 2001 is becoming less relevant. In this article, Prensky suggests that we should focus instead on the development of what he calls "digital wisdom." Arguing that digital technology can make us not just smarter but truly wiser, Prensky…

Prensky, Marc

2009-01-01

261

Weights and measures  

NSDL National Science Digital Library

This virtual museum presents the role of the United States government in the development and standardization of weights and measures. Produced by the National Institute of Standards and Technology (NIST), the exhibit displays objects in eight virtual rooms: America Before Standard Weights and Measures; Ferdinand Rudolph Hassler; The Office of Weights and Measures in the Coast and Geodetic Survey, 1836-1901; The Mendenhall Order; The Founding of the National Bureau of Standards in 1901; From Artifacts to Physical Constants; The Dissemination of Standard Weights and Measures; and A Social History of Weights and Measures. Text as well as images relate the history.

Lisa Greenhouse

2001-01-01

262

Kriging without negative weights  

SciTech Connect

Under a constant drift, the linear kriging estimator is considered as a weighted average of n available sample values. Kriging weights are determined such that the estimator is unbiased and optimal. To meet these requirements, negative kriging weights are sometimes found. Use of negative weights can produce negative block grades, which makes no practical sense. In some applications, all kriging weights may be required to be nonnegative. In this paper, a derivation of a set of nonlinear equations with the nonnegative constraint is presented. A numerical algorithm also is developed for the solution of the new set of kriging equations.

Szidarovszky, F.; Baafi, E.Y.; Kim, Y.C.

1987-08-01

263

Application of digital/electric systems to advanced technology aircraft  

NASA Technical Reports Server (NTRS)

Potential improvements in weight and performance of the digital/electric airplane of the 1990s are investigated, using data based on the Integrated Digital/Electric Airplane (IDEA) study, a nine-month investigation of integrated digital/electric concepts. A baseline configuration was compared to these IDEA configurations in terms of economic performance, fuel efficiency, and significant system and aircraft configuration characteristics. The 1990 baseline configuration represents a six to eight percent performance improvement over current technology; however, the IDEA airplane shows an additional three percent improvement in fuel burn performance. This improvement is due to a reduction of over 3000 pounds in systems weight alone.

Bailey, A. R.

1985-01-01

264

Assessment of delay-and-sum algorithms for damage detection in aluminium and composite plates  

NASA Astrophysics Data System (ADS)

Piezoelectric sensors are increasingly being used in active structural health monitoring, due to their durability, light weight and low power consumption. In the present work damage detection and characterization methodologies based on Lamb waves have been evaluated for aircraft panels. The applicability of various proposed delay-and-sum algorithms on isotropic and composite stiffened panels have been investigated, both numerically and experimentally. A numerical model for ultrasonic wave propagation in composite laminates is proposed and compared to signals recorded from experiments. A modified delay-and-sum algorithm is then proposed for detecting impact damage in composite plates with and without a stiffener which is shown to capture and localize damage with only four transducers.

Sharif-Khodaei, Z.; Aliabadi, M. H.

2014-07-01

265

Photonuclear sum rules and the tetrahedral configuration of {sup 4}He  

SciTech Connect

Three well-known photonuclear sum rules (SR), i.e., the Thomas-Reiche-Kuhn, the bremsstrahlungs and the polarizability SR are calculated for {sup 4}He with the realistic nucleon-nucleon potential Argonne V18 and the three-nucleon force Urbana IX. The relation between these sum rules and the corresponding energy weighted integrals of the cross section is discussed. Two additional equivalences for the bremsstrahlungs SR are given, which connect it to the proton-neutron and neutron-neutron distances. Using them, together with our result for the bremsstrahlungs SR, we find a deviation from the tetrahedral symmetry of the spatial configuration of {sup 4}He. The possibility to access this deviation experimentally is discussed.

Gazit, Doron; Barnea, Nir [Racah Institute of Physics, Hebrew University, 91904 Jerusalem (Israel); Bacca, Sonia [Gesellschaft fuer Schwerionenforschung, Planckstr. 1, D-64291 Darmstadt (Germany); Leidemann, Winfried; Orlandini, Giuseppina [Department of Physics, George Washington University, Washington DC 20052 (United States); Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Trento (Italy)

2006-12-15

266

Scattering and; Delay, Scale, and Sum Migration  

SciTech Connect

How do we see? What is the mechanism? Consider standing in an open field on a clear sunny day. In the field are a yellow dog and a blue ball. From a wave-based remote sensing point of view the sun is a source of radiation. It is a broadband electromagnetic source which, for the purposes of this introduction, only the visible spectrum is considered (approximately 390 to 750 nanometers or 400 to 769 TeraHertz). The source emits an incident field into the known background environment which, for this example, is free space. The incident field propagates until it strikes an object or target, either the yellow dog or the blue ball. The interaction of the incident field with an object results in a scattered field. The scattered field arises from a mis-match between the background refractive index, considered to be unity, and the scattering object refractive index ('yellow' for the case of the dog, and 'blue' for the ball). This is also known as an impedance mis-match. The scattering objects are referred to as secondary sources of radiation, that radiation being the scattered field which propagates until it is measured by the two receivers known as 'eyes'. The eyes focus the measured scattered field to form images which are processed by the 'wetware' of the brain for detection, identification, and localization. When time series representations of the measured scattered field are available, the image forming focusing process can be mathematically modeled by delayed, scaled, and summed migration. This concept of optical propagation, scattering, and focusing have one-to-one equivalents in the acoustic realm. This document is intended to present the basic concepts of scalar scattering and migration used in wide band wave-based remote sensing and imaging. The terms beamforming and (delayed, scaled, and summed) migration are used interchangeably but are to be distinguished from the narrow band (frequency domain) beamforming to determine the direction of arrival of a signal, and seismic migration in which wide band time series are shifted but not to form images per se. Section 3 presents a mostly graphically-based motivation and summary of delay, scale, and sum beamforming. The model for incident field propagation in free space is derived in Section 4 under specific assumptions. General object scattering is derived in Section 5 and simplified under the Born approximation in Section 6. The model of this section serves as the basis in the derivation of time-domain migration. The Foldy-Lax, full point scatterer scattering, method is derived in Section 7. With the previous forward models in hand, delay, scale, and sum beamforming is derived in Section 8. Finally, proof-of-principle experiments are present in Section 9.

Lehman, S K

2011-07-06

267

Weighted Laplacians, cocycles and recursion relations  

NASA Astrophysics Data System (ADS)

Hodge's formula represents the gravitational MHV amplitude as the determinant of a minor of a certain matrix. When expanded, this determinant becomes a sum over weighted trees, which is the form of the MHV formula first obtained by Bern, Dixon, Perelstein, Rozowsky and rediscovered by Nguyen, Spradlin, Volovich and Wen. The gravity MHV amplitude satisfies the Britto, Cachazo, Feng and Witten recursion relation. The main building block of the MHV amplitude, the so-called half-soft function, satisfies a different, Berends-Giele-type recursion relation. We show that all these facts are illustrations to a more general story. We consider a weighted Laplacian for a complete graph of n vertices. The matrix tree theorem states that its diagonal minor determinants are all equal and given by a sum over spanning trees. We show that, for any choice of a cocycle on the graph, the minor determinants satisfy a Berends-Giele as well as Britto-Cachazo-Feng-Witten type recursion relation. Our proofs are purely combinatorial.

Krasnov, Kirill; Scarinci, Carlos

2013-11-01

268

Exponential Approximations Using Fourier Series Partial Sums  

NASA Technical Reports Server (NTRS)

The problem of accurately reconstructing a piece-wise smooth, 2(pi)-periodic function f and its first few derivatives, given only a truncated Fourier series representation of f, is studied and solved. The reconstruction process is divided into two steps. In the first step, the first 2N + 1 Fourier coefficients of f are used to approximate the locations and magnitudes of the discontinuities in f and its first M derivatives. This is accomplished by first finding initial estimates of these quantities based on certain properties of Gibbs phenomenon, and then refining these estimates by fitting the asymptotic form of the Fourier coefficients to the given coefficients using a least-squares approach. It is conjectured that the locations of the singularities are approximated to within O(N(sup -M-2), and the associated jump of the k(sup th) derivative of f is approximated to within O(N(sup -M-l+k), as N approaches infinity, and the method is robust. These estimates are then used with a class of singular basis functions, which have certain 'built-in' singularities, to construct a new sequence of approximations to f. Each of these new approximations is the sum of a piecewise smooth function and a new Fourier series partial sum. When N is proportional to M, it is shown that these new approximations, and their derivatives, converge exponentially in the maximum norm to f, and its corresponding derivatives, except in the union of a finite number of small open intervals containing the points of singularity of f. The total measure of these intervals decreases exponentially to zero as M approaches infinity. The technique is illustrated with several examples.

Banerjee, Nana S.; Geer, James F.

1997-01-01

269

Digital adaptive flight controller development  

NASA Technical Reports Server (NTRS)

A design study of adaptive control logic suitable for implementation in modern airborne digital flight computers was conducted. Two designs are described for an example aircraft. Each of these designs uses a weighted least squares procedure to identify parameters defining the dynamics of the aircraft. The two designs differ in the way in which control law parameters are determined. One uses the solution of an optimal linear regulator problem to determine these parameters while the other uses a procedure called single stage optimization. Extensive simulation results and analysis leading to the designs are presented.

Kaufman, H.; Alag, G.; Berry, P.; Kotob, S.

1974-01-01

270

Modifying the sum over topological sectors and constraints on supergravity  

Microsoft Academic Search

The standard lore about the sum over topological sectors in quantum field theory is that locality and cluster decomposition\\u000a uniquely determine the sum over such sectors, thus leading to the usual ?-vacua. We show that without changing the local degrees of freedom, a theory can be modified such that the sum over instantons\\u000a should be restricted; e.g. one should include

Nathan Seiberg

2010-01-01

271

Small size pentaquark in QCD sum rule approach  

E-print Network

The analysis of the sum rules (for two differentchoices of 5-quark currents) indicate that to explain experimental results it is necessary to have some one-particle lower state (and pentaquark is a reliable candidate to this state) while the two-particle coupled lower state ($NK$ system) should be excluded. Obtained sum rules have good stability and correspond to pentaquark mass $m_\\theta$=1.54 $GeV$ at the appropriate choice of continuum threshold. Also the features of the sum rules for 2-point correlator with 5-quark currents are studied. This features should be taken into account to obtain sum rules correctly.

A. G. Oganesian

2005-10-25

272

Two-Dimensional State Sum Models and Spin Structures  

NASA Astrophysics Data System (ADS)

The state sum models in two dimensions introduced by Fukuma, Hosono and Kawai are generalised by allowing algebraic data from a non-symmetric Frobenius algebra. Without any further data, this leads to a state sum model on the sphere. When the data is augmented with a crossing map, the partition function is defined for any oriented surface with a spin structure. An algebraic condition that is necessary for the state sum model to be sensitive to spin structure is determined. Some examples of state sum models that distinguish topologically-inequivalent spin structures are calculated.

Barrett, John W.; Tavares, Sara O. G.

2014-12-01

273

Efficient Cryptographic Schemes Provably as Secure as Subset Sum \\Lambda  

E-print Network

Efficient Cryptographic Schemes Provably as Secure as Subset Sum \\Lambda Russell Impagliazzo y. Finally, although considered unlikely, it is possible that feasible algorithms for these number theoretic

Wang, Deli

274

T-adic exponential sums over finite fields  

Microsoft Academic Search

$T$-adic exponential sums associated to a Laurent polynomial $f$ are\\u000aintroduced. They interpolate all classical $p^m$-power order exponential sums\\u000aassociated to $f$. The Hodge bound for the Newton polygon of $L$-functions of\\u000a$T$-adic exponential sums is established. This bound enables us to determine,\\u000afor all $m$, the Newton polygons of $L$-functions of $p^m$-power order\\u000aexponential sums associated to an $f$

Chunlei Liu; Daqing Wan

2009-01-01

275

National Center for Digital Government National Center for Digital Government  

E-print Network

National Center for Digital Government National Center for Digital Government University Center for Digital Government welcomed a delegation of government and technology business leaders from Kazakhstan on Wednesday, September 26, 2007. Amherst, MA­ The National Center for Digital Government (NCDG

Schweik, Charles M.

276

The Effect of Electronic Self-Monitoring on Weight Loss and Dietary Intake: A Randomized Behavioral Weight Loss Trial  

Microsoft Academic Search

Technology may improve self-monitoring adherence and dietary changes in weight loss treatment. Our study aimed to investigate whether using a personal digital assistant (PDA) with dietary and exercise software, with and without a feedback message, compared to using a paper diary\\/record (PR), results in greater weight loss and improved self-monitoring adherence. Healthy adults (N = 210) with a mean BMI

Lora E. Burke; Molly B. Conroy; Susan M. Sereika; Okan U. Elci; Mindi A. Styn; Sushama D. Acharya; Mary A. Sevick; Linda J. Ewing; Karen Glanz

2011-01-01

277

Weight Stigmatization in Children  

Microsoft Academic Search

This study was designed to examine weight stigmatization among Hispanic American children. Fifty-five fifth grade students from a large, urban school district in Southern California were asked to rank six same- sex drawings of children with various physical characteristics (related to weight or disability) in order of friend preference (1 = the most preferred, and 6 = the least preferred

Melissa L. Wigginton; Lenny D. Wiersma; Clay P. Sherman; Daniela Rubin

2009-01-01

278

Nutrition During Weight Gain  

E-print Network

, Department of Food Science and Human Nutrition, 3/09 MSU is an affirmative-action, equal-opportunity employerNutrition During Pregnancy Weight Gain: The right weight gain (not too little and not too much you are taking, such as vitamins, minerals or herbs. Nutrition during pregnancy is very important

279

Marijuana and Body Weight  

PubMed Central

Acute marijuana use is classically associated with snacking behavior (colloquially referred to as “the munchies”). In support of these acute appetite-enhancing effects, several authorities report that marijuana may increase body mass index in patients suffering from human immunodeficiency virus and cancer. However, for these medical conditions, while appetite may be stimulated, some studies indicate that weight gain is not always clinically meaningful. In addition, in a study of cancer patients in which weight gain did occur, it was less than the comparator drug (megestrol). However, data generally suggest that acute marijuana use stimulates appetite, and that marijuana use may stimulate appetite in low-weight individuals. As for large epidemiological studies in the general population, findings consistently indicate that users of marijuana tend to have lower body mass indices than nonusers. While paradoxical and somewhat perplexing, these findings may be explained by various study confounds, such as potential differences between acute versus chronic marijuana use; the tendency for marijuana use to be associated with other types of drug use; and/or the possible competition between food and drugs for the same reward sites in the brain. Likewise, perhaps the effects of marijuana are a function of initial weight status—i.e., maybe marijuana is a metabolic regulatory substance that increases body weight in low-weight individuals but not in normal-weight or overweight individuals. Only further research will clarify the complex relationships between marijuana and body weight. PMID:25337447

Sansone, Lori A.

2014-01-01

280

Coins with Arbitrary Weights  

Microsoft Academic Search

Given a set of m coins out of a collection of coins of k unknown distinct weights, we wish to decide if all the m given coins have the same weight or not using the minimum possible number of weighings in a regular balance beam. Let m(n;k) denote the maximum possible number of coins for which the above problem can

Noga Alon; Dmitry N. Kozlov

1997-01-01

281

Mathematics in Weighting.  

ERIC Educational Resources Information Center

Presents the template method developed by Galileo for calculating areas of geometric shapes constructed of uniform density and thickness. The method compares the weight of a shape of known area to the weight of a shape of unknown area. Applies this hands-on method to problems involving calculus, Pythagorean's theorem, and cycloids. (MDH)

Francis, Richard L.

1992-01-01

282

Digital Divide: Navigating the Digital Edge  

Microsoft Academic Search

This article considers how the digital media lives of Latino and African American youth are evolving. Latino and African American youth are just as likely as their white and Asian America counterparts to go online, manage a social networking site, and use a mobile phone. The shifting digital media practices of black and Latino youth raise crucial questions and suggest

S. Craig Watkins

2011-01-01

283

Digital FIR Filtering Options for CARMA Digitizers  

Microsoft Academic Search

Design possibilities are examined for the implementation of narrowband CARMA spectral- line modes using digital filtering techniques. The model designs are based on an analog pre- filter followed by one or more stages of digital filtering and decimation that narrow and shape the input analog bandpass to create the desired observing window. The pre-filter is the same one used to

Kevin P. Rauch

284

Weight discrimination and bullying.  

PubMed

Despite significant attention to the medical impacts of obesity, often ignored are the negative outcomes that obese children and adults experience as a result of stigma, bias, and discrimination. Obese individuals are frequently stigmatized because of their weight in many domains of daily life. Research spanning several decades has documented consistent weight bias and stigmatization in employment, health care, schools, the media, and interpersonal relationships. For overweight and obese youth, weight stigmatization translates into pervasive victimization, teasing, and bullying. Multiple adverse outcomes are associated with exposure to weight stigmatization, including depression, anxiety, low self-esteem, body dissatisfaction, suicidal ideation, poor academic performance, lower physical activity, maladaptive eating behaviors, and avoidance of health care. This review summarizes the nature and extent of weight stigmatization against overweight and obese individuals, as well as the resulting consequences that these experiences create for social, psychological, and physical health for children and adults who are targeted. PMID:23731874

Puhl, Rebecca M; King, Kelly M

2013-04-01

285

Digital second-order phase-locked loop  

NASA Technical Reports Server (NTRS)

A digital second-order phase-locked loop is disclosed in which a counter driven by a stable clock pulse source is used to generate a reference waveform of the same frequency as an incoming waveform, and to sample the incoming waveform at zero-crossover points. The samples are converted to digital form and accumulated over M cycles, reversing the sign of every second sample. After every M cycles, the accumulated value of samples is hard limited to a value SGN = + or - 1 and multiplied by a value delta sub 1 equal to a number of n sub 1 of fractions of a cycle. An error signal is used to advance or retard the counter according to the sign of the sum by an amount equal to the sum.

Holes, J. K.; Carl, C.; Tegnelia, C. R. (inventors)

1973-01-01

286

Weighted Schur-class functions and functional models  

Microsoft Academic Search

We generalize the class of contractive-valued functions analytic in the unit disk (Schur class) to the case of finitely connected\\u000a domains with operator-valued weights on the boundary. The two fundamental decompositions (the inner-outer factorization and\\u000a the decomposition into the orthogonal sum of the pure and unitary parts) are extended to our setting. This generalization\\u000a allows one to use a uniform

A. S. Tikhonov

2008-01-01

287

Digital Video, Digital TV IMPA -Instituto de Matemtica Pura e  

E-print Network

1 Digital Video, Digital TV and Beyond Luiz Velho IMPA - Instituto de Matemática Pura e Aplicada 2 Outline Video in the Digital Age Deployment of Digital Video Enabling Technologies Research @ VISGRAF Laboratory Trends and the Future... 3 Evolution of Digital Video 1st Generation - Analog / Digital Conversion

288

Digital Library Curriculum collection  

NSDL National Science Digital Library

The Digital Library Curriculum collection contains modules that form the basis for one or a several courses on digital libraries - thus constituting a unified curriculum for the field. They also can be used in computer science, library science, information science, and other programs for other types of courses or as supplements to an existing course. Core topics include digital objects, collection development, knowledge organization, architecture, user behavior and interactions, servics, preservation, management and evaluation and digital library education and research.

2011-01-04

289

A digital frequency synthesizer  

Microsoft Academic Search

A digital frequency synthesizer has been designed and constructed based on generating digital samples ofexp [j(2^{pi}nk\\/N)]at timenT. The real and imaginary parts of this exponential form samples of quadrature sinusoids where the frequency indexkis allowed to vary(-N\\/4) leq K < (N\\/4). The digital samples drive digital to analog converters followed by low-pass interpolating filters to produce analog sinusoids. The method

JOSEPH TIERNEY; CHARLES M. RADER; B. Gold

1971-01-01

290

User Manual 601 Digital Video  

E-print Network

User Manual TDS3SDI 601 Digital Video Application Module 071-0787-00 *P071078700* 071078700 #12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The 601 Digital Video Module 13. . . . . . . . . . . . . . . . . . 601 Digital Video Conventions 14. . . . . . . . . . . . . . . . . . Accessing 601 Digital Video Functions 15. . . . . . . . . . . Menu Changes 19

Kleinfeld, David

291

Interference Avoidance and Sum Capacity for Multibase Systems  

Microsoft Academic Search

We derive sum capacity bounds for systems with L transmitting locations, B receiving stations and a signal space of dimension N under the assumption that all received signals are pooled at a central location for processing. In addition, we provide an algorithm based on interference avoidance methods which monotonically increases sum capacity to its maximum value.

Otilia Popescu; Christopher Rose

2001-01-01

292

Second sum rule for the hot plasma permittivity  

SciTech Connect

Based on linear response theory, Kramers-Kronig relations, and diagram techniques of perturbation theory, it is shown that the second sum rule is satisfied for hot plasma permittivity. An explicit analytical expression for the second sum rule in the limit of weak nonideality is derived.

Bobrov, V. B.; Mendeleyev, V. Ya.; Skovorod'ko, S. N.; Trigger, S. A. [Joint Institute for High Temperatures, Russian Academy of Sciences, 13/19, Izhorskaia Street, Moscow 125412 (Russian Federation)

2011-02-15

293

Generating matrix and sums of Fibonacci and Pell sequences  

NASA Astrophysics Data System (ADS)

In this paper, we study the Fibonacci sequence and Pell sequence and developed generating matrices for them. First we proved two results on the even sum of the Fibonacci sequence and the Pell sequence, using the generating matrix approach. We then deduce the odd sums, some identities and recursive formulas for these two sequences.

Ho, C. K.; Woon, H. S.; Chong, Chin-Yoon

2014-07-01

294

Finding Sums for an Infinite Class of Alternating Series  

ERIC Educational Resources Information Center

Calculus II students know that many alternating series are convergent by the Alternating Series Test. However, they know few alternating series (except geometric series and some trivial ones) for which they can find the sum. In this article, we present a method that enables the students to find sums for infinitely many alternating series in the…

Chen, Zhibo; Wei, Sheng; Xiao, Xuerong

2012-01-01

295

An Electrophysiological Signature of Summed Similarity in Visual Working Memory  

ERIC Educational Resources Information Center

Summed-similarity models of short-term item recognition posit that participants base their judgments of an item's prior occurrence on that item's summed similarity to the ensemble of items on the remembered list. We examined the neural predictions of these models in 3 short-term recognition memory experiments using electrocorticographic/depth…

van Vugt, Marieke K.; Sekuler, Robert; Wilson, Hugh R.; Kahana, Michael J.

2013-01-01

296

College Sports: The Mystery of the Zero-Sum Game  

ERIC Educational Resources Information Center

In recent years, when a university may earn well over $10 million per year from fees for sports-broadcast rights, half of the teams still lose. Collegiate athletic competition is a zero sum game: The number of winners equals the number of losers. So why do universities spend growing sums of scarce resources on an activity when the odds of winning…

Getz, Malcolm; Siegfried, John J.

2012-01-01

297

Embeddings of topological graphs: Lossy invariants, linearization, and 2sums  

E-print Network

Embeddings of topological graphs: Lossy invariants, linearization, and 2­sums Amit Chakrabarti that in every multi­commodity flow instance on such a graph, one can route a maximum concurrent flow whose value is closed under taking 2­sums, then members of G embed non­trivially into non­ contracting distributions

Lee, James R.

298

Embeddings of topological graphs: Lossy invariants, linearization, and 2-sums  

E-print Network

Embeddings of topological graphs: Lossy invariants, linearization, and 2-sums Amit Chakrabarti, Rabinovich, and Sinclair, and improving over their upper bound of 14. This shows that in every multi-commodity taking 2-sums, then members of G embed non-trivially into non- contracting distributions over members

Lee, James R.

299

Generalised extreme value statistics and sum of correlated variables  

Microsoft Academic Search

We show that generalised extreme value statistics -the statistics of the kth largest value among a large set of random variables- can be mapped onto a problem of random sums. This allows us to identify classes of non-identical and (generally) correlated random variables with a sum distributed according to one of the three (k-dependent) asymptotic distributions of extreme value statistics,

Eric Bertin; Maxime Clusel

300

Endomorphisms of countable direct sums of torsion complete groups  

Microsoft Academic Search

This paper is a further study of those abelian p-groups G whose ring of endomorphisms is generated by its group of automorphisms. It was shown in [1 ] that if G is a direct sum of countable p-groups or a torsion complete p-group, p # 2, then each endomorphism of G was a sum of two automorphisms of G. In

F. Castagna

1972-01-01

301

Digital Language Death  

PubMed Central

Of the approximately 7,000 languages spoken today, some 2,500 are generally considered endangered. Here we argue that this consensus figure vastly underestimates the danger of digital language death, in that less than 5% of all languages can still ascend to the digital realm. We present evidence of a massive die-off caused by the digital divide. PMID:24167559

Kornai, András

2013-01-01

302

Bridging the Digital Divide  

ERIC Educational Resources Information Center

As the Government publishes its action plan for consultation on digital inclusion, the authors consider some of the challenges and opportunities for the delivery of digital inclusion. Clarke argues that digital inclusion requires more than access to technology or the skills to use it effectively, it demands information and media literacy. Milner…

Clarke, Alan; Milner, Helen; Killer, Terry; Dixon, Genny

2008-01-01

303

Journal of Digital Information  

NSDL National Science Digital Library

The Journal of Digital Information is an electronic-only, peer-reviewed journal covering topics related to digital libraries, hypertext and hypermedia systems, and the issues of digital information. The journal's main page features links to articles in the current issue; previous issues are browseable by issue number, author, title, or theme. They may also be searched by keywords in title or text.

304

Interactive Digital Signal Processor  

NASA Technical Reports Server (NTRS)

Interactive Digital Signal Processor, IDSP, consists of set of time series analysis "operators" based on various algorithms commonly used for digital signal analysis. Processing of digital signal time series to extract information usually achieved by applications of number of fairly standard operations. IDSP excellent teaching tool for demonstrating application for time series operators to artificially generated signals.

Mish, W. H.

1985-01-01

305

Secure Digital Camera  

Microsoft Academic Search

In this paper, we propose a biometric solution to solve some of the significant problems associated with use of digital camera images as evidence in a court of law. We present a lossless watermarking solution to the problems associated with digital image integrity and the relationship to its chain of custody. The integrity of digital images as evidence rests on

Paul Blythe; Jessica Fridrich

306

Y(2175) state in the QCD sum rule  

SciTech Connect

We study the mass of the state Y(2175) of J{sup PC}=1{sup --} in the QCD sum rule. We construct both the diquark-antidiquark currents (ss)(ss) and the meson-meson currents (ss)(ss). We find that there are two independent currents for both cases and derive the relations between them. The operator product expansion convergence of these two currents is sufficiently fast, which enables us to perform good sum rule analysis. Both the SVZ (Shifman-Vainshtein-Zakharov) sum rule and the finite energy sum rule lead to a mass around 2.3{+-}0.4 GeV, which is consistent with the observed mass within the uncertainties of the present QCD sum rule. The coupling of the four-quark currents to lower lying states such as {phi}(1020) turns out to be rather small. We also discuss possible decay properties of Y(2175) if it is a tetraquark state.

Chen Huaxing [Department of Physics, Peking University, Beijing 100871 (China); Research Center for Nuclear Physics, Osaka University, Ibaraki 567-0047 (Japan); Liu Xiang; Zhu Shilin [Department of Physics, Peking University, Beijing 100871 (China); Hosaka, Atsushi [Research Center for Nuclear Physics, Osaka University, Ibaraki 567-0047 (Japan)

2008-08-01

307

Sums of variables at the onset of chaos  

NASA Astrophysics Data System (ADS)

We explain how specific dynamical properties give rise to the limit distribution of sums of deterministic variables at the transition to chaos via the period-doubling route. We study the sums of successive positions generated by an ensemble of initial conditions uniformly distributed in the entire phase space of a unimodal map as represented by the logistic map. We find that these sums acquire their salient, multiscale, features from the repellor preimage structure that dominates the dynamics toward the attractors along the period-doubling cascade. And we explain how these properties transmit from the sums to their distribution. Specifically, we show how the stationary distribution of sums of positions at the Feigebaum point is built up from those associated with the supercycle attractors forming a hierarchical structure with multifractal and discrete scale invariance properties.

Fuentes, Miguel Angel; Robledo, Alberto

2014-02-01

308

An Efficient Algorithm for Maximizing Range Sum Queries in a Road Network  

PubMed Central

Given a set of positive-weighted points and a query rectangle r (specified by a client) of given extents, the goal of a maximizing range sum (MaxRS) query is to find the optimal location of r such that the total weights of all the points covered by r are maximized. All existing methods for processing MaxRS queries assume the Euclidean distance metric. In many location-based applications, however, the motion of a client may be constrained by an underlying (spatial) road network; that is, the client cannot move freely in space. This paper addresses the problem of processing MaxRS queries in a road network. We propose the external-memory algorithm that is suited for a large road network database. In addition, in contrast to the existing methods, which retrieve only one optimal location, our proposed algorithm retrieves all the possible optimal locations. Through simulations, we evaluate the performance of the proposed algorithm. PMID:25152915

Jung, HaRim; Kim, Ung-Mo

2014-01-01

309

A novel weighted-direction color interpolation  

NASA Astrophysics Data System (ADS)

A digital camera capture images by covering the sensor surface with a color filter array (CFA), only get a color sample at pixel location. Demosaicking is a process by estimating the missing color components of each pixel to get a full resolution image. In this paper, a new algorithm based on edge adaptive and different weighting factors is proposed. Our method can effectively suppress undesirable artifacts. Experimental results based on Kodak images show that the proposed algorithm obtain higher quality images compared to other methods in numerical and visual aspects.

Tao, Jin-you; Yang, Jianfeng; Xue, Bin; Liang, Xiaofen; Qi, Yong-hong; Wang, Feng

2013-08-01

310

Your Child's Weight  

MedlinePLUS

... spurts in height and weight gain in both boys and girls. Once these changes start, they continue for several ... or obese. Different BMI charts are used for boys and girls under the age of 20 because the amount ...

311

Mass and Weight Lesson  

NSDL National Science Digital Library

This exercise is designed to look at the difference between mass and weight, and to move students from a misconception of objects in space being weightless to objects in space being in free fall, and experiencing microgravity.

Joiner, David; The Shodor Education Foundation, Inc.

312

Assessing Your Weight  

MedlinePLUS

... see About Adult BMI About Adult BMI . Waist Circumference Another way to assess your weight is to ... conditions if you are: A man whose waist circumference is more than 40 inches A non-pregnant ...

313

Basics of Weight Control  

MedlinePLUS

... 2 Standard Handouts • S01 Version 5.0 The Basics of Weight Control A calorie is a unit ... beverages you drink provide energy and nutrients. The basic required nutrients are: water, carbohydrates, proteins, fats, dietary ...

314

Weight Loss Nutritional Supplements  

Microsoft Academic Search

\\u000a Obesity has reached what may be considered epidemic proportions in the United States, not only for adults but for children.\\u000a Because of the medical implications and health care costs associated with obesity, as well as the negative social and psychological\\u000a impacts, many individuals turn to nonprescription nutritional weight loss supplements hoping for a quick fix, and the weight\\u000a loss industry

Joan M. Eckerson

315

Digital rights management for digital cinema  

NASA Astrophysics Data System (ADS)

There is a wide consensus among the feature film production studios that the Internet era brings a new paradigm for film distribution to cinemas worldwide. The benefits of digital cinema to both producers and cinemas are numerous: significantly lower distribution and maintenance costs, immediate access to film libraries, higher presentation quality, and strong potential for developing new business models. Despite these advantages, the studios are still reluctant to jump into the digital age. The main showstopper for digital cinema is the danger of widespread piracy. Piracy already costs Hollywood an estimated two billion dollars annually and digital cinema without proper copyright enforcement could increase this number. In this paper, we present a copyright management system that aims at providing the set of necessary security tools: standard cryptographic primitives and copyright protection mechanisms that enable a reliable and secure feature film delivery system.

Kirovski, Darko; Peinado, Marcus; Petitcolas, Fabien A. P.

2001-12-01

316

Algorithms to evaluate multiple sums for loop computations  

NASA Astrophysics Data System (ADS)

We present algorithms to evaluate two types of multiple sums, which appear in higher-order loop computations. We consider expansions of a generalized hyper-geometric-type sums, sum _{n_1,\\cdots,n_N} ? ({a}_1\\cdot {n}+c_1) ? ({a}_2\\cdot {n}+c_2) \\cdots ? ({a}_P\\cdot {n}+c_P) / ? ({b_1\\cdot {n}+d_1) ? ({b}_2\\cdot {n}+d_2) \\cdots ? ({b}_Q\\cdot {n}+d_Q) } x_1^{n_1}\\cdots x_N^{n_N} with {a}_i \\cdot {n} = sum _{j=1}^N a_{ij}n_j, etc., in a small parameter ? around rational values of ci,di's. Type I sum corresponds to the case where, in the limit ? ? 0, the summand reduces to a rational function of nj's times x_1^{n_1}\\cdots x_N^{n_N}; ci,di's can depend on an external integer index. Type II sum is a double sum (N = 2), where ci, di's are half-integers or integers as ? ? 0 and xi = 1; we consider some specific cases where at most six ? functions remain in the limit ? ? 0. The algorithms enable evaluations of arbitrary expansion coefficients in ? in terms of Z-sums and multiple polylogarithms (generalized multiple zeta values). We also present applications of these algorithms. In particular, Type I sums can be used to generate a new class of relations among generalized multiple zeta values. We provide a Mathematica package, in which these algorithms are implemented.

Anzai, C.; Sumino, Y.

2013-03-01

317

Digital Curation and Digital Cultural Memory  

Microsoft Academic Search

\\u000a The last two decades have witnessed an ever increasing penetration of digital media initially in the management and, subsequently,\\u000a in the study of culture. From collections management, object documentation, domain knowledge representation and reasoning,\\u000a to supporting the creative synthesis and re-interpretation of data in the framework of digital productions, significant progress\\u000a has been achieved in the development of relevant knowledge

Panos Constantopoulos

2010-01-01

318

The optical sum rule in strongly correlated systems  

SciTech Connect

We discuss the problem of a possible 'violation' of the optical sum rule in the normal (nonsuperconducting) state of strongly correlated electronic systems, using our recently proposed DMFT + {sigma} approach applied to two typical models: the 'hot spot' model of the pseudogap state and the disordered Anderson-Hubbard model. We explicitly demonstrate that the general Kubo single-band sum rule is satisfied for both models, but the optical integral itself is in general dependent on temperature and characteristic parameters, such as the pseudogap width, correlation strength, and disorder scattering, leading to an effective 'violation' of the optical sum rule, which may be observed in experiments.

Kuchinskii, E. Z.; Kuleeva, N. A.; Nekrasov, I. A.; Sadovskii, M. V. [Russian Academy of Sciences, Ural Branch, Institute for Electrophysics (Russian Federation)], E-mail: sadovski@iep.uran.ru

2008-08-15

319

Shear spectral sum rule in a nonconformal gravity dual  

SciTech Connect

A sum rule which relates a stress-energy tensor correlator to thermodynamic functions is examined within the context of a simple nonconformal gravity dual. Such a sum rule was previously derived using AdS/CFT for conformal N=4 supersymmetric Yang-Mills theory, but we show that it does not generalize to the nonconformal theory under consideration. We provide a generalized sum rule and numerically verify its validity. A useful by-product of the calculation is the computation of the spectral density in a strongly coupled nonconformal theory. Qualitative features of the spectral densities and implications for lattice measurements of transport coefficients are discussed.

Springer, Todd; Gale, Charles; Jeon, Sangyong [Department of Physics, McGill University, Montreal, Quebec, H3A2T8 (Canada); Lee, Su Houng [Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749 (Korea, Republic of); Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

2010-11-15

320

A precise sum rule among four B -> Kpi CP asymmetries  

E-print Network

A sum rule relation is proposed for direct CP asymmetries in $B\\to K\\pi$ decays. Leading terms are identical in the isospin symmetry limit, while subleading terms are equal in the flavor SU(3) and heavy quark limits. The sum rule predicts $A_{\\rm CP}(B^0\\to K^0\\pi^0)=-0.17 \\pm 0.06$ using current asymmetry measurements for the other three $B\\to K\\pi$ decays. A violation of the sum rule would be evidence for New Physics in $b\\to s\\bar qq$ transitions.

Michael Gronau

2005-08-03

321

Third-frequency-moment sum rule for electronic multilayers  

SciTech Connect

The authors establish the third-frequency-moment sum rules for the density-density response matrix of electronic multilayer structures modeled as an array of N parallel two-dimensional (2D) electron-plasma monolayers. Layer densities and spacings between adjacent layers need not be equal. Contact is made with previously established sum rules for the isolated 2D electron liquid and type-1 infinite superlattices. The case of the equal-density bilayer is considered and its third frequency-moment-sum-rules for the in-phase and out-of-phase inverse dielectric functions are formulated. (c) 2000 The American Physical Society.

Lu, Dexin [Department for Intensive Instruction, Nanjing University, Nanjing 210093, People's Republic of China (China)] [Department for Intensive Instruction, Nanjing University, Nanjing 210093, People's Republic of China (China); Golden, Kenneth I. [Department of Mathematics and Statistics, Department of Physics, University of Vermont, Burlington, Vermont 05401-1455 (United States)] [Department of Mathematics and Statistics, Department of Physics, University of Vermont, Burlington, Vermont 05401-1455 (United States)

2000-01-01

322

An 8×8 Row-Column Summing Readout Electronics for Preclinical Positron Emission Tomography Scanners.  

PubMed

This work presents a row/column summing readout electronics for an 8×8 silicon photomultiplier array. The summation circuit greatly reduces the number of electronic channels, which is desirable for pursuing higher resolution positron emission tomography scanners. By using a degenerated common source topology in the summation circuit, more fan-in is possible and therefore a greater reduction in the number of electronic channels can be achieved. The timing signal is retrieved from a common anode, which allows the use of a single fast-sampling analog to digital converter (ADC) for the timing channel and slower, lower power ADCs for the 64 spatial channels. Preliminary results of one row summation of the 8×8 readout electronics exhibited FWHM energy resolution of 17.8% and 18.3% with and without multiplexing, respectively. The measured timing resolution is 2.9ns FWHM. PMID:20729983

Shih, Y C; Sun, F W; Macdonald, L R; Otis, B P; Miyaoka, R S; McDougald, W; Lewellen, T K

2009-10-24

323

Weight Loss Nutritional Supplements  

NASA Astrophysics Data System (ADS)

Obesity has reached what may be considered epidemic proportions in the United States, not only for adults but for children. Because of the medical implications and health care costs associated with obesity, as well as the negative social and psychological impacts, many individuals turn to nonprescription nutritional weight loss supplements hoping for a quick fix, and the weight loss industry has responded by offering a variety of products that generates billions of dollars each year in sales. Most nutritional weight loss supplements are purported to work by increasing energy expenditure, modulating carbohydrate or fat metabolism, increasing satiety, inducing diuresis, or blocking fat absorption. To review the literally hundreds of nutritional weight loss supplements available on the market today is well beyond the scope of this chapter. Therefore, several of the most commonly used supplements were selected for critical review, and practical recommendations are provided based on the findings of well controlled, randomized clinical trials that examined their efficacy. In most cases, the nutritional supplements reviewed either elicited no meaningful effect or resulted in changes in body weight and composition that are similar to what occurs through a restricted diet and exercise program. Although there is some evidence to suggest that herbal forms of ephedrine, such as ma huang, combined with caffeine or caffeine and aspirin (i.e., ECA stack) is effective for inducing moderate weight loss in overweight adults, because of the recent ban on ephedra manufacturers must now use ephedra-free ingredients, such as bitter orange, which do not appear to be as effective. The dietary fiber, glucomannan, also appears to hold some promise as a possible treatment for weight loss, but other related forms of dietary fiber, including guar gum and psyllium, are ineffective.

Eckerson, Joan M.

324

Birth weight: nature or nurture?  

Microsoft Academic Search

Objective: To investigate the relative role of environmental and genetic factors in the determination of birth weight following ovum donation. Methods: Data from 62 cases of ovum donation were used to examine the relative influence of donor and recipient on birth weight. Results: The only discernible factors that significantly influenced birth weight were gestational age and recipient's weight. Donor weight,

A. A. Brooks; M. R. Johnson; P. J. Steer; M. E. Pawson; H. I. Abdalla

1995-01-01

325

Smoking Cessation and Weight Gain.  

ERIC Educational Resources Information Center

Investigated determinants of weight gain after quitting smoking in two smoking treatment outcome studies. Results indicated abstinence resulted in weight gain, and postquitting weight gain was predicted by pretreatment tobacco use, a history of weight problems, and eating patterns. Relapse to smoking did not follow weight gain. (Author/BL)

Hall, Sharon M.; And Others

1986-01-01

326

Lorcaserin for weight management.  

PubMed

Type 2 diabetes and obesity commonly occur together. Obesity contributes to insulin resistance, a main cause of type 2 diabetes. Modest weight loss reduces glucose, lipids, blood pressure, need for medications, and cardiovascular risk. A number of approaches can be used to achieve weight loss, including lifestyle modification, surgery, and medication. Lorcaserin, a novel antiobesity agent, affects central serotonin subtype 2A receptors, resulting in decreased food intake and increased satiety. It has been studied in obese patients with type 2 diabetes and results in an approximately 5.5 kg weight loss, on average, when used for one year. Headache, back pain, nasopharyngitis, and nausea were the most common adverse effects noted with lorcaserin. Hypoglycemia was more common in the lorcaserin groups in the clinical trials, but none of the episodes were categorized as severe. Based on the results of these studies, lorcaserin was approved at a dose of 10 mg twice daily in patients with a body mass index ?30 kg/m(2) or ?27 kg/m(2) with at least one weight-related comorbidity, such as hypertension, type 2 diabetes mellitus, or dyslipidemia, in addition to a reduced calorie diet and increased physical activity. Lorcaserin is effective for weight loss in obese patients with and without type 2 diabetes, although its specific role in the management of obesity is unclear at this time. This paper reviews the clinical trials of lorcaserin, its use from the patient perspective, and its potential role in the treatment of obesity. PMID:23788837

Taylor, James R; Dietrich, Eric; Powell, Jason

2013-01-01

327

Lorcaserin for weight management  

PubMed Central

Type 2 diabetes and obesity commonly occur together. Obesity contributes to insulin resistance, a main cause of type 2 diabetes. Modest weight loss reduces glucose, lipids, blood pressure, need for medications, and cardiovascular risk. A number of approaches can be used to achieve weight loss, including lifestyle modification, surgery, and medication. Lorcaserin, a novel antiobesity agent, affects central serotonin subtype 2A receptors, resulting in decreased food intake and increased satiety. It has been studied in obese patients with type 2 diabetes and results in an approximately 5.5 kg weight loss, on average, when used for one year. Headache, back pain, nasopharyngitis, and nausea were the most common adverse effects noted with lorcaserin. Hypoglycemia was more common in the lorcaserin groups in the clinical trials, but none of the episodes were categorized as severe. Based on the results of these studies, lorcaserin was approved at a dose of 10 mg twice daily in patients with a body mass index ?30 kg/m2 or ?27 kg/m2 with at least one weight-related comorbidity, such as hypertension, type 2 diabetes mellitus, or dyslipidemia, in addition to a reduced calorie diet and increased physical activity. Lorcaserin is effective for weight loss in obese patients with and without type 2 diabetes, although its specific role in the management of obesity is unclear at this time. This paper reviews the clinical trials of lorcaserin, its use from the patient perspective, and its potential role in the treatment of obesity. PMID:23788837

Taylor, James R; Dietrich, Eric; Powell, Jason

2013-01-01

328

Negative-weight percolation  

NASA Astrophysics Data System (ADS)

We describe a percolation problem on lattices (graphs, networks), with edge weights drawn from disorder distributions that allow for weights (or distances) of either sign, i.e. including negative weights. We are interested in whether there are spanning paths or loops of total negative weight. This kind of percolation problem is fundamentally different from conventional percolation problems, e.g. it does not exhibit transitivity, hence, no simple definition of clusters, and several spanning paths/loops might coexist in the percolation regime at the same time. Furthermore, to study this percolation problem numerically, one has to perform a non-trivial transformation of the original graph and apply sophisticated matching algorithms. Using this approach, we study the corresponding percolation transitions on large square, hexagonal and cubic lattices for two types of disorder distributions and determine the critical exponents. The results show that negative-weight percolation (NWP) is in a different universality class compared to conventional bond/site percolation. On the other hand, NWP seems to be related to the ferromagnet/spin-glass transition of random-bond Ising systems, at least in two dimensions.

Melchert, O.; Hartmann, A. K.

2008-04-01

329

Digital Video 1 DIGITAL VIDEO, LEARNING STYLES AND STUDENT UNDERSTANDING  

E-print Network

Digital Video 1 DIGITAL VIDEO, LEARNING STYLES AND STUDENT UNDERSTANDING Digital Video, Learning University in 1997. Her doctoral work involved the assessment of and interactive digital video technique #12;Digital Video 2 teachers, particularly those teachers whose background does not include

Larkin, Teresa L.

330

Calibration method for digital energy meters in digital substations  

Microsoft Academic Search

Digital energy meters are used in digital substations to measure electric energy, which receive IEC 61850 digital input. The traditional calibration methods for analog energy meters are not applicable to digital energy meters. In this paper we propose a method to calibrate digital energy meters.

Hongtao Huang; Lei Wang; Jiangtao Zhang; Xianlin Pan; Zuliang Lu

2010-01-01

331

The Roles of Digital Reference in a Digital Library Environment  

Microsoft Academic Search

Digital reference has become a significant movement in the world of traditional libraries, and increasingly, in the digital library arena. This white paper will present the background for the digital reference movement, highlight current work and research in the area, and provide some examples of how digital reference can be integrated into digital libraries.

R. David Lankes

332

Gossip on Weighted Networks  

E-print Network

We investigate how suitable a weighted network is for gossip spreading. The proposed model is based on the gossip spreading model introduced by Lind et.al. on unweighted networks. Weight represents "friendship." Potential spreader prefers not to spread if the victim of gossip is a "close friend". Gossip spreading is related to the triangles and cascades of triangles. It gives more insight about the structure of a network. We analyze gossip spreading on real weighted networks of human interactions. 6 co-occurrence and 7 social pattern networks are investigated. Gossip propagation is found to be a good parameter to distinguish co-occurrence and social pattern networks. As a comparison some miscellaneous networks and computer generated networks based on ER, BA, WS models are also investigated. They are found to be quite different than the human interaction networks.

Tasgin, Mursel

2012-01-01

333

Light weight phosphate cements  

DOEpatents

A sealant having a specific gravity in the range of from about 0.7 to about 1.6 for heavy oil and/or coal bed methane fields is disclosed. The sealant has a binder including an oxide or hydroxide of Al or of Fe and a phosphoric acid solution. The binder may have MgO or an oxide of Fe and/or an acid phosphate. The binder is present from about 20 to about 50% by weight of the sealant with a lightweight additive present in the range of from about 1 to about 10% by weight of said sealant, a filler, and water sufficient to provide chemically bound water present in the range of from about 9 to about 36% by weight of the sealant when set. A porous ceramic is also disclosed.

Wagh, Arun S. (Naperville, IL); Natarajan, Ramkumar, (Woodridge, IL); Kahn, David (Miami, FL)

2010-03-09

334

Digital work-flow  

PubMed Central

SUMMARY Objective. The project presents a clinical case in which the digital work-flow procedure was applied for a prosthetic rehabilitation in natural teeth and implants. Materials. Digital work-flow uses patient’s photo for the aesthetic’s planning, digital smile technology for the simulation of the final restoration and real time scanning to register the two arches. Than the scanning are sent to the laboratory that proceed with CAD-CAM production. Results. Digital work-flow offers the opportunities to easily speak with laboratory and patients, gives better clinical results and demonstrated to be a less invasiveness method for the patient. Conclusion. Intra-oral scanner, digital smile design, preview using digital wax-up, CAD-CAM production, are new predictable opportunities for prosthetic team. This work-flow, compared with traditional methods, is faster, more precise and predictable.

MARSANGO, V.; BOLLERO, R.; D’OVIDIO, N.; MIRANDA, M.; BOLLERO, P.; BARLATTANI, A.

2014-01-01

335

Generic implementations of parallel prefix sums and its applications  

E-print Network

Parallel prefix sums algorithms are one of the simplest and most useful building blocks for constructing parallel algorithms. A generic implementation is valuable because of the wide range of applications for this method. This thesis presents a...

Huang, Tao

2009-05-15

336

Area Between Two Curves as Limits of Riemann Sums  

NSDL National Science Digital Library

This demo incorporates combines the visualization of approximating rectangles together with a graph of the approximate areas as a function of the number of rectangles. Thus, the limiting behavior of the approximating sums can be observed on the graph.

Roberts, Lila F.; Hill, David R.

2000-05-13

337

Sums of Dependent Nonnegative Random Variables with Subexponential Tails  

E-print Network

Sums of Dependent Nonnegative Random Variables with Subexponential Tails Bangwon Ko, Qihe Tang coordinate-wise increasing functions f and g for which the covariance exists. Tang (2008) relaxed 0 Tang and Tsitsiashvili (2003) observed

Tang, Qihe

338

An Analysis of the Nucleon QCD Sum Rules  

NASA Astrophysics Data System (ADS)

The nucleon and its negative-parity excited states in vacuum are examined in a maximum entropy method analysis of QCD sum rules. We derive the parity projected nucleon sum rules with all known first order ?s corrections to the Wilson coefficients of the operator product expansion (OPE). Since some of these corrections are large, we suppress them by using a phase-rotated Gaussian kernel. Additionally, this phase rotation strongly suppresses the continuum contribution and improves the convergence of the OPE. The resulting sum rule has the interesting feature that it is dominated by the term containing the chiral condensate of dimension 3. Analyzing this sum rule by the maximum entropy method, we are able to extract information on the masses of both the positive and negative parity states.

Ohtani, Keisuke; Gubler, Philipp; Oka, Makoto

339

Partial Sums of Two Quartic q-Series  

Microsoft Academic Search

The partial sums of two quartic basic hypergeometric series are investigated by means of the modified Abel lemma on summation by parts. Several summation and transformation formulae are consequently established.

Wenchang Chu; Chenying Wang

2009-01-01

340

On large deviations of sums of independent random variables  

E-print Network

On large deviations of sums of independent random variables Zhishui Hu12 , Valentin V. Petrov23, Australia, 3 Faculty of Mathematics and Mechanics, St. Petersburg University, Stary Peterhof, St. Petersburg

Sydney, University of

341

On large deviations for sums of independent random variables  

E-print Network

On large deviations for sums of independent random variables Valentin V. Petrov12 and John Robinson of Mathematics and Mechanics, St. Petersburg University, Stary Peterhof, St. Petersburg 198504, Russia Abstract

Sydney, University of

342

Standardization of 65Zn by sum-peak method.  

PubMed

A commercial solution of (65)Zn was standardized by the sum peak-method using a planar HPGe detector. The activity results were compared with measurements made with a well type 4?? ionization chamber, which is traceable to BIPM.RI (II)-K2.Zn-65 key-comparison performed in 2002. The sum-peak value was 42.79 kBq/g and the ionization chamber value was 42.74 kBq/g both at the reference date. The uncertainty obtained in the sum peak standardization was 0.25% (k=1), and in the ionization chamber was 0.85% (k=1). The results showed that sum-peak method can be used in (65)Zn standardization and this method is easier, simpler and more practical than others methods. PMID:22425414

Oliveira, E M; Iwahara, A; Poledna, R; Delgado, J U; da Silva, C J; da Silva, R L; Lopes, R T

2012-09-01

343

Aim For a Healthy Weight  

MedlinePLUS

... oxygen into energy), and behavior or habits. Energy Balance Energy balance is important for maintaining a healthy weight. The ... OUT over time = weight stays the same (energy balance) More energy IN than OUT over time = weight ...

344

Brief report: Weight dissatisfaction, weight status, and weight loss in Mexican-American children  

Technology Transfer Automated Retrieval System (TEKTRAN)

The study objectives were to assess the association between weight dissatisfaction, weight status, and weight loss in Mexican-American children participating in a weight management program. Participants included 265 Mexican American children recruited for a school-based weight management program. Al...

345

Changes in weight bias following weight loss: the impact of weight-loss method  

Microsoft Academic Search

Background:Many obese individuals lose weight to reduce weight stigma; however, little is known about whether other people's attitudes actually improve towards obese individuals after they have lost weight, and whether changes in attitudes depend on the method of weight loss. This study examined changes in people's perceptions of an obese target who had lost weight through diet and exercise or

J Fardouly; L R Vartanian

2012-01-01

346

Abstracting Digital Movies Automatically  

Microsoft Academic Search

ing Digital Movies AutomaticallyS. Pfeioeer, R. Lienhart, S. Fischer und W. EoeelsbergUniversit#t MannheimPraktische Informatik IVL 15, 16D-68131 MannheimAbstracting Digital Movies AutomaticallySilvia Pfeioeer, Rainer Lienhart, Stephan Fischer andWolfgang EoeelsbergPraktische Informatik IVUniversity of MannheimD-68131 Mannheimpfeiffer@pi4.informatik.uni-mannheim.deAbstractLarge video on demand databases consisting of thousands of digital moviesare not easy to handle: the...

Reihe Informatik S. Pfeioeer; R. Lienhart; S. Fischer Und W. Eoeelsberg

1996-01-01

347

Informedia Digital Video Library  

Microsoft Academic Search

The Informedia Digital Video Library Project is developing new technologies for creating full-content search and retrieval digital video libraries. Working in collaboration with WQED Pittsburgh, the project is creating a testbed that will enable K-12 students to access, explore, and retrieve science and mathematics materials from the digital video library. The library will initially contain 1,000 hours of video from

Michael G. Christel; Takeo Kanade; M. Mauldin; Raj Reddy; Marvin A. Sirbu; Scott M. Stevens; Howard D. Wactlar

1995-01-01

348

Against digital ontology  

Microsoft Academic Search

The paper argues that digital ontology (the ultimate nature of reality is digital, and the universe is a computational system equivalent to a Turing Machine) should\\u000a be carefully distinguished from informational ontology (the ultimate nature of reality is structural), in order to abandon the former and retain only the latter as a promising\\u000a line of research. Digital vs. analogue is

Luciano Floridi

2009-01-01

349

The effect of holiday weight gain on body weight.  

PubMed

The topic of holiday weight gain has been a frequent subject of the lay media; however, scientific interest has only been recent. Multiple studies in Western societies have reported average weight gains among adults during the period between mid-November and mid-January that were about 0.5 kg. The range in individual weight changes was large, however, and the already overweight and obese gain more weight than those who are healthy weight. When the average gain across the year was also measured, the holiday weight was the major contributor to annual excess weight gain. Efforts patterned to increase awareness to energy balance and body weight have been shown to be successful at reducing such gain. An exception to holiday weight gain being a major contributor to annual excess gain has been children, in whom summer weight gains have been observed to be the major contributor to average excess weight gain. PMID:24662697

Schoeller, Dale A

2014-07-01

350

Weight knowledge and weight magnitude: impact on lumbosacral loading.  

PubMed

Several factors can impact lumbosacral loads during lifting, including weight knowledge and weight magnitude. However, interaction between them has never been tested. This study investigated the interaction effect of these variables on lumbosacral forces and moments. Participants performed symmetrical lifts using three different weights. Weight knowledge involved known and unknown weight conditions. A biologically assisted dynamic model was used to calculate spinal loading parameters. Weight impacted all variables, while knowledge impacted only compression, by a moderate amount (5%), and spinal moments. Lifting a lightweight resulted in a difference of 16% and 7.2% between knowledge conditions for compression and anterior-posterior shear forces, respectively, compared with a negligible difference of < 1% when lifting a heavy weight. Increased spinal loading with light unknown weight can be attributed to increased muscular co-contraction. Weight knowledge is important to consider at low weight levels as it can increase tissue loading to values equivalent to lifting a heavier weight. PMID:25329859

Farrag, Ahmed T; Elsayed, Walaa H; El-Sayyad, Mohsen M; Marras, William S

2015-02-01

351

Reagents, Compositions, Weight Loss  

NSDL National Science Digital Library

This is a short experimental study of what happens to aluminum hydroxide, silicic acid, magnesium oxide, and calcium carbonate (or reagents of instructors choice) when they are heated to 110 and 1200 degrees. Students determine the formula and calculate the mole percent and weight percent of each element and oxide in each reagent. They heat the samples and calculate percentage weight loss or gain. Finally, they write a lab report summarizing their results. Be sure to have students save their samples for later use in a lab that introduces X-ray diffraction.

Perkins, Dexter

352

Charm and bottom hadronic form factors with QCD sum rules  

SciTech Connect

We present a brief review of some calculations of form factors and coupling constants in vertices with charm and bottom mesons in the framework of QCD sum rules. We first discuss the motivation for this work, describing possible applications of these form factors to charm and bottom decays processes. We first make a summarize of the QCD sum rules method. We give special attention to the uncertainties of the method introducing by the intrinsic variation of the parameters. Finally we conclude.

Bracco, M. E. [Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, Rod. Presidente Dutra Km 298, Polo Industrial, 27537-000, Resende, RJ (Brazil); Rodrigues, B. O.; Cerqueira, A. Jr. [Instituto de Fisica, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900, Rio de Janeiro, RJ (Brazil)

2013-03-25

353

Gauss Optics and Gauss Sum on an Optical Phenomena  

Microsoft Academic Search

In the previous article (Found. Phys. Lett. 16:325–341, 2003), we showed that a reciprocity of the Gauss sums is connected with the wave and particle complementary. In this article,\\u000a we revise the previous investigation by considering a relation between the Gauss optics and the Gauss sum based upon the recent\\u000a studies of the Weil representation for a finite group.

Shigeki Matsutani

2008-01-01

354

Generalized extreme value statistics and sum of correlated variables  

Microsoft Academic Search

We show that generalized extreme value statistics---the statistics of the kth largest value among a large set of random variables---can be mapped onto a problem of random sums. This allows us to identify classes of non-identical and (generally) correlated random variables with a sum distributed according to one of the three (k-dependent) asymptotic distributions of extreme value statistics, namely the

Eric Bertin; Maxime Clusel

2006-01-01

355

5 CFR 831.2005 - Designation of beneficiary for lump-sum payment.  

Code of Federal Regulations, 2010 CFR

...Designation of beneficiary for lump-sum payment. 831.2005 Section 831.2005 Administrative Personnel OFFICE OF PERSONNEL MANAGEMENT...CONTINUED) RETIREMENT Payment of Lump Sums § 831.2005 Designation of beneficiary for lump-sum...

2010-01-01

356

29 CFR 778.310 - Fixed sum for varying amounts of overtime.  

Code of Federal Regulations, 2010 CFR

...2010-07-01 2010-07-01 false Fixed sum for varying amounts of overtime. 778.310...OVERTIME COMPENSATION Special Problems Lump Sum Attributed to Overtime § 778.310 Fixed sum for varying amounts of overtime. A...

2010-07-01

357

Real Time Event Selection and Flash Analog-to-Digital Converters  

NASA Astrophysics Data System (ADS)

In high-energy particle experiments, high-speed analog logic is employed to select events on a real-time basis. Flash analog-to-digital converters replace the high-speed analog logic with digital logic. The digital logic gives great flexibility to the scheme for real-time event selection. This paper proposes the use of flash A/D converters for the logic used to obtain the total sum of the energy deposited in individual counters in a shower detector.

Imori, Masatosi

1983-09-01

358

Design of Optimal Digital Filters  

NASA Astrophysics Data System (ADS)

Four methods for designing digital filters optimal in the Chebyshev sense are developed. The properties of these filters are investigated and compared. An analytic method for designing narrow-band FIR filters using Zolotarev polynomials, which are extensions of Chebyshev polynomials, is proposed. Bandpass and bandstop narrow-band filters as well as lowpass and highpass filters can be designed by this method. The design procedure, related formulae and examples are presented. An improved method of designing optimal minimum phase FIR filters by directly finding zeros is proposed. The zeros off the unit circle are found by an efficient special purpose root-finding algorithm without deflation. The proposed algorithm utilizes the passband minimum ripple frequencies to establish the initial points, and employs a modified Newton's iteration to find the accurate initial points for a standard Newton's iteration. The proposed algorithm can be used to design very long filters (L = 325) with very high stopband attenuations. The design of FIR digital filters in the complex domain is investigated. The complex approximation problem is converted into a near equivalent real approximation problem. A standard linear programming algorithm is used to solve the real approximation problem. Additional constraints are introduced which allow weighting of the phase and/or group delay of the approximation. Digital filters are designed which have nearly constant group delay in the passbands. The desired constant group delay which gives the minimum Chebyshev error is found to be smaller than that of a linear phase filter of the same length. These filters, in addition to having a smaller, approximately constant group delay, have better magnitude characteristics than exactly linear phase filters with the same length. The filters have nearly equiripple magnitude and group delay. The problem of IIR digital filter design in the complex domain is formulated such that the existence of best approximation is guaranteed. An efficient and numerically stable algorithm for the design is proposed. The methods to establish a good initial point are investigated. Digital filters are designed which have nearly constant group delay in the passbands. The magnitudes of the filter poles near the passband edge are larger than of those far from the passband edge. A delay overshooting may occur in the transition band (don't care region), and it can be reduced by decreasing the maximum allowed pole magnitude of the design problem at the expense of increasing the approximation error.

Chen, Xiangkun

359

Method of improving a digital image  

NASA Technical Reports Server (NTRS)

A method of improving a digital image is provided. The image is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value I.sub.i (x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in each i-th spectral band in accordance with ##EQU1## where S is the number of unique spectral bands included in said digital data, W.sub.n is a weighting factor and * denotes the convolution operator. Each surround function F.sub.n (x,y) is uniquely scaled to improve an aspect of the digital image, e.g., dynamic range compression, color constancy, and lightness rendition. The adjusted intensity value for each position in each i-th spectral band is filtered with a common function and then presented to a display device. For color images, a novel color restoration step is added to give the image true-to-life color that closely matches human observation.

Rahman, Zia-ur (Inventor); Jobson, Daniel J. (Inventor); Woodell, Glenn A. (Inventor)

1999-01-01

360

Digital Imaging Investigations.  

ERIC Educational Resources Information Center

Explains how digital technology can be used as a tool for teaching students the skills of observation, questioning, information gathering, classifying, predicting, and hypothesis testing. (Author/SOE)

Keith, Ronald L.; Saunders, David K.; Yanik, Elizabeth G.

2003-01-01

361

Digital security technology simplified.  

PubMed

Digital security technology is making great strides in replacing analog and other traditional security systems including CCTV card access, personal identification and alarm monitoring applications. Like any new technology, the author says, it is important to understand its benefits and limitations before purchasing and installing, to ensure its proper operation and effectiveness. This article is a primer for security directors on how digital technology works. It provides an understanding of the key components which make up the foundation for digital security systems, focusing on three key aspects of the digital security world: the security network, IP cameras and IP recorders. PMID:17907609

Scaglione, Bernard J

2007-01-01

362

Digitization Best Practices  

SciTech Connect

This project involved performing tests and documenting results to determine best practices for digitizing older print documents. The digitization process is complicated, especially when original documents exhibit non-standard fonts and are faded. Tests focused on solutions to improve high quality scanning, increase OCR accuracy, and efficiently use embedded metadata. Results are summarized. From the test results on the right sides, we know that when we plan to digitize documents, we should balance Quantity and Quality based on our expectation, and then make final decision for the digitization process.

Xue, Fei [Los Alamos National Laboratory; Holtkamp, Irma S. [Los Alamos National Laboratory; Knudson, Frances L. [Los Alamos National Laboratory

2012-07-31

363

Digital solar system geology  

NASA Technical Reports Server (NTRS)

All available synoptic maps of the solid-surface bodies of the Solar System were digitized for presentation in the planned Atlas of the Solar System by Greeley and Batson. Since the last report (Batson et al., 1990), preliminary Uranian satellite maps were replaced with improved versions, Galilean satellite geology was simplified and digitized, structure was added to many maps, and the maps were converted to a standard format, with corresponding standing colors for the mapped units. Following these changes, the maps were re-reviewed by their authors and are now undergoing final editing before preparation for publication. In some cases (for Mercury, Venus, and Mars), more detailed maps were digitized and then simplified for the Atlas. Other detailed maps are planned to be digitized in the coming year for the Moon and the Galilean satellites. For most of the remaining bodies such as the Uranian satellites, the current digitized versions contain virtually all the detail that can be mapped given the available data; those versions will be unchanged for the Atlas. These digital geologic maps are archived at the digital scale of 1/16 degree/ pixel, in sinusoidal format. The availability of geology of the Solar System in a digital database will facilitate comparisons and integration with other data: digitized lunar geologic maps have already been used in a comparison with Galileo SSI observations of the Moon.

Batson, R. M.; Kozak, R. C.; Isbell, Nancy K.

1991-01-01

364

Closed-form summation of the Dowker and related sums  

NASA Astrophysics Data System (ADS)

Finite sums of powers of cosecants appear in a wide range of physical problems. We, through a unified approach which uses contour integrals and residues, establish the summation formulas for two general families of such sums. One of them is the family which was first studied and summed in closed form by Dowker [Phys. Rev. D 36, 3095 (1987)], while the other is related to it and has not been studied before. Our summation formulas of the Dowker sums involve only the Stirling numbers of the first kind and the (ordinary) Bernoulli polynomials and numbers, unlike the earlier summation formulas in which either the higher-order Bernoulli numbers and polynomials or the multiple sums involving the Bernoulli numbers and their products, were used. A great deal of other (known or presumably new) closed-form summations follows as straightforward corollaries to these formulas. Among them are two special cases of the celebrated Verlinde's formula and numerous sums encountered in various physical problems by McCoy and Orrick [J. Stat. Phys. 83, 839 (1996)], Gervois and Mehta [J. Math. Phys. 36, 5098 (1995)], and Henkel and Lacki [Phys. Lett. A 138, 105 (1989)].

Cvijovi?, Djurdje; Srivastava, H. M.

2007-04-01

365

A full digital approach to the TDCR method.  

PubMed

Current state of the art solutions based on the Triple to Double Coincidence Ratio method are generally large size, heavy-weight and not transportable systems. This is due, on one side, to large detectors and scintillation chambers and, on the other, to bulky analog electronics for data acquisition. CAEN developed a new, full digital approach to TDCR technique based on a portable, stand-alone, high-speed multichannel digitizer, on-board Digital Pulse Processing and dedicated DAQ software that emulates the well-known MAC3 analog board. PMID:24345521

Mini, Giuliano; Pepe, Francesco; Tintori, Carlo; Capogni, Marco

2014-05-01

366

Debunking the "Digital Native": Beyond Digital Apartheid, towards Digital Democracy  

ERIC Educational Resources Information Center

This paper interrogates the currently pervasive discourse of the "net generation" finding the concept of the "digital native" especially problematic, both empirically and conceptually. We draw on a research project of South African higher education students' access to and use of Information and Communication Technologies (ICTs) to show that age is…

Brown, C.; Czerniewicz, L.

2010-01-01

367

On weighted Shapley values  

Microsoft Academic Search

Nonsymmetric Shapley values for coalitional form games with transferable utility are studied. The nonsymmetries are modeled through nonsymmetric weight systems defined on the players of the games. It is shown axiomatically that two families of solutions of this type are possible. These families are strongly related to each other through the duality relationship on games. While the first family lends

E. Kalai; D. Samet

1987-01-01

368

Mass/Weight Connection  

NSDL National Science Digital Library

Students will recognize that the mass of an object is a measure that is independent of gravity. If they can effectively complete the guided inquiry activity as well as the short writing summary to reinforce what they learned, they will gain a foundation for understanding the difference between mass and weight.

King, Lance

2011-07-26

369

MINIMUM WEIGHT SHIELD SYNTHESIS  

Microsoft Academic Search

A simple model for radiation production and attenuation in a spherical ; multilayer reactor-shield assembly is introduced. Variational methods are ; applied to this model to minimize the weight subject to given specifications on ; the dose at the outside of the shield and on the properties of shielding ; materials. The method provides guidance in the choice of the

Troubetzkoy

1962-01-01

370

Losing Pregnancy Weight  

MedlinePLUS Videos and Cool Tools

... prevent weight retention and the potential long-term health risks to women. I'm Dr. Cindy Haines of HealthDay TV, with the news that your doctors are reading, health news that matters to you. Mobile version Get ...

371

Exponential smoothing weighted correlations  

NASA Astrophysics Data System (ADS)

In many practical applications, correlation matrices might be affected by the "curse of dimensionality" and by an excessive sensitiveness to outliers and remote observations. These shortcomings can cause problems of statistical robustness especially accentuated when a system of dynamic correlations over a running window is concerned. These drawbacks can be partially mitigated by assigning a structure of weights to observational events. In this paper, we discuss Pearson's ? and Kendall's ? correlation matrices, weighted with an exponential smoothing, computed on moving windows using a data-set of daily returns for 300 NYSE highly capitalized companies in the period between 2001 and 2003. Criteria for jointly determining optimal weights together with the optimal length of the running window are proposed. We find that the exponential smoothing can provide more robust and reliable dynamic measures and we discuss that a careful choice of the parameters can reduce the autocorrelation of dynamic correlations whilst keeping significance and robustness of the measure. Weighted correlations are found to be smoother and recovering faster from market turbulence than their unweighted counterparts, helping also to discriminate more effectively genuine from spurious correlations.

Pozzi, F.; Di Matteo, T.; Aste, T.

2012-06-01

372

Weight 1. Leadership  

E-print Network

Weight 0 1 2 3 1. Leadership 33% Has not demonstrated impact through a leadership role Has held a leadership role in one or more organizations and demonstrated impact Has held an organization-wide leadership role in one or more

Prodiæ, Aleksandar

373

Proven Weight Loss Methods  

MedlinePLUS

... healthy weight for me? • can you recommend a diet plan for me? • should i see a registered dietitian? • should i see a diabetes educator? • What kind of exercise is best for me? • how long will it take to reach my ... of Nutrition and Dietetics): www.eatright.org/programs/rdfinder • Find ...

374

Testing +/- 1-Weight Halfspaces  

E-print Network

We consider the problem of testing whether a Boolean function f:{???1,1} [superscript n] ?{???1,1} is a ±1-weight halfspace, i.e. a function of the form f(x)?=?sgn(w [subscript 1] x [subscript 1]?+?w [subscript 2] x ...

Matulef, Kevin M.

2009-01-01

375

Healthy Diet Weight Control  

E-print Network

· Healthy Diet · Weight Control Diet and Obesity #12;Maintaining a Healthy Diet, hypertension ­ Diabetes ­ Cancer · Low SES #12;Why Maintain a Healthy Diet? · Dietary factors contribute death, salt and HTN ­ Estimates of degree to which diet contributes to cancer range between 30

Meagher, Mary

376

Weight For It!  

NSDL National Science Digital Library

In this activity about weights and balances, learners create their own balance using paper cups. Then, learners explore how to compare the relative mass of objects. In the "Now, explore!" section, to take the experiment one step further, they can make carbon dioxide gas and discover its mass relative to the air around it.

Cosi

2009-01-01

377

Strengthening Weight Rooms.  

ERIC Educational Resources Information Center

Examines ways of giving an existing weight-training room new life without spending a lot of time and money. Tips include adding rubber floor coverings; using indirect lighting; adding windows, art work, or mirrors to open up the room; using more aesthetically pleasing ceiling tiles; upgrading ventilation; repadding or painting the equipment; and…

Sherman, Rachel M.

1997-01-01

378

Ideal Weight and Weight Satisfaction: Association With Health Practices  

PubMed Central

Evidence suggests that individuals have become more tolerant of higher body weights over time. To investigate this issue further, the authors examined cross-sectional associations among ideal weight, examination year, and obesity as well as the association of ideal weight and body weight satisfaction with health practices among 15,221 men and 4,126 women in the United States. Participants in 1987 reported higher ideal weights than participants in 2001, an effect particularly pronounced from 1987 to 2001 for younger and obese men (85.5 kg to 94.9 kg) and women (62.2 kg to 70.5 kg). For a given body mass index, higher ideal body weights were associated with greater weight satisfaction but lower intentions to lose weight. Body weight satisfaction was subsequently associated with greater walking/jogging, better diet, and lower lifetime weight loss but with less intention to change physical activity and diet or lose weight (P?weight satisfaction (P < 0.01) and was associated with less walking/jogging, poorer diet, and greater lifetime weight loss but with greater intention to change physical activity and diet or lose weight. Although the health implications of these findings are somewhat unclear, increased weight satisfaction, in conjunction with increases in societal overweight/obesity, may result in decreased motivation to lose weight and/or adopt healthier lifestyle behaviors. PMID:19546153

Ardern, Chris I.; Church, Timothy S.; Hebert, James R.; Sui, Xuemei; Blair, Steven N.

2009-01-01

379

Concise Papers__________________________________________________________________________________________ On Weight Design of Maximum Weighted  

E-print Network

process. Nevertheless, the MWL leaves two open questions: 1) How to design the weights so that an MWL__________________________________________________________________________________________ On Weight Design of Maximum Weighted Likelihood and an Extended EM Algorithm Zhenyue Zhang and Yiu-ming Cheung, Senior Member, IEEE Abstract--The recent Maximum Weighted Likelihood (MWL) [18], [19] has

Cheung, Yiu-ming

380

Overlap distributions and taxonomy analysis of spin glass states with equal weights  

E-print Network

499 Overlap distributions and taxonomy analysis of spin glass states with equal weights N. Parga) Résumé. 2014 Nous utilisons des techniques de taxonomie numérique pour vérifier l'ultramétricité des entre échantillons disparaissent. Abstract. 2014 Techniques of numerical taxonomy are used to make

Paris-Sud XI, Université de

381

Modern Summation Methods for Loop Integrals in Quantum Field Theory: The Packages Sigma, EvaluateMultiSums and SumProduction  

NASA Astrophysics Data System (ADS)

A large class of Feynman integrals, like e.g., two-point parameter integrals with at most one mass and containing local operator insertions, can be transformed to multi-sums over hypergeometric expressions. In this survey article we present a difference field approach for symbolic summation that enables one to simplify such definite nested sums to indefinite nested sums. In particular, the simplification is given -if possible- in terms of harmonic sums, generalized harmonic sums, cyclotomic harmonic sums or binomial sums. Special emphasis is put on the developed Mathematica packages Sigma, EvaluateMultiSums and SumProduction that assist in the task to perform these simplifications completely automatically for huge input expressions.

Schneider, C.

2014-06-01

382

Digital ischaemia in the digital age  

PubMed Central

After the accidental injection of epinephrine into a digit, various techniques to try and reverse the ensuing ischaemia were unsuccessful. To identify a further treatment strategy and as members of the admitting team were unfamiliar with digital injection of epinephrine a Google search was performed. Previous cases were described and separate sources indicated appropriate management protocols utilising phentolamine. After administration, an almost immediate reversal of ischaemic symptoms occurred. This highlights the role of the internet as an adjunct in managing unfamiliar situations and practising evidence based medicine. PMID:24950401

Elmussareh, M; Hart, CA; Khanna, A; Nasim, A

2011-01-01

383

Digital Lighting Functions  

Microsoft Academic Search

In this paper a notion of lighting function is introduced as an axiomatized formalization of the face membership rules suggested by Kovalevsky. These functions are defined in the context of the framework for digital topology previously developed by the authors. This enlarged framework provides the (, )-connectedness (, {6,18, 26}) defined on 3 within the graph-based approach to digital topology.

Rafael Ayala; Eladio Domínguez; Angel R. Francés; Antonio Quintero

1997-01-01

384

Shaping Digital Library Content.  

ERIC Educational Resources Information Center

Explores issues related to the selection and purchase of digital content in academic libraries, including commercially-produced databases, electronic journals, and books and other electronic resources that are purchased from vendors; and in-house digitization projects. Considers the degree to which standard collection management principles apply.…

Miller, Rush G.

2002-01-01

385

Music Instruction Goes Digital  

ERIC Educational Resources Information Center

Faced with meager enrollment in band, orchestra, and choir programs, schools are using digital technology to excite students about creating music on today's terms. This article discusses how music educators reinvent their profession by acknowledging and incorporating the way students interact with music today--digitally. Bill Evans, a music…

Demski, Jennifer

2011-01-01

386

Abstracting Digital Movies Automatically  

Microsoft Academic Search

Large video-on-demand databases consisting of thousands of digital movies are not easy to handle: the user must have an attractive means of retrieving his movie of choice. For analog video, movie trailers are produced to allow a quick preview and perhaps stimulate possible buyers. This paper presents techniques for automatically producing such movie abstracts of digital videos.

Silvia Pfeiffer; Rainer Lienhart; Stephan Fischer; Wolfgang Effelsberg

1996-01-01

387

Cresting the Digital Divide  

ERIC Educational Resources Information Center

Catawba Valley Community College has introduced digital storytelling (DS), an innovative instructional method that has produced extraordinary results. Digital storytelling uses affordable software to craft powerful multimedia presentations of student writing. Students create 3-to-4-minute movies with images, voiceovers, and music. This project…

Gregory, Kay; Steelman, Joyce

2008-01-01

388

Digital rotation measurement unit  

DOEpatents

A digital rotation indicator is disclosed for monitoring the position of a valve member having a movable actuator. The indicator utilizes mercury switches adapted to move in cooperation with the actuator. Each of the switches produces an output as it changes state when the actuator moves. A direction detection circuit is connected to the switches to produce a first digital signal indicative of the direction of rotation of the actuator. A count pulse generating circuit is also connected to the switches to produce a second digital pulse signal having count pulses corresponding to a change of state of any of the mercury switches. A reset pulse generating circuit is provided to generate a reset pulse each time a count pulse is generated. An up/down counter is connected to receive the first digital pulse signal and the second digital pulse signal and to count the pulses of the second digital pulse signal either up or down depending upon the instantaneous digital value of the first digital signal whereby a running count indicative of the movement of the actuator is maintained.

Sanderson, S.N.

1983-09-30

389

Occupying the Digital Humanities  

ERIC Educational Resources Information Center

This essay questions the digital humanities' dependence on interpretation and critique as strategies for reading and responding to texts. Instead, the essay proposes suggestion as a digital rhetorical practice, one that does not replace hermeneutics, but instead offers alternative ways to respond to texts. The essay uses the Occupy movement as an…

Rice, Jeff

2013-01-01

390

Digital communications study  

NASA Technical Reports Server (NTRS)

Research is reported dealing with problems of digital data transmission and computer communications networks. The results of four individual studies are presented which include: (1) signal processing with finite state machines, (2) signal parameter estimation from discrete-time observations, (3) digital filtering for radar signal processing applications, and (4) multiple server queues where all servers are not identical.

Boorstyn, R. R.

1973-01-01

391

Digital Image Access & Retrieval.  

ERIC Educational Resources Information Center

Recent technological advances in computing and digital imaging technology have had immediate and permanent consequences for visual resource collections. Libraries are involved in organizing and managing large visual resource collections. The central challenges in working with digital image collections mirror those that libraries have sought to…

Heidorn, P. Bryan, Ed.; Sandore, Beth, Ed.

392

Digital Business RESEARCH BRIEF  

E-print Network

for Digital Business, S. Bhansali and E. Brynjolfsson Measuring the Impact of Electronic Data ManagementCenter for Digital Business RESEARCH BRIEF Volume X Number 2 January 2008 © 2008 MIT Center-experiment: the phased introduction of Electronic Document Management (EDM) across multiple offices at different dates

393

Digital Longitudinal Tomosynthesis  

Microsoft Academic Search

The purpose of this dissertation was to investigate the clinical utility of digital longitudinal tomosynthesis in radiology. By acquiring a finite group of digital images during a longitudinal tomographic exposure, and processing these images, tomographic planes, other than the fulcrum plane, can be reconstructed. This process is now termed \\

Daniel Steven Rimkus

1985-01-01

394

Everglades Digital Library  

NSDL National Science Digital Library

The Everglades Digital Library (EDL) is a comprehensive portal to high-quality digital resources relating to the south Florida environment. These resources include online texts, articles, reports, photographs, maps, datasets, educational materials, and historical records, as well as links to organizational web sites and agency home pages. These materials come from libraries, government agencies, nonprofit organizations, educational institutions, and other sources.

395

Creating Digital Authors  

ERIC Educational Resources Information Center

Elementary students find themselves engaged and learning at a digital writing camp. The authors find that such elementary students usually have limited access to technology at home and school, and posit that teachers should do all they can to give them more access to and experience in digital composing. Students were motivated and learned to use…

Zoch, Melody; Langston-DeMott, Brooke; Adams-Budde, Melissa

2014-01-01

396

Writing and Digital Media  

ERIC Educational Resources Information Center

Digital media has become an increasingly powerful force in modern society. This volume brings together outstanding European, American and Australian research in "writing and digital media" and explores its cognitive, social and cultural implications. In addition to presenting programs of original research by internationally known scholars from a…

van Waes, Luuk, Ed.; Leijten, Marielle, Ed.; Neuwirth, Chris, Ed.

2006-01-01

397

Analogue to digital transformation  

NASA Astrophysics Data System (ADS)

ESDU 92044 examines the replacement of an analog controller element by an equivalent digital controller element while retaining for the new hybrid system performance characteristics that are acceptably similar to those of the original continuous system. The main features are described of a system containing both analog and digital elements within the same loop, and the analog-to-digital and digital-to-analog components that are then necessarily a part of the system. The frequency response characteristics of transformation are discussed, introducing the problem of aliasing whereby a digital output can be matched by continuous sine waves of different frequencies that are then indistinguishable to the digital sampler. The need to avoid aliasing is considered and the concept of a folding frequency introduced below which aliasing is impossible. Two transformation methods for designing digital filters equivalent to analog filters are discussed: the impulse invariance and bilinear transformations. They are compared by examining digital equivalents of such analogue filters as simple and compound first-order lag and lead filters, second-order lag filters and first-order notch filters. The methods are compared for two sampling rates using Bode plots illustrating the gain and phase variation with frequency. An example based on an electromechanical instrument servo illustrates the transformation of an analog lag-lead controller using the bilinear transformation.

1992-12-01

398

Digital Library Task Force  

Microsoft Academic Search

In 1995, the IEEE Computer Society established the Task Force on Digital Libraries as a first step leading to a full-fledged Technical Committee. The task force is to promote research in the theory and practice of all aspects of digital libraries. The task force sponsors activities that benefit its members and profession. Such activities include sponsoring and co-sponsoring symposia, sessions

N. R. Adam; R. Holowczak; M. Halem; N. Lal; Y. Yesha

1996-01-01

399

Browsing digital video  

Microsoft Academic Search

Video in digital format coupled with digital\\/programmable playback devices presents opportunities for significantly enhancing the user's viewing experience. For example, time compression can shorten the viewing length of a video and shot boundary frames can provide a visual index into the content. Such features have primarily been evaluated in isolation with a narrow set of video content types. We investigated

Francis C. Li; Anoop Gupta; Elizabeth Sanocki; Li-wei He; Yong Rui

2000-01-01

400

Digital Video Editing  

ERIC Educational Resources Information Center

Monica Adams, head librarian at Robinson Secondary in Fairfax country, Virginia, states that librarians should have the technical knowledge to support projects related to digital video editing. The process of digital video editing and the cables, storage issues and the computer system with software is described.

McConnell, Terry

2004-01-01

401

Digital Media and Learning  

ERIC Educational Resources Information Center

MacArthur launched the digital media and learning initiative in 2006 to explore how digital media are changing the way young people learn, socialize, communicate, and play. Since 2006, the Foundation has awarded grants totaling more than $100 million for research, development of innovative new technologies, new learning environments for youth,…

John D. and Catherine T. MacArthur Foundation, 2012

2012-01-01

402

Weighted Competition Graphs YOSHIO SANO  

E-print Network

Weighted Competition Graphs YOSHIO SANO Research Institute for Mathematical Sciences, Kyoto a generalization of competition graphs, called weighted competi- tion graphs. The weighted competition graph) is the competition graph of D, and the weight w(e) of an edge e = xy E is the number of the common preys of x and y

403

Correlation Weights in Multiple Regression  

ERIC Educational Resources Information Center

A general theory on the use of correlation weights in linear prediction has yet to be proposed. In this paper we take initial steps in developing such a theory by describing the conditions under which correlation weights perform well in population regression models. Using OLS weights as a comparison, we define cases in which the two weighting

Waller, Niels G.; Jones, Jeff A.

2010-01-01

404

Parallel digital forensics infrastructure.  

SciTech Connect

This report documents the architecture and implementation of a Parallel Digital Forensics infrastructure. This infrastructure is necessary for supporting the design, implementation, and testing of new classes of parallel digital forensics tools. Digital Forensics has become extremely difficult with data sets of one terabyte and larger. The only way to overcome the processing time of these large sets is to identify and develop new parallel algorithms for performing the analysis. To support algorithm research, a flexible base infrastructure is required. A candidate architecture for this base infrastructure was designed, instantiated, and tested by this project, in collaboration with New Mexico Tech. Previous infrastructures were not designed and built specifically for the development and testing of parallel algorithms. With the size of forensics data sets only expected to increase significantly, this type of infrastructure support is necessary for continued research in parallel digital forensics. This report documents the implementation of the parallel digital forensics (PDF) infrastructure architecture and implementation.

Liebrock, Lorie M. (New Mexico Tech, Socorro, NM); Duggan, David Patrick

2009-10-01

405

Digital Document Quarterly  

NSDL National Science Digital Library

Henry Gladney has an established background in the field of digital document management, and he also holds a number of patents. Gladney started publishing the Digital Document Quarterly (DDQ) in 2002 as an online publication that covers everything from the information revolution to providing information about digital preservation solutions. Visitors to the site can read the introduction to the DDQ, and then make their way through all of the previous issues. It's easy to see why different information science professionals and librarians would find the archive useful, as the topics covered here include basic topics in digital preservation, preserving office records, information retrieval, and even the epistemology of digital preservation. The site is rounded out by a nice glossary of terms, which covers everything from "abstract" to "value".

2008-01-01

406

Digital Signal Processing  

NSDL National Science Digital Library

Digital signal processing is a technique that uses digital methods to process signals. Processing a signal means manipulating it to improve it, change it, or alter it as required for some application. Some examples of processes are filtering, modulation and demodulation, mixing, spectrum analysis, compression and decompression, and many others. In the past, most of these processes have been accomplished with analog techniques and circuits. Today, that has changed. While analog processing has not disappeared, it is slowly being replaced by digital processing in most applications. DSP is now used in almost all electronic equipment and knowledge of its operation is critical to an overall knowledge and understanding of electronics. In digital processing, the analog signal to be processed is first converted to digital then processing is done by a computer. The computer output is then converted back to analog. This module describes this process and outlines the most common applications.

407

Maternal influences on birth weight.  

PubMed

The birth weight of 2,848 singleton babies delivered Al-Medina District hospitals was studied. The mean birth weight of Al-Medina babies was 3.26 Kg. (SD 0.44), the males with mean birth weight of 3.32 Kg. (SD 0.45), and were significantly heavier than females with a mean birth weight of 3.20 Kg. (SD 0.42). The incidence of low birth weight was 7.0 per cent. The birth weight was found to increase consistently with maternal age, parity, and height. Birth weight was significantly higher for babies of non-consanguineous parents. PMID:2500524

al-Sekait, M A

1989-04-01

408

Digital biology and chemistry.  

PubMed

This account examines developments in "digital" biology and chemistry within the context of microfluidics, from a personal perspective. Using microfluidics as a frame of reference, we identify two areas of research within digital biology and chemistry that are of special interest: (i) the study of systems that switch between discrete states in response to changes in chemical concentration of signals, and (ii) the study of single biological entities such as molecules or cells. In particular, microfluidics accelerates analysis of switching systems (i.e., those that exhibit a sharp change in output over a narrow range of input) by enabling monitoring of multiple reactions in parallel over a range of concentrations of signals. Conversely, such switching systems can be used to create new kinds of microfluidic detection systems that provide "analog-to-digital" signal conversion and logic. Microfluidic compartmentalization technologies for studying and isolating single entities can be used to reconstruct and understand cellular processes, study interactions between single biological entities, and examine the intrinsic heterogeneity of populations of molecules, cells, or organisms. Furthermore, compartmentalization of single cells or molecules in "digital" microfluidic experiments can induce switching in a range of reaction systems to enable sensitive detection of cells or biomolecules, such as with digital ELISA or digital PCR. This "digitizing" offers advantages in terms of robustness, assay design, and simplicity because quantitative information can be obtained with qualitative measurements. While digital formats have been shown to improve the robustness of existing chemistries, we anticipate that in the future they will enable new chemistries to be used for quantitative measurements, and that digital biology and chemistry will continue to provide further opportunities for measuring biomolecules, understanding natural systems more deeply, and advancing molecular and cellular analysis. Microfluidics will impact digital biology and chemistry and will also benefit from them if it becomes massively distributed. PMID:24889331

Witters, Daan; Sun, Bing; Begolo, Stefano; Rodriguez-Manzano, Jesus; Robles, Whitney; Ismagilov, Rustem F

2014-09-01

409

Weighted Guided Image Filtering.  

PubMed

It is known that local filtering-based edge-preserving smoothing techniques suffer from halo artifacts. In this paper, a weighted guided image filter (WGIF) is introduced by incorporating an edge-aware weighting into an existing guided image filter (GIF) to address the problem. The WGIF inherits advantages of both global and local smoothing filters in the sense that: 1) the complexity of the WGIF is O(N) for an image with N pixels, which is same as the GIF and 2) the WGIF can avoid halo artifacts like the existing global smoothing filters. The WGIF is applied for single image detail enhancement, single image haze removal, and fusion of differently exposed images. Experimental results show that the resultant algorithms produce images with better visual quality and at the same time halo artifacts can be reduced/avoided from appearing in the final images with negligible increment on running times. PMID:25415986

Li, Zhengguo; Zheng, Jinghong; Zhu, Zijian; Yao, Wei; Wu, Shiqian

2015-01-01

410

Does Weight Matter?  

NSDL National Science Digital Library

Using the same method for measuring friction that was used in the previous lesson (Discovering Friction), students design and conduct experiments to determine if weight added incrementally to objects affects the amount of friction encountered when they slide across flat surfaces. After graphing the data from their experiments, students calculate the coefficients of friction between the objects and the surfaces they moved upon, for both static and kinetic friction.

Engineering K-PhD Program,

411

6.SP Puppy Weights  

NSDL National Science Digital Library

This is a task from the Illustrative Mathematics website that is one part of a complete illustration of the standard to which it is aligned. Each task has at least one solution and some commentary that addresses important asects of the task and its potential use. Here are the first few lines of the commentary for this task: Below are the 25 birth weights, in ounces, of all the Labrador Retriever puppies born at Kingston Kennels in the last six months. 131415151616161617171...

412

One-parameter scaling and exponential-sum fitting for water vapor and CO2 infrared transmission functions  

NASA Technical Reports Server (NTRS)

A medium-sized band model for water vapor and CO2 absorption is developed using the one-parameter scaling approximation. The infrared spectrum is divided into 10 bands. The Planck-weighted diffuse transmittance is reduced to a function dependent only upon the scaled absorber amount and fit by an exponential sum. By selecting specific sets of absorption coefficients for exponential-sum fitting, computations of fluxes and cooling rate are made very fast. Compared to a broadband model, the accuracy, speed, and versatility are all enhanced. With absorption due to water vapor line, continuum, CO2 as well as O3 included, the parameterization introduces an error of less than 1.5 W/sq m in fluxes and less than 0.15 C/day in the tropospheric and lower stratospheric cooling rates.

Chou, Ming-Dah; Ridgway, William L.; Yan, Michael M.-H.

1993-01-01

413

Digitized two-parameter spectrometer for neutron-gamma mixed field  

SciTech Connect

This paper shows the results of digital processing of output pulses from combined photon-neutron detector using a commercially available digitizer ACQUIRIS DP 210. The advantage of digital processing is reduction of the apparatus in weight and size, acceleration of measurement, and increased resistance to pile-up of pulses. The neutron and photon spectrum of radionuclide source {sup 252}Cf is presented. (authors)

Matej, Z. [Faculty of Informatics, Masaryk Univ., Botanicka 68a, 602 00 Brno (Czech Republic); Cvachovec, J.; Prenosil, V. [Masaryk Univ., Brno (Czech Republic); Cvachovec, F. [Univ. of Defence, Brno (Czech Republic); Zaritski, S. [Kurchatov Inst., Moscow (Russian Federation)

2011-07-01

414

Computing Logarithms Digit-by-Digit  

ERIC Educational Resources Information Center

In this work, we present an algorithm for computing logarithms of positive real numbers, that bears structural resemblance to the elementary school algorithm of long division. Using this algorithm, we can compute successive digits of a logarithm using a 4-operation pocket calculator. The algorithm makes no use of Taylor series or calculus, but…

Goldberg, Mayer

2005-01-01

415

Digital Fundamentals Presentation: Serial Digital Interface  

NSDL National Science Digital Library

Basic electronics systems operations all contain the generation, transfer, and reception of electronic data. One of the most common but not usually covered interfaces is Serial Input and Output (I/O). This presentation covers the standard ways of getting data in and out of digital circuits, equipment, and computer systems. Users must create a free account to download this resource.

2014-07-18

416

Aperture weighting technique for video synthetic aperture radar  

NASA Astrophysics Data System (ADS)

We present a technique for aperture weighting for use in video synthetic aperture radar (SAR). In video SAR the aperture required to achieve the desired cross range resolution typically exceeds the frame rate period. As a result, there can be a significant overlap in the collected phase history used to form consecutive images in the video. Video SAR algorithms seek to exploit this overlap to avoid unnecessary duplication of processing. When no aperture weighting or windowing is used one can simply form oversampled SAR images from the non-overlapping sub-apertures using coherent back projection (or other similar techniques). The resulting sub-aperture images may be coherently summed to produce a full resolution image. A simple approach to windowing for sidelobe control is to weight the sub-apertures during summation of the images. Our approach involves producing two or more weighted images for each sub-aperture which can be linearly combined to approximate any desired aperture weighting. In this method we achieve nearly the same sidelobe control as weighting the phase history data and forming a new image for each frame without losing the computation savings of the sub-aperture image combining approach.

Hawley, Robert W.; Garber, Wendy L.

2011-06-01

417

Modifying the Sum Over Topological Sectors and Constraints on Supergravity  

E-print Network

The standard lore about the sum over topological sectors in quantum field theory is that locality and cluster decomposition uniquely determine the sum over such sectors, thus leading to the usual theta-vacua. We show that without changing the local degrees of freedom, a theory can be modified such that the sum over instantons should be restricted; e.g. one should include only instanton numbers which are divisible by some integer p. This conclusion about the configuration space of quantum field theory allows us to carefully reconsider the quantization of parameters in supergravity. In particular, we show that FI-terms and nontrivial Kahler forms are quantized. This analysis also leads to a new derivation of recent results about linearized supergravity.

Nathan Seiberg

2010-04-30

418

Additional corrections to the Gross-Llewellyn Smith sum rule  

SciTech Connect

We investigate some QCD corrections that contribute to the Gross-Llewellyn Smith sum rule but have not been included in previous analyses of it. We first review the techniques by which the xF{sub 3} structure function is extracted from combinations of neutrino and antineutrino cross sections. Next we investigate corrections to the Gross-Llewellyn Smith sum rule, with particular attention to contributions arising from strange quark distributions and from charge symmetry violating parton distributions. We find that additional corrections from strange quarks and parton charge symmetry violation are likely to have a small but potentially significant role in decreasing the current discrepancy between the experimental and theoretical estimates of the Gross-Llewellyn Smith sum rule.

Londergan, J. T.; Thomas, A. W. [Department of Physics and Center for Exploration of Energy and Matter, Indiana University, Bloomington, Indiana 47405 (United States); CSSM, School of Chemistry and Physics, University of Adelaide, Adelaide SA 5005 (Australia)

2010-12-01

419

Heavy hybrid mesons in the QCD sum rule  

E-print Network

We study the spectra of the hybrid mesons containing one heavy quark ($q\\bar{Q}g$) within the framework of QCD sum rules in the heavy quark limit. The derived sum rules are stable with the variation of the Borel parameter within their corresponding working ranges. The extracted binding energy for the heavy hybrid doublets $H(S)$ and $M(T)$ is almost degenerate. We also calculate the pionic couplings between these heavy hybrid and the conventional heavy meson doublets using the light-cone QCD sum rule method. The extracted coupling constants are rather small as a whole. With these couplings we make a rough estimate of the partial widths of these pionic decay channels.

Peng-Zhi Huang; Shi-Lin Zhu

2011-03-03

420

Meson-baryon coupling constants from QCD sum rules  

SciTech Connect

The QCD Sum Rules method which links the hadronic degrees of freedom with the underlying QCD parameters, serves as a very useful tool to extract qualitative and quantitative information about hadron properties. The QCD sum rules method has been extensively used to investigate the meson-baryon couplings, especially the pseudoscalar meson-nucleon case where the calculations of the pion-nucleon coupling constant reproduce the empirical value fairly well. In this work, the meson baryon coupling constants are analyzed using QCD sum rules method, with an emphasis on the scalar meson-nucleon interactions which play an important role in one boson exchange (OBE) models of nucleon-nucleon (NN) and hyperon-nucleon (YN) interactions. The coupling constants obtained are compared with the results of Nijmegen NN potential model.

Erkol, G.; Timmermans, R.G.E. [Theory Group, KVI, University of Groningen, Zernikelaan 25, 9747 AA Groningen (Netherlands); Rijken, Th.A. [Institute for Theoretical Physics, University of Nijmegen, Nijmegen (Netherlands)

2005-05-06

421

The lowest hidden charmed tetraquark state from QCD sum rules  

NASA Astrophysics Data System (ADS)

In this paper, we study the S\\bar {S} type scalar tetraquark state cq\\bar {c}\\bar {q} in detail with the QCD sum rules by calculating the contributions of the vacuum condensates up to dimension 10 in the operator product expansion, and obtain the value MZc = (3.82+0.08-0.08) GeV, which is the lowest mass for the hidden charmed tetraquark states from the QCD sum rules. Furthermore, we calculate the hadronic coupling constants GZc?c? and GZcDD with the three-point QCD sum rules, then study the strong decays Zc??c?, DD, and observe that the total width ?Zc?21 MeV. The present predictions can be confronted with the experimental data in the future at the BESIII, LHCb and Belle-II.

Wang, Zhi-Gang

2014-12-01

422

Factorization of numbers with truncated Gauss sums at rational arguments  

E-print Network

Factorization of numbers with the help of Gauss sums relies on an intimate relationship between the maxima of these functions and the factors. Indeed, when we restrict ourselves to integer arguments of the Gauss sum we profit from a one-to-one relationship. As a result the identification of factors by the maxima is unique. However, for non-integer arguments such as rational numbers this powerful instrument to find factors breaks down. We develop new strategies for factoring numbers using Gauss sums at rational arguments. This approach may find application in a recent suggestion to factor numbers using an light interferometer [V. Tamma et al., J. Mod. Opt. in this volume] discussed in this issue.

S. Wölk; C. Feiler; W. P. Schleich

2012-10-24

423

A Shuttle Upper Atmosphere Mass Spectrometer /SUMS/ experiment  

NASA Technical Reports Server (NTRS)

A magnetic mass spectrometer is currently being adapted to the Space Shuttle Orbiter to provide repeated high altitude atmosphere data to support in situ rarefied flow aerodynamics research, i.e., in the high velocity, low density flight regime. The experiment, called Shuttle Upper Atmosphere Mass Spectrometer (SUMS), is the first attempt to design mass spectrometer equipment for flight vehicle aerodynamic data extraction. The SUMS experiment will provide total freestream atmospheric quantitites, principally total mass density, above altitudes at which conventional pressure measurements are valid. Experiment concepts, the expected flight profile, tradeoffs in the design of the total system and flight data reduction plans are discussed. Development plans are based upon a SUMS first flight after the Orbiter initial development flights.

Blanchard, R. C.; Duckett, R. J.; Hinson, E. W.

1982-01-01

424

ELEC3028 Digital Transmission MODEM S Chen Digital Communication System  

E-print Network

ELEC3028 Digital Transmission ­ MODEM S Chen Digital Communication System · Purpose: communicate: rate, quality spectral bandwidth requirement · Major components: CODEC, MODEM and channel modulation input output CODEC MODEM Medium 1 #12;ELEC3028 Digital Transmission ­ MODEM S Chen Digital

Chen, Sheng

425

Digital Library and Digital Reference Service: Integration and Mutual Complementarity  

ERIC Educational Resources Information Center

Both the digital library and the digital reference service were invented and have been developed under the networked environment. Among their intersections, the fundamental thing is their symbiotic interest--serving the user in a more efficient way. The article starts by discussing the digital library and its service and the digital reference…

Liu, Jia

2008-01-01

426

Digital Preservation: A Time Bomb for Digital Libraries  

Microsoft Academic Search

Abstract. The difficulty and expense of preserving digital information is a potential impediment to digital library development. Preservation of traditional materials became,more,successful and systematic after libraries and archives integrated preservation into overall planning and resource allocation. Digital preservation is largely experimental and replete with the risks associated with untested methods. Digital preservation strategies are shaped by the needs and constraints

Margaret Hedstrom

1998-01-01

427

20 CFR 234.11 - 1974 Act lump-sum death payment.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false 1974 Act lump-sum death payment. 234.11 Section 234.11 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.11 1974 Act lump-sum death payment. (a) The total amount of...

2010-04-01

428

20 CFR 234.12 - 1937 Act lump-sum death payment.  

Code of Federal Regulations, 2013 CFR

...2012-04-01 true 1937 Act lump-sum death payment. 234.12 Section 234.12 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.12 1937 Act lump-sum death payment. (a) The 1937 Act LSDP is...

2013-04-01

429

20 CFR 234.12 - 1937 Act lump-sum death payment.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false 1937 Act lump-sum death payment. 234.12 Section 234.12 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.12 1937 Act lump-sum death payment. (a) The 1937 Act LSDP is...

2010-04-01

430

20 CFR 234.11 - 1974 Act lump-sum death payment.  

...2012-04-01 true 1974 Act lump-sum death payment. 234.11 Section 234.11 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.11 1974 Act lump-sum death payment. (a) The total amount of...

2014-04-01

431

20 CFR 234.11 - 1974 Act lump-sum death payment.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false 1974 Act lump-sum death payment. 234.11 Section 234.11 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.11 1974 Act lump-sum death payment. (a) The total amount of...

2011-04-01

432

20 CFR 234.12 - 1937 Act lump-sum death payment.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false 1937 Act lump-sum death payment. 234.12 Section 234.12 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.12 1937 Act lump-sum death payment. (a) The 1937 Act LSDP is...

2012-04-01

433

20 CFR 234.12 - 1937 Act lump-sum death payment.  

Code of Federal Regulations, 2011 CFR

...2011-04-01 false 1937 Act lump-sum death payment. 234.12 Section 234.12 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.12 1937 Act lump-sum death payment. (a) The 1937 Act LSDP is...

2011-04-01

434

20 CFR 234.11 - 1974 Act lump-sum death payment.  

Code of Federal Regulations, 2012 CFR

...2012-04-01 false 1974 Act lump-sum death payment. 234.11 Section 234.11 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.11 1974 Act lump-sum death payment. (a) The total amount of...

2012-04-01

435

20 CFR 234.12 - 1937 Act lump-sum death payment.  

...2012-04-01 true 1937 Act lump-sum death payment. 234.12 Section 234.12 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.12 1937 Act lump-sum death payment. (a) The 1937 Act LSDP is...

2014-04-01

436

20 CFR 234.11 - 1974 Act lump-sum death payment.  

Code of Federal Regulations, 2013 CFR

...2012-04-01 true 1974 Act lump-sum death payment. 234.11 Section 234.11 ...RETIREMENT ACT LUMP-SUM PAYMENTS Lump-Sum Death Payment § 234.11 1974 Act lump-sum death payment. (a) The total amount of...

2013-04-01

437

Digital sonar system  

DOEpatents

A transponder of an active digital sonar system identifies a multifrequency underwater activating sonar signal received from a remote sonar transmitter. The transponder includes a transducer that receives acoustic waves, including the activating sonar signal, and generates an analog electrical receipt signal. The analog electrical receipt signal is converted to a digital receipt signal and cross-correlated with a digital transmission signal pattern corresponding to the activating sonar signal. A relative peak in the cross-correlation value is indicative of the activating sonar signal having been received by the transponder. In response to identifying the activating sonar signal, the transponder transmits a responding multifrequency sonar signal.

Young, Kenneth K. (Seattle, WA); Wilkes, R. Jeffrey (Seattle, WA)

1995-01-01

438

Digital Libraries Initiative  

NSDL National Science Digital Library

Eight US institutions are sponsoring this recently-announced initiative including the National Science Foundation, the Library of Congress, and the Defense Advanced Research Projects Agency. Phase 2 of the Digital Libraries Initiative is designed to extend research, accelerate development, and create new capabilities for digital libraries, as well as investigate the study of the interaction between people and digital libraries in various contexts. The initiative is divided into the areas of research, and testbeds & applications. Further information, along with proposal due dates and award amounts are available at the site.

439

Fast transient digitizer  

DOEpatents

Method and apparatus for sequentially scanning a plurality of target elements with an electron scanning beam modulated in accordance with variations in a high-frequency analog signal to provide discrete analog signal samples representative of successive portions of the analog signal; coupling the discrete analog signal samples from each of the target elements to a different one of a plurality of high speed storage devices; converting the discrete analog signal samples to equivalent digital signals; and storing the digital signals in a digital memory unit for subsequent measurement or display.

Villa, Francesco (Palo Alto, CA)

1982-01-01

440

QCD sum rules and properties of baryons in nuclei  

SciTech Connect

The use of medium-energy experiments to constrain in-medium four-quark condensates, whose uncertainty is currently the most important problem inhibiting the use of QCD sum rules to study hadrons in nuclear matter, is discussed. A value for a particular linear combination of these condensates is extracted using results of an Isobar-Doorway model analysis of pion-nucleus scattering data and a QCD sum rule analysis of the mass of the {Delta}(1232) in nuclei. Extending the analysis to include higher-lying baryon resonances is possible with data from modem facilities.

Johnson, M.B. [Los Alamos National Lab., NM (United States); Kisslinger, L.S. [Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Physics

1995-12-31

441

Sum rules of four-neutrino mixing in matter  

E-print Network

Assuming the existence of one light sterile neutrino, we investigate the neutrino flavor mixing matrix in matter. Sum rules between the mixing parameters in vacuum and their counterparts in matter are derived. By using these new sum rules, we obtain the simple but exact expressions of the effective flavor mixing matrix in matter in terms of neutrino masses and the mixing parameters in vacuum. The rephasing invariants, sides of unitarity quadrangles and oscillation probabilities in matter are also achieved. Our model-independent results will be very helpful for analyzing flavor mixing and CP violation in the future long-baseline neutrino oscillation experiments.

He Zhang

2006-06-04

442

Impact of Duality Violations on Spectral Sum Rule Analyses  

E-print Network

Recent sum rule analyses on the two-point correlator have led to significant discrepancies in the values found for the OPE condensates, most dramatically in the dimension eight condensate and to a lesser extent in the dimension six one. Precise knowledge of these condensates is of relevance in kaon decays and therefore it seems mandatory to assess the actual impact of what is commonly neglected in spectral sum rules, most prominently the issue of duality violations. We will explicitly compute them in a toy model and show that they are a priori non-negligible.

Oscar Cata

2005-10-10

443

Application of the maximum entropy method to QCD sum rules  

NASA Astrophysics Data System (ADS)

QCD sum rules have long been used to describe the physical properties of hadrons directly from QCD. While this approach was often quite successful, it also has its limitations, the most important one being the need to introduce some specific ansatz for parametrizing the spectral function. For allowing a more general analysis of the sum rules, a new analysis method based on the maximum entropy method has been introduced [1], and has in the meantime been applied to several channels in various environments. In these proceedings, we will discuss some recent results, which have been obtained with the help of this novel approach.

Gubler, Philipp

2014-12-01

444

Testing solar lepton mixing sum rules in neutrino oscillation experiments  

E-print Network

Small discrete family symmetries such as S4, A4 or A5 may lead to simple leading-order predictions for the neutrino mixing matrix such as the bimaximal, tribimaximal or golden ratio mixing patterns, which may be brought into agreement with experimental data with the help of corrections from the charged-lepton sector. Such scenarios generally lead to relations among the parameters of the physical leptonic mixing matrix known as solar lepton mixing sum rules. In this article, we present a simple derivation of such solar sum rules, valid for arbitrary neutrino and charged lepton mixing angles and phases, assuming only {\\theta}13^{\

Peter Ballett; Stephen F. King; Christoph Luhn; Silvia Pascoli; Michael A. Schmidt

2014-11-13

445

DIGITAL IMAGE RESAMPLING BY MODIFIED B-SPLINE FUNCTIONS  

Microsoft Academic Search

We investigate the applicability of modified B-spline functions in digital image resampling tasks. We con- sider a modification that is based on the use of a linear combination of shifted B-splines of different degrees. By optimizing the weighting coefficients, we get interpolat- ing functions with improved frequency responses - flat- ter characteristics in the passband and a higher attenua- tion

Atanas Gotchev; Jussi Vesma; Tapio Saramäki; Karen Egiazarian

1964-01-01

446

Depth-weighted, mean soil permeability in Kansas  

USGS Publications Warehouse

This digital spatial data set provides information on the magnitude and spatial pattern of depth-weighted, mean soil permeability throughout the State of Kansas. The data set was assembled using 1:24,000-scale cartographic and attribute information on the spatial distribution and characteristics of Kansas soils. The data set is in grid (raster) format with a grid-cell size of 10,000 square meters.

Juracek, Kyle E.

2000-01-01

447

Weight and cost forecasting for advanced manned space vehicles  

NASA Technical Reports Server (NTRS)

A mass and cost estimating computerized methology for predicting advanced manned space vehicle weights and costs was developed. The user friendly methology designated MERCER (Mass Estimating Relationship/Cost Estimating Relationship) organizes the predictive process according to major vehicle subsystem levels. Design, development, test, evaluation, and flight hardware cost forecasting is treated by the study. This methodology consists of a complete set of mass estimating relationships (MERs) which serve as the control components for the model and cost estimating relationships (CERs) which use MER output as input. To develop this model, numerous MER and CER studies were surveyed and modified where required. Additionally, relationships were regressed from raw data to accommodate the methology. The models and formulations which estimated the cost of historical vehicles to within 20 percent of the actual cost were selected. The result of the research, along with components of the MERCER Program, are reported. On the basis of the analysis, the following conclusions were established: (1) The cost of a spacecraft is best estimated by summing the cost of individual subsystems; (2) No one cost equation can be used for forecasting the cost of all spacecraft; (3) Spacecraft cost is highly correlated with its mass; (4) No study surveyed contained sufficient formulations to autonomously forecast the cost and weight of the entire advanced manned vehicle spacecraft program; (5) No user friendly program was found that linked MERs with CERs to produce spacecraft cost; and (6) The group accumulation weight estimation method (summing the estimated weights of the various subsystems) proved to be a useful method for finding total weight and cost of a spacecraft.

Williams, Raymond

1989-01-01

448

Smoking status and weight loss in three weight loss programs  

Microsoft Academic Search

The purpose of the study was to examine differences in current, former, and never smokers' weight loss in three comprehensive weight loss programs. Archival data from 389 overweight participants enrolled in three comprehensive weight loss programs were analyzed. The programs differed in length and by type of diet (food-based low calorie diet, partial meal replacement low calorie diet, and supplement-based

Jennifer D. Lundgren; Patrick M. O'Neil; Corby K. Martin; Martin Binks

2006-01-01

449

Determination of intact splenic weight based on morcellated weight  

Microsoft Academic Search

Background: Comparisons of splenic size based on splenic weight are difficult after laparoscopic splenectomy, which results in a morcellated specimen. We report the results of a direct comparison between morcellated and intact splenic weights. Methods: Porcine spleens were harvested via a midline laparotomy, and an intact splenic weight was obtained, which served as the control. The spleen then was placed

R. M. Walsh; B. Chand; J. Brodsky; B. T. Heniford

2003-01-01

450

Digital ac monitor  

DOEpatents

An apparatus and method is provided for monitoring a plurality of analog ac circuits by sampling the voltage and current waveform in each circuit at predetermined intervals, converting the analog current and voltage samples to digital format, storing the digitized current and voltage samples and using the stored digitized current and voltage samples to calculate a variety of electrical parameters; some of which are derived from the stored samples. The non-derived quantities are repeatedly calculated and stored over many separate cycles then averaged. The derived quantities are then calculated at the end of an averaging period. This produces a more accurate reading, especially when averaging over a period in which the power varies over a wide dynamic range. Frequency is measured by timing three cycles of the voltage waveform using the upward zero crossover point as a starting point for a digital timer. 24 figs.

Hart, G.W.; Kern, E.C. Jr.

1987-06-09

451

Programmable digital modem  

NASA Technical Reports Server (NTRS)

Information on programmable digital modems (PDM) is given in viewgraph form. Topics covered include data rate range and operational modes, test and demonstration equipment, program goals, modulation formats, and PDM design challenges.

Kappes, M.

1992-01-01

452

The Signal: Digital Preservation  

NSDL National Science Digital Library

Librarians, information technology specialists, and others will find much to enjoy on this excellent collaborative blog created by the Library of Congress. Called "The Signal," it covers "exciting new developments that have an impact on digital preservation and access." There are 12 experts who contribute posts to the blog on a regular basis and there are well over 400 posts to browse through here. First-time visitors can look through the Categories area, which collects posts into themes such as Digital Content, Outreach and Events, and Tools and Infrastructure. Recent posts include "Hardware Matters," "What Do Researchers Want From Institutions that Preserve Digital Content?" and "Reality Check: What Most People Actually Do with Their Personal Digital Archives." Users are also encouraged to add their own comments and thoughts on each post or suggest materials for possible coverage by the site. [KMG

2013-06-05

453

Digital Humanities Now  

NSDL National Science Digital Library

Started in 2009, Digital Humanities Now (DHNow) is "an experimental edited publication that highlights and distributes informally published digital humanities scholarship and resources from the open web." A scrolling set of resources on the homepage features the Editor's Choice, which includes Grasping Technology, Trends in Digital Scholarship Centers, and other helpful topics. Moving on, visitors can look over job announcements in higher education, learn about upcoming conferences, and learn about funding opportunities. The Resources area is a gem offering helpful tools, such as the PressForward Plugin. Finally, a plethora of archived Reports are available, including meditations on Roman mapping, American art history and digital scholarship, and approaches to low-effort crowd sourcing.

454

Digital Curation Centre  

NSDL National Science Digital Library

The Digital Curation Centre (DCC) states as its motto: "because good research needs good data." Based in the United Kingdom, the DCC provides expert advice and helps those in the UK higher education and research communities store, manage, protect, and share digital research data. As such, the site is a great resource for information specialists, particularly librarians and academics. Visitors should make sure to check out the Digital Curation area which provides a bit of background on the field, along with information for newcomers to the field. The homepage also contains a neat feature entitled Editor's Choice, which brings together reports on digital preservation, information on new books, and much more. Also, visitors can sign up for the DCC's newsletter and take a look at its tag cloud. The Resources area should also not be missed as it features how-to guides, data management plans, case studies, and white papers.

455

Implantable digital hearing aid  

NASA Technical Reports Server (NTRS)

Hearing aid converts analog output of microphone into digital pulses in about 10 channels of audiofrequencies. Each pulse band could be directly connected to portion of auditory nerve most sensitive to that range.

Kissiah, A. M., Jr.

1979-01-01

456

Preservation of Digital Objects.  

ERIC Educational Resources Information Center

Presents a literature review that covers the following topics related to preservation of digital objects: practical examples; stakeholders; recordkeeping standards; genre-specific problems; trusted repository standards; preservation methods; preservation metadata standards; and future directions. (Contains 82 references.) (MES)

Galloway, Patricia

2004-01-01

457

Partitioned counting digital filter  

NASA Technical Reports Server (NTRS)

High-speed variation of counting digital filter implements count in a way which allows shortest permissible spacing between samples of input signal to be small fraction of time it takes to compute output sample.

Zohar, S.

1977-01-01

458

Digital chirp modulation  

NASA Astrophysics Data System (ADS)

A technique for digital chirp synthesis is described. The method involves storing the in-phase and quadrature components of a sampled chirp waveform in a high-speed memory element. The baseband chirp is directly applied to an IF carrier using digital-to-analog converters which in turn drive a linearized quadriphase modulator. Out-of-band alias and harmonic products are removable via a output bandpass filter, and PN chopping of both the data and carrier is performed in order to spread the carrier leakage through the quadriphase modulator hybrid. It is shown that digital chirp modulation is comparatively insensitive to the large insertion losses which are found in most analog SWD modulators. A 1-bit quantized version of the digital waveform for a 2 Delta-wide chirp from -Delta F to +Delta F is illustrated in graphic form.

Komara, M. A.; Andren, C. F.

459

Greenstone Digital Library Software  

NSDL National Science Digital Library

Greenstone is a suite of software designed to build and distribute digital library collections. Produced by the New Zealand Digital Library Project at the University of Waikato, this innovative tool was created to "empower users, particularly in universities, libraries, and other public service institutions, to build their own digital libraries." The software consists of the Collector, which helps create new collections, modify or add to existing ones, or delete collections; and the Administration, which allows the addition of new users, summarizes the collections in the system, and gives technical information on the installation. Also included is a section comprising the Greenstone manuals, and a section that tells about the Greenstone software and where the New Zealand Digital Library Project originated. The software runs on Windows and Unix, and both source codes and binaries are available for downloading on the site.

1969-12-31

460

Alexandria Digital Library (ADL)  

NSDL National Science Digital Library

The ADL collection provides searching capabilities over geographically-referenced materials. Geographically-referenced means information objects are associated with one or more regions, often called footprints, on the Earth's surface. The ADL collection contains information that supports basic science, including the Earth and social sciences. The ADL collection offers geospatial search as the primary search mechanism. This collection contains photographs, digital elevation models, digital raster graphics, Landsat and AVHRR (Advanced Very High Resolution Radiometer) satellite imagery and world maps.

461

Digital image processing  

NASA Technical Reports Server (NTRS)

The Federal Systems Division of IBM has developed an image processing facility to experimentally process, view, and record digital image data. This facility has been used to support LANDSAT digital image processing investigations and advanced image processing research and development. A brief description of the facility is presented, some techniques that have been developed to correct the image data are discussed, and some results obtained by users of the facility are described.

Bernstein, R.; Ferneyhough, D. G., Jr.

1975-01-01

462

Emerging Digital Economy II  

NSDL National Science Digital Library

An update of the 1998 US Department of Commerce document Emerging Digital Economy (reviewed in the April 17, 1998 Scout Report), the second volume of this annual report shows that, although ecommerce remains less than one percent of the retail share of the economy, it continues to grow, "outpacing last year's most optimistic projections." New chapters and analyses include "Contribution of Information Technology to Gross Product Originating Per Worker" and "Labor Markets in the Digital Economy."

Buckley, Patricia.; Cooke, Sandra.; Dumagan, Jess.; Gill, Gurmukh.; Henry, David.; Pastore, Dennis.

463

The Digital Earth  

NSDL National Science Digital Library

The Digital Earth is a virtual representation of our planet that enables a person to explore and interact with the vast amounts of natural, cultural, and historical information being gathered about the Earth. This video describes the need for such a system, possible uses of a Digital Earth system, and the technologies and organizations that must come together in order for it to become a reality.

Shirah, Greg; Kekesi, Alex; Snodgrass, Stuart; Allen, Jesse; Maher, Steve; Mitchell, Horace

1999-05-04

464

Survey of digital filtering  

NASA Technical Reports Server (NTRS)

A three part survey is made of the state-of-the-art in digital filtering. Part one presents background material including sampled data transformations and the discrete Fourier transform. Part two, digital filter theory, gives an in-depth coverage of filter categories, transfer function synthesis, quantization and other nonlinear errors, filter structures and computer aided design. Part three presents hardware mechanization techniques. Implementations by general purpose, mini-, and special-purpose computers are presented.

Nagle, H. T., Jr.

1972-01-01

465

Harmful Algae Digital Library  

NSDL National Science Digital Library

The Harmful Algae Digital Library contains a collection of Sea Grant documents in digital format (primarily PDF) arranged by subject area: red tide/PSP, brown tide, ciguatera, killer algae, and Pfiesteria. This collection is part of the National Sea Grant Library (NSGL), which maintains over 36,000 searchable records dedicated to environmental stewardship, long-term economic development and responsible use of America's coastal, ocean and Great Lakes resources.

Library, National S.; University Of Rhode Island-Bay Campus, Noaa

466

Digit ratio in birds.  

PubMed

The Homeobox (Hox) genes direct the development of tetrapod digits. The expression of Hox genes may be influenced by endogenous sex steroids during development. Manning (Digit ratio. New Brunswick, NJ: Rutgers University Press, 2002) predicted that the ratio between the lengths of digits 2 (2D) and 4 (4D) should be sexually dimorphic because prenatal exposure to estrogens and androgens positively influence the lengths of 2D and 4D, respectively. We measured digits and other morphological traits of birds from three orders (Passeriformes, house sparrow, Passer domesticus; tree swallow, Tachycineta bicolor; Pscittaciformes, budgerigar, Melopsittacus undulates; Galliformes, chicken, Gallus domesticus) to test this prediction. None were sexually dimorphic for 2D:4D and there were no associations between 2D:4D and other sexually dimorphic traits. When we pooled data from all four species after we averaged right and left side digits from each individual and z-transformed the resulting digit ratios, we found that males had significantly larger 2D:4D than did females. Tetrapods appear to be sexually dimorphic for 2D:4D with 2D:4D larger in males as in some birds and reptiles and 2D:4D smaller in males as in some mammals. The differences between the reptile and mammal lineages in the directionality of 2D:4D may be related to the differences between them in chromosomal sex determination. We suggest that (a) natural selection for a perching foot in the first birds may have overridden the effects of hormones on the development of digit ratio in this group of vertebrates and (b) caution be used in making inferences about prenatal exposure to hormones and digit ratio in birds. PMID:18833568

Lombardo, Michael P; Thorpe, Patrick A; Brown, Barbara M; Sian, Katie

2008-12-01

467

Digital protection in a digital age  

NASA Astrophysics Data System (ADS)

Non-Impact printing is now widely used for most computer hard copy output applications. In the area of production of valuable documents such as title deeds, negotiable documents, passports, insurance policies and cover notes amongst others the flexibility of utilising this method of personalisation is often taken for granted. The benefits of economy, flexibility and speed tend to mask the risks associated with creating documents in this manner. Because of the ease with which alteration and replication can occur on high value documents, users have to protect material using costly lamination processes or look for other ways of securing the images created. Methods of digital protection have been developed that enable images to be protected by embedded digital fingerprints that are unique and hidden within the image itself. The applications of such devices are widespread and they can also be used as tools to detect the authenticity of products through covert protection on labels and packaging printed by digital, colour non-impact printers such as Indigo & Xeikon. this paper will review some of the products offered and how they can be applied as practical solutions to the problems faced. Also highlighted will be the expected performance requirements of such systems and how they compare with alternative solutions such as 2D bar codes, image scarring and secondary encoding routines.

Plimmer, Jeremy J.

1998-04-01

468

Digital Elevation Models  

USGS Publications Warehouse

The Earth Science Information Center (ESIC) distributes digital cartographic/geographic data files produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program. Digital cartographic data files may be grouped into four basic types. The first of these, called a Digital Line Graph (DLG), is the line map information in digital form. These data files include information on base data categories, such as transportation, hypsography, hydrography, and boundaries. The second type, called a Digital Elevation Model (DEM), consists of a sampled array of elevations for a number of ground positions at regularly spaced intervals. The third type is Land Use and Land Cover digital data which provides information on nine major classes of land use such as urban, agricultural, or forest as well as associated map data such as political units and Federal land ownership. The fourth type, the Geographic Names Information System, provides primary information for all known places, features, and areas in the United States identified by a proper name.

U.S. Geological Survey

1993-01-01

469

Eating Well and Losing Weight  

MedlinePLUS

... Tools & Resources Stroke More Eating Well and Losing Weight Updated:May 20,2014 Eating the right foods ... risk of future heart problems. Good nutrition and weight control are a crucial part of your treatment ...

470

Weight and Diabetes (For Parents)  

MedlinePLUS

... who have type 1 or type 2 diabetes. Weight and Type 1 Diabetes Undiagnosed or untreated, type ... can have trouble controlling their blood sugar levels . Weight and Type 2 Diabetes Most people are overweight ...

471

Weight-Control Information Network  

MedlinePLUS

... Facebook Welcome to WIN The Weight-control Information Network provides the general public, health professionals, the media, ... niddk.nih.gov ; or write Weight-control Information Network, 1 WIN Way, Bethesda, MD 20892–3665. Last ...

472

Why Should I Lose Weight?  

MedlinePLUS

(continued) ANSWERS by heart Lifestyle + Risk Reduction Fitness + Weight Management How can I lose weight? It’s easy to start a diet. Staying on one is harder! Prepare yourself by setting goals, thinking ahead ...

473

Holistic Weight-Loss Strategies  

MedlinePLUS

... the weight-loss strategies psychologists often recommend include: Self-monitoring. One of the most effective tactics for reducing or managing weight is self-monitoring. That means systematically observing and recording what you ...

474

Weighted pebbling numbers on graphs  

E-print Network

We expand the theory of pebbling to graphs with weighted edges. In a weighted pebbling game, one player distributes a set amount of weight on the edges of a graph and his opponent chooses a target vertex and places a configuration of pebbles on the vertices. Player one wins if, through a series of pebbling moves, he can move at least one pebble to the target. A pebbling move of p pebbles across an edge with weight w leaves the floor of pw pebbles on the next vertex. We find the weighted pebbling numbers of stars, graphs with at least 2|V|-1 edges, and trees with given targets. We give an explicit formula for the minimum total weight required on the edges of a length-2 path, solvable with p pebbles and exhibit a graph which requires an edge with weight 1/3 in order to achieve its weighted pebbling number.

Jones, Stephanie; McLeman, Cameron; Nyman, Kathryn

2011-01-01

475

The Manin—Drinfeld theorem and Ramanujan sums  

Microsoft Academic Search

The Manin—Drinfeld theorem asserts the finiteness of the cuspidal divisor class group of a modular curve corresponding to\\u000a a congruence subgroup. The purpose of the note is to draw attention to the connection between this theorem and Ramanujan sums,\\u000a and to the question of what happens for non-congruence subgroups.

V. Kumar Murty; Dinakar Ramakrishnan

1987-01-01

476

A survey of limit laws for bootstrapped sums  

Microsoft Academic Search

Concentrating mainly on independent and identically distributed (i.i.d.) real-val- ued parent sequences, we give an overview of first-order limit theorems available for bootstrapped sample sums for Efron's bootstrap. As a light unifying theme, we expose by elementary means the relationship between corresponding conditional and unconditional bootstrap limit laws. Some open problems are also posed.

Sándor Csörg?; Andrew Rosalsky

2003-01-01

477

A Parametric Cumulative Sum Statistic for Person Fit  

ERIC Educational Resources Information Center

This article develops a new cumulative sum (CUSUM) statistic to detect aberrant item response behavior. Shifts in behavior are modeled with quadratic functions and a series of likelihood ratio tests are used to detect aberrancy. The new CUSUM statistic is compared against another CUSUM approach as well as traditional person-fit statistics. A…

Armstrong, Ronald D.; Shi, Min

2009-01-01

478

Exploring the Sums of Powers of Consecutive q-Integers  

ERIC Educational Resources Information Center

The Bernoulli numbers are among the most interesting and important number sequences in mathematics. They first appeared in the posthumous work "Ars Conjectandi" (1713) by Jacob Bernoulli (1654-1705) in connection with sums of powers of consecutive integers (Bernoulli, 1713; or Smith, 1959). Bernoulli numbers are particularly important in number…

Kim, T.; Ryoo, C. S.; Jang, L. C.; Rim, S. H.

2005-01-01

479

Two Different Approaches to Nonzero-Sum Stochastic Differential Games  

SciTech Connect

We make the link between two approaches to Nash equilibria for nonzero-sum stochastic differential games: the first one using backward stochastic differential equations and the second one using strategies with delay. We prove that, when both exist, the two notions of Nash equilibria coincide.

Rainer, Catherine [Departement de Mathematiques, Universite de Bretagne Occidentale, 6 avenue Victor-le-Gorgeu - CS 93837 (France)], E-mail: Catherine.Rainer@univ-brest.fr

2007-06-15

480

Locally Informed Global Search for Sums of Combinatorial Games  

E-print Network

Locally Informed Global Search for Sums of Combinatorial Games Martin M¨uller and Zhichao Li games. They can be characterized as local analysis and global search. Algorithms from combinatorial game depends mainly on the complexity of analyzing individual sub- games. Most importantly

MĂĽller, Martin

481

Zero-sum two-person games in LCP  

SciTech Connect

In zero-sum two-person games, von Neumann`s minimax theorem and Kaplansky`s theorem on completely mixed games play a significant role. We derive some new and interesting results in Linear complementarity problem using the above mentioned theorems, especially in identifying certain class of Q-matrices.

Parthasarathy, T.

1994-12-31

482

Sums of squares in function fields of hyperelliptic curves  

E-print Network

. Important field invari- ants in this context are the pythagoras number and the u-invariant. In the case, have also highlighted some outstanding open problems. The pythagoras number is the least upper bound orderings as a sum of squares. Assume that there is a common finite upper bound for the pythagoras number

483

Sums of squares in function fields of hyperelliptic curves  

E-print Network

. Important field invari­ ants in this context are the pythagoras number and the u­invariant. In the case, have also highlighted some outstanding open problems. The pythagoras number is the least upper bound orderings as a sum of squares. Assume that there is a common finite upper bound for the pythagoras number

484

ON SUMS OF SQUARES IN LOCAL RINGS CLAUS SCHEIDERER  

E-print Network

. On the quantitative side, we obtain explicit (finite) upper bounds for the Pythagoras number, for various classes, a regular 2­ dimensional local ring has finite Pythagoras number if and only if its quotient field does words and phrases. Sums of squares, semilocal rings, Pythagoras number, quadratic forms, orderings, real

485

ON SUMS OF SQUARES IN LOCAL RINGS CLAUS SCHEIDERER  

E-print Network

. On the quantitative side, we obtain explicit (finite) upper bounds for the Pythagoras number, for various classes, a regular 2- dimensional local ring has finite Pythagoras number if and only if its quotient field does words and phrases. Sums of squares, semilocal rings, Pythagoras number, quadratic forms, orderings, real

486

A local limit theorem for sums of dependent random variables  

Microsoft Academic Search

A local version of the central limit theorem is established for normalized sums of dependent random variables when a global theorem is known and conditional distributions are sufficiently smooth. The proof uses ideas from Statistics, by representing the density as the integral of a score function for a translation family of distributions.

Mei Wang; Michael Woodroofe

1990-01-01

487

INTRODUCTION INTO QCD SUM RULE APPROACH A.V. RADYUSHKIN  

E-print Network

the light-cone wave function (x, k) depending also on the transverse momentum k. I say "something like as a sum of terms of increasing complexity (see Fig.1). The first term (purely soft contribution, Fig.1a principles of QCD. To calculate the soft contribution to the form factor one should know something like

488

On Stirling numbers and Euler sums Victor Adamchik  

E-print Network

On Stirling numbers and Euler sums Victor Adamchik Wolfram Research Inc., 100 Trade Center Dr of Stirling numbers of the first kind for non­integer values of their arguments. We discuss the analytic representations of Stirling numbers through harmonic numbers, the generalized hy­ pergeometric function

Adamchik, Victor

489

The Sensitive Infrared Signal Detection by Sum Frequency Generation  

NASA Technical Reports Server (NTRS)

An up-conversion device that converts 2.05-micron light to 700 nm signal by sum frequency generation using a periodically poled lithium niobate crystal is demonstrated. The achieved 92% up-conversion efficiency paves the path to detect extremely weak 2.05-micron signal with well established silicon avalanche photodiode detector for sensitive lidar applications.

Wong, Teh-Hwa; Yu, Jirong; Bai, Yingxin

2013-01-01

490

Decay Constants of Beauty Mesons from QCD Sum Rules  

NASA Astrophysics Data System (ADS)

Our recently completed analysis of the decay constants of both pseudoscalar and vector beauty mesons reveals that in the bottom-quark sector two specific features of the sum-rule predictions show up: (i) For the input value of the bottom-quark mass in the M?S? scheme m?b(m?b) ? 4:18 GeV; the sum-rule result fB ? 210-220 MeV for the B meson decay constant is substantially larger than the recent lattice-QCD finding fB ? 190 MeV: Requiring QCD sum rules to reproduce the lattice-QCD value of fB yields a significantly larger b-quark mass: m?b(m?b) = 4:247 GeV: (ii) Whereas QCD sum-rule predictions for the charmed-meson decay constants fD; fDs, fD* and fDs* are practically independent of the choice of renormalization scale, in the beauty sector the results for the decay constants—and especially for the ratio fB* / fB—prove to be very sensitive to the specific scale setting.

Lucha, Wolfgang; Melikhov, Dmitri; Simula, Silvano

2014-11-01

491

New Unitary Relations between the QCD sum rules  

NASA Astrophysics Data System (ADS)

New unitary symmetry relations are obtained between the QCD sum rules for ?? transitions. Also for QCD SR's with baryon distribution amplitudes the unitary relations are constructed, proved in a simple quark model and found to be consistent with the existing calculations.

Ozpineci, Altug; Zamiralov, Valeri

2014-11-01

492

Sums over geometries and improvements on the mean field approximation  

SciTech Connect

The saddle points of a Lagrangian due to Efetov are analyzed. This Lagrangian was originally proposed as a tool for calculating systematic corrections to the Bethe approximation, a mean-field approximation which is important in statistical mechanics, glasses, coding theory, and combinatorial optimization. Detailed analysis shows that the trivial saddle point generates a sum over geometries reminiscent of dynamically triangulated quantum gravity, which suggests new possibilities to design sums over geometries for the specific purpose of obtaining improved mean-field approximations to D-dimensional theories. In the case of the Efetov theory, the dominant geometries are locally treelike, and the sum over geometries diverges in a way that is similar to quantum gravity's divergence when all topologies are included. Expertise from the field of dynamically triangulated quantum gravity about sums over geometries may be able to remedy these defects and fulfill the Efetov theory's original promise. The other saddle points of the Efetov Lagrangian are also analyzed; the Hessian at these points is nonnormal and pseudo-Hermitian, which is unusual for bosonic theories. The standard formula for Gaussian integrals is generalized to nonnormal kernels.

Sacksteder, Vincent E. IV [S.N. Bose National Centre for Basic Sciences, Sector III, Block JD, Salt Lake, Kolkata 700098 (India)

2007-11-15

493

Log shifted gamma approximation to lognormal sum distributions  

Microsoft Academic Search

This paper proposes the log shifted gamma (LSG) approximation to model the sum of M lognormal distributed random variables. The closed-form probability density function (PDF) of the resulting LSG random variable (RV) is presented and its parameters are derived from those of the M individual lognormal RV by using an iterative moment matching technique. Simulation results on the cumulative distribution

C. L. Joshua Lam; Tho Le-Ngoc

2005-01-01

494

Infinite sums, diophantine equations and Fermat's last theorem1  

E-print Network

chapter in an epic initiated around 1630, when Pierre de Fermat wrote in the margin of his Latin version Congr`es de l'Association Math´ematique du Qu´ebec. 1 #12;Fermat's Last Theorem. The equation xn + ynInfinite sums, diophantine equations and Fermat's last theorem1 Henri DARMON and Claude LEVESQUE

Darmon, Henri

495

Embeddings of Topological Graphs: Lossy Invariants, Linearization, and 2Sums  

Microsoft Academic Search

Abstract We study the properties of embeddings, multicom- modity flows, and sparse cuts in minor-closed families of graphs which are also closed under 2-sums; this in- cludes planar graphs, graphs of bounded treewidth, and constructions based on recursive edge replacement. In particular, we show the following. † Every graph which excludes K4 as a minor (in par-

Amit Chakrabarti; Alexander Jaffe; James R. Lee; Justin Vincent

2008-01-01

496

Linear Sum Assignment Algorithms for Distributed Multi-robot Systems  

E-print Network

mechanisms. This dissertation addresses the classic task assignment problems in which robots and tasks are eventually matched by forming a one-to-one mapping, and their overall performances (e.g., cost, utility, and risk) can be linearly summed. At a high...

Liu, Lantao

2013-04-30

497

Sum-frequency generation from photon number squeezed light  

NASA Technical Reports Server (NTRS)

We investigate the quantum fluctuations of the fields produced in sum-frequency (SF) generation from light initially in the photon number squeezed state. It is found that, to the fourth power term, the output SF light is sub-Poissonian whereas the quantum fluctuations of the input beams increase. Quantum anticorrelation also exists in SF generation.

Wu, Ling-An; Du, Cong-Shi; Wu, Mei-Juan; Li, Shi-Qun

1994-01-01

498

A new approximate sum rule for bulk alloy properties  

NASA Technical Reports Server (NTRS)

A new, approximate sum rule is introduced for determining bulk properties of multicomponent systems, in terms of the pure components properties. This expression is applied for the study of lattice parameters, cohesive energies, and bulk moduli of binary alloys. The correct experimental trends (i.e., departure from average values) are predicted in all cases.

Bozzolo, Guillermo; Ferrante, John

1992-01-01

499

Making Tens: Finding Addends That Sum to Ten  

NSDL National Science Digital Library

In this lesson students find and record addends that sum to ten in three different activities, using ten frames, linking cubes, two-sided counters, and a concentration game. The lesson includes suggestions for assessment and extension, reflection questions for students and teachers, links to related resources, and printable materials (pdf).

Kunze, Susan A.

2014-01-01

500

Inequalities for frequency-moment sum rules of electron liquids  

NASA Technical Reports Server (NTRS)

The relations between the various frequency-moment sum rules of electron liquids, which include even-power moments, are systematically examined by using the Cauchy-Schwarz and Hoelder inequalities. A relation involving the isothermal sound velocity and the kinetic and potential energies is obtained from one of the inequalities in the long-wavelength limit, and is generalized to arbitrary spatial dimensions.

Iwamoto, N.

1986-01-01