These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Sampling problems  

NASA Technical Reports Server (NTRS)

Precipitation estimates from satellites are subject to a number of uncertainties involving design characteristics, satellite positioning, natural variability of precipitation, and the noncontinuous acquisition of data. The sources and sizes of these uncertainties are in need of proper evaluation and estimation. The present sampling and estima-theory seems to be adequate for some measurement problems (e.g., determining precipitation at a point), while others require further theoretical work (e.g., determining the time history of precipitation over large areas).

Flueck, J. A.; Crane, R. F.; Laughlin, C. R.; Bell, T. L.; Meiten, J. G.; Ruprecht, E.; Short, D. R.; Theon, J. S.; Vogel, J. L.

1981-01-01

2

Problems involving combined loading  

NASA Technical Reports Server (NTRS)

The first problem was to determine the capability of a ground support equipment (GSE) rack knee bracket for handling a spacelab rack. The geometric center of gravity was calculated for the upper and lower part of the rack and found to be in the center of gravity's allowable envelope. The second problem was to determine the exact margin of safety for an axial load and a shear load on a bolt. The equation for failure is axial load squared plus shear load cubed equal one. The third problem was to simplify an expression for stress on a generic non-symmetrical bolt configuration to a form familiar to 'bolt people'. The final problem was the structural analysis of the spacelab rack corner posts.

Miller, Lunelle

1992-01-01

3

Multiple Solutions Involving Geoboard Problems.  

ERIC Educational Resources Information Center

Illustrates various methods to determine the perimeter and area of triangles and polygons formed on the geoboard. Methods utilize algebraic techniques, trigonometry, geometric theorems, and analytic geometry to solve problems and connect a variety of mathematical concepts. (MDH)

Smith, Lyle R.

1993-01-01

4

Adaptive sampling for noisy problems  

SciTech Connect

The usual approach to deal with noise present in many real-world optimization problems is to take an arbitrary number of samples of the objective function and use the sample average as an estimate of the true objective value. The number of samples is typically chosen arbitrarily and remains constant for the entire optimization process. This paper studies an adaptive sampling technique that varies the number of samples based on the uncertainty of deciding between two individuals. Experiments demonstrate the effect of adaptive sampling on the final solution quality reached by a genetic algorithm and the computational cost required to find the solution. The results suggest that the adaptive technique can effectively eliminate the need to set the sample size a priori, but in many cases it requires high computational costs.

Cantu-Paz, E

2004-03-26

5

Regularization of Inverse Visual Problems Involving Discontinuities  

Microsoft Academic Search

Inverse problems, such as the reconstruction problems that arise in early vision, tend to be mathematically ill-posed. Through regularization, they may be reformulated as well-posed variational principles whose solutions are computable. Standard regularization theory employs quadratic stabilizing functionals that impose global smoothness constraints on possible solutions. Discontinuities present serious difficulties to standard regularization, however, since their reconstruction requires a precise

Demetri Terzopoulos

1986-01-01

6

Problems pilots face involving wind shear  

NASA Technical Reports Server (NTRS)

Educating pilots and the aviation industry about wind shears presents a major problem associated with this meteorological phenomenon. The pilot's second most pressing problem is the need for a language to discuss wind shear encounters with other pilots so that the reaction of the aircraft to the wind shear encounter can be accurately described. Another problem is the flight director which gives a centered pitch command for a given angular displacement from the glide slope. It was suggested that they should instead be called flight path command and should not center unless the aircraft is actually correcting to the flight path.

Melvin, W. W.

1977-01-01

7

3.OA Analyzing Word Problems Involving Multiplication  

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: Many problems can be solved in different ways. Decide if the following word problems can be solved using multiplication. Explain your thinking. Then so...

8

Physics Suite Sample Problems: Magnetism  

NSDL National Science Digital Library

This page contains a series of problems on the topic of magnetism developed for use with The Physics Suite, an activity-based learning project. Each problem was designed to help build qualitative understanding of physics and was built around student acquisition of knowledge as observed in recent studies. The problems vary in format and include estimation, context-based reasoning, multiple choice, short answer, qualitative questions, and essay questions. The topics include magnetic forces and fields, magnetic induction, mass spectrometers, Ampere's Law, inducing current, and Faraday's Law. This item is part of a larger collection of problems, in-class questions, and interactive resources developed by the University of Maryland Physics Education Research Group.

Redish, Edward F.

2008-07-22

9

Parent Involvement, Emotional Support, and Behavior Problems: An Ecological Approach  

ERIC Educational Resources Information Center

We examined relations between parent involvement and kindergarten students' behavior problems in classrooms with varying levels of teacher emotional support. Multi-informant data were collected on "n" = 255 low-income Black and Hispanic students, and "n" = 60 kindergarten classrooms in the baseline year of an intervention…

McCormick, Meghan P.; Cappella, Elise; O'Connor, Erin E.; McClowry, Sandee G.

2013-01-01

10

Breadth and depth involvement: Understanding Internet gambling involvement and its relationship to gambling problems.  

PubMed

The "involvement effect" refers to the finding that controlling for gambling involvement often reduces or eliminates frequently observed game-specific associations with problem gambling. In other words, broader patterns of gambling behavior, particularly the number of types of games played over a defined period, contribute more to problem gambling than playing specific games (e.g., lottery, casino, Internet gambling). This study extends this burgeoning area of inquiry in three primary ways. First, it tests independently and simultaneously the predictive power of two gambling patterns: breadth involvement (i.e., the number of games an individual plays) and depth involvement (i.e., the number of days an individual plays). Second, it includes the first involvement analyses of actual betting activity records that are associated with clinical screening information. Third, it evaluates and compares the linearity of breadth and depth effects. We conducted analyses of the actual gambling activity of 1,440 subscribers to the bwin.party gambling service who completed an online gambling disorder screen. In all, 11 of the 16 games we examined had a significant univariate association with a positive screen for gambling disorder. However, after controlling for breadth involvement, only Live Action Internet sports betting retained a significant relationship with potential gambling-related problems. Depth involvement, though significantly related to potential problems, did not impact game-based gambling disorder associations as much as breadth involvement. Finally, breadth effects appeared steeply linear, with a slight quadratic component manifesting beyond four games played, but depth effects appeared to have a strong linear component and a slight cubic component. PMID:23915365

LaPlante, Debi A; Nelson, Sarah E; Gray, Heather M

2014-06-01

11

The New Workforce Generation: Understanding the Problems Facing Parental Involvement in Jordanian Kindergartens  

ERIC Educational Resources Information Center

This study aimed to investigate the problems facing parental involvement in Jordanian kindergartens from the parents' perspectives. A 36-item questionnaire that addressed five domains was designed by the researchers and distributed among the study participants. The study sample consisted of 297 parents of kindergarten children from various…

Ihmeideh, Fathi; Khasawneh, Samer; Mahfouz, Safi; Khawaldeh, Moustafa

2008-01-01

12

Power and Sample Size Calculations for Studies Involving Linear Regression  

Microsoft Academic Search

This article presents methods for sample size and power calculations for studies involving linear regression. These approaches are applicable to clinical trials designed to detect a regression slope of a given magnitude or to studies that test whether the slopes or intercepts of two independent regression lines differ by a given amount. The investigator may either specify the values of

William D. Dupont; Walton D. Plummer

1998-01-01

13

The Effect of Teacher's Invitations to Parental Involvement on Children's Externalizing Problem Behaviors: An  

E-print Network

1 The Effect of Teacher's Invitations to Parental Involvement on Children's Externalizing Problem to parental involvement on children's externalizing problem behaviors: An examination of a CBC intervention, & Snyder, 2002); thus, interventions need to involve parents and teachers alike. Teacher Invitations

Farritor, Shane

14

Multiscale treatment of mechanical contact problems involving thin polymeric layers  

NASA Astrophysics Data System (ADS)

We propose a strategy to obtain a hyperelastic constitutive law for film-like systems from molecular dynamics (MD) simulations. The aim is to furnish a computationally efficient continuum model with this description of the material. In particular, two different methods are suggested, both of which consist of virtual experiments that are performed on the material to sample systematically the stress-strain relation. The latter is then fitted to a suitable functional form. We use a polymeric self-assembled monolayer, which spans a height of only a few nanometers, as a test case. Having determined the response function, we then apply it within a finite-element simulation of a continuum mechanical nanoindentation problem. Several contact quantities such as normal reaction forces and the contact geometry are extracted from these calculations and are compared to those from an analogous, fully atomistic nanoindentation simulation. We find that the considered benchmark quantities as obtained from the continuum surrogate model reproduce well the corresponding values of the MD simulation.

Schmidt, Marcus G.; Sauer, Roger A.; Ismail, Ahmed E.

2014-06-01

15

Physics Suite Sample Problems: Modern Physics  

NSDL National Science Digital Library

This is a collection of introductory physics problems on topics in 20th century physics. The questions are designed for active learning classrooms and are built around research on student acquisition of knowledge. The problems vary in format and include context-based reasoning, multiple choice, estimation, and essay questions. The topics include conservation of mass and energy, nuclear decay, wave-particle duality, and spectroscopy. This item is part of a larger collection of problems, in-class questions, and interactive resources developed by the University of Maryland Physics Education Research Group.

Redish, Edward F.

2005-08-09

16

Crack problems involving nonhomogeneous interfacial regions in bonded materials  

NASA Technical Reports Server (NTRS)

Consideration is given to two classes of fracture-related solid mechanics problems in which the model leads to some physically anomalous results. The first is the interface crack problem associated with the debonding process in which the corresponding elasticity solution predicts severe oscillations of stresses and the crack surface displacements vary near the crack tip. The second deals with crack intersecting the interface. The nature of the solutions around the crack tips arising from these problems is reviewed. The rationale for introducing a new interfacial zone model is discussed, its analytical consequences within the context of the two crack-problem classes are described, and some examples are presented.

Erdogan, F.

1990-01-01

17

CAUSES OF PROBLEMS IN ANALYZING PE SAMPLES  

EPA Science Inventory

The U.S. EPA's Environmental Monitoring Systems Laboratory in Las Vegas (EMSL-LV), is responsible for overseeing quality assurance of EPA's Superfund Contract Laboratory Program. n part, this oversight role involves examining QA data provided by the labs in order to investigate p...

18

Rigorous Solutions of Electromagnetic Problems Involving Hundreds of Millions  

E-print Network

-of-the-art technology. Hence, many electromagnetic problems in the literature have been solved by resorting to various and radar-eluding stealth airborne targets,radiation from antennas and electronic devices,and transmission

Gürel, Levent

19

Variational stability of optimal control problems involving subdifferential operators  

SciTech Connect

This paper is concerned with the problem of minimizing an integral functional with control-nonconvex integrand over the class of solutions of a control system in a Hilbert space subject to a control constraint given by a phase-dependent multivalued map with closed nonconvex values. The integrand, the subdifferential operators, the perturbation term, the initial conditions and the control constraint all depend on a parameter. Along with this problem, the paper considers the problem of minimizing an integral functional with control-convexified integrand over the class of solutions of the original system, but now subject to a convexified control constraint. By a solution of a control system we mean a 'trajectory-control' pair. For each value of the parameter, the convexified problem is shown to have a solution, which is the limit of a minimizing sequence of the original problem, and the minimal value of the functional with the convexified integrand is a continuous function of the parameter. This property is commonly referred to as the variational stability of a minimization problem. An example of a control parabolic system with hysteresis and diffusion effects is considered. Bibliography: 24 titles.

Tolstonogov, Aleksandr A [Institute of System Dynamics and Control Theory, Siberian Branch of the Russian Academy of Sciences, Irkutsk (Russian Federation)

2011-04-30

20

Solving the Small Sample Size Problem of LDA  

Microsoft Academic Search

The small sample size problem is often encountered in pattern recognition. It results in the singularity of the within-class scatter matrix Sw in Linear Discriminant Analysis (LDA). Different methods have been proposed to solve this problem in face recognition literature. Some methods reduce the dimension of the original sample space and hence unavoidably remove the null space of Sw, which

Rui Huang; Qingshan Liu; Hanqing Lu; Songde Ma

2002-01-01

21

Unresolved Issues in Adult Children's Marital Relationships Involving Intergenerational Problems.  

ERIC Educational Resources Information Center

When their first child was 5, 30 couples discussed an unresolved issue in their marital relationship that involved one of their parents, and how they would resolve this issue. Five intergenerational themes were identified in these disagreements: balancing nuclear vs. extended family time, changing rules and roles, pleasing parents vs. spouse,…

Beaton, John M.; Norris, Joan E.; Pratt, Michael W.

2003-01-01

22

Developments in the Extended Finite Element Method and Algebraic Multigrid for Solid Mechanics Problems Involving Discontinuities.  

E-print Network

??In this dissertation, some contribututions related to computational modeling and solution of solid mechanics problems involving discontinuities are discussed. The main tool employed for discrete… (more)

Hiriyur, Badri Krishna Jainath

2012-01-01

23

Comorbid Problem Gambling and Major Depression in a Community Sample.  

PubMed

Major depression is among the most common comorbid conditions in problem gambling. However, little is known about the effects of comorbid depression on problem gambling. The present study examined the prevalence of current major depression among problem gamblers (N = 105) identified from a community sample of men and women in Alberta, and examined group differences in gambling severity, escape motivation for gambling, family functioning, childhood trauma, and personality traits across problem gamblers with and without comorbid depression. The prevalence of major depression among the sample of problem gamblers was 32.4 %. Compared to problem gamblers without depression (n = 71), problem gamblers with comorbid depression (n = 34) reported more severe gambling problems, greater history of childhood abuse and neglect, poorer family functioning, higher levels of neuroticism, and lower levels of extraversion, agreeableness, and conscientiousness. Furthermore, the problem gamblers with comorbid depression had greater levels of childhood abuse and neglect, worse family functioning, higher neuroticism, and lower agreeableness and conscientiousness than a comparison sample of recreational gamblers with depression (n = 160). These findings underscore the need to address comorbid depression in assessment and treatment of problem gambling and for continued research on how problem gambling is related to frequently co-occurring disorders such as depression. PMID:25112217

Quigley, Leanne; Yakovenko, Igor; Hodgins, David C; Dobson, Keith S; El-Guebaly, Nady; Casey, David M; Currie, Shawn R; Smith, Garry J; Williams, Robert J; Schopflocher, Don P

2014-08-12

24

New approach to the fault location problem using synchronized sampling  

E-print Network

This thesis presents a new approach to solving the problem of fault location on a transmission line using synchronized data from both ends of the line. The synchronized phase voltage and current samples taken during the fault transient are used...

Mrkic, Jasna

2012-06-07

25

Association between Parental Involvement in School and Child Conduct, Social, and Internalizing Problems: Teacher Report  

ERIC Educational Resources Information Center

The present study examined the factor structure of the Teacher Involvement Questionnaire (Involve-T) by means of exploratory factor analysis and examined the association between children's socio-emotional and behavioural problems and teacher-reported parental involvement in school, using structural equation modelling. The study was conducted with…

Kirkhaug, Bente; Drugli, May Britt; Klockner, Christian A.; Morch, Willy-Tore

2013-01-01

26

MORSE Monte Carlo radiation transport code system. [Sample problems  

SciTech Connect

For a number of years the MORSE user community has requested additional help in setting up problems using various options. The sample problems distributed with MORSE did not fully demonstrate the capability of the code. At Oak Ridge National Laboratory the code originators had a complete set of sample problems, but funds for documenting and distributing them were never available. Recently the number of requests for listings of input data and results for running some particular option the user was trying to implement has increased to the point where it is not feasible to handle them on an individual basis. Consequently it was decided to package a set of sample problems which illustrates more adequately how to run MORSE. This write-up may be added to Part III of the MORSE report. These sample problems include a combined neutron-gamma case, a neutron only case, a gamma only case, an adjoint case, a fission case, a time-dependent fission case, the collision density case, an XCHEKR run and a PICTUR run.

Emmett, M.B.

1984-07-02

27

The discrete Kramer sampling theorem and indeterminate moment problems  

NASA Astrophysics Data System (ADS)

In this paper we propose candidates to be the kernel appearing in the discrete Kramer sampling theorem. These kernels arise either from orthonormal polynomials associated with indeterminate Hamburger or Stieltjes moment problems, or from the second kind orthogonal polynomials associated with the former ones. The sampling points are given by the zeros of the denominator in the Nevanlinna parametrization of the N-extremal measures. Explicit formulae are given associated with some cases where the Nevanlinna parametrization is known explicitly.

García, Antonio G.; Hernández-Medina, Miguel A.

2001-09-01

28

Examining Masculinity Norms, Problem Drinking, and Athletic Involvement as Predictors of Sexual Aggression in College Men  

ERIC Educational Resources Information Center

Male sexual aggression toward women is a serious social problem, particularly on college campuses. In this study, college men's sexually aggressive behavior and rape myth acceptance were examined using conformity to 11 masculine norms and 2 variables previously linked to sexual aggression: problem drinking and athletic involvement. Results…

Locke, Benjamin D.; Mahalik, James R.

2005-01-01

29

Parabolic equation solution of seismo-acoustics problems involving variations in bathymetry and sediment thickness  

E-print Network

Parabolic equation solution of seismo-acoustics problems involving variations in bathymetry to extend this approach to a larger class of seismo-acoustics problems. The variable rotated parabolic equation J. Acoust. Soc. Am. 120, 3534­3538 2006 handles a sloping fluid-solid interface at the ocean

30

Maternal Depressive Symptoms and Child Behavior Problems among Latina Adolescent Mothers: The Buffering Effect of Mother-Reported Partner Child Care Involvement  

ERIC Educational Resources Information Center

We examined the relations between maternal depressive symptoms and child internalizing and externalizing problems in a sample of 125 adolescent Latina mothers (primarily Puerto Rican) and their toddlers. We also tested the influence of mother-reported partner child care involvement on child behavior problems and explored mother-reported partner…

Smith, Erin N.; Grau, Josefina M.; Duran, Petra A.; Castellanos, Patricia

2013-01-01

31

Regularized discriminant analysis for the small sample size problem in face recognition  

E-print Network

Regularized discriminant analysis for the small sample size problem in face recognition Juwei Lu sample size'' (SSS) problem arising from the small number of available training samples compared. Keywords: Linear discriminant analysis; Quadratic discriminant analysis; Small sample size; Regularization

Plataniotis, Konstantinos N.

32

First Evidence of Comorbidity of Problem Gambling and Other Psychiatric Problems in a Representative Urban Sample of South Africa.  

PubMed

We investigate the extent to which problem gambling in a recent South African sample, as measured by the Problem Gambling Severity Index (PGSI), is comorbid with depression, anxiety and substance abuse. Data are from the 2010 South African National Urban Prevalence Study of Gambling Behavior. A representative sample of the urban adult population in South Africa (N = 3,000). Responses to the 9-item PGSI and ratings on the Beck Depression Index, the Beck Anxiety Inventory, and the World Health Organization Alcohol, Smoking and Substance Involvement Screening Tool (WHO ASSIST). Cross tabulations and Chi square analyses along with logistic regression analyses with and without controls for socio-demographic and/or socio-economic variables were used to identify comorbidities. The prevalence of depression, anxiety, alcohol and substance use were clearly higher among the sample at risk for problem gambling. Black African racial status and living in areas characterized by migrant mining workers was associated with increased risk of problem gambling and comorbidities. There is strong evidence that findings of comorbidities between pathological gambling and depression, anxiety and substance abuse in developed countries generalize to the developing country of South Africa. Historical context, however, gives those comorbidities a unique demographic distribution. PMID:24927870

Sharp, Carla; Dellis, Andrew; Hofmeyr, Andre; Kincaid, Harold; Ross, Don

2014-06-14

33

On the continuous dependence with respect to sampling of the linear quadratic regulator problem for distributed parameter systems  

NASA Technical Reports Server (NTRS)

The convergence of solutions to the discrete or sampled time linear quadratic regulator problem and associated Riccati equation for infinite dimensional systems to the solutions to the corresponding continuous time problem and equation, as the length of the sampling interval (the sampling rate) tends toward zero (infinity) is established. Both the finite and infinite time horizon problems are studied. In the finite time horizon case, strong continuity of the operators which define the control system and performance index together with a stability and consistency condition on the sampling scheme are required. For the infinite time horizon problem, in addition, the sampled systems must be stabilizable and detectable, uniformly with respect to the sampling rate. Classes of systems for which this condition can be verified are discussed. Results of numerical studies involving the control of a heat/diffusion equation, a hereditary of delay system, and a flexible beam are presented and discussed.

Rosen, I. G.; Wang, C.

1990-01-01

34

On the continuous dependence with respect to sampling of the linear quadratic regulator problem for distributed parameter system  

NASA Technical Reports Server (NTRS)

The convergence of solutions to the discrete- or sampled-time linear quadratic regulator problem and associated Riccati equation for infinite-dimensional systems to the solutions to the corresponding continuous time problem and equation, as the length of the sampling interval (the sampling rate) tends toward zero(infinity) is established. Both the finite-and infinite-time horizon problems are studied. In the finite-time horizon case, strong continuity of the operators that define the control system and performance index, together with a stability and consistency condition on the sampling scheme are required. For the infinite-time horizon problem, in addition, the sampled systems must be stabilizable and detectable, uniformly with respect to the sampling rate. Classes of systems for which this condition can be verified are discussed. Results of numerical studies involving the control of a heat/diffusion equation, a hereditary or delay system, and a flexible beam are presented and discussed.

Rosen, I. G.; Wang, C.

1992-01-01

35

Introduction This work is concerned with the exterior structural acoustics problem involving the  

E-print Network

Chapter 1 Introduction This work is concerned with the exterior structural acoustics problem involving the interaction of vibrating structures submerged in an infinite acoustic fluid and requires solution of the coupled wave equation subject to a far­field radiation condition. The acoustic fluid

Thompson, Lonny L.

36

Personifying self in physics problem situations involving forces as a student help strategy  

NASA Astrophysics Data System (ADS)

How can physics teachers best guide students regarding physics problem situations involving forces? A suggestion is made here to personify oneself as the object in question, that is, to pretend to be the object undergoing forces and then qualify and quantify those forces according to their vectors for the system at hand. This personification is not meant to empower the object to act, just to sense the forces it is experiencing. This strategy may be especially useful to beginning physics learners attacking problems that involve both multiple forces AND multiple objects, since each object acted upon needs to be considered separately, using the idea that one cannot be two places at once. An example of this type of problem expounded on here is Atwood's machine: two weights hung over a pulley with a single rope. Another example given is electromagnetic forces on one charge caused by other charges in the vicinity. Discussion is made on implementation of classroom strategies.

Tabor-Morris, A. E.

2013-03-01

37

Logistic analysis of epidemiologic studies with augmentation sampling involving re-stratification and population expansion.  

PubMed

Epidemiologic cross-sectional, case-cohort, or case-control studies often select augmentation samples to supplement an existing (baseline) sample, primarily for the two reasons: (1) to increase the sample sizes from certain subdomains of interest that were not originally considered in the design of the baseline study and (2) to obtain samples from an extension of the target population. To address these two objectives, two-stage stratified sample designs are considered, where the stratification based on the expanded population at the second stage is not nested in the first stage strata. The sample weighting and Taylor linearization variance estimation for the two-stage stratified sample designs, involving re-stratification and population expansion, are provided for estimating population totals and logistic regression coefficients. Results from limited simulation studies and a logistic regression analysis of a study of human papillomavirus serology are provided. PMID:24907707

Li, Yan; Safaeian, Mahboobeh; Robbins, Hilary A; Graubard, Barry I

2015-01-01

38

Finite difference methods for two-point boundary value problems involving high order differential equations  

Microsoft Academic Search

We discuss the construction of finite difference schemes for the two-point nonlinear boundary value problem:y(2n)+f(x,y)=0,y(2j)(a)=A2j,y(2j)(b)=B2j,j=0(1)n?1,n?2. In the case of linear differential equations, these finite difference schemes lead to (2n+1)-diagonal linear systems. We consider in detail methods of orders two, four and six for two-point boundary value problems involving a fourth order differential equation; convergence of these methods is established and

M. M. Chawla; C. P. Katti

1979-01-01

39

Hybrid transfinite element modeling/analysis of nonlinear heat conduction problems involving phase change  

NASA Technical Reports Server (NTRS)

The present paper describes the applicability of hybrid transfinite element modeling/analysis formulations for nonlinear heat conduction problems involving phase change. The methodology is based on application of transform approaches and classical Galerkin schemes with finite element formulations to maintain the modeling versatility and numerical features for computational analysis. In addition, in conjunction with the above, the effects due to latent heat are modeled using enthalpy formulations to enable a physically realistic approximation to be dealt computationally for materials exhibiting phase change within a narrow band of temperatures. Pertinent details of the approach and computational scheme adapted are described in technical detail. Numerical test cases of comparative nature are presented to demonstrate the applicability of the proposed formulations for numerical modeling/analysis of nonlinear heat conduction problems involving phase change.

Tamma, Kumar K.; Railkar, Sudhir B.

1988-01-01

40

A primal-dual algorithm for the fermat-weber problem involving mixed gauges  

Microsoft Academic Search

We give a new algorithm for solving the Fermat-Weber location problem involving mixed gauges. This algorithm, which is derived\\u000a from the partial inverse method developed by J.E. Spingarn, simultaneously generates two sequences globally converging to\\u000a a primal and a dual solution respectively. In addition, the updating formulae are very simple; a stopping rule can be defined\\u000a though the method is

C. MICHELOTand; O. Lefebvre

1987-01-01

41

Nonlinear approaches for the single-distance phase retrieval problem involving regularizations with sparsity constraints.  

PubMed

The phase retrieval process is a nonlinear ill-posed problem. The Fresnel diffraction patterns obtained with hard x-ray synchrotron beam can be used to retrieve the phase contrast. In this work, we present a convergence comparison of several nonlinear approaches for the phase retrieval problem involving regularizations with sparsity constraints. The phase solution is assumed to have a sparse representation with respect to an orthonormal wavelets basis. One approach uses alternatively a solution of the nonlinear problem based on the Fréchet derivative and a solution of the linear problem in wavelet coordinates with an iterative thresholding. A second method is the one proposed by Ramlau and Teschke which generalizes to a nonlinear problem the classical thresholding algorithm. The algorithms were tested on a 3D Shepp-Logan phantom corrupted by white Gaussian noise. The best simulation results are obtained by the first method for the various noise levels and initializations investigated. The reconstruction errors are significantly decreased with respect to the ones given by the classical linear phase retrieval approaches. PMID:23759845

Davidoiu, Valentina; Sixou, Bruno; Langer, Max; Peyrin, Francoise

2013-06-10

42

Hybrid equation approach for the solution of electromagnetic scattering problems involving arbitrarily shaped inhomogeneous dielectric bodies  

NASA Astrophysics Data System (ADS)

A numerical procedure is presented for use in the solution of electromagnetic scattering problems involving arbitrarily shaped inhomogeneous dielectric bodies. The solution procedure has been developed in such a way that fairly large scatters should be amenable to treatment via sparse matrix techniques or iteration and, in addition, so that other scatterers may be included in the vicinity of the inhomogeneous body with the usual simplicity of moment method formulations. The scattering problems are formulated via hybrid integral equation/partial differential equation approach in which the inhomogeneous region is modeled by the partial differential equations for the electric or magnetic field directly, while the radiation condition is incorporated via integral equation at the surface of the homogeneous body. The method of moments is applied so that existing surface integral equation computer codes for homogeneous bodies can be used, with only minor alterations, to generate the block of the matrix corresponding to the equivalent surface current interactions.

Gong, Z.; Glisson, A. W.

1985-12-01

43

Involvement in Intimate Partner Psychological Abuse and Suicide Proneness in College Women: Alcohol Related Problems as a Potential Mediator  

PubMed Central

This study examined the relations among involvement in intimate partner psychological abuse, alcohol-related problems, and suicide proneness as measured by the Life Attitudes Schedule – Short Form (LAS-SF) in college women (N = 709). Results revealed that, as expected, being involved in a psychologically abusive relationship was significantly and positively correlated with alcohol-related problems and alcohol-related problems were significantly and positively correlated with suicide proneness. Additionally, the intimate partner psychological abuse involvement-suicide proneness link was significantly mediated by alcohol-related problems. Implications are offered for the improved identification and treatment of young women at risk for suicidal and health-diminishing behaviors. PMID:20544000

Lamis, Dorian A.; Malone, Patrick S.; Langhinrichsen-Rohling, Jennifer

2010-01-01

44

On the application of the genetic algorithm to the predictability problems involving "on-off" switches  

NASA Astrophysics Data System (ADS)

On the application of the genetic algorithm to the predictability problems involving "on-off" switches ZHENG Qin(1,2), DAI Yi(1), ZHANG Lu(1)and LU Xiaoqing(1) (1)Institute of Science, PLA University of Science and Technology, Nanjing 211101, China; (2)State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China Abstract The lower bound of maximum predictable time can be formulated into a constrained nonlinear optimization problem, and the traditional solution to this problem is the filtering method and the conditional nonlinear optimal perturbation (CNOP) method. Usually, the CNOP method is implemented with the help of a gradient descent algorithm based on the adjoint method, which is named as the ADJ-CNOP, hereinafter. However, with the increasing improvement of actual prediction models, more and more physical processes are taken into consideration in models in the form of parameterization, thus giving rise to the "on-off" switch problem, which affects tremendously the effectiveness of the conventional gradient descent algorithm based on the adjoint method. This paper attempts to apply a genetic algorithm (GA) to the CNOP method, named as the GA-CNOP, to solve the predictability problems involving the "on-off" switches. As the precision of the filtering method depends uniquely on the division of the constraint region, its results are taken as benchmarks and a series of comparisons between the ADJ-CNOP and the GA-CNOP are performed. It is revealed that the GA-CNOP can always figure out the accurate lower bound of maximum predictable time even in discontinuous cases, while the ADJ-CNOP, owing to the effect of "on-off" switches, often yields the incorrect lower bound of maximum predictable time. This would suggest that in non-smooth cases, using a GA to solve the predictability problems is more effective than using the conventional optimization algorithm based on gradients, as long as the genetic operators are properly configured.

Zheng, Q.

2011-12-01

45

Combating the Small Sample Class Imbalance Problem Using Feature Selection  

Microsoft Academic Search

The class imbalance problem is encountered in real-world applications of machine learning and results in a classifier's suboptimal performance. Researchers have rigorously studied the resampling, algorithms, and feature selection approaches to this problem. No systematic studies have been conducted to understand how well these methods combat the class imbalance problem and which of these methods best manage the different challenges

Michael Wasikowski; Xue-wen Chen

2010-01-01

46

The Bernoulli Factory problem Reverse time martingale approach to sampling  

E-print Network

Factory - what is known? The Benoulli Factory problem let p (0, 1) be unknown given a black box Bernoulli Factory - what is known? The Benoulli Factory problem let p (0, 1) be unknown given a black box Bernoulli Factory - what is known? The Benoulli Factory problem let p (0, 1) be unknown given a black box

47

COMPARISON OF BIOLOGICAL COMMUNITIES: THE PROBLEM OF SAMPLE REPRESENTATIVENESS  

EPA Science Inventory

Obtaining an adequate, representative sample of biological communities or assemblages to make richness or compositional comparisons among sites is a continuing challenge. Traditionally, sample size is based on numbers of replicates or area collected or numbers of individuals enum...

48

COMPARISON OF ECOLOGICAL COMMUNITIES: THE PROBLEM OF SAMPLE REPRESENTATIVENESS  

EPA Science Inventory

Obtaining an adequate, representative sample of ecological communities to make taxon richness (TR) or compositional comparisons among sites is a continuing challenge. Sample representativeness literally means the similarity in species composition and relative abundance between a ...

49

The effect of unlabeled samples in reducing the small sample size problem and mitigating the Hughes phenomenon  

Microsoft Academic Search

The authors study the use of unlabeled samples in reducing the problem of small training sample size that can severely affect the recognition rate of classifiers when the dimensionality of the multispectral data is high. The authors show that by using additional unlabeled samples that are available at no extra cost, the performance may be improved, and therefore the Hughes

Behzad M. Shahshahani; David A. Landgrebe

1994-01-01

50

Behaviour Problems across Home and Kindergarten in an Australian Sample  

ERIC Educational Resources Information Center

The current study examined the extent to which kindergarten children display behaviour problems in the clinical range at both home and kindergarten. Differences and similarities between parents' and teachers' responses to misbehaviour were also assessed. The co-occurrence of problems at home and kindergarten was assessed using the Preschool and…

Herrera, Maite; Little, Emma

2005-01-01

51

SAMPLE SIZE PROBLEMS IN ANOVA: BAYESIAN POINT OF Anirban DasGupta  

E-print Network

SAMPLE SIZE PROBLEMS IN ANOVA: BAYESIAN POINT OF VIEW1 By Anirban DasGupta Purdue University and Brani Vidakovic Duke University In this paper we discuss the sample size problem for balanced one way of appropriate quadratic forms we derive explicit sample sizes for prespeci ed posterior precisions. Comparisons

West, Mike

52

SAMPLE SIZE PROBLEMS IN ANOVA: BAYESIAN POINT OF Anirban DasGupta  

E-print Network

SAMPLE SIZE PROBLEMS IN ANOVA: BAYESIAN POINT OF VIEW 1 By Anirban DasGupta Purdue University and Brani Vidakovic Duke University In this paper we discuss the sample size problem for balanced one way of appropriate quadratic forms we derive explicit sample sizes for prespecified posterior precisions. Comparisons

West, Mike

53

Relational Discriminant Analysis and Its Large Sample Size Problem Robert P.W. Duin  

E-print Network

Relational Discriminant Analysis and Its Large Sample Size Problem Robert P.W. Duin Pattern. This technique has a large sample size problem as the size of the similarity matrix equals the square suffers from a feature size - sample size dilemma. Better, more complete object representations, yield

Duin, Robert P.W.

54

On optimality and duality for multiobjective programming problems involving generalized d-type-I and related n-set functions  

Microsoft Academic Search

In this paper we establish some optimality and duality results under generalized convexity assumptions for a multiobjective programming problem involving generalized d-type-I and related n-set functions.

Vasile Preda; I. M. Stancu-Minasian; Eduard Koller

2003-01-01

55

Combating the Class Imbalance Problem in Small Sample Data Sets  

E-print Network

rigorously studied resampling methods, new algorithms, and feature selection methods, but no studies have been conducted to understand how well these methods combat the class imbalance problem. In particular, feature selection has been rarely studied outside...

Wasikowski, Michael

2009-07-07

56

NASTRAN thermal analyzer: Theory and application including a guide to modeling engineering problems, volume 2. [sample problem library guide  

NASA Technical Reports Server (NTRS)

A sample problem library containing 20 problems covering most facets of Nastran Thermal Analyzer modeling is presented. Areas discussed include radiative interchange, arbitrary nonlinear loads, transient temperature and steady-state structural plots, temperature-dependent conductivities, simulated multi-layer insulation, and constraint techniques. The use of the major control options and important DMAP alters is demonstrated.

Jackson, C. E., Jr.

1977-01-01

57

An empirical coverage test for the g-sample problem  

USGS Publications Warehouse

A nonparametric g-sample empirical coverage test has recently been developed for univariate continuous data. It is based upon the empirical coverages which are spacings of multiple random samples. The test is capable of detecting any distributional differences which may exist among the parent populations, without additional assumptions beyond randomness and continuity. The test can be effective with the limited and/or unequal sample sizes most often encountered in geologic studies. A computer program for implementing this procedure, G-SECT 1, is available. ?? 1991 International Association for Mathematical Geology.

Orlowski, L.A.; Grundy, W.D.; Mielke, P.W., Jr.

1991-01-01

58

Alcohol-Focused Spouse Involvement and Behavioral Couples Therapy: Evaluation of Enhancements to Drinking Reduction Treatment for Male Problem Drinkers  

ERIC Educational Resources Information Center

This study evaluated the effects of alcohol-focused spouse involvement and behavioral couples therapy (BCT) in group drinking reduction treatment for male problem drinkers. Sixty-four male clients and their female partners were randomly assigned to 1 of 3 conditions: treatment for problem drinkers only (PDO), couples alcohol-focused treatment, or…

Walitzer, Kimberly S.; Dermen, Kurt H.

2004-01-01

59

Direct sampling of multiple single-molecular rupture dominant pathways involving a multistep transition.  

PubMed

We report a novel single-molecular rupture mechanism revealed by direct sampling of the dominant pathway using a self-optimized path sampling method. Multiple dominant pathways involving multistep transitions are identified. The rupture may take place via a direct unfolding from the native state to the unfolding state, or through a two-step pathway bypassing a distinct intermediate metastable state (IMS). This scenario facilitates us to propose a three-state kinetic model, which can produce a nonlinear dependence of the rupture time on pulling forces similar to the ones reported in the literature. In particular, molecule conformations in the IMS maintain an elongation of the tail at one terminal, by which external pulling will enhance the relative stability of IMS. Consequently, even though the overall transition rate of the multistep pathway is relatively small, the molecule still has to be ruptured via the multistep pathway rather than the direct pathway. Thus, our work demonstrates an IMS trapping effect induced rupture mechanism involving an abnormal switching from a fast dominant pathway to a slow one. PMID:25347216

Jiang, Huijun; Ding, Huai; Hou, Zhonghuai

2014-12-14

60

Communication Problems in Turner Syndrome: A Sample Survey.  

ERIC Educational Resources Information Center

A survey of 128 females (ages 2-58) with Turner syndrome found almost one quarter were receiving or had received treatment for stuttering, articulation problems, and/or delayed language development, with the latter two disorders being checked most frequently. Only 4 or the 68 individuals receiving growth hormone treatment reported voice changes.…

Van Borsel, John; Dhooge, Inge; Verhoye, Kristof; Derde, Kristel; Curfs, Leopold

1999-01-01

61

A new LDA-based face recognition system which can solve the small sample size problem  

Microsoft Academic Search

A new LDA-based face recognition system is presented in this paper. Linear discriminant analysis (LDA) is one of the most popular linear projection techniques for feature extraction. The major drawback of applying LDA is that it may encounter the small sample size problem. In this paper, we propose a new LDA-based technique which can solve the small sample size problem.

Li-fen Chen; Hong-yuan Mark Liao; Ming-tat Ko; Ja-chen Lin; Gwo-jong Yu

2000-01-01

62

Propionibacterium acnes populations involved in deep pathological samples and their dynamics along the cardiac surgical pathway.  

PubMed

Propionibacterium acnes belongs to the normal skin microbiota, but it is also responsible for acne vulgaris and causes serious infections such as endocarditis and surgical site infections (SSI). The P. acnes population is structured into phylogenetic groups, with phylotype I being associated with acne. Herein, we explore the link between phylotypes and clinical origins in a collection of P. acnes isolated from different body sites, involved in deep infections or healthcare-associated infections (HAI), with particular emphasis on strains from cardiac SSI. Cardiac SSI have been further studied in terms of P. acnes population dynamics during the care pathway. The recA and tly genes phylotypes were compared to hemolytic behavior, susceptibility to antimicrobial agents, and clinical origins. An original approach of recA polymerase chain reaction temporal temperature gel electrophoresis (PCR-TTGE) was developed and applied for the direct identification of P. acnes phylotypes in surgical samples, in order to assess their temporal dynamics during the surgical course. Our results underlined the preferential involvement of IA-2/IB and II phylogroups in HAI and SSI. Unlike IA and II, type IA-2/IB presented a gradual increase with the depth of sampling in the peroperative phase of cardiac surgery. Phylotypes IA and IA-2/IB were both predominant in scar tissues and on postoperative skin, suggesting a specific predisposition to recolonize skin. Particular association of the phylotype IA-2/IB with SSI and its propensity to colonize wounds in cardiac surgery was observed. We assumed that the follow-up of P. acnes phylotypes during pathological processes could give new clues for P. acnes pathogenicity. PMID:25169966

Romano-Bertrand, S; Beretta, M; Jean-Pierre, H; Frapier, J-M; Calvet, B; Parer, S; Jumas-Bilak, E

2015-02-01

63

Quality Control and Flux Sampling Problems for Tower and Aircraft Data  

Microsoft Academic Search

A series of automated tests is developed for tower and aircraft time series to identify instrumentation problems, flux sampling problems, and physically plausible but unusual situations. The automated procedures serve as a safety net for quality controlling data. A number of special flags are developed representing a variety of potential problems such as inconsistencies between different tower levels and the

Dean Vickers; L. Mahrt

1997-01-01

64

Factors related to sexual abuse and forced sex in a sample of women experiencing police-involved intimate partner violence.  

PubMed

Intimate partner sexual violence (IPSV) is a significant social problem, particularly among women who are concurrently experiencing physical violence in their intimate relationships. This research examined the prevalence and factors associated with IPSV among a sample of women recruited at the scene of police-involved intimate partner violence incidents (N = 432). Within this sample, 43.98 percent of participants reported experiencing IPSV; this includes 17.36 percent who reported sexual abuse and 26.62 percent who reported forced sex. Multinomial logistic regression was used to examine the factors related to sexual abuse and forced sex, controlling for victim and relationship characteristics. Compared with women not reporting IPSV, women who were sexually abused or forced into sexual intercourse were significantly more likely to experience strangulation, feelings of shame, and posttraumatic stress disorder symptoms. Women whose partners had forced sex were more likely to report that they had a child in common with their abusive partner; and that their partner was sexually jealous, had threatened to kill them, had stalked or harassed them, or caused them to have a miscarriage due to abuse. These findings can be used to better inform social work practitioners about the prevalence and nature of IPSV and the associated risk factors, and can assist in routine screening and intervention. PMID:25095631

Messing, Jill Theresa; Thaller, Jonel; Bagwell, Meredith

2014-08-01

65

Seated anthropometry: the problems involved in a large scale survey of disabled and elderly people  

Microsoft Academic Search

This paper draws attention to a number of problems in the collection of anthropometric data for the design of easy chairs for disabled and elderly people. The solution of these problems is important if valid and reliable data on human body sizes are to be obtained from the elderly and disabled populations. These problems include gaining access to representative subjects

1981-01-01

66

An Exploration of Family Problem-Solving and Affective Involvement as Moderators Between Disease Severity and Depressive Symptoms in Adolescents with Inflammatory Bowel Disease  

PubMed Central

Little is known about how family functioning relates to psychosocial functioning of youth with inflammatory bowel disease (IBD). The study aim was to examine family problem solving and affective involvement as moderators between adolescent disease severity and depressive symptoms. Participants were 122 adolescents with IBD and their parents. Measures included self-reported and parent-reported adolescent depressive symptoms, parent-reported family functioning, and physician-completed measures of disease severity. Disease severity was a significant predictor of adolescent-reported depressive symptoms, but not parent-reported adolescent depressive symptoms. Family affective involvement significantly predicted parent-reported adolescent depressive symptoms, while family problem-solving significantly predicted adolescent self-report of depressive symptoms. Neither affective involvement nor problem-solving served as moderators. Family affective involvement may play an important role in adolescent emotional functioning but may not moderate the effect of disease severity on depressive symptoms. Research should continue to examine effects of family functioning on youth emotional functioning and include a sample with a wider range of disease severity to determine if interventions aimed to enhance family functioning are warranted. PMID:23793840

Schuman, Shana L.; Graef, Danielle M.; Janicke, David M.; Gray, Wendy N.; Hommel, Kevin A.

2014-01-01

67

Serial Computations of Levenshtein In the previous chapters, we discussed problems involving an exact match  

E-print Network

4 Serial Computations of Levenshtein Distances In the previous chapters, we discussed problems commonsubsequence, which is expressively equivalent to the simple form of the Levenshtein distance. 4.1 Levenshtein distance and the LCS problem The Levenshtein distance is a metric that measures the similarity of two

Hirschberg, Dan

68

Judicial decisions on cases involving problem gambling and crime in England and Wales  

Microsoft Academic Search

Previous research indicates that problem gambling is often associated with crime. Most of this research is focussed on individual psychological cases or data sets examining the relationship between crime rates and location of gambling venues. There is little international research on the response of criminal courts in recognising and accepting problem gambling as a reason for committing crime. This paper

Graham Brooks; Alex Blaszczynski

2011-01-01

69

Prosocial Involvement and Antisocial Peer Affiliations as Predictors of Behavior Problems in Urban Adolescents: Main Effects and Moderating Effects  

ERIC Educational Resources Information Center

This study examined the relationships between prosocial involvement (PI), antisocial peer affiliations (APA), and the degree of their overlapping or independent prediction of behavior problems in urban adolescents. Two dimensions of behavior were assessed at ages 9-11 and at ages 13-15: disruptive, aggressive conduct and number of delinquent…

Kaufmann, Dagmar R.; Wyman, Peter A.; Forbes-Jones, Emma L.; Barry, Jason

2007-01-01

70

TOPAZ - the transient one-dimensional pipe flow analyzer: code validation and sample problems  

SciTech Connect

TOPAZ is a ''user friendly'' computer code for modeling the one-dimensional-transient physics of multi-species gas transfer in arbitrary arrangements of pipes, valves, vessels, and flow branches. This document presents a series of sample problems designed to aid potential users in creating TOPAZ input files. To the extent possible, sample problems were selected for which analytical solutions currently exist. TOPAZ comparisons with such solutions are intended to provide a measure of code validation.

Winters, W.S.

1985-10-01

71

TOPAZ - the transient one-dimensional pipe flow analyzer: code validation and sample problems  

Microsoft Academic Search

TOPAZ is a ''user friendly'' computer code for modeling the one-dimensional-transient physics of multi-species gas transfer in arbitrary arrangements of pipes, valves, vessels, and flow branches. This document presents a series of sample problems designed to aid potential users in creating TOPAZ input files. To the extent possible, sample problems were selected for which analytical solutions currently exist. TOPAZ comparisons

Winters

1985-01-01

72

Problem Gambling and the Youth-to-Adulthood Transition: Assessing Problem Gambling Severity Trajectories in a Sample of Young Adults.  

PubMed

In this study, using four wave longitudinal data, we examined problem gambling severity trajectories in a sample of young adults. Using latent growth curve modeling, we examined how initial level of problem gambling severity and the rate of change were affected by 11 time-invariant predictors: gender, age of onset of gambling, experiencing a big win early in gambling career, experiencing a big loss early in gambling career, alcohol dependence, drug dependence, anxiety, depression, perceived social support, illusion of control, and impulsiveness. Five of the eleven predictors affected initial levels of problem gambling severity; however only impulsiveness affected the rate of change across time. The mean trajectory was negative (lessening of problem gambling risk severity across time), but there was significant inter-individual variation in trajectories and initial levels of problem gambling severity. The main finding of problem gambling risk diminishing over time challenges the conventional picture of problem gambling as an inevitable "downward spiral," at least among young adults, and suggests that targeted prevention campaigns may be a cost-effective alternative for reaching treatment resistant youth. PMID:25260900

Edgerton, Jason D; Melnyk, Timothy S; Roberts, Lance W

2014-09-27

73

Problems Involved in the Choice and Use of Materials in Airplane Construction  

NASA Technical Reports Server (NTRS)

The present state of the problem of materials in airplane construction is studied on the basis of data giving the principal characteristics of different materials and showing how they affect the form of airplane parts.

Brenner, Paul

1932-01-01

74

The Prevalence and Incremental Validity of Identity Problem Symptoms in a High School Sample  

ERIC Educational Resources Information Center

This paper examines the expression, prevalence, and incremental validity of identity problem symptoms in adolescence. A sample of high school students (N = 140) aged 15-18 completed measures of identity problem symptoms, identity status, and psychological symptom severity. Findings suggested that 14.3% would meet DSM IV criteria for identity…

Berman, Steven L.; Weems, Carl F.; Petkus, Veronica F.

2009-01-01

75

A Model for Predicting Behavioural Sleep Problems in a Random Sample of Australian Pre-Schoolers  

ERIC Educational Resources Information Center

Behavioural sleep problems (childhood insomnias) can cause distress for both parents and children. This paper reports a model describing predictors of high sleep problem scores in a representative population-based random sample survey of non-Aboriginal singleton children born in 1995 and 1996 (1085 girls and 1129 boys) in Western Australia.…

Hall, Wendy A.; Zubrick, Stephen R.; Silburn, Sven R.; Parsons, Deborah E.; Kurinczuk, Jennifer J.

2007-01-01

76

The k-Sample Problem When k is Large and n Small  

E-print Network

The k-sample problem, i.e., testing whether two or more data sets come from the same population, is a classic one in statistics. Instead of having a small number of k groups of samples, this dissertation works on a large number of p groups...

Zhan, Dongling

2012-07-16

77

Setting Structute, Involvement, and Developmental Status as Learner: Elements of the Problem of the Match.  

ERIC Educational Resources Information Center

In order to study the appropriateness of different structured classroom settings for children's learning and development, the Columbia Classroom has constructed IRIS (Involvement Ratings in Settings) and PRIN (the Pupil Role Interview). IRIS, a seven dimensional scale of affectivity by non-verbal indices, has been employed in two classrooms for…

Grannis, Joseph C.; And Others

78

Some Problems Involved in the Shared Cataloging Subsystem of the Ohio College Library Center.  

ERIC Educational Resources Information Center

This report outlines the development of the Ohio College Library Center (OCLC) and considers some basic problems in OCLC shared cataloging--e.g., the uneven quality of input cataloging and increasing number of duplicate records. Summaries of findings from an OCLC evaluative study and two surveys of shared cataloging are presented. The report…

Sacco, Margaret T.

79

Interval-valued optimization problems involving (?, ?)-right upper-Dini-derivative functions.  

PubMed

We consider an interval-valued multiobjective problem. Some necessary and sufficient optimality conditions for weak efficient solutions are established under new generalized convexities with the tool-right upper-Dini-derivative, which is an extension of directional derivative. Also some duality results are proved for Wolfe and Mond-Weir duals. PMID:24982989

Preda, Vasile

2014-01-01

80

Interval-Valued Optimization Problems Involving (?, ?)-Right Upper-Dini-Derivative Functions  

PubMed Central

We consider an interval-valued multiobjective problem. Some necessary and sufficient optimality conditions for weak efficient solutions are established under new generalized convexities with the tool-right upper-Dini-derivative, which is an extension of directional derivative. Also some duality results are proved for Wolfe and Mond-Weir duals. PMID:24982989

2014-01-01

81

Abstract--This paper addresses the problem of controlling wind energy conversion systems (WECS) which involve  

E-print Network

Abstract-- This paper addresses the problem of controlling wind energy conversion systems (WECS-inverter. The goal of control is to maximize wind energy extraction and this needs letting the wind turbine rotor wind energy extraction) only for one wind speed value depending on the considered value of turbine

Paris-Sud XI, Université de

82

Longitudinal Associations of Alcohol Involvement with Subjective Well-Being in Adolescence and Prediction to Alcohol Problems in Early Adulthood  

Microsoft Academic Search

Adolescent alcohol involvement is associated with numerous negative outcomes, but also appears to have positive correlates,\\u000a including subjective well-being. Additional research is needed to understand these paradoxical findings. The current study\\u000a examines alcohol use, adverse alcohol-related (and other substance-related) consequences, and subjective well being in adolescence,\\u000a and prediction to problem alcohol use in early adulthood. Participants in this longitudinal study,

W. Alex MasonRichard; Richard L. Spoth

83

Long term GP opinions and involvement after a consultation-liaison intervention for mental health problems  

PubMed Central

Background Shared Mental Health care between Psychiatry and Primary care has been developed to improve the care of common mental health problems but has not hitherto been adequately evaluated. The present study evaluated a consultation-liaison intervention with two objectives: to explore long-term GP opinions (relating to impact on their management and on patient medical outcome) and to determine the secondary referral rate, after a sufficient time lapse following the intervention to reflect a "real-world" primary care setting. Methods All the 139 collaborating GPs (response rate: 84.9%) were invited two years after the intervention to complete a retrospective telephone survey for each patient (181 patients; response rate: 69.6%). Results 91.2% of GPs evaluated effects as positive for primary care management (mainly as support) and 58.9% noted positive effects for patient medical outcome. Two years post-intervention, management was shared care for 79.7% of patients (the GP as the psychiatric care provider) and care by a psychiatrist for 20.3% patients. Secondary referral occurred finally in 44.2% of cases. Conclusion The intervention supported GP partners in their management of patients with common mental health problems. Further studies are required on the appropriateness of the care provider. PMID:18597695

Younès, Nadia; Passerieux, Christine; Hardy-Bayle, Marie-Christine; Falissard, Bruno; Gasquet, Isabelle

2008-01-01

84

Helmholtz Fermi surface harmonics: an efficient approach for treating anisotropic problems involving Fermi surface integrals  

NASA Astrophysics Data System (ADS)

We present a new efficient numerical approach for representing anisotropic physical quantities and/or matrix elements defined on the Fermi surface (FS) of metallic materials. The method introduces a set of numerically calculated generalized orthonormal functions which are the solutions of the Helmholtz equation defined on the FS. Noteworthy, many properties of our proposed basis set are also shared by the FS harmonics introduced by Philip B Allen (1976 Phys. Rev. B 13 1416), proposed to be constructed as polynomials of the cartesian components of the electronic velocity. The main motivation of both approaches is identical, to handle anisotropic problems efficiently. However, in our approach the basis set is defined as the eigenfunctions of a differential operator and several desirable properties are introduced by construction. The method is demonstrated to be very robust in handling problems with any crystal structure or topology of the FS, and the periodicity of the reciprocal space is treated as a boundary condition for our Helmholtz equation. We illustrate the method by analysing the free-electron-like lithium (Li), sodium (Na), copper (Cu), lead (Pb), tungsten (W) and magnesium diboride (MgB_{2}).

Eiguren, Asier; Gurtubay, Idoia G.

2014-06-01

85

Gambling problems in the family – A stratified probability sample study of prevalence and reported consequences  

Microsoft Academic Search

BACKGROUND: Prior studies on the impact of problem gambling in the family mainly include help-seeking populations with small numbers of participants. The objective of the present stratified probability sample study was to explore the epidemiology of problem gambling in the family in the general population. METHODS: Men and women 16–74 years-old randomly selected from the Norwegian national population database received

Hanne Gro Wenzel; Anita Øren; Inger Johanne Bakken

2008-01-01

86

Efficient Gaussian Sampling for Solving Large-Scale Inverse Problems Using MCMC  

NASA Astrophysics Data System (ADS)

The resolution of many large-scale inverse problems using MCMC methods requires a step of drawing samples from a high dimensional Gaussian distribution. While direct Gaussian sampling techniques, such as those based on Cholesky factorization, induce an excessive numerical complexity and memory requirement, sequential coordinate sampling methods present a low rate of convergence. Based on the reversible jump Markov chain framework, this paper proposes an efficient Gaussian sampling algorithm having a reduced computation cost and memory usage. The main feature of the algorithm is to perform an approximate resolution of a linear system with a truncation level adjusted using a self-tuning adaptive scheme allowing to achieve the minimal computation cost. The connection between this algorithm and some existing strategies is discussed and its efficiency is illustrated on a linear inverse problem of image resolution enhancement.

Gilavert, Clement; Moussaoui, Said; Idier, Jerome

2015-01-01

87

NRES 725 Plant Physiological Ecology Spring 2011 Leaf Energy Balance --Sample Problem Set  

E-print Network

= 714 W m-2 ) 1.b) How much of this radiant energy would be absorbed by the leaf? (1592 W m-2 ) 1.cNRES 725 Plant Physiological Ecology Spring 2011 1 Leaf Energy Balance -- Sample Problem Set 1 handout (HO #1); what equation and concept goes with each of the arrows. 2) Leaves absorb and lose energy

Nowak, Robert S.

88

Factors, Correlates, Problem Areas Affecting Career Decision Making of a Cross-Sectional Sample of Students.  

ERIC Educational Resources Information Center

A study was conducted to investigate the effects of the correlates and problem areas affecting career decision making and specifically to test the validity of the O'Neil, Meeker & Borgers' (1978) model. A cross-sectional sample of high school, undergraduate, and graduate students (N=1,436) responded to the Career Factor Checklist (CFC) and…

O'Neil, James M.; And Others

89

An algorithm for the weighting matrices in the sampled-data optimal linear regulator problem  

NASA Technical Reports Server (NTRS)

The sampled-data optimal linear regulator problem provides a means whereby a control designer can use an understanding of continuous optimal regulator design to produce a digital state variable feedback control law which satisfies continuous system performance specifications. A basic difficulty in applying the sampled-data regulator theory is the requirement that certain digital performance index weighting matrices, expressed as complicated functions of system matrices, be computed. Infinite series representations are presented for the weighting matrices of the time-invariant version of the optimal linear sampled-data regulator problem. Error bounds are given for estimating the effect of truncating the series expressions after a finite number of terms, and a method is described for their computer implementation. A numerical example is given to illustrate the results.

Armstrong, E. S.; Caglayan, A. K.

1976-01-01

90

Heritability of Problem Drinking and the Genetic Overlap with Personality in a General Population Sample  

PubMed Central

This study examined the heritability of problem drinking and investigated the phenotypic and genetic relationships between problem drinking and personality. In a sample of 5,870 twins and siblings and 4,420 additional family members from the Netherlands Twin Register. Data on problem drinking (assessed with the AUDIT and CAGE; 12 items) and personality [NEO Five-Factor Inventory (FFI); 60 items] were collected in 2009/2010 by surveys. Confirmatory factor analysis on the AUDIT and CAGE items showed that the items clustered on two separate but highly correlated (r?=?0.74) underlying factors. A higher-order factor was extracted that reflected those aspects of problem drinking that are common to the AUDIT and CAGE, which showed a heritability of 40%. The correlations between problem drinking and the five dimensions of personality were small but significant, ranging from 0.06 for Extraversion to ?0.12 for Conscientiousness. All personality dimensions (with broad-sense heritabilities between 32 and 55%, and some evidence for non-additive genetic influences) were genetically correlated with problem drinking. The genetic correlations were small to modest (between |0.12| and |0.41|). Future studies with longitudinal data and DNA polymorphisms are needed to determine the biological mechanisms that underlie the genetic link between problem drinking and personality. PMID:22303371

de Moor, Marleen H. M.; Vink, Jacqueline M.; van Beek, Jenny H. D. A.; Geels, Lot M.; Bartels, Meike; de Geus, Eco J. C.; Willemsen, Gonneke; Boomsma, Dorret I.

2011-01-01

91

Profiles of Systems Involvement in a Sample of High-Risk Urban Adolescents with Unmet Treatment Needs  

PubMed Central

This study examined profiles of involvement in four systems (education, child welfare, legal, and treatment) in a sample of 253 high-risk urban adolescents with unmet behavioral health needs. Self-report data were collected on multiple dimensions of involvement within each system, demographics, and DSM-IV diagnoses. Latent class analysis revealed four profiles: Education System: Academic and Disciplinary, Education System: Academic Only, Legal/Juvenile Justice Involved, and Multiple Systems/Child Welfare. Profiles differed based on gender and psychiatric diagnoses. Boys were overrepresented in Education System: Academic and Disciplinary and Legal/Juvenile Justice Involved, and girls were overrepresented in Multiple Systems/Child Welfare. The two education system focused classes were characterized by depressive disorders and ADHD. Youth in Legal/Juvenile Justice Involved and Multiple Systems/Child Welfare were characterized by conduct disorder and substance abuse. Implications for assessment and treatment planning for high-risk youth and for the organization of community-based behavioral health services are discussed. PMID:21927525

Dauber, Sarah; Hogue, Aaron

2011-01-01

92

Longitudinal Associations of Alcohol Involvement with Subjective Well-Being in Adolescence and Prediction to Alcohol Problems in Early Adulthood  

PubMed Central

Adolescent alcohol involvement is associated with numerous negative outcomes, but also appears to have positive correlates, including subjective well-being. Additional research is needed to understand these paradoxical findings. The current study examines alcohol use, adverse alcohol-related (and other substance-related) consequences, and subjective well being in adolescence, and prediction to problem alcohol use in early adulthood. Participants in this longitudinal study, which extended from age 11 to age 21, were 208 rural teens (109 girls) and their families. Covariates included early substance use, early conduct problems, early depressed mood, gender, and parent educational attainment. Structural equation modeling showed that subjective well-being at age 16 positively predicted increased alcohol use at age 18. Alcohol use was not a significant predictor of subjective well-being; however, alcohol use at age 18 positively predicted alcohol problems at age 21, even while controlling for earlier adverse consequences and other predictors. Results help to further elucidate both the negative and positive correlates of underage drinking, and support the value of delaying alcohol initiation. PMID:21286934

Mason, W. Alex; Spoth, Richard L.

2013-01-01

93

Longitudinal associations of alcohol involvement with subjective well-being in adolescence and prediction to alcohol problems in early adulthood.  

PubMed

Adolescent alcohol involvement is associated with numerous negative outcomes, but also appears to have positive correlates, including subjective well-being. Additional research is needed to understand these paradoxical findings. The current study examines alcohol use, adverse alcohol-related (and other substance-related) consequences, and subjective well being in adolescence, and prediction to problem alcohol use in early adulthood. Participants in this longitudinal study, which extended from age 11 to age 21, were 208 rural teens (109 girls) and their families. Covariates included early substance use, early conduct problems, early depressed mood, gender, and parent educational attainment. Structural equation modeling showed that subjective well-being at age 16 positively predicted increased alcohol use at age 18. Alcohol use was not a significant predictor of subjective well-being; however, alcohol use at age 18 positively predicted alcohol problems at age 21, even while controlling for earlier adverse consequences and other predictors. Results help to further elucidate both the negative and positive correlates of underage drinking, and support the value of delaying alcohol initiation. PMID:21286934

Mason, W Alex; Spoth, Richard L

2011-09-01

94

Sample treatment methods involving combinatorial peptide ligand libraries for improved proteomes analyses.  

PubMed

If used in an optimized manner, the technology of combinatorial peptide solid-phase libraries can easily improve the analytical determinations of proteomes by several factors. The discovery of novel species and of early stage biomarkers becomes thus reachable with a simple sample treatment. This report describes the most important point to consider (overloading and full recovery) along with a minimum scientific background and gives then detailed recipes to laboratory technicians. Orientations for optional routes are also given according to the objective of the experimental investigations. This covers different approaches to capture proteins of very low abundance. Total protein harvestings to prevent partial losses are also described such as single exhaustive desorption and fractionated elutions for more detailed analyses. Documented results are also reported demonstrating the capability of the technology well beyond what is the common assumption. PMID:25384740

Righetti, Pier Giorgio; Boschetti, Egisto

2015-01-01

95

An experience sampling study of PTSD and alcohol-related problems.  

PubMed

Posttraumatic stress disorder (PTSD) represents a debilitating psychiatric condition that is affecting the lives of many returning veterans. PTSD and alcohol use and dependence are highly comorbid. The purpose of this study was to understand the functional mechanisms between PTSD and alcohol use and problems. Specifically, the role of negative urgency and emotional intelligence were investigated as vulnerability and resiliency factors, respectively. This study utilized experience sampling to test associations between PTSD symptoms and alcohol use and related problems in a sample of 90 OIF/OEF veterans. Participants completed 8 brief questionnaires daily for 2 weeks on palmtop computers. Elevations in PTSD symptoms during the day were associated with subsequent increases in alcohol use and associated problems that night. PTSD symptoms were associated with greater problems above and beyond the effect of drinking level at both the within- and between- person level. Emotional intelligence was associated with lower negative urgency, fewer PTSD symptoms, and less alcohol use and associated problems. The effects of emotional intelligence were primarily indirect via negative urgency and the effects of negative urgency on alcohol use and problems were indirect via its positive association with PTSD symptoms. Hypothesized cross-level effects of emotional intelligence and negative urgency were not supported. The findings suggest a functional association between PTSD symptoms and alcohol consumption. The association between PTSD symptoms and alcohol consumption is consistent with a self-medication model. However, the significant associations between PTSD symptoms and alcohol problems, after controlling for use level, suggest a broader role of dysregulation. PMID:25134021

Gaher, Raluca M; Simons, Jeffrey S; Hahn, Austin M; Hofman, Nicole L; Hansen, Jamie; Buchkoski, Jerome

2014-12-01

96

Adolescent criminal justice involvement and adulthood sexually transmitted infection in a nationally representative US sample.  

PubMed

Criminal justice involvement (CJI) disrupts social and sexual networks, and sexually transmitted infections (STIs) thrive on network disruption. Adolescent CJI may be a particularly important determinant of STI because experiences during adolescence influence risk trajectories into adulthood. We used Wave III (2001-2002: young adulthood) of the National Longitudinal Study of Adolescent Health (N?=?14,322) to estimate associations between history of adolescent (younger than 18 years) CJI and adult STI risk. Respondents who reported a history of repeat arrest in adolescence, adolescent conviction, and arrest both as an adolescent and an adult (persistent arrest) had between two to seven times the odds of STI (biologically confirmed infection with chlamydia, gonorrhea, or trichomoniasis) in adulthood and between two to three times the odds of multiple partnerships and inconsistent condom use in the past year in adulthood. In analyses adjusting for sociodemographic and behavioral factors, history of having six or more adolescent arrests was associated with more than five times the odds of STI (adjusted odds ratio (AOR) 5.44, 95 % confidence interval (CI) 1.74-17.1). Both adolescent conviction and persistent CJI appeared to remain independent correlates of STI (conviction: AOR 1.90, 95 % CI 1.02-3.55; persistent CJI: AOR 1.60, 95 % CI 0.99-2.57). Adolescents who have repeat arrests, juvenile convictions, and persist as offenders into adulthood constitute priority populations for STI treatment and prevention. The disruptive effect of adolescent CJI may contribute to a trajectory associated with STI in adulthood. PMID:22815054

Khan, Maria R; Rosen, David L; Epperson, Matthew W; Goldweber, Asha; Hemberg, Jordana L; Richardson, Joseph; Dyer, Typhanye Penniman

2013-08-01

97

Sampling  

NSDL National Science Digital Library

This webpage contains three activities that have students work through problems associated with sampling. Each activity includes a brief description, materials list, and a set of lesson worksheets. The last activity on the page, the "Cereal Toy Investigation" also includes an online simulator in the form of a Java applet.

Kawas, Terry

2012-01-01

98

Geometric structure in seismic data, sampling and computational inverse problems (Invited)  

NASA Astrophysics Data System (ADS)

In (nonlinear) seismic inverse problems one requires data from available large arrays acquired for many events. These data, naturally, contain information about Earth's interior over a large range of scales. From the viewpoint of detecting broadband wavefields, however, sampling often remains a challenge. We discuss various concepts and techniques which aid in analyzing and partitioning (or decomposing) such data, including compression with a novel, multi-scale, frame of Gaussian wavepackets, graph cuts and (extended) structure tensors. We emphasize the underlying geometric structure both in the physical embedding and in the associated space where the data find a natural representation. We consider several dimensionality reduction approaches including manifold learning, and develop possible notions of distance. These enable the development of methods of comparing data, for example, within and between arrays, and comparing observed with simulated data for inverse problems and regularization. Within the context of inverse problems we briefly mention the synthesis of the Dirichlet-to-Neumann map from the data, randomized sampling and direct structured solvers of the direct problem using hierarchically semi-separable (HSS) matrices in a multi-frequency formulation enabling an efficient workflow with a large number of events.

De Hoop, M. V.; Andersson, F.; Tricoche, X.; Xia, J.; Yeh, R.

2013-12-01

99

Psychiatric symptoms and substance use disorders in a nationally representative sample of American adolescents involved with foster care  

PubMed Central

Objective To ascertain the prevalence of psychiatric symptoms and substance use disorders among adolescents with a lifetime history of foster care placement, using data from a nationally representative sample of US adolescents. Methods We studied adolescents aged 12–17 in the public use file of the 2000 National Household on Drug Abuse (N = 19,430, including 464 adolescents with history of foster care placement). Psychiatric symptoms and substance use disorders were ascertained through direct interviewing of adolescents. Logistic regression analyses were used to estimate the odds of past-year psychiatric symptoms and substance use disorders among adolescents involved with foster care, as compared to those without a lifetime history of foster care placement (comparison group) Results Adolescents involved with foster care had more past-year psychiatric symptoms, and especially more conduct symptoms, and past-year substance use disorders than those never placed in foster care. Adolescents involved with foster care were about four times more likely to have attempted suicide in the preceding 12 months (AOR, 3.95; 95% CI 2.78, 5.61), and about five times more likely to receive a drug dependence diagnosis in the same period (AOR, 4.81; 95% CI, 3.22, 7.18). Conclusions Adolescents involved with foster care have a higher prevalence of psychiatric symptoms and drug use disorders than those never placed in foster care. Additionally, the results of this study suggest that they may be at elevated risk for suicide attempts PMID:16549295

Pilowsky, Daniel J; Wu, Li-Tzy

2006-01-01

100

Health problems of women employed in jobs involving psychological and ergonomic stressors: the case of garment workers in Québec.  

PubMed

Health problems of women whose jobs involved intense time pressure were evaluated in a study of 800 sewing-machine operators employed in Québec between 1976 and 1985. Information on workers' occupational characteristics were obtained from public records. Symptoms of anxiety and depression, use of medication and disability status were determined by interview. Garment workers had an increased prevalence of slight, moderate and severe disability and higher levels of symptoms of anxiety and depression when compared to workers in other occupations. Garment workers paid piecework rates took medication for stomach problems in greater proportion than workers paid an hourly wage. Furthermore, workers who spend 5-9, 10-14, 15-19 and 20 or more years in piecework had an increased prevalence of severe disability compared to the baseline category 0-4 years, with adjusted risk ratios of 2.2 (95% CI = 1.14-4.6), 3.3 (95% CI = 1.5-6.9), 3.6 (95% CI = 1.5-8.4 and 2.3 (95% CI = 0.8-6.6) respectively, independent of age, smoking habits, education, type of task and total length of employment. These findings suggest that short-term, non-disabling conditions associated with time pressure by previous authors may have more important long-term sequelae then had been previously documented. PMID:1615690

Brisson, C; Vézina, M; Vinet, A

1992-01-01

101

Quantification and molecular characterization of Salmonella isolated from food samples involved in salmonellosis outbreaks in Rio Grande do Sul, Brazil  

PubMed Central

Data concerning the prevalence and populations of Salmonella in foods implicated in outbreaks may be important to the development of quantitative microbial risk assessments of individual food products. In this sense, the objective of the present study was to assess the amount of Salmonella sp. in different foods implicated in foodborne outbreaks in Rio Grande do Sul occurred in 2005 and to characterize the isolated strains using phenotypic and genotypic methods. Nineteen food samples involved in ten foodborne outbreaks occurred in 2005, and positive on Salmonella isolation at the Central Laboratory of the Health Department of the State of Rio Grande do Sul, were included in this study. Food samples were submitted to estimation of Salmonella using the Most Probable Number (MPN) technique. Moreover, one confirmed Salmonella colony of each food sample was serotyped, characterized by its XbaI-macrorestriction profile, and submitted to antimicrobial resistance testing. Foods containing eggs, mayonnaise or chicken were contaminated with Salmonella in eight outbreaks. Higher counts (>107 MPN.g-1) of Salmonella were detected mostly in foods containing mayonnaise. The isolation of Salmonella from multiple food items in five outbreaks probably resulted from the cross-contamination, and the high Salmonella counts detected in almost all analyzed samples probably resulted from storing in inadequate temperature. All strains were identified as S. Enteritidis, and presented a unique macrorestriction profile, demonstrating the predominance of one clonal group in foods involved in the salmonellosis outbreaks. A low frequency of antimicrobial resistant S. Enteritidis strains was observed and nalidixic acid was the only resistance marker detected. PMID:24031261

Mürmann, Lisandra; dos Santos, Maria Cecília; Longaray, Solange Mendes; Both, Jane Mari Corrêa; Cardoso, Marisa

2008-01-01

102

Examining the Criterion Validity of CBCL and TRF Problem Scales and Items in a Large Singapore Sample  

ERIC Educational Resources Information Center

This study examined the criterion validity of the Child Behavior Checklist (CBCL) and Teacher's Report Form (TRF) problem scales and items in demographically-matched Singapore samples of referred and non-referred children (840 in each sample for the CBCL and 447 in each sample for the TRF). Internal consistency estimates for both the CBCL and TRF…

Ang, Rebecca P.; Rescorla, Leslie A.; Achenbach, Thomas M.; Ooi, Yoon Phaik; Fung, Daniel S. S.; Woo, Bernardine

2012-01-01

103

The inverse problem in magnetic force microscopy—inferring sample magnetization from MFM images  

NASA Astrophysics Data System (ADS)

Nanomagnetic structures have the potential to surpass silicon’s scaling limitations both as elements in hybrid CMOS logic and as novel computational elements. Magnetic force microscopy (MFM) offers a convenient characterization technique for use in the design of such nanomagnetic structures. MFM measures the magnetic field and not the sample’s magnetization. As such the question of the uniqueness of the relationship between an external magnetic field and a magnetization distribution is a relevant one. To study this problem we present a simple algorithm which searches for magnetization distributions consistent with an external magnetic field and solutions to the micromagnetic equations’ qualitative features. The algorithm is not computationally intensive and is found to be effective for our test cases. On the basis of our results we propose a systematic approach for interpreting MFM measurements.

Rawlings, Colin; Durkan, Colm

2013-08-01

104

Medical Problems in a Sample of Children with Intellectual Impairments in Jordan.  

ERIC Educational Resources Information Center

Medical problems of 262 children attending special schools for persons having intellectual impairments in Jordan were examined. The most common problems were neurological problems (affecting 38.55%), followed by dental disease, orthopedic problems, vision and eye problems, hearing/ear problems, urinary diseases, and heart problems. (JDD)

Yousef, Jamal M. S.

1993-01-01

105

Trans-dimensional Monte Carlo sampling applied to the magnetotelluric inverse problem  

NASA Astrophysics Data System (ADS)

The data required to build geological models of the subsurface are often unavailable from direct measurements or well logs. In order to image the subsurface geological structures several geophysical methods have been developed. The magnetotelluric (MT) method uses natural, time-varying electromagnetic (EM) fields as its source to measure the EM impedance of the subsurface. The interpretation of these data is routinely undertaken by solving inverse problems to produce 1D, 2D or 3D electrical conductivity models of the subsurface. In classical MT inverse problems the investigated models are parametrized using a fixed number of unknowns (i.e. fixed number of layers in a 1D model, or a fixed number of cells in a 2D model), and the non-uniqueness of the solution is handled by a regularization term added to the objective function. This study presents a different approach to the 1D MT inverse problem, by using a trans-dimensional Monte Carlo sampling algorithm, where trans-dimensionality implies that the number of unknown parameters is a parameter itself. This construction has been shown to have a built-in Occam razor, so that the regularization term is not required to produce a simple model. The influences of subjective choices in the interpretation process can therefore be sensibly reduced. The inverse problem is solved within a Bayesian framework, where posterior probability distribution of the investigated parameters are sought, rather than a single best-fit model, and uncertainties on the model parameters, and their correlation, can be easily measured.

Mandolesi, Eric; Piana Agostinetti, Nicola

2015-01-01

106

Physics 228 Lecture 18 Appendix B 1 Winter 2009 Lecture 18 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems using Laplace transforms (Chapter 8). §8.9: 12 conditions (here I will consistently use dots to signify time derivatives, unlike Boas) 2 , 0 1, 0 2.t t y

Ellis, Steve

107

Sustained impact of inattention and hyperactivity-impulsivity on peer problems: mediating roles of prosocial skills and conduct problems in a community sample of children.  

PubMed

This prospective 2-year longitudinal study tested whether inattentive and hyperactive/impulsive symptom dimensions predicted future peer problems, when accounting for concurrent conduct problems and prosocial skills. A community sample of 492 children (49 % female) who ranged in age from 6 to 10 years (M = 8.6, SD = .93) was recruited. Teacher reports of children's inattention, and hyperactivity/impulsivity symptoms, conduct problems, prosocial skills and peer problems were collected in two consecutive school years. Elevated inattention and hyperactivity/impulsivity in Year-1 predicted greater peer problems in Year-2. Conduct problems in the first and second years of the study were associated with more peer problems, and explained a portion of the relationship between inattention and hyperactivity/impulsivity with peer problems. However, prosocial skills were associated with fewer peer problems in children with elevated inattention and hyperactivity/impulsivity. Inattention and hyperactivity/impulsivity have negative effects on children's peer functioning after 1-year, but concurrent conduct problems and prosocial skills have important and opposing impacts on these associations. PMID:24013840

Andrade, Brendan F; Tannock, Rosemary

2014-06-01

108

A lunar-based analytical laboratory and contamination problems in analysis of Moon and Mars samples  

NASA Astrophysics Data System (ADS)

A summary follows of our experiences and techniques used in the analysis of samples from Apollo Missions 11 to 17. The studies were conducted at the Ames Research Center, Moffett Field, CA, the University of Missouri, Columbia, MO, and the University of Maryland, College Park, MD, 1969 - 1974. Our search was directed to water-extractable compounds with emphasis on amino acids. Gas chromatography, ion-exchange chromatography and gas chromatography combined with mass spectrometry were used for the analysis. It is our conclusion that amino acids are not present in the lunar regolith above the background levels of our investigation (ca. 1 - 3 ng/g). The scientific debate has become heated that primitive life existed on Mars 3.6 billion years ago as reported by the NASA-Stanford team led to David McKay. Mars is destined to receive humans early in the 21st Century, preceded by many international missions to Space Station Freedom and robotic missions to the Moon and Mars. First, we must `learn to live in space'. The Moon presents a base that provides the opportunities and challenges to assemble the international interdisciplinary intellectual scientific teams and partners with many disciplines to make the next step before human exploration of Mars and the search for evidence in Martian soil and samples returned to Earth laboratories. Our experiences learned in Moon analysis will be useful in Mars exploration and returned sample study. Sensitivity at the nanogram/gram level and selectivity of analysis are highly essential. As these figures show contamination of samples is a most serious problem. However with the use of ultraclean techniques in a 100 clean room contamination can be avoided. Our speck of dust, a tiny fragment of cigarette smoke, a particle of dandruff, a droplet of saliva, all can make your results questionable. In addition, the extraction of life molecules as amino acids from the Lunar samples was a difficult process and I am sure the same difficulties exist with handling and removing the very low levels of amino acids from Mars meteorites and returned samples.

Gehrke, Charles W.

1997-07-01

109

Examining the Symptom-Level Specificity of Negative Problem Orientation in a Clinical Sample.  

PubMed

Given the equivocal state of the literature as to the symptom-level specificity of the cognitive variable labeled negative problem orientation (NPO), we targeted NPO-symptom relations. A clinical sample (N = 132) of adults diagnosed with an anxiety disorder, mood disorder, or obsessive-compulsive disorder completed self-reports of NPO and symptom types (worry, depression, obsessive-compulsive, panic, and social anxiety). Symptom-level specificity was examined using a combination of zero-order and regression analyses that controlled for the other assessed symptoms. Results were that NPO shared small to moderate correlations with the symptoms. Regression results indicated that NPO only shared unique associations with worry, depression, and social anxiety. In the analyses, NPO clustered particularly strongly with worry. The present results provide support for conceptualizing NPO as a cognitive variable common to emotional disorders, but not as related equivalently to all disorders within this category. PMID:25491568

Fergus, Thomas A; Valentiner, David P; Wu, Kevin D; McGrath, Patrick B

2014-12-10

110

Information Processing Profiles of Internalizing and Externalizing Behavior Problems: Evidence from a Population-Based Sample of Preadolescents  

ERIC Educational Resources Information Center

Background: The present study explores the relationships between several information processing capacities and internalizing and externalizing behavior problems in a general population sample of 10- to 12-year olds (N = 2,037 51% girls). Methods: Parent-reported behavior problems as assessed by the Child Behavior Checklist were used to form four…

Brunnekreef, J. Agnes; De Sonneville, Leo M. J.; Althaus, Monika; Minderaa, Ruud B.; Oldehinkel, Albertine J.; Verhulst, Frank C.; Ormel, Johan

2007-01-01

111

The Comparative Impacts of Risk and Protective Factors on Alcohol-Related Problems in a Sample of University Students  

ERIC Educational Resources Information Center

The purpose of this study was to examine the comparative influences of various protective and risk factors on the alcohol-related problems of a sample of university students. The conceptualization of these protective and risk factors in the current undertaking was informed by problem behavior theory, and draws heavily on two sociological theories…

Durkin, Keith F.; Blackston, Amber; Dowd, Sabrina; Franz, Shalleigh; Eagle, Trevor

2009-01-01

112

Eating Problems and Their Risk Factors: A 7-Year Longitudinal Study of a Population Sample of Norwegian Adolescent Girls  

ERIC Educational Resources Information Center

The longitudinal stability of eating problems and their relationships to risk factors were investigated in a representative population sample of 623 Norwegian girls aged 13-14 followed over 7 years (3 time points). Three eating problem symptoms were measured: Restriction, Bulimia-food preoccupation, and Diet, all taken from the 12-item Eating…

Kansi, Juliska; Wichstrom, Lars; Bergman, Lars R.

2005-01-01

113

Sampling riverine sediments impacted by acid mine drainage: problems and solutions  

Microsoft Academic Search

Sampling acid mine drainage (AMD) or natural acid rock drainage (ARD)-impacted sediments is complex, requiring appropriate\\u000a field sampling techniques to ensure representative samples that are both repeatable and reproducible. The important factors\\u000a affecting sampling of riverine sediments are examined. These include sample site location, field observations, representative\\u000a sampling, sample collection techniques, and sample preservation. A recommended sampling and processing protocol

C. Herr; N. F. Gray

1997-01-01

114

Hyperbolic heat conduction problems involving non-Fourier effects - Numerical simulations via explicit Lax-Wendroff/Taylor-Galerkin finite element formulations  

NASA Technical Reports Server (NTRS)

Numerical simulations are presented for hyperbolic heat-conduction problems that involve non-Fourier effects, using explicit, Lax-Wendroff/Taylor-Galerkin FEM formulations as the principal computational tool. Also employed are smoothing techniques which stabilize the numerical noise and accurately predict the propagating thermal disturbances. The accurate capture of propagating thermal disturbances at characteristic time-step values is achieved; numerical test cases are presented which validate the proposed hyperbolic heat-conduction problem concepts.

Tamma, Kumar K.; Namburu, Raju R.

1989-01-01

115

The Effects of the Family-Involved SDLMI on Academic Engagement and Goal Attainment of Middle School Students with Disabilities Who Exhibit Problem Behavior  

ERIC Educational Resources Information Center

The purpose of this study is to investigate the effects of the Family-Involved Self-Determination Learning Model of Instruction (SDLMI) on academic engagement and goal attainment of middle school students with disabilities who exhibit problem behavior. Intervention was provided to the experimental group (12 students with their families and special…

Kim, Nam Hee; Park, Jiyeon

2012-01-01

116

Predictors of reported current and lifetime substance abuse problems among a national sample of U.S. homeless.  

PubMed

Using the National Survey of Homeless Assistance Providers and Clients (NSHAPC), this study examined predictors of alcohol and drug problems among a national probability sample of homeless and previously homeless adults in the United States. Consistent with research, about one third and one quarter of the respondents reported a current alcohol and drug problem, respectively. A larger proportion reported lifetime substance abuse problems. As hypothesized, males, younger respondents, veterans, and those with mental and physical health problems were at greater risk. Results reveal that substance abuse treatment and prevention programs for the homeless should take into consideration these characteristics to maximize effectiveness. PMID:17934993

Dietz, Tracy L

2007-01-01

117

The Interaction of Conduct Problems and Depressed Mood in Relation to Adolescent Substance Involvement and Peer Substance Use  

PubMed Central

Conduct problems are strong positive predictors of substance use and problem substance use among teens, whereas predictive associations of depressed mood with these outcomes are mixed. Conduct problems and depressed mood often co-occur, and such co-occurrence may heighten risk for negative outcomes. Thus, this study examined the interaction of conduct problems and depressed mood at age 11 in relation to substance use and problem use at age 18, and possible mediation through peer substance use at age 16. Analyses of multirater longitudinal data collected from 429 rural youths (222 girls) and their families were conducted using a methodology for testing latent variable interactions. The link between the conduct problems X depressed mood interaction and adolescent substance use was negative and statistically significant. Unexpectedly, positive associations of conduct problems with substance use were stronger at lower levels of depressed mood. A significant negative interaction in relation to peer substance use also was observed, and the estimated indirect effect of the interaction on adolescent use through peer use as a mediator was statistically significant. Findings illustrate the complexity of multiproblem youth. PMID:18455886

Hitchings, Julia E.; Spoth, Richard L.

2010-01-01

118

Math 203 Sample Exam 2 The problems that are given below are all plausible exam problems. Be sure  

E-print Network

. A herpetologist finds that the mean weight of adult lounging tweeter frogs is 45 grams, with a standard deviation of 2 grams. What fraction of the frogs have weight in excess of 51 grams? One hundred frogs weight of the frogs in this sample is 46 grams. Is this surprising? Document your conclusion

Walker, Judy

119

Sampling solution traces for the problem of sorting permutations by signed reversals  

PubMed Central

Background Traditional algorithms to solve the problem of sorting by signed reversals output just one optimal solution while the space of all optimal solutions can be huge. A so-called trace represents a group of solutions which share the same set of reversals that must be applied to sort the original permutation following a partial ordering. By using traces, we therefore can represent the set of optimal solutions in a more compact way. Algorithms for enumerating the complete set of traces of solutions were developed. However, due to their exponential complexity, their practical use is limited to small permutations. A partial enumeration of traces is a sampling of the complete set of traces and can be an alternative for the study of distinct evolutionary scenarios of big permutations. Ideally, the sampling should be done uniformly from the space of all optimal solutions. This is however conjectured to be ?P-complete. Results We propose and evaluate three algorithms for producing a sampling of the complete set of traces that instead can be shown in practice to preserve some of the characteristics of the space of all solutions. The first algorithm (RA) performs the construction of traces through a random selection of reversals on the list of optimal 1-sequences. The second algorithm (DFALT) consists in a slight modification of an algorithm that performs the complete enumeration of traces. Finally, the third algorithm (SWA) is based on a sliding window strategy to improve the enumeration of traces. All proposed algorithms were able to enumerate traces for permutations with up to 200 elements. Conclusions We analysed the distribution of the enumerated traces with respect to their height and average reversal length. Various works indicate that the reversal length can be an important aspect in genome rearrangements. The algorithms RA and SWA show a tendency to lose traces with high average reversal length. Such traces are however rare, and qualitatively our results show that, for testable-sized permutations, the algorithms DFALT and SWA produce distributions which approximate the reversal length distributions observed with a complete enumeration of the set of traces. PMID:22704580

2012-01-01

120

Temporal stability of DSM-5 posttraumatic stress disorder criteria in a problem-drinking sample.  

PubMed

The 5th edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) reformulated posttraumatic stress disorder (PTSD) based partially on research showing there were 4 main factors that underlie the symptoms of the disorder. The primary aim of this study was to examine the temporal stability of the DSM-5 factors as measured by the Posttraumatic Stress Disorder Checklist for DSM-5 (PCL-5; Weathers et al., 2010). Confirmatory factor analyses were conducted to examine the structure of DSM-5 PTSD, and temporal stability over 3 time points was examined to determine if the measure reflects a consistent construct over time. Our sample was 507 combat-exposed veterans of Iraq and Afghanistan who enrolled in an online intervention for problem drinking and combat-related stress (Brief et al., 2013). We administered the PCL-5 at baseline, 8-week postintervention, and 3-month follow-up assessments. The DSM-5 model provided an adequate fit to the data at baseline. Tests of equality of form and equality of factor loadings demonstrated stability of the factor structure over time, indicating temporal stability. This study confirmed the results of previous research supporting the DSM-5 model of PTSD symptoms (Elhai et al., 2012; Miller et al., 2013). This is the 1st study to demonstrate the temporal stability of the PCL-5, indicating its use in longitudinal studies measures the same construct over time. (PsycINFO Database Record (c) 2014 APA, all rights reserved). PMID:24932642

Keane, Terence M; Rubin, Amy; Lachowicz, Mark; Brief, Deborah; Enggasser, Justin L; Roy, Monica; Hermos, John; Helmuth, Eric; Rosenbloom, David

2014-12-01

121

Improving Children's Creative Problem Solving Ability: Effects of Distribution of Training, Teacher Involvement, and Teacher's Divergent Thinking Ability on Instruction. Final Report.  

ERIC Educational Resources Information Center

This report investigates improvement of pupils' creative thinking and problem-solving abilities through direct educational efforts. The sample consisted of 739 pupils and their teachers from 36 fifth grade classes in two Indiana public school systems. Five sub-tests from the Torrance Tests of Creative Thinking were administered to all teachers to…

Treffinger, Donald J.

122

The Problem of Sample Contamination in a Fluvial Geochemistry Research Experience for Undergraduates.  

ERIC Educational Resources Information Center

Introduces the analysis of a river as an excellent way to teach geochemical techniques because of the relative ease of sample collection and speed of sample analysis. Focuses on the potential sources of sample contamination during sampling, filtering, and bottle cleaning processes, and reviews methods to reduce and detect contamination. Includes…

Andersen, Charles B.

2001-01-01

123

Determination of Carbon Disulfide at the Workplace by Sampling on Charcoal Tubes—Problems and Solutions  

Microsoft Academic Search

The aim of the study was to check the reliability and comparability of different analytical methods for ambient monitoring of carbon disulfide (CS2). A stationary sampling system, consisting of a charcoal sampling tube and pump, and two personal sampling systems, consisting of a charcoal sampling tube and a portable pump and of a diffusive charcoal sampler have been compared. The

Th. Göen; J. Müller; J. Angerer; H. Drexler

2002-01-01

124

Longitudinal Associations of Alcohol Involvement with Subjective Well-Being in Adolescence and Prediction to Alcohol Problems in Early Adulthood  

ERIC Educational Resources Information Center

Adolescent alcohol involvement is associated with numerous negative outcomes, but also appears to have positive correlates, including subjective well-being. Additional research is needed to understand these paradoxical findings. The current study examines alcohol use, adverse alcohol-related (and other substance-related) consequences, and…

Mason, W. Alex; Spoth, Richard L.

2011-01-01

125

Behavior Problems and Placement Change in a National Child Welfare Sample: A Prospective Study  

ERIC Educational Resources Information Center

Objective: There is ongoing debate regarding the impact of youth behavior problems on placement change in child welfare compared to the impact of placement change on behavior problems. Existing studies provide support for both perspectives. The purpose of this study was to prospectively examine the relations of behavior problems and placement…

Aarons, Gregory A.; James, Sigrid; Monn, Amy R.; Raghavan, Ramesh; Wells, Rebecca S.; Leslie, Laurel K.

2010-01-01

126

Sampling  

NSDL National Science Digital Library

This tutorial covers some of the key terms in sampling like "population" and "sampling frame," some of the statistical terms used in sampling, and the major distinction between probability and Nonprobability sampling methods.

William Trochim (Cornell University)

2006-10-20

127

Negative-energy states in the Dirac-Hartree-Fock problem - The effect of omission of two-electron integrals involving the small component  

NASA Technical Reports Server (NTRS)

The effect of omission of two-electron integrals involving basis functions for the small component of the wavefunction on the eigenvalue spectrum in the Dirac-Hartree-Fock problem is studied. From an analysis of the Fock matrix it is shown that omission of these integrals moves the negative-energy states down, not up. Their complete omission does not give rise to intruder states. The appearance of intruder states occurs when only some of the core integrals are omitted, due to the nature of particular contraction schemes used for the core basis functions. Use of radially localized functions rather than atomic functions alleviates the intruder state problem.

Dyall, Kenneth G.

1992-01-01

128

A Longitudinal Examination of the Relationship between Adolescent Problem Behaviors and Traffic Crash Involvement during Young Adulthood  

Microsoft Academic Search

Previous research examining the relationship between adolescent problem behaviors and young adult traffic outcomes (crashes, convictions, risky driving) has produced differing results. Possible reasons for this may be the heterogeneity of the crash outcomes (from minor fender-benders to fatal crashes), the gender of the driver, and\\/or the age of the driver. The aim of this research was to investigate the

Dorothy J. Begg; Pauline Gulliver

2008-01-01

129

Sample Sizes Required to Detect Two-Way and Three-Way Interactions Involving Slope Differences in Mixed-Effects Linear Models  

Microsoft Academic Search

Based on maximum likelihood estimates obtained from mixed-effects linear models, closed-form power functions are derived to detect two-way and three-way interactions that involve longitudinal course of outcome over time in clinical trials. Sample size estimates are shown to decrease with increasing within-subject correlations. It is further shown that when clinical trial designs are balanced in group sizes, the sample size

Moonseong Heo; Andrew C. Leon

2010-01-01

130

A separation theorem for the stochastic sampled-data LQG problem. [control of continuous linear plant disturbed by white noise  

NASA Technical Reports Server (NTRS)

This paper considers the control of a continuous linear plant disturbed by white plant noise when the control is constrained to be a piecewise constant function of time; i.e. a stochastic sampled-data system. The cost function is the integral of quadratic error terms in the state and control, thus penalizing errors at every instant of time while the plant noise disturbs the system continuously. The problem is solved by reducing the constrained continuous problem to an unconstrained discrete one. It is shown that the separation principle for estimation and control still holds for this problem when the plant disturbance and measurement noise are Gaussian.

Halyo, N.; Caglayan, A. K.

1976-01-01

131

The Clark phaseable sample size problem: long-range phasing and loss of heterozygosity in GWAS.  

PubMed

A phase transition is taking place today. The amount of data generated by genome resequencing technologies is so large that in some cases it is now less expensive to repeat the experiment than to store the information generated by the experiment. In the next few years, it is quite possible that millions of Americans will have been genotyped. The question then arises of how to make the best use of this information and jointly estimate the haplotypes of all these individuals. The premise of this article is that long shared genomic regions (or tracts) are unlikely unless the haplotypes are identical by descent. These tracts can be used as input for a Clark-like phasing method to obtain a phasing solution of the sample. We show on simulated data that the algorithm will get an almost perfect solution if the number of individuals being genotyped is large enough and the correctness of the algorithm grows with the number of individuals being genotyped. We also study a related problem that connects copy number variation with phasing algorithm success. A loss of heterozygosity (LOH) event is when, by the laws of Mendelian inheritance, an individual should be heterozygote but, due to a deletion polymorphism, is not. Such polymorphisms are difficult to detect using existing algorithms, but play an important role in the genetics of disease and will confuse haplotype phasing algorithms if not accounted for. We will present an algorithm for detecting LOH regions across the genomes of thousands of individuals. The design of the long-range phasing algorithm and the loss of heterozygosity inference algorithms was inspired by our analysis of the Multiple Sclerosis (MS) GWAS dataset of the International Multiple Sclerosis Genetics Consortium. We present similar results to those obtained from the MS data. PMID:21385037

Halldórsson, Bjarni V; Aguiar, Derek; Tarpine, Ryan; Istrail, Sorin

2011-03-01

132

Caregiver unresolved loss and abuse and child behavior problems: intergenerational effects in a high-risk sample.  

PubMed

This study examines the intergenerational effects of caregivers' unresolved loss and abuse on children's behavior problems from middle childhood to early adolescence in an economically disadvantaged sample. One hundred twenty-four caregivers completed the Adult Attachment Interview (AAI) and a lifetime trauma interview during the age 13 wave of the study. Child behavior problems were assessed at four time points (ages 6, 8, 10, and 13) with teacher-reported Child Behavior Checklist total problem scales. The children of insecure caregivers with unresolved loss showed a consistent pattern of increased behavior problems from middle childhood to early adolescence. Caregivers' AAI status accounted for more variance in child behavior problems than did an alternative model of caregiver psychopathology (depression and dissociation). The results extend the literature on the effects of caregiver unresolved states of mind beyond infancy to older children and adolescents. PMID:19144229

Zajac, Kristyn; Kobak, Roger

2009-01-01

133

Physics 228 Lecture 19 Appendix B 1 Winter 2009 Lecture 19 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems using delta functions and Green functions (Chapter (see L28 on page 470 in Boas) 0 0 0 0 : . 0: t t t t e t t y t t t §8.11: 13 Solution: Now.11.19 in Boas. We have #12;Physics 228 Lecture 19 Appendix B 3 Winter 2009

Ellis, Steve

134

Physics 227 Lecture 12 Appendix B 1 Autumn 2008 Lecture 12 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems assigned for Chapter 6, sections 3 to 7. §6.3: 7.13 in Boas. We find 2 2 ^ ^^ ^ ^ ^ ^ ^^ ^ ^ ^2 2 ^ ^^ ^2 ^^ 2 . r t r t r t r rr rr rr r r rr rr rr

Ellis, Steve

135

Physics 228 Lecture 20 Appendix B 1 Winter 2009 Lecture 20 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems assigned for Chapter 9. §9.3: 6 Solution the independent variable as described in Boas or use the result of Eq. (20.13) in Lecture 20. Here we use explicit x dependence. Hence we can switch to y being the independent variable as described in Boas (as

Ellis, Steve

136

Physics 227 Lecture 9 Appendix B 1 Autumn 2008 Lecture 9 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems assigned for Chapter 3.12. §3.12: 15 Consider the equations of motion for the system (see the examples in Boas, Section 3.12). These equations can be obtained

Ellis, Steve

137

Physics 227 Lecture 10 Appendix B 1 Autumn 2008 Lecture 10 Appendix B: Some sample problems from Boas  

E-print Network

Boas Here are some solutions to the sample problems assigned for Chapter 3.13. §3.13: 6 We consider) and essentially the same as (isomorphic to) the tables in Eqs. 13.1 and 13.2 in Boas. Thus this group

Ellis, Steve

138

Ten-Year Comparisons of Problems and Competencies for National Samples of Youth: Self, Parent, and Teacher Reports.  

ERIC Educational Resources Information Center

This study compared national samples of United States' 11- to 18- year-olds assessed in 1989 and 1999. Parent, teacher and self-report sources showed small improvements in competencies and adaptive functioning and small declines in problems over ten years. No significant differences on any scales were found for youths assessed shortly before and…

Achenbach, Thomas M.; Dumenci, Levent; Rescorla, Leslie A.

2002-01-01

139

Self-Report Measures of Child and Adolescent Psychopathy as Predictors of Offending in Four Samples of Justice-Involved Youth  

ERIC Educational Resources Information Center

The authors examined the relation between self-report psychopathy measures and official records of offending in four samples of justice-involved youth (total N = 447). Psychopathy measures included the Antisocial Process Screening Device (APSD) and a modified version of the Childhood Psychopathy Scale (mCPS). Measures of offending included the…

Boccaccini, Marcus T.; Epstein, Monica; Poythress, Norman; Douglas, Kevin S.; Campbell, Justin; Gardner, Gail; Falkenbach, Diana

2007-01-01

140

Application of the Tripartite Model to a Complicated Sample of Residential Youth with Externalizing Problems  

ERIC Educational Resources Information Center

The tripartite model of anxiety and depression has received strong support among child and adolescent populations. Clinical samples of children and adolescents in these studies, however, have usually been referred for treatment of anxiety and depression. This study investigated the fit of the tripartite model with a complicated sample of…

Chin, Eu Gene; Ebesutani, Chad; Young, John

2013-01-01

141

Problems Found Using a Radon Stripping Algorithm for Retrospective Assessment of Air Filter Samples  

Microsoft Academic Search

An evaluation of a large number of air sample filters was undertaken using a commercial alpha and beta spectroscopy system employing a passive implanted planar silicon (PIPS) detector. Samples were only measured after air flow through the filters had ceased. Use of a commercial radon stripping algorithm was implemented to discriminate anthropogenic alpha activity on the filters from the radon

Robert B. Hayes

2008-01-01

142

Emotional and behavioural problems in a sample of Finnish three-year-olds  

Microsoft Academic Search

Behavioural and emotional problems in Finnish three-year-olds was studied using the Child Behavior Checklist for ages 2–3\\u000a as a standardised rating scale at well-baby clinics in two cities in Finland. Altogether 374 questionnaires were analysed\\u000a which is 71% of the target population. When compared with studies from other countries the mean scores and prevalences of\\u000a preschool children's problem behaviours were

A. Sourander

2001-01-01

143

A sample path approach for solving the ground-holding policy problem in air traffic control  

Microsoft Academic Search

We address the ground-holding problem in air traffic control and propose two techniques that can be used to dynamically solve this problem. The first is motivated by the kanban control policy extensively used in manufacturing systems to reduce the work-in-process inventory, while the second one uses finite perturbation analysis (FPA) for discrete-event systems. We show that the latter leads to

Christos G. Panayiotou; Christos G. Cassandras

1999-01-01

144

A Multidimensional Model of Adolescent Drug Involvement.  

ERIC Educational Resources Information Center

Tested a multidimensional model of adolescent drug involvement on samples of high school students. Focused on five first-order dimensions: drug access, alcohol use, other drug use, drug control problems, and adverse drug use consequences. Results contributed to understanding differences and change in drug involvement among high-risk versus…

Herting, Jerald R.; And Others

1996-01-01

145

PeptideManager: a peptide selection tool for targeted proteomic studies involving mixed samples from different species  

PubMed Central

The search for clinically useful protein biomarkers using advanced mass spectrometry approaches represents a major focus in cancer research. However, the direct analysis of human samples may be challenging due to limited availability, the absence of appropriate control samples, or the large background variability observed in patient material. As an alternative approach, human tumors orthotopically implanted into a different species (xenografts) are clinically relevant models that have proven their utility in pre-clinical research. Patient derived xenografts for glioblastoma have been extensively characterized in our laboratory and have been shown to retain the characteristics of the parental tumor at the phenotypic and genetic level. Such models were also found to adequately mimic the behavior and treatment response of human tumors. The reproducibility of such xenograft models, the possibility to identify their host background and perform tumor-host interaction studies, are major advantages over the direct analysis of human samples. At the proteome level, the analysis of xenograft samples is challenged by the presence of proteins from two different species which, depending on tumor size, type or location, often appear at variable ratios. Any proteomics approach aimed at quantifying proteins within such samples must consider the identification of species specific peptides in order to avoid biases introduced by the host proteome. Here, we present an in-house methodology and tool developed to select peptides used as surrogates for protein candidates from a defined proteome (e.g., human) in a host proteome background (e.g., mouse, rat) suited for a mass spectrometry analysis. The tools presented here are applicable to any species specific proteome, provided a protein database is available. By linking the information from both proteomes, PeptideManager significantly facilitates and expedites the selection of peptides used as surrogates to analyze proteins of interest. PMID:25228907

Demeure, Kevin; Duriez, Elodie; Domon, Bruno; Niclou, Simone P.

2014-01-01

146

Prevalence and Correlates of Gambling Problems Among a Nationally Representative Sample of Brazilian Adolescents  

Microsoft Academic Search

The objectives of the study are: (a) to provide the first prevalence estimates of pathological gambling among Brazilian adolescents\\u000a using an age-specific instrument in a nationally representative sample; (b) to investigate the extent to which adolescents\\u000a participate in gambling activities in a developing country; and (c) to correlate different levels of gambling behavior with\\u000a demographic variables. Multistage cluster sampling selected

Daniel Tornaim Spritzer; Luis Augusto Rohde; Daniela Bumaguin Benzano; Ronaldo Ramos Laranjeira; Ilana Pinsky; Marcos Zaleski; Raul Caetano; Hermano Tavares

147

Aggressive Behavior Problems in Children with Autism Spectrum Disorders: Prevalence and Correlates in a Large Clinical Sample.  

PubMed

Aggressive behavior problems (ABP) are frequent yet poorly understood in children with Autism Spectrum Disorders (ASD) and are likely to co-vary significantly with comorbid problems. We examined the prevalence and sociodemographic correlates of ABP in a clinical sample of children with ASD (N = 400; 2-16.9 years). We also investigated whether children with ABP experience more intensive medical interventions, greater impairments in behavioral functioning, and more severe comorbid problems than children with ASD who do not have ABP. One in four children with ASD had Child Behavior Checklist scores on the Aggressive Behavior scale in the clinical range (T-scores ? 70). Sociodemographic factors (age, gender, parent education, race, ethnicity) were unrelated to ABP status. The presence of ABP was significantly associated with increased use of psychotropic drugs and melatonin, lower cognitive functioning, lower ASD severity, and greater comorbid sleep, internalizing, and attention problems. In multivariate models, sleep, internalizing, and attention problems were most strongly associated with ABP. These comorbid problems may hold promise as targets for treatment to decrease aggressive behavior and proactively identify high-risk profiles for prevention. PMID:25221619

Hill, Alison Presmanes; Zuckerman, Katharine E; Hagen, Arlene D; Kriz, Daniel J; Duvall, Susanne W; van Santen, Jan; Nigg, Joel; Fair, Damien; Fombonne, Eric

2014-09-01

148

A latent class analysis of underage problem drinking: Evidence from a community sample of 16–20 year olds  

Microsoft Academic Search

The aim of this paper is to shed light on the nature of underage problem drinking by using an empirically based method to characterize the variation in patterns of drinking in a community sample of underage drinkers. A total of 4056 16–20-year-old current drinkers from 212 communities in the US were surveyed by telephone as part of the National Evaluation

Beth A. Reboussin; Eun-Young Song; Anshu Shrestha; Kurt K. Lohman; Mark Wolfson

2006-01-01

149

Clinically Significant Trauma Symptoms and Behavioral Problems in a Community-based Sample of Children Exposed to Domestic Violence  

Microsoft Academic Search

This study assessed the associations of characteristics of domestic violence incidents with clinically significant levels\\u000a of traumatic symptoms and behavioral problems in a socio-economically and ethnically mixed sample of 687 children participating\\u000a in a community-service program for children witnessing violence. Study predictors included child\\/family demographic characteristics,\\u000a type and chronicity of exposure, and child’s perceptions of control over the event and

James C. Spilsbury; Lara Belliston; Dennis Drotar; Allyson Drinkard; Jeff Kretschmar; Rosemary Creeden; Daniel J. Flannery; Steve Friedman

2007-01-01

150

The relationship between cognitive emotion regulation strategies and emotional problems: comparison between a clinical and a non-clinical sample  

Microsoft Academic Search

This study focuses on the relationship between the use of specific cognitive emotion regulation strategies and emotional problems. Two samples were included: 99 adults from a clinical population and 99 matched non-clinical adults. Data was obtained in both groups on the use of nine cognitive emotion regulation strategies: self-blame, other-blame, rumination, catastrophizing, putting into perspective, positive refocusing, positive reappraisal, acceptance,

Nadia Garnefski; Tessa Van Den Kommer; Vivian Kraaij; Jan Teerds; Jeroen Legerstee; Evert Onstein

2002-01-01

151

Discussion Problem Solutions D1. The agent can increase his sample size to a value greater than 10. The larger the  

E-print Network

225 Chapter 7 Discussion Problem Solutions D1. The agent can increase his sample size to a value greater than 10. The larger the sample size, the smaller the spread of the distribution of means million in the sampling distribution for samples of size 10 in Display 7.3, you would have to pick all ten

D'Orsogna, Maria Rita

152

PROBLEMS OF EDUCATIONAL EVALUATION IN PROJECT HEAD START--SAMPLING, DESIGN, AND CONTROL GROUPS.  

ERIC Educational Resources Information Center

CONTRARY TO THE OPINION OF MANY PEOPLE, PROJECT HEADSTART (HS) IS NOT A STABLE AND UNIFORM PROGRAM WHICH DEALS WITH AN EASILY DEFINABLE POPULATION. THERE ARE, THEREFORE, SEVERAL PROBLEMS WHICH EXIST IN CONNECTION WITH EVALUATIVE RESEARCH CONCERNED WITH HS. IN ORDER TO PROVIDE GUIDANCE IN PROGRAM PLANNING, THIS RESEARCH SEEKS TO DESCRIBE POTENTIAL…

MCDAVID, JOHN W.

153

Eating Problems at Age 6 Years in a Whole Population Sample of Extremely Preterm Children  

ERIC Educational Resources Information Center

Aim: The aim of this study was to investigate the prevalence of eating problems and their association with neurological and behavioural disabilities and growth among children born extremely preterm (EPC) at age 6 years. Method: A standard questionnaire about eating was completed by parents of 223 children (125 males [56.1%], 98 females [43.9%])…

Samara, Muthanna; Johnson, Samantha; Lamberts, Koen; Marlow, Neil; Wolke, Dieter

2010-01-01

154

Obsessive-Compulsive Disorder and Comorbid Anxiety Problems in a National Anxiety Screening Sample  

Microsoft Academic Search

Questionnaire data were obtained from 5867 participants attending a national anxiety screening program. These participants were selected from more than 15,000 respondents on the basis of never having received treatment for a mental health problem. A screening instrument was designed to assess five anxiety disorders (obsessive-compulsive disorder, posttraumatic stress disorder, social phobia, generalized anxiety disorder, and panic disorder). The present

Lawrence A Welkowitz; Elmer L Struening; John Pittman; Mary Guardino; Joan Welkowitz

2000-01-01

155

Rank Tests for Two-Sample Problems Based on Multiple Type-II Censored Data  

Microsoft Academic Search

In this article, we study the effect of censoring on the asymptotic efficiency of the two-sample rank tests based on multiple Type-II censored data. Since the scores generating functions associated with these test statistics have a finite number of jump discontinuities, we use a slightly modified version of a theorem of Dupac and Hajek (1969) to obtain their asymptotic distributions

M. S. Chikkagoudar; B. S. Biradar

2010-01-01

156

Unrealistic optimism about susceptibility to health problems: Conclusions from a community-wide sample  

Microsoft Academic Search

A mailed questionnaire was used to obtain comparative risk judgments for 32 different hazards from a random sample of 296 individuals living in central New Jersey. The results demonstrate that an optimistic bias about susceptibility to harm-a tendency to claim that one is less at risk than one's peers—is not limited to any particular age, sex, educational, or occupational group.

Neil D. Weinstein

1987-01-01

157

Problems Found Using a Radon Stripping Algorithm for Retrospective Assessment of Air Filter Samples  

SciTech Connect

An evaluation of a large number of air sample filters was undertaken using a commercial alpha and beta spectroscopy system employing a passive implanted planar silicon (PIPS) detector. Samples were only measured after air flow through the filters had ceased. Use of a commercial radon stripping algorithm was implemented to discriminate anthropogenic alpha activity on the filters from the radon progeny. When uncontaminated air filters were evaluated, the results showed that there was a time-dependent bias in both average estimates and measurement dispersion of anthropogenic activity estimates with the relative bias being small compared to the dispersion, indicating that the system would not give false positive indications for an appropriately set decision level. By also measuring environmental air sample filters simultaneously with electroplated alpha filters, use of the radon stripping algorithm demonstrated a number of substantial unexpected deviations from calibrated values indicating that the system would give false negative indications. Use of the current algorithm is, therefore, not recommended for general assay applications. Use of the PIPS detector should only be utilized for gross counting without appropriate modifications to the curve-fitting algorithm. As a screening method, the radon stripping algorithm might be expected to see elevated alpha activities on air sample filters (not due to radon progeny) around the 200 disintegrations per minute level.

Robert Hayes

2008-04-01

158

Sampling Plausible Solutions to Multi-body Constraint Problems Stephen Chenney D. A. Forsyth  

E-print Network

plausible sources of uncertainty, and then use a Markov chain Monte Carlo algorithm to sample mul- tiple and Statistics]: Probabilistic al- gorithms; Keywords: plausible motion, Markov chain Monte Carlo, motion the animation has email: {schenney,daf}@cs.berkeley.edu a limited effect on where the dice land, but a small

Forsyth, David

159

Sampling Plausible Solutions to Multi-body Constraint Problems Stephen Chenney D. A. Forsyth  

E-print Network

plausible sources of uncertainty, and then use a Markov chain Monte Carlo algorithm to sample mul- tiple- abilistic algorithms; Keywords: plausible motion, Markov chain Monte Carlo, motion synthesis, spacetime. The bumps are more effective because a small change to a bump part-way through the animation has a limited

DeCarlo, Doug

160

PROBLEMS WITH A NAFION (TRADE NAME) MEMBRANE DRYER FOR DRYING CHROMATOGRAPHIC SAMPLES  

EPA Science Inventory

A Nafion membrane dryer was used to dry samples of organic gases emitted by vegetation before chromatographic separation to reduce water-related retention time variations on a fused-silica column. The dryer caused rearrangement of several monoterpenes and removed several importan...

161

Gambling behavior subtypes among respondents with gambling-related problems in a population-based sample.  

PubMed

Latent class analysis was used to delineate distinctive subgroups of gamblers and examine whether they differed by demographics and gambling severity. Data from three Canadian provinces focused on respondents who reported at least some risk of problem gambling in the past year (N=1,071). Three latent classes were distinguished: a low on most items group (class 1), a behaviorally conditioned/substance abusing impulsive/emotionally vulnerable (or all types) group (class 2), and a familial-genetic/behaviorally conditioned group (class 3). Gamblers in classes 2 and 3 were most likely to be moderate-risk and problem gamblers. Community-based prevention efforts may need to address each subgroup differently but also according to their characteristics. PMID:21491298

Martins, Silvia S; Ghandour, Lilian A; Storr, Carla L

2011-04-01

162

Problems and prospects of investigating the formation and evolution of agglomerates by the sampling method  

Microsoft Academic Search

Problems related to the interpretation of information obtained from an analysis of collected particles of condensed combustion\\u000a products of aluminized propellants are considered. It is shown that the difficulties that arise are due to three main factors:\\u000a the complex statistical character of the combustion of heterogeneous propellants, which results in formation of agglomerates\\u000a with a substantially polydisperse distribution in size

O. G. Glotov; V. E. Zarko; V. V. Karasev

2000-01-01

163

Problems associated with using filtration to define dissolved trace element concentrations in natural water samples  

USGS Publications Warehouse

Field and laboratory experiments indicate that a number of factors associated with filtration other than just pore size (e.g., diameter, manufacturer, volume of sample processed, amount of suspended sediment in the sample) can produce significant variations in the 'dissolved' concentrations of such elements as Fe, Al, Cu, Zn, Pb, Co, and Ni. The bulk of these variations result from the inclusion/exclusion of colloidally associated trace elements in the filtrate, although dilution and sorption/desorption from filters also may be factors. Thus, dissolved trace element concentrations quantitated by analyzing filtrates generated by processing whole water through similar pore-sized filters may not be equal or comparable. As such, simple filtration of unspecified volumes of natural water through unspecified 0.45-??m membrane filters may no longer represent an acceptable operational definition for a number of dissolved chemical constituents.

Horowitz, A.J.; Lum, K.R.; Garbarino, J.R.; Hall, G.E.M.; Lemieux, C.; Demas, C.R.

1996-01-01

164

Frontal-Parietal and Limbic-Striatal Activity Underlies Information Sampling in the Best Choice Problem.  

PubMed

Best choice problems have a long mathematical history, but their neural underpinnings remain unknown. Best choice tasks are optimal stopping problem that require subjects to view a list of options one at a time and decide whether to take or decline each option. The goal is to find a high ranking option in the list, under the restriction that declined options cannot be chosen in the future. Conceptually, the decision to take or decline an option is related to threshold crossing in drift diffusion models, when this process is thought of as a value comparison. We studied this task in healthy volunteers using fMRI, and used a Markov decision process to quantify the value of continuing to search versus committing to the current option. Decisions to take versus decline an option engaged parietal and dorsolateral prefrontal cortices, as well ventral striatum, anterior insula, and anterior cingulate. Therefore, brain regions previously implicated in evidence integration and reward representation encode threshold crossings that trigger decisions to commit to a choice. PMID:24142842

Costa, Vincent D; Averbeck, Bruno B

2013-10-18

165

Application of Theorem Proving to Problem Solving  

Microsoft Academic Search

This paper shows how an extension of the resolution proof procedure can be used to con­ struct problem solutions. The extended proof procedure can solve problems involving state transformations. The paper explores several alternate problem representations and provides a discussion of solutions to sample problems including the \\

C. Cordell Green

1969-01-01

166

Working conditions, adverse events and mental health problems in a sample of 949 German teachers  

Microsoft Academic Search

Objectives:  The aim of this study was (1) to explore in detail the working load of teachers, (2) to analyse the extent of negative or\\u000a threatening school-related events teachers are confronted with, and (3) to evaluate mental health strain by applying the general\\u000a health questionnaire (GHQ).\\u000a \\u000a \\u000a \\u000a Methods  A sample of 949 teachers in 10 grammar schools (German: Gymnasien) and 79 secondary modern

Joachim Bauer; Thomas Unterbrink; Anna Hack; Ruth Pfeifer; Veronika Buhl-Grießhaber; Udo Müller; Helmut Wesche; Markus Frommhold; Reingard Seibt; Klaus Scheuch; Michael Wirsching

2007-01-01

167

Importance Sampling Implemented in the Code PRIZMA for Deep Penetration and Detection Problems in Reactor Physics  

NASA Astrophysics Data System (ADS)

At RFNC-VNIITF a code PRIZMA which has been developed for more than 30 years is used to model radiation transport by the Monte Carlo method. The code implements individual and coupled tracking of neutrons, photons, electrons, positrons and ions in 1D, 2D or 3D geometry. Attendance estimators are used for tallying, i.e., the estimators whose scores are only nonzero from particles which cross a region or surface of interest. Importance sampling is used to make deep penetration and detection calculations more effective. However, its application to reactor analysis appeared peculiar and required further development. The paper reviews methods used for deep penetration and detection calculations by PRIZMA. It describes in what these calculations differ when applied to reactor analysis and how we compute approximated importance functions and parameters for biased distributions. Methods to control the statistical weight of particles are also discussed. A number of test and applied calculations which were done for the purpose of verification are provided. They are shown to agree either with asymptotic solutions if exist, or with results of analog calculations or predictions by other codes. The applied calculations include the estimation of ex-core detector response from neutron sources arranged in the core, and the estimation of in-core detector response.

Kandiev, Y. Z.; Zatsepin, O. V.

2014-06-01

168

Associations between work family conflict, emotional exhaustion, musculoskeletal pain, and gastrointestinal problems in a sample of business travelers.  

PubMed

The aim of the study was to examine the associations among work-family conflict (WFC), emotional exhaustion, musculoskeletal (MS) pain, and gastrointestinal problems on a sample of business travelers (n = 2,093). An additional aim was to examine differences in the mentioned relationships among three traveler groups: commuters, national travelers, and international travelers. The study was conducted in a large Norwegian oil and gas company, and the company's business travel database was utilized to examine business travel. Structural equation modeling (SEM) revealed significant relations between WFC and emotional exhaustion and between emotional exhaustion and health problems. Contrary to the expectations, no direct association was found between WFC and health problems. However, we found that emotional exhaustion mediated the relation between WFC and health outcomes. The results from multi-group analysis revealed that associations among WFC, emotional exhaustion, and health-outcomes showed a similar pattern for commuters, national travelers, and international travelers. However, the association between emotional exhaustion and MS pain proved to be significantly stronger for the commuter group compared to the national and international travel groups. Practical implications and the consequences of these findings for future research are discussed. PMID:25363417

Jensen, Maria Therese; Rundmo, Torbjørn

2015-02-01

169

Examining the impact of gender, race/ethnicity, and family factors on mental health issues in a sample of court-involved youth.  

PubMed

Faced with anywhere between one half and two thirds of its youth having a diagnosable mental illness, the identification and treatment of mental health concerns is a critically important endeavor for professionals working with youth who have contact with the juvenile justice system. In addition, the literature suggests that factors related to both the family and to the gender of the adolescent must be incorporated into any approach to assessment and intervention within this special population. Further, prior work that has documented the interaction of gender and family issues with adolescent race/ethnicity warrants further empirical attention, as does the intermediary role that the family may play in the development of both internalizing and externalizing behaviors. The present study extends this literature by examining factors related to gender, race/ethnicity, family factors, and mental health issues in a sample of 2,549 Caucasian and African American youth coming to the attention of juvenile courts. Multivariate analysis of variance results indicated significant main effects for gender and race/ethnicity, as well as a significant gender x race/ethnicity interaction for the family and externalizing variables. A multiple group structural equation modeling procedure was employed in order to test the hypothesis that family environment mediates the relationship between gender and mental health problems, as well as to test for potential differences in these relationships as a function of race/ethnicity. Results indicated support for the mediation model in the sample of African American youth but not in the sample of Caucasian youth. PMID:18717924

Gavazzi, Stephen M; Bostic, Jennifer M; Lim, Ji-Young; Yarcheck, Courtney M

2008-07-01

170

Familial Confounding of the Association Between Maternal Smoking during Pregnancy and Offspring Substance Use and Problems: Converging Evidence Across Samples and Measures  

PubMed Central

Context Previous epidemiological, animal, and human cognitive neuroscience research suggests that maternal smoking during pregnancy causes increased risk of offspring substance use/problems. Objective To determine the extent to which the association between SDP and offspring substance use/problems depends on confounded familial background factors by using a quasi-experimental design. Design We used two separate samples, from the United States and from Sweden, respectively. The analyses prospectively predicted multiple indices of substance use and problems while controlling for statistical covariates and comparing differentially exposed siblings to minimize confounding. Setting Sample 1: Offspring of a representative sample of women in the United States. Sample 2: The total Swedish population born over 13 years. Patients or Other Participants Sample 1: Adolescent offspring of the women in the National Longitudinal Survey of Youth 1979 (n=6,094). Sample 2: All offspring born in Sweden from 1983 through 1995 (n=1,187,360). Main Outcome Measures Sample 1: Self-reported adolescent alcohol, cigarette, and marijuana use, and early onset (before age 14 years) of each substance. Sample 2: Substance-related convictions and hospitalizations for an alcohol- or drug-related problem. Results The same pattern emerged for each index of substance use/problems across the two samples. At the population level maternal smoking during pregnancy predicted every measure of offspring substance use/problems in both samples, ranging from adolescent alcohol use (HRmoderate=1.32, CI=1.22–1.43; HRhigh=1.33, CI=1.17=1.53) to a narcotic convictions (HRmoderate=2.23, CI=2.14–2.31; HRhigh=2.97, CI=2.86–3.09). When comparing differentially exposed siblings to minimize genetic and environmental confounds, however, the association between SDP and each measure of substance use/problems was minimal and not statistically significant. Conclusions The association between maternal smoking during pregnancy and offspring substance use/problems was likely due to familial background factors, not a causal influence, because siblings had similar rates of substance use and problems regardless of their specific exposure to smoking during pregnancy. PMID:23117635

D’Onofrio, Brian M.; Rickert, Martin E.; Långström, Niklas; Donahue, Kelly L.; Coyne, Claire A.; Larsson, Henrik; Ellingson, Jarrod M.; Van Hulle, Carol A.; Iliadou, Anastasia N.; Rathouz, Paul J.; Lahey, Benjamin B.; Lichtenstein, Paul

2013-01-01

171

The Effect of Teacher's Invitations to Parental Involvement on Children's Externalizing Problem Behaviors: An Examination of a CBC Intervention. CYFS Working Paper No. 2012-3  

ERIC Educational Resources Information Center

Behavioral problems in childhood are associated with academic difficulties including in-school suspensions, high school dropout, and low academic grades and achievement scores. Students with disruptive behavior problems demonstrate higher rates of social risk factors than their nondisruptive peers, including school maladjustment, antisocial…

Coutts, Michael J.; Sheridan, Susan M.; Kwon, Kyongboon; Semke, Carrie A.

2012-01-01

172

Are Problems Prevalent and Stable in Non-Clinical Populations? Problems and Test-Retest Stability of a Patient-Generated Measure, PSYCHLOPS (Psychological Outcome Profiles), in a Non-Clinical Student Sample  

ERIC Educational Resources Information Center

In straightened times counselling must evidence the changes it promotes on reputable measures. Patient-generated measures complement nomothetic measures and may be nearer the ethos of counselling in eliciting individuals' problems. Scores from such measures from non-clinical samples are rarely reported, making their test-retest stability…

Evans, Chris; Ashworth, Mark; Peters, Marilyn

2010-01-01

173

Delinquency and Substance Use among Gang-Involved Youth: The Moderating Role of Parenting Practices  

Microsoft Academic Search

This study uses longitudinal data from an ethnically diverse sample of 300 ninth grade students to examine the moderating effect of parenting practices upon the relationship between gang involvement and adolescent problem behavior. Results of hierarchical linear modeling indicate that gang involvement is a highly significant positive predictor of each of three categories of problem behavior (minor delinquency, major delinquency,

Chanequa J. Walker-Barnes; Craig A. Mason

2004-01-01

174

Problem Solving  

NSDL National Science Digital Library

Problem solving is the thought processes involved in solving a problem. It is both a means of developing students' knowledge of mathematics and a critical outcome of a good mathematics education. A mathematical problem, as distinct from an exercise, requires the solver to search for a method for solving the problem rather than following a set procedure. Mathematical problem solving, therefore, requires an understanding of relevant concepts, procedures, and strategies. To become good problem solvers, students need many opportunities to formulate questions, model problem situations in a variety of ways, generalize mathematical relationships, and solve problems in both mathematical and everyday contexts.

K-12 Outreach,

175

Initial Reliability and Validity of the Life Satisfaction Scale for Problem Youth in a Sample of Drug Abusing and Conduct Disordered Youth  

ERIC Educational Resources Information Center

Responses to Life Satisfaction Scale for Problem Youth (LSSPY) items were examined in a sample of 193 substance abusing and conduct disordered adolescents. In responding to the LSSPY, youth endorse their percentage of happiness (0 to 100%) in twelve domains (i.e., friendships, family, school, employment/work, fun activities, appearance, sex…

Donohue, Brad; Teichner, Gordon; Azrin, Nathan; Weintraub, Noah; Crum, Thomas A.; Murphy, Leah; Silver, N. Clayton

2003-01-01

176

Pervasive and Non-Pervasive Conduct Problems in a Clinic Sample Aged 4-8 Years: Child, Family and Day-Care/School Factors  

ERIC Educational Resources Information Center

Differences between pervasive (home and day-care/school) versus non-pervasive (home only) conduct problems were examined in regard to various child, parent/family, and day-care/school characteristics in an outpatient clinic sample of 120 children aged 4-8 years. All children scored above the 90th percentile on the Eyberg Child Behavior Inventory…

Drugli, May Britt; Larsson, Bo; Clifford, Graham; Fossum, Sturla

2007-01-01

177

Stress, Mental Health, and Substance Abuse Problems in a Sample of Diversion Program Youths: An Exploratory Latent Class Analysis  

ERIC Educational Resources Information Center

Reflective of interest in mental health and substance abuse issues among youths involved with the justice system, we performed a latent class analysis on baseline information collected on 100 youths involved in two diversion programs. Results identified two groups of youths: Group 1: a majority of the youths, who had high levels of delinquency,…

Dembo, Richard; Briones, Rhissa; Gulledge, Laura; Karas, Lora; Winters, Ken C.; Belenko, Steven; Greenbaum, Paul E.

2012-01-01

178

Predictors of Parent Stress in a Sample of Children with ASD: Pain, Problem Behavior, and Parental Coping  

ERIC Educational Resources Information Center

Studies have shown that children with ASD have increased severity and incidence of pain symptoms compared to typically developing children and children with other disorders. Pain has also been shown to act as a setting event for problem behavior. Further, problem behavior is one of the biggest impediments to quality of life for families and highly…

Walsh, Caitlin E.; Mulder, Emile; Tudor, Megan E.

2013-01-01

179

Psychological and health problems in a geographically proximate population time-sampled continuously for three months after the September 11th, 2001 terrorist incidents.  

PubMed

This study assessed the mental and physical health status and psychological problems related to the September 11th terrorist incidents among a representative sample of adults living near New York City, using continuously time-sampled data collected throughout 2001. Prevalence estimates for poor mental or physical health after September 11th (October through December) were comparable to those for the entire year of 2001 (i.e. approximately 33%). Psychological problems related to the terrorist incidents were reported by more than half of the respondents, and appeared to peak in prevalence approximately two to three months following the incidents, followed by a decline in the next month and subsequent year. Poor mental health, female gender, media re-exposure, and ongoing or increased alcohol use were risk factors for psychological problems, while older age (65+ years old) and being married were protective factors. Risk factors for poor physical and mental health or psychological problems were generally stable over the three-month period following September 11th, but some changes were identified consistent with stage models of post-disaster psychological adjustment. Implications are discussed for using continuous time-sampling as a strategy to research patterns of relatively acute stress-related sequelae of terrorism in populations whose members are affected despite primarily not having been at the disaster epicenter. PMID:17999220

Ford, Julian D; Adams, Mary L; Dailey, Wayne F

2007-06-01

180

Negative affect mediates the relationship between interpersonal problems and binge-eating disorder symptoms and psychopathology in a clinical sample: a test of the interpersonal model.  

PubMed

This study evaluated the validity of the interpersonal model of binge-eating disorder (BED) psychopathology in a clinical sample of women with BED. Data from a cross-sectional sample of 255 women with BED were examined for the direct effects of interpersonal problems on BED symptoms and psychopathology, and indirect effects mediated by negative affect. Structural equation modelling analyses demonstrated that higher levels of interpersonal problems were associated with greater negative affect, and greater negative affect was associated with higher frequency of BED symptoms and psychopathology. There was a significant indirect effect of interpersonal problems on BED symptoms and psychopathology mediated through negative affect. Interpersonal problems may lead to greater BED symptoms and psychopathology, and this relationship may be partially explained by elevated negative affect. The results of the study are the first to provide support for the interpersonal model of BED symptoms and psychopathology in a clinical sample of women. Copyright © 2015 John Wiley & Sons, Ltd and Eating Disorders Association. PMID:25582510

Ivanova, Iryna V; Tasca, Giorgio A; Hammond, Nicole; Balfour, Louise; Ritchie, Kerri; Koszycki, Diana; Bissada, Hany

2015-03-01

181

Parallel mediation effects by sleep on the parental warmth-problem behavior links: evidence from national probability samples of georgian and swiss adolescents.  

PubMed

Previous research has documented the importance of parenting on adolescent health and well-being; however, some of the underlying mechanisms that link the quality of parent-child relationship to health, adjustment, and well-being are not clearly understood. The current study seeks to address this gap by examining the extent to which sleep functioning mediates the effects by parental warmth on different measures of adolescent problem behaviors. Specifically, we test whether sleep functioning, operationalized by sleep quality and sleep quantity, mediates the relationship between the parental warmth and three measures of problem behaviors, namely alcohol use, illegal drug use, and deviance, in two nationally representative samples of Georgian (N = 6,992; M = 15.83, 60 % females, and Swiss (N = 5,575; M = 17.17, 50 % females) adolescents. Based on tests for parallel mediating effects by sleep functioning of parental warmth on problem behaviors in the MEDIATE macro in SPSS, the findings provided evidence that both sleep quality and sleep quantity independently and cumulatively mediated the effects of parental warmth on each of the three problem behaviors in both samples, with one exception. These results highlight the salience of positive parenting on sleep functioning among teens in two different cultural contexts, and, in turn, on measures of problem behaviors. PMID:25148792

Vazsonyi, Alexander T; Harris, Charlene; Terveer, Agnes M; Pagava, Karaman; Phagava, Helen; Michaud, Pierre-Andre

2015-02-01

182

[Family Involvement.  

ERIC Educational Resources Information Center

This theme issue provides four articles that address family involvement in the transition of youth with disabilities from school to work. The first article, "Family Involvement" by Marge Goldberg and Shauna McDonald, offers evidence of the importance of family involvement at this stage of the individual's life, reports on families' experiences,…

Alliance: The Newsletter of the National Transition Alliance, 1996

1996-01-01

183

Consideration of some sampling problems in the on-line analysis of batch processes by low-field NMR spectrometry.  

PubMed

A low-field medium-resolution NMR spectrometer, with an operating frequency of 29 MHz for 1H, has been assessed for on-line process analysis. A flow cell that incorporates a pre-magnetisation region has been developed to minimise the decrease in the signal owing to incomplete polarisation effects. The homogeneous esterification reaction of crotonic acid and 2-butanol was monitored using a simple sampling loop; it was possible to monitor the progression of the reaction through changes in CH signal areas of butanol and butyl crotonate. On-line analysis of heterogeneous water-toluene mixtures proved more challenging and a fast sampling loop system was devised for use with a 5 L reactor. The fast sampling loop operated at a flow rate of 8 L min(-1) and a secondary sampling loop was used to pass a sub-sample through the NMR analyser at a slower (mL min(-1)) rate. It was shown that even with super-isokinetic sampling conditions, unrepresentative sampling could occur owing to inadequate mixing in the reactor. However, it was still possible to relate the 1H NMR signal obtained at a flow rate of 60 mL min(-1) to the composition of the reactor contents. PMID:18299748

Nordon, Alison; Diez-Lazaro, Alvaro; Wong, Chris W L; McGill, Colin A; Littlejohn, David; Weerasinghe, Manori; Mamman, Danladi A; Hitchman, Michael L; Wilkie, Jacqueline

2008-03-01

184

Respondent-driven sampling to recruit young adult non-medical users of pharmaceutical opioids: Problems and solutions  

Microsoft Academic Search

Respondent-driven sampling (RDS) has been promoted as a superior method in recruiting hard-to-reach and hidden populations. Although its application has expanded enormously, there remains a need for empirical data evaluating the performance of RDS in different settings. This study describes the application of RDS to recruit a community sample (N=396) of young adults (18–23 years old) into a natural history

Raminta Daniulaityte; Russel Falck; Linna Li; Ramzi W. Nahhas; Robert G. Carlson

185

STEALTH: a Lagrange explicit finite difference code for solids, structural, and thermohydraulic analysis. Volume 2: sample and verification problems. Computer code manual. [PWR; BWR  

SciTech Connect

STEALTH sample and verification problems are presented to help users become familiar with STEALTH capabilities, input, and output. Problems are grouped into articles which are completely self-contained. The pagination in each article is A.n, where A is a unique alphabetic-character article identifier and n is a sequential page number which starts from 1 on the first page of text for each article. Articles concerning new capabilities will be added as they become available. STEALTH sample and verification calculations are divided into the following general categories: transient mechanical calculations dealing with solids; transient mechanical calculations dealing with fluids; transient thermal calculations dealing with solids; transient thermal calculations dealing with fluids; static and quasi-static calculations; and complex boundary interaction calculations.

Hofmann, R.

1982-08-01

186

Attention Problems Mediate the Association between Severity of Physical Abuse and Aggressive Behavior in a Sample of Maltreated Early Adolescents  

ERIC Educational Resources Information Center

Empirical evidence has accumulated documenting an association between childhood physical abuse and aggressive behavior. Relatively fewer studies have explored possible mediating mechanisms that may explain this association. The purpose of the current study was to examine whether caregiver- and youth-reported attention problems mediate the…

Garrido, Edward F.; Taussig, Heather N.; Culhane, Sara E.; Raviv, Tali

2011-01-01

187

Predictors and Moderators of Parent Training Efficacy in a Sample of Children with Autism Spectrum Disorders and Serious Behavioral Problems  

ERIC Educational Resources Information Center

The Research Units on Pediatric Psychopharmacology-Autism Network reported additional benefit when adding parent training (PT) to antipsychotic medication in children with autism spectrum disorders and serious behavior problems. The intent-to-treat analyses were rerun with putative predictors and moderators. The "Home Situations Questionnaire"…

Farmer, Cristan; Lecavalier, Luc; Yu, Sunkyung; Arnold, L. Eugene; McDougle, Christopher J.; Scahill, Lawrence; Handen, Benjamin; Johnson, Cynthia R.; Stigler, Kimberly A.; Bearss, Karen; Swiezy, Naomi B.; Aman, Michael G.

2012-01-01

188

The Problem Areas in Diabetes (PAID) scale: psychometric evaluation survey in a Greek sample with type 2 diabetes.  

PubMed

Several instruments have been developed for the assessment of emotional distress in patients with diabetes. The Problem Areas in Diabetes Scale (PAID) is a brief self-report scale that evaluates diabetes-related distress. There is a lack of validated instruments for the evaluation of psychological aspects in patients with diabetes in Greek language. The current study was conducted to translate and adapt the PAID scale in Greek language and to evaluate the psychometric properties in two different study populations of patients with diabetes. The aim of this study was to translate the Problem Areas in Diabetes (PAID) scale into Greek, adapt it culturally to Greece and determine its psychometric properties. The translation process included two forward translations, reconciliation, backward translation and pre-testing steps. The validation incorporated the exploration of internal consistency (Cronbach's alpha), test-retest reliability (interclass correlation coefficient), construct validity (exploratory factor analysis) and responsiveness (Spearman correlation coefficient). Participants included 101 consecutive patients from a rural primary healthcare centre and 101 patients from an urban hospital. All patients completed the PAID scale and the Short Form-36 (SF-36) version 2. Internal consistency considered good (Cronbach's alpha = 0.948). Interclass correlation coefficient was 0.942 (95% CI 0.915-0.961). Factor analysis yielded three factors: 'Diabetes-related emotional problems' (51.79% variance, Cronbach's alpha = 0.910), 'Food-related problems' (9.55% variance, Cronbach's alpha = 0.824) and 'Social support-related problems' (5.96% variance, Cronbach's alpha = 0.704). Screen plot test and conceptual congruency of items supported a three-factor solution. Total PAID showed a negative correlation with both SF-36 mental component summary (r = -0.733, P < 0.0001) and SF-36 physical component summary (r = -0.594, P < 0.0001). Our findings indicate that the Greek version of the PAID questionnaire is reliable and valid for patients with diabetes mellitus in Greece. PMID:22340071

Papathanasiou, A; Koutsovasilis, A; Shea, S; Philalithis, A; Papavasiliou, S; Melidonis, A; Lionis, C

2014-05-01

189

Problem description Methodology Research  

E-print Network

Outline Background Problem description Methodology Research New Results Updates New Results Problem description Methodology Research New Results Updates Background Problem description Calibration Samples Methodology Research Principle Component Analysis Model Building Three source parameter sampling

Wolfe, Patrick J.

190

Respondent-Driven Sampling to Recruit Young Adult Non-Medical Users of Pharmaceutical Opioids: Problems and Solutions  

PubMed Central

Respondent-driven sampling (RDS) has been promoted as a superior method in recruiting hard-to-reach and hidden populations. Although its application has expanded enormously, there remains a need for empirical data evaluating the performance of RDS in different settings. This study describes the application of RDS to recruit a community sample (N=396) of young adults (18–23 years old) into a natural history study of non-medical pharmaceutical opioid use. Since recruitment targeted non-dependent pharmaceutical opioid users, and applied other eligibility restrictions, several modifications had to be made to make RDS work with this narrowly-defined target population. RDS recruitment was less efficient than expected, and produced greater numbers of African American recruits than anticipated. Although the sampling quota was met, sample analysis revealed a lack of equilibrium in terms of ethnic composition and very strong in-group recruitment tendencies among White and African American respondents. This study contributes potentially helpful insights into the strengths and limitations of using RDS which may benefit future studies. PMID:21885213

Daniulaityte, Raminta; Falck, Russel; Li, Linna; Nahhas, Ramzi W.; Carlson, Robert G.

2011-01-01

191

Assessing Social Competence and Behavior Problems in a Sample of Italian Preschoolers Using the Social Competence and Behavior Evaluation Scale  

ERIC Educational Resources Information Center

Research Findings: The main goals of this study were to examine the factor validity of the Social Competence and Behavior Evaluation (SCBE-30) scale using exploratory factor analysis and confirmatory factor analysis and to test factor invariance across gender in a sample of Italian preschool-age children (241 boys, 252 girls). The concurrent…

Sette, Stefania; Baumgartner, Emma; MacKinnon, David P.

2015-01-01

192

Sex Differences in Childhood Sexual Abuse Characteristics and Victims' Emotional and Behavioral Problems: Findings from a National Sample of Youth  

ERIC Educational Resources Information Center

Objective: The first objective of this study was to test for sex differences in four childhood sexual abuse characteristics--penetration, substantiation, perpetrator familial status, and multi-maltreatment--in a national sample of youth. The second objective was to test for sex differences in how these abuse characteristics were associated with…

Maikovich-Fong, Andrea Kohn; Jaffee, Sara R.

2010-01-01

193

The sensitivity of CD138 immunostaining of bone marrow trephine specimens for quantifying marrow involvement in MGUS and myeloma, including samples with a low percentage of plasma cells  

Microsoft Academic Search

\\/CD138 + cells, hematoxylin and eosin trephine section examination and CD138 trephine immunohistology. The results of quantification by the different methods were compared. Compared to other methods, CD138 trephine immunohistology consistently demonstrated greater plasma-cell infiltration. Immunohistology is the most sensitive method for assessment of plasma-cell infiltration at diagnosis or post-therapy, especially in patients with minimal bone marrow involvement.

Ashley P. Ng; Andrew Wei; Dinesh Bhurani; Peter Chapple; Frank Feleppa; Surender Juneja

194

On-line sample processing involving microextraction techniques as a front-end to atomic spectrometric detection for trace metal assays: a review.  

PubMed

Within the last decade, liquid-phase microextraction (LPME) and micro-solid phase extraction (?SPE) approaches have emerged as substitutes for conventional sample processing procedures for trace metal assays within the framework of green chemistry. This review surveys the progress of the state of the art in simplification and automation of microextraction approaches by harnessing to the various generations of flow injection (FI) as a front end to atomic absorption spectrometry (AAS), atomic fluorescence spectrometry (AFS) or inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES/MS). It highlights the evolution of flow injection analysis and related techniques as vehicles for appropriate sample presentation to the detector and expedient on-line matrix separation and pre-concentration of trace levels of metals in troublesome matrices. Rather than being comprehensive this review is aimed at outlining the pros and cons via representative examples of recent attempts in automating green sample preparation procedures in an FI or sequential injection (SI) mode capitalizing on single-drop microextraction, dispersive liquid-phase microextraction and advanced sorptive materials including carbon and metal oxide nanoparticles, ion imprinted polymers, superparamagnetic nanomaterials and biological/biomass sorbents. Current challenges in the field are identified and the synergetic combination of flow analysis, nanotechnology and metal-tagged biomolecule detection is envisaged. PMID:23708278

Miró, Manuel; Hansen, Elo Harald

2013-06-11

195

Histories of Childhood Victimization and Subsequent Mental Health Problems, Substance Use, and Sexual Victimization for a Sample of Incarcerated Women in the US  

PubMed Central

Women are entering US prisons at nearly double the rate of men and are the fastest growing prison population. Current extant literature focuses on the prevalence of the incarceration of women, but few studies exist that emphasize the different trajectories to prison. For example, women prisoners have greater experiences of prior victimization, more reports of mental illness, and higher rates of illicit substance use. The purpose of this study was to understand the prevalence of childhood victimization and its association with adult mental health problems, substance abuse disorders, and further sexual victimization. The research team interviewed a random sample of 125 women prisoners soon to release from prison to gather information on their childhood physical and sexual victimization, mental health and substance abuse problems as an adult, and sexual victimization in the year preceding incarceration. Results indicate that women prisoners in this sample who were both physically and sexually victimized as a child were more likely to be hospitalized as an adult for a psychological or emotional problem. Women who were sexually victimized or both physically and sexually victimized were more likely to attempt suicide. Women who experienced physical victimization as children and women who were both physically and sexually victimized were more likely to have a substance use disorder and women who were sexually abused as children or both physically and sexually victimized were more likely to be sexually abused in the year preceding prison. This article ends with a discussion about prisons’ role in providing treatment for women prisoners and basing this treatment on women’s trajectories to prison, which disproportionately includes childhood victimization and subsequent mental health and substance use problems. PMID:23196054

Tripodi, Stephen J.; Pettus-Davis, Carrie

2012-01-01

196

Forcible, drug-facilitated, and incapacitated rape in relation to substance use problems: results from a national sample of college women.  

PubMed

This is the first study to examine the relation between rape and substance use problems in college women as a function of three legally recognized forms of rape: forcible, incapacitated, and substance-facilitated rape. Data were collected via structured telephone interview with a large national sample of college women aged 18-34 years (n=1980). Lifetime prevalence of any type of rape was 11.3% in the sample. Prevalence estimates for binge drinking and substance abuse were 15.8% and 19.8%, respectively. Lifetime experience of incapacitated rape and drug-alcohol facilitated rape, but not forcible rape, were associated with increased odds of past-year binge drinking and substance abuse. Findings have implications for secondary prevention and call for continued differentiation in assessment of rape type. PMID:19162407

McCauley, Jenna; Ruggiero, Kenneth J; Resnick, Heidi S; Conoscenti, Lauren M; Kilpatrick, Dean G

2009-05-01

197

A technical problem in the calculation of laminar flow near irregular surfaces described by sampled geometric data.  

PubMed

The numerical simulation of fluid flow and transport near biological surfaces must take into account the natural irregularity of these surfaces if the influence of the surface geometry on the near-wall flow field is to be modeled. If the geometric description of a biological surface has a limited resolution, what impact will this have on the accuracy of a computational simulation of the near-wall flow field? It is important to emphasize here that the problem arises from the limited number of data points describing the geometry and not from any limit on the number of mesh points in any subsequent calculation. In this note we show that if every point in a geometric data set describing an axisymmetric model of a diseased coronary artery is taken as a mesh point, then a well converged and otherwise accurately calculated wall shear stress distribution contains a degree of uncertainty which is attributable wholly to the limited resolution of the original geometric model. The approach taken is to repeat the numerical calculation on a reduced resolution version of the original geometric data set, comparing the wall shear stress distribution with that obtained originally. We conclude that accurate computational modeling and simulation of transport processes near irregular biological surfaces will be highly dependent on the availability of well-resolved geometric data describing the surface under study. PMID:7738055

Katz, I M; Shaughnessy, E J; Cress, B B

1995-04-01

198

Volunteer Bias in Recruitment, Retention, and Blood Sample Donation in a Randomised Controlled Trial Involving Mothers and Their Children at Six Months and Two Years: A Longitudinal Analysis  

PubMed Central

Background The vulnerability of clinical trials to volunteer bias is under-reported. Volunteer bias is systematic error due to differences between those who choose to participate in studies and those who do not. Methods and Results This paper extends the applications of the concept of volunteer bias by using data from a trial of probiotic supplementation for childhood atopy in healthy dyads to explore 1) differences between a) trial participants and aggregated data from publicly available databases b) participants and non-participants as the trial progressed 2) impact on trial findings of weighting data according to deprivation (Townsend) fifths in the sample and target populations. 1) a) Recruits (n?=?454) were less deprived than the target population, matched for area of residence and delivery dates (n?=?6,893) (mean [SD] deprivation scores 0.09[4.21] and 0.79[4.08], t?=?3.44, df?=?511, p<0.001). b) i)As the trial progressed, representation of the most deprived decreased. These participants and smokers were less likely to be retained at 6 months (n?=?430[95%]) (OR 0.29,0.13–0.67 and 0.20,0.09–0.46), and 2 years (n?=?380[84%]) (aOR 0.68,0.50–0.93 and 0.55,0.28–1.09), and consent to infant blood sample donation (n?=?220[48%]) (aOR 0.72,0.57–0.92 and 0.43,0.22–0.83). ii)Mothers interested in probiotics or research or reporting infants’ adverse events or rashes were more likely to attend research clinics and consent to skin-prick testing. Mothers participating to help children were more likely to consent to infant blood sample donation. 2) In one trial outcome, atopic eczema, the intervention had a positive effect only in the over-represented, least deprived group. Here, data weighting attenuated risk reduction from 6.9%(0.9–13.1%) to 4.6%(?1.4–+10.5%), and OR from 0.40(0.18–0.91) to 0.56(0.26–1.21). Other findings were unchanged. Conclusions Potential for volunteer bias intensified during the trial, due to non-participation of the most deprived and smokers. However, these were not the only predictors of non-participation. Data weighting quantified volunteer bias and modified one important trial outcome. Trial Registration This randomised, double blind, parallel group, placebo controlled trial is registered with the International Standard Randomised Controlled Trials Register, Number (ISRCTN) 26287422. Registered title: Probiotics in the prevention of atopy in infants and children. PMID:23874465

Jordan, Sue; Watkins, Alan; Storey, Mel; Allen, Steven J.; Brooks, Caroline J.; Garaiova, Iveta; Heaven, Martin L.; Jones, Ruth; Plummer, Sue F.; Russell, Ian T.; Thornton, Catherine A.; Morgan, Gareth

2013-01-01

199

Do adolescent drug use consequences predict externalizing and internalizing problems in emerging adulthood as well as traditional drug use measures in a Hispanic sample?  

PubMed

The present study compares statistical models for three conceptualizations of drug use in 11th grade (past 30 day ever/never use, past 30 day frequency of drug use and past 30 day drug use consequences) with externalizing and internalizing problems in emerging adulthood when controlling for age, academic achievement and socioeconomic status in a Hispanic sample. Multivariate logistic regression models for the different drug use variables were compared when modeling weapon carrying, arrest, multiple lifetime sex partners, drug/alcohol use before sex and condom use in emerging adulthood. A multivariate linear regression model was used to model depression in emerging adulthood as a function of drug use measurement controlling for other covariates and depression in adolescence. Our findings suggest that any conceptualization of drug use will produce equitable results and model fit statistics when examining externalizing problems. However, when investigating internalizing problems, such as depression, lower frequency drug use-and not high frequency-was more strongly associated with depression whereas experiencing high levels of drug use consequences-and not low levels of consequences-was associated with depression in emerging adulthood despite similar model fit values. Variation between drug use and the experience of drug use consequences may lead to misspecification of "at-risk" subgroups of drug users. Implications and future directions are discussed. PMID:24345310

Grigsby, Timothy J; Forster, Myriam; Baezconde-Garbanati, Lourdes; Soto, Daniel W; Unger, Jennifer B

2014-03-01

200

Two-stage sampling in surveys to substantiate freedom from disease  

Microsoft Academic Search

Disease in livestock populations tends to cluster at the herd level. In order to account for this—and to overcome the problems of simple random sampling from a very large population—large-scale livestock surveys usually involve two-stage sampling. However, the use of two-stage sampling presents particular problems for sample-size calculation and analysis. We developed a probability formula for two-stage sampling, initially based

Angus R. Cameron; F. Chris Baldock

1998-01-01

201

Implementation of the Bacillus cereus microbiological plate used for the screening of tetracyclines in raw milk samples with STAR protocol - the problem with false-negative results solved.  

PubMed

In antibiotic residue analyses the first step of screening is just as important as the following steps. Screening methods need to be quick and inexpensive, but above all sensitive enough to detect the antibiotic residue at or below the maximum residue limit (MRL). In the case of a positive result, the next step is conducted and further methods are used for confirmation. MRLs stated in European Union Regulation 37/2010 for tetracyclines in raw milk are: 100 µg kg(-1) for tetracycline, 100 µg kg(-1) for oxytetracycline, 100 µg kg(-1) for chlortetracycline and no limit for doxycycline because it is prohibited for use in animals from which milk is produced for human consumption. The current five-plate microbiological screening method for the detection of antibiotic residues in raw milk was found to be simple and inexpensive, but not specific, sensitive and reliable enough to detect tetracycline at MRL in routine raw milk screening procedures. Spiking samples with tetracycline at the MRL level and applying them on Bacillus cereus ATCC 11778 microbiological plates often gave false-negative results, indicating that tetracyclines may have to be inactivated or masked. Tetracyclines seem to bind to a certain component in milk. Consequently, when applying samples to the B. cereus microbiological plate the antibiotic cannot inhibit the growth of B. cereus which disables the formation of inhibition zones on the test plate. After adding the appropriate amount of citric acid into the milk samples, we solved the problem of false-negative results. During the validation 79 samples of milk were spiked with tetracyclines at different concentrations: 100 µg kg(-1) for tetracycline, 100 µg kg(-1) for oxytetracycline, 80 µg kg(-1) for chlortetracycline and 30 µg kg(-1) for doxycycline. Concentrations used in the validation matched the requirements for MRLs (they were either at or below the MRLs) stated in European Union Regulation 37/2010. The sensitivity of the validation was 100%. PMID:25230820

Raspor Lainš?ek, P; Biasizzo, M; Henigman, U; Dolenc, J; Kirbiš, A

2014-01-01

202

Problem description Methodology Research  

E-print Network

Outline Background Problem description Methodology Research New Results Two concerns New Results Problem description Methodology Research New Results Two concerns Background Problem description Calibration Samples Methodology Research Principle Component Analysis Model Building Three source parameter

Wolfe, Patrick J.

203

Psychometric Properties, Norms, and Factor Structure of the Diabetes Eating Problem Survey–Revised in a Large Sample of Children and Adolescents With Type 1 Diabetes  

PubMed Central

OBJECTIVE The purpose of this study was to examine the psychometric properties of the Diabetes Eating Problem Survey–Revised (DEPS-R) in a large sample of young patients with type 1 diabetes, to establish norms, and to validate it against the Eating Attitudes Test–12 (EAT-12). RESEARCH DESIGN AND METHODS A total of 770 children and adolescents aged 11–19 years with type 1 diabetes completed the DEPS-R and the EAT-12. In addition, age- and sex-standardized BMI and HbA1c data were obtained from the Norwegian Childhood Diabetes Registry. In addition to tests of validity, principal axis factoring was conducted to investigate the factor structure of the 16-item DEPS-R. RESULTS The DEPS-R demonstrated satisfactory Cronbach ? (0.89) and was significantly correlated with the EAT-12 (0.65; P < 0.01), indicating convergent validity. The mean (SD) DEPS-R scores were 11.0 (10.7) for the total sample and 7.7 (7.4) and 14.2 (2.4) for males and females, respectively. CONCLUSIONS This study replicates and extends previous research demonstrating the psychometric properties of the abbreviated 16-item DEPS-R. Findings support the utility of this important screening tool to identify disturbed eating in young patients with type 1 diabetes. PMID:23536586

Wisting, Line; Frøisland, Dag Helge; Skrivarhaug, Torild; Dahl-Jørgensen, Knut; Rø, Øyvind

2013-01-01

204

Four Problems About Self-Locating Belief Introduction  

E-print Network

by drawing on the analogy between the four problems. Part 1: Selection Effects and Self-Location 1 effect. Eddington's (1939) classic example involves fishing with a net1 . If we catch a sample of fish from a lake, and all the fish in the sample are bigger than six inches, this appears to confirm

Fitelson, Branden

205

The relations among cumulative risk, parenting, and behavior problems during early childhood  

Microsoft Academic Search

Background: This study examined relations among cumulative risk, nurturant and involved parenting, and behavior problems across early childhood. Methods: Cumulative risk, parenting, and behavior problems were measured in a sample of low-income toddlers participating in a family-centered program to prevent conduct problems. Results: Path analysis was utilized to examine longitudinal relations among these constructs, with results supporting an indirect effect

Christopher J. Trentacosta; Luke W. Hyde; Daniel S. Shaw; Thomas J. Dishion; Frances Gardner; Melvin Wilson

2008-01-01

206

Civic Involvement Survey, 1997  

NSDL National Science Digital Library

In March 2001, the American Religion Data Archive posted data "on the level and types of civic involvement of a nationally representative sample of American adults. Extensive questions about respondents' religious activities and beliefs are also included in the survey." In addition to the data's description, users can view the codebook, download the data, and search or analyze the data. Download options include ExplorIt Software, MicroCase 4.0, SPSS portable file, and ASCII.

2001-01-01

207

Problems with "n"th-Term Problems  

ERIC Educational Resources Information Center

An nth-term problem involves a sequence. Students must determine which expression will allow them to calculate the nth position of the sequence. To solve such problems, students are to find "a rule that determines the number of elements in a step from the step number." These types of problems help students develop concepts of functions, variables,…

Matteson, Shirley M.

2010-01-01

208

Musculoskeletal involvement in sarcoidosis.  

PubMed

Sarcoidosis is a multisystem inflammatory disorder of unknown cause. It most commonly affects the pulmonary system but can also affect the musculoskeletal system, albeit less frequently. In patients with sarcoidosis, rheumatic involvement is polymorphic. It can be the presenting symptom of the disease or can appear during its progression. Articular involvement is dominated by nonspecific arthralgia, polyarthritis, and Löfgren's syndrome, which is defined as the presence of lung adenopathy, arthralgia (or arthritis), and erythema nodosum. Skeletal manifestations, especially dactylitis, appear mainly as complications of chronic, multiorgan sarcoidosis. Muscle involvement in sarcoidosis is rare and usually asymptomatic. The diagnosis of rheumatic sarcoidosis is based on X-ray findings and magnetic resonance imaging findings, although the definitive diagnosis is made by anatomopathological study of biopsy samples. Musculoskeletal involvement in sarcoidosis is generally relieved with nonsteroidal anti-inflammatory drugs or corticosteroids. In corticosteroid-resistant or -dependent forms of the disease, immunosuppressive therapy, such as treatment with methotrexate or anti-TNF-?, is employed. The aim of this review was to present an overview of the various types of osteoarticular and muscle involvement in sarcoidosis, focusing on their diagnosis and management. PMID:24831403

Nessrine, Akasbi; Zahra, Abourazzak Fatima; Taoufik, Harzy

2014-01-01

209

Sport involvement, sport violence and health behaviours of Greek adolescents  

Microsoft Academic Search

Background: Within the context of problem-behaviour theory, this study investigated the intra-relationship between attitudes and behaviours towards exercise, sport involvement, violence in sport-related events, eating fruits, smoking and hashish or ecstasy use in a sample of Greek adolescents. Age and gender patterns are considered. Methods: Participants were 5991 Greek school pupils who responded to questionnaires assessing behaviour and attitudes towards

ATHANASIOS PAPAIOANNOU; CALLIOPE KARASTOGIANNIDOU; YANNIS THEODORAKIS

2004-01-01

210

Different stability of social-communication problems and negative demanding behaviour from infancy to toddlerhood in a large Dutch population sample  

PubMed Central

Background Little is known about the stability of behavioural and developmental problems as children develop from infants to toddlers in the general population. Therefore, we investigated behavioural profiles at two time points and determined whether behaviours are stable during early development. Methods Parents of 4,237 children completed questionnaires with 62 items about externalizing, internalizing, and social-communicative behaviour when the children were 14–15 and 36–37 months old. Factor mixture modelling identified five homogeneous profiles at both time points: three with relatively normal behaviour or with mild/moderate problems, one with clear communication and interaction problems, and another with pronounced negative and demanding behaviour. Results More than 85% of infants with normal behaviour or mild problems at 14–15 months were reported to behave relatively typically as toddlers at 36–37 months. A similar percentage of infants with moderate communication problems outgrew their problems by the time they were toddlers. However, infants with severe problems had mild to severe problems as toddlers, and did not show completely normal behaviour. Improvement over time occurred more often in children with negative and demanding behaviour than in children with communication and interaction problems. The former showed less homotypic continuity than the latter. Conclusions Negative and demanding behaviour is more often transient and a less specific predictor of problems in toddlerhood than communication and interaction problems. PMID:25061477

2014-01-01

211

Conversion Word Problems  

NSDL National Science Digital Library

This ready-to-print work sheet presents students with three problems, and in order to solve them, students must convert between smaller and larger units and use all four mathematical operations. There are a total of seven questions involving these three problems, and the conversions which students must undertake involve dollars and cents, pounds and ounces, grams and kilograms, and centimeters and meters.

2010-08-04

212

Sex Differences in the Reciprocal Relationships between Mild and Severe Corporal Punishment and Children's Internalizing Problem Behavior in a Chinese Sample  

ERIC Educational Resources Information Center

The study aimed to investigate the sex differences in the reciprocal relations between parental corporal punishment and child internalizing problem behavior in China. Four hundred fifty-four Chinese elementary school-age children completed measures of their parental corporal punishment toward them and their own internalizing problem behavior at…

Xing, Xiaopei; Wang, Meifang

2013-01-01

213

A cross-sectional analysis of women’s mental health problems: examining the association with different types of violence among a sample of Brazilian mothers  

PubMed Central

Background Mental health problems are the major cause of disability in poor countries, and women are the individuals most affected. The World Health Organization points out that violence against women is the leading cause of mental health problems. This study seeks to identify explanatory factors for women’s mental health problems, highlighting situations of violence suffered by them during childhood, when living with a partner and in the community. Method A cross-sectional analysis was conducted with 389 mothers with schoolchildren in a city in the state of Rio de Janeiro (Brazil). Profile variables and childhood and adult life experiences were researched and organized in three analytical blocks. A binary logistic regression model was used, divided into hierarchical blocks. Results The final model shows that women who were the victims of severe physical violence by their partner were more likely (OR?=?8.2) to suffer from mental health problems than those who had never been exposed to this type of violence. The mothers of children with behavior problems are more likely to have mental health problems (OR?=?3.0) than mothers whose children do not manifest behavioral problems. Conclusion This study shows that women’s mental health problems are particularly related to the experience of physical violence, especially that occurring in intimate partner relationships. Based on this premise, this work recommends that multidimensional issues need to be included in women’s health assistance programs duly incorporating the specificity of victimization by violence. PMID:23587110

2013-01-01

214

Organized Activity Involvement among Rural Youth: Gender Differences in Associations between Activity Type and Developmental Outcomes  

ERIC Educational Resources Information Center

The current study examined associations between organized activity involvement, academic achievement, and problem behavior in a sample of youth from a non-agricultural based rural community (M[subscript age] = 15.26, Age range = 11-19 years, N = 456). Analyses examined whether associations varied as a function of adolescent gender and age.…

Ferris, Kaitlyn A.; Oosterhoff, Benjamin; Metzger, Aaron

2013-01-01

215

Verifying Hybrid Systems Involving Transcendental Functions  

E-print Network

Verifying Hybrid Systems Involving Transcendental Functions Paul Jackson1 , Andrew Sogokon1 , JamesTarski proof en- gine for problems involving special functions such as sin, cos, exp, etc. Transcendental between KeYmaera and external tools have involved polynomi- als over the reals, but not transcendental

Jackson, Paul

216

Sampling Development  

PubMed Central

Research in developmental psychology requires sampling at different time points. Accurate depictions of developmental change provide a foundation for further empirical studies and theories about developmental mechanisms. However, overreliance on widely spaced sampling intervals in cross-sectional and longitudinal designs threatens the validity of the enterprise. This article discusses how to sample development in order to accurately discern the shape of developmental change. The ideal solution is daunting: to summarize behavior over 24-hour intervals and collect daily samples over the critical periods of change. We discuss the magnitude of errors due to undersampling, and the risks associated with oversampling. When daily sampling is not feasible, we offer suggestions for sampling methods that can provide preliminary reference points and provisional sketches of the general shape of a developmental trajectory. Denser sampling then can be applied strategically during periods of enhanced variability, inflections in the rate of developmental change, or in relation to key events or processes that may affect the course of change. Despite the challenges of dense repeated sampling, researchers must take seriously the problem of sampling on a developmental time scale if we are to know the true shape of developmental change. PMID:22140355

Adolph, Karen E.; Robinson, Scott R.

2011-01-01

217

Petrographic Problem Solving Assignments  

NSDL National Science Digital Library

Petrographic problem-solving (PPS) assignments consist of a series of two-week mini-projects used within the context of an undergraduate petrology course. The central idea behind PPS assignments is for students to use thin sections as a geologic data source for conducting authentic scientific investigations. For each assignment, students are provided a thin section and corresponding hand sample. Drawing from their initial observations and foundation knowledge, students identify a scientific question, propose a working hypothesis to explain it, test the hypothesis using observations and data collected from the sample, and defend their results in oral presentations and written reports. They use digital cameras interfaced with microscopes to acquire photomicrographs and various software applications to collect and analyze data. For each assignment, students prepare a two-page paper and give a brief presentation to the class (5-10 minutes in duration with 3-5 minutes for discussion). During the presentation sessions, which each require a two-hour class period, class members are encouraged to question their student colleagues. Students are introduced to PPS assignments as part of the take-home final in the prerequisite Microscopy course. Three PPS assignments are in turn engaged in the subsequent Petrology course during the 10-week term. A summative take-home PPS exercise is completed as part of the final exam. In Petrology, PPS assignments augment more traditional laboratory exercises and are specifically aligned with course content, as follows (refer to student handout sheets in supplemental materials section). Using a set of rocks representing distinct lithologies, students are guided to think about what geologic conditions and/or environment the sample formed in. Using a set of plutonic and volcanic rocks from a description and classification exercise, students define their own geologic problem. Using a set of metamorphic rocks, students are instructed to interpret the genetic conditions based on textures and/or mineralogy. Using several different andesite samples, students are directed to consider the origin of the sample in context of a case-study activity conducted during the term. This PPS assignment is completed as part of the final exam and requires a summative two-page paper. In the context of a broad-based undergraduate Earth Science degree program, PPS assignments engage students in the study of Earth materials, actively involve them in the scientific process, and emphasize creative problem solving rather than factual recall.

Templeton, Jeffrey

218

The Importance of Reference Gene Analysis of Formalin-Fixed, Paraffin-Embedded Samples from Sarcoma Patients — An Often Underestimated Problem12  

PubMed Central

Objective: Reverse transcription quantitative real-time polymerase chain reaction is efficient for quantification of gene expression, but the choice of reference genes is of paramount importance as it is essential for correct interpretation of data. This is complicated by the fact that the materials often available are routinely collected formalin-fixed, paraffin-embedded (FFPE) samples in which the mRNA is known to be highly degraded. The purpose of this study was to investigate 22 potential reference genes in sarcoma FFPE samples and to study the variation in expression level within different samples taken from the same tumor and between different histologic types. Methods: Twenty-nine patients treated for sarcoma were enrolled. The samples encompassed 82 (FFPE) specimens. Extraction of total RNA from 7-?m FFPE sections was performed using a fully automated, bead-base RNA isolation procedure, and 22 potential reference genes were analyzed by reverse transcription quantitative real-time polymerase chain reaction. The stability of the genes was analyzed by RealTime Statminer. The intrasamples variation and the interclass correlation coefficients were calculated. The linear regression model was used to calculate the degradation of the mRNA over time. Results: The quality of RNA was sufficient for analysis in 84% of the samples. Recommended reference genes differed with histologic types. However, PPIA, SF3A1, and MRPL19 were stably expressed regardless of the histologic type included. The variation in ?Cq value for samples from the same patients was similar to the variation between patients. It was possible to compensate for the time-dependent degradation of the mRNA when normalization was made using the selected reference genes. Conclusion: PPIA, SF3A1, and MRPL19 are suitable reference genes for normalization in gene expression studies of FFPE samples from sarcoma regardless of the histology. PMID:25500077

Aggerholm-Pedersen, Ninna; Safwat, Akmal; Bærentzen, Steen; Nordsmark, Marianne; Nielsen, Ole Steen; Alsner, Jan; Sørensen, Brita S.

2014-01-01

219

A Quantitative Genetic Analysis of the Associations among Language Skills, Peer Interactions, and Behavioral Problems in Childhood: Results from a Sample of Twins  

ERIC Educational Resources Information Center

A body of empirical research has revealed that there are associations among language skills, peer interactions, and behavioral problems in childhood. At the same time, however, there has been comparatively less research devoted to exploring the mutual unfolding of these factors over the first few years of life. The current study is designed to…

Beaver, Kevin M.; Boutwell, Brian B.; Barnes, J. C.; Schwartz, Joseph A.; Connolly, Eric J.

2014-01-01

220

Sample Exam Problems/MA 214, Spring 2012 The first midterm exam takes place February 10, Friday (1:00-2:00pm).  

E-print Network

problmes that you can practise. The topics that you need to review include: (1) How to solve first order linear ODE? (2) How to solve first order separable ODE? (3) How to check a first order ODE is exact models? (1) Find the solution to the initial value problem of the differential equation: y + 2 t y = 1

Wang, Changyou

221

An epidemiologic longitudinal study of sleeping problems and feeding experience of preterm and term children in southern Finland: Comparison with a southern German population sample  

Microsoft Academic Search

Objective: To determine the influence of breast-feeding on the prevalence and persistence of sleeping problems in southern Finland (SF) and southern Germany (SG). Design: Prospective binational population study of infants admitted to special care units (SCUs) in geographically defined areas in SF and SG. Subjects: In SF, the number of SCU infants was 1057 (very preterm, 47; preterm, 258; term,

Dieter Wolke; Brigitte Söhne; Klaus Riegel; Barbara Ohrt; Kalle Österlund

1998-01-01

222

ADHD and Other Associated Developmental Problems in Children with Mild Mental Retardation. The Use of the "Five-To-Fifteen" Questionnaire in a Population-Based Sample  

ERIC Educational Resources Information Center

The aim was to examine the rates and types of parent reported neuropsychiatric problems in children and adolescents with mild mental retardation (MMR) (mild intellectual disability/UK) using the Five-To-Fifteen questionnaire (FTF). The target group comprised all pupils with clinically diagnosed MMR, aged between 7 and 15 years, attending the…

Lindblad, Ida; Gillberg, Christopher; Fernell, Elisabeth

2011-01-01

223

Educational Inequalities in the Co- occurrence of Mental Health and Substance Use Problems, and its Adult Socioeconomic Consequences: A Longitudinal Study of Young Adults in a Community Sample  

PubMed Central

Objectives To examine the relationship between the co-occurrence of mental health and substance use problems and socioeconomic status (SES). Study design A prospective longitudinal study of 808 males and females followed to age 30. Methods Survey data were used to derive latent classes (profiles) of mental health (depression, anxiety) and substance use (alcohol, nicotine, and marijuana [cannabis]) problems at age 27. Analyses examined the associations of these profiles with earlier educational attainment (high school diploma) and indicators of SES at age 30. Results Latent Class Analysis produced four profiles: a low disorder symptoms group, a licit substance use disorder symptoms group (alcohol and nicotine), a mental health disorder symptoms group, and a comorbid group. Earning a high school diploma by age 21 decreased the odds of belonging to the comorbid group or the licit substance use disorder symptoms group when compared to the low disorder symptoms group. These disorder profiles also were found to adversely impact subsequent adult SES. The adverse impact was more evident in income maintenance and wealth accumulation by age 30 than market or nonmarket labor force participation. Conclusions Earning a high school diploma lessens the risk of co-occurring mental health and substance use problems which contribute to economic instability in young adulthood. Findings underscore the importance of public health programs to reduce the incidence of mental health and substance use problems and their associated high costs to individuals and to society. PMID:23870846

Lee, Jungeun Olivia; Herrenkohl, Todd I.; Kosterman, Rick; Small, Candice M.; Hawkins, J. David

2013-01-01

224

Sample Problems for the Midterm The exam is on Tuesday, 02/11, 2:10 pm 3:30 pm.  

E-print Network

the solutions of the given problem: (1) y - 2y = 0. (2) y = xy x2-1 . (3) 3y + 2xy2 = 0, y(0) = 1. (4) xyy = (y2 homogeneous equations: (1) y = x2 +2xy+y2 x2 . (2) y = y-x x . (3) y = x2 +y2 2xy . 6. Use integrating factor

Guan, Daniel (Zhuang-dan)

225

Sample Problems for the Midterm The exam is on Friday, 02/19, 3:10 pm 4:00 pm.  

E-print Network

) y sin x + y cos x = 1. (3) xyy = (y2 - 1)2 . (4) (x2 + y2 )dx + 2xydy = 0. (5) (3x + 2y2 )dx + 2xydy = 0. (6) y = x2 +2xy+y2 x2 . (7) y + y = xy2 . 3. Solve the following initial value problems: (1) y

Guan, Daniel (Zhuang-dan)

226

Sample Problems for the Midterm The exam is on Tuesday, 05/06, 9:40 am 11:00 am.  

E-print Network

the solutions of the given problem: (1) y - 2y = 0. (2) y = xy x2-1 . (3) 3y + 2xy2 = 0, y(0) = 1. (4) xyy = (y2 homogeneous equations: (1) y = x2 +2xy+y2 x2 . (2) y = y-x x . (3) y = x2 +y2 2xy . 6. Use integrating factor

Guan, Daniel (Zhuang-dan)

227

Sample Problems for the Midterm The exam is on Thursday, 02/16, 2:10 pm 3:30 pm.  

E-print Network

the solutions of the given problem: (1) y - 2y = 0. (2) y = xy x2-1 . (3) 3y + 2xy2 = 0, y(0) = 1. (4) xyy = (y2 homogeneous equations: (1) y = x2 +2xy+y2 x2 . (2) y = y-x x . (3) y = x2 +y2 2xy . 6. Use integrating factor

Guan, Daniel (Zhuang-dan)

228

Physics 229 Lecture 1 Appendix B 1 Spring 2008 Lecture 1 Appendix B: Some sample problems related to Chapter 1 in K & B  

E-print Network

's consider motion and revisit that old favorite the inclined plane problem. A mass sits on a plane inclined perpendicular ( x ) to the inclined plane (we are still trying to be smart and lazy!). Since the mass is not accelerating in a direction perpendicular to the inclined plane, we have 0 cos cos .mx N mg N mg From

Ellis, Steve

229

Drug and Alcohol Use Among Homeless Older AdultsPredictors of Reported Current and Lifetime Substance Misuse Problems in a National Sample  

Microsoft Academic Search

Using data from the National Survey of Homeless Assistance Providers and Clients (NSHAPC), predictors of current alcohol and drug misuse problems among homeless, previously homeless, and marginally housed older adults are identified. Childhood sexual assault, victimization, and neglect, being male, being younger, being homeless or previously homeless, being a minority, and having income below US$499 per month increased the odds

Tracy L. Dietz

2009-01-01

230

Chorionic villus sampling  

MedlinePLUS

Chorionic villus sampling (CVS) is a test done on some pregnant women. The test is done to screen your baby for ... 10 to 12 weeks of pregnancy. Chorionic villus sampling does not detect: Neural tube defects (these involve ...

231

Gender differences in the relationship between gambling problems and the incidence of substance-use disorders in a nationally representative population sample  

PubMed Central

Background Cross-sectional studies have demonstrated gender-related differences in the associations between problem-gambling severity and substance-use disorders; however, these associations have not been examined longitudinally. We aimed to examine the prospective associations between problem-gambling severity and incident substance-use disorders in women versus men. Methods Analyses were conducted using Wave-1 and Wave-2 NESARC data focusing on psychiatric diagnoses from 34,006 non-institutionalized US adults. Inclusionary criteria for pathological gambling were used to categorize Wave-1 participants as at-risk/problem gambling (ARPG) and non-ARPG (i.e. non-gambling/low-frequency gambling/low-risk gambling). Dependent variables included the three-year incidence of any substance-use disorder, alcohol-use disorders, nicotine dependence, drug-use disorders, prescription drug-use disorders, and illicit drug-use disorders. Results Significant gender-by-ARPG status interactions were observed with respect to the three-year incidence of nicotine dependence and prescription drug-use disorders, and approached significance with respect to incident alcohol-use disorders. ARPG (relative to non-ARPG) was positively associated with nicotine dependence among women (OR=2.00; 95% CI=1.24-3.00). ARPG was negatively associated with incident prescription drug-use disorders among men (OR=0.30; 95% CI=0.10-0.88)). Finally, ARPG was positively associated with incident alcohol-use disorders among men (OR=2.20; 95% CI=1.39-3.48). Conclusions Gambling problems were associated with an increased 3-year incidence of nicotine dependence in women and alcohol dependence in men. These findings highlight the importance of considering gender in prevention and treatment initiatives for adults who are experiencing gambling problems. Moreover, the specific factors underlying the differential progressions of specific substance-use disorders in women and men with ARPG warrant identification. PMID:23755930

Pilver, Corey E.; Libby, Daniel J.; Hoff, Rani A.; Potenza, Marc N.

2013-01-01

232

The Relationship between Post-Traumatic Stress Symptoms and Substance Use among Adolescents Involved with Child Welfare: Implications for Emerging Adulthood  

ERIC Educational Resources Information Center

The purpose of the present study was to examine the role of posttraumatic stress symptoms (PTSS) in predicting substance use and substance-related problems in a sample of older youth and emerging adults involved with child welfare. The sample was drawn from the Maltreatment and Adolescent Pathways (MAP) longitudinal study (Wekerle et al. 2009).…

Goldstein, Abby L.; Wekerle, Christine; Tonmyr, Lil; Thornton, Tiffany; Waechter, Randall; Pereira, Jessica; Chung, Ronald

2011-01-01

233

Nadaraya-Watson estimator for sensor fusion problems  

SciTech Connect

The classical Nadaraya-Watson estimator is shown to solve a generic sensor fusion problem where the underlying sensor error densities are not known but a sample is available. By employing Haar kernels this estimator is shown to yield finite sample guarantees and also to be efficiently computable. Two simulation examples, and a robotics example involving the detection of a door using arrays of ultrasonic and infrared sensors, are presented to illustrate the performance.

Rao, N.S.V.

1996-10-01

234

Math 466 -Practice Problems for Exam 2 1. Suppose that X1, . . . , Xn for a random sample from a uniform distri-  

E-print Network

. The NRA claims that 40% of the US adult population is opposed to gun control legislation. To test battery has a mean of µ and a standard deviation of . (a) Suppose the population mean µ is 4.3 and the population standard deviation is 4.8. The lifetimes of a sample of n batteries are found. The probability

Watkins, Joseph C.

235

Screening for intellectual disability in persons with a substance abuse problem: Exploring the validity of the Hayes Ability Screening Index in a Dutch-speaking sample.  

PubMed

There is an increasing interest in screening instruments to detect intellectual disability (ID) in a quick and accurate way in mental health services as well as in the criminal justice system in order to provide appropriate support for people with undetected needs caused by ID. An instrument that has been proven to be useful in both settings is the Hayes Ability Screening Index (HASI). This study assessed the validity of the Dutch version of the HASI in persons with a substance abuse problem residing in mental health services, whether or not mandated to treatment by court order. The HASI was conducted along with the Wechsler Adult Intelligence Scale III as the criterion for validity to 90 participants. Additionally, the influence of psychiatric disorder and medication use on the HASI result was examined. A significant positive relationship was found between the two instruments, demonstrating convergent validity. Using a Receiver Operating Characteristic (ROC) curve analysis, the discriminative ability of the HASI with a cut-off score of 85 was found to be adequate, yielding in a good balance between sensitivity and specificity. The HASI was not distorted by the presence of the substance abuse problem or other psychiatric illnesses and medication did not influence the HASI scores in this study. These findings indicate that the HASI provides a time-efficient and resource-conscious way to detect ID in persons with a substance problem, thus addressing a critical need in mental health settings. PMID:25462510

To, Wing Ting; Vanheule, Stijn; Vanderplasschen, Wouter; Audenaert, Kurt; Vandevelde, Stijn

2014-11-12

236

Fibonacci's Triangle: A Vehicle for Problem Solving.  

ERIC Educational Resources Information Center

A method for solving certain types of problems is illustrated by problems related to Fibonacci's triangle. The method involves pattern recognition, generalizing, algebraic manipulation, and mathematical induction. (MP)

Ouellette, Hugh

1979-01-01

237

School Parent Involvement Policy  

ERIC Educational Resources Information Center

This school parent involvement policy is divided into three sections: (1) Development and Adoption of the Parent Involvement Policy; (2) Contents of the Parent Involvement Policy; and (3) Distributing and Revising the School's Parent Involvement Policy. This paper presents the provision of the Section 1118 of Title I of the No Child Left Behind…

Center for Law and Education (NJ3), 2005

2005-01-01

238

Diverse sampling of streaming data  

E-print Network

This thesis addresses the problem of diverse sampling as a dispersion problem and proposes solutions that are optimized for large streaming data. Finding the optimal solution to the dispersion problem is NP-hard. Therefore, ...

Turmukhametova, Aizana

2013-01-01

239

32 CFR 651.36 - Public involvement.  

Code of Federal Regulations, 2010 CFR

...organizations, and individuals in the development of EAs and EISs enhances collaborative issue identification and problem solving. Such involvement demonstrates that the Army is committed to open decision-making and builds the necessary...

2010-07-01

240

The sensitivity of CD138 immunostaining of bone marrow trephine specimens for quantifying marrow involvement in MGUS and myeloma,including samples with a low percentage of plasma cells .  

E-print Network

??Accurate quantification of plasma cells in bone marrow samples is essential for the diagnosis, classification and prognosis of plasma-cell dyscrasias. Published comparisons between aspirate/trephine morphology,… (more)

Ng, Ashley P

2006-01-01

241

Factors Associated with Time to Identify Physical Problems of Nursing Home Residents with Dementia  

PubMed Central

This study describes new problems emerging over six weeks for nursing home residents with advanced dementia and factors associated with time to identify the problems. The sample of 65 developed 149 new acute problems or exacerbations of existing conditions over the six weeks of data collection. The majority of these problems involved uncontrolled pain, new infections and severe psychoses. Nurse assessment skill was associated with a shorter time to identify the new problem and more time spent on the problem. A higher ratio of new to existing interventions was also associated with a shorter time to identify the problem. Other patient characteristics associated with time to identify problems included non-specific vocalizations, physical signs, cognitive status and length of stay. While future research is warranted, findings from this study highlight the frequency of problems requiring treatment and suggest that improved assessment of residents may decrease the time to identify new problems. PMID:20237337

Kovach, Christine R.; Logan, Brent R.; Simpson, Michelle R.; Reynolds, Sheila

2010-01-01

242

Stoke's Law Problem Set  

NSDL National Science Digital Library

This is a problem set that involves the calculation of velocities from a Reynolds number, determination of Stoke's Law applicability, and calculation of settling velocities for a variety of grain sizes and materials. This can be used in conjunction with a lab but is itself just a problem set.

Rachel Headley

243

Identifying viable "need-solution pairs": Problem solving without problem formulation  

E-print Network

Problem-solving research, and formal problem-solving practice as well, begins with the assumption that a problem has been identified or formulated for solving. The problem-solving process then involves a search for a ...

von Hippel, Eric A.

2013-11-27

244

Parenting factors, social skills, and value commitments as precursors to school failure, involvement with deviant peers, and delinquent behavior  

Microsoft Academic Search

Elements of social control theory were combined with social learning theory to construct a model of delinquency which specifies the manner in which parenting factors, social skills, value commitments, and problems in school contribute to association with deviant peers and involvement in delinquent behavior. The model was tested using a sample of 61 families, each of which included a seventh

Ronald L. Simons; Les B. Whitbeck; Rand D. Conger; Katherine J. Conger

1991-01-01

245

Effects of Family Involvement on Length of Stay and Treatment Completion Rates with Cocaine and Alcohol Abusers  

Microsoft Academic Search

Substance abuse is a problem of national concern. This study sought to replicate and further develop findings from a previous study that found cocaine abusers continued in and completed treatment less frequently than alcohol abusers, and that family involvement may influence continuation in and completion of treatment for both cocaine and alcohol abusers.A sample of 99 primary cocaine abusers and

Deni Carise

2000-01-01

246

Balance Problems  

MedlinePLUS

... often, it could be a sign of a balance problem. Balance problems can make you feel unsteady or as ... fall-related injuries, such as hip fracture. Some balance problems are due to problems in the inner ...

247

Involving Latino Parents.  

ERIC Educational Resources Information Center

Describes barriers to Latino parent involvement in educational activities, factors to consider when involving Latino parents, and two examples of Latino involvement programs in California: Family Literacy Workshop at James Monroe Elementary School, Madera Unified School District, and Parents Take P.A.R.T. (Parent Assisted Reading Training) at…

Quezada, Reyes L.; Diaz, Delia M.; Sanchez, Maria

2003-01-01

248

Job Involvement: A Construct Validity Study.  

ERIC Educational Resources Information Center

The interrelationships among job involvement, values, personal background, participation in decision making, and job attitudes were investigated by questionnaire for a sample of 2,775 employees of six manufacturing organizations, representing a 66 percent response rate. The results of this study indicated that job involvement, a basic orientation…

Ruh, Robert A.; White, J. Kenneth

249

IMAGE: Weekly Problem Archive  

NSDL National Science Digital Library

This is the Image for Magnetopause-to-Auroral Global Exploration (IMAGE) archive of weekly math, science, reading and art problems. New problems involving near-Earth space technology are emailed to participating teachers each week on Tuesday. The problems can be used in related lessons or as extra credit assignments. This web page is part of the outreach program of the IMAGE Satellite team to give teachers and students the latest information about aurora and the study of Earth's magnetic field, along with many programs that IMAGE has developed or participated in with NASA. A pdf document of extra credit problems is also available at this site.

Sten Odenwald

250

Macrodystrophia lipomatosa of foot involving great toe.  

PubMed

Macrodystrophia lipomatosa is a rare form of congenital disorder in which there is localized gigantism characterized by progressive overgrowth of all mesenchymal elements with a disproportionate increase in the fibroadipose tissues. The adipose tissue infiltration involves subcutaneous tissue, periosteum, nerves and bone marrow. Most of the cases reported have hand or foot involvement. Patient seeks medical help for improving cosmesis or to get the size of the involved part reduced in order to reduce mechanical problems. We report a case of macrodystrophia lipomatosa involving medial side of foot with significant enlargement of great toe causing concern for cosmesis and inconvenience due to mechanical problems. The X-rays showed increased soft tissue with more of adipose tissue and increased size of involved digits with widening of ends. Since the patient's mother did not want any surgical intervention he was educated about foot care and proper footwear design was suggested. PMID:24703060

Gaur, A K; Mhambre, A S; Popalwar, H; Sharma, R

2014-06-01

251

Sampling SIM: Sampling Distributions  

NSDL National Science Digital Library

Created by authors Beth Chance, Bob delMas and Joan Garfield, this webpage provides instructions for teaching sampling distributions using Sampling SIM software. It includes information regarding prerequisite knowledge, common misconceptions, and objectives, as well as links to an activity and a pre/post-test. This is a fairly comprehensive overview of the tools need for sampling distributions. The eight part structure employed by the authors is quite useful in assessing students knowledge gained through this activity.

Chance, Beth; Delmas, Bob; Garfield, Joan

2009-03-16

252

Pragmatic soil survey design using flexible Latin hypercube sampling  

NASA Astrophysics Data System (ADS)

We review and give a practical example of Latin hypercube sampling in soil science using an approach we call flexible Latin hypercube sampling. Recent studies of soil properties in large and remote regions have highlighted problems with the conventional Latin hypercube sampling approach. It is often impractical to travel far from tracks and roads to collect samples, and survey planning should recognise this fact. Another problem is how to handle target sites that, for whatever reason, are impractical to sample - should one just move on to the next target or choose something in the locality that is accessible? Working within a Latin hypercube that spans the covariate space, selecting an alternative site is hard to do optimally. We propose flexible Latin hypercube sampling as a means of avoiding these problems. Flexible Latin hypercube sampling involves simulated annealing for optimally selecting accessible sites from a region. The sampling protocol also produces an ordered list of alternative sites close to the primary target site, should the primary target site prove inaccessible. We highlight the use of this design through a broad-scale sampling exercise in the Burdekin catchment of north Queensland, Australia. We highlight the robustness of our design through a simulation study where up to 50% of target sites may be inaccessible.

Clifford, David; Payne, James E.; Pringle, M. J.; Searle, Ross; Butler, Nathan

2014-06-01

253

Genes Involved in Atherosclerosis  

Microsoft Academic Search

Atherosclerosis is a multifactorial disease that involves several genes and proteins. The purpose of this article is to focus on the arterial wall and to review lipoprotein receptors, growth factors, cytokines, chemokines, matrix metalloproteinases, adhesion molecules, and apoptosis genes and their involvement in atherogenesis.

Johanna Laukkanen; Seppo Ylä-Herttuala

2002-01-01

254

Commericial Involvement in Intramurals.  

ERIC Educational Resources Information Center

Sport in general has long had ties with commercial interests, the most popular and widespread involving publicity. Intramural sports programs, however, have not cultivated many commercial involvements in publicity. The approach in intramural sports advertising is simple. A commercial interest pays for space or time in a given communication media…

Maas, Gerry

255

Turkish nursing students' views on practice assessments and service user involvement.  

PubMed

This descriptive study at one university in Turkey aimed to document nursing students' views on involvement of service users in clinical practice assessments. The study sample was comprised of 179 baccalaureate degree nursing students in their second, third, and fourth years of study. Data were collected using a questionnaire developed by the researchers. Participants indicated they had some problems with the present clinical practice assessment methods (73.2%) and that most of these stemmed from the clinical educators (68.2%). Sixty-eight percent of the participants responded positively to service user involvement in clinical practice assessments. However, some noted that this involvement might have some drawbacks. Results of the present study suggest that future studies on service user involvement in clinical practice assessment process are needed to further clarify this issue. PMID:23485223

Duygulu, Sergul; Abaan, Suheyla

2013-02-01

256

Problems on Divisibility of Binomial Coefficients  

ERIC Educational Resources Information Center

Twelve unusual problems involving divisibility of the binomial coefficients are represented in this article. The problems are listed in "The Problems" section. All twelve problems have short solutions which are listed in "The Solutions" section. These problems could be assigned to students in any course in which the binomial theorem and Pascal's…

Osler, Thomas J.; Smoak, James

2004-01-01

257

Teaching Problem Solving to College Students  

ERIC Educational Resources Information Center

This article describes steps of teaching problem solving to college students and provides examples in the context of a university course. The steps involve (1) identifying the types of problems and types of problem solving methods to be covered, (2) instructing the students in problem-recognition and problem solving methods, along with ways of…

Malouff, John M.

2011-01-01

258

Home Fires Involving Grills  

MedlinePLUS

... fires but these incidents occur throughout the year. Gas vs. Solid-Fueled Grills Four out of five ( ... while 16% used charcoal or other solid fuel. Gas grills were involved in an average of 7, ...

259

[Digestive involvement of scleroderma].  

PubMed

Digestive involvement in systemic sclerosis is frequent and serious, because it provides morbidity and fatality. From the pathophysiologic point of view, the first step could be Raynaud-associated neural dysfunction, followed by smooth muscle atrophy then irreversible muscle fibrosis. Oesophageal disorder is common with its main consequence: the occurrence of gastroesophageal reflux disease which could run into peptic erosive oesophagitis. Oesophageal manometry is the main diagnostic tool, gastrointestinal endoscopy helps to assess oesophageal mucosal inflammation and its possible sequels. Gastric involvement is rarely recognized but it is frequent in case of systematic investigation as well as small intestinal involvement which may provide a lot of complications: malabsorption, pseudoobstruction, bacterial overgrowth. At colonic level, anorectal involvement is frequent and leads to fecal incontinence and rectal prolapse. Reynold's syndrome is a special case which associates systemic sclerosis with primary biliary cirrhosis. The symptomatic treatments must be systematic and improve the disease's overall prognosis. PMID:12532866

Ponge, Thierry; Bruley des Varannes, Stanislas

2002-11-01

260

Immune System Involvement  

MedlinePLUS

... short-circuit psoriasis. Beyond that, other immune system cells involved in psoriasis are also a focus of drug development . For example, some cytokines carry inflammatory messages and help fuel the overall immune response in the skin. Some ...

261

Aliasing-Point Sampling Theory  

NSDL National Science Digital Library

A qualitative introduction to point sampling theory and how it applies to the problem of aliasing in computer graphics and some solutions to the problem. There are only images and html pages in this section.

2007-01-20

262

Examining the Role of Drinking Motives in College Student Alcohol Use and Problems  

Microsoft Academic Search

A motivational model of alcohol involvement (M. L. Cooper, M. R. Frone, M. Russell, & P. Mudar, 1995) was replicated and extended by incorporating social antecedents and motives and by testing this model cross-sectionally and longitudinally in a sample of college students. Participants (N = 388) completed a questionnaire battery assessing alcohol use and problems, alcohol expectancies, sensation seeking, negative

Jennifer P. Read; Mark D. Wood; Christopher W. Kahler; Jay E. Maddock; Tibor P. Palfai

2003-01-01

263

Illicit drug use, alcohol use and problem drinking among infrequent and frequent road ragers  

Microsoft Academic Search

The purpose of this paper is to investigate the relationships between illicit drug and alcohol use, problem drinking, and road rage. Particular attention is devoted to the association between these behaviors and frequent involvement in road rage activities. The data are taken from the 2002 Centre for Addiction and Mental Health (CAMH) Monitor, a representative telephone survey with a sample

Jennifer E. Butters; Reginald G. Smart; Robert E. Mann; Mark Asbridge

2005-01-01

264

Gene-by-Preschool Interaction on the Development of Early Externalizing Problems  

ERIC Educational Resources Information Center

Background: Preschool involves an array of new social experiences that may impact the development of early externalizing behavior problems over the transition to grade school. Methods: Using longitudinal data from a nationally representative sample of over 600 pairs of US twins, we tested whether the genetic and environmental influences on…

Tucker-Drob, Elliot M.; Harden, K. Paige

2013-01-01

265

The Association between Parental Personality Patterns and Internalising and Externalising Behaviour Problems in Children and Adolescents  

ERIC Educational Resources Information Center

Background: This study investigated the relationship between parental personality patterns and internalising and externalising behaviour problems in a clinically referred sample of children (aged 4-8) and adolescents (aged 12-18). Methods: Data from families involved in two clinical trials in Victoria, Australia were analysed (n = 59). Families…

Bertino, Melanie D.; Connell, Gabrielle; Lewis, Andrew J.

2012-01-01

266

DOPING IN SPORT: PROBLEMS OF INVOLVEMENT AND DETACHMENT  

Microsoft Academic Search

In some respects, public attitudes towards drug use appear curiously ambivalent for, though most people would strongly deprecate both the use of performance-enhancing drugs in sport and'drug abuse'within the wider society, it is almost certainly the case that, in modern western societies, we have come to be more dependent on the use of prescribed drugs than at any previous time

Ivan Waddington

2000-01-01

267

PROBLEMS INVOLVED IN COOPERATION BETWEEN UNIVERSITIES AND GOVERNMENT AGENCIES.  

ERIC Educational Resources Information Center

THE UNRESOLVED PURPOSE OF EDUCATION IN A DEMOCRATIC SOCIETY--WHETHER ACADEMIC OR PRAGMATIC GOALS SHOULD PREVAIL--IS IDENTIFIED AS THE BASIC CAUSE OF THE CONFLICT BETWEEN THE FEDERAL GOVERNMENT AND INSTITUTIONS OF HIGHER EDUCATION. SINCE WORLD WAR II, FEDERAL SUPPORT HAS BEEN INCREASINGLY DIRECTED TOWARD ACTION PROGRAMS, INCLUDING SPECIAL…

SHIRLEY, JOHN W.

268

Quality Circles: Involvement, Problem-Solving, and Recognition.  

ERIC Educational Resources Information Center

The media production department of Central Piedmont Community College (CPCC) began quality circle meetings in January 1981 after studying the process of quality circles and obtaining the understanding and support of the college administration. A quality circle is a small group of people doing similar work who voluntarily meet on a regular basis to…

Moretz, H. Lynn

1983-01-01

269

Problems with meson spectroscopy involving perturbative loop corrections  

E-print Network

In this talk we review the limitations of including meson loops as perturbative corrections in a solvable quark model. We first discuss meson-meson scattering within a formalism which treats confined quark pairs and mesons on an equal footing. The interaction between the mesons proceeds through $s$-channel meson-exchange diagrams. Next, we develop a perturbative expansion of the model, and show that the resonance poles found in such a treatment, even by accounting for contributions up to fourth order, do not coincide with those obtained with the full model. We conclude that the resonance predictions based on perturbative approximations in quark models are not reliable, especially in those cases where the coupling to the scattering channels is large.

Khemchandani, K P; Rupp, George

2015-01-01

270

Trace ratio problem revisited.  

PubMed

Dimensionality reduction is an important issue in many machine learning and pattern recognition applications, and the trace ratio (TR) problem is an optimization problem involved in many dimensionality reduction algorithms. Conventionally, the solution is approximated via generalized eigenvalue decomposition due to the difficulty of the original problem. However, prior works have indicated that it is more reasonable to solve it directly than via the conventional way. In this brief, we propose a theoretical overview of the global optimum solution to the TR problem via the equivalent trace difference problem. Eigenvalue perturbation theory is introduced to derive an efficient algorithm based on the Newton-Raphson method. Theoretical issues on the convergence and efficiency of our algorithm compared with prior literature are proposed, and are further supported by extensive empirical results. PMID:19304481

Jia, Yangqing; Nie, Feiping; Zhang, Changshui

2009-04-01

271

Are accidents scheduled. [safety management problems  

NASA Technical Reports Server (NTRS)

Two major sets of safety problems associated with project scheduling are examined. The first set involves problems resulting from the improper scheduling of the safety tasks. The second involves problems which result from inadequate attention to scheduling of those project tasks which lead to tests and operations and includes condensed schedules, modified schedules, schedule workarounds, eliminated portions of the schedules and strung out schedules.

Childs, C.

1976-01-01

272

Finite Sampling Models  

NSDL National Science Digital Library

Created by Kyle Siegrist of the University of Alabama-Huntsville, this is an online, interactive lesson on finite sampling models. The lesson provides examples, exercises, and applets that include hypergeometric distribution, multivariate hypergeometric distribution, order statistics, the matching problem, the birthday problem, and the coupon collector problem. This is the twelfth of seventeen different lessons created by Siegrist. This site is structured much like an online textbook.

Siegrist, Kyle

2009-02-27

273

Erection problems  

MedlinePLUS

... heart problems, or low testosterone A device you wear at night to check for normal nighttime erections Ultrasound of your penis to check for blood flow problems Rigidity monitoring to test how strong your erection is Psychological tests to ...

274

Walking Problems  

MedlinePLUS

... your legs or feet Movement disorders such as Parkinson's disease Diseases such as arthritis or multiple sclerosis Vision or balance problems Treatment of walking problems depends on the cause. Physical ...

275

Circumference and Problem Solving.  

ERIC Educational Resources Information Center

The concept of pi is one of great importance to all developed civilization and one that can be explored and mastered by elementary students through an inductive and problem-solving approach. Such an approach is outlined and discussed. The approach involves the following biblical quotation: "And he made a moltin sea ten cubits from one brim to the…

Blackburn, Katie; White, David

276

Word Problems: Simple Interest  

NSDL National Science Digital Library

This site explains to students the concept of simple interest, the four variables involved, and the formula for calculating simple interest. There is an example problem and two practice questions with hints and two more for students to take on individually. Students may check their answers when they are finished.

Sharon Taylor

2005-01-01

277

Emerging drug problems in Asia  

PubMed Central

This session, “Emerging Drug Problems in Asia,” focused on emerging drug problems in Asia. Dr. Juana Tomás-Rosselló discussed “East and Southeast Asia: Emerging Drug Problems and Response” and Dr. Wei J. Chen discussed “Ketamine Use among Regular Tobacco and Alcohol Users as Revealed by Respondent Driven Sampling in Taipei: Prevalence, Expectancy, and Users' Risky Decision Making.” PMID:25267884

Bart, Gavin

2014-01-01

278

Relationships with Adults as Predictors of Substance Use, Gang Involvement, and Threats to Safety among Disadvantaged Urban High-School Adolescents  

ERIC Educational Resources Information Center

Using a resilience framework, the authors examined the protective effects of parental support, self-disclosure to parents, parent-initiated monitoring of adolescent behavior, and relationships with school personnel on three critical problems of adolescents: substance use, gang involvement, and perceived threats to safety at school. The sample…

Ryan, Linda G.; Miller-Loessi, Karen; Nieri, Tanya

2007-01-01

279

Classic Problems  

NSDL National Science Digital Library

Classic problems from the Ask Dr. Math FAQ (Frequently Asked Questions) files, including: age word problems, birthday probability, boy or girl?, camel and bananas, coin problems, doubling pennies, grazing animals, liars and truthtellers, the missing dollar, Monty Hall (three doors), three houses three utilities, the Tower of Hanoi, two trains, two trains and a fly, and working together.

Forum, Math; Math Forum; Ask Dr. Math FAQ

2002-01-01

280

Treat Medication Samples with Respect  

MedlinePLUS

... a voucher program for medication samples. Problems with medication samples begin when they are dispensed from the office without clear instructions for use. Errors of all types have occurred when patients are ...

281

Father Involvement 1 Running head: PATTERNS OF FATHER INVOLVEMENT  

E-print Network

maternal parenting stress over time, the patterns of father involvement were unrelated to changes in youngFather Involvement 1 Running head: PATTERNS OF FATHER INVOLVEMENT Patterns of Father Involvement, Family Relations #12;Father Involvement 2 Patterns of Father Involvement in Teenage-Mother Families

Shyy, Wei

282

Continued detention involvement and adolescent marijuana use trajectories.  

PubMed

Justice-involved youth have high rates of marijuana use. Less is known about what may drive these rates, particularly when justice-involved youth return to the community. One factor that has been implicated is continued detention involvement. Yet, it is unknown how this factor may influence marijuana use trajectories. Using longitudinal growth curve modeling, the researchers evaluated the association between continued detention involvement and marijuana use trajectories in two large, ethnically diverse samples of community-based, justice-involved youth. Across both samples, marijuana use decreased over time for youth with continued detention involvement but did not change for youth without continued detention involvement. These findings underscore the importance of attending to the influence of detention involvement in community-based, justice-involved adolescents' marijuana use trajectories. This study also highlights the importance of coordinating prevention/intervention programming for justice-involved youth once they are in the community. PMID:24272742

Ewing, Sarah W Feldstein; Schmiege, Sarah J; Bryan, Angela D

2014-01-01

283

Organic contamination problems in the Viking molecular analysis experiment  

NASA Technical Reports Server (NTRS)

A principal problem in interpreting the results of an organic analysis of an extraterrestrial sample is that of distinguishing contaminating material from indigenous material when unknown types and amounts of contaminants make their way into the sample being analyzed. An approach to control of sample integrity in the Viking molecular analysis experiment has been devised which it is believed, will eliminate such problems. Basically this involves (1) placing an upper limit on the amount of terrestrial contamination that can be tolerated and still allow scientifically meaningful analysis, (2) identifying the potential sources of contamination and analyzing their relative significance, (3) establishing methods to control these sources, and (4) obtaining complete information on the chemical composition of potential contaminants. Previous experience in the Apollo mission has been of great value in developing the Viking program, perhaps the most important carryover being the recognition of the importance of establishing a comprehensive contamination control program in the early stages of mission planning and hardware design.

Flory, D. A.; Oro, J.; Fennessey, P. V.

1974-01-01

284

Sampling the Ocean Floor  

NSDL National Science Digital Library

In this lesson, students take samples from an unseen model of the ocean floor and try to accurately describe its composition. It will introduce the students to the limitations of sampling and the problem of obtaining representative samples of sea floor sediments. The lesson can also be an introduction to a study of geological oceanography or local geology. Younger children can use symbols or icons to keep track of the different sediment types as they sample, and make graphs of the total numbers of each type of sediment. Older students can compute percentages and compare the accuracy of each sample group to the actual composition of the ocean floor.

285

The Relationship Between Post-Traumatic Stress Symptoms and Substance Use Among Adolescents Involved with Child Welfare: Implications for Emerging Adulthood  

Microsoft Academic Search

The purpose of the present study was to examine the role of posttraumatic stress symptoms (PTSS) in predicting substance use\\u000a and substance-related problems in a sample of older youth and emerging adults involved with child welfare. The sample was\\u000a drawn from the Maltreatment and Adolescent Pathways (MAP) longitudinal study (Wekerle et al. 2009). Participants were 253 youth and emerging adults

Abby L. Goldstein; Christine Wekerle; Lil Tonmyr; Tiffany Thornton; Randall Waechter; Jessica Pereira; Ronald Chung

286

Gang Involvement and Membership among Homeless and Runaway Youth.  

ERIC Educational Resources Information Center

Assessed the extent of gang involvement among homeless and runaway youth, comparing gang members, gang-involved youth (not members), and non-gang youth on several dimensions. Interview data indicated that 15.4 percent of the youth were gang members and 32.2 percent were involved in gangs. These youth reported more family problems and school…

Yoder, Kevin A.; Whitbeck, Les B.; Hoyt, Dan R.

2003-01-01

287

Directionally differentiable multiobjective optimization involving discrete inclusions  

Microsoft Academic Search

This paper is devoted to multiobjective optimization problems involving discrete inclusions. The objective functions are assumed to be directionally differentiable and the domination structure is defined by a closed convex cone. The directional derivatives are not assumed to be linear or convex. Several concepts of optimal solutions are analyzed, and the corresponding necessary conditions are obtained as well in maximum

Y. Ishizuka; H. D. Tuan

1996-01-01

288

Increasing Public Involvement in Structural Biology  

E-print Network

instrumental in the solution of the crystal structure of the Mason-Pfizer Monkey Virus Retroviral Protease biology problems involving the analysis of existing mole- cules and the design of new ones are promising Quantitative Metric of Success Foldit is based on the principle that proteins fold to their lowest free

Baker, David

289

Problem solving, scaffolding and learning  

NSDL National Science Digital Library

Helping students to construct understanding of physics concepts and develop good problem solving skills is a central goal in many physics classrooms. This thesis examines studentsâ problem solving abilities and explores strategies to scaffold studentsâ learning. In studies involving analogical problem solving between isomorphic problems, we evaluate introductory physics studentsâ abilities to learn from provided solved problems and to transfer their learning to quiz problems involving the same physics principles but different surface features. Findings suggest that providing solved problems after students have attempted to solve quiz problems without help is a good way to scaffold studentsâ analogical problem solving. Categorization of problems based upon similarity of solution provides another angle to evaluate and scaffold studentsâ ability to reflect on problems' deep features. A study on categorization of quantum mechanics problems reveals that faculty overall perform better than students. However, unlike categorization of introductory mechanics problems, in which categories created by faculty are uniform and based on fundamental principles, quantum mechanics categorization is more diverse and based on concepts and procedures. In addition, we also explore possible strategies to help instructors improve their teaching of problem solving and to assess student difficulties more efficiently. Investigating how teaching assistants (TAs) design problem solutions, we find much room for improvement as TAs donât necessarily notice all solution components recommended in the research literature. Another study involving comparison between different assessment tools reveals that carefully designed multiple-choice questions can reflect the relative performance on the free-response problems while maintaining the benefit of ease of grading, especially if the multiple-choice question choices are weighted to reflect the different levels of understanding that students display.

Lin, Shih-Yin

2012-04-21

290

Individualized Math Problems in Ratio and Proportion. Oregon Vo-Tech Mathematics Problem Sets.  

ERIC Educational Resources Information Center

This is one of eighteen sets of individualized mathematics problems developed by the Oregon Vo-Tech Math Project. Each of these problem packages is organized around a mathematical topic and contains problems related to diverse vocations. Solutions are provided for all problems. This volume contains problems involving ratio and proportion. Some…

Cosler, Norma, Ed.

291

Individualized Math Problems in Whole Numbers. Oregon Vo-Tech Mathematics Problem Sets.  

ERIC Educational Resources Information Center

This is one of eighteen sets of individualized mathematics problems developed by the Oregon Vo-Tech Math Project. Each of these problem packages is organized around a mathematical topic and contains problems related to diverse vocations. Solutions are provided for all problems. Problems in this set require computations involving whole numbers.…

Cosler, Norma, Ed.

292

Individualized Math Problems in Fractions. Oregon Vo-Tech Mathematics Problem Sets.  

ERIC Educational Resources Information Center

This is one of eighteen sets of individualized mathematics problems developed by the Oregon Vo-Tech Math Project. Each of these problem packages is organized around a mathematical topic and contains problems related to diverse vocations. Solutions are provided for all problems. This package contains problems involving computation with common…

Cosler, Norma, Ed.

293

Equivalent differentiable optimization problems and descent methods for asymmetric variational inequality problems  

Microsoft Academic Search

Whether or not the general asymmetric variational inequality problem can be formulated as a differentiable optimization problem has been an open question. This paper gives an affirmative answer to this question. We provide a new optimization problem formulation of the variational inequality problem, and show that its objective function is continuously differentiable whenever the mapping involved in the latter problem

Masao Fukushima

1992-01-01

294

Individualized Math Problems in Logarithms. Oregon Vo-Tech Mathematics Problem Sets.  

ERIC Educational Resources Information Center

THis is one of eighteen sets of individualized mathematics problems developed by the Oregon Vo-Tech Math Project. Each of these problem packages is organized around a mathematical topic and contains problems related to diverse vocations. Solutions are provided for all problems. This volume includes problems involving logarithms, exponents, and…

Cosler, Norma, Ed.

295

Weekly Problems  

NSDL National Science Digital Library

This is an archive of previous problems from "Math by the Month", a regular department of Teaching Children Mathematics Journal from NCTM for K-5 teachers that features activities organized by grades K-2 and grades 3-5 and usually based on a theme associated with the particular month. Activities and problems posed are classroom-tested with an inquiry or problem-solving orientation.

2011-01-01

296

The Problem of Managing a Strategic Reserve.  

ERIC Educational Resources Information Center

The problem of managing the reserve of cobalt is presented, followed by a method for bringing the stockpiled amount from any level to a desired goal. Solving a stochastic programming problem is involved. The procedure is discussed in detail. (MNS)

Cole, David; And Others

1986-01-01

297

Knee Problems  

MedlinePLUS

... medicine, nursing, dentistry, veterinary medicine, the health care system, and preclinical sciences. Where Can People Find More Information About Knee Problems? National Institute of Arthritis and ...

298

Generativity and Social Involvement among African Americans and White Adults  

Microsoft Academic Search

The study examined the relation between generativity and social involvement in a sample of 253 community adults, approximately half African American and half White, between the ages of 34 and 65 years. For the sample as a whole, individual differences in generativity were positively asociated with social support from family and friends, involvement in religious activities, and political participation, and

Holly M. Hart; Dan P. McAdams; Barton J. Hirsch; Jack J. Bauer

2001-01-01

299

Problem Solving, Scaffolding and Learning  

ERIC Educational Resources Information Center

Helping students to construct robust understanding of physics concepts and develop good solving skills is a central goal in many physics classrooms. This thesis examine students' problem solving abilities from different perspectives and explores strategies to scaffold students' learning. In studies involving analogical problem solving…

Lin, Shih-Yin

2012-01-01

300

Contextual Problem Solving Model Origination  

ERIC Educational Resources Information Center

Problem solving has become a central focus of instructional activity in technology education classrooms at all levels (Boser, 1993). Impact assessment considerations incorporating society, culture, and economics are factors that require high-level deliberation involving critical thinking and the implementation of problem solving strategy. The…

Ernst, Jeremy V.

2009-01-01

301

Cluster Problems  

NSDL National Science Digital Library

In this 4-minute video, educators can watch a teacher deliver a fourth grade lesson on using number sense, arrays, and simpler calculations to solve a more complex problem, called a cluster problem. Watch this teacher check for understanding of multiplicative distribution and the use of arrays.

TeacherLine

2012-01-01

302

Problem Solving  

NSDL National Science Digital Library

This page of videos is designed to showcase classrooms in which the NCTM Process Standards are evident. Scroll to video #48, Problem Solving, and select the "VoD" box to view this half-hour video. It includes 13 classroom excerpts from lessons that illustrate students investigating and learning mathematics through problem solving. Teachers share their approaches and observations.

Boston, Wgbh

1997-01-01

303

Effects of Parental Involvement on Eighth-Grade Achievement  

Microsoft Academic Search

The indicators of parental involvement in children's education vary considerably across studies, most of which treat parental involvement as a unidimensional construct. This study identified four dimensions of parental involvement and assessed the relationship of each dimension with parental background and academic achievement for a large representative sample of U.S. middle school students. The findings provide little support for the

Esther Ho Sui-Chu

304

Examining Understandings of Parent Involvement in Early Childhood Programs  

ERIC Educational Resources Information Center

The importance of parent involvement in children's development and learning is increasingly recognized in the research literature and in federal and state policies; however, no unified definition of parent involvement exists. This study examined different understandings and definitions of parent involvement in a sample of administrators of…

Hilado, Aimee V.; Kallemeyn, Leanne; Phillips, Lauren

2013-01-01

305

Stages in Adolescent Involvement in Drug Use  

Microsoft Academic Search

Two longitudinal surveys based on random samples of high school students in New York State indicate four stages in the sequence of involvement with drugs: beer or wine, or both; cigarettes or hard liquor; marihuana; and other illicit drugs. The legal drugs are necessary intermediates between nonuse and marihuana. Whereas 27 percent of high school students who smoke and drink

Denise Kandel

1975-01-01

306

Optimizing patient involvement in quality improvement  

PubMed Central

IntroductionPatient and public involvement in healthcare planning, service development and health-related research has received significant attention. However, evidence about the role of patient involvement in quality improvement work is more limited. We aimed to characterize patient involvement in three improvement projects and to identify strengths and weaknesses of contrasting approaches. MethodsThree case study quality improvement projects were purposively sampled from a broader programme. We used an ethnographic approach involving 126 in-depth interviews, 12?weeks of non-participant observations and documentary analysis. Data analysis was based on the constant comparative method. ResultsThe three projects differed in the ways they involved patients in their quality improvement work, including their rationales for including patients. We characterized three very different models of patient involvement, which were each influenced by project context. Patients played distinctive roles across the three projects, acting in some cases as intermediaries between the wider patient community and clinicians, and sometimes undertaking persuasive work to convince clinicians of the need for change. We identified specific strategies that can be used to help ensure that patient involvement works most effectively and that the enthusiasm of patients to make a difference is not dissipated. ConclusionPatient involvement in quality improvement work needs careful management to realize its full potential. PMID:23374430

Armstrong, Natalie; Herbert, Georgia; Aveling, Emma-Louise; Dixon-Woods, Mary; Martin, Graham

2013-01-01

307

Sampling Error  

NSDL National Science Digital Library

This one page article, created by Statistics Canada, describes the meaning behind random sampling error. It points our the relationship of the random sampling error with the sample size, population size, variability of the characteristic, sampling plan, and measuring sampling error. While brief, this provides valuable information and also links users to additional resources concerning statistics.

2009-01-07

308

Enhancing chemistry problem-solving achievement using problem categorization  

NASA Astrophysics Data System (ADS)

The enhancement of chemistry students' skill in problem solving through problem categorization is the focus of this study. Twenty-four students in a freshman chemistry course for health professionals are taught how to solve problems using the explicit method of problem solving (EMPS) (Bunce & Heikkinen, 1986). The EMPS is an organized approach to problem analysis which includes encoding the information given in a problem (Given, Asked For), relating this to what is already in long-term memory (Recall), and planning a solution (Overall Plan) before a mathematical solution is attempted. In addition to the EMPS training, treatment students receive three 40-minute sessions following achievement tests in which they are taught how to categorize problems. Control students use this time to review the EMPS solutions of test questions. Although problem categorization is involved in one section of the EMPS (Recall), treatment students who received specific training in problem categorization demonstrate significantly higher achievement on combination problems (those problems requiring the use of more than one chemical topic for their solution) at (p = 0.01) than their counterparts. Significantly higher achievement for treatment students is also measured on an unannounced test (p = 0.02). Analysis of interview transcripts of both treatment and control students illustrates a Rolodex approach to problem solving employed by all students in this study. The Rolodex approach involves organizing equations used to solve problems on mental index cards and flipping through them, matching units given when a new problem is to be solved. A second phenomenon observed during student interviews is the absence of a link in the conceptual understanding of the chemical concepts involved in a problem and the problem-solving skills employed to correctly solve problems. This study shows that explicit training in categorization skills and the EMPS can lead to higher achievement in complex problem-solving situations (combination problems and unannounced test). However, such achievement may be limited by the lack of linkages between students' conceptual understanding and improved problem-solving skill.

Bunce, Diane M.; Gabel, Dorothy L.; Samuel, John V.

309

Capillary sample  

MedlinePLUS

... in the diagnosis of medical conditions. Capillary blood sampling offers several advantages over drawing blood from a ... sugar several times a day using capillary blood sampling. Disadvantages to capillary blood sampling include: Only a ...

310

Eyelid Problems  

MedlinePLUS

... wine stain, because of its resemblance to a dark red wine. If this birthmark involves the eye, ... examined by an ophthalmologist shortly after birth. Small dark moles, called nevi, on the eyelids or on ...

311

Community Providers’ Views of Alcohol Problems and Drug Problems  

PubMed Central

This study contrasts community health and social service providers’ views on alcohol vs. other drug abuse. A probability sample of 457 social work and other providers from a county’s public and private medical and mental health clinics, welfare and criminal justice systems, and substance abuse programs, as well as clergy, private therapists, and physicians were interviewed. For both alcohol and drug problems, providers thought only of severe dysfunctions, which suggest that less severe forms of these problems may evade detection. In addition, drug problems were viewed as more harmful than alcohol problems, which may result in providers minimizing alcohol problems. PMID:23565054

Gassman, Ruth A.; Weisner, Constance

2013-01-01

312

Covariance Matrix Estimation for the Cryo-EM Heterogeneity Problem*  

PubMed Central

In cryo-electron microscopy (cryo-EM), a microscope generates a top view of a sample of randomly oriented copies of a molecule. The problem of single particle reconstruction (SPR) from cryo-EM is to use the resulting set of noisy two-dimensional projection images taken at unknown directions to reconstruct the three-dimensional (3D) structure of the molecule. In some situations, the molecule under examination exhibits structural variability, which poses a fundamental challenge in SPR. The heterogeneity problem is the task of mapping the space of conformational states of a molecule. It has been previously suggested that the leading eigenvectors of the covariance matrix of the 3D molecules can be used to solve the heterogeneity problem. Estimating the covariance matrix is challenging, since only projections of the molecules are observed, but not the molecules themselves. In this paper, we formulate a general problem of covariance estimation from noisy projections of samples. This problem has intimate connections with matrix completion problems and high-dimensional principal component analysis. We propose an estimator and prove its consistency. When there are finitely many heterogeneity classes, the spectrum of the estimated covariance matrix reveals the number of classes. The estimator can be found as the solution to a certain linear system. In the cryo-EM case, the linear operator to be inverted, which we term the projection covariance transform, is an important object in covariance estimation for tomographic problems involving structural variation. Inverting it involves applying a filter akin to the ramp filter in tomography. We design a basis in which this linear operator is sparse and thus can be tractably inverted despite its large size. We demonstrate via numerical experiments on synthetic datasets the robustness of our algorithm to high levels of noise.

Katsevich, E.; Katsevich, A.; Singer, A.

2015-01-01

313

The U(1) problem  

Microsoft Academic Search

A detailed analysis of the problems associated with the conserved U(1) axial-vector current in quark-gluon models is presented. It is shown that such models involve a light isoscalar pseudoscalar boson, with a mass less than 3mpi. The existence of this boson would produce a strong off-shell variation in the eta-->3pi matrix element, thus invalidating the usual conclusions about the rate

Steven Weinberg

1975-01-01

314

Thyroid Problems  

MedlinePLUS

... treated differently. Common thyroid disorders and problems include: Hypothyroidism Hypothyroidism is a disorder in which your thyroid doesn’ ... normal after you get better. If you have hypothyroidism, however, the levels of T4 in your blood ...

315

Shoulder Problems  

MedlinePLUS

... What Should I Know About Specific Shoulder Problems, Including Their Symptoms and Treatment? The symptoms of shoulder ... and abstracts in the fields of medicine, nursing, dentistry, veterinary medicine, the health care system, and preclinical ...

316

Problem Solving  

NSDL National Science Digital Library

Students are introduced to a systematic procedure for solving problems through a demonstration and then the application of the method to an everyday activity. The unit project is introduced to provide relevance to subsequent lessons.

Office of Educational Partnerships,

317

Prostate Problems  

MedlinePLUS

... For cancer that has not spread from the prostate to other parts of the body, your doctor may suggest: F Watchful Waiting Or Active Surveillance . If the cancer is growing slowly and not causing problems, you ...

318

Growth Problems  

MedlinePLUS

... a more normal growth pattern. Continue What Are Growth Disorders? Teens may have growth problems for other ... Most cases of dwarfism are genetic. Back Continue Growth Hormone Deficiency One growth disorder that is specific ...

319

Rectal Problems  

MedlinePLUS

... as hemorrhoids, fissures, fistula, or abscess What is levator syndrome? The levator syndrome presents with an aching rectal pain related to ... an infectious problem such as Herpes virus. The levator syndrome is more commonly seen in women. The tenderness ...

320

Perfect Problems  

NSDL National Science Digital Library

Unsolved problems on perfect graphs, a collection for people with at least a basic knowledge of the subject. Contents include: Perfection of special classes of Berge graphs; Recognition of special classes of Berge graphs; Decompositions of perfect graphs; Minimal imperfect graphs, partitionable graphs, and monsters; Parity problems; The P4-structure; Quantitative variations on the Strong Perfect Graph Conjecture; Intersection graphs; The Markosyan manoeuvre; Appendix: Odds and ends. With a bibliography, and home pages of people interested in perfect graphs.

Chvátal, VasÌ?ek, 1946-

321

Cardiovascular involvement in leptospirosis.  

PubMed

Cardiovascular involvement was studied in 50 patients with serologically proved leptospirosis. Twelve (24%) patients had dyspnoea and 18 (36%) had transient hypotension during the illness. None of them had cardiac enlargement, development of new murmur or pericardial rub. Various electrocardiographic abnormalities occurred in 70 percent of patients. Atrial fibrillation was the most common major arrhythmia (14%). Conduction system abnormalities were seen in 36 percent of patients. T-wave changes were observed in 30 percent of patients. Left ventricular function as assessed by echocardiography and Doppler examination was normal. Three (6%) patients died due to renal failure. In conclusion, even though ECG abnormalities were frequently seen in leptospirosis, there was no data to support associated left ventricular dysfunction. Dyspnoea and hypotension occurring in patients of leptospirosis must be due to a noncardiac mechanism. PMID:9062020

Rajiv, C; Manjuran, R J; Sudhayakumar, N; Haneef, M

1996-01-01

322

Aluminium Involvement in Neurotoxicity  

PubMed Central

The aetiology of neurodegenerative diseases (ND) seems to involve susceptibility genes and environmental factors. Toxic metals are considered major environmental pollutants. Following our study of a case of multiple sclerosis (MS) improvement due to removal of aluminium (Al) and other toxic metals, we have examined the possible relationship between Al intoxication and ND. We used the slow intravenous treatment with the chelating agent EDTA (calcium disodium ethylene diamine tetraacetic acid) (chelation test) to remove Al and detected it in the urine collected from the patients for 12 hours. Patients affected by MS represented 85.6% of total ND. Al was present in 44.8% of cases comprehensive of ND and healthy patients. Al levels were significantly higher in ND patients than in healthy subjects. We here show that treatment of patients affected by Al burden with ten EDTA chelation therapies (EDTA intravenous administration once a week) was able to significantly reduce Al intoxication. PMID:25243176

Fulgenzi, Alessandro; Vietti, Daniele; Ferrero, Maria Elena

2014-01-01

323

Quantum rejection sampling  

E-print Network

Rejection sampling is a well-known method to sample from a target distribution, given the ability to sample from a given distribution. The method has been first formalized by von Neumann (1951) and has many applications in classical computing. We define a quantum analogue of rejection sampling: given a black box producing a coherent superposition of (possibly unknown) quantum states with some amplitudes, the problem is to prepare a coherent superposition of the same states, albeit with different target amplitudes. The main result of this paper is a tight characterization of the query complexity of this quantum state generation problem. We exhibit an algorithm, which we call quantum rejection sampling, and analyze its cost using semidefinite programming. Our proof of a matching lower bound is based on the automorphism principle which allows to symmetrize any algorithm over the automorphism group of the problem. Our main technical innovation is an extension of the automorphism principle to continuous groups that arise for quantum state generation problems where the oracle encodes unknown quantum states, instead of just classical data. Furthermore, we illustrate how quantum rejection sampling may be used as a primitive in designing quantum algorithms, by providing three different applications. We first show that it was implicitly used in the quantum algorithm for linear systems of equations by Harrow, Hassidim and Lloyd. Secondly, we show that it can be used to speed up the main step in the quantum Metropolis sampling algorithm by Temme et al.. Finally, we derive a new quantum algorithm for the hidden shift problem of an arbitrary Boolean function and relate its query complexity to "water-filling" of the Fourier spectrum.

Maris Ozols; Martin Roetteler; Jérémie Roland

2011-12-13

324

Anatomy of the Selection Problem  

Microsoft Academic Search

This article considers anew the problem of estimating a regression E(y|x) when realizations of (y, x) are sampled randomly but y is observed selectively. The central issue is the failure of the sampling process to identify E(y|x). The problem faced by the researcher is to find correct prior restrictions which, when combined with the data, identify the regression. Two kinds

Charles F. Manski

1989-01-01

325

Snowball Sampling  

Microsoft Academic Search

An $s$ stage $k$ name snowball sampling procedure is defined as follows: A random sample of individuals is drawn from a given finite population. (The kind of random sample will be discussed later in this section.) Each individual in the sample is asked to name $k$ different individuals in the population, where $k$ is a specified integer; for example, each

Leo A. Goodman

1961-01-01

326

Nonprobability Sampling  

NSDL National Science Digital Library

This site, created by author William M.K. Trochim, describes numerous methods of nonprobability sampling, including accidental, haphazard or convenience sampling and many other types of purposive methods. Some of these purposive methods he describes are: modal instance, expert, quota, heterogeneity, and snowball sampling. Overall, this is a good, albeit brief, overview of the subject of nonprobability sampling.

Trochim, William M.

2008-12-12

327

Applying Employee Involvement in Schools.  

ERIC Educational Resources Information Center

The applicability of employee-involvement approaches to the management of schools is explored, describing three approaches (parallel-suggestion involvement, job involvement, and high involvement). Design issues (technology; organizational structure; leadership; organizational boundaries, customer definition, and relation to stakeholder; measures;…

Mohrman, Susan Albers; And Others

1992-01-01

328

Health Problems of Migrant Children.  

ERIC Educational Resources Information Center

This investigation examined the incidence and types of health-related problems of migrant children as identified by school health medical personnel. Results indicated 615 of the 1,000 children in the sample had physical, visual, dental, auditory, immunization, or nutritional problems. Implications are discussed. (Author/MT)

Michael, Robert J.; Salend, Spencer J.

1985-01-01

329

Sampling for area estimation: A comparison of full-frame sampling with the sample segment approach  

NASA Technical Reports Server (NTRS)

The author has identified the following significant results. Full-frame classifications of wheat and non-wheat for eighty counties in Kansas were repetitively sampled to simulate alternative sampling plans. Evaluation of four sampling schemes involving different numbers of samples and different size sampling units shows that the precision of the wheat estimates increased as the segment size decreased and the number of segments was increased. Although the average bias associated with the various sampling schemes was not significantly different, the maximum absolute bias was directly related to sampling size unit.

Hixson, M.; Bauer, M. E.; Davis, B. J. (principal investigators)

1979-01-01

330

[Nail involvement in leprosy].  

PubMed

Leprosy, a disease caused by Mycobacterium leprae, primarily affects the skin and nerves, but the nails are also involved in as many as 3 out of 4 patients .The factors that trigger nail changes in leprosy are numerous and include repeated trauma, neuropathy, vascular impairment, infections, lepra reactions, and the drugs used to manage the disease. The changes most often reported include subungual hematomas, onycholysis, onychauxis, onychogryphosis, pterygium unguis, and onychoheterotopia, most of which can be attributed to nerve damage and trauma. Furthermore, the acro-osteolysis that occurs in the advanced stages of the disease may present with brachyonychia, racquet nails, or even anonychia. Infections of the nail bed leading to paronychia and onychomycosis should also be taken into account in leprosy. Other typical changes include longitudinal striae, pitting, macrolunula, Terry nails, leukonychia, hapalonychia, and Beau lines. In this review, we describe the principal nail changes associated with leprosy. These changes, which are highly varied and diverse in origin, are in fact a reflection of the significant morbidity caused by M. leprae infection. PMID:22056258

Belinchón Romero, I; Ramos Rincón, J M; Reyes Rabell, F

2012-05-01

331

Sampling Distribution of Sample Means  

NSDL National Science Digital Library

This applet generates a graph of the sampling distribution of sample means and displays the probabilities associated with that distribution. Users enter the mean and standard deviation of the source population and the size of the samples. The applet also calculates the standard error of the sample means.

Lowry, Richard

2009-01-08

332

Messy problem.  

PubMed

Tougher EPA rules on incinerating medical waste have hospitals grappling with how to manage their garbage. Outsourcing is one possibility, but that will involve higher costs, too. "There will be cost, but it will be nominal. We think it will be less than 5% of current operating costs," says Steven Groenke, vice president of medical-waste processor Curtis Bay Energy. PMID:19842261

Rhea, Shawn

2009-09-28

333

Multidrug toxicity involving sumatriptan.  

PubMed

A multidrug fatality involving sumatriptan is reported. Sumatriptan is a tryptamine derivative that acts at 5-HT1B/1D receptors and is used for the treatment of migraines. The decedent was a 21-year-old white female found dead in bed by her spouse. No signs of physical trauma were observed and a large number of prescription medications were discovered at the scene. Toxicological analysis of the central blood revealed sumatriptan at a concentration of 1.03 mg/L. Following therapeutic dosing guidelines, sumatriptan concentrations do not exceed 0.095 mg/L. Sumatriptan was isolated by solid-phase extraction and analyzed using liquid chromatography-tandem mass spectrometry in multiple reaction monitoring mode. A tissue distribution study was completed with the following concentrations measured: 0.61 mg/L in femoral blood, 0.56 mg/L in iliac blood, 5.01 mg/L in urine, 0.51 mg/kg in liver, 3.66 mg/kg in kidney, 0.09 mg/kg in heart, 0.32 mg/kg in spleen, 0.01 mg/kg in brain, 15.99 mg/kg in lung and 78.54 mg/45 mL in the stomach contents. Carisoprodol, meprobamate, fluoxetine, doxylamine, orphenadrine, dextromethorphan and hydroxyzine were also present in the blood at the following concentrations: 3.35, 2.36, 0.63, 0.19, 0.06, 0.55 and 0.16 mg/L. The medical examiner ruled the cause of death as acute mixed drug toxicity and the manner of death as accident. PMID:25324526

Knittel, Jessica L; Vorce, Shawn P; Levine, Barry; Hughes, Rhome L; Bosy, Thomas Z

2015-01-01

334

Sampling Distributions  

NSDL National Science Digital Library

This applet simulates and plots the sampling distribution of various statistics (i.e. mean, standard deviation, variance). The applet allows the user to specify the population distribution, sample size, and statistic. An animated sample from the population is shown and the statistic is plotted. This can be repeated to produce the sampling distribution of the statistic. After the sampling distribution is plotted it can be compared to a normal distribution by overlaying a normal curve. These features make it useful for introducing students in a first course to the idea of a sampling distribution. The site also includes instructions and exercises.

Lane, David M.

2009-11-26

335

Ear Problems  

MedlinePLUS

... ear dry while it's healing. Putting a warm heating pad over your ear may help relieve the pain. You can prevent swimmer's ear by placing 3 to 5 ... medicine for a few days. Putting a warm heating pad on your ear may help relieve the pain. ... bite down? Yes A tooth problem can radiate pain to the ear on the same ...

336

Interaction of Adrenocortical Activity and Autonomic Arousal on Children's Externalizing and Internalizing Behavior Problems.  

PubMed

The psychobiology of stress involves two major components, the hypothalamic-pituitary-adrenal (HPA) axis and the autonomic nervous system (ANS). Research has revealed the association between behavior problems and the psychobiology of stress, yet findings are inconsistent and few studies have addressed the moderate correlations between behavior problems. This study examines the individual and interactive effects of HPA and ANS on child behavior problems while taking into account the comorbidity of externalizing and internalizing problems. Four saliva samples were collected from each participant in a community sample (N?=?429; aged 11-12 years; 50.49 % male), which were assayed for cortisol (HPA) and alpha-amylase, sAA (ANS). Children's behavior problems were assessed using parent-report and self-report versions of the Child Behavior Checklist. Latent variables were constructed to represent trait-like individual differences in cortisol and sAA. Low levels of HPA axis activity were associated with higher levels of both externalizing and internalizing problems, but only among children with low ANS arousal. The association between externalizing and internalizing problems diminished to non-significant after taking into account the influence of HPA axis activity and ANS arousal, which suggests that the psychobiology of stress explains a fair proportion of comorbidity of behavior problems. The findings support that interaction between HPA axis and ANS functioning has potential to clarify prior mixed findings and advance our understanding of the child behavior problems. PMID:24943055

Chen, Frances R; Raine, Adrian; Soyfer, Liana; Granger, Douglas A

2015-01-01

337

The Birthday Problem  

NSDL National Science Digital Library

This lesson, created by faculty members at the University of Virginia, is based on Lawrence Lesser's article that describes the set-up of the spreadsheet simulation and Cindia Stewart's lesson that seeks to answer the Birthday Problem using three different methods. Probability topics include: sample size, Law of Large Numbers, complementary probabilities, and independence of events. The authors include external reference for those looking for more resources on this subject.

2009-03-24

338

Annealed Importance Sampling Reversible Jump MCMC algorithms  

SciTech Connect

It will soon be 20 years since reversible jump Markov chain Monte Carlo (RJ-MCMC) algorithms have been proposed. They have significantly extended the scope of Markov chain Monte Carlo simulation methods, offering the promise to be able to routinely tackle transdimensional sampling problems, as encountered in Bayesian model selection problems for example, in a principled and flexible fashion. Their practical efficient implementation, however, still remains a challenge. A particular difficulty encountered in practice is in the choice of the dimension matching variables (both their nature and their distribution) and the reversible transformations which allow one to define the one-to-one mappings underpinning the design of these algorithms. Indeed, even seemingly sensible choices can lead to algorithms with very poor performance. The focus of this paper is the development and performance evaluation of a method, annealed importance sampling RJ-MCMC (aisRJ), which addresses this problem by mitigating the sensitivity of RJ-MCMC algorithms to the aforementioned poor design. As we shall see the algorithm can be understood as being an “exact approximation” of an idealized MCMC algorithm that would sample from the model probabilities directly in a model selection set-up. Such an idealized algorithm may have good theoretical convergence properties, but typically cannot be implemented, and our algorithms can approximate the performance of such idealized algorithms to an arbitrary degree while not introducing any bias for any degree of approximation. Our approach combines the dimension matching ideas of RJ-MCMC with annealed importance sampling and its Markov chain Monte Carlo implementation. We illustrate the performance of the algorithm with numerical simulations which indicate that, although the approach may at first appear computationally involved, it is in fact competitive.

Karagiannis, Georgios; Andrieu, Christophe

2013-03-20

339

Violence involving intimate partners  

PubMed Central

OBJECTIVE To investigate the prevalence of violence involving intimate partners among women visiting Canadian family practices and to assess participants’ attitudes toward future use of computer-assisted screening for violence and other health risks. DESIGN Self-report via written survey. SETTING Group family practice clinic in inner-city Toronto, Ont. PARTICIPANTS Women patients at least 18 years old who were fluent in English. MAIN OUTCOME MEASURES Responses to questions about violence selected from the Abuse Assessment Screen and the Partner Violence Screen. Participants’ attitudes toward computer-assisted screening as measured by the Computerized Lifestyle Assessment Scale (1 to 5) in the domains of benefits, privacy—barriers, interaction—barriers, and interest. RESULTS Responses were received from 202 patients, 144 of whom were in current or recent relationships and completed the section on intimate-partner violence (IPV). The overall prevalence of IPV in current or recent relationships was 14.6%. Emotional abuse was reported by 10.4%, threat of violence by 8.3%, and physical or sexual violence by 7.6% of respondents. Emotional abuse was significantly associated with threat of violence and physical or sexual violence (P?.001). Analysis of responses to questions on computerized screening revealed that participants generally perceived it would have benefits (mean score 3.6) and were very interested in it (mean score 4.3). Those who reported experiencing IPV rated the benefits of computerized screening significantly higher than respondents without IPV experiences did (t2.3, df142, P < .05). Participants were “not sure” about barriers (mean score 3.0). Responses were similar in the 2 groups for the domains of interest, privacy—barriers, and interaction—barriers. CONCLUSION The high rate of IPV reported by women attending family practices calls for physicians to be vigilant. Future research should examine ways to facilitate physicians’ inquiry into IPV. The positive attitudes of our participants toward interactive computer-assisted screening indicates a need for more research in this area. PMID:17872682

Ahmad, Farah; Hogg-Johnson, Sheilah; Stewart, Donna E.; Levinson, Wendy

2007-01-01

340

Parental Involvement and Students' Academic Achievement: A Meta-Analysis  

Microsoft Academic Search

The idea that parental involvement has positive influence on students' academic achievement is so intuitively appealing that society in general, and educators in particular, have considered parental involvement an important ingredient for the remedy for many problems in education. The vast proportion of the literature in this area, however, is qualitative and nonempirical. Among the empirical studies that have investigated

Xitao Fan; Michael Chen

2001-01-01

341

Outdoor Education Directory: Organizations Involved in Outdoor Experiential Education.  

ERIC Educational Resources Information Center

This directory lists organizations actively involved in outdoor experiential education. Outdoor experiential education includes some or all of the following elements: (1) active involvement in solving outdoor problems; (2) verbal reflection following the experience; (3) introduction of a level of stress or challenge in completing the outdoor…

ERIC Clearinghouse on Rural Education and Small Schools, Charleston, WV.

342

Time Estimation Deficits in Developmental Dyslexia: Evidence of Cerebellar Involvement  

Microsoft Academic Search

In addition to their language-related difficulties, dyslexic children suffer problems in motor skill, balance, automatization and speeded performance. Given the recent evidence for cerebellar involvement in the acquisition of language fluency, these problems suggest cerebellar deficit. To test the hypothesis of cerebellar dysfunction in dyslexia, a time estimation task considered to be a sensitive index of cerebellar function was administered

Roderick I. Nicolson; Angela J. Fawcett; Paul Dean

1995-01-01

343

Collecting Samples  

USGS Multimedia Gallery

Collecting Samples at Embden 3. Embden 3 is a 60-degree V trapezoidal flume in a bured concreate culvert located on the other side of the north-south road east of the large data shelter. The flow is measured and sampled from the V flume underground and periodic QW grab samples are taken form the blu...

344

Probability Sampling  

NSDL National Science Digital Library

This site, created by author William M.K. Trochim, describes in detail five different types of random sampling. Some of these types include: simple random, stratified random, systematic random, cluster random, multi-stage sampling. The author provides examples, definitions, and the procedures behind the methods. Overall, this site provides a nice overview of probability sampling.

Trochim, William M.

2008-12-30

345

Attributes Heeded When Representing an Osmosis Problem.  

ERIC Educational Resources Information Center

Eighteen high school science students were involved in a study to determine what attributes in the problem statement they need when representing a typical osmosis problem. In order to realize this goal students were asked to solve problems aloud and to explain their answers. Included as a part of the results are the attributes that the students…

Zuckerman, June Trop

346

Model problem  

NASA Technical Reports Server (NTRS)

Our purpose in examining this test problem is to measure directly the effect of mesh refinement and the resulting mesh interfaces on a known wave that is sensitive to phase errors, while concurrently being able to visually display a meaningful picture of the effects of the refinement induced error on the solution. The refined mesh must be able to adequately capture the diffraction behavior, so that the plane wave front bends as it passes through the slit. Given that the coarse and refined meshes are sufficiently accurate, the phase errors introduced during the problem solution will be a function of th sound speed on the two grids plus the coarse/refined grid interaction errors.

Perkins, A. Louise

1991-01-01

347

Random Samples  

NSDL National Science Digital Library

Created by Kyle Siegrist of the University of Alabama-Huntsville, this is an online, interactive lesson on random samples. The author provides examples, exercises, and applets concerning many different topics. Some of these include: sample mean, law of large numbers, sample variance, partial sums, central limit theorem, special properties of normal samples, order statistics, and sample covariance and correlation. Additionally, the author provides links to external resources for students wanting to engage further with the topic. This is simply one of seventeen lessons. They are all easily accessible as the author has formatted his site much like an online textbook.

Siegrist, Kyle

348

Problem Behaviors among Israeli Undergraduate Students: Applying Jessor’s Problem Behavior Theory among Young Adult Students  

PubMed Central

Purpose: The current study tested the applicability of Jessor’s problem behavior theory (PBT) in Ariel University. Methods: A structured, self-reported, anonymous questionnaire was administered to undergraduate students. The final study sample included 1,360 participants (882 females and 478 males, mean age 25, SD?=?2.9, range?=?17). Results: Findings indicated that the PBT was replicated in this sample. As shown from the hierarchal linear regression model, religiosity and high-academic achievements were found to be strong and significant protective factors that reduce risk behaviors. Among young and religious students, the personal vulnerability has almost no impact on involvement in risk behaviors. Conclusion: The PBT finds empirical support in this young adult undergraduate Israeli sample. PMID:25566519

Korn, Liat; Shaked, Yael; Fogel-Grinvald, Haya

2014-01-01

349

Involvement of older drivers in multivehicle side-impact crashes.  

PubMed

Side impacts were studied using three separate analyses. National Accident Sampling System (NASS) and National Crash Severity Study (NCSS) cases were reviewed on multivehicle crashes involving fatal chest and abdominal injury by interior contact. Twenty-five cases were analyzed and showed an unusually high involvement of older occupants. Analyses of the 1975-1986 FARS confirmed an overinvolvement. Sixty-four percent of near-side seated occupants were over 50 years old and 36% over 70 in fatal multivehicle side impacts. In contrast, 26% of victims in single-vehicle frontal crashes were over 50 and 8% over 70 years old. Analysis of the 1982-1986 NASS showed that single-vehicle side impacts are not an important injury risk for older drivers, except on icy or wet roads. In contrast, the risk of injury in multivehicle side impacts increases steadily with age and is a major problem for older drivers. The individual NASS and NCSS cases also showed that 88% of the multivehicle side crashes took place at an intersection and that the driver of the struck vehicle frequently caused the crash by driving error (48%) or traffic violation (16%). The majority of cases occurred in daylight hours, on dry roads, and without alcohol involvement. Changes in visual perception, judgment and attention of the older driver may be factors in their missing a traffic signal or turning in front of traffic under the right-of-way. In addition, a reduced tolerance to impact force probably contributes to the injury. Although an analysis of photographs of the side-impacted vehicle indicated that 44% had side-structure deformation that was similar to that produced in the National Highway Traffic Safety Administration (NHTSA) moving deformable barrier test, only 24%-32% of the cases actually addressed the proposed NHTSA dynamic side-impact test. The results of this analysis bear on the agency's preliminary regulatory impact analysis. PMID:2331292

Viano, D C; Culver, C C; Evans, L; Frick, M; Scott, R

1990-04-01

350

RESEARCH OR TEACHING INVOLVING ANIMALS  

E-print Network

Page 1 RESEARCH OR TEACHING INVOLVING ANIMALS University Policy No: RH8110 Classification: Research for Conducting Research or Teaching Involving Animals Animal Care Committee Terms of Reference PURPOSE 1.00 The purpose of this policy is to set out provisions to ensure that all research or teaching involving animals

Victoria, University of

351

Cardiovascular involvement in relapsing polychondritis  

Microsoft Academic Search

Relapsing polychondritis is an inflammatory disease that characteristically involves cartilagenous tissues. Cardiovascular involvement is a fairly common complication and the second most frequent cause of mortality in this disease. The case of a man with a progressive cardiac involvement, aortic incompetence, mitral regurgitation, and finally complete atrioventricular block offered the opportunity of reviewing the cardiovascular complications in relapsing polychondritis. The

Attilio Del Rosso; Nunzia Rosa Petix; Mauro Pratesi; Alessandro Bini

1997-01-01

352

Ethical issues involving the internet  

SciTech Connect

During the 90`s, the {open_quotes}Information Superhighway{close_quotes} has received widespread publicity. Many campuses have participated in this drive to an information based society by becoming participating nodes on the Internet. As an information provider, the Internet has the potential to change the college experience in many ways, both good and bad. It also poses a number of problems for college students in areas such as privacy, access, and honesty. It provides professors with a dynamic information storage and retrieval tool that offers the opportunity to modernize both curriculum experiences and pedagogical approaches. On some campuses, Internet access and capability has become so important that course modules and whole courses are being built. The panelists will each discuss a different issue involved with making the Internet more integral to the collegiate environment. The first panelist will consider risks and threats that an institution of higher learning must consider as it approaches Internet use will be presented. The steps an institution took to build policies and deal with {open_quotes}inevitable incidents{close_quotes} that will occur as the Internet is opened to full use by both students and faculty. The second panelist will present four computer ethics Each module uses the abundance and dynamism of Internet information to provide challenging {open_quotes}Ethics in the Computer Workplace{close_quotes} experiences that could not easily be done by traditional means. The third panelist will discuss a course module that explores both the positive and negative potential of the Internet. The costs and ease of Internet access, as well as normally available Internet tools, are also presented. This module has been used in a course called {open_quotes}Ethical and Social Issues in Computer Science{close_quotes} and will be used in a general-education course to be offered beginning in 1994-95.

Scott, T.J. [Western Illinois Univ., Macomb, IL (United States); Kallman, E.A. [Bentley College, Waltham, MA (United States); Lelewer, D. [California State Univ., Pomona, CA (United States)

1994-12-31

353

The Yo-Yo Problem  

NSDL National Science Digital Library

In this math lesson, learners explore linear patterns, write a pattern in symbolic form, and solve linear equations using algebra tiles, symbolic manipulation, and a graphing calculator. The lesson begins with the presentation of the yo-yo problem. Then learners complete a hands-on activity involving a design created with pennies. Algebra tiles are introduced next as learners practice solving linear equations. Finally, learners return to solving the yo-yo problem.

Pbs

2012-01-01

354

SOIL AND SEDIMENT SAMPLING METHODS  

EPA Science Inventory

The EPA Office of Solid Waste and Emergency Response's (OSWER) Office of Superfund Remediation and Technology Innovation (OSRTI) needs innovative methods and techniques to solve new and difficult sampling and analytical problems found at the numerous Superfund sites throughout th...

355

A Test of Biosocial Models of Adolescent Cigarette and Alcohol Involvement  

PubMed Central

We tested biosocial models that posit interactions between biological variables (testosterone, estradiol, pubertal status, and pubertal timing) and social context variables (family, peer, school, and neighborhood) in predicting adolescent involvement with cigarettes and alcohol in a sample of 409 adolescents in grades 6 and 8. Models including the biological and contextual variables and their interactions explained significantly more variance in adolescent cigarette and alcohol involvement than did models including only the main effects of the biological and contextual variables. Post-hoc analyses of significant interactions suggested that, in most case, moderation occurred in the hypothesized direction. Consistent with dual hazards models of adolescent antisocial behaviors, the relationships between the biological and substance use variables became positive and stronger as the context became more harmful. Considerations of adolescent substance use, and perhaps other problem behaviors, should recognize the possible role of biological variables and how their influence may vary by social context. PMID:24415825

Foshee, Vangie A.; Ennett, Susan T.; Bauman, Karl E.; Granger, Douglas A.; Benefield, Thad; Suchindran, Chirayath; Hussong, Andrea M.; Karriker-Jaffe, Katherine J.; DuRant, Robert H.

2013-01-01

356

Principles for Sampling Airborne Radioactivity from Stacks  

SciTech Connect

This book chapter describes the special processes involved in sampling the airborne effluents from nuclear faciities. The title of the book is Radioactive Air Sampling Methods. The abstract for this chapter was cleared as PNNL-SA-45941.

Glissmeyer, John A.

2010-10-18

357

Reciprocal Longitudinal Relations Between Nonresident Father Involvement and Adolescent Delinquency  

Microsoft Academic Search

Using a representative sample of low-income, primarily minority adolescents (N 5647, aged 10-14 years at Wave 1), this study examined bidirectional longitudinal relations between nonresident father involvement, defined as contact and responsibility for children's care and behavior, and adolescent engagement in delinquent activities. Autoregressive and fixed effects models found that higher nonresident father involvement predicted subsequent decreases in adolescent delinquency,

Rebekah Levine Coley; Bethany L. Medeiros

2007-01-01

358

Educational Decision Making: The Involvement of Parents; Myth or Reality.  

ERIC Educational Resources Information Center

The development of Federal requirements for parent involvement, via Title I, in cooperative education and policy making roles is reviewed chronologically. Variations in the implementation of plans to involve parents are examined for 15 local school districts in 14 states. The survey instrument and the sampling technique utilized for exploring…

Hightower, Herma J.

359

Ethnicity and Language Contributions to Dimensions of Parent Involvement  

ERIC Educational Resources Information Center

This study examined ethnic and language group differences on dimensions of parent-rated and teacher-rated parent involvement after adjusting for the influence of family socioeconomic factors. A total of 179 teachers and 481 parents provided information on parent school involvement for a sample of ethnically and linguistically diverse first-grade…

Wong, Shuk Wa; Hughes, Jan N.

2006-01-01

360

Treatment of alcohol problems.  

PubMed

This paper gives an overview of the variety of approaches that have been used in the treatment of alcohol problems. There is good evidence that approaches directed at improving social and marital relationships, self-control and stress management are effective. There is at present little to suggest that aversion therapies, confrontational interventions, educational lectures or films and group psychodynamic therapy are effective, nor is there good evidence yet that use of psychotropic medications is effective. However, it may be that therapies that have not proved effective with the broad range of individuals with alcohol problems might prove effective with selected cases. Future research should place more emphasis on determining the kinds of alcohol problems that are likely to respond to different kinds of treatments directed at different kinds of goals and by different kinds of practitioners. The base of treatment should be broadened to include the large numbers of individuals with alcohol problems but who could not be considered as alcohol-dependent. This would have to involve a wide range of primary care and generic workers and include use of brief interventions. PMID:7841867

Hodgson, R

1994-11-01

361

THE PREVALENCE OF CANNABIS-INVOLVED DRIVING IN CALIFORNIA  

PubMed Central

Background Various national surveys suggest that cannabis use is rising nationally, and many States have passed legislation that has potential to increase usage even further. This presents a problem for public roadways, as research suggests that cannabis impairs driving ability. Methods Anonymous oral fluid samples and breath tests were obtained from more than 900 weekend nighttime drivers randomly sampled from six jurisdictions in California. Oral fluid samples were assayed for the presence of Schedule I drugs. Drivers also completed information on self-reported drug use and possession of a medical cannabis permit. Data from the 2007 National Roadside Survey (collected using comparable methods) were used as a comparison. Results Using the 2010 data, a total of 14.4% of weekend nighttime drivers tested positive for illegal drugs, with 8.5% testing positive for delta-9-tetrahydrocannabinol (THC). THC-positive rates varied considerably among jurisdictions, from a low of 4.3% in Fresno to a high of 18.3% in Eureka. A comparison with the 2007 NRS data found an increase in THC-positive drivers in 2010, but no increase in illegal drugs other than cannabis. Drivers who reported having a medical cannabis permit were significantly more likely to test positive for THC. Conclusions Cannabis-involved driving has increased in California since 2007. Nearly 1-in-10 weekend, nighttime drivers tested positive for THC, and in some jurisdictions, the rate was nearly 1-in-5. The possible contribution of cannabis legislation, such as decriminalization and medical cannabis usage, is discussed. PMID:22101027

Johnson, Mark B.; Kelley-Baker, Tara; Voas, Robert B.; Lacey, John H.

2013-01-01

362

Sampling Rocks  

NSDL National Science Digital Library

In this lesson, students will learn about sampling through an investigation of rocks found in the schoolyard. This will provide a start to understanding everyday statistics. They will first collect and analyze a sample of rocks from the schoolyard and array the collected rocks by characteristics such as size, weight, and color, to see if any generalizations can be made about the types of rocks that can be found in the schoolyard. Students will then be introduced to the notion of a sample and how the size and method of collection of a sample can bias findings.

363

Anal Involvement in Pemphigus Vularis  

PubMed Central

Background. Pemphigus vulgaris (PV) is an autoimmune blistering disease of the skin and mucosa. Anal mucosa may be involved in PV, but the frequency and clinical profile are not fully ascertained. Objective. The aim was to investigate the involvement of the anal area in newly diagnosed PV patients. Patients and Methods. A total of 168 consecutive newly diagnosed PV patients were enrolled. Anal symptoms and signs, involvement of other body sites, and severity of disease were recorded. Results. A total of 47 out of 168 patients (27.9%) had involvement of the anal area. Anal involvement was significantly associated with PV lesions in ophthalmic (P = 0.03), nasal (P = 0.02), and genital mucosa (P < 0.001) but not the oral cavity (P = 0.24). There was a significant association between number of involved mucosal sites and anal involvement (P < 0.001). Anal involvement was associated with oral severity (P = 0.02). Constipation was the most frequent symptom (73.8%) followed by pain on defecation (50%). Seventeen patients (36%) were symptom-free. Erosion was the most frequent sign (91.5%). Conclusion. Anal involvement in PV seems to be more frequent than previously assumed. Routine anal examination is recommended even in asymptomatic patients as anal involvement appears to correlate with the severity of PV. PMID:24298388

Khezri, Somayeh; Mahmoudi, Hamid-Reza; Masoom, Seyedeh Nina; Daneshpazhooh, Maryam; Balighi, Kamran; Hosseini, S. Hamed; Chams-Davatchi, Cheyda

2013-01-01

364

Problem Analysis Using Small Problem Frames  

Microsoft Academic Search

The notion of a problem frame is introduced and explained, and its use in analysing and structuring problems is illustrated. A problem frame characterises a class of simple problem. Realistic problems are seen as compositions of simple problems of recognised classes corresponding to known frames.

M. A. Jackson

1999-01-01

365

Analog Processor To Solve Optimization Problems  

NASA Technical Reports Server (NTRS)

Proposed analog processor solves "traveling-salesman" problem, considered paradigm of global-optimization problems involving routing or allocation of resources. Includes electronic neural network and auxiliary circuitry based partly on concepts described in "Neural-Network Processor Would Allocate Resources" (NPO-17781) and "Neural Network Solves 'Traveling-Salesman' Problem" (NPO-17807). Processor based on highly parallel computing solves problem in significantly less time.

Duong, Tuan A.; Eberhardt, Silvio P.; Thakoor, Anil P.

1993-01-01

366

MANUAL OF ANALYTICAL QUALITY CONTROL FOR PESTICIDES AND RELATED COMPOUNDS IN HUMAN AND ENVIRONMENTAL SAMPLES. A COMPENDIUM OF SYSTEMATIC PROCEDURES DESIGNED TO ASSIST IN THE PREVENTION AND CONTROL OF ANALYTICAL PROBLEMS  

EPA Science Inventory

This manual provides the pesticide chemist with a systematic protocol for the quality control of analytical procedures and the problems that arise in the analysis of human or environmental media. It also serves as a guide to the latest and most reliable methodology available for ...

367

Psychological Problems, Protective Factors and Health-Related Quality of Life in Youth Affected by Violence: The Burden of the Multiply Victimised  

ERIC Educational Resources Information Center

This study investigates self-rated mental health in terms of psychological problems, protective factors and health-related quality of life (HRQOL) in a nationally representative sample of adolescents (n = 6813) aged 11-17 involved in violence with varying frequency. Using MANCOVA and ANCOVA, youth with single and multiple histories of violent…

Schlack, Robert; Ravens-Sieberer, Ulrike; Petermann, Franz

2013-01-01

368

Lava Sampling  

USGS Multimedia Gallery

An HVO geologist takes a sample of active lava within a lava tube. The fluid lava sticks to the heavy hammer head at the end of the cable when it is lowered into the swiftly moving lava stream. These samples are analyzed routinely to track changes in lava chemistry. ...

2010-06-18

369

Sampling Development  

ERIC Educational Resources Information Center

Research in developmental psychology requires sampling at different time points. Accurate depictions of developmental change provide a foundation for further empirical studies and theories about developmental mechanisms. However, overreliance on widely spaced sampling intervals in cross-sectional and longitudinal designs threatens the validity of…

Adolph, Karen E.; Robinson, Scott R.

2011-01-01

370

Ultrahigh-Vacuum Sample-Transfer System  

NASA Technical Reports Server (NTRS)

Ultrahigh-vacuum (UHV) sample-transfer system developed features short-term (less than 30 minutes) transfer of samples from atmospheric pressure into sample manipulator within UHV analysis system without significantly degrading system pressure. New system is austere approach to sample transfer, involving no automation. Total cost of system is factor of 10 less than commercially available instruments.

Outlaw, R.; Baugh, B. T.

1985-01-01

371

Word Problems  

NSDL National Science Digital Library

This is the last topic in the series of lessons on math provided by DeafTEC. Gary Blatto-Vallee, a math and science instructor at the National Technical Institute for the Deaf, guides viewers through a variety of mathematical exercises in this DeafTEC video series. All lessons are fully captioned, signed in ASL, and voiced. In this section, three videos are included that show students how to solve word problems of systems of two equations. This section builds on everything students have learned in the previous videos about working with polynomials and exponents as well as methods for solving systems of two equations. See the main Math Video Resources page for an introduction to this video series.

Blatto-Vallee, Gary

2014-08-05

372

Environmental sampling  

SciTech Connect

Environmental Sampling (ES) is a technology option that can have application in transparency in nuclear nonproliferation. The basic process is to take a sample from the environment, e.g., soil, water, vegetation, or dust and debris from a surface, and through very careful sample preparation and analysis, determine the types, elemental concentration, and isotopic composition of actinides in the sample. The sample is prepared and the analysis performed in a clean chemistry laboratory (CCL). This ES capability is part of the IAEA Strengthened Safeguards System. Such a Laboratory is planned to be built by JAERI at Tokai and will give Japan an intrinsic ES capability. This paper presents options for the use of ES as a transparency measure for nuclear nonproliferation.

Puckett, J.M.

1998-12-31

373

Grade 1 Practice Problems: Algebra  

NSDL National Science Digital Library

This page contains thirty-three problems involving algebraic thinking from the Port Angeles School District in Washington state. Links to state GLEs and revised standards are provided. Topics covered include patterns, and concepts of equality and inequality and applications of arithmetic.

2011-01-01

374

Family Problems and Youth Unemployment.  

ERIC Educational Resources Information Center

Examines how family and personal characteristics relate to the employment situation of adolescents (N=995) in Denmark. Results show that parental divorce, parental unemployment (only for males), low parental affective involvement, and adolescent relationship problems were related to youth unemployment, but educational career and work commitment…

de Goede, Martijn; Spruijt, Ed; Maas, Cora; Duindam, Vincent

2000-01-01

375

Sleep Problems in Individuals with Angelman Syndrome  

ERIC Educational Resources Information Center

Prevalence of severe sleep problems and its association with other variables were investigated with 109 individuals who have Angelman syndrome. Severe settling problems, frequent night waking, and early waking were found in 2%, 37%, and 10% of the individuals, respectively. Sleep problems were persistent in this sample. No statistically…

Didden, Robert; Korzilius, Hubert; Smits, Marcel G.; Curfs, Leopold M. G.

2004-01-01

376

Solving Probability Problems Using Monte Carlo Simulation.  

ERIC Educational Resources Information Center

Described is a strategy that allows students to experiment with probability without applying formulas to solve problems. Students are able to intuitively develop concepts of probability before formal definitions and properties. Sample problems are included along with BASIC programs for some of the problems. (KR)

Rudolph, William B.; Tvrdik, Debra

1991-01-01

377

Sampling search-engine results  

Microsoft Academic Search

We consider the problem of efficiently sampling Web search engine query results. In turn, using a small random sample instead of the full set of results leads to efficient approximate algorithms for several applications, such as: Determining the set of categories in a given taxonomy spanned by the search results;Finding the range of metadata values associated to the result set

Aris Anagnostopoulos; Andrei Z. Broder; David Carmel

2005-01-01

378

Students' difficulties with equations involving circuit elements  

NSDL National Science Digital Library

We discuss an investigation exploring students' difficulties with equations involving resistance, capacitance and inductance. We find that introductory physics students have great difficulty understanding, e.g., how the resistance of an ohmic resistor can be written in terms of the potential difference across it and the current through it, but it does not change when the potential difference across the resistor is varied. Similar confusions arose in problems relating to capacitors and inductors. We discuss these difficulties with equations in the context of introductory physics students' performance on questions about circuit elements both in the free-response and multiple-choice formats.

Li, Jing; Singh, Chandralekha

2012-05-15

379

On sampling nonstationary spatial autocorrelated data  

NASA Astrophysics Data System (ADS)

Sampling dependent random variables constituting a nonstationary spatial two-dimensional random process due to the presence of drift is a difficult problem consisting of determining the optimum sampling design and sampling density or number of samples, in order for one to attain a desirable precision as it is expressed by the Mean Square Error (MSE). The complexity of the problem prevents the development of a closed form solution expressing the number of samples needed to attain a given precision. Thus a user friendly FORTRAN program solving this problem for the situation of spherical semivariogram, the equilateral, square and hexagon designs, and no drift, linear, and quadratic, is given.

Yfantis, Evangelos A.; Flatman, George T.

380

Metacognitions in problem gambling.  

PubMed

Problem gambling is heterogeneous in nature, ranging in severity from occasional but problematic gambling episodes, to extreme, impulsive and pervasive gambling behaviour. Problem gambling may be accompanied by a sense of impaired control and can give rise to financial, interpersonal, legal and vocational costs for the sufferer, their families and society. This study investigated the relationship among metacognitions, anxiety, depression and gambling in a sample of problem gamblers. A total of 91 individuals attending gambling treatment services completed a battery of self-report instruments that consisted of the Metacognitions Questionnaire 30 (MCQ-30), the Hospital Anxiety and Depression Scale (HADS) and the South Oaks Gambling Scale (SOGS). Correlation analyses showed that anxiety, depression and metacognitions were positively and significantly correlated with both gambling consequences and behaviour. Hierarchical regression analyses indicated that two metacognitive constructs (negative beliefs about thoughts concerning uncontrollability and danger and beliefs about the need to control thoughts) predicted gambling behaviour independently of anxiety and depression. These findings are consistent with the hypothesis that metacognitions play a role in problem gambling. PMID:20429027

Lindberg, Annika; Fernie, Bruce A; Spada, Marcantonio M

2011-03-01

381

Revisiting the concept of the 'problem young driver' within the context of the 'young driver problem': who are they?  

PubMed

For decades there have been two young driver concepts: the 'young driver problem' where the driver cohort represents a key problem for road safety; and the 'problem young driver' where a sub-sample of drivers represents the greatest road safety problem. Given difficulties associated with identifying and then modifying the behaviour of the latter group, broad countermeasures such as graduated driver licensing (GDL) have generally been relied upon to address the young driver problem. GDL evaluations reveal general road safety benefits for young drivers, yet they continue to be overrepresented in fatality and injury statistics. Therefore it is timely for researchers to revisit the 'problem young driver' concept to assess its potential countermeasure implications. This is particularly relevant within the context of broader countermeasures that have been designed to address the 'young driver problem' Personal characteristics, behaviours and attitudes of 378 Queensland novice drivers aged 17-25 years were explored during their pre-, Learner and Provisional 1 (intermediate) licence as part of a larger longitudinal project. Self-reported risky driving was measured by the Behaviour of Young Novice Drivers Scale (BYNDS), and five subscale scores were used to cluster the drivers into three groups (high risk n=49, medium risk n=163, low risk n=166). High risk 'problem young drivers' were characterised by greater self-reported pre-Licence driving, unsupervised Learner driving, and speeding, driving errors, risky driving exposure, crash involvement, and offence detection during the Provisional period. Medium risk drivers were also characterised by more risky road use than the low risk group. Interestingly problem young drivers appear to have some insight into their high-risk driving, since they report significantly greater intentions to bend road rules in future driving. The results suggest that tailored intervention efforts may need to target problem young drivers within the context of broad countermeasures such as GDL which address the young driver problem in general. Experiences such as crash-involvement could be used to identify these drivers as a preintervention screening measure. PMID:23792613

Scott-Parker, B; Watson, B; King, M J; Hyde, M K

2013-10-01

382

Image correlation and sampling study  

NASA Technical Reports Server (NTRS)

The development of analytical approaches for solving image correlation and image sampling of multispectral data is discussed. Relevant multispectral image statistics which are applicable to image correlation and sampling are identified. The general image statistics include intensity mean, variance, amplitude histogram, power spectral density function, and autocorrelation function. The translation problem associated with digital image registration and the analytical means for comparing commonly used correlation techniques are considered. General expressions for determining the reconstruction error for specific image sampling strategies are developed.

Popp, D. J.; Mccormack, D. S.; Sedwick, J. L.

1972-01-01

383

New Directions in Parent Involvement.  

ERIC Educational Resources Information Center

This book presents findings of a study that identified and analyzed 18 recently developed programs or reform efforts in the United States that stress effective parental involvement. Chapter 1 provides a review of education literature and research on parent involvement from 1945 to 1985 and situates newly emerging efforts within the current climate…

Fruchter, Norm; And Others

384

Intravenous leiomyomatosis with intracardiac involvement.  

PubMed

Intravenous leiomyomatosis with intracardiac involvement is rare. This is a case report of a 52-year-old female with intravenous leiomyomatosis with intracardiac involvement. She was successfully treated with myomatectomy (left renal vein and inferior vena cava), hysterectomy, and bilateral salpingo-oophorectomy under the cardiopulmonary bypass. PMID:24838291

Xia, Meng; Liu, Junxiu; Xiang, Xianhong; Xu, Ming; He, Mian

2014-09-01

385

Tracheobronchial Involvement in Relapsing Polychondritis  

Microsoft Academic Search

Relapsing polychondritis (RPC) is a multisystem disorder of chondromalacia involving any cartilage. Respiratory tract involvement is the greatest threat to life. We report a patient with stenosis of the subglottic trachea and left main bronchus who suddenly ceased breathing. As this patient did not have any other clinical features of RPC, the diagnosis was difficult. CT showed circumferential worm-eaten-like thickening

Yoshio Tsunezuka; Hideo Sato; Hiroshi Shimizu

2000-01-01

386

Parental Involvement and Adolescent Development  

Microsoft Academic Search

A series of structural equation models was specified to examine whether parental involvement predicts adolescents' development, controlling on family socioeconomic statuses, family composition, mothers 'work status, race, and gender Three measures of adolescent development and two dimensions of parental involvement were entered in the equations. The measures of development were grade point average, a standardized achievement test score, and an

Luther B. Otto; Maxine P. Atkinson

1997-01-01

387

Applying Employee Involvement in Schools  

Microsoft Academic Search

This article explores the applicability of employee-involvement approaches to the management of schools. Three approaches are described for organizations in general and then applied to schools in particular. We conclude with a discussion of the design issues facing schools if they were to consider a comprehensive employee-involvement strategy as a means to improve their performance.

Susan Albers Mohrman; Edward E. Lawler; Allan M. Mohrman

1992-01-01

388

Locker Problem  

NSDL National Science Digital Library

A classroom activity (also called 1000 Lockers) aligned to the NCTM and California Standards, to be explored through the use of manipulatives and a ClarisWorks spreadsheet. Students then look for patterns and write the answer algebraically. The problem: imagine you are at a school that still has student lockers. There are 1000 lockers, all shut and unlocked, and 1000 students. Suppose the first student goes along the row and opens every other locker. The second student then goes along and shuts every other locker beginning with number 2. The third student changes the state of every third locker beginning with number 3. (If the locker is open the student shuts it, and if the locker is closed the student opens it.) The fourth student changes the state of every fourth locker beginning with number 4. Imagine that this continues until the thousand students have followed the pattern with the thousand lockers. At the end, which lockers will be open and which will be closed? Why? A a href= /alejandre/frisbie/locker.html teacher lesson plan/a is provided.

Forum, Math; Alejandre, Suzanne

2001-01-01

389

Environmental sample management  

SciTech Connect

The diversity and volume of environmental data required to support CERCLA Remedial Investigation/Feasibility Study at the Oak Ridge National Laboratory (ORNL RI/FS) prompted the development of an automated sample tracking system using bar code technology. Use of bar codes has enhanced both efficiency and accuracy related to data gathering and tracking efforts. The automated system has eliminated a number of problems associated with organizing and maintaining a large, relational environmental data base.

Beeler, D.A. [PEER Consultants, Oak Ridge, TN (United States); Hook, L.A. [Oak Ridge National Lab., TN (United States). Environmental Sciences Div.; Masvidal, A.S. [Bechtel Environmental, Inc., Oak Ridge, TN (United States)

1993-12-31

390

Constructions with Obstructions Involving Arcs.  

ERIC Educational Resources Information Center

Presents six construction problems in which key parts of the figure are made inaccessible, that is, a lake or an obstruction is inserted. Encourages creative thinking while improving problem-solving skills. Students are to show the construction, describe the solution, and verify correctness of the solution. (LDR)

Wood, Dick A.

1993-01-01

391

Social Orientation: Problem Behavior and Motivations Toward Interpersonal Problem Solving Among High Risk Adolescents  

PubMed Central

A model of problematic adolescent behavior that expands current theories of social skill deficits in delinquent behavior to consider both social skills and orientation toward the use of adaptive skills was examined in an ethnically and socioeconomically diverse sample of 113 male and female adolescents. Adolescents were selected on the basis of moderate to serious risk for difficulties in social adaptation in order to focus on the population of youth most likely to be targeted by prevention efforts. Structural equation modeling was used to examine cross-sectional data using multiple informants (adolescents, peers, and parents) and multiple methods (performance test and self-report). Adolescent social orientation, as reflected in perceived problem solving effectiveness, identification with adult prosocial values, and self-efficacy expectations, exhibited a direct association to delinquent behavior and an indirect association to drug involvement mediated by demonstrated success in using problem solving skills. Results suggest that the utility of social skill theories of adolescent problem behaviors for informing preventive and remedial interventions can be enhanced by expanding them to consider adolescents’ orientation toward using the skills they may already possess. PMID:16929380

Kuperminc, Gabriel P.; Allen, Joseph P.

2006-01-01

392

Characteristics of Older Adult Problem Gamblers Calling a Gambling Helpline  

Microsoft Academic Search

Background  Few investigations have characterized groups of older adults with gambling problems, and published reports are currently limited by small samples of older adult problem gamblers. Gambling helplines represent a widespread mechanism for assisting problem gamblers to move into treatment settings. Given data from older adult problem gamblers in treatment, we hypothesized that older as compared with younger adult problem gamblers

Marc N. Potenza; Marvin A. Steinberg; Ran Wu; Bruce J. Rounsaville; Stephanie S. O’Malley

2006-01-01

393

Real jumping gene genetic algorithm (RJGGA) for evolutionary multiobjective optimization problems.  

E-print Network

??Real-world applications often involve the satisfaction of multiple conflicting objectives simultaneously. The problems with two or more objectives are called “multiobjective” problems that usually have… (more)

Ripon, Kazi Shah Nawaz

2006-01-01

394

Airborne atmospheric sampling system  

NASA Technical Reports Server (NTRS)

The atmospheric sampling system developed for use on board commercial airliners as part of the Global Atmospheric Sampling Program (GASP) is described. The automated air-constituent measuring system is installed in a Boeing 747 airliner below the passenger cabin floor near the nose wheel well. It consists of an air sample flow system, composed of air inlet and pressurization systems, computerized data acquisition and system control units which direct system operation in 15 modes, and commercial instruments significantly modified to measure low levels of atmospheric constituents (ozone, water vapor, nitrogen oxides, carbon monoxide, chlorofluoromethanes, particulates, condensation nuclei, sulfates and nitrates). Flight and meteorological data, including air temperature and altitude, are also recorded. The system is designed for servicing at 14-day intervals, and to require a minimum of aircrew involvement.

Gustafsson, U. R. C.; Perkins, P. J.; Nyland, T. W.; Tiefermann, M. W.; Dudzinski, T. J.

1979-01-01

395

[Liver involvement in systemic diseases].  

PubMed

Liver involvement is common in connective tissue disorders and usually asymptomatic. However, it may be symptomatic and cases of fulminant hepatitis have been reported. A diagnosis of specific hepatic involvement needs to rule out drug toxicity, viral hepatitis, or auto-immune liver disease. The large panel of auto-antibodies that is now available to the clinician is helpful to differentiate auto-immune hepatitis and specific liver involvement associated with connective tissue disease. In the latter, the outcome is generally favourable with immunosuppressive treatment. PMID:20934791

Geri, G; Saadoun, D; Cacoub, P

2011-08-01

396

Sampling for area estimation: A comparison of full-frame sampling with the sample segment approach. [Kansas  

NASA Technical Reports Server (NTRS)

The effect of sampling on the accuracy (precision and bias) of crop area estimates made from classifications of LANDSAT MSS data was investigated. Full-frame classifications of wheat and non-wheat for eighty counties in Kansas were repetitively sampled to simulate alternative sampling plants. Four sampling schemes involving different numbers of samples and different size sampling units were evaluated. The precision of the wheat area estimates increased as the segment size decreased and the number of segments was increased. Although the average bias associated with the various sampling schemes was not significantly different, the maximum absolute bias was directly related to sampling unit size.

Hixson, M. M.; Bauer, M. E.; Davis, B. J.

1979-01-01

397

Physics Suite Peer Instruction Problems: Rotational Motion  

NSDL National Science Digital Library

This website contains a series of peer instruction problems on rotational motion, designed to be solved in a classroom setting. The problems are presented with a qualitative question (usually multiple choice) that is carefully constructed to engage student difficulties with fundamental concepts. Students consider the problem individually and contribute their answers using personal response systems (clickers). Students then confer with their cooperative groups and vote again on the correct response. Topics covered include centrifugal force, angular speed, torque, rotational energy, and rotational friction. This problem set is part of the Physics Suite collection, containing sample problems, peer instruction problems, and alternative homework sets.

Redish, Edward F.

2008-08-11

398

Physics Suite Peer Instruction Problems: Dynamics  

NSDL National Science Digital Library

This website contains a series of peer instruction problems on dynamics, designed to be solved in a classroom setting. The problems are presented with a qualitative (usually multiple choice) question that is carefully constructed to engage student difficulties with fundamental concepts. Students consider the problem individually and contribute their answers using personal response systems (clickers). Students then confer with their cooperative groups and vote again on the correct response. Topics covered include force, acceleration, normal force, friction, tension, and motion in two dimensions. This problem set is part of the Physics Suite collection, containing sample problems, peer instruction problems, and alternative homework sets.

Redish, Edward F.

2008-08-11

399

Physics Suite Peer Instruction Problems: Heat & Temperature  

NSDL National Science Digital Library

This website contains a series of peer instruction problems on heat and temperature, designed to be solved in a classroom setting. The problems are presented with a qualitative question (usually multiple choice) that is carefully constructed to engage student difficulties with fundamental concepts. Students consider the problem individually and contribute their answers using personal response systems (clickers). Students then confer with their cooperative groups and vote again on the correct response. Topics covered include heat lost to friction, mixing liquids of different temperatures, and thermal energy. This problem set is part of the Physics Suite collection, containing sample problems, peer instruction problems, and alternative homework sets.

Redish, Edward F.

2008-08-11

400

Health literacy, numeracy, and other characteristics associated with hospitalized patients' preferences for involvement in decision-making  

PubMed Central

Little research has examined the association of health literacy and numeracy with patients' preferred involvement in the problem-solving and decision-making process in the hospital. Using a sample of 1,249 patients hospitalized with cardiovascular disease from the Vanderbilt Inpatient Cohort Study (VICS), we assessed patients' preferred level of involvement using responses to two scenarios of differing symptom severity from the Problem-Solving Decision-Making (PSDM) Scale. Using multivariable modeling, we determined the relationship of health literacy, subjective numeracy, and other patient characteristics with preferences for involvement in decisions, and how this differed by scenario. We found that patients with higher levels of health literacy desired more participation in the problem-solving and decision-making process, as did patients with higher subjective numeracy skills, greater educational attainment, female gender, less perceived social support, or greater health care system distrust (p<0.05 for each predictor in multivariable models). Patients also preferred to participate more in the decision-making process when the hypothetical symptom they were experiencing was less severe (i.e., they deferred more to their physician when the hypothetical symptom was more severe). These findings underscore the role that patient characteristics, especially health literacy and numeracy, play in decisional preferences among hospitalized patients. PMID:25315582

Goggins, KM; Wallston, KA; Nwosu, S; Schildcrout, JS; Castel, L; Kripalani, S

2015-01-01

401

Core sample extractor  

NASA Technical Reports Server (NTRS)

The problem of retrieving and storing core samples from a hole drilled on the lunar surface is addressed. The total depth of the hole in question is 50 meters with a maximum diameter of 100 millimeters. The core sample itself has a diameter of 60 millimeters and will be two meters in length. It is therefore necessary to retrieve and store 25 core samples per hole. The design utilizes a control system that will stop the mechanism at a certain depth, a cam-linkage system that will fracture the core, and a storage system that will save and catalogue the cores to be extracted. The Rod Changer and Storage Design Group will provide the necessary tooling to get into the hole as well as to the core. The mechanical design for the cam-linkage system as well as the conceptual design of the storage device are described.

Akins, James; Cobb, Billy; Hart, Steve; Leaptrotte, Jeff; Milhollin, James; Pernik, Mark

1989-01-01

402

Transportation Accidents Involving Radioactive Materials  

MedlinePLUS

... withstand damage. What are the main dangers of transportation accidents involving radiation? The main dangers of transportation ... the transport container. http://emergency.cdc.gov/radiation TRANSPORTATION ACCIDENTS If you believe you have been exposed, ...

403

University of Delaware: Problem-Based Learning  

NSDL National Science Digital Library

Based at the University of Delaware, this set of peer-tested and vetted educational resources asks the important question: "How can I get my students to think?" Their educational philosophy places a premium on problem-based learning (PBL), which is an instructional method that asks students to work cooperatively in groups in order to seek solutions to real world problems. First-time visitors can take a look at some sample PBL problems. These sample problems include several group exercises that deal with everything from household wiring to a case study problem in molecular evolution. College instructors will want to definitely visit the "PBL Courses and Syllabi" area, where they can take a look at sample syllabi that draw inspiration from the problem-based learning perspective. Finally, visitors can also browse through the PBL Clearinghouse and look over a list of related educational sites.

404

A multiscale framework for Bayesian inference in elliptic problems  

E-print Network

The Bayesian approach to inference problems provides a systematic way of updating prior knowledge with data. A likelihood function involving a forward model of the problem is used to incorporate data into a posterior ...

Parno, Matthew David

2011-01-01

405

Drug Hypersensitivity Reactions Involving Skin  

Microsoft Academic Search

Immune reactions to drugs can cause a variety of diseases involving the skin, liver, kidney, lungs, and other organs. Beside\\u000a immediate, IgE-mediated reactions of varying degrees (urticaria to anaphylactic shock), many drug hypersensitivity reactions\\u000a appear delayed, namely hours to days after starting drug treatment, showing a variety of clinical manifestations from solely\\u000a skin involvement to fulminant systemic diseases which may

Oliver Hausmann; Benno Schnyder; Werner J. Pichler

406

Pulmonary involvement in rheumatoid arthritis  

Microsoft Academic Search

The primary objective of this investigation was to assess the relationships between clinical characteristics, lung involvement, and frequency of pulmonary involvement in rheumatoid arthritis (RA). Using high-resolution computed tomography (HRCT) and pulmonary function tests (PFT), we prospectively evaluated 52 patients with RA (eight males and 44 females, mean age 53.6 years). The HRCT was abnormal in 35 patients (67.3%), the most

Ayhan Bilgici; H. Ulusoy; O. Kuru; Ç. Çelenk; M. Ünsal; M. Danac?

2005-01-01

407

Sampling apparatus  

DOEpatents

A sampling apparatus is provided for sampling substances from solid surfaces. The apparatus includes first and second elongated tubular bodies which telescopically and sealingly join relative to one another. An absorbent pad is mounted to the end of a rod which is slidably received through a passageway in the end of one of the joined bodies. The rod is preferably slidably and rotatably received through the passageway, yet provides a selective fluid tight seal relative thereto. A recess is formed in the rod. When the recess and passageway are positioned to be coincident, fluid is permitted to flow through the passageway and around the rod. The pad is preferably laterally orientable relative to the rod and foldably retractable to within one of the bodies. A solvent is provided for wetting of the pad and solubilizing or suspending the material being sampled from a particular surface.

Gordon, Norman R. (Kennewick, WA); King, Lloyd L. (Benton, WA); Jackson, Peter O. (Richland, WA); Zulich, Alan W. (Bel Air, MD)

1989-01-01

408

SST Sample Characterization Analysis of Archive Samples 102-C, 105-C, and 106-C  

SciTech Connect

A substantial effort is planned to be initiated at the Hanford Site regarding the characterization of 149 single-shell tanks (SSTs) containing the byproducts of reprocessing during the 1950s and 1960s. Sampling and analysis, in distinct phases, are planned to involve laboratory investigations to determine both chemical and radionuclide inventories, so that waste disposal decisions can be developed. During 1989, trial analyses were performed on four archived samples from SSTs at the Pacific Northwest Laboratory using established U.S. Environmental Protection Agency (EPA) protocols and radiochemical procedures. The analysis of the archived SST waste material provides three important types of data for use in planning Phase I-A and Phase 1-B sample analysis. The types of data served as input to I) fi na 1 i zing the waste samp 1 e analysis procedures and methods and identify where procedure developmen~ may be needed, 2) evaluating the impact of normal paraffin hydrocarbon (NPH) lubricant {used in field sampling) on extracting inorganics or radionuclides from the SST sample, and 3) identifying trends in amounts of occupational radiation exposure expected from performing the various analysis procedures. Overall, the results are qualitative in nature, and the conclusions given are to be used with appropriate respect for the limitations of small amounts of data from four samples used in development processes. The results of the Phase I-A and I-B sample analysis will provide essential data for method performance for use in finalizing Phase I-C planning and methods development scope. Section 2.0, Inorganic Analysis, encompasses sample preparation, sample analysis, identification of methods performance limitations, and possible alternatives. Performance of the inorganic analytical methods was evaluated and changes were made to some of the procedures. In some cases, inductively coupled plasma-atomic emission spectroscopy (referred to in this report as ICP) did not provide the levels of accuracy and precision usually required for EPA work due to interference by other elements. In these cases, other methods are suggested as appropriate for trial as alternatives. In all cases, duplicates, spikes, and blanks were used to establish performance of the methods for the specific waste matrix. Results focused on problems in using the methods tested on the samples, the suitability of the ICP method of determining EP Toxicity metal ions and 22 EPA pollutant metal ions, and the suitability of cold vapor atomic absorption (CVAA) for mercury determinations. Problems areas identified are ICP spectral corrections, poor reproducibility from water leach and EP Toxicity methods, and adjustments needed for mercury analysis by CVAA. Section 3.0, Organics Analysis, details two screening procedures [total organic carbon (TOC) and gas chromatography (GC)], extraction procedures and related problems, surrogate spiking to test extraction efficiencies and matrix effects, and semivolatile organics via GC/mass spectroscopy (MS). The results show that the GC/MS is vulnerable to fouling and overload and that a combination of dilution and perhaps acidification are required to provide acceptable results. NPH and silicone-based lubricants from the sampling process impact the semivolatile analysis; however, with some modification the semivolatile method based on EPA SOW 288 can be used. Section 4.0, Radionuclide Analysis, evaluates procedures used to measure the radionuclides that might be found in the SST tank waste samples and establishes the level of accuracy and precision that can be expected. These data reveal that additional procedure development is needed in order to measure all of the radionuclides listed in Table 4-14 of the Waste Characterization Plan. In addition, the archive samples analyzed may not be representative of the tank population and considerable adaptation of the radiochemical procedures may be necessary to perform the desired measurements. NPH tests were conducted to determine whether the NPH from the field sampling process extracted significan

Hara, F. T.; Kaye, J. H.; Steele, R. T.; Stromatt, R. W.; Thomas, D. L.; Urie, M. W.

1990-04-01

409

How patient involvement in care is improving service provision.  

PubMed

An emphasis on public and service-user involvement runs through the core initiatives of the modernisation agenda as outlined in The NHS Plan (Department of Health, 2000) and related policy documents. This article discusses problems that have prevented the NHS from being responsive to the views of service users and what the implementation of policies can offer in terms of overcoming such problems. In addition, initiatives and other ways of identifying and delivering public or patient needs are considered. PMID:15137311

Kaur, Baljinder

410

Problem 130: Nurse Rostering Matthew Grum  

E-print Network

Problem 130: Nurse Rostering Matthew Grum Dept. Computer Science, The University of York July 2004 Given a number of nurses, the rostering problem involves assigning a shift to each nurse on each day number of nurses on duty for each shift. Every nurse must get one day off and work one overnight shift

St Andrews, University of

411

Detached shock problem and related topics  

Microsoft Academic Search

A finite difference method for solving the Cauchy or initial value problem for elliptic partial differential equations as introduced in (1) and further developed in (2) will be the principal topic discussed here. Involved in this discussion, also, will be certain basic notions related to the (analytic) stability of such problems as developed in (2) and (3). Contributions to the

H. M. Lieberstein

1959-01-01

412

Using Programmable Calculators to Solve Electrostatics Problems.  

ERIC Educational Resources Information Center

Provides a simple routine which allows first-year physics students to use programmable calculators to solve otherwise complex electrostatic problems. These problems involve finding electrostatic potential and electric field on the axis of a uniformly charged ring. Modest programing skills are required of students. (DH)

Yerian, Stephen C.; Denker, Dennis A.

1985-01-01

413

Understanding the transmission access and wheeling problem  

SciTech Connect

Institutional and regulatory changes in the uses of the nation's bulk power transmission systems that fail to recognize the technical complexity of the systems and the planning and operating problems involved can be disruptive of system reliability and of economic incentive needed for new facilities and technology. This article reviews basic technical and economic considerations connected with the transmission access problem. 2 figures.

Casazza, J.A.

1985-10-31

414

Problem Solved: How To Coach Cognition.  

ERIC Educational Resources Information Center

When faced with real-world problems, students devise accurate, logical, and creative solutions using skills connecting to different subject areas. Students are intrigued by assignments involving preservation of species and design of environmentally friendly products and transit systems. Problem-based learning depends on coaching, modeling, and…

Krynock, Karoline; Robb, Louise

1999-01-01

415

How to Generate Good Profit Maximization Problems  

ERIC Educational Resources Information Center

In this article, the author considers the merits of two classes of profit maximization problems: those involving perfectly competitive firms with quadratic and cubic cost functions. While relatively easy to develop and solve, problems based on quadratic cost functions are too simple to address a number of important issues, such as the use of…

Davis, Lewis

2014-01-01

416

Taking "From Scratch" out of Problem Solving  

ERIC Educational Resources Information Center

Solving problems and creating processes and procedures from the ground up has long been part of the IT department's way of operating. IT staffs will continue to encounter new problems to solve and new technologies to be implemented. They also must involve their constituents in the creation of solutions. Nonetheless, for many issues they no longer…

Brown, Wayne

2007-01-01

417

An analysis of incubation effects in problem solving using a computer-administered assessment tool  

E-print Network

problem solver could benefit from an interruption that involves stimuli changing visually and spatially and that also demands some degree of cognitive involvement. Although the present study did not demonstrate effects of interaction between the problem...

Yoo, Sung Ae

2009-05-15

418

Approximate resolution of hard numbering problems  

SciTech Connect

We present a new method for estimating the number of solutions of constraint satisfaction problems. We use a stochastic forward checking algorithm for drawing a sample of paths from a search tree. With this sample, we compute two values related to the number of solutions of a CSP instance. First, an unbiased estimate, second, a lower bound with an arbitrary low error probability. We will describe applications to the Boolean Satisfiability problem and the Queens problem. We shall give some experimental results for these problems.

Bailleux, O.; Chabrier, J.J. [CRID Universite de Bourgogne, Dijon (France)

1996-12-31

419

Problem Solving Framework Read the problem carefully.  

E-print Network

Problem Solving Framework Read the problem carefully. Draw a useful picture (sketch) that shows how identified in Step 1. 1. Understand the Problem 2. Analyze the Problem 3. Construct a Solution Apply constraint equations) to eliminate the unwanted unknowns? Use math (algebra/calculus) to solve for target

Minnesota, University of

420

IRSATOL -Irregular Sampling of Band-limited Signals TOOLBOX  

E-print Network

-called " Irregular Sampling Problem for Band-limited Signals"'. Applications to wavelet theory are in view but have simple and is known as Shannon's sampling theorem. It is natural to expect that irregular sampling values

Feichtinger, Hans Georg

421

Sample Sizes for Usability Studies: Additional Considerations  

Microsoft Academic Search

ABSTRACT Recently, Virzi (1992) presented data that support three claims regarding sample sizes for usability studies. The claims were (1) observing four or five participants will allow a usability practitioner to discover 80% of a product's usability problems, (2) observing additional participants will reveal fewer and fewer new usability problems, and (3) more severe usability problems are easier to detect

James R. Lewis

422

Using Centrality of Concept Maps as a Measure of Problem Space States in Computer-Supported Collaborative Problem Solving  

ERIC Educational Resources Information Center

Problem solving likely involves at least two broad stages, problem space representation and then problem solution (Newell and Simon, Human problem solving, 1972). The metric centrality that Freeman ("Social Networks" 1:215-239, 1978) implemented in social network analysis is offered here as a potential measure of both. This development research…

Clariana, Roy B.; Engelmann, Tanja; Yu, Wu

2013-01-01

423

Sensitivity Analysis for Activation Problems  

NASA Astrophysics Data System (ADS)

A study has been made as to how to develop further the techniques for sensitivity analysis used by Fispact-II. Fispact-II is a software suite for the analysis of nuclear activation and transmutation problems, developed for all nuclear applications. The software already permits sensitivity analysis to be performed by Monte Carlo sampling, and a faster uncertainty analysis is made possible by a powerful graph-based approach which generates a reduced set of nuclides on pathways leading to significant contributions to radiological quantities. The peculiar aspects of the sensitivity analysis problem for activation are the large number, typically thousands, of rate equation parameters(decay rates and reaction cross-sections) which all have some degree of associated error, and the fact that activity as a function of time varies as a sum of exponentials, so appears discontinuous as rate parameters are varied unless the sampling frequency is impractically fast. Nevertheless, Monte Carlo sampling is a generic approach and it is therefore conceivable that techniques more targeted to the activation problem might be beneficial. Moreover, recent theoretical developments have highlighted the importance of a two-stage approach to mathematically similar problems, where in the first stage, information is collected about the global behaviour of the problem, such as the identification of the rate parameters which cause the greatest variation in dose or nuclear activity, before a second stage examines a problem with its scope restricted by the information from the first. In the second stage, for example, Quasi-Monte Carlo sampling may be used in a restricted parameter space. The current work concentrates on the first stage and consists of a review of possible techniques with a detailed examination of the most promising pathways reduction approach, examined directly using Fispact-II. All the evidence obtained demonstrates the strong potential of this approach.

Arter, Wayne; Morgan, Guy

2014-06-01

424

DIAMONDS: high-DImensional And multi-MOdal NesteD Sampling  

NASA Astrophysics Data System (ADS)

DIAMONDS (high-DImensional And multi-MOdal NesteD Sampling) provides Bayesian parameter estimation and model comparison by means of the nested sampling Monte Carlo (NSMC) algorithm, an efficient and powerful method very suitable for high-dimensional and multi-modal problems; it can be used for any application involving Bayesian parameter estimation and/or model selection in general. Developed in C++11, DIAMONDS is structured in classes for flexibility and configurability. Any new model, likelihood and prior PDFs can be defined and implemented upon a basic template.

Corsaro, Enrico; De Ridder, Joris

2014-10-01

425

Parental involvement and mental well-being of Indian adolescents.  

PubMed

This study examined the association between parental involvement and mental well being among the 6721 school going adolescents aged 13 to 15 years who participated in Indias nationally representative Global School based Student Health Survey (GSHS) in 2007. Parental involvement (homework checking, parental understanding of their childrens problems, and parental knowledge of their childrens freetime activities) was reported by students to decrease with age, while poor mental health (loneliness, insomnia due to anxiety, and sadness and hopelessness) increased with age. Age adjusted Logistic regression models showed that high levels of reported parental involvement were significantly associated with a decreased likelihood of poor mental health. PMID:22728626

Hasumi, Takahiro; Ahsan, Fatimah; Couper, Caitlin M; Aguayo, Jose L; Jacobsen, Kathryn H

2012-11-01

426

Cardiac involvement in Wegener's granulomatosis.  

PubMed Central

Wegener's granulomatosis is a systemic inflammatory disorder of unknown aetiology. The protean clinical presentations depend on the organ(s) involved and the degree of progression from a local to a systemic arteritis. The development of serological tests (antieutrophil cytoplasmic antibodies) allows easier diagnosis of a disease whose incidence is increasing. This is particularly helpful where the presentation is not classic--for example "overlap syndromes"--or where the disease presents early in a more localised form. This is true of cardiac involvement, which is traditionally believed to be rare, but may not be as uncommon as has hitherto been thought (< or = 44%). This involvement may be subclinical or the principal source of symptoms either in the form of localised disease or as part of a systemic illness. Pericarditis, arteritis, myocarditis, valvulitis, and arrhythmias are all recognised. Wegener's granulomatosis should therefore be considered in the differential diagnosis of any non-specific illness with cardiac involvement. This includes culture negative endocarditis, because Wegener's granulomatosis can produce systemic upset with mass lesions and vasculitis. Echocardiography and particularly transoesophageal echocardiography can easily identify and delineate cardiac and proximal aortic involvement and may also be used to assess response to treatment. Images PMID:7696016

Goodfield, N. E.; Bhandari, S.; Plant, W. D.; Morley-Davies, A.; Sutherland, G. R.

1995-01-01

427

Problem Solving: Bubble Gum Contest  

NSDL National Science Digital Library

This professional development video clip presents students engaged in The Common Core Practice Standard #1âMake sense of problems and persevere in solving them. The learners gather data for a bubble gum contest, as part of a larger activity involving recording data and writing up results. Students understand the problem and persevere with the task as they independently go to other classrooms to conduct their survey. Additional resources include a video transcript, teaching tips, and a link to a professional development reflection activity based upon the video.

Boston, Wghb

2013-01-01

428

Calculator solves pipe flow problems  

SciTech Connect

For facilitating pipe-flow calculations that involve the horizontal flow of constant-density fluids, a simple program tailored to the TI-59 hand-held calculator uses the Darcy pressure-drop formula (modified for expressing the friction factor) to compute the unknown parameter needed to solve the fluid problem. Instead of several friction-factor equations applicable only in the individual flow regimes, the program uses a single, full-range friction-factor equation with three sets of coefficients to suit the conditions of the problem.

Verma, C.P.

1980-07-28

429

Psychological needs, purpose in life, and problem video game playing among Chinese young adults.  

PubMed

The negative impacts of excessive and problematic video game playing on both children and adults are attracting increasing concern. Based on self-determination theory (SDT; Ryan & Deci, 2000), this study hypothesized that the three basic psychological needs of autonomy, competence, and relatedness are positively associated with purpose in life, which in turn acts as a protective factor against problem video game playing among Chinese young adult players. Through a questionnaire survey with a sample of 165 Chinese adults aged between 18 and 30 years (mean age?=?22.7 years), we found that perceived autonomy, competence, relatedness, and purpose in life were all negatively correlated with problem game playing. The demographic and psychological factors explained 38% of the variances of problem game playing. Specifically, gender, perceived relatedness, and purpose in life emerged as the three most salient predictors of problem game playing among the Chinese young adults. The mediating role of purpose in life was evidenced and it was found that purpose in life mediated the influences of the psychological needs proposed by SDT on problem game playing. Moreover, young men were significantly more susceptible to problem game playing than their female counterparts. To conclude, psychological needs and purpose in life influenced Chinese young adults' vulnerability to problem game playing directly or indirectly. Intervention programs that encourage social involvement and voluntary work, as well as counseling service that helps clients to search for life purpose, are suggested for intervening in problem game playing among Chinese young adults. PMID:22506646

Wu, Anise M S; Lei, Lamis L M; Ku, Lisbeth

2013-01-01

430

PLANT PROBLEM CLINIC & NEMATODE ASSAY LAB SUPPLIES ORDER FORM  

E-print Network

PLANT PROBLEM CLINIC & NEMATODE ASSAY LAB SUPPLIES ORDER FORM Type the name of your County@clemson.edu or sprsn@clemson.edu REQUESTING OFFICE/COUNTY County Name: PLANT PROBLEM CLINIC SUPPLIES ITEM No. Requested Plant Problem Clinic Sampling Guidelines Plastic Sample Bags: (10 per Bundle) Small Large Order

Duchowski, Andrew T.

431

Linear Programming brewer's problem  

E-print Network

practical problem-solving model · reduction: design algorithms, prove limits, classify problems · NP gears · from linear/quadratic to polynomial/exponential scale · from individual problems to problem

Sedgewick, Robert

432

[Heart involvement in Friedreich's ataxia.  

PubMed

Friedreich's ataxia is a rare hereditary disease and although the gene defect has already been identified as a deficiency of the mitochondrial protein frataxin, the pathophysiology is still unknown. Although a multisystem disorder organ involvement is predominantly neurological. Besides the characteristic features of spinocerebellar ataxia the heart is frequently also affected. Cardiac involvement typically manifests as hypertrophic cardiomyopathy, which can progress to heart failure and death. So far most research has focused on the neurological aspects and cardiac involvement in Friedreich's ataxia has not been systematically investigated. Thus, a better understanding of the progression of the cardiomyopathy, cardiac complications and long-term cardiac outcome is warranted. Although no specific treatment is available general cardiac therapeutic options for cardiomyopathy should be considered. The current review focuses on clinical and diagnostic features of cardiomyopathy and discusses potential therapeutic developments for Friedreich's ataxia. PMID:24848865

Weidemann, F; Scholz, F; Florescu, C; Liu, D; Hu, K; Herrmann, S; Ertl, G; Störk, S

2014-05-23

433

Resource Activation Patterns In Expert Problem Solving  

NSDL National Science Digital Library

This paper describes the analysis of video recordings of physics experts solving novel problems involving solar cells, which involved such advanced physics topics as complex circuits and semiconductors. By performing a fine grained analysis using a resource based model of cognition, we determined what resources experts use while reasoning in the current context and how they used them. By analyzing critical events in the problem solving process, we searched for meaningful patterns of resource activation to help gain insight into expert problem solving processes.

Jones, Darrick C.; Malysheva, Marina; Richards, Aj; Planinå¡ic, Gorazd; Etkina, Eugenia

2014-01-31

434

E#ciently Determine the Starting Sample Size for Progressive Sampling  

E-print Network

E#ciently Determine the Starting Sample Size for Progressive Sampling Baohua Gu # Bing Liu, how to set the starting sample size for PS is still an open problem. We show that an improper starting sample size can still make PS expensive in computation due to running the learning algorithm on a large

Liu, Bing

435

Sampling Strategy  

NASA Technical Reports Server (NTRS)

Three locations to the right of the test dig area are identified for the first samples to be delivered to the Thermal and Evolved Gas Analyzer (TEGA), the Wet Chemistry Lab (WCL), and the Optical Microscope (OM) on NASA's Phoenix Mars Lander. These sampling areas are informally labeled 'Baby Bear', 'Mama Bear', and 'Papa Bear' respectively. This image was taken on the seventh day of the Mars mission, or Sol 7 (June 1, 2008) by the Surface Stereo Imager aboard NASA's Phoenix Mars Lander.

The Phoenix Mission is led by the University of Arizona, Tucson, on behalf of NASA. Project management of the mission is by NASA's Jet Propulsion Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin Space Systems, Denver.

2008-01-01

436

SAMPLES Program  

NSDL National Science Digital Library

The objective of the SAMPLES (Sandia Agile MEMS Prototyping, Layout Tools, Education and Services) Program is to enable customers to develop their own innovative products by leveraging advanced design, fabrication, and characterization technologies originally developed for National Laboratory applications. Participants can attend short courses, design new devices, and have those designs fabricated in our state-of-the-art fabrication facility. Additional cost-effective services are also available.

Hanselmann, Kathryn

2009-07-21

437

Bias Sampling  

NSDL National Science Digital Library

In this statistics lesson on bias sampling students conduct a poll of specific populations within their school to determine recommendations for homework policies. Each of three groups is assigned a population to survey and then reports their conclusions to the class. Students will then determine how to improve their survey in order to get unbiased results. A student worksheet for questions and a student template for a letter to the principal are included.

2012-01-01

438

Mixed Methods Sampling: A Typology with Examples  

ERIC Educational Resources Information Center

This article presents a discussion of mixed methods (MM) sampling techniques. MM sampling involves combining well-established qualitative and quantitative techniques in creative ways to answer research questions posed by MM research designs. Several issues germane to MM sampling are presented including the differences between probability and…

Teddlie, Charles; Yu, Fen

2007-01-01

439

Problem Solving Information  

NSDL National Science Digital Library

This page provides a summary of five topics on problems solving: What is a Problem?, What is Problem Solving?, Problem Solving Strategies, Why Teach Problem Solving?, Organizing the Teaching of Problem Solving and a reference section. Users can read more detailed information by accessing the 'More Information' link under each heading.

2014-01-01

440

Reentry challenges facing women with mental health problems.  

PubMed

Women entering the correctional system represent a population at high risk for mental health and the body of research on the mental health needs of women offenders is growing. These mental health problems pose challenges for women at every stage of the criminal justice process, from arrest to incarceration to community reentry and reintegration. In this article, we examined mental health status among a sample of 142 women leaving confinement and the role that mental health problems played in shaping their reentry outcomes using data collected between 2002 and 2005 in Houston, Texas. In the year after leaving prison, women with mental health problems reported poorer health, more hospitalizations, more suicidal thoughts, greater difficulties securing housing and employment, more involvement in criminal behavior, and less financial support from family than women with no indication of mental health problems. However, mental health status did not increase the likelihood of substance use relapse or reincarceration. The article concludes with a discussion of recommendations for improved policy and practice. PMID:25190220

Visher, Christy A; Bakken, Nicholas W

2014-01-01

441

Inner-City African American Parental Involvement in Elementary Schools: Getting beyond Urban Legends of Apathy  

ERIC Educational Resources Information Center

Parental involvement in schools is a national priority for both educators and researchers to promote the successful schooling of contemporary youth. Contemporary parental involvement research has produced some promising findings, but parental involvement efforts with inner-city African Americans are currently limited by problems of research…

Abdul-Adil, Jaleel K.; Farmer, Alvin David, Jr.

2006-01-01

442

Therapist Focus on Parent Involvement in Community-Based Youth Psychotherapy  

ERIC Educational Resources Information Center

Parent involvement in the treatment of childhood disruptive behavior problems is a critical component of effective care. Yet little is known about the amount of time therapists are involving parents in treatment and factors that predict therapists' efforts to involve parents in routine care. The purpose of this study is to examine therapists'…

Haine-Schlagel, Rachel; Brookman-Frazee, Lauren; Fettes, Danielle L.; Baker-Ericzen, Mary; Garland, Ann F.

2012-01-01

443

Calculator solves pipe flow problems  

Microsoft Academic Search

For facilitating pipe-flow calculations that involve the horizontal flow of constant-density fluids, a simple program tailored to the TI-59 hand-held calculator uses the Darcy pressure-drop formula (modified for expressing the friction factor) to compute the unknown parameter needed to solve the fluid problem. Instead of several friction-factor equations applicable only in the individual flow regimes, the program uses a single,

1980-01-01

444

Effectiveness of Family Support Group Involvement in Adult Day Care.  

ERIC Educational Resources Information Center

Conducted group meetings with adult children caring for older relatives at two Chicago area adult day care centers. Sessions focused on problems common to caregivers, information on the aging process, and available resources to assist in caregiving. Caregivers benefited more from the sessions when the administrator and staff were involved and…

Dilworth-Anderson, Peggye

1987-01-01

445

Involving Hispanic Parents in Improving Educational Opportunities for Their Children.  

ERIC Educational Resources Information Center

Traditionally, school personnel have expressed concern about the relatively poor record of involving Hispanic parents in schools. The root of the problem is that many immigrant and migrant Hispanic parents cherish beliefs and expectations different from those held by schools and by the parents whom schools most frequently engage. This chapter…

Sosa, Alicia Salinas

446

An Examination of Family-Involved Approaches to Alcoholism Treatment.  

ERIC Educational Resources Information Center

Introduces the development and theoretical underpinnings of family-involved treatment for alcoholism. Describes several interventions from the family therapy literature with an emphasis on behavioral techniques. Outlines efficacy research and considers some problems with the family approach. (Contains 42 references.) (GCP)

Chan, James G.

2003-01-01

447

Optimization and geophysical inverse problems  

SciTech Connect

A fundamental part of geophysics is to make inferences about the interior of the earth on the basis of data collected at or near the surface of the earth. In almost all cases these measured data are only indirectly related to the properties of the earth that are of interest, so an inverse problem must be solved in order to obtain estimates of the physical properties within the earth. In February of 1999 the U.S. Department of Energy sponsored a workshop that was intended to examine the methods currently being used to solve geophysical inverse problems and to consider what new approaches should be explored in the future. The interdisciplinary area between inverse problems in geophysics and optimization methods in mathematics was specifically targeted as one where an interchange of ideas was likely to be fruitful. Thus about half of the participants were actively involved in solving geophysical inverse problems and about half were actively involved in research on general optimization methods. This report presents some of the topics that were explored at the workshop and the conclusions that were reached. In general, the objective of a geophysical inverse problem is to find an earth model, described by a set of physical parameters, that is consistent with the observational data. It is usually assumed that the forward problem, that of calculating simulated data for an earth model, is well enough understood so that reasonably accurate synthetic data can be generated for an arbitrary model. The inverse problem is then posed as an optimization problem, where the function to be optimized is variously called the objective function, misfit function, or fitness function. The objective function is typically some measure of the difference between observational data and synthetic data calculated for a trial model. However, because of incomplete and inaccurate data, the objective function often incorporates some additional form of regularization, such as a measure of smoothness or distance from a prior model. Various other constraints may also be imposed upon the process. Inverse problems are not restricted to geophysics, but can be found in a wide variety of disciplines where inferences must be made on the basis of indirect measurements. For instance, most imaging problems, whether in the field of medicine or non-destructive evaluation, require the solution of an inverse problem. In this report, however, the examples used for illustration are taken exclusively from the field of geophysics. The generalization of these examples to other disciplines should be straightforward, as all are based on standard second-order partial differential equations of physics. In fact, sometimes the non-geophysical inverse problems are significantly easier to treat (as in medical imaging) because the limitations on data collection, and in particular on multiple views, are not so severe as they generally are in geophysics. This report begins with an introduction to geophysical inverse problems by briefly describing four canonical problems that are typical of those commonly encountered in geophysics. Next the connection with optimization methods is made by presenting a general formulation of geophysical inverse problems. This leads into the main subject of this report, a discussion of methods for solving such problems with an emphasis upon newer approaches that have not yet become prominent in geophysics. A separate section is devoted to a subject that is not encountered in all optimization problems but is particularly important in geophysics, the need for a careful appraisal of the results in terms of their resolution and uncertainty. The impact on geophysical inverse problems of continuously improving computational resources is then discussed. The main results are then brought together in a final summary and conclusions section.

Barhen, J.; Berryman, J.G.; Borcea, L.; Dennis, J.; de Groot-Hedlin, C.; Gilbert, F.; Gill, P.; Heinkenschloss, M.; Johnson, L.; McEvilly, T.; More, J.; Newman, G.; Oldenburg, D.; Parker, P.; Porto, B.; Sen, M.; Torczon, V.; Vasco, D.; Woodward, N.B.

2000-10-01

448

Fluid involvement in normal faulting  

Microsoft Academic Search

Evidence of fluid interaction with normal faults comes from their varied role as flow barriers or conduits in hydrocarbon basins and as hosting structures for hydrothermal mineralisation, and from fault-rock assemblages in exhumed footwalls of steep active normal faults and metamorphic core complexes. These last suggest involvement of predominantly aqueous fluids over a broad depth range, with implications for fault

Richard H. Sibson

2000-01-01

449

Promoting Active Involvement in Classrooms  

ERIC Educational Resources Information Center

This article presents a rationale for using active involvement techniques, describes large- and small-group methods based on their documented effectiveness and applicability to K-12 classrooms, and illustrates their use. These approaches include ways of engaging students in large groups (e.g., unison responses, response cards, dry-erase boards,…

Conderman, Greg; Bresnahan, Val; Hedin, Laura

2012-01-01

450

Dupuytren's disease involving Guyon's canal.  

PubMed

Ectopic localization of Dupuytren's contracture is extremely rare. To the best of our knowledge, there have been only six cases reported in the literature. The authors present a case with Dupuytren's contracture involving Guyon's canal where the patient had limited wrist range of motion and ulnar neuropathy. PMID:24874274

Juvenspan, M; Schlur, C; Thomsen, L; Colom, A; Audren, J-L

2014-06-01

451

Involvement in Subject Learning Scale.  

ERIC Educational Resources Information Center

The Involvement in Subject Learning Scale (ISLS) was developed and validated as an educational outcome measure to be used in assessing higher education quality. The origins and development of the scale, its factor analysis, potential applications, limitations, and pilot use in France and Quebec (Canada) are described. The instrument is appended.…

Bujold, Neree; Saint-Pierre, Henri; Bhushan, Vidya

1997-01-01

452

Creative Involvement with the Media.  

ERIC Educational Resources Information Center

Many suggestions are given for directly involving students in the various forms of the media. Instamatic cameras, tape recorders, 35mm cameras, videotape recorders, Super 8 cameras, phonograph players, and film projectors are some pieces of equipment typically available to schools which can be used creatively by students. In addition to making…

Goodkind, Thomas B.

1972-01-01

453

Predictors of Residence Hall Involvement  

ERIC Educational Resources Information Center

Residence hall students' (N = 1,186, 52% male, 90% White, 66% freshmen) involvement in their living community is influenced significantly by precollege student characteristics (gender, ethnicity), classification, attitudes (toward hall director, house cabinet, academic comfort, social environment, group study), and environmental variables (noise,…

Arboleda, Ana; Wang, Yongyi; Shelley, Mack C., II; Whalen, Donald F.

2003-01-01

454

Parent Involvement as Ritualized Practice  

ERIC Educational Resources Information Center

This article examines parent involvement (PI) as a ritual system using Turner's concept of root paradigms. Through a twofold analysis, I argue that the highly ritualized nature of PI practices creates a group identity among mainstream parents and schools that marginalizes diverse families. First, I point out three root paradigms in the ritual…

Doucet, Fabienne

2011-01-01

455

Acceptance sampling using judgmental and randomly selected samples  

SciTech Connect

We present a Bayesian model for acceptance sampling where the population consists of two groups, each with different levels of risk of containing unacceptable items. Expert opinion, or judgment, may be required to distinguish between the high and low-risk groups. Hence, high-risk items are likely to be identifed (and sampled) using expert judgment, while the remaining low-risk items are sampled randomly. We focus on the situation where all observed samples must be acceptable. Consequently, the objective of the statistical inference is to quantify the probability that a large percentage of the unsampled items in the population are also acceptable. We demonstrate that traditional (frequentist) acceptance sampling and simpler Bayesian formulations of the problem are essentially special cases of the proposed model. We explore the properties of the model in detail, and discuss the conditions necessary to ensure that required samples sizes are non-decreasing function of the population size. The method is applicable to a variety of acceptance sampling problems, and, in particular, to environmental sampling where the objective is to demonstrate the safety of reoccupying a remediated facility that has been contaminated with a lethal agent.

Sego, Landon H.; Shulman, Stanley A.; Anderson, Kevin K.; Wilson, John E.; Pulsipher, Brent A.; Sieber, W. Karl

2010-09-01

456

Implementing change: involving employees to improve outcomes.  

PubMed

Increasingly, pharmacy workplaces are larger organizations that rely on policy and clinical guidelines to direct professional practice. Often, cost-cutting, profit-making, service-improving, and process-streamlining ideas are needed but difficult to identify or implement. By involving employees more closely in the change process using participative management (PM), managers reap tremendous reward. PM focuses on employee collaboration to develop and implement consistent, effective policies and procedures. This process recognizes employees' creative, emotional and intellectual needs and often improves the organization's public face as well. In addition, consumers perceive this approach to be socially responsible management. Managers can implement PM in a number of ways, applying it to problems or processes. PM has some pitfalls, but overall, if the workplace culture adapts to accommodate its principles, PM usually provides numerous benefits for organizations, their employees, and their customers. PMID:25369185

Wick, Jeannette Y

2014-11-01

457

Testing for Upper Outliers in Gamma Sample  

Microsoft Academic Search

The problem of multiple upper outlier detection in gamma sample is considered. Balasooriya and Gadag (1994) proposed a location and scale invariant test based on the test statistic Zk for testing the k upper outliers in two-parameter exponential sample. In this article, the test statistic is extended for gamma sample and the null distribution of the statistic is obtained. A

Nirpeksh Kumar; S. Lalitha

2012-01-01

458

On near-uniform URL sampling  

Microsoft Academic Search

We consider the problem of sampling URLs uniformly at random from the Web. A tool for sampling URLs uniformly can be used to estimate various properties of Web pages, such as the fraction of pages in various Internet domains or written in various languages. Moreover, uniform URL sampling can be used to determine the sizes of various search engines relative

Monika Rauch Henzinger; Allan Heydon; Michael Mitzenmacher; Marc Najork

2000-01-01

459

AEROSOL SAMPLING INLETS AND INHALABLE PARTICLES  

EPA Science Inventory

The problem of sampling aerosols from the ambient atmosphere has been considered from a theoretical point of view. Following a review of the various samplers and inlets used in ambient sampling, the factors contributing to high sampling efficiency for large particles are discusse...

460

An expert sample analysis planner  

SciTech Connect

Analytical chemists are faced with the problem of choosing an appropriate analytical technique for a particular sample and weighing the options as they affect precision, time, and cost. This paper describes a computer technique to assist managers in reviewing the alternatives and to match needs with the resources available. This paper proposes an expert system, knowledgeable of analytical chemistry techniques, to create sample plans. Sample planning is an appropriate topic for expert systems because scarce human expertise is required to complete sample plans. A sample plan is the description of how samples received at the Savannah River Laboratory are handled, controlled, measured, and dispositioned. Sample planning is difficult because multiple experts are needed, planning is not a static function, and planning is time consuming. An Expert Sample Analyses Planner (XSAP) is proposed to create sample plans for laboratory managers. XSAP supplements the scarce knowledge of analytical techniques creating sample plans based on analysis constraints, methods available, and time requirements. XSAP interacts with the chemist to suggest sample plans. XSAP considers equipment available locally, at other Savannah River laboratories, at other Department of Energy facilities, and at other commercial laboratories. XSAP allows options on scheduling: best solution, cheapest solution, best local solution, and fastest solution. 26 refs.

Spencer, W.A.; Parks, W.S.

1990-01-01

461

Antioxidant activity evaluation involving hemoglobin-related free radical reactivity.  

PubMed

Two methods for the measurement of antioxidant capacity are described: one based on a chronometric variation of a hemoglobin ascorbate peroxidase assay and the other based on electron paramagnetic resonance (EPR) spectra collected upon alkaline treatment of ethanolic samples. The involved chemical mechanisms are discussed, alongside the most important benefits and shortcomings; the assays offer new qualitative and quantitative information on samples of biological as well as synthetic origin. PMID:25323512

Mot, Augustin C; Bischin, Cristina; Damian, Grigore; Silaghi-Dumitrescu, Radu

2015-01-01

462

Predictors of Extradyadic Sexual Involvement in Unmarried Opposite-Sex Relationships  

PubMed Central

Using a sample of unmarried individuals in opposite-sex romantic relationships that was representative of the United States (N = 933), the current study prospectively evaluated predictors of extradyadic sexual involvement (ESI) over 20-months. Data were collected with self-report questionnaires via U.S. mail. Participants were 18–35 years old and were 34.9% male. Variables tested as predictors included involved-partner factors such as demographic characteristics, sexual history, and mental health, as well as relationship-related factors including communication, sexual dynamics, and aspects of commitment. Future ESI was significantly predicted by lower baseline relationship satisfaction, negative communication, aggression, lower dedication, absence of plans to marry, suspicion of partner’s ESI, and partner’s ESI. It was not predicted by sexual frequency, sexual dissatisfaction, or cohabitation status. Although more problems with alcohol use, more previous sex partners, and having parents who never married one another predicted future ESI, there were many involved-partner demographic factors that did not predict later ESI (e.g., gender, age, education, religiosity, having divorced parents, and having children). None of the results were moderated by gender. These results suggest that compared to demographic characteristics, relationship dynamics and negative interactions are more strongly predictive of future ESI. Implications for future research are discussed. PMID:22524318

Maddox Shaw, Amanda M.; Rhoades, Galena K.; Allen, Elizabeth S.; Stanley, Scott M.; Markman, Howard J.

2012-01-01

463

Youth Gambling Problems: Examining Risk and Protective Factors  

Microsoft Academic Search

This study examined the relationship between several pre-examined risk factors for youth problem gambling, a number of potential protective factors for youth problem gambling, and the development of adolescent problem gambling. The sample consisted of 2179 students, ages 11–19. The results of analyses of variance revealed that lower family and school connectedness are associated with adolescent problem gambling. Further, an

LAURIE DICKSON; JEFFREY L. DEREVENSKY; RINA GUPTA

2008-01-01

464

Application of the Method of Auxiliary Sources to the Wideband Electromagnetic Induction Problem  

E-print Network

Application of the Method of Auxiliary Sources to the Wideband Electromagnetic Induction Problem F of auxiliary sources (MAS) is formulated and applied to solution of wideband electromagnetic induction problems. INTRODUCTION The investigation of electromagnetic induction (EMI) problems involving highly conducting

Shubitidze, Fridon

465

Problem Solving and Community Activity Series: Understanding the Problem with Wooden Legs  

NSDL National Science Digital Library

This document for teachers provides four activities to develop students' ability to understand and interpret problems. These strategies help students deepen their focus and improve their problem-solving skills. The document includes both Problem Solving goals and Communication goals, as well as sample activities and specific examples related to the Wooden Legs Problem of the Week from the Math Forum. A copy of the complete problem, the scenario (with the question removed) and student handouts for applying the problem-solving strategies are also provided.

Ray, Max; Weimar, Stephen; Regis, Troy P.

2011-01-01

466

Depression and Related Problems in University Students  

ERIC Educational Resources Information Center

Method: Depression and related problems were studied in a sample of 283 university students. Results: The students with high depression scores also had high scores on anxiety, intrusive thoughts, controlling intrusive thoughts and sleep disturbances scales. A stepwise regression suggested that those problems contributed to a significant proportion…

Field, Tiffany; Diego, Miguel; Pelaez, Martha; Deeds, Osvelia; Delgado, Jeannette

2012-01-01

467

VISIM: Sequential simulation for linear inverse problems  

Microsoft Academic Search

Linear inverse Gaussian problems are traditionally solved using least squares-based inversion. The center of the posterior Gaussian probability distribution is often chosen as the solution to such problems, while the solution is in fact the posterior Gaussian probability distribution itself. We present an algorithm, based on direct sequential simulation, which can be used to efficiently draw samples of the posterior

Thomas Mejer Hansen; Klaus Mosegaard

2008-01-01

468

Working with Children with Handwriting Problems.  

ERIC Educational Resources Information Center

An empirical approach to remediating handwriting problems in children is presented. After an observation period, the teacher gathers a number of handwriting samples, and using information from both sources, analyzes the problem. A checklist is used to list aspects of the analysis, such as general handwriting characteristics and degree of proximity…

Cieslicki, Virginia L.

1980-01-01

469

Mining fuzzy association rules for classification problems  

Microsoft Academic Search

The effective development of data mining techniques for the discovery of knowledge from training samples for classification problems in industrial engineering is necessary in applications, such as group technology. This paper proposes a learning algorithm, which can be viewed as a knowledge acquisition tool, to effectively discover fuzzy association rules for classification problems. The consequence part of each rule is

Yi-Chung Hu; Ruey-Shun Chen; Gwo-Hshiung Tzeng

2002-01-01

470

A Bayesian Analysis of Some Nonparametric Problems  

Microsoft Academic Search

The Bayesian approach to statistical problems, though fruitful in many ways, has been rather unsuccessful in treating nonparametric problems. This is due primarily to the difficulty in finding workable prior distributions on the parameter space, which in nonparametric ploblems is taken to be a set of probability distributions on a given sample space. There are two desirable properties of a

Thomas S. Ferguson

1973-01-01

471

Orthopedic involvement in antiphospholipid syndrome.  

PubMed

Antiphospholipid syndrome (APS) is a common autoimmune disease, manifested by vascular thrombosis and fetal loss in the presence of antiphospholipid antibodies. Orthopedic involvement is a relatively novel and under-recognized feature of APS. In this article we review the association of primary, secondary, and catastrophic APS with diverse orthopedic conditions, including osteonecrosis in adult and pediatric patients, bone marrow necrosis, nontraumatic fractures, and some other disorders. PMID:17916988

Gorshtein, Alexander; Levy, Yair

2007-04-01

472

Discoid lupus erythematosus involving gingiva.  

PubMed

Desquamative gingival lesions are non-plaque induced inflammatory gingival lesions. It is a clinical description and not a diagnosis. These desquamative lesions represent oral manifestations of various dermatoses. Discoid lupus erythematosus is one of the rare dermatoses which show desquamative lesions as oral manifestations. This article presents a rare case report of discoid lupus erythematosus with oral lesions involving gingiva of a 66-year-old female patient. PMID:22628979

Kranti, K; Seshan, Hema; Juliet, J

2012-01-01

473

Discoid lupus erythematosus involving gingiva  

PubMed Central

Desquamative gingival lesions are non-plaque induced inflammatory gingival lesions. It is a clinical description and not a diagnosis. These desquamative lesions represent oral manifestations of various dermatoses. Discoid lupus erythematosus is one of the rare dermatoses which show desquamative lesions as oral manifestations. This article presents a rare case report of discoid lupus erythematosus with oral lesions involving gingiva of a 66-year-old female patient. PMID:22628979

Kranti, K.; Seshan, Hema; Juliet, J.

2012-01-01

474

Multiple behavioural impulsivity tasks predict prospective alcohol involvement in adolescents  

PubMed Central

Aims We investigated reciprocal prospective relationships between multiple behavioural impulsivity tasks (assessing delay discounting, risk-taking and disinhibition) and alcohol involvement (consumption, drunkenness and problems) among adolescents. We hypothesized that performance on the tasks would predict subsequent alcohol involvement, and that alcohol involvement would lead to increases in behavioural impulsivity over time. Design Cross-lagged prospective design in which impulsivity and alcohol involvement were assessed five times over 2 years (once every 6 months, on average). Setting Classrooms in secondary schools in North West England. Participants Two hundred and eighty-seven adolescents (51.2% male) who were aged 12 or 13 years at study enrolment. Measurements Participants reported their alcohol involvement and completed computerized tasks of disinhibition, delay discounting and risk-taking at each assessment. Cross-sectional and prospective relationships between the variables of interest were investigated using cross-lagged analyses. Findings All behavioural impulsivity tasks predicted a composite index of alcohol involvement 6 months later (all Ps?involvement did not predict performance on behavioural impulsivity tasks at any subsequent time point. Conclusions Several measures of impulsivity predict escalation in alcohol involvement in young adolescents, but alcohol use does not appear to alter impulsivity. PMID:23795646

Fernie, Gordon; Peeters, Margot; Gullo, Matthew J; Christiansen, Paul; Cole, Jon C; Sumnall, Harry; Field, Matt

2013-01-01

475

Food production -- problems and prospects.  

PubMed

Improvements are needed in balancing the problems associated with population growth and food production. A review of the problems of rapid population growth and declining food production and suggestions for resolution are given. World population has increased over the past 10 years by 760 million, which is equal to adding the combined population of Africa and South America. Future increases are expected to bring total population to 6.1 billion by the year 2000 and 8.2 billion in 2025 (exponential increases). Food production/capita has declined since 1971 in the world and in Nigeria, particularly in the recent past. The food production problem is technical, environmental, social, political, and economic. Various scientific and technological methods for increasing food production are identified: mechanization, irrigation, use of fertilizers, control of weeds and insects, new varieties of farm animals or high-yielding strains of grain, land reclamation, soil conservation, river basin development, adequate storage facilities, infrastructure development, and birth control. Economic and social approaches involve short-term and long-term strategies in social readjustment and institutional change. For instance, large scale farmers should become contract growers for certain firms. Bureaucratic red tape should be eliminated in institutions which provide agricultural services. Environmental problems need urgent attention. Some of these problems are soil erosion from mechanization, water salinization from irrigation, accumulation of DDT in food and water and animal life from pesticide use, and water pollution from chemical fertilizers. Food production can be increased with more ecologically sound practices. Information about weather and weather forecasting allows for more suitable land management. The influence of rainfall (the amount and distribution) in Nigeria is greater than any other climatic factor. Solar radiation is a significant feature in production of dry matter and yield. Shifting cultivation and land tenure systems should involve conservation farming techniques. organic manures and appropriate use of chemical fertilizers can raise soil fertility. Other problems are identified as the spread of bilharzia and the settlement of nomadic tribes. PMID:12317928

Anifowoshe, T O

1990-03-01

476

Quasi-Lagrangian Chemical Sampling during INTEX-B  

Microsoft Academic Search

Lagrangian sampling requires taking in situ measurements of an air parcel, followed by later sampling of that same parcel after it has moved to a new location. This sampling is virtually impossible to achieve for atmospheric parcels; however, a quasi-Lagrangian approach is more feasible. Quasi-Lagrangian sampling involves taking measurements of a parcel at one location, and later sampling of what

A. Latto; H. Fuelberg

2007-01-01

477

Developments in Sampling and Analysis Instrumentation for Stationary Sources  

ERIC Educational Resources Information Center

Instrumentation for the measurement of pollutant emissions is considered including sample-site selection, sample transport, sample treatment, sample analysis, and data reduction, display, and interpretation. Measurement approaches discussed involve sample extraction from within the stack and electro-optical methods. (BL)

Nader, John S.

1973-01-01

478

STACK SAMPLING FOR ORGANIC EMISSIONS  

EPA Science Inventory

The paper reviews some of the more important principles involved in stack sampling for organics, briefly describes and discusses recently developed equipment, and points out a few of the more serious pitfalls. Extensive references are provided, many of which are often overlooked ...

479

SAMPLING DESIGNS -RANDOM SAMPLING, ADAPTIVE AND SYSTEMATIC  

E-print Network

.2 STRATIFIED RANDOM SAMPLING................................................................ 341 8..................................................................361 8.3.2 Stratified Adaptive Cluster Sampling ................................................365 8 samples. Good sampling methods are critically #12;Chapter 8 Page 325 important in ecology because we want

Krebs, Charles J.

480

WORD PROBLEM MANIA  

NSDL National Science Digital Library

Practice all of your algebra skills by solving word problems Answer the word problems to play online basketball in Scoring Math Problems Then, try more algebra problems by figuring out the values of objects in the puzzle in Puzzling Algebra Values For more practice with word problems, try Grand Slam Baseball ...

Shields, Ms.

2007-10-27

481

Childhood abuse and neglect and transitions in stages of alcohol involvement among women: A latent transition analysis approach  

PubMed Central

Background Childhood abuse and neglect have been linked with alcohol disorders in adulthood yet less is known about the potential of early trauma to influence transitions in stages of alcohol involvement among women. Study aims were to (1) identify stages of women’s alcohol involvement, (2) examine the probability of transitions between stages, and (3) investigate the influence of four domains of childhood abuse and neglect (sexual abuse, physical abuse, neglect, and witness to domestic violence), assessed individually and as poly-victimization, on transitions. Methods The sample consisted of 11,750 adult female current drinkers identified in Wave 1 (2001–2002) and re-interviewed in Wave 2 (2004–2005) of the National Epidemiological Survey on Alcohol and Related Conditions. Results Three stages of alcohol involvement emerged from latent class analysis of 11 DSM-IV abuse/dependence criteria: severe (1.5% at Wave 1, 1.9% at Wave 2), hazardous (13.6% at Wave 1, 16.0% at Wave 2), and non-problem drinking (82.1% at Wave 1, 84.5% at Wave 2). Adjusted latent transition analyses determined transition probabilities between stages across waves. Women reporting any childhood abuse and neglect were more likely to advance from the non-problem drinking class at Wave 1 to severe (AOR = 3.90, 95% CI = 1.78–8.53) and hazardous (AOR = 1.56, 95% CI = 1.22–2.01) drinking classes at Wave 2 relative to women without this history. Associations were also observed between individual domains and transition from no problems to severe alcohol stage. Conclusions Results suggest a long-term impact of childhood abuse and neglect as drivers of progression in women’s alcohol involvement. PMID:23639389

La Flair, Lareina N.; Reboussin, Beth A.; Storr, Carla L.; Letourneau, Elizabeth; Green, Kerry M.; Mojtabai, Ramin; Pacek, Lauren R.; Alvanzo, Anika A.H.; Cullen, Bernadette; Crum, Rosa M.

2013-01-01

482

The nature and frequency of chimeras in eukaryotic metagenetic samples.  

PubMed

Pyrosequencing of an artificially assembled nematode community of known nematode species at known densities allowed us to characterize the potential extent of chimera problems in multi-template eukaryotic samples. Chimeras were confirmed to be very common, making up to 17% of all high quality pyrosequencing reads and exceeding 40% of all OCTUs (operationally clustered taxonomic units). Typically, chimeric OCTUs were made up of single or double reads, but very well covered OCTUs were also present. As expected, the majority of chimeras were formed between two DNA molecules of nematode origin, but a small proportion involved a nematode and a fragment of another eukaryote origin. In addition, examples of a combination of three or even four different template origins were observed. All chimeras were associated with the presence of conserved regions with 80% of all recombinants following a conserved region of about 25bp. While there was a positive influence of species abundance on the overall number of chimeras, the influence of specific-species identity was less apparent. We also suggest that the problem is not nematode exclusive, but instead applies to other eukaryotes typically accompanying nematodes (e.g. fungi, rotifers, tardigrades). An analysis of real environmental samples revealed the presence of chimeras for all eukaryotic taxa in patterns similar to that observed in artificial nematode communities. This information warrants caution for biodiversity studies utilizing a step of PCR amplification of complex DNA samples. When unrecognized, generated abundant chimeric sequences falsely overestimate eukaryotic biodiversity. PMID:23482827

Porazinska, Dorota L; Giblin-Davis, Robin M; Sung, Way; Thomas, W Kelley

2012-03-01

483

The Role of Perceived Parental Over-Involvement in Student Test Anxiety  

ERIC Educational Resources Information Center

The effects of perceived parental over-involvement on students' level of test anxiety were examined in two studies. In study 1, parental over-involvement scale was developed. The sample comprised 105 male and female undergraduate college students between the ages of 21 and 26. The scale contained two aspects of parental over-involvement: parental…

Shadach, Eran; Ganor-Miller, Orit

2013-01-01

484

Factors Associated with Involvement in Marriage Preparation Programs  

ERIC Educational Resources Information Center

Little is known empirically about the characteristics of couples who do and do not participate in marriage preparation. This study assessed the individual, couple, family, and sociocultural context variables that distinguish couples who become involved in marriage preparation from those who do not, using a sample of 7,331 couples. The results…

Duncan, Stephen F.; Holman, Thomas B.; Yang, Chongming

2007-01-01

485

Jordanian School Counselor Involvement in School-Family-Community Partnerships  

ERIC Educational Resources Information Center

The purpose of this study was to identify the level of partnership between the school counselor, families and the local community in Jordan, as well as highlighting the factors that affect this partnership. A "School Counselor Involvement in School-Family-Community Partnerships Scale" was developed and administered to a sample of 152 school…

Ghaith, Souad Mansour; Banat, Suhaila Mahmood; Hamad, Ghada Esmail; Albadareen, Ghaleb Salman

2012-01-01

486

Factors Affecting Teen Involvement in Pennsylvania 4-H Programming  

ERIC Educational Resources Information Center

The study reported here determined the factors that affect teen involvement in 4-H programming. The design of the study was descriptive and correlational in nature. Using a purposive sampling procedure, a survey questionnaire was distributed to all (N=214) 4-H members attending the 4-H State Leadership Conference. The major findings of the study…

Gill, Bart E.; Ewing, John C.; Bruce, Jacklyn A.

2010-01-01

487

Reciprocal Longitudinal Relations between Nonresident Father Involvement and Adolescent Delinquency  

ERIC Educational Resources Information Center

Using a representative sample of low-income, primarily minority adolescents (N=647, aged 10-14 years at Wave 1), this study examined bidirectional longitudinal relations between nonresident father involvement, defined as contact and responsibility for children's care and behavior, and adolescent engagement in delinquent activities. Autoregressive…

Coley, Rebekah Levine; Medeiros, Bethany L.

2007-01-01

488

Examples of Massachusetts District Efforts to Increase Family Involvement  

ERIC Educational Resources Information Center

This publication provides a sample of activities taking place in schools. It is intended to offer ideas and provide contact information, so that others working to expand and improve family and community involvement in schools can benefit from shared experience. School districts and schools have implemented additional practices and policies to…

Massachusetts Department of Education, 2005

2005-01-01

489

Job Involvement in a Career Transition from University to Employment  

ERIC Educational Resources Information Center

Job involvement-alienation was studied over three time points with a sample of undergraduate engineers undergoing a career transition from university to paid employment. Data from Newton and Keenan (1991) were re-analyzed under a latent growth curve modelling (LGCM) perspective, in order to provide an alternative analysis of the development of job…

Blanch, Angel; Aluja, Anton

2010-01-01

490

Patterns in Group Involvement Experiences during College: Identifying a Taxonomy  

ERIC Educational Resources Information Center

This study explored whether latent phenomena could be identified to classify students based on their patterns of involvement in cocurricular group experiences. The sample was comprised of 11,209 seniors from 50 institutions. A total of 4 latent factors were identified and students were classified into one of 8 latent classes. Findings offer new…

Dugan, John P.

2013-01-01

491

Ground Water Sampling at ISCO Sites - Residual Oxidant Impact on Sample Quality and Sample Preservation Guideline  

EPA Science Inventory

In-situ chemical oxidation (ISCO) involves the delivery of a chemical oxidant into the subsurface where oxidative reactions transform ground water contaminants into less toxic or harmless byproducts. Due to oxidant persistence, ground water samples collected at hazardous waste si...

492

Sampling Errors of Variance Components.  

ERIC Educational Resources Information Center

A study on sampling errors of variance components was conducted within the framework of generalizability theory by P. L. Smith (1978). The study used an intuitive approach for solving the problem of how to allocate the number of conditions to different facets in order to produce the most stable estimate of the universe score variance. Optimization…

Sanders, Piet F.

493

Parent Academic Involvement as Related to School Behavior, Achievement, and Aspirations: Demographic Variations Across Adolescence  

PubMed Central

A longitudinal model of parent academic involvement, behavioral problems, achievement, and aspirations was examined for 463 adolescents, followed from 7th (approximately 12 years old) through 11th (approximately 16 years old) grades. Parent academic involvement in 7th grade was negatively related to 8th-grade behavioral problems and positively related to 11th-grade aspirations. There were variations across parental education levels and ethnicity: Among the higher parental education group, parent academic involvement was related to fewer behavioral problems, which were related to achievement and then aspirations. For the lower parental education group, parent academic involvement was related to aspirations but not to behavior or achievement. Parent academic involvement was positively related to achievement for African Americans but not for European Americans. Parent academic involvement may be interpreted differently and serve different purposes across sociodemographic backgrounds. PMID:15369527

Hill, Nancy E.; Castellino, Domini R.; Lansford, Jennifer E.; Nowlin, Patrick; Dodge, Kenneth A.; Bates, John E.; Pettit, Gregory S.

2009-01-01

494

Online optimization problems  

E-print Network

In this thesis, we study online optimization problems in routing and allocation applications. Online problems are problems where information is revealed incrementally, and decisions must be made before all information is ...

Lu, Xin, Ph. D. Massachusetts Institute of Technology. Operations Research Center

2013-01-01

495

Creating Problem Solving Natives  

NSDL National Science Digital Library

In this blog post, the author discusses how valuable the problem-solving tool of drawing (or acting) out the problem is to help learners make sense of the problem. Within the post a story problem is presented and examples of work from students who were successful and who were not successful in solving the problem are shown. Also included is a link to an AIMS problem solving activity, "Schmoos ânâ Goos" (cataloged separately) that is best solved by drawing a picture.

Pauls, Michelle

2013-03-04

496

Unbiased sampling of network ensembles  

E-print Network

Sampling random graphs with given properties is a key step in the analysis of networks, as random ensembles represent basic null models required to identify patterns such as communities and motifs. A key requirement is that the sampling process is unbiased and efficient. The main approaches are microcanonical, i.e. they sample graphs that exactly match the enforced constraints. Unfortunately, when applied to strongly heterogeneous networks (including most real-world graphs), the majority of these approaches become biased and/or time-consuming. Moreover, the algorithms defined in the simplest cases (such as binary graphs with given degrees) are not easily generalizable to more complicated ensembles. Here we propose a solution to the problem via the introduction of a `maximize-and-sample' (`Max & Sam') method to correctly sample ensembles of networks where the constraints are `soft' i.e. they are realized as ensemble averages. Being based on exact maximum-entropy distributions, our approach is unbiased by c...

Squartini, Tiziano; Garlaschelli, Diego

2014-01-01

497

Parent involvement and science achievement: A latent growth curve analysis  

NASA Astrophysics Data System (ADS)

This study examined science achievement growth across elementary and middle school and parent school involvement using the Early Childhood Longitudinal Study - Kindergarten Class of 1998--1999 (ECLS-K). The ECLS-K is a nationally representative kindergarten cohort of students from public and private schools who attended full-day or half-day kindergarten class in 1998--1999. The present study's sample (N = 8,070) was based on students that had a sampling weight available from the public-use data file. Students were assessed in science achievement at third, fifth, and eighth grades and parents of the students were surveyed at the same time points. Analyses using latent growth curve modeling with time invariant and varying covariates in an SEM framework revealed a positive relationship between science achievement and parent involvement at eighth grade. Furthermore, there were gender and racial/ethnic differences in parents' school involvement as a predictor of science achievement. Findings indicated that students with lower initial science achievement scores had a faster rate of growth across time. The achievement gap between low and high achievers in earth, space and life sciences lessened from elementary to middle school. Parents' involvement with school usually tapers off after elementary school, but due to parent school involvement being a significant predictor of eighth grade science achievement, later school involvement may need to be supported and better implemented in secondary schooling.

Johnson, Ursula Yvette

498

Finite Time Analysis of Stratified Sampling for Monte Carlo  

E-print Network

Finite Time Analysis of Stratified Sampling for Monte Carlo Alexandra Carpentier INRIA Lille - Nord We consider the problem of stratified sampling for Monte-Carlo integration. We model this problem the final estimation error. This example is just one of many for which an efficient method of sampling

Boyer, Edmond

499

Hybrid PRM Sampling with a Cost-Sensitive Adaptive Strategy  

Microsoft Academic Search

A number of advanced sampling strategies have been proposed in recent years to address the narrow passage problem for probabilistic roadmap (PRM) planning. These sampling strategies all have unique strengths, but none of them solves the problem completely. In this paper, we present a general and systematic approach for adaptively combining multiple sampling strategies so that their individual strengths are

David Hsu; Gildardo Sánchez-ante; Zheng Sun

2005-01-01

500

Fire Classifications Fires involving the ordinary  

E-print Network

Fire Classifications Fires involving the ordinary combustible materials such as wood, cloth, paper, plastics, etc. Fires involving combustible or flammable liquids such as gasoline, kerosene, oils, grease, paints and chemicals. Fires involving energized electrical equipment such as appliances, including

Jia, Songtao