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Search Results: 1 - 10 of 20579 matches for " James McMath "
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Continued fractions and Parallel SQUFOF
S. McMath,F. Crabbe,D. Joyner
Mathematics , 2006,
Abstract: In this partly expository paper, we discuss three results. (1) That the two-sided continued fraction of the normalized square root (an important part of the SQUFOF algorithm) has several very attractive properties - periodicity, a symmetry point corresponding to a factorization of $N$, and so on. (2) The infrastructure distance formula. (3) A method for parallelization of SQUFOF that maintains its efficiency per procesor as the number of processors increases, and thus is predicted to be useful for very large numbers of processors. The first two are known (in one form or another), the third may be new (at least the implementation in C using MPI is new).
Planetary Collisions outside the Solar System: Time Domain Characterization of Extreme Debris Disks
Huan Y. A. Meng,Kate Y. L. Su,George H. Rieke,Wiphu Rujopakarn,Gordon Myers,Michael Cook,Emery Erdelyi,Chris Maloney,James McMath,Gerald Persha,Saran Poshyachinda,Daniel E. Reichart
Physics , 2015, DOI: 10.1088/0004-637X/805/1/77
Abstract: Luminous debris disks of warm dust in the terrestrial planet zones around solar-like stars are recently found to vary, indicative of ongoing large-scale collisions of rocky objects. We use Spitzer 3.6 and 4.5 {\mu}m time-series observations in 2012 and 2013 (extended to 2014 in one case) to monitor 5 more debris disks with unusually high fractional luminosities ("extreme debris disk"), including P1121 in the open cluster M47 (80 Myr), HD 15407A in the AB Dor moving group (80 Myr), HD 23514 in the Pleiades (120 Myr), HD 145263 in the Upper Sco Association (10 Myr), and the field star BD+20 307 (>1 Gyr). Together with the published results for ID8 in NGC 2547 (35 Myr), this makes the first systematic time-domain investigation of planetary impacts outside the solar system. Significant variations with timescales shorter than a year are detected in five out of the six extreme debris disks we have monitored. However, different systems show diverse sets of characteristics in the time domain, including long-term decay or growth, disk temperature variations, and possible periodicity.
Beijing’s Policies for Managing Han and Ethnic-Minority Chinese Communities Abroad
James To
Journal of Current Chinese Affairs , 2012,
Abstract: The overseas Chinese (OC) form a vast network of powerful interest groups and important political actors capable of shaping the future of China from abroad by transmitting values back to their ancestral homeland (Tu 1991). While the Chinese Communist Party (CCP) welcomes and actively seeks to foster relations with the OC in order to advance China’s national interests, some cohorts may be hostile to the regime. In accordance with their distinct demographic and ethnic pro-files, the CCP’s qiaowu (侨务, OC affairs) infrastructure serves to entice, co-opt, or isolate various OC groupings. This article summarises the policies for managing different subsets of OC over the past three dec-ades, and argues that through qiaowu, the CCP has successfully unified cooperative groups for China’s benefit, while preventing discordant ones from eroding its grip on power.
The Program Assessment and Improvement Cycle Today: A New and Simple Taxonomy of General Types and Levels of Program Evaluation  [PDF]
James Carifio
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326145
Abstract: There has been strong pressure from just about every quarter in the last twenty years for higher education institutions to evaluate and improve their programs. This pressure is being exerted by several different stake holder groups simultaneously, and also represents the growing cumulative impact of four somewhat contradictory but powerful evaluation and improvement movements, models and advocacy groups. Consequently, the program assessment, evaluation and improvement cycle today is much different and far more complex than it was fifty years ago, or even two decades ago, and it is actually a highly diversified and confusing landscape from both the practitioner’s and consumer’s view of such evaluative and improvement information relative to seemingly different and competing advocacies, standards, foci, findings and asserted claims. Therefore, the purpose of this article is to present and begin to elucidate a relatively simple general taxonomy that helps practitioners, consumers, and professionals to make better sense of competing evaluation and improvement models, methodologies and results today, which should help to improve communication and understanding and to have a broad, simple and useful framework or schema to help guide their more detailed learning.
An antibody present in everybody that attacks malaria infected erythrocytes  [PDF]
James Kennedy
Journal of Biomedical Science and Engineering (JBiSE) , 2013, DOI: 10.4236/jbise.2013.67A1001
Abstract: These malaria targeting antibodies are band 3 antibodies and they recognize a special configuration of a molecule called band 3 that is present on erythrocytes. The special band 3 configuration is present on the surface of senescent erythrocytes, malaria infected erythrocytes, the erythrocytes of certain hemoglobinnopathies such as sickle cell disease and on the erythrocytes of some metabolic disorders such as G6PD. Note that these hemoglobinopathies and metabolic disorders all aid in the survival of falciparum malaria to such an extent that their incidence is increased in falciparum endemic areas [1-3]. Though there are many adhesive molecules involved in the pathology of falciparum malaria and sickle cell anemia, the focus here is on the band 3 molecules.
The level of patients’ satisfaction and perception on quality of nursing services in the Renal unit, Kenyatta National Hospital Nairobi, Kenya  [PDF]
James Ndambuki
Open Journal of Nursing (OJN) , 2013, DOI: 10.4236/ojn.2013.32025
Abstract:

Introduction: Renal failure is on the increase and patients have to identify with renal services and centres where services for renal replacement therapies are rendered. This calls for health care workers to offer services that are perceived as quality and satisfying in order to meet the biophysical and psychological needs of the patients. Study design: This was a descriptive cross-sectional study undertaken at the Renal unit of Kenyatta National Hospital (KNH). Purpose: The study aimed at determining the level of satisfaction and perception of the quality of nursing services in the Renal unit. Methodology: The study population included all patients who were seeking dialysis services during one month period of data collection. The sample size was 151 following data collection. Data collection tools consisted of semi-structured questionnaires which were administered with the aid of research assistants as well as checklists which were self administered. Data analysis and results: Analysis of data was performed using the statistical package of social sciences (SPSS) version 16. Results of data analysis were presented in form of descriptive statistics which included mean, standard deviation and percentages. Regression analysis, t-test and ANOVA were conducted to determine demographic predictors of patient satisfaction with the nursing services. The results of the study revealed that patients in the Renal unit were generally satisfied with the nursing services. The aggregate mean score for all patients on Likert scale was 71.2 out of 105, with a standard deviation of 16.8. Level of satisfaction was 67.8%. The findings also showed that there was no association between demographic characteristics with the levels of satisfaction with the nursing services. Recommendation: The hospital should keep the patients’ level of satisfaction high and maintain it through the provision of more dialysis machines and hiring more nurses.

Obesity and the Demand for Canadian Physician Services  [PDF]
James McIntosh
Health (Health) , 2014, DOI: 10.4236/health.2014.619301
Abstract: The objective of this study is to determine the role that obesity plays in how often Canadians visit their family doctors or general practitioners. Doctor visits are analyzed using mixtures of ordered probability models applied to sample survey data from the 2010 Canadian Community Health Survey. This procedure is shown to be superior in terms of likelihood criteria to the more usual one involving count models of doctor visits. The main result is that obesity is one of the leading causes of doctor visits. Obesity has become more important in the demand for physician services than smoking for all Canadians. Other factors including diabetes, the individual’s level of education, position in the income distribution, and drinking behavior are also important. The application of latent class’s ordered probability models by age-group and gender leads to results which are different from what others have found. While obesity is shown to be a serious problem in Canada, it has not yet reached the stage which some researchers have described as critical.
Alcohol and Type 2 Diabetes: Results from Canadian Cross-Sectional Data  [PDF]
James McIntosh
Journal of Diabetes Mellitus (JDM) , 2014, DOI: 10.4236/jdm.2014.44044
Abstract: Cross-section data from Canadian Community Health Surveys are used to examine the relationship between moderate alcohol use and type 2 diabetes. Results from these data are compared with those which have been obtained from prospective longitudinal studies. The major result is that both types of data yield similar conclusions with respect to this relationship. The reason why this occurs is because Canadian drinking behavior is quite stable once a respondent has become an adult and remains relatively stable thereafter. The only difference between the two types of survey is the time at which information on drinking behavior is obtained. Since this does not matter if drinking behavior is stable over large age ranges results from the two types of survey will be similar. Neither type of data can be used to support the proposition that the relationship between drinking behavior and the risk of diabetes is causal. Some advantages that sample survey data have over longitudinal data are also noted.
Politics and the Twitter Revolution: A Brief Literature Review and Implications for Future Research  [PDF]
James Nguyen
Social Networking (SN) , 2018, DOI: 10.4236/sn.2018.74018
Abstract:
This study conducted a review of the literature on Twitter and politics. The review is summarized under three inter-related themes: 1) does social media help politicians to be elected? 2) who benefits from social media? and 3) political polarization on Twitter. Regarding the first theme, some studies find a strong support for the argument that politicians may create electoral benefits from adopting this new technology, while others fail to find such evidence. Evidence regarding the second query is also mixed. Many have believed that underdogs may benefit the most from social media uses, but several studies challenge this claim by showing that the already established and popular politicians may be those who gain most from their Twitter uses. Taken altogether, previous evidence regarding the first and second queries is mixed. However, previous studies still find strong evidence of increasingly polarizing public opinions on Twitter and of social media’s contribution to this trend.
A Nonparametric Formula Relating the Elasticity of a Factor Demand to the Elasticity of Substitution  [PDF]
James Feigenbaum
Theoretical Economics Letters (TEL) , 2019, DOI: 10.4236/tel.2019.91019
Abstract:

It is well known for a Cobb-Douglas production function that the elasticity of a factor demand is the inverse of the share of output going to the other factors. Since Cobb-Douglas has a unit elasticity of substitution, the demand elasticity trivially equals the ratio of the elasticity of substitution to the share of output going to the other factor. I show here that this result can be generalized to any constant returns to scale production function. As a result, if a factor is known to be a substitute for (complement of) other factors, the inverse of the share of output going to other factors will be a lower (upper) bound for the factor’s elasticity of demand.

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