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Search Results: 1 - 10 of 27340 matches for " Todd Lee "
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Potentiometric Measurement of State-of-Charge of Lead-Acid Batteries Using Polymeric Ferrocene and Quinones Derivatives  [PDF]
Touma B. Issa, Pritam Singh, Murray V. Baker, Todd Lee
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2014, DOI: 10.4236/jasmi.2014.44015

Measurement of state-of-charge of lead-acid batteries using potentiometric sensors would be convenient; however, most of the electrochemical couples are either soluble or are unstable in the battery electrolyte. This paper describes the results of an investigation of poly (divinylferrocene) (PDVF) and Poly(diethynylanthraquinone) (PAQ) couples in sulfuric acid with the view to developing a potentiometric sensor for lead-acid batteries. These compounds were both found to be quite stable and undergo reversible reduction/oxidation in sulfuric acid media. Their redox potential difference varied linearly with sulfuric acid concentration in the range of 1 M - 5 M (i.e. simulated lead-acid electrolyte during battery charge/discharge cycles). A sensor based on these compounds has been investigated.


Enhancing Prospecitve Teachers' Coordination of Center and Spread: A Window Into Teacher Education Material Development
Hollylynne S. Lee,J. Todd Lee
Mathematics Educator , 2011,
Abstract: This paper describes a development and evaluation process used to create teacher education materials that help prepare middle and secondary mathematics teachers to teach data analysis and probability concepts with technology tools. One aspect of statistical reasoning needed for teaching is the ability to coordinate understandings of center and spread. The materials attempt to foster such coordination by emphasizing reasoning about intervals of data rather than a single focus on a point estimate (e.g., measure of center). We take a close look at several different data sources across multiple implementation semesters to examine prospective mathematics teachers’ ability to reason with center and spread in a coordinated way. We also look at the prospective teachers’ ability to apply their understandings in pedagogical tasks. Our analysis illustrates the difficulty in both achieving this understanding and transferring it to teaching practices. We provide examples of how results were used to revise the materials and address issues of implementation by mathematics teacher educators.
Does Religious Involvement Generate or Inhibit Fear of Crime?
Todd Matthews,Lee Michael Johnson,Catherine Jenks
Religions , 2011, DOI: 10.3390/rel2040485
Abstract: In victimology, fear of crime is understood as an emotional response to the perceived threat of crime. Fear of crime has been found to be affected by several variables besides local crime rates and personal experiences with victimization. This study examines the relationship between religion and fear of crime, an underexplored topic in the criminological literature. This gap is rather surprising given the central role religion has been found to play in shaping the attitudes and perceptions of congregants. In particular, religion has been found to foster generalized trust, which should engender lower levels of distrust or misanthropy, including that which is directed towards a general fear of crime. OLS regression was performed using data from the West Georgia Area Survey (n = 380). Controlling for demographic, community involvement, and political ideology variables, frequency of religious attendance was significantly and negatively associated with fear of property crime. This relationship remained even after a perceived neighborhood safety variable was introduced to the model. However, religious attendance was not significantly related to fear of violent crime, and religious orientation was unrelated to fear of property and violent crime. These results suggest that religious involvement conditionally reduces fear of crime, and the authors recommend that future research explore relationships between religion and fear of crime.
Cognitive behavioral therapy group intervention for HIV transmission risk behavior in perinatally infected adolescents  [PDF]
Ruth M. Senyonyi, Lee A. Underwood, Elisabeth Suarez, Seggane Musisi, Todd L. Grande
Health (Health) , 2012, DOI: 10.4236/health.2012.412195
Abstract: Purpose: This study analyzed treatment effects of cognitive behavioral therapy (CBT) group counseling intervention on HIV transmission risk behavior, depression, anxiety, and alcohol use in HIV perinatally infected adolescents attending an HIV clinical care center in Uganda, Africa. Method: A total of 186 adolescents were randomly assigned to an experimental or control arm and assigned into groups of 11 - 16 adolescents. The experimental groups received an 80-minute CBT based weekly intervention for 8 consecutive weeks, while the control groups received only standard group care. Data from self report assessments were analyzed at pre- and post-test using repeated measures of analysis of variance. The participants, analyzed by variable, included 115 for sexual behavior, 106 for depression, 88 for anxiety, and 115 for alcohol use. Results: The results from the study show a large significant difference (p = 0.006) between the experimental and control groups on the anxiety variable. There were no significant differences between the experimental and control groups on the variables of sexual behavior (p = 0.876), depression (p = 0.700), and alcohol use (p = 0.815). There was an indication of reduced levels of HIV sexual transmission risk behavior, depression, and alcohol use levels in the participants in both the experimental and control groups. Conclusions: Risky sexual behavior places HIV perinatally infected adolescents at risk of re-infection, sexually transmitted diseases, and transmitting HIV to their sexual partners. CBT group counseling intervention equipped the participating adolescents with appropriate life skills to deal with psychological distress and anxiety often seen in their lives and may be useful in routine medical care to reduce transmission risks and improve wellness and call for its incorporation into HIV preventive programs and counselor education.
Integrating Biodegradable 3-Dimensional-Printing into Tracheal Reconstruction  [PDF]
Todd A. Goldstein, Lee P. Smith, Benjamin D. Smith, Daniel A. Grande, David Zeltsman
Open Journal of Regenerative Medicine (OJRM) , 2015, DOI: 10.4236/ojrm.2015.43004
Abstract: Background: Currently, there is no set standard treatment for long-segment tracheomalacia and stenosis. In this study we set out to explore the potential to create a tissue engineered, biodegradable and three-dimensionally (3D) printed tracheal ring as a first step towards bioengineering a long segment tracheal replacement. Method of Approach: A 3D-Computer aided design (CAD) model was produced with multiple channels to allow for cellular growth while mimicking the native anatomy. The design was optimized to allow for printability, cellular expansion, and integration and 3D printed using a modified commercial 3D printer. Results: The cells grown in the scaffold demonstrated a similar proliferation trend compared to control. Chondrocytes within the 3D printed ring retained their phenotypic properties and did not infer any significant change in flexibility, contour and strength to the scaffold. Conclusion: The combination of living cells and a 3D modeled patient specific graft may address some of the unmet clinical needs in the field of tracheal reconstruction. This proof of concept study represents a first step towards producing a 3D printed and tissue engineered long segment tracheal replacement graft for airway surgery.
Erasing Sensorimotor Memories via PKMζ Inhibition
Lee Michael von Kraus,Todd Charlton Sacktor,Joseph Thachil Francis
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011125
Abstract: Sensorimotor cortex has a role in procedural learning. Previous studies suggested that this learning is subserved by long-term potentiation (LTP), which is in turn maintained by the persistently active kinase, protein kinase Mzeta (PKMζ). Whereas the role of PKMζ in animal models of declarative knowledge is established, its effect on procedural knowledge is not well understood. Here we show that PKMζ inhibition, via injection of zeta inhibitory peptide (ZIP) into the rat sensorimotor cortex, disrupts sensorimotor memories for a skilled reaching task even after several weeks of training. The rate of relearning the task after the memory disruption by ZIP was indistinguishable from the rate of initial learning, suggesting no significant savings after the memory loss. These results indicate a shared molecular mechanism of storage for declarative and procedural forms of memory.
Comparison of health-related quality of life measures in chronic obstructive pulmonary disease
A Simon Pickard, Yoojung Yang, Todd A Lee
Health and Quality of Life Outcomes , 2011, DOI: 10.1186/1477-7525-9-26
Abstract: We analyzed data collected from 120 COPD patients in a Veterans Affairs hospital. Patients self-completed two generic HRQL measures (EQ-5D and SF-36) and the disease-specific SGRQ. The ability of the summary scores of these HRQL measures to discriminate COPD disease severity based on Global Obstructive Lung Disease (GOLD) stage was assessed using relative efficiency ratios (REs). Strength of correlation was used to further evaluate associations between clinical and HRQL measures.Mean total scores for PCS-36, EQ-VAS and SGRQ were significantly lower for the more severe stages of COPD (p < 0.05). Using SGRQ total score as reference, the summary scores of the generic measures (PCS-36, MCS-36, EQ index, and EQ-VAS) all had REs of <1. SGRQ exhibited a stronger correlation with clinical measures than the generic summary scores. For instance, SGRQ was moderately correlated with FEV1 (r = 0.43), while generic summary scores had trivial levels of correlation with FEV1 (r < 0.2).The SGRQ demonstrated greater ability to discriminate among different levels of severity stages of COPD than generic measures of health, suggestive that SGRQ may provide COPD studies with greater statistical power than EQ-5D and SF-36 summary scores to capture meaningful differences in clinical severity.Chronic obstructive pulmonary disease (COPD) is a leading cause of death worldwide and is associated with a high burden of illness [1], particularly in terms of health-related quality of life (HRQL). COPD is characterized by airflow obstruction that is not fully reversible and symptoms such as dyspnea, sputum production, and chronic cough [2]. Airflow limitation is usually progressive; thus daily activities can become very difficult as the condition gradually worsens. Consequently, the burden of COPD on HRQL disease tends to increase with COPD severity [3-6].HRQL is inherently subjective, involving patient self-assessment of multiple dimensions of health that often are not strongly correlated with clin
Treatment and Outcome of Congenital Adrenal Hyperplasia: 21-Hydroxylase Deficiency
Peter A Lee, John S Fuqua, Todd D Nebesio
International Journal of Pediatric Endocrinology , 2011, DOI: 10.1155/2010/276843
Abstract: We begin with a summary of the recent Endocrine Society Clinical Practice Guideline, which provides an overview of the diagnosis and treatment of CAH across the lifespan. We then move on to discussions concerning the diagnosis and treatment of nonclassic CAH and the management of the various forms of CAH in the adult patient. Although hydrocortisone has been the treatment of choice for many years in children with CAH, more potent glucocorticoids such as dexamethasone are considered by some to be superior. A series of articles addresses the choice of glucocorticoid and the timing of administration. The section on treatment finishes with discussions of mineralocorticoid replacement and newer therapeutic modalities.The next section deals with psychological management, specifically with regards to psychosocial stress in families of affected patients. We then move on to models of care provision, including establishment of a medical home, multidisciplinary care, and a discussion of the roles of support and advocacy groups in the care of individuals with CAH.Assessments of treatment outcomes are critical for efforts to improve care. This issue finishes with a series of papers reviewing CAH outcomes, including growth in children, gynecologic and reproductive issues in women, bone health, and psychological, cognitive, and gender identity outcomes.The guest editors hope that this issue will, in a small way, advance their understanding of CAH and stimulate additional research and multidisciplinary teamwork, with the goal of improving the lives of those affected with this potentially devastating condition.Peter A. Lee, John S. Fuqua, Todd D. Nebesio
A shear spectral sum rule in a non-conformal gravity dual
Todd Springer,Charles Gale,Sangyong Jeon,Su Houng Lee
Physics , 2010, DOI: 10.1103/PhysRevD.82.106005
Abstract: A sum rule which relates a stress-energy tensor correlator to thermodynamic functions is examined within the context of a simple non-conformal gravity dual. Such a sum rule was previously derived using AdS/CFT for conformal $\mathcal{N} = 4$ Supersymmetric Yang-Mills theory, but we show that it does not generalize to the non-conformal theory under consideration. We provide a generalized sum rule and numerically verify its validity. A useful byproduct of the calculation is the computation of the spectral density in a strongly coupled non-conformal theory. Qualitative features of the spectral densities and implications for lattice measurements of transport coefficients are discussed.
Correlates of Persistent Smoking in Bars Subject to Smokefree Workplace Policy
Roland S. Moore,Juliet P. Lee,Scott E. Martin,Michael Todd,Bong Chul Chu
International Journal of Environmental Research and Public Health , 2009, DOI: 10.3390/ijerph6041341
Abstract: This study’s goal was to characterize physical and social environments of stand-alone bars associated with indoor smoking despite California’s smokefree workplace law. In a random sample of 121 stand-alone bars in San Francisco, trained observers collected data on patrons, staff, neighborhood, indoor settings and smoking behaviors. Using bivariate (chi-square) and hierarchical linear modeling analyses, we identified four correlates of patrons’ indoor smoking: 1) bars serving predominantly Asian or Irish patrons, 2) ashtrays, 3) bartender smoking, and 4) female bartenders. Public health officials charged with enforcement of smokefree bar policies may need to attend to social practices within bars, and heighten perceptions of consistent enforcement of smokefree workplace laws.
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