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Search Results: 1 - 10 of 3550 matches for " Jessica Fanguy Cortez "
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Teacher Preparation and the Tenants of Accountability  [PDF]
Leslie Jones, Gregg Stall, Gary Rosenthal, Jessica Fanguy Cortez, Angelle Hebert, Ruth Ray Jackson, Thea Williams-Black
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.621233
Abstract: There is an obvious interrelationship between K-12 student performances and the preparation of teachers in Teacher Education Programs in Higher Education. As accountability increases in K-12 educational systems for students and teachers, accountability increases in Teacher Preparation Programs. There are different methods for evaluating the effectiveness of Teacher Preparation Programs; and recent evaluation methods have focused on the performances of the K-12 students through value-added models. There are proponent and opponents of using value-added models. However, there is much agreement on the need to make improvements to Teacher Preparation Programs. A Task Force was formed in 2012 called the Network for Transforming Educator Preparation (NTEP). The Task Force was formed by the Council of Chief State School Officers (CCSSO). Licensure, Program Approval, and Data Collection, Analysis and Reporting are among the key areas addressed by the Tasks Force:
http://www.ccsso.org/Resources/Programs/Network_for_Transforming_Educator_Preparation_(NTEP).html. These are the similar areas addressed through accreditation processes for Teacher Preparation Programs. In this article, the challenges of accountability with a focus on accreditation are addressed. A review of teacher accreditation and six elements for improving teacher preparation are also discussed.
Mutation of Serine 1333 in the ATR HEAT Repeats Creates a Hyperactive Kinase
Jessica W. Luzwick, Edward A. Nam, Runxiang Zhao, David Cortez
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0099397
Abstract: Subcellular localization, protein interactions, and post-translational modifications regulate the DNA damage response kinases ATR, ATM, and DNA-PK. During an analysis of putative ATR phosphorylation sites, we found that a single mutation at S1333 creates a hyperactive kinase. In vitro and in cells, mutation of S1333 to alanine (S1333A-ATR) causes elevated levels of kinase activity with and without the addition of the protein activator TOPBP1. S1333 mutations to glycine, arginine, or lysine also create a hyperactive kinase, while mutation to aspartic acid decreases ATR activity. S1333A-ATR maintains the G2 checkpoint and promotes completion of DNA replication after transient exposure to replication stress but the less active kinase, S1333D-ATR, has modest defects in both of these functions. While we find no evidence that S1333 is phosphorylated in cultured cells, our data indicate that small changes in the HEAT repeats can have large effects on kinase activity. These mutants may serve as useful tools for future studies of the ATR pathway.
Space Technology for Decarbonising City Precincts  [PDF]
Jessica Bunning
Journal of Geographic Information System (JGIS) , 2013, DOI: 10.4236/jgis.2013.55042
Abstract: Space technology is a powerful tool for climate research. Satellite data improve knowledge of the human impact on the Planet’s physical geography. Similarly, remote sensing technology enhances understanding of the human impact on rising global carbon emissions. However, so far satellites have been principally limited to measuring the carbon emissions of cities from space. Standing alone, satellite technology is incapable of advancing the goal of decarbonisation. This will be achieved only if cities create local methodologies that significantly enhance the carbon reduction process. There exists enormous potential to bridge remote sensing for earth observation and global environmental change with local action towards decarbonised urban renewal and redevelopment. Satellite remote sensing has the ability to demonstrate if local remedial strategies are succeeding, and assist with planning, developing, and monitoring low and zero carbon infrastructure systems. Satellite-derived data can facilitate informed discussion and decision-making between community stakeholders to deliver low carbon outcomes at the precinct scale. Satellite-based systems can be integrated within the urban fabric to assist climate change mitigation. This paper is based on current work implemented jointly with municipalities to ascertain where within city precincts carbon emissions originate and how they can ultimately be reduced. It presents space technology as an instrumental tool for understanding the carbon impact of citiesin terms of the carbon intensive patterns and processes that shape human society, as well as having great potential for providing end-user products to communities to enhance the process of decarbonising city precincts.
An Experimental Study of Microbial Fuel Cells for Electricity Generating: Performance Characterization and Capacity Improvement  [PDF]
Jessica Li
Journal of Sustainable Bioenergy Systems (JSBS) , 2013, DOI: 10.4236/jsbs.2013.33024
Abstract:

This paper studies the electricity generating capacity of microbial fuel cells (MFCs). Unlike most of MFC research, which targets the long term goals of renewable energy production and wastewater treatment, this paper considers a niche application that may be used immediately in practice, namely powering sensors from soils or sediments. There are two major goals in this study. The first goal is to examine the performance characteristics of MFCs in this application. Specifically we investigate the relationship between the percentage of organic matter in a sample and the electrical capacity of MFCs fueled by that sample. We observe that higher percentage of organic matter in a sample results in higher electricity production of MFCs powered by that sample. We measure the thermal limits that dictate the temperature range in which MFCs can function, and confirm that the upper thermal limit is 40℃. The new observation is that the lower thermal limit is -5℃, which is lower than 0℃ reported in the literature. This difference is important for powering environmental sensors. We observe that the electricity production of MFCs decreases almost linearly over a period of 10 days. The second goal is to determine the conditions under which MFCs work most efficiently to generate electricity. We compare the capacity under a variety of conditions of sample types (benthic mud, top soil, and marsh samples), temperatures (0℃, 40℃, and room temperature), and sample sizes (measuring 3.5 cm × 3.5 cm × 4.6 cm, 10.2 cm × 10.2 cm × 13.4 cm, and 2.7 cm × 2.7 cm × 3.8 cm), and find that the electricity capacity is greatest at 0℃, powered by benthic mud sample with the largest chamber size. What seems surprising is that 0℃ outperforms both room temperature and benthic mud sample outperforms marsh sample, which appears to be richer in organic matter. In addition, we notice that although the largest chamber size produces the greatest capacity, it suffers

Control Schemes to Reduce Risk of Extinction in the Lotka-Volterra Predator-Prey Model  [PDF]
Jessica Li
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.27071
Abstract:

The Lotka-Volterra predator-prey model is widely used in many disciplines such as ecology and economics. The model consists of a pair of first-order nonlinear differential equations. In this paper, we first analyze the dynamics, equilibria and steady state oscillation contours of the differential equations and study in particular a well-known problem of a high risk that the prey and/or predator may end up with extinction. We then introduce exogenous control to reduce the risk of extinction. We propose two control schemes. The first scheme, referred as convergence guaranteed scheme, achieves very fine granular control of the prey and predator populations, in terms of the final state and convergence dynamics, at the cost of sophisticated implementation. The second scheme, referred as on-off scheme, is very easy to implement and drive the populations to steady state oscillation that is far from the risk of extinction. Finally we investigate the robustness of these two schemes against parameter mismatch and observe that the on-off scheme is much more robust. Hence, we conclude that while the convergence guaranteed scheme achieves theoretically optimal performance, the on-off scheme is more attractive for practical applications.

El Acceso a los Servicios de Atenci 3n de la Salud en el Per o y la Equidad en su Financiamiento El Acceso a los Servicios de Atenci 3n de la Salud en el Per o y la Equidad en su Financiamiento
Rafael Cortez
Revista de Análisis Económico (RAE) , 1996,
Abstract: This study develops a methodology to analize the demand for health services. It is based on dichotomic regressions aimed at determining why consumers prefer certain services and do not demand other. It discusses the possible impact on the number of medical vis its of changes in health costs and households income, and focuses on highlighting some criteria regarding the efficiency and fairness of current policies of coverage and finance. The empirical analysis uses information from the National Survey on Health Expenditures (Endesa, 1995), which obtained data on health and demographic variables from a sample of 1,290 households and 6,366 individuals. This study develops a methodology to analize the demand for health services. It is based on dichotomic regressions aimed at determining why consumers prefer certain services and do not demand other. It discusses the possible impact on the number of medical vis its of changes in health costs and households income, and focuses on highlighting some criteria regarding the efficiency and fairness of current policies of coverage and finance. The empirical analysis uses information from the National Survey on Health Expenditures (Endesa, 1995), which obtained data on health and demographic variables from a sample of 1,290 households and 6,366 individuals.
Singularites generiques et quasi-resolutions des varietes de Schubert pour le groupe lineaire
Aurelie Cortez
Mathematics , 2001,
Abstract: We determine explicitly the irreducible components of the singular locus of any Schubert variety for GL_n(K), K being an algebraically closed field of arbitrary characteristic. We also describe the generic singularities along these components. The case of covexillary Schubert varieties was solved in an earlier work of the author [Ann. Inst. Fourier vol. 51 fasc. 2 (2001), 375-393]. Here, we first exhibit some irreducible components of the singular locus of X_w, by describing the generic singularity along each of them. Let S_w be the union of these components. As mentioned above, the equality S_w = Sing X_w is known for covexillary varieties, and we base our proof of the general case on this result. More precisely, we study the exceptional locus of certain quasi-resolutions of a non-covexillary Schubert variety X_w, and we relate the intersection of these loci to S_w. Then, by induction on the dimension, we can establish the equality.
Slowly Oscillating Solution of the Cubic Heat Equation
Fernando Cortez
Mathematics , 2015,
Abstract: In this paper, we are considering the Cauchy problem of the nonlinear heat equation $u\_t -\Delta u= u^{3 },\ u(0,x)=u\_0$. After extending Y. Meyer's result establishing the existence of global solutions, under a smallness condition of the initial data in the homogeneous Besov spaces $\dot{B}\_{p}^{-\sigma, \infty}(\mathbb{R}^{3})$, where $3 \textless{} p \textless{} 9$ and $\sigma=1-3/p$, we prove that initial data $u\_0\in \mathcal{S}(\mathbb{R}^{3})$, arbitrarily small in ${\dot B^{-2/3,\infty}\_{9}}(\mathbb{R}^{3})$, can produce solutions that explode in finite time. In addition, the blowup may occur after an arbitrarily short time.
Predicting Use of Lights and Siren for Patient Illnesses  [PDF]
Jessica Mueller, Laura Stanley
Open Journal of Safety Science and Technology (OJSST) , 2013, DOI: 10.4236/ojsst.2013.33008
Abstract:

Lights and siren are frequently used by Emergency Medical Service (EMS) groups to reduce response times and increase a patient’s chance for survival. However, the use of lights and siren in EMS patient transport has been associated with occasional inappropriate use, higher crash rates involving the ambulance, and a potential “wake effect” increasing crash rates in ambient traffic. This study examines types of patient illnesses and their involvement with either emergency (lights and siren engaged) or non-emergency transport. Patient care records were analyzed from a five-year period from a private medical transportation company. A binary logistic regression model was built to predict the transportation mode (lights and siren or non-emergency-mode) most likely to accompany each unique primary patient illness. Patient illnesses were identified that showed a higher probability of transport using lights and siren. Fifteen illness descriptions were identified from the records as being more likely to result in emergency mode travel, including airway obstruction, altered level of consciousness, breathing problems, cardiac arrest, cardiac symptoms, chest pain, congestive heart failure/pulmonary embolism, heart/cardiac, obstetrics, respiratory arrest, respiratory distress, stroke/cerebrovascular accident, trauma, unconscious, and patients where data was not entered. The patient illnesses associated with lights and siren were not limited to cardiac conditions and symptoms, which suggest that response-time goals based solely on cardiac arrest patients may need to be expanded to include other illnesses such as respiratory conditions. Expanded studies could assess whether or not lights and sirens result in a clinically significant time savings across the spectrum of illnesses that are currently being transported using lights and siren. The list of illnesses identified here as more commonly utilizing lights and siren could be useful to untrained EMS or dispatch workers to assist in minimizing unnecessary emergency mode travel, thereby increasing safety for EMS workers, patients, and the general public.

Building up Systematic Client-Centred Data as a Base for Clinical Outcome within Outpatient Neurorehabilitation  [PDF]
Jessica Vollertsen, Kersti Samuelsson
Open Journal of Therapy and Rehabilitation (OJTR) , 2016, DOI: 10.4236/ojtr.2016.41002
Abstract: Objective: This study describes the development and use of a specific database supporting personnel within outpatient neurological rehabilitation to reflect on existing interventions and improve future rehabilitation. Methods: Five outpatient rehabilitation centres in one county council in Sweden were involved in developing and implementing a systematic data collection template within the existing digital medical record system. Data were collected to get more information on the effects of outpatient stroke rehabilitation in patients who received rehabilitation the first year after a stroke (ICD-I64) and patients who received further rehabilitation 1 year or more after a stroke (ICD-I69). Data analysis included evaluation of balance, movement, activity/participation, health-related quality of life, and self-rated health. Results: The ICD-I64 group had positive results after treatment (p < 0.05) for all variables and the ICD-I69 group had positive results for balance and activity/participation. Conclusions: The use of systematic data collection provided a platform for employees and managers to discuss and use clinical results to improve the type and quality of rehabilitation interventions.
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