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Search Results: 1 - 10 of 9479 matches for " Patricia Juskiw "
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Nitrogen Fertilizer Rate and Cultivar Interaction Effects on Nitrogen Recovery, Utilization Efficiency, and Agronomic Performance of Spring Barley
Yadeta Anbessa,Patricia Juskiw
ISRN Agronomy , 2012, DOI: 10.5402/2012/531647
Abstract:
Nitrogen Fertilizer Rate and Cultivar Interaction Effects on Nitrogen Recovery, Utilization Efficiency, and Agronomic Performance of Spring Barley
Yadeta Anbessa,Patricia Juskiw
ISRN Agronomy , 2012, DOI: 10.5402/2012/531647
Abstract: A study was carried out at Lacombe, Alberta, to develop baseline information on nitrogen recovery, utilization efficiency, and agronomic performance of spring barley. This information may enable us to understand where the inefficiencies of N nutrition may lay and determine strategies to improve nitrogen use efficiency (NUE). Three divergent cultivars, “Manley” (two-rowed, tall, late maturing), “Noble” (six-rowed, mid-height, intermediate maturing), and “Tukwa” (six-rowed, semidwarf, early maturing), were grown under low (0?kg?ha-1), moderate (50?kg?ha-1) and high (100?kg ha-1) rates of applied N fertilization. Both N recovery and utilization efficiency decreased with the increase in rate of applied N fertilizer, and NUE declined from 45?kg?kg-1N under the low N treatment to 33?kg kg-1N under the moderate treatment and 24?kg?kg-1N under the high N treatment. The test cultivars were comparable in N uptake, but Tukwa and Noble were more efficient in their utilization of the N taken up than Manley, particularly under high N. Subsequently, while grain yield of Tukwa and Noble had increased linearly with rate of N fertilizer, the grain yield of Manley showed a declining trend under high N. This implies that, where a high input condition is targeted, improvement in N utilization efficiency may need to be given due consideration. 1. Introduction The cost of N fertilizers, as tied to the cost of natural gas and other contributing factors such as inflation, has sharply increased over the years. For example, in the last two decades alone, the average price for urea, one of the most commonly used forms of N fertilizer, has increased in the United States by about 150%, from $212?Mg?1 in the spring of 1991 to $526?Mg?1 in the spring of 2011 [1]. This increase in cost of N fertilizers has certainly affected profit margins of primary producers particularly for low market value crops such as barley (Hordeum vulgare L.). In addition, there are increasing concerns about environmental pollution of excessive N from agricultural uses. Improvement in nitrogen use efficiency (NUE) may increase net returns to producers and, at the same time, reduce the amount of N lost to the environment and its negative consequences. Nitrogen use efficiency is defined as grain yield per unit of N available to the crop, and it is the product of two primary components: the efficiency of recovery of available N from soil (often called N uptake efficiency, UpE) and the amount of grain yield produced per unit of N taken up by the crop (often called N utilization efficiency, UtE) [2]. Further, UtE
Monitoring Recreational Waters: How to Integrate Environmental Determinants  [PDF]
Patricia Turgeon
Journal of Environmental Protection (JEP) , 2012, DOI: 10.4236/jep.2012.328095
Abstract: Recreational waters are associated with a higher risk of disease for people engaged in activities that bring them into contact with these waters. The primary cause of contamination of recreational waters is fecal microorganisms, which may originate from various sources and involve several modulating factors, making it a complex public health and en- vironmental issue. Monitoring recreational water quality should include two key components: Microbial water testing and monitoring environmental determinants associated with higher risks of contamination. Conducting both activities provides the foundation for a comprehensive assessment according to risk and the actual level of fecal pollution and thus could promote good management actions to ensure safe water quality. Nevertheless, monitoring of environmental determinants is rarely fully integrated in monitoring programs and is also harder to achieve, especially when water pol- lution is mainly associated with nonpoint sources. In order to achieve identification and monitoring of environmental determinants associated with fecal contamination of recreational waters, some specific steps should be followed and some questions must be answered. The objective of this review article is to present current knowledge on this topic and to suggest and discuss recommendations. Potential sources of contamination and factors able to modulate them should be identified and measured after the geographical area influencing fecal contamination of recreational water has been delineated. Statistical models have been developed to identify the relative importance of these environmental characteristics on fecal pollution of recreational waters but they do not allow for a full comprehension of the exact processes leading to this pollution, thus other methods should also be used to better understand these processes.
Availability and accessibility of diabetes clinics on Trinidad: An analysis using proximity tools in a GIS environment  [PDF]
Patricia Boda
Health (Health) , 2013, DOI: 10.4236/health.2013.511A2006
Abstract:

Non-communicable diseases (NCDs), account for a growing number of deaths worldwide. The English-speaking Caribbean has the highest per capita burden of NCDs in the region of the Americas [1]. This paper presents an overview of availability and accessibility based on clinic hours and physician fulltime equivalents (FTE) on the island of Trinidad devoted to diabetes and wound care. The project integrates a Geographic Information System (GIS) with epidemiologic and bio-statistical data to provide a necessary spatial analysis not otherwise possible. It examines the island’s ability to effectively deliver treatment to residents with diabetes by providing a geographic perspective to data published on the internet by the Trinidad-Tobago Ministry of Health and the Central Statistical Office. Results indicate a significant regional variability in both numbers of physicians and office hours devoted to diabetes treatment.

Survivors’ Perspectives of Organizational Downsizing on Knowledge Sharing in a Downsized Environment  [PDF]
Patricia Michelle Hall
Open Journal of Leadership (OJL) , 2012, DOI: 10.4236/ojl.2012.14004
Abstract: Organizational workforce reductions can negatively affect a company’s ability to preserve its knowledge base. The problem researched in this study was the perceived effect of downsizing on knowledge sharing among surviving employees. The purpose of this study was to determine the perceived effect of downsizing on knowledge sharing. Survivors’ knowledge sharing behavior was examined in relation to 1) survivor syndrome, 2) attitude towards knowledge sharing, and 3) perceived loss of knowledge power. A quantitative correlation research design was used to investigate the relationship between downsizing and knowledge sharing. A web-based survey was used to collect data. The convenience sample consisted of 37 management employees in the Texas region of a management consultant organization. Three sets of variables were examined: 1) survivor syndrome and actual knowledge sharing behavior, 2) survivors’ attitudes toward knowledge sharing and actual knowledge sharing behavior, and 3) perceived loss of knowledge power and actual knowledge sharing behavior. Findings from a Spearman rank order correlation revealed a statistically significant positive correlation between perceived loss of knowledge power and actual knowledge sharing behavior. Understanding survivors’ reactions can assist with planning for future reductions, and lead to the development of training programs to counter the challenges.
Medications in Mexico: The Growth and Distribution of Pharmacies in Ciudad Juárez, Chihuahua, Mexico from 1996-2011  [PDF]
Patricia J. Boda
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.46A2008
Abstract:

US pharmacies tend to be located at intersections of major cross streets throughout a city, while in the case of Mexican border cities pharmacies are clustered close to US-Mexico border crossings. Presumably this is due to the volume of US clients who frequent the pharmacies. Although the precise number of border crossings to purchase medications is unclear, it is thought to be significant. In the past, patient-based surveys were the primary source for information regarding US residents crossing the border into Mexico for prescription medications. The current study examines the distribution of pharmacies throughout Ciudad Juárez, Chihuahua, Mexico, recording the change in the number of pharmacies over a 15-year period and suggesting the scale of US residents who use Mexican pharmacies. Field research was conducted in 1996 and 2011. Maps showing the location of pharmacies for these two years indicate a clustering of pharmacies within one and one-half miles of the city’s two principal border-crossings between the United States and Mexico. Provider-based surveys revealed that the majority of patients who use pharmacies closest to the border were US residents.

The challenge of combatting non-communicable diseases in Trinidad: Access to hospital care  [PDF]
Patricia J. Boda
Health (Health) , 2013, DOI: 10.4236/health.2013.511A2003
Abstract: Chronic illnesses, or non-communicable diseases (NCDs), account for a growing number of deaths worldwide. The English-speaking Caribbean has the highest per capita burden of NCDs in the region of the Americas [1]. This paper presents an overview of hospital availability on the island of Trinidad in the West Indies and examines rates of NCDs as reported in hospital discharge summaries. The project integrates a Geographic Information System (GIS) with epidemiologic and bio-statistical data to provide essential spatial analysis not otherwise possible. It examines the island’s ability to effectively deliver treatment to residents with NCDs by providing a geographic perspective to public data published on the internet by the Trinidad-Tobago Ministry of Health and the Central Statistical Office. The study reveals a significant variability in several dimensions of access to health care.
Application of the Cross Wavelet Transform to Solar Activity and Major Earthquakes Occurred in Chile  [PDF]
Patricia Alejandra Larocca
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.711095
Abstract: Historical earthquakes registered in Chile (from 1900 up to 2015) with epicenters located between 17?30'S and 56?0'S latitude and yearly mean total sunspot number have been considered in order to evaluate a significant linkage between them. The occurrence of strong earthquakes along Chile and the sunspots activity are analyzed to inspect possible influence of solar cycles on earthquakes. The cross wavelet transform and wavelet coherence analysis were applied for sequences of sunspots and earthquakes activity. An 8 - 12 years modulation of earthquakes activity has been identified.
Adolescents’ Relationship between Physical Education and Longitudinal Physical Activity Trends  [PDF]
Alexandra Wiseman, Patricia Weir
Advances in Physical Education (APE) , 2017, DOI: 10.4236/ape.2017.73023
Abstract: With physical education (PE) being an avenue to be physically active and?learn about health and wellbeing, it is important to understand enrollment trends and physical activity (PA) behaviors among adolescents. The purpose of this study is to examine adolescents’ health profiles and gain an understanding of adolescents’ perspective of PE. The current study used mixed methodology to examine adolescents’ health profiles and gain understanding of their perspectives of PE. Part 1 identified relationships over a two-year period between: PE rating, physical activity (PA), and health variables using data from the National Longitudinal Survey of Children and Youth (NLSCY). Part 2 examined adolescents’ perspectives of PE through four focus groups.Overall, PE was preferred over other subjects by 78% of participants; and preferring PE predicted higher frequencies of PA, lower BMI, and higher self-esteem. Enrollment in high school PE was influenced by the environment, gender, course conflicts, and teacher influence.In summary, the majority of adolescents prefer PE;?it has an influence on health, and is an avenue for PA. Continued efforts need to be made to increase PE enrollment and participation to ensure the health of young people.
Consistency of Extended Nelson-Siegel Curve Families with the Ho-Lee and Hull and White Short Rate Models  [PDF]
Patricia Kisbye, Karem Meier
Journal of Mathematical Finance (JMF) , 2017, DOI: 10.4236/jmf.2017.74050
Abstract: Nelson and Siegel curves are widely used to fit the observed term structure of interest rates in a particular date. By the other hand, several interest rate models have been developed such their initial forward rate curve can be adjusted to any observed data, as the Ho-Lee and the Hull and White one factor models. In this work we study the evolution of the forward curve process for each of these models assuming that the initial curve is of Nelson-Siegel type. We conclude that the forward curve process produces curves belonging to a parametric family of curves that can be seen as extended Nelson and Siegel curves. We show that the forward rate curve evolution has a linear or an exponential growth, depending on the particular short rate interest model. We applied the results to Argentinian short and forward rates obtained from the Lebac’s bills yields using the Hull and White short rate model, showing a good estimation of the observed forward rate curve for near dates when the initial forward curve is adjusted with a Nelson and Siegel one.
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