Frequency Estimation Of Single-Tone Sinusoids Under Additive And Phase Noise

We investigate the performance of main frequency estimation methods for a single-component complex sinusoid under complex additive white Gaussian noise (AWGN) as well as phase noise (PN). Two methods are under test: Maximum Likelihood (ML) method using Fast Fourier Transform (FFT), and the autocorrelation method (Corr). Simulation results showed that FFT-method has superior performance as compared to the Corr-method in the presence of additive white Gaussian noise (affecting the amplitude) and phase noise, with almost 20dB difference

Spindle Cell Carcinoma of the Tongue: A Rare Tumor in an Unusual Location

Spindle cell carcinoma is a rare biphasic tumor consisting of epithelial and mesenchymal components. Presence of this tumor type in the tongue has rarely been reported. Herein, a case of 55-year-old woman who presented with a polypoid lesion at her tongue has been reported. Surgery was performed and pathologic examination revealed a spindle cell carcinoma. We present this rare tumor with an unusual location to contribute in part to the better understanding and awareness of this rare malignancy

Tank tests to determine the effect of varying design parameters of planing-tail hulls II : effect of varying depth of step, angle of after- body keel, length of afterbody chine, and gross load

The second part of a series of tests made in Langley tank no. 2 to determine the effect of varying design parameters of planing-tail hulls is presented. Results are given to show the effects on resistance characteristics of varying angle of afterbody keel, depth of step, and length of afterbody chine. The effect of varying the gross load is shown for one configuration. The resistance characteristics of planing-tail hulls are compared with those of a conventional flying-boat hull. The forces on the forebody and afterbody of one configuration are compared with the forces on a conventional hull. Increasing the angle of afterbody keel had small effect on hump resistance and no effect on high-speed resistance but increased free-to-trim resistance at intermediate speeds. Increasing the depth of step increased hump resistance, had little effect on high-speed resistance, and increased free-to-trim resistance at intermediate speeds. Omitting the chines on the forward 25 percent of the afterbody had no appreciable effect on resistance. Omitting 70 percent of the chine length had almost no effect on maximum resistance but broadened the hump and increased spray around the afterbody. Load-resistance ratio at the hump decreased more rapidly with increasing load coefficient for the planing-tail hull than for the representative conventional hull, although the load-resistance ratio at the hump was greater for the planing-tail hull than for the conventional hull throughout the range of loads tested. At speeds higher than hump speed, load-resistance ratio for the planing-tail hull was a maximum at a particular gross load and was slightly less at heavier and lighter gross loads. The planing-tail hull was found to have lower resistance than the conventional hull at both the hump and at high speeds, but at intermediate speeds there was little difference. The lower hump resistance of the planing-tail hull was attributed to the ability of the afterbody to carry a greater percentage of the total load while maintaining a higher value of load-resistance ratio

Impact of HPV in Oropharyngeal Cancer

The incidence of oropharyngeal cancers has increased in the western world and Human Papilloma Virus (HPV) has been recognised as a risk factor in the last decades. During the same period the prevalence of HPV in oropharyngeal tumours has increased and HPV has been suggested responsible for the increase. The HPV-positive tumours are today recognized as a distinct subset of head and neck cancers with its own clinopathological and risk profile and have a significantly improved prognosis regardless of treatment strategy. This review summarizes current knowledge regarding human papillomavirus biology, oncogenic mechanisms, risk factors, and impact of treatment

A simple formula for forecasting the Botswana urban population total

The aim of the present paper is to establish a simple functional relationship linking urbanisation and economic growth. The paper consequently focuses on the interplay between developments in urban population and basic economic variables, with the latter seen as representative of important forces driving the urbanisation process. The purpose for establishing such a relationship is to produce a short and simple "annexe" to the revised MEMBOT model (forthcoming), capable of providing quantitative estimates illustrating the likely nature of urban population changes under alternative economic scenarios

Constructivist model for career internships: Integrating contextual learning and critical thinking

This project grew from a desire to help students draw meaningful connections between education and future career aspirations

Las Vegas Daily Optic, 05-06-1897

https://digitalrepository.unm.edu/lvdo_news/1187/thumbnail.jp

Las Vegas Daily Optic, 08-31-1897

https://digitalrepository.unm.edu/lvdo_news/1271/thumbnail.jp

Evaluation of a quantitative aerial thermography method for the determination of roof top heat loss

A quantitative aerial infrared thermographic method for the determination of residential roof top heat loss is studied utilizing data gathered on over 1000 homes in the city of Plattsburgh, New York. The aerial infrared thermographic technique used as the basis of this study accounts for atmospheric and emissivity effects on the thermogram data as well as convective and radiational losses from the roof surface. The strength of the method is tested on the basis of a multivariate first order linear regression analysis using the aerial heat flow measurements as the dependent variable and parameters derived from ground survey data as the independent variables. This analyses shows that using relatively simple models, a large portion of the variance in the dependent variable can be explained using the ground survey data. Results indicated that a value of R2 = 0.83 for the regression model can be obtained at a standard error in the dependent variable of less than 7 w/m2 over a range of heat flow values from 22 to 82 w/m2. The models constructed use insulation level, inside temperature, attic ventilation, and roof condition as parameters in the predictive equation. The modelling process was structured such that parameter inclusion was based on minimizing the standard error in the predictive equation. The quantitative thermography method was found to make significant errors in heat loss classification (based on a five class heat loss rating system) only one percent of the time based on an analysis of 90 residential structures. To contrast the results of the state of the art method with more commonly used technology, a classical (qualitative) interpretation method indicate that the classical approach has a tendency to deliver misleading results. The classical method was found to be in agreement with the more sophisticated method only 36% of the time. Indeed, the image interpretation approach traditionally employed placed 21% of the nearly 1000 homes studied two or more classes away from the class defined by the quantitative techniques, indicating the superiority of the advanced technology

An economic analysis of alternative dairy herd replacement policies on Grade A dairy farms in the Knoxville milkshed

The objectives of this study are: (1) to determine and describe present methods used by Grade A dairy farmers in the Knoxville milkshed in procuring dairy herd replacements; (2) to determine attitudes and factors affecting the dairy farmers\u27 decisions in obtaining herd replacements; and (3) to estimate actual and opportunity cost of obtaining replacements by various methods