• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1571
  • 1017
  • 627
  • 492
  • 298
  • 134
  • 79
  • 76
  • 53
  • 49
  • 49
  • 47
  • 44
  • 33
  • 33
  • Tagged with
  • 5187
  • 749
  • 728
  • 588
  • 445
  • 427
  • 400
  • 361
  • 318
  • 314
  • 298
  • 290
  • 277
  • 276
  • 252
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
241

The Relationship Between Family Recreation and Relatedness in Children and Their Families

Berrett, Kristen 06 December 2010 (has links)
The purpose of this study was to provide insight into the factors contributing to relatedness in children, specifically family recreation, and to look at relatedness between family members (family relatedness), and whether or not family recreation makes a contribution to this construct. Two instruments were used to collect data for this study. The Family Leisure Activity Profile (FLAP) measured family recreation involvement and satisfaction, and the Activity-Feelings States Scales (AFS) measured child and family relatedness. The sample included elementary school children between the ages of 6 years and 12 years (n1=405), and the parents of those children (n2=405). The data showed satisfaction with family recreation activities was a significant predictor of children's relatedness with their peers. The data also showed involvement in balance family recreation activities was a significant predictor of a family's relatedness with one another.
242

Seeking Balance: Lessons to Myself

Manz, Matthew 01 January 2018 (has links)
The search for balance in my life reflects my attitude towards life itself. In seeking balance, in juggling my strengths and weaknesses, my joys and my sorrows, I seek affirmation that I am living the life I want to live. This thesis offers my own definition of balance, and outlines why it is important and how it manifests itself in my life. In examining my own story, I offer lessons to those who seek balance in their own lives. Without being prescriptive, these lessons illuminate my own views while reminding me to live life my way. What is work/ life balance? What role does exercise play in finding balance? What can we learn from losing a loved one? Can we re-examine how to explore life’s big decisions? Why is important to always have something to look forward to? And why would someone want to study this topic? By approaching these questions using Scholarly Personal Narrative, I invite the wisdom of other scholars to influence my own views. Yet while these scholars – and the equally important wisdom from friends and loved ones – help shape my perspective, the stories I offer are, ultimately, my own. Through these stories, through my “lessons to myself,” I seek equanimity and clarity in my approach to life.
243

Present Livestock Feed Balance, Projected Feed Requirement and Potential for the State of Utah

C., Roberto Savelli 01 May 1972 (has links)
The objectives of this thesis ~ Present feed production was obtained from published data . Livestock feed requirements were calculated using factors published in Lives tock- Feed Relationships, a publication of the United States Department of Agriculture. The projections of feed requirements to 1980 were made by projecting livestock numbers based on a least squares analysis of past trends. Utilizing the projected numbers permits calculation of t he feed requirements. Feed production in 1980 was obtained by projecting past feed production and by applying least squares analysis to obtain a predicting equation that allows projection to 1980. Separate predictions were made for roughage and feed grains. Utah will have a feed grain deficit totaling about 407,000 tons in 1980. The state will have an estimated roughage surplus ranging from about 250 , 000 tons to 825,000 t ons depending on the base period selected.
244

Estudio experimental del efecto de la profundidad del nivel freático en la evaporación de un suelo arenoso no saturado

Amesti Mujica, Pedro de January 2018 (has links)
Ingeniero Civil / La evaporación es uno de los procesos determinantes en el balance hidrológico de una cuenca, especialmente en zonas del Altiplano de la cordillera de los Andes donde toda el agua que precipita dentro de la cuenca es evaporada al interior de ella, tanto desde suelos saturados como no saturados. Las variaciones en la tasa de evaporación dependen tanto de las condiciones atmosféricas (humedad, temperatura, viento, etc.) como de las características del suelo (conductividad hidráulica, porosidad, conductividad termal, etc.). En este trabajo se estudió experimentalmente el efecto que tiene el nivel freático en la evaporación de un suelo arenoso no saturado. Para esto, se construyó una instalación experimental que permite medir la evaporación en dos estanques que contienen un suelo arenoso idéntico, pero que difieren en su grado de saturación. Esto es, uno de estos estanques se encuentra constantemente saturado, mientras que el otro sólo está saturado al inicio de las experiencias, pero luego baja su grado de saturación (acompañado de un descenso del nivel freático) a medida que el agua contenida se evapora. También, se dispone de una estación meteorológica y de sensores que permiten medir viento, temperatura del aire, temperatura del suelo, humedad relativa y humedad de la superficie. El montaje experimental y la estación se instalaron en la terraza del tercer piso del edificio de Ingeniería Civil de la Universidad de Chile, expuestos a variaciones naturales de radiación solar, viento, temperatura y humedad del aire. Adicionalmente, se cuenta con mediciones de laboratorio de las propiedades del suelo como conductividad hidráulica del suelo saturado, porosidad del suelo y ancho de la franja capilar del suelo. Para el análisis de las mediciones, se presenta un marco teórico que permite postular la existencia de un número adimensional que se desprende de la razón entre la evaporación y la evaporación máxima del agua contenida en un suelo. Este número adimensional está dado por Kad/D, donde Ka es la velocidad de transferencia del vapor de agua hacia la atmósfera, d es la profundidad del suelo a la cual se encuentran condiciones saturadas, y D es el coeficiente de difusión de vapor de agua en el suelo. A partir de los resultado experimentales se validó satisfactoriamente el marco teórico para el cálculo de la evaporación desde suelos no saturados, que contempla tanto procesos de transferencia de vapor de agua en la atmósfera, como en el suelo. De igual forma, se analizó la variabilidad de la tasa evaporativa respecto a las variaciones de temperatura del aire, de temperatura de los suelos, y de la profundidad del nivel freático. Se analizó la relación del número adimensional con la evaporación y la evaporación máxima, se concluyó acerca de su validez y de los parámetros que componen dicho número. Finalmente, se formulan supuestos y se mencionan algunas consideraciones a tomar para estudios de futuros experimentos. / Este trabajo ha sido parcialmente financiado por proyecto FONDECYT N° 1170850
245

Propuesta de negocio enfocado en la mejora de la productividad en la construccion de edificaciones haciendo uso de drones

Arévalo Flores, Jefree Stefano, Delgado Manzanares, Carlos Francisco, Vitor Zarate, Josué Fidel 01 June 2019 (has links)
Todo proyecto de construcción, independiente de su tamaño tiene una alta complejidad de gestión debido a la gran cantidad de recursos que administra en cada una de las etapas constructivas. El recurso más sensible para todo residente de obra es el humano; sobre todo el personal obrero, que es el que finalmente transforma los insumos en productos con valor. Controlar este recurso se vuelve entonces muy necesario, y establecer un indicador que permita tomar decisiones que vayan al ritmo de la ejecución del proyecto es vital para el éxito de la gestión. En esta investigación se realizó una evaluación de la mano de obra en dos proyectos de edificación, usando herramientas de medición tecnológicas como los drones y control de la productividad, lográndose una reducción significativa de tiempos no productivos. Se valorizó el monto económico virtualmente ganado de esta mejora y se estableció, que con un porcentaje de esta cantidad ahorrada, es posible desarrollar una propuesta de negocio rentable enfocado en la medición y mejora de la Productividad. / Tesis
246

Taking strategic interactions seriously : a rationalist approach to power transition theory

Henripin, Olivier. January 2007 (has links)
No description available.
247

Comparison of techniques for measuring the water content of soil and other porous media

George, Brendan Hugh January 1999 (has links)
The measurement of water in soil on a potential, gravimetric or volumetric basis is considered, with studies concentrating on the measurement of water by dielectric and neutron moderation methods. The ability of the time-domain reflectometry technique to measure water content simultaneously at different spatial locations is an important advantage of the technique. The reported apparent dielectric by the TRASE� time-domain reflectometer and Pyelab time-domain reflectometry systems is sensitive to change in extension cable length. In some soil, e.g. a commercial sand, the response to increasing extension length of extension cable is linear. For other soil a linear response occurs for certain lengths of cable at different moisture contents. A single model accounting for clay content, extension cable length, time-domain reflectometry system, probe type and inherent moisture conditions explained 62.2 % of variation from the control (0 m extension) cable. The extension cable causes a decrease in the returning electromagnetic-wave energy; leading to a decline in the slope used in automatic end-point determination. Calibration for each probe installation when the soil is saturated, and at small water contents is recommended. The ability of time-domain reflectometry, frequency-domain and neutron moderation techniques in measuring soil water content in a Brown Chromosol is examined. An in situ calibration, across a limited range of water contents, for the neutron moderation method is more sensitive to changing soil water content than the factory supplied 'universal' calibration. Comparison of the EnviroSCAN� frequency-domain system and the NMM count ratio indicates the frequency-domain technique is more sensitive to change in soil water conditions. The EnviroSCAN� system is well suited to continuous profile-based measurement of soil water content. Results with the time-domain reflectometry technique were disappointing, indicating the limited applicability of time-domain reflectometry in profile based soil water content measurement in heavy-textured soil, or soil with a large electrical conductivity. The method of auguring to a known depth and placement of the time-domain reflectometry probe into undisturbed soil is not recommended. A time-domain reflectometry system is adapted for in situ measurement of water in an iron ore stockpile. The laboratory calibration for water content of the processed iron ore compares favourably to a field calibration. In the field study, the 28 m extension cable used to connect the probes to the time-domain reflectometry affected the end-point determination of the time-domain reflectometry system. To account for this, 0.197 should be subtracted from the reported apparent dielectric before calculation of volumetric moisture content.
248

Estimation of evapotranspiration fluxes at the field scale : parameter estimation, variability and uncertainties

Hupet, François 16 December 2003 (has links)
The estimation of evapotranspiration (ET), a key process within the Earth's surface water and energy balance, remains an important challenge for a wide range of disciplines such as surface hydrology, irrigation management and meteorology. However, notwithstanding the considerable progress recently made in our understanding of the physical and biological processes governing ET, the accurate quantification of ET is very tricky to achieve, even at a limited spatial scale. In this study, we combine field measurements with numerical experiments to tackle issues related to the quantification of ET and the associated uncertainties for a maize cropped field using two different approaches, i.e. the agro-hydrological modelling and the soil water balance approach. For the agro-hydrological modelling, we mainly focus on the estimation of field-scale soil water content and on the identification of root water uptake parameters. With regard to the field-scale soil water content, we put forward that the within-field variability is large and that the maize crop plays a non-negligible role in the development of the soil water content patterns both at the field and at the maize row scale. For deriving root water uptake parameters (RWUP), we develop and test two different approaches, i.e. the simplified soil water balance and the inverse modelling approach. Using numerical experiments, we show that the simplified soil water balance approach produces quite accurate RWUP. On the other hand, the inverse modelling approach is only successful for some soils and for some conditions due to instability and nonuniqueness issues. For the soil water balance approach, we show that the accuracy of the local ET estimate is strongly dependent on the estimation method used to derive the bottom fluxes and that the use of pedotransfer functions is of little interest. For field-scale ET estimates, we show that the variability of ET is large both at the field scale (due to the variable crop growth) and at the maize row scale (due to the maize row layout). To produce accurate field-scale ET estimates, we suggest to scale up maize row scale ET estimates using the concept of temporal stability or using a covariant such as the Leaf Area Index. The results of our study suggest that the estimation of water fluxes or associated state variables for a row cropped field requires a two-step upscaling strategy, from the local scale to the row, then from the row to the field scale.
249

Decision Support System (DSS) for Machine Selection: A Cost Minimization Model

Mendez Pinero, Mayra I. 16 January 2010 (has links)
Within any manufacturing environment, the selection of the production or assembly machines is part of the day to day responsibilities of management. This is especially true when there are multiple types of machines that can be used to perform each assembly or manufacturing process. As a result, it is critical to find the optimal way to select machines when there are multiple related assembly machines available. The objective of this research is to develop and present a model that can provide guidance to management when making machine selection decisions of parallel, non-identical, related electronics assembly machines. A model driven Decision Support System (DSS) is used to solve the problem with the emphasis in optimizing available resources, minimizing production disruption, thus minimizing cost. The variables that affect electronics product costs are considered in detail. The first part of the Decision Support System was developed using Microsoft Excel as an interactive tool. The second part was developed through mathematical modeling with AMPL9 mathematical programming language and the solver CPLEX90 as the optimization tools. The mathematical model minimizes total cost of all products using a similar logic as the shortest processing time (SPT) scheduling rule. This model balances machine workload up to an allowed imbalance factor. The model also considers the impact on the product cost when expediting production. Different scenarios were studied during the sensitivity analysis, including varying the amount of assembled products, the quantity of machines at each assembly process, the imbalance factor, and the coefficient of variation (CV) of the assembly processes. The results show that the higher the CV, the total cost of all products assembled increased due to the complexity of balancing machine workload for a large number of products. Also, when the number of machines increased, given a constant number of products, the total cost of all products assembled increased because it is more difficult to keep the machines balanced. Similar results were obtained when a tighter imbalance factor was used.
250

A case study on the median enterprise implements the Balanced Scorecard and the Competency Model.

Ku, Yu-hsuan 09 August 2007 (has links)
The development because of information science and technology, and the transition of economic structure, economic development has already been changed into globalization economy from national economy entered a new era in 2000 so what position of finding enterprises and the future opportunity, namely become all managers to chase from the guide goal, the tactics are to help enterprises to find the direction of development and niche existing in the future, reach this tactics goal to need according with and organizing talents of the demand. This research purport lies in carrying out the balance scorecard and setting up strategy maps with the company, build and construct by four literary compositions surface index of the strategy maps, in order to reach the goal that enterprises manage, and inspect complete degree of the human capital of the company in view of the above, on the drop gap of the human capital, through the setting-up of the function model , find out the key competitiveness of the company, already training existing human capital , or by recruiting and finding talents who accords with company's key ability. After case study, find mainly: 1.The strategy must need the support and approval of the high-order executive, construct the surface in four phases of balance scorecard, can help the company with the financial affairs and not manage by financial indexes, and pass the expansion of the strategy maps, the administrator can understand the course that the strategy carry out by this, find out the of the question, but not only have the appearing of the last result. 2.The setting-up of human capital is to quite consume the time and energy, with the setting-up of the competency model, can first inspect existing staff's behavior index of finding out the so-called the outstanding one of work again , and can develop , train even find out the successors.

Page generated in 0.0483 seconds