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  • 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.
31

The spiral-pole antenna: An electrically small, resonant hybrid dipole with structural modification for inherent reactance cancellation

Khair, Ishrak 22 August 2011 (has links)
"A small “spiralpole” antenna – the hybrid structure where one dipole wing is kept, but another wing is replaced by a coaxial single-arm spiral, is studied both theoretically and experimentally. Such a structure implies the implementation of an impedance-matching network (an inductor in series with a small dipole) directly as a part of the antenna body. The antenna impedance behavior thus resembles the impedance behavior of a small dipole in series with an extra inductance, which is that of the spiral. However, there are two improvements compared to the case when an equivalent small dipole is matched with an extra lumped inductor. First, the spiralpole antenna has a significantly larger radiation resistance – the radiation resistance increases by a factor of two or more. This is because the volume of the enclosing sphere is used more efficiently. Second, a potentially lower loss is expected since we only need a few turns of a greater radius. The radiation pattern of a small spiralpole antenna is that of a small dipole, so is the first (series) resonance. The Q-factor of the antenna has been verified against the standard curves. The antenna is convenient in construction and is appealing when used in conjunction with passive RFID tags such as SAW temperature sensors. "
32

En studie om sagoberättandets användning inom förskolan

Richt, Emma, Walfridsson, Therese January 2011 (has links)
Syftet i denna studie är att få ökad förståelse för hur förskollärare använder sagoberättandet i relation till barnens språkutveckling. Vi har utgått från frågeställningarna: På vilket sätt främjas barnens språkutveckling genom sagoberättandet enligt förskollärarna samt vilka metoder säger de sig använda för att gynna barnens språkutveckling? I den teoretiska bakgrunden har vi belyst sagans struktur och sagoberättandets möjligheter för språkutvecklingen. Vi har under arbetets gång haft ett sociokulturellt perspektiv, vilket hör ihop med vårt sätt att se på lärandet. Med det sociokulturella perspektivet menas att miljö och samspel med andra har betydelse i lärandet. Kvalitativa intervjuer har genomförts med sex förskollärare och är vår datainsamlingsmetod i denna studie. Resultatet har vi tolkat med hjälp av den hermeneutiska spiralen vilket innebär en tolkning av texten med strävan att få fram en innebörd och mening som respondenten haft. Studien visar att förskollärarna anser att sagoberättandet är en viktig del i språkutvecklingen. Sagoberättandets metoder som använts är läsa högt, muntligt berättande och dramatisering av sagor.  Användningen av dessa metoder varierar mellan de förskollärare som ingick i studien. Resultatet visar att antalet barn har en påverkan i förskollärarnas val av metoder vid sagoberättandet.
33

Integration i ämnet idrott och hälsa. : En kvalitativ undersökning via observationer och intervjuer av lärare som arbetar i skolor där majoriteten av eleverna har utländsk bakgrund.

Gosselin, Sebastien, Shahmoorad, Arby January 2012 (has links)
Idag kan man se att Sverige är ett mångkulturellt land och den svenska skolan har blivit en mötesplats där elever med olika bakgrunder och erfarenheter dagligen träffas. Vilket kan vara en stor möjlighet till att en integration sker. Forskningen kring integrering har under de senaste åren valt att inrikta sig på att undersöka om hur läraren arbetar med eleverna med utländsk bakgrund när det gäller ämnet Idrott och hälsa.   Syftet med vår uppsats är att undersöka hur lärare i idrott och hälsa arbetar med integration i skolor där majoriteten av eleverna har en utländsk bakgrund.   För att uppnå vårt syfte har vi valt att göra en kvalitativ undersökning, genom att göra en semistrukturerad intervju med fyra lärare som undervisar i ämnet idrott och hälsa. Men innan intervjuerna skedde så observerade vi totalt 10 lektioner som komplement till intervjuerna.   Uppsatsen kommer fram till att lärarna i idrott och hälsa som deltar i studien tar till hänsyn i sin lektionsplanering och i sin undervisning när det handlar om elever med utländsk bakgrund.
34

Scalable Broadband Models for Spiral Inductors in Multilayer Organic Package Substrate

Chiu, Chi-tsung 30 July 2004 (has links)
The thesis consisted of three parts. The first part introduced designed trend of the embedded passive component and the process flow of organic substrate. A design flow of spiral inductor embedded in 4 layer organic substrate has been demonstrated. Part 2 focused on the extraction equations of conventional PI model and modified T model. These two models have been applied to develop the equivalent circuits of the organic spiral inductors . The comparison between modeling and measurement results shows their difference on modeling accuracy. Part 3 introduced the scalable equations in both modeling techniques to find the equivalent circuit parameters from inductor¡¦s geometrical parameters. A 2.4GHz band-pass filter was simulated to illustrate the application of wide band scalable modeling techniques.
35

共感におけるコミュニケーション行動研究の概観 ―共感の内的体験の特質との関連を考慮して―

田中, 伸明, TANAKA, Nobuaki 28 December 2007 (has links)
No description available.
36

A Study of Knowledge Management in the New Product development --- Taking Transportation Vihicle Industry as Example.

CHEN, Fu-An 30 July 2001 (has links)
This resreach discusses how the organization knowledge establishes itself in different steps during the process of developing a new product. The four crucial force (including technology push¡Bmarket pull¡Bfocus strategy¡Bcompetitive advantage) which affects the development of a new product function basing on the fundemental models of Leonard-Barton (1995) and the four models of Nonaka(1994). The force will interact with one another and create the spiraling of the organization knowledge. The research chooses a leading transportation manufacturer as the study case. The four steps of developing its new product are integrated into an individual case. The organization knowledge is accumulated, communicated, applied, integraged, and innovated while executing the business, applying the resource of technology, being inspired by the culture of the enterprise, as well as cooporateing with the other companies. We learned from the research that we need to understand the mechanics of the organization knowledge and to know how to apply the agent of the knowledge if we need the knowledge to be fast and unexhausted. We are to create the four force of a new product, as well as the mechanics of selecting the organization knowledge and the right direction to which the knowledge will guide us. The organization base cooperates with the execution of business, and each individual takes his or her part in the case. Thus the personal and the social knowledge can be combined and carried out effectively and established into systematic graph via socializaiton, internalization, externalization,combination. Therefore, the model of creating the organization knowledge of enterprise is formed step by step. The organization knowledge can be the core potencial and asset of the enterprise, and it will be advantage while competing with other enterprises. As for the new product, it is the full presentation of the organization knowledge of an enterprice.
37

The Model of New Product Innovation Activities Performed Company's Participate with Customer - An Example of Cultural Creative Industries

Lei, Kin-Heng 12 October 2008 (has links)
More and more traditional industries (especially have a own brand company) have invited their customers or suppliers to attend an activity which performs and coordinates new product innovation, thus, these all still have not a formal model to executed. This thesis is regarding that let company to aware demand and consuming behavior of consumer market as whole and seeking a new product creative from customer through establishing an innovation activity. This customer innovation activity model that is build up from an Ethnographic model combined with knowledge spiral and cultural creative industries for example. The combination reason is that both of ethnographic model and knowledge spiral need to supplementation with together, because its have each of advantage and disadvantage. An Ethnographic model, could be explore the customer behavior, need, taste and so on in the innovation activity; other more, knowledge spiral could be stimulate the company¡¦s staff and customer knowledge tacit. Whether the customer innovation activity model is practicable? In first step, it should verify and explore the phenomenon of cultural creative industries invited the customer to attend the innovation activities is exit. Therefore, the customer innovation activities models hypothesis verifies information is obtained by four companies or interviewers. Other than, it will be proof these hypothesis, if it has exits the phenomenon of customer attend to innovation activities invited by companies. However, the value of customer innovation activities model should within base of innovation concept, customer innovation, and customer orientation are necessary.
38

Application and evaluation of spiral separators for fine coal cleaning

Che, Zhuping. January 2009 (has links)
Thesis (M.S.)--West Virginia University, 2009. / Title from document title page. Document formatted into pages; contains viii, 72 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 46-48).
39

EVOLUTIONARY EFFECTS ON RADIALLY-VARYING PROPERTIES OF COMA CLUSTER GALAXIES

Gregory, Stephen Albert, 1948- January 1974 (has links)
No description available.
40

Lattice Symmetry Breaking Perturbation for Spiral Waves

Charette, Laurent 05 July 2013 (has links)
Spiral waves occur in several natural phenomena, including reaction fronts in two-dimension excitable media. In this thesis we attempt to characterize the motion of the spiral tip of a rigidly rotating wave and a linearly travelling wave in the context of a lattice perturbation. This system can be reduced to its center manifold, which allows us to describe the system as ordinary differential equations. This in turn means dynamical systems methods are appropriate to describe the motion of the tip. It is in such a context that we work on spiral waves. We study perturbed rotating waves and travelling waves using standard techniques from dynamical systems theory.

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