Um die anderen Arten von Veröffentlichungen zu diesem Thema anzuzeigen, folgen Sie diesem Link: Wage form.

Dissertationen zum Thema „Wage form“

Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an

Wählen Sie eine Art der Quelle aus:

Machen Sie sich mit Top-50 Dissertationen für die Forschung zum Thema "Wage form" bekannt.

Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.

Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.

Sehen Sie die Dissertationen für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.

1

Pavličková, Martina. „Spokojenost zaměstnanců, motivace a odměňování ve vybraném podniku“. Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2021. http://www.nusl.cz/ntk/nusl-442960.

Der volle Inhalt der Quelle
Annotation:
The diploma thesis deals with employee satisfaction, their motivation and remuneration. In my work I focused on examining the satisfaction of employees of the selected bank with motivation and remuneration. The presented work has 3 main parts. The first part is focused on the theoretical description of the basic concepts needed to understand the issue. The second part contains an analysis of the submitted questionnaire. The last part contains suggestions for improving the system in the company.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
2

Barnard, G. A. (Geoffrey Alan). „Inter-industry wage differentials and the role of workers' concern for equity“. Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34696.

Der volle Inhalt der Quelle
Annotation:
This thesis seeks to add to the understanding of wage determination in Canada. Data from the Labour Market Activity Survey and the Survey of Displaced Workers are analysed to indicate the degree to which wages for workers of given observable characteristics vary across industries. Possible explanations for such differentials are considered, with market-clearing models argued to be unconvincing compared to the main alternative, efficiency-wage theory, which allows for a persistent distribution of labour rents across industries. In particular, the key mechanisms in versions of the efficiency-wage hypothesis appealing to workers' concern for fairness are found to be relatively free of persuasive objections, and to be supported by a substantial body of theoretical and empirical work in social psychology and sociology, as well as in economics. The extent to which the observed inter-industry wage differentials can be explained in terms of posited mechanisms for the operation of workers' concern for fairness is then examined. Some indications of the influence of the concern for equity on inter-industry wage differentials are found, although limitations in the data and multicollinearity among regressors restrict the ability to isolate different industry-specific effects. It is concluded that while there is both a theoretical and an empirical basis for the proposition that workers' concern for fairness plays a role in the determination of wages in Canada, more work on this question, ideally combined with the availability of comprehensive firm-level data, is needed to get a more precise idea of the extent of this influence.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
3

Guzzetta, Judith T. „Executive compensation : performance for pay“. Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/24519.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
4

Khangala, Lavinia Musiwa. „Minimum wage fixing for domestic employees“. Master's thesis, University of Cape Town, 1994. http://hdl.handle.net/11427/17505.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
5

Feinberg-Danieli, Goldie. „Regression results of the union impact on pay levels in New Zealand public service : a thesis submitted to the Victoria University of Wellington in fulfilment of the requirements for the degree of Master of Commerce and Administration /“. ResearchArchive@Victoria e-Thesis, 2009. http://hdl.handle.net/10063/1069.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
6

Smith, Teresa L. „The role of ability to pay and internal labor market processes in wage and gender-related wage differentials“. Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54432.

Der volle Inhalt der Quelle
Annotation:
This research attempts to identify factors that influence wage and gender-related wage differentials across organizations. Specifically, the purpose was to investigate the role of ability to pay, willingness to pay, and organizational characteristics in wage determination and the development of gender-related wage differentials at the organizational level. The sample chosen for the study included 160 doctoral-granting, public universities across the United States. Average wages at three levels of full, associate and assistant professor ranks were examined. Results of the study indicate that ability to pay and willingness have a significant positive impact on wages across organizations. The organizational characteristics of size, geographic location and unionization also have a significant impact on wage determination. Results also indicate that even after accounting for the influence of ability and willingness to pay and organizational characteristics on wages, the percentage of women in the organization still has a significant negative effect on wages at all ranks, and on the wages of both men and women. Findings further suggest that there is a significant differential between the average wages of men and women both within and across the universities that is not accounted for by the structural characteristics of the organization.
Ph. D.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
7

Wenger, Christian W. „Analysis of Two-point Turbulence Measurements for Aeroacoustics“. Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/30837.

Der volle Inhalt der Quelle
Annotation:
Simultaneous two-point three-component four-sensor hot-wire velocity measurements taken in three flows of aeroacoustic interest are here analyzed. The analyses provide information on the turbulence structure of the flows as it would be encountered by hypothetical noise producing blades passing through the flows. Two-point measurements taken in the first flow, a lifting wake from a rectangular NACA 0012 half wing, are used to calculate space-time correlation functions and 'pointwise' wave number frequency spectra. Two upwash spectra, calculated for locations in the region of the wake that is roughly homogenous in the spanwise direction, are direct estimates of the full wave number frequency spectra at their locations. As such, they are used to perform aeroacoustic calculations, and the results are compared to results achieved using the von Kármán isotropic spectrum. Amiet's approximation, where the wave number frequency spectra can be represented by the correlation length scales is found to hold reasonably well for the measured spectra.

The two-point measurements in the second flow, a vortex/blade-tip interaction, are analyzed to provide information useful to researchers of blade-wake interaction noise produced by helicopter rotors. Space-time correlation functions and wave number frequency spectra are calculated for five cuts through the region of interaction. The correlation functions provide information concerning the turbulence length scales found in the interaction region. The spectra are compared to the von Kármán isotropic spectrum and found to be greatly different. However, the spectra do bear some resemblance to spectra calculated in the spanwise homogenous region of the lifting wake.

The two-point measurements taken in the third flow, the wake from a fan cascade, are analyzed to provide information of use to modelers of broadband noise produced through rotor wake/stator interactions. In particular, space-time correlation functions are calculated for a grid of two-point measurements, which allows the estimation of the turbulence structure as seen by a passing stator blade. Space-time correlation functions and wave number frequency spectra are calculated for various stator configurations. The implications of engine operating speed and stator configuration for broadband noise production are discussed.

[Vita removed March 2, 2012. GMc]
Master of Science

APA, Harvard, Vancouver, ISO und andere Zitierweisen
8

Douglas, Tami Diane. „Perceptions of fairness and the wage setting process“. CSUSB ScholarWorks, 1990. https://scholarworks.lib.csusb.edu/etd-project/773.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
9

Yucedag, Arfe. „Wage differences between male and female teachers in Turkey /“. Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
10

Towey, Shawn K. „Working for a Living Wage in Philadelphia“. Master's thesis, Temple University Libraries, 2010. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/67542.

Der volle Inhalt der Quelle
Annotation:
Urban Studies
M.A.
The living wage movement swept American cities in the mid-1990s, bringing new attention to working poverty and challenging the economic development ethos of urban regimes. This case study of the living wage in Philadelphia merges regime theory and social movement theory to explain the outcomes of two very different campaigns in 1997-1999 and 2005. Documents were examined and interviews were conducted with a variety of actors in social movement organizations, a union, and from within the regime. Socioeconomic conditions created fertile ground for economic justice advocates and constrained the actions of the regime, but did not determine the outcome of the campaign. A social movement analysis explains, in part, why the coalition lacked capacity to challenge the regime in the earlier campaign, although a similar level of mobilization was adequate in other cities with Democratic regimes. Regime theory provides insights into why the governing coalition mounted opposition in 1998, yet allowed an ostensibly similar bill to pass in 2005. By 2005 social movement organizations were operating on a different geographic scale, and had adopted new strategies that allowed them to use a weak living wage bill (and to be used in turn by a regime politician) as a means to an end, which was to impact working poverty statewide. There has been inadequate enforcement of a policy passed from within city council, without involvement of direct stakeholders.
Temple University--Theses
APA, Harvard, Vancouver, ISO und andere Zitierweisen
11

Raghunath, Madhu M. 1974. „A living wage : strategies for implementation of the minimun wage : the case of the Indian beedi industry“. Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/69430.

Der volle Inhalt der Quelle
Annotation:
Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 2001.
Includes bibliographical references (leaves 100-103).
92% of India's total workforce (approximately 320 million workers) is employed in the unorganized sector. Out of these, 4.4 million workers are employed by the beedi (indigenous cigarette) industry. Annually, this industry contributes nearly 13% of the total indirect taxes to the central government. The beedi industry is highly mobile in nature. It is also one of the most exploitative labor intensive industries in India. The industry thrives on the cheap cost of production and locates in regions that have low wages. Most of the production in the beedi industry is carried out by subcontracting, where the workers are exploited in terms of low wages, lack of social security benefits and poor working conditions. In 1966, the Government of India enacted the Beedi and Cigar Workers (Employment of Conditions) Act to protect the workers from exploitation, provide the workers with minimum wages and social security benefits. The Act allows a state government to fix its own minimum wages. This has resulted in varying rates of minimum wages across states. States that have enforced higher minimum wages have witnessed an industrial flight of the beedi firms, leaving behind thousands of unemployed workers. Further, the enforcement and implementation of the Act has been very ineffective. The report identifies successful strategies for implementation of minimum wages in the beedi sector by analyzing the cases of the Kerala Dinesh Beedi Cooperative and the Self Employed Women's Association. These organizations have been successful in their approaches because they were able to 1) organize beedi workers into trade unions and cooperatives, 2) garner political support for their movement, and 3) compete with other beedi producers in the country. The report recommends that implementation of the minimum wages in the beedi industry in India can be achieved by a) developing a national minimum wage policy for the beedi industry, and b) increased cooperation between the trade unions, government, NGO's, political parties, employers and beedi workers.
by Madhu M. Raghunath.
M.C.P.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
12

Olli, Segendorf Åsa. „Job Search Strategies and Wage Effects for Immigrants“. Doctoral thesis, Stockholm University, The Swedish Institute for Social Research (SOFI), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-682.

Der volle Inhalt der Quelle
Annotation:

Recruiting Through Networks - Wage Premiums and Rewards to Recommenders

This paper examines the firm's use of recommenders in its recruiting process. In the model, recommenders possess personal information about the worker's ability and about the workplace. In view of this private information, the firm may reward recommenders for good recruiting, thus using recommenders as a screening device. In equilibrium the expected skill of a worker is higher if recruitment has occurred through a recommender rather than through the market, but there is no wage premium. Swedish survey data supports the absence of a wage premium for recommended workers. It has not been possible to test the expected skill or the firm's reward policy vis-à-vis the recommender.

Job Search by Immigrants in Sweden

This paper analyses the job search strategies of immigrants born outside Europe and compares these with the search strategies of the native population. The analysis uses unique Swedish data gathered during 1998. Two clear patterns can be traced in the empirical analysis: immigrants search more intensively than natives; also, the greater search intensity is a requisite for getting a job. Specifically, the first analysis shows that immigrants who got jobs were likely to have used networks or direct contact with employers to a greater extent than natives. Immigrants who got jobs had submitted more applications and spent more time on job search than natives, while those who did not get jobs had not spent more time on job search than natives. The fourth and last analysis looks at the number of methods used in job search. Immigrants who left unemployment had not used more methods than natives. On the other hand, immigrants who remained unemployed had used significantly more methods than natives, indicating that it is not necessarily productive to use too many methods.

Wage Effects of Search Methods for Immigrants and Natives in Sweden

Using unique cross-section survey data collected in 1998, this study examines whether successful job-search method differ between natives and immigrants from outside Europe, and whether there is a wage difference between the two groups associated with the search method used.

It is found that those individuals from outside Europe who got jobs did relatively better when using formal methods than when using informal ones.

Next, a wage analysis has been performed, which shows that there is an overall wage discount for those born outside Europe. The discount is larger when using informal methods rather than formal.

To explore this further the informal method measure is divided in two parts, one part for contacts through friends and family and the second for contacts with the employer. The penalty for immigrants from outside Europe using an informal method as a successive job-search device is partly explained by contact with the employer, suggesting that the penalty for using informal methods has been underestimated in previous studies.An attempt has also been made to control for the effect of unobservable characteristics on wages, but this did not have any significant impact.

APA, Harvard, Vancouver, ISO und andere Zitierweisen
13

Olli, Segendorf Åsa. „Job search strategies and wage effects for immigrants /“. Stockholm : Swedish Institute for Social Research (SOFI), Stockholm University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-682.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
14

Nuckols, Donald Bert. „Factors affecting post-service wage growth for veterans“. Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26540.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
15

Doiron, Denise J. „Wage and employment contracts as equilibria to a bargaining game : an empirical analysis“. Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27001.

Der volle Inhalt der Quelle
Annotation:
The object of this research is to study how unions and firms divide the surplus or rents available to them. Many instruments are used in practice to make this division, but standard micro data only includes two: wages and employment. I use a new approach to study wage and employment contracts as I consider them equilibrium points in a noncooperative bargaining game. This work is an extension of wage-employment determination models, the extension being the incorporation of a bargaining model, specifically, a Rubinstein bargaining game. Given the objective functions of the two players, the wage and employment equations are specified by the equilibrium conditions for the game. Also, additional determinants of the contracts are identified. One of the characteristics of the model is that the wage and employment contracts are affected by the relative strike costs of the two negotiating parties even in the absence of strikes. The data involve the B.C. wood products industry and the IWA, a powerful union believed to have been successful at capturing rents. The data include input and output quantities and prices and equations representing input demands and output supply are estimated simultaneously with the negotiated wage and employment equations. Four estimation models are derived corresponding to two bargaining frameworks and two sets of assumptions on the firms' technology. The two bargaining frameworks correspond to two polar cases that have been assumed in the wage-employment determination literature: in one case, the wage is set through bargaining while the employment level is chosen by the firm, in the second case, both the wage and employment level are negotiated. In one pair of models, output is treated as exogenous to the bargaining while in the second set of models, output is endogenous and capital is exogenous. The bargaining game is successfully implemented in the sense that technology and union utility parameters are generally reasonable and comparable to previous estimates. Also, the determinants of relative strike costs enter significantly in the estimation. The union is seen to care about employment as well as the wage with slightly more weight being placed on the employment level. Rent maximization is always rejected. Bargaining powers are calculated at each data point and results indicate that the 1980's recession increased the relative power of the union. The hypotheses of equal bargaining powers and complete union bargaining power are tested and rejected. Also, the proportion of rents captured by the firm is found to be a poor indicator of its bargaining power. Although the qualitative results mentioned above are robust across the four models, parameter values are generally sensitive to both the technology assumptions and the bargaining framework. Ignoring the simultaneity of wages, employment and other variables chosen by the firm can be very misleading. Finally, the model in which both wages and employment are negotiated consistently performs better than the framework in which employment is unilaterally set by the firm.
Arts, Faculty of
Vancouver School of Economics
Graduate
APA, Harvard, Vancouver, ISO und andere Zitierweisen
16

Scutt, Jocelynne A. History &amp Philosophy Faculty of Arts &amp Social Sciences UNSW. „Wage rage: the struggle for equal pay and pay equity in Australia“. Awarded by:University of New South Wales. History & Philosophy, 2007. http://handle.unsw.edu.au/1959.4/40563.

Der volle Inhalt der Quelle
Annotation:
This is an interdisciplinary thesis in women's and gender studies combining legal analysis with archival research. It traverses Australian women's struggle for equal pay and pay equity from the end of the nineteenth century to the beginnings of the twenty-first. It recounts and analyses women's activism through campaigns targeting state and federal politicians, prime ministers, premiers and state and federal ministers for labour and industrial relations; engagement in the industrial arena; and through women's organisations and work with the trade union movement. The thesis analyses achievements and setbacks through the federal industrial arena, and references, too, major state industrial cases and legislation. It analyses women's intervention and impact in the Equal Pay, Minimum Wage, Basic Wage and National Wage Cases. Through archives, original letters, articles, pamphlets, books, interviews and other sources, the thesis recounts women's agreements and disagreements on how the struggle would be won, and the solid campaigning in which women engaged from the late years of the nineteenth century, through every decade of the twentieth, and in the first years of the first decade of the twenty-first century. It covers a span of over one hundred years, during which the claim was characterised as one for equal pay, the rate for the job and, more recently, pay equity. Looking at the past and the present, the thesis concludes that women's direct engagement with the industrial system and parallel working within women's organisations and trade unions has been central to gains in equal pay and pay equity. Apart from women's and men's earnings in Scandinavia, relativities between women's and men's wages and salaries in Australia have been -- despite the disparity - the most approximate of all OECD countries. The thesis posits that it is only with a return to centralised wage fixing, with women's organisations intervening and bringing their own experts to educate industrial commissions, employers and unions, that the value of women's work will be recognised as equal to the value of men's work, and equal pay, the rate for the job, or pay equity will be achieved.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
17

Hazell, Jonathan. „New slow wave structures for travelling wave tubes“. Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59703.

Der volle Inhalt der Quelle
Annotation:
This thesis covers the design of slow wave structures for travelling wave tubes, with a specific focus on those that could be used for operation at millimetre or shorter wavelengths. Serpentine and a coupled cavity photonic crystal structure are covered in detail, together with the interaction between the electromagnetic waves they support and the electron gun and magnetic beam focusing systems needed for a travelling wave interaction. In Chapter 2, the existing small-signal theory of the travelling wave interaction is introduced and applied to a serpentine travelling wave tube. A set of synthesis equations for the serpentine structure are then derived from the analysis and verified with simulation. In Chapter 3, possible improvements to the serpentine structure for high frequency operation, and operation on harmonics other than the fundamental (for both the phase and the interaction impedance) are considered. From the investigation it can be concluded that higher harmonics allow a larger beam current than the fundamental. In Chapter 4, slow wave structures based on photonic crystals are proposed for use in travelling wave tubes. A specific photonic crystal arrangement – the coupled resonator optical waveguide (CROW) - that does not appear to have been studied previously in this application is then investigated. The conclusion is that a CROW is suitable for use in a travelling wave tube and is significantly more manufacturable than existing approaches. In Chapter 5, the design of a full electron beam system for use with both the original and the improved slow wave structures is presented. The design of an electron gun, cathode and collimating magnet using an immersed flow insertion are all covered in detail. In Chapter 6, conclusions are drawn and avenues for possible future work are presented.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
18

Yoon, Soohyun. „Sex segregation and gender wage gap in Korea, 1971-1998 /“. free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p3091985.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
19

Van, Deurzen Cathy A. „Designing a custom hourly wage classification system tool to be company specific for The Cheese Company“. Menomonie, WI : University of Wisconsin--Stout, 2006. http://www.uwstout.edu/lib/thesis/2006/2006vandeurzenc.pdf.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
20

Andersson, Erica, und Ida Knutsson. „Immigration - Benefit or harm for native-born workers?“ Thesis, Linnéuniversitetet, Institutionen för nationalekonomi och statistik (NS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53829.

Der volle Inhalt der Quelle
Annotation:
The aim of our study is to investigate the effect of immigrants on wages for natives with divergent skill level within one country. Skill level is measured as education level and the purpose is to focus on the level where it according to us is a lack in research, namely the effect on high skilled native-born worker wages. Further, our contribution to the already existing studies may be considered to be a complement. Using panel data, collected from the time period 2000-2008 for the 290 municipalities in Sweden to get regional variation, we investigate and interpret the estimated outcome of how wages for native-born workers in the Swedish labor market respond to immigration into Sweden. The main findings, when controlling for age, unemployment, and differences between year and municipalities in this study are on the short run, in line with the theory. The closer to a substitute the native-born and foreign-born workers are, the greater are the adverse effect on the wage for native-born, given that we assume immigrants as low skilled. The effect on wage for high skilled native workers in short run, when assuming immigrants and natives as complement, is positive, i.e. the wage for high skilled natives increases as the share of immigrants increases. The effect on high skilled native-born wages is positive even in mid-long run and adverse for the low and medium skilled native-workers. This is not an expected outcome since we according to theory predict the wage to be unaffected in mid-long run. This may be the result of errors in the assumption that immigrants are low skilled, or that five years is a too short time to see the expected effect in the long run; the Swedish labor market may need more time to adjust to what we predict the outcome to be.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
21

Pölder, Robert. „Wage Dispersion and Employment for People With Low Skill : Sweden Compared to Six European Countries“. Thesis, Linnéuniversitetet, Institutionen för nationalekonomi och statistik (NS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-55590.

Der volle Inhalt der Quelle
Annotation:
This paper investigates in what way employment for low-skilled workers is connected to the wage dispersion in a country by comparing Sweden to six European countries. Previous research on this topic used cross-section analysis, but this essay takes another approach by comparing the changes in the wage dispersion and employment and by breaking down the change in the wage dispersion into parts and studying the change in the wage for different percentiles. The paper finds that wages in Sweden have not converged, which likely contributed to the increase in the employment gap between people with high and low skills. Two countries with different development were Germany and Norway. In line with recent research, in Germany, wage inequality increased and the employment gap between people with high and low skills decreased. In comparison, the case of Norway has not received much attention among researchers. Wages converged more in Norway than in Germany, yet employment increased more in Germany. The paper suggests a potential explanation: wages for the bottom percentiles of the earnings distribution fell in Germany, which it did not in Norway.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
22

Rahm, Magnus. „Ocean Wave Energy : Underwater Substation System for Wave Energy Converters“. Doctoral thesis, Uppsala universitet, Elektricitetslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-112915.

Der volle Inhalt der Quelle
Annotation:
This thesis deals with a system for operation of directly driven offshore wave energy converters. The work that has been carried out includes laboratory testing of a permanent magnet linear generator, wave energy converter mechanical design and offshore testing, and finally design, implementation, and offshore testing of an underwater collector substation. Long-term testing of a single point absorber, which was installed in March 2006, has been performed in real ocean waves in linear and in non-linear damping mode. The two different damping modes were realized by, first, a resistive load, and second, a rectifier with voltage smoothing capacitors and a resistive load in the DC-link. The loads are placed on land about 2 km east of the Lysekil wave energy research site, where the offshore experiments have been conducted. In the spring of 2009, another two wave energy converter prototypes were installed. Records of array operation were taken with two and three devices in the array. With two units, non-linear damping was used, and with three units, linear damping was employed. The point absorbers in the array are connected to the underwater substation, which is based on a 3 m3 pressure vessel standing on the seabed. In the substation, rectification of the frequency and amplitude modulated voltages from the linear generators is made. The DC voltage is smoothened by capacitors and inverted to 50 Hz electrical frequency, transformed and finally transmitted to the on-shore measuring station. Results show that the absorption is heavily dependent on the damping. It has also been shown that by increasing the damping, the standard deviation of electrical power can be reduced. The standard deviation of electrical power is reduced by array operation compared to single unit operation. Ongoing and future work include the construction and installation of a second underwater substation, which will connect the first substation and seven new WECs.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
23

Zhang, Lei Ph D. Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science. „A fast 3D full-wave solver for nanophotonics“. Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39327.

Der volle Inhalt der Quelle
Annotation:
Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2007.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 57-61).
Conventional fast integral equation solvers seem to be ideal approaches for simulating 3-D nanophotonic devices, as these devices are considered to be open structures, generating fields in both an interior channel and in the infinite exterior domain. However, many devices of interest, such as optical ring resonator filters or waveguides, have channels that can not be terminated without generating numerical reflections. Therefore, designing absorbers for these channels is a new problem for integral equation methods, as integral equation methods were initially developed for problems with finite surfaces. In this thesis we present a technique to eliminate reflections, making the channel volume conductive outside the domain of interest. The surface integral equation (SIE) method is employed to take advantage of the piecewise homogeneous medium. The Poggio-Miller-Chang-Harrington-Wu (PM-CHW) formulation is formed and the boundary element method is employed to construct and solve a linear system. Moreover, the block Toeplitz matrix property and using FFT helps reduce memory requirement, and accelerate the circulant matrix vector product. Numerical experiments are presented to demonstrate that this method can effectively reduce reflections to 1%, and is easily incorporated in an fast integral equation solver.
by Lei Zhang.
S.M.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
24

De, Marichalar Alegre Alexandra. „Overtopping Converter Prototype for Electrical Generation from Wave Energy : Laboratory Test“. Thesis, KTH, Energiteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-38883.

Der volle Inhalt der Quelle
Annotation:
It is not a coincidence that over half the world‟s population live in coastal areas using the sea as a mean to develop its industry, thus the sea is present in most aspects of daily life. Because of the vital relationship with the marine environment, for many years mankind is aware of the high energy potential contained in waves. During the last hundred years, thousands patents of devices for the extraction of the energy from waves have been published. However, the researching still faces the challenge of develop the optimal wave energy converter that matches robustness, to withstand extreme marine conditions, and sensitivity, to respond the different sea states. In this thesis a scale model of a wave overtopping converter has been designed, built and tested. In this type of wave electricity converter the waves ascend a ramp, filling a reservoir located at a certain height above sea level. The stored water in the reservoir is discharged back into the sea, powering a turbine, thus generating electricity. The system is composed of a wave energy converter, at a scale of 1:100 without turbine, a test channel and a plunger type wave maker. Different sea conditions have been simulated, to assess how the different configurations of the device influence the obtained hydraulic power and flow. It has been concluded that there is an appropriate configuration of the wave electricity converter for each wave period and height. The simulated sea conditions were composed of wave periods of around a second and wave heights of about two centimeters. Finally by applying scale transformations, an estimation of the hydraulic power that the wave electricity converter would extract with this configuration in the deep waters of Tenerife South has been calculated. Summarizing, in this thesis the methodology of testing and the comparison with real conditions has been developed.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
25

De, Azevedo Jose Paulo Soares. „Application of the boundary element method to two-dimensional nonlinear gravity wave problems“. Thesis, University of Southampton, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292283.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
26

Torrens, Richard. „Numerical modelling of shock wave propagation through a layer of porous medium“. Thesis, Brunel University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342392.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
27

Davies, John P. „Techniques for the investigation of wave turbulence in water wave data“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1994. http://handle.dtic.mil/100.2/ADA288392.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
28

Northeast, David Bernard. „Hot electron bolometer sensors for millimetre-wave and terahertz wave detection“. Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6468.

Der volle Inhalt der Quelle
Annotation:
Thesis (MScEng (Electrical and Electronic Engineering))--Univerity of Stellenbosch, 2011.
ENGLISH ABSTRACT: The design and simulation of hot electron bolometer sensors for the detection of millimeter and terahertz wave radiation is presented. These devices can be used for the formation of images or for spectroscopy in these frequency ranges. Many molecules resonate and have absorption spectra over these ranges, allowing for the identi cation, non-destructively and at a distance, of the constitution of many di erent materials. The penetrating ability of the radiation makes mm-wave and THz wave detectors ideal for security imaging. The design and simulation of these devices predicts performance as mixers and as interferometers. Manufacturing processes used while fabricating these thin lm devices are outlined and experimental results are reported.
AFRIKAANSE OPSOMMING: Hierdie tesis bespreek die ontwerp en simulasie van warm-elektron bolometers vir die waarneming van millimetergolf- en terahertz-straling. Sodanige toestelle kan in bogenoemde frekwensiebereike gebruik word vir beeldvorming of spektroskopie. Aangesien heelwat molekules binne hierdie bande resoneer, kan die samestelling van 'n verskeidenheid materiale oor 'n afstand en op 'n nie-vernietigende wyse gedenti seer word. Die deurdringingsvermo van millimetergolf- en terahertz-straling maak sulke detektors ideaal vir beeldvorming in veiligheidstoepassings. Met die ontwerp en simulasie van hierdie toestelle word gewys wat hul werkverrigting as mengers en interferometers kan wees. Die prosesse wat gebruik is om hierdie dun lmtoestelle mee te vervaardig word ook bespreek en eksperimentele resultate word aangebied.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
29

Bhana, Vishal Bhooshan. „A slow-wave CMOS delay line filter for mm-wave applications“. Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/66201.

Der volle Inhalt der Quelle
Annotation:
The standardisation of the 60 - 80 GHz band by the IEEE802.15.3 task group 3C offers prospects for high speed gigabit wireless applications. This mm-wave band can be used to achieve high data rate transmission in high definition television processing and mobile data applications. Electronic devices utilising the 5th generation cellular standard will begin to use such transceiver chipsets. Nanoscale complementary metal oxide semiconductor (CMOS) technologies have enabled complete mm-wave systems-on-chip (SOC) containing distributed passive, RF active, and CMOS logic circuits. This approach offers the advantage of lower cost, reduced size and lower power consumption. Front-end filters are, however, typically omitted from this system integration due to the low achievable Qfactors of the constituent resonators, which results in high insertion loss and reduced selectivity. There is, therefore, a need for on-chip RF pre-select filters with low insertion loss that are immune to this Q-driven degradation. This research is aimed at the realisation of a miniaturised high performance passive filter in a CMOS technology for mm-wave technologies. Research questions have been formulated where the research outcomes result in a mm-wave passive filter topology. Firstly, the delay line filter is identified as a possible solution for implementation at mm-wave frequencies. Research has been conducted into CMOS planar transmission lines and their associated effects to identify the best suited geometry. Secondly, it is found that the delay performance of a transmission line can be improved by means of introducing geometrical shielding structures. The performance of the CMOS delay lines is evaluated using the quality factor (Q-factor) and group delay as a measure of importance. The delay lines are implemented within a delay line filter topology. The filter is synthesised and simulated in a circuit solver, after which the delay line and complete filter are simulated in a 3D full-wave electromagnetic (EM) simulation tool. The artwork of the complete design is exported, from the integrated circuit (IC) design tool, into the full-wave EM simulator to evaluate and verify the performance of the filter. Three slow-wave coplanar waveguide (CPW) delay lines and a passive mm-wave filter are designed and prototyped using the 0.13 _m bipolar complementary metal oxide semiconductor (BiCMOS) process from GlobalFoundries US as part of the experimental process. The best performing delay line, based on simulation results, has been implemented in a passive filter. The experimental verification confirms the 3D full-wave EM simulation results and answers the proposed research questions. Three CMOS CPW transmission lines have been manufactured and tested. Shielded CPW structures with narrow and wide strip spacings were manufactured to understand the slowwave mechanism. A third fabricated CPW with no shielding structures was used for comparison purposes. Slow-wave geometries have previously been studied, but this research focuses on the Q-factor and delay performance of the slow-wave CPW. Simulation and measured results demonstrate that the narrow strip spacing CPW achieves the greatest group delay at 70 GHz. The narrow strip spacing, wide strip spacing and no strip spacing lines achieve Q-factors of 38.3, 33.64 and 24.9 at 70 GHz respectively, with the narrow strip spacing showing a 34.9 % improvement in Q-factor compared to the no strip spacing CPW. The filter demonstrates a centre frequency of 70.05 GHz, a -3dB bandwidth of 20.74 GHz, a passband attenuation of 5.83 dB and a Q-factor of 4.82. The slow-wave filter compares well with recent literature published on CMOS mm-wave filters.
Dissertation (MEng)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
APA, Harvard, Vancouver, ISO und andere Zitierweisen
30

Abbas, Hatem. „Beamforming techniques for millimeter wave relay networks“. Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/beamforming-techniques-for-millimeter-wave-relay-networks(6cbbe216-9596-4eaf-9ee3-cd7355d5da7f).html.

Der volle Inhalt der Quelle
Annotation:
The energy and data rate requirements for the next generation cellular networks urge the need for innovative solutions. Inspired by its massive bandwidth, millimeter wave (mmWave) band is thought-out to be one of the key elements to meet the aspirations. However, mmWave links are known to have short coverage distance due to the propagation losses introduced at high frequencies. The proposed solutions to overcome the transmission challenges include using large arrays with improved directivity, adopting smaller cells, and relying on cooperative networks to extend the mmWave link and avoid shadowing areas. This work aims to improve the connectivity of the mmWave link in the outdoor environments. One of the cost effective methods is to increase the array gain by using Analogue Beamforming (ABF). The performance of the ABF system in the presence of phase quantization error has been analytically investigated. The study also includes comparing three different channel sounding techniques, namely: exhaustive search, side-to-side search, and n-tier search. The time overhead related to each method and their energy consumption are calculated. The numerical results assist in determining the optimum search period to obtain a reasonable spectral efficiency using minimal power consumption. The results also help identify the minimum number of quantization bits required to produce about ninety percent of the optimistic results. In order to extend the coverage further, relay networks are considered an essential component in mmWave communications. The performance of a single hybrid beamforming full-duplex relay system and multi-relay networks were investigated. The design algorithms for the processors in the network are proposed based on the greedy pursuit approach. The performance of the proposed algorithms is analysed under various scenarios. The analysis highlights the influence of the array size, the number of RF chains, and the length of the channel sounding period. The performance of the proposed systems is compared from both the spectral efficiency and power consumption prospects. The results also establish that the number of antennas at the source and the relay receiver arrays have a superior impact on the system performance than the sizes of the array at the destination and the relay transmitter.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
31

Andrews, Lauren. „Spatial Mismatch for Low-Wage Workers in post-Katrina New Orleans“. ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1292.

Der volle Inhalt der Quelle
Annotation:
The theme of this study is spatial mismatch, a concept that gave rise to an ever-expanding body of research concerned with how and why residential and employment distributions have shifted within cities and across metropolitan areas. The concept grew out of John F. Kain's research on how racial discrimination and segregation affects the spatial patterns of people/subgroups and jobs in the postwar American urban environment. Specifically, "Housing Segregation" posits that housing-market discrimination is at the root of increased unemployment among inner-city, nonwhite workers; concurrently, the pace and volume of decentralization (of residents and employment) from central-cities reinforces low-income, overwhelmingly African-American isolation and immobility. This study contributes to the New Orleans literature by providing a pre- and post-Katrina snapshot of spatial mismatch. The analysis addresses research questions aimed at gauging the extent to which mismatch and job-isolation have changed for poor workers in the New Orleans metro area since Hurricane Katrina.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
32

Obregon, Misael. „Wage and prestige returns for mexican american workers based on education“. Thesis, [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2600.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
33

Ibanez, Lindsey McKay. „The Reputation Game: Searching for Low-Wage Work in Urban Nicaragua“. The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531305966893766.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
34

Xu, Leilei. „Influence of In-filledTrench as Wave Barrier on Ground Vibrations“. Thesis, KTH, Jord- och bergmekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102879.

Der volle Inhalt der Quelle
Annotation:
With the development and expansion of traffic systems, problems associated with ground vibrations have required increased attention. Increasing vehicle loads,traffic volumes, and aging roads and railways,vibrations induced by traffic are gradually becoming acrucialproblem.Traffic induced vibrations have much smaller amplitude than those considered in seismic design, but may nevertheless cause annoyance for humans, damage to building, disturb sensitive equipment such as measurements devices, automated manufacturing in factories, etc. It is the purposeto study the effects of the in-filled trench (cell foamis usedas in-filled material in the test)as a wave barrieron the ground vibrationunder excitation of amechanicalvibrator(with an electric motor) in small scale laboratory tests. Laboratory methods are utilized for investigating the influence of cell foam on vibrations in sand by conducting vertical vibration tests with different thickness of cell foam.It is concluded that cell foam used as a wave barriermaterialis significantly working forhighfrequency rangeand for low frequency range the effect is not so effective and obvious.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
35

Macaulay, Gavin John. „Wave envelope elements for acoustics“. Thesis, University of Canterbury. Mechanical Engineering, 1994. http://hdl.handle.net/10092/5574.

Der volle Inhalt der Quelle
Annotation:
This thesis develops and extends a method for modelling acoustical propagation in unbounded domains. This wave envelope method is ideally suited for inclusion into existing acoustic finite element formulations. Results are presented for test cases which show close agreement between the wave envelope results and analytical results. Basis function interpolation in the wave envelope elements can be varied from order 2 to order 10, allowing for modelling of complicated pressure fields solely with wave envelope elements. The system to be solved consists of three frequency independent matrices, allowing easy generation of frequency response data. For large systems a frequency response calculation can consume considerable CPU time and a modal decomposition procedure using Ritz vectors is presented that can significantly reduce computation times, with minimal loss in accuracy. The use of Ritz vectors was also found to give better results than the full solution from some situations.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
36

Saà-Seoane, Joel. „Simulation and design optimization for linear wave phenomena on metamaterials“. Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/65323.

Der volle Inhalt der Quelle
Annotation:
Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 87-91).
Periodicity can change materials properties in a very unintuitive way. Many wave propagation phenomena, such as waveguides, light bending structures or frequency filters can be modeled through finite periodic structures designed using optimization techniques. Two different kind of problems can be found: those involving linear waves and those involving nonlinear waves. The former have been widely studied and analyzed within the last few years and many interesting results have been found: cloaking devices, superlensing, fiber optics The latter is a topic of high interest nowadays and a lot of work still needs to be done, since it is far more complicated and very little is known. Nonlinear wave phenomena include acoustic amplitude filters, sound bullets or elastic shock mitigation structures, among others. The wave equation can be solved accurately using the Hybridizable Discontinuous Galerkin Method both in time and in frequency domain. Furthermore, convex optimization techniques can be used to obtain the desired material properties. Thus, the path to follow is to implement a wave phenomena simulator in 1 and 2 dimensions and then formulate specific optimization problems that will lead to materials with some particular and special properties. Within the optimization problems that can be found, there are eigenvalue optimization problems as well as more general optimal control topology optimization problems. This thesis is focused on linear phenomena. An HDG simulation code has been developed and optimization problems for the design of some model devices have also been formulated. A series of numerical results are also included showing how effective and unintuitive such designs are.
by Joel Saà-Seoane.
S.M.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
37

Garner, Jason R. „Millimetre and sub-millimetre wave input couplers for gyrotron travelling wave amplifiers“. Thesis, University of Strathclyde, 2018. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=29375.

Der volle Inhalt der Quelle
Annotation:
The input coupler is an important component for a microwave amplifier. A sidewall single-hole input coupler for a W-band gyrotron travelling-wave amplifier that operates at the frequency range of 90–100 GHz was designed and measured. Instead of using a cutoff waveguide, a broadband Bragg-type reflector with a small spread in phase was optimized for use as part of the input coupler. The minimum radius of the reflector was two times the size of a cutoff waveguide, which reduced the possibility for some of the beam electrons being collected in this section and lost to the amplifier interaction region. The design, simulation, construction and measurement of a W-band waveguide input coupler that used a backstop Bragg reflector that allowed for high electron beam transmission from a cusp electron beam source into a 3-fold helically corrugated interaction waveguide (HCIW) of a gyrotron travelling wave amplifier is presented. Experimental results are reported of a broadband, high power, gyrotron traveling wave amplifier (gyro-TWA) operating in the 75-110 GHz frequency band. The second harmonic cyclotron mode of a 55 keV, 1.5 A, axis-encircling electron beam was used to resonantly interact with a traveling TE21-like eigenwave, achieving broadband amplification. The gyro-TWA demonstrated a 3 dB gain bandwidth of at least 5.5 GHz in the experimental measurement with 9 GHz predicted for a wideband drive source with a measured unsaturated output power of 3.4 kW and gain of 36-38 dB. The inclusion of the Bragg reflector in the W-band waveguide input coupler enabled efficient (4.4%) beam-wave interaction to be achieved within the gyro-TWA. The design of 1) a T-junction fundamental mode rectangular to- circular waveguide input coupler, 2) a multiple-hole input coupler and 3) a higher order mode (HOM) input coupler for a low-terahertz gyrotron travelling wave amplifier were studied. The T-junction input coupler with a Bragg reflector and a multiple-hole directional coupler were optimized for operation between 360 and 384 GHz, the proposed bandwidth of a low THz gyro TWA. The T-junction coupler and the multiple-hole coupler achieved the respective bandwidths of 10% and 35%.A higher order mode (HOM) two-branch waveguide coupler based on the even distribution of incident power was designed to couple the rectangular TE10 mode to the circular TE61 mode. The optimised tapered waveguide input coupler achieved an operating frequency range of 359–385 GHz, equating to a bandwidth of 7%. A prototype waveguide coupler scaled to W-band (75–110 GHz) was manufactured. The vector network analyser measured return loss of the HOM coupler was shown to be < 10 dB at 90–96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the HOM coupler.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
38

Magagna, Davide. „Oscillating water column wave pump : a wave energy converter for water delivery“. Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/349009/.

Der volle Inhalt der Quelle
Annotation:
The research presented in this dissertation investigates the development and the performances of a new type of Wave Energy Converter (WEC) aimed to provide water delivery and energy storage in the form of potential energy. The Oscillating Water Column Wave Pump (OWCP) concept was proposed and tested through a series of experimental investigations supported by scientific theory. The OWCP was developed after an extensive study of the existing wave energy technology available, from which it emerged that the Oscillating Water Column (OWC) device could be further implemented for water delivery purposes. The existing theory of the OWC was employed to develop a mathematical theory able to describe the system wave response and water removal of the OWCP. In order to understand and validate the mathematical models of the OWCP, experimental investigations were carried out under the influence of incident linear waves in a two-dimensional (2D) and three-dimensional (3D) wave flume. The experimental equipment and methodology are outlined, including the description of wave flumes, models and data acquisition equipment. Experimental tests were used to verify the concept of the OWCP and assess its performances, investigating both the response of the device to the waves with and without water removal. In order to increase the efficiencies of delivery, array configurations of multiple OWCPs were adopted. The research demonstrated that up to 14% of the energy carried by the incoming waves can be converted into useful potential energy for a single device. Moreover a further increase of the efficiencies can be obtained with the array configuration improving the overall capability of the OWCP, for optimal separation distance between the array components. Further model tests are required to extended this research to validate the developed mathematical models as an effective prediction tool of the performances of the OWCP and further increase the efficiency of water removal that can be achieved.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
39

Zuboraj, MD R. „Coupled Transmission Line Based Slow Wave Structures for Traveling Wave Tubes Applications“. The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1477947681829031.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
40

Ikeda, Tatsunori. „Improvement of surface wave methods for constructing subsurface S-wave velocity structures“. 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188570.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
41

Duncan, Karen Ann. „Women's reservation wage for home-based work and its implications for their labour supply /“. The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487844948076174.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
42

Viegas, Colin. „Broadband Schottky diode components for millimeter-wave instrumentation“. Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/broadband-schottky-diode-components-for-millimeterwave-instrumentation(93ced9dc-f866-418f-a525-742008b89b88).html.

Der volle Inhalt der Quelle
Annotation:
Terahertz source technology has been an active area of research for a number of years. This has helped develop continuous wave solid-state sources that are highly desirable in a wide range of applications spanning from Earth science to medical science. However, even with advances in terahertz technology, the generation of fundamental source power at these frequencies is still challenging. Promising electronic solid-state devices fall short in overcoming source power shortage due to electronic breakdown mechanism and fabrication limits at terahertz frequencies. The fundamental physical limitation of photonic devices, such as low photon energy, force cryogenic operation which at times is impractical. Schottky diode frequency multipliers often offer a very practical solution for generating continuous wave radiation based on solid-state technology. This harmonic source technology is today a most certain candidate for many applications where compactness and room temperature operation is desired. However, despite of all the advances in Schottky diode fabrication and their use in frequency multiplication, output power falls rapidly with increasing frequency. Thermal constrains, fabrication limits, assembly errors and parasitic losses all constitute changes that affect the performance of these devices and make it difficult to reproduce experimental data. To overcome these problems and progress towards the generation of milliwatts of power at terahertz frequencies, the study of existing methods to generate and handle high power is necessary. In the first part of the thesis, the design, fabrication and development of two Schottky diode-based frequency doublers is discussed. The work focuses on the generation of high-power sources that are capable of handling higher input powers while maintaining good thermal efficiencies. A detailed study into the machining tolerances, assembly errors and temperature effects are evaluated for the frequency doublers. High frequency effect such as velocity saturation is also addressed. Depending on the design frequency and power handling, two different circuit configurations are employed for the frequency doublers. While the high-power 80/160 GHz frequency doubler used a discrete flip-chip diode configuration, the 160/320 GHz frequency doubler employed an integrated diode membrane to mitigate sensitivity issues encountered during assembly and enable correlation between simulated and measured data. The second part proposes the use of millimeter-wave Schottky diode-based radiometers for imaging of composites samples. The focus of this experiment is the introduction of an alternate EM inspection method with the use of broadband Schottky diode components. This technique combines two different fields {--} non-destructive testing and radiometry, which presents a potentially new and interesting area for research. Since no single method can qualify to be the most accurate for all inspections, and with the future integration bringing down manufacturing costs of high frequency components, this demonstration presents a new approach to consider for future material imaging and evaluation experiments.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
43

Dods, Steven R. A. „A spectral theory for planar dielectric waveguides“. Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30690.

Der volle Inhalt der Quelle
Annotation:
The problem of electromagnetic wave propagation across the junction of two similar planar dielectric waveguides is analysed, within the Kirchhoff approximation, by expanding the field into transverse variations of all possible modes. It is proven that the expansion can represent any solution for any planar dielectric waveguide. The spectral function is introduced into the representation, and this helps resolve some of the theoretical problems in passing from the limit of closed waveguides to open waveguides. Using the spectral function and the Gel'fand-Levitan integral equation some new exact solutions to novel dielectric planar waveguides can be found. Examples of waveguiding by total internal reflection or by Bragg reflection (which are physically very different processes) can be generated by changing a single parameter in the formulation. Usually the representation for an open dielectric waveguide requires the matrix spectral function. However the Gel'fand-Levitan reconstruction is defined for scalar spectral functions. A technique for constructing the spectral matrix and the scattering solutions from two spectral functions is demonstrated. This technique uses a variational formulation of a scattering experiment. The connection between a dielectric structure and the characteristics of propagation on it is obscure. However the connection between these characteristics and the spectral function is much clearer. It is sometimes possible to make predictions about the properties of the waveguide by looking at its spectral function only. Since the connection between the spectral function and the dielectric structure is well established by inverse spectral theory, introducing the spectral function has been of help in establishing the desired connection between the dielectric structure and the characteristics of propagation on it. Such considerations suggest one of the above waveguides is sensitive to small perturbations and could be used as an electro-optic modulator. Detailed calculations confirm the hypothesis.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
APA, Harvard, Vancouver, ISO und andere Zitierweisen
44

Barnard, G. A. „Inter-industry wage differentials and the role of workers' concern for equity“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/NQ44357.pdf.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
45

Koutmeridis, Theodore. „The market for 'rough diamonds' : information, finance and wage inequality in macroeconomics“. Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/58068/.

Der volle Inhalt der Quelle
Annotation:
During the past four decades both between and within group wage inequality increased significantly in the US. Three of the most well-documented facts concern the increase in the education premium, the rise in the experience premium and the narrowing gender wage gap. Existing studies explain some of them separately but there is no unified explanation of all three at the same time. I provide a microfounded justification for the first two, by introducing private employer learning in a signaling model with credit constraints. I show that when financial constraints relax, talented individuals can acquire education and leave the uneducated pool. This implies that the eventual group of uneducated young workers becomes of lower average quality, as most of the rough diamonds have now been plucked out of this group. My explanation is consistent with US data from 1970's to 2000's, indicating that the rise in the education and the experience premium coincides with a fall in unskilled inexperienced wages, while at the same time skilled or experienced wages do not change much. The model accounts also for the fact that the education premium increases more for low-experienced workers, while the experience premium increases only for the low-educated ones. The introduction of gender-specific credit constraints, explains also the narrowing gender wage gap, by allowing the cost of borrowing to decline and become more similar for the two genders recently, while in the past it was much costlier for women. More equal borrowing opportunities for men and women, decrease inequality between genders, however they also increase inequality within gender by boosting the wage gap between different education and experience groups for both sexes. This theory explains the puzzling coexistence of increasing meritocracy and growing wage inequality in the American society, by highlighting the conflict between equal opportunities and substantial economic equality.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
46

ZHAO, Ling. „Wage Discrimination and the Hukou System in China: Survey-based Analyses for Manufacturing Workers in Pearl River Delta“. 名古屋大学大学院国際開発研究科, 2012. http://hdl.handle.net/2237/16251.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
47

Park, Si-hwan. „Methods for the numerical analysis of wave motion in unbounded media /“. Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004353.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
48

Tan, Loh Teng Young. „Assessments of wave-structure interactions for an oscillating wave surge converter using CFD“. Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/12230.

Der volle Inhalt der Quelle
Annotation:
This thesis is concerned with the use of the open source computational fluid dynamics (CFD) software package, OpenFOAM® for predicting and analysing the behaviour of a near-shore oscillating wave surge converter (OWSC), when subject to various types of ocean wave conditions in a numerical wave tank (NWT). OpenFOAM® which utilises a Finite Volume Method (FVM) is used to solve the incompressible, Reynolds Averaged Navier-Stokes (RANS) equations for a two-phase fluid, based on a Volume of Fluid (VOF) phase-fraction approach to capture the interface between the air and water phases. Preliminary studies on classic wave-structure interaction benchmark cases, involving a fixed and a vertically oscillating semi-immersed horizontal cylinder are carried out. The gradual transition of the linear to non-linear behaviour of the horizontal and vertical forces induced on a fixed cylinder when subject to various regular waves, and the amplitude ratios of the surface waves elevations generated by the prescribed oscillatory motion of the cylinder, are shown to provide good overall agreement within the limitations of the relevant theory and the experimental data in the literature. The OWSC is modelled with the inclusion of a Power Take-Off (PTO) system, using a linear damping restraint, and simulated in two-dimensional (2D) and three-dimensional (3D) setups. The 2D and 3D numerical results, such as the surface wave elevations, flap angular velocity, PTO torque and flap angular displacement, compare well with one another and with the experimental data for operational regular head-on and oblique wave conditions. Small discrepancies between numerical results and experimental data are likely to be caused by non-linear behaviour of the PTO system. Pressure distributions on the flap surfaces and forces induced on the flap and hinge of the OWSC for various wave conditions are also presented. The effects between 2D and 3D wave-structure interactions become more significant when subject to large waves that break during impact. Comparison between the full scale and 1:24 scale numerical results of the OWSC shows no significant evidence of viscous and scaling effects. The validated 2D OWSC model is also subject to embedded focused waves, to predict the worse possible scenario of wave loading in extreme wave conditions. The delay of the focus event breaking is shown to affect the slamming behaviour for the larger focus event wave heights. Incorporation of a focused wave at different phase positions within a background of regular waves reveals that the focus event wave height has little effect on the peak tangential force on the flap during the slamming event, when a PTO cut-off mechanism is implemented to prevent excessive torque surges. In contrast, the peak radial force on the flap and the maximum resultant force on the hinge appear to respond more sensitively to the focus event wave height. It has been demonstrated that OpenFOAM® is able to provide a comprehensive understanding of the complex hydrodynamic analysis and prediction of highly non-linear wave-structure interactions for an OWSC, which give useful guidance and confidence to WEC developers on the design considerations relevant to the OWSC systems.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
49

Heindrichs, Axel Stefan Dirk. „New methodologies in solid state NMR“. Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342111.

Der volle Inhalt der Quelle
APA, Harvard, Vancouver, ISO und andere Zitierweisen
50

Wilson, Jennifer L. (Jennifer Lyn). „Organizational Perceptions of Women's Vulnerability to Violence in the Wake of Disaster“. Thesis, University of North Texas, 1995. https://digital.library.unt.edu/ark:/67531/metadc277959/.

Der volle Inhalt der Quelle
Annotation:
Women as a group hold little power in the social system which increases women's vulnerability to domestic violence. According to Merton (1970), social problems may be revealed through the disaster recovery process. A coraHunity1s organizational response to social problems such as wife abuse depends upon organizational members' perceptions. The data suggest that organizational perceptions of domestic violence largely depend upon the setting or environment in which an organization exists and operates. A second factor that greatly determines an organization's perception of domestic violence after disaster is organizational type. Organizations which provide services to domestic violence victims pre-disaster are more likely to perceive domestic violence following disaster than organizations which do not provide domestic violence related services prior to disaster.
APA, Harvard, Vancouver, ISO und andere Zitierweisen
Wir bieten Rabatte auf alle Premium-Pläne für Autoren, deren Werke in thematische Literatursammlungen aufgenommen wurden. Kontaktieren Sie uns, um einen einzigartigen Promo-Code zu erhalten!

Zur Bibliographie