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Characteristics of semiconductor optical waveguides fabricated by impurity-induced layer disordering
No full textImpurity induced layer disorder-delineated buried channel optical waveguide non-rectilinear routing structures are found to have loss properties equal to or better than other planar optical waveguides. With 3 dB loss angles of 3\sp\circ, for simple abrupt bends, and 7\sp\circ, for modified abrupt bends, and 3 dB transition lengths of 300 m for S bends with a 100 m offset, these waveguides are capable of handling the routing requirements for many opto-electronic integrated circuit applications. A previously uncharacterized electro-absorption effect in a single quantum well graded barrier laser heterostructure was investigated as a means of providing electro-optic modulation and detection. This electroabsorption effect produced a change of over 100 cm\sp{-1} in the modal absorption coefficient with less than a volt change in bias. Based on these findings, the feasibility of using a single heterostructure for the integration of multiple optical devices is addressed.Made available in DSpace on 2011-05-07T12:17:34Z (GMT). No. of bitstreams: 2
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
9011044.pdf: 3436638 bytes, checksum: 8ad6616f17be517e156e1dbcebaf4aed (MD5)
Previous issue date: 1989Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:39:13Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:16:28-05:00
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Reason: ETDs are only available to UIUC Users without author permissionETDs are only available to UIUC Users without author permissionU of I Onl
Measuring the labor supply effect of income taxation using a life-cycle labor supply model: A case of Indonesia
No full textThe focus of this study is to estimate a life cycle model of labor supply including taxes for a developing economy by applying two methods of estimation. The first method is the cohort approach and the second approach is the consumption approach. The idea of the cohort approach is to create a simulated representative individual's life path by stratifying the sample according to the age of the head of household. The consumption approach, on the other hand, eliminates all future variables in the labor supply equation by proxying the marginal value of wealth ( with consumption.The two approaches enable me to use cross section data to estimate a life cycle model. Estimating a life cycle model using cross-section data avoids the attrition problem encountered in panel data. Both approaches also introduce techniques to handle the measurement error problem; i.e., the moving average in the cohort approach and the instrumental variables in the consumption approach. The consumption approach, however, is better than the cohort approach because it avoids cohort bias and it enables us to correct selection bias using Heckman (1979) technique. This adjustment is very important especially in the estimation of female labor supply.The results show that the compensated intertemporal elasticities of labor supply with respect to the wage rate tend to be larger than those found for developed economies. However, as in developed economies, Indonesian women are more tax sensitive than men. It is also shown that for males, the higher the education level and family income, the less sensitive the labor supply with respect to the wage rate. For females, however, the higher the education level, the more elastic labor supply with respect to the wage rate. Children have a positive and significant effect on female labor supply, indicating that they represent a financial burden in the family, which induces wives to work outside the home to get additional income. Extended family members have a negative effect on female labor supply, but a positive effect on male labor supply. (Abstract shortened by UMI.)Made available in DSpace on 2011-05-07T12:39:10Z (GMT). No. of bitstreams: 2
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
9305563.pdf: 5037017 bytes, checksum: fa7f8dee78592672ba7e849ea6745dd4 (MD5)
Previous issue date: 1992Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:43:53Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:19:15-05:00
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The effect of four approaches to score study on student conductors' ability to detect errors in the performance of choral music
No full textThe purpose of the study was to determine the relative effectiveness of four approaches to score study on undergraduate music students' ability to detect errors in choral performance, to examine the relationship of scores by pianists and non-pianists, and to examine the extent to which subjects found nonexistent errors in performances.Four groups of subjects, ordered by a counterbalanced design, used four approaches, using a piano, using a recording, sightsinging and silent inspection, to study four compositions on four days. Taped performances with deliberate pitch and rhythm errors served as stimuli. The subjects followed the scores, circled the errors they detected, and attempted to notate the errors.The subjects detected and notated more rhythm errors than pitch errors, and were more adept at error detection than error notation. Using a recording was found to be significantly more effective than using a piano, but no other significant differences emerged between other pairs of approaches.Pianists achieved higher scores than non-pianists, but the difference was not significant.All but one subject perceived the presence of nonexistent errors.Made available in DSpace on 2011-05-07T12:51:39Z (GMT). No. of bitstreams: 2
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
9210841.pdf: 3791708 bytes, checksum: ba40401666ecf30f1fe73ea79ae2f8c4 (MD5)
Previous issue date: 1991Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:46:50Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:21:05-05:00
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Self-consistent Monte Carlo simulations of plasma processing reactors
No full textWhen the fractional ionization of a plasma exceeds 10\sp{-5}- 10\sp{-4}, electron-electron (e-e) collisions become important. These collisions cause the electron energy distribution (EED) to approach a Maxwellian distribution. Electron cyclotron resonance (ECR) reactors for etching and deposition have a high plasma density and fall into the category of devices for which e-e collisions must be considered. In this thesis, a self-consistent Monte Carlo (MC) simulation for low-temperature partially ionized plasmas is presented. In this simulation, the effects of electron-electron collisions are taken into account. Electron-electron collisions are treated as being functionally equivalent to electron-neutral collisions. That is, instead of having an electron collide with an individual electron, the electrons collide with an energy-resolved electron fluid. The modified null-cross-sectional technique is employed, making the MC simulation computationally tractable. The model is used to study ECR reactors and is a hybrid MC fluid model. The MC simulation generates details of the EED and the fluid model generates the ambipolar fields. The MC and fluid models are iterated to obtain a converged solution. The model has been utilized to investigate electron swarm parameters in ECR reactors for Ar and N\sb2 plasmas at different pressures and different input microwave powers. The parameters investigated are the EED, electron impact rate coefficients, average electron energy, plasma potential, and power deposition. The results are in general agreement with experiment.Made available in DSpace on 2011-05-07T13:42:34Z (GMT). No. of bitstreams: 2
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
9211028.pdf: 2927591 bytes, checksum: 34d0821c04926d6c626748f4fe8d002c (MD5)
Previous issue date: 1991Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T14:58:12Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:27:21-05:00
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Reason: ETDs are only available to UIUC Users without author permissionETDs are only available to UIUC Users without author permissionU of I Onl
The choral music of Lou Harrison. (Volumes I and II)
No full textLou Harrison's music is clearly an important contribution to the twentieth century repertoire. His early writing for percussion ensemble, experiments in just intonation, melding of Eastern and Western influences, instrument building, and music for gamelan are especially significant. While much of his work has received attention, performance, and praise, his music for chorus is not well-known, much of it in manuscript and inaccessible.This study examines in detail the complete choral works of Harrison from 1939 to the present. It is the purpose of the study to define his compositional style through an analysis of these works. The text is divided into three main sections, the first of which is a brief biography and chronology of the choral works. The main body of the document is an analysis of the works, discussed in chronological order. Each piece is addressed individually with regard to the stylistic characteristics of melody, rhythm, harmony, texture, form, and text setting, where applicable. The final portion is a summary of Harrison's compositional style for chorus and concluding remarks. Appendices include a chronological listing of the works, and transcriptions of conversations between the author and Lou Harrison and Ben Johnston and Harrison. The second volume contains reproductions of the unpublished choral scores.Harrison's background has furnished a rich and fertile soil for the development of his choral style. His early study with Henry Cowell and Arnold Schoenberg, associations with John Cage and Harry Partch, and abiding affinity to Eastern cultural, philosophical, and musical influences, coupled with an adherence to the principles of just intonation and interest in the world's music, has produced a willful experimentation with and assimilation of various styles within his own. All of these influences are clearly evident in the choral works, music which is expressive, fresh, imaginative, and interesting, an amalgam of his many loves and interests.Made available in DSpace on 2011-05-07T13:59:15Z (GMT). No. of bitstreams: 2
license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5)
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Previous issue date: 1989Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding ([email protected]) on 2011-05-07T15:01:37Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:29:14-05:00
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Reason: ETDs are only available to UIUC Users without author permissionETDs are only available to UIUC Users without author permissionU of I Onl
Elementary excitations in heavy-fermion superconductors
No full textA theoretical study is presented of the elementary excitations in heavy-fermion superconductors, under the hypothesis that the Cooper pairs are in a relative p-wave or d-wave. First, all p-wave and d-wave states are classified in the presence of strong spin-orbit coupling and crystal fields, which are important effects in heavy-fermions. It is found that p-wave states generally have either a gap on the entire Fermi surface or a gap with point nodes, as in the axial state, while d-wave states generally have a gap with lines of nodes, as in the polar state. Secondly, the specific heat, ultrasonic attenuation and thermal conductivity that result from the qausiparticle excitations out of such states are calculated. The gapless states of the axial and polar type produce low temperature power laws for these quantities that reflect the density of low-lying qausiparticle excitations. These results are then compared to the experimentally observed power laws in heavy-fermion superconductors. Finally, we study hydrodynamic collective modes associated with the rotational degrees of freedom of the p-wave or d-wave order parameter, called spin-orbit modes. These modes result in anomalous electron paramagnetic resonance and neutron scattering. In addition, they couple to sound propagation and produce anomalous absorption peaks. It is suggested that such a loss mechanism accounts for the sound attenuation peak observed in superconducting UBe13.Submitted by Carolyn Mead ([email protected]) on 2011-05-16T19:09:42Z
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1987_rodriguez.pdf: 4143258 bytes, checksum: 043e940d02aaded547edd7186ce6ebda (MD5)Made available in DSpace on 2011-05-16T19:09:42Z (GMT). No. of bitstreams: 1
1987_rodriguez.pdf: 4143258 bytes, checksum: 043e940d02aaded547edd7186ce6ebda (MD5)
Previous issue date: 1987Restriction data tranferred 2014-07-01T11:13:42-05:00
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Reason: ThesisItem marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead ([email protected]) on 2011-05-16T19:09:42Z
Item is restricted indefinitely.ThesisU of I Onl
Polaron transport in ionic crystals
No full textA new technique was developed for making measurements on highly
insulating photoconductors. This technique features ease of data
reduction, relative freedom from space charge polarization, and higher
sensitivity and stability than that of previous designs. Using the new
method, measurements were made of Hall effect, hot electron effects and
magnetoconductivity in a variety of ionic crystals. The conduction bands
of seven alkali halides were found to be isotropic with a measuring
accuracy of ± 0.5%.
Cyclotron resonance of photocarriers was observed at 139 GHz by
electron heating effects. Polaron effective masses were measured in a
variety of materials and the results compared with previous experiments
and theory. In addition, transport effects due to spin polarization were
qualitatively identified in colored potassium halides. These effects
have been attributed to spin polarization of the F centers along with the
conduction electrons. They have been analyzed using a simplified model.
Preliminary measurements of spectral response of photoconductivity
in AgBr have been made and the results compared with optical absorption.
Structure has been found which may be related to the presence of minute
traces of impurity such as iodine.Submitted by Carolyn Mead ([email protected]) on 2011-07-11T14:09:27Z
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1968_borders.pdf: 2360575 bytes, checksum: cef820a497f4f7a9c0eefc276183068c (MD5)Made available in DSpace on 2011-07-11T14:09:27Z (GMT). No. of bitstreams: 1
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Previous issue date: 1968Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead ([email protected]) on 2011-07-11T14:09:27Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:32:53-05:00
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Education in America
No full textThis projected is based on interview of CY students who came to the United States alone for the better education. The author is mainly focusing different education system between Korea and United States. The main questions are: What is major difference between Korea and U.S. education system? why is English so important to learn? Why do you pick U.S. for your education place? What do you like about U.S. education system? How did studying in the U.S. have changed your life (education).Submitted by Tim McDonough ([email protected]) on 2008-06-04T19:57:08Z
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ResearchProcess.doc: 110592 bytes, checksum: 8041cfac347c0ce732347e17ff7a360e (MD5)Made available in DSpace on 2008-06-04T19:57:08Z (GMT). No. of bitstreams: 1
ResearchProcess.doc: 110592 bytes, checksum: 8041cfac347c0ce732347e17ff7a360e (MD5)
Previous issue date: 2008Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Tim McDonough ([email protected]) on 2008-06-04T19:57:09Z
Item is restricted indefinitely.Restriction data tranferred 2014-07-01T11:09:13-05:00
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Reason: Student research containing sensitive interview materials.Student research containing sensitive interview materials.unpublishedU of I Onl
Native Speakers' Reactions to Non -Native Stress in English Discourse
No full textWhile some differences among experimental groups were more robust than others, the consistent patterns in these results provide some evidence supporting the general hypothesis that native speakers process, understand, and respond more positively to non-native English speech when primary stress is used correctly compared to when it is not. Practical implications include suggestions for incorporating the teaching of English prosody as a component of communicative competence for international teaching assistants and other non-native speakers.Made available in DSpace on 2015-09-25T19:56:32Z (GMT). No. of bitstreams: 2
license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5)
9944870.pdf: 9557974 bytes, checksum: 5be13c952f5a468231c23595081350a0 (MD5)
Previous issue date: 1999Embargo set by: Seth Robbins for item 81606
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only195 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999
The FDI and the Regional Development in Chile
No full textThis is a comprehensive study of regional Foreign Direct Investment in Chile and its relationship with the development of Chilean regions. Following a process of steady foreign capitals flows to Chile, the link of this phenomenon with the growth of Chilean Regions are explored in three main chapters. The first part explores the main determinants in attracting FDI using a set of variables in a panel data econometric regression, finding that the most commonly used variables are determinants in attracting FDI in Chile depending on the type of investment and the sector in which this investment takes place, the investment in primary sectors in Chile are highly localized in regions characterized by having large quantities of natural resources and the significant variables are macroeconomic variables such as growth of GDP, unemployment rate, level of exports and public expenditure, whereas the investment in the services sector is concentrated in metropolitan regions where there were not significant variables from the set studied, only public investment and public expenditure (these variables were separated because they are channeled differently from the government). The second part will also use an econometric technique (panel data regression) to survey the bi-directional causality between FDI and GDP at regional level in Chile, the Granger tests performed in this chapter have an inconclusive outcome in determining bi-directional causality or uni-directional causality and its direction, but it can be inferred that it was the lack of enough time series to test further lags of causality. The third part will take a different approach on this relationship looking for the direct effect of FDI and domestic investment in the community, where large multinational firms are located in conjunction with a state-owned company in the same sector for a specific region of Chile, using an exploratory analysis, secondary data and the Corporate Social Responsibility (CSR) framework, the results showed that first, the direct contributions of these companies must have to be known in order to increase the positive perceptions of the community about the company, second, the community will respond positively towards these firms when they show interest in development of the region, third, there is a mutual benefit for the company, (state or foreign owned) and the community as a result of these contributions and fourth, for policy makers, it is important to encourage the responses from local companies, foreign companies and the community, that are product of policies towards CSR, because this can lead towards growth in the region and a source of profitability for multinationals and also the domestic firms.Made available in DSpace on 2015-09-25T18:22:57Z (GMT). No. of bitstreams: 2
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Previous issue date: 2010Embargo set by: Seth Robbins for item 80843
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only160 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010