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Electrodialysis is a membrane separation process that uses an electrical potential to drive the separation. The performance of these systems is largely based on the performance of their ion exchange membranes (IEMs). This research focused on enhancing the performance of IEMs for electrodialysis through surface modification techniques involving chitosan bonded to the surface of commercially available cation exchange membranes (CEMs). The surface functionalization techniques resulted in membranes with improved electrodialysis performance. This research also explored the processing framework to produce functionalized sulfonated PEEK (sPEEK) nanofibers for future consideration as cation exchange membranes. Chitin was deacetylated to form the functionalized biopolymer chitosan, then applied to the surface of CEMs, rendering them more hydrophilic. These membranes were evaluated across several electrodialysis performance metrics. Results demonstrate that adjusting the degree of deacetylation of chitosan to enhance membrane hydrophilicity positively impacted electrodialysis performance. Furthermore, this research evaluated the effectiveness of similarly functionalized membranes to extract Lithium from brine solutions. The chitosan-coated membranes showed improved electrodialysis performance, including enhanced flux, limiting current density, system resistance, selectivity, and fouling resistance. Lastly, the sPEEK nanofibers were produced for the fabrication of ion exchange membranes by manipulating operational parameters to assess their impact. This research presents the successful functionalization of PEEK via sulfonation and electrospinning of the resulting sPEEK. These nanofibers were then pressed to form a solid sPEEK membrane. It was observed that changes in electrical potential and rotational speed influenced fiber diameter and spinnability. A correlation was established between membrane surface hydrophilicity and electrodialysis performance metrics in desalination and lithium extraction applications. This research advanced the understanding of structure-property relationships for CEMs. The research herein proposes techniques for industries such as desalination and lithium extraction that can meet growing demands for clean water and sustainable methods for producing high-value raw material streams.

Although the psychological contract has been a popular topic in managerial research for the past twenty years, recent critiques of the research in this area point to several shortcomings. These are believed to result primarily from the overwhelming use of field studies, survey questionnaires, and other correlational procedures in the study of this construct. One particular research question that has generated mixed results involves the effect that one's underlying contract (either transactional or relational) has on individuals' perceptions of contract breach and feelings of violation following an employer's breach. This study sought to gain insight into this question by using an experimental study design to assess the impact that exchange congruence — or the match between the nature of the underlying contract and the nature of the breach — has on employees' perceptions of breach and feelings of violation. An experimental design was used and data was collected from 421 subjects in six treatment groups and two control groups. The treatment groups examined the effects of withdrawal breach (without resource substitutions) and both congruent and incongruent resource substitutions in transactional and relational work contexts. Also, two control groups in which no psychological breach was induced were examined. The results of the experiment differ for the transactional and relational treatments. No significant differences in perceptions of breach or violation were found with regard to the type of breach induced among the transactional treatments. Among the relational treatments, subjects that received incongruent resource substitutions perceived significantly higher levels of breach and violation than those that received congruent substitutions. Also, among the relational treatments, levels of perceived breach were significantly higher for the incongruent substitute treatment than for the withdrawal breach treatment. Therefore, the results of this study indicate that breach perceptions and feelings of violation vary for employees depending not only on the type of contract they hold, but the type of breach that they experience. In addition, the study demonstrated that an experimental design is applicable to this literature and that it could advance our understanding of the psychological contract in ways that are not possible with cross-sectional field studies. / Ph. D.

There have been different degrees of exchange rate disequilibrium in the developing countries during recent transition or reform periods. The level of the exchange rate and its misalignment can have significant impacts on agricultural policy measures such as the Producer Support Estimates (PSEs). However, little efforts have been made to explicitly take into account the issue of exchange rate misalignment. In the conventional PSE studies the prevailing actual (nominal) exchange rates are usually used. There is general agreement that the use of actual exchange rates may introduce a bias in the PSE calculations, and that this bias can be substantial when the actual rates are significantly out of equilibrium, but there is much less agreement on the most appropriate alternative. This dissertation proposes a theoretical and an empirical model for estimating equilibrium exchange rates. Within the context of these models, the equilibrium exchange rates are argued to be determined by a group of real economic fundamentals. These fundamentals within this study include technological progress (Balassa-Samuelson effect), levels of government expenditure, world interest rate, net capital inflows, terms of trade, and openness of the economy. Base on various time series techniques and using data from India and China, sensible long-run relationships are identified between the real exchange rate and these economic fundamentals. The long-run co-integrating relationships are used to derive the equilibrium exchange rates and to gauge corresponding misalignments for the currencies in the two countries. The relevance and usefulness of the exchange rate equilibrium and disequilibrium in the calculation of the PSEs for India and China are then discussed. Results from the commodity-specific measures including the Market Price Support (MPS) and the PSE show that agricultural support levels are quite sensitive to alternative exchange rate assumptions. Specifically, exchange rate misalignments have either amplified or counteracted the direct effect on agriculture from sectoral-specific policies. With a few commodity exceptions such an indirect effect in both countries is relatively small in magnitude and dominated by the direct effect. This is also the case when the indirect effect rises substantially as a result of more misaligned exchange rates. Counterfactual MPS measure calculated assuming the exchange rate is in equilibrium with different exchange rate pass-through is also presented. It is shown that when no exchange rate pass-through to domestic prices occurs, the transfer of the indirect effect of exchange rate misalignment into the counterfactual MPS is full. But when there is exchange rate pass-through, even though partially, the transfer of indirect effect is significantly smaller. Results based on the commodity-specific PSE show that the exchange rate effect also depends on the relative importance of different PSE components. In addition to a positive impact on the direct effects measured by commodity-specific PSE compared to those measured by commodity-specific MPS, the increasing share of budgetary expenditures in India's agricultural support in recent years has resulted in more pronounced indirect effects. For China, the exchange rate effects are more similar between the PSE and the MPS measures at the commodity level because of the dominance of the MPS component relative to the budgetary payments in the PSEs. Moving from commodity-specific to aggregate measures, one can observe a similar pattern of agricultural support. However, the exchange rate effect measured by the total PSE appears to be more important: it becomes several times larger in magnitude than the direct effect in periods of severe exchange rate misalignment. The exchange rate effect when the PSE is "scaled up" from covered commodities to an estimate for the total agricultural sector is also demonstrated even though the assumption imposed by scaling-up may be unrealistic if price support is concentrated among those products included in the analysis. Since the commodity coverage in both countries tends to be incomplete and the scaling-up procedure leads to a total MPS component of greater magnitude, larger exchange rate effects are found in the scaled-up than the non-scaled-up version of the total PSEs. The impact of scaling-up on the indirect effect is proportional to the share of covered commodities in the total value of agricultural production. Again for the PSEs at both the commodity and aggregate levels, the counter factual measures indicate a full transfer of indirect effect of exchange rate when no exchange rate pass-through is assumed. A large portion of the indirect effect disappears when incomplete exchange rate pass-through is assumed resulting in a smaller transfer of the effect to the counter factual PSEs. / Ph. D.

Thesis: Ph. D., Massachusetts Institute of Technology, Department of Economics, 1980 / Bibliography : leaf 127. / by Kazuo Ueda. / Ph. D. / Ph. D. Massachusetts Institute of Technology, Department of Economics

This dissertation analyzes the efficiency of the Bombay Stock Exchange (BSE) and the relationship of stock return patterns on the BSE with those of the New York Stock Exchange (NYSE). The data includes daily closing values of the BSE and S&P 500 Indexes for the period 1979-1990 and bi-weekly closing prices on 27 of the most active stocks on the BSE for the period 1980-1990.

The capital maintenance doctrine presupposes that a company’s capital must not be returned to its shareholders. The doctrine was anchored on three rules, one of which was that a company cannot acquire its own shares as this amounted to a diversion of capital to the shareholders whose shares were acquired. This rule was partly rationalized as protecting the interests of shareholders. In South Africa the rule was embodied in s 85 of the Companies Act 61 of 1973. However, it was amended by s 9 of the subsequent Companies Amendment Act 37 of 1999 to provide that a company can acquire its own shares if certain substantive and procedural requirements were satisfied. Upon the enactment of Companies Act 71 of 2008, the requirements have not been substantially altered. They are partly geared towards protecting shareholders by ensuring that shareholders are treated equally and fairly. Moreover, the Johannesburg Securities Exchange Limited (hence the JSE Limited) was empowered by the Companies Act 61 of 1973 to promulgate requirements to be met when a company wishes to acquire its own shares. The Companies Act 71 of 2008 does not in express terms empower the JSE Limited to develop requirements to be met when a company wishes to acquire its own shares. However, the Act expressly requires that a listed company wishing to acquire its own shares must also comply with the requirements of the relevant exchange. Such requirements can therefore be deemed to subsist even amidst the new Act as an internal regulation of the JSE Limited. The said requirements are also partly aimed at protecting shareholders, largely by ensuring that adequate information is availed to shareholders to empower them to make informed decisions. / Private Law / (LL.M. (Company Law))

The Anthropological Papers of the University of Arizona is a peer-reviewed monograph series sponsored by the School of Anthropology. Established in 1959, the series publishes archaeological and ethnographic papers that use contemporary method and theory to investigate problems of anthropological importance in the southwestern United States, Mexico, and related areas.

published_or_final_version / Chemistry / Doctoral / Doctor of Philosophy