Organizational ambidexterity is a widely researched and known phenomenon amongst academics; however there are still research gaps. Most of the studies are in private sector; however, lately researchers have called for more studies in the public sector. The purpose of this dissertation is to explain casual relationships between different leadership styles and their influence on organizational ambidexterity in public sector organization. The dissertation use a positivistic philosophy and a deductive approach; hence, a cross sectional design is used. The quantitative method chosen was a web based survey, distributed by e-mail to 171 managers operating in waste management and water and sewerage industries in the Swedish public sector. The findings of the study are that are that it is not possible to differentiate a higher level of organizational ambidexterity in any public organizational form. Another finding is that organizational ambidexterity can be positively influenced by managerial leadership in the local government administration The limitations of this dissertation are that only two industries are included and that the results cannot be generalized for other populations due to a small sample. The implications of this study are that organizational ambidexterity is a concept that is present in the public sector and can be influenced by managerial leadership under certain circumstances

There exist large number of techniques for the preparation of nanostructured materials. Among them the preparation of nanopowders by gas/vapour condensation is a popular one. Because of very high level of surface to volume ratio, powders of metals which may or may not be reactive in the bulk form undergo vigorous oxidation. Oxidation once initiated continues in an auto catalytic fashion leading to a rise in temperature further increasing the oxidation rate. Therefore, the nanopowders are consolidated in situ under high vacuum. Alternatively a thin passivating oxide layer of few nm can be produced by slow exposure to air. Such powders lend themselves to be handled in further processing in ambient atmosphere. The main objective of the present research is to understand the various scientific and technological issues involved in preparing such passivated nanopowders by levitational gas condensation (LGC) technique, a relatively less explored vapour condensation process and their subsequent consolidation by the powder metallurgical route of compaction and sintering. The nanopowders systems studied are Fe and Fe-Cu (4 wt. %Cu). In chapter 1 a brief review of the gas condensation process and the consolidation behavior of nanopowders produced by this method were carried out. Existing knowledge on various topics relevant for the present study like formation of nanoparticles, agglomeration during gas condensation, physical, structural and chemical nature of the passive layer formed during passivation, compaction and sintering behaviour of this passivated nanopowders were discussed. Chapter 2 details the synthesis of Fe nanopowders by levitational gas condensation process and its physical and structural characteristics. The nanopowders in the as synthesized condition showed extremely low packing density due to loosely packed weakly interlocked agglomerates. The nanoparticles manifest as three dimensional reticulated spongy structure composed of chains of these nanoparticles. Heat transfer calculation carried out to determine the particle temperature at different distance from the levitating drop indicates that the nanoparticles can be ferromagnetic at a distance of less than 2 mm away from the levitation drop and hence the magnetic nature of the materials plays an important role in the formation of nanoparticle chains and spongy agglomerates. Passivation of the nanopowders by slow exposure to air produces 3-4 nm thick oxide layer (Fe3O4) over α-Fe and the volume of these oxides was around 45%. The 3rd chapter presents and discusses the results of Fe-Cu alloy nanopowder synthesized by levitating gas condensation process. While synthesis of elemental nanopowders by gas condensation is straight forward as the operating conditions only influence the particle size, alloys require careful control of the levitating drop composition. Although initially we start the process with levitated drop of required composition, the vapour generated will be richer in more volatile element (Cu in our case). Thus the composition of the levitated drop progressively becomes deficient in Cu which in turn reduces Cu in the vapour. Composition of the drop can be stabilised by continuous feeding of the alloy of required composition that can be estimated from the knowledge of equilibrium relation. To establish the equilibrium relationship between composition of the liquid and vapour in evaporation and condensation, phase diagram in the liquid and vapour region was calculated and was validated by determining composition of the drops. Good agreement between the drop composition and the composition predicted by the phase diagram were observed. Various physical, chemical and structural properties of the Fe-Cu nanopowders are characterized in detail using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and thermogravimetry (TG) analysis. The overall chemical composition of the Fe-Cu alloy nanopowders and of the individual agglomerates is same as the composition of feed materials used. However, Cu was found to segregate to the surface of the nanopowders which is attributed to minimization of surface energy with Cu at the surface. The total weight loss observed in TG in flowing hydrogen indicates that the surface passive layer of Fe-Cu appears to be very thin compared to Fe. The consolidation behaviour of both Fe and Fe-Cu nanopowders was studied by both conventional and spark plasma sintering (SPS) and are discussed in chapter 4. The as collected nanopowders from the apparatus have extremely low apparent density. The powders were further subjected to soft milling in a ball mill under ethanol to disentangle the agglomerates there by improving the pack density. A tenfold improvement was achieved thus making it suitable for consolidation. Uniaxial compaction of these powders for conventional sintering at pressure below 200 MPa yielded compacts free from defects. However, at higher pressure the compacts cracks and delaminates during ejection stage. Analysis of the compaction curves helped us to understand various processes involved during compaction as well as providing explanation for lower green density of Fe-Cu powder compared to Fe. Conventional sintering of the nanopowders compacts were carried out in the flowing hydrogen atmosphere in a laboratory vacuum furnace over wide range of temperatures. Instrumented sintering experiments were also carried out in a dilatometer under hydrogen atmosphere to evaluate shrinkage rate at different temperatures. SPS were carried out under 10 Pa vacuum at a compaction pressure of 250 MPa in WC-Co die cavity. The stability, density and residual oxygen content of the sintered compacts were quantified. Detailed microstuctural analysis of the sintered samples were also carried out using optical microscopy, atomic force microscopy, scanning electron microscopy, transmission electron microscopy, scanning transmission electron microscopy and quantitative composition analysis by EDS. Conventionally sintered compacts of both the powders showed stability only when sintered at 700°C and beyond. The maximum shrinkage/densification occured around 450°C for both the powders and the densification rate observed in Fe-Cu is three times higher than Fe. This enhanced densification in Fe-Cu is attributed to an enhanced diffusivity of Fe atoms in the transient liquid Cu layer formed at the interfaces. The microstructure of Fe-Cu is completely free from any separate oxide phase unlike in samples of Fe sintered at 700°C that contain ultrafine oxide grains. This was explained on the basis of role played by acrawax, a lubricant, admixed to increase the green density. Based on the sintered densities of both SPS and conventional sintered compacts, residual oxide content of the compacts sintered at different temperature and experimentally observed shrinkage rate a phenomenological model has been proposed for the possible sequence of processes occurring during sintering of these nanopowders. The major findings of this work are summarized in chapter 6 and chapter 7 details the scope for the future work.

Background of the Study The aims of this study was to specifically investigate the differences in culture, attitude towards life and social networks between Australian and Taiwanese men and women in addition to determining the factors that predict midlife men and women's quality of life in both countries. Because individualism and collectivism are the two most thoroughly researched constructs in inter-cultural and cross-cultural studies we should look at how these construct affects societies. The theme for individualist cultures (such as Western cultures) is autonomy, while the theme for collectivist cultures (such as Asian cultures) is connection. Most literature available on individualism and collectivism note all cultures have different values that influence their society and ultimately a person's individual health outcome. Very little work has been undertaken in this domain in Australia or Taiwan, particularly in the area of midlife transition and from a cultural perspective. Methodology Data was collected from a cross-sectional, supervised self-administered survey using census data and a probability proportional sampling (PPS) strategy on a general population of men and women aged 40-59 years old who live permanently in Brisbane, Australia and Taipei, Taiwan. The study population was divided into 163 Statistical Local Areas (SLAs) in Brisbane, and 449 Local Government Communities (LGCs) in Taipei. Sixty clusters were randomly selected using probability proportional sampling (PPS) to obtain 30 Australian clusters and 30 Taiwanese clusters. In this study, the 30 (areas) by 7(people) method was used with an additional strategy. The variables were measured including: culture (vertical and horizontal individualism and collectivism), attitude towards life (the total score of optimism), social networks (the total score of emotional, informational, affectionate, tangible, and positive social interaction) and quality of life (physical, psychological, social, and environmental health), social demographical factors and religion and spiritualty. The data analysis procedure included descriptive, bivarite and multivariate multiple regressions and classifications and regression trees (CART). A comparison of the linear regression and regression tree results were discussed. All data analysis was performed by SPSS and S-Plus softwares. Results The overall response rate for the study was 84.2% for midlife Australian men and women and 88.4% for midlife Taiwanese men and women this resulted in 278 Australians (45.3% men) and 398 Taiwanese (35.4% men) providing data to be analysed. Findings in this study indicated country of residence has an overwhelming impact on quality of life with significant differences seen between midlife Australian and Taiwanese men and women (F4, 666= 59.31, P< .001). Results suggest midlife Australian men and women have a better quality of life than midlife Taiwanese men and women. In addition, a comparison of the linear regression and regression tree results reveals that two models identified the same major affect variable for different countries of residence: which was attitude towards life in midlife Australians and social networks in midlife Taiwanese. However, regression trees were able to capture important nonlinear effects as well as interactions between cultural attribute variables. This study demonstrated culture significantly involves multiple functions and interacts with attitude towards life, social networks and individual factors to influence a person's quality of life. The interaction of cultural circumstances and the internal and external factors involved, show less comparative attributes and increased equality attributes, defining the need for people to have a good social networks and a healthy positive disposition. Conclusion Because of the ever increasing flexibility of world travel and a global population, people have much more opportunity to interact with many other cultures which would create improvement in learning opportunities and better health management effectiveness for people the world over. This study has addressed and contributed to the assessment of multi-cultural quality of life research and has important implications for all health professions in addition to government departments and organisational policy makers of both countries. And finally, this study has identified that there needs to be a concerted effort to implement major policy shifts in the near future because of the changing fabric of modern societies. At the same time technology and globalisation have advanced rapidly and point to new opportunities within and across countries for more diverse approaches in research and the implementation of policy initiatives to occur. This study has highlighted that opportunities exist to reflect on current policies for Australian and Taiwanese societies to provide enhanced opportunities to care for the growing midlife populations.