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This dissertation consists of three essays. In the first essay, we attempt to answer the following three questions about the new capital raised in IPOs: Why do some IPO companies raise a lot of new capital while some others don’t? Where do the IPO companies use the new capital they raise in IPOs? How does the use of new capital affect the operating performance of IPO companies? We find that companies with higher R&D spending, higher capital expenditure, lower working capital and more long term debt tend to raise more capital in IPOs. These firms also spend more on R&D and capital expenditure. The more new capital firms raise in IPOs, the lower sales growth rate they have. However, firms spending a higher proportion of new capital on R&D seem to have higher sales growth rate. In the second essay, we examine the relation between IPO valuation and offering size. Using a sample of 3,885 IPOs from the US, we find that IPO firms with larger offering size have lower valuation. Both primary share offering and secondary share offering are negatively related to IPO firm valuation. The valuation measures are positively related to the levels of capital expenditure and R&D before IPO, lending support to explanations based on Jensen (1986)’s free cash flow hypothesis. We also find evidence consistent with negative signals from larger secondary share offering size. Results of tests about long run IPO stock performance do not support the hypothesis that IPO stock demand curve is downward sloping. In the third essay, we examine how analysts react to IPO offering size. We find that analysts predict lower long-term growth rates for IPOs with larger offering size. The sizes of both primary and secondary offering are negatively related to long-term growth rate forecasts. We find evidence that the free cash flow effect may be related to the negative relation between primary offering size and growth forecast.

The main objective of the thesis is to implement different architectures of 16-bit adders such as; Ripple CarryAdder (RCA), Manchester Carry Chain Adder (MCCA) and Kogge Stone Adder (KSA), in 65nm CMOS technology and to study their performance in terms of power, operating frequency and speed at near threshold operating regions. The performance of these adders are evaluated and compared with each other and a final conclusion is made as to which adder structure is more suitable for implementation in a 65nmtechnology for low power applications. Several optimisation techniques are performed for the adders to reduce the delay and power consumption. Propagation delay is the most critical or essential parameter to be considered, hence, to minimise the delay of the adder, a technique called sizing and ordering are required for the transistors. The purpose of the thesis is to make a fair comparison among adders over several metrics which include linearity, delay and power. Simulation results of MCCA achieved a greater significant performance upon or over RCA and KSA, and proved it is the best suitable adder for low power applications.

Today's dynamic language systems have grown to include features that resemble features of operating systems. It may be possible to improve on both by unifying a language system with an operating system. Complete unification does not appear possible in the near-term, so an intermediate system is described. This intermediate system uses a common call graph to allow components in arbitrary languages to interact as easily as components in the same language. Potential benefits of such a system include significant improvements in interoperability, improved reusability and backward compatibility, simplification of debugging and some administrative tasks, and distribution over a cluster without any changes to application code.