1,290 research outputs found
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
Microstructure Development during Solidification of Aluminium Alloys
No full textThis Thesis demonstrates studies on microstructure development during the solidification of aluminium alloys. New insights of structure development are presented here. Experimental techniques such as quenching and in-situ High-brilliance X-ray microscopy were utilized to study the microstructure evolution during solidification.Materials Science and EngineeringMechanical, Maritime and Materials Engineerin
Peritoneal dialysis in congestive heart failure
No full textHeart failure is a major and growing health problem. There have been major advances in the understanding of pathophysiology of heart failure as a chronic progressive disorder, which has led to newer therapies. Whatever the etiology, many heart failure patients eventually progress to a refractory stage characterized by worsening renal function and resistance to diuretic therapy with attending severe edema. A logical treatment for this “cardiorenal syndrome” is the use of dialysis, which is efficient in treating both the hypervolaemia and azotaemia of refractory heart failure. Though all modalities of dialysis have been tried, peritoneal dialysis (PD) is the simplest choice and offers several advantages. It is an already established long-term home-based therapy and does not require complex machinery or hospital resources. PD is associated with preservation of residual renal function, gentle continuous ultrafiltration, hemodynamic stability, better middle molecule clearance, sodium seiving with maintenance of normonatremia and maybe less inflammation, especially with newer solutions, compared to hemodialysis. In this paper we discuss the potential advantages of PD in the treatment of heart failure, review available literature and lay some foundation for future research
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