cardiovascular disease is the leading reason of morbidity in older people. coronary artery bypass graft (cabg) surgery is the most common type of operations in world. this study was designed to characterize comparison of early clinical outcome following on pump vs. off pump in patients over 70 years old with triple vessels disease and severe left ventricle dysfunction. 80 patients were divided ...

PROVIDENCE – Brown’s Public Health Research Day in April took on a sense of urgency as Sen. Sheldon Whitehouse delivered a sobering lecture on climate change and its effects on public health “in a time of unprecedented carbon release in the air and oceans.” Introduced by Brown President Christina Paxson, Senator Whitehouse delivered the annual Dr. and Mrs. Frederick W. Barnes Jr. Lecture on the...

This paper describes some of the challenges experienced in the application of a carbon dioxide reciprocating piston compressor to a water heating heat pump. Due to the characteristics of CO2 in a trans-critical cycle, including high pressures, high discharge temperatures, and high solubility in oil, particular difficulties may be experienced such as reduced bearing reliability caused by bearing...

We have used a metastable argon beam to expose gold-coated silicon substrates covered with a self assembled monolayer (SAM) resist. The substrates have been covered with a patterned mask, with feamres of 10 pm size, and exposed to the atomic beam. Subsequent etching revealed negative contrast patterns, consistent with the formation of a negative contamination resist in the SAM, which we attribu...

This paper presents an investigation report of different components failure which affect the performance of an automobile engine. The premature breakage of a four cylinder diesel engine block, crankshaft, camshaft, crankshaft bearing, camshaft bush, engine oil pump was reported. It is found that the failure of each component having the same reason for its failure as reported from different plac...

INTRODUCTION- Cardiovascular disease has emerged as a major health burden worldwide with coronary artery disease [CAD] causing highest mortality and morbidity. Coronary revascularization is the preferred treatment for patients with multivessel CAD. Based on the application of cardiopulmonary bypass [CPB], Coronary revascularization can be on-pump [OPCAB] or off-pump [CABG].The CPB is known to h...

In order to develop more efficient engines, it is essential to optimize the lubrication circuit of the power train systems. In this paper, during an engine design and development process, a network analysis of the engine lubrication system is described in detail. Two elements have been added to the lubrication circuit in the modified engine. These elements are hydraulic lifters and an Anti-d...

Hydraulic fracturing is used in the oil industry in order to increase the index of production and processing in the wells whose efficiencies have been dropped due to a long-term harvest or the rocks around the wells are of low permeability. Since the hydraulic fracturing operation is costly, it is of special importance to the project managers to determine the pressure required for hydraulic fra...