نتایج جستجو برای: reflow phenomenon
تعداد نتایج: 159457 فیلتر نتایج به سال:
Instrumentation for Studying Real-time Popcorn Effect in Surface Mount Packages during Solder Reflow
Occurrence of popcorn in IC packages while assembling them onto the PCB is a well known moisture sensitive reliability issues, especially for surface mount packages. Commonly reflow soldering simulation process is conducted to assess the impact of assembling IC package onto PCB. A strain gauge-based instrumentation is developed to investigate the popcorn effect in surface mount packages during ...
Primary percutaneous coronary intervention (PCI) is the standard treatment strategy for patients with ST-elevation myocardial infarction (STEMI). However, despite the early restoration of epicardial artery flow, microvascular obstruction and reduced myocardial perfusion may occur. The " no-reflow " phenomenon is associated with a large infarct size and poor outcomes. The pathogenesis of no-refl...
As diabetic retinopathy progresses, the non-perfused area in the retina gradually enlarges as the capillaries are obstructed. To elucidate the process of capillary obstruction we examined macular capillaries in 104 diabetics, using fluorescein angiography. The follow-up period was three to eight years. We found that some capillaries in the macular were obstructed, then became unobstructed. Refl...
PURPOSE Despite successful restoration of blood flow in epicardial artery after myocardial infarction (MI), some patients do not benefit sufficiently from modern revascularisation methods due to the impairment of microcirculation, also called no-reflow phenomenon. Hyperlipidaemia is well established risk factor of coronary heart disease and its detrimental actions on vessels are widely acknowle...
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