Abstract To enhance the heat transfer efficiency of spiral wound exchanger, a grooved exchanger (GSWHE) was proposed. A test platform accomplished to experimentally investigate performance with comparison (SWHE). The uncertainty analysis experiment conducted, maximum relative error being not more than ±5%. comprehensive coefficient GSWHE is higher that SWHE when cooling water flow rate low. det...

The present work is an examination of the fine structure of corneal vessels in advanced stages of wound healing in the Sprague-Dawley rat. Several weeks after burning the central cornea with silver nitrate or a cautery iron, vascularized corneas classified as ''healed" mildly wounded, or moderately to severely wounded were selected for electron microscopic observation. In all cases the blood ve...

The membrane architecture of the cytoplasmic tubules in lamprey chloride cells has been studied by electron microscopy using thin-section and freeze-fracture techniques. The chloride cell of lampreys (Lampetra japonica, Petromyzon marinus) is largely occupied with a continuous network of cytoplasmic tubules, which are derived from the invagination of the basolateral plasma membrane. The lumenal...

Chitosan, a naturally occurring polysaccharide with abundant resources, has been extensively exploited for various biomedical applications, typically as wound dressings owing to its unique biocompatibility, good biodegradability and excellent antibacterial properties. In this work, composite nanofibrous membranes of chitosan (CS) and silk fibroin (SF) were successfully fabricated by electrospin...

the gas separation performance of commercial ceramic titania and hybrid silica (hybsi®) membranes was assessed using the gas permeation and permporometry methods. results indicated that the hybsi® membranes have a hybrid surface containing regions covered by a polymeric matrix and others with inorganic pores. these membranes have high h2 selectivity, which increases significantly with temperatu...

The presence at CT scan of more retained bullets than expected could be a very difficult interpretation challenge in the early management of gunshot wounds. The modern non operative management of haemodinamically stable patients without peritonitis requires that the trajectory of the bullet is clearly recognized. This clinical case reporting of a gunshot wound without evident entry hole, allows...

The role of calcium in the healing of wounds made in the ectoderm of Xenopus neurulae has been studied. Embryos have been wounded in the presence of calcium inhibitors, and the effects on wound healing observed by scanning electron microscopy. In addition, unwounded embryos have been exposed to a local application of ionophore A23187 to simulate the possible calcium fluxes following wounding. L...

The major constraint that limits tissue storage is the accumulation of cellular damage or wounding by the storage conditions and consequential loss of tissue viability. The noun wound is used in the medical field to refer to a disruption of tissue integrity that follows trauma. Subsequent wound healing results from exposure to supraphysiological forces or is the consequence of action by reactiv...

Multi-objective optimization using genetic algorithm (GA) is carried out for the desalination of brackish and sea water using spiral wound or tubular modules. A few sample optimization problems involving two and three objective functions are solved, both for the operation of an existing plant (which is almost trivial), as well as, for the design of new plants (associated with a higher degree of...