منابع مشابه
Melting Point Determination
An improved technique is described for the accurate determination of melting points of metals in the temperature range 1500° to 2500°C. The improvements consist of gradient heating and refinements in cavity preparation to obtain true black-body conditions. The melting point of hafnium, as determined by this method, is set a t 22220-+30°C. This is over 200°C higher than one of the values reporte...
متن کاملOcular Tuberculosis with Progressive Unilateral Corneal Melting
OBJECTIVES In this case report, we present a patient with ocular tuberculosis presenting with progressive unilateral corneal melting. PATIENT A 47-year-old female was admitted with melting at the inferior half of the peripheral cornea and inferior subconjunctival nodules. Biopsy material of the nodules was negative for tuberculosis bacillus. However, polymerase chain reaction of the biopsy sa...
متن کاملSolid clusters above the bulk melting point
The fact that the melting points of nanoparticles are always lower than those of the corresponding bulk material is a paradigm supported by extensive experimental data for a large number of systems and by numerous calculations. Here we demonstrate that tin cluster ions with 10-30 atoms remain solid at approximately 50 K above the melting point of bulk tin. This behavior is possibly related to t...
متن کاملHeat capacity of rare earth metals near the melting point and the vacancy mechanism of melting
The vacancy mechanism of the melting process is utilized as a starting point for deriving the formula for the difference of the heat capacity of the liquid and solid metal in the neighbourhood of the melting point. From these calculations it follows that the difference C,, C,, is the same for all the metals and equals 3.50 J g.atom-' K-'. This result is compared with the existing in the literat...
متن کاملSpontaneous corneal melting in pregnancy: a case report
BACKGROUND To report a case of spontaneous corneal melting in pregnancy. We reviewed the literature on corneal melting and the effect of pregnancy on cornea and collagen containing tissues. CASE PRESENTATION A 29-year-old woman who underwent radial keratotomy in both eyes followed by trabeculectomy in her left eye developed corneal melting in the same eye, in her seventh month of pregnancy. D...
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ژورنال
عنوان ژورنال: Eye
سال: 2012
ISSN: 0950-222X,1476-5454
DOI: 10.1038/eye.2012.136