En el caso de Microsoft, el problema es que el costo marginal del software es de cero. 而对于微软来讲,问题就在于软件的边际成本是零。 ProjectSyndicate El mayor proveedor tendrá los costos marginales más bajos y, por lo tanto, parecerá que es un “monopolio natural”. 最大供应者的...
El efecto invernadero es un fenómeno natural y beneficioso para nosotros. Determinados gases presentes en la atmósfera retienen parte de la radiación térmica emitida por la superficie terrestre tras ser calentada por el sol, manteniendo la temperatura del planeta a un nivel adecuado para el de...
A., CicchettiM., RuggeriA., GasbarriniA., CazzatoG., GioacchinoP., NavarraR., CaudaG., Romano. (2009) Valutazione costo-efficacia del percorso dei pazienti a rischio di epatite B sottoposti a test anti-HBV. PharmacoEconomics Italian Research Articles 11 , 105-119 /...
sNc. oPDcyI c=licMmw/oMnont.hDioectaerrbmoinneadtebsyangdel ether linkages were found by 1H NMR spectroscopy. No oxygen–sulfur exchange reaction occurred as confirmed by 13C NMR spectroscopy. b TOF = moles of product per mole of catalyst per hour. cBPeDcaI u=sMe wo/Mf nt.hDeetelirv...
the desired gas separation is achieved by using membranes with suitable selectivity in conjunction with appropriate operating conditions. For example, Hydrogen Membranes from Medal (Newport, Del.) are used in recovery or purification of hydrogen with preferential permeation of hydrogen and CO2. Medal al...
According to the society, Gabriel’s marksmanship and proficiency with handguns allegedly saved the village of Isola del Gran Sasso from a band of 20 Garibaldi Red Shirts in 1860. In 1860, Garibaldi’s soldiers entered the mountain village of Isola, Italy. They began to burn and pillage the...