منابع مشابه
On The Perimeter of an Ellipse
Let E be the ellipse with major and minor radii a and b respectively, and Pbe its perimeter, then P = lim 4 tan(p/n)(a + b + 2) Σ a2 cos2 (2k-2)Pi/n+ sin2 (2k-2)Pi/n; where n = 2m. So without considering the limit, it gives a reasonable approxi-mation for P, it means that we can choose n large enough such that the amountof error be less than any given small number. On the other hand, the form...
متن کاملThe Lens Galaxy in Pg1115+080 Is an Ellipse
We use the structure of the Einstein ring image of the quasar host galaxy in the four-image quasar lens PG1115+080 to determine the angular structure of the gravitational potential of the lens galaxy. We find that it is well described as an ellipsoid and that the best fit non-ellipsoidal models are consistent with the ellipsoidal model. We find upper limits on the standard parameters for the de...
متن کاملIs Really Weather or Tropical Conditions Affects an Outbreak of COVID-19: A Brief Report
Corona viruses are large group of viruses that can cause sickness ranging from normal flu to severe respiratory diseases. The new novel corona virus (nCOV-19) or COVID-19 is a new kind of pandemic virus that did not identified before in humans. Global nations have heightened their surveillance in the quick diagnosis of potential cases across the COVID-19. After it had originated in China more c...
متن کاملIs Ligula intestinalis Really a Probable Threat for Public Health?
This article has no abstract.
متن کاملIs aquaculture really an option?
This article analyzes the impact of the introduction of aquaculture on wild fish stocks and consumer utility, taking into account three key components: (1) the dependence of aquaculture on reduction fisheries for the feeding of the farmed species; (2) biological interactions between the wild edible species –the predator– and the wild feed species –the prey–; (3) consumer preferences for wild an...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Placenta
سال: 2013
ISSN: 0143-4004
DOI: 10.1016/j.placenta.2012.12.002