Vascular resistance recent results showing the sheath flow surrounding the plug flow in a vessel, the sheath flow size is not neglectible in the real blood flow velocity profile in a vessel. The velocity profile is directly linked to flow resistance in a vessel. The viscosity variations, according to Thurston, are also balanced by the sheath flow size around the plug flow. The secondary regulators of vascular resistance, after vessel radius, is the sheath flow size and its viscosity. Thurston, as well, shows that the resistance R is constant, where, for a defined vessel radius, the value η(δ)/δ is constant in the
What Is to Be Done? (novel) What Is to Be Done? (novel) What Is To Be Done? (; also translated as What Shall We Do? and literally translated as "What To Do?") is an 1863 novel written by the Russian philosopher, journalist and literary critic Nikolai Chernyshevsky. It was written in response to "Fathers and Sons" (1862) by Ivan Turgenev. The chief character is a woman, Vera Pavlovna, who escapes the control of her family and an arranged marriage to seek economic independence. The novel advocates the creation of small socialist cooperatives based on the Russian peasant commune, but oriented toward industrial production. The author promoted