منابع مشابه
A proof by graphical construction of the no-pumping theorem of stochastic pumps
A stochastic pump is a Markov model of a mesoscopic system evolving under the control of externally varied parameters. In the model, the system makes random transitions among a network of states. For such models, a “no-pumping theorem” has been obtained, which identifies minimal conditions for generating directed motion or currents. We provide a derivation of this result using a simple graphica...
متن کاملPumps—Shaft Sealing Systems for Centrifugal and Rotary Pumps
This standard specifies requirements and gives recommendations for sealing systems for centrifugal and rotary pumps used in the petroleum, natural gas, and chemical industries. See A.1.1 and A.1.2. It is the responsibility of the purchaser or seal vendor to ensure that the selected seal and auxiliaries are suitable for the intended service condition. It is applicable mainly for hazardous, flamm...
متن کاملEconomic optimization and comparative study of solar heat pumps
In this paper, an economic study of solar heat pumps and an investigation of differences between solar heat pumps and conventional heat pumps—based on their performances and energy consumption—are conducted for a residential apartment located in Austin, Texas, USA. Heating in the apartment is provided via a solar heat pump during the cold months of a year. Solar collectors are used to meet the ...
متن کاملAugmented Reality System and Maintenance of Oil Pumps
Qualification of employees who operate technological processes directly influences the safety of production. However, the employees’’ qualification cannot completely exclude human factor. Today, there are many technologies that can minimize or eliminate human factor impact on production safety ensuring. The augmented reality technology is an example of this technology. Nowadays, the augmented r...
متن کامل"Functional sympatholysis" in the present concept does not exist: arteriovenous pumping, supplied by capillary pumps, explains immediate exercise hyperemia.
TO THE EDITOR: We read with great interest Dr. Casey and colleagues’ (1) investigations aimed at discovering the causes of substantial reduction in forearm blood flow under hyperoxia. In our opinion, they concluded quite rightly that “functional sympatholysis” (one of the most cited, yet half a century old notion) is far from explaining the observed reduction and that it does not have a vasocon...
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: Scientific American
سال: 1895
ISSN: 0036-8733
DOI: 10.1038/scientificamerican08241895-16381bsupp