Tài liệu Bramwell’s Helicopter Dynamics Second edition A R S 8/2009 doc

... this case the solution for the pressure at the rotor disc appears as an infinite series of pressure mode ‘shapes’ which have to be chosen to match some prescribed pressure distribution corresponding to ... is far from being linear and that there is actually an upwash over a small portion of the rear half of the rotor as well as at the leading edge. It can also be seen that the downwash is v...

Ngày tải lên: 13/02/2014, 11:20

... blade radius (Prandtl) R 0 Far wake radius R 1 , R 2 Control surface and far wake radii r Distance of blade element from hinge or axis of rotation r Radial wake coordinate r Position vector = ... and upper sides of disc plane, or aerofoil surfaces p 1 , p 2 Pressure just ahead of actuator disc, and pressure in far wake p ∞ Ambient pressure ′′ nn vp , ˆ p Notation xix Q Rotor torq...

Ngày tải lên: 05/03/2014, 15:20

... blade radius (Prandtl) R 0 Far wake radius R 1 , R 2 Control surface and far wake radii r Distance of blade element from hinge or axis of rotation r Radial wake coordinate r Position vector = ... and upper sides of disc plane, or aerofoil surfaces p 1 , p 2 Pressure just ahead of actuator disc, and pressure in far wake p ∞ Ambient pressure ′′ nn vp , ˆ p Notation xix Q Rotor torq...

Ngày tải lên: 14/03/2014, 16:20

... for diagonal matrices). Unfortunately not every operator has a diagonal matrix with respect to some basis. This sad state of affairs can arise even on complex vector spaces. For example, consider ... eigenval- ues always exist. This result is then used to show that each linear operator on a complex vector space has an upper-triangular ma- trix with respect to some basis. Similar technique...

Ngày tải lên: 17/01/2014, 04:20

... doesn’t support SRV RRs. However, a BIND 8.1.2.1 server can be used because it does support SRV RRs. Q: Our company uses a DNS server that does not support SRV resource records (RRs). Can we use it ... such as servers, applications, users, and groups. Since it stores this information in a single database and distributes this database across the network according to your configuration, yo...

Ngày tải lên: 25/01/2014, 12:20

... micrometer scale drastically decreases the volume-to-surface area ratio. Hence, the surface forces are more dominant than the body forces in such small scales. The origin of the surface forces is atomistic ... transfers happen with intermolecular and gas/wall collisions, the mean free path indicates an intrinsic length scale of thermal/fluidic transport for gases. In stan- dard pressure and t...

Ngày tải lên: 13/02/2014, 08:20

... 89 High-Temperature Pressure Sensors 93 Mass Flow Sensors 94 Acceleration Sensors 96 Angular Rate Sensors and Gyroscopes 104 Carbon Monoxide Gas Sensor 114 Actuators and Actuated Microsystems 116 Thermal ... micromachined pressure sensors described earlier. Calibration and correction of error sources are necessary for the manufacture of precision pressure sensors. A specification on accurac...

Ngày tải lên: 13/02/2014, 14:20

... Page 99 CHAPTER 8 Straddles, Strangles, and Synthetics SUMMARY This chapter reviews several delta neutral strategies including straddles, strangles, and synthetic straddles. These strategies are ... straddles and strangles have an upside-down U-shaped risk graph, which tells us that the reward is limited and the risk is unlimited. Straddles, strangles, and synthetic straddles are all delta .....

Ngày tải lên: 14/02/2014, 09:20

... miracle at the marriage feast in Cana and at his last supper, and passed into the central part of the Christian mass. Alcoholic beverages were also developed in prehistoric times in East Asia, ... factors were derived). These are averages for categories of nutrients (carbo- hydrate, fat, protein, and alcohol) and based on absorption rates as observed for typical Western diets. In Table ... wh...

Ngày tải lên: 15/02/2014, 16:20

... high-risk men Analyses of direct and indirect adherence measures, including modeling of baseline factors as adherence predictors Blacks had poorer dietary adherence and smaller decreases in ... health eduation classes (adapted from a cardiovascular disease education curriculum) twice a week and aerobics three times a week. Classes were randomized to Dance for Health or regular...

Ngày tải lên: 15/02/2014, 16:20