Need an account? Click here to sign up. Download Free PDF. Joaneson Lacour. Osnick Joseph. A short summary of this paper. Download Download PDF. Translate PDF. Expansion de la ressource de base Etudes de terrain Politiques sous-sectorielles Instruments juridiques Relief et pentes Occupation des sols Risque Erosion Etat des lieux des ressources naturelles Bilan hydrique Il a pour objectif le drainage des eaux pluviales de la capitale. Selon ce document. Le climat est aride au niveau du sous- bassin 11c 9.
Sur une superficie totale de 70 Peuplements de mangrove mg 43 6. Urbains continus ou 11, 12 discontinus Zones humides 62 Ainsi, distingue-t-on des zones arides On most books, the ISBN number can be found on the back cover, next to the barcode.
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The variable stator vane airfoil design is robust to this range of variation without impairment of mechanical and aerodynamic functions. The coordinate values given in scalable TABLE 1 below provide the nominal profile for exemplary stages of a variable stator vane.
Specifically, a third variable stator vane of, for example, a 9HA. Consequently, the coordinate values set forth in TABLE 1 may be non-scaled, scaled upwardly, or scaled downwardly such that the general airfoil profile shape remains unchanged. The constant number may be a fraction, decimal fraction, integer or mixed number.
The disclosed airfoil shape thus may increase reliability and may be specific to the machine conditions and specifications. The airfoil shape provides a unique profile to achieve 1 interaction between other stages in the compressor; 2 aerodynamic efficiency; and 3 normalized aerodynamic and mechanical blade or vane loadings. As also noted, any scale of the disclosed airfoil may be adopted as long as 1 interaction between other stages in the compressor; 2 aerodynamic efficiency; and 3 normalized aerodynamic and mechanical blade loadings are maintained in the scaled compressor.
The airfoil described herein thus improves overall compressor efficiency. The airfoil also meets all aeromechanics, loading and stress requirements. It should be apparent that the foregoing relates only to certain embodiments of the present application and the resultant patent. Numerous changes and modifications may be made herein by one of ordinary skill in the art without departing from the general spirit and scope of the invention as defined by the following claims and the equivalents thereof.
We claim: 1. An article of manufacture having a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y, and Z set forth in scalable TABLE 1, wherein the Cartesian coordinate values of X, Y, and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y, and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete airfoil shape.
The article of manufacture according to claim 1 , wherein the article of manufacture comprises an airfoil. The article of manufacture according to claim 1 , wherein the article of manufacture comprises a variable stator vane configured for use with a compressor. The article of manufacture according to claim 1 , wherein the number, used to convert the non-dimensional values to dimensional distances, is at least one of a fraction, a decimal fraction, an integer, and a mixed number.
The article of manufacture according to claim 1 , wherein a height of the article of manufacture is about 1 inch to about 30 inches about 2. An article of manufacture having a suction-side nominal airfoil profile substantially in accordance with suction-side Cartesian coordinate values of X, Y, and Z set forth in scalable TABLE 1, wherein the Cartesian coordinate values of X, Y, and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y, and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete suction-side airfoil shape, the X, Y, and Z coordinate values being scalable as a function of the number to provide at least one of a non-scaled, scaled-up, and scaled-down airfoil profile.
The article of manufacture according to claim 7 , wherein the article of manufacture comprises an airfoil. The article of manufacture according to claim 7 , wherein the article of manufacture comprises a variable stator vane configured for use with a compressor. The article of manufacture according to claim 7 , wherein the number, used to convert the non-dimensional values to dimensional distances, is at least one of a fraction, a decimal fraction, an integer, and a mixed number. The article of manufacture according to claim 7 , wherein a height of the article of manufacture is about 1 inch to about 30 inches about 2.
The article of manufacture according to claim 7 , further comprising the article of manufacture having a pressure-side nominal airfoil profile substantially in accordance with pressure-side Cartesian coordinate values of X, Y, and Z set forth in the scalable table, wherein the Cartesian coordinate values of X, Y, and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y, and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete pressure-side airfoil shape, the X, Y, and Z values being scalable as a function of the number to provide at least one of a non-scaled, scaled-up, and scaled-down airfoil.
A compressor comprising a plurality of variable stator vanes, each of the variable stator vanes including an airfoil having a suction-side airfoil shape, the airfoil having a nominal profile substantially in accordance with suction-side Cartesian coordinate values of X, Y, and Z set forth in scalable TABLE 1, wherein the Cartesian coordinate values of X, Y, and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y, and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete suction-side airfoil shape.
The compressor according to claim 14 , wherein the number, used to convert the non-dimensional values to dimensional distances, is at least one of a fraction, a decimal fraction, an integer, and a mixed number.
The compressor according to claim 14 , wherein a height of each variable stator vane is about 1 inch to about 30 inches about 2. The compressor according to claim 14 , further comprising each of the plurality of variable stator vanes having a pressure-side nominal airfoil profile substantially in accordance with pressure-side Cartesian coordinate values of X, Y, and Z set forth in the scalable table, wherein the Cartesian coordinate values of X, Y, and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y, and Z by the number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete pressure-side airfoil shape.
The value is very close to unity. The mobility of an average impurity concentration of 6. Comparing the equations with Eq. Referring Eq. The neutral base width should be 0. The impmity concentration of the n1 region is cm Qot q d Co The bandgap in degenerately doped Si is around 1eV due to bandgap-narrowing effect.
Pros: 1. Higher operation speed. High device density Cons: 1. More complicated fabrication flow. High manufacturing cost. Therefore, From Eq. The pinch-off voltage is qN D d12 1. The pinch-off voltage is 1. By neglecting the second term in Eq. For same energy but a width of 8 meV, we use the same well thickness of 6. The resonant-tunneling current is related to the integrated flux of electrons whose energy is in the range where the transmission coefficient is large.
From Eqs. The Fresnel transmission coefficient from Eq. We assume a conventional p-n junction laser and a stripe DH laser have the same active area. It is impractical. Take the solution which is the only practical one, i. The threshold current in Fig. The photons with 1. However, since the cells are in series, the top cell wiI1 block the current generated by the bottom cell once the current is larger than the top cell's dark saturation current va1ue.
We can assume that absorption and hence photogeneration occurs over the entire i layer. The earth is hotter. The efficiencies are The segregation coefficient of boron in silicon is 0. It is smaller than unity, so the solubility of B in Si under solid phase is smaller than that of the melt. Therefore, the excess B atoms will be thrown-off into the melt, then the concentration of B in the melt will be increased.
The tail-end of the crystal is the last to solidify. Therefore, the concentration of B in the tail-end of grown c1ystal will be higher than that of seed-end. The reason is that the solubility in the melt is prop01tional to the temperature, and the temperature is higher in the center prut than at the perimeter. Therefore, the solubility is higher in the center prui, causing a higher impmity concentration there.
The segregation coefficient of Ga in Si is 8 x 1o-3 FromEq. We have from Eq. The corresponding doping concentration varies from 2. From the Fig.
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