1. A composition comprising:
a glycerol ester;
an active agent dispersed within the glycerol ester;
the composition configured to elute the active agent from the glycerol ester.
2. The composition of claim 1, the composition configured to elute the active agent in response to degradation of the glycerol ester.
3. The composition of claim 2, wherein degradation of the glycerol ester takes place under in vivo conditions.
4. The composition of claim 1, the glycerol ester comprising a glycerol ester polymer having a molecular weight of greater than or equal to 5,000.
5. The composition of claim 1, the glycerol ester comprising the esterified reaction product of a glycerol and a carboxylic acid.
6. The composition of claim 5, the carboxylic acid comprising more than one carboxylic acid group.
7. The composition of claim 1, the glycerol ester comprising the esterified reaction product of a glycerol and an acid chloride.
8. The composition of claim 1, the glycerol ester having a melting temperature Tm of greater than about 25 degrees Celsius and less than about 37 degrees Celsius.
9. The composition of claim 1, the glycerol ester comprising an ester group including a carbon chain comprising greater than or equal to 6 carbon atoms.
10. The composition of claim 1, the glycerol ester comprising an ester group comprising a prodrug.
11. The composition of claim 1, the glycerol ester comprising an ester group comprising a covalently bound anti-inflammatory agent.
12. The composition of claim 1, the glycerol ester comprising an ester group comprising a salicylate.
13. The composition of claim 1, the glycerol ester covalently bonded to a surface of a substrate through a linking group.
14. The composition of claim 13, the linking group comprising a silane compound.
15. The composition of claim 1, the glycerol ester covalently bonded to a surface of a substrate through the residue of a photoreactive group.
16. The composition of claim 1, the glycerol ester cross-linked with a cross-linking agent.
17. The composition of claim 1, further comprising a biocompatible polymer dispersed within the polyglycerol ester.
18. The composition of claim 1, further comprising a hydrophobic polymer, wherein the polyglycerol ester serves as a solvent to the hydrophobic polymer.
19. The composition of claim 1, further comprising microparticles disposed within the polyglycerol ester.
20. The composition of claim 1, wherein the glycerol backbone of the glycerol ester is fully esterified and the active agent is hydrophobic.
21. The composition of claim 1, wherein the polyglycerol ester has a viscosity of between 1,000 and 30,000 cP (centipoise) at 37 degrees Celsius.
22. A medical device comprising:
a block copolymer of the formulae:
AB, ABA, BAB, or mixtures thereof
wherein:
A represents a glycerol ester block; and
B represents at least one block selected from the group consisting of poly-lactide-co-glycolide (PLGA) and polyethylene glycol (PEG), polyesters, polyurethanes, and polycarbonates wherein the B block comprises about 1 to about 99 wt. % of the copolymer.
23. An active agent eluting device comprising:
a glycerol ester; and
an active agent dispersed within the glycerol ester;
the active agent eluting device configured to elute the active agent from the glycerol ester.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Wind power plant, especially a wind power plant with a horizontal axis, having a rotor (20) which can rotate about a rotor axis which is preferably horizontal and at least one rotor blade (30), preferably extending approximately perpendicular to the rotor axis, an adjusting means to adjust the at least one, and preferably each, rotor blade by means of which adjustment the torque generated at the rotor axis by the wind load is adjustable, and a stabilizing system with which the rotor (20) can be stabilized in at least one specified, particularly low-load rotational position (park position), characterized in that the stabilizing system has a coupling, especially a control means, which can be coupled to the adjustment means, with which, in case of deviation from the specified rotational position, especially in case of rotation of the rotor (20) out of the specified rotational position, adjustment of the at least one rotor blade (30) can be initiated to generate a torque counteracting this deviation or rotation.
2. Wind power plant according to claim 1, characterized in that the at least one rotor blade (3) with the adjusting means can be rotated at least partially about an axis of rotation which is transverse to the rotor axis and preferably parallel to the longitudinal axis of this rotor blade.
3. Wind power plant according to claim 1 or claim 2, characterized in that the at least one rotor blade (30) is assigned at least one aerodynamic aid (32) such as a camber flap, a spoiler andor a rotatable blade tip which can be adjusted with the adjusting means.
4. Wind power plant according to one of the foregoing claims, characterized in that the rotor (20) has one or two rotor blades (30) and can be stabilized in a rotational position in which the rotor blade (30) or the rotor blades (30) isare directed approximately horizontally.
5. Wind power plant according to one of the foregoing claims, characterized in that a rotational movement of the rotor (20) can be braked by adjustment of the at least one rotor blade (30) using the coupling means.
6. Wind power plant according to one of the foregoing claims, characterized in that the control means has a sensor suitable for determining the rotational position of the rotor as well as a signal processing system (100) which utilizes sensor signals representing the rotational position of the rotor (20) with a control algorithm to calculate a desired value 1, 2, for the blade adjustment, such as with respect to the longitudinal azimuthal adjustment angle, which is adjusted by the adjustment means.
7. Wind power plant according to one of the foregoing claims, characterized in that the control means is a PI controller, a PID controller, an adaptive controller, andor a fuzzy controller.
8. Wind power plant according to one of the foregoing claims, characterized in that at least one control algorithm of the control means andor its amplification(s) can be altered depending on, for instance, the wind direction determined from windvane signals.
9. Wind power plant according to one of the foregoing claims, characterized by its own energy supply means.
10. Wind power plant according to claim 9, characterized in that the energy supply means has at least one battery, capacitor, andor emergency power system, particularly a Diesel system.
11. Wind power plant according to claim 9 or claim 10, characterized in that the energy supply means has a small auxiliary wind power system preferably mounted on a machine gondola of the wind power plant.
12. Wind power plant according to claim 11, characterized in that the auxiliary wind power system has a power range of 5 to 100 kW, preferably at a nominal wind velocity above 25 ms.
13. Wind power plant according to claim 11 or claim 12, characterized in that the at least one auxiliary wind power system is a vertical-axle machine with its base within the machine gondola of the wind power plant.
14. Wind power plant according to one of claims 11 to 13, characterized by a buffer battery charged from the auxiliary wind power system, from which the adjustment means, the control means, andor optional auxiliary equipment of the wind power system can be supplied.
15. Wind power plant according to one of the foregoing claims, characterized in that the coupling means has at least one coupling system with which a rotational movement of the rotor produces an adjustment of at least one, preferably each, rotor blade through a separable direct mechanical coupling.
16. Wind power plant according to claim 15, characterized in that the coupling system has a torsion shaft (110) andor thrust rod (200) which preferably runs, at least in sections, approximately parallel to the rotor axis, within a hollow-bored main shaft (42) andor runs through a rotor bearing and acts on adjusting means (112, 114, 212, 214) preferably located inside the rotor hub (40), by which means a rotational movement of the rotor (20) causes adjustment of at least one rotor blade (30).
17. Wind power plant according to claim 16, characterized in the adjustment is produces when a relative movement occurs between the rotor (20) and the torsion shaft (110).
18. Wind power plant according to claim 16 or 17, characterized in that a first braking or arresting system (120) acting between the torsion shaft (110) and the rotor (20) and a second braking or arresting system (130) acting between the torsion shaft (110) and a nonrotating gondola of the wind power plant are assigned to the torsion shaft (110)
19. Wind power plant according to one of claims 16 to 18, characterized in that a drive means (140) is assigned to the torsion shaft (110).
20. Wind power plant according to one of claims 16 to 19, characterized in that the torsion shaft (110) runs separately from the rotor axle, at least in segments.
21. Wind power plant according to one of the foregoing claims, characterized in that the coupling means is a shiftable gear, preferably a planetary gear (150) to match the adjustment of the at least one rotor blade caused by a rotor movement to the operating state of the wind power plant.
22. Wind power plant according to one of the foregoing claims, characterized by a control system to adapt the adjustment rate of the at least one rotor blade to the current operating state on braking.
23. Wind power plant according to one of claims 16 to 22, characterized in that the control system can be operated to change the braking torque of a braking means coupled to the torsion shaft.
24. Wind power plant according to one of the foregoing claims, characterized in that the coupling means has at least one frictional coupling (113) through which the adjustment of the at least one rotor blade (30) is produced.
25. Wind power plant according to one of the foregoing claims, characterized in that the adjusting means has at least two independent adjusting systems (30, 39), one of which can operate to adjust the at least one rotor blade (30) even in case of failure of each other adjustment system.
26. Stabilizing system for a wind power plant according to one of the foregoing claims.