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Andrei Alexandrovich
Andrei Alexandrovich Grachev, Moscow RU
| Patent application number | Description | Published |
|---|---|---|
| 20090022920 | Composite Article For Conveying And/Or Storage Of Liquid and Gaseous Media And A Process For Producing The Same - The invention relates to reinforced composite articles for conveying and/or storage of liquid and gaseous media comprising an internal sealing layer of polyolefin, a sevilene layer applied thereon, an external load-bearing layer of a polymerized composite material and an additional layer formed by a fibrous structure providing for an efficient cohesion of said sealing and load-bearing layers, and disposed between the layers of sevilene and of the composite polymer material. The fibrous structure can be made of glass fiber, aramide fiber, carbon fiber and basalt fiber. A process for producing the disclosed articles is also proposed. | 01-22-2009 |
Andrei Alexandrovich Osiptsov, Moscow RU
| Patent application number | Description | Published |
|---|---|---|
| 20110272159 | HYDRAULIC FRACTURE HEIGHT GROWTH CONTROL - A method is given for creating a fracture, in a subterranean formation, that has a fluid flow barrier at the top, at the bottom, or at both the top and the bottom. The method is applied before or during a conventional hydraulic fracturing treatment and is used to limit undesired vertical growth of a fracture out of the productive zone. A lower-viscosity pad fluid is used to initiate the fracture; a higher-viscosity fluid containing barrier particles is then injected; a lower-viscosity particle-free fluid is then injected to promote settling (or rising) of the barrier particles and to finger through the slug of barrier particles and cut it into an upper and lower portion. If the barrier is to be at the bottom of the fracture, the barrier particles are denser than the fluids; if the barrier is to be at the top of the fracture, the barrier particles are less dense than the fluids. Optionally, between the barrier transport stage and the subsequent lower-viscosity stage, there may be a stage of a higher viscosity particle-free fluid that pushes the barrier particles farther into the fracture. To provide both upper and lower particles in one treatment, the pad stage may be of higher-viscosity, or the barrier particles may include particles less dense than, and more dense than, the fluid. | 11-10-2011 |
Andrei Alexandrovich Umnikov, Nizhny Novgorod RU
| Patent application number | Description | Published |
|---|---|---|
| 20090116809 | Amplifying Optical Fiber Operating At A Wavelength In The Range Of 1000-1700 nm, Methods of Fabricating The Same, And Fiber Laser - The invention relates to lasers and fiber optics. An amplifying optical fiber operating at a wavelength in the range of 1000-1700 nm comprises an oxide glass core to provide amplification and at least one oxide glass cladding. According to the invention the core contains oxides of elements selected from the group consisting of silicon, germanium, phosphorus, bismuth, aluminum, gallium at concentration of bismuth oxide of 10-4-5 mol %, concentration of silicon and germanium oxides, taken together or separately, of 70-99.8999 mol %, concentration of aluminum and gallium oxides, taken together or separately, of 0.1-20 mol % concentration of phosphorus oxide from 0 to 10 mol %, and provides a maximum optical gain at least 10 times greater than the nonresonant loss factor in the optical fiber. An outside oxide glass cladding comprises fused silica. The optical fiber core has an absorption band in the 1000 nm region, pumping to which region provides an increased efficiency of power conversion of pump light into luminescence light in the 1000-1700 nm range as compared to pumping to another absorption bands in which pumping brings about luminescence in the 1000-1700 nm range. The optical fiber emits luminescence in the range of 1000-1700 nm when excited by light with wavelengths in the range of 750-12000 nm and a half-height width of the luminescence band of more than 120 nm, and luminescence band boundaries defined as points in which the luminescence intensity drops twice relative to the intensity in the luminescence band maximum lie within the 1000-1700 nm spectral range. | 05-07-2009 |