摘要:
The invention relates to hybrid membranes that are composed of an organic polymer and an inorganic polymer, a method for producing hybrid membranes, and the use of said hybrid membranes in polymer electrolyte membrane fuel cells. The inventive hybrid membranes comprise at least one alkaline organic polymer and at least one inorganic polymer. Said polymers are blended together at a molecular level. The inorganic polymer is formed from at least one precursor monomer when the membrane is produced. The disclosed membranes are characterized in that the same are provided with high absorptivity for doping agents, have a high degree of mechanical and thermal stability in both an undoped and doped state, and feature permanently high proton conductivity.
摘要:
A proton-conducting electrolyte membrane is disclosed, comprising at least one base material and at least one dopant, which is the reaction product of an at least dibasic inorganic acid with an organic compound, comprising one acidic hydroxyl group, or the condensation product of said compound with a polybasic acid. The membrane may be produced by a single step method, which avoids the use of dangerous materials and environmental pollutants. Subsequent doping of the membrane, e.g., in conjunction with assembly of the membrane electrode assembly (MEA) is not excluded. The electrolyte membrane has a high and constant mechanical stability and flexibility, excellent chemical and thermal stability and a high and constant conductivity. The membrane may be used in a fuel cell in a wide temperature range from 50° C. to more than 200° C., for example, whereby the fuel cell has a high and constant power level over the entire temperature range.
摘要:
A proton-conducting electrolyte membrane is disclosed, comprising at least one base material and at least one dopant, which is the reaction product of an at least dibasic inorganic acid with an organic compound, comprising one acidic hydroxyl group, or the condensation product of said compound with a polybasic acid. The membrane may be produced by a single step method, which avoids the use of dangerous materials and environmental pollutants. Subsequent doping of the membrane, e.g., in conjunction with assembly of the membrane electrode assembly (MEA) is not excluded. The electrolyte membrane has a high and constant mechanical stability and flexibility, excellent chemical and thermal stability and a high and constant conductivity. The membrane may be used in a fuel cell in a wide temperature range from 50° C. to more than 200° C., for example, whereby the fuel cell has a high and constant power level over the entire temperature range.
摘要:
A junction (100) for connecting two waveguides (102, 104) having a first angular offset (α) between longitudinal symmetry axes of their cross-sections, said junction (100) comprising a first interface and a second interlace for connecting said waveguides (102, 104). The junction further comprises at least a first transformer section (106) and a second transformer section (108), both having cross-sections of substantially rectangular shape, and both having said first angular offset (α) between longitudinal symmetry axes of their cross-sections. Each of said transformer sections (106, 108) has two protruded ridges (202, 204, 206, 208) on its opposite walls.
摘要:
A parabolic reflector for an antenna has a plurality of concentric annular sections arranged in series from a first annular section nearest a central axis of the reflector to a last annular section defining an outer perimeter of the reflector. Each section has a parabolic reflecting surface between inner and outer perimeters. The sections are configured such that the focal point associated with at least the last section lies inside an internal volume of the reflector and are arranged with respect to each other along the central axis, such that an overall depth of the reflector is substantially minimized. The inner perimeters of all the sections are preferably arranged to lie substantially on a plane which is perpendicular to the central axis. The outer perimeter of each section except the last section is preferably connected with the inner perimeter of the succeeding section by means of an annular strip. The strips may either each have an angle of inclination to the reflector central axis of between 0° and 3° or they may lie on respective cones running from the respective inner perimeters of the respective sections to which they are joined, to the furthest located focal point or ring.
摘要:
A junction (300) for connecting two waveguides having an angular offset between longitudinal symmetry axes of their cross-sections and a first linear offset of the center axes of the waveguides. The junction (300) comprises at least a first and a second transformer sections (202, 206) both having said first angular offset between longitudinal symmetry axes of their cross-sections and said first linear offset of their center axes, wherein each of said transformer sections (202, 206) has one protruded ridge (204, 208) on broad walls, wherein the first ridge (204) is mainly situated outside the cross section of the second transformer section 206 and the second ridge (208) is mainly situated outside the cross section of the first transformer section (202).
摘要:
A junction (300) for connecting two waveguides having an angular offset between longitudinal symmetry axes of their cross-sections and a first linear offset of the center axes of the waveguides. The junction (300) comprises at least a first and a second transformer sections (202, 206) both having said first angular offset between longitudinal symmetry axes of their cross-sections and said first linear offset of their center axes, wherein each of said transformer sections (202, 206) has one protruded ridge (204, 208) on broad walls, wherein the first ridge (204) is mainly situated outside the cross section of the second transformer section 206 and the second ridge (208) is mainly situated outside the cross section of the first transformer section (202).
摘要:
An antenna feed device (100) having a first waveguide (102) and a second waveguide (104) separated from the first waveguide (102), each of which is assigned to feed one polarization of a dedicated antenna and each of said waveguides exhibit an overall L-shape form where at least one section of the L-shape of each waveguide is in parallel to the other, both having respectively a first (106) and a second (108) antenna end ending in one plane for connection to an ortho-mode transducer associated with the antenna, while the other sections of the two L-shape waveguides extend in opposite directions, having respectively a first (110) and a second (112) radio end, each of which ends with a single waveguide port for connection to a radio equipment and the waveguides arrangement yields an overall compact T-shape interconnection of the antenna and the radios dedicated to the orthogonal polarizations.
摘要:
A junction (100) for connecting two waveguides (102, 104) having a first angular offset (α) between longitudinal symmetry axes of their cross-sections, said junction (100) comprising a first interface and a second interlace for connecting said waveguides (102, 104). The junction further comprises at least a first transformer section (106) and a second transformer section (108), both having cross-sections of substantially rectangular shape, and both having said first angular offset (α) between longitudinal symmetry axes of their cross-sections. Each of said transformer sections (106, 108) has two protruded ridges (202, 204, 206, 208) on its opposite walls.
摘要:
A junction for connecting two waveguides (101, 103) having substantially a 90-degree angular offset between longitudinal symmetry axes of their cross-sections, said junction comprising a first interface (102) and a second interface (104) for connecting said waveguides (101, 103), and further comprising at least a first transformer section (202) and a second transformer section (206), both having cross-sections of substantially rectangular shape, and both having said 90-degree angular offset between longitudinal symmetry axes of their cross-sections, wherein the first and the second transformer sections (202 and 206) are connected in a way that a T-shape connection is formed and the first transformer section (202) has a first protruded ridge (204) on its broad wall (210) and the second transformer section (206) has a second protruded ridge (208) on its broad wall (212), wherein the broad wall (212) with the second ridge (208) is connected to the top narrow wall of the first transformer section (202) and the ridges (204 and 208) are so located that they overlap.