摘要:
This invention refers to hybrid pre-polymers and polymers, produced through conversion from difunctional, oligofunctional and/or polyfunctional cyanates and/or from their pre-polymers with monomeric, oligomeric and/or polymeric silazanes. The polymers are duromers with high glass transition temperature and fracture toughness, compared to duromers from the respective cyanate source material. In their pre-polymerized state, they can be dissolved in solvents and are therefore suitable as impregnating resins for prepregs. In addition, they can be processed to become moldings. Their burning properties are described as particularly outstanding.
摘要:
The present invention relates to a feeler pin for a coordinate measuring machine. The feeler pin comprises a shaft having a first end and a second end, a fastening sleeve for fastening the feeler pin in a feeler pin holder, and an identification device for identifying the feeler pin. A feeler object is provided at the first end of the shaft, wherein the identification device can be read out via a first contact and a second contact. Further, it is provided that the second end of the shaft and the fastening sleeve are connected by a plastic section, wherein the first contact is provided by the fastening sleeve, and the second contact is provided by a rotationally symmetrical contact device which is electrically insulated from the fastening sleeve by the plastic section. Further, the present invention relates to a feeler head for holding the at least one feeler pin.
摘要:
The invention relates to the use of specific pyridines as catalysts for the dimerization of isocyanates (uretdione formation) and a process for preparing polyisocyanates having a high content of uretdione groups.
摘要:
The invention relates to a process for isocyanate modification which includes reacting a) at least one organic isocyanate having an NCO functionality greater than or equal to 1, b) a catalyst comprising at least one phosphonium salt comprising at least one cycloalkyl substituent bonded directly to a P atom of a phosphonium cation, c) optionally a solvent, and d) optionally additives. The present invention also relates to a catalyst for isocyanate modification comprising at least one phosphonium salt comprising at least one cycloalkyl substituent bonded directly to a P atom of a phosphonium cation.
摘要:
A driving device (10) for driving a unit (11) is specified, with a drive shaft (16) on which a plurality of rolling bearings (19 to 21) serving to drive respective functional elements of the unit (11) are arranged next to one another. The rolling bearings (19 to 21) are designed as unencapsulated needle bearings (22 to 24) and are arranged directly next to one another on the drive shaft (16) in such a manner that the inner ring (25, 26) of a needle bearing (22, 23) is in touching contact by means of its end surface (43, 44), which is located on an axial side, with the facing, axial end surface (46, 47) of the outer sleeve (32, 33) of the needle bearing (23, 24) following next axially (FIG. 1).
摘要:
The invention provides an electric motor (10), with a housing (12) and a cover (14) which closes the housing (12) at one axial end and carries a bearing (15) for a drive shaft (13) led through. The electric motor (10) is characterized by a partitioning (20), provided on the side of the bearing (15) facing the interior of the housing (16), of a functional part in the housing (12) to prevent media, for example liquid, from getting into the interior of the housing (16) from outside at the bearing (15).
摘要:
The present invention relates to a feeler pin for a coordinate measuring machine. The feeler pin comprises a shaft having a first end and a second end, a fastening sleeve for fastening the feeler pin in a feeler pin holder, and an identification device for identifying the feeler pin. A feeler object is provided at the first end of the shaft, wherein the identification device can be read out via a first contact and a second contact. Further, it is provided that the second end of the shaft and the fastening sleeve are connected by a plastic section, wherein the first contact is provided by the fastening sleeve, and the second contact is provided by a rotationally symmetrical contact device which is electrically insulated from the fastening sleeve by the plastic section. Further, the present invention relates to a feeler head for holding the at least one feeler pin.
摘要:
An adjustment device for a camshaft includes a brake system and a superposition gear system connected on a drive output side to the camshaft and on the drive input side to the crankshaft, such that to adjust the camshaft the superposition gear system dissipates part of the energy from the drive side into the brake system. The brake system is a frictional brake system, such that the necessary braking force is produced by a friction lining that operates in a slipping condition.
摘要:
The invention discloses mixtures consisting of two or three surfactants from the group containing secondary alkane sulfonates, α-methyl ester sulfonates and φ-methyl ester sulfonates. Said mixtures exhibit a synergistic cleaning action in comparison to the respective individual surfactants.
摘要:
A transistor is provided which advantageously utilizes a part of the area which, in conventional transistors, is provided for the isolation between the transistors. In this case, the channel width can be enlarged in a self-aligned manner without the risk of short circuits. The field-effect transistor according to the invention has the advantage that it is possible to ensure a significant increase in the effective channel width for the forward current ION compared with previously used, conventional transistor structures, without having to accept a reduction of the integration density that can be attained. Thus, by way of example, the forward current ION can be increased by up to 50%, without having to alter the arrangement of the active regions or of the trench isolation.
摘要翻译:提供了一种晶体管,其有利地利用了在常规晶体管中提供用于晶体管之间的隔离的区域的一部分。 在这种情况下,可以以自对准的方式扩大通道宽度,而不会出现短路的风险。 根据本发明的场效应晶体管的优点在于,与先前使用的常规晶体管结构相比,可以确保正向电流I ON ON的有效沟道宽度的显着增加,而没有 以接受可以实现的积分密度的降低。 因此,作为示例,正向电流I ON ON可以增加高达50%,而不必改变有源区域或沟槽隔离的布置。