摘要:
A method is provided for controlling operation of a pedal cycle (10) having a rear hub-mounted electro-mechanical transmission arrangement in which a chain-driven rear sprocket (80), an input electrical machine (120) and the hub (100) are each coupled to a respective branch of a three-branch epicyclic gear set (140). Allowing for natural variations in input torque by a cyclist over a cycle of the crank arms (50), a substantially constant current is caused to exist in the input electrical machine (120) such that a change in torque applied by the cyclist results in a change in transmission ratio between the rear sprocket (80) and the hub (100), thereby providing a form of automatic and continuously variable transmission for the pedal cycle (10).
摘要:
The present invention relates to branched polyarylene ethers (A) comprising branching sites of the formula (I): The present invention further relates to a process for preparing the branched polyarylene ethers (A) and to thermoplastic molding materials comprising the branched polyarylene ethers (A) and further thermoplastic polymers (B). The present invention finally relates to the use of the thermoplastic molding materials for producing moldings, and to moldings obtainable from the aforementioned thermoplastic molding materials.
摘要:
Thermoplastic molding compositions, comprising A) from 10 to 95% by weight of a thermoplastic polyamide, B) from 5 to 90% by weight of an acrylate rubber, obtainable via free-radical-initiated aqueous emulsion polymerization of ethylenically unsaturated monomers in the presence of at least one dispersing agent and of at least one free-radical initiator, where the emulsion polymerization uses from 1 to 50% by weight of an alkene having from 5 to 12 carbon atoms [monomer A], and from 50 to 99% by weight of an ester based on an α,β-monoethylenically unsaturated mono- or dicarboxylic acid having from 3 to 6 carbon atoms and on an alkanol having from 1 to 12 carbon atoms [monomer B], and also, if appropriate, up to 10% by weight of an α,β-monoethylenically unsaturated mono- or dicarboxylic acid having from 3 to 6 carbon atoms and/or its amide [monomer C], and up to 30% by weight of an α,β-ethylenically unsaturated compound different from the monomers A to C [monomer D], and the monomers A to D give a total of 100% by weight, C) from 0 to 40% by weight of a copolymer which comprises vinylaromatic monomer units, D) from 0 to 70% by weight of further additives, where the total of the percentages by weight of A) to D) is 100%.
摘要:
Thermoplastic molding compositions comprising A) from 40 to 96.2% by weight of a semiaromatic polyamide, B) from 2 to 30% by weight of an impact-modifying polymer which comprises functional groups, C) from 1 to 50% by weight of fibrous or particulate fillers or a mixture of these, D) from 0.2 to 5% by weight of a lubricant, E) from 0.5 to 15% by weight of an electrically conductive additive, F) from 0 to 30% by weight of other added materials, where the total of the percentages by weight of components A) to F) is 100%.
摘要:
The present invention relates to a process for preparation of copolymers A) comprising A1) one or more vinylaromatic monomers, A2) one or more vinyl cyanides, and A3) one or more dicarboxylic anhydrides via bulk polymerization or via solution polymerization,an important feature of the invention being that the polymerization is carried out in the presence of from 0.01 to 0.5% by weight of water, based on the total weight of the polymerization mixture.The present invention further relates to the copolymers A), to thermoplastic molding compositions comprising the copolymers A), to the use of the copolymers A) and of the thermoplastic molding compositions, and also to the moldings, foils, fibers, or foams obtainable from the copolymers A) or from the thermoplastic molding compositions.
摘要:
Thermoplastic molding compositions, comprising A) from 10 to 97.5% by weight of at least one thermoplastic polyester A, B) from 1 to 97.5% by weight of at least one graft polymer B composed of b1) from 40 to 80% by weight of a graft base composed of an elastomeric polymer B1 based on alkyl acrylates having from 1 to 8 carbon atoms in the alkyl radical, on ethylene/propylene, on dienes, or on siloxanes, and with a glass transition temperature below 0° C., b2) from 20 to 60% by weight of a graft B2 composed of b21) from 60 to 95% by weight of styrene or of substituted styrenes B21 of the general formula I where R is a C1-8-alkyl radical or hydrogen and R1 is a C1-8-alkyl radical and n is 1, 2, or 3, or a mixture of these, and b22) from 5 to 40% by weight of at least one unsaturated nitrile B22, C) from 1 to 97.5% by weight of at least one thermoplastic copolymer C composed of c1) from 60 to 85% by weight of styrene or of substituted styrenes C1 of the general formula 1, or a mixture thereof, and c2) from 15 to 40% by weight of at least one unsaturated nitrile C2, D) from 0.5 to 50% by weight of at least one copolymer D, obtainable via reaction of d1) from 5 to 95% by weight of at least one thermoplastic methacrylate polymer D1 comprising at least one type of functional groups, selected from epoxy, carboxy, hydroxy, anhydride, and oxazoline, with d2) from 5 to 95% by weight of at least one thermoplastic polyester D2, E) from 0 to 40% by weight of at least one filler E, F) from 0 to 2% by weight of at least one organic acid F, G) from 0 to 25% by weight of at least one halogen-free phosphorus compound G, H) from 0 to 45% by weight of other additives H, where the entirety of components A to H always gives 100%.
摘要:
Semiconductor wafers of silicon are produced by pulling a single crystal growing on a phase boundary from a melt contained in a crucible and cutting of semiconductor wafers therefrom, wherein during pulling of the single crystal, heat is delivered to a center of the phase boundary and a radial profile of a ratio V/G from the center to an edge of the phase boundary is controlled, G being the temperature gradient perpendicular to the phase boundary and V being the pull rate. The radial profile of the ratio V/G is controlled so that the effect of thermomechanical stress in the single crystal adjoining the phase boundary, is compensated with respect to creation of intrinsic point defects. The invention also relates to defect-free semiconductor wafers of silicon, which can be produced economically by this method.
摘要:
A method is provided of processing digital image data representing an image of an object to determine data representing a boundary for said object, the method comprising: inputting said image data; initializing a level set function representation of an interface for approximating said boundary; determining a motion of said interface subject to a combined cost function comprising a first cost comprising a signed distance constraint on said interface level set function representation and a second cost comprising a measure of said interface responsive to a density or metric of said image; modifying said level set function representation of said interface in accordance with said determined motion; repeating said determining and modifying such that said interface converges on said boundary; and determining boundary data representing said boundary from said converged level set function interface representation.
摘要:
A silicon single crystal which, over an ingot length of over 10 percent of the total ingot length, has a uniform defect picture and narrow radial dopant and oxygen variations. The process in accordance with the Czochralski method involves bringing about a temperature distribution in the melt in the region of the solidification interface which deviates from rotational symmetry.
摘要:
The present invention relates to molding compositions comprising A) from 39 to 99% by weight of at least one polyarylene ether sulfone built up from bifunctional monomer units, B) from 1 to 20% by weight of at least one polyarylene ether sulfone containing, based on the total weight of component B, from 0.1 to 10% by weight of units which derive from 1,1,1-tris(4-hydroxyphenyl)ethane, C) from 0 to 60% by weight of at least one filler, D) from 0 to 40% by weight of at least one impact-modifying rubber, and E) from 0 to 40% by weight of one or more various additives, where the percentages by weight of components A to E give 100% in total, and also to a process for preparing these molding compositions, to their use, and to moldings, films, fibers, or foams obtainable from these molding compositions.