Siemens Aktiengesellschaft

Wolfgang Frie

Hans-Joachim Henkel

Horst Siebold

Christian Koch

Paul Hini

Eugen Szabo De Bucs

A magnetic resonance imaging apparatus generates tomograms according to the echo planar imaging method (EPI), with at least one of the gradient coils having a resonant circuit allocated thereto which is excited by an amplifier. A capacitor forms a series resonant circuit with the gradient coil, and a controlled gain amplifier which is operated as a current regulator, such as a switched current regulator, is connected to this series resonant circuit. The read-out gradient G.sub.x is switched on at a time t.sub.0, the gradient G.sub.x having a transient region .tau..sub.1 beginning at t.sub.0 and ending at a time t.sub.2. The gradient current I(t) is steady in this transient region .tau..sub.1, and the integral of the gradient current I(t) over t.sub.0 through t.sub.2 is zero.

Magnetic resonance imaging apparatus and method for operating same

In a reformed gas generator, where evaporated or atomized liquid higher hydrocarbons are reacted with an oxygen containing gas at elevated temperature to form a gas mixture containing methane, carbon monoxide and/or hydrogen, and wherein the reactants to be converted may be heated, if desired, to an elevated input temperature before they are conducted into the reformed gas generator, with throughput of reactants variable; and the air number of the oxygen containing gas between 0.05 and 0.2, a gas containing the oxygen only in free form is used, no external heat is supplied to the reformed-gas generator, and, with changing throughput, the air number and/or the input temperature is controlled so that the degree of conversion of the hydrocarbons is between 60 and 95% to give a method particularly well suited to operate an internal combustion engine with the generated reformed gas.

Method for operating a reformed-gas generator

According to the invention, the fuel is supplied to the reformed-gas generator in an amount at least approximately proportional to the instantaneous demand of the internal-combustion engine and is mixed there, in atomized or evaporated form, with so much air and/or fed-back exhaust gas drawn in through the reformed-gas generator that for the air component of the mixture, the air number for the reaction of the fuel in the converter is at least 0.05 but not more than 0.5 and the exhaust gas component does not fall below the exhaust gas quantity equivalent to the air number 0.05 and does not exceed the exhaust gas quantity equivalent to the air number 0.5. The fuel gas mixture produced in this manner, prior to being fed to the combustion chambers of the internal-combustion engine, is mixed with enough additional air sucked in by the internal-combustion engine such that the air number for the combustion in these combustion chambers is at least equal to 1.

Growing community of inventors

Erlangen, Germany

Wolfgang Frie