Abstract: It is proposed herein to improve the specifications of a low-noise amplifier (LNA) by integrating it in a chip. In order to cover a range of operating frequencies using a single chip, the integrated-circuit amplifier proposed herein comprises an input port configured to receive a magnetic resonance (MR) signal from a radio-frequency (RF) coil, one or more LNAs configured to amplify the received MR signal, and an output port configured to output the amplified MR signal from the one or more LNAs. The operating frequency of the RF coil depends on the field strength, The matching circuit, if present, needs to be tuned to operate at the operating frequency of the RF coil, and depends on the component values in the loop, thus on loop size. In contrast, the proposed integrated-circuit amplifier is capable of directly connecting to RF coils with different loop sizes, without the need for a matching circuit.

Abstract: The present invention relates to a magnetic resonance imaging system, to a magnetic resonance imaging method for operating a magnetic resonance imaging system and to a computer program for operating a magnetic resonance imaging system.

Abstract: A radio-frequency (RF) coil array for receiving magnetic resonance (MR) signals wherein the RF coil array (402) comprises at least one RF receive coil with an associated electronic circuit, a rechargeable electrical storage device arranged to supply electrical power to the associated electronic circuit, and a charging circuit arranged to charge the rechargeable electrical storage device, wherein the charging circuit includes a switching circuit (102SW1, 102SW2, 104SW1, 104SW2, 106SW1, 106SW2, 108SW1, 108SW2) configured to electrically isolate the charging circuit from the RF coil array at least when the RF receive coil is receiving MR signal. During a time period when the RF receive coil is not receiving MR signal and/or when another RF coil is not transmitting RF signals in the presence of the RF receive coil, the switching circuit switches the charging circuit to an ON state which enables the charging circuit to charge the rechargeable electrical storage device.

Abstract: A radio frequency antenna comprising a resonant pickup circuit (102) arranged to pick up a magnetic resonance signal, an analog-to-digital converter (105) arranged to convert the magnetic resonance signal to digital data, and a frequency converter arranged to convert a primary band of frequencies of the digital data. By upshifting the frequency of the transmitted bit-stream, it is possible to RF-trap the transmission channel (109) by simple high-pass filtering techniques. In case the transmitted bit pattern has frequency components that approach the resonance frequency, an encoding technique like Manchester encoding can be used to eliminate unwanted signals.

Abstract: The present invention relates to a magnetic resonance imaging system, to a magnetic resonance imaging method for operating a magnetic resonance imaging system and to a computer program for operating a magnetic resonance imaging system.

Abstract: A current measurement circuit to measure the output of a power supply transformer includes a simulation capacitor having a capacitance proportional to a parasitic capacitance of the transformer. The first electrode of the capacitor is coupled to an output winding of the transformer and the second electrode is coupled to a first node, with a second sense resistor coupled between the first node and ground so that current flowing through the simulation capacitor flows through the second sense resistor. Current flowing through a first sense resistor coupled to a second node and to ground has a component representative of the output current of the power supply and a component representative of the parasitic current. A differential amplifier coupled at an inverting input to the first node and at a non-inverting input to the second node generates an output signal that is proportional to the output current of the power supply.

Abstract: The subject invention provides new progestogen esters and uses thereof.

Abstract: A power supply is modified with a current measurement circuit to measure the output of the power supply having a transformer exhibiting a parasitic capacitance.

Abstract: A printer apparatus includes a photoreceptor, a magnetic roll, an electrode, a current source coupled to the electrode, the current source having a signal generator coupled to an input winding of a transformer that exhibits a parasitic capacitance; and a current measurement circuit. The current measurement circuit includes a simulation capacitor having a capacitance proportional to the parasitic capacitance, the simulation capacitor having a first electrode coupled to a hot terminal of the output winding of the transformer and a second electrode coupled to a first node, a second sense resistor coupled between the first node and ground so current flowing through the simulation capacitor flows through the second sense resistor, a first sense resistor coupled to a second node, and a differential amplifier having an inverting input coupled to the first node and a non-inverting input coupled to the second node.

Abstract: A hydraulically controllable constant speed drive, includes an input shaft (10) provided with an input pulley (1), an output shaft (20) provided with an output pulley (2) and a drive belt (3). Each pulley (1; 2) is provided with two pulley sheaves (11, 12; 21, 22) that are mutually axially displaceable under the influence of a hydraulic pressure to be exerted in a piston-cylinder assembly (14, 15; 24, 25) associated with the pulley (1, 2) and that define a tapered groove of variable axial width wherein the drive belt (3) is accommodated. An input spring (17) is provided that realizes an axial force urging the pulley sheaves (11, 12) of the input pulley (1) towards each other to prevent slip of the drive belt (3) when the hydraulic pressure is negligible.

Abstract: A current measurement circuit for measuring the output of a power supply having a signal generator inputting a signal to an input winding of a transformer exhibiting a parasitic capacitance capable of being modeled by an equivalent parasitic capacitor coupled between a hot terminal of an output winding of the transformer and ground is provided. The current measurement circuit comprises a simulation capacitor, a second sense resistor, a first sense resistor and a differential amplifier. The simulation capacitor has a capacitance proportional to the parasitic capacitance of the transformer. The simulation capacitor has a first electrode coupled to the hot terminal of the output winding of the transformer and a second electrode coupled to a first node. The second sense resistor is coupled to the first node and to ground so that the current flowing through the simulation capacitor flows through the second sense resistor.

Abstract: The subject invention provides a pharmaceutical formulation in the form of an oily solution for injection to a subject comprising a contraceptively and/or therapeutically effective amount of a long-acting progestogen and a contraceptively and/or therapeutically effective amount of a long-acting androgen dissolved in a pharmaceutically acceptable oily medium wherein the injection is administered by the subject itself with a needle-less device, a mini-needle device or a pre-filled subcutaneous syringe.

Abstract: The invention is the novel androgen (7?,17?)-7-methyl-17-[(1-oxoundecyl)oxy]estr-4en-3one (MENT undecanoate). This compound distinguishes favourably from other testosterone derivatives in that it has a good solubility in oily media. It particularly exhibits a good dissolved potency relative to testosterone. The compound is particularly suitable for administration by means of injection.

Abstract: The subject invention provides new progestogen esters and uses thereof.

Abstract: A wheel hub-and-bearing set assembly for a roller skate includes a spacer, a sleeve formed with a first flange at one end thereof and having an outer face, a pair of bearings mounted in a space between the spacer and the sleeve, a hub body sleeved on the sleeve, and a bearing cap disposed at the other end of the sleeve and formed with a second flange that cooperates with the first flange and the outer face to define a retaining space thereamong. The hub body is formed with a tongue that is fittingly received in the retaining space.

Abstract: The proposed MRI apparatus provides a solution to the problem of a limited number of receiver channels. The main idea is to make use of the imaging parameters when selecting and/or combining the RF signals of at least two RF coils into separate receiver channels. Such an imaging parameter may be, for example, the phase encoding direction.

Abstract: An in-line skate includes a skate frame, front and rear wheels mounted rotatably on the skate frame, and a middle wheel assembly including at least two middle wheels, each of which is mounted rotatably on the skate frame between the front and rear wheels, is aligned with the front and rear wheels, and is rotatable about a rotation axis defined by the middle wheel. Each middle wheel further defines a wheel center and an inclined plane that passes through the wheel center and that is perpendicular to the rotation axis. The inclined plane is inclined relative to a vertical plane perpendicular to a ground plane by an acute angle. The front and rear wheels are inclined in the same direction as the middle wheels.

Abstract: A roller skate frame assembly includes a frame body with front and rear shoe-mounting plates that are formed with fastening holes, a pair of fastening units, and a bracket with front and rear mounting units, each of which has a first part secured to a shoe, and a second part formed with a fastening hole and secured to a respective one of the front and rear shoe-mounting plates through a respective one of the fastening units which extends through a pair of the fastening holes in the second part and the respective one of the front and rear shoe-mounting plates.

Abstract: A roller skate frame includes a wheel-mounting plate for mounting wheels thereon, a shoe-mounting plate projecting transversely from a top end of the wheel-mounting plate and disposed at one side of the wheel-mounting plate that is opposite to the wheels, a plurality of wheel-mounting protrusions projecting from the wheel-mounting plate, and a plurality of reinforcing ribs, each of which projects transversely from a bottom end of the wheel-mounting plate and interconnects two adjacent ones of the protrusions.

Abstract: A roller skate frame assembly includes a frame body with front and rear shoe-mounting plates that are formed with fastening holes, a pair of fastening units, and a bracket with front and rear mounting units, each of which has a first part secured to a shoe, and a second part formed with a fastening hole and secured to a respective one of the front and rear shoe-mounting plates through a respective one of the fastening units which extends through a pair of the fastening holes in the second part and the respective one of the front and rear shoe-mounting plates.