Abstract: A system for securely communicating over a network includes a sending device and a receiving device. The sending device includes first processing hardware configured to encrypt a symmetric key associated with the sending device with a public key associated with a receiving device. The first processing hardware is further configured to steganographically embed the symmetric key into an image. The sending device further includes a first signal interface configured to send the image to the receiving device. The receiving device includes second signal interface for receiving the image from the sending device. The receiving device also includes second processing hardware configured to decrypt the symmetric key with a private key stored on the receiving device and to further secure communications with the sender via the symmetric key.

Abstract: Systems, apparatus and methods for generating power from fluid motion, such as wind are provided. The apparatus is a wing-shaped airfoil with cup-shaped indentations that allow the airfoil to harness wind energy throughout a wide range of wind speeds and from different wind directions. The indentations harness wind energy at low wind speeds while the wing-shape generates a lifting force at high wind speeds to harness wind energy. The system comprises one or more of the devices configured in a hollow, generally cylindrical, shape and connected to a ring frame. The system rotates about an axis running through the center of the ring frame. The rotational motion of the system generates electrical power via a generator. The method is a method for generating electrical power from the rotational motion of the system.

Abstract: In the case of an electrostatic diesel exhaust filter the corona electrode and the collecting electrode are supplied with direct voltage with an AC component so as to obtain and even discharge. A catalyst, preferably in a noble metal catalyst, may placed upstream from the electrostatic filter in the exhaust gas pipe so that the hydrocarbons also contained in the exhaust gas may be oxidized.

Abstract: The invention provides an electrostatic particle filter in the case of which the collecting electrode is structured in order to make possible a reliable separation of the particles from the gases. The collecting electrode is so designed that a number of windshadow areas formed by spaces are provided in which the electrostatically attracted particles are able to be trapped without being entrained by the main current. A powerful corona discharge ensures simultaneous oxidation of combustible particles if the gas current contains oxygen.

Abstract: In a circuit arrangement for driving a current-controlled component, the current-controlled component, a controllable resistance and a current source are arranged in series. A current branch including a capacitor is arranged in parallel with the series arrangement formed by the controllable resistance and the current-controlled component.