Abstract: An object is to detect a trace substance and to generate energy by adsorption of the trace substance. A device includes a first electrode and a second electrode, wherein the first electrode and the second electrode are not electrically connected, a shortest distance between the first electrode and the second electrode is 0.001 ?m or more and 100 ?m or less, an absolute value of a difference between a standard electrode potential of the first electrode and a standard electrode potential of the second electrode is 0.1 V or more, and surfaces of the first electrode and the second electrode are partly or entirely exposed.

Abstract: An object is to provide a sensor system including a sensor that operates on a self-sustaining power source. A sensor system includes one or more sensors and a computer device capable of making a communication connection with the sensor, the sensor including: a first conductive part and a second conductive part; and a functional part, the first conductive part and the functional part being connected to each other, the second conductive part and the functional part being connected to each other, the first conductive part and the second conductive part being not in contact with each other, and the functional part operating by an input voltage generated when at least a part of the first conductive part and the second conductive part comes into contact with water, and transmitting a signal to the computer device.

Abstract: An object is to provide a device that operates on a self sustaining power source. A device comprising that operates on a self-sustaining power source includes: 2n electrodes (n is an integer of 2 or more) from a first electrode to a 2n-th electrode; and a medium present between a (2k?1)-th electrode (k is an integer of 1 or more and less than n) and a 2k-th electrode and between a (2n?1)-th electrode and the 2n-th electrode. The 2k-th electrode is connected to a (2k+1)-th electrode, and an impedance between a point in the medium between the (2k?1)-th electrode and the 2k-th electrode and a point in the medium between the (2k+1)-th electrode and a (2k+2)-th electrode is greater than or equal to 5 times each of an impedance between the (2k?1)-th electrode and the 2k-th electrode and an impedance between the (2k+1)-th electrode and the (2k+2)-th electrode.

Abstract: A device capable of operating on a standalone power source includes: a first conductive part and a second conductive part; and a functional part, wherein the first conductive part and the functional part are connected to each other, the second conductive part and the functional part are connected to each other, the first conductive part and the second conductive part are not in contact with each other; and the device is energized by bringing the first conductive part and the second conductive part into contact with a body.

Abstract: An object is to provide a sensor system comprising a sensor operating on a self-sustaining power source. A sensor system comprising a plurality of sensors installed at different positions, each of the sensors including a first conductive part and a second conductive part, a medium, and a functional part, the first conductive part and the functional part being connected to each other, the second conductive part and the functional part being connected to each other, at least a part of the first conductive part and the second conductive part being in contact with the medium, the first conductive part and the second conductive part being not in contact with each other, and the sensor system being configured to detect that an internal impedance of one sensor and an internal impedance of another sensor satisfy a predetermined condition.

Abstract: An object is to provide a sensor capable of operating on a self-sustaining power source. A sensor comprising a system, the system including: a first conductive part and a second conductive part; a medium; and a functional part, the first conductive part and the functional part being connected to each other, the second conductive part and the functional part being connected to each other, at least a part of the first conductive part and the second conductive part being in contact with the medium, and the first conductive part and the second conductive part being not in contact with each other, and the sensor being configured to detect that internal impedance of the system satisfies a predetermined condition.

Abstract: An object is to provide a system that can provide a stable power supply without being influenced by a time of day and weather conditions, and that is also superior in terms of power generation compared to conventional independent power supply type devices. A system comprising a first conductive part, a second conductive part, a medium, and a functional part, wherein the first conductive part and the functional part are connected, the second conductive part and the functional part are connected, at least a part of the first conductive part is in contact with the medium, at least a part of the second conductive part is in contact with the medium, and the first conductive part and the second conductive part are not in contact with each other.

Abstract: A writing implement suitable to be used by those with handicap in their hands and/or finger(s) comprising a grip having a terminal end having a curved surface adapted to contact with the palm of a user, the grip being formed such that the grip is held with the fingers and the palm in such a way that the grip is wrapped by the hand; and a pen point extending from a front end of the grip with a given angle. The grip can optionally have one or more concave contours adapted to fit the finger(s) of the user, wherein each concave contour can fit one or more fingers.