Abstract: Provided is an AD converter that is capable of converting a wideband noise signal of several GHz or more into a digital signal and that can be used even when an installation space and power supply are severely limited. The AD converter includes: a comparator (10) configured to compare an input voltage of an analog signal to a determination voltage; an adjustment unit (12) configured to shift at least one of the input voltage of the analog signal or the determination voltage; an encoder (11) configured to output time-series data of one bit based on a result of the comparison obtained by the comparator; a processing unit (13) configured to calculate a frequency of appearance of an output code included in the time-series data; and a control unit (14) configured to cause the adjustment unit to operate so that a result of the calculation obtained by the processing unit becomes a predetermined value.

Abstract: Provided is an AD converter that is capable of converting a wideband noise signal of several GHz or more into a digital signal and that can be used even when an installation space and power supply are severely limited. The AD converter includes: a comparator (10) configured to compare an input voltage of an analog signal to a determination voltage; an adjustment unit (12) configured to shift at least one of the input voltage of the analog signal or the determination voltage; an encoder (11) configured to output time-series data of one bit based on a result of the comparison obtained by the comparator; a processing unit (13) configured to calculate a frequency of appearance of an output code included in the time-series data; and a control unit (14) configured to cause the adjustment unit to operate so that a result of the calculation obtained by the processing unit becomes a predetermined value.

Abstract: A tube 12 made of stainless steel is arranged in a thermal bath 13 and an AC current is supplied to the tube to apply an AC heat directly to the tube and a liquid sample contained therein. An AC temperature of the tube 12 is detected by a thermocouple 19. An amplitude of the AC heat, and a phase difference between the AC heat and the AC temperature are detected. The above measurement is performed for the vacant tube, the standard liquid sample containing tube and the liquid sample containing tube to derive amplitudes .DELTA.T.sub.c, .DELTA.T.sub.r and .DELTA.T.sub.s and phase differences .phi..sub.c, .phi..sub.r and .phi..sub.s. Then, a heat capacity .rho..sub.s .multidot.C.sub.s per a unit volume of the liquid sample is calculated from a following equation.rho..sub.s .multidot.C.sub.s =[{sin (.phi..sub.s)/.DELTA.T.sub.s -sin (.phi..sub.c)/.DELTA.T.sub.c }/{sin (.phi..sub.r)/.DELTA.T.sub.r -sin (.phi..sub.c)/.DELTA.T.sub.c }].rho..sub.rwherein C.sub.r and .rho..sub.

Abstract: A method for molding a thermosetting resin pipe having a balanced compressive strength between the axial direction and the direction normal to the pipe axis is disclosed. The method includes steps of molding a thermosetting resin in a smooth zone in the front section of a screw to such an extent that the resin after being extruded from the cylinder is capable of retaining its own shape, and orienting the resin and/or a fibrous filler randomly. An apparatus for producing such a thermosetting resin, and a thermosetting resin having a balanced compressive strength are also disclosed.

Abstract: A copolymer consisting of 30 to 65 mole % of structural units of the formula ##STR1## 1 to 55 mole % of structural units of the formula ##STR2## and 10 to 60 mole % of structural units of the formula ##STR3## and having a number average molecular weight of 500 to 200,000.

Abstract: Phenolic resin compositions comprising a polymeric substance having a phenolic OH group such as phenol resins, and a rubber having an epoxy group and an epoxy equivalent of 500 to 30,000 such as butadiene copolymers, acrylic copolymers, chloroprene copolymers and urethane copolymers are provided. These resin compositions exhibit improved properties having overcome the drawback of brittle properties intrinsic of conventional phenolic resins, and also exhibit cold resistance; hence they are used as molding materials, laminating materials, casting materials, binders, etc. Further, molding resin compositions having improved solvent-resistance and metal insert properties are provided.

Abstract: Phenolic resin compositions comprising a polymeric substance having a phenolic OH group such as phenol resins, and a rubber having an epoxy group and an epoxy equivalent of 500 to 30,000 such as butadiene copolymers, acrylic copolymers, chloroprene copolymers and urethane copolymers are provided. These resin compositions exhibit improved properties having overcome the drawback of brittle properties intrinsic of conventional phenolic resins, and also exhibit cold resistance; hence they are used as molding materials, laminating materials, casting materials, binders, etc. Further, molding resin compositions having improved solvent-resistance and metal insert properties are provided.