Abstract: A resonance shear measurement device (1) of the present invention includes an upper unit (10) having a piezoelectric element (15), an upper disk substrate (16), and a spring (17), and a lower unit (11) having a lower disk substrate (14), in which a sample insertion portion (21) is formed between a lower surface of the upper disk substrate (16) and an upper surface of the lower disk substrate (14), the piezoelectric element (15) and the upper disk substrate (16) are vibratably connected to a fixed apparatus 30 via the spring (17), a strain gauge (19) is attached to the spring (17), and by applying an AC voltage to the piezoelectric element (15) while changing a frequency of the AC voltage, a response voltage at the resonance from the strain gauge (19) due to a vibration of the upper unit (10) is measured.

Abstract: There are provided a viscometer that can accurately measure a bulk viscosity of a small amount of a liquid sample such as 100 ?L or less, and a method for measuring viscosity. A viscometer (1) comprises a fixing member (31), an upper unit (10), a lower unit (11), and an information processing unit (50). A method for measuring viscosity comprises measuring a viscosity of the sample by measuring a response voltage during resonance from a detecting means (19) that detects displacement of a leaf spring (17) in one direction due to vibration of the upper unit (10) through applying an AC voltage to a piezoelectric element (15) while changing a frequency by the information processing unit (50).

Abstract: There are provided a viscometer that can accurately measure a bulk viscosity of a small amount of a liquid sample such as 100 ?L or less, and a method for measuring viscosity. A viscometer (1) comprises a fixing member (31), an upper unit (10), a lower unit (11), and an information processing unit (50). A method for measuring viscosity comprises measuring a viscosity of the sample by measuring a response voltage during resonance from a detecting means (19) that detects displacement of a leaf spring (17) in one direction due to vibration of the upper unit (10) through applying an AC voltage to a piezoelectric element (15) while changing a frequency by the information processing unit (50).

Abstract: A resonance shear measurement device (1) of the present invention includes an upper unit (10) having a piezoelectric element (15), an upper disk substrate (16), and a spring (17), and a lower unit (11) having a lower disk substrate (14), in which a sample insertion portion (21) is formed between a lower surface of the upper disk substrate (16) and an upper surface of the lower disk substrate (14), the piezoelectric element (15) and the upper disk substrate (16) are vibratably connected to a fixed apparatus 30 via the spring (17), a strain gauge (19) is attached to the spring (17), and by applying an AC voltage to the piezoelectric element (15) while changing a frequency of the AC voltage, a response voltage at the resonance from the strain gauge (19) due to a vibration of the upper unit (10) is measured.

Abstract: Provided is a cast iron material from which excellent friction characteristics can be obtained. Provided is the cast iron material containing C and Fe as a composition, and further containing Cr as the composition in 1.0 to 3.5% in terms of mass %. The cast iron material is used in a sliding component sliding under an environment of lubricating oil to which an additive containing Mo as a constituent element, such as MoDTC, is added. Cr contained in the cast iron material promotes a decomposition reaction of the additive containing Mo added to the lubricating oil to form a film of molybdenum disulfide, the film having low friction. Thus, the fiction can be reduced.

Abstract: The invention provides an SRT material (lubricant) applicable to machine elements such as bearings, seals or guides (guiding mechanisms) that constitute a slide part of a machine. A lubricant and an SRT material are disclosed.

Abstract: A resonance shear measuring method capable of simple and rapid measurement by obtaining a resonance shear curve through Fourier transformation of a damping curve of an oscillation on one side surface of a sample during measurement of shear response from the sample is provided.

Abstract: A resonance shear measuring method capable of simple and rapid measurement by obtaining a resonance shear curve through Fourier transformation of a damping curve of an oscillation on one side surface of a sample during measurement of shear response from the sample is provided.

Abstract: A precise shear-stress measurement apparatus includes a spring disposed perpendicularly to a sample surface, and a cylindrical piezoelectric element disposed perpendicularly to the sample surface and connected to the spring. The piezoelectric element is circumferentially divided into a plurality of pieces. The apparatus further includes a circuit for driving the piezoelectric element, a capacitance-type displacement gauge for detecting a horizontal displacement of the spring, and a battery for driving the displacement gauge. This reduces noise from an electric system, thereby making it possible to precisely measure even rheology motion in a very small space on the order of nanometers.