Abstract: Boron-aluminum nitride B.sub.x Al.sub.1-x N.sub.y (0.001.ltoreq.x.ltoreq.0.70, 0.85.ltoreq.y.ltoreq.1.05) films having wurtzite type structure are proposed. The material has higher hardness, higher sound velocity and wider band gap than hexagonal aluminum nitride (AlN).

Abstract: In a nuclear magnetic resonance spectrometer, this invention relates to an improvement of a lock system for stabilizing a magnetic field intensity. It is an object of the present invention to dissolve a low stability by using a conventional voltage control oscillator and a complex operation in the case of varying a reference material for locking. In the present invention, a radio frequency of a high stable reference frequency source is demultiplied by a variable frequency divider so that a frequency modulation or a modulation of the magnetic field is effected by the output thus demultiplied. When the reference material is changed, the operation can easily be made by varying the demultiplication ratio of the variable frequency divider.

Abstract: A sample is bidimensionally scanned with an electron beam to display an image of the sample based on a secondary-electron signal generated from the sample. Two marks corresponding to two points on the sample are displayed in superposition to the image and a distance between the two points on the sample is calculated based on coordinates of the marks and a tilting angle of the sample to the electron beam.

Abstract: A non-magnetic metal for integral casting is poured into a mold supporting a couple of magnetic pole pieces with a distance piece placed therebetween. The pole pieces are thus fixed as cast integrally with the mold, and subsequently the distance piece is removed so that there are provided magnetic pole pieces of the type best suited to a nuclear magnetic resonance apparatus, etc.

Abstract: Continuous high-frequency waves and pulse-like high-frequency waves of the same frequency are selectively applied to a specimen placed in a unidirectional magnetic field, whereby resonance signals and free induction decay signals are selectively produced by the specimen. These signals are detected, and the detected free induction decay signals are Fourier-transformed, so that the continuous wave nuclear gyromagnetic resonance and the Fourier-transformed nuclear gyromagnetic resonance can be selectively measured.

Abstract: A uniform magnetic field generating device for generating a uniform magnetic field such as that required in a nuclear magnetic resonance device is disclosed. In prior art devices, in order to obtain a highly uniform magnetic field space, a parallel gap has been formed between pole pieces which were magnetically homogenized and mounted on magnets coupled by a yoke. In place of such pole pieces, a magnetically homogenized pole block or a pole block sandwiched by pole pieces is inserted between the magnets and a cylindrical hole or space is formed in the pole block, a sectional area of the space taken in parallel with the direction of a magnetic field due to the magnets and perpendicular to the axial line of the space being of circular, ellipse or rectangular shape, whereby a highly uniform magnetic field space is established.

Abstract: The nuclear resonance signal obtained from the sample is stored in a memory circuit and the stored signal is then repeatedly read out. A periodic function which is derived as a result of the transformation of a triangular wave into a trapezoidal one, is used for the Fourier transformation of the repeatedly read-out signal. The adverse influence of the transient phenomenon in the h-f impulse signal on the resultant spectrum is eliminated by stopping the Fourier transformation only during the initial portion of the read-out period of the memory circuit.