Abstract: An electron beam current modulator is provided between a cathode and a laser screen of a cathode-ray tube and has at least three deflecting plates positioned around, and symmetrically with respect to an optical axis of the cathode-ray tube and a diaphragm having an aperture of a regular shape. An electromagnetic control system is provided between the cathode and deflecting plates. A pickup senses position of the electron beam and produces a signal in case of an offset of the electron beam with respect to the optical axis. A video signal source is connected to a carrier generator having an output connected to an input of a phase shifter. The phase shifter has its outputs connected to the deflecting plates to rotate the cross-section of the electron beam in a plane drawn perpendicularly with respect to the optical axis. The apparatus has a control unit having an input connected to the pickup and an output connected to the electromagnetic control system.

Abstract: A method for making a laser screen for a cathode-ray tube involves forming a partly transparent mirror of a material resistant to etching solutions on a polished side of a semiconductor member to cover a part of the surface area of the polished side of the semiconductor member surrounding an image forming area. A layer of the semiconductor member of a thickness of 20 to 50 .mu.m is etched off on this polished side to define a support surface surrounding the image forming area which is equally spaced from the outer surface of the partly transparent mirror. A transparent support member is cemented to the outer surface of the partly transparent mirror. The other side of the semiconductor member opposite to the support member is polished, and a reflecting mirror is formed on this surface.

Abstract: A method for producing streptovaricin by culturing a streptovaricin producing strain in the presence of a nonionic adsorbent. This procedure substantially increases the production efficiency of the streptovaricin. A second embodiment wherein the streptovaricin producing strain is produced in the presence of fumaric acid or its water soluble salts to provide improvements in production efficiency is also disclosed.

Abstract: According to the method for preparing chitosan of the present invention, chitosan is prepared by inoculating a filamentous fungi belonging to the family Mucoraceae into a culture medium for pre-cultivation containing yeast extract, malt extract, peptone, glucose and magnesium sulfate to perform pre-cultivation and then inoculating the pre-culture into a culture medium for main-cultivation having a composition essentially identical to that of the medium for pre-cultivation to perform the main-cultivation. Particularly preferred filamentous fungi belonging to the family Mucoraceae is Absidia coerulea. According to the method for preparing chitosan through the cultivation of microorganisms, chitosan exhibiting uniform quality can efficiently be produced and the method does not adversely affect the circumferential environment.

Abstract: A method for producing streptovaricin by culturing a streptovaricin producing strain in the presence of a nonionic adsorbent. This procedure substantially increases the production efficiency of the streptovaricin. A second embodiment wherein the streptovaricin producing strain is produced in the presence of fumaric acid or its water soluble salts to provide improvements in production efficiency is also disclosed.

Abstract: A method of producing a brassinosteroid is disclosed, wherein crown gall cells capable of producing the brassinosteroid are cultured in a culture medium in the presence of a cultivation aid selected from auxins, sterols, squalene, casamino acid and mixtures thereof.

Abstract: There is disclosed a compound represented by the formula: ##STR1## wherein R.sub.1 represents a hydrogen atom or a lower alkyl group; R.sub.2 and R.sub.3 each independently represent a halogen atom or a lower alkyl group; R.sub.

Abstract: this invention relates to an alloy material for data storage of magneto-optical disk (ADSMO), as well as its manufacturing process. ADSMO is based on manganese, bismuth and doped with aluminum atoms and silicon atoms or by aluminum atoms and boron atoms. The above mentioned elements are deposited onto a transparent substrate in a certain sequence using an evaporation process or sputtering process, and then compact hexagonal cyrstalline structures are formed after being annealed in vacuum. ADSMO has a large magneto-optical Kerr rotation, a small size of crystal grains and a stable structure; its manufacturing process is easy and simple.

Abstract: In a method and device for the non-invasive acoustic testing of the elastty of soft biological tissues for the diagnosing of physiological and pathological state in humans and animals, tangential oscillatory deformations of the frequency range of 0.5-30 kHz are excited on the surface of a tissue, and a velocity of the excited surface wave propagating along the vector of the initial displacement is determined. The device includes a probe with one transmitting and two receiving piezotransducers equipped with contact tips and mounted to the body of the probe by elongated shafts which serve as acoustic delay lines, and an electronic device which forms pulses to excite the transmitting transducer, processes the received acoustic signals, measures the time-of-flight of acoustic pulses from the transmitting transducer to the receiving transducers, converts it into the velocity of surface wave and displays the value of the velocity.

Abstract: A novel transition-metal compound having a bis-substituted cyclopentadienyl ligand of bridged structure (I) and a novel mixture of the compound (I) with an aluminoxane (B), each useful as catalyst component(s) for stereoregular olefin polymerization are provided, which compound (I) is expressed by the formula ##STR1## wherein M is Zr or Hf; Y is Si or Ge; R.sup.1.sub.n -C.sub.5 H.sub.4-n and R.sup.1.sub.q -C.sub.5 H.sub.4-q each represent an unsubstituted or substituted cyclopentadienyl group; n and q each represent an integer of 0 to 4, but cases of n=q=0 and n=q=4 are excluded; R.sup.1 s may be same or different and each represent H, silyl or hydrocarbon radical; R.sup.2 s may be same or different and represent H or hydrocarbon radical; and Xs may be same or different and represent H, halogen or hydrocarbon radical; and which aluminoxane is expressed by the formula (II) or the formula (III) ##STR2## wherein m represents an integer of 4 to 30 and R.sup.3 represents a hydrocarbon radical.

Abstract: The present invention is a pyroelectric radiation detector using a polyvinylidene fluoride film (PVDF) as the sensitive material and having graphite in contact with one side of the film. The detector can have a planar or a conical cavity configuration. The sensitivity of this detector is in the range of 5 to 10 V/J, and the response time is shorter than 0.5 ms. This detector can be used to directly detect pulse laser radiation within a spectral range of 0.25 .mu.m to 25 .mu.m and having a power density as high as 100 MW/cm.sup.2. The detector is also suitable for other light radiations ranging from violet to infrared wavelength. It can be used, for example, as an infrared detector, as a radiation sensor for measuring temperature, as a detector for a standard radiation meter, and as a light trap for the equivalent black body absorption.

Abstract: Bis(di-, tri- or tetra-substituted-cyclopentadienyl)zirconium dihalides represented by the following general formula [I] are provided, ##STR1## (wherein R.sup.1 denotes a substituent group on the cyclopentadienyl ring which is an alkyl radical of 1 to 5 carbon atoms; R.sub.2.sup.1 --C.sub.5 H.sub.3 stands for a di-substituted cyclopentadienyl radical; and X is a halogen atom).This compound, when combined with an aluminoxane repesented by the following general formula [VII], gives a high-activity catalyst for the synthesis of polyolefins, ##STR2## (wherein m is an integer of 4 to 20; and R.sup.2 denotes a hydrocarbyl radical).

Abstract: A structure for decreasing low frequency air vibrations, comprising a sound insulating floor, sound insulating sidewalls and a sound absorbing ceiling arranged so as to form an air chamber below and separate from the underside of an elevated road or railway bridge's traversed surface, thereby forming a space between the sound absorbing ceiling and the elevated bridge. The structure is very effective for decreasing the low frequency air vibration emanating from the structure of the elevated bridge and the low frequency air vibrations transmitted from the structural supports of the elevated bridge.