Abstract: A vibrating apparatus for vibrating a mold 1 by an electrohydraulic stepping cylinder 5 through a link mechanism 3 is characterized in that when a driving signal delivered into a drive unit 26 for the stepping cylinder 5, the actual acceleration of the mold 1 is fed back to a target waveform signal for the mold 1 and compensating signals for cancelling the operation delay of the stepping cylinder 5 and the signal transfer lag due to elastic deformation of the link mechanism and the like are added thereto to make feed-forward compensation.

Abstract: Coatings of hydrophilic organic polymers such as polyvinyl alcohol are grafted to substrates formed from hydrophobic organic polymers and polyorganosiloxanes by exposing the surface of the substrate to an aqueous solution of the hydrophilic poller in the presence of a solubilized compound of tetravalent cerium that preferably contains hydroxyl or amino groups as ligands.

Abstract: Each of a pair of magnetic core halves includes a substrate and a thin magnetic metal film formed on the substrate. The substrate is notched with a winding groove. The pair of the magnetic core halves are integrally bonded to each other so that a gap filling film is formed between the facing surfaces of the thin magnetic metal films. The zero depth position of the magnetic gap which is determined by the length of the facing thin magnetic metal films is offset to a magnetic recording medium sliding surface of the magnetic head from the notching start position of the winding groove on the side of the magnetic gap. Hence, the shape of the thin magnetic metal film exposed on the magnetic recording medium sliding surface is maintained constant from the initial position to the depth zero position.

Abstract: A catheter is provided which can be safely implanted in the living body for extended periods of time. At least that portion of the catheter which contacts the tissue comprises a cuff of porous material which is made of a vinyl alcohol polymer to which, preferably, collagen has been chemically grafted.

Abstract: This invention discloses a high pressure sodium vapor lamp having unsaturated vapor pressure type characteristics with sodium and mercury contained in an arc tube. The sodium is enclosed in an amount sufficient to exhibit unsaturated vapor pressure type characteristics while the mercury is enclosed in an amount M.sub.Hg calculated by the following formula: ##EQU1## where M.sub.Hg : the amount of mercury enclosed (mg)D: the internal diameter of the arc tube (cm)L: the electrode-to-electrode distance (cm)V.sub.olume : the volume of the arc tube (cc)V.sub.n : the rated lamp voltage (Volt).

Abstract: There is provided an oral composition containing a hydroxamic acid represented by the formula R--CH.sub.2 --CO--NHOH (where R is an alkyl group or alkoxyphenyl group) or a salt thereof such as 2-(4-butoxyphenyl)acetohydroxamic acid, 2-(4-methoxyphenyl)acetohydroxamic acid, caprylohydroxamic acid, or laurohydroxamic acid. The oral composition prevents Streptococcus mutans from colonizing in the oral cavity and is effective in preventing dental caries and also in preventing and remedying periodontal disease.

Abstract: An a.c. arc welder includes a reactor between a source of a.c. power and a welding load for accumulating energy during the increase of voltage from the source. A bypass circuit is further provided in parallel to the reactor and the welding load for dissipating the accumulated energy as a welding current through the load.

Abstract: A method and apparatus for controlling the welding current in shortcircuit transfer arc welding including a method and control apparatus for maintaining the effective value of the welding current during arcing period at a predetermined value. Maintenance of the effective value of welding current during arcing period is necessary to keep the size of a fusion zone and the depth of penetration constant throughout welding operation.

Abstract: An AC arc welder which comprises means for detecting the welding current, a comparison circuit for generating logical output signals by comparing the output voltage or output current of the welding current detecting means with the reference voltage or reference current from a reference voltage generating means, digital means for generating logical output signals by performing adding operation or subtracting operation in response to the logical output signal, current supplying means for supplying the output current whose common ratio becoming the geometrical series of approximately m(m = 1, 2, 3 . . . ), and switching means for on and off- controlling the output of the current supplying means in response to the logical output signals of the digital means, thus forming a current feedback loop, whereby the output current from the current supplying means can be changed minutely, thus ensuring stabilized control characteristics.