Abstract: Invisible information are recorded in the form of pixels invisible to the naked eye and at a print density invisible to the naked eye.

Abstract: A printing method for use with a print system including a computer and a printer connected to the computer directly or by way of a network, the method including the steps of: directing the printer to effect printing and storage of a document prepared by the computer in an arbitrary combination of formats; transmitting the document to the printer; effecting receipt by the printer of the document transmitted from the computer; and effecting printing and storage of the document according to the instruction from the computer.

Abstract: A printing method for use with a print system including a computer and a printer connected to the computer directly or by way of a network, the method including the steps of: directing the printer to effect printing and storage of a document prepared by the computer in an arbitrary combination of formats; transmitting the document to the printer; effecting receipt by the printer of the document transmitted from the computer; and effecting printing and storage of the document according to the instruction from the computer.

Abstract: A centrifugal separator includes an input section for allowing a user to enter operating conditions of a centrifugal separation of a sample accommodated in a rotor driven by a motor. A memory of the centrifugal separator stores a user ID code and a corresponding user name which are registered in advance by the user. Operation of the centrifugal separator is allowed when a user ID code entered through the input section agrees with the registered user ID code.

Abstract: A printing method for use with a print system including a computer and a printer connected to the computer directly or by way of a network, the method including the steps of: directing the printer to effect printing and storage of a document prepared by the computer in an arbitrary combination of formats; transmitting the document to the printer; effecting receipt by the printer of the document transmitted from the computer; and effecting printing and storage of the document according to the instruction from the computer.

Abstract: Invisible information are recorded in the form of pixels invisible to the naked eye and at a print density invisible to the naked eye.

Abstract: A printing apparatus, which includes document data management unit 3 for receiving from a computer document data 5 to be printed and for storing and managing the document data 5, printing unit 1 for printing, on a predetermined sheet of paper, the document data 5 that is output by the document data management unit 3, and document sorting unit 2 for sorting and discharging, onto a sorting tray 22, the sheet of paper that is printed by the printing unit 1, includes: arrangement and editing unit 4 for each destination, for receiving and storing page data for each destination, for employing the page data to calculate a printing number required for each page of a document and for employing the sorting tray 22 for each destination, whereby a printed sheet of a necessary page is discharged onto the sorting tray 22.

Abstract: A fixed-angle rotor, having a centrifuge tube inclined at a predetermined gradient angle with respect to a rotational axis, is used to obtain a sedimentation coefficient of sample particles. In one method, a distance in the centrifugal direction is corrected by the gradient angle .theta. of centrifuge tube 1. Sedimentation coefficient S.sub.20,W is calculated based on the corrected distance, and then the sedimentation coefficient S.sub.20,W is multiplied with sin(.theta.) to obtain a corrected sedimentation coefficient. In another method, a distance in the centrifugal direction is corrected by the gradient angle .theta., and also an angular acceleration .omega..sup.2 is corrected by dividing it by sin(.theta.). And then, the sedimentation coefficient S.sub.20,W is calculated based on thus corrected distance and corrected angular acceleration.

Abstract: In an apparatus and a method for controlling centrifugal separator, simulation is performed, in Steps S1 to S4, for the process before and after change of parameters as centrifugation condition. The results are compared in Step S10, and operation of the centrifugal separator is controlled in Step S11. To obtain the measured data of the specimen, an attachment for analysis 15 is used, and the results are compared with the results of simulation, and parameters are corrected. To display the process in the middle of centrifugation, simulation is performed using the current parameters during operation of centrifugation, and the results are shown by graphic display on a display unit 2.

Abstract: A management system for use in a centrifuge equipped with a detachable rotor which is rotatable so as to separate density-different samples by a centrifugal force due to the rotation. The management system is for managing the lifetime of the rotor on the basis of the detection results of an operated-condition detector for detecting operated conditions such as the number of times of rotation, running time and rotational speed of the rotor. The management system includes a data storing device which is provided on the rotor to be rotatable therewith and is composed of a magnetic recording medium to allow keeping data relating to the operated conditions of the rotor. Also included in the management system is a data processing unit coupled through a data reading and writing device such as a magnetic head to the data keeping device and also coupled to the operated-condition detector to be responsive to the operated conditions.

Abstract: Disclosed is an ink droplet expelling apparatus for expelling an ink droplet in response to an electric signal, compising a printing head provided with one or more ink chambers, electro-mechanical transducers disposed on the printing head corresponding to the ink chambers, and a driving signal generating circuit for producing electric signals for driving the electro-mechanical transducers. The elector-mechanical transducers are distorted by three different driving signals to reduce the volumes of the ink chambers to raise the pressure therein to thereby expel an ink droplet out of a nozzle formed at the front end of the head.

Abstract: In a method for electrophotography comprising an electrostatic transfer process, after an electrostatic latent image formed on a surface of a photoconductive and photosensitive member has been developed with toner, the surface of the photoconductive and photosensitive member and a toner image are charged at the same polarity as the electrostatic latent image and thereafter the toner image is electrostatically transferred onto a recording medium to obtain a record.

Abstract: A nonimpact printer in which electric charges are distributed over the surface of an electrophotographic photosensitive drum by a corona charger, the corona charged surface of the drum is exposed to a first information light, the induced latent image is developed by toner of a first color, the corona charged surface of the drum with the developed image of the toner of the first color is again exposed to a second information light, and the secondly induced latent image is developed by toner of a second color, so that a bicolor toner image is formed on the surface of the drum, which is transferred on a printing medium to obtain a print.

Abstract: An electrostatic photographic method for reversal development using a magnetic brush, with the magnetic brush and photoconductive drum being grounded, and with the development being performed using a dry reversal developer comprising 100 parts by weight of a carrier having ferromagnetic properties and 1 to 10 parts by weight of a toner having a volume specific resistance falling within the range between 3.5.times.10.sup.9 and 1.times.10.sup.11 .OMEGA.-cm.

Abstract: A thermomagnetic recording apparatus, for example, facsimile receiver wherein the surface of a magnetic drum which is uniformly coated with a magnetic material is uniformly magnetized, the magnetized surface is locally heated to a temperature of at least a Curie point in accordance with facsimile signals by means of a thermal recording head, to reduce the coercise force and to invert the polarity of the magnetization, thereby forming a magnetic latent image, and the magnetic latent image is developed with magnetic toner.