Abstract: A control system for synchronizing the rotation of the recording discs of a plurality of disc drives so that the read/write heads of all of the drives will be at the same relative position on the rotating discs thereby reducing the latentcy time in switching between disc drives.

Abstract: ASPOL (A Simulation Process - Oriented Language) is a simulation language developed specifically for computer system simulation. Its process control and synchronization facilities derive from, and function similiarly to, those developed in the designs of computer operating systems. Consequently, ASPOL provides a natural vehicle for simulating such systems. Other important features of ASPOL include facilities for defining and operating on sets of entities, thus simplifying the modeling of parallel systems (multiprocessors, multiple disk drives, etc.), and macro facilities, which provide language extensibility.This paper describes the ASPOL simulation constructs—processes, events, facilities, and storages—and then illustrates their use in a simple model of a time-sharing system with a paged memory. The ASPOL macro facilities then are described in brief, and a simple example of how they may be used to construct a higher-level computer simulation language is given.

Abstract: A frame synchronizer for use in a digital multiplexing system is disclosed which uses a pseudo random (PN) sequence generator to generate a frame word in the demultiplexer which is similar to the frame word generated in the multiplexer. The input data is compared with the output of the PN sequence generator to determine the presence of synchronization. Parallel upshift registers in which the input data is stored are used to initialize the demultiplexer PN sequence generator; thus programming that generator by the data so as to obtain more rapid frame synchronization.

Abstract: A method and system for simulating the real-time dynamic operation of a full scope nuclear powered electrical generating plant for operator training utilizing apparatus that includes a control console with plant component control devices and indicating devices for monitoring plant operation. A general purpose digital computer calculates the dynamic simulation data for operating the indicating devices in accordance with the operation of the control devices. The functions for synchronization and calculation are arranged in a priority structure so as to insure an execution order that provides a maximum overlap of data exchange and simulation calculations. Such an arrangement also provides for the completion of all data interchange and calculations during each repetitive calculation cycle.

Abstract: Samples of pooled cervical mucus from groups of animals fed melengestrol acetate (MGA) for 14 days were taken 3 and 4 days after cessation of treatment. The mucus samples were separated into protein and glycoprotein portions and the epithelial glycoprotein was isolated. The protein fraction was examined by disc electrophoresis and the epithelial glycoprotein was characterized by chemical analysis and determination of the molecular weight. The cervical mucus of one of the treated groups yielded a glycoprotein which had a reduced sulphate content when compared with that of the controls and did not show the lowered neuraminic acid content characteristic of the glycoprotein from untreated animals at oestrus. Two other groups of MGA-treated animals which received HCG 3 days after withdrawal of the progestagen did not show these anomalies. The protein in the MGA-treated samples of mucus contained con¬ siderably larger amounts of material migrating in the transferrin region of the electrophoretogram than did comparable controls.

Abstract: Summary Between March and August 1968 to 1970, Chlormadinone acetate (CAP), 10 mg/head/ day, was administered to 668 Zebu cows and heifers for oestrous cycle synchronization for 14, 12, or 9 days, the latter schedule supported by an injection of 5 mg estradiol valerate on day 2 to achieve luteolysis. Applied orally over a period of 14 days, CAP provided a reliable method for cycle synchronization. The severe anoestrous rate experienced in all herds reduced the overall percentage of synchronized animals. Fertility from insemination during the first synchronization period (day 2 to 10 after treatment) was slightly, yet insignificantly reduced, but was completely restored during the second synchronization period (day 20–30). Insemination only during this second synchronization period resulted in conception and pregnancy rates similar to those combined from the first and second synchronization period. Of factors tested for influencing synchronization and fertility, presence or absence of penis-deviated teaser bulls (psycho-stimulation) had no effect on the percentage of animals synchronized, or on post-treatment fertility. In well-managed herds, the percentage of animals responding to treatment was predetermined by the number of animals already cycling, reflecting their phase of reproductive life. Levels of management had an important impact on the success of cycle synchronization combined with artificial insemination. Both methods are managerial tools for improvement of already good management. Their failure under insufficient management conditions has diagnostic value. Possibilities and limits shown for oestrous cycle synchronization in Zebu cattle were similar to those reported in European cattle. Within these limits, CAP can be employed successfully as a means for cycle synchronization, providing sufficient synchronization and acceptable fertility and allowing economical use of artificial insemination.

Abstract: From 13th Hanford biology symposium on the cell cycle in malignancy and immunity; Richland, Washington, USA (1 Oct Many reports have shown that hydroxyurea, in vivo, can cause partial synchronization of proliferating cells in both normal and malignant tissue. Theoretically, clinical use for such agents could be rewarding. This report reviews the murine data within cality of cell synchronization in cancer therapy. (LMT)

Abstract: A manikin synchronization system is described to cause recorded aural sounds to be coincident with mechanical motions including the effects of the breathing cycles. The synchronization system interfaces with the mechanical and audio systems in order to bring heart sounds, breathing cycles and mechanical motions into time coincidence. The synchronizing system accepts pulses from a mechanical master timing shaft which indicates the mid-points of the breathing cycles. These pulses are applied to the synchronization system which, in response to additional synchronization information on an audio tape, indicates whether the audio signal is early or late with respect to the mechanical system. Accordingly, a voltage controlled oscillator produces an output proportional to the indication to control the tape drive and create synchronization of the audio and mechanical systems.

Abstract: This paper presents the interprocess communication/synchronization scheme used in the SUE operating system. This scheme is based on a tree structure of processes which are called “facilities” and three primitive operations: Facility Call, Accept Facility Call, and Complete Facility Call. These primitives are implemented by a small “Kernel” which is the basis of the operating system.

Abstract: A metal-oxide-semiconductor (MOS) random-access-memory array which utilizes dynamic memory cells is disclosed. All the cells in the array are simultaneously refreshed upon the application of a single external refresh signal. The array does not require synchronization of the refresh signal and memory access signal.

Abstract: A system is described that avoids false synchronization of the trigger on signals arriving while the hold-off circuit is resetting, thus preventing the apparent shifting of displayed waveforms. The effectiveness of the system is illustrated by results obtained with different oscilloscopes and signals.

Abstract: An overview of the structured data types proposed for the grok language is given. The proposal represents a uniform approach to arrays, records and procedures by regarding them as specialized occurences of the same underlying structure. Structures are partitioned into three classes according to the number of references pointing to the structure at the same time, and we show how this may be utilised in synchronization of parallel processes. The well known producer-consumer example illustrates this.

Abstract: The Defense Communication System will be moving rapidly toward providing switched digital service to it's users within the next ten years. The principal driving force in the transition to a digital system is the requirement for high performance secure voice service. Additionally, the anticipated data requirements in this time frame can be handled most effectively by a digital network. The characteristics of a switched digital network which impose timing and synchronization requirements on the system design are presented. Several alternative approaches to implementing a timing subsystem suitable for a switched digital communications system have been considered. These include pulse stuffing, independent stable clocks, and clock correction techniques. The advantages and disadvantages of each approach are discussed relative to both the strategic and tactical communication system requirements.

Abstract: Summary A synchronization method in L-cells producing nutritive stagnation of the cells in G 1 is presented. After reinnoculation, cells proceed through the cycle in the normal 24 hours. The method has the advantage that no chemical blockers are added to the system and a large number of cells is obtained. In a comparison with other synchronizing systems, this system rates in the foreground. Desynchronization due to individual cell physiologies makes investigations of G 2 difficult with this system. The method is uncomplicated and probably applicable to similar cell types.