Abstract: Circuitry allocates requests for demand-shared bus access among a plurality of service requesting ports. During bus contention time, each requesting port synchronously and sequentially applies the digits of its assigned unique priority code to the bus beginning with the most significant digit. After the application of all digits, only the requesting port having the highest code remains in contention and it seizes the bus. Increased flexibility in port preference is provided by the use of a plurality of status flip-flops in each port for generating dynamic port parameter bits. The generated parameter bits are normally applied to the bus as the most significant bits of a dynamic port priority code during contention time. However, the selective application of a mask signal to a mask conductor during contention time causes each requesting port to prevent any parameter bits from being applied to the bus as long as the mask signal remains. This returns control of the port preference to any unmasked parameter bits and to the assigned port priority codes.

Abstract: Circuitry is disclosed for allocating requests for demand-sharing bus access among a plurality of service requesting ports. During bus contention time, each requesting port synchronously and sequentially applies the digits of its assigned unique priority code to the bus beginning with the most significant digit. After the application of all digits, only the requesting port having the highest code remains in contention and it seizes the bus. The present invention provides flexibility in port preference by the use of a plurality of status flip-flops in each port for generating dynamic port parameter bits. The generated parameter bits are normally applied to the bus as the most significant bits of a dynamic port priority code during contention time. The state of the status flip-flops is controlled by circuitry which counts the number of packets of a specified size currently stored in the buffer memory of each port. This gives preference to the port whose memory contains the largest number of packets of the specified size. For a PBX, this permits short packets containing time sensitive system control messages to be given preference over longer packets containing relatively non-sensitive customer provided business information such as word processing files.

Abstract: The author carried out a study of the coinage of Aksum when a research student of the British Institute. Here he examines the history of the main port of the kingdom.

Abstract: Wind-energy converters which are used in the offshore sector and which are mounted on a floating platform. The platform is equipped with more than one wind-energy converter and is designed so that the converters can be towed into a repair yard in port for repair, maintenance, etc. The platform is accordingly of modular construction, the individual modules being exchangeable, and for the wind-energy converters there are respective platform segments which are also interchangeable. Both vertical and horizontal converters can be employed.

Abstract: This paper demonstrates the validity of relative shift technique toward aiding the port geographer/planner in decision-making. The technique can be applied with a minimal of effort and yield diagnostic information concerning port commodity flows. A broad overview of New England's port facilities is presented, and the technique is then applied to an individual port, Boston.

Abstract: In a fiber optic (FO) bus distribution system having a plurality of subscriber stations, a plurality of first star couplers coupled to said FO bus each with first and second input ports and a first output port, a plurality of second star couplers coupled to the FO bus each having a first input port and first and second output ports, at least one signal repeater connected between the first output port of the second star coupler and the first input port of the first star coupler and having a delay time Δ. Also provided is a fiber optic cable connected between the second output port of the second star coupler and the second input port of the first star coupler and having a delay time δ, where δ is substantially equal to Δ.

Abstract: Summary Botany Bay, the site of Captain Cook's first landfall, is currently being developed for seaport and industrial purposes. The specialized facilities and installations constructed on both the northern and southern foreshores of the Bay deal with bulk cargoes, crude oil, chemicals and petroleum products; the northern foreshores also provide specialized wharfage for the overseas container trade on a large scale. This specialized wharfage supplements earlier twentieth‐century constructions in the Port of Sydney and extends the scale of the modern Botany Bay seaport‐industrial complex which has been developed from the 1950s. It is intended that the entire project will be completed by the year 2000. When the new port development and industrial complex is fully realized, the Sydney region could well experience a further era of massive urban growth and construction. This would be accompanied by concomitant intensification and change of land‐uses in the Botany Region itself. It is suggested that the measure...

Abstract: A telephone switching system for telephone trunk and subscriber lines that carry voice and associated supervisory information signals. The voice signals are received through one of a plurality of ports under the control of a port event processor, and are transferred through a switching arrangement under the control of a call processor for transmission through a second port. The supervisory information is received with the associated voice signals, and is sampled and stored in a port data store memory. The call processor can retrieve or modify the supervisory information stored in the port data memory store, and can store control information in the port data store. The port event processor enables the transfer of certain supervisory information from the port data store for transmission with the associated voice signals to the respective port. The port event processor also performs certain operations specified by the commands and supervisory information stored in the port data store memory. The port event processor and port data store memory both operate under control of timing signals from a timing signal generator. The timing generator generates timing signals of two frequencies. The port data store memory samples the sense supervisory information signals at a rate dependent upon the higher frequency timing signal, and the port event processor controls the operation of the respective ports in response to the lower frequency timing signal.

Abstract: A central office telephone switching system including two interactive processors, including a call control processor that controls calls by establishing sequences of call progression states, and a port event processor that controls the ports and transmits and receives supervisory information to and from the ports. The port event processor and call control processor communicate through a port data store. The port event processor transfers the received supervisory information to the port data store, for use by the call control processor. The port event processor includes a digital filter that periodically time-samples the received supervisory information and determines the proper state of the received supervisory signal based on the states of the majority of the received sample signals.

Abstract: (1982). The Last Wave from Port Chicago. The Black Scholar: Vol. 13, The Port Chicago Disaster: Was it a Nuclear Explosion?, pp. 30-47.

Abstract: PURPOSE:To speed up continuous access by enabling the access on some condition even when a main storage device is in a busy state as a result of store access to a memory bank in the main storage device. CONSTITUTION:A discrimination partIfor a port A discriminates whether specific conditions are satisfied when an access request is sent from a vector unit port B while a vector unit is sending another access request from the port A to a main storage controller. Only when precedent access is effective store access and the destination of the precedent access and that of the access from the vector unit port B indicate the same bank, a control signal is gener- ated to permit another request from the vector unit port B.

Abstract: PURPOSE:To speed up continuous access by enabling the access on some condition even when a main storage device is in a busy state as a result of partial storage in a memory bank in the main storage device. CONSTITUTION:A discrimination partIfor a port A has shift registers 1-3, a comparing circuit 5, and an NOR circuit 6. The register 1 has a bank number 1-0 and a valid flag 1-1; the number of a bank at an access destination is entered in the bank number 1-0, and access to the bank with the bank number is entered into the valid flag 1-1. The comparing circuit 4 compares the bank number of the register 3 with the bank number of the access destination transferred to a port B. When an access request is sent from the port A while an- other access request is sent by a vector unit to a main storage controller MCU, a discrimination part II for the port B generates a control signal for permitting the access request on the same conditions with the discrimination partIfor the port A.

Abstract: This report presents the results of an evaluation of the short-term effects of implementing new public transportation systems in Kerrville, Port Arthur and Midland, Texas. Major emphasis was placed on identifying the personal and travel characteristics of those groups of individuals which use the transit services on a regular basis. In addition, the effects of the new transit systems on energy conservation, traffic congestion and the demand for parking were also identified, as were the effects on retail establishments and other providers of transportation services. Input from community leaders and the general public was also sought on the effects of the new transit systems. Finally, a set of generalized guidelines for use in planning and implementing new public transportation systems in other small Texas cities was developed based on the experiences in Kerrville, Port Arthur and Midland.

Abstract: South Georgia, at present governed as a Dependency of the Falkland Islands, has an interesting history of human activity extending back nearly two centuries. The sealers who visited the island in considerable numbers in the 18th and 19th centuries (Jones, 1973) almost certainly left gangs of men on the island for considerable periods, but not until the 20th century were permanent settlements established there. Published accounts of the initial stages of this colonisation (Matthews, 1931; Christie, 1951) contain various important errors, and give only the simplest outline of an interesting political problem. A more accurate account of some of these events has recently been published (Tonnessen and Johnsen, 1982). Material preserved in the Falkland Islands Government's (FIG) archives at Port Stanley has allowed a detailed account to be built up of this important period of South Georgia's history.

Abstract: A dual brake valve assembly for use in fluid pressure-operated vehicle braking systems embodying two independent braking circuits comprises a housing (1) provided with sets of primary and secondary ports associated respectively with the two braking circuits and each consisting of a supply port (5, 6) for connection to a source of fluid under pressure and a delivery port (7, 8) for connection to a brake actuator, an exhaust, and two co-axial primary and secondary valves (11, 12) which are operative, when actuated, to isolate the delivery ports from the exhaust and connect them to the respective supply ports. A primary piston (9) operates the primary valve (11) directly and acts on a secondary piston (10) to operate the secondary valve (12). The exhaust comprises a radial exhaust port (30) in the wall of the housing (1) intermediate opposite ends thereof, and the secondary piston (12) is provided with an exhaust passage (21) which is in communication at all times with the exhaust sides of both the primary and secondary valves (11, 12), and with the exhaust port (30) irrespective of the axial position of the secondary piston (10) in the housing (10).

Abstract: A telephony switching system for interconnecting a plurality of telephone lines. A port storage circuit dedicates an area to each telephone line for storing status information including supervisory information and dial digit information for the corresponding telephone. A port event processor monitors incoming supervisory information from each port means connected to each telephone line to update the corresponding information in each area of the port storage circuit. Upon the occurrence of predetermined events, such as the receipt of all the digits in a telephone number, the port event processor produces an event code that is also stored in the port storage area. A call processor scans all the port storage areas to establish, for each port means, a progression of call states in response to the event information and other information in the port storage circuit and to update control information in the corresponding area. The port event processor transmits control supervisory information to each port means in response to information in the corresponding port storage area. During digit dialing operations, each port store area accumulates all the digits for the corresponding telephone and corresponding locations whereby the port storage means can accumulate digits from all the telephone lines.

Abstract: In this paper, the authors outline the structure of liner shipping systems with special emphasis on the question of whether feeder services are superior in economic terms to the more traditional and commonly-used multi-port-calling system. They describe the theoretical advantages of the former over the latter, and develop a model by which the optimal conditions both operate in may be determined. This model is then applied to a real situation to ascertain whether the theory works in practice. They conclude that the shuuttle/feeder system is worthwhile only in exceptional circumstances when specific route characteristics—low trade density; hinterland generated cargo; inland position of port; and heavy congestion—coexist. Despite the expense of multi-port-calling, it remains the most practical solution to the thin trade problem.

Abstract: PURPOSE:To control the amount of displacement of the piston by changing only the port of a valve plate by a method wherein at least one of ports provided on the valve plate is provided with a closed part, whose width is same as the same of the port, about a position apart from a lower dead point by a desired angle. CONSTITUTION:The place between the end part 21a of the first port 21 and the end part 22b' of the second port 22' as well as the place betweeen the end part 22b of the second port 22 and the same 21a' of the first port 21' have closed part H1, H1', having widths W1, W1' equal to the width W of the port, about the lower dead point a1 and the upper dead point a1', and the place between the end part 21b of the first port 21 and the same 22a of the second port 22 has a closed part H2, having the width W2 same as the same W of the port substantially, about the position a2 apart from the lower dead point a1 by an angle alpha, while the place between the end part 21b' of the first port 21' and the same 22a' of the second port 22' has the closed part H2', whose width W2' is same as the width W of the port substantially, at the position a2' symmetrical with respect to said position a2 against the center o thereof in the same manner.