TL;DR: In this paper, a community office switching system includes a three-level hierarchy of distributed processors operating in parallel with one another to control the operation of a central office matrix switch network interconnecting 1,920 ports.
Abstract: A community office switching system includes a three-level hierarchy of distributed processors operating in parallel with one another to control the operation of a central office matrix switch network interconnecting 1,920 ports. At the highest level, a stored-program call control processor controls call progression, establishing paths through the matrix switch network. At the second level, a series of special-purpose, stored-program, port control processors each service 960 ports, sensing and transmitting supervisory signals and communicating the occurrence of significant port events to the call control processor. Each port event control processor dedicates approximately 32 microseconds out of every 32 milliseconds to each of the 960 ports in time-multiplexed fashion, and hence no port can ever be locked out at the port-control-processor level. One from a series of stored programs is executed to service each port precisely one every 32 milliseconds. At the lowest level, a digital filtering processor, associated with each port control processor, samples some signals from each port once every millisecond, filters the sampled signals to give one filtered sample every four milliseconds, and stores the filtered samples for presentation to the associated port control processor once every 32 milliseconds.
TL;DR: In this article, the authors reflect the varying attitudes and experiences associated with the industrialization of large urbanized maritime zones, particularly concerning port-city interrelationships and the role of cityports in regional development.
Abstract: Cityport industrialization and Regional Development reflects the varying attitudes and experiences associated with the industrialization of large urbanized maritime zones, particularly concerning port-city interrelationships and the role of cityports in regional development Contents: Seaports, Cities and Transport Systems; Industrial Port Areas and the Kondratieff Cycle; Maritime Regional Development; Free Ports, Free Trade Zones, Export Processing Zones and their Relationships with the Community; Patterns and Levels of Ports in Urban Development: The Case of Marseilles; Port Traffic and Industrial Development at Bordeaux; Port Developments, Port-City Linkages and Prospects for Maritime Industry: A Case Study of Southampton; Industrialization in Naval Ports: The Portsmouth Case
TL;DR: Communication port is an encapsulation of two language properties: "communication non-determinism" and "communication disconnect time" that provides a tool for progranmers to write well-structured, modular, and efficient concurrent programs.
Abstract: A new language concept–communication port (CP), is introduced for programming on distributed processor networks. Such a network can contain an arbitrary number of processors each with its own private storage but with no memory sharing. The processors must communicate via explicit message passing. Communication port is an encapsulation of two language properties: "communication non-determinism" and "communication disconnect time." It provides a tool for progranmers to write well-structured, modular, and efficient concurrent programs. A number of examples are given in the paper to demonstrate the power of the new concepts.
TL;DR: In this paper, the paths followed by migrants in Latin America between the time they reach the city and the time that they settle into a secure and stable environment were studied. But the authors focused on the paths of migrants in Mexico City and Port of Spain Trinidad.
Abstract: This study is concerned with the paths followed by migrants in Latin America between the time they reach the city and the time they settle into a secure and stable environment. Data for the study are from Mexico City and Port of Spain Trinidad. (ANNOTATION)
TL;DR: In this article, the relocation of several port functions and the establishment of inland container terminals have been discussed, with increasing commercial and recreational pressures on urban waterfront lands, growing demand by seaports for back-up areas and changes in cargo-distribution concepts.
Abstract: Increasing commercial and recreational pressures on urban waterfront lands, growing demand by seaports for back-up areas and changes in cargo-distribution concepts have caused the relocation of several port functions and the establishment of inland container terminals.
TL;DR: The number of road accidents in Papua New Guinea has risen by more than 400% between 1968 and 1978 as discussed by the authors, and the number of deaths were nearly equally divided between passengers and pedestrians with drivers forming only 16% of the total.
Abstract: The number of fatal road accidents in Papua New Guinea has risen by more than 400% between 1968 and 1978. Papua New Guinea now has over thirteen times as many fatal road accidents per 10,000 registered vehicles as Great Britain. The Highlands show fatal accident rates about three times higher than those for Papua New Guinea as a whole. Of 121 road accident victims coming to post-mortem in Port Moresby between 1975 and 1978, two-thirds were young adult males. Deaths were nearly equally divided between passengers and pedestrians with drivers forming only 16% of the total. Post-mortem blood alcohol levels were above 80 mg% in 42% of the victims tested and very high levels were found in a third of the drivers. A plea is made for safer passenger vehicles, the use of seat belts and the introduction of breath testing for alcohol, along with public education to reduce the toll of accidents.
TL;DR: An electrohydraulic control arrangement comprising at least one terminal plate having an inlet port connected to a pump pumping fluid under pressure from a tank and an outlet port connected with a return conduit leading to the tank and a plurality of consumer plates having consumer ports connected to consumers of pressure fluid is described in this paper.
Abstract: An electrohydraulic control arrangement comprising at least one terminal plate having an inlet port connected to a pump pumping fluid under pressure from a tank and an outlet port connected to a return conduit leading to the tank and a plurality of consumer plates having consumer ports connected to consumers of pressure fluid. All plates are arranged side by side and held in abutting relationship by tightening screws extending through axially aligned bores through said plates. The plates are further provided with three axially aligned fluid channels therethrough, one to be connected to the inlet port and the two others to the outlet port. The selective connection of the fluid channels to the respective ports is accomplished in the terminal plate by a control slide movable by auxiliary valves, one of which is controlled by an electromagnet and by an additional control slide in each of the consumer plates, the position of which is controlled by two additional auxiliary valves. Each of the consumer plates includes two further auxiliary valves cooperating with a control piston in such a manner that when one of the consumer ports of the respective consumer plate is connected to the inlet port, the other is automatically connected to the outlet port.
TL;DR: In this paper, the authors proposed to adjust an opening degree of a communication passage communicating a suction port with a discharge port to provide the same wind feeding performance in both 50Hz and 60Hz areas.
Abstract: PURPOSE: To provide the same wind feeding performance in both 50Hz and 60Hz areas, by adjusting an opening degree of a communication passage communicating a suction port with a discharge port. CONSTITUTION: A communication passage 20 is formed on the partition part 19 located between a suction port 14 and a discharge port 15. This passage 20 allows a leak of partial flow from high pressure at the discharge port 15 to the suction port 14. In case of operating a 50Hz designed fan with 60Hz, it can not be fit for use due to extremely high air output and overload of the motor. In such a case, when a closing member 21 is moved so that the passage 20 may be opened, the performance suitable for 60Hz can be obtained. COPYRIGHT: (C)1982,JPO&Japio
TL;DR: In this article, a movable valve member having a venting passage is located in the body and is biassed to a first position where the passage provides communication between the first and second ports.
Abstract: A venting valve comprising a body having first and second ports. A movable valve member having a venting passage is located in the body and is biassed to a first position where the venting passage provides communication between the first and second ports. A chamber is located within said body and a third port opens into the chamber. The construction and arrangement is such that the introduction of sub-atmospheric pressure into the chamber via the third port causes the valve member to move to a second position where the first port is isolated from the second port but is opened to the third port via the chamber.
TL;DR: In this article, a memory device is constructed having a plurality of output ports, each output port being one word wide, such that the plurality of words may be accessed from the memory simultaneously.
Abstract: A memory device is constructed having a plurality of output ports, each output port being one word wide, such that a plurality of words may be accessed from the memory simultaneously.
Abstract: Fieldwork at Port Moller, in 1977, provides new information on the placement of this site in hlaska Peninsula prehistory. Seven cultural' strata Qverlie sterile soil on the highland portion of the site. Only the three uppermost of these cultural layers (overlying sand) are present in the lowland portion of the site. Eight of 11 new radiocarbon dates confirm previous evidence 'suggesting an extensive second millennium B.C. occupation. Two other occupations dating ' around 600 and 1400 years ago ,have also been defined. Three periods of occupation have been identified. The oldest (15QO-1000 B.C.) is characterized by large grooved and perforated stone weights, flaked stemmed points, and possibly round to oval houses. The middle period (middle of the first mil-lennium A.D.) witnesses the appearance of small notched pebbles, flaked points of triangUlar outline, toggle harpoon heads, ornaments,, and' ivory carvings of humans and animals. Houses are rectangular. A late period (second millennium A.D.) with rather poor organic preservation reserribles the middle ' period in inventory. There'is considerable stability in the organic artifact ' inventory throughout the occupation. Closest cultural connections are seen with stone inventories dated around the beginning of the Christian era at Chig-nik on the Alaska Peninsula and with the long sequence at Chaluka on Umnak Island in the AleutianS, but some connections are also seen with Norton-related cultures at the base of the Alaska Peninsu.la, reinforcing previous conclusions that the geographic position of the Port Moller site exposed it to ideas emanating from' several different directions. Virtual absence of ground slate artifacts・ and total absence of pottery at the site rende,r detailed comparison with the last several thousand years of Pacific Eskimo prehistory difficUlt.
TL;DR: In this article, an improved apparatus for recycling asphaltic concrete comprises a rotatable drum having a first port at one end open to atmosphere, a burner adjacent the first end, a second port at a second end of the drum with means for closing the second port, means for recovering the composition from the second ports and whereby the closure means and composition recovery means at the first port cooperate to maintain the secondport closed except to the extent necessary to recover composition.
Abstract: An improved apparatus for recycling asphaltic concrete comprises a rotatable drum having a first port at one end open to atmosphere, a burner adjacent the first end, a second port at a second end of the drum with means for closing the second port, means for recovering the composition from the second port and whereby the closure means and composition recovery means at the second port cooperate to maintain the second port closed except to the extent necessary to recover composition.