Abstract: This excerpt covers the general planning and development of seaports. It considers port geography, changes in port systems, port-hinterland links, and the changing technology of cargo handling.

Abstract: arose quite naturally . ut of the fact that the focus of most historians was the Euro-Asian trade in high value goods, with the intra-Asian trade heing dealt with only insofar as was necessary to understand its Euro-Asian counterpart. Even in more recent years, when this essentially Eurocentric vision has given way to the study of Asian trade for its own sake, the emphasis on pepper, exotic spices, silks and rich textiles has to some extent remained. The humbler commodities that formed the real staple on which the warp and weft of Asian trade in ;h. sixteenth and seventeenth centuries were spun,

Abstract: An improved multiple port memory system has a priority network for selecting between multiple units seeking access thereto. The priority network responds to requests for access and provides encoded port identifying signals indicative of the port to have access. Decode circuitry decodes the encoded port identifying signals and provides unique port enabling signals for the selected port. Decode error detection circuitry responds to the decoded port enabling signals and provides a decode error indication any time multiple port enabling signals are detected as occurring simultaneously. Port Code error detecting circuitry respond to the encoded port identifying signals and the decoded port enabling signals to provide a code error indicating signal when a port code error condition is detected.

Abstract: An internal plate assembly for a heat exchanger comprising a plate and a pair of substantially identical inserts. The plate is formed with a manifold area at opposite ends. A pair of wall members and a plurality of fins extending therebetween. Each manifold area of the plate is provided with two ports. A flat identical insert is provided for each manifold area. The insert has one port for mating with one of the ports in the manifold area of the plate and is formed to avoid covering the other port in that same manifold area. Thus, it is possible to construct a multi-plate stacked heat exchanger utilizing parts having only two distinct configurations.

Abstract: A vandal-resistant security view port for use in prison cells and the like. The view port permits observation into a cell or room and is mounted on a frame which can be attached over an opening in a wall of the cell. The view port has a transparent pane and a grate and may be open or covered by a hinged door operable from the back side of the wall.

Abstract: PURPOSE:To suppress ascending of high-temperature warm air and help to reach the high-temperature warm air to a distant place along the floor surface of a room in order to reduce a temperature difference between the upper and lower parts of the room by a method wherein first and second blow-off ports are provided with first and second louvers, regulating the blow-off direction of warm air respectively, and the first louver is permitted to change the angle thereof CONSTITUTION:A part of indoor air, sucked from a suction port 2 provided at the back surface of a casing 1, is changed to a high-temperature air by a combustion unit 13 and is blown off downward obliquely from the second blow-off port 8 The balance of the indoor air passes through an air path 11, heated through a partitioning plate 10, is changed to slightly heated air and is blown off downward obliquely from the first blow-off port 9 The angle of the first louver 15 is set so that the blow-off angle of high-temperature warm-air of the second blow-off port 8 is smaller than the blow-off angle of low-temperature warm air blown off from the first blow-off port 9 by 5-25 deg Accordingly, the low-temperature warm air, blown off from the first blow-off port 9, suppresses the ascending of the high-temperature warm-air blown off from the second blow-off port 8 and, whereby, the high-temperature warm-air may be reached to a distant place along the floor surface of the room

Abstract: A 16 x 16 port wideband Butler matrix comprises cascaded stages A, B, C, D of four-port power dividers each divider having a fixed phase difference of either 90 DEG or 180 DEG between its output ports, the first and last stages each having eight such dividers. One output from each of four of the first stage dividers includes a fixed wideband 22.5 DEG phase shifter. A common source signal fed commutated to the 16 input ports will produce 16 different output combinations of 16 signals each with a 22.5 DEG phase increment between the 16 outputs.

Abstract: The following is a rewritten version ofa paper that was presented at the Second Annual Conference ofthe Australian Society for Historical Archaeology, held in Sydney in October 1982. In this paper Brian Egloff, of the Tasmanian National Parks and Wildlife Service, examines the subject of cultural resource management, in the light of his experiences as manager of the Port Arthur Conservation Project. He demonstrates that cultural resource management involves collaboration between a number of disciplines, of which archaeology is only one. Participants in conservation projects like that at Port Arthur need special skills and experience that differ from those of their academic colleagues. They also need to work within a management framework that will vary from project to project and should indeed be specially designed to suit each individual case.

Abstract: A three way check valve for a vehicle fluid pressure braking system includes a housing having first, second and third inlet ports and an outlet port. A pair of shuttles are slidably mounted in the housing, and are responsive to variations in the fluid pressure at the first, second and third inlet ports to communicate the inlet port having the highest pressure level to the outlet port, and to terminate communication through the other inlet ports to prevent back-flowing from one inlet port to the other inlet port.

Abstract: An analysis is conducted on the port component of the United States grain export system. A transshipment model is utilized which covers both United States internal and foreign shipments of corn, soybeans, and wheat during the four quarters of a year. The model suggests that there will be quarter to quarter constraints on port capacity but that annual capacity is adequate. Through sensitivity analysis a number of key factors were found which influence the adequacy of the current port system. Port adequacy is found to depend not as much on export market location as it does on domestic transportation rates and policies. In the last ten years there has been a significant upward trend in the volume of international trade in grains and soybeans, with exports from the United States more than doubling. Rising exports have at times brought about problems in the grain handling system, such as the rail car shortages of the 1970s and occasional congestion in the river system. Difficulties have also been encountered at ports because of delays in transferring grain from rail cars and barges onto ships (Fuller et al.). The severity of these problems has varied over geographic areas. Most have been associated with

Abstract: A directional control spool valve has service ports A, B, a supply port 5 and a bifurcated exhaust port 6 permitting direct through flow in a central position of the spool 2 For each service port, the spool has an internal passage 9, 10 with lateral openings 13, 14 When the spool is displaced from the central position, the internal passages and lateral openings define paths within the spool from the supply port to one service port, and from the other services port to the exhaust Load check valves 15 are provided in the supply flow paths

Abstract: An exhaust port system for a 2-cycle engine has a main port of a fixed opening area and a sub-port having an ad­ justable opening area. The sub-port is spaced from the main port in the direction perpendicular to the direction of movement of the piston in the cylinder.

Abstract: PURPOSE:To make it unnecessary that each system has system resources individually, by connecting two computer systems with a dual port bus and connecting shared hardware resources to the dual port bus. CONSTITUTION:Computer systems 1 and 2 are connected to system busses 11 and 21 respectively and are provided with hardware resources such as CPUs 12 and 22, memories 13 and 23, input/output controllers 14 and 24, output devices 15 and 25 like typewriters, etc. A dual port bus 30 having two input/output ports 16 and 26 is connected between system busses 11 and 12, and a hardware resource 31 shared by computer systems 1 and 2 is connected to the dual port bus 30. The shared hardware resource 31 is provided with a dual port I/O, a memory M, and an input/output device if necessary.