British Precise Gravity Network 1993

Author(s):  
K. Charles ◽  
R. G. Hipkin
Keyword(s):  
2013 ◽  
Vol 27 (1) ◽  
pp. 79-88 ◽  
Author(s):  
Xin Zhou ◽  
Wenke Sun ◽  
Hui Li ◽  
Shuhei Okubo ◽  
Shaoan Sun ◽  
...  

1999 ◽  
Vol 11 (4) ◽  
pp. 461-462 ◽  
Author(s):  
Philip C. Jones ◽  
Julie K. Ferris

Because of the lack of a definitive air link to an international gravity base station, the Antarctic Peninsula gravity network was originally, and still is, tied to the Potsdam gravity system via long ship links to South America (Renner 1981, Kennett 1965). An indirect link from the British Antarctic Survey (BAS) scientific station at Rothera to an International Gravity Standardisation Net 1971 (IGSN 71) base station in the UK had previously been made via a link to the BAS gravity station on the Falkland Islands in Port Stanley (McGibbon 1988). Whilst the apparent gravity difference between Port Stanley and the base station in the UK had been calculated via a two-way air tie using a LaCoste and Romberg meter (McGibbon 1988) and later strengthened with three two-way air ties using four LaCoste and Romberg meters (Bassett 1987), the link between Port Stanley and Rothera was based on a one-way tie that included a lengthy ship borne passage (McGibbon 1988). The weakness of this link insured that the adopted gravity value at Rothera continued to be based on the ship ties made by Griffiths et al. (1964) and Kennett (1965). This note describes the strengthening of the gravity link between Rothera and Port Stanley and the subsequent reassignment of the adopted gravity value at Rothera Station.


Author(s):  
I. Ermolin

В статье, без математической формализации, опираясь только на физические представления о процессе водоотведения крупного города, вскрывается потенциал экономии электроэнергии при транспортировке сточных вод по разветвленной напорно-самотечной сети. Этот потенциал, заключенный в самой ее структуре, может быть реализован путем целенаправленного оперативного перераспределения потоков сточных вод по канализационным насосным станциям и транспортным магистралям сети, добиваясь минимума суммарных затрат электроэнергии всеми насосными станциями. Показано, что расчет такого перераспределения возможен только на базе математической модели объекта, формулируя и решая соответствующую оптимизационную задачу. Обсуждаются требования, которым должна удовлетворять математическая модель объекта, и показываются ее возможности при управлении сетью не только в нормальных эксплуатационных режимах, но и при аварийных ситуациях. Рассмотрение проблемы базируется на положительных результатах широкомасштабного производственного эксперимента, проведенного ранее, по оптимальному управлению участком системы водоотведения Москвы.The article, without mathematical formalization, with due consideration of physical interpretations of the process of wastewater disposal in a large city, reveals the potential for energy savings in the process of wastewater transportation in an extensive gravity network, enclosed in its very structure. This potential can be fulfilled through targeted operational redistribution of wastewater flows over sewage pumping stations and transportation mains of the network, achieving the minimum of total energy consumption by all pumping stations. It is shown that the calculation of such a redistribution is possible only on the basis of a mathematical model of the project by formulating and solving the corresponding optimization problem. The requirements that the mathematical model of the project shall meet are discussed and its capabilities are shown while operating the network not only in normal operating conditions but also in emergency situations. The consideration of the problem is based on the positive results of a large-scale industrial experiment conducted earlier on the optimal management of a section of the Moscow sanitation system.


Author(s):  
Csapó Géza ◽  
Szatmári Gábor ◽  
Matej Klobušiak ◽  
Juraj Kováčik ◽  
Stanislav Olejník ◽  
...  

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