Water trees diagnostic of extruded underground cables: a case study in Saudi Arabia eastern province

In this paper, different electrical diagnostic techniques reported in the literature to predict the condition of extruded underground power cables are reviewed. Two of these techniques, namely the DC leakage current method and the DC conductivity method are applied to 14 underground cable samples rated between 15 kV and 69 kV collected from the Eastern Province of the Kingdom of Saudi Arabia. For this purpose, a setup has been constructed at the High Voltage Laboratory of King Fahd University of Petroleum & Minerals, Dhahran-Saudi Arabia. The results obtained show a correlation between the DC leakage current and the conductivity testing and the presence of water trees in the insulation material of cables. Samples suspected to have water trees are examined using the microscopic testing of the insulating material. The results obtained are in agreement with the electrical testing findings

Water trees diagnostic of extruded underground cables: a case study in Saudi Arabia eastern province

In this paper, different electrical diagnostic techniques reported in the literature to predict the condition of extruded underground power cables are reviewed. Two of these techniques, namely the DC leakage current method and the DC conductivity method are applied to 14 underground cable samples rated between 15 kV and 69 kV collected from the Eastern Province of the Kingdom of Saudi Arabia. For this purpose, a setup has been constructed at the High Voltage Laboratory of King Fahd University of Petroleum & Minerals, Dhahran-Saudi Arabia. The results obtained show a correlation between the DC leakage current and the conductivity testing and the presence of water trees in the insulation material of cables. Samples suspected to have water trees are examined using the microscopic testing of the insulating material. The results obtained are in agreement with the electrical testing findings

The BANCA Database and Evaluation Protocol

In this paper we describe the acquisition and content of a new large, realistic and challenging multi-modal database intended for training and testing multi-modal verification systems. The BANCA database was captured in four European languages in two modalities (face and voice). For recording, both high and low quality microphones and cameras were used. The subjects were recorded in three different scenarios, controlled, degraded and adverse over a period of three months. In total 208 people were captured, half men and half women. In this paper we also describe a protocol for evaluating verification algorithms on the database. The database will be made available to the research community through http://www.ee.surrey.ac.uk/Research/VSSP/banca

Wpływ agrowłokniny na produkcyjność ziemniaków wczesnych

During 1999-2001 and in 2003 the effect of white fleece Pegas-agro 17 UV on the yield formation in the early irrigated potatoes (Adora and Impala cvs) was investigated in an early potatoes region of the Czech Republic. The fleece was placed over the crops for 30 days (1999), 49 days (2000), 35 days (2001) or 45 days (2003) after the planting. The fleece significantly increased yield of commercial tubers in the early harvest (02.06.1999 - 52.5%, 31.05.2000 - 21.3%, 07.06.2001 - 33.7% and 04.06.2003 - 463% in comparison with the control in average values of both cultivars). In the later sequential harvests the differences between the variant with fleece and the control variant diminished and at the end of June they were already nonsignificant. Between cultivars the greater yield effect was found in Impala as compared with Adora cv. A favourable influence of the fleece on the soil temperatures was demonstrated and also the heat insulating effect of the fleece during ground frosts was proved.W latach 1999-2001 i 2003, w rejonach korzystnych do uprawy ziemniaków wczesnych w Republice Czeskiej, prowadzono badania nad plonowaniem wczesnych odmian Adora i Impala pod osłoną z agrowłókniny Pegaz-agro 17 UV. Poletka agrowłókniną okryte były od wysadzenia ziemniaków przez 30 dni w roku 1999, 49 dni w roku 2000, 35 dni w 2001 i 45 dni w roku 2003. Zastosowanie agrowłókniny zwiększało plon ziemniaków we wczesnych terminach zbioru, średnio dla obu odmian, w stosunku do plonu uzyskanego bez okrycia, w kolejnych latach badań odpowiednio o 52,2%, 21,3%, 33,7% i nawet 463%. Podczas zbioru w końcu czerwca różnice były już nieistotne. Większy efekt zastosowania agrowłókniny uzyskano u odmiany Impala, niż u odmiany Adora. Stwierdzono pozytywny wpływ agrowłókniny na temperaturę gleby szczególnie w czasie przygruntowych przymrozków