Question: DC systems (especially third-rail systems) are limited to relatively low voltages and this can limit the size and speed of trains and cannot use low-level platform and also limit the amount of air-conditioning that the trains can provide. This may be a factor favouring overhead wires and high-voltage AC, even for urban usage. In practice, the top speed of trains on third-rail systems is limited to 100 mph (160 km/h) because above that speed reliable contact between the shoe and the rail cannot be maintained.
Is there an answer to this question: Why DC system can effect the speed of trains?

Answer: low voltages

Question: With the building of Christian basilicas in the late 4th century, wall and ceiling mosaics were adopted for Christian uses. The earliest examples of Christian basilicas have not survived, but the mosaics of Santa Constanza and Santa Pudenziana, both from the 4th century, still exist. The winemaking putti in the ambulatory of Santa Constanza still follow the classical tradition in that they represent the feast of Bacchus, which symbolizes transformation or change, and are thus appropriate for a mausoleum, the original function of this building. In another great Constantinian basilica, the Church of the Nativity in Bethlehem the original mosaic floor with typical Roman geometric motifs is partially preserved. The so-called Tomb of the Julii, near the crypt beneath St Peter's Basilica, is a 4th-century vaulted tomb with wall and ceiling mosaics that are given Christian interpretations. The Rotunda of Galerius in Thessaloniki, converted into a Christian church during the course of the 4th century, was embellished with very high artistic quality mosaics. Only fragments survive of the original decoration, especially a band depicting saints with hands raised in prayer, in front of complex architectural fantasies.
Is there an answer to this question: In which basilica is the Tomb of Julii?

Answer: St Peter's Basilica

Question: At the beginning of the 13th century, there were reasonably accurate Latin translations of the main works of almost all the intellectually crucial ancient authors, allowing a sound transfer of scientific ideas via both the universities and the monasteries. By then, the natural philosophy contained in these texts began to be extended by notable scholastics such as Robert Grosseteste, Roger Bacon, Albertus Magnus and Duns Scotus. Precursors of the modern scientific method, influenced by earlier contributions of the Islamic world, can be seen already in Grosseteste's emphasis on mathematics as a way to understand nature, and in the empirical approach admired by Bacon, particularly in his Opus Majus. Pierre Duhem's provocative thesis of the Catholic Church's Condemnation of 1277 led to the study of medieval science as a serious discipline, "but no one in the field any longer endorses his view that modern science started in 1277". However, many scholars agree with Duhem's view that the Middle Ages were a period of important scientific developments.
Is there an answer to this question: Who favored empirical methods?

Answer: Bacon

Question: Dell assembled computers for the EMEA market at the Limerick facility in the Republic of Ireland, and once employed about 4,500 people in that country. Dell began manufacturing in Limerick in 1991 and went on to become Ireland's largest exporter of goods and its second-largest company and foreign investor. On January 8, 2009, Dell announced that it would move all Dell manufacturing in Limerick to Dell's new plant in the Polish city of odz by January 2010. European Union officials said they would investigate a 52.7million aid package the Polish government used to attract Dell away from Ireland. European Manufacturing Facility 1 (EMF1, opened in 1990) and EMF3 form part of the Raheen Industrial Estate near Limerick. EMF2 (previously a Wang facility, later occupied by Flextronics, situated in Castletroy) closed in 2002,[citation needed] and Dell Inc. has consolidated production into EMF3 (EMF1 now[when?] contains only offices). Subsidies from the Polish government did keep Dell for a long time. After ending assembly in the Limerick plant the Cherrywood Technology Campus in Dublin was the largest Dell office in the republic with over 1200 people in sales (mainly UK & Ireland), support (enterprise support for EMEA) and research and development for cloud computing, but no more manufacturing except Dell's Alienware subsidiary, which manufactures PCs in an Athlone, Ireland plant. Whether this facility will remain in Ireland is not certain. Construction of EMF4 in odz, Poland has started[update]: Dell started production there in autumn 2007.
Is there an answer to this question: For what market did Dell make computers for in Ireland?

Answer:
EMEA