da silva, e (2001) high frequency and microwave engineering

... when a perpendicular electromagnetic wave sweeps over the conductor with the velocity of light. As stated earlier, the electric and magnetic fields in a plane wave are everywhere in phase. The ... line, the wave will be reflected and travel back towards the sending end. The forward wave and the reflected wave then combine to form a voltage standing wave pattern on the line. The voltage...

Ngày tải lên: 18/04/2014, 12:24

... The external body forces are therefore equilibrated by the infinitesimal difference between the stresses in the negative and positive facets of the pair. The corresponding expressions are presented ... the constitutive law of the material under consideration, the elastic potential energy may be represented either in terms of the elements of the stress tensor, or only in terms of the elements...

Ngày tải lên: 14/03/2014, 12:20

... were selected from each of these at random. 10 triplets were selected in the same manner from the categories produced by k-means, and 10 triplets were generated by random selec- tion of content ... be improved here. For each sub- ject, we show the average over the 10 randomly selected pairs. Table 2 also shows the average of each measure over the subjects, and the two precision measures w...

Ngày tải lên: 23/03/2014, 18:20

... green and blue lights are caused to overlap on a white screen. The nature of the white light depends on the intensities of the red, green and blue lights. Equal-energy white light is produced ... of red and blue. Thus we have the three primaries red, green and blue, and the complementaries cyan, magenta and yellow; all these colours are obtainable ± with white light ± from the thr...

Ngày tải lên: 18/04/2014, 12:26

... released (transmitted) into free space, causing interference with receivers or other equipment, without necessarily understanding the phenomenon. This is because such ‘interference’ has been experienced ... related characteristics of electromagnetic waves are used as a method of referencing the waves. They are the frequency (already discussed above) and the wavelength. The latter is denot...

Ngày tải lên: 18/04/2014, 12:27

... 0.26 The behaviour of the VR averaged for each decile are presented in Figure 6 below. We see that there is a fall off in the time to mean reversion as we move from the average VR of the top decile ... case of daily data, dropping the weekend means that every Monday is in reality a three-day return rather than a one-day return. However, the interval between the last return of a day and the...

Ngày tải lên: 24/04/2014, 00:23

... are the listeners and the speaker? The listeners are the volunteer conservationists and the speaker is Mr.Brown. 1 2 3 4 5 5 del key *** ? 1. Uncles, aunts, cousins… what are they? 2. The ... started Listen and read Listen and read Mr. Brown and some conservationists are going to clean the beach. 1.Vocabulary: 2. Open prediction: II. While- reading 1.Reading and Checking : I...

Ngày tải lên: 20/07/2013, 01:25

... teachers’ experience in teaching English. Question 1 in the questionnaire was designed to measure the teachers’ experience in teaching English. The result of Question 1 is presented in Table ... phase in which learners are given chances to speak English freely. Being in a real situation, learners use English by themselves, not depend on the teacher. They can develop their own ideas and...

Ngày tải lên: 07/09/2013, 13:06

... ? =>Yes, she is =>There is a restaurant Ex: We have lived here for about 10 years.have livedWe have He has lived here for about 10 years.He has S X past present future About 10 years *Present ... ngắn Na and Nam are talking about the place where they live, but Na is new there. Nam Na *Listen and answer the questions: 1-Is Na new to the neighborhood ? 2-What is there in the...

Ngày tải lên: 14/10/2013, 03:11

... enhance the quality of teaching and learning English. However, there are still some problems such as: the modern teaching and learning equipments have not been used very effectively, some teachers ... should be pre-taught are those necessary for understanding the main idea of the text. Lastly, the teacher should let students listen to the text more than once. Moreover, after each time of...

Ngày tải lên: 19/12/2013, 14:05