Dual band

The principal solar water-splitting models predict dual-band gap photoelectrolysis efficiencies of 16% [40], and 10-18% [41]. 

Principal solar water-sphtting models had predicted similar dual band gap photoelectrolysis efficiencies of only 16% and 10-18% [3, 28], respectively, whereas recently dual band gap systems were calculated to be capable of attaining over 30% solar photoelectrolysis conversion efficiency [14]. The physics of the earlier models were superb, but their analysis was influenced by dated technology, and underestimated the experimental jjphoto attained by contemporary devices or underestimated the high experimental values of JJelectrolysis which Can be... 

Table 3 includes predicted maximum photoelectrolysis Using observed /(photo of various dual band gap sensitizers. It is seen that solar water spKtting efficiencies may be viable at up to double the amount of that previously predicted. Efficient, three or more multiple band gap photoelectrolysis... 

If you travel a lot, you will probshty want to locdt for phones diat c r dual band, dual mcxle or both. Lets take a kx>k at each of these editions. 

Dual Band A pheme that has dual band capability can switch fiequencies. This means diat it can operate in both the 800 and 1900 MHz bands. For example, a dual band TDMA phone andd use TDMA services in either an 800 MHz or a 1900 MHz system. 

Dual Band/Dual Mode The best of both wotick allows you to switch between frequency bands and transmission modes as needecL... 

Ate you looking fiir anah or digital Do you prefer PCS or cellular TDMA or CDM If you have read the How They Work section, then you know what each of these terms mean. Look for dual mode/dual band phones if you travel alot. 

An example of a dual-band structure made of large tripoles interlaced with small ones is shown in Figs. 9.15 and 9.16. The large tripoles are provided with... 

We saw in the previous section how the fundamental and the second harmonic of a tripole element could be moved apart from each other by use of suppressors. We could in that way avoid excitation of the second harmonic of the low-frequency elements. However, by inspection of the resonance curve for the loaded three-legged element shown in Fig. 2.23 in reference 114 we observe a distinct nnll at a Ireqnency twice the fundamental. Thus, the tripole loop element is already suitable for a dual-band surface with the ratio 2 1 between the two bands. 

These observations were typical for relatively small ratios between the two resonant frequencies (10-20%). For larger ratios like an octave or more, we demonstrated that arrays of large and small elements could be interlaced into each other and we could indeed obtain a dual-band structure, provided that ... 

R. A. HUl, The Design of a Dual Band Frequency Selective Surface and the Effect of Perturbing the Elements and the Interelement Spacing, Ph. D. Dissertation, Ohio State University, Department of Electrical Engineering, Columbus, OH, 1991. 

A new solid-state MAS NMR method involving dual-band selective double cross polarization for heteronuclear polarization transfer between dilute spins has been described by Zhang et alP A sinusoidal modulation scheme has been described for selective heteronuclear polarization transfer between two dilute spins in double cross polarization MAS NMR spectroscopy. During the second cross polarization, the C rf amplitude is... 

Wearable antennas with dual-band operation capability received greater attention than single-band antennas for 5.8 GHz. In this section, some relevant contributions of the... 

Figure 26.9 Half-diamond dual-band textile antenna protot)fpe.

In another recent publication by Mishra et al. [32], a wearable dual-band patch antenna with circular polarization is presented, constructed using conductive metalized nylon fabric (ZeU) for patch and ground plane, and a denim substrate. Its circular polarization outperforms linear polarization as it maximizes transmit/receive power, owing to its orientation independence. The topology consists of a modified rectangular slot patch antenna, with a particular L-shaped topology for the feed, with a surrounding... 

S. Agneessens, H. Rogier, Compact half Diamond dual-band textile HMSIW on-body antenna, IEEE Trans. Antenn. Propag. 62 (5) (May 2014) 2374—2381. 

S. Zhu, R. Langley, Dual-band wearable textile antenna on an EBG substrate, IEEE Trans. Antenn. Propag. 57 (4) (April 2009) 926—935. 

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