high temperature hot water heaters

Ngày tải lên: 05/09/2013, 08:40

Ngày tải lên: 17/12/2013, 10:45

... yields when the reaction is per- formed at high temperatures; (e) the reactions kinetics are faster at high temperatures; (f) enzymatic process- ing at temperatures near or above 100 °C minimizes the ... and stable at high temperatures, and adapted to low temperature environments. However, another theory suggests that hyperthermophiles arose from mesophiles via adapta- tion to high temperature ... mesophilic proteins at room temperature and increases with temperature, so as to allow for enzy- matic activity near 100 °C. It is only upon achieving these high temperatures that sufficient molecular...

Ngày tải lên: 07/03/2014, 05:20

... existing electrical system: and 20 High Temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications U. B, Pal and S. C. Singhal, High Temperature Science, 27 (1990) ... conductivity of pure water and pure common salt is low but that of an aqueous salt solution is high. In a short time many of the mixed oxides which exhibit high conductivity at elevated temperatures, ... the complex materials and the high expansion coefficient. Of course the difficulties are greater because of the temperature of operation. Additional 22 High Temperature Solid Oxide Fuel...

Ngày tải lên: 18/04/2014, 12:25

... operating temperature exceeds a certain value. This temperature may be as low as 30 K for some materials and as high as 90 K for others. 8 It is known from development of LTSC wires that high transport ... or intermediate (20–30 K) temperatures is worth considering. Conventional low -temperature superconductors are often used in magnets running at 4 K, but they lose their superconduc- tivity in high magnetic ... also superconducting. has slightly higher and than was used routinely in the inner core of composite magnets to achieve higher fields. has which is appreciably higher than the 18 K of has been...

Ngày tải lên: 24/04/2014, 17:13

... high- temperature, photoacoustic INTRODUCTION Silicon carbide (SiC) electronic devices hav e developed such that commercial products are now available. SiC is preferred in high- temperature, high- power, ... SiC devices at temperatures as high as 500–600  C, while Si is generally limited to 125  C. While the foregoing discussion highlights the advantage of SiC over Si for high- temperature applications, ... which exhibited higher noise levels at elevated temperatures as indicated by the larger error bars for higher temperatures in the graphical results that follow. Figure 2. Modified photoacoustic...

Ngày tải lên: 06/05/2014, 08:53

... TiB 2 powder by a self-propagating high- temperature synthesis technique. Mater Lett 2004, 58:733-738. 13. Khanra AK, Pathak LC, Mishra SK, Godkhindi MM: Self-propagating -high- temperature synthesis (SHS) ... nano-size ZrB 2 powder by self- propagating high- temperature synthesis. J Eur Ceram Soc 2009, 29:1501-1506. 15. Nersisyan HH, Lee JH, Won CW: Self-propagating high- temperature synthesis of nano-sized ... combustion temperatures are quite low. As another consequence of the high C concentration, the stoichiometry of these primitively formed TiC x particles in the Fe melt is relatively high. Then,...

Ngày tải lên: 21/06/2014, 00:20

... of catalytically active nanoislands for the growth of Si wire-like crystals. Fast anneals at high temperatures o f the structures of Si substrates with gold films deposited on them both in furnace ... not observed at any rate up to the temperature of 950°C (see Figure 5). Instead, the individual intergrain boundaries often form joints 120°j for the mentioned temperatures, indicating a steady- state ... process. Increase in th e RTA temperature result ed in t he for- mation of gold nanoislands on the surface of Si wafers. Thesizeandthedensityofislandsweredeterminedby the annealing temperature (Figures...

Ngày tải lên: 21/06/2014, 05:20

... low temperature drying at 35 o C, the mechanical strength of the rice kernels was higher at high temperature drying (Table 2, Figure 8). This value was significantly higher at 90 o C drying temperature ... drying process. High temperature (over 100 0 C) fluidized bed drying of paddy has been reported by a few researchers. But, normally it is recommended that hot air drying temperature should ... for 25-30 minutes if high temperature drying is used (Poomsa-ad et al. 2005; Prachayawarakorn et al. 2005). Although there are a few research works being reported on high temperature fluidized...

Ngày tải lên: 21/06/2014, 06:20

... than that in method (1) at elevated temperatures of 125 and 150°C. Conclusions In summary, we report the constant temperature operation of nanoribbon FETs in the temperature range of 25–150°C. In ... field-effect transistors can be used for stable high- temperature applications. The on-current level of the nanoribbon FETs decreases at elevated temperatures due to the degradation of the electron ... in response to temperature variations [10–13]. However, the reduction in mobility induced by the thermal scattering causes the operation points of the device to vary with the temperature. This temperature- dependent...

Ngày tải lên: 21/06/2014, 08:20

... Á Self-propagating high temperature synthesis (SHS) Á Soft magnetic performance Á Mechanical behavior Introduction Nanostructured materials have been shown to exhibit out- standing high strength and ... 4:11–16 123 NANO EXPRESS Nanostructured Hypoeutectic Fe-B Alloy Prepared by a Self-propagating High Temperature Synthesis Combining a Rapid Cooling Technique Licai Fu Æ Jun Yang Æ Qinling Bi Æ ... synthesized bulk nano- structured Fe 94.3 B 5.7 alloy using the one-step approach of a self-propagating high temperature synthesis (SHS) com- bining a rapid cooling technique. This method is convenient,...

Ngày tải lên: 22/06/2014, 01:20

... lm 2 )at10°C. High- temperature operation up to 65 °C was demonstrated from an unbonded GaInNAs QD laser (50 · 1,060 lm 2 ), with high char- acteristic temperature of 79.4 K in the temperature range ... 1,700 lm 2 )at10°C. High- temperature operation up to 65 °C was successfully demonstrated from an unbonded GaInNAs QD laser (50 · 1,060 lm 2 ), with high T 0 of 79.4 K in the temperature range of ... To the best of our knowledge, this is the highest temperature GaInNAs QD laser operation ever reported. Figure 11b shows the plot of ln(I th ) versus temperature (T) (left axis) and logarithm...

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 22/06/2014, 22:20

Ngày tải lên: 27/06/2014, 15:20

Ngày tải lên: 29/06/2014, 09:21

Ngày tải lên: 22/07/2014, 03:21

Ngày tải lên: 05/09/2013, 08:40

... regions of the water: the innermost (region A) water is highly immobilized, the second (region B) in which the water is less ice-like, and the third (region C) contains normalwater.BecauseLi + and ... molecules It is suggested that water molecules tend to form highly ordered clusters with enhanced hydrogen bond interactions under cold temperature [19]. Formation of such water clusters causes weaker ... properties under the high pressure conditions, i.e. changes in solubility and critical micelle concentration (CMC), is desired. Effects of subzero temperature and high pressure on water molecules It...

Ngày tải lên: 08/03/2014, 10:20

... surface. So, at high working temperature such as 600 °C, there is large number of adsorbed oxygen ions at the sur- face. And it makes the high surface density of adsorbed oxygen ions and high sensitivity ... TiO 2 sen- sors had a higher sensitivity to NO 2 than that of a pure TiO 2 sensor. Generally, the sensing film with a smaller grain size has a larger surface area of the sensing film and higher sensitivity ... There- fore, at 600 °C, the 15 wt.% WO 3 doped TiO 2 sensor had the highest sensitivity (145.4) due to its relatively small grain size. Due to its highest sensitivity to NO 2 , the 15 wt.% WO 3 doped TiO 2 sensor...

Ngày tải lên: 19/03/2014, 16:48

... phenylthiohydantoin derivates was done by high- pressure liquid chromatography (Waters, Manchester, UK) monitored by a data and chromatogra- phy control station (Waters). Molecular mass determination MALDI-MS ... nd Table 3. Temperature dependence of thiosulfate rhodanese sulfurtransferase and polysulfide sulfur rhodanese sulfurtransferase activities of Aq-477 from A. aeolicus. nd, no data. Temperature (°C) Thiosulfate rhodanese sulfurtransferase activity ... time-correlated single-photon counting technique. The instrumentation setup was essentially similar to those previously described [54,55] with modifications. Briefly, a time-correlated single- photon counting...

Ngày tải lên: 30/03/2014, 03:20