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Online since: February 2012
Authors: Ying Ying Wang, Deng Jia Wang, Yan Feng Liu
Considering the indoor temperature reduction should not be too large during intermittent heating break, it is recommended to adopt external insulation.
According to the Lhasa meteorological data, the sun radiation is strong during the daytime, and the daily temperature range (DTR) is bigger in winter, generally speaking, the daytime temperature is above 0℃.
The indoor temperature and heating load variation rules are influenced by outdoor meteorological data, room floor, orientation, building thermal performance, ventilated circumstance, indoor heat source, intermittent heating mode and so on.
The software’s accuracy has been validated by a lot of experimental data.
Considering the indoor temperature reduction should not be too big during the intermittent heating break, it is recommended to use external insulation.
Online since: January 2013
Authors: Liang Chi Zhang, H.H. Ruan
The result shows that with the reduction of temperature, the overall viscosity changes from the harmonic mean of the subsystems, which is dominated by the fast relaxations, to the arithmetic mean governed by the slowest relaxation.
The success of AG law is because (i) it can reduce to other fitting equations, e.g., the classical Vogel-Fulchner-Tamman (VFT) law [6] or more recently Mauro et al.’s equation [7]; and (ii) it provides an elegant interpretation of viscosity variation – the reduction of viscosity of a material is due to the increasing number of stable configurations it can switch.
It is shown that the analytical result fits the experimental data when the energy barrier is between 1.1~1.2 eV.
Online since: November 2010
Authors: Ai Hong Bi, Jin Hua Zhu
The precursor doped with W6+ and Mo6+ ionic was prepared using oxalic acid as reduction acid, V2O5 as vanadium source, (NH4)6W7O24·6H2O and (NH4)6Mo7O24·4H2O as doped sources.
So, it can be used in different areas, such as temperature sensing devices[4], optical switching devices[5-6], modulator and polarizer of submillimeter wave radiation[7], optical data storage medium[8], variable reflectance mirrors[9] and energy efficiency windows[10] and so on.
The fifth mass loss located near 440.7 oC which corresponding to the 441.7 oC in the DSC curve with the mass loss of 0.86%, this exothermic peak could be judged to a reduction process which the reducing CO gas generated VO2 to form other vanadium oxides.
Online since: September 2018
Authors: Hichem Farh, Mosbah Zidani, Mokhtar Bayarassou
Wire section reduction shows a change in microstructure and texture.
Table 1 The chemical composition of studied material (aluminum alloy (6101 series) determined by the Laboratory-ENICAB company, Biskra-Algeria (weight %) Al Mg Si Fe Cu 98.46 0.687 0.589 0.211 0.020 2.1 Micrographic study by scanning electron microscope The microstructure of Al-Mg-Si aluminum alloy wire for different reduction in thickness by cold-drawing and the chemical composition of the particles observed are made using scanning electron microscope (SEM) equipped with EDAX (Energy Dispersive X ray microanalysis).
X-Ray Diffraction Analysis The X-ray diffraction pattern of the as received Al-Mg-Si alloy wire is shown in (Figure 3) according to the ASTM data sheet [see annex], the peaks presented corresponding to the cubic face-centered CFC structure of the aluminum matrix, we give results show that the most intense peak is that (111) of the matrix of aluminum, This shows that the grains have a preferred orientation and other peaks of aluminum (200), (311), (220) and (222) with different intensities.
Online since: November 2012
Authors: Zhen Dong, Qiang Zhao, Yang Yang Liu, Xin Li Ge
It concludes that CSP does well in the energy saving and emission reduction, and the unit price per kilowatt and discount rate have direct impacts on the investment cost of CSP.
The data are shown in table 1 and 2[6].
Conclusion Based on the above analysis, CSP does well in the energy saving and emission reduction, and the unit price per kilowatt and discount rate have direct impacts on the investment cost of CSP.
Online since: October 2007
Authors: Dana Salomie, Radu Mureşan, Codruta Pavel
From the two compositions there were prepared samples by conventional route of liquid phase sintering, followed by thermal treatment in a neutral atmosphere (N2, Ar) and by rotary forging with different reduction degree.
Experimental part Taking into account the lake of data from the literature regarding the behavior at deformation through rotary forging of AGW, as well as some solicitations for their practical applications, the authors decided to study the behavior at FR of two AGW from the system W-Ni-Fe: 90 %wt.W, 7 %wt.Ni, 3 %wt.Fe and respective, 93 %wt.W, 4,9 %wt.Ni, 2,1 %wt.Fe.
After every passage. corresponding to a certain reduction degree. from the forged bars there were cut off samples for the tensile test and for the metallographic study.
Online since: December 2010
Authors: Carlos Aquino, Takahisa Okamoto, Shogo Yagi, Masumi Inoue
Previous studies [2,3] proved the reduction in drying shrinkage of limestone concrete but in those studies are not yet clear the mechanism that affect this reduction.
This paper deals with the volume change of limestone itself and it is thought that this could be a reason of the reduction in drying shrinkage of concrete.
The gauge was attached to a data logger equipment which was measuring its volume change.
The reduction of the drying shrinkage in concrete made with limestone was possibly caused by the volume change of aggregate.
Online since: February 2012
Authors: Yi Jin Ren
Generally, it is believed that the interaction between the chains and substrate enhances with decreasing film thickness, leading to the reduction of mobility of the chain molecules, thus, the crystal growth rates derease.
For the films thinner than 6nm, the reduction of the growth rate with decreasing film thickness became more obvious, and the size of the dendritic crystal had changed, as shown in Fig. 1b.
The diffusion length of chains from the melt to the crystal growth front increases, leading to the reduction of the diffusion rate, further resulting in the decrease of the crystal growth rate, which is the reason for the foregoing non-linear increase of lamellar surfaces.
The full line represents a fit of equation (1) to the measured data[14].
For the films thicker than the crystal thickness, the growth rate is controlled by the common nucleation mechanism, the decrease of the growth rate is attributed to the reduction of the film thickness.
Online since: June 2010
Authors: Olivier Bouaziz, D. Barcelo, Xavier Sauvage
Then, this macroscopic composite is cold drawn down to a diameter of 1mm with an intermediate annealing treatment (2h at 600°C) performed at 80% of reduction to recover some ductility.
At the final stage, the volume fraction of Mg in the composite is about 24% leading to a density of 6.3 (e.g. a reduction of about 20% comparing to steel).
Optical microscopy observations (data not shown here) did not reveal any significant change of the microstructure comparing to the original as-drawn material (i.e. no globulization of the filament was observed).
One should note however that the measured reduction of area was 22%, indicating that the composite exhibits a significant level of ductility.
After annealing the composite has obviously softened and the elongation at fracture has increased up to 12% (with a reduction area of 27%).
Online since: April 2010
Authors: Kevin Matocha, Hong Piao, Aveek Chatterjee, Vinayak Tilak, Jody Fronheiser
A significant landmark towards the realization of SiC MOSFET has been the incorporation of nitrogen via post-oxidation anneals [1], which yields an order of magnitude reduction of electrically active defects at the complex 4H-SiC/SiO2 interface and a significant increase in inversion channel mobility (µinv).
Poggi et al. [3] have observed reduction of interface trap density with nitrogen implantation of the SiC surface.
All data analyses were accomplished using the commercial software package CasaXPS, version 2.2.14, supplied by Casa Software Ltd. 4.
Figure 6 quantifies the reduction in threshold voltage correlated with the increase in inversion channel mobility.
We observe that improvement in inversion channel mobility is accompanied by reduction in threshold voltage.
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