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Online since: March 2010
Authors: Qiang Xu, M. Li, L. Wang
It can be seen that the size of grains of these samples is uniform comparatively.
Clarke et al. think the minimum of thermal conductivity can be expressed by the following equation [4]. ( ) 3/22/1 B min Ω/ρ/EAk=κ (4) where Ω is an effective atomic volume, ANρmM =Ω (1) where M is the mean atomic mass of the ions in the unit cell, m is the number of ions in the unit cell, ρ is the density, and E is Young's modulus.
Online since: January 2013
Authors: Ji Sen Zhang, Long Gu, Hui Dong Yang, Xia Wu
Increasing the hydrogen dilution ratio, the film will be converted to microcrystalline silicon, and a large number of studies show that the stability of the microcrystalline silicon is greatly improved.[4-5] Due to the increase of the operating frequency, VHF-PECVD technology helped to increase the concentration of electrons in the plasma and lower the temperature, which are conducive to the stability of the film's high-speed growth.[6] Thus microcrystalline silicon thin films were prepared by VHF-PECVD under different ratios of hydrogen dilution, and structural characteristics, deposition rate and photosensitivity were analyzed under different hydrogen dilution ratios in this paper.
The most important is the passivation of the grain boundaries in the growth process, which greatly reduced density of defect states.[8] Thus it is can be found that with the improvement of the hydrogen dilution ratio, the film of amorphous components gradually reduced, while the crystal components gradually increased, crystallization rate had been improved.[9] Figure 1.
Online since: December 2012
Authors: Bing Liu, Feng Hu Wang, Jian Ping Sun, Fu Liu
You can use the back of the single-sided blade parallel to the grain grinding, after a few times higher gloss, shown in Figure 3.
Choose and the number of dyes and dyeing assistant, and the water ratio in the container, according to the needs.
Online since: February 2014
Authors: Xin Yue Fang, Yong Qiang Zhang, Peng Liu, Chen Zheng, Chao Li Yu, Wei Chao Shi, Yu Ping Tong
The surface atomic number, and specific surface area can increase with the decrease of the particle size, which makes the materials have good optical properties, magnetic, catalytic, etc., in the light absorption, medicine, magnetic medium and catalyst has a wide range of applications [5-6].
Table 1 Average grain sizes and lattice distortion of α-Fe2O3 nanocrystals (a) (b) (c) (d) 2θ(104 crystal face) 33.35 33.23 33.27 33.17 d222(nm) 0.269 0.270 0.269 0.270 average diameter (nm) 34 42 38 36 ε×103 4.68 4.79 4.70 4.70 Fig.3 shows UV-vis spectrum of α-Fe2O3 nanocrystals.
Online since: April 2015
Authors: Josef Musílek, Karel Kubečka
The input variables are as follows: - design loads of the connection: Fd1 = 43kN; Fd2 = 28kN, - width of the middle timber part: t2=140mm, - material of the middle timber part: Glued laminated timber, class GL24h, - apparent density: ρk=380 kg/m3, - angle between the load directions and the grain of the middle timber part: α = 90°, - characteristic tensile strenght of the bolt: fuk = 800MPa, - iameter of the bolts: d = 16mm, - tensile bolt area: As = 157mm2, - thickness of the outer steel plates: tplate = 8mm, - modification factor: kmod = 0,8, - partial factor for timber: γM = 1,3, - partial factor for bolts: γM2 = 1,25.
We would have to increase the number of the bolts in the girder.
Online since: March 2013
Authors: Mariyappan Thambidurai, Mahalingam Seetha, D. Mangalaraj
When the size of the prepared particles is less i.e. improvement in the number of grains increases the surface area of the nanoparticles, which can be very much applicable for the field of gas sensors. 100 nm 20 nm (a) 100 nm 20 nm (c) 100 nm 20 nm (d) 100 nm 20 nm (b) Fig. 3.
Online since: January 2007
Authors: Chang Kyu Rhee, Jin Ju Park, Byung Sun Han, Young Rang Uhm, Min Ku Lee, G.M. Kim
In recent years, as nanocrystalline powders with ultra-fine grain size promised potentials for changing and improving the mechanical properties of metal and its alloy [8], so a synthesis of the Ti-Ni alloy nanopowders have been received a great attention from the viewpoint of both the scientific research and technological applications.
The value of specific surface area of the Ti-Ni alloy nanopowders was markedly high, which was about 54.8 m 2/g based on a BET method. 20 25 30 0 5 10 15 20 Number of Particles Particle Size (nm) Fig. 3.
Online since: February 2013
Authors: Yong Wang, Ying Wang, Qing Yun Ma
Although there are large numbers of medical literature, but penetrates its content to be actually irregular, the literature data lacks has the systematic analysis to make uniform, so that the application value relative reduces largely.
A large number of medical literature knowledge maps Earlier about the build process of a single medical document knowledge map, knowledge maps you want to want to build a large number of medical literature, we start with one of the medical literature knowledge map as the Center, and then look for this medical literature most likely knowledge map, here through literature matrix to identify key words and the knowledge structure of centre of knowledge map is most similar.
Used to identify the most similar knowledge maps of a complex number is: .
This quantitative indicator is s = (N-n)/N, where s is the structure stability of map i, N is the amount of documents represented by the focal map, n is the number of documents which really cause the map’s changes
ESOM using very small numbers as the learning rate to train with the merged document terminology matrix knowledge map.
Online since: February 2011
Authors: Jian Ma
Table 1 Goals and Indexes of Ecological Environment for Sichuan Tuopai Group Sequence Number Goals Indexes 1 Discharge soot and SO2 within controlling indexes.
The utilization rate of clinker is up to 100%. 3 Make full use of waste spent grains.
Online since: June 2010
Authors: Franck Chollet, M.F. Wasiq, M.Y. Nadeem, S. Atiq
The increase in Urbach energy with increasing substrate temperature is due to increasing number of localized states which ultimately results the decrease in band gap.
This increase in roughness may be attributed to grain growth as observed in other thin films [9].
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