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Online since: October 2010
Authors: Benedetto Bozzini, Ivonne Sgura, Deborah Lacitignola, Claudio Mele, Mariapia Marchitto, Antonio Ciliberto
As the Mn contents in the Zn-Mn alloys increases, the grain size of the surface coatings increases and the colour of the Mn coatings changes from a bright and mirror-like silver shine to dark black, but reflective, and consisting mainly of spherical grains [13, 16].
In the deposition of single-phase fcc Al-Mn alloys, increasing Mn content up to 7.5 % leads to a decrease in grain size; Mn contents higher than ca. 10% give rise to the formation of amorphous deposits [14].
The morphological quality of the deposits seems to be correlated with the number of chelating moieties present in the additive: globular deposits with hydrogen-related holes are found with Titriplex-I, closer-packed globuli with EDTA and separate, tinier, pyramidal crystallites tend to form in the presence of DTPA.
COMSOL Simulations: Case i) for d ≥ d* , for example d=40, and ν ∈ I, spotty patterns still arise, but for increasing values of ν the number of spots increases and they become larger and higher, see Fig. 6 and 7.
The Mn electrodeposition experiments reported in this paper - apart from validating our extended mathematical model - have achieved two major metal plating results in their own right: (i) we have shown that chelating agents can play a vital role in the electrodeposition of compact Mn films - though not smooth enough for aeronautic applications - from aqueous solutions with a relatively high cathodic efficiency, their effectiveness seems to correlate positively with the number of chelating moieties present in the molecule; (ii) notably smooth, compact, γ-phase Mn layers can be plated with cathodic efficiencies in excess of 90% from eutectic ionic liquid electrolytes; these layer exhibit both a corrosion performance and a surface finish that can be regarded as adequate for the aeronautic industry.
Online since: October 2018
Authors: Maria A. Vasilyeva
When the Reynolds number increases the thickness of the underlayer is reduced.
The influence of the roughness on the hydraulic resistance increases and becomes dependent both on the Reynolds number and on the average roughness height on the surface of the pipeline.
A further increase in the Reynolds number transfers the pumped liquid to the turbulent flow regime, in which the sublayer completely collapses, and the friction depends only on the roughness.
The value of the coefficient of hydraulic resistance λ is determined by the formula simplified by the authors, having the form: (2) where - the number of similarity regime of fluid motion.
The generalization of a large number of results of field studies made it possible to establish a mathematical relationship between the coefficient of equivalent uniform grain roughness Ke and the altitude parameter of physical roughness Ra: Ke = 2 Ra1,33 (5) When determining the value of λ in each of the parameters in formula (2) - b, m and n, the calculated internal diameter of the pipeline (pipes) din is also included.
Online since: April 2020
Authors: Kristýna Hrabová
Nanomaterial concrete is new generation concrete formed of materials of the grain size of nanoscale.
Despite the fact that there is already a number of available definitions, no practical and unambiguous definition of nanomaterials exists.
This definition describes nanomaterials as natural, incidental or manufactured materials containing particles in an unbound state or as an aggregate or as an agglomerate, where 50% or more of the particles in the number size distribution or one or more external dimensions is in the size range of 1-100 nm [5].
Online since: May 2014
Authors: Qiong Yu, Ming Li Li, Kun Ming Qian, Yu Song Zhou, Song Ji
The micro structure such as grain size, morphology and crystal phase was examined by SEM, TEM and XRD methods.
After melting a block raw material of aluminum, the continue heating cause the splashing of a large number of atoms near the surface as the temperature rises.
Therefore, these irregular floc presented in the powder was estimated as the amorphous material gathered from a number of clusters and crystal nuclei retained during the preparation process.
Online since: October 2011
Authors: Cu Ne Gou, Xiao Hong Hao
A large number of by-products (oil foot, soap, deodorizer distillate) as a pharmaceutical and chemical raw materials, with high economic value.If we turning waste into treasure, with a complete process from the deodorizer distillate extract tocopherols, sterols, squalene, and to obtain fatty acid methyl esters (commonly known as biodiesel), integrated development and production of high value-added products that can bring significant social and economic benefits.
A large number of by-products (oil foot, soap, deodorizer distillate) as a pharmaceutical and chemical raw materials, with high economic value.
Vol. 6 (1994), p. 105-109.In Chinese [2] Xiaofeng Shi.Grain & Oil Machinery.2010(2),p. 73-75.In Chinese [3] Enoch Y Park,AiKato,Hwa Ming.
Online since: November 2012
Authors: Jun Chao Bao, Qing Long Wang
A designed experimental study has been conducted to investigate the effect of silica fume on mechanical properties and carbonation resistance of concrete, a large number of experiments have been carried out in this study.
The main reason of silica fume can improve the carbonation resistance of concrete composite is that the grain size of silica fume particle is smaller than that of the cement.
Conclusions In order to investigate the effect of silica fume on mechanical properties and carbonation resistance of concrete, a large number of experiments have been carried out in this study.
Online since: March 2017
Authors: Renata Karska
Unfortunately a number of research methods were excluded because performed tests must be non-destructive and non-invasive.
In the case of damascus barrels, flat areas between the grain drawing were chosen.
Table 2 HARDNESS TESTS MEASURING RESULTS: GROUP I, OBJECT NUMBERS: 1, 3, 4 In the I Group, the hole results are between HV10 = 101 - 147, middle: HV10 = 107 - 147 and end: HV10 = 103-117, Table 2.
Table 2 HARDNESS TESTS MEASURING RESULTS: GROUP II A, OBJECT NUMBERS: 5, 18, 20, 21 Table 4 HARDNESS TESTS MEASURING RESULTS: GROUP II B, OBJECT NUMBERS: 16, 17, 26, 29 Table 5 HARDNESS TESTS MEASURING RESULTS: GROUP II C, OBJECT NUMBERS: 14, 28 The third group was divided in to two subgroups: A & B.
Table 6 HARDNESS TESTS MEASURING RESULTS: GROUP III A, OBJECT NUMBERS: 35, 42, 44 Table 7 HARDNESS TESTS MEASURING RESULTS: GROUP III B, OBJECT NUMBERS: 31,33 .
Online since: March 2007
Authors: Jeff T.M. de Hosson, P. Huizenga, Damiano Galvan, Yu Tao Pei
The influence of the volume fraction and grain size of TiC nanocrystallites on the coating properties has been examined.
The influence of the volume fraction and grain size of TiC nanocrystallites on the coating properties has been examined.
The coatings are coded in such a way that the numbers before the character V indicate the substrate bias in Volt, followed by the flow rate of acetylene gas in standard cubic centimeters per minute (sccm).
Online since: December 2014
Authors: Xue Mei Zhou, Yi Zhe Liu
Micro-blog not only includes content, but also includes post author, release time, the number of comments, forwarding number and other metadata information.
In order to decide words sentiment polarity, a real number ranged from -1 to 1 is selected as sentiment weight.
Sentence sentiment analysis is applied to distinguish subjective and objective of sentence, and discriminate the commendatory and  derogatory of subjective sentence; meanwhile, extract fine-grained of sentence sentiment tendency including evaluation object, view holders etc.
Micro-blog heat value is usually decided by forwarding number, comments number, listener’s number and published time of micro blogging.
For example, sina weibo aggregates micro-blog containing the same keywords and calculates forwarding number, comments number etc., meanwhile, detects hot topics according to statistics.
Online since: July 2014
Authors: Yan Zhao, Guang Zheng
The minimum number of the layers was 3.
The largest number of layers was 90.
The number of data characters in each row was same.
The features of the barcode as follow: Large capacity of information: In addition to letters, Numbers and ASCII characters, PDF417 code could also express a binary number.
Moreover, the barcode should not be restricted to the number of times of read card.
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