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Online since: May 2019
Authors: Hanaa G. Attiya, Anaam W. Watan, Tagreed M. Al-Saadi
Graphene nanoparticles (98% purity) with a grain size of about 30 nm were purchased from Loba Chemie Pvt Ltd, India.
The relationship between thermal conductivity coefficient and wt. % of graphene At low loading levels of nanoparticles of graphene, thermally conductive particles are isolated from each other by polymer matrix because of their low numbers.
However, at high loading levels of graphene nanoparticles, the dispersion operation with a large number of graphene nanoparticles contribute to form the chains of conductive, making the matrix polymer almost continuous.
Online since: September 2011
Authors: Chun Peng Wang, Fu Xiang Chu, Yu Zhi Xu, Charles R. Frihart, Linda F. Lorenz, Nicole M. Stark
The absorbance indicated the number of free amino groups available for reaction with ninhydrine reagent, and the difference in absorbancies between unmodified and acylated soy flours reflected the extent of acylation. 2.
Maple veneers were cut into 114.3 (grain direction) by 19.1 mm strips, with all wood conditioned at 22°C and 50 % relative humidity.
Assay of free amino group Although instrumental methods such as HPLC are currently used for determining compounds containing amino group, the simple and convenient ninhydrin method still possess several advantages because of no expensive equipment required and routine analysis of large numbers of samples[11].
Online since: February 2018
Authors: Xiao Zhang, Xin Xing Zhou
Soybean oil (SO), with OH#=305mg KOH/g and functionality 4.2, was bought from Lianyuangang City Jiaxiang Grain and Oil Trade Co., Ltd.
The numbers of open foams decreased with increased curing time.
The timing of events, i.e., phase separation and foam porosity, was significantly different, whereas the difference in the morphological changes was insignificant in terms of the number of closed foams.
Online since: December 2014
Authors: Wei Qin, Zan Li, Xiao Hong Wu
The charged defects in lattice structure grow in number when Al element mixed in ZnO, and free electron is easier to form, the conductivity of the AZO materials increased strongly.
From 2(a) we can see AZO are rice-like and several rice-grains always connect together.
The gas sensing mechanism can be described in terms of an adsorption/desorption process of oxygen atthe surface of sensing materials.There are a number of donor defects in the ZnO crystal structure, and Al3+ ion radius is larger than the Zn2 +, therefore it’s easy to form effective Al doping in ZnO crystals.
Online since: May 2012
Authors: Hai Ying Shen, Shu Ming Wen, Jian Liu, Dan Liu, Jiu Shuai Deng, Yong Jun Xian
From these results, it can be came to a conclusion that the Fe and S in the material is mainly pyrite with a distribution ratio of 28.45%, and there are a mass of kaolinite and a small number of quartz as main gangue minerals.
Table 8 Results of the close-circuit flotation (The cleanings 2 and 3 were conducted with relatively low slurry concentration) Product S Fe Grade [%] Recovery [%] Grade [%] Recovery [%] Concentrate 52.82 99.13 45.29 96.00 Tailing 0.21 0.87 0.83 4.00 Total 16.54 100 15.84 100 Conclusion It can be seen from the results and discussion above that: The characterization of primary material indicates that the pyrite is major useful mineral in the material, and the gangue minerals are mainly composed by kaolinite and a small number of quartz.
The majority pyrite was fine-grained disseminated in kaolinite, resulting in the surphur concentrate with low quality and low recovery by using gravity separation.
Online since: April 2018
Authors: Michal Ackermann, Jiří Šafka, Jan Koprnicky
In recent years, a number communities or startups of open source projects has been founded to deal with the use of 3D prints in prosthetics, especially prosthetics of upper limbs.
It is a very precise technology that excels with a large number of usable materials.
The resulting object of this technology has to be additionally surface-treated to avoid release of not sintered powder grains.
Online since: October 2008
Authors: Eniko Volceanov, Marin Sandu, Ştefan Sorohan, Mircea Găvan, Dan Mihai Constantinescu
The composition (grain size, processing, material form) of alumina ceramics plays an important role and looks to influence their behaviour.
Table 1 Constants of the materials used in the finite element analysis σc initial yield stress; C and P are the Cowper-Symonds strain rate parameters The experimental analysis showed that in most cases the ceramic tile can break in maximum eight parts along the total number of axes of symmetry, as shown in Fig. 17.
Using for the ceramic tile an average dimension of a finite element as 1.5 mm, it resulted a number of 20859 nodes and 16038 hexahedron finite elements; in between the eight parts (distance in between them of 20 µm) of the tile were defined 1148 points of "welding" - that is special boundary conditions - which are broken if the criteria of failure is fulfilled.
Online since: September 2020
Authors: Varvara Vinnichenko, Aleksandr Riazanov
Radioactivity Radioactivity is the ability of atoms to spontaneously change the number of particles in their nucleus.
This number shows how much it emits 1 kilogram, 1 cubic meter or 1 square meter of a particular radioactive material.
Kinetic-mathematical model of hydration of lime-silica binder, wich activated together with a fine-grained filler // Proceeding of 13th International Congress on the Chemistry of Cement. – Madrid, Spain 2-8 July 2011.
Online since: December 2009
Authors: Hassan Farhangi, E. Mahmudi
Since the material undergoes severe plastic deformation at high temperatures, the FSW process generates a fine grain structure in the centre of welds, which has been ascribed to dynamic recrystallisation.
Furthermore, in a number of studies [12-14] the tensile properties and fracture location of various aluminium alloys have been studied.
The resulting zigzag hardness profile presented in Fig. 9 clearly shows that the hardness number is higher in the particle rich bands under all welding conditions, which is (µm) 1120 rpm 900 rpm consistent with the hardening effects of secondary particles.
Online since: March 2011
Authors: Cheng Yong Wang, Jun Wang, Y.X. Song, Wu Sheng Luo
Erosion at or close to normal incidence involves the formation of crater lips of highly deformed material, which are subsequently removed as platelets after impact by a number of successive particles [8].
Also, most of the available models require a number of process dependant calibration constants thus limiting the range of the model.
Momber[23] metals Cutting wear The model only apply to a narrow range diameter abrasive grain and a constant density for a given abrasive material.
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