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Online since: February 2011
Authors: Mohamed Nor Sabirin, Mazdida Sulaiman, Azilah Abd Rahman
The conductivity enhancement of composites is caused by the presence of great number of surfaces and interfaces [5].
The presence of some voids in the sample indicates poor contact between its grains.
The increase in conductivity is attributable to an increase in amorphicity in the sample and number of free Li+ ions due to increased interactions between Li2CO3 and Al2O3 as mentioned earlier.
The presence of some voids in the sample indicates poor contact between its grains.
The increase in conductivity is attributable to an increase in amorphicity in the sample and number of free Li+ ions due to increased interactions between Li2CO3 and Al2O3 as mentioned earlier.
Online since: April 2011
Authors: Antonio Miotello, Maurizio Dapor
In particular, dislocations, microvoids, high angle grain boundaries, vacancies, and matrix impurities are all trapping sites.
Let us indicate the hydrogen concentration by c, the number of traps per unit of volume in the membrane by N, the fraction of occupied traps by q, and the diffusion coefficient of the hydrogen in the considered system by D.
If qi is the occupied fraction of the Ni irreversible traps, then (5) (6) (7) where Ni is the number of irreversible traps, ki is the capture rate per irreversible trap and qi is the occupied fraction of the Ni irreversible traps.
Let us indicate the hydrogen concentration by c, the number of traps per unit of volume in the membrane by N, the fraction of occupied traps by q, and the diffusion coefficient of the hydrogen in the considered system by D.
If qi is the occupied fraction of the Ni irreversible traps, then (5) (6) (7) where Ni is the number of irreversible traps, ki is the capture rate per irreversible trap and qi is the occupied fraction of the Ni irreversible traps.
Online since: November 2010
Authors: Bing Suo Pan, Xiao Hong Fang, Yong Chang Tian
Rock used was medium-fine grained biotite contained granite, whose hardness is 4470 MPa and compressive strength is 179.3 MPa.
(1) Where, yi is the weight of codeposited diamond; n is the number of observations.
Number of holes Total footage [m] Duration [h] Penetration rate [m/h] 1# 8 5.6 2.25 2.49 2# 8 5.6 2.33 2.40 3# 8 5.6 3.25 1.72 Fig. 2 Diamond distribution on bit face Fig. 3 Worn bit face Conclusions In this work codeposition technique of diamond in Fe deposit was studied.
(1) Where, yi is the weight of codeposited diamond; n is the number of observations.
Number of holes Total footage [m] Duration [h] Penetration rate [m/h] 1# 8 5.6 2.25 2.49 2# 8 5.6 2.33 2.40 3# 8 5.6 3.25 1.72 Fig. 2 Diamond distribution on bit face Fig. 3 Worn bit face Conclusions In this work codeposition technique of diamond in Fe deposit was studied.
Online since: June 2014
Authors: Xian Zhen Diao, Dong Zhou
Infrared spectrum study
Molecular structures of samples analysed by German Bruker company's Equinox 55 type Fourier infrared spectrometer, scope of its wave number: 4000-400cm-1; Accuracy of wave number: ≤4cm-1(4000-2000), ≤2cm-1(2000-400); Resolution: 1.5 cm -1; Through the rate of accuracy: ±0.2%T; l0 line straightness:≤±2%T.
When calcining temperature is too high, however, grain growth, the effective surface area of TiO2 is reduced, REDOX ability is reduced, TiO2 surface active hydroxyl amount is reduced, and high temperature calcining can make the crystal structure of TiO2 from anatase to rutile type, so its photocatalytic activity also decreases.
When calcining temperature is too high, however, grain growth, the effective surface area of TiO2 is reduced, REDOX ability is reduced, TiO2 surface active hydroxyl amount is reduced, and high temperature calcining can make the crystal structure of TiO2 from anatase to rutile type, so its photocatalytic activity also decreases.
Online since: January 2015
Authors: Shao Wei Pan, Miao Miao Zhang, Rui Xiang Liu
The pore here means the relatively broad part in the pore network system which is surrounded by rock grains and can contain fluid, and the throat means the relatively narrow part that connects the pores, which plays an important role in forming a channel.
Connect all these images according to random coordination number, we will then get a two dimensional random fractal network model of the pores.
Through the number of events that distributed exactly same with data of the estimated points in training image, a probability distribution could be concluded.
Connect all these images according to random coordination number, we will then get a two dimensional random fractal network model of the pores.
Through the number of events that distributed exactly same with data of the estimated points in training image, a probability distribution could be concluded.
Online since: December 2014
Authors: Fang Yuan Yuan
Carburizing agent in superior efficiency, does not produce the decarburization layer on the surface of the carburizing, no grain boundary oxidation, surface clean and bright, small distortion.
Wear resistance and corrosion resistance have improved significantly. 4.In the field of medical polymer 1)Enhance the antimicrobial properties With the rapid development of biological medicine, every year there are a large number of implanted artificial organs or parts, but there are more than half of the implant infection.
Experimental results show that all kinds of nitrogen plasma (gaseous amide, amino compounds and ammonia) after processing, can be introduced in the material surface amino, promote the cell adhesion and growth, at the same time, the number and density of material surface amino is important for cell adhesion.
Wear resistance and corrosion resistance have improved significantly. 4.In the field of medical polymer 1)Enhance the antimicrobial properties With the rapid development of biological medicine, every year there are a large number of implanted artificial organs or parts, but there are more than half of the implant infection.
Experimental results show that all kinds of nitrogen plasma (gaseous amide, amino compounds and ammonia) after processing, can be introduced in the material surface amino, promote the cell adhesion and growth, at the same time, the number and density of material surface amino is important for cell adhesion.
Online since: December 2014
Authors: Hao Dong Wang, Yan Hong Gu, Qing Xi Lu, Xiao Huang
Fig. 1 The chemical composition of soil in different places in Yanqing new town area
Table 1 Chemical composition and classification of saline soil in the main sampling points in the new town area
Serial number
Sampling depth 0-0.05 m
Serial number
Sampling depth 0.5~0.55 m
Cl-
mg/kg
SO42-
mg/kg
Saline soil type
Cl-
mg/kg
SO42-
mg/kg
Saline soil type
Y1
18.2
41.9
1.17
Sulfurous acid type
Y1
146.8
623.0
0.118
Sulfuric acid type
Y2
1286.7
5246.9
0.66
Y2
19.9
80.8
0.123
Y3
1888.4
2580.7
1.98
Y3
21.3
106.8
0.100
Y4
283.4
1745.9
0.44
Y4
39.0
147.9
0.132
Y5
18.3
168.5
0.29
Sulfuric acid type
Y5
36.1
84.3
0.214
Y6
274.9
681.8
1.09
Sulfurous acid type
Y6
20.3
76.9
0.132
Y7
183.8
1699.8
0.29
Sulfuric acid type
Y7
48.5
249.6
0.097
Y8
410.8
1987.7
0.56
Sulfurous acid type
Y8
29.6
106.8
0.138
Y9
145.7
1501.0
0.26
Sulfuric acid type
Y9
21.0
68.2
0.154
Fig. 2 The salinity of saline soil change with depth Fig. 3 Partition map of saline soil type
In the new town area, the
In the engineering construction, due to the shallow depth of saline soil, the saline soil can be directly excavated and replaced by easy compacted coarse-grained soil (such as sand), which can cut off the rise of harmful capillary water; more than 30 cm thick of compacted orthod should be laid on the top to isolate the infiltration of surface water, which can remove the salt expansion and corrosion harm of saline soil.
In the engineering construction, due to the shallow depth of saline soil, the saline soil can be directly excavated and replaced by easy compacted coarse-grained soil (such as sand), which can cut off the rise of harmful capillary water; more than 30 cm thick of compacted orthod should be laid on the top to isolate the infiltration of surface water, which can remove the salt expansion and corrosion harm of saline soil.
Online since: July 2016
Authors: Chun Lei Wan, Kaleem Ahmad, Hany S. Abdo, Mohammad A. Al-Eshaikh, Ahmed N. Kadachi, Rawaiz Khan
All the peaks are generally indexed to the standard BiSbTe PDF card number 49-1713.
The fractured surfaces of 0.5 vol. % BiSbTe/MWCNTs composite show in Fig. 5 the flake like lamellar grains of BiSbTe [9].
Acknowledgement This Project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, Award Number (11-NAN1913-02).
The fractured surfaces of 0.5 vol. % BiSbTe/MWCNTs composite show in Fig. 5 the flake like lamellar grains of BiSbTe [9].
Acknowledgement This Project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH), King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia, Award Number (11-NAN1913-02).
Online since: June 2018
Authors: Karel Dvořák, Marcela Fridrichová, Dominik Gazdič, Jana Mokrá
The resulting destruction are visible after a few months to years. [3]
Thermodynamic stability of ettringite was dealt by a number of authors [3, 5, 6, 7, 8, 9, 10, 11] Equation of decomposition of ettringite can be written as follows:
Ca6[Al(OH)6]2(SO4)3·26H2O → Ca4[Al(OH)6]2SO4·8H2O + 2CaSO4·0,5H2O + 17H2O (1)
As it has been known, ettringite is unstable at high temperatures, but also for other external parameters, such as relative air humidity and pH.
a) 8 days 22 days 99 days b) Fig. 3 SEM of ettringite exposed to the a) laboratory environment, b) environment of saturated water vapour at specific time periods of hydration In images of synthetically prepared samples of ettringite, drawn by scanning electron microscopy, prismatic grains of ettringite, which has a high nucleation and the crystallization rate, namely in high amounts, could be observed already after the first day of hydration.
Acknowledgment This work was financially supported by project number: 17-24954S “The Conditions of Thermodynamic Stability and Transformation of AFt Phases” and project No.
a) 8 days 22 days 99 days b) Fig. 3 SEM of ettringite exposed to the a) laboratory environment, b) environment of saturated water vapour at specific time periods of hydration In images of synthetically prepared samples of ettringite, drawn by scanning electron microscopy, prismatic grains of ettringite, which has a high nucleation and the crystallization rate, namely in high amounts, could be observed already after the first day of hydration.
Acknowledgment This work was financially supported by project number: 17-24954S “The Conditions of Thermodynamic Stability and Transformation of AFt Phases” and project No.
Online since: March 2015
Authors: Magdalena Popczyk, B. Łosiewicz
Therefore, the present study was undertaken in order to obtain electrochemically at different temperatures of electrodeposition (30-60oC) the nickel based composite coatings containing embedded molybdenum and molybdenum sulfide grains.
It means that the electrochemical activity of the electrodes numbered from 1 to 4 decreases with the lowering content of both MoS2 and Mo composite components in the deposited coatings.
It is clear that the Ni+MoS2+Mo composite coating deposited at the temperature of 30oC and numbered as electrode 1 (Tabs. 1 and 2), has the highest activity towards the HER (highest value of j0 and lowest values of DE10, DE100, Rct, log |Z|0.1) among all tested electrodes.
It means that the electrochemical activity of the electrodes numbered from 1 to 4 decreases with the lowering content of both MoS2 and Mo composite components in the deposited coatings.
It is clear that the Ni+MoS2+Mo composite coating deposited at the temperature of 30oC and numbered as electrode 1 (Tabs. 1 and 2), has the highest activity towards the HER (highest value of j0 and lowest values of DE10, DE100, Rct, log |Z|0.1) among all tested electrodes.