Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: August 2021
Authors: Ivica Boko, Sandra Juradin, Ivanka Netinger Grubeša, Dražan Jozić, Silvija Mrakovčić, Iva Vukojević
Cellulose fibers have a number of advantages such as lower cost, low density, high specific strength and stiffness, renewable sources and biodegradability, as well as some disadvantages in terms of high moisture absorption, variability of properties and reduced durability [3].
The mixtures were made with cement CEM I 42.5R and crushed limestone aggregate with max grain size D = 16 mm.
Grain size distribution curves of aggregate fractions and concrete are shown in Fig.2.
Fig. 2 Grain size distribution curves of aggregate fractions and concrete 4 mortar mixtures were also made: a reference mortar and 3 mixtures reinforced with the same type, amount, and fibers length as were used in concrete mixtures.
The mixtures were made with cement CEM I 42.5R and crushed limestone aggregate with max grain size D = 16 mm.
Grain size distribution curves of aggregate fractions and concrete are shown in Fig.2.
Fig. 2 Grain size distribution curves of aggregate fractions and concrete 4 mortar mixtures were also made: a reference mortar and 3 mixtures reinforced with the same type, amount, and fibers length as were used in concrete mixtures.
Online since: August 2015
Authors: T.P. Singh, Vijaykumar S. Jatti, Vaibhav Gaikwad
Cryo-treatment of workpiece results in reduction of the thermal vibrations, grain boundaries and refines the grain structure.
Tool wear rate is increased in case when treated NiTi is machined by untreated copper this happens because cryogenic treatment improves crystal structure and bonding of grains of material and hence spark energy required for removing the material is more.
As tool is positive pole hence very less number of electron move towards the tool and less amount of energy and heat is imparted on tool and hence tool wear rate declines.
Tool wear rate is increased in case when treated NiTi is machined by untreated copper this happens because cryogenic treatment improves crystal structure and bonding of grains of material and hence spark energy required for removing the material is more.
As tool is positive pole hence very less number of electron move towards the tool and less amount of energy and heat is imparted on tool and hence tool wear rate declines.
Online since: July 2013
Authors: Zheng Li, Bo Shao, Xue Yan Du
The results showed that mixed with silicon powder and slag powder, under the condition of lower amount of cement, The test of C60 pavement concrete structural compactness, mechanical properties and durability indicators could satisfy the design requirements; As the number of freeze-thaw cycles went up, the rate of strength loss and mass loss of the test pavement concrete increased linearly; The carbonized value increased significantly, in 7 days; growthed significantly slowed in the range of 7 days -28 days; The creep strain value increased linearly during the period of 100 days, changes leveling off after more than 100 days of age, and creep strain values stabilized.
1 Instruction
With the continuous development of high-strength concrete, good mechanical properties make it widely used in road surfacing.
to meet the high mechanical properties but also the good durability .Decades, the scientists from various countries have been committed to research the durability of concrete,and obtained many achievement [1-3]At present, compressive strength is used as the main indicator in concrete design method generally [4].The effects of silica fume and slag micropowder on the mechanical and durability of the pavement concrete [5] were studied, provides technical support in improving the surface quality of the mining heavy vehicle road. 2 Raw materials and test methods 2.1 Raw materials Cement: the Dalian Onoda Limited production 52.5R ordinary portland cement; Fine aggregate: Hun River upstream(Nanzamu)sand, natural moisture content of 2.5%, 0.2% clay content, fineness modulus of 2.6, the particle distribution area in the region Ⅱ, well graded; Coarse aggregate: from Liaoyang, crushed indicators about 8%, 5-10mm and 15-25mm gravel mixed ratio of 7:13 of the grain
pavement concrete Water- cement ratio amount of cementitious material kg/m3 Cementitious materials kg the slump mm Water consumption L Sand ratio % Sand kg/m3 gravelkg/m3 Admixtures % cement Silica fume slag micropowder 0.28 450 360 45 45 200 126 34 635 1240 2.2 Performance testing of pavement concrete: Mechanical properties with reference to the<> (GB / T 50081-2002);
Durability with reference to the<>(GBJ / T 50082-2009);
Drill core strength: CECS 03:2007<>;
Ultrasonic density: CECS21: 2000 <>.
3 Results and discussion
According to the laboratory study of the C60 concrete,Laying in the Angang Qi- Dashan concentrator test road, randomly selected a certain number
Fig.1 The strength Loss rate of the pavement Fig.2 The curve of mass loss rate concrete after the freeze-thaw test From figure 1 and figure 2 we can see that, with the number of freezing and thawing increasing, the strength and mass loss rate of the test road concrete increased, but the compressive strength and the mass loss of the concrete were not significant, the test showed the concrete has a good anti-freeze resistance
Table3 The migration coefficient of Chloride ion(RCM method) Number 1 2 3 4 The migration coefficient of Chloride ion DRCM×10-12m2/s 1.7 1.9 1.8 2.1 We can see from table3, the four groups of test results are in line with the concrete resistance to chloride ion penetration RCM-Ⅳ rating, it indicates that the test concrete is excellently resistance to chloride ion penetration
to meet the high mechanical properties but also the good durability .Decades, the scientists from various countries have been committed to research the durability of concrete,and obtained many achievement [1-3]At present, compressive strength is used as the main indicator in concrete design method generally [4].The effects of silica fume and slag micropowder on the mechanical and durability of the pavement concrete [5] were studied, provides technical support in improving the surface quality of the mining heavy vehicle road. 2 Raw materials and test methods 2.1 Raw materials Cement: the Dalian Onoda Limited production 52.5R ordinary portland cement; Fine aggregate: Hun River upstream(Nanzamu)sand, natural moisture content of 2.5%, 0.2% clay content, fineness modulus of 2.6, the particle distribution area in the region Ⅱ, well graded; Coarse aggregate: from Liaoyang, crushed indicators about 8%, 5-10mm and 15-25mm gravel mixed ratio of 7:13 of the grain
pavement concrete Water- cement ratio amount of cementitious material kg/m3 Cementitious materials kg the slump mm Water consumption L Sand ratio % Sand kg/m3 gravelkg/m3 Admixtures % cement Silica fume slag micropowder 0.28 450 360 45 45 200 126 34 635 1240 2.2 Performance testing of pavement concrete: Mechanical properties with reference to the<
Fig.1 The strength Loss rate of the pavement Fig.2 The curve of mass loss rate concrete after the freeze-thaw test From figure 1 and figure 2 we can see that, with the number of freezing and thawing increasing, the strength and mass loss rate of the test road concrete increased, but the compressive strength and the mass loss of the concrete were not significant, the test showed the concrete has a good anti-freeze resistance
Table3 The migration coefficient of Chloride ion(RCM method) Number 1 2 3 4 The migration coefficient of Chloride ion DRCM×10-12m2/s 1.7 1.9 1.8 2.1 We can see from table3, the four groups of test results are in line with the concrete resistance to chloride ion penetration RCM-Ⅳ rating, it indicates that the test concrete is excellently resistance to chloride ion penetration
Online since: August 2010
Authors: Wen Cheng Wang, Fa Liang Chang
Firstly, it needs to determine the window W which
with an odd number of pixels.
The result of thinning operation is a group of generally parallel thin lines and the line number is the steels counting.
Thus, each location will have a corresponding count number, we take the most likely number in this set of data as the final result.
(1) Inputting the binary image; (2) Adding the pixel values of each lines from left to right; (3) Outputting the curve of projection; (4) Analyzing the highest frequency of numbers; (5) Outputting the steel number.
[5] LU YALING, "Study for Automatic Grain Insect Counting System Based on Image Processing".
The result of thinning operation is a group of generally parallel thin lines and the line number is the steels counting.
Thus, each location will have a corresponding count number, we take the most likely number in this set of data as the final result.
(1) Inputting the binary image; (2) Adding the pixel values of each lines from left to right; (3) Outputting the curve of projection; (4) Analyzing the highest frequency of numbers; (5) Outputting the steel number.
[5] LU YALING, "Study for Automatic Grain Insect Counting System Based on Image Processing".
Online since: July 2012
Authors: Dan Nie, Yu Hui Wang
In this paper, we leverage whole-system, fine-grained taint tracking approach to monitor and record the information about system call arguments.
In order to get whole-system and fine-grained taint information, we monitored every instruction being processed in CPU.
The basic information of system call includes system call number, system call name, the number of system call parameters, while the detailed information of each parameter includes virtual address, type, length and value.
S(P) typically includes the information mentioned in section 3: program counter, system call number, system call name, the number of system call parameters, besides the type, virtual address, length, value of all parameters and return value
(5)Taint edge is used to express the taint relationship of two different system calls, including source pc, target pc, source system call number, target system call number, source argument number and target argument number, propagation way
In order to get whole-system and fine-grained taint information, we monitored every instruction being processed in CPU.
The basic information of system call includes system call number, system call name, the number of system call parameters, while the detailed information of each parameter includes virtual address, type, length and value.
S(P) typically includes the information mentioned in section 3: program counter, system call number, system call name, the number of system call parameters, besides the type, virtual address, length, value of all parameters and return value
(5)Taint edge is used to express the taint relationship of two different system calls, including source pc, target pc, source system call number, target system call number, source argument number and target argument number, propagation way
Online since: April 2011
Authors: Zheng Wang, Kui Wang, Lu Wang, Zi Hao Zhao
Since then a large number of studies had shown that the fractal feature of cross-section had a certain universality[5-8].
Use such methods we can calculate the number of cycles the surface short fatigue cracks under the fractal dimension, to obtain the fractal dimension with the damage trends. 2.
The average grain size was about 20μm.
To avoid crack initiating in the defective surface of notches, the notch surfaces had been polished by abrasive paper, and had been ground by abrasive grains (diamond paste of 1.5μm).
The number of the cycle times was preset according to the conditions in experiments, the experiment would be interrupted if it reached the number, and then the middle surface short fatigue crack on notches would be observed and recorded, after that the experiment continued. 3.
Use such methods we can calculate the number of cycles the surface short fatigue cracks under the fractal dimension, to obtain the fractal dimension with the damage trends. 2.
The average grain size was about 20μm.
To avoid crack initiating in the defective surface of notches, the notch surfaces had been polished by abrasive paper, and had been ground by abrasive grains (diamond paste of 1.5μm).
The number of the cycle times was preset according to the conditions in experiments, the experiment would be interrupted if it reached the number, and then the middle surface short fatigue crack on notches would be observed and recorded, after that the experiment continued. 3.
Online since: December 2013
Authors: Guang Yi Lin, Shu Ming Liu, Fang Chen Dong
Crystalline grains of TPI distribute in NR/TPI blends in the role of physical crosslinking points and make up for deficiencies of the NR/TPI blending system.
The results show that, the residual crystal of TPI distributes in form of grain in the amorphous region, the number of which increases with increasing the content of TPI from 10% to 30%.
Crystalline grains distribute in NR/TPI blends in the role of physical crosslinking points and make up for deficiencies of NR/TPI blending system.
The results show that, the residual crystal of TPI distributes in form of grain in the amorphous region, the number of which increases with increasing the content of TPI from 10% to 30%.
Crystalline grains distribute in NR/TPI blends in the role of physical crosslinking points and make up for deficiencies of NR/TPI blending system.
Online since: February 2013
Authors: Rui Hu, Bin Tang, Hui Chang, Jin Shan Li, Hong Zhong, Chun Li Huang
The results indicate that, the temperature of equilibrium solidification of Ti-Ni alloy changes with the presence of a strong magnetic field, and the morphology of dendritic grains will be affected eventually.
θ the angle between the grain growth direction and the x-axis σ interfacial energy γ the strength of anisotropy.
It’s feasible to explain grain growth with concentration field instead of phase field, in which we can discuss the solute distribution simultaneously.
Besides, in case of a strong magnetic field, there is keen competition between the branches in all directions, and the number of second branches is reduced.
θ the angle between the grain growth direction and the x-axis σ interfacial energy γ the strength of anisotropy.
It’s feasible to explain grain growth with concentration field instead of phase field, in which we can discuss the solute distribution simultaneously.
Besides, in case of a strong magnetic field, there is keen competition between the branches in all directions, and the number of second branches is reduced.
Online since: December 2010
Authors: Sheng Qiang Ma, Han Guang Fu, Zhu Xin Liu, Jian Dong Xing, Da Wei Yi
The addition of
rare earth helps to increase the number of the rod-shaped and round borides in Fe-B cast alloy
during austenitizing.
Moreover, Al can hinder the formation of carbide network along grain boundary [5].But the researches of Fe-B cast alloy modified by rare earth and Al are lacking.
The average area of each boride A in one image is given by the following equation N A A b= (2) where Ab is the area of the borides and N is the number of the borides.
Effect of RE-Al on Spheroidization of Eutectic Boride after Heat Treatment The mechanism of broken network eutectic borides in Fe-B cast alloy is similar to that of broken network eutectic carbides in M2 steel [10].Thermodynamically, when boride forms an interconnected network along matrix grain boundaries, the interfacial area of the eutectic boride network and the matrix is higher than that of spheroidal boride and matrix, so the interfacial energy of the eutectic boride network and the matrix is also higher than that of spheroidal boride and matrix.
Based on this favorable condition, the boride network is fractured and the number of isolated granular borides increases. 3.
Moreover, Al can hinder the formation of carbide network along grain boundary [5].But the researches of Fe-B cast alloy modified by rare earth and Al are lacking.
The average area of each boride A in one image is given by the following equation N A A b= (2) where Ab is the area of the borides and N is the number of the borides.
Effect of RE-Al on Spheroidization of Eutectic Boride after Heat Treatment The mechanism of broken network eutectic borides in Fe-B cast alloy is similar to that of broken network eutectic carbides in M2 steel [10].Thermodynamically, when boride forms an interconnected network along matrix grain boundaries, the interfacial area of the eutectic boride network and the matrix is higher than that of spheroidal boride and matrix, so the interfacial energy of the eutectic boride network and the matrix is also higher than that of spheroidal boride and matrix.
Based on this favorable condition, the boride network is fractured and the number of isolated granular borides increases. 3.
Online since: January 2016
Authors: Iulian Antoniac, Ana Iulia Blajan, Aurora Antoniac, Greta Vitioanu, Isidoro Giorgio Lesci
The temperature and pressure have an important significance concerning material structure properties of final product in terms of degree of crystallinity, grain size, and specific surface area.
The seas contain an uncounted number of plants and animals species.
Figure 3 shows that the powder from internal part of the snail shell was successfully ground into fine powder grains.
SEM images show that the particles exhibit grain sizes <5 µm, with a mean value around 2 µm.
We can see in Figure 4 the morphology and crystal structure of the powder from internal part of the snail shell that has a grain size of 1µm.
The seas contain an uncounted number of plants and animals species.
Figure 3 shows that the powder from internal part of the snail shell was successfully ground into fine powder grains.
SEM images show that the particles exhibit grain sizes <5 µm, with a mean value around 2 µm.
We can see in Figure 4 the morphology and crystal structure of the powder from internal part of the snail shell that has a grain size of 1µm.