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Online since: August 2013
Authors: Jun Deng, Xu Ming Tan
During more than 2500 years from King Fuchai canalized the Han groove in Chunqiu Period to the early 20th century, the Canal was constructed constantly and grain was shipped across major rivers to the capital, which left behind an indelible imprint of political ideology, economy, technology and culture forms in the different periods of China, and is a testament of the determined Chinese national spirit and Great creativity.
The Grand Canal protection and management involves a number of provinces and cities, and the protection concepts in various departments are different, the specific protection measures are hard to reunification, so when destructive behavior happens, it is difficult to define and strengthen administrative accountability.
Acknowledgements This work was financially supported by the Ministry of Water Resources of the People’s Republic of China Water Resources Fee (Number: Shi Shui Zi Yuan Fei 1213).
The Grand Canal protection and management involves a number of provinces and cities, and the protection concepts in various departments are different, the specific protection measures are hard to reunification, so when destructive behavior happens, it is difficult to define and strengthen administrative accountability.
Acknowledgements This work was financially supported by the Ministry of Water Resources of the People’s Republic of China Water Resources Fee (Number: Shi Shui Zi Yuan Fei 1213).
Online since: April 2018
Authors: Meri Burzić, Radomir Jovicic, Sanja Petronić, Andjelka Milosavljevic, Olivera Eric-Cekic, Suzana Polic
The use of laser drilling in manufacturing industry can be attributed with a number of undesirable defects including recast layer, heat affected zone, oxide layer and spatter.
The structure before the treatments (Fig. 1) is irregular, with pores and grains having boundary decohesion.
Acknowledgment This work was supported by the Ministry of Science of the Republic of Serbia under contract numbers TR-35040 and TR-34015.
The structure before the treatments (Fig. 1) is irregular, with pores and grains having boundary decohesion.
Acknowledgment This work was supported by the Ministry of Science of the Republic of Serbia under contract numbers TR-35040 and TR-34015.
Online since: January 2010
Authors: Chau Chen Torng, Chi Kong Huang, Hsien Ming Chang
During a stretch forming process, if the elongation rate is too high (i.e. exceeds certain range), then
Lüdder lines occur on the appearance of the product in the beginning, and course grains and fracture in
the material will be produced as the situation becomes worse; if the elongation rate is less than certain
range, then spring back occurs, and as a result the contour of the product can not meet the
aerodynamic requirement of an aircraft.
The total element number for the sheet blank is 60 × 30, and the total element number for the form block is 50 × 50, as depicted in Figure 3.
The total element number for the sheet blank is 60 × 30, and the total element number for the form block is 50 × 50, as depicted in Figure 3.
Online since: March 2007
Authors: Jacques Merlin, Hélène Petitgand, Xavier Kleber, Aurélie Hug-Amalric, Philip Meilland
The discontinuous jumps of Bloch walls are due to their local pinning by different
obstacles such as inclusions [9], precipitates [10], grain boundaries [11] or dislocations tangles [12].
When the number of these pinning obstacles increases, the Barkhausen noise amplitude increases too.
As it was mentioned before, the Barkhausen noise amplitude (BNA) mainly depends on the number of obstacles met by Bloch walls, that is to say in a first approximation on the proportion of one metallurgical constituent.
When the number of these pinning obstacles increases, the Barkhausen noise amplitude increases too.
As it was mentioned before, the Barkhausen noise amplitude (BNA) mainly depends on the number of obstacles met by Bloch walls, that is to say in a first approximation on the proportion of one metallurgical constituent.
Online since: September 2011
Authors: Lian Tang, Wei Bing Zhang
Subjected from the constraints of natural conditions, geographical characteristics and linear index requirements of highway, a large number of high-filled embankments emerged during the construction of high –grade highway in the western mountain area.
Table 1 Physical and mechanical properties index of the filling at construction site of the high-filled embankment at K5 +536 of Lan Lin highway Stratum Water Content (ω) (%) Natural Density (γ) (kN/m3) Dry Density (γd) (kN/m3) Void Ration (e) Degree of Saturation (Sr) (%) Limit of Liquidity (ωl) (%) Limit of Plasticity (ωp) (%) Plasticity Index (Ip) Q3 Q2 22.45 15.65 18.1 19.7 15.09 16.89 0.764 0.574 79.07 33.01 27.5 29.0 16.67 17.51 10.83 11.49 Table 2 Centrifuge testing program of high-filled embankment Model Number Thickness of Foundation (cm) Height of Embankment (cm) Top Width of Embankment (cm) Model Size L×B×H (cm) Slope Model Rate Remarks LDM-1 6 30 16 54×36×36 1:1.2 100 Comparison with deformation on cross section LDM-2 6 30 16 61×36×36 1:1.5 100 LDM3 6 30 16 68.5×36×36 1:1.75 100 LDM-4 6 25 16 58×36×31 1:2.0 120 LDM-5 6 25 10.8 63.2×36×31 1:1.5-1: 1.75-1:2.0 120 LDM-6 (1),(2) 6 20 17.4 1:1.2 150 Spatial effcient a)
LDM-1 b) LDM-2 c) LDM-3 C2 S2 d)LDM-4 e) LDM-5 f)LDM-6(1) g)LDM-6(2) Fig. 1 Schematic diagram of model test program Technique of Simulation · In order to eliminate the influence of grain-size effects, the filling used for model test should be air-dried and screened by 2mm sieve mesh and then, mix the soil according to the optimum water content.
Table 1 Physical and mechanical properties index of the filling at construction site of the high-filled embankment at K5 +536 of Lan Lin highway Stratum Water Content (ω) (%) Natural Density (γ) (kN/m3) Dry Density (γd) (kN/m3) Void Ration (e) Degree of Saturation (Sr) (%) Limit of Liquidity (ωl) (%) Limit of Plasticity (ωp) (%) Plasticity Index (Ip) Q3 Q2 22.45 15.65 18.1 19.7 15.09 16.89 0.764 0.574 79.07 33.01 27.5 29.0 16.67 17.51 10.83 11.49 Table 2 Centrifuge testing program of high-filled embankment Model Number Thickness of Foundation (cm) Height of Embankment (cm) Top Width of Embankment (cm) Model Size L×B×H (cm) Slope Model Rate Remarks LDM-1 6 30 16 54×36×36 1:1.2 100 Comparison with deformation on cross section LDM-2 6 30 16 61×36×36 1:1.5 100 LDM3 6 30 16 68.5×36×36 1:1.75 100 LDM-4 6 25 16 58×36×31 1:2.0 120 LDM-5 6 25 10.8 63.2×36×31 1:1.5-1: 1.75-1:2.0 120 LDM-6 (1),(2) 6 20 17.4 1:1.2 150 Spatial effcient a)
LDM-1 b) LDM-2 c) LDM-3 C2 S2 d)LDM-4 e) LDM-5 f)LDM-6(1) g)LDM-6(2) Fig. 1 Schematic diagram of model test program Technique of Simulation · In order to eliminate the influence of grain-size effects, the filling used for model test should be air-dried and screened by 2mm sieve mesh and then, mix the soil according to the optimum water content.
Online since: July 2013
Authors: Balbir Singh, B.K. Jha, V. Kumar, S. Ghosal
All the slabs were cooled at a slow rate, using a hood cooling system and numbered as 2-1839 (1), 2-1839 (2), 2-1839 (3) and 2-1839 (4).
2.3 Hot Deformation Simulation Study in Gleeble.
Although heat treatment parameters were determined through simulation study in the Gleeble simulator, experiments were conducted on 6 number of plates by varying hardening and tempering temperatures for better understanding and optimization of the parameters.
Hot deformation and dilatometric studies in the Gleeble-3500C simulator suggested that CC slabs may be processed by deforming in the temperature range of 1000-1050°C with strain rates of about 1.0 for obtaining fully recrystallized grains in the rolled product without overloading the mill. 3.
Although heat treatment parameters were determined through simulation study in the Gleeble simulator, experiments were conducted on 6 number of plates by varying hardening and tempering temperatures for better understanding and optimization of the parameters.
Hot deformation and dilatometric studies in the Gleeble-3500C simulator suggested that CC slabs may be processed by deforming in the temperature range of 1000-1050°C with strain rates of about 1.0 for obtaining fully recrystallized grains in the rolled product without overloading the mill. 3.
Online since: August 2018
Authors: Jian Li Yuan, Nicola Macchioni, Pei Xuan Wang, Wei Zhang, Chang Yong Hu, You Jun Zhao, Sheng Cai Li
These cracks show the discontinuity of the grain in the transverse direction, but they cannot be called “defects” because they are inevitable.
In order to facilitate the detection and recording, the columns of each floor are numbered from the southwest corner. the fracture parameters were recorded, the type of defects were divided, and the defects distribution of each floor were summarized (Fig. 5, Fig. 6).
The beams of each floor is numbered from the lowest one in the south, and the fracture parameters of each beam are recorded.
In order to facilitate the detection and recording, the columns of each floor are numbered from the southwest corner. the fracture parameters were recorded, the type of defects were divided, and the defects distribution of each floor were summarized (Fig. 5, Fig. 6).
The beams of each floor is numbered from the lowest one in the south, and the fracture parameters of each beam are recorded.
Online since: April 2015
Authors: Tadeusz Knych, Piotr Uliasz, Marzena Piwowarska-Uliasz
The properties of the wires depend thus on a number of technological treatments applied in their production.
The images for the wires obtained from the CCR wire rod show the typical materials of fibrous grain structure with an insignificant number of separations.
The images for the wires obtained from the CCR wire rod show the typical materials of fibrous grain structure with an insignificant number of separations.
Online since: September 2019
Authors: Maria Gogolukhina, Leyla Mamedova, Olga Scholtz
Traditionally the weight reduction is reached by using light, but insufficient strength materials, for which a limited number of welding methods is applicable.
Parameter 1561 (АМg6) alloy R-1580 Al-Sc alloy Variance Mass of Al-constructions, ton 19 15.2 3.8 Cost of Al-alloy constructions, $ 19*5360=101 840 15.2*5448= 82 809.6 19 030.4 Number of the vessels in the program, units 35 35 - Total cost of the Al-alloys for the program, $ 3 564 400 2 898 336 666 064 Indirect economic effect.
Kodzhaspirov, On Dynamic Superplasticity of Aluminum Alloys with Initial Varying Grain Size Structure, InDefect and Diffusion Forum. 385, (2018), 78-83
Parameter 1561 (АМg6) alloy R-1580 Al-Sc alloy Variance Mass of Al-constructions, ton 19 15.2 3.8 Cost of Al-alloy constructions, $ 19*5360=101 840 15.2*5448= 82 809.6 19 030.4 Number of the vessels in the program, units 35 35 - Total cost of the Al-alloys for the program, $ 3 564 400 2 898 336 666 064 Indirect economic effect.
Kodzhaspirov, On Dynamic Superplasticity of Aluminum Alloys with Initial Varying Grain Size Structure, InDefect and Diffusion Forum. 385, (2018), 78-83
Online since: June 2021
Authors: Lia-Nicoleta Botila, Gabriela-Victoria Mnerie, Emilia-Florina Binchiciu, Octavian Victor Oancă, Ion Aurel Perianu
The FSW process allows the joining of a large number of similar and dissimilar materials which are difficult or impossible to join by other processes.
It can be seen that ultrasonic treatment leads to a significant improvement in the fatigue properties of the friction welded joint, characterized by a disposition of the curves at a higher number of cycles [14].
While in ZIT at conventional welding (figure 3.a) several areas with large grains can be detected, at the one with ultrasonic assistance, the distribution is substantially finer (figure 3.b).
It can be seen that ultrasonic treatment leads to a significant improvement in the fatigue properties of the friction welded joint, characterized by a disposition of the curves at a higher number of cycles [14].
While in ZIT at conventional welding (figure 3.a) several areas with large grains can be detected, at the one with ultrasonic assistance, the distribution is substantially finer (figure 3.b).