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Online since: September 2013
Authors: Xin Hua Zhang, Sai Tian, Huai Ru Dai, Wei Lin, Zhi Chun Yao, Yun Bo Wang, Qiao Yu Kong, Jia Wen Zhu
According to the source and the present situation of waste concrete, through fully broken to improve grain shape, reduce the recycled aggregates are the weak factors, as the preparation of some or all of the aggregate concrete, to produce recycled concrete strength development will not produce adverse effect.
And recycled aggregate particles Table 1 The basic properties of the coarse aggregate coarse aggregate natural aggregate recycled aggregate RC-A RC-B Particle size range(mm) 5-40 5-40 5-40 Waste concrete strength (MPa) - 24.6 37.8 bulk density(kg/m3) 1420 1248 1286 apparent density(kg/m3) 2712 2410 2468 crushing index(%) 4.87 10.2 9.8 water absorption(%) 0.35 3.52 2.77 more edges and corners, rough surface, the composition contains a considerable amount of hardened cement mortar, mortar pore water mudstone itself is larger, and in the process of crushing, its internal produced a large number of micro cracks.
For example: number RC-A-10 meaning as A kind of waste concrete aggregate replacement of native aggregate 10%, and so on.
Block in the standard curing room standard curing 28 days respectively to detect a number of data, the remaining piece of 56 days also continue to maintenance detection as a trial data, test the content of rebound testing and compressive strength test, the spring back process according to the technical specification for concrete compressive strength of the rebound method "(JGJT23-2011).
Mainly because a large number of cement mortar adhered on the surface of the recycled coarse aggregate, resulting in a decline in surface hardness and rebound value reduced.
And recycled aggregate particles Table 1 The basic properties of the coarse aggregate coarse aggregate natural aggregate recycled aggregate RC-A RC-B Particle size range(mm) 5-40 5-40 5-40 Waste concrete strength (MPa) - 24.6 37.8 bulk density(kg/m3) 1420 1248 1286 apparent density(kg/m3) 2712 2410 2468 crushing index(%) 4.87 10.2 9.8 water absorption(%) 0.35 3.52 2.77 more edges and corners, rough surface, the composition contains a considerable amount of hardened cement mortar, mortar pore water mudstone itself is larger, and in the process of crushing, its internal produced a large number of micro cracks.
For example: number RC-A-10 meaning as A kind of waste concrete aggregate replacement of native aggregate 10%, and so on.
Block in the standard curing room standard curing 28 days respectively to detect a number of data, the remaining piece of 56 days also continue to maintenance detection as a trial data, test the content of rebound testing and compressive strength test, the spring back process according to the technical specification for concrete compressive strength of the rebound method "(JGJT23-2011).
Mainly because a large number of cement mortar adhered on the surface of the recycled coarse aggregate, resulting in a decline in surface hardness and rebound value reduced.
Online since: May 2012
Authors: Huan Jie Cai, Yan Kang, Song Bai Song
Table 1 Index of coordinated development evaluation in WSE system
Water resources subsystem
Socioeconomy subsystem
Environment subsystem
Water resources per capita
Population density
Forest coverage
Annual runoff
Proportion of cultivated area
Proportion of flood area
Proportion of water resources utilization
GDP per capita
Proportion of treated municipal sewage
Proportion of irrigated area
Grain production per capita
Proportion of saline area
Water Consumption per 10,000RMB of GDP
Proportion of urbanization
Proportion of drought area
Water consumption per unit irrigation area
Natural population growth rate
Proportion of waste water to surface runoff
Water consumption per 10,000RMB of industrial output value
Economic growth rate
Proportion of Water Consumption for Environment
Water consumption per capita
Proportion of R&D to GDP
Proportion of environmental investment to GDP
Proportion of population with unavailable drinking water
The number of college
students per 10,000 persons
Proportion
An assessed sample, where m is the number of indicators, and the kth grade standard restructure a set pair.The connexion degree of can be expressed as (1) Where, and is degree of identity, discrepancy and contrary for , respectively. , is the coefficient of discrepancy, ; J is the coefficient of the contrary, .
Given a matrix , where m is the number of indicators, and n is the number of the samples, the entropy weight of the ith indicator is defined as (4) Where; is the entropy of ith indicator, .
If the coordination degree is expressed by the numbers within the interval [0,1], the smaller is , the bigger the coordination degree is.
So the coordination degree is described as (9) Where n is the number of the subsystems.
An assessed sample, where m is the number of indicators, and the kth grade standard restructure a set pair.The connexion degree of can be expressed as (1) Where, and is degree of identity, discrepancy and contrary for , respectively. , is the coefficient of discrepancy, ; J is the coefficient of the contrary, .
Given a matrix , where m is the number of indicators, and n is the number of the samples, the entropy weight of the ith indicator is defined as (4) Where; is the entropy of ith indicator, .
If the coordination degree is expressed by the numbers within the interval [0,1], the smaller is , the bigger the coordination degree is.
So the coordination degree is described as (9) Where n is the number of the subsystems.
Online since: July 2016
Authors: Marek Slováček, Josef Tejc, Momir Vanek
The number of macro sections, time steps are defined based on the welding technology parameters and experience with this method.
The LG methodology enables simulate very huge structure with very large number of the weld joints.
Shrinkage method (SM), WELD PLANNER Code: The Weld Planer is new programme and can be used for very fast distortion prediction on construction with high number of welding joints.
Austenitic grain size 5.
Based on welding numerical solution there is possible make optimization of clamping tools as modification of stiffness or place and number. 4.
The LG methodology enables simulate very huge structure with very large number of the weld joints.
Shrinkage method (SM), WELD PLANNER Code: The Weld Planer is new programme and can be used for very fast distortion prediction on construction with high number of welding joints.
Austenitic grain size 5.
Based on welding numerical solution there is possible make optimization of clamping tools as modification of stiffness or place and number. 4.
Online since: January 2014
Authors: Ji Li Sun, Min Lv
The test materials are280mm long, 700mm wide and 2mm thick and straight grained materials used in length direction as the fiber direction.
Looking at the length direction of the highest probability is the principal curvature 1 bend model to evaluate the vibration characteristics, and only the number of frequency transfer function 1 times the number of the natural bending vibration by inverse Fourier transform, get the attenuation curve and calculate the logarithmic decrement.
The dynamic modulus can be calculated from calculated 1 time natural bending vibration number.
Suppose the 1 bending vibration number is equal to the 1 natural bending vibration numbers of the both ends of the beam, and Dynamic modulus of the plate is calculated, then the dynamic modulus is divided by density to calculate the ratio of dynamic modulus.
Core material effect on wave number and vibrational damping characteristics in carbon fiber sandwich composites.
Looking at the length direction of the highest probability is the principal curvature 1 bend model to evaluate the vibration characteristics, and only the number of frequency transfer function 1 times the number of the natural bending vibration by inverse Fourier transform, get the attenuation curve and calculate the logarithmic decrement.
The dynamic modulus can be calculated from calculated 1 time natural bending vibration number.
Suppose the 1 bending vibration number is equal to the 1 natural bending vibration numbers of the both ends of the beam, and Dynamic modulus of the plate is calculated, then the dynamic modulus is divided by density to calculate the ratio of dynamic modulus.
Core material effect on wave number and vibrational damping characteristics in carbon fiber sandwich composites.
Online since: February 2007
Authors: Zoltán Dudás
The number of isothermal lines, the number of nodal points, the number of elements, and all the
transformation functions are the same in the input TTT diagrams and in the virtual TTT diagrams
calculated by the regression.
The number of the isothermal lines is 35 in every TTT diagram.
The interval numbers and the interval steps are also equal in every presented case.
Nr. of cases Data type Mark of the steels Figure numbers Taust.
The virtual TTT diagrams can show the influence of the independent parameters (concentration of elements, austenitisation temperature, grain size etc.)
The number of the isothermal lines is 35 in every TTT diagram.
The interval numbers and the interval steps are also equal in every presented case.
Nr. of cases Data type Mark of the steels Figure numbers Taust.
The virtual TTT diagrams can show the influence of the independent parameters (concentration of elements, austenitisation temperature, grain size etc.)
Online since: October 2011
Authors: Yong Hong Zhang
China's existing cultivated land is around 182 million mu, and statistics show that in 2006, more than 4.6 million mu were occupied, while actually the number might be more than that.
China's total grain output in 2007 was restored to that of 1996, but the population increased by 100 million.
After the eruption of the international financial crisis, the government has taken a number of employment support policies to facilitate the employment of college graduates and stabilize the employment of migrant workers.
In rural towns, the average number of health practitioners in the 1970s was 3.5 million people, while in the 1980s,it dropped to 2.5 million people and has even reduced to less than half a million people recently.
According to the World Health Organization, in the western Pacific region, the average number of health workers per thousand people is 5.8, while by the end of 2005, the average numbers of medical personnel and professional health workers per thousand people in Chinese cities were 4.96 and 2.16 respectively and the average number of rural doctors and health workers per thousand rural people was only 1.05.
China's total grain output in 2007 was restored to that of 1996, but the population increased by 100 million.
After the eruption of the international financial crisis, the government has taken a number of employment support policies to facilitate the employment of college graduates and stabilize the employment of migrant workers.
In rural towns, the average number of health practitioners in the 1970s was 3.5 million people, while in the 1980s,it dropped to 2.5 million people and has even reduced to less than half a million people recently.
According to the World Health Organization, in the western Pacific region, the average number of health workers per thousand people is 5.8, while by the end of 2005, the average numbers of medical personnel and professional health workers per thousand people in Chinese cities were 4.96 and 2.16 respectively and the average number of rural doctors and health workers per thousand rural people was only 1.05.
Online since: August 2014
Authors: Wen Bing Chang, Sheng Han Zhou
According to the established reconfigurable analysis models, assuming that the system state set corresponding to the network topology in abnormal environment ( number of nodes, m said the number of edges), among them, the part of the state transition relationship is shown in Fig. 3.
The redundancy of the network structure can be defined as the excess number of edges in the graph (the actual number of edges with minimum connected the difference between the number of edges of the tree) with the ratio of the number of edges in same size completely diagram.
Fine-grained adaptive user interface for personalization of a word processor: Principles and a preliminary study[C].
The redundancy of the network structure can be defined as the excess number of edges in the graph (the actual number of edges with minimum connected the difference between the number of edges of the tree) with the ratio of the number of edges in same size completely diagram.
Fine-grained adaptive user interface for personalization of a word processor: Principles and a preliminary study[C].
Online since: September 2013
Authors: Xiang Hua Kong, Shu Xin Zhou, Xiang Chen, Jian Zun Liu, Chuan Wei Zhang
Defects of less than 0.1mm, in general, will be a single dispersed, the number is generally small.
With one exception, once such pinhole concentrated, the number may be ten thousand square meters or more and evenly distributed.
Another reason is that on the basis of the small casting zone, the process of cold-rolled annealing is improper and result in the roughening of the stock grain boundary.
This is why there are strict requirements on the number of pinholes in the high-grade light gauge foil and the civil aluminum foil used hot-rolled wool.
Fourth, take appropriate methods to improve the density and uniformity of the organization of casting and rolling board, can effectively reduce the size and number of pinholes.
With one exception, once such pinhole concentrated, the number may be ten thousand square meters or more and evenly distributed.
Another reason is that on the basis of the small casting zone, the process of cold-rolled annealing is improper and result in the roughening of the stock grain boundary.
This is why there are strict requirements on the number of pinholes in the high-grade light gauge foil and the civil aluminum foil used hot-rolled wool.
Fourth, take appropriate methods to improve the density and uniformity of the organization of casting and rolling board, can effectively reduce the size and number of pinholes.
Online since: September 2013
Authors: Ming Qiang Pan, Li Guo Chen, Tao Chen, Shi Chun Di, Yang Jun Wang, Ji Zhu Liu
Under the action of the electric field, the insulation will be polarized, a little electronic can cross through the grain boundary or the impurity defect of the insulation and form the leakage current.
Acknowledgment This work is supported by National Natural Science Foundation of China (the Grant Number 61106110,51105263,51105262), the National Project (the Grant Number 2012AA040404, 2011ZX04013-012), the Funds of the State Key Lab of Fluid Power Transmission and Control (the Grant Number GZKF- 201028) , State Key Laboratory of Transducer Technology(the Grant Number SKT1004), the National Science Foundation for Post-doctoral Scientists of China (the Grant Number 2012M511316), and The Jiangsu Postdoctoral Sustentation Fund (the Grant Number 1102162C).
Acknowledgment This work is supported by National Natural Science Foundation of China (the Grant Number 61106110,51105263,51105262), the National Project (the Grant Number 2012AA040404, 2011ZX04013-012), the Funds of the State Key Lab of Fluid Power Transmission and Control (the Grant Number GZKF- 201028) , State Key Laboratory of Transducer Technology(the Grant Number SKT1004), the National Science Foundation for Post-doctoral Scientists of China (the Grant Number 2012M511316), and The Jiangsu Postdoctoral Sustentation Fund (the Grant Number 1102162C).
Online since: July 2019
Authors: Fabrizia Caiazzo, Vittorio Alfieri, Maria Virginia Aliberti, Paolo Argenio
Additive Manufacturing by means of laser irradiation of powder bed is receiving increasing interest in many industrial fields thanks to a number of benefits including the opportunity of producing complex, accurate components with optimized physical and mechanical features.
Introduction New methods of manufacturing are receiving special interest since a number of advantages are provided in comparison with conventional technologies.
Pre-alloyed, virgin, commercial argon gas atomized powder, 20 µm mean grain size, corresponding to the standard nominal chemical composition of Inconel 718 has been used; 20 µm thick layers have been laid by a brush recoater in inert argon atmosphere to prevent oxidation.
Introduction New methods of manufacturing are receiving special interest since a number of advantages are provided in comparison with conventional technologies.
Pre-alloyed, virgin, commercial argon gas atomized powder, 20 µm mean grain size, corresponding to the standard nominal chemical composition of Inconel 718 has been used; 20 µm thick layers have been laid by a brush recoater in inert argon atmosphere to prevent oxidation.