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Online since: January 2014
Authors: Zhao Hui Han, Pei Xian Zhu, Xiu Qin Yang, Sheng Gang Zhou
The specific conditions of sample as shown in Table 1; Table 1 The number of samples in different process Al temperature (℃) Mold temperature (℃) Differential pressure (MPa) 1# 800 400 0.5 2# 825 400 0.5 3# 850 400 0.5 (4)The coating: thermal decomposition method is used to prepare the high active coating of sample. 2.
When the Al temperature rises, the diffusion flux gradually increases as a result of increasing the diffusion coefficient , so increasing the atomics number of Ti and Al which is participate in diffusion reaction, leading to increased diffusion reaction products, which is in the same mold temperature.
Ti/wt% Ti/at% Al/wt% Al/at% 1# 37.38 25.10 62.62 74.90 2# 32.04 22.83 67.79 77.17 3# 27.42 18.41 72.58 81.42 In addition, determined by the crystal structure of the diffusion coefficient of Al is larger than the diffusion coefficient of Ti, Al atom diffusion rate is greater than Ti atoms, so it will form a certain number of vacancies in the Al side, which Ti atoms across the grain boundaries, filling the vacancy.
But the diffusion reaction layer is very small in this experiment, and its widest point is only 1.98μm, according to resistance formula: R = ρL / S, where L is the number of class 10-6, 10-6 that resistance is orders of magnitude, even if the resistivity of the alloyed layer increases, its seems negligible to the overall resistance of the composite material.
Online since: July 2014
Authors: Amarjeet Singh, Vinod Kumar Mittal, Surjit Angra
In meshed model number of elements are 249,808 and number of nodes are 385,556.
A large number of studies have shown that the further optimization of the crankshaft is possible in terms of stress and weight reduction by using different geometrical modifications in the crankshaft design, choosing a material with minimum post processing heat treatments and adopting such a manufacturing method which reduces the cost during large scale production of crankshaft and also improves its performance.
Manufacturing by forging has an advantage of obtaining a homogeneous part that shows less number of micro structural voids and defects compared to casting.
In addition directional properties from the forging process help the part to acquire higher toughness and strength in the grain flow direction.
Online since: August 2014
Authors: Xi Xi He, Xing Ming Liang
Thermal performance is significantly influenced by holes of block and thermal resistance increases as number of hole-rows increases [2] [[] Chao Teng, Qi Yang, Hong Peng.
Numerical thermal optimization of the hole structures of pottery grain concrete hollow blocks [J].
Table 1 Test results of thermal experiment of different walls Wall type Masonry unit type Block size /mm Wall size /mm Walls made of natural aggregate concrete Walls made of recycled aggregate concrete Specimen number Heat transfer coefficient / W/m2•K Specimen number Heat transfer coefficient / W/m2•K 1 Solid concrete brick 240×115×53 240×1000×1000 1N 3.22 1R 2.92 2 Concrete hollow block 390×190×190 190×1000×1000 2N 2.89 2R 2.31 3 Concrete hollow block filled with  insulation material 390×190×190 190×1000×1000 3N 2.10 3R 1.76 4 Load-bearing thermal insulation block 390×310×190 310×1000×1000 4N 1.41 4R 1.21 Gravels from Hebei Sanhe were used as natural coarse aggregate, while recycled aggregates with a maximum aggregate size of 10mm were composed of obsolete clay brick and recycled concrete produced by Beijing Shijingshan Recycled Aggregate Factory.
Acknowledgements This work was financially supported by National Sci-Tech Support Plan in the 12th Five-Year Plan of Rural Area, Project Number: 2011BAJ08B02-02-01.
Online since: March 2012
Authors: Shuang Shi Zhang, Xu Ben Wang, Wei Hua Wang
Proportional Integral Derivative Controlled object y(t) u(t) e(t) r(t) + – + + + PID controller Fig.1 PID Control System Schematic Multi-core Parallel Genetic Algorithm (McPGA) The McPGA is executed by the multi-core platform with a coarse-grain multithreading parallel model [2].
Generally, the number of threads is equal to that of cores for load balancing.
In our numerical experiments of tuning of PID parameters, use real - coded method, for Kp, Ki, Kd, are all real numbers.
What is more, compared with binary – coded method, real - coded has such advantages as, better for population stability in mutation operations, easier to use avoiding complex operations of encoding and decoding, reducing the calculation time and making higher search efficiency, suitable for larger and higher precision number, larger genetic search space, also avoiding the binary code of the “Hamming cliff”.
Crossover operator is defined according to Eq. 6, , (6) where v1’ and v2’ are descendants, v1 and v2 are cross parents, is a random number in interval [0,1), the probability of crossover operation is Pc=0.6.
Online since: January 2012
Authors: Rui Ling Qi, Hui Juan Liu, Lin Gao, Man Xue, Ding Shen
Starch with low cost is readily biodegradable, however, it derived from grain.
T/C(65/35) yarn with a yarn number of 19.6tex was sized by the grafting modified sesbania gum using a GA391 single yarn sizing machine(China).
Hairiness length [mm] 1 2 3 4 5 6 7 8 Index of hairiness [hairiness numbers/10m] Sized yarn 63.31 27.17 6.9 2 0.02 0.02 0.01 0 Base yarn 62.48 47.06 8.52 2.34 0.04 0.03 0.04 0 Acknowledgement The project of this thesis is supported by the funds from Henan Education Department (serial number: 2008A540002) and the funds from Science and Technology Bureau of Kaifeng (serial number: 09112).
Online since: March 2014
Authors: Wei Jiang, Feng Yang
It's one of the most core design idea sharing rules for the achievement of a large number of nodes, thus greatly improving the processing efficiency of the algorithm.
In addition, the algorithm in order to retain sufficient intermediate results, introduced a number of physical register is used to store a lot of rules Shared among nodes, take up a huge storage space.
Large particle event: Exterior-interior relationship between a group of records (relational table subset) of a property value changes trigger event, called the big grain events, such as: beverages goods production date change.
First of all, we're going to the automatic generation algorithm by IOT rules subnet, subnet IOT rules are generated; Due to the limited number of processor, and the calculation of the price in order to ensure that each processor of basic quite, and try to reduce the communication cost, the processor task requires a pre-allocated process first.
[4] R.Lercier, F.Morain.Counting the Number of Points on Elliptic Cures over Finite.
Online since: April 2011
Authors: Hong Qiang Ru, De Jiang Qi, Xiao Hong Yang, Xiao Guo Bi
PEO crystallization needs two stages: nucleation and crystal nucleon growth, whose energy was provided by the thermal motion of a large number of ordered polymer chains.
CeO2 nano-particles break the regular chain structure of PEO molecular, so that the total energy of thermal motion from a large number of chain segments will be reduced.
We can find that the pure PEO matrix and (PEO) 16LiClO4 system are dominated by crystal morphology—spherical crystal structure is obvious, the crystal shape rules, and the distribution is compact continuous with clear crystal grain boundary.
For pure PEO, the number of spherical crystal is relative much more, but the size is small.
Compared with pure PEO system, the spherical crystal number of (PEO) 16LiClO4 system is fewer, but has a small amount of local irregular dark areas, which is required for lithium-ion transfer amorphous region.
Online since: December 2012
Authors: Guo Yan Li, Hui Li, Si Qi Wang, Wen Xi Wang, Qiuchen Duan
Such as highway construction investment, disaster frequency number, etc.
Table 1 Ecological Safety Index System Target layer O Norm layer A Norm layer B Index layer C Ecological security comprehensive index O Driving forces A1 Economy and social development B1 Population GDP index C1 Rural per capita net income C2 Economic density C3 Industrial output C4 Population index B2 Natural population growth rate C5 Population density C6 Pressure A2 Cultural factors B3 Road construction investment proportion of GDP C7 Years sowing area C8 Agricultural output value as a proportion of GDP C9 Natural factors B4 Disasters frequency number C10 State A3 Structure security B5 Development land proportion C11 Forest coverage C12 Landscape type percentage C13 Average patch area C14 Function security B6 Annual precipitation C15 Temperature annual range C16 Land rate of output C17 Landscape diversity index C18 The waters area percentage C19 Impact A4 Environmental impact B7 Cultivated land area per capita C20 Landscape
fragmentation C21 Anthropogenic influence B8 Disaster area C22 Disaster economic loss as a proportion of GDP C23 Response A5 Human activities response B9 The school number C24 Students proportion of the total population C25 The number of teachers C26 Return the grain plots to forestry proportion of GDP C27 The new rural construction investment proportion of GDP C28 According to the division of security level to represent the ecological security state of an area, this paper has divided into 5 levels ecological security situation in the area.
Online since: July 2012
Authors: Qin Li, Xing Ye Su, Hong Mei Wang
The high local peak stress and repeated actions will make the grains in material slip, dislocate, and gradually form small cracks. , Under the continuous cycle load, the cracks can further expand and form the macro fatigue crack throughout the entire thickness of the wall, which will eventually lead to the container fatigue fracture.
(2) According to the interpolation formula in table C-1 of the JB 4732 (confirmed in 2005): (3) Allow recycle number N was derived: N = 116800 times Allow recycle number N > expected recycle number n.
As described in the criterion A, when the number of cycles exceed 1000 times, the fatigue analysis must be done.
Online since: July 2013
Authors: Yuan Bin Hou, Ling Hong Kong, Xue Cun Yang
Because coal slurry grain is thin, viscosity is high, water binding capacity is strong, when block sundries are lined into the pipeline, the pipeline is often blocked by the coal slurry in the process of transportation.
The number of input layers is 4, the number of hidden layers is 9 and the number of output layer is 1
The paste pump outlet pressure, coal slurry throughput, coal slurry water content, the main pump current and pumping number which are measured on the spot from May 24 to May 30, 2012 are taken as the sample data.
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