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Online since: July 2015
Authors: Ting Luo, Xing Yong Gu, Xiao Qing Wen
The mineral composition and granule feature of Tengri yellow sand as well as the micro-structure and infrared property of the fired body were discussed by the means of various testing such as the grain fineness distribution analysis, the XRD diffraction analysis, the SEM scanning electron microscope analysis, the coefficient of thermal expansion measure and the infrared performance detection.
The formulas marked I, II, III, IV, V mixed large number of the yellow sand ranged from 75wt% to 90wt% with ALPAS clay, ErDaoChuan red clay and yellow mud form the brickyard were prepared in this study.
Online since: January 2014
Authors: Shang Feng Du, Gang Xu, Jie Kan, Rui Rui Zhang, Li Ping Chen
Wireless sensor network technology has the potential to reveal fine-grained, dynamic changes in monitored variables of outdoor landscape.
Especially as the development of modern agriculture, microclimate information requires more fine-grained, more precise, and more real-time.[1] The on-going technological developments in the miniaturization of electronic devices and wireless communication technology have led to emergence of wireless sensor networks (WSN) which make it is possible to acquire microclimate information more timely, accurately and conveniently.
The total sample number is about 3000 and the sampling cycle is 4 hours.
Online since: January 2012
Authors: Hemalatha Elango, Karthiyayini Nagarajan
In general, there are a number of key criteria to determine the success of the indoor TMD secure system: • Convenience — the technology on which a patient monitoring system depends should be in use today and readily available on the market.
As the numbers in the plain text are between 0 and 256 we have bits in every number.
As the numbers in the first stage of the cipher text are between 0 and 256 we have bits in every number.
Sudha and Prasad Reddy P.V.G.D., “Data Encryption Technique Using Random Number Generator”, Granular Computing, 2007.
Applications of Fibonacci numbers”, 7, kluwer Academic publishers;(1998),pp.393-99
Online since: July 2024
Authors: Yong Dan Hou, Parpah Senanu Kwawukume, Derrick Boateng Asante, Lemuel Gbologah
The names corresponding to the clay numbers in Fig. 1 are displayed in Table 1.
Consequently, clay number 39, Tetegbu clay, located in the Greater-Accra Region, meets the essential requirement perfectly.
The clays that meet the criteria for flux but with slightly lower alumina content are numbers 3 (Afransi) and 43 (Anfoega Kaolin), located in the Volta region.
In similar research, excessive zirconia doping was found to aggregate and inhibit grain boundary movement needed for mullitisation [40].
With its bigger grain size compared to clay minerals, uniform distribution of grogs can also stop the propagation of crack tips.
Online since: April 2015
Authors: N.P. Shapkin, V.I. Razov, I.G. Khalʻchenko, V.I. Mayorov, A.L. Shkuratov, V.O. Trukhin, V.V. Kotochentsev
The modification of vermiculite was carried out as described below: 100g of heated to a constant weight vermiculite with the temperature of 120-150 °С, grain size equaled to 0.05-0.10 mm had been stirred in 200 ml of 12% hydrochloric acid solution for two days.
Obtained vermiculite obtained (sample number #3, table. 1) was dried to constant weight and analyzed for the content of major elements.
Moreover, the largest number of acid sites was obtained by the 12% hydrochloric acid and the same way by 10% sulfuric acid [7].
It is connected with the maximum extraction of magnesium ions from the interlayer space (Table 1, Fig. 4b), thus, the number of freed volumes is growing (Fig. 4a) and for the reason that the volume sizes are defined by the ratio of the total volume to the number of annihilation sites, the value of the specific volume, where the annihilation occurs, decreases.
After the acid treatment, the pore sizes reached of 6-14 nm and their number was increasing dramatically.
Online since: May 2011
Authors: Zeng Chao Feng, Jiang Fang Wang, Dong Zhao
And the results showed that the number of joint surface is a fundamental parameter of rock mass strength nonhomogeneity.
For limited scale network (L×L), the number of pores in maximum cluster is
Threshold permeability characteristics of nonhomogeneous rock Size of porous connection is dependent on two factors, one is porosity of homogeneous porous medium, the other is coordination number of units, which is number of neighbor units in each unit.
For the above model of threshold, the coordination number of two dimension square network is 4 and hexahedron is 6.
From Fig.4 minerals in rock no matter number or form, the distribution of density is random and rock porous numbers in arbitrary part are different.
Online since: December 2010
Authors: Mao Fu Liu, Xiong Hua Guo, Chang Rong Zhao
(4) Where α is the number of sets for training test data, Rm is measured surface roughness in the tests, and ym is the predicted surface roughness.
The inputs are population size M, crossover rate pc, mutation rate pm, and number of generations.
A suitable orthogonal array Lγ(2γ - 1) is selected for the matrix experiments, where γ is the number of experimental runs and γ-1 is the number of columns in the orthogonal array
(10) Repeat Steps (6) to (9) until the expected number M × pc has been met
In the prediction model, the number of the fuzzy rules n was 25, the total number of premise and consequent parameters was 118 (i.e. β = 118), the population size M was 200, the crossover rate pc was 0.9, the mutation rate pm was 0.1, the number of generations was 200, the orthogonal array was L120(2119), the performance index J was 0.0054 and the Gaussian function was used as the membership function.
Online since: September 2011
Authors: Michal Krzyzanowski
This procedure allows for consideration of the fine morphological features of the scale and the scale/metal interface while, at the same time, reducing the number of elements under consideration.
Assuming potential inclusion of the grain structure of the oxide scale, lubrication, generation of abrasive particles into the system, mechanical intermixing at the sub-surface layers, etc., application of traditional finite element techniques for modelling of these micro- events all at the same time becomes impossible.
Tangential viscous sliding of the oxide scale on the metal surface is allowed, arising from the shear stress transmitted from the specimen to the scale in an analogous manner to grain-boundary sliding in high-temperature creep.
Determination of the crack length is based on increment number and deactivation of the separation forces based on the crack length and J-integral value.
Online since: March 2012
Authors: Hua Qing Lai
Introduction The rapid development of die casting production for the automotive, motorcycle large number of parts and components to provide an economical and efficient production methods.
With the number of cycles increases, the crack tip near the small hole and gradually formed micro-cracks, and began to merge to form the main crack, the crack continues to expand, and finally the formation of cracks between the interconnected network of cracks caused by mold-like failure.
Thus reducing the temperature cycle amplitude, increased material strength and toughness of die-casting mold to form the surface compressive stress, may postpone or delay the thermal fatigue crack formation and expansion, from the microscopic analysis, thermal fatigue cracks in the grain boundary carbides often, the initiation of clusters of inclusions Therefore steel clean, uniform microstructure of high-quality hot work die steel with high thermal fatigue resistance.
Methods to improve the life of die-casting mold Casting design.asting over the internal organization of thick coarse grains, the formation of pores, shrinkage, oxidation, internal cracks, and is accompanied by stress generation sources, so its strength and durability performance may be lower than secondary structure formation stiffener products.
Online since: May 2014
Authors: Pasi Suikkanen, J.I. Kömi
Steel grade Yield strength, MPa Tensile strength, MPa Elongation at fracture, % Impact energy at -40 °C, J/cm2 S900 DQ 900 950 8 34 S960 DQ 960 1000 7 34 S1100 DQ 1100 1250 6 34 (tested at -20 °C) 1Tensile strength, 2Elongation to fracture with a proportional gauge length, 3Charpy V impact toughness Metallurgy of Direct-Quenched Structural Steels and Mechanisms behind the enhanced properties Typical prior austenite grain (PAG) structures of a direct quenched S960 grade steel are shown in Figure 2 a.
Patent Number US 6,2840,63.
Patent Number EP1375694 (A1), 1.2.2004
Kömi D.A Porter, Effect of austenite grain structure on the strength and toughness of direct-quenched martensite.
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