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Online since: September 2013
Authors: Kalyan Kumar Ray, Ayan Ray, Soumitra Tarafder, Krishna Dutta, Himadri Roy
The amount (and distribution) of DIM that forms during deformation, or the ultimate fracture, of this steel depends upon several factors: material chemistry, initial grain size, grain orientation, plastic strain, strain rate, stress state, temperature, deformation mode, etc. [12-16].
The initiation of microvoids and the effect of SR on this phenomenon have been investigated by the earlier researchers [1,26] indicating higher number of microvoids at lower strain rates than those compared to that at higher magnitudes (Fig. 6).
Some typical results of strain amplitudes vs. number of cycles are shown in Fig. 12.
Das et al. [5] have reported that varied deformation substructures with DIM at parallel shear bands, shear band intersection, shear band-grain boundary intersection, grain boundary triple points etc. generate during LCF.
Precise a′-martensite Grain boundary triple point Fig. 17: X-ray diffraction pattern showing presence of e- and a′-martensite in ratcheted specimens.
Online since: July 2014
Authors: Shu Juan Zhang
In conclusion, SOA can reduce the development cost by high recovery, shield complicated business logic by coarse grain and loose coupling to reduce the complexity, and makes the large-scale development software possible by organizing professional division.
SOA is a coarse-grained and loose coupling service-oriented architecture.
Coarse-grained service. 3.
When there are huge number of users, the point-to-integration is very difficult.
The experimental data used in the paper is from thefirst page of cases for years stored in HIS database of a hospital, and it includes admission number, case number, name, sex, age, diagnostic message and operation information.
Online since: October 2015
Authors: Jana Vysoka, Radka Vanickova, Radek Vejmelka, Jan Plachý
Six RBS samples have a coarse-grained gritting, two RBS have a fine-grained gritting and one RBS is without a gritting.
Characteristics of the test sample / number of test sample 2 3 10 13 14 15 16 17 23 Upper surface adjusting HP N HP HP JP HP JP HP HP modification type of bitumen coating matter P P P P P E E P P supporting insert, area weight [g/m2] 230 200 230 230 230 230 230 230 280 RBS thickness [mm] 5.2 5.24 5.16 5.15 6.25 5.46 4.8 5.67 4.8 RBS application location (state) CZ CZ CZ CZ CZ CZ CZ CZ CZ The explanation of symbols in Table 2 is following: HP - coarse gritting, JP – fine-grained gritting, N – the finish of the geotextiles weighing about 20 [g/m2], PES – polyester fleece, P – the mass modified by plastomers, E – the mass modified by elastomers.
The results of the statistical evaluation are influenced by the fact, that only a small number of samples had been taken.
We can expect that this estimate will be relatively wide due to the small number of samples [19-22].
Online since: January 2010
Authors: W.D. Sproul, Brajendra Mishra, J.J. Moore, Jian Liang Lin
On the other hand, significant increased number of Cr + ions was identified in the MPP discharge generated at the same average target power (2 kW) but with a peak power of 90 kW and a peak current of 122 A (not shown in Table 1), confirming that a large fraction of the target Cr atoms were ionized in the MPP process due to the high peak power and peak current on the target.
It can be seen that the CrN coating grown by dcMS at -50 V bias contains typical long columnar grains with the grain size in the range of 50-100 nm (Fig. 4a).
From the plasma diagnostic study (Fig 2) [12], it has demonstrated that MPP plasma exhibits significant increases in the number of both target material (Cr) and gas (Ar) ions than continuous dc plasma.
Therefore, the highly ionized MPP plasma provides enhanced ion bombardment from the low energy ion species, which leads to the interruption of the columnar grain growth and the improved the coating structure and density even without using the aid of the substrate bias (Fig.4b).
Significant increases in the number of both target material (Cr) and gas (Ar) ions in MPP plasma than continuous dc plasma were demonstrated, suggesting significant increased target material ionization fraction was achieved in the MPP condition.
Online since: November 2005
Authors: Nobusuke Hattori, Cong Ling Zhou, Shinichi Nishida, Wen Xian Sun
Specimens were firstly polished with emery paper (#400-#3000) and then with diamond paste (the grain size from 0.1µm to 0.03µm).
Comparing the surface of the two kinds of specimens, the grain sizes of the treated samples are greatly refined.
It is well known that the refined grain is very effective in resisting the crack initiation and in improving the fatigue strength.
Precipitate with a certain size and number is the most effective in obstructing the movement of dislocation and producing the maximum strengthening and hardness.
The difference lies in the number of crack initiation and propagation behavior.
Online since: June 2010
Authors: Guang Chao Chen, Cheng Ming Li, Wei Zhong Tang, Jian Hua Song, Li Fu Hei, Fan Xiu Lu, Yu Mei Tong
It was shown that both the fracture strength and fracture toughness were dependent to the grain size of the diamond films, in a manner similar to Hall-Petch relationship.
Due to the columnar nature of the grain growth, a similar relationship between the fracture strength and fracture toughness with the sample thickness was also demonstrated.
The fracture strength and fracture toughness of the arcjet freesatnding diamond films is 300 - 1000MPa, and 3-8 MPa.m3/2 respectively depending on the sample thickness and grain size.
Whilst a number of high technology applications are under research and development in the Beijing Plasma diamond Technology R&D Center.
Acknowledgements The authors wish to thank the NSFC (Natural Science Foundation of China) for financial support through the contract numbers of 50572007 and 50872010.
Online since: September 2011
Authors: Zhi Bin Liu, Xin Ma, Wen Long Dai
The grain size distribution of the kaolinite is shown in Fig. 1.
Table 1 Chemical composition of the kaolinite sample Chemical composition Al2O3 Fe2O3 TiO2 SiO2 Loss of ignition Water content Content [%] 37 0.4 0.6 46 14.5 1.5 Table 2 Characteristics of the kaolinite sample Characteristic Quantity measured Liquid limit [%] 32 Plastic limit [%] 23 Plastic index [%] 9 Soil classification CL Optimum water content [%] 15 Maximum dry density [g/cm3] 1.70 Specific gravity 2.67 Figure 1 Grain size distribution of the kaolinite sample Experimental scheme of the heavy metal-contaminated kaolinite Table 3 Contamination concentration and corresponding specimen number Chemical reagent Contamination concentration [mg/kg] Specimen number Cu(NO3)2·6H2O 100 Cu100 Cu(NO3)2·6H2O 400 Cu400 Cu(NO3)2·6H2O 800 Cu800 Cu(NO3)2·6H2O 1600 Cu1600 Zn(NO3)2·6H2O 150 Zn150 Zn(NO3)2·6H2O 500 Zn500 Zn(NO3)2·6H2O 800 Zn800 Zn(NO3)2·6H2O 1600 Zn1600 Pb(NO3)2 250 Pb250 Pb(NO3)2 500 Pb500 Pb(NO3)2 650 Pb650 Pb(NO3)2 800 Pb800 Cu, Zn, and Pb-contaminated kaolinite specimens were
As mentioned before, the grain size of the commercial kaolinite sample is lower than 0.3 mm.
The specimen numbers are listed in Table 3, from which the contamination type and concentration can be easily judged.
Online since: January 2020
Authors: D.M. Galimov, Aleksandr A. Dyakonov, Dmitry V. Ardashev
The microstructure of the base metal, in addition to the hardened HFC layer, consists of pearlite (dark) and ferrite (light) grains [15–16].
To measure the microhardness of the chrome plating, given the extreme fragility of the chrome-plated layer, double grinding was performed on standard abrasives with decreasing grain size (from 150 μm to 7 μm) and polishing the surface on abrasives with a grain size of 3 μm and 1 μm [17].
Microhardness Analysis Results Sample cross section Sample radial section Print number HV(100 g) Print number HV(100 g) 1 783 1 997 2 886 2 962 3 941 3 1057 4 988 4 1011 5 986 5 1005 6 991 6 1010 7 1072 7 908 8 967 8 929 9 1041 9 953 10 975 10 1046 Average value 963 Average value 988 Standard deviation 81 Standard deviation 49 The average microhardness value obtained by measuring the micro section in the cross section was 960 HV, the standard deviation 80.
Acknowledgments The study was financially supported by the Ministry of Science and High Education of the Russian Federation within the framework of the Russian Federal Program for the development of Russian science and technology between 2014 and 2020, unique identifying number of the project RFMEFI57817X0256 (contract no. 14.578.21.0256).
Online since: September 2022
Authors: Noor Ul Huda, Shahzad Naseem, Saira Riaz, Syed Sajjad Hussain, Rabia Arooj, Zain Fatima, Nabi Ur Rehman, Qaisar Iqbal, Amatul Saboor Jawaid, Mohsin Khan, Rashid Ali Sandhu
Experimental Details The AlN nanopowder of 99.95 % purity with an average grain size of 100 nm was purchased, while the AlN thin film was synthesized by RF magnetron sputtering.
The value was matched as JCPDS card number for a hexagonal phase wurtzite structure (Space group number 186, Reference code 00-025-1133) [16].
The peak of (002) corresponds to the AlN and the three peaks of (200), (220), and (311) corresponds to the copper substrate verified by JPCD card number 01-089-2838 [17].
The increased non-band-edge PL could be explained by linear and planar flaws found in large-angle grain boundaries [21].
The deposited AlN films had a columnar structure, with linear and planar flaws in large-angle grain boundaries in films with a low orientation degree.
Online since: February 2011
Authors: Zan Zhi Wang
From the results of fatigue tests, the relationships between the maximum stress range at notch root Δσmax and the number of cycles till fatigue crack initiation Ni had been obtained.
From the results of fatigue test, the relationship curve between the crack length a and the number of cycles N, i.e. a~N curve for each specimen was obtained.
The short cracks can be divided into microcracks and physical cracks demarcated by the characteristic length at , which is about 1.5 times the average grain size [1].
The grain size of matrix is some 10μm~20μm.
Conclusions (1)The relationships between the maximum stress range at notch root Δσmax and the number of cycles before fatigue crack initiation Ni had been determined.
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