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1
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Flexural Strength Reduction in Cemented Carbides

100%
Petrovic M., Voloder A.
Acta Physica Polonica A
|
2015
|
vol. 128
|
issue 2B
B-23-B-25
EN
Cemented carbides are hard materials used in tough materials machining as well as in situations where other tools would wear away. These are one of the most successful composite engineering materials ever produced. The advantage of cemented carbides is that their structure and composition can be engineered to have properties tailored to specific applications and operations. These materials allow faster and more precise machining and will leave a better surface finish. Carbide tools can also withstand higher temperatures than standard high speed steel tools. Considering their application and known range of properties, main disadvantage of cemented carbides is appearance of their sudden fracture during machining process. This is caused by the low toughness at dynamic rates and overcoming this problem is yet to be researched further. In order to understand these limitations and provide suggestions for the improved design of the material, combined experimental and numerical analysis is currently being performed. Cohesive strength values numerically determined using Dugdale cohesive zone model are compared to flexural strength obtained experimentally. Reduction in flexural strength was then analysed and explained, relating it to the flaw size on the tensile surface of the specimen.
2
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Characterization of X-Ray Diamond Detector by Monte Carlo Method

81%
Stankovic S., Ilic R., Davidovic D., Petrovic M.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 4
816-819
EN
The use of diamond as material for X-ray detector is subject of investigation and practice in radiotherapy, space and material science and technology. This paper presents the results of application of Monte Carlo method for simulation of photon transport through diamond detector. The aim is restitution and demonstrating of numerical technique for characterization of electrical properties for different detector conditions and configurations. Monte Carlo code was adopted to determine the energy deposited and dose distribution in the structure of diamond detector. Our results show that the use of numerical simulations may be of essential help in design of diamond detector systems.
3
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Four- and Two-Wave Mixing in Solids

71%
Suchocki A., Gilliland G., Quarles G., Petrovic M., Powell R.
|
|
issue 2
207-219
EN
The paper gives an overview of theory and presents several examples of application of some holographic techniques: four-wave mixing, self-scattering and beam coupling to study nonlinear optical properties of solids. Among them excitation energy transfer in chromium-doped vibronic laser materials and picosecond study of undoped CdTe are reported.
4
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Radiation Absorption Characteristics of Titanium Alloys

61%
Stankovic S., Ilic R., Davidovic D., Petrovic M., Tadic S., Kovacevic M.
Acta Physica Polonica A
|
2009
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vol. 115
|
issue 4
820-822
EN
Titanium alloys have found numerous applications in space research, and nuclear industry and research. Since X-rays constitute an important part of the space radiation environment, numerical simulations of radiation absorption characteristics of titanium alloys were studied in this paper. The photon transport Monte Carlo software was used for determining the energy deposited in titanium samples. The numerical results show the pronounced dependence of radiation absorption properties of different combinations of components in alloy. The results obtained are encouraging in respect of optimization of structure of alloys regarding their required features in radiation shielding.
5
Content available remote

Optically-Determined Exciton Transport in GaAs Structures

52%
Gililand G., Wolford D., Hjalmarson H., Petrovic M., Klem J., Kuech T., Northrop G., Bradley J.
Acta Physica Polonica A
|
1993
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vol. 84
|
issue 3
409-417
EN
We have used an all-optical photoluminescence-imaging technique to measure excitonic transport in three types of GaAs structures in which the excitonic transitions vary from allowed direct-gap excitons to forbidden, doubly-indirect Type-II excitons. We f nd remarkable differences in the transport properties of these excitons. Our studies show that bulk free-exciton transport exhibits an anomalous laser power-dependent diffusivity, whereas quasi-2D interfacial excitons and Type-II cross-interface excitons do not. Additionally, we observe localization of cross-interface excitons at the potential disorder induced by the heterointerface roughness.
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