Relevant bibliographies by topics / Material inhomogenity detection

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Material inhomogenity detection'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Material inhomogenity detection"

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Kopchak, Andrii, Anna Romanova, and Oleksandr Mykhailenko. "Detection of Titanium Particles in Soft Tissues Adjacent to the Fixators in Patients with Facial Fractures and Bone Defects." Journal of Diagnostics and Treatment of Oral and Maxillofacial Pathology 2, no. 1 (March 30, 2018): 25–42. http://dx.doi.org/10.23999/j.dtomp.2018.1.9.

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Background: Open reposition and rigid internal fixation are the main methods of treatment for traumatic injuries of the facial skull and an important stage of bone-plastic, reconstructive, and orthognathic surgery. In contemporary maxillofacial surgery, fixators, implants, and endoprostheses made of titanium or its alloys are widely used due to the high corrosion resistance and biocompatibility. However, recent studies have shown that none of the metal implants used in maxillofacial surgery, orthopedics or traumatology is completely inert. Moreover, they always interact with the surrounding biological environment. Thus, a number of studies have revealed the release of titanium to the adjacent soft tissues. Material and Methods: Titanium fixators (plates and screws) removed in 12 patients in late terms after osteosynthesis, as well as biopsies of the periosteum and fibrous capsule adjacent to the fixation elements made of titanium were investigated. Microscopic fluorescence spectroscopic analysis (M4 TORNADO micro-ray fluorescence spectrometer; Bruker, Bremen, Germany) was used to determine the elemental composition of the removed soft tissue fragments. Scanning electron microscopy (microscope model JSM-6060; JEOL, Japan) was used to study structural changes on the surface of titanium plates and screws. The obtained results were analized with the use of Spirman correlation coefficient, calculated by the IBM SPSS Statistics v.23 software. Results: X-ray fluorescence analysis revealed the inclusion of titanium in all investigated samples with an average content of titanium 48.14% ± 31.1% in metal deposition areas. For samples removed in patients with traumatic facial fractures after metallosteosynthesis, the average content of titanium was 55.6%, and for reconstructive surgeries – 37.72%. The acquired maps of the element deposition showed no topographic inhomogenity of titanium particles distribution. The main distribution patterns were the following: 1) areas of clearly outlined intensive titanium inclusions (90.9-800 μm), and 2) diffuse titanium inclusions which were poorly demarcated. Electronic microscopy of the investigated fixators revealed deformation of the thread, bending of screws, deformation and surface defects of the plates caused by mechanical damage, including microcracks, sharp edges, scratches, dimples.
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Alonso Ruiz, Patricia, and Evgeny Spodarev. "Entropy-based Inhomogeneity Detection in Fiber Materials." Methodology and Computing in Applied Probability 20, no. 4 (November 27, 2017): 1223–39. http://dx.doi.org/10.1007/s11009-017-9603-2.

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Xin, Hang, Jingyun Zhang, Cuihong Yang, and Yunyun Chen. "Direct Detection of Inhomogeneity in CVD-Grown 2D TMD Materials via K-Means Clustering Raman Analysis." Nanomaterials 12, no. 3 (January 27, 2022): 414. http://dx.doi.org/10.3390/nano12030414.

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It is known that complex growth environments often induce inhomogeneity in two-dimensional (2D) materials and significantly restrict their applications. In this paper, we proposed an efficient method to analyze the inhomogeneity of 2D materials by combination of Raman spectroscopy and unsupervised k-means clustering analysis. Taking advantage of k-means analysis, it can provide not only the characteristic Raman spectrum for each cluster but also the cluster spatial maps. It has been demonstrated that inhomogeneities and their spatial distributions are simultaneously revealed in all CVD-grown MoS2, WS2 and WSe2 samples. Uniform p-type doping and varied tensile strain were found in polycrystalline monolayer MoS2 from the grain boundary and edges to the grain center (single crystal). The bilayer MoS2 with AA and AB stacking are shown to have relatively uniform p-doping but a gradual increase of compressive strain from center to the periphery. Irregular distribution of 2LA(M)/E2g1 mode in WS2 and E2g1 mode in WSe2 is revealed due to defect and strain, respectively. All the inhomogeneity could be directly characterized in color-coded Raman imaging with correlated characteristic spectra. Moreover, the influence of strain and doping in the MoS2 can be well decoupled and be spatially verified by correlating with the clustered maps. Our k-means clustering Raman analysis can dramatically simplify the inhomogeneity analysis for large Raman data in 2D materials, paving the way towards direct evaluation for high quality 2D materials.
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Netzelmann, U., J. Pelzl, D. Fournier, and A. C. Boccara. "Nondestructive evaluation of magnetic materials by ferromagnetic-resonance photothermal-deflection spectroscopy." Canadian Journal of Physics 64, no. 9 (September 1, 1986): 1307–10. http://dx.doi.org/10.1139/p86-228.

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Detection of ferromagnetic resonance (FMR) by photothermal beam deflection has been used to study the spatial inhomogeneity of magnetic properties. The technique has been applied to measure the depth dependence of FMR in layered recorder tapes and to determine the lateral variation of the demagnetizing field in metal–glass ribbons.
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Chady, Tomasz, and Ryszard Łukaszuk. "Examining Ferromagnetic Materials Subjected to a Static Stress Load Using the Magnetic Method." Materials 14, no. 13 (June 22, 2021): 3455. http://dx.doi.org/10.3390/ma14133455.

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This paper discusses the experimental examination of anisotropic steel-made samples subjected to a static stress load. A nondestructive testing (NDT) measurement system with a transducer, which enables observation of local hysteresis loops and detection of samples’ inhomogeneity, is proposed. Local hysteresis loops are measured on two perpendicular axes, including one parallel to the rolling direction of the samples. The results confirm that the selected features of the local hysteresis loops provide important information about the conditions of ferromagnetic materials. Furthermore, it is shown that the selected parameters of the statistical analysis of the achieved measurements are beneficial for evaluating stress and fatigue changes induced in the material.
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Xiao, Ling, Zhuguan Liang, Yawen Li, Jian Wang, Kailin Zhou, Ping Li, Xiaohua Xu, E. I. Rau, and Wenguo Hu. "In SEM a New Method of Internal Micrographic Visualization of Semiconductor Materials and IC by Crossing the Surface." Microscopy and Microanalysis 7, S2 (August 2001): 484–85. http://dx.doi.org/10.1017/s143192760002849x.

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In the paper, we firstly publish a new method of internal micrographic visualization of semiconductor and IC. The quality and reliability of the semiconductor materials (SM) and the integrated circuits (IC) have always been concerned Having a high resolution, high reliable and nondestructive detection method is the key element for their improvements.Silicon oxide layers are used to provide the electrical insulation in the multi-structured ICs. The IC device surfaces are often protected by silicon oxide and silicon nitride layers. Therefore, these insulation layers also cover any inhomogeneity and defect located within the IC devices. It is necessary to have an examining method to detect those defects that are under the insulation layers without damaging the samples. However, the conventional scanning electron microscope (SEM) cannot be utilized to image and examine the surfaces that are positioned below the insulation layers.Novel nondestructive and contactless method has been developed in our laboratory to obtain the internal micrograph that crosses the surface of the semiconductor material and the integrated circuit.
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Rolland, J. P., and H. H. Barrett. "Effect of random background inhomogeneity on observer detection performance." Journal of the Optical Society of America A 9, no. 5 (May 1, 1992): 649. http://dx.doi.org/10.1364/josaa.9.000649.

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Chandra, Vedant, Hsiang-Chih Hwang, Nadia L. Zakamska, Simon Blouin, Andrew Swan, Thomas R. Marsh, Ken J. Shen, et al. "The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation." Monthly Notices of the Royal Astronomical Society 512, no. 4 (April 13, 2022): 6122–33. http://dx.doi.org/10.1093/mnras/stac883.

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ABSTRACT A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor can be spontaneously released as a hypervelocity runaway. One such runaway donor candidate is LP 398-9, whose orbital trajectory traces back ≈105 yr to a known supernova remnant. Here, we report the discovery of carbon-rich circumstellar material around LP 398-9, revealed by a strong infrared excess and analysed with follow-up spectroscopy. The circumstellar material is most plausibly composed of inflated layers from the star itself, mechanically and radioactively heated by the past companion’s supernova. We also detect a 15.4 h periodic signal in the UV and optical light curves of LP 398-9, which we interpret as surface rotation. The rotation rate is consistent with theoretical predictions from this supernova mechanism, and the brightness variations could originate from surface inhomogeneity deposited by the supernova itself. Our observations strengthen the case for this double-degenerate SNIa progenitor channel, and motivate the search for more runaway SNIa donors.
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Pochtar’, A. A., I. G. Vasil’eva, and V. V. Malakhov. "Detecting spatial inhomogeneity manifestations in the chemical composition of functional materials by stoichiographic methods." Journal of Structural Chemistry 55, no. 6 (November 2014): 1160–65. http://dx.doi.org/10.1134/s0022476614060262.

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Chen, Kai, Libing Bai, Yifan Chen, Yuhua Cheng, Shulin Tian, and Peipei Zhu. "Defect Automatic Identification of Eddy Current Pulsed Thermography." Journal of Sensors 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/326316.

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Eddy current pulsed thermography (ECPT) is an effective nondestructive testing and evaluation (NDT&E) technique, and has been applied for a wide range of conductive materials. Manual selected frames have been used for defects detection and quantification. Defects are indicated by high/low temperature in the frames. However, the variation of surface emissivity sometimes introduces illusory temperature inhomogeneity and results in false alarm. To improve the probability of detection, this paper proposes a two-heat balance states-based method which can restrain the influence of the emissivity. In addition, the independent component analysis (ICA) is also applied to automatically identify defect patterns and quantify the defects. An experiment was carried out to validate the proposed methods.
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Dissertations / Theses on the topic "Material inhomogenity detection"

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Kulkarni, Raghavendra B. "Inverse problems solution using spectral finite element methods." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5471.

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Inverse problems are very challenging as these problems involve, finding the cause by analyzing the effects. In structural dynamics problems, the effects are normally measured in terms of dynamic responses in structures. These responses which are used to find the cause generally have partial data, embedded with measurement noise, and are truncated. Due to these problems, inverse problems are generally ill-posed in most cases as against forward problems. In this dissertation, we solve five different types of inverse problems involving high-frequency transient loads. All these problems are solved using the time-domain spectral element method (TSFEM) along with experimental or numerically simulated responses. The dissertation starts with the formulation of the forward problem, which is obtaining the responses from known input forces. The general formulation of TSFEM of composite Timoshenko beam is derived. The isotropic beam formulation is shown as a special case in this formulation. Five different inverse problems solved in the thesis are: 1. Force identification problem: A new algorithm is developed using a 1-D waveguide, involving an eight noded spectral finite element. The force identification is carried out, using a few measured responses on the structure, and using TSFEM we reconstruct the input force. This is followed by a portal frame example to demonstrate the wave reflection complexities. New procedures are developed to use various types of response data like displacement, velocity, acceleration, and strain to identify the force. 2. Material identification problem: A new procedure making use of the developed TSFEM, few responses, and nonlinear least square techniques are used to determine the material properties. Also, we show the case, in which we derive the material properties without force input consideration. 3. Crack location detection problem: A new procedure is developed using TSFEM and mechanics of crack. Three methods are described, in which the first method uses only responses and wave speeds to determine the location of the crack. In the second method, force reconstruction using the measured responses is carried out and this, in turn, is used to determine the location of the crack. The third method uses the residues of the actual force and the reconstructed forces using the healthy beam matrices and cracked beam responses. A new procedure to identify the crack location using a general force input pulse having many frequency components is also developed. 4. Material defect identification: Material defects like voids or density changes are identified using TSFEM. Location and magnitude of defect are identified using response computation and using the method of residues. 5. Porous location and identification in a composite material: TSFEM is used to construct a porous element and this is used along with a healthy beam to generate the responses. A force reconstruction algorithm is used to identify the location of the porous element. The Force residue method to identify the location of the defect is also demonstrated. Further, we make use of the material identification algorithm with a few modifications to evaluate all the parameters for the porous element.
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Conference papers on the topic "Material inhomogenity detection"

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Wan, Siew Kan, Zhixiong Guo, and Sunil Kumar. "Rapid Diagnosis of Inhomogeneity in Turbid Media." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-41576.

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In this work, a novel approach is proposed that would be able to rapidly diagnose the presence and location of inhomogeneity in turbid media. In this approach, ultrafast pulse laser is used as a detecting source and the time-resolved backscattered light signals are collected around the boundary of the target. The log slopes in the decaying log tail of the detected signals will be analyzed and used for the detection and image of embedded inhomogeneity. The relatively high absorption in the foreign object will result in a steeper log slope when the detector is located close to the object. A slim graphite of 1.6 mm in diameter embedded in a tissue phantom has been successfully detected in a preliminary experiment and the location of the graphite is determined from the v-groove profile of log slopes. A Monte Carlo program has been developed to further simulate and investigate the feasibility and quality of this method to diagnose the presence of a tumor-like material embedded inside a highly scattering media. A 2D reconstructed image confirms the potential of this novel method to detect and image accurately and rapidly the presence of tumors in biological tissues.
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Cunha, Andre, M. Frieman, Emmett N. Leith, J. Lopez, E. Reid, and K. Silverman. "Scanning imaging system using coherent-incoherent filtering techniques." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thm4.

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We describe and analyze a system comprising a confocal scanning system, a coherent spatial filtering system, followed by detection, and then a second spatial filtering system. In this method, an object is embedded in an inhomogeneity, in particular, a diffusing material. A point source of light scans across the front surface of the diffuser. Transmitted light illuminates the object, embedded within the diffuser. The light emerging from the diffuser is imaged onto a detector, in front of which is a slit that moves in synchronism with the illuminating beam, or alternatively, the inhomogeneity object structure moves in synchronism with the photographic emulsion. Since the illuminating source is coherent and remains so during its passage through the diffusing material, a coherent spatial filtering operation is possible and is performed at the focal plane of the first imaging lens. The emerging light falls on a detector, which could be a photographic plate, or preferably, a real time recording material such as a liquid or photorefractive crystal device. The detector thus makes a coherent-to-incoherent conversion. The next step is to undo the blurring effect of the diffuser process by a restoration filter that is essentially of a high pass nature. Because of the recording process, the overall process is not linear; thus, the restoration process may not, in general even in a noise-free system, lead to a perfect reconstruction.
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Kushibiki, J., H. Asano, T. Ueda, and N. Chubachi. "Application of Line-Focus-Beam Acoustic Microscope to Inhomogeneity Detection on SAW Device Materials." In IEEE 1986 Ultrasonics Symposium. IEEE, 1986. http://dx.doi.org/10.1109/ultsym.1986.198835.

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Kryszewski, Marian, and Grzegorz W. Bak. "Detection of structural inhomogeneity in graded-index polymer materials by space charge measurements: numerical solutions." In International Conference on Dielectric and Related Phenomena '98, edited by Andrzej Wlochowicz. SPIE, 1999. http://dx.doi.org/10.1117/12.373692.

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Fadeeva, Irina I., Nataliya V. Yurkevich, and Alexey N. Fage. "Application of electrical tomography to detecting of spreading substance from a dump in aquifers sand in laboratory condition." In Недропользование. Горное дело. Направления и технологии поиска, разведки и разработки месторождений полезных ископаемых. Экономика. Геоэкология. Федеральное государственное бюджетное учреждение науки Институт нефтегазовой геологии и геофизики им. А.А. Трофимука Сибирского отделения Российской академии наук, 2020. http://dx.doi.org/10.18303/b978-5-4262-0102-6-2020-072.

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The paper presents measurements of resistivity changes in homogeneous medium (water–saturated sand) with spherical inhomogeneity made from the substance of sulfide waste from gold mining (Talmovka dump, Kemerovo region) performed in a laboratory. Repeated resistivity measurements over single profile in time domain show the process of pore solution spreading (diffusion) from the waste material to the water–saturated sand and its further neutralization. The time–varying resistivity data is processed in Res2Dinvx64 program with a time–lapse survey option.
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