Seminar by MSc. Dinh Cong Du, MSc. Le Tri Dat, and BSc. Thai Quynh Mai

On June 16, 2023, the lecture from MSc. Dinh Cong Du, MSc. Le Tri Dat, and BSc. Thai Quynh Mai talk place in meeting hall 5 of library.

MSc. Dinh Cong Du presents a talk entitled "A model updating procedure based on expansion of incomplete frequency response function data for probabilistic damage identification of FGM beams"

Abstract:

In this seminar, a probabilistic damage identification approach for functionally graded materials (FGM) structures using model updating procedure based on expansion of incomplete frequency response function (FRF) data with measurement noise is presented. The model updating procedure is formulated as an optimization scheme which is accomplished by minimizing a cost function based on the changes in expanded FRF data. Herein, we perform the expansion of incompletely measured FRFs using an iterative order reduction method, rendering the identification resistant to the adverse effects of measurement noise. For the minimization process, bald eagle search algorithm (BES) which has not yet been tested in the field of model updating is adopted. Based on the statistical distributions of the identified stiffness parameters in the damaged and undamaged states, the probability of damage existence (PDE) is established. The performance of the proposed model updating procedure is verified using FGM beam structures. The statistical results indicate that under a high level of noise (15%), the proposed procedure can provide the prediction of damage localization with a high level of confidence and yield damage estimation results with acceptable errors.

MSc. Le Tri Dat presents a talk entitled "Investigate of sensitivity of overhang and T-shaped cantilevers under tip-sample interaction"

Abstract:

In this report, we investigate the sensitivity of T-shaped and overhang-shape microcantilevers through tip-sample. The sensitivity of the beam presents a change in frequency under external conditions and is a key factor of crucial interest in measurement technologies. Many efforts are attempting enhancement sensitivity with many various methods. Here, we consider the ability of a width-varying cantilever which adjusts resonance frequencies and from that increasing of the sensitivity. This work can provide a new approach to designing, and fabricating when using width-varying cantilevers in sensing and imaging applications.

BSc. Thai Quynh Mai presents a talk entitled "The influence of Lobaric acid on the ovaries of rats exposed to Tetramethrin"

Abstract:

Tetramethrin (T m ) is a pesticide that can reduce the fertility of some animals and humans. Thus, the assessment of the estrous cycle in rodents is an essential measure of the biochemical effects of T m as well as the nature of the toxic insult on the reproductive system. Lacboric acid has been reported for its multiple bioactivities such as anti-inflammatory and anti-gout, menstrual disorders, vaginal discharge and swelling of female genitalia. Therefore, in this study, the incorporation of Lacboric acid into T m -exposed rats was performed. As an antagonist, Lacboric acid significantly ameliorated the toxic effects induced by T m. Observation results indicated that Lacboric acid is a potential candidate in the management of insecticide induced alterations of the reproductive cycle of rodents.