Development and Characterization of hybrid thermoplastic composites

This work is aimed at studying the possibility of using interply hybrid woven thermoplastic semi-pregs in secondary structures in aircrafts at TenCate Advanced Composites, Netherlands and Purdue University. Three different interply hybrids were designed from combination of Cetex © carbon-PPS semi-preg, Owen corning’s woven glass with PPS sheets and discontinuous chopped Cetex © carbon-PPS semi-preg to get desired flexural, out of plane and bearing properties. The design calculations are done based on classical laminate theory and the selection of materials to be used with carbon-PPS was done based on cost and availability. The Hybrid laminate performances are analyzed and compared to the conventional Cetex © Carbon-PPS semi-preg laminates. Observations are reported on three point bend test (European standard 2562), four point bend test(ASTM D6415-99) and bearing test (Airbus standards AITM 1-0009) for the laminates and it was found that hybrid laminates show a reduction of 5-10% in bending stiffness, 20-40% reduction in out-of-plane strength and 2-5%reduction in bearing with a cost reduction of 20-30%. The research identifies and documents the different factors responsible for failures and reduction in strength in the Hybrids

Mucoepidermoid Carcinoma Of Thyroid Gland: A Rare Case Report

Introduction: Mucoepidermoid carcinoma is a common neoplasm of the salivary gland but can also occur in other sites like oesophagus, breast, lungs, pancreas, etc .In thyroid gland it is very uncommon or rare and is said to be of low grade indolent neoplasm. In literature few cases have been reported.Case report: 43 year old female presented with progressive midline swelling since 20 years with alteration in voice since two months. CT revealed heterogeneous enhancing lesion of 35x50x37 mm in left lobe of thyroid. FNAC revealed epithelial malignancy. Total thyroidectomy was done and specimen sent for histopathology.Result: Microscopically the tumor showed cells arranged in follicular and trabecular pattern. These tumors cells were of columnar and mucin producing type arranged in glandular pattern. Some of the cells show squamous metaplastic changes. These glands or follicles lack colloid. Final diagnosis of mucoepidermoid carcinoma of thyroid was given.Conclusion: Mucoepidermoid Carcinomaof thyroid is low grade neoplasm which extends into  ajjacent tissue by local infiltration and unlikely to metastasize, hence progress is good. It can also have agressive behaviour and hence a through search to be done histologically and also rule out other metastatic lesions

Induction Motor Faults and Artificial Intelligence Based Conditioning and Monitoring Techniques

Three phase induction motors have been intensively utilized in industrial applications, mainly due to their efficiency and reliability. These motors have good properties such as increased stability, robustness, durability, large power to weight ratio, low production costs and controllability easiness. All machines realize various stresses during operational conditions. These stresses might lead to some modes of failures or faults. Condition monitoring is necessary in order to prevent faults. These faults, are necessary to be identi?ed and categorized, as soon as possible as they can end up in serious damages if not detected in due time. Different techniques of fault monitoring for induction motors are broadly classified as techniques based on model, signal processing, and soft computing. In recent years the monitoring and fault detection of electrical machines have moved from traditional techniques to Artificial Intelligence (AI). In this paper an attempt has been made to review different faults on induction motors and the applications of neural/fuzzy artificial intelligence techniques for induction motor condition monitoring. A brief description of various AI techniques highlighting the merits and demerits of each has been discussed. The futuristic trends on condition monitoring of induction motors are also indicated

Ab initio no-core shell model study of neutron-rich 18,19,20^{18,19,20}C isotopes

We implement the ab initio no-core shell model approach to study neutron-rich $^{18}$C, $^{19}$C and $^{20}$C isotopes. For this purpose, we employ charge-dependent Bonn 2000 (CDB2K), inside non-local outside Yukawa (INOY) and chiral next-to-next-to-next-to-leading order (N$^{3}$LO) nucleon-nucleon interactions. Low-lying energy spectra, electromagnetic properties and point-proton radii for these nuclei up to basis space $N_{\rm max}$ = 4 are calculated. Binding energies obtained with INOY interaction are in better agreement with the experimental values as compared to other \textit{ab initio} interactions. We also show the behavior of ground state energy and point-proton radii with the NCSM parameters, $\hbar$$\Omega$ and $N_{\rm max}$. We report a strong sensitivity of the B(E2) values from the first excited $2^+$ to the ground state of $^{18}$C and $^{20}$C to the nuclear interaction. Shell model calculations with YSOX interaction are also performed, and corresponding results are compared with ab initio one.Comment: Nuclear Physics A 1029, 122565 (2023

Ab initio description of Si, P, S, Cl and Ar isotopes in sd-shell

In the present work, we have reported comprehensive study of the $sd$-shell nuclei in the range $Z = 14 - 18$ with neutron number varying from $N = 9$ to $N = 20$ using the microscopic effective valence shell interactions. These effective $sd$-shell interactions are developed using the ab initio no-core shell model wave functions and the Okubo-Lee-Suzuki transformation method. The valence shell effective interactions, which are used in this project, are N3LO, JISP16 and DJ16A interactions. For comparison, we have also performed shell model calculations with the empirical USDB interaction. Theoretically calculated shell model results are compared with the experimental data, to check the predictive strength of the microscopic interactions. It is found that the binding energies of the ground states are better reproduced with the DJ16A interaction as compared to other microscopic interactions. Spin-tensor decomposition of two-body interaction is presented to understand the contributions from central, vector and tensor components into these interactions. Electromagnetic properties of these isotopic chains have been studied. Spectroscopic strengths of $^{23}$Al($d$,$n$)$^{24}$Si are calculated for the newly performed experiment at NSCL. The beta-decay properties of $^{32}$Ar are also determined for recently available experimental data.Comment: 23 pages, 16 figure