821 research outputs found

    Fabrication of Functionally Graded Material (FGM) Set-Up

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    Functionally graded materials (FGMs) are advanced composites with graded properties that are novel concepts in the structural design of materials and have extensive applications in the aerospace engineering, aircrafts and automotive industry. FGMs with the continuous variation of microstructures and properties are expected to have the reduction of residual and thermal stresses. In case of metal-ceramic FGMs advancement over heat and corrosion resistance of ceramics and mechanical strength of metals in such applications as thermal or chemical barriers. FGMs can also be designed to take.an improved adhesive bonding strength between metals and ceramics. Multifunctional metal-ceramic structures are suitable for applications where toughness and hardness are two essential requirements for engineering and scientific research applications. The objective of the research paper is to fabricate graded metal-ceramic composites in bulk manufacturing processes for commercial applications. This paper aims at control of the evolution of mechanical properties through the use of a nanoparticle sintering aid and fabrication of graded metal-ceramic composites using pressureless sintering and bulk molding technology. A new sintering aid TiO2 was introduced to control the evolution of mechanical properties of graded Nickel-Alumina composites. The evolution of mechanical properties was then used in a recently developed two-dimensional micro thermo-mechanical analysis to determine the effects of develop gradient architectures. Finally, a laboratory-scale FGM setup is designed based on a powder metallurgy (PM) and Rapid Prototyping (RP) technology to process geometrically complex gradient structures

    An Insight Into Indian Tourism Sector

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    Researchers have observed that Indian Tourism is a potential source of employment generation which will help in sustainable development of the country. India exploits around 0.6% from the world tourism sector which contributes around 6.23% to the country GDP presently. Blessed with a lot of tourist destinations rooted in the hill stations, waterfalls, historic places, artistic craftsmanship and temples of all religions, it has not been able to become the cynosure for the citizens across the world. The reasons could be attributable to inadequate tourism information, relatively inadequate growth of hotel and travel industry etc. Under the backdrop of such issues, this paper while putting an insight into the development of tourism in India will make an attempt to examine the place of India in The World Tourism map

    FORMULATION AND EVALUATION OF ORODISPERSIBLE TABLETS OF GRANISETRON HYDROCHLORIDE USING PLANTAGO OVATE AS NATURAL SUPERDISINTEGRANTS

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    The main objective of the study was to develop orodispersible tablets of Granisetron hydrochloride, a selective 5-HT3 receptor antagonist (an antivomiting agent) for improving patient compliance, especially those of paediatric & geriatric categories with difficulties in swallowing. In the wet granulation method orodispersible (ORD) tablets were prepared using natural super disintegrants  plantago ovate.The prepared batches of tablets were evaluated for weight variation, hardness, friability, wetting time, in vitro dispersion time, drug content and in vitro dissolution studies. The tablet formulation batch F4 was considered as the overall best formulation (with an in vitro drug release study of 99.11%).Short term stability studies (at 40±2ºC/75±5% RH) on the best formulation indicated that there no significant changes in drug content. From the Fourier Transform Infrared (FTIR) spectroscopy study indicated that there are no drug excipient interactions. Key words:  Granisetron hydrochloride, Orodispersible tablets, FTIR spectroscopy, in vitro drug release study

    Harnessing the power of nutritional antioxidants against adrenal hormone imbalance-associated oxidative stress

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    Oxidative stress, resulting from dysregulation in the secretion of adrenal hormones, represents a major concern in human health. The present review comprehensively examines various categories of endocrine dysregulation within the adrenal glands, encompassing glucocorticoids, mineralocorticoids, and androgens. Additionally, a comprehensive account of adrenal hormone disorders, including adrenal insufficiency, Cushing’s syndrome, and adrenal tumors, is presented, with particular emphasis on their intricate association with oxidative stress. The review also delves into an examination of various nutritional antioxidants, namely vitamin C, vitamin E, carotenoids, selenium, zinc, polyphenols, coenzyme Q10, and probiotics, and elucidates their role in mitigating the adverse effects of oxidative stress arising from imbalances in adrenal hormone levels. In conclusion, harnessing the power of nutritional antioxidants has the potential to help with oxidative stress caused by an imbalance in adrenal hormones. This could lead to new research and therapeutic interventions

    Linear Stability of Triangular Equilibrium Points in the Generalized Photogravitational Restricted Three Body Problem with Poynting-Robertson Drag

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    In this paper we have examined the linear stability of triangular equilibrium points in the generalised photogravitational restricted three body problem with Poynting-Robertson drag. We have found the position of triangular equilibrium points of our problem. The problem is generalised in the sense that smaller primary is supposed to be an oblate spheroid. The bigger primary is considered as radiating. The equations of motion are affected by radiation pressure force, oblateness and P-R drag. All classical results involving photogravitational and oblateness in restricted three body problem may be verified from this result. With the help of characteristic equation, we discussed the stability. Finally we conclude that triangular equilibrium points are unstable.Comment: accepted for publication in Journal of Dynamical Systems & Geometric Theories Vol. 4, Number 1 (2006

    Mechanochemical synthesis of a new triptycene-based imine-linked covalent organic polymer for degradation of organic dye

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    In the present work, a novel triptycene-based imine-linked covalent organic polymer (TP-COP) was designed and synthesized via room-temperature, solvent-free mechanochemical grinding. The as-synthesized TP-COP material was fully characterized by Fourier transform infrared spectroscopy, solid-state NMR, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller method, thermogravimetric analysis, diffuse reflectance spectroscopy (DRS), and electron paramagnetic resonance (EPR). The HRTEM image of TP-COP clearly indicates the presence of graphene-like layered morphology (exfoliated layers). The DRS study reveals that TP-COP exhibited a low optical band gap value of 2.49 eV, implying its semiconducting nature. Further, the EPR study confirmed the semiconducting behavior of TP-COP through the generation of free radicals. These findings suggest that TP-COP could be used as an efficient photocatayst for the degradation of organic dye (RhB) under solar irradiation. Moreover, TP-COP showed excellent reusability in degrading dye (RhB) without obvious performance decay

    Samanantar: The Largest Publicly Available Parallel Corpora Collection for 11 Indic Languages

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    We present Samanantar, the largest publicly available parallel corpora collection for Indic languages. The collection contains a total of 49.7 million sentence pairs between English and 11 Indic languages (from two language families). Specifically, we compile 12.4 million sentence pairs from existing, publicly-available parallel corpora, and additionally mine 37.4 million sentence pairs from the web, resulting in a 4x increase. We mine the parallel sentences from the web by combining many corpora, tools, and methods: (a) web-crawled monolingual corpora, (b) document OCR for extracting sentences from scanned documents, (c) multilingual representation models for aligning sentences, and (d) approximate nearest neighbor search for searching in a large collection of sentences. Human evaluation of samples from the newly mined corpora validate the high quality of the parallel sentences across 11 languages. Further, we extract 83.4 million sentence pairs between all 55 Indic language pairs from the English-centric parallel corpus using English as the pivot language. We trained multilingual NMT models spanning all these languages on Samanantar, which outperform existing models and baselines on publicly available benchmarks, such as FLORES, establishing the utility of Samanantar. Our data and models are available publicly at https://indicnlp.ai4bharat.org/samanantar/ and we hope they will help advance research in NMT and multilingual NLP for Indic languages.Comment: Accepted to the Transactions of the Association for Computational Linguistics (TACL

    Mechanochemical synthesis of a new triptycene-based imine-linked covalent organic polymer for degradation of organic dye

    Get PDF
    In the present work, a novel triptycene-based imine-linked covalent organic polymer (TP-COP) was designed and synthesized via room-temperature, solvent-free mechanochemical grinding. The as-synthesized TP-COP material was fully characterized by Fourier transform infrared spectroscopy, solid-state NMR, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmett-Teller method, thermogravimetric analysis, diffuse reflectance spectroscopy (DRS), and electron paramagnetic resonance (EPR). The HRTEM image of TP-COP clearly indicates the presence of graphene-like layered morphology (exfoliated layers). The DRS study reveals that TP-COP exhibited a low optical band gap value of 2.49 eV, implying its semiconducting nature. Further, the EPR study confirmed the semiconducting behavior of TP-COP through the generation of free radicals. These findings suggest that TP-COP could be used as an efficient photocatayst for the degradation of organic dye (RhB) under solar irradiation. Moreover, TP-COP showed excellent reusability in degrading dye (RhB) without obvious performance decay
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