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Instability Regions of a laminated Sandwich Plate with MRE Core Under Parametric Excitation Using Finite Element Method
Get PDFThis paper is concerned with the instability regions of a laminated sandwich plate with magneto-rheological elastomer (MRE) core under periodic axial loads. Structures operating under this unstable region cause large response even if the excitation force is small in magnitude. The governing equations of motion of the system are obtained by using finite element method [FEM].The parametric stable and unstable regions of the MRE cored composite sandwich plate for different system parameters and end constraints are found using modified Hsu method for simple parametric resonance condition. This analysis will help to design passive attenuation by using sandwich plates of varied dimensions, material parameters of both skin and core. Further active vibration reduction is possible by applying suitable magnetic field and operating the system outside of the instability region
Pulsatile flow of Jeffrey hybrid nanofluid in a vertical channel with entropy generation
Get PDFThis study examines the hydrodynamic pulsatile flow of Jeffrey hybrid (Au+Al2O3/Blood) nanofluid in a vertical channel with entropy production. The literature shows that the investigations are only related to the pulsating flow of nanofluid. Any study related to the pulsating flow of Jeffrey hybrid nanofluid in a vertical channel with Joule heating, thermal radiation, and heat source/sink did not report so far. The novelty of the present work is the investigation of entropy generation on pulsatile flow of Jeffrey hybrid nanofluid with Joule heating, thermal radiation and heat source/sink effects in a vertical channel. The transformation of the governing partial differential equations into a system of ordinary differential equations are made by applying the perturbation method and then numerically solved by fourth-order Runge-Kutta method aided by bvp4c shooting technique built-in MATLAB software. This work is useful for chemical engineering, blood cancer treatment, nanodrug delivery, pharmaceutical process, and biomedical aspects.The effects of various emerging parameters and variables on velocity, temperature, entropy generation, and the Bejan number are displayed through graphs. The consequences of physical parameters on heat transfer rate are prearranged in a table. This analysis demonstrates that the temperature of hybrid nanofluid increases with an increment in radiation parameter, and Eckert number. The entropy generation is an increasing function of Eckert number and radiation parameter whereas it decelerates with a rise in Hartmann number. The heat transfer rate has a higher impact in the case of (Au+Al2O3/Blood) hybrid nanofluid as compare to mono nanofluid
Mechanical, sound absorption and thermal properties of cork fabric
Get PDFThis study focuses on two different kinds of cork leathers that are environment friendly and represent as an important sustainable alternative to leather. The general properties of cork leather have been investigated in this study to highlight their potential use as coated-textile structures. The potential use of cork fabrics as technical textiles is also discussed to promote the use of technical textiles, such as buildtech and automotive textiles. The sound absorption and thermal properties of the cork structures are tested and compared with those of reference lamb leather. It is found that the developed cork-based structures have promising mechanical, thermal, and sound absorption properties for further application
From synthesis to bioactivity: A comprehensive study of Cu-based biocidal tool
Get PDFThe present study reports on the biogenic synthesis of a copper-based biocidal material through the fermentation of gruel, a traditional non-alcoholic beverage. This process may involve a bio-beneficiation mechanism, in which the indigenous microorganisms in the ferment interact with the material. X-ray diffraction analysis confirmed the powder's crystalline copper composition. Fourier-transform infrared spectroscopy revealed the crucial role of organic acids in the capping process. Transmission electron microscopy, ultraviolet-visible spectroscopy, and antimicrobial susceptibility tests were conducted to characterize the powder. Furthermore, the biocidal material was combined with the anticancer drug curcumin to explore its additional anti-proliferative effects, including apoptosis, on human hepatocellular carcinoma cell lines in vitro. These findings highlight the potential of this biogenic copper material as a promising candidate for biomedical applications
Efficacy of herbal extracts in alleviating corm dormancy in gladiolus (Gladiolus grandiflorus L.)
Get PDFBeing one of the most sought-after crops as a cut flower for borders, decoration and display, gladiolus is in high demand among flower lovers. In order to boost planting of freshly harvested corms which is hindered by presence of dormancy, several herbal extracts have been investigated on different varieties of gladiolus along with the commercially used chemical GA3. Among all the treatments, Azadirachta indica (Neem) extract at 2% came out as most effective treatment in improving corm sprouting parameters and was also found to be statistically at par with GA3 at 100 ppm. Among varieties, V2 (Morning Gold) was found to be most responsive variety under the effect of herbal extracts. Through this study it was indicated that natural plant products which are environmentally sound and safe to use can be used as alternatives to chemicals used in breaking the dormancy of gladiolus and expanding its limits of cultivation.
Evaluation of different traditional rice landraces for its bioactive compounds
Get PDFIn recent decades, the medicinal values of traditional landraces have been of great interest and the cultivation is being revamped among the farmers of Tamil Nadu. The present investigation was aimed to analyse the phytonutrients, antioxidants and functional groups among the six traditional land races. Phytochemical analysis revealed that the pigmented traditional landraces of rice possessed more antioxidant properties. The traditional rice varieties, especially Mapillai samba was found to be superior in terms of moisture (11.5±0.16%) and total ash (1.71±0.14%), Kuzhiyadichan in protein (9.65±0.67%) and fat (2.53±0.17%), Iluppaipoo samba in carbohydrate (79.3±1.29) and energy (1525±24.8 kJ). Kuzhiyadichan had highest phosphorous (359±24.7), calcium (46.8±3.23), magnesium (135±9.30), iron (5.70±0.39) and zinc (2.70±0.19) content, whereas copper (0.353±0.02), manganese (0.965±0.06) and potassium (296±23.5) content was higher in Seeraga samba, Kichali samba and Mapillai samba, respectively. The studies revealed that Mapillai samba got the highest total phenols (39.25±0.88 mg), vitamin E (27.76±2.39), anthocyanins (45.2±0.16) and antioxidant activity (764±21.3) followed by Iluppaipoo samba among traditional rice varieties. FTIR analysis revealed the distribution of biochemically different phenols, carbohydrates, hydroxyl and amide groups. Traditional landraces can be used as a source of antioxidants and nutraceuticals. This finding confers new facet in rice breeding to develop a nutraceutical rich rice and to enhance the farmers production in order to meet the demand of food-based medicines
Assessment of in vivo wound healing potentiality of Trapa natans L. leaves on different wound models in rat
Get PDFThe primary goal of this study was to assess the wound healing potentiality of Trapa natans L. Excision and incision models were used to evaluate wound healing activity. For the excision model experiment was conducted for 21 days and for the incision model experiment continued for 10 days. Experimental animals were divided into four groups, the control group received simple ointment, the animal of the standard group treated with 0.2% w/w soframycin ointment, and the test groups received T. natans extract ointment (2.5% w/w & 5% w/w). Wound healing was determined by the rate of contraction, the time required for epithelization, collagen cell formation, the amount of hydroxyproline present in the wound site, and wound-breaking strength. Experimental results of the test showed a comparatively higher rate of contraction, lesser epithelization period, and higher hydroxyproline amount present in the wound area. These results were strengthened by the histopathological studies of the healing area tissues. When the standard and test groups were compared to the control group, statistically significant data were found (p<0.001). The test group had better wound-healing properties as compared to the control group. From the result of this study, it was revealed that T. natans L. is an excellent herbal alternative for treating wounds.
Development and production of cowpea inoculated with Bradyrhizobium strains in a traditional cultivation system in Southwestern Amazonia
Get PDFTraditional cowpea cultivars are conserved in the Juruá Valley (Acre) by farmers who adopt a "beach" production system, in lowland areas on the banks of the Juruá River and tributaries. Cowpea inoculation is a sustainable and low-cost technique that has provided an increase in the growth and productivity of the crop, but that has not yet been tested in this production system. The objective of this work was to evaluate the development and production of cowpea inoculated with Bradyrhizobium strains in a traditional cultivation system in Southwestern Amazonia. A randomized block design with three replications and four treatments was used: seeds inoculated with strains BR 1808, BR 3262, and BR 3267, and a control without inoculation. Inoculation provided an increase in the majority of the studied variables. The productivity obtained in the treatments with BR 3262 and BR 1808 was superior to the other treatments. The strain BR 3262 showed higher levels of total chlorophyll and nitrogen. Inoculation with Bradyrhizobium proved to be a promising technology for the cultivation of cowpea beans in lowland soils of the Juruá River.
Therapeutic potential of endophytic bacteria from ethnomedicinal plants used by the traditional healers of North East India
Get PDFNorth East Indian Himalayan Region (NEIHR) is endowed with a diverse ecosystem. The indigenous people of this region have good traditional knowledge to combat various diseases and physical ailments using ethnomedicinal plants that were gained through experience over years. Some of the plants have been incorporated in the conventional medicines. However, many of the plants have not been scientifically explored since they remain endemic to a particular region and the traditional healers kept it as secret knowledge. The majority of the endophyte of NEIHR belongs to genus Acinetobacter, Bacillus, Microbacterium, Pseudomonas, Serratia, and Streptomyces. Endophytic bacteria exhibit antimicrobial activities against important human pathogens such as Escherichia coli, Pseudomonas aeruginosa, Salmonella enterica, Streptococcus pyogenes, Staphylococcus aureus, etc. Bioactive strains display potential anticancer and antioxidant activities. This review also incorporates some of the potential unexplored medicinal plants used by the ethnic population of this region for treating common diseases and the importance of exploring bioactive compounds from the associated bacteria. It will also highlight the prospects of discovering novel bioactive compounds that will have a new and novel mechanism of actions for combating the drug resistant pathogens.