Fabrication and Characterization of Hybrid Natural Fibre-Reinforced Sandwich Composite Radar Wave Absorbing Structure for Stealth Radomes

V. Antony Vincent,C. Kailasanathan,G. Ramesh,T. Maridurai,V. R. Arun Prakash 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6

Natural fibre based sandwich composite wave absorbing structures were prepared and characterized for stealth and radome applications. The principal aim of this research was to develop a novel sandwich radar wave absorbing composite structure and evaluating their wave transmission and flexural properties. Fibres such as wool, silk, E-glass, aramid and wave absorbing foams like balsa wood, PVC and PMI were used for making wave absorbing sandwich composites. The composites were prepared using autoclave vacuum bag degassing method followed by post curing at 120 °C. The radar wave transmission characteristics were investigated using stealth radomes by partially replacing the traditional E-glass and aramid fi bre structure with a frequency selective surface (FSS) with standard parameters. The free space measurement technique was used to examine the radar wave transmission characteristics in the X-band frequency range (8.2–12.4 GHz). Three point bending test also performed to identify the fl exural strength of sandwich composite setup to ensure the bending rigidity. A highest wave transmission of 87.7% at bandwidth 0.83 GHz in − 1 dB with flexural strength of 44.2 MPa was observed for sandwich composite type 3c, which contains aramid/epoxy composite + balsa wood + silk/epoxy structure. The SEM micrographs showed highly reacted and toughness improved matrix phase for type 3c composite sandwich.

Quality and Acceptability of Meat Nuggets with Fresh Aloe vera Gel

Rajkumar, V.,Verma, Arun K.,Patra, G.,Pradhan, S.,Biswas, S.,Chauhan, P.,Das, Arun K. Asian Australasian Association of Animal Productio 2016 Animal Bioscience Vol.29 No.5

Aloe vera has been used worldwide for pharmaceutical, food, and cosmetic industries due to its wide biological activities. However, quality improvement of low fat meat products and their acceptability with added Aloe vera gel (AVG) is scanty. The aim of this study was to explore the feasibility of using fresh AVG on physicochemical, textural, sensory and nutritive qualities of goat meat nuggets. The products were prepared with 0%, 2.5%, and 5% fresh AVG replacing goat meat and were analyzed for proximate composition, physicochemical and textural properties, fatty acid profile and sensory parameters. Changes in lipid oxidation and microbial growth of nuggets were also evaluated over 9 days of refrigerated storage. The results showed that AVG significantly (p<0.05) decreased the pH value and protein content of meat emulsion and nuggets. Product yield was affected at 5% level of gel. Addition of AVG in the formulation significantly affected the values of texture profile analysis. The AVG reduced the lipid oxidation and microbial growth in nuggets during storage. Sensory panelists preferred nuggets with 2.5% AVG over nuggets with 5% AVG. Therefore, AVG up to 2.5% level could be used for quality improvement in goat meat nuggets without affecting its sensorial, textural and nutritive values.

Guava (Psidium guajava L.) Powder as an Antioxidant Dietary Fibre in Sheep Meat Nuggets

Verma, Arun K.,Rajkumar, V.,Banerjee, Rituparna,Biswas, S.,Das, Arun K. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.6

This study was conducted to explore the antioxidant potential and functional value of guava (Psidium guajava L.) powder in muscle foods. Guava powder was used as a source of antioxidant dietary fibre in sheep meat nuggets at two different levels i.e., 0.5% (Treatment I) and 1.0% (Treatment II) and its effect was evaluated against control. Guava powder is rich in dietary fibre (43.21%), phenolics (44.04 mg GAE/g) and possesses good radical scavenging activity as well as reducing power. Incorporation of guava powder resulted in significant decrease (p<0.05) in pH of emulsion and nuggets, emulsion stability, cooking yield and moisture content of nuggets while ash and moisture content of emulsion were increased. Total phenolics, total dietary fibre (TDF) and ash content significantly increased (p<0.05) in nuggets with added guava powder. Product redness value was significantly improved (p<0.05) due to guava powder. Textural properties did not differ significantly except, springiness and shear force values. Guava powder was found to retard lipid peroxidation of cooked sheep meat nuggets as measured by TBARS number during refrigerated storage. Guava powder did not affect sensory characteristics of the products and can be used as source of antioxidant dietary fibre in meat foods.

A semiautomatic forest management approach using remote sensing techniques

P.V. Arun 한국산림과학회 2014 Forest Science And Technology Vol.10 No.1

Remote sensing satellite images are effectively used as a tool for decision making in various fields, especially in forestmanagement and related analyses. Different geospatial parameters are required for effective decision making and thepossibility of an integrated framework for automation of various analyses has been investigated. Advanced web miningand intelligent techniques have been adopted for the development of a comprehensive open-source framework for thispurpose. The effectiveness of the developed methodology has been discussed and illustrated with reference to study areasusing various statistical parameters. Adoption of a cellular neural network (CNN) for feature modeling and open-sourcedata for automatic mining seemed to be effective. The developed methodologies were found to outperform existing oneswith regard to accuracy and complexity. Investigations revealed that use of CNN is very effective in shape modeling, andimproves accuracy of detection.

Study of the Cooling Performance of a Mist-Type Regenerative Evaporative Cooler Under Different Feed Water Temperature

Arun B. S.,Mariappan V. 대한설비공학회 2020 International Journal Of Air-Conditioning and Refr Vol.28 No.2

In hot and humid climates, evaporative cooler is coupled with desiccant dehumidifier to obtain effective cooling. To realize the M-cycle-based cooler which combines liquid desiccant regeneration and evaporative cooling in a single apparatus, the effect of different feed water temperature on cooling performance is investigated in this paper. It was observed that wetting water film layer of conventional regenerative evaporative cooler (REC) carries a significant amount of sensible heat from the hot water/solution which reduced the wet-bulb effectiveness of the cooler. To enhance its effectiveness, an ultrasonic atomization mist REC was proposed. The influence of different intake conditions on cooling performance was studied and found that mist REC performed better than conventional cooler for higher feed water temperature. The wet-bulb effectiveness of the cooler ranged from 0.56 to 1.15 with maximum cooling capacity of 580[Formula: see text]W, which is comparable to the previous studies. This prototype can be further developed to an ultrasonic liquid desiccant waterless evaporative cooler.

Formulation, characterization and in vitro evaluation of herbal sunscreen lotion

Rasheed, Arun,Shama, S. Neelufar,Mohanalakshmi, S.,Ravichandran, V. 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.4

Natural substances extracted from plants have recently been considered as potential sunscreen resources owing to high ultraviolet ray absorption and antioxidant activity. The decrease in the intensity of UV radiation reaching the skin through sunscreens may reduce the risk of sun-induced skin cancer. The present study attempts to develop sunscreen lotions, possessing broad spectrum of anti-UV radiation effectiveness with reduced concentration of chemical UV filters, from the extracts of bioactive products such as Curcuma longa L. (Zingiberaceae), Aloe vera (Liliaceae) and Alpinia galanga Willd. The effectiveness of the product was evaluated using Sun Protection Factor (SPF). Curcumin was selected as potential bioactive agents due to their phytochemical compositions possessing considerable content of polyphenolic compounds and Alpinia galanga is used as key ingredient in various commercial sunscreen lotions as it has skin protectant action against UV rays and boosts the activity of conventional sunscreens. The sunscreen lotions were prepared using three different compositions F1, F2 and F3 and evaluated for their stability, safety and SPF. Results showed that the sunscreen lotions were non-mutagenic, non-irritant, stable and possess SPF for normal skin. The efficacy when tested with a standard was observed to be same as that of a marketed sunscreen with SPF 55 and SPF 20. From the present study, formulation F2 having curcumin extract was proved to be stable and effective with high SPF compared to F1 and F3.

Gender Differences in Influence of Socio-demographic Characteristics on Mode Choice in India

Taru SAIGAL,Arun Kr. VAISH,N.V.M. RAO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.1

The study aims to investigate differences between men and women in influence of various socio-demographic factors on choice of mode of transport. For this purpose, a binary logit model of choice probabilities is implemented on survey data of a developing country city. Results indicate women’s choice of travel mode to be more environment-friendly than that of men. Well-educated, working and middleaged individuals appear to be the most likely to choosing more-polluting modes of transport for frequent travelling purposes. Individuals in the sample who are the least socioeconomically well off are found the most likely to be promising for the environment. The findings of this study suggest the future transportation policies toward development of existing infrastructure of greener modes of transportation in the city such as, public transportation services and pedestrian lanes, so as to manage the rising issues of degrading environmental quality. The study highlights how the consideration and inclusion of socio-demographic factors is crucial for policy recommendation regarding curtailing the environmental damages contributed by transportation sector. Because mobility crucially affects all other indicators of empowerment, and women are the ones using green modes extensively, the city’s transportation system should be so developed which gives their safety and security due importance.

Effective Anomaly Identification in Surveillance Videos Based on Adaptive Recurrent Neural Network

Arul U.,Arun V.,Rao T. Prabhakara,Baskaran R.,Kirubakaran S.,Hussan M. I. Thariq 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

Surveillance systems completed in true environment are of a solid nature. As the environment is uncertain and variable, care gradually becomes confusing when moving away from a stable and controlled environment. Evidence to distinguish stressful abnormalities in video surveillance is a problematic issue due to leakage, video screaming, contradictions and motives. Hence, in this paper, adaptive recurrent neural network is developed for anomaly detection from the videos. The projected technique is a combination of recurrent neural network and crystal structure algorithm. In the anomality detection, the video should be changed into frames. After that, the images should be enhanced for improving image quality. Once, the image quality is enhanced, the image background should be eliminated for achieving object detection. In the proposed technique, the region of interest is utilized to attain the object detection step in the images. The detected object images are used to tracking the object in the images by using the proposed classifer. To enhance the object tracking system, the feature extraction is a required topic in the system. Maximally stable extremal regions is used to extract the required features from the images. Finally, the proposed classifer is utilized to achieve anomaly detection based on object movement in the input images. The projected strategy is implemented and evaluated by performance metrices. It is contrasted with conventional techniques such as convolutional neural network-particle swarm optimization (CNN-PSO) and CNN respectively.

Butterfly communities along an elevational gradient in the Tons valley, Western Himalayas: Implications of rapid assessment for insect conservation

Manish Bhardwaj,Abesh K. Sanyal,Arun P. Singh,V.P. Uniyal 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.2

As time and money is limited, explicit, cost-effective, quick, and appropriate methods are needed to assist conservation planners and managers for making quick decisions. Butterflies promise to be a good model for rapid assessment and habitat monitoring studies because they are widespread, conspicuous, and easily recognizable and they are effective indicators of forest health. We conducted a rapid assessment of butterflies at five disturbance gradient sites that varied in elevation from 900 m a.s.l. to 3500 m a.s.l. for 20 days during March–April 2010 and recorded 79 butterfly species and 1504 individuals in the Tons valley in Western Himalayas. We were able to sample approximately 77% (123 species) of the estimated species richness on continuing the sampling until July 2010. Species richness at the study site is estimated to be 159 (95% CI:145–210) species. Diversity was highest in heterogeneous habitats and decreased towards homogeneous habitats. Unique species were highly restricted to lowest disturbed sites. Using Pearson's correlation analysis,the strongest vegetative predictors of butterfly richness were plant species richness, canopy cover, and herb and shrub density. Butterfly species richness and abundance were highly correlated with altitude, temperature,relative humidity, fire signs, and livestock abundance. We also found positive cross-taxon correlation among butterflies, moths, and beetles across sites, indicating that butterflies can be used as surrogate or indicator taxa for insect conservation. Short sampling periods providing comprehensive estimates of species richness were reliable for identifying habitats and sites with the most conservation value in the Tons valley landscape.

Unraveling the swine genome: implications for human health.

Schook, Lawrence B,Collares, Tiago V,Darfour-Oduro, Kwame A,De, Arun Kumar,Rund, Laurie A,Schachtschneider, Kyle M,Seixas, Fabiana K Annual Reviews 2015 Annual review of animal biosciences Vol.3 No.-

<P>The pig was first used in biomedical research in ancient Greece and over the past few decades has quickly grown into an important biomedical research tool. Pigs have genetic and physiological traits similar to humans, which make them one of the most useful and versatile animal models. Owing to these similarities, data generated from porcine models are more likely to lead to viable human treatments than those from murine work. In addition, the similarity in size and physiology to humans allows pigs to be used for many experimental approaches not feasible in mice. Research areas that employ pigs range from neonatal development to translational models for cancer therapy. Increasing numbers of porcine models are being developed since the release of the swine genome sequence, and the development of additional porcine genomic and epigenetic resources will further their use in biomedical research.</P>