Photonic switching in III/V nanostructures

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Indian Scientists Making Snake Robot for Search and Rescue Missions

"When deployed in a search and rescue operation or a surveillance mission (defence-related), snake robots communicate with each other and with a central station from a cyber-physical system through various sensors such as video camera, GPS, Infrared and ultrasonic range finders," Kumar said

FACE RECOGNITION IN EIGEN DOMAIN WITH NEURO-FUZZY CLASSIFIER AND EVOLUTIONARY OPTIMIZATION

Face Recognition is a nascent field of research with many challenges. The proposed system focuses on recognizing faces in a faster and more accurate way using eigenface approach and genetic algorithm by considering the entire problem as an optimization problem. It consists of two stages: Eigenface approach is used for feature extraction and genetic algorithm based feed forward Neuro-Fuzzy System is used for face recognition. Classification of face images to a particular class is done using an artificial neural network. The training of neural network is done using genetic algorithm, a machine learning approach which optimizes the weights used in the neural network. This is an efficient optimization technique and an evolutionary classification method. The algorithm has been tested on 200 images (20 classes). A recognition score for test lot is calculated by considering almost all the variants of feature extraction. Test results gave a recognition rate of 97.01%

Working and Limitations of Cable Stiffening in Flexible Link Manipulators

Rigid link manipulators (RLMs) are used in industry to move and manipulate objects in their workspaces. Flexible link manipulators (FLMs), which are much lighter and hence highly flexible compared to RLMs, have been proposed in the past as means to reduce energy consumption and increase the speed of operation. Unlike RLM, an FLM has infinite degrees of freedom actuated by finite number of actuators. Due to high flexibility affecting the precision of operation, special control algorithms are required to make them usable. Recently, a method to stiffen FLMs using cables, without adding significant inertia or adversely affecting the advantages of FLMs, has been proposed as a possible solution in a preliminary work by the authors. An FLM stiffened using cables can use existing control algorithms designed for RLMs. In this paper we discuss in detail the working principle and limitations of cable stiffening for flexible link manipulators through simulations and experiments. A systematic way of deciding the location of cable attachments to the FLM is also presented. The main result of this paper is to show the advantage of adding a second pair of cables in reducing overall link deflections

On The Center Sets and Center Numbers of Some Graph Classes

For a set $S$ of vertices and the vertex $v$ in a connected graph $G$, $\displaystyle\max_{x \in S}d(x,v)$ is called the $S$-eccentricity of $v$ in $G$. The set of vertices with minimum $S$-eccentricity is called the $S$-center of $G$. Any set $A$ of vertices of $G$ such that $A$ is an $S$-center for some set $S$ of vertices of $G$ is called a center set. We identify the center sets of certain classes of graphs namely, Block graphs, $K_{m,n}$, $K_n-e$, wheel graphs, odd cycles and symmetric even graphs and enumerate them for many of these graph classes. We also introduce the concept of center number which is defined as the number of distinct center sets of a graph and determine the center number of some graph classes

CLINICO – MYCOLOGICAL PROFILE OF DERMATOPHYTIC INFECTIONS

Objective: The objective of this study was to isolate and identify the dermatophytic infected patients attending Perunduarai IRT Medical College and Hospital, Erode.Methods: The samples of skin, nail and hair from patients having the sign of superficial mycoses were gathered over a period of one year. The clinical material was examined microscopically by KOH mount and the culture was done on Sabouraud dextrose agar, Potato dextrose agar Dermatophyte test agar medium and incubated at 28-30 °C.Results: The demographic data shows that the men (82%) were highly susceptible to the infection; the infected age group is between 15-30 y (74%). In that students, (28%) were highly exposed to Tinea corporis and Tinea cruris infection.Conclusion: The results of the study suggested that the preliminary information on the prevalence and distribution of dermatophytes in the area of sampling. So the knowledge of the efficient screening, management, reduction and treatment of the dermatophytic infection should be fruitful in the future.Keywords: Skin, KOH mount, Dermatophyte test medium (DTM), Tinea cruri

ISOLATION AND IDENTIFICATION OF ENDOPHYTIC FUNGI FROM TERMINALIA CHEBULA OF EASTERN GHATS, TAMILNADU

Objective: Endophytic fungi live inside the higher plants, apparently without causing any harm to the hosts and its produce the secondary metabolites are potential antimicrobial activity. Terminalia chebula has been used in Ayurveda, Unani & Homeopathy medicine. In this study an isolate and identify the endophytic fungi from T. Chebula collected from pachamalai hills of the Eastern Ghats, Tamilnadu.Methods: The plant materials were taken and first rinsed in running tap water to remove the dust and the other debris present in it. Segments of approximately 0.5 cm were cut in sterile lancet blades and surface sterilized by agitating in 70% ethanol (5s), followed by treatment with 4% NaOCl (90s) and then rinsed in sterile distilled water (10s).Thirty six (leaf, stem and fruit samples) segments from T.chebula plant are processed for the isolation of endophytic fungi.Results: About 36 segments (12 segments of each part respectively) of the medicinal plant were screened for the isolation of the endophytic fungi. A total of 27 endophytic fungi was isolated and identified from medicinal plant T.chebula. The leaf segments showed a maximum repository for endophytic fungi than the other segments. Among the 27 endophytic fungi, the predominant endophytic fungi isolated belonged to the genera of Alternaria longipes, Curvularia spp, Mucor, phoma spp, Aspergillus niger, Aspergillus flavus and Penicillium spp. In this study majority of the fungi belonged to hyaline hyphomycetes.Conclusion: In this study conclude that the isolation of endophytic fungi from medicinal plant of terminalia chebula. To isolate the 27 endophytic fungi produce the novel bioactive compound. However Further studies are required to screen these endophytic fungi for production of novel Bioactive compounds.Keywords: Endophytic fungi, Terminalia chebula, bioactive compoundÂ

Dynamic Gaits and Control in Flexible Body Quadruped Robot

Legged robots are highly attractive for military purposes such as carrying heavy loads on uneven terrain for long durations because of the higher mobility they give on rough terrain compared to wheeled vehicles/robots. Existing state-of-the-art quadruped robots developed by Boston Dynamics such as LittleDog and BigDog do not have flexible bodies. It can be easily seen that the agility of quadruped animals such as dogs, cats, and deer etc. depend to a large extent on their ability to flex their bodies. However, simulation study on step climbing in 3D terrain quadruped robot locomotion with flexible body has not been reported in literature. This paper aims to study the effect of body flexibility on stability and energy efficiency in walking mode, trot mode and running (bounding) mode on step climbing

A review on novel COVID-19: background, etiology, pathogenesis, transmission, prevention and management

Mankind's history is watching a bizarre time battling an imperceptible adversary, the novel COVID-19 Coronavirus. At first seen in the Wuhan province of China, presently limitlessly spreading all over world. How the COVID 19 has been made on the globe become Pandemic needs no depiction. The virus has been accounted for affecting the lungs and related respiratory tracts promoting harm of the alveoli. It has been accounted that the respiratory sickness is the prevailing Clinical symptom of COVID-19. This review article discusses an easily understanding of the causes, different type of Human viruses regarded of Coronavirus, clinical diagnosis of RT-PCR, FET, Primary prevention and control of the virus. Therefore, this review article main theme is to provide more reliable and valid information to control and manage public emergency in both acute and chronic conditions of coronaviru

Gynecomastia and hypertension in a patient treated with posaconazole

Posaconazole therapy may lead to increased serum estradiol levels and development of gynecomastia. Early detection by endocrine hormone measurements may help preventing gynecomastia