To mesh or not to mesh: flexible wireless indoor communication among mobile robots in industrial environments

Mobile robots such as automated guided vehicles become increasingly important in industry as they can greatly increase efficiency. For their operation such robots must rely on wireless communication, typically realized by connecting them to an existing enterprise network. In this paper we motivate that such an approach is not always economically viable or might result in performance issues. Therefore we propose a flexible and configurable mixed architecture that leverages on mesh capabilities whenever appropriate. Through experiments on a wireless testbed for a variety of scenarios, we analyse the impact of roaming, mobility and traffic separation and demonstrate the potential of our approach

Copper

Copper is an essential element found in the blood and other tissues of Crustacea. It forms a part of cuproprotein required for oxygen transport and electron transport systems. It also forms as prosthetic group in many enzymes such as phenol oxidase and acts as activator for enzymes such as malate dehydrogenase. It is toxic in free state (Holden, 1970) and dialysable copper is absent in the blood of crustaceans (Arumugam & Ravindranath, 1980). The copper exists in blood both in the cuprous and cupric state and is linked with protein through sulphydryl groups (Klotz & Klotz, 1955). Several methods are in vogue for determination of copper. Some of them are suitable for vertebrate tissue where it is 100 times lower than the crustacean blood or other tissues. Here the suitability and consistency of 3 spectrophotometry methods were analysed for determination of crustacean blood or other tissue copper concentration

Semi-dwarf narrow rolled leaf mutant in rice: Photosynthetic efficiency and physiological response to gibberellic acid (GA3)

Leaf is the major component for fixation of carbondioxide to produce more photoassimilates and maintains source sink relationship in plants. The present investigation was carried out to study the photosynthetic efficiency and physiological response of GA3 of semi-dwraf narrow rolled leaf mutant. Semi-dwarf narrow rolled leaf mutant exhibited reduced plant height, reduced leaf width, reduced panicle length and number of grains per panicle when compared to wild type. Photosynthetic efficiency study revealed that the mutant showed higher photosynthetic efficiency than wild type. Complementation test with GA3 clearly revealed that this mutant is sensitive to GA3 and revert to normal plant height. Scanning Electron Microscope study revealed that mutant had exhibited minimum number of inter-veins between veins, minimum distance between midrib and has slightly larger cell size. Hence, this loss of function mutant is very useful to map the regions associated with panicle length, number of grains per panicle and other traits related to enhancement of yield. The result provides an important clue for further understanding the mechanism of rice leaf development and plant architecture

In vitro callus induction in rice (Oryza sativa L.)

In vitro callus induction from embryos of matured seeds of four rice varieties viz.,ASD 16, ADT 43, Basmati 370, Pusa Basmati and Pokkali were studied. Observations oncallus induction were carried out on six different callus induction medium having differentconcentration of 2,4-D viz., 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 mg/l. The callus induction frequencyvaried from 58.33 % to 96.67 %. This study will be useful for selecting suitable callusinduction medium for callus induction

On k-Equivalence Domination in Graphs

Let G = (V,E) be a graph. A subset S of V is called an equivalence set if every component of the induced subgraph (S) is complete. If further at least one component of (V − S) is not complete, then S is called a Smarandachely equivalence set

Z Source Inverter Topologies-A Survey

Need for alternative energy sources to satisfy the rising demand in energy consumption elicited the research in the area of power converters/inverters. An increasing interest of using Z source inverter/converter in power generation involving renewable energy sources like wind and solar energy for both off grid and grid tied schemes were originated from 2003. This paper surveys the literature of Z source inverters/converter topologies that were developed over the years

Hydrostatic pressure effect on Tc of new BiS2 based Bi4O4S3 and NdO0.5F0.5BiS2 layered superconductors

We investigate the external hydrostatic pressure effect on the superconducting transition temperature (Tc) of new layered superconductors Bi4O4S3 and NdO0.5F0.5BiS2. Though the Tc is found to have moderate decrease from 4.8 K to 4.3 K (dTconset/dP = -0.28 K/GPa) for Bi4O4S3 superconductor, the same increases from 4.6 K to 5 K (dTconset/dP = 0.44 K/GPa) upto 1.31 GPa followed by a sudden decrease from 5 K to 4.7 K upto 1.75 GPa for NdO0.5F0.5BiS2 superconductor. The variation of Tc in these systems may be correlated to increase or decrease of the charge carriers in the density of states under externally applied pressure.Comment: 3 pages text +Fig

A note on the foetus of the hump-back dolphin from Tuticorin coast, Gulf of Mannar

On 16-2-'94 a female Hump - back dolphin Sousachinensis (Osbeck)measuring 2.235 mm and weighing 80 kg was accidently caughtin drift gillnet off Tuticorin. When the dolphin was cut openeda foetus measuring 250 mm was obteilned from i

Nuclear reaction studies of unstable nuclei using relativistic mean field formalisms in conjunction with Glauber model

We study nuclear reaction cross-sections for stable and unstable projectiles and targets within Glauber model, using densities obtained from various relativistic mean field formalisms. The calculated cross-sections are compared with the experimental data in some specific cases. We also evaluate the differential scattering cross-sections at several incident energies, and observe that the results found from various densities are similar at smaller scattering angles, whereas a systematic deviation is noticed at large angles. In general, these results agree fairly well with the experimental data.Comment: 9 pages, 7 figures, submitted to PR

Occurrence of Sun fishes along Tuticorin Coast

During the year 2005, four numbers of Mola mola were encountered along the Tuticorin Coast in Gulf of Mannar, of which three numbers landed at Thiruvaikulam, a fishing hamlet 15 kms north of Tuticorin, and one specimen landed at Kayalpatnam, another fishing village 40 km south of Tuticorin