Software Reliability Growth Model Based on Linear Failure Rate Distribution

A Non Homogenous Poisson Process (NHPP) with its mean value function generated by the cumulative distribution function of linear failure rate distribution is considered. It is modeled to assess the failure phenomenon of a developed software. When the failure data is in the form of number of failures in a given interval of time the model parameters are estimated by moment type estimation method and the performance of the model using three data sets is discussed in comparison with similar other models

Electro-Discharge Machining of Aluminum Alloy with Nickel Powder-Mixed Dielectric

Powder-mixed dielectric fluid is one of the innovations of electrode-discharge machining (EDM) which seeks to improve the process outputs by addition of Nickel powders to the dielectric during machining. In the present study, the influence of Nickel powder in kerosene dielectric fluid on EDM process outputs was investigated.  Experiments were conducted with the outputs as material removal rate (MRR) and surface roughness(Ra). During the EDM, the discharge current was varied between 3 and 15 A, while powder concentration ranges between 2 and 10 g/l.  Results indicate that the highest MRR of  39.888 mm3 /min was obtained with Nickel powder concentration of 6 g/l at the current of  9A, where as the lowest SR of  3.397 μm was obtained with Nickel concentration of 3 g/l at the current of 3A

Diffusion of a chemically reactive species of a power-law fluid past a stretching surface

A numerical solution for the steady magnetohydrodynamic (MHD) non-Newtonian power-law fluid flow over a continuously moving surface with species concentration and chemical reaction has been obtained. The viscous flow is driven solely by the linearly stretching sheet, and the reactive species emitted from this sheet undergoes an isothermal and homogeneous one-stage reaction as it diffuses into the surrounding fluid. Using a similarity transformation, the governing non-linear partial differential equations are transformed into coupled nonlinear ordinary differential equations. The governing equations of the mathematical model show that the flow and mass transfer characteristics depend on six parameters, namely, the power-law index, the magnetic parameter, the local Grashof number with respect to species diffusion, the modified Schmidt number, the reaction rate parameter, and the wall concentration parameter. Numerical solutions for these coupled equations are obtained by the KellerBox method, and the solutions obtained are presented through graphs and tables. The numerical results obtained reveal that the magnetic field significantly increases the magnitude of the skin friction, but slightly reduces the mass transfer rate. However, the surface mass transfer strongly depends on the modified Schmidt number and the reaction rate parameter; it increases with increasing values of these parameters. The results obtained reveal many interesting behaviors that warrant further study of the equations related to non-Newtonian fluid phenomena, especially shear-thinning phenomena. Shear thinning reduces the wall shear stress. © 2011 Elsevier Ltd. All rights reserved

Washing studies with a limestone sample for reduction of insolubles: a case study

The paper deals with the washing studies conducted with a limestone sample received from Rourkela Steel Plant with a view to reduce the insolubles. The sample analysed 14.88% insolubles and it was required to reduce the same to below 12% level. As the sample contained some amount of clay both in the fines and coating the lumps, it was decided to conduct washing after crushing the sample to the desired size. Bench scale washing studies indicated that, bulk of the clayey matter could be removed. As the insolubles content of the coarser lumps was quite low, pilot plant scale washing studies were conducted both with -50 mm and -25 mm material separately. Results indicated that in both the cases, the insolubles could be reduced to below 12% level with a marginal loss of CaO values

IMPROVED CORROSION RESISTANCE OF FRICTION STIR ZONE OF RARE EARTH MAGNESIUM ALLOY AE42

Corrosion studies on friction stir welded AE42 magnesium alloy were carried out in 0.1 M ammonium carbonate solution. For better understanding, comparative analysis of corrosion rates was carried out before and after welding. Friction stir weld zone was more corrosion resistant than the parent metal under similar experimental conditions. Grain size was refined at weld zone. Second phase intermetallic particles were refined into tiny pieces of 1-2 micron size and evenly distributed throughout the matrix. Local electrochemical imbalance was eliminated due to the grain refinement and elimination of continuous grain boundary. These phenomena improved the corrosion resistance of weld zone. Scanning electron microscopic images confirmed mild and uniform corrosion of weld zone and rigorous inhomogeneous corrosion of parent metal

Identification and classification of detoxification enzymes from Culex quinquefasciatus (Diptera: Culicidae)

Molecular characterization of the insecticide resistance has become a hot research topic ever since the first disease transmitting arthropod (Anopheles gambiae) genome sequence has unveiled in 2002. A recent publication of the Culex quinquefasciatus genome sequence has opened up new opportunities for molecular and comparative genomic analysis of multiple mosquito genomes to characterize the insecticide resistance. Here, we utilized a whole genome sequence of Cx. quinquefasciatus to identify putatively active members of the detoxification supergene families, namely cytochrome P450s (P450s), glutathione-S-transferases (GSTs), and choline/carboxylesterases (CCEs). The Culex genome analysis revealed 166 P450s, 40 GSTs, and 62 CCEs. Further, the comparative genomic analysis shows that these numbers are considerably higher than the other dipteran mosquitoes. These observed speciesspecific expansions of the detoxification super gene family members endorse the popular understanding of the involvement of these gene families in protecting the organism against multitudinous classes of toxic substances during its complex (aquatic and terrestrial) life cycle. Thus, the generated data set may provide an initial point to start with to characterize the insecticide resistance at a molecular level which could then lead the development of an easy to use molecular marker to monitor the incipient insecticide resistance in field environs

A Multi-layer Routing Protocol for Mobility Management in Wireless Mesh Networks

AbstractIn the recent trends, Wireless Mesh networks are proven to be one of the emerging fields in the wireless networks. WMNs comprises of Gateways (GWs), Mesh Clients (MCs) and Mesh Routers (MRs). However, it is challenging job to provide seamless connectivity when MC moves around the network. The recent advances in the field of wireless technology created a chance to overwhelmed the disadvantages of wired and wireless networks. The mobility management in the WMNs motivated the researchers to concentrate. In this paper, we are proposing a model called as multi-layer routing protocol for WMNs. This protocol works with the data link layer and network layer for data frame transmission. The proposed algorithm is implemented with intra domain for experimental evaluation. The experimental results show the effectiveness of the routing protocol

ENHANCING SLICE AWARENESS OF 5G RADIO ACCESS NETWORK USING SELF-ORGANIZING NETWORK

Techniques are described herein for enhancing the slice awareness of a Radio Access Network (RAN) using a Self-Organizing Network (SON). This may solve the problem of slice allocation to a gNodeB (gNB), monitor the slice resources of the gNB and the handover of devices which are registered to a slice, and reduce handover time. In addition, the SON may push slicing policies for the gNB such as hardware based slicing, scheduler based slicing, geography based slicing, etc