Search

Quaternary superionic conducting AgIAg2O(MoO3 + As2O5) glasses with different dopant salt (AgI) contents were prepared by fast quenching of the melt into liquid nitrogen, and characterized by X-ray diffraction. Electrical conductivity studies on pressed pellets are reported. At room temperature (303 K), the highest conductivity, σ = 1.65 × 10 −2 S cm −1 was obtained for the glass with 60 mol.% of AgI. The Ag+ ion concentration and the packing density for glasses were calculated. The conductivity variation with dopant salt is discussed based on the diffusion path model.

In this paper, we have developed a probabilistic approach using PLSA for the discovery and analysis of contextual keyword relevance based on the distribution of keywords across a training text corpus. We have shown experimentally, the flexibility of this approach in classifying keywords into different domains based on their context. We have developed a prototype system that allows us to project keyword queries on the loaded PLSA model and returns keywords that are closely correlated. The keyword query is vectorized using the PLSA model in the reduce aspect space and correlation is derived by calculating a dot product. We also discuss the parameters that control PLSA performance including a) number of aspects, b) number of EM iterations c) weighting functions on TDM (pre-weighting). We have estimated the quality through computation of precision-recall scores. We have presented our experiments on PLSA application towards document classification.

Experiments were conducted to investigate the effect of impeller geometry and tongue shape on the flow field of cross flow fans. Three impellers (I, II, III) having same outer diameter, but different radius ratio and blade angles were employed for the investigation. Each impeller was tested with two tongue shapes. Flow survey was carried out for each impeller and tongue shape at two flow coefficients, and for each flow coefficient at different circumferential positions. The flow is two-dimensional along the blade span except near the shrouds. The total pressure developed by the impellers in each case is found to be maximum at a circumferential position of around 270�. The total and static pressures at the inlet of impellers are more or less same regardless of impeller and tongue geometry, but they vary considerably at exit of the impellers. Impeller III with tongue T2 develops higher total pressure and efficiency where as impeller II with tongue T2 develops minimum total pressure. Higher diffusion and smaller vortex size are the reasons for better performance of impeller III with tongue T2.

In order to find out the most suitable ratio of sorghum (Sorghum bicolor) straw: concentrate for optimum growth, production and carcass characteristics in Nellore ram lambs, a study was carried out by feeding sorghum straw based complete rations at the ratio of 70:30 (CR-I), 60:40 (CR-II), 50:50 (CR-III) and 40:60 (CR-IV) for 180d. The ADG was significantly (P 0.05) among the four groups; however, significant (P

In this paper, the study of the steady two-dimensional flow of an incompressible viscous fluid with heat and mass transfer and MHD heat generation past a moving vertical plate with suction in the presence of viscous dissipation and chemical reaction is investigated. Using similarity variables, the governing partial differential equations are transformed into non-linear ordinary differential equations. These equations are then solved numerically using fourth order Runge-Kutta method with shooting technique. The flow variables are presented graphically. The graphs showed that velocity rises for increasing Grashof number, mass Grashof numer, suction, heat generation and Eckert number while reducing with increasing magnetic parameter, Schmidt number, and chemical reaction parameter and Prandtl number. Comparisons with previously published work are performed and are found to be in an excellent agreement.

Bare and carbon coated LiMnPO 4 nanorods were synthesized by modified polyol and resin coating processes to enhance their conductivity as well as their electrochemical properties. X-ray diffraction, Fourier transform infrared, scanning electron microscope, and transmission electron microscope results confirmed crystalline phase, structure, and uniform coating of carbon over LiMnP0 4 nanorods, respectively. Raman spectra of carbon coated LiMnPO 4 nanorods showed two bands (D and G bands) due to the presence of carbon, which was not observed in the bare LiMnPO 4 nanorods. Conductivity and mobility results showed more than 2 orders of magnitude enhancement of electronic conductivity in the carbon coated LiMnP0 4 nanorods compared to the bare one and it is attributed to the presence of carbon over LiMnP0 4 nanorods. CR2032-type lithium ion coin cells were fabricated using bare and carbon coated LiMnP0 4 nanorods and characterized by measuring charge―discharge cycles between 2.9 and 4.5 V at room temperature. Both cells exhibit high capacity and good cyclability. The improved capacity was attributed to a one dimensional electron transport pathway in LiMnP0 4 nanorods. Further improvement in the capacity, up to 120 mAh/g at C (25%), was also achieved in the carbon coated LiMnP0 4 nanorods synthesized using modified polyol and resin coating processes.

NiAl2O4/SiO2 and Co2+-doped NiAl2O4/SiO2 nanocomposite materials of compositions 5% NiO – 6% Al2O3– 89% SiO2 and 0.2% CoO – 4.8% NiO – 6% Al2O3– 89% SiO2, respectively, were prepared by a sol–gel process. NiAl2O4 and cobalt-doped NiAl2O4 nanocrystals were grown in a SiO2 amorphous matrix at around 1073 K by heating the dried gels from 333 to 1173 K at the rate of 1 K/min. The formations of NiAl2O4 and cobalt-doped NiAl2O4 nanocrystals in SiO2 amorphous matrix were confirmed through X-ray powder diffraction, Fourier transform infrared spectroscopy, differential scanning calorimeter, transmission electron microscopy (TEM), and optical absorption spectroscopy techniques. The TEM images revealed the uniform distribution of NiAl2O4 and cobalt-doped NiAl2O4 nanocrystals in the amorphous SiO2 matrix and the size was found to be ∼5–8 nm.

Mutagenic studies have been made after single and combined treatments of gamma rays, ethylmethane sulphonate (EMS) and hydroxylamine (HA) in Catharanthus roseus of pink flowered form (PFF). The present observations in meiotic system disclosed various types of chromosomal alterations such as different association of chromosomes at diakinesis, unequal disjunction at anaphase I, unoriented chromosomes at metaphase I and II, fragments, bridges with or without laggards, and micronuclei at telophase II. Besides, tetrad abnormalities like monads, dyads, triads and polyads were observed. Similar types of meiotic anomalies were also recorded in mutants like sterile (in which flower modified into vegetative structures), variegated, non-branching and dissected flower. The abnormal phenotype of the above mutants may be attributed to chromosomal alterations. The combination treatments proved to be much effective than individual treatments.

The problem of bending of a circular block with concentric hole into ellipsoidal shell is considered, and the earlier results have been obtained as particular cases.

The problems of bending of aelotropic incompressible composite circular blocks into elliposidal shell have been studied following the method of Seth, et al. and a particular case has been obtained.