Hamartoma Breast, Chondromatous Type.

This case report describes an exceedingly rare case of hamartoma of breast with predominantly chondroid stroma. A 45 year old lady presented with a mobile lump in the upper outer quadrant of left breast, clinically diagnosed as fibroadenoma. Mammography and FNAC were not done. She underwent lumpectomy and we received the specimen measuring 7x5x3cm. Cut surface of which revealed grey white nodule with glistening surface. Histopathologically we found a circumscribed lesion with predominantly mature hyaline cartilage separated by fibrocollagenous bands

Non-resonant microwave absorption studies of superconducting MgB_2

Non-resonant microwave absorption(NRMA) studies of superconducting MgB_2 at a frequency of 9.43 GHz in the field range -50 Gauss to 5000 Gauss are reported. The NRMA results indicate near absence of intergranular weak links. A linear temperature dependence of the lower critical field H_c1 is observed indicating a non s-wave superconductivity. However, the phase reversal of the NRMA signal which could suggest d-wave symmetry is also not observed.Comment: 8 pages, 2 figure

External Bias Dependent Direct To Indirect Bandgap Transition in Graphene Nanoribbon

In this work, using self-consistent tight-binding calculations, for the first time, we show that a direct to indirect bandgap transition is possible in an armchair graphene nanoribbon by the application of an external bias along the width of the ribbon, opening up the possibility of new device applications. With the help of Dirac equation, we qualitatively explain this bandgap transition using the asymmetry in the spatial distribution of the perturbation potential produced inside the nanoribbon by the external bias. This is followed by the verification of the bandgap trends with a numerical technique using Magnus expansion of matrix exponentials. Finally, we show that the carrier effective masses possess tunable sharp characters in the vicinity of the bandgap transition points.Comment: Accepted for publication in Nano Letter

Intrinsic Limits of Subthreshold Slope in Biased Bilayer Graphene Transistor

In this work, we investigate the intrinsic limits of subthreshold slope in a dual gated bilayer graphene transistor using a coupled self-consistent Poisson-bandstructure solver. We benchmark the solver by matching the bias dependent bandgap results obtained from the solver against published experimental data. We show that the intrinsic bias dependence of the electronic structure and the self-consistent electrostatics limit the subthreshold slope obtained in such a transistor well above the Boltzmann limit of 60mV/decade at room temperature, but much below the results experimentally shown till date, indicating room for technological improvement of bilayer graphene.Comment: 10 pages, 2 figure

Purification and characterization of a myotoxic phospholipase-a2 from indian cobra (Naja-Naja-Naja) venom

Purification and characterization of a myotoxic phospholipase A2 from Indian cobra (Naja naja naja) venom. Toxicon27, 861–873, 1989.—A major phospholipase A2 (NN-XIII-PLA2) which constitutes 20% of the whole Naja naja naja venom was purified to homogeneity on CM-Sephadex C-25 column chromatography. NN-XIII-PLA2 is a basic protein with a mol. wt of 11,200 by SDS-PAGE. This enzyme has low enzymatic activity but is more toxic to mice than the whole venom. The ld50 value (i.p.) of NN-XIII-PLA2 is 2.4 mg/kg body weight (whole venoms ld50 is 2.8 mg/kg body weight). It induces neurotoxic-like signs in experimental animals. It induces myotoxicity when injected i.m. into the thigh muscle of mice and edema when injected into the foot pads of mice. This enzyme has a fluorescence maxima between 310–316 nm which is typical of tyrosine residues

Učinak brzine posmika u poroznom ležaju s klizačem u obliku sekante i s ferofluidnim mazivom

We analysed a bearing with a secant shaped slider and with the stator having a porous facing backed by a solid wall, using a magnetic fluid lubricant flowing as per Jenkins model. Computed values of the bearing characteristics are displayed in tabular form. The load capacity, friction on the slider and the coefficient of friction decreased with increasing values of the slip parameter. The load capacity decreased and friction as well as the coefficient of friction increased with increasing values of the material parameter. However, the position of the centre of pressure did not significantly alter owing to the changes in slip parameter. But it slowly shifted towards the inlet when the material parameter increased.Analiziramo ležaj s klizačem u obliku sekante u kojemu je stator porozan s čvrstom podlogom, a rabi magnetsko tekuće mazivo koje teče prema Jenkinsovom modelu. Izračunate vrijednosti značajki ležaja prikazuju se u tablicama. Nosivost, trenje klizača i koeficijent trenja smanjuju se pri povećanju parametra posmicanja, a nosivost i trenje smanjuju se pri povećanju parametra materijala. Položaj središta tlaka ne mijenja se bitno zbog promjena parametra posmicanja, ali se pomalo pomiče prema ulazu pri povećanju parametra materijala

Ležaj sa stisnutim slojem ferofluida, uz anisotropnu permeabilnost, parametar klizne brzine materijala i tromost vrtnje

We present a theoretical study of the effect of anisotropic permeability and slip velocity on the action of the squeeze film formed when a secant-shaped circular upper plate with a porous facing approaches an impermeable and flat circular lower plate, considering also rotation of the plates. Expressions for the dimensionless pressure, load capacity and the response time are given by a differential equation. Computed values of dimensionless load capacity and response time are displayed in tabular form. It has been found that they decrease with increasing values of radial permeability, slip parameter and rotational inertia. However, they increase with increasing values of axial permeability and material constant of the Jenkins model. They have also been found to increase when the speed of the lower plate is higher than that of the upper plate.Opisujemo teoriju djelovanja anizotropne permeabilnosti i brzine klizanja na učinak stisnutog sloja koji nastaje kada se gornja ploča sekantnog oblika s poroznom površinom nasloni na nepropusnu i ravnu kružnu donju ploču. Bezdimenzijski tlak, nosivost i vrijeme odziva izražavamo diferencijalnom jednadžbom. Izračunate vrijednosti za nosivost i vrijeme odziva prikazujemo u tablicama. Nalazi se da one opadaju pri porastu radijalne permeabilnosti, parametra klizanja i momenta tromosti. Međutim, one se povećavaju pri porastu aksijalne permeabilnosti i konstante materijala prema Jenkinsovom modelu. Također nalazimo da rastu kada je brzina gornje veća od brzine donje ploče

Ležaj sa stisnutim slojem ferofluida, uz anisotropnu permeabilnost, parametar klizne brzine materijala i tromost vrtnje

We present a theoretical study of the effect of anisotropic permeability and slip velocity on the action of the squeeze film formed when a secant-shaped circular upper plate with a porous facing approaches an impermeable and flat circular lower plate, considering also rotation of the plates. Expressions for the dimensionless pressure, load capacity and the response time are given by a differential equation. Computed values of dimensionless load capacity and response time are displayed in tabular form. It has been found that they decrease with increasing values of radial permeability, slip parameter and rotational inertia. However, they increase with increasing values of axial permeability and material constant of the Jenkins model. They have also been found to increase when the speed of the lower plate is higher than that of the upper plate.Opisujemo teoriju djelovanja anizotropne permeabilnosti i brzine klizanja na učinak stisnutog sloja koji nastaje kada se gornja ploča sekantnog oblika s poroznom površinom nasloni na nepropusnu i ravnu kružnu donju ploču. Bezdimenzijski tlak, nosivost i vrijeme odziva izražavamo diferencijalnom jednadžbom. Izračunate vrijednosti za nosivost i vrijeme odziva prikazujemo u tablicama. Nalazi se da one opadaju pri porastu radijalne permeabilnosti, parametra klizanja i momenta tromosti. Međutim, one se povećavaju pri porastu aksijalne permeabilnosti i konstante materijala prema Jenkinsovom modelu. Također nalazimo da rastu kada je brzina gornje veća od brzine donje ploče

Učinak brzine posmika u poroznom ležaju s klizačem u obliku sekante i s ferofluidnim mazivom

We analysed a bearing with a secant shaped slider and with the stator having a porous facing backed by a solid wall, using a magnetic fluid lubricant flowing as per Jenkins model. Computed values of the bearing characteristics are displayed in tabular form. The load capacity, friction on the slider and the coefficient of friction decreased with increasing values of the slip parameter. The load capacity decreased and friction as well as the coefficient of friction increased with increasing values of the material parameter. However, the position of the centre of pressure did not significantly alter owing to the changes in slip parameter. But it slowly shifted towards the inlet when the material parameter increased.Analiziramo ležaj s klizačem u obliku sekante u kojemu je stator porozan s čvrstom podlogom, a rabi magnetsko tekuće mazivo koje teče prema Jenkinsovom modelu. Izračunate vrijednosti značajki ležaja prikazuju se u tablicama. Nosivost, trenje klizača i koeficijent trenja smanjuju se pri povećanju parametra posmicanja, a nosivost i trenje smanjuju se pri povećanju parametra materijala. Položaj središta tlaka ne mijenja se bitno zbog promjena parametra posmicanja, ali se pomalo pomiče prema ulazu pri povećanju parametra materijala

Establishing a Wireless Sensor Network to Monitor the Temperature in a two storied building

The advancement in information technology and the need for large-scale communication infrastructure has triggered the era of Wireless Sensor Networks (WSNs). Sensor network is a collection of sensor nodes connected wirelessly to one another to gather information about the surrounding environment. In this paper a WSN testbed is established using Texas instruments sensor nodes to monitor the temperature in a two storied building