The effect of steady aerodynamic loading on the flutter stability of turbomachinery blading

An aeroelastic analysis is presented which accounts for the effect of steady aerodynamic loading on the aeroelastic stability of a cascade of compressor blades. The aeroelastic model is a two degree of freedom model having bending and torsional displacements. A linearized unsteady potential flow theory is used to determine the unsteady aerodynamic response coefficients for the aeroelastic analysis. The steady aerodynamic loading was caused by the addition of airfoil thickness and camber and steady flow incidence. The importance of steady loading on the airfoil unsteady pressure distribution is demonstrated. Additionally, the effect of steady loading on the tuned flutter behavior and flutter boundaries indicates that neglecting either airfoil thickness, camber or incidence could result in nonconservative estimates of flutter behavior

Generation of monodisperse droplets by spontaneous condensation of flow in nozzles

Submicron size monodisperse particles are of interest in many industrial and scientific applications. These include the manufacture of ceramic parts using fine ceramic particles, the production of thin films by deposition of ionized clusters, monodisperse seed particles for laser anemometry, and the study of size dependence of cluster chemical and physical properties. An inexpensive and relatively easy way to generate such particles is by utilizing the phenomenon of spontaneous condensation. The phenomenon occurs when the vapor or a mixture of a vapor and a noncondensing gas is expanded at a high expansion rate. The saturation line is crossed with the supercooled vapor behaving like a gas, until all of a sudden at the so called Wilson point, condensation occurs, resulting in a large number of relatively monodisperse droplets. The droplet size is a function of the expansion rate, inlet conditions, mass fraction of vapor, gas properties, etc. Spontaneous condensation of steam and water vapor and air mixture in a one dimensional nozzle was modeled and the resulting equations solved numerically. The droplet size distribution at the exit of various one dimensional nozzles and the flow characteristics such as pressure ratio, mean droplet radius, vapor and droplet temperatures, nucleation flux, supercooling, wetness, etc., along the axial distance were obtained. The numerical results compared very well with the available experimental data. The effect of inlet conditions, nozzle expansion rates, and vapor mass fractions on droplet mean radius, droplet size distribution, and pressure ratio were examined

Texas Forestry Paper No. 5

Experimental planting of eucalyptus in the rio grand valley, texashttps://scholarworks.sfasu.edu/texas_forestry_papers/1006/thumbnail.jp

Resolving Multi-path Interference in Time-of-Flight Imaging via Modulation Frequency Diversity and Sparse Regularization

Time-of-flight (ToF) cameras calculate depth maps by reconstructing phase shifts of amplitude-modulated signals. For broad illumination or transparent objects, reflections from multiple scene points can illuminate a given pixel, giving rise to an erroneous depth map. We report here a sparsity regularized solution that separates K-interfering components using multiple modulation frequency measurements. The method maps ToF imaging to the general framework of spectral estimation theory and has applications in improving depth profiles and exploiting multiple scattering.Comment: 11 Pages, 4 figures, appeared with minor changes in Optics Letter

Comparison of the bidirectional reflectance distribution function of various surfaces

Described is the development and use of a system to measure the Bidirectional Reflectance Distribution Function (BRDF) of various surfaces. The BRDF measurements are used in the analysis and design of optical measurement systems, such as laser anemometers. An argon ion laser (514 nm) is the light source. Preliminary results are presented for eight samples: two glossy black paints, two flat black paints, black glass, sand blasted aluminum, unworked aluminum, and a white paint. A BaSO4 white reflectance standard was used as the reference sample throughout the tests. The reflectance characteristics of these surfaces are compared

Clinical study on feto-maternal outcome in teenage pregnancy in a tertiary care institute

Background: Pregnancies that occur below the age of 20 years are called teenage pregnancies. Teenage pregnancy is a common public health problem worldwide which is detrimental to the health of both the mother and the new-born. This study aims to evaluate the obstetric and perinatal outcomes of teenage pregnancy in the Indian rural and semi urban population. Methods: A retrospective observational study was undertaken in the department of obstetrics and gynecology, Mysore Medical College and Research Institute, Mysore, for a period of one year from August 2021 to September 2022. All the teenage mothers during the study period were included in the study. Data was analysed included various maternal parameters, fetal parameters, and the outcome of pregnancy. Results: Study showed the incidence of teenage pregnancy is 12.6%. About 88.3% were primgravida, 74% were booked cases. 51.6% of the teenage mothers had varying grades of anaemia, 29.09% of teenage mothers had spectra of hypertensive disorders if pregnancy, 27.92% had PROM. Caesarean section rates were 25%, Fetal distress being the most common indication in 47.3% followed by fail induction in 29.8%. Preterm delivery rates were as high as 13.6%. Postpartum complications included postpartum hemorrhage in 2.5%, puerperal pyexia in 1.9%, postpartum eclampsia in 1.38%. Respiratory distress was seen in 17.6% neonates, prematurity in 15.49%, IUGR in 13.6%, 2.99% were stillborn send 3.36% succumbed due to pre-maturity, respiratory distress, and sepsis. Conclusions: From the present study we infer that the prevalence of teenage pregnancy is still high in rural and semi urban population and they suffered from a significant number of complications in pregnancy including anemia pre-eclampsia and preterm labour, neonatal respiratory distress and early onset sepsis. To surmount these problems a multidisciplinary team involving health and social workers, obstetrician and gynaecologist are required to improve adolescent reproductive health.

Simplified Identification of mRNA or DNA in Whole Cells

A recently invented method of detecting a selected messenger ribonucleic acid (mRNA) or deoxyribonucleic acid (DNA) sequence offers two important advantages over prior such methods: it is simpler and can be implemented by means of compact equipment. The simplification and miniaturization achieved by this invention are such that this method is suitable for use outside laboratories, in field settings in which space and power supplies may be limited. The present method is based partly on hybridization of nucleic acid, which is a powerful technique for detection of specific complementary nucleic acid sequences and is increasingly being used for detection of changes in gene expression in microarrays containing thousands of gene probes