Inverse solid-liquid fluidization of aerogel granules and its application in removing oil from water

Fluidization is a very well known unit operation used in the chemical industry for various purposes. Inverse solid-liquid fluidization, where the solid particles to be fluidized are less dense than the fluid, is one of the several different kinds of fluidization being studied for its potential in industrial applications. The present work focuses on finding the hydrodynamic characteristics (minimum fluidization velocity, bed expansion and pressure drop) of an inverse fluidized bed of aerogel granules and using this system to remove oil from an oil-water mixture. The solid particles employed for this study are low density (100 kg/m3) surface treated hydrophobic aerogel (Nanogel®) granules of size in the range of 0.5 to 2.3 mm. These particles are highly porous characterized by a nanosized pore structure and a very high surface area. Since their density is lower than water, they are fluidized downward in a solid-liquid inverse fluidized bed column. In this work, a constant flow of an oil-water mixture is passed through an inverse fluidized bed of aerogel granules. The oil concentration was determined by measuring the Chemical Oxygen Demand (COD) using a colorimeter. Once the aerogel granules are saturated, they were entrained from the fluidized bed, and separated from the clean stream of water with a fibrous filter

Time Stamp based Cross Layer MANET Security Protocol

Mobile Adhoc Network (MANET) is a wireless network where nodes communicate through other nodes without the aid of a base station. Security is a major challenge in MANET as the packets are prone vulnerability and eavesdropping in wireless environment. Generally MAC layer provides the security in such wireless network through encryption and authentication and the protocol is called WEP. Many authentication and encryption techniques are proposed to increase the security of the MANET. But stronger Security leads to more energy loss as mobiles have less energy and limited processing capability. In this work a Cross layer timestamp based network security technique is developed. The technique reduces the encryption packet overflow which is due to PKE or public key exchange, and derives the public key directly from the neighbor2019;s table which is transmitted using routing information exchange. The simulation is performed with omnet++ simulator. Performance results demonstrate that the energy overhead due to encryption or performance compromise are very low in the proposed system. Further as the protocol is embedded in the network layer it is easily adoptable to any existing architecture without modifying the MAC or Physical layer standard or protocol

Seq-UPS: Sequential Uncertainty-aware Pseudo-label Selection for Semi-Supervised Text Recognition

This paper looks at semi-supervised learning (SSL) for image-based text recognition. One of the most popular SSL approaches is pseudo-labeling (PL). PL approaches assign labels to unlabeled data before re-training the model with a combination of labeled and pseudo-labeled data. However, PL methods are severely degraded by noise and are prone to over-fitting to noisy labels, due to the inclusion of erroneous high confidence pseudo-labels generated from poorly calibrated models, thus, rendering threshold-based selection ineffective. Moreover, the combinatorial complexity of the hypothesis space and the error accumulation due to multiple incorrect autoregressive steps posit pseudo-labeling challenging for sequence models. To this end, we propose a pseudo-label generation and an uncertainty-based data selection framework for semi-supervised text recognition. We first use Beam-Search inference to yield highly probable hypotheses to assign pseudo-labels to the unlabelled examples. Then we adopt an ensemble of models, sampled by applying dropout, to obtain a robust estimate of the uncertainty associated with the prediction, considering both the character-level and word-level predictive distribution to select good quality pseudo-labels. Extensive experiments on several benchmark handwriting and scene-text datasets show that our method outperforms the baseline approaches and the previous state-of-the-art semi-supervised text-recognition methods.Comment: Accepted at WACV 202

Can perineal tear be predicted by severity of striae gravidarum score?

Background: The objective of this study was to wether perineal tear predicted by scoring of severity of striae gravidarum. The objective of this study was to predict perineal tear by simple non-invasive method and help to prevent maternal morbidity.Methods: Three hundred ninety four patients delivered normally were included in this study. Striae gravidarum score was assessed using the Atwal numerical scoring system. The association was examined between striae and perineal tear as the outcome measure, defined by tears or laceration, and the total striae scores (TSS) was obtained.Results: In present study population mean age was 25.16 years ranging from 16-40 , mean gravidity was 2.16 ranging from 1 -8 ,average baby birth weight was 2.713 kg ranging from  1.62-4.58 The only predictors of perineal tears that were found to be statistically significant in our study were severity of striae gravidarum and episiotomy given or not. In patients with moderate to severe striae there was tear in 90 patients as compared to 29 patients with no or mild striae. 224 patients belonging to no or mild striae group delivered without any perineal tear whereas 51 patients in moderate to severe striae group delivered without tear. Out of these 51 patients 5 were given episiotomy. 2 patients who were given episiotomy had perineal tear as compared to 117 patients who were not given episiotomy. This shows that patients who had an episiotomy were less likely to have perineal tear in most cases.Conclusions: This study demonstrates a significant relation between severity of striae gravidarum and perineal tear. The findings suggest that striae gravidarum assessment may be used in the clinical setting even by paramedical staff as a simple and noninvasive tool to better define women at risk for perineal tear

Production of bio-gas (In urban areas using different types of wastes)

The focus of the research paper is to investigate the importance of biogas as an alternative energy sources in urban area. Urban waste, including wastewater treatment plants, food waste from households and businesses, yard clippings, human wastes, vegetable market wastes, and non-recyclable paper, will create biogas under the right conditions. Food waste from grocery stores, restaurants, cafeterias and homes contains energy and valuable nutrients. These wastes of specific area should collect in single tank and use them in bio-gas production

Patterns of injuries in homicidal cases

Death, an inevitable part of life, prompts an exploration into the manner and method by which it occurs. This study aims to analyze the patterns of injuries in homicidal cases brought for postmortem examination. In 2019, a total of 28,918 murder cases were registered in India, showing a slight decrease of 0.3% in comparison to 2018 (29,017 cases). The study aims to understand the different injury patterns in homicide. At the Department of Forensic Medicine, Gandhi Medical College, Bhopal, India, a total of 62 males and 12 females, along with one unknown gender person, where submitted to postmortem examination. The majority of cases belonged to urban, with leading causes of death being shock and hemorrhage followed by craniocerebral damage. This study concludes that sharp edges and deep cuts were the primary injury patterns in homicide cases. Morte, uma inevitável parte da vida, incita uma exploração a respeito da maneira e do método de sua ocorrência. Este estudo tem por objetivo analisar os padrões de lesões em casos de homicídios verificados em exames post-mortem. Em 2019, registrou-se um total de 28.918 casos de assassinato na India, mostrando um leve decréscimo de 0,3% em comparação com 2018 (29.017 casos). Este estudo objetiva entender os diferentes padrões de lesão em homicídios. No Departamento de Medicina Forense da Gandhi Medical College, em Bhopal, India, um total de 62 homens, 12 mulheres e uma pessoa de gênero não identificado, foram submetidas à análise post mortem. A maioria dos casos pertencia a áreas urbanas, com principal causa de morte sendo choque e hemorragia seguida de dano crânio cerebral. Este estudo conclui que arestas afiadas e cortes profundos foram os principais padrões de lesões em casos de homicídio.