A New AR Interaction Paradigm for Collaborative TeleAssistance system: The P.O.A

International audienceIn this paper, we propose a prototype of a collaborative teleassistance system for mechanical repairs based on Augmented Reality (AR). This technology is generally used to implement specific assistance applications for users, which consist of providing all the information, known as augmentations, required to perform a task. For teletransmission applications, operators are equipped with a wearable computer and a technical support expert can accurately visualize what the operator sees thanks to the teletransmission of the corresponding video stream. Within the framework of remote communication, our aim is to foster collaboration, especially informal collaboration, between the operator and the expert in order to make teleassistance easier and more efficient. To do this we rely on classical repair technologies and on collaborative systems to introduce a new human-machine interaction: the Picking Outlining Adding interaction (POA interaction). With this new interaction paradigm, technical information is provided by directly Picking, Outlining and Adding information to an item in an operator's video stream

The association of self-esteem, depression and body satisfaction with obesity among Turkish adolescents

<p>Abstract</p> <p>Background</p> <p>The purpose of this study was to determine the prevalence of overweight and obesity and to examine the effects of actual weight status, perceived weight status and body satisfaction on self-esteem and depression in a high school population in Turkey.</p> <p>Methods</p> <p>A cross-sectional survey of 2101 tenth-grade Turkish adolescents aged 15–18 was conducted. Body mass index (BMI) was calculated using weight and height measures. The overweight and obesity were based on the age- and gender-spesific BMI cut-off points of the International Obesity Task Force values. Self-esteem was measured using the Rosenberg Self-Esteem Scale, and depression was measured using Children's Depression Inventory. Logistic regression analysis was used to examine relationships among the variables.</p> <p>Results</p> <p>Based on BMI cut-off points, 9.0% of the students were overweight and 1.1% were obese. Logistic regression analysis indicated that (1) being male and being from a higher socio-economical level were important in the prediction of overweight based on BMI; (2) being female and being from a higher socio-economical level were important in the prediction of perceived overweight; (3) being female was important in the prediction of body dissatisfaction; (4) body dissatisfaction was related to low self-esteem and depression, perceived overweight was related only to low self-esteem but actual overweight was not related to low self-esteem and depression in adolescents.</p> <p>Conclusion</p> <p>The results of this study suggest that school-based adolescents in urban Turkey have a lower risk of overweight and obesity than adolescents in developed countries. The findings of this study suggest that psychological well-being of adolescents is more related to body satisfaction than actual and perceived weight status is.</p

Effects of iron concentrations, filter hydraulic loading rates, and porosities on iron removal by rapid sand filtration

Oxidation of iron particles occurring as a result of oxidation of ferrous iron Fe(II) result in undesirable effects in water quality. These iron particles can be removed from water through physical treatment processes of filtration, adsorption, and membrane systems. Iron removal with a rapid sand filtration method was investigated. Effects of iron concentrations, filter hydraulic loading rates, and porosities were studied for the effluent iron concentration, turbidity, and head loss parameters. Plexiglas filter column system with an inner diameter of 30 mm and an equivalent diameter of silica sand with 0.59 mm was used. Four iron concentrations and four hydraulic loading rates were applied. Effects of filter hydraulic loading rates depend on the influent iron concentrations. Low iron concentrations could be removed by rapid sand filtration without high head loss occurrences. Moreover, effluent iron concentrations obtained for this situation were found to be lower than 0.2 mg/L, which is the legislative limit of Turkish Drinking Water Regulation (TDWR). Filter operation time increased with increasing the porosity. Filter operation time was about 2.4 times higher at the porosity of 0.40 than that at the porosity value of 0.36. Low effluent iron concentrations were obtained at the porosity value of 0.36. © Mary Ann Liebert, Inc. 2008

Removal of trihalomethanes from drinking water by nanofiltration membranes.

Chlorine reacts with the natural organic matter (NOM) in waters and forms disinfection by-products (DBP). Major of these by-products are trihalomethanes (THM) and haloacetic acids (HAA). They have been known to cause cancer and other toxic effects to human beings. This study determined the removal efficiencies of THM by nanofiltration (NF) techniques with NF200 and DS5 membrane. The rejection of this chlorination by-products was studied at various feed concentration by changing transmembrane pressure. Experimental results indicated that in general increasing operating pressure produces a higher flux but does not have a significant effect on THM rejection. On the other hand, increasing the feed concentration produces a little change in the overall flux and rejection capacity. NF200 membrane removed more THM than DS5 membrane. The higher removal efficiency of dibromochloromethane (DBCM) was attributed to brominating characteristics (higher molecular weight (MW) and molecular size). As a consequence, the results of this study suggest that the NF membrane process is one of the best available technologies for removing THM compounds

Removal of trihalomethanes from drinking water by nanofiltration membranes

Chlorine reacts with the natural organic matter (NOM) in waters and forms disinfection by-products (DBP). Major of these by-products are trihalomethanes (THM) and haloacetic acids (HAA). They have been known to cause cancer and other toxic effects to human beings. This study determined the removal efficiencies of THM by nanofiltration (NF) techniques with NF200 and DS5 membrane. The rejection of this chlorination by-products was studied at various feed concentration by changing transmembrane pressure. Experimental results indicated that in general increasing operating pressure produces a higher flux but does not have a significant effect on THM rejection. On the other hand, increasing the feed concentration produces a little change in the overall flux and rejection capacity. NF200 membrane removed more THM than DS5 membrane. The higher removal efficiency of dibromochloromethane (DBCM) was attributed to brominating characteristics (higher molecular weight (MW) and molecular size). As a consequence, the results of this study suggest that the NF membrane process is one of the best available technologies for removing THM compounds. © 2007 Elsevier B.V. All rights reserved

Natural organic matter removal and fouling in a low pressure hybrid membrane systems.

The objective of this study was to investigate powdered activated carbon (PAC) contribution to natural organic matter (NOM) removal by a submerged MF and UF hybrid systems. It was found that filtration of surface waters by a bare MF and UF membranes removed negligible TOC; by contrast, significant amounts of TOC were removed when daily added PAC particles were predeposited on the membrane surfaces. These results support the assumption that the membranes surface properties and PAC layer structure might have considerably influential factor on NOM removal. Moreover, it was concluded that the dominant removal mechanism of hybrid membrane system is adsorption of NOM within PAC layer rather than size exclusion of NOM by both of membrane pores. Transmembrane pressure (TMP) increases with PAC membrane systems support the view that PAC adsorption pretreatment will not prevent the development of membrane pressure; on the contrary, PAC particles themselves caused membrane fouling by blocking the entrance of pores of MF and UF membranes. Although all three source waters have similar HPI content, it appears that the PAC interaction with the entrance of membrane pores was responsible for offsetting the NOM fractional effects on membrane fouling for these source waters

Herpes encephalitis in children - MRI assessment

The magnetic resonance imaging (MRI) findings in 14 patients with biopsy or polymerase chain reaction proven herpes simplex encephalitis were retrospectively reviewed to evaluate the diagnostic value of MRI in the early diagnosis of herpes simplex encephalitis in children. In addition to the early findings, follow-up MRI scans were obtained in four patients, Typical limbic system involvement was seen in 78 percent of the cases. Contrast-enhanced MRI was found to be superior to routine MRI sequences and computerized tomography (CT) in the early detection of inflammation. Follow-up MR images in four patients demonstrated the volume loss and late petechial hemorrhage in the involved regions. Magnetic resonance imaging is the method of choice in the diagnosis and follow-up of herpes simplex encephalitis

Magnetic resonance imaging in the evaluation of eyes treated with silicone oil

BACKGROUND AND OBJECTIVE: To evaluate the sensitivity of magnetic resonance imaging (MRI) in detecting retinal detachment (RD) in eyes filled with silicone oil, and to determine the MRI characteristics of silicone oil in vivo

from drinking water

Arsenic occurs naturally in the ground and surface water and is not desired in the drinking water due to carcinogenic effect on human body. The common types of arsenic are arsenate (As V) and arsenite (As III). Although arsenate removal has been achieved by membranes, adsorption, ion exchange and coagulation, arsenite removal is difficult to decrease the concentration up to the standard level (below to 10 mu g/L). In this study, nanofiltration (NF) and adsorption techniques have been compared to remove arsenite from drinking water. In nanofiltration study, different NF membranes and arsenite feed concentrations have been Studied. Feed water was prepared synthetically and laboratory scale cross-flow mode filtration apparatus with a flat-sheet membrane cell was used for NF experiments. In the adsorption experiments with granular iron hydroxide (GIH), all studies were performed in the free water flow and at the normal pH of tap water. It was concluded that arsenite concentration was lowered to below 1.0 mu g/L with adsorption. These results showed that GIH adsorption can be used to remove arsenite concentration of 0.1 and 0.5 g/L from water supplies

Comparison of nanofiltration and adsorption techniques to remove arsenic from drinking water

Arsenic occurs naturally in the ground and surface water and is not desired in the drinking water due to carcinogenic effect on human body. The common types of arsenic are arsenate (As V) and arsenite (As III). Although arsenate removal has been achieved by membranes, adsorption, ion exchange and coagulation, arsenite removal is diffi cult to decrease the concentration up to the standard level (below to 10 µg/L). In this study, nanofi ltration (NF) and adsorption techniques have been compared to remove arsenite from drinking water. In nanofi ltration study, different NF membranes and arsenite feed concentrations have been studied. Feed water was prepared synthetically and laboratory scale cross-fl ow mode fi ltration apparatus with a fl at-sheet membrane cell was used for NF experiments. In the adsorption experiments with granular iron hydroxide (GIH), all studies were performed in the free water flow and at the normal pH of tap water. It was concluded that arsenite concentration was lowered to below 10 µg/L with adsorption. These results showed that GIH adsorption can be used to remove arsenite concentration of 0.1 and 0.5 g/L from water supplies. © 2009, Taylor & Francis Group, LLC