Surface plasmon enhanced spontaneous emission rate of InGaN/GaN quantum wells probed by time-resolved photoluminescence spectroscopy

We observed a 32-fold increase in the spontaneous emission rate of InGaN/GaN quantum well (QW) at 440 nm by employing surface plasmons (SPs) probed by time-resolved photoluminescence spectroscopy. We explore this remarkable enhancement of the emission rates and intensities resulting from the efficient energy transfer from electron-hole pair recombination in the QW to electron vibrations of SPs at the metal-coated surface of the semiconductor heterostructure. This QW-SP coupling is expected to lead to a new class of super bright and high-speed light-emitting diodes (LEDs) that offer realistic alternatives to conventional fluorescent tubes

Analisis Risiko Kesehatan Lingkungan Paparan Nitrogen Dioksida (No2) Pada Pedagang Kaki Lima Di Terminal Pulogadung Jakarta Timur

Pulogadung bus station is one terminal with a solid transport activity and potentially contribute a lot of air pollution. Motorized transport will produce a variety of gases including NO2 which can cause bad effect on health for example respiratory problems, throat irritation and eye irritation, especially for street vendors who almost 24 hours in the bus station.The purpose of this study was to analyze the risk of exposure to NO2 in Pulogadung Bus Station to transportation activities. The design study is an cross sectional approach of Environmental Health Risk Assessment (ARKL). The population of subject is140 street vendors in Pulogadung Bus Station and a population of object is ambient air in Pulogadung Bus Station. Sample subjects were 60 vendors in Pulogadung Terminal and sample objects the ambient air at four points around the Pulogadung Bus Station. Analysis of data using the steps in ARKL namely hazard identification, dose-response analysis, exposure analysis and risk characteristics.The results showed an average of NO2 concentration measurement results in Pulogadung Terminal in East Jakarta is 0.07141 mg / m3. While the average weight of street vendors in Pulogadung terminal in East Jakarta is 58.32 kg, with an average daily exposure time street vendors is 13 hours per day, the average frequency of exposure per year is 329 days per year and the average duration of exposure street vendors is 15 years old. The conclusion is the concentration of NO2 in Pulogadung Terminal is still below the quality standards established and the average exposure in real time and lifetime of street vendors in Pulogadung Bus Station is still under 1 and otherwise still safe. The calculation of risk estimates in Pulogadung Terminal vendors be at risk of non-cancer due to exposure to NO2 in the next 40 years. The suggestions in this study is street vendor should using PPE when working and reducing working hours

Analisis Risiko Kesehatan Lingkungan Paparan Sulfur Dioksida (So2) Udara Ambien Pada Pedagang Kaki Lima Di Terminal Bus Pulogadung, Jakarta Timur

The contribution of air pollution in urban areas around 87% comes from transportation activities. Pulogadung Bus Station in East Jakarta is one of the potential sites in pollution emissions of SO2 gas. Street vendors are the population most at risk for contamination of vehicle exhaust gases. The purpose of this research was analyze the level of non-carcinogenic health risks of exposure to SO2 against street vendors at Pulogadung Bus Station due to transportation activities. This research used observational research with approach Environmental Health Risk Assessment. The population in this research was 140 street vendors at Pulogadung Bus Station with a sample of 60 street vendors. SO2 measurements performed by pararosanilin method using a spectrophotometer. The results showed the average concentration of SO2 at Pulogadung Bus Station was 133,78 ug/m3 which means it is still well below the standards set by the Governor Decree No. 551 of 2001. The average weight of respondents 58 kg, the average daily exposure time 13 hours/day, the average frequency of exposure 329 days/year and the average duration of exposure for 15 years. The average intake of SO2 real time is 0.01461 mg/kg/day and intake life time is 0.02412 mg/kg/day. The average RQ in real time exposure is 0.5619 mg/kg/day and the life time of exposure is 0.9278 mg/kg/day. Characteristics of non-carcinogenic health risks of exposure to SO2 on street vendors at Pulogadung Bus Station in East Jakarta indicate that as many as 13 street vendors (21.67%) exposure in real time and 19 street vendors (31.67%) in the life time risk exposure resulting from exposure to SO2. The conclusion of this study is street vendors in Pulogadung Bus Station have categories yet non carcinogenic health risk by exposure to SO2

Sustainable nitrogen-doped carbonaceous materials from biomass derivatives.

International audienceNitrogen-doped carbons were produced using hydrothermal carbonization of nitrogen-containing carbohydrates under mild temperature (180 °C). The resulting materials contain significant amounts of nitrogen and display a high degree of aromatization. The nitrogen contents are also retained after further calcination at higher temperatures. All the resulting materials have been thoroughly characterized using X-ray photoelectron spectroscopy, solid state 15N and 13C-nuclear magnetic resonance, elemental chemical analysis, nitrogen adsorption, scanning and transmission electron microscopy. The nitrogen-doped materials proved to have superior performance with respect to their nitrogen-free counterparts in terms of electrical conductivity

Learning object bounding boxes for 3D instance segmentation on point clouds

We propose a novel, conceptually simple and general framework for instance seg-mentation on 3D point clouds. Our method, called3D-BoNet, follows the simpledesign philosophy of per-point multilayer perceptrons (MLPs). The frameworkdirectly regresses 3Dboundingboxes for all instances in a point cloud, whilesimultaneously predicting a point-level mask for each instance. It consists of abackbone network followed by two parallel network branches for 1) bounding boxregression and 2) point mask prediction. 3D-BoNet is single-stage, anchor-freeand end-to-end trainable. Moreover, it is remarkably computationally efficientas, unlike existing approaches, it does not require any post-processing steps suchas non-maximum suppression, feature sampling, clustering or voting. Extensiveexperiments show that our approach surpasses existing work on both ScanNet andS3DIS datasets while being approximately10×more computationally efficient.Comprehensive ablation studies demonstrate the effectiveness of our design

Fostering Work Engagement in Geographically-Dispersed and Asynchronous Virtual Teams

Purpose: The purpose of this paper is to explore the factors that enable work engagement to develop when asynchronous communication is used in virtual team (VT) projects. Design/methodology/approach: Using a qualitative approach, a longitudinal study of an eight-month long VT project was carried out. Data collected included an extensive e-mail archive, project documentation, observation of team meetings and interviews with project members and leaders. Findings: The findings show that VT leaders can actively promote work engagement through the effective use of resources along with appropriate practices that foster its development. They can also sustain and nourish work engagement throughout the different phases of the VT lifecycle project. Research limitations/implications: The study has examined work engagement in asynchronous mediated settings. Future work should involve studying the effect of synchronous communications on work engagement within VTs. Practical implications: Organizations that are interested in promoting effective virtual work practices need to train VT managers on how to keep VT members engaged throughout the various phases of the VT project. Social implications: It is posited that developing work engagement is not a one-off practice, but instead, requires ongoing effort that should be evident and supported across the different phases of the VT lifecycle. Originality/value: This paper forwards an important debate on work engagement in alternative, non-permanent, work settings

Studies on possibility for alleviation of lifestyle diseases by low-dose irradiation or radon inhalation

Our previous studies showed the possibility that activation of the antioxidative function alleviates various oxidative damages, which are related to lifestyle diseases. Results showed that, low-dose X-ray irradiation activated superoxide dismutase and inhibits oedema following ischaemia-reperfusion. To alleviate ischaemia-reperfusion injury with transplantation, the changes of the antioxidative function in liver graft using low-dose X-ray irradiation immediately after exenteration were examined. Results showed that liver grafts activate the antioxidative function as a result of irradiation. In addition, radon inhalation enhances the antioxidative function in some organs, and alleviates alcohol-induced oxidative damage of mouse liver. Moreover, in order to determine the most effective condition of radon inhalation, mice inhaled radon before or after carbon tetrachloride (CCl4) administration. Results showed that radon inhalation alleviates CCl4-induced hepatopathy, especially prior inhalation. It is highly possible that adequate activation of antioxidative functions induced by low-dose irradiation can contribute to preventing or reducing oxidative damages, which are related to lifestyle diseases

Wine, Beer, Snuff, Medicine, and Loss of Diversity - Ethnobotanical travels in the Georgian Caucasus

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