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- 2018
- sodium lighting system
- modeling
- radiation curves
- LED lighting system
- software goniophotometer
- upper half-space
- Electrical Engineering and Automation
- VSB-TU Ostrava
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AIP Conference Proceedings [Author(s) THE 3RD INTERNATIONAL SEMINAR ON CHEMISTRY: Green Chemistry and its Role for Sustainability - Surabaya, Indonesia (18–19 July 2018)] - Green synthesis of silver nanoparticles using photo-induced reduction method
摘要： Silver Nanoparticles (AgNPs) has been successfully synthetized in this study using photoinduced reduction method with monochromatic light. In this method we use sodium citrate as capping agent without additional reducing agent. Silver nanoparticles characterized using Ultraviolet-Visible Spectroscopy (UV-Vis) and X-ray Diffraction (XRD). The synthetized AgNPs show that wavelength of light can affect the properties of AgNPs based on absorption spectra of UV-Vis. XRD measurement showed the characteristic peak of silver at 2θ of 38.060, 44.140, 64.470, and 77.400.
关键词： Photochemistry,Reduction,Sodium Citrate,AgNPs,Monochromatic light
更新于2025-09-23 15:23:52
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Skeletal tailoring of two-dimensional π-conjugated polymer (g-C3N4) through sodium salt for solar-light driven photocatalysis
摘要： Structural modi?cation of graphitic carbon nitride (g-C3N4) by addition of sodium salt has been investigated for solar light-driven photocatalysis. The results from optical study indicates that the incorporation of sodium ions decreases band gap energy along with upward shifts of conduction and valence band. However, no substantial increment in surface area was observed, but morphological and optical studies con?rm that the structural deformation of g-C3N4 through sodium salt activates the ?n π * electronic transition, which can extend the absorption range to the red region attributing towards a reduced charge recombination, narrow band gap, and high conduction band edge. Furthermore, the photocatalytic activity of sodium doped g-C3N4 (0.6Na-g-C3N4) was examined under solar light for di?erent operational conditions in terms of phenol degradation of real tannery e?uent, and it was found that under optimum experimental conditions, i.e., 5 h solar irradiance, pH 5, H2O2 concentration 800 mg/L with a ?ow rate of 4 L/h, 0.6 Na- g-C3N4 exhibits 84.22% reduction in phenol while for g-C3N4 only 63.53% was observed.
关键词： Graphitic carbon nitride,Photocatalytic activity,Charge recombination,Solar irradiance,Band gap,Sodium salt
更新于2025-09-23 15:23:52
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[IEEE 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Vladivostok, Russia (2018.10.3-2018.10.4)] 2018 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon) - Quality Control of Sodium High-Pressure Lamps by the Singular Decomposition Method
摘要： We created a mathematical model of a sodium high-pressure lamp. This model is used in production before sending lamps to the consumer. To develop the model, we used a mathematical model. An analytical method was used to describe the operation of a sodium lamp based on differential equations. We also used the singular value decomposition algorithm to find the coefficients of the ARMA model. Also, the transfer function of the ARMA model was obtained. Then we tested the models to control the quality of sodium lamps in production. The obtained results of the simulation coincide with the experimental results. A graphical dependence is obtained in the case when the standard deviation is 1. Using a series of tests based on the singular value decomposition method, we confirmed the adequacy of elaborated model by Kolmogorov-Smirnov criterion.
关键词： experimental research,mathematical model,sodium lamp
更新于2025-09-23 15:23:52
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Durability and purification performance of concrete impregnated with silicate and sprayed with photocatalytic TiO2
摘要： This paper proposes an integrated concrete surface treatment with surface enhancement via silicate impregnation and surface spraying with TiO2 (a photocatalyst). In this work, two types of silicate-based materials, sodium alumina silicate (SAS) and colloidal silica (COS) were used. Various tests were carried out to characterize the silicate properties and engineering performance of the impregnated concrete. In addition, the purification performance in concrete sprayed with TiO2 was investigated. Concrete impregnated with silicate and sprayed with TiO2 showed an improvement in the durability and mechanical performance because of the addition of the CSH gel and TiO2 barrier. After impregnation, the TiO2 applied by spraying retained good performance for the removal of acetaldehyde and methyl orange.
关键词： Sodium alumina silicate,Durability performance,Purification performance,Photocatalyst,Colloidal silica
更新于2025-09-23 15:22:29
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Ratiometric fluorescence imaging for sodium selenite in living cells
摘要： Sodium selenite as a common selenium-containing agent has been extensively studied for human health, especially cancer prevention and treatment. However, precisely evaluating the dynamic changes of sodium selenite at cellular and molecular level in these pharmacological and pathophysiological studies is still challenging. Developing the chemical tools that enable the quantification of sodium selenite in vivo with high spatial and temporal fidelity thus can provide an efficient solution to this challenge. Here, we report the design, synthesis and biological evaluation of ratiometric sodium selenite fluorescent probe (HBTN-Se) for quantitative ratiometric fluorescence imaging of sodium selenite concentration fluctuations in living cells. A strategy for sodium selenite quantification has been achieved effectively through using a highly selective, rapid and biocompatible hydroxyl-deprotecting reaction. The ratiometric fluorescence imaging with HBTN-Se is constructed to precisely monitor changes in sodium selenite levels in living cells. Moreover, HBTN-Se is capable of visualizing differences in sodium selenite levels between normal cells and cancer cells, establishing the utility of this ratiometric detection platform for assessing the correlation between physiological effects of sodium selenite and its levels in living cells.
关键词： Quantitative determination,Fluorescent probe,Sodium selenite,Ratiometric fluorescence imaging
更新于2025-09-23 15:22:29
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Acceleration of tungsten doping on vanadium dioxide (VO2) by alkali species
摘要： The monoclinic vanadium dioxide, VO2(M), undergoes reversible phase transition from monoclinic (semiconductor) to tetragonal (metal), which exhibits a good thermochromic property. VOSO4, as a vanadium source, is easy to handle produces VO2(M) under mild condition in the presence of alkali species. In this study, the effects of the additions of NH4HCO3, NH3·H2O, and NaOH on the VO2 crystal formation with/without tungsten doping for thermochromicity were investigated. NaOH, the strongest base of the three, provided the strongest and narrowest x-ray diffraction peak, while NH4HCO3, the weakest base, provided the opposite. Interestingly, for the tungsten doping to adjust the transition temperature, the use of NH4HCO3 was more suitable due to the possibility of a slow crystal frame formation as compared to the use of NaOH.
关键词： Sodium hydroxide,Vanadium dioxide,Ammonium hydrogen carbonate,Ammonium hydroxide,Tungsten doping
更新于2025-09-23 15:22:29
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<sup>18</sup> F-Sodium Fluoride Positron Emission Tomography and Plaque Calcification
摘要： 18F-sodium fluoride (18F-NaF) was introduced as a tracer for imaging skeletal diseases in 1962 and was approved by the Food and Drug Administration in 1972.1 Recently, with the increased availability of positron emission tomography (PET) scanners there has been a surge in clinical utilization of 18F-NaF imaging for oncological applications. The incidental observation, nearly a decade ago, of 18F-NaF uptake in the vasculature in patients undergoing PET imaging for cancer has led to a growing number of investigations exploring the potential role of this tracer in atherosclerosis.2–4 However, the biological correlates of 18F-NaF imaging in the vasculature, and its potential role in risk stratification of patients and prospective identification of vulnerable plaques remain incompletely characterized. In this issue of the Journal, Creager et al5 address some of these gaps by exploring the relationship between 18F-NaF binding and the size of microcalcifications using a 3-dimensional hydrogel platform.6 In agreement with a previous publication,2 their study finds that smaller and more numerous microcalcifications (ie, higher surface areas of calcifications) are associated with higher 18F-NaF binding when compared with fewer larger calcifications.5 The study also provides ex vivo proof-of-concept evidence for the correlation between 18F-NaF binding and foci of ongoing calcification in mouse and human atherosclerotic plaques.5
关键词： Editorials,sodium fluoride,atherosclerosis,inflammation,positron emission tomography
更新于2025-09-23 15:22:29
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Influence of phototherapy on adhesive strength and microleakage of bleached enamel bonded to orthodontic brackets: An Invitro study
摘要： Aim: The aim of the present in-vitro study was to explore bleached enamel reversal with phototherapy (Er,Cr:YSGG) when using two dissimilar bonding system to bond brackets on microleakage and shear bond strength. Material and Methods: Amongst one twenty samples, ninety samples were bleached using 35% hydrogen peroxide. After the bleaching procedure, the teeth were randomly divided into three groups according to surface conditioning treatment (n=30 each). Group 1: treated with Er,Cr:YSGG (ECL) Group 2: 10% sodium ascorbate (SA) and Group 3: Bleached only (BO). Based on the type of adhesive, specimens were further classified into eight subgroups. In subgroup 1,2,3 and no treatment (NT) (n=15) adhesive Transbond XT was applied on already etched surface and these subgroups were named as NT-TEP, BO-TEP, ECL-TEP and SA-TEP. Similarly, in subgroup 5,6,7 and NT specimens (n=15) were conditioned with Transbond Plus self-etching primer and these subgroups were named as NT-SEP, BO-SEP, ECL-SEP and SA-SEP. Samples from each subgroup were exposed to increasing load for evaluation of shear bond strength. Microleakage among subgroups were tested by immersing samples in Methylene blue prior one day. Analysis of variance and Tukey multiple comparisons test was used to assess data. Results: The maximum and minimum bond strength was observed in group NT-TEP [17.14(2.54)] and BO-SEP [6.14(0.215)] respectively. Samples conditioned with phototherapy ECL-TEP [16.14(1.231)] exhibited comparable bond strength to specimens conditioned with sodium ascorbate (SA-TEP) [16.72(1.298)]. Similarly, bond strength values of ECL-SEP [13.43(0.921)] and SA-SEP were comparable. The highest microleakage score was demonstrated in BO-SEP [83.21(38.21)] whereas, the lowest microleakage scores were displayed in NT-TEP [23.73(13.45)]. Conclusion: Er,Cr:YSGG phototherapy reversal on bleached enamel with etch and rinse adhesives has a potential to be used in clinical settings alternate to conventional sodium ascorbate when bonding orthodontic brackets.
关键词： Microleakage,Bleached enamel,Sodium Ascorbate,Phototherapy,Bond strength
更新于2025-09-23 15:22:29
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Radiation of the Luminous Flux Into the Upper Half-Space in Wils - Building Design
摘要： The article focuses on the further verification of the software goniophotometer in the BUILDING DESIGN computational program in terms of the possibility of calculating the radiation of the liminous flux flowing into the upper half- space from public lighting systems [1]. Software goniophotometer was tested by the previous verification for the accuracy of calculations of the direct and indirect component of luminaire luminous flux. The superstructure was conceived as the possibility of inserting a network of calculating points in the shape of a sphere. We can imagine the points showing normal illuminance towards the centre of the sphere as a lux meter sensor. The system thus designed duplicates the function of a real goniophotometer, a photometric laboratory instrument that measures luminous intensity or luminous intensity curves. The principle of a goniophotometer is that it allows to measure the luminous intensity in different planes and at different angles, which can be easily interpreted by a sphere with a network of calculation points. The density of the calculation points can be entered in an angular step according to the standard luminaire measurement plan C, γ. The goal of implementing such a network of calculation points is to extend the possibilities of a computational program for modelling the luminous intensity curves of existing luminaires as well as newly composed luminaires. The main goal is calculating the radiation of the liminous flux flowing into the upper half-space from the outdoor lighting systems. It will be the basis for further astronomical calculations that focus on distracting light and increased sky luminance. Based on the testing, it will be possible to create model of lighting system in some city or district of the city by inserting LDT data of real luminaires, thus creating a real lighting system with real building models. From the resulting model, it will be possible to quantify the proportion of the direct and indirect luminous flux flowing into the upper half-space.
关键词： sodium lighting system,modeling,radiation curves,LED lighting system,software goniophotometer,upper half-space
更新于2025-09-23 15:21:21
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The fox and the hound: in-depth and in-grain Na doping and Ga grading in Cu(In,Ga)Se <sub/>2</sub> solar cells
摘要： Cu(In,Ga)(S,Se)2 (CIGS) thin film solar cells require appropriate depth and lateral distributions of alkali metal dopants and gallium to attain world record photovoltaic energy conversion. The two requirements are interdependent because sodium is known to hamper In/Ga interdiffusion in polycrystalline films. However, such a fact is challenged by recent findings where sodium appears to enhance In/Ga interdiffusion in monocrystalline films. This contribution reviews closely the two cases to the benefits of grain boundary engineering in CIGS. A computational model reveals why Na induces In accumulation at CIGS grain boundaries, confining Ga to grain interiors. The positive technological implications for wider gap chalcopyrites are stressed.
关键词： sodium doping,gallium grading,CIGS,solar cells,grain boundary engineering
更新于2025-09-23 15:21:01