Blue Emissions

The presence of Balmer emission lines is an indicator of magnetic activity in stars. This paper presents the spectroscopic observations at blue wavelengths of nearby young brown dwarfs with previously detected lithium.

6p vimichaelfaraday 28-12-2023 5 3   Download

The paper presents the results of the photoluminescence and thermoluminescence behaviour of Mn2+-doped Zn2 SiO4 powder synthesized by high - energy planetary ball milling technique followed by calcination in air at 1250 °C.

6p vivirginia2711 09-12-2020 13 0   Download

Document present content why measure carbon stocks; conceptualizing the project and developing a field measurement plan; field sampling of soil carbon pools in coastal ecosystems; remote sensing and mapping.

186p kequaidan6 10-07-2020 13 3   Download

Light absorption of the most plants is in range of blue (440 nm), deep-red (660 nm) and far-red around 700-740 nm. The deep-red and far-red light play important roles in reactions of photomorphogenesis of plants. Although red emission phosphors have been researched extensively for white light-emitting diodes, deep-red and far-red emission phosphors for plant growth have been reported inadequately. Thus, in this work, far-red emitting CaYAlO4:Mn4+ phosphor was synthesized by co-precipitation method coupled with various annealing temperature from 800 oC to 1300 oC for 5 h.

7p nguyenminhlong19 22-04-2020 20 1   Download

The synthesis of graphene (Gr) - gold (Au) nanoparticle (NP) composite was achieved using continuous ultraviolet wave exposure. The functional groups were investigated with FTIR spectra. From the Raman spectra, D-band and G-band of Gr were identified. As a result, the uniform deposition of nanometer-sized Au NPs on the Gr sheets was observed from the field emission scanning electron microscope (FE-SEM) images. The photodegradation of methylene blue in aqueous solutions was studied using various photocatalysts, including neat TiO2, Gr/TiO2 and Gr-Au/TiO2 composites.

7p 12120609 23-03-2020 22 1   Download

In this research, graphene aerogel (GA) was fabricated by chemical reduction method, in which ethylenediamine (EDA) was used as a reducing and functionalising agent. The characterisation of GA was studied by density, field-emission scanning electron microscope, Brunauer-Emmett-Teller (BET) specific surface area, Fourier transform infrared spectroscopy, and X-ray diffraction. The results of the analysis showed that GA exhibits low density, ranging from 4-8 mg/cm3 , high porosity, and BET specific surface area changes from 176 to 1845 m2 /g.

6p caygaocaolon1 13-11-2019 36 2   Download

By doping of Cu2+ ion, the absorption wavelength is shifted towards the lower wavelength being an evidence for an increasing band gap. The emission spectrum of pure ZnS has a green emission band centred at around 520 nm. By doping Cu2+ ion, the peak of the green band in the luminescence spectra were transferred to 516 nm and appeared a strong blue peak at 440 nm. The reasons of these will be discussed in this paper.

7p cathydoll4 21-02-2019 22 1   Download

This result is elucidated through the quantum confinement effect. The PL emission shows a pronounced peak at 505 nm that is significant blue shift compared to thin layer MoS2. The interpretation of this phenomena is also discussed in detail.

8p letanhien2309 19-02-2019 15 1   Download

White light emitting diodes (WLEDs) were made by coating organic and inorganic hybrid composites on blue LED chips. Y3Al5O12:Ce (YAG:Ce) nano powder prepared by lowtemperature Sol-Gel method exhibited a broadband green emission spectrum with the peak at 521 nm.

7p thuyliebe 12-10-2018 16 0   Download

An investigation of the morphology, structure, composition and optical properties of ZnS:Mn2+ microbelts grown by the thermal evaporation method using ZnS powder and MnCl2.4H2O powder as precursor materials is presented. The SEM images of the products show that ZnS:Mn2+ microbelts are bigger and shorter than ZnS microbelts. EDS reveals that the composition of the microbelts include Zn, S, O, Mn and Cl elements.

6p truongtien_09 08-04-2018 32 1   Download

In the experiments, the chlorophyll fluorescence was measured under steady-state conditions, in 20 min predarkened intact leaves, and we have employed as the excitation source, a blue LED at 405 nm with 10 nm of bandwidth and delivering a maximum power of 2.2 mW. The choice relies upon the fact that its wavelength resides within the main absorption band of Chl a, producing much higher fluorescence emission intensity.

382p conquynho32 14-09-2012 65 7   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facile synthesis of monodisperse ZnS capped CdS nanocrystals exhibiting efficient blue emission

6p dauphong18 09-03-2012 44 3   Download

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Cavity Enhancement of Single Quantum Dot Emission in the Blue

5p dauphong17 21-02-2012 39 3   Download

Positron emission tomography (PET) activation in migraine. In spontaneous attacks of episodic migraine (A) there is activation of the region of the dorsolateral pons (intersection of dark blue lines); an identical pattern is found in chronic migraine (not shown). This area, which includes the noradrenergic locus coeruleus, is fundamental to the expression of migraine.

5p ongxaemnumber1 26-11-2010 61 2   Download