Phosphorescence
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Phosphorescence is a process where a substance absorbs energy which is then slowly released as light. Some key points: - Phosphorescence was first discovered in the 17th century in barium sulphide. Other early discoveries included calcium chloride and calcium sulphide. - Phosphors are chemicals that emit light when exposed to a different wavelength, and are used in things like fluorescent lights and glow-in-the-dark toys. - Chemiluminescence is a related process where light is created via a chemical reaction rather than being slowly released. - Phosphorescent paints use phosphors like zinc sulfide or strontium aluminate and are used for things like
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Phosphorescence
Phosphorescence is the process by which materials emit light after absorbing radiation or energy. It was first observed in the 17th century but not studied scientifically until the 19th century. Phosphorescent materials store absorbed energy and release it slowly as light over minutes or hours by trapping electrons in an excited state. There are two types of photoluminescence - fluorescence which emits light quickly, and phosphorescence which emits light slowly. Common phosphorescent materials include zinc sulfide and strontium aluminate.
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Phosphorescence
Phosphorescence is the process by which materials emit light after absorbing radiation or energy. It was first observed in the 17th century but not studied scientifically until the 19th century. Phosphorescent materials store absorbed energy and release it slowly as light over minutes or hours by trapping electrons in an excited state. There are two types of photoluminescence - fluorescence which emits light quickly, and phosphorescence which emits light slowly. Common phosphorescent materials include zinc sulfide and strontium aluminate.
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Phosphorescence is a type of photoluminescence where absorbed energy is released slowly as light. It allows "glow-in-the-dark" materials to store light energy and release it over time. The first scientific observations of phosphorescence were of the Bologna Stone in 1602 and other substances that glow after heating or light exposure. Phosphors are chemicals that emit light when exposed to different wavelengths and are used in fluorescent lights and toys. Phosphorescent paint contains phosphors like zinc sulfide or strontium aluminate and is used for escape paths, decorations, and temperature detection. Tritium, a radioactive hydrogen isotope, is used in watches due to its long-lasting fluorescent glow from
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MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
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◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
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8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
The binding of cosmological structures by massless topological defects
Assuming spherical symmetry and weak field, it is shown that if one solves the Poisson equation or the Einstein field
equations sourced by a topological defect, i.e. a singularity of a very specific form, the result is a localized gravitational
field capable of driving flat rotation (i.e. Keplerian circular orbits at a constant speed for all radii) of test masses on a thin
spherical shell without any underlying mass. Moreover, a large-scale structure which exploits this solution by assembling
concentrically a number of such topological defects can establish a flat stellar or galactic rotation curve, and can also deflect
light in the same manner as an equipotential (isothermal) sphere. Thus, the need for dark matter or modified gravity theory is
mitigated, at least in part.
Randomised Optimisation Algorithms in DAPHNE
Slides from talk:
Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
Austrian-Slovenian HPC Meeting 2024 – ASHPC24, Seeblickhotel Grundlsee in Austria, 10–13 June 2024
https://ashpc.eu/
Direct Seeded Rice - Climate Smart Agriculture
Direct Seeded Rice - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
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The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
Basics of crystallography, crystal systems, classes and different forms
Basics of crystallography, crystal systems, classes and different forms
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
The binding of cosmological structures by massless topological defects
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ESR spectroscopy in liquid food and beverages.pptx
ESR spectroscopy in liquid food and beverages.pptx
aziz sancar nobel prize winner: from mardin to nobel
aziz sancar nobel prize winner: from mardin to nobel
The cost of acquiring information by natural selection
The cost of acquiring information by natural selection
Phosphorescence
- 1. PHOSPHORESCENCE By: Eloy Isidro, Mario García & Kevin Garrido
- 2. INDEX 1. Definition 2. Discovery 3. Phosphor 4. Chemiluminescence 5. Luminous paint 6. Tritium 7. Materials 8. Phosphoroscope 9. Phosphorescence in nature
- 3. DEFINITION • In simple terms, phosphorescence is a process in which energy absorbed by a substance is released relatively slowly in the form of light. • This is in some cases the mechanism used for "glow-in-the-dark" materials which are "charged" by exposure to light.
- 4. DISCOVERIES AND SCIENTISTS • The first discovery of phosphorescence which attracted scientific attention was that of the Bologna Stone (barium sulphide), by Vincenzo Cascariolo in 1602. • This was followed by the discovery of a number of substances which become luminous either after heating or exposure to light: Homberg´s phosphorus(obtained by heating calcium chloride) John Canton´s phosphorus(calcium sulphide) Balduin´s phosphorus(calcium nitrate).
- 5. PHOSPHOR ● Phosphor is a chemical compound which emits light when it is exposed to the light of a different wavelength. ● Sometimes this element can be confused with phosphorus but there are no similarities between them. ● We can find this element in fluorescent bulbs, toys or safety signs in buildings.
- 6. CHEMILUMINESCENCE • Some examples of glow-in-the-dark materials do not glow by phosphorescence. • In chemiluminescence, an excited state is created via a chemical reaction.
- 7. LUMINOUS PAINT • Phosphorescent paint is made from phosphors such as silver-activated zinc sulfide or doped strontium aluminate. • Escape paths in aircraft and decorative use such as "stars" applied to walls and ceilings. • Phosphorescent paint can be used for temperature detection or degradation measurements known as phosphor thermometry.
- 8. Tritium & luminosity in watches ● Tritium is a radioactive isotope of hydrogen very difficult to find on Earth, it was first discovered in 1934. ● This isotope can damage our health or contaminate the environment, but it is still used for nuclear weapons or controlled nuclear fusion. ● Also, this material is used in watches because the electrons produced by tritium create a fluorescent light that can last up to 20 years. Obviously tritium in watches is hermetically closed inside small glass tubes.
- 9. MATERIALS • Common pigments used in phosphorescent materials include zinc sulfide and strontium aluminate. • Everyday examples of phosphorescent materials are: • the glow-in-the-dark toys • stickers • paint • clock dials
- 10. PHOSPHOROSCOPE • A phosphoroscope is a device used in observing and measuring the persistence of phosphorescence after the source of radiation has been removed (after it has been excited). • It was invented in 1857 by the physicist A.E.Becquerel.
- 11. Phosphorescence in nature ● Bioluminescence is the emission and production of light by a living organism, this type of chemiluminescence is produced when a pigment and an enzyme join in a chemical reaction. ● Bioluminescence is used by animals for communicating, imitating other organisms, illuminating or even camouflaging. ● Sometimes the sea water can illuminate by some plankton with this kind of bioluminescence, this is one of the most beautiful events that bioluminescence can produce.
- 12. THE END THANK YOU FOR YOUR TIME :)
Editor's Notes
- https://en.wikipedia.org/wiki/Luminous_paint