Radiation absorption

Part 1 book "Introductory quantum optics" includes contents: Introduction, field quantization, coherent states, emission and absorption of radiation by atoms, quantum coherence functions, beam splitters and interferometers.

165p dianmotminh01 17-05-2024 4 2   Download

Part 1 book "Foundations of modern physics" includes content: Gas properties; chemistry; electrolysis; the electron, heat and energy; absolute temperature; entropy; kinetic theory and statistical mechanics; transport phenomena; the atomic scal; black body radiation; photons; the nuclear atom; atomic energy levels; emission and absorption of radiation.

138p muasambanhan07 18-02-2024 2 1   Download

Ebook "Percutaneous absorption of UV filters contained in sunscreen cosmetic products: Development of analytical methods" describes the development and validation of analytical methods to estimate the processes set in motion by percutaneous absorption of UV filters in sunscreen cosmetic products. León describes these methods in both in vitro and non-invasive in vivo methodologies. Currently dermatologists recommend the use of sunscreen products not only under conditions of extreme exposure to the sun but also in daily situations.

224p nhanphanguyet 28-01-2024 3 2   Download

Part 1 book "The physics of nuclear reactors" includes content: Fundamentals of nuclear physics, interaction between neutrons and matter, interaction of electromagnetic radiation and charged particles with matter, neutron slowing down, resonant absorption.

357p muasambanhan02 18-12-2023 6 3   Download

With the development of radar (Radio Detection and Ranging) systems, the study of materials with the capability to block and reduce the reflected electromagnetic radiation to avoid or confuse detection systems, or to protect sensitive devices and living beings exposed to electromagnetic radiation, has become a topic of great interest.

20p viberbers 09-08-2023 3 3   Download

Previous calculations of the γ dose given to Risø Calibration Quartz (RCQ) were performed using mass absorption and mass attenuation coefficients. In this paper, we update the γ dose given to RCQ using Geant4 simulations and provide a comparison with three other γ sources in Denmark.

5p vironald 15-12-2022 13 3   Download

The paper "The photoluminescence enhancement of Mn2+ ions and the crystal field in ZnS:Mn nanoparticles covered by polyvinyl alcohol" report the synthesis of ZnS:Mn/PVA nanoparticles by second method, in which PVA solution is mixed from the beginning with the initial solutions used to synthesize ZnS:Mn nanoparticles. The microstructures, morphology of ZnS:Mn/PVA nanoparticles, the PL enhancement of Mn2? ions by different PVA mass, the absorption and radiation transitions in the ZnS:Mn crystals and the crystal field strength Dq are investigated and explained.

17p runordie3 27-06-2022 6 2   Download

Ebook Principles of lasers and optics includes 7 contents: Scalar wave equations and diffraction of laser radiation, Gaussian modes in optical laser cavities and Gaussian beam optics, Guided wave modes and their propagation, Guided wave interactions and photonic devices, Macroscopic properties of materials from stimulated emission and absorption, Solid state and gas laser amplifier and oscillator, Semiconductor lasers.

262p coga81 26-06-2022 47 2   Download

Plant absorption of ultraviolet (UV) radiation can result in multiple deleterious effects to plant tissues. As a result, plants have evolved an array of strategies to protect themselves from UV radiation, particularly in the UV-B range (280–320 nm).

5p vijichea2711 28-05-2021 11 1   Download

The performance of a microwave absorbing material (MAM) is often characterized by a negative reflection loss (RL) which is due to the material’s strong absorption and weak reflection of electromagnetic radiation. An absolute absorption can theoretically be achieved in a MAM that has equal permittivity and permeability (er=ur) to satisfy the impedance matching condition Z=Z0 (Z and Z0 are the intrinsic impedance of the material and the impedance of incident medium, respectively).

10p tamynhan9 02-12-2020 8 0   Download

The analytic expressions for the absorption coefficient (ACF) of a weak electromagnetic wave (EMW) caused by confined electrons in the presence of laser radiation modulated by amplitude in doped superlattices (DSL) are obtained by using the quantum kinetic equation for electrons in the case of electron–optical phonon scattering.

11p tamynhan8 04-11-2020 15 2   Download

Among the technological processes that require significant energy consumption, a significant role is played by the heating processes carried out by electric infrared heaters.

8p lucastanguyen 01-06-2020 12 1   Download

The commercial nanoparticles ZnO with - P63mc hexagonal structure, particle size of hundreds of nanometer and band gap energy about of 3.26 eV have been used on photocatalyst for methylene blue. The results showed that: as increasing irradiated time from 30 minutes to 120 minutes by 365 nm radiation of Narva LT 18W ultra - violet lamp, the color of methylene-blue and ZnO mixture were depleted gradually, in which the absorptance and photoluminescence intensity were also decreased.

8p viedison2711 03-09-2019 12 1   Download

In this report, we experimentally and numerically demonstrated a simple metamaterial structure, which perfectly absorbs the microwave radiation. Samples are prepared using the photo-lithography technique and measured by the standard microwave vector network analyzer. Simulations using the finite integration technique are performed to explore the possible mechanism of the observation. It is found that the absorbed energy not only dissipates via material losses, as it was believed, but also reradiates as secondary sources.

7p thithizone 16-07-2019 20 0   Download

After the absorption of the photons, during the photovoltaic conversion process, one part of the radiation remains unabsorbed causing the cell to overheat and thus a drop in efficiency. The purpose of this study is to explore the effect of junction temperature, geographic coordinates as well as the season on the electrical performance of the photovoltaic cell.

9p vioishi2711 01-07-2019 12 1   Download

The present work aims to report the consequences of DarcyeForchheimer medium in flow of Cross fluid model toward a stretched surface. Flow in porous space is categorized by DarcyeForchheimer medium. Further heat transfer characteristics are examined via thermal radiation and heat generation/absorption. Transformation procedure is used.

7p minhxaminhyeu3 25-06-2019 13 0   Download

(bq) part 1 book “radiobiology for the radiologist” has contents: physics and chemistry of radiation absorption, molecular mechanisms of dna and chromosome damage and repair, cell survival curves, radiosensitivity and cell age in the mitotic cycle, fractionated radiation and the dose-rate effect,… and other contents.

475p dien_vi09 13-10-2018 20 2   Download

The excitation spectra recorded at 300 K on the other hand featured a strong photoluminescence band around 344 nm, which were assigned to the near band-edge absorption transition of ZnS host lattice, in addition with three weaker bands relating to the absorption transitions of [6A1( 6S) → 4T2( 4D)]: 430 nm, [6A1( 6S) → 4A1( 4G) – 4E(4G)]: 468 nm, and [6A1( 6S) → 4T2( 4G)]: 492 nm of Mn2+(3d5 ) cations. It was shown that the capping affected only the intensities of emissions bands.

10p thuyliebe 09-10-2018 29 1   Download

We investigate the transient absorption phenomena in synthetic diamonds obtained by High Pressure High Temperature (HPHT) and Chemical Vapor Deposition (CVD) methods. The aim of our study is to search inorganic crystalline media combining ionizing radiation and investigate their detecting properties and non-linear absorption of ultra-short laser pulses. The pump-probe technique with 140 fs laser pulses was used for the investigations.

7p thuyliebe 08-10-2018 18 0   Download

Hydrogels composed of polyvinyl pyrrolidone (PVP), polyethylenglycol (PEG) and kappacarrageenan (KC) were prepared by radiation crosslinking method. The equilibrium water absorption of hydrogel PVP/KC (A) and PVP/PEG/KC (B) were 45 and 85 g(H2O)/g dried gel, respectively. The n values of the equation Mt /M = ktn were determined to be of 0.6396 for hiđrogel A and 0.9984 for hydrogel B. The water transport mechanism follows the fickian diffusion for hydrogel A, while relaxation diffusion is dominated for hydrogel B. The water vaporization of hiđrogels was also investigated.

4p uocvong04 24-09-2015 42 2   Download