Xem 1-20 trên 423 kết quả Absorption
  • Bài giảng Phương pháp quang phổ hấp thụ nguyên tử (Atomic Absorption Spectroscopy AAS) nêu lên nguyên tắc đo ASS, cấu tạo máy quang phổ hấp thụ nguyên tử, bộ phận tán sắc, máy thu nhận tín hiệu, chọn các thông số của máy thật tối ưu.

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  • Atomic Absorption Spectroscopy is an analytical technique used for the qualitative and quantitative determination of the elements present in different samples like food, nanomaterials, biomaterials, forensics, and industrial wastes. The main aim of this book is to cover all major topics which are required to equip scholars with the recent advancement in this field. The book is divided into 12 chapters with an emphasis on specific topics.

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  • The atomic absorption spectrometry uses absorption of light of intrinsic wavelengths by atoms. All atoms are classified into those having low energies and those having high energies. The state having low energies is called the ground state and the state having high energies is called the excited state. The atom in the ground state absorbs external energies and is put in the excited state. For example, sodium is mainly in two excited states, having higher energies by 2.2eV and 3.6eV respectively than in the ground state, as shown in Fig. 1.1.

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  • Since this book was first published in 1998, there have been significant advances in our understanding of the morphology of the skin and the properties that govern the transport of molecules into and across the three major strata. The multitude of data that has been generated has allowed the development of predictive models for both the rate and extent of dermal absorption and has increased our ability to predict the likelihood of local toxic events subsequent to solute penetration and permeation.

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  • Tham khảo sách 'nickel and the skin absorption, immunology, epidemiology, and metallurgy', y tế - sức khoẻ, y học thường thức phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • When water or soil has the presence of a metal at a certain level, the metal can inhibit or stimulate the absorption of other metals in plants. Therefore, the study on competitive absorption among metals in plants is very necessary. The aim of this study is to find out the competitive absorption between Cu2+ and Pb2+ from polluted soil to lettuce.

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  • The results are compared with those in the case of one-photon absorption process. The calculations demonstrate that two-photon absorption process is sufficient strong to be detected in CR.

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  • Part 1 book “Predictive methods in percutaneous absorption” has contents: Skin structure and physiology, methods for the measurement of per cutaneous absorption, mathematical treatments and early models of skin permeability, the new breadth of research in the field.

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  • Part 2 book “Predictive methods in percutaneous absorption” has contents: Algorithms for estimating permeability across artificial membranes, other approaches to modelling percutaneous absorption, squiggly lines and random dots—you can fit anything with a nonlinear model, the devil is in the detail,… and other contents.

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  • In this work, the X-ray absorption fine structure (XAFS) spectra of bcc crystals and their Fourier transform magnitudes have been studied based on the anharmonic correlated Debye model high-order expanded Debye-Waller factors. The many-body effects are taken into account in present one-dimensional model based on the anharmonic effective potential that includes interactions of absorber and backscatterer atoms with their first shell near neighbors, where the Morse potential is assumed to describe the single-pair atomic interaction.

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  • The optimizedmaterial showed a broad absorption in the region from ultra violet to near infra-red and the better of luminescence ability than the pristine conducting polymers. The remarkable improvements in photoluminescence of the blends provide useful information to the application of this material in fabrication of optical – electronic devices.

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  • 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.

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  • 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.

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  • The magnetic properties of the nanoparticle powders are strongly dependent on the preparation conditions. The milling process produces damages and defects not only on the surface, but also the crystal structure inside the particles, that cause an undesired strong reduction of saturation magnetization (Ms) and an increase of coercivity (Hc). A suitable post-milling heat treatment is able to heal the particles and recover most of their saturation magnetization and magnetic softness. The nanoparticles are then mixed with paraffin for microwave and radar absorption measurements.

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  • The analytic expression for absorption power of a strong electromagnetic waves caused by confined electrons in quantum well is obtained in the case of electron-optical phonon scattering. Nonlinear optically detected electrophonon resonance (ODEPR) effect in a specific GaAs/AlAs quantum well with triangular potential is investigated.

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  • A method for characterizing pigmented bacteria based on the numerical analysis of their carotenoid absorption spectra was examined. To achieve this, some non-phototrophic pigmented bacteria that were isolated from various environments and closely related types of species were used.

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  • The optimized material showed a broad absorption in the region from ultra violet to near infra-red and the photoluminescence quenching higher than 90%. The obtained results provide further insight into photophysics of the heterojunction system and device performance improvement by using this system as an active layer.

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  • The results indicated a large dielectric loss and strong thickness dependence of absorption capacity. The maximum absorption coefficient (RL) is of order -13.6 dB, corresponding to the achieved absorbance of 96.9% for the 2.6 mm of sample thickness. The experimental results are consisted with our simulation calculation.

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  • This book comprises the contributions of several authors in the area of polymer physics by application of conducting polymers; hydrogel films on optical fiber core; thin film polymers; PDLC films application; photopolymers for holographic media; microwave absorption and EMI shielding behavior of nanocomposites based on intrinsically conducting polymers and graphene and carbon nanotubes; in the area of polymer synthesis of conducting polymers; oxidative polymerization of aniline; electro reductive polymerization; polysilanes with ordered sequences; radiation cross-linking poly(urethan...

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  • Atomic Absorption, Fundamentals and Applications, Different Regions, Absorption Spectrophotometry, Fresh and Deparaffinized, Antioxidant Properties

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