scispace - formally typeset
Search or ask a question

Answers from top 9 papers

More filters
Papers (9)Insight
The plate obtained is suited to the detection of detailed structure of absorption spectra and, by use of a reference spectrum, to the quantitative estimation of absorption.
Therefore, narrow absorption peaks will appear in the spectrum when the temporal window is long enough to resolve the peak.
The method is of use in situations where a knowledge of the fine detail of the absorption spectrum is not needed, but where an accurate reproduction of the absorption over a wide energy range, and of the major structure near the edge, is.
We show that the accuracy of the absorption measurement in a given experiment is largely determined by the spectral lines used for the measurement.
A simulation of the absorption spectrum effectively reproduces the observed spectrum.
The method provides a way to obtain global information on the absorption spectrum without explicitly converging all vibrational eigenstates of the system.
EXPERIMENTAL General The instrument is generally applicable to absorption measurements in the visible spectrum.
Theoretical calculations can well reproduce experimental absorption spectrum data.
It is found that the spatial distribution of 2D probe absorption spectrum can be significantly improved via adjusting the system parameters.

Related Questions

Why are cuvettes tested for background fluorescence before use in research?5 answersCuvettes are tested for background fluorescence before use in research to ensure accurate measurements by minimizing interference from various sources. Background fluorescence can arise from factors like light scattering, endogenous fluorescence of samples, autofluorescence of cells, and luminescent properties of materials. Utilizing cuvettes with low background fluorescence, such as those made from materials like cyclo-olefin copolymer, aids in high-throughput fluorescence measurements of biological samples. Techniques like delayed detection of emission in fluoroimmunoassays help reject temporal background, enhancing analytical sensitivity by distinguishing specific signals from interfering background. Additionally, cuvettes designed with specific binding agents on spherical particles and optical elements can validate cuvettes before assays, ensuring accurate measurements. Testing cuvettes for background fluorescence is crucial for reliable research outcomes.
What is the source of background radiation?4 answersBackground radiation is emitted from various sources such as the sky, earth's crust, food, water, and building materials. It includes terrestrial radiation, cosmic radiation, and exposure to internal radiation. Terrestrial radiation is caused by naturally occurring radioisotopes in rocks, soils, and sands. Cosmic radiation depends on altitude, with higher altitudes having higher radiation doses. Internal radiation comes from radionuclides like 40K, 232Th, and 238U series, which exist in trace levels in ground formations. Other sources of background radiation include nuclear power plants and scatter radiations from atomic bomb tests. Additionally, the sun emits radiation, and radon gas is emitted from the earth. Even everyday objects and foods contain naturally occurring radioactive materials.
What is absorption costing?5 answersAbsorption costing is a costing technique that considers all manufacturing costs, both variable and fixed, as the cost of production. These costs are used to determine the cost of goods manufactured and inventories. Traditional absorption costing systems have been subject to criticism, particularly regarding the allocation of overheads and the choice of appropriate overhead recovery rates. Marginal costing, on the other hand, is a costing technique that only considers variable manufacturing costs when valuing inventories and determining the cost of goods sold. It allocates only variable manufacturing costs to products manufactured. Both absorption costing and marginal costing have their supporters and arguments for and against each method. Absorption costing is used in the calculation of the cost of goods and the determination of the selling price in a case study of a micro enterprise in the retail sector. An accounting system under absorption costing identifies a break-even point and treats managed fixed costs as fixed costs. An accounting system for an income statement under absorption costing includes means for identifying the break-even point and disclosing break-even charts over a computer information network.
What is background radiation?5 answersBackground radiation refers to the natural radiation that is present in the environment. It is a form of energy that is constantly present and comes from various sources such as terrestrial radiation and cosmic radiation. Background radiation can be measured using dosimeters and is expressed in units such as microsieverts per hour (µSv/h) or millisieverts per year (mSv/yr). Studies have been conducted to measure and analyze background radiation levels in different locations, including buildings, schools, and various regions. The results of these studies have shown that background radiation levels are generally within safe limits and do not pose immediate health hazards to the population. In fact, some studies have even suggested that exposure to higher levels of background radiation may have beneficial health effects, such as increased life expectancy and decreased cancer mortality rates.
What is background music?5 answersBackground music is a type of music used in various occasions such as movies and short videos. It plays an important role in setting the atmosphere and expressing emotions in videos. However, current research on automatic music generation for short videos lacks new ideas and focuses on generating music with similar styles. The design of a video background music generation algorithm based on music feature matching can efficiently and effectively generate high-quality background music for videos. Background music in films enhances audiences' attention to scenes, and its tempo does not significantly affect attention levels. In the context of language learning, background music, particularly low complexity music, has been associated with improved performance in recall and translation tasks. In higher education, background music has been largely ignored, but there is evidence that it can benefit students, especially those with musical training.
What is background sound?5 answersBackground sound refers to the informative form of art that provides a more immersive experience in voice conversion (VC) scenarios. It is the secondary sound sources present in the surrounding environment that accompany real-time speech. VC research has mainly focused on clean voices and paid rare attention to VC with background sound. Preserving background sound in VC is challenging due to speech distortion caused by the neural separation model and the mismatch between the source separation model and the VC model. To address this, an end-to-end framework via multitask learning has been proposed, which includes a source separation module, a bottleneck feature extraction module, and a VC module. Additionally, a new dataset called YBSS-200 has been prepared for the classification of background sound in audio recordings containing human speech. In film and media production, ambient sound plays a crucial role in creating the context and spatial experience by providing locational atmospheres and spatial information.

See what other people are reading

Amorphous sillicon photodiode'
5 answers
An amorphous silicon photodiode is a key component in various optoelectronic devices. It typically consists of a photodiode structure with an amorphous silicon layer, electrodes, and sometimes additional layers for improved performance. The use of amorphous silicon in photodiodes offers advantages such as ease of fabrication and compatibility with large-scale production processes. To enhance the efficiency and reduce dark current in amorphous silicon devices, techniques like incorporating nitrogen-doped indium tin oxide films or barrier metal films made of high-melting point metals have been proposed. These innovations aim to improve the overall performance and reliability of amorphous silicon photodiodes for various applications in light detection and energy conversion technologies.
What is the coeffcient of absorption of water for infrared spectroscopy?
5 answers
The coefficient of absorption of water for infrared spectroscopy varies based on factors like temperature, salinity, and molecular structure. Studies have shown that the absorption spectra of water can be influenced by its molecular arrangement, such as in confined spaces like nanochannels, resulting in spectral shifts and enhancements. Techniques like solvent absorption compensation (SAC) have been developed to improve concentration sensitivity and extend path length for protein analysis in aqueous solutions, enhancing signal-to-noise ratios significantly. Additionally, molecular dynamics simulations have been utilized to calculate the IR absorption spectra of liquid water, providing insights into the thermodynamic and dynamic properties of water. Overall, the coefficient of absorption of water for infrared spectroscopy is a complex parameter influenced by various environmental and molecular factors.
What is the relationship between yellow eyes and skin in humans?
5 answers
Yellow eyes and skin in humans can be indicative of various conditions. Yellow eyelids, although uncommon, can be cosmetically concerning. The yellowish tinge observed in the skin can raise concerns of jaundice, as seen in a case study of a 1-year-old boy with yellow-orange discoloration in specific areas. The absorption of radiation, particularly UV radiation, plays a crucial role in triggering biochemical reactions and cellular responses that lead to biologic effects and microscopic alterations in the skin. Additionally, interactions between light exposure on the skin and cholecalciferol, along with the role of darkness in regulating various functions, highlight the complexity of factors influencing skin color and health. These insights emphasize the multifactorial nature of yellow discoloration in both the eyes and skin in humans.
Why xrd peak shifts to higher angle when Nd3 is added as dopant to V2O5?
5 answers
The X-ray diffraction (XRD) peak shifts to higher angles when Nd3+ is added as a dopant to V2O5 due to the formation of a more ordered structure with higher Nd3+ concentrations. This shift indicates changes in the crystal lattice structure caused by the incorporation of Nd3+ ions into the V2O5 matrix, leading to alterations in the diffraction pattern. Additionally, the presence of Nd3+ ions in the V2O5 lattice can influence the lattice parameters and crystal symmetry, resulting in the observed peak shifts in the XRD spectra. The interaction between Nd3+ ions and the V2O5 host matrix can induce structural modifications that manifest as changes in the XRD peak positions, reflecting the dopant's impact on the material's crystalline structure.
How flow cytometery work?
5 answers
Flow cytometry operates by analyzing individual cells in suspension as they flow past a laser beam, generating fluorescence and scattered light signals that are captured by detectors and converted into electronic signals. The technology utilizes lasers to illuminate cells, filters to collect light scatter and fluorescent signals, and detectors to convert these signals into electrical outputs. By using antibodies and dyes targeted at specific cell molecules, flow cytometry enables multiparametric analysis of single cells, with some instruments capable of detecting over 30 parameters simultaneously. Over the years, flow cytometry has evolved from single-parameter detection to high-end multicolor analysis, allowing for the identification and purification of rare cell subpopulations. This advancement has significantly impacted various fields such as cell biology, immunology, and clinical diagnostics.
What are the types of pressure sensors commonly used in AIMDs?
5 answers
Common types of pressure sensors used in AIMDs include force sensing resistors (FSRs), capacitive-type pressure sensors, capacitor pressure sensors (CPS), differential pressure transmitters with single crystal structures, MEMS pressure transducers with isolator diaphragms, and laser type pressure sensors. These sensors vary in their design and functionality, with some utilizing novel technologies like artificial neural networks for accurate pressure readouts. Capacitive-type pressure sensors have been developed as alternatives to FSRs due to their improved durability and sensitivity, making them suitable for applications in gait analysis and motion classification for activities of daily living (ADLs). Each type of sensor offers unique advantages in terms of precision, cost-effectiveness, and ease of manufacturing, catering to different requirements in the field of AIMDs.
How is permittivity related to microwave absorption?
5 answers
Permittivity plays a crucial role in microwave absorption properties of materials. Different materials exhibit varying permittivity values, affecting their ability to absorb microwaves efficiently. For instance, the resonant perturbation method accurately measures permittivity of materials like paraffin, fused silica glass, and alumina, showing a direct correlation between permittivity and absorption capabilities. Similarly, the controlled shell thickness of core-shell composite nanospheres enhances absorption properties by influencing impedance matching, which is directly related to permittivity. Moreover, the complex permittivity of ZnO/C composite absorbents can be adjusted to optimize microwave absorption, showcasing the importance of permittivity in absorption efficiency. Additionally, incorporating recycled hematite nanoparticles in polymer composites enhances complex permittivity, improving microwave absorption capabilities. Therefore, permittivity directly influences the microwave absorption performance of materials.
What compounds have absorption maxima about 315 nm?
5 answers
Compounds with absorption maxima around 315 nm include polydiacetylenes with visible light absorption capabilities, various organic dyes like indigo, azobenzene, and phenylamine, and porphyrins and their metal complexes. Polydiacetylenes, especially those with cyanovinyl aromatic or quinoid side chain components, exhibit absorption maxima in the visible light range. Additionally, organic dyes such as indigo and azobenzene show absorption maxima around 315 nm when calculated using semiempirical molecular orbital theories like AM1, PM3, and PM5. Furthermore, porphyrins and their metal complexes also display absorption band maxima around 315 nm in nonpolar and aprotic polar solvents due to dispersive stabilization of the excited state.
What is the reason of obtained sharp emission peak at 482 nm wavelength for Nd-doped v2o5 in pL spectra?
5 answers
The sharp emission peak at 482 nm wavelength in the photoluminescence (PL) spectra of Nd-doped V2O5 can be attributed to the electronic transitions of Nd3+ ions within the material. The addition of Nd3+ ions to V2O5 alters its optical properties, leading to a significant red shift in the PL spectra compared to undoped V2O5. The presence of a large number of V4+ oxidation states in V2O5 nanospheres enhances the transition probability, resulting in intense ultraviolet (UV) PL, which could contribute to the observed sharp emission peak. Additionally, the Nd3+ ions in the glass system cause changes in the bandgap energies and localized states within the bandgap, influencing the emission characteristics and peak wavelength in the PL spectra.
Do manganese oxides oxidise to higher order oxidation states under in situ OER conditions XAS?
5 answers
Manganese oxides do undergo oxidation to higher oxidation states under in situ oxygen evolution reaction (OER) conditions as observed through X-ray absorption spectroscopy (XAS). Studies reveal that during the OER, manganese oxides exhibit reversible redox processes, transitioning between different oxidation states such as Mn3+ and Mn4+. The valence changes occur at OER-relevant voltages, with the formation of mixed Mn3+/4+ valence preceding oxygen evolution at specific potentials. Additionally, in situ XAS experiments demonstrate the transformation of manganese species within the oxide film under different potentials, highlighting the dynamic nature of manganese oxidation states during OER conditions. Overall, the research indicates that manganese oxides indeed oxidize to higher order oxidation states during OER, showcasing their redox activity and relevance in catalytic processes.
What does XANES of zirconium phosponates look like?
4 answers
X-ray Absorption Near Edge Structure (XANES) spectra of zirconium phosphonates exhibit distinct features based on their structures and coordination environments. Studies have shown that the XANES spectra of zirconium compounds like Zr2(PO4)H5(L)2·H2O display specific characteristics. The spectra provide insights into the local atomic structure and electronic states of the zirconium ions, reflecting the coordination numbers, local symmetries, and bonding characteristics. Additionally, XANES analysis of zirconium phosphonates can reveal details about the proton conductivity properties of these compounds, showcasing dependencies on factors like relative humidity and temperature. The XANES technique serves as a valuable tool for studying the structural and electronic properties of zirconium phosphonates, offering a chemically selective and detailed perspective on their atomic environments.