Log in

Relevant bibliographies by topics / Spectral stack / Journal articles

To see the other types of publications on this topic, follow the link: Spectral stack.

Journal articles on the topic 'Spectral stack'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Spectral stack.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Zhou, Wei, Haoran Li, Shiya Wen, et al. "Simulation of Soil Organic Carbon Content Based on Laboratory Spectrum in the Three-Rivers Source Region of China." Remote Sensing 14, no. 6 (2022): 1521. http://dx.doi.org/10.3390/rs14061521.

Full text

Abstract:

Soil organic carbon (SOC) changes affect the land carbon cycle and are also closely related to climate change. Visible-near infrared spectroscopy (Vis-NIRS) has proven to be an effective tool in predicting soil properties. Spectral transformations are necessary to reduce noise and ensemble learning methods can improve the estimation accuracy of SOC. Yet, it is still unclear which is the optimal ensemble learning method exploiting the results of spectral transformations to accurately simulate SOC content changes in the Three-Rivers Source Region of China. In this study, 272 soil samples were co

APA, Harvard, Vancouver, ISO, and other styles

2

Stojkovic, Suzana, Jaakko Astola, and Karen Egiazarian. "Calculation of selection probabilities of stack filters through BDD." Facta universitatis - series: Electronics and Energetics 17, no. 3 (2004): 421–42. http://dx.doi.org/10.2298/fuee0403421s.

Full text

Abstract:

This paper presents a procedure for calculation of selection probabilities of stack filters using Binary decision diagrams (BDDs) to represent the positive Boolean function that defines the stack filter. The procedure is derived by a modification of the spectral method for calculation of selection probabilities of stack filters. The usage of BDDs, instead of vectors overcomes the exponential complexity of the corresponding spectral method and extends application of the spectral method to stack filters with large windows widths.

APA, Harvard, Vancouver, ISO, and other styles

3

Poshakinskiy, Alexander V., Dmitrii R. Kazanov, Tatiana V. Shubina, and Sergey A. Tarasenko. "Optical activity in chiral stacks of 2D semiconductors." Nanophotonics 7, no. 4 (2018): 753–62. http://dx.doi.org/10.1515/nanoph-2017-0114.

Full text

Abstract:

AbstractWe show that the stacks of two-dimensional semiconductor crystals with the chiral packing exhibit optical activity and circular dichroism. We develop a microscopic theory of these phenomena in the spectral range of exciton transitions that takes into account the spin-dependent hopping of excitons between the layers in the stack and the interlayer coupling of excitons via electromagnetic field. For the stacks of realistic two-dimensional semiconductors such as transition metal dichalcogenides, we calculate the rotation and ellipticity angles of radiation transmitted through such structu

APA, Harvard, Vancouver, ISO, and other styles

4

Jones, Hugh R. A., and Mike R. S. Hawkins. "A Deep Large area Search for Low Luminosity Stars." Highlights of Astronomy 11, no. 1 (1998): 435. http://dx.doi.org/10.1017/s1539299600021675.

Full text

Abstract:

In a recent survey for faint red stars from a digital stack of Schmidt plates a number of candidate objects were identified. Parallax’s for three of these objects have been reported showing them to have luminosities which interpreted within the available evolutionary models indicate them to be good brown dwarf candidates. Here we examine spectra of these objects and others from the plate stack. Using standard spectral indices we find that for a given spectral type their spectra are more consistent with the Pleiades brown dwarfs (PPL 15, Teide 1 and Calar 3) than with standard late-type M dwarf

APA, Harvard, Vancouver, ISO, and other styles

5

Journal, Baghdad Science. "EXTENSION OF HIGH REFLECTANCE BAND WIDTH FOR FAR INFRARED SPECTRAL REGION : (1)." Baghdad Science Journal 1, no. 2 (2004): 247–52. http://dx.doi.org/10.21123/bsj.1.2.247-252.

Full text

Abstract:

Extension of bandwidth for high reflectance zone for the spectral region (8-14pm) was studied adapting the concept of contiguous and overlapping high reflectance stacks. Computations was carried out using the modified characteristic matrix theory restricted to near-normal incidence of light on dielectric , homogenous and isotropic symmetrical stack. Certain precautions must be taken in the choice of stacks to avoid deep —reflectance minima from developing within the extended high reflectance region. Results illustrate that the techniques of extending the high reflectance regions are applicable

APA, Harvard, Vancouver, ISO, and other styles

6

Bowman, Christen L., Devin S. Rand, Lorraine E. Lisiecki та Samantha C. Bova. "An 800 kyr planktonic δ¹⁸O stack for the Western Pacific Warm Pool". Earth System Science Data 16, № 1 (2024): 701–13. http://dx.doi.org/10.5194/essd-16-701-2024.

Full text

Abstract:

Abstract. The Western Pacific Warm Pool (WPWP) exhibits different glacial–interglacial climate variability compared to high latitudes, and its sea surface temperatures are thought to respond primarily to changes in greenhouse forcing. To better characterize the orbital-scale climate response covering the WPWP, we constructed a planktonic δ18O stack (average) of 10 previously published WPWP records of the last 800 kyr, available at https://doi.org/10.5281/zenodo.10211900 (Bowman et al., 2023), using the new Bayesian alignment and stacking software BIGMACS (Lee et al., 2023b). Similarities in st

APA, Harvard, Vancouver, ISO, and other styles

7

Karmakov, Y., D. Spassov, and A. Paskaleva. "Ellipsometry of very thin Al₂O₃-HfO₂ stacks for nano-memory applications." Journal of Physics: Conference Series 2710, no. 1 (2024): 012010. http://dx.doi.org/10.1088/1742-6596/2710/1/012010.

Full text

Abstract:

Abstract Nowadays, the way towards manufacturing of advanced flash memory devices with conformal layers in stacks or laminates depends on their physical characterisation, i.e. the layer and interface thicknesses, density and composition. The transition dimension between thin and very thin stacks is in the range of few nanometres. The assumption that the oxide layer properties in the very thin stacks are constant in depth or are the same as for the bulk material values is not correct. We have applied ellipsometry (Variable Angle Spectral Ellipsometry, and Multiple Angle Incident Ellipsometry) w

APA, Harvard, Vancouver, ISO, and other styles

8

Clerici, Slodkowski Katia, and Natalia Vale Asari. "Direct measures of chemical abundances from stacked spectra of star-forming galaxies: Implications for the mass–metallicity–star formation rate relation." Proceedings of the International Astronomical Union 15, S359 (2020): 424–26. http://dx.doi.org/10.1017/s174392132000188x.

Full text

Abstract:

AbstractThe stellar mass–star formation rate–metallicity relation provides clues on the chemical evolution of galaxies. We revisit this relation by measuring the gas-phase metallicity using the direct method. For metal-rich galaxies this is not straightforward, because auroral emission lines sensitive the electron temperature are lost in spectral noise. In order to increase the spectral signal-to-noise ratio and detect faint auroral lines, we stack the spectra of similar galaxies. This allows us to use the direct method to obtain consistent metallicity measurements.

APA, Harvard, Vancouver, ISO, and other styles

9

Chen, Qingxiang, Martin Meyer, Attila Popping, and Lister Staveley-Smith. "Interferometric cubelet stacking to recover H i emission from distant galaxies." Monthly Notices of the Royal Astronomical Society 502, no. 2 (2021): 2308–18. http://dx.doi.org/10.1093/mnras/stab168.

Full text

Abstract:

ABSTRACT In this paper, we introduce a method for stacking data cubelets extracted from interferometric surveys of galaxies in the redshifted 21-cm H},i line. Unlike the traditional spectral stacking technique, which stacks one-dimensional spectra extracted from data cubes, we examine a method based on image domain stacks that makes deconvolution possible. To test the validity of this assumption, we mock a sample of 3622 equatorial galaxies extracted from the GAMA survey, recently imaged as part of a DINGO-VLA project. We first examine the accuracy of the method using a noise-free simulation a

APA, Harvard, Vancouver, ISO, and other styles

10

Jolly, Jean-Baptiste, Kirsten K. Knudsen, and Flora Stanley. "linestacker: a spectral line stacking tool for interferometric data." Monthly Notices of the Royal Astronomical Society 499, no. 3 (2020): 3992–4010. http://dx.doi.org/10.1093/mnras/staa2908.

Full text

Abstract:

ABSTRACT linestacker is a new open access and open source tool for stacking of spectral lines in interferometric data. linestacker is an ensemble of casa tasks, and can stack both 3D cubes or already extracted spectra. The algorithm is tested on increasingly complex simulated data sets, mimicking Atacama Large Millimeter/submillimeter Array, and Karl G. Jansky Very Large Array observations of [C ii] and CO(3–2) emission lines, from z ∼ 7 and z ∼ 4 galaxies, respectively. We find that the algorithm is very robust, successfully retrieving the input parameters of the stacked lines in all cases wi

APA, Harvard, Vancouver, ISO, and other styles

11

JAYA, V., G. R. DODAGOUDAR, and A. BOOMINATHAN. "SEISMIC SOIL–FOUNDATION–STRUCTURE INTERACTION ANALYSIS OF DEEPLY EMBEDDED VENTILATION STACK." Journal of Earthquake and Tsunami 06, no. 01 (2012): 1250003. http://dx.doi.org/10.1142/s1793431112500030.

Full text

Abstract:

In this paper, the seismic response analysis of deeply embedded ventilation stack is addressed by considering the effects of soil–foundation–structure interaction (SFSI). Seismic SFSI analysis of the stack subjected to a site-specific design ground motion is carried out using finite element method. A parametric sensitivity analysis is made to investigate the effect of embedment and shear wave velocity ratio of the subsurface profile on the seismic response of the stack. The first series of the SFSI analysis is carried out for the stack with surface footing using computer program SASSI 2000. Th

APA, Harvard, Vancouver, ISO, and other styles

12

Slipchenko, S. O., A. A. Podoskin, D. A. Veselov та ін. "Vertical stacks of pulsed (100 ns) mesa-stripe semiconductor lasers with an ultra-wide (800 μm) aperture emitting kilowatt-level peak power at a wavelength of 1060 nm". Quantum Electronics 52, № 2 (2022): 171–73. http://dx.doi.org/10.1070/qel17985.

Full text

Abstract:

Abstract A pulsed source of radiation in the spectral region of 1060 nm with a kilowatt level peak output power is developed based on a vertical stack of microbars of stripe semiconductor lasers with an ultra-wide (800 μm) aperture. The laser stack contains three microbars with three emitters each, which ensures an emitting area of 2.6 × 0.4 mm. The highest radiative efficiency of the stack is 2.48 W A−1. The maximum achieved peak power reached 1400 W under pumping by current pulses with an amplitude of 650 A and a duration of 100 ns and is limited by the current source capacity.

APA, Harvard, Vancouver, ISO, and other styles

13

LIN, G., I. F. CHEN, F. J. LAY та ін. "HIGH-PERFORMANCE RIDGE-WAVEGUIDE MULTI-STACK (N=2, 5 AND 10)InAs/InGaAs/GaAs QUANTUM DOT LASERS of 1.3 μm RANGE". International Journal of Nanoscience 03, № 01n02 (2004): 187–92. http://dx.doi.org/10.1142/s0219581x04001973.

Full text

Abstract:

We have investigated light-current and spectral characteristics of 2-, 5- and 10-stack InAs / InGaAs / GaAs quantum dot (QD) ridge-waveguide lasers grown by MBE. Ultra-low threshold current of 1.43 mA was achieved for 2-stack QD laser. Simultaneous lasing at ground- and excited-states was observed. This effect is accounted for the finite time of carriers capture to the ground-state in QDs. Multi-stack QD structures enables to maintain continuous-wave (CW) ground-state lasing up to the current density of 100×Jth and to achieve the highest output power and efficiency ever recorded for any single

APA, Harvard, Vancouver, ISO, and other styles

14

Stanley, F., J. B. Jolly, S. König, and K. K. Knudsen. "A spectral stacking analysis to search for faint outflow signatures in z ∼ 6 quasars." Astronomy & Astrophysics 631 (October 23, 2019): A78. http://dx.doi.org/10.1051/0004-6361/201834530.

Full text

Abstract:

Aims. Outflows in quasars during the early epochs of galaxy evolution are an important part of the feedback mechanisms that potentially affect the evolution of the host galaxy. However, systematic millimetre (mm) observations of outflows are only now becoming possible with the advent of sensitive mm telescopes. In this study we used spectral stacking methods to search for a faint high-velocity outflow signal in a sample of [C II] detected, z ∼ 6 quasars. Methods. We searched for broad emission line signatures from high-velocity outflows for a sample of 26 z ∼ 6 quasars observed with the Atacam

APA, Harvard, Vancouver, ISO, and other styles

15

Ng, Russell, and Joonhyeong Park. "Inquiring into a spectral concept in the physics classroom." Physics Education 59, no. 6 (2024): 063003. http://dx.doi.org/10.1088/1361-6552/ad744f.

Full text

Abstract:

Abstract We designed an inquiry activity to investigate the question ‘How transparent are transparent films and papers?’ Using an easily-replicable set up, we observed the effect of increasing the number of transparent films, thin papers and general papers between a light source and a light sensor. For each material, one sheet was added each time. The amount of light received was collected and graphed by a data logger. Our findings show that, as the number of sheets increases, the amount of light received at the receiver decreases. The general paper and thin paper stacks took 4 sheets and 10 s

APA, Harvard, Vancouver, ISO, and other styles

16

Groza, Andreea, Mihai Serbanescu, Bogdan Butoi, et al. "Advances in Spectral Distribution Assessment of Laser Accelerated Protons using Multilayer CR-39 Detectors." Applied Sciences 9, no. 10 (2019): 2052. http://dx.doi.org/10.3390/app9102052.

Full text

Abstract:

We show that a spectral distribution of laser-accelerated protons can be extracted by analyzing the proton track diameters observed on the front side of a second CR-39 detector arranged in a stack. The correspondence between the proton track diameter and the incident energy on the second detector is established by knowing that protons with energies only higher than 10.5 MeV can fully deposit their energy in the second CR-39 detector. The correlation between the laser-accelerated proton track diameters observed on the front side of the second CR-39 detector and the proton incident energy on the

APA, Harvard, Vancouver, ISO, and other styles

17

Burlak, Gennadiy N., and A. Diaz-de-Anda. "The Subwavelength Optical Field Confinement in a Multilayered Microsphere with Quasiperiodic Spherical Stack." Advances in OptoElectronics 2008 (April 10, 2008): 1–6. http://dx.doi.org/10.1155/2008/781524.

Full text

Abstract:

We study the frequency spectrum of nanoemitters placed in a microsphere with a quasiperiodic subwavelength spherical stack. The spectral evolution of transmittancy at the change of thickness of two-layer blocks, constructed following the Fibonacci sequence, is investigated. When the number of layers (Fibonacci order) increases, the structure of spectrum acquires a fractal form. Our calculations show the radiation confinement and gigantic field enhancement, when the ratio of layers’ widths in twolayer blocks of the stack is close to the golden mean value.

APA, Harvard, Vancouver, ISO, and other styles

18

Anaya, Miguel, Andrea Rubino, Mauricio E. Calvo, and Hernán Míguez. "Solution processed high refractive index contrast distributed Bragg reflectors." Journal of Materials Chemistry C 4, no. 20 (2016): 4532–37. http://dx.doi.org/10.1039/c6tc00663a.

Full text

Abstract:

We have developed a method to alternate porous and dense dielectric films in order to build high refractive index contrast distributed Bragg reflectors (DBRs) capable of reflecting very efficiently in a targeted spectral range employing a small number of layers in the stack.

APA, Harvard, Vancouver, ISO, and other styles

19

Akhsakhalyan A. A., Garakhin S. A., Dar'in F. A., et al. "Manufacturing and research of mirrors with a wide bandwidth for synchrotron applications." Technical Physics 92, no. 13 (2022): 2085. http://dx.doi.org/10.21883/tp.2022.13.52227.128-21.

Full text

Abstract:

The work is devoted to the development, fabrication and analysis of broadband W / Si multilayer mirrors for a broadband monochromator, calculated for the spectral range of 7-10 keV. The possibility of using the stacking approach to obtain multilayer mirrors with a reflection coefficient of about 30% and a spectral bandwidth Delta E/E of about 20% is shown. The results of measurements of the angular and spectral reflection curves of the mirror obtained on a laboratory diffractometer and on a synchrotron in Novosibirsk are presented. Keywords: hard X-ray range, monochromator, synchrotron radiati

APA, Harvard, Vancouver, ISO, and other styles

20

Li, Bo, Xiaotao Wen, Wenliang Nie, Ziyu Qin, and Yilong He. "Pre-stack Q estimation based on inverse spectral decomposition." Journal of Petroleum Science and Engineering 205 (October 2021): 108775. http://dx.doi.org/10.1016/j.petrol.2021.108775.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Białek, Ewelina, Weronika Gruszczyńska, Maksymilian Włodarski, Malwina Liszewska, and Małgorzata Norek. "Fabrication of Mid-Infrared Porous Anodic Alumina Optical Microcavities via Aluminum Anodization." Materials 17, no. 22 (2024): 5620. http://dx.doi.org/10.3390/ma17225620.

Full text

Abstract:

This study reports the production of mid-infrared (MIR) porous anodic alumina (PAA)-based microcavities with tunable optical quality. The spectral position of the cavity resonance peak (λC), along with its intensity (IR) and Q-factor, varies depending on the geometric positioning of the cavity layer within the multilayer stack of alternating low- and high-porosity layers, as well as the type of cavity produced—either by high voltage (CvH-type) or low voltage (CvL-type) pulses. In most cases, PAA microcavities with CvH-type cavity layers exhibited superior light confinement properties compared

APA, Harvard, Vancouver, ISO, and other styles

22

Durnez, Clémentine, Cédric Virmontois, Pierre Panuel, et al. "Evaluation of Microlenses, Color Filters, and Polarizing Filters in CIS for Space Applications." Sensors 23, no. 13 (2023): 5884. http://dx.doi.org/10.3390/s23135884.

Full text

Abstract:

For the last two decades, the CNES optoelectronics detection department and partners have evaluated space environment effects on a large panel of CMOS image sensors (CIS) from a wide range of commercial foundries and device providers. Many environmental tests have been realized in order to provide insights into detection chain degradation in modern CIS for space applications. CIS technology has drastically improved in the last decade, reaching very high performances in terms of quantum efficiency (QE) and spectral selectivity. These improvements are obtained thanks to the introduction of vario

APA, Harvard, Vancouver, ISO, and other styles

23

Lorenz, Brian, Mariska Kriek, Alice E. Shapley, et al. "Stacking and Analyzing MOSDEF Galaxies by Spectral Types: Implications for Dust Geometry and Galaxy Evolution." Astrophysical Journal 975, no. 2 (2024): 187. http://dx.doi.org/10.3847/1538-4357/ad7de8.

Full text

Abstract:

Abstract We examine star formation and dust properties for a sample of 660 galaxies at 1.37 ≤ z ≤ 2.61 in the MOSDEF survey by dividing them into groups with similarly shaped spectral energy distributions (SEDs). For each group, we combine the galaxy photometry into a finely sampled composite SED, and stack their spectra. This method enables the study of more complete galaxy samples, including galaxies with very faint emission lines. We fit these composite SEDs with Prospector to measure the stellar attenuation and SED-based star formation rates (SFRs). We also derive emission-line properties

APA, Harvard, Vancouver, ISO, and other styles

24

Vargas, Carlos J., Hannah Bish, Viviana Acquaviva та ін. "TO STACK OR NOT TO STACK: SPECTRAL ENERGY DISTRIBUTION PROPERTIES OF Lyα-EMITTING GALAXIES ATz= 2.1". Astrophysical Journal 783, № 1 (2014): 26. http://dx.doi.org/10.1088/0004-637x/783/1/26.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Granja, C., J. Jakubek, P. Soukup, et al. "Spectral tracking of energetic charged particles in wide field-of-view with miniaturized telescope MiniPIX Timepix3 1 × 2 stack." Journal of Instrumentation 17, no. 03 (2022): C03028. http://dx.doi.org/10.1088/1748-0221/17/03/c03028.

Full text

Abstract:

Abstract A highly integrated particle telescope is assembled from two MiniPIX Timepix3 detectors in stack configuration to provide time- and spectral-sensitive tracking of energetic charged particles. The telescope architecture, high granularity and per-pixel spectral response of the imaging detectors enable directional mapping of energetic charged particles in wide field-of-view (FoV) with high angular resolution (sub degree) without the need for collimators. The pixel detectors are operated in sync and readout each with separate USB 2.0 cable for integrated control and power supply. Timepix3

APA, Harvard, Vancouver, ISO, and other styles

26

Yan, Z., and Z. Wu. "STACKED LOCAL FEATURE DETECTOR FOR HYPERSPECTRAL IMAGE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2020 (August 21, 2020): 495–500. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2020-495-2020.

Full text

Abstract:

Abstract. Images registration is an important task in hyperspectral image processing, while almost all local feature point based image matching algorithm is designed for single band image only and miss the advantage of abundant spectral information. Therefor, in this paper we propose a novel local feature detector for hyperspectral image. This method, which is named stacked local feature detector (HSI-SFD), stack all local feature points detected from every single spectral band. With redundant information, local feature miss-detected at noise pixel can be filtered out by the stack count thresh

APA, Harvard, Vancouver, ISO, and other styles

27

Jordan, T. M., J. C. Partridge, and N. W. Roberts. "Disordered animal multilayer reflectors and the localization of light." Journal of The Royal Society Interface 11, no. 101 (2014): 20140948. http://dx.doi.org/10.1098/rsif.2014.0948.

Full text

Abstract:

Multilayer optical reflectors constructed from ‘stacks’ of alternating layers of high and low refractive index dielectric materials are present in many animals. For example, stacks of guanine crystals with cytoplasm gaps occur within the skin and scales of fish, and stacks of protein platelets with cytoplasm gaps occur within the iridophores of cephalopods. Common to all these animal multilayer reflectors are different degrees of random variation in the thicknesses of the individual layers in the stack, ranging from highly periodic structures to strongly disordered systems. However, previous d

APA, Harvard, Vancouver, ISO, and other styles

28

Lee, Sanggyun, Hyun-cheol Kim, and Jungho Im. "Arctic lead detection using a waveform mixture algorithm from CryoSat-2 data." Cryosphere 12, no. 5 (2018): 1665–79. http://dx.doi.org/10.5194/tc-12-1665-2018.

Full text

Abstract:

Abstract. We propose a waveform mixture algorithm to detect leads from CryoSat-2 data, which is novel and different from the existing threshold-based lead detection methods. The waveform mixture algorithm adopts the concept of spectral mixture analysis, which is widely used in the field of hyperspectral image analysis. This lead detection method was evaluated with high-resolution (250 m) MODIS images and showed comparable and promising performance in detecting leads when compared to the previous methods. The robustness of the proposed approach also lies in the fact that it does not require the

APA, Harvard, Vancouver, ISO, and other styles

29

Ben-Zvi, David, David Nadler, and Anatoly Preygel. "A spectral incarnation of affine character sheaves." Compositio Mathematica 153, no. 9 (2017): 1908–44. http://dx.doi.org/10.1112/s0010437x17007278.

Full text

Abstract:

We present a Langlands dual realization of the putative category of affine character sheaves. Namely, we calculate the categorical center and trace (also known as the Drinfeld center and trace, or categorical Hochschild cohomology and homology) of the affine Hecke category starting from its spectral presentation. The resulting categories comprise coherent sheaves on the commuting stack of local systems on the two-torus satisfying prescribed support conditions, in particular singular support conditions, which appear in recent advances in the geometric Langlands program. The key technical tools

APA, Harvard, Vancouver, ISO, and other styles

30

Rhee, Y. J., S. M. Nam, J. Peebles, et al. "Spectral tomographic analysis of Bremsstrahlung X-rays generated in a laser-produced plasma." Laser and Particle Beams 34, no. 4 (2016): 645–54. http://dx.doi.org/10.1017/s0263034616000604.

Full text

Abstract:

AbstractA new approach is proposed to analyze Bremsstrahlung X-rays that are emitted from laser-produced plasmas (LPP) and are measured by a stack type spectrometer. This new method is based on a spectral tomographic reconstruction concept with the variational principle for optimization, without referring to the electron energy distribution of a plasma. This approach is applied to the analysis of some experimental data obtained at a few major laser facilities to demonstrate the applicability of the method. Slope temperatures of X-rays from LPP are determined with a two-temperature model, showi

APA, Harvard, Vancouver, ISO, and other styles

31

Jackson, M. C., R. D. Long, D. Lee, and N. J. Freeman. "Development of X-ray streak camera electronics at AWRE." Laser and Particle Beams 4, no. 1 (1986): 145–56. http://dx.doi.org/10.1017/s0263034600001695.

Full text

Abstract:

The paper reviews a number of X-ray streak cameras developed at AWRE. These cameras are used to provide temporal and one-dimensional spatial or spectral information on X-rays emitted from laser produced plasmas. Two of these cameras have been designed to be combined with other diagnostic instrumentation; one with a Wolter X-ray microscope (×22 magnification) and the other with a Bragg diffraction crystal spectrometer. This latter instrument provides a few eV spectral resolution and ∼15 ps temporal resolution; a typical experimental application at the AWRE HELEN laser facility will be described

APA, Harvard, Vancouver, ISO, and other styles

32

Aboneh, Tagel, Abebe Rorissa, and Ramasamy Srinivasagan. "Stacking-Based Ensemble Learning Method for Multi-Spectral Image Classification." Technologies 10, no. 1 (2022): 17. http://dx.doi.org/10.3390/technologies10010017.

Full text

Abstract:

Higher dimensionality, Hughes phenomenon, spatial resolution of image data, and presence of mixed pixels are the main challenges in a multi-spectral image classification process. Most of the classical machine learning algorithms suffer from scoring optimal classification performance over multi-spectral image data. In this study, we propose stack-based ensemble-based learning approach to optimize image classification performance. In addition, we integrate the proposed ensemble learning with XGBoost method to further improve its classification accuracy. To conduct the experiment, the Landsat ima

APA, Harvard, Vancouver, ISO, and other styles

33

Bachmann, D., M. Rösch, C. Deutsch, et al. "Spectral gain profile of a multi-stack terahertz quantum cascade laser." Applied Physics Letters 105, no. 18 (2014): 181118. http://dx.doi.org/10.1063/1.4901316.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Cao, Jian, Binbin Jiang, Hongfei Jiao, et al. "A Dichroic Beamsplitter for the Laser Protection of Infrared Detectors." Coatings 12, no. 12 (2022): 1861. http://dx.doi.org/10.3390/coatings12121861.

Full text

Abstract:

The design and fabrication approach of a dichroic beamsplitter to meet the protection requirements of infrared detectors for blinding laser weapons is presented. The dichroic beamsplitter must protect against 1064 and 532 nm lasers and have high transmittance in the detection beam band of 3.6–4.7 µm. In order to realize the protection and antireflection (AR) functions of the dichroic beamsplitter, Ta2O5, which has a wide band gap and high thermodynamic stability, was selected as the high-refractive-index material. A multilayer stack was deposited on a silicon substrate by ion-assisted electron

APA, Harvard, Vancouver, ISO, and other styles

35

Spasova, Stanka, Vladimir Dulev, Alexander Benkovsky, et al. "Deposition and Characterization of Zinc–Tin Oxide Thin Films with Varying Material Compositions." Coatings 15, no. 2 (2025): 225. https://doi.org/10.3390/coatings15020225.

Full text

Abstract:

Zinc–tin oxide (ZTO) thin films (ZnO)x(SnO2)1−x with different material composition x (0 < x < 1) are deposited by spin coating on glass substrates at room temperature. The Differential Scanning Calorimetry (DSC) data of the precursor compounds show gradual phase transitions up to 480 °C. These data are used for an appropriate regime for thermal annealing of the layers. X-ray photoelectron spectroscopy (XPS) data show mixed oxide compound formation in states Zn2+, Sn4+ and O2- of the constituents. Optical investigation manifests high transmittance above 80% in the visible spectral range

APA, Harvard, Vancouver, ISO, and other styles

36

Pavlichenko, Ida, Armin T. Exner, Gennady Logvenov, Giuseppe Scarpa, Paolo Lugli, and Bettina V. Lotsch. "Nanomorphology tuning of the thermal response of TiO2/SiO2 Bragg stacks." Canadian Journal of Chemistry 90, no. 12 (2012): 1069–77. http://dx.doi.org/10.1139/v2012-081.

Full text

Abstract:

Herein, we present a comparative study of thermo- and environmentally responsive TiO2/SiO2 one-dimensional photonic crystals (Bragg stacks) fabricated by different deposition methods and fabrication schemes, featuring various multilayer nanomorphologies. These include dense multilayer systems processed by physical vapor deposition and wet-chemistry protocols, as well as porous systems, namely, nanoparticle-based optical filters exhibiting textural porosity, and evaporation-induced self-assembled mesoporous Bragg stacks exhibiting predominantly structural porosity, as well as hybrid structures

APA, Harvard, Vancouver, ISO, and other styles

37

Journal, Baghdad Science. "design of multiband reflectors adapting the concept of stack." Baghdad Science Journal 2, no. 2 (2005): 253–59. http://dx.doi.org/10.21123/bsj.2.2.253-259.

Full text

Abstract:

Designed Mirrors double and triple package adoption concept heap where they were changing the thickness of the layers within periodic basis of the pile and different ratios (p: q) in addition to change the refractive index of materials within periodic basis and its impact on sites Dhour tops high reflectivity study included spectral region visible and infrared, depending on NdharahFeatured matrix adjusted fall of light close to the vertical arrangement multilayer dielectric materials and thin films homogeneous and uniform

APA, Harvard, Vancouver, ISO, and other styles

38

Ghazi R, Hayfa. "design of multiband reflectors adapting the concept of stack." Baghdad Science Journal 2, no. 2 (2005): 253–59. http://dx.doi.org/10.21123/bsj.2005.609.

Full text

Abstract:

Designed Mirrors double and triple package adoption concept heap where they were changing the thickness of the layers within periodic basis of the pile and different ratios (p: q) in addition to change the refractive index of materials within periodic basis and its impact on sites Dhour tops high reflectivity study included spectral region visible and infrared, depending on NdharahFeatured matrix adjusted fall of light close to the vertical arrangement multilayer dielectric materials and thin films homogeneous and uniform

APA, Harvard, Vancouver, ISO, and other styles

39

Gibson, Bruce S., and Alan R. Levander. "Apparent layering in common‐midpoint stacked images of two‐dimensionally heterogeneous targets." GEOPHYSICS 55, no. 11 (1990): 1466–77. http://dx.doi.org/10.1190/1.1442794.

Full text

Abstract:

Model studies with finite‐difference synthetic data demonstrate a fundamental spatial bias in the appearance of common‐midpoint (CMP) stacked images. The CMP stack of data recorded over a target having 2-D random variations in velocity shows numerous short reflection segments; similar reflection patterns in field data are often interpreted in terms of 1-D fine‐scale layering. The stacked image appears layered because of enhanced lateral continuity attributable to the well‐known dip filter of the stacking process. The stack filter can be characterized using the formulation of Bolondi et al. (19

APA, Harvard, Vancouver, ISO, and other styles

40

Montecchi, Marco, Alberto Mittiga, Claudia Malerba, and Francesca Menchini. "KSEMAW: an open source software for the analysis ofspectrophotometric, ellipsometric andphotothermal deflection spectroscopy measurements." Open Research Europe 1 (August 18, 2021): 95. http://dx.doi.org/10.12688/openreseurope.13842.1.

Full text

Abstract:

The optical behavior of devices based on thin films is determined by complex refractive index and thickness of each slab composing the stack; these important parameters are usually evaluated from photometric and/or ellipsometric spectral measurements, given a model of the stack, by means of dedicated software. In the case of complex multilayer devices, generally a number of simpler specimens (like single-film on substrate) must be preliminarily characterized. This paper introduces the reader to a new open source software for thin film characterization finally released after about 30 years of d

APA, Harvard, Vancouver, ISO, and other styles

41

Sabah Jaber, Hussein, and . "Classification of Hyperspectral Remote Sensing for Production Minerals Mapping Using Geological Map and Geomatics Techniques." International Journal of Engineering & Technology 7, no. 4.20 (2018): 480. http://dx.doi.org/10.14419/ijet.v7i4.20.26247.

Full text

Abstract:

The classification of hyperspectral images is an interesting job since the data dimension is huge for conventional classification procedures; normally several hundreds of spectral bands are attained for each image. These spectral bands can supported very rich spectral data of each pixel to find objects material .The objective of this research is to classify hyperspectral images for detection and production of detailed minerals mapping using geological map and Environment for Visualizing Images (ENVI) software. In this research, ASTER data and geological map have been used. Some techniques on t

APA, Harvard, Vancouver, ISO, and other styles

42

Palanchoke, Ujwol, Salim Boutami, Stéphane Pocas, Névine Rochat, Valérie Goudon, and Wilfried Rabaud. "Influence of dimensional variation of metal-insulator-metal stack in spectral response." Optical Materials Express 8, no. 9 (2018): 2494. http://dx.doi.org/10.1364/ome.8.002494.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Ohtsu, Masayasu, and Takeshi Watanabe. "Stack imaging of spectral amplitudes based on impact-echo for flaw detection." NDT & E International 35, no. 3 (2002): 189–96. http://dx.doi.org/10.1016/s0963-8695(01)00045-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Rahimi, Eesa, and Kürşat Şendur. "Thermally controlled femtosecond pulse shaping using metasurface based optical filters." Nanophotonics 7, no. 3 (2018): 659–68. http://dx.doi.org/10.1515/nanoph-2017-0089.

Full text

Abstract:

AbstractShaping of the temporal distribution of the ultrashort pulses, compensation of pulse deformations due to phase shift in transmission and amplification are of interest in various optical applications. To address these problems, in this study, we have demonstrated an ultra-thin reconfigurable localized surface plasmon (LSP) band-stop optical filter driven by insulator-metal phase transition of vanadium dioxide. A Joule heating mechanism is proposed to control the thermal phase transition of the material. The resulting permittivity variation of vanadium dioxide tailors spectral response o

APA, Harvard, Vancouver, ISO, and other styles

45

Montecchi, Marco, Alberto Mittiga, Claudia Malerba, and Francesca Menchini. "KSEMAW: an open source software for the analysis of spectrophotometric, ellipsometric and photothermal deflection spectroscopy measurements." Open Research Europe 1 (January 4, 2023): 95. http://dx.doi.org/10.12688/openreseurope.13842.2.

Full text

Abstract:

The optical behavior of devices based on thin films is determined by complex refractive index and thickness of each slab composing the stack; these important parameters are usually evaluated from photometric and/or ellipsometric spectral measurements, given a model of the stack, by means of dedicated software. In the case of complex multilayer devices, generally a number of simpler specimens (like single-film on substrate) must be preliminarily characterized. This paper introduces the reader to a new open source software for thin film characterization finally released after about 30 years of d

APA, Harvard, Vancouver, ISO, and other styles

46

Colaninno, N., A. Marambio, and J. Roca. "TESTING A COMBINED MULTISPECTRAL-MULTITEMPORAL APPROACH FOR GETTING CLOUDLESS IMAGERY FOR SENTINEL-2." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences V-3-2020 (August 3, 2020): 293–300. http://dx.doi.org/10.5194/isprs-annals-v-3-2020-293-2020.

Full text

Abstract:

Abstract. Earth observation and land cover monitoring are among major applications for satellite data. However, the use of primary satellite information is often limited by clouds, cloud shadows, and haze, which generally contaminate optical imagery. For purposes of hazard assessment, for instance, such as flooding, drought, or seismic events, the availability of uncontaminated optical data is required. Different approaches exist for masking and replacing cloud/haze related contamination. However, most common algorithms take advantage by employing thermal data. Hence, we tested an algorithm su

APA, Harvard, Vancouver, ISO, and other styles

47

Gunning, Merrie-Ellen, Scott Wilkinson, Pei-Fei Chau, Cameron Mitchell, and Jennifer Badry. "Post-stack 3D merging to fast-track regional interpretation – offshore Otway Basin case study." Australian Energy Producers Journal 64, no. 2 (2024): S388—S392. http://dx.doi.org/10.1071/ep23189.

Full text

Abstract:

Ideally when combining legacy 3D seismic surveys, differences in acquisition parameters warrant full pre-stack reprocessing from field data. However, there are occasions where this is not possible due to time, financial or data access constraints; a valuable alternative is post-stack merging and enhancement of existing migrations. This case was to produce a regularised and seamless 3D dataset of the highest possible quality, for the offshore Otway Basin, within 2 months. The input migrated volumes varied by data extent, migration methodology, angle range and grid orientation. Fourteen input vo

APA, Harvard, Vancouver, ISO, and other styles

48

Myers, D. J., C. M. Schweik, R. Wicks, F. Bowlick, and M. Carullo. "DEVELOPING A LAND COVER CLASSIFICATION OF SALT MARSHES USING UAS TIME-SERIES IMAGERY AND AN OPEN SOURCE WORKFLOW." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-4/W8 (July 11, 2018): 155–62. http://dx.doi.org/10.5194/isprs-archives-xlii-4-w8-155-2018.

Full text

Abstract:

<p><strong>Abstract.</strong> Salt marsh ecology classification is difficult using traditional coarse resolution remote sensing techniques. Salt marshes exhibit a spatial pattern of vegetation zonation that are visually identifiable using imagery that has an improved 0.04 meter per pixel resolution. This project applies high resolution unmanned aerial system (UAS) imagery to aid in multi-temporal classification of our study area (Horseneck Beach) in Westport, Massachusetts, USA. We flew a DJI Phantom Pro 3 at low- and high-tide to capture effects the changing tide has on vege

APA, Harvard, Vancouver, ISO, and other styles

49

Qiu, Yikun, Changdong Zhou, Siha A, and Guangwei Zhang. "A spectral-acceleration-based combination-type earthquake intensity measure for high-rise stack-like structures." Advances in Structural Engineering 23, no. 7 (2019): 1350–66. http://dx.doi.org/10.1177/1369433219894237.

Full text

Abstract:

Ground motion intensity measures are of great importance for the seismic design of structures. A well-chosen intensity measure will reduce the detailed ground motion record selection effort for the nonlinear dynamic structural analyses. In this article, a spectral-acceleration-based combination-type earthquake intensity measure is presented. This intensity measure considers the higher modes effect and period elongation effect due to nonlinear deformation at the same time. The modal mass participation factors are determined to take weighting coefficients and the product of elastic first-mode pe

APA, Harvard, Vancouver, ISO, and other styles

50

Davis, Dustin, Karl Gebhardt, Erin Mentuch Cooper, et al. "HETDEX Public Source Catalog 1—Stacking 50,000 Lyman Alpha Emitters ^∗." Astrophysical Journal 954, no. 2 (2023): 209. http://dx.doi.org/10.3847/1538-4357/ace4c2.

Full text

Abstract:

Abstract We describe the ensemble properties of the 1.9 < z < 3.5 Lyman alpha emitters (LAEs) found in the HETDEX survey’s first public data release, HETDEX Public Source Catalog 1. Stacking the low-resolution (R ∼ 800) spectra greatly increases the signal-to-noise ratio (S/N), revealing spectral features otherwise hidden by noise, and we show that the stacked spectrum is representative of an average member of the set. The flux-limited, Lyα S/N restricted stack of 50,000 HETDEX LAEs shows the ensemble biweight average z ∼ 2.6 LAE to be a blue (UV continuum slope ∼ −2.4 and E(B – V) <

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!