Abstract A database (TAMUdust2020) of the optical properties irregular aerosol particles is developed for applications to radiative transfer simulations involving aerosols, particularly dust and volcanic ash particles. The particle shape model assumes an ensemble hexahedral geometries mimic complex shapes in nature. State-of-the-art light scattering computational capabilities are employed compute single-scattering these wide ranges values size parameter, index refraction, degree sphericity....

We summarize the size parameter range of applicability four light-scattering computational methods for nonspherical dielectric particles. These include two exact - extended boundary condition method (EBCM) and invariant imbedding T-matrix (II-TM) approximate approaches physical-geometric optics (PGOM) improved geometric (IGOM). For spheroids, single-scattering properties computed by EBCM II-TM agree parameters up to 150, comparison gives us confidence in using IITM as a benchmark 150 other...

Abstract. The role of mineral dust aerosol in the global radiative energy budget is often quantified by direct effect (DRE). DRE strongly depends on optical depth (DAOD), therefore, efficiency (DREE = / DAOD) widely compared across different studies to eliminate differences due various loads. Nevertheless, DREE still influenced uncertainties associated with particle size distribution (PSD) and properties. In this study, we derive a clear-sky size-resolved dataset both shortwave (SW) longwave...

An invariant imbedding T-matrix (II-TM) method is used to calculate the single-scattering properties of 8-column aggregate ice crystals.The II-TM based backscatter values are compared with those calculated by improved geometric-optics (IGOM) refine backscattering cloud radiative model in MODIS Collection 6 optical property product.The integrated attenuated backscatter-tocloud depth (IAB-ICOD) relation derived from simulations using a CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder...

Abstract. The lidar backscattering properties of Asian dust particles, namely the ratio (𝑆) and depolarization (δ), were studied using a discrete dipole approximation (DDA) model. three-dimensional morphology particles was reconstructed in fine detail focused ion-beam (FIB) tomography technique. An index based on symmetry scattering phase matrix developed to assess convergence random orientation computation DDA. Both 𝑆 δ exhibit an asymptotic trend with particle size: initially decreases...

A functionalized ethylene-vinyl-alcohol (EVOH) nanofibrous membrane (NFM) was fabricated via co-electrospinning H4SiW12O40 (SiW12) and EVOH first, then grafting citric acid (CCA) on the electrospun SiW12@EVOH NFM. Characterization with FT-IR, EDX, XPS confirmed that CCA introduced to surface of NFM Keggin structure SiW12 maintained well in composite fibers. Due a number carboxyl groups by CCA, as-prepared SiW12@EVOH-CCA can form high hydrogen bonds CR, thus be used selectively absorb congo...

Abstract It has been known for decades that carbon dioxide (CO 2 ) ice clouds exist in the Martian atmosphere. According to remote sensing observations and previous modeling studies, CO crystals may be sufficiently large generate halos. However, of crystal halos have not reported so far. This study simulates scattering polarized phase functions at a wavelength 0.48 μm based on state‐of‐the‐art light‐scattering computational capabilities. The specific habits considered simulations include...

Accurate distance determination to astrophysical objects is essential for the understanding of their intrinsic brightness and size. The SN 1987A has been previously measured by expanding photosphere method, using angular size circumstellar rings with absolute sizes derived from light curves narrow UV emission lines, reported distances ranging 46.77 kpc 55 kpc. In this study, we independently determined photometry imaging polarimetry observations AT 2019xis, a echo 1987A, adopting radiative...

Abstract. Climate models are essential for our comprehensive understanding of Earth's atmosphere and can provide critical insights on future changes decades ahead. Because these roles, today's climate continuously being developed evaluated using constraining observations measurements obtained by satellites, airborne, ground-based instruments. Instrument simulators a bridge between the measured or retrieved quantities their sampling in field while considering instrument sensitivity...

Light scattering by kaolinite dust samples at 532 nm is studied using a newly developed laboratory apparatus. During the experiments, are suspended in water, aerosolized nebulizer, and then injected into zone, with or without going through diffusion drier, to generate either dried particles water droplets inclusions. The light source dual wavelength (532 1064 nm) diode-pumped solid state laser. scattered an ensemble of collected charge-coupled device (CCD) camera, which mounted on rotating...

There has been a long-term endeavor in the light-scattering research community to develop Lorenz-Mie theory-type method for simulating light scattering by spheroidal particles with small-to-large sizes. A spheroid is very important nonspherical shape modeling optical properties of many natural particles. For first time, we computationally feasible separation variables (SVM) coordinates compute spheroids sizes compared wavelength incident (λ). The applicable size parameters (2π/λ times major...

We use a Monte Carlo radiative transfer model (MCRTM) to simulate the UBVRI light curves, images and linear polarization of echo from supernova SN$~$1987A in Large Magellanic Cloud (LMC) using various dust cloud shapes, sizes, optical properties. compare theoretical simulations observations AT2019xis, detected at large angular distance (4.05$^{'}$) SN$~$1987A. estimate size thickness based on simulation results Optical Gravitational Lensing Experiment (OGLE-IV) Transient Detection System...

The properties of a pencil light as defined approximately in the geometric optics ray tracing method are investigated. vector Kirchhoff integral is utilized to accurately compute electromagnetic near field and around with various beam base sizes, shapes, propagation directions medium refractive indices. If has mean cross section size order p times wavelength, it can propagate independently distance p2 where most energy diffuses out region. This consistent statement that van de Hulst made...

Both the computational costs and accuracy of invariant-imbedding T-matrix method escalate with increasing truncation number N at which expansions electromagnetic fields in terms vector spherical harmonics are truncated. Thus, it becomes important calculation single-scattering optical properties to choose just large enough satisfy an appropriate convergence criterion; this we call optimal number. We present a new criterion that is based on scattering phase function rather than cross section....

Abstract The satellite observational data assimilation community requires consistent hydrometer descriptions—including mass–size relation and particle size distribution—to be used in both the forecast model observation operator. We develop a microphysics-scheme-consistent snow graupel single-scattering property database to meet this requirement. In database, snowflakes are modeled as mixture of small column large aggregated ice particles, mixing ratios which may adjusted satisfy given...

The authors examine the feasibility of building cache coherent shared memory multiprocessor systems on hypercube. Various schemes are investigated and compared with each other. considered based coherence algorithms for distributed protocols other architectures. It is concluded that efficient architectures can be built using hypercubes.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

In the last few years, Wireless Sensor Networks technology has been a hot topic, and depending on its self-organization feature, it utilized in many fields. The WSN is that collects different kinds of data from sensor nodes processes them to database center which will provide information users. But, because main tool collect nodes, problem energy consumption be caused. article mainly give exact reason why shows up pay attention solutions this problem. are very effective solving these...

With the development of urbanization and health city residents, it is necessary to evaluate analysis urban green space. Based on principle NDVI index, space Sino-Singapore Eco-city was estimated. It obtained by comparing building data measured in field reflect population number distribution. By overlapping different levels, specific condition that residents occupying levels can be obtained. In this case, Tianjin studied suggested as a with good suitable environment for residents.