scholarly journals An Integrated Horizon Picking Method for Obtaining the Main and Detailed Reflectors on Sub-bottom Profiler Sonar Image

2021 ◽  
Vol 13 (15) ◽  
pp. 2959
Author(s):  
Shaobo Li ◽  
Jianhu Zhao ◽  
Hongmei Zhang ◽  
Siheng Qu
Keyword(s):  
Bottom Sediment ◽  
Calculation Method ◽  
Main Process ◽  
Local Phase ◽  
Filtering Method ◽  
Diffusion Filtering ◽  
Phase Calculation ◽  
Different Types ◽  
Prime Objective ◽  
Series Of Experiments

A sub-bottom profiler (SBP) can capture the sediment interfaces and properties of different types of sediment. Horizon picking from SBP images is one of the most crucial steps in marine sub-bottom sediment interpretation. However, traditional horizon picking methods are good at obtaining the main horizons representing the main reflectors while ignoring the detailed horizons. While detailed horizons are the prime objective, many tiny structures caused by interference echoes will also be picked. To overcome this limitation, an integrated horizon picking method for obtaining the main and detailed horizons simultaneously is proposed in this paper. A total of three main process steps: the diffusion filtering method, the enhancement filtering method as well as the local phase calculation method, are used to help obtain the main and detailed horizons. The diffusion filtering method smooths the SBP images and preserves reflectors. Enhancement filtering can eliminate outliers and enhance reflectors. The local phase can be used to highlight all of the reflections and help in the choosing of detailed horizons. A series of experiments were then performed to validate the effectiveness of the proposed method, and good performances were achieved.

scholarly journals B-1 cell: the precursor of a novel mononuclear phagocyte with immuno-regulatory properties

2009 ◽  
Vol 81 (3) ◽  
pp. 489-496 ◽  
Author(s):  
José Daniel Lopes ◽  
Mario Mariano
Keyword(s):  
Mammalian Cells ◽  
Giant Cells ◽  
Mononuclear Phagocyte ◽  
Different Types ◽  
Series Of Experiments ◽  
B1 Cells ◽  
Regulatory Properties

Characterization of the origin, properties, functions and fate of cells is a fundamental task for the understanding of physiological and pathological phenomena. Despite the bulk of knowledge concerning the diverse characteristics of mammalian cells, some of them, such as B-1 cells, are still poorly understood. Here we report the results obtained in our laboratory on these cells in the last 10 years. After showing that B-1 cells could be cultured and amplified in vitro, a series of experiments were performed with these cells. They showed that B1 cells reside mostly in the peritoneal and pleural cavities, migrate to distant inflammatory foci, coalesce to form giant cells and participate in granuloma formation, both in vitro and in vivo. They are also able to present antigens to immunologically responsive cells and are endowed with regulatory properties. Further, we have also shown that these cells facilitate different types of infection as well as tumor growth and spreading. These data are presently reviewed pointing to a pivotal role that these cells may play in innate and acquired immunity.

scholarly journals Investigation on the Breakdown Characteristics of Different Types of Lightning Rods

2018 ◽  
Vol 17 (2) ◽  
pp. 1-5
Author(s):  
Noor Azlinda Ahmad ◽  
Rosniza Zainal ◽  
Zuraimy Adzis
Keyword(s):  
Breakdown Voltage ◽  
High Voltage ◽  
Horizontal Distance ◽  
Different Types ◽  
Series Of Experiments ◽  
Voltage Breakdown

This paper investigates the voltage breakdown characteristics of three types of lightning rods - blunt, sharp and flat. The objectives of this study are to determine the voltage breakdown characteristics of various types of lightning rods and to obtain the striking distance of each rod. A series of experiments were conducted in the high voltage laboratory consisting of individual testing rod, competitive testing rod and also horizontal distance changing. All three types of rods have been tested in each experiment in order to obtain a comprehensive result. The blunt rod has been proven as the best strike receptor in comparison to sharp and flat rod. This is because breakdown voltage for blunt rod is much lower (199 kV) than that of flat and sharp rod. Therefore, replacement of widely used sharp rod with the blunt one should be considered in order to provide better protection for buildings from lightning activities. 

scholarly journals Experimental investigation of the parameters of water solution purposes by ceramic, coal filters and reverse-osmotic module

2019 ◽  
pp. 30-33
Author(s):  
S.V. Gulienko
Keyword(s):  
Reverse Osmosis ◽  
Water Solution ◽  
Ceramic Filter ◽  
Main Process ◽  
Working Pressure ◽  
Ceramic Filters ◽  
Quality Of Water ◽  
Urgent Task ◽  
Wide Range ◽  
Series Of Experiments

The urgent task is to research in detail the possibilities of operation of the reverse osmosis membrane in the conditions of changing various parameters, which include, first of all, the working pressure, the initial concentration of the cleaning solutions, as well as the working conditions and the complete set of cleaning stands with auxiliary filters: mechanical, ceramic and carbon, which improves the quality of water and increases the life of high-value reverse osmosis modules. Particular attention was paid in this series of experiments to the role of ceramic filters, since in the previous series of experiments the concentration of the solution did not change both after mechanical and after carbon filters. Therefore, it was decided to modernize the stand and use a ceramic filter in the flow chart. In this work the detailed scheme of bench-scale setup with using of ceramic and carbon filters and also reverse-osmosis module is represented. The experimental reseaches of purification of NaCl water solutions were carried out in wide range of concentrations (0,2∙10-3…6,5 g/l) and working pressures (0,2…0,65 MPa). The comparative characteristics of main process parameters with and without ceramic filter are represented. The experiments were carried out on a laboratory stand for complex purification of aqueous solutions by microfiltration, adsorption and reverse osmosis using the following process steps carried out in the respective apparatus.

Crossmodal correspondences between chemosensory stimuli and musical notes

2012 ◽  
Vol 25 (0) ◽  
pp. 72
Author(s):  
Anne-Sylvie Crisinel ◽  
Charles Spence
Keyword(s):  
Musical Instruments ◽  
Crossmodal Correspondences ◽  
Musical Note ◽  
Water Based ◽  
Different Types ◽  
Potential Applications ◽  
Series Of Experiments ◽  
Components Analysis ◽  
Psychological Dimensions

We report a series of experiments investigating crossmodal correspondences between various food-related stimuli (water-based solutions, milk-based flavoured solutions, crisps, chocolate and odours) and sounds varying in pitch and played by four different types of musical instruments. Participants tasted or smelled stimuli before matching them to a musical note. Our results demonstrate that participants preferentially match certain stimuli to specific pitches and instrument types. Through participants’ ratings of the stimuli along a number of dimensions (e.g., pleasantness, complexity, familiarity or sweetness), we explore the psychological dimensions involved in these crossmodal correspondences, using principal components analysis (PCA). While pleasantness seems to play an important role in the choice of instrument associated with chemosensory stimuli, the pitch seems to also depend on the quality of the taste (bitter, salty, sour or sweet). The level at which such crossmodal correspondences might occur, as well as the potential applications of such results, will be discussed.

Analysis of Measurements in Vaned Diffusers of Centrifugal Compressors

1988 ◽  
Vol 110 (1) ◽  
pp. 115-121 ◽  
Author(s):  
W. Stein ◽  
M. Rautenberg
Keyword(s):  
Flow Field ◽  
Flow Structure ◽  
Calculation Method ◽  
Geometric Parameters ◽  
Variable Geometry ◽  
Centrifugal Compressors ◽  
Wide Range ◽  
Performance Curves ◽  
Different Types ◽  
Flow Phenomena

In vaned diffusers of centrifugal compressors many different flow phenomena interfere with one another, and different geometric parameters influence the flow field. Variations of these parameters allow the designer to optimize the diffuser for a certain application or to use a variable geometry for controlling the stage over a wide range. Two vaned diffusers that differ only in their passage widths are investigated using different types of measuring technique, in order to analyze the flow structure and to use it as a verification of a calculation method that allows detailed predictions of flow field parameters inside the diffuser, by taking into account geometric variations. Using this method predictions of the flow field of a variable geometry diffuser are made and are compared with the measured performance curves of the stage.

Packing Characteristics and Its Effect on Heat Transfer Characteristics in Melting of Granular Packed Bed Subject to Horizonal Forced Convection

2002 ◽  
Author(s):  
Y. L. Hao ◽  
Y.-X. Tao
Keyword(s):  
Heat Transfer ◽  
Forced Convection ◽  
Melting Process ◽  
Packed Bed ◽  
Time Interval ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Ice Particles ◽  
Different Types ◽  
Series Of Experiments

A series of experiments are conducted to investigate the characteristics and its effect on the melting and heat of a packed bed consisting of melting ice particles to horizontal forced convection. The volumes and situations of the melting ganular packed beds are by the visualization observations and measurements digital camcorders within the range of Re = 71 ~ 2291, Gr/Re2 = 1.48×10−5 ~ 17.32, and Ste = 0.0444 ~ 0.385, respectively. The mass of ice particles is measured at the time interval during the melting process. Two types of pattern can be found under the different conditions. The different types of heat transfer characteristics emerge in type of packing pattern. The correlations for each type of pattern are obtained based on the experimental results.

Spectroscopic studies of vanadium biosorption on different types of carbohydrate biomass

2013 ◽  
Vol 91 (3) ◽  
pp. 186-195 ◽  
Author(s):  
Jousy García ◽  
Juan Carlos González ◽  
María Inés Frascaroli ◽  
Silvia García ◽  
Patricia Blanes ◽  
...  
Keyword(s):  
Metal Ion ◽  
Orange Peel ◽  
Spectroscopic Studies ◽  
Visible Range ◽  
Water Molecules ◽  
Main Process ◽  
Paramagnetic Resonance ◽  
Oh Groups ◽  
Surface Level ◽  
Different Types

The biosorption potential of different types of carbohydrate biomass is investigated to evaluate their application to purify water contaminated by vanadium in environmentally relevant oxidation states (VIV and VV). Spectroscopic studies were done by electron paramagnetic resonance (EPR), vanadium nuclear magnetic resonance (51V NMR), circular dichroism (CD), and electronic absorption in the visible range (vis). Both d-galacturonic and d-glucuronic acids are major components of plant cellular wall polysaccharides. The interaction of VIV with the model ligands d-galacturonic and d-glucuronic acids showed that complexation starts at low pH values (pH 3) and that carboxylate and sugar–OH groups, as well as water molecules, are involved in the coordination. At pH > 4.5, coordination promotes the sugar–OH deprotonation and new species form with the ligand chelating the metal ion via oxygen atoms of carboxylate and of adjacent sugar–O− donors. The studies with pectin and citric acid show the ability of both compounds to partially reduce VV to VIV in solution and the EPR parameters suggest coordination of carboxylate, sugar–OH, and water molecules. The interaction of VV with biomass from different sources shows that grapefruit, orange peel, and plane tree fruit are the most suitable candidates for the biosorption of vanadium. Studies with VV and grapefruit (or the grainless stalk of corn) indicate that the reduction takes place at the “surface” of the solid. EPR studies on the interaction of VIV with different carbohydrate biomass show their ability to complex high amounts of VIV. We propose that the biosorption mechanism, when the biomass is in contact with VV species, involves sorption, reduction, and retention at the surface level of VIV coordinated by oxygen donors of the biomass. When the interaction starts with VIV, the main process just involves the uptake of the metal ion at the surface level.

Lumineszenzuntersuchungen zum Problem der Energieübertragung in organischen Molekülkristallen

1970 ◽  
Vol 25 (6) ◽  
pp. 955-966 ◽  
Author(s):  
F. Belitz
Keyword(s):  
Energy Transfer ◽  
Single Crystals ◽  
Fluorescence Spectra ◽  
Dipole Interaction ◽  
Main Process ◽  
Transfer Processes ◽  
Decay Times ◽  
Different Types ◽  
The Mean ◽  
Host Lattices

Abstract From fluorescence spectra and decay times of single crystals of 2.3-dimethylnaphthalene, phenanthrene and p-terphenyl doped with one or two different types of fluorescence molecules (anthracene and, or tetracene) informations about the energy transfer processes are obtained. For doping concentrations smaller than 4·10-4 Mol/Mol the transfer by excitons is the main process. The dipole-dipole interaction over distances more than 80 Å (14 mean molecular distances) can be excluded. The mean travelling distance of the excitons in the three host lattices was found to be 250 - 300 mean molecular distances.

Research on an improved anisotropic diffusion filtering method

2019 ◽  
Author(s):  
Feng Chao ◽  
Zhang Huquan ◽  
Pan shuxin ◽  
Yao Qingzhou ◽  
Wang Hongbin
Keyword(s):  
Anisotropic Diffusion ◽  
Filtering Method ◽  
Diffusion Filtering

A quantitative analysis of the effects of excitatory neurotoxins on retinal ganglion cells in the chick

1990 ◽  
Vol 4 (3) ◽  
pp. 217-223 ◽  
Author(s):  
Ngoh Ngoh Tung ◽  
Ian G. Morgan ◽  
David Ehrlich
Keyword(s):  
Retinal Ganglion Cells ◽  
Ganglion Cells ◽  
Amacrine Cells ◽  
Small Cells ◽  
Retinal Ganglion ◽  
Chick Retina ◽  
Area 5 ◽  
Different Types ◽  
Displaced Amacrine Cells ◽  
Series Of Experiments

AbstractThe present study examines the differential effects of three excitotoxins, kainic acid (KA), N-methyl-D-aspartate (NMDA), and α-amino-2,3-amino-2,3-dihydro-5- methyl-3-oxo-4- isoxazolepropanoic acid (AMPA) on neurons within the genglion cell layer (GCL) of the chick retina. Two-day-old chicks were given a single, 5 μl, intravitreal injection of KA, NMDA, or AMPA at a range of doses. Following treatment with 40 nmol KA, there was a 21% loss of neurons in the GCL. At 200 nmol KA, the loss increased to 46%. Exposure to KA eliminated mainly small neurons of soma area 5–15μm2, and medium-sized ganglion cells of soma area 15–25μm2. Large ganglion cells (>25μ,2) remained unaffected. The vast majority of small cells were probably displaced amarcrine cells. At a does of 3000 nmol NMDA, no further loss of cells was evident. Exposure to 200 nmol AMPA resulted in a 30% loss of large and some medium-sized ganglion cells. In a further series of experiments, exposure to excitotoxin was followed by a retinal scratch, which eliminated retinal ganglion cells within the axotomized region. The results indicate that only a small proportion of displaced amacrine cells are destroyed by NMDA and AMPA, whereas virtually all displaced amarine cells are sensitive to KA. The findings of this study indicate the existence of subclasses of ganglion cells with specificity towards different types of excitatory amino acids (EAA).

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