Gravity Effect on the Formation of Periodic Precipitation Patterns

2000 ◽  
Vol 65 (9) ◽  
pp. 1438-1442 ◽  
Author(s):  
Vladislav Holba ◽  
Frederik Fusek
Keyword(s):  
Gravitational Field ◽  
Spatial Arrangement ◽  
Experimental Results ◽  
Single Sample ◽  
Gravity Effect ◽  
Periodic Precipitation ◽  
Precipitation Patterns ◽  
Liesegang Bands

The effect of gravity on the formation of Liesegang patterns of Ag2Cr2O7in gelatin and that of PbI2in agar was investigated. Spatial arrangement of Liesegang bands was measured in the parallel and antiparallel orientation to the gravitational field in a single sample with all other parameters kept fixed. The experimental results are discussed in terms of the prenucleation theory of periodic precipitation.

scholarly journals Thermal Steady States of Gases in a Gravitational Field

2011 ◽  
Vol 66 (1-2) ◽  
pp. 123-133
Author(s):  
Kunihiko Kigoshi
Keyword(s):  
Heat Transfer ◽  
Gravitational Field ◽  
Temperature Difference ◽  
Thermal Gradient ◽  
Vertical Direction ◽  
Steady States ◽  
Gas Pressure ◽  
Experimental Results ◽  
Gravity Effect ◽  
Gas Molecules

This paper presents results on observations of a temperature difference between the top and bottom of a vessel filled with gas in a gravitational field. The observed temperature at the top of the vessel was always lower than the temperature at the bottom of the vessel, and this temperature difference was persistent and steady over more than 20 h. The magnitude of the temperature difference depends on the types of gas molecules present but is independent of the gas pressure in the vessel within the range from 2.7×104 Pa to 27 Pa. A temperature difference between the top and the bottom is only observed along the vertical direction and is only observed when the vessel contains a gas. These experimental results indicate a gravity effect on molecular heat transfer which enables the transport of energy in the gas without a thermal gradient.

Independence of Primary and Secondary Structures in Periodic Precipitation Patterns

2011 ◽  
Vol 2 (4) ◽  
pp. 345-349 ◽  
Author(s):  
Stoyan K. Smoukov ◽  
István Lagzi ◽  
Bartosz A. Grzybowski
Keyword(s):  
Secondary Structures ◽  
Periodic Precipitation ◽  
Precipitation Patterns

scholarly journals Interactive Trimap Generation for Digital Matting Based on Single-Sample Learning

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 659 ◽  
Author(s):  
Zhenpeng Chen ◽  
Yuanjie Zheng ◽  
Xiaojie Li ◽  
Rong Luo ◽  
Weikuan Jia ◽  
...  
Keyword(s):  
Image Processing ◽  
Semantic Segmentation ◽  
Experimental Results ◽  
Single Sample ◽  
Binary Mask ◽  
Image Matting ◽  
Prediction Task ◽  
Learning Technique ◽  
Step Algorithm ◽  
Remarkable Progress

Image matting refers to the task of estimating the foreground of images, which is an important problem in image processing. Recently, trimap generation has attracted considerable attention because designing a trimap for every image is labor-intensive. In this paper, a two-step algorithm is proposed to generate trimaps. To use the proposed algorithm, users must only provide some clicks (foreground clicks and background clicks), which are employed as the input to generate a binary mask. One-shot learning technique achieves remarkable progress on semantic segmentation, we extend this technique to perform the binary mask prediction task. The mask is further used to predict the trimap using image dilation. Extensive experiments were performed to evaluate the proposed algorithm. Experimental results show that the trimaps generated using the proposed algorithm are visually similar to the user-annotated ones. Comparing with the interactive matting algorithms, the proposed algoritm is less labor-intensive than trimap-based matting algorithm and achieved more accuate results than scribble-based matting algorithm.

scholarly journals Quasi-Classical Gravity Effect on Neutrino Oscillations in a Gravitational Field of a Heavy Astrophysical Object

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Jonathan Miller ◽  
Roman Pasechnik
Keyword(s):  
Gravitational Field ◽  
Cross Sections ◽  
Large Angle ◽  
Classical Case ◽  
Indirect Detection ◽  
Quantum Decoherence ◽  
Gravity Effect ◽  
Weak Boson ◽  
Astrophysical Neutrinos ◽  
A New Technique

In the framework of quantum field theory, a graviton interacts locally with a quantum state having definite mass, that is, the gravitational mass eigenstate, while a weak boson interacts with a state having definite flavor, that is, the flavor eigenstate. An interaction of a neutrino with an energetic graviton may trigger the collapse of the neutrino to a definite mass eigenstate with probability expressed in terms of PMNS mixing matrix elements. Thus, gravitons would induce quantum decoherence of a coherent neutrino flavor state similarly to how weak bosons induce quantum decoherence of a neutrino in a definite mass state. We demonstrate that such an essentially quantum gravity effect may have strong consequences for neutrino oscillation phenomena in astrophysics due to relatively large scattering cross sections of relativistic neutrinos undergoing large angle radiation of energetic gravitons in gravitational field of a classical massive source (i.e., the quasi-classical case of gravitational Bethe-Heitler scattering). This graviton-induceddecoherenceis compared todecoherencedue to propagation in the presence of the Earth matter effect. Based on this study, we propose a new technique for the indirect detection of energetic gravitons by measuring the flavor composition of astrophysical neutrinos.

scholarly journals Modelling of Permeation Grouting considering Grout Self-Gravity Effect: Theoretical and Experimental Study

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Yanbin Fu ◽  
Xiuling Wang ◽  
Sizhan Zhang ◽  
Yong Yang
Keyword(s):  
Prediction Model ◽  
Power Law ◽  
Diffusion Theory ◽  
Injection Pressure ◽  
Experimental Results ◽  
Gravity Effect ◽  
Distribution Law ◽  
Permeation Grouting ◽  
Significant Difference ◽  
Self Gravity

Self-gravity is one key parameter for behavior characterization of grout permeation and diffusion. This study proposes mathematical models for permeation grouting with consideration of grout self-gravity effect. The models concerning power law, Bingham, and Newtonian grouts are based on the generalized Darcy’s law and spherical diffusion theory. In addition, a prediction model of grout concretion dimension used for Bingham grout was developed. An analysis of the injection pressure distribution law and a comparative evaluation of diffusion radius considering self-gravity effect using established models were conducted subsequently. Moreover, grouting experiments were performed to check and verify the prediction model. The experimental results showed that injection pressure decreases linearly with increase of diffusion radius for the power-law grout, while nonlinear decrease of injection pressure was confirmed in Bingham and Newtonian grouts in this case. Three grouts approximately diffuse in an “ellipsoidal” shape, and it is confirmed that the diffusion radius is closely related to grout self-gravity. The Newtonian grout produces the maximum diffusion radius compared with the other two grouts whether the gravity effects were considered or not. The grout quantity under a smaller water-to-cement w/c ratio exhibits a significant difference and undergoes two increasing stages, whereas the quantity simply tends to be stable after it reaches its maximum in terms of the larger w/c ratios. The constructed dimension prediction model agrees well with the experimental results, which can be helpful for design and assessment of the grouting scheme.

scholarly journals ROTATABLE-TORSION-BALANCE EQUIVALENCE PRINCIPLE EXPERIMENT FOR THE SPIN-POLARIZED HoFe3

2001 ◽  
Vol 16 (12) ◽  
pp. 763-773 ◽  
Author(s):  
LI-SHING HOU ◽  
WEI-TOU NI
Keyword(s):  
Gravitational Field ◽  
Equivalence Principle ◽  
Rotation Period ◽  
Torsion Balance ◽  
Experimental Results ◽  
Polarized Electrons ◽  
The Earth ◽  
Spin Polarized ◽  
Order Of Magnitude

We use a rotatable torsion balance to perform an equivalence principle test on a magnetically shielded spin-polarized body of HoFe 3. With a rotation period of one hour, the period of possible signal is reduced from one solar day by 24 times, and hence the 1/f noise is greatly reduced. Our present experimental results give a limit of (-0.68 ± 0.90) × 10-9 on the Eötvös parameter [Formula: see text] and a limit of (1.8 ± 5.3) × 10-9 on the Eötvös parameter [Formula: see text] of equivalence of the polarized body compared with unpolarized aluminum–brass cylinders in the solar gravitational field, and a limit (-0.24 ± 0.55) × 10-9 on the Eötvös parameter [Formula: see text] in the earth gravitational field. This improves the previous limit on the Eötvös parameter [Formula: see text] for polarized electrons in the solar gravitational field by one order of magnitude.

Wet Stamping of Microscale Periodic Precipitation Patterns

2005 ◽  
Vol 109 (7) ◽  
pp. 2774-2778 ◽  
Author(s):  
I. T. Bensemann ◽  
M. Fialkowski ◽  
B. A. Grzybowski
Keyword(s):  
Periodic Precipitation ◽  
Precipitation Patterns

Curiosities in Periodic Precipitation Patterns

Science ◽  
1982 ◽  
Vol 216 (4546) ◽  
pp. 635-637 ◽  
Author(s):  
S. C. MULLER ◽  
S. KAI ◽  
J. ROSS
Keyword(s):  
Periodic Precipitation ◽  
Precipitation Patterns
Sign in / Sign up

Export Citation Format

Share Document