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On October 10, 2023 at 6:13:33 PM UTC, Administrator:
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Renamed resource readme.txt to README in A grain-size driven transition in the deformation mechanism in slow snow compression
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Added field
publication_state
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Changed value of field
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of resource README to{"allowed_users": "", "level": "public", "shared_secret": ""}
(previously{"level":"public","allowed_users":"","shared_secret":""}
) in A grain-size driven transition in the deformation mechanism in slow snow compression -
Changed value of field
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of resource README to{}
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4 | \"\", \"email\": \"sundu.kavitha@slf.ch\", \"given_name\": | 4 | \"\", \"email\": \"sundu.kavitha@slf.ch\", \"given_name\": | ||
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7 | Research SLF\", \"affiliation_02\": \"\", \"affiliation_03\": \"\", | 7 | Research SLF\", \"affiliation_02\": \"\", \"affiliation_03\": \"\", | ||
8 | \"email\": \"rafael.ottersberg@unibe.ch\", \"given_name\": \"Rafael\", | 8 | \"email\": \"rafael.ottersberg@unibe.ch\", \"given_name\": \"Rafael\", | ||
9 | \"identifier\": \"\", \"name\": \"Ottersberg\"}, {\"affiliation\": | 9 | \"identifier\": \"\", \"name\": \"Ottersberg\"}, {\"affiliation\": | ||
10 | \"WSL Institute for Snow and Avalanche Research SLF\", | 10 | \"WSL Institute for Snow and Avalanche Research SLF\", | ||
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12 | \"jaggi@slf.ch\", \"given_name\": \"Matthias\", \"identifier\": \"\", | 12 | \"jaggi@slf.ch\", \"given_name\": \"Matthias\", \"identifier\": \"\", | ||
13 | \"name\": \"Jaggi\"}, {\"affiliation\": \"WSL Institute for Snow and | 13 | \"name\": \"Jaggi\"}, {\"affiliation\": \"WSL Institute for Snow and | ||
14 | Avalanche Research SLF\", \"affiliation_02\": \"\", | 14 | Avalanche Research SLF\", \"affiliation_02\": \"\", | ||
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22 | "doi": "10.16904/envidat.436", | 22 | "doi": "10.16904/envidat.436", | ||
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n | 39 | "metadata_modified": "2023-10-10T18:13:08.769887", | n | 39 | "metadata_modified": "2023-10-10T18:13:33.911395", |
40 | "name": "slow-snow-compression", | 40 | "name": "slow-snow-compression", | ||
41 | "notes": "We conducted consecutive loading-relaxation experiments at | 41 | "notes": "We conducted consecutive loading-relaxation experiments at | ||
42 | low strain rates to study the viscoplastic behavior of the intact ice | 42 | low strain rates to study the viscoplastic behavior of the intact ice | ||
43 | matrix in snow. The experiments were conducted using a | 43 | matrix in snow. The experiments were conducted using a | ||
44 | micro-compression stage within the X-ray tomography scanner in the SLF | 44 | micro-compression stage within the X-ray tomography scanner in the SLF | ||
45 | cold laboratory. \r\n\r\nNext, to evaluate the experiments, a novel, | 45 | cold laboratory. \r\n\r\nNext, to evaluate the experiments, a novel, | ||
46 | implicit solution of a transient scalar model was developed to | 46 | implicit solution of a transient scalar model was developed to | ||
47 | estimate the stress exponent and time scales in the effective creep | 47 | estimate the stress exponent and time scales in the effective creep | ||
48 | relation (Glen's law). The result reveals that, for the first time, a | 48 | relation (Glen's law). The result reveals that, for the first time, a | ||
49 | transition in the exponent in Glen's law depends on geometrical grain | 49 | transition in the exponent in Glen's law depends on geometrical grain | ||
50 | size. A cross-over of stress exponent $n=1.9$ for fine grains to | 50 | size. A cross-over of stress exponent $n=1.9$ for fine grains to | ||
51 | $n=4.4$ for coarse grains is interpreted as a transition from grain | 51 | $n=4.4$ for coarse grains is interpreted as a transition from grain | ||
52 | boundary sliding to dislocation creep. \r\n\r\n\r\nThe dataset | 52 | boundary sliding to dislocation creep. \r\n\r\n\r\nThe dataset | ||
53 | includes compression force data from 11 experiments and corresponding | 53 | includes compression force data from 11 experiments and corresponding | ||
54 | 3D image data from tomography scans.\r\n", | 54 | 3D image data from tomography scans.\r\n", | ||
55 | "num_resources": 2, | 55 | "num_resources": 2, | ||
56 | "num_tags": 5, | 56 | "num_tags": 5, | ||
57 | "organization": { | 57 | "organization": { | ||
58 | "approval_status": "approved", | 58 | "approval_status": "approved", | ||
59 | "created": "2018-11-15T15:27:32.106204", | 59 | "created": "2018-11-15T15:27:32.106204", | ||
60 | "description": "The core topic of the team \"Snow Physics\" is | 60 | "description": "The core topic of the team \"Snow Physics\" is | ||
61 | structure and property of snow and firn at different scales. Our most | 61 | structure and property of snow and firn at different scales. Our most | ||
62 | important tools in the cold laboratory are micro-computed tomography | 62 | important tools in the cold laboratory are micro-computed tomography | ||
63 | (micro-CT), nature-identical snow production, and our in-house | 63 | (micro-CT), nature-identical snow production, and our in-house | ||
64 | designed snow-breeders.\r\n\r\nBased on the three-dimensional | 64 | designed snow-breeders.\r\n\r\nBased on the three-dimensional | ||
65 | representation of snow, we can now calculate fundamental structural | 65 | representation of snow, we can now calculate fundamental structural | ||
66 | parameters as density variations at a spatial resolution of a few | 66 | parameters as density variations at a spatial resolution of a few | ||
67 | millimeters, e.g. revealing the finely layered structure of weak | 67 | millimeters, e.g. revealing the finely layered structure of weak | ||
68 | layers or of polar firn. In addition, the readily available data are | 68 | layers or of polar firn. In addition, the readily available data are | ||
69 | used to calculate the correlation function in all 3D, which enables a | 69 | used to calculate the correlation function in all 3D, which enables a | ||
70 | deeper understanding of the interactions between structure and | 70 | deeper understanding of the interactions between structure and | ||
71 | functional properties, e.g. for microwaves.\r\n\r\nIn addition, we are | 71 | functional properties, e.g. for microwaves.\r\n\r\nIn addition, we are | ||
72 | able to use the exact microstructure of snow for numerical | 72 | able to use the exact microstructure of snow for numerical | ||
73 | simulations. Our own or adapted codes allow to calculate thermal | 73 | simulations. Our own or adapted codes allow to calculate thermal | ||
74 | conductivity, mechanical properties, and optical properties. Direct | 74 | conductivity, mechanical properties, and optical properties. Direct | ||
75 | numerical simulation proves to be a highly valuable tool to understand | 75 | numerical simulation proves to be a highly valuable tool to understand | ||
76 | the complexity of snow.\r\n\r\nOur micro-CT is equipped with the | 76 | the complexity of snow.\r\n\r\nOur micro-CT is equipped with the | ||
77 | ability to perform time-lapse tomography using so called | 77 | ability to perform time-lapse tomography using so called | ||
78 | snow-breeders. The snow breeder made the first in-situ time-lapse | 78 | snow-breeders. The snow breeder made the first in-situ time-lapse | ||
79 | movie of metamorphosing snow under a temperature gradient | 79 | movie of metamorphosing snow under a temperature gradient | ||
80 | possible.\r\n\r\nOur developments don't stop at the microstructure. | 80 | possible.\r\n\r\nOur developments don't stop at the microstructure. | ||
81 | The quantification of snow properties at the larger scale of a snow | 81 | The quantification of snow properties at the larger scale of a snow | ||
82 | profile or on a field requires new techniques to link the micro- to | 82 | profile or on a field requires new techniques to link the micro- to | ||
83 | the macro-scale. For this purpose we developed the SnowMicroPen, a | 83 | the macro-scale. For this purpose we developed the SnowMicroPen, a | ||
84 | high-resolution penetrometer, which is able to discern different snow | 84 | high-resolution penetrometer, which is able to discern different snow | ||
85 | types using signal processing. Near-infrared photography has become a | 85 | types using signal processing. Near-infrared photography has become a | ||
86 | standard tool to quantify spatial variation of the specific surface | 86 | standard tool to quantify spatial variation of the specific surface | ||
87 | area, and, concurrently, the equivalent optical grain size. Currently, | 87 | area, and, concurrently, the equivalent optical grain size. Currently, | ||
88 | we are developing new optical techniques which try to measure density | 88 | we are developing new optical techniques which try to measure density | ||
89 | and specific surface area at the same time.", | 89 | and specific surface area at the same time.", | ||
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209 | ], | 210 | ], | ||
210 | "title": "A grain-size driven transition in the deformation | 211 | "title": "A grain-size driven transition in the deformation | ||
211 | mechanism in slow snow compression", | 212 | mechanism in slow snow compression", | ||
212 | "type": "dataset", | 213 | "type": "dataset", | ||
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215 | } | 216 | } |