Millet Chen

Millet Chen

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70
Publications
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774
Citations
Citations since 2016
1 Research Item
270 Citations
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050
201620172018201920202021202201020304050

Publications

Publications (70)
Article
Buoyant model experiment and numerical simulation of flow field were performed to investigate the mechanism of flow induced underwater cavity and the problem of frequency prediction. Normal fairwater model and opening fairwater were chosen in the experiment. A series of vibration line spectrums caused by the opening were detected. Detailed flow fie...
Article
In order to investigate the origin and age of a bowl-shaped crater with 1.8 km diameter in northeastern China, a core drilling about 110 m in total was carried out in 2009 at the center of the crater. A 106-m-thick unit of lacustrine sediment is revealed under a surface layer of about 1 m of yellow soil. The impact origin has been confirmed based o...
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Quartz and feldspar in the strongly shocked gneiss in the impact breccias from the Xiuyan Crater have widely transformed to diaplectic glasses. The shock pressure in the rock is estimated to be 40-50 GPa. No melting of minerals was caused.
Article
Purpose: Accurate dosedelivery is a key component in the success of radiation therapy. The dose verification is especially important in the high complexity treatments, such as Intensity Modulated Radiation Therapy(IMRT) and Volumetric Modulated Arc Therapy (VMAT). Our purpose was to evaluate the dosimetric performance of our newly installed Elekta...
Article
Full-text available
Regional air quality simulations were conducted for summers 2001-2005 in the eastern US and subjected to extensive evaluation using various ground and airborne measurements. A brief climate evaluation focused on transport by comparing modeled dominant map types with ones from reanalysis. Reasonable agreement was found for their frequency of occurre...
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Full-text available
Regional climate and air quality simulations were conducted for summers 2001–2005 in the eastern US and subjected to extensive evaluation using various ground and airborne measurements. Climate evaluation focused on transport by comparing modeled dominant map types with ones from reanalysis. Reasonable agreement was found for their frequency of occ...
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Full-text available
Under the shock-induced high pressures and temperatures, olivine and pyroxene in the Suizhou L6 chondrite kept intact, but plagioclase experienced melting and quenching, and transformed into maskelynite, a melted dense plagioclase glass. Two occurrence types of maskelynite can be observed in this meteorite. One is the thetomorphic maskelynite, an i...
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A three week field campaign was conducted at the Duke Forest, NC, Forest-Atmosphere Carbon Transfer and Storage-I Research Facility (FACTS-I) during the time period of September 10 - September 28, 2004. For the first time measurements of volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), O3, NO, CO2, organic and inorganic aerosols were con...
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The Suizhou L6 chondrite contains a few very thin shock melt veins of 0.02-0.09mm in width. Shock-induced high-pressure mineral phases such as coarse-grained ringwoodite, majorite, NaAlSi3 O8, -hollandite, tuite, (Mg, Fe) SiO3-ilmenite, (Mg, Fe) SiO3-perovskite glass, two postspinel polymorphs of chromite - CaTi2O4 - and CaFe2O1- structured phases,...
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The study and comprehensive analysis of static high-pressure quenching experiments and laboratory dynamic high-pressure experiments on chondrites, as well as the study of shock-induced phase transition of minerals in the Suizhou meteorite revealed that the P-T conditions for phase transition of minerals during natural impact events, such as collisi...
Article
We investigated the H6-chondrite Yamato 75267, in which a fusion crust cuts a shock melt vein. The shock vein region, more than 280 μm from the fusion crust, contains high-pressure phases, such as ringwoodite, majorite-pyropess garnet and NaAlSi3O8 hollandite. However, the shock vein close to the fusion crust entirely consists of the low-pressure p...
Article
We investigated the H6-chondrite Yamato 75267, in which a fusion crust cuts a shock melt vein. The shock vein region, more than 280 μm from the fusion crust, contains high-pressure phases, such as ringwoodite, majorite-pyropess garnet and NaAlSi3O8 hollandite. However, the shock vein close to the fusion crust entirely consists of the low-pressure p...
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We report a transparent hard disordered carbon from Popigai and Ries. A novel optical and Raman diagnostic method to identify secondary graphite (formed by diamond-graphite back inversion at high post-shock temperatures) is presented.
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We report the first evidence for the back transformation of high- to low- pressure polymorphs in shock veins near fusion crusts in ordinary chondrites, which leads to quantification of the high-temperature regime depth below the fusion crusts.
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We have discovered and experimentally confirmed the presence of a high-pressure polymorph of Ca3(PO4)2 in the Suizhou meteorite. The high-pressure Ca3(PO4)2 polymorph in Suizhou likely represents the first naturally occurring example of this phase.
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We report two new natural shock-induced very dense polymorphs of rutile from suevites of the Ries Crater, Germany. This finding sets entirely new parameters for a robust estimation of peak-shock pressures and post-shock temperatures not accounted for before.
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A post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters a = 4.375(1) angstroms, b = 4.584(1) angstroms, c = 4.708(1) angstroms, β= 9...
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We have used a transmission electron microscope (TEM) to investigate the hollandite-structured high-pressure polymorph of plagioclase in the L6 chondrites Sixiangkou and Tenham.
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Transmission electron microscopy and electron diffraction show that the martian meteorite Shergotty, a shocked achondrite, contains a dense orthorhombic SiO2 phase similar to post-stishovite SiO2 with the alpha-PbO2 structure. If an SiO2 mineral exists in Earth's lower mantle, it would probably occur in a post-stishovite SiO2 structure. The presenc...
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Electron and X-ray diffraction confirm that SiO2 in Shergotty consists of two very dense polymorphs in addition to stishovite. All three of these high-density structures are quench phases from post-stishovite structures stable at 47 to >80 GPa.
Article
The Yanzhuang H-chondrite consists of a severely deformed chondritic matric and thick shock-induced veins. The shock veins contain both a coarse-grained assemblage olivine plus pyroxene that recrystallized in solid-state and a fine-grained assemblage olivine plus pyroxene that crystallized from shock-induced silicate melt, as well as silicate melt...
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Samples of the Jilin H5 chondrite were experimentally shock-loaded at the peak pressures of 12, 27, 39, 53, 78, 83, 93, and 133 GPa. The aim of this study is to compare experimentally shock-induced phenomena with those in naturally shocked chondrites and to test the feasibility of experimentally calibrating naturally induced shock phenomena in Hand...
Article
Smooth grains in the Peace River shocked matrix previously described as maskelynite are not diaplectic glass but a crystalline phase with a stoichiometric composition. They formed upon decompression by inversion of a parental high-pressure polymorph that crystallized from a dense K-rich melt. They are surrounded by radiating cracks that have extens...
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TEM is used to characterize the melt-vein assemblage in the Tenham L6 chondrite to determine if the mineralogy and microstructures are similar to those in Sixangkou. Backscatter electron imaging images obtained with the field emission SEM clearly resolve the majorite(ss) garnets and other phases in the matrix. It is inferred that the temperature gr...
Article
High-pressure minerals in the Sixiangkou (L6) chondrite contain micro-structures that can be used to constrain the time scale of shock metamorphism. Crystallization of majorite-pyrope garnet and magnesiowustite from a silicate melt at high pressure and temperature required micrometer-scale diffusion at high pressure. Large polycrystalline ringwoodi...
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Full-text available
Two coexisting distinct high pressure assemblages were discovered in shock melt veins of the Sixiangkou (L6) chondrite: (1) majorite-pyrope(sub)ss + magnesiowustite and (2) ringwoodite + low-Ca majorite. The majorite-pyrope(sub)ss + magnesiowustite evidently crystallized from a dense melt of bulk Sixiangkou composition that was produced by shock-fu...
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Mbale is a shocked L6 chondrite [1]. Some shock-induced veins of 0.1 to 2 mm width intersect the meteorite. The veins consist of diaplectic plagioclase glass, unmelted silicate fragments including olivines and pyroxenes, and the shock-induced melt materials consisting of metal-troilite intergrowths, microcrystalline pyroxene and olivine, and silica...
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The Sixiangkou chondrite (L6) is a rare example of heavily shocked chondrites. The meteorite is intersected by black silicate melt veins containing isotropic phases formed by shock transformation of silicates. Grains of olivine and pyroxene compositions in the veins are either isotropic mineral glass or ringwoodite or majorite respectively. Plagioc...
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Rutile is isostructural with stishovite. Its behavior at high pressures is considered to offer an analogy that would allow to explore post-stishovite phase transitions. Diamond anvil cell experiments on rutile up to pressures in excess of 55 GPa revealed four dense polymorphs: (1) an orthorhombic alpha -PbO2 phase (TiO2 II; space group (Pbcn), stab...
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By addition of 0.3% NHâHCOâ instead of animal manure into rural biogas digester in which the rotted rice straw was the major feedstock, the biogas yield doubled in comparison with the check digester (0.1 m³/m³/d) and the fertility of NHâHCOâ did not decrease because of biogas fermentation. Many digesters have been built in China. But, owing to th...

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