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  • 1
    Publication Date: 2022-08-19
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Yuan, D., Yin, X., Li, X., Corvianawatie, C., Wang, Z., Li, Y., Yang, Y., Hu, X., Wang, J., Tan, S., Surinati, D., Purwandana, A., Wardana, A., Ismail, M., Budiman, A., Bayhaqi, A., Avianto, P., Santoso, P., Kusmanto, E., Dirhamsyah, Arifin, Z., & Pratt, L. A Maluku Sea intermediate western boundary current connecting Pacific Ocean circulation to the Indonesian Throughflow. Nature Communications, 13(1), (2022): 2093, https://doi.org/10.1038/s41467-022-29617-6.
    Description: The Indonesian Throughflow plays an important role in the global ocean circulation and climate. Existing studies of the Indonesian Throughflow have focused on the Makassar Strait and the exit straits, where the upper thermocline currents carry North Pacific waters to the Indian Ocean. Here we show, using mooring observations, that a previous unknown intermediate western boundary current (with the core at ~1000 m depth) exists in the Maluku Sea, which transports intermediate waters (primarily the Antarctic Intermediate Water) from the Pacific into the Seram-Banda Seas through the Lifamatola Passage above the bottom overflow. Our results suggest the importance of the western boundary current in global ocean intermediate circulation and overturn. We anticipate that our study is the beginning of more extensive investigations of the intermediate circulation of the Indo-Pacific ocean in global overturn, which shall improve our understanding of ocean heat and CO2 storages significantly.
    Description: This study is supported by NSFC (D.Y., Z.W., Y.L., Y.Y., S.T., J.W., and X.L.: 41720104008; D.Y., J.W., Y.L., X.L., Y.Y., S.T., X.H., and X.Y.: 91858204), the National Key Research and Development Program of China (D.Y. and X.L.: 2020YFA0608800), CAS (D.Y., Z.W., J.W., and Y.L.: XDB42000000), projects. Affiliations 1 and 2 share the first position. D.Y. is supported by QMSNL (2018SDKJ0104-02), and Shandong Provincial (U1606402) and the “Kunpeng Outstanding Scholar Program” of the FIO/NMR of China, J.W. supported by NSFC (41776011), Z.W. by NSFC (41876025).
    Repository Name: Woods Hole Open Access Server
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  • 2
    Publication Date: 2022-05-26
    Description: Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(9),(2020): 2797-2814, https://doi.org/10.1175/JPO-D-19-0326.1.
    Description: Hydrographic measurements recently acquired along the thalweg of the Lifamatola Passage combined with historical moored velocity measurements immediately downstream of the sill are used to study the hydraulics, transport, mixing, and entrainment in the dense overflow. The observations suggest that the mean overflow is nearly critical at the mooring site, suggesting that a weir formula may be appropriate for estimating the overflow transport. Our assessment suggests that the weir formulas corresponding to a rectangular, triangular, or parabolic cross section all result in transports very close to the observation, suggesting their potential usage in long-term monitoring of the overflow transport or parameterizing the transport in numerical models. Analyses also suggest that deep signals within the overflow layer are blocked by the shear flow from propagating upstream, whereas the shallow wave modes of the full-depth continuously stratified flow are able to propagate upstream from the Banda Sea into the Maluku Sea. Strong mixing is found immediately downstream of the sill crest, with Thorpe-scale-based estimates of the mean dissipation rate within the overflow up to 1.1 × 10−7 W kg−1 and the region-averaged diapycnal diffusivity within the downstream overflow in the range of 2.3 × 10−3 to 10.1 × 10−3 m2 s−1. Mixing in the Lifamatola Passage results in 0.6–1.2-Sv (1 Sv ≡ 106 m3 s−1) entrainment transport added to the overflow, enhancing the deep-water renewal in the Banda Sea. A bulk diffusivity coefficient estimated in the deep Banda Sea yields 1.6 × 10−3 ± 5 × 10−4 m2 s−1, with an associated downward turbulent heat flux of 9 W m−2.
    Description: This study is supported by NSFC (91858204), the CAS Strategic Priority Research Program (XDB42000000), NSFC(41720104008, 41421005, 41876025), QMSNL (2018SDKJ0104-02), and the Shandong Provincial projects (U1606402). L. Pratt was supported by the U.S. NSF Grant OCE-1657870.
    Keywords: Diapycnal mixing ; Entrainment ; Internal waves ; Topographic effects ; In situ oceanic observations
    Repository Name: Woods Hole Open Access Server
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1289-1292 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Highly Nano-porous SiO2-ZrO2 aerogels were manufactured with tetraethylorthosilicate(TEOS) and zirconyl nitrate dihydrate (ZrO(NO3)2.5H2O) by the sol-gel method followed bysupercritical drying technique. The prepared aerogels are performed by SEM, FT-IR and BET tocharacterize and analyze the morphology and pore structure of SiO2-ZrO2 aerogels. The resultsshowed that:(i) The areogels are the typical of nano pores in the interval between 1〈Dp〈30 nm; (ii) thespecific surface areas varied from 300 to 620 m2/g with (SBET)MAX = 615.5 m2/g with 35wt% Zirconiaand the surface areas decreased with the increase of zirconia; The thermal conductivity attains 0.015W/(m.k) ; (iii) a mass of Si-O-Zr bands existed in the aerogels indicating a homogeneous distributionof the components on the nano scale
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1321-1324 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2282-2285 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low density SiO2-xZrO2 aerogels with x=35wt%, 65wt%, 75wt%, 90wt%, 95wt% wereprepared by CO2 supercritical drying technique with tetraethylorthosilicate (TEOS) and zirconyl nitratedihydrate (ZrO(NO3)2.2H2O) by hydrolytic polycondensation under different chemical conditions. Theprepared aerogels are performed by X-ray Diffraction (XRD), Transmission electron microscopy (TEM),Fourier transformed infrared spectroscopy (FT-IR) and BET surface areas to characterize and analyze themorphology and pore structure of SiO2-ZrO2 aerogels. The results showed that the SiO2-ZrO2 areogels arethe typical of nano mesopores and the average pore size is about 50 nm. The specific surface areas variedfrom 345.5 to 615.5 m2/g with (SBET)MAX = 615.5 m2/g with 20wt% Zirconia; Moreover a mass of Si-O-Zrbands formed in the aerogels and the formation mechanism of Si-O-Zr bands are also discussed
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2286-2289 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low-density xSiO2-(1-x)Al2O3 xerogels with x=0.9, 0.8, 0.7, 0.6 (mole fractions) wereprepared by sol-gel and non-supercritical drying. Silica alkogels, which were the framework of binarycomposite materials, formed from tetraethyl orthosilicate (TEOS) by hydrolytic condensation with amolar ratio of TEOS: H2O: alcohol: hydrochloric acid: ammonia =1: 4: 10: 7.5×10-4: 0.0375. Aluminumhydroxide derived from Al(NO3)3·9H2O and NH4OH acting in the alcohol solution under the condition ofcatalyst. After filtrating and washing, the precipitation was mixed into silica sols to form SiO2-Al2O3mixed oxide gels with different silicon and aluminum molar ratio. The structural change andcrystallization of the binary xerogels were investigated after heat treatment at 600 [removed info] for 2 h by the meansof X-ray diffraction. Nitrogen adsorption experiment was performed to estimate specific surface area,porous volume and pore size distribution. The structural change of xerogels was observed by FT-IRspectroscopy. The resulting mixed xerogels possess of mesoporous structure which is characteristic ofcylindrical pores, high specific surface area of 596-863 m2/g and a relatively narrow pore distribution of2.8-30 nm. Al2O3 is introduced into the SiO2 phase and some of Al-O-Si bonds form
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2104-2106 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Silica xerogels were prepared by sol-gel process and non-supercritical drying. Two kinds ofreinforcements, SiC whisker and short carbon fiber (CF), were chosen to control the shrinkage duringdrying process and improve the mechanical properties of xerogels. Microstructure and mechanicalproperties of samples were examined. It was found that the addition of SiC whisker could greatly improvethe elastic modulus of silica xerogels, while short CF could prominently decrease the volume shrinkageratio but could not improve the elastic modulus. Analysis showed that the difference between the tworeinforcement mechanisms was caused by the interface and the size of the doped fiber and whisker
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2238-2241 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The thin film deposited by electron beam physical vapor deposition (EB-PVD) on rotatingsubstrate was approached via a kinetic Monte Carlo (KMC) algorithm on a “surface” of tight-packed rows.The motivation is to study the surface morphology distribution of thin film along the substrate radial.Effective deposition rate model and effective incident angle model were established along the substrateradial. Two phenomena are incorporated in the KMC simulation: adatom-surface collision and adatomdiffusion. The KMC simulations show that the surface roughness of thin film is small and the changing ofsurface roughness is small near the side of rotation axis, however, the surface roughness is big near theside of substrate edge, and the surface roughness increases quickly with the increasing of substrate radiuswhen r〉300 mm. The simulation results indicate that the effective incident angle is the main factor tocause the changing of surface roughness: the effective incident angle does not reach critical value and thedeposition rate difference is small when the radius is less than 300 mm, so the surface roughness of thinfilm in the scope is small and its changing is small, but when r〉300 mm, the effective incident anglesincrease sharply with radius increasing and all of them are above the critical value, which cause surfaceroughness of thin film to increase quickly. Experiments reveal that the KMC method can predict surfaceroughness distribution of thin film deposited by EB-PVD on rotating substrate
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 235-238 
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Two-step acid-base catalyzed silica xerogels were prepared through sol-geland ambient pressure drying. Various additive components were main fators whichinfluenced the porosity of silica xerogles. An orthogonal array (OA) design OA9(34)was applied to select the optimum conditions of additives. The effects of the molarratio of H2O, alcohol, HCl, and ammonia were evaluated on the basis of the othersame process parameters. Every experiment was conducted several times underdifferent process conditions which included reactive temperature, the acid catalyzedtime, aging, exchanging solvent and drying for assuring gels formed. The porositywas an index which was used to appraise the characteristic of silica xerogels. Twokinds of silica xerogels, prepared by the most optimal molar ratio (OMR) and the bestOA experiment respectively, were compared by means of SEM. The results showedthat the most OMR of TEOS, H2O, alcohol, HCl and ammonia was 1:4:10:7.5×10-4:0.0375
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1813-1816 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the process of preparation of high silicon steel by EB-PVD, the effect of distancebetween ingot and substrate on the weight percent of silicon in the silicon steel was investigatedthrough specially designed experiment. Energy dispersive spectroscopy (EDS), optical microscope(OM), scanning electron microscopy (SEM), x-ray diffraction (XRD) were used to characterize theweight percent of silicon, microstructure, crystal grain size and phase of the high silicon steel. Theexperimental results show that the weight percent of silicon in the silicon steel decreases withincreasing of the distance between ingot and substrate, when the distance is about 415 mm, highsilicon steel can be fabricated by EB-PVD. The microstructure of the high silicon steel was composedof columnar crystal grain, the size of the crystal is about 25-50 μm. The material back to the substrateside is composed of B2 and exhibits strong {400} texture
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