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  • 1
    Electronic Resource
    Electronic Resource
    Hard-sphere radial distribution functions for face-centered cubic and hexagonal close-packed phases: Representation and use in a solid-state perturbation theory (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7548-7561 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hard-sphere radial distribution functions, gHS(r/d,η), for the face-centered cubic and hexagonal close-packed phases have been computed by the Monte Carlo method at nine values of the packing fraction, η[=(π/6)ρd3], ranging from 4% below the melting density to 99% of the close-packed density. The Monte Carlo data are used to improve available analytic expressions for gHS(r/d,η). By utilizing the new gHS(r/d,η) in the Henderson and Grundke method [J. Chem. Phys. 63, 601 (1975)], we next derive an expression for yHS(r/d,η) [=gHS(r/d)exp{βVHS(r)}] inside the hard-sphere diameter, d. These expressions are employed in a solid-state perturbation theory [J. Chem. Phys. 84, 4547 (1986)] to compute solid-state and melting properties of the Lennard-Jones and inverse-power potentials. Results are in close agreement with Monte Carlo and lattice-dynamics calculations performed in this and previous work. The new gHS(r/d,η) shows a reasonable thermodynamic consistency as required by the Ornstein–Zernike relation. As an application, we have constructed a high-pressure phase diagram for a truncated Lennard-Jones potential. From this study, we conclude that the new gHS(r/d,η) is an improvement over available expressions and that it is useful for solid-state calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461381
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  • 2
    Electronic Resource
    Electronic Resource
    Phase diagram of a Lennard-Jones solid (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9917-9919 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A phase diagram of a Lennard-Jones solid at kT/ε≥0.8 is constructed by our recent perturbation theory. It shows the stability of the face-centered-cubic phase except within a small pressure and temperature domain, where the hexagonal-close packed phase may occur. The theory predicts anharmonic contributions to the Helmholtz free energy (important to the crystal stability) in good agreement with Monte Carlo data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465389
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  • 3
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    Effect of deformation induced nonlinear and anisotropic elasto-plasticity on sheet forming simulations (2018)
    Institute of Physics
    Details
    Publication Date: 2018-07-01
    Print ISSN: 1742-6588
    Electronic ISSN: 1742-6596
    Topics: Physics
    Published by Institute of Physics
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  • 4
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    Latitudinal Change of Tropical Cyclone Maximum Intensity in the Western North Pacific (2015)
    Hindawi
    Details
    Publication Date: 2015-12-25
    Description: This study obtained the latitude where tropical cyclones (TCs) show maximum intensity and applied statistical change-point analysis on the time series data of the average annual values. The analysis results found that the latitude of the TC maximum intensity increased from 1999. To investigate the reason behind this phenomenon, the difference of the average latitude between 1999 and 2013 and the average between 1977 and 1998 was analyzed. In a difference of 500 hPa streamline between the two periods, anomalous anticyclonic circulations were strong in 30°–50°N, while anomalous monsoon trough was located in the north of South China Sea. This anomalous monsoon trough was extended eastward to 145°E. Middle-latitude region in East Asia is affected by the anomalous southeasterlies due to these anomalous anticyclonic circulations and anomalous monsoon trough. These anomalous southeasterlies play a role of anomalous steering flows that make the TCs heading toward region in East Asia middle latitude. As a result, TCs during 1999–2013 had higher latitude of the maximum intensity compared to the TCs during 1977–1998.
    Print ISSN: 1687-9309
    Electronic ISSN: 1687-9317
    Topics: Geosciences , Physics
    Published by Hindawi
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  • 5
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    Climatological Features of Korea-Landfalling Tropical Cyclones (2015)
    Hindawi
    Details
    Publication Date: 2015-12-28
    Description: The present study analyzed the interdecadal variation by applying the statistical change-point analysis to the frequency of the tropical cyclone (TC) that landed in the Korean Peninsula (KP) for the recent 54 years (1951 to 2004) and performed cluster classification of the Korea-landfall TC tracks using a Fuzzy Clustering Method (FCM). First, in the interdecadal variation analysis, frequency of TC that landed in the KP was largely categorized into three periods: high frequency period from 1951 to 1965, low frequency period from 1966 to 1985, and high frequency period from 1986 to 2004. The cluster analysis result of the Korea-landfall TC tracks produced the optimum number of clusters as four. In more detail, Cluster A refers to a pattern of landing in the southern coast in the KP starting from East China Sea followed by heading north while Cluster B refers to a pattern of landing in the west coast of the Korean Peninsula, also starting from East China Sea followed by heading north. Cluster C refers to a pattern of landing in the southern region of the west coast in the KP moving from mainland China while Cluster D refers to a pattern of landing in the mid-north region of the west coast in the Korean Peninsula, also moving from mainland China.
    Print ISSN: 1687-9309
    Electronic ISSN: 1687-9317
    Topics: Geosciences , Physics
    Published by Hindawi
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  • 6
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    Hard‐sphere radial distribution functions for face‐centered cubic and hexagonal close‐packed phases: Representation and use in a solid‐state perturbation theory (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-11-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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  • 7
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    The weakening of autumn drought intensity in Korea after late 1990s (2018)
    Co-Action Publishing
    Details
    Publication Date: 2018
    Description: Volume 70, Issue 1, December 2018, Page 1-17〈br/〉. 〈br/〉
    Print ISSN: 0280-6495
    Electronic ISSN: 1600-0870
    Topics: Geography , Geosciences , Physics
    Published by Co-Action Publishing on behalf of The International Meteorological Institute in Stockholm.
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  • 8
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    Anomalous variation in summer tropical cyclone activity by preceding winter Aleutian low oscillation (2017)
    Wiley
    Details
    Publication Date: 2017-05-20
    Description: This research found a high-positive correlation between Aleutian low oscillation during the winter (November–March) and tropical cyclone (TC) genesis frequency during the following summer (July–September) over a 26-year period (1982–2007). In the years with high Aleutian low oscillation, a number of characteristics were analyzed. In the preceding winter, anomalous pressure patterns, such as south-low and north-high at the low level, formed as the center for the regions near 20°N in the western North Pacific. Sea ice concentration was less than the average around the Sea of Okhotsk and the Bering Sea, which weakened the Aleutian Low in this area. This anomalous pressure pattern continued until the following summer, and it reinforced the anomalous easterlies at the mid-latitudes (20°–40°N) in East Asia and contributed to the high TC passage frequency in the East Asian continent. Relationships between Aleutian low index for preceding November–March (NDJFM) and tropical cyclone genesis frequency in the western North Pacific for (a) July, (b) August, (c) September, and (d) all 3 months. The correlation coefficients are significant at the 95% confidence level.
    Electronic ISSN: 1530-261X
    Topics: Geosciences , Physics
    Published by Wiley on behalf of The Royal Meteorological Society (RMetS).
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  • 9
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    Interdecadal variation of summer monsoon over the southern part of South Asia in mid-1990s (2017)
    Wiley
    Details
    Publication Date: 2017-05-04
    Description: ABSTRACT The time-series of South Asian summer monsoon index for 1974–2013 showed distinct interdecadal variation thereby revealing a characteristic of reduction in the index since 1994. Thus, this study analysed mean differences between 1995–2013 period and 1974–1994 period. In the difference in outgoing longwave radiation between the two periods, convection was strengthened in the Arabian Sea in the southern part of South Asia and was weakened in Indian subcontinent and the Indochina peninsula. In the difference in 850 hPa stream flows between the two periods, anomalous anticyclonic circulations extended from the western North Pacific to the Indian subcontinent via the Indochina Peninsula. Moreover, anomalous cyclonic circulations were strengthened in the western sea of Australia and anomalous warm southeasterlies that crossed the Equator from the circulations were headed towards the Arabian Sea. In the difference in 200 hPa stream flows between the two periods, the Arabian Sea was affected by anomalous cold northwesterlies. Thus, considering the circulations at the upper and lower troposphere, convection was weakened in recent years due to the effect of anomalous anticyclone over the regions from the western North Pacific via the Indochina Peninsula to the Indian subcontinent at the lower troposphere whereas convection was strengthened in the Arabian Sea due to the formation of vertical thermal instability. After defining land and sea areas in the west of the southern part of South Asia and land and sea areas in the east of the southern part of South Asia, differences between sensible heat flux in land area and sea surface temperature in sea area were analysed. A difference between land and sea areas in the west of the southern part South Asia was increased in the west of the southern part of South Asia since the mid-1990s whereas that in the east of the southern part of South Asia tended to be clearly decreased since the mid-1990s.
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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  • 10
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    Interdecadal variation of tropical cyclone genesis frequency in late season over the western North Pacific (2017)
    Wiley
    Details
    Publication Date: 2017-05-06
    Description: ABSTRACT This study analysed the time series of tropical cyclone (TC) frequency during October–December (OND) for 32 years (1980–2011). There was a strong decreasing trend of TCs until recently, and the TC sharply decreased from 1996 after the statistical change-point analysis was applied to this time series. To investigate the cause of such recent decrease in TC genesis frequency, the differences (TC activity and its relation to large-scale environments, and others) between the mean of the period from 1996 to 2011 and the mean of the period from 1980 to 1995 were analysed. TCs during the period 1996–2011 mainly occurred in the western region of tropical western North Pacific (TWNP), whereas during the 1980–1995 period they mainly occurred in the eastern region of TWNP. In the analysis of differences periods in the 850 hPa and 500 hPa stream flows between the two periods, an anomalous huge anticyclone existed from the north Pacific to the TWNP, and an anomalous huge cyclone existed to the west of 125°E including the East Asian continent. In other words, this is a typical low-west-high-east pressure system that appears in East Asia during summer, and this anomalous pressure system pattern caused the low TC genesis frequency during the 1996–2011 period. The low-west-high-east anomalous pressure system pattern which has been strengthened recently in East Asia suggests that the East Asian winter monsoon (EAWM) has weakened during the 1996–2011 period. As a result, the amount of snow depth decreased in many areas of the East Asian continent except for the North China and the ground heat net flux also increased in many areas. This weakening of the EAWM strengthened the anomalous huge anticyclone in the TWNP as well as in the central North Pacific, which caused the low TC genesis frequency during the OND in recent years. Time series of tropical cyclone (TC) genesis frequency in October–December (OND) (bar graph) and the result (dotted line) of statistical change-point analysis on TC genesis frequency. Solid, dashed and red lines denote averages of TC genesis frequency for 1980–1995 and for 1996–2011 and the trend of TC genesis frequency, respectively.
    Print ISSN: 0899-8418
    Electronic ISSN: 1097-0088
    Topics: Geosciences , Physics
    Published by Wiley
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