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4篇 您的检索式：作者名="Pak Ronald"

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		题名	作者	年代	出处	被引量
	1	PML solution of longitudinal wave propagation in heterogeneous media显示文摘This paper describes the development of a model for unbounded heterogeneous domains with radiation damping produced by an unphysical wave absorbing layer. The Perfectly Matched Layer(PML) approach is used along with a displacement-based finite element. The heterogeneous model is validated using the closed-form solution of a benchmark problem: a free rod with two-part modulus subjected to a specified time history. Both elastically supported and unsupported semi-infinite rods with different degrees of inhomogeneity and loading are considered. Numerical results illustrate the effects of inhomogeneity on the response and are compared with those for equivalent homogeneous domains. The effects of characteristic features of the inhomogeneous problem, presence of local maxima and cut-off frequency are determined. A degenerate case of a homogeneous semi-infinite rod on elastic foundations is produced by tending the magnitude of the foundation stiffness to zero. The response of the latter is compared with that of a free rod. The importance of proper selection of the PML parameters to highly accurate and efficient results is demonstrated by example problems.	Farzanian M. Arbabi Freydoon Pak Ronald	2016	Earthquake Engineering and Engineering Vibration2016，15，2：	2
	2	Rational mechanical of axial soil-pile interaction显示文摘	Ronald Y S Pak Feng J	1993	Journal of Engineer Mechanics1993，119，4：	1
	3	Elastodynamic potential method for transversely isotropic solid 显示文摘	Mohammad Rahimian Morteza Eskandari-Ghadi Ronald Y S Pak	2007	Jour- nal of Engineering Mechanics-ASCE2007，133，：	1
	4	Avascular necrosis of the first metatarsal head in a young female adult:A case report and review of literature显示文摘BACKGROUND This case study describes an atypical presentation of avascular necrosis(AVN)of the first metatarsal head,which is largely unfounded in the literature.CASE SUMMARY A healthy 24-year-old female initially presented with pain at the first metatarsophalangeal joint(MTPJ)and was diagnosed with AVN by physical examination and magnetic resonance imaging.The patient demonstrated atypically poor progress in recovery,despite being in otherwise good health and being of young age,with no history of corticosteroid or alcohol use.The patient also did not have any history or clinical features of autoimmune disease or vasculitis,such as systemic lupus erythematosus.The patient was managed with conservative treatment for 18 mo,which allowed for gradual return of full range of motion of the first MTPJ and subsiding pain,permitting the patient to return to highintensity sports training and full weight-bearing.Throughout her recovery,many differential diagnoses were ruled out through specific investigations leading to further reinforcement of the diagnosis of AVN of the 1st metatarsal head.CONCLUSION Atypical AVN may occur with no predisposing risk factors.Treatment is mainly conservative,with unclear guidelines in literature on management.	Ronald Wing Hei Siu Jeremy Ho Pak Liu Gene Chi Wai Man Michael Tim Yun Ong Patrick Shu Hang Yung	2021	World Journal of Clinical Cases2021，9，25：	0

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