Coupled oscillators play an important role in many scientific fields, for example, in mechanics, electronics, and biology; see [1, 4] and references therein. In this paper we analyze two coupled oscillators, one of which is driven by an external periodic force. Important example of such a system is a dynamic vibration absorber which consists of a small mass, m2, attached to the primary vibratin...

A 68-year-old female patient with a history of hyperlipidaemia and fatty liver was referred for evaluation of an incidentally detected asymptomatic cardiac mass. Computed tomographic scan imaging showed a large calcified mass in the left atrium. Echocardiography revealed a 2.4 1.5 cm, well-circumscribed, round, high echoic mass with severe calcification and low mobility attached to the lower ri...

A 67 year-old asymptomatic patient was referred to our echo-lab because of hypertension. Transthoracic 2D-echocardiogram showed a non-prolapsing ovoid mass attached to the left side of the interatrial septum. Transesophageal echocardiography evidenced an ovoid cavitated mass with internal areas of calcification. Color Doppler revealed flow inside the cavities. At surgery, a multicavitated mass ...

of scaling aggregate bandwidth by spreading partial functions over a number of disk processors. Object-level storage abstraction, introduced by NASD, is recognized to be the third alternative in addition to block-level storage abstraction typically seen in SAN storage environments and file-level storage abstraction in NAS storage environments. Content-Addressable Storage is another example whic...

0272-1732/00/$10.00  2000 IEEE The need to access anything from anywhere has increased the role of distributed file servers in computing. Distributed file systems provide local file system semantics for access to remote storage. This allows network clients to incorporate the remote storage into their local file system. File semantics are well understood by users and applications, making distri...

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statement of the problem: the routine procedure for immobilization of free gingival graft (fgg) is suturing. due to the successful application of tissue adhesives their employment has also become the subject of interest. purpose: the aim of present clinical trial was to compare using epiglu (e.g) versus silk thread suturing in fgg. materials and methods: this study was a split mouth clinical tr...

A case of extravesical malacoplakia, the first case in Japan, is described in detail. The patient was a 61-year-old woman with a right flank mass. Radiologically, the mass was thought to be of the renal origin. Surgically, however, the tumor was found attached not only to the cortical surface but extended to the retroperitoneum and psoas muscle. Pathological examination confirmed the lesion to ...

We report the case of a 69-year-old woman who was diagnosed with intracardiac schwannoma without symptoms. Preoperative echocardiography and cardiac magnetic resonance imaging showed a mass attached to the interatrial septum. The initial diagnosis was a myxoma or a bronchogenic cyst. The tumor was successfully excised under cardiopulmonary bypass. However, the pathology of the excised tumor was...

We discuss the classical motion of a spring of arbitrary mass coupled to two arbitrary massive blocks attached at its ends. A general approach to the problem is presented and some general results are obtained. Examples for which a simple elastic function can be inferred are discussed and the normal modes and normal frequencies obtained. An approximation procedure to the evaluation of the normel...