Willis couplings in continuously varying cross-sectional area duct.

Acoustic wave propagation in a one-dimensional periodic and asymmetric duct is studied theoretically and numerically to derive the effective properties. Closed form expressions for these effective properties, including the asymmetric Willis coupling, are derived through truncation of the Peano-Baker series expansion of the matricant (which links the state vectors at the two sides of the unit-cell) and Padé's approximation of the matrix exponential. The results of the first-order and second-order homogenization (with Willis coupling) procedures are compared with the numerical results.

Surface Love-type waves propagating through viscoelastic functionally graded media.

This paper deals with the solution of the model equations, which describes the propagation of the surface Love-type waves in a waveguide structure consisting of a lossy isotropic inhomogeneous layer placed on a viscoelastic homogeneous substrate. The paper points to the possibility of using the triconfluent Heun differential equation to solve the model equation. The exact analytical solution within the inhomogeneous layer is expressed by the triconfluent Heun functions.

Primary adenocarcinoma of the epididymis: the therapeutic role of retroperitoneal lymphadenectomy.

Aims: This case report describes a rare case of adenocarcinoma of the epididymis and the role of locoregional surgery in the therapeutic algorithm.

Clinical Case: We report a case of primary adenocarcinoma of the epididymis in a 61-year-old man who was primarily examined for nodular enlargement of the head of the epididymis. Retroperitoneal lymphadenectomy which the patient underwent after radical orchiectomy revealed lymph node metastases, subsequently he received adjuvant chemotherapy.

[Urgent thyroidectomy for a mechanical syndrome caused by a toxic nodular goiter--a case report].

We present a case of emergency surgery of an 86-year-old patient with an extensive cevicomediastinal toxic nodular goiter. Acutely onset mechanical syndrome during hospitalization of the patient in another department for a different diagnosis (vertebrogenic algic syndrome of Th-L spine) warranted acute intubation and mechanical ventilation. After the transfer of the patient to our department, we performed total thyroidectomy.

Analysis of tumor suppressor p53 status in head and neck squamous cell carcinoma.

Head and neck cancer belongs to the most common types of cancer in both males and females with a mortality rate of approximately 50%. More than 90% of head and neck cancers are squamous cell carcinoma (HNSCC). Carcinogenesis of this disease involves activation of proto-oncogenes and inactivation of tumor suppressor genes.