Virtual and Real-Time Synchronous Interaction for Playing Table Tennis with Holograms in Mixed Reality.

Real-time and accurate interaction technology is required to realize new wearable Mixed Reality (MR) solutions. At present, the mainstream interaction method relies on gesture detection technology, which has two shortcomings: 1. the hand feature points may easily be obstructed by obstacles and cannot be detected and 2.

Severe trachea compression caused by Riedel's thyroiditis: A case report and review of the literature.

Background: Riedel's thyroiditis (RT) is a rare form of chronic thyroiditis, associated with fibroinflammatory process involving the thyroid and surrounding cervical tissues, leading to compressive symptoms.

Case Presentation: We present a case of RT in a 73-year-old female with dyspnoea caused by severe trachea compression. She had reported dyspnoea during physical stress, and had noticed a large mass on the front of the neck.

Surgical approach and technique in retrosternal goiter: Case report and review of the literature.

Background: Retrosternal goiter is defined as a thyroid mass of which more than 50% is located below the thoracic inlet. The aim of this study is to assess the retrosternal goiter surgically approach through a neck incision and analyze the surgical technique.

Case Presentation: The case reported by us used a single neck collar-shaped incision for huge retrosternal goiter with good outcome.

Analysis of steady ground water flow toward wells in a confined-unconfined aquifer.

A confined aquifer may become unconfined near the pumping wells when the water level falls below the confining unit in the case where the pumping rate is great and the excess hydraulic head over the top of the aquifer is small. Girinskii's potential function is applied to analyze the steady ground water flow induced by pumping wells with a constant-head boundary in a mixed confined-unconfined aquifer. The solution of the single-well problem is derived, and the critical radial distance at which the flow changes from confined to unconfined condition is obtained.