Periodic arrangements of tetrahedra having appearances similar to that of the Boerdijk-Coxeter helix.

The Boerdijk-Coxeter helix (BC helix or tetrahelix) is a linear stacking of regular tetrahedra. Although the BC helix exhibits an aperiodic nature, structures resembling the BC helix with periodicity are found in materials. To understand such structures, we considered a modification of the BC helix to introduce periodicity.

A case of endobronchial mucosa-associated lymphoid tissue (MALT) lymphoma successfully treated with radiotherapy and a review of the literature.

A 60-year-old man was noted to have an elevated lesion in the right mainstem bronchus on chest computed tomography (CT) during his annual medical checkup 3 years previously. The lesion had gradually increased in size. FDG-PET showed no accumulation.

Solitary fibrous tumor of the pineal region in the elderly: A case report.

Introduction: Solitary fibrous tumor (SFT) is a mesenchymal tumor with spindle cells that is often detected in the subcutaneous area and rarely in the central nervous system. Intracranial SFTs rarely occur in individuals older than 80 years, and there are only a few cases reports involving the pineal region.

Presentation Of Case: The present case was an 80-year-old man with lightheadedness, headache, and vomiting.

The application of an information support robot to reduce agitation in an older adult with Alzheimer's disease living alone in a community dwelling: a case study.

Objective/background: Agitation is a common behaviour of Alzheimer's Disease (AD). Although healing robots have previously been used for alleviating agitation for people with dementia in hospitals and other healthcare facilities, its effects remain unclear whether an information-support robot capable of disseminating information with user needs may have similar effects when it is applied in community dwellings. This study was to investigate the effects of information-support robots for reducing agitation in older people with AD residing alone in community-dwellings.

Description of Changes in Crystal Orientations by the Elements of Logarithm of a Rotation Matrix.

The logarithm ln⁡ of rotation matrix is a skew symmetric tensor consisting of three independent elements of real numbers. In addition to the Euler angles and the axis/angle pair, the elements of ln⁡ called the log angles are also the set of three parameters of . In this paper, we will show that the concept of the log angles is also useful to discuss changes in crystal orientations.