Coupling thermal subsystems on head-mounted displays

A multi-body augmented or virtual reality device is a head-mounted display whose constituent units can be flipped up, e.g., from over the eyes to over the forehead. In a multi-body AR/VR device, thermal problems associated with high processing power are exacerbated by the need to cool down each constituent unit. This disclosure describes techniques that achieve efficient thermal regulation in a multi-body wearable device by establishing a conductive or convective thermal path between the constituent units of the device. The techniques enable a flexible and ergonomic industrial design, and reduce duplicated componentry, weight and cost

Dynamic framerate adjustment

Presentation of content from a computer or other device on a large screen, such as a projector or a television, is a common activity. The computer is connected to the large screen via a wired or a wireless connection. The content to be presented can include documents and presentation slides with static content such as text and graphics, or content that includes motion such as videos. Default encoders that target high frame rates do not account for content type. The content of a document or slide may appear blurry or include undesirable artifacts if presented at a high frame rate. If the default encoder is configured with a low frame rate, videos may appear jerky and unpleasant to view. This disclosure describes techniques to select an appropriate content presentation mode that targets a suitable frame rate. The selection is based on encoder statistics, e.g., the percentage of blocks that change in successive frames of the video content from the computer. The selected mode uses a suitable framerate based on the type of content for display on the large screen

Observations on muon multiplicity distribution with the GRAPES-2 experiment at Ooty for studies on the mass composition of cosmic rays at PeV energies

Precise knowledge of the mass composition of the primary cosmic ray flux below and above the knee in the primary energy spectrum at E∼3×1015 eV is essential for understanding the acceleration and propagation of high energy cosmic rays. Simulations have shown that the correlations between the electron and muon components of showers are very sensitive to the mass of the primary nuclei. In particular, different regions of the muon multiplicity distribution observed with a large area muon detector, for well-defined selection on the electron component of showers, have a high sensitivity to different nuclear groups present in the primary flux. The GRAPES-2 experiment at Ooty seeks to exploit this sensitivity using a 200m2 area muon detector to study the mass composition of the primary flux in the energy range 1014-1016 eV. The details of the experiment are presented and early observations are discussed in relation to the expectations from simulations