The Salvation Army has urgently appealed for donations after it suffered a 50 per cent reduction in fundraising compared with last year at a time when the need is “greater than ever”. Captain Dennis ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...

Optical materials and structures are substances used to manipulate the flow of light. This can include reflecting, absorbing, focusing or splitting an optical beam. The efficiency of a specific ...