Notepad Corner

Most criminals are opportunists who will take advantage of any gaps in your home and business security. If your property looks secure they will in most cases move on to somewhere that looks more promising. A left open back gate, or bathroom window can be an invitation for someone to chance their luck. Back gardens are a common point of entry for many criminals. They often have unsecured access and can open out onto back lanes, shared passageways or open ground. They can provide quick escape routes for criminals as well as cover and shelter. So, it stands to reason that if you have a  garden security you go a long way towards securing your property overall. What can you do to help reduce the risk of crime occurring via your back garden? Motion Sensitive Lights One of the easiest ways to be alerted to the presence of an intruder in your garden is to install motion sensitive lights. These are lights that are connected to a motion detector and contain small ‘electronic eyes’ ...

In scanning electron microscopy (SEM), a beam of electrons scans the surface of a specimen, providing detailed, magnified images. This is different to optical microscopy , which involves viewing objects through a magnified lens using visible light. Electron microscopy has certain advantages over optical microscopy. How Do Electron Microscopes Work? Using electron beams, an electron microscope can give a very high quality of imaging, as an advanced means of sample analysis. In SEM, an electron gun fires an electron beam which is focussed through a series of lenses and apertures on the microscope. When these beams hit the sample, they interact with atoms on its surface, emitting secondary electrons, backscattered electrons, and x-rays. The microscope has built-in detectors that pick up these signals, using them to create high-resolution images and provide information on the composition of the specimen. The SEM operates under vacuum conditions, which prevents atoms or mo...