HVAC COOLING LOAD CALCULATIONS AND PRINCIPLES. Sensible Heat Gain â is the energy added to the space by conduction, convection and/or radiation. Latent Heat Gain â is the energy added to the space when moisture is added to the space by means of vapor.
Rise of USB. Developed by a consortium of companies made up of Intel, Compaq, Microsoft, Sony, DEC, IBM, and Northern Telecom, the Universal Serial Bus (USB) was introduced in January 1996. At that time, the USB 1.0 standard was capable of delivering a transfer rate of 12 Mbit/s. In April of 2000, USB 2.0 was introduced with a transfer rate of 480 Mbit/s. More recently, the USB 3.0 standard reaches transfer rates of 4.8 Gbit/s.
Mobile phones that offer these and more general computing capabilities are referred to as smartphones. The first hand-held cell phone was demonstrated by John F. Mitchell and Martin Cooper of Motorola in 1973, using a handset weighing around 4.4 pounds (2 kg).In 1983, the DynaTAC 8000x was the first to be commercially available.From 1983 to 2014, worldwide mobile phone subscriptions grew from zero to over 7 billion, penetrating 100% of the global population and reaching the bottom of the economic pyramid.ll mobile phones have a number of features in common, but manufacturers also seek product differentiation by adding functions to make them more attractive to consumers. This has led to great innovation in mobile phone development over the past 20 years.