This paper reviews the relative merits of Si, GaAs, SiC, and GaN materials and describes how the attributes of each impact the operation of microwave transistors for the generation of high RF output power, on the order of hundreds to thousands of watts, as necessary for radars systems. It is shown that the superior physical attributes of GaN lead to microwave transistors that are extremely well...

We present the first high-resolution rotational spectrum of an artificial molecular rotary motor. By combining chirped-pulse Fourier transform microwave spectroscopy and supersonic expansions, we captured the vibronic ground-state conformation of a second-generation motor based on chiral, overcrowded alkenes. The rotational constants were accurately determined by fitting more than 200 rotationa...

Hydrogen and carbon nanotubes (CNTs) were produced by generating plasma in an organic solvent. The 2.45GHz microwave in-liquid plasma is generated by using a conventional microwave oven. The hydrogen generation efficiency using the in-plasma method is approximately 34% that of the electrolysis of water. When cyclohexane is used as the source liquid, multi-walled carbon nanotubes (MWCNTs) having...

Worldwide efforts are being made to increase the use of renewable energy in order to reduce the emission of greenhouse gases. Africa is blessed with abundant resources of fossil fuels as well as renewable energy resources. Yet the continent, especially sub-Saharan Africa, is afflicted with power crisis. For example, in Nigeria, erratic electricity supplies will persist unless the government div...

Frequency references are indispensable to radio, microwave and time keeping systems, with far reaching applications in navigation, communication, remote sensing and basic science. Over the past decade, there has been an optical revolution in time keeping and microwave generation that promises to ultimately impact all of these areas. Indeed, the most precise clocks and lowest noise microwave sig...

We show that a non-quasiparticle charge collective mode, in parallel and coincident with the d-wave pair conductivity, leads to a quantitative understanding of microwave surface impedance measurements on superconducting Bi2Sr2CaCu2O8+δ. The analysis suggests an inhomogeneous charge ground state in Bi2Sr2CaCu2O8+δ and other HTS. A complete understanding of the microwave response of high Tc super...