1. The common-base emitter current In hot-electron transistors, the emitter/base junction should allow the injection of electrons into the graphene base. The emitter current is the source of all the electrons injected into the graphene base and it consists of two components: one component is due to Fowler-Nordheim tunneling, and the other component is due to thermionic emission (e.g. the curren...

Abstract We perform simulation study for a 10-kg $$^{100}$$ 100 Mo-based bolometeric demonstration experiment neutrinoless double-beta decay ( $$0\nu \beta $$ 0 ν β ) search at China JinPing undergrou...

Cerenkov counting is a convenient and effective method of high-energy beta radiation, which has long been used to measure number radionuclides, such as, in particular, 90Sr+90Y, environmental objects. The traditional requires the use radiochemical sample preparation procedures, but these procedures may be simpler than those used, for example, liquid scintillation (LSC) method. We proposed Ceren...

Positron emission particle tracking measures the trajectory of a single radioactively labelled tracer by coincident detection emitted annihilation photons. The technique enables non-invasive study dense opaque flows, with acting as small neutrally buoyant flow-follower. University Cape Town has established PEPT facility at iThemba LABS, utilising particles produced through radiochemical methods...

This paper aims to improve qualitative understanding of electrostatic influences on apex field enhancement factors (AFEFs) for small field emitter arrays/clusters. Using the "floating sphere at emitter-plate potential" (FSEPP) model, it re-examines the electrostatics and mathematics of three simple systems of identical post-like emitters. For the isolated emitter, various approaches are noted. ...

Upconversion is the observation of high energy photon emission from low energy photon absorption. 1 Among the multiple upconversion mechanisms, one that has drawn recent interest is triplet-triplet annihilation (TTA). TTA holds significant advantages over its upconversion counterparts including its use of simple, tunable molecules and its ability to operate under low intensity, non-coherent lig...

One constraint of semiconducting polymer dots (Pdots), especially those with near-IR emission, is their low effective emitter ratio ( 1.5 mole percent), which limits their pH sensing performance. The other critical issue of existing Pdot-based pH sensors is their poor photostability. To address these issues, we developed a series of Pdots by dendronizing the squaraine-based pH responsive near-I...

In this paper we explore theory, design, and fabrication of photonic crystal (PhC) based selective thermal emitters. In particular, we focus on tailoring spectral and spatial properties by means of resonant enhancement in PhC’s. Firstly, we explore narrow-band resonant thermal emission in photonic crystals exhibiting strong spectral and directional selectivity. We demonstrate two interesting de...