Singlet exciton fission allows the fast and efficient generation of two spin triplet states from one photoexcited singlet. It has the potential to improve organic photovoltaics, enabling efficient coupling to the blue to ultraviolet region of the solar spectrum to capture the energy generally lost as waste heat. However, many questions remain about the underlying fission mechanism. The relation...

In this preliminary scoping study, post-accident temperature transients of several fusion-fission designs utilizing ITER-FEAT-like parameters and fission pebble bed fuel technology are examined using a 1-D cylindrical Matlab heat transfer code along with conventional fission decay heat approximations. Scenarios studied include systems with no additional passive safety features to systems with m...

This paper presents an application of the Fusion-Fission method to the multi-way graph partitioning problem. The Fusion-Fission method was first designed to solve the normalized cut partitioning problem. Its application to the multi-way graph partitioning problem is very recent, thus the Fusion-Fission algorithm has not yet been optimized. Then, the Fusion-Fission algorithm is slower than the s...

Mitochondrial fission and fusion are linked to synaptic activity in healthy neurons and are implicated in the regulation of apoptotic cell death in many cell types. We developed fluorescence microscopy and computational strategies to directly measure mitochondrial fission and fusion frequencies and their effects on mitochondrial morphology in cultured neurons. We found that the rate of fission ...

Studies of transmutation of long-lived fission products by accelerator and by fission reactor at PNC are described. Four transmutation methods by accelerators are compared in terms of transmutation energy and transmutation rate. A super-powered electron linear accelerator which could transmute a large quantity of fission products has been studied and development of PNC test linac in this line i...

Singlet fission, a spin-allowed energy transfer process generating two triplet excitons from one singlet exciton, has the potential to dramatically increase the efficiency of organic solar cells. However, the dynamical mechanism of this phenomenon is not fully understood and a complete, microscopic theory of singlet fission is lacking. In this work, we assemble the components of a comprehensive...

The results of model calculations on nuclide yields produced by fission of excited U nuclei are presented. The calculation combines the modelling of the deexcitation process including the fission competition with the prediction of the nuclide production in the fission of excited U and all daughter nuclei produced in the evaporation cascade. The calculations are relevant for the design of future...

The results of model calculations on nuclide yields produced in selected scenarios using reactions with U nuclei are presented. The calculation combines the modelling of the initial reaction mechanism, the deexcitation process including the fission competition with the prediction of the nuclide production in the fission of excited U and all daughter nuclei produced in the evaporation cascade. T...

The fission rate during JCO criticality accident is estimated from fission-product (FP) radioactivities in a uranium solution sample taken from the preparation basin 20 days after the accident. The FP radioactivity data are taken from a report by JAERI released in the Accident Investigation Committee. The total fission number is found quite dependent on the FP radioactivities and estimated to b...

We use diamagnetic levitation to investigate the shapes and the stability of free electrically charged and spinning liquid drops of volume ∼1 ml. In addition to binary fission and Taylor cone-jet fission modes observed at low and high charge density, respectively, we also observe an unusual mode which appears to be a hybrid of the two. Measurements of the angular momentum required to fission a ...