In the current research, we present the results from a growth detection study in young forest and mature pine-dominated forest located on poor sites. Canopy height distributions were created from small-footprint airborne laser scanner data collected over 87 georeferenced field sample plots. The size of each plot was 300-400 m. The laser data were acquired in 1999 and 2001, and none of the plots...

In this paper, we present a neutron spectrum unfolding technique based on a modification of the least-squares method. The main innovation is the use of a Krylov subspace iteration method to solve the least-squares normal equations. This method was employed because it performs better on ill-conditioned systems of linear equations as compared with standard direct-solution methods. Three different...

The response of a la rge-crystal sodium-iodide spectrometer was studied fo[' individual monoenergetic electrons extracted from a 50-million-electron-volt betatron operatcd between 1 a nd 20 Mev. The energy resolut ion with crystals 5 inches in diameter by 4 inches in length a nd 5 inches in diameter by 9 inches in length reaches its optimum value fo r electrons of 6 Mev where t he total width o...

Fast and accurate identification of neutron sources is very important in nuclear nonproliferation and international safeguards applications. Commonly, the identification of neutron spectra relies on unfolding procedures, which requires the solution of an ill-posed problem. In this paper, we present a new application of an existing technique, which can be used for neutron source identification w...

The variation of the detection efficiency of electron multipliers used in the pulse-counting mode is investigated as a function of the average gain per dynode, the energy of the electrons being detected and the applied voltage. It is assumed that the pulse-height distributions can be obtained from Polya statistics and that the universal yield curve for secondary emission is applicable. Results ...

Watt’s bath and pulse reverse (PR) electrodeposition is used to produce spherical nickelmultiwall carbon nanotubes (Ni-MWCNT) of 2.00, 0.93, 1.63 and 6.71 μm diameter and a variety ofsize distributions. For 60 cycles, an absolute electrodeposition current of 18 A/dm2 is applied atcurrent ratios of ii = idissolution/ideposition = 0, 0.077, 0.200 and 0.368. A simple exponential equation isfitted ...

A novel method was developed to separate the 238 U fission contribution measured in quasi-differential time-of-flight scattering experiments order isolate elastic and inelastic events. Pulse height distributions from in-beam measurements were used generate response functions, which reconstruct prompt neutron spectra. This validated by reconstructing 252 Cf spontaneous pulse distribution. Monte ...