Design of a PXR experiment based on the NCEL

Abstract

Parametric X-ray Radiation (PXR) can be used as a novel, quasi-monochromatic energy-tunable and high-yield X-ray source. It is produced at the Bragg angle by a relativistic electron beam passing through the periodic structure of crystal materials. This article concerns the PXR experiment using low energy electrons (10 MeV) from NCEL (Novel Compact Electron–Linac). The difficulty of the experiment is to distinguish the PXR photons form the background. The design of the experiment relies mainly on the yield of PXR, the Bremsstrahlung background of the X-rays and the capability of the detector.

Study of Soil Structural Parameters Based on the Gunary Model

“…This work was financially supported by the 2013 National Science and Technology Support Program (2013BAJ06B00), Shanxi Provincial Science and Technology Co-ordination Innovation Project (2012KTDZD03-04). Thanks to the partial original data provided by reference [4].…”

“…XIE D Y summarizes the study results, and believes that the research method of micro-structure morphology, solid mechanics and soil mechanics are three basic ways of research on structural study of the soil, and he proposes a method to determine the soil strain considering structural parameter [2] . LUO Y S believes that the method to determine the soil strain considering parameter has many flaws under complex stress state, through the research of loess under dynamic, static stress state, proposes the method to determine the soil stress considering structural parameter [3] .CHEN X analyzes two typical methods about how to determine the soil structural parameter, and puts forward an expression with an unified form and simple style [4] .The value of soil structural parameter is determined by test data of undisturbed, remolded and saturated undisturbed soil samples. At present, there is more and more research on the soil structural parameter, there has been confined compression consolidation test, conventional triaxial compression test, and unsaturated soil triaxial compression test.…”

“…The application of a new model. This article will list Yan' an compacted Q 2 loess research achievements and quote partial reference [4] original date, the Gunary Model will be extended to the general soil stress-strain relationship description, and the details as shown in Fig. 3.…”

“…Test methods. Test soil samples are taken from Yang' ling, Shan' xi province, confined compression consolidation stress test will be controlled at 50kPa, 100kPa, 200kPa, 300kPa, 400kPa, including the same moisture content, dry density natural undisturbed soil samples, remodeled soil samples and natural saturated undisturbed samples [4] .…”