Thomson scattering in high intensity regime

The subject of this paper is the scattering of a very intense laser pulse (intensity $I\sim10^{21}\;{\mathrm{W/cm^2}}$) on relativistic electrons with Lorentz factor between 10 and 45. The laser pulse is modeled by a plane wave with finite length and the calculations are performed within the framework of the classical electrodynamics, which is valid for the field intensity and range of electron energies we consider. For a pulse with the central wavelength $\lambda=1060\;{\mathrm{nm}}$ and circular polarization, we study systematically the angular distribution of the emitted radiation, $dW/d\Omega$, in its dependence on the electron energy for two collision geometries: the head-on collision (counterpropagating electron and laser pulse), and the 90 degrees collision (the initial electron momentum orthogonal to the laser propagation direction). We investigate the relation between $dW/d\Omega$ and the trajectory followed by the electron velocity during the laser pulse and, for the case of a short laser pulse, we discuss the carrier-envelope phase effects. We also present, for the two mentioned geometries, an analysis of the polarization of the emitted radiation and a comparison of the results predicted by the exact classical formula with a high-energy approximation of it

Solar Arrays for Low-Irradiance Low-Temperature and High-Radiation Environments

This is the Base Period final report DRAFT for the JPL task 'Solar Arrays for Low-Irradiance Low-Temperature and High-Radiation Environments', under Task Plan 77-16518 TA # 21, for NASA's Extreme Environments Solar Power (EESP) project. This report covers the Base period of performance, 7/18/2016 through 5/2/2017.The goal of this project is to develop an ultra-high efficiency lightweight scalable solar array technology for low irradiance, low temperature and high-radiation (LILT/Rad) environments. The benefit this technology will bring to flight systems is a greater than 20 reduction in solar array surface area, and a six-fold reduction in solar array mass and volume. The EESP project objectives are summarized in the 'NRA Goal' column of Table 1. Throughout this report, low irradiance low temperature (LILT) refers to 5AU -125 C test conditions; beginning of life (BOL) refers to the cell state prior to radiation exposure; and end of life (EOL) refers to the test article condition after exposure to a radiation dose of 4e15 1MeV e(-)/cm(exp 2)

Progress in cavity QED with single trapped atoms

We report on recent progress in our lab involving cavity quantum electrodynamics with optically trapped atoms. In particular, we will focus on a recent measurement of the Vacuum-Rabi splitting for one atom strongly coupled to the field of a high finesse optical resonator. This splitting is characteristic of the normal modes in the eigenvalue spectrum of the atom-cavity system. A new Raman scheme for cooling atomic motion along the cavity axis enables a complete spectrum to be recorded for an individual atom trapped within the cavity mode, in contrast to all previous measurements in cavity QED that have required averaging over many atoms

Comparative study regarding agility between u18 and u16 handball players from university sports club of Suceava

The purpose of this study was to evaluate the agility and the running speed of male handball players in Category Junior Team of University Sports Club of Suceava and then make the comparasion between the results obtained by players from U16 and those from U18. The sample of participants consisted of 32 male junior handball players, divided into two groups: 18 handball players U16 (age 15.27±0.57 years), and 14 handball players U18 (age 17.14±0.77). To test agility we used Illinois Test that involves various turns and movements. At the end of the research, it was shown that there were no significant differences calculated between under 18 and under 16 handball junior players in agility (p =.38). Even if there was a difference between arithmetic means (17.49±1.52; 17.08±0.97), that was not statistically significant

Intake of Probiotic and Prebiotic Foods in Psoriasis Patients: A Case-Control Study in Romania

Psoriasis is a chronic, inflammatory skin disease which highly impacts the quality of life of psoriatic patients. Although the pathogenesis of psoriasis is multifactorial, recent evidence suggest that alterations in the intestinal microbiome play an important role suggesting a clear status of dysbiosis associated with the disease. This study aimed to assess the frequency of probiotic and prebiotic food consumption in psoriasis patients in Romania (n = 122), with an emphasis on potential dietary risk or protective factors linked with psoriasis. The results showed that consuming fermented and probiotic foods, such as fermented dairy products, kombucha, whole grains, fruits, and vegetables, may have an essential role in limiting or alleviating psoriasis symptoms. Future research should also investigate this relationship, considering other food groups, such as fish, meat, and fats, using a national validated food frequency questionnaire

GaInP/GaAs dual junction solar cells on Ge/Si epitaxial templates

In this study, we report synthesis of large area (> 2 cm^2) crack-free GaInP/GaAs double junction solar cells on 50 mm diameter Ge/Si templates fabricated using wafer bonding and ion implantation induced layer transfer techniques. Defect removal from the template film and film surface prior to epitaxial growth was found to be critical to achievement of high open circuit voltage and efficiency. Cells grown on templates prepared with chemical mechanical polishing in addition a wet chemical etch show comparable performance to control devices grown on bulk Ge substrates. Current-voltage (I–V) data under AM 1.5 illumination indicate that the short circuit current is comparable in templated and control cells, but the open circuit voltage is slightly lower (2.08V vs. 2.16V). Spectral response measurements indicate a drop in open circuit voltage due to a slight lowering of the top GaInP cell band gap. The drop in band gap is due to a difference in the indium composition in the two samples caused by the different miscut (9° vs. 6°) of the two kinds of substrates

Experiments in Cavity QED: Exploring the Interaction of Quantized Light with a Single Trapped Atom

The experiments discussed in this thesis focus on the interaction of a single trapped atom with the single mode of a high-finesse optical cavity, in the regime of strong coupling. Chapter 1 gives a brief introduction, after which Chapter 2 describes our recent measurements of the transmission spectrum of the atom-cavity system. The spectrum exhibits a clearly resolved vacuum-Rabi splitting, in good quantitative agreement with theoretical predictions. A new Raman scheme for cooling atomic motion along the cavity axis enables a complete spectrum to be recorded for an individual atom trapped within the cavity mode, in contrast to all previous measurements of this type that have required averaging over 10^3-10^5 atoms. Chapter 3 discusses our observations of photon blockade for the transmitted light in the presence of one trapped atom. Excitation of the atom-cavity system by a first photon blocks the transmission of a second one, thereby converting an incident Poissonian stream of photons into a sub-Poissonian, anti-bunched stream, as confirmed by measurements of the photon statistics of the transmitted field. The intensity correlations of the cavity transmission also reveal the energy distribution for oscillatory motion of the trapped atom. Chapter 4 details a set of simple but necessary measurements of relevant experimental parameters such as cavity geometry, linewidth, mirror properties, birefringence, and detection efficiency. The thesis concludes with Appendix A, describing the efficient laser setup we use for our magneto-optical traps.</p