Wide acceptance angle, high concentration ratio, optical collector

A cassegrain optical system provides improved collection of off-axis light yet is still characterized by a high concentration ratio. The optical system includes a primary mirror for collecting incoming light and reflecting the light to a secondary mirror which, in turn, reflects the light to a solar cell or other radiation collection device. The primary mirror reflects incoming on-axis light onto an annular section of the secondary mirror and results in the reflection of a substantial amount of incoming off-axis light onto the remainder of the secondary mirror. Thus light which would otherwise be lost to the system will be captured by the collector. Furthermore, the off-axis sections of the secondary mirror may be of a different geometrical shape than the on-axis annular section so as to optimize the amount of off-axis light collected

Large area pulsed solar simulator

An advanced solar simulator illuminates the surface a very large solar array, such as one twenty feet by twenty feet in area, from a distance of about twenty-six feet with an essentially uniform intensity field of pulsed light of an intensity of one AMO, enabling the solar array to be efficiently tested with light that emulates the sun. Light modifiers sculpt a portion of the light generated by an electrically powered high power Xenon lamp and together with direct light from the lamp provide uniform intensity illumination throughout the solar array, compensating for the square law and cosine law reduction in direct light intensity, particularly at the corner locations of the array. At any location within the array the sum of the direct light and reflected light is essentially constant

Characterization of DNA-binding proteins as clinically relevant biomarkers of breast cancer behavior.

While investigating estrogen response element (ERE) binding properties of Era in de-identified human breast cancer extracts, additional proteins were observed that recognized ERE sequences (ERE-BP). In order to unravel the apparent role of these proteins, our goal was to compare properties of these novel ERE-BP with those of ERa, determine their identity and evaluate their clinical relevance in breast cancer behavior. ERE-BP were present in various tissue types including breast, ovarian, uterine and colon cancers and normal tissues. These proteins were present in both cytoplasm and nuclei although higher binding activities were detected in nuclear extracts. ERE-BP did not supershift with numerous anti-ERa or ERß antibodies recognizing different ER epitopes suggesting that they are not fragments of either ERa or ERß. ERE-BP competed with rhERa for binding to the VitA2-ERE yet overall exhibited significantly different sequence specificity compared to that of human ERa. The ERE-BP we observed in breast cancer extracts were not specific for ERE sequences. To further support this conclusion, various estrogens had no effect on the ERE-binding of these proteins in contrast to rhERa. Furthermore, ERE-BP activities were not correlated with levels of expression of in either ERa- or ERE-mediated transcription. An immune-based method was established for purifying ERE-BP from tissue extracts and proteins were identified by mass spectrometry. Ku70 (XRCC6) and Ku80 (XRCC5) were determined to be the most likely candidates for the identity of ERE-BP. Supershift assays confirmed that ERE-BP/ERE complexes observed by EMSA were specifically recognized by antibodies to the Ku70/Ku80 heterodimer (Ku). Western blotting with Ku70/Ku80 antibodies confirmed their presence in breast cancer extracts. Increased Ku DNA-binding activities in cytosols of breast biopsies correlated with higher grade tumors, positive lymph node status and decreased patient survival. Also increased Ku DNA-binding activities in cancers from patients receiving adjuvant chemotherapy correlated with decreased survival, suggesting Ku DNA-binding activities may be used to predict response to treatment. Collectively, our results suggest that Ku DNA-binding activities in cytosols prepared from carcinoma biopsies are useful biomarkers for assessing breast cancer recurrence and response to therapy

Scarring of Florida’s seagrasses: assessment and management options

Management programs that address scarring of seagrasses should be based on an approach that involves (1) education, (2) channel marking, (3) increased enforcement, and (4) limited-motoring zones. Aerial monitoring and photography of the managed area are essential in evaluating the effectiveness of a program. Management programs that use this multifaceted approach have been instituted by a few local governments and at several state parks. Initial results of the programs indicate that in some areas seagrass scarring has been reduced but that in other areas emphasis may need to be increased on one or more of the components of the four-point approach. A statewide management plan is needed to address the most egregious scarring over large areas that may be difficult to regulate at the local-government level

Design, fabrication and delivery of a miniature Cassegrainian concentrator solar array system

The optical design of the miniature Cassegrainian concentrator (MCC) element was improved for both offpoint and onpoint power capability. The cell stack design has shown no losses under the high short term thermal stresses imposed by component level test and is projected to be capable of greater than five years thermal cycle life in low Earth orbit. The structural design met all requirements for stiffness and flatness and requires adjustable inserts for fine tuning of the GFRP structure to meet flatness goals. The completed, fully populated small and large MCC panels deliverable under this contract perform electrically as expected. A solid acceptance inspection program to guarantee quality of all purchased parts, and continued manufacturing process improvements will make the MCC design a viable low cost alternative to standard flat panel technology. Minor improvements to the cell stack design of the MCC element can make significant improvements in both the performance and manufacturability of the MCC system

Wigner-Moyal description of free variable mass Klein-Gordon fields

A system of coupled kinetic transport equations for the Wigner distributions of a free variable mass Klein-Gordon field is derived. This set of equations is formally equivalent to the full wave equation for electromagnetic waves in nonlinear dispersive media, thus allowing for the description of broadband radiation-matter interactions and the associated instabilities. The standard results for the classical wave action are recovered in the short wavelength limit of the generalized Wigner-Moyal formalism for the wave equation.Comment: 9 pages, accepted for publication in Journal of Mathematical Physic

Kinetic-Ion Simulations Addressing Whether Ion Trapping Inflates Stimulated Brillouin Backscattering Reflectivities

An investigation of the possible inflation of stimulated Brillouin backscattering (SBS) due to ion kinetic effects is presented using electromagnetic particle simulations and integrations of three-wave coupled-mode equations with linear and nonlinear models of the nonlinear ion physics. Electrostatic simulations of linear ion Landau damping in an ion acoustic wave, nonlinear reduction of damping due to ion trapping, and nonlinear frequency shifts due to ion trapping establish a baseline for modeling the electromagnetic SBS simulations. Systematic scans of the laser intensity have been undertaken with both one-dimensional particle simulations and coupled-mode-equations integrations, and two values of the electron-to-ion temperature ratio (to vary the linear ion Landau damping) are considered. Three of the four intensity scans have evidence of SBS inflation as determined by observing more reflectivity in the particle simulations than in the corresponding three-wave mode-coupling integrations with a linear ion-wave model, and the particle simulations show evidence of ion trapping.Comment: 56 pages, 20 figure

Spin contribution to the ponderomotive force in a plasma

The concept of a ponderomotive force due to the intrinsic spin of electrons is developed. An expression containing both the classical as well as the spin-induced ponderomotive force is derived. The results are used to demonstrate that an electromagnetic pulse can induce a spin-polarized plasma. Furthermore, it is shown that for certain parameters, the nonlinear back-reaction on the electromagnetic pulse from the spin magnetization current can be larger than that from the classical free current. Suitable parameter values for a direct test of this effect are presented.Comment: 4 pages, 2 figures, version accepted for publication in Physical Review Letter

Experiences of Counselors who Provide Services to African American Men with Repeated Domestic Violence Abuse Reports

Domestic violence has been a major concern in the United States. To effectively work with domestic violence offenders, counselors must have the skills and knowledge needed. The purpose of this qualitative phenomenological study was to understand lived experiences of counselors who provide in-home counseling services to African American men who are repeat domestic violence offenders and received a subsequent abuse report within 6 months after in-home services were discontinued. The goal was to try to develop an understanding of experiences of counselors who provide services to these men. Interviews were used to collect data. I used Otter to transcribe all the interviews. I analyzed the data utilizing note taking and reviewing of the interviews. Seven themes emerged from interviews with the eight participants: victims are reluctant to leave their perpetrators, counselors do not have adequate in-services training to work with this population, there are not enough alternatives for victims so victims are afraid of the unknown and of starting over, counselors believe that perpetrators are not being held accountable for their actions and that the victims are the ones being punished, there are not enough resources available to better serve this population, counselors are not prepared in their master’s degree programs to work with this population, and counselors feel that victims sometimes are also responsible for domestic violence. The results of this study could be used to help counselor educators to have a better understanding of the use of intensive in-home services in order to be able to provide services that are individualized to meet the needs of clients

Plasma density measurements using chirped pulse broad-band Raman amplification

Stimulated Raman backscattering is used as a non-destructive method to determine the density of plasma media at localized positions in space and time. By colliding two counter-propagating, ultra-short laser pulses with a spectral bandwidth larger than twice the plasma frequency, amplification occurs at the Stokes wavelengths, which results in regions of gain and loss separated by twice the plasma frequency, from which the plasma density can be deduced. By varying the relative delay between the laser pulses, and therefore the position and timing of the interaction, the spatio-temporal distribution of the plasma density can be mapped out