CMB-S4

We describe the stage 4 cosmic microwave background ground-based experiment CMB-S4

Transformational leadership: Analysis of gender leadership and perceptions of mandated school reform

The purpose of this study was to examine transformational leadership and the perceptions of male and female middle or junior high school principals and teachers regarding mandated school reform within the state of Indiana. One hundred and five schools were included in this research. Data were gathered from principals and teachers using the Multifactor Leadership Questionnaire (Form 5x-Short) developed by Bernard Bass and Bruce Avolio. Respondents were asked to complete a two-column survey based on leadership characteristics he or she perceived a principal ought to exhibit and leadership characteristics he or she perceived a principal actually exhibited. Three main hypotheses were identified to explore the perceptions of principals, teachers, and between four subgroups: male principals, female principals, male teachers, and female teachers. The first set of hypotheses explored transformational leadership characteristics the principal ought to exhibit. The second set of hypotheses characteristics the principal actually exhibits. The third set of hypotheses explored characteristics the principal actually exhibits compared to those the principal ought to exhibit. Ancillary questions explored issues of experience as well as knowledge and belief of mandated school reform. Gender, position, and the interaction between gender and position were examined. It was found that there were no significant differences in the perception of transformational leadership characteristics between male and female principals and male and female teachers. Gender did not have an effect on the perceptions of transformational leadership in regard to mandated school reform. There were significant differences in the perceptions of teachers and principals. Principals and teachers perceive the importance of transformational leadership. Principals, however, have higher expectations than teachers in regard to transformational leadership characteristics the principal ought to exhibit. The same is true for transformational leadership characteristics the principal actually exhibits and the transformational leadership characteristics the principal actually exhibits compared to what the principal ought to exhibit. Men and women principals have leadership styles specific to their gender but when exploring transformational leadership characteristics and mandated school reform there is no difference in gender perceptions. The attainment of effective leadership skills rather than the gender of the leader will help facilitate school improvement efforts

Multiple beam ptychography for large field-of-view, high throughput, quantitative phase contrast imaging

The ability to record large field-of-view images without a loss in spatial resolution is of crucial importance for imaging science. For most imaging techniques however, an increase in field-of-view comes at the cost of decreased resolution. Here we present a novel extension to ptychographic coherent diffractive imaging that permits simultaneous full-field imaging of multiple locations by illuminating the sample with spatially separated, interfering probes. This technique allows for large field-of-view imaging in amplitude and phase while maintaining diffraction-limited resolution, without an increase in collected data i.e. diffraction patterns acquired. (C) 2017 Elsevier B.V. All rights reserved

Multiple beam ptychography for high throughput data acquisition

We extend ptychography CDI to allow for imaging of multiple areas on a sample simultaneously using multiple identical beams. This enables high throughput imaging of large samples without increased data collection or loss in resolution

Spatial, spectral, and polarization multiplexed ptychography

We demonstrate ptychographic imaging of multiple areas of a sample simultaneously with no loss of resolution, by using different wavelengths or polarizations to collect independent diffraction patterns in parallel. This significantly reduces imaging times

Bibliography of North Sea regulations Volume 1; UK, EC Directives, international codes and guidance notes

Vol. 1 of 2 vols. References to regulations, codes and guidance notes on all aspects of offshore oil and gas activities in the north-west European areaAvailable from British Library Document Supply Centre- DSC:q94/24795 / BLDSC - British Library Document Supply CentreSIGLE6. edGBUnited Kingdo

Spatial, spectral, and polarization multiplexed ptychography

We introduce a novel coherent diffraction imaging technique based on ptychography that enables simultaneous full-field imaging of multiple, spatially separate, sample locations. This technique only requires that diffracted light from spatially separated sample sites be mutually incoherent at the detector, which can be achieved using multiple probes that are separated either by wavelength or by orthogonal polarization states. This approach enables spatially resolved polarization spectroscopy from a single ptychography scan, as well as allowing a larger field of view to be imaged without loss in spatial resolution. Further, we compare the numerical efficiency of the multi-mode ptychography algorithm with a single mode algorithm. (C) 2015 Optical Society of Americ

Multiple beam ptychography

We present an extension to ptychography that allows simultaneous deconvolution of multiple, spatially separate, illuminating probes. This enables an increased field of view and hence, an increase in imaging throughput, without increased exposure times. This technique can be used for any non-interfering probes: demonstrated with multiple wavelengths and orthogonal polarizations. The latter of which gives us spatially resolved polarization spectroscopy from a single scan

Multiple beam ptychography for large field of view imaging

We present an extension of ptychography coherent diffractive imaging that enables simultaneous imaging of several areas of an extended sample using multiple, spatially separated interfering beams. We show that this technique will increase the throughput of an imaging system by a factor that is equal to the number of beams used. This allows for the acquisition of large field of view images with near diffraction-limited resolution without an increase in data acquisition. This represents a significant step towards large field of view, high resolution imaging in the EUV and x-ray energy regimes

A room temperature polar magnetic metal

The emergence of long-range magnetic order in noncentrosymmetric compounds has stimulated interest in the possibility of exotic spin transport phenomena and topologically protected spin textures for applications in next-generation spintronics. Polar magnets, with broken symmetries of spatial inversion and time reversal, usually host chiral spin textures. This work reports on a wurtzite-structure polar magnetic metal, identified as AA′-stacked (Fe0.5Co0.5)5GeTe2, which exhibits a Néel-type skyrmion lattice as well as a Rashba-Edelstein effect at room temperature. Atomic resolution imaging of the structure reveals a structural transition as a function of Co-substitution, leading to the emergence of the polar phase at 50% Co. This discovery reveals an unprecedented layered polar magnetic system for investigating intriguing spin topologies, and it ushers in a promising new framework for spintronics