Gravitational Wave Hotspots: Ranking Potential Locations of Single-Source Gravitational Wave Emission

The steadily improving sensitivity of pulsar timing arrays (PTAs) suggests that gravitational waves (GWs) from supermassive black hole binary (SMBHB) systems in the nearby universe will be de- tectable sometime during the next decade. Currently, PTAs assume an equal probability of detection from every sky position, but as evidence grows for a non-isotropic distribution of sources, is there a most likely sky position for a detectable single source of GWs? In this paper, a collection of galactic catalogs is used to calculate various metrics related to the detectability of a single GW source resolv- able above a GW background, assuming that every galaxy has the same probability of containing a SMBHB. Our analyses of these data reveal small probabilities that one of these sources is currently in the PTA band, but as sensitivity is improved regions of consistent probability density are found in predictable locations, specifically around local galaxy clusters.Comment: 9 pages, 9 figures, accepted for submission in Ap

Direct measurement of the flow field around swimming microorganisms

Swimming microorganisms create flows that influence their mutual interactions and modify the rheology of their suspensions. While extensively studied theoretically, these flows have not been measured in detail around any freely-swimming microorganism. We report such measurements for the microphytes Volvox carteri and Chlamydomonas reinhardtii. The minute ~0.3% density excess of V. carteri over water leads to a strongly dominant Stokeslet contribution, with the widely-assumed stresslet flow only a correction to the subleading source dipole term. This implies that suspensions of V. carteri have features similar to suspensions of sedimenting particles. The flow in the region around C. reinhardtii where significant hydrodynamic interaction is likely to occur differs qualitatively from a "puller" stresslet, and can be described by a simple three-Stokeslet model.Comment: 4 pages, 4 figures, accepted for publication in PR

Persepsi Penghuni terhadap Kenyamanan Beraktivitas di Ruang Terbuka Perumahan

A comfort open space has a function and a huge influence in housing because it becomes a means of activity throughout the housing dwellers. Debang Housing Taman Sari Medan is one of housing in Kecamatan Medan Selayang which has open space. The purpose of this research is to know the perception of occupant to the comfort of open space. There are several convenience factors that are used as indicators in research such as Circulation, Climate, Noise, Smell, Shape, Safety, Cleanliness, and Beauty. The research was done through qualitative descriptive analysis, where the data collection technique used questionnaire from the population and the specified sample. The process of collecting data, sampling technique until the criteria of research become an important process of research method. This study shows if the perception of occupants of the comfort of open space of housing Debang Taman Sari Medan is quite comfortable and needed supporting facilities for park users

Creating a Safety Net to Increase College Completion

This GrantCraft case study, developed for Candid's scholarshipsforchange.org portal, explores Ascendium Education Group's emergency grant program that helps students complete college. With five decades of experience providing student loans, Ascendium launched its philanthropy program designed to increase college access and completion for low-income populations and underrepresented groups. The case study explores how Ascendium implemented and scaled their direct support

Improving Healthcare by Investing in the Future of Nursing

This GrantCraft case study, developed for Candid's scholarshipsforchange.org portal, explores Jonas Philanthropies investments in the futures of nurses. In 2008, Barbara and Donald Jonas decided to focus their philanthropy on nursing education leadership at the doctoral level through the Jonas Scholars program.

Transforming America Through Community Engagement

This GrantCraft case study, developed for Candid's scholarshipsforchange.org portal, explores the Bonner Foundation's  Bonner program—a service-based scholarship program. The scholarship targets high financial need students and affords them the opportunity to serve their community during college and through internships. This case study explores how the Bonner program was designed and the impact it has created

A Continent of Change

This GrantCraft case study, developed for Candid's scholarshipsforchange.org portal, explores Mastercard Foundation's Scholarship program which supports students across Africa. Working with partner organizations, the foundation provides access to secondary education and higher education for young Africans who have demonstrated leadership potential and a commitment to serving their communities.

A Regional Approach to Prosperity for All

This GrantCraft case study, developed for Candid's scholarshipsforchange.org portal, explores how Kauffman Foundation implemented the Kauffman Scholars program to increase college completion for students in Kansas City, Missouri. It includes the perspective on how the foundation transitioned its strategy and included an emphasis on career-readiness and family support to help students persist through challenges and reach their goals