The Pennsylvania Dutchman Vol. 8, No. 4

● Such Fancy Boxes, Yet ● Dried Corn ● Pennsylvania Dutch Cooking is Corny ● The Amish at Play ● Colonial Button Mold ● Illness and Cure of Domestic Animals Among the Pennsylvania Dutch ● Pennsylvania Dutch Pioneershttps://digitalcommons.ursinus.edu/dutchmanmag/1011/thumbnail.jp

Pennsylvania Folklife Vol. 11, No. 2

• Walter Ellsworth Boyer (1911-1960) • The Meaning of Human Figures in Pennsylvania Dutch Folk Art • Meadow Irrigation in Pennsylvania • Receipt Books-New and Old • Pennsylvania Cave and Ground Cellars • The Amish in Their One-Room Schoolhouses • Collectaneahttps://digitalcommons.ursinus.edu/pafolklifemag/1007/thumbnail.jp

Pennsylvania Folklife Vol. 46, No. 3

• Two Worlds in the Dutch Country • Belsnickel Lore • Carpet-Rag Parties • Quilting Traditions in the Dutch Country • Lititz • Lititz Specialties • Amish Funerals • Pennsylvania Redware • Scratch-Carved Easter Eggs • Fractur From the Hostetter Collectionhttps://digitalcommons.ursinus.edu/pafolklifemag/1149/thumbnail.jp

Pennsylvania Folklife Special 1960 Festival Issue

• Plain Dutch and Gay Dutch: Two Worlds in the Dutch Country • Pennsylvania Dutch • Displaced Dutchmen Crave Shoo-flies • Hex Signs: A Myth • Lebanon Valley Date Stones • Antiques in Dutchland • Antique or Folk Art: Which? • Folk Festival Program • Religious Patterns of the Dutch Country • The Costumes of the Plain Dutch • Love Feasts • Horse-and-Buggy Mennonites • The Courtship and Wedding Practices of the Old Order Amishhttps://digitalcommons.ursinus.edu/pafolklifemag/1008/thumbnail.jp

Pennsylvania Folklife Vol. 9, No. 2

• Barracks • The Courtship and Wedding Practices of the Old Order Amish • Rufus A. Grider • Knife, Fork and Spoon: A Collector\u27s Problem • Quaker Meeting-Houses • The Bannister-back Chair • Pies in Dutchland • Amusements in Rural Homes Around the Big and Little Mahoning Creeks, 1870-1912 • About the Authors • Buckskin or Sackcloth? A Glance at the Clothing Once Worn by the Schwenkfelders in Pennsylvaniahttps://digitalcommons.ursinus.edu/pafolklifemag/1001/thumbnail.jp

Pennsylvania Folklife Vol. 11, No. 1

• A Dunker Weekend Love Feast of 100 Years Ago • The Peacock in Pennsylvania • The Get-Togethers of the Young Amish Folk • Church and Meetinghouse Stables and Sheds • Abraham Harley Cassel - Dunkard Bibliophile • Mennonite Folklore • Springs and Springhouses • Finishing Wooden Surfaces • Early Funeral Notices • Collecting Dialect Folk Songshttps://digitalcommons.ursinus.edu/pafolklifemag/1006/thumbnail.jp

After DART: Using the First Full-scale Test of a Kinetic Impactor to Inform a Future Planetary Defense Mission

NASA’s Double Asteroid Redirection Test (DART) is the first full-scale test of an asteroid deflection technology. Results from the hypervelocity kinetic impact and Earth-based observations, coupled with LICIACube and the later Hera mission, will result in measurement of the momentum transfer efficiency accurate to ∼10% and characterization of the Didymos binary system. But DART is a single experiment; how could these results be used in a future planetary defense necessity involving a different asteroid? We examine what aspects of Dimorphos’s response to kinetic impact will be constrained by DART results; how these constraints will help refine knowledge of the physical properties of asteroidal materials and predictive power of impact simulations; what information about a potential Earth impactor could be acquired before a deflection effort; and how design of a deflection mission should be informed by this understanding. We generalize the momentum enhancement factor β, showing that a particular direction-specific β will be directly determined by the DART results, and that a related direction-specific β is a figure of merit for a kinetic impact mission. The DART β determination constrains the ejecta momentum vector, which, with hydrodynamic simulations, constrains the physical properties of Dimorphos’s near-surface. In a hypothetical planetary defense exigency, extrapolating these constraints to a newly discovered asteroid will require Earth-based observations and benefit from in situ reconnaissance. We show representative predictions for momentum transfer based on different levels of reconnaissance and discuss strategic targeting to optimize the deflection and reduce the risk of a counterproductive deflection in the wrong direction

Pennsylvania Folklife Vol. 12, No. 2

• The Township Weavers of Pennsylvania • Amish Funerals • The Bush-Meeting Dutch • Steep Roofs and Red Tiles • Carpet Rag Parties • Fences in Rural Pennsylvania • Folk Festival Program • A Study of the Dialect Terminology of the Plain Sects of Montgomery County, Pa. • Henry Chapman Mercer, Pennsylvania Folklife Pioneer • The Glingelsock • Sauerkraut in the Pennsylvania Folk-Culture • Collectaneahttps://digitalcommons.ursinus.edu/pafolklifemag/1010/thumbnail.jp

Orbital effects of a monochromatic plane gravitational wave with ultra-low frequency incident on a gravitationally bound two-body system

We analytically compute the long-term orbital variations of a test particle orbiting a central body acted upon by an incident monochromatic plane gravitational wave. We assume that the characteristic size of the perturbed two-body system is much smaller than the wavelength of the wave. Moreover, we also suppose that the wave's frequency is much smaller than the particle's orbital one. We make neither a priori assumptions about the direction of the wavevector nor on the orbital geometry of the planet. We find that, while the semi-major axis is left unaffected, the eccentricity, the inclination, the longitude of the ascending node, the longitude of pericenter and the mean anomaly undergo non-vanishing long-term changes. They are not secular trends because of the slow modulation introduced by the tidal matrix coefficients and by the orbital elements themselves. They could be useful to indepenedently constrain the ultra-low frequency waves which may have been indirectly detected in the BICEP2 experiment. Our calculation holds, in general, for any gravitationally bound two-body system whose characteristic frequency is much larger than the frequency of the external wave. It is also valid for a generic perturbation of tidal type with constant coefficients over timescales of the order of the orbital period of the perturbed particle.Comment: LaTex2e, 24 pages, no figures, no tables. Changes suggested by the referees include