Generalized boundary strata classes

We describe a generalization of the usual boundary strata classes in the Chow ring of $\overline{\mathcal{M}}_{g,n}$. The generalized boundary strata classes additively span a subring of the tautological ring. We describe a multiplication law satisfied by these classes and check that every double ramification cycle lies in this subring.Comment: For the Proceedings of the 2017 Abel Symposium, 10 page

Summary of recent investigations of inlet flow distortion effect on engine stability

A review is presented of recent experimental results, analytical procedures and test techniques employed to evaluate the effects of inlet flow distortion on the stability characteristics of representative afterburning turbofan and turbojet compression systems. Circumferential distortions of pressure and temperature, separately and in combination are considered. Resulting engine sensitivity measurements are compared with predictions based on simplified parallel compressor models and with several distortion descriptor parameters

Progress, Process and the Critique of Development: The Interplay of Gender and Genre in The Morgesons

Elizabeth Barstow Stoddard\u27s work received little public attention or critical acclaim during her lifetime. Only now, more than a hundred years after her best work was completed, has Stoddard begun to find an enthusiastic audience. Stoddard wanted badly the success which eluded her, yet she was not willing to sacrifice her intellectual and artistic integrity in order to sell books. She had only contempt for the countless women writers of her day, the tribe of intellectual gardeners and vegetable growers, who gained widespread popularity with their frothy, ornate, and romantic fiction. She wanted to be seen as a consequential and powerful author-- recognition that was characteristically ceded only by men to other men. Stoddard was an outsider who looked on the inner circle with a mixture of envy, distaste, admiration, and ironic distance. In several columns written for the Daily Alta California, Stoddard focuses on the role of the serious female artist or intellectual as a valiant outsider who must struggle to enter the domain appropriated by men to themselves. That struggle to be accepted is characterized as warlike: Men are polite to the woman, and contemptuous to the intellect. They do not allow women to enter their intellectual arena to do battle with them... In a letter from 1856 Stoddard sheds light on her own adversarial relationship as a woman writer to the prevailing -- male -- standards: The Literary Female is abroad, and the souls of literary men are tried. I am afraid to think of writing a book, and only intend to keep up a guerilla kind of warfare by sending out odds and ends. If Stoddard\u27s early poems and short stories were guerilla warfare, small covert forays into hostile territory, the first novel would express an ended, although no less subtle, attack on male literary formulations

Progress, Process and the Critique of Development: The Interplay of Gender and Genre in The Morgesons

Elizabeth Barstow Stoddard\u27s work received little public attention or critical acclaim during her lifetime. Only now, more than a hundred years after her best work was completed, has Stoddard begun to find an enthusiastic audience. Stoddard wanted badly the success which eluded her, yet she was not willing to sacrifice her intellectual and artistic integrity in order to sell books. She had only contempt for the countless women writers of her day, the tribe of intellectual gardeners and vegetable growers, who gained widespread popularity with their frothy, ornate, and romantic fiction. She wanted to be seen as a consequential and powerful author-- recognition that was characteristically ceded only by men to other men. Stoddard was an outsider who looked on the inner circle with a mixture of envy, distaste, admiration, and ironic distance. In several columns written for the Daily Alta California, Stoddard focuses on the role of the serious female artist or intellectual as a valiant outsider who must struggle to enter the domain appropriated by men to themselves. That struggle to be accepted is characterized as warlike: Men are polite to the woman, and contemptuous to the intellect. They do not allow women to enter their intellectual arena to do battle with them... In a letter from 1856 Stoddard sheds light on her own adversarial relationship as a woman writer to the prevailing -- male -- standards: The Literary Female is abroad, and the souls of literary men are tried. I am afraid to think of writing a book, and only intend to keep up a guerilla kind of warfare by sending out odds and ends. If Stoddard\u27s early poems and short stories were guerilla warfare, small covert forays into hostile territory, the first novel would express an ended, although no less subtle, attack on male literary formulations

An Experiment in the Teaching of Industrial Physics

While we as teachers of engineering physics comparing ourselves with ourselves and grading objective tests of many types and stripes are inclined to think that our teaching and student product are satisfactory, there may be criteria which our instruction is not meeting. Impressed with this possibility I have made an analysis of my findings obtained from interviews with my own students, deans of engineering schools and engineers in the practice of their profession. The results of these studies are definite and specific

Atmospheric HULIS: How humic-like are they? A comprehensive and critical review

A class of organic molecules extracted from atmospheric aerosol particles and isolated from fog and cloud water has been termed HUmic-LIke Substances (HULIS) due to a certain resemblance to terrestrial and aquatic humic and fulvic acids. In light of the interest that this class of atmospheric compounds currently attracts, we comprehensively review HULIS properties, as well as laboratory and field investigations concerning their formation and characterization in atmospheric samples. While sharing some important features such as polyacidic nature, accumulating evidence suggests that atmospheric HULIS differ substantially from terrestrial and aquatic humic substances. Major differences between HULIS and humic substances, including smaller average molecular weight, lower aromatic moiety content, greater surface activity, better droplet activation ability, as well as others, are highlighted. Several alternatives are proposed that may explain such differences: (1) the possibility that mono- and di-carboxylic acids and mineral acids abundant in the atmosphere prevent the formation of large humic 'supramolecular associations'; (2) that large humic macromolecules are destroyed in the atmosphere by UV radiation, O₃, and OH^- radicals; (3) that 'HULIS' actually consists of a complex, unresolved mixture of relatively small molecules rather than macromolecular entities; and (4) that HULIS formed via abiotic and short-lived oxidative reaction pathways differ substantially from humic substances formed over long time periods via biologically-mediated reactions. It should also be recalled that the vast majority of studies of HULIS relate to the water soluble fraction, which would include only the fulvic acid fraction of humic substances, and exclude the humic acid (base-soluble) and humin (insoluble) fractions of humic substances. A significant effort towards adopting standard extraction and characterization methods is required to develop a better and meaningful comparison between different HULIS samples

The Ursinus Weekly, June 12, 1903

The college graduate and the masses • Baseball • Baccalaureate sermon • Alumni meeting • President\u27s reception • Alumni oration • Commencement • Class Day exercises • Junior oratorical contesthttps://digitalcommons.ursinus.edu/weekly/3090/thumbnail.jp

The NASA high-speed turboprop program

Technology readiness for Mach 0.7 to 0.8 turboprop powered aircraft with the potential for fuel savings and DOC reductions of up to 30 and 15 percent respectively relative to current in-service aircraft is addressed. The areas of propeller aeroacoustics, propeller structures, turboprop installed performance, aircraft cabin environment, and turboprop engine and aircraft studies are emphasized. Large scale propeller characteristics and high speed propeller flight research tests using a modified testbed aircraft are also considered