1,512 research outputs found
Data for: The effects of cognitive testing on the welfare of zoo-housed Japanese macaques (Macaca fuscata)
No full textRates of Japanese macaque behavior when cognitive testing was available and unavailable to the social group in their exhibit at Lincoln Park Zoo
The Jacobson radical of rings with nilpotent homogeneous elements
No full textA result of Bergman says that the Jacobson radical of a graded algebra is homogeneous. It is shown that while graded Jacobson radical algebras have homogeneous elements nilpotent, it is not the case that graded algebras all of whose homogeneous elements are nilpotent are Jacobson radical. To contrast this, the following result of the author is slightly extended. Let R be a graded algebra generated in the degree one. If for every n, the n x n matrix algebra over R has all homogeneous elements nilpotent, then R is Jacobson radical.</p
Chimpanzee problem solving and flexibility
No full textA male chimpanzee at Lincoln Park Zoo using the ape-plunk task in a test of problem solving and flexibility. This chimpanzee was one of 13 apes (chimpanzees and gorillas) tested with this task by Sarah Jacobson and Lydia Hopper. The video shows the chimpanzee complete the final three trials in phase 1 (four straws below the reward, one above it) and the first trial in phase 2 (two straws below the reward, three above it). The video highlights the apes use of multiple action sequences (order of straw removal) within phases as well as their flexibility across phases (in spite of the task configuration change, the chimpanzee only removes straws below the reward). The video has been sped up to 2x natural speed. </div
Formamidinium-Based Dion-Jacobson Layered Hybrid Perovskites: Structural Complexity and Optoelectronic Properties
No full textLayered hybrid perovskites have emerged as a promising alternative to stabilizing hybrid organic–inorganic perovskite materials, which are predominantly based on Ruddlesden-Popper structures. Formamidinium (FA)-based Dion-Jacobson perovskite analogs are developed that feature bifunctional organic spacers separating the hybrid perovskite slabs by introducing 1,4-phenylenedimethanammonium (PDMA) organic moieties. While these materials demonstrate competitive performances as compared to other FA-based low-dimensional perovskite solar cells, the underlying mechanisms for this behavior remain elusive. Here, the structural complexity and optoelectronic properties of materials featuring (PDMA)FAn–1PbnI3n+1 (n = 1–3) formulations are unraveled using a combination of techniques, including X-ray scattering measurements in conjunction with molecular dynamics simulations and density functional theory calculations. While theoretical calculations suggest that layered Dion-Jacobson perovskite structures are more prominent with the increasing number of inorganic layers (n), this is accompanied with an increase in formation energies that render n > 2 compositions difficult to obtain, in accordance with the experimental evidence. Moreover, the underlying intermolecular interactions and their templating effects on the Dion-Jacobson structure are elucidated, defining the optoelectronic properties. Consequently, despite the challenge to obtain phase-pure n > 1 compositions, time-resolved microwave conductivity measurements reveal high photoconductivities and long charge carrier lifetimes. This comprehensive analysis thereby reveals critical features for advancing layered hybrid perovskite optoelectronics.</p
Linda Jacobson Interview Virtual Reality Evangelist
No full textIn the interview with Linda Jacobson, a Virtual Reality (VR) artist, Jacobson discusses the current and future state of VR technology’s role in the politics of the body, social identity, self, gender, class, and race. This article discusses the fact that barriers to access exist for a more diverse set of artists across race, class, and gender to engage with VR technology and the need to evolve the development platform, so artists can implement their ideas in a low-cost way. The author discusses Jaron Lanier’s ideas about using VR to explore other identities based on a theatrical model where the computer is the performance space and the audience takes part in the creation of performance. The audience then becomes co-creator in the art and is no longer just a consumer
The Good of the Few: Reciprocity in the Provision of a Public Bad
No full textPeople have been shown to engage in favor-trading when it is efficiency-enhancing to do so. Will they also trade favors when it reduces efficiency, as in a series of wasteful public projects that each benefits an individual? We introduce the “Stakeholder Public Bad” game to study this question. In each round, contributions to a common fund increase the earnings of one person (the “Stakeholder”) but reduce the earnings of the rest of the group so much that overall efficiency is reduced. The Stakeholder position rotates through members of the group and the promise of the high reward associated with this position may enable subjects to behave reciprocally. We hypothesize that some people will help a current Stakeholder by contributing in hopes of being rewarded later with a reciprocal gift. In a lab experiment, we find evidence of such favor trading. We also find that Stakeholders in this situation seem perfectly willing to sacrifice the good of the group to reap their own personal rewards, and this is true even when their contribution decisions are public. While the revelation of information about others’ actions and roles has previously been shown to enable efficiency-increasing reciprocity, we show that it also enables efficiency-decreasing reciprocal acts. Subjects who are more risk-averse behave in a way that is more myopically self-interested as compared to less risk-averse people when information conditions preclude favor trading, and subjects who identify with the Democratic Party show more restraint when they are Stakeholder than those who do not.logrolling, social preferences, reciprocity, externalities, public bad, public good
Hunter, the Stag, and the Mother of Animals: Image, Monument, and Landscape in Ancient North Asia. By Esther Jacobson-Tepfer
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The Hunter, the Stag, and the Mother of Animals: Image, Monument, and Landscape in Ancient North Asia. By Esther Jacobson-Tepfer. Oxford: Oxford University Press, 2015. Pp. xxxiii + 413. $85.


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There'll Come / a Time / Song / Words by / Billy Howard / Music by / Elven Hedges / Sung by / HEDGES BROS & JACOBSON
No full textBox no. 6Elven Hedges: There'll Come a Time; music printItem type: single sheet | Content type: music | Counting of pages: page numbersVocal-instrumental score | staff notation; tonic sol-fa notation | voice; piano"No use running, he'll catch you someday [...]
Painting Culture, Painting Nature : Stephen Mopope, Oscar Jacobson, and the Development of Indian Art in Oklahoma
No full textIn the late 1920s, a group of young Kiowa artists, pursuing their education at the University of Oklahoma, encountered Swedish-born art professor Oscar Brousse Jacobson (1882–1966). With Jacobson’s instruction and friendship, the Kiowa Six, as they are now known, ignited a spectacular movement in American Indian art. Jacobson, who was himself an accomplished painter, shared a lifelong bond with group member Stephen Mopope (1898–1974), a prolific Kiowa painter, dancer, and musician. Painting Culture, Painting Nature explores the joint creativity of these two visionary figures and reveals how indigenous and immigrant communities of the early twentieth century traversed cultural, social, and racial divides.Painting Culture, Painting Nature is a story of concurrences. For a specific period, immigrants such as Jacobson and disenfranchised indigenous people such as Mopope transformed Oklahoma into the center of exciting new developments in Indian art, which quickly spread to other parts of the United States and to Europe. Jacobson and Mopope came from radically different worlds, and were on unequal footing in terms of power and equality, but they both experienced, according to author Gunlög Fur, forms of diaspora or displacement. Seeking to root themselves anew in Oklahoma, the dispossessed artists fashioned new mediums of compelling and original art.Although their goals were compatible, Jacobson’s and Mopope’s subjects and styles diverged. Jacobson painted landscapes of the West, following a tradition of painting nature uninfluenced by human activity. Mopope, in contrast, strove to capture the cultural traditions of his people. The two artists shared a common nostalgia, however, for a past life that they could only re-create through their art.Whereas other books have emphasized the promotion of Indian art by Euro-Americans, this book is the first to focus on the agency of the Kiowa artists within the context of their collaboration with Jacobson. The volume is further enhanced by full-color reproductions of the artists’ works and rare historical photographs.</p
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