175 research outputs found
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The Aza-Diels—Alder Reaction: Novel Chemistry for the Synthesis of Quinoline-based Materials
No full textPolyquinolines have been studied since the early 1970s for their favorable chemical, optical, electrical, and mechanical properties. These properties have allowed polyquinolines to demonstrate their value in optoelectronics and biomedical applications. To date, polyquinolines are prepared primarily through a limited number of synthetic strategies, including Suzuki couplings, the Sonogashira reaction, and the Friedlander synthesis. This work demonstrates the application of the aza-Diels–Alder (Povarov) reaction for the synthesis of AB-type, AABB-type, sequence-specific, and bioconjugate quinoline model compounds and polymers. Our approach furnishes molecules with a unique architecture and connectivity, and therefore, may represent a welcome addition to the polymer chemist’s toolkit, by providing facile access to a diverse library of quinoline-type materials
Responds Dinamik Pelat Lantai Dasar Akibat Beban Setempat Friedlander
No full textBlast loading is among the phenomena that may cause destruction to a building. As a dynamic load, blast load needs to be further studied. On this research, the author attempted to study the effect of blast loading to the dynamic responses of ground floor slabs. The blast load is modelled as a Friedlander localized load, with the negative phase taken into account. This is based on the results of previous researches that the abandonment of the negative phase is not a conservative approach. The load is modelled according to the Cubic Negative Phase equation. A variety of blast load positions, slab thickness, and damping ratio is made to observe the dynamic responses of ground floor slabs due to the load. The ground floor slabs are modelled as an orthotropic slab supported on semi rigid restraints on a Pasternak elastic foundation model. Dynamic responses of a slab depends on some factors, such as Pasternak foundation shear modulus, ground stiffness modulus, and slab thickness. As the output, the dynamic response of the slabs under some variety of load positions, slab thickness, and damping ratio, are obtained, including absolute maximum deflection and bending moment diagram
Lyrics of the Umpqua,
No full textMode of access: Internet.Presentation copy to Fannie Friedlander from the author
RateMyProfessors.com™: The Impact of Negative Online Professor Reviews on Student Judgement
No full textNegatively-valenced emotional expressions (NVEE) are identified by the use of extreme language, emoticons, bold lettering, capitalization, and exclamation marks. When used in online review forums, NVEE are indicative of the severity of negative reviews, which may be perceived as less valid than negative reviews without NVEE. We sought to examine the effects of NVEE on student likelihood to take a professor’s class. We presented 51 university students with reviews based on RateMyProfessors.comTM. Students were randomly assigned to one of three conditions: positive reviews, negative reviews with NVEE, or negative reviews without NVEE. We found that students who viewed the positive reviews were significantly more likely to take the course than those who viewed negative reviews. Contrary to our prediction, the negative reviews with NVEE condition did not indicate greater likelihood of taking the course to the negative review condition without NVEE. However, qualitative analysis of student response to reviews showed that students were skeptical of reviews with NVEE, indicating that this research is relevant and useful for understanding what makes online reviews helpful
Trustworthy 100-Year Digital Objects: Durable Encoding for When It's Too Late to Ask
No full textHow can an author store digital information so that it will be reliably intelligible, even years later when he is no longer available to answer questions? Methods that might work are not good enough; what is preserved today should be reliably intelligible whenever someone wants it. Prior proposals fail because they generally confound saved data with irrelevant details of today’s information technology—details that are difficult to define, extract, and save completely and accurately.
We use a virtual machine to represent and eventually to render any data whatsoever. We focus on a case of intermediate difficulty—an executable procedure—and identify a variant for every other data type.
This solution might be more elaborate than needed to render some text, image, audio, or video data. Simple data can be preserved as representations using well-known standards. We sketch practical methods for files ranging from simple structures to those containing computer programs, treating simple cases here and deferring complex cases for future work. Enough of the complete solution is known to enable practical aggressive preservation programs today.
Nanoparticles made-to-measure: Aerosols prove to be indispensable for nanotechnology
No full textIs it possible to make platinum particles with a diameter of less than eight nanometres? That was the question Jan Marijnissen at the aerosol lab of Delft ChemTech was asked. Together with graduate student Jan van Erven, the famous aerosol expert Sheldon Friedlander of the University of California (UCLA), and the University of Karlsruhe, Germany, Marijnissen set out to experiment. He managed to do achieve this by using his favourite electrospray method. While they were at it, the research teams used an electron microscope to see how a soot filter uses the platinum nanogranules to get rid of its soot
Detection theorem for finite group schemes
No full textAbstractIn this paper we prove a general detection theorem for finite group schemes. This theorem generalizes both the classical detection theorem for finite groups of Quillen and Venkov and the detection theorem for infinitesimal group schemes proved previously in a joint paper of the author, Friedlander and Bendel
Emitter position and velocity estimation given time and frequency differences of arrival
No full textWho Put out the Lamps: Thoughts on International Law and the Coming of World War I
No full textThe impact of international law on the crisis politics of world order is the subject of this insightful article. The author briefly traces the origins of international law before focusing particularly on the events of the First World War. Although acknowledging that in this instance international law was powerless to alter the course of events leading to the first great international conflict, the author observes that the role of the law was much more significant than most historians credit. International law, the author concludes, offers at least the hope that in future crises the law will influence, rather than be influenced by, politicians
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