118,029 research outputs found
Heinr. Baltzer s/ l. R. Rahn zur freundlichen Erinnerung
No full textDedikationssilhouette nach links von Heinrich Baltzer, gewidmet Johann Rudolf Rahn (1841-1912)Anonyme/r Künstler/inHandschriftliche Notiz auf der Buchseite unten "Heinr. Baltzer s/ l[ieben] R. Rahn zur freundlichen Erinnerung
Substrate modulation of the activity of an artificial nanoesterase made of peptide-functionalized gold nanoparticles
No full textNanozymes with a heart of gold: A functional artificial protein has been prepared by grafting a dodecapeptide onto the surface of gold nanoparticles. The system catalyzes the hydrolysis of carboxylate esters and features enzyme-like properties
Data for: Overwintering fires can occur in both peatlands and upland forests with varying ecological impacts
No full textThis dataset is original data from overwintering and single season fires in the Northwest Territories, Canada. It includes species-specific pre- and post-fire tree stem density estimates, stand structural data, and above and belowground combustion data for sites that burned in 2014 (single season fires), some of which continued to burn through the winter, reignite in the spring and reburn in the 2015 fire season (overwintering fires). In each region, we sampled adjacent overwintering and single-season burn sites. We used previous detections of overwintering fires based on satellite data and reports from fire managers to identify overwintering fires and increased the accuracy of overwintering fire locations using 30m Landsat imagery. Adjacent to these overwintering sites, we identified single-season burn sites from within portions of the 2014 fires that were unaffected by overwintering. The identified single-season sampling location was also evaluated on the ground to ensure comparability in site attributes identified to be important to post-fire outcomes such as pre-fire tree species composition and site drainage. Because all sampling was conducted by helicopter, where proximal overwintering fire sampling locations were environmentally similar, we used a shared single-season fire as the unburned contrast for efficiency in flight time. Data are provided for nine overwintering fire sites and six single-season fires sites. Accompanying data from Alaska (Walker and Mack. 2024 a,b,c) were included for analysis in the accompanying manuscript
Multi-sweep asynchronous parallel successive overrelaxation for the nonsymmetric linear complementarity problem
No full textConvergence is established for the multi-sweep asynchronous parallel successive overrelaxation (SOR) algorithm for the nonsymmetric linear complementarity problem. The algorithm was originally introduced in [4] for the symmetric linear complementarity problem. Computational tests show the superiority of the multi-sweep asynchronous SOR algorithm over its single-sweep counterpart on both symmetric and nonsymmetric linear complementarity problems. © 1990 J.C. Baltzer AG, Scientific Publishing Company
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Parallel gradient projection successive overrelaxation for symmetric linear complementarity problems and linear programs
No full textA gradient projection successive overrelaxation (GP-SOR) algorithm is proposed for the solution of symmetric linear complementary problems and linear programs. A key distinguishing feature of this algorithm is that when appropriately parallelized, the relaxation factor interval (0, 2) is not reduced. In a previously proposed parallel SOR scheme, the substantially reduced relaxation interval mandated by the coupling terms of the problem often led to slow convergence. The proposed parallel algorithm solves a general linear program by finding its least 2-norm solution. Efficiency of the algorithm is in the 50 to 100 percent range as demonstrated by computational results on the CRYSTAL token-ring multicomputer and the Sequent Balance 21000 multiprocessor. © 1988 J.C. Baltzer A.G., Scientific Publishing Company
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