79,167 research outputs found
William Gaston Simmons Papers
No full textSimmons, an alumnus of Wake Forest College (Class of 1852), later became Professor of Natural Science and Chemistry, and served as Bursar and Treasurer of Wake Forest College.His papers consist of a receipt signed by Simmons as Burser; his resignation in 1856; a postal card to J.W. Denmark, 1878; and a letter to W.E. Wilson, 1873
The Benefits of Being Economics Professor A (and not Z)
Get PDFAlphabetic name ordering on multi-authored academic papers, which is the convention in the economics discipline and various other disciplines, is to the advantage of people whose last name initials are placed early in the alphabet. As it turns out, Professor A, who has been a first author more often than Professor Z, will have published more articles and experienced afaster growth rate over the course of her career as a result of reputation and visibility. Moreover, authors know that name ordering matters and indeed take ordering seriously: Several characteristics of an author group composition determine the decision to deviate from the default alphabetic name order to a significant extent.performance measurement, incentives, economists, name ordering
Final word on Jersey Dutch
No full textIn this article, William Z. Shetter compares and contrasts the dialects that developed between different Dutch colonies in the New World. He explores in-depth the nuances of Jersey Dutch, and provides theories to explain how Dutch and colonial languages blended. The article is reprinted from American Speech, December 1958, Volum XXXIII, No. 4
Polymer-based treatments to control runoff, leachate and erosion from engineered slopes at Simfer Mine, Guinea, Africa
Get PDFIt is necessary to understand the erodibility and hydrological response of mine-site slope forming materials (SFMs), because of increasing awareness of the environmental impacts of mining. Steep engineered slopes in high intensity rainfall environments present a serious erosion risk. Temporary surface stabilisers, such as polyacrylamides (PAMs) and polyvinylacrylic latex (PVALs) are potentially cost effective erosion control solutions. In this study PAM and PVAL efficacy to reduce runoff, leachate and erosion was assessed at two application rates, with and without gypsum on SFMs from an iron ore mine in Guinea (West Africa). NSPASS (near-surface photogrammetry assessment of slope forming materials’ surface roughness) is a novel method that integrates digital image capture and GIS. It is shown to detect and quantify surface micro-relief changes of 2-3 mm, not visible to the naked eye.
As expected, soil and non-soil SFMs were significantly different in terms of their physical and chemical properties. Phase I of the study investigated the erodibility of ten SFMs, including soil, ore and waste-rock. The results indicate that the hydrological response to rainfall of most SFMs is to generate leachate. Weathered phyllite (PHY-WEA) is the most erodible SFM by both runoff and leachate. Multiple regression analysis demonstrated that magnetic susceptibility, mineralogy and dry aggregate distribution; parameters not commonly assessed in erosion studies, are important in explaining SFM erodibility and hydrological response.
Phase II evaluated critically the effectiveness of three commercially available polymer solutions (two PAMs and one PVAL) at reducing runoff, leachate and erosion from four of the most erodible SFMs identified in Phase I. The results indicate that some PAM and PVAL treatments significantly reduce runoff, leachate and erosion. Polymer efficacy is highly dependent on the physical and chemical properties of the SFM, as well as the mechanism of polymer to SFM adsorption. Increasing the application rate of select treatments lowered leachate volumes, runoff and leachate total sediment loads. Contrary to previous studies, gypsum amendments did not significantly improve polymer efficiency.
This research has added to our understanding of the erodibility and hydrological response of soil and non-soil SFMs. This is the first study to evaluate critically the efficacy of PVALs in controlling erosion from mine-site SFMs. Future studies should continue to optimise NSPASS performance in monitoring changes in surface micro-relief
Merrifield-Simmons index dvou typů phenylenů
No full textThe Merrifield-Simmons index i(G) of a simple undirected graph G=(V,E) is the number of all independent sets of vertices in G. This number is one of the most popular topological indices in chemistry. In this contribution we obtain exact formulas for the Merrifield-Simmons index of two types of the branched phenylenes whose molecular graph consists of two linear chains of alternating hexagons and quadrangles, together forming a bent chain.The Merrifield-Simmons index i(G) jednoduchého neorientovaného grafu G=(V,E) je počet všech nezávislých množin uzlů v G. Toto číslo je jedním z nejvýznamnějších topologických indexů v chemii. V tomto příspěvku prezentujeme exaktní formule pro Merrifield-Simmonsův index dvou typů větvených phenylenů, jejichž molekulární graf obsahuje dva lineární řetězce střídajících se šestičlenných a čtyřčlenných cyklů, společně vytvářejících lomený řetězec
Merrifield-Simmons Index and Its Entropy of the 4-8-8 Lattice
Get PDFThe Merrifield-Simmons index is a topological index used in structural chemistry for quantifying relevant properties of molecular structure. This index, in different names, has been studied on the square, triangular and hexagonal lattices by using the method of transfer matrix. To compute the Merrifield-Simmons index of more complicated lattices such as the 4-8-8 and triangular Kagomé lattices, the use of multi-step transfer matrices is needed. In this paper we introduce the concept of transfer multiplicity and use multi-step transfer matrices to derive a rigorous upper and lower bound for the entropy of Merrified-Simmons index of the 4-8-8 lattice. We show that this method can be used to deal with other complex 2-dimensional lattices
The biology and conservation of the Damara Tern in Namibia
No full textThe globally Near-threatened Damara Tern Sterna balaenarum is little known and faces several conservation issues. The aim of this study was to provide a description of the ecology and numbers of the species and discuss conservation management plans that will effectively ensure its survival
Z. Erhard, C. Hoff, G. Simmons, Bert Daniels, E. Bergen
No full textPhoto shows New York Yankees baseball players Zachary Erhard. Chester Cornelius Hoff (1891-1998), George Simmons, Bert Daniels, and E. Bergen probably at Pennsylvania Station in 1912. (Source: Flickr Commons project, 2008 and New York Times; March 3, 1912)Title from unverified data provided by the Bain News Service on the negatives or caption cards.Forms part of: George Grantham Bain Collection (Library of Congress).General information about the Bain Collection is available at http://hdl.loc.gov/loc.pnp/pp.ggbai
Systemic adjuvant chemotherapy for cholangiocarcinoma surgery: A systematic review and meta-analysis
No full textBACKGROUND: The role of adjuvant therapy for biliary tract cancer is not clearly defined with conflicting results demonstrated across nonrandomized and randomized studies. We report a systematic review and meta-analysis to delineate the effect of AT on overall survival.METHODS: Eligible studies were identified from MEDLINE, EMBASE, Cochrane and PubMed. Studies comparing adjuvant chemotherapy or chemoradiotherapy after curative-intent surgery with curative surgery only for biliary tract cancer were included. Data pertaining to tumours of the gallbladder and bile ducts were included. The primary outcome assessed was overall survival. Random-effects meta-analysis was performed, as well as pooling of unadjusted Kaplan-Meier curve data.RESULTS: 35 studies involving 42,917 patients were analysed. There was a significant improvement in overall survival with any adjuvant therapy after surgery compared with surgery only (HR 0.74; 95% CI, 0.67 to 0.83; P < 0.001). There was a significant benefit for adjuvant therapy in those with margin positive surgery (RR, 0.83; 95% CI, 0.77 to 0.91; P < 0.001) and node-positive disease (RR 0.82; 95% CI 0.76 to 0.89; P < 0.001) CONCLUSION: Our review advocates the use of adjuvant therapy in bile duct cancer after curative intent resection. Further prospective studies are needed to determine the optimal regime and timing of an adjuvant approach.</p
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