2,762 research outputs found
Meteorological features during the Marginal Ice Zone Experiment from 20 March to 10 April 1987.
No full texthttp://archive.org/details/meteorologicalfe109452235
Stabilization of vinylic intermediates in the addition, cyclization, and oligomerization reactions of alkynes by coordination of molybdenum and tungsten. The crystal and molecular structure of [W(SC6H4Me-p)[η2-C(CF3)C(CF3)PEt3] (η2-CF3C≡CCF3)(η-C5H5)] and [WCl[η2-C(CF3)C(CF3)CN](η2-CF3C≡CCF3)(η-C5H5)]
No full textNucleophilic attack of phosphines, phosphites or Me3CNC on the η2-CF3C≡CCF3 (L) complexes L2WBr2(CO) and L2MX(Cp) (Cp = η5-cyclopentadienyl; M = Mo, W, X = Cl, SC6F5; M = W, X = SC6H4Me-p) occurs at an acetylenic C atom to give 1:1 adducts. The products, I [X = SC6H4Me-p, L1 = PEt3 (II); X = Cl, L1 = Me3CNC (III)] were shown by x-ray diffraction to contain a metal-stabilized 1-3 dipolar vinyl ligand L+C(CF3)C-(CF3) η2-coordinated to the W center. The structures of II and III were refined to R 0.038, 0.040, for 2924, 6900 independent reflections, resp
Synthesis and reactions of tungsten(II) norbornadiene (nbd) complexes. The crystal and molecular structure of [WBr(SC6F5)(CO)2(nbd)]
No full textThe reaction of [WBr2(CO)2(nbd)] 1 (nbd = norbornadiene) with Tl(C5H5) gave a monocarbonyl deriv. [WBr(CO)(nbd)(η5-C5H5)] 2. With Tl(O2CMe) and Tl[O(S)CMe], complex 1 gave monosubstituted derivs. [WBr(O2CMe)(CO)2(nbd)] 3a and [WBr{O(S)CMe}(CO)2(nbd)] 3b which appear to be seven-coordinate according to IR data. In contrast 1 and Tl(SC6F5) (1:1 molar ratio) gave the six-coordinate complex [WBr(SC6F5)(CO)2(nbd)] 4. An x-ray diffraction study of 4 established that it has a distorted-octahedral structure with trans W-CO bonds approx. perpendicular to a plane contg. the W, Br and S atoms and the midpoints of the nbd C:C bonds. Simple electronic arguments provide a rationalization of many of the structural features of 4. Reaction of 1 with 2 molar equivalents of Tl(SC6F5) gave the bis(thiolate) deriv. [W(SC6F5)(CO)2(nbd)] 5 again with a trans arrangement of CO ligands. The reactions of 5 with L = PEt3, PMe2Ph or P(OMe)3 gave the six-coordinate complexes [W(SC6F5)2(CO)2L2] 6 which exist in two isomeric forms, red or green. Dynamic NMR studies have been used to characterize the isomeric behavior and fluxional processes in the complexes
Life and experiences of George Washington Nichols
No full textTypescript of an account of some anecdotes from the life of George Washington Nichols (born 1859) of Salt Lake City. Author unknown; transcribed by Kenneth L. Seifert of Brigham City, April 25, 193
1958 Ohio Agricultural Experiment Station Recommendations for Nursery Stock, Trees, Shrubs and Turf
No full textInsect pests / R. B. Neiswander -- Insect pests / Ralph E. Davidson -- Plant diseases / C. Wayne Ellett -- Chemical control of weeds / E. K. Alban -- Chemical control of weeds in nursery and plant bed areas / L. C. Chadwick, W. D. Chambers and Bryson James -- Some thoughts on timely lawn questions / R. R. Davis -- Production of nursery stock in containers / Kenneth W. Reisch and Robert Setzer -- Foliar analysis as a means of determining the nutritional requirements of trees / Kenneth W. Reisch and Thomas Canno
Prenatal care advice to see a dentist: results from a population-based study
No full textMeredith L. Vandermeer (Department of Public Health, Oregon State University), Kenneth D. Rosenberg (Office of Family Health, Oregon Department of Human Services), Alfredo P. Sandoval (Oregon Health & Science University).Title from PDF caption (viewed on August 14, 2020).This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Mode of access: Internet from the Oregon Government Publications Collection.Text in English
Synthesis and reactions of the coordinatively unsaturated hexafluorobut-2-yne complex [WBr2(CO)(CF3C≡CCF3)2]. The crystal and molecular structure of di-μ-bromobis{carbonyl[3-(diethoxyphosphoryl)hexafluorobut-2-en-2-yl](η-hexafluorobut-2-yne)tungsten}
No full textReaction of [{WBr2(CO)4}2] with CF3C≡CCF3 in pentane affords the bis(alkyne) complex [WBr2(CO)(CF3C≡CCF3)2] (I) in which the carbonyl ligand appears to function as a σ-donor ligand only, according to IR data. I reacts with P(OMe)3 and P(OEt)3 to give dimeric complexes II (R = Me, Et) contg. a novel vinylphosphonate ligand resulting from a Michaelis-Arbuzov type elimination of alkyl bromide. The structure of the complex with R = Et has been detd. by x-ray anal. The tungsten coordination is octahedral with mutually cis carbonyl and σ-alkenyl carbon atoms both trans to μ-Br groups, and with phosphate O trans to a four-electron donor η2-CF3C≡CCF3. The bonding in the novel vinyl phosphonate W[C(CF3):C(CF3)P(OEt)2O] chelate ring is discussed
Latino politics: identity, mobilization, and representation
No full textDue to the dramatic growth of the Latino population in America, in combination with the relative decline of the Anglo (non-Hispanic white) share, Latino Studies is increasingly at the forefront of political concern. With Latino Politics: Identity, Mobilization, and Representation, editors Rodolfo Espino, David L. Leal, and Kenneth J. Meier bring together essays from a number of leading scholars to address the ever-more important issues within the field. Providing an overview of issues surrounding Latino identity and political opinion—such as differences among Latino groups based on national origin, the importance of descriptive representation, and issues of competition and cooperation, particularly with reference to African Americans—the editors speak to the many fundamental debates ingrained in the discipline.
In addition to highlighting important contributions of the study of Latino politics to date, this volume suggests areas that have yet to be explored and, perhaps more importantly, demonstrates how the study of Latino politics relates to broader questions of American politics and society. Foregrounding debates in the overall discipline of political science, the collection will appeal to those who study Latino politics as well as those who are interested in understanding American politics and society with reference to Latino and "minority" concerns
Why Equality Matters
No full textKenneth L. Karst, a prolific author in the field of constitutional law, gave the fall quarter Sibley Law Lecture October 28.The UCLA law professor addressed the topic Why Equality Matters in his lecture, which was the 56th in the John A. Sibley Lecture Series.
A full summary of this event was published in the Advocate Magazine Volume 19, Issue 1, Spring 1983 on page 2: https://digitalcommons.law.uga.edu/advocate/vol19/iss1/1
Modification of nektonic fish distribution by piers and pile fields in an urban estuary
No full textLarge urban piers degrade habitat value for several estuarine benthic fish species by shading, but their effects on mobile nektonic species is less well understood due to sampling challenges. Dual Frequency Identification Sonar (DIDSON) allowed equal access to sampling in the water column of structured shaded and unshaded vs. open environments in both dark and light conditions by methods similar to video but without light. Sampling (n = 228, 5-minute transects) occurred under and around four large municipal piers of varying dimensions in the Hudson River estuary during day and night from summer and fall in 2007 - 2009. The distribution of small (5 - 25 cm in length) and large (25 – 850 cm) fishes were analyzed separately in recognition of functional guild differences. Small fishes occupied open water, shaded under-pier, and un-decked relict piling habitats, but were significantly more abundant during the day in open unshaded water than under adjacent piers or in piling habitats.. Small fish occurred under 3 of 4 piers of varying size and configuration at 10 - 20% of the median abundances of adjacent open water. However, while schools were rare under piers they could be very large, so that abundance greatly exceeded mean open water abundance variance so as to preclude confidence in differences among piers. The differences among habitats was not significant at night, and the difference among piers was also not significant at night. School membership for small fish appeared to mitigate adverse effects of shading and may influence scaling of their response to shading and could therefore influence pier design. Large (>25 cm) predatory fish were uncommon but responded similarly to habitat effects as did small fish. Habitats did not segregate fish by guild as small forage fish co-occurred in 65.8% of samples with large piscivores. Studies that provide species-specific and mechanistic interpretation of dynamic habitat use as well as further quantification of scaling effects could improve our understanding of how fishes respond to piers and other structures on urban shorelines.Peer reviewed
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