6,448 research outputs found
Plans for Humansville waterworks
Humansville is a thriving town of about 1200 inhabitants, situated in Polk county, Missouri, about 120 miles Southeast of Kansas City, with which city it is connected by the Kansas City and Memphis Railroad. The object of this Thesis is to design a system of waterworks for Humansville --page ii
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Solvent and ligand substitution effects on electrocatalytic reduction of CO2 with [Mo(CO)4(x,xĘš-dimethyl-2,2â˛-bipyridine)] (x = 4-6) enhanced at a gold cathodic surface
A series of molybdenum tetracarbonyl complexes with dimethylâsubstituted 2,2â˛âbipyridine (dmbipy) ligands were investigated by cyclic voltammetry (CV) combined with infraâred spectroelectrochemistry (IRâSEC) in tetrahydrofuran (THF) and Nâmethylâ2âpyrrolidone (NMP) to explore their potential in a reduced state to trigger electrocatalytic CO2 reduction to CO. Addressed is their ability to take advantage of a lowâenergy, COâdissociation twoâelectron ECE pathway available only at an Au cathode. A comparison is made with the reference complex bearing unsubstituted 2,2Ęšâbipyridine (bipy). The methyl substitution in the 6,6Ęšâpositions has a large positive impact on the catalytic efficiency. This behaviour is ascribed to the advantageous positioning of the steric bulk of the methyl groups, which further facilitates CO dissociation from the 1eâ reduced parent radical anion. In the contrary, the substitution in the 4,4â˛âpositions appears to have a negative impact on the catalytic performance, exerting a strong stabilizing effect on the Ďâaccepting CO ligands and, in THF, preventing exploitation of the lowâenergy dissociative pathway
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Group 6 complexes as electrocatalysts of CO2 reduction: strong substituent control of the reduction path of [Mo(Ρ3-allyl)(CO)2(x,xâ˛- dimethyl-2,2â˛-bipyridine)(NCS)] (x = 4-6)
A series of complexes [Mo(Ρ3-allyl)(CO)2)(x,xâ˛-dmbipy)(NCS)] (dmbipy = dimethyl-2,2Ęš-bipyridine; x = 4-6) have been synthesized and their electrochemical reduction investigated using combined cyclic voltammetry (CV) and variable-temperature spectroelectrochemistry (IR/UV-vis SEC) in tetrahydrofuran (THF) and butyronitrile (PrCN), at gold and platinum electrodes. The experimental results, strongly supported by DFT calculations, indicate that the general cathodic path of these Group-6 organometallic
complexes is closely related to that of the intensively studied class of Mn tricarbonyl Îą-diimine complexes, themselves recently identified as important smart materials for catalytic CO2 reduction. The dimethyl substitution on the 2,2Ęš-bipyridine ligand backbone has presented new insights into this emerging class of catalysts. For the first time, the 2eâ reduced 5-coordinate anions [Mo(Ρ3-allyl)(CO)2)(x,xâ˛-dmbipy)]â were directly observed with IR SEC. The role of steric and electronic effects in determining the reduction-induced reactivity was also
investigated. For the 6,6â˛-dmbipy, the primary 1eâ reduced radical anions exert unusual stability radically changing the follow up cathodic path. The 5-coordinate anion [Mo(Ρ3-allyl)(CO)2)(6,6â˛-dmbipy)]â remains stable at low temperature in strongly coordinating butyronitrile and does not undergo dimerization at elevated temperature, in sharp contrast to reactive [Mo(Ρ3-allyl)(CO)2)(4,4â˛-dmbipy)]â that tends to dimerize in a reaction with the parent complex. The complex with the 5,5â˛-dmbipy ligand combines both types of reactivity. Under aprotic conditions, the different properties of [Mo(Ρ3-allyl)(CO)2)(x,xâ˛-dmbipy)]â are also reflected in their reactivity towards CO2. Preliminary CV and IR SEC results reveal differences in the strength of CO2 coordination at the free axial position. Catalytic waves attributed to the generation of the 5-coordinate anions were observed by CV, but only a modest catalytic performance towards the production of formate was
demonstrated by IR SEC. For 6,6â˛-dmbipy, a stronger catalytic effect was observed for the Au cathode compared to Pt
Isothiourea-catalysed acylative kinetic resolution of aryl-alkenyl (sp2 vs. sp2) substituted secondary alcohols
We would like to thank the Engineering and Physical Sciences Research Council and CRITICAT Centre for Doctoral Training [Ph.D. studentship to S.F.M.; Grant code: EP/L016419/1 and EP/J018139/1] and The Leverhulme Trust [Early Career Fellowship to J.E.T.; ECF-2014-005] for financial support. A.D.S. thanks the Royal Society for a Wolfson Merit Award.The non-enzymatic acylative kinetic resolution of challenging arylâalkenyl (sp2 vs. sp2) substituted secondary alcohols is described, with effective enantiodiscrimination achieved using the isothiourea organocatalyst HyperBTM (1â
molâ%) and isobutyric anhydride. The kinetic resolution of a wide range of arylâalkenyl substituted alcohols has been evaluated, with either electron-rich or naphthyl aryl substituents in combination with an unsubstituted vinyl substituent providing the highest selectivity (S=2â1980). The use of this protocol for the gram-scale (2.5â
g) kinetic resolution of a model arylâvinyl (sp2 vs. sp2) substituted secondary alcohol is demonstrated, giving access to >1â
g of each of the product enantiomers both in 99:1â
e.r.Publisher PDFPeer reviewe
The Report of the Intensive Survey of the Richard B. Russell Dam and Lake, Savannah River, Georgia and South Carolina
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Towards a heterogeneous mist, fog, and cloud based framework for the Internet of Healthcare Things
Rapid developments in the fields of information and communication technology and microelectronics allowed seamless interconnection among various devices letting them to communicate with each other. This technological integration opened up new possibilities in many disciplines including healthcare and well-being. With the aim of reducing healthcare costs and providing improved and reliable services, several healthcare frameworks based on Internet of Healthcare Things (IoHT) have been developed. However, due to the critical and heterogeneous nature of healthcare data, maintaining high quality of service (QoS) -in terms of faster responsiveness and data-specific complex analytics -has always been the main challenge in designing such systems. Addressing these issues, this paper proposes a five-layered heterogeneous mist, fog, and cloud based IoHT framework capable of efficiently handling and routing (near-)real-time as well as offline/batch mode data. Also, by employing software defined networking and link adaptation based load balancing, the framework ensures optimal resource allocation and efficient resource utilization. The results, obtained by simulating the framework, indicate that the designed network via its various components can achieve high QoS, with reduced end-to-end latency and packet drop rate, which is essential for developing next generation e-healthcare systems
Halo Substructure and the Power Spectrum
In this proceeding, we present the results of a semi-analytic study of CDM
substructure as a function of the primordial power spectrum. We apply our
method to several tilted models in the LCDM framework with n=0.85-1.1,
sigma_8=0.65-1.2 when COBE normalized. We also study a more extreme, warm dark
matter-like spectrum that is sharply truncated below a scale of 10^10 h^-1
Msun. We show that the mass fraction of halo substructure is not a strong
function of spectral slope, so it likely will be difficult to constrain tilt
using flux ratios of gravitationally lensed quasars. On the positive side, all
of our CDM-type models yield projected mass fractions in good agreement with
strong lensing estimates: f \sim 1.5% at M \sim 10^8 Msun. The truncated model
produces a significantly smaller fraction, f \lsim 0.3%, suggesting that warm
dark matter-like spectra may be distinguished from CDM spectra using lensing.
We also discuss the issue of dwarf satellite abundances, with emphasis on the
cosmological dependence of the map between the observed central velocity
dispersion of Milky Way satellites and the maximum circular velocities of their
host halos. In agreement with earlier work, we find that standard LCDM
over-predicts the estimated count of Milky Way satellites at fixed Vmax by an
order of magnitude, but tilted models do better because subhalos are less
concentrated. Interestingly, under the assumption that dwarfs have isotropic
velocity dispersion tensors, models with significantly tilted spectra (n \lsim
0.85, sigma_8 \lsim 0.7) may under-predict the number of large Milky Way
satellites with Vmax \gsim 40 km/s.Comment: 5 pages, 2 figures. Poster contribution to the 13th Annual
Astrophysics Conference in Maryland, The Emergence of Cosmic Structur
Review: The Journal of Dramaturgy, volume 22, issue 2
Contents include: Editor\u27s Note; Elliott Hayes Award Acceptance Speech From Denver to Gulu, With Thanks to Lynn Nottage; Learning to Speak American: A Writer\u27s Journey, Keynote Remarks Delivered at the Annual Conference of the Literary Managers and Dramturgs of the Americas, Alliance Theatre, Atlanta, GA June 28, 2012; Michael Mark Chemers\u27 Ghost Light: An Introductory Handbook for Dramaturgy; Creative Process in Theatrical Translation: An Interview with Adam Versenyi; Croisades in Quebec: On the Semiotics of Contemporary French Dramaturgie.
Issue editors: Sydney Cheek-O\u27Donnell, Debra Cardona, Janine Sobeckhttps://soundideas.pugetsound.edu/lmdareview/1044/thumbnail.jp
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