University of New Brunswick

About: University of New Brunswick is a education organization based out in Fredericton, New Brunswick, Canada. It is known for research contribution in the topics: Population & Context (language use). The organization has 10498 authors who have published 20654 publications receiving 474448 citations.

(Gas-)liquid-solid circulating fluidized beds and their potential applications to bioreactor engineering

Abstract: Compared with conventional fluidized beds, circulating fluidized beds have many advantages including better interfacial contacting and reduced backmixing (Lim et al, 1995) While there are many reports on the gas—solid circulating fluidized systems, liquid—solid and gas—liquid—solid circulating fluidized bed systems have been scantily studied However, extending current knowledge obtained in gas—solid systems to liquid—solids and gas—liquid—solid three-phase systems is shown to open new horizons for applications of circulating fluidized bed technology and expected to lead to the development of highly efficient liquid—solid and gas—liquid—solid reactors, especially for the ever growing field of biotechnology In order to fully appreciate the potential of those two types of liquid phase circulating fluidized beds, recent progress is reviewed in this article Their potential applications to biochemical processes are also discussed Comparativement aux lits fluidises classiques, les lits fluidises circulants offrent de nombreux avantages, dont un meilleur contact interfacial et un retromelange reduit (Lim et al, 1995) Bien qu'un nombre important d'articles paraissent sur les systemes fluidises circulants gaz—solide, les systemes a lits fluidises circulants liquide—solide et gaz—liquide—solide ont fait l'objet de peu d'etudes On montre cependant que l'utilisation des connaissances actuelles sur les systemes gaz—solide pour les etendre aux systemes liquide—solides et aux systemes triphasiques gaz—liquide—solide ouvre de nouveaux horizons a l'application de la technologie du lit fluidise circulant et devrait permettre le developpement de reacteurs liquide—solide et gaz—liquide—solide hautement efficaces, en particulier pour le secteur de la biotechnologie toujours en croissance Afin d'apprecier pleinement le potentiel de ces deux types de lits fluidises circulants en phase liquide, les derniers progres en la matiere sont passes en revue dans cet article Leurs applications potentielles aux procedes biochimiques sont egalement examinees

Routine DNA barcoding of Canadian Gracilariales (Rhodophyta) reveals the invasive species Gracilaria vermiculophylla in British Columbia.

Abstract: As part of an extensive DNA-based floristic survey of marine macroalgae in Canadian waters, an unexpected sequence for a Gracilaria sp. was generated from British Columbia. Before further molecular analyses and corresponding morphological/anatomical observations this mystery sequence was temporarily entered into our database as Gracilaria BCsp. Continued sampling uncovered this species from four additional locations. A timely collaboration with international colleagues introduced sequences from the invasive Gracilaria vermiculophylla into our cytochrome c oxidase I alignments — these a perfect match to BCsp indicating that this species occurs in British Columbia. A discussion of the origin of this taxon in Canadian waters, whether natural or introduced, is provided.

Homoleptic Rare‐Earth Metal(III) Tetramethylaluminates: Structural Chemistry, Reactivity, and Performance in Isoprene Polymerization

Abstract: The complexes [Ln(AlMe 4 ) 3 ] (Ln=Y, La, Ce, Pr, Nd, Sm, Ho, Lu) have been synthesized by an amide elimination route and the structures of [Lu{(μ-Me) 2 AlMe 2 } 3 ], [Sm{(μ-Me) 2 -AlMe 2 } 3 ], [Pr{(μ-Me) 2 AlMe 2 } 3 ], and [La((μ-Me) 2 AlMe 2 } 2 {(μ-Me) 3 AlMe}] determined by X-ray crystallography. These structures reveal a distinct Ln 3+ cation size-dependency. A comprehensive insight into the intrinsic properties and solution coordination phenomena of [Ln(AlMe 4 ) 3 ] complexes has been gained from extended dynamic 1 H and 13 C NMR spectroscopic studies, as well as 1D 89 Y, 2D 1 H/ 89 Y, and 27 Al NMR spectroscopic investigations. [Ce-(AlMe 4 ) 3 ] and [Pr(AlMe 4 ) 3 ] have been used as alkyl precursors for the synthesis of heterobimetallic alkylated rare-earth metal complexes. Both carboxylate and siloxide ligands can be introduced by methane elimination reactions that give the heterobimetallic complexes [Ln{(O 2 CAr iPr )2(μ-AlMe 2 )} 2 -(AlMe 4 )(C 6 H 14 ) n ) and [Ln{OSi-(OtBu) 3 }(AlMe3)(AlMe4)2], respectively. [Pr{OSi(OtBu)3}(AlMe3)(AlMe4)2] has been characterized by X-ray structure analysis. All of the cerium and praseodymium complexes are used as precatalysts in the stereospecific polymerization of isoprene (1-3 equivalents of Et 2 AlCl as co-catalyst) and compared to the corresponding neodymium-based initiators reported previously. The superior catalytic performance of the homoleptic complexes leads to quantitative yields of high-cis-1,4-polyisoprene (>98%) in almost all of the polymerization experiments. In the case of the binary catalyst mixtures derived from carboxylate or siloxide precatalysts quantitative formation of polyisoprene is only observed for n Ln :n Cl = 1:2. The influence of the metal size is illustrated for the heterobimetallic lanthanum, cerium, praseodymium, neodymium, and gadolinium carboxylate complexes, and the highest activities are observed for praseodymium as a metal center in the presence of one equivalent of Et 2 AlCl.

Auction-Based Resource Allocation for Sharing Cloudlets in Mobile Cloud Computing

Abstract: Driven by pervasive mobile devices and ubiquitous wireless communication networks, mobile cloud computing emerges as an appealing paradigm to accommodate demands for running power-hungry or computation-intensive applications over resource-constrained mobile devices. Cloudlets that move available resources closer to the network edge offer a promising architecture to support real-time applications, such as online gaming and speech recognition. To stimulate service provisioning by cloudlets, it is essential to design an incentive mechanism that charges mobile devices and rewards cloudlets. Although auction has been considered as a promising form for incentive, it is challenging to design an auction mechanism that holds certain desirable properties for the cloudlet scenario. In this paper, we propose an incentive-compatible auction mechanism (ICAM) for the resource trading between the mobile devices as service users (buyers) and cloudlets as service providers (sellers). ICAM can effectively allocate cloudlets to satisfy the service demands of mobile devices and determine the pricing. Both the theoretical analysis and the numerical results show that the ICAM guarantees desired properties with respect to individual rationality, budget balance and truthfulness (incentive compatibility) for both the buyers and the sellers, and computational efficiency.