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Search Results: 1 - 10 of 449868 matches for " J. C.;Dunnett "
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Percepción del público hacia plantaciones de herbáceas ornamentales
García-Albarado, J. C.;Dunnett, N.;
Revista Chapingo. Serie horticultura , 2009,
Abstract: studies in environmental psychology in north america and western europe suggest that people of the city tend to value the contact with nature. an ecological style, naturalistic approach, might be an appropriate alternative because it promotes the minimal use of inputs in the establishment and management of planting schemes (substrates, fertilizers) it consideres species adapted to the site and it promotes widespread acceptance amoungst users. however, there is evidence of a difference in perception towards these alternatives according to age and gender of the public. therefore this research aimed to study the perceptions of users (n = 300) according to these variables into ecological and formal herbaceous plantings, both located in the main entrance of endcliffe park in sheffield, uk. thus, the professional landscape designers could consider these principles to design more sustainable plantatings with a more "democratic" sense. this could be done by considering the positive aspects of both plantings. the evaluation was done by questionnaire in site. the results indicated more positive attitudes towards the ecological planting by women and users between 31 and 60 years of age. by contrast, formal plantings were perceived more positively by men and the group of 18 to 30 and up to 61 years of age. the differences found in men and women and age may be due to cultural factors or evolutionary theories. through this study there were found positive aspects that could let to promote more sustainable planting schemes with greater acceptance by the laid public.
A spatially explicit whole-system model of the lignocellulosic bioethanol supply chain: an assessment of decentralised processing potential
Alex J Dunnett, Claire S Adjiman, Nilay Shah
Biotechnology for Biofuels , 2008, DOI: 10.1186/1754-6834-1-13
Abstract: Ethanol production costs for current technologies decrease significantly from $0.71 to $0.58 per litre with increasing economies of scale, up to a maximum single-plant capacity of 550 × 106 l year-1. The development of high-yielding energy crops and consolidated bio-processing realises significant cost reductions, with production costs ranging from $0.33 to $0.36 per litre. Increased feedstock yields result in systems of eight fully integrated plants operating within a 500 × 500 km2 region, each producing between 1.24 and 2.38 × 109 l year-1 of pure ethanol. A limited potential for distributed processing and centralised purification systems is identified, requiring developments in modular, ambient pretreatment and fermentation technologies and the pipeline transport of pure ethanol.The conceptual and mathematical modelling framework developed provides a valuable tool for the assessment and optimisation of the lignocellulosic bioethanol supply chain. In particular, it can provide insight into the optimal configuration of multiple plant systems. This information is invaluable in ensuring (near-)cost-optimal strategic development within the sector at the regional and national scale. The framework is flexible and can thus accommodate a range of processing tasks, logistical modes, by-product markets and impacting policy constraints. Significant scope for application to real-world case studies through dynamic extensions of the formulation has been identified.The penetration of biomass-derived ethanol (bioethanol) into the road transport fuels market has the potential to reduce greenhouse gas (GHG) emissions, improve fuel security, stimulate the agricultural sector and provide new markets for technology development and application. The 2006 global market for bioethanol was 20.2 million tonnes oil equivalent (mtoe), and was dominated by US and Brazilian production and consumption (45.4% and 43.9% of the total, respectively). Global growth (averaging 10.9% since 2001) has be
Phylogenetic biodiversity assessment based on systematic nomenclature
Ross H Crozier,Lisa J Dunnett,Paul-Michael Agapow
Evolutionary Bioinformatics , 2005,
Abstract: Biodiversity assessment demands objective measures, because ultimately conservation decisions must prioritize the use of limited resources for preserving taxa. The most general framework for the objective assessment of conservation worth are those that assess evolutionary distinctiveness, e.g. Genetic (Crozier 1992) and Phylogenetic Diversity (Faith 1992), and Evolutionary History (Nee & May 1997). These measures all attempt to assess the conservation worth of any scheme based on how much of the encompassing phylogeny of organisms is preserved. However, their general applicability is limited by the small proportion of taxa that have been reliably placed in a phylogeny. Given that phylogenizaton of many interesting taxa or important is unlikely to occur soon, we present a framework for using taxonomy as a reasonable surrogate for phylogeny. Combining this framework with exhaustive searches for combinations of sites containing maximal diversity, we provide a proof-of-concept for assessing conservation schemes for systematized but un-phylogenised taxa spread over a series of sites. This is illustrated with data from four studies, on North Queensland flightless insects (Yeates et al. 2002), ants from a Florida Transect (Lubertazzi & Tschinkel 2003), New England bog ants (Gotelli & Ellison 2002) and a simulated distribution of the known New Zealand Lepidosauria (Daugherty et al. 1994). The results support this approach, indicating that species, genus and site numbers predict evolutionary history, to a degree depending on the size of the data set.
Phylogenetic biodiversity assessment based on systematic nomenclature
Ross H Crozier,Lisa J Dunnett,Paul-Michael Agapow
Evolutionary Bioinformatics , 2006,
Abstract: Biodiversity assessment demands objective measures, because ultimately conservation decisions must prioritize the use of limited resources for preserving taxa. The most general framework for the objective assessment of conservation worth are those that assess evolutionary distinctiveness, e.g. Genetic (Crozier 1992) and Phylogenetic Diversity (Faith 1992), and Evolutionary History (Nee & May 1997). These measures all attempt to assess the conservation worth of any scheme based on how much of the encompassing phylogeny of organisms is preserved. However, their general applicability is limited by the small proportion of taxa that have been reliably placed in a phylogeny. Given that phylogenizaton of many interesting taxa or important is unlikely to occur soon, we present a framework for using taxonomy as a reasonable surrogate for phylogeny. Combining this framework with exhaustive searches for combinations of sites containing maximal diversity, we provide a proof-of-concept for assessing conservation schemes for systematized but un-phylogenised taxa spread over a series of sites. This is illustrated with data from four studies, on North Queensland flightless insects (Yeates et al. 2002), ants from a Florida Transect (Lubertazzi & Tschinkel 2003), New England bog ants (Gotelli & Ellison 2002) and a simulated distribution of the known New Zealand Lepidosauria (Daugherty et al. 1994). The results support this approach, indicating that species, genus and site numbers predict evolutionary history, to a degree depending on the size of the data set.
Potential cellular and regenerative approaches for the treatment of Parkinson’s disease
Emma L Lane,Olivia J Handley,Anne E Rosser,Stephen B Dunnett
Neuropsychiatric Disease and Treatment , 2008,
Abstract: Emma L Lane, Olivia J Handley, Anne E Rosser, Stephen B DunnettBrain Repair Group, School of Biosciences, Cardiff University, CF10 3US, UKAbstract: Parkinson’s disease is most commonly treated with a range of pharmacotherapeutics, with the more recent introduction of surgical techniques including deep-brain stimulation. These have limited capabilities to improve symptoms of the disease in more advanced stages, thus new therapeutic strategies including the use of viral vectors and stem cells are in development. Providing a continuous supply of dopamine to the striatum in an attempt to improve the treatment of motor symptoms using enzymes in the dopamine synthesis and machinery is one approach. Alternatively, there are tools which may serve to both protect and encourage outgrowth of surviving neurons using growth factors or to directly replace lost innervation by transplantation of primary tissue or stem cell-derived dopaminergic neurons. We summarize some of the potential therapeutic approaches and also consider the recent EU directives on practical aspects of handling viral vectors, cells and tissues, and in the running of clinical trials in Europe which impact on their development.Keywords: transplantation, viral vector, stem cells, ethics, European Union directive
Assessment of the relationship between pre-chip and post-chip quality measures for Affymetrix GeneChip expression data
Lesley Jones, Darlene R Goldstein, Gareth Hughes, Andrew D Strand, Francois Collin, Stephen B Dunnett, Charles Kooperberg, Aaron Aragaki, James M Olson, Sarah J Augood, Richard LM Faull, Ruth Luthi-Carter, Valentina Moskvina, Angela K Hodges
BMC Bioinformatics , 2006, DOI: 10.1186/1471-2105-7-211
Abstract: We found that the pre-chip variables were significantly correlated with each other but that this correlation was strongest between measures of RNA quality and cRNA yield. Post-mortem interval was negatively correlated with these variables. Four principal components, reflecting array outliers, array adjustment, hybridisation noise and RNA integrity, explain about 75% of the total post-chip measure variability. Two significant canonical correlations existed between the pre-chip and post-chip variables, derived from MAS 5.0, dChip and the Bioconductor packages affy and affyPLM. The strongest (CANCOR 0.838, p < 0.0001) correlated RNA integrity and yield with post chip quality control (QC) measures indexing 3'/5' RNA ratios, bias or scaling of the chip and scaling of the variability of the signal across the chip. Post-mortem interval was relatively unimportant. We also found that the RNA integrity number (RIN) could be moderately well predicted by post-chip measures B_ACTIN35, GAPDH35 and SF.We have found that the post-chip variables having the strongest association with quantities measurable before hybridisation are those reflecting RNA integrity. Other aspects of quality, such as noise measures (reflecting the execution of the assay) or measures reflecting data quality (outlier status and array adjustment variables) are not well predicted by the variables we were able to determine ahead of time. There could be other variables measurable pre-hybridisation which may be better associated with expression data quality measures. Uncovering such connections could create savings on costly microarray experiments by eliminating poor samples before hybridisation.Conducting microarray experiments using Affymetrix arrays is expensive. The quality of the starting material, for instance human post-mortem tissues, is often predetermined and samples may be scarce, leading to variable quality of the extracted RNA. We set out to explore the relationship between quality control (QC) varia
Scale effects in necking
Dunnett T.,Balint D.,MacGillivray H.,Church P.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20122601008
Abstract: Geometrically similar specimens spanning a scale range of 100:1 are tested quasi-statically to failure. Images of neck development are acquired using optical means for large specimens, and in-situ scanning electron microscope testing for small specimens, to examine the dependence of neck geometry on a broad range of specimen sizes. Size effects typically arise when the smallest specimen dimension is on the order of a microstructural length (e.g. grain size, dislocation mean free path, etc.), or in the presence of significant plastic strain gradients, which increase the density of geometrically necessary dislocations. This study was carried out for the purpose of investigating scale dependence in models used for predicting dynamic deformation and damage to very high strains for ballistic impact applications, such as the Goldthorpe path-dependent failure model, which includes temperature and strain-rate dependence but does not account for specimen size or a dependence on microstructural lengths. Although the experiments show that neck geometry does not exhibit a clear dependence on specimen size across the range of length scales tested, the statistical variation due to microstructural variations was found to increase monotonically with decreasing size, becoming significant for the smallest (0.35 mm diameter) size, allowing a limit to be identified for reliable model calibration.
A Comparison of Sufficiency Condtions for the Goldbach and the Twin Primes Conjectures  [PDF]
C. J. Mozzochi
Advances in Pure Mathematics (APM) , 2014, DOI: 10.4236/apm.2014.45021
Abstract:

It is generally known that under the generalized Riemann hypothesis one could establish the twin primes conjecture by the circle method, provided one could obtain the estimate o (nlog-2 n) for the integral of the representation function over the minor arcs. One of the new results here is that the assumption of GRH can be removed. We compare this and other such sufficiency results with similar results for the Goldbach conjecture.

Using Microgripper in Development of Automatic Adhesive Glue Transferring and Binding Microassembly System  [PDF]
R. J. CHANG, C. C. CHEN
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.21001
Abstract: A system using microgripper for gluing and adhesive bonding in automatic microassembly was designed, implemented, and tested. The development of system is guided by axiomatic design principle. With a compliant PU microgripper, regional-edge-statistics (RES) algorithm, and PD controller, a visual-servoing system was implemented for gripping micro object, gluing adhesive, and operating adhesive bonding. The RES algorithm estimated and tracked a gripper’s centroid to implement a visual-servoing control in the microassembly operation. The main specifications of the system are: gripping range of 60~80μm, working space of 7mm×5.74mm×15mm, system bandwidth of 15Hz. In the performance test, a copper rod with diameter 60μm was automatically gripped and transported for transferring glue and bonding. The 60μm copper rod was dipped into a glue container and moved, pressed and bonding to a copper rod of 380μm. The amount of binding glue was estimated about 5.7nl.
The evaluation of gold contacts
J. C. C.
Gold Bulletin , 1972, DOI: 10.1007/BF03215170
Abstract: The International Conferences on Electric Contact Phenomena organised by the Illinois Institute of Technology have become an annual feature in their field. At the sixth meeting, held in Chicago in June, a number of papers were concerned with the design and performance of gold contacts and the evaluation of testing methods.
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