123 research outputs found
Low-head hydropower as a reserve power source for wind power
No full textWind power generation faces intermittency challenges, typically requiring reserve power generation sources burning fossil fuels to maintain reliability of the electricity grid in the event of a decrease in wind. This study proposes an alternative hypothesis: that hydropower turbines installed at low-head dams can provide similar reserve power generation to support wind, thereby avoiding the externalities associated with fossil-fuel plants and conventional hydropower. Low-head dams, common across the United States, are used for flood control, securing municipal water supplies, and providing ample water depth for recreation. As a case study, hydropower potential at 13 such dams along a 150-kilometer reach of the Fox River (Northeastern Illinois, USA) was estimated using a HEC-RAS model calibrated with U.S. Geological Survey data. The output of the model was then analyzed to determine the capacity of the system and gauge its reliability both as a standalone generator and as a component in a coupled wind-hydropower system. Findings revealed that economic, environmental, and regulatory factors all affected the implementation of this low-head hydropower system. The system was found to perform reliably over a five-year time period in spite of significant long-term fluctuations in streamflow, thereby enabling it to offset the short-term variability of wind power. However, combining the low-head hydropower system with wind power limits the reliable output of the entire system to the lowest amount of power generated by the low-head hydropower system, regardless of how much wind power is deployed. The low-head hydropower system's relatively small capacity and inauspicious cost-benefit ratio suggest that this low-head hydropower system would be best suited for local applications rather than grid-scale operations, especially if environmental and regulatory considerations are included.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01The student, Trevor Auth, accepted the attached license on 2019-04-19 at 17:04.The student, Trevor Auth, submitted this Thesis for approval on 2019-04-19 at 17:11.This Thesis was approved for publication on 2019-04-22 at 16:27.DSpace SAF Submission Ingestion Package generated from Vireo submission #13795 on 2019-08-22 at 15:07:35Made available in DSpace on 2019-08-23T20:36:05Z (GMT). No. of bitstreams: 2
AUTH-THESIS-2019.pdf: 4928113 bytes, checksum: 5607561ed5f7181acff3cb7c7d2fb6a9 (MD5)
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Previous issue date: 2019-04-22Embargo set by: Seth Robbins for item 112185
Lift date: 2021-08-23T20:36:18Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 112185 on 2021-08-24T09:15:24Z
Transcript-specific expression profiles derived from sequence-based analysis of standard microarrays
No full textBackground: Alternative mRNA processing mechanisms lead to multiple transcripts (i.e. splice isoforms) of a given gene
which may have distinct biological functions. Microarrays like Affymetrix GeneChips measure mRNA expression of genes
using sets of nucleotide probes. Until recently probe sets were not designed for transcript specificity. Nevertheless, the reanalysis of established microarray data using newly defined transcript-specific probe sets may provide information about expression levels of specific transcripts.
Methodology/Principal Findings: In the present study alignment of probe sequences of the Affymetrix microarray HGU133A with Ensembl transcript sequences was performed to define transcript-specific probe sets. Out of a total of 247,965 perfect match probes, 95,008 were designated ‘‘transcript-specific’’, i.e. showing complete sequence alignment, no crosshybridization, and transcript-, not only gene-specificity. These probes were grouped into 7,941 transcript-specific probe sets and 15,619 gene-specific probe sets, respectively. The former were used to differentiate 445 alternative transcripts of 215
genes. For selected transcripts, predicted by this analysis to be differentially expressed in the human kidney, confirmatory real-time RT-PCR experiments were performed. First, the expression of two specific transcripts of the genes PPM1A (PP2CA_HUMAN and P35813) and PLG (PLMN_HUMAN and Q5TEH5) in human kidneys was determined by the transcriptspecific array analysis and confirmed by real-time RT-PCR. Secondly, disease-specific differential expression of single transcripts of PLG and ABCA1 (ABCA1_HUMAN and Q5VYS0_HUMAN) was computed from the available array data sets and confirmed by transcript-specific real-time RT-PCR.
Conclusions: Transcript-specific analysis of microarray experiments can be employed to study gene-regulation on the
transcript level using conventional microarray data. In this study, predictions based on sufficient probe set size and foldchange are confirmed by independent mean
An aging world - growing old in developing countries. The Courier No. 176, July/August 1999
No full text
Uma solução de autenticação fim a fim para o LDP (Label Distribution Protocol)
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Ciência da Computação.Este trabalho propõe uma solução de autenticação para o protocolo LDP (Label Distribution Protocol) que tem por objetivo autenticar, em um escopo fim a fim, o estabelecimento de um LSP (Label Switching Path) entre um LSR (Label Switching Router) de Ingresso e o seu respectivo LSR de Egresso. Objetiva-se suprir a deficiência do protocolo LDP de não possuir um mecanismo de autenticação fim a fim definido, aplicável entre LSRs não-adjacentes. Conforme foi verificado pelo levantamento de trabalhos correlatos, atualmente é desconhecida uma solução de autenticação semelhante, que efetivamente atenda o propósito de autenticar num escopo fim a fim, o estabelecimento de LSPs no protocolo LDP. Dessa forma a solução deste trabalho é inédita no seu escopo de aplicação. A solução foi planejada para ambientes onde LSPs atravessam múltiplos domínios externos, não confiáveis entre si, e que por isso necessitam de um mecanismo de autenticação durante o estabelecimento dos LSPs. A solução faz uso de um mecanismo de autenticação, baseado em criptografia assimétrica (chave pública e privada), anexado a cada mensagem LDP. Este mecanismo possibilita ao LSR receptor verificar e autenticar o originador da mensagem LDP. Adicionalmente a solução provê integridade de dados através de um mecanismo de resumo de mensagens (hash) e também protege contra ataques de repetição através da inserção de um nonce às mensagens LDP
Detailed results for the analysis of the fMRI simulation database, the ID numbers refer to the references in Table S1.
No full text<p>ID - paper identification number; Auth. - first author; dim. - data dimension; nS - Multiple subjects?</p><p>rep - Number of replications; parV - Parameter variation?; parJ - Parameter justification; HRFm - HRF model; HRFv - HRF variation?; Noise corr. - Noise correlations.</p
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