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Academic literature on the topic 'TCE-a'

Author: Grafiati
Published: 9 March 2023
Last updated: 10 March 2023

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Journal articles on the topic "TCE-a"

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Magnuson, Jon K., Margaret F. Romine, David R. Burris, and Mark T. Kingsley. "Trichloroethene Reductive Dehalogenase fromDehalococcoides ethenogenes: Sequence of tceA and Substrate Range Characterization." Applied and Environmental Microbiology 66, no. 12 (December 1, 2000): 5141–47. http://dx.doi.org/10.1128/aem.66.12.5141-5147.2000.

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ABSTRACT The anaerobic bacterium Dehalococcoides ethenogenes is the only known organism that can completely dechlorinate tetrachloroethene or trichloroethene (TCE) to ethene via dehalorespiration. One of two corrinoid-containing enzymes responsible for this pathway, TCE reductive dehalogenase (TCE-RDase) catalyzes the dechlorination of TCE to ethene. TCE-RDase dehalogenated 1,2-dichloroethane and 1,2-dibromoethane to ethene at rates of 7.5 and 30 μmol/min/mg, respectively, similar to the rates for TCE,cis-dichloroethene (DCE), and 1,1-DCE. A variety of other haloalkanes and haloalkenes containing three to five carbon atoms were dehalogenated at lower rates. The gene encoding TCE-RDase,tceA, was cloned and sequenced via an inverse PCR approach. Sequence comparisons of tceA to proteins in the public databases revealed weak sequence similarity confined to the C-terminal region, which contains the eight-iron ferredoxin cluster binding motif, (CXXCXXCXXXCP)2. Direct N-terminal sequencing of the mature enzyme indicated that the first 42 amino acids constitute a signal sequence containing the twin-arginine motif, RRXFXK, associated with the Sec-independent membrane translocation system. This information coupled with membrane localization studies indicated that TCE-RDase is located on the exterior of the cytoplasmic membrane. Like the case for the two other RDases that have been cloned and sequenced, a small open reading frame, tceB, is proposed to be involved with membrane association of TCE-RDase and is predicted to be cotranscribed with tceA.
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Zhang, Kegang, Xiaodong Wang, Xiaohui Zhang, and Shengjie Peng. "Degradation of Trichloroethylene in Groundwater Using Iron Catalyzed Calcium Peroxide Systems." E3S Web of Conferences 143 (2020): 02046. http://dx.doi.org/10.1051/e3sconf/202014302046.

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The application of calcium peroxide (CaO2) activated with ferrous ion chelate sodium citrate （TCD）to stimulate the degradation of trichloroethylene (TCE) was investigated. The experimental results show that the removal efficiency of TCE increases first and then decreases with the increase of CaO2 and Na2S2O8 dosage; the chelation ratio of Fe(II)/TCD, too much or too little, will affect the removal efficiency of TCE; when the molar ratio of CaO2/ Fe(II)/ TCD/ TCE is 18/6/6/1, the removal efficiency of TCE is the highest, reaching 97.99% within 200Min. The results demonstrated that the technique of CaO2 activated with ferrous ion is a highly promising technique in in situ chemical oxidation (ISCO) remediation in TCE contaminated sites.
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Bal, C., M. Büyükşekerci, C. Koca, ER Ağış, S. Erdoğan, P. Baran, M. Gündüzöz, and ÖH Yilmaz. "The compromise of dynamic disulfide/thiol homeostasis as a biomarker of oxidative stress in trichloroethylene exposure." Human & Experimental Toxicology 35, no. 9 (July 11, 2016): 915–20. http://dx.doi.org/10.1177/0960327115608928.

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In this study, we aimed to investigate disulfide/thiol homeostasis in trichloroethylene (TCE) exposure. The study was carried out in 30 nonsmoker TCE-exposed workers with a variety of occupations. Additionally, 30 healthy nonsmoker volunteers were recruited as the control group. TCE exposure was determined by measuring urinary trichloroacetic acid (TCA) concentration. Median urinary TCA levels of exposed workers (20.5 mg/L) were significantly higher than control subjects (5 mg/L). Thiol and disulfide concentrations were determined using a novel automated method. Disulfide/thiol ratio was significantly higher in the exposed group ( p < 0.001). Thiol/disulfide homeostasis was found to be disturbed in TCE-exposed workers. We predict that in TCE-exposed workers this disturbance can be a therapeutic target, and the efficiency of the treatment can easily be monitored by the novel method we used.
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Shaw, Bronwen E., Katharina Fleischhauer, Mari Malkki, Theodore Gooley, Elisabetta Zino, Stephen Spellman, Yasuo Morishima, et al. "Permissive HLA-DPB1 Mismatching Compared to a Non-Permissive Mismatching Significantly Improves Overall Survival Following Allogeneic Transplantation In Patients with Both 10/10 and 9/10 Matched Unrelated Donors." Blood 116, no. 21 (November 19, 2010): 227. http://dx.doi.org/10.1182/blood.v116.21.227.227.

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Abstract Abstract 227 It is well established that the use of a donor matched for 9–10/10 alleles at HLA-A,-B,-C,-DRB1,-DQB1 significantly improves overall survival (OS) after unrelated donor (UD) haematopoietic stem cell transplantation (HSCT). Whilst the matching status for HLA-DPB1 alleles has been shown to influence transplant complications (relapse and graft-versus-host disease (GVHD), its impact on survival has not been well defined. The current unmet need in clinical practice is an approach to stratify selection criteria when a clinician is confronted with the choice between several 10/10 or 9/10 matched unrelated donors. There is now considerable interest in exploring different types of matching criteria to define permissive HLA-DPB1 mismatches which may be associated with an improved outcome. We have previously shown that HLA-DPB1 permissiveness can be functionally defined by the characterization of shared T cell epitopes (TCE) recognized by alloreactive T cells. In this model, allelic HLA mismatches are classified as permissive if they do not involve TCE disparities, and as non-permissive if they do. Using this concept, we developed two overlapping algorithms of permissivity for allelic HLA-DPB1 mismatches, on the basis of 3 (TCE3) or 4 (TCE4) groups of DPB1 alleles encoding immunogenic TCE. Data from relatively small prospective studies has shown a worse outcome to be associated with non-permissive DPB1 TCE disparities. Here, we present outcomes in 9123 UD-HSCT pairs, collected through the International Histocompatibility Working Group (IHWG). The cohort was comprised of 5809 10/10 matched transplant pairs and 3314 9/10 matched pairs. Within the 10/10 and 9/10 matched pairs three groups of patients were identified: 1. Zero DPB1 mismatches (i.e. allele matched), 2. Permissive DPB1 mismatch, 3. Non-permissive DPB1 mismatch. The model was adjusted for disease severity, source of stem cells, conditioning regimen, use of T-cell depletion, patient/donor gender and patient age. In line with DPB1 allele frequencies in worldwide populations, the number of transplants scored as permissive was higher for TCE3 (4398/7270 [60.4%]) than for TCE4 (2577/7270 [35.4%]). Using the DPB1 permissive mismatch transplants as the reference group (either 10/10 or 9/10 matched), we showed that DPB1 allelic matches resulted in similar survivals to DPB1 permissive mismatches, both in the 10/10 (HR 0.96, p=0.498 for TCE3 and HR 0.99, p=0.85 for TCE4) and the 9/10 setting (HR 0.97, p=0.70 for TCE3 and HR 0.99, p=0.96 for TCE4). In contrast, survival was significantly worse in the presence of a non-permissive TCE3 or TCE4 mismatch, both in the 10/10 (HR 1.15, p=0.0005 for TCE3 and HR 1.13, p=0.0035 for TCE4) and in the 9/10 matched setting (HR 1.13, p=0.0140 for TCE3 and HR 1.11, p=0.0448 for TCE4). The survival detriment appeared to be due to a significantly increased non-relapse mortality (TCE3: 10/10 HR 1.27, p<0.001 and 9/10 HR 1.21, p=0.0001; TCE4: 10/10 HR 1.24, p<0.001 and 9/10 HR 1.13, p=0.0514), as well as an increase in grades II-IV acute GVHD (TCE3: 10/10 HR 1.17, p<0.001 and 9/10 HR 1.29, p<0.001; TCE4: 10/10 HR 1.12, p=0.0035 and 9/10 HR 1.19, p<0.0001). There was no significant difference in disease relapse between permissive and non-permissive mismatched pairs. Finally, using the 10/10 DPB1 permissive mismatched group as a reference, we found survival to be similar for 10/10 DPB1 non-permissive (HR 1.15) and 9/10 DPB1 permissive (HR 1.20) or DPB1 allele matched (HR 1.17) transplants. In conclusion, our results suggest that extending donor selection to include HLA-DPB1 both allelic and functional TCE matching may result in better prediction of survival for patients. These findings provide an attractive new algorithm to stratify donor choice when several well-matched UD are identified. Disclosures: No relevant conflicts of interest to declare.
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Lee, Patrick K. H., David R. Johnson, Victor F. Holmes, Jianzhong He, and Lisa Alvarez-Cohen. "Reductive Dehalogenase Gene Expression as a Biomarker for Physiological Activity of Dehalococcoides spp." Applied and Environmental Microbiology 72, no. 9 (September 2006): 6161–68. http://dx.doi.org/10.1128/aem.01070-06.

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ABSTRACT This study characterizes the transcriptional expression of the reductive dehalogenase (RDase)-encoding tceA and vcrA genes and evaluates their applicability as potential biological markers of Dehalococcoides activity. When Dehalococcoides ethenogenes 195 was provided with trichloroethene (TCE) as the electron acceptor, the expression of the tceA gene increased by 90-fold relative to that in cells starved of chlorinated ethenes, demonstrating that tceA gene expression is indicative of the active physiological state of this strain. In a Dehalococcoides-containing enrichment culture that contains both the tceA and vcrA genes, the tceA gene was up-regulated in response to TCE and cis-1,2-dichloroethene (cDCE) exposure, while the vcrA gene was up-regulated in response to TCE, cDCE, and vinyl chloride (VC). When chlorinated ethenes were depleted, the RDase-encoding gene transcripts decayed exponentially, with a half-life between 4.8 and 6.1 h, until they reached a stable background level after 2 days. We found that while gene expression correlated generally to the presence of chlorinated ethenes, there was no apparent direct relationship between RDase-encoding transcript numbers and respective rates of TCE, cDCE, and VC dechlorination activities. However, elevated tceA and vcrA expression did correlate with chlorinated-ethene reduction beyond cDCE, suggesting that elevated RDase-encoding transcript numbers could serve as a biomarker for the physiological ability of Dehalococcoides spp. to dechlorinate beyond cDCE.
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Hohmann, Uwe, Winfried Busch, Katia Badaeva, Bernd Friebe, and Bikram S. Gill. "Molecular cytogenetic analysis of Agropyron chromatin specifying resistance to barley yellow dwarf virus in wheat." Genome 39, no. 2 (April 1, 1996): 336–47. http://dx.doi.org/10.1139/g96-044.

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Nine families of bread wheat (TC5, TC6, TC7, TC8, TC9, TC10, TC14, 5395-(243AA), and 5395) with resistance to barley yellow dwarf virus and containing putative translocations between wheat and a group 7 chromosome of Agropyron intermedium (L1 disomic addition line, 7Ai#1 chromosome) induced by homoeologous pairing or tissue culture were analyzed. C-banding, genomic in situ hybridization (GISH), and restriction fragment length polymorphism (RFLP) in combination with repetitive Agropyron-specific sequences and deletion mapping in wheat were used to determine the relative locations of the translocation breakpoints and the size of the transferred alien chromatin segments in hexaploid wheat–Agropyron translocation lines. All homoeologous compensating lines had complete 7Ai#1 or translocated 7Ai#1–7D chromosomes that substitute for chromosome 7D. Two complete 7Ai#1 (7D) substitution lines (5395-(243AA) and 5395), one T1BS–7Ai#1S∙7Ai#1L addition line (TC7), and two different translocation types, T7DS–7Ai#1S∙7Ai#1L (TC5, TC6, TC8, TC9, and TC10) and T7DS∙7DL–7Ai#1L (TC14), substituting for chromosome 7D were identified. The substitution line 5395-(243AA) had a reciprocal T1BS∙1BL–4BS/T1BL–4BS∙4BL translocation. TC14 has a 6G (6B) substitution. The RFLP data from deletion mapping studies in wheat using 37 group 7 clones provided 10 molecular tagged chromosome regions for homoeologous and syntenic group 7 wheat or Agropyron chromosomes. Together with GISH we identified three different sizes of the transferred Agropyron chromosome segments with approximate breakpoints at fraction length (FL) 0.33 in the short arm of chromosome T7DS–7Ai#1S∙7Ai#1L (TC5, TC6, TC8, TC9, and TC10) and another at FL 0.37 of the nonhomoeologous translocated chromosome T1BS–7Ai#1S∙7Ai#1L (TC7). One breakpoint was identified in the long arm of chromosome T7DS∙7DL–7Ai#1L (TC14) at FL 0.56. We detected some nonreciprocal translocations for the most proximal region of the chromosome arm of 7DL, which resulted in small duplications. Key words : C-banding, genomic in situ hybridization (GISH), physical mapping, translocation mapping, RFLP analysis.
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7

Fisher, Jeffrey W., Stephen R. Channel, Jeffrey S. Eggers, Paula D. Johnson, Kathleen L. MacMahon, Chuck D. Goodyear, Gregory L. Sudberry, D. Alan Warren, John R. Latendresse, and Linda J. Graeter. "Trichloroethylene, Trichloroacetic Acid, and Dichloroacetic Acid: Do They Affect Fetal Rat Heart Development?" International Journal of Toxicology 20, no. 5 (September 2001): 257–67. http://dx.doi.org/10.1080/109158101753252992.

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Trichloroethylene (TCE), trichloroacetic acid (TCA), and dichloroacetic acid (DCA) are commonly found as groundwater contaminants in many regions of the United States. Cardiac birth defects in children have been associated with TCE, and laboratory studies with rodents report an increased incidence of fetal cardiac malformations resulting from maternal exposures to TCE, TCA, and DCA. The objective of this study was to orally treat pregnant CDR(CD) Sprague-Dawley rats with large bolus doses of either TCE (500 mg/kg), TCA (300 mg/kg), or DCA (300 mg/kg) once per day on days 6 through 15 of gestation to determine the effectiveness of these materials to induce cardiac defects in the fetus. All- trans retinoic acid (RA) dissolved in soybean oil was used as a positive control. Soybean oil is commonly used as a dosing vehicle for RA teratology studies and was also used in this study as a dosing vehicle for TCE. Water was used as the dosing vehicle for TCA and DCA. Fetal hearts were examined on gestation day (GD) 21 by an initial in situ, cardiovascular stereomicroscope examination, and then followed by a microscopic dissection and examination of the formalin-fixed heart. The doses selected for TCA and DCA resulted in a modest decrease in maternal weight gain during gestation (3% to 8%). The fetal weights on GD 21 in the TCA and DCA treatment groups were decreased 8% and 9%, respectively, compared to the water control group and 21% in the RA treatment group compared to soybean oil control group. The heart malformation incidence for fetuses from the TCE-, TCA-, and DCA-treated dams did not differ from control values on a per fetus or per litter basis. The rate of heart malformations, on a per fetus basis, ranged from 3% to 5% for TCE, TCA, and DCA treatment groups compared to 6.5% and 2.9% for soybean oil and water control groups. The RA treatment group was significantly higher with 33% of the fetuses displaying heart defects. For TCE, TCA, and DCA treatment groups 42% to 60% of the litters contained at least one fetus with a heart malformation, compared to 52% and 37% of the Utters in the soybean oil and water control groups. For the RA treatment group, 11 of 12 litters contained at least one fetus with a heart malformation. Further research is needed to quantify the spontaneous rates of heart defects for vehicle control rats and to explain the disparity between findings in the present study and other reported findings on the fetal cardiac teratogenicity of TCE, TCA, and DCA.
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Yoshida, M., S. Fukabori, K. Hara, H. Yuasa, K. Nakaaki, Y. Yamamura, and K. Yoshida. "Concentrations of trichloroethylene and its metabolites in blood and urine after acute poisoning by ingestion." Human & Experimental Toxicology 15, no. 3 (March 1996): 254–58. http://dx.doi.org/10.1177/096032719601500312.

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A 58-year-old man fell into a trichloroethylene reservoir bath head first, during a maintenance degreasing bath and accidentally ingested the solvent. Although he showed deep coma, chemical burns and pneumonia on admission, these symptoms gradually subsided. The concentrations of trichloroethylene (TRI) and its metabolites, trichloroethanol (TCE) and trichloroacetic acid (TCA) in blood and urine were measured during hospitalization. Eight hours after the accident, the concentrations ofTRI and its metabolites in serum were 31.4 μ g/ml TRI, 16.5 μg/ ml TCE and 79.5 μg/ml TCA. The serum TRI concentration decreased to 4.3 μg/ml on the following day. Elimination of TCE and TCA from serum occurred biphasically, the estimated half-lives of each metabolites being about 52.6 and 50.4 h in an initial fast phase and 268.3 and 277.2 h in a subsequent slow phase, respectively. Urinary TRI excretion persisted for the first 2 days. The urinary TCE and TCA excretions were longer than that of TRI with a biphasic decrease and the total amount of TCE excreted during the first 2 days was about two times that of TCA. The half-life of urinary TCE excretion (t½ 25.7 h) was shorter than that of TCA (t½ 52.1 h) in the fast phase but did no difference during the slow phase, with each half-time being about 166.3 h. The kinetics of TRI metabolites in blood and urine in this case were in slight agreement with the results following inhalation exposure previously reported in the literature.
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Grostern, Ariel, and Elizabeth A. Edwards. "A 1,1,1-Trichloroethane-Degrading Anaerobic Mixed Microbial Culture Enhances Biotransformation of Mixtures of Chlorinated Ethenes and Ethanes." Applied and Environmental Microbiology 72, no. 12 (October 20, 2006): 7849–56. http://dx.doi.org/10.1128/aem.01269-06.

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ABSTRACT 1,1,1-Trichloroethane (1,1,1-TCA) is a common groundwater pollutant as a result of improper disposal and accidental spills. It is often found as a cocontaminant with trichloroethene (TCE) and inhibits some TCE-degrading microorganisms. 1,1,1-TCA removal is therefore required for effective bioremediation of sites contaminated with mixed chlorinated organics. This study characterized MS, a 1,1,1-TCA-degrading, anaerobic, mixed microbial culture derived from a 1,1,1-TCA-contaminated site in the northeastern United States. MS reductively dechlorinated 1,1,1-TCA to 1,1-dichloroethane (1,1-DCA) and then to monochloroethane (CA) but not further. Cloning of bacterial 16S rRNA genes revealed among other organisms the presence of a Dehalobacter sp. and a Desulfovibrio sp., which are both phylogenetically related to known dehalorespiring strains. Monitoring of these populations with species-specific quantitative PCR during degradation of 1,1,1-TCA and 1,1-DCA showed that Dehalobacter proliferated during dechlorination. Dehalobacter growth was dechlorination dependent, whereas Desulfovibrio growth was dechlorination independent. Experiments were also performed to test whether MS could enhance TCE degradation in the presence of inhibiting levels of 1,1,1-TCA. Dechlorination of cis-dichloroethene (cDCE) and vinyl chloride (VC) in KB-1, a chloroethene-degrading culture used for bioaugmentation, was inhibited with 1,1,1-TCA present. When KB-1 and MS were coinoculated, degradation of cDCE and VC to ethene proceeded as soon as the 1,1,1-TCA was dechlorinated to 1,1-DCA by MS. This demonstrated the potential application of the MS and KB-1 cultures for cobioaugmentation of sites cocontaminated with 1,1,1-TCA and TCE.
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Fung, Jennifer M., Robert M. Morris, Lorenz Adrian, and Stephen H. Zinder. "Expression of Reductive Dehalogenase Genes in Dehalococcoides ethenogenes Strain 195 Growing on Tetrachloroethene, Trichloroethene, or 2,3-Dichlorophenol." Applied and Environmental Microbiology 73, no. 14 (May 18, 2007): 4439–45. http://dx.doi.org/10.1128/aem.00215-07.

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ABSTRACT Reductive dehalogenase (RD) gene transcript levels in Dehalococcoides ethenogenes strain 195 were investigated using reverse transcriptase quantitative PCR during growth and reductive dechlorination of tetrachloroethene (PCE), trichloroethene (TCE), or 2,3-dichlorophenol (2,3-DCP). Cells grown with PCE or TCE had high transcript levels (greater than that for rpoB) for tceA, which encodes the TCE RD, pceA, which encodes the PCE RD, and DET0162, which contains a predicted stop codon and is considered nonfunctional. In cells grown with 2,3-DCP, tceA mRNA was less than 1% of that for rpoB, indicating that its transcription was regulated. pceA and DET0162 were the only RD genes with high transcript levels in cells grown with 2,3-DCP. Proteomic analysis of PCE-grown cells detected both PceA and TceA with high peptide coverage but not DET0162, and analysis of 2,3-DCP-grown cells detected PceA with high coverage but not TceA, DET0162, or any other potential RD. Cells grown with PCE or 2,3-DCP were tested for the ability to dechlorinate PCE, TCE, or 2,3-DCP with H2 as the electron donor. 2,3-DCP-grown cells were unable to dechlorinate TCE but dechlorinated PCE to TCE without a lag, and PCE-grown cells dechlorinated 2,3-DCP without a lag. These results show that 2,3-DCP-grown cells do not produce TceA and that DET0162 is transcribed but its translation product is not detectable in cells and are consistent with PceA's being bifunctional, also serving as the 2,3-DCP RD. Chlorophenols naturally occur in soils and are good candidates for the original substrates for PceA.
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Dissertations / Theses on the topic "TCE-a"

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Brown, Jillian. "Bacterial community composition, TCE degradation, isotopic fractionation and toxicity of a TCE contaminated aquifer." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=33520.

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Menezes, Filho Carlos. "A influência da Escola de Contas e Gestão do TCE na percepção da mudança da imagem da marca do TCE: a percepção dos servidores." reponame:Repositório Institucional do FGV, 2008. http://hdl.handle.net/10438/17020.

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O objetivo deste estudo é levantar a influência da criação da Escola de Consta e Gestão do Tribunal de Contas do Estado do Rio de Janeiro na mudança da percepção da imagem da marca coorporativa do Tribunal de Contas do Estado do Rio de Janeiro segundo a percepção dos servidores. O estudo foi feito sob o enfoque da fenomenologia, sendo dado tratamento de categorias filosóficas para a percepção e para a imagem. O conceito de marca foi analisado sob o enfoque do marketing. A pesquisa de campo foi feita por meio de entrevistas semi-estruturadas e desenhos elaborados pelos respondentes. Chegou-se à conclusão que a criação da ECG influenciou a percepção de mudança na imagem do TCE, embora tal influência não tenha sido notada na percepção da missão institucional da organização.
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Costa, Ingrid Biermann de Azevedo. "A GED no TCE-PB: representações sociais de seus usuários." Universidade Federal da Paraí­ba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/5914.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Identify the GED user s social representations in TCE-PB, by tracing the user s profile and reconstructing the deployment process. The approach used was qualitative and quantitative, using the theory of social representations and discourse of the collective subject method. There were used as technical procedures the literature research and fieldwork procedures. Data were collected through the application of mixed questionnaires sent by mail or delivered by hand to the TCE-PB server s that work in the departments of management municipal auditory I and II. This study found that the GED has improved the daily executions tasks and work routines, required less time and effort to fulfill the goals and that users are satisfied with the current conditions. Even brought negative evidences that need to be improved, such as dissatisfaction with the network speed and with the functionality and information foment to SAGRES system, as well as the possibility that current working conditions may affect health.
Apreender as representações sociais dos funcionários do TCE-PB a respeito da GED, traçando-se o perfil dos usuários e reconstruindo-se o processo de implantação. A abordagem utilizada foi qualiquantitativa, com a utilização da teoria das representações sociais e o método do discurso do sujeito coletivo. Utilizaram-se como procedimentos técnicos a pesquisa bibliográfica documental e a pesquisa de campo. Os dados foram coletados através da aplicação de questionários mistos enviados por e-mail ou entregues em mãos aos funcionários do TCE-PB lotados nos Departamentos de Auditoria da Gestão Municipal I e II. O estudo apontou que o GED melhorou as execuções cotidianas das tarefas e rotinas de trabalho, exigiu menos tempo e esforço para o cumprimento das metas e que os usuários encontram-se satisfeitos com as atuais condições de trabalho. Trouxe ainda evidências negativas que precisam ser melhoradas, como insatisfação com a velocidade da rede e com a funcionalidade e fomento de informações do SAGRES, assim como a possibilidade de que as atuais condições de trabalho possam afetar a saúde.
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Plett, James. "Metolachlor and TCE Plume Characteristics in a Dolostone Aquifer Using a Transect." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2966.

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Much is known about natural attenuation of contaminants in granular aquifers because many contaminant plumes in these aquifers have been intensively monitored with detailed sampling along cross sections positioned across the plumes (i. e. transects). However, little is known about natural attenuation of contaminant plumes in fractured rock. In this thesis study, strong natural attenuation of a persistent co-mingled plume of trichloroethylene (TCE) and an herbicide (metolachlor) in a 100 m thick dolostone aquifer used for municipal water supply in Cambridge, Ontario is shown based on detailed delineation of groundwater contaminant concentrations along a single transect located 150 m downgradient from the area where the metolachlor entered the dolostone and 300 m downgradient from the TCE source area. This delineation was accomplished using depth-discrete, multilevel groundwater monitoring systems in five cored holes and detailed analyses of contaminant concentration in rock cores. The maximum metolachlor concentration on the transect is a factor of 20 below the maximum concentration in the metolachlor source area and the maximum TCE concentration on the transect is lower by a factor of 100 from the TCE source area.

Matrix diffusion and strong temporal variability of the groundwater flow system caused by pumping of nearby municipal wells have likely caused strong natural attenuation of metolachlor and TCE and degradation has likely contributed to even stronger TCE attenuation. The transect shows rock core concentrations much higher than the groundwater concentrations in the multilevel systems at the same locations and in the conventional monitoring wells, which indicates that plume persistence is likely maintained by back diffusion from the rock matrix, which has very low hydraulic conductivity but substantial porosity, into the active groundwater flow in the fractures.

Metolachlor has been observed at very low concentrations and has persisted at these concentrations in the nearest municipal pumping well located approximately 780 m downgradient of the transect, however this well shows no detectable TCE. The relatively low concentrations along the transect and the replenishment of the plume by back diffusion suggests that a substantial increase of metolachlor or TCE in the municipal well is unlikely.
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Mattson, Kelli M. "Investigating the Biostimulating Effects of ESO Addition to a TCE Contaminated Site." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/40871.

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Remediation of chlorinated ethene contaminated sites presents a problem for the environmental industry. Many innovative technologies exist to remove these chemicals from the subsurface; however, most of these technologies require extensive time and incur significant cost. A technology called bioremediation utilizes microorganisms to break down contaminants such as perchloroethene (PCE), trichloroethene (TCE), dichloroethene (DCE), and vinyl chloride (VC) to non-toxic compounds in a process called reductive dechlorination. Microorganisms that are capable of dechlorination usually require reducing conditions as well as bioavailable hydrogen and carbon sources. Emulsified vegetable oil has emerged as a cost-effective source of degradable organic matter to facilitate reductive dechlorination in the subsurface. Through Æ Ã -oxidation, microorganisms can break down the long chain fatty acids in vegetable oil into smaller fatty acids such as acetate, propionate, and butyrate. The fermentation of the oil provides reduced conditions as well as a slow release of hydrogen and carbon into the subsurface. This study consisted of an evaluation the effectiveness of emulsified vegetable oil in stimulating reductive dechlorination using sixteen laboratory microcosms constructed from soil and groundwater from an aquifer contaminated with TCE located at the Naval Weapons Station in Charleston, South Carolina. Each microcosm was monitored for chloroethenes, volatile fatty acids, long chain fatty acids, and total carbon on a weekly basis. Results show successful fermentation of fatty acids and reduced conditions favorable for dechlorination.
Master of Science
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Braga, Bernardo Drummond. "Devemos monitorar a pressão intracraniana de pacientes com TCE grave marshall II?" Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/BUBD-9GHHJA.

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Introduction: Intracranial pressure (ICP) monitoring is considered the standard of care for severe traumatic brain injury (TBI). A recent clinical trial concluded that care focused on maintaining monitored intracranial pressure at 20 mm Hg or less was not shown to be superior to care based on imaging and clinical examination. Purpose: Evaluate the relationship of intracranial hypertension with an increase of brain lesions, mortality and morbidity in patients with severe TBI Marshall II. Determine whether these patients need to have ICP monitored. Methods: Prospective observational cohort study on severe TBI patients (GCS8), Marshall CT classification II. Results: Seventy patients were divided into 2 groups based on ICP in the first 48h; G1: ICP 20mmHg (49 patients) and G2 ICP > 20mmHg (21 patients), 90% male, mean age 30.8 years, 78,5% sustained motor vehicle crash or pedestrian injuries, mean GCS 6. The most common CT findings were: subarachnoid hemorrhages and contusions (22 and 18 respectively). Seven patients died in G2 (33%) compared to 2 deaths in G1 (4%) (p<0.05). The OR of death was 11,7 times greater in G2 (95%CI: 2.2- 63,1). The median Glasgow outcome scale (GOS) score at 90 days was 2 in G2 and 5 in G1. New CT findings or progression were detected in 15 (71%) of G2 patients and in 5 (10%) G1 patients (p<0.05). The OR of new CT finding or progression was 22 times greater in G2 than G1 (95%CI: 5,02- 106,9). Two patients in G2 required surgery, none in G1. Conclusions: Severe TBI patients with Marshall score II and intracranial hypertension, are at greater risk for new CT abnormalities, worse prognosis, and higher mortality than those with no hypertension. ICP monitoring was crucial to define prognosis. Severe TBI Marshall II patients should be monitored.
Introdução: A monitoração da pressão intracraniana (PIC) é considerada o tratamento padrão para pacientes com traumatismo cranioencefálico grave (TCE). Um ensaio clinico recente demonstrou que pacientes tratados conforme protocolos em que o foco é manter a PIC menor que 20mmhg, não foi superior a protocolos de tratamento baseado em imagens e exame físico. Objetivos: Avaliar a relação da hipertensão intracraniana com crescimento de lesões, mortalidade e morbidade em pacientes com TCE grave Marshall II. Determinar se esses pacientes precisam monitorar a PIC. Método: Estudo de coorte observacional prospectivo em pacientes com TCE grave classificados como Marshall II. Resultados: setenta pacientes foram divididos em dois grupos baseado na PIC: G1- PIC 20mmHg (49 pacientes) e G2- PIC > 20mmHg (21 pacientes). Sendo: 90% masculino, idade média de 30.8 anos, 78,5% tendo como mecanismo de trauma o acidente automobilistico ou atropelamento. A escala de coma de glasgow (ECG) média foi igual a 6. Os achados mais comuns na tomografia foram hemorragias subaracnóideas e as contusões (22 e 18 respectivamente). Sete pacientes morreram no G2 (33%) comparado a duas mortes no G1 (4%) (p<0,05). O OR de mortalidade foi 11,7 vezes maior no G2 (IC 95%: 2,2 a 63,1). A mediana da Escala de Desfecho de Glasgow após 90 dias foi de 2 para o G2 e de 5 para o G1. Novos achados ou progressões de lesões ocorreram em 15 (71%) dos pacientes do G2 e em 5 (10%) dos pacientes do G1 (p<0,05). O OR de um novo achado na TC foi vinte e duas vezes maior no G2 em comparação ao G1 (IC 95%: 5,02 a 106,9). Dois pacientes do G2 precisaram de cirurgia e nenhum do G1. Conclusões: Pacientes com TCE grave Marshall II, com hipertensão intracraniana, tem maior risco para crescimento de lesões na TC de controle, pior prognóstico e maior mortalidade que aqueles sem hipertensão. A monitoração destes pacientes foi definitiva para determinar o prognóstico. Pacientes com TCE grave Marshall II deverão ser monitorados.
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Oliveira, Priscila Pinto de. "A influência da imprensa no processo de ampliação da transparência no TCE-RS." Pontifícia Universidade Católica do Rio Grande do Sul, 2012. http://hdl.handle.net/10923/1956.

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This dissertation analyses the media influence on introduction of transparency processes at Tribunal de Contas do Estado do Rio Grande do Sul (TCE-RS) between 2008 and 2011. In order to achieve this purpose, first we present the concepts of public transparency and accountability according the literature. The focus is to show how the media acts as an agent of social responsiveness. After, we expose the political context and the institutional changes that occurred at TCE-RS during the period in analyses. The media view of this time is also focused. The objective is to show the context of the decision making moments regarding transparency. Then, we analyses four interviews made with the men who were president of TCE-RS during the period in focus. The interview intent is to reveal factors that influenced the introduction of transparency processes at TCE-RS. Our findings indicate that media played a key role at these institutional changes.
Esta dissertação analisa a influência da imprensa na adoção de mecanismos de transparência pelo Tribunal de Contas do Estado do Rio Grande do Sul (TCE-RS) entre 2008 e 2011. Para contextualizar o tema, são apresentados os conceitos de transparência pública e accountability, além de suas dimensões e vertentes. O objetivo é jogar luz sobre a atuação da mídia como agente de responsabilização social. Em um segundo momento, é realizado um apanhado histórico do surgimento e da consolidação dos tribunais de contas do país, especialmente no Rio Grande do Sul. Em seguida, são expostas a conjuntura política e as mudanças institucionais sofridas pelo TCE-RS no período estudado e a visão da imprensa sobre a instituição à época. A intenção é reconstituir o cenário existente nos momentos de tomada de decisão em relação à transparência. Por último, a partir de entrevistas com os presidentes que estiveram à frente da instituição no período enfocado, busca-se demonstrar os fatores que influenciaram a Corte no sentido de ampliar a transparência das suas ações e de instituir canais de comunicação com a sociedade. A pesquisa indica que a imprensa foi um dos fatores fundamentais nessa mudança institucional.
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Sehnem, Clarissa Garcia Corrêa. "Cooperação interorganizacional no setor público : o arranjo entre a EG/FDRH e a ESGC/TCE-RS." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/165639.

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Esta dissertação buscou analisar um arranjo de cooperação interorganizacional no setor público direcionado para a qualificação dos servidores públicos no que tange à gestão e fiscalização de contratos. O objetivo principal foi compreender como se formou o arranjo de cooperação entre a Escola de Governo (EG)/FDRH e a Escola de Gestão e Controle Francisco Juruena/TCE-RS, assim como sua atuação na legitimação de práticas padronizadas relacionadas à gestão e fiscalização de contratos públicos no âmbito do Rio Grande do Sul através da operacionalização de um curso na modalidade EAD. Trata-se de um estudo de caso predominantemente qualitativo com base em: 1) pesquisa documental para compreensão dos fatores históricos e características das duas organizações que realizaram a cooperação; 2) entrevistas semiestruturadas com os principais atores que participaram do processo decisório em relação à formação, operacionalização e avaliação dos principais resultados do arranjo de cooperação; e 3) questionários enviados aos alunos aprovados na primeira edição do curso para identificar sua percepção sobre a relevância do Curso de Gestão e Fiscalização de Contratos EAD. Como principais resultados desta pesquisa, percebe-se que o curso vem atingindo seus objetivos ao padronizar a atividade dos fiscais e gestores de contratos públicos, assim como as edições EAD suportadas pelo arranjo de cooperação interorganizacional atingiram um número maior de alunos/servidores, com menor custo e com abrangência de servidores de um maior número de municípios.
This dissertation had the intent to analyze an interorganizational arrangement within the public sector related to the qualification of the public sector employees regarding inspections and Management of Contracts. The main objective was to understand how the cooperation arrangement between the Government School/ FDRH and the Management and Control School Francisco Juruena/TCE-RS was established, as well as its performance in the legitimation of isomorphic practices related to the management and inspection of public contracts within Rio Grande do Sul’s scope, via the operationalization of an EAD course. This is a predominantly qualitative study based on: 1) documented research to understand the historical factors and characteristics of the two organizations that practiced the cooperation; 2) semi-structured interviews with the main players who participated in the decision-making process regarding the establishment, operationalization and evaluation of the main results of the cooperation arrangement; and 3) questionnaires sent to the course’s first edition approved students in order to capture their perception about the relevance of the EAD Contracts Management and Inspection course. It was perceived, via the main results of this research, that the course reached its objectives as part of an institutionalization process that seeks to standardize the activity of inspection and public contract managers; As well as the EAD editions supported by the interorganizational cooperation arrangement reached a greater number of students /employees, with lower cost and with the inclusion of public employees from a greater number of municipalities;
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Secrist, Philip Moyer III. "A Numerical Model (SEAM3D) to Assess the Biotransformation of Chlorinated Ethenes at a TCE/BTEX Contaminated Site." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/42433.

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Numerical models (GMS MODFLOW, SEAM3D, and SEAM3D Interface) were applied to simulate groundwater flow, petroleum hydrocarbon compound (PHC) transport and biodegradation, and the transport and biotransformation of chlorinated ethenes at Site FT-002 Plattsburgh Air Force Base (PAFB), NY. Site FT-002 was contaminated with waste jet fuel and chlorinated ethenes used as a fire source during fire fighting training. The results of groundwater analysis indicated that the aquifer exhibited aerobic, nitrate reducing, ferrogenic, sulfate reducing and methanogenic conditions due to the biodegradation of the PHCs. Additional groundwater analysis showed the biotransformation of TCE to DCE, VC, and ethene. A numerical model was developed to simulate and assess the extent to which reductive dechlorination and direct anaerobic oxidation were responsible for the biotransformation of the chlorinated ethenes. Reductive dechlorination accounted for the 100%, 98.3%, and 97.5% of the biotransformation of TCE, DCE, and VC respectively. Direct anaerobic oxidation accounted for 1.7% and 2.5% of the biotransformation of DCE and VC respectively. Though direct anaerobic oxidation only accounted for a small percentage of total biotransformation it was necessary to fully develop the biotransformation of the DCE and VC in the ferrogenic zone. This study focused on the mechanisms responsible for the biotransformation of chlorinated ethenes, specifically reductive dechlorination and direct anaerobic oxidation. By further defining the NAPL source and initial conditions it could be used as a tool to accurately predict the monitored natural attenuation (MNA) of the FT-002 contaminant plume.
Master of Science
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Ogundare, Ojo Oluwaseun. "Optimization and Analysis of a Slow-Release Permanganate Gel for TCE Plume Treatment in Groundwater." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou161797021188483.

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Books on the topic "TCE-a"

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V, Rood Robert, Atkinson Roger, and California. Air Resources Board. Stationary Source Division., eds. Proposed identification of trichloroethylene as a toxic air contaminant: Technical support document : report to the Air Resources Board on trichloroethylene (TCE). [Sacramento, CA]: State of California, Air Resources Board, Stationary Source Division, 1990.

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Derfler, Frank J. TCP/IP: A survival guide. New York: MIS:Press, 1998.

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Tcl/Tk: A developer's guide. 3rd ed. Boston, MA: Morgan Kaufmann, 2012.

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Walking TCU: A historic perspective. Fort Worth: Texas Christian University Press, 1992.

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Evans, J. T. (Jim T.), ed. TCP/IP: Running a successful network. 2nd ed. Harlow, England: Addison Wesley Longman, 1996.

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Ain't that bout' a b*tch. United States]: Xlibris, 2014.

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Flaws, Bob. A compendium of TCM patterns & treatments. Boulder, CO: Blue Poppy Press, 2000.

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Joanna, Kulik, and NASA Glenn Research Center, eds. A simulation study of paced TCP. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2000.

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Flaws, Bob. A compendium of TCM patterns & treatments. Boulder, CO: Blue Poppy Press, 1996.

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Flaws, Bob. A compendium of TCM patterns & treatments. Boulder, CO: Blue Poppy Press, 1996.

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Book chapters on the topic "TCE-a"

1

Walsh, Matthew, John Liskowitz, Thomas Boland, Mary DeFlaun, and Robert Steffan. "Remediation of a Low Permeability TCE Contaminated Bedrock, Part 2. Pneumatic Injection of Constitutive TCE Degrading Organisms." In Remediation in Rock Masses, 152–68. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/9780784400159.ch12.

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Gillespie, M. T., and J. M. Strong-gunderson. "Effects of a Nutrient-Surfactant Compound on Solubilization Rates of TCE." In Biotechnology for Fuels and Chemicals, 835–43. Totowa, NJ: Humana Press, 1997. http://dx.doi.org/10.1007/978-1-4612-2312-2_73.

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Barnthouse, L. W., A. V. Palumbo, V. S. Tripath, and C. D. Little. "Modeling the Growth Kinetics and Substrate Utilization of a TCE-Degrading Microorganism." In Environmental Biotechnology, 443–44. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4899-0824-7_34.

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Keffer, Edward B., John Schuring, and Stewart Abrams. "Remediation of a Low Permeability TCE Contaminated Bedrock, Part 1. Pneumatic Fracturing Technology for Permeability Enhancement." In Remediation in Rock Masses, 137–51. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/9780784400159.ch11.

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Phenrat, Tanapon, Daniel Schoenfelder, Mark Losi, June Yi, Steven A. Peck, and Gregory V. Lowry. "Treatability Study for a TCE Contaminated Area using Nanoscale- and Microscale-Zerovalent Iron Particles: Reactivity and Reactive Life Time." In ACS Symposium Series, 183–202. Washington DC: American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1027.ch010.

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Aulenta, F., A. Di Fazio, M. Leccese, M. Majone, M. Petrangeli Papini, S. Rossetti, N. Stracqualursi, V. Tandoi, and P. Viotti. "Assessing the potential for natural or enhanced in-situ bioremediation at a TCE-contaminated site by coupling process analysis and modeling." In Reactive Transport in Soil and Groundwater, 265–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-26746-8_19.

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Nagamalai, Dhinaharan, Beatrice Cynthia Dhinakaran, Byoung-Sun Choi, and Jae-Kwang Lee. "V-TCP: A Novel TCP Enhancement Technique." In Networking - ICN 2005, 125–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/978-3-540-31957-3_16.

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De Vendictis, Andrea, and Andrea Baiocchi. "Modeling a Mixed TCP Vegas and TCP Reno Scenario." In NETWORKING 2002: Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communications, 612–23. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/3-540-47906-6_49.

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Barik, Runa, and Dinil Mon Divakaran. "TCP Initial Window: A Study." In Wired/Wireless Internet Communication, 290–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30630-3_25.

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Mellia, Marco, Michela Meo, and Claudio Casetti. "TCP Smart Framing: A Segmentation Algorithm to Improve TCP Performance." In Quality of Service in Multiservice IP Networks, 276–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-36480-3_20.

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Conference papers on the topic "TCE-a"

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de Medeiros Tavares, Maristela, Sergio Paulo de Abreu Martins Teixeira, and Alexandre Kehrig Veronese Aguiar. "A PRÁTICA DO PROCESSO ADMINISTRATIVO NO TCE-RJ." In Seminário de Pesquisa: A organização profissional dos operadores do Direito. ,: Even3, 2023. http://dx.doi.org/10.29327/operadoresdodireito.486965.

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Burge, Scott R. "Automated Analysis of Trichloroethene and Chloroform." In ASME 2003 9th International Conference on Radioactive Waste Management and Environmental Remediation. ASMEDC, 2003. http://dx.doi.org/10.1115/icem2003-4648.

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Chloroform and trichloroethene (TCE) are two organic contaminants commonly encountered in ground water. TCE, formerly a common cleaning solvent, is usually associated with contaminated aquifers. Chloroform is usually associated with the chlorination of municipal water. The remediation level for TCE in aquifers is typically 5 ppb, therefore, the analytical method employed for monitoring these analytes must be capable of detecting and quantifying the analytes in the low ppb concentration range. The most common analytical methodology for the determination of TCE or chloroform in water is a purge and trap technique for sample introduction into a gas chromatographic system equipped with electroconductivity or mass spectroscopy detector. The instrumentation has a method limit of detection (LOD) of less than 0.5 ppb for TCE and chloroform, however, the expense, size and complexity of the gas chromatographic techniques limit its use outside the laboratory environment. An alternative to the gas chromatographic method for the analysis of select volatile chlorinated compounds in the low concentration range is an analytical instrument based on a halocarbon-specific optrode. The principle of detection is a quantitative, irreversible chemical reaction (modified Fujiwara reaction) that forms visible light-absorbing products. The operational basis of the optrode is the measure of the time history of the development of the colored (red) product formed by the reaction of the target analytes. The optrode has the selectivity and sensitivity for monitoring TCE and chloroform at the low ppb concentration range in the presence of other volatile chlorinated contaminants. The low-power requirements and simplicity of design make it a good choice for remote operations. This paper presents the analytical results (January 2002, to December 2002) of a panel-mounted instrument used to monitor the influent and effluent water of a TCE treatment facility located in Scottsdale, Arizona, and the analytical results of a well-mounted instrument used to monitor ground water (May 2002, to August 2002) at Edwards Air Force Base, California.
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Mao, Xiaomin, and Haizhu Hu. "Modelling Bio-Enhanced TCE DNAPL Elimination in a Soil Column." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5516966.

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Karthikeyan, P., K. V. Uma, and S. Pudumalar. "Effectiveness of Mobile Learning at TCE, India: A Learner Perspective." In 2015 IEEE Seventh International Conference on Technology for Education (T4E). IEEE, 2015. http://dx.doi.org/10.1109/t4e.2015.8.

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Zhang, Shenwei, Jason Yan, Shahani Kariyawasam, Terry Huang, and Mohammad Al-Amin. "Plausible Profile (Psqr) Corrosion Assessment Model: Refinement, Validation and Operationalization." In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9448.

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Abstract This paper presents the refinement, validation, and operationalization of Plausible Profiles (Psqr) corrosion assessment model that TC Energy (TCE) published in IPC 2018. Metal-loss corrosion continues to be a major integrity threat to oil and gas pipelines. Inline inspection (ILI) based corrosion management, where ILI measured anomalies are assessed and mitigated, has proven to be the best way to manage corrosion. The assessment model used to estimate the burst pressure of pipelines has the most significant impact on integrity decisions. These decisions include (1) which anomalies to excavate based on In-line inspection (ILI); (2) pressure reduction (i.e. derate) required to maintain safety until repairs are completed, and (3) repair decisions during the excavation. Consequently, TCE focused on improving the shape factor of the Modified B31G effective area technique and published an overview of the improvement in IPC 2018 paper titled “A More Accurate and Precise Method for Large Metal Loss Corrosion Assessment”. From 2018 TCE refined the model using further testing, validation, internal review, and external review. In 2019, the model was reviewed by eight industry experts through Pipeline Research Council International (PRCI) project “EC-2-9 Peer Review of the Plausible Profile (Psqr) Corrosion Assessment Model”. The project outcome recommended Psqr as an improved corrosion assessment model. The comments and recommendations provided by the reviewers will be reported in IPC 2020 in a companion paper. Validation results show the Psqr model is safe, and more accurate and precise than RSTRENG. The resulting magnitude of reduction in unnecessary activities depends on the corrosion morphology.
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Gheorghiu, Victor. "Enhancement Potential of the Thermal Conversion Efficiency of Ice Cycles by Using of a Real Atkinson Cycle Implementation and (Very) High Pressure Turbo Charging." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24031.

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Most recent implementations of the Atkinson cycle are not optimal from the point of view of Thermal Conversion Efficiency (TCE). For example, Toyota has put in its Prius II a gasoline engine which should achieve high efficiency by using a modified Atkinson cycle based on variable intake valve timing management. Firstly, this implementation of the Atkinson cycle is not the optimal solution because some of the air is first sucked from the intake manifold into the cylinder and subsequently returned back there. As a consequence, the oscillating air stream considerably reduces the thermal conversion efficiency of this cycle. Secondly, this implementation of the Atkinson cycle reaches only low levels of Indicated Mean Pressure (IMEP) and, thirdly, it is not suitable for part load Engine Operating Points (EOP) because of the lower TCE. For these reasons, this implementation of the Atkinson cycle is suitable only for hybrid vehicles, where the engine — because it is not directly linked mechanically to the wheels — works only in its best EOP. In this paper the losses in TCE of Internal Combustion Engine (ICE), especially for the Atkinson cycles, are analyzed in detail and a proposal is made for their reduction for aspirated and especially for high pressure supercharged engines.
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Schaffner, Jr., I. Richard, Eric C. Lindhult, Steven R. Lamb, and Kent C. Armstrong. "Destruction of DNAPL through a Green Technology—TCE Source Area Bioremediation." In World Environmental and Water Resources Congress 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41173(414)416.

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Xu, Xusong, and Pin Wang. "A Study on Risk Measurements Exceeding VaR: TCE, CVaR and ES." In 2007 3rd International Conference on Wireless Communications, Networking, and Mobile Computing - WiCOM '07. IEEE, 2007. http://dx.doi.org/10.1109/wicom.2007.998.

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Pranto Filho, Frederico N., Renan Oliveira, Lindemberg Silva Pereira, and Joir Ramalho. "A iniciativa da construção do Plano de Dados Abertos do Tribunal de Contas do Rio Grande do Norte através de parceria acadêmica com a Universidade Federal do Rio Grande do Norte." In VI Workshop de Transparência em Sistemas. Sociedade Brasileira de Computação - SBC, 2018. http://dx.doi.org/10.5753/wtrans.2018.3096.

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Embora haja várias vantagens e motivações para a abertura dos dados pelos órgãos da administração pública, há também algumas dificuldades e barreiras a serem superadas para a efetivação de uma política de Dados Abertos Governamentais (DAG). Estudos investigam as principais motivações dos desenvolvedores e fornecedores em trabalhar com DAG, bem como procuram identificar as dificuldades enfrentada por eles. O objetivo geral deste trabalho compreende relatar a estratégia adotada nos estágios preliminares da implantação do Plano de Dados Abertos (PDA) do Tribunal de Contas do Rio Grande do Norte (TCE/RN). A construção do PDA buscou seguir como metodologia de trabalho as diretivas definidas no ProceDA (Processo para Dados Abertos). Além disso, vamos discutir e compartilhar os ganhos obtidos a partir de uma parceria entre o TCE/RN e a Universidade Federal do Rio Grande do Norte (UFRN).
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Agostinho, Matheus Cavalcanti, and George Valença. "Como definir um laboratorio de inovação em governo? Um estudo de caso de uma iniciativa na área de controle externo." In Simpósio Brasileiro de Sistemas Colaborativos. Sociedade Brasileira de Computação, 2022. http://dx.doi.org/10.5753/sbsc.2022.19478.

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Na última década, os laboratórios de inovação têm se tornado cada vez mais frequentes e importantes para alavancar a inovação em todas as esferas e áreas de atuação do setor público brasileiro. No entanto, os relatos sobre o processo de desenvolvimento desses laboratórios ainda são escassos e superficiais. Neste artigo, apresentamos um estudo de caso descritivo do Prisma Lab, laboratório de inovação do Tribunal de Contas do Estado de Pernambuco (TCE-PE). Através de uma cooperação técnica com a academia, o TCE-PE pôde estruturar a o seu laboratório, que adota um modelo de inovação aberta para enfrentar os variados desafios da instituição, ampliar os seus resultados e legitimar sua relevância para a sociedade.
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Reports on the topic "TCE-a"

1

Clausen, Jay, D. Moore, K. Miller, and L. Haines-Ecklund. VI preferential pathways of a large government building. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43260.

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Trichloroethylene (TCE) releases from leaks and spills next to a large government building occurred over several decades with the most recent event occurring 20 years ago. In response to a perceived conventional vapor intrusion (VI) issue a sub-slab depressurization system (SSDS) was installed 6 years ago. The SSDS is operating within design limits and has achieved building TCE vapor concentration reductions. However, subsequent periodic TCE vapor spikes based on daily HAPSITE™ measurements indicate additional source(s). Two rounds of smoke tests conducted in 2017 and 2018 involved introduction of smoke into a sanitary sewer and storm drain manholes located on effluent lines coming from the building until smoke was observed exiting system vents on the roof. Smoke testing revealed many leaks in both the storm sewer and sanitary sewer systems within the building. Sleuthing of the VI source term using a portable HAPSITE™ indicate elevated vapor TCE levels correspond with observed smoke emanation from utility lines. Sleuthing activities also found building roof materials explain some of the elevated TCE levels on the 2nd floor. Installation of an external blower in the roof truss space has greatly reduced TCE levels. Preferential VI pathways and unexpected source terms may be overlooked mechanisms as compared to conventional VI.
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Clausen, Jay, D. Moore, L. Cain, and K. Malinowski. VI preferential pathways : rule or exception. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41305.

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Trichloroethylene (TCE) releases from leaks and spills next to a large government building occurred over several decades with the most recent event occurring 20 years ago. In response to a perceived conventional vapor intrusion (VI) issue a sub-slab depressurization system (SSDS) was installed 6 years ago. The SSDS is operating within design limits and has achieved building TCE vapor concentration reductions. However, subsequent periodic TCE vapor spikes based on daily HAPSITE™ measurements indicate additional source(s). Two rounds of smoke tests conducted in 2017 and 2018 involved introduction of smoke into a sanitary sewer and storm drain manholes located on effluent lines coming from the building until smoke was observed exiting system vents on the roof. Smoke testing revealed many leaks in both the storm sewer and sanitary sewer systems within the building. Sleuthing of the VI source term using a portable HAPSITE™ indicate elevated vapor TCE levels correspond with observed smoke emanation from utility lines. In some instances, smoke odors were perceived but no leak or suspect pipe was identified suggesting the odor originates from an unidentified pipe located behind or enclosed in a wall. Sleuthing activities also found building roof materials explain some of the elevated TCE levels on the 2nd floor. A relationship was found between TCE concentrations in the roof truss area, plenum space above 2nd floor offices, and breathing zone of 2nd floor offices. Installation of an external blower in the roof truss space has greatly reduced TCE levels in the plenum and office spaces. Preferential VI pathways and unexpected source terms may be overlooked mechanisms as compared to conventional VI.
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3

Harvey, Gregory. In Situ Remediation of a TCE-Contaminated Aquifer Using a Short Rotation Woody Crop Groundwater Treatment System. Fort Belvoir, VA: Defense Technical Information Center, May 2006. http://dx.doi.org/10.21236/ada607334.

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4

Zawislanski, P. T., C. M. Oldenburg, C. A. Doughty, and B. M. Freifeld. Application of the vadose zone monitoring system at a TCE-contaminated site: Field data and modeling summary. Office of Scientific and Technical Information (OSTI), September 1999. http://dx.doi.org/10.2172/764351.

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Martino, L. E., T. L. Patton, and J. J. Quinn. A conservative evaluation of the transport of TCE from the confined aquifer beneath J-Field, Aberdeen Proving Ground, Maryland, to a hypothetical receptor. Office of Scientific and Technical Information (OSTI), January 1999. http://dx.doi.org/10.2172/12037.

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Pelletier, G., K. Sandlund, and M. West. RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP). RFC Editor, July 2007. http://dx.doi.org/10.17487/rfc4996.

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Pelletier, G., K. Sandlund, and M. West. RObust Header Compression (ROHC): A Profile for TCP/IP (ROHC-TCP). RFC Editor, January 2013. http://dx.doi.org/10.17487/rfc6846.

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8

Dunigan, TH. A TCP-Over-UDP Test Harness. Office of Scientific and Technical Information (OSTI), October 2002. http://dx.doi.org/10.2172/885561.

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Kessler, G., and S. Shepard. A Primer On Internet and TCP/IP Tools. RFC Editor, December 1994. http://dx.doi.org/10.17487/rfc1739.

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Touch, J. A TCP Authentication Option Extension for NAT Traversal. RFC Editor, July 2013. http://dx.doi.org/10.17487/rfc6978.

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