Academic literature on the topic 'CHLS'
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Journal articles on the topic "CHLS"
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Kong, Bo, Bing He, Huan Yu, and Yu Liu. "An Integrated Field and Hyperspectral Remote Sensing Method for the Estimation of Pigments Content of Stipa Purpurea in Shenzha, Tibet." Mathematical Problems in Engineering 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/4787054.
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Stipa purpurea is the representative type of alpine grassland in Tibet and the surviving and development material for herdsmen. This paper takes Shenzha County as the research area. Based on the analysis of typical hyperspectral variables sensitive to chlorophyll content of Stipa purpurea, 10 spectral variables with significant correlation with chlorophyll were extracted. The estimation model of chlorophyll was established. The photosynthetic pigment contents in the Shenzha area were calculated by using HJ-1A remote sensing images. The results show that (1) there are significant correlations between chlorophyll content and spectral variables; in particular, the coefficient of Chlb in Stipa purpurea with RVI is the largest (0.728); (2) 10 variables are correlated with chlorophyll, and the order of correlation is Chlb > Chla > Chls; (3) for the estimation of Chla, the EVI is the best variable. RVI, NDVI, and VI2 are suitable for Chlb; RVI and NDVI are also suitable for the estimation of Chls; (4) the mean estimated content of Chla in Stipa bungeana is about 4.88 times that of Chlb, while Cars is slightly more than Chlb; (5) the distribution of Chla is opposite to Chlb and Chls content in water area.
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Lin, C., S. C. Popescu, S. C. Huang, Y. C. Chen, P. T. Chang, and H. L. Wen. "A novel reflectance-based model for evaluating chlorophyll concentration of fresh and water-stressed leaves." Biogeosciences Discussions 10, no. 11 (2013): 17893–937. http://dx.doi.org/10.5194/bgd-10-17893-2013.
Full textAbstract:
Abstract. Water deficit can cause chlorophyll degradation which decreases foliar chlorophyll concentration (Chls). Few studies investigated the effectiveness of spectral indices under water stress conditions. Chlorophyll meters have been extensively used for a wide variety of leaf chlorophyll and nitrogen estimations. Since a chlorophyll meter works based on the sensing of leaves absorptance and transmittance, the reading of chlorophyll concentration will be affected by changes in transmittance as if there is a water deficit in leaves. The overall objective of this paper was to develop a novel and reliable reflectance-based model for estimating Chls of fresh and water stressed leaves using the reflectance at the absorption bands of chlorophyll a and b and the red edge spectrum. Three independent experiments were designed to collect data from three leaf sample sets for the construction and validation of Chls estimation models. First, a reflectance experiment was conducted to collect foliar Chls and reflectance of leaves with varying water stress using the ASD FieldSpec spectroradiometer. Second, a chlorophyll meter (SPAD-502) experiment was carried out to collect foliar Chls and meter reading. These two datasets were separately used for developing reflectance-based or absorptance-based Chls estimation models using linear and nonlinear regression analysis. Suitable models were suggested mainly based on the coefficient of determination (R2). Finally, an experiment was conducted to collect the third dataset for the validation of Chls models using the root mean squared error (RMSE) and the mean absolute error (MAE). In all of the experiments, the observations (real values) of the foliar Chls were extracted from acetone solution and determined by using a Hitachi U-2000 spectrophotometer. The spectral indices in the form of reflectance ratio/difference/slope derived from the chlb absorption bands (ρ645 and ρ455) provided Chls estimates with RMSE around 0.40–0.55 mg g–1 for both fresh and water-stressed samples. We improved Chls prediction accuracy by incorporating the reflectance at red edge position (ρREP) in regression models. An effective chlorophyll indicator with the form of (ρ645–ρ455) / ρREP proved to be the most accurate and stable predictor for foliar Chls concentration. This model was derived with an R2 of 0.90 (P < 0.01) from the training samples and evaluated with RMSE 0.35 and 0.38 mg g–1 for the validation samples of fresh and water stressed leaves, respectively. The average prediction error was within 14% of the mean absolute error.
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JENSEN, Poul E., James D. REID, and C. Neil HUNTER. "Modification of cysteine residues in the ChlI and ChlH subunits of magnesium chelatase results in enzyme inactivation." Biochemical Journal 352, no. 2 (2000): 435–41. http://dx.doi.org/10.1042/bj3520435.
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The enzyme magnesium protoporphyrin chelatase catalyses the insertion of magnesium into protoporphyrin, the first committed step in chlorophyll biosynthesis. Magnesium chelatase from the cyanobacterium Synechocystis PCC6803 has been reconstituted in a highly active state as a result of purifying the constituent proteins from strains of Escherichia coli that overproduce the ChlH, ChlI and ChlD subunits. These individual subunits were analysed for their sensitivity to N-ethylmaleimide (NEM), in order to assess the roles that cysteine residues play in the partial reactions that comprise the catalytic cycle of Mg2+ chelatase, such as the ATPase activity of ChlI, and the formation of ChlI–ChlD–MgATP and ChlH–protoporphyrin complexes. It was shown that NEM binds to ChlI and inhibits the ATPase activity of this subunit, and that prior incubation with MgATP affords protection against inhibition. Quantitative analysis of the effects of NEM binding on ChlI-catalysed ATPase activity showed that three out of four thiols per ChlI molecule are available to react with NEM, but only one cysteine residue per ChlI subunit is essential for ATPase activity. In contrast, the cysteines in ChlD are not essential for Mg2+ chelatase activity, and the formation of the ChlI–ChlD–ATP complex can proceed with NEM-treated ChlI. Neither the ATPase activity of ChlI nor NEM-modifiable cysteines are therefore required to form the ChlI–ChlD–MgATP complex. However, this complex cannot catalyse magnesium chelation in the presence of the ChlH subunit, protoporphyrin and Mg2+ ions. The simplest explanation for this is that in an intact Mg2+ chelatase complex the ATPase activity of ChlI drives the chelation process. NEM binds to ChlH and inhibits the chelation reaction, and this effect can be partially alleviated by pre-incubating ChlH with magnesium and ATP. We conclude that cysteine residues play an important role in the chelation reaction, in respect of the ChlI–MgATP association, ATP hydrolysis and in the interaction of ChlH with MgATP and protoporphyrin IX.
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JENSEN, Poul E., Lucien C. D. GIBSON, and C. Neil HUNTER. "Determinants of catalytic activity with the use of purified I, D and H subunits of the magnesium protoporphyrin IX chelatase from Synechocystis PCC68031." Biochemical Journal 334, no. 2 (1998): 335–44. http://dx.doi.org/10.1042/bj3340335.
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The I, D and H subunits (ChlI, ChlD and ChlH respectively) of the magnesium protoporphyrin IX chelatase from Synechocystis have been purified to homogeneity as a result of the overexpression of the encoding genes in Escherichia coli and the production of large quantities of histidine-tagged proteins. These subunits have been used in an initial investigation of the biochemical and kinetic properties of the enzyme. The availability of pure ChlI, ChlD and ChlH has allowed us to estimate the relative concentrations of the three protein components required for optimal activity, and to investigate the dependence of chelatase activity on the concentrations of MgCl2, ATP and protoporphyrin IX. It was found that, whereas ChlD and ChlH are likely to be monomeric, ChlI can aggregate in an ATP-dependent manner, changing from a dimeric to an octameric structure. Subunit titration assays suggest an optimal ratio of ChlI, ChlD and ChlH of 2:1:4 respectively. However, the dependence of chelatase activity on increasing concentrations of ChlI and ChlH with respect to ChlD suggests that these two subunits, at least in vitro, behave as substrates in their interaction with ChlD. Mg chelation could not be detected unless the Mg2+ concentration exceeded the ATP concentration, suggesting at least two requirements for Mg2+, one as a component of MgATP2-, the other as the chelated metal. The steady-state kinetic parameters were determined from continuous assays; the Km values for protoporphyrin, MgCl2 and ATP were 1.25 µM, 4.9 mM and 0.49 mM respectively. The rate dependence of Mg2+ was clearly sigmoidal with a Hill coefficient of 3, suggesting positive co-operativity. Initiating the reaction by the addition of one of the substrates in these continuous assays resulted in a significant lag period of at least 10 min before the linear production of Mg protoporphyrin. This lag was significantly decreased by preincubating ChlI and ChlD with ATP and MgCl2, and by mixing it with ChlH that had been preincubated with protoporphyrin IX, ATP and MgCl2. This suggests not only a close MgATP2--dependent interaction between ChlI and ChlD but also an interaction between ChlH and the protoporphyrin substrate that also is stimulated by ATP and MgCl2.
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Farmer, David A., Amanda A. Brindley, Andrew Hitchcock, et al. "The ChlD subunit links the motor and porphyrin binding subunits of magnesium chelatase." Biochemical Journal 476, no. 13 (2019): 1875–87. http://dx.doi.org/10.1042/bcj20190095.
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Abstract Magnesium chelatase initiates chlorophyll biosynthesis, catalysing the MgATP2−-dependent insertion of a Mg2+ ion into protoporphyrin IX. The catalytic core of this large enzyme complex consists of three subunits: Bch/ChlI, Bch/ChlD and Bch/ChlH (in bacteriochlorophyll and chlorophyll producing species, respectively). The D and I subunits are members of the AAA+ (ATPases associated with various cellular activities) superfamily of enzymes, and they form a complex that binds to H, the site of metal ion insertion. In order to investigate the physical coupling between ChlID and ChlH in vivo and in vitro, ChlD was FLAG-tagged in the cyanobacterium Synechocystis sp. PCC 6803 and co-immunoprecipitation experiments showed interactions with both ChlI and ChlH. Co-production of recombinant ChlD and ChlH in Escherichia coli yielded a ChlDH complex. Quantitative analysis using microscale thermophoresis showed magnesium-dependent binding (Kd 331 ± 58 nM) between ChlD and H. The physical basis for a ChlD–H interaction was investigated using chemical cross-linking coupled with mass spectrometry (XL–MS), together with modifications that either truncate ChlD or modify single residues. We found that the C-terminal integrin I domain of ChlD governs association with ChlH, the Mg2+ dependence of which also mediates the cooperative response of the Synechocystis chelatase to magnesium. The interaction site between the AAA+ motor and the chelatase domain of magnesium chelatase will be essential for understanding how free energy from the hydrolysis of ATP on the AAA+ ChlI subunit is transmitted via the bridging subunit ChlD to the active site on ChlH.
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Paciocco, Adua Elizabeth. "Chinese maintenance and shift among Chinese migrant youth in Prato (Italy) and its connectedness with new formations of Chinese identity." Global Chinese 7, no. 1 (2021): 29–55. http://dx.doi.org/10.1515/glochi-2021-0002.
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Abstract In view of theory sustaining that there is a nexus between linguistic repertoire, language and social identity, and that habitual language choice is not haphazard, this study explores the habitual use of Chinese – hence Chinese language maintenance (CHLM) – among multilingual Chinese migrant youth in Prato (Italy) to understand the social meaning embedded in it. The youth are multilingual; they speak Chinese and Italian. They exhibit CHLM with parents, as parents are not competent speakers of Italian. Some of the youth who are speakers of Italian, speak Chinese with peers, hence exhibiting CHLM within their generational cohort; while others do not, hence exhibiting Chinese language shift (CHLS). Oral data in which the youth self-present, report on others with whom they share social space, and talk about CHLM indicate that youth who speak Chinese with peers are not integrated into mainstream society; conversely, youth who are integrated shift to speaking Italian with peers. The analysis evidences that the youth’s integration is influenced by their social identity formation and other variables; such as their migration history, Chinese demographics in Prato and language ideology. Further, this study reveals that the youth are characterised by heterogeneity and that it is hierarchically ordered, heterogeneity and hierarchical ordering being indexed by the youth’s CHLM/CHLS and their alignment/disalignment with others that feature in their social space. This finding evidences that different enactments of Chinese identity are developing among Chinese migrant youth in Prato, thus de-essentialising Chinese identity. This study is wide reaching since it contributes to research on CHLM, the social identity formation of Chinese migrant youth populations, as well as new forms of Chinese identity emerging outside of the PRC. Data was analysed using the talk-in-interaction method of narrative analysis that studies oral narratives in which tellers seek to make sense of their human experience.
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Sawicki, Artur, Shuaixiang Zhou, Kathrin Kwiatkowski, Meizhong Luo, and Robert D. Willows. "1-N-histidine phosphorylation of ChlD by the AAA+ ChlI2 stimulates magnesium chelatase activity in chlorophyll synthesis." Biochemical Journal 474, no. 12 (2017): 2095–105. http://dx.doi.org/10.1042/bcj20161094.
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Magnesium chelatase (Mg-chelatase) inserts magnesium into protoporphyrin during the biosynthesis of chlorophyll and bacteriochlorophyll. Enzyme activity is reconstituted by forming two separate preactivated complexes consisting of a GUN4/ChlH/protoporphyrin IX substrate complex and a ChlI/ChlD enzyme ‘motor’ complex. Formation of the ChlI/ChlD complex in both Chlamydomonas reinhardtii and Oryza sativa is accompanied by phosphorylation of ChlD by ChlI, but the orthologous protein complex from Rhodobacter capsulatus, BchI/BchD, gives no detectable phosphorylation of BchD. Phosphorylation produces a 1-N-phospho-histidine within ChlD. Proteomic analysis indicates that phosphorylation occurs at a conserved His residue in the C-terminal integrin I domain of ChlD. Comparative analysis of the ChlD phosphorylation with enzyme activities of various ChlI/ChlD complexes correlates the phosphorylation by ChlI2 with stimulation of Mg-chelatase activity. Mutation of the H641 of CrChlD to E641 prevents both phosphorylation and stimulation of Mg-chelatase activity, confirming that phosphorylation at H641 stimulates Mg-chelatase. The properties of ChlI2 compared with ChlI1 of Chlamydomonas and with ChlI of Oryza, shows that ChlI2 has a regulatory role in Chlamydomonas.
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Shin, Ji Hye, and Peggy Albers. "An Analysis of the Effect of a Cyber Home Learning System on Korean Secondary School Students’ English Language Achievement and Attitude." TESL Canada Journal 32, no. 2 (2015): 45. http://dx.doi.org/10.18806/tesl.v32i2.1207.
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This study examined the effectiveness of a Cyber Home Learning System (CHLS), an online learning system currently being employed in South Korea to improve the access and quality of public education as well as to reduce pri- vate tutoring expenditures. The quasi-experimental research design used ex- periment and survey methods to learn about the impact of CHLS on student performance and to ascertain students’ perceptions of the system. The results of the experiment indicated that no statistically significant differences in test performance existed between the experimental and control groups. This finding suggested that CHLS did not have an impact on student performance overall. However, after the data were disaggregated according to ability level, students in the advanced level showed statistically significant differences between the ex- perimental and control groups. Results from the survey indicated that the CHLS was particularly effective for those who are motivated to voluntarily participate in academic activities and who have the capability for self-initiated study. The CHLS can be considered a useful supplement but not a replacement for second- ary private tutoring. To better address the needs of other learners, the English content of CHLS may need to be further modified to match students’ varying proficiency levels and learning styles. Cette étude a porté sur l’efficacité d’un système d’apprentissage en ligne, Cyber Home Learning System – CHLS, actuellement employé en Corée du Sud pour améliorer la qualité de l’éducation publique, en augmenter l’accessibilité, et ré- duire les frais liés aux services de tutorat privé. Le plan de recherche quasi-expé- rimental s’est appuyé sur l’expérimentation et des méthodes d’enquête pour en apprendre sur l’impact du CHLS sur le rendement des élèves et pour confirmer les perceptions qu’ont les élèves du système. Les résultats de l’expérience n’ont indiqué aucune différence statistiquement significative entre le groupe expéri- mental et le groupe témoin, ce qui portait à croire que le CHLS n’avait pas eu d’impact sur le rendement global des élèves. Une fois les données ventilées par niveau de compétence par contre, elles ont révélé des différences statistiquement significatives entre les élèves avancés du groupe expérimental et ceux du groupe témoin. Les résultats de l’enquête ont indiqué que le CHLS était particulièrement efficace chez les élèves motivés à participer aux activités académiques et capables d’apprendre de façon autonome. On peut considérer le CHLS un complément utile à l’apprentissage, mais pas une solution de remplacement aux services de tutorat privé. Afin de mieux répondre aux besoins des autres apprenants, il se peut que le contenu en anglais du CHLS doive être modifié davantage de sorte à refléter les niveaux de compétence et les styles d’apprentissage variés.
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Lin, C., S. C. Popescu, S. C. Huang, P. T. Chang, and H. L. Wen. "A novel reflectance-based model for evaluating chlorophyll concentrations of fresh and water-stressed leaves." Biogeosciences 12, no. 1 (2015): 49–66. http://dx.doi.org/10.5194/bg-12-49-2015.
Full textAbstract:
Abstract. Water deficits can cause chlorophyll degradation which decreases the total concentration of chlorophyll a and b (Chls). Few studies have investigated the effectiveness of spectral indices under water-stressed conditions. Chlorophyll meters have been extensively used for a wide variety of leaf chlorophyll and nitrogen estimations. Since a chlorophyll meter works by sensing leaves absorptance and transmittance, the reading of chlorophyll concentration will be affected by changes in transmittance as if there were a water deficit in the leaves. The overall objective of this paper was to develop a novel and reliable reflectance-based model for estimating Chls of fresh and water-stressed leaves using the reflectance at the absorption bands of chlorophyll a and b and the red edge spectrum. Three independent experiments were designed to collect data from three leaf sample sets for the construction and validation of Chls estimation models. First, a reflectance experiment was conducted to collect foliar Chls and reflectance of leaves with varying water stress using the ASD FieldSpec spectroradiometer. Second, a chlorophyll meter (SPAD-502) experiment was carried out to collect foliar Chls and meter readings. These two data sets were separately used for developing reflectance-based or absorptance-based Chls estimation models using linear and nonlinear regression analysis. Suitable models were suggested mainly based on the coefficient of determination (R2). Finally, an experiment was conducted to collect the third data set for the validation of Chls models using the root mean squared error (RMSE) and the mean absolute error (MAE). In all of the experiments, the observations (real values) of the foliar Chls were extracted from acetone solution and determined by using a Hitachi U-2000 spectrophotometer. The spectral indices in the form of reflectance ratio/difference/slope derived from the Chl b absorption bands (ρ645 and ρ455) provided Chls estimates with RMSE around 0.40–0.55 mg g−1 for both fresh and water-stressed samples. We improved Chls prediction accuracy by incorporating the reflectance at red edge position (ρREP) in regression models. An effective chlorophyll indicator with the form of (ρ645–ρ455)/ρREP proved to be the most accurate and stable predictor for foliar Chls concentration. This model was derived with an R2 of 0.90 (P < 0.01) from the training samples and evaluated with RMSE 0.35 and 0.38 mg g−1 for the validation samples of fresh and water-stressed leaves, respectively. The average prediction error was within 14% of the mean absolute error.
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Phillips, Charles D., Obioma Nwaiwu, Szu-hsuan Lin, Rachel Edwards, Sara Imanpour, and Robert Ohsfeldt. "Concealed Handgun Licensing and Crime in Four States." Journal of Criminology 2015 (June 16, 2015): 1–8. http://dx.doi.org/10.1155/2015/803742.
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Firearm policy in the United States has long been a serious policy issue. Much of the previous research on crime and firearms focused on the effects of states’ passage of concealed handgun licensing (CHL) legislation. Today, given the proliferation of CHL legislation and growing strength of the “pro-gun” movement, the primary policy focus has changed. State legislators now face issues concerning whether and how to increase access to CHLs. Because of this transformation, this research moves away from the research tradition focused on the effect of a legislative change allowing CHLs. Instead, we consider two issues more policy relevant in the current era: What are the dynamics behind CHL licensing? Do increases in concealed handgun licensing affect crime rates? Using county-level data, we found that the density of gun dealers and other contextual variables, rather than changing crime rates, had a significant effect on increases of the rates at which CHLs were issued. We also found no significant effect of CHL increases on changes in crime rates. This research suggests that the rate at which CHLs are issued and crime rates are independent of one another—crime does not drive CHLs; CHLs do not drive crime.
Dissertations / Theses on the topic "CHLS"
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JITTEN, PHILIPPE. "Dossier medical informatise en reeducation fonctionnelle infantile : mise en place du chls (centre hospitalier lyon sud) et problemes juridiques." Lyon 1, 1989. http://www.theses.fr/1989LYO1M388.
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Adams, Nathan Bryce Porritt. "The roles of ChlI and ChlD, the AAA+ subunits of magnesium chelatase." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/3212/.
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Andrade, Fábio Donisete Pezzuto de [UNESP]. "Estudo químico de chás brasileiros." Universidade Estadual Paulista (UNESP), 2003. http://hdl.handle.net/11449/105668.
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andrade_fdp_dr_araiq.pdf: 1855109 bytes, checksum: 3a37481f54c99d03101f6f4b4cb5e5cb (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Neste trabalho apresentamos o estudo químico de plantas que são popularmente utilizadas na forma de infusão. Como parte de nosso projeto, estudamos espécies usadas no tratamento de úlceras gástricas: Quassia amara (Simaroubaceae), Alchornea castaneifolia (Euphorbiaceae), Curatella americana (Dilleniaceae) e Hancornea speciosa (Apocynaceae). Os extratos foram avaliados farmacológicamente em diferente modelos indutores de úlcera para avaliar suas atividades. Os extratos ativos foram fracionados por técnicas cromatograficas e as substâncias identificadas por métodos espectrométricos. Em Quassia amara foram identificados principalmente esteróides e quassinóides; em C. americana foram identificados taninos, catequinas, terpenos e ácidos fenólicos; em A. castaneifolia foram encontrados flavonóides glicosilados e em H. speciosa foram identificados a catequina e o ácido clorogênico. Os extratos contendo essas substâncias apresentam atividade antiúlcera comprovada dando suporte para o uso das plantas pela população. Apresentamos também o estudo fitoquímico de Ilex amara e Ilex theezans, duas plantas da família Aquifoliaceae, que são comumente encontradas como adulterantes de Ilex paraguariensis , o popular mate. Pela análise de I. theezans identificamos triterpenos, saponinas e um derivado sulfatado da arbutina, enquanto que em I. amara identificamos um flavonóide, 11 saponinas, sendo duas inéditas. As técnicas hifenadas de HPLC-RMN e HPLC-MS foram usadas para determinar a composição flavonoídica da infusão de Sorocea bomplandii (Moraceae), um adulterante da espinheira-santa (Maytenus ilicifolia - Celastraceae). Essa abordagem permitiu identificar os flavonóides presentes como constituintes minoritários na infusão e permitiram diferenciar entre a verdadeira e a falsa espinheira santa.<br>In this work we have investigated plants used in folk medicine in the form of infusion. As a part of our project, we studied species used for the treatment of gastric ulcers: Quassia amara (Simaroubaceae), Alchornea castaneifolia (Euphorbiaceae), Curatella americana (Dilleniaceae) and Hancornea speciosa (Apocynaceae). The extracts were submitted to pharmacological evaluation different models to evaluate their antiulcer activities. The active extracts were fractionated by chromatographic techniques and the substances were identified by spectrometric methods. Quassia amara afforded mainly steroids and quassinoids; C. americana gave tannins, catequins, terpenes and phenolic acids; A. castaneifolia afforded glycosilated flavonoids and H. speciosa gave chlorogenic acid and catechin. These substances supported the antiulcer properties found in the investigated extracts. Other species commonly found in Brazil as infusions are Ilex amara and Ilex theezans (Aquifoleaceae), both considered as aduterant of Ilex paraguariensis, the traditional mate. The analyses of Ilex theezans afforded triterpenes, saponins and a new sulphated arbutin derivative, whereas Ilex amara gave one flavonoids and eleven triterpene saponins, two of them are new derivatives. Saponins of I. amara were used to establish chemical differenciation between true and false mates by HPLC-DAD analysis. The HPLC- NMR and HPLC-MS techniques were used determine the flavonoidic composition of aqueous extract of Sorocea bomplandii (Moraceae), an adulterant of espinheira-santa (Maytenus ilicifolia - Celastraceae). This approach allowed to identify the flavonoids present in minor amounts in the infusion and allowed to differenciate between true and false espinheiras-santas.
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Andrade, Fábio Donisete Pezzuto de. "Estudo químico de chás brasileiros /." Araraquara : [s.n.], 2002. http://hdl.handle.net/11449/105668.
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Orientador: Wagner Vilegas<br>Banca: Vanderlan da Silva Bolzani<br>Banca: Alba Regina Monteiro Souza Brito<br>Banca: Mitsue Haraguchi<br>Banca: Joana D'Arc Felicio de Souza<br>Resumo: Neste trabalho apresentamos o estudo químico de plantas que são popularmente utilizadas na forma de infusão. Como parte de nosso projeto, estudamos espécies usadas no tratamento de úlceras gástricas: Quassia amara (Simaroubaceae), Alchornea castaneifolia (Euphorbiaceae), Curatella americana (Dilleniaceae) e Hancornea speciosa (Apocynaceae). Os extratos foram avaliados farmacológicamente em diferente modelos indutores de úlcera para avaliar suas atividades. Os extratos ativos foram fracionados por técnicas cromatograficas e as substâncias identificadas por métodos espectrométricos. Em Quassia amara foram identificados principalmente esteróides e quassinóides; em C. americana foram identificados taninos, catequinas, terpenos e ácidos fenólicos; em A. castaneifolia foram encontrados flavonóides glicosilados e em H. speciosa foram identificados a catequina e o ácido clorogênico. Os extratos contendo essas substâncias apresentam atividade antiúlcera comprovada dando suporte para o uso das plantas pela população. Apresentamos também o estudo fitoquímico de Ilex amara e Ilex theezans, duas plantas da família Aquifoliaceae, que são comumente encontradas como adulterantes de Ilex paraguariensis , o popular mate. Pela análise de I. theezans identificamos triterpenos, saponinas e um derivado sulfatado da arbutina, enquanto que em I. amara identificamos um flavonóide, 11 saponinas, sendo duas inéditas. As técnicas hifenadas de HPLC-RMN e HPLC-MS foram usadas para determinar a composição flavonoídica da infusão de Sorocea bomplandii (Moraceae), um adulterante da espinheira-santa (Maytenus ilicifolia - Celastraceae). Essa abordagem permitiu identificar os flavonóides presentes como constituintes minoritários na infusão e permitiram diferenciar entre a verdadeira e a falsa espinheira santa.<br>Abstract: In this work we have investigated plants used in folk medicine in the form of infusion. As a part of our project, we studied species used for the treatment of gastric ulcers: Quassia amara (Simaroubaceae), Alchornea castaneifolia (Euphorbiaceae), Curatella americana (Dilleniaceae) and Hancornea speciosa (Apocynaceae). The extracts were submitted to pharmacological evaluation different models to evaluate their antiulcer activities. The active extracts were fractionated by chromatographic techniques and the substances were identified by spectrometric methods. Quassia amara afforded mainly steroids and quassinoids; C. americana gave tannins, catequins, terpenes and phenolic acids; A. castaneifolia afforded glycosilated flavonoids and H. speciosa gave chlorogenic acid and catechin. These substances supported the antiulcer properties found in the investigated extracts. Other species commonly found in Brazil as infusions are Ilex amara and Ilex theezans (Aquifoleaceae), both considered as aduterant of Ilex paraguariensis, the traditional mate. The analyses of Ilex theezans afforded triterpenes, saponins and a new sulphated arbutin derivative, whereas Ilex amara gave one flavonoids and eleven triterpene saponins, two of them are new derivatives. Saponins of I. amara were used to establish chemical differenciation between true and false mates by HPLC-DAD analysis. The HPLC- NMR and HPLC-MS techniques were used determine the flavonoidic composition of aqueous extract of Sorocea bomplandii (Moraceae), an adulterant of espinheira-santa (Maytenus ilicifolia - Celastraceae). This approach allowed to identify the flavonoids present in minor amounts in the infusion and allowed to differenciate between true and false espinheiras-santas.<br>Doutor
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Matsubara, Simara. "Polifenois em chas comercializados no Brasil." [s.n.], 2001. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256140.
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Orientador : Delia B. Rodriguez-Amaya<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-07-28T10:34:51Z (GMT). No. of bitstreams: 1
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Previous issue date: 2001<br>Resumo: Os teores de miricetina, quercetina e kaempferol foram determinados em uma marca de ban-chá, duas de chá verde e quatro de chá preto. Analisou-se três lotes para cada marca em duplicata por cromatografia líquida de alta eficiência. Quercetina (2,5 - 3,4 mg/g de folha)
predominou em todas as amostras, seguida por kaempferol (1,0 - 2,0 mg/g de folha), com exceção de uma amostra na qual kaempferol e miricetina tiveram teores iguais. Houve variação entre os tipos de chás e mesmo entre marcas do mesmo tipo. Miricetina (traços - 1,9 mg/g de folha) foi o flavonol que mais variou e que esteve em menor nível nos chás pretos. Amostras de chás muito consumidas no Brasil também foram investigadas quanto à
presença e teor destes flavonóis. Em chás de frutas (maçã e morango) e de ervas (erva doce, camomila, erva cidreira, hortelã, boldo, mate e erva mate), não foi detectada miricetina, enquanto que quercetina foi encontrada em quatro chás (camomila, boldo, morango e erva mate) e kaempferol, em dois chás (boldo e erva-mate), em concentrações de 0,4 a 2,5 e 0,4
a 2,6 mg/g de folha, respectivamente. Conclui-se que estes chás são fontes de flavonóis na dieta brasileira, embora com teores menores que em chás verde e preto. Palavras-chave: chás, flavonóis, miricetina, quercetina, kaempferol<br>Abstract: Not informed<br>Mestrado<br>Mestre em Ciência de Alimentos
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Turečková, Věra. "Personální řízení ve firmě CHPS s.r.o." Master's thesis, Vysoká škola ekonomická v Praze, 2008. http://www.nusl.cz/ntk/nusl-11053.
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The purpose of this dissertation is to review the work of the personnel department at a chosen company. The theoretical-methodological part contains the description of the personnel dep. activity with the regard to the importance for a small company. The analytical part includes the analysis of the current process of the individual personnel activities and the description of the revealed weaknesses. The final part summarize the found facts and contains my recommendations to the member of the personnel department.
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Guay, Daniel. "Étude thermodynamique des systèmes monomoléculaires mixtes CHL a/a-TQ, CHL a/PQ 2, CHL a/PQ 3 et CHL a/PQ 9 à l'interface air-eau." Thèse, Université du Québec à Trois-Rivières, 1986. http://depot-e.uqtr.ca/6047/1/000556260.pdf.
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Loureiro, Liliana Maria Esteves Fernandes. "Desenvolvimento de um fluído biocombustível à base de carvão vegetal." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/15331.
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Mestrado em Engenharia de Materiais<br>Este trabalho relata os resultados de um estudo preliminar inovador, visando o desenvolvimento de um combustível industrial líquido à base de carvão vegetal. A sua pertinência justifica-se pelo elevado potencial energético do carvão vegetal, a sua natureza renovável, a facilidade de armazenamento e de transporte na forma líquida, bem como todas as vantagens económicas e ambientais associadas.
Assim, estudou-se a aptidão do carvão vegetal para ser disperso em meios líquidos adequados através do comportamento reológico dessas suspensões. Este tipo de informação é da maior importância para o dimensionamento de tubagens de transporte do fluido e para o desenho dos sistemas de armazenamento.
Para o efeito, avaliou-se a influência dos factores mais relevantes que devem ser considerados aquando da preparação de suspensões e que determinam o seu comportamento reológico: (i) a concentração de carvão da suspensão, que deve ser tão elevada quanto possível para não comprometer o poder calorífico; (ii) a quantidade de aditivos/ estabilizantes para minimizar a viscosidade (μ) a uma dada fracção de sólidos; (iii) o tipo de aditivos, iónicos (catiónicos/ aniónicos) ou não iónicos; (iv) e o tamanho de partículas e a sua distribuição granulométrica, que interferem na taxa de sedimentação e na capacidade de empacotamento das partículas.
Inicialmente a investigação focou-se na preparação de suspensões de carvão vegetal-água, Charcoal Water Slurries (ChWS). Testaram-se quatro dispersantes e escolheu-se o mais adequado às ChWS. A seguir determinou-se a concentração máxima de sólidos, permitida com esse dispersante. A avaliação dos resultados obtidos conduziu a uma segunda etapa: a substituição da água como meio de dispersão, por outro solvente. Para o efeito testaram-se três óleos e seleccionou-se aquele que permitia maximizar a concentração de sólidos nas suspensões carvão vegetal-óleo, Charcoal Oil Slurries (ChOS).
Seguidamente testaram-se três dispersantes e determinou-se a concentração máxima de sólidos permitida utilizando o dispersante mais adequado. Verificou-se também a influência da distribuição do tamanho de partícula e do uso de sistemas mono, bi e multimodais na viscosidade da suspensão.
Estes estudos conduziram a uma suspensão de carvão vegetal-óleo de elevada estabilidade, contendo 62 wt.% de sólidos e 0,35 wt.% de dispersante. Esta ChOS apresentava propriedades de fluxo adequadas e elevado poder calorífico, tendo sido alcançados com sucesso os objectivos propostos para este trabalho.<br>This work reports the results of a ground-breaking preliminary study aiming developing an industrial liquid fuel from charcoal. Its relevance is justified by the high energy potential of charcoal, its renewable nature, easiness of storage and transportation in liquid form, as well as all the associated economic and environmental advantages.
Therefore, the ability of charcoal to be dispersed in different solvents was studied by evaluating the rheological behaviour of the resulting suspensions. Such information is of utmost importance for the dimensioning of the fluid transport pipe and the design of the storage systems.
For this purpose, the effects of the most relevant factors that influence the rheological properties of the suspensions were evaluated, which include: (i) the charcoal content, which should be as high as possible to do not compromise the calorific value; (ii) the amount of additives / stabilizers to minimize the viscosity (μ) at a given solids fraction; (iii) the type of additives, ionic (cationic / anionic) or non-ionic; (iv) the size of particles and their size distribution, which interfere with sedimentation and the packing ability of the particles.
Initially, research has focused on the preparation of charcoal-water slurries (ChWS). There were tested four surfactants and it was chosen the most appropriate to ChWS. Then it was determined the maximum charcoal content allowed with this surfactant. The evaluation of the results led to a second step: replacing water as a dispersion medium by another solvent. To this end three oils were tested and it was selected the one that allowed maximizing the solids content in the ChOS.
Then three surfactants were tested to determine the maximum charcoal content permitted using the most appropriate surfactant. The influences of the particle size distribution and the use of mono, bi and multimodal systems in the viscosity of the slurries were also studied.
These studies have led to a high-stability charcoal oil slurry containing 62 wt.% solids and 0.35 wt.% dispersant. This ChOS exhibited adequate flow properties and high calorific value, thereby enabling to successfully achieving the proposed objectives for this work.
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Levy, Melanie E. "Survey analysis| Methodology and application using CHIS data." Thesis, California State University, Long Beach, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1527014.
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<p> Over the past hundred years, advancements in survey research and understanding of survey methodology and analysis have removed major biases when small numbers of respondents can speak for larger groups in addition to the ability of modem polls to support inferences about populations. This project presents a brief history of survey methodology and utilizes common applied statistical procedures using the 2009 California Health Interview Survey (CHIS). Survey methodology and analysis will be explored through examples including survey linear regression analysis, canonical correlation and multinomial logistic regression. </p><p> This project's goal is to create greater understanding of the survey analysis process, as well as, some of the challenges survey researchers face. With this knowledge more procedures can be adapted to incorporate survey design to expand survey methodology and analysis to reach more diverse research needs. </p>
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Barroso, Maria de Fátima de Sá. "Capacidade Antioxidante de Águas Aromatizadas: Água e Chás." Tese, Faculdade de Farmácia da Universidade do Porto, 2010. http://hdl.handle.net/10216/62340.
Full textBooks on the topic "CHLS"
More sourcesBook chapters on the topic "CHLS"
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Kumazaki, S., M. Iwaki, I. Ikegami, H. Kandori, S. Itoh, and K. Yoshihara. "Primary Electron-Transfer Steps in Photosystem I Reaction Center with Reduced Number of Antenna Chlorophylls (12–30 Chls/P700)." In Springer Series in Chemical Physics. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-85176-6_178.
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Cammarata, Kirk, F. Gerald Plumley, and Gregory W. Schmidt. "Reconstitution of Light Harvesting Complexes: A Single Apoprotein Binds CHLa, CHLb, and Xanthophylls." In Current Research in Photosynthesis. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_302.
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Peters, Nils, Martin Dichgans, Sankar Surendran, et al. "CHS." In Encyclopedia of Molecular Mechanisms of Disease. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-29676-8_7597.
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Vogt, J. "75 CH2S Thioformaldehyde." In Asymmetric Top Molecules. Part 1. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10371-1_77.
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Vogt, J. "91 CH4S Methanethiol." In Asymmetric Top Molecules. Part 1. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10371-1_93.
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Köhler, Christian. "CHILS Framework – Applications." In Enhancing Embedded Systems Simulation. Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9916-3_10.
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Köhler, Christian. "CHILS Framework – Concept." In Enhancing Embedded Systems Simulation. Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9916-3_8.
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Köhler, Christian. "CHILS Framework – Classification." In Enhancing Embedded Systems Simulation. Vieweg+Teubner, 2011. http://dx.doi.org/10.1007/978-3-8348-9916-3_9.
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Fabbri, Nicola, and Davide Donati. "Chondrosarcomas (CHS)." In Atlas of Musculoskeletal Tumors and Tumorlike Lesions. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01748-8_25.
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Donati, Davide Maria, and Giuseppe Bianchi. "Chondrosarcomas (CHS)." In Diagnosis of Musculoskeletal Tumors and Tumor-like Conditions. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-29676-6_34.
Full textConference papers on the topic "CHLS"
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Sakurai, Akira, and Katsuya Fukuda. "Mechanisms of Subcooled Pool Boiling CHFS Depending on Subcooling, Pressure, and Test Heater Configurations and Surface Conditions in Liquids." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39066.
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The measured subcooled pool boiling CHFs on a horizontal cylinder heater for subcoolings with pressures as a parameter in water, liquid nitrogen, liquid helium etc. were previously well described by the subcooled pool boiling CHF correlations newly derived assuming two different CHF mechanisms resulting from hydrodynamic instability (HI) and heterogeneous spontaneous nucleation in originally flooded cavities (HSN): the CHFs for lower subcoolings which depend on pressure, and the CHFs for higher subcoolings which were almost independent of pressure in water extremely disagreed with corresponding values derived from existing subcooled pool boiling CHF correlations only based on hydrodynamic instability except the CHFs near saturated condition. In the present paper, to begin with the effect of heater configuration on the CHFs resulting from the HI and the HSN were clarified using the existing CHF data measured for the horizontal cylinders with diameters ranging from 0.2 to 5.84 mm, and the test ribbon heaters with different shapes for subcoolings ranging from zero to about 160 K at pressures ranging from 0.013 to 2 MPa in water and ethanol etc., and next the effects of horizontal cylinder surface conditions on the CHFs resulting from the HI and the HSN were clarified using the CHF data measured by the authors for 1.2 mm-diam. platinum horizontal cylinders with commercial, rough and mirror surfaces (CS, RS and MS) in water for the wide ranges of subcooling and pressure. The CHFs for subcoolings at a pressure measured using a horizontal cylinder, first increased up to the maximum CHF, secondly decreased down to the minimum CHF, and finally again increased monotonously with an increase in subcooling as a typical trend; namely the CHFs were divided into three groups of first, second and third ones for low, middle (transition) and high subcoolings respectively. However, the CHFs for middle subcoolings became insignificant, and the CHFs resulting from the HI or the HSN for all subcoolings including zero occurred depending on pressure, heater configuration, its surface conditions and a kind of liquid. The effect of cylinder diameters on the coefficients in the two CHF correlations representing CHFs resulting from the HI and the HSN previously presented were clarified in the liquids. It was confirmed that there existed the CHFs resulting from the HI measured for the horizontal cylinders with CS, RS and MS at lower pressures for lower subcoolings; the CHFs almost agreed with one another at the same subcooling independently of the surface conditions, though the CHFs resulting from the HSN for the MS cylinder were extremely lower corresponding CHFs for CS and RS cylinder at higher pressures. It should be noted that the CHFs resulting from the HSN predominated and on the other hand the CHF resulting from the HI existed in extremely narrow regions in a large number of the CHF data measured for the wide ranges of the conditions not only in wetting liquids but also in water.
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Bushroe, R. G., S. DasGupta, A. Dengi, et al. "Chip hierarchical design system (CHDS)." In the 1997 international symposium. ACM Press, 1997. http://dx.doi.org/10.1145/267665.267720.
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dos Santos Pereira, Ana Julia, and Fabíola Dorneles Inácio. "Avaliação do potencial antioxidante de chás." In Simpósio de Bioquímica e Biotecnologia. Galoa, 2017. http://dx.doi.org/10.17648/simbbtec-2017-80770.
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Lee, Yuan-Pern. "Spectroscopic studies of small radicals (CH3S)." In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, edited by Cheuk Yiu Ng. SPIE, 1993. http://dx.doi.org/10.1117/12.143113.
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Hata, Koichi, Toshiyuki Sato, Takeya Tanimoto, Masahiro Shiotsu, and Nobuaki Noda. "Critical Heat Fluxes of Subcooled Water Flow Boiling Against Outlet Subcooling in Short Vertical Tube." In 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22324.
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The critical heat fluxes (CHFs) of subcooled water flow boiling are systematically measured for the flow velocities (u = 4.0 to 13.3 m/s), the outlet subcoolings (ΔTsub,out = 3 to 129 K) and the outlet pressure (Pout = 800 kPa). The SUS304 test tubes of 3, 6, 9 and 12 mm in inner-diameter, d, and 33, 66, 99 and 133 mm in length, L, respectively for L/d = 11 are used. The CHFs first become lower and then become higher with the increase in subcooling. The CHFs for four different inner-diameters with L/d = 11 measured here become higher with the decrease in the diameter. CHF correlation for the latter increasing regime was given in non-dimensional form against average outlet subcoolings based on the experimental data. The correlation can describe not only the CHFs obtained in this work at the outlet pressure of 800 kPa but also the authors’ published CHFs (1284 points) for the wide range of Pout = 159 kPa to 1 MPa, d = 6, 9 and 12 mm, L = 49, 99 and 149 mm, ΔTsub,out = −4 to 130 K and u = 4.0 to 13.3 m/s within 15% difference for 50 K≤ΔTsub,out≤130 K and within +30 to −10% for 30 K<ΔTsub,out<50 K.
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Bistarelli, Stefano, Thom Frühwirth, and Michael Marte. "Soft constraint propagation and solving in CHRs." In the 2002 ACM symposium. ACM Press, 2002. http://dx.doi.org/10.1145/508791.508793.
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Khattak, Chandra P., Joshua Filgate, Raj Shetty, C. Richard Schwerdtfeger, and Saurabh Ullal. "20-inch diameter CHES® sapphire boules." In SPIE Defense + Security, edited by Brian J. Zelinski. SPIE, 2015. http://dx.doi.org/10.1117/12.2180647.
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Fitri, Sutopo P., Katsuya Fukuda, Qiusheng Liu, and Jongdoc Park. "Transient Pool Boiling Critical Heat Flux of FC-72 Under Saturated Conditions." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89394.
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In this study, the steady-state and transient critical heat fluxes (CHFs) in pool boiling were measured on 1.0 mm diameter horizontal cylinders of gold and platinum heaters under saturated conditions due to transient heat inputs, Q0exp(t/τ), in a pool of Fluorinert FC-72. Heaters were heated by electric current with the periods, τ, ranged from 10 ms to 20 s, and the pressures ranged from atmospheric up to around 1.2 MPa. The steady-state CHFs measured are dependent on pressure and almost agree with the values obtained by Kutateladze’s correlation based on hydrodynamic instability (HI) model. It was considered that the boiling inception and the direct transition during the steady-state period occur by the pre-pressure of ∼1.2 MPa. The trend of typical transient CHFs were clearly divided into the first, second, and third groups for long, short, and intermediate periods, respectively. The direct transition processes to film boiling without nucleate boiling for the short periods obtained from both heaters were confirmed due to the heterogeneous spontaneous nucleation (HSN) in flooded cavities on the cylinder surface. The empirical correlations to express each of corresponding CHFs measured on both heaters for the short periods are presented in this paper.
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Fukuda, Katsuya, and Qiusheng Liu. "Non-Linear Characteristics of Saturated and Subcooled Pool Boiling CHF for Various Test Heater Configuration." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75269.
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Many aspects of saturated and subcooled pool boiling CHF in liquids have been investigated by many researchers for pressure, subcooling, test heater configurations, thermal properties, etc., assuming a CHF model mainly based on a kind of hydrodynamic instability at CHF with a linear relation of CHF for subcooling at a pressure for about a half century until now. Recently it was clarified that the CHFs measured were mainly divided into two groups for lower and higher subcooling at a pressure as a typical case. It was assumed that the former and latter CHFs occur due to hydrodynamic instability (HI) and explosive-like heterogeneous spontaneous nucleation (HSN) respectively. It was attempted to clarify in the present paper the effect of test heater configurations on the saturated and subcooled pool boiling CHFs resulting from the HI and the HSN using existing data for horizontal test cylinders with the diameters ranging from 0.2 to 5 mm, a vertical cylinder, a vertically oriented rectangular ribbon and a horizontally suspended vertically oriented rectangular ribbon in liquids by the authors and other researchers. The CHF correlations representing the CHFs resulting from the HI and the empirical correlation resulting with HSN including test heater configuration effects respectively were suggested.
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Hata, Koichi, Hirokazu Komori, Masahiro Shiotsu, and Nobuaki Noda. "Influence of Dissolved Gas Concentration on Subcooled Flow Boiling Critical Heat Flux in Short Vertical Tube." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49194.
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The subcooled flow boiling critical heat fluxes (CHFs) are systematically measured by using the water loop installed the pressurizer to investigate the pressurization gas effect for the flow velocities (u = 4.0 to 13.3 m/s), the inlet subcoolings (ΔTsub,in = 70.08 to 145.57 K) and the inlet pressure (Pin = 740.67 to 975.43 kPa). The SUS304 tube of the inner diameter (d = 3 mm), the heated length (L = 66.5 mm) and L/d = 22.17 with the inner surface of rough finished was used. The CHF data under the pressurization by saturated vapor in a pressurizer were compared with the values calculated from the CHF correlations against outlet and inlet subcoolings based on the experimental data under the nitrogen (N2) gas pressure previously obtained. The CHFs for the dissolved oxygen concentration of 6.59, 4, 2, 1, 0.5, 0.0496 and 0.0265 ppm were systematically measured for the flow velocities (u = 4.0 to 13.3 m/s), the inlet subcoolings (ΔTsub,in = 137.49 to 153.87 K) and the inlet pressure (Pin = 762.97 to 975.78 kPa). And the CHFs for the test tube with the smooth finished inner surface were measured at the dissolved oxygen concentration of 0.1004 and 0.0413 ppm for the same experimental conditions. Influence of the inner surfaces of rough and smooth finished on the CHFs was clarified for low dissolved gas concentration.
Reports on the topic "CHLS"
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Westphal, Richard J., William L. Goodman, and Robert J. Amaya. Personnel Data Congruence Between SAMS and CHCS. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada461442.
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Alptekin, G�khan O., Ambalavanan Jayataman, Matthew Schaefer, Michael Ware, Jennifer Hunt, and Frank Dobek. Novel Sorbent to Clean Up Biogas for CHPs. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1222699.
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Keesee, M. S., and B. S. Bevins. The CEBAF control system for the CHL. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/268541.
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Turner, Wesley. Learning the Language of Healthcare Enabling Semantic Web Technology in CHCS. Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada601078.
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Masuzaki, S., A. Komori, and T. Morisaki. Edge plasma control using an LID configuration on CHS. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/634041.
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Chronis, W. C., D. M. Arenius, B. S. Bevins, et al. Procurement and commissioning of the CHL refrigerator at CEBAF. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/270822.
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Ntsua, Stephen, Placide Tapsoba, Gloria Asare, and Frank Nyonator. Repositioning community-based family planning in Ghana: A case study of Community-based Health Planning and Services (CHPS). Population Council, 2012. http://dx.doi.org/10.31899/rh2.1053.
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Torres, Marissa, Norberto Nadal-Caraballo, and Alexandros Taflanidis. Rapid tidal reconstruction for the Coastal Hazards System and StormSim part II : Puerto Rico and U.S. Virgin Islands. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41482.
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This Coastal and Hydraulics Engineering Technical Note (CHETN) describes the continuing efforts towards incorporating rapid tidal time-series reconstruction and prediction capabilities into the Coastal Hazards System (CHS) and the Stochastic Storm Simulation System (StormSim). The CHS (Nadal-Caraballo et al. 2020) is a national effort for the quantification of coastal storm hazards, including a database and web tool (https://chs.erdc.dren.mil) for the deployment of results from the Probabilistic Coastal Hazard Analysis (PCHA) framework. These PCHA products are developed from regional studies such as the North Atlantic Coast Comprehensive Study (NACCS) (Nadal-Caraballo et al. 2015; Cialone et al. 2015) and the ongoing South Atlantic Coast Study (SACS). The PCHA framework considers hazards due to both tropical and extratropical cyclones, depending on the storm climatology of the region of interest. The CHS supports feasibility studies, probabilistic design of coastal structures, and flood risk management for coastal communities and critical infrastructure. StormSim (https://stormsim.erdc.dren.mil) is a suite of tools used for statistical analysis and probabilistic modeling of historical and synthetic storms and for stochastic design and other engineering applications. One of these tools, the Coastal Hazards Rapid Prediction System (CHRPS) (Torres et al. 2020), can perform rapid prediction of coastal storm hazards, including real-time hurricane-induced flooding. This CHETN discusses the quantification and validation of the Advanced Circulation (ADCIRC) tidal constituent database (Szpilka et al. 2016) and the tidal reconstruction program Unified Tidal analysis (UTide) (Codiga 2011) in the Puerto Rico and U.S. Virgin Islands (PR/USVI) coastal regions. The new methodology discussed herein will be further developed into the Rapid Tidal Reconstruction (RTR) tool within the StormSim and CHS frameworks.
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Sharp, Jeremy, Locke Williams, Duncan Bryant, et al. Rough River Outlet Works physical model study. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41043.
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The US Army Corps of Engineers, Louisville District, requested the support and assistance of the US Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory (CHL), in the evaluation of the hydraulic performance of the replacement Outlet Works for Rough River Dam. To support the design effort, CHL constructed a 1:25.85 scale physical model. The proposed features of the model in the domain are the curved approach channel, intake structure, transition, curved conduit, stilling basin, concrete apron, and retreat channel. Tests performed to evaluate the hydraulic performance illuminated a few design concerns. To address these issues, several key design changes were made. These included the retreat channel slope, end sill design, and transition design.
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Tweet, Justin S., Vincent L. Santucci, Kenneth Convery, Jonathan Hoffman, and Laura Kirn. Channel Islands National Park: Paleontological resource inventory (public version). National Park Service, 2020. http://dx.doi.org/10.36967/nrr-2278664.
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Channel Island National Park (CHIS), incorporating five islands off the coast of southern California (Anacapa Island, San Miguel Island, Santa Barbara Island, Santa Cruz Island, and Santa Rosa Island), has an outstanding paleontological record. The park has significant fossils dating from the Late Cretaceous to the Holocene, representing organisms of the sea, the land, and the air. Highlights include: the famous pygmy mammoths that inhabited the conjoined northern islands during the late Pleistocene; the best fossil avifauna of any National Park Service (NPS) unit; intertwined paleontological and cultural records extending into the latest Pleistocene, including Arlington Man, the oldest well-dated human known from North America; calichified “fossil forests”; records of Miocene desmostylians and sirenians, unusual sea mammals; abundant Pleistocene mollusks illustrating changes in sea level and ocean temperature; one of the most thoroughly studied records of microfossils in the NPS; and type specimens for 23 fossil taxa. Paleontological research on the islands of CHIS began in the second half of the 19th century. The first discovery of a mammoth specimen was reported in 1873. Research can be divided into four periods: 1) the few early reports from the 19th century; 2) a sustained burst of activity in the 1920s and 1930s; 3) a second burst from the 1950s into the 1970s; and 4) the modern period of activity, symbolically opened with the 1994 discovery of a nearly complete pygmy mammoth skeleton on Santa Rosa Island. The work associated with this paleontological resource inventory may be considered the beginning of a fifth period. Fossils were specifically mentioned in the 1938 proclamation establishing what was then Channel Islands National Monument, making CHIS one of 18 NPS areas for which paleontological resources are referenced in the enabling legislation. Each of the five islands of CHIS has distinct paleontological and geological records, each has some kind of fossil resources, and almost all of the sedimentary formations on the islands are fossiliferous within CHIS. Anacapa Island and Santa Barbara Island, the two smallest islands, are primarily composed of Miocene volcanic rocks interfingered with small quantities of sedimentary rock and covered with a veneer of Quaternary sediments. Santa Barbara stands apart from Anacapa because it was never part of Santarosae, the landmass that existed at times in the Pleistocene when sea level was low enough that the four northern islands were connected. San Miguel Island, Santa Cruz Island, and Santa Rosa Island have more complex geologic histories. Of these three islands, San Miguel Island has relatively simple geologic structure and few formations. Santa Cruz Island has the most varied geology of the islands, as well as the longest rock record exposed at the surface, beginning with Jurassic metamorphic and intrusive igneous rocks. The Channel Islands have been uplifted and faulted in a complex 20-million-year-long geologic episode tied to the collision of the North American and Pacific Places, the initiation of the San Andreas fault system, and the 90° clockwise rotation of the Transverse Ranges, of which the northern Channel Islands are the westernmost part. Widespread volcanic activity from about 19 to 14 million years ago is evidenced by the igneous rocks found on each island.