40 research outputs found
Arsenic Removal for Drinking Water Production in Rural Nicaraguan Communities
No full textSanitary Engineerin
Arsenic contamination of rural community wells in Nicaragua: A review of two decades of experience
No full textSeveral surveys have been conducted in Nicaragua between 1996 and 2015 confirming the presence of high levels of arsenic (>10 μg/L). In this paper, these peer-reviewed (n = 2) and non-peer reviewed sources (n = 14) have been combined to provide an extensive overview of the arsenic contamination of drinking water sources in Nicaragua. So far, arsenic contamination has been detected in over 80 rural communities located in 34 municipalities of the country and arsenic poisoning has been identified in at least six of those communities. The source of arsenic contamination in Nicaragua is probably volcanic in origin, both from volcanic rocks and geothermal fluids which are distributed across the country. Arsenic may have directly entered into the groundwater by geothermally-influenced water bodies, or indirectly by reductive dissolution or alkali desorption, depending on the local geochemical conditions.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Sanitary Engineerin
Developing Reading Identities: Understanding Issues of Motivation within the Reading Workshop
Get PDFEmpirical evidence suggests a correlation between motivation and reading achievement as well as a decline in motivation as students progress through the grades. In order to address this issue, it is necessary to determine the instructional methods that promote motivation and identity development in reading. This study examines the motivation and the identity development of four fourth grade students as they experienced the reading workshop over the course of one year. Ford’s Motivational Systems Theory and Wenger’s Theory of Learning frame the study of student motivation and identity development within the reading workshop. Data related to motivation and identity development was collected weekly through student interviews, surveys, and conferences. A description of the context was gained through researcher observations and a teacher interview. Analysis of this data revealed that (1) Increased time spent reading self- selected books correlates positively to student motivation and identity development. (2) Increased responsive feedback from teachers and peers is correlated with increased motivation and reading identity development. (3) These elements form the crux of the reading workshop, which supports the notion that this model of instruction encourages motivation and identity development. (4) The correlation between motivation, identity development, and achievement is not evident in the context of this study. However, this correlation often emerges over time. This dissertation concludes with directions for future research, which may contribute to a further understanding of the relationship between student motivation, identity development and the reading workshop
As(V) rejection by NF membranes using high temperature sources for drinking water production
No full textIn Nicaragua, a Central American country, geothermally influenced waters are frequently found to be contaminated with arsenic (as As(V)). This study investigated the effect of high-temperatures (25–50 °C), as found in geothermally influenced source waters, on the rejection of monovalent H2AsO4 - and divalent HAsO4 2- species (at pH 6,7 and 8) during NF membrane filtration of a multi-component solution containing Cl- and HCO3 -. In this multi-component solution, As(V) rejection was found to be enhanced at higher temperatures, which was in contrast to the previous assumption that temperature increase would have a negative effect on As(V) rejection. Previous studies were conducted with deionized waters, where pore size expansion and decreased viscosity drove As(V) rejection; however, in the presence of other anions such as those utilized in this study, As(V) rejection was promoted at higher temperatures. The enhancement of As(V) rejection at high temperature was associated with the presence of HCO3 - and Cl-, which are considerably more permeable than both As(V) species. An additional advantage of the higher temperature was the lower feed pressure (down to 1.5 bar) needed to operate these NF membranes, compared to colder waters. The lower energy consumption in combination with the improvement in As(V) rejection at higher temperatures shows the potential application of this technology for efficient treatment of As(V) contaminated, geothermally influenced waters for decentralised, rural drinking water production, in As-affected countries such Nicaragua.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Sanitary Engineerin
Arsenic removal from geothermal influenced groundwater with low pressure NF pilot plant for drinking water production in Nicaraguan rural communities
No full text This research evaluated the effect of different fluxes (16, 23 & 30 L/m 2 h) and temperatures (31,35 & 43 °C) on the rejection of As(V) during nanofiltration (NF) of natural geothermal influenced groundwater in Nicaragua. A NF pilot plant powered by solar panels was built and operated in rural community Telica, exposed to As-rich drinking water sources due to geothermal influences. The results showed that even at high temperatures it is possible to obtain high rejection of As(V) (0.87–0.9) during NF filtration (recovery 10%; flux 16 L/m 2 h) of geothermal influenced groundwater, with the additional advantage of requiring low operating pressures (1.2 bar ~ 12mwc). The permeate concentration (~5 μg/L) complied with the WHO guideline for drinking water and the concentrate (~55 μg/L) could be used by local villagers for daily activities (e.g., laundry and bathing). For all investigated fluxes and temperatures the order of rejection of As(V) (as HAsO 4 2− ), compared with the other anions, could be interpreted on the basis of its charge, hydrated radius and hydration free energy. At lower temperatures (31 and 35 °C) permeate quality improved slightly (~3 μg/L), but although an increased temperature had a negative effect on the As rejection, As concentrations in the permeate never exceeded 5 μg/L, while the required TMP dropped - depending on the flux - with 0.5 to 1 bar. This decrease in required pressure might be of huge benefit in deserted, rural locations where electricity is scarce, as with an overhead tank of 10–15 m a gravity-fed NF system would be feasible. Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Sanitary Engineerin
Study of D0 decays into K̄0 and K̄*0
Get PDFcomplete author list: Procario M.; Yang S.; Akerib D.; Barish B.; Chadha M.; Chan S.; Cowen D.; Eigen G.; Miller J.; Urheim J.; Weinstein A.; Acosta D.; Athanas M.; Masek G.; Ong B.; Paar H.; Sivertz M.; Bean A.; Gronberg J.; Kutschke R.; Menary S.; Morrison R.; Nakanishi S.; Nelson H.; Nelson T.; Richman J.; Tajima H.; Schmidt D.; Sperka D.; Witherell M.; Ballest R.; Daoudi M.; Ford W.; Johnson D.; Lingel K.; Lohner M.; Rankin P.; Smith J.; Alexander J.; Bebek C.; Berkelman K.; Besson D.; Browder T.; Cassel D.; Cho H.; Coffman D.; Drell P.; Ehrlich R.; Galik R.; Garcia-Sciveres M.; Geiser B.; Gittelman B.; Gray S.; Hartill D.; Heltsley B.; Honscheid K.; Jones C.; Jones S.; Kandaswamy J.; Katayama N.; Kim P.; Kreinick D.; Ludwig G.; Masui J.; Mevissen J.; Mistry N.; Ng C.; Nordberg E.; Ogg M.; O'Grady C.; Patterson J.; Peterson D.; Riley D.; Sapper M.; Selen M.; Worden H.; Worris M.; Würthwein F.; Avery P.; Freyberger A.; Rodriquez R.; Stephens R.; Yelton J.; Cinabro D.; Henderson S.; Kinoshita K.; Liu T.; Saulnier M.; Wilson R.; Yamamoto H.; Sadoff A.; Ammar R.; Ball S.; Baringer P.; Coppage D.; Copty N.; Davis R.; Hancock N.; Kelly M.; Kwak N.; Lam H.; Kubota Y.; Lattery M.; Nelson J.; Patton S.; Perticone D.; Poling R.; Savinov V.; Schrenk S.; Wang R.; Alam M.; Kim I.; Nemati B.; O'Neill J.; Romero V.; Severini H.; Sun C.; Zoeller M.; Crawford G.; Fulton R.; Gan K.; Kagan H.; Kass R.; Lee J.; Malchow R.; Morrow F.; Skovpen Y.; Sung M.; White C.; Whitmore J.; Wilson P.; Butler F.; Fu X.; Kalbfleisch G.; Lambrecht M.; Ross W.; Skubic P.; Snow J.; Wang P.; Wood M.; Bortoletto D.; Brown D.; Dominick J.; Mcilwain R.; Miao T.; Miller D.; Modesitt M.; Schaffner S.; Shibata E.; Shipsey I.; Wang P.; Battle M.; Ernst J.; Kroha H.; Roberts S.; Sparks K.; Thorndike E.; Wang C.; Sanghera S.; Skwarnicki T.; Stroynowski R.; Artuso M.; Goldberg M.; Horwitz N.; Kennett R.; Moneti G.; Muheim F.; Playfer S.; Rozen Y.; Rubin P.; Stone S.; Thulasidas M.; Zhu G.; Barnes A.; Bartelt J.; Csorna S.; Egyed Z.; Jain V.; Sheldon P.; Egyed Z.; Csorna S.; Sheldon P.; Jain V.; Zhu G.; Thulasidas M.; Bartelt J.; Barnes A.; Stone S.; Procario M.</p
Author Correction:Examining the healthy human microbiome concept (Nature Reviews Microbiology, (2025), 23, 3, (192-205), 10.1038/s41579-024-01107-0)
Get PDFCorrection to: Nature Reviews Microbiologyhttps://doi.org/10.1038/s41579-024-01107-0, published online 23 October 2024 In the version of the article initially published, Julie Rodriguez’s surname appeared incorrectly as Rodriquez and has now been amended in the HTML and PDF versions of the article.</p
Commentary on “Does Weight Status Impact Metabolic Health in Adolescents When Controlling for Physical Fitness?”
No full textParticipatory identification of indicators for assessing options for climate compatible development of smallholder farmers in the Central Rift Valley of Ethiopia.
No full textImproved measurement of the Bd0 -B̄d0 oscillation frequency
No full textcomplete author list: Buskulic D.; De Bonis I.; Decamp D.; Ghez P.; Goy C.; Lees J.; Lucotte A.; Minard M.; Nief J.; Odier P.; Pietrzyk B.; Casado M.; Chmeissani M.; Crespo J.; Delfino M.; Efthymiopoulos I.; Fernandez E.; Fernandez-Bosman M.; Garrido L.; Juste A.; Martinez M.; Orteu S.; Padilla C.; Park I.; Pascual A.; Perlas J.; Riu I.; Sanchez F.; Teubert F.; Colaleo A.; Creanza D.; De Palma M.; Gelao G.; Girone M.; Iaselli G.; Maggi G.; Maggi M.; Marinelli N.; Nuzzo S.; Ranieri A.; Raso G.; Ruggieri F.; Selvaggi G.; Silvestris L.; Tempesta P.; Tricomi A.; Zito G.; Huang X.; Lin J.; Ouyang Q.; Wang T.; Xie Y.; Xu R.; Xue S.; Zhang J.; Zhang L.; Zhao W.; Alemany R.; Bazarko A.; Bonvicini G.; Bright-Thomas P.; Cattaneo M.; Comas P.; Coyle P.; Drevermann H.; Forty R.; Frank M.; Hagelberg R.; Harvey J.; Janot P.; Jost B.; Kneringer E.; Knobloch J.; Lehraus I.; Lutters G.; Martin E.; Mato P.; Minten A.; Miquel R.; Mir L.; Moneta L.; Oest T.; Pacheco A.; Pusztaszeri J.; Ranjard F.; Rensing P.; Rizzo G.; Rolandi L.; Schlatter D.; Schmelling M.; Schmitt M.; Schneider O.; Tejessy W.; Tomalin I.; Venturi A.; Wachsmuth H.; Wagner A.; Ajaltouni Z.; Barrès A.; Boyer C.; Falvard A.; Gay P.; Guicheney C.; Henrard P.; Jousset J.; Michel B.; Monteil S.; Montret J.; Pallin D.; Perret P.; Podlyski F.; Proriol J.; Rosnet P.; Rossignol J.; Fearnley T.; Hansen J.; Hansen J.; Hansen J.; Hansen P.; Nilsson B.; Rensch B.; Wäänänen A.; Kyriakis A.; Markou C.; Simopoulou E.; Siotis I.; Vayaki A.; Zachariadou K.; Blondel A.; Bonneaud G.; Brient J.; Bourdon P.; Rougé A.; Rumpf M.; Valassi A.; Verderi M.; Videau H.; Candlin D.; Parsons M.; Focardi E.; Parrini G.; Corden M.; Georgiopoulos C.; Jaffe D.; Antonelli A.; Bencivenni G.; Bologna G.; Bossi F.; Campana P.; Capon G.; Casper D.; Chiarella V.; Felici G.; Laurelli P.; Mannocchi G.; Murtas F.; Murtas G.; Passalacqua L.; Pepe-Altarelli M.; Curtis L.; Dorris S.; Halley A.; Knowles I.; Lynch J.; O'Shea V.; Raine C.; Reeves P.; Scarr J.; Smith K.; Teixeira-Dias P.; Thompson A.; Thomson F.; Thorn S.; Turnbull R.; Becker U.; Geweniger C.; Graefe G.; Hanke P.; Hansper G.; Hepp V.; Kluge E.; Putzer A.; Schmidt M.; Sommer J.; Stenzel H.; Tittel K.; Werner S.; Wunsch M.; Abbaneo D.; Beuselinck R.; Binnie D.; Cameron W.; Dornan P.; Moutoussi A.; Nash J.; Sedgbeer J.; Stacey A.; Williams M.; Dissertori G.; Girtler P.; Kuhn D.; Rudolph G.; Betteridge A.; Bowdery C.; Colrain P.; Crawford G.; Finch A.; Foster F.; Hughes G.; Sloan T.; Williams M.; Galla A.; Giehl I.; Greene A.; Hoffmann C.; Jakobs K.; Kleinknecht K.; Quast G.; Renk B.; Rohne E.; Sander H.; Van Gemmeren P.; Zeitnitz C.; Aubert J.; Bencheikh A.; Benchouk C.; Bonissent A.; Bujosa G.; Calvet D.; Carr J.; Diaconu C.; Etienne F.; Konstantinidis N.; Payre P.; Rousseau D.; Talby M.; Sadouki A.; Thulasidas M.; Trabelsi K.; Aleppo M.; Ragusa F.; Bauer C.; Berlich R.; Blum W.; Büscher V.; Dietl H.; Dydak F.; Ganis G.; Gotzhein C.; Kroha H.; Lütjens G.; Lutz G.; Männer W.; Moser H.; Richter R.; Rosado-Schlosser A.; Schael S.; Settles R.; Seywerd H.; St. Denis R.; Stenzel H.; Wiedenmann W.; Wolf G.; Boucrot J.; Callot O.; Choi Y.; Cordier A.; Davier M.; Duflot L.; Grivaz J.; Heusse P.; Höcker A.; Jacholkowska A.; Jacquet M.; Kim D.; Le Diberder F.; Lefrançois J.; Lutz A.; Nikolic I.; Park H.; Schune M.; Simion S.; Veillet J.; Videau I.; Zerwas D.; Azzurri P.; Bagliesi G.; Batignani G.; Bettarini S.; Bozzi C.; Calderini G.; Carpinelli M.; Ciocci M.; Ciulli V.; Dell'Orso R.; Fantechi R.; Ferrante I.; Foà L.; Forti F.; Giassi A.; Giorgi M.; Gregorio A.; Ligabue F.; Lusiani A.; Marrocchesi P.; Messineo A.; Palla F.; Sanguinetti G.; Sciabà A.; Spagnolo P.; Steinberger J.; Tenchini R.; Tonelli G.; Vannini C.; Verdini P.; Walsh J.; Blair G.; Bryant L.; Cerutti F.; Chambers J.; Gao Y.; Green M.; Medcalf T.; Perrodo P.; Strong J.; Von Wimmersperg-Toeller J.; Botterill D.; Clifft R.; Edgecock T.; Haywood S.; Maley P.; Norton P.; Thompson J.; Wright A.; Bloch-Devaux B.; Colas P.; Emery S.; Kozanecki W.; Lançon E.; Lemaire M.; Locci E.; Marx B.; Perez P.; Rander J.; Renardy J.; Roussarie A.; Schuller J.; Schwindling J.; Trabelsi A.; Vallage B.; Black S.; Dann J.; Johnson R.; Kim H.; Litke A.; McNeil M.; Taylor G.; Booth C.; Boswell R.; Brew C.; Cartwright S.; Combley F.; Koksal A.; Letho M.; Newton W.; Reeve J.; Thompson L.; Böhrer A.; Brandt S.; Cowan G.; Grupen C.; Minguet-Rodriquez J.; Rivera F.; Saraiva P.; Smolik L.; Stephan F.; Apollonio M.; Bosisio L.; Della Marina R.; Giannini G.; Gobbo B.; Musolino G.; Rothberg J.; Wasserbaech S.; Armstrong S.; Elmer P.; Feng Z.; Ferguson D.; Gao Y.; González S.; Grahl J.; Greening T.; Hayes O.; Hu H.; McNamara P.; Nachtman J.; Orejudos W.; Pan Y.; Saadi Y.; Scott I.; Walsh A.; Wu S.; Wu X.; Yamartino J.; Zheng M.; Zobernig G.; Zobernig G.; Zheng M.; Yamartino J.; Wu X.; Wu S.; Walsh A.; Scott I.; Saadi Y.; Buskulic D.</p
