Relevant bibliographies by topics / DOC

Academic literature on the topic 'DOC'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 May 2024

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Journal articles on the topic "DOC"

1

Shih, Yu-Ting, Pei-Hao Chen, Li-Chin Lee, Chien-Sen Liao, Shih-Hao Jien, Fuh-Kwo Shiah, Tsung-Yu Lee, et al. "Dynamic responses of DOC and DIC transport to different flow regimes in a subtropical small mountainous river." Hydrology and Earth System Sciences 22, no. 12 (December 21, 2018): 6579–90. http://dx.doi.org/10.5194/hess-22-6579-2018.

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Abstract. Transport of riverine dissolved carbon (including DOC and DIC) is a crucial process linking terrestrial and aquatic C reservoirs, but has rarely been examined in subtropical small mountainous rivers (SMRs). This study monitored DOC and DIC concentrations on a biweekly basis during non-event flow periods and at 3 h intervals during two typhoon events in three SMRs in southwestern Taiwan between January 2014 and August 2016. Two models, HBV (the Hydrologiska Byråns Vattenbalansavdelning model) and a three-endmember mixing model, were applied to determine the quantities of DOC and DIC transport from different flow paths. The results show that the annual DOC and DIC fluxes were 2.7–4.8 and 48.4–54.3 t C km−2 yr−1, respectively, which were approx. 2 and 20 times higher than the global mean of 1.4 and 2.6 t C km−2 yr−1, respectively. The DIC ∕ DOC ratio was 14.08, which is much higher than the mean of large rivers worldwide (1.86), and indicates the high rates of chemical weathering in this region. The two typhoons contributed 12 %–14 % of the annual streamflow in only 3 days (about 1.0 % of the annual time), whereas 15.0 %–23.5 % and 9.2 %–12.6 % of the annual DOC and DIC flux, respectively, suggested that typhoons play a more important role in DOC transport than DIC transport. The endmember mixing model suggested that DOC and DIC export was mainly from surface runoff and deep groundwater, respectively. The unique patterns seen in Taiwan SMRs characterized by high dissolved carbon flux, high DIC ∕ DOC ratio, and large transport by intense storms should be taken into consideration when estimating global carbon budgets.
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2

Cui, Ji-Fa, Shi-Jie Han, Xi-Mei Zhang, Xing-Guo Han, and Zhi-Ping Wang. "Temporal–Spatial Variability of Dissolved Carbon in the Tributary Streams of the Lower Yangtze River Basin." Water 14, no. 24 (December 12, 2022): 4057. http://dx.doi.org/10.3390/w14244057.

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Dissolved carbon has been widely investigated in natural rivers worldwide. However, it has been rarely studied in riverine system of farming regions, where small streams have been usually modified by a water gate and flood levee. This study was conducted to investigate dissolved organic and inorganic carbon (DOC, DIC) in artificially modified tributary streams, namely the Desheng and Shuangqiao-Shiba streams, in a farming region of the lower Yangtze River basin. The results showed that the DOC and DIC concentrations had remarkable temporal–spatial variability in the Desheng and Shuangqiao-Shiba streams. The mean DOC concentrations were 5.4 and 6.7 mg L−1 in the Desheng and Shuangqiao-Shiba streams during the period of about 1 year, while the DIC concentrations were 14.0 and 9.6 mg L−1 in both streams, respectively. The DOC and DIC concentrations mainly showed the linear decreasing trends from source through to export in the spring, summer, autumn, and winter. The DOC concentration was almost always lower than the DIC concentration. The DOC concentration was positively correlated with the DIC concentration in the Desheng stream over the four seasons, indicating that the DOC and DIC potentially had similar sources. The DOC and DIC concentrations increased with sewage discharge, which introduced a potential hazard to human health. The water gate and flood levee in the Desheng and Shuangqiao-Shiba streams were constructed for discharging floods and recharging irrigation in the farming region, and their effects on dissolved carbon require further research.
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3

Song, K. S., S. Y. Zang, Y. Zhao, J. Du, L. Li, N. N. Zhang, X. D. Wang, T. T. Shao, Y. Guan, and L. Liu. "Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semiarid region, China." Hydrology and Earth System Sciences Discussions 10, no. 5 (May 27, 2013): 6559–97. http://dx.doi.org/10.5194/hessd-10-6559-2013.

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Abstract. Spatiotemporal variations of dissolved organic carbon (DOC), inorganic carbon (DIC) in 26 waters across the semi-humid/semi-arid Songnen Plain, China were examined with data collected during 2008–2011. Fresh (n = 14) and brackish (n = 12) waters were grouped according to electrical conductivity (threshold = 1000 μS cm−1). Significant differences in the mean DOC/DIC concentrations were observed between fresh (5.63 mg L−1, 37.39 mg L−1) and brackish waters (15.33 mg L−1, 142.93 mg L−1). Colored dissolved organic matter (CDOM) and DOC concentrations were mainly controlled by climatic-hydrologic conditions. The observation indicated that the outflow conditions in the semi-endorheic region had condensed effects on the dissolved carbon, resulting in close relationships between salinity vs. DOC (R2 = 0.66), and vs. DIC (R2 = 0.94). Independent data set collected in May 2012 also confirmed this finding (DOC: R2 = 0.79), (DIC: R2 = 0.91), highlighting the potential of quantifying DOC/DIC via salinity measurements for waters dispersed in the plain. Indices based on CDOM absorption spectra, e.g. DOC specific CDOM absorption (SUVA254), absorption ratio a250 : a365 (E250:365) and spectral slope ratio (Sr, S275−295/S350−400), were applied to characterize DOM composition and quality. Our results indicate high molecular weight CDOM fractions are more abundant in fresh waters than brackish waters.
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4

Wang, Linhua, Haw Yen, Liding Chen, Xinhui E, and Yafeng Wang. "Characteristics of wet dissolved carbon deposition in a semi-arid catchment at the Loess Plateau, China." Biogeosciences 15, no. 11 (June 6, 2018): 3345–56. http://dx.doi.org/10.5194/bg-15-3345-2018.

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Abstract. Wet dissolved carbon deposition is a critical node of the global carbon cycle, but little is known about dissolved organic and inorganic carbon (DOC and DIC) concentrations and fluxes in the semi-arid areas of the Loess Plateau Region (LPR). In this study, we measured variations in DOC and DIC concentrations in rainfalls at Yangjuangou Ecological Restoration and Soil and Water Observatory. Rainwater samples were collected in 16 rainfall events from July to September and the event-based, monthly concentrations and fluxes of DOC and DIC were quantified. The results showed that the event-based concentrations and fluxes of DOC and DIC were highly variable, ranging from 0.56 to 28.71 mg C L−1 and from 3.47 to 17.49 mg C L−1, respectively. The corresponding event-based fluxes ranged from 0.21–258.36 mg C m−2 and from 4.12 to 42.32 mg C m−2. The monthly concentrations of DOC and DIC were 24.62 and 4.30 (July), 3.58 and 10.52 (August), and 1.01 and 5.89 (September) mg C L−1, respectively. Thus, the monthly deposition fluxes of DOC and DIC were 541.64/94.60, 131.03/385.03, and 44.44/259.16 mg C m−2 for July, August, and September, respectively. In addition, the concentrations of DOC and DIC for the concentrated rainfall season (July–September) in the studied catchment were 7.06 and 7.00 mg C L−1, respectively. The estimated annual wet dissolved carbon depositions were 1.91 and 1.89 g C m−2 yr−1 for DOC and DIC, respectively. The results of this study suggest the variation in concentrations and fluxes of DOC and DIC and explore that these variation may be related to the dissolved carbon source and the rainfall characteristics during the concentrated rainfall season in the semi-arid catchment of the LPR. Furthermore, these results also suggest that dissolved carbon may be an important external input of carbon into terrestrial ecosystems.
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5

Ding, Ling, Tiantian Ge, and Xuchen Wang. "Dissolved organic carbon dynamics in the East China Sea and the northwest Pacific Ocean." Ocean Science 15, no. 5 (September 6, 2019): 1177–90. http://dx.doi.org/10.5194/os-15-1177-2019.

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Abstract. Oceanic dissolved organic carbon (DOC) represents one of the largest carbon reservoirs on Earth, and its distribution and biogeochemical cycles play important roles in carbon cycling and other biogeochemical processes in the ocean. We report the distribution and concentrations of DOC for water samples collected from the shelf-edge and slope regions in the East China Sea (ECS) and the Kuroshio Extension (KE) in the northwestern North Pacific during two cruises in 2014–2015. The DOC concentrations were 45–88 µM in the ECS and 35–65 µM in the KE. In addition to biological processes that are estimated to account for 7 % and 8 %–20 % in shaping the DOC distribution in the ECS and KE regions, respectively, the DOC distribution is largely controlled by hydrodynamic mixing of different water masses. By comparing the DOC results with dissolved inorganic carbon (DIC) and dissolved inorganic radiocarbon (Δ14C-DIC) measured from the same water samples, we further demonstrate that the intrusion of the Kuroshio Current could dilute the DOC concentrations at stations in the outer shelf and slope regions of the ECS. The concentrations of DOC in the KE were significantly lower in surface waters than in the ECS, and a relatively low and stable DOC level (∼40 µM) was found in deep water (below 1500 m) at all stations. Based on the previously reported DIC and Δ14C-DIC values for the stations, the observed spatial variations of DOC in the upper 700 m among the stations in the KE were mainly influenced by mixing of the two water masses carried by the Kuroshio and Oyashio, the two dominant western boundary currents in the region. The hydrodynamic processes are thus important factors in the distribution and dynamics of DOC in the KE region.
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6

Song, K. S., S. Y. Zang, Y. Zhao, L. Li, J. Du, N. N. Zhang, X. D. Wang, T. T. Shao, Y. Guan, and L. Liu. "Spatiotemporal characterization of dissolved carbon for inland waters in semi-humid/semi-arid region, China." Hydrology and Earth System Sciences 17, no. 10 (October 30, 2013): 4269–81. http://dx.doi.org/10.5194/hess-17-4269-2013.

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Abstract. Spatiotemporal variations of dissolved organic carbon (DOC) and inorganic carbon (DIC) in 26 waters across the semi-humid/semi-arid Songnen Plain, China, were examined with data collected during 2008–2011. Fresh (n = 14) and brackish (n = 12) waters were grouped according to electrical conductivity (threshold = 1000 μS cm−1) Significant differences in the average DOC and DIC concentrations were observed between the fresh (5.63 mg L−1, 37.39 mg L−1) and the brackish waters (15.33 mg L−1, 142.93 mg L−1). Colored dissolved organic matter (CDOM) and DOC concentrations were mainly controlled by climatic–hydrologic conditions. The investigation indicated that the outflow conditions in the semi-arid region had condensed effects on the dissolved carbon, resulting in close relationships between salinity vs. DOC (R2 = 0.66), and salinity vs. DIC (R2 = 0.94). An independent data set collected in May 2012 also confirmed this finding (DOC: R2 = 0.79, DIC: R2 = 0.91), highlighting the potential of quantifying DOC and DIC via salinity measurements for waters dispersed in the plain. Indices based on the CDOM absorption spectra (e.g., the DOC-specific CDOM absorption (SUVA254), absorption ratio a250 : a365 (E250 : E365) and the spectral slope ratio (Sr, S275−295/S350−400) were applied to characterize CDOM composition and quality. Our results indicate that high molecular weight CDOM fractions are more abundant in the fresh waters than the brackish waters.
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7

Havas, Robin, Christophe Thomazo, Miguel Iniesto, Didier Jézéquel, David Moreira, Rosaluz Tavera, Jeanne Caumartin, Elodie Muller, Purificación López-García, and Karim Benzerara. "The hidden role of dissolved organic carbon in the biogeochemical cycle of carbon in modern redox-stratified lakes." Biogeosciences 20, no. 12 (June 23, 2023): 2405–24. http://dx.doi.org/10.5194/bg-20-2405-2023.

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Abstract. The dissolved organic carbon (DOC) reservoir plays a critical role in the C cycle of marine and freshwater environments because of its size and implication in many biogeochemical reactions. Although it is poorly constrained, its importance in ancient Earth's C cycles is also commonly invoked. Yet DOC is rarely quantified and characterized in modern stratified analogues. In this study, we investigated the DOC reservoirs of four redox-stratified alkaline crater lakes in Mexico. We analyzed the concentrations and isotopic compositions of DOC throughout the four water columns and compared them with existing data on dissolved inorganic and particulate organic C reservoirs (DIC and POC). The four lakes have high DOC concentrations with great variability between and within the lakes (averaging 2 ± 4 mM; 1 SD, n=28; i.e., from ∼ 15 to 160 times the amount of POC). The δ13CDOC signatures also span a broad range of values from −29.3 ‰ to −8.7 ‰ (with as much as 12.5 ‰ variation within a single lake). The prominent DOC peaks (up to 21 mM), together with their associated isotopic variability, are interpreted as reflecting oxygenic and/or anoxygenic primary productivity through the release of excess fixed carbon in three of the lakes (Alberca de los Espinos, La Preciosa, and Atexcac). By contrast, the variability of [DOC] and δ13CDOC in the case of Lake Alchichica is mainly explained by the partial degradation of organic matter and the accumulation of DOC in anoxic waters. The DOC records detailed metabolic functions such as active DIC-uptake and DIC-concentrating mechanisms, which cannot be inferred from DIC and POC analyses alone but which are critical to the understanding of carbon fluxes from the environment to the biomass. Extrapolating our results to the geological record, we suggest that anaerobic oxidation of DOC may have caused the very negative C isotope excursions in the Neoproterozoic. It is, however, unlikely that a large oceanic DOC reservoir could overweigh the entire oceanic DIC reservoir. This study demonstrates how the analysis of DOC in modern systems deepens our understanding of the C cycle in stratified environments and helps to set boundary conditions for the Earth's past oceans.
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Lindell, Måns J., H. Wilhelm Granéli, and Stefan Bertilsson. "Seasonal photoreactivity of dissolved organic matter from lakes with contrasting humic content." Canadian Journal of Fisheries and Aquatic Sciences 57, no. 5 (May 1, 2000): 875–85. http://dx.doi.org/10.1139/f00-016.

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We studied seasonal variability in photodegradation of dissolved organic carbon (DOC) resulting from artificial ultraviolet-A (UV-A) and UV-B irradiation. Water samples were taken approximately monthly from the surface layers of two oligotrophic lakes with contrasting humic content, situated in southern Sweden. Lake water was filter-sterilized (0.2 μm) and exposed to artificial UV radiation in quartz tubes. Potential DOC photodegradation, measured as a photoproduction of dissolved inorganic carbon (DIC) and oxalic, malonic, formic, and acetic acid in irradiated samples, was observed throughout the sampling period. In addition, exposure to UV radiation resulted in a decrease in DOC, absorbance, and humic substance fluorescence. The photoproduction of DIC and the low molecular weight (LMW) organic acids varied seasonally, being generally higher in winter and spring (December-May), while DOC appeared to become less photoreactive after the extensive exposure to solar radiation during summer. Production rates of both DIC and LMW organic acids were approximately eight times higher in the humic lake despite that the DOC concentration was only two times higher than in the clearwater lake. This is most probably due to the high input of allochthonous DOC and the resulting higher absorbance to DOC ratio in the humic system. Furthermore, the longer hydraulic residence time in the clearwater system could have resulted in an accumulation of residual DOC, recalcitrant to further photodegradation.
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Song, Chunlin, Genxu Wang, Tianxu Mao, Xiaopeng Chen, Kewei Huang, Xiangyang Sun, and Zhaoyong Hu. "Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region." PeerJ 7 (June 17, 2019): e7146. http://dx.doi.org/10.7717/peerj.7146.

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The Qinghai-Tibet Plateau (QTP) is experiencing severe permafrost degradation, which can affect the hydrological and biogeochemical processes. Yet how the permafrost change affects riverine carbon export remains uncertain. Here, we investigated the seasonal variations of dissolved inorganic and organic carbon (DIC and DOC) during flow seasons in a watershed located in the central QTP permafrost region. The results showed that riverine DIC concentrations (27.81 ± 9.75 mg L−1) were much higher than DOC concentrations (6.57 ± 2.24 mg L−1). DIC and DOC fluxes were 3.95 and 0.94 g C m−2 year−1, respectively. DIC concentrations increased from initial thaw (May) to freeze period (October), while DOC concentrations remained relatively steady. Daily dissolved carbon concentrations were more closely correlated with baseflow than that with total runoff. Spatially, average DIC and DOC concentrations were positively correlated with vegetation coverage but negatively correlated with bare land coverage. DIC concentrations increased with the thawed and frozen depths due to increased soil interflow, more thaw-released carbon, more groundwater contribution, and possibly more carbonate weathering by soil CO2 formed carbonic acid. The DIC and DOC fluxes increased with thawed depth and decreased with frozen layer thickness. The seasonality of riverine dissolved carbon export was highly dependent on active layer thawing and freezing processes, which highlights the importance of changing permafrost for riverine carbon export. Future warming in the QTP permafrost region may alter the quantity and mechanisms of riverine carbon export.
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Shah, S. R., S. B. Joye, J. A. Brandes, and A. P. McNichol. "Carbon isotopic evidence for microbial control of carbon supply to Orca Basin at the seawater–brine interface." Biogeosciences 10, no. 5 (May 13, 2013): 3175–83. http://dx.doi.org/10.5194/bg-10-3175-2013.

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Abstract. Orca Basin, an intraslope basin on the Texas-Louisiana continental slope, hosts a hypersaline, anoxic brine in its lowermost 200 m in which limited microbial activity has been reported. This brine contains a large reservoir of reduced and aged carbon, and appears to be stable at decadal time scales: concentrations and isotopic composition of dissolved inorganic (DIC) and organic carbon (DOC) are similar to measurements made in the 1970s. Both DIC and DOC are more "aged" within the brine pool than in overlying water, and the isotopic contrast between brine carbon and seawater carbon is much greater for DIC than DOC. While the stable carbon isotopic composition of brine DIC points towards a combination of methane and organic carbon remineralization as its source, radiocarbon and box model results point to the brine interface as the major source region for DIC, allowing for only limited oxidation of methane diffusing upwards from sediments. This conclusion is consistent with previous studies that identify the seawater–brine interface as the focus of microbial activity associated with Orca Basin brine. Isotopic similarities between DIC and DOC suggest a different relationship between these two carbon reservoirs than is typically observed in deep ocean basins. Radiocarbon values implicate the seawater–brine interface region as the likely source region for DOC to the brine as well as DIC.
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Dissertations / Theses on the topic "DOC"

1

Olson, Ted S. "Doc Watson: Traditional Plus." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/etsu-works/5513.

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Excerpt: Blind from infancy, Arthel “Doc” Watson (1923-2012) was among the most acclaimed American roots musicians active during the second half of the 20th Century, and he remains influential and legendary in the 21st Century. A master of two acoustic guitar styles (flat-picking and finger-style) and highly skilled at playing old-time banjo and harmonica, Watson was also an expressive singer who possessed a resonant baritone voice and an extensive repertoire of traditional and contemporary songs.
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Olson, Ted. "Remembering Arthel Lane 'Doc' Watson." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/1188.

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Miranda, Alquinta Carlos, and Clares Patricio Díaz. "Sumitomo Techni-Cal y Doc Kennedy." Tesis, Universidad de Chile, 2014. http://www.repositorio.uchile.cl/handle/2250/130435.

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Tesis para optar al grado de Magíster en Administración
Autores no autorizan el acceso a texto completo de su documento
Miranda Alquinta, Carlos (Parte I), Díaz Clares, Patricio (Parte II)
Sumitomo Corporation Chile es una empresa perteneciente al grupo Sumitomo Corporation de Japón, empresa líder en trading general con más de 140 oficinas en 65 países del mundo. Tiene como misión “alcanzar la prosperidad y hacer realidad los sueños a través de actividades de negocios éticas y responsables”. Su visión es “aspirar a ser una organización global que vaya en todo momento anticipada a los cambios, que siempre cree nuevos valores y que contribuya ampliamente a la sociedad”. En Chile tiene operaciones comerciales desde el año 1993 en las áreas de Minería, Forestal, Productos Químicos y Alimentos. El siguiente Plan de negocios se enfocará en la División de Alimentos y, dentro de ésta en la Unidad Estratégica de Negocios (UEN) “Alimentos para Mascotas”, la cual tiene el mayor potencial de crecimiento y rentabilidad para la división. El objetivo es competir en el segmento especializado High/Super Premium de alimentos para perros y gatos en Chile - el cual utiliza como canales de distribución preferente las veterinarias, pet shops y criadores- con las marcas Techni-cal y Doc Kennedy, marcas importadas provenientes de orígenes con altas tecnologías de fabricación, experiencia y prestigio en la fabricación de alimentos para mascotas. Se considera que en Chile existen grandes oportunidades de inversión para los productos mencionados, sólo en los últimos 4 años el negocio de los animales domésticos ha tenido un crecimiento del 37%. Además existen clientes cada vez más exigentes, dispuestos a pagar más por la calidad de los alimentos para sus mascotas. Aun cuando Sumitomo comenzó a participar en este mercado y segmento hace algunos años, su participación es muy baja comparado con el crecimiento que ha tenido el mercado en general debido a la ausencia de una estrategia de marketing, su participación total de 3%, con ventas anuales de $350 millones y un margen de utilidad bruta de $80 millones. El siguiente plan está enfocado en la creación de un plan de marketing para la división alimento para mascotas con la finalidad de lograr el tamaño exigido por la compañía, el cual establece que cada negocio en el cual tiene presencia debe generar sobre $250 millones de Utilidad Bruta. Con el desarrollo de este plan, estimamos sobrepasar esa cifra al quinto año.
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Badr, El-Sayed A. "Environmental assessment of biogeochemical cycling of dissolved organic carbon (DOC) and nitrogen (DON) in natural waters." Thesis, University of Plymouth, 2005. http://hdl.handle.net/10026.1/1063.

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Increases in human population and activities have lead to significantly enhanced inputs of carbon and nitrogen fiom both point and difiuse sources to rivers, estuaries, and coastal seas, altering the global carbon and nitrogen biogeochemical cycles. This increased load has had a marked ecological impact globally, with detrimental changes to primary production, conununity stricture and water quality. Understandmg the nature and cycling of dissolved organic carbon (DOC) and nitrogen (DON), significant components of the global carbon and nitrogen cycles, in estuaries will provide better estimates of C and N transport to coastal and ocean waters. This study involves: (1) optimisation of the h i ^ temperature catalytic oxidation (HTCO) analytical method used for reliable analysis of DOC and total, dissolved nitrogen (TDN), (2) investigation of spatial and temporal variations of DOC and DON, and other reliated determinands, in two contrasting estuarine environments, the Yealm and Plym, in south-west England, (3) investigation of DON bioavailability using a bacterial incubation experiment, and (4) preliminary work on the use of stable nitrogen isotope ratios to identify DON sources. The sampling and analytical protocols required for rapid, precise and reliable determinations of DOC and DON, using the coupled HTCO-chemiluminescence technique, are described ui this study. This metiiod gave detection limits of approxunately 6.2 \iM C and 0.46 | iM N , and precisions of < 2-3 % and < 3-5 % (n=3-5) for DOC and TDN, respectively. The mean DOC and TDN of the CRMs analysed, over a period of 2 years, were 48 ± 3.9 | iM C and 20 ± 1.5 nM N that were close to the certified values of 44 - 45 pM C and 21 | iM N , respectively. Concentrations of DOC ranged from 61 | iM C at the seaward end to 335 pM C at the fresh water end for the Yealm, and 71 - 290 |j,M C for the Plym. DON concenfrations were mamly m the range of 1.8 - 62 pM N for the Yeahn, and 4-94 \iM N for the Plym. The enhanced DON concenfrations in the Yealm might be the result of sewage discharges and agricultural run off, while in the Plym they may be due to sewage discharge, run off from the Chelson Meadow landfill and other anthropogenic activities within the urban Plym catchment. Except during a limited numbers of surveys, DOC and DON generally behaved in a non conservative manner in these estuaries. Nifrate and filterable reactive phosphate (FRP) behaved relatively conservatively m the Yealm, but were more non-conservative in the Plym. The spatial distribution of DOC and DON concenfrations in the Plym Estuary appeared much more mfluenced by anthropogenic uiputs relative to distributions in the Yealm Estuary. The seasonal variation of DOC and DON was characterised by lower concenfrations during winter and a slight increase in spring and suimner followed by highest concenfrations during late smmner and auturrm, suggesting a sfrong link to seasonally variable phytoplankton production. The confribution of DON to die TDN pool ranged between 4 and 79 % for the Yealm, and 3.5 - 84 % for the Plym. Higher values (53 - 79 %) were observed during late summer, emphasising the important contributions of DON to TDN- pool. Incubation experiments usmg the Plym Estuary water mdicated that 30 - 58 % of DON was bioavailable for heterofrophic bacterial utilisation; at the same time nitrate concentrations increased by 9 - 35 %, presumably through mineralization of DON. From the studies undertaken in the present work, it may be concluded that the omission of DON in estuarine and coastal water studies will result in underestimation of the total nifrogen load. As a significant part of the DON appeared to be bioavailable, ignoring this fraction will result in an underestimation of eutrophication pressures on coastal and ocean waters.
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Zhang, Zhuoli. "Dissolved organic carbon (DOC) management in peatlands." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/11357/.

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Peatlands are serving as one of the most important terrestrial carbon stores in the United Kingdom and globally. In the UK, the current trend of peatlands turning from carbon sinks to carbon sources is widely observed and reported. As numerous factors may affect the carbon cycle of peatlands, including climate, land management, hydrology and vegetation, dissolved organic carbon (DOC) was commonly used as an indicator of peatland carbon changes. Besides the function as an indicator of carbon turnover in peatland, increasing DOC in the stream water also raises concern in water companies as the removal of DOC from water represents a major cost of water treatment. This thesis investigates the impacts of land management such as drain blocking and revegetation on stream DOC changes. By building a pilot column study, this thesis also assessed the potential of bank filtration serving as DOC treatment in UK. Results of drain blocking shows the management was a significant impact on the DOC changes. However, later investigation of peak flow events indicates such positive impacts from drain blocking were minor in terms of high peak flow events. Since the majority of DOC export occurred during such peak flow events, drain blocking were found not as an efficient management of DOC changes. The field study of revegetation observed minor effects of revegetation on stream DOC. The results of column bank filtration indicate low DOC removal rate under the current stream DOC level in UK. The bank filtration may efficient remove DOC when higher DOC input applied. However, it is not suitable for UK peatland under current DOC export.
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Nielsen, Alexis. "Effect of permafrost thawing on DOC in surface waters." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-89618.

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Alvarez, Vivanco Claudia Stefany, Chávez Giuliana Stefanie León, Quinto María Guadalupe Lopez, Trucios Yuriko Jazmin Lucar, and Córdova Edwin José Suárez. "Aplicativo móvil para reservaciones de citas médicas – MI DOC." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654858.

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La cultura de prevención médica ante posibles enfermedades a la salud es un tema en el que la población peruana todavía no toma conciencia. Muchos peruanos sólo acuden a hospitales o clínicas cuando les duele una parte del cuerpo o sienten que ya deberían de tratarse. Por otro lado, el obtener una cita médica con el especialista suele demorar varios días o incluso meses, en donde el paciente no tiene una solución rápida para calmar ese mal que le aqueja. A raíz de la pandemia actual, la obtención de estas citas se ha dilatado o incluso se han priorizado especialidades médicas por otras, esto ha generado la saturación en el sistema de salud. Se ha encontrado como oportunidad de negocio la creación de un aplicativo móvil denominado “Mi Doc” que cumpla la función de ser un intermediario entre el paciente y consultorios independientes (doctores), con la finalidad de reservar citas médicas en donde el usuario podrá elegir la programación de la cita según su disponibilidad, cercanía y precio.
The culture of medical prevention in the face of possible diseases is a topic that the Peruvian population is not yet aware of. Many Peruvians only go to hospitals or clinics when they are in pain or feel they should be treated. On the other hand, obtaining a medical appointment with a specialist usually takes several days or even months, where the patient does not have a quick solution to calm this disease that afflicts him. Due to the current pandemic, obtaining these appointments has been delayed or even prioritized by other medical specialties, which has generated saturation in the health system. A business opportunity has been found in the creation of a mobile application called "My Doc" that serves as an intermediary between the patient and independent practices (doctors), to book medical appointments where the user can choose the scheduling of the appointment according to availability, proximity and price.
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8

Coussoulet, Jean-Pierre. "Conception et réalisation d'un système relationnel documentaire : Campus-doc." Nice, 1988. http://www.theses.fr/1988NICE4233.

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Les deux prototypes présentés, bâtis à part du système de gestion de bases de données relationnel Campus, intègrent les fonctionnalités suivantes : 1) gestion de thesaurus; 2) recherche de documents sur données analytiques et/ou signalétiques par requêtes booléennes complexes. Les différences entre ces deux systèmes résident dans leur conception : Minid'oc utilise simplement le modèle relationnel, Campus-doc l'enrichit par intégration de nouveaux types d'entrées
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9

Field-Springer, Kimberly R. "Just Walk/Walk with a Doc: Organizing for Health." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1363702932.

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Coussoulet, Jean-Pierre. "Conception et réalisation d'un système relationnel documentaire CAMPUS-DOC /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376128170.

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Books on the topic "DOC"

1

Russell, Mary Doria. Doc. Waterville, Me: Thorndike Press, 2011.

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Pollock, Sharon. Doc. Toronto: Playwrights Canada, 1986.

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Pollock, Sharon. Doc. Toronto: Playwrights Canada, 1986.

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Graber, Richard. Doc. New York: Harper & Row, 1986.

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Doc McStuffins annual: The doc is in. 2nd ed. London: Egmont, 2015.

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Rudofossi, Daniel M. Cop Doc. New York, NY: Routledge, 2016.: Routledge, 2017. http://dx.doi.org/10.4324/9781315266206.

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Minghella, Dominic, and Ben Bolt. Doc Martin. Silver Spring, MD: Acorn Media, 2013.

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Artists, Disney Storybook, ed. Doc McStuffins. Lincolnwood, Ill: Publications International, 2013.

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Berrios, Frank. Doc Hudson. New York: Random House Children's Books, 2006.

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Esinencu, Nicolae. Doc: Microroman. Chișinău: Editura Lumina, 2012.

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Book chapters on the topic "DOC"

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Spackman, Barbara. "Italians DOC?" In Postcolonial Italy, 125–38. New York: Palgrave Macmillan US, 2012. http://dx.doi.org/10.1057/9781137281463_9.

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Minero, C., E. Pelizzetti, and M. R. Preston. "Oceanic DOC Measurements." In Chemical Processes in Marine Environments, 299–320. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04207-6_17.

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Simunich, Bethany, Andrea Gregg, and Penny Ralston-Berg. "Design Doc Library." In High-Impact Design for Online Courses, 209–30. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003442370-12.

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Bucanek, James. "Doc, You Meant Storage." In Learn iOS App Development, 581–616. Berkeley, CA: Apress, 2013. http://dx.doi.org/10.1007/978-1-4302-5063-0_19.

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Bucanek, James. "Doc, You Meant Storage." In Learn iOS 8 App Development, 585–617. Berkeley, CA: Apress, 2014. http://dx.doi.org/10.1007/978-1-4842-0208-1_19.

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Wing, Liz. "Creating a Doc Spec." In Writing and Speaking in the Technology Professions, 45–48. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119134633.ch9.

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Kohlhase, Michael. "Document Infrastructure (Module DOC)." In OMDoc – An Open Markup Format for Mathematical Documents [version 1.2], 89–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11826095_14.

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Amer, Ramses, and Li Jianwei. "From DOC to COC." In Routledge Handbook of the South China Sea, 357–75. Milton Park, Abingdon, Oxon; New York, NY: Routledge, 2021.: Routledge, 2021. http://dx.doi.org/10.4324/9780367822217-25.

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Coetzer, Rudi. "It's getting worse, Doc." In Mistakes in Clinical Neuropsychology, 101–8. London: Routledge, 2023. http://dx.doi.org/10.4324/9781003300748-12.

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Sendler, Ulrich. "Status Quo." In Hot Doc, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78175-9_1.

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Conference papers on the topic "DOC"

1

Ben Salah, Kais, and Khaled Ghedira. "DOC." In the 8th international conference. New York, New York, USA: ACM Press, 2008. http://dx.doi.org/10.1145/1416729.1416767.

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Sheehan, Shane, Saturnino Luz, Pierre Albert, and Masood Masoodian. "TeMoCo-Doc." In AVI '20: International Conference on Advanced Visual Interfaces. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3399715.3399956.

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Si Jung Kim and Bruce H. Thomas. "Doc consortium." In 2012 IEEE International Symposium on Mixed and Augmented Reality - Arts, Media, and Humanities (ISMAR-AMH). IEEE, 2012. http://dx.doi.org/10.1109/ismar-amh.2012.6483967.

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Smolin, Jill, Scott Clark, Jennifer Emberly, Stephen A. Fossati, Doug Sweetland, and Barry Weiss. "What's up doc?" In ACM SIGGRAPH 2002 conference abstracts and applications. New York, New York, USA: ACM Press, 2002. http://dx.doi.org/10.1145/1242073.1242298.

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Castro, Francisco Enrique Vicente, Kathryn Cunningham, Miranda Parker, and Nicholas Lytle. "What's Up, Doc?" In SIGCSE 2022: The 53rd ACM Technical Symposium on Computer Science Education. New York, NY, USA: ACM, 2022. http://dx.doi.org/10.1145/3478432.3499173.

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VAN BODEGRAVEN, GEORGE. "Commercial aircraft DOC methods." In Aircraft Design, Systems and Operations Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-3224.

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Khan, Iqbal Uddin, Haya Ali Kazmi, Faizan Hussain, Muhammad Adeel Mannan, and Afzal Hussain. "Pharma Doc. Information System." In 2020 International Conference on Information Science and Communication Technology (ICISCT). IEEE, 2020. http://dx.doi.org/10.1109/icisct49550.2020.9080037.

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Zachry, M. "Session details: Modeling DOC." In SIGDOC07: The 25th ACM International Conference on Design of Communication. New York, NY, USA: ACM, 2007. http://dx.doi.org/10.1145/3255433.

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Frank, Erica. "HEALTHY DOC=HEALTHY PATIENT." In 12th annual International Conference of Education, Research and Innovation. IATED, 2019. http://dx.doi.org/10.21125/iceri.2019.2940.

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Qu, Jingwei, Zhixuan Jing, Xiangbin Li, Yang Yu, Hongxiang Lin, Xiaoqing Lyu, and Zhi Tang. "Doc-to-Doc Recommender for Medical Literature with Similarity of Molecule Graphs." In 2021 IEEE International Conference on Bioinformatics and Biomedicine (BIBM). IEEE, 2021. http://dx.doi.org/10.1109/bibm52615.2021.9735184.

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Reports on the topic "DOC"

1

Golden, Susan S. DOE final report 100608.doc. Office of Scientific and Technical Information (OSTI), October 2008. http://dx.doi.org/10.2172/939482.

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Martin, Chris A., and Kaylee R. Colter. George "Doc" Cavalliere Park. Landscape Architecture Foundation, 2014. http://dx.doi.org/10.31353/cs0730.

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Goldoni, Riccardo. ResearchHub Reputation Hackathon Resources Doc. ResearchHub Technologies, Inc., January 2023. http://dx.doi.org/10.55277/researchhub.ex8am0zt.

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Wilson, Cathy Jean. Sean Michaletz Directors Post Doc Fellow Report. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1406240.

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McDermott, J., R. Gelinas, and S. Ornstein. Doc, Wyatt, and Virgil: Prototyping Storage Jamming Defenses. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada465303.

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Knittel, Kenn M. Requirements Doc for Refurb of JASPER Facility in B131HB. Office of Scientific and Technical Information (OSTI), January 2017. http://dx.doi.org/10.2172/1343016.

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Sakurai, Hiroo, Yasuyuki Banno, and Makoto Nagata. Study of Soot Regeneration Uniformity on DOC+CSF System. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0315.

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Royer, David. Final Report - Cycling of DOC and DON by novel heterotrophic and photoheterotrophic bacteria in the ocean. Office of Scientific and Technical Information (OSTI), June 2011. http://dx.doi.org/10.2172/1015973.

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Kirchman, David L. Cycling of DOC and DON by Novel Heterotrophic and Photoheterotrophic Bacteria in the Ocean: Final Report. Office of Scientific and Technical Information (OSTI), December 2008. http://dx.doi.org/10.2172/943554.

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Meagher, Richard B. The engineered phytoremediation of ionic and methylmercury pollution 70054yr.2000.doc. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/833502.

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