8_Solid_Phase_Extraction_Issues_2 (1).ppt
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This document discusses issues with solid phase extraction (SPE) as a sample preconcentration method. SPE provides lower detection limits than large sample volumes but can show artifacts from incomplete recovery. The Regional Monitoring Program uses SPE to process 100L water samples through glass fiber filters and XAD2 resin columns. Comparisons of 100L SPE samples to 4L solvent extraction samples show the SPE method may underestimate for high organic samples due to short contact times, while overestimating for low organic samples where solvent extraction recovers more. Alternatives like switching to solvent extraction are not preferable due to increased sampling and shipping volumes required. The status quo 100L SPE method is preferred if its tendencies toward over or under-estimation are taken into account.
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The document discusses proposed improvements to the circulating water treatment system at NLC TPS II power plant. It analyzes water parameters from the current system and identifies high hardness, alkalinity, dissolved solids and oxygen that promote corrosion and scaling. A new treatment system is proposed using increased chlorine dosing to control microbes, along with corrosion and scale inhibitors. Annual chemical consumption and costs are estimated for different cycles of concentration to reduce specific water consumption below 3.5 m3/MWh. Improving the treatment process aims to control corrosion, scaling and fouling in the circulating water system.
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This document provides an introduction to physical-chemical water treatment. It discusses the instructor, Hans van Leeuwen, and his background and research interests in wastewater treatment and bioengineering. It then covers various topics related to water treatment including ozone applications, exotic species in ports, human technological development, pollution, waterborne diseases, dissolved oxygen, biochemical oxygen demand, oxygen depletion in streams, and uses the Streeter-Phelps model to analyze an example of oxygen sag in a river.
Mattias von Brömsse - Targetting safe aquifers
This document summarizes research on targeting arsenic-safe aquifers in Bangladesh and India. The research objectives were to validate the correlation between aquifer sediment colors and groundwater chemistry, characterize geochemistry controlling arsenic mobility, and assess risks of cross-contamination. Geochemical investigations found that arsenic concentrations correlated with sediment colors and were influenced by phosphate as a competing ion for sorption sites. Groundwater modeling indicated two flow systems and calculated groundwater ages. The conclusions were that targeting aquifers by sediment color was a viable mitigation strategy, phosphate impacts arsenic mobilization, and the risk of cross-contamination depends on groundwater abstraction for irrigation.
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Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
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Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
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Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
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dtubbenhauer@gmail.com
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5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
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如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
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◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
Micronuclei test.M.sc.zoology.fisheries.
Current Ms word generated power point presentation covers major details about the micronuclei test. It's significance and assays to conduct it. It is used to detect the micronuclei formation inside the cells of nearly every multicellular organism. It's formation takes place during chromosomal sepration at metaphase.
3D Hybrid PIC simulation of the plasma expansion (ISSS-14)
3D Particle-In-Cell (PIC) algorithm,
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Phenomics assisted breeding in crop improvement
As the population is increasing and will reach about 9 billion upto 2050. Also due to climate change, it is difficult to meet the food requirement of such a large population. Facing the challenges presented by resource shortages, climate
change, and increasing global population, crop yield and quality need to be improved in a sustainable way over the coming decades. Genetic improvement by breeding is the best way to increase crop productivity. With the rapid progression of functional
genomics, an increasing number of crop genomes have been sequenced and dozens of genes influencing key agronomic traits have been identified. However, current genome sequence information has not been adequately exploited for understanding
the complex characteristics of multiple gene, owing to a lack of crop phenotypic data. Efficient, automatic, and accurate technologies and platforms that can capture phenotypic data that can
be linked to genomics information for crop improvement at all growth stages have become as important as genotyping. Thus,
high-throughput phenotyping has become the major bottleneck restricting crop breeding. Plant phenomics has been defined as the high-throughput, accurate acquisition and analysis of multi-dimensional phenotypes
during crop growing stages at the organism level, including the cell, tissue, organ, individual plant, plot, and field levels. With the rapid development of novel sensors, imaging technology,
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8_Solid_Phase_Extraction_Issues_2 (1).ppt
- 1. Solid Phase Extraction Issues TRC September 2007
- 2. Solid Phase Extraction (SPE) Provides a means for preconcentrating water phase organics to allow lower detection limits without logistically intimidating sample sizes (~20L equivalent per analyte type- PCBs, PAHs, etc) May show some artifacts of incomplete recovery, depending on a number of factors, e.g. DOC, sample size, collection speed
- 3. RMP Collection Methodology 100L sample, pumped at 1.5L/min by Infiltrex 300 through wound glass filter (nominal 1um pore) and columns (2x70g) of XAD2 resin. Most recent cruise increased volume pumped through filter to increase PBDE signal relative to blanks (no change in pumping speed)
- 4. Infiltrex vs Whole Water 4L whole water sample vs 100L Infiltrex particulate (filter) + dissolved (XAD2) 2003 PCB 100L vs 4L y = 1.5875x + 0.046 R2 = 0.9916 0 2 4 6 8 10 12 0 2 4 6 8 10 12 100 L results (pg/L) 4 L results (pg/L) BG30
- 5. 2004 2004 PCB 100L vs 4L y = 1.1164x - 0.615 R2 = 0.9309 y = 0.5856x + 0.432 R2 = 0.9754 0 10 20 30 40 50 60 70 0 10 20 30 40 50 60 70 100L results (pg/L) 4L results (pg/L) SB026W SPB010W
- 6. 2005 2005 PCB 100L vs 4L y = 1.2096x + 0.0227 R 2 = 0.9891 y = 0.7442x + 0.1428 R2 = 0.9925 0 5 10 15 20 25 30 35 40 45 50 0 10 20 30 40 50 100 L results (pg/L) 4 L results (pg/L) SB036W CB015W
- 7. Bias Trend? site year max PCB (100L) slope SS DOC BG30 2003 6 1.59 23.5 1606 CB015 2005 10 1.21 3.8 1014 SPB010 2004 22 1.12 34.5 1650 SB036 2005 40 0.74 9.0 2463 SB026 2004 65 0.59 18.0 1870
- 8. Bias Trend? Does not track TSS (SSC) 4L (liquid-liquid) solvent extraction recovery high for low organics (=totPCBs) – 100L short contact time = lower recovery? 100L solid phase extraction high(er) for high organics samples – 4L solvent volume = limited equilibrium?
- 9. Alternatives Switch to liquid-liquid extraction – Likely accurate for low organics – Underestimate for high concentrations – PCB/PBDE, PAH, OCP, OPP, backup = 4L x 5 bottles/site x 22 sites = 110 bottles, 440L to ship Status quo 100L SPE- (preferred?) – Maintain awareness of tendencies – Considered minimum concentrations – More accurate for high concentration samples