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Dissertations / Theses on the topic 'Retention Time'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Gauffin, Oskar. "Prediction of retention time." Thesis, Uppsala universitet, Tillämpad matematik och statistik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-253933.

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2

Thewalim, Yasar. "Retention time predictions in Gas Chromatography." Doctoral thesis, Stockholm University, Department of Analytical Chemistry, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-55088.

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In gas chromatography, analytes are separated by differences in their partition between a mobile phase and a stationary phase. Temperature-program, column dimensions, stationary and mobile phases, and flow rate are all parameters that can affect the quality of the separation in gas chromatography. To achieve a good separation (in a short amount of time) it is necessary to optimize these parameters. This can often be quite a tedious task. Using computer simulations, it is possible to both gain a better understanding of how the different parameters govern retention and separation of a given set

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3

Kumar, Neraj. "Detection of Variable Retention Time in DRAM." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/2103.

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This thesis investigates a test method to detect the presence of Variable Retention Time (VRT) bits in manufactured DRAM. The VRT bits retention time is modeled as a 2-state random telegraph process that includes miscorrelation between test and use. The VRT defect is particularly sensitive to test and use conditions. A new test method is proposed to screen the VRT bits by simulating the use conditions during manufacturing test. Evaluation of the proposed test method required a bit-level VRT model to be parameterized as a function of temperature and voltage conditions. The complete 2-state VRT

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4

Väljamets, Sara. "Peptide Retention Time Prediction using Artificial Neural Networks." Thesis, KTH, Matematisk statistik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-190995.

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This thesis describes the development and evaluation of an artificial neural network, trained to predict the chromatographic retention times of peptides, based on their amino acid sequence. The purpose of accurately predicting retention times is to increase the number of protein identifications in shotgun proteomics and to improve targeted mass spectrometry experiment. The model presented in this thesis is a branched convolutional neural network (CNN) consisting of two convolutional layers, followed by three fully connected layers, all with leaky rectifier as the activation function. Each amin

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5

Bluml, Joel. "On-Campus Employment and Retention of First-Time, Full-Time College Students." ScholarWorks, 2019. https://scholarworks.waldenu.edu/dissertations/6973.

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Retention of 1st-year students is a challenge facing higher education and remains relevant for all stakeholders. Low persistence negatively affects individual students, institutions, and society as a whole. Nationally, a significant number of students have reported working while in college, particularly 1st-generation, low socioeconomic status (SES), and racial and ethnic minority students, those same groups who are at higher risk of experiencing low retention rates. Guided by Tinto's interactionalist model of student departure, binary logistic regression analyses of archival data were used in

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6

Reynolds-Adkins, Martha E. "Relationship Between Student Retention and Client Presenting Concern." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1210796057.

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7

Qiu, Xuanbin. "Prediction of peptide retention time based on Gaussain Processes." Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175982.

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Shotgun Proteomics is the leading technique for protein identification in complexmixtures. However, it produces a large amount of data which results in aextremely high computational cost for identifying the protein. Retention time(RT) is an important factor to be used to enhance the efficiency of protein identification.By predicting the retention time successfully, we could decrease thecomputational cost dramatically. This thesis uses a machine learning method,Gaussian Processes, to predict the retention time of a set of peptide in hand.We also implement a feature extraction method called Bag-

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8

Goddard, Christopher Morris. "Myocardial leukocyte transit time and retention during acute endotoxemia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0002/NQ27148.pdf.

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9

Pinson, Catherine Gaffney. "Academic Speed Bumps: Time to Completion of the Dissertation." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30359.

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The purpose of this study was to determine factors impeding rapid completion of the dissertation. The population studied was 1990-95 graduates of the Department of Leadership and Policy Studies (formerly the Division of Administrative and Educational Services) of the College of Education at Virginia Tech. Two hundred ninety-four surveys were mailed. The total of potential eligible responses was 263. The total of returned, usable surveys was 192, for a return rate of 73 percent. There was one primary research question, with four sub-questions: Are there any student characteristics that ca

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10

Hempel, Kevin R. Parshall Ione I. "Time factors affecting the retention decision of Navy enlisted members." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27311.

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11

Snow, Nicholas Harrer. "Numerical extrapolations for retention time prediction in capillary gas chromatography." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-170350/.

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12

Crosby, Mark. "School retention and part-time work : an attempt to isolate the effect of an explanator of school retention /." Title page, contents and introduction only, 1985. http://web4.library.adelaide.edu.au/theses/09EC/09ecc949.pdf.

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13

Oddsson, Finnur. "Computerized training methods effects on retention and rate of responding /." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1520.

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Thesis (Ph. D.)--West Virginia University, 2000.<br>Title from document title page. Document formatted into pages; contains x, 103 p. : ill. Includes abstract. Includes bibliographical references (p. 60-65).

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14

Munasinghe, Ranjani. "Effect of hydraulic retention time on landfill leachate and gas characteristics." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq25123.pdf.

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15

Kim, Min-Jin. "The effect of sludge retention time on dewaterability of activated sludge." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58745.pdf.

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16

Stringer, Bobbi Rhe. "Nonverbal Immediacy as a Predictor of Student Retention Rates Among Full-time/part-time Community College Faculty." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc278524/.

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17

Kruczek, Daniel. "Prediction of Ranking of Chromatographic Retention Times using a Convolutional Network." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224794.

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In shotgun proteomics, the liquid chromatography step is used to separate peptides in order to analyze as few as possible at the same time in the mass spectrometry step. Each peptide has a retention time, that is how long it takes to pass through the chromatography column. Prediction of the retention time can be used to gain increased identification of peptides or in order to create targeted proteomics experiments. Using machine learning methods such as support vector machines has given a high prediction accuracy, but such methods require known features that the retention time depends on. In t

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18

Russell, Benjamin (Benjamin David). "Retention time and solvent concentration prediction for an automated peptide manufacturing platform." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/132759.

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Thesis: M. Eng. in Manufacturing, Massachusetts Institute of Technology, Department of Mechanical Engineering, September, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 70-71).<br>This thesis investigates statistical and machine learning techniques for the regression-based prediction of peptide retention time and solvent concentration using amino acid physio-chemical properties and historical test data from liquid chromatography and mass spectroscopy (LC-MS) testing. This research was performed alongside the team at Mytide Therapeutics, in Bost

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19

Phillips, Gary Pelham. "Effect of Solids Retention Time on Activated Sludge Properties and Effluent Quality." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/46517.

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The effect of solids retention time (SRT) or sludge age on activated sludge properties and effluent quality was investigated using laboratory scale reactors. It was found that an increase in SRT resulted in an increase in effluent solution polysaccharide, with the < 3,000 daltons (3K) size fraction contributing up to 68 percent of solution polysaccharides. The feed consisted of low molecular weight, readily degradable protein, suggesting that the observed increases in protein and polysaccharide were due to increased release of exocellular microbial product (EMP). The increase in solution prote

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20

Easwaran, Sathya Poornima. "Developing a Mechanistic Understanding and Optimization of the Cannibal Process: Phase II." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/35108.

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The Cannibal system, comprised of an activated sludge process integrated with a side stream anaerobic bioreactor, is capable of reducing excess sludge up to 60% compared to the conventional activated sludge process. The hydraulic retention time (HRT) in the Cannibal bioreactor and the interchange rate (the percent of sludge by mass interchanged between the activated sludge system and the bioreactor on daily basis) are the two important operational parameters in the optimization of the Cannibal process. This research was designed to investigate the effect of the Cannibal bioreactor hydraulic re

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21

Thompson, Lisa C. "The influence of hydraulic retention time on planktonic biomass in lakes and reservoirs /." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56754.

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Hydraulic retention time (HRT) might contribute to the substantial variation in phosphorus-chlorphyll and chlorophyll-zooplankton models because rapid flushing might depress plankton development. However, for a world-wide data set. HRT was not correlated with chlorophyll. Total phosphorus had no effect on chlorphyll when hypereutrophic sites were considered separately, but chlorophyll was negatively related to HRT. Short term HRT, averaged over periods up to one month, was not correlated with chlorophyll, or zooplankton biomass, in seven impoundments on the St. Lawrence and Ottawa Rivers. The

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22

Taylor, Kelli M. "The effects of overlearning on long-term retention." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000321.

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23

Beck, Whitney Marie. "Describing time spent using various teaching techniques and student immediate, short-term, and long-term cognitive retention." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1243523704.

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24

Hyland, Cheryl. "A Comparative Study of Instructor Status on Student Success and Retention at Motlow State Community College." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3008.

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Data from the National Center for Education Statistics projects total enrollment in post secondary degree-granting institutions to increase 15% from 2010 to 2021 (U.S. Department of Education, 2012). National and state education efforts such as President Obama’s American Graduation Initiative, Tennessee’s Drive to 55, and Tennessee Promise encourage Americans to expand their educational pursuits in order to increase the number of individuals completing a post secondary degree. As states adopt funding formula measures tied directly to student success and retention, higher education institutions

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25

Thomas, Kate. "Dimensions of belonging : rethinking retention for mature part-time undergraduates in English higher education." Thesis, Birkbeck (University of London), 2016. http://bbktheses.da.ulcc.ac.uk/192/.

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This thesis critiques and re-imagines a dominant narrative of contemporary English higher education: that belonging is critical to student retention and success (Thomas 2012). It does so through a qualitative multiple case study of four English higher education institutions, and in relation to mature part-time undergraduates, peripherally positioned in the sector. Institution-centric definitions and measurements of retention are incompatible with the complex lives of a diverse part-time student cohort, as are uniform concepts of belonging which rely on a common understanding of what belonging

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26

Cracolici, Benedict. "Effect of Shear Rate and Mixing Time on Starch/Polyacrylamide Gels as Retention Aids." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/CracoliciB2004.pdf.

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27

Kinyua, Maureen Njoki. "Effect of Solids Retention Time on the Denitrification Potential of Anaerobically Digested Swine Waste." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4520.

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Three continuously stirred tank reactors (CSTR) were operated in semi continuous mode treating swine waste using anaerobic digestion. The reactors were used to test the effect of solid retention time (SRT) on CH4 yield, total ammonia nitrogen (TAN) concentrations, % volatile solids (VS), chemical oxygen demand (COD) and volatile fatty acids (VFA) removal, readily biodegradable COD concentration and the denitrification potential for the effluent in a biological nutrient removal (BNR) system. During Phase I of the study, the three reactors were operated at the same 28 day SRT for 16 weeks. SRTs

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28

Newman, Jackie F. "A First-Year Experience Course and its Relationship to Retention and Academic Success at a Public Community College." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3157.

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The purpose of this quantitative comparative study was to determine the relationship between retention and academic success of students who participated in a First-Year Experience (FYE) course and students who did not participate in a FYE course within a southeastern community college in the United States. The impact of the relationship was to inform an understanding of how a FYE course influences student success. Archival data were collected from the southeastern community college’s student information system, Banner, Data for first-time full time students were gathered, including whether or

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29

Taylor, Bonnie. "Retention Rates and Pre-Matriculation Variables of First-Time, Full-Time Students at Three, Small, Private, Liberal Arts Universities in Georgia." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3923.

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The purpose of this non-experimental, correlational, quantitative study was to provide an in-depth understanding of the relationship between pre-matriculation variables on retention of first-year, full-time students from fall-to-fall semesters at three small, private, liberal arts institutions in the Southeast United States. The findings will help to determine the significance of the relationships between retention and pre-matriculation variables on first-year, full-time students who entered each institutions the fall 2017 and fall 2018 semesters. Archival data at the participating institution

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30

Polo, Christy Beatriz Carolina. "Effect of hydraulic retention time and attachment media on sulfide production by sulfate reducing bacteria." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62266.pdf.

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31

Clark, Brett. "A Study Of The Effects On Retention Of Different Time Intervals Between Opportunities To Learn." Thesis, University of Canterbury. Educational Studies and Leadership, 2014. http://hdl.handle.net/10092/9472.

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In the early 1990s Graham Nuthall and Adrianne Alton-Lee developed a model of the learning and remembering process which has profound implications for teaching and learning at all levels. Using their model they were able to predict what selected primary school students would and would not learn and remember from the teaching of a series of Science and Social Studies units and to do so with an accuracy of between 80 to 85 per cent. The Nuthall model states that for a student to learn and remember a new fact or concept he or she needs three to four learning opportunities with the complete set of

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32

MACOMBER, JEFF RAYMOND. "EFFECTS OF SOLIDS RETENTION TIME ON THE TREATMENT OF SYNTHETIC WASTEWATER USING A MEMBRANE BIOREACTOR." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin981401531.

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33

Marshall, Lynda. "Impact of Online Orientation for First-Time Online Students on Retention, Academic Success, and Persistence." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/4388.

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A challenge faced by higher education is whether online orientation that is offered before the start of class can impact academic performance for online students. The purpose of this quantitative research study was to determine if there are significant differences in retention, academic success, and persistence between first time online students who have participated in an online orientation and those who did not participate and if there was a significant difference in retention, academic success, and persistence by gender of first-time online students. The sample for this study was extracted

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34

Gupta, Ashok Kumar. "The effects of temperature, pH and retention time on volatile fatty acids production from primary sludge." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26292.

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A typical biological phosphorus removal process consists of alternate anaerobic and aerobic zones. Recent research at the University of British Columbia (UBC) has indicated that the addition of volatile fatty acids (VFA's) to the anaerobic zone of Bio-P processes improves the overall phosphorus removal efficiency, at least when treating weak sewage. At the full-scale biological phosphorus removal plant at Kelowna, B.C., and at a pilot-scale facility at UBC, anaerobic fermentation of primary sludge has been used to produce VFA's to add to the anaerobic zone of these processes. The primary obje

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35

Brown, Patrick Anderson. "Influence of anaerobic and anoxic hydraulic retention time on biological nutrient removal in a membrane bioreactor." [Ames, Iowa : Iowa State University], 2007.

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36

Canada, Angela F. (Angela Faye). "The Effect of Time on Training Retention Rates of United States Air Force Loadmaster Apprentice Students." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc278257/.

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The purpose of this study was to determine if extended periods of time out of the training environment has an effect on the retention of training. The rationale for conducting this study was based on the fact that little research has been done in this area. The findings of the study indicated that extensive periods of time out of training do significantly influence the amount of training retained fromone loadmaster course to the other. Additionally, there was a significant relationship between the number of days out of training and the posttest scores. The optimum training break between cours

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37

Gonzales, Joseph L. (Joseph Louis). "A Study of Retention and Attrition Among First Time College Freshmen at North Texas State University." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc331864/.

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This study was designed to examine freshman students at North Texas State University and to determine some of the factors contributing to attrition and retention. The instrument used in the study was the Student Information Questionnaire (SIQ). The instrument was created to aid the objective assessment knowledge relating to student retention and attrition. The categories of knowledge selected included demographics, individual attributes, family background, and educational experience.

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38

Hughes, Kevin Lewis William. "Optimisation of methane production from anaerobically digested cow slurry using mixing regime and hydraulic retention time." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18869.

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AD is regarded as a sustainable technology that could assist the UK Government meet internationally agreed GHG emission targets by 2050. However, the mature status of the technology is based on expensive systems that rely on high energy feedstock to be profitable. Meanwhile, the natural biodegradation of cow slurry is a recognised contributor to climate change despite having a relatively low CH4 potential because of the large volumes produced. Economic mixing is essential to the cost-effectiveness of farm AD but techniques applied are not always appropriate as slurry is a shear thinning thixot

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39

Niedfeldt, Kathryn. "A study of the impact of time lapse on language retention in beginning level Spanish classes." Online version, 2001. http://www.uwstout.edu/lib/thesis/2001/2001niedfeldtk.pdf.

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40

Brown-Minis, Elizabeth N. "The effect of participation in a community college mentoring program on the retention rate and academic performance of first-time, full-time students /." free to MU campus, to others for purchase, 1999. http://wwwlib.umi.com/cr/mo/fullcit?p9953847.

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41

Kemer, Ann Marie. "Is the Postpartum Period a Teachable Time for Improving Diet Quality?" University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1242934101.

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42

Kotarsky, Christopher Joseph. "Strategies for the Reduction of Adipose Tissue and Retention of Muscle Mass in Overweight Individuals." Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/32044.

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Purpose: The purpose of this study was to determine whether time-restricted feeding (TRF) was an effective dietary strategy for reducing fat mass and preserving fat-free mass while evaluating potential changes in cardiometabolic biomarkers, hormones, muscle performance, and energy and macronutrient intake after eight weeks of aerobic exercise and resistance training in overweight and obese adults. Methods: This study was a randomized, controlled trial. Sedentary, overweight and obese adults (mean ± SD; age: 44.48 ± 7.28 years; BMI: 29.61 ± 2.62 kg/m2; females: 85.71%; males: 14.29%) were rando

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43

Hinz, Derik Michael. "The Effects of Part-Time Faculty on First Semester Freshmen Retention: A Predictive Model Using Logistic Regression." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-05192005-001811/.

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This study used data from five years of first-semester entering freshmen cohorts (1999-2003) from North Carolina State University to assess the effects of exposure to part-time faculty upon student retention. A logistic regression model containing high school gpa, total first year hours attempted, gender, SAT verbal score, SAT math score, and percent faculty exposure was found to be a significant (p<.0001) predictor of second year retention. While the percentage to which first-year students were exposed to part-time faculty instruction was significant (p<0.0253) in predicting retention, it had

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Salim, Esam A. "The effect of tracers' physical properties on retention time measurements inside the conditioner of a pellet mill." Thesis, Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/878.

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Walston, Stefan Eugene. "Does Increasing Solids Retention Time During the Wastewater Treatment Process Affect the Persistence of Antibiotic Resistance Genes?" Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/301697.

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Antibiotic resistance (AR) is reducing options for effective treatment of bacterial infections for clinically ill patients throughout the world. Our investigation examined the impact solids retention time (SRT) may have on the degradation of antibiotic compounds, proliferation of AR bacteria, and the persistence of antibiotic resistance genes (ARGs) during the wastewater treatment process. Results indicate the presence of ARGs related to clinically relevant antibiotics. Data analysis showed that antibiotic classes exhibit different removal efficiencies in the biological treatment processes (i.

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Lo, Yi-Fang [Verfasser], and Jan [Akademischer Betreuer] Kühnisch. "Influence of the acid etching time on retention of fissure sealants / Yi-Fang Lo ; Betreuer: Jan Kühnisch." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2020. http://d-nb.info/1222909030/34.

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Dong, Yu. "Application of integrated constructed wetlands for contaminant treatment and diffusion." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7750.

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The sediment accumulation is an important characteristic in the ageing process of integrated constructed wetlands (ICW). Retained nutrient and other contaminants in wetland sediments have the potential to be remobilized and released to the overlying water column when environmental conditions change. In this study, mesocosms which filled with saturated sediments and planted with Phragmites australis and Agrostis stolonifera were set up to examine nutrient and other contaminants retention and/or release by wetland sediment and substrates. The effects of physico-chemical parameters on sediment-wa

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48

Cheng, Hua. "Hydrodynamic control of retention in heterogeneous aquifers and fractured rock." Doctoral thesis, Stockholm : KTH Architecture and the Built Environment, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-496.

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Graybeal, Susan E. French. "A Study of First-Time Full-Time Freshmen's Attributes and Their Associations with Fall-to-Fall Retention Rates at a Two-Year Public Community College." Digital Commons @ East Tennessee State University, 2007. https://dc.etsu.edu/etd/2038.

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The purpose of the study was to investigate the associations between first-time full-time freshmen's attributes and fall-to-fall retention at Northeast State Technical Community College. The 15 attributes included age, first-generation student status, gender, high school classification, race, the student's application date to the institution relative to the start of the semester, the 4 ACT test sub-scores, remedial/developmental course placement, major program of study, financial aid status, first-semester grade point average, and end-of-first-semester credit hour enrollment status. In additio

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Hetrick, Todd M. "Development and Validation of a Modified Clean Agent Draining Model for Total Flooding Fire Suppression Systems." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-theses/121.

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This project analyzes the validity of theoretical models used to predict the duration (hold time) for which a halon-replacement suppression agent will remain within a protected enclosure. Two current models and one new formulation are investigated; the sharp descending interface model (as applied in NFPA 2001, Annex C), the wide descending interface model (implemented in ISO 14520.1, Annex E), and the thick descending interface model (introduced herein). The thick interface model develops the characteristic thickness as an additional input parameter. Experimental data from 34 full-scale tes

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