Articles de revues : « Trace level »

1

Yap, Diana. « Unit-level track and trace considered by Congress ». Pharmacy Today 19, n^o 6 (juin 2013) : 62. http://dx.doi.org/10.1016/s1042-0991(15)31311-6.

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LANGEVINE, LUDOVIC, et MIREILLE DUCASSÉ. « Design and implementation of a tracer driver : Easy and efficient dynamic analyses of constraint logic programs ». Theory and Practice of Logic Programming 8, n^o 5-6 (novembre 2008) : 581–609. http://dx.doi.org/10.1017/s147106840800344x.

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AbstractTracers provide users with useful information about program executions. In this article, we propose a “tracer driver”. From a single tracer, it provides a powerful front-end enabling multiple dynamic analysis tools to be easily implemented, while limiting the overhead of the trace generation. The relevant execution events are specified by flexible event patterns and a large variety of trace data can be given either systematically or “on demand”. The proposed tracer driver has been designed in the context of constraint logic programming (CLP); experiments have been made within GNU-Prolog. Execution views provided by existing tools have been easily emulated with a negligible overhead. Experimental measures show that the flexibility and power of the described architecture lead to good performance. The tracer driver overhead is inversely proportional to the average time between two traced events. Whereas the principles of the tracer driver are independent of the traced programming language, it is best suited for high-level languages, such as CLP, where each traced execution event encompasses numerous low-level execution steps. Furthermore, CLP is especially hard to debug. The current environments do not provide all the useful dynamic analysis tools. They can significantly benefit from our tracer driver which enables dynamic analyses to be integrated at a very low cost.

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Pacheco-Londoño, Leonardo C., José L. Ruiz-Caballero, Michael L. Ramírez-Cedeño, Ricardo Infante-Castillo, Nataly J. Gálan-Freyle et Samuel P. Hernández-Rivera. « Surface Persistence of Trace Level Deposits of Highly Energetic Materials ». Molecules 24, n^o 19 (26 septembre 2019) : 3494. http://dx.doi.org/10.3390/molecules24193494.

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In the fields of Security and Defense, explosive traces must be analyzed at the sites of the terrorist events. The persistence on surfaces of these traces depends on the sublimation processes and the interactions with the surfaces. This study presents evidence that the sublimation process of these traces on stainless steel (SS) surfaces is very different than in bulk quantities. The enthalpies of sublimation of traces of four highly energetic materials: triacetone triperoxide (TATP), 2,4-dinitrotoluene (DNT), 2,4,6-trinitrotoluene (TNT), and 1,3,5- trinitrohexahydro-s-triazine (RDX) deposited on SS substrates were determined by optical fiber coupled-grazing angle probe Fourier Transform Infrared (FTIR) Spectroscopy. These were compared with enthalpies of sublimation determined by thermal gravimetric analysis for bulk amounts and differences between them were found. The sublimation enthalpy of RDX was very different for traces than for bulk quantities, attributed to two main factors. First, the beta-RDX phase was present at trace levels, unlike the case of bulk amounts which consisted only of the alpha-RDX phase. Second, an interaction between the RDX and SS was found. This interaction energy was determined using grazing angle FTIR microscopy. In the case of DNT and TNT, bulk and traces enthalpies were statistically similar, but it is evidenced that at the level of traces a metastable phase was observed. Finally, for TATP the enthalpies were statistically identical, but a non-linear behavior and a change of heat capacity values different from zero was found for both trace and bulk phases.

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Rumyantseva, Marina, Abulkosim Nasriddinov, Valeriy Krivetskiy et Alexander Gaskov. « Light—Assisted Low Temperature Formaldehyde Detection at Sub-ppm Level Using Metal Oxide Semiconductor Gas Sensors ». Proceedings 14, n^o 1 (19 juin 2019) : 37. http://dx.doi.org/10.3390/proceedings2019014037.

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Taylor, Vivien F., Annie Carter, Colin Davies et Brian P. Jackson. « Trace-level automated mercury speciation analysis ». Analytical Methods 3, n^o 5 (2011) : 1143. http://dx.doi.org/10.1039/c0ay00528b.

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Bakker, Eric, et Ernö Pretsch. « Potentiometric sensors for trace-level analysis ». TrAC Trends in Analytical Chemistry 24, n^o 3 (mars 2005) : 199–207. http://dx.doi.org/10.1016/j.trac.2005.01.003.

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Vázquez, M., M. Calatayud, C. Jadán Piedra, G. M. Chiocchetti, D. Vélez et V. Devesa. « Toxic trace elements at gastrointestinal level ». Food and Chemical Toxicology 86 (décembre 2015) : 163–75. http://dx.doi.org/10.1016/j.fct.2015.10.006.

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Castrilleia, Y., E. Barrado, R. Pardo et P. Sánchez Batanero. « Polarographic Determination of Thorium at Trace Level ». Analytical Letters 19, n^o 3-4 (janvier 1986) : 363–74. http://dx.doi.org/10.1080/00032718608064502.

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Kiso, Yoshiaki, Satoshi Asaoka, Yuki Kamimoto, Seiya Tanimoto et Kuriko Yokota. « Detection tube method for trace level arsenic ». Journal of Environmental Chemical Engineering 3, n^o 1 (mars 2015) : 40–45. http://dx.doi.org/10.1016/j.jece.2014.11.017.

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CASTRILLEJO, Y., R. PARDO, E. BARRADO et P. BATANERO. « Polarographic determination of zirconium at trace level ». Talanta 32, n^o 5 (mai 1985) : 407–10. http://dx.doi.org/10.1016/0039-9140(85)80107-7.

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Buckman, A. Bruce. « Fiber optic trace level hazardous substance sensor ». Waste Management 13, n^o 5-7 (janvier 1993) : 517. http://dx.doi.org/10.1016/0956-053x(93)90090-j.

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Archundia, C., K. E. Collins et C. H. Collins. « Hydration isomers of trace-level Cr (III) ». International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry 33, n^o 3 (janvier 1989) : 260. http://dx.doi.org/10.1016/1359-0197(89)90159-8.

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13

Ma, Yuanyuan, Siyuan Cao, James W. Rector et Zhishuai Zhang. « Automated arrival-time picking using a pixel-level network ». GEOPHYSICS 85, n^o 5 (1 septembre 2020) : V415—V423. http://dx.doi.org/10.1190/geo2019-0792.1.

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Arrival-time picking is an essential step in seismic processing and imaging. The explosion of seismic data volume requires automated arrival-time picking in a faster and more reliable way than existing methods. We have treated arrival-time picking as a binary image segmentation problem and used an improved pixel-wise convolutional network to pick arrival times automatically. Incorporating continuous spatial information in training enables us to preserve the arrival-time correlation between nearby traces, thus helping to reduce the risk of picking outliers that are common in a traditional trace-by-trace picking method. To train the network, we first convert seismic traces into gray-scale images. Image pixels before manually picked arrival times are labeled with zeros, and those after are tagged with ones. After training and validation, the network automatically learns representative features and generates a probability map to predict the arrival time. We apply the network to a field microseismic data set that was not used for training or validation to test the performance of the method. Then, we analyze the effects of training data volume and signal-to-noise ratio on our autopicking method. We also find the difference between 1D and 2D training data with borehole seismic data. Microseismic and borehole seismic data indicate the proposed network can improve efficiency and accuracy over traditional automated picking methods.

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14

Frey, R. W., et R. Gold Ring. « Marine event beds and recolonization surfaces as revealed by trace fossil analysis ». Geological Magazine 129, n^o 3 (mai 1992) : 325–35. http://dx.doi.org/10.1017/s0016756800019269.

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AbstractTurbidites and tempestites exhibit characteristic distributions of trace fossils. To gain maximum advantage of the sedimentological and palaeoecological significance of these traces, an attempt should be made to relate each trace to the associated colonization surface. This approach allows traces initiated at the normal top of an event bed to be distinguished from traces that subsequently passed into the bed from a higher colonization level or were initiated on the eroded surface of the bed.

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15

Zivkovic, Vladimir, der van, Ed Deprettere et Kock de. « A new approach for system-level architecture exploration ». Facta universitatis - series : Electronics and Energetics 16, n^o 1 (2003) : 103–14. http://dx.doi.org/10.2298/fuee0301103z.

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In this paper, we present a new design-space exploration approach which we call the symbolic program approach. The symbolic program approach is based on both the trace driven approach and the control data flow graph approach. As expected, the trajectory of the symbolic program approach appears somewhere in-between the two extremes mentioned above. Thus, it leads to the shorter simulation time while it can still give fairly accurate performance numbers. Moreover, it produces results that can be readily taken as input for further design. Keywords: System-level, design-space exploration traces, CDFG, symbolic programs.

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16

De Koninck, Pieter, Klaas Nelissen, Seppe vanden Broucke, Bart Baesens, Monique Snoeck et Jochen De Weerdt. « Expert-driven trace clustering with instance-level constraints ». Knowledge and Information Systems 63, n^o 5 (1 mars 2021) : 1197–220. http://dx.doi.org/10.1007/s10115-021-01548-6.

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Brown, K. K., P. Tomboulian et S. M. Walters. « Trace level quantitation of phenyltin compounds using HPTLC ». Journal of Research of the National Bureau of Standards 93, n^o 3 (mai 1988) : 301. http://dx.doi.org/10.6028/jres.093.054.

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Rokka, Mervi, Marika Jestoi et Kimmo Peltonen. « Trace Level Determination of Polyether Ionophores in Feed ». BioMed Research International 2013 (2013) : 1–12. http://dx.doi.org/10.1155/2013/151363.

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A liquid chromatography-mass spectrometric method was developed and validated to determine six polyether ionophores (lasalocid sodium, monensin sodium, salinomycin sodium, narasin, maduramicin ammonium alpha, and semduramicin sodium) in feed samples. The method developed was very straightforward, involving extraction with 84% acetonitrile of the coccidiostats from the feed samples and filtration of the raw extract prior to chromatographic analysis. Method validation included the determination of selectivity, linearity, specificity, repeatability, the limit of detection, limit of quantification, decision limit (CCα), detection capability (CCβ), and recovery. Feed samples from the Finnish national feed control programme and suspected carry-over samples from a feed manufacturer were analysed in parallel with an existing liquid chromatography method coupled with ultraviolet detection. All feed control samples were negative in LC-UV, but with the developed MS method, monensin, salinomycin, and narasin were detected at concentrations of <0.025–0.73 mg/kg, <0.025–0.027 mg/kg, and <0.025–1.6 mg/kg, respectively. In suspected carry-over samples after an output of 2.0 tonnes of unmedicated feed in the pelletizer line, the concentrations of monensin, salinomycin, and narasin varied from undetected to 16 mg/kg. In the mixer line, after 3.2 tonnes of unmedicated feed output, the concentrations of monensin, salinomycin, and narasin varied from undetected to 2.4 mg/kg.

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19

Chumbimuni-Torres, Karin Y., Nastassia Rubinova, Aleksandar Radu, Lauro T. Kubota et Eric Bakker. « Solid Contact Potentiometric Sensors for Trace Level Measurements ». Analytical Chemistry 78, n^o 4 (février 2006) : 1318–22. http://dx.doi.org/10.1021/ac050749y.

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Hopkins, J. L., K. A. Cohen, F. W. Hatch, T. Phil Pitner, J. M. Stevenson et F. K. Hess. « Pharmaceuticals : tracking down an unidentified trace level constituent ». Analytical Chemistry 59, n^o 11 (juin 1987) : 784A—[790A]. http://dx.doi.org/10.1021/ac00138a002.

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Senseman, Scott A., Terry L. Lavy, John D. Mattice, Edward E. Gbur et Briggs W. Skulman. « Trace Level Pesticide Detections in Arkansas Surface Waters ». Environmental Science & ; Technology 31, n^o 2 (février 1997) : 395–401. http://dx.doi.org/10.1021/es960244c.

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Newbury, DE, et N. Ritchie. « Measuring Trace Level Constituents with SEM/SDD-EDS ». Microscopy and Microanalysis 15, S2 (juillet 2009) : 6–7. http://dx.doi.org/10.1017/s1431927609092538.

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Weil, Heike, et Klaus Haberer. « Multimethod for pesticides in soil at trace level ». Fresenius' Journal of Analytical Chemistry 339, n^o 6 (1991) : 405–8. http://dx.doi.org/10.1007/bf00322359.

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Tolu, Julie, Isabelle Le Hécho, Maïté Bueno, Yves Thiry et Martine Potin-Gautier. « Selenium speciation analysis at trace level in soils ». Analytica Chimica Acta 684, n^o 1-2 (janvier 2011) : 126–33. http://dx.doi.org/10.1016/j.aca.2010.10.044.

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Porter, P. Steven, et Robert C. Ward. « ESTIMATING CENTRAL TENDENCY FROM UNCENSORED TRACE LEVEL MEASUREMENTS ». Journal of the American Water Resources Association 27, n^o 4 (août 1991) : 687–700. http://dx.doi.org/10.1111/j.1752-1688.1991.tb01470.x.

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Koushiro, Takenori, Toshinori Sato et Itsujiro Arita. « A trace-level value predictor for Contrail processors ». ACM SIGARCH Computer Architecture News 31, n^o 3 (juin 2003) : 42–47. http://dx.doi.org/10.1145/882105.882112.

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Pandurangappa, Malingappa, et Kempahanumakkagaari Suresh Kumar. « Trace Level Arsenic Quantification through Methyl Red Bromination ». American Journal of Analytical Chemistry 03, n^o 07 (2012) : 455–61. http://dx.doi.org/10.4236/ajac.2012.37060.

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Lengyel, Miklos, Kuan-Yu Shen, Deanna M. Lanigan, Jonathan M. Martin, Xiaofeng Zhang et Richard L. Axelbaum. « Trace level doping of lithium-rich cathode materials ». Journal of Materials Chemistry A 4, n^o 9 (2016) : 3538–45. http://dx.doi.org/10.1039/c5ta07764h.

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Zlatkis, A., L. Ghaoui, S. Weisner et H. Shanfield. « A new adsorbent for trace level organic contaminants ». Chromatographia 20, n^o 6 (juin 1985) : 343–46. http://dx.doi.org/10.1007/bf02269059.

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Caetano, Manuel, Leonardo Padrino T, Hector Guti�rrez, Alberto J. Fern�ndez et Jimmy Castillo. « Trace level vanadium determination using thermal lens spectrophotometry ». Mikrochimica Acta 128, n^o 3-4 (septembre 1998) : 169–75. http://dx.doi.org/10.1007/bf01243045.

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Almelia, Mark P. « The BSCA Graduates’ Level Of Satisfaction ». Proceedings Journal of Interdisciplinary Research 2 (10 octobre 2015) : 126–33. http://dx.doi.org/10.21016/irrc.2015.au10ef84o.

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The research study aimed to trace the BSCA graduates of JBLFMU-Molo and know their level of satisfaction. The descriptive survey research design was employed in the study. The participants were the 64 conveniently selected BSCA graduates in the years 2009, 2010, 2011, 2012 and 2013. The data used were responses from the graduates with the use of the alumni tracer questionnaire. Descriptive statistics used were mean, frequency count and content analysis. Inferential statistics included a t-test for independent samples and One-Way ANOVA set at .05 alpha. Results revealed that the graduates had a “high” employment rate. The level of satisfaction of the graduates was also found to be “moderate”. When classified according to employment status, broker licensure status and year graduated, there was no significant difference existed among their level of satisfaction.

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Besseling, Johan, et Cyrille Artho. « Using Theia Trace Viewer to Visualize JPF Traces ». ACM SIGSOFT Software Engineering Notes 48, n^o 1 (10 janvier 2023) : 22–26. http://dx.doi.org/10.1145/3573074.3573081.

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Java Pathfinder (JPF) is currently the most feature-rich platform for an in-depth analysis of programs that run on the Java Virtual Machine (JVM). However, using JPF and interpreting its results is a challenge. Dependencies on specific Java versions inhibit the adoption of JPF, and its textual output makes it hard to understand its analysis results. To this end, we present the Theia Trace Viewer (TTV) for JPF traces, which features a web-based graphical user interface. It does not only make it easier to get an overview of JPF traces, but it can visualize traces without requiring an installation on the client side, thus making JPF more accessible at the technical level as well. We evaluated TTV with several groups of users, showing the potential of our approach.

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Ismail A. Mohamed, Khalil, Wifaq M. Ali Al-Wattar, Ghada Ibrahim Taha, Saad Hasan Mohammed Ali, Huda Q. Mohammed Abu-Al-Ess, Suha A. Al-Fukhar et Jinan M. Mousa. « Impact of Brucellosis on Interleukin -23 Level, Acid Phosphates and Some Other Trace Elements ». Journal of Pure and Applied Microbiology 12, n^o 4 (30 décembre 2018) : 2011–16. http://dx.doi.org/10.22207/jpam.12.4.37.

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Nagar, Brijlesh Kumar, Sadhan Bijoy Deb, Manoj Kumar Saxena et Bhupendra Singh Tomar. « Quantification of trace level rare earth elements in Al matrices by ICP-MS ». Radiochimica Acta 107, n^o 3 (26 mars 2019) : 215–20. http://dx.doi.org/10.1515/ract-2018-3019.

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Abstract A method has been developed for quantification of trace rare earth (Ce, Dy, Er, Eu, Gd, Ho, La, Nd, Pr, Sm, Tb and Yb) impurities in alumina and aluminum by inductively coupled plasma mass spectrometry (ICP-MS) after matrix separation. The matrix separation was achieved by selective precipitation of trace elements. Due to its refractory nature a microwave digestion method was developed and optimized for the quantitative dissolution of Al2O3. The analytical methodology was validated by recovery studies with standard addition as well as with an independent γ-spectrometry technique using 152,154Eu tracers. The observed recovery in the synthetic samples was in the range of 93–100% with precision within 6.1–11.6 (%RSD), while the same in the case of radio tracer technique were found to be >98% and <2% (RSD), respectively. The method detection limit was found within 0.5–8.3 μg kg−1, respectively. The procedure is simple, organic waste free and suitable for routine analysis.

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Rodríguez, Gabriel, Louis-Noël Pouchet et Juan Touriño. « Representing Integer Sequences Using Piecewise-Affine Loops ». Mathematics 9, n^o 19 (24 septembre 2021) : 2368. http://dx.doi.org/10.3390/math9192368.

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A formal, high-level representation of programs is typically needed for static and dynamic analyses performed by compilers. However, the source code of target applications is not always available in an analyzable form, e.g., to protect intellectual property. To reason on such applications, it becomes necessary to build models from observations of its execution. This paper details an algebraic approach which, taking as input the trace of memory addresses accessed by a single memory reference, synthesizes an affine loop with a single perfectly nested reference that generates the original trace. This approach is extended to support the synthesis of unions of affine loops, useful for minimally modeling traces generated by automatic transformations of polyhedral programs, such as tiling. The resulting system is capable of processing hundreds of gigabytes of trace data in minutes, minimally reconstructing 100% of the static control parts in PolyBench/C applications and 99.99% in the Pluto-tiled versions of these benchmarks. As an application example of the trace modeling method, trace compression is explored. The affine representations built for the memory traces of PolyBench/C codes achieve compression factors of the order of 106 and 103 with respect to gzip for the original and tiled versions of the traces, respectively.

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Matni, Gabriel N. « Operating System Level Trace Analysis for Automated Problem Identification ». Open Cybernetics & ; Systemics Journal 5, n^o 1 (15 juin 2011) : 45–52. http://dx.doi.org/10.2174/1874110x01105010045.

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Lim, Hyuk-Min, Hee-Bong Yoo, Nan-Sook Hong, Inchul Yang, Myung-Sub Han et Sang-Ryoul Park. « Count-based quantitation of trace level macro-DNA molecules ». Metrologia 46, n^o 3 (22 mai 2009) : 375–87. http://dx.doi.org/10.1088/0026-1394/46/3/028.

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Zhang, Zhengjun. « (Invited) Trace Level Detections By Surface-Enhanced Raman Scattering ». ECS Meeting Abstracts MA2020-01, n^o 28 (1 mai 2020) : 2108. http://dx.doi.org/10.1149/ma2020-01282108mtgabs.

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Zhang, Zhengjun. « Trace Level Chemicals Detection By Surface-Enhanced Raman Scattering ». ECS Meeting Abstracts MA2020-01, n^o 33 (1 mai 2020) : 2385. http://dx.doi.org/10.1149/ma2020-01332385mtgabs.

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Cairns, Thomas, et Emil G. Siegmund. « Confirmation of trace level residues in the food supply ». Critical Reviews in Food Science and Nutrition 30, n^o 4 (janvier 1991) : 397–402. http://dx.doi.org/10.1080/10408399109527550.

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Nazarov, A. G., M. A. Klimushenkova, P. M. Dovgalyuk et V. A. Makarov. « Raising the level of abstraction of program’s execution trace ». Proceedings of the Institute for System Programming of RAS 23 (2012) : 93–106. http://dx.doi.org/10.15514/ispras-2012-23-6.

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Meltzer, Carl, et Bi-Shia King. « Trace Element Analysis of Solutions at the PPB Level ». Advances in X-ray Analysis 34 (1990) : 41–55. http://dx.doi.org/10.1154/s0376030800014324.

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We have developed a technique to determine the dissolved solid components of water and other liquids by Energy- Dispersive X-Ray Fluorescence (EDXRF) spectrometry. The liquid samples are presented to the spectrometer as small dried spots of the residue remaining after evaporation of the liquid. The dried residues are mounted on thin plastic films cemented to 35 mm plastic slide mounts. Elements from sodium through uranium are detected with detection limits less than one nanogram in favorable cases. Precision of the measurement is better than 2 % relative in favorable cases for secondary-target excitation, and is typically 5 to 10 % for direct excitation given the geometry of the instrument. Detection limits are as low as a part per billion relative to the original liquid for solutions whose total dissolved solid content is 1000 part per million or less.

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El‐Ghawi, U. M. « The Level of Trace Elements in Tripoli City Groundwater ». Instrumentation Science & ; Technology 33, n^o 5 (septembre 2005) : 609–17. http://dx.doi.org/10.1080/10739140500227096.

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Bhaskar, B. L., S. Anil Kumar et T. M. Mohan Kumar. « Spectrophotometric Evaluation of Trace level Chromium in Alloy Steel ». Asian Journal of Chemistry 29, n^o 9 (2017) : 1917–19. http://dx.doi.org/10.14233/ajchem.2017.20577.

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Asaoka, Satoshi, Yoshiaki Kiso, Masahiro Nagai et Hideo Okamura. « A membrane extraction method for trace level phosphate analysis ». Analytical Methods 7, n^o 21 (2015) : 9268–73. http://dx.doi.org/10.1039/c5ay02019k.

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Sakata, Hiroshi. « Trace formula for Jacobi forms of odd squarefree level ». Journal of Number Theory 182 (janvier 2018) : 57–82. http://dx.doi.org/10.1016/j.jnt.2017.05.010.

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Fielden, P. R., et G. M. Greenway. « Diffusion apparatus for trace level vapor generation of tetramethyllead ». Analytical Chemistry 61, n^o 17 (septembre 1989) : 1993–96. http://dx.doi.org/10.1021/ac00192a046.

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Montani, Stefania, Giorgio Leonardi, Manuel Striani, Silvana Quaglini et Anna Cavallini. « Multi-level abstraction for trace comparison and process discovery ». Expert Systems with Applications 81 (septembre 2017) : 398–409. http://dx.doi.org/10.1016/j.eswa.2017.03.063.

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Mathew, Johnson, Jay Gandhi et Joe Hedrick. « Trace level perchlorate analysis by ion chromatography–mass spectrometry ». Journal of Chromatography A 1085, n^o 1 (août 2005) : 54–59. http://dx.doi.org/10.1016/j.chroma.2005.05.015.

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Vendrig, D. E. M. M., et J. J. M. Holthuis. « Trace level analysis of vinca alkaloids in biological fluids ». TrAC Trends in Analytical Chemistry 8, n^o 4 (avril 1989) : 141–45. http://dx.doi.org/10.1016/0165-9936(89)85024-1.

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Articles de revues sur le sujet « Trace level »

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