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Journal articles on the topic 'Second phase sampling'

Author: Grafiati

Published: 8 September 2023

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1

Delmelle, Eric M., and Pierre Goovaerts. "Second-phase sampling designs for non-stationary spatial variables." Geoderma 153, no. 1-2 (2009): 205–16. http://dx.doi.org/10.1016/j.geoderma.2009.08.007.

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2

Li, H. G., H. T. Schreuder, D. D. Van Hooser, and G. E. Brink. "Estimating Strata Means in Double Sampling with Corrections Based on Second-Phase Sampling." Biometrics 48, no. 1 (1992): 189. http://dx.doi.org/10.2307/2532749.

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Kamba, Adamu Isah, Amos Adedayo Adewara, and Audu Ahmed. "Modified product estimator under two–phase sampling." Global Journal of Pure and Applied Sciences 25, no. 2 (2019): 201–8. http://dx.doi.org/10.4314/gjpas.v25i2.10.

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In this paper, modification of product estimator under two-phase sampling was suggested. The modified product estimator was obtained through transformation in two cases using sample mean of auxiliary variables. Case one was when the second sample was drawn from the first sample while case two was when the second sample was drawn from the population. The bias and mean square error (MSE) of the modified product estimator was obtained. The theoretical and numerical validity of the modified product estimator under the two cases were determined to show it superiority to some considered existing pro

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Singh, Rajesh, and Prayas Sharma. "Efficient Estimators Using Auxiliary Variable under Second Order Approximation in Simple Random Sampling and Two-Phase Sampling." Advances in Statistics 2014 (September 3, 2014): 1–9. http://dx.doi.org/10.1155/2014/974604.

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This paper suggests some estimators for population mean of the study variable in simple random sampling and two-phase sampling using information on an auxiliary variable under second order approximation. Bahl and Tuteja (1991) and Singh et al. (2008) proposed some efficient estimators and studied the properties of the estimators to the first order of approximation. In this paper, we have tried to find out the second order biases and mean square errors of these estimators using information on auxiliary variable based on simple random sampling and two-phase sampling. Finally, an empirical study

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Ji, Chao, James D. Englehardt, and Cynthia Juyne Beegle-Krause. "Design of Real—Time Sampling Strategies for Submerged Oil Based on Probabilistic Model Predictions." Journal of Marine Science and Engineering 8, no. 12 (2020): 984. http://dx.doi.org/10.3390/jmse8120984.

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Locating and tracking submerged oil in the mid depths of the ocean is challenging during an oil spill response, due to the deep, wide-spread and long-lasting distributions of submerged oil. Due to the limited area that a ship or AUV can visit, efficient sampling methods are needed to reveal the real distributions of submerged oil. In this paper, several sampling plans are developed for collecting submerged oil samples using different sampling methods combined with forecasts by a submerged oil model, SOSim (Subsurface Oil Simulator). SOSim is a Bayesian probabilistic model that uses real time f

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Sang, Hailin, Kenneth K. Lopiano, Denise A. Abreu, Andrea C. Lamas, Pam Arroway, and Linda J. Young. "Adjusting for Misclassification: A Three-Phase Sampling Approach." Journal of Official Statistics 33, no. 1 (2017): 207–22. http://dx.doi.org/10.1515/jos-2017-0011.

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Abstract The United States Department of Agriculture’s National Agricultural Statistics Service (NASS) conducts the June Agricultural Survey (JAS) annually. Substantial misclassification occurs during the prescreening process and from field-estimating farm status for nonresponse and inaccessible records, resulting in a biased estimate of the number of US farms from the JAS. Here, the Annual Land Utilization Survey (ALUS) is proposed as a follow-on survey to the JAS to adjust the estimates of the number of US farms and other important variables. A three-phase survey design-based estimator is de

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Mandallaz, Daniel. "A three-phase sampling extension of the generalized regression estimator with partially exhaustive information." Canadian Journal of Forest Research 44, no. 4 (2014): 383–88. http://dx.doi.org/10.1139/cjfr-2013-0449.

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We consider three-phase sampling schemes in which one component of the auxiliary information is known in the very large sample of the so-called null phase and the second component is available only in the large sample of the first phase, whereas the second phase provides the terrestrial inventory data. We extend to three-phase sampling the generalized regression estimator that applies when the null phase is exhaustive, for global and local estimation, and derive its asymptotic design-based variance. The new three-phase regression estimator is particularly useful for reducing substantially the

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Fischer, Christoph, and Joachim Saborowski. "Variance estimation for mean growth from successive double sampling for stratification." Canadian Journal of Forest Research 50, no. 12 (2020): 1405–11. http://dx.doi.org/10.1139/cjfr-2020-0058.

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Double sampling for stratification (2SS) is a sampling design that is widely used for forest inventories. We present the mathematical derivation of two appropriate variance estimators for mean growth from repeated 2SS with updated stratification on each measurement occasion. Both estimators account for substratification based on the transition of sampling units among the strata due to the updated allocation. For the first estimator, sizes of the substrata were estimated from the second-phase sample (sample plots), whereas the respective sizes in the second variance estimator relied on the larg

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9

Šmelková, Ľ. "Inventory of plant material in forest nurseries by combining an ocular estimate and sampling measurements." Journal of Forest Science 48, No. 4 (2019): 156–65. http://dx.doi.org/10.17221/11869-jfs.

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Two procedures of the plant material inventories in forest nurseries, used until now, are evaluated: ocular estimate and sampling. A new two-phase sampling procedure has been proposed on the basis of a suitable combination of estimation and counting and/or measurement of seedlings and plants. The optimum size of the sampling unit (length of bed segment) has been defined. The necessary number of bed segments on which the ocular estimation should be performed in the first phase (n1), and subsequently a more exact assessment of the number of individuals and/or their other qualitative and quantita

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10

Mandallaz, Daniel, Jochen Breschan, and Andreas Hill. "New regression estimators in forest inventories with two-phase sampling and partially exhaustive information: a design-based Monte Carlo approach with applications to small-area estimation." Canadian Journal of Forest Research 43, no. 11 (2013): 1023–31. http://dx.doi.org/10.1139/cjfr-2013-0181.

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We consider two-phase sampling schemes where one component of the auxiliary information is known in every point (“wall-to-wall”) and a second component is available only in the large sample of the first phase, whereas the second phase yields a subsample with the terrestrial inventory. This setup is of growing interest in forest inventory thanks to the recent advances in remote sensing, in particular, the availability of LiDAR data. We propose a new two-phase regression estimator for global and local estimation and derive its asymptotic design-based variance. The new estimator performs better t

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Mandallaz, Daniel, and Adrian Lanz. "Forest inventory: further results for optimal sampling schemes based on the anticipated variance." Canadian Journal of Forest Research 31, no. 10 (2001): 1845–53. http://dx.doi.org/10.1139/x01-099.

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This work presents optimal allocation rules for two-phase, two-stage sampling schemes in which the sampling density and the costs of the second phase can vary over domains. The optimality criterion is based on the anticipated variance. It also gives an improved version of discrete approximation for the resulting inclusion probabilities. An example illustrates the theory.

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12

Zeeshan, S. M., and G. K. Vishwakarma. "Improved strategy for computation of population mean under double stratified sampling framework." Journal of Applied Mathematics, Statistics and Informatics 17, no. 2 (2021): 91–102. http://dx.doi.org/10.2478/jamsi-2021-0011.

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Abstract The article contains a new technique to estimate the mean of the variate of the interest of the finite population with the help of two auxiliary variates. The technique complies well with the stratified population in which each strata proportion is predicted by taking an initial sample called the first phase sample. When the first phase sample is taken, a second sample is taken from the first sample which is called the second phase sample which is used to estimate the mean of the variate of the interest. In our study, we have considered the population which has two correlated auxiliar

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Yang, Haitao, Zongwu Xie, Cao Li, Xiaoyu Zhao, and Minghe Jin. "Path optimization of excavating manipulator in lunar soil sampling." Industrial Robot: An International Journal 43, no. 1 (2016): 65–76. http://dx.doi.org/10.1108/ir-06-2015-0119.

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Purpose – The purpose of this paper is to study the path optimization method of the manipulator in the lunar soil excavation and sampling process. The current research is a practical need for the excavation and sampling of the lunar soil in the lunar exploration project. Design/methodology/approach – This paper proposes the objective function and constraints for path optimization during the excavation process of the lunar soil, regarding excavation time and energy consumption as the two key fitness indexes by analyzing the whole excavation process of the lunar soil. Specifically, the optimizat

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Mandallaz, Daniel, and Alexander Massey. "Comparison of estimators in one-phase two-stage Poisson sampling in forest inventories." Canadian Journal of Forest Research 42, no. 10 (2012): 1865–71. http://dx.doi.org/10.1139/x2012-110.

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In the context of Poisson sampling, numerous adjustments to classical estimators have been proposed that are intended to compensate for inflated variance due to random sample size. However, such adjustments have never been applied to extensive forest inventories. This work investigates the performances of four estimators for the timber volume in one-phase two-stage forest inventories, where trees in the first stage are selected, at the plot level, by concentric circles or angle-count methods and a subset thereof are selected by Poisson sampling for further measurements to get a better estimati

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15

Grastien, Alban, and Enrico Scala. "Sampling Strategies for Conformant Planning." Proceedings of the International Conference on Automated Planning and Scheduling 28 (June 15, 2018): 97–105. http://dx.doi.org/10.1609/icaps.v28i1.13894.

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We present a generalisation of CPCES, a conformant planner that uses two procedures: candidate plan generation and sampling of the initial belief state. The new CPCES better distinguishes these two procedures and therefore provides a clearer framework for the resolution of conformant planning problems. We study CPCES theoretically by analysing the sampling phase through the lens of tags, width and basis. The benefit of this new interpretation is twofold: firstly it allows us to bound the maximum number of iterations required by CPCES, and second it allows us to individuate sampling strategies

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16

Baek, Jein. "Design of the Optimal Phase for the Interpolant Filter in the Second-order Bandpass Sampling System." Journal of the Institute of Electronics and Information Engineers 53, no. 3 (2016): 132–39. http://dx.doi.org/10.5573/ieie.2016.53.3.132.

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17

Abou Ali, Hala, Reda Mazloum, and Sara Osama Ahmed. "A second phase sampling design for monitoring the nitrogen dioxide in Greater Cairo and Delta, Egypt." International Journal of Global Environmental Issues 19, no. 4 (2020): 295. http://dx.doi.org/10.1504/ijgenvi.2020.10039021.

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Ahmed, Sara Osama, Reda Mazloum, and Hala Abou Ali. "A second phase sampling design for monitoring the nitrogen dioxide in Greater Cairo and Delta, Egypt." International Journal of Global Environmental Issues 19, no. 4 (2020): 295. http://dx.doi.org/10.1504/ijgenvi.2020.115902.

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19

MILLER-IHLI, N. J. "Slurry Sampling Electrothermal Atomic Absorption Spectrometry: Results From the Second Phase of an International Collaborative Study." Journal of Analytical Atomic Spectrometry 12, no. 2 (1997): 205–12. http://dx.doi.org/10.1039/a606058g.

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20

Agarwal, Gaajendra K., Sira M. Allende, and Carlos N. Bouza. "Double Sampling with Ranked Set Selection in the Second Phase with Nonresponse: Analytical Results and Monte Carlo Experiences." Journal of Probability and Statistics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/214959.

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This paper is devoted to the study of the behavior of the use of double sampling for dealing with nonresponses, when ranked set sample is used. The characteristics of the sampling strategies are derived. The structure of the errors generated the need of studying of the optimality of the strategies by performing a set Monte Carlo experiments.

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21

Fatima, Syeda Aliya, Syeda Tasneem Fatima, and S. Khurram Khan Alwi. "Major Causes of Female Dropouts at Different Educational Levels in Karachi." Global Educational Studies Review VI, no. I (2021): 293–305. http://dx.doi.org/10.31703/gesr.2021(vi-i).30.

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This research revolves around the causes of female dropouts in Karachi at different educational levels, including primary, secondary, high school and university levels. In this research exploratory sequential mixed method has been used. After the literature review, the phenomenological research method for the qualitative phase of research has been adopted. In this regard, the interviews have been taken by different educationalists in Karachi on the basis of their experience and age via the convenience sampling method. All the hypotheses have been tested and accepted at this stage. Under the um

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22

Szatmári, Gábor, Péter László, Katalin Takács, et al. "Optimization of second-phase sampling for multivariate soil mapping purposes: Case study from a wine region, Hungary." Geoderma 352 (October 2019): 373–84. http://dx.doi.org/10.1016/j.geoderma.2018.02.030.

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23

Mandallaz, D. "Optimal sampling schemes based on the anticipated variance with lack of fit." Canadian Journal of Forest Research 32, no. 12 (2002): 2236–43. http://dx.doi.org/10.1139/x02-145.

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This note presents an important improvement for optimal sampling schemes based on the anticipated variance. The anticipated variance is defined as the average of the design-based variance under a simple stochastic model in which the trees are assumed to be uniformly and independently distributed within a given number of so-called Poisson strata. We consider two-phase two-stage cluster sampling schemes in which costs and terrestrial second-phase sampling density can vary over domains. The estimation procedure is based on post-stratification with respect to so-called working strata that do not n

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24

Liu, Yiyang, Yang Zhao, Shuaihua Yan, Chunhe Song, and Fei Li. "A Sampling-Based Algorithm with the Metropolis Acceptance Criterion for Robot Motion Planning." Sensors 22, no. 23 (2022): 9203. http://dx.doi.org/10.3390/s22239203.

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Motion planning is one of the important research topics of robotics. As an improvement of Rapidly exploring Random Tree (RRT), the RRT* motion planning algorithm is widely used because of its asymptotic optimality. However, the running time of RRT* increases rapidly with the number of potential path vertices, resulting in slow convergence or even an inability to converge, which seriously reduces the performance and practical value of RRT*. To solve this issue, this paper proposes a two-phase motion planning algorithm named Metropolis RRT* (M-RRT*) based on the Metropolis acceptance criterion.

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25

Anieting, Akan. "Two- Phase Stratified Sampling Estimator for Population Mean in The Presence of Nonresponse Using Single Auxiliary Variable." Mathematical Journal of Interdisciplinary Sciences 8, no. 2 (2020): 49–56. http://dx.doi.org/10.15415/mjis.2020.82006.

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In this article, a new estimator for population mean in two-phase stratified sampling in the presence of nonresponse using single auxiliary variable has been proposed. The bias and Mean Squared Error (MSE) of the proposed estimator has been given using large sample approximation. The empirical study shows that the MSE of the proposed estimator is more efficient than existing estimators. The optimum values of first and second phase sample have been determined.

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Barral, Julien, and Stéphane Seuret. "RANDOM SPARSE SAMPLING IN A GIBBS WEIGHTED TREE AND PHASE TRANSITIONS." Journal of the Institute of Mathematics of Jussieu 19, no. 1 (2018): 65–116. http://dx.doi.org/10.1017/s1474748017000433.

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Let $\unicode[STIX]{x1D707}$ be the projection on $[0,1]$ of a Gibbs measure on $\unicode[STIX]{x1D6F4}=\{0,1\}^{\mathbb{N}}$ (or more generally a Gibbs capacity) associated with a Hölder potential. The thermodynamic and multifractal properties of $\unicode[STIX]{x1D707}$ are well known to be linked via the multifractal formalism. We study the impact of a random sampling procedure on this structure. More precisely, let $\{{I_{w}\}}_{w\in \unicode[STIX]{x1D6F4}^{\ast }}$ stand for the collection of dyadic subintervals of $[0,1]$ naturally indexed by the finite dyadic words. Fix $\unicode[STIX]{

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27

Huang, Ying. "Evaluating and comparing biomarkers with respect to the area under the receiver operating characteristics curve in two-phase case–control studies." Biostatistics 17, no. 3 (2016): 499–522. http://dx.doi.org/10.1093/biostatistics/kxw003.

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Abstract Two-phase sampling design, where biomarkers are subsampled from a phase-one cohort sample representative of the target population, has become the gold standard in biomarker evaluation. Many two-phase case–control studies involve biased sampling of cases and/or controls in the second phase. For example, controls are often frequency-matched to cases with respect to other covariates. Ignoring biased sampling of cases and/or controls can lead to biased inference regarding biomarkers' classification accuracy. Considering the problems of estimating and comparing the area under the receiver

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Tiwari, Ashish, Manish Kumar, and Sarvesh Kumar Dubey. "A Generalized Approach for Estimation of a Finite Population Mean in Two-Phase Sampling." Asian Journal of Probability and Statistics 21, no. 3 (2023): 45–58. http://dx.doi.org/10.9734/ajpas/2023/v21i3467.

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The present paper deals with the formulation of a generalized class of ratio-cum-product estimators for the estimation of a finite population mean in two-phase sampling. The mathematical expressions for the mean square errors (MSEs) of the preliminary and proposed estimators are derived. It has been established that the proposed class encompasses a wide range of estimators for specific choices of the scalars. The relative performance of the proposed class, as compared to the preliminary estimators, is evaluated using the MSE criterion. In addition, optimum sample sizes of the first-phase and s

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Dudney, C. S., D. L. Wilson, R. B. Gammage, and H. L. Scott. "The Department of Energy's Radon Testing Programme." Radiation Protection Dosimetry 56, no. 1-4 (1994): 247–50. http://dx.doi.org/10.1093/oxfordjournals.rpd.a082463.

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Abstract The US Department of Energy (DOE) conducted an initial study of indoor radon in buildings under its control in response to Public Law 100-551, the Indoor Radon Abatement Act, enacted by the US Congress in 1988. Other federal agencies have also conducted radon surveys. This paper presents an overview of the results from radon testing of several thousand buildings ranging from 100 m2 to over 10,000 m2 in size. In addition, results from groups of buildings have been examined, classified according to ventilation and usage characteristics. So far, there is no apparent difference among buil

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Meadseena, Arun, and Jiraporn Chano. "Enhancing English Language Skills of Upper Secondary Students through Content and Language Integrated Learning." Journal of Educational Issues 9, no. 1 (2023): 72. http://dx.doi.org/10.5296/jei.v9i1.20597.

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The purposes of this research aimed to enhance English language skills of upper secondary students through content and language integrated learning. The research procedures involved three phases as following: the first phase studied fundamental information. The second phase designed and developed the instructional strategies. The third phase implemented instructional model to enhance English language skills through content and language integrated learning. Forty of 11th grade students, second semester of academic year of 2018 selected through cluster random sampling. The assessment tools were

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Cho, Chihyun, Hyunji Koo, Jae-Yong Kwon, and Joo-Gwang Lee. "Phase calibration and uncertainty evaluation for a RF comb generator." Measurement and Control 53, no. 3-4 (2020): 698–703. http://dx.doi.org/10.1177/0020294019901301.

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In this paper, we present calibration and uncertainty evaluation methods for the phase of a radio-frequency comb generator using a calibrated sampling oscilloscope. In addition, we present many solutions that are indispensable for the precise calibration of phase up to 50 GHz. First, we correct the sampling time error, which is the systematic error of the equivalent time sampling system. Second, the frequency response of the oscilloscope is de-convoluted from the measured pulse, and the impedance mismatch between the radio-frequency comb generator and the oscilloscope is calibrated. Finally, w

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Takeuchi, Makoto, and Haruo Saito. "Absolute measurement of sampling jitter in audio equipment." Journal of the Acoustical Society of America 154, no. 1 (2023): 443–53. http://dx.doi.org/10.1121/10.0020291.

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This study proposes a method for analyzing sampling jitter in audio equipment based on the time-domain analysis, considering the temporal fluctuations of the zero-crossing points in the recorded sinusoidal waves to characterize the jitter. This method enabled the separate evaluation of jitter in an audio player from those in audio recorders when the same playback signal is simultaneously fed into two audio recorders. The experiments were conducted using commercially available portable devices with a maximum sampling rate of 192 000 samples per second. The results demonstrated that jitter value

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Nunemaker, Craig S., David H. Wasserman, Owen P. McGuinness, Ian R. Sweet, Jeanette C. Teague, and Leslie S. Satin. "Insulin secretion in the conscious mouse is biphasic and pulsatile." American Journal of Physiology-Endocrinology and Metabolism 290, no. 3 (2006): E523—E529. http://dx.doi.org/10.1152/ajpendo.00392.2005.

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Islets in most species respond to increased glucose with biphasic insulin secretion, marked by a sharp first-phase peak and a slowly rising second phase. Mouse islets in vitro, however, lack a robust second phase. To date, this observation has not been extended in vivo. We thus compared insulin secretion from conscious mice with isolated mouse islets in vitro. The arterial plasma insulin response to a hyperglycemic clamp was measured in conscious mice 1 wk after surgical implantation of carotid artery and jugular vein catheters. Mice were transfused using clamps with blood from a donor mouse t

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Cahyadi, Ani, Hendryadi Hendryadi, and Suryani Suryani. "Thoughts on Incivility: A Preliminary Study to Identify Uncivil Behavior in Indonesian Higher Education." Journal of Ethnic and Cultural Studies 8, no. 1 (2020): 129. http://dx.doi.org/10.29333/ejecs/593.

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This preliminary study aims to identify an item list of uncivil behaviors in the Indonesian educational environment. The study comprises three phases: first, a panel of experts assessed each item to ensure their content validity for items pool. The second phase used a cross-sectional design and convenience sampling to recruit 524 students and faculty members in seven provinces in Indonesia using an online survey. The third phase involved ten students from the second phase and several faculty representatives were randomly selected to complete the open-ended questionnaire. Principal component an

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Batool, Faiza, Dr Najma Sadiqa, and Dr Ume Laila. "Second Screen Phenomena and News Consumption in Pakistan." Journal of Peace, Development & Communication Volume 4, Issue 3 (2020): 63–88. http://dx.doi.org/10.36968/jpdc-v04-i03-05.

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The second screen phenomenon is a hybrid media process referring to the complementary and simultaneous use of television and a second web-connected screen for media consumption. The present study examined the impact of demographic characteristics (i.e. gender, age, education, and income) on audience activity for second screen news consumption in Pakistan. An online survey based on snowball sampling was conducted from 400 respondents. The results showed that gender only plays a role in usage during post exposure. The age was comparatively a strong predictor of audience activity. It has a positi

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Ngo, Linh Dan, Dumitru Duca, Yvain Carpentier, et al. "Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method." Atmospheric Measurement Techniques 13, no. 2 (2020): 951–67. http://dx.doi.org/10.5194/amt-13-951-2020.

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Abstract. Combustion of hydrocarbons produces both particulate- and gas-phase emissions responsible for major impacts on atmospheric chemistry and human health. Ascertaining the impact of these emissions, especially on human health, is not straightforward because of our relatively poor knowledge of how chemical compounds are partitioned between the particle and gas phases. Accordingly, we propose coupling a two-filter sampling method with a multi-technique analytical approach to fully characterize the particulate- and gas-phase compositions of combustion by-products. The two-filter sampling me

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Zacks, Shelemyahu. "Two-stage and sequential sampling for estimation and testing with prescribed precision." Encyclopedia with Semantic Computing and Robotic Intelligence 01, no. 01 (2017): 1650004. http://dx.doi.org/10.1142/s2425038416500048.

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Statistical data analysis includes several phases. First, there is the phase of data collection. Second, there is the phase of analysis and inference. The two phases are interconnected. There are two types of data analysis. One type is called parametric and the other type is nonparametric. In the present paper, we discuss parametric inference. In parametric inference, we model the results of a given experiment as realization of random variables having a particular distribution, which is specified by its parameters. A random sample is a sequence of independent and identically distributed (i.i.d

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Agusti, Fardatil Aini, Afifah Zafirah, Engkizar Engkizar, Fuady Anwar, Zainul Arifin, and Syafrimen Syafril. "THE IMPLANTATION OF CHARACTER VALUES TOWARD STUDENTS THROUGH CONGKAK GAME FOR MATHEMATICS INSTRUCTIONAL MEDIA." Jurnal Penelitian Pendidikan 35, no. 2 (2018): 132–42. http://dx.doi.org/10.15294/jpp.v35i2.13947.

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This research aims to investigate character values that can be applied on students through congkak game as it is used as a media of mathematics learning. This study used qualitative and quantitative combination or (Exploratory mixed methods designs). The first phase of qualitative data was taken through in-depth interviews to 5 selected informants using purposive sampling technique. The first phase of the data retrieval was intended to gather information related to the content of character values contained in congkak game. All data interviews were analyzed thematically using NVivo qualitative

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Hernández-Sánchez, Mónica, Francisco-Shu Kitaura, Metin Ata, and Claudio Dalla Vecchia. "Higher order Hamiltonian Monte Carlo sampling for cosmological large-scale structure analysis." Monthly Notices of the Royal Astronomical Society 502, no. 3 (2021): 3976–92. http://dx.doi.org/10.1093/mnras/stab123.

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ABSTRACT We investigate higher order symplectic integration strategies within Bayesian cosmic density field reconstruction methods. In particular, we study the fourth-order discretization of Hamiltonian equations of motion (EoM). This is achieved by recursively applying the basic second-order leap-frog scheme (considering the single evaluation of the EoM) in a combination of even numbers of forward time integration steps with a single intermediate backward step. This largely reduces the number of evaluations and random gradient computations, as required in the usual second-order case for high-

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Bogard, D. G., and W. G. Tiederman. "Characteristics of ejections in turbulent channel flow." Journal of Fluid Mechanics 179 (June 1987): 1–19. http://dx.doi.org/10.1017/s002211208700140x.

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Quantitative measurements of the structure of ejections from the wall region have been made using conditional-sampling techniques. Discrete ejections from a burst event were identified using fluorescent-dye flow visualization simultaneously with streamwise, u, and normal, v, velocity measurements. These velocity measurements, at y+ = 15, were conditionally sampled based on different phases of the ejection event. Features of the ejection which were educed from the conditional sampling were found to be very sensitive to the phase alignment. Results showed that ejections were characterized by a r

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Ahmed, Ishfaq, and Muhammad Musarrat Nawaz. "An exploration of students’ knowledge and understanding of Istihalah." Journal of Islamic Marketing 7, no. 2 (2016): 213–31. http://dx.doi.org/10.1108/jima-09-2014-0059.

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Purpose The purpose of this study is to investigate the level of understanding of Muslim students about Istihalah. It compares the understanding of students of various departments about Istihalah and changes in their knowledge after a workshop. Design/methodology/approach The study is conducted in two phases. In the first phase, a comparison is made between students of three departments: Islamic studies, business studies and food sciences. These departments were selected using purposive sampling. In the second phase, students with a lack of awareness about Istihalah were given a one-day traini

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Stellingwerf, D. A., and A. de Gier. "Monitoring changes in timber volume using aerial photo plots and field plots in a two-phase sampling design." Netherlands Journal of Agricultural Science 36, no. 2 (1988): 119–25. http://dx.doi.org/10.18174/njas.v36i2.16685.

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Standing timber volume and mean periodic volume increment (of Norway spruce - Picea abies - age 40-100 yr) were determined over a period of 10 yr (1974-84) in a 3000 ha forest area in Austria. The results of a Two-Phase Linear Regression Sampling (TPLRS) method (using 112 circular photo plots in the first phase, and 55 dependent field plots in the second phase, each covering 0.05 ha) were compared with those of a Simple Random Sample (SRS) of only field plots (112). The crown cover percentages per plot were taken as independent variables in the TPLRS. They were stereoscopically determined on 1

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Yao, Guo Zhong, Li Si Ai, Li Zhong Shen, and Gui Yong Wang. "Research on the High-Speed Data Acquisition System Based on Clock Distribution." Advanced Materials Research 834-836 (October 2013): 1039–46. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1039.

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In order to digitize the signal of high frequency or ultra-high frequency, clock distribution technology with the same frequency but different phase is utilized as a solution to this difficulty. The principles of high-speed analog-to-digit converter (ADC) by the lower rate ADC module, key technology and key module of the data acquisition systems are studied. From the aspects of system architecture, clock distribution module based on the AD9520, ADC module based on the AD9480 and data processing, the design method of ultra-high-speed ADC by clock distribution mode are explored. The results show

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Jantakun, Thiti, Kitsadaporn Jantakun, and Thada Jantakoon. "STEAM Education Using Design Thinking Process Through Virtual Communities of Practice (STEAM-DT-VCoPs)." Journal of Educational Issues 7, no. 1 (2021): 249. http://dx.doi.org/10.5296/jei.v7i1.18420.

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These objectives of the study are 1) to design STEAM education using Design Thinking Process through Virtual Communities of Practice (STEAM-DT-VCoPs), and 2) to evaluate the designed STEAM-DT-VCoPs. It divides the research procedures into two phases. The first phase is to design STEAM-DT-VCoPs, and the second phase is to evaluate the STEAM-DT-VCoPs. The sample group of this study comprises fourteen experts selected by purposive sampling. The arithmetic mean and standard deviation analyzed data. The research findings are: 1) The STEAM-DT-VCoPs comprise three steps are 1.1) the role of virtual c

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Perreault, Andrea M. J., Nan Zheng, and Noel G. Cadigan. "Estimation of growth parameters based on length-stratified age samples." Canadian Journal of Fisheries and Aquatic Sciences 77, no. 3 (2020): 439–50. http://dx.doi.org/10.1139/cjfas-2019-0129.

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Response-selective stratified sampling (RSSS) has been well studied in the statistical literature; however, the application of the resulting statistical theories and methods to a specific case of RSSS in fisheries studies, namely length-stratified age sampling (LSAS), is inadequate. We review nine estimation approaches for RSSS found in the statistical and fisheries science literature in terms of three sampling components: the first phase length composition sample, the second phase age composition sample, and the sampling scheme. We compare the performance in terms of RRMSE (relative root mean

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Li, Shuying, Shaowei Wang, and Qiang Li. "Joint Posterior Probability Active Learning for Hyperspectral Image Classification." Remote Sensing 15, no. 16 (2023): 3936. http://dx.doi.org/10.3390/rs15163936.

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Active learning (AL) is an approach that can reduce the dependence on the labeled set significantly. However, most current active-learning methods are only concerned with the first two columns of the posterior probability matrix during the sampling phase. When the difference between the first and second-largest posterior probabilities of several samples is proximate, these approaches fail to distinguish them further. To improve these deficiencies, we propose an active-learning algorithm, joint posterior probabilistic active learning combined with conditional random field (JPPAL_CRF). In the ac

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Jalali, Yousef, Hossein Eskandari, Ahmad Borjali, Faramarz Sohrabi, and Mohammad Asgari. "The identity of Iranian male adolescents in the context of master narrative of their lives: A qualitative study." Shenakht Journal of Psychology and Psychiatry 8, no. 5 (2021): 13–26. http://dx.doi.org/10.32598/shenakht.8.5.13.

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Introduction: There is not in-depth knowledge about the master narrative of identity and its quiddity in current generation of Iranian adolescents. Aim: The aim of this study was to identify and validate the master narrative model of identity of Iranian adolescents. Method: This study was a basic research with a mixed approach. In the qualitative phase, the population consisted of male adolescents aged 15-20 years old, as well as psychologists and sociologists in Tehran in 2020. Nineteen adolescents were selected by convenience sampling and six specialists by purposive sampling. In the quantit

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Zhao, Yuan, Bingliang Hu, Zhen-An He, Wenjia Xie, and Xiaohui Gao. "Generation and coherent detection of QPSK signal using a novel method of digital signal processing." Modern Physics Letters B 32, no. 04 (2018): 1850103. http://dx.doi.org/10.1142/s0217984918501038.

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We demonstrate an optical quadrature phase-shift keying (QPSK) signal transmitter and an optical receiver for demodulating optical QPSK signal with homodyne detection and digital signal processing (DSP). DSP on the homodyne detection scheme is employed without locking the phase of the local oscillator (LO). In this paper, we present an extracting one-dimensional array of down-sampling method for reducing unwanted samples of constellation diagram measurement. Such a novel scheme embodies the following major advantages over the other conventional optical QPSK signal detection methods. First, thi

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Jørgensen, J. S., and E. Y. Sidky. "How little data is enough? Phase-diagram analysis of sparsity-regularized X-ray computed tomography." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2043 (2015): 20140387. http://dx.doi.org/10.1098/rsta.2014.0387.

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We introduce phase-diagram analysis, a standard tool in compressed sensing (CS), to the X-ray computed tomography (CT) community as a systematic method for determining how few projections suffice for accurate sparsity-regularized reconstruction. In CS, a phase diagram is a convenient way to study and express certain theoretical relations between sparsity and sufficient sampling. We adapt phase-diagram analysis for empirical use in X-ray CT for which the same theoretical results do not hold. We demonstrate in three case studies the potential of phase-diagram analysis for providing quantitative

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Ahmed, Mohammed, Cyrus Daneshvar, and David Breen. "Routine neck ultrasound by respiratory physicians in the diagnosis and staging of patients with lung cancer and mediastinal lymphadenopathy: a prospective pilot study." ERJ Open Research 6, no. 1 (2020): 00180–2019. http://dx.doi.org/10.1183/23120541.00180-2019.

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IntroductionCervical lymphadenopathy in lung cancer indicates advanced disease. The presence of mediastinal lymphadenopathy is commonly associated with involvement of neck lymph nodes and some studies suggest routine neck ultrasound (NUS) in this group of patients. We conducted a two-phase study looking at training a respiratory physician to perform ultrasound-guided neck lymph node aspiration in patients with suspected lung cancer.MethodsIn the first phase of the study, one of the authors underwent training in NUS according to predetermined criteria. The adequacy of sampling was prospectively

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