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Numerical simulation and experimental research on the wheel brush sampling process of an asteroid sampler

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0732-0

Abstract: is established and a simulation and experimental verification of the sampling process are conducted.process.process.higher, and the driving torque required for the sampling wheel brush is greater.Moreover, a numerical simulation analysis of the sampling process of the wheel brush sampler in a microgravity

Keywords： asteroid sampling     wheel brush sampler     discrete element method     parameter calibration     experimental    

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Investigation on sampling artifacts of particle associated PAHs using ozone denuder systems

Kai LIU, Fengkui DUAN, Kebin HE, Yongliang MA, Yuan CHENG

Frontiers of Environmental Science & Engineering 2014, Volume 8, Issue 2,   Pages 284-292 doi: 10.1007/s11783-013-0555-7

Abstract: process, leading to an underestimation of ambient PAH concentrations.The goal of this work was to investigate particle associated PAHs sampling artifacts caused by ozonecarbon ozone denuder, the other being set as conventional sampling system.Ambient temperature was founded to have influences on PAHs sampling artifacts.High temperature can increase loss of particle associated PAHs during sampling.

Keywords： particle associated polycyclic aromatic hydrocarbons (PAHs)     ozone     denuder     sampling artifacts    

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A sampling method based on URL clustering for fast web accessibility evaluation

Meng-ni ZHANG,Can WANG,Jia-jun BU,Zhi YU,Yu ZHOU,Chun CHEN

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 6,   Pages 449-456 doi: 10.1631/FITEE.1400377

Abstract: When evaluating the accessibility of a large website, we rely on sampling methods to reduce the costTo improve sampling quality, stratified sampling methods first cluster web pages in a site and then drawIn existing stratified sampling methods, however, all the pages in a website need to be analyzed forTo address this issue, we propose a novel page sampling method based on URL clustering for web accessibilityUsing only the URL information for stratified page sampling, URLSamp can efficiently scale to large websites

Keywords： Page sampling     URL clustering     Web accessibility evaluation    

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Dilution sampling and analysis of particulate matter in biomass-derived syngas

Xiaoliang WANG, Curtis ROBBINS, S. Kent HOEKMAN, Judith C. CHOW, John G. WATSON, Dennis SCHUETZLE

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 3,   Pages 320-330 doi: 10.1007/s11783-011-0347-x

Abstract: A dilution sampling system is demonstrated to quantify PM in syngas generated from two gasification plantsThe dilution sampling system enabled reliable measurements over a wide range of concentrations: the useallowed measurement at very low concentrations (~1 μg·m ), while the flexibility of dilution minimized sampling

Keywords： dilution source sampling     syngas characterization     biomass gasification     ultrafine particles    

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Unified methodology for site-characterization and sampling of highway runoff

Jy S. WU, Craig J. ALLAN,

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 1,   Pages 47-58 doi: 10.1007/s11783-010-0003-x

Abstract: operational guidance is suggested for implementing highway-runoff monitoring programs that are subject to sampling

Keywords： highway runoff     pollutant loads     regression models     non-point source pollution     storm water permit    

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Uncertainty propagation in dynamics of composite plates: A semi-analytical non-sampling-based approach

Mahdi FAKOOR, Hadi PARVIZ

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1359-1371 doi: 10.1007/s11709-020-0658-8

Abstract: In this study, the influences of spatially varying stochastic properties on free vibration analysis of composite plates were investigated via development of a new approach named the deterministic-stochastic Galerkin-based semi-analytical method. The material properties including tensile modulus, shear modulus, and density of the plate were assumed to be spatially varying and uncertain. Gaussian fields with first-order Markov kernels were utilized to define the aforementioned material properties. The stochastic fields were decomposed via application of the Karhunen-Loeve theorem. A first-order shear deformation theory was assumed, following which the displacement field was defined using admissible trigonometric modes to derive the potential and kinetic energies. The stochastic equations of motion of the plate were obtained using the variational principle. The deterministic-stochastic Galerkin-based method was utilized to find the probability space of natural frequencies, and the corresponding mode shapes of the plate were determined using a polynomial chaos approach. The proposed method significantly reduced the size of the mathematical models of the structure, which is very useful for enhancing the computational efficiency of stochastic simulations. The methodology was verified using a stochastic finite element method and the available results in literature. The sensitivity of natural frequencies and corresponding mode shapes due to the uncertainty of material properties was investigated, and the results indicated that the higher-order modes are more sensitive to uncertainty propagation in spatially varying properties.

Keywords： composite plate     spatially varying stochastic properties     Galerkin method     polynomial chaos approach     semi-analytical approach    

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Data recovery with sub-Nyquist sampling: fundamental limit and a detection algorithm

Xiqian Luo, Zhaoyang Zhang,ning_ming@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 2,   Pages 141-286 doi: 10.1631/FITEE.1900320

Abstract: general bandlimited signal with no information loss, the sub-Nyquist rate may also be sufficient for samplingFirst, the minimum normalized Euclidean distances for the two sampling schemes are calculated which indicatethe performance upper bounds of each sampling scheme.rates (BERs) with different schemes are compared with both their theoretical limits and their Nyquist sampling

Keywords： Nyquist-Shannon sampling theorem     Sub-Nyquist sampling     Minimum Euclidean distance     Under-determined    

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δN-stable isotope analysis of NH: An overview on analytical measurements, source sampling and its source

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1414-6

Abstract:

• Challenges in sampling of NH3 sources for Keywords： Aerosol ammonium     Atmospheric gaseous ammonia     Isotope fingerprinting     Isotope-based source apportionment     Ammonia gas-to-particle conversion    

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A case study on sample average approximation method for stochastic supply chain network design problem

Yuan WANG, Ruyan SHOU, Loo Hay LEE, Ek Peng CHEW

Frontiers of Engineering Management 2017, Volume 4, Issue 3,   Pages 338-347 doi: 10.15302/J-FEM-2017032

Abstract: branch-and-fix coordination, sample average approximation (SAA) with Bayesian bootstrap, and Latin hypercube sampling

Keywords： supply chain network     stochastic demand     sampling average approximation     Bayesian bootstrap     Latin hypercubesampling    

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Passive source localization using importance sampling based on TOA and FOA measurements Article

Rui-rui LIU, Yun-long WANG, Jie-xin YIN, Ding WANG, Ying WU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 8,   Pages 1167-1179 doi: 10.1631/FITEE.1601657

Abstract: In this paper, we use the Pincus theorem and Monte Carlo importance sampling (MCIS) to achieve an approximatedensity function (PDF) of Gaussian distribution, which is called an important function for efficient samplingThis process greatly reduces the amount of calculation, but an initial solution estimation is requiredHowever, the MCIS method is robust to this prior knowledge for point sampling and correction of importance

Keywords： Passive source localization     Time of arrival (TOA)     Frequency of arrival (FOA)     Monte Carlo importance sampling    

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Embedding expert demonstrations into clustering buffer for effective deep reinforcement learning Research Article

Shihmin WANG, Binqi ZHAO, Zhengfeng ZHANG, Junping ZHANG, Jian PU

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 11,   Pages 1541-1556 doi: 10.1631/FITEE.2300084

Abstract: different types of posterior distributions, we focus on the policy and propose an efficient selective samplingcontinuous locomotion environments demonstrate superior performance and faster convergence of selective sampling

Keywords： Reinforcement learning     Sample efficiency     Sampling process     Clustering methods     Autonomous driving    

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Mercury source zone identification using soil vapor sampling and analysis

David WATSON,Carrie MILLER,Brian LESTER,Kenneth LOWE,George SOUTHWORTH,Mary Anna BOGLE,Liyuan LIANG,Eric PIERCE

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 4,   Pages 596-604 doi: 10.1007/s11783-014-0709-2

Abstract: elemental mercury (Hg(0)) in the subsurface are needed to reduce uncertainties in the decision-making processconducted field tests at the Y-12 National Security Complex in Oak Ridge, Tennessee, USA, to determine if samplingTime-series sampling showed that Hg vapor concentrations were fairly stable over time, suggesting thatthe vapor phase Hg(0) was not being depleted and that sampling results were not sensitive to the soilWe conclude from our studies that soil gas sampling and analysis can be conducted rapidly and inexpensively

Keywords： push probe     spill     characterization     mapping     gas    

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Classification of contaminants and treatability evaluation of domestic wastewater

WANG Xiaochang, JIN Pengkang, ZHAO Hongmei, MENG Lingba

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 57-62 doi: 10.1007/s11783-007-0011-7

Abstract: Long-term sampling and analysis were conducted in a domestic wastewater treatment plant for the investigationA treatability evaluation diagram was proposed for a rational selection of wastewater treatment process

Keywords： Long-term sampling     selection     accordance     wastewater treatment     coagulation/sedimentation    

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Optimized determination of airborne tetracycline resistance genes in laboratory atmosphere

Lu Song, Can Wang, Yizhu Wang

Frontiers of Environmental Science & Engineering 2020, Volume 14, Issue 6, doi: 10.1007/s11783-020-1274-5

Abstract: Abstract • Sampling parameters with high efficiency was determined. • Operational process to detectAn optimized sampling method was proposed that the buffer wash was 1.4 µL/mm2 and the ultrasonication

Keywords： Airborne tetracycline resistance genes     Filter sampling     Capture loading     Membrane pretreatment     Indoor laboratory    

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High-resolution spectral video acquisition Review

Lin-sen CHEN, Tao YUE, Xun CAO, Zhan MA, David J. BRADY

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 9,   Pages 1250-1260 doi: 10.1631/FITEE.1700098

Abstract: Compared with conventional cameras, spectral imagers providemany more features in the spectral domain. They have been used invarious fields such as material identification, remote sensing, precisionagriculture, and surveillance. Traditional imaging spectrometers usegenerally scanning systems. They cannot meet the demands of dynamicscenarios. This limits the practical applications for spectral imaging.Recently, with the rapid development in computational photographytheory and semiconductor techniques, spectral video acquisition hasbecome feasible. This paper aims to offer a review of the state-of-the-artspectral imaging technologies, especially those capable of capturingspectral videos. Finally, we evaluate the performances of the existingspectral acquisition systems and discuss the trends for future work.

Keywords： Multispectral/hyperspectral video acquisition     Snapshot     Under-sampling and reconstruction    

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Title Author Date Type Operation

Numerical simulation and experimental research on the wheel brush sampling process of an asteroid sampler

Journal Article

Investigation on sampling artifacts of particle associated PAHs using ozone denuder systems

Kai LIU, Fengkui DUAN, Kebin HE, Yongliang MA, Yuan CHENG

Journal Article

A sampling method based on URL clustering for fast web accessibility evaluation

Meng-ni ZHANG,Can WANG,Jia-jun BU,Zhi YU,Yu ZHOU,Chun CHEN

Journal Article

Dilution sampling and analysis of particulate matter in biomass-derived syngas

Xiaoliang WANG, Curtis ROBBINS, S. Kent HOEKMAN, Judith C. CHOW, John G. WATSON, Dennis SCHUETZLE

Journal Article

Unified methodology for site-characterization and sampling of highway runoff

Jy S. WU, Craig J. ALLAN,

Journal Article

Uncertainty propagation in dynamics of composite plates: A semi-analytical non-sampling-based approach

Mahdi FAKOOR, Hadi PARVIZ

Journal Article

Data recovery with sub-Nyquist sampling: fundamental limit and a detection algorithm

Xiqian Luo, Zhaoyang Zhang,ning_ming@zju.edu.cn

Journal Article

δN-stable isotope analysis of NH: An overview on analytical measurements, source sampling and its source

Journal Article

A case study on sample average approximation method for stochastic supply chain network design problem

Yuan WANG, Ruyan SHOU, Loo Hay LEE, Ek Peng CHEW

Journal Article

Passive source localization using importance sampling based on TOA and FOA measurements

Rui-rui LIU, Yun-long WANG, Jie-xin YIN, Ding WANG, Ying WU

Journal Article

Embedding expert demonstrations into clustering buffer for effective deep reinforcement learning

Shihmin WANG, Binqi ZHAO, Zhengfeng ZHANG, Junping ZHANG, Jian PU

Journal Article

Mercury source zone identification using soil vapor sampling and analysis

David WATSON,Carrie MILLER,Brian LESTER,Kenneth LOWE,George SOUTHWORTH,Mary Anna BOGLE,Liyuan LIANG,Eric PIERCE

Journal Article

Classification of contaminants and treatability evaluation of domestic wastewater

WANG Xiaochang, JIN Pengkang, ZHAO Hongmei, MENG Lingba

Journal Article

Optimized determination of airborne tetracycline resistance genes in laboratory atmosphere

Lu Song, Can Wang, Yizhu Wang

Journal Article

High-resolution spectral video acquisition

Lin-sen CHEN, Tao YUE, Xun CAO, Zhan MA, David J. BRADY

Journal Article