scholarly journals Polarizability-Dependent Sorting of Microparticles Using Continuous-Flow Dielectrophoretic Chromatography with a Frequency Modulation Method

Micromachines ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 38 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon that is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here, we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap-and-release cycles of the particles. A chromatographic separation of different particle sizes revealed the voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles, but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

scholarly journals Polarizability-dependent Sorting of Microparticles Using Continuous-flow Dielectrophoretic Chromatography with a Frequency Modulation Method

2019 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon which is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap and release cycles of the particles. A chromatographic separation of different particle sizes revealed a voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

scholarly journals Polarizability-dependent Sorting of Microparticles Using Continuous-flow Dielectrophoretic Chromatography with a Frequency Modulation Method

2019 ◽  
Author(s):  
Jasper Giesler ◽  
Georg R. Pesch ◽  
Laura Weirauch ◽  
Marc-Peter Schmidt ◽  
Jorg Thöming ◽  
...  
Keyword(s):  
Chromatographic Separation ◽  
Continuous Flow ◽  
Research Field ◽  
Modulation Method ◽  
Particle Sizes ◽  
Frequency Bandwidth ◽  
New Approach ◽  
Particle Properties ◽  
Multiple Particle ◽  
Multiple Trap And Release

The separation of microparticles with respect to different properties such as size and material is a research field of great interest. Dielectrophoresis, a phenomenon which is capable of addressing multiple particle properties at once, can be used to perform a chromatographic separation. However, the selectivity of current dielectrophoretic particle chromatography (DPC) techniques is limited. Here we show a new approach for DPC based on differences in the dielectrophoretic mobilities and the crossover frequencies of polystyrene particles. Both differences are addressed by modulating the frequency of the electric field to generate positive and negative dielectrophoretic movement to achieve multiple trap and release cycles of the particles. A chromatographic separation of different particle sizes revealed a voltage dependency of this method. Additionally, we showed the frequency bandwidth influence on separation using one example. The DPC method developed was tested with model particles but offers possibilities to separate a broad range of plastic and metal microparticles or cells and to overcome currently existing limitations in selectivity.

scholarly journals On microphysical processes of noctilucent clouds (NLC): observations and modeling of mean and width of the particle size-distribution

2010 ◽  
Vol 10 (2) ◽  
pp. 3605-3625
Author(s):  
G. Baumgarten ◽  
J. Fiedler ◽  
M. Rapp
Keyword(s):  
Particle Size ◽  
Linear Relationship ◽  
Size Distribution ◽  
Eddy Diffusion ◽  
Particle Sizes ◽  
Noctilucent Clouds ◽  
Atmospheric Variability ◽  
Distribution Width ◽  
Particle Properties ◽  
Microphysical Processes

Abstract. Noctilucent clouds (NLC) in the polar summer mesopause region have been observed in Norway (69° N, 16° E) between 1998 and 2009 by 3-color lidar technique. Assuming a mono-modal Gaussian size distribution we deduce mean and width of the particle sizes throughout the clouds. We observe a quasi linear relationship between distribution width and mean of the particle size at the top of the clouds and a deviation from this behavior for particle sizes larger than 40 nm, most often in the lower part of the layer. The vertically integrated particle properties show that 65% of the data follows the linear relationship with a slope of 0.42±0.02. For the vertically resolved particle properties (Δz=0.15 km) the slope is smaller and only 0.39±0.03. We compare our observations to microphysical modeling of noctilucent clouds and find that the distribution width depends on turbulence, the time that turbulence can act (cloud age), and the sampling volume/time (atmospheric variability). The model results nicely reproduce the measurements and show that the observed slope can be explained by eddy diffusion profiles as observed from rocket measurements.

Privacy Perspective from Utilitarianism and Metaphysical Theories

2003 ◽  
pp. 267-278
Author(s):  
Hasan A. Abbas ◽  
Salah M. Al-Fadhly
Keyword(s):  
Social Studies ◽  
Real Life ◽  
Research Field ◽  
The Internet ◽  
Ethical Theories ◽  
Philosophical Perspective ◽  
New Approach ◽  
Different Levels

The Internet is a hot issue nowadays because of its important role at different levels. The topic of privacy is a debatable issue: we read in the research field scholars for and against applying this concept in real life and how to deal with it. Most researchers mainly focus on this subject from a social studies perspective. This chapter takes a new approach and discusses this issue from a philosophical perspective where we use two ethical theories (Mill & Kant) to raise the important relevant points regarding this subject.

scholarly journals Potential Risk to Pollinators from Nanotechnology-Based Pesticides

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4458 ◽  
Author(s):  
Louisa A. Hooven ◽  
Priyadarshini Chakrabarti ◽  
Bryan J. Harper ◽  
Ramesh R. Sagili ◽  
Stacey L. Harper
Keyword(s):  
Potential Risk ◽  
Honey Bees ◽  
Environmental Contaminants ◽  
Particle Sizes ◽  
Multiple Factors ◽  
Pesticide Formulations ◽  
Insect Pollinators ◽  
Global Concern ◽  
Structural Adaptations ◽  
Multiple Particle

The decline in populations of insect pollinators is a global concern. While multiple factors are implicated, there is uncertainty surrounding the contribution of certain groups of pesticides to losses in wild and managed bees. Nanotechnology-based pesticides (NBPs) are formulations based on multiple particle sizes and types. By packaging active ingredients in engineered particles, NBPs offer many benefits and novel functions, but may also exhibit different properties in the environment when compared with older pesticide formulations. These new properties raise questions about the environmental disposition and fate of NBPs and their exposure to pollinators. Pollinators such as honey bees have evolved structural adaptations to collect pollen, but also inadvertently gather other types of environmental particles which may accumulate in hive materials. Knowledge of the interaction between pollinators, NBPs, and other types of particles is needed to better understand their exposure to pesticides, and essential for characterizing risk from diverse environmental contaminants. The present review discusses the properties, benefits and types of nanotechnology-based pesticides, the propensity of bees to collect such particles and potential impacts on bee pollinators.

Reaction Calorimetry in Continuous Flow Mode: A New Approach for the Thermal Characterization of High Energetic and Fast Reactions

2020 ◽  
Vol 24 (10) ◽  
pp. 2004-2016
Author(s):  
Frederik Mortzfeld ◽  
Jutta Polenk ◽  
Bertrand Guelat ◽  
Francesco Venturoni ◽  
Berthold Schenkel ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Thermal Characterization ◽  
Reaction Calorimetry ◽  
Flow Mode ◽  
New Approach ◽  
Fast Reactions ◽  
Mode A

Research on Modulation Method and Characteristic Analysis of Faraday DC Optical Measurement System

2012 ◽  
Vol 614-615 ◽  
pp. 1289-1294
Author(s):  
Lu Meng ◽  
Rui Dong ◽  
Qing Fu Xiong ◽  
Qian Wang
Keyword(s):  
Measurement System ◽  
Optical Measurement ◽  
Current Transformer ◽  
Research Field ◽  
Modulation Method ◽  
Measured Signal ◽  
Frequency Noise ◽  
Signal Source ◽  
Characteristic Analysis ◽  
Optical Measurement System

The optical current transformer is an important content in smart grid research field. When the Faraday DC optical measurement system was used in DC current measurement, the low frequency noise caused by photo detector and measured signal were overlapped, which makes the measuring accuracy decrease. To solve this problem, the noise of photo detector is analyzed. Then, the frequency modulation is proposed for spectrum shifting. Furthermore, the principle of modulation method is deduced in formula, and the characteristics of deferent frequency are also analyzed. On this base, modulation signal source is designed. With LabVIEW program, the signal from modulation source is acquainted and analyzed. The results show that this modulation method can realize spectrum shifting and the designed signal source is able to generate waveform needed.

Predicting Protein Subcellular Localization Using the Algorithm of Increment of Diversity Combined with Weighted K-Nearest Neighbor

2013 ◽  
Vol 765-767 ◽  
pp. 3099-3103 ◽  
Author(s):  
Ze Yue Wu ◽  
Yue Hui Chen
Keyword(s):  
Subcellular Localization ◽  
Cross Validation ◽  
Nearest Neighbor ◽  
Research Field ◽  
Important Research ◽  
Protein Subcellular Localization ◽  
K Nearest Neighbor ◽  
Prediction Ability ◽  
New Approach ◽  
Increment Of Diversity

Protein subcellular localization is an important research field of bioinformatics. In this paper, we use the algorithm of the increment of diversity combined with weighted K nearest neighbor to predict protein in SNL6 which has six subcelluar localizations and SNL9 which has nine subcelluar localizations. We use the increment of diversity to extract diversity finite coefficient as new features of proteins. And the basic classifier is weighted K-nearest neighbor. The prediction ability was evaluated by 5-jackknife cross-validation. Its predicted result is 83.3% for SNL6 and 87.6 % for SNL9. By comparing its results with other methods, it indicates the new approach is feasible and effective.

scholarly journals Effects of different thermal sintering temperatures on pattern resistivity of printed silver ink with multiple particle sizes

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115116
Author(s):  
Zhiheng Yu ◽  
Fengli Huang ◽  
Tiancheng Zhang ◽  
Chengli Tang ◽  
Xihua Cui ◽  
...  
Keyword(s):  
Particle Sizes ◽  
Silver Ink ◽  
Thermal Sintering ◽  
Multiple Particle
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