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Variation of size-segregated particle number concentrations in winter Beijing

Ying Zhou, Lubna Dada, Yiliang Liu, Yueyun Fu, Juha Kangasluoma, Tommy Chan, Chao Yan, Biwu Chu, Kaspar R. Daellenbach, Federico Bianchi, Tom Kokkonen, Yongchun Liu (+6 others)
2019 Atmospheric Chemistry and Physics Discussions  
In addition, we correlated the different modes with concentrations of trace gases and other parameters measured at our station.  ...  Here we aim to explain the concentration variation in the observed modes by relating them to potential aerosol sources as well as to understand the connection between the modes.  ...  Figure 9 . 9 Correlations between particle number concentration in neighboring modes.778The time resolution of the data points are 1 hour. ). NOx and CO had similar diurnal patterns.  ... 
doi:10.5194/acp-2019-60 fatcat:gxtzijxoyrbm3fdi4akeivxyh4

Variation of size-segregated particle number concentrations in wintertime Beijing

Ying Zhou, Lubna Dada, Yiliang Liu, Yueyun Fu, Juha Kangasluoma, Tommy Chan, Chao Yan, Biwu Chu, Kaspar R. Daellenbach, Federico Bianchi, Tom V. Kokkonen, Yongchun Liu (+6 others)
2020 Atmospheric Chemistry and Physics  
In addition, we correlated the particle number concentrations in different modes with concentrations of trace gases and other parameters measured at our station.  ...  Here we focus on explaining the concentration variations in the observed particle modes, by relating them to the potential aerosol sources and sinks, and on understanding the connections between these  ...  Connection with CO CO has some similar sources as NO x , such as traffic.  ... 
doi:10.5194/acp-20-1201-2020 fatcat:jkdw2b44z5farijik6olwgdyt4

Source-receptor relationships for airborne measurements of CO2, CO and O3 above Siberia: a cluster-based approach

J.-D. Paris, A. Stohl, P. Ciais, P. Nédélec, B. D. Belan, M. Yu. Arshinov, M. Ramonet
2010 Atmospheric Chemistry and Physics  
time -into potential source regions of the footprint emission sensitivities obtained from the model calculations.  ...  We analysed results of three intensive aircraft campaigns above Siberia (April and September 2006, August 2007) with a total of ∼70 h of continuous CO 2 , CO and O 3 measurements.  ...  Pearson correlation coefficients were calculated after excluding data associated to residence time <100 s. This data selection rejects less than 1% of the data range.  ... 
doi:10.5194/acp-10-1671-2010 fatcat:a6fkh6gxing2ffgqwruxy6ftzy

First Evidences of Methyl Chloride (CH3Cl) Transport from the Northern Italy Boundary Layer during Summer 2017

Paolo Cristofanelli, Jgor Arduini, Francescopiero Calzolari, Umberto Giostra, Paolo Bonasoni, Michela Maione
2020 Atmosphere  
The temporal correlation analysis with specific tracers of anthropogenic activity (traffic, industry, petrochemical industry) together with bivariate analysis as a function of local wind regime suggested  ...  While the atmospheric CH3Cl emissions are predominantly caused by natural sources on the global budget, significant uncertainties still remain for the anthropogenic CH3Cl emission strengths.  ...  We acknowledge the AGAGE Science Team and SIO (Scripps Institution of Oceanography) for providing the calibration standards used at CMN as well as Jungfraujoch CH3Cl data for summer 2017 (especially M.K  ... 
doi:10.3390/atmos11030238 fatcat:v4lctwht5rgczc3sqopzrnxfx4

Visual Exploration of Energy Use in EU 28: Dynamics, Patterns, Policies

George Halkos, Kyriaki Tsilika
2021 Energies  
The paper places emphasis on primary energy resources, their covariation, and their correlation with socioeconomic factors and aims to provide a systematic analysis of their development over time.  ...  We present an approach that addresses the informatics challenges based on the integration of visualization software, data integration, and cluster analysis.  ...  Energy Use Associated with CO 2 Emissions Let us now examine in more detail the relationship between the values of energy variables and CO 2 emissions over time.  ... 
doi:10.3390/en14227532 fatcat:fapuj3575bfdhgzh4kgapdaste

Microseismic Monitoring and Interpretation of Injection Data from the in Salah CO2 Storage Site (Krechba), Algeria

Volker Oye, Eyvind Aker, Thomas M. Daley, Daniela Kühn, Bahman Bohloli, Valeri Korneev
2013 Energy Procedia  
Clusters with shorter S-P wave differential travel times clearly correlate with the CO 2 injection at KB502, whereas events with larger S-P wave times do not.  ...  Microseismic data analysis together with interpretation of injection data at the In Salah CO 2 storage site provides a valuable tool for improved understanding of the subsurface injection and storage processes  ...  The authors like to acknowledge In Salah Gas Joint Venture and their partners BP, Statoil, and Sonatrach for providing field data and valuable discussions. We also thank K. Iranpour, P. Zhao and K.  ... 
doi:10.1016/j.egypro.2013.06.321 fatcat:4mzyhjuuafggxkscoiumwfjhym

Impact of meteorological conditions on airborne fine particle composition and secondary pollutant characteristics in urban area during winter-time

Klaus Schäfer, Michael Elsasser, Jose M. Arteaga-Salas, Jianwei Gu, Mike Pitz, Jürgen Schnelle-Kreis, Josef Cyrys, Stefan Emeis, Andre S.H. Prévôt, Ralf Zimmermann
2016 Meteorologische Zeitschrift  
In each phase hierarchical clustering analysis with the Ward method was applied to the correlations of air pollutants, PM components, PM source contributions and PSD modes and correlations of these data  ...  These daily variation data analyses provide new, detailed meteorological influences on air pollutant data with the focus on fine particle composition and secondary pollutant characteristics and can explain  ...  Hoffmann (KIT/IMK-IFU) for effective cooperation during the measurement campaign, Christoph Münkel (Vaisala GmbH, Hamburg, Germany) for cooperation within the frame of MLH determination from ceilometer data  ... 
doi:10.1127/metz/2016/0684 fatcat:3kcomnn7z5aftj6nu7frttsvgi

Mining a Web Citation Database for author co-citation analysis

Yulan He, Siu Cheung Hui
2002 Information Processing & Management  
Author co-citation analysis (ACA) has been widely used in bibliometrics as an analytical method in analyzing the intellectual structure of science studies.  ...  The mining process uses agglomerative hierarchical clustering (AHC) as the mining technique for author clustering and multidimensional scaling (MDS) for displaying author cluster maps.  ...  The raw co-citation matrix is then converted into the correlation matrix by substituting the author co-citation frequency with Pearson's correlation coefficient.  ... 
doi:10.1016/s0306-4573(01)00046-2 fatcat:i3cvhhomajajppzaow3s6m4xv4

Big Data Visualization by MapReduce for Discovering the Relationship Between Pollutant Gases

Yas A. Alsultanny
2021 Journal Port Science Research  
The ozone has a moderate negative correlation of value -0.622 with nitrogen dioxide, and weak negative correlation of value -0.248 with carbon monoxide, and -0.155 with carbon dioxide.  ...  Ozone has approximately no correlation of value .060 with silver dioxide. The carbon monoxide has moderate positive correlation of value 0.364 with carbon dioxide.  ...  The second row of charts show NO2 has no relation with SO2, while has a positive relation with CO2 and CO, this indicate the source of NO2, CO2 and CO 2 are the same.  ... 
doi:10.36371/port.2021.2.3 fatcat:okaqgkvewrew7pyefb253no6ja

An Urban System Optimization Model Based on CO2 Sequestration Index: A Big Data Analytics Approach

Vasile Dogaru, Claudiu Brandas, Marian Cristescu
2019 Sustainability  
The analysis of large volumes of data provided by local sensors and databases requires big data analytics.  ...  The model is based on a tree inventory for traffic area and car flow using Roegenian processes with borders.  ...  Quarterly or at least two times per year, a progressive differentiated tax, established in relation with the mileage achieved, will be charged.  ... 
doi:10.3390/su11184821 fatcat:57p76pfjyfdorlvumnuc72sa2q

The link between gas and stars in the S254-S258 star-forming region [article]

D. A. Ladeyschikov, M. S. Kirsanova, A. M. Sobolev, M. Thomasson, V. Ossenkopf-Okada, M. Juvela, S. A. Khaibrakhmanov, E. A. Popova
2021 arXiv   pre-print
The direct correlation analysis between these maps was used together with the wavelet-based spatial correlation analysis.  ...  We compared the large-scale CO, HCO^+, near-IR extinction, and far-IR Herschel maps with the density of YSOs of the different evolutionary Classes.  ...  K. of correlation analysis in Sec- This work use data products from UKIRT Infrared Deep Sky Survey (UKIDSS) archive. The UKIDSS project is defined in Lawrence  ... 
arXiv:2106.12789v1 fatcat:hgjgndxblregziap4mcbb2jhhq

Temporal Changes of Shallow Seismic Velocity Around the Karadere-Düzce Branch of the North Anatolian Fault and Strong Ground Motion

Zhigang Peng, Yehuda Ben-Zion
2006 Pure and Applied Geophysics  
The decay rates of the repeating events in individual clusters are compatible with the Omori's law for the decay rate of regional aftershocks.  ...  A strong correlation between the co-seismic delays and intensities of the strong ground motion generated by the Du¨zce main shock implies that the radiated seismic waves produced the velocity reductions  ...  Acknowledgments We are grateful to John Armbruster, David Okaya, Naside Ozer and Nano Seeber for essential help with the fieldwork, and to PASSCAL for providing the equipment and technical support for  ... 
doi:10.1007/s00024-005-0034-6 fatcat:n47cloxqkrao7muugdbgwivgfi

An approach to discover and recommend cross‐domain bridge‐keywords in document banks

Yu‐Min Su, Ping‐Yu Hsu, Ning‐Yao Pai
2010 Electronic library  
A clustering method is performed with the correlation matrix computed from the frequency counts of the CKPs, for clustering the complete keyword sets.  ...  Purpose -The co-word analysis method is commonly used to cluster-related keywords into the same keyword domain.  ...  With the keyword co-word analysis of BIRS, the keyword co-occurrence frequency matrix is created by counting the number of times two keywords occur together in the bibliography of the same papers.  ... 
doi:10.1108/02640471011081951 fatcat:tjdorcmp2zhqldahqcayuw3kgi

Cortical surface alignment in multi-subject spatiotemporal independent EEG source imaging

Arthur C. Tsai, Tzyy-Ping Jung, Vincent S.C. Chien, Alexander N. Savostyanov, Scott Makeig
2014 NeuroImage  
theta rhythm, and right-inferior frontal responses, the EMSICA clusters exhibiting more tightly correlated source areas and time-frequency features.  ...  its scalp map and clusters similar sources across subjects (Makeig et al., 2002) .  ...  Acknowledgments 29 The authors are indebted to Professor Chia-Ying Lee for helping develop strategies for successful EEG data collection and to Alejandro Ojeda Gonzalez for helpful discussions on the  ... 
doi:10.1016/j.neuroimage.2013.09.045 pmid:24113626 fatcat:vgxkol4zrvdwnhlfor7qscgt3i

Gaseous pollutants in Beijing urban area during the heating period 2007–2008: variability, sources, meteorological and chemical impacts

W. Lin, X. Xu, B. Ge, X. Liu
2011 Atmospheric Chemistry and Physics Discussions  
The concentrations of SO 2 , CO, and NO x are strongly correlated among each other, indicating that they are emitted by some common sources.  ...  Data of O 3 , NO z , and NO x /NO y indicate that photochemistry can take place in Beijing even in the cold winter period.  ...  These two types of sources are the major sources of NO y . Therefore, NO y may correlate well with both SO 2 and CO.  ... 
doi:10.5194/acpd-11-6919-2011 fatcat:luzwjuxg35ambkxnyfvgusw2jq
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