Article
Environmental Studies
Shengming Chen, Ahmed Bouteska, Taimur Sharif, Mohammad Zoynul Abedin
Summary: The aim of this paper is to analyze the impact of the recent Russia-Ukraine war on the volatility dynamics of the natural gas market. The study uses the daily return data of the S&P GSCI natural gas index and applies the Volatility Ratio to assess the behavior of the volatility-of-volatility in different time horizons. The empirical findings reveal a rapid decrease in the volatility-of-volatility before the war and a longer period of decrease in the S&P GSCI natural gas index. The study also suggests that periods of uncertainties trigger investors' intent to make informed decisions and formulate superior strategies.
Article
Engineering, Environmental
Xueyan Yang, Siman Ren, Yuwei Wang, Gan Yang, Yueyang Li, Chuang Li, Lihong Wang, Lei Yao, Lin Wang
Summary: In this study, a Long Time-of-Flight Chemical Ionization Mass Spectrometry (LToF-CIMS) combined with a Filter Inlet for Gases and AEROsols (FIGAERO) was used to analyze ambient particulate samples collected in Shanghai in the summer of 2021. The molecular formulas and thermograms of organic compounds were investigated, and the saturation vapor pressures of low- and semivolatile components of ambient organic aerosols were estimated. A hierarchical cluster analysis and classification were conducted to classify all compounds into multiple groups based on similarity calculation. Parametrizations between volatility and elemental composition were derived for each group, and relationships between the parameters and the mean O:C were established to achieve a volatility-molecular formula parametrization with the O:C as a key input. The study showed a better predictive performance for low-volatile organic compounds compared to previous molecular formula-based methods.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Zhenyu Zhao, Hong Li, Guanlun Sun, Xinhui Tang, Haoyu Wu, Xin Gao
Summary: A novel dimensionless number ZMW was derived to study the effect of microwave irradiation on relative volatility change. A quantitative correlation was established between MIRVC and ZMW, and used to predict data from previous studies.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Marine
Shigang Qin, Deshun Liu
Summary: This paper proposes a normal distribution-modeling method based on relative volatility to address the stochastic fluctuations in wind speed and wind power curve modeling. The method extracts wind-speed variation patterns from onsite SCADA data and establishes a wind-power volatility-curve model. The correlation between wind-speed relative volatility and power relative volatility is analyzed, providing a basis for evaluating the efficiency of wind turbines.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Zhengong Tong, Jun Li, Longwang Fu, Zheshuai Wu, Cilong Zhong
Summary: The pilot-scale test demonstrated that an appropriate sludge water reflux ratio can ensure the safety of effluent while enhancing the coagulation effect. Additionally, sludge water reflux can increase the compactness of floc and improve the treatment efficiency of low-temperature low-turbidity water.
FRESENIUS ENVIRONMENTAL BULLETIN
(2021)
Article
Economics
Serda Selin Ozturk, Riza Demirer, Rangan Gupta
Summary: This study analyzes the impact of climate uncertainty on carbon emissions prices using novel measures of uncertainty. The results show that physical climate risks play a dominant role in price fluctuations. Additionally, the study provides interesting hedging strategies for achieving decarbonization goals in investment positions.
Article
Chemistry, Physical
Li Xu, Narcisse T. Tsona, Lin Du
Summary: This study reveals that high relative humidity enhances the contribution of SO2 to the formation of OSs, particularly HOOSs, during monoterpene ozonolysis in the atmosphere. The interaction between SO2 and ROOHs under high humidity conditions promotes the formation of HOOSs, leading to changes in SOA yield. Additionally, variations in particle acidity and liquid water content also impact SOA formation.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Construction & Building Technology
Shengying Zhao, Xinchun Guan, Guofu Qiao, Jingjing Lyu
Summary: This paper presents a model to calculate the long-term compressive strength of SAP-modified concrete compared to concrete without SAP. The model takes into account the influence of paste strength and SAP void content. Results show that the addition of internal curing water can enhance the strength of concrete, but there exists a critical water-to-binder ratio above which the addition of water reduces strength. The model is validated by experimental results and is applicable to various types of concrete.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Psychology, Clinical
Chittaranjan Andrade
Summary: Categorical outcome analyses in RCTs and observational studies are commonly presented as RRs and ORs. This article explains how these measures can be misconstrued, leading to incorrect conclusions.
JOURNAL OF CLINICAL PSYCHIATRY
(2023)
Article
Forestry
Mo Zhou
Summary: This study found that the steady-state ratio between the prices of two types of timber depends on their relative quality and ease of substitution in production. The variability of relative input prices is related to shocks in tree growth and demand for the output, and is negatively correlated with ease of substitution.
CANADIAN JOURNAL OF FOREST RESEARCH
(2021)
Article
Computer Science, Artificial Intelligence
Murat Okkalioglu
Summary: Inverse gravity moment (IGM) is a text classification weighting scheme that focuses on distinguishing terms. However, it fails to address the issue of class imbalance in text classification, where minority classes are often neglected. We propose a method using relative imbalance ratio (RIR) to amplify the scores of terms from minority classes in IGM. Experimental results demonstrate that our method outperforms the original IGM, improved IGM, and other state-of-the-art term weighting schemes in terms of f1-macro results without compromising f1-micro.
EXPERT SYSTEMS WITH APPLICATIONS
(2023)
Article
Computer Science, Information Systems
Lu Gao, Mingjie Cai, Qingguo Li
Summary: This paper proposes a neighborhood rough set based approach for outlier detection, which can handle heterogeneous data and reduce hyper-parameters. It introduces a relative granular ratio factor to measure the size of a neighborhood and defines a granule-based majority set to capture the majority of objects. An outlier factor based on the feature of a negative region is determined to measure the difference between outliers and the majority set. The proposed approach, called RNRD-based outlier detection (RNROD), is evaluated on sixteen heterogeneous datasets and outperforms seven existing detection algorithms.
INFORMATION SCIENCES
(2023)
Article
Economics
Heni Boubaker, Ons Ben Larbi
Summary: This paper discusses the asymmetric volatility spillovers between the two markets in BRICS countries. The results show that hedging stocks with oil can bring economic benefits, but the effectiveness of hedging varies over time and depends on market conditions.
ECONOMIC ANALYSIS AND POLICY
(2022)
Article
Mathematics, Interdisciplinary Applications
Gaoliang Tao, Qing Wang, Qingsheng Chen, Sanjay Nimbalkar, Yinjie Peng, Heming Dong
Summary: This study successfully predicts the relative permeability coefficient of different soil types using a simplified unified model and air-entry value prediction model combined with graphical method, with results consistent with measured values. The method is simple, expands the application range of the model, and improves prediction accuracy.
FRACTAL AND FRACTIONAL
(2021)
Article
Engineering, Chemical
Zhengong Tong, Longwang Fu, Jun Li, Caixia Kang, Zheshuai Wu, Cilong Zhong
Summary: By controlling the parameters and analyzing the test results, it can be determined that within a certain range, the lower the dosage, the better the effect; under conditions of low concentration sludge water reuse, the effect is even better; reasonable control of the reflux parameters can prevent significant increase of water quality indicators in the effluent of the sedimentation basin, making the risk controllable.
DESALINATION AND WATER TREATMENT
(2021)
Article
Chemistry, Applied
Stefan Neuberg, Helmut Pennemann, Ole Wiborg, Martin Wichert, Ralf Zapf, Athanassios Ziogas, Gunther Kolb
Article
Engineering, Chemical
Ole Wiborg, Martin O'Connell, Richard Thiele, Martin Wichert, Gunther Kolb
CHEMICAL ENGINEERING & TECHNOLOGY
(2015)
Article
Engineering, Environmental
Qi Wang, Berta Spasova, Volker Hessel, Gunther Kolb
CHEMICAL ENGINEERING JOURNAL
(2015)
Editorial Material
Chemistry, Multidisciplinary
Hannah Newton, Qi Wang, Smitha Sundaram, Andre van Veen, Stefan Kiesewalter, Gunther Kolb
GREEN PROCESSING AND SYNTHESIS
(2015)
Article
Chemistry, Physical
Vetrivel Shanmugam, Stefan Neuberg, Ralf Zapf, Volker Hessel, Gunther Kolb
CATALYSIS COMMUNICATIONS
(2016)
Article
Chemistry, Applied
Helmut Pennemann, Gunther Kolb
Article
Engineering, Chemical
M. Wichert, R. Zapf, A. Ziogas, G. Kolb, E. Klemm
CHEMICAL ENGINEERING SCIENCE
(2016)
Article
Chemistry, Physical
Di Liu, Yong Men, Jinguo Wang, Gunther Kolb, Xin Liu, Yuanqiang Wang, Qiuyan Sun
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2016)
Article
Chemistry, Physical
Gregor Dolanc, BoStjan Pregelj, Janko Petrovcic, Joachim Pasel, Gunther Kolb
JOURNAL OF POWER SOURCES
(2016)
Article
Chemistry, Physical
G. Avgouropoulos, S. Schlicker, K. -P. Schelhaas, J. Papavasiliou, K. D. Papadimitriou, E. Theodorakopoulou, N. Gourdoupi, A. Machocki, T. Ioannides, J. K. Kallitsis, G. Kolb, S. Neophytides
JOURNAL OF POWER SOURCES
(2016)
Article
Chemistry, Physical
NUria J. Divins, Eduardo Lopez, Inmaculada Angurell, Stefan Neuberg, Ralf Zapf, Gunther Kolb, Jordi Llorca
Article
Chemistry, Multidisciplinary
Wojciech Gac, Witold Zawadzki, Marek Rotko, Magdalena Greluk, Grzegorz Slowik, Helmut Pennemann, Stefan Neuberg, Ralf Zapf, Gunther Kolb
Summary: The study reported direct methanation of CO2 over ceria- and alumina-supported nickel catalysts in the feed stream containing methane and traces of H2S. The results showed that ceria-supported nickel catalyst exhibited higher conversion at 350 degrees Celsius, while the introduction of trace amounts of H2S led to rapid decrease in CO2 conversion and CH4 selectivity.
Article
Chemistry, Physical
Tobias Weissenberger, Ralf Zapf, Helmut Pennemann, Gunther Kolb
Summary: The catalytic combustion of hydrogen and ammonia-containing off-gas surrogate from an ammonia solid oxide fuel cell (SOFC) was studied. The results showed that the tested catalysts were able to completely convert hydrogen and ammonia present in the off-gas. The formation of nitrogen oxides (NOx) increased with reaction temperature and stagnated at temperatures of 600 degrees C and higher.
Article
Engineering, Chemical
Kyatsinge Cedric Musavuli, Nicolaas Engelbrecht, Raymond Cecil Everson, Phillimon Modisha, Gunther Kolb, Ralf Zapf, Christian Hofmann, Dmitri Bessarabov
Summary: The study investigates the synthesis of methanol using a fixed-bed reactor with CO2 as the carbon feedstock. The results show promising performance under high pressure and specific conditions, providing insights for finding new ways to utilize CO2.
Article
Engineering, Chemical
Valery A. Danilov, Christian Hofmann, Gunther Kolb
Summary: The modeling of transfer processes was conducted to generalize and interpret experimental data on heat transfer. A two-dimensional model based on a homogeneous mixture model was developed for boiling water flow in a microchannel, with a new evaporation submodel. The simulation successfully predicted the distribution of velocity, void fraction, and temperature profiles in the microchannel, with the predicted temperature profile consistent with experimental literature data.
