Registered Data

[CT157]

[02389] Exploring the excess of cloud condensation nuclei and rain suppression using a minimal 3D Boussinesq model with bulk cloud microphysics

  • Session Date & Time : 3C (Aug.23, 13:20-15:00)
  • Type : Contributed Talk
  • Abstract : For many decades the hypothesis that an increase in air pollution could affect the rain formation processes has been discussed with theoretical, experimental, and numerical arguments. Several studies have shown that higher pollutant concentrations can inhibit, decrease or increase precipitation. Differences between results arise partly from the complexity of the problem, which requires the consideration of processes at multiple scales. This study aims to provide a very simple numerical model that satisfactorily represents the atmospheric dynamics and cloud microphysics to explore the effect of pollution on rain formation. We adapted and extended a previously existing three-dimensional minimal model consisting of five equations describing the atmospheric dynamics and implemented a simple bulk parametrization that represents the role of cloud condensation nuclei (CCN) 's role in cloud formation processes. To explore the effect of different CCN concentrations and distributions, we used two CCN profiles, one with a single accumulation layer and one with two layers, modifying their concentrations. Our results showed that polluted scenarios resulted in rain inhibition when a single CCN layer was initially present and rain increment when two layers were present. In low-polluted environments, both CCN initial profiles generated similar precipitation and showed similar dynamic patterns. In this talk, we will highlight the importance of the vertical distribution of CCN, not only concentration, on the formation of rain, its inhibition, or suppression. This is joint work with Olmo Guerrero Medina.
  • Classification : 86A08, 35Q86
  • Author(s) :
    • Gerardo Hernandez-Duenas (National Autonomous University of Mexico, Institute of Mathematicas)
    • Olmo Guerrero-Medina (University of California Davis)

[00863] Statistical Analysis of Earthquake in Nepal-Himalaya including Bengal Basin Zone

  • Session Date & Time : 3C (Aug.23, 13:20-15:00)
  • Type : Contributed Talk
  • Abstract : The statistical analysis of earthquakes in the Nepal-Himalaya and Burma plates including the Bengal Basin and Bay of Bengal Zones is investigated. There are 13352 earthquakes in the dataset with magnitudes ranging from 2 to 7.8 between January 2000 to June 2021 are collected and analyzed. The Gautenberg-Richter law is used to estimate a-values and b-values for the entire data as well as for different zones. R programming has been used for data cleaning, and data filtering as well as to carry out all the statistical analysis and visualization.
  • Classification : 86A15, 76U05, 85-11, 62E17, 62P12
  • Author(s) :
    • Santanu Manna (Department of Mathematics, Indian Institute of Technology Indore, Simrol, Indore, Madhya Pradesh 453552, India)
    • Harsh Joshi (University of Delhi, Hansraj College, Malka Ganj, Delhi110007, India)

[01638] Strategyproof Mechanisms for Group-Fair Facility Location Problems

  • Session Date & Time : 3C (Aug.23, 13:20-15:00)
  • Type : Contributed Talk
  • Abstract : We study the facility location problems where agents are located on a real line and divided into groups based on criteria such as ethnicity or age. Our aim is to design mechanisms to locate a facility to approximately minimize the costs of groups of agents to the facility fairly while eliciting the agents' locations truthfully. We first explore various well-motivated group fairness cost objectives for the problems and show that many natural objectives have an unbounded approximation ratio. We then consider minimizing the maximum total group cost and minimizing the average group cost objectives. For these objectives, we show that existing classical mechanisms (e.g., median) and new group-based mechanisms provide bounded approximation ratios, where the group-based mechanisms can achieve better ratios. We also provide lower bounds for both objectives. To measure fairness between groups and within each group, we study a new notion of intergroup and intragroup fairness (IIF) . We consider two IIF objectives and provide mechanisms with tight approximation ratios.
  • Classification : 91-10
  • Author(s) :
    • Houyu Zhou (City University of Hong Kong)
    • Minming Li (City University of Hong Kong)
    • Hau Chan (University of Nebraska-Lincoln)

[02635] Application of mathematics in large-scale agriculture projects

  • Session Date & Time : 3C (Aug.23, 13:20-15:00)
  • Type : Industrial Contributed Talk
  • Abstract : Two large-scale projects, each involving a consorcium of breeding, growing and processing companies from potato industry in the Netherlands will be described, with the emphasis on the increasingly important role the mathematics is playing in these projects. Applied mathematics is required at the three major stages: design of experiments, data pre-processing, and association-regression studies. Successes and current challenges will be discussed.
  • Classification : 92F05, 65Z05, 62J02, 62J05, 62J07, mathematics for agriculture
  • Author(s) :
    • Neil Budko (Delft University of Technology)