WELCOME TO SIGMA
The Stout Infrastructure, Geotechnics and Materials (SIGMa) Laboratory is a research and innovation group directed by Dr. Hessam Yazdani within the Department of Civil and Environmental Engineering at Howard University. Our inter- and transdisciplinary research at SIGMa is dedicated to enhancing the sustainability and resilience of civil and marine infrastructure through 1) developing high-performance and multifunctional materials, 2) addressing the geotechnical aspects of infrastructure such as renewable energy sources, 3) incorporating reliability and optimization into the design of interacting geotechnical and structural systems and 4) improving the durability of civil and marine infrastructure.
SEISMIC ENERGY DISSIPATION-BASED OPTIMUM DESIGN OF TUNED MASS DAMPERS
We identified suitable objective functions for the optimum seismic design of the tuned mass damper of inelastic, steel moment-resisting frames.
September 11, 2020
Our paper "Mechanical properties of C3N nanotubes" was accepted for publication in the journal Diamond and Related Materials. Congrats, Hamid, Brandon, and Jade.
September 1, 2020
An HU team led by Dr. Yazdani received a $569,904 grant from the Air Force Office of Scientific Research (AFOSR) Defense University Research Instrumentation Program (DURIP). The team represents a diverse set of disciplines including Civil and Environmental Engineering (co-PIs: Drs. Claudia Marin-Artieda and Jeseth Delgado Vela), Mechanical Engineering (Dr. Mohsen Mosleh), Physics (Dr. Prabhakar Misra), and Radiology and Biochemistry (Dr. Paul Wang). The award will allow for purchasing state-of-the-art equipment comprising a laser scanning confocal microscope, a scanning electron microscope, a thermal conductivity meter, and a tensile testing machine to support research and education in advanced materials, water treatment and environmental chemistry, orthotics and prosthetics, and traumatic brain injury. We thank AFOSR Program Manager Dr. Ali Sayir for his support.
March 9, 2020
Our paper "Mechanical properties of defective cyanoethynyl (2D polyaniline – C3N): A comparative molecular dynamics study versus graphene and hexagonal boron nitride" was accepted for publication in the journal Physica E: Low-dimensional Systems and Nanostructures. Congrats, Hamid and Jade.
May 20-30, 2019
Dr. Yazdani and Hamid attended the workshop “Computational mathematics for model reduction and predictive modelling in molecular and complex systems” organized by the Centre Interfacultaire Bernoulli (CIB) and the Centre Européen de Calcul Atomique et Moléculaire (CECAM) at the Ecole polytechnique fédérale de Lausanne (EPFL), Switzerland. Dr. Yazdani gave his invited talk on developing probabilistic integrated computational materials engineering models for polymer nanocomposites using image-based multiscale modeling and machine learning, and Hamid presented his work on developing failure criteria for nanomaterials using atomistic simulations and machine learning.
April 23, 2019
Dr. Yazdani received the 2019 "Faculty of the Year" Award of the ASCE HU Chapter.
April 11 and 12, 2019
Hamid, Sigmund, Emilda and Christopher presented their research (four different presentations/posters) at the Howard University 2019 Research Symposium. Well done, SIGMa's energy conduits.
April 9, 2019
Christopher was admitted to the 2019 Joint Application for Summer Internship Programs of the Harvard John A. Paulson School of Engineering and Applied Sciences. Congrats, Chris.
April 7, 2019
Dr. Yazdani was invited to deliver a talk on the multiscale modeling and simulation of materials at the 2019 Engineering Mechanics Institute Conference in Pasadena, CA.
March 26 to April 2, 2019
Hamid attended the "Big data and uncertainty quantification: statistical inference and information-theoretic techniques applied to computational chemistry" workshop at the École Polytechnique fédérale de Lausanne (EPFL), Switzerland.
February 19, 2019
Hamid won travel grants to attend the workshops "Computational mathematics for model reduction and predictive modelling in molecular and complex systems" and "Big data and uncertainty quantification: statistical inference and information-theoretic techniques applied to computational chemistry" at the École Polytechnique fédérale de Lausanne (EPFL), Switzerland, in March and May 2019. Congrats, Hamid.
February 11, 2019
Our paper "Estimating inelastic seismic response of reinforced concrete frame structures using a wavelet support vector machine and an artificial neural network" was accepted for publication in the journal Neural Computing and Applications.
November 15, 2018
Hamid presented his research with Dr. Marin titled "Validated Nonlinear Finite Element Analysis of Wire Rope Isolators under Dynamic Excitations" at the ASME's International Mechanical Engineering Congress and Exposition (IMECE) in Pittsburgh, PA.
November 11-13, 2018
Dr. Yazdani and Hamid attended the USC MAGICS workshop in Germantown, MD. The workshop covered topics spanning nonequilibrium and quantum molecular dynamics to the application of machine learning in materials science.
October 28, 2018
Our paper "Mechanical properties of carbon nanotube-filled polyethylene composites: a molecular dynamics simulation study" was accepted for publication in the journal Polymer Composites.
Hamid's abstract titled "Validated Nonlinear Finite Element Analysis of Wire Rope Isolators under Dynamic Excitations" was accepted for a student poster competition at the ASME's International Mechanical Engineering Congress and Exposition (IMECE) in Pittsburgh, PA. The work is an element of Dr. Marin's NSF CAREER award. Congrats to both.
June 20, 2018
Ph.D. student Hamid Ghasemi won the first place in the 2018 student poster competition of the American Society of Naval Engineers (ASNE) for his research titled “Atomistic insight into anti-corrosion role of graphene as a coating in metals: a molecular dynamics simulation approach”. Congratulations, Hamid.
June 13, 2018
Our paper "Seismic energy dissipation-based optimum design of tuned mass dampers" was accepted for publication in the journal Structural and Multidisciplinary Optimization.
May 31, 2018
Our paper "Laboratory tests on the engineering properties of sensor-enabled geobelts (SEGB) by Cui et al., geotextiles and geomembranes 46 (2018) 66–76.” was accepted for publication in the journal Geotextiles and Geomembranes.
May 11, 2018
Ph.D. student Hamid Ghasemi received the 2018-2019 Just-Julian Graduate Research Assistantship Award. Congrats, Hamid.
August 22, 2017
Hamid Ghasemi joined SIGMa as its first Ph.D. student. Welcome aboard, Hamid.
June 14, 2017
Our paper "Accelerated multi-gravitational search algorithm for size optimization of truss structures" was accepted for publication in the journal Swarm and Evolutionary Computation.
June 20, 2017
Our paper "Probabilistic performance-based optimum seismic design of RC structures considering soil-structure interaction effects" was accepted for publication in the ASCE-ASME Journal of Risk and Uncertainty in Engineering Systems, Part A: Civil Engineering.
April 26, 2017
Our paper "Mechanical properties of single-walled carbon nanotubes: a comprehensive molecular dynamics study" was accepted for publication in the journal Materials Research Express.
April 19, 2017
Dr. Yazdani received the 2017 "Best Teacher Award" and the 2017 "Best Mentor Award" of the ASCE Howard University Student Chapter.
November 27, 2016
Our paper "Sensor-enabled geogrids for stabilization and performance monitoring of earth structures: the state of development" was accepted for publication in International Journal of Geosynthetics and Ground Engineering.