Information Outlook, September 1998

Volume 2, Issue 9https://scholarworks.sjsu.edu/sla_io_1998/1008/thumbnail.jp

Fifty Years of the Exact Solution of the Two-Dimensional Ising Model by Onsager

The exact solution of the two-dimensional Ising model by Onsager in 1944 represents one of the landmarks in theoretical physics. On the occassion of the fifty years of the exact solution, we give a historical review of this model. After briefly discussing the exact solution by Onsager, we point out some of the recent developments in this field. The exact solution by Onsager has inspired several developments in various other fields. Some of these are also briefly mentioned.Comment: 14 pages, no figure, revtex file, To be Published in "Current Science (India)", minor corrections made in sec.

Evaluation of Operation IceBridge quick-look snow depth estimates on sea ice

We evaluate Operation IceBridge (OIB) ‘quick-look’ (QL) snow depth on sea ice retrievals using in situ measurements taken over immobile first-year ice (FYI) and multi-year ice (MYI) during March of 2014. Good agreement was found over undeformed FYI (-4.5 cm mean bias) with reduced agreement over deformed FYI (-6.6 cm mean bias). Over MYI, the mean bias was -5.7 cm but 54% of retrievals were discarded by the OIB retrieval process as compared to only 10% over FYI. Footprint scale analysis revealed a root mean square error (RMSE) of 6.2 cm over undeformed FYI with RMSE of 10.5 cm and 17.5 cm in the more complex deformed FYI and MYI environments. Correlation analysis was used to demonstrate contrasting retrieval uncertainty associated with spatial aggregation and ice surface roughness

Information Outlook, February 1998

Volume 2, Issue 2https://scholarworks.sjsu.edu/sla_io_1998/1001/thumbnail.jp

Information Outlook, August 2001

Volume 5, Issue 8https://scholarworks.sjsu.edu/sla_io_2001/1007/thumbnail.jp

Numerical analysis of structural behavior of welded wire reinforcement in reinforced concrete beams

Thesis (M.S.) University of Alaska Fairbanks, 2016Modernization and industrialization have paved the way for the construction industry of India to expand. On the other hand the Indian construction industry is set to face an acute workforce shortage. The shortage of construction workers has in fact slowed down the growth of this industry in major cities across the country and escalated its cost by 40 percent. An alternative way to replace the labor force is by automation techniques. This study is a numerical analysis to evaluate structural behavior of simply supported concrete beams reinforced with welded wires in comparison with mild steel reinforced concrete beams. Welding conventional steel bars (60 ksi) reduces their shear strength by 50 percent. Welded Wire Reinforcement (80 ksi), with its greater strength, higher durability, significantly lower placing and overall cost, provides an alternative and perhaps a better substitution for mild steel bars. The commercial finite element analysis program, ABAQUS, was used to model the non-linear behavior of reinforced concrete beams. In order to evaluate the structural behavior of welded wire reinforced concrete beams, different configurations of longitudinal and transverse wires have been considered. First, different types of stirrup configurations in a rectangular reinforced concrete beam are compared with a conventional reinforced beam. Second, a structurally performing welded wire configuration is compared with a Mexican chair styled reinforcement configuration. This part of the analysis is evaluated for a T–beam, used for building roof applications.Chapter 1 Introduction -- Welded Wire Reinforcement -- Traditional Rebar versus Welded Wire Reinforcement (WWR) -- Potential Gains through Welded Wire Reinforcement (WWR) -- Welded Wire Reinforcement Specifications and Nomenclature -- Welded Wire Reinforcement Manufacturing, Handling and Placing -- Aim and Scope -- Outline of Thesis -- Chapter 2 Literature Review -- Impact of Welded Wire Reinforcement in Structural Members -- Welded Wire Reinforcements in Columns -- Welded Wire Reinforcements in Beams and Girders -- Welded Wire Reinforcements in Structural Walls -- Summary -- Chapter 3 Finite Element Modeling of Reinforced Concrete Beams -- ABAQUS Modeling -- Non-linear Behavior of Concrete -- Uniaxial and Biaxial Behavior -- Non-linear Modeling of Reinforced Concrete Beam -- Material Model Properties -- Concrete Damage Plasticity Parameters -- Reinforcement Properties -- Convergence Analysis -- Chapter 4 Numerical Analysis of Concrete Beams Reinforced with Traditional and Welded Wire Reinforcement -- Introduction -- Initial Validation and Mesh Convergence -- Analysis of Welded Wire Reinforcement Grids in Reinforced Concrete Beams -- Rectangular Reinforced Concrete Beams Subjected to Four Point Loading Condition -- Rectangular Reinforced Concrete Beams Subjected to Uniformly Distributed Loading Condition -- T - Beams Subjected to Four Point Loading Condition -- Chapter 5 Conclusion and Recommendation -- Conclusion -- Recommendation -- References

Silicon Superconducting Quantum Interference Device

We have studied a Superconducting Quantum Interference SQUID device made from a single layer thin film of superconducting silicon. The superconducting layer is obtained by heavily doping a silicon wafer with boron atoms using the Gas Immersion Laser Doping (GILD) technique. The SQUID device is composed of two nano-bridges (Dayem bridges) in a loop and shows magnetic flux modulation at low temperature and low magnetic field. The overall behavior shows very good agreement with numerical simulations based on the Ginzburg-Landau equations.Comment: Published in Applied Physics Letters (August 2015