Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Galvanized steel"”.
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Resistance spot welding of galvanized steel sheet
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1984.
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Analysis of Galvanized Steel Plates Using Glow Discharge-Atomic Emission Spectrometry
… operation parameters of SA-2000 for analysis of galvanized steel plate and to investigate the method for qualitatively and quantitatively analyzing the zinc coating. Under the optimum experimental conditions found in our study, which are current of 19-21 mA; voltage of 900-1200 V; pressure …
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Classification on real-time videos of galvanized steel surface defect using support vector machines and convolutional neural network, based on data created by generative adversarial networks
… of video images to identify surface defects on galvanized steel tubes in real-time during production. To meet the criteria of accuracy, robustness, and speed, a conventional Support Vector Machine was first tested, and proved to be moderately accurate at 91% and moderately-robust, but satisfying …
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Adherence and Biofilm Formation of Mycobacterium avium, Mycobacterium intracellulare, and Mycobacterium abscessus in household plumbing
… systems, including glass, copper, stainless steel, polyvinyl chloride, and galvanized steel. All experiments were conducted with sterile, Blacksburg tap water in a CDC Biofilm Reactor. Highest adherence was observed by M. avium on galvanized steel surfaces, reaching 15,100 CFU/cm2 surface at …
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Extraction of zinc from scrap steel using zinc-bromine battery technology
Steelmaking will likely not reach its carbon neutrality by 2050 without technical innovations. The steel industry struggles with scrap recycling because of zinc content within scrap needing to be of a suitable level (16 wt%) to be economically viable. Current steel recycling methods (pyrometallurgy …
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Measurements of multiple scattering, range, and range straggling of low energy pions and muons
… incident upon and scattered from thin sheets of galvanized steel, aluminum, and polyethylene, and the ranges of these muons in the proportional chamber stack, their multiple scattering as a function of energy has been obtained. The measured rms projected multiple scattering angle was fitted to a …
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Design of a hydraulic bulge test apparatus
… MIT, for the testing of Advanced High Strength Steel. The hydraulic bulge test was identified as the most economical solution. The equipment was designed to accommodate material strength of up to 1000MPa with plate thickness between 1.0mm and 1.8mm. The design process is explained in detail with …
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Multi-classification and object detection in intelligent manufacturing
… develop a computer vision system for automated galvanized steel tube defect detection. Based on images collected from a Japanese steel tube producer, multiple methods were explored and tested. Firstly, inception v4 was used as an image classification model. Its performance was first tested on an …
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Pressure loss prediction and control model for water treatment units
… pressure drop is minimum for PVC and Stainless steel and maximum for galvanized steel. As the piping roughness increase, pressure drop will increase in general for any water internal flow rate. As internal flow rate increased, water pressure drop increase .This result is very important for …
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Experimentally Determined Equivalent Roughness Values For Two Types of Longitudinal Straight Duct Produced by a Small Company
… data was collected for these galvanized steel ducts over a range of 1500-5000 fpm with nominal diameters of 4-8 inches. It was found that hydraulically smooth conditions could be applied for all the tested cases. However, the hydraulically smooth predictive equations resulted …
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Accumulation of Lead by Biofilms in Drinking Water Distribution Systems
… with a maximum increase of 21.42 µg/cm2 in the galvanized steel pipe and then a gradual decrease during a period of one month afterward. The lead source also had an effect on the microbiome of the biofilms collected during the project. One genus specifically, Sphingobium, increased in all pipe …
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Development of Environmentally Friendly Non-Chrome Conversion Coatings for Cold-Rolled Steel
Steel producers use various organic and inorganic coatings to protect cold-rolled steel (CRS) sheets from corrosion during shipment and storage. It is well known that CRS sheets can be protected from corrosion by galvanizing, phosphating, chromating, topcoating with organic, or their combinations. …
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EXPERIMENTAL STUDIES OF THE CHEMICAL EFFECTS OF ZINC-BEARING MATERIALS FOLLOWING A LOSS-OF-COOLANT ACCIDENT IN A PRESSURIZED WATER REACTOR
… Zinc-bearing materials in containment include galvanized steel and inorganic zinc-coated steel (IOZ). This research has shown that zinc interacts with post-LOCA containment chemistry to form chemical products including zinc oxide and zinc phosphate, which may become available to transport to …
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The performance of an underground storage structure for urban stormwater quality management
… probably because the storage pipe, being made of galvanized steel, was a source of zinc.
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Effect Of Source Water Blending On Copper Release In Pipe Distribution System: Thermodynamic And Empirical Models
… (PDSs) that were made from unlined cast iron and galvanized steel pipes, and lined cement and PVC pipes taken from actual distribution systems. Totally seven different waters were studied, which consisted of three source waters: groundwater, surface, and simulated brackish water designated as G1, …
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Urban stormwater runoff contamination associated with gutter and pipe material degradation
… of zinc, copper, and lead during the tests, with galvanized steel materials being the most significant sources of lead and zinc, while copper materials were the most important source of copper (as expected). Zinc, copper, and lead releases were detected during both short and long exposure times …
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Effect of Installation Practices on Galvanic Corrosion in Service Lines, Low Flow Rate Sampling for Detecting Water-Lead Hazards, and Trace Metals on Drinking Water Pipeline Corrosion: Lessons in Unintended Consequences
… due to detachment of lead particulates. Although galvanized steel was previously considered a minor lead source, it can contain up to 2% lead on the surface, and elevated lead-in-water samples from several cities were traced to galvanized pipe, including the home of a child with elevated blood …
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Biostability In Drinking Water Distribution Systems Study At Pilot-scale
… reactive materials (e.g. unlined cast iron and galvanized steel) were significantly greater than on PVC and lined cast iron. Biofilm modeling showed that attached bacteria were most affected by temperature and much less by HRT, bulk HPC and residual. The model predicts biofilms will always be …
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Nitrification Investigation And Modeling In The Chloraminated Drinking Water Distribution System
… distribution systems. Unlined cast iron (UCI), galvanized steel (G), lined cast iron (LCI), and PVC pipes were used to build the PDSs. All finished waters were stabilized and chloraminated before entering the PDSs. This dissertation consists of five major parts. (1) System variations of …
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Identification and Characterization of the Iron-Zinc Intermetallics Formed in Galvanneal steel
… demand to improve the corrosion resistance of steel sheet, particularly for use within the automotive industry, has led to a dramatic increase in the use of coated steels in place of cold-rolled sheet steel. Galvanneal steel results from the post annealing of the zinc-coated steel sheet, in …
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