Extensive research efforts have been dedicated to enhancing the corrosion resistance properties and mitigating the reactivity of metals.Various surface modification techniques,including anodizing,electrochemical depos...Extensive research efforts have been dedicated to enhancing the corrosion resistance properties and mitigating the reactivity of metals.Various surface modification techniques,including anodizing,electrochemical deposition,non-electric current-based coating,ion implantation,conversion coatings,and organic coatings,have been explored for these objectives.Among these surface modification methodologies,conversion coatings have garnered substantial attention due to their capacity of depositing onto metal surfaces uniformly,enhancing adhesion for subsequent layers,facilitating ease of application,and offering cost-effectiveness.Different coatings,each possessing distinct properties,have been employed for diverse metals.Nonetheless,in light of hexavalent chromium compounds'elevated toxicity and carcinogenic nature,environmentally compatible conversion coatings are actively sought as viable alternatives.The deposition of conversion coatings is an intricate process influenced by several variables.Consequently,laboratory optimization of conditions is imperative for commercializing specialized conversion coatings.Further research endeavors are warranted to expand the standards and requisite characteristics for specific applications.Composite conversion coatings,formulated with rare earth elements and innovative mineral and organic transformative agents,hold promise as a subject of investigation.Advanced studies in theoretical research and computer modeling about the mechanism of crack prevention in rare earth element-based co nversion coatings devoid of defects will yield valuable insights.The present work furnishes a comprehensive review of this subject,marking its inaugural examination.展开更多
Potentiodynamic results of anodic behavior of Zn5Al and Zn55Al alloys, alloyed with Beryllium in the ambience of NaCl electrolyte and their microstructures are studied. They showed that a small addition of Beryllium (...Potentiodynamic results of anodic behavior of Zn5Al and Zn55Al alloys, alloyed with Beryllium in the ambience of NaCl electrolyte and their microstructures are studied. They showed that a small addition of Beryllium (0.005 - 0.05 wt%) improves the corrosion resistance of Zn5Al and Zn55Al original alloys to 2 - 3 times by changing grains shape to spherical and changing sizes to small grains. The proposed composition of Zinc-Aluminum alloy, which contains of Beryllium, can be used as anodic coatings to protect steel products and constructions against corrosion.展开更多
The results of anodic behavior of Zn5Al, Zn55Al alloys alloyed with Magnesium in the environment and their micro-structures are studied. A potentiodynamical research carried out by Zinc-Aluminum alloys, alloyed with M...The results of anodic behavior of Zn5Al, Zn55Al alloys alloyed with Magnesium in the environment and their micro-structures are studied. A potentiodynamical research carried out by Zinc-Aluminum alloys, alloyed with Magnesium obtained a corrosion-resistant coating with optimum concentration of Magnesium about 0.005 - 0.1wt%. The rate of corrosion of these alloys is 2 - 2.5 times lower than Zn5Al, Zn55Al initial alloys. It is explained by the effect of modification on the structure of original alloys and they can be used as an anticorrosion coating for protecting corrosion of steel frames.展开更多
As rule-based systems (RBS) technology gains wider acceptance, the need to create and maintain large knowledge bases will assume greater importance. Demonstrating a rule base to be free from error remains one of the o...As rule-based systems (RBS) technology gains wider acceptance, the need to create and maintain large knowledge bases will assume greater importance. Demonstrating a rule base to be free from error remains one of the obstacles to the adoption of this technology. In the past several years, a vast body of research has been carried out in developing various graphical techniques such as utilizing Petri Nets to analyze structural errors in rule-based systems, which utilize propositional logic. Four typical errors in rule-based systems are redundancy, circularity, incompleteness, and inconsistency. Recently, a DNA-based computing approach to detect these errors has been proposed. That paper presents algorithms which are able to detect structural errors just for special cases. For a rule base, which contains multiple starting nodes and goal nodes, structural errors are not removed correctly by utilizing the algorithms proposed in that paper and algorithms lack generality. In this study algorithms mainly based on Adleman’s operations, which are able to detect structural errors, in any form that they may arise in rule base, are presented. The potential of applying our algorithm is auspicious giving the operational time complexity of O(n*(Max{q, K, z})), in which n is the number of fact clauses;q is the number of rules in the longest inference chain;K is the number of tubes containing antecedents which are comprised of distinct number of starting nodes;and z denotes the maximum number of distinct antecedents comprised of the same number of starting nodes.展开更多
文摘Extensive research efforts have been dedicated to enhancing the corrosion resistance properties and mitigating the reactivity of metals.Various surface modification techniques,including anodizing,electrochemical deposition,non-electric current-based coating,ion implantation,conversion coatings,and organic coatings,have been explored for these objectives.Among these surface modification methodologies,conversion coatings have garnered substantial attention due to their capacity of depositing onto metal surfaces uniformly,enhancing adhesion for subsequent layers,facilitating ease of application,and offering cost-effectiveness.Different coatings,each possessing distinct properties,have been employed for diverse metals.Nonetheless,in light of hexavalent chromium compounds'elevated toxicity and carcinogenic nature,environmentally compatible conversion coatings are actively sought as viable alternatives.The deposition of conversion coatings is an intricate process influenced by several variables.Consequently,laboratory optimization of conditions is imperative for commercializing specialized conversion coatings.Further research endeavors are warranted to expand the standards and requisite characteristics for specific applications.Composite conversion coatings,formulated with rare earth elements and innovative mineral and organic transformative agents,hold promise as a subject of investigation.Advanced studies in theoretical research and computer modeling about the mechanism of crack prevention in rare earth element-based co nversion coatings devoid of defects will yield valuable insights.The present work furnishes a comprehensive review of this subject,marking its inaugural examination.
文摘Potentiodynamic results of anodic behavior of Zn5Al and Zn55Al alloys, alloyed with Beryllium in the ambience of NaCl electrolyte and their microstructures are studied. They showed that a small addition of Beryllium (0.005 - 0.05 wt%) improves the corrosion resistance of Zn5Al and Zn55Al original alloys to 2 - 3 times by changing grains shape to spherical and changing sizes to small grains. The proposed composition of Zinc-Aluminum alloy, which contains of Beryllium, can be used as anodic coatings to protect steel products and constructions against corrosion.
文摘The results of anodic behavior of Zn5Al, Zn55Al alloys alloyed with Magnesium in the environment and their micro-structures are studied. A potentiodynamical research carried out by Zinc-Aluminum alloys, alloyed with Magnesium obtained a corrosion-resistant coating with optimum concentration of Magnesium about 0.005 - 0.1wt%. The rate of corrosion of these alloys is 2 - 2.5 times lower than Zn5Al, Zn55Al initial alloys. It is explained by the effect of modification on the structure of original alloys and they can be used as an anticorrosion coating for protecting corrosion of steel frames.
文摘As rule-based systems (RBS) technology gains wider acceptance, the need to create and maintain large knowledge bases will assume greater importance. Demonstrating a rule base to be free from error remains one of the obstacles to the adoption of this technology. In the past several years, a vast body of research has been carried out in developing various graphical techniques such as utilizing Petri Nets to analyze structural errors in rule-based systems, which utilize propositional logic. Four typical errors in rule-based systems are redundancy, circularity, incompleteness, and inconsistency. Recently, a DNA-based computing approach to detect these errors has been proposed. That paper presents algorithms which are able to detect structural errors just for special cases. For a rule base, which contains multiple starting nodes and goal nodes, structural errors are not removed correctly by utilizing the algorithms proposed in that paper and algorithms lack generality. In this study algorithms mainly based on Adleman’s operations, which are able to detect structural errors, in any form that they may arise in rule base, are presented. The potential of applying our algorithm is auspicious giving the operational time complexity of O(n*(Max{q, K, z})), in which n is the number of fact clauses;q is the number of rules in the longest inference chain;K is the number of tubes containing antecedents which are comprised of distinct number of starting nodes;and z denotes the maximum number of distinct antecedents comprised of the same number of starting nodes.
