Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (6939)
- Engineering (2064)
- Education (1757)
- Computer Sciences (1586)
- Social and Behavioral Sciences (1432)
-
- Environmental Sciences (1420)
- Life Sciences (959)
- Chemistry (953)
- Physics (941)
- Arts and Humanities (749)
- Mathematics (690)
- Law (628)
- Earth Sciences (581)
- Electrical and Computer Engineering (580)
- Computer Engineering (513)
- Business (417)
- Oceanography and Atmospheric Sciences and Meteorology (412)
- Medicine and Health Sciences (385)
- Higher Education (374)
- Statistics and Probability (371)
- Natural Resources and Conservation (299)
- Science and Mathematics Education (289)
- Public Affairs, Public Policy and Public Administration (284)
- Civil and Environmental Engineering (277)
- Astrophysics and Astronomy (276)
- Teacher Education and Professional Development (257)
- Mechanical Engineering (255)
- Databases and Information Systems (243)
- Educational Administration and Supervision (240)
- Sustainability (239)
- Institution
-
- University of Nebraska - Lincoln (932)
- Brigham Young University (471)
- California Polytechnic State University, San Luis Obispo (386)
- Missouri University of Science and Technology (371)
- University of Nevada, Las Vegas (337)
-
- Louisiana State University (336)
- Wright State University (334)
- Clemson University (319)
- TÜBİTAK (314)
- Utah State University (305)
- Singapore Management University (289)
- University of South Florida (285)
- University of Central Florida (224)
- Portland State University (219)
- Old Dominion University (214)
- Technological University Dublin (200)
- Purdue University (186)
- University of Texas at El Paso (175)
- Southern Illinois University Carbondale (174)
- Georgia Southern University (167)
- Virginia Commonwealth University (167)
- Edith Cowan University (162)
- Wayne State University (161)
- Air Force Institute of Technology (158)
- University of Kentucky (150)
- University of New Mexico (148)
- Western Kentucky University (145)
- University of New Hampshire (137)
- Marquette University (131)
- University of Malaya (124)
- Keyword
-
- Education (193)
- Mathematics (95)
- United States (74)
- Engineering (66)
- College for Professional Studies (65)
-
- Higher education (61)
- Newspaper (57)
- School of Computer & Information Science (57)
- Simulation (54)
- Climate change (52)
- Newsletter (51)
- Research (50)
- 2010 (48)
- Global Financial Crisis (2007-2009) (48)
- Physics (45)
- Technology (45)
- Sustainability (44)
- Faculty (42)
- History (41)
- Statistics (40)
- Environment (39)
- Financial Crisis Inquiry Commission (FCIC) (39)
- Water quality (39)
- Western Kentucky University (38)
- Assessment (37)
- ETD (37)
- Optimization (37)
- Academic achievement (36)
- Chemistry (36)
- Leadership (36)
- Publication
-
- Theses and Dissertations (571)
- Electronic Theses and Dissertations (328)
- Faculty Publications (287)
- International Congress on Environmental Modelling and Software (254)
- Research Collection School Of Computing and Information Systems (234)
-
- Dissertations (222)
- Theses (145)
- Computer Science & Engineering Syllabi (139)
- Articles (124)
- UNLV Theses, Dissertations, Professional Papers, and Capstones (119)
- Open Access Theses & Dissertations (113)
- All Graduate Theses and Dissertations, Spring 1920 to Summer 2023 (109)
- USF Tampa Graduate Theses and Dissertations (105)
- LSU Doctoral Dissertations (104)
- Turkish Journal of Chemistry (98)
- All Theses (94)
- LSU Master's Theses (93)
- S.C. Water Resources Conference (93)
- Browse all Theses and Dissertations (87)
- Masters Theses (87)
- Doctoral Dissertations (85)
- Master's Theses (85)
- Graduate Theses, Dissertations, and Problem Reports (ETD) (81)
- Sci-Tech News (80)
- Journal of Electrochemistry (79)
- Publications (78)
- The Open Court (78)
- Turkish Journal of Electrical Engineering and Computer Sciences (75)
- All Dissertations (73)
- Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions) (72)
- Publication Type
- File Type
Articles 1231 - 1260 of 16045
Full-Text Articles in Entire DC Network
Characterization Of The Structure And Function Of Nucleotide Pyrophosphatase/Phosphodiesterase 7, Irene Werengekha Wanjala
Characterization Of The Structure And Function Of Nucleotide Pyrophosphatase/Phosphodiesterase 7, Irene Werengekha Wanjala
Electronic Theses and Dissertations Archive
Nucleotide pyrophosphatase/phosphdiesterase (NPP) 7 , also known as alkaline sphingomyelinase (Alk-SMase) is a membrane-anchored ectoenzyme initially discovered in the intestinal tract in 1969. It is the most recently identified NPP isoform.The NPP family of enzymes currently consists of seven members, NPP1-7, numbered according to the order in which they were first associated with the NPP family.NPP enzymes hydrolyze a wide range of substrates. NPP1 and 3 are nucleotide pyrophosphatases that cleave inorganic phosphate from nucleatides and their derivatives. In contrast, NPP2, NPP6 and NPP7 are phosphodiesterases that hydrolyze phosphodiester bonds in lysolipid substrates and their derivatives. NPP4 and NPP5 are …
A 24ft/7.3m Parabolic Reflector Antenna Performance & Feed Design Analysis, Anthony Shelley
A 24ft/7.3m Parabolic Reflector Antenna Performance & Feed Design Analysis, Anthony Shelley
Morehead State Theses and Dissertations
A thesis presented to the faculty of the College of Science & Technology at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science by Anthony Shelley on November 29, 2010.
The Statesman, V. 54, I. 14, Stony Brook University
The Statesman, V. 54, I. 14, Stony Brook University
Stony Brook Statesman-Sucolian
v. 54, i. 14
On-Metal Synthesis Of Some Rhenium Complexes, Chad L. Phillips
On-Metal Synthesis Of Some Rhenium Complexes, Chad L. Phillips
Mahurin Honors College Capstone Experience/Thesis Projects
In 1977, Shirakawa and coworkers discovered the first conductive polymers. Their conductive polymers have been extensively studied. Though some of these first conductive polymers such as polyactelyne seemed to be a promising organic conductor, the commercial applications of these polymers were severely limited due the polymer’s highly air-sensitive nature. Thus, the current focus has shifted towards the development of heterocyclic aromatic polymers which are air-stable and have a low band gap. Expanding of the work of Snyder and Selegue, the focus of my research has been the incorporation of rhenium metal into an organic compound in an on-metal fashion. Several …
Hospital Network Infrastructure: A Modern Look Into The Network Backbone With Real Time Visibility, Homan Mike Hirad
Hospital Network Infrastructure: A Modern Look Into The Network Backbone With Real Time Visibility, Homan Mike Hirad
Regis University Student Publications (comprehensive collection)
For the purposes of this research, the "design science" discipline of Information Systems will structure the overall methodology and framework for results. By leveraging the design science framework, this study will dissect and analyze various parts of a hospital's network, to uncover substandard practices and problematic weaknesses that commonly result in an overall decrease in the quality of healthcare provided to patients, and negatively affect business operations of hospitals and healthcare facilities. For the purposes of this research the chosen hospital will be categorized as Mid-Western Hospital. This thesis will investigate, in a real world healthcare organization, fault management technologies …
Iconic Semantics In Phonology: A Corpus Study Of Japanese Mimetics, Joshua Marrinor Caldwell
Iconic Semantics In Phonology: A Corpus Study Of Japanese Mimetics, Joshua Marrinor Caldwell
Theses and Dissertations
Recent research on Japanese mimetics examines which part of speech the mimetic occurs as. An individual mimetic can appear as a noun, an adjective, an adverb, or a verb (Tsujimura & Deguchi 2007, 340). It is assumed by many scholars that mimetic words essentially function as adverbs (Inose 2007, 98). Few data-based studies exist that quantify the relative frequency of mimetic words in different word categories. Akita (2009) and Caldwell (2009a) have performed small scale or preliminary studies of this aspect of Japanese mimetics. The use of mimetics in other grammatical function categories has been attributed to the polysemous nature …
Central Florida Future, Vol. 42 No. 75, November 29, 2010
Central Florida Future, Vol. 42 No. 75, November 29, 2010
Central Florida Future
GRE improvement underway; The Sugar Connection; Prof. finds inmates feign mental illness; Video games help students stay active.
The Collegian (2010-11-29), Christine Cavazos
The Collegian (2010-11-29), Christine Cavazos
UTB/TSC Archives - The Collegian [Newspaper]
Vol. 63, No. 14
Loveall, Sandra Kaye, B. 1964 (Fa 486), Manuscripts & Folklife Archives
Loveall, Sandra Kaye, B. 1964 (Fa 486), Manuscripts & Folklife Archives
Folklife Archives Finding Aids
Finding aid and full text (click on "Additional File" below) for Folklife Archives Project 486. Folklore material classified by genre. Information collected by Sandra Kaye Loveall related to folklore genres for a folk studies class at Western Kentucky University.
Power Series For Waves In Micro-Resonator Arrays, Stephen P. Shipman
Power Series For Waves In Micro-Resonator Arrays, Stephen P. Shipman
Faculty Publications
We obtain convergent power-series representations for Bloch waves and their complex dispersion relation in an infinite periodic array of micro-resonators, which exhibits artificial bulk magnetism. The small parameter η of expansion is the ratio of period to wavelength, and the high conductivity is inversely proportional to η. The coefficient fields are solutions to an infinite sequence of period-cell problems.1. © 2010 IEEE.
Grand Valley Forum, Volume 035, Number 14, November 29, 2010, Grand Valley State University
Grand Valley Forum, Volume 035, Number 14, November 29, 2010, Grand Valley State University
2010-2011, Volume 35
Grand Valley Forum is Grand Valley State's faculty and staff newsletter, published from 1976 to the present.
A Bayesian Shared Component Model For Genetic Association Studies, Juan J. Abellan, Carlos Abellan, Juan R. Gonzalez
A Bayesian Shared Component Model For Genetic Association Studies, Juan J. Abellan, Carlos Abellan, Juan R. Gonzalez
COBRA Preprint Series
We present a novel approach to address genome association studies between single nucleotide polymorphisms (SNPs) and disease. We propose a Bayesian shared component model to tease out the genotype information that is common to cases and controls from the one that is specific to cases only. This allows to detect the SNPs that show the strongest association with the disease. The model can be applied to case-control studies with more than one disease. In fact, we illustrate the use of this model with a dataset of 23,418 SNPs from a case-control study by The Welcome Trust Case Control Consortium (2007) …
Florida Sentinel Bulletin, November 29, 2010, Gwen Hayes
Florida Sentinel Bulletin, November 29, 2010, Gwen Hayes
Florida Sentinel Bulletin Collection
The November 29, 2010, issue of the Florida Sentinel Bulletin.
Nuclear Magnetic Resonance Affinity Screening Methods For Functional Annotation Of Proteins And Drug Discovery, Matthew D. Shortridge
Nuclear Magnetic Resonance Affinity Screening Methods For Functional Annotation Of Proteins And Drug Discovery, Matthew D. Shortridge
Department of Chemistry: Dissertations, Theses, and Student Research
With nearly 1,350 complete genome sequences available our understanding of biology at the molecular level has never been more complete. A consequence of these sequencing projects was the discovery of large functionally unannotated segments of each genome. The genes (and proteins they encode) found in these unannotated regions are considered “hypothetical proteins”. Current estimates suggest between 12%-50% of the known gene sequences are functionally unannotated. Incomplete functional annotation of the various genomes significantly limits our understanding of biology. Pragmatically, identifying the functions of these proteins could lead to new therapeutics; making functional annotation of paramount importance.
This dissertation describes the …
Perceptions Of Teachers Regarding The Importance And Existence Of Researched-Based Program Characteristics In Alternative High Schools And Teacher’S Perceptions Of Efficacy In The Commonwealth Of Virginia, Robert Lowerre
Theses and Dissertations
The purpose of this research was to determine teachers’ perceptions of the degree to which research-based characteristics exist in alternative high schools and programs in the Commonwealth of Virginia and the importance of these characteristics to effective education. In addition, this research investigated whether or not these perceptions were related to the teachers’ perception of efficacy. These seven characteristics were (a) clearly identified enrollment criteria, (b) low ratio of student to teachers, (c) one-to-one interactions between staff and students, (d) social skills instruction, (e) effective academic instruction, (f) parental involvement and parental support programs, and (g) specific training for teachers …
Remote Measurements Of On-Road Emissions From Heavy-Duty Diesel Vehicles In California; Year 3, 2010, Brent G. Schuchmann, Gary A. Bishop, Donald H. Stedman
Remote Measurements Of On-Road Emissions From Heavy-Duty Diesel Vehicles In California; Year 3, 2010, Brent G. Schuchmann, Gary A. Bishop, Donald H. Stedman
Fuel Efficiency Automobile Test Publications
No abstract provided.
Detecting Cartels: Price Rigidity And The Application Of The Icss Algorithm, Ping-Ying Cheng
Detecting Cartels: Price Rigidity And The Application Of The Icss Algorithm, Ping-Ying Cheng
Electronic Theses and Dissertations Archive
This paper proposes that the Iterative Cumulative Sums of Squares (ICSS) Algorithm can be applied to help better detect periods of collusive behavior in markets by analyzing changes in the variance of product prices over time. Price rigidity is a common characteristic of oligopolies and has been theoretically proven in many studies. The kinked-demand-curve explains that firms would prefer to stay at the agreed upon monopoly price rather than cutting prices to earn more market share during a single period. An infinitely repeated Bertrand game model developed by Athey, Bagwell, and Sanchirico (2004) claims that if the firms are sufficiently …
Web-Based Intelligent Computational Argumentation Based Conflict Resolution In Air Traffic Management, Xiaoqing Frank Liu, Ravi Santosh Arvapally, Hojong Baik, Rubal Wanchoo
Web-Based Intelligent Computational Argumentation Based Conflict Resolution In Air Traffic Management, Xiaoqing Frank Liu, Ravi Santosh Arvapally, Hojong Baik, Rubal Wanchoo
Computer Science Faculty Research & Creative Works
Collaborative decision making (CDM) is a process of reaching consensus on a potential solution of an issue through the evaluation of the different possible alternatives. the web-Based intelligent computational argumentation system allows concerned stakeholders to post their arguments on different alternatives, assign weights and priorities to the arguments and reach the most favorable alternative using fuzzy intelligent techniques over the Internet. Exchange of information among the stakeholders improves the collaboration and drives towards the collective intelligence. in this paper, we show how our tool facilitates resolution of conflicts in air traffic management. It could enhance the Ground Delay Program (GDP) …
Study On Preparing Technology And Corrosion Resistance Of Ti/Zr Based Chromium-Free Chemical Conversion Coating On Zinc Electroplating Layer, Yong Guan, Jian-Guo Liu, Chuan-Wei Yan
Study On Preparing Technology And Corrosion Resistance Of Ti/Zr Based Chromium-Free Chemical Conversion Coating On Zinc Electroplating Layer, Yong Guan, Jian-Guo Liu, Chuan-Wei Yan
Journal of Electrochemistry
In this paper,we obtained environmental-friendly chromium-free chemical conversion coating on the non-cyanide alkaline zinc electroplating layer by employing the optimized Ti/Zr based conversion technique.At the same time,the performances of the Ti/Zr based conversion coating were compared with chromate colour passivation coating.The corrosion resistances of the conversion coatings were investigated by using neutral salt spray(NSS) test,potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The results showed that the white rust appeared after 96 hours when the NSS test was performed on the Ti/Zr based conversion coating,which was close to the corrosion resistance rating of chromate colour passivation coating.Compared with the chromate passivation coating,the Ti/Zr …
The Sol-Gel Synthesis And Electrochemical Performance Of Li3V2(Po4)3/C Cathode Material For Lithium Ion Battery, Li-Ying Liu, Lian Chen, Hai-Yan Zhang, Yu-Chun Zhai
The Sol-Gel Synthesis And Electrochemical Performance Of Li3V2(Po4)3/C Cathode Material For Lithium Ion Battery, Li-Ying Liu, Lian Chen, Hai-Yan Zhang, Yu-Chun Zhai
Journal of Electrochemistry
Li3V2(PO4)3/C was synthesized by sol-gel method with citric acid as chelate and C sources. Physical and electrochemical performances of as-prepared materials were characterized through XRD, SEM and galvanostatic charge-discharge tests,etc. The results showed that products produced by calcining at 800 ℃ for 12 h had a single phase crystal structure and relatively small particle sizes with uniform distribution. At 0.1 C, 0.5 C and 1 C, the initial specific discharge capacities were 153.0, 143.1 and 130.6 mAh·g-1, respectively, and capacity efficiencies were 93.1%, 85.4% and 77.3% after 50 cycles, respectively. …
The Roles Of The Width Of Gas/Liquid/Solid Three-Phase Boundary Zone Of Dispersion Water Films In Atmospheric Corrosion Of Metals, Jia Wang, Jing Jiang
The Roles Of The Width Of Gas/Liquid/Solid Three-Phase Boundary Zone Of Dispersion Water Films In Atmospheric Corrosion Of Metals, Jia Wang, Jing Jiang
Journal of Electrochemistry
The roles of TPB(Three-Phase Boundary) width in the corrosion processes of metals under dispersed water films were investigated by electrochemical techniques combined with contact angle measurement.It is found that both cathodic limiting current density and corrosion current density linearly increases with increasing the TPB width,confirming the important role of TPB width in gas/liquid/solid multiphase corrosion systems.Based on above results,the effect of water film thickness on atmospheric corrosion rate was quantitatively evaluated by the TPB width.
Comparative Studies On The Deterioration Process Of Organic Coatings Under Immersed And Cyclic Wet-Dry Conditions By Eis, Yu-Nan Li, Jia Wang, Wei Zhang
Comparative Studies On The Deterioration Process Of Organic Coatings Under Immersed And Cyclic Wet-Dry Conditions By Eis, Yu-Nan Li, Jia Wang, Wei Zhang
Journal of Electrochemistry
Under the immersed and wet-dry cyclic conditions,the deterioration processes of the organic coatings on carbon steel surface have been comparatively studied by using electrochemical techniques.The wet-dry cycles were carried out in the alternating conditions of 12 h by immersing in a 3.5% sodium chloride solution and drying at 25 ℃ and 50% RH.Coating resistance,Rf,coating capacitance,Cf,and double layer capacitance,Cd,were monitored continuously and separately under above two conditions.The percentages of the intenfacial active area,Aw,were estimated from the obtained double layer capacitance,Cd.According to the EIS characteristics,the entire deterioration processes under above two mentioned conditions can be divided into three main stages,consisting of the …
Electrochemical Behaviors Of Organic Coating/Matal Substrate Under Simulated Deep Sea Environment Partⅰ.Effects Of Seawater Pressure On Transportation Behavior Of Water Through Coating And Coating′S Protective Performance, Bin Liu, Zhi-Gang Fang, Tao Wang, Hong-Bin Wang
Electrochemical Behaviors Of Organic Coating/Matal Substrate Under Simulated Deep Sea Environment Partⅰ.Effects Of Seawater Pressure On Transportation Behavior Of Water Through Coating And Coating′S Protective Performance, Bin Liu, Zhi-Gang Fang, Tao Wang, Hong-Bin Wang
Journal of Electrochemistry
By means of electrochemical impedance spectroscopy(EIS),the electrochemical behaviors of organic coating/metal substrate were studied under simulated deep sea environment in the laboratory.Effects of seawater pressure on the transportation behavior of water through coating and the protective performance of coating were analyzed.The experimental results showed that,compared to normal pressured seawater,there were different impedance characteristics of coating in 3.5 MPa pressured seawater.The main observations were that high seawater pressure accelerated the process of water uptake and invalidation of coating,increased water absorption,and lowered the anti-corrosion property of coating.
Photoelectrochemical Properties Of N, S, And Cl Modified Nano Tio2 Thin Films, Hong Yun, Chang-Jian Lin, Jing Li, Rong-Gui Du
Photoelectrochemical Properties Of N, S, And Cl Modified Nano Tio2 Thin Films, Hong Yun, Chang-Jian Lin, Jing Li, Rong-Gui Du
Journal of Electrochemistry
The nitrogen(N),sulfur(S) and chlorine(Cl) modified nano TiO2 thin films were prepared by adding Ti(O-n-Bu)4 as the precursor into concentrated HNO3,H2SO4 and HCl Solutions,respectively,on different substrates in a sol-gel process.The photoelectrochemical performances of N,S and Cl modified nano TiO2 thin films have been studied by UV-vis(DRS),photocurrent curves,EIS and OCP-time curves.N-modified TiO2 nano films show better surface structure,which helps to improve the quantum efficiency of nano TiO2 thin films.
Corrosion Electrochemical Behavior Of Am60 Magnesium Alloys In Automobile Engine Coolants, Ling-Jie Li, Sha Wang, Yin Xiao, Jun Lan, Jing-Lei Lei, Sheng-Tao Zhang, Fu-Sheng Pan
Corrosion Electrochemical Behavior Of Am60 Magnesium Alloys In Automobile Engine Coolants, Ling-Jie Li, Sha Wang, Yin Xiao, Jun Lan, Jing-Lei Lei, Sheng-Tao Zhang, Fu-Sheng Pan
Journal of Electrochemistry
The polarization measurements and electrochemical impedance spectroscopy(EIS) were used to study the corrosion electrochemical behavior of AM60 magnesium alloys in three kinds of commercial coolants for automobile engine.Results show that the tested commercial coolants are slightly corrosive to AM60 magnesium alloys and their corrosivity varies from coolant to coolant.The coolant C is the least corrosive among the studied commercial coolants and the coolant A is more corrosive than the coolant B and C.The coolant C appears to be the most promising coolant for automobile engine made by magnesium alloys.The coolant resistivity plays an important role in the corrosion of AM60 …
Study On Aluminum Foils For Aluminum Electrolytic Capacitor, Hui-Zhong Tan, Guo-Qing Qian, Wen-Bao Wang, Lan Sun, Chang-Jian Lin
Study On Aluminum Foils For Aluminum Electrolytic Capacitor, Hui-Zhong Tan, Guo-Qing Qian, Wen-Bao Wang, Lan Sun, Chang-Jian Lin
Journal of Electrochemistry
Scanning electron microscopy(SEM),X-ray diffraction(XRD),weight-loss method and electrochemical testing method were employed to study the chemical compositions and corrosion behaviors of hard foil and soft foil.The results showed that the surface morphology,chemical composition and crystal structure of hard foil and soft foil are different.It is found from electrochemical tests that the soft foil is suitable to the corrosion under low acidity conditions,which provides the base for developing the corrosion techniques under low acidity conditions.
Frequency Dependence In The Initiation Of Ultrafast Laser-Induced Damage, Jeremy R. Gulley
Frequency Dependence In The Initiation Of Ultrafast Laser-Induced Damage, Jeremy R. Gulley
Faculty Articles
Numerous studies have investigated the role of photoionization in ultrafast laser-induced damage of bulk dielectrics. This study examines the role of spectral width and instantaneous laser frequency in laser-induced damage using a frequency dependent multiphoton ionization model and numerical simulation of an 800 nm laser pulse propagating through fused silica. When the individual photon wavelengths are greater than 827 nm, an additional photon is required for photoionization, reducing the probability of the event by many orders of magnitude. Simulation results suggest that this frequency dependence may significantly affect the processes of laser-induced damage and filamentation.
Testing Coupling Relationships In Object-Oriented Programs, Roger Alexander, Jeff Offutt, Andreas Stefik
Testing Coupling Relationships In Object-Oriented Programs, Roger Alexander, Jeff Offutt, Andreas Stefik
All Faculty Scholarship for the College of the Sciences
As we move toward developing object‐oriented (OO) programs, the complexity traditionally found in functions and procedures is moving to the connections among components. Different faults occur when components are integrated to form higher‐level structures that aggregate the behavior and state. Consequently, we need to place more effort on testing the connections among components. Although OO technologies provide abstraction mechanisms for building components that can then be integrated to form applications, it also adds new compositional relations that can contain faults. This paper describes techniques for analyzing and testing the polymorphic relationships that occur in OO software. The techniques adapt traditional …
Electrochemical Detection For The Corrosion Of Reinforcing Steel In Concrete During Immersion And Drying Cycles, Bing-Li Jia, Fa-He Cao, An-Na Chen, Jian-Qing Zhang
Electrochemical Detection For The Corrosion Of Reinforcing Steel In Concrete During Immersion And Drying Cycles, Bing-Li Jia, Fa-He Cao, An-Na Chen, Jian-Qing Zhang
Journal of Electrochemistry
The corrosion behavior of reinforcing steel in concrete under dry-wet cycle condition has been studied by electrochemical noise(EN) compared with the electrochemical impedance spectroscopy(EIS),SEM micrographs and EDS.The statistical method has been employed to analyze the EN data of reinforcing steel in concrete,which revealed three different corrosion stages of reinforcing steel in concrete,including the dissolution of the passive film,the active corrosion and the cumulation of corrosion product.The wavelet transform has also been employed,which indicated that steel in concrete with pH 1 is associated with uniform corrosion,while steel in concrete with pH 3 and pH 7 are associated with localized corrosion,such as …
Preparation And Characterization Of The Silane-Phosphonic Acid Composite Passivation Coating For Electrogalvanized Steel, Yong Guan, Jian-Guo Liu, Chuan-Wei Yan
Preparation And Characterization Of The Silane-Phosphonic Acid Composite Passivation Coating For Electrogalvanized Steel, Yong Guan, Jian-Guo Liu, Chuan-Wei Yan
Journal of Electrochemistry
A new silane-phosphonic acid composite passivation coating process has been developed for the protection of electrogalvanized steel based on N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane(AAPTMS),γ-(2,3-epoxypropoxy)propyltrimethoxy-silane(GPTMS) and 1-hydroxy ethylidene-1,1-diphosphonic acid(HEDP).The results of X-ray photoelectron spectroscopy(XPS),Fourier transform infrared spectroscopy(FTIR),potentiodynamic polarization scan,electrochemical impedance spectroscopy(EIS) and neutral salt spray(NSS) tests indicated that the major structure of the prepared silane-phosphonic acid composite passivation coating consisted mainly of Si—O—Si and Si—O—P bonds.The area of white rust was not more than 5% of the total panal after 120 h NSS test,which could be compared favourably with the chromate colour passivation coating.However,the corrosion reaction on the anode of the silane-phosphonic acid composite passivation …