Theory of Computing Systems \/ Mathematical Systems Theory最新文献

{"title":"Structural Transformations in Diluted Micellar and Lamellar Systems","authors":"Blanca Zelaya-Rincon","doi":"10.23860/thesis-zelaya-rincon-blanca-2017","DOIUrl":"https://doi.org/10.23860/thesis-zelaya-rincon-blanca-2017","url":null,"abstract":"................................................................................................................. ii ACKNOWLEDGMENTS .......................................................................................... iii TABLE OF CONTENTS ........................................................................................... iv LIST OF TABLES ........................................................................................................ v LIST OF FIGURES .................................................................................................... vi CHAPTER 1 ..................................................................................................................","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"29 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82735858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of Dimensionless Scaling Relationships for Rotating Free Flight Bodies","authors":"Shawn A. Smearcheck","doi":"10.33915/etd.6659","DOIUrl":"https://doi.org/10.33915/etd.6659","url":null,"abstract":"Analysis of Dimensionless Scaling Relationships for Rotating Free Flight Bodies","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"1 1","pages":"15"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88298471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Experimental Investigation of the Cooling System for a Free Piston Stirling Engine","authors":"A. Gupte","doi":"10.33915/ETD.3706","DOIUrl":"https://doi.org/10.33915/ETD.3706","url":null,"abstract":"","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"49 1","pages":"36"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74444559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Scalability of Smoke Density and the Viability of New Detection Methods in Aircrafts","authors":"Selena K. Chin","doi":"10.13016/DSFP-D10N","DOIUrl":"https://doi.org/10.13016/DSFP-D10N","url":null,"abstract":"","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"18 1","pages":"53"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74493523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New Method of Nickel Oxide as Hole Transport Layer and Characteristics of Nickel Oxide Based Perovskite Solar Cell","authors":"L. Nguyen","doi":"10.25776/8DX3-KZ45","DOIUrl":"https://doi.org/10.25776/8DX3-KZ45","url":null,"abstract":"NEW METHOD OF NICKEL OXIDE AS HOLE TRANSPORT LAYER AND CHARACTERISTICS OF NICKEL OXIDE BASED PEROVSKITE SOLAR CELL Loi Nguyen Old Dominion University, 2018 Director: Dr. Gon Namkoong For perovskite solar cells, poly (2,3-dihydrothieno-1, 4-dioxin)-poly (styrenesulfonate) (PEDOT:PSS) is a common hole transport layer. However, PEDOT:PSS has a lot of drawbacks, such as irregular quality from distributors, poor electron blocker, and hygroscopic nature. On the other hand, NiOx has been reported that it can provide good stability and carrier mobility. From literature, NiOx was used to replace PEDOT:PSS as a hole transport layer with positive results since it is transparent as a thin film and also possesses compatible work function in perovskite solar cell bandgap alignment. In depositing NiOx as a thin film, many approaches have been developed. However, those approaches required the use of acute toxic chemicals, lengthy processing time, complicated chemical requirement, and/ or expensive equipment. In order to obtain NiOx thin film as a hole transport layer, we have developed a facile method to obtain a thin film of NiOx by simply mixing NiOx powder and HCl solution. This process only needs less than 5 minutes of chemical mixing time and the precursor can be immediately spin-coated on top of substrate. In addition, the equipment needed to obtain thin film NiOx is a spin coater and a hot plate. With our quick, simple and inexpensive approach to get NiOx thin film for perovskite solar cells with inverted p-i-n structure, it is found that inverted perovskite solar cell with NiOx as a hole transport layer demonstrated higher open circuit voltage than perovskite solar cell fabricated with PEDOT:PSS, which enhanced solar cell power conversion efficiency. Our experiment has shown that NiOx thin film obtained by newly developed technique, exhibited promising material characteristics such as long lifetime decay. In our experiment, we also optimized the processing conditions of NiOx thin films to remove the light soaking effect caused by defects in NiOx layer. Hence, it is found that a quick, simple and inexpensive method enabled deposition of NiOx thin film as a promising hole transport layer for inverted p-i-n structure of perovskite solar cell.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"8 1","pages":"7"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91244730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Gellan gum based thiol-ene hydrogels with tunable properties for use as tissue engineering scaffolds","authors":"Zihao Xu","doi":"10.31274/etd-180810-6123","DOIUrl":"https://doi.org/10.31274/etd-180810-6123","url":null,"abstract":"Gellan gum is a naturally occurring polymer that can crosslink in the presence of divalent cations to form biocompatible hydrogels. However, physically crosslinked gellan gum hydrogels lose stability under physiological conditions, which substantially limits the applications of these hydrogels in vivo. In order to improve the mechanical strength, we incorporated methacrylate into gellan gum and chemically crosslinked the hydrogel through three polymerization methods: step growth through thiol-ene photoclick chemistry, chain growth via photopolymerization, and mixed model in which both mechanisms were employed. Methacrylation was confirmed and quantified by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR). The mechanical property and chemistry of the crosslinked gels were systematically explored by varying the reaction conditions. The swelling ratios of the hydrogels were correlated with the compression moduli and affected by the addition of calcium. In vitro enzymatic degradation rate was found dependent on the degree of methacrylation. NIH/3T3 fibroblast cell proliferation and morphology were related to substrate stiffness with high stiffness leading generally to higher proliferation. The proliferation is further affected by the thiol-ene ratios. We then further modified methacrylate Gellan gum with alkane bromide to increase hydrophobicity. Cell attachment on resultant hydrogels were assessed and imaged. Cytokine release was also measured with comparison to pristine methacrylated Gellan gum based hydrogels. The results suggest that a hydrogel platform based on gellan gum can offer versatile chemical modifications and tunable mechanical properties for a variety of biomaterials applications, such as the wound healing scaffold.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"88 6 1","pages":"2"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84056257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Cost Effective Design for a Propeller Thrust/Torque Balance","authors":"N. Sadowski","doi":"10.25777/F8MC-9C26","DOIUrl":"https://doi.org/10.25777/F8MC-9C26","url":null,"abstract":"A COST EFFECTIVE DESIGN FOR A PROPELLER THRUST/TORQUE BALANCE Nicholas Barrett Sadowski Old Dominion University, 2018 Director: Dr. Drew Landman Wind tunnel balances are used with aircraft models, propellers, and components to measure applied forces and moments. The design and manufacture of a balance is often for a specific test, test article and conditions. This paper discusses the theory, design, calibration, and testing of a new small propeller balance for use in a low-speed wind tunnel. The new balance is named the ODU15X15. Theory discussed herein covers how the two measurement components, thrust and torque, affect the balance design. These loads generate strains which are in turn read by strain gages arranged in Wheatstone bridges. The design follows well known practices established at NASA Langley for single-piece balances. Design considerations include constraints on geometry shape/size, thermal compensation, vibration inputs, balance sensitivity requirements, and safety. Analysis of the balance is performed using solid computer aided design models and iterative finite element analysis. Goals for this design were to create a cost effective balance, made using only conventional machining, made out of a single billet or section of tubing, and to create a balance capable of measuring loads more accurately then those commercially available for the relatively low loads predicted. The ODU15X15 is designed to read 15 lbs thrust and 15 in-lbs torque. Calibration, including theory, set-up, design, and procedures, follows the principles of Design of Experiments. A LabView code is used to record voltage outputs from Wheatstone bridges with known loads applied to the balance. Fixtures are used to apply the static thrust and torque loads. Calibration of the balance resulted in less than ±0.1% full-scale error at a ninety five percent confidence level. Confirmation points provided additional assurance of model adequacy. Wind tunnel trials were performed with a Scorpion SII-4020-420kv motor, and a 3 blade 16 X 8 Master Airscrew propeller at conditions representative of previous testing with NASA GL-10 propeller candidates. While further testing is needed, results indicate that the balance performance was superior to the commercial load cell.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"212 0 1","pages":"26"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77089191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Integrated Model for the Probabilistic Prediction of Yield Strength in Electron-Beam Additively Manufactured Ti-6Al-4V","authors":"T. Ales","doi":"10.31274/ETD-180810-5937","DOIUrl":"https://doi.org/10.31274/ETD-180810-5937","url":null,"abstract":"A complete model for the prediction of the yield strength of Titanium 6Al-4V in an additively manufactured component is presented herein. A thermal model is presented utilizing the ABAQUS simulation software to provide the process leg of the materials tetrahedron. The thermal model is fed into an implementation of the Langmuir equation that has been adapted for use in the simulation of the Electron-Beam Additive Manufacturing (EBAM) process. The predicted chemistry provided by the Langmuir equation for the Ti-6Al-4V alloy is then used in a phenomenological equation for the prediction of yield strength; a design probability curve is generated through random sampling of the thermal model. Using Weibull probability distributions, the model is verified against a rich mechanical and chemical database built from an actual EBAM build used in previous research.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"13 1","pages":"15"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88448189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Modular Multi-Level Converter for Energy Management of Hybrid Energy-Storage Systems in Electric Vehicles","authors":"Sharon George","doi":"10.31979/etd.94h5-2h6q","DOIUrl":"https://doi.org/10.31979/etd.94h5-2h6q","url":null,"abstract":"","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"21 1","pages":"30"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73376012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of compliant mechanism lattice structures for impact energy absorption","authors":"Joel C. Najmon","doi":"10.7912/C2NQ1Z","DOIUrl":"https://doi.org/10.7912/C2NQ1Z","url":null,"abstract":"","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"5 1","pages":"31"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82562400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}