Дисертації з теми "Strain release"
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Vijayaraghavan, Rajesh. "Statistical estimation of strain energy release rate of delaminated composites." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4965.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains xv, 133 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 126-133).
Elliott, John. "Strain accumulation & release on the Tibetan Plateau measured using InSAR." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526560.
Повний текст джерелаLai, Yeh-Hung. "The constrained blister - a nearly constant strain energy release rate test for adhesives." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/44077.
Повний текст джерелаThis study developed and analyzed a modification of the blister test permitting nearly constant strain energy release rate testing of adhesive bonds. The work consisted of three parts; (1) development of the testing technique to evaluate strain energy release rate and to record the time dependent nature of the fracture process, (2) numerical analysis of the constrained blister test to determine the applicability of an approximate solution for several materials, and (3) development of an. analytical technique to evaluate the strain energy release rate for relatively stiff specimens.
Master of Science
Wilson, Mary Elizabeth. "Techniques for Using Internal Strain-Energy Storage and Release inOrigami-Based Mechanical Systems." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7730.
Повний текст джерелаSuansuwan, Napa. "Application Of Strain Energy Release Rate To Characterise The Adhesion At Ceramic-Metal Interfaces." Thesis, The University of Sydney, 2001. http://hdl.handle.net/2123/4865.
Повний текст джерелаChadegani, Alireza. "Strain energy release rate analysis of adhesive-bonded composite joints with a prescribed interlaminar crack." Thesis, Wichita State University, 2008. http://hdl.handle.net/10057/2023.
Повний текст джерелаThesis [M.S] - Wichita State University, College of Engineering, Dept. of Aerospace Engineering
Chadegani, Alireza Yang Charles. "Strain energy release rate analysis of adhesive-bonded composite joints with a prescribed interlaminar crack." A link to full text of this thesis in SOAR, 2008. http://hdl.handle.net/10057/2023.
Повний текст джерелаLe, Thanh Roderic. "ADHESION OF VENEERING PORCELAIN TO ZIRCONIUM DIOXIDE CERAMIC AS DETERMINED BY THE STRAIN ENERGY RELEASE RATE." Thesis, Faculty of Dentistry, 2010. http://hdl.handle.net/2123/5932.
Повний текст джерелаMokarem, David W. "Environmental Influence on the Bond Between a Polymer Concrete Overlay and an Aluminum Substrate." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31700.
Повний текст джерелаMaster of Science
Klein, Justin. "A Study of Durability for Elastomeric Fuel Cell Seals and an Examination of Confinement Effects in Elastomeric Joints." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32666.
Повний текст джерелаMaster of Science
Zhang, Huiying. "An Evaluation of the Durability of Polymer Concrete Bonds to Aluminum Bridge Decks." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/31655.
Повний текст джерелаMaster of Science
Salado, Martinez Freddie Antonio. "Assessment of Fracture Resistance of Asphalt Overlays through Heavy Vehicle Simulator and Laboratory Testing: Synthetic Fiber and Rubber Modified SMA Mixes." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/98576.
Повний текст джерелаDoctor of Philosophy
Reflective cracking can reduce the life of a pavement by allowing water or other particles to get into the underlying layers, which causes the pavement structure to lose strength. To improve the performance of the composite pavement, road agencies have studied mitigations techniques that will delay the initiation and propagation of those cracks reflected from the PCC joints. Traditionally, these studies rely only on laboratory testing or nondestructive tests that will assist in the decision-making stage in a short time manner. This dissertation focusses on a reflective cracking study conducted through Accelerate Pavement Testing (APT) using a Heavy Vehicle Simulator (HVS) and laboratory testing. The first task used an HVS to evaluate reflective cracking of a Stone Matrix Asphalt (SMA) control mix and a modified mix with synthetic fiber. One lane was constructed with two layers of 1.5-inches of a control Stone Matrix Asphalt (SMA) mix and the second lane with an SMA mix modified with the synthetic fiber. Results from APT demonstrated that the modified SMA has a higher resistance to fracture which increases the pavement life by approximately 50%. The second task estimated the fracture resistance of the mixes studied in task one following the laboratory test: Indirect Tension Asphalt Cracking Test (IDEAL-CT), Texas Overlay Test (OT), Semi-Circular Bend-Louisiana Transportation Research Center (SCB-LTRC) and Semi-Circular Bend-Illinois (SCB-IL) to estimate the Cracking Test Index (CTindex), Cracking Propagation Rate (CPR), critical strain energy release rate (Jc) and Flexibility Index (FI), respectively. Results showed that the modified mix had a better resistance to cracking, confirming the APT test results. Specifically, CTindex results showed that the modified mix is more resistant than the control, with indices of 268.72 and 67.86. The estimated Jc indicated that less energy is required to initiate a crack for the control mix that achieved 0.48 kJ/m2 compared to the modified mix with synthetic fibers 0.54 kJ/m2. FI results for the control and fibers were 2.16 and 10.71, respectively. The calculated CPR showed that the control mix propagates a crack at a higher rate of 0.188 compared to the modified mix with a CPR of 0.152. The third phase evaluated the performance of mixes designed with a high content of Reclaimed Asphalt Pavement (RAP) and an enhanced asphalt-rubber extender, which comprises three primary components: plain soft bitumen, fine crumb rubber and an Activated Mineral Binder Stabilizer (AMBS). The experiment evaluated the fracture resistance of nine mixes designed with different rates of recycled asphalt pavement (RAP) and asphalt-rubber, compare them with a traditional mix, and propose an optimized mixture for use in overlays of concrete pavements. The mixes were designed with different rates of RAP (15, 30, 45%) and asphalt-rubber extender (0, 30, and 45%) following generally, the design requirements for an SMA mix in Virginia. The laboratory test recommended in the second experiment, IDEAL-CT and SCB-IL, were used to determine the fracture resistance of the mixes. The results showed that the addition of RAP decreases fracture resistance, but the asphalt-rubber extender improves it. A mix designed that replaced 30% of the binder with asphalt-rubber extender and 15% RAP had the highest resistance to fracture according to both. Also, as expected, all the mixed had a low susceptibility to rutting.
Murray, Katie Virginia. "Characterization of the Interfacial Fracture of Solvated Semi-Interpenetrating Polymer Network (S-IPN) Silicone Hydrogels with a Cyclo-Olefin Polymer (COP)." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/31918.
Повний текст джерелаInterfacial fracture data was collected through the application of the wedge test, a relatively simple test allowing for the measurement of fracture properties over time in environments of interest. In this case, the test was performed at discrete temperatures within range of 4Ë C to 80Ë C. Two COP adherends were bonded together by a layer of one of the S-IPN silicone hydrogels. Upon the insertion of a wedge between the two adherends, debonding at one of the two interfaces would initiate and propagate at a decreasing rate. Measurements were taken of the debond length over time and applied to develop crack propagation rate versus strain energy release rate (SERR) curves. The SERR values were determined through the application of an analytical model derived for the wedge test geometry and to take into account the effects of the hydrogel interlayer. The time-temperature superposition principle (TTSP) was applied to the crack propagation rate versus SERR curves by shifting the crack propagation rates with the Williams-Landel-Ferry (WLF) equation-based shift factors developed for the bulk behavior of each hydrogel. The application of TTSP broadened the SERR and crack propagation rate ranges and presented a large dependency of the adhesion of the system on the viscoelastic nature of the hydrogels. Power-law fits were applied to the master curves in order to determine parameters that could describe the adhesion of the system and be applied in the development of a finite element model representing the interfacial fracture that occurs for each system. The finite element models were used to validate the analytical model and represent the adhesion of the system such that it could be applied to future geometries of interest in which the S-IPN silicone hydrogels are adhered to the COP substrate.
[Files modified per J. Austin, July 9, 2013 GMc]
Master of Science
Scalone, Santiago Andres. "A numerical evaluation of mode I & II damage propagation in composite materials." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15914/.
Повний текст джерелаKrieger, William E. R. "Cohesive zone modeling for predicting interfacial delamination in microelectronic packaging." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51888.
Повний текст джерелаSingh, Hitendra Kumar. "Lifetime Prediction and Durability of Elastomeric Seals for Fuel Cell Applications." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27658.
Повний текст джерелаPh. D.
Kulkarni, Anish Niranjan. "Energy and Strength-based Criteria for Intralaminar Crack Growth in Regions with High Stress Gradients." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-87384.
Повний текст джерелаDavis, Kedzie. "The effect of cooling rate on toughness and crystallinity in poly(ether ketone ketone) (PEKK)/G30-500 composites." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063310/.
Повний текст джерелаGüngör, Güven. "Biaxial Load Effects on Fatigue Properties." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19079/.
Повний текст джерелаGuraydin, Alec D. "Analysis of Bimetallic Adhesion and Interfacial Toughness of Kinetic Metallization Coatings." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/979.
Повний текст джерелаParvatareddy, Hari. "Durability of Polyimide Adhesives and Their Bonded Joints for High Temperature Applications." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29554.
Повний текст джерелаPh. D.
Pohlit, David Joseph. "Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33837.
Повний текст джерелаMaster of Science
Guan, Youliang. "Crack path selection and shear toughening effects due to mixed mode loading and varied surface properties in beam-like adhesively bonded joints." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/24905.
Повний текст джерелаPh. D.
Vodička, Vít. "Interlaminární lomová houževnatost vláknových kompozitních materiálů s polymerní matricí." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231461.
Повний текст джерелаLin, Y. "Optimum design for sustainable 'green' overlays : controlling flexural failure." Thesis, Coventry University, 2014. http://curve.coventry.ac.uk/open/items/b5ba73e5-9cb8-4a0b-ac99-c53b3c3e54ed/1.
Повний текст джерелаDixon, Charles E. "Evaluation of the Effects of Single Season Wild-Strain Mallard Releases on Local Breeding Population Densities." DigitalCommons@USU, 2000. https://digitalcommons.usu.edu/etd/4528.
Повний текст джерелаFenton, Jenny. "Post-Release Survival and Habitat Utilization of Juvenile Swordfish in the Florida Straits." NSUWorks, 2012. http://nsuworks.nova.edu/occ_stuetd/191.
Повний текст джерелаBERGAMINI, Gabriella. "Identification of Pseudomonas aeruginosa released proteins: effects of oxygen limitation and azithromycin treatment in clinical and laboratory strains." Doctoral thesis, Università degli Studi di Verona, 2010. http://hdl.handle.net/11562/343980.
Повний текст джерелаColonization by Pseudomonas aeruginosa (Pa) is a hallmark of lung disease in cystic fibrosis (CF), where microaerobic conditions develop as a consequence of disease progression. Conditioned medium (CM) obtained from Pa clinical strain AA2, unlike the CM from laboratory strain PAO1, induces in airway epithelial cells IL-8 mRNA in both aerobic and microaerobic conditions. The effect was impaired by protease digestion. Shotgun proteomic analysis (Multidimensional protein identification technology: MudPIT) of conditioned medium of PAO1 and AA2 identified 451 and 235 individual proteins. Various proteins were found differentially regulated between strains and culture conditions. Among these eleven different proteases were found released by the AA2 strain, while fewer peptides of only four of them were detected in the PAO1 strain. Ecotin, a protease inhibitor, was found to be highly represented in PAO1 in comparison with AA2 grown in microaerobiosis. These results were confirmed by functional assay (zymography) and western blotting. The pattern of expression of several proteases and their inhibitor ecotin correlates with pro-inflammatory activity in vitro better than other candidate virulence factors. Only 31% of the Pa strains isolates from chronically infected CF patients expressed detectable metalloprotease activity while all the isolates derived from sporadically infected individuals scored positive (individual strains analyzed: 42, p<0.002). These results suggest that high-throughput approaches are critical to unravel the complexity of the pro-inflammatory microenvironment associated to the presence of Pa and to facilitate the identification of key molecules involved in Pa biology/pathology. There is considerable interest in the use of azithromycin (AZM) for the treatment of lung disease in patients with cystic fibrosis. Although its mechanism of action as an inhibitor of bacterial protein synthesis has been well established, it is less clear how AZM ameliorates the lung disease associated with P. aeruginosa, which is considered to be resistant to the drug. Modulation of Pa virulence factors was suggested as mechanism for AZM beneficial effects in CF patients. We tested the effects of azithromycin on clinical isolate AA2 to establish how this drug might interfere with the production of bacterial virulence factors that are relevant to the pathogenesis of airway disease in CF patients. We demonstrated that the increase of IL-8 mRNA in CF epithelial cells induced by CM from AA2 was significantly reduced when the clinical strain was grown in the presence of AZM, suggesting that this macrolide reduces Pa pathogenicity. In the attempt to gain information on the identity of the molecules released by Pa clinical strain before and after treatment with AZM we applied MudPIT. We found 5 upregulated and 7 downregulated proteins in CM from AA2 incubated with AZM. Peptides from the alkaline metalloproteinase precursor (APR) were less represented in CM derived from AA2 strain grown in presence of AZM than in those from the same strain cultured in absence of this macrolide. AZM was observed also to decrease the metalloprotease activity and APR expression in CM of Pa isolates derived from sporadically infected individuals while any effect was detected in CM of Pa isolates from chronically infected CF patients. These results was validated by means of zymography assay and western blot technique. The MudPIT analysis of released proteins from Pa clinical isolate grown alone and in presence of AZM gives suggestion on the macrolide ability to decrease the expression of substances that contributes to Pa virulence, such as alkaline metalloproteinase. The effects of AZM on the expression and release of selected polypeptides by Pa strains may help to explain the clinical benefits associated with macrolide therapy.
Odom, Rachel. "The next "killer" algae? Assessing and mitigating invasion risk for aquarium strains of the marine macroalgal genus Chaetomorpha." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5363.
Повний текст джерелаM.S.
Masters
Biology
Sciences
Biology
Momeni, Amir Farid. "Effect of concrete properties and prestressing steel indentation types on the development length and flexural capacity of pretensioned concrete members." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32682.
Повний текст джерелаCivil Engineering
Robert J. Peterman
A study was conducted to determine the effect of different concrete properties and prestressing steel indentation types on development length and flexural capacity of pretensioned members. Wires and strands commonly used in the manufacturing of prestressed concrete railroad ties worldwide were selected for the study. Thirteen different 5.32-mm-diameter prestressing wire types and six different strands (four, seven-wire strands and two, three-wire strands) were used to cast prisms with a square cross section. The ratio of concrete to prestressed steel in the test prism’s cross section was representable of typical concrete railroad ties. Thus, geometrical and mechanical properties of test prisms were representative of actual ties in the railroad industry. To understand the effect of concrete-release strengths and slumps on development length, all parameters were kept constant in the prisms except concrete-release strength and slump. To manufacture prisms with different release strengths, all four wires/strands were pulled and detensioned gradually when the concrete compressive strength reached 3500 (24.13 MPa), 4500 (31.03 MPa), and 6000 (41.37 MPa) psi. To determine the effect of different slumps on development length, prisms with different slumps of 3 in. (7.6 cm), 6 in. (15.2 cm), and 9 in. (22.9 cm) were manufactured and all other parameters were kept constant in prisms. All prisms were tested in three-point bending at different spans to obtain estimations of development length based on type of reinforcement, concrete-release strength, and concrete slump. Lastly, a design equation was developed based on experimental data for prediction of development length. In the last phase of load tests, cyclic-loading tests were conducted on the prisms manufactured with wires to evaluate the bond performance of wires with different indentation types under cyclic loading. A total of 210 load tests, including 14 cyclic tests, were conducted. The monotonic-load tests revealed a large difference in the development length of pretensioned concrete members manufactured with different wire/strand types and different concrete-release strengths. Also, the cyclic-load tests revealed a significant difference in bond performance of different wire types under cyclic loading compared to monotonic loading.
高山, 昇三, Shozo TAKAYAMA, 正人 吉田, Masato YOSHIDA, 剛. 奥山 та Takashi OKUYAMA. "未成熟材における圧縮成長応力発生へのミクロフィブリル傾角の寄与". 名古屋大学農学部付属演習林, 2001. http://hdl.handle.net/2237/8515.
Повний текст джерелаTampau, Alina. "Carvacrol encapsulation by electrospinning or solvent casting to obtain biodegradable multilayer active films for food packaging applications." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/140313.
Повний текст джерела[CAT] L'ús massiu de plàstics sintètics i el seu impacte mediambiental obliga a buscar alternatives biodegradables per a l'envasament dels aliments necessari per a la seua conservació.Així mateix,la necessitat d'incrementar la vida útil dels aliments ha despertat gran interés en el desenvolupament de materials actius(antimicrobians i antioxidants)que mantinguen la seua qualitat i seguretat per més temps,per mitjà de l'ús de compostos d'origen natural,segurs per al consumidor.En este sentit,el desenvolupament de materials biodegradables actius per a l'envasament d'aliments constituïx un repte important per a la indústria alimentària.En la present Tesi Doctoral,s'ha estudiat l'encapsulació de carvacrol per mitjà de l'electroestirat o extensió i assecat de diferents dissolucions polimèriques amb carvacrol.S'han utilitzat polímers biodegradables portadors de diferent polaritat(midó termoplàstic:TPS, polivinil-alcohol:PVA, policaprolactona:PCL o àcid poliláctic:PLA)dissolts en el solvent adequat,a fi d'obtindre capes actives.Estes s'han combinat amb altres de polímers amb propietats complementàries,per a obtindre laminats actius adequats per a l'envasament d'aliments.Els laminats van combinar polímers polars(TPS o PVA)i poliésters no polars(PCL o PLA)incorporant el carvacrol en una de les capes.Es va avaluar la cinètica d'alliberament de l'actiu,així com l'acció antimicrobiana dels materials obtinguts.Els laminats es van caracteritzar en la seua funcionalitat com a material d'envàs(propietats de barrera, mecàniques o òptiques),així com en la seua estructura i comportament tèrmic.Els estudis d'encapsulació van revelar un major potencial encapsulant del carvacrol per als polímers no polars(PCL i PLA),encara que el PVA va mostrar també una bona afinitat amb el compost actiu.La matriu de PVA va mostrar una major retenció de carvacrol per mitjà d'electroestirat de les seues dissolucions aquoses que per extensió i assecat,sense necessitat d'addició de tensioactius com el Tween 85.Per a l'encapsulació en PLA,es van usar mescles binàries de solvents aptes per a contacte amb els aliments(acetat d'etil i DMSO).Es va obtindre una major eficiència encapsulant del PLA en els materials obtinguts per extensió i assecat que en els electroestirats.La cinètica d'alliberament del carvacrol de les fibres de PCL va explicar el major efecte antibacterià contra Escherichia coli,i l'escàs efecte antilisteria.La velocitat d'alliberament de l'actiu va augmentar quan va disminuir la polaritat dels simulants alimentaris,mostrant un alliberament complet en els sistemes no polars, però només fins a un 75% en els sistemes aquosos,que requeririen una major proporció de l'actiu en l'envàs per a potenciar la seua efectivitat.La combinació de làmines de TPS amb fibres de PCL carregades amb carvacrol va donar lloc a materials amb una permeabilitat al vapor d'aigua millorada,en comparació amb els films de midó, sense efectes rellevants sobre les altres propietats funcionals.Quan els laminats es van provar in vitro contra ceps Gram(+) i Gram(-) van mostrar un efecte antibacterià semblant al de les fibres de PCL amb carvacrol,però retardat en el temps.Els estudis de desintegració-biodegradació dels laminats midó-PCL van revelar que les pel·lícules amb carvacrol van afectar l'activitat de l'inocule del compost,disminuint lleugerament la biodegradabilitat,però aconseguint valors de desintegració semblants(75-80%)a les mostres lliures de carvacrol.Es van obtindre també laminats de PLA i PVA per mitjà de l'extensió i assecat de dissolucions aquoses de PVA amb carvacrol.La superfície del PLA va ser sotmesa a aminolizatció a fi de millorar l'extensibilitat de les dissolucions aquoses.A pesar de l'increment de la component polar de l'energia superficial del PLA i la seua millorada mullabilitat amb les solucions de PVA,estes bicapes no van mostrar una millora significativa en les propietats mecàniques i de barrera
[EN] The massive use of synthetic plastics and their environmental impact makes necessary the search for biodegradable alternatives for food packaging. Likewise, the need to increase the shelf life of food has aroused great interest in the development of active materials (antimicrobial and antioxidant) that maintain food quality and safety for longer periods of time through the use of compounds of natural origin, safe for the consumer. In this sense, the development of active biodegradable materials for food packaging is both a major imperative and challenge for the food industry today. In the present Doctoral Thesis, the encapsulation of carvacrol has been studied by means of the electrospinning or casting of different polymeric solutions with carvacrol. Biodegradable polymers with different polarities (thermoplastic starch: TPS, poly(vinyl-alcohol): PVA, poly-(¿-caprolactone): PCL or poly(lactic acid): PLA) dissolved in the appropriate solvent have been used to obtain active layers. These have been combined with other polymers with complementary properties, to obtain active laminates suitable for food packaging. The laminates combined polar polymers (TPS or PVA) and non-polar polyesters (PCL or PLA) incorporating carvacrol in one of the layers. The release kinetics of the active ingredient was evaluated, as well as the antimicrobial action of the materials obtained. The laminates were characterized in their functionality as a packaging material (barrier, mechanical or optical properties), as well as in their structure and thermal behaviour. Encapsulation studies revealed a higher encapsulating potential of carvacrol for non-polar polymers (PCL and PLA), although PVA also showed a good affinity with the active compound. The PVA matrix showed a higher retention of carvacrol by electrospinning of its aqueous solutions than by casting, without the need for addition of surfactants such as Tween 85. For the encapsulation in PLA, binary mixtures of solvents suitable for food contact (ethyl acetate and DMSO) were used. A higher encapsulation efficiency of PLA was obtained in the materials produced by casting than by electrospinning. The carvacrol release kinetics of PCL fibres explained the higher antibacterial effect against Escherichia coli and the lower antilisterial effect. The release ratio of the active ingredient increased when the polarity of the food simulants decreased, showing a complete release in non-polar systems and only up to 75% in aqueous systems that would require a higher proportion of the active ingredient in the packaging material to enhance its effectiveness. The combination of TPS films with carvacrol loaded PCL fibres resulted in materials with improved water vapour permeabilities, compared to starch films, with no relevant effects on the other functional properties. When the laminates were tested in vitro against Gram (+) and Gram (-) strains, they showed a similar antibacterial effect to that of PCL fibres with carvacrol, but delayed in time. Disintegration-biodegradation studies of PCL-starch laminates revealed that carvacrol films affected the activity of the compost inoculum, slightly decreasing the biodegradability of the laminates, but reaching similar disintegration values (75-80%) to the carvacrol-free samples. PLA and PVA laminates were also obtained by casting aqueous PVA solutions with carvacrol. The surface of PLA was submitted to aminolization in order to improve the extensibility of the aqueous solutions. Despite the increase in the polar component of the PLA surface energy and its improved wettability with PVA solutions, these bilayers did not show significant improvement in mechanical and barrier properties over the PLA monolayers.
The authors would like to thank the Ministerio de Economia y Competitividad of Spain, for funding this study as part of projects AGL2013-42989-R and AGL2016-76699-R and predoctoral research grant # BES-2014-068100.
Tampau, A. (2020). Carvacrol encapsulation by electrospinning or solvent casting to obtain biodegradable multilayer active films for food packaging applications [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/140313
TESIS
Venkatesha, K. S. "Finite Element Estimates Of Strain Energy Release Rate Components At Interface Cracks." Thesis, 1995. http://etd.iisc.ernet.in/handle/2005/1860.
Повний текст джерелаSu, Wei-Bo, and 蘇威博. "Strain Energy Release Rate in a multi-layer beam with intetrfacial crack." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/20190069109729446381.
Повний текст джерела元智大學
機械工程學系
91
Multi-layer structures are common in electronic package especially for the micro devices manufactured Via the semi-conductor processes or MEMS processes. Interfacial crack due to the delamination significantly weakens the multi-layer structure. It is desired to understand the interfacial fracture properties of the electronic packaging materials. In this research, four specimens named Doubled Cantilever Beam (DCB), End-Notched Flexure (ENF), Four-Point-Bending, and Three-Point-Bending are proposed to investigate the fracture toughness associated with modeⅠ,modeⅡ and mixed mode. Basing on the Bernoulli beam theory, the strain energy in a multi-layer beam is derived the strain energy before and after the propagation of the interfacial crack are calculated, lead to the determination of the strain energy release rate. The analytical results of strain energy release rate derived in this investigation are compared with the numerical results obtained from finite element method and literature’s report. The effects of material properties and thickness between the adjacent layers of interfacial crack are examined through the parametric study.
Zhuang, Linqi. "Effects of Voids on Delamination Growth in Composite Laminates under Compression." Thesis, 2012. http://hdl.handle.net/1969.1/148385.
Повний текст джерелаLin, Chin-Hsien, and 林志賢. "Thermal Stress Analysis and Strain Energy Release Rate in a Multi-layer Beam." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/05811773462538380020.
Повний текст джерела元智大學
機械工程學系
94
Multi-layer structures are common in electronic package especially for the micro devices manufactured Via the semi-conductor processes or MEMS processes. As the multi-layer structures subject to uniform temperature change, the thermal stresses are induced due to the mismatch of the coefficients of thermal expansion between the adjacent layers. In this investigation, the longitudinal thermal stresses in the middle region of a bi-layer beam and a tri-layer beam are derived basing on the Euler-Bernoulli beam theory. The strain energy release rate of a bi-layer beam and a tri-layer beam with interfacial crack are derived basing on the theory of fracture mechanics. The analytical expressions of the longitudinal thermal stress and strain energy release rate are validated by the finite element method. The effect of Young’s modulus, coefficients of thermal expansion and thickness between the adjacent layers on the thermal stress and strain energy release rate are presented through parametric study.
ming, li chi, and 李啟銘. "Cell-release and properties of polycaprolactone composites encapsulating phosphate-solubilizing bacterium Bacillus sp. Strain PG01." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/73562776434336907844.
Повний текст джерела高苑科技大學
高分子環保材料研究所
94
英文摘要 This study examined the feasibility of using polycaprolactone (PCL) and its composites (with Starch and/or HA) encapsulating cells of phosphate-solubilizing bacteria (PBS) for the development of biodegradable and “controlled-release” bacterial fertilizer. The PSB used in this work was able to degrade all the cell-release. Morphology observation indicates that severe disruption of the capsule structure occurred after incubation for 30-60 days. The biodegradability of the capsules decreased in the order of PCL/Starch (20Wt.%) > PCL alone > PCL/HA (20Wt.%). Similar trends were also observed for the decrease in enthalpy (△Hm), suggesting strong connections between biodegradability and the thermal properties. Addition of Starch appeared to enhance the biodegradability of the capsules,whereas the HA-blended composites were less biodegradable. The amount and rate of cell release from cell-encapsulated PCL-based capsules were positively dependent on the biodegradability and on the decrease in the thermal enthalpy of melting. The cell-release profiles were, however, quite similar for all types of capsules. The outcome of this work seems to suggest that by proper manipulation of composite composition, controlled release of the bacterial fertilizer (i.e.,Bacillus sp. PG01 cells) may be achievable.
Ting-HaoChang and 張庭豪. "Investigation of the Effect of Blue InGaN Light-Emitting Diodes with Different Insertion Strain-Release Layer." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/85020929467690154637.
Повний текст джерела國立成功大學
微電子工程研究所碩博士班
100
Quantum confine Stark effect (QCSE) would reduce the efficiency of LEDs. To reduce the residual strain in the MQWs of LEDs, we fabricate three different strain-released LEDs. We use the electroluminescence (EL) to measure the emission wavelength and determine the strain of LEDs. It is well known that the QCSE is relative to the blueshift of emission wavelength. The blueshift of screening effect for LED A (Strain-released layer, n-GaN/u-InGaN SPS), LED B (Strain-released layer, LT n-GaN) and LED C (Strain-released layer, p-GaN/p-InGaN SPS) are 0.39 nm, 0.32 nm and 0.54 nm, respectively. External quantum efficiency of LED B is the largest, 10.3 mw with injection current 20 mA. However, the wall plug efficiency (WPE) droop of LED B is the smallest, which is attributed to its high junction temperature. Thus, the factor dominates in junction temperature is series resistance. Furthermore, the high series resistance would be attributed to the strain-released structure of LEDs.
Juang, Kai-Tsahn, and 莊鎧燦. "The Evaluation of Mode III Strain Energy Release Rate and Shear Moduli Measurement in Thick Composite Laminates." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/89643193250743559391.
Повний текст джерелаChiang, Li-Wei, and 姜禮維. "Effect of the AuSn Eutectic Bonding Joint by Studying the Underneath Al/AlN Multiple Strain Release Layers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3u5xs3.
Повний текст джерела國立虎尾科技大學
光電與材料科技研究所
101
In this thesis, the Al/AlN multiple-layer films were used as the strain release layers between glass substrate and AuSn eutectic metal. Due to a great amount of heterostructural interface change, it is beneficial to increase the material toughness, stop the fissure expansion, and enhance the abrasion resistance. In addition, Al is a soft metal with extraordinary ductility, and AlN, as a ceramic material, shows extremely high heat transfer coefficient and hardness. The integration of these two materials can form a structure that is applicable to create the strain release layers so as to enhance the later deposited film reliability. This study utilized sputtering to deposit one set, two sets, and three sets of Al/AlN multiple-layer films onto the glass substrates, and finalize an Al cap layer. After the aluminum film surfaces were chemically processed. The electroplating technique was used to prepare the required AuSn eutectic bonding layers. The optimized shear stress and bonding temperature were discussed for various release layers. It was found that the optimal bonding temperature and shear stress increased with increasing the number of film layers. Subsequently, the SEM and XRD analysis were performed on various films to find more the optimal eutectic phase ζ (Au5Sn). In the final, the photolithography was used to define the pattern of flip-chip LED bounding carrier. The encapsulated LED sample was operated at 20 mA, and the forward voltage was measured as 4.09 V.
Lan, Mengyu. "Developments in Extended Finite Element Methods for Extraction of Strain Energy Release Rates and Computational Nanomechanics for SWCNT Aggregates." Thesis, 2013. https://doi.org/10.7916/D8V69RSP.
Повний текст джерелаAkdag, Selahattin. "Experimental investigation of damage evolution during strain burst in brittle rocks for deep mines." Thesis, 2019. http://hdl.handle.net/2440/120726.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2019
Li, Li-Guo, and 李立國. "Strain Release of InGaN/GaN Quantum Wells through Nano-hole Fabrication and Formation of Metal Particles for Surface Plasmon Study with the Anodic Aluminum Oxide Technique." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/64807688490105296426.
Повний текст джерела國立臺灣大學
光電工程學研究所
96
In this research, we fabricate anodic alumina oxide (AAO) on GaN and InGaN/GaN quantum well (QW) structure. With the AAO technique, we can fabricate a thin aluminum oxide film with nano-pore array on the nitride structure, which is used as a mask to deposit metal nano-particle arrays on to study the surface plasmon (SP) characteristics, or to release the strain in the QW. Our first study is about the SP characteristics of a silver or gold nano-particle array on GaN template. We change the AAO process condition to control the hole diameter and interpore distance such that we can vary the particle size and density of the metal nano-particle array. We observe the SP absorption spectra and its resonance frequencies of different particle sizes and densities. The second study is about the strain relaxation phenomenon by fabricating nano-hole array patterns with the AAO technique on an InGaN/GaN QW structure. The effective strain relaxation, leading to the significant enhancement of emission efficiency and reduction of quantum-confined Stark effect (QCSE), in a high-indium InGaN/GaN QW structure via nano-pore fabrication on the sample surface with the anodic aluminum oxide technique is demonstrated. By generating nano-pores of 60 nm in size, 4.71 x 109 cm-2 in pore density, and a depth several nm above the QW, the internal quantum efficiency (IQE) can be increased by about three times and the QCSE is reduced by 2.5 times while the emission spectrum is blue-shifted by 14 nm in the green range. With this approach, it is possible to achieve a higher IQE and a smaller QCSE by relaxing the built-in strain of a higher-indium QW structure and blue-shifting its emission, when compared with a lower-indium sample of the same emission spectrum as the blue-shifted one.
Li, Li-Guo. "Strain Release of InGaN/GaN Quantum Wells through Nano-hole Fabrication and Formation of Metal Particles for Surface Plasmon Study with the Anodic Aluminum Oxide Technique." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2607200817144200.
Повний текст джерелаElfahri, Khaled. "Anticarcinogenic Peptides Released from Milk Proteins by Lactobacillus Strains." Thesis, 2018. https://vuir.vu.edu.au/36844/.
Повний текст джерелаZhao, Ruogang. "The Development and Application of Tools to Study the Multiscale Biomechanics of the Aortic Valve." Thesis, 2012. http://hdl.handle.net/1807/33866.
Повний текст джерелаhsiung, Chih, and 李志雄. "Outside the liquefied natural gas storage tank releases the harmappraisal and its the urgent strain plan grinds draws up -- Take the Taichung port some newly built liquefied natural gasreceiving station as the example." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/76515585266754415631.
Повний текст джерела國立雲林科技大學
環境與安全工程系碩士班
95
The main ingredient of the liquefied natural gas is methane whose volume will become 600 times at 0℃ and 1 atm. Once little leaking out natural gas mix with air and have the chance to get heat, it will cause a terrible fire and explosion. Or a factory at a neighbor industrial estate has fire and the conductance of heat radiation make the temperature of the reserve tanks of the liquefied natural gas to the point, and there will be a explosion causing by mixing pressure releasing vapor and air. And the gas is lighter than air, so it could be on fire easily even far away from the fire source. Especially in such a high population density and highly developed of the oil and chemistry industry country like Taiwan, the releasing of poison matters might be a serious danger to a worker’s life and property, Therefore the purpose of the article is to quantify and estimate the risk of the releasing of the liquefied natural gas, and take some necessary emergency to control the damage of environment and personal health. The article will treat the safety of the LNG station in the process of manufacturing, reserving, and carrying, or the result of that there are some liquefied natural gas release or get fire. We use the software “ALOHA” to analyze the degree of damage, and USA risk management model “Rmp*Comp” to simulate the quantity of releasing and the degree of damage. According to the atmosphere condition and assumptive releasing condition, to analyse the worst-case scenario and alternative release scenarios. By considering with the different releasing distance between LNG reserve tanks and affiliated installations, we could have some reference of preliminary emergency to secure people. And we could spray, separate, or use water mitigation system to decease the damage caused by releasing. We could conclude that the degree of damage is influenced by releasing quantity, releasing condition, and the height of releasing source by simulating many scenarios. We suggest that the source management, maintain, and training plan should be noticed at the same time to reduce the danger. Or we should building emergency center to control the releasing condition and avoid influencing the neighbor a residential area or industrial estate.