Letteratura scientifica selezionata sul tema "A-540"
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Articoli di riviste sul tema "A-540"
Özbek, Osman, e Mustafa Ahmed Jalal Al-Sammarraie. "Determination of Operating Characteristics of 540 and 540E PTO Applications in Disc Type Silage Machines". Turkish Journal of Agriculture - Food Science and Technology 8, n. 8 (30 agosto 2020): 1692–96. http://dx.doi.org/10.24925/turjaf.v8i8.1692-1696.3462.
Testo completoFrestika, Mia Yuliana, Rina Dewi Mayasari, Masmui Masmui, Agustanhakri Agustanhakri, R. Ibrahim Purawiardi, Yuliasari Yuliasari, Ahmad Novi Muslimin, Muhammad Dani, Agus Setyo Budi e Ratno Nuryadi. "INVESTIGASI PEMBENTUKKAN IKATAN Zn-O RODS DI ATAS PERMUKAAN MIKROKANTILEVER DENGAN UJI KARAKTERISASI FTIR". SPEKTRA: Jurnal Fisika dan Aplikasinya 2, n. 2 (31 agosto 2017): 91. http://dx.doi.org/10.21009/spektra.022.01.
Testo completoZhan, Shuyu, Xiaohui Fan, Feng Zhang, Yi Wang, Liyuan Kang e Zheng Li. "Correction: A proteomic study of Shengmai injection's mechanism on preventing cardiac ischemia-reperfusion injury via energy metabolism modulation". Molecular BioSystems 12, n. 2 (2016): 674–77. http://dx.doi.org/10.1039/c5mb90052b.
Testo completoChen, Yi-Ning, Ching Ching Wu, Tom Bryan, Tom Hooper, Donna Schrader e Tsang Long Lin. "PATHOGENICITY, IMMUNOGENICITY, PROTECTION EFFICACY, AND SPIKE PROTEIN GENE SEQUENCE OF A HIGH-PASSAGE TURKEY CORONAVIRUS SERIALLY PASSAGED IN EMBRYONATED TURKEY EGGS". Taiwan Veterinary Journal 44, n. 04 (dicembre 2018): 165–78. http://dx.doi.org/10.1142/s1682648518500075.
Testo completoLin, Hsiao-Yin, Chin-Tin Chen e Ching-Tsan Huang. "Use of Merocyanine 540 for Photodynamic Inactivation of Staphylococcus aureus Planktonic and Biofilm Cells". Applied and Environmental Microbiology 70, n. 11 (novembre 2004): 6453–58. http://dx.doi.org/10.1128/aem.70.11.6453-6458.2004.
Testo completoWhitby, Michael. "A Defence of the Traditional Chronology of 542–545, Again". Classica Cracoviensia 26 (29 dicembre 2023): 219–38. http://dx.doi.org/10.12797/cc.26.2023.26.04.
Testo completoSEMENOVA, Irina, Zouqi WU, Ichiro HAGIWARA e Junichi SHINODA. "540 A NEW ERROR-MEASURE FOR COMPARISON SHAPES". Proceedings of the JSME annual meeting 2005.1 (2005): 49–50. http://dx.doi.org/10.1299/jsmemecjo.2005.1.0_49.
Testo completoLum, LG, M. Yamagami, BR Giddings, I. Joshi, SL Schober, LL Sensenbrenner e F. Sieber. "The immunoregulatory effects of merocyanine 540 on in vitro human T- and B-lymphocyte functions". Blood 77, n. 12 (15 giugno 1991): 2701–6. http://dx.doi.org/10.1182/blood.v77.12.2701.2701.
Testo completoLum, LG, M. Yamagami, BR Giddings, I. Joshi, SL Schober, LL Sensenbrenner e F. Sieber. "The immunoregulatory effects of merocyanine 540 on in vitro human T- and B-lymphocyte functions". Blood 77, n. 12 (15 giugno 1991): 2701–6. http://dx.doi.org/10.1182/blood.v77.12.2701.bloodjournal77122701.
Testo completoTong, Zhi Peng, Shou Zhi Pu, Shi Qiang Cui e Wei Jun Liu. "Synthesis and Optoelectronic Properties of a New Photochromic Diarylethene Bearing a Cyano Group". Advanced Materials Research 239-242 (maggio 2011): 2419–22. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.2419.
Testo completoTesi sul tema "A-540"
Haugsten, Hansen Thomas. "Offshore Wind Farm Layouts : Performance Comparison for a 540 MW Offshore Wind Farm". Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9990.
Testo completoThis master thesis has been written at the Department of Electric Power Engineering at the Norwegian University of Science and Technology. The work has been carried out at the Royal Institute of Technology in Stockholm, where the author spent the last year of his studies as an exchange student. In the thesis, six different designs of the electrical grid of a 540 MW offshore wind farm, placed 100km off the Norwegian coast, have been studied and compared. At this distance, AC cable transmission might be difficult because of the reactive power production in the cables. Taking this into consideration, two options for the transmission system to shore have been studied. In addition to the AC cable transmission, voltage source converter based HVDC transmission, in the form of HVDC Light, has been studied, giving a total of 12 models. The main scope of the thesis was to study the load flow situation and power system performance of the different offshore wind farm layouts. Two load flow cases were run for each model; the first studying the model when the active power transmission to shore was maximized, the second studying the model under a contingency situation. The reliability of the six designs was compared by calculating the expected number of cable failures during the life time of the wind farm for each design, and what consequence the disconnection of any cable would have on the power losses. In order to study the effect of the offshore grid design and transmission system design on the offshore power system stability, dynamic simulations have also been executed, and the voltage response and rotor speed response following a fault have been studied. All simulations have been executed in version 31 of the program PSS/E. The wind farm was modeled full scale, consisting of 108 wind turbines rated at 5MW. The wind turbines were modeled as doubly fed induction generators, using the generic wind model that comes with the program. The load flow simulations showed that an AC cable connection to shore gave lower total system losses than a DC connection for all designs. The lowest losses were found at the n-sided ring design in the AC/AC system, and the highest losses were found for the star design in the AC/DC system. These losses were 2.33% and 8.19% of the total installed capacity, respectively. In the dynamic simulations, a three phase short circuit fault, lasting 150ms, was applied at three different places in the system. The simulations showed that except from at the wind turbines that were islanded as a result of a fault, all dynamic responses were stable. The HVDC Light transmission to shore gave the highest voltage drops and the lowest voltage peaks offshore. Also, the maximum speed deviation was found to be larger when using HVDC Light transmission compared to using AC cables, with two exceptions; the radial and star designs when a fault was applied to the transmission system. A comparison of the six different grid designs showed that the results were varying. Based on the results in this thesis it has not been concluded that one of the offshore designs have better dynamic qualities than the other. The simulation results indicated that this is case specific, and more dependent on where in the offshore grid the fault occurs rather than the design of the offshore grid.
Siebert, Torsten Uwe. "Four-wave mixing techniques applied to the investigation of non-adiabatic dynamics in polyatomic molecules". Doctoral thesis, [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966017331.
Testo completoCanadell, Ayats Judit. "Synthesis of polymers with combined flame retardance and low shrinkage properties". Doctoral thesis, Universitat Rovira i Virgili, 2007. http://hdl.handle.net/10803/9016.
Testo completoEn aquests darrers anys s'han desenvolupat diferents estratègies per minimitzar la inflamabilitat dels materials polimèrics, com són la incorporació d'additius o la modificació de l'estructura química dels polímers comercials i la síntesis de polímers específics. La primera opció, àmpliament utilitzada en la indústria per raons econòmiques, presenta alguns inconvenients, ja que els additius es poden extreure amb aigua o dissolvents, poden migrar i poden disminuir les propietats físiques i químiques del material. La incorporació de l'element químic responsable de la resistència al foc, de forma que estigui químicament enllaçat al polímer, permet solucionar part dels problemes abans mencionats per als additius.
Tot i que en aquests últims anys hi ha hagut un increment en el nombre d'heteroelements utilitzats com a retardants a la flama, el mercat està encara dominat per compostos halogenats. Aquests compostos que són altament efectius, interferint amb les reaccions responsables de la propagació de la flama, presenten com a greu inconvenient que durant la seva combustió es desprenen gasos molt tòxics i corrosius. Per aquest motiu, s'estan fent molts esforços en el camp de la investigació en la cerca de nous retardants a la flama lliures d'halògens, que siguin més respectuosos amb el medi ambient i menys agressius en cas d'un incendi. Els compostos fosforats i sililats han demostrat ser efectius retardants a la flama més respectuosos ambientalment.
Un altre problema dels materials polimèrics és l'encongiment que pateixen durant la polimerització i el curat, que té conseqüències negatives en el producte final. Per exemple, en polímers que s'utilitzen com adhesius, es poden trobar zones amb menor capacitat d'adhesió al substrat. Quan s'utilitzen com a recubriments es poden produir tensions internes que poden generar esquerdes i cavitats en el material, reduint la seva durabilitat. En l'actualitat, aquesta problemàtica s'està minimitzant incorporant càrregues, però aquesta metòdica presenta alguns inconvenients ja que augmenta la viscositat del sistema, dificultant el processat i condueix a materials més rígids i fràgils. Una alternativa és utilitzar el que es coneix com a "monòmers expandibles", és a dir, aquells que durant el procés de curat no sofreixen contracció o que fins i tot s'expandeixen lleugerament. Entre els monòmers expandibles més utilitzats es troben els espiroortoesters.
Amb aquests antecedents, el que es va proposar en aquest treball és l'obtenció de nous materials ignifugants, lliures d'halògens, que presentin un baix encongiment durant la polimerització i el curat. Per assolir aquest objectiu, s'han desenvolupat diferents estratègies que a continuació s'exposen breument:
1. Síntesi de nous monòmers basats en espiroortoesters que continguin fòsfor o silici en la seva estructura. En concret, s'han sintetitzat dos espiroortoesters fosforats, el propanoat de (1,4,6-trioxaespiro [4.4] nonà-2-il)-metil-3-[10-(9,10-dihidro-9-oxa-9-fosfafenantrè-10-òxid-10-il)] i el maleat de bis[(1,4,6-trioxaespiro [4.4] nonà-2-il)-metil 2-[10-(9,10-dihidro-9-oxa-9-fosfafenantrè-10-òxid)] i un de sililat, el propanoat de 1,4,6-trioxaespiro [4.4]-2-nonilmetil 3-trimetil silil. Aquests nous monòmers s'han obtingut amb bons rendiments mitjançant la modificació d'espiroortoesters prèviament sintetitzats en el laboratori a partir d'una reacció d'esterificació o una addició de Michael. Els espiroortoesters precursors s'han obtingut per al mètode tradicional, a partir de la reacció de la -butirolactona i un epòxid.
S'ha estudiat la polimerització i copolimerització d'aquests espiroortoesters amb reïnes epoxi comercials amb triflat d'iterbi com a iniciador.
A més, també s'ha estudiat l'efecte de combinar fòsfor i silici en el mateix material, amb l'objectiu d'investigar un possible sinergisme entre els dos elements.
2. Síntesi de nous polímers linials que continguin fósfor i grups espiroortoester en la cadena lateral, a través de copolimeritzacions radicalàries entre un espiroortoester que conté un grup acrilat en la seva estructura i diferents monòmers fosforats. Aquests nous polímers s'han entrecreuat posteriorment amb triflat d'iterbi com a iniciador catiònic, a través de la doble obertura de l'espiroortoester.
També, s'ha investigat la copolimerització catiònica entre el polímer lineal que conté un espiroortoester en la cadena lateral i diferents mescles de reïnes epoxi. Mitjançant l'ús de reïnes epoxi fosforades, prèviament sintetitzades al laboratori, s'ha introduït fòsfor en el material final, aconseguint així millorar les propietats de retardància a la flama.
3. Finalment, s'ha estudiat un nou mètode de copolimerització d'espiroortoesters amb reïnes epoxi utilitzant radiacions de microones, per tal de reduir el temps de curat, i s'han comparat els resultats amb el mètode d'escalfament convencional.
Over the last few decades, the polymeric materials has been replaced the conventional materials due to the versatility, low density, and their interesting properties. However, they present as an important limitation, their high flammability and in presence of heat and oxygen, they burn easily and rapidly. The problem is not only the destruction of the material but the smoke and toxic gases which are the main causes of hazards in a fire.
In the last years different strategies have been developed to minimize the flammability of polymeric materials, such as the use of additives, the modification of commercial polymers or through the synthesis of specific polymers. The first strategy is the most widely use in the industry because is the most economic way to achieve flame retardancy. Nevertheless, this method has several disadvantages, because the additives have to be used in relatively high concentrations and this may affect the physical and mechanical properties of the material. Also, additives may be leached, or may volatilize from the polymer during service. The alternative strategy is to use reactive flame retardants, where the flame retardant is covalently bonded to the polymer chains.
Although in the last few years there has been an increase of heteroelements used as flame retardants, the commercial market is still dominated by compounds based on halogens. These compounds present exceptional efficiency, interfering with the reactions responsible of flame propagation. However, during the combustion they release toxic and corrosive gases. Because of that, in the last few years has increased the interest in the research of halogen-free based flame retardants, such as phosphorus or silicon based flame retardants, which are more environmentally friendly and less aggressive in a fire.
Another problem of polymeric materials is the shrinkage during polymerization and polymer curing, and the consequences can be presented in many different forms. For example, in polymeric coatings poor adhesion of the substrate can be observed. In cast electrical insulators, polymerization shrinkage can produce internal stress in the polymer, which can reduce the durability of the material as a consequence of the appearance of microvoids and microcracks. The most common way to solve this problem is through the use of fillers, however this method present several problems, such as an increase of the viscosity which make difficult to fill molds. Another more advisable strategy is through the use of "expanding monomers", thus means, that during the polymerization and curing they don't shrink or even can produce some expansion. The spiroorthoesters are one kind of expanding monomers.
The main purpose of this thesis is the obtention of new environmentally flame retardant materials that present low shrinkage during polymerization and polymer curing. Several approaches have been developed to achieve these desired properties:
1. Synthesis of new monomers based on spiroorthoesters that contains phosphorus or silicon in their structure. It has been synthesized two spiroorthoesters with phosphorus, (1,4,6-trioxaspiro-[4.4] nonan-2-yl)-methyl 3-[10-(9,10-dihydro-9-oxa-9-phosphaphenanthrene-10-oxide-10-yl)] propanoate and bis[(1,4,6-trioxaspiro-[4.4] nonan-2-yl)-methyl 2-[10-(9,10-dihydro-9-oxa-9-phosphaphenanthrene-10-oxide-10-yl)] maleate and one with silicon in its structure, the 1,4,6-trioxaspiro [4.4]-2-nonylmethyl 3-trimethylsilyl propanoate. These new spiroorthoesters were synthesized with good yields through the modification of previously synthesized spiroorthoesters by a Michael addition or esterification reaction. The spiroorthoester moiety was obtained from -butirolactone and an epoxide.
These spiroorthoesters were polymerized and copolymerized with epoxy resins with ytterbium triflate as a cationic initiator.
Also, with the aim to investigate the possible synergistic effect between phosphorus and silicon were both combined into the same material.
2. Synthesis of linear polymers which contains phosphorus and spiroorthoester moieties in the side chain. They were obtained by radical polymerization from an acrylate-containing spiroorthoesters and different radically polymerizable phosphorus-containing comonomers. The polymers were crosslinked by a cationic double ring-opening of the spiroorthoester moieties with ytterbium triflate as an initiator.
Also, it was studied the cationic copolymerization of a linear polymer which contains a spiroorthoester moiety in the side chain with different epoxy resins. Through the use of phosphorus-containing glycidyl derivatives it was introduced phosphorus into the material.
3. It was studied a new method of copolymerization of spiroorthoesters with epoxy resins using microwave irradiation with the purpose to minimize the curing time. The results were compared with conventional heating conditions.
Reinsch, Martin. "Entwicklung von Analyseverfahren zur Bestimmung von Ochratoxin A in Lebensmitteln". Doctoral thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980847982.
Testo completoBurýšek, Jan. "Navrhněte řešení spalování s vysokou účinností a nízkou emisí NOx pro granulační parní kotel,130 t/h,s parametry páry 13,6 MPa,540°C". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231269.
Testo completoFache, Maxence. "Fonctionnalisation et polymérisation de dérivés phénoliques naturels : Vers des matériaux aromatiques biosourcés Vanillin, a key-intermediate of biobased polymers Vanillin, a promising biobased building-block for monomer synthesis Biobased epoxy thermosets from vanillin-derived oligomers Amine hardeners and epoxy cross-linker from aromatic renewable resources Epoxy thermosets from model mixtures of the lignin-tovanillin process". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2015. http://www.theses.fr/2015ENCM0014.
Testo completoThe background of this work is the synthesis of bio-based polymers, a very active area of research. Epoxy thermosets were chosen as target because of the double problematic of bisphenol A substitution and of renewable resources use. Thus, the aim of this work is to prepare bio-based epoxy thermosets and to evaluate their potential as substitutes of current formulations. In order to display good thermo-mechanical properties, these polymers have to be prepared from renewable aromatics. Indeed, aromatic cycles bring rigidity and thermal stability to the network. Vanillin is one of the only aromatic molecules available from biomass at an industrial scale. It is obtained from the alkaline oxidative depolymerization of lignin. Recently, the preparation of renewable polymers from vanillin has been intensively explored; a review on this subject was compiled. Vanillin served as a building-block to prepare a platform of derivatives bearing various functions. Di-amine, di-epoxy, or di-(cyclic carbonate) monomers – among others – were synthesized. The di-epoxy monomers prepared were cross-linked with a common amine hardener and the polymers obtained were characterized. Their thermo-mechanical properties were linked to the monomers structure. These potentially bio-based epoxy thermosets have properties comparable to the bisphenol A-based reference. In order to tune these properties, vanillin-based epoxy oligomers were synthesized by the same method as the one used industrially. The properties of these oligomers and of the thermosets prepared from them could indeed be modulated. Other means of controlling the properties were tested, like the preparation and polymerization of new bio-based amine hardeners, or of a vanillin-based, tri-functional epoxy monomer. The thermoset prepared from this last compound displayed better properties than the bisphenol A-based reference. Finally, a work more centered on the resource was performed. Mixtures of phenolic compounds modelling the products of the lignin-to-vanillin process were prepared. The use of such mixtures instead of pure vanillin could be advantageous both from an economic and an ecologic point of view. These mixtures were glycidylated, polymerized, and the materials obtained were characterized. The excellent properties displayed by these materials allow a potential integration of this strategy in a bio-refinery
Tasso, Mariana Patricia. "Bioactive coatings to control marine biofouling". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-25187.
Testo completoRulliere, Pauline. "Vers la synthèse totale de la (-)-salinosporamide A et de la (+)-lactacystine par cycloaddition [2+2] asymétrique". Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENV023/document.
Testo completoThis thesis work focuses on the [2+2] asymmetric cycloaddition of ketenes and its application in total synthesis. The best reactivity of Z olefins compared to E olefins, one of the features of the [2+2] cycloaddition, is studied both from a synthetic and theoretically point of view, via DFT calculations. A methodology of [2+2] asymmetric cycloaddition between chiral enol ethers and various in situ generated ketenes was then developed. Cycloadditions limited to the use of dichloroketene hitherto was extended to a wide range of ketenes, leading to various highly functionalized cyclobutanones. Those chiral cyclobutanones were engaged in the total synthesis of natural products: lactacystin and salinosporamide A, proteasome inhibitors and potent anticancer agent. These syntheses have three common key steps : a [2+2] asymmetric cycloaddition, a Beckmann type ring expansion and a side chains functionalization. The formal synthesis of lactacystin is presented in this manuscript, as well as the work in progress towards the synthesis of salinosporamide A
Mercado, Roca Luis Adolfo. "Resinas epoxi sililadas retardantes a la llama. Síntesis, caracterización y propiedades". Doctoral thesis, Universitat Rovira i Virgili, 2005. http://hdl.handle.net/10803/9002.
Testo completoEn los últimos años se han descrito algunas aproximaciones sobre resinas epoxi con silicio unido covalentemente a la matriz polimérica. Así, han sido descritas modificaciones sobre resinas epoxi comerciales y copolimerizaciones de monómeros glicidílicos que contienen silicio con resinas epoxi comerciales, consiguiéndose una mejora de las propiedades retardantes a la llama sin sacrificar las propiedades mecánicas de la resina curada.
En este trabajo se ha planteado como objetivo general el desarrollo de resinas epoxi basadas en silicio con propiedades retardantes a la llama. Así, se ha llevado a cabo la síntesis de monómeros glicidílicos que contienen silicio en su estructura. Para establecer una relación entre la presencia y proporción del silicio y las propiedades físicas de los materiales resultantes, se han preparado polímeros termoestables a partir de mezclas de un glicidilo comercial con los monómeros que contienen silicio así como prepolímeros obtenidos a través de reacciones de crecimiento de cadena entre el DGEBA y un silanodiol. También se han sintetizado monómeros y agentes de curado que contienen fósforo en su estructura y se han preparado polímeros termoestables que contengan ambos heteroátomos. Con objeto de estudiar el mecanismo de reacción de monómeros que contienen silicio con aminas primarias, se ha sintetizado un monómero sililado monofuncional, fenilglicidiloxidimetilsilano (GDMPS), y se ha comparado su reactividad frente a una amina primaria, anilina, con la de un glicidilo comercial, fenilglicidiléter (PGE). El estudio cinético fue llevado a cabo mediante NIR y aplicando a los datos espectrales obtenidos métodos de análisis multivariante de resolución de curvas (MCR-ALS). Se ha llevado a cabo el estudio cinético del curado de un diglicidilo que contiene silicio, fenildiglicidiloximetilsilano (DGPMS), y de las mezclas de éste con DGEBA con una diamina primaria, DDM, mediante DSC isotérmico y dinámico. Además, se han estudiado los fenómenos de gelificacion y vitrificación de estos sistemas mediante DMTA en modo cizalla y TMDSC. Se han preparado polímeros termoestables y se han evaluado sus propiedades termodinamomecánicas, térmicas y de retardancia a la llama. Las propiedades termodinamomecánicas han sido estudiadas mediante DMTA en modo de flexión. La estabilidad térmica de estos compuestos se ha estudiado mediante análisis termogravimétrico en atmósfera de nitrógeno y de aire. Las propiedades de retardancia a la llama fueron evaluadas mediante el test ASTM-D-2683 del índice de oxígeno limitante (LOI). Finalmente, se ha estudiado la degradación térmica de los polímeros obtenidos para establecer el modo de actuación del silicio durante la degradación. Para ello, se ha realizado el estudio cinético de la degradación a partir datos obtenidos por TGA, estudios de las etapas iniciales de la degradación mediante quimioluminiscencia (QL) y la caracterización de los productos formados por TGA-MS, GC-MS, ATR-FTIR y DRX.
De los resultados obtenidos se han podido establecer las siguientes conclusiones: (1) Se ha determinado que la presencia del silicio produce un aumento en la reactividad del epóxido probablemente debido a efectos electrónicos. Esta mayor reactividad además reduce la importancia del camino autocatalítico en el curado con aminas primarias. (2) Las resinas epoxi sililadas termoestables muestran una disminución de la Tg y de la densidad de entrecruzamiento con el incremento del porcentaje de silicio.
Esta disminución está relacionada con un aumento del volumen libre debido a la mayor longitud de los enlaces Si-O. (3) Los polímeros termoestables que contienen silicio muestran un incremento del LOI a partir de un contenido de silicio del 3%. En los polímeros que contienen silicio y fósforo, se encontraron evidencias de la existencia de sinergia entre los dos heteroátomos. (4) La degradación de los polímeros que contienen silicio, tanto en atmósfera inerte como oxidante, conlleva la formación de oligómeros cíclicos de fenilmetilsiloxano, lo que implica que parte del silicio abandona la fase condensada. El residuo contiene silicio como SiO2, formando probablemente una capa aislante que actúa como barrera térmica y de transferencia de masa disminuyendo de esta manera la producción de volátiles.
The epoxy resins are widely used in coatings, adhesives, composites, etc. In some applications of epoxy resins special and versatile features are required, such as high adhesion to the substrates, low shrinkage, low thermal stress after curing, toughness, chemical resistance and low flammability. The flammability of epoxy resins is the main drawback in their application. Some flame retardants compounds, such as brominebased compounds, antimony oxides, phosphorous-halogen compounds etc. are incorporated in the epoxy resins to reduce their flammability. These compounds are exceptionally efficient but they have the inconvenience that they increase the smoke and toxic and corrosive gas evolution during the combustion of the polymer. For these drawbacks in the last years it has been increased the investigation of other heteroatoms like flame retardants to replace the halogens.
Some approaches about epoxy resins with silicon covalently bonded to the polymeric matrix have been reported. In this way, modifications of commercial epoxy resins and copolymerizations of silicon-based monomers with commercial epoxy resins giving to good flame retardancy, thermal and mechanical properties have been reported.
The aim of this thesis is the development of novel fire retardant silicon-based epoxy resins. Glycidyl monomers with silicon in their structure, prepolymers obtained by mean of growth of chain reactions between diphenyl silanediol and diglycidylether of bisphenol A (DGEBA) and a phosphorous-containing glycidyl monomer and two phosphorilated diamines were synthesized. Thermoset polymers were obtained from curing reactions of the compounds synthesized. To study the reaction kinetics of silicon-containing epoxy monomer with primary amines, a monofunctional silicon-containing epoxy monomer has been sinthesized, glycidyloxydimethylphenyl silane (GDMPS), and its reactivity with a primary amine, aniline, has been compared with that of a commercial epoxy monomer, phenylglycidylether (PGE). Kinetics studies were carried out by Near Infrared Spectroscopy (NIR) and applying to the spectral data obtained the multivariate resolution of curves methods. Likewise, the kinetic and curing behaviour studies for the difunctional silicon-containing epoxy monomer, diglycidyloxyphenylmethyl silane (DGPMS), and the mixtures of this monomer with DGEBA with a primary diamine, 4,4'- diaminediphenylmethane (DDM), have been carried out by means of isothermal and dynamic DSC. The gelation and vitrification for these systems have been studied by thermodinamechanical analysis (DMTA) with a shear sandwich clamp and modulated temperature differential scanning calorimetry (TMDSC).
The relationship between the amount of silicon and the thermodinamomechanical, thermal and flame retardancy properties of the thermoset materials obtained have been established. Thermoset materials were obtained from mixtures of commercial glycidyl monomer, DGEBA, with a silicon-containing glycidyl monomer, diglycidyloxyphenylmethyl silane (DGPMS), and their properties have been evaluated.
Thermodinamomechanical properties have been evaluated by DMTA using a 3-point bending clamp. The thermal stability have been analyzed by thermogravimetric analysis (TGA) in nitrogen and air atmospheres. The flame retardant properties have been evaluated by means of ASTM-D-2683, the limiting oxygen index test (LOI).
Finally, the thermal degradation of the silicon-containing polymers has been investigated by means of chemiluminiscence (CL), TGA-MS, GC-MS, ATR-FTIR and
DRX.
From the results obtained the following conclusions can be infered: (1) The silicon occurrence increases the reactivity of the epoxide due to electronic effects. This higher reactivity also reduces the importance of the autocatalytic path in the curing reactions with primary amines. (2) The thermoset epoxy resins showed a decrease in the Tg and the crosslinking density when the amount of silicon increases. This decrease is related with an increase of the free volume due to the Si-O and Si-C bonds. (3) The siliconcontaining thermosets show an increment of the LOI for silicon contents higher than 3%. In the polymers that contain silicon and phosphorous, there are evidences of the synergyc effect. (4) During the degradation of the silicon-containing materials in both, nitrogen and air atmospheres, cyclic siloxane oligomers were released. A silicon oxide rich char is formed, probably forming an insulating layer.
Agarwal, Sameer. "Transition Metal-Mediated Syntheses of Yohimbane and Indolizidine Alkaloids". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2005. http://nbn-resolving.de/urn:nbn:de:swb:14-1119360417222-39155.
Testo completoLibri sul tema "A-540"
Senesac, Yoko. Eigo de tanoshiku zatsudan dekiru hon: Let's have a chat! 540 phrases. Tōkyō: Asa Shuppan, 2008.
Cerca il testo completoGethyn, Timothy J., e United States. National Aeronautics and Space Administration., a cura di. The development and test of a deformable diffraction grating for a stigmatic EUV spectroheliometer: Final report for NASA grant NAGW-540 (formerly NASA grant NAGW-396). [Washington, DC: National Aeronautics and Space Administration, 1992.
Cerca il testo completoBradfield, Maitland. A Syrian archive: Being a study of the early churches and convents on the limestone massif, north Syria, AD. 324-451, and of their consequences in the far West (to c. 540). Derby: R. M. Bradfield, 2010.
Cerca il testo completo1952-, Griffiths Siân, e Hunter David J, a cura di. New perspectives in public health. 2a ed. Oxford: Radcliffe, 2007.
Cerca il testo completoBürckert, H. J., a cura di. A Resolution Principle for a Logic with Restricted Quantifiers. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/3-540-55034-8.
Testo completoHunt, Warren A., a cura di. FM8501: A Verified Microprocessor. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/3-540-57960-5.
Testo completoHoubak, Niels. SIL—a Simulation Language. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/3-540-52497-5.
Testo completoKlapp, Jaime, Jorge L. Cervantes-Cota e José Federico Chávez Alcalá, a cura di. Towards a Cleaner Planet. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71345-6.
Testo completoFulcher, John, e L. C. Jain, a cura di. Computational Intelligence: A Compendium. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-78293-3.
Testo completoM, Chain B., a cura di. Immunology at a glance. 7a ed. Oxford: Blackwell Science, 2001.
Cerca il testo completoCapitoli di libri sul tema "A-540"
Párkányi, Cyril, Alain Adenier e Jean-Jacques Aaron. "Merocyanine 540—A Fluorescent Dye and a Biological Probe". In Analytical Use of Fluorescent Probes in Oncology, 371–82. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4615-5845-3_40.
Testo completoLi, Tong. "China’s Nonperforming Loans: A $540 Billion Problem Unsolved". In China's Emerging Financial Markets, 403–22. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-93769-4_12.
Testo completoCannizzaro, Francesco. "Gli errores (meta)letterari del Meandro da Augusto ai Flavi". In Studi e ricerche del Dipartimento di Lettere e Filosofia, 155–75. Firenze: Società Editrice Fiorentina, 2024. http://dx.doi.org/10.35948/dilef/978-88-6032-734-5.11.
Testo completoLoosch, Reinhard. "From “Programme 93 + 2” to Model Protocol INFCIRC/540: Negotiating for a Multilateral Agreement in the International Atomic Energy Agency". In Tightening the Reins, 23–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57147-3_3.
Testo completoEisenberg, Merle, e Lee Mordechai. "The Short- and Long-Term Effects of an Early Medieval Pandemic". In Perspectives on Public Policy in Societal-Environmental Crises, 291–303. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94137-6_19.
Testo completoKossovsky, Nir. "A $54 Billion Reputation". In Reputation, Stock Price, and You, 11–28. Berkeley, CA: Apress, 2012. http://dx.doi.org/10.1007/978-1-4302-4891-0_2.
Testo completoBährle-Rapp, Marina. "a..., A..." In Springer Lexikon Kosmetik und Körperpflege, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_3.
Testo completoCarrascosa, Antonio, Angel Ferrández, Laura Audí e Elena Sánchez. "Pubertal Growth and Adult Height According to Age at Pubertal Growth Spurt Onset: Data from a Spanish Study Including 540 Subjects (281 Boys and 259 Girls)". In Handbook of Growth and Growth Monitoring in Health and Disease, 1525–44. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-1795-9_90.
Testo completoBrock-Utne, John G. "Case 54: A Patient in a Halo". In Clinical Anesthesia, 189–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-71467-7_54.
Testo completoBrock-Utne, John G. "Case 54: Neurofibromatosis. A Warning". In Near Misses in Pediatric Anesthesia, 163–64. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7040-3_54.
Testo completoAtti di convegni sul tema "A-540"
Hadland, Roger, David Bowley e Jo Honour. "X-Chron 540 - A New Picosecond X-Ray Streak Camera". In 16th International Congress on High Speed Photography and Photonics, a cura di Michel L. Andre e Manfred Hugenschmidt. SPIE, 1985. http://dx.doi.org/10.1117/12.968066.
Testo completoChakraborty, Prabir, Myriam N. Bouchlaka, Benjamin J. Capoccia, Ronald R. Hiebsch, Michael J. Donio, Robyn J. Puro, Vicki Sung e Daniel S. Pereira. "Abstract 540: AO-176, a normal cell sparing humanized anti-CD47 antibody". In Proceedings: AACR Annual Meeting 2019; March 29-April 3, 2019; Atlanta, GA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.sabcs18-540.
Testo completoChakraborty, Prabir, Myriam N. Bouchlaka, Benjamin J. Capoccia, Ronald R. Hiebsch, Michael J. Donio, Robyn J. Puro, Vicki Sung e Daniel S. Pereira. "Abstract 540: AO-176, a normal cell sparing humanized anti-CD47 antibody". In Proceedings: AACR Annual Meeting 2019; March 29-April 3, 2019; Atlanta, GA. American Association for Cancer Research, 2019. http://dx.doi.org/10.1158/1538-7445.am2019-540.
Testo completoWesner, Michael F., e Steven K. Shevell. "Changes in color appearance caused by dark contours in a chromatic adapting background". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.fa6.
Testo completoIsmagilov, Flyur, Viacheslav Vavilov, Denis Gusakov, Kirill Barabanov e Iskander Garipov. "Development of an AC / DC Converter for Powering a Load of 540 V DC". In 2021 Dynamics of Systems, Mechanisms and Machines (Dynamics). IEEE, 2021. http://dx.doi.org/10.1109/dynamics52735.2021.9653717.
Testo completoWatts, Gemma, Aneurin Young, Mark John Johnson e Olie Chowdhury. "540 The incidence of metabolic bone disease of prematurity (MBDP) in a high-risk population". In Royal College of Paediatrics and Child Health, Abstracts of the RCPCH Conference–Online, 15 June 2021–17 June 2021. BMJ Publishing Group Ltd and Royal College of Paediatrics and Child Health, 2021. http://dx.doi.org/10.1136/archdischild-2021-rcpch.58.
Testo completoRattigan, Yanique I., Alister F. Martin, John Glod e Debabrata Banerjee. "Abstract 540: Lactate as a mediator of mesenchymal stem cell interactions within the tumor microenvironment". In Proceedings: AACR 101st Annual Meeting 2010‐‐ Apr 17‐21, 2010; Washington, DC. American Association for Cancer Research, 2010. http://dx.doi.org/10.1158/1538-7445.am10-540.
Testo completoXu, Yinuo, Yingwei He, Houping Wu, Weimin Wang, Xiangliang Liu, Yangting Fu, Xufeng Jing e Haiyong Gan. "Spectral transmittance measurement nonlinearity of a (280-540) nm spectrophotometer based on a tunable femtosecond pulse laser". In International Conference on Optical Instruments and Technology 2019: Advanced Laser Technology and Applications, a cura di Pu Wang, Franz X. Kärtner, Zhiyi Wei, Chunqing Gao e Stefan A. Weber. SPIE, 2020. http://dx.doi.org/10.1117/12.2550286.
Testo completoWu, Ming-Hsiung, Yan-Jou Lin, Fredrik Laurell e Yen-Chieh Huang. "Monolithic KTP Raman Oscillator as a Supercontinuum Source". In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jtu3b.7.
Testo completoDanova, Tsvetomira. "Беседа ІІІ от Учителното евангелие на Константин Преславски в състава на среднобългарски Триоден панигирик от XIV в. / Sermon III in Constantine of Preslav’s Učitelno evangelie (Didactic Gospel) Contained in a Middle Bulgarian Triodion Panegyrikon from the XIV Century". In Учителното евангелие на Константин Преславски и южнославянските преводи на хомилетични текстове (IX-XIII в.): филологически и интердисциплинарни ракурси / Constantine of Preslav’s Uchitel’noe Evangelie and the South Slavonic Homiletic Texts (9th-13th century): Philological and Interdisciplinary Aspects. Institute of Balkan Studies and Centre of Thracology – Bulgarian Academy of Sciences, 2024. http://dx.doi.org/10.62761/491.sb37.12.
Testo completoRapporti di organizzazioni sul tema "A-540"
Ramsey, Andree L., Heather H. Furey e Amy S. Bower. Overturning of the Subpolar North Atlantic Program (OSNAP): RAFOS Float Data Report June 2014 - January 2019. Woods Hole Oceanographic Institution, dicembre 2022. http://dx.doi.org/10.1575/1912/29540.
Testo completoMuldavin, Esteban, Yvonne Chauvin, Teri Neville, Hannah Varani, Jacqueline Smith, Paul Neville e Tani Hubbard. A vegetation classi?cation and map: Guadalupe Mountains National Park. National Park Service, 2024. http://dx.doi.org/10.36967/2302855.
Testo completoPurkayastha, Sanjay. Laparoscopic Cholecystectomy in a 54 year-old male patient. Touch Surgery Simulations, maggio 2018. http://dx.doi.org/10.18556/touchsurgery/2018.s0081.
Testo completoRigby, Dan, Michael Burton, Katherine Payne, Zachary Payne-Thompson, Stuart Wright e Sarah O’Brien. Impacts of Food Hypersensitivities on Quality of Life in the UK and Willingness to Pay (WTP) to remove those impacts. Food Standards Agency, dicembre 2022. http://dx.doi.org/10.46756/sci.fsa.kij502.
Testo completoWeiss, Thomas J. National Guard Pre-Mobilization Training Certification: 54 Ways to Skin a Cat. Fort Belvoir, VA: Defense Technical Information Center, marzo 2008. http://dx.doi.org/10.21236/ada478949.
Testo completoCowell. PR-283-07201-R01 Solar Mars ABC Liner on the Mars 100 SoLoNOx Gas Turbine. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), giugno 2005. http://dx.doi.org/10.55274/r0010768.
Testo completoPapí-Gálvez, Natalia, e Daniel La Parra-Casado. Informe 2022. Càtedra de Bretxa Digital Generacional. Les persones majors en l’era de la digitalització a la Comunitat Valenciana (Dades 2021). Càtedra de Bretxa Digital Generacional, 2022. http://dx.doi.org/10.14198/bua.2022.papi.infv.
Testo completoPapí-Gálvez, Natalia, e Daniel La Parra-Casado. Informe 2022. Cátedra de Brecha Digital Generacional. Las personas mayores en la era de la digitalización en la Comunidad Valenciana (datos 2021). Cátedra de Brecha Digital Generacional, 2022. http://dx.doi.org/10.14198/bua.2022.papi.infc.
Testo completoSGC, Servicio Geológico Colombiano. Mapa Geomorfológico aplicado a movimientos en masa escala 1:100.000. Plancha 54 Mompós. Producto. Bogotá: Servicio Geológico Colombiano, giugno 2016. http://dx.doi.org/10.32685/4.7.2016.588.
Testo completoMiddlebrooks, Bobby L. Evaluation of a DNA Vaccine Specific for the 54 kDa Protective Antigen of Erysipelothrix rhusiopathiae. Fort Belvoir, VA: Defense Technical Information Center, dicembre 2006. http://dx.doi.org/10.21236/ada495910.
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