Dissertations / Theses on the topic 'Cobalt acetate'
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Lau, S. "Cobalt(III) acetate - its structures and catalytic activity." Thesis, University of Hull, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233969.
Full textClatworthy, Edwin Byrne. "Investigations of Cobalt Acetate and Titanium Nitride for Catalytic and Sustainable Chemistry." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/19641.
Full textDitalelo, Gofetamang. "The role of cobalt and nickel in biogas production from anaerobic digestion of acetate." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7156/.
Full textAnwar, Amin Ahmed. "Catalytic Oxidation of 4-t-butyltoluene." University of Sydney. Chemistry, 2003. http://hdl.handle.net/2123/506.
Full textAnwar, Amin Ahmed. "Catalytic Oxidation of 4-t-butyltoluene." Thesis, The University of Sydney, 2002. http://hdl.handle.net/2123/506.
Full textRocha, Beatriz Aline Riga [UNESP]. "Síntese de ligantes diimínicos para obtenção de complexos organocobalto(III) para polimerização radicalar mediada por cobalto." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/149815.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho objetivou-se a síntese e caracterização de oito complexos de cobalto(II) que fossem aptos a atuarem como agentes controladores na Polimerização Radicalar Mediada por Cobalto do monômero acetato de vinila. Através da modulação da esfera de coordenação destes complexos com a alteração dos efeitos estéricos e eletrônicos promovidos pela coordenação de ligantes α-diiminas, buscou-se estabelecer parâmetros para propor a forma como estes complexos mediam a CMRP do referido monômero. Os complexos foram divididos em dois grupos, objetivando uma avaliação mais eficiente da forma como os efeitos estéricos e eletrônicos interferem na capacidade controladora dos mesmos. Após a variação sistemática das proporções molares entre complexo, iniciador e monômero encontrou-se na proporção [Co]/[AIBN]/[VAc] = 1/3,25/542 os resultados mais satisfatórios deste trabalho. O uso de DMSO fora prejudicial para os complexos 2a-c, porém fez com que os complexos 2d-h apresentassem melhorias, reduzindo seus valores de polidispersidade e aumentando as massas moleculares dos polímeros. O complexo 2b fora escolhido como o melhor controlador do grupo do efeito estérico, por reunir em si as características estérias e eletrônicas que o fizeram apresentar os menores valores de polidispersidade (Đmáx = 1,43). Com relação ao grupo de complexos do efeito eletrônico, fora o complexo 2f que, devido à maior estabilidade estrutural conferida ao complexo por seu substituinte cicloexil, apresentara as menores polidispersidades de seu grupo, entre 1,12 e 1,58.
This work aimed the synthesis and characterization of eight cobalt(II) complexes which could be able to act as controlling agents in vinyl acetate radical polymerization mediated by cobalt. By modulating the coordination sphere of these complexes, modifying the steric and electronic effects offered by the α-diimine ligands, we sought to establish parameters to propose how these complexes mediate the CMRP of vinyl acetate. The complexes were split in two groups in way to assess efficiently how the electronic and steric effects can affect the controlling capacity of the CoII(α-diimine).A systematic variation of the molar ratio such as [Co]/[initiator] and [Co]/[monomer] made it possible to choose [Co]/[initiator]/[monomer] = 1/3.25/542 as the ratio that provided certain level of control. The addition of DMSO was detrimental to the complexes 2a-c, but caused an improvement to the activity of complexes 2dh, reducing their polydispersity values and increasing the molecular weights of the polymers. Complex 2b was chosen as the best controller of the steric effect group, its steric and electronic characteristics made possible to reach the lowest polydispersity of its group (Đmax = 1.43).Regarding to the group of complexes of the electronic effect, it was the complex 2f that had the smallest polydispersity of its group, between 1.12 and 1.58, due to the greater structural stability conferred to the complex by its cyclohexyl substituent.
Sás, Juliana Frizarin Campos [UNESP]. "Síntese e aplicação de complexos de cobalto(II) coordenados a ligantes tetraimínicos na polimerização radicalar de acetato de vinila mediada por organometálicos." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/150487.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O trabalho reporta a síntese de dois novos complexos de cobalto(II), coordenados a ligantes tetraimínicos, estes foram denominados [Co(beb)](PF6)2 e [Co(bfb)](PF6)2. Os complexos foram caracterizados por Espectroscopia de Infravermelho (FT-IR), Espectroscopia de Ultravioleta-visível (UV-Vis) e Voltametria Cíclica (VC). A polimerização radicalar de acetato de vinila (VAc) foi iniciada pelo azobisisobutironitrila (AIBN) e realizada na presença de [Co(beb)](PF6)2 ou [Co(bfb)](PF6)2 como agentes controladores, a temperatura de 65 ºC. As massas moleculares de poliacetato de vinila (PVAc) foram analisadas por GPC e Cg.
This study describes the synthesis of two novel cobalt(II) complexes, coordinated to tetraimine ligands [Co(beb)](PF6)2 and [Co(bfb)](PF6)2, where beb = 1,2-diphenylethane-bis(N2 -benzylidene-N1 -methyleneethane- 1,2-diamine) and bfb = 1,2-diphenylethane-bis(N2 -benzylide-N1 - methylenebenzene-1,2-diamine). The complexes were characterized by FT-IR, UV-Vis and Cyclic Voltammetry. The radical polymerization of vinyl acetate (VAc) initiated by azobisisobutyronitrile (AIBN) was carried out under different reaction conditions in the presence of [Co(beb)](PF6)2 or [Co(bfb)](PF6)2 as mediators. The systematic variation of the reaction conditions, such as [initiator]/[Co] and [monomer]/[Co] molar ratios, affected the polymerization rates and the molecular weights, reaching a certain level of control. The [Co(beb)](PF6)2 complex was shown to be more efficient in controlling the polymerization of VAc when compared to the [Co(bfb)](PF6)2 complex.
Mougenot, Pierre. "Etude theorique ab initio scf et ci de complexes organometalliques binucleaires." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13025.
Full textSás, Juliana Frizarin Campos. "Síntese e aplicação de complexos de cobalto(II) coordenados a ligantes tetraimínicos na polimerização radicalar de acetato de vinila mediada por organometálicos /." São José do Rio Preto, 2017. http://hdl.handle.net/11449/150487.
Full textBanca: Daniela Martins Fernandes de Oliveira
Banca: Silvânia Lanfredi Nobre
Resumo: O trabalho reporta a síntese de dois novos complexos de cobalto(II), coordenados a ligantes tetraimínicos, estes foram denominados [Co(beb)](PF6)2 e [Co(bfb)](PF6)2. Os complexos foram caracterizados por Espectroscopia de Infravermelho (FT-IR), Espectroscopia de Ultravioleta-visível (UV-Vis) e Voltametria Cíclica (VC). A polimerização radicalar de acetato de vinila (VAc) foi iniciada pelo azobisisobutironitrila (AIBN) e realizada na presença de [Co(beb)](PF6)2 ou [Co(bfb)](PF6)2 como agentes controladores, a temperatura de 65 ºC. As massas moleculares de poliacetato de vinila (PVAc) foram analisadas por GPC e Cg
Abstract: This study describes the synthesis of two novel cobalt(II) complexes, coordinated to tetraimine ligands [Co(beb)](PF6)2 and [Co(bfb)](PF6)2, where beb = 1,2-diphenylethane-bis(N2 -benzylidene-N1 -methyleneethane- 1,2-diamine) and bfb = 1,2-diphenylethane-bis(N2 -benzylide-N1 - methylenebenzene-1,2-diamine). The complexes were characterized by FT-IR, UV-Vis and Cyclic Voltammetry. The radical polymerization of vinyl acetate (VAc) initiated by azobisisobutyronitrile (AIBN) was carried out under different reaction conditions in the presence of [Co(beb)](PF6)2 or [Co(bfb)](PF6)2 as mediators. The systematic variation of the reaction conditions, such as [initiator]/[Co] and [monomer]/[Co] molar ratios, affected the polymerization rates and the molecular weights, reaching a certain level of control. The [Co(beb)](PF6)2 complex was shown to be more efficient in controlling the polymerization of VAc when compared to the [Co(bfb)](PF6)2 complex
Mestre
Riga, Rocha Beatriz Aline. "Síntese de ligantes diimínicos para obtenção de complexos organocobalto(III) para polimerização radicalar mediada por cobalto /." São José do Rio Preto, 2017. http://hdl.handle.net/11449/149815.
Full textBanca: Giovana Gioppo Nunes
Banca: Sérgio Antônio Marques de Lima
Resumo: Neste trabalho objetivou-se a síntese e caracterização de oito complexos de cobalto(II) que fossem aptos a atuarem como agentes controladores na Polimerização Radicalar Mediada por Cobalto do monômero acetato de vinila. Através da modulação da esfera de coordenação destes complexos com a alteração dos efeitos estéricos e eletrônicos promovidos pela coordenação de ligantes α-diiminas, buscou-se estabelecer parâmetros para propor a forma como estes complexos mediam a CMRP do referido monômero. Os complexos foram divididos em dois grupos, objetivando uma avaliação mais eficiente da forma como os efeitos estéricos e eletrônicos interferem na capacidade controladora dos mesmos. Após a variação sistemática das proporções molares entre complexo, iniciador e monômero encontrou-se na proporção [Co]/[AIBN]/[VAc] = 1/3,25/542 os resultados mais satisfatórios deste trabalho. O uso de DMSO fora prejudicial para os complexos 2a-c, porém fez com que os complexos 2d-h apresentassem melhorias, reduzindo seus valores de polidispersidade e aumentando as massas moleculares dos polímeros. O complexo 2b fora escolhido como o melhor controlador do grupo do efeito estérico, por reunir em si as características estérias e eletrônicas que o fizeram apresentar os menores valores de polidispersidade (Đmáx = 1,43). Com relação ao grupo de complexos do efeito eletrônico, fora o complexo 2f que, devido à maior estabilidade estrutural conferida ao complexo por seu substituinte cicloexil,...
Abstract: This work aimed the synthesis and characterization of eight cobalt(II) complexes which could be able to act as controlling agents in vinyl acetate radical polymerization mediated by cobalt. By modulating the coordination sphere of these complexes, modifying the steric and electronic effects offered by the α-diimine ligands, we sought to establish parameters to propose how these complexes mediate the CMRP of vinyl acetate. The complexes were split in two groups in way to assess efficiently how the electronic and steric effects can affect the controlling capacity of the CoII(α-diimine).A systematic variation of the molar ratio such as [Co]/[initiator] and [Co]/[monomer] made it possible to choose [Co]/[initiator]/[monomer] = 1/3.25/542 as the ratio that provided certain level of control. The addition of DMSO was detrimental to the complexes 2a-c, but caused an improvement to the activity of complexes 2dh, reducing their polydispersity values and increasing the molecular weights of the polymers. Complex 2b was chosen as the best controller of the steric effect group, its steric and electronic characteristics made possible to reach the lowest polydispersity of its group (Đmax = 1.43).Regarding to the group of complexes of the electronic effect, it was the complex 2f that had the smallest polydispersity of its group, between 1.12 and 1.58, due to the greater structural stability conferred to the complex by its cyclohexyl substituent
Mestre
Silva, Yan Fraga da. "Polimerização radicalar de acetato de vinila mediada por novos complexos de Co(II) coordenados à bases de Schiff não simétricas /." São José do Rio Preto, 2019. http://hdl.handle.net/11449/182578.
Full textCoorientador: Valdemiro Pereira de Carvalho Júnior
Banca: Ana Maria Pires
Banca: Patrícia Alexandra Antunes
Resumo: Nas últimas décadas, a polimerização radicalar controlada (CRP) tem se tornado muito importante, pois permite a síntese de macromoléculas de arquiteturas específicas com um controle sobre as propriedades químicas e físicas. Sendo assim, este trabalho tem por objetivo a síntese de novos complexos de Co(II) coordenado a ligantes tipo Salen não simétricos. O precursor, os ligantes e os complexos foram caracterizados pelas seguintes técnicas: espectroscopia de absorção na região do UV-Vis, espectroscopia vibracional na região do infravermelho (FTIR), voltametria cíclica e Ressonância Magnética Nuclear (RMN 1H e 13C). Os complexos não simétricos contendo em sua composição aminas saturadas [CoII(CAYA 02)], [CoII(CAYA 03)] e o complexo contendo amina aromática [CoII(CAYA 04)] foram utilizados como mediadores na reação de polimerização radicalar controlada por organometálicos do acetato de vinila. Foram feitos estudos do efeito da temperatura na reação de OMRP (Polimerização Radicalar Mediada por Complexos Organometálicos) utilizando-se o complexo [CoII(CAYA 03)] sintetizado na razão molar de 1/3,25/542 (Co/AIBN/VAc). Após este estudo foram realizadas as cinéticas de polimerização para todos os complexos, pôde-se observar que cada complexo apresentou um perfil cinético de pseudo-primeira ordem com um aumento de Mn em determinados intervalos de tempo de acordo com a sua reatividade. Os complexos [CoII(CAYA 03)] e [CoII(CAYA 04)] apresentaram um aumento dos valores de Mn juntamente...
Abstract: In the last decades, controlled radical polymerization (CRP) has become very important because it allows the synthesis of macromolecules of specific architectures with a control over the chemical and physical properties. Thus, this work aims to synthesize new Co (II) complexes bound to non-symmetric Salen type ligands. The precursor, ligands and complexes were characterized by the following techniques: absorption spectroscopy in the UV-Vis region, infrared vibration spectroscopy (FTIR), cyclic voltammetry and Nuclear Magnetic Resonance (1H and 13C NMR). The non-symmetric complexes containing saturated amines [CoII (CAYA 02)], [CoII (CAYA 03)] and the aromatic amine-containing complex [CoII (CAYA 04)] were used as mediators in the radical polymerization reaction controlled by organometallic of vinyl acetate. It was studied the effect of temperature on the OMRP (Polymerization Radicalar Mediated by Organometallic Complexes) using the complex [CoII (CAYA 03)] synthesized in the molar ratio of 1 / 3.25 / 542 (Co / AIBN / VAc). After this study the polymerization kinetics were performed for all the complexes, it was observed that each complex presented a kinetic profile of pseudo-first order with an increase of Mn at certain time intervals according to their reactivity. The complexes [CoII (CAYA 03)] and [CoII (CAYA 04)] showed an increase of the Mn values together with the conversion maintaining the values of polydispersity (Ð) between 1 and 1,5 that characterizes the control of ...
Mestre
Biswas, Souvagya. "Asymmetric Catalysis of Carbon-Carbon Bond Forming Reactions: Use of a Sustainable Feedstock Ethylene." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1449830785.
Full textYang, Tsung-Yao, and 楊宗堯. "Cobalt Mediated Radical Polymerization of Vinyl Acetate: Mechanistic Studies." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/kjvp29.
Full textHsu, Chen-Shou, and 許鎮守. "Cobalt Porphyrins Mediated Living Radical Polymerization of Vinyl Acetate." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/35365905326002415256.
Full text國立清華大學
化學系
101
Cobalt porphyrins mediated vinyl acetate radical polymerization has been performed in different solvent environments and was found that a high monomer conversion (69%) with linear increased molecular weight versus conversion, narrow molecular weight distribution (Mw/Mn = 1.12 ~ 1.34), and little molecular weight deviation could be approached in bulk condition. However, different levels of molecular weight deviation occurred when polymerization was performed in solution, indicating that the control of vinyl acetate radical polymerization was affected by chain transfer to solvent. Besides, non-coordinating solvents caused a difference in polymerization rate mainly due to the different propagation rate constant (kp), but the coordinating solvents such as THF blocked the reaction site of cobalt porphyrins and interfered the whole polymerization behavior. The effect of radical concentration and the ratio of [VAc]0 / [CoII]0 have been also discussed. The higher radical concentration shortened the induction period, increased the polymerization rate and caused a slight deviation of molecular weight. But the control efficiency of cobalt porphyrins to vinyl acetate polymerization was not significantly affected by the ratio of [VAc]0 / [CoII]0. The coordinating effect of pyridine was demonstrated by the shift of equilibrium from dormant organo-cobalt(III) species to active cobalt(II) species. The equilibrium constant (Keq) was changed from < 10-12 to 5.2 × 10-8 when 25 equivalent of pyridine was added into the polymerization so that the major control process was switched from degenerate transfer to reversible termination. Polymerization of methyl acrylate mediated by cobalt porphyrins has been conducted in different solvents. The polymerization behaviors were similar in non-coordinating solvents. However, the induction period was shortened with coordinating solvents such as acetonitrile, anisole and THF which blocked the reaction site of cobalt porphyrins. When THF was used as an additive, the induction period was slightly decreased, but it showed no effect to the polymerization rate and the controlled efficiency.
Li, Jia-Qi, and 李家齊. "Polymerizaion of Vinyl Acetate and Methyl Acrylate by Various Bis(phenoxy-imine) Cobalt(II) Complexes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/w3ga55.
Full textSheng-ChaunChang and 張勝荃. "Synthesis of poly(vinyl acetate-co-methyl methacrylate) macromonomers by cobalt-catalyzed chain transfer and their graft polymerization with acrylonitrile." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/3guwct.
Full textIrshad, Ahamed M. "Electrochemical and Photoelectrochemical Investigations of Co, Mn and Ir-Based Catalysts for Water Splitting." Thesis, 2016. http://hdl.handle.net/2005/3099.
Full textWang, Yen-Hsiang, and 王彥翔. "Heterobimetallic Palladium-Cobalt Complex Catalyzed C-H Bond Nitrene Insertion of Sulfamate Esters, and Oxidation of Benzylic Acetal by(Diacetoxyiodo)benzene." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/h48f6x.
Full text中原大學
化學研究所
103
The presenting study can be divided into two parts. The first part of the study of sulfamate esters compound containing (six ring、five ring、four ring and Acetal group) as the starting materials in PdCo(OAc)4 catalyzed C - H amination reaction. Starting material with radical clock (cyclopropyl group) was alse tested in the C - H amination reaction to determine the possibility of radical mechanism. The second part is about using (diacetoxyiodo)benzene an oxidant for the oxidation of phenyl acetal compounds to form orthoesters.
Morifi, E. L. "Cobalt and cadmium chalcogenide nanomaterials from complexes based on thiourea, urea and their alkyl derivatives : synthesis and characterization." Thesis, 2015. http://hdl.handle.net/10352/302.
Full textCadmium and cobalt complexes of urea and thiourea were synthesized using ethanol as a solvent. All complexes were refluxed at 70 - 80 °C, left to cool at room temperature, washed with methanol and acetone to remove impurities and dried at an open environment. The characterization of complexes was done using FTIR spectroscopy, elemental analysis and TGA. The complexes were found to coordination with the ligands through sulphur and oxygen atoms to the metal, instead of nitrogen. These were as results of wavelength shifting from high to low frequency from spectra of the complexes as compare to their free ligands. These observations make these complexes good candidates for the possible use in synthesis of metal sulphides or oxides nanoparticles. Thermogravimetric analyses of all the complexes were conducted to check the stability of use as precursors for nanoparticles at low and high temperature. A number of thiourea and urea complexes with cadmium and cobalt have been prepared and used in the preparation of metal sulphides/oxides nanoparticles. Complexes start to decompose at low temperature about 100°C and the last decomposition step was at about 800-900°C, which is convenient to thermal decomposition of precursors in the high boiling solvents or capping agent to prepare surface capped metal sulphides/oxides nanoparticles. The complexes were easy to synthesize, low cost and stable in air and were obtained in reasonable yields. All the complexes reported in this study have been used as single source molecular precursor in the preparation of cadmium oxide, cadmium sulphide, cobalt oxide, cobalt sulphide nanoparticles (normal) and as mixture of any two complexes to form core-shells nanoparticles. Quality nanoparticles synthesis requires three components: precursors, organic surfactants and solvents. The synthesis of the nanoparticles can be thought of as a nucleation event, followed by a subsequent growth period. Both the nucleation and growth rates were found to be dependent upon factors such as temperature, growth time, and precursor concentration. For a continuous flow system the residence time (at nucleation and growth conditions) was also found to be important. In order to separate the nucleation and growth events, injection techniques were employed to achieve rapid nucleation of nanoparticles with final size dictated by the growth temperature and/or residence time through the growth zone of the reaction system. Good crystalline normal nanoparticles were obtained from thermolysis of the precursors in hexadecylamine (HDA) as the capping agent at fixed concentrations, temperature and time. All nanoparticles showed a blue-shift in band edges with good photoluminescence behaviour which is red-shifted from their respective band edges and XRD patterns, the crystal structure are in hexagonal phase. The particles showed rods, spheres and hexagonal shapes. Nucleation and growth mechanism brings new avenue in nanostructures called core-shells, which have been reported to have improved luminescence, quantum yields, decreased fluorescence lifetimes, and benefits related to the tailoring of the relative band-gap positions between the two materials. In this study cadmium and cobalt complexes of urea and thiourea were separately dispersed in TOP and injected separately (allowing nucleation/core to occur, followed by the shell) in hot HDA at 180ºC for 1hour to yield core-shell nanoparticles. Parameters, such as concentration, temperature and capping molecule as factor affecting nucleation and growth of the core-shells were monitored. The core-shell nanoparticles were characterized by UV/Vis spectroscopy, XRD and TEM. We observed spherical, tripod, bipods, hexagonal and irregular shaped nanoparticle as the concentration of the precursors was increasing, however we were able to form core-shells nanoparticles in one set of experiment 1:3 CdS-CdO, which are assumed to be a reverse type I coreshells nanoparticles. Exciton absorption peaks at higher energy than the fundamental absorption edge of bulk indicate quantum confinement effect in nanoparticles as a consequence of their small size. XRD patterns, crystals range from hexagonal, cubic and mixture of hexagonal and orthorhombic. A low temperature studies were also conducted a mixture of hexagonal and sphererical shapes with sheets like onion morphology were observed.
NRF HUB & SPOKES (VUT)
Davis, Belinda L. "Identification and characterisation of bacterial genes associated with resistance to and/or degradation of environmental pollutants." Thesis, 2011. https://vuir.vu.edu.au/16038/.
Full text