methods for investigation of their crystallographic structures and mechanical properties

... specification of NDT methods for quality assurance of deep foundations and concrete repairs This increased use of NDT methods is occurring despite the lack of testing standards for many of the methods ... applied for the investigation of concrete structures This increase in the application of NDT methods is due to a number of factors: • technological improvements in hardware and software for data ... The development of testing standards is critical for proper application and expanded use of NDT methods for evaluation of concrete constructions Traditionally, quality assurance of concrete construction...

Ngày tải lên: 24/10/2014, 17:44

... molecular placement, are good candidates for the construction of fine microstructure Compared with normal rigid building blocks, the jacketed polymers have great advantages for the synthesis In our ... interaction between theses groups is expected to help the self-assembly of the polymers The length of the alkyl chain and position of the alkyl chain on the mesogenic units appears to have significant ... transition at 81.1 and 76.2 °C were observed XRD patterns indicated a layer distance d of 21.2 Å and 18.6 Å, respectively The results reported here demonstrated that the meophase of the terphenyl-incorporated...

Ngày tải lên: 16/09/2015, 17:11

... Optical properties The spectroscopic properties of polymers 3a, 3b and 3c were measured in chloroform solution The absorption and emission spectra of the polymers are shown in Fig.5.3 and the ... system and Waters Styragel HR 4E columns using THF as eluent and polystyrene as standard UV and fluorescence spectra were performed on a HP 8452A spectrophotometer and SHIMDZU RF 500 spectrofluorophotometer ... absorption and Fluorescence spectra of polymers measured in chloroform at room temperature Table 5.2 The detailed data of UV-vis absorption and Fluorescence spectra polymer 3a, 3b and 3c Polymer...

Ngày tải lên: 16/09/2015, 17:11

... side-chain, and network structures, have been prepared by the self-organization of polymers and small molecules The noncovalent interactions play a key role in the formation of assembled structures, and ... increase of the peak at around 1190 cm -1 means the increase of the SO3- groups upon deprontonation, which support the formation of the complexes A shift of 57 cm-1 corresponding to the formation of ... to be promising for the development of smart materials that are characterized by the formation of supramolecular structures through self-assembly process Self-assembled materials formed by the...

Ngày tải lên: 16/09/2015, 17:11

... 4.74 o and 10.4o, from which d spacings of 18.6 and 8.5 Å are derived The existence of long-range order in the polymer lattice rules out the possibility of the nematic phase formation and reinforces ... Polymerization of 8-C10 was performed according to the procedure described for P1-C1 From 0.85 g (1.3 mmol) of monomer 8-C10 and 0.008 g (1 wt%) of BPO was obtained 0.5 g (58.8 %) of the desired ... Polymerization of 10-C1 was performed according to the procedure described for P1-C1 From 0.64 g (0.8 mmol) of monomer 10-C1 and 0.006 g (1 wt%) of BPO was obtained 0.4 g (62.5 %) of the desired...

Ngày tải lên: 16/09/2015, 17:11

... (TGA) and the results are given in Figure 2.2.2 All polymers showed a weight loss at 285-305 °C (285 °C for P03, 289 °C for P04, 302 °C for P02 and 69 305 °C for P01) Typically, the polymers P03 and ... spacings of 35.9Å, 30.6 Å and 18.0 Å are derived It also offers a sharp reflection in the middle angle region and a broad halo at 2θ = 7.42 and 19.9 °, from which d spacings of 11.9 Å and 4.5 ... 4.5 Å are derived P01 affords a sharp reflection in middle angle region and a broad peak at 2θ = 7.52 and 20.2°, from which a d spacing of 11.8 and 4.4 Å is derived For P02 and P04, the diffraction...

Ngày tải lên: 16/09/2015, 17:11

... arrangement of a polymer chain This stiffness may contribute to the formation of supramolecular structures and is used to demonstrate the correlation between chemical structure and performance in ... the concentration of the initiator and the monomers22 2.1.3.2 NMR and FTIR analysis The structures of all monomers and polymers prepared in our work were characterized by 1H NMR and FTIR Figure ... polymer conformation and DP is opposite to that seen in most synthetic and natural macromolecules This may provide a new method for the design of organized supramolecular materials for nanotechnology,...

Ngày tải lên: 16/09/2015, 17:11

... great fortune to work with Prof Li Yi and Prof Carl V Thompson during the past years of my PhD endeavor Both professors are distinguished scientists in their respective fields of expertise and ... Chapter Background: mechanical properties of materials and beam mechanics for analysis of thin film stresses - 57 2.1 The elastic and plastic responses of materials ... Stoney formula 68 2.2.2.3 The extended Stoney formula for films of arbitrary thickness 73 2.2.2.4 The substrate curvature for non-uniform mismatch strains and elastic properties...

Ngày tải lên: 11/09/2015, 09:16

... noncollapsible backbones and lumens of various sizes These structures are very interesting because of their unique properties that differ from their linear analogues However, examples of these molecules ... such as oligonucleotides and proteins The aim of this thesis was to investigate the structural and physical properties of a 13 new class of backbone-rigidified molecular strand with repeating aromatic ... could be observed due to the presence of hydrogen bond located at only one side of the strand For example, oligoamides of 6-alkoxy-5-aminopicolinic acid form linear motif in which the amide protons...

Ngày tải lên: 10/09/2015, 15:49

... the crystal structures of a series of oligomers, which allows a qualitative correlation between the conformational stability of the H-bond enforced backbones and the 18 strength of individual ... hexamer The interplay of π-π stacking and van der Waals’ interactions provide the driving forces for the observed formation of columns With their persistent shapes, tunable sizes and tendency to aggregate ... chloroformate, 4-methylmorpholine, CH2Cl2, 1t (for 2b) or 1k (for 2d) or 1l (for 2e), RT, 72~77%; c) ethyl chloroformate, 4-methylmorpholine, CH2Cl2, 1k, RT 67~83% Scheme 2.3 Synthesis of Hexamer...

Ngày tải lên: 10/09/2015, 15:49

... 6a in mixed solvents containing hexane and chloroform 91 (1:1 v/v) for 5a and hexane and dichloromethane (1:1 v/v) for 6a at room temperature Their crystal structures viewed along or perpendicular ... protons and their adjacent interior methoxy protons, (f) Chemical structure of 6b More NOESY, ROESY and TOXSY studies of 6b were demonstrated in Figure 3.8 and Figure 3.9 Figure 3.8c and 3.8d ... per turn and has a typical pitch of ~ 3.4 Å All these results were in agreement with previous studies of pentamer and hexamer Hereto, the similarity of helical conformation in hexamer and heptamer...

Ngày tải lên: 10/09/2015, 15:49

... ppm as a result of the H-bonding ability of DMSO 4.2.7 Crystal Structure of a Tetramer and Computational Molecular Modeling of Circular Pentamer To demonstrate the existence of intramolecular ... freedom of the aryl-amide bonds to enforce a crescent structure, X-ray crystallography of tetramer 8h was obtained by slow evaporation of 8h in mixed solvents of 1:1 dichloromethane and methanol ... presence of the bulky benzyloxy group does not disrupt the crescent-shaped conformation In addition, the H-bond distances of F•••NH and OH•••NH are no more than 2.3 Å, indicating the formation of intramolecular...

Ngày tải lên: 10/09/2015, 15:49

... selective for telo23 DNA sequence.33 In the study of G-quadruplex structure, effective assays are required for studying the G-quadruplex formation and for determining the interaction between ligands and ... affinities of these aromatic oligomers have also been studied For example, Figure 5.8 showed the effect of 10b on the formation of double-stranded DNA by PCR a) b) Figure 5.8 Effect of 10b and 9a ... analysis of inhibitory effect of 10a in 50 mM NaCl, (d) PAGE analysis of inhibitory effect of 11a in 50 mM KCl and (e) PAGE analysis of inhibitory effect of 11a in 50 mM NaCl (f) Comparison of inhibitory...

Ngày tải lên: 10/09/2015, 15:49

... spectra of gold nanoparticles before and after modification with DNA Two Thrombin aptamers TBA (15-mer) and TBA2 (29-mer) and their analogues were chemically coupled to AuNPs via the formation of ... 6.2.4 Sensitivity of Double Aptamer Biosensors for Thrombin Detection Au-T5 and Au-T6 are the AuNPs modified with thrombin aptamers TBA and TBA2, respectively, and are designed for the double-aptamer ... of Au-T5 and that with added thrombin of different concentrations Surprisingly, both the solution color change and the UV spectrum shift indicate that the aggregation of AuNPs also occurred for...

Ngày tải lên: 10/09/2015, 15:49

... efficient and specific identification of G-quadruplex-binding ligands Figure 7.13 Aggregation states of Au-TBA in the presence of both lysozyme and pentamers: (a) 10a, (b) 11a , (c) 10b, (d) 9a, and ... oC for 30 s, 47 oC for 30s and 72 oC for 30 s PCR products were resolved on 20% native polyacrylamides gels in 1*TBE buffer and stained with Sybe Gold The intensity of Sybe Gold by measured and ... insoluble strands of fibrin, and catalyze many other coagulation-related reactions Therefore, thrombin is usually considered as an important target when searching for anti-coagulants and antithrombotics...

Ngày tải lên: 10/09/2015, 15:49

... (5.9%) of the library based upon the number of unisequences and the proportion of contigs composed of a high number of sequences For example, CL1contig48 is composed of 496 aligned sequences and ... performed on leaf, stem, and pod cDNA led to the elimination of TC197, cons15 and TC185 due to the variability of their expression levels (data not shown) The stability of the expression level of ... great source of nutrition for millions of people and is the second most important legume crop, after soybean It is the target of multiple pests and diseases causing substantial losses For example,...

Ngày tải lên: 12/08/2014, 03:20

... characterization of complex electromagnetic systems Efficient numerical tools give engineers and designers an upper hand of assessing the performance of their design ahead of physical prototyping and measurement ... gratitude to my parents, Varadarajulu and Nagama Devi, and my siblings, Naren and Meera, for their love, understanding and support throughout my life i TABLE OF CONTENTS Page Acknowledgments ... Varadarajulu and Nagama Devi, my brother, Naren and my sister, Meera ACKNOWLEDGMENTS I wish to thank Prof Joshua Li Le-Wei and Prof Robert Lee for their guidance, inspiration, encouragement and support...

Ngày tải lên: 14/09/2015, 11:39

... particle size and size dispersion also can be interpreted based on the rate of nucleation and growth processes At lower temperatures of 25 and 40 °C, the times for the formation of stable absorption ... nucleation along with formation of more nuclei The mixture of small particles (nuclei) and larger particles in the TEM images in Figure 3C and D provides evidence for the beginning of a simultaneous ... with a population of larger particles of fairly uniform size in the TEM images in Figure 3D and E during the early time periods (10À30 min) of the formation process The mixture of sizes also is...

Ngày tải lên: 18/09/2013, 21:27

... to make a detailed study of linguistic exact and deep understanding of the way of using words and writing features of EIUFs and VIUFs in terms of lexical, syntactic, and semantic sentences in ... manufacturing of companies Therefore, “A Study of Linguistic Features of Instructions for Use of Foodstuffs in English and 1.1 RATIONALE Vietnamese” is the title of the master thesis I wish to perform ... further investigation into the field of IUFs, I would like to offer some suggestions for further research: An investigation into cohesive devices of instructions for use of foodstuffs in English and...

Ngày tải lên: 26/11/2013, 13:23

... performance characteristics and mechanical properties of bamboo Dissertation, Chinese Academy of Forestry, Beijing, China pp 147 Yusoff, M.N.M, A Abd.Kadir, and A.H Mohamed 1992 Utilization of ... utilization The physical and mechanical properties of bamboo vary with the age of the bamboo and the height of the culm [Chauhan 2000] In general, SG and the properties of bamboo drop from the ... outlook study on the trends of demand for wood products, there will be an increase in demand of the order of 20% by 2010 The current concern is whether this future demand for forest products can be...

Ngày tải lên: 22/02/2014, 09:20