cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2005.1560
title: Linear low-density polyethylene/nano-silica composites synthesized via in situ polymerization with metallocene catalysts

description: It is known that linear low-density polyethylene (LLDPE) can be synthesized by copolymerization of ethylene and 1-olefins using metallocene catalysts. However, the mechanical properties of LLDPE can be improved by adding organic or inorganic fillers. It should be mentioned that by adding nanoscale fillers into LLDPE, LLDPE-nanocomposites can be achieved. Among methods to produce polymer nanocomposites such as solution blending, melt mixing process and in situ polymerization, the in situ polymerization is perhaps the most promising method to produce LLDPE-nanocomposite with an exceptional dispersion of nanoparticles throughout the polymer matrix. This is due to the direct linkage of active centers to the surface of nanoparticles. Therefore, it is necessary to immobilize the active centers onto nanoparticle surface or fillers. In this present study, LLDPE/SiO[subscript 2]-nanocomposites were synthesized by the in situ polymerization with methylaluminoxane (MAO)/zirconocene catalyst. Two types of SiO[subscript 2] were as the fillers. One type was the SiO[subscript 2] prepared by sol-gel method. The other was the commercial nanopowder silica with two different sizes (10 nm and 15 nm). All particles and the obtained LLDPE/SiO[subscript 2]-nanocomposites were further characterized
DOI: 10.14457/cu.the.2005.1561
title: Spatial interference cancellation and channel estimation for multiple-input multiple-output wireless communication systems

description: A multiple-input multiple-output (MIMO) wireless communication system is one of prominent systems for realizing high data-rate transmission services highly demanded in the future wireless communications. It can provide a significant performance enhancement to the wireless communications, including increased data rates through a multiplexing gain, an enhanced error probability through a diversity gain, and cancellation of multiple access interference through smart antennas. However, for such system employing coherent receivers, an accurate channel state information is crucially needed. These performance advantages and challenge, respectively, are the motivations of this dissertation. In the first part of this dissertation, a novel smart antenna system for interference canceling receivers in direct-sequence code-division multiple access (DS-CDMA) systems is proposed. This proposed scheme only exploits the spreading codes of users as the information forits weight adjustment for controlling its beam. This proposed scheme is also robust to the in-beam interference, especially in the near-far effect situation. Convergence and error probability performance analysis is also carried out. Theoretical and simulation results indicate that the proposed scheme outperforms the existing works. In the second part of this dissertation, novel channel estimators for space-time (ST) coded MIMO systems and for space-frequency coded MIMO-orthogonal frequency-division multiplexing (OFDM) systems are proposed, respectively. For the first systems, the novel pilot-embedding approach for joint channel estimation and data detection is first proposed. The unconstrained maximum likelihood (ML) and linear minimum mean square error (LMMSE) channel estimators are then proposed. Mean square error (MSE) of the channel estimation, Cramer-Rao lower bound, and Chernoff's bound of bit error rate for ST codes are analyzed for examining the proposed scheme's performances. The optimum power allocation is also investigated. Theoretical and simulation results show that a code-multiplexing based structure for the data-bearer and pilot matrices is the best among all other structures for nonquasi-static channels. For the second systems, a generalization of the proposed pilot-embedding scheme as well as the corresponding least square (LS) channel estimation and ML data detection are first proposed. Then, LS and adaptive LS FFT-based channel estimators are proposed to improve the performance of such channel estimator. The effect of model mismatch error for non-integer multipath delay profiles and MSE of these channel estimators are analyzed. The optimum number of taps for the adaptive LS FFT-based channel estimator is also determined. Theoretical and simulation results indicate that the adaptive LS FFT-based channel estimator is the best among all other channel estimators
DOI: 10.14457/cu.the.2005.1562
title: Preparation of chromium-titanium silicalite-1

description: This research has studied preparation and characterization of chromium-titanium silicalite-1 catalysts. In our study, every catalyst prepared by incorporation method composed of titanium about 2.22 %mol and chromium not over 0.5 %mol. From characterization, all synthesized samples have MFI structure and orthorhombic crystalline shape. Titanium and chromium atoms in the catalyst framework exist in form of tetrahedral, coordination number of both atoms are 4+ and 5+ respectively. Unlikely, some parts of chromium and titanium atoms are mantled in oxide form on the synthesized catalyst surface. Higher amount of loaded chromium increased the amount of Cr[superscript 5+] in the catalyst framework; in addition, weak acid site ratio and high oxidation state of chromium on the catalyst surface are also increased. Because of those properties, when the catalyst sample with higher loaded chromium is tested by 2-propanol oxidation, high selectivity of propylene isachieved. Only the sample with 0.15 % Cr yields high selectivity to acetone. To investigate on this sample, the surface analysis results suggest that the satisfied dispersion of Ti[superscript 4+] in the catalyst framework should be the reason for its unusual behavior
DOI: 10.6084/m9.figshare.12966998
title: Supplementary Material for: Dermatological Disease in Australian Heart and Lung Transplant Recipients

description: <b><i>Background:</i></b> Research examining skin disease in heart and lung transplant recipients in Australia is limited. This study aims to determine the spectrum of skin diseases encountered in Australian heart and lung transplant recipients, their effect on quality of life, and potential risk factors for skin cancer. <b><i>Methods:</i></b> Ninety-four participants were recruited from an Australian heart and lung transplant centre between March and December 2016. The participants were asked to fill out a questionnaire which included the Dermatology Life Quality Index and were examined for malignant and non-malignant skin disease. The association of study variables with the presence of skin cancer and Dermatology Life Quality Index score were examined using logistic regression analysis. <b><i>Results:</i></b> A dermatological diagnosis was made in 82 patients (87%). Actinic keratosis was the most common diagnosis, affecting 50 participants (53%), followed by skin cancer (41; 44%) and warts (14; 15%). Other non-malignant skin diseases were less common. Risk factors associated with skin cancer on multivariate modelling included age at transplantation and a history of ≥5 post-transplant skin cancers. Skin disease had a negative effect on the quality of life of a minority of patients. <b><i>Conclusion:</i></b> Actinic keratosis and skin cancer are very frequent in Australian heart and lung transplant recipients and more common than non-malignant skin diseases. Routine dermatological surveillance at regular intervals is advised.
DOI: 10.14457/cu.the.2005.1563
title: Effect of calcination conditions on hydrophilicity of titanium dioxide films

description: Titanium dioxide was prepared via a sol-gel method using titanium isopropoxide as a precursor. Borosilicate glass slide was employed as a support for titanium dioxide thin film. Calcination conditions, namely, calcinations temperature and calcinations atmosphere, were varied to investigate their effects on hydrophilic property of titania thin films. Titania thin film that was calcined under stagnant air at 550 ํC possessed the smallest saturated contact angle. As calcinations temperature decreased, the saturated contact angle of the sample grew larger. The increase was attributed to lower Ti[superscript 3+] surface defect and the presence of less rutile phase in the sample. Regarding calcinations atmosphere, the smallest saturated contact angel was observed in the sample that was calcined under stagnant air probably due to the highest Ti[superscript 3+] surface defect. Then further surface modification of the sample was done by employing two-step calcinations process. The first step involved calcinations under air flow so as to transform amorphous titania to titania crystals. The, the sample was calcined under hydrogen flow in the second step to create more Ti[superscript 3+] surface defect. We found that small saturated contact angle could be obtained even at a lower calcinations temperature by using the two-step calcinations process, when compared to the single-step calcinations process
DOI: 10.14457/cu.the.2005.1564
title: Dienes effects on terpolymerization of ethylene propylene and diene with ethylenebis (indenyl) zirconium dichloride/methylaluminoxane catalyst

description: Copolymerization of ethylene (E) and propylene (P) with and without diene addition were performed using rac-ethylenebis(indenyl)zirconium dichloride (Et[Ind][subscript 2]ZrCl[subscript 2]) catalyst system in the presence of methylaluminoxane (MAO) as a cocatalyst. Batch and semibatch reactor system were used. The different types of diene i.e. 1,4 HD, 1,5 HD, ENB, VCH and COD were chosen. A small amount of dienes added could have impact on behaviors of ethylenepropylene (EP) copolymerization. In the batch reactor system, the addition of dienes resulted in a slight decrease in polymerization activities. Furthermore, the types of diene did not exhibit any differences in activity. The addition of dienes can alter the incorporation of ethylene and propylene in the polymer backbone according to different types of diene used. The dienes (except for ENB) did not incorporate in the polymer backbone pronouncedly. In addition the melting temperature of EP elastomers increased with the addition of dienes. For the semibatch reactor system, the activities decreased with diene addition in all E/P ratio. However, the activities increased with decreasing the E/P ratio. It was found that only ENB, 1,4 HD and 1,5 HD can incorporate in the polymer backbone. The melting temperature of EP elastomers tended to increase with the addition of dienes. In addition, the thermal properties are also dependent on the fraction of ethylene and propylene in the polymer backbone. It was concluded that the addition of only a small amount of dienes could alter the behaviors of EP copolymerization. In particular, changes in polymerization behaviors were dependent on E/P ratios and types of diene
DOI: 10.14457/cu.the.2005.1565
title: Selective hydrogenation of acetylene on palladium catalysts supported on titanium dioxide consisting of various rutile

description: Effect of titania consisting of various phase compositions on Pd and Pd-Ag catalysts for selective acetylene hydrogenation has been studied. Increasing amount of %rutile phase in the TiO[subscript 2] resulted in a decrease in BET surface areas, lower amount of Ti[superscript 3+] sites, and lower Pd dispersion. Acetylene conversion was found to be merely dependent on Pd dispersion while ethylene selectivity appeared to be strongly affected by the presence of Ti[superscript 3+] in the TiO[subscript 2] samples. When TiO[subscript 2] samples with 0-44% rutile were used, high ethylene selectivities were obtained whereas ethylene losses occurred for those supported on TiO[subscript 2] with rutile phase 85 or 100%. XPS and ESR experiments revealed that significant amount of Ti[superscript 3+] existed in the TiO[subscript 2] samples composed of 0-44% rutile. The presence of Ti[superscript 3+] in contact with Pd can probably lower adsorption strength of ethylene resulting in an ethylene gain. Among all the catalysts used in this study, the results for Pd/TiO[subscript 2]-R44 suggest an optimum anatase/rutile composition of the TiO[subscript 2] used to obtain high selectivity of ethylene in selective acetylene hydrogenation. In addition, pure anatase titania has been prepared by solvothermal and sol-gel methods and employed as supports for Pd and Pd-Ag catalysts. BET surface area of the solvothermal TiO[subscript 2] was less than that of sol-gel TiO[subscript 2], However, due probably to the different synthesis routes, the amount of Ti[superscript 3+] sites on the TiO[subscript 2] prepared by solvothermal method were higher than the one prepared by sol-gel method. It was found that acetylene conversion and ethylene selectivity of Pd catalyst supported on solvothermal TiO[subscript 2] with higher Ti[superscript 3+] sites were lower than those of sol-gel TiO[subscript 2] supported one. Acetylene conversion and ethylene selectivity of Pd-Ag catalyst were found to belower than that of single metal Pd catalyst supported on TiO[subscript 2] containing Ti[superscript 3+]. However, the presence of Ag improved significantly ethylene selectivity ofthe catalysts without Ti[superscript 3+] presented. In conclusion, this study reveal both Ti[superscript 3+] and the strong-metal support interaction (SMSI) presented in Pd and Pd-Ag supported on TiO[subscript 2] significantly affect the catalyst performance in selective hydrogenation of acetylene
DOI: 10.14457/cu.the.2005.1566
title: Optimization algorithms for transmit power minimization based on partial channel state information in mimo systems

description: Although frequency spectrum is infinite, only a very limited range of spectrum can be utilized for wireless communications with current technology. As wireless communications evolve to the Fourth Generation (4G), frequency utilization becomes a challenge since much higher data rate is expected. Frequency spectrum for new wireless systems is scarce and expensive. It is desired to maximize the transmission rate within limited bandwidth. This demand can not be met without a significant change in spectral efficiency. Transmission over Multiple-Input Multiple-Output (MIMO) systems most promising solution. Multiple antennas are employed at both transmitter and receiver, using the same frequency spectrum. In this thesis, Orthogonal Frequency Division Multiplexing (OFDM) systems in combination with MIMO transmission are considered. Only partial channel state information (CSI) at transmitter is assumed. The transmitter design with coder-beamformer is adopted to increase system robustness against uncertainties of statistical CSI. Since optimal bit allocation is of high complexity, this thesis proposes a novel algorithm for minimizing transmit power in MIMO-OFDM systems. The proposed scheme has better performance and lower complexity than existing algorithm when average number of bits per sub-channel is small with respect to constellation size.
DOI: 10.14457/cu.the.2005.1567
title: Characteristics and catalytic properties of mixed nano-gamma-alumina based-supported cobalt catalyst during carbon monoxide hydrogenation

description: In the present study, the physicochemical properties of cobalt oxide species dispersed on different micron- and nanoscale mixed alumina-zirconia supports were investigated. The samples were prepared by impregnation of the cobalt precursor onto the various mixed alumina-zirconia supports. After calcinations, the samples were characterized with different techniques. TEM revealed that the size of cobalt oxide species depended on the size of supports used. For pure micron- and nanoscale alumina supports, it was found that the catalyst exhibited the similar activities and selectivity. However, increased activity was observed when the nanoscale zirconia support was used compared with the micronscale one. Considering the mixed alumina-zirconia supports, for the micronscale ones it indicated that the presence of zirconia had no effect on both activity and selectivity during carbon monoxide hydrogenation. However, the presence of the nanoscale zirconia in nanoscale alumina apparently resulted in decreased activities, but somehow increased selectivity to 2-3 atomic carbon products. Differences in activity and selectivity can be attributed to the support interaction and the particle size of cobalt oxide species along with the nature of support itself.
DOI: 10.14457/cu.the.2005.1568
title: Solid-state mechanical properties and microstructure of polypropylene/nylon-6 clay nanocomposities

description: To study the mechanical properties and microstructure of polypropylene/nylon 6 nanocomposites. Polymer blends of polypropylene (PP) and nylon 6 (Ny6) were used as a matrix. The nano-filler used to improve the mechanical properties of polymer blends was organoclay. Organoclay (Org-MMT) was treated by quatermary ammonium compound acting as reinforcing filler. Compatibilizer, PP-MA, was used to improve the adhesion between phase and dispersion of Org-MMT in matrix. The mechanical properties and microstructure of the composite that processed by twin screw extruder were investigated at different amount of compatibilizer and Org-MMT. By adding 9.5wt% of PP-MA in polymer blends, tensile modulus and elongation at break increased by 21% and 99%, respectively. Improvement of adhesion and dispersion between PP and Ny6 was improved by adding PP-MA as shown in Scanning Electron Microscopy (SEM) micrograph. The result of physical reacting between maleic anhydride and amine of nylon 6 was supported by dynamic mechanical analysis (DMA). Moreover, by adding PP-MA, the crystallinity of Ny6 was decreased which confirmed by DSC thermograms and XRD results. The increasing of PP-MA in nanocomposites decreased tensile modulus and elongation at break of the composites. However, the presence of Org-MMT as reinforcement showed the decreasing of tensile modulus and viscosity as a function of Org-MMT due to the good dispersion of Org-MMT in matrix. X-ray diffraction (XRD) and Transmission electron microscopy (TEM) can be verified the insertion of polymer and dispersion between galleries. Furthermore, the thermal stability of nanocomposites observed by DMA showed higher glass transition temperature than polymer matrix.
DOI: 10.14457/cu.the.2005.1569
title: Role of water vapor in photocatalytic oxidation of ethylene over titanium dioxide in gas phase

description: The photocatalytic oxidation of ethylene was studied in a packed bed reactor using titanium dioxide that was prepared by a sol-gel method as a catalyst. Effects of several reaction parameters, namely, flow rate of reactant, humidity level, and temperature, on the kinetics of the photocatalytic oxidation process were investigated. Nonlinear regression analysis was employed to fit few proposed rate expression to the kinetic data. A Langmuir-Hinshelwood-Hougen-Watson rate expression was applied to describe the behavior of photocatalytic oxidation of ethylene and could give an adequate fitting to the kinetic data. The reaction rate of ethylene decreased with increasing relative humidity but increased with increasing reaction temperature. Water competes with ethylene for adsorption sites on titanium dioxide surface. The activation energies for the reaction were 25.02 and 6.78 kJ/mol at 0 and 100% relative humidity, respectively. The standard enthalpies ofadsorption for ethylene were -11.3 and -15.8 kJ/mol at 0 and 100% relative humidity, respectively
DOI: 10.5281/zenodo.4034173
title: Corrected super-resolution microscopy enables nanoscale imaging of auto-fluorescent lung macrophages

description: Observing the cell surface and underlying cytoskeleton at nanoscale resolution using super-resolution microscopy has enabled many insights into cell signalling and function. However, the nanoscale dynamics of tissue-specific immune cells have been relatively little studied. Tissue macrophages, for example, are highly auto-fluorescent, severely limiting the utility of light microscopy. Here, we report a correction technique to remove auto-fluorescent noise from Stochastic Optical Reconstruction Microscopy (STORM) datasets. Simulations identified a moving median filter as an accurate and robust correction technique. Using this, we were able to visualise lung macrophages activated through Fc receptors by antibody-coated glass slides. Accurate, nanoscale quantification of macrophage morphology revealed that activation induced the formation of cellular protrusions tipped with MHC class I protein. These data are consistent with a role for lung macrophage protrusions in antigen presentation. We further show that the tetraspanin and extracellular vesicle (EV) marker CD81 appears in ring-shaped structures (mean diameter 93 ± 50 nm) at the surface of activated lung macrophages, likely marking the secretion of extracellular vesicles. Moreover, this correction method for super-resolution microscopy is widely applicable to other challenging biological samples.
DOI: 10.5281/zenodo.4034228
title: Slideseq cerebellum and scRNAseq cerebellum

description: Contains the slideseq cerebellum dataset (Science paper), and the single-cell RNAseq L1 cerebellum dataset (from mouse-brain.org). For use with Giotto, and Giotto dataset tutorials.
DOI: 10.5281/zenodo.4034227
title: Slideseq cerebellum and scRNAseq cerebellum

description: Contains the slideseq cerebellum dataset (Science paper), and the single-cell RNAseq L1 cerebellum dataset (from mouse-brain.org). For use with Giotto, and Giotto dataset tutorials.
DOI: 10.14457/cu.the.2005.1556
title: Extraction of cassava starch using polyoxyethylene sorbitan monooleate as surfactant

description: The extraction of cassava starch using polyoxyethelene sorbitan monooleate (Tween 80) as surfactant was investigated. The experiment was conducted in a batch system. The study was divided into two sections. In the first section, the amount of water required for extraction of starch from cassava root and the stirring time were varied to find optimum conditions. Mass fraction of liquid and dry solid (L/S ratio) were varied at 10.5, 12.0, 13.5, 15.0, 16.5, 18.0, and 19.5, respectively. The stirring time were varied between 2 to 14 minutes. In the second section, effect of surfactant on extraction of starch from cassava root was studied. The parameters for extraction of starch were concentration of tween 80 solution (0.25%wt, 1%wt, and 3%wt), stirring time (2 to 14 minutes) and the mass fraction of liquid and dry solid (10.5, 12.0, 13.5, and 15.0). Results showed that extraction efficiency of starch extraction increased with amount of water and stirring time. The optimum conditions for extraction of starch were stirring time of 10 minutes and the mass fraction of liquid and dry solid (L/S ratio) of 15. Under these conditions, the extraction efficiency was found to be 73%. Addition of polyoxyethelene sorbitan monooleate (Tween 80) at concentrations higher than the critical micelle concentration enhanced starch extraction efficiency. The extraction efficiency increased with the increase L/S ratio and concentration of tween 80 solution