In this Thesis, we propose a Cluster-based TDMA (CBT) scheme for Vehicular Ad-hoc Networks (VANET). In the CBT, the collision problems can be solved when packets are transmitted at the same time. In the Intra-cluster communications, the VANET Coordinator (VC) is determined by randomly choosing a number of zero or one. Other VANET Nodes (VNs) then randomly select different time slots to transmit their Bandwidth Requests (BRs). If more than two VNs choose the same slots for BRs, collision will occur. The failed VNs will continue to issue BRs in the next TDMA frames. After the time slots are scheduled by VC, all VNs can use the designated time slots to send data. In the Inter-cluster communications, when two clusters are approaching to each other, two VCs must exchange Slot Allocation MAP (SAM) using the random zero-or-one scheme. The VCs successfully receive SAM must reschedule the time slots. For the purpose of performance evaluation, we calculate the average time slots of selecting VC and the average time slots required for successful BRs. We also compute the average time slots required for successfully transmitting SAM and the average time slots required for broadcasting SAM to all VNs. Finally, we calculate the average time slots required for waiting before data transmission. To validate the mathematical results, we perform a simulation written in C++. When comparing the mathematical results to the simulation results, we observe that in the average time slots required for BR, the former is larger than the latter. This is because in the mathematical equations it is difficult to specify which time slots are used by VNs to transmit BRs. However, the rest of performance comparisons, the two results are very close.

The hydrodynamic excitation and response behavior of multi-body systems with varying degrees of coupling presents many challenges for designers of offshore structures. In this study, attention is focused upon the analysis and interpretation of experimental data obtained for an unmanned deepwater mini-Tension Leg Platform (mini-TLP) coupled to a tender barge. Each body has its own mooring system and the bodies are connected by two breast lines extending from central points on the mini-TLP to central points on the bow and stern of the tender barge. A fender system is located between the two platforms. Thus the two floating bodies are constrained to move together in surge and yaw while they are free to move independently in heave, roll and pitch with some limitations on sway. The data of the individual records are characterized using statistical moments, including skewness and kurtosis, to examine the degree of non-Gaussian behavior. Correlation analysis and cross spectral analysis are used to investigate the relationships between selected measurements such as the motion of each vessel, tensions in the mooring lines and tendons and the forces on the fenders. The analysis shows that the coupling effects reduce the mooring line and tendon tensions significantly and that the motions of the two vessels influence the line tensions and fender forces. The data distribution patterns followed by the parameters and the corresponding extreme values are also investigated.

Thesis (M. Soc. Sc.)--University of Hong Kong, 1981.

Tidigare forskning har visat att det finns ett samband mellan personlighetsdraget neuroticism och yttre motivation, a-motivation, låg självkänsla samt negativ affekt. Syftet med studien var att öka förståelsen för neuroticism som personlighetsdrag utifrån individernas motivationstyp, självkänsla samt individernas affektiva tillstånd. Studien undersökte även reliabiliteten hos instrumentet Mini-IPIP som har undersökt personlighetsdrag inom Big-five-teorin. Syftet testades med hjälp av fyra självskattningstester. Dessa var Mini-IPIP, Situational Motivation Scale (SIMS), Positive Affect and Negative Affect Scale (PANAS) samt Rosenbergs Self-esteem Scale (SES). I studien deltog N=110 deltagare i åldrarna 19-53 år. I avsikt att bättre förstå neuroticism och dess relation till motivation, självkänsla samt affekt genomfördes statistiska analyser såsom korrelation och regressionsanalys. Resultatet visade, med hjälp av en korrelation, att det fanns ett samband mellan negativ affekt och neuroticism som personlighetsdrag. Regressionsanalysen bekräftade samband mellan neuroticism som personlighetsdrag och motivationstyperna a-motivation samt yttre motivation. Dock kunde inget samband mellan neuroticisms och självkänsla bekräftas.

Three iron oxide materials have been studied for uptake of three anions (arsenate, phosphate and fluoride) and a cation (cadmium) from aqueous solutions. Two of the materials were produced using original procedures developed at Loughborough University. The former material was conditioned by a controlled freeze-thaw procedure to enhance granularity and the latter was air-dried at room temperature. Their capacities were compared with a commercially available material supplied by GEH Wasserchemle, Germany. Pore size distributions and specific surface area values were determined by N2 analysis at 77 K. All samples possessed a reasonable specific surface area, in the range 200-300 m2/g and were mesoporous. Samples produced at Loughborough University also contained some macropores, evidence of a more amorphous structure or lack of pH control during production. X-ray diffraction indicated that all samples had some b-FeOOH present and that the chloride content and production pH affected the material crystallinity. Crystallinity increased with increasing chloride content and a higher production pH resulted in the presence of more than one phase. Chemical characterisation was also completed on all three samples. The point of zero net proton charge and isoelectric point for each material was obtained by potentiometric batch titrations and zeta potential measurements respectively. The difference in these values increased with a higher chloride content and all samples studied possessed a positive surface at low pH and negative surface at high pH. These parameters were not greatly affected by the background electrolyte concentration, implying that the background electrolyte is not specifically adsorbed. However, arsenate and phosphate appeared to be specifically adsorbed as the isoelectric point decreased. The uptake capacities for arsenate, phosphate. fluoride and cadmium of all three samples were obtained by measuring batch isotherms at 25 degrees C. The pH range was 4-9, using various initial concentrations up to a maximum of approximately 30 uM. For all anionic species studied, the capacity decreased with increasing pH, and the reverse trend was noted for cadmium. The Langmuir model provided a good fit for the anionic isotherms and the Freundlich model for the cationic isotherms. The materials studied possessed a markedly higher capacity for fluoride than arsenate and phosphate, with an intermediate capacity for cadmium. This indicates that fluoride is attached to the surface via monodentate (single) bonds, whilst both arsenate and phosphate are primarily attached to the surface via bidentate (two) bonds. Cadmium is probably bound by both these mechanisms. The effect of competing anions on arsenic uptake capacity was determined using mini-column experiments of binary (arsenate-fluoride, arsenate-Phosphate and phosphate-fluoride) and ternary (arsenate-fluoride-phosphate) mixtures. Arsenate removal was strongly affected by the presence of phosphate, but was only slightly lower in the presence of fluoride. (Continues...).

The present elemental analysis workhorse worldwide is Inductively Coupled Plasma (ICP) Atomic Emission Spectrometry (AES) and Mass Spectrometry (MS). Due to the high power requirements, large gas consumption and the more obvious attribute, size, the ICP is tethered to the lab. Usually, samples must be collected, bottled, sometimes stabilized by acids and then shipped back to the lab for analysis (hours to days to weeks turnover rate). Due to the demand for a portable analyzer this thesis will focus on further development of microplasma devices (MPDs) for portable on-site analysis, in (near) real-time. Mini-In-Torch Vapourization (mini-ITV) is the sample introduction method for MPDs which removes the need for sample preparation (further necessitates portability). Mini-ITV introduces the sample into the MPD via electrothermal vapourization of a dry (water-free) nano- to micro- volume sample. Pneumatic nebulization, the commercially available ICP sample introduction method would extinguish the microplasma. Microplasma stability is the first issue addressed by confining the microplasma to a quartz tube (“wall-stabilized”) in hopes of a more stable MPD background emission. Once stabilized MPD conditions were found key microplasma parameters were studied including MPD power, HVac frequency, operating mode, inter-electrode distance (IED) and observation location, in hopes of improved MPD analytical performance. Microplasma excitation mechanism and maximum energy available in the microplasma for analyte are discussed. Some fundamental characteristics such as excitation temperature (Texc) and changes in atom/ion population with variation in some of the key MPD parameters were also determined.

Thesis (M. Econ.)--University of Hong Kong, 1995. / Xeror copy of the typescript. Includes bibliographical references (leaf 27).

Thesis (M.Soc.Sc.)--University of Hong Kong, 1981. / Also available in print.

Bachelor-Arbeit Univ. St. Gallen, 2005.

Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T13:30:32Z No. of bitstreams: 5 24.pdf: 288332 bytes, checksum: 520195a14408865261a68ead5a355da8 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2015-02-27T16:56:16Z (GMT) No. of bitstreams: 5 24.pdf: 288332 bytes, checksum: 520195a14408865261a68ead5a355da8 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) / Made available in DSpace on 2015-02-27T16:56:16Z (GMT). No. of bitstreams: 5 24.pdf: 288332 bytes, checksum: 520195a14408865261a68ead5a355da8 (MD5) license_url: 49 bytes, checksum: fd26723f8d7edacdb29e3f03465c3b03 (MD5) license_text: 20626 bytes, checksum: 7851d446050a985bd0603b7c4cee472d (MD5) license_rdf: 19710 bytes, checksum: aa65da15f424ff71c620a992a187295c (MD5) license.txt: 2110 bytes, checksum: b4c884761e4c6c296ab2179d378436d4 (MD5) Previous issue date: 2010 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes) / O sucesso da propaga??o vegetativa depende do estado nutricional da planta-matriz. Entretanto, padr?es ideais das concentra??es dos nutrientes n?o est?o ainda bem estabelecidos para a miniestaquia. Assim, o objetivo deste trabalho foi avaliar a influ?ncia da aduba??o NPK na produ??o de miniestacas de eucalipto em solu??o nutritiva. O trabalho foi realizado de novembro de 2008 a janeiro de 2009, em casa de vegeta??o. Foi utilizado delineamento inteiramente casualizado em esquema fatorial fracionado (4x4x4)?, perfazendo 32 tratamentos com tr?s repeti??es. Os tratamentos se constitu?ram de quatro doses dos nutrientes de N (50; 100; 200 e 400 mg L-1) na forma de ur?ia, P (7,5; 15; 30 e 60 mg L-1) na forma de ?cido fosf?rico e K (50; 100; 200 e 400 mg L-1) na forma de cloreto de pot?ssio em solu??o nutritiva. Houve apenas efeito significativo para as doses de N isoladamente. Observou-se efeito linear decrescente com o aumento das doses de N para as vari?veis como n?mero de miniestacas, massa seca das miniestacas, massa seca da raiz e parte a?rea da minicepa de eucalipto. O n?mero de miniestacas e os teores de nutrientes foliares das miniestacas se apresentaram adequados ? literatura existente. A distribui??o percentual da massa seca e dos nutrientes variou em fun??o do aumento das doses de N. O maior ac?mulo percentual de nutrientes e de massa seca ocorreu na parte a?rea das minicepas e nas miniestacas. A dose recomendada para o material gen?tico em estudo foi de 50, 7,5 e 50 mg L-1 para NPK, com produtividade de 12 miniestacas por minicepas num per?odo de 30 dias de coleta, com ac?mulo de nutrientes na miniestaca de 6,0 cm de eucalipto de: 86% do N, 56% do P, 42% do K, 42% do Ca, 36% do Mg, 84% do S, 26% do B, 04% do Cu, 15% do Fe, 23% do Mn e 12% do Zn. / Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2010. / ABSTRACT The success of vegetative spread depends on the nutritional state of the matrix plant. However, ideal standards of nutrients concentration are not well established for the minicutting yet. So, the objective of this work was to evaluate the influence of NPK fertilizer in the production of minicuttings in a simple hybrid of Eucalyptus urophylla in?nutrient solution. The experiment was realized from November, 2008 to January, 2009 in vegetation ambient. The experimental design was a completely randomized in fractional factorial scheme (4x4x4)1/2 totaling 32 treatments with three replicates. The treatments consisted by four nutrient doses of N (50, 100, 200 and 400 mg L-1) in the urea form, P (7.5, 15, 30 and 60 mg L-1) in the phosphoric acid form and K (50, 100, 200 and 400 mg L-1) in the potassium chloride form, in the nutrient solution. There was a significant effect only for the isolated N doses for the minicuttings. It was observed that the effect with the number and dry mass of minicuttings and dry mass of root and shoots of ministumps of eucalypt decreased linearly with increasing doses of N. The number of minicuttings and the content of the leaf nutrients in minicuttings were appropriate according to the literature. The percentage distribution of dry mass and nutrients varied in function of the N doses increase. The highest percentage accumulation of nutrients and of dry mass occurred in ministumps and miniccutings shoots, except for Cu and Fe. The recommended dose to the genetic material was respectively about 50, 7,5 e 50 mg L-1 for NPK, with productivity of 12 miniccutings per ministumps in a period of 30 days of collecting and with nutrient accumulation in the ministumps about 6,0cm of eucalypt in the following values: 86% of N, 56% of P, 42% of K, 42 of Ca, 36% of Mg, 84% of S, 26% of B, 04% of Cu, 15% of Fe, 23% of Mn, and 12% of Zn.