The thesis is devoted to determining the parameters of the bucket to increase productivity of dredgers while mining deep-water organic-mineral sediments. It was achieved by increasing the fill factor through determining the rational geometrical parameters of the bucket. Analytical dependencies of the rational height and length of the bucket on the cutting parameters and physical-and-mechanical properties of the excavated sediments were determined. Expressions for defining forces while digging plasticity water-saturated soils were developed. Experimental investigations of the process of digging deep-water organic-mineral sediments in laboratory conditions and in the real conditions of operating single-bucket dredger in the Black Sea at the depth of 1885 m were carried out. The technique for calculation of the bucket\'s parameters was developed.

Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2018-03-27T19:26:57Z No. of bitstreams: 1 2015 - Leonardo Silva Moraes.pdf: 2362126 bytes, checksum: fe3a757125e189aee8c0a980e864ea84 (MD5) / Made available in DSpace on 2018-03-27T19:26:57Z (GMT). No. of bitstreams: 1 2015 - Leonardo Silva Moraes.pdf: 2362126 bytes, checksum: fe3a757125e189aee8c0a980e864ea84 (MD5) Previous issue date: 2016-05-06 / The aim of this study is to conduct a study of the use of Virtual Learning Environment - AVA (Moodle and Mconf) training of agricultural extension workers. The object of study were students from dairy milk cattle breeding program with technique that are students of IFES - Campus Santa Teresa. The study is divided into three parts, the first is the lifting of the student profile that is inserted into the program and the identification of their knowledge about the technologies for the distance learning, then based on this survey was drawn methodologies based on bibliographic references and offered by the teacher Ismail Haddade a virtual learning environment to students, to finalize the study was conducted questionnaires with open and closed questions in order to measure the AVA's contribution to the construction of student knowledge. It was found in these analyzes that 85% of students said that AVA has contributed significantly to improve their studies. It was also found that 84% of students indicated that the use of AVA increased their interest in the study. We found that, among the main advantages in the use of AVA 30% cited the ease of access, 26% diversity of resources, 26% mobility in various devices and 18% significant improvement in learning. The main conclusion of this study indicates that the use of AVA provides the student with a variety of resources, new types of activities, ease of access information relevant to their subject of study which favors the construction of knowledge in a collaborative and meaningful way. / O objetivo desse trabalho ? realizar um estudo do uso do Ambiente Virtual de Aprendizagem - AVA (Moodle e Mconf) no treinamento de extensionistas agr?colas. O objeto de estudo foram alunos do programa de pecu?ria leiteira leite com t?cnica que s?o alunos do IFES ? Campus Santa Teresa. O estudo ? dividido em tr?s partes, a primeira ? o levantamento do perfil do aluno que est? inserido dentro do programa e os identifica??o dos seus conhecimentos a respeito das tecnologias voltadas para o EAD, posteriormente com base nesse levantamento foi tra?ado metodologias baseadas em referencial bibliogr?fico e ofertado junto ao professor Ismail Haddade um ambiente virtual de aprendizagem aos alunos, para finalizar o estudo foi realizado question?rios com perguntas abertas e fechadas com o intuito de mensurar a contribui??o do AVA para a constru??o do conhecimento dos alunos. Foi verificado nessas an?lises que 85% dos alunos afirmaram que o AVA contribuiu significamente para melhora dos seus estudos. Tamb?m foi constatado que 84% dos alunos indicaram que o uso do AVA aumentou o interesse deles pelo estudo. Verificamos que, dentre as principais vantagens no uso do AVA 30% citaram a facilidade de acesso, 26% a diversidade de recursos, 26% a mobilidade em diversos dispositivos e 18% a melhora significativa de aprendizagem. A principal conclus?o desse estudo aponta que o uso do AVA propicia ao aluno uma diversidade de recursos, novas tipos de atividades, facilidade de acesso as informa??es pertinentes ao objeto de estudo deles o que favorece a constru??o do conhecimento de forma colaborativa e significativa.

<p>Traffic planning in a modern congested society is an important and time consuming procedure. Finding fast algorithms for solving traffic problems is therefore of great interest for traffic planners allover the world. </p><p>This thesis concerns solving the fixed demand traffic assignment problem (TAP) on a number of different transportation test networks. TAP is solved using the Frank-Wolfe algorithm and the shortest path problems that arise as subproblems to the Frank-Wolfe algorithm are solved using the network simplex algorithm. We evaluate how a number of existing pricing strategies to the network simplex algorithm performs with TAP. We also construct a new efficient pricing strategy, the Bucket Pricing Strategy, inspired by the heap implementation of Dijkstra's method for shortest path problems. This pricing strategy is, together with the actual use of the network simplex algorithm, the main result of the thesis and the pricing strategy is designed to take advantage of the special structure of TAP. In addition to performing tests on the conventional Frank-Wolfe algorithm, we also test how the different pricing strategies perform on Frank-Wolfe algorithms using conjugate and bi-conjugate search directions. </p><p>These test results show that the updating shortest path calculations obtained by using the network simplex outperforms the non-updating Frank-Wolfe algorithms. Comparisons with Bar-Gera's OBA show that our implementation, especially together with the bucket pricing strategy, also outperforms this algorithm for relative gaps down to 10E-6.</p>

Traffic planning in a modern congested society is an important and time consuming procedure. Finding fast algorithms for solving traffic problems is therefore of great interest for traffic planners allover the world. This thesis concerns solving the fixed demand traffic assignment problem (TAP) on a number of different transportation test networks. TAP is solved using the Frank-Wolfe algorithm and the shortest path problems that arise as subproblems to the Frank-Wolfe algorithm are solved using the network simplex algorithm. We evaluate how a number of existing pricing strategies to the network simplex algorithm performs with TAP. We also construct a new efficient pricing strategy, the Bucket Pricing Strategy, inspired by the heap implementation of Dijkstra's method for shortest path problems. This pricing strategy is, together with the actual use of the network simplex algorithm, the main result of the thesis and the pricing strategy is designed to take advantage of the special structure of TAP. In addition to performing tests on the conventional Frank-Wolfe algorithm, we also test how the different pricing strategies perform on Frank-Wolfe algorithms using conjugate and bi-conjugate search directions. These test results show that the updating shortest path calculations obtained by using the network simplex outperforms the non-updating Frank-Wolfe algorithms. Comparisons with Bar-Gera's OBA show that our implementation, especially together with the bucket pricing strategy, also outperforms this algorithm for relative gaps down to 10E-6.

Ocean uptake of anthropogenic CO2 causes ocean acidification, a secular, global-scale decline in the pH of seawater. In order to better understand the implications of contemporary acidification for marine organisms and ecosystems, there is a need to better characterise natural variability in carbonate chemistry. In this thesis, climatological seasonal variability of sea surface pH and aragonite saturation state (OmegaA) in the open ocean is indirectly derived from other parameters of the marine CO2 system, namely total alkalinity (TA) and seawater pCO2/fCO2 (pCO2sw/fCO2sw). New monthly sea surface TA, fCO2sw and temperature climatologies are developed for this purpose, utilising newly-released observational synthesis products (PACIFICA for TA and SOCAT v2 for fCO2sw). Two versions of the new SST climatology are developed, referred to as upper and lower SST (USST and LSST), to test sensitivity to the depth range of the input observations. Annual ranges are generally found to be larger for the USST climatology, derived using observations from the upper 2 m, compared to LSST (which is based on deeper observations). Further, a seasonal cycle is found in the monthly average of the differences between these climatologies north of 30 degN, perhaps partly due to seasonal variation in near-surface stratification. The USST seasonal ranges are also found to be generally larger than in two previous SST climatologies, however, difference in the depth distribution of the input measurements is unlikely the main cause. The new monthly sea surface TA climatology extends coverage into the Nordic seas, excluded from previous climatologies. TA seasonality is found to be small outside of regions with large seasonal ranges in salinity. Large seasonal ranges in salinity and TA are found beneath the Intertropical Convergence Zone, in the Antarctic seasonal sea ice zone and in the western Greenland Sea. Non-salinity driven TA seasonality is found to be large in the Gulf of Alaska, eastern equatorial Pacific and western Greenland Sea. Compared to the Lee et al. (2006) TA climatology, substantially lower annual means and seasonal ranges are found for the subarctic Pacific, a region with greatly improved coverage courtesy of PACIFICA. The pH/OmegaA climatologies derived in the final chapter suggest pH seasonality is predominantly temperature driven in the subtropics and mainly driven by variation in salinity normalised dissolved inorganic carbon (sDIC) in the subpolar north Atlantic, western subarctic Pacific and Southern Ocean. Salinity variation is found to only exert a strong influence on pH seasonality in the western Greenland Sea. Climatological seasonal pH ranges are found to be mostly small in the tropics (<0.05), moderate in the subtropics (0.05-0.10) but very large (>0.1) in parts of the Ross, Weddell, Irminger and Iceland Seas and western subarctic Pacific gyre. OmegaA seasonality is found to be predominantly sDIC-driven everywhere except in the western Greenland Sea, with temperature variation generally being of modest influence. Seasonal cycles of pH and OmegaA are found to be in anti-phase where pH is mainly thermally driven and in-phase where pH is mainly sDIC-forced (both pH and OmegaA vary inversely with DIC). Comparison is made between the primary new pH/OmegaA climatology and various open ocean carbonate chemistry time-series. The climatology captures the general form of the climatological seasonal cycles of pH and OmegaA from the time-series, although with some differences in phasing and seasonal range. Analysing the time-series for long-term trends, I find that inter-decadal anthropogenic CO2 uptake driven pH and OmegaA declines can be modulated by trends in temperature, salinity or sTA. Investigation is also conducted into how the amplitude of pH and OmegaA seasonal cycles might change by 2100 for a subpolar and subtropical time-series. Under a high CO2 emissions scenario, the seasonal range of pH is found to be strongly enhanced for the subpolar time-series and moderately reduced for the subtropical time-series, with both being due to changes in seawater buffer capacity. / Graduate / 0425 / 0415 / robdj87@hotmail.com

The document describes a manipulator for a wheel excavator. The purpose of the manipulator is to handle with the propulsive shaft of a crushing machine and the tension cylinder of an interchanging conveyor-belt during the assembling and maintenance. The objective of the master's thesis is the strength analysis of the manipulator components and the telescopic arm with using the finite element method. The thesis also comprises the assembly drawing of the manipulator with additional devices and the propulsion system calculation. The project is carried out with the cooperation of NOEN a.s.

This diploma thesis deals with design of the high loading shovel for the loader Komatsu WA380. The aim is to find constructional solutions of the high loading shovel for a minimal dumping height of 4 500 mm, for the bucket width of 3 000 mm and for the bucket volume of 5 m3. The thesis contains a brief description of the high loading shovel and description of basic constructional components. It also contains choices of basic constructional components, a calculation of the necessary force to tilt the bucket and a static analysis. Stress control of the bucket, the frame and the pegs forms the final part of the thesis. The thesis is accompanied by the necessary technical drawings.

The increasing number of delay and loss critical services in packet networks require differentiated packet handling in the forwarding plane. Quality of Service (QoS) guarantees can be given for networks using resource reservation and admission control. However, such strategies require complex control plane extensions and might lead to higher operation expenditures. Network operators therefore often use over-provisioning and traffic differentiation to offer cheaper Class of Service (CoS) quality in their internet protocol (IP) packet networks. The number of differentiated classes and their autonomous system (AS) internal implementation is at the operator’s choice. This paper proposes a signalling concept for inter-AS layer three Class Set signalling, supported classes, their encoding and packet rate limitations. It makes use of the Border Gateway Protocol (BGP) as the predominantly used routing protocol for AS peering communication. The paper specifies two new nontransitive attributes, which enable adjacent peers to signal Class of Service capabilities and admission control limitations. The new "CoS Capability Attribute" and the “CoS Parameter Attribute" are simple data structures, which signal the classes, their per hop behaviour (PHB) ID code and the token bucket control performed at the ingress AS border router for rate limitation purposes. The denoted Class of Service forwarding support is meant as the AS externally available (transit) Class of Service support. The approach is now work in progress at the IETF.

Sammanfattning: Det mest märkbara resultatet i studien är att det inte krävs en stor aktör med många följare för att påbörja en stor kampanj, men det är nödvändigt att få hjälp av dem för att nå en viral spridning. De två studerade kampanjerna hade helt olika sätt att kommunicera på, där MeToo hade en allvarsam ton och Ice Bucket Challenge ett humoristiskt och positivt laddat budskap - båda om smärtsamma ämnen. Eftersom de båda blev virala visar resultatet att det viktigaste är ett känslomässigt laddat budskap som påverkar folk, oavsett om det är glada, ilskna eller sorgsna känslor. Det krävs stark känslomässig påverkan för att personer ska känna sig motiverade att sprida vidare ett budskap. Samhällsklimatet och aktuella samhällsfrågor kan hjälpa en kampanj bli viral, men är inte nödvändig. Det finns ingen specifik riktlinje eller mall att följa för att bli viral, men det är viktigt att ha hög spridbarhet på sitt budskap och motivera mottagaren att dela vidare.

Detta examensarbete handlar om en skopkonstruktions utveckling, avsedd för en serieskopor men konstruktionen har enbart implementerats på en kabelskopa. Arbetet har utförtspå uppdrag av ett verkstadsföretag som utvecklar, tillverkar och säljer entreprenadutrustningtill grävmaskiner och hjullastare. Företagets vision är att komma ut på den svenskalågprismarknaden, men i dagsläget är produktionskostnaderna på skoporna för höga. Måletmed arbetet har varit att ta fram en konstruktionslösning som sänker företagets produktionskostnader.Efter ett möte med företaget tydliggjordes vilka behov som efterfrågades och dessa behovtolkades i form av kundkrav. Med en QFD-analys översattes kundkraven till produktegenskapersom krävs för en lyckad skopkonstruktion. Fokus har främst lagts på att förenklaskopans montering och anpassa dess konstruktion för robotsvetsning. Några faktorer harvarit att utforma självfixerande detaljer och beakta åtkomlighet för svetsning. Konceptengenererades genom intern och extern sökning, där metoder så som brainstorming och konkurrentanalyshar använts.Konceptvalet utfördes med Pughs beslutsmatris, där ett relativt optimalt koncept valdes förfortsatt utveckling. Vid utvecklingen har diverse verifieringsmetoder använts, som till exempelriskanalys, finita elementmetoden (FEM) och kostnadskalkyl för att kontrollera attdet valda konceptet uppfyller de uppsatta kraven för skopan. I verifieringsfasen identifieradesflera förbättringsmöjligheter som implementerades på det valda konceptet och dettagav ett bättre koncept än tidigare.Det slutliga konceptet har fått en sänkt produktionskostnad, med effektivare montering,minskad materialanvändning och svetsning samt en bättre prestanda än tidigare. / This thesis is about the development of a bucket design; intended for a range of excavatorbuckets consisting of four different types, but has only been implemented on the cablebucket. The work has been performed on behalf of a company that develops, produces andsells construction equipment for excavators and wheel loaders. At the present, the company'sexcavator buckets have high production costs, but the vision is to get into the low-costmarket. The goal of this work has been to develop a bucket design that reduces the company'sproduction costs.After a meeting with the company it became clear what needed to be achieved. The collectedneeds were interpreted in terms of customer requirements. A QFD was made, and thecustomer requirements were translated into product specifications for a successful bucketdesign. Particular focus has been put on simplifying the assembly of the bucket and adaptingits design for robot welding. Some essential factors have been to design interactingparts and to consider the accessibility for welding. The concepts were generated throughinternal and external searches, where methods as brainstorming and competitor analysiswere used.Concept selection was made by using Pugh's decision-matrix. A relatively optimal conceptwas selected for further development. During the development, various verification methodswere used, as for example risk analysis, finite element analysis (FEA) and cost estimate,to verify that the selected concept meets the set requirements for the excavator bucket.Several potential improvements were identified during the verifications phase and theseimprovements were implemented on the selected concept, which resulted in an even betterconcept than before.The final concept obtained a reduced production cost, with a more efficient assembly, reducedmaterial use and welding as well as a better performance than before.