65 research outputs found
Commissioning of the ALICE PHOS Detector and Integration into the ALICE High Level Trigger
No full textPartikkelakseleratoren Large Hadron Collider (LHC) ved CERN utenfor Geneve vil kollider protoner og tunge ioner med en hastighet opp mot lyshastigheten.
I disse kollisjoene vil det dannes en ny form for materie. Denne materien er kallt "quark gluon plasma" og man tror at forståelsen av egenskapene til dette plasmaet er nøkkelen til å forstå oprinnelsen til materie i Universet.
ALICE er ett av fire experimenter ved LHC og består av ca 15 subdetectorer. ALICE er det eneste experimented dedikert til studier av kollisjoner av tunge ioner. Ved tung-ione kollisjoner ved LHC vil en oppnå energi tettheter som tilsvarer energitettheten like etter universets begynnelse (Big Bang).
Fotoner er interessante observable. Siden de vekselvirker lite med quark gluon plasma vil fotoner dannet i plasmaet propagere uforstyrret til en av sub-detectorene, the PHoton Spectrometeret (PHOS), hvor de måles med stor nøyaktighet. Fotoner dannet i quark gluon plasmaet vil såleds danne ett slags røngten fotografi av plasmaet
Commissioning of the ALICE PHOS Detector and Integration into the ALICE High Level Trigger
No full textTomato protoplast DNA transformation: physical linkage and recombination of exogenous DNA sequences
Get PDFTomato protoplasts have been transformed with plasmid DNA's, containing a chimeric kanamycin resistance gene and putative tomato origins of replication. A calcium phosphate-DNA mediated transformation procedure was employed in combination with either polyethylene glycol or polyvinyl alcohol. There were no indications that the tomato DNA inserts conferred autonomous replication on the plasmids. Instead, Southern blot hybridization analysis of seven kanamycin resistant calli revealed the presence of at least one kanamycin resistance locus per transformant integrated in the tomato nuclear DNA. Generally one to three truncated plasmid copies were found integrated into the tomato nuclear DNA, often physically linked to each other. For one transformant we have been able to use the bacterial ampicillin resistance marker of the vector plasmid pUC9 to 'rescue' a recombinant plasmid from the tomato genome. Analysis of the foreign sequences included in the rescued plasmid showed that integration had occurred in a non-repetitive DNA region. Calf-thymus DNA, used as a carrier in transformation procedure, was found to be covalently linked to plasmid DNA sequences in the genomic DNA of one transformant. A model is presented describing the fate of exogenously added DNA during the transformation of a plant cell. The results are discussed in reference to the possibility of isolating DNA sequences responsible for autonomous replication in tomato.
Tomato: a crop species amenable to improvement by cellular and molecular methods
Get PDFTomato is a crop plant with a relatively small DNA content per haploid genome and a well developed genetics. Plant regeneration from explants and protoplasts is feasable which led to the development of efficient transformation procedures.
In view of the current data, the isolation of useful mutants at the cellular level probably will be of limited value in the genetic improvement of tomato. Protoplast fusion may lead to novel combinations of organelle and nuclear DNA (cybrids), whereas this technique also provides a means of introducing genetic information from alien species into tomato. Important developments have come from molecular approaches. Following the construction of an RFLP map, these RFLP markers can be used in tomato to tag quantitative traits bred in from related species. Both RFLP's and transposons are in the process of being used to clone desired genes for which no gene products are known. Cloned genes can be introduced and potentially improve specific properties of tomato especially those controlled by single genes. Recent results suggest that, in principle, phenotypic mutants can be created for cloned and characterized genes and will prove their value in further improving the cultivated tomato.
Development of a position regulation for an automatised trolleybus collector system using pneumatic cylinders
No full textAn Trolleybussen ist das außen sichtbare Hauptmerkmal das Stangenstromabnehmersystem. Dieses hat neben seinen Vorteilen, wie z. B. die dauerhafte Versorgung der Elektromotoren der Busse, auch einen Nachteil: Um die Stromabnehmer an die Leitung anzulegen (andrahten), muss der Fahrer aussteigen und per Hand die Stromabnehmerköpfe an die Leitung führen. Zwar gibt es mittlerweile Konstruktionen im Serieneinsatz, die das Andrahten erleichtern, jedoch sind diese Konstruktionen nur an bestimmten Stellen der Oberleitung vorhanden. Um an einer beliebigen Stelle an der Oberleitung die Stromabnehmerköpfe automatisch anzudrahten, bedarf es Sensoren und Aktuatoren und, um eine gezielte Bewegung ausführen zu können, Steuerungs- und Regelungssystemen. In dieser Diplomarbeit wird das vorhandene System (Vossloh Kiepe, TypThe most distinguishing feature of the trolley buses are the collector systems. Beside their advantages, such as the permanent power supply of the electric motors, this system has one major disadvantage: In order to attach the collector system to the overhead wires the bus driver has to get off the bus and manually pull the collector system towards the overhead wires. Even though constructions facilitating the process of wiring are commonly installed, these devices only exist at certain parts of the overhead wires. To wire at any given position sensors and actuators, as well as control and regulation systems, are needed to execute a targeted movement. This thesis aims to analyze the existent collector system (Vossloh Kiepe, typ
Basaltfiber som alternativ til slakkarmering i vegger. Et studium av; praktiske, økonomiske og miljømessige konsekvenser.
No full textByggebransjen forholder seg i stor grad til kjente materialer og metoder som følger Eurokodene. Nye løsninger krever at aktører innen næringen er villig til å prøve alternative metoder som potensielt kan effektivisere byggeprosessen og forbedre resultatet.
Denne bacheloroppgaven tar for seg basaltfiber som alternativ, eller som supplement, til tradisjonell slakkarmering i primært trykkpåkjente innervegger. Oppgaven tar utgangspunkt i leilighetskomplekset Moy Terrasse i Grimstad hvor det ble gjennomført ett praktisk forsøk med basaltfiber. Forsøket la grunnlaget for denne rapporten og gikk ut på å støpe to geometrisk identiske vegger med forskjellige armeringsløsning.
Basaltfiber er et organisk materiale som har gode egenskaper til å motstå riss i betongen. Unikt for denne type fiber er at den har samme tetthet som betong. Dette gjør at den hverken synker eller flyter opp ved utstøping. Basaltfibertypen som ble benyttet i forsøket heter MiniBars™ og er produsert av ReforceTech.
For å sammenligne basaltfiber med tradisjonell slakkarmering er det fokusert på tre faktorer som drøftes for å komme til en konklusjon. Disse faktorene er henholdsvis praktisk utførelse, økonomi og miljø. Erfaringer fra førstnevnte er at selve støpen var tilsvarende arbeid, men det var noe enklere å sette opp forskaling til basaltveggen da det kun var en liten mengde slakkarmering.
Den økonomiske delen er delt inn i materialkostnader og arbeidskostnader. Til tross for at basaltfiber har en dyrere kilopris enn stangarmering, veies det opp for ved at det kreves mye mindre mengde fiber per kubikk betong enn det gjør med slakkarmering. Differansen i materialkostnadene er derfor relativt liten. Besparingene ved bruk av basaltfiber kommer i all hovedsak fra de lave arbeidskostnadene i tillegg til redusert byggetid.
Byggebransjen står for en vesentlig del av klimagassutslippene i verden. Tiltak som kan gjøres er å utforske materialer og metoder som er mer miljøvennlige. Basaltfiber er et alternativ til slakkarmering som viser seg å være betydelig mer miljøvennlig, forbeholdt at det bare er materialene som sammenlignes. Selv om basaltfiber har lavere utslipp enn slakkarmering, blir differansen mellom armeringene tilnærmet neglisjerbar i forhold til utslippene fra betong.
Det viser seg at en kombinasjonsløsning av slakkarmering og basaltfiber vil ha lavere kostnad og føre til noe mindre CO2-utslipp, uten å påvirke veggens utseende og struktur. I tillegg er det generelt et behov for mer kunnskap om basaltfiber som armeringsmateriale i byggebransjen
An edition of the cartulary of St. Mary's Collegiate Church, Warwick.
Get PDFIn 2 volsAvailable from British Library Document Supply Centre-DSC:DXN034790 / BLDSC - British Library Document Supply CentreSIGLEGBUnited Kingdo
A study of the works of Juan De Flores, with a critical edition of La Historia de Grisel y Mirabella
No full textPhDMy thesis is intended to throw new light on the
biography of the late-fifteenth-century writer Juan de
Flores and to elucidate various aspects of his role in
the development of the Spanish sentimental romance. To
this end, I have prepared a critical edition of his
romance La hiatQri. a sie Gr i. Bel y Mirak-elle (ca. 1480) in
the three distinct versions in which it is known to have
circulated: (1) an original text (preserved in MS
5-3-20, Biblioteca Colombina, Seville, fos. 69r-86r),
(2) a revised version (preserved in MS 940, Biblioteca
Trivulziana, Milan, fos. 1r-76v), and (3) a second
revision, probably anonymous (preserved in the eight
extant printed editions, which range in date from ca.
1495 to 1562). The edition contains a full corpus of
variants for the printed witnesses, along with
linguistic, exegetical and textual notes. Accompanying
this edition is a textual study (Chapter 3) in which I
establish the relationship to one another of the
surviving witnesses and discuss in detail the work's
genesis. The remaining chapters concern the attribution
to Flores of two works hitherto regarded as anonymous.
In Chapter 1, I argue that the known as La
==na-WQn da la zel a GTaniBla is modelled on GI, 1, Bgl y
Mirabelle, and I adduce stylistic and other
circumstantial evidence to show that Flores is probably
-2-
its author. Employing a similar methodology, I
demonstrate in Chapter 2 that Flores can be identified
as a royal chronicler to the Catholic Monarchs and
author of the GjQai-Qa i. nQQIp1at de 14a Ray! aa Qat4j
-Q4a"
Drawing on information in the chronicle, I provide a
plausible reconstruction of his life at the ducal court
of Alba and illustrate the importance of his
historiographic work for our understanding of his
fictional output. This thesis provides a revaluation of
Juan de Flores as a far more prolific, versatile and
influential author than has previously been recognized
OptiThin – Implementation of precision horticulture by tree-specific mechanical thinning
No full textApples show biennial fluctuations in yields (alternate bearing). The alternate bearing cycle can be broken by reducing excessive flowers using either chemical or mechanical means. Currently, automatic thinning systems are treating the trees uniformly despite the fact that neighbouring trees can have a very different numbers of flowers resulting in different thinning requirements. In order to solve this problem the joint project OptiThin has been started. The aim of OptiThin was to develop a system that adapts thinning intensity individually to each tree by reducing the flowers efficiently and eco-friendly. In the result, OptiThin comprises a set of new technologies including: a) a stereo camera with software for real-time determination of flower density per tree; b) a shock absorbing camera platform; c) a mobile geographic information system; d) a decision support tool to calculated optimum thinning intensity based on current flower density and ancillary data (e.g. yield, soil); e) a mechanical thinning unit which is controlled in real-time. It was shown that adaptive management of excessive flowers could improve yield of marketable fruits and that environmental friendly mechanical thinning - without chemicals - is feasible
OptiThin – Implementation of Precision Horticulture by Tree-Specific Mechanical Thinning
No full textApples show biennial fluctuations in yields (alternate bearing). The alternate bearing cycle can be broken by reducing excessive flowers using either chemical or mechanical means. Currently, automatic thinning systems are treating the trees uniformly despite the fact that neighbouring trees can have a very different numbers of flowers resulting in different thinning requirements. In order to solve this problem the joint project OptiThin has been started. The aim of OptiThin was to develop a system that adapts thinning intensity individually to
each tree by reducing the flowers efficiently and eco-friendly. In the result, OptiThin comprises a set of new technologies including: a) a stereo camera with software for real-time determination of flower density per tree; b) a shock absorbing camera platform; c) a mobile geographic information system; d) a decision support tool to calculated optimum thinning intensity based on current flower density and ancillary data (e.g. yield, soil); e) a mechanical thinning unit which is controlled in real-time. It was shown that adaptive management of excessive flowers could improve yield of marketable fruits and that environmental friendly mechanical thinning – without chemicals – is feasible
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