Mosquits tigre i xinxes. L'arribada de noves plagues i el ressorgiment de les eradicades

Segons l"OMS, una plaga és una població d"un ésser viu que, quan supera una determinada densitat, provoca perjudicis en les persones. A Catalunya hi ha dos insectes especialment actius a l"estiu la població dels quals es troba molt a prop d"aquest llindar: el mosquit tigre i les xinxes.

Nous conceptes en cosmètica. La importància de la innovació i dels congressos.

El 2010 la cosmètica va generar un volum de negoci de 5.200 milions a Espanya.

Genètica amb nom propi. Mor un dels grans genetistes de l'Estat, Antoni Prevosti

L'1 de setembre va morir a Barcelona el primer catedràtic de genètica de l'estat, el professor Antoni Prevosti i Pelegrín.

L'evolució no és una teoria. La diferència entre els fets, les teories i les hipòtesis.

L'Univers cultural humà és extremamwnt complex i inclou des de creences dogmàtiques fins a explicacions científiques, que coexisteixen en la societat i fins i tot en la ment de l'individu.

La ciència que desconeixem. Malgrat la destacada recerca cientifica catalana, la societat desconeix que s'investiga

Som grans consumidors de ciència, present en totes les nostres activitats diaries. Tanmateix, ¿sabem o ens interessa saber per a que serveix allò en què s'està investigant?

L'estímul del talent per progressar. El programa Noustalents.cat s'ha de convertir en un planter de joves científics

Divendres passat, el president Montilla, amb els consellers Maragall i Huget, va presentar el programa Noustalents.cat, un projecte gestionar per Talència -Institució per Foment de la Recerca Catalana i la Viència- que té per objectiu la promoció del talent en ciències naturals i socials, tecnologia i matemàtiques.

L'increment del turisme mèdic. Cada cop més persones recorren a la sanitat d'altres països per tractar-se

Una de les indústries que ha augmentat més espectacularment el seu desenvolupament ha estat la mèdico-farmaceutica gràcies als descobriments científics i a l'aplicació de nous tractaments.

Ciència i conflictes. La recuperació econònomica passa pel desenvolupament científic i tecnològic

La falta de recursos genera competència, que a la vegada és font de conflictes. La lluita entre científics deriva en sabotatges, treballs fraudulents i manipulació de dades.

Tuotannollisen testerin suunnittelu tiedonsiirtolinkkikortille

Työssä suunniteltiin ja toteutettiin linkkikorttien tuotannollinen testeri. Linkkikortti on osa CERN:iin rakennettavan hiukkaskiihdyttimen Large Hadron Colliderin koeasema Compact Muon Solenoidin luentajärjestelmää. Linkkikortin tehtävänä on muuttaa rinnakkaismuotoinen LVDS-signaali sarjamuotoiseksi optiseksi signaaliksi. Testattaessa testeri ja linkkikortti sijoitetaan kehikkoon, joten testerin liittimien pitää olla linkkikortin liittimien kanssa identtisiä. Testerin lähdöt ovat linkkikortin tuloja ja toisinpäin. Tällöin testattaessa voidaan ohjelmoitavien FPGA-piirien avulla lähettää signaalia kortilta toiselle. Vastaanottavan kortin FPGA-piirin avulla voidaan tarkistaa, onko data tullut perille muuttumattomana. Testin ohjaus tapahtuu tietokoneella, jolla käyttäjä antaa käskyn testin aloittamisesta ja jonne lopulta myös raportoidaan testin tulokset. Testien tulokset näytetään myös testerin ledeillä. Työssä ei pystytä linkkikorttien puuttumisen takia testaamaan testeriä loppukäytössään. Kuitenkin testerin toimivuus pystyttiin suurilta osin testaamaan, jolloin saatiin odotettuja tuloksia.

Tindrà utilitat el genoma humà? Fa poc s'han complert deu anys de l'anunci de l'esborrany del genoma

Durant aquell anunci, l'aleshores president dels Estats Units, Bill Clinton, va dir que 'revolucionaria el diagnostic, la prevenció i el tractament de la major part de malalties'.

Six Sigman soveltamisedellytysten ja -apuvälineiden luominen

Diplomityön tavoitteena oli luoda soveltamisedellytyksiä ja -apuvälineitä Six Sigma -parannusprojektien läpiviennille Perlos Oyj Connectorsin meistoprosessissa. Työn teoriaosassa käsitellään Six Sigman perusteoriaa, organisointia ja soveltamista sekä suorituskykymittariston ja tiedonkeruumenetelmien luomista. Kirjallisuuden tarjoaman teorian jälkeen työssä tutustuttiin meistoprosessiin ja Perloksen tapaan soveltaa Six Sigmaa prosessien parantamiseen. Tämän perusteella kehitettiin tiedonkeruu-, dokumentointi- ynnä muita apuvälineitä parantamisprojektien tueksi. Lopuksi koekäytettiin luotuja välineitä meistoon tehdyn osittaisen Six Sigma -projektin yhteydessä. Luotettavan tiedon saaminen prosesseista on perusedellytys Six Sigma -projektien läpiviennille. Menetelmän kouluttaminen työntekijöille on myös tärkeää. Erilaiset dokumentointi- ja laskentakaavakkeet toimivat projektien läpiviennin ja seurannan tukena. Työssä luotuja tiedonkeruu-, koulutus-, dokumentointi- ynnä muita apuvälineitä voidaan käyttää jatkossa apuna Perloksella tehtävissä Six Sigma -projekteissa. Mittaristoa ja tiedonkeruuta tulee kehittää edelleen, jotta prosessien toimintaa voidaan analysoida tehokkaasti. Työn lopussa on ajatuksia Six Sigman käytöstä sekä tiedonkeruujärjestelmien jatkokehityksestä.

Selectivitat renovada. Les proves d'accés a la universitat afavoreixen la igualtat d'oportunitats

Milers d'estudiants estan pendents de les proves d'accés a la universitat, la famosa selectivitat, per accedir als estudis desitjats. Unes proves d'estructura i continguts renovats, però amb temes per resoldre.

Sistema limpo em linha para extração em fase sólida de contaminantes emergentes em águas naturais

A solid-phase in-line extraction system for water samples containing low levels of emerging contaminants is described. The system was specially developed for large volume samples (up to 4 L) using commercial solid-phase extraction (SPE) cartridges. Four sets containing PTFE-made connectors, brass adapters and ball valves were used to fit SPE cartridges and sample bottles to a 4-port manifold attached to a 20 L carboy. A lab-made vacuum device was connected to the manifold cap. The apparatus is robust and less expensive than the typical available system. Its also provides less experimental handling, avoiding cross contamination and sample losses.

D’abord, ensuite, enfin et 0, De plus: Organisation textuelle par des séries linéaires dans les articles de recherche

The study examines the signalling of text organisation in research articles (RA) in French. The work concentrates on a particular type of organisation provided by text sequences, i.e. structures organising text to items of which at least some are signalled by markers of addition or order: First… 0… The third point… In addition… / Premièrement… 0… Le troisième point… De plus… By indicating the way the text is organised, these structures guide the reader in the reading process so that he doesn’t need to interpret the text structure himself. The aim of the work is to study factors affecting the marking of text sequences. Why is their structure sometimes signalled explicitly by markers such as secondly, whereas in other places such markers are not used? The corpus is manually XML-annotated and consists of 90 RAs (~800 000 words) in French from the fields of linguistics, education and history. The analysis highlights several factors affecting the marking of text sequences. First, exact markers (such as fist ) seem to be more frequent in sequences where all the items are explicitly signalled by a marker, whereas additive markers (such as moreover) are used in sequences with both explicitly signalled and unmarked items. The marking of explicitly signalled sequences seems thus to be precise and even repetitive, whereas the signalling of sequences with unmarked items is altogether more vague. Second, the marking of text sequences seems to depend on the length of the text. The longer the text segment, the more vague the marking. Additive markers and unmarked items are more frequent in longer sequences possibly covering several pages, whereas shorter sequences are often signalled explicitly by exact markers. Also the marker types vary according to the sequence length. Anaphoric expressions, such as first, are fairly close to their referents and are used in short sequences, connectors, such as secondly, are frequently used in sequences of intermediate length, whereas the longest sequences are often signalled by constructions composed of an ordinal and a noun acting as a subject of the sentence: The first item is… Finally, the marking of text organisation depends also on the discipline the RA belongs to. In linguistics, the marking is fairly frequent and precise; exact markers such as second are the most used, and structures with unmarked items are less common. Similarly, the marking is fairly frequent in education. In this field, however, it is also less precise than in linguistics, with frequent unmarked items and additive markers. History, on the other hand, is characterised by less frequent marking. In addition, when used, the marking in this field is also less precise and less explicit.

Bus bar aeolian vibration field tests

Large amplitude bus bar aeolian vibration may lead to post insulator damage. Different damping applications are used to decrease the risk of large amplitude aeolian vibration. In this paper the post insulator load caused by the bus bar aeolian vibration and the effect of damping methods are evaluated. The effects of three types of bus bar connectors and three types of primary structures are studied. Two actual damping devices, damping cable and their combinations are studied. The post insulator loads are studied with strain gage based custom made force sensors installed on the both ends of the post insulator and with the displacement sensor installed on the midpoint of the bus bar. The post insulator loads are calculated from the strain values and the damping properties are determined from the displacement history. The bus bar is deflected with a hanging weight. The weight is released and the bus bar is left to free damped vibration. Both actual bus bar vibration dampers RIBE and SBI were very effective against the aeolian vibration. Combining vibration damper with damping cable will increase the damping ratio but it may be unnecessary considering the extra effort. Bus bar connector type or primary structure have no effect on the vertical load. The bending moment at the post insulator with double sided bus bar connector is significantly higher than at the post insulator with single sided bus bar connector. No reliable conclusions about bus bar connector type effect can be done, but the roller bearing type or central bearing type connector may reduce the bending moment. The RHS steel frame as primary structure may increase the bending moment peak values since it is the least rigid primary structure type and it may start to vibrate as a response to the awakening force of the vibrating bus bar.