1000 resultados para Linden, V. F.
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Digitoitu 24. 4. 2008.
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Les empreses sempre han buscat com optimitzar el mà xim els seus recursos i ser més eficients a la hora de realitzar les tasques que li han estat encomanades. És per aquest motiu que constantment les empreses realitzen estudis i valoracions de com poder millorar dia a dia. Aquest fet no és diferenciador a l’empresa Serralleria i Alumini Vilaró (S.A.V), que dia a dia estudia com optimitzar els seus processos o de vegades introduir-ne de nous per tal d’expandir la seva oferta de serveis. L’empresa és dedica a la fabricació de peces metà l•liques el procés ja sigui només de tall i mecanitzat, plegat, soldadura, acabats en inoxidable, pintura i fins i tot embalatge pel que fa a la part productiva, respecte a la part d’oficina tècnica també ofereix serveis de desenvolupament de productes segons especificacions del client i reenginyeria de qualsevol producte, analitzant la part que és vol millorar. En l’actualitat l’empresa ha detectat una mancança que creu que es podria solucionar, el problema és que l’empresa disposa de varies mà quines de tall, entre les quals hi ha una mà quina de tall là ser i el problema principal és que la cà rrega de les planxes del calaix de magatzem a la bancada de la mà quina es realitza o bé manualment o a través d’un gripper sostingut al pont grua, depenent del pes de la planxa a transportar. L’objectiu principal d’aquest treball és fer el disseny d’una mà quina que permeti automatitzar el procés de transportar la planxa metà l•lica del calaix de magatzem dipositat sobre una taula mòbil a la bancada de la mà quina de tall. El disseny que pretenem fer és complet començant per fer un disseny estructural de la mà quina més els seus respectius cà lculs, moviments que volem aconseguir, tria de components ( motors, sensors ...), elaboració d’un pressupost per poder fer una estimació i finalment la elaboració del programa de control de tota la mà quina més la interacció amb la mà quina a través d’una pantalla tà ctil. Es a dir, el que pretenem és realitzar un projecte que puguem fabricar en la realitat utilitzant tota la informació continguda dins del mateix
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Vuosi 2010 on runoilija V. A. Koskenniemen syntymän 125-vuotisjuhlavuosi. Juhlavuoden johdosta Turun yliopiston kirjasto on koonnut V. A. Koskenniemen täydennetyn ja tarkistetun bibliografian. Bibliografia julkaistaan sähköisessä muodossa Turun yliopiston verkkoarkistossa ja on käytettävissä Internetin kautta. V. A. Koskenniemen elämäntyötä koskevan tutkimuksen sujuvoittamiseksi ja hänen monipuolisen julkaisutuotantonsa tunnetuksi tekemiseksi tarvitaan tarkistettu bibliografia, joka kokoaa yhteen sekä erilaisissa lähdeteoksissa julkaistut bibliografiat että julkaisemattoman lehtileikkeiden bibliografian. Bibliografian laatimisessa aineistona on käytetty aikaisempia V. A. Koskenniemen bibliografioita, jotka ovat seuraavat:
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This thesis is devoted to investigations of three typical representatives of the II-V diluted magnetic semiconductors, Zn1-xMnxAs2, (Zn1-xMnx)3As2 and p-CdSb:Ni. When this work started the family of the II-V semiconductors was presented by only the compounds belonging to the subgroup II3-V2, as (Zn1-xMnx)3As2, whereas the rest of the materials mentioned above were not investigated at all. Pronounced low-field magnetic irreversibility, accompanied with a ferromagnetic transition, are observed in Zn1-xMnxAs2 and (Zn1-xMnx)3As2 near 300 K. These features give evidence for presence of MnAs nanosize magnetic clusters, responsible for frustrated ground magnetic state. In addition, (Zn1-xMnx)3As2 demonstrates large paramagnetic response due to considerable amount of single Mn ions and small antiferromagnetic clusters. Similar paramagnetic system existing in Zn1-xMnxAs2 is much weaker. Distinct low-field magnetic irreversibility, accompanied with a rapid saturation of the magnetization with increasing magnetic field, is observed near the room temperature in p- CdSb:Ni, as well. Such behavior is connected to the frustrated magnetic state, determined by Ni-rich magnetic Ni1-xSbx nanoclusters. Their large non-sphericity and preferable orientations are responsible for strong anisotropy of the coercivity and saturation magnetization of p- CdSb:Ni. Parameters of the Ni1-xSbx nanoclusters are estimated. Low-temperature resistivity of p-CdSb:Ni is governed by a hopping mechanism of charge transfer. The variable-range hopping conductivity, observed in zero magnetic field, demonstrates a tendency of transformation into the nearest-neighbor hopping conductivity in non-zero magnetic filed. The Hall effect in p-CdSb:Ni exhibits presence of a positive normal and a negative anomalous contributions to the Hall resistivity. The normal Hall coefficient is governed mainly by holes activated into the valence band, whereas the anomalous Hall effect, attributable to the Ni1-xSbx nanoclusters with ferromagnetically ordered internal spins, exhibits a low-temperature power-law resistivity scaling.
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Invocatio: Q.F.F.Q.S.
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The removal of As(V) by a crosslinked iron(III)-chitosan adsorbent was evaluated under various conditions. The adsorption capacity of CH-FeCL was around 54 mg/g of As(V). The kinetics of adsorption obeys a pseudo-first-order model with rate constants equal to 0.022, 0.028, and 0.033 min-1 at 15, 25 and 35 ºC respectively. Adsorption data were well described by the Langmuir model, although they could be modeled also by the Langmuir-Freundlich equation. The maximum adsorption capacity, calculated with the Langmuir model, was 127 mg g-1 of As(V). The inhibition by competing anions is dependant on their kind and valence.
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Invocatio: [hepreaa].
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S’estudia una inscripció funerà ria d’una verge consagrada anomenada Thecla d’origen egipci que va ser enterrada en una de les basÃliques funerà ries que existien en el segle v a ponent de Tarraco. Es revisa el que s’ha escrit sobre aquesta important inscripció els darrers vint anys, i s’analitzen de nou les caracterÃstiques de l’epÃgraf (paleografia, formulari, etc.). Finalment, es conclou que no hi ha relació entre aquesta Thecla i el culte implantat en època medieval a santa Tecla com a patrona de Tarragona, en contra del que han proposat alguns autors.
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Invocatio: I.N.J.
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Invocatio: D.D.
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Invocatio: [hepreaa].
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A simple liquid chromatographic method for the simultaneous determination of creatinine, hippuric acid, mandelic acid, phenylglyoxylic acid and o, m and p-methylhippuric acids was developed and validated. Sample preparation was only dilution with water (1:10), followed by centrifugation. Analysis was performed in a reversed phase column (Lichrospher RP 8ec), 250 x 4.0 mm, with isocratic elution with phosphate buffer pH 2.3 and acetonitrile (90:10, v/v). The method presents adequate linearity, precision and accuracy and allows the simultaneous determination of the biomarkers of exposure to toluene, xylene and styrene together with creatinine, reducing cost and laboratory time.
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Arkit: A-B4.
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Methyl ethyl ketone (MEK) is a solvent commonly used in chemical, paint and shoe industry. The aim of this study was to develop and validate a method for urinary quantification of MEK, employing headspace solid phase micro extraction sampling (SPME) coupled to gas chromatography with flame ionization detection (GC-FID). The calibration curve (y=4.6851x-0.0011) presented good linearity with r²=0.9993. Accuracy (94-109%), intra-assay precision (4.07-5.91%) and inter-assay precision (3.03-5.62%) were acceptable. The quantification limit was 0.19 mg/L. This low cost method can be used routinely in the biological monitoring of occupational exposure to MEK, according to the requirements of the Brazilian legislation.
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Invocatio: [hepreaa].