323,120 research outputs found
Cabella-linjan kehitysprojekti : S+5S
No full textRuukki Metalsin Naantalin teräspalvelukeskuksessa kevään ja alkukesän 2011 aikana tehdyssä Cabella-linjan kehitysprojektissa keskityttiin uudelleen kelauslinjan toiminnan kehittämiseen. Työssä hyödynnettiin Ruukin käytössä olevan laatujärjestelmän S+5S perusajatuksia, sekä tuotannon tasaamista ja -osaamista. Tarve työlle tuli siitä, kun Naantaliin saatiin lisää kelaustyötä. Aiemmin linja oli tuotantokäytössä melko vähän, vain puoli vuoroa päivässä, ja uusien tilausten myötä uudeksi tuotantokäytöksi arvioitiin kaksi vuoroa päivässä. Asiakkaat tilaavat kerralla melko isoja määriä johtuen heidän asiakaskuntansa tarpeesta ja lisäksi aika tilauksesta toimitukseen on niin lyhyt, että tuotannon helpomman hallinnan ja paremman virtauksen kannalta tuotannon tasaaminen tuli tärkeäksi. S+5S on havaittu Ruukissa hyväksi työkaluksi niin turvallisuuden lisäämiseen kuin myös työviihtyvyyden lisäämiseen. Ruukissa toteutettuja S+5S-kehitystoimia ovat kommentoineet positiivisesti niin asiakkaat, vakuutusyhtiö kuin työsuojelupiirinkin edustajat. Toimipisteiden siisteys on parantunut, työviihtyvyys parantunut; tehokkuuden uskotaan myös parantuneen näiden toimien ansiosta, mutta sitä ei ole pystytty esittämään numeroin johtuen monista muistakin kehitystoimista, joita on tehty samanaikaisesti. Kehitysprojektissa tehtiin työtä S+5S:n ja VSM:n kanssa; määriteltiin tarvittavat tavarat ja niiden paikat, raaka-aineiden ja tuotteiden virtaus tehtaalla ja yleensäkin toimintatavat. Projektin aikana alkoivat toimitukset asiakkaille ja niistä aiheutui muutoksia mm. pakkauksiin sekä linjan toimintaan. Näistä muutoksista tehtiin mm. yksi toteutettu aloite, jolla saatiin hyödynnettyä aiemmin romuksi menneitä isojen kelojen sisäreikien suojia. Kelauslinjalla pystyttiin parantamaan linjan jarruyksikön toimintaa, jolla varmistetaan kelojen tiukkuus ja näin osaltaan estetään kelojen lysähtäminen. Tarvittavien työvuorojen lisääminen vaati myös uusien työntekijöiden kouluttamisen linjan käyttöön.Ruukki development project of the Cabella line was conducted during the spring and the early summer of 2011 in the Naantali steel service centre of Metals It concentrated on the development of the operation of the coiling line. The work was utilized Ruukki`s, S+5S of the quality system in use, the basic ideas and levelling out of the production and the multi-tasking skills of the employees. The need for the work came when more reeling work was obtained to Naantali. Earlier the line was in the production use fairly little and for only half a turn per day. The new production use was estimated to be two turns per day with new orders. The customers order fairly high numbers at one time due to the need of their clientele. Moreover the time from the order to the delivery is so short that from the point of view of easier production management and better flow the levelling out of the production became important. S+5S has been found to be a good tool in Ruukki to increase safety as well as the work satisfaction. The S+5S development operations that have been carried out in Ruukki have been positively commented on by the customers, insurance company and the representatives of the industrial safety district. The tidiness of the offices and work satisfaction has improved; it also is believed that the efficiency has improved thanks to these actions. It has not been possible to demonstrate this with numbers due to many other development operations which have been conducted simultaneously. S+5S and VSM were utilized in the development project work; the necessary goods and their places, flow of raw materials and of products were defined, as well as operation practise in general. During the project deliveries to the customers began and they caused changes, among others, in packing and the operation of the line. A suggestion, among others, was executed where the protections of the inner holes of big coils were utilized as they whereas earlier they were scrap It was possible to improve the operation of the brake until of the coiling line with which the tightness of the coils is ensured and this, for its part, prevents the collapsing of coils. The addition of work shift required training of new workers into the use of the line
Primordial non-Gaussianity: local curvature method and statistical significance of constraints on f_NL from WMAP data
No full textWe test the consistency of estimates of the non-linear coupling constant fNL using non-Gaussian cosmic microwave background (CMB) maps generated by the method described in the work of Liguori, Matarrese & Moscardini. This procedure to obtain non-Gaussian maps differs significantly from the method used in previous works on the estimation of fNL. Nevertheless, using spherical wavelets, we find results in very good agreement with Mukherjee & Wang, showing that the two ways of generating primordial non-Gaussian maps give equivalent results. Moreover, we introduce a new method for estimating the non-linear coupling constant from CMB observations by using the local curvature of the temperature fluctuation field. We present both Bayesian credible regions (assuming a flat prior) and proper (frequentist) confidence intervals on fNL, and discuss the relation between the two approaches. The Bayesian approach tends to yield lower error bars than the frequentist approach, suggesting that a careful analysis of the different interpretations is needed. Using this method, we estimate fNL=-10+270-260 at the 2σ level (Bayesian) and fNL=-10+310-270 (frequentist). Moreover, we find that the wavelet and the local curvature approaches, which provide similar error bars, yield approximately uncorrelated estimates of fNL and therefore, as advocated in the work of Cabella et al., the estimates may be combined to reduce the error bars. In this way, we obtain fNL=-5 +/- 85 and fNL=-5 +/- 175 at the 1σ and 2σ level respectively using the frequentist approach
Ceramic production and raw materials in the tuscan-ligurian region: an archaeological and petrographic approach in a diachronic perspective.
No full textThis contribution focuses on the history of ceramic production of a large geographic area of NW Italy summarized from an archaeological point of view but employing a petrographic approach. In this work we will briefly summarize the data and acquisitions mainly relating to the area between western Liguria and north-western Tuscany, also considering comparisons with the Central-South Italian volcanic area (S-Tuscany, Latium and Campania). The scope of our research is to reconstruct the productive districts combining information from Prehistory to the late Roman, Medieval, and post-medieval ages in a diachronic perspective. The region under study is characterized by a marked geodiversity allowing the definition of specific production areas based on minero-petrographic (including paleontological) data. Our long-term research combines information collected from different archaeological sources, from prehistoric ceramics to Roman pottery workshops identified in the region. This diachronic approach allows the definition of subregional productive districts characterized by the mineralogical-petrographic content of the products, that can be considered as fingerprints for pottery provenance. Our goal is to promote a «green archaeometry/green archaeology» approach, recycling and reusing old samples for reanalysis, rather than resample for new analyses and to limit new sampling to the strict necessary
Bartolomeo Cabella e il suo Tecnomasio: storia di un fallimento
No full textTo set up and develop the electromechanical sector was one of the biggest challenges facing industrializing countries in the last decades of the 19th century.
As it is well known, Germany and United States won the competition. Among the many crucial factors, it must be underlined the key role played by a number of inventors-entrepreneurs such as Edison, Thompson or Siemens. As they have been successful men, their biographies have been thoroughly analysed. Their technical and management capabilities have been pointed out as well as the financial and institutional framework in which they moved.
Less attention has been deserved to the many losers who entered the electrical industry in its early phase, when barriers were low and new firms could be easily established in order to produce innovative devices and machines.
Bartolomeo Cabella was one of them. Taken a degree in engineering at the Polytechnic of Milan (1868), he found an employment at the Tecnomasio, an enterprise created in the aftermath of the Italian unification (1881) by scientists and militaries interested in manufacturing measurement gadgets to be utilized by mechanical, chemical and physical laboratories. In a few years, he became the technical director of the firm and began to project and construct electromechanical machinery. In a new type of dynamo he is told to come earlier than Gramme and the arc lamps he designed gave light to the famous international exhibit hold in Milan in the 1881.
He acquired a partnership in the Tecnomasio in the 70’s and, in the 1898, he promoted the foundation of a public company, the Tecnomasio Italiano Bartolomeo Cabella. He was technical manager as well as executive chief.
At first, the run of business was very good, but, in a couple of years, many financial and technical problems arose. Finally, Bartolomeo Cabella was forced to resign and the majority of the shareholders decided to draw up a joint venture with the Suiss Company Brown Boveri. Thus, the only Italian manufacture of electric machinery went off.
Aim of the paper is to analyse this pioneering entrepreneurial experience attempting to explain why it failed. In particular, attention will turn on Cabella’s merits and fault, as well as on the policies accomplished by capitalists and stakeholder
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