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  • 1
    Electronic Resource
    Electronic Resource
    Tool Path Design in Friction Stir Spot Welding of AA6082-T6 Aluminum Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 767-774 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the paper, a variation of the Friction Stir Spot Welding (FSSW) process has beenconsidered. In particular, a particular tool path is given after the sinking phase nearby the initialpenetration site. The process mechanics was highlighted and the joint strength was considered at thevarying of the most relevant process parameters. Furthermore macro and micro analyses weredeveloped in order to highlight the process mechanics and the local material microstructureevolution. The investigated technology appears a promising joining technique in order to developeffective spot joints
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.767.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Investigations on the Mechanical Properties and Formability of Friction Stir Welded Tailored Blanks (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 143-150 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Tight competition characterizing automotive industries in the last decades has determineda strong research effort aimed to improve utilized processes and materials in sheet stamping. As faras the latter are regarded light weight alloys, high strength steels and tailored blanks have beenincreasingly utilized with the aim to reduce parts weight and fuel consumptions. In the paper themechanical properties and formability of tailored welded blanks made of a precipitation hardenablealuminum alloy but with different sheet thicknesses, have been investigated: both laser welding andfriction stir welding have been developed to obtain the tailored blanks. For both welding operationsa wide range of the thickness ratios has been considered. The formability of the obtained blanks hasbeen characterized through tensile tests and cup deep drawing tests, in order to show the formabilityin dependency of the stress condition; what is more mechanical and metallurgical investigationshave been made on the welded joints
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.143.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructural Changes Determining Joint Strength in Friction Stir Welding of Aluminium Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 6-8 (May 2005), p. 591-598 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the paper the results of a wide experimental activity on friction stir welding (FSW) of aluminum alloys are reported. In particular the butt joints of two different materials, namely AA1050-O and AA6082-T6 were considered. Grains dimensions and precipitates density were investigated both in the parent materials and after the welding processes. Furthermore post-welding heat treatments effects on the joint strength were studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.6-8.591.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Reliability of semi-classical calculations for collisional lineshapes in thev 2 ammonia band (1987)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 903-907 
    Details
    ISSN: 0392-6737
    Keywords: Line and band widths, shapes and shifts ; Infrared spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Diode laser measurements, recently published for self- and N2 broadening in thev 2 ammonia band, are proved in agreement with predictions of the semi-classical ATC theory. Discrepancies for the self-shifts calculated by other authors are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453758
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  • 5
    Electronic Resource
    Electronic Resource
    High-resolution measurements of pressure self-broadening and shift for the metyl-cyanide rotationalJ=1−0 line (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 511-518 
    Details
    ISSN: 0392-6737
    Keywords: Intensities and shapes of molecular spectral line and bands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si discutono le prestazioni di uno spettrometro a microonde ad onda progressiva nel campo della spettroscopia ad alta risoluzione in gas a bassa pressione. Sono in particolare considerati alcuni aspetti delle procedure sperimentali e dell'elaborazionedei dati che hanno portato a decisi miglioramenti nella sensibilità e nelle prestazioni complessive dell'apparato sperimentale. Sono stati misurati per la riga rotazionaleJ=1–0 di CH3C14N un coefficiente di autoallargamento per pressione di (72.5±1.5) MHz/Torr e uno shift di (4.3±0.3) MHz/Torr. Queste misure risultano piú accurate di quelle precedentemente riportate e in migliore accordo con le previsioni teoriche.
    Abstract: Резюме Обсуждаются возможности использования микроволнового спектрометра со скользящей волной для измерений с высоким разрешением в газах при низких давлениях. Рассматриваются основные аспекты экспериментальной процедуры и обработки данных, которые позволяют улучшить чувствительность аппаратуры. Измерены величины самоуширения с давлением (72.5±1.5) МГц/Тор и сдвига с давлением (4.3±0.3) МГц/Тор для ротационной линииJ=1–0 для CH3C14N. Полученные результаты являются более точными, чем ранее опубликованные, и лучше согласуются с теоретическими предесказаниями.
    Notes: Summary The capabilities of the travelling-wave spectrometry in the field of high-resolution measurements of low-pressure gases at microwave frequencies are discussed. Some details about the main aspects of the experimental procedure and the data management, useful for the improvement of overall performances, are specified. A pressure broadening of (72.5±1.5) MHz/Torr and a pressure shift of (4.3±0.3) MHz/Torr are measured for theJ=1−0 rotational line of CH3C14N. These results are more accurate than those previously reported and in better agreement with the theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453292
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  • 6
    Electronic Resource
    Electronic Resource
    A review of experiments and theory for collisional line shape effects in the rotovibrational ammonia spectrum (1991)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 719-733 
    Details
    ISSN: 0392-6737
    Keywords: Intensities and shapes of molecular spectral lines and bands ; PACS 33.20 ; Molecular spectra, grouped by wavelength ranges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary 455 self-broadening, self-shift and foreign gas (N2 and CO2) broadening measurements forv 2 andv 4 ammonia vibrational bands are compared to theoretical calculations performed in the frame of the semi-classical impact approximation. On the whole the agreement is satisfactory. However, a detailed analysis of the experimental and theoretical results shows some shortcomings in the accuracy of the experimental data and in the validity of the theoretical approach. General indications are given in order to improve further the description of the collisional line shape effects which is of great interest both for basic knowledge and for various applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452217
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of a forbidden ammonia transition: Confirmation by pressure broadening measurements (1985)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 5 (1985), S. 415-418 
    Details
    ISSN: 0392-6737
    Keywords: Molecular spectra, grouped by wave-length ranges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Misure di allargamento per pressione confermano l'identificazione della riga proibita dell'ammoniacass −3 P(4,3) a 887.780 cm−1. Inoltre il suo spostamento per pressione insieme agli spostamenti di transizioni submillimetriche dimostra ancora una volta la validitá dell'additività negli spostamenti.
    Notes: Summary Pressure broadening measurements confirm the identification of the forbidden ammonia transitionss −3(4, 3) at 887.780 cm−1, Moreover, its pressure shift together with those of submillimeter transitions adds new confidence on the validity of the shift additivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450646
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  • 8
    Electronic Resource
    Electronic Resource
    The pressure broadening and shift for theJ=1−0 line of CH3C14N: Resolved and overlapped hyperfine components (1986)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 7 (1986), S. 105-112 
    Details
    ISSN: 0392-6737
    Keywords: Intensities and shapes of molecular spectral lines and bands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sono stati misurati i parametri di allargamento e spostamento per pressione della rigaJ=1−0 del CH3C14N a 18.4 GHz. Tali misure sono state eseguite, sulle tre componenti iperfini e sul loro inviluppo osservato a pressionip≥40 mTorr. In accordo con le previsioni teoriche, questi parametri risultano gli stessi per tutte le righe osservate: Γ p = (50 ± 5) MHz/Torr,s=(7±2) MHz/Torr. Questi valori sono confrontati con quelli delle precedenti misure che mostrano una considerevole dispersione, specialmente per quanto riguarda il parametro di spostamento. L'allargamento per pressione è risultato piú basso di quello previsto dalla teoria di Anderson di circa il 40%.
    Notes: Summary Pressure broadening and shift parameters are measured for theJ=1−0 line of CH3C14N at 18.4 GHz, both for the three hyperfine components and for the single line which envelopes the hyperfine components, observed at higher pressures (p≥40 mTorr). In agreement with theoretical predictions, these parameters are the same for all the observed lines: Γ p = (50 ± 5) MHz/Torr,s=(7±2) MHz/Torr. These values are compared with previous measurements, showing a large variance expecially for the shift parameter. The measured broadening parameter is 40% lower than prediction of the Anderson theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02452400
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  • 9
    Electronic Resource
    Electronic Resource
    Collisional line shape for the rotational spectrum of methylcyanide: Experiments and theory (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6881-6886 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A collisional line-shape study specialized in the rotational spectrum of CH3CN is presented. This system provides a test for pressure broadening and shift theories which has until now been hindered by inadequate theory and by experimental results at variance. New accurate measurements are presented which allow an explanation of the problem related to the reliability of experimental data. The thorough comparison made between measurements and an improved theory—obtained inside the frame of the Anderson–Tsao–Curnutte approximation—demonstrates the ripeness of the study of such rotational spectrum from both the experimental and theoretical points of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456262
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  • 10
    Electronic Resource
    Electronic Resource
    Self-broadening and self-shifting of ammonia lines in the 2ν2 band around 16 μm (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4975-4977 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the pressure broadening and shift of several transition lines of ammonia, 14NH3, in the 2ν2 band around 16 μm. Satisfactory agreement is found between the experimental results and a slightly modified version of the Anderson theory. A comparison between the theory and measurements of other authors has also been made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449761
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