Refine
Year of publication
- 2013 (84) (remove)
Document Type
- Conference Proceeding (26)
- Article (unreviewed) (18)
- Article (reviewed) (17)
- Bachelor Thesis (16)
- Master's Thesis (3)
- Book (2)
- Part of a Book (1)
- Letter to Editor (1)
Conference Type
- Konferenzartikel (23)
- Konferenz-Abstract (1)
- Konferenz-Poster (1)
- Sonstiges (1)
Keywords
- Energieversorgung (3)
- Werbung (3)
- Batterie (2)
- Bussystem (2)
- Erfolgsfaktoren (2)
- Funktionalität (2)
- Gehirn (2)
- Haustechnik (2)
- Informatik (2)
- Internet (2)
- JavaScript (2)
- Kohlenstoff (2)
- Kommunikation (2)
- Messung (2)
- Recht (2)
- Spektroskopie (2)
- e-mail (2)
- jQuery Mobile (2)
- 3D-Gestensteuerung (1)
- AMBA AXI (1)
- AR SDK (1)
- Abmahnung (1)
- Abonnement (1)
- Adobe Creative Suite (1)
- Adsorption (1)
- Akustische Oberflächenwelle (1)
- Ankerwickeln (1)
- App <Programm> (1)
- Applikation (1)
- Argento (1)
- Audiotechnik (1)
- Aufzeichnung (1)
- Automatisierungssystem (1)
- Bava (1)
- Benutzeroberfläche (1)
- Biolumineszenz (1)
- Business Intelligence (1)
- Bussysteme (1)
- Bürohaus (1)
- CAE (1)
- Cascading Style Sheets 3 (1)
- Computersicherheit (1)
- Computerunterstützte Kommunikation (1)
- Controlling (1)
- Crossmedia (1)
- Crossmedia-Marketing (1)
- Crowdfunding (1)
- Dario (1)
- Datenschutz (1)
- Diesel-Ethanol-Mischkraftstoff (1)
- Drahtloses lokales Netz (1)
- Druck (1)
- Dünnschichtchromatographie (1)
- E-Learning (1)
- E-Mail (1)
- Einkauf (1)
- Electronic Commerce (1)
- Elektronische Musik (1)
- Empfehlung (1)
- Endgerät (1)
- Energieeffizienz (1)
- Entwicklung (1)
- Ermüdung (1)
- Erweiterte Realität <Informatik> (1)
- Ethanol (1)
- FPGA (1)
- FT-Raman-Spektroskopie (1)
- Fachwissen (1)
- Farbe (1)
- Fertigungsautomation (1)
- Finite-Elemente-Methode (1)
- Formular (1)
- Formulierung (1)
- Framework <Informatik> (1)
- Gateway (1)
- Gewebe (1)
- HTML (1)
- HTML 5 (1)
- HTML5 (1)
- Hochtemperaturbrennstoffzelle (1)
- IT infrastructure library V2 (1)
- ITSM (1)
- Impressum (1)
- Informationstechnologie (1)
- Intelligenter Zähler (1)
- Interaktiv (1)
- Japanisch (1)
- Journalismus (1)
- Kardiale Resynchronisationstherapie (1)
- Katalyse (1)
- Kaufpreis (1)
- Kinect (1)
- Kinematik (1)
- Kinetik (1)
- Klimaschutz (1)
- Klimatechnik (1)
- Kommunikationsagentur (1)
- Komponente <Software> (1)
- Korrosion (1)
- Kraftstoff (1)
- Kraftwerk (1)
- Kristallstruktur (1)
- Kunst (1)
- Kühlung (1)
- Leistungselektronik (1)
- Lithiumbatterie (1)
- Lizenz (1)
- Luftzerlegung (1)
- MAX 3ds (1)
- Management by Objectives (1)
- Mario (1)
- Mathematisches Modell (1)
- Medienmarketing (1)
- Medientechnik (1)
- Medizin (1)
- Membran (1)
- Mensch-Maschine-Schnittstelle (1)
- Mobile Computing (1)
- Mobiles Endgerät (1)
- Molekularsieb (1)
- Multimedia (1)
- Musik (1)
- Musikproduktion (1)
- Nervenkrankheit (1)
- Nickel (1)
- Niedrigenergiehaus (1)
- Nutzfläche (1)
- Nutzung (1)
- Olympische Spiele (1)
- Online (1)
- Online-Portal (1)
- Onlineshop (1)
- OpenLayers (1)
- Optik (1)
- Oxidation (1)
- Personalberatung (1)
- Pflichtenheft (1)
- Photovoltaik (1)
- Plastische Chirurgie (1)
- Plastizität (1)
- Polymere (1)
- Portrait (1)
- Profondo rosso (1)
- Programmierung (1)
- Prozessablauf (1)
- Qualität (1)
- Quantität (1)
- Rahmenvertrag (1)
- Raumklima (1)
- Raumstation (1)
- Rechtswissenschaft (1)
- Rohrnetz (1)
- Rotationskörper (1)
- Schale (1)
- Schrittmacher (1)
- Schutz (1)
- Sci Fi (1)
- Sensortechnik (1)
- Sicherheit (1)
- Signaltechnik (1)
- Smartphone (1)
- Software (1)
- Sounddesign (1)
- Sprache (1)
- Stahl (1)
- Steuerung (1)
- Stimulation (1)
- Stromregelung (1)
- Synthese (1)
- System (1)
- System Center Configuration Manager 2007 (1)
- Technik (1)
- Telefonverkauf (1)
- Thermomechanik (1)
- Trajektorie (1)
- Trägheit (1)
- Unity3d (1)
- Unterlassung (1)
- Urheberrecht (1)
- User-Interface (1)
- Verfahrenstechnik (1)
- Verlagsrecht (1)
- Vorlesung (1)
- Vray (1)
- Vuforia (1)
- WOM marketing (1)
- WOM-Marketing (1)
- Wasser (1)
- Web 2.0 (1)
- Web-App (1)
- Webdesign (1)
- Websites (1)
- Welle (1)
- Werberecht (1)
- Wettbewerbsverstoß (1)
- Wirtschaft (1)
- YouTube (1)
- Zelle (1)
- Zufriedenheit (1)
- Zusammenarbeit (1)
- e-Mobilität (1)
- e-learning (1)
- eBook (1)
- electronic music (1)
- factors of success (1)
- iPad (1)
- music production (1)
- viral marketing (1)
- viral-marketing (1)
- web 2.0 (1)
Institute
- Fakultät Medien und Informationswesen (M+I) (bis 21.04.2021) (35)
- Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019) (31)
- Fakultät Maschinenbau und Verfahrenstechnik (M+V) (15)
- INES - Institut für nachhaltige Energiesysteme (7)
- Fakultät Wirtschaft (W) (2)
- IUAS - Institute for Unmanned Aerial Systems (1)
Open Access
- Closed Access (84) (remove)
High-precision signal processing algorithm to evaluate SAW properties as a function of temperature
(2013)
This paper presents a signal processing algorithm which accurately evaluates the SAW properties of a substrate as functions of temperature. The investigated acoustic properties are group velocity, phase velocity, propagation loss, and coupling coefficient. With several measurements carried out at different temperatures, we obtain the temperature dependency of the SAW properties. The analysis algorithm starts by reading the transfer functions of short and long delay lines. The analysis algorithm determines the center frequency of the delay lines and obtains the delay time difference between the short and long delay lines. The extracted parameters are then used to calculate the acoustic properties of the SAW material. To validate the algorithm, its accuracy is studied by determining the error in the calculating delay time difference, center frequency, and group velocity.
Raman spectra from three different binary gasoline-ethanol blends (with ratios 95:5, 90:10, and 85:15) have been obtained by using a low-cost, frequency precise Fourier-transform Raman spectrometer (FT-Raman) prototype. The spectral information is presented in the range of 0 to 3500 cm-1 with a resolution of 1.66 cm-1, which is greater than the required for most liquid and solid chemical samples. This set-up delivers spectral information about the sample with a reduced spectral deviation compared to theoretical values (less than 0.4 cm-1 without compensation for instrumental response). The robust and highly fexible FT-Raman prototype presented for the spectral analysis, consisting mainly of a Michelson interferometer and a self-designed photon counter, is able to deliver high resolution and frequency precise Raman spectra from the gasoline-ethanol blends comparable to the obtained by using commercial devices. This FT-Raman set-up does not need additional complex hardware or software control and relies on re-sampling and interpolation algorithms. The qualitative spectral information obtained has been used to calculate the proportion of gasoline and ethanol present in the used chemical samples without using extra calibrations methods or chemical markers.
Background: Increasing awareness of the importance of evidence-based medicine is demonstrated not only by an increasing number of articles addressing it but also by a specialty-wide evidence-based medicine initiative. The authors critically analyzed the quality of reporting of randomized controlled trials published in this Journal over a 21-year period (1990 to 2010).
Methods: A hand search was conducted, including all issues of Plastic and Reconstructive Surgery from January of 1990 to December of 2010. All randomized controlled trials published during this time period were identified with the Cochrane decision tree for identification of randomized controlled trials. To assess the quality of reporting, a modification of the checklist of the Consolidated Standard of Reporting Trials Statement was used.
Results: Of 7121 original articles published from 1990 to 2010 in the Journal, 159 (2.23 percent) met the Cochrane criteria. A significant increase in the absolute number of randomized controlled trials was seen over the study period (p < 0.0001). The median quality of these trials from 1990 to 2010 was "fair," with a trend toward improved quality of reporting over time (p = 0.127).
Conclusions: A favorable trend is seen with respect to an increased number of published randomized controlled trials in Plastic and Reconstructive Surgery. Adherence to standard reporting guidelines is recommended, however, to further improve the quality of reporting. Consideration may be given to providing information regarding the quality of reporting in addition to the "level of evidence pyramid," thus facilitating critical appraisal.
Die Zuverlässigkeit und Betriebssicherheit von Feldgeräten ist für den sicheren und wirtschaftlichen Betrieb prozesstechnischer Anlagen unerlässlich. Ein entscheidender Faktor ist die Widerstandskraft der Geräte gegen die herrschenden Umgebungsbedingungen. Durch Korrosionsschäden hervorgerufene Anlagenstillstände zeigen, dass diesem Thema nicht immer die notwendige Aufmerksamkeit gewidmet wird, obwohl die korrosionsbedingten wirtschaftlichen Schäden immens sind. Wie man mit dem Thema Korrosionsschutz ernsthaft umgehen kann, zeigt dieser Beitrag am Beispiel elektrischer Stellantriebe.
Energy consumption for cooling is growing dramatically. In the last years, electricity peak consumption grew significantly, switching from winter to summer in many EU countries. This is endangering the stability of electricity grids. This article outlines a comprehensive analysis of an office building performances in terms of energy consumption and thermal comfort (in accordance with static – ISO 7730:2005 – and adaptive thermal comfort criteria – EN 15251:2007 –) related to different cooling concepts in six different European climate zones. The work is based on a series of dynamic simulations carried out in the Trnsys 17 environment for a typical office building. The simulation study was accomplished for five cooling technologies: natural ventilation (NV), mechanical night ventilation (MV), fan-coils (FC), suspended ceiling panels (SCP), and concrete core conditioning (CCC) applied in Stockholm, Hamburg, Stuttgart, Milan, Rome, and Palermo. Under this premise, the authors propose a methodology for the evaluation of the cooling concepts taking into account both, thermal comfort and energy consumption.
In this paper, an unconditionally stable algorithm for the numerical integration and finite-element implementation of a class of pressure dependent plasticity models with nonlinear isotropic and kinematic hardening is presented. Existing algorithms are improved in the sense that the number of equations to be solved iteratively is significantly reduced. This is achieved by exploitation of the structure of Armstrong-Frederik-type kinematic hardening laws. The consistent material tangent is derived analytically and compared to the numerically computed tangent in order to validate the implementation. The performance of the new algorithm is compared to an existing one that does not consider the possibility of reducing the number of unknowns to be iterated. The algorithm is used to implement a time and temperature dependent cast iron plasticity model, which is based on the pressure dependent Gurson model, in the finite-element program ABAQUS. The implementation is applied to compute stresses and strains in a large-scale finite-element model of a three cylinder engine block. This computation proofs the applicability of the algorithm in industrial practice that is of interest in applied sciences.
In this paper the fatigue life of three cast iron materials, namely EN-GJS-700, EN-GJV-450 and EN-GJL-250, is predicted for combined thermomechanical fatigue and high cycle fatigue loading. To this end, a mechanism-based model is used, which is based on microcrack growth. The model considers crack growth due to low frequency loading (thermomechanical and low cycle fatigue) and due to high cycle fatigue. To determine the model parameters for the cast iron materials, fatigue tests are performed under combined loading and crack growth is measured at room temperature using the replica technique. Superimposed high cycle fatigue leads to an accelerated crack growth as soon as a critical crack length and thus the threshold stress intensity factor is exceeded. The model takes this effect into account and predicts the fatigue lives of all cast iron materials investigated under combined loadings very well.