GLORIA

GEOMAR Library Ocean Research Information Access

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    In: Applied Sciences, MDPI AG, Vol. 10, No. 19 ( 2020-10-04), p. 6951-
    Kurzfassung: For many years, surface has quality received a serious attention due to its influence on various mechanical properties. The main contribution made in this scientific paper is the performance of actual experiments, as well as the experimental processing obtained in order to develop a model for predicting the surface roughness based on the optimization of cutting parameters. The novelty of this paper is brought by the method of obtaining the regression equation of the surface roughness, resulted from a standard end-milling process (standard milling tools, standard milling parameters, recommended by the tool manufacturer, 3 axis CNC machine and standard vice), on aluminum alloy 7136 in temper T76511, through two statistical methods of data analysis. This material is used for the production of extruded parts and is poorly understood for the proposed line of research. This study’s aim is to determine the surface roughness equation obtained by the milling of aluminum alloy 7136 in two ways: using Taguchi′s experimental design once and the other, using the central composite design. The Taguchi method and the central composite design are used to develop an efficient mathematical model to predict the optimal level of certain processing parameters. Using ANOVA analysis, a comparative study of calculated and experimental surface roughness values is carried out. The initial characteristics (surface roughness) and the controlled factors (cutting speed, depth of cut and feed) are analyzed with the Minitab program. Finally, an analysis of the advantages and disadvantages of the two methods used is presented. This study has a great industrial application, since the main task of every manufacturer is to achieve a better quality of the final product with minimal processing time.
    Materialart: Online-Ressource
    ISSN: 2076-3417
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2704225-X
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    In: Materials, MDPI AG, Vol. 13, No. 22 ( 2020-11-20), p. 5257-
    Kurzfassung: The scientific paper presents practical research carried out by a mixed team of Romanian researchers from universities and the business environment. The research consists in applying the process of cutting metallic materials through electrical discharge machining with contact breaking using a metal band as a transfer object. The research was implemented with the help of a specially designed installation in the laboratory and subsequently all the necessary steps were taken to obtain the patent for it. Various metallic materials were cut using this process, but first of all, high alloy steels. In the global research conducted by the authors, active experimental programs and classic experimental programs were used. The composite central factorial experiment was the method that led to the most effective results in terms of interpretations and conclusions. The research as a whole includes unique elements from an engineering point of view and here we can highlight the use of a metal band as a transfer object for this type of process as well as the designed, realized, and subsequently patented installation.
    Materialart: Online-Ressource
    ISSN: 1996-1944
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2487261-1
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    In: Sustainability, MDPI AG, Vol. 16, No. 13 ( 2024-06-21), p. 5292-
    Kurzfassung: This scientific paper explores the increasingly widespread use of collaborative and industrial robots in the industrial environment, highlighting them as a solution to challenges related to the high costs of human labor and associated management difficulties. The authors focus on the process of defining requirements for the implementation of collaborative and industrial robots, providing strategies based on mathematical management models. This approach translates into significant benefits for companies, such as cost reduction, quality improvement, and increased operational efficiency. Additionally, the paper proposes an innovative mathematical model for assessing total costs, budgeting, profitability, and electric power consumption associated with the operation of collaborative and industrial robots. This model allows for a comparison between the costs involved in using human labor and those associated with collaborative and industrial robots, providing critical information for technological investment decisions. The efficiency of this mathematical model is demonstrated through a practical application, where collaborative robots were integrated into a production environment and costs and efficiency were evaluated compared to the use of human labor and industrial robots. This scientific paper provides a systematic and efficient approach to implementing collaborative robots in industrial processes, benefiting from strategies based on mathematical management models and an original mathematical model for evaluating performance and associated costs.
    Materialart: Online-Ressource
    ISSN: 2071-1050
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2024
    ZDB Id: 2518383-7
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    In: Processes, MDPI AG, Vol. 10, No. 8 ( 2022-08-12), p. 1585-
    Kurzfassung: The paper aims to capitalize on the new features that are offered by the Microsoft Excel calculation program for reliability modeling, using the Median Ranks estimator that is calculated directly with the BETA.INV function, not estimated by various algebraic estimators, as is generally the case. Starting from this first step, a method of modeling reliability is elaborated through the three-parametric Weibull model that is based exclusively on this software, which is accessible to anyone and can be used even in the case of online learning, which is widespread in recent years due to the pandemic situation. The probability plotting method is applied, using the Median Ranks estimator that is calculated directly with the BETA.INV function for a probability equal to 0.5. A flowchart is made for the proposed method, which could be easily translated into a calculation program. By representing in logarithmic coordinates, we determined the Weibull models for different values that were initially adopted for the location parameter: using as a criterion the coefficient of determination that was obtained using the trendline function for the linear model, it was possible to identify, by successive tests, the optimal value of the location parameter—for which the three-parametric model has a good likelihood. By the proposed method, this value can be found following this iterative process. So, based on the current facilities of the Microsoft Excel program, a precise and easy-to-apply method has been achieved, through which an appropriate three-parametric Weibull model can be identified.
    Materialart: Online-Ressource
    ISSN: 2227-9717
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2022
    ZDB Id: 2720994-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Online-Ressource
    Online-Ressource
    MDPI AG ; 2023
    In:  Processes Vol. 11, No. 3 ( 2023-03-06), p. 779-
    In: Processes, MDPI AG, Vol. 11, No. 3 ( 2023-03-06), p. 779-
    Kurzfassung: There are many criticisms for the association between the Six Sigma concept and the two statistical metrics associated to 6σ processes: 1.5σ shift for maximum deviation and 3.4 PPM non-conformities for the long-term performance. As a result, the paper aims to carry out an analysis of this problem, and the first result obtained is that a stable process can reach a maximum drift, but its value depends on the volume of the sample. It is also highlighted that, using only the criterion “values outside the control limits” for monitoring stability through the Xbar chart, a minimum value can be calculated for the long-term performance of a process depending on the sample size. The main conclusion resulting from the calculations is that, in the case of a 6σ process, the long-term performance is much better than the established value of 3400 PPB: For small volume samples of two pieces it is below 700 PPB, for three pieces it is below 200 PPB, and for samples with a volume greater than or equal to four pieces the performance already reaches values below 100 PPB! So, the long-term performance of 6σ processes is certainly even better than the known value of 3.4 PPM.
    Materialart: Online-Ressource
    ISSN: 2227-9717
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2023
    ZDB Id: 2720994-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Online-Ressource
    Online-Ressource
    Elsevier BV ; 2015
    In:  Procedia Economics and Finance Vol. 27 ( 2015), p. 126-135
    In: Procedia Economics and Finance, Elsevier BV, Vol. 27 ( 2015), p. 126-135
    Materialart: Online-Ressource
    ISSN: 2212-5671
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2015
    ZDB Id: 2691979-5
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2017
    In:  Balkan Region Conference on Engineering and Business Education Vol. 2, No. 1 ( 2017-12-20), p. 320-327
    In: Balkan Region Conference on Engineering and Business Education, Walter de Gruyter GmbH, Vol. 2, No. 1 ( 2017-12-20), p. 320-327
    Kurzfassung: The aim of this paper is to analyse from the educational point of view which are the interactions between online and offline, starting from a set of values that contribute to the stability and functionality of the knowledge-based economy. There are four factors that allow the integration and sharing of values through online and offline interactions: organizational culture, digital technology, implementation of creative methodologies and digital transformation. In this respect, the interactions specific to systems based on open governance were analyzed. Interactions between online and offline are also very important in the educational process. For this reason, we introduced a new concept, called TOTO ("Teaching Online, Transfer Offline" ↔ "Transfer Offline, Teaching Online"). This slogan is meant to promote the acquisition and transfer of knowledge in the future. Particular importance was given to studying the effects of the interactions between Personal Online Learning Networks and Offline Learning Teams. Since social media is a common tool for most socio-economic activities, it has been considered necessary to carry out a case study on the interactions specific to this environment.
    Materialart: Online-Ressource
    ISSN: 2391-8160
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2017
    ZDB Id: 2935624-6
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2013
    In:  Management Dynamics in the Knowledge Economy Vol. 6, No. 4 ( 2013), p. 627-643
    In: Management Dynamics in the Knowledge Economy, Walter de Gruyter GmbH, Vol. 6, No. 4 ( 2013), p. 627-643
    Materialart: Online-Ressource
    ISSN: 2392-8042
    URL: Issue
    Sprache: Unbekannt
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2013
    ZDB Id: 2819566-8
    SSG: 3,2
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    In: Annals of the Academy of Romanian Scientists Series on Engineering Sciences, Academia Oamenilor de Stiinta din Romania, Vol. 15, No. 1 ( 2023), p. 5-20
    Kurzfassung: In the context of sustainable development and continuous improvement, it can be stated that the implementation of an integrated quality management in a modern organization can only be achieved under the conditions of implementing a series of concepts, among which we can mention knowledge management, total quality management, Kaizen management and related standards, quality management strategies and policies but also quality management techniques, methods, and tools. The scientific paper presents an own point of view regarding the pathway for a sustainable implementation of the previously presented concepts in an organization in the automotive field. The aspects identified in a real organization in the automotive industry are presented as well as the way considered to be possible to implement so that the organization can be considered a knowledge-based organization. In this context, the role of management in the organization is extremely important and value analysis becomes a priority. The main objective of the scientific paper is to propose a certain way of managerial thinking so that those interested can apply the quality management strategies and policies proposed for the sustainable implementation of total quality management within an organization based on knowledge in the automotive field.
    Materialart: Online-Ressource
    ISSN: 2066-6950 , 2066-8570
    URL: Issue
    Sprache: Unbekannt
    Verlag: Academia Oamenilor de Stiinta din Romania
    Publikationsdatum: 2023
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    In: Molecules, MDPI AG, Vol. 26, No. 9 ( 2021-04-28), p. 2577-
    Kurzfassung: In this research, polyvinyl-alcohol (PVA)/gelatin (GEL)/propolis (Ps) biocompatible nanofiber patches were fabricated via electrospinning technique. The controlled release of Propolis, surface wettability behaviors, antimicrobial activities against the S. aureus and P. aeruginosa, and biocompatibility properties with the mesenchymal stem cells (MSCs) were investigated in detail. By adding 0.5, 1, and 3 wt.% GEL into the 13 wt.% PVA, the morphological and mechanical results suggested that 13 wt.% PVA/0.5 wt.% GEL patch can be an ideal matrix for 3 and 5 wt.% propolis addition. Morphological results revealed that the diameters of the electrospun nanofiber patches were increased with GEL (from 290 nm to 400 nm) and Ps addition and crosslinking process cause the formation of thicker nanofibers. The tensile strength and elongation at break enhancement were also determined for 13 wt.% PVA/0.5 wt.% GEL/3 wt.% Ps patch. Propolis was released quickly in the first hour and arrived at a plateau. Cell culture and contact angle results confirmed that the 3 wt.% addition of propolis reinforced mesenchymal stem cell proliferation and wettability properties of the patches. The antimicrobial activity demonstrated that propolis loaded patches had antibacterial activity against the S. aureus, but for P. aeruginosa, more studies should be performed.
    Materialart: Online-Ressource
    ISSN: 1420-3049
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2021
    ZDB Id: 2008644-1
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...