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Effect of Double Air Injection on Instability Phenomena in Centrifugal Compressor

Open Journal of Fluid Dynamics 2017年第3期7卷 462-474页

作者： Toshiyuki Hirano Tatsuya Ogawa Hoshio Tsujita Mechanical Engineering Course Department of Science and Engineering Kokushikan University Tokyo Japan Graduate School of Engineering Program in Mechanical Engineering Kokushikan University Tokyo Japan Department of Mechanical Engineering Faculty of Science and Engineering Hosei University Tokyo Japan

In the operation of a centrifugal compressor of turbocharger, instability phenomena such as rotating stall and surge are induced at a lower flow rate close to the maximum pressure ratio. In this study, the compressed air at the exit of centrifugal compressor was re-circulated and injected to the impeller inlet by using two injection nozzles in order to suppress the surge phenomenon. The most effective circumferential position was examined to reduce the flow rate at the surge inception. Moreover, the influences of the injection on the fluctuating property of the flow field before and after the surge inception were investigated by examining the frequency of static pressure fluctuation on the wall surface and visualizing the compressor wall surface by oil-film visualization technique.

关键词： Centrifugal Compressor Performance Nozzle Injection Surge

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Effect of Double Air Injection on Performance Characteristics of CentrifugalCompressor

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Journal of Thermal science 2017年第1期26卷 11-17页

作者： Toshiyuki Hirano Tatsuya Ogawa Ryutaro Yasui Hoshio Tsujita Mechanical Engineering Course Department of Science and Engineering Kokushikan University 4-28-1 SetagayaSetagaya City Tokyo 154-8515 Japan Graduate School of Engineering Program in Mechanical Engineering Kokushikan University Nexco-East Engineering Company Limited Department of Mechanical Engineering Faculty of Science and Engineering Hosei University 3-7-2 Kajino-choKoganei City Tokyo 184-8584 Japan

关键词： Centrifugal Compressor, Performance, Nozzle Injection, Surge

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Toward Learning Factory for Industry 4.0: Virtual Reality (VR) for Learning Human–Robot Collaboration 1

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International Conference on Innovative Technologies in Intelligent Systems and Industrial Applications, CITISIA 2022

作者： Ariansyah, Dedy Colombo, Giorgio Pardamean, Bens Bioinformatics and Data Science Research Centre Bina Nusantara University Jakarta11480 Indonesia Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University Jakarta11480 Indonesia

ISBN: (数字)9783031290787

ISBN: (纸本)9783031290770

Industry 4.0 will bring not only transformation to the manufacturing technologies but also to the profile of the workforce. Education system should be revised to prepare the future graduates embracing the knowledge of the ongoing revolution. Initiatives on the modification of curriculum and tools to deliver the concepts of Industry 4.0 must be taken. This paper examines limitations of current engineering tools and proposes a virtual reality (VR)-based learning platform to support the teaching and learning activity for Industry 4.0, focusing on the design of Human–robot Collaboration (HRC). The development process began with the identification of the general Intended Learning Outcomes (ILOs) which were extracted from the review of the HRC design issues, followed by the evaluation of the current teaching tool. From these results, the new requirements of the tools to achieve ILOs are redefined. The implementation of the system is demonstrated to show the feasibility of the proposed learning platform. This workflow can serve as initial development of another learning platform for the other innovative concepts that form the building blocks of Industry 4.0. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Industry 4.0

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The effect of visual advanced driver assistance systems on a following human driver in a mixed-Traffic condition 7

The effect of visual advanced driver assistance systems on a...

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7th International Conference on Computer science and Computational Intelligence, CSCI 2022

作者： Ariansyah, Dedy Pardamean, Bens Caruso, Giandomenico Bioinformatics and Data Science Research Centre Bina Nusantara University Jakarta11480 Indonesia Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University Jakarta11480 Indonesia Department of Mechanical Engineering Politecnico di Milano Milan 20156 Italy

Rapid development in vehicular technology has caused more automated vehicle control to increase on the roads. Studies showed that driving in mixed traffic with an autonomous vehicle (AV) had a negative impact on the time headway (THW) of conventional vehicles (CVs) (i.e., driven by humans). To address this issue, there is a need to equip CV with visual advanced driver assistance systems (ADASs) that helps the driver maintain safe headway when driving near AVs. This study examines the perception of drivers using visual ADAS and their associated risk while driving behind the AV at constant and varying speeds. The preliminary results showed that while visual ADAS could help drivers keep the safe THW, it could affect drivers' ability to react to emergencies. This implies that visual modality alone might not be sufficient and therefore requires some other feedback or intelligent transport systems to help drivers maintain safe driving in a mixed-Traffic condition. © 2022 Elsevier B.V.. All rights reserved.

关键词： Advanced driver assistance systems

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Effect of tin on the recrystallization behavior and texture of grain oriented electrical steels

Effect of tin on the recrystallization behavior and texture ...

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materials Processing and Texture - 15th International Conference on Textures of materials, ICOTOM 15

作者： Liao, Chun-Chih Hou, Chun-Kan Graduate School of Engineering Science and Technology Doctoral Program National Yunlin University of Science and Technology 123 University Road Douliou Yunlin 64002 Taiwan Department of Mechanical Engineering National Yunlin University of Science and Technology 123 University Road Douliou Yunlin 64002 Taiwan

ISBN: (纸本)9780470408346

Influence of tin, range from 0-0.31wt%, on the recrystallization behavior and texture of grain oriented electrical has been investigated. Tin is susceptible to segregation at grain boundary and on surface that pinning down the grain boundary mobility. Annealed hot bands in 2.5mm are cold rolled to 0.35 mm in one-stage cold rolling. Cold-rolled sheets are decarburization annealing at 800°C for 5 minutes in wet H2-N2 atmosphere. During secondary recrystallization specimens are heated to 900~1200°C and soaked 12 hours with a heating rate 12 °C per hour after 700 °C. Both X-ray and EBSD are conducted to examine the grain orientation. It is found that pinning effect of tin is very strong for secondary recrystallization. The specimens containing less than 0.05wt% tin finish secondary recrystallization after SRT at 1000 °C. The secondary recrystallization grain growth became difficult as the tin content above 0.10wt%. According to EBSD results, after primary recrystallization, the intensity of (011) texture in the specimens with nitriding 30 seconds slightly increases with increasing tin content and reaches a maximum value at 0.05wt% tin. Then, it rapidly decreases with increasing tin and reaches a minimum at 0, 21wt% tin. Finally, it increases with increasing tin again. However, the intensity of (011) texture in the specimens without nitriding decreases with increasing tin content and reaches a minimum value at 0.21 wt% tin. Then, it increases with increasing tin. Both EBSD and XRD results show that the intensities of (111) textures in the specimens both with and without nitriding decreases with increasing tin content and reaches a value at 0.05 wt% tin. Then, it increases with increasing tin and reaches a peak at 0.1wt% tin. Finally, it decreases with increasing tin again. For the specimens without nitriding treatment, while the SRT is higher than 1100°C, best magnetic properties was occurred in the steel containing 0.05 wt% tin. However, the flux density increases and c

关键词： Nitriding

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Effect of sintering temperature on microstructural properties of bioceramic bone scaffolds

Effect of sintering temperature on microstructural propertie...

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Next Generation Biomaterials and Surface Properties of Biomaterials Symposia - materials science and Technology 2011 Conference and Exhibition, MS and T 2011

作者： Vivanco, Juan Araneda, Aldo Ploeg, Heidi-Lynn Material Science Program University of Wisconsin-Madison Madison WI United States Department of Mechanical Engineering University of Wisconsin-Madison Madison WI United States Department of Industrial Engineering Universidad Técnica Federico Santa María Valparaiso Chile

ISBN: (纸本)9781118273326

Bioactive calcium phosphate (CaP) scaffolds have emerged as synthetic alternatives to bone grafts, acting to target serious fracture healing and bone disease such as osteoporosis. Previous research has shown that these bioceramic materials due to their osteoinductive and biocompatible properties can potentially induce bone formation from the surrounding native tissue. Sintering temperature of CaP scaffolds has been shown to influence the microstructure and properties;however, a comprehensive study to determine the influence of sintering temperature on CaP scaffolds has yet to be performed. Thus, the objective of this work was to determine the microstructural properties of an injection molded CaP scaffold based on the crystallographic phases and grain arrangement for different sintering temperatures. The CaP scaffolds were fabricated using tricalcium phosphate and sintered at three different target temperatures. The microstructural and mechanical properties were characterized by different techniques such as: X-ray diffraction, scanning electron microscopy with associated energy dispersive X-ray spectroscopy, and micro-hardness. It was found that grain size, degree of density, crystallite size, and microhardness increased with increasing sintering temperature;whereas, the crystallographic and the Ca/P atomic ratio did not vary for a sintering temperature range of 950-1150°C. These results support the design and fabrication of bioceramic scaffolds with controlled microstructural properties to provide structural integrity and encourage bone ingrowth.

关键词： Crystallite size

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Lactate-pyruvate and growth proliferation levels of endothelial cells on extracellular matrix materials

Lactate-pyruvate and growth proliferation levels of endothel...

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24th European Conference on Biomaterials, EBS 2011

作者： Callanan, Anthony Guihen, Elizabeth Crean, Conor O'Connor, William T. Mcgloughlin, Tim Centre for Applied Biomedical Engineering Research Department of Mechanical and Aeronautical Engineering Ireland Material and Surface Science Institute Ireland Faculty of Education and Health Sciences Graduate Entry Medical School University of Limerick Ireland Department of Chemistry University College Cork Ireland

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Tandem multimer expression of angiotensin I-converting enzyme inhibitory peptide in Escherichia coli

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Biotechnology Journal 2009年第9期4卷 1345-1356页

作者： Fida, Hasan M. Kumada, Yoichi Terashima, Masaaki Katsuda, Tomohisa Katoh, Shigeo Department of Molecular Science and Material Engineering Graduate School of Science and Technology Faculty of Engineering Kobe Japan Department of Chemistry and Materials Technology Kyoto Institute of Technology Kyoto Japan Department of Biosphere Sciences School of Human Science Kobe College Nishinomiya Japan Department of Chemical Engineering Hanyang University 1271 Sa-3-dong Sangrok-gu Ansan 426-791 Korea Republic of Department of Process Engineering and Applied Science Food Science and Technology Program Dalhousie University 1360 Barrington Street Halifax NS B3J 2X4 Canada

It is common for small tandem peptide multimer genes to be indirectly inserted into expression vectors and fused with a protein tag. In this study, a multimer of the tandem angiotensin I-converting enzyme inhibitory peptide (ACE-IP) gene was directly transferred to a commercially available vector and the designed gene was expressed as a repeated peptide in Escherichia coli BL21(DE3)pLysS. The process further developed in our study was the construction of six-repeated ACE-IP synthetic genes and their direct insertion. Protein expression in inclusion bodies was confirmed by SDS-PAGE and Western blot. Acid hydrolysis of inclusion bodies produced single-unit peptides through cleavage of the aspartyl-prolyl bonds. This cleaved recombinant peptide (rACE-IP) was purified using immuno-affinity chromatography followed by reversed phase-HPLC. 105-115 mg of the lyophilized recombinant peptide was obtained from 1 L E. coli culture. In vitro biological activity of rACE-IP was indistinguishable from that of the natural peptide produced by hydrolysis in artificial gastric juice or by acidic hydrolysis. The rACE-IP prepared by recombinant DNA technology and solid-phase synthesis methods showed a similar IC50. This strategy could be used for the expression of important peptides, which have N-terminal proline (P) and C-terminal aspartic acid residues (D) for commercial applications, e.g. functional foods and drinks. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

关键词： Peptides

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Binary data transmission performance of sub-20 nm indium antimonide nanowires

Binary data transmission performance of sub-20 nm indium ant...

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2011 MRS Spring Meeting

作者： Guvenc, Ali Bilge Penchev, Miroslav Zhong, Jiebin Ozkan, Cengiz Ozkan, Mihrimah Department of Electrical Engineering University of California-Riverside Riverside CA 92521 United States Department of Mechanical Engineering University of California-Riverside Riverside CA 92521 United States Material Science and Engineering Program University of California-Riverside Riverside CA 92521 United States

ISBN: (纸本)9781618395535

We investigated the data transmission performance of indium antimonide (InSb) nanowires (NWs) synthesized on InSb (100) substrate using chemical vapor deposition (CVD) having diameters of 20 nm and below. The results indicate that the data transmission performance of NWs suffer from low mobility values on the order of 10-to-15 cm2V-1s-1 because of the scattering due to their small diameters, crystal defects and oxidation occurs during growth and cooling. The 20 nm NWs can sustain data rates up to 5 mega bits per second (Mbps) without any impedance matching and de-embedding of the parasitic parameters coming from the measurement system with a bit error rate (BER) level of 10-8. The data rate is directly proportional to the diameter of the NWs. © 2011 materials Research Society.

关键词： Nanowires

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Data transmission performance of few-layer graphene ribbons

Data transmission performance of few-layer graphene ribbons

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2011 MRS Spring Meeting

作者： Guvenc, Ali Bilge Lin, Jian Penchev, Miroslav Ozkan, Cengiz Ozkan, Mihrimah Department of Electrical Engineering University of California-Riverside Riverside CA 92521 United States Department of Mechanical Engineering University of California-Riverside Riverside CA 92521 United States Material Science and Engineering Program University of California-Riverside Riverside CA 92521 United States

ISBN: (纸本)9781605113210

We investigated the electrical characteristics and digital data transmission performance few-layer graphene ribbons grown by chemical vapor deposition. Graphene ribbons having a mobility of 2,180 cm2V -1s-1 can sustain data rates up to 50 megabits per second at 1.5 μm length, thus the bandwidth is inversely proportional to resistance caused by defects in the graphene layers. Improving the graphene mobility to highest measured values (∼200,000 cm2V-1s -1) and using structures with multiple coplanar transmission lines in parallel could carry the bandwidth beyond the gigabits per second level. © 2011 materials Research Society.

关键词： Bandwidth

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