PL
 |
EN
Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 9

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets
100%
Yang Z. , Sun X. , Chen L. , Su B. , Li K.
|
2017
|
nr 6
2
Content available Design and analysis of interior composite-rotor bearingless permanent magnet synchronous motors with two layer permanent magnets
100%
Sun X. , Su B. , Chen L. , Yang Z. , Li K.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2017
|
tom Vol. 65, nr 6
833--843
EN
In this paper, a new type of interior composite-rotor bearingless permanent magnet synchronous motors (BPMSMs) with two layer permanent magnets (PMs) is proposed. In order to reduce the torque ripple of this kind of motors, the sizes of PMs are optimized. Moreover, the magnetic field analysis of the interior composite-rotor BPMSM with two layer PMs is carried out by the finite element method (FEM). The corresponding static electronic magnetic characteristics at no load, including magnetic field, PM flux linkage and inductance, are studied in detail. In addition, electromagnetic torque characteristics and suspension force characteristics are also investigated thoroughly. The results of the analysis and simulation lay a significant foundation for further research on the interior composite-rotor BPMSMs with two layer PMs.
3
Content available Digital control system design for bearingless permanent magnet synchronous motors
86%
Sun X. , Shi Z. , Yang Z. , Wang S. , Su B. , Chen L. , Li K.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2018
|
tom Vol. 66, nr 5
687--698
EN
This study investigates a digital control system which is used in bearingless permanent magnet synchronous motors (BPMSMs). Compared with traditional permanent magnet synchronous motors, a BPMSM is characterized by higher speed and no mechanic friction. Therefore, the application value of the latter to the special area is higher than that of the former. An analysis from previous work on the BPMSM had proved its feasibility, and some performances such as suspension force, inductance and so on were also investigated. Based on this analysis, this study focuses on solving control problems in practical applications by designing a control system. The control system design includes overall schematic, hardware and software designs. Main software systems, including the force/current transform module and closed loop control module for radial displacement, are analyzed. Interface circuit for radial displacement, current feedback circuit and dead zone protection circuit are designed for the hardware system. Finally, several performance experiments have been conducted to verify the effectiveness of the designed digital control system. Experiment results indicate that the rotor has unique characteristics, such as stable suspension performance, good start-of-suspension performance, and rapid anti-disturbance features.
4
Content available Digital control system design for bearingless permanent magnet synchronous motors
86%
Chen L. , Sun X. , Wang S. , Shi Z. , Yang Z. , Su B. , Li K.
|
2018
|
nr 5
5
Comparison of the ossification centre images between standard computed tomography and micro-computed tomography
72%
Wang W. , Wang X. , Ren X. , Chen L. , Li Z. , Li X. , Zhang P. , Gao J. , Su B. , Zhang S.
Folia Morphologica
|
2020
|
tom 79
|
nr 1
EN
Background: Based on standard computed tomography (CT) and micro-CT scan axis images, our study aims to analyse the incidence of variation of non-fusion ossification centre in the base of the odontoid and its anatomical structure characteristics, to compare ossification centre images and analyse the possible features of the ossification centre that can influence adult odontoid fractures. Materials and methods: Fifty cases were selected for standard cervical CT of the normal axis bone (second cervical) anatomy to calculate the incidence of variation of the non-fusion ossification centre in the base of the odontoid and the indexes of associated anatomical structure. In addition, five dry bone samples with the odontoid were chosen for micro-CT to analyse the clear anatomic structure of the trabecular bone in the ossification centre. Results: Incidence of variation of non-fusion ossification centre in the base of the odontoid was 28%. In the non-ossification group, the mean sagittal diameter of the base of odontoid (SDBO, mm) was 7.64 ± 1.29 mm, the mean transverse diameter of the base of odontoid (TDBO, mm) was 7.14 ± 1.55 mm, and the SDBO:TDBO ratio was 1.1 ± 0.22. In the ossification group, the mean SDBO was 7.7 ± 1.15 mm, the mean TDBO was 7.38 ± 1.32 mm, and the SDBO:TDBO ratio was 1.07 ± 0.21. There was no significant difference in the associated indexes between the ossification and non-ossification groups (p > 0.05). Micro-CT revealed the micro-structure of trabecular bone in the ossification centre and the close relationship between the trabecular bone and the odontoid. One existing non-ossification centre in the base of the odontoid was found in the five odontoid images. The trabecular bone indexes chosen in the target area of the ossification centre were weaker than those in other areas. Conclusions: The variation rate of the non-fusion ossification centre in the base of the odontoid is relatively high and may be an important factor in the aetiology of type II and III odontoid fractures. (Folia Morphol 2020; 79, 1: 141–147)
6
Content available remote Highly efficient organic ultraviolet photodetectors based on excellent Cu(I) complexes
72%
Liu C. B. , Su B. , Liu M. , Zhang X. X. , Wang L. , Zhang S. , Che G. B. , Xu Z. L.
Opto-Electronics Review
|
2013
|
tom Vol. 21, No. 3
288-292
EN
We demonstrate high response organic ultraviolet photodetectors using 4,4',4''-tris[3-methyl-pheny(phenyl)amino]tri-phenylamine (m-MTDATA) and two novel Cu(I) complexes, [Cu(DPEphos)(PyPhen)]BF (CuDP)(DPEphos = Bis [2-(diphenylphosphino)phenyl]ether, PyPhen = pyrazino[2,3-f][1,10]phenanthroline) and [Cu(DPEbenz)(PyPhen)] BF₄(CuBP) (DPEbenz = 1,2-bis(diphenylphosphino)benzene) to act as the electron donor and acceptor, respectively. Strong photoluminescence quenching of m-MTDATA by Cu(I) complexes is observed manifesting the efficient photoinduced charge transfer that occurs between m-MTDATA and Cu(I) complexes. The optimized photodetector based on CuBP exhibits a maxi-mum response of 276 mA/W at -12 V under an illumination of 365 nm UV light irradiation with an intensity of 1.75 mW/cm². The high response is attributed to feasible energy level match, efficient electron transfer from m-MTDATA to CuBP and skillful device design. More detailed working mechanism of harvesting high performance is also discussed.
7
Mislocalization of CDK11/PITSLRE, a regulator of the G2/M phase of the cell cycle, in Alzheimer disease
58%
Bajic V. , Su B. , Lee H.-G. , Kudo W. , Siedlak S. , Zivkovic L. , Spremo-Potparevic B. , Djelic N. , Milicevic Z. , Singh A. , Fahmy L. , Wang X. , Smith M. , Zhu X.
Cellular and Molecular Biology Letters
|
2011
|
tom 16
|
nr 3
EN
Post-mitotic neurons are typically terminally differentiated and in a quiescent status. However, in Alzheimer disease (AD), many neurons display ectopic re-expression of cell cycle-related proteins. Cyclin-dependent kinase 11 (CDK11) mRNA produces a 110-kDa protein (CDK11p110) throughout the cell cycle, a 58-kDa protein (CDK11p58) that is specifically translated from an internal ribosome entry site and expressed only in the G2/M phase of the cell cycle, and a 46-kDa protein (CDK11p46) that is considered to be apoptosis specific. CDK11 is required for sister chromatid cohesion and the completion of mitosis. In this study, we found that the expression patterns of CDK11 vary such that cytoplasmic CDK11 is increased in AD cellular processes, compared to a pronounced nuclear expression pattern in most controls. We also investigated the effect of amyloid precursor protein (APP) on CDK11 expression in vitro by using M17 cells overexpressing wild-type APP and APP Swedish mutant phenotype and found increased CDK11 expression compared to empty vector. In addition, amyloid-β25–35 resulted in increased CDK11 in M17 cells. These data suggest that CDK11 may play a vital role in cell cycle re-entry in AD neurons in an APP-dependent manner, thus presenting an intriguing novel function of the APP signaling pathway in AD.
8
Construction and activity analyses of single functional mouse peroxiredoxin 6 (Prdx6)
58%
Wang L.-L. , Lu S.-Y. , Hu P. , Fu B.-Q. , Li Y.-S. , Zhai F.-F. , Ju D.-D. , Zhang S.-J. , Su B. , Zhou Y. , Liu Z.-S. , Ren H.-L.
Journal of Veterinary Research
|
2019
|
tom 63
|
nr 1
9
Features and clinical significance of the ossification centres in the odontoid process based on micro-computed tomography
58%
Wang W. , Wang X. , Ren X. , Li Z. , Su B. , Xu Y. , Xu X. , Lv D. , Liu W. , Zhang S. , Chen L. , Li X.
Folia Morphologica
|
2020
|
tom 79
|
nr 4
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.