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Wyświetlanie 1-15 z 22
Tytuł:
The effects of cavity geometry on an aspirated compressor cascade
Autorzy:
Guo, S.
Lu, H.-W.
Liu, J.
Wu, C.-J.
Powiązania:
https://bibliotekanauki.pl/articles/280871.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
highly loaded compressor cascade
boundary layer suction
suction flow distribution
off-take cavity
Opis:
The impact of the bleed off-take cavity within aspirated blades on the aerodynamic perfor- mance of a highly loaded compressor cascade was explored. Three-dimensional Navier-Stokes simulations were conducted in rectangular compressor cascades after validation against expe- rimental results were done. Five different off-take configurations with varying suction loca- tion were numerically evaluated. The results show that the regularities of the suction flow distribution on the suction slot inlet greatly influence the benefits of boundary layer suction. The distribution style greatly depends not only on the flow condition of the blade passage, but also on the realization of the suction process and the geometry of the cavity inside the aspirated blade. The low kinetic fluid in the endwall region compared with that around the midspan is usually prone to be sucked into the suction slot. The distribution of the suc- tion mass flow along the spanwise direction would be symmetrical if the suction position is properly selected and the inside off-take cavity is well designed, even though the bleeding system has been simplified to be asymmetrical as employed in the present document.
Źródło:
Journal of Theoretical and Applied Mechanics; 2014, 52, 1; 117-128
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Current Landscape of Management of Low Grade Mucinous Appendiceal Adenocarcinoma
Autorzy:
Lu, Pamela W.
Fields, Adam C.
Melnitchouk, Nelya
Powiązania:
https://bibliotekanauki.pl/articles/1623478.pdf
Data publikacji:
2020
Wydawca:
Krakowska Akademia im. Andrzeja Frycza Modrzewskiego
Źródło:
Państwo i Społeczeństwo; 2020, 4; 11-14
1643-8299
2451-0858
Pojawia się w:
Państwo i Społeczeństwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on striking ship with loading impact on the performance of the double hull oil tanker collision
Autorzy:
Wu, W.
Yang, Y.
Zhang, J.
Lu, J.
Powiązania:
https://bibliotekanauki.pl/articles/258890.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship collision
fluid-structure interaction
impact parameters
numerical simulation
Opis:
Due to the great danger of the collision of oil tankers, lots of research on the collision of oil tankers has been carried out. But, at present, the research on the collision of oil tankers mainly focuses on the loading condition of the struck ship, ignores the impact on the loading condition of the striking ship. However, during the actual oil tanker collision, the striking ship is generally in the state of loading. Therefore, it is necessary to carry out the analysis of the impact of the loading condition of the striking ship on the collision damage of the oil tanker. In this paper, the effect of striking ship with loading on the impact performance of the side structure during the collision of the cargo double hull oil tanker has been investigated. The ship collision model was established by using the finite element software ANSYS/ LS-DYNA which is based on 7000 tons of double hull oil tankers. Based on the analysis of the collision force, impact of striking speed changes, impact of striking deep changes and structural energy absorption during the collision process, the influence of the striking ship with loading on the damage mechanism and the impact performance of the double shell oil ship side structure was expounded. The results show that the influence of the striking ship with loading can be great to the damage to side hull during the research of the collision performance of the oil tanker.
Źródło:
Polish Maritime Research; 2018, S 2; 42-48
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on pre-concentration efficiency of wolframite from tungsten ore using gravity and magnetic separations
Autorzy:
Lu, D.
Wang, Y.
Jiang, T.
Sun, W.
Hu, Y.
Powiązania:
https://bibliotekanauki.pl/articles/109597.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
tungsten ore
pre-concentration
separation efficiency
gravity separation
magnetic separation
Opis:
Pre-concentration is effectively applied in recovering wolframite from tungsten ore, due to its benefits of further upgrading tungsten ore and improving separation efficiency. The most important pre-concentration techniques for tungsten ore include gravity separation and magnetic separation, based on the fact that there are appreciable differences, between the desired wolframite and the gangue minerals, in density and magnetic susceptibility. This study investigated the separation efficiency of gravity pre-concentration (Falcon Concentrator) and high-gradient magnetic pre-concentration (SLon VPHGMS) for the beneficiation of a Canada tungsten ore. It is a low-grade type of ore with high silica and arsenic content, and an average content of WO3 is about 0.45%. The optimum conditions for different operational parameters of two pre-concentration separators were studied on this low-grade material. The results presented in this paper suggested that although both pre-concentration techniques were effective for producing pre-concentrates containing high WO3, magnetic pre-concentration showed significantly better separation efficiency. Over 90% of the feed was rejected as the final tailings, meanwhile, over 85% of arsenic minerals were removed with tailings, while the WO3 loss was less than 15%.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 2; 718-728
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solution of some problems of single-scale wavelet transform processor using a magnetostatic surface wave device
Autorzy:
Lu, W.
Kuang, L.
Lü, X.
Zhu, C.
Zhang, T.
Zhang, J.
Powiązania:
https://bibliotekanauki.pl/articles/221174.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wavelet transform processor
magnetostatic surface wave (MSSW)
interdigital transducer
direct coupling
insertion loss
Opis:
In this paper, we investigate the implementation schemes of a single-scale wavelet transform processor using magnetostatic surface wave (MSSW) devices. There are three implementation schemes: the interdigital transducer, the meander line transducer and the grating transducer. Because the interdigital transducer has excellent properties, namely, good frequency characteristic and low insertion loss, we use the interdigital transducer as the implementation scheme of a single-scale wavelet transform processor using MSSW device. In the paper, we also present the solutions to the three key problems: the direct coupling between the input transducer and the output transducer, the insertion loss, and the loss characteristics of the gyromagnetic film having an influence on the wavelet transform processor. There are two methods of reducing the direct coupling between the input transducer and the output transducer: increasing the distance between the input transducer and the output transducer, and placing a metal "wall" between the input transducer and the output transducer. There also are two methods of reducing the insertion loss of a single-scale wavelet transform processor using a MSSW device for scale: the appropriate thickness of the yttrium iron garnet (YIG) film and the uniform magnetic field. The smaller the ferromagnetic resonance linewidth of the gyromagnetic film, the smaller the magnetostatic wave propagation loss.
Źródło:
Metrology and Measurement Systems; 2012, 19, 4; 685-692
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Review and perspective of high-k dielectrics on silicon
Autorzy:
Hall, S.
Buiu, O.
Mitrovic, I. Z.
Lu, Y.
Davey, W. M.
Powiązania:
https://bibliotekanauki.pl/articles/309000.pdf
Data publikacji:
2007
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
high-k dielectrics
dielectric constant
hafnia
interfacial layer
aluminates
silicates
Opis:
The paper reviews recent work in the area of high-k dielectrics for application as the gate oxide in advanced MOSFETs. Following a review of relevant dielectric physics, we discuss challenges and issues relating to characterization of the dielectrics, which are compounded by electron trapping phenomena in the microsecond regime. Nearly all practical methods of preparation result in a thin interfacial layer generally of the form SiOx or a mixed oxide between Si and the high-k so that the extraction of the dielectric constant is complicated and values must be qualified by error analysis. The discussion is initially focussed on HfO2 but recognizing the propensity for crystallization of that material at modest temperatures, we discuss and review also, hafnia silicates and aluminates which have the potential for integration into a full CMOS process. The paper is concluded with a perspective on material contenders for the "end of road map" at the 22 nm node.
Źródło:
Journal of Telecommunications and Information Technology; 2007, 2; 33-43
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse flotation of ultrafine magnetic concentrate by using mixed anionic/cationic collectors
Autorzy:
Lu, D.
Hu, Y.
Li, Y.
Jiang, T.
Sun, W.
Wang, Y.
Powiązania:
https://bibliotekanauki.pl/articles/110550.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
ultrafine magnetite
collector mixture
reverse flotation
closed flotation
Opis:
Compared to reverse cationic flotation, the advantages of reverse anionic flotation include relatively lower sensitivity to slimes and lower reagent cost. Besides, anionic collectors were found to have excellent capability of selectively separating an ultrafine magnetite ore. Addition of a small amount of cationic collector into the anionic collector as the collector mixture can improve the metallurgical results of removing silicates in reverse flotation. In this paper, NaOL and DDA were used for reverse flotation of the ultrafine magnetic concentrate. The separation performance of the collector mixture was investigated at different ratios of NaOL and DDA. The results showed that a better separation performance was obtained for the collector mixture than for NaOL alone. There was an optimal molar ratio between NaOL and DDA equal to 10:1. In the flotation system with the presence of the collector mixture, the good selectivity was found when starch was used as a depressor for magnetite and CaO was used as an activator for quartz. The influences of starch and CaO dosages on the separation performance of magnetite, quartz and chlorite had been investigated through micro-flotation tests. The infrared spectral analysis showed stretching vibration peaks of chemical adsorption of the collector mixture on the magnetite surface. The peaks were not present when starch was used as the depressor for magnetite. The closed flotation tests on the magnetic concentrate with the particle size of -25 μm were performed in the laboratory. The Fe concentrate assaying 64.52 % was obtained with Fe recovery of 80.66%, for the Fe content of feed equal to 52.98%.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 2; 724-736
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase features of several typical blood cells and their identification without unwrapping
Autorzy:
Wang, Y.
Chen, Y
Lü, C.
Shang, X.
Xu, Y.
Wu, H.
Zhu, X.
Jin, W.
Powiązania:
https://bibliotekanauki.pl/articles/173588.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
digital holographic phase
nucleated cell
phase model
wrapped phase features
identification
Opis:
The digital holographic phase microscopy (DHPM) technique which has been proposed for cellular morphology and dynamic analysis yielded highly desirable results. However, for nucleated cells (especially white blood cells (WBCs)), their submicroscopic structure has not yet been deconstructed through a phase unwrapping method due to the heterogeneity of an internal phase. By analyzing the phase heterogeneity of subclasses of WBCs, the typical phase models of them are built first in this paper; using the simulation method, the wrapped phase distributions of these models are obtained. However, by optimizing the wrapped phase maps and analyzing the relationships between them and typical blood cells, their features are selected and extracted. Then the models built are sorted out from each other successfully without unwrapping via analyzing these extracted features, which provides a valuable approach and technological base for the classification and identification of blood cells.
Źródło:
Optica Applicata; 2013, 43, 3; 505-514
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Scintillation Properties of $Bi_{4}(Ge_{x}S_{1-x})_{3}O_{12}$ Single Crystal
Autorzy:
Xiao, X.
Xu, J.
Lu, B.
Cai, W.
Zhang, Y.
Shen, H.
Yang, B.
Xiang, W.
Powiązania:
https://bibliotekanauki.pl/articles/1399369.pdf
Data publikacji:
2015-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
61.05.C-
78.20.Ci
78.70.Ps
Opis:
The solid solution crystals, $Bi_{4}(Ge_{x}Si_{1-x})_{3}O_{12}$ (BGSO) with x=0, 0.05, and 0.15, have been grown by the modified vertical Bridgman method. The as-grown crystals show 80% of transmittance with an absorption edge of 285 nm. The relative light yields of BGSO crystals are found to be 7.2%, 6.3%, and 4.2% of CsI(Tl) crystal for x=0, 0.05, and 0.15, respectively. The energy resolutions of these crystals are 18.9%, 21.3%, and 24.7%, respectively, with PMT for 662 keV gamma rays at room temperature when exposed to $\text{}^{137}Cs$ γ -ray. The scintillation performance of BGSO crystals clearly deteriorates with the increase of Ge content. However, the appropriate number of germanium ions doped to BSO crystal can improve its crystallization behavior and effectively restrain component segregation. It is expected that large size crystals of BGSO will be grown and applied to the dual readout calorimeter in the nearest future.
Źródło:
Acta Physica Polonica A; 2015, 127, 3; 854-858
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Study of the Effect of Furrows on Biosonar Beamforming in Aselliscus Stoliczkanus Bat
Autorzy:
He, W.
Feng, J.
Gao, L.
Zhang, Z.
Lu, H.
Powiązania:
https://bibliotekanauki.pl/articles/176802.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aselliscus Stoliczkanus bat
furrows
frequency-selective characteristics
finite element method
beam pattern
Opis:
The Aselliscus Stoliczkanus bat, studied here, has intricately shaped structures surrounding the nostrils. These structures are hypothesised to have influence on animals’ acoustic radiation patterns. Using micro-tomography scanning technique, a 3D digital model of the noseleaf is reconstructed and biosonar beam pattern is analysed using a finite element method based on the 3D noseleaf model. The present research focuses on the conspicuous furrows in noseleaf, and our analysis allows to conclude the followings: a) structural details in noseleaf of Aselliscus Stoliczkanus bat can produce acoustic effects even if it is not adjacent to the nostrils, b) the furrows possess frequency-selective characteristics, c) the furrows have the function to manipulate the direction and width of the outgoing ultrasound wave.
Źródło:
Archives of Acoustics; 2017, 42, 3; 395-399
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Spectroscopy of Bearing Steel
Spektroskopia mechaniczna stali łożyskowej
Autorzy:
Lu, X.
Li, W.
Jin, M.
Min, N.
Jin, X.
Powiązania:
https://bibliotekanauki.pl/articles/351791.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
bearing steel
twin martensite
mechanical spectroscopy
internal friction
Snoek-Köster peak
stal łożyskowa
bliźniacza struktura martenzytu
atomy węgla
spektroskopia mechaniczna
tarcie wewnętrzne
niskotemperaturowe zbocze szczytu Snoek-Köstera
Opis:
This study presents mechanical spectroscopy of bearing steel subjected to different heat treatments. A non-thermally activated maximum, P1, was found at 130°C, in quenched martensitic samples, which were austenitized at 1050°C and 860°C, and presented twin martensite microstructures. It is suggested that the mechanism of the P1 maximum, observed on the low-temperature side of Snoek-Köster peak, is related to the change of defect configurations in twinned martensite assisted with high mobility of the solute carbon atoms under an external harmonic stress field applied during mechanical loss measurements.
W pracy przedstawiono wyniki badań spektroskopii mechanicznej stali łożyskowej poddanej różnej obróbce cieplnej. W hartowanych martenzytycznych próbkach, które były austenityzowane w 1050°C i 860°C, i posiadały bliźniaczą mikrostrukturę martenzytu, występuje nietermicznie aktywowane maksimum P1 przy 130°C. Sugeruje się, że mechanizm maksimum P1, które występuje na niskotemperaturowym zboczu piku Snoek-Köstera, związane jest ze zmianą konfiguracji defektów w bliźniaczym martenzycie, przy wysokiej ruchliwości atomów węgla. Maksimum P1 ujawnia się pod wpływem działania harmonicznie zmiennego zewnętrznego pola naprężeń przyłożonego do próbki w trakcie badań metodą spektroskopii mechanicznej.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 3A; 2085-2091
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnolol inhibits Streptococcus suis-induced inflammation and ROS formation via TLR2/MAPK/NF-κB signaling in RAW264.7 cells
Autorzy:
Wang, J.
Sun, Y.
Zhang, L.
Xu, W.
You, J.
Lu, H.
Song, Y.
Wei, J.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/2087779.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnolol
Streptococcus suis
Toll-like receptor2
mitogen-activated protein kinase
nuclear factor Kappa B
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 111-118
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isolation of biosynthesis related transcripts of 2,3,5,4-tetrahydroxy stilbene-2-O-beta-D-glucoside from Fallopia multiflora by suppression subtractive hybridization
Autorzy:
Zhao, W.
Sheng, S.
Liu, Z.
Lu, Di.
Zhu, K.
Li, X.
Zhao, S.
Yao, Y.
Powiązania:
https://bibliotekanauki.pl/articles/58239.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
isolation
biosynthesis
transcriptome
2,3,5,4'-tetrahydroxy stilbene-2-O-beta-D-glucoside
Fallopia multiflora
hybridization
gene expression
medicinal plant
Chinese herb
Opis:
2,3,5,4'-tetrahydroxy stilbene-2-O-ß-D-glucoside (THSG) exerts multiple pharmacodynamic actions, found in Fallopia multiflora, but the biosynthesis pathway of THSG is still unclear. To clear this ambiguity, we constructed suppression subtractive hybridization (SSH) libraries to screen the genes involved in THSG biosynthesis from two F. multiflora varieties, which vary significantly in THSG content. Twelve non-redundant differentially expressed sequence tags were obtained and the full lengths of 4 unreported fragments were amplified by rapid amplification of cDNA ends. We totally got 7 fulllength transcripts, and all of them were aligned to the transcriptome and digital gene expression tag profiling database of four F. multiflora tissues (root, stem and leaf from Deqing F. multiflora and another root from Chongqing F. multiflora; data unpublished) using local BLAST. The results showed that there was a significant, organ specific difference in the expression of fragments and full-length sequences. All the sequences were annotated by aligning to nucleotide and protein databases. Kyoto Encyclopedia of Genes and Genomes pathway analysis indicated that THSG biosynthesis was correlated with multiple life activities.
Źródło:
Acta Societatis Botanicorum Poloniae; 2014, 83, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incorporating Fault Tolerance into Component-based Architectures for Embedded Systems
Autorzy:
Lu, S.
Halang, W. A.
Powiązania:
https://bibliotekanauki.pl/articles/384865.pdf
Data publikacji:
2009
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
software engineering
software architecture
fault tolerance
component technique
Opis:
Component-based software architecture is presented to support the process of designing and developing fault-tolerant computerised control systems. To this end, we combine an idealised fault-tolerant component, the C2 architecture style and protective wrappers, and embed fault tolerance techniques into component definitions. The resulting architecture is described by normal- and abnormal-activity components aiming to support a wide range of fault tolerance features. Use of this architecture enables to reason about system dependability already from the earliest development stages on, and to customise fault tolerance strategies according to application characteristics.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 1; 46-51
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
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