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Wyszukujesz frazę "Yuan, L." wg kryterium: Autor


Tytuł:
Multiple-instance learning with pairwise instance similarity
Autorzy:
Yuan, L.
Liu, J.
Tang, X.
Powiązania:
https://bibliotekanauki.pl/articles/330821.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
multiple instance learning
instance selection
similarity
support vector machine (SVM)
uczenie maszynowe
podobieństwo
metoda wektorów wspomagających
Opis:
Multiple-Instance Learning (MIL) has attracted much attention of the machine learning community in recent years and many real-world applications have been successfully formulated as MIL problems. Over the past few years, several Instance Selection-based MIL (ISMIL) algorithms have been presented by using the concept of the embedding space. Although they delivered very promising performance, they often require long computation times for instance selection, leading to a low efficiency of the whole learning process. In this paper, we propose a simple and efficient ISMIL algorithm based on the similarity of pairwise instances within a bag. The basic idea is selecting from every training bag a pair of the most similar instances as instance prototypes and then mapping training bags into the embedding space that is constructed from all the instance prototypes. Thus, the MIL problem can be solved with the standard supervised learning techniques, such as support vector machines. Experiments show that the proposed algorithm is more efficient than its competitors and highly comparable with them in terms of classification accuracy. Moreover, the testing of noise sensitivity demonstrates that our MIL algorithm is very robust to labeling noise.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2014, 24, 3; 567-577
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study on fracturing coal seams using CaO demolition materials to improve permeability
Autorzy:
Tang, Y.
Yuan, L.
Xue, J
Duan, C.
Powiązania:
https://bibliotekanauki.pl/articles/92132.pdf
Data publikacji:
2017
Wydawca:
Główny Instytut Górnictwa
Tematy:
soundless chemical demolition
coal seam
gas drainage
CaO
pokład węgla
odmetanowanie
Opis:
Currently, methane gas disasters in underground coal mines are a major problem which seriously threatens safe mining. This study employed soundless chemical demolition for fracturing coal seams with low permeability. Additionally, the fracturing theory and failure mechanisms of soundless chemical demolition agents were investigated. Materials such as CaO, naphthalene-based water reducer, sodium gluconate and silicate cement were used to prepare the novel soundless chemical demolition agent, whose optimum proportion was discovered to be 90:3:5:7 by carrying out orthogonal experiments. The innovative demolition agent cracked briquettes and the maximum width of cracks reached 16.33 mm, showing significant potential for improving the permeability of coal seams.
Źródło:
Journal of Sustainable Mining; 2017, 16, 2; 47-54
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Barycenter reflected equatorial Pacific sea level structure evolution and its indication of ENSO events
Autorzy:
Luo, W.
Yi, L.
Yu, Z.
Sun, H.
Yuan, L.
Powiązania:
https://bibliotekanauki.pl/articles/49107.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
sea level
El Nino-Southern Oscillation
Equatorial Pacific
satellite altimetry
principal tensor analysis
barycenter method
Źródło:
Oceanologia; 2015, 57, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of heat stress on leaf morphology and nitrogen–carbohydrate metabolisms in two wucai (Brassica campestris L.) genotypes
Autorzy:
Yuan, L.
Tang, L.
Zhu, S.
Hou, J.
Chen, G.
Liu, F.
Liu, S.
Wang, C.
Powiązania:
https://bibliotekanauki.pl/articles/56883.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Heat stress is a major environmental stress that limits plant growth and yield worldwide. The present study was carried out to explore the physiological mechanism of heat tolerant to provide the theoretical basis for heat-tolerant breeding. The changes of leaf morphology, anatomy, nitrogen assimilation, and carbohydrate metabolism in two wucai genotypes (WS-1, heat tolerant; WS-6, heat sensitive) grown under heat stress (40°C/30°C) for 7 days were investigated. Our results showed that heat stress hampered the plant growth and biomass accumulation in certain extent in WS-1 and WS-6. However, the inhibition extent of WS-1 was significantly smaller than WS-6. Thickness of leaf lamina, upper epidermis, and palisade mesophyll were increased by heat in WS-1, which might be contributed to the higher assimilation of photosynthates. During nitrogen assimilation, WS-1 possessed the higher nitrogen-related metabolic enzyme activities, including nitrate reductase (NR), glutamine synthetase (GS), glutamate synthase (GOGAT), and glutamate dehydrogenase (GDH), which were reflected by higher photosynthetic nitrogen-use efficiency (PNUE) with respect to WS-6. The total amino acids level had no influence in WS-1, whereas it was reduced in WS-6 by heat. And the proline contents of both wucai genotypes were all increased to respond the heat stress. Additionally, among all treatments, the total soluble sugar content of WS-1 by heat got the highest level, including higher contents of sucrose, fructose, and starch than those of WS-6. Moreover, the metabolism efficiency of sucrose to starch in WS-1 was greater than WS-6 under heat stress, proved by higher activities of sucrose phosphate synthase (SPS), sucrose synthase (SuSy), acid invertase (AI), and amylase. These results demonstrated that leaf anatomical alterations resulted in higher nitrogen and carbon assimilation in heat-tolerant genotype WS-1, which exhibited a greater performance to resist heat stress.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation gob gas field of the roof tunnel drainage method
Symulacja numeryczna ujęcia gazu ze zrobów za pomocą chodnika odgazowującego stropowego
Autorzy:
Qin, R. X.
Teng, L.
Yuan, S.
Shi, L.
Powiązania:
https://bibliotekanauki.pl/articles/348605.pdf
Data publikacji:
2012
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
otwory wiertnicze
chodnik stropowy
odprowadzanie gazu
zroby
downward borehole
roof tunnel
gas drainage
gob
Opis:
Roof tunnel drainage is one of the efficient methods of integrated coal exploitation and gas extraction. In order to improve drainage results, a gob gas field of roof tunnel drainage is simulated. As a result of the coal seam occurrence change, the method of downward boreholes from roof tunnel as the amend method is used to increase gas concentration and the quantity of the gas flow. So the gob gas field is compared before and after using the downward boreholes from the roof tunnel. The results show that the range 27m away from the coal face is the gas drainage short area of the roof tunnel method, but the downward boreholes cover it. The downward boreholes acts like a barrier, which prevent gas from flowing to the upper corner in the gob. The gas content in the area from the coalface to 140m on the upper side of the gob is decreased by the roof tunnel with downward boreholes, and this accompanying measure reduces the gas value of upper corner not over the allowable gas limitation.
Odprowadzanie gazu przez chodnik stropowy jest jedną z najbardziej skutecznych metod odmetanowania przy wydobyciu węgla kamiennego. Dla lepszego odprowadzania gazu wykonano symulację gazu ze zrobów przez chodnik stropowy. Zastosowano metodę wiercenia otworów z chodnika stropowego do pokładu węgla w celu zwiększenia stężenia i objętości przepływającego gazu. Porównano zawartości gazu w zrobach przed i po zastosowaniu otworów wiertniczych z chodnika stropowego. Wyniki pokazują, że odległość 27 m od czoła ściany węglowej jest odległością, na której gaz nie może być odprowadzany chodnikiem stropowym jednak dodatkowe otwory wiertnicze zwiększają ujęcie gazu. Otwory tworzą barierę, która zapobiega uchodzeniu gazu do górnych krawędzi zrobów. Zawartość gazu w odległości od czoła ściany do 140 m w górnej części zrobów zmniejsza się dzięki zastosowaniu chodnika z otworami nawierconymi w dół, co przyczynia się do obniżenia stężenia gazu w wyrobisku do wartości poniżej dopuszczalnych.
Źródło:
AGH Journal of Mining and Geoengineering; 2012, 36, 3; 283-290
1732-6702
Pojawia się w:
AGH Journal of Mining and Geoengineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Invariants for Time-Dependent Harmonic Oscillators from the Real Representation of Solution
Autorzy:
Liang, M.-L.
Zhang, Z.-G.
Yuan, B.
Powiązania:
https://bibliotekanauki.pl/articles/2037140.pdf
Data publikacji:
2004-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
45.20.Jj
03.65.-w
Opis:
The invariants for the time-dependent one-dimensional harmonic oscillator and the time-dependent two-dimensional harmonic oscillator in a static magnetic field are derived from the real representation of the exact solution to the equation of motion. Mathematically, the orthogonal functions invariant is the angular momentum of an isotropic time-dependent two-dimensional harmonic oscillator. Based on the invariants obtained here, the wave function for time-dependent two-dimensional harmonic oscillator in a static magnetic field in cylindrical coordinate is simply derived and the dynamical and geometrical phases are easily got by expressing the wave function as the superpositions of the wave functions of time-dependent two-dimensional harmonic oscillator in rectangular coordinate. For the driven system, the driving induced dynamical phase and the geometrical phase are respectively associated with the classical Hamiltonian and de Broglie wave of the center motion of the wave function.
Źródło:
Acta Physica Polonica A; 2004, 105, 3; 253-262
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scanning Probe Microscopy and Spectroscopy of High Temperature Superconductors
Autorzy:
de Lozanne, A. L.
Edwards, H. L.
Yuan, C.
Markert, J. T.
Powiązania:
https://bibliotekanauki.pl/articles/1968757.pdf
Data publikacji:
1998-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.16.Ch
74.50.+r
07.79.Cz
07.79.Pk
74.72.Bk
74.72.Hs
Opis:
The authors review recent studies of high temperature superconductors conducted with scanning tunneling and magnetic force microscopes. Emphasis is placed on the importance of surface and probe characterization, both of which are likely to affect the detailed nature of the observations.
Źródło:
Acta Physica Polonica A; 1998, 93, 2; 333-342
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flotation kinetics and thermodynamic behavior of chalcopyrite and pyrite in high alkaline systems
Autorzy:
Yan, H.
Yuan, Q.
Zhou, L.
Qiu, T.
Ai, G.
Powiązania:
https://bibliotekanauki.pl/articles/110078.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flotation kinetics
pyrite
chalcopyrite
flotation separation
high alkaline
microcalorimetry
Opis:
The monomineral flotation test and microcalorimetry were used to study the flotation kinetics and thermodynamic behavior of chalcopyrite and pyrite in high alkaline systems of lime and NaOH. The results showed that in these systems there were less hydrophilic substances on the chalcopyrite surface, so that the apparent activation energy of sodium butyl xanthate (SBX) adsorption on chalcopyrite surface was low. This promoted the adsorption of SBX and increased the flotation rate and recovery of chalcopyrite. In contrast, the hydrophilic Fe(OH)3 and SO42- formed by oxidation on the pyrite surface increased the adsorption activation energy of SBX. Thus, the flotation rate and recovery of pyrite were lower. Moreover, in the lime high alkaline system, the hydrophilic calcium film generated on the pyrite surface further hindered the adsorption of SBX, thereby further inhibiting pyrite in this environment. In other words, the lime high alkaline environment increased the apparent activation energy difference of SBX adsorption between chalcopyrite and pyrite compared to the NaOH system, facilitating the flotation separation of chalcopyrite and pyrite. The results can help with the theoretical research of flotation separation of other minerals, and provide guidance for developing low alkaline and lime-free pyrite depressants.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 3; 901-910
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prevalence of pathogenicity island ETT2 in Escherichia coli isolated from piglets with diarrhea in northeast of China
Autorzy:
Yuan, C.W.
Liu, W.X.
Hou, J.L.
Zhang, L.G.
Wang, G.Q.
Powiązania:
https://bibliotekanauki.pl/articles/2087783.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Escherichia coli
pathogenicity island
ETT2
piglets
diarrhea
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 1; 5-12
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Germocyte lesions caused by porcine circovirus type 2b in Kunming mice
Autorzy:
Yuan, A.W.
Pang, P.
Gong, Q.L.
Deng, Z.B.
Powiązania:
https://bibliotekanauki.pl/articles/31710.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:
Porcine circovirus type 2 (PCV2) has been known as a causative agent of reproductive failure in the sow. In the present study mouse model was used to investigate PCV2 infection. In order to investigate whether PCV2 can induce lesions of spermatocytes and oocytes, 6 male and 6 female mice were each inoculated intraperitoneally with PCV2b, and 3 male and 3 female mice mock-infected with cell culture supernatant served as controls. Samples of testes and ovaries from PCV2b-inoculated and mock-infected mice were investigated using PCR, histopathological, ultrastructural and immunofluorescent histochemical methods at 14 and 21 day post infection (dpi). The study revealed that in the virus-inoculated mice leydig cells in testes and granulosa cells in ovaries were degenerated, and a small number of spermatocytes and oocytes showed apoptosis. Positive PCV2b antigen signals were also observed in these apoptotic cells. It can be suggested that PCV2 can cause lesions of spermatocyte and oocyte prior to zygotes formation in its host.
Źródło:
Polish Journal of Veterinary Sciences; 2017, 20, 1
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł

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