Autor: Tu, B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Removal of clofibric acid and diclofenac during anaerobic digestion of sewage sludge
Autorzy:: Zhou, H.
Zhang, Q.
Zhang, Q
Ma, L.
Tu, B.
Li, H.
Zhou, Y.
Powiązania:: https://bibliotekanauki.pl/articles/207894.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: fermentacja beztlenowa
osady ściekowe
farmaceutyki
kwas klofibrowy
diklofenak
anaerobic digestion
sewage sludge
pharmaceuticals
clofibric acid
diclofenac
Opis:: Removal of two acidic pharmaceuticals, clofibric acid and diclofenac, present in sewage sludge using two kinds of anaerobic digestions was investigated. The effective isolation and purification pretreatment to extract the target compounds from the sewage sludge samples was firstly established, followed by gas chromatography-mass spectrometry (GC-MS) analysis to identify and quantify them. Under mesophilic conditions, the removal efficiencies for clofibric acid and diclofenac with the initial concentrations of 5 μg /dm3 were up to 95% and 97%. After thermophilic anaerobic digestion, the removal efficiency could be increased to 99.3% for clofibric acid, however, it did not increase for diclofenac. In general, anaerobic digestion could effectively remove the target compounds from the sewage sludge (all above 90%).
Źródło:: Environment Protection Engineering; 2013, 39, 4; 63-77
0324-8828
Pojawia się w:: Environment Protection Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The research of characteristic for mining coal seam deformation and seepage flow after the protective layer was mined
Badanie charakterystyki deformacji złoża węglowego i przepływu gazu po eksploatacji warstwy ochronnej
Autorzy:: Tu, M.
Fu, B. J.
Powiązania:: https://bibliotekanauki.pl/articles/348655.pdf
Data publikacji:: 2012
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: wydobycie z odprowadzaniem gazu
deformacja węgla
przeciek
odwierty ukośno-pionowe (w górę)
odprowadzanie zdekompresowanego gazu
depressurized mining
coal deformation
seepage
oblique-upward crossing drilling
pressure relief gas drainage
Opis:: Based on (RFPA2D-Gasflow) numerical software, the characteristic of mining strata damage and fracture distribution after the mining of protective layer has been analyzed and the coal seam by discharging pressure level and vertical displacement change rule has been studied. Finally the coal seam gas pressure and permeability evolution characteristics after the discharging pressure mining has been concluded. Research results show that as the range of stope expand, the discharged pressure coal seam gas pressure is reduced, and the permeability of coal seam is increased signiificantly. The research result has been applied by the engineering. A lane is arranged in a group of inclined to wear on the length of drilling, extraction discharging pressure gas effect is remarkable, which ensure the safety and efficiency of mining, research results for discharging pressure gas extraction and extraction drilling provides theoretical basis for designing.
Za pomocą oprogramowania numerycznego (RFPA2D-Gasflow) przeprowadzono analizę charakterystyki szczelinowania pokładów węgla oraz zeszczelinowania po eksploatacji warstwy ochronnej, a także zbadano złoże węgla kamiennego na podstawie ciśnienia odprowadzanego gazu i zasady przesunięcia pionowego. Następnie opracowano charakterystykę zmienności ciśnienia i gazoprzepuszczalności złoża węglowego po odprowadzeniu gazu z pokładu. Wyniki badania pokazują, obniżenie ciśnienia gazu odprowadzanego ze złoża węglowego oraz znaczne zwiększenie gazoprzepuszczalności złoża węglowego. Wyniki badania zostały zastosowane w technice inżynierskiej. W pochylni wykonano wyrobisko dla skrócenia wiercenia, co pozwoliło na skuteczniejsze zmniejszenie ciśnienia gazu odprowadzanego podczas wiercenia, a przez to na zapewnienie bezpieczeństwa i wydajności procesu wydobycia gazu. Wyniki badania ujmowania gazu podczas wiercenia stanowią podstawę teoretyczną do tworzenia nowych projektów.
Źródło:: AGH Journal of Mining and Geoengineering; 2012, 36, 3; 367-376
1732-6702
Pojawia się w:: AGH Journal of Mining and Geoengineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: On the Interaction of Resonance And Bragg Scattering Effects for the Locally Resonant Phononic Crystal with Alternating Elastic and Fluid Matrices
Autorzy:: Yuan, B.
Chen, Y.
Jiang, M.
Tang, S.
He, M.
Tu, M.
Powiązania:: https://bibliotekanauki.pl/articles/177103.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: locally resonant phononic crystals
effective speed of sound
coupling band gaps
underwater acoustic materials
Opis:: Three-dimensional (3D) locally resonant phononic crystals (LRPCs) are studied with the aim of optimising the sub-wavelength band gaps of such composites. By analysing their effective acoustic properties, it has been found that the effective acoustic speed of the composite will drop to zero when local resonance arise, and will increase monotonically when Bragg scattering effects occur. Moreover, if the matrix is a low-shear-speed medium, local resonators can significantly reduce the effective acoustic speed of the composite and, therefore, lower the frequency where Bragg scattering effects occur. Hence, a specific LRPC with alternating elastic and fluid matrices is proposed, whose resonance and Bragg gaps are already close in frequency. The fluid matrix behaves as a wave filter, which prevents the shear waves from propagating in the composite. By using the layer-multiple-scattering theory, the coupling behaviour of local resonance and Bragg scattering band gaps has been investigated. Both gaps are enhanced when they move closer to each other. Finally, a gap-coupled case is obtained that displays a broad sub-wavelength band gap. Such proposal excels at the application of underwater acoustic materials since the arrangement of structure can be handily adjusted for tuning the frequency of coupled gap.
Źródło:: Archives of Acoustics; 2017, 42, 4; 725-733
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Modulation of virulence genes by the two-component system PhoP - PhoQ in avian pathogenic Escherichia coli
Autorzy:: Tu, J.
Huang, B.
Zhang, Y.
Xue, T.
Li, S.
Qi, K.
Powiązania:: https://bibliotekanauki.pl/articles/30418.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: Avian pathogenic Escherichia coli (APEC) infections are a very important problem in the poultry industry. PhoP-PhoQ is a two-component system that regulates virulence genes in APEC. In this study, we constructed strains that lacked the PhoP or PhoQ genes to assess regulation of APEC pathogenicity by the PhoP-PhoQ two-component system. The PhoP mutant strain AE18, PhoQ mutant strain AE19, and PhoP/PhoQ mutant strain AE20 were constructed by the Red homologous recombination method. Swim plates were used to evaluate the motility of the APEC strains, viable bacteria counting was used to assess adhesion and invasion of chick embryo fibroblasts, and Real-Time PCR was used to measure mRNA expression of virulence genes. We first confirmed that AE18, AE19, and AE20 were successfully constructed from the wild-type AE17 strain. AE18, AE19, and AE20 showed significant decreases in motility of 70.97%, 83.87%, and 37.1%, respectively, in comparison with AE17. Moreover, in comparison with AE17, AE18, AE19, and AE20 showed significant decreases of 63.11%, 65.42%, and 30.26%, respectively, in CEF cell adhesion, and significant decreases of 59.83%, 57.82%, and 37.90%, respectively, in CEF cell invasion. In comparison with AE17, transcript levels of sodA, polA, and iss were significantly decreased in AE18, while transcript levels of fimC and iss were significantly decreased in AE19. Our results demonstrate that deletion of PhoP or PhoQ inhibits invasion and adhesion of APEC to CEF cells and significantly reduces APEC virulence by regulating transcription of virulence genes.
Źródło:: Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Digital volume correlation in an environment with intensive salt-and-pepper noise and strong monotonic nonlinear distortion of light intensity
Autorzy:: Tu, P.
Bai, Y.
Xu, W.
Dong, B.
Ye, S.
Yang, Q.
Zhou, Y.
Powiązania:: https://bibliotekanauki.pl/articles/173712.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: digital volume correlation
correlation function
salt-and-pepper noise
nonlinear effects
Opis:: Digital volume correlation is an image-based technique for internal 3D displacement and strain fields measurement or analysis widely used in the field of experimental mechanics. A widely used correlation function (criterion) of digital volume correlation is Pearson correlation function, which suffers from the problem of the acquired data being contaminated by salt-and-pepper noise and monotonic nonlinear distortion of the light intensity. In this work, a 3D correlation function called the Spearman correlation function is used to deal with those interferences. A numerical experiment shows that the performance of Spearman correlation function using integer-pixel registration in an environment with 10% salt-and-pepper noise is better than that of Spearman and Pearson correlation functions using sub-pixel registration in an environment with 1% salt-and-pepper noise. As the light intensity distortion is significant, the error of Pearson correlation function is considerable; meanwhile, the error of Spearman correlation function is small. In conclusion, Spearman correlation function is, in particular, practical and useful in digital volume correlation.
Źródło:: Optica Applicata; 2017, 47, 2; 209-223
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The irp2 and fyuA genes in High Pathogenicity Islands are involved in the pathogenesis of infections caused by avian pathogenic Escherichia coli (APEC)
Autorzy:: Tu, J.
Hue, T.
Qi, K.
Shao, Y.
Huang, B.
Wang, X.
Zhou, X.
Powiązania:: https://bibliotekanauki.pl/articles/30327.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: Avian pathogenic Escherichia coli (APEC) is a major bacterial infectious disease that may lead to local or systemic infections in chickens with clinical manifestations. The irp2-fyuA gene cluster has been confirmed to be the main genes involved in the synthesis of HPI. The objective of this study was to determine the influence of the irp2 and fyuA genes in the high pathogenicity island (HPI) of avian pathogenic Escherichia coli (APEC) on its pathogenicity by knocking out these genes. The ΔAE17 (lacking irp2) and ΔΔAE17 (lacking irp2 and fyuA) strains of APEC were constructed. The ΔAE17 and ΔΔAE17 strains showed significantly impaired capacity to adhere onto DF-1 cells. The LD50 results indicated that the virulence of the ΔAE17 and ΔΔAE17 strains was decreased in comparison with that of the AE17 strain. We concluded that the knock-out of the core HPI genes weakened APEC adhesion onto DF-1 cells, inhibited transcription of virulence genes, and reduced pathogenicity in chicks. The effects of genetic deletion of irp2 and fyuA on APEC were more severe than those produced by deletion of irp2 only, indicating that irp2 and fyuA co-regulate APEC pathogenicity.
Źródło:: Polish Journal of Veterinary Sciences; 2016, 19, 1
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki