Autor: Peng, T. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Beneficial effects and mechanism of lead ion on wolframite flotation
Autorzy:: Yang, S.
Qiu, X.
Peng, T.
Chang, Z.
Feng, Q.
Zhong, C.
Tematy:: activator
wolframite
lead ion
benzohydroxamic acid
flotation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/109484.pdf Link otwiera się w nowym oknie
Opis:: In this study the effects and mechanism of lead ions influence on wolframite flotation with benzohydroxamic acid (BHA) were studied through micro-flotation, adsorption experiments, zeta potential measurements, logarithmic concentration diagram, and X-ray photoelectron spectroscopy. It was observed that lead ions could significantly enhance the recovery of wolframite in flotation and adsorption density of collector BHA onto the wolframite surface. The results showed that Pb existed in the forms of lead ion, monohydric lead, and lead hydroxide at the water-wolframite interface respectively, at three pH ranges. They increased the zeta potential of wolframite. However, the zeta potential of wolframite was still negative, resulting in repulsive electrostatic force to anionic collector BHA. Combining with XPS spectra, it revealed the chemisorption of BHA onto the wolframite surface. In addition, PbO or Pb(OH)2 was observed on the wolframite surface due to the reaction between lead ions and wolframite. These reaction products increased the adsorption site of BHA on the wolframite surface because Pb-hydroxamate was found on the wolframite surface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Seroprevalence of antibodies to classical swine fever virus and porcine reproductive and respiratory syndrome virus in healthy pigs in Hunan Province, China
Autorzy:: Yu, H.
Zhang, L.
Cai, Y.
Hao, Z.
Luo, Z.
Peng, T.
Liu, L.
Wang, N.
Wang, G.
Deng, Z.
Zhan, Y.
Tematy:: classical swine fever virus (CSFV)
porcine reproductive and respiratory syndrome virus (PRRSV)
pig
seroprevalence
antibody; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/16539345.pdf Link otwiera się w nowym oknie
Opis:: Classical swine fever (CSF) and porcine reproductive and respiratory syndrome (PRRS) are responsible for major economic losses and represent a threat to the swine industry worldwide. Routine surveillance serology for CSF and PRRS viruses is critical to maintaining the health status of sow farms in Hunan Province, which is one of the top pig production provinces in China. The aim of our study was to investigate the serological statistics of CSF virus (CSFV) and PRRS virus (PRRSV) in Hunan Province. The cohort serum samples were collected from vaccinated and unvaccinated pigs. Our findings showed that the average rates of CSFV and PRRSV antibody seropositivity were 82.2% (95% CI: 80.1-84.3) and 84.8% (95% CI: 82.5-87.1), respectively, in the immunized group and that these rates were higher than those in the unvaccinated group (58.6% for CSFV and 47.8% for PRRSV). Additionally, the level of CSFV antibody in piglet serum declined gradually with age, whereas PRRSV-specific antibody level increased initially (1 to 2 weeks old) and then declined with age (2 to 4 weeks old). In summary, we investigated the difference in CSFV/PRRSV antibody levels among piglets at various weeks old (1 to 4 weeks) to further establish the duration of maternal immunity in piglets. In addition, routine monitoring of CSFV/PRRSV antibodies in immunized pigs was carried out to evaluate the efficacy of vaccination.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Contrasted effects of biochar on maize growth and N use efficiency depending on soil conditions
Autorzy:: Zhu, Q.
Peng, X.
Huang, T.
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/26143.pdf Link otwiera się w nowym oknie
Opis:: Biochar amendment may improve crop growth through its nutrients and indirect fertility. However, this improvement varies in a wide range of biochars, crops, and soils. Our objectives were to determine the response of crop growth to biochar amendment and to assess the N use efficiency relative to the biochar and the soil types. In this pot experiment, we investi-gated five typical agricultural soils in China amended with two biochars. Four treatments were designed: the soil itself as a control, the soil amended with 1% biochar, the soil with fertilizer NPK, and the soil with added biochar and fertilizer. Biochar amendment increased the maize biomass and the N use efficiency in the red soil (p<0.05) but not in the other four soils (p>0.05). In the red soil, the biomass under biochar+NPK was 2.67-3.49 times higher than that of only NPK, and 1.48-1.62 times higher than that of only biochar amendment, 21-36 and 35-42% of which were contributed from biochar fertility and indirect fertility, respectively. This study indicates that biochar amendment is very plausible for the red soil but has a minor or even negative effect on the other four soils in China.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Zeta potential of Polish copper-bearing shale in the absence and presence of flotation frothers
Autorzy:: Peng, M.
Ratajczak, T.
Drzymała, J.
Tematy:: zeta potential
frother
flotation
shale
pH
isoelectric point
IEP
empirical equation; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Powiązania:: https://bibliotekanauki.pl/articles/89095.pdf Link otwiera się w nowym oknie
Opis:: In this paper, zeta potential as a function of pH of copper-bearing shale, which is mined in Poland by KGHM, was investigated. The measurements were conducted in water and aqueous solutions of selected flotation frothers. It was established that for investigated copper-bearing shale, after dispersion in water, the isoelectric point (IEP) occurs at pH=3.5. Addition of frothers decreased the IEP on the pH scale and the IEP for butanol was 1.93, for MIBC 2.90 and for eicosaethylene glycol hexadecyl ether (C16E20) 2.76. In the case of introducing frothers changed, the zeta potential becomes less negative. An empirical equation, having two adjustable parameters, was used in the paper to approximate the course of the zeta potential-pH curve. The equation showed a very good approximation of the zeta potential of the investigated shale either in water or frother aqueous solutions.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A Weibull failure model to the study of the hierarchical Bayesian reliability
Model uszkodzeń aproksymowa ny rozkładem Weibulla do badania niezaw odności reprezentowanej za pomocą hierarchicznej sieci Bayesowskiej
Autorzy:: Zhu, T.
Yan, Z.
Peng, X.
Tematy:: hierarchical Bayesian model
progressive type-II censoring
hyper parameter
Monte Carlo simulation
parameter estimation
hierarchiczny model bayesowski
ucinanie progresywne typu II
hiperparametr
symulacja Monte Carlo
estymacja parametrów; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/300717.pdf Link otwiera się w nowym oknie
Opis:: This paper describes the unknown parameter and reliability function of the Weibull distribution based on hierarchical Bayesian model for the progressively Type-II censored data. The scale parameter of the Weibull distribution is considered with a gamma prior under the shape parameter is known. Furthermore, the scale parameter of the gamma prior is assumed to be three different known hyper prior. Under these assumptions, the Weibull parameter and reliability function estimators are derived based on the squared error loss (SEL) function, which can be easily extended to other loss functions situation. The result from hierarchical Bayesian method is used to compare with Bayes and maximum likelihood estimate (MLE) methods. The simulation shown that the results from Bayes is the best, followed by hierarchical Bayesian method, and then MLE in terms of root mean square error (RMSE). Finally, one real dataset has been analyzed for illustrative purposes.
W prezentowanej pracy opisano metodę estymacji nieznanego parametru oraz funkcji niezawodności rozkładu Weibulla w oparciu o hierarchiczny model Bayesa dla danych uciętych (cenzurowanych) progresywnie typu II. Rozważano parametr skali rozkładu Weibulla o rozkładzie prawdopodobieństwa apriorycznego gamma w sytuacji, gdzie wartość parametru kształtu była znana. Ponadto, przyjęto, że (hiper)parametr skali rozkładu apriorycznego gamma może mieć trzy różne, znane hiper-rozkłady aprioryczne (ang. hyper priors). Przy tych założeniach, estymatory parametru i funkcji niezawodności rozkładu Weibulla wyprowadzono na podstawie kwadratowej funkcji straty (ang. squared error loss, SEL), którą można łatwo rozszerzyć na inne funkcje straty. Wyniki otrzymane z wykorzystaniem hierarchicznej metody Bayesowskiej porównano z wynikami klasycznej estymacji Bayesowskiej oraz estymacji metodą największego prawdopodobieństwa (ang. maximum likelihood estimate, MLE). Symulacja wykazała, że najlepsze wyniki, jeśli chodzi o średnią kwadratową błędów (ang. root mean squared error, RMSE), daje metoda Bayesa, a w dalszej kolejności hierarchiczna metoda Bayesa oraz MLE. W końcowej części pracy rozważane problemy zilustrowano analizując zbiór danych rzeczywistych.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Microstructure and Mechanical Behavior of Mg-0.5Si-xSn Alloys
Autorzy:: Fu, X.
Yang, Y.
Ma, Q. Y.
Peng, X.
Xu, T.
Tematy:: low silicon magnesium alloy
eutectic Mg2Si
microstructure behavior
mechanical behavior
stop magnezu
stop Mg2Si
zachowanie mechaniczne; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/379670.pdf Link otwiera się w nowym oknie
Opis:: Mg-0.5Si-xSn (x=0.95, 2.9, 5.02wt.%) alloys were cast and extruded at 593K (320 ºC) with an extrusion ratio of 25. The microstructure and mechanical properties of as-cast and extruded test alloys were investigated by OM, SEM, XRD and tensile tests. The experimental results indicate that the microstructure of the Mg-0.5Si-xSn alloys consists of primary α-Mg dendrites and an interdendritic eutectic containing α-Mg, Mg₂Si and Mg₂Sn. There is no coarse primary Mg₂Si phase in the test alloys due to low Si content. With the increase in the Sn content, the Mg₂Si phase was refined. The shape of Mg₂Si phase was changed from branch to short bar, and the size of them were reduced. The ultimate tensile strength and yield strength of Mg-0.52Si-2.9Sn alloy at the temperature of 473K (200 ºC) reach 133MPa and 112MPa respectively. Refined eutectic Mg₂Si phase and dispersed Mg₂Sn phase with good elevated temperature stability are beneficial to improve the elevated temperature performance of the alloys. However, with the excess addition of Sn, large block-like Mg₂Sn appears around the grain boundary leading to lower mechanical properties.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Comparison of mechanical flotation cell and cyclonic microbubble flotation column in terms of separation performance for fine graphite
Autorzy:: Bu, X.
Zhang, T.
Chen, Y.
Peng, Y.
Xie, G.
Wu, E.
Tematy:: mechanical flotation
column flotation
Fuerstenau upgrading curve
graphite; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/110791.pdf Link otwiera się w nowym oknie
Opis:: Comparison of flotation performance between the flotation column and mechanical flotation was carried out to promote the grade and economic value of the graphite ore (15.40% ash content). The ash content of the concentrate of the mechanical flotation was 10.77% at the yield of 79.34%. In contrast, the yield of the concentrate of the column flotation was increased to 88.93% with 10.55% ash content. Comparative study of the Fuerstenau upgrading curves indicated that the column flotation was more efficient for cleaning the graphite ore in the presence of the centrifugal force field, nanobubbles (generated by hydrodynamic cavitation), and the thicker froth layer in comparison with the mechanical flotation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A transformer winding deformation detection method based on the analysis of leakage inductance changes
Autorzy:: Jiansheng, L.
Fengbo, T.
Chao, W.
Yuncai, L.
Peng, W.
Mengzhou, Z.
Miao, Y.
Tematy:: condition-based maintenance
winding deformation
leakage inductance
partial least squares regression; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/140628.pdf Link otwiera się w nowym oknie
Opis:: The detection of transformer winding deformation caused by short-circuit current is of great significance to the realization of condition based maintenance. Considering the influence of environment and measurement errors, an online deformation detection method is proposed based on the analysis of leakage inductance changes. First, the operation expressions are derived on the basis of the equivalent circuit and the leakage inductance parameters are identified by the partial least squares regression algorithm. Second, the amount of the leakage inductance samples in a detection time window is determined using the Monte Carlo simulation thought, and then the samples in the confidence interval are obtained. Last, a criteria is built by the mean value changes of the leakage inductance samples and the winding deformation is detected. The online detection method considers the random fluctuation characteristics of the leakage inductance samples, adjust the threshold value automatically, and can quantify the change range to assess the severity. Based on the field data, the distribution of the leakage inductance samples is analyzed to obey the normal function approximately. Three deformation experiments are done by different sub-winding connections and the detection results verify the effectiveness of the proposed method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Characterization of the global network of optical magnetometers to search for exotic physics (GNOME)
Autorzy:: Palm, C. A.
Peng, X.
Grujić, Z. D.
Pustelny, Szymon
Nix, S.
Wickenbrock, A.
Stalnaker, J. E.
Smiga, J. A.
Wurm, D.
Budker, D.
Pankow, C.
Penaflor, A.
Padniuk, Mikhail
Masia-Roig, H.
DeCamp, G.
Guo, H.
Jackson Kimball, D. F.
Kornack, T. W.
Lebedev, V.
Scholtes, T.
Dumont, V.
Afach, S.
Weis, A.
Li, W.
Opis:: The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is a network of geographically separated, time-synchronized, optically pumped atomic magnetometers that is being used to search for correlated transient signals heralding exotic physics. The GNOME is sensitive to nuclear- and electron-spin couplings to exotic fields from astrophysical sources such as compact dark-matter objects (for example, axion stars and domain walls). Properties of the GNOME sensors such as sensitivity, bandwidth, and noise characteristics are studied in the present work, and features of the network’s operation (e.g., data acquisition, format, storage, and diagnostics) are described. Characterization of the GNOME is a key prerequisite to searches for and identification of exotic physics signatures.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 10.

Tytuł:: Multimessenger search for exotic field emission with a global magnetometer network
Autorzy:: Shin, Y. C.
Kim, D.
Semertzidis, Y. K.
Peng, X.
Ruimi, O. M.
Park, S. Y.
Klinger, E.
Pustelny, Szymon
Givon, M.
Segura, P. C.
Kimball, D. F. Jackson
Figueroa, N. L.
Buchler, B. C.
Gavilán-Martín, D.
Wickenbrock, A.
Zhang, J.
Hedges, M. P.
Łukasiewicz, Grzegorz
Budker, D.
Stalnaker, J. E.
Kryemadhi, A.
Kornack, T.
Padniuk, Mikhail
Khamis, Sami S.
Wu, T.
Masia-Roig, H.
Guo, H.
Zhao, Y.
Kukowski, N.
Palm, C. A.
Scholtes, T.
Tandon, D.
Wilson, T. Z.
Hamilton, Paul
Afach, S.
Folman, R.
Pospelov, M.
Rosenzweig, Y.
Grujić, Z. D.
Sulai, Ibrahim A.
Weis, A.
Opis:: The history of astronomy has shown that advances in sensing methods open up new windows to the Universe and often lead to unexpected discoveries. Quantum sensor networks in combination with traditional astronomical observations are emerging as a novel modality for multimessenger astronomy. Here we develop a generic analysis framework that uses a data-driven approach to model the sensitivity of a quantum sensor network to astrophysical signals as a consequence of beyond-the-standard model (BSM) physics. The analysis method evaluates correlations between sensors to search for BSM signals coincident with astrophysical triggers, such as black hole mergers, supernovae, or fast radio bursts. Complementary to astroparticle approaches that search for particlelike signals (e.g., weakly interacting massive particles), quantum sensors are sensitive to wavelike signals from exotic quantum fields. This analysis method can be applied to networks of different types of quantum sensors, such as atomic clocks, matter-wave interferometers, and nuclear clocks, which can probe many types of interactions between BSM fields and standard model particles. We use this analysis method to carry out the first direct search utilizing a terrestrial network of precision quantum sensors for BSM fields emitted during a black hole merger. Specifically, we use the global network of optical magnetometers for exotic physics (GNOME) to perform a search for exotic low-mass field (ELF) bursts generated in coincidence with a gravitational-wave signal from a binary black hole merger (GW200311_115853) detected by LIGO/Virgo on the March 11, 2020. The associated gravitational wave heralds the arrival of the ELF burst that interacts with the spins of fermions in the magnetometers. This enables GNOME to serve as a tool for multimessenger astronomy. Our search found no significant events and, consequently, we place the first lab-based limits on combinations of ELF production and coupling parameters.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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