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    Wyświetlanie 1-11 z 11
    Tytuł:
    Tubular biofilter treatment of isobutanol emissions under various organic loading rates
    Autorzy:
    Chen, Hong
    Peng, Liang
    Wei, Yanxiao
    Yu, Lie
    Jiang, Bo
    Wang, Hong
    Yu, Guanlong
    Zhang, Guijin
    Powiązania:
    https://bibliotekanauki.pl/articles/207774.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biofiltration
    pollutants removal
    volatile compounds
    biofiltracja
    usuwanie zanieczyszczeń
    związki lotne
    Opis:
    Isobutanol in waste gas streams was treated by a tubular biofilter (TBF) which continuously operated for 364 days under various organic loading rate (OLR) from 11 g·m–3·h–1 to 66 g·m–3·h–1. Results show that within 60 days, the TBF successfully started up even after changing the OLR from 31.3 to 15.6 g·m–3·h–1. The average removal efficiencies (REs) were totally higher than 90% when OLRs ranged from 12.14 to 66.45 g·m–3·h–1. Two distinct performance deterioration periods were observed at days 186–253 and days 280–334, both of which recovered without additional measurement. During these periods, the larvae and adult moth flies, been identified as Psychodinae infested the TBF, greatly affected the TBF performance. When the number of adult Psychodinae decreased, TBF performance recovered. The elimination capacity (EC) was 60.42 g·m–3·h–1 at the inlet OLR of 66.45 g·m–3·h–1, with the critical EC being around 50 g·m–3·h–1. Even under a low gas empty bed residence time of 15 s, the preferable REs and ECs under middle or low OLRs were still obtained by the TBF.
    Źródło:
    Environment Protection Engineering; 2020, 46, 1; 15-29
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Lagrangian Density of {123, 234, 456} and the Turán Number of its Extension
    Autorzy:
    Chen, Pingge
    Liang, Jinhua
    Peng, Yuejian
    Powiązania:
    https://bibliotekanauki.pl/articles/32222733.pdf
    Data publikacji:
    2021-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    Turán number
    hypergraph Lagrangian
    Lagrangian density
    Opis:
    Given a positive integer $n$ and an $r$-uniform hypergraph $F$, the Turán number $ex(n, F)$ is the maximum number of edges in an $F$-free $r$-uniform hypergraph on $n$ vertices. The Turán density of $F$ is defined as \(π(F)=lim_{n→∞}\frac{ex(n,F)}{\binom{n}{r}}\). The Lagrangian density of $F$ is \(π_\lambda(F) = sup\{r!\lambda(G):G\) is \(F-free\}\), where $\lambda(G)$ is the Lagrangian of $G$. Sidorenko observed that \(π(F) ≤ π_\lambda(F)\), and Pikhurko observed that \(π(F) = π_\lambda(F)\) if every pair of vertices in $F$ is contained in an edge of $F$. Recently, Lagrangian densities of hypergraphs and Turán numbers of their extensions have been studied actively. For example, in the paper [A hypergraph Turán theorem via Lagrangians of intersecting families, J. Combin. Theory Ser. A 120 (2013) 2020–2038], Hefetz and Keevash studied the Lagrangian densitiy of the 3-uniform graph spanned by {123, 456} and the Turán number of its extension. In this paper, we show that the Lagrangian density of the 3-uniform graph spanned by {123, 234, 456} achieves only on $K_5^3$. Applying it, we get the Turán number of its extension, and show that the unique extremal hyper-graph is the balanced complete 5-partite 3-uniform hypergraph on $n$ vertices.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2021, 41, 4; 905-921
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Developing a Social Enterprise Performance Scale and Examining the Relationship Between Entrepreneurs’ Personality Traits and Their Perceived Enterprise Performance
    Autorzy:
    Liang, Chao-Tung
    Peng, Li-Pei
    Yao, Shu-Nung
    Liang, Chaoyun
    Powiązania:
    https://bibliotekanauki.pl/articles/474936.pdf
    Data publikacji:
    2015
    Wydawca:
    Fundacja Upowszechniająca Wiedzę i Naukę Cognitione
    Tematy:
    performance assessment
    personality traits
    scale development
    social enterprise
    social enterprise performance scale
    Opis:
    On the basis of the lack of measurement tools and the research gap regarding social entrepreneurship, three studies were conducted to develop a new measure of social enterprise (SE) performance that is empirically valid and easy to administer. The purpose of this measure was to examine the relationship between entrepreneurs’ personality traits and their perceived SE performance. The results indicated that SE performance can be assessed using four dimensions: personal issues, social aspects, business elements, and service programmes. Extraversion positively influenced service programmes, and openness negatively affected service programmes. Neuroticism and conscientiousness positively predicted personal issues and service programmes, and agreeableness positively predicted all dimensions of perceived SE performance. The results also demonstrated the curvilinear relationship of the U-shaped curve between neuroticism and personal issues and the social aspects of SE performance. Furthermore, the results showed the curvilinear relationship of the inverted U-shaped curve between agreeableness and the four dimensions of SE performance.
    Źródło:
    Journal of Entrepreneurship, Management and Innovation; 2015, 11, 3; 89-116
    2299-7075
    2299-7326
    Pojawia się w:
    Journal of Entrepreneurship, Management and Innovation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in the flotation kinetic of bituminous coal before and after natural weathering processes
    Autorzy:
    Xia, W.
    Peng, Y.
    Ren, C.
    Xie, G.
    Liang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/951864.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetic
    classical first-order rate constant
    natural weathering processes
    XPS
    contact angle
    Opis:
    Natural weathering processes can make coal surface more hydrophilic due to the increase of content of hydrophilic functional groups (C-O, C=O, and COOH) and the decrease of content of hydrophobic functional groups (C-C and C-H) on coal surface, and hence the flotation recovery of fine coal is reduced. In this paper, a series of flotation tests were conducted in order to investigate the changes in the flotation kinetic of bituminous coal before and after natural weathering processes. Additionally, XPS was used to indicate the changes in surface properties of bituminous coal. In the investigations the flotation kinetic was changing. The classical first-order rate constant (k) of bituminous coal flotation was reduced after the natural weathering processes. A relationship between the classical first-order rate constant (k) and the hydrophilicity ability (HA) was given.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 401-410
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and experiments using a spiral-liquid-solid fluidized bed system
    Autorzy:
    Sha, J.
    Liang, L.
    Liu, B.
    Xie, G.
    Peng, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/110520.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    liquid-solid fluidized bed
    spiral unit
    coal separation
    water quantity
    Opis:
    Liquid-solid fluidized bed (LSFB) has been widely known and used for separation of coarse coal particles (normally larger than 0.25 mm). The process of separation by LSFB needs fluidization water from the bottom to the top of LSFB. The fluidization water is formed by the water addition at the bottom of the LSFB. Normally the quantity of water addition is very large, which increases the burden of water treatment in coal preparation processes. In this investigation, a spiral unit was introduced into the conventional LSFB and the new separation equipment was named S-LSFB. The spiral unit could provide an upward force for the upward movement of coarse low density coals into the concentrate, and hence the quantity of water addition for fluidization water may be reduced. Samples of 0.5-0.25 mm size fraction coal were used to investigate the difference in separation performance between S-LSFB and LSFB. It was found that the separation performance of S-LSFB was nearly equal to that of LSFB. S-LSFB may be beneficial to coarse coal separation in coal preparation plant since the burden of water treatment can be reduced by the application of S-LSFB.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2015, 51, 2; 427-434
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ultrasonic treatment on the particle size, shape and ash content of fine coal
    Autorzy:
    Mao, Yuqiang
    Xie, Guangyuan
    Liang, Long
    Xia, Wencheng
    Peng, Yaoli
    Powiązania:
    https://bibliotekanauki.pl/articles/109544.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ultrasonic time
    fine coal
    particle size
    particle shape
    ash content
    Opis:
    The effects of ultrasonic treatment of different time on the particle size, morphology, ash content, and elementary composition of fine coal particles (74-45 μm) were investigated in this paper. The size reduction of coal particles induced by ultrasonic treatment was analyzed through the Focused Beam Reflectance Measurement (FBRM) and the variation of mechanical pulverization mechanism was discussed. The Scanning Electron Microscope (SEM) measurements showed that the sharp corners on coal particles was ground to round ones after ultrasonic treatment. This may be not conducive to coal flotation. It was also found that the ash content of 74-45 μm coal particles was increased gradually with the increase of ultrasonic time, while the ash content of -45 μm fraction was decreased. This was supported by the EDS measurements, indicating that the carbon content on the surfaces of 74-45 μm coal was reduced while the aluminium and silicon contents were increased after ultrasonic treatment.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 3; 679-688
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibration of composite cylindrical shells with orthogonal stiffeners
    Autorzy:
    Wu, Yongfu
    Zhao, Chen
    Liang, Haofeng
    Yao, Sishi
    Xue, Jianghong
    Xu, Peng
    Powiązania:
    https://bibliotekanauki.pl/articles/2086971.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    free vibration
    laminated cylindrical shells
    stiffener
    energy method
    Opis:
    This paper proposes theoretical and numerical approaches to scrutinize the free vibration of orthogonal stiffened cylindrical shells. According to K´arman-Donnell shell theory, the total energy of the stiffened cylindrical shells is derived. Based on the principle of minimum potential energy, the eigenfunction related to the frequency is established and solved by developing a Matlab program. Analytical solutions of the natural frequency for free vibraion of the stiffened cylindrical shells are calculated and are verified against the finite element results from ABAQUS software. On account of the observations from the parametric study, an optimization scheme of the stiffeners is proposed.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 2; 239--252
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary study to explore gene-$\text{PM}_\text{2.5}$ interactive effects on respiratory system in traffic policemen
    Autorzy:
    Zhao, Jinzhuo
    Bo, Liang
    Gong, Changyi
    Cheng, Peng
    Kan, Haidong
    Xie, Yuquan
    Song, Weimin
    Powiązania:
    https://bibliotekanauki.pl/articles/2177102.pdf
    Data publikacji:
    2015-08-07
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    inflammation
    Fine Particles
    traffic workers
    respiratory system
    single nucleotide polymorphism
    SNP
    Opis:
    Objectives Traffic-related particulate matter (PM) is one of the major sources of air pollution in metropolitan areas. This study is to observe the interactive effects of gene and fine particles (particles smaller than 2.5 μm – $\text{PM}_\text{2.5}$) on the respiratory system and explore the mechanisms linking $\text{PM}_\text{2.5}$ and pulmonary injury. Material and Methods The participants include 110 traffic policemen and 101 common populations in Shanghai, China. Continuous 24 h individual-level $\text{PM}_\text{2.5}$ is detected and the pulmonary function, high-sensitivity C-reactive protein (hs-CRP), Clara cell protein 16 (CC16) and the polymorphism in CXCL3, NME7 and C5 genes are determined. The multiple linear regression method is used to analyze the association between $\text{PM}_\text{2.5}$ and health effects. Meanwhile, the interactive effects of gene and $\text{PM}_\text{2.5}$ on lung function are analyzed. Results The individual $\text{PM}_\text{2.5}$ exposure for traffic policemen was higher than that in the common population whereas the forced expiratory volume in 1 s (FEV₁), the ratio of FEV₁ to forced vital capacity (FEV₁/FVC) and lymphocytes are lower. In contrast, the hs-CRP level is higher. In the adjusted analysis, $\text{PM}_\text{2.5}$ exposure was associated with the decrease in lymphocytes and the increase in hs-CRP. The allele frequencies for NME7 and C5 have significant differences between FEV₁/FVC ≤ 70% and FEV₁/FVC > 70% participants. The results didn’t find the interaction effects of gene and $\text{PM}_\text{2.5}$ on FEV₁/FVC in all the 3 genes. Conclusions The results indicated that traffic exposure to high levels of $\text{PM}_\text{2.5}$ was associated with systemic inflammatory response and respiratory injury. Traffic policemen represent a high risk group suffering from the respiratory injury.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 6; 971-983
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A film stress measurement system applicable for hyperbaric environment and its application in coal and gas outburst simulation test
    Autorzy:
    Liu, Zhong-Zhong
    Wang, Han-Peng
    Yuan, Liang
    Wang, Wei
    Zhang, Chong
    Xue, Yang
    Powiązania:
    https://bibliotekanauki.pl/articles/1848966.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stress measurement system
    sealing technology
    hyperbaric environment
    coal and gas outburst
    gas-solid coupling
    Opis:
    A film stress measurement system applicable for hyperbaric environment was developed to characterize stress evolution in a physical simulation test of a gas-solid coupling geological disaster. It consists of flexible film pressure sensors, a signal conversion module, and a highly-integrated acquisition box which can perform synchronous and rapid acquisition of 1 kHz test data. Meanwhile, we adopted a feasible sealing technology and protection method to improve the survival rate of the sensors and the success rate of the test, which can ensure the accuracy of the test results. The stress measurement system performed well in a large-scale simulation test of coal and gas outburst that reproduced the outburst in the laboratory. The stress evolution of surrounding rock in front of the heading is completely recorded in a successful simulation of the outburst which is consistent with the previous empirical and theoretical analysis. The experiment verifies the feasibility of the stress measurement system as well as the sealing technology, laying a foundation for the physical simulation test of gas-solid coupled geological disasters.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 73-88
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tests and analyses on mechanical characteristics of dwarf-dense-early major cotton variety stalks
    Autorzy:
    Liang, R.
    Chen, X.
    Zhang, B.
    Peng, X.
    Meng, H.
    Jiang, P.
    Li, J.
    Zhou, P.
    Kan, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082915.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    cotton stalk
    dwarf-dense-early
    multiple factors
    mechanical characteristics
    Opis:
    The influence of the variation in water content, sampling location and loading speed on the shearing and across-compression mechanical characteristics of dwarf-denseearly major cotton variety stalks was analysed. The second-order response models of the factors vs. the maximum shear force and critical across-compression failure force were built using the response surface methodology. Besides, the sampling location and water content have a significant influence over the maximum shear force and critical across-compression failure force, especially the sampling location. Both the maximum shear force and critical across-compression failure force reach a theoretical maximum when the water content is 10%, the sampling location is the lower part and the loading speed is 40 mm min-1. When the sampling location is the lower part, optimization is carried out assuming the theoretical minimum of the maximum shear force and critical across-compression failure force as the optimization target. In this case, the loading speed is 20 mm min-1, while the water content is between 30 and 50%. This indicates that the parameter range requires a low power consumption during the crushing of film residue mixtures. The test data can provide some theoretical references for the technical research and equipment development for the crushing of film.
    Źródło:
    International Agrophysics; 2020, 34, 3; 333-342
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The distribution of different virulence grass carp reovirus strains in some neglected tissues
    Autorzy:
    Liang, H.R.
    Fu, X.Z.
    Li, N.Q.
    Liu, L.H.
    Lin, Q.
    Li, Y.G.
    Peng, Y.A.
    Huang, Z.B.
    Wu, S.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/30668.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Polish Journal of Veterinary Sciences; 2016, 19, 4
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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