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    Wyświetlanie 1-7 z 7
    Tytuł:
    Frothers and gas dispersion: A review of the structure-property-function relationship
    Autorzy:
    Tan, Y. H.
    Finch, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/109942.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    frothers
    alcohols
    polyglycols
    frother structure
    mechanisms
    Opis:
    Over the past 20 years quantitative measures of frother functions have been developed to try to replace such qualitative descriptors as “weak” and “strong”. One of these metrics is the critical coalescence concentration (CCC) that quantifies a frother’s ability to reduce bubble size; another is the concentration at minimum velocity (CMV) that quantifies a frother’s ability to reduce bubble rise velocity. The experimental procedure for the two measures is briefly outlined and the measures are shown to be related. Using CMV, based on more than 50 surfactants from the two main frother families, alcohols and polyglycols, the frother structure-property-function link is investigated. The structure variables were: in alcohols, alkyl chain length, and position of the methyl branch and hydroxyl group(s); and in polyglycols, alkyl chain length, and number of propylene oxide (PO) or ethylene oxide (EO) groups. On the argument that low CMV represents the desired outcome, the main findings are: the dominant effect of alkyl chain length in both alcohols and polyglycols; that for alcohols branched-chain isomers are superior to straight chain, with the best combination being OH at the terminus and the methyl branch as far away as possible; and for polyglycols, PO-based are superior to EO-based. Interpretation of these observations included the effect of structure on the following properties: surface activity, mass transfer rate, H-bonding, and molecule packing.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 40-53
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pH and time on hydrodynamic properties of dodecylamine
    Autorzy:
    Zhou, X.
    Tan, Y. H.
    Finch, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/109853.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pH
    dodecylamine
    gas holdup
    froth height
    Frother function
    Opis:
    Gas holdup and froth height in the presence of dodecylamine (DDA, pKa = 10.63) are reported at three pH values. The results revealed a strong time effect for DDA: stability was reached at pH 3; not at natural pH, for example, gas holdup declining to the water only value; and at pH 11, while stability was reached quickly gas holdup was now less than in water alone indicating coalescence. In the first two cases, the time effect is attributed to loss of amine from the system as molecular amine, observed at natural pH as precipitates on the column wall. An argument for precipitation at pH < pKa is presented. At pH 11, coalescence is attributed to the oily nature of the molecular amine present as colloidal aggregates. Noting a difference in literature steady state gas holdup data at natural pH, it is speculated that varying steady states can be reached that corresponds to different levels of amine loss.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1237-1244
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors influencing serum chemerin and kallistatin concentrations in patients with alcohol-induced liver cirrhosis
    Autorzy:
    Prystupa, A.
    Kiciński, P.
    Luchowska-Kocot, D.
    Sak, J.
    Prystupa, T.K.
    Tan, Y.-H.
    Panasiuk, L.
    Załuska, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082078.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    alcohol-induced liver cirrhosis
    chemerin
    kallistatin
    Opis:
    Introduction. In Poland, an increasing number of patients are hospitalized due to liver diseases. One of the common liver diseases is cirrhosis, which can be caused by alcohol, viral hepatitis, autoimmune processes and metabolic diseases. Materials and method. The study included 99 patients with alcoholic cirrhosis from the Lublin region of Eastern Poland. The control group consisted of 20 healthy individuals without liver disease who did not abuse alcohol. The concentrations of serum kallistatin and chemerin were determined using ELISA kits. Objective. The aim of the study is to evaluate serum levels of kallistatin and chemerin in patients with different stages of alcoholic liver cirrhosis. Results. The highest chemerin level was found in the control group – 182.6±80.4 ng/ml. In other stages of liver cirrhosis, the following levels were observed: 175.7±62.7 ng/ml in Child-Pugh stage A (Ch-P A), 150.2±59.7 ng/ml in Ch-P B and 110.3±73.6 ng/ml in Ch-P C. Significant differences in chemerin levels between controls and Ch-P C patients (p=0.01), as well as between the Ch-P A patients and Ch-P C patients (p=0.02), were demonstrated. The highest kallistatin level was demonstrated in the control group – 8.2±3.5 μg/ml. In other stages of liver cirrhosis, the following concentrations were found: 7.2±27 μg/ml in Ch-P A, 4.4±2.2 μg/ml in Ch-P B and 3.5±1.9 μg/ml in Ch-P C (Tab. 3). Statistically significant differences were observed between controls and Ch-P B patients (p<0.001), controls and Ch-P C patients (p<0.001), Ch-P A and Ch-P B patients (p=0.01), as well as Ch-P A and Ch-P C patients (<0.001). Conclusions. The levels of chemerin and kallistatin decrease with progression of liver damage during alcoholic liver cirrhosis. The impairment of its synthetic function leads to reductions in levels of the adipokines studied.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 143-147
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural network based identification of hysteresis in human meridian systems
    Autorzy:
    Tan, Y.
    Dong, R.
    Chen, H.
    He, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/330958.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    punkt akupunktury
    histereza
    sieć neuronowa
    tradycyjna medycyna chińska
    acupuncture point
    hysteresis
    identification
    neural network
    human meridian
    traditional Chinese medicine
    Opis:
    Developing a model based digital human meridian system is one of the interesting ways of understanding and improving acupuncture treatment, safety analysis for acupuncture operation, doctor training, or treatment scheme evaluation. In accomplishing this task, how to construct a proper model to describe the behavior of human meridian systems is one of the very important issues. From experiments, it has been found that the hysteresis phenomenon occurs in the relations between stimulation input and the corresponding response of meridian systems. Therefore, the modeling of hysteresis in a human meridian system is an unavoidable task for the construction of model based digital human meridian systems. As hysteresis is a nonsmooth, nonlinear and dynamic system with a multi-valued mapping, the conventional identification method is difficult to be employed to model its behavior directly. In this paper, a neural network based identification method of hysteresis occurring in human meridian systems is presented. In this modeling scheme, an expanded input space is constructed to transform the multi-valued mapping of hysteresis into a one-to-one mapping. For this purpose, a modified hysteretic operator is proposed to handle the extremum-missing problem. Then, based on the constructed expanded input space with the modified hysteretic operator, the so-called Extreme Learning Machine (ELM) neural network is utilized to model hysteresis inherent in human meridian systems. As hysteresis in meridian system is a dynamic system, a dynamic ELM neural network is developed. In the proposed dynamic ELMneural network, the output state of each hidden neuron is fed back to its own input to describe the dynamic behavior of hysteresis. The training of the recurrent ELM neural network is based on the least-squares algorithm with QR decomposition.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 3; 685-694
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential risk of Mesodinium rubrum bloom in the aquaculture area of Dapeng’ao cove, China: diurnal changes in the ciliate community structure in the surface water
    Autorzy:
    Liu, H.
    Song, X.
    Huang, L.
    Tan, Y.
    Zhong, Y.
    Huang, J.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/47949.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    potential risk
    Mesodinium rubrum
    bloom
    aquaculture area
    Dapeng'ao cove
    China
    diurnal change
    ciliate community
    surface water
    heavy rainfall
    water column
    stratification
    irradiance
    Opis:
    Diurnal changes in the structure of the ciliate community in surface waters were studied in the aquaculture area of Dapeng’ao cove, China. Two periods of heavy rainfall occurred during the study period, intensifying water column stratification and influencing the water’s properties. A total of 21 ciliate taxa from 15 genera were identified; the dominant species was Mesodinium rubrum. The maximum abundance of M. rubrum reached 3.92×104 indiv. dm−3, contributing 95.1% (mean value) to the total ciliate abundance. Diurnal changes in M. rubrum abundance were highly variable, the driving force probably being irradiance and food availability. The results suggest that M. rubrum may form blooms in aquaculture areas when there is a suitable physical regime with enriched nutrients, which is potentially harmful to the fish-farming industry.
    Źródło:
    Oceanologia; 2012, 54, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-parameter measurement under fiber bending based on directional resonance coupling in photonic crystal fibers
    Autorzy:
    Tan, C.
    Wang, Q.
    Ding, Y.
    Li, H.-W.
    Wang, M.
    Liu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/174320.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    fiber bending
    multi-parameter measurement
    photonic crystal fiber
    fiber sensing
    Opis:
    A multi-parameter sensor with enhanced sensitivity based on magnetic fluids infiltrated photonic crystal fiber is proposed. The sensing performances are investigated using the mode coupling theory and finite element method. Four symmetrical defective channels are assembled into the photonic crystal fiber to produce two resonant transmission dips λCV and λCH in vertical and horizontal directions, respectively. Each dip can be split into two relatively shallow dips (λCV1, λCV2 or λCH1, λCH2) when the photonic crystal fiber is bent. Interestingly, the values of (λCH2 – λCH1) and (λCV2 – λCV1) are associated with corresponding bend-curvature but almost unaffected by external temperature or magnetic field. On the contrary, the values of (λCH2 + λCH1)/2 and (λCV2 + λCV1)/2 are sensitive to temperature or magnetic field regardless of the bending condition. Based on above characteristics and the dependence of the magnetic fluids refractive index on temperature and magnetic field, the proposed sensor can measure not only the bend-curvature and bend-direction, but also the temperature and magnetic field.
    Źródło:
    Optica Applicata; 2018, 48, 3; 449-462
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Polymeric Binders on the RDX-based Explosive Response Character under Slow Cook-off Conditions
    Autorzy:
    Yan, X.
    Li, X. D.
    Zhang, Y. R.
    Liu, L.
    Zhang, X. M.
    Tan, Y. X.
    Wang, H.
    Wang, X. Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/358419.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    RDX-based explosive
    slow cook-off experiment
    binder content
    binder type
    Opis:
    Due to safety requirements, insensitive behaviour under slow thermal heating (cook-off) conditions is a desirable behaviour for today’s munitions. In this paper a cook-off device is designed to test two groups of RDX-based PBX explosives. In the first group the binder type was varied and in the second group the binder content of the RDX-based explosive was changed. Eleven samples were examined in order to evaluate the influence of four different binders and seven different binder contents on the shell deformation and the degree of the involved reaction. The test results showed that the degree of the reaction can be improved by changing the binder content, but not by the binder type. This phenomenon was explained by the thermal-conduction theory.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 2; 339-350
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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